drivers/ata/libata-core.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ata_sstatus_online
ata_link_next
ata_dev_next
ata_dev_phys_link
ata_force_cbl
ata_force_link_limits
ata_force_xfermask
ata_force_horkage
atapi_cmd_type
ata_tf_to_fis
ata_tf_from_fis
ata_rwcmd_protocol
ata_tf_read_block
ata_build_rw_tf
ata_pack_xfermask
ata_unpack_xfermask
ata_xfer_mask2mode
ata_xfer_mode2mask
ata_xfer_mode2shift
ata_mode_string
sata_spd_string
ata_dev_classify
ata_id_string
ata_id_c_string
ata_id_n_sectors
ata_tf_to_lba48
ata_tf_to_lba
ata_read_native_max_address
ata_set_max_sectors
ata_hpa_resize
ata_dump_id
ata_id_xfermask
ata_qc_complete_internal
ata_exec_internal_sg
ata_exec_internal
ata_pio_need_iordy
ata_pio_mask_no_iordy
ata_do_dev_read_id
ata_dev_read_id
ata_read_log_page
ata_log_supported
ata_identify_page_supported
ata_do_link_spd_horkage
ata_dev_knobble
ata_dev_config_ncq_send_recv
ata_dev_config_ncq_non_data
ata_dev_config_ncq_prio
ata_dev_config_ncq
ata_dev_config_sense_reporting
ata_dev_config_zac
ata_dev_config_trusted
ata_dev_configure
ata_cable_40wire
ata_cable_80wire
ata_cable_unknown
ata_cable_ignore
ata_cable_sata
ata_bus_probe
sata_print_link_status
ata_dev_pair
sata_down_spd_limit
__sata_set_spd_needed
sata_set_spd_needed
sata_set_spd
ata_timing_quantize
ata_timing_merge
ata_timing_find_mode
ata_timing_compute
ata_timing_cycle2mode
ata_down_xfermask_limit
ata_dev_set_mode
ata_do_set_mode
ata_wait_ready
ata_wait_after_reset
sata_link_debounce
sata_link_resume
sata_link_scr_lpm
ata_std_prereset
sata_link_hardreset
sata_std_hardreset
ata_std_postreset
ata_dev_same_device
ata_dev_reread_id
ata_dev_revalidate
ata_dev_blacklisted
ata_dma_blacklisted
ata_is_40wire
cable_is_40wire
ata_dev_xfermask
ata_dev_set_xfermode
ata_dev_set_feature
ata_dev_init_params
atapi_check_dma
ata_std_qc_defer
ata_noop_qc_prep
ata_sg_init
ata_sg_clean
ata_sg_setup
ata_sg_clean
ata_sg_setup
swap_buf_le16
ata_qc_new_init
ata_qc_free
__ata_qc_complete
fill_result_tf
ata_verify_xfer
ata_qc_complete
ata_qc_get_active
ata_qc_complete_multiple
ata_qc_issue
sata_scr_valid
sata_scr_read
sata_scr_write
sata_scr_write_flush
ata_phys_link_online
ata_phys_link_offline
ata_link_online
ata_link_offline
ata_port_request_pm
ata_port_suspend
ata_port_suspend_async
ata_port_pm_suspend
ata_port_pm_freeze
ata_port_pm_poweroff
ata_port_resume
ata_port_resume_async
ata_port_pm_resume
ata_port_runtime_idle
ata_port_runtime_suspend
ata_port_runtime_resume
ata_sas_port_suspend
ata_sas_port_resume
ata_host_suspend
ata_host_resume
ata_dev_init
ata_link_init
sata_link_init_spd
ata_port_alloc
ata_devres_release
ata_host_release
ata_host_get
ata_host_put
ata_host_alloc
ata_host_alloc_pinfo
ata_slave_link_init
ata_host_stop
ata_finalize_port_ops
ata_host_start
ata_host_init
__ata_port_probe
ata_port_probe
async_port_probe
ata_host_register
ata_host_activate
ata_port_detach
ata_host_detach
ata_pci_remove_one
ata_pci_shutdown_one
pci_test_config_bits
ata_pci_device_do_suspend
ata_pci_device_do_resume
ata_pci_device_suspend
ata_pci_device_resume
ata_platform_remove_one
ata_parse_force_one
ata_parse_force_param
ata_init
ata_exit
ata_ratelimit
ata_msleep
ata_wait_register
sata_lpm_ignore_phy_events
ata_dummy_qc_issue
ata_dummy_error_handler
ata_port_printk
ata_link_printk
ata_dev_printk
ata_print_version
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  libata-core.c - helper library for ATA
   4  *
   5  *  Maintained by:  Tejun Heo <tj@kernel.org>
   6  *                  Please ALWAYS copy linux-ide@vger.kernel.org
   7  *                  on emails.
   8  *
   9  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
  10  *  Copyright 2003-2004 Jeff Garzik
  11  *
  12  *  libata documentation is available via 'make {ps|pdf}docs',
  13  *  as Documentation/driver-api/libata.rst
  14  *
  15  *  Hardware documentation available from http://www.t13.org/ and
  16  *  http://www.sata-io.org/
  17  *
  18  *  Standards documents from:
  19  *      http://www.t13.org (ATA standards, PCI DMA IDE spec)
  20  *      http://www.t10.org (SCSI MMC - for ATAPI MMC)
  21  *      http://www.sata-io.org (SATA)
  22  *      http://www.compactflash.org (CF)
  23  *      http://www.qic.org (QIC157 - Tape and DSC)
  24  *      http://www.ce-ata.org (CE-ATA: not supported)
  25  */
  26 
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/mm.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/delay.h>
  36 #include <linux/timer.h>
  37 #include <linux/time.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/completion.h>
  40 #include <linux/suspend.h>
  41 #include <linux/workqueue.h>
  42 #include <linux/scatterlist.h>
  43 #include <linux/io.h>
  44 #include <linux/async.h>
  45 #include <linux/log2.h>
  46 #include <linux/slab.h>
  47 #include <linux/glob.h>
  48 #include <scsi/scsi.h>
  49 #include <scsi/scsi_cmnd.h>
  50 #include <scsi/scsi_host.h>
  51 #include <linux/libata.h>
  52 #include <asm/byteorder.h>
  53 #include <asm/unaligned.h>
  54 #include <linux/cdrom.h>
  55 #include <linux/ratelimit.h>
  56 #include <linux/leds.h>
  57 #include <linux/pm_runtime.h>
  58 #include <linux/platform_device.h>
  59 
  60 #define CREATE_TRACE_POINTS
  61 #include <trace/events/libata.h>
  62 
  63 #include "libata.h"
  64 #include "libata-transport.h"
  65 
  66 /* debounce timing parameters in msecs { interval, duration, timeout } */
  67 const unsigned long sata_deb_timing_normal[]            = {   5,  100, 2000 };
  68 const unsigned long sata_deb_timing_hotplug[]           = {  25,  500, 2000 };
  69 const unsigned long sata_deb_timing_long[]              = { 100, 2000, 5000 };
  70 
  71 const struct ata_port_operations ata_base_port_ops = {
  72         .prereset               = ata_std_prereset,
  73         .postreset              = ata_std_postreset,
  74         .error_handler          = ata_std_error_handler,
  75         .sched_eh               = ata_std_sched_eh,
  76         .end_eh                 = ata_std_end_eh,
  77 };
  78 
  79 const struct ata_port_operations sata_port_ops = {
  80         .inherits               = &ata_base_port_ops,
  81 
  82         .qc_defer               = ata_std_qc_defer,
  83         .hardreset              = sata_std_hardreset,
  84 };
  85 
  86 static unsigned int ata_dev_init_params(struct ata_device *dev,
  87                                         u16 heads, u16 sectors);
  88 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
  89 static void ata_dev_xfermask(struct ata_device *dev);
  90 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
  91 
  92 atomic_t ata_print_id = ATOMIC_INIT(0);
  93 
  94 struct ata_force_param {
  95         const char      *name;
  96         unsigned int    cbl;
  97         int             spd_limit;
  98         unsigned long   xfer_mask;
  99         unsigned int    horkage_on;
 100         unsigned int    horkage_off;
 101         unsigned int    lflags;
 102 };
 103 
 104 struct ata_force_ent {
 105         int                     port;
 106         int                     device;
 107         struct ata_force_param  param;
 108 };
 109 
 110 static struct ata_force_ent *ata_force_tbl;
 111 static int ata_force_tbl_size;
 112 
 113 static char ata_force_param_buf[PAGE_SIZE] __initdata;
 114 /* param_buf is thrown away after initialization, disallow read */
 115 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
 116 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/admin-guide/kernel-parameters.rst for details)");
 117 
 118 static int atapi_enabled = 1;
 119 module_param(atapi_enabled, int, 0444);
 120 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
 121 
 122 static int atapi_dmadir = 0;
 123 module_param(atapi_dmadir, int, 0444);
 124 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
 125 
 126 int atapi_passthru16 = 1;
 127 module_param(atapi_passthru16, int, 0444);
 128 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
 129 
 130 int libata_fua = 0;
 131 module_param_named(fua, libata_fua, int, 0444);
 132 MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
 133 
 134 static int ata_ignore_hpa;
 135 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
 136 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
 137 
 138 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
 139 module_param_named(dma, libata_dma_mask, int, 0444);
 140 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
 141 
 142 static int ata_probe_timeout;
 143 module_param(ata_probe_timeout, int, 0444);
 144 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
 145 
 146 int libata_noacpi = 0;
 147 module_param_named(noacpi, libata_noacpi, int, 0444);
 148 MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
 149 
 150 int libata_allow_tpm = 0;
 151 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
 152 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
 153 
 154 static int atapi_an;
 155 module_param(atapi_an, int, 0444);
 156 MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)");
 157 
 158 MODULE_AUTHOR("Jeff Garzik");
 159 MODULE_DESCRIPTION("Library module for ATA devices");
 160 MODULE_LICENSE("GPL");
 161 MODULE_VERSION(DRV_VERSION);
 162 
 163 
 164 static bool ata_sstatus_online(u32 sstatus)
 165 {
 166         return (sstatus & 0xf) == 0x3;
 167 }
 168 
 169 /**
 170  *      ata_link_next - link iteration helper
 171  *      @link: the previous link, NULL to start
 172  *      @ap: ATA port containing links to iterate
 173  *      @mode: iteration mode, one of ATA_LITER_*
 174  *
 175  *      LOCKING:
 176  *      Host lock or EH context.
 177  *
 178  *      RETURNS:
 179  *      Pointer to the next link.
 180  */
 181 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
 182                                enum ata_link_iter_mode mode)
 183 {
 184         BUG_ON(mode != ATA_LITER_EDGE &&
 185                mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);
 186 
 187         /* NULL link indicates start of iteration */
 188         if (!link)
 189                 switch (mode) {
 190                 case ATA_LITER_EDGE:
 191                 case ATA_LITER_PMP_FIRST:
 192                         if (sata_pmp_attached(ap))
 193                                 return ap->pmp_link;
 194                         /* fall through */
 195                 case ATA_LITER_HOST_FIRST:
 196                         return &ap->link;
 197                 }
 198 
 199         /* we just iterated over the host link, what's next? */
 200         if (link == &ap->link)
 201                 switch (mode) {
 202                 case ATA_LITER_HOST_FIRST:
 203                         if (sata_pmp_attached(ap))
 204                                 return ap->pmp_link;
 205                         /* fall through */
 206                 case ATA_LITER_PMP_FIRST:
 207                         if (unlikely(ap->slave_link))
 208                                 return ap->slave_link;
 209                         /* fall through */
 210                 case ATA_LITER_EDGE:
 211                         return NULL;
 212                 }
 213 
 214         /* slave_link excludes PMP */
 215         if (unlikely(link == ap->slave_link))
 216                 return NULL;
 217 
 218         /* we were over a PMP link */
 219         if (++link < ap->pmp_link + ap->nr_pmp_links)
 220                 return link;
 221 
 222         if (mode == ATA_LITER_PMP_FIRST)
 223                 return &ap->link;
 224 
 225         return NULL;
 226 }
 227 
 228 /**
 229  *      ata_dev_next - device iteration helper
 230  *      @dev: the previous device, NULL to start
 231  *      @link: ATA link containing devices to iterate
 232  *      @mode: iteration mode, one of ATA_DITER_*
 233  *
 234  *      LOCKING:
 235  *      Host lock or EH context.
 236  *
 237  *      RETURNS:
 238  *      Pointer to the next device.
 239  */
 240 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
 241                                 enum ata_dev_iter_mode mode)
 242 {
 243         BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
 244                mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);
 245 
 246         /* NULL dev indicates start of iteration */
 247         if (!dev)
 248                 switch (mode) {
 249                 case ATA_DITER_ENABLED:
 250                 case ATA_DITER_ALL:
 251                         dev = link->device;
 252                         goto check;
 253                 case ATA_DITER_ENABLED_REVERSE:
 254                 case ATA_DITER_ALL_REVERSE:
 255                         dev = link->device + ata_link_max_devices(link) - 1;
 256                         goto check;
 257                 }
 258 
 259  next:
 260         /* move to the next one */
 261         switch (mode) {
 262         case ATA_DITER_ENABLED:
 263         case ATA_DITER_ALL:
 264                 if (++dev < link->device + ata_link_max_devices(link))
 265                         goto check;
 266                 return NULL;
 267         case ATA_DITER_ENABLED_REVERSE:
 268         case ATA_DITER_ALL_REVERSE:
 269                 if (--dev >= link->device)
 270                         goto check;
 271                 return NULL;
 272         }
 273 
 274  check:
 275         if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
 276             !ata_dev_enabled(dev))
 277                 goto next;
 278         return dev;
 279 }
 280 
 281 /**
 282  *      ata_dev_phys_link - find physical link for a device
 283  *      @dev: ATA device to look up physical link for
 284  *
 285  *      Look up physical link which @dev is attached to.  Note that
 286  *      this is different from @dev->link only when @dev is on slave
 287  *      link.  For all other cases, it's the same as @dev->link.
 288  *
 289  *      LOCKING:
 290  *      Don't care.
 291  *
 292  *      RETURNS:
 293  *      Pointer to the found physical link.
 294  */
 295 struct ata_link *ata_dev_phys_link(struct ata_device *dev)
 296 {
 297         struct ata_port *ap = dev->link->ap;
 298 
 299         if (!ap->slave_link)
 300                 return dev->link;
 301         if (!dev->devno)
 302                 return &ap->link;
 303         return ap->slave_link;
 304 }
 305 
 306 /**
 307  *      ata_force_cbl - force cable type according to libata.force
 308  *      @ap: ATA port of interest
 309  *
 310  *      Force cable type according to libata.force and whine about it.
 311  *      The last entry which has matching port number is used, so it
 312  *      can be specified as part of device force parameters.  For
 313  *      example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
 314  *      same effect.
 315  *
 316  *      LOCKING:
 317  *      EH context.
 318  */
 319 void ata_force_cbl(struct ata_port *ap)
 320 {
 321         int i;
 322 
 323         for (i = ata_force_tbl_size - 1; i >= 0; i--) {
 324                 const struct ata_force_ent *fe = &ata_force_tbl[i];
 325 
 326                 if (fe->port != -1 && fe->port != ap->print_id)
 327                         continue;
 328 
 329                 if (fe->param.cbl == ATA_CBL_NONE)
 330                         continue;
 331 
 332                 ap->cbl = fe->param.cbl;
 333                 ata_port_notice(ap, "FORCE: cable set to %s\n", fe->param.name);
 334                 return;
 335         }
 336 }
 337 
 338 /**
 339  *      ata_force_link_limits - force link limits according to libata.force
 340  *      @link: ATA link of interest
 341  *
 342  *      Force link flags and SATA spd limit according to libata.force
 343  *      and whine about it.  When only the port part is specified
 344  *      (e.g. 1:), the limit applies to all links connected to both
 345  *      the host link and all fan-out ports connected via PMP.  If the
 346  *      device part is specified as 0 (e.g. 1.00:), it specifies the
 347  *      first fan-out link not the host link.  Device number 15 always
 348  *      points to the host link whether PMP is attached or not.  If the
 349  *      controller has slave link, device number 16 points to it.
 350  *
 351  *      LOCKING:
 352  *      EH context.
 353  */
 354 static void ata_force_link_limits(struct ata_link *link)
 355 {
 356         bool did_spd = false;
 357         int linkno = link->pmp;
 358         int i;
 359 
 360         if (ata_is_host_link(link))
 361                 linkno += 15;
 362 
 363         for (i = ata_force_tbl_size - 1; i >= 0; i--) {
 364                 const struct ata_force_ent *fe = &ata_force_tbl[i];
 365 
 366                 if (fe->port != -1 && fe->port != link->ap->print_id)
 367                         continue;
 368 
 369                 if (fe->device != -1 && fe->device != linkno)
 370                         continue;
 371 
 372                 /* only honor the first spd limit */
 373                 if (!did_spd && fe->param.spd_limit) {
 374                         link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
 375                         ata_link_notice(link, "FORCE: PHY spd limit set to %s\n",
 376                                         fe->param.name);
 377                         did_spd = true;
 378                 }
 379 
 380                 /* let lflags stack */
 381                 if (fe->param.lflags) {
 382                         link->flags |= fe->param.lflags;
 383                         ata_link_notice(link,
 384                                         "FORCE: link flag 0x%x forced -> 0x%x\n",
 385                                         fe->param.lflags, link->flags);
 386                 }
 387         }
 388 }
 389 
 390 /**
 391  *      ata_force_xfermask - force xfermask according to libata.force
 392  *      @dev: ATA device of interest
 393  *
 394  *      Force xfer_mask according to libata.force and whine about it.
 395  *      For consistency with link selection, device number 15 selects
 396  *      the first device connected to the host link.
 397  *
 398  *      LOCKING:
 399  *      EH context.
 400  */
 401 static void ata_force_xfermask(struct ata_device *dev)
 402 {
 403         int devno = dev->link->pmp + dev->devno;
 404         int alt_devno = devno;
 405         int i;
 406 
 407         /* allow n.15/16 for devices attached to host port */
 408         if (ata_is_host_link(dev->link))
 409                 alt_devno += 15;
 410 
 411         for (i = ata_force_tbl_size - 1; i >= 0; i--) {
 412                 const struct ata_force_ent *fe = &ata_force_tbl[i];
 413                 unsigned long pio_mask, mwdma_mask, udma_mask;
 414 
 415                 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
 416                         continue;
 417 
 418                 if (fe->device != -1 && fe->device != devno &&
 419                     fe->device != alt_devno)
 420                         continue;
 421 
 422                 if (!fe->param.xfer_mask)
 423                         continue;
 424 
 425                 ata_unpack_xfermask(fe->param.xfer_mask,
 426                                     &pio_mask, &mwdma_mask, &udma_mask);
 427                 if (udma_mask)
 428                         dev->udma_mask = udma_mask;
 429                 else if (mwdma_mask) {
 430                         dev->udma_mask = 0;
 431                         dev->mwdma_mask = mwdma_mask;
 432                 } else {
 433                         dev->udma_mask = 0;
 434                         dev->mwdma_mask = 0;
 435                         dev->pio_mask = pio_mask;
 436                 }
 437 
 438                 ata_dev_notice(dev, "FORCE: xfer_mask set to %s\n",
 439                                fe->param.name);
 440                 return;
 441         }
 442 }
 443 
 444 /**
 445  *      ata_force_horkage - force horkage according to libata.force
 446  *      @dev: ATA device of interest
 447  *
 448  *      Force horkage according to libata.force and whine about it.
 449  *      For consistency with link selection, device number 15 selects
 450  *      the first device connected to the host link.
 451  *
 452  *      LOCKING:
 453  *      EH context.
 454  */
 455 static void ata_force_horkage(struct ata_device *dev)
 456 {
 457         int devno = dev->link->pmp + dev->devno;
 458         int alt_devno = devno;
 459         int i;
 460 
 461         /* allow n.15/16 for devices attached to host port */
 462         if (ata_is_host_link(dev->link))
 463                 alt_devno += 15;
 464 
 465         for (i = 0; i < ata_force_tbl_size; i++) {
 466                 const struct ata_force_ent *fe = &ata_force_tbl[i];
 467 
 468                 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
 469                         continue;
 470 
 471                 if (fe->device != -1 && fe->device != devno &&
 472                     fe->device != alt_devno)
 473                         continue;
 474 
 475                 if (!(~dev->horkage & fe->param.horkage_on) &&
 476                     !(dev->horkage & fe->param.horkage_off))
 477                         continue;
 478 
 479                 dev->horkage |= fe->param.horkage_on;
 480                 dev->horkage &= ~fe->param.horkage_off;
 481 
 482                 ata_dev_notice(dev, "FORCE: horkage modified (%s)\n",
 483                                fe->param.name);
 484         }
 485 }
 486 
 487 /**
 488  *      atapi_cmd_type - Determine ATAPI command type from SCSI opcode
 489  *      @opcode: SCSI opcode
 490  *
 491  *      Determine ATAPI command type from @opcode.
 492  *
 493  *      LOCKING:
 494  *      None.
 495  *
 496  *      RETURNS:
 497  *      ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
 498  */
 499 int atapi_cmd_type(u8 opcode)
 500 {
 501         switch (opcode) {
 502         case GPCMD_READ_10:
 503         case GPCMD_READ_12:
 504                 return ATAPI_READ;
 505 
 506         case GPCMD_WRITE_10:
 507         case GPCMD_WRITE_12:
 508         case GPCMD_WRITE_AND_VERIFY_10:
 509                 return ATAPI_WRITE;
 510 
 511         case GPCMD_READ_CD:
 512         case GPCMD_READ_CD_MSF:
 513                 return ATAPI_READ_CD;
 514 
 515         case ATA_16:
 516         case ATA_12:
 517                 if (atapi_passthru16)
 518                         return ATAPI_PASS_THRU;
 519                 /* fall thru */
 520         default:
 521                 return ATAPI_MISC;
 522         }
 523 }
 524 
 525 /**
 526  *      ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 527  *      @tf: Taskfile to convert
 528  *      @pmp: Port multiplier port
 529  *      @is_cmd: This FIS is for command
 530  *      @fis: Buffer into which data will output
 531  *
 532  *      Converts a standard ATA taskfile to a Serial ATA
 533  *      FIS structure (Register - Host to Device).
 534  *
 535  *      LOCKING:
 536  *      Inherited from caller.
 537  */
 538 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
 539 {
 540         fis[0] = 0x27;                  /* Register - Host to Device FIS */
 541         fis[1] = pmp & 0xf;             /* Port multiplier number*/
 542         if (is_cmd)
 543                 fis[1] |= (1 << 7);     /* bit 7 indicates Command FIS */
 544 
 545         fis[2] = tf->command;
 546         fis[3] = tf->feature;
 547 
 548         fis[4] = tf->lbal;
 549         fis[5] = tf->lbam;
 550         fis[6] = tf->lbah;
 551         fis[7] = tf->device;
 552 
 553         fis[8] = tf->hob_lbal;
 554         fis[9] = tf->hob_lbam;
 555         fis[10] = tf->hob_lbah;
 556         fis[11] = tf->hob_feature;
 557 
 558         fis[12] = tf->nsect;
 559         fis[13] = tf->hob_nsect;
 560         fis[14] = 0;
 561         fis[15] = tf->ctl;
 562 
 563         fis[16] = tf->auxiliary & 0xff;
 564         fis[17] = (tf->auxiliary >> 8) & 0xff;
 565         fis[18] = (tf->auxiliary >> 16) & 0xff;
 566         fis[19] = (tf->auxiliary >> 24) & 0xff;
 567 }
 568 
 569 /**
 570  *      ata_tf_from_fis - Convert SATA FIS to ATA taskfile
 571  *      @fis: Buffer from which data will be input
 572  *      @tf: Taskfile to output
 573  *
 574  *      Converts a serial ATA FIS structure to a standard ATA taskfile.
 575  *
 576  *      LOCKING:
 577  *      Inherited from caller.
 578  */
 579 
 580 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
 581 {
 582         tf->command     = fis[2];       /* status */
 583         tf->feature     = fis[3];       /* error */
 584 
 585         tf->lbal        = fis[4];
 586         tf->lbam        = fis[5];
 587         tf->lbah        = fis[6];
 588         tf->device      = fis[7];
 589 
 590         tf->hob_lbal    = fis[8];
 591         tf->hob_lbam    = fis[9];
 592         tf->hob_lbah    = fis[10];
 593 
 594         tf->nsect       = fis[12];
 595         tf->hob_nsect   = fis[13];
 596 }
 597 
 598 static const u8 ata_rw_cmds[] = {
 599         /* pio multi */
 600         ATA_CMD_READ_MULTI,
 601         ATA_CMD_WRITE_MULTI,
 602         ATA_CMD_READ_MULTI_EXT,
 603         ATA_CMD_WRITE_MULTI_EXT,
 604         0,
 605         0,
 606         0,
 607         ATA_CMD_WRITE_MULTI_FUA_EXT,
 608         /* pio */
 609         ATA_CMD_PIO_READ,
 610         ATA_CMD_PIO_WRITE,
 611         ATA_CMD_PIO_READ_EXT,
 612         ATA_CMD_PIO_WRITE_EXT,
 613         0,
 614         0,
 615         0,
 616         0,
 617         /* dma */
 618         ATA_CMD_READ,
 619         ATA_CMD_WRITE,
 620         ATA_CMD_READ_EXT,
 621         ATA_CMD_WRITE_EXT,
 622         0,
 623         0,
 624         0,
 625         ATA_CMD_WRITE_FUA_EXT
 626 };
 627 
 628 /**
 629  *      ata_rwcmd_protocol - set taskfile r/w commands and protocol
 630  *      @tf: command to examine and configure
 631  *      @dev: device tf belongs to
 632  *
 633  *      Examine the device configuration and tf->flags to calculate
 634  *      the proper read/write commands and protocol to use.
 635  *
 636  *      LOCKING:
 637  *      caller.
 638  */
 639 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
 640 {
 641         u8 cmd;
 642 
 643         int index, fua, lba48, write;
 644 
 645         fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
 646         lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
 647         write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
 648 
 649         if (dev->flags & ATA_DFLAG_PIO) {
 650                 tf->protocol = ATA_PROT_PIO;
 651                 index = dev->multi_count ? 0 : 8;
 652         } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
 653                 /* Unable to use DMA due to host limitation */
 654                 tf->protocol = ATA_PROT_PIO;
 655                 index = dev->multi_count ? 0 : 8;
 656         } else {
 657                 tf->protocol = ATA_PROT_DMA;
 658                 index = 16;
 659         }
 660 
 661         cmd = ata_rw_cmds[index + fua + lba48 + write];
 662         if (cmd) {
 663                 tf->command = cmd;
 664                 return 0;
 665         }
 666         return -1;
 667 }
 668 
 669 /**
 670  *      ata_tf_read_block - Read block address from ATA taskfile
 671  *      @tf: ATA taskfile of interest
 672  *      @dev: ATA device @tf belongs to
 673  *
 674  *      LOCKING:
 675  *      None.
 676  *
 677  *      Read block address from @tf.  This function can handle all
 678  *      three address formats - LBA, LBA48 and CHS.  tf->protocol and
 679  *      flags select the address format to use.
 680  *
 681  *      RETURNS:
 682  *      Block address read from @tf.
 683  */
 684 u64 ata_tf_read_block(const struct ata_taskfile *tf, struct ata_device *dev)
 685 {
 686         u64 block = 0;
 687 
 688         if (tf->flags & ATA_TFLAG_LBA) {
 689                 if (tf->flags & ATA_TFLAG_LBA48) {
 690                         block |= (u64)tf->hob_lbah << 40;
 691                         block |= (u64)tf->hob_lbam << 32;
 692                         block |= (u64)tf->hob_lbal << 24;
 693                 } else
 694                         block |= (tf->device & 0xf) << 24;
 695 
 696                 block |= tf->lbah << 16;
 697                 block |= tf->lbam << 8;
 698                 block |= tf->lbal;
 699         } else {
 700                 u32 cyl, head, sect;
 701 
 702                 cyl = tf->lbam | (tf->lbah << 8);
 703                 head = tf->device & 0xf;
 704                 sect = tf->lbal;
 705 
 706                 if (!sect) {
 707                         ata_dev_warn(dev,
 708                                      "device reported invalid CHS sector 0\n");
 709                         return U64_MAX;
 710                 }
 711 
 712                 block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
 713         }
 714 
 715         return block;
 716 }
 717 
 718 /**
 719  *      ata_build_rw_tf - Build ATA taskfile for given read/write request
 720  *      @tf: Target ATA taskfile
 721  *      @dev: ATA device @tf belongs to
 722  *      @block: Block address
 723  *      @n_block: Number of blocks
 724  *      @tf_flags: RW/FUA etc...
 725  *      @tag: tag
 726  *      @class: IO priority class
 727  *
 728  *      LOCKING:
 729  *      None.
 730  *
 731  *      Build ATA taskfile @tf for read/write request described by
 732  *      @block, @n_block, @tf_flags and @tag on @dev.
 733  *
 734  *      RETURNS:
 735  *
 736  *      0 on success, -ERANGE if the request is too large for @dev,
 737  *      -EINVAL if the request is invalid.
 738  */
 739 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
 740                     u64 block, u32 n_block, unsigned int tf_flags,
 741                     unsigned int tag, int class)
 742 {
 743         tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
 744         tf->flags |= tf_flags;
 745 
 746         if (ata_ncq_enabled(dev) && !ata_tag_internal(tag)) {
 747                 /* yay, NCQ */
 748                 if (!lba_48_ok(block, n_block))
 749                         return -ERANGE;
 750 
 751                 tf->protocol = ATA_PROT_NCQ;
 752                 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
 753 
 754                 if (tf->flags & ATA_TFLAG_WRITE)
 755                         tf->command = ATA_CMD_FPDMA_WRITE;
 756                 else
 757                         tf->command = ATA_CMD_FPDMA_READ;
 758 
 759                 tf->nsect = tag << 3;
 760                 tf->hob_feature = (n_block >> 8) & 0xff;
 761                 tf->feature = n_block & 0xff;
 762 
 763                 tf->hob_lbah = (block >> 40) & 0xff;
 764                 tf->hob_lbam = (block >> 32) & 0xff;
 765                 tf->hob_lbal = (block >> 24) & 0xff;
 766                 tf->lbah = (block >> 16) & 0xff;
 767                 tf->lbam = (block >> 8) & 0xff;
 768                 tf->lbal = block & 0xff;
 769 
 770                 tf->device = ATA_LBA;
 771                 if (tf->flags & ATA_TFLAG_FUA)
 772                         tf->device |= 1 << 7;
 773 
 774                 if (dev->flags & ATA_DFLAG_NCQ_PRIO) {
 775                         if (class == IOPRIO_CLASS_RT)
 776                                 tf->hob_nsect |= ATA_PRIO_HIGH <<
 777                                                  ATA_SHIFT_PRIO;
 778                 }
 779         } else if (dev->flags & ATA_DFLAG_LBA) {
 780                 tf->flags |= ATA_TFLAG_LBA;
 781 
 782                 if (lba_28_ok(block, n_block)) {
 783                         /* use LBA28 */
 784                         tf->device |= (block >> 24) & 0xf;
 785                 } else if (lba_48_ok(block, n_block)) {
 786                         if (!(dev->flags & ATA_DFLAG_LBA48))
 787                                 return -ERANGE;
 788 
 789                         /* use LBA48 */
 790                         tf->flags |= ATA_TFLAG_LBA48;
 791 
 792                         tf->hob_nsect = (n_block >> 8) & 0xff;
 793 
 794                         tf->hob_lbah = (block >> 40) & 0xff;
 795                         tf->hob_lbam = (block >> 32) & 0xff;
 796                         tf->hob_lbal = (block >> 24) & 0xff;
 797                 } else
 798                         /* request too large even for LBA48 */
 799                         return -ERANGE;
 800 
 801                 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
 802                         return -EINVAL;
 803 
 804                 tf->nsect = n_block & 0xff;
 805 
 806                 tf->lbah = (block >> 16) & 0xff;
 807                 tf->lbam = (block >> 8) & 0xff;
 808                 tf->lbal = block & 0xff;
 809 
 810                 tf->device |= ATA_LBA;
 811         } else {
 812                 /* CHS */
 813                 u32 sect, head, cyl, track;
 814 
 815                 /* The request -may- be too large for CHS addressing. */
 816                 if (!lba_28_ok(block, n_block))
 817                         return -ERANGE;
 818 
 819                 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
 820                         return -EINVAL;
 821 
 822                 /* Convert LBA to CHS */
 823                 track = (u32)block / dev->sectors;
 824                 cyl   = track / dev->heads;
 825                 head  = track % dev->heads;
 826                 sect  = (u32)block % dev->sectors + 1;
 827 
 828                 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
 829                         (u32)block, track, cyl, head, sect);
 830 
 831                 /* Check whether the converted CHS can fit.
 832                    Cylinder: 0-65535
 833                    Head: 0-15
 834                    Sector: 1-255*/
 835                 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
 836                         return -ERANGE;
 837 
 838                 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
 839                 tf->lbal = sect;
 840                 tf->lbam = cyl;
 841                 tf->lbah = cyl >> 8;
 842                 tf->device |= head;
 843         }
 844 
 845         return 0;
 846 }
 847 
 848 /**
 849  *      ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 850  *      @pio_mask: pio_mask
 851  *      @mwdma_mask: mwdma_mask
 852  *      @udma_mask: udma_mask
 853  *
 854  *      Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 855  *      unsigned int xfer_mask.
 856  *
 857  *      LOCKING:
 858  *      None.
 859  *
 860  *      RETURNS:
 861  *      Packed xfer_mask.
 862  */
 863 unsigned long ata_pack_xfermask(unsigned long pio_mask,
 864                                 unsigned long mwdma_mask,
 865                                 unsigned long udma_mask)
 866 {
 867         return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
 868                 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
 869                 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
 870 }
 871 
 872 /**
 873  *      ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 874  *      @xfer_mask: xfer_mask to unpack
 875  *      @pio_mask: resulting pio_mask
 876  *      @mwdma_mask: resulting mwdma_mask
 877  *      @udma_mask: resulting udma_mask
 878  *
 879  *      Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 880  *      Any NULL destination masks will be ignored.
 881  */
 882 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
 883                          unsigned long *mwdma_mask, unsigned long *udma_mask)
 884 {
 885         if (pio_mask)
 886                 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
 887         if (mwdma_mask)
 888                 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
 889         if (udma_mask)
 890                 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
 891 }
 892 
 893 static const struct ata_xfer_ent {
 894         int shift, bits;
 895         u8 base;
 896 } ata_xfer_tbl[] = {
 897         { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
 898         { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
 899         { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
 900         { -1, },
 901 };
 902 
 903 /**
 904  *      ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 905  *      @xfer_mask: xfer_mask of interest
 906  *
 907  *      Return matching XFER_* value for @xfer_mask.  Only the highest
 908  *      bit of @xfer_mask is considered.
 909  *
 910  *      LOCKING:
 911  *      None.
 912  *
 913  *      RETURNS:
 914  *      Matching XFER_* value, 0xff if no match found.
 915  */
 916 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
 917 {
 918         int highbit = fls(xfer_mask) - 1;
 919         const struct ata_xfer_ent *ent;
 920 
 921         for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
 922                 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
 923                         return ent->base + highbit - ent->shift;
 924         return 0xff;
 925 }
 926 
 927 /**
 928  *      ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 929  *      @xfer_mode: XFER_* of interest
 930  *
 931  *      Return matching xfer_mask for @xfer_mode.
 932  *
 933  *      LOCKING:
 934  *      None.
 935  *
 936  *      RETURNS:
 937  *      Matching xfer_mask, 0 if no match found.
 938  */
 939 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
 940 {
 941         const struct ata_xfer_ent *ent;
 942 
 943         for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
 944                 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
 945                         return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
 946                                 & ~((1 << ent->shift) - 1);
 947         return 0;
 948 }
 949 
 950 /**
 951  *      ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 952  *      @xfer_mode: XFER_* of interest
 953  *
 954  *      Return matching xfer_shift for @xfer_mode.
 955  *
 956  *      LOCKING:
 957  *      None.
 958  *
 959  *      RETURNS:
 960  *      Matching xfer_shift, -1 if no match found.
 961  */
 962 int ata_xfer_mode2shift(unsigned long xfer_mode)
 963 {
 964         const struct ata_xfer_ent *ent;
 965 
 966         for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
 967                 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
 968                         return ent->shift;
 969         return -1;
 970 }
 971 
 972 /**
 973  *      ata_mode_string - convert xfer_mask to string
 974  *      @xfer_mask: mask of bits supported; only highest bit counts.
 975  *
 976  *      Determine string which represents the highest speed
 977  *      (highest bit in @modemask).
 978  *
 979  *      LOCKING:
 980  *      None.
 981  *
 982  *      RETURNS:
 983  *      Constant C string representing highest speed listed in
 984  *      @mode_mask, or the constant C string "<n/a>".
 985  */
 986 const char *ata_mode_string(unsigned long xfer_mask)
 987 {
 988         static const char * const xfer_mode_str[] = {
 989                 "PIO0",
 990                 "PIO1",
 991                 "PIO2",
 992                 "PIO3",
 993                 "PIO4",
 994                 "PIO5",
 995                 "PIO6",
 996                 "MWDMA0",
 997                 "MWDMA1",
 998                 "MWDMA2",
 999                 "MWDMA3",
1000                 "MWDMA4",
1001                 "UDMA/16",
1002                 "UDMA/25",
1003                 "UDMA/33",
1004                 "UDMA/44",
1005                 "UDMA/66",
1006                 "UDMA/100",
1007                 "UDMA/133",
1008                 "UDMA7",
1009         };
1010         int highbit;
1011 
1012         highbit = fls(xfer_mask) - 1;
1013         if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
1014                 return xfer_mode_str[highbit];
1015         return "<n/a>";
1016 }
1017 
1018 const char *sata_spd_string(unsigned int spd)
1019 {
1020         static const char * const spd_str[] = {
1021                 "1.5 Gbps",
1022                 "3.0 Gbps",
1023                 "6.0 Gbps",
1024         };
1025 
1026         if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
1027                 return "<unknown>";
1028         return spd_str[spd - 1];
1029 }
1030 
1031 /**
1032  *      ata_dev_classify - determine device type based on ATA-spec signature
1033  *      @tf: ATA taskfile register set for device to be identified
1034  *
1035  *      Determine from taskfile register contents whether a device is
1036  *      ATA or ATAPI, as per "Signature and persistence" section
1037  *      of ATA/PI spec (volume 1, sect 5.14).
1038  *
1039  *      LOCKING:
1040  *      None.
1041  *
1042  *      RETURNS:
1043  *      Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP,
1044  *      %ATA_DEV_ZAC, or %ATA_DEV_UNKNOWN the event of failure.
1045  */
1046 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1047 {
1048         /* Apple's open source Darwin code hints that some devices only
1049          * put a proper signature into the LBA mid/high registers,
1050          * So, we only check those.  It's sufficient for uniqueness.
1051          *
1052          * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1053          * signatures for ATA and ATAPI devices attached on SerialATA,
1054          * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
1055          * spec has never mentioned about using different signatures
1056          * for ATA/ATAPI devices.  Then, Serial ATA II: Port
1057          * Multiplier specification began to use 0x69/0x96 to identify
1058          * port multpliers and 0x3c/0xc3 to identify SEMB device.
1059          * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1060          * 0x69/0x96 shortly and described them as reserved for
1061          * SerialATA.
1062          *
1063          * We follow the current spec and consider that 0x69/0x96
1064          * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1065          * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
1066          * SEMB signature.  This is worked around in
1067          * ata_dev_read_id().
1068          */
1069         if ((tf->lbam == 0) && (tf->lbah == 0)) {
1070                 DPRINTK("found ATA device by sig\n");
1071                 return ATA_DEV_ATA;
1072         }
1073 
1074         if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1075                 DPRINTK("found ATAPI device by sig\n");
1076                 return ATA_DEV_ATAPI;
1077         }
1078 
1079         if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1080                 DPRINTK("found PMP device by sig\n");
1081                 return ATA_DEV_PMP;
1082         }
1083 
1084         if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1085                 DPRINTK("found SEMB device by sig (could be ATA device)\n");
1086                 return ATA_DEV_SEMB;
1087         }
1088 
1089         if ((tf->lbam == 0xcd) && (tf->lbah == 0xab)) {
1090                 DPRINTK("found ZAC device by sig\n");
1091                 return ATA_DEV_ZAC;
1092         }
1093 
1094         DPRINTK("unknown device\n");
1095         return ATA_DEV_UNKNOWN;
1096 }
1097 
1098 /**
1099  *      ata_id_string - Convert IDENTIFY DEVICE page into string
1100  *      @id: IDENTIFY DEVICE results we will examine
1101  *      @s: string into which data is output
1102  *      @ofs: offset into identify device page
1103  *      @len: length of string to return. must be an even number.
1104  *
1105  *      The strings in the IDENTIFY DEVICE page are broken up into
1106  *      16-bit chunks.  Run through the string, and output each
1107  *      8-bit chunk linearly, regardless of platform.
1108  *
1109  *      LOCKING:
1110  *      caller.
1111  */
1112 
1113 void ata_id_string(const u16 *id, unsigned char *s,
1114                    unsigned int ofs, unsigned int len)
1115 {
1116         unsigned int c;
1117 
1118         BUG_ON(len & 1);
1119 
1120         while (len > 0) {
1121                 c = id[ofs] >> 8;
1122                 *s = c;
1123                 s++;
1124 
1125                 c = id[ofs] & 0xff;
1126                 *s = c;
1127                 s++;
1128 
1129                 ofs++;
1130                 len -= 2;
1131         }
1132 }
1133 
1134 /**
1135  *      ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1136  *      @id: IDENTIFY DEVICE results we will examine
1137  *      @s: string into which data is output
1138  *      @ofs: offset into identify device page
1139  *      @len: length of string to return. must be an odd number.
1140  *
1141  *      This function is identical to ata_id_string except that it
1142  *      trims trailing spaces and terminates the resulting string with
1143  *      null.  @len must be actual maximum length (even number) + 1.
1144  *
1145  *      LOCKING:
1146  *      caller.
1147  */
1148 void ata_id_c_string(const u16 *id, unsigned char *s,
1149                      unsigned int ofs, unsigned int len)
1150 {
1151         unsigned char *p;
1152 
1153         ata_id_string(id, s, ofs, len - 1);
1154 
1155         p = s + strnlen(s, len - 1);
1156         while (p > s && p[-1] == ' ')
1157                 p--;
1158         *p = '\0';
1159 }
1160 
1161 static u64 ata_id_n_sectors(const u16 *id)
1162 {
1163         if (ata_id_has_lba(id)) {
1164                 if (ata_id_has_lba48(id))
1165                         return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1166                 else
1167                         return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1168         } else {
1169                 if (ata_id_current_chs_valid(id))
1170                         return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
1171                                id[ATA_ID_CUR_SECTORS];
1172                 else
1173                         return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
1174                                id[ATA_ID_SECTORS];
1175         }
1176 }
1177 
1178 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1179 {
1180         u64 sectors = 0;
1181 
1182         sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1183         sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1184         sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
1185         sectors |= (tf->lbah & 0xff) << 16;
1186         sectors |= (tf->lbam & 0xff) << 8;
1187         sectors |= (tf->lbal & 0xff);
1188 
1189         return sectors;
1190 }
1191 
1192 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1193 {
1194         u64 sectors = 0;
1195 
1196         sectors |= (tf->device & 0x0f) << 24;
1197         sectors |= (tf->lbah & 0xff) << 16;
1198         sectors |= (tf->lbam & 0xff) << 8;
1199         sectors |= (tf->lbal & 0xff);
1200 
1201         return sectors;
1202 }
1203 
1204 /**
1205  *      ata_read_native_max_address - Read native max address
1206  *      @dev: target device
1207  *      @max_sectors: out parameter for the result native max address
1208  *
1209  *      Perform an LBA48 or LBA28 native size query upon the device in
1210  *      question.
1211  *
1212  *      RETURNS:
1213  *      0 on success, -EACCES if command is aborted by the drive.
1214  *      -EIO on other errors.
1215  */
1216 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1217 {
1218         unsigned int err_mask;
1219         struct ata_taskfile tf;
1220         int lba48 = ata_id_has_lba48(dev->id);
1221 
1222         ata_tf_init(dev, &tf);
1223 
1224         /* always clear all address registers */
1225         tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1226 
1227         if (lba48) {
1228                 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1229                 tf.flags |= ATA_TFLAG_LBA48;
1230         } else
1231                 tf.command = ATA_CMD_READ_NATIVE_MAX;
1232 
1233         tf.protocol = ATA_PROT_NODATA;
1234         tf.device |= ATA_LBA;
1235 
1236         err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1237         if (err_mask) {
1238                 ata_dev_warn(dev,
1239                              "failed to read native max address (err_mask=0x%x)\n",
1240                              err_mask);
1241                 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1242                         return -EACCES;
1243                 return -EIO;
1244         }
1245 
1246         if (lba48)
1247                 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1248         else
1249                 *max_sectors = ata_tf_to_lba(&tf) + 1;
1250         if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1251                 (*max_sectors)--;
1252         return 0;
1253 }
1254 
1255 /**
1256  *      ata_set_max_sectors - Set max sectors
1257  *      @dev: target device
1258  *      @new_sectors: new max sectors value to set for the device
1259  *
1260  *      Set max sectors of @dev to @new_sectors.
1261  *
1262  *      RETURNS:
1263  *      0 on success, -EACCES if command is aborted or denied (due to
1264  *      previous non-volatile SET_MAX) by the drive.  -EIO on other
1265  *      errors.
1266  */
1267 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1268 {
1269         unsigned int err_mask;
1270         struct ata_taskfile tf;
1271         int lba48 = ata_id_has_lba48(dev->id);
1272 
1273         new_sectors--;
1274 
1275         ata_tf_init(dev, &tf);
1276 
1277         tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1278 
1279         if (lba48) {
1280                 tf.command = ATA_CMD_SET_MAX_EXT;
1281                 tf.flags |= ATA_TFLAG_LBA48;
1282 
1283                 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1284                 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1285                 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1286         } else {
1287                 tf.command = ATA_CMD_SET_MAX;
1288 
1289                 tf.device |= (new_sectors >> 24) & 0xf;
1290         }
1291 
1292         tf.protocol = ATA_PROT_NODATA;
1293         tf.device |= ATA_LBA;
1294 
1295         tf.lbal = (new_sectors >> 0) & 0xff;
1296         tf.lbam = (new_sectors >> 8) & 0xff;
1297         tf.lbah = (new_sectors >> 16) & 0xff;
1298 
1299         err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1300         if (err_mask) {
1301                 ata_dev_warn(dev,
1302                              "failed to set max address (err_mask=0x%x)\n",
1303                              err_mask);
1304                 if (err_mask == AC_ERR_DEV &&
1305                     (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1306                         return -EACCES;
1307                 return -EIO;
1308         }
1309 
1310         return 0;
1311 }
1312 
1313 /**
1314  *      ata_hpa_resize          -       Resize a device with an HPA set
1315  *      @dev: Device to resize
1316  *
1317  *      Read the size of an LBA28 or LBA48 disk with HPA features and resize
1318  *      it if required to the full size of the media. The caller must check
1319  *      the drive has the HPA feature set enabled.
1320  *
1321  *      RETURNS:
1322  *      0 on success, -errno on failure.
1323  */
1324 static int ata_hpa_resize(struct ata_device *dev)
1325 {
1326         struct ata_eh_context *ehc = &dev->link->eh_context;
1327         int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1328         bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
1329         u64 sectors = ata_id_n_sectors(dev->id);
1330         u64 native_sectors;
1331         int rc;
1332 
1333         /* do we need to do it? */
1334         if ((dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ZAC) ||
1335             !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1336             (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1337                 return 0;
1338 
1339         /* read native max address */
1340         rc = ata_read_native_max_address(dev, &native_sectors);
1341         if (rc) {
1342                 /* If device aborted the command or HPA isn't going to
1343                  * be unlocked, skip HPA resizing.
1344                  */
1345                 if (rc == -EACCES || !unlock_hpa) {
1346                         ata_dev_warn(dev,
1347                                      "HPA support seems broken, skipping HPA handling\n");
1348                         dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1349 
1350                         /* we can continue if device aborted the command */
1351                         if (rc == -EACCES)
1352                                 rc = 0;
1353                 }
1354 
1355                 return rc;
1356         }
1357         dev->n_native_sectors = native_sectors;
1358 
1359         /* nothing to do? */
1360         if (native_sectors <= sectors || !unlock_hpa) {
1361                 if (!print_info || native_sectors == sectors)
1362                         return 0;
1363 
1364                 if (native_sectors > sectors)
1365                         ata_dev_info(dev,
1366                                 "HPA detected: current %llu, native %llu\n",
1367                                 (unsigned long long)sectors,
1368                                 (unsigned long long)native_sectors);
1369                 else if (native_sectors < sectors)
1370                         ata_dev_warn(dev,
1371                                 "native sectors (%llu) is smaller than sectors (%llu)\n",
1372                                 (unsigned long long)native_sectors,
1373                                 (unsigned long long)sectors);
1374                 return 0;
1375         }
1376 
1377         /* let's unlock HPA */
1378         rc = ata_set_max_sectors(dev, native_sectors);
1379         if (rc == -EACCES) {
1380                 /* if device aborted the command, skip HPA resizing */
1381                 ata_dev_warn(dev,
1382                              "device aborted resize (%llu -> %llu), skipping HPA handling\n",
1383                              (unsigned long long)sectors,
1384                              (unsigned long long)native_sectors);
1385                 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1386                 return 0;
1387         } else if (rc)
1388                 return rc;
1389 
1390         /* re-read IDENTIFY data */
1391         rc = ata_dev_reread_id(dev, 0);
1392         if (rc) {
1393                 ata_dev_err(dev,
1394                             "failed to re-read IDENTIFY data after HPA resizing\n");
1395                 return rc;
1396         }
1397 
1398         if (print_info) {
1399                 u64 new_sectors = ata_id_n_sectors(dev->id);
1400                 ata_dev_info(dev,
1401                         "HPA unlocked: %llu -> %llu, native %llu\n",
1402                         (unsigned long long)sectors,
1403                         (unsigned long long)new_sectors,
1404                         (unsigned long long)native_sectors);
1405         }
1406 
1407         return 0;
1408 }
1409 
1410 /**
1411  *      ata_dump_id - IDENTIFY DEVICE info debugging output
1412  *      @id: IDENTIFY DEVICE page to dump
1413  *
1414  *      Dump selected 16-bit words from the given IDENTIFY DEVICE
1415  *      page.
1416  *
1417  *      LOCKING:
1418  *      caller.
1419  */
1420 
1421 static inline void ata_dump_id(const u16 *id)
1422 {
1423         DPRINTK("49==0x%04x  "
1424                 "53==0x%04x  "
1425                 "63==0x%04x  "
1426                 "64==0x%04x  "
1427                 "75==0x%04x  \n",
1428                 id[49],
1429                 id[53],
1430                 id[63],
1431                 id[64],
1432                 id[75]);
1433         DPRINTK("80==0x%04x  "
1434                 "81==0x%04x  "
1435                 "82==0x%04x  "
1436                 "83==0x%04x  "
1437                 "84==0x%04x  \n",
1438                 id[80],
1439                 id[81],
1440                 id[82],
1441                 id[83],
1442                 id[84]);
1443         DPRINTK("88==0x%04x  "
1444                 "93==0x%04x\n",
1445                 id[88],
1446                 id[93]);
1447 }
1448 
1449 /**
1450  *      ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1451  *      @id: IDENTIFY data to compute xfer mask from
1452  *
1453  *      Compute the xfermask for this device. This is not as trivial
1454  *      as it seems if we must consider early devices correctly.
1455  *
1456  *      FIXME: pre IDE drive timing (do we care ?).
1457  *
1458  *      LOCKING:
1459  *      None.
1460  *
1461  *      RETURNS:
1462  *      Computed xfermask
1463  */
1464 unsigned long ata_id_xfermask(const u16 *id)
1465 {
1466         unsigned long pio_mask, mwdma_mask, udma_mask;
1467 
1468         /* Usual case. Word 53 indicates word 64 is valid */
1469         if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1470                 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1471                 pio_mask <<= 3;
1472                 pio_mask |= 0x7;
1473         } else {
1474                 /* If word 64 isn't valid then Word 51 high byte holds
1475                  * the PIO timing number for the maximum. Turn it into
1476                  * a mask.
1477                  */
1478                 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1479                 if (mode < 5)   /* Valid PIO range */
1480                         pio_mask = (2 << mode) - 1;
1481                 else
1482                         pio_mask = 1;
1483 
1484                 /* But wait.. there's more. Design your standards by
1485                  * committee and you too can get a free iordy field to
1486                  * process. However its the speeds not the modes that
1487                  * are supported... Note drivers using the timing API
1488                  * will get this right anyway
1489                  */
1490         }
1491 
1492         mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1493 
1494         if (ata_id_is_cfa(id)) {
1495                 /*
1496                  *      Process compact flash extended modes
1497                  */
1498                 int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
1499                 int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1500 
1501                 if (pio)
1502                         pio_mask |= (1 << 5);
1503                 if (pio > 1)
1504                         pio_mask |= (1 << 6);
1505                 if (dma)
1506                         mwdma_mask |= (1 << 3);
1507                 if (dma > 1)
1508                         mwdma_mask |= (1 << 4);
1509         }
1510 
1511         udma_mask = 0;
1512         if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1513                 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1514 
1515         return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1516 }
1517 
1518 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1519 {
1520         struct completion *waiting = qc->private_data;
1521 
1522         complete(waiting);
1523 }
1524 
1525 /**
1526  *      ata_exec_internal_sg - execute libata internal command
1527  *      @dev: Device to which the command is sent
1528  *      @tf: Taskfile registers for the command and the result
1529  *      @cdb: CDB for packet command
1530  *      @dma_dir: Data transfer direction of the command
1531  *      @sgl: sg list for the data buffer of the command
1532  *      @n_elem: Number of sg entries
1533  *      @timeout: Timeout in msecs (0 for default)
1534  *
1535  *      Executes libata internal command with timeout.  @tf contains
1536  *      command on entry and result on return.  Timeout and error
1537  *      conditions are reported via return value.  No recovery action
1538  *      is taken after a command times out.  It's caller's duty to
1539  *      clean up after timeout.
1540  *
1541  *      LOCKING:
1542  *      None.  Should be called with kernel context, might sleep.
1543  *
1544  *      RETURNS:
1545  *      Zero on success, AC_ERR_* mask on failure
1546  */
1547 unsigned ata_exec_internal_sg(struct ata_device *dev,
1548                               struct ata_taskfile *tf, const u8 *cdb,
1549                               int dma_dir, struct scatterlist *sgl,
1550                               unsigned int n_elem, unsigned long timeout)
1551 {
1552         struct ata_link *link = dev->link;
1553         struct ata_port *ap = link->ap;
1554         u8 command = tf->command;
1555         int auto_timeout = 0;
1556         struct ata_queued_cmd *qc;
1557         unsigned int preempted_tag;
1558         u32 preempted_sactive;
1559         u64 preempted_qc_active;
1560         int preempted_nr_active_links;
1561         DECLARE_COMPLETION_ONSTACK(wait);
1562         unsigned long flags;
1563         unsigned int err_mask;
1564         int rc;
1565 
1566         spin_lock_irqsave(ap->lock, flags);
1567 
1568         /* no internal command while frozen */
1569         if (ap->pflags & ATA_PFLAG_FROZEN) {
1570                 spin_unlock_irqrestore(ap->lock, flags);
1571                 return AC_ERR_SYSTEM;
1572         }
1573 
1574         /* initialize internal qc */
1575         qc = __ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
1576 
1577         qc->tag = ATA_TAG_INTERNAL;
1578         qc->hw_tag = 0;
1579         qc->scsicmd = NULL;
1580         qc->ap = ap;
1581         qc->dev = dev;
1582         ata_qc_reinit(qc);
1583 
1584         preempted_tag = link->active_tag;
1585         preempted_sactive = link->sactive;
1586         preempted_qc_active = ap->qc_active;
1587         preempted_nr_active_links = ap->nr_active_links;
1588         link->active_tag = ATA_TAG_POISON;
1589         link->sactive = 0;
1590         ap->qc_active = 0;
1591         ap->nr_active_links = 0;
1592 
1593         /* prepare & issue qc */
1594         qc->tf = *tf;
1595         if (cdb)
1596                 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1597 
1598         /* some SATA bridges need us to indicate data xfer direction */
1599         if (tf->protocol == ATAPI_PROT_DMA && (dev->flags & ATA_DFLAG_DMADIR) &&
1600             dma_dir == DMA_FROM_DEVICE)
1601                 qc->tf.feature |= ATAPI_DMADIR;
1602 
1603         qc->flags |= ATA_QCFLAG_RESULT_TF;
1604         qc->dma_dir = dma_dir;
1605         if (dma_dir != DMA_NONE) {
1606                 unsigned int i, buflen = 0;
1607                 struct scatterlist *sg;
1608 
1609                 for_each_sg(sgl, sg, n_elem, i)
1610                         buflen += sg->length;
1611 
1612                 ata_sg_init(qc, sgl, n_elem);
1613                 qc->nbytes = buflen;
1614         }
1615 
1616         qc->private_data = &wait;
1617         qc->complete_fn = ata_qc_complete_internal;
1618 
1619         ata_qc_issue(qc);
1620 
1621         spin_unlock_irqrestore(ap->lock, flags);
1622 
1623         if (!timeout) {
1624                 if (ata_probe_timeout)
1625                         timeout = ata_probe_timeout * 1000;
1626                 else {
1627                         timeout = ata_internal_cmd_timeout(dev, command);
1628                         auto_timeout = 1;
1629                 }
1630         }
1631 
1632         if (ap->ops->error_handler)
1633                 ata_eh_release(ap);
1634 
1635         rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1636 
1637         if (ap->ops->error_handler)
1638                 ata_eh_acquire(ap);
1639 
1640         ata_sff_flush_pio_task(ap);
1641 
1642         if (!rc) {
1643                 spin_lock_irqsave(ap->lock, flags);
1644 
1645                 /* We're racing with irq here.  If we lose, the
1646                  * following test prevents us from completing the qc
1647                  * twice.  If we win, the port is frozen and will be
1648                  * cleaned up by ->post_internal_cmd().
1649                  */
1650                 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1651                         qc->err_mask |= AC_ERR_TIMEOUT;
1652 
1653                         if (ap->ops->error_handler)
1654                                 ata_port_freeze(ap);
1655                         else
1656                                 ata_qc_complete(qc);
1657 
1658                         if (ata_msg_warn(ap))
1659                                 ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
1660                                              command);
1661                 }
1662 
1663                 spin_unlock_irqrestore(ap->lock, flags);
1664         }
1665 
1666         /* do post_internal_cmd */
1667         if (ap->ops->post_internal_cmd)
1668                 ap->ops->post_internal_cmd(qc);
1669 
1670         /* perform minimal error analysis */
1671         if (qc->flags & ATA_QCFLAG_FAILED) {
1672                 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1673                         qc->err_mask |= AC_ERR_DEV;
1674 
1675                 if (!qc->err_mask)
1676                         qc->err_mask |= AC_ERR_OTHER;
1677 
1678                 if (qc->err_mask & ~AC_ERR_OTHER)
1679                         qc->err_mask &= ~AC_ERR_OTHER;
1680         } else if (qc->tf.command == ATA_CMD_REQ_SENSE_DATA) {
1681                 qc->result_tf.command |= ATA_SENSE;
1682         }
1683 
1684         /* finish up */
1685         spin_lock_irqsave(ap->lock, flags);
1686 
1687         *tf = qc->result_tf;
1688         err_mask = qc->err_mask;
1689 
1690         ata_qc_free(qc);
1691         link->active_tag = preempted_tag;
1692         link->sactive = preempted_sactive;
1693         ap->qc_active = preempted_qc_active;
1694         ap->nr_active_links = preempted_nr_active_links;
1695 
1696         spin_unlock_irqrestore(ap->lock, flags);
1697 
1698         if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
1699                 ata_internal_cmd_timed_out(dev, command);
1700 
1701         return err_mask;
1702 }
1703 
1704 /**
1705  *      ata_exec_internal - execute libata internal command
1706  *      @dev: Device to which the command is sent
1707  *      @tf: Taskfile registers for the command and the result
1708  *      @cdb: CDB for packet command
1709  *      @dma_dir: Data transfer direction of the command
1710  *      @buf: Data buffer of the command
1711  *      @buflen: Length of data buffer
1712  *      @timeout: Timeout in msecs (0 for default)
1713  *
1714  *      Wrapper around ata_exec_internal_sg() which takes simple
1715  *      buffer instead of sg list.
1716  *
1717  *      LOCKING:
1718  *      None.  Should be called with kernel context, might sleep.
1719  *
1720  *      RETURNS:
1721  *      Zero on success, AC_ERR_* mask on failure
1722  */
1723 unsigned ata_exec_internal(struct ata_device *dev,
1724                            struct ata_taskfile *tf, const u8 *cdb,
1725                            int dma_dir, void *buf, unsigned int buflen,
1726                            unsigned long timeout)
1727 {
1728         struct scatterlist *psg = NULL, sg;
1729         unsigned int n_elem = 0;
1730 
1731         if (dma_dir != DMA_NONE) {
1732                 WARN_ON(!buf);
1733                 sg_init_one(&sg, buf, buflen);
1734                 psg = &sg;
1735                 n_elem++;
1736         }
1737 
1738         return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1739                                     timeout);
1740 }
1741 
1742 /**
1743  *      ata_pio_need_iordy      -       check if iordy needed
1744  *      @adev: ATA device
1745  *
1746  *      Check if the current speed of the device requires IORDY. Used
1747  *      by various controllers for chip configuration.
1748  */
1749 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1750 {
1751         /* Don't set IORDY if we're preparing for reset.  IORDY may
1752          * lead to controller lock up on certain controllers if the
1753          * port is not occupied.  See bko#11703 for details.
1754          */
1755         if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
1756                 return 0;
1757         /* Controller doesn't support IORDY.  Probably a pointless
1758          * check as the caller should know this.
1759          */
1760         if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1761                 return 0;
1762         /* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
1763         if (ata_id_is_cfa(adev->id)
1764             && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
1765                 return 0;
1766         /* PIO3 and higher it is mandatory */
1767         if (adev->pio_mode > XFER_PIO_2)
1768                 return 1;
1769         /* We turn it on when possible */
1770         if (ata_id_has_iordy(adev->id))
1771                 return 1;
1772         return 0;
1773 }
1774 
1775 /**
1776  *      ata_pio_mask_no_iordy   -       Return the non IORDY mask
1777  *      @adev: ATA device
1778  *
1779  *      Compute the highest mode possible if we are not using iordy. Return
1780  *      -1 if no iordy mode is available.
1781  */
1782 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1783 {
1784         /* If we have no drive specific rule, then PIO 2 is non IORDY */
1785         if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1786                 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1787                 /* Is the speed faster than the drive allows non IORDY ? */
1788                 if (pio) {
1789                         /* This is cycle times not frequency - watch the logic! */
1790                         if (pio > 240)  /* PIO2 is 240nS per cycle */
1791                                 return 3 << ATA_SHIFT_PIO;
1792                         return 7 << ATA_SHIFT_PIO;
1793                 }
1794         }
1795         return 3 << ATA_SHIFT_PIO;
1796 }
1797 
1798 /**
1799  *      ata_do_dev_read_id              -       default ID read method
1800  *      @dev: device
1801  *      @tf: proposed taskfile
1802  *      @id: data buffer
1803  *
1804  *      Issue the identify taskfile and hand back the buffer containing
1805  *      identify data. For some RAID controllers and for pre ATA devices
1806  *      this function is wrapped or replaced by the driver
1807  */
1808 unsigned int ata_do_dev_read_id(struct ata_device *dev,
1809                                         struct ata_taskfile *tf, u16 *id)
1810 {
1811         return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
1812                                      id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1813 }
1814 
1815 /**
1816  *      ata_dev_read_id - Read ID data from the specified device
1817  *      @dev: target device
1818  *      @p_class: pointer to class of the target device (may be changed)
1819  *      @flags: ATA_READID_* flags
1820  *      @id: buffer to read IDENTIFY data into
1821  *
1822  *      Read ID data from the specified device.  ATA_CMD_ID_ATA is
1823  *      performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1824  *      devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
1825  *      for pre-ATA4 drives.
1826  *
1827  *      FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1828  *      now we abort if we hit that case.
1829  *
1830  *      LOCKING:
1831  *      Kernel thread context (may sleep)
1832  *
1833  *      RETURNS:
1834  *      0 on success, -errno otherwise.
1835  */
1836 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1837                     unsigned int flags, u16 *id)
1838 {
1839         struct ata_port *ap = dev->link->ap;
1840         unsigned int class = *p_class;
1841         struct ata_taskfile tf;
1842         unsigned int err_mask = 0;
1843         const char *reason;
1844         bool is_semb = class == ATA_DEV_SEMB;
1845         int may_fallback = 1, tried_spinup = 0;
1846         int rc;
1847 
1848         if (ata_msg_ctl(ap))
1849                 ata_dev_dbg(dev, "%s: ENTER\n", __func__);
1850 
1851 retry:
1852         ata_tf_init(dev, &tf);
1853 
1854         switch (class) {
1855         case ATA_DEV_SEMB:
1856                 class = ATA_DEV_ATA;    /* some hard drives report SEMB sig */
1857                 /* fall through */
1858         case ATA_DEV_ATA:
1859         case ATA_DEV_ZAC:
1860                 tf.command = ATA_CMD_ID_ATA;
1861                 break;
1862         case ATA_DEV_ATAPI:
1863                 tf.command = ATA_CMD_ID_ATAPI;
1864                 break;
1865         default:
1866                 rc = -ENODEV;
1867                 reason = "unsupported class";
1868                 goto err_out;
1869         }
1870 
1871         tf.protocol = ATA_PROT_PIO;
1872 
1873         /* Some devices choke if TF registers contain garbage.  Make
1874          * sure those are properly initialized.
1875          */
1876         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1877 
1878         /* Device presence detection is unreliable on some
1879          * controllers.  Always poll IDENTIFY if available.
1880          */
1881         tf.flags |= ATA_TFLAG_POLLING;
1882 
1883         if (ap->ops->read_id)
1884                 err_mask = ap->ops->read_id(dev, &tf, id);
1885         else
1886                 err_mask = ata_do_dev_read_id(dev, &tf, id);
1887 
1888         if (err_mask) {
1889                 if (err_mask & AC_ERR_NODEV_HINT) {
1890                         ata_dev_dbg(dev, "NODEV after polling detection\n");
1891                         return -ENOENT;
1892                 }
1893 
1894                 if (is_semb) {
1895                         ata_dev_info(dev,
1896                      "IDENTIFY failed on device w/ SEMB sig, disabled\n");
1897                         /* SEMB is not supported yet */
1898                         *p_class = ATA_DEV_SEMB_UNSUP;
1899                         return 0;
1900                 }
1901 
1902                 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1903                         /* Device or controller might have reported
1904                          * the wrong device class.  Give a shot at the
1905                          * other IDENTIFY if the current one is
1906                          * aborted by the device.
1907                          */
1908                         if (may_fallback) {
1909                                 may_fallback = 0;
1910 
1911                                 if (class == ATA_DEV_ATA)
1912                                         class = ATA_DEV_ATAPI;
1913                                 else
1914                                         class = ATA_DEV_ATA;
1915                                 goto retry;
1916                         }
1917 
1918                         /* Control reaches here iff the device aborted
1919                          * both flavors of IDENTIFYs which happens
1920                          * sometimes with phantom devices.
1921                          */
1922                         ata_dev_dbg(dev,
1923                                     "both IDENTIFYs aborted, assuming NODEV\n");
1924                         return -ENOENT;
1925                 }
1926 
1927                 rc = -EIO;
1928                 reason = "I/O error";
1929                 goto err_out;
1930         }
1931 
1932         if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1933                 ata_dev_dbg(dev, "dumping IDENTIFY data, "
1934                             "class=%d may_fallback=%d tried_spinup=%d\n",
1935                             class, may_fallback, tried_spinup);
1936                 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
1937                                16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
1938         }
1939 
1940         /* Falling back doesn't make sense if ID data was read
1941          * successfully at least once.
1942          */
1943         may_fallback = 0;
1944 
1945         swap_buf_le16(id, ATA_ID_WORDS);
1946 
1947         /* sanity check */
1948         rc = -EINVAL;
1949         reason = "device reports invalid type";
1950 
1951         if (class == ATA_DEV_ATA || class == ATA_DEV_ZAC) {
1952                 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1953                         goto err_out;
1954                 if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
1955                                                         ata_id_is_ata(id)) {
1956                         ata_dev_dbg(dev,
1957                                 "host indicates ignore ATA devices, ignored\n");
1958                         return -ENOENT;
1959                 }
1960         } else {
1961                 if (ata_id_is_ata(id))
1962                         goto err_out;
1963         }
1964 
1965         if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1966                 tried_spinup = 1;
1967                 /*
1968                  * Drive powered-up in standby mode, and requires a specific
1969                  * SET_FEATURES spin-up subcommand before it will accept
1970                  * anything other than the original IDENTIFY command.
1971                  */
1972                 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1973                 if (err_mask && id[2] != 0x738c) {
1974                         rc = -EIO;
1975                         reason = "SPINUP failed";
1976                         goto err_out;
1977                 }
1978                 /*
1979                  * If the drive initially returned incomplete IDENTIFY info,
1980                  * we now must reissue the IDENTIFY command.
1981                  */
1982                 if (id[2] == 0x37c8)
1983                         goto retry;
1984         }
1985 
1986         if ((flags & ATA_READID_POSTRESET) &&
1987             (class == ATA_DEV_ATA || class == ATA_DEV_ZAC)) {
1988                 /*
1989                  * The exact sequence expected by certain pre-ATA4 drives is:
1990                  * SRST RESET
1991                  * IDENTIFY (optional in early ATA)
1992                  * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1993                  * anything else..
1994                  * Some drives were very specific about that exact sequence.
1995                  *
1996                  * Note that ATA4 says lba is mandatory so the second check
1997                  * should never trigger.
1998                  */
1999                 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2000                         err_mask = ata_dev_init_params(dev, id[3], id[6]);
2001                         if (err_mask) {
2002                                 rc = -EIO;
2003                                 reason = "INIT_DEV_PARAMS failed";
2004                                 goto err_out;
2005                         }
2006 
2007                         /* current CHS translation info (id[53-58]) might be
2008                          * changed. reread the identify device info.
2009                          */
2010                         flags &= ~ATA_READID_POSTRESET;
2011                         goto retry;
2012                 }
2013         }
2014 
2015         *p_class = class;
2016 
2017         return 0;
2018 
2019  err_out:
2020         if (ata_msg_warn(ap))
2021                 ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
2022                              reason, err_mask);
2023         return rc;
2024 }
2025 
2026 /**
2027  *      ata_read_log_page - read a specific log page
2028  *      @dev: target device
2029  *      @log: log to read
2030  *      @page: page to read
2031  *      @buf: buffer to store read page
2032  *      @sectors: number of sectors to read
2033  *
2034  *      Read log page using READ_LOG_EXT command.
2035  *
2036  *      LOCKING:
2037  *      Kernel thread context (may sleep).
2038  *
2039  *      RETURNS:
2040  *      0 on success, AC_ERR_* mask otherwise.
2041  */
2042 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
2043                                u8 page, void *buf, unsigned int sectors)
2044 {
2045         unsigned long ap_flags = dev->link->ap->flags;
2046         struct ata_taskfile tf;
2047         unsigned int err_mask;
2048         bool dma = false;
2049 
2050         DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
2051 
2052         /*
2053          * Return error without actually issuing the command on controllers
2054          * which e.g. lockup on a read log page.
2055          */
2056         if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
2057                 return AC_ERR_DEV;
2058 
2059 retry:
2060         ata_tf_init(dev, &tf);
2061         if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id) &&
2062             !(dev->horkage & ATA_HORKAGE_NO_DMA_LOG)) {
2063                 tf.command = ATA_CMD_READ_LOG_DMA_EXT;
2064                 tf.protocol = ATA_PROT_DMA;
2065                 dma = true;
2066         } else {
2067                 tf.command = ATA_CMD_READ_LOG_EXT;
2068                 tf.protocol = ATA_PROT_PIO;
2069                 dma = false;
2070         }
2071         tf.lbal = log;
2072         tf.lbam = page;
2073         tf.nsect = sectors;
2074         tf.hob_nsect = sectors >> 8;
2075         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
2076 
2077         err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
2078                                      buf, sectors * ATA_SECT_SIZE, 0);
2079 
2080         if (err_mask && dma) {
2081                 dev->horkage |= ATA_HORKAGE_NO_DMA_LOG;
2082                 ata_dev_warn(dev, "READ LOG DMA EXT failed, trying PIO\n");
2083                 goto retry;
2084         }
2085 
2086         DPRINTK("EXIT, err_mask=%x\n", err_mask);
2087         return err_mask;
2088 }
2089 
2090 static bool ata_log_supported(struct ata_device *dev, u8 log)
2091 {
2092         struct ata_port *ap = dev->link->ap;
2093 
2094         if (ata_read_log_page(dev, ATA_LOG_DIRECTORY, 0, ap->sector_buf, 1))
2095                 return false;
2096         return get_unaligned_le16(&ap->sector_buf[log * 2]) ? true : false;
2097 }
2098 
2099 static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
2100 {
2101         struct ata_port *ap = dev->link->ap;
2102         unsigned int err, i;
2103 
2104         if (!ata_log_supported(dev, ATA_LOG_IDENTIFY_DEVICE)) {
2105                 ata_dev_warn(dev, "ATA Identify Device Log not supported\n");
2106                 return false;
2107         }
2108 
2109         /*
2110          * Read IDENTIFY DEVICE data log, page 0, to figure out if the page is
2111          * supported.
2112          */
2113         err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0, ap->sector_buf,
2114                                 1);
2115         if (err) {
2116                 ata_dev_info(dev,
2117                              "failed to get Device Identify Log Emask 0x%x\n",
2118                              err);
2119                 return false;
2120         }
2121 
2122         for (i = 0; i < ap->sector_buf[8]; i++) {
2123                 if (ap->sector_buf[9 + i] == page)
2124                         return true;
2125         }
2126 
2127         return false;
2128 }
2129 
2130 static int ata_do_link_spd_horkage(struct ata_device *dev)
2131 {
2132         struct ata_link *plink = ata_dev_phys_link(dev);
2133         u32 target, target_limit;
2134 
2135         if (!sata_scr_valid(plink))
2136                 return 0;
2137 
2138         if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
2139                 target = 1;
2140         else
2141                 return 0;
2142 
2143         target_limit = (1 << target) - 1;
2144 
2145         /* if already on stricter limit, no need to push further */
2146         if (plink->sata_spd_limit <= target_limit)
2147                 return 0;
2148 
2149         plink->sata_spd_limit = target_limit;
2150 
2151         /* Request another EH round by returning -EAGAIN if link is
2152          * going faster than the target speed.  Forward progress is
2153          * guaranteed by setting sata_spd_limit to target_limit above.
2154          */
2155         if (plink->sata_spd > target) {
2156                 ata_dev_info(dev, "applying link speed limit horkage to %s\n",
2157                              sata_spd_string(target));
2158                 return -EAGAIN;
2159         }
2160         return 0;
2161 }
2162 
2163 static inline u8 ata_dev_knobble(struct ata_device *dev)
2164 {
2165         struct ata_port *ap = dev->link->ap;
2166 
2167         if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
2168                 return 0;
2169 
2170         return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2171 }
2172 
2173 static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
2174 {
2175         struct ata_port *ap = dev->link->ap;
2176         unsigned int err_mask;
2177 
2178         if (!ata_log_supported(dev, ATA_LOG_NCQ_SEND_RECV)) {
2179                 ata_dev_warn(dev, "NCQ Send/Recv Log not supported\n");
2180                 return;
2181         }
2182         err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
2183                                      0, ap->sector_buf, 1);
2184         if (err_mask) {
2185                 ata_dev_dbg(dev,
2186                             "failed to get NCQ Send/Recv Log Emask 0x%x\n",
2187                             err_mask);
2188         } else {
2189                 u8 *cmds = dev->ncq_send_recv_cmds;
2190 
2191                 dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
2192                 memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);
2193 
2194                 if (dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM) {
2195                         ata_dev_dbg(dev, "disabling queued TRIM support\n");
2196                         cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET] &=
2197                                 ~ATA_LOG_NCQ_SEND_RECV_DSM_TRIM;
2198                 }
2199         }
2200 }
2201 
2202 static void ata_dev_config_ncq_non_data(struct ata_device *dev)
2203 {
2204         struct ata_port *ap = dev->link->ap;
2205         unsigned int err_mask;
2206 
2207         if (!ata_log_supported(dev, ATA_LOG_NCQ_NON_DATA)) {
2208                 ata_dev_warn(dev,
2209                              "NCQ Send/Recv Log not supported\n");
2210                 return;
2211         }
2212         err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_NON_DATA,
2213                                      0, ap->sector_buf, 1);
2214         if (err_mask) {
2215                 ata_dev_dbg(dev,
2216                             "failed to get NCQ Non-Data Log Emask 0x%x\n",
2217                             err_mask);
2218         } else {
2219                 u8 *cmds = dev->ncq_non_data_cmds;
2220 
2221                 memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_NON_DATA_SIZE);
2222         }
2223 }
2224 
2225 static void ata_dev_config_ncq_prio(struct ata_device *dev)
2226 {
2227         struct ata_port *ap = dev->link->ap;
2228         unsigned int err_mask;
2229 
2230         if (!(dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) {
2231                 dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2232                 return;
2233         }
2234 
2235         err_mask = ata_read_log_page(dev,
2236                                      ATA_LOG_IDENTIFY_DEVICE,
2237                                      ATA_LOG_SATA_SETTINGS,
2238                                      ap->sector_buf,
2239                                      1);
2240         if (err_mask) {
2241                 ata_dev_dbg(dev,
2242                             "failed to get Identify Device data, Emask 0x%x\n",
2243                             err_mask);
2244                 return;
2245         }
2246 
2247         if (ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)) {
2248                 dev->flags |= ATA_DFLAG_NCQ_PRIO;
2249         } else {
2250                 dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2251                 ata_dev_dbg(dev, "SATA page does not support priority\n");
2252         }
2253 
2254 }
2255 
2256 static int ata_dev_config_ncq(struct ata_device *dev,
2257                                char *desc, size_t desc_sz)
2258 {
2259         struct ata_port *ap = dev->link->ap;
2260         int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2261         unsigned int err_mask;
2262         char *aa_desc = "";
2263 
2264         if (!ata_id_has_ncq(dev->id)) {
2265                 desc[0] = '\0';
2266                 return 0;
2267         }
2268         if (dev->horkage & ATA_HORKAGE_NONCQ) {
2269                 snprintf(desc, desc_sz, "NCQ (not used)");
2270                 return 0;
2271         }
2272         if (ap->flags & ATA_FLAG_NCQ) {
2273                 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE);
2274                 dev->flags |= ATA_DFLAG_NCQ;
2275         }
2276 
2277         if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
2278                 (ap->flags & ATA_FLAG_FPDMA_AA) &&
2279                 ata_id_has_fpdma_aa(dev->id)) {
2280                 err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
2281                         SATA_FPDMA_AA);
2282                 if (err_mask) {
2283                         ata_dev_err(dev,
2284                                     "failed to enable AA (error_mask=0x%x)\n",
2285                                     err_mask);
2286                         if (err_mask != AC_ERR_DEV) {
2287                                 dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
2288                                 return -EIO;
2289                         }
2290                 } else
2291                         aa_desc = ", AA";
2292         }
2293 
2294         if (hdepth >= ddepth)
2295                 snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2296         else
2297                 snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
2298                         ddepth, aa_desc);
2299 
2300         if ((ap->flags & ATA_FLAG_FPDMA_AUX)) {
2301                 if (ata_id_has_ncq_send_and_recv(dev->id))
2302                         ata_dev_config_ncq_send_recv(dev);
2303                 if (ata_id_has_ncq_non_data(dev->id))
2304                         ata_dev_config_ncq_non_data(dev);
2305                 if (ata_id_has_ncq_prio(dev->id))
2306                         ata_dev_config_ncq_prio(dev);
2307         }
2308 
2309         return 0;
2310 }
2311 
2312 static void ata_dev_config_sense_reporting(struct ata_device *dev)
2313 {
2314         unsigned int err_mask;
2315 
2316         if (!ata_id_has_sense_reporting(dev->id))
2317                 return;
2318 
2319         if (ata_id_sense_reporting_enabled(dev->id))
2320                 return;
2321 
2322         err_mask = ata_dev_set_feature(dev, SETFEATURE_SENSE_DATA, 0x1);
2323         if (err_mask) {
2324                 ata_dev_dbg(dev,
2325                             "failed to enable Sense Data Reporting, Emask 0x%x\n",
2326                             err_mask);
2327         }
2328 }
2329 
2330 static void ata_dev_config_zac(struct ata_device *dev)
2331 {
2332         struct ata_port *ap = dev->link->ap;
2333         unsigned int err_mask;
2334         u8 *identify_buf = ap->sector_buf;
2335 
2336         dev->zac_zones_optimal_open = U32_MAX;
2337         dev->zac_zones_optimal_nonseq = U32_MAX;
2338         dev->zac_zones_max_open = U32_MAX;
2339 
2340         /*
2341          * Always set the 'ZAC' flag for Host-managed devices.
2342          */
2343         if (dev->class == ATA_DEV_ZAC)
2344                 dev->flags |= ATA_DFLAG_ZAC;
2345         else if (ata_id_zoned_cap(dev->id) == 0x01)
2346                 /*
2347                  * Check for host-aware devices.
2348                  */
2349                 dev->flags |= ATA_DFLAG_ZAC;
2350 
2351         if (!(dev->flags & ATA_DFLAG_ZAC))
2352                 return;
2353 
2354         if (!ata_identify_page_supported(dev, ATA_LOG_ZONED_INFORMATION)) {
2355                 ata_dev_warn(dev,
2356                              "ATA Zoned Information Log not supported\n");
2357                 return;
2358         }
2359 
2360         /*
2361          * Read IDENTIFY DEVICE data log, page 9 (Zoned-device information)
2362          */
2363         err_mask = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE,
2364                                      ATA_LOG_ZONED_INFORMATION,
2365                                      identify_buf, 1);
2366         if (!err_mask) {
2367                 u64 zoned_cap, opt_open, opt_nonseq, max_open;
2368 
2369                 zoned_cap = get_unaligned_le64(&identify_buf[8]);
2370                 if ((zoned_cap >> 63))
2371                         dev->zac_zoned_cap = (zoned_cap & 1);
2372                 opt_open = get_unaligned_le64(&identify_buf[24]);
2373                 if ((opt_open >> 63))
2374                         dev->zac_zones_optimal_open = (u32)opt_open;
2375                 opt_nonseq = get_unaligned_le64(&identify_buf[32]);
2376                 if ((opt_nonseq >> 63))
2377                         dev->zac_zones_optimal_nonseq = (u32)opt_nonseq;
2378                 max_open = get_unaligned_le64(&identify_buf[40]);
2379                 if ((max_open >> 63))
2380                         dev->zac_zones_max_open = (u32)max_open;
2381         }
2382 }
2383 
2384 static void ata_dev_config_trusted(struct ata_device *dev)
2385 {
2386         struct ata_port *ap = dev->link->ap;
2387         u64 trusted_cap;
2388         unsigned int err;
2389 
2390         if (!ata_id_has_trusted(dev->id))
2391                 return;
2392 
2393         if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
2394                 ata_dev_warn(dev,
2395                              "Security Log not supported\n");
2396                 return;
2397         }
2398 
2399         err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, ATA_LOG_SECURITY,
2400                         ap->sector_buf, 1);
2401         if (err) {
2402                 ata_dev_dbg(dev,
2403                             "failed to read Security Log, Emask 0x%x\n", err);
2404                 return;
2405         }
2406 
2407         trusted_cap = get_unaligned_le64(&ap->sector_buf[40]);
2408         if (!(trusted_cap & (1ULL << 63))) {
2409                 ata_dev_dbg(dev,
2410                             "Trusted Computing capability qword not valid!\n");
2411                 return;
2412         }
2413 
2414         if (trusted_cap & (1 << 0))
2415                 dev->flags |= ATA_DFLAG_TRUSTED;
2416 }
2417 
2418 /**
2419  *      ata_dev_configure - Configure the specified ATA/ATAPI device
2420  *      @dev: Target device to configure
2421  *
2422  *      Configure @dev according to @dev->id.  Generic and low-level
2423  *      driver specific fixups are also applied.
2424  *
2425  *      LOCKING:
2426  *      Kernel thread context (may sleep)
2427  *
2428  *      RETURNS:
2429  *      0 on success, -errno otherwise
2430  */
2431 int ata_dev_configure(struct ata_device *dev)
2432 {
2433         struct ata_port *ap = dev->link->ap;
2434         struct ata_eh_context *ehc = &dev->link->eh_context;
2435         int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2436         const u16 *id = dev->id;
2437         unsigned long xfer_mask;
2438         unsigned int err_mask;
2439         char revbuf[7];         /* XYZ-99\0 */
2440         char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2441         char modelbuf[ATA_ID_PROD_LEN+1];
2442         int rc;
2443 
2444         if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2445                 ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2446                 return 0;
2447         }
2448 
2449         if (ata_msg_probe(ap))
2450                 ata_dev_dbg(dev, "%s: ENTER\n", __func__);
2451 
2452         /* set horkage */
2453         dev->horkage |= ata_dev_blacklisted(dev);
2454         ata_force_horkage(dev);
2455 
2456         if (dev->horkage & ATA_HORKAGE_DISABLE) {
2457                 ata_dev_info(dev, "unsupported device, disabling\n");
2458                 ata_dev_disable(dev);
2459                 return 0;
2460         }
2461 
2462         if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
2463             dev->class == ATA_DEV_ATAPI) {
2464                 ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
2465                              atapi_enabled ? "not supported with this driver"
2466                              : "disabled");
2467                 ata_dev_disable(dev);
2468                 return 0;
2469         }
2470 
2471         rc = ata_do_link_spd_horkage(dev);
2472         if (rc)
2473                 return rc;
2474 
2475         /* some WD SATA-1 drives have issues with LPM, turn on NOLPM for them */
2476         if ((dev->horkage & ATA_HORKAGE_WD_BROKEN_LPM) &&
2477             (id[ATA_ID_SATA_CAPABILITY] & 0xe) == 0x2)
2478                 dev->horkage |= ATA_HORKAGE_NOLPM;
2479 
2480         if (ap->flags & ATA_FLAG_NO_LPM)
2481                 dev->horkage |= ATA_HORKAGE_NOLPM;
2482 
2483         if (dev->horkage & ATA_HORKAGE_NOLPM) {
2484                 ata_dev_warn(dev, "LPM support broken, forcing max_power\n");
2485                 dev->link->ap->target_lpm_policy = ATA_LPM_MAX_POWER;
2486         }
2487 
2488         /* let ACPI work its magic */
2489         rc = ata_acpi_on_devcfg(dev);
2490         if (rc)
2491                 return rc;
2492 
2493         /* massage HPA, do it early as it might change IDENTIFY data */
2494         rc = ata_hpa_resize(dev);
2495         if (rc)
2496                 return rc;
2497 
2498         /* print device capabilities */
2499         if (ata_msg_probe(ap))
2500                 ata_dev_dbg(dev,
2501                             "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2502                             "85:%04x 86:%04x 87:%04x 88:%04x\n",
2503                             __func__,
2504                             id[49], id[82], id[83], id[84],
2505                             id[85], id[86], id[87], id[88]);
2506 
2507         /* initialize to-be-configured parameters */
2508         dev->flags &= ~ATA_DFLAG_CFG_MASK;
2509         dev->max_sectors = 0;
2510         dev->cdb_len = 0;
2511         dev->n_sectors = 0;
2512         dev->cylinders = 0;
2513         dev->heads = 0;
2514         dev->sectors = 0;
2515         dev->multi_count = 0;
2516 
2517         /*
2518          * common ATA, ATAPI feature tests
2519          */
2520 
2521         /* find max transfer mode; for printk only */
2522         xfer_mask = ata_id_xfermask(id);
2523 
2524         if (ata_msg_probe(ap))
2525                 ata_dump_id(id);
2526 
2527         /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2528         ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2529                         sizeof(fwrevbuf));
2530 
2531         ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2532                         sizeof(modelbuf));
2533 
2534         /* ATA-specific feature tests */
2535         if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
2536                 if (ata_id_is_cfa(id)) {
2537                         /* CPRM may make this media unusable */
2538                         if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2539                                 ata_dev_warn(dev,
2540         "supports DRM functions and may not be fully accessible\n");
2541                         snprintf(revbuf, 7, "CFA");
2542                 } else {
2543                         snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2544                         /* Warn the user if the device has TPM extensions */
2545                         if (ata_id_has_tpm(id))
2546                                 ata_dev_warn(dev,
2547         "supports DRM functions and may not be fully accessible\n");
2548                 }
2549 
2550                 dev->n_sectors = ata_id_n_sectors(id);
2551 
2552                 /* get current R/W Multiple count setting */
2553                 if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
2554                         unsigned int max = dev->id[47] & 0xff;
2555                         unsigned int cnt = dev->id[59] & 0xff;
2556                         /* only recognize/allow powers of two here */
2557                         if (is_power_of_2(max) && is_power_of_2(cnt))
2558                                 if (cnt <= max)
2559                                         dev->multi_count = cnt;
2560                 }
2561 
2562                 if (ata_id_has_lba(id)) {
2563                         const char *lba_desc;
2564                         char ncq_desc[24];
2565 
2566                         lba_desc = "LBA";
2567                         dev->flags |= ATA_DFLAG_LBA;
2568                         if (ata_id_has_lba48(id)) {
2569                                 dev->flags |= ATA_DFLAG_LBA48;
2570                                 lba_desc = "LBA48";
2571 
2572                                 if (dev->n_sectors >= (1UL << 28) &&
2573                                     ata_id_has_flush_ext(id))
2574                                         dev->flags |= ATA_DFLAG_FLUSH_EXT;
2575                         }
2576 
2577                         /* config NCQ */
2578                         rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2579                         if (rc)
2580                                 return rc;
2581 
2582                         /* print device info to dmesg */
2583                         if (ata_msg_drv(ap) && print_info) {
2584                                 ata_dev_info(dev, "%s: %s, %s, max %s\n",
2585                                              revbuf, modelbuf, fwrevbuf,
2586                                              ata_mode_string(xfer_mask));
2587                                 ata_dev_info(dev,
2588                                              "%llu sectors, multi %u: %s %s\n",
2589                                         (unsigned long long)dev->n_sectors,
2590                                         dev->multi_count, lba_desc, ncq_desc);
2591                         }
2592                 } else {
2593                         /* CHS */
2594 
2595                         /* Default translation */
2596                         dev->cylinders  = id[1];
2597                         dev->heads      = id[3];
2598                         dev->sectors    = id[6];
2599 
2600                         if (ata_id_current_chs_valid(id)) {
2601                                 /* Current CHS translation is valid. */
2602                                 dev->cylinders = id[54];
2603                                 dev->heads     = id[55];
2604                                 dev->sectors   = id[56];
2605                         }
2606 
2607                         /* print device info to dmesg */
2608                         if (ata_msg_drv(ap) && print_info) {
2609                                 ata_dev_info(dev, "%s: %s, %s, max %s\n",
2610                                              revbuf,    modelbuf, fwrevbuf,
2611                                              ata_mode_string(xfer_mask));
2612                                 ata_dev_info(dev,
2613                                              "%llu sectors, multi %u, CHS %u/%u/%u\n",
2614                                              (unsigned long long)dev->n_sectors,
2615                                              dev->multi_count, dev->cylinders,
2616                                              dev->heads, dev->sectors);
2617                         }
2618                 }
2619 
2620                 /* Check and mark DevSlp capability. Get DevSlp timing variables
2621                  * from SATA Settings page of Identify Device Data Log.
2622                  */
2623                 if (ata_id_has_devslp(dev->id)) {
2624                         u8 *sata_setting = ap->sector_buf;
2625                         int i, j;
2626 
2627                         dev->flags |= ATA_DFLAG_DEVSLP;
2628                         err_mask = ata_read_log_page(dev,
2629                                                      ATA_LOG_IDENTIFY_DEVICE,
2630                                                      ATA_LOG_SATA_SETTINGS,
2631                                                      sata_setting,
2632                                                      1);
2633                         if (err_mask)
2634                                 ata_dev_dbg(dev,
2635                                             "failed to get Identify Device Data, Emask 0x%x\n",
2636                                             err_mask);
2637                         else
2638                                 for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
2639                                         j = ATA_LOG_DEVSLP_OFFSET + i;
2640                                         dev->devslp_timing[i] = sata_setting[j];
2641                                 }
2642                 }
2643                 ata_dev_config_sense_reporting(dev);
2644                 ata_dev_config_zac(dev);
2645                 ata_dev_config_trusted(dev);
2646                 dev->cdb_len = 32;
2647         }
2648 
2649         /* ATAPI-specific feature tests */
2650         else if (dev->class == ATA_DEV_ATAPI) {
2651                 const char *cdb_intr_string = "";
2652                 const char *atapi_an_string = "";
2653                 const char *dma_dir_string = "";
2654                 u32 sntf;
2655 
2656                 rc = atapi_cdb_len(id);
2657                 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2658                         if (ata_msg_warn(ap))
2659                                 ata_dev_warn(dev, "unsupported CDB len\n");
2660                         rc = -EINVAL;
2661                         goto err_out_nosup;
2662                 }
2663                 dev->cdb_len = (unsigned int) rc;
2664 
2665                 /* Enable ATAPI AN if both the host and device have
2666                  * the support.  If PMP is attached, SNTF is required
2667                  * to enable ATAPI AN to discern between PHY status
2668                  * changed notifications and ATAPI ANs.
2669                  */
2670                 if (atapi_an &&
2671                     (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2672                     (!sata_pmp_attached(ap) ||
2673                      sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2674                         /* issue SET feature command to turn this on */
2675                         err_mask = ata_dev_set_feature(dev,
2676                                         SETFEATURES_SATA_ENABLE, SATA_AN);
2677                         if (err_mask)
2678                                 ata_dev_err(dev,
2679                                             "failed to enable ATAPI AN (err_mask=0x%x)\n",
2680                                             err_mask);
2681                         else {
2682                                 dev->flags |= ATA_DFLAG_AN;
2683                                 atapi_an_string = ", ATAPI AN";
2684                         }
2685                 }
2686 
2687                 if (ata_id_cdb_intr(dev->id)) {
2688                         dev->flags |= ATA_DFLAG_CDB_INTR;
2689                         cdb_intr_string = ", CDB intr";
2690                 }
2691 
2692                 if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR) || atapi_id_dmadir(dev->id)) {
2693                         dev->flags |= ATA_DFLAG_DMADIR;
2694                         dma_dir_string = ", DMADIR";
2695                 }
2696 
2697                 if (ata_id_has_da(dev->id)) {
2698                         dev->flags |= ATA_DFLAG_DA;
2699                         zpodd_init(dev);
2700                 }
2701 
2702                 /* print device info to dmesg */
2703                 if (ata_msg_drv(ap) && print_info)
2704                         ata_dev_info(dev,
2705                                      "ATAPI: %s, %s, max %s%s%s%s\n",
2706                                      modelbuf, fwrevbuf,
2707                                      ata_mode_string(xfer_mask),
2708                                      cdb_intr_string, atapi_an_string,
2709                                      dma_dir_string);
2710         }
2711 
2712         /* determine max_sectors */
2713         dev->max_sectors = ATA_MAX_SECTORS;
2714         if (dev->flags & ATA_DFLAG_LBA48)
2715                 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2716 
2717         /* Limit PATA drive on SATA cable bridge transfers to udma5,
2718            200 sectors */
2719         if (ata_dev_knobble(dev)) {
2720                 if (ata_msg_drv(ap) && print_info)
2721                         ata_dev_info(dev, "applying bridge limits\n");
2722                 dev->udma_mask &= ATA_UDMA5;
2723                 dev->max_sectors = ATA_MAX_SECTORS;
2724         }
2725 
2726         if ((dev->class == ATA_DEV_ATAPI) &&
2727             (atapi_command_packet_set(id) == TYPE_TAPE)) {
2728                 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2729                 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2730         }
2731 
2732         if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2733                 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2734                                          dev->max_sectors);
2735 
2736         if (dev->horkage & ATA_HORKAGE_MAX_SEC_1024)
2737                 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_1024,
2738                                          dev->max_sectors);
2739 
2740         if (dev->horkage & ATA_HORKAGE_MAX_SEC_LBA48)
2741                 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2742 
2743         if (ap->ops->dev_config)
2744                 ap->ops->dev_config(dev);
2745 
2746         if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2747                 /* Let the user know. We don't want to disallow opens for
2748                    rescue purposes, or in case the vendor is just a blithering
2749                    idiot. Do this after the dev_config call as some controllers
2750                    with buggy firmware may want to avoid reporting false device
2751                    bugs */
2752 
2753                 if (print_info) {
2754                         ata_dev_warn(dev,
2755 "Drive reports diagnostics failure. This may indicate a drive\n");
2756                         ata_dev_warn(dev,
2757 "fault or invalid emulation. Contact drive vendor for information.\n");
2758                 }
2759         }
2760 
2761         if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2762                 ata_dev_warn(dev, "WARNING: device requires firmware update to be fully functional\n");
2763                 ata_dev_warn(dev, "         contact the vendor or visit http://ata.wiki.kernel.org\n");
2764         }
2765 
2766         return 0;
2767 
2768 err_out_nosup:
2769         if (ata_msg_probe(ap))
2770                 ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2771         return rc;
2772 }
2773 
2774 /**
2775  *      ata_cable_40wire        -       return 40 wire cable type
2776  *      @ap: port
2777  *
2778  *      Helper method for drivers which want to hardwire 40 wire cable
2779  *      detection.
2780  */
2781 
2782 int ata_cable_40wire(struct ata_port *ap)
2783 {
2784         return ATA_CBL_PATA40;
2785 }
2786 
2787 /**
2788  *      ata_cable_80wire        -       return 80 wire cable type
2789  *      @ap: port
2790  *
2791  *      Helper method for drivers which want to hardwire 80 wire cable
2792  *      detection.
2793  */
2794 
2795 int ata_cable_80wire(struct ata_port *ap)
2796 {
2797         return ATA_CBL_PATA80;
2798 }
2799 
2800 /**
2801  *      ata_cable_unknown       -       return unknown PATA cable.
2802  *      @ap: port
2803  *
2804  *      Helper method for drivers which have no PATA cable detection.
2805  */
2806 
2807 int ata_cable_unknown(struct ata_port *ap)
2808 {
2809         return ATA_CBL_PATA_UNK;
2810 }
2811 
2812 /**
2813  *      ata_cable_ignore        -       return ignored PATA cable.
2814  *      @ap: port
2815  *
2816  *      Helper method for drivers which don't use cable type to limit
2817  *      transfer mode.
2818  */
2819 int ata_cable_ignore(struct ata_port *ap)
2820 {
2821         return ATA_CBL_PATA_IGN;
2822 }
2823 
2824 /**
2825  *      ata_cable_sata  -       return SATA cable type
2826  *      @ap: port
2827  *
2828  *      Helper method for drivers which have SATA cables
2829  */
2830 
2831 int ata_cable_sata(struct ata_port *ap)
2832 {
2833         return ATA_CBL_SATA;
2834 }
2835 
2836 /**
2837  *      ata_bus_probe - Reset and probe ATA bus
2838  *      @ap: Bus to probe
2839  *
2840  *      Master ATA bus probing function.  Initiates a hardware-dependent
2841  *      bus reset, then attempts to identify any devices found on
2842  *      the bus.
2843  *
2844  *      LOCKING:
2845  *      PCI/etc. bus probe sem.
2846  *
2847  *      RETURNS:
2848  *      Zero on success, negative errno otherwise.
2849  */
2850 
2851 int ata_bus_probe(struct ata_port *ap)
2852 {
2853         unsigned int classes[ATA_MAX_DEVICES];
2854         int tries[ATA_MAX_DEVICES];
2855         int rc;
2856         struct ata_device *dev;
2857 
2858         ata_for_each_dev(dev, &ap->link, ALL)
2859                 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2860 
2861  retry:
2862         ata_for_each_dev(dev, &ap->link, ALL) {
2863                 /* If we issue an SRST then an ATA drive (not ATAPI)
2864                  * may change configuration and be in PIO0 timing. If
2865                  * we do a hard reset (or are coming from power on)
2866                  * this is true for ATA or ATAPI. Until we've set a
2867                  * suitable controller mode we should not touch the
2868                  * bus as we may be talking too fast.
2869                  */
2870                 dev->pio_mode = XFER_PIO_0;
2871                 dev->dma_mode = 0xff;
2872 
2873                 /* If the controller has a pio mode setup function
2874                  * then use it to set the chipset to rights. Don't
2875                  * touch the DMA setup as that will be dealt with when
2876                  * configuring devices.
2877                  */
2878                 if (ap->ops->set_piomode)
2879                         ap->ops->set_piomode(ap, dev);
2880         }
2881 
2882         /* reset and determine device classes */
2883         ap->ops->phy_reset(ap);
2884 
2885         ata_for_each_dev(dev, &ap->link, ALL) {
2886                 if (dev->class != ATA_DEV_UNKNOWN)
2887                         classes[dev->devno] = dev->class;
2888                 else
2889                         classes[dev->devno] = ATA_DEV_NONE;
2890 
2891                 dev->class = ATA_DEV_UNKNOWN;
2892         }
2893 
2894         /* read IDENTIFY page and configure devices. We have to do the identify
2895            specific sequence bass-ackwards so that PDIAG- is released by
2896            the slave device */
2897 
2898         ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2899                 if (tries[dev->devno])
2900                         dev->class = classes[dev->devno];
2901 
2902                 if (!ata_dev_enabled(dev))
2903                         continue;
2904 
2905                 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2906                                      dev->id);
2907                 if (rc)
2908                         goto fail;
2909         }
2910 
2911         /* Now ask for the cable type as PDIAG- should have been released */
2912         if (ap->ops->cable_detect)
2913                 ap->cbl = ap->ops->cable_detect(ap);
2914 
2915         /* We may have SATA bridge glue hiding here irrespective of
2916          * the reported cable types and sensed types.  When SATA
2917          * drives indicate we have a bridge, we don't know which end
2918          * of the link the bridge is which is a problem.
2919          */
2920         ata_for_each_dev(dev, &ap->link, ENABLED)
2921                 if (ata_id_is_sata(dev->id))
2922                         ap->cbl = ATA_CBL_SATA;
2923 
2924         /* After the identify sequence we can now set up the devices. We do
2925            this in the normal order so that the user doesn't get confused */
2926 
2927         ata_for_each_dev(dev, &ap->link, ENABLED) {
2928                 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2929                 rc = ata_dev_configure(dev);
2930                 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2931                 if (rc)
2932                         goto fail;
2933         }
2934 
2935         /* configure transfer mode */
2936         rc = ata_set_mode(&ap->link, &dev);
2937         if (rc)
2938                 goto fail;
2939 
2940         ata_for_each_dev(dev, &ap->link, ENABLED)
2941                 return 0;
2942 
2943         return -ENODEV;
2944 
2945  fail:
2946         tries[dev->devno]--;
2947 
2948         switch (rc) {
2949         case -EINVAL:
2950                 /* eeek, something went very wrong, give up */
2951                 tries[dev->devno] = 0;
2952                 break;
2953 
2954         case -ENODEV:
2955                 /* give it just one more chance */
2956                 tries[dev->devno] = min(tries[dev->devno], 1);
2957                 /* fall through */
2958         case -EIO:
2959                 if (tries[dev->devno] == 1) {
2960                         /* This is the last chance, better to slow
2961                          * down than lose it.
2962                          */
2963                         sata_down_spd_limit(&ap->link, 0);
2964                         ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2965                 }
2966         }
2967 
2968         if (!tries[dev->devno])
2969                 ata_dev_disable(dev);
2970 
2971         goto retry;
2972 }
2973 
2974 /**
2975  *      sata_print_link_status - Print SATA link status
2976  *      @link: SATA link to printk link status about
2977  *
2978  *      This function prints link speed and status of a SATA link.
2979  *
2980  *      LOCKING:
2981  *      None.
2982  */
2983 static void sata_print_link_status(struct ata_link *link)
2984 {
2985         u32 sstatus, scontrol, tmp;
2986 
2987         if (sata_scr_read(link, SCR_STATUS, &sstatus))
2988                 return;
2989         sata_scr_read(link, SCR_CONTROL, &scontrol);
2990 
2991         if (ata_phys_link_online(link)) {
2992                 tmp = (sstatus >> 4) & 0xf;
2993                 ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
2994                               sata_spd_string(tmp), sstatus, scontrol);
2995         } else {
2996                 ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
2997                               sstatus, scontrol);
2998         }
2999 }
3000 
3001 /**
3002  *      ata_dev_pair            -       return other device on cable
3003  *      @adev: device
3004  *
3005  *      Obtain the other device on the same cable, or if none is
3006  *      present NULL is returned
3007  */
3008 
3009 struct ata_device *ata_dev_pair(struct ata_device *adev)
3010 {
3011         struct ata_link *link = adev->link;
3012         struct ata_device *pair = &link->device[1 - adev->devno];
3013         if (!ata_dev_enabled(pair))
3014                 return NULL;
3015         return pair;
3016 }
3017 
3018 /**
3019  *      sata_down_spd_limit - adjust SATA spd limit downward
3020  *      @link: Link to adjust SATA spd limit for
3021  *      @spd_limit: Additional limit
3022  *
3023  *      Adjust SATA spd limit of @link downward.  Note that this
3024  *      function only adjusts the limit.  The change must be applied
3025  *      using sata_set_spd().
3026  *
3027  *      If @spd_limit is non-zero, the speed is limited to equal to or
3028  *      lower than @spd_limit if such speed is supported.  If
3029  *      @spd_limit is slower than any supported speed, only the lowest
3030  *      supported speed is allowed.
3031  *
3032  *      LOCKING:
3033  *      Inherited from caller.
3034  *
3035  *      RETURNS:
3036  *      0 on success, negative errno on failure
3037  */
3038 int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
3039 {
3040         u32 sstatus, spd, mask;
3041         int rc, bit;
3042 
3043         if (!sata_scr_valid(link))
3044                 return -EOPNOTSUPP;
3045 
3046         /* If SCR can be read, use it to determine the current SPD.
3047          * If not, use cached value in link->sata_spd.
3048          */
3049         rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3050         if (rc == 0 && ata_sstatus_online(sstatus))
3051                 spd = (sstatus >> 4) & 0xf;
3052         else
3053                 spd = link->sata_spd;
3054 
3055         mask = link->sata_spd_limit;
3056         if (mask <= 1)
3057                 return -EINVAL;
3058 
3059         /* unconditionally mask off the highest bit */
3060         bit = fls(mask) - 1;
3061         mask &= ~(1 << bit);
3062 
3063         /*
3064          * Mask off all speeds higher than or equal to the current one.  At
3065          * this point, if current SPD is not available and we previously
3066          * recorded the link speed from SStatus, the driver has already
3067          * masked off the highest bit so mask should already be 1 or 0.
3068          * Otherwise, we should not force 1.5Gbps on a link where we have
3069          * not previously recorded speed from SStatus.  Just return in this
3070          * case.
3071          */
3072         if (spd > 1)
3073                 mask &= (1 << (spd - 1)) - 1;
3074         else
3075                 return -EINVAL;
3076 
3077         /* were we already at the bottom? */
3078         if (!mask)
3079                 return -EINVAL;
3080 
3081         if (spd_limit) {
3082                 if (mask & ((1 << spd_limit) - 1))
3083                         mask &= (1 << spd_limit) - 1;
3084                 else {
3085                         bit = ffs(mask) - 1;
3086                         mask = 1 << bit;
3087                 }
3088         }
3089 
3090         link->sata_spd_limit = mask;
3091 
3092         ata_link_warn(link, "limiting SATA link speed to %s\n",
3093                       sata_spd_string(fls(mask)));
3094 
3095         return 0;
3096 }
3097 
3098 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3099 {
3100         struct ata_link *host_link = &link->ap->link;
3101         u32 limit, target, spd;
3102 
3103         limit = link->sata_spd_limit;
3104 
3105         /* Don't configure downstream link faster than upstream link.
3106          * It doesn't speed up anything and some PMPs choke on such
3107          * configuration.
3108          */
3109         if (!ata_is_host_link(link) && host_link->sata_spd)
3110                 limit &= (1 << host_link->sata_spd) - 1;
3111 
3112         if (limit == UINT_MAX)
3113                 target = 0;
3114         else
3115                 target = fls(limit);
3116 
3117         spd = (*scontrol >> 4) & 0xf;
3118         *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3119 
3120         return spd != target;
3121 }
3122 
3123 /**
3124  *      sata_set_spd_needed - is SATA spd configuration needed
3125  *      @link: Link in question
3126  *
3127  *      Test whether the spd limit in SControl matches
3128  *      @link->sata_spd_limit.  This function is used to determine
3129  *      whether hardreset is necessary to apply SATA spd
3130  *      configuration.
3131  *
3132  *      LOCKING:
3133  *      Inherited from caller.
3134  *
3135  *      RETURNS:
3136  *      1 if SATA spd configuration is needed, 0 otherwise.
3137  */
3138 static int sata_set_spd_needed(struct ata_link *link)
3139 {
3140         u32 scontrol;
3141 
3142         if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3143                 return 1;
3144 
3145         return __sata_set_spd_needed(link, &scontrol);
3146 }
3147 
3148 /**
3149  *      sata_set_spd - set SATA spd according to spd limit
3150  *      @link: Link to set SATA spd for
3151  *
3152  *      Set SATA spd of @link according to sata_spd_limit.
3153  *
3154  *      LOCKING:
3155  *      Inherited from caller.
3156  *
3157  *      RETURNS:
3158  *      0 if spd doesn't need to be changed, 1 if spd has been
3159  *      changed.  Negative errno if SCR registers are inaccessible.
3160  */
3161 int sata_set_spd(struct ata_link *link)
3162 {
3163         u32 scontrol;
3164         int rc;
3165 
3166         if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3167                 return rc;
3168 
3169         if (!__sata_set_spd_needed(link, &scontrol))
3170                 return 0;
3171 
3172         if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3173                 return rc;
3174 
3175         return 1;
3176 }
3177 
3178 /*
3179  * This mode timing computation functionality is ported over from
3180  * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
3181  */
3182 /*
3183  * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
3184  * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3185  * for UDMA6, which is currently supported only by Maxtor drives.
3186  *
3187  * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
3188  */
3189 
3190 static const struct ata_timing ata_timing[] = {
3191 /*      { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0,  960,   0 }, */
3192         { XFER_PIO_0,     70, 290, 240, 600, 165, 150, 0,  600,   0 },
3193         { XFER_PIO_1,     50, 290,  93, 383, 125, 100, 0,  383,   0 },
3194         { XFER_PIO_2,     30, 290,  40, 330, 100,  90, 0,  240,   0 },
3195         { XFER_PIO_3,     30,  80,  70, 180,  80,  70, 0,  180,   0 },
3196         { XFER_PIO_4,     25,  70,  25, 120,  70,  25, 0,  120,   0 },
3197         { XFER_PIO_5,     15,  65,  25, 100,  65,  25, 0,  100,   0 },
3198         { XFER_PIO_6,     10,  55,  20,  80,  55,  20, 0,   80,   0 },
3199 
3200         { XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 50, 960,   0 },
3201         { XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 30, 480,   0 },
3202         { XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 20, 240,   0 },
3203 
3204         { XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 20, 480,   0 },
3205         { XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 5,  150,   0 },
3206         { XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 5,  120,   0 },
3207         { XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 5,  100,   0 },
3208         { XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20, 5,   80,   0 },
3209 
3210 /*      { XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0, 0,    0, 150 }, */
3211         { XFER_UDMA_0,     0,   0,   0,   0,   0,   0, 0,    0, 120 },
3212         { XFER_UDMA_1,     0,   0,   0,   0,   0,   0, 0,    0,  80 },
3213         { XFER_UDMA_2,     0,   0,   0,   0,   0,   0, 0,    0,  60 },
3214         { XFER_UDMA_3,     0,   0,   0,   0,   0,   0, 0,    0,  45 },
3215         { XFER_UDMA_4,     0,   0,   0,   0,   0,   0, 0,    0,  30 },
3216         { XFER_UDMA_5,     0,   0,   0,   0,   0,   0, 0,    0,  20 },
3217         { XFER_UDMA_6,     0,   0,   0,   0,   0,   0, 0,    0,  15 },
3218 
3219         { 0xFF }
3220 };
3221 
3222 #define ENOUGH(v, unit)         (((v)-1)/(unit)+1)
3223 #define EZ(v, unit)             ((v)?ENOUGH(((v) * 1000), unit):0)
3224 
3225 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
3226 {
3227         q->setup        = EZ(t->setup,       T);
3228         q->act8b        = EZ(t->act8b,       T);
3229         q->rec8b        = EZ(t->rec8b,       T);
3230         q->cyc8b        = EZ(t->cyc8b,       T);
3231         q->active       = EZ(t->active,      T);
3232         q->recover      = EZ(t->recover,     T);
3233         q->dmack_hold   = EZ(t->dmack_hold,  T);
3234         q->cycle        = EZ(t->cycle,       T);
3235         q->udma         = EZ(t->udma,       UT);
3236 }
3237 
3238 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
3239                       struct ata_timing *m, unsigned int what)
3240 {
3241         if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
3242         if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
3243         if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
3244         if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
3245         if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
3246         if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
3247         if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
3248         if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
3249         if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
3250 }
3251 
3252 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
3253 {
3254         const struct ata_timing *t = ata_timing;
3255 
3256         while (xfer_mode > t->mode)
3257                 t++;
3258 
3259         if (xfer_mode == t->mode)
3260                 return t;
3261 
3262         WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
3263                         __func__, xfer_mode);
3264 
3265         return NULL;
3266 }
3267 
3268 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
3269                        struct ata_timing *t, int T, int UT)
3270 {
3271         const u16 *id = adev->id;
3272         const struct ata_timing *s;
3273         struct ata_timing p;
3274 
3275         /*
3276          * Find the mode.
3277          */
3278 
3279         if (!(s = ata_timing_find_mode(speed)))
3280                 return -EINVAL;
3281 
3282         memcpy(t, s, sizeof(*s));
3283 
3284         /*
3285          * If the drive is an EIDE drive, it can tell us it needs extended
3286          * PIO/MW_DMA cycle timing.
3287          */
3288 
3289         if (id[ATA_ID_FIELD_VALID] & 2) {       /* EIDE drive */
3290                 memset(&p, 0, sizeof(p));
3291 
3292                 if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
3293                         if (speed <= XFER_PIO_2)
3294                                 p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
3295                         else if ((speed <= XFER_PIO_4) ||
3296                                  (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
3297                                 p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
3298                 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
3299                         p.cycle = id[ATA_ID_EIDE_DMA_MIN];
3300 
3301                 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
3302         }
3303 
3304         /*
3305          * Convert the timing to bus clock counts.
3306          */
3307 
3308         ata_timing_quantize(t, t, T, UT);
3309 
3310         /*
3311          * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
3312          * S.M.A.R.T * and some other commands. We have to ensure that the
3313          * DMA cycle timing is slower/equal than the fastest PIO timing.
3314          */
3315 
3316         if (speed > XFER_PIO_6) {
3317                 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
3318                 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
3319         }
3320 
3321         /*
3322          * Lengthen active & recovery time so that cycle time is correct.
3323          */
3324 
3325         if (t->act8b + t->rec8b < t->cyc8b) {
3326                 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
3327                 t->rec8b = t->cyc8b - t->act8b;
3328         }
3329 
3330         if (t->active + t->recover < t->cycle) {
3331                 t->active += (t->cycle - (t->active + t->recover)) / 2;
3332                 t->recover = t->cycle - t->active;
3333         }
3334 
3335         /* In a few cases quantisation may produce enough errors to
3336            leave t->cycle too low for the sum of active and recovery
3337            if so we must correct this */
3338         if (t->active + t->recover > t->cycle)
3339                 t->cycle = t->active + t->recover;
3340 
3341         return 0;
3342 }
3343 
3344 /**
3345  *      ata_timing_cycle2mode - find xfer mode for the specified cycle duration
3346  *      @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3347  *      @cycle: cycle duration in ns
3348  *
3349  *      Return matching xfer mode for @cycle.  The returned mode is of
3350  *      the transfer type specified by @xfer_shift.  If @cycle is too
3351  *      slow for @xfer_shift, 0xff is returned.  If @cycle is faster
3352  *      than the fastest known mode, the fasted mode is returned.
3353  *
3354  *      LOCKING:
3355  *      None.
3356  *
3357  *      RETURNS:
3358  *      Matching xfer_mode, 0xff if no match found.
3359  */
3360 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3361 {
3362         u8 base_mode = 0xff, last_mode = 0xff;
3363         const struct ata_xfer_ent *ent;
3364         const struct ata_timing *t;
3365 
3366         for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3367                 if (ent->shift == xfer_shift)
3368                         base_mode = ent->base;
3369 
3370         for (t = ata_timing_find_mode(base_mode);
3371              t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3372                 unsigned short this_cycle;
3373 
3374                 switch (xfer_shift) {
3375                 case ATA_SHIFT_PIO:
3376                 case ATA_SHIFT_MWDMA:
3377                         this_cycle = t->cycle;
3378                         break;
3379                 case ATA_SHIFT_UDMA:
3380                         this_cycle = t->udma;
3381                         break;
3382                 default:
3383                         return 0xff;
3384                 }
3385 
3386                 if (cycle > this_cycle)
3387                         break;
3388 
3389                 last_mode = t->mode;
3390         }
3391 
3392         return last_mode;
3393 }
3394 
3395 /**
3396  *      ata_down_xfermask_limit - adjust dev xfer masks downward
3397  *      @dev: Device to adjust xfer masks
3398  *      @sel: ATA_DNXFER_* selector
3399  *
3400  *      Adjust xfer masks of @dev downward.  Note that this function
3401  *      does not apply the change.  Invoking ata_set_mode() afterwards
3402  *      will apply the limit.
3403  *
3404  *      LOCKING:
3405  *      Inherited from caller.
3406  *
3407  *      RETURNS:
3408  *      0 on success, negative errno on failure
3409  */
3410 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3411 {
3412         char buf[32];
3413         unsigned long orig_mask, xfer_mask;
3414         unsigned long pio_mask, mwdma_mask, udma_mask;
3415         int quiet, highbit;
3416 
3417         quiet = !!(sel & ATA_DNXFER_QUIET);
3418         sel &= ~ATA_DNXFER_QUIET;
3419 
3420         xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3421                                                   dev->mwdma_mask,
3422                                                   dev->udma_mask);
3423         ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3424 
3425         switch (sel) {
3426         case ATA_DNXFER_PIO:
3427                 highbit = fls(pio_mask) - 1;
3428                 pio_mask &= ~(1 << highbit);
3429                 break;
3430 
3431         case ATA_DNXFER_DMA:
3432                 if (udma_mask) {
3433                         highbit = fls(udma_mask) - 1;
3434                         udma_mask &= ~(1 << highbit);
3435                         if (!udma_mask)
3436                                 return -ENOENT;
3437                 } else if (mwdma_mask) {
3438                         highbit = fls(mwdma_mask) - 1;
3439                         mwdma_mask &= ~(1 << highbit);
3440                         if (!mwdma_mask)
3441                                 return -ENOENT;
3442                 }
3443                 break;
3444 
3445         case ATA_DNXFER_40C:
3446                 udma_mask &= ATA_UDMA_MASK_40C;
3447                 break;
3448 
3449         case ATA_DNXFER_FORCE_PIO0:
3450                 pio_mask &= 1;
3451                 /* fall through */
3452         case ATA_DNXFER_FORCE_PIO:
3453                 mwdma_mask = 0;
3454                 udma_mask = 0;
3455                 break;
3456 
3457         default:
3458                 BUG();
3459         }
3460 
3461         xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3462 
3463         if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3464                 return -ENOENT;
3465 
3466         if (!quiet) {
3467                 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3468                         snprintf(buf, sizeof(buf), "%s:%s",
3469                                  ata_mode_string(xfer_mask),
3470                                  ata_mode_string(xfer_mask & ATA_MASK_PIO));
3471                 else
3472                         snprintf(buf, sizeof(buf), "%s",
3473                                  ata_mode_string(xfer_mask));
3474 
3475                 ata_dev_warn(dev, "limiting speed to %s\n", buf);
3476         }
3477 
3478         ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3479                             &dev->udma_mask);
3480 
3481         return 0;
3482 }
3483 
3484 static int ata_dev_set_mode(struct ata_device *dev)
3485 {
3486         struct ata_port *ap = dev->link->ap;
3487         struct ata_eh_context *ehc = &dev->link->eh_context;
3488         const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3489         const char *dev_err_whine = "";
3490         int ign_dev_err = 0;
3491         unsigned int err_mask = 0;
3492         int rc;
3493 
3494         dev->flags &= ~ATA_DFLAG_PIO;
3495         if (dev->xfer_shift == ATA_SHIFT_PIO)
3496                 dev->flags |= ATA_DFLAG_PIO;
3497 
3498         if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
3499                 dev_err_whine = " (SET_XFERMODE skipped)";
3500         else {
3501                 if (nosetxfer)
3502                         ata_dev_warn(dev,
3503                                      "NOSETXFER but PATA detected - can't "
3504                                      "skip SETXFER, might malfunction\n");
3505                 err_mask = ata_dev_set_xfermode(dev);
3506         }
3507 
3508         if (err_mask & ~AC_ERR_DEV)
3509                 goto fail;
3510 
3511         /* revalidate */
3512         ehc->i.flags |= ATA_EHI_POST_SETMODE;
3513         rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3514         ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3515         if (rc)
3516                 return rc;
3517 
3518         if (dev->xfer_shift == ATA_SHIFT_PIO) {
3519                 /* Old CFA may refuse this command, which is just fine */
3520                 if (ata_id_is_cfa(dev->id))
3521                         ign_dev_err = 1;
3522                 /* Catch several broken garbage emulations plus some pre
3523                    ATA devices */
3524                 if (ata_id_major_version(dev->id) == 0 &&
3525                                         dev->pio_mode <= XFER_PIO_2)
3526                         ign_dev_err = 1;
3527                 /* Some very old devices and some bad newer ones fail
3528                    any kind of SET_XFERMODE request but support PIO0-2
3529                    timings and no IORDY */
3530                 if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3531                         ign_dev_err = 1;
3532         }
3533         /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3534            Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3535         if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3536             dev->dma_mode == XFER_MW_DMA_0 &&
3537             (dev->id[63] >> 8) & 1)
3538                 ign_dev_err = 1;
3539 
3540         /* if the device is actually configured correctly, ignore dev err */
3541         if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3542                 ign_dev_err = 1;
3543 
3544         if (err_mask & AC_ERR_DEV) {
3545                 if (!ign_dev_err)
3546                         goto fail;
3547                 else
3548                         dev_err_whine = " (device error ignored)";
3549         }
3550 
3551         DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3552                 dev->xfer_shift, (int)dev->xfer_mode);
3553 
3554         if (!(ehc->i.flags & ATA_EHI_QUIET) ||
3555             ehc->i.flags & ATA_EHI_DID_HARDRESET)
3556                 ata_dev_info(dev, "configured for %s%s\n",
3557                              ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3558                              dev_err_whine);
3559 
3560         return 0;
3561 
3562  fail:
3563         ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3564         return -EIO;
3565 }
3566 
3567 /**
3568  *      ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3569  *      @link: link on which timings will be programmed
3570  *      @r_failed_dev: out parameter for failed device
3571  *
3572  *      Standard implementation of the function used to tune and set
3573  *      ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
3574  *      ata_dev_set_mode() fails, pointer to the failing device is
3575  *      returned in @r_failed_dev.
3576  *
3577  *      LOCKING:
3578  *      PCI/etc. bus probe sem.
3579  *
3580  *      RETURNS:
3581  *      0 on success, negative errno otherwise
3582  */
3583 
3584 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3585 {
3586         struct ata_port *ap = link->ap;
3587         struct ata_device *dev;
3588         int rc = 0, used_dma = 0, found = 0;
3589 
3590         /* step 1: calculate xfer_mask */
3591         ata_for_each_dev(dev, link, ENABLED) {
3592                 unsigned long pio_mask, dma_mask;
3593                 unsigned int mode_mask;
3594 
3595                 mode_mask = ATA_DMA_MASK_ATA;
3596                 if (dev->class == ATA_DEV_ATAPI)
3597                         mode_mask = ATA_DMA_MASK_ATAPI;
3598                 else if (ata_id_is_cfa(dev->id))
3599                         mode_mask = ATA_DMA_MASK_CFA;
3600 
3601                 ata_dev_xfermask(dev);
3602                 ata_force_xfermask(dev);
3603 
3604                 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3605 
3606                 if (libata_dma_mask & mode_mask)
3607                         dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
3608                                                      dev->udma_mask);
3609                 else
3610                         dma_mask = 0;
3611 
3612                 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3613                 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3614 
3615                 found = 1;
3616                 if (ata_dma_enabled(dev))
3617                         used_dma = 1;
3618         }
3619         if (!found)
3620                 goto out;
3621 
3622         /* step 2: always set host PIO timings */
3623         ata_for_each_dev(dev, link, ENABLED) {
3624                 if (dev->pio_mode == 0xff) {
3625                         ata_dev_warn(dev, "no PIO support\n");
3626                         rc = -EINVAL;
3627                         goto out;
3628                 }
3629 
3630                 dev->xfer_mode = dev->pio_mode;
3631                 dev->xfer_shift = ATA_SHIFT_PIO;
3632                 if (ap->ops->set_piomode)
3633                         ap->ops->set_piomode(ap, dev);
3634         }
3635 
3636         /* step 3: set host DMA timings */
3637         ata_for_each_dev(dev, link, ENABLED) {
3638                 if (!ata_dma_enabled(dev))
3639                         continue;
3640 
3641                 dev->xfer_mode = dev->dma_mode;
3642                 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3643                 if (ap->ops->set_dmamode)
3644                         ap->ops->set_dmamode(ap, dev);
3645         }
3646 
3647         /* step 4: update devices' xfer mode */
3648         ata_for_each_dev(dev, link, ENABLED) {
3649                 rc = ata_dev_set_mode(dev);
3650                 if (rc)
3651                         goto out;
3652         }
3653 
3654         /* Record simplex status. If we selected DMA then the other
3655          * host channels are not permitted to do so.
3656          */
3657         if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3658                 ap->host->simplex_claimed = ap;
3659 
3660  out:
3661         if (rc)
3662                 *r_failed_dev = dev;
3663         return rc;
3664 }
3665 
3666 /**
3667  *      ata_wait_ready - wait for link to become ready
3668  *      @link: link to be waited on
3669  *      @deadline: deadline jiffies for the operation
3670  *      @check_ready: callback to check link readiness
3671  *
3672  *      Wait for @link to become ready.  @check_ready should return
3673  *      positive number if @link is ready, 0 if it isn't, -ENODEV if
3674  *      link doesn't seem to be occupied, other errno for other error
3675  *      conditions.
3676  *
3677  *      Transient -ENODEV conditions are allowed for
3678  *      ATA_TMOUT_FF_WAIT.
3679  *
3680  *      LOCKING:
3681  *      EH context.
3682  *
3683  *      RETURNS:
3684  *      0 if @link is ready before @deadline; otherwise, -errno.
3685  */
3686 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3687                    int (*check_ready)(struct ata_link *link))
3688 {
3689         unsigned long start = jiffies;
3690         unsigned long nodev_deadline;
3691         int warned = 0;
3692 
3693         /* choose which 0xff timeout to use, read comment in libata.h */
3694         if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
3695                 nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
3696         else
3697                 nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3698 
3699         /* Slave readiness can't be tested separately from master.  On
3700          * M/S emulation configuration, this function should be called
3701          * only on the master and it will handle both master and slave.
3702          */
3703         WARN_ON(link == link->ap->slave_link);
3704 
3705         if (time_after(nodev_deadline, deadline))
3706                 nodev_deadline = deadline;
3707 
3708         while (1) {
3709                 unsigned long now = jiffies;
3710                 int ready, tmp;
3711 
3712                 ready = tmp = check_ready(link);
3713                 if (ready > 0)
3714                         return 0;
3715 
3716                 /*
3717                  * -ENODEV could be transient.  Ignore -ENODEV if link
3718                  * is online.  Also, some SATA devices take a long
3719                  * time to clear 0xff after reset.  Wait for
3720                  * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
3721                  * offline.
3722                  *
3723                  * Note that some PATA controllers (pata_ali) explode
3724                  * if status register is read more than once when
3725                  * there's no device attached.
3726                  */
3727                 if (ready == -ENODEV) {
3728                         if (ata_link_online(link))
3729                                 ready = 0;
3730                         else if ((link->ap->flags & ATA_FLAG_SATA) &&
3731                                  !ata_link_offline(link) &&
3732                                  time_before(now, nodev_deadline))
3733                                 ready = 0;
3734                 }
3735 
3736                 if (ready)
3737                         return ready;
3738                 if (time_after(now, deadline))
3739                         return -EBUSY;
3740 
3741                 if (!warned && time_after(now, start + 5 * HZ) &&
3742                     (deadline - now > 3 * HZ)) {
3743                         ata_link_warn(link,
3744                                 "link is slow to respond, please be patient "
3745                                 "(ready=%d)\n", tmp);
3746                         warned = 1;
3747                 }
3748 
3749                 ata_msleep(link->ap, 50);
3750         }
3751 }
3752 
3753 /**
3754  *      ata_wait_after_reset - wait for link to become ready after reset
3755  *      @link: link to be waited on
3756  *      @deadline: deadline jiffies for the operation
3757  *      @check_ready: callback to check link readiness
3758  *
3759  *      Wait for @link to become ready after reset.
3760  *
3761  *      LOCKING:
3762  *      EH context.
3763  *
3764  *      RETURNS:
3765  *      0 if @link is ready before @deadline; otherwise, -errno.
3766  */
3767 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3768                                 int (*check_ready)(struct ata_link *link))
3769 {
3770         ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3771 
3772         return ata_wait_ready(link, deadline, check_ready);
3773 }
3774 
3775 /**
3776  *      sata_link_debounce - debounce SATA phy status
3777  *      @link: ATA link to debounce SATA phy status for
3778  *      @params: timing parameters { interval, duration, timeout } in msec
3779  *      @deadline: deadline jiffies for the operation
3780  *
3781  *      Make sure SStatus of @link reaches stable state, determined by
3782  *      holding the same value where DET is not 1 for @duration polled
3783  *      every @interval, before @timeout.  Timeout constraints the
3784  *      beginning of the stable state.  Because DET gets stuck at 1 on
3785  *      some controllers after hot unplugging, this functions waits
3786  *      until timeout then returns 0 if DET is stable at 1.
3787  *
3788  *      @timeout is further limited by @deadline.  The sooner of the
3789  *      two is used.
3790  *
3791  *      LOCKING:
3792  *      Kernel thread context (may sleep)
3793  *
3794  *      RETURNS:
3795  *      0 on success, -errno on failure.
3796  */
3797 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3798                        unsigned long deadline)
3799 {
3800         unsigned long interval = params[0];
3801         unsigned long duration = params[1];
3802         unsigned long last_jiffies, t;
3803         u32 last, cur;
3804         int rc;
3805 
3806         t = ata_deadline(jiffies, params[2]);
3807         if (time_before(t, deadline))
3808                 deadline = t;
3809 
3810         if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3811                 return rc;
3812         cur &= 0xf;
3813 
3814         last = cur;
3815         last_jiffies = jiffies;
3816 
3817         while (1) {
3818                 ata_msleep(link->ap, interval);
3819                 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3820                         return rc;
3821                 cur &= 0xf;
3822 
3823                 /* DET stable? */
3824                 if (cur == last) {
3825                         if (cur == 1 && time_before(jiffies, deadline))
3826                                 continue;
3827                         if (time_after(jiffies,
3828                                        ata_deadline(last_jiffies, duration)))
3829                                 return 0;
3830                         continue;
3831                 }
3832 
3833                 /* unstable, start over */
3834                 last = cur;
3835                 last_jiffies = jiffies;
3836 
3837                 /* Check deadline.  If debouncing failed, return
3838                  * -EPIPE to tell upper layer to lower link speed.
3839                  */
3840                 if (time_after(jiffies, deadline))
3841                         return -EPIPE;
3842         }
3843 }
3844 
3845 /**
3846  *      sata_link_resume - resume SATA link
3847  *      @link: ATA link to resume SATA
3848  *      @params: timing parameters { interval, duration, timeout } in msec
3849  *      @deadline: deadline jiffies for the operation
3850  *
3851  *      Resume SATA phy @link and debounce it.
3852  *
3853  *      LOCKING:
3854  *      Kernel thread context (may sleep)
3855  *
3856  *      RETURNS:
3857  *      0 on success, -errno on failure.
3858  */
3859 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3860                      unsigned long deadline)
3861 {
3862         int tries = ATA_LINK_RESUME_TRIES;
3863         u32 scontrol, serror;
3864         int rc;
3865 
3866         if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3867                 return rc;
3868 
3869         /*
3870          * Writes to SControl sometimes get ignored under certain
3871          * controllers (ata_piix SIDPR).  Make sure DET actually is
3872          * cleared.
3873          */
3874         do {
3875                 scontrol = (scontrol & 0x0f0) | 0x300;
3876                 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3877                         return rc;
3878                 /*
3879                  * Some PHYs react badly if SStatus is pounded
3880                  * immediately after resuming.  Delay 200ms before
3881                  * debouncing.
3882                  */
3883                 if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
3884                         ata_msleep(link->ap, 200);
3885 
3886                 /* is SControl restored correctly? */
3887                 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3888                         return rc;
3889         } while ((scontrol & 0xf0f) != 0x300 && --tries);
3890 
3891         if ((scontrol & 0xf0f) != 0x300) {
3892                 ata_link_warn(link, "failed to resume link (SControl %X)\n",
3893                              scontrol);
3894                 return 0;
3895         }
3896 
3897         if (tries < ATA_LINK_RESUME_TRIES)
3898                 ata_link_warn(link, "link resume succeeded after %d retries\n",
3899                               ATA_LINK_RESUME_TRIES - tries);
3900 
3901         if ((rc = sata_link_debounce(link, params, deadline)))
3902                 return rc;
3903 
3904         /* clear SError, some PHYs require this even for SRST to work */
3905         if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3906                 rc = sata_scr_write(link, SCR_ERROR, serror);
3907 
3908         return rc != -EINVAL ? rc : 0;
3909 }
3910 
3911 /**
3912  *      sata_link_scr_lpm - manipulate SControl IPM and SPM fields
3913  *      @link: ATA link to manipulate SControl for
3914  *      @policy: LPM policy to configure
3915  *      @spm_wakeup: initiate LPM transition to active state
3916  *
3917  *      Manipulate the IPM field of the SControl register of @link
3918  *      according to @policy.  If @policy is ATA_LPM_MAX_POWER and
3919  *      @spm_wakeup is %true, the SPM field is manipulated to wake up
3920  *      the link.  This function also clears PHYRDY_CHG before
3921  *      returning.
3922  *
3923  *      LOCKING:
3924  *      EH context.
3925  *
3926  *      RETURNS:
3927  *      0 on success, -errno otherwise.
3928  */
3929 int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3930                       bool spm_wakeup)
3931 {
3932         struct ata_eh_context *ehc = &link->eh_context;
3933         bool woken_up = false;
3934         u32 scontrol;
3935         int rc;
3936 
3937         rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
3938         if (rc)
3939                 return rc;
3940 
3941         switch (policy) {
3942         case ATA_LPM_MAX_POWER:
3943                 /* disable all LPM transitions */
3944                 scontrol |= (0x7 << 8);
3945                 /* initiate transition to active state */
3946                 if (spm_wakeup) {
3947                         scontrol |= (0x4 << 12);
3948                         woken_up = true;
3949                 }
3950                 break;
3951         case ATA_LPM_MED_POWER:
3952                 /* allow LPM to PARTIAL */
3953                 scontrol &= ~(0x1 << 8);
3954                 scontrol |= (0x6 << 8);
3955                 break;
3956         case ATA_LPM_MED_POWER_WITH_DIPM:
3957         case ATA_LPM_MIN_POWER_WITH_PARTIAL:
3958         case ATA_LPM_MIN_POWER:
3959                 if (ata_link_nr_enabled(link) > 0)
3960                         /* no restrictions on LPM transitions */
3961                         scontrol &= ~(0x7 << 8);
3962                 else {
3963                         /* empty port, power off */
3964                         scontrol &= ~0xf;
3965                         scontrol |= (0x1 << 2);
3966                 }
3967                 break;
3968         default:
3969                 WARN_ON(1);
3970         }
3971 
3972         rc = sata_scr_write(link, SCR_CONTROL, scontrol);
3973         if (rc)
3974                 return rc;
3975 
3976         /* give the link time to transit out of LPM state */
3977         if (woken_up)
3978                 msleep(10);
3979 
3980         /* clear PHYRDY_CHG from SError */
3981         ehc->i.serror &= ~SERR_PHYRDY_CHG;
3982         return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
3983 }
3984 
3985 /**
3986  *      ata_std_prereset - prepare for reset
3987  *      @link: ATA link to be reset
3988  *      @deadline: deadline jiffies for the operation
3989  *
3990  *      @link is about to be reset.  Initialize it.  Failure from
3991  *      prereset makes libata abort whole reset sequence and give up
3992  *      that port, so prereset should be best-effort.  It does its
3993  *      best to prepare for reset sequence but if things go wrong, it
3994  *      should just whine, not fail.
3995  *
3996  *      LOCKING:
3997  *      Kernel thread context (may sleep)
3998  *
3999  *      RETURNS:
4000  *      0 on success, -errno otherwise.
4001  */
4002 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
4003 {
4004         struct ata_port *ap = link->ap;
4005         struct ata_eh_context *ehc = &link->eh_context;
4006         const unsigned long *timing = sata_ehc_deb_timing(ehc);
4007         int rc;
4008 
4009         /* if we're about to do hardreset, nothing more to do */
4010         if (ehc->i.action & ATA_EH_HARDRESET)
4011                 return 0;
4012 
4013         /* if SATA, resume link */
4014         if (ap->flags & ATA_FLAG_SATA) {
4015                 rc = sata_link_resume(link, timing, deadline);
4016                 /* whine about phy resume failure but proceed */
4017                 if (rc && rc != -EOPNOTSUPP)
4018                         ata_link_warn(link,
4019                                       "failed to resume link for reset (errno=%d)\n",
4020                                       rc);
4021         }
4022 
4023         /* no point in trying softreset on offline link */
4024         if (ata_phys_link_offline(link))
4025                 ehc->i.action &= ~ATA_EH_SOFTRESET;
4026 
4027         return 0;
4028 }
4029 
4030 /**
4031  *      sata_link_hardreset - reset link via SATA phy reset
4032  *      @link: link to reset
4033  *      @timing: timing parameters { interval, duration, timeout } in msec
4034  *      @deadline: deadline jiffies for the operation
4035  *      @online: optional out parameter indicating link onlineness
4036  *      @check_ready: optional callback to check link readiness
4037  *
4038  *      SATA phy-reset @link using DET bits of SControl register.
4039  *      After hardreset, link readiness is waited upon using
4040  *      ata_wait_ready() if @check_ready is specified.  LLDs are
4041  *      allowed to not specify @check_ready and wait itself after this
4042  *      function returns.  Device classification is LLD's
4043  *      responsibility.
4044  *
4045  *      *@online is set to one iff reset succeeded and @link is online
4046  *      after reset.
4047  *
4048  *      LOCKING:
4049  *      Kernel thread context (may sleep)
4050  *
4051  *      RETURNS:
4052  *      0 on success, -errno otherwise.
4053  */
4054 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
4055                         unsigned long deadline,
4056                         bool *online, int (*check_ready)(struct ata_link *))
4057 {
4058         u32 scontrol;
4059         int rc;
4060 
4061         DPRINTK("ENTER\n");
4062 
4063         if (online)
4064                 *online = false;
4065 
4066         if (sata_set_spd_needed(link)) {
4067                 /* SATA spec says nothing about how to reconfigure
4068                  * spd.  To be on the safe side, turn off phy during
4069                  * reconfiguration.  This works for at least ICH7 AHCI
4070                  * and Sil3124.
4071                  */
4072                 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
4073                         goto out;
4074 
4075                 scontrol = (scontrol & 0x0f0) | 0x304;
4076 
4077                 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
4078                         goto out;
4079 
4080                 sata_set_spd(link);
4081         }
4082 
4083         /* issue phy wake/reset */
4084         if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
4085                 goto out;
4086 
4087         scontrol = (scontrol & 0x0f0) | 0x301;
4088 
4089         if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
4090                 goto out;
4091 
4092         /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
4093          * 10.4.2 says at least 1 ms.
4094          */
4095         ata_msleep(link->ap, 1);
4096 
4097         /* bring link back */
4098         rc = sata_link_resume(link, timing, deadline);
4099         if (rc)
4100                 goto out;
4101         /* if link is offline nothing more to do */
4102         if (ata_phys_link_offline(link))
4103                 goto out;
4104 
4105         /* Link is online.  From this point, -ENODEV too is an error. */
4106         if (online)
4107                 *online = true;
4108 
4109         if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
4110                 /* If PMP is supported, we have to do follow-up SRST.
4111                  * Some PMPs don't send D2H Reg FIS after hardreset if
4112                  * the first port is empty.  Wait only for
4113                  * ATA_TMOUT_PMP_SRST_WAIT.
4114                  */
4115                 if (check_ready) {
4116                         unsigned long pmp_deadline;
4117 
4118                         pmp_deadline = ata_deadline(jiffies,
4119                                                     ATA_TMOUT_PMP_SRST_WAIT);
4120                         if (time_after(pmp_deadline, deadline))
4121                                 pmp_deadline = deadline;
4122                         ata_wait_ready(link, pmp_deadline, check_ready);
4123                 }
4124                 rc = -EAGAIN;
4125                 goto out;
4126         }
4127 
4128         rc = 0;
4129         if (check_ready)
4130                 rc = ata_wait_ready(link, deadline, check_ready);
4131  out:
4132         if (rc && rc != -EAGAIN) {
4133                 /* online is set iff link is online && reset succeeded */
4134                 if (online)
4135                         *online = false;
4136                 ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
4137         }
4138         DPRINTK("EXIT, rc=%d\n", rc);
4139         return rc;
4140 }
4141 
4142 /**
4143  *      sata_std_hardreset - COMRESET w/o waiting or classification
4144  *      @link: link to reset
4145  *      @class: resulting class of attached device
4146  *      @deadline: deadline jiffies for the operation
4147  *
4148  *      Standard SATA COMRESET w/o waiting or classification.
4149  *
4150  *      LOCKING:
4151  *      Kernel thread context (may sleep)
4152  *
4153  *      RETURNS:
4154  *      0 if link offline, -EAGAIN if link online, -errno on errors.
4155  */
4156 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
4157                        unsigned long deadline)
4158 {
4159         const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
4160         bool online;
4161         int rc;
4162 
4163         /* do hardreset */
4164         rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
4165         return online ? -EAGAIN : rc;
4166 }
4167 
4168 /**
4169  *      ata_std_postreset - standard postreset callback
4170  *      @link: the target ata_link
4171  *      @classes: classes of attached devices
4172  *
4173  *      This function is invoked after a successful reset.  Note that
4174  *      the device might have been reset more than once using
4175  *      different reset methods before postreset is invoked.
4176  *
4177  *      LOCKING:
4178  *      Kernel thread context (may sleep)
4179  */
4180 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
4181 {
4182         u32 serror;
4183 
4184         DPRINTK("ENTER\n");
4185 
4186         /* reset complete, clear SError */
4187         if (!sata_scr_read(link, SCR_ERROR, &serror))
4188                 sata_scr_write(link, SCR_ERROR, serror);
4189 
4190         /* print link status */
4191         sata_print_link_status(link);
4192 
4193         DPRINTK("EXIT\n");
4194 }
4195 
4196 /**
4197  *      ata_dev_same_device - Determine whether new ID matches configured device
4198  *      @dev: device to compare against
4199  *      @new_class: class of the new device
4200  *      @new_id: IDENTIFY page of the new device
4201  *
4202  *      Compare @new_class and @new_id against @dev and determine
4203  *      whether @dev is the device indicated by @new_class and
4204  *      @new_id.
4205  *
4206  *      LOCKING:
4207  *      None.
4208  *
4209  *      RETURNS:
4210  *      1 if @dev matches @new_class and @new_id, 0 otherwise.
4211  */
4212 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
4213                                const u16 *new_id)
4214 {
4215         const u16 *old_id = dev->id;
4216         unsigned char model[2][ATA_ID_PROD_LEN + 1];
4217         unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4218 
4219         if (dev->class != new_class) {
4220                 ata_dev_info(dev, "class mismatch %d != %d\n",
4221                              dev->class, new_class);
4222                 return 0;
4223         }
4224 
4225         ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
4226         ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
4227         ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
4228         ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
4229 
4230         if (strcmp(model[0], model[1])) {
4231                 ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
4232                              model[0], model[1]);
4233                 return 0;
4234         }
4235 
4236         if (strcmp(serial[0], serial[1])) {
4237                 ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
4238                              serial[0], serial[1]);
4239                 return 0;
4240         }
4241 
4242         return 1;
4243 }
4244 
4245 /**
4246  *      ata_dev_reread_id - Re-read IDENTIFY data
4247  *      @dev: target ATA device
4248  *      @readid_flags: read ID flags
4249  *
4250  *      Re-read IDENTIFY page and make sure @dev is still attached to
4251  *      the port.
4252  *
4253  *      LOCKING:
4254  *      Kernel thread context (may sleep)
4255  *
4256  *      RETURNS:
4257  *      0 on success, negative errno otherwise
4258  */
4259 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4260 {
4261         unsigned int class = dev->class;
4262         u16 *id = (void *)dev->link->ap->sector_buf;
4263         int rc;
4264 
4265         /* read ID data */
4266         rc = ata_dev_read_id(dev, &class, readid_flags, id);
4267         if (rc)
4268                 return rc;
4269 
4270         /* is the device still there? */
4271         if (!ata_dev_same_device(dev, class, id))
4272                 return -ENODEV;
4273 
4274         memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4275         return 0;
4276 }
4277 
4278 /**
4279  *      ata_dev_revalidate - Revalidate ATA device
4280  *      @dev: device to revalidate
4281  *      @new_class: new class code
4282  *      @readid_flags: read ID flags
4283  *
4284  *      Re-read IDENTIFY page, make sure @dev is still attached to the
4285  *      port and reconfigure it according to the new IDENTIFY page.
4286  *
4287  *      LOCKING:
4288  *      Kernel thread context (may sleep)
4289  *
4290  *      RETURNS:
4291  *      0 on success, negative errno otherwise
4292  */
4293 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4294                        unsigned int readid_flags)
4295 {
4296         u64 n_sectors = dev->n_sectors;
4297         u64 n_native_sectors = dev->n_native_sectors;
4298         int rc;
4299 
4300         if (!ata_dev_enabled(dev))
4301                 return -ENODEV;
4302 
4303         /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4304         if (ata_class_enabled(new_class) &&
4305             new_class != ATA_DEV_ATA &&
4306             new_class != ATA_DEV_ATAPI &&
4307             new_class != ATA_DEV_ZAC &&
4308             new_class != ATA_DEV_SEMB) {
4309                 ata_dev_info(dev, "class mismatch %u != %u\n",
4310                              dev->class, new_class);
4311                 rc = -ENODEV;
4312                 goto fail;
4313         }
4314 
4315         /* re-read ID */
4316         rc = ata_dev_reread_id(dev, readid_flags);
4317         if (rc)
4318                 goto fail;
4319 
4320         /* configure device according to the new ID */
4321         rc = ata_dev_configure(dev);
4322         if (rc)
4323                 goto fail;
4324 
4325         /* verify n_sectors hasn't changed */
4326         if (dev->class != ATA_DEV_ATA || !n_sectors ||
4327             dev->n_sectors == n_sectors)
4328                 return 0;
4329 
4330         /* n_sectors has changed */
4331         ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
4332                      (unsigned long long)n_sectors,
4333                      (unsigned long long)dev->n_sectors);
4334 
4335         /*
4336          * Something could have caused HPA to be unlocked
4337          * involuntarily.  If n_native_sectors hasn't changed and the
4338          * new size matches it, keep the device.
4339          */
4340         if (dev->n_native_sectors == n_native_sectors &&
4341             dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
4342                 ata_dev_warn(dev,
4343                              "new n_sectors matches native, probably "
4344                              "late HPA unlock, n_sectors updated\n");
4345                 /* use the larger n_sectors */
4346                 return 0;
4347         }
4348 
4349         /*
4350          * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
4351          * unlocking HPA in those cases.
4352          *
4353          * https://bugzilla.kernel.org/show_bug.cgi?id=15396
4354          */
4355         if (dev->n_native_sectors == n_native_sectors &&
4356             dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
4357             !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
4358                 ata_dev_warn(dev,
4359                              "old n_sectors matches native, probably "
4360                              "late HPA lock, will try to unlock HPA\n");
4361                 /* try unlocking HPA */
4362                 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
4363                 rc = -EIO;
4364         } else
4365                 rc = -ENODEV;
4366 
4367         /* restore original n_[native_]sectors and fail */
4368         dev->n_native_sectors = n_native_sectors;
4369         dev->n_sectors = n_sectors;
4370  fail:
4371         ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4372         return rc;
4373 }
4374 
4375 struct ata_blacklist_entry {
4376         const char *model_num;
4377         const char *model_rev;
4378         unsigned long horkage;
4379 };
4380 
4381 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4382         /* Devices with DMA related problems under Linux */
4383         { "WDC AC11000H",       NULL,           ATA_HORKAGE_NODMA },
4384         { "WDC AC22100H",       NULL,           ATA_HORKAGE_NODMA },
4385         { "WDC AC32500H",       NULL,           ATA_HORKAGE_NODMA },
4386         { "WDC AC33100H",       NULL,           ATA_HORKAGE_NODMA },
4387         { "WDC AC31600H",       NULL,           ATA_HORKAGE_NODMA },
4388         { "WDC AC32100H",       "24.09P07",     ATA_HORKAGE_NODMA },
4389         { "WDC AC23200L",       "21.10N21",     ATA_HORKAGE_NODMA },
4390         { "Compaq CRD-8241B",   NULL,           ATA_HORKAGE_NODMA },
4391         { "CRD-8400B",          NULL,           ATA_HORKAGE_NODMA },
4392         { "CRD-848[02]B",       NULL,           ATA_HORKAGE_NODMA },
4393         { "CRD-84",             NULL,           ATA_HORKAGE_NODMA },
4394         { "SanDisk SDP3B",      NULL,           ATA_HORKAGE_NODMA },
4395         { "SanDisk SDP3B-64",   NULL,           ATA_HORKAGE_NODMA },
4396         { "SANYO CD-ROM CRD",   NULL,           ATA_HORKAGE_NODMA },
4397         { "HITACHI CDR-8",      NULL,           ATA_HORKAGE_NODMA },
4398         { "HITACHI CDR-8[34]35",NULL,           ATA_HORKAGE_NODMA },
4399         { "Toshiba CD-ROM XM-6202B", NULL,      ATA_HORKAGE_NODMA },
4400         { "TOSHIBA CD-ROM XM-1702BC", NULL,     ATA_HORKAGE_NODMA },
4401         { "CD-532E-A",          NULL,           ATA_HORKAGE_NODMA },
4402         { "E-IDE CD-ROM CR-840",NULL,           ATA_HORKAGE_NODMA },
4403         { "CD-ROM Drive/F5A",   NULL,           ATA_HORKAGE_NODMA },
4404         { "WPI CDD-820",        NULL,           ATA_HORKAGE_NODMA },
4405         { "SAMSUNG CD-ROM SC-148C", NULL,       ATA_HORKAGE_NODMA },
4406         { "SAMSUNG CD-ROM SC",  NULL,           ATA_HORKAGE_NODMA },
4407         { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4408         { "_NEC DV5800A",       NULL,           ATA_HORKAGE_NODMA },
4409         { "SAMSUNG CD-ROM SN-124", "N001",      ATA_HORKAGE_NODMA },
4410         { "Seagate STT20000A", NULL,            ATA_HORKAGE_NODMA },
4411         { " 2GB ATA Flash Disk", "ADMA428M",    ATA_HORKAGE_NODMA },
4412         { "VRFDFC22048UCHC-TE*", NULL,          ATA_HORKAGE_NODMA },
4413         /* Odd clown on sil3726/4726 PMPs */
4414         { "Config  Disk",       NULL,           ATA_HORKAGE_DISABLE },
4415 
4416         /* Weird ATAPI devices */
4417         { "TORiSAN DVD-ROM DRD-N216", NULL,     ATA_HORKAGE_MAX_SEC_128 },
4418         { "QUANTUM DAT    DAT72-000", NULL,     ATA_HORKAGE_ATAPI_MOD16_DMA },
4419         { "Slimtype DVD A  DS8A8SH", NULL,      ATA_HORKAGE_MAX_SEC_LBA48 },
4420         { "Slimtype DVD A  DS8A9SH", NULL,      ATA_HORKAGE_MAX_SEC_LBA48 },
4421 
4422         /*
4423          * Causes silent data corruption with higher max sects.
4424          * http://lkml.kernel.org/g/x49wpy40ysk.fsf@segfault.boston.devel.redhat.com
4425          */
4426         { "ST380013AS",         "3.20",         ATA_HORKAGE_MAX_SEC_1024 },
4427 
4428         /*
4429          * These devices time out with higher max sects.
4430          * https://bugzilla.kernel.org/show_bug.cgi?id=121671
4431          */
4432         { "LITEON CX1-JB*-HP",  NULL,           ATA_HORKAGE_MAX_SEC_1024 },
4433         { "LITEON EP1-*",       NULL,           ATA_HORKAGE_MAX_SEC_1024 },
4434 
4435         /* Devices we expect to fail diagnostics */
4436 
4437         /* Devices where NCQ should be avoided */
4438         /* NCQ is slow */
4439         { "WDC WD740ADFD-00",   NULL,           ATA_HORKAGE_NONCQ },
4440         { "WDC WD740ADFD-00NLR1", NULL,         ATA_HORKAGE_NONCQ, },
4441         /* http://thread.gmane.org/gmane.linux.ide/14907 */
4442         { "FUJITSU MHT2060BH",  NULL,           ATA_HORKAGE_NONCQ },
4443         /* NCQ is broken */
4444         { "Maxtor *",           "BANC*",        ATA_HORKAGE_NONCQ },
4445         { "Maxtor 7V300F0",     "VA111630",     ATA_HORKAGE_NONCQ },
4446         { "ST380817AS",         "3.42",         ATA_HORKAGE_NONCQ },
4447         { "ST3160023AS",        "3.42",         ATA_HORKAGE_NONCQ },
4448         { "OCZ CORE_SSD",       "02.10104",     ATA_HORKAGE_NONCQ },
4449 
4450         /* Seagate NCQ + FLUSH CACHE firmware bug */
4451         { "ST31500341AS",       "SD1[5-9]",     ATA_HORKAGE_NONCQ |
4452                                                 ATA_HORKAGE_FIRMWARE_WARN },
4453 
4454         { "ST31000333AS",       "SD1[5-9]",     ATA_HORKAGE_NONCQ |
4455                                                 ATA_HORKAGE_FIRMWARE_WARN },
4456 
4457         { "ST3640[36]23AS",     "SD1[5-9]",     ATA_HORKAGE_NONCQ |
4458                                                 ATA_HORKAGE_FIRMWARE_WARN },
4459 
4460         { "ST3320[68]13AS",     "SD1[5-9]",     ATA_HORKAGE_NONCQ |
4461                                                 ATA_HORKAGE_FIRMWARE_WARN },
4462 
4463         /* drives which fail FPDMA_AA activation (some may freeze afterwards)
4464            the ST disks also have LPM issues */
4465         { "ST1000LM024 HN-M101MBB", NULL,       ATA_HORKAGE_BROKEN_FPDMA_AA |
4466                                                 ATA_HORKAGE_NOLPM, },
4467         { "VB0250EAVER",        "HPG7",         ATA_HORKAGE_BROKEN_FPDMA_AA },
4468 
4469         /* Blacklist entries taken from Silicon Image 3124/3132
4470            Windows driver .inf file - also several Linux problem reports */
4471         { "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
4472         { "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
4473         { "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
4474 
4475         /* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
4476         { "C300-CTFDDAC128MAG", "0001",         ATA_HORKAGE_NONCQ, },
4477 
4478         /* Some Sandisk SSDs lock up hard with NCQ enabled.  Reported on
4479            SD7SN6S256G and SD8SN8U256G */
4480         { "SanDisk SD[78]SN*G", NULL,           ATA_HORKAGE_NONCQ, },
4481 
4482         /* devices which puke on READ_NATIVE_MAX */
4483         { "HDS724040KLSA80",    "KFAOA20N",     ATA_HORKAGE_BROKEN_HPA, },
4484         { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4485         { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4486         { "MAXTOR 6L080L4",     "A93.0500",     ATA_HORKAGE_BROKEN_HPA },
4487 
4488         /* this one allows HPA unlocking but fails IOs on the area */
4489         { "OCZ-VERTEX",             "1.30",     ATA_HORKAGE_BROKEN_HPA },
4490 
4491         /* Devices which report 1 sector over size HPA */
4492         { "ST340823A",          NULL,           ATA_HORKAGE_HPA_SIZE, },
4493         { "ST320413A",          NULL,           ATA_HORKAGE_HPA_SIZE, },
4494         { "ST310211A",          NULL,           ATA_HORKAGE_HPA_SIZE, },
4495 
4496         /* Devices which get the IVB wrong */
4497         { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4498         /* Maybe we should just blacklist TSSTcorp... */
4499         { "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
4500 
4501         /* Devices that do not need bridging limits applied */
4502         { "MTRON MSP-SATA*",            NULL,   ATA_HORKAGE_BRIDGE_OK, },
4503         { "BUFFALO HD-QSU2/R5",         NULL,   ATA_HORKAGE_BRIDGE_OK, },
4504 
4505         /* Devices which aren't very happy with higher link speeds */
4506         { "WD My Book",                 NULL,   ATA_HORKAGE_1_5_GBPS, },
4507         { "Seagate FreeAgent GoFlex",   NULL,   ATA_HORKAGE_1_5_GBPS, },
4508 
4509         /*
4510          * Devices which choke on SETXFER.  Applies only if both the
4511          * device and controller are SATA.
4512          */
4513         { "PIONEER DVD-RW  DVRTD08",    NULL,   ATA_HORKAGE_NOSETXFER },
4514         { "PIONEER DVD-RW  DVRTD08A",   NULL,   ATA_HORKAGE_NOSETXFER },
4515         { "PIONEER DVD-RW  DVR-215",    NULL,   ATA_HORKAGE_NOSETXFER },
4516         { "PIONEER DVD-RW  DVR-212D",   NULL,   ATA_HORKAGE_NOSETXFER },
4517         { "PIONEER DVD-RW  DVR-216D",   NULL,   ATA_HORKAGE_NOSETXFER },
4518 
4519         /* Crucial BX100 SSD 500GB has broken LPM support */
4520         { "CT500BX100SSD1",             NULL,   ATA_HORKAGE_NOLPM },
4521 
4522         /* 512GB MX100 with MU01 firmware has both queued TRIM and LPM issues */
4523         { "Crucial_CT512MX100*",        "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4524                                                 ATA_HORKAGE_ZERO_AFTER_TRIM |
4525                                                 ATA_HORKAGE_NOLPM, },
4526         /* 512GB MX100 with newer firmware has only LPM issues */
4527         { "Crucial_CT512MX100*",        NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM |
4528                                                 ATA_HORKAGE_NOLPM, },
4529 
4530         /* 480GB+ M500 SSDs have both queued TRIM and LPM issues */
4531         { "Crucial_CT480M500*",         NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4532                                                 ATA_HORKAGE_ZERO_AFTER_TRIM |
4533                                                 ATA_HORKAGE_NOLPM, },
4534         { "Crucial_CT960M500*",         NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4535                                                 ATA_HORKAGE_ZERO_AFTER_TRIM |
4536                                                 ATA_HORKAGE_NOLPM, },
4537 
4538         /* These specific Samsung models/firmware-revs do not handle LPM well */
4539         { "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM, },
4540         { "SAMSUNG SSD PM830 mSATA *",  "CXM13D1Q", ATA_HORKAGE_NOLPM, },
4541         { "SAMSUNG MZ7TD256HAFV-000L9", NULL,       ATA_HORKAGE_NOLPM, },
4542         { "SAMSUNG MZ7TE512HMHP-000L1", "EXT06L0Q", ATA_HORKAGE_NOLPM, },
4543 
4544         /* devices that don't properly handle queued TRIM commands */
4545         { "Micron_M500IT_*",            "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4546                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4547         { "Micron_M500_*",              NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4548                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4549         { "Crucial_CT*M500*",           NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4550                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4551         { "Micron_M5[15]0_*",           "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4552                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4553         { "Crucial_CT*M550*",           "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4554                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4555         { "Crucial_CT*MX100*",          "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4556                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4557         { "Samsung SSD 840*",           NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4558                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4559         { "Samsung SSD 850*",           NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4560                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4561         { "FCCT*M500*",                 NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
4562                                                 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4563 
4564         /* devices that don't properly handle TRIM commands */
4565         { "SuperSSpeed S238*",          NULL,   ATA_HORKAGE_NOTRIM, },
4566 
4567         /*
4568          * As defined, the DRAT (Deterministic Read After Trim) and RZAT
4569          * (Return Zero After Trim) flags in the ATA Command Set are
4570          * unreliable in the sense that they only define what happens if
4571          * the device successfully executed the DSM TRIM command. TRIM
4572          * is only advisory, however, and the device is free to silently
4573          * ignore all or parts of the request.
4574          *
4575          * Whitelist drives that are known to reliably return zeroes
4576          * after TRIM.
4577          */
4578 
4579         /*
4580          * The intel 510 drive has buggy DRAT/RZAT. Explicitly exclude
4581          * that model before whitelisting all other intel SSDs.
4582          */
4583         { "INTEL*SSDSC2MH*",            NULL,   0, },
4584 
4585         { "Micron*",                    NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4586         { "Crucial*",                   NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4587         { "INTEL*SSD*",                 NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4588         { "SSD*INTEL*",                 NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4589         { "Samsung*SSD*",               NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4590         { "SAMSUNG*SSD*",               NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4591         { "SAMSUNG*MZ7KM*",             NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4592         { "ST[1248][0248]0[FH]*",       NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
4593 
4594         /*
4595          * Some WD SATA-I drives spin up and down erratically when the link
4596          * is put into the slumber mode.  We don't have full list of the
4597          * affected devices.  Disable LPM if the device matches one of the
4598          * known prefixes and is SATA-1.  As a side effect LPM partial is
4599          * lost too.
4600          *
4601          * https://bugzilla.kernel.org/show_bug.cgi?id=57211
4602          */
4603         { "WDC WD800JD-*",              NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4604         { "WDC WD1200JD-*",             NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4605         { "WDC WD1600JD-*",             NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4606         { "WDC WD2000JD-*",             NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4607         { "WDC WD2500JD-*",             NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4608         { "WDC WD3000JD-*",             NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4609         { "WDC WD3200JD-*",             NULL,   ATA_HORKAGE_WD_BROKEN_LPM },
4610 
4611         /* End Marker */
4612         { }
4613 };
4614 
4615 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4616 {
4617         unsigned char model_num[ATA_ID_PROD_LEN + 1];
4618         unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4619         const struct ata_blacklist_entry *ad = ata_device_blacklist;
4620 
4621         ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4622         ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4623 
4624         while (ad->model_num) {
4625                 if (glob_match(ad->model_num, model_num)) {
4626                         if (ad->model_rev == NULL)
4627                                 return ad->horkage;
4628                         if (glob_match(ad->model_rev, model_rev))
4629                                 return ad->horkage;
4630                 }
4631                 ad++;
4632         }
4633         return 0;
4634 }
4635 
4636 static int ata_dma_blacklisted(const struct ata_device *dev)
4637 {
4638         /* We don't support polling DMA.
4639          * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4640          * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4641          */
4642         if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4643             (dev->flags & ATA_DFLAG_CDB_INTR))
4644                 return 1;
4645         return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4646 }
4647 
4648 /**
4649  *      ata_is_40wire           -       check drive side detection
4650  *      @dev: device
4651  *
4652  *      Perform drive side detection decoding, allowing for device vendors
4653  *      who can't follow the documentation.
4654  */
4655 
4656 static int ata_is_40wire(struct ata_device *dev)
4657 {
4658         if (dev->horkage & ATA_HORKAGE_IVB)
4659                 return ata_drive_40wire_relaxed(dev->id);
4660         return ata_drive_40wire(dev->id);
4661 }
4662 
4663 /**
4664  *      cable_is_40wire         -       40/80/SATA decider
4665  *      @ap: port to consider
4666  *
4667  *      This function encapsulates the policy for speed management
4668  *      in one place. At the moment we don't cache the result but
4669  *      there is a good case for setting ap->cbl to the result when
4670  *      we are called with unknown cables (and figuring out if it
4671  *      impacts hotplug at all).
4672  *
4673  *      Return 1 if the cable appears to be 40 wire.
4674  */
4675 
4676 static int cable_is_40wire(struct ata_port *ap)
4677 {
4678         struct ata_link *link;
4679         struct ata_device *dev;
4680 
4681         /* If the controller thinks we are 40 wire, we are. */
4682         if (ap->cbl == ATA_CBL_PATA40)
4683                 return 1;
4684 
4685         /* If the controller thinks we are 80 wire, we are. */
4686         if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4687                 return 0;
4688 
4689         /* If the system is known to be 40 wire short cable (eg
4690          * laptop), then we allow 80 wire modes even if the drive
4691          * isn't sure.
4692          */
4693         if (ap->cbl == ATA_CBL_PATA40_SHORT)
4694                 return 0;
4695 
4696         /* If the controller doesn't know, we scan.
4697          *
4698          * Note: We look for all 40 wire detects at this point.  Any
4699          *       80 wire detect is taken to be 80 wire cable because
4700          * - in many setups only the one drive (slave if present) will
4701          *   give a valid detect
4702          * - if you have a non detect capable drive you don't want it
4703          *   to colour the choice
4704          */
4705         ata_for_each_link(link, ap, EDGE) {
4706                 ata_for_each_dev(dev, link, ENABLED) {
4707                         if (!ata_is_40wire(dev))
4708                                 return 0;
4709                 }
4710         }
4711         return 1;
4712 }
4713 
4714 /**
4715  *      ata_dev_xfermask - Compute supported xfermask of the given device
4716  *      @dev: Device to compute xfermask for
4717  *
4718  *      Compute supported xfermask of @dev and store it in
4719  *      dev->*_mask.  This function is responsible for applying all
4720  *      known limits including host controller limits, device
4721  *      blacklist, etc...
4722  *
4723  *      LOCKING:
4724  *      None.
4725  */
4726 static void ata_dev_xfermask(struct ata_device *dev)
4727 {
4728         struct ata_link *link = dev->link;
4729         struct ata_port *ap = link->ap;
4730         struct ata_host *host = ap->host;
4731         unsigned long xfer_mask;
4732 
4733         /* controller modes available */
4734         xfer_mask = ata_pack_xfermask(ap->pio_mask,
4735                                       ap->mwdma_mask, ap->udma_mask);
4736 
4737         /* drive modes available */
4738         xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4739                                        dev->mwdma_mask, dev->udma_mask);
4740         xfer_mask &= ata_id_xfermask(dev->id);
4741 
4742         /*
4743          *      CFA Advanced TrueIDE timings are not allowed on a shared
4744          *      cable
4745          */
4746         if (ata_dev_pair(dev)) {
4747                 /* No PIO5 or PIO6 */
4748                 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4749                 /* No MWDMA3 or MWDMA 4 */
4750                 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4751         }
4752 
4753         if (ata_dma_blacklisted(dev)) {
4754                 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4755                 ata_dev_warn(dev,
4756                              "device is on DMA blacklist, disabling DMA\n");
4757         }
4758 
4759         if ((host->flags & ATA_HOST_SIMPLEX) &&
4760             host->simplex_claimed && host->simplex_claimed != ap) {
4761                 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4762                 ata_dev_warn(dev,
4763                              "simplex DMA is claimed by other device, disabling DMA\n");
4764         }
4765 
4766         if (ap->flags & ATA_FLAG_NO_IORDY)
4767                 xfer_mask &= ata_pio_mask_no_iordy(dev);
4768 
4769         if (ap->ops->mode_filter)
4770                 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4771 
4772         /* Apply cable rule here.  Don't apply it early because when
4773          * we handle hot plug the cable type can itself change.
4774          * Check this last so that we know if the transfer rate was
4775          * solely limited by the cable.
4776          * Unknown or 80 wire cables reported host side are checked
4777          * drive side as well. Cases where we know a 40wire cable
4778          * is used safely for 80 are not checked here.
4779          */
4780         if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4781                 /* UDMA/44 or higher would be available */
4782                 if (cable_is_40wire(ap)) {
4783                         ata_dev_warn(dev,
4784                                      "limited to UDMA/33 due to 40-wire cable\n");
4785                         xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4786                 }
4787 
4788         ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4789                             &dev->mwdma_mask, &dev->udma_mask);
4790 }
4791 
4792 /**
4793  *      ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4794  *      @dev: Device to which command will be sent
4795  *
4796  *      Issue SET FEATURES - XFER MODE command to device @dev
4797  *      on port @ap.
4798  *
4799  *      LOCKING:
4800  *      PCI/etc. bus probe sem.
4801  *
4802  *      RETURNS:
4803  *      0 on success, AC_ERR_* mask otherwise.
4804  */
4805 
4806 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4807 {
4808         struct ata_taskfile tf;
4809         unsigned int err_mask;
4810 
4811         /* set up set-features taskfile */
4812         DPRINTK("set features - xfer mode\n");
4813 
4814         /* Some controllers and ATAPI devices show flaky interrupt
4815          * behavior after setting xfer mode.  Use polling instead.
4816          */
4817         ata_tf_init(dev, &tf);
4818         tf.command = ATA_CMD_SET_FEATURES;
4819         tf.feature = SETFEATURES_XFER;
4820         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4821         tf.protocol = ATA_PROT_NODATA;
4822         /* If we are using IORDY we must send the mode setting command */
4823         if (ata_pio_need_iordy(dev))
4824                 tf.nsect = dev->xfer_mode;
4825         /* If the device has IORDY and the controller does not - turn it off */
4826         else if (ata_id_has_iordy(dev->id))
4827                 tf.nsect = 0x01;
4828         else /* In the ancient relic department - skip all of this */
4829                 return 0;
4830 
4831         /* On some disks, this command causes spin-up, so we need longer timeout */
4832         err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 15000);
4833 
4834         DPRINTK("EXIT, err_mask=%x\n", err_mask);
4835         return err_mask;
4836 }
4837 
4838 /**
4839  *      ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4840  *      @dev: Device to which command will be sent
4841  *      @enable: Whether to enable or disable the feature
4842  *      @feature: The sector count represents the feature to set
4843  *
4844  *      Issue SET FEATURES - SATA FEATURES command to device @dev
4845  *      on port @ap with sector count
4846  *
4847  *      LOCKING:
4848  *      PCI/etc. bus probe sem.
4849  *
4850  *      RETURNS:
4851  *      0 on success, AC_ERR_* mask otherwise.
4852  */
4853 unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4854 {
4855         struct ata_taskfile tf;
4856         unsigned int err_mask;
4857         unsigned long timeout = 0;
4858 
4859         /* set up set-features taskfile */
4860         DPRINTK("set features - SATA features\n");
4861 
4862         ata_tf_init(dev, &tf);
4863         tf.command = ATA_CMD_SET_FEATURES;
4864         tf.feature = enable;
4865         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4866         tf.protocol = ATA_PROT_NODATA;
4867         tf.nsect = feature;
4868 
4869         if (enable == SETFEATURES_SPINUP)
4870                 timeout = ata_probe_timeout ?
4871                           ata_probe_timeout * 1000 : SETFEATURES_SPINUP_TIMEOUT;
4872         err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, timeout);
4873 
4874         DPRINTK("EXIT, err_mask=%x\n", err_mask);
4875         return err_mask;
4876 }
4877 EXPORT_SYMBOL_GPL(ata_dev_set_feature);
4878 
4879 /**
4880  *      ata_dev_init_params - Issue INIT DEV PARAMS command
4881  *      @dev: Device to which command will be sent
4882  *      @heads: Number of heads (taskfile parameter)
4883  *      @sectors: Number of sectors (taskfile parameter)
4884  *
4885  *      LOCKING:
4886  *      Kernel thread context (may sleep)
4887  *
4888  *      RETURNS:
4889  *      0 on success, AC_ERR_* mask otherwise.
4890  */
4891 static unsigned int ata_dev_init_params(struct ata_device *dev,
4892                                         u16 heads, u16 sectors)
4893 {
4894         struct ata_taskfile tf;
4895         unsigned int err_mask;
4896 
4897         /* Number of sectors per track 1-255. Number of heads 1-16 */
4898         if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4899                 return AC_ERR_INVALID;
4900 
4901         /* set up init dev params taskfile */
4902         DPRINTK("init dev params \n");
4903 
4904         ata_tf_init(dev, &tf);
4905         tf.command = ATA_CMD_INIT_DEV_PARAMS;
4906         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4907         tf.protocol = ATA_PROT_NODATA;
4908         tf.nsect = sectors;
4909         tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4910 
4911         err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4912         /* A clean abort indicates an original or just out of spec drive
4913            and we should continue as we issue the setup based on the
4914            drive reported working geometry */
4915         if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4916                 err_mask = 0;
4917 
4918         DPRINTK("EXIT, err_mask=%x\n", err_mask);
4919         return err_mask;
4920 }
4921 
4922 /**
4923  *      atapi_check_dma - Check whether ATAPI DMA can be supported
4924  *      @qc: Metadata associated with taskfile to check
4925  *
4926  *      Allow low-level driver to filter ATA PACKET commands, returning
4927  *      a status indicating whether or not it is OK to use DMA for the
4928  *      supplied PACKET command.
4929  *
4930  *      LOCKING:
4931  *      spin_lock_irqsave(host lock)
4932  *
4933  *      RETURNS: 0 when ATAPI DMA can be used
4934  *               nonzero otherwise
4935  */
4936 int atapi_check_dma(struct ata_queued_cmd *qc)
4937 {
4938         struct ata_port *ap = qc->ap;
4939 
4940         /* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
4941          * few ATAPI devices choke on such DMA requests.
4942          */
4943         if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
4944             unlikely(qc->nbytes & 15))
4945                 return 1;
4946 
4947         if (ap->ops->check_atapi_dma)
4948                 return ap->ops->check_atapi_dma(qc);
4949 
4950         return 0;
4951 }
4952 
4953 /**
4954  *      ata_std_qc_defer - Check whether a qc needs to be deferred
4955  *      @qc: ATA command in question
4956  *
4957  *      Non-NCQ commands cannot run with any other command, NCQ or
4958  *      not.  As upper layer only knows the queue depth, we are
4959  *      responsible for maintaining exclusion.  This function checks
4960  *      whether a new command @qc can be issued.
4961  *
4962  *      LOCKING:
4963  *      spin_lock_irqsave(host lock)
4964  *
4965  *      RETURNS:
4966  *      ATA_DEFER_* if deferring is needed, 0 otherwise.
4967  */
4968 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4969 {
4970         struct ata_link *link = qc->dev->link;
4971 
4972         if (ata_is_ncq(qc->tf.protocol)) {
4973                 if (!ata_tag_valid(link->active_tag))
4974                         return 0;
4975         } else {
4976                 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4977                         return 0;
4978         }
4979 
4980         return ATA_DEFER_LINK;
4981 }
4982 
4983 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4984 
4985 /**
4986  *      ata_sg_init - Associate command with scatter-gather table.
4987  *      @qc: Command to be associated
4988  *      @sg: Scatter-gather table.
4989  *      @n_elem: Number of elements in s/g table.
4990  *
4991  *      Initialize the data-related elements of queued_cmd @qc
4992  *      to point to a scatter-gather table @sg, containing @n_elem
4993  *      elements.
4994  *
4995  *      LOCKING:
4996  *      spin_lock_irqsave(host lock)
4997  */
4998 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4999                  unsigned int n_elem)
5000 {
5001         qc->sg = sg;
5002         qc->n_elem = n_elem;
5003         qc->cursg = qc->sg;
5004 }
5005 
5006 #ifdef CONFIG_HAS_DMA
5007 
5008 /**
5009  *      ata_sg_clean - Unmap DMA memory associated with command
5010  *      @qc: Command containing DMA memory to be released
5011  *
5012  *      Unmap all mapped DMA memory associated with this command.
5013  *
5014  *      LOCKING:
5015  *      spin_lock_irqsave(host lock)
5016  */
5017 static void ata_sg_clean(struct ata_queued_cmd *qc)
5018 {
5019         struct ata_port *ap = qc->ap;
5020         struct scatterlist *sg = qc->sg;
5021         int dir = qc->dma_dir;
5022 
5023         WARN_ON_ONCE(sg == NULL);
5024 
5025         VPRINTK("unmapping %u sg elements\n", qc->n_elem);
5026 
5027         if (qc->n_elem)
5028                 dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
5029 
5030         qc->flags &= ~ATA_QCFLAG_DMAMAP;
5031         qc->sg = NULL;
5032 }
5033 
5034 /**
5035  *      ata_sg_setup - DMA-map the scatter-gather table associated with a command.
5036  *      @qc: Command with scatter-gather table to be mapped.
5037  *
5038  *      DMA-map the scatter-gather table associated with queued_cmd @qc.
5039  *
5040  *      LOCKING:
5041  *      spin_lock_irqsave(host lock)
5042  *
5043  *      RETURNS:
5044  *      Zero on success, negative on error.
5045  *
5046  */
5047 static int ata_sg_setup(struct ata_queued_cmd *qc)
5048 {
5049         struct ata_port *ap = qc->ap;
5050         unsigned int n_elem;
5051 
5052         VPRINTK("ENTER, ata%u\n", ap->print_id);
5053 
5054         n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
5055         if (n_elem < 1)
5056                 return -1;
5057 
5058         VPRINTK("%d sg elements mapped\n", n_elem);
5059         qc->orig_n_elem = qc->n_elem;
5060         qc->n_elem = n_elem;
5061         qc->flags |= ATA_QCFLAG_DMAMAP;
5062 
5063         return 0;
5064 }
5065 
5066 #else /* !CONFIG_HAS_DMA */
5067 
5068 static inline void ata_sg_clean(struct ata_queued_cmd *qc) {}
5069 static inline int ata_sg_setup(struct ata_queued_cmd *qc) { return -1; }
5070 
5071 #endif /* !CONFIG_HAS_DMA */
5072 
5073 /**
5074  *      swap_buf_le16 - swap halves of 16-bit words in place
5075  *      @buf:  Buffer to swap
5076  *      @buf_words:  Number of 16-bit words in buffer.
5077  *
5078  *      Swap halves of 16-bit words if needed to convert from
5079  *      little-endian byte order to native cpu byte order, or
5080  *      vice-versa.
5081  *
5082  *      LOCKING:
5083  *      Inherited from caller.
5084  */
5085 void swap_buf_le16(u16 *buf, unsigned int buf_words)
5086 {
5087 #ifdef __BIG_ENDIAN
5088         unsigned int i;
5089 
5090         for (i = 0; i < buf_words; i++)
5091                 buf[i] = le16_to_cpu(buf[i]);
5092 #endif /* __BIG_ENDIAN */
5093 }
5094 
5095 /**
5096  *      ata_qc_new_init - Request an available ATA command, and initialize it
5097  *      @dev: Device from whom we request an available command structure
5098  *      @tag: tag
5099  *
5100  *      LOCKING:
5101  *      None.
5102  */
5103 
5104 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag)
5105 {
5106         struct ata_port *ap = dev->link->ap;
5107         struct ata_queued_cmd *qc;
5108 
5109         /* no command while frozen */
5110         if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5111                 return NULL;
5112 
5113         /* libsas case */
5114         if (ap->flags & ATA_FLAG_SAS_HOST) {
5115                 tag = ata_sas_allocate_tag(ap);
5116                 if (tag < 0)
5117                         return NULL;
5118         }
5119 
5120         qc = __ata_qc_from_tag(ap, tag);
5121         qc->tag = qc->hw_tag = tag;
5122         qc->scsicmd = NULL;
5123         qc->ap = ap;
5124         qc->dev = dev;
5125 
5126         ata_qc_reinit(qc);
5127 
5128         return qc;
5129 }
5130 
5131 /**
5132  *      ata_qc_free - free unused ata_queued_cmd
5133  *      @qc: Command to complete
5134  *
5135  *      Designed to free unused ata_queued_cmd object
5136  *      in case something prevents using it.
5137  *
5138  *      LOCKING:
5139  *      spin_lock_irqsave(host lock)
5140  */
5141 void ata_qc_free(struct ata_queued_cmd *qc)
5142 {
5143         struct ata_port *ap;
5144         unsigned int tag;
5145 
5146         WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5147         ap = qc->ap;
5148 
5149         qc->flags = 0;
5150         tag = qc->tag;
5151         if (ata_tag_valid(tag)) {
5152                 qc->tag = ATA_TAG_POISON;
5153                 if (ap->flags & ATA_FLAG_SAS_HOST)
5154                         ata_sas_free_tag(tag, ap);
5155         }
5156 }
5157 
5158 void __ata_qc_complete(struct ata_queued_cmd *qc)
5159 {
5160         struct ata_port *ap;
5161         struct ata_link *link;
5162 
5163         WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5164         WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
5165         ap = qc->ap;
5166         link = qc->dev->link;
5167 
5168         if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5169                 ata_sg_clean(qc);
5170 
5171         /* command should be marked inactive atomically with qc completion */
5172         if (ata_is_ncq(qc->tf.protocol)) {
5173                 link->sactive &= ~(1 << qc->hw_tag);
5174                 if (!link->sactive)
5175                         ap->nr_active_links--;
5176         } else {
5177                 link->active_tag = ATA_TAG_POISON;
5178                 ap->nr_active_links--;
5179         }
5180 
5181         /* clear exclusive status */
5182         if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
5183                      ap->excl_link == link))
5184                 ap->excl_link = NULL;
5185 
5186         /* atapi: mark qc as inactive to prevent the interrupt handler
5187          * from completing the command twice later, before the error handler
5188          * is called. (when rc != 0 and atapi request sense is needed)
5189          */
5190         qc->flags &= ~ATA_QCFLAG_ACTIVE;
5191         ap->qc_active &= ~(1ULL << qc->tag);
5192 
5193         /* call completion callback */
5194         qc->complete_fn(qc);
5195 }
5196 
5197 static void fill_result_tf(struct ata_queued_cmd *qc)
5198 {
5199         struct ata_port *ap = qc->ap;
5200 
5201         qc->result_tf.flags = qc->tf.flags;
5202         ap->ops->qc_fill_rtf(qc);
5203 }
5204 
5205 static void ata_verify_xfer(struct ata_queued_cmd *qc)
5206 {
5207         struct ata_device *dev = qc->dev;
5208 
5209         if (!ata_is_data(qc->tf.protocol))
5210                 return;
5211 
5212         if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
5213                 return;
5214 
5215         dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
5216 }
5217 
5218 /**
5219  *      ata_qc_complete - Complete an active ATA command
5220  *      @qc: Command to complete
5221  *
5222  *      Indicate to the mid and upper layers that an ATA command has
5223  *      completed, with either an ok or not-ok status.
5224  *
5225  *      Refrain from calling this function multiple times when
5226  *      successfully completing multiple NCQ commands.
5227  *      ata_qc_complete_multiple() should be used instead, which will
5228  *      properly update IRQ expect state.
5229  *
5230  *      LOCKING:
5231  *      spin_lock_irqsave(host lock)
5232  */
5233 void ata_qc_complete(struct ata_queued_cmd *qc)
5234 {
5235         struct ata_port *ap = qc->ap;
5236 
5237         /* Trigger the LED (if available) */
5238         ledtrig_disk_activity(!!(qc->tf.flags & ATA_TFLAG_WRITE));
5239 
5240         /* XXX: New EH and old EH use different mechanisms to
5241          * synchronize EH with regular execution path.
5242          *
5243          * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5244          * Normal execution path is responsible for not accessing a
5245          * failed qc.  libata core enforces the rule by returning NULL
5246          * from ata_qc_from_tag() for failed qcs.
5247          *
5248          * Old EH depends on ata_qc_complete() nullifying completion
5249          * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
5250          * not synchronize with interrupt handler.  Only PIO task is
5251          * taken care of.
5252          */
5253         if (ap->ops->error_handler) {
5254                 struct ata_device *dev = qc->dev;
5255                 struct ata_eh_info *ehi = &dev->link->eh_info;
5256 
5257                 if (unlikely(qc->err_mask))
5258                         qc->flags |= ATA_QCFLAG_FAILED;
5259 
5260                 /*
5261                  * Finish internal commands without any further processing
5262                  * and always with the result TF filled.
5263                  */
5264                 if (unlikely(ata_tag_internal(qc->tag))) {
5265                         fill_result_tf(qc);
5266                         trace_ata_qc_complete_internal(qc);
5267                         __ata_qc_complete(qc);
5268                         return;
5269                 }
5270 
5271                 /*
5272                  * Non-internal qc has failed.  Fill the result TF and
5273                  * summon EH.
5274                  */
5275                 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5276                         fill_result_tf(qc);
5277                         trace_ata_qc_complete_failed(qc);
5278                         ata_qc_schedule_eh(qc);
5279                         return;
5280                 }
5281 
5282                 WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
5283 
5284                 /* read result TF if requested */
5285                 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5286                         fill_result_tf(qc);
5287 
5288                 trace_ata_qc_complete_done(qc);
5289                 /* Some commands need post-processing after successful
5290                  * completion.
5291                  */
5292                 switch (qc->tf.command) {
5293                 case ATA_CMD_SET_FEATURES:
5294                         if (qc->tf.feature != SETFEATURES_WC_ON &&
5295                             qc->tf.feature != SETFEATURES_WC_OFF &&
5296                             qc->tf.feature != SETFEATURES_RA_ON &&
5297                             qc->tf.feature != SETFEATURES_RA_OFF)
5298                                 break;
5299                         /* fall through */
5300                 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5301                 case ATA_CMD_SET_MULTI: /* multi_count changed */
5302                         /* revalidate device */
5303                         ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5304                         ata_port_schedule_eh(ap);
5305                         break;
5306 
5307                 case ATA_CMD_SLEEP:
5308                         dev->flags |= ATA_DFLAG_SLEEPING;
5309                         break;
5310                 }
5311 
5312                 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
5313                         ata_verify_xfer(qc);
5314 
5315                 __ata_qc_complete(qc);
5316         } else {
5317                 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5318                         return;
5319 
5320                 /* read result TF if failed or requested */
5321                 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5322                         fill_result_tf(qc);
5323 
5324                 __ata_qc_complete(qc);
5325         }
5326 }
5327 
5328 /**
5329  *      ata_qc_get_active - get bitmask of active qcs
5330  *      @ap: port in question
5331  *
5332  *      LOCKING:
5333  *      spin_lock_irqsave(host lock)
5334  *
5335  *      RETURNS:
5336  *      Bitmask of active qcs
5337  */
5338 u64 ata_qc_get_active(struct ata_port *ap)
5339 {
5340         u64 qc_active = ap->qc_active;
5341 
5342         /* ATA_TAG_INTERNAL is sent to hw as tag 0 */
5343         if (qc_active & (1ULL << ATA_TAG_INTERNAL)) {
5344                 qc_active |= (1 << 0);
5345                 qc_active &= ~(1ULL << ATA_TAG_INTERNAL);
5346         }
5347 
5348         return qc_active;
5349 }
5350 EXPORT_SYMBOL_GPL(ata_qc_get_active);
5351 
5352 /**
5353  *      ata_qc_complete_multiple - Complete multiple qcs successfully
5354  *      @ap: port in question
5355  *      @qc_active: new qc_active mask
5356  *
5357  *      Complete in-flight commands.  This functions is meant to be
5358  *      called from low-level driver's interrupt routine to complete
5359  *      requests normally.  ap->qc_active and @qc_active is compared
5360  *      and commands are completed accordingly.
5361  *
5362  *      Always use this function when completing multiple NCQ commands
5363  *      from IRQ handlers instead of calling ata_qc_complete()
5364  *      multiple times to keep IRQ expect status properly in sync.
5365  *
5366  *      LOCKING:
5367  *      spin_lock_irqsave(host lock)
5368  *
5369  *      RETURNS:
5370  *      Number of completed commands on success, -errno otherwise.
5371  */
5372 int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
5373 {
5374         u64 done_mask, ap_qc_active = ap->qc_active;
5375         int nr_done = 0;
5376 
5377         /*
5378          * If the internal tag is set on ap->qc_active, then we care about
5379          * bit0 on the passed in qc_active mask. Move that bit up to match
5380          * the internal tag.
5381          */
5382         if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
5383                 qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
5384                 qc_active ^= qc_active & 0x01;
5385         }
5386 
5387         done_mask = ap_qc_active ^ qc_active;
5388 
5389         if (unlikely(done_mask & qc_active)) {
5390                 ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
5391                              ap->qc_active, qc_active);
5392                 return -EINVAL;
5393         }
5394 
5395         while (done_mask) {
5396                 struct ata_queued_cmd *qc;
5397                 unsigned int tag = __ffs64(done_mask);
5398 
5399                 qc = ata_qc_from_tag(ap, tag);
5400                 if (qc) {
5401                         ata_qc_complete(qc);
5402                         nr_done++;
5403                 }
5404                 done_mask &= ~(1ULL << tag);
5405         }
5406 
5407         return nr_done;
5408 }
5409 
5410 /**
5411  *      ata_qc_issue - issue taskfile to device
5412  *      @qc: command to issue to device
5413  *
5414  *      Prepare an ATA command to submission to device.
5415  *      This includes mapping the data into a DMA-able
5416  *      area, filling in the S/G table, and finally
5417  *      writing the taskfile to hardware, starting the command.
5418  *
5419  *      LOCKING:
5420  *      spin_lock_irqsave(host lock)
5421  */
5422 void ata_qc_issue(struct ata_queued_cmd *qc)
5423 {
5424         struct ata_port *ap = qc->ap;
5425         struct ata_link *link = qc->dev->link;
5426         u8 prot = qc->tf.protocol;
5427 
5428         /* Make sure only one non-NCQ command is outstanding.  The
5429          * check is skipped for old EH because it reuses active qc to
5430          * request ATAPI sense.
5431          */
5432         WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5433 
5434         if (ata_is_ncq(prot)) {
5435                 WARN_ON_ONCE(link->sactive & (1 << qc->hw_tag));
5436 
5437                 if (!link->sactive)
5438                         ap->nr_active_links++;
5439                 link->sactive |= 1 << qc->hw_tag;
5440         } else {
5441                 WARN_ON_ONCE(link->sactive);
5442 
5443                 ap->nr_active_links++;
5444                 link->active_tag = qc->tag;
5445         }
5446 
5447         qc->flags |= ATA_QCFLAG_ACTIVE;
5448         ap->qc_active |= 1ULL << qc->tag;
5449 
5450         /*
5451          * We guarantee to LLDs that they will have at least one
5452          * non-zero sg if the command is a data command.
5453          */
5454         if (ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes))
5455                 goto sys_err;
5456 
5457         if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5458                                  (ap->flags & ATA_FLAG_PIO_DMA)))
5459                 if (ata_sg_setup(qc))
5460                         goto sys_err;
5461 
5462         /* if device is sleeping, schedule reset and abort the link */
5463         if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5464                 link->eh_info.action |= ATA_EH_RESET;
5465                 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5466                 ata_link_abort(link);
5467                 return;
5468         }
5469 
5470         ap->ops->qc_prep(qc);
5471         trace_ata_qc_issue(qc);
5472         qc->err_mask |= ap->ops->qc_issue(qc);
5473         if (unlikely(qc->err_mask))
5474                 goto err;
5475         return;
5476 
5477 sys_err:
5478         qc->err_mask |= AC_ERR_SYSTEM;
5479 err:
5480         ata_qc_complete(qc);
5481 }
5482 
5483 /**
5484  *      sata_scr_valid - test whether SCRs are accessible
5485  *      @link: ATA link to test SCR accessibility for
5486  *
5487  *      Test whether SCRs are accessible for @link.
5488  *
5489  *      LOCKING:
5490  *      None.
5491  *
5492  *      RETURNS:
5493  *      1 if SCRs are accessible, 0 otherwise.
5494  */
5495 int sata_scr_valid(struct ata_link *link)
5496 {
5497         struct ata_port *ap = link->ap;
5498 
5499         return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5500 }
5501 
5502 /**
5503  *      sata_scr_read - read SCR register of the specified port
5504  *      @link: ATA link to read SCR for
5505  *      @reg: SCR to read
5506  *      @val: Place to store read value
5507  *
5508  *      Read SCR register @reg of @link into *@val.  This function is
5509  *      guaranteed to succeed if @link is ap->link, the cable type of
5510  *      the port is SATA and the port implements ->scr_read.
5511  *
5512  *      LOCKING:
5513  *      None if @link is ap->link.  Kernel thread context otherwise.
5514  *
5515  *      RETURNS:
5516  *      0 on success, negative errno on failure.
5517  */
5518 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5519 {
5520         if (ata_is_host_link(link)) {
5521                 if (sata_scr_valid(link))
5522                         return link->ap->ops->scr_read(link, reg, val);
5523                 return -EOPNOTSUPP;
5524         }
5525 
5526         return sata_pmp_scr_read(link, reg, val);
5527 }
5528 
5529 /**
5530  *      sata_scr_write - write SCR register of the specified port
5531  *      @link: ATA link to write SCR for
5532  *      @reg: SCR to write
5533  *      @val: value to write
5534  *
5535  *      Write @val to SCR register @reg of @link.  This function is
5536  *      guaranteed to succeed if @link is ap->link, the cable type of
5537  *      the port is SATA and the port implements ->scr_read.
5538  *
5539  *      LOCKING:
5540  *      None if @link is ap->link.  Kernel thread context otherwise.
5541  *
5542  *      RETURNS:
5543  *      0 on success, negative errno on failure.
5544  */
5545 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5546 {
5547         if (ata_is_host_link(link)) {
5548                 if (sata_scr_valid(link))
5549                         return link->ap->ops->scr_write(link, reg, val);
5550                 return -EOPNOTSUPP;
5551         }
5552 
5553         return sata_pmp_scr_write(link, reg, val);
5554 }
5555 
5556 /**
5557  *      sata_scr_write_flush - write SCR register of the specified port and flush
5558  *      @link: ATA link to write SCR for
5559  *      @reg: SCR to write
5560  *      @val: value to write
5561  *
5562  *      This function is identical to sata_scr_write() except that this
5563  *      function performs flush after writing to the register.
5564  *
5565  *      LOCKING:
5566  *      None if @link is ap->link.  Kernel thread context otherwise.
5567  *
5568  *      RETURNS:
5569  *      0 on success, negative errno on failure.
5570  */
5571 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5572 {
5573         if (ata_is_host_link(link)) {
5574                 int rc;
5575 
5576                 if (sata_scr_valid(link)) {
5577                         rc = link->ap->ops->scr_write(link, reg, val);
5578                         if (rc == 0)
5579                                 rc = link->ap->ops->scr_read(link, reg, &val);
5580                         return rc;
5581                 }
5582                 return -EOPNOTSUPP;
5583         }
5584 
5585         return sata_pmp_scr_write(link, reg, val);
5586 }
5587 
5588 /**
5589  *      ata_phys_link_online - test whether the given link is online
5590  *      @link: ATA link to test
5591  *
5592  *      Test whether @link is online.  Note that this function returns
5593  *      0 if online status of @link cannot be obtained, so
5594  *      ata_link_online(link) != !ata_link_offline(link).
5595  *
5596  *      LOCKING:
5597  *      None.
5598  *
5599  *      RETURNS:
5600  *      True if the port online status is available and online.
5601  */
5602 bool ata_phys_link_online(struct ata_link *link)
5603 {
5604         u32 sstatus;
5605 
5606         if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5607             ata_sstatus_online(sstatus))
5608                 return true;
5609         return false;
5610 }
5611 
5612 /**
5613  *      ata_phys_link_offline - test whether the given link is offline
5614  *      @link: ATA link to test
5615  *
5616  *      Test whether @link is offline.  Note that this function
5617  *      returns 0 if offline status of @link cannot be obtained, so
5618  *      ata_link_online(link) != !ata_link_offline(link).
5619  *
5620  *      LOCKING:
5621  *      None.
5622  *
5623  *      RETURNS:
5624  *      True if the port offline status is available and offline.
5625  */
5626 bool ata_phys_link_offline(struct ata_link *link)
5627 {
5628         u32 sstatus;
5629 
5630         if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5631             !ata_sstatus_online(sstatus))
5632                 return true;
5633         return false;
5634 }
5635 
5636 /**
5637  *      ata_link_online - test whether the given link is online
5638  *      @link: ATA link to test
5639  *
5640  *      Test whether @link is online.  This is identical to
5641  *      ata_phys_link_online() when there's no slave link.  When
5642  *      there's a slave link, this function should only be called on
5643  *      the master link and will return true if any of M/S links is
5644  *      online.
5645  *
5646  *      LOCKING:
5647  *      None.
5648  *
5649  *      RETURNS:
5650  *      True if the port online status is available and online.
5651  */
5652 bool ata_link_online(struct ata_link *link)
5653 {
5654         struct ata_link *slave = link->ap->slave_link;
5655 
5656         WARN_ON(link == slave); /* shouldn't be called on slave link */
5657 
5658         return ata_phys_link_online(link) ||
5659                 (slave && ata_phys_link_online(slave));
5660 }
5661 
5662 /**
5663  *      ata_link_offline - test whether the given link is offline
5664  *      @link: ATA link to test
5665  *
5666  *      Test whether @link is offline.  This is identical to
5667  *      ata_phys_link_offline() when there's no slave link.  When
5668  *      there's a slave link, this function should only be called on
5669  *      the master link and will return true if both M/S links are
5670  *      offline.
5671  *
5672  *      LOCKING:
5673  *      None.
5674  *
5675  *      RETURNS:
5676  *      True if the port offline status is available and offline.
5677  */
5678 bool ata_link_offline(struct ata_link *link)
5679 {
5680         struct ata_link *slave = link->ap->slave_link;
5681 
5682         WARN_ON(link == slave); /* shouldn't be called on slave link */
5683 
5684         return ata_phys_link_offline(link) &&
5685                 (!slave || ata_phys_link_offline(slave));
5686 }
5687 
5688 #ifdef CONFIG_PM
5689 static void ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
5690                                 unsigned int action, unsigned int ehi_flags,
5691                                 bool async)
5692 {
5693         struct ata_link *link;
5694         unsigned long flags;
5695 
5696         /* Previous resume operation might still be in
5697          * progress.  Wait for PM_PENDING to clear.
5698          */
5699         if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5700                 ata_port_wait_eh(ap);
5701                 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5702         }
5703 
5704         /* request PM ops to EH */
5705         spin_lock_irqsave(ap->lock, flags);
5706 
5707         ap->pm_mesg = mesg;
5708         ap->pflags |= ATA_PFLAG_PM_PENDING;
5709         ata_for_each_link(link, ap, HOST_FIRST) {
5710                 link->eh_info.action |= action;
5711                 link->eh_info.flags |= ehi_flags;
5712         }
5713 
5714         ata_port_schedule_eh(ap);
5715 
5716         spin_unlock_irqrestore(ap->lock, flags);
5717 
5718         if (!async) {
5719                 ata_port_wait_eh(ap);
5720                 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5721         }
5722 }
5723 
5724 /*
5725  * On some hardware, device fails to respond after spun down for suspend.  As
5726  * the device won't be used before being resumed, we don't need to touch the
5727  * device.  Ask EH to skip the usual stuff and proceed directly to suspend.
5728  *
5729  * http://thread.gmane.org/gmane.linux.ide/46764
5730  */
5731 static const unsigned int ata_port_suspend_ehi = ATA_EHI_QUIET
5732                                                  | ATA_EHI_NO_AUTOPSY
5733                                                  | ATA_EHI_NO_RECOVERY;
5734 
5735 static void ata_port_suspend(struct ata_port *ap, pm_message_t mesg)
5736 {
5737         ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, false);
5738 }
5739 
5740 static void ata_port_suspend_async(struct ata_port *ap, pm_message_t mesg)
5741 {
5742         ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, true);
5743 }
5744 
5745 static int ata_port_pm_suspend(struct device *dev)
5746 {
5747         struct ata_port *ap = to_ata_port(dev);
5748 
5749         if (pm_runtime_suspended(dev))
5750                 return 0;
5751 
5752         ata_port_suspend(ap, PMSG_SUSPEND);
5753         return 0;
5754 }
5755 
5756 static int ata_port_pm_freeze(struct device *dev)
5757 {
5758         struct ata_port *ap = to_ata_port(dev);
5759 
5760         if (pm_runtime_suspended(dev))
5761                 return 0;
5762 
5763         ata_port_suspend(ap, PMSG_FREEZE);
5764         return 0;
5765 }
5766 
5767 static int ata_port_pm_poweroff(struct device *dev)
5768 {
5769         ata_port_suspend(to_ata_port(dev), PMSG_HIBERNATE);
5770         return 0;
5771 }
5772 
5773 static const unsigned int ata_port_resume_ehi = ATA_EHI_NO_AUTOPSY
5774                                                 | ATA_EHI_QUIET;
5775 
5776 static void ata_port_resume(struct ata_port *ap, pm_message_t mesg)
5777 {
5778         ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, false);
5779 }
5780 
5781 static void ata_port_resume_async(struct ata_port *ap, pm_message_t mesg)
5782 {
5783         ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, true);
5784 }
5785 
5786 static int ata_port_pm_resume(struct device *dev)
5787 {
5788         ata_port_resume_async(to_ata_port(dev), PMSG_RESUME);
5789         pm_runtime_disable(dev);
5790         pm_runtime_set_active(dev);
5791         pm_runtime_enable(dev);
5792         return 0;
5793 }
5794 
5795 /*
5796  * For ODDs, the upper layer will poll for media change every few seconds,
5797  * which will make it enter and leave suspend state every few seconds. And
5798  * as each suspend will cause a hard/soft reset, the gain of runtime suspend
5799  * is very little and the ODD may malfunction after constantly being reset.
5800  * So the idle callback here will not proceed to suspend if a non-ZPODD capable
5801  * ODD is attached to the port.
5802  */
5803 static int ata_port_runtime_idle(struct device *dev)
5804 {
5805         struct ata_port *ap = to_ata_port(dev);
5806         struct ata_link *link;
5807         struct ata_device *adev;
5808 
5809         ata_for_each_link(link, ap, HOST_FIRST) {
5810                 ata_for_each_dev(adev, link, ENABLED)
5811                         if (adev->class == ATA_DEV_ATAPI &&
5812                             !zpodd_dev_enabled(adev))
5813                                 return -EBUSY;
5814         }
5815 
5816         return 0;
5817 }
5818 
5819 static int ata_port_runtime_suspend(struct device *dev)
5820 {
5821         ata_port_suspend(to_ata_port(dev), PMSG_AUTO_SUSPEND);
5822         return 0;
5823 }
5824 
5825 static int ata_port_runtime_resume(struct device *dev)
5826 {
5827         ata_port_resume(to_ata_port(dev), PMSG_AUTO_RESUME);
5828         return 0;
5829 }
5830 
5831 static const struct dev_pm_ops ata_port_pm_ops = {
5832         .suspend = ata_port_pm_suspend,
5833         .resume = ata_port_pm_resume,
5834         .freeze = ata_port_pm_freeze,
5835         .thaw = ata_port_pm_resume,
5836         .poweroff = ata_port_pm_poweroff,
5837         .restore = ata_port_pm_resume,
5838 
5839         .runtime_suspend = ata_port_runtime_suspend,
5840         .runtime_resume = ata_port_runtime_resume,
5841         .runtime_idle = ata_port_runtime_idle,
5842 };
5843 
5844 /* sas ports don't participate in pm runtime management of ata_ports,
5845  * and need to resume ata devices at the domain level, not the per-port
5846  * level. sas suspend/resume is async to allow parallel port recovery
5847  * since sas has multiple ata_port instances per Scsi_Host.
5848  */
5849 void ata_sas_port_suspend(struct ata_port *ap)
5850 {
5851         ata_port_suspend_async(ap, PMSG_SUSPEND);
5852 }
5853 EXPORT_SYMBOL_GPL(ata_sas_port_suspend);
5854 
5855 void ata_sas_port_resume(struct ata_port *ap)
5856 {
5857         ata_port_resume_async(ap, PMSG_RESUME);
5858 }
5859 EXPORT_SYMBOL_GPL(ata_sas_port_resume);
5860 
5861 /**
5862  *      ata_host_suspend - suspend host
5863  *      @host: host to suspend
5864  *      @mesg: PM message
5865  *
5866  *      Suspend @host.  Actual operation is performed by port suspend.
5867  */
5868 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5869 {
5870         host->dev->power.power_state = mesg;
5871         return 0;
5872 }
5873 
5874 /**
5875  *      ata_host_resume - resume host
5876  *      @host: host to resume
5877  *
5878  *      Resume @host.  Actual operation is performed by port resume.
5879  */
5880 void ata_host_resume(struct ata_host *host)
5881 {
5882         host->dev->power.power_state = PMSG_ON;
5883 }
5884 #endif
5885 
5886 const struct device_type ata_port_type = {
5887         .name = "ata_port",
5888 #ifdef CONFIG_PM
5889         .pm = &ata_port_pm_ops,
5890 #endif
5891 };
5892 
5893 /**
5894  *      ata_dev_init - Initialize an ata_device structure
5895  *      @dev: Device structure to initialize
5896  *
5897  *      Initialize @dev in preparation for probing.
5898  *
5899  *      LOCKING:
5900  *      Inherited from caller.
5901  */
5902 void ata_dev_init(struct ata_device *dev)
5903 {
5904         struct ata_link *link = ata_dev_phys_link(dev);
5905         struct ata_port *ap = link->ap;
5906         unsigned long flags;
5907 
5908         /* SATA spd limit is bound to the attached device, reset together */
5909         link->sata_spd_limit = link->hw_sata_spd_limit;
5910         link->sata_spd = 0;
5911 
5912         /* High bits of dev->flags are used to record warm plug
5913          * requests which occur asynchronously.  Synchronize using
5914          * host lock.
5915          */
5916         spin_lock_irqsave(ap->lock, flags);
5917         dev->flags &= ~ATA_DFLAG_INIT_MASK;
5918         dev->horkage = 0;
5919         spin_unlock_irqrestore(ap->lock, flags);
5920 
5921         memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
5922                ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5923         dev->pio_mask = UINT_MAX;
5924         dev->mwdma_mask = UINT_MAX;
5925         dev->udma_mask = UINT_MAX;
5926 }
5927 
5928 /**
5929  *      ata_link_init - Initialize an ata_link structure
5930  *      @ap: ATA port link is attached to
5931  *      @link: Link structure to initialize
5932  *      @pmp: Port multiplier port number
5933  *
5934  *      Initialize @link.
5935  *
5936  *      LOCKING:
5937  *      Kernel thread context (may sleep)
5938  */
5939 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5940 {
5941         int i;
5942 
5943         /* clear everything except for devices */
5944         memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
5945                ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5946 
5947         link->ap = ap;
5948         link->pmp = pmp;
5949         link->active_tag = ATA_TAG_POISON;
5950         link->hw_sata_spd_limit = UINT_MAX;
5951 
5952         /* can't use iterator, ap isn't initialized yet */
5953         for (i = 0; i < ATA_MAX_DEVICES; i++) {
5954                 struct ata_device *dev = &link->device[i];
5955 
5956                 dev->link = link;
5957                 dev->devno = dev - link->device;
5958 #ifdef CONFIG_ATA_ACPI
5959                 dev->gtf_filter = ata_acpi_gtf_filter;
5960 #endif
5961                 ata_dev_init(dev);
5962         }
5963 }
5964 
5965 /**
5966  *      sata_link_init_spd - Initialize link->sata_spd_limit
5967  *      @link: Link to configure sata_spd_limit for
5968  *
5969  *      Initialize @link->[hw_]sata_spd_limit to the currently
5970  *      configured value.
5971  *
5972  *      LOCKING:
5973  *      Kernel thread context (may sleep).
5974  *
5975  *      RETURNS:
5976  *      0 on success, -errno on failure.
5977  */
5978 int sata_link_init_spd(struct ata_link *link)
5979 {
5980         u8 spd;
5981         int rc;
5982 
5983         rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5984         if (rc)
5985                 return rc;
5986 
5987         spd = (link->saved_scontrol >> 4) & 0xf;
5988         if (spd)
5989                 link->hw_sata_spd_limit &= (1 << spd) - 1;
5990 
5991         ata_force_link_limits(link);
5992 
5993         link->sata_spd_limit = link->hw_sata_spd_limit;
5994 
5995         return 0;
5996 }
5997 
5998 /**
5999  *      ata_port_alloc - allocate and initialize basic ATA port resources
6000  *      @host: ATA host this allocated port belongs to
6001  *
6002  *      Allocate and initialize basic ATA port resources.
6003  *
6004  *      RETURNS:
6005  *      Allocate ATA port on success, NULL on failure.
6006  *
6007  *      LOCKING:
6008  *      Inherited from calling layer (may sleep).
6009  */
6010 struct ata_port *ata_port_alloc(struct ata_host *host)
6011 {
6012         struct ata_port *ap;
6013 
6014         DPRINTK("ENTER\n");
6015 
6016         ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6017         if (!ap)
6018                 return NULL;
6019 
6020         ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
6021         ap->lock = &host->lock;
6022         ap->print_id = -1;
6023         ap->local_port_no = -1;
6024         ap->host = host;
6025         ap->dev = host->dev;
6026 
6027 #if defined(ATA_VERBOSE_DEBUG)
6028         /* turn on all debugging levels */
6029         ap->msg_enable = 0x00FF;
6030 #elif defined(ATA_DEBUG)
6031         ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6032 #else
6033         ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6034 #endif
6035 
6036         mutex_init(&ap->scsi_scan_mutex);
6037         INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6038         INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6039         INIT_LIST_HEAD(&ap->eh_done_q);
6040         init_waitqueue_head(&ap->eh_wait_q);
6041         init_completion(&ap->park_req_pending);
6042         timer_setup(&ap->fastdrain_timer, ata_eh_fastdrain_timerfn,
6043                     TIMER_DEFERRABLE);
6044 
6045         ap->cbl = ATA_CBL_NONE;
6046 
6047         ata_link_init(ap, &ap->link, 0);
6048 
6049 #ifdef ATA_IRQ_TRAP
6050         ap->stats.unhandled_irq = 1;
6051         ap->stats.idle_irq = 1;
6052 #endif
6053         ata_sff_port_init(ap);
6054 
6055         return ap;
6056 }
6057 
6058 static void ata_devres_release(struct device *gendev, void *res)
6059 {
6060         struct ata_host *host = dev_get_drvdata(gendev);
6061         int i;
6062 
6063         for (i = 0; i < host->n_ports; i++) {
6064                 struct ata_port *ap = host->ports[i];
6065 
6066                 if (!ap)
6067                         continue;
6068 
6069                 if (ap->scsi_host)
6070                         scsi_host_put(ap->scsi_host);
6071 
6072         }
6073 
6074         dev_set_drvdata(gendev, NULL);
6075         ata_host_put(host);
6076 }
6077 
6078 static void ata_host_release(struct kref *kref)
6079 {
6080         struct ata_host *host = container_of(kref, struct ata_host, kref);
6081         int i;
6082 
6083         for (i = 0; i < host->n_ports; i++) {
6084                 struct ata_port *ap = host->ports[i];
6085 
6086                 kfree(ap->pmp_link);
6087                 kfree(ap->slave_link);
6088                 kfree(ap);
6089                 host->ports[i] = NULL;
6090         }
6091         kfree(host);
6092 }
6093 
6094 void ata_host_get(struct ata_host *host)
6095 {
6096         kref_get(&host->kref);
6097 }
6098 
6099 void ata_host_put(struct ata_host *host)
6100 {
6101         kref_put(&host->kref, ata_host_release);
6102 }
6103 
6104 /**
6105  *      ata_host_alloc - allocate and init basic ATA host resources
6106  *      @dev: generic device this host is associated with
6107  *      @max_ports: maximum number of ATA ports associated with this host
6108  *
6109  *      Allocate and initialize basic ATA host resources.  LLD calls
6110  *      this function to allocate a host, initializes it fully and
6111  *      attaches it using ata_host_register().
6112  *
6113  *      @max_ports ports are allocated and host->n_ports is
6114  *      initialized to @max_ports.  The caller is allowed to decrease
6115  *      host->n_ports before calling ata_host_register().  The unused
6116  *      ports will be automatically freed on registration.
6117  *
6118  *      RETURNS:
6119  *      Allocate ATA host on success, NULL on failure.
6120  *
6121  *      LOCKING:
6122  *      Inherited from calling layer (may sleep).
6123  */
6124 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6125 {
6126         struct ata_host *host;
6127         size_t sz;
6128         int i;
6129         void *dr;
6130 
6131         DPRINTK("ENTER\n");
6132 
6133         /* alloc a container for our list of ATA ports (buses) */
6134         sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6135         host = kzalloc(sz, GFP_KERNEL);
6136         if (!host)
6137                 return NULL;
6138 
6139         if (!devres_open_group(dev, NULL, GFP_KERNEL))
6140                 goto err_free;
6141 
6142         dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
6143         if (!dr)
6144                 goto err_out;
6145 
6146         devres_add(dev, dr);
6147         dev_set_drvdata(dev, host);
6148 
6149         spin_lock_init(&host->lock);
6150         mutex_init(&host->eh_mutex);
6151         host->dev = dev;
6152         host->n_ports = max_ports;
6153         kref_init(&host->kref);
6154 
6155         /* allocate ports bound to this host */
6156         for (i = 0; i < max_ports; i++) {
6157                 struct ata_port *ap;
6158 
6159                 ap = ata_port_alloc(host);
6160                 if (!ap)
6161                         goto err_out;
6162 
6163                 ap->port_no = i;
6164                 host->ports[i] = ap;
6165         }
6166 
6167         devres_remove_group(dev, NULL);
6168         return host;
6169 
6170  err_out:
6171         devres_release_group(dev, NULL);
6172  err_free:
6173         kfree(host);
6174         return NULL;
6175 }
6176 
6177 /**
6178  *      ata_host_alloc_pinfo - alloc host and init with port_info array
6179  *      @dev: generic device this host is associated with
6180  *      @ppi: array of ATA port_info to initialize host with
6181  *      @n_ports: number of ATA ports attached to this host
6182  *
6183  *      Allocate ATA host and initialize with info from @ppi.  If NULL
6184  *      terminated, @ppi may contain fewer entries than @n_ports.  The
6185  *      last entry will be used for the remaining ports.
6186  *
6187  *      RETURNS:
6188  *      Allocate ATA host on success, NULL on failure.
6189  *
6190  *      LOCKING:
6191  *      Inherited from calling layer (may sleep).
6192  */
6193 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6194                                       const struct ata_port_info * const * ppi,
6195                                       int n_ports)
6196 {
6197         const struct ata_port_info *pi;
6198         struct ata_host *host;
6199         int i, j;
6200 
6201         host = ata_host_alloc(dev, n_ports);
6202         if (!host)
6203                 return NULL;
6204 
6205         for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6206                 struct ata_port *ap = host->ports[i];
6207 
6208                 if (ppi[j])
6209                         pi = ppi[j++];
6210 
6211                 ap->pio_mask = pi->pio_mask;
6212                 ap->mwdma_mask = pi->mwdma_mask;
6213                 ap->udma_mask = pi->udma_mask;
6214                 ap->flags |= pi->flags;
6215                 ap->link.flags |= pi->link_flags;
6216                 ap->ops = pi->port_ops;
6217 
6218                 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6219                         host->ops = pi->port_ops;
6220         }
6221 
6222         return host;
6223 }
6224 
6225 /**
6226  *      ata_slave_link_init - initialize slave link
6227  *      @ap: port to initialize slave link for
6228  *
6229  *      Create and initialize slave link for @ap.  This enables slave
6230  *      link handling on the port.
6231  *
6232  *      In libata, a port contains links and a link contains devices.
6233  *      There is single host link but if a PMP is attached to it,
6234  *      there can be multiple fan-out links.  On SATA, there's usually
6235  *      a single device connected to a link but PATA and SATA
6236  *      controllers emulating TF based interface can have two - master
6237  *      and slave.
6238  *
6239  *      However, there are a few controllers which don't fit into this
6240  *      abstraction too well - SATA controllers which emulate TF
6241  *      interface with both master and slave devices but also have
6242  *      separate SCR register sets for each device.  These controllers
6243  *      need separate links for physical link handling
6244  *      (e.g. onlineness, link speed) but should be treated like a
6245  *      traditional M/S controller for everything else (e.g. command
6246  *      issue, softreset).
6247  *
6248  *      slave_link is libata's way of handling this class of
6249  *      controllers without impacting core layer too much.  For
6250  *      anything other than physical link handling, the default host
6251  *      link is used for both master and slave.  For physical link
6252  *      handling, separate @ap->slave_link is used.  All dirty details
6253  *      are implemented inside libata core layer.  From LLD's POV, the
6254  *      only difference is that prereset, hardreset and postreset are
6255  *      called once more for the slave link, so the reset sequence
6256  *      looks like the following.
6257  *
6258  *      prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
6259  *      softreset(M) -> postreset(M) -> postreset(S)
6260  *
6261  *      Note that softreset is called only for the master.  Softreset
6262  *      resets both M/S by definition, so SRST on master should handle
6263  *      both (the standard method will work just fine).
6264  *
6265  *      LOCKING:
6266  *      Should be called before host is registered.
6267  *
6268  *      RETURNS:
6269  *      0 on success, -errno on failure.
6270  */
6271 int ata_slave_link_init(struct ata_port *ap)
6272 {
6273         struct ata_link *link;
6274 
6275         WARN_ON(ap->slave_link);
6276         WARN_ON(ap->flags & ATA_FLAG_PMP);
6277 
6278         link = kzalloc(sizeof(*link), GFP_KERNEL);
6279         if (!link)
6280                 return -ENOMEM;
6281 
6282         ata_link_init(ap, link, 1);
6283         ap->slave_link = link;
6284         return 0;
6285 }
6286 
6287 static void ata_host_stop(struct device *gendev, void *res)
6288 {
6289         struct ata_host *host = dev_get_drvdata(gendev);
6290         int i;
6291 
6292         WARN_ON(!(host->flags & ATA_HOST_STARTED));
6293 
6294         for (i = 0; i < host->n_ports; i++) {
6295                 struct ata_port *ap = host->ports[i];
6296 
6297                 if (ap->ops->port_stop)
6298                         ap->ops->port_stop(ap);
6299         }
6300 
6301         if (host->ops->host_stop)
6302                 host->ops->host_stop(host);
6303 }
6304 
6305 /**
6306  *      ata_finalize_port_ops - finalize ata_port_operations
6307  *      @ops: ata_port_operations to finalize
6308  *
6309  *      An ata_port_operations can inherit from another ops and that
6310  *      ops can again inherit from another.  This can go on as many
6311  *      times as necessary as long as there is no loop in the
6312  *      inheritance chain.
6313  *
6314  *      Ops tables are finalized when the host is started.  NULL or
6315  *      unspecified entries are inherited from the closet ancestor
6316  *      which has the method and the entry is populated with it.
6317  *      After finalization, the ops table directly points to all the
6318  *      methods and ->inherits is no longer necessary and cleared.
6319  *
6320  *      Using ATA_OP_NULL, inheriting ops can force a method to NULL.
6321  *
6322  *      LOCKING:
6323  *      None.
6324  */
6325 static void ata_finalize_port_ops(struct ata_port_operations *ops)
6326 {
6327         static DEFINE_SPINLOCK(lock);
6328         const struct ata_port_operations *cur;
6329         void **begin = (void **)ops;
6330         void **end = (void **)&ops->inherits;
6331         void **pp;
6332 
6333         if (!ops || !ops->inherits)
6334                 return;
6335 
6336         spin_lock(&lock);
6337 
6338         for (cur = ops->inherits; cur; cur = cur->inherits) {
6339                 void **inherit = (void **)cur;
6340 
6341                 for (pp = begin; pp < end; pp++, inherit++)
6342                         if (!*pp)
6343                                 *pp = *inherit;
6344         }
6345 
6346         for (pp = begin; pp < end; pp++)
6347                 if (IS_ERR(*pp))
6348                         *pp = NULL;
6349 
6350         ops->inherits = NULL;
6351 
6352         spin_unlock(&lock);
6353 }
6354 
6355 /**
6356  *      ata_host_start - start and freeze ports of an ATA host
6357  *      @host: ATA host to start ports for
6358  *
6359  *      Start and then freeze ports of @host.  Started status is
6360  *      recorded in host->flags, so this function can be called
6361  *      multiple times.  Ports are guaranteed to get started only
6362  *      once.  If host->ops isn't initialized yet, its set to the
6363  *      first non-dummy port ops.
6364  *
6365  *      LOCKING:
6366  *      Inherited from calling layer (may sleep).
6367  *
6368  *      RETURNS:
6369  *      0 if all ports are started successfully, -errno otherwise.
6370  */
6371 int ata_host_start(struct ata_host *host)
6372 {
6373         int have_stop = 0;
6374         void *start_dr = NULL;
6375         int i, rc;
6376 
6377         if (host->flags & ATA_HOST_STARTED)
6378                 return 0;
6379 
6380         ata_finalize_port_ops(host->ops);
6381 
6382         for (i = 0; i < host->n_ports; i++) {
6383                 struct ata_port *ap = host->ports[i];
6384 
6385                 ata_finalize_port_ops(ap->ops);
6386 
6387                 if (!host->ops && !ata_port_is_dummy(ap))
6388                         host->ops = ap->ops;
6389 
6390                 if (ap->ops->port_stop)
6391                         have_stop = 1;
6392         }
6393 
6394         if (host->ops->host_stop)
6395                 have_stop = 1;
6396 
6397         if (have_stop) {
6398                 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
6399                 if (!start_dr)
6400                         return -ENOMEM;
6401         }
6402 
6403         for (i = 0; i < host->n_ports; i++) {
6404                 struct ata_port *ap = host->ports[i];
6405 
6406                 if (ap->ops->port_start) {
6407                         rc = ap->ops->port_start(ap);
6408                         if (rc) {
6409                                 if (rc != -ENODEV)
6410                                         dev_err(host->dev,
6411                                                 "failed to start port %d (errno=%d)\n",
6412                                                 i, rc);
6413                                 goto err_out;
6414                         }
6415                 }
6416                 ata_eh_freeze_port(ap);
6417         }
6418 
6419         if (start_dr)
6420                 devres_add(host->dev, start_dr);
6421         host->flags |= ATA_HOST_STARTED;
6422         return 0;
6423 
6424  err_out:
6425         while (--i >= 0) {
6426                 struct ata_port *ap = host->ports[i];
6427 
6428                 if (ap->ops->port_stop)
6429                         ap->ops->port_stop(ap);
6430         }
6431         devres_free(start_dr);
6432         return rc;
6433 }
6434 
6435 /**
6436  *      ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
6437  *      @host:  host to initialize
6438  *      @dev:   device host is attached to
6439  *      @ops:   port_ops
6440  *
6441  */
6442 void ata_host_init(struct ata_host *host, struct device *dev,
6443                    struct ata_port_operations *ops)
6444 {
6445         spin_lock_init(&host->lock);
6446         mutex_init(&host->eh_mutex);
6447         host->n_tags = ATA_MAX_QUEUE;
6448         host->dev = dev;
6449         host->ops = ops;
6450         kref_init(&host->kref);
6451 }
6452 
6453 void __ata_port_probe(struct ata_port *ap)
6454 {
6455         struct ata_eh_info *ehi = &ap->link.eh_info;
6456         unsigned long flags;
6457 
6458         /* kick EH for boot probing */
6459         spin_lock_irqsave(ap->lock, flags);
6460 
6461         ehi->probe_mask |= ATA_ALL_DEVICES;
6462         ehi->action |= ATA_EH_RESET;
6463         ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6464 
6465         ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6466         ap->pflags |= ATA_PFLAG_LOADING;
6467         ata_port_schedule_eh(ap);
6468 
6469         spin_unlock_irqrestore(ap->lock, flags);
6470 }
6471 
6472 int ata_port_probe(struct ata_port *ap)
6473 {
6474         int rc = 0;
6475 
6476         if (ap->ops->error_handler) {
6477                 __ata_port_probe(ap);
6478                 ata_port_wait_eh(ap);
6479         } else {
6480                 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6481                 rc = ata_bus_probe(ap);
6482                 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6483         }
6484         return rc;
6485 }
6486 
6487 
6488 static void async_port_probe(void *data, async_cookie_t cookie)
6489 {
6490         struct ata_port *ap = data;
6491 
6492         /*
6493          * If we're not allowed to scan this host in parallel,
6494          * we need to wait until all previous scans have completed
6495          * before going further.
6496          * Jeff Garzik says this is only within a controller, so we
6497          * don't need to wait for port 0, only for later ports.
6498          */
6499         if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6500                 async_synchronize_cookie(cookie);
6501 
6502         (void)ata_port_probe(ap);
6503 
6504         /* in order to keep device order, we need to synchronize at this point */
6505         async_synchronize_cookie(cookie);
6506 
6507         ata_scsi_scan_host(ap, 1);
6508 }
6509 
6510 /**
6511  *      ata_host_register - register initialized ATA host
6512  *      @host: ATA host to register
6513  *      @sht: template for SCSI host
6514  *
6515  *      Register initialized ATA host.  @host is allocated using
6516  *      ata_host_alloc() and fully initialized by LLD.  This function
6517  *      starts ports, registers @host with ATA and SCSI layers and
6518  *      probe registered devices.
6519  *
6520  *      LOCKING:
6521  *      Inherited from calling layer (may sleep).
6522  *
6523  *      RETURNS:
6524  *      0 on success, -errno otherwise.
6525  */
6526 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6527 {
6528         int i, rc;
6529 
6530         host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE);
6531 
6532         /* host must have been started */
6533         if (!(host->flags & ATA_HOST_STARTED)) {
6534                 dev_err(host->dev, "BUG: trying to register unstarted host\n");
6535                 WARN_ON(1);
6536                 return -EINVAL;
6537         }
6538 
6539         /* Blow away unused ports.  This happens when LLD can't
6540          * determine the exact number of ports to allocate at
6541          * allocation time.
6542          */
6543         for (i = host->n_ports; host->ports[i]; i++)
6544                 kfree(host->ports[i]);
6545 
6546         /* give ports names and add SCSI hosts */
6547         for (i = 0; i < host->n_ports; i++) {
6548                 host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
6549                 host->ports[i]->local_port_no = i + 1;
6550         }
6551 
6552         /* Create associated sysfs transport objects  */
6553         for (i = 0; i < host->n_ports; i++) {
6554                 rc = ata_tport_add(host->dev,host->ports[i]);
6555                 if (rc) {
6556                         goto err_tadd;
6557                 }
6558         }
6559 
6560         rc = ata_scsi_add_hosts(host, sht);
6561         if (rc)
6562                 goto err_tadd;
6563 
6564         /* set cable, sata_spd_limit and report */
6565         for (i = 0; i < host->n_ports; i++) {
6566                 struct ata_port *ap = host->ports[i];
6567                 unsigned long xfer_mask;
6568 
6569                 /* set SATA cable type if still unset */
6570                 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6571                         ap->cbl = ATA_CBL_SATA;
6572 
6573                 /* init sata_spd_limit to the current value */
6574                 sata_link_init_spd(&ap->link);
6575                 if (ap->slave_link)
6576                         sata_link_init_spd(ap->slave_link);
6577 
6578                 /* print per-port info to dmesg */
6579                 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6580                                               ap->udma_mask);
6581 
6582                 if (!ata_port_is_dummy(ap)) {
6583                         ata_port_info(ap, "%cATA max %s %s\n",
6584                                       (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6585                                       ata_mode_string(xfer_mask),
6586                                       ap->link.eh_info.desc);
6587                         ata_ehi_clear_desc(&ap->link.eh_info);
6588                 } else
6589                         ata_port_info(ap, "DUMMY\n");
6590         }
6591 
6592         /* perform each probe asynchronously */
6593         for (i = 0; i < host->n_ports; i++) {
6594                 struct ata_port *ap = host->ports[i];
6595                 async_schedule(async_port_probe, ap);
6596         }
6597 
6598         return 0;
6599 
6600  err_tadd:
6601         while (--i >= 0) {
6602                 ata_tport_delete(host->ports[i]);
6603         }
6604         return rc;
6605 
6606 }
6607 
6608 /**
6609  *      ata_host_activate - start host, request IRQ and register it
6610  *      @host: target ATA host
6611  *      @irq: IRQ to request
6612  *      @irq_handler: irq_handler used when requesting IRQ
6613  *      @irq_flags: irq_flags used when requesting IRQ
6614  *      @sht: scsi_host_template to use when registering the host
6615  *
6616  *      After allocating an ATA host and initializing it, most libata
6617  *      LLDs perform three steps to activate the host - start host,
6618  *      request IRQ and register it.  This helper takes necessary
6619  *      arguments and performs the three steps in one go.
6620  *
6621  *      An invalid IRQ skips the IRQ registration and expects the host to
6622  *      have set polling mode on the port. In this case, @irq_handler
6623  *      should be NULL.
6624  *
6625  *      LOCKING:
6626  *      Inherited from calling layer (may sleep).
6627  *
6628  *      RETURNS:
6629  *      0 on success, -errno otherwise.
6630  */
6631 int ata_host_activate(struct ata_host *host, int irq,
6632                       irq_handler_t irq_handler, unsigned long irq_flags,
6633                       struct scsi_host_template *sht)
6634 {
6635         int i, rc;
6636         char *irq_desc;
6637 
6638         rc = ata_host_start(host);
6639         if (rc)
6640                 return rc;
6641 
6642         /* Special case for polling mode */
6643         if (!irq) {
6644                 WARN_ON(irq_handler);
6645                 return ata_host_register(host, sht);
6646         }
6647 
6648         irq_desc = devm_kasprintf(host->dev, GFP_KERNEL, "%s[%s]",
6649                                   dev_driver_string(host->dev),
6650                                   dev_name(host->dev));
6651         if (!irq_desc)
6652                 return -ENOMEM;
6653 
6654         rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6655                               irq_desc, host);
6656         if (rc)
6657                 return rc;
6658 
6659         for (i = 0; i < host->n_ports; i++)
6660                 ata_port_desc(host->ports[i], "irq %d", irq);
6661 
6662         rc = ata_host_register(host, sht);
6663         /* if failed, just free the IRQ and leave ports alone */
6664         if (rc)
6665                 devm_free_irq(host->dev, irq, host);
6666 
6667         return rc;
6668 }
6669 
6670 /**
6671  *      ata_port_detach - Detach ATA port in preparation of device removal
6672  *      @ap: ATA port to be detached
6673  *
6674  *      Detach all ATA devices and the associated SCSI devices of @ap;
6675  *      then, remove the associated SCSI host.  @ap is guaranteed to
6676  *      be quiescent on return from this function.
6677  *
6678  *      LOCKING:
6679  *      Kernel thread context (may sleep).
6680  */
6681 static void ata_port_detach(struct ata_port *ap)
6682 {
6683         unsigned long flags;
6684         struct ata_link *link;
6685         struct ata_device *dev;
6686 
6687         if (!ap->ops->error_handler)
6688                 goto skip_eh;
6689 
6690         /* tell EH we're leaving & flush EH */
6691         spin_lock_irqsave(ap->lock, flags);
6692         ap->pflags |= ATA_PFLAG_UNLOADING;
6693         ata_port_schedule_eh(ap);
6694         spin_unlock_irqrestore(ap->lock, flags);
6695 
6696         /* wait till EH commits suicide */
6697         ata_port_wait_eh(ap);
6698 
6699         /* it better be dead now */
6700         WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6701 
6702         cancel_delayed_work_sync(&ap->hotplug_task);
6703 
6704  skip_eh:
6705         /* clean up zpodd on port removal */
6706         ata_for_each_link(link, ap, HOST_FIRST) {
6707                 ata_for_each_dev(dev, link, ALL) {
6708                         if (zpodd_dev_enabled(dev))
6709                                 zpodd_exit(dev);
6710                 }
6711         }
6712         if (ap->pmp_link) {
6713                 int i;
6714                 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
6715                         ata_tlink_delete(&ap->pmp_link[i]);
6716         }
6717         /* remove the associated SCSI host */
6718         scsi_remove_host(ap->scsi_host);
6719         ata_tport_delete(ap);
6720 }
6721 
6722 /**
6723  *      ata_host_detach - Detach all ports of an ATA host
6724  *      @host: Host to detach
6725  *
6726  *      Detach all ports of @host.
6727  *
6728  *      LOCKING:
6729  *      Kernel thread context (may sleep).
6730  */
6731 void ata_host_detach(struct ata_host *host)
6732 {
6733         int i;
6734 
6735         /* Ensure ata_port probe has completed */
6736         async_synchronize_full();
6737 
6738         for (i = 0; i < host->n_ports; i++)
6739                 ata_port_detach(host->ports[i]);
6740 
6741         /* the host is dead now, dissociate ACPI */
6742         ata_acpi_dissociate(host);
6743 }
6744 
6745 #ifdef CONFIG_PCI
6746 
6747 /**
6748  *      ata_pci_remove_one - PCI layer callback for device removal
6749  *      @pdev: PCI device that was removed
6750  *
6751  *      PCI layer indicates to libata via this hook that hot-unplug or
6752  *      module unload event has occurred.  Detach all ports.  Resource
6753  *      release is handled via devres.
6754  *
6755  *      LOCKING:
6756  *      Inherited from PCI layer (may sleep).
6757  */
6758 void ata_pci_remove_one(struct pci_dev *pdev)
6759 {
6760         struct ata_host *host = pci_get_drvdata(pdev);
6761 
6762         ata_host_detach(host);
6763 }
6764 
6765 void ata_pci_shutdown_one(struct pci_dev *pdev)
6766 {
6767         struct ata_host *host = pci_get_drvdata(pdev);
6768         int i;
6769 
6770         for (i = 0; i < host->n_ports; i++) {
6771                 struct ata_port *ap = host->ports[i];
6772 
6773                 ap->pflags |= ATA_PFLAG_FROZEN;
6774 
6775                 /* Disable port interrupts */
6776                 if (ap->ops->freeze)
6777                         ap->ops->freeze(ap);
6778 
6779                 /* Stop the port DMA engines */
6780                 if (ap->ops->port_stop)
6781                         ap->ops->port_stop(ap);
6782         }
6783 }
6784 
6785 /* move to PCI subsystem */
6786 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6787 {
6788         unsigned long tmp = 0;
6789 
6790         switch (bits->width) {
6791         case 1: {
6792                 u8 tmp8 = 0;
6793                 pci_read_config_byte(pdev, bits->reg, &tmp8);
6794                 tmp = tmp8;
6795                 break;
6796         }
6797         case 2: {
6798                 u16 tmp16 = 0;
6799                 pci_read_config_word(pdev, bits->reg, &tmp16);
6800                 tmp = tmp16;
6801                 break;
6802         }
6803         case 4: {
6804                 u32 tmp32 = 0;
6805                 pci_read_config_dword(pdev, bits->reg, &tmp32);
6806                 tmp = tmp32;
6807                 break;
6808         }
6809 
6810         default:
6811                 return -EINVAL;
6812         }
6813 
6814         tmp &= bits->mask;
6815 
6816         return (tmp == bits->val) ? 1 : 0;
6817 }
6818 
6819 #ifdef CONFIG_PM
6820 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6821 {
6822         pci_save_state(pdev);
6823         pci_disable_device(pdev);
6824 
6825         if (mesg.event & PM_EVENT_SLEEP)
6826                 pci_set_power_state(pdev, PCI_D3hot);
6827 }
6828 
6829 int ata_pci_device_do_resume(struct pci_dev *pdev)
6830 {
6831         int rc;
6832 
6833         pci_set_power_state(pdev, PCI_D0);
6834         pci_restore_state(pdev);
6835 
6836         rc = pcim_enable_device(pdev);
6837         if (rc) {
6838                 dev_err(&pdev->dev,
6839                         "failed to enable device after resume (%d)\n", rc);
6840                 return rc;
6841         }
6842 
6843         pci_set_master(pdev);
6844         return 0;
6845 }
6846 
6847 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6848 {
6849         struct ata_host *host = pci_get_drvdata(pdev);
6850         int rc = 0;
6851 
6852         rc = ata_host_suspend(host, mesg);
6853         if (rc)
6854                 return rc;
6855 
6856         ata_pci_device_do_suspend(pdev, mesg);
6857 
6858         return 0;
6859 }
6860 
6861 int ata_pci_device_resume(struct pci_dev *pdev)
6862 {
6863         struct ata_host *host = pci_get_drvdata(pdev);
6864         int rc;
6865 
6866         rc = ata_pci_device_do_resume(pdev);
6867         if (rc == 0)
6868                 ata_host_resume(host);
6869         return rc;
6870 }
6871 #endif /* CONFIG_PM */
6872 
6873 #endif /* CONFIG_PCI */
6874 
6875 /**
6876  *      ata_platform_remove_one - Platform layer callback for device removal
6877  *      @pdev: Platform device that was removed
6878  *
6879  *      Platform layer indicates to libata via this hook that hot-unplug or
6880  *      module unload event has occurred.  Detach all ports.  Resource
6881  *      release is handled via devres.
6882  *
6883  *      LOCKING:
6884  *      Inherited from platform layer (may sleep).
6885  */
6886 int ata_platform_remove_one(struct platform_device *pdev)
6887 {
6888         struct ata_host *host = platform_get_drvdata(pdev);
6889 
6890         ata_host_detach(host);
6891 
6892         return 0;
6893 }
6894 
6895 static int __init ata_parse_force_one(char **cur,
6896                                       struct ata_force_ent *force_ent,
6897                                       const char **reason)
6898 {
6899         static const struct ata_force_param force_tbl[] __initconst = {
6900                 { "40c",        .cbl            = ATA_CBL_PATA40 },
6901                 { "80c",        .cbl            = ATA_CBL_PATA80 },
6902                 { "short40c",   .cbl            = ATA_CBL_PATA40_SHORT },
6903                 { "unk",        .cbl            = ATA_CBL_PATA_UNK },
6904                 { "ign",        .cbl            = ATA_CBL_PATA_IGN },
6905                 { "sata",       .cbl            = ATA_CBL_SATA },
6906                 { "1.5Gbps",    .spd_limit      = 1 },
6907                 { "3.0Gbps",    .spd_limit      = 2 },
6908                 { "noncq",      .horkage_on     = ATA_HORKAGE_NONCQ },
6909                 { "ncq",        .horkage_off    = ATA_HORKAGE_NONCQ },
6910                 { "noncqtrim",  .horkage_on     = ATA_HORKAGE_NO_NCQ_TRIM },
6911                 { "ncqtrim",    .horkage_off    = ATA_HORKAGE_NO_NCQ_TRIM },
6912                 { "dump_id",    .horkage_on     = ATA_HORKAGE_DUMP_ID },
6913                 { "pio0",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 0) },
6914                 { "pio1",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 1) },
6915                 { "pio2",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 2) },
6916                 { "pio3",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 3) },
6917                 { "pio4",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 4) },
6918                 { "pio5",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 5) },
6919                 { "pio6",       .xfer_mask      = 1 << (ATA_SHIFT_PIO + 6) },
6920                 { "mwdma0",     .xfer_mask      = 1 << (ATA_SHIFT_MWDMA + 0) },
6921                 { "mwdma1",     .xfer_mask      = 1 << (ATA_SHIFT_MWDMA + 1) },
6922                 { "mwdma2",     .xfer_mask      = 1 << (ATA_SHIFT_MWDMA + 2) },
6923                 { "mwdma3",     .xfer_mask      = 1 << (ATA_SHIFT_MWDMA + 3) },
6924                 { "mwdma4",     .xfer_mask      = 1 << (ATA_SHIFT_MWDMA + 4) },
6925                 { "udma0",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 0) },
6926                 { "udma16",     .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 0) },
6927                 { "udma/16",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 0) },
6928                 { "udma1",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 1) },
6929                 { "udma25",     .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 1) },
6930                 { "udma/25",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 1) },
6931                 { "udma2",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 2) },
6932                 { "udma33",     .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 2) },
6933                 { "udma/33",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 2) },
6934                 { "udma3",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 3) },
6935                 { "udma44",     .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 3) },
6936                 { "udma/44",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 3) },
6937                 { "udma4",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 4) },
6938                 { "udma66",     .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 4) },
6939                 { "udma/66",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 4) },
6940                 { "udma5",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 5) },
6941                 { "udma100",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 5) },
6942                 { "udma/100",   .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 5) },
6943                 { "udma6",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 6) },
6944                 { "udma133",    .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 6) },
6945                 { "udma/133",   .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 6) },
6946                 { "udma7",      .xfer_mask      = 1 << (ATA_SHIFT_UDMA + 7) },
6947                 { "nohrst",     .lflags         = ATA_LFLAG_NO_HRST },
6948                 { "nosrst",     .lflags         = ATA_LFLAG_NO_SRST },
6949                 { "norst",      .lflags         = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6950                 { "rstonce",    .lflags         = ATA_LFLAG_RST_ONCE },
6951                 { "atapi_dmadir", .horkage_on   = ATA_HORKAGE_ATAPI_DMADIR },
6952                 { "disable",    .horkage_on     = ATA_HORKAGE_DISABLE },
6953         };
6954         char *start = *cur, *p = *cur;
6955         char *id, *val, *endp;
6956         const struct ata_force_param *match_fp = NULL;
6957         int nr_matches = 0, i;
6958 
6959         /* find where this param ends and update *cur */
6960         while (*p != '\0' && *p != ',')
6961                 p++;
6962 
6963         if (*p == '\0')
6964                 *cur = p;
6965         else
6966                 *cur = p + 1;
6967 
6968         *p = '\0';
6969 
6970         /* parse */
6971         p = strchr(start, ':');
6972         if (!p) {
6973                 val = strstrip(start);
6974                 goto parse_val;
6975         }
6976         *p = '\0';
6977 
6978         id = strstrip(start);
6979         val = strstrip(p + 1);
6980 
6981         /* parse id */
6982         p = strchr(id, '.');
6983         if (p) {
6984                 *p++ = '\0';
6985                 force_ent->device = simple_strtoul(p, &endp, 10);
6986                 if (p == endp || *endp != '\0') {
6987                         *reason = "invalid device";
6988                         return -EINVAL;
6989                 }
6990         }
6991 
6992         force_ent->port = simple_strtoul(id, &endp, 10);
6993         if (id == endp || *endp != '\0') {
6994                 *reason = "invalid port/link";
6995                 return -EINVAL;
6996         }
6997 
6998  parse_val:
6999         /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
7000         for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
7001                 const struct ata_force_param *fp = &force_tbl[i];
7002 
7003                 if (strncasecmp(val, fp->name, strlen(val)))
7004                         continue;
7005 
7006                 nr_matches++;
7007                 match_fp = fp;
7008 
7009                 if (strcasecmp(val, fp->name) == 0) {
7010                         nr_matches = 1;
7011                         break;
7012                 }
7013         }
7014 
7015         if (!nr_matches) {
7016                 *reason = "unknown value";
7017                 return -EINVAL;
7018         }
7019         if (nr_matches > 1) {
7020                 *reason = "ambiguous value";
7021                 return -EINVAL;
7022         }
7023 
7024         force_ent->param = *match_fp;
7025 
7026         return 0;
7027 }
7028 
7029 static void __init ata_parse_force_param(void)
7030 {
7031         int idx = 0, size = 1;
7032         int last_port = -1, last_device = -1;
7033         char *p, *cur, *next;
7034 
7035         /* calculate maximum number of params and allocate force_tbl */
7036         for (p = ata_force_param_buf; *p; p++)
7037                 if (*p == ',')
7038                         size++;
7039 
7040         ata_force_tbl = kcalloc(size, sizeof(ata_force_tbl[0]), GFP_KERNEL);
7041         if (!ata_force_tbl) {
7042                 printk(KERN_WARNING "ata: failed to extend force table, "
7043                        "libata.force ignored\n");
7044                 return;
7045         }
7046 
7047         /* parse and populate the table */
7048         for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
7049                 const char *reason = "";
7050                 struct ata_force_ent te = { .port = -1, .device = -1 };
7051 
7052                 next = cur;
7053                 if (ata_parse_force_one(&next, &te, &reason)) {
7054                         printk(KERN_WARNING "ata: failed to parse force "
7055                                "parameter \"%s\" (%s)\n",
7056                                cur, reason);
7057                         continue;
7058                 }
7059 
7060                 if (te.port == -1) {
7061                         te.port = last_port;
7062                         te.device = last_device;
7063                 }
7064 
7065                 ata_force_tbl[idx++] = te;
7066 
7067                 last_port = te.port;
7068                 last_device = te.device;
7069         }
7070 
7071         ata_force_tbl_size = idx;
7072 }
7073 
7074 static int __init ata_init(void)
7075 {
7076         int rc;
7077 
7078         ata_parse_force_param();
7079 
7080         rc = ata_sff_init();
7081         if (rc) {
7082                 kfree(ata_force_tbl);
7083                 return rc;
7084         }
7085 
7086         libata_transport_init();
7087         ata_scsi_transport_template = ata_attach_transport();
7088         if (!ata_scsi_transport_template) {
7089                 ata_sff_exit();
7090                 rc = -ENOMEM;
7091                 goto err_out;
7092         }
7093 
7094         printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
7095         return 0;
7096 
7097 err_out:
7098         return rc;
7099 }
7100 
7101 static void __exit ata_exit(void)
7102 {
7103         ata_release_transport(ata_scsi_transport_template);
7104         libata_transport_exit();
7105         ata_sff_exit();
7106         kfree(ata_force_tbl);
7107 }
7108 
7109 subsys_initcall(ata_init);
7110 module_exit(ata_exit);
7111 
7112 static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
7113 
7114 int ata_ratelimit(void)
7115 {
7116         return __ratelimit(&ratelimit);
7117 }
7118 
7119 /**
7120  *      ata_msleep - ATA EH owner aware msleep
7121  *      @ap: ATA port to attribute the sleep to
7122  *      @msecs: duration to sleep in milliseconds
7123  *
7124  *      Sleeps @msecs.  If the current task is owner of @ap's EH, the
7125  *      ownership is released before going to sleep and reacquired
7126  *      after the sleep is complete.  IOW, other ports sharing the
7127  *      @ap->host will be allowed to own the EH while this task is
7128  *      sleeping.
7129  *
7130  *      LOCKING:
7131  *      Might sleep.
7132  */
7133 void ata_msleep(struct ata_port *ap, unsigned int msecs)
7134 {
7135         bool owns_eh = ap && ap->host->eh_owner == current;
7136 
7137         if (owns_eh)
7138                 ata_eh_release(ap);
7139 
7140         if (msecs < 20) {
7141                 unsigned long usecs = msecs * USEC_PER_MSEC;
7142                 usleep_range(usecs, usecs + 50);
7143         } else {
7144                 msleep(msecs);
7145         }
7146 
7147         if (owns_eh)
7148                 ata_eh_acquire(ap);
7149 }
7150 
7151 /**
7152  *      ata_wait_register - wait until register value changes
7153  *      @ap: ATA port to wait register for, can be NULL
7154  *      @reg: IO-mapped register
7155  *      @mask: Mask to apply to read register value
7156  *      @val: Wait condition
7157  *      @interval: polling interval in milliseconds
7158  *      @timeout: timeout in milliseconds
7159  *
7160  *      Waiting for some bits of register to change is a common
7161  *      operation for ATA controllers.  This function reads 32bit LE
7162  *      IO-mapped register @reg and tests for the following condition.
7163  *
7164  *      (*@reg & mask) != val
7165  *
7166  *      If the condition is met, it returns; otherwise, the process is
7167  *      repeated after @interval_msec until timeout.
7168  *
7169  *      LOCKING:
7170  *      Kernel thread context (may sleep)
7171  *
7172  *      RETURNS:
7173  *      The final register value.
7174  */
7175 u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
7176                       unsigned long interval, unsigned long timeout)
7177 {
7178         unsigned long deadline;
7179         u32 tmp;
7180 
7181         tmp = ioread32(reg);
7182 
7183         /* Calculate timeout _after_ the first read to make sure
7184          * preceding writes reach the controller before starting to
7185          * eat away the timeout.
7186          */
7187         deadline = ata_deadline(jiffies, timeout);
7188 
7189         while ((tmp & mask) == val && time_before(jiffies, deadline)) {
7190                 ata_msleep(ap, interval);
7191                 tmp = ioread32(reg);
7192         }
7193 
7194         return tmp;
7195 }
7196 
7197 /**
7198  *      sata_lpm_ignore_phy_events - test if PHY event should be ignored
7199  *      @link: Link receiving the event
7200  *
7201  *      Test whether the received PHY event has to be ignored or not.
7202  *
7203  *      LOCKING:
7204  *      None:
7205  *
7206  *      RETURNS:
7207  *      True if the event has to be ignored.
7208  */
7209 bool sata_lpm_ignore_phy_events(struct ata_link *link)
7210 {
7211         unsigned long lpm_timeout = link->last_lpm_change +
7212                                     msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
7213 
7214         /* if LPM is enabled, PHYRDY doesn't mean anything */
7215         if (link->lpm_policy > ATA_LPM_MAX_POWER)
7216                 return true;
7217 
7218         /* ignore the first PHY event after the LPM policy changed
7219          * as it is might be spurious
7220          */
7221         if ((link->flags & ATA_LFLAG_CHANGED) &&
7222             time_before(jiffies, lpm_timeout))
7223                 return true;
7224 
7225         return false;
7226 }
7227 EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
7228 
7229 /*
7230  * Dummy port_ops
7231  */
7232 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
7233 {
7234         return AC_ERR_SYSTEM;
7235 }
7236 
7237 static void ata_dummy_error_handler(struct ata_port *ap)
7238 {
7239         /* truly dummy */
7240 }
7241 
7242 struct ata_port_operations ata_dummy_port_ops = {
7243         .qc_prep                = ata_noop_qc_prep,
7244         .qc_issue               = ata_dummy_qc_issue,
7245         .error_handler          = ata_dummy_error_handler,
7246         .sched_eh               = ata_std_sched_eh,
7247         .end_eh                 = ata_std_end_eh,
7248 };
7249 
7250 const struct ata_port_info ata_dummy_port_info = {
7251         .port_ops               = &ata_dummy_port_ops,
7252 };
7253 
7254 /*
7255  * Utility print functions
7256  */
7257 void ata_port_printk(const struct ata_port *ap, const char *level,
7258                      const char *fmt, ...)
7259 {
7260         struct va_format vaf;
7261         va_list args;
7262 
7263         va_start(args, fmt);
7264 
7265         vaf.fmt = fmt;
7266         vaf.va = &args;
7267 
7268         printk("%sata%u: %pV", level, ap->print_id, &vaf);
7269 
7270         va_end(args);
7271 }
7272 EXPORT_SYMBOL(ata_port_printk);
7273 
7274 void ata_link_printk(const struct ata_link *link, const char *level,
7275                      const char *fmt, ...)
7276 {
7277         struct va_format vaf;
7278         va_list args;
7279 
7280         va_start(args, fmt);
7281 
7282         vaf.fmt = fmt;
7283         vaf.va = &args;
7284 
7285         if (sata_pmp_attached(link->ap) || link->ap->slave_link)
7286                 printk("%sata%u.%02u: %pV",
7287                        level, link->ap->print_id, link->pmp, &vaf);
7288         else
7289                 printk("%sata%u: %pV",
7290                        level, link->ap->print_id, &vaf);
7291 
7292         va_end(args);
7293 }
7294 EXPORT_SYMBOL(ata_link_printk);
7295 
7296 void ata_dev_printk(const struct ata_device *dev, const char *level,
7297                     const char *fmt, ...)
7298 {
7299         struct va_format vaf;
7300         va_list args;
7301 
7302         va_start(args, fmt);
7303 
7304         vaf.fmt = fmt;
7305         vaf.va = &args;
7306 
7307         printk("%sata%u.%02u: %pV",
7308                level, dev->link->ap->print_id, dev->link->pmp + dev->devno,
7309                &vaf);
7310 
7311         va_end(args);
7312 }
7313 EXPORT_SYMBOL(ata_dev_printk);
7314 
7315 void ata_print_version(const struct device *dev, const char *version)
7316 {
7317         dev_printk(KERN_DEBUG, dev, "version %s\n", version);
7318 }
7319 EXPORT_SYMBOL(ata_print_version);
7320 
7321 /*
7322  * libata is essentially a library of internal helper functions for
7323  * low-level ATA host controller drivers.  As such, the API/ABI is
7324  * likely to change as new drivers are added and updated.
7325  * Do not depend on ABI/API stability.
7326  */
7327 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7328 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7329 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7330 EXPORT_SYMBOL_GPL(ata_base_port_ops);
7331 EXPORT_SYMBOL_GPL(sata_port_ops);
7332 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7333 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7334 EXPORT_SYMBOL_GPL(ata_link_next);
7335 EXPORT_SYMBOL_GPL(ata_dev_next);
7336 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7337 EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
7338 EXPORT_SYMBOL_GPL(ata_host_init);
7339 EXPORT_SYMBOL_GPL(ata_host_alloc);
7340 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7341 EXPORT_SYMBOL_GPL(ata_slave_link_init);
7342 EXPORT_SYMBOL_GPL(ata_host_start);
7343 EXPORT_SYMBOL_GPL(ata_host_register);
7344 EXPORT_SYMBOL_GPL(ata_host_activate);
7345 EXPORT_SYMBOL_GPL(ata_host_detach);
7346 EXPORT_SYMBOL_GPL(ata_sg_init);
7347 EXPORT_SYMBOL_GPL(ata_qc_complete);
7348 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7349 EXPORT_SYMBOL_GPL(atapi_cmd_type);
7350 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7351 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7352 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
7353 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
7354 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
7355 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
7356 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
7357 EXPORT_SYMBOL_GPL(ata_mode_string);
7358 EXPORT_SYMBOL_GPL(ata_id_xfermask);
7359 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7360 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
7361 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7362 EXPORT_SYMBOL_GPL(ata_dev_disable);
7363 EXPORT_SYMBOL_GPL(sata_set_spd);
7364 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7365 EXPORT_SYMBOL_GPL(sata_link_debounce);
7366 EXPORT_SYMBOL_GPL(sata_link_resume);
7367 EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
7368 EXPORT_SYMBOL_GPL(ata_std_prereset);
7369 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7370 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7371 EXPORT_SYMBOL_GPL(ata_std_postreset);
7372 EXPORT_SYMBOL_GPL(ata_dev_classify);
7373 EXPORT_SYMBOL_GPL(ata_dev_pair);
7374 EXPORT_SYMBOL_GPL(ata_ratelimit);
7375 EXPORT_SYMBOL_GPL(ata_msleep);
7376 EXPORT_SYMBOL_GPL(ata_wait_register);
7377 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7378 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7379 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7380 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7381 EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
7382 EXPORT_SYMBOL_GPL(sata_scr_valid);
7383 EXPORT_SYMBOL_GPL(sata_scr_read);
7384 EXPORT_SYMBOL_GPL(sata_scr_write);
7385 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7386 EXPORT_SYMBOL_GPL(ata_link_online);
7387 EXPORT_SYMBOL_GPL(ata_link_offline);
7388 #ifdef CONFIG_PM
7389 EXPORT_SYMBOL_GPL(ata_host_suspend);
7390 EXPORT_SYMBOL_GPL(ata_host_resume);
7391 #endif /* CONFIG_PM */
7392 EXPORT_SYMBOL_GPL(ata_id_string);
7393 EXPORT_SYMBOL_GPL(ata_id_c_string);
7394 EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
7395 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7396 
7397 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7398 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
7399 EXPORT_SYMBOL_GPL(ata_timing_compute);
7400 EXPORT_SYMBOL_GPL(ata_timing_merge);
7401 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
7402 
7403 #ifdef CONFIG_PCI
7404 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7405 EXPORT_SYMBOL_GPL(ata_pci_shutdown_one);
7406 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7407 #ifdef CONFIG_PM
7408 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7409 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7410 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7411 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7412 #endif /* CONFIG_PM */
7413 #endif /* CONFIG_PCI */
7414 
7415 EXPORT_SYMBOL_GPL(ata_platform_remove_one);
7416 
7417 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7418 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7419 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7420 EXPORT_SYMBOL_GPL(ata_port_desc);
7421 #ifdef CONFIG_PCI
7422 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7423 #endif /* CONFIG_PCI */
7424 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7425 EXPORT_SYMBOL_GPL(ata_link_abort);
7426 EXPORT_SYMBOL_GPL(ata_port_abort);
7427 EXPORT_SYMBOL_GPL(ata_port_freeze);
7428 EXPORT_SYMBOL_GPL(sata_async_notification);
7429 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7430 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7431 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7432 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7433 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
7434 EXPORT_SYMBOL_GPL(ata_do_eh);
7435 EXPORT_SYMBOL_GPL(ata_std_error_handler);
7436 
7437 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7438 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7439 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7440 EXPORT_SYMBOL_GPL(ata_cable_ignore);
7441 EXPORT_SYMBOL_GPL(ata_cable_sata);
7442 EXPORT_SYMBOL_GPL(ata_host_get);
7443 EXPORT_SYMBOL_GPL(ata_host_put);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/ata/libata-core.c

DEFINITIONS
