drivers/ata/libata-acpi.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ata_acpi_clear_gtf
ata_dev_acpi_handle
ata_acpi_detach_device
ata_acpi_handle_hotplug
ata_acpi_dev_notify_dock
ata_acpi_ap_notify_dock
ata_acpi_uevent
ata_acpi_ap_uevent
ata_acpi_dev_uevent
ata_acpi_bind_port
ata_acpi_bind_dev
ata_acpi_dissociate
ata_acpi_gtm
ata_acpi_stm
ata_dev_get_GTF
ata_acpi_gtm_xfermask
ata_acpi_cbl_80wire
ata_acpi_gtf_to_tf
ata_acpi_filter_tf
ata_acpi_run_tf
ata_acpi_exec_tfs
ata_acpi_push_id
ata_acpi_on_suspend
ata_acpi_on_resume
ata_acpi_choose_suspend_state
sata_acpi_set_state
pata_acpi_set_state
ata_acpi_set_state
ata_acpi_on_devcfg
ata_acpi_on_disable
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * libata-acpi.c
   4  * Provides ACPI support for PATA/SATA.
   5  *
   6  * Copyright (C) 2006 Intel Corp.
   7  * Copyright (C) 2006 Randy Dunlap
   8  */
   9 
  10 #include <linux/module.h>
  11 #include <linux/ata.h>
  12 #include <linux/delay.h>
  13 #include <linux/device.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/acpi.h>
  17 #include <linux/libata.h>
  18 #include <linux/pci.h>
  19 #include <linux/slab.h>
  20 #include <linux/pm_runtime.h>
  21 #include <scsi/scsi_device.h>
  22 #include "libata.h"
  23 
  24 unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;
  25 module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);
  26 MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock, 0x4=DIPM, 0x8=FPDMA non-zero offset, 0x10=FPDMA DMA Setup FIS auto-activate)");
  27 
  28 #define NO_PORT_MULT            0xffff
  29 #define SATA_ADR(root, pmp)     (((root) << 16) | (pmp))
  30 
  31 #define REGS_PER_GTF            7
  32 struct ata_acpi_gtf {
  33         u8      tf[REGS_PER_GTF];       /* regs. 0x1f1 - 0x1f7 */
  34 } __packed;
  35 
  36 static void ata_acpi_clear_gtf(struct ata_device *dev)
  37 {
  38         kfree(dev->gtf_cache);
  39         dev->gtf_cache = NULL;
  40 }
  41 
  42 struct ata_acpi_hotplug_context {
  43         struct acpi_hotplug_context hp;
  44         union {
  45                 struct ata_port *ap;
  46                 struct ata_device *dev;
  47         } data;
  48 };
  49 
  50 #define ata_hotplug_data(context) (container_of((context), struct ata_acpi_hotplug_context, hp)->data)
  51 
  52 /**
  53  * ata_dev_acpi_handle - provide the acpi_handle for an ata_device
  54  * @dev: the acpi_handle returned will correspond to this device
  55  *
  56  * Returns the acpi_handle for the ACPI namespace object corresponding to
  57  * the ata_device passed into the function, or NULL if no such object exists
  58  * or ACPI is disabled for this device due to consecutive errors.
  59  */
  60 acpi_handle ata_dev_acpi_handle(struct ata_device *dev)
  61 {
  62         return dev->flags & ATA_DFLAG_ACPI_DISABLED ?
  63                         NULL : ACPI_HANDLE(&dev->tdev);
  64 }
  65 
  66 /* @ap and @dev are the same as ata_acpi_handle_hotplug() */
  67 static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
  68 {
  69         if (dev)
  70                 dev->flags |= ATA_DFLAG_DETACH;
  71         else {
  72                 struct ata_link *tlink;
  73                 struct ata_device *tdev;
  74 
  75                 ata_for_each_link(tlink, ap, EDGE)
  76                         ata_for_each_dev(tdev, tlink, ALL)
  77                                 tdev->flags |= ATA_DFLAG_DETACH;
  78         }
  79 
  80         ata_port_schedule_eh(ap);
  81 }
  82 
  83 /**
  84  * ata_acpi_handle_hotplug - ACPI event handler backend
  85  * @ap: ATA port ACPI event occurred
  86  * @dev: ATA device ACPI event occurred (can be NULL)
  87  * @event: ACPI event which occurred
  88  *
  89  * All ACPI bay / device realted events end up in this function.  If
  90  * the event is port-wide @dev is NULL.  If the event is specific to a
  91  * device, @dev points to it.
  92  *
  93  * Hotplug (as opposed to unplug) notification is always handled as
  94  * port-wide while unplug only kills the target device on device-wide
  95  * event.
  96  *
  97  * LOCKING:
  98  * ACPI notify handler context.  May sleep.
  99  */
 100 static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
 101                                     u32 event)
 102 {
 103         struct ata_eh_info *ehi = &ap->link.eh_info;
 104         int wait = 0;
 105         unsigned long flags;
 106 
 107         spin_lock_irqsave(ap->lock, flags);
 108         /*
 109          * When dock driver calls into the routine, it will always use
 110          * ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
 111          * ACPI_NOTIFY_EJECT_REQUEST for remove
 112          */
 113         switch (event) {
 114         case ACPI_NOTIFY_BUS_CHECK:
 115         case ACPI_NOTIFY_DEVICE_CHECK:
 116                 ata_ehi_push_desc(ehi, "ACPI event");
 117 
 118                 ata_ehi_hotplugged(ehi);
 119                 ata_port_freeze(ap);
 120                 break;
 121         case ACPI_NOTIFY_EJECT_REQUEST:
 122                 ata_ehi_push_desc(ehi, "ACPI event");
 123 
 124                 ata_acpi_detach_device(ap, dev);
 125                 wait = 1;
 126                 break;
 127         }
 128 
 129         spin_unlock_irqrestore(ap->lock, flags);
 130 
 131         if (wait)
 132                 ata_port_wait_eh(ap);
 133 }
 134 
 135 static int ata_acpi_dev_notify_dock(struct acpi_device *adev, u32 event)
 136 {
 137         struct ata_device *dev = ata_hotplug_data(adev->hp).dev;
 138         ata_acpi_handle_hotplug(dev->link->ap, dev, event);
 139         return 0;
 140 }
 141 
 142 static int ata_acpi_ap_notify_dock(struct acpi_device *adev, u32 event)
 143 {
 144         ata_acpi_handle_hotplug(ata_hotplug_data(adev->hp).ap, NULL, event);
 145         return 0;
 146 }
 147 
 148 static void ata_acpi_uevent(struct ata_port *ap, struct ata_device *dev,
 149         u32 event)
 150 {
 151         struct kobject *kobj = NULL;
 152         char event_string[20];
 153         char *envp[] = { event_string, NULL };
 154 
 155         if (dev) {
 156                 if (dev->sdev)
 157                         kobj = &dev->sdev->sdev_gendev.kobj;
 158         } else
 159                 kobj = &ap->dev->kobj;
 160 
 161         if (kobj) {
 162                 snprintf(event_string, 20, "BAY_EVENT=%d", event);
 163                 kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
 164         }
 165 }
 166 
 167 static void ata_acpi_ap_uevent(struct acpi_device *adev, u32 event)
 168 {
 169         ata_acpi_uevent(ata_hotplug_data(adev->hp).ap, NULL, event);
 170 }
 171 
 172 static void ata_acpi_dev_uevent(struct acpi_device *adev, u32 event)
 173 {
 174         struct ata_device *dev = ata_hotplug_data(adev->hp).dev;
 175         ata_acpi_uevent(dev->link->ap, dev, event);
 176 }
 177 
 178 /* bind acpi handle to pata port */
 179 void ata_acpi_bind_port(struct ata_port *ap)
 180 {
 181         struct acpi_device *host_companion = ACPI_COMPANION(ap->host->dev);
 182         struct acpi_device *adev;
 183         struct ata_acpi_hotplug_context *context;
 184 
 185         if (libata_noacpi || ap->flags & ATA_FLAG_ACPI_SATA || !host_companion)
 186                 return;
 187 
 188         acpi_preset_companion(&ap->tdev, host_companion, ap->port_no);
 189 
 190         if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
 191                 ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
 192 
 193         adev = ACPI_COMPANION(&ap->tdev);
 194         if (!adev || adev->hp)
 195                 return;
 196 
 197         context = kzalloc(sizeof(*context), GFP_KERNEL);
 198         if (!context)
 199                 return;
 200 
 201         context->data.ap = ap;
 202         acpi_initialize_hp_context(adev, &context->hp, ata_acpi_ap_notify_dock,
 203                                    ata_acpi_ap_uevent);
 204 }
 205 
 206 void ata_acpi_bind_dev(struct ata_device *dev)
 207 {
 208         struct ata_port *ap = dev->link->ap;
 209         struct acpi_device *port_companion = ACPI_COMPANION(&ap->tdev);
 210         struct acpi_device *host_companion = ACPI_COMPANION(ap->host->dev);
 211         struct acpi_device *parent, *adev;
 212         struct ata_acpi_hotplug_context *context;
 213         u64 adr;
 214 
 215         /*
 216          * For both sata/pata devices, host companion device is required.
 217          * For pata device, port companion device is also required.
 218          */
 219         if (libata_noacpi || !host_companion ||
 220                         (!(ap->flags & ATA_FLAG_ACPI_SATA) && !port_companion))
 221                 return;
 222 
 223         if (ap->flags & ATA_FLAG_ACPI_SATA) {
 224                 if (!sata_pmp_attached(ap))
 225                         adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
 226                 else
 227                         adr = SATA_ADR(ap->port_no, dev->link->pmp);
 228                 parent = host_companion;
 229         } else {
 230                 adr = dev->devno;
 231                 parent = port_companion;
 232         }
 233 
 234         acpi_preset_companion(&dev->tdev, parent, adr);
 235         adev = ACPI_COMPANION(&dev->tdev);
 236         if (!adev || adev->hp)
 237                 return;
 238 
 239         context = kzalloc(sizeof(*context), GFP_KERNEL);
 240         if (!context)
 241                 return;
 242 
 243         context->data.dev = dev;
 244         acpi_initialize_hp_context(adev, &context->hp, ata_acpi_dev_notify_dock,
 245                                    ata_acpi_dev_uevent);
 246 }
 247 
 248 /**
 249  * ata_acpi_dissociate - dissociate ATA host from ACPI objects
 250  * @host: target ATA host
 251  *
 252  * This function is called during driver detach after the whole host
 253  * is shut down.
 254  *
 255  * LOCKING:
 256  * EH context.
 257  */
 258 void ata_acpi_dissociate(struct ata_host *host)
 259 {
 260         int i;
 261 
 262         /* Restore initial _GTM values so that driver which attaches
 263          * afterward can use them too.
 264          */
 265         for (i = 0; i < host->n_ports; i++) {
 266                 struct ata_port *ap = host->ports[i];
 267                 const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
 268 
 269                 if (ACPI_HANDLE(&ap->tdev) && gtm)
 270                         ata_acpi_stm(ap, gtm);
 271         }
 272 }
 273 
 274 /**
 275  * ata_acpi_gtm - execute _GTM
 276  * @ap: target ATA port
 277  * @gtm: out parameter for _GTM result
 278  *
 279  * Evaluate _GTM and store the result in @gtm.
 280  *
 281  * LOCKING:
 282  * EH context.
 283  *
 284  * RETURNS:
 285  * 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
 286  */
 287 int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
 288 {
 289         struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
 290         union acpi_object *out_obj;
 291         acpi_status status;
 292         int rc = 0;
 293         acpi_handle handle = ACPI_HANDLE(&ap->tdev);
 294 
 295         if (!handle)
 296                 return -EINVAL;
 297 
 298         status = acpi_evaluate_object(handle, "_GTM", NULL, &output);
 299 
 300         rc = -ENOENT;
 301         if (status == AE_NOT_FOUND)
 302                 goto out_free;
 303 
 304         rc = -EINVAL;
 305         if (ACPI_FAILURE(status)) {
 306                 ata_port_err(ap, "ACPI get timing mode failed (AE 0x%x)\n",
 307                              status);
 308                 goto out_free;
 309         }
 310 
 311         out_obj = output.pointer;
 312         if (out_obj->type != ACPI_TYPE_BUFFER) {
 313                 ata_port_warn(ap, "_GTM returned unexpected object type 0x%x\n",
 314                               out_obj->type);
 315 
 316                 goto out_free;
 317         }
 318 
 319         if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
 320                 ata_port_err(ap, "_GTM returned invalid length %d\n",
 321                              out_obj->buffer.length);
 322                 goto out_free;
 323         }
 324 
 325         memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
 326         rc = 0;
 327  out_free:
 328         kfree(output.pointer);
 329         return rc;
 330 }
 331 
 332 EXPORT_SYMBOL_GPL(ata_acpi_gtm);
 333 
 334 /**
 335  * ata_acpi_stm - execute _STM
 336  * @ap: target ATA port
 337  * @stm: timing parameter to _STM
 338  *
 339  * Evaluate _STM with timing parameter @stm.
 340  *
 341  * LOCKING:
 342  * EH context.
 343  *
 344  * RETURNS:
 345  * 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
 346  */
 347 int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
 348 {
 349         acpi_status status;
 350         struct ata_acpi_gtm             stm_buf = *stm;
 351         struct acpi_object_list         input;
 352         union acpi_object               in_params[3];
 353 
 354         in_params[0].type = ACPI_TYPE_BUFFER;
 355         in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
 356         in_params[0].buffer.pointer = (u8 *)&stm_buf;
 357         /* Buffers for id may need byteswapping ? */
 358         in_params[1].type = ACPI_TYPE_BUFFER;
 359         in_params[1].buffer.length = 512;
 360         in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
 361         in_params[2].type = ACPI_TYPE_BUFFER;
 362         in_params[2].buffer.length = 512;
 363         in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
 364 
 365         input.count = 3;
 366         input.pointer = in_params;
 367 
 368         status = acpi_evaluate_object(ACPI_HANDLE(&ap->tdev), "_STM",
 369                                       &input, NULL);
 370 
 371         if (status == AE_NOT_FOUND)
 372                 return -ENOENT;
 373         if (ACPI_FAILURE(status)) {
 374                 ata_port_err(ap, "ACPI set timing mode failed (status=0x%x)\n",
 375                              status);
 376                 return -EINVAL;
 377         }
 378         return 0;
 379 }
 380 
 381 EXPORT_SYMBOL_GPL(ata_acpi_stm);
 382 
 383 /**
 384  * ata_dev_get_GTF - get the drive bootup default taskfile settings
 385  * @dev: target ATA device
 386  * @gtf: output parameter for buffer containing _GTF taskfile arrays
 387  *
 388  * This applies to both PATA and SATA drives.
 389  *
 390  * The _GTF method has no input parameters.
 391  * It returns a variable number of register set values (registers
 392  * hex 1F1..1F7, taskfiles).
 393  * The <variable number> is not known in advance, so have ACPI-CA
 394  * allocate the buffer as needed and return it, then free it later.
 395  *
 396  * LOCKING:
 397  * EH context.
 398  *
 399  * RETURNS:
 400  * Number of taskfiles on success, 0 if _GTF doesn't exist.  -EINVAL
 401  * if _GTF is invalid.
 402  */
 403 static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
 404 {
 405         struct ata_port *ap = dev->link->ap;
 406         acpi_status status;
 407         struct acpi_buffer output;
 408         union acpi_object *out_obj;
 409         int rc = 0;
 410 
 411         /* if _GTF is cached, use the cached value */
 412         if (dev->gtf_cache) {
 413                 out_obj = dev->gtf_cache;
 414                 goto done;
 415         }
 416 
 417         /* set up output buffer */
 418         output.length = ACPI_ALLOCATE_BUFFER;
 419         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 420 
 421         if (ata_msg_probe(ap))
 422                 ata_dev_dbg(dev, "%s: ENTER: port#: %d\n",
 423                             __func__, ap->port_no);
 424 
 425         /* _GTF has no input parameters */
 426         status = acpi_evaluate_object(ata_dev_acpi_handle(dev), "_GTF", NULL,
 427                                       &output);
 428         out_obj = dev->gtf_cache = output.pointer;
 429 
 430         if (ACPI_FAILURE(status)) {
 431                 if (status != AE_NOT_FOUND) {
 432                         ata_dev_warn(dev, "_GTF evaluation failed (AE 0x%x)\n",
 433                                      status);
 434                         rc = -EINVAL;
 435                 }
 436                 goto out_free;
 437         }
 438 
 439         if (!output.length || !output.pointer) {
 440                 if (ata_msg_probe(ap))
 441                         ata_dev_dbg(dev, "%s: Run _GTF: length or ptr is NULL (0x%llx, 0x%p)\n",
 442                                     __func__,
 443                                     (unsigned long long)output.length,
 444                                     output.pointer);
 445                 rc = -EINVAL;
 446                 goto out_free;
 447         }
 448 
 449         if (out_obj->type != ACPI_TYPE_BUFFER) {
 450                 ata_dev_warn(dev, "_GTF unexpected object type 0x%x\n",
 451                              out_obj->type);
 452                 rc = -EINVAL;
 453                 goto out_free;
 454         }
 455 
 456         if (out_obj->buffer.length % REGS_PER_GTF) {
 457                 ata_dev_warn(dev, "unexpected _GTF length (%d)\n",
 458                              out_obj->buffer.length);
 459                 rc = -EINVAL;
 460                 goto out_free;
 461         }
 462 
 463  done:
 464         rc = out_obj->buffer.length / REGS_PER_GTF;
 465         if (gtf) {
 466                 *gtf = (void *)out_obj->buffer.pointer;
 467                 if (ata_msg_probe(ap))
 468                         ata_dev_dbg(dev, "%s: returning gtf=%p, gtf_count=%d\n",
 469                                     __func__, *gtf, rc);
 470         }
 471         return rc;
 472 
 473  out_free:
 474         ata_acpi_clear_gtf(dev);
 475         return rc;
 476 }
 477 
 478 /**
 479  * ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
 480  * @dev: target device
 481  * @gtm: GTM parameter to use
 482  *
 483  * Determine xfermask for @dev from @gtm.
 484  *
 485  * LOCKING:
 486  * None.
 487  *
 488  * RETURNS:
 489  * Determined xfermask.
 490  */
 491 unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
 492                                     const struct ata_acpi_gtm *gtm)
 493 {
 494         unsigned long xfer_mask = 0;
 495         unsigned int type;
 496         int unit;
 497         u8 mode;
 498 
 499         /* we always use the 0 slot for crap hardware */
 500         unit = dev->devno;
 501         if (!(gtm->flags & 0x10))
 502                 unit = 0;
 503 
 504         /* PIO */
 505         mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
 506         xfer_mask |= ata_xfer_mode2mask(mode);
 507 
 508         /* See if we have MWDMA or UDMA data. We don't bother with
 509          * MWDMA if UDMA is available as this means the BIOS set UDMA
 510          * and our error changedown if it works is UDMA to PIO anyway.
 511          */
 512         if (!(gtm->flags & (1 << (2 * unit))))
 513                 type = ATA_SHIFT_MWDMA;
 514         else
 515                 type = ATA_SHIFT_UDMA;
 516 
 517         mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
 518         xfer_mask |= ata_xfer_mode2mask(mode);
 519 
 520         return xfer_mask;
 521 }
 522 EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
 523 
 524 /**
 525  * ata_acpi_cbl_80wire          -       Check for 80 wire cable
 526  * @ap: Port to check
 527  * @gtm: GTM data to use
 528  *
 529  * Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
 530  */
 531 int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
 532 {
 533         struct ata_device *dev;
 534 
 535         ata_for_each_dev(dev, &ap->link, ENABLED) {
 536                 unsigned long xfer_mask, udma_mask;
 537 
 538                 xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
 539                 ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
 540 
 541                 if (udma_mask & ~ATA_UDMA_MASK_40C)
 542                         return 1;
 543         }
 544 
 545         return 0;
 546 }
 547 EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
 548 
 549 static void ata_acpi_gtf_to_tf(struct ata_device *dev,
 550                                const struct ata_acpi_gtf *gtf,
 551                                struct ata_taskfile *tf)
 552 {
 553         ata_tf_init(dev, tf);
 554 
 555         tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
 556         tf->protocol = ATA_PROT_NODATA;
 557         tf->feature = gtf->tf[0];       /* 0x1f1 */
 558         tf->nsect   = gtf->tf[1];       /* 0x1f2 */
 559         tf->lbal    = gtf->tf[2];       /* 0x1f3 */
 560         tf->lbam    = gtf->tf[3];       /* 0x1f4 */
 561         tf->lbah    = gtf->tf[4];       /* 0x1f5 */
 562         tf->device  = gtf->tf[5];       /* 0x1f6 */
 563         tf->command = gtf->tf[6];       /* 0x1f7 */
 564 }
 565 
 566 static int ata_acpi_filter_tf(struct ata_device *dev,
 567                               const struct ata_taskfile *tf,
 568                               const struct ata_taskfile *ptf)
 569 {
 570         if (dev->gtf_filter & ATA_ACPI_FILTER_SETXFER) {
 571                 /* libata doesn't use ACPI to configure transfer mode.
 572                  * It will only confuse device configuration.  Skip.
 573                  */
 574                 if (tf->command == ATA_CMD_SET_FEATURES &&
 575                     tf->feature == SETFEATURES_XFER)
 576                         return 1;
 577         }
 578 
 579         if (dev->gtf_filter & ATA_ACPI_FILTER_LOCK) {
 580                 /* BIOS writers, sorry but we don't wanna lock
 581                  * features unless the user explicitly said so.
 582                  */
 583 
 584                 /* DEVICE CONFIGURATION FREEZE LOCK */
 585                 if (tf->command == ATA_CMD_CONF_OVERLAY &&
 586                     tf->feature == ATA_DCO_FREEZE_LOCK)
 587                         return 1;
 588 
 589                 /* SECURITY FREEZE LOCK */
 590                 if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
 591                         return 1;
 592 
 593                 /* SET MAX LOCK and SET MAX FREEZE LOCK */
 594                 if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
 595                     tf->command == ATA_CMD_SET_MAX &&
 596                     (tf->feature == ATA_SET_MAX_LOCK ||
 597                      tf->feature == ATA_SET_MAX_FREEZE_LOCK))
 598                         return 1;
 599         }
 600 
 601         if (tf->command == ATA_CMD_SET_FEATURES &&
 602             tf->feature == SETFEATURES_SATA_ENABLE) {
 603                 /* inhibit enabling DIPM */
 604                 if (dev->gtf_filter & ATA_ACPI_FILTER_DIPM &&
 605                     tf->nsect == SATA_DIPM)
 606                         return 1;
 607 
 608                 /* inhibit FPDMA non-zero offset */
 609                 if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_OFFSET &&
 610                     (tf->nsect == SATA_FPDMA_OFFSET ||
 611                      tf->nsect == SATA_FPDMA_IN_ORDER))
 612                         return 1;
 613 
 614                 /* inhibit FPDMA auto activation */
 615                 if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_AA &&
 616                     tf->nsect == SATA_FPDMA_AA)
 617                         return 1;
 618         }
 619 
 620         return 0;
 621 }
 622 
 623 /**
 624  * ata_acpi_run_tf - send taskfile registers to host controller
 625  * @dev: target ATA device
 626  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 627  *
 628  * Outputs ATA taskfile to standard ATA host controller.
 629  * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
 630  * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
 631  * hob_lbal, hob_lbam, and hob_lbah.
 632  *
 633  * This function waits for idle (!BUSY and !DRQ) after writing
 634  * registers.  If the control register has a new value, this
 635  * function also waits for idle after writing control and before
 636  * writing the remaining registers.
 637  *
 638  * LOCKING:
 639  * EH context.
 640  *
 641  * RETURNS:
 642  * 1 if command is executed successfully.  0 if ignored, rejected or
 643  * filtered out, -errno on other errors.
 644  */
 645 static int ata_acpi_run_tf(struct ata_device *dev,
 646                            const struct ata_acpi_gtf *gtf,
 647                            const struct ata_acpi_gtf *prev_gtf)
 648 {
 649         struct ata_taskfile *pptf = NULL;
 650         struct ata_taskfile tf, ptf, rtf;
 651         unsigned int err_mask;
 652         const char *level;
 653         const char *descr;
 654         char msg[60];
 655         int rc;
 656 
 657         if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
 658             && (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
 659             && (gtf->tf[6] == 0))
 660                 return 0;
 661 
 662         ata_acpi_gtf_to_tf(dev, gtf, &tf);
 663         if (prev_gtf) {
 664                 ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
 665                 pptf = &ptf;
 666         }
 667 
 668         if (!ata_acpi_filter_tf(dev, &tf, pptf)) {
 669                 rtf = tf;
 670                 err_mask = ata_exec_internal(dev, &rtf, NULL,
 671                                              DMA_NONE, NULL, 0, 0);
 672 
 673                 switch (err_mask) {
 674                 case 0:
 675                         level = KERN_DEBUG;
 676                         snprintf(msg, sizeof(msg), "succeeded");
 677                         rc = 1;
 678                         break;
 679 
 680                 case AC_ERR_DEV:
 681                         level = KERN_INFO;
 682                         snprintf(msg, sizeof(msg),
 683                                  "rejected by device (Stat=0x%02x Err=0x%02x)",
 684                                  rtf.command, rtf.feature);
 685                         rc = 0;
 686                         break;
 687 
 688                 default:
 689                         level = KERN_ERR;
 690                         snprintf(msg, sizeof(msg),
 691                                  "failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
 692                                  err_mask, rtf.command, rtf.feature);
 693                         rc = -EIO;
 694                         break;
 695                 }
 696         } else {
 697                 level = KERN_INFO;
 698                 snprintf(msg, sizeof(msg), "filtered out");
 699                 rc = 0;
 700         }
 701         descr = ata_get_cmd_descript(tf.command);
 702 
 703         ata_dev_printk(dev, level,
 704                        "ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x (%s) %s\n",
 705                        tf.command, tf.feature, tf.nsect, tf.lbal,
 706                        tf.lbam, tf.lbah, tf.device,
 707                        (descr ? descr : "unknown"), msg);
 708 
 709         return rc;
 710 }
 711 
 712 /**
 713  * ata_acpi_exec_tfs - get then write drive taskfile settings
 714  * @dev: target ATA device
 715  * @nr_executed: out parameter for the number of executed commands
 716  *
 717  * Evaluate _GTF and execute returned taskfiles.
 718  *
 719  * LOCKING:
 720  * EH context.
 721  *
 722  * RETURNS:
 723  * Number of executed taskfiles on success, 0 if _GTF doesn't exist.
 724  * -errno on other errors.
 725  */
 726 static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
 727 {
 728         struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
 729         int gtf_count, i, rc;
 730 
 731         /* get taskfiles */
 732         rc = ata_dev_get_GTF(dev, &gtf);
 733         if (rc < 0)
 734                 return rc;
 735         gtf_count = rc;
 736 
 737         /* execute them */
 738         for (i = 0; i < gtf_count; i++, gtf++) {
 739                 rc = ata_acpi_run_tf(dev, gtf, pgtf);
 740                 if (rc < 0)
 741                         break;
 742                 if (rc) {
 743                         (*nr_executed)++;
 744                         pgtf = gtf;
 745                 }
 746         }
 747 
 748         ata_acpi_clear_gtf(dev);
 749 
 750         if (rc < 0)
 751                 return rc;
 752         return 0;
 753 }
 754 
 755 /**
 756  * ata_acpi_push_id - send Identify data to drive
 757  * @dev: target ATA device
 758  *
 759  * _SDD ACPI object: for SATA mode only
 760  * Must be after Identify (Packet) Device -- uses its data
 761  * ATM this function never returns a failure.  It is an optional
 762  * method and if it fails for whatever reason, we should still
 763  * just keep going.
 764  *
 765  * LOCKING:
 766  * EH context.
 767  *
 768  * RETURNS:
 769  * 0 on success, -ENOENT if _SDD doesn't exist, -errno on failure.
 770  */
 771 static int ata_acpi_push_id(struct ata_device *dev)
 772 {
 773         struct ata_port *ap = dev->link->ap;
 774         acpi_status status;
 775         struct acpi_object_list input;
 776         union acpi_object in_params[1];
 777 
 778         if (ata_msg_probe(ap))
 779                 ata_dev_dbg(dev, "%s: ix = %d, port#: %d\n",
 780                             __func__, dev->devno, ap->port_no);
 781 
 782         /* Give the drive Identify data to the drive via the _SDD method */
 783         /* _SDD: set up input parameters */
 784         input.count = 1;
 785         input.pointer = in_params;
 786         in_params[0].type = ACPI_TYPE_BUFFER;
 787         in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
 788         in_params[0].buffer.pointer = (u8 *)dev->id;
 789         /* Output buffer: _SDD has no output */
 790 
 791         /* It's OK for _SDD to be missing too. */
 792         swap_buf_le16(dev->id, ATA_ID_WORDS);
 793         status = acpi_evaluate_object(ata_dev_acpi_handle(dev), "_SDD", &input,
 794                                       NULL);
 795         swap_buf_le16(dev->id, ATA_ID_WORDS);
 796 
 797         if (status == AE_NOT_FOUND)
 798                 return -ENOENT;
 799 
 800         if (ACPI_FAILURE(status)) {
 801                 ata_dev_warn(dev, "ACPI _SDD failed (AE 0x%x)\n", status);
 802                 return -EIO;
 803         }
 804 
 805         return 0;
 806 }
 807 
 808 /**
 809  * ata_acpi_on_suspend - ATA ACPI hook called on suspend
 810  * @ap: target ATA port
 811  *
 812  * This function is called when @ap is about to be suspended.  All
 813  * devices are already put to sleep but the port_suspend() callback
 814  * hasn't been executed yet.  Error return from this function aborts
 815  * suspend.
 816  *
 817  * LOCKING:
 818  * EH context.
 819  *
 820  * RETURNS:
 821  * 0 on success, -errno on failure.
 822  */
 823 int ata_acpi_on_suspend(struct ata_port *ap)
 824 {
 825         /* nada */
 826         return 0;
 827 }
 828 
 829 /**
 830  * ata_acpi_on_resume - ATA ACPI hook called on resume
 831  * @ap: target ATA port
 832  *
 833  * This function is called when @ap is resumed - right after port
 834  * itself is resumed but before any EH action is taken.
 835  *
 836  * LOCKING:
 837  * EH context.
 838  */
 839 void ata_acpi_on_resume(struct ata_port *ap)
 840 {
 841         const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
 842         struct ata_device *dev;
 843 
 844         if (ACPI_HANDLE(&ap->tdev) && gtm) {
 845                 /* _GTM valid */
 846 
 847                 /* restore timing parameters */
 848                 ata_acpi_stm(ap, gtm);
 849 
 850                 /* _GTF should immediately follow _STM so that it can
 851                  * use values set by _STM.  Cache _GTF result and
 852                  * schedule _GTF.
 853                  */
 854                 ata_for_each_dev(dev, &ap->link, ALL) {
 855                         ata_acpi_clear_gtf(dev);
 856                         if (ata_dev_enabled(dev) &&
 857                             ata_dev_acpi_handle(dev) &&
 858                             ata_dev_get_GTF(dev, NULL) >= 0)
 859                                 dev->flags |= ATA_DFLAG_ACPI_PENDING;
 860                 }
 861         } else {
 862                 /* SATA _GTF needs to be evaulated after _SDD and
 863                  * there's no reason to evaluate IDE _GTF early
 864                  * without _STM.  Clear cache and schedule _GTF.
 865                  */
 866                 ata_for_each_dev(dev, &ap->link, ALL) {
 867                         ata_acpi_clear_gtf(dev);
 868                         if (ata_dev_enabled(dev))
 869                                 dev->flags |= ATA_DFLAG_ACPI_PENDING;
 870                 }
 871         }
 872 }
 873 
 874 static int ata_acpi_choose_suspend_state(struct ata_device *dev, bool runtime)
 875 {
 876         int d_max_in = ACPI_STATE_D3_COLD;
 877         if (!runtime)
 878                 goto out;
 879 
 880         /*
 881          * For ATAPI, runtime D3 cold is only allowed
 882          * for ZPODD in zero power ready state
 883          */
 884         if (dev->class == ATA_DEV_ATAPI &&
 885             !(zpodd_dev_enabled(dev) && zpodd_zpready(dev)))
 886                 d_max_in = ACPI_STATE_D3_HOT;
 887 
 888 out:
 889         return acpi_pm_device_sleep_state(&dev->tdev, NULL, d_max_in);
 890 }
 891 
 892 static void sata_acpi_set_state(struct ata_port *ap, pm_message_t state)
 893 {
 894         bool runtime = PMSG_IS_AUTO(state);
 895         struct ata_device *dev;
 896         acpi_handle handle;
 897         int acpi_state;
 898 
 899         ata_for_each_dev(dev, &ap->link, ENABLED) {
 900                 handle = ata_dev_acpi_handle(dev);
 901                 if (!handle)
 902                         continue;
 903 
 904                 if (!(state.event & PM_EVENT_RESUME)) {
 905                         acpi_state = ata_acpi_choose_suspend_state(dev, runtime);
 906                         if (acpi_state == ACPI_STATE_D0)
 907                                 continue;
 908                         if (runtime && zpodd_dev_enabled(dev) &&
 909                             acpi_state == ACPI_STATE_D3_COLD)
 910                                 zpodd_enable_run_wake(dev);
 911                         acpi_bus_set_power(handle, acpi_state);
 912                 } else {
 913                         if (runtime && zpodd_dev_enabled(dev))
 914                                 zpodd_disable_run_wake(dev);
 915                         acpi_bus_set_power(handle, ACPI_STATE_D0);
 916                 }
 917         }
 918 }
 919 
 920 /* ACPI spec requires _PS0 when IDE power on and _PS3 when power off */
 921 static void pata_acpi_set_state(struct ata_port *ap, pm_message_t state)
 922 {
 923         struct ata_device *dev;
 924         acpi_handle port_handle;
 925 
 926         port_handle = ACPI_HANDLE(&ap->tdev);
 927         if (!port_handle)
 928                 return;
 929 
 930         /* channel first and then drives for power on and vica versa
 931            for power off */
 932         if (state.event & PM_EVENT_RESUME)
 933                 acpi_bus_set_power(port_handle, ACPI_STATE_D0);
 934 
 935         ata_for_each_dev(dev, &ap->link, ENABLED) {
 936                 acpi_handle dev_handle = ata_dev_acpi_handle(dev);
 937                 if (!dev_handle)
 938                         continue;
 939 
 940                 acpi_bus_set_power(dev_handle, state.event & PM_EVENT_RESUME ?
 941                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 942         }
 943 
 944         if (!(state.event & PM_EVENT_RESUME))
 945                 acpi_bus_set_power(port_handle, ACPI_STATE_D3_COLD);
 946 }
 947 
 948 /**
 949  * ata_acpi_set_state - set the port power state
 950  * @ap: target ATA port
 951  * @state: state, on/off
 952  *
 953  * This function sets a proper ACPI D state for the device on
 954  * system and runtime PM operations.
 955  */
 956 void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
 957 {
 958         if (ap->flags & ATA_FLAG_ACPI_SATA)
 959                 sata_acpi_set_state(ap, state);
 960         else
 961                 pata_acpi_set_state(ap, state);
 962 }
 963 
 964 /**
 965  * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
 966  * @dev: target ATA device
 967  *
 968  * This function is called when @dev is about to be configured.
 969  * IDENTIFY data might have been modified after this hook is run.
 970  *
 971  * LOCKING:
 972  * EH context.
 973  *
 974  * RETURNS:
 975  * Positive number if IDENTIFY data needs to be refreshed, 0 if not,
 976  * -errno on failure.
 977  */
 978 int ata_acpi_on_devcfg(struct ata_device *dev)
 979 {
 980         struct ata_port *ap = dev->link->ap;
 981         struct ata_eh_context *ehc = &ap->link.eh_context;
 982         int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
 983         int nr_executed = 0;
 984         int rc;
 985 
 986         if (!ata_dev_acpi_handle(dev))
 987                 return 0;
 988 
 989         /* do we need to do _GTF? */
 990         if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
 991             !(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
 992                 return 0;
 993 
 994         /* do _SDD if SATA */
 995         if (acpi_sata) {
 996                 rc = ata_acpi_push_id(dev);
 997                 if (rc && rc != -ENOENT)
 998                         goto acpi_err;
 999         }
1000 
1001         /* do _GTF */
1002         rc = ata_acpi_exec_tfs(dev, &nr_executed);
1003         if (rc)
1004                 goto acpi_err;
1005 
1006         dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
1007 
1008         /* refresh IDENTIFY page if any _GTF command has been executed */
1009         if (nr_executed) {
1010                 rc = ata_dev_reread_id(dev, 0);
1011                 if (rc < 0) {
1012                         ata_dev_err(dev,
1013                                     "failed to IDENTIFY after ACPI commands\n");
1014                         return rc;
1015                 }
1016         }
1017 
1018         return 0;
1019 
1020  acpi_err:
1021         /* ignore evaluation failure if we can continue safely */
1022         if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1023                 return 0;
1024 
1025         /* fail and let EH retry once more for unknown IO errors */
1026         if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
1027                 dev->flags |= ATA_DFLAG_ACPI_FAILED;
1028                 return rc;
1029         }
1030 
1031         dev->flags |= ATA_DFLAG_ACPI_DISABLED;
1032         ata_dev_warn(dev, "ACPI: failed the second time, disabled\n");
1033 
1034         /* We can safely continue if no _GTF command has been executed
1035          * and port is not frozen.
1036          */
1037         if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
1038                 return 0;
1039 
1040         return rc;
1041 }
1042 
1043 /**
1044  * ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
1045  * @dev: target ATA device
1046  *
1047  * This function is called when @dev is about to be disabled.
1048  *
1049  * LOCKING:
1050  * EH context.
1051  */
1052 void ata_acpi_on_disable(struct ata_device *dev)
1053 {
1054         ata_acpi_clear_gtf(dev);
1055 }
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root/drivers/ata/libata-acpi.c

DEFINITIONS
