drivers/block/mtip32xx/mtip32xx.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
mtip_check_surprise_removal
mtip_cmd_from_tag
mtip_hba_reset
mtip_issue_ncq_command
mtip_enable_fis
mtip_enable_engine
mtip_start_port
mtip_deinit_port
mtip_init_port
mtip_restart_port
mtip_device_reset
print_tags
mtip_complete_command
mtip_handle_tfe
mtip_workq_sdbfx
mtip_process_legacy
mtip_process_errors
mtip_handle_irq
mtip_irq_handler
mtip_issue_non_ncq_command
mtip_pause_ncq
mtip_commands_active
mtip_quiesce_io
mtip_exec_internal_command
ata_swap_string
mtip_set_timeout
mtip_get_identify
mtip_standby_immediate
mtip_read_log_page
mtip_get_smart_data
mtip_get_smart_attr
mtip_hw_get_capacity
mtip_dump_identify
fill_command_sg
exec_drive_task
exec_drive_command
implicit_sector
exec_drive_taskfile
mtip_hw_ioctl
mtip_hw_submit_io
mtip_hw_show_status
show_device_status
mtip_hw_read_device_status
mtip_hw_read_registers
mtip_hw_read_flags
mtip_hw_sysfs_init
mtip_hw_sysfs_exit
mtip_hw_debugfs_init
mtip_hw_debugfs_exit
hba_setup
mtip_device_unaligned_constrained
mtip_detect_product
mtip_ftl_rebuild_poll
mtip_softirq_done_fn
mtip_abort_cmd
mtip_queue_cmd
mtip_service_thread
mtip_dma_free
mtip_dma_alloc
mtip_hw_get_identify
mtip_hw_init
mtip_standby_drive
mtip_hw_exit
mtip_hw_shutdown
mtip_hw_suspend
mtip_hw_resume
rssd_disk_name_format
mtip_block_ioctl
mtip_block_compat_ioctl
mtip_block_getgeo
mtip_block_open
mtip_block_release
is_se_active
is_stopped
mtip_check_unal_depth
mtip_issue_reserved_cmd
mtip_queue_rq
mtip_free_cmd
mtip_init_cmd
mtip_cmd_timeout
mtip_block_initialize
mtip_no_dev_cleanup
mtip_block_remove
mtip_block_shutdown
mtip_block_suspend
mtip_block_resume
drop_cpu
get_least_used_cpu_on_node
mtip_get_next_rr_node
mtip_disable_link_opts
mtip_fix_ero_nosnoop
mtip_pci_probe
mtip_pci_remove
mtip_pci_suspend
mtip_pci_resume
mtip_pci_shutdown
mtip_init
mtip_exit
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for the Micron P320 SSD
   4  *   Copyright (C) 2011 Micron Technology, Inc.
   5  *
   6  * Portions of this code were derived from works subjected to the
   7  * following copyright:
   8  *    Copyright (C) 2009 Integrated Device Technology, Inc.
   9  */
  10 
  11 #include <linux/pci.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/ata.h>
  14 #include <linux/delay.h>
  15 #include <linux/hdreg.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/random.h>
  18 #include <linux/smp.h>
  19 #include <linux/compat.h>
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/genhd.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/blk-mq.h>
  25 #include <linux/bio.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/idr.h>
  28 #include <linux/kthread.h>
  29 #include <../drivers/ata/ahci.h>
  30 #include <linux/export.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/prefetch.h>
  33 #include <linux/numa.h>
  34 #include "mtip32xx.h"
  35 
  36 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  37 
  38 /* DMA region containing RX Fis, Identify, RLE10, and SMART buffers */
  39 #define AHCI_RX_FIS_SZ          0x100
  40 #define AHCI_RX_FIS_OFFSET      0x0
  41 #define AHCI_IDFY_SZ            ATA_SECT_SIZE
  42 #define AHCI_IDFY_OFFSET        0x400
  43 #define AHCI_SECTBUF_SZ         ATA_SECT_SIZE
  44 #define AHCI_SECTBUF_OFFSET     0x800
  45 #define AHCI_SMARTBUF_SZ        ATA_SECT_SIZE
  46 #define AHCI_SMARTBUF_OFFSET    0xC00
  47 /* 0x100 + 0x200 + 0x200 + 0x200 is smaller than 4k but we pad it out */
  48 #define BLOCK_DMA_ALLOC_SZ      4096
  49 
  50 /* DMA region containing command table (should be 8192 bytes) */
  51 #define AHCI_CMD_SLOT_SZ        sizeof(struct mtip_cmd_hdr)
  52 #define AHCI_CMD_TBL_SZ         (MTIP_MAX_COMMAND_SLOTS * AHCI_CMD_SLOT_SZ)
  53 #define AHCI_CMD_TBL_OFFSET     0x0
  54 
  55 /* DMA region per command (contains header and SGL) */
  56 #define AHCI_CMD_TBL_HDR_SZ     0x80
  57 #define AHCI_CMD_TBL_HDR_OFFSET 0x0
  58 #define AHCI_CMD_TBL_SGL_SZ     (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
  59 #define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
  60 #define CMD_DMA_ALLOC_SZ        (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)
  61 
  62 
  63 #define HOST_CAP_NZDMA          (1 << 19)
  64 #define HOST_HSORG              0xFC
  65 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  66 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  67 #define HSORG_HWREV             0xFF00
  68 #define HSORG_STYLE             0x8
  69 #define HSORG_SLOTGROUPS        0x7
  70 
  71 #define PORT_COMMAND_ISSUE      0x38
  72 #define PORT_SDBV               0x7C
  73 
  74 #define PORT_OFFSET             0x100
  75 #define PORT_MEM_SIZE           0x80
  76 
  77 #define PORT_IRQ_ERR \
  78         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  79          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  80          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  81          PORT_IRQ_OVERFLOW)
  82 #define PORT_IRQ_LEGACY \
  83         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  84 #define PORT_IRQ_HANDLED \
  85         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  86          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  87          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  88 #define DEF_PORT_IRQ \
  89         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  90 
  91 /* product numbers */
  92 #define MTIP_PRODUCT_UNKNOWN    0x00
  93 #define MTIP_PRODUCT_ASICFPGA   0x11
  94 
  95 /* Device instance number, incremented each time a device is probed. */
  96 static int instance;
  97 
  98 static struct list_head online_list;
  99 static struct list_head removing_list;
 100 static spinlock_t dev_lock;
 101 
 102 /*
 103  * Global variable used to hold the major block device number
 104  * allocated in mtip_init().
 105  */
 106 static int mtip_major;
 107 static struct dentry *dfs_parent;
 108 static struct dentry *dfs_device_status;
 109 
 110 static u32 cpu_use[NR_CPUS];
 111 
 112 static DEFINE_IDA(rssd_index_ida);
 113 
 114 static int mtip_block_initialize(struct driver_data *dd);
 115 
 116 #ifdef CONFIG_COMPAT
 117 struct mtip_compat_ide_task_request_s {
 118         __u8            io_ports[8];
 119         __u8            hob_ports[8];
 120         ide_reg_valid_t out_flags;
 121         ide_reg_valid_t in_flags;
 122         int             data_phase;
 123         int             req_cmd;
 124         compat_ulong_t  out_size;
 125         compat_ulong_t  in_size;
 126 };
 127 #endif
 128 
 129 /*
 130  * This function check_for_surprise_removal is called
 131  * while card is removed from the system and it will
 132  * read the vendor id from the configration space
 133  *
 134  * @pdev Pointer to the pci_dev structure.
 135  *
 136  * return value
 137  *       true if device removed, else false
 138  */
 139 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 140 {
 141         u16 vendor_id = 0;
 142         struct driver_data *dd = pci_get_drvdata(pdev);
 143 
 144         if (dd->sr)
 145                 return true;
 146 
 147        /* Read the vendorID from the configuration space */
 148         pci_read_config_word(pdev, 0x00, &vendor_id);
 149         if (vendor_id == 0xFFFF) {
 150                 dd->sr = true;
 151                 if (dd->queue)
 152                         blk_queue_flag_set(QUEUE_FLAG_DEAD, dd->queue);
 153                 else
 154                         dev_warn(&dd->pdev->dev,
 155                                 "%s: dd->queue is NULL\n", __func__);
 156                 return true; /* device removed */
 157         }
 158 
 159         return false; /* device present */
 160 }
 161 
 162 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 163                                           unsigned int tag)
 164 {
 165         struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
 166 
 167         return blk_mq_rq_to_pdu(blk_mq_tag_to_rq(hctx->tags, tag));
 168 }
 169 
 170 /*
 171  * Reset the HBA (without sleeping)
 172  *
 173  * @dd Pointer to the driver data structure.
 174  *
 175  * return value
 176  *      0       The reset was successful.
 177  *      -1      The HBA Reset bit did not clear.
 178  */
 179 static int mtip_hba_reset(struct driver_data *dd)
 180 {
 181         unsigned long timeout;
 182 
 183         /* Set the reset bit */
 184         writel(HOST_RESET, dd->mmio + HOST_CTL);
 185 
 186         /* Flush */
 187         readl(dd->mmio + HOST_CTL);
 188 
 189         /*
 190          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 191          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 192          */
 193         timeout = jiffies + msecs_to_jiffies(10000);
 194         do {
 195                 mdelay(10);
 196                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 197                         return -1;
 198 
 199         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 200                  && time_before(jiffies, timeout));
 201 
 202         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 203                 return -1;
 204 
 205         return 0;
 206 }
 207 
 208 /*
 209  * Issue a command to the hardware.
 210  *
 211  * Set the appropriate bit in the s_active and Command Issue hardware
 212  * registers, causing hardware command processing to begin.
 213  *
 214  * @port Pointer to the port structure.
 215  * @tag  The tag of the command to be issued.
 216  *
 217  * return value
 218  *      None
 219  */
 220 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 221 {
 222         int group = tag >> 5;
 223 
 224         /* guard SACT and CI registers */
 225         spin_lock(&port->cmd_issue_lock[group]);
 226         writel((1 << MTIP_TAG_BIT(tag)),
 227                         port->s_active[MTIP_TAG_INDEX(tag)]);
 228         writel((1 << MTIP_TAG_BIT(tag)),
 229                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 230         spin_unlock(&port->cmd_issue_lock[group]);
 231 }
 232 
 233 /*
 234  * Enable/disable the reception of FIS
 235  *
 236  * @port   Pointer to the port data structure
 237  * @enable 1 to enable, 0 to disable
 238  *
 239  * return value
 240  *      Previous state: 1 enabled, 0 disabled
 241  */
 242 static int mtip_enable_fis(struct mtip_port *port, int enable)
 243 {
 244         u32 tmp;
 245 
 246         /* enable FIS reception */
 247         tmp = readl(port->mmio + PORT_CMD);
 248         if (enable)
 249                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 250         else
 251                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 252 
 253         /* Flush */
 254         readl(port->mmio + PORT_CMD);
 255 
 256         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 257 }
 258 
 259 /*
 260  * Enable/disable the DMA engine
 261  *
 262  * @port   Pointer to the port data structure
 263  * @enable 1 to enable, 0 to disable
 264  *
 265  * return value
 266  *      Previous state: 1 enabled, 0 disabled.
 267  */
 268 static int mtip_enable_engine(struct mtip_port *port, int enable)
 269 {
 270         u32 tmp;
 271 
 272         /* enable FIS reception */
 273         tmp = readl(port->mmio + PORT_CMD);
 274         if (enable)
 275                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 276         else
 277                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 278 
 279         readl(port->mmio + PORT_CMD);
 280         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 281 }
 282 
 283 /*
 284  * Enables the port DMA engine and FIS reception.
 285  *
 286  * return value
 287  *      None
 288  */
 289 static inline void mtip_start_port(struct mtip_port *port)
 290 {
 291         /* Enable FIS reception */
 292         mtip_enable_fis(port, 1);
 293 
 294         /* Enable the DMA engine */
 295         mtip_enable_engine(port, 1);
 296 }
 297 
 298 /*
 299  * Deinitialize a port by disabling port interrupts, the DMA engine,
 300  * and FIS reception.
 301  *
 302  * @port Pointer to the port structure
 303  *
 304  * return value
 305  *      None
 306  */
 307 static inline void mtip_deinit_port(struct mtip_port *port)
 308 {
 309         /* Disable interrupts on this port */
 310         writel(0, port->mmio + PORT_IRQ_MASK);
 311 
 312         /* Disable the DMA engine */
 313         mtip_enable_engine(port, 0);
 314 
 315         /* Disable FIS reception */
 316         mtip_enable_fis(port, 0);
 317 }
 318 
 319 /*
 320  * Initialize a port.
 321  *
 322  * This function deinitializes the port by calling mtip_deinit_port() and
 323  * then initializes it by setting the command header and RX FIS addresses,
 324  * clearing the SError register and any pending port interrupts before
 325  * re-enabling the default set of port interrupts.
 326  *
 327  * @port Pointer to the port structure.
 328  *
 329  * return value
 330  *      None
 331  */
 332 static void mtip_init_port(struct mtip_port *port)
 333 {
 334         int i;
 335         mtip_deinit_port(port);
 336 
 337         /* Program the command list base and FIS base addresses */
 338         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 339                 writel((port->command_list_dma >> 16) >> 16,
 340                          port->mmio + PORT_LST_ADDR_HI);
 341                 writel((port->rxfis_dma >> 16) >> 16,
 342                          port->mmio + PORT_FIS_ADDR_HI);
 343                 set_bit(MTIP_PF_HOST_CAP_64, &port->flags);
 344         }
 345 
 346         writel(port->command_list_dma & 0xFFFFFFFF,
 347                         port->mmio + PORT_LST_ADDR);
 348         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 349 
 350         /* Clear SError */
 351         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 352 
 353         /* reset the completed registers.*/
 354         for (i = 0; i < port->dd->slot_groups; i++)
 355                 writel(0xFFFFFFFF, port->completed[i]);
 356 
 357         /* Clear any pending interrupts for this port */
 358         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 359 
 360         /* Clear any pending interrupts on the HBA. */
 361         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 362                                         port->dd->mmio + HOST_IRQ_STAT);
 363 
 364         /* Enable port interrupts */
 365         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 366 }
 367 
 368 /*
 369  * Restart a port
 370  *
 371  * @port Pointer to the port data structure.
 372  *
 373  * return value
 374  *      None
 375  */
 376 static void mtip_restart_port(struct mtip_port *port)
 377 {
 378         unsigned long timeout;
 379 
 380         /* Disable the DMA engine */
 381         mtip_enable_engine(port, 0);
 382 
 383         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 384         timeout = jiffies + msecs_to_jiffies(500);
 385         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 386                  && time_before(jiffies, timeout))
 387                 ;
 388 
 389         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 390                 return;
 391 
 392         /*
 393          * Chip quirk: escalate to hba reset if
 394          * PxCMD.CR not clear after 500 ms
 395          */
 396         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 397                 dev_warn(&port->dd->pdev->dev,
 398                         "PxCMD.CR not clear, escalating reset\n");
 399 
 400                 if (mtip_hba_reset(port->dd))
 401                         dev_err(&port->dd->pdev->dev,
 402                                 "HBA reset escalation failed.\n");
 403 
 404                 /* 30 ms delay before com reset to quiesce chip */
 405                 mdelay(30);
 406         }
 407 
 408         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 409 
 410         /* Set PxSCTL.DET */
 411         writel(readl(port->mmio + PORT_SCR_CTL) |
 412                          1, port->mmio + PORT_SCR_CTL);
 413         readl(port->mmio + PORT_SCR_CTL);
 414 
 415         /* Wait 1 ms to quiesce chip function */
 416         timeout = jiffies + msecs_to_jiffies(1);
 417         while (time_before(jiffies, timeout))
 418                 ;
 419 
 420         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 421                 return;
 422 
 423         /* Clear PxSCTL.DET */
 424         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 425                          port->mmio + PORT_SCR_CTL);
 426         readl(port->mmio + PORT_SCR_CTL);
 427 
 428         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 429         timeout = jiffies + msecs_to_jiffies(500);
 430         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 431                          && time_before(jiffies, timeout))
 432                 ;
 433 
 434         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 435                 return;
 436 
 437         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 438                 dev_warn(&port->dd->pdev->dev,
 439                         "COM reset failed\n");
 440 
 441         mtip_init_port(port);
 442         mtip_start_port(port);
 443 
 444 }
 445 
 446 static int mtip_device_reset(struct driver_data *dd)
 447 {
 448         int rv = 0;
 449 
 450         if (mtip_check_surprise_removal(dd->pdev))
 451                 return 0;
 452 
 453         if (mtip_hba_reset(dd) < 0)
 454                 rv = -EFAULT;
 455 
 456         mdelay(1);
 457         mtip_init_port(dd->port);
 458         mtip_start_port(dd->port);
 459 
 460         /* Enable interrupts on the HBA. */
 461         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 462                                         dd->mmio + HOST_CTL);
 463         return rv;
 464 }
 465 
 466 /*
 467  * Helper function for tag logging
 468  */
 469 static void print_tags(struct driver_data *dd,
 470                         char *msg,
 471                         unsigned long *tagbits,
 472                         int cnt)
 473 {
 474         unsigned char tagmap[128];
 475         int group, tagmap_len = 0;
 476 
 477         memset(tagmap, 0, sizeof(tagmap));
 478         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 479                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 480                                                 tagbits[group-1]);
 481         dev_warn(&dd->pdev->dev,
 482                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 483 }
 484 
 485 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 486                                 dma_addr_t buffer_dma, unsigned int sectors);
 487 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 488                                                 struct smart_attr *attrib);
 489 
 490 static void mtip_complete_command(struct mtip_cmd *cmd, blk_status_t status)
 491 {
 492         struct request *req = blk_mq_rq_from_pdu(cmd);
 493 
 494         cmd->status = status;
 495         blk_mq_complete_request(req);
 496 }
 497 
 498 /*
 499  * Handle an error.
 500  *
 501  * @dd Pointer to the DRIVER_DATA structure.
 502  *
 503  * return value
 504  *      None
 505  */
 506 static void mtip_handle_tfe(struct driver_data *dd)
 507 {
 508         int group, tag, bit, reissue, rv;
 509         struct mtip_port *port;
 510         struct mtip_cmd  *cmd;
 511         u32 completed;
 512         struct host_to_dev_fis *fis;
 513         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 514         unsigned int cmd_cnt = 0;
 515         unsigned char *buf;
 516         char *fail_reason = NULL;
 517         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 518 
 519         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 520 
 521         port = dd->port;
 522 
 523         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 524                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 525                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 526                 mtip_complete_command(cmd, BLK_STS_IOERR);
 527                 return;
 528         }
 529 
 530         /* clear the tag accumulator */
 531         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 532 
 533         /* Loop through all the groups */
 534         for (group = 0; group < dd->slot_groups; group++) {
 535                 completed = readl(port->completed[group]);
 536 
 537                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 538 
 539                 /* clear completed status register in the hardware.*/
 540                 writel(completed, port->completed[group]);
 541 
 542                 /* Process successfully completed commands */
 543                 for (bit = 0; bit < 32 && completed; bit++) {
 544                         if (!(completed & (1<<bit)))
 545                                 continue;
 546                         tag = (group << 5) + bit;
 547 
 548                         /* Skip the internal command slot */
 549                         if (tag == MTIP_TAG_INTERNAL)
 550                                 continue;
 551 
 552                         cmd = mtip_cmd_from_tag(dd, tag);
 553                         mtip_complete_command(cmd, 0);
 554                         set_bit(tag, tagaccum);
 555                         cmd_cnt++;
 556                 }
 557         }
 558 
 559         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 560 
 561         /* Restart the port */
 562         mdelay(20);
 563         mtip_restart_port(port);
 564 
 565         /* Trying to determine the cause of the error */
 566         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 567                                 dd->port->log_buf,
 568                                 dd->port->log_buf_dma, 1);
 569         if (rv) {
 570                 dev_warn(&dd->pdev->dev,
 571                         "Error in READ LOG EXT (10h) command\n");
 572                 /* non-critical error, don't fail the load */
 573         } else {
 574                 buf = (unsigned char *)dd->port->log_buf;
 575                 if (buf[259] & 0x1) {
 576                         dev_info(&dd->pdev->dev,
 577                                 "Write protect bit is set.\n");
 578                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 579                         fail_all_ncq_write = 1;
 580                         fail_reason = "write protect";
 581                 }
 582                 if (buf[288] == 0xF7) {
 583                         dev_info(&dd->pdev->dev,
 584                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 585                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 586                         fail_all_ncq_cmds = 1;
 587                         fail_reason = "thermal shutdown";
 588                 }
 589                 if (buf[288] == 0xBF) {
 590                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
 591                         dev_info(&dd->pdev->dev,
 592                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 593                         fail_all_ncq_cmds = 1;
 594                         fail_reason = "rebuild failed";
 595                 }
 596         }
 597 
 598         /* clear the tag accumulator */
 599         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 600 
 601         /* Loop through all the groups */
 602         for (group = 0; group < dd->slot_groups; group++) {
 603                 for (bit = 0; bit < 32; bit++) {
 604                         reissue = 1;
 605                         tag = (group << 5) + bit;
 606                         cmd = mtip_cmd_from_tag(dd, tag);
 607 
 608                         fis = (struct host_to_dev_fis *)cmd->command;
 609 
 610                         /* Should re-issue? */
 611                         if (tag == MTIP_TAG_INTERNAL ||
 612                             fis->command == ATA_CMD_SET_FEATURES)
 613                                 reissue = 0;
 614                         else {
 615                                 if (fail_all_ncq_cmds ||
 616                                         (fail_all_ncq_write &&
 617                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 618                                         dev_warn(&dd->pdev->dev,
 619                                         "  Fail: %s w/tag %d [%s].\n",
 620                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 621                                                 "write" : "read",
 622                                         tag,
 623                                         fail_reason != NULL ?
 624                                                 fail_reason : "unknown");
 625                                         mtip_complete_command(cmd, BLK_STS_MEDIUM);
 626                                         continue;
 627                                 }
 628                         }
 629 
 630                         /*
 631                          * First check if this command has
 632                          *  exceeded its retries.
 633                          */
 634                         if (reissue && (cmd->retries-- > 0)) {
 635 
 636                                 set_bit(tag, tagaccum);
 637 
 638                                 /* Re-issue the command. */
 639                                 mtip_issue_ncq_command(port, tag);
 640 
 641                                 continue;
 642                         }
 643 
 644                         /* Retire a command that will not be reissued */
 645                         dev_warn(&port->dd->pdev->dev,
 646                                 "retiring tag %d\n", tag);
 647 
 648                         mtip_complete_command(cmd, BLK_STS_IOERR);
 649                 }
 650         }
 651         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 652 }
 653 
 654 /*
 655  * Handle a set device bits interrupt
 656  */
 657 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 658                                                         u32 completed)
 659 {
 660         struct driver_data *dd = port->dd;
 661         int tag, bit;
 662         struct mtip_cmd *command;
 663 
 664         if (!completed) {
 665                 WARN_ON_ONCE(!completed);
 666                 return;
 667         }
 668         /* clear completed status register in the hardware.*/
 669         writel(completed, port->completed[group]);
 670 
 671         /* Process completed commands. */
 672         for (bit = 0; (bit < 32) && completed; bit++) {
 673                 if (completed & 0x01) {
 674                         tag = (group << 5) | bit;
 675 
 676                         /* skip internal command slot. */
 677                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 678                                 continue;
 679 
 680                         command = mtip_cmd_from_tag(dd, tag);
 681                         mtip_complete_command(command, 0);
 682                 }
 683                 completed >>= 1;
 684         }
 685 
 686         /* If last, re-enable interrupts */
 687         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 688                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 689 }
 690 
 691 /*
 692  * Process legacy pio and d2h interrupts
 693  */
 694 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 695 {
 696         struct mtip_port *port = dd->port;
 697         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 698 
 699         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) && cmd) {
 700                 int group = MTIP_TAG_INDEX(MTIP_TAG_INTERNAL);
 701                 int status = readl(port->cmd_issue[group]);
 702 
 703                 if (!(status & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))))
 704                         mtip_complete_command(cmd, 0);
 705         }
 706 }
 707 
 708 /*
 709  * Demux and handle errors
 710  */
 711 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 712 {
 713         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 714                 dev_warn(&dd->pdev->dev,
 715                         "Clearing PxSERR.DIAG.x\n");
 716                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 717         }
 718 
 719         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 720                 dev_warn(&dd->pdev->dev,
 721                         "Clearing PxSERR.DIAG.n\n");
 722                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 723         }
 724 
 725         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 726                 dev_warn(&dd->pdev->dev,
 727                         "Port stat errors %x unhandled\n",
 728                         (port_stat & ~PORT_IRQ_HANDLED));
 729                 if (mtip_check_surprise_removal(dd->pdev))
 730                         return;
 731         }
 732         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 733                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 734                 wake_up_interruptible(&dd->port->svc_wait);
 735         }
 736 }
 737 
 738 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 739 {
 740         struct driver_data *dd = (struct driver_data *) data;
 741         struct mtip_port *port = dd->port;
 742         u32 hba_stat, port_stat;
 743         int rv = IRQ_NONE;
 744         int do_irq_enable = 1, i, workers;
 745         struct mtip_work *twork;
 746 
 747         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 748         if (hba_stat) {
 749                 rv = IRQ_HANDLED;
 750 
 751                 /* Acknowledge the interrupt status on the port.*/
 752                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 753                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 754                         mtip_check_surprise_removal(dd->pdev);
 755                         return IRQ_HANDLED;
 756                 }
 757                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 758 
 759                 /* Demux port status */
 760                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 761                         do_irq_enable = 0;
 762                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 763 
 764                         /* Start at 1: group zero is always local? */
 765                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 766                                                                         i++) {
 767                                 twork = &dd->work[i];
 768                                 twork->completed = readl(port->completed[i]);
 769                                 if (twork->completed)
 770                                         workers++;
 771                         }
 772 
 773                         atomic_set(&dd->irq_workers_active, workers);
 774                         if (workers) {
 775                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 776                                         twork = &dd->work[i];
 777                                         if (twork->completed)
 778                                                 queue_work_on(
 779                                                         twork->cpu_binding,
 780                                                         dd->isr_workq,
 781                                                         &twork->work);
 782                                 }
 783 
 784                                 if (likely(dd->work[0].completed))
 785                                         mtip_workq_sdbfx(port, 0,
 786                                                         dd->work[0].completed);
 787 
 788                         } else {
 789                                 /*
 790                                  * Chip quirk: SDB interrupt but nothing
 791                                  * to complete
 792                                  */
 793                                 do_irq_enable = 1;
 794                         }
 795                 }
 796 
 797                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 798                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
 799                                 /* don't proceed further */
 800                                 return IRQ_HANDLED;
 801                         }
 802                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 803                                                         &dd->dd_flag))
 804                                 return rv;
 805 
 806                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 807                 }
 808 
 809                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 810                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 811         }
 812 
 813         /* acknowledge interrupt */
 814         if (unlikely(do_irq_enable))
 815                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 816 
 817         return rv;
 818 }
 819 
 820 /*
 821  * HBA interrupt subroutine.
 822  *
 823  * @irq         IRQ number.
 824  * @instance    Pointer to the driver data structure.
 825  *
 826  * return value
 827  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 828  *      IRQ_NONE        This interrupt was not for the HBA.
 829  */
 830 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 831 {
 832         struct driver_data *dd = instance;
 833 
 834         return mtip_handle_irq(dd);
 835 }
 836 
 837 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 838 {
 839         writel(1 << MTIP_TAG_BIT(tag), port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 840 }
 841 
 842 static bool mtip_pause_ncq(struct mtip_port *port,
 843                                 struct host_to_dev_fis *fis)
 844 {
 845         unsigned long task_file_data;
 846 
 847         task_file_data = readl(port->mmio+PORT_TFDATA);
 848         if ((task_file_data & 1))
 849                 return false;
 850 
 851         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 852                 port->ic_pause_timer = jiffies;
 853                 return true;
 854         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
 855                                         (fis->features == 0x03)) {
 856                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 857                 port->ic_pause_timer = jiffies;
 858                 return true;
 859         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
 860                 ((fis->command == 0xFC) &&
 861                         (fis->features == 0x27 || fis->features == 0x72 ||
 862                          fis->features == 0x62 || fis->features == 0x26))) {
 863                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
 864                 clear_bit(MTIP_DDF_REBUILD_FAILED_BIT, &port->dd->dd_flag);
 865                 /* Com reset after secure erase or lowlevel format */
 866                 mtip_restart_port(port);
 867                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 868                 return false;
 869         }
 870 
 871         return false;
 872 }
 873 
 874 static bool mtip_commands_active(struct mtip_port *port)
 875 {
 876         unsigned int active;
 877         unsigned int n;
 878 
 879         /*
 880          * Ignore s_active bit 0 of array element 0.
 881          * This bit will always be set
 882          */
 883         active = readl(port->s_active[0]) & 0xFFFFFFFE;
 884         for (n = 1; n < port->dd->slot_groups; n++)
 885                 active |= readl(port->s_active[n]);
 886 
 887         return active != 0;
 888 }
 889 
 890 /*
 891  * Wait for port to quiesce
 892  *
 893  * @port    Pointer to port data structure
 894  * @timeout Max duration to wait (ms)
 895  *
 896  * return value
 897  *      0       Success
 898  *      -EBUSY  Commands still active
 899  */
 900 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 901 {
 902         unsigned long to;
 903         bool active = true;
 904 
 905         blk_mq_quiesce_queue(port->dd->queue);
 906 
 907         to = jiffies + msecs_to_jiffies(timeout);
 908         do {
 909                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
 910                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
 911                         msleep(20);
 912                         continue; /* svc thd is actively issuing commands */
 913                 }
 914 
 915                 msleep(100);
 916 
 917                 if (mtip_check_surprise_removal(port->dd->pdev))
 918                         goto err_fault;
 919 
 920                 active = mtip_commands_active(port);
 921                 if (!active)
 922                         break;
 923         } while (time_before(jiffies, to));
 924 
 925         blk_mq_unquiesce_queue(port->dd->queue);
 926         return active ? -EBUSY : 0;
 927 err_fault:
 928         blk_mq_unquiesce_queue(port->dd->queue);
 929         return -EFAULT;
 930 }
 931 
 932 struct mtip_int_cmd {
 933         int fis_len;
 934         dma_addr_t buffer;
 935         int buf_len;
 936         u32 opts;
 937 };
 938 
 939 /*
 940  * Execute an internal command and wait for the completion.
 941  *
 942  * @port    Pointer to the port data structure.
 943  * @fis     Pointer to the FIS that describes the command.
 944  * @fis_len  Length in WORDS of the FIS.
 945  * @buffer  DMA accessible for command data.
 946  * @buf_len  Length, in bytes, of the data buffer.
 947  * @opts    Command header options, excluding the FIS length
 948  *             and the number of PRD entries.
 949  * @timeout Time in ms to wait for the command to complete.
 950  *
 951  * return value
 952  *      0        Command completed successfully.
 953  *      -EFAULT  The buffer address is not correctly aligned.
 954  *      -EBUSY   Internal command or other IO in progress.
 955  *      -EAGAIN  Time out waiting for command to complete.
 956  */
 957 static int mtip_exec_internal_command(struct mtip_port *port,
 958                                         struct host_to_dev_fis *fis,
 959                                         int fis_len,
 960                                         dma_addr_t buffer,
 961                                         int buf_len,
 962                                         u32 opts,
 963                                         unsigned long timeout)
 964 {
 965         struct mtip_cmd *int_cmd;
 966         struct driver_data *dd = port->dd;
 967         struct request *rq;
 968         struct mtip_int_cmd icmd = {
 969                 .fis_len = fis_len,
 970                 .buffer = buffer,
 971                 .buf_len = buf_len,
 972                 .opts = opts
 973         };
 974         int rv = 0;
 975 
 976         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
 977         if (buffer & 0x00000007) {
 978                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
 979                 return -EFAULT;
 980         }
 981 
 982         if (mtip_check_surprise_removal(dd->pdev))
 983                 return -EFAULT;
 984 
 985         rq = blk_mq_alloc_request(dd->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_RESERVED);
 986         if (IS_ERR(rq)) {
 987                 dbg_printk(MTIP_DRV_NAME "Unable to allocate tag for PIO cmd\n");
 988                 return -EFAULT;
 989         }
 990 
 991         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
 992 
 993         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
 994                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 995 
 996         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 997 
 998         if (fis->command != ATA_CMD_STANDBYNOW1) {
 999                 /* wait for io to complete if non atomic */
1000                 if (mtip_quiesce_io(port, MTIP_QUIESCE_IO_TIMEOUT_MS) < 0) {
1001                         dev_warn(&dd->pdev->dev, "Failed to quiesce IO\n");
1002                         blk_mq_free_request(rq);
1003                         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1004                         wake_up_interruptible(&port->svc_wait);
1005                         return -EBUSY;
1006                 }
1007         }
1008 
1009         /* Copy the command to the command table */
1010         int_cmd = blk_mq_rq_to_pdu(rq);
1011         int_cmd->icmd = &icmd;
1012         memcpy(int_cmd->command, fis, fis_len*4);
1013 
1014         rq->timeout = timeout;
1015 
1016         /* insert request and run queue */
1017         blk_execute_rq(rq->q, NULL, rq, true);
1018 
1019         if (int_cmd->status) {
1020                 dev_err(&dd->pdev->dev, "Internal command [%02X] failed %d\n",
1021                                 fis->command, int_cmd->status);
1022                 rv = -EIO;
1023 
1024                 if (mtip_check_surprise_removal(dd->pdev) ||
1025                         test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1026                                         &dd->dd_flag)) {
1027                         dev_err(&dd->pdev->dev,
1028                                 "Internal command [%02X] wait returned due to SR\n",
1029                                 fis->command);
1030                         rv = -ENXIO;
1031                         goto exec_ic_exit;
1032                 }
1033                 mtip_device_reset(dd); /* recover from timeout issue */
1034                 rv = -EAGAIN;
1035                 goto exec_ic_exit;
1036         }
1037 
1038         if (readl(port->cmd_issue[MTIP_TAG_INDEX(MTIP_TAG_INTERNAL)])
1039                         & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))) {
1040                 rv = -ENXIO;
1041                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1042                         mtip_device_reset(dd);
1043                         rv = -EAGAIN;
1044                 }
1045         }
1046 exec_ic_exit:
1047         /* Clear the allocated and active bits for the internal command. */
1048         blk_mq_free_request(rq);
1049         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1050         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1051                 /* NCQ paused */
1052                 return rv;
1053         }
1054         wake_up_interruptible(&port->svc_wait);
1055 
1056         return rv;
1057 }
1058 
1059 /*
1060  * Byte-swap ATA ID strings.
1061  *
1062  * ATA identify data contains strings in byte-swapped 16-bit words.
1063  * They must be swapped (on all architectures) to be usable as C strings.
1064  * This function swaps bytes in-place.
1065  *
1066  * @buf The buffer location of the string
1067  * @len The number of bytes to swap
1068  *
1069  * return value
1070  *      None
1071  */
1072 static inline void ata_swap_string(u16 *buf, unsigned int len)
1073 {
1074         int i;
1075         for (i = 0; i < (len/2); i++)
1076                 be16_to_cpus(&buf[i]);
1077 }
1078 
1079 static void mtip_set_timeout(struct driver_data *dd,
1080                                         struct host_to_dev_fis *fis,
1081                                         unsigned int *timeout, u8 erasemode)
1082 {
1083         switch (fis->command) {
1084         case ATA_CMD_DOWNLOAD_MICRO:
1085                 *timeout = 120000; /* 2 minutes */
1086                 break;
1087         case ATA_CMD_SEC_ERASE_UNIT:
1088         case 0xFC:
1089                 if (erasemode)
1090                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1091                 else
1092                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1093                 break;
1094         case ATA_CMD_STANDBYNOW1:
1095                 *timeout = 120000;  /* 2 minutes */
1096                 break;
1097         case 0xF7:
1098         case 0xFA:
1099                 *timeout = 60000;  /* 60 seconds */
1100                 break;
1101         case ATA_CMD_SMART:
1102                 *timeout = 15000;  /* 15 seconds */
1103                 break;
1104         default:
1105                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1106                 break;
1107         }
1108 }
1109 
1110 /*
1111  * Request the device identity information.
1112  *
1113  * If a user space buffer is not specified, i.e. is NULL, the
1114  * identify information is still read from the drive and placed
1115  * into the identify data buffer (@e port->identify) in the
1116  * port data structure.
1117  * When the identify buffer contains valid identify information @e
1118  * port->identify_valid is non-zero.
1119  *
1120  * @port         Pointer to the port structure.
1121  * @user_buffer  A user space buffer where the identify data should be
1122  *                    copied.
1123  *
1124  * return value
1125  *      0       Command completed successfully.
1126  *      -EFAULT An error occurred while coping data to the user buffer.
1127  *      -1      Command failed.
1128  */
1129 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1130 {
1131         int rv = 0;
1132         struct host_to_dev_fis fis;
1133 
1134         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1135                 return -EFAULT;
1136 
1137         /* Build the FIS. */
1138         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1139         fis.type        = 0x27;
1140         fis.opts        = 1 << 7;
1141         fis.command     = ATA_CMD_ID_ATA;
1142 
1143         /* Set the identify information as invalid. */
1144         port->identify_valid = 0;
1145 
1146         /* Clear the identify information. */
1147         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1148 
1149         /* Execute the command. */
1150         if (mtip_exec_internal_command(port,
1151                                 &fis,
1152                                 5,
1153                                 port->identify_dma,
1154                                 sizeof(u16) * ATA_ID_WORDS,
1155                                 0,
1156                                 MTIP_INT_CMD_TIMEOUT_MS)
1157                                 < 0) {
1158                 rv = -1;
1159                 goto out;
1160         }
1161 
1162         /*
1163          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1164          * perform field-sensitive swapping on the string fields.
1165          * See the kernel use of ata_id_string() for proof of this.
1166          */
1167 #ifdef __LITTLE_ENDIAN
1168         ata_swap_string(port->identify + 27, 40);  /* model string*/
1169         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1170         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1171 #else
1172         {
1173                 int i;
1174                 for (i = 0; i < ATA_ID_WORDS; i++)
1175                         port->identify[i] = le16_to_cpu(port->identify[i]);
1176         }
1177 #endif
1178 
1179         /* Check security locked state */
1180         if (port->identify[128] & 0x4)
1181                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1182         else
1183                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1184 
1185         /* Set the identify buffer as valid. */
1186         port->identify_valid = 1;
1187 
1188         if (user_buffer) {
1189                 if (copy_to_user(
1190                         user_buffer,
1191                         port->identify,
1192                         ATA_ID_WORDS * sizeof(u16))) {
1193                         rv = -EFAULT;
1194                         goto out;
1195                 }
1196         }
1197 
1198 out:
1199         return rv;
1200 }
1201 
1202 /*
1203  * Issue a standby immediate command to the device.
1204  *
1205  * @port Pointer to the port structure.
1206  *
1207  * return value
1208  *      0       Command was executed successfully.
1209  *      -1      An error occurred while executing the command.
1210  */
1211 static int mtip_standby_immediate(struct mtip_port *port)
1212 {
1213         int rv;
1214         struct host_to_dev_fis  fis;
1215         unsigned long start;
1216         unsigned int timeout;
1217 
1218         /* Build the FIS. */
1219         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1220         fis.type        = 0x27;
1221         fis.opts        = 1 << 7;
1222         fis.command     = ATA_CMD_STANDBYNOW1;
1223 
1224         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1225 
1226         start = jiffies;
1227         rv = mtip_exec_internal_command(port,
1228                                         &fis,
1229                                         5,
1230                                         0,
1231                                         0,
1232                                         0,
1233                                         timeout);
1234         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1235                         jiffies_to_msecs(jiffies - start));
1236         if (rv)
1237                 dev_warn(&port->dd->pdev->dev,
1238                         "STANDBY IMMEDIATE command failed.\n");
1239 
1240         return rv;
1241 }
1242 
1243 /*
1244  * Issue a READ LOG EXT command to the device.
1245  *
1246  * @port        pointer to the port structure.
1247  * @page        page number to fetch
1248  * @buffer      pointer to buffer
1249  * @buffer_dma  dma address corresponding to @buffer
1250  * @sectors     page length to fetch, in sectors
1251  *
1252  * return value
1253  *      @rv     return value from mtip_exec_internal_command()
1254  */
1255 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1256                                 dma_addr_t buffer_dma, unsigned int sectors)
1257 {
1258         struct host_to_dev_fis fis;
1259 
1260         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1261         fis.type        = 0x27;
1262         fis.opts        = 1 << 7;
1263         fis.command     = ATA_CMD_READ_LOG_EXT;
1264         fis.sect_count  = sectors & 0xFF;
1265         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1266         fis.lba_low     = page;
1267         fis.lba_mid     = 0;
1268         fis.device      = ATA_DEVICE_OBS;
1269 
1270         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1271 
1272         return mtip_exec_internal_command(port,
1273                                         &fis,
1274                                         5,
1275                                         buffer_dma,
1276                                         sectors * ATA_SECT_SIZE,
1277                                         0,
1278                                         MTIP_INT_CMD_TIMEOUT_MS);
1279 }
1280 
1281 /*
1282  * Issue a SMART READ DATA command to the device.
1283  *
1284  * @port        pointer to the port structure.
1285  * @buffer      pointer to buffer
1286  * @buffer_dma  dma address corresponding to @buffer
1287  *
1288  * return value
1289  *      @rv     return value from mtip_exec_internal_command()
1290  */
1291 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1292                                         dma_addr_t buffer_dma)
1293 {
1294         struct host_to_dev_fis fis;
1295 
1296         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1297         fis.type        = 0x27;
1298         fis.opts        = 1 << 7;
1299         fis.command     = ATA_CMD_SMART;
1300         fis.features    = 0xD0;
1301         fis.sect_count  = 1;
1302         fis.lba_mid     = 0x4F;
1303         fis.lba_hi      = 0xC2;
1304         fis.device      = ATA_DEVICE_OBS;
1305 
1306         return mtip_exec_internal_command(port,
1307                                         &fis,
1308                                         5,
1309                                         buffer_dma,
1310                                         ATA_SECT_SIZE,
1311                                         0,
1312                                         15000);
1313 }
1314 
1315 /*
1316  * Get the value of a smart attribute
1317  *
1318  * @port        pointer to the port structure
1319  * @id          attribute number
1320  * @attrib      pointer to return attrib information corresponding to @id
1321  *
1322  * return value
1323  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1324  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1325  */
1326 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1327                                                 struct smart_attr *attrib)
1328 {
1329         int rv, i;
1330         struct smart_attr *pattr;
1331 
1332         if (!attrib)
1333                 return -EINVAL;
1334 
1335         if (!port->identify_valid) {
1336                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1337                 return -EPERM;
1338         }
1339         if (!(port->identify[82] & 0x1)) {
1340                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1341                 return -EPERM;
1342         }
1343         if (!(port->identify[85] & 0x1)) {
1344                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1345                 return -EPERM;
1346         }
1347 
1348         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1349         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1350         if (rv) {
1351                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1352                 return rv;
1353         }
1354 
1355         pattr = (struct smart_attr *)(port->smart_buf + 2);
1356         for (i = 0; i < 29; i++, pattr++)
1357                 if (pattr->attr_id == id) {
1358                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1359                         break;
1360                 }
1361 
1362         if (i == 29) {
1363                 dev_warn(&port->dd->pdev->dev,
1364                         "Query for invalid SMART attribute ID\n");
1365                 rv = -EINVAL;
1366         }
1367 
1368         return rv;
1369 }
1370 
1371 /*
1372  * Get the drive capacity.
1373  *
1374  * @dd      Pointer to the device data structure.
1375  * @sectors Pointer to the variable that will receive the sector count.
1376  *
1377  * return value
1378  *      1 Capacity was returned successfully.
1379  *      0 The identify information is invalid.
1380  */
1381 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1382 {
1383         struct mtip_port *port = dd->port;
1384         u64 total, raw0, raw1, raw2, raw3;
1385         raw0 = port->identify[100];
1386         raw1 = port->identify[101];
1387         raw2 = port->identify[102];
1388         raw3 = port->identify[103];
1389         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1390         *sectors = total;
1391         return (bool) !!port->identify_valid;
1392 }
1393 
1394 /*
1395  * Display the identify command data.
1396  *
1397  * @port Pointer to the port data structure.
1398  *
1399  * return value
1400  *      None
1401  */
1402 static void mtip_dump_identify(struct mtip_port *port)
1403 {
1404         sector_t sectors;
1405         unsigned short revid;
1406         char cbuf[42];
1407 
1408         if (!port->identify_valid)
1409                 return;
1410 
1411         strlcpy(cbuf, (char *)(port->identify+10), 21);
1412         dev_info(&port->dd->pdev->dev,
1413                 "Serial No.: %s\n", cbuf);
1414 
1415         strlcpy(cbuf, (char *)(port->identify+23), 9);
1416         dev_info(&port->dd->pdev->dev,
1417                 "Firmware Ver.: %s\n", cbuf);
1418 
1419         strlcpy(cbuf, (char *)(port->identify+27), 41);
1420         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1421 
1422         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1423                 port->identify[128],
1424                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1425 
1426         if (mtip_hw_get_capacity(port->dd, &sectors))
1427                 dev_info(&port->dd->pdev->dev,
1428                         "Capacity: %llu sectors (%llu MB)\n",
1429                          (u64)sectors,
1430                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1431 
1432         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1433         switch (revid & 0xFF) {
1434         case 0x1:
1435                 strlcpy(cbuf, "A0", 3);
1436                 break;
1437         case 0x3:
1438                 strlcpy(cbuf, "A2", 3);
1439                 break;
1440         default:
1441                 strlcpy(cbuf, "?", 2);
1442                 break;
1443         }
1444         dev_info(&port->dd->pdev->dev,
1445                 "Card Type: %s\n", cbuf);
1446 }
1447 
1448 /*
1449  * Map the commands scatter list into the command table.
1450  *
1451  * @command Pointer to the command.
1452  * @nents Number of scatter list entries.
1453  *
1454  * return value
1455  *      None
1456  */
1457 static inline void fill_command_sg(struct driver_data *dd,
1458                                 struct mtip_cmd *command,
1459                                 int nents)
1460 {
1461         int n;
1462         unsigned int dma_len;
1463         struct mtip_cmd_sg *command_sg;
1464         struct scatterlist *sg;
1465 
1466         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1467 
1468         for_each_sg(command->sg, sg, nents, n) {
1469                 dma_len = sg_dma_len(sg);
1470                 if (dma_len > 0x400000)
1471                         dev_err(&dd->pdev->dev,
1472                                 "DMA segment length truncated\n");
1473                 command_sg->info = cpu_to_le32((dma_len-1) & 0x3FFFFF);
1474                 command_sg->dba =  cpu_to_le32(sg_dma_address(sg));
1475                 command_sg->dba_upper =
1476                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1477                 command_sg++;
1478         }
1479 }
1480 
1481 /*
1482  * @brief Execute a drive command.
1483  *
1484  * return value 0 The command completed successfully.
1485  * return value -1 An error occurred while executing the command.
1486  */
1487 static int exec_drive_task(struct mtip_port *port, u8 *command)
1488 {
1489         struct host_to_dev_fis  fis;
1490         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1491         unsigned int to;
1492 
1493         /* Build the FIS. */
1494         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1495         fis.type        = 0x27;
1496         fis.opts        = 1 << 7;
1497         fis.command     = command[0];
1498         fis.features    = command[1];
1499         fis.sect_count  = command[2];
1500         fis.sector      = command[3];
1501         fis.cyl_low     = command[4];
1502         fis.cyl_hi      = command[5];
1503         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1504 
1505         mtip_set_timeout(port->dd, &fis, &to, 0);
1506 
1507         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1508                 __func__,
1509                 command[0],
1510                 command[1],
1511                 command[2],
1512                 command[3],
1513                 command[4],
1514                 command[5],
1515                 command[6]);
1516 
1517         /* Execute the command. */
1518         if (mtip_exec_internal_command(port,
1519                                  &fis,
1520                                  5,
1521                                  0,
1522                                  0,
1523                                  0,
1524                                  to) < 0) {
1525                 return -1;
1526         }
1527 
1528         command[0] = reply->command; /* Status*/
1529         command[1] = reply->features; /* Error*/
1530         command[4] = reply->cyl_low;
1531         command[5] = reply->cyl_hi;
1532 
1533         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1534                 __func__,
1535                 command[0],
1536                 command[1],
1537                 command[4],
1538                 command[5]);
1539 
1540         return 0;
1541 }
1542 
1543 /*
1544  * @brief Execute a drive command.
1545  *
1546  * @param port Pointer to the port data structure.
1547  * @param command Pointer to the user specified command parameters.
1548  * @param user_buffer Pointer to the user space buffer where read sector
1549  *                   data should be copied.
1550  *
1551  * return value 0 The command completed successfully.
1552  * return value -EFAULT An error occurred while copying the completion
1553  *                 data to the user space buffer.
1554  * return value -1 An error occurred while executing the command.
1555  */
1556 static int exec_drive_command(struct mtip_port *port, u8 *command,
1557                                 void __user *user_buffer)
1558 {
1559         struct host_to_dev_fis  fis;
1560         struct host_to_dev_fis *reply;
1561         u8 *buf = NULL;
1562         dma_addr_t dma_addr = 0;
1563         int rv = 0, xfer_sz = command[3];
1564         unsigned int to;
1565 
1566         if (xfer_sz) {
1567                 if (!user_buffer)
1568                         return -EFAULT;
1569 
1570                 buf = dma_alloc_coherent(&port->dd->pdev->dev,
1571                                 ATA_SECT_SIZE * xfer_sz,
1572                                 &dma_addr,
1573                                 GFP_KERNEL);
1574                 if (!buf) {
1575                         dev_err(&port->dd->pdev->dev,
1576                                 "Memory allocation failed (%d bytes)\n",
1577                                 ATA_SECT_SIZE * xfer_sz);
1578                         return -ENOMEM;
1579                 }
1580         }
1581 
1582         /* Build the FIS. */
1583         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1584         fis.type        = 0x27;
1585         fis.opts        = 1 << 7;
1586         fis.command     = command[0];
1587         fis.features    = command[2];
1588         fis.sect_count  = command[3];
1589         if (fis.command == ATA_CMD_SMART) {
1590                 fis.sector      = command[1];
1591                 fis.cyl_low     = 0x4F;
1592                 fis.cyl_hi      = 0xC2;
1593         }
1594 
1595         mtip_set_timeout(port->dd, &fis, &to, 0);
1596 
1597         if (xfer_sz)
1598                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1599         else
1600                 reply = (port->rxfis + RX_FIS_D2H_REG);
1601 
1602         dbg_printk(MTIP_DRV_NAME
1603                 " %s: User Command: cmd %x, sect %x, "
1604                 "feat %x, sectcnt %x\n",
1605                 __func__,
1606                 command[0],
1607                 command[1],
1608                 command[2],
1609                 command[3]);
1610 
1611         /* Execute the command. */
1612         if (mtip_exec_internal_command(port,
1613                                 &fis,
1614                                  5,
1615                                  (xfer_sz ? dma_addr : 0),
1616                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1617                                  0,
1618                                  to)
1619                                  < 0) {
1620                 rv = -EFAULT;
1621                 goto exit_drive_command;
1622         }
1623 
1624         /* Collect the completion status. */
1625         command[0] = reply->command; /* Status*/
1626         command[1] = reply->features; /* Error*/
1627         command[2] = reply->sect_count;
1628 
1629         dbg_printk(MTIP_DRV_NAME
1630                 " %s: Completion Status: stat %x, "
1631                 "err %x, nsect %x\n",
1632                 __func__,
1633                 command[0],
1634                 command[1],
1635                 command[2]);
1636 
1637         if (xfer_sz) {
1638                 if (copy_to_user(user_buffer,
1639                                  buf,
1640                                  ATA_SECT_SIZE * command[3])) {
1641                         rv = -EFAULT;
1642                         goto exit_drive_command;
1643                 }
1644         }
1645 exit_drive_command:
1646         if (buf)
1647                 dma_free_coherent(&port->dd->pdev->dev,
1648                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1649         return rv;
1650 }
1651 
1652 /*
1653  *  Indicates whether a command has a single sector payload.
1654  *
1655  *  @command passed to the device to perform the certain event.
1656  *  @features passed to the device to perform the certain event.
1657  *
1658  *  return value
1659  *      1       command is one that always has a single sector payload,
1660  *              regardless of the value in the Sector Count field.
1661  *      0       otherwise
1662  *
1663  */
1664 static unsigned int implicit_sector(unsigned char command,
1665                                     unsigned char features)
1666 {
1667         unsigned int rv = 0;
1668 
1669         /* list of commands that have an implicit sector count of 1 */
1670         switch (command) {
1671         case ATA_CMD_SEC_SET_PASS:
1672         case ATA_CMD_SEC_UNLOCK:
1673         case ATA_CMD_SEC_ERASE_PREP:
1674         case ATA_CMD_SEC_ERASE_UNIT:
1675         case ATA_CMD_SEC_FREEZE_LOCK:
1676         case ATA_CMD_SEC_DISABLE_PASS:
1677         case ATA_CMD_PMP_READ:
1678         case ATA_CMD_PMP_WRITE:
1679                 rv = 1;
1680                 break;
1681         case ATA_CMD_SET_MAX:
1682                 if (features == ATA_SET_MAX_UNLOCK)
1683                         rv = 1;
1684                 break;
1685         case ATA_CMD_SMART:
1686                 if ((features == ATA_SMART_READ_VALUES) ||
1687                                 (features == ATA_SMART_READ_THRESHOLDS))
1688                         rv = 1;
1689                 break;
1690         case ATA_CMD_CONF_OVERLAY:
1691                 if ((features == ATA_DCO_IDENTIFY) ||
1692                                 (features == ATA_DCO_SET))
1693                         rv = 1;
1694                 break;
1695         }
1696         return rv;
1697 }
1698 
1699 /*
1700  * Executes a taskfile
1701  * See ide_taskfile_ioctl() for derivation
1702  */
1703 static int exec_drive_taskfile(struct driver_data *dd,
1704                                void __user *buf,
1705                                ide_task_request_t *req_task,
1706                                int outtotal)
1707 {
1708         struct host_to_dev_fis  fis;
1709         struct host_to_dev_fis *reply;
1710         u8 *outbuf = NULL;
1711         u8 *inbuf = NULL;
1712         dma_addr_t outbuf_dma = 0;
1713         dma_addr_t inbuf_dma = 0;
1714         dma_addr_t dma_buffer = 0;
1715         int err = 0;
1716         unsigned int taskin = 0;
1717         unsigned int taskout = 0;
1718         u8 nsect = 0;
1719         unsigned int timeout;
1720         unsigned int force_single_sector;
1721         unsigned int transfer_size;
1722         unsigned long task_file_data;
1723         int intotal = outtotal + req_task->out_size;
1724         int erasemode = 0;
1725 
1726         taskout = req_task->out_size;
1727         taskin = req_task->in_size;
1728         /* 130560 = 512 * 0xFF*/
1729         if (taskin > 130560 || taskout > 130560)
1730                 return -EINVAL;
1731 
1732         if (taskout) {
1733                 outbuf = memdup_user(buf + outtotal, taskout);
1734                 if (IS_ERR(outbuf))
1735                         return PTR_ERR(outbuf);
1736 
1737                 outbuf_dma = dma_map_single(&dd->pdev->dev, outbuf,
1738                                             taskout, DMA_TO_DEVICE);
1739                 if (dma_mapping_error(&dd->pdev->dev, outbuf_dma)) {
1740                         err = -ENOMEM;
1741                         goto abort;
1742                 }
1743                 dma_buffer = outbuf_dma;
1744         }
1745 
1746         if (taskin) {
1747                 inbuf = memdup_user(buf + intotal, taskin);
1748                 if (IS_ERR(inbuf)) {
1749                         err = PTR_ERR(inbuf);
1750                         inbuf = NULL;
1751                         goto abort;
1752                 }
1753                 inbuf_dma = dma_map_single(&dd->pdev->dev, inbuf,
1754                                            taskin, DMA_FROM_DEVICE);
1755                 if (dma_mapping_error(&dd->pdev->dev, inbuf_dma)) {
1756                         err = -ENOMEM;
1757                         goto abort;
1758                 }
1759                 dma_buffer = inbuf_dma;
1760         }
1761 
1762         /* only supports PIO and non-data commands from this ioctl. */
1763         switch (req_task->data_phase) {
1764         case TASKFILE_OUT:
1765                 nsect = taskout / ATA_SECT_SIZE;
1766                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1767                 break;
1768         case TASKFILE_IN:
1769                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1770                 break;
1771         case TASKFILE_NO_DATA:
1772                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
1773                 break;
1774         default:
1775                 err = -EINVAL;
1776                 goto abort;
1777         }
1778 
1779         /* Build the FIS. */
1780         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1781 
1782         fis.type        = 0x27;
1783         fis.opts        = 1 << 7;
1784         fis.command     = req_task->io_ports[7];
1785         fis.features    = req_task->io_ports[1];
1786         fis.sect_count  = req_task->io_ports[2];
1787         fis.lba_low     = req_task->io_ports[3];
1788         fis.lba_mid     = req_task->io_ports[4];
1789         fis.lba_hi      = req_task->io_ports[5];
1790          /* Clear the dev bit*/
1791         fis.device      = req_task->io_ports[6] & ~0x10;
1792 
1793         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
1794                 req_task->in_flags.all  =
1795                         IDE_TASKFILE_STD_IN_FLAGS |
1796                         (IDE_HOB_STD_IN_FLAGS << 8);
1797                 fis.lba_low_ex          = req_task->hob_ports[3];
1798                 fis.lba_mid_ex          = req_task->hob_ports[4];
1799                 fis.lba_hi_ex           = req_task->hob_ports[5];
1800                 fis.features_ex         = req_task->hob_ports[1];
1801                 fis.sect_cnt_ex         = req_task->hob_ports[2];
1802 
1803         } else {
1804                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
1805         }
1806 
1807         force_single_sector = implicit_sector(fis.command, fis.features);
1808 
1809         if ((taskin || taskout) && (!fis.sect_count)) {
1810                 if (nsect)
1811                         fis.sect_count = nsect;
1812                 else {
1813                         if (!force_single_sector) {
1814                                 dev_warn(&dd->pdev->dev,
1815                                         "data movement but "
1816                                         "sect_count is 0\n");
1817                                 err = -EINVAL;
1818                                 goto abort;
1819                         }
1820                 }
1821         }
1822 
1823         dbg_printk(MTIP_DRV_NAME
1824                 " %s: cmd %x, feat %x, nsect %x,"
1825                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1826                 " head/dev %x\n",
1827                 __func__,
1828                 fis.command,
1829                 fis.features,
1830                 fis.sect_count,
1831                 fis.lba_low,
1832                 fis.lba_mid,
1833                 fis.lba_hi,
1834                 fis.device);
1835 
1836         /* check for erase mode support during secure erase.*/
1837         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
1838                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
1839                 erasemode = 1;
1840         }
1841 
1842         mtip_set_timeout(dd, &fis, &timeout, erasemode);
1843 
1844         /* Determine the correct transfer size.*/
1845         if (force_single_sector)
1846                 transfer_size = ATA_SECT_SIZE;
1847         else
1848                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
1849 
1850         /* Execute the command.*/
1851         if (mtip_exec_internal_command(dd->port,
1852                                  &fis,
1853                                  5,
1854                                  dma_buffer,
1855                                  transfer_size,
1856                                  0,
1857                                  timeout) < 0) {
1858                 err = -EIO;
1859                 goto abort;
1860         }
1861 
1862         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
1863 
1864         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
1865                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
1866                 req_task->io_ports[7] = reply->control;
1867         } else {
1868                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
1869                 req_task->io_ports[7] = reply->command;
1870         }
1871 
1872         /* reclaim the DMA buffers.*/
1873         if (inbuf_dma)
1874                 dma_unmap_single(&dd->pdev->dev, inbuf_dma, taskin,
1875                                  DMA_FROM_DEVICE);
1876         if (outbuf_dma)
1877                 dma_unmap_single(&dd->pdev->dev, outbuf_dma, taskout,
1878                                  DMA_TO_DEVICE);
1879         inbuf_dma  = 0;
1880         outbuf_dma = 0;
1881 
1882         /* return the ATA registers to the caller.*/
1883         req_task->io_ports[1] = reply->features;
1884         req_task->io_ports[2] = reply->sect_count;
1885         req_task->io_ports[3] = reply->lba_low;
1886         req_task->io_ports[4] = reply->lba_mid;
1887         req_task->io_ports[5] = reply->lba_hi;
1888         req_task->io_ports[6] = reply->device;
1889 
1890         if (req_task->out_flags.all & 1)  {
1891 
1892                 req_task->hob_ports[3] = reply->lba_low_ex;
1893                 req_task->hob_ports[4] = reply->lba_mid_ex;
1894                 req_task->hob_ports[5] = reply->lba_hi_ex;
1895                 req_task->hob_ports[1] = reply->features_ex;
1896                 req_task->hob_ports[2] = reply->sect_cnt_ex;
1897         }
1898         dbg_printk(MTIP_DRV_NAME
1899                 " %s: Completion: stat %x,"
1900                 "err %x, sect_cnt %x, lbalo %x,"
1901                 "lbamid %x, lbahi %x, dev %x\n",
1902                 __func__,
1903                 req_task->io_ports[7],
1904                 req_task->io_ports[1],
1905                 req_task->io_ports[2],
1906                 req_task->io_ports[3],
1907                 req_task->io_ports[4],
1908                 req_task->io_ports[5],
1909                 req_task->io_ports[6]);
1910 
1911         if (taskout) {
1912                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
1913                         err = -EFAULT;
1914                         goto abort;
1915                 }
1916         }
1917         if (taskin) {
1918                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
1919                         err = -EFAULT;
1920                         goto abort;
1921                 }
1922         }
1923 abort:
1924         if (inbuf_dma)
1925                 dma_unmap_single(&dd->pdev->dev, inbuf_dma, taskin,
1926                                  DMA_FROM_DEVICE);
1927         if (outbuf_dma)
1928                 dma_unmap_single(&dd->pdev->dev, outbuf_dma, taskout,
1929                                  DMA_TO_DEVICE);
1930         kfree(outbuf);
1931         kfree(inbuf);
1932 
1933         return err;
1934 }
1935 
1936 /*
1937  * Handle IOCTL calls from the Block Layer.
1938  *
1939  * This function is called by the Block Layer when it receives an IOCTL
1940  * command that it does not understand. If the IOCTL command is not supported
1941  * this function returns -ENOTTY.
1942  *
1943  * @dd  Pointer to the driver data structure.
1944  * @cmd IOCTL command passed from the Block Layer.
1945  * @arg IOCTL argument passed from the Block Layer.
1946  *
1947  * return value
1948  *      0       The IOCTL completed successfully.
1949  *      -ENOTTY The specified command is not supported.
1950  *      -EFAULT An error occurred copying data to a user space buffer.
1951  *      -EIO    An error occurred while executing the command.
1952  */
1953 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
1954                          unsigned long arg)
1955 {
1956         switch (cmd) {
1957         case HDIO_GET_IDENTITY:
1958         {
1959                 if (copy_to_user((void __user *)arg, dd->port->identify,
1960                                                 sizeof(u16) * ATA_ID_WORDS))
1961                         return -EFAULT;
1962                 break;
1963         }
1964         case HDIO_DRIVE_CMD:
1965         {
1966                 u8 drive_command[4];
1967 
1968                 /* Copy the user command info to our buffer. */
1969                 if (copy_from_user(drive_command,
1970                                          (void __user *) arg,
1971                                          sizeof(drive_command)))
1972                         return -EFAULT;
1973 
1974                 /* Execute the drive command. */
1975                 if (exec_drive_command(dd->port,
1976                                          drive_command,
1977                                          (void __user *) (arg+4)))
1978                         return -EIO;
1979 
1980                 /* Copy the status back to the users buffer. */
1981                 if (copy_to_user((void __user *) arg,
1982                                          drive_command,
1983                                          sizeof(drive_command)))
1984                         return -EFAULT;
1985 
1986                 break;
1987         }
1988         case HDIO_DRIVE_TASK:
1989         {
1990                 u8 drive_command[7];
1991 
1992                 /* Copy the user command info to our buffer. */
1993                 if (copy_from_user(drive_command,
1994                                          (void __user *) arg,
1995                                          sizeof(drive_command)))
1996                         return -EFAULT;
1997 
1998                 /* Execute the drive command. */
1999                 if (exec_drive_task(dd->port, drive_command))
2000                         return -EIO;
2001 
2002                 /* Copy the status back to the users buffer. */
2003                 if (copy_to_user((void __user *) arg,
2004                                          drive_command,
2005                                          sizeof(drive_command)))
2006                         return -EFAULT;
2007 
2008                 break;
2009         }
2010         case HDIO_DRIVE_TASKFILE: {
2011                 ide_task_request_t req_task;
2012                 int ret, outtotal;
2013 
2014                 if (copy_from_user(&req_task, (void __user *) arg,
2015                                         sizeof(req_task)))
2016                         return -EFAULT;
2017 
2018                 outtotal = sizeof(req_task);
2019 
2020                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2021                                                 &req_task, outtotal);
2022 
2023                 if (copy_to_user((void __user *) arg, &req_task,
2024                                                         sizeof(req_task)))
2025                         return -EFAULT;
2026 
2027                 return ret;
2028         }
2029 
2030         default:
2031                 return -EINVAL;
2032         }
2033         return 0;
2034 }
2035 
2036 /*
2037  * Submit an IO to the hw
2038  *
2039  * This function is called by the block layer to issue an io
2040  * to the device. Upon completion, the callback function will
2041  * be called with the data parameter passed as the callback data.
2042  *
2043  * @dd       Pointer to the driver data structure.
2044  * @start    First sector to read.
2045  * @nsect    Number of sectors to read.
2046  * @tag      The tag of this read command.
2047  * @callback Pointer to the function that should be called
2048  *           when the read completes.
2049  * @data     Callback data passed to the callback function
2050  *           when the read completes.
2051  * @dir      Direction (read or write)
2052  *
2053  * return value
2054  *      None
2055  */
2056 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2057                               struct mtip_cmd *command,
2058                               struct blk_mq_hw_ctx *hctx)
2059 {
2060         struct mtip_cmd_hdr *hdr =
2061                 dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
2062         struct host_to_dev_fis  *fis;
2063         struct mtip_port *port = dd->port;
2064         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2065         u64 start = blk_rq_pos(rq);
2066         unsigned int nsect = blk_rq_sectors(rq);
2067         unsigned int nents;
2068 
2069         /* Map the scatter list for DMA access */
2070         nents = blk_rq_map_sg(hctx->queue, rq, command->sg);
2071         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2072 
2073         prefetch(&port->flags);
2074 
2075         command->scatter_ents = nents;
2076 
2077         /*
2078          * The number of retries for this command before it is
2079          * reported as a failure to the upper layers.
2080          */
2081         command->retries = MTIP_MAX_RETRIES;
2082 
2083         /* Fill out fis */
2084         fis = command->command;
2085         fis->type        = 0x27;
2086         fis->opts        = 1 << 7;
2087         if (dma_dir == DMA_FROM_DEVICE)
2088                 fis->command = ATA_CMD_FPDMA_READ;
2089         else
2090                 fis->command = ATA_CMD_FPDMA_WRITE;
2091         fis->lba_low     = start & 0xFF;
2092         fis->lba_mid     = (start >> 8) & 0xFF;
2093         fis->lba_hi      = (start >> 16) & 0xFF;
2094         fis->lba_low_ex  = (start >> 24) & 0xFF;
2095         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2096         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2097         fis->device      = 1 << 6;
2098         fis->features    = nsect & 0xFF;
2099         fis->features_ex = (nsect >> 8) & 0xFF;
2100         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2101         fis->sect_cnt_ex = 0;
2102         fis->control     = 0;
2103         fis->res2        = 0;
2104         fis->res3        = 0;
2105         fill_command_sg(dd, command, nents);
2106 
2107         if (unlikely(command->unaligned))
2108                 fis->device |= 1 << 7;
2109 
2110         /* Populate the command header */
2111         hdr->ctba = cpu_to_le32(command->command_dma & 0xFFFFFFFF);
2112         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
2113                 hdr->ctbau = cpu_to_le32((command->command_dma >> 16) >> 16);
2114         hdr->opts = cpu_to_le32((nents << 16) | 5 | AHCI_CMD_PREFETCH);
2115         hdr->byte_count = 0;
2116 
2117         command->direction = dma_dir;
2118 
2119         /*
2120          * To prevent this command from being issued
2121          * if an internal command is in progress or error handling is active.
2122          */
2123         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2124                 set_bit(rq->tag, port->cmds_to_issue);
2125                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2126                 return;
2127         }
2128 
2129         /* Issue the command to the hardware */
2130         mtip_issue_ncq_command(port, rq->tag);
2131 }
2132 
2133 /*
2134  * Sysfs status dump.
2135  *
2136  * @dev  Pointer to the device structure, passed by the kernrel.
2137  * @attr Pointer to the device_attribute structure passed by the kernel.
2138  * @buf  Pointer to the char buffer that will receive the stats info.
2139  *
2140  * return value
2141  *      The size, in bytes, of the data copied into buf.
2142  */
2143 static ssize_t mtip_hw_show_status(struct device *dev,
2144                                 struct device_attribute *attr,
2145                                 char *buf)
2146 {
2147         struct driver_data *dd = dev_to_disk(dev)->private_data;
2148         int size = 0;
2149 
2150         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2151                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2152         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2153                 size += sprintf(buf, "%s", "write_protect\n");
2154         else
2155                 size += sprintf(buf, "%s", "online\n");
2156 
2157         return size;
2158 }
2159 
2160 static DEVICE_ATTR(status, 0444, mtip_hw_show_status, NULL);
2161 
2162 /* debugsfs entries */
2163 
2164 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2165 {
2166         int size = 0;
2167         struct driver_data *dd, *tmp;
2168         unsigned long flags;
2169         char id_buf[42];
2170         u16 status = 0;
2171 
2172         spin_lock_irqsave(&dev_lock, flags);
2173         size += sprintf(&buf[size], "Devices Present:\n");
2174         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2175                 if (dd->pdev) {
2176                         if (dd->port &&
2177                             dd->port->identify &&
2178                             dd->port->identify_valid) {
2179                                 strlcpy(id_buf,
2180                                         (char *) (dd->port->identify + 10), 21);
2181                                 status = *(dd->port->identify + 141);
2182                         } else {
2183                                 memset(id_buf, 0, 42);
2184                                 status = 0;
2185                         }
2186 
2187                         if (dd->port &&
2188                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2189                                 size += sprintf(&buf[size],
2190                                         " device %s %s (ftl rebuild %d %%)\n",
2191                                         dev_name(&dd->pdev->dev),
2192                                         id_buf,
2193                                         status);
2194                         } else {
2195                                 size += sprintf(&buf[size],
2196                                         " device %s %s\n",
2197                                         dev_name(&dd->pdev->dev),
2198                                         id_buf);
2199                         }
2200                 }
2201         }
2202 
2203         size += sprintf(&buf[size], "Devices Being Removed:\n");
2204         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2205                 if (dd->pdev) {
2206                         if (dd->port &&
2207                             dd->port->identify &&
2208                             dd->port->identify_valid) {
2209                                 strlcpy(id_buf,
2210                                         (char *) (dd->port->identify+10), 21);
2211                                 status = *(dd->port->identify + 141);
2212                         } else {
2213                                 memset(id_buf, 0, 42);
2214                                 status = 0;
2215                         }
2216 
2217                         if (dd->port &&
2218                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2219                                 size += sprintf(&buf[size],
2220                                         " device %s %s (ftl rebuild %d %%)\n",
2221                                         dev_name(&dd->pdev->dev),
2222                                         id_buf,
2223                                         status);
2224                         } else {
2225                                 size += sprintf(&buf[size],
2226                                         " device %s %s\n",
2227                                         dev_name(&dd->pdev->dev),
2228                                         id_buf);
2229                         }
2230                 }
2231         }
2232         spin_unlock_irqrestore(&dev_lock, flags);
2233 
2234         return size;
2235 }
2236 
2237 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2238                                                 size_t len, loff_t *offset)
2239 {
2240         struct driver_data *dd =  (struct driver_data *)f->private_data;
2241         int size = *offset;
2242         char *buf;
2243         int rv = 0;
2244 
2245         if (!len || *offset)
2246                 return 0;
2247 
2248         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2249         if (!buf) {
2250                 dev_err(&dd->pdev->dev,
2251                         "Memory allocation: status buffer\n");
2252                 return -ENOMEM;
2253         }
2254 
2255         size += show_device_status(NULL, buf);
2256 
2257         *offset = size <= len ? size : len;
2258         size = copy_to_user(ubuf, buf, *offset);
2259         if (size)
2260                 rv = -EFAULT;
2261 
2262         kfree(buf);
2263         return rv ? rv : *offset;
2264 }
2265 
2266 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2267                                   size_t len, loff_t *offset)
2268 {
2269         struct driver_data *dd =  (struct driver_data *)f->private_data;
2270         char *buf;
2271         u32 group_allocated;
2272         int size = *offset;
2273         int n, rv = 0;
2274 
2275         if (!len || size)
2276                 return 0;
2277 
2278         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2279         if (!buf) {
2280                 dev_err(&dd->pdev->dev,
2281                         "Memory allocation: register buffer\n");
2282                 return -ENOMEM;
2283         }
2284 
2285         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2286 
2287         for (n = dd->slot_groups-1; n >= 0; n--)
2288                 size += sprintf(&buf[size], "%08X ",
2289                                          readl(dd->port->s_active[n]));
2290 
2291         size += sprintf(&buf[size], "]\n");
2292         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2293 
2294         for (n = dd->slot_groups-1; n >= 0; n--)
2295                 size += sprintf(&buf[size], "%08X ",
2296                                         readl(dd->port->cmd_issue[n]));
2297 
2298         size += sprintf(&buf[size], "]\n");
2299         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2300 
2301         for (n = dd->slot_groups-1; n >= 0; n--)
2302                 size += sprintf(&buf[size], "%08X ",
2303                                 readl(dd->port->completed[n]));
2304 
2305         size += sprintf(&buf[size], "]\n");
2306         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2307                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2308         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2309                                 readl(dd->mmio + HOST_IRQ_STAT));
2310         size += sprintf(&buf[size], "\n");
2311 
2312         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2313 
2314         for (n = dd->slot_groups-1; n >= 0; n--) {
2315                 if (sizeof(long) > sizeof(u32))
2316                         group_allocated =
2317                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2318                 else
2319                         group_allocated = dd->port->cmds_to_issue[n];
2320                 size += sprintf(&buf[size], "%08X ", group_allocated);
2321         }
2322         size += sprintf(&buf[size], "]\n");
2323 
2324         *offset = size <= len ? size : len;
2325         size = copy_to_user(ubuf, buf, *offset);
2326         if (size)
2327                 rv = -EFAULT;
2328 
2329         kfree(buf);
2330         return rv ? rv : *offset;
2331 }
2332 
2333 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2334                                   size_t len, loff_t *offset)
2335 {
2336         struct driver_data *dd =  (struct driver_data *)f->private_data;
2337         char *buf;
2338         int size = *offset;
2339         int rv = 0;
2340 
2341         if (!len || size)
2342                 return 0;
2343 
2344         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2345         if (!buf) {
2346                 dev_err(&dd->pdev->dev,
2347                         "Memory allocation: flag buffer\n");
2348                 return -ENOMEM;
2349         }
2350 
2351         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2352                                                         dd->port->flags);
2353         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2354                                                         dd->dd_flag);
2355 
2356         *offset = size <= len ? size : len;
2357         size = copy_to_user(ubuf, buf, *offset);
2358         if (size)
2359                 rv = -EFAULT;
2360 
2361         kfree(buf);
2362         return rv ? rv : *offset;
2363 }
2364 
2365 static const struct file_operations mtip_device_status_fops = {
2366         .owner  = THIS_MODULE,
2367         .open   = simple_open,
2368         .read   = mtip_hw_read_device_status,
2369         .llseek = no_llseek,
2370 };
2371 
2372 static const struct file_operations mtip_regs_fops = {
2373         .owner  = THIS_MODULE,
2374         .open   = simple_open,
2375         .read   = mtip_hw_read_registers,
2376         .llseek = no_llseek,
2377 };
2378 
2379 static const struct file_operations mtip_flags_fops = {
2380         .owner  = THIS_MODULE,
2381         .open   = simple_open,
2382         .read   = mtip_hw_read_flags,
2383         .llseek = no_llseek,
2384 };
2385 
2386 /*
2387  * Create the sysfs related attributes.
2388  *
2389  * @dd   Pointer to the driver data structure.
2390  * @kobj Pointer to the kobj for the block device.
2391  *
2392  * return value
2393  *      0       Operation completed successfully.
2394  *      -EINVAL Invalid parameter.
2395  */
2396 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2397 {
2398         if (!kobj || !dd)
2399                 return -EINVAL;
2400 
2401         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2402                 dev_warn(&dd->pdev->dev,
2403                         "Error creating 'status' sysfs entry\n");
2404         return 0;
2405 }
2406 
2407 /*
2408  * Remove the sysfs related attributes.
2409  *
2410  * @dd   Pointer to the driver data structure.
2411  * @kobj Pointer to the kobj for the block device.
2412  *
2413  * return value
2414  *      0       Operation completed successfully.
2415  *      -EINVAL Invalid parameter.
2416  */
2417 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2418 {
2419         if (!kobj || !dd)
2420                 return -EINVAL;
2421 
2422         sysfs_remove_file(kobj, &dev_attr_status.attr);
2423 
2424         return 0;
2425 }
2426 
2427 static int mtip_hw_debugfs_init(struct driver_data *dd)
2428 {
2429         if (!dfs_parent)
2430                 return -1;
2431 
2432         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2433         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2434                 dev_warn(&dd->pdev->dev,
2435                         "Error creating node %s under debugfs\n",
2436                                                 dd->disk->disk_name);
2437                 dd->dfs_node = NULL;
2438                 return -1;
2439         }
2440 
2441         debugfs_create_file("flags", 0444, dd->dfs_node, dd, &mtip_flags_fops);
2442         debugfs_create_file("registers", 0444, dd->dfs_node, dd,
2443                             &mtip_regs_fops);
2444 
2445         return 0;
2446 }
2447 
2448 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2449 {
2450         debugfs_remove_recursive(dd->dfs_node);
2451 }
2452 
2453 /*
2454  * Perform any init/resume time hardware setup
2455  *
2456  * @dd Pointer to the driver data structure.
2457  *
2458  * return value
2459  *      None
2460  */
2461 static inline void hba_setup(struct driver_data *dd)
2462 {
2463         u32 hwdata;
2464         hwdata = readl(dd->mmio + HOST_HSORG);
2465 
2466         /* interrupt bug workaround: use only 1 IS bit.*/
2467         writel(hwdata |
2468                 HSORG_DISABLE_SLOTGRP_INTR |
2469                 HSORG_DISABLE_SLOTGRP_PXIS,
2470                 dd->mmio + HOST_HSORG);
2471 }
2472 
2473 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2474 {
2475         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2476 }
2477 
2478 /*
2479  * Detect the details of the product, and store anything needed
2480  * into the driver data structure.  This includes product type and
2481  * version and number of slot groups.
2482  *
2483  * @dd Pointer to the driver data structure.
2484  *
2485  * return value
2486  *      None
2487  */
2488 static void mtip_detect_product(struct driver_data *dd)
2489 {
2490         u32 hwdata;
2491         unsigned int rev, slotgroups;
2492 
2493         /*
2494          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2495          * info register:
2496          * [15:8] hardware/software interface rev#
2497          * [   3] asic-style interface
2498          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2499          */
2500         hwdata = readl(dd->mmio + HOST_HSORG);
2501 
2502         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2503         dd->slot_groups = 1;
2504 
2505         if (hwdata & 0x8) {
2506                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2507                 rev = (hwdata & HSORG_HWREV) >> 8;
2508                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2509                 dev_info(&dd->pdev->dev,
2510                         "ASIC-FPGA design, HS rev 0x%x, "
2511                         "%i slot groups [%i slots]\n",
2512                          rev,
2513                          slotgroups,
2514                          slotgroups * 32);
2515 
2516                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2517                         dev_warn(&dd->pdev->dev,
2518                                 "Warning: driver only supports "
2519                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2520                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2521                 }
2522                 dd->slot_groups = slotgroups;
2523                 return;
2524         }
2525 
2526         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2527 }
2528 
2529 /*
2530  * Blocking wait for FTL rebuild to complete
2531  *
2532  * @dd Pointer to the DRIVER_DATA structure.
2533  *
2534  * return value
2535  *      0       FTL rebuild completed successfully
2536  *      -EFAULT FTL rebuild error/timeout/interruption
2537  */
2538 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2539 {
2540         unsigned long timeout, cnt = 0, start;
2541 
2542         dev_warn(&dd->pdev->dev,
2543                 "FTL rebuild in progress. Polling for completion.\n");
2544 
2545         start = jiffies;
2546         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2547 
2548         do {
2549                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2550                                 &dd->dd_flag)))
2551                         return -EFAULT;
2552                 if (mtip_check_surprise_removal(dd->pdev))
2553                         return -EFAULT;
2554 
2555                 if (mtip_get_identify(dd->port, NULL) < 0)
2556                         return -EFAULT;
2557 
2558                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2559                         MTIP_FTL_REBUILD_MAGIC) {
2560                         ssleep(1);
2561                         /* Print message every 3 minutes */
2562                         if (cnt++ >= 180) {
2563                                 dev_warn(&dd->pdev->dev,
2564                                 "FTL rebuild in progress (%d secs).\n",
2565                                 jiffies_to_msecs(jiffies - start) / 1000);
2566                                 cnt = 0;
2567                         }
2568                 } else {
2569                         dev_warn(&dd->pdev->dev,
2570                                 "FTL rebuild complete (%d secs).\n",
2571                         jiffies_to_msecs(jiffies - start) / 1000);
2572                         mtip_block_initialize(dd);
2573                         return 0;
2574                 }
2575         } while (time_before(jiffies, timeout));
2576 
2577         /* Check for timeout */
2578         dev_err(&dd->pdev->dev,
2579                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2580                 jiffies_to_msecs(jiffies - start) / 1000);
2581         return -EFAULT;
2582 }
2583 
2584 static void mtip_softirq_done_fn(struct request *rq)
2585 {
2586         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
2587         struct driver_data *dd = rq->q->queuedata;
2588 
2589         /* Unmap the DMA scatter list entries */
2590         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents,
2591                                                         cmd->direction);
2592 
2593         if (unlikely(cmd->unaligned))
2594                 atomic_inc(&dd->port->cmd_slot_unal);
2595 
2596         blk_mq_end_request(rq, cmd->status);
2597 }
2598 
2599 static bool mtip_abort_cmd(struct request *req, void *data, bool reserved)
2600 {
2601         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
2602         struct driver_data *dd = data;
2603 
2604         dbg_printk(MTIP_DRV_NAME " Aborting request, tag = %d\n", req->tag);
2605 
2606         clear_bit(req->tag, dd->port->cmds_to_issue);
2607         cmd->status = BLK_STS_IOERR;
2608         mtip_softirq_done_fn(req);
2609         return true;
2610 }
2611 
2612 static bool mtip_queue_cmd(struct request *req, void *data, bool reserved)
2613 {
2614         struct driver_data *dd = data;
2615 
2616         set_bit(req->tag, dd->port->cmds_to_issue);
2617         blk_abort_request(req);
2618         return true;
2619 }
2620 
2621 /*
2622  * service thread to issue queued commands
2623  *
2624  * @data Pointer to the driver data structure.
2625  *
2626  * return value
2627  *      0
2628  */
2629 
2630 static int mtip_service_thread(void *data)
2631 {
2632         struct driver_data *dd = (struct driver_data *)data;
2633         unsigned long slot, slot_start, slot_wrap, to;
2634         unsigned int num_cmd_slots = dd->slot_groups * 32;
2635         struct mtip_port *port = dd->port;
2636 
2637         while (1) {
2638                 if (kthread_should_stop() ||
2639                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2640                         goto st_out;
2641                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2642 
2643                 /*
2644                  * the condition is to check neither an internal command is
2645                  * is in progress nor error handling is active
2646                  */
2647                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2648                         (port->flags & MTIP_PF_SVC_THD_WORK));
2649 
2650                 if (kthread_should_stop() ||
2651                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2652                         goto st_out;
2653 
2654                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2655                                 &dd->dd_flag)))
2656                         goto st_out;
2657 
2658                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2659 
2660 restart_eh:
2661                 /* Demux bits: start with error handling */
2662                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2663                         mtip_handle_tfe(dd);
2664                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2665                 }
2666 
2667                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2668                         goto restart_eh;
2669 
2670                 if (test_bit(MTIP_PF_TO_ACTIVE_BIT, &port->flags)) {
2671                         to = jiffies + msecs_to_jiffies(5000);
2672 
2673                         do {
2674                                 mdelay(100);
2675                         } while (atomic_read(&dd->irq_workers_active) != 0 &&
2676                                 time_before(jiffies, to));
2677 
2678                         if (atomic_read(&dd->irq_workers_active) != 0)
2679                                 dev_warn(&dd->pdev->dev,
2680                                         "Completion workers still active!");
2681 
2682                         blk_mq_quiesce_queue(dd->queue);
2683 
2684                         blk_mq_tagset_busy_iter(&dd->tags, mtip_queue_cmd, dd);
2685 
2686                         set_bit(MTIP_PF_ISSUE_CMDS_BIT, &dd->port->flags);
2687 
2688                         if (mtip_device_reset(dd))
2689                                 blk_mq_tagset_busy_iter(&dd->tags,
2690                                                         mtip_abort_cmd, dd);
2691 
2692                         clear_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags);
2693 
2694                         blk_mq_unquiesce_queue(dd->queue);
2695                 }
2696 
2697                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2698                         slot = 1;
2699                         /* used to restrict the loop to one iteration */
2700                         slot_start = num_cmd_slots;
2701                         slot_wrap = 0;
2702                         while (1) {
2703                                 slot = find_next_bit(port->cmds_to_issue,
2704                                                 num_cmd_slots, slot);
2705                                 if (slot_wrap == 1) {
2706                                         if ((slot_start >= slot) ||
2707                                                 (slot >= num_cmd_slots))
2708                                                 break;
2709                                 }
2710                                 if (unlikely(slot_start == num_cmd_slots))
2711                                         slot_start = slot;
2712 
2713                                 if (unlikely(slot == num_cmd_slots)) {
2714                                         slot = 1;
2715                                         slot_wrap = 1;
2716                                         continue;
2717                                 }
2718 
2719                                 /* Issue the command to the hardware */
2720                                 mtip_issue_ncq_command(port, slot);
2721 
2722                                 clear_bit(slot, port->cmds_to_issue);
2723                         }
2724 
2725                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2726                 }
2727 
2728                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2729                         if (mtip_ftl_rebuild_poll(dd) == 0)
2730                                 clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2731                 }
2732         }
2733 
2734 st_out:
2735         return 0;
2736 }
2737 
2738 /*
2739  * DMA region teardown
2740  *
2741  * @dd Pointer to driver_data structure
2742  *
2743  * return value
2744  *      None
2745  */
2746 static void mtip_dma_free(struct driver_data *dd)
2747 {
2748         struct mtip_port *port = dd->port;
2749 
2750         if (port->block1)
2751                 dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2752                                         port->block1, port->block1_dma);
2753 
2754         if (port->command_list) {
2755                 dma_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2756                                 port->command_list, port->command_list_dma);
2757         }
2758 }
2759 
2760 /*
2761  * DMA region setup
2762  *
2763  * @dd Pointer to driver_data structure
2764  *
2765  * return value
2766  *      -ENOMEM Not enough free DMA region space to initialize driver
2767  */
2768 static int mtip_dma_alloc(struct driver_data *dd)
2769 {
2770         struct mtip_port *port = dd->port;
2771 
2772         /* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
2773         port->block1 =
2774                 dma_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2775                                         &port->block1_dma, GFP_KERNEL);
2776         if (!port->block1)
2777                 return -ENOMEM;
2778 
2779         /* Allocate dma memory for command list */
2780         port->command_list =
2781                 dma_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2782                                         &port->command_list_dma, GFP_KERNEL);
2783         if (!port->command_list) {
2784                 dma_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2785                                         port->block1, port->block1_dma);
2786                 port->block1 = NULL;
2787                 port->block1_dma = 0;
2788                 return -ENOMEM;
2789         }
2790 
2791         /* Setup all pointers into first DMA region */
2792         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
2793         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
2794         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
2795         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
2796         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
2797         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
2798         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
2799         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
2800 
2801         return 0;
2802 }
2803 
2804 static int mtip_hw_get_identify(struct driver_data *dd)
2805 {
2806         struct smart_attr attr242;
2807         unsigned char *buf;
2808         int rv;
2809 
2810         if (mtip_get_identify(dd->port, NULL) < 0)
2811                 return -EFAULT;
2812 
2813         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2814                 MTIP_FTL_REBUILD_MAGIC) {
2815                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
2816                 return MTIP_FTL_REBUILD_MAGIC;
2817         }
2818         mtip_dump_identify(dd->port);
2819 
2820         /* check write protect, over temp and rebuild statuses */
2821         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
2822                                 dd->port->log_buf,
2823                                 dd->port->log_buf_dma, 1);
2824         if (rv) {
2825                 dev_warn(&dd->pdev->dev,
2826                         "Error in READ LOG EXT (10h) command\n");
2827                 /* non-critical error, don't fail the load */
2828         } else {
2829                 buf = (unsigned char *)dd->port->log_buf;
2830                 if (buf[259] & 0x1) {
2831                         dev_info(&dd->pdev->dev,
2832                                 "Write protect bit is set.\n");
2833                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
2834                 }
2835                 if (buf[288] == 0xF7) {
2836                         dev_info(&dd->pdev->dev,
2837                                 "Exceeded Tmax, drive in thermal shutdown.\n");
2838                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
2839                 }
2840                 if (buf[288] == 0xBF) {
2841                         dev_info(&dd->pdev->dev,
2842                                 "Drive indicates rebuild has failed.\n");
2843                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
2844                 }
2845         }
2846 
2847         /* get write protect progess */
2848         memset(&attr242, 0, sizeof(struct smart_attr));
2849         if (mtip_get_smart_attr(dd->port, 242, &attr242))
2850                 dev_warn(&dd->pdev->dev,
2851                                 "Unable to check write protect progress\n");
2852         else
2853                 dev_info(&dd->pdev->dev,
2854                                 "Write protect progress: %u%% (%u blocks)\n",
2855                                 attr242.cur, le32_to_cpu(attr242.data));
2856 
2857         return rv;
2858 }
2859 
2860 /*
2861  * Called once for each card.
2862  *
2863  * @dd Pointer to the driver data structure.
2864  *
2865  * return value
2866  *      0 on success, else an error code.
2867  */
2868 static int mtip_hw_init(struct driver_data *dd)
2869 {
2870         int i;
2871         int rv;
2872         unsigned long timeout, timetaken;
2873 
2874         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
2875 
2876         mtip_detect_product(dd);
2877         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
2878                 rv = -EIO;
2879                 goto out1;
2880         }
2881 
2882         hba_setup(dd);
2883 
2884         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
2885                                 dd->numa_node);
2886         if (!dd->port) {
2887                 dev_err(&dd->pdev->dev,
2888                         "Memory allocation: port structure\n");
2889                 return -ENOMEM;
2890         }
2891 
2892         /* Continue workqueue setup */
2893         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
2894                 dd->work[i].port = dd->port;
2895 
2896         /* Enable unaligned IO constraints for some devices */
2897         if (mtip_device_unaligned_constrained(dd))
2898                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
2899         else
2900                 dd->unal_qdepth = 0;
2901 
2902         atomic_set(&dd->port->cmd_slot_unal, dd->unal_qdepth);
2903 
2904         /* Spinlock to prevent concurrent issue */
2905         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
2906                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
2907 
2908         /* Set the port mmio base address. */
2909         dd->port->mmio  = dd->mmio + PORT_OFFSET;
2910         dd->port->dd    = dd;
2911 
2912         /* DMA allocations */
2913         rv = mtip_dma_alloc(dd);
2914         if (rv < 0)
2915                 goto out1;
2916 
2917         /* Setup the pointers to the extended s_active and CI registers. */
2918         for (i = 0; i < dd->slot_groups; i++) {
2919                 dd->port->s_active[i] =
2920                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
2921                 dd->port->cmd_issue[i] =
2922                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
2923                 dd->port->completed[i] =
2924                         dd->port->mmio + i*0x80 + PORT_SDBV;
2925         }
2926 
2927         timetaken = jiffies;
2928         timeout = jiffies + msecs_to_jiffies(30000);
2929         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
2930                  time_before(jiffies, timeout)) {
2931                 mdelay(100);
2932         }
2933         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
2934                 timetaken = jiffies - timetaken;
2935                 dev_warn(&dd->pdev->dev,
2936                         "Surprise removal detected at %u ms\n",
2937                         jiffies_to_msecs(timetaken));
2938                 rv = -ENODEV;
2939                 goto out2 ;
2940         }
2941         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2942                 timetaken = jiffies - timetaken;
2943                 dev_warn(&dd->pdev->dev,
2944                         "Removal detected at %u ms\n",
2945                         jiffies_to_msecs(timetaken));
2946                 rv = -EFAULT;
2947                 goto out2;
2948         }
2949 
2950         /* Conditionally reset the HBA. */
2951         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
2952                 if (mtip_hba_reset(dd) < 0) {
2953                         dev_err(&dd->pdev->dev,
2954                                 "Card did not reset within timeout\n");
2955                         rv = -EIO;
2956                         goto out2;
2957                 }
2958         } else {
2959                 /* Clear any pending interrupts on the HBA */
2960                 writel(readl(dd->mmio + HOST_IRQ_STAT),
2961                         dd->mmio + HOST_IRQ_STAT);
2962         }
2963 
2964         mtip_init_port(dd->port);
2965         mtip_start_port(dd->port);
2966 
2967         /* Setup the ISR and enable interrupts. */
2968         rv = request_irq(dd->pdev->irq, mtip_irq_handler, IRQF_SHARED,
2969                          dev_driver_string(&dd->pdev->dev), dd);
2970         if (rv) {
2971                 dev_err(&dd->pdev->dev,
2972                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
2973                 goto out2;
2974         }
2975         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
2976 
2977         /* Enable interrupts on the HBA. */
2978         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
2979                                         dd->mmio + HOST_CTL);
2980 
2981         init_waitqueue_head(&dd->port->svc_wait);
2982 
2983         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
2984                 rv = -EFAULT;
2985                 goto out3;
2986         }
2987 
2988         return rv;
2989 
2990 out3:
2991         /* Disable interrupts on the HBA. */
2992         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
2993                         dd->mmio + HOST_CTL);
2994 
2995         /* Release the IRQ. */
2996         irq_set_affinity_hint(dd->pdev->irq, NULL);
2997         free_irq(dd->pdev->irq, dd);
2998 
2999 out2:
3000         mtip_deinit_port(dd->port);
3001         mtip_dma_free(dd);
3002 
3003 out1:
3004         /* Free the memory allocated for the for structure. */
3005         kfree(dd->port);
3006 
3007         return rv;
3008 }
3009 
3010 static int mtip_standby_drive(struct driver_data *dd)
3011 {
3012         int rv = 0;
3013 
3014         if (dd->sr || !dd->port)
3015                 return -ENODEV;
3016         /*
3017          * Send standby immediate (E0h) to the drive so that it
3018          * saves its state.
3019          */
3020         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
3021             !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
3022             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
3023                 rv = mtip_standby_immediate(dd->port);
3024                 if (rv)
3025                         dev_warn(&dd->pdev->dev,
3026                                 "STANDBY IMMEDIATE failed\n");
3027         }
3028         return rv;
3029 }
3030 
3031 /*
3032  * Called to deinitialize an interface.
3033  *
3034  * @dd Pointer to the driver data structure.
3035  *
3036  * return value
3037  *      0
3038  */
3039 static int mtip_hw_exit(struct driver_data *dd)
3040 {
3041         if (!dd->sr) {
3042                 /* de-initialize the port. */
3043                 mtip_deinit_port(dd->port);
3044 
3045                 /* Disable interrupts on the HBA. */
3046                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3047                                 dd->mmio + HOST_CTL);
3048         }
3049 
3050         /* Release the IRQ. */
3051         irq_set_affinity_hint(dd->pdev->irq, NULL);
3052         free_irq(dd->pdev->irq, dd);
3053         msleep(1000);
3054 
3055         /* Free dma regions */
3056         mtip_dma_free(dd);
3057 
3058         /* Free the memory allocated for the for structure. */
3059         kfree(dd->port);
3060         dd->port = NULL;
3061 
3062         return 0;
3063 }
3064 
3065 /*
3066  * Issue a Standby Immediate command to the device.
3067  *
3068  * This function is called by the Block Layer just before the
3069  * system powers off during a shutdown.
3070  *
3071  * @dd Pointer to the driver data structure.
3072  *
3073  * return value
3074  *      0
3075  */
3076 static int mtip_hw_shutdown(struct driver_data *dd)
3077 {
3078         /*
3079          * Send standby immediate (E0h) to the drive so that it
3080          * saves its state.
3081          */
3082         mtip_standby_drive(dd);
3083 
3084         return 0;
3085 }
3086 
3087 /*
3088  * Suspend function
3089  *
3090  * This function is called by the Block Layer just before the
3091  * system hibernates.
3092  *
3093  * @dd Pointer to the driver data structure.
3094  *
3095  * return value
3096  *      0       Suspend was successful
3097  *      -EFAULT Suspend was not successful
3098  */
3099 static int mtip_hw_suspend(struct driver_data *dd)
3100 {
3101         /*
3102          * Send standby immediate (E0h) to the drive
3103          * so that it saves its state.
3104          */
3105         if (mtip_standby_drive(dd) != 0) {
3106                 dev_err(&dd->pdev->dev,
3107                         "Failed standby-immediate command\n");
3108                 return -EFAULT;
3109         }
3110 
3111         /* Disable interrupts on the HBA.*/
3112         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3113                         dd->mmio + HOST_CTL);
3114         mtip_deinit_port(dd->port);
3115 
3116         return 0;
3117 }
3118 
3119 /*
3120  * Resume function
3121  *
3122  * This function is called by the Block Layer as the
3123  * system resumes.
3124  *
3125  * @dd Pointer to the driver data structure.
3126  *
3127  * return value
3128  *      0       Resume was successful
3129  *      -EFAULT Resume was not successful
3130  */
3131 static int mtip_hw_resume(struct driver_data *dd)
3132 {
3133         /* Perform any needed hardware setup steps */
3134         hba_setup(dd);
3135 
3136         /* Reset the HBA */
3137         if (mtip_hba_reset(dd) != 0) {
3138                 dev_err(&dd->pdev->dev,
3139                         "Unable to reset the HBA\n");
3140                 return -EFAULT;
3141         }
3142 
3143         /*
3144          * Enable the port, DMA engine, and FIS reception specific
3145          * h/w in controller.
3146          */
3147         mtip_init_port(dd->port);
3148         mtip_start_port(dd->port);
3149 
3150         /* Enable interrupts on the HBA.*/
3151         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3152                         dd->mmio + HOST_CTL);
3153 
3154         return 0;
3155 }
3156 
3157 /*
3158  * Helper function for reusing disk name
3159  * upon hot insertion.
3160  */
3161 static int rssd_disk_name_format(char *prefix,
3162                                  int index,
3163                                  char *buf,
3164                                  int buflen)
3165 {
3166         const int base = 'z' - 'a' + 1;
3167         char *begin = buf + strlen(prefix);
3168         char *end = buf + buflen;
3169         char *p;
3170         int unit;
3171 
3172         p = end - 1;
3173         *p = '\0';
3174         unit = base;
3175         do {
3176                 if (p == begin)
3177                         return -EINVAL;
3178                 *--p = 'a' + (index % unit);
3179                 index = (index / unit) - 1;
3180         } while (index >= 0);
3181 
3182         memmove(begin, p, end - p);
3183         memcpy(buf, prefix, strlen(prefix));
3184 
3185         return 0;
3186 }
3187 
3188 /*
3189  * Block layer IOCTL handler.
3190  *
3191  * @dev Pointer to the block_device structure.
3192  * @mode ignored
3193  * @cmd IOCTL command passed from the user application.
3194  * @arg Argument passed from the user application.
3195  *
3196  * return value
3197  *      0        IOCTL completed successfully.
3198  *      -ENOTTY  IOCTL not supported or invalid driver data
3199  *                 structure pointer.
3200  */
3201 static int mtip_block_ioctl(struct block_device *dev,
3202                             fmode_t mode,
3203                             unsigned cmd,
3204                             unsigned long arg)
3205 {
3206         struct driver_data *dd = dev->bd_disk->private_data;
3207 
3208         if (!capable(CAP_SYS_ADMIN))
3209                 return -EACCES;
3210 
3211         if (!dd)
3212                 return -ENOTTY;
3213 
3214         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3215                 return -ENOTTY;
3216 
3217         switch (cmd) {
3218         case BLKFLSBUF:
3219                 return -ENOTTY;
3220         default:
3221                 return mtip_hw_ioctl(dd, cmd, arg);
3222         }
3223 }
3224 
3225 #ifdef CONFIG_COMPAT
3226 /*
3227  * Block layer compat IOCTL handler.
3228  *
3229  * @dev Pointer to the block_device structure.
3230  * @mode ignored
3231  * @cmd IOCTL command passed from the user application.
3232  * @arg Argument passed from the user application.
3233  *
3234  * return value
3235  *      0        IOCTL completed successfully.
3236  *      -ENOTTY  IOCTL not supported or invalid driver data
3237  *                 structure pointer.
3238  */
3239 static int mtip_block_compat_ioctl(struct block_device *dev,
3240                             fmode_t mode,
3241                             unsigned cmd,
3242                             unsigned long arg)
3243 {
3244         struct driver_data *dd = dev->bd_disk->private_data;
3245 
3246         if (!capable(CAP_SYS_ADMIN))
3247                 return -EACCES;
3248 
3249         if (!dd)
3250                 return -ENOTTY;
3251 
3252         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3253                 return -ENOTTY;
3254 
3255         switch (cmd) {
3256         case BLKFLSBUF:
3257                 return -ENOTTY;
3258         case HDIO_DRIVE_TASKFILE: {
3259                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3260                 ide_task_request_t req_task;
3261                 int compat_tasksize, outtotal, ret;
3262 
3263                 compat_tasksize =
3264                         sizeof(struct mtip_compat_ide_task_request_s);
3265 
3266                 compat_req_task =
3267                         (struct mtip_compat_ide_task_request_s __user *) arg;
3268 
3269                 if (copy_from_user(&req_task, (void __user *) arg,
3270                         compat_tasksize - (2 * sizeof(compat_long_t))))
3271                         return -EFAULT;
3272 
3273                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3274                         return -EFAULT;
3275 
3276                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3277                         return -EFAULT;
3278 
3279                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3280 
3281                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3282                                                 &req_task, outtotal);
3283 
3284                 if (copy_to_user((void __user *) arg, &req_task,
3285                                 compat_tasksize -
3286                                 (2 * sizeof(compat_long_t))))
3287                         return -EFAULT;
3288 
3289                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3290                         return -EFAULT;
3291 
3292                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3293                         return -EFAULT;
3294 
3295                 return ret;
3296         }
3297         default:
3298                 return mtip_hw_ioctl(dd, cmd, arg);
3299         }
3300 }
3301 #endif
3302 
3303 /*
3304  * Obtain the geometry of the device.
3305  *
3306  * You may think that this function is obsolete, but some applications,
3307  * fdisk for example still used CHS values. This function describes the
3308  * device as having 224 heads and 56 sectors per cylinder. These values are
3309  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3310  * partition is described in terms of a start and end cylinder this means
3311  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3312  * affects performance.
3313  *
3314  * @dev Pointer to the block_device strucutre.
3315  * @geo Pointer to a hd_geometry structure.
3316  *
3317  * return value
3318  *      0       Operation completed successfully.
3319  *      -ENOTTY An error occurred while reading the drive capacity.
3320  */
3321 static int mtip_block_getgeo(struct block_device *dev,
3322                                 struct hd_geometry *geo)
3323 {
3324         struct driver_data *dd = dev->bd_disk->private_data;
3325         sector_t capacity;
3326 
3327         if (!dd)
3328                 return -ENOTTY;
3329 
3330         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3331                 dev_warn(&dd->pdev->dev,
3332                         "Could not get drive capacity.\n");
3333                 return -ENOTTY;
3334         }
3335 
3336         geo->heads = 224;
3337         geo->sectors = 56;
3338         sector_div(capacity, (geo->heads * geo->sectors));
3339         geo->cylinders = capacity;
3340         return 0;
3341 }
3342 
3343 static int mtip_block_open(struct block_device *dev, fmode_t mode)
3344 {
3345         struct driver_data *dd;
3346 
3347         if (dev && dev->bd_disk) {
3348                 dd = (struct driver_data *) dev->bd_disk->private_data;
3349 
3350                 if (dd) {
3351                         if (test_bit(MTIP_DDF_REMOVAL_BIT,
3352                                                         &dd->dd_flag)) {
3353                                 return -ENODEV;
3354                         }
3355                         return 0;
3356                 }
3357         }
3358         return -ENODEV;
3359 }
3360 
3361 static void mtip_block_release(struct gendisk *disk, fmode_t mode)
3362 {
3363 }
3364 
3365 /*
3366  * Block device operation function.
3367  *
3368  * This structure contains pointers to the functions required by the block
3369  * layer.
3370  */
3371 static const struct block_device_operations mtip_block_ops = {
3372         .open           = mtip_block_open,
3373         .release        = mtip_block_release,
3374         .ioctl          = mtip_block_ioctl,
3375 #ifdef CONFIG_COMPAT
3376         .compat_ioctl   = mtip_block_compat_ioctl,
3377 #endif
3378         .getgeo         = mtip_block_getgeo,
3379         .owner          = THIS_MODULE
3380 };
3381 
3382 static inline bool is_se_active(struct driver_data *dd)
3383 {
3384         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3385                 if (dd->port->ic_pause_timer) {
3386                         unsigned long to = dd->port->ic_pause_timer +
3387                                                         msecs_to_jiffies(1000);
3388                         if (time_after(jiffies, to)) {
3389                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3390                                                         &dd->port->flags);
3391                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3392                                 dd->port->ic_pause_timer = 0;
3393                                 wake_up_interruptible(&dd->port->svc_wait);
3394                                 return false;
3395                         }
3396                 }
3397                 return true;
3398         }
3399         return false;
3400 }
3401 
3402 static inline bool is_stopped(struct driver_data *dd, struct request *rq)
3403 {
3404         if (likely(!(dd->dd_flag & MTIP_DDF_STOP_IO)))
3405                 return false;
3406 
3407         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
3408                 return true;
3409         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
3410                 return true;
3411         if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag) &&
3412             rq_data_dir(rq))
3413                 return true;
3414         if (test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))
3415                 return true;
3416         if (test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag))
3417                 return true;
3418 
3419         return false;
3420 }
3421 
3422 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3423                                   struct request *rq)
3424 {
3425         struct driver_data *dd = hctx->queue->queuedata;
3426         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3427 
3428         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3429                 return false;
3430 
3431         /*
3432          * If unaligned depth must be limited on this controller, mark it
3433          * as unaligned if the IO isn't on a 4k boundary (start of length).
3434          */
3435         if (blk_rq_sectors(rq) <= 64) {
3436                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3437                         cmd->unaligned = 1;
3438         }
3439 
3440         if (cmd->unaligned && atomic_dec_if_positive(&dd->port->cmd_slot_unal) >= 0)
3441                 return true;
3442 
3443         return false;
3444 }
3445 
3446 static blk_status_t mtip_issue_reserved_cmd(struct blk_mq_hw_ctx *hctx,
3447                 struct request *rq)
3448 {
3449         struct driver_data *dd = hctx->queue->queuedata;
3450         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3451         struct mtip_int_cmd *icmd = cmd->icmd;
3452         struct mtip_cmd_hdr *hdr =
3453                 dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
3454         struct mtip_cmd_sg *command_sg;
3455 
3456         if (mtip_commands_active(dd->port))
3457                 return BLK_STS_DEV_RESOURCE;
3458 
3459         hdr->ctba = cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
3460         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
3461                 hdr->ctbau = cpu_to_le32((cmd->command_dma >> 16) >> 16);
3462         /* Populate the SG list */
3463         hdr->opts = cpu_to_le32(icmd->opts | icmd->fis_len);
3464         if (icmd->buf_len) {
3465                 command_sg = cmd->command + AHCI_CMD_TBL_HDR_SZ;
3466 
3467                 command_sg->info = cpu_to_le32((icmd->buf_len-1) & 0x3FFFFF);
3468                 command_sg->dba = cpu_to_le32(icmd->buffer & 0xFFFFFFFF);
3469                 command_sg->dba_upper =
3470                         cpu_to_le32((icmd->buffer >> 16) >> 16);
3471 
3472                 hdr->opts |= cpu_to_le32((1 << 16));
3473         }
3474 
3475         /* Populate the command header */
3476         hdr->byte_count = 0;
3477 
3478         blk_mq_start_request(rq);
3479         mtip_issue_non_ncq_command(dd->port, rq->tag);
3480         return 0;
3481 }
3482 
3483 static blk_status_t mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3484                          const struct blk_mq_queue_data *bd)
3485 {
3486         struct driver_data *dd = hctx->queue->queuedata;
3487         struct request *rq = bd->rq;
3488         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3489 
3490         if (blk_rq_is_passthrough(rq))
3491                 return mtip_issue_reserved_cmd(hctx, rq);
3492 
3493         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3494                 return BLK_STS_DEV_RESOURCE;
3495 
3496         if (is_se_active(dd) || is_stopped(dd, rq))
3497                 return BLK_STS_IOERR;
3498 
3499         blk_mq_start_request(rq);
3500 
3501         mtip_hw_submit_io(dd, rq, cmd, hctx);
3502         return BLK_STS_OK;
3503 }
3504 
3505 static void mtip_free_cmd(struct blk_mq_tag_set *set, struct request *rq,
3506                           unsigned int hctx_idx)
3507 {
3508         struct driver_data *dd = set->driver_data;
3509         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3510 
3511         if (!cmd->command)
3512                 return;
3513 
3514         dma_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ, cmd->command,
3515                           cmd->command_dma);
3516 }
3517 
3518 static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
3519                          unsigned int hctx_idx, unsigned int numa_node)
3520 {
3521         struct driver_data *dd = set->driver_data;
3522         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3523 
3524         cmd->command = dma_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3525                         &cmd->command_dma, GFP_KERNEL);
3526         if (!cmd->command)
3527                 return -ENOMEM;
3528 
3529         sg_init_table(cmd->sg, MTIP_MAX_SG);
3530         return 0;
3531 }
3532 
3533 static enum blk_eh_timer_return mtip_cmd_timeout(struct request *req,
3534                                                                 bool reserved)
3535 {
3536         struct driver_data *dd = req->q->queuedata;
3537 
3538         if (reserved) {
3539                 struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
3540 
3541                 cmd->status = BLK_STS_TIMEOUT;
3542                 blk_mq_complete_request(req);
3543                 return BLK_EH_DONE;
3544         }
3545 
3546         if (test_bit(req->tag, dd->port->cmds_to_issue))
3547                 goto exit_handler;
3548 
3549         if (test_and_set_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags))
3550                 goto exit_handler;
3551 
3552         wake_up_interruptible(&dd->port->svc_wait);
3553 exit_handler:
3554         return BLK_EH_RESET_TIMER;
3555 }
3556 
3557 static const struct blk_mq_ops mtip_mq_ops = {
3558         .queue_rq       = mtip_queue_rq,
3559         .init_request   = mtip_init_cmd,
3560         .exit_request   = mtip_free_cmd,
3561         .complete       = mtip_softirq_done_fn,
3562         .timeout        = mtip_cmd_timeout,
3563 };
3564 
3565 /*
3566  * Block layer initialization function.
3567  *
3568  * This function is called once by the PCI layer for each P320
3569  * device that is connected to the system.
3570  *
3571  * @dd Pointer to the driver data structure.
3572  *
3573  * return value
3574  *      0 on success else an error code.
3575  */
3576 static int mtip_block_initialize(struct driver_data *dd)
3577 {
3578         int rv = 0, wait_for_rebuild = 0;
3579         sector_t capacity;
3580         unsigned int index = 0;
3581         struct kobject *kobj;
3582 
3583         if (dd->disk)
3584                 goto skip_create_disk; /* hw init done, before rebuild */
3585 
3586         if (mtip_hw_init(dd)) {
3587                 rv = -EINVAL;
3588                 goto protocol_init_error;
3589         }
3590 
3591         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3592         if (dd->disk  == NULL) {
3593                 dev_err(&dd->pdev->dev,
3594                         "Unable to allocate gendisk structure\n");
3595                 rv = -EINVAL;
3596                 goto alloc_disk_error;
3597         }
3598 
3599         rv = ida_alloc(&rssd_index_ida, GFP_KERNEL);
3600         if (rv < 0)
3601                 goto ida_get_error;
3602         index = rv;
3603 
3604         rv = rssd_disk_name_format("rssd",
3605                                 index,
3606                                 dd->disk->disk_name,
3607                                 DISK_NAME_LEN);
3608         if (rv)
3609                 goto disk_index_error;
3610 
3611         dd->disk->major         = dd->major;
3612         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3613         dd->disk->minors        = MTIP_MAX_MINORS;
3614         dd->disk->fops          = &mtip_block_ops;
3615         dd->disk->private_data  = dd;
3616         dd->index               = index;
3617 
3618         mtip_hw_debugfs_init(dd);
3619 
3620         memset(&dd->tags, 0, sizeof(dd->tags));
3621         dd->tags.ops = &mtip_mq_ops;
3622         dd->tags.nr_hw_queues = 1;
3623         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3624         dd->tags.reserved_tags = 1;
3625         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3626         dd->tags.numa_node = dd->numa_node;
3627         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3628         dd->tags.driver_data = dd;
3629         dd->tags.timeout = MTIP_NCQ_CMD_TIMEOUT_MS;
3630 
3631         rv = blk_mq_alloc_tag_set(&dd->tags);
3632         if (rv) {
3633                 dev_err(&dd->pdev->dev,
3634                         "Unable to allocate request queue\n");
3635                 goto block_queue_alloc_tag_error;
3636         }
3637 
3638         /* Allocate the request queue. */
3639         dd->queue = blk_mq_init_queue(&dd->tags);
3640         if (IS_ERR(dd->queue)) {
3641                 dev_err(&dd->pdev->dev,
3642                         "Unable to allocate request queue\n");
3643                 rv = -ENOMEM;
3644                 goto block_queue_alloc_init_error;
3645         }
3646 
3647         dd->disk->queue         = dd->queue;
3648         dd->queue->queuedata    = dd;
3649 
3650 skip_create_disk:
3651         /* Initialize the protocol layer. */
3652         wait_for_rebuild = mtip_hw_get_identify(dd);
3653         if (wait_for_rebuild < 0) {
3654                 dev_err(&dd->pdev->dev,
3655                         "Protocol layer initialization failed\n");
3656                 rv = -EINVAL;
3657                 goto init_hw_cmds_error;
3658         }
3659 
3660         /*
3661          * if rebuild pending, start the service thread, and delay the block
3662          * queue creation and device_add_disk()
3663          */
3664         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3665                 goto start_service_thread;
3666 
3667         /* Set device limits. */
3668         blk_queue_flag_set(QUEUE_FLAG_NONROT, dd->queue);
3669         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, dd->queue);
3670         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3671         blk_queue_physical_block_size(dd->queue, 4096);
3672         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3673         blk_queue_max_segment_size(dd->queue, 0x400000);
3674         dma_set_max_seg_size(&dd->pdev->dev, 0x400000);
3675         blk_queue_io_min(dd->queue, 4096);
3676 
3677         /* Set the capacity of the device in 512 byte sectors. */
3678         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3679                 dev_warn(&dd->pdev->dev,
3680                         "Could not read drive capacity\n");
3681                 rv = -EIO;
3682                 goto read_capacity_error;
3683         }
3684         set_capacity(dd->disk, capacity);
3685 
3686         /* Enable the block device and add it to /dev */
3687         device_add_disk(&dd->pdev->dev, dd->disk, NULL);
3688 
3689         dd->bdev = bdget_disk(dd->disk, 0);
3690         /*
3691          * Now that the disk is active, initialize any sysfs attributes
3692          * managed by the protocol layer.
3693          */
3694         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3695         if (kobj) {
3696                 mtip_hw_sysfs_init(dd, kobj);
3697                 kobject_put(kobj);
3698         }
3699 
3700         if (dd->mtip_svc_handler) {
3701                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3702                 return rv; /* service thread created for handling rebuild */
3703         }
3704 
3705 start_service_thread:
3706         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
3707                                                 dd, dd->numa_node,
3708                                                 "mtip_svc_thd_%02d", index);
3709 
3710         if (IS_ERR(dd->mtip_svc_handler)) {
3711                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3712                 dd->mtip_svc_handler = NULL;
3713                 rv = -EFAULT;
3714                 goto kthread_run_error;
3715         }
3716         wake_up_process(dd->mtip_svc_handler);
3717         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3718                 rv = wait_for_rebuild;
3719 
3720         return rv;
3721 
3722 kthread_run_error:
3723         bdput(dd->bdev);
3724         dd->bdev = NULL;
3725 
3726         /* Delete our gendisk. This also removes the device from /dev */
3727         del_gendisk(dd->disk);
3728 
3729 read_capacity_error:
3730 init_hw_cmds_error:
3731         blk_cleanup_queue(dd->queue);
3732 block_queue_alloc_init_error:
3733         blk_mq_free_tag_set(&dd->tags);
3734 block_queue_alloc_tag_error:
3735         mtip_hw_debugfs_exit(dd);
3736 disk_index_error:
3737         ida_free(&rssd_index_ida, index);
3738 
3739 ida_get_error:
3740         put_disk(dd->disk);
3741 
3742 alloc_disk_error:
3743         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3744 
3745 protocol_init_error:
3746         return rv;
3747 }
3748 
3749 static bool mtip_no_dev_cleanup(struct request *rq, void *data, bool reserv)
3750 {
3751         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3752 
3753         cmd->status = BLK_STS_IOERR;
3754         blk_mq_complete_request(rq);
3755         return true;
3756 }
3757 
3758 /*
3759  * Block layer deinitialization function.
3760  *
3761  * Called by the PCI layer as each P320 device is removed.
3762  *
3763  * @dd Pointer to the driver data structure.
3764  *
3765  * return value
3766  *      0
3767  */
3768 static int mtip_block_remove(struct driver_data *dd)
3769 {
3770         struct kobject *kobj;
3771 
3772         mtip_hw_debugfs_exit(dd);
3773 
3774         if (dd->mtip_svc_handler) {
3775                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3776                 wake_up_interruptible(&dd->port->svc_wait);
3777                 kthread_stop(dd->mtip_svc_handler);
3778         }
3779 
3780         /* Clean up the sysfs attributes, if created */
3781         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
3782                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3783                 if (kobj) {
3784                         mtip_hw_sysfs_exit(dd, kobj);
3785                         kobject_put(kobj);
3786                 }
3787         }
3788 
3789         if (!dd->sr) {
3790                 /*
3791                  * Explicitly wait here for IOs to quiesce,
3792                  * as mtip_standby_drive usually won't wait for IOs.
3793                  */
3794                 if (!mtip_quiesce_io(dd->port, MTIP_QUIESCE_IO_TIMEOUT_MS))
3795                         mtip_standby_drive(dd);
3796         }
3797         else
3798                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
3799                                                 dd->disk->disk_name);
3800 
3801         blk_freeze_queue_start(dd->queue);
3802         blk_mq_quiesce_queue(dd->queue);
3803         blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);
3804         blk_mq_unquiesce_queue(dd->queue);
3805 
3806         /*
3807          * Delete our gendisk structure. This also removes the device
3808          * from /dev
3809          */
3810         if (dd->bdev) {
3811                 bdput(dd->bdev);
3812                 dd->bdev = NULL;
3813         }
3814         if (dd->disk) {
3815                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3816                         del_gendisk(dd->disk);
3817                 if (dd->disk->queue) {
3818                         blk_cleanup_queue(dd->queue);
3819                         blk_mq_free_tag_set(&dd->tags);
3820                         dd->queue = NULL;
3821                 }
3822                 put_disk(dd->disk);
3823         }
3824         dd->disk  = NULL;
3825 
3826         ida_free(&rssd_index_ida, dd->index);
3827 
3828         /* De-initialize the protocol layer. */
3829         mtip_hw_exit(dd);
3830 
3831         return 0;
3832 }
3833 
3834 /*
3835  * Function called by the PCI layer when just before the
3836  * machine shuts down.
3837  *
3838  * If a protocol layer shutdown function is present it will be called
3839  * by this function.
3840  *
3841  * @dd Pointer to the driver data structure.
3842  *
3843  * return value
3844  *      0
3845  */
3846 static int mtip_block_shutdown(struct driver_data *dd)
3847 {
3848         mtip_hw_shutdown(dd);
3849 
3850         /* Delete our gendisk structure, and cleanup the blk queue. */
3851         if (dd->disk) {
3852                 dev_info(&dd->pdev->dev,
3853                         "Shutting down %s ...\n", dd->disk->disk_name);
3854 
3855                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3856                         del_gendisk(dd->disk);
3857                 if (dd->disk->queue) {
3858                         blk_cleanup_queue(dd->queue);
3859                         blk_mq_free_tag_set(&dd->tags);
3860                 }
3861                 put_disk(dd->disk);
3862                 dd->disk  = NULL;
3863                 dd->queue = NULL;
3864         }
3865 
3866         ida_free(&rssd_index_ida, dd->index);
3867         return 0;
3868 }
3869 
3870 static int mtip_block_suspend(struct driver_data *dd)
3871 {
3872         dev_info(&dd->pdev->dev,
3873                 "Suspending %s ...\n", dd->disk->disk_name);
3874         mtip_hw_suspend(dd);
3875         return 0;
3876 }
3877 
3878 static int mtip_block_resume(struct driver_data *dd)
3879 {
3880         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
3881                 dd->disk->disk_name);
3882         mtip_hw_resume(dd);
3883         return 0;
3884 }
3885 
3886 static void drop_cpu(int cpu)
3887 {
3888         cpu_use[cpu]--;
3889 }
3890 
3891 static int get_least_used_cpu_on_node(int node)
3892 {
3893         int cpu, least_used_cpu, least_cnt;
3894         const struct cpumask *node_mask;
3895 
3896         node_mask = cpumask_of_node(node);
3897         least_used_cpu = cpumask_first(node_mask);
3898         least_cnt = cpu_use[least_used_cpu];
3899         cpu = least_used_cpu;
3900 
3901         for_each_cpu(cpu, node_mask) {
3902                 if (cpu_use[cpu] < least_cnt) {
3903                         least_used_cpu = cpu;
3904                         least_cnt = cpu_use[cpu];
3905                 }
3906         }
3907         cpu_use[least_used_cpu]++;
3908         return least_used_cpu;
3909 }
3910 
3911 /* Helper for selecting a node in round robin mode */
3912 static inline int mtip_get_next_rr_node(void)
3913 {
3914         static int next_node = NUMA_NO_NODE;
3915 
3916         if (next_node == NUMA_NO_NODE) {
3917                 next_node = first_online_node;
3918                 return next_node;
3919         }
3920 
3921         next_node = next_online_node(next_node);
3922         if (next_node == MAX_NUMNODES)
3923                 next_node = first_online_node;
3924         return next_node;
3925 }
3926 
3927 static DEFINE_HANDLER(0);
3928 static DEFINE_HANDLER(1);
3929 static DEFINE_HANDLER(2);
3930 static DEFINE_HANDLER(3);
3931 static DEFINE_HANDLER(4);
3932 static DEFINE_HANDLER(5);
3933 static DEFINE_HANDLER(6);
3934 static DEFINE_HANDLER(7);
3935 
3936 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
3937 {
3938         int pos;
3939         unsigned short pcie_dev_ctrl;
3940 
3941         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
3942         if (pos) {
3943                 pci_read_config_word(pdev,
3944                         pos + PCI_EXP_DEVCTL,
3945                         &pcie_dev_ctrl);
3946                 if (pcie_dev_ctrl & (1 << 11) ||
3947                     pcie_dev_ctrl & (1 << 4)) {
3948                         dev_info(&dd->pdev->dev,
3949                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
3950                                         pdev->vendor, pdev->device);
3951                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
3952                                                 PCI_EXP_DEVCTL_RELAX_EN);
3953                         pci_write_config_word(pdev,
3954                                 pos + PCI_EXP_DEVCTL,
3955                                 pcie_dev_ctrl);
3956                 }
3957         }
3958 }
3959 
3960 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
3961 {
3962         /*
3963          * This workaround is specific to AMD/ATI chipset with a PCI upstream
3964          * device with device id 0x5aXX
3965          */
3966         if (pdev->bus && pdev->bus->self) {
3967                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
3968                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
3969                         mtip_disable_link_opts(dd, pdev->bus->self);
3970                 } else {
3971                         /* Check further up the topology */
3972                         struct pci_dev *parent_dev = pdev->bus->self;
3973                         if (parent_dev->bus &&
3974                                 parent_dev->bus->parent &&
3975                                 parent_dev->bus->parent->self &&
3976                                 parent_dev->bus->parent->self->vendor ==
3977                                          PCI_VENDOR_ID_ATI &&
3978                                 (parent_dev->bus->parent->self->device &
3979                                         0xff00) == 0x5a00) {
3980                                 mtip_disable_link_opts(dd,
3981                                         parent_dev->bus->parent->self);
3982                         }
3983                 }
3984         }
3985 }
3986 
3987 /*
3988  * Called for each supported PCI device detected.
3989  *
3990  * This function allocates the private data structure, enables the
3991  * PCI device and then calls the block layer initialization function.
3992  *
3993  * return value
3994  *      0 on success else an error code.
3995  */
3996 static int mtip_pci_probe(struct pci_dev *pdev,
3997                         const struct pci_device_id *ent)
3998 {
3999         int rv = 0;
4000         struct driver_data *dd = NULL;
4001         char cpu_list[256];
4002         const struct cpumask *node_mask;
4003         int cpu, i = 0, j = 0;
4004         int my_node = NUMA_NO_NODE;
4005         unsigned long flags;
4006 
4007         /* Allocate memory for this devices private data. */
4008         my_node = pcibus_to_node(pdev->bus);
4009         if (my_node != NUMA_NO_NODE) {
4010                 if (!node_online(my_node))
4011                         my_node = mtip_get_next_rr_node();
4012         } else {
4013                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4014                 my_node = mtip_get_next_rr_node();
4015         }
4016         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4017                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4018                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
4019 
4020         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4021         if (dd == NULL) {
4022                 dev_err(&pdev->dev,
4023                         "Unable to allocate memory for driver data\n");
4024                 return -ENOMEM;
4025         }
4026 
4027         /* Attach the private data to this PCI device.  */
4028         pci_set_drvdata(pdev, dd);
4029 
4030         rv = pcim_enable_device(pdev);
4031         if (rv < 0) {
4032                 dev_err(&pdev->dev, "Unable to enable device\n");
4033                 goto iomap_err;
4034         }
4035 
4036         /* Map BAR5 to memory. */
4037         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4038         if (rv < 0) {
4039                 dev_err(&pdev->dev, "Unable to map regions\n");
4040                 goto iomap_err;
4041         }
4042 
4043         rv = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
4044         if (rv) {
4045                 dev_warn(&pdev->dev, "64-bit DMA enable failed\n");
4046                 goto setmask_err;
4047         }
4048 
4049         /* Copy the info we may need later into the private data structure. */
4050         dd->major       = mtip_major;
4051         dd->instance    = instance;
4052         dd->pdev        = pdev;
4053         dd->numa_node   = my_node;
4054 
4055         INIT_LIST_HEAD(&dd->online_list);
4056         INIT_LIST_HEAD(&dd->remove_list);
4057 
4058         memset(dd->workq_name, 0, 32);
4059         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4060 
4061         dd->isr_workq = create_workqueue(dd->workq_name);
4062         if (!dd->isr_workq) {
4063                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4064                 rv = -ENOMEM;
4065                 goto setmask_err;
4066         }
4067 
4068         memset(cpu_list, 0, sizeof(cpu_list));
4069 
4070         node_mask = cpumask_of_node(dd->numa_node);
4071         if (!cpumask_empty(node_mask)) {
4072                 for_each_cpu(cpu, node_mask)
4073                 {
4074                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4075                         j = strlen(cpu_list);
4076                 }
4077 
4078                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4079                         dd->numa_node,
4080                         topology_physical_package_id(cpumask_first(node_mask)),
4081                         nr_cpus_node(dd->numa_node),
4082                         cpu_list);
4083         } else
4084                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4085 
4086         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4087         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4088                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4089 
4090         /* first worker context always runs in ISR */
4091         dd->work[0].cpu_binding = dd->isr_binding;
4092         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4093         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4094         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4095         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4096         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4097         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4098         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4099 
4100         /* Log the bindings */
4101         for_each_present_cpu(cpu) {
4102                 memset(cpu_list, 0, sizeof(cpu_list));
4103                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4104                         if (dd->work[i].cpu_binding == cpu) {
4105                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4106                                 j = strlen(cpu_list);
4107                         }
4108                 }
4109                 if (j)
4110                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4111         }
4112 
4113         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4114         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4115         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4116         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4117         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4118         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4119         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4120         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4121 
4122         pci_set_master(pdev);
4123         rv = pci_enable_msi(pdev);
4124         if (rv) {
4125                 dev_warn(&pdev->dev,
4126                         "Unable to enable MSI interrupt.\n");
4127                 goto msi_initialize_err;
4128         }
4129 
4130         mtip_fix_ero_nosnoop(dd, pdev);
4131 
4132         /* Initialize the block layer. */
4133         rv = mtip_block_initialize(dd);
4134         if (rv < 0) {
4135                 dev_err(&pdev->dev,
4136                         "Unable to initialize block layer\n");
4137                 goto block_initialize_err;
4138         }
4139 
4140         /*
4141          * Increment the instance count so that each device has a unique
4142          * instance number.
4143          */
4144         instance++;
4145         if (rv != MTIP_FTL_REBUILD_MAGIC)
4146                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4147         else
4148                 rv = 0; /* device in rebuild state, return 0 from probe */
4149 
4150         /* Add to online list even if in ftl rebuild */
4151         spin_lock_irqsave(&dev_lock, flags);
4152         list_add(&dd->online_list, &online_list);
4153         spin_unlock_irqrestore(&dev_lock, flags);
4154 
4155         goto done;
4156 
4157 block_initialize_err:
4158         pci_disable_msi(pdev);
4159 
4160 msi_initialize_err:
4161         if (dd->isr_workq) {
4162                 flush_workqueue(dd->isr_workq);
4163                 destroy_workqueue(dd->isr_workq);
4164                 drop_cpu(dd->work[0].cpu_binding);
4165                 drop_cpu(dd->work[1].cpu_binding);
4166                 drop_cpu(dd->work[2].cpu_binding);
4167         }
4168 setmask_err:
4169         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4170 
4171 iomap_err:
4172         kfree(dd);
4173         pci_set_drvdata(pdev, NULL);
4174         return rv;
4175 done:
4176         return rv;
4177 }
4178 
4179 /*
4180  * Called for each probed device when the device is removed or the
4181  * driver is unloaded.
4182  *
4183  * return value
4184  *      None
4185  */
4186 static void mtip_pci_remove(struct pci_dev *pdev)
4187 {
4188         struct driver_data *dd = pci_get_drvdata(pdev);
4189         unsigned long flags, to;
4190 
4191         set_bit(MTIP_DDF_REMOVAL_BIT, &dd->dd_flag);
4192 
4193         spin_lock_irqsave(&dev_lock, flags);
4194         list_del_init(&dd->online_list);
4195         list_add(&dd->remove_list, &removing_list);
4196         spin_unlock_irqrestore(&dev_lock, flags);
4197 
4198         mtip_check_surprise_removal(pdev);
4199         synchronize_irq(dd->pdev->irq);
4200 
4201         /* Spin until workers are done */
4202         to = jiffies + msecs_to_jiffies(4000);
4203         do {
4204                 msleep(20);
4205         } while (atomic_read(&dd->irq_workers_active) != 0 &&
4206                 time_before(jiffies, to));
4207 
4208         if (!dd->sr)
4209                 fsync_bdev(dd->bdev);
4210 
4211         if (atomic_read(&dd->irq_workers_active) != 0) {
4212                 dev_warn(&dd->pdev->dev,
4213                         "Completion workers still active!\n");
4214         }
4215 
4216         blk_set_queue_dying(dd->queue);
4217         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4218 
4219         /* Clean up the block layer. */
4220         mtip_block_remove(dd);
4221 
4222         if (dd->isr_workq) {
4223                 flush_workqueue(dd->isr_workq);
4224                 destroy_workqueue(dd->isr_workq);
4225                 drop_cpu(dd->work[0].cpu_binding);
4226                 drop_cpu(dd->work[1].cpu_binding);
4227                 drop_cpu(dd->work[2].cpu_binding);
4228         }
4229 
4230         pci_disable_msi(pdev);
4231 
4232         spin_lock_irqsave(&dev_lock, flags);
4233         list_del_init(&dd->remove_list);
4234         spin_unlock_irqrestore(&dev_lock, flags);
4235 
4236         kfree(dd);
4237 
4238         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4239         pci_set_drvdata(pdev, NULL);
4240 }
4241 
4242 /*
4243  * Called for each probed device when the device is suspended.
4244  *
4245  * return value
4246  *      0  Success
4247  *      <0 Error
4248  */
4249 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4250 {
4251         int rv = 0;
4252         struct driver_data *dd = pci_get_drvdata(pdev);
4253 
4254         if (!dd) {
4255                 dev_err(&pdev->dev,
4256                         "Driver private datastructure is NULL\n");
4257                 return -EFAULT;
4258         }
4259 
4260         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4261 
4262         /* Disable ports & interrupts then send standby immediate */
4263         rv = mtip_block_suspend(dd);
4264         if (rv < 0) {
4265                 dev_err(&pdev->dev,
4266                         "Failed to suspend controller\n");
4267                 return rv;
4268         }
4269 
4270         /*
4271          * Save the pci config space to pdev structure &
4272          * disable the device
4273          */
4274         pci_save_state(pdev);
4275         pci_disable_device(pdev);
4276 
4277         /* Move to Low power state*/
4278         pci_set_power_state(pdev, PCI_D3hot);
4279 
4280         return rv;
4281 }
4282 
4283 /*
4284  * Called for each probed device when the device is resumed.
4285  *
4286  * return value
4287  *      0  Success
4288  *      <0 Error
4289  */
4290 static int mtip_pci_resume(struct pci_dev *pdev)
4291 {
4292         int rv = 0;
4293         struct driver_data *dd;
4294 
4295         dd = pci_get_drvdata(pdev);
4296         if (!dd) {
4297                 dev_err(&pdev->dev,
4298                         "Driver private datastructure is NULL\n");
4299                 return -EFAULT;
4300         }
4301 
4302         /* Move the device to active State */
4303         pci_set_power_state(pdev, PCI_D0);
4304 
4305         /* Restore PCI configuration space */
4306         pci_restore_state(pdev);
4307 
4308         /* Enable the PCI device*/
4309         rv = pcim_enable_device(pdev);
4310         if (rv < 0) {
4311                 dev_err(&pdev->dev,
4312                         "Failed to enable card during resume\n");
4313                 goto err;
4314         }
4315         pci_set_master(pdev);
4316 
4317         /*
4318          * Calls hbaReset, initPort, & startPort function
4319          * then enables interrupts
4320          */
4321         rv = mtip_block_resume(dd);
4322         if (rv < 0)
4323                 dev_err(&pdev->dev, "Unable to resume\n");
4324 
4325 err:
4326         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4327 
4328         return rv;
4329 }
4330 
4331 /*
4332  * Shutdown routine
4333  *
4334  * return value
4335  *      None
4336  */
4337 static void mtip_pci_shutdown(struct pci_dev *pdev)
4338 {
4339         struct driver_data *dd = pci_get_drvdata(pdev);
4340         if (dd)
4341                 mtip_block_shutdown(dd);
4342 }
4343 
4344 /* Table of device ids supported by this driver. */
4345 static const struct pci_device_id mtip_pci_tbl[] = {
4346         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4347         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4348         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4349         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4350         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4351         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4352         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4353         { 0 }
4354 };
4355 
4356 /* Structure that describes the PCI driver functions. */
4357 static struct pci_driver mtip_pci_driver = {
4358         .name                   = MTIP_DRV_NAME,
4359         .id_table               = mtip_pci_tbl,
4360         .probe                  = mtip_pci_probe,
4361         .remove                 = mtip_pci_remove,
4362         .suspend                = mtip_pci_suspend,
4363         .resume                 = mtip_pci_resume,
4364         .shutdown               = mtip_pci_shutdown,
4365 };
4366 
4367 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4368 
4369 /*
4370  * Module initialization function.
4371  *
4372  * Called once when the module is loaded. This function allocates a major
4373  * block device number to the Cyclone devices and registers the PCI layer
4374  * of the driver.
4375  *
4376  * Return value
4377  *      0 on success else error code.
4378  */
4379 static int __init mtip_init(void)
4380 {
4381         int error;
4382 
4383         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4384 
4385         spin_lock_init(&dev_lock);
4386 
4387         INIT_LIST_HEAD(&online_list);
4388         INIT_LIST_HEAD(&removing_list);
4389 
4390         /* Allocate a major block device number to use with this driver. */
4391         error = register_blkdev(0, MTIP_DRV_NAME);
4392         if (error <= 0) {
4393                 pr_err("Unable to register block device (%d)\n",
4394                 error);
4395                 return -EBUSY;
4396         }
4397         mtip_major = error;
4398 
4399         dfs_parent = debugfs_create_dir("rssd", NULL);
4400         if (IS_ERR_OR_NULL(dfs_parent)) {
4401                 pr_warn("Error creating debugfs parent\n");
4402                 dfs_parent = NULL;
4403         }
4404         if (dfs_parent) {
4405                 dfs_device_status = debugfs_create_file("device_status",
4406                                         0444, dfs_parent, NULL,
4407                                         &mtip_device_status_fops);
4408                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4409                         pr_err("Error creating device_status node\n");
4410                         dfs_device_status = NULL;
4411                 }
4412         }
4413 
4414         /* Register our PCI operations. */
4415         error = pci_register_driver(&mtip_pci_driver);
4416         if (error) {
4417                 debugfs_remove(dfs_parent);
4418                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4419         }
4420 
4421         return error;
4422 }
4423 
4424 /*
4425  * Module de-initialization function.
4426  *
4427  * Called once when the module is unloaded. This function deallocates
4428  * the major block device number allocated by mtip_init() and
4429  * unregisters the PCI layer of the driver.
4430  *
4431  * Return value
4432  *      none
4433  */
4434 static void __exit mtip_exit(void)
4435 {
4436         /* Release the allocated major block device number. */
4437         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4438 
4439         /* Unregister the PCI driver. */
4440         pci_unregister_driver(&mtip_pci_driver);
4441 
4442         debugfs_remove_recursive(dfs_parent);
4443 }
4444 
4445 MODULE_AUTHOR("Micron Technology, Inc");
4446 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4447 MODULE_LICENSE("GPL");
4448 MODULE_VERSION(MTIP_DRV_VERSION);
4449 
4450 module_init(mtip_init);
4451 module_exit(mtip_exit);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/block/mtip32xx/mtip32xx.c

DEFINITIONS
