drivers/acpi/sleep.c

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