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