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 */ 33 bool acpi_no_s5; 34 static u8 sleep_states[ACPI_S_STATE_COUNT]; 35 36 static 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 50 static 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 57 static 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 67 static 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 87 bool 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 99 static u32 acpi_target_sleep_state = ACPI_STATE_S0; 100 101 u32 acpi_target_system_state(void) 102 { 103 return acpi_target_sleep_state; 104 } 105 EXPORT_SYMBOL_GPL(acpi_target_system_state); 106 107 static 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 */ 116 static bool nvs_nosave; 117 118 void __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 */ 131 static bool nvs_nosave_s3; 132 133 void __init acpi_nvs_nosave_s3(void) 134 { 135 nvs_nosave_s3 = true; 136 } 137 138 static 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 */ 149 static bool old_suspend_ordering; 150 151 void __init acpi_old_suspend_ordering(void) 152 { 153 old_suspend_ordering = true; 154 } 155 156 static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 157 { 158 acpi_old_suspend_ordering(); 159 return 0; 160 } 161 162 static int __init init_nvs_nosave(const struct dmi_system_id *d) 163 { 164 acpi_nvs_nosave(); 165 return 0; 166 } 167 168 bool acpi_sleep_default_s3; 169 170 static int __init init_default_s3(const struct dmi_system_id *d) 171 { 172 acpi_sleep_default_s3 = true; 173 return 0; 174 } 175 176 static 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 }; 402 403 static bool ignore_blacklist; 404 405 void __init acpi_sleep_no_blacklist(void) 406 { 407 ignore_blacklist = true; 408 } 409 410 static 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 */ 424 static 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 */ 435 static 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 */ 447 static 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 */ 460 static 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 */ 475 static 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 */ 518 static 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 */ 528 static 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) 543 static inline void acpi_sleep_dmi_check(void) {} 544 #endif /* CONFIG_ACPI_SLEEP */ 545 546 #ifdef CONFIG_SUSPEND 547 static 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 */ 558 static 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 */ 586 static 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 and clear GPE status before interrupt is enabled. Some GPEs 640 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 641 * acpi_leave_sleep_state will reenable specific GPEs later 642 */ 643 acpi_disable_all_gpes(); 644 /* Allow EC transactions to happen. */ 645 acpi_ec_unblock_transactions(); 646 647 suspend_nvs_restore(); 648 649 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 650 } 651 652 static int acpi_suspend_state_valid(suspend_state_t pm_state) 653 { 654 u32 acpi_state; 655 656 switch (pm_state) { 657 case PM_SUSPEND_ON: 658 case PM_SUSPEND_STANDBY: 659 case PM_SUSPEND_MEM: 660 acpi_state = acpi_suspend_states[pm_state]; 661 662 return sleep_states[acpi_state]; 663 default: 664 return 0; 665 } 666 } 667 668 static const struct platform_suspend_ops acpi_suspend_ops = { 669 .valid = acpi_suspend_state_valid, 670 .begin = acpi_suspend_begin, 671 .prepare_late = acpi_pm_prepare, 672 .enter = acpi_suspend_enter, 673 .wake = acpi_pm_finish, 674 .end = acpi_pm_end, 675 }; 676 677 /** 678 * acpi_suspend_begin_old - Set the target system sleep state to the 679 * state associated with given @pm_state, if supported, and 680 * execute the _PTS control method. This function is used if the 681 * pre-ACPI 2.0 suspend ordering has been requested. 682 */ 683 static int acpi_suspend_begin_old(suspend_state_t pm_state) 684 { 685 int error = acpi_suspend_begin(pm_state); 686 if (!error) 687 error = __acpi_pm_prepare(); 688 689 return error; 690 } 691 692 /* 693 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 694 * been requested. 695 */ 696 static const struct platform_suspend_ops acpi_suspend_ops_old = { 697 .valid = acpi_suspend_state_valid, 698 .begin = acpi_suspend_begin_old, 699 .prepare_late = acpi_pm_pre_suspend, 700 .enter = acpi_suspend_enter, 701 .wake = acpi_pm_finish, 702 .end = acpi_pm_end, 703 .recover = acpi_pm_finish, 704 }; 705 706 static bool s2idle_wakeup; 707 708 int acpi_s2idle_begin(void) 709 { 710 acpi_scan_lock_acquire(); 711 return 0; 712 } 713 714 int acpi_s2idle_prepare(void) 715 { 716 if (acpi_sci_irq_valid()) { 717 int error; 718 719 error = enable_irq_wake(acpi_sci_irq); 720 if (error) 721 pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n", 722 acpi_sci_irq, error); 723 724 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE); 725 } 726 727 acpi_enable_wakeup_devices(ACPI_STATE_S0); 728 729 /* Change the configuration of GPEs to avoid spurious wakeup. */ 730 acpi_enable_all_wakeup_gpes(); 731 acpi_os_wait_events_complete(); 732 733 s2idle_wakeup = true; 734 return 0; 735 } 736 737 bool acpi_s2idle_wake(void) 738 { 739 if (!acpi_sci_irq_valid()) 740 return pm_wakeup_pending(); 741 742 while (pm_wakeup_pending()) { 743 /* 744 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the 745 * SCI has not triggered while suspended, so bail out (the 746 * wakeup is pending anyway and the SCI is not the source of 747 * it). 748 */ 749 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) { 750 pm_pr_dbg("Wakeup unrelated to ACPI SCI\n"); 751 return true; 752 } 753 754 /* 755 * If the status bit of any enabled fixed event is set, the 756 * wakeup is regarded as valid. 757 */ 758 if (acpi_any_fixed_event_status_set()) { 759 pm_pr_dbg("ACPI fixed event wakeup\n"); 760 return true; 761 } 762 763 /* Check wakeups from drivers sharing the SCI. */ 764 if (acpi_check_wakeup_handlers()) { 765 pm_pr_dbg("ACPI custom handler wakeup\n"); 766 return true; 767 } 768 769 /* 770 * Check non-EC GPE wakeups and if there are none, cancel the 771 * SCI-related wakeup and dispatch the EC GPE. 772 */ 773 if (acpi_ec_dispatch_gpe()) { 774 pm_pr_dbg("ACPI non-EC GPE wakeup\n"); 775 return true; 776 } 777 778 acpi_os_wait_events_complete(); 779 780 /* 781 * The SCI is in the "suspended" state now and it cannot produce 782 * new wakeup events till the rearming below, so if any of them 783 * are pending here, they must be resulting from the processing 784 * of EC events above or coming from somewhere else. 785 */ 786 if (pm_wakeup_pending()) { 787 pm_pr_dbg("Wakeup after ACPI Notify sync\n"); 788 return true; 789 } 790 791 pm_pr_dbg("Rearming ACPI SCI for wakeup\n"); 792 793 pm_wakeup_clear(acpi_sci_irq); 794 rearm_wake_irq(acpi_sci_irq); 795 } 796 797 return false; 798 } 799 800 void acpi_s2idle_restore(void) 801 { 802 /* 803 * Drain pending events before restoring the working-state configuration 804 * of GPEs. 805 */ 806 acpi_os_wait_events_complete(); /* synchronize GPE processing */ 807 acpi_ec_flush_work(); /* flush the EC driver's workqueues */ 808 acpi_os_wait_events_complete(); /* synchronize Notify handling */ 809 810 s2idle_wakeup = false; 811 812 acpi_enable_all_runtime_gpes(); 813 814 acpi_disable_wakeup_devices(ACPI_STATE_S0); 815 816 if (acpi_sci_irq_valid()) { 817 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE); 818 disable_irq_wake(acpi_sci_irq); 819 } 820 } 821 822 void acpi_s2idle_end(void) 823 { 824 acpi_scan_lock_release(); 825 } 826 827 static const struct platform_s2idle_ops acpi_s2idle_ops = { 828 .begin = acpi_s2idle_begin, 829 .prepare = acpi_s2idle_prepare, 830 .wake = acpi_s2idle_wake, 831 .restore = acpi_s2idle_restore, 832 .end = acpi_s2idle_end, 833 }; 834 835 void __weak acpi_s2idle_setup(void) 836 { 837 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) 838 pr_info("Efficient low-power S0 idle declared\n"); 839 840 s2idle_set_ops(&acpi_s2idle_ops); 841 } 842 843 static void acpi_sleep_suspend_setup(void) 844 { 845 bool suspend_ops_needed = false; 846 int i; 847 848 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) 849 if (acpi_sleep_state_supported(i)) { 850 sleep_states[i] = 1; 851 suspend_ops_needed = true; 852 } 853 854 if (suspend_ops_needed) 855 suspend_set_ops(old_suspend_ordering ? 856 &acpi_suspend_ops_old : &acpi_suspend_ops); 857 858 acpi_s2idle_setup(); 859 } 860 861 #else /* !CONFIG_SUSPEND */ 862 #define s2idle_wakeup (false) 863 static inline void acpi_sleep_suspend_setup(void) {} 864 #endif /* !CONFIG_SUSPEND */ 865 866 bool acpi_s2idle_wakeup(void) 867 { 868 return s2idle_wakeup; 869 } 870 871 #ifdef CONFIG_PM_SLEEP 872 static u32 saved_bm_rld; 873 874 static int acpi_save_bm_rld(void) 875 { 876 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); 877 return 0; 878 } 879 880 static void acpi_restore_bm_rld(void) 881 { 882 u32 resumed_bm_rld = 0; 883 884 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); 885 if (resumed_bm_rld == saved_bm_rld) 886 return; 887 888 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); 889 } 890 891 static struct syscore_ops acpi_sleep_syscore_ops = { 892 .suspend = acpi_save_bm_rld, 893 .resume = acpi_restore_bm_rld, 894 }; 895 896 static void acpi_sleep_syscore_init(void) 897 { 898 register_syscore_ops(&acpi_sleep_syscore_ops); 899 } 900 #else 901 static inline void acpi_sleep_syscore_init(void) {} 902 #endif /* CONFIG_PM_SLEEP */ 903 904 #ifdef CONFIG_HIBERNATION 905 static unsigned long s4_hardware_signature; 906 static struct acpi_table_facs *facs; 907 int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */ 908 909 static int acpi_hibernation_begin(pm_message_t stage) 910 { 911 if (!nvs_nosave) { 912 int error = suspend_nvs_alloc(); 913 if (error) 914 return error; 915 } 916 917 if (stage.event == PM_EVENT_HIBERNATE) 918 pm_set_suspend_via_firmware(); 919 920 acpi_pm_start(ACPI_STATE_S4); 921 return 0; 922 } 923 924 static int acpi_hibernation_enter(void) 925 { 926 acpi_status status = AE_OK; 927 928 /* This shouldn't return. If it returns, we have a problem */ 929 status = acpi_enter_sleep_state(ACPI_STATE_S4); 930 /* Reprogram control registers */ 931 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 932 933 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 934 } 935 936 static void acpi_hibernation_leave(void) 937 { 938 pm_set_resume_via_firmware(); 939 /* 940 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 941 * enable it here. 942 */ 943 acpi_enable(); 944 /* Reprogram control registers */ 945 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 946 /* Check the hardware signature */ 947 if (facs && s4_hardware_signature != facs->hardware_signature) 948 pr_crit("Hardware changed while hibernated, success doubtful!\n"); 949 /* Restore the NVS memory area */ 950 suspend_nvs_restore(); 951 /* Allow EC transactions to happen. */ 952 acpi_ec_unblock_transactions(); 953 } 954 955 static void acpi_pm_thaw(void) 956 { 957 acpi_ec_unblock_transactions(); 958 acpi_enable_all_runtime_gpes(); 959 } 960 961 static const struct platform_hibernation_ops acpi_hibernation_ops = { 962 .begin = acpi_hibernation_begin, 963 .end = acpi_pm_end, 964 .pre_snapshot = acpi_pm_prepare, 965 .finish = acpi_pm_finish, 966 .prepare = acpi_pm_prepare, 967 .enter = acpi_hibernation_enter, 968 .leave = acpi_hibernation_leave, 969 .pre_restore = acpi_pm_freeze, 970 .restore_cleanup = acpi_pm_thaw, 971 }; 972 973 /** 974 * acpi_hibernation_begin_old - Set the target system sleep state to 975 * ACPI_STATE_S4 and execute the _PTS control method. This 976 * function is used if the pre-ACPI 2.0 suspend ordering has been 977 * requested. 978 */ 979 static int acpi_hibernation_begin_old(pm_message_t stage) 980 { 981 int error; 982 /* 983 * The _TTS object should always be evaluated before the _PTS object. 984 * When the old_suspended_ordering is true, the _PTS object is 985 * evaluated in the acpi_sleep_prepare. 986 */ 987 acpi_sleep_tts_switch(ACPI_STATE_S4); 988 989 error = acpi_sleep_prepare(ACPI_STATE_S4); 990 if (error) 991 return error; 992 993 if (!nvs_nosave) { 994 error = suspend_nvs_alloc(); 995 if (error) 996 return error; 997 } 998 999 if (stage.event == PM_EVENT_HIBERNATE) 1000 pm_set_suspend_via_firmware(); 1001 1002 acpi_target_sleep_state = ACPI_STATE_S4; 1003 acpi_scan_lock_acquire(); 1004 return 0; 1005 } 1006 1007 /* 1008 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 1009 * been requested. 1010 */ 1011 static const struct platform_hibernation_ops acpi_hibernation_ops_old = { 1012 .begin = acpi_hibernation_begin_old, 1013 .end = acpi_pm_end, 1014 .pre_snapshot = acpi_pm_pre_suspend, 1015 .prepare = acpi_pm_freeze, 1016 .finish = acpi_pm_finish, 1017 .enter = acpi_hibernation_enter, 1018 .leave = acpi_hibernation_leave, 1019 .pre_restore = acpi_pm_freeze, 1020 .restore_cleanup = acpi_pm_thaw, 1021 .recover = acpi_pm_finish, 1022 }; 1023 1024 static void acpi_sleep_hibernate_setup(void) 1025 { 1026 if (!acpi_sleep_state_supported(ACPI_STATE_S4)) 1027 return; 1028 1029 hibernation_set_ops(old_suspend_ordering ? 1030 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 1031 sleep_states[ACPI_STATE_S4] = 1; 1032 if (!acpi_check_s4_hw_signature) 1033 return; 1034 1035 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); 1036 if (facs) { 1037 /* 1038 * s4_hardware_signature is the local variable which is just 1039 * used to warn about mismatch after we're attempting to 1040 * resume (in violation of the ACPI specification.) 1041 */ 1042 s4_hardware_signature = facs->hardware_signature; 1043 1044 if (acpi_check_s4_hw_signature > 0) { 1045 /* 1046 * If we're actually obeying the ACPI specification 1047 * then the signature is written out as part of the 1048 * swsusp header, in order to allow the boot kernel 1049 * to gracefully decline to resume. 1050 */ 1051 swsusp_hardware_signature = facs->hardware_signature; 1052 } 1053 } 1054 } 1055 #else /* !CONFIG_HIBERNATION */ 1056 static inline void acpi_sleep_hibernate_setup(void) {} 1057 #endif /* !CONFIG_HIBERNATION */ 1058 1059 static int acpi_power_off_prepare(struct sys_off_data *data) 1060 { 1061 /* Prepare to power off the system */ 1062 acpi_sleep_prepare(ACPI_STATE_S5); 1063 acpi_disable_all_gpes(); 1064 acpi_os_wait_events_complete(); 1065 return NOTIFY_DONE; 1066 } 1067 1068 static int acpi_power_off(struct sys_off_data *data) 1069 { 1070 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 1071 pr_debug("%s called\n", __func__); 1072 local_irq_disable(); 1073 acpi_enter_sleep_state(ACPI_STATE_S5); 1074 return NOTIFY_DONE; 1075 } 1076 1077 int __init acpi_sleep_init(void) 1078 { 1079 char supported[ACPI_S_STATE_COUNT * 3 + 1]; 1080 char *pos = supported; 1081 int i; 1082 1083 acpi_sleep_dmi_check(); 1084 1085 sleep_states[ACPI_STATE_S0] = 1; 1086 1087 acpi_sleep_syscore_init(); 1088 acpi_sleep_suspend_setup(); 1089 acpi_sleep_hibernate_setup(); 1090 1091 if (acpi_sleep_state_supported(ACPI_STATE_S5)) { 1092 sleep_states[ACPI_STATE_S5] = 1; 1093 1094 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE, 1095 SYS_OFF_PRIO_FIRMWARE, 1096 acpi_power_off_prepare, NULL); 1097 1098 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, 1099 SYS_OFF_PRIO_FIRMWARE, 1100 acpi_power_off, NULL); 1101 1102 /* 1103 * Windows uses S5 for reboot, so some BIOSes depend on it to 1104 * perform proper reboot. 1105 */ 1106 register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE, 1107 SYS_OFF_PRIO_FIRMWARE, 1108 acpi_power_off_prepare, NULL); 1109 } else { 1110 acpi_no_s5 = true; 1111 } 1112 1113 supported[0] = 0; 1114 for (i = 0; i < ACPI_S_STATE_COUNT; i++) { 1115 if (sleep_states[i]) 1116 pos += sprintf(pos, " S%d", i); 1117 } 1118 pr_info("(supports%s)\n", supported); 1119 1120 /* 1121 * Register the tts_notifier to reboot notifier list so that the _TTS 1122 * object can also be evaluated when the system enters S5. 1123 */ 1124 register_reboot_notifier(&tts_notifier); 1125 return 0; 1126 } 1127