1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * sleep.c - ACPI sleep support. 4 * 5 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> 6 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> 7 * Copyright (c) 2000-2003 Patrick Mochel 8 * Copyright (c) 2003 Open Source Development Lab 9 */ 10 11#define pr_fmt(fmt) "ACPI: PM: " fmt 12 13#include <linux/delay.h> 14#include <linux/irq.h> 15#include <linux/dmi.h> 16#include <linux/device.h> 17#include <linux/interrupt.h> 18#include <linux/suspend.h> 19#include <linux/reboot.h> 20#include <linux/acpi.h> 21#include <linux/module.h> 22#include <linux/syscore_ops.h> 23#include <asm/io.h> 24#include <trace/events/power.h> 25 26#include "internal.h" 27#include "sleep.h" 28 29/* 30 * Some HW-full platforms do not have _S5, so they may need 31 * to leverage efi power off for a shutdown. 32 */ 33bool acpi_no_s5; 34static u8 sleep_states[ACPI_S_STATE_COUNT]; 35 36static void acpi_sleep_tts_switch(u32 acpi_state) 37{ 38 acpi_status status; 39 40 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state); 41 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 42 /* 43 * OS can't evaluate the _TTS object correctly. Some warning 44 * message will be printed. But it won't break anything. 45 */ 46 pr_notice("Failure in evaluating _TTS object\n"); 47 } 48} 49 50static int tts_notify_reboot(struct notifier_block *this, 51 unsigned long code, void *x) 52{ 53 acpi_sleep_tts_switch(ACPI_STATE_S5); 54 return NOTIFY_DONE; 55} 56 57static struct notifier_block tts_notifier = { 58 .notifier_call = tts_notify_reboot, 59 .next = NULL, 60 .priority = 0, 61}; 62 63#ifndef acpi_skip_set_wakeup_address 64#define acpi_skip_set_wakeup_address() false 65#endif 66 67static int acpi_sleep_prepare(u32 acpi_state) 68{ 69#ifdef CONFIG_ACPI_SLEEP 70 unsigned long acpi_wakeup_address; 71 72 /* do we have a wakeup address for S2 and S3? */ 73 if (acpi_state == ACPI_STATE_S3 && !acpi_skip_set_wakeup_address()) { 74 acpi_wakeup_address = acpi_get_wakeup_address(); 75 if (!acpi_wakeup_address) 76 return -EFAULT; 77 acpi_set_waking_vector(acpi_wakeup_address); 78 79 } 80#endif 81 pr_info("Preparing to enter system sleep state S%d\n", acpi_state); 82 acpi_enable_wakeup_devices(acpi_state); 83 acpi_enter_sleep_state_prep(acpi_state); 84 return 0; 85} 86 87bool acpi_sleep_state_supported(u8 sleep_state) 88{ 89 acpi_status status; 90 u8 type_a, type_b; 91 92 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b); 93 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware 94 || (acpi_gbl_FADT.sleep_control.address 95 && acpi_gbl_FADT.sleep_status.address)); 96} 97 98#ifdef CONFIG_ACPI_SLEEP 99static u32 acpi_target_sleep_state = ACPI_STATE_S0; 100 101u32 acpi_target_system_state(void) 102{ 103 return acpi_target_sleep_state; 104} 105EXPORT_SYMBOL_GPL(acpi_target_system_state); 106 107static bool pwr_btn_event_pending; 108 109/* 110 * The ACPI specification wants us to save NVS memory regions during hibernation 111 * and to restore them during the subsequent resume. Windows does that also for 112 * suspend to RAM. However, it is known that this mechanism does not work on 113 * all machines, so we allow the user to disable it with the help of the 114 * 'acpi_sleep=nonvs' kernel command line option. 115 */ 116static bool nvs_nosave; 117 118void __init acpi_nvs_nosave(void) 119{ 120 nvs_nosave = true; 121} 122 123/* 124 * The ACPI specification wants us to save NVS memory regions during hibernation 125 * but says nothing about saving NVS during S3. Not all versions of Windows 126 * save NVS on S3 suspend either, and it is clear that not all systems need 127 * NVS to be saved at S3 time. To improve suspend/resume time, allow the 128 * user to disable saving NVS on S3 if their system does not require it, but 129 * continue to save/restore NVS for S4 as specified. 130 */ 131static bool nvs_nosave_s3; 132 133void __init acpi_nvs_nosave_s3(void) 134{ 135 nvs_nosave_s3 = true; 136} 137 138static int __init init_nvs_save_s3(const struct dmi_system_id *d) 139{ 140 nvs_nosave_s3 = false; 141 return 0; 142} 143 144/* 145 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the 146 * user to request that behavior by using the 'acpi_old_suspend_ordering' 147 * kernel command line option that causes the following variable to be set. 148 */ 149static bool old_suspend_ordering; 150 151void __init acpi_old_suspend_ordering(void) 152{ 153 old_suspend_ordering = true; 154} 155 156static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 157{ 158 acpi_old_suspend_ordering(); 159 return 0; 160} 161 162static int __init init_nvs_nosave(const struct dmi_system_id *d) 163{ 164 acpi_nvs_nosave(); 165 return 0; 166} 167 168bool acpi_sleep_default_s3; 169 170static int __init init_default_s3(const struct dmi_system_id *d) 171{ 172 acpi_sleep_default_s3 = true; 173 return 0; 174} 175 176static const struct dmi_system_id acpisleep_dmi_table[] __initconst = { 177 { 178 .callback = init_old_suspend_ordering, 179 .ident = "Abit KN9 (nForce4 variant)", 180 .matches = { 181 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 182 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 183 }, 184 }, 185 { 186 .callback = init_old_suspend_ordering, 187 .ident = "HP xw4600 Workstation", 188 .matches = { 189 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 190 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 191 }, 192 }, 193 { 194 .callback = init_old_suspend_ordering, 195 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 196 .matches = { 197 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 198 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 199 }, 200 }, 201 { 202 .callback = init_old_suspend_ordering, 203 .ident = "Panasonic CF51-2L", 204 .matches = { 205 DMI_MATCH(DMI_BOARD_VENDOR, 206 "Matsushita Electric Industrial Co.,Ltd."), 207 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 208 }, 209 }, 210 { 211 .callback = init_nvs_nosave, 212 .ident = "Sony Vaio VGN-FW41E_H", 213 .matches = { 214 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 215 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), 216 }, 217 }, 218 { 219 .callback = init_nvs_nosave, 220 .ident = "Sony Vaio VGN-FW21E", 221 .matches = { 222 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 223 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), 224 }, 225 }, 226 { 227 .callback = init_nvs_nosave, 228 .ident = "Sony Vaio VGN-FW21M", 229 .matches = { 230 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 231 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), 232 }, 233 }, 234 { 235 .callback = init_nvs_nosave, 236 .ident = "Sony Vaio VPCEB17FX", 237 .matches = { 238 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 239 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), 240 }, 241 }, 242 { 243 .callback = init_nvs_nosave, 244 .ident = "Sony Vaio VGN-SR11M", 245 .matches = { 246 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 247 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), 248 }, 249 }, 250 { 251 .callback = init_nvs_nosave, 252 .ident = "Everex StepNote Series", 253 .matches = { 254 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), 255 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), 256 }, 257 }, 258 { 259 .callback = init_nvs_nosave, 260 .ident = "Sony Vaio VPCEB1Z1E", 261 .matches = { 262 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 263 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), 264 }, 265 }, 266 { 267 .callback = init_nvs_nosave, 268 .ident = "Sony Vaio VGN-NW130D", 269 .matches = { 270 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 271 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), 272 }, 273 }, 274 { 275 .callback = init_nvs_nosave, 276 .ident = "Sony Vaio VPCCW29FX", 277 .matches = { 278 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 279 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), 280 }, 281 }, 282 { 283 .callback = init_nvs_nosave, 284 .ident = "Averatec AV1020-ED2", 285 .matches = { 286 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), 287 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), 288 }, 289 }, 290 { 291 .callback = init_old_suspend_ordering, 292 .ident = "Asus A8N-SLI DELUXE", 293 .matches = { 294 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 295 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), 296 }, 297 }, 298 { 299 .callback = init_old_suspend_ordering, 300 .ident = "Asus A8N-SLI Premium", 301 .matches = { 302 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 303 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), 304 }, 305 }, 306 { 307 .callback = init_nvs_nosave, 308 .ident = "Sony Vaio VGN-SR26GN_P", 309 .matches = { 310 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 311 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), 312 }, 313 }, 314 { 315 .callback = init_nvs_nosave, 316 .ident = "Sony Vaio VPCEB1S1E", 317 .matches = { 318 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 319 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), 320 }, 321 }, 322 { 323 .callback = init_nvs_nosave, 324 .ident = "Sony Vaio VGN-FW520F", 325 .matches = { 326 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 327 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), 328 }, 329 }, 330 { 331 .callback = init_nvs_nosave, 332 .ident = "Asus K54C", 333 .matches = { 334 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 335 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), 336 }, 337 }, 338 { 339 .callback = init_nvs_nosave, 340 .ident = "Asus K54HR", 341 .matches = { 342 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 343 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), 344 }, 345 }, 346 { 347 .callback = init_nvs_save_s3, 348 .ident = "Asus 1025C", 349 .matches = { 350 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 351 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"), 352 }, 353 }, 354 /* 355 * https://bugzilla.kernel.org/show_bug.cgi?id=189431 356 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory 357 * saving during S3. 358 */ 359 { 360 .callback = init_nvs_save_s3, 361 .ident = "Lenovo G50-45", 362 .matches = { 363 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 364 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"), 365 }, 366 }, 367 { 368 .callback = init_nvs_save_s3, 369 .ident = "Lenovo G40-45", 370 .matches = { 371 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 372 DMI_MATCH(DMI_PRODUCT_NAME, "80E1"), 373 }, 374 }, 375 /* 376 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using 377 * the Low Power S0 Idle firmware interface (see 378 * https://bugzilla.kernel.org/show_bug.cgi?id=199057). 379 */ 380 { 381 .callback = init_default_s3, 382 .ident = "ThinkPad X1 Tablet(2016)", 383 .matches = { 384 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 385 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"), 386 }, 387 }, 388 /* 389 * ASUS B1400CEAE hangs on resume from suspend (see 390 * https://bugzilla.kernel.org/show_bug.cgi?id=215742). 391 */ 392 { 393 .callback = init_default_s3, 394 .ident = "ASUS B1400CEAE", 395 .matches = { 396 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 397 DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"), 398 }, 399 }, 400 {}, 401}; 402 403static bool ignore_blacklist; 404 405void __init acpi_sleep_no_blacklist(void) 406{ 407 ignore_blacklist = true; 408} 409 410static void __init acpi_sleep_dmi_check(void) 411{ 412 if (ignore_blacklist) 413 return; 414 415 if (dmi_get_bios_year() >= 2012) 416 acpi_nvs_nosave_s3(); 417 418 dmi_check_system(acpisleep_dmi_table); 419} 420 421/** 422 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. 423 */ 424static int acpi_pm_freeze(void) 425{ 426 acpi_disable_all_gpes(); 427 acpi_os_wait_events_complete(); 428 acpi_ec_block_transactions(); 429 return 0; 430} 431 432/** 433 * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. 434 */ 435static int acpi_pm_pre_suspend(void) 436{ 437 acpi_pm_freeze(); 438 return suspend_nvs_save(); 439} 440 441/** 442 * __acpi_pm_prepare - Prepare the platform to enter the target state. 443 * 444 * If necessary, set the firmware waking vector and do arch-specific 445 * nastiness to get the wakeup code to the waking vector. 446 */ 447static int __acpi_pm_prepare(void) 448{ 449 int error = acpi_sleep_prepare(acpi_target_sleep_state); 450 if (error) 451 acpi_target_sleep_state = ACPI_STATE_S0; 452 453 return error; 454} 455 456/** 457 * acpi_pm_prepare - Prepare the platform to enter the target sleep 458 * state and disable the GPEs. 459 */ 460static int acpi_pm_prepare(void) 461{ 462 int error = __acpi_pm_prepare(); 463 if (!error) 464 error = acpi_pm_pre_suspend(); 465 466 return error; 467} 468 469/** 470 * acpi_pm_finish - Instruct the platform to leave a sleep state. 471 * 472 * This is called after we wake back up (or if entering the sleep state 473 * failed). 474 */ 475static void acpi_pm_finish(void) 476{ 477 struct acpi_device *pwr_btn_adev; 478 u32 acpi_state = acpi_target_sleep_state; 479 480 acpi_ec_unblock_transactions(); 481 suspend_nvs_free(); 482 483 if (acpi_state == ACPI_STATE_S0) 484 return; 485 486 pr_info("Waking up from system sleep state S%d\n", acpi_state); 487 acpi_disable_wakeup_devices(acpi_state); 488 acpi_leave_sleep_state(acpi_state); 489 490 /* reset firmware waking vector */ 491 acpi_set_waking_vector(0); 492 493 acpi_target_sleep_state = ACPI_STATE_S0; 494 495 acpi_resume_power_resources(); 496 497 /* If we were woken with the fixed power button, provide a small 498 * hint to userspace in the form of a wakeup event on the fixed power 499 * button device (if it can be found). 500 * 501 * We delay the event generation til now, as the PM layer requires 502 * timekeeping to be running before we generate events. */ 503 if (!pwr_btn_event_pending) 504 return; 505 506 pwr_btn_event_pending = false; 507 pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF, 508 NULL, -1); 509 if (pwr_btn_adev) { 510 pm_wakeup_event(&pwr_btn_adev->dev, 0); 511 acpi_dev_put(pwr_btn_adev); 512 } 513} 514 515/** 516 * acpi_pm_start - Start system PM transition. 517 */ 518static void acpi_pm_start(u32 acpi_state) 519{ 520 acpi_target_sleep_state = acpi_state; 521 acpi_sleep_tts_switch(acpi_target_sleep_state); 522 acpi_scan_lock_acquire(); 523} 524 525/** 526 * acpi_pm_end - Finish up system PM transition. 527 */ 528static void acpi_pm_end(void) 529{ 530 acpi_turn_off_unused_power_resources(); 531 acpi_scan_lock_release(); 532 /* 533 * This is necessary in case acpi_pm_finish() is not called during a 534 * failing transition to a sleep state. 535 */ 536 acpi_target_sleep_state = ACPI_STATE_S0; 537 acpi_sleep_tts_switch(acpi_target_sleep_state); 538} 539#else /* !CONFIG_ACPI_SLEEP */ 540#define sleep_no_lps0 (1) 541#define acpi_target_sleep_state ACPI_STATE_S0 542#define acpi_sleep_default_s3 (1) 543static inline void acpi_sleep_dmi_check(void) {} 544#endif /* CONFIG_ACPI_SLEEP */ 545 546#ifdef CONFIG_SUSPEND 547static u32 acpi_suspend_states[] = { 548 [PM_SUSPEND_ON] = ACPI_STATE_S0, 549 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 550 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 551 [PM_SUSPEND_MAX] = ACPI_STATE_S5 552}; 553 554/** 555 * acpi_suspend_begin - Set the target system sleep state to the state 556 * associated with given @pm_state, if supported. 557 */ 558static int acpi_suspend_begin(suspend_state_t pm_state) 559{ 560 u32 acpi_state = acpi_suspend_states[pm_state]; 561 int error; 562 563 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); 564 if (error) 565 return error; 566 567 if (!sleep_states[acpi_state]) { 568 pr_err("ACPI does not support sleep state S%u\n", acpi_state); 569 return -ENOSYS; 570 } 571 if (acpi_state > ACPI_STATE_S1) 572 pm_set_suspend_via_firmware(); 573 574 acpi_pm_start(acpi_state); 575 return 0; 576} 577 578/** 579 * acpi_suspend_enter - Actually enter a sleep state. 580 * @pm_state: ignored 581 * 582 * Flush caches and go to sleep. For STR we have to call arch-specific 583 * assembly, which in turn call acpi_enter_sleep_state(). 584 * It's unfortunate, but it works. Please fix if you're feeling frisky. 585 */ 586static int acpi_suspend_enter(suspend_state_t pm_state) 587{ 588 acpi_status status = AE_OK; 589 u32 acpi_state = acpi_target_sleep_state; 590 int error; 591 592 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); 593 switch (acpi_state) { 594 case ACPI_STATE_S1: 595 barrier(); 596 status = acpi_enter_sleep_state(acpi_state); 597 break; 598 599 case ACPI_STATE_S3: 600 if (!acpi_suspend_lowlevel) 601 return -ENOSYS; 602 error = acpi_suspend_lowlevel(); 603 if (error) 604 return error; 605 pr_info("Low-level resume complete\n"); 606 pm_set_resume_via_firmware(); 607 break; 608 } 609 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false); 610 611 /* This violates the spec but is required for bug compatibility. */ 612 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); 613 614 /* Reprogram control registers */ 615 acpi_leave_sleep_state_prep(acpi_state); 616 617 /* ACPI 3.0 specs (P62) says that it's the responsibility 618 * of the OSPM to clear the status bit [ implying that the 619 * POWER_BUTTON event should not reach userspace ] 620 * 621 * However, we do generate a small hint for userspace in the form of 622 * a wakeup event. We flag this condition for now and generate the 623 * event later, as we're currently too early in resume to be able to 624 * generate wakeup events. 625 */ 626 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { 627 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED; 628 629 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); 630 631 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) { 632 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 633 /* Flag for later */ 634 pwr_btn_event_pending = true; 635 } 636 } 637 638 /* 639 * Disable all GPE and clear their status bits before interrupts are 640 * enabled. Some GPEs (like wakeup GPEs) have no handlers and this can 641 * prevent them from producing spurious interrups. 642 * 643 * acpi_leave_sleep_state() will reenable specific GPEs later. 644 * 645 * Because this code runs on one CPU with disabled interrupts (all of 646 * the other CPUs are offline at this time), it need not acquire any 647 * sleeping locks which may trigger an implicit preemption point even 648 * if there is no contention, so avoid doing that by using a low-level 649 * library routine here. 650 */ 651 acpi_hw_disable_all_gpes(); 652 /* Allow EC transactions to happen. */ 653 acpi_ec_unblock_transactions(); 654 655 suspend_nvs_restore(); 656 657 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 658} 659 660static int acpi_suspend_state_valid(suspend_state_t pm_state) 661{ 662 u32 acpi_state; 663 664 switch (pm_state) { 665 case PM_SUSPEND_ON: 666 case PM_SUSPEND_STANDBY: 667 case PM_SUSPEND_MEM: 668 acpi_state = acpi_suspend_states[pm_state]; 669 670 return sleep_states[acpi_state]; 671 default: 672 return 0; 673 } 674} 675 676static const struct platform_suspend_ops acpi_suspend_ops = { 677 .valid = acpi_suspend_state_valid, 678 .begin = acpi_suspend_begin, 679 .prepare_late = acpi_pm_prepare, 680 .enter = acpi_suspend_enter, 681 .wake = acpi_pm_finish, 682 .end = acpi_pm_end, 683}; 684 685/** 686 * acpi_suspend_begin_old - Set the target system sleep state to the 687 * state associated with given @pm_state, if supported, and 688 * execute the _PTS control method. This function is used if the 689 * pre-ACPI 2.0 suspend ordering has been requested. 690 */ 691static int acpi_suspend_begin_old(suspend_state_t pm_state) 692{ 693 int error = acpi_suspend_begin(pm_state); 694 if (!error) 695 error = __acpi_pm_prepare(); 696 697 return error; 698} 699 700/* 701 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 702 * been requested. 703 */ 704static const struct platform_suspend_ops acpi_suspend_ops_old = { 705 .valid = acpi_suspend_state_valid, 706 .begin = acpi_suspend_begin_old, 707 .prepare_late = acpi_pm_pre_suspend, 708 .enter = acpi_suspend_enter, 709 .wake = acpi_pm_finish, 710 .end = acpi_pm_end, 711 .recover = acpi_pm_finish, 712}; 713 714static bool s2idle_wakeup; 715 716int acpi_s2idle_begin(void) 717{ 718 acpi_scan_lock_acquire(); 719 return 0; 720} 721 722int acpi_s2idle_prepare(void) 723{ 724 if (acpi_sci_irq_valid()) { 725 int error; 726 727 error = enable_irq_wake(acpi_sci_irq); 728 if (error) 729 pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n", 730 acpi_sci_irq, error); 731 732 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE); 733 } 734 735 acpi_enable_wakeup_devices(ACPI_STATE_S0); 736 737 /* Change the configuration of GPEs to avoid spurious wakeup. */ 738 acpi_enable_all_wakeup_gpes(); 739 acpi_os_wait_events_complete(); 740 741 s2idle_wakeup = true; 742 return 0; 743} 744 745bool acpi_s2idle_wake(void) 746{ 747 if (!acpi_sci_irq_valid()) 748 return pm_wakeup_pending(); 749 750 while (pm_wakeup_pending()) { 751 /* 752 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the 753 * SCI has not triggered while suspended, so bail out (the 754 * wakeup is pending anyway and the SCI is not the source of 755 * it). 756 */ 757 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) { 758 pm_pr_dbg("Wakeup unrelated to ACPI SCI\n"); 759 return true; 760 } 761 762 /* 763 * If the status bit of any enabled fixed event is set, the 764 * wakeup is regarded as valid. 765 */ 766 if (acpi_any_fixed_event_status_set()) { 767 pm_pr_dbg("ACPI fixed event wakeup\n"); 768 return true; 769 } 770 771 /* Check wakeups from drivers sharing the SCI. */ 772 if (acpi_check_wakeup_handlers()) { 773 pm_pr_dbg("ACPI custom handler wakeup\n"); 774 return true; 775 } 776 777 /* 778 * Check non-EC GPE wakeups and if there are none, cancel the 779 * SCI-related wakeup and dispatch the EC GPE. 780 */ 781 if (acpi_ec_dispatch_gpe()) { 782 pm_pr_dbg("ACPI non-EC GPE wakeup\n"); 783 return true; 784 } 785 786 acpi_os_wait_events_complete(); 787 788 /* 789 * The SCI is in the "suspended" state now and it cannot produce 790 * new wakeup events till the rearming below, so if any of them 791 * are pending here, they must be resulting from the processing 792 * of EC events above or coming from somewhere else. 793 */ 794 if (pm_wakeup_pending()) { 795 pm_pr_dbg("Wakeup after ACPI Notify sync\n"); 796 return true; 797 } 798 799 pm_pr_dbg("Rearming ACPI SCI for wakeup\n"); 800 801 pm_wakeup_clear(acpi_sci_irq); 802 rearm_wake_irq(acpi_sci_irq); 803 } 804 805 return false; 806} 807 808void acpi_s2idle_restore(void) 809{ 810 /* 811 * Drain pending events before restoring the working-state configuration 812 * of GPEs. 813 */ 814 acpi_os_wait_events_complete(); /* synchronize GPE processing */ 815 acpi_ec_flush_work(); /* flush the EC driver's workqueues */ 816 acpi_os_wait_events_complete(); /* synchronize Notify handling */ 817 818 s2idle_wakeup = false; 819 820 acpi_enable_all_runtime_gpes(); 821 822 acpi_disable_wakeup_devices(ACPI_STATE_S0); 823 824 if (acpi_sci_irq_valid()) { 825 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE); 826 disable_irq_wake(acpi_sci_irq); 827 } 828} 829 830void acpi_s2idle_end(void) 831{ 832 acpi_scan_lock_release(); 833} 834 835static const struct platform_s2idle_ops acpi_s2idle_ops = { 836 .begin = acpi_s2idle_begin, 837 .prepare = acpi_s2idle_prepare, 838 .wake = acpi_s2idle_wake, 839 .restore = acpi_s2idle_restore, 840 .end = acpi_s2idle_end, 841}; 842 843void __weak acpi_s2idle_setup(void) 844{ 845 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) 846 pr_info("Efficient low-power S0 idle declared\n"); 847 848 s2idle_set_ops(&acpi_s2idle_ops); 849} 850 851static void __init acpi_sleep_suspend_setup(void) 852{ 853 bool suspend_ops_needed = false; 854 int i; 855 856 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) 857 if (acpi_sleep_state_supported(i)) { 858 sleep_states[i] = 1; 859 suspend_ops_needed = true; 860 } 861 862 if (suspend_ops_needed) 863 suspend_set_ops(old_suspend_ordering ? 864 &acpi_suspend_ops_old : &acpi_suspend_ops); 865 866 acpi_s2idle_setup(); 867} 868 869#else /* !CONFIG_SUSPEND */ 870#define s2idle_wakeup (false) 871static inline void acpi_sleep_suspend_setup(void) {} 872#endif /* !CONFIG_SUSPEND */ 873 874bool acpi_s2idle_wakeup(void) 875{ 876 return s2idle_wakeup; 877} 878 879#ifdef CONFIG_PM_SLEEP 880static u32 saved_bm_rld; 881 882static int acpi_save_bm_rld(void) 883{ 884 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); 885 return 0; 886} 887 888static void acpi_restore_bm_rld(void) 889{ 890 u32 resumed_bm_rld = 0; 891 892 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); 893 if (resumed_bm_rld == saved_bm_rld) 894 return; 895 896 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); 897} 898 899static struct syscore_ops acpi_sleep_syscore_ops = { 900 .suspend = acpi_save_bm_rld, 901 .resume = acpi_restore_bm_rld, 902}; 903 904static void acpi_sleep_syscore_init(void) 905{ 906 register_syscore_ops(&acpi_sleep_syscore_ops); 907} 908#else 909static inline void acpi_sleep_syscore_init(void) {} 910#endif /* CONFIG_PM_SLEEP */ 911 912#ifdef CONFIG_HIBERNATION 913static unsigned long s4_hardware_signature; 914static struct acpi_table_facs *facs; 915int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */ 916 917static int acpi_hibernation_begin(pm_message_t stage) 918{ 919 if (!nvs_nosave) { 920 int error = suspend_nvs_alloc(); 921 if (error) 922 return error; 923 } 924 925 if (stage.event == PM_EVENT_HIBERNATE) 926 pm_set_suspend_via_firmware(); 927 928 acpi_pm_start(ACPI_STATE_S4); 929 return 0; 930} 931 932static int acpi_hibernation_enter(void) 933{ 934 acpi_status status = AE_OK; 935 936 /* This shouldn't return. If it returns, we have a problem */ 937 status = acpi_enter_sleep_state(ACPI_STATE_S4); 938 /* Reprogram control registers */ 939 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 940 941 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 942} 943 944static void acpi_hibernation_leave(void) 945{ 946 pm_set_resume_via_firmware(); 947 /* 948 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 949 * enable it here. 950 */ 951 acpi_enable(); 952 /* Reprogram control registers */ 953 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 954 /* Check the hardware signature */ 955 if (facs && s4_hardware_signature != facs->hardware_signature) 956 pr_crit("Hardware changed while hibernated, success doubtful!\n"); 957 /* Restore the NVS memory area */ 958 suspend_nvs_restore(); 959 /* Allow EC transactions to happen. */ 960 acpi_ec_unblock_transactions(); 961} 962 963static void acpi_pm_thaw(void) 964{ 965 acpi_ec_unblock_transactions(); 966 acpi_enable_all_runtime_gpes(); 967} 968 969static const struct platform_hibernation_ops acpi_hibernation_ops = { 970 .begin = acpi_hibernation_begin, 971 .end = acpi_pm_end, 972 .pre_snapshot = acpi_pm_prepare, 973 .finish = acpi_pm_finish, 974 .prepare = acpi_pm_prepare, 975 .enter = acpi_hibernation_enter, 976 .leave = acpi_hibernation_leave, 977 .pre_restore = acpi_pm_freeze, 978 .restore_cleanup = acpi_pm_thaw, 979}; 980 981/** 982 * acpi_hibernation_begin_old - Set the target system sleep state to 983 * ACPI_STATE_S4 and execute the _PTS control method. This 984 * function is used if the pre-ACPI 2.0 suspend ordering has been 985 * requested. 986 */ 987static int acpi_hibernation_begin_old(pm_message_t stage) 988{ 989 int error; 990 /* 991 * The _TTS object should always be evaluated before the _PTS object. 992 * When the old_suspended_ordering is true, the _PTS object is 993 * evaluated in the acpi_sleep_prepare. 994 */ 995 acpi_sleep_tts_switch(ACPI_STATE_S4); 996 997 error = acpi_sleep_prepare(ACPI_STATE_S4); 998 if (error) 999 return error; 1000 1001 if (!nvs_nosave) { 1002 error = suspend_nvs_alloc(); 1003 if (error) 1004 return error; 1005 } 1006 1007 if (stage.event == PM_EVENT_HIBERNATE) 1008 pm_set_suspend_via_firmware(); 1009 1010 acpi_target_sleep_state = ACPI_STATE_S4; 1011 acpi_scan_lock_acquire(); 1012 return 0; 1013} 1014 1015/* 1016 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 1017 * been requested. 1018 */ 1019static const struct platform_hibernation_ops acpi_hibernation_ops_old = { 1020 .begin = acpi_hibernation_begin_old, 1021 .end = acpi_pm_end, 1022 .pre_snapshot = acpi_pm_pre_suspend, 1023 .prepare = acpi_pm_freeze, 1024 .finish = acpi_pm_finish, 1025 .enter = acpi_hibernation_enter, 1026 .leave = acpi_hibernation_leave, 1027 .pre_restore = acpi_pm_freeze, 1028 .restore_cleanup = acpi_pm_thaw, 1029 .recover = acpi_pm_finish, 1030}; 1031 1032static void acpi_sleep_hibernate_setup(void) 1033{ 1034 if (!acpi_sleep_state_supported(ACPI_STATE_S4)) 1035 return; 1036 1037 hibernation_set_ops(old_suspend_ordering ? 1038 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 1039 sleep_states[ACPI_STATE_S4] = 1; 1040 if (!acpi_check_s4_hw_signature) 1041 return; 1042 1043 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); 1044 if (facs) { 1045 /* 1046 * s4_hardware_signature is the local variable which is just 1047 * used to warn about mismatch after we're attempting to 1048 * resume (in violation of the ACPI specification.) 1049 */ 1050 s4_hardware_signature = facs->hardware_signature; 1051 1052 if (acpi_check_s4_hw_signature > 0) { 1053 /* 1054 * If we're actually obeying the ACPI specification 1055 * then the signature is written out as part of the 1056 * swsusp header, in order to allow the boot kernel 1057 * to gracefully decline to resume. 1058 */ 1059 swsusp_hardware_signature = facs->hardware_signature; 1060 } 1061 } 1062} 1063#else /* !CONFIG_HIBERNATION */ 1064static inline void acpi_sleep_hibernate_setup(void) {} 1065#endif /* !CONFIG_HIBERNATION */ 1066 1067static int acpi_power_off_prepare(struct sys_off_data *data) 1068{ 1069 /* Prepare to power off the system */ 1070 acpi_sleep_prepare(ACPI_STATE_S5); 1071 acpi_disable_all_gpes(); 1072 acpi_os_wait_events_complete(); 1073 return NOTIFY_DONE; 1074} 1075 1076static int acpi_power_off(struct sys_off_data *data) 1077{ 1078 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 1079 pr_debug("%s called\n", __func__); 1080 local_irq_disable(); 1081 acpi_enter_sleep_state(ACPI_STATE_S5); 1082 return NOTIFY_DONE; 1083} 1084 1085int __init acpi_sleep_init(void) 1086{ 1087 char supported[ACPI_S_STATE_COUNT * 3 + 1]; 1088 char *pos = supported; 1089 int i; 1090 1091 acpi_sleep_dmi_check(); 1092 1093 sleep_states[ACPI_STATE_S0] = 1; 1094 1095 acpi_sleep_syscore_init(); 1096 acpi_sleep_suspend_setup(); 1097 acpi_sleep_hibernate_setup(); 1098 1099 if (acpi_sleep_state_supported(ACPI_STATE_S5)) { 1100 sleep_states[ACPI_STATE_S5] = 1; 1101 1102 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE, 1103 SYS_OFF_PRIO_FIRMWARE, 1104 acpi_power_off_prepare, NULL); 1105 1106 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, 1107 SYS_OFF_PRIO_FIRMWARE, 1108 acpi_power_off, NULL); 1109 1110 /* 1111 * Windows uses S5 for reboot, so some BIOSes depend on it to 1112 * perform proper reboot. 1113 */ 1114 register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE, 1115 SYS_OFF_PRIO_FIRMWARE, 1116 acpi_power_off_prepare, NULL); 1117 } else { 1118 acpi_no_s5 = true; 1119 } 1120 1121 supported[0] = 0; 1122 for (i = 0; i < ACPI_S_STATE_COUNT; i++) { 1123 if (sleep_states[i]) 1124 pos += sprintf(pos, " S%d", i); 1125 } 1126 pr_info("(supports%s)\n", supported); 1127 1128 /* 1129 * Register the tts_notifier to reboot notifier list so that the _TTS 1130 * object can also be evaluated when the system enters S5. 1131 */ 1132 register_reboot_notifier(&tts_notifier); 1133 return 0; 1134} 1135