1 /* 2 * sleep.c - ACPI sleep support. 3 * 4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> 5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> 6 * Copyright (c) 2000-2003 Patrick Mochel 7 * Copyright (c) 2003 Open Source Development Lab 8 * 9 * This file is released under the GPLv2. 10 * 11 */ 12 13 #include <linux/delay.h> 14 #include <linux/irq.h> 15 #include <linux/dmi.h> 16 #include <linux/device.h> 17 #include <linux/suspend.h> 18 #include <linux/reboot.h> 19 20 #include <asm/io.h> 21 22 #include <acpi/acpi_bus.h> 23 #include <acpi/acpi_drivers.h> 24 25 #include "internal.h" 26 #include "sleep.h" 27 28 u8 sleep_states[ACPI_S_STATE_COUNT]; 29 30 static void acpi_sleep_tts_switch(u32 acpi_state) 31 { 32 union acpi_object in_arg = { ACPI_TYPE_INTEGER }; 33 struct acpi_object_list arg_list = { 1, &in_arg }; 34 acpi_status status = AE_OK; 35 36 in_arg.integer.value = acpi_state; 37 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); 38 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 39 /* 40 * OS can't evaluate the _TTS object correctly. Some warning 41 * message will be printed. But it won't break anything. 42 */ 43 printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 44 } 45 } 46 47 static int tts_notify_reboot(struct notifier_block *this, 48 unsigned long code, void *x) 49 { 50 acpi_sleep_tts_switch(ACPI_STATE_S5); 51 return NOTIFY_DONE; 52 } 53 54 static struct notifier_block tts_notifier = { 55 .notifier_call = tts_notify_reboot, 56 .next = NULL, 57 .priority = 0, 58 }; 59 60 static int acpi_sleep_prepare(u32 acpi_state) 61 { 62 #ifdef CONFIG_ACPI_SLEEP 63 /* do we have a wakeup address for S2 and S3? */ 64 if (acpi_state == ACPI_STATE_S3) { 65 if (!acpi_wakeup_address) { 66 return -EFAULT; 67 } 68 acpi_set_firmware_waking_vector( 69 (acpi_physical_address)acpi_wakeup_address); 70 71 } 72 ACPI_FLUSH_CPU_CACHE(); 73 acpi_enable_wakeup_device_prep(acpi_state); 74 #endif 75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 76 acpi_state); 77 acpi_enter_sleep_state_prep(acpi_state); 78 return 0; 79 } 80 81 #ifdef CONFIG_ACPI_SLEEP 82 static u32 acpi_target_sleep_state = ACPI_STATE_S0; 83 84 /* 85 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the 86 * user to request that behavior by using the 'acpi_old_suspend_ordering' 87 * kernel command line option that causes the following variable to be set. 88 */ 89 static bool old_suspend_ordering; 90 91 void __init acpi_old_suspend_ordering(void) 92 { 93 old_suspend_ordering = true; 94 } 95 96 /** 97 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. 98 */ 99 static int acpi_pm_freeze(void) 100 { 101 acpi_disable_all_gpes(); 102 acpi_os_wait_events_complete(NULL); 103 acpi_ec_block_transactions(); 104 return 0; 105 } 106 107 /** 108 * __acpi_pm_prepare - Prepare the platform to enter the target state. 109 * 110 * If necessary, set the firmware waking vector and do arch-specific 111 * nastiness to get the wakeup code to the waking vector. 112 */ 113 static int __acpi_pm_prepare(void) 114 { 115 int error = acpi_sleep_prepare(acpi_target_sleep_state); 116 117 suspend_nvs_save(); 118 119 if (error) 120 acpi_target_sleep_state = ACPI_STATE_S0; 121 return error; 122 } 123 124 /** 125 * acpi_pm_prepare - Prepare the platform to enter the target sleep 126 * state and disable the GPEs. 127 */ 128 static int acpi_pm_prepare(void) 129 { 130 int error = __acpi_pm_prepare(); 131 132 if (!error) 133 acpi_pm_freeze(); 134 135 return error; 136 } 137 138 /** 139 * acpi_pm_finish - Instruct the platform to leave a sleep state. 140 * 141 * This is called after we wake back up (or if entering the sleep state 142 * failed). 143 */ 144 static void acpi_pm_finish(void) 145 { 146 u32 acpi_state = acpi_target_sleep_state; 147 148 suspend_nvs_free(); 149 acpi_ec_unblock_transactions(); 150 151 if (acpi_state == ACPI_STATE_S0) 152 return; 153 154 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", 155 acpi_state); 156 acpi_disable_wakeup_device(acpi_state); 157 acpi_leave_sleep_state(acpi_state); 158 159 /* reset firmware waking vector */ 160 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 161 162 acpi_target_sleep_state = ACPI_STATE_S0; 163 } 164 165 /** 166 * acpi_pm_end - Finish up suspend sequence. 167 */ 168 static void acpi_pm_end(void) 169 { 170 /* 171 * This is necessary in case acpi_pm_finish() is not called during a 172 * failing transition to a sleep state. 173 */ 174 acpi_target_sleep_state = ACPI_STATE_S0; 175 acpi_sleep_tts_switch(acpi_target_sleep_state); 176 } 177 #else /* !CONFIG_ACPI_SLEEP */ 178 #define acpi_target_sleep_state ACPI_STATE_S0 179 #endif /* CONFIG_ACPI_SLEEP */ 180 181 #ifdef CONFIG_SUSPEND 182 extern void do_suspend_lowlevel(void); 183 184 static u32 acpi_suspend_states[] = { 185 [PM_SUSPEND_ON] = ACPI_STATE_S0, 186 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 187 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 188 [PM_SUSPEND_MAX] = ACPI_STATE_S5 189 }; 190 191 /** 192 * acpi_suspend_begin - Set the target system sleep state to the state 193 * associated with given @pm_state, if supported. 194 */ 195 static int acpi_suspend_begin(suspend_state_t pm_state) 196 { 197 u32 acpi_state = acpi_suspend_states[pm_state]; 198 int error = 0; 199 200 error = suspend_nvs_alloc(); 201 202 if (error) 203 return error; 204 205 if (sleep_states[acpi_state]) { 206 acpi_target_sleep_state = acpi_state; 207 acpi_sleep_tts_switch(acpi_target_sleep_state); 208 } else { 209 printk(KERN_ERR "ACPI does not support this state: %d\n", 210 pm_state); 211 error = -ENOSYS; 212 } 213 return error; 214 } 215 216 /** 217 * acpi_suspend_enter - Actually enter a sleep state. 218 * @pm_state: ignored 219 * 220 * Flush caches and go to sleep. For STR we have to call arch-specific 221 * assembly, which in turn call acpi_enter_sleep_state(). 222 * It's unfortunate, but it works. Please fix if you're feeling frisky. 223 */ 224 static int acpi_suspend_enter(suspend_state_t pm_state) 225 { 226 acpi_status status = AE_OK; 227 unsigned long flags = 0; 228 u32 acpi_state = acpi_target_sleep_state; 229 230 ACPI_FLUSH_CPU_CACHE(); 231 232 /* Do arch specific saving of state. */ 233 if (acpi_state == ACPI_STATE_S3) { 234 int error = acpi_save_state_mem(); 235 236 if (error) 237 return error; 238 } 239 240 local_irq_save(flags); 241 acpi_enable_wakeup_device(acpi_state); 242 switch (acpi_state) { 243 case ACPI_STATE_S1: 244 barrier(); 245 status = acpi_enter_sleep_state(acpi_state); 246 break; 247 248 case ACPI_STATE_S3: 249 do_suspend_lowlevel(); 250 break; 251 } 252 253 /* This violates the spec but is required for bug compatibility. */ 254 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); 255 256 /* Reprogram control registers and execute _BFS */ 257 acpi_leave_sleep_state_prep(acpi_state); 258 259 /* ACPI 3.0 specs (P62) says that it's the responsibility 260 * of the OSPM to clear the status bit [ implying that the 261 * POWER_BUTTON event should not reach userspace ] 262 */ 263 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) 264 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 265 266 /* 267 * Disable and clear GPE status before interrupt is enabled. Some GPEs 268 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 269 * acpi_leave_sleep_state will reenable specific GPEs later 270 */ 271 acpi_disable_all_gpes(); 272 /* Allow EC transactions to happen. */ 273 acpi_ec_unblock_transactions_early(); 274 275 local_irq_restore(flags); 276 printk(KERN_DEBUG "Back to C!\n"); 277 278 /* restore processor state */ 279 if (acpi_state == ACPI_STATE_S3) 280 acpi_restore_state_mem(); 281 282 suspend_nvs_restore(); 283 284 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 285 } 286 287 static void acpi_suspend_finish(void) 288 { 289 acpi_pm_finish(); 290 } 291 292 static int acpi_suspend_state_valid(suspend_state_t pm_state) 293 { 294 u32 acpi_state; 295 296 switch (pm_state) { 297 case PM_SUSPEND_ON: 298 case PM_SUSPEND_STANDBY: 299 case PM_SUSPEND_MEM: 300 acpi_state = acpi_suspend_states[pm_state]; 301 302 return sleep_states[acpi_state]; 303 default: 304 return 0; 305 } 306 } 307 308 static struct platform_suspend_ops acpi_suspend_ops = { 309 .valid = acpi_suspend_state_valid, 310 .begin = acpi_suspend_begin, 311 .prepare_late = acpi_pm_prepare, 312 .enter = acpi_suspend_enter, 313 .wake = acpi_suspend_finish, 314 .end = acpi_pm_end, 315 }; 316 317 /** 318 * acpi_suspend_begin_old - Set the target system sleep state to the 319 * state associated with given @pm_state, if supported, and 320 * execute the _PTS control method. This function is used if the 321 * pre-ACPI 2.0 suspend ordering has been requested. 322 */ 323 static int acpi_suspend_begin_old(suspend_state_t pm_state) 324 { 325 int error = acpi_suspend_begin(pm_state); 326 327 if (!error) 328 error = __acpi_pm_prepare(); 329 return error; 330 } 331 332 /* 333 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 334 * been requested. 335 */ 336 static struct platform_suspend_ops acpi_suspend_ops_old = { 337 .valid = acpi_suspend_state_valid, 338 .begin = acpi_suspend_begin_old, 339 .prepare_late = acpi_pm_freeze, 340 .enter = acpi_suspend_enter, 341 .wake = acpi_suspend_finish, 342 .end = acpi_pm_end, 343 .recover = acpi_pm_finish, 344 }; 345 346 static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 347 { 348 old_suspend_ordering = true; 349 return 0; 350 } 351 352 static struct dmi_system_id __initdata acpisleep_dmi_table[] = { 353 { 354 .callback = init_old_suspend_ordering, 355 .ident = "Abit KN9 (nForce4 variant)", 356 .matches = { 357 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 358 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 359 }, 360 }, 361 { 362 .callback = init_old_suspend_ordering, 363 .ident = "HP xw4600 Workstation", 364 .matches = { 365 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 366 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 367 }, 368 }, 369 { 370 .callback = init_old_suspend_ordering, 371 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 372 .matches = { 373 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 374 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 375 }, 376 }, 377 { 378 .callback = init_old_suspend_ordering, 379 .ident = "Panasonic CF51-2L", 380 .matches = { 381 DMI_MATCH(DMI_BOARD_VENDOR, 382 "Matsushita Electric Industrial Co.,Ltd."), 383 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 384 }, 385 }, 386 {}, 387 }; 388 #endif /* CONFIG_SUSPEND */ 389 390 #ifdef CONFIG_HIBERNATION 391 /* 392 * The ACPI specification wants us to save NVS memory regions during hibernation 393 * and to restore them during the subsequent resume. However, it is not certain 394 * if this mechanism is going to work on all machines, so we allow the user to 395 * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line 396 * option. 397 */ 398 static bool s4_no_nvs; 399 400 void __init acpi_s4_no_nvs(void) 401 { 402 s4_no_nvs = true; 403 } 404 405 static unsigned long s4_hardware_signature; 406 static struct acpi_table_facs *facs; 407 static bool nosigcheck; 408 409 void __init acpi_no_s4_hw_signature(void) 410 { 411 nosigcheck = true; 412 } 413 414 static int acpi_hibernation_begin(void) 415 { 416 int error; 417 418 error = s4_no_nvs ? 0 : suspend_nvs_alloc(); 419 if (!error) { 420 acpi_target_sleep_state = ACPI_STATE_S4; 421 acpi_sleep_tts_switch(acpi_target_sleep_state); 422 } 423 424 return error; 425 } 426 427 static int acpi_hibernation_pre_snapshot(void) 428 { 429 int error = acpi_pm_prepare(); 430 431 if (!error) 432 suspend_nvs_save(); 433 434 return error; 435 } 436 437 static int acpi_hibernation_enter(void) 438 { 439 acpi_status status = AE_OK; 440 unsigned long flags = 0; 441 442 ACPI_FLUSH_CPU_CACHE(); 443 444 local_irq_save(flags); 445 acpi_enable_wakeup_device(ACPI_STATE_S4); 446 /* This shouldn't return. If it returns, we have a problem */ 447 status = acpi_enter_sleep_state(ACPI_STATE_S4); 448 /* Reprogram control registers and execute _BFS */ 449 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 450 local_irq_restore(flags); 451 452 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 453 } 454 455 static void acpi_hibernation_leave(void) 456 { 457 /* 458 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 459 * enable it here. 460 */ 461 acpi_enable(); 462 /* Reprogram control registers and execute _BFS */ 463 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 464 /* Check the hardware signature */ 465 if (facs && s4_hardware_signature != facs->hardware_signature) { 466 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 467 "cannot resume!\n"); 468 panic("ACPI S4 hardware signature mismatch"); 469 } 470 /* Restore the NVS memory area */ 471 suspend_nvs_restore(); 472 /* Allow EC transactions to happen. */ 473 acpi_ec_unblock_transactions_early(); 474 } 475 476 static void acpi_pm_thaw(void) 477 { 478 acpi_ec_unblock_transactions(); 479 acpi_enable_all_runtime_gpes(); 480 } 481 482 static struct platform_hibernation_ops acpi_hibernation_ops = { 483 .begin = acpi_hibernation_begin, 484 .end = acpi_pm_end, 485 .pre_snapshot = acpi_hibernation_pre_snapshot, 486 .finish = acpi_pm_finish, 487 .prepare = acpi_pm_prepare, 488 .enter = acpi_hibernation_enter, 489 .leave = acpi_hibernation_leave, 490 .pre_restore = acpi_pm_freeze, 491 .restore_cleanup = acpi_pm_thaw, 492 }; 493 494 /** 495 * acpi_hibernation_begin_old - Set the target system sleep state to 496 * ACPI_STATE_S4 and execute the _PTS control method. This 497 * function is used if the pre-ACPI 2.0 suspend ordering has been 498 * requested. 499 */ 500 static int acpi_hibernation_begin_old(void) 501 { 502 int error; 503 /* 504 * The _TTS object should always be evaluated before the _PTS object. 505 * When the old_suspended_ordering is true, the _PTS object is 506 * evaluated in the acpi_sleep_prepare. 507 */ 508 acpi_sleep_tts_switch(ACPI_STATE_S4); 509 510 error = acpi_sleep_prepare(ACPI_STATE_S4); 511 512 if (!error) { 513 if (!s4_no_nvs) 514 error = suspend_nvs_alloc(); 515 if (!error) 516 acpi_target_sleep_state = ACPI_STATE_S4; 517 } 518 return error; 519 } 520 521 static int acpi_hibernation_pre_snapshot_old(void) 522 { 523 acpi_pm_freeze(); 524 suspend_nvs_save(); 525 return 0; 526 } 527 528 /* 529 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 530 * been requested. 531 */ 532 static struct platform_hibernation_ops acpi_hibernation_ops_old = { 533 .begin = acpi_hibernation_begin_old, 534 .end = acpi_pm_end, 535 .pre_snapshot = acpi_hibernation_pre_snapshot_old, 536 .prepare = acpi_pm_freeze, 537 .finish = acpi_pm_finish, 538 .enter = acpi_hibernation_enter, 539 .leave = acpi_hibernation_leave, 540 .pre_restore = acpi_pm_freeze, 541 .restore_cleanup = acpi_pm_thaw, 542 .recover = acpi_pm_finish, 543 }; 544 #endif /* CONFIG_HIBERNATION */ 545 546 int acpi_suspend(u32 acpi_state) 547 { 548 suspend_state_t states[] = { 549 [1] = PM_SUSPEND_STANDBY, 550 [3] = PM_SUSPEND_MEM, 551 [5] = PM_SUSPEND_MAX 552 }; 553 554 if (acpi_state < 6 && states[acpi_state]) 555 return pm_suspend(states[acpi_state]); 556 if (acpi_state == 4) 557 return hibernate(); 558 return -EINVAL; 559 } 560 561 #ifdef CONFIG_PM_SLEEP 562 /** 563 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 564 * in the system sleep state given by %acpi_target_sleep_state 565 * @dev: device to examine; its driver model wakeup flags control 566 * whether it should be able to wake up the system 567 * @d_min_p: used to store the upper limit of allowed states range 568 * Return value: preferred power state of the device on success, -ENODEV on 569 * failure (ie. if there's no 'struct acpi_device' for @dev) 570 * 571 * Find the lowest power (highest number) ACPI device power state that 572 * device @dev can be in while the system is in the sleep state represented 573 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 574 * able to wake up the system from this sleep state. If @d_min_p is set, 575 * the highest power (lowest number) device power state of @dev allowed 576 * in this system sleep state is stored at the location pointed to by it. 577 * 578 * The caller must ensure that @dev is valid before using this function. 579 * The caller is also responsible for figuring out if the device is 580 * supposed to be able to wake up the system and passing this information 581 * via @wake. 582 */ 583 584 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 585 { 586 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 587 struct acpi_device *adev; 588 char acpi_method[] = "_SxD"; 589 unsigned long long d_min, d_max; 590 591 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 592 printk(KERN_DEBUG "ACPI handle has no context!\n"); 593 return -ENODEV; 594 } 595 596 acpi_method[2] = '0' + acpi_target_sleep_state; 597 /* 598 * If the sleep state is S0, we will return D3, but if the device has 599 * _S0W, we will use the value from _S0W 600 */ 601 d_min = ACPI_STATE_D0; 602 d_max = ACPI_STATE_D3; 603 604 /* 605 * If present, _SxD methods return the minimum D-state (highest power 606 * state) we can use for the corresponding S-states. Otherwise, the 607 * minimum D-state is D0 (ACPI 3.x). 608 * 609 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 610 * provided -- that's our fault recovery, we ignore retval. 611 */ 612 if (acpi_target_sleep_state > ACPI_STATE_S0) 613 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 614 615 /* 616 * If _PRW says we can wake up the system from the target sleep state, 617 * the D-state returned by _SxD is sufficient for that (we assume a 618 * wakeup-aware driver if wake is set). Still, if _SxW exists 619 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 620 * can wake the system. _S0W may be valid, too. 621 */ 622 if (acpi_target_sleep_state == ACPI_STATE_S0 || 623 (device_may_wakeup(dev) && adev->wakeup.state.enabled && 624 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 625 acpi_status status; 626 627 acpi_method[3] = 'W'; 628 status = acpi_evaluate_integer(handle, acpi_method, NULL, 629 &d_max); 630 if (ACPI_FAILURE(status)) { 631 d_max = d_min; 632 } else if (d_max < d_min) { 633 /* Warn the user of the broken DSDT */ 634 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 635 acpi_method); 636 /* Sanitize it */ 637 d_min = d_max; 638 } 639 } 640 641 if (d_min_p) 642 *d_min_p = d_min; 643 return d_max; 644 } 645 646 /** 647 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 648 * capability of given device 649 * @dev: device to handle 650 * @enable: 'true' - enable, 'false' - disable the wake-up capability 651 */ 652 int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 653 { 654 acpi_handle handle; 655 struct acpi_device *adev; 656 int error; 657 658 if (!device_can_wakeup(dev)) 659 return -EINVAL; 660 661 handle = DEVICE_ACPI_HANDLE(dev); 662 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 663 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); 664 return -ENODEV; 665 } 666 667 if (enable) { 668 error = acpi_enable_wakeup_device_power(adev, 669 acpi_target_sleep_state); 670 if (!error) 671 acpi_enable_gpe(adev->wakeup.gpe_device, 672 adev->wakeup.gpe_number, 673 ACPI_GPE_TYPE_WAKE); 674 } else { 675 acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number, 676 ACPI_GPE_TYPE_WAKE); 677 error = acpi_disable_wakeup_device_power(adev); 678 } 679 if (!error) 680 dev_info(dev, "wake-up capability %s by ACPI\n", 681 enable ? "enabled" : "disabled"); 682 683 return error; 684 } 685 #endif 686 687 static void acpi_power_off_prepare(void) 688 { 689 /* Prepare to power off the system */ 690 acpi_sleep_prepare(ACPI_STATE_S5); 691 acpi_disable_all_gpes(); 692 } 693 694 static void acpi_power_off(void) 695 { 696 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 697 printk(KERN_DEBUG "%s called\n", __func__); 698 local_irq_disable(); 699 acpi_enable_wakeup_device(ACPI_STATE_S5); 700 acpi_enter_sleep_state(ACPI_STATE_S5); 701 } 702 703 /* 704 * ACPI 2.0 created the optional _GTS and _BFS, 705 * but industry adoption has been neither rapid nor broad. 706 * 707 * Linux gets into trouble when it executes poorly validated 708 * paths through the BIOS, so disable _GTS and _BFS by default, 709 * but do speak up and offer the option to enable them. 710 */ 711 void __init acpi_gts_bfs_check(void) 712 { 713 acpi_handle dummy; 714 715 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) 716 { 717 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); 718 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " 719 "please notify linux-acpi@vger.kernel.org\n"); 720 } 721 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) 722 { 723 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); 724 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " 725 "please notify linux-acpi@vger.kernel.org\n"); 726 } 727 } 728 729 int __init acpi_sleep_init(void) 730 { 731 acpi_status status; 732 u8 type_a, type_b; 733 #ifdef CONFIG_SUSPEND 734 int i = 0; 735 736 dmi_check_system(acpisleep_dmi_table); 737 #endif 738 739 if (acpi_disabled) 740 return 0; 741 742 sleep_states[ACPI_STATE_S0] = 1; 743 printk(KERN_INFO PREFIX "(supports S0"); 744 745 #ifdef CONFIG_SUSPEND 746 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 747 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 748 if (ACPI_SUCCESS(status)) { 749 sleep_states[i] = 1; 750 printk(" S%d", i); 751 } 752 } 753 754 suspend_set_ops(old_suspend_ordering ? 755 &acpi_suspend_ops_old : &acpi_suspend_ops); 756 #endif 757 758 #ifdef CONFIG_HIBERNATION 759 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 760 if (ACPI_SUCCESS(status)) { 761 hibernation_set_ops(old_suspend_ordering ? 762 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 763 sleep_states[ACPI_STATE_S4] = 1; 764 printk(" S4"); 765 if (!nosigcheck) { 766 acpi_get_table(ACPI_SIG_FACS, 1, 767 (struct acpi_table_header **)&facs); 768 if (facs) 769 s4_hardware_signature = 770 facs->hardware_signature; 771 } 772 } 773 #endif 774 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 775 if (ACPI_SUCCESS(status)) { 776 sleep_states[ACPI_STATE_S5] = 1; 777 printk(" S5"); 778 pm_power_off_prepare = acpi_power_off_prepare; 779 pm_power_off = acpi_power_off; 780 } 781 printk(")\n"); 782 /* 783 * Register the tts_notifier to reboot notifier list so that the _TTS 784 * object can also be evaluated when the system enters S5. 785 */ 786 register_reboot_notifier(&tts_notifier); 787 acpi_gts_bfs_check(); 788 return 0; 789 } 790