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 24unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT; 25module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644); 26MODULE_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 32struct ata_acpi_gtf { 33 u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */ 34} __packed; 35 36static void ata_acpi_clear_gtf(struct ata_device *dev) 37{ 38 kfree(dev->gtf_cache); 39 dev->gtf_cache = NULL; 40} 41 42struct 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 */ 60acpi_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() */ 67static 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 */ 100static 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 135static 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 142static 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 148static 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 167static 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 172static 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 */ 179void 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 206void 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 */ 258void 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 */ 287int 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 332EXPORT_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 */ 347int 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 381EXPORT_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 */ 403static 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 */ 491unsigned 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} 522EXPORT_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 */ 531int 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} 547EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire); 548 549static 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 566static 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 */ 645static 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 */ 726static 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, >f); 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 */ 771static 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 */ 823int 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 */ 839void 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 874static 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 888out: 889 return acpi_pm_device_sleep_state(&dev->tdev, NULL, d_max_in); 890} 891 892static 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 */ 921static 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 */ 956void 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 */ 978int 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 */ 1052void ata_acpi_on_disable(struct ata_device *dev) 1053{ 1054 ata_acpi_clear_gtf(dev); 1055} 1056