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 #include <linux/delay.h>
  12 #include <linux/irq.h>
  13 #include <linux/dmi.h>
  14 #include <linux/device.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/suspend.h>
  17 #include <linux/reboot.h>
  18 #include <linux/acpi.h>
  19 #include <linux/module.h>
  20 #include <linux/syscore_ops.h>
  21 #include <asm/io.h>
  22 #include <trace/events/power.h>
  23
  24 #include "internal.h"
  25 #include "sleep.h"
  26
  27 /*
  28  * Some HW-full platforms do not have _S5, so they may need
  29  * to leverage efi power off for a shutdown.
  30  */
  31 bool acpi_no_s5;
  32 static u8 sleep_states[ACPI_S_STATE_COUNT];
  33
  34 static void acpi_sleep_tts_switch(u32 acpi_state)
  35 {
  36         acpi_status status;
  37
  38         status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
  39         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  40                 /*
  41                  * OS can't evaluate the _TTS object correctly. Some warning
  42                  * message will be printed. But it won't break anything.
  43                  */
  44                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  45         }
  46 }
  47
  48 static int tts_notify_reboot(struct notifier_block *this,
  49                         unsigned long code, void *x)
  50 {
  51         acpi_sleep_tts_switch(ACPI_STATE_S5);
  52         return NOTIFY_DONE;
  53 }
  54
  55 static struct notifier_block tts_notifier = {
  56         .notifier_call  = tts_notify_reboot,
  57         .next           = NULL,
  58         .priority       = 0,
  59 };
  60
  61 static int acpi_sleep_prepare(u32 acpi_state)
  62 {
  63 #ifdef CONFIG_ACPI_SLEEP
  64         unsigned long acpi_wakeup_address;
  65
  66         /* do we have a wakeup address for S2 and S3? */
  67         if (acpi_state == ACPI_STATE_S3) {
  68                 acpi_wakeup_address = acpi_get_wakeup_address();
  69                 if (!acpi_wakeup_address)
  70                         return -EFAULT;
  71                 acpi_set_waking_vector(acpi_wakeup_address);
  72
  73         }
  74         ACPI_FLUSH_CPU_CACHE();
  75 #endif
  76         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  77                 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_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         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 463                 acpi_state);
 464         acpi_disable_wakeup_devices(acpi_state);
 465         acpi_leave_sleep_state(acpi_state);
 466
 467         /* reset firmware waking vector */
 468         acpi_set_waking_vector(0);
 469
 470         acpi_target_sleep_state = ACPI_STATE_S0;
 471
 472         acpi_resume_power_resources();
 473
 474         /* If we were woken with the fixed power button, provide a small
 475          * hint to userspace in the form of a wakeup event on the fixed power
 476          * button device (if it can be found).
 477          *
 478          * We delay the event generation til now, as the PM layer requires
 479          * timekeeping to be running before we generate events. */
 480         if (!pwr_btn_event_pending)
 481                 return;
 482
 483         pwr_btn_event_pending = false;
 484         pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
 485                                                     NULL, -1);
 486         if (pwr_btn_adev) {
 487                 pm_wakeup_event(&pwr_btn_adev->dev, 0);
 488                 acpi_dev_put(pwr_btn_adev);
 489         }
 490 }
 491
 492 /**
 493  * acpi_pm_start - Start system PM transition.
 494  */
 495 static void acpi_pm_start(u32 acpi_state)
 496 {
 497         acpi_target_sleep_state = acpi_state;
 498         acpi_sleep_tts_switch(acpi_target_sleep_state);
 499         acpi_scan_lock_acquire();
 500 }
 501
 502 /**
 503  * acpi_pm_end - Finish up system PM transition.
 504  */
 505 static void acpi_pm_end(void)
 506 {
 507         acpi_turn_off_unused_power_resources(false);
 508         acpi_scan_lock_release();
 509         /*
 510          * This is necessary in case acpi_pm_finish() is not called during a
 511          * failing transition to a sleep state.
 512          */
 513         acpi_target_sleep_state = ACPI_STATE_S0;
 514         acpi_sleep_tts_switch(acpi_target_sleep_state);
 515 }
 516 #else /* !CONFIG_ACPI_SLEEP */
 517 #define sleep_no_lps0   (1)
 518 #define acpi_target_sleep_state ACPI_STATE_S0
 519 #define acpi_sleep_default_s3   (1)
 520 static inline void acpi_sleep_dmi_check(void) {}
 521 #endif /* CONFIG_ACPI_SLEEP */
 522
 523 #ifdef CONFIG_SUSPEND
 524 static u32 acpi_suspend_states[] = {
 525         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 526         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 527         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 528         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 529 };
 530
 531 /**
 532  *      acpi_suspend_begin - Set the target system sleep state to the state
 533  *              associated with given @pm_state, if supported.
 534  */
 535 static int acpi_suspend_begin(suspend_state_t pm_state)
 536 {
 537         u32 acpi_state = acpi_suspend_states[pm_state];
 538         int error;
 539
 540         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 541         if (error)
 542                 return error;
 543
 544         if (!sleep_states[acpi_state]) {
 545                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 546                 return -ENOSYS;
 547         }
 548         if (acpi_state > ACPI_STATE_S1)
 549                 pm_set_suspend_via_firmware();
 550
 551         acpi_pm_start(acpi_state);
 552         return 0;
 553 }
 554
 555 /**
 556  *      acpi_suspend_enter - Actually enter a sleep state.
 557  *      @pm_state: ignored
 558  *
 559  *      Flush caches and go to sleep. For STR we have to call arch-specific
 560  *      assembly, which in turn call acpi_enter_sleep_state().
 561  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 562  */
 563 static int acpi_suspend_enter(suspend_state_t pm_state)
 564 {
 565         acpi_status status = AE_OK;
 566         u32 acpi_state = acpi_target_sleep_state;
 567         int error;
 568
 569         ACPI_FLUSH_CPU_CACHE();
 570
 571         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 572         switch (acpi_state) {
 573         case ACPI_STATE_S1:
 574                 barrier();
 575                 status = acpi_enter_sleep_state(acpi_state);
 576                 break;
 577
 578         case ACPI_STATE_S3:
 579                 if (!acpi_suspend_lowlevel)
 580                         return -ENOSYS;
 581                 error = acpi_suspend_lowlevel();
 582                 if (error)
 583                         return error;
 584                 pr_info(PREFIX "Low-level resume complete\n");
 585                 pm_set_resume_via_firmware();
 586                 break;
 587         }
 588         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 589
 590         /* This violates the spec but is required for bug compatibility. */
 591         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 592
 593         /* Reprogram control registers */
 594         acpi_leave_sleep_state_prep(acpi_state);
 595
 596         /* ACPI 3.0 specs (P62) says that it's the responsibility
 597          * of the OSPM to clear the status bit [ implying that the
 598          * POWER_BUTTON event should not reach userspace ]
 599          *
 600          * However, we do generate a small hint for userspace in the form of
 601          * a wakeup event. We flag this condition for now and generate the
 602          * event later, as we're currently too early in resume to be able to
 603          * generate wakeup events.
 604          */
 605         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 606                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 607
 608                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 609
 610                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 611                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 612                         /* Flag for later */
 613                         pwr_btn_event_pending = true;
 614                 }
 615         }
 616
 617         /*
 618          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 619          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 620          * acpi_leave_sleep_state will reenable specific GPEs later
 621          */
 622         acpi_disable_all_gpes();
 623         /* Allow EC transactions to happen. */
 624         acpi_ec_unblock_transactions();
 625
 626         suspend_nvs_restore();
 627
 628         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 629 }
 630
 631 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 632 {
 633         u32 acpi_state;
 634
 635         switch (pm_state) {
 636         case PM_SUSPEND_ON:
 637         case PM_SUSPEND_STANDBY:
 638         case PM_SUSPEND_MEM:
 639                 acpi_state = acpi_suspend_states[pm_state];
 640
 641                 return sleep_states[acpi_state];
 642         default:
 643                 return 0;
 644         }
 645 }
 646
 647 static const struct platform_suspend_ops acpi_suspend_ops = {
 648         .valid = acpi_suspend_state_valid,
 649         .begin = acpi_suspend_begin,
 650         .prepare_late = acpi_pm_prepare,
 651         .enter = acpi_suspend_enter,
 652         .wake = acpi_pm_finish,
 653         .end = acpi_pm_end,
 654 };
 655
 656 /**
 657  *      acpi_suspend_begin_old - Set the target system sleep state to the
 658  *              state associated with given @pm_state, if supported, and
 659  *              execute the _PTS control method.  This function is used if the
 660  *              pre-ACPI 2.0 suspend ordering has been requested.
 661  */
 662 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 663 {
 664         int error = acpi_suspend_begin(pm_state);
 665         if (!error)
 666                 error = __acpi_pm_prepare();
 667
 668         return error;
 669 }
 670
 671 /*
 672  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 673  * been requested.
 674  */
 675 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 676         .valid = acpi_suspend_state_valid,
 677         .begin = acpi_suspend_begin_old,
 678         .prepare_late = acpi_pm_pre_suspend,
 679         .enter = acpi_suspend_enter,
 680         .wake = acpi_pm_finish,
 681         .end = acpi_pm_end,
 682         .recover = acpi_pm_finish,
 683 };
 684
 685 static bool s2idle_wakeup;
 686
 687 int acpi_s2idle_begin(void)
 688 {
 689         acpi_scan_lock_acquire();
 690         return 0;
 691 }
 692
 693 int acpi_s2idle_prepare(void)
 694 {
 695         if (acpi_sci_irq_valid()) {
 696                 enable_irq_wake(acpi_sci_irq);
 697                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 698         }
 699
 700         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 701
 702         /* Change the configuration of GPEs to avoid spurious wakeup. */
 703         acpi_enable_all_wakeup_gpes();
 704         acpi_os_wait_events_complete();
 705
 706         s2idle_wakeup = true;
 707         return 0;
 708 }
 709
 710 bool acpi_s2idle_wake(void)
 711 {
 712         if (!acpi_sci_irq_valid())
 713                 return pm_wakeup_pending();
 714
 715         while (pm_wakeup_pending()) {
 716                 /*
 717                  * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
 718                  * SCI has not triggered while suspended, so bail out (the
 719                  * wakeup is pending anyway and the SCI is not the source of
 720                  * it).
 721                  */
 722                 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
 723                         pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
 724                         return true;
 725                 }
 726
 727                 /*
 728                  * If the status bit of any enabled fixed event is set, the
 729                  * wakeup is regarded as valid.
 730                  */
 731                 if (acpi_any_fixed_event_status_set()) {
 732                         pm_pr_dbg("ACPI fixed event wakeup\n");
 733                         return true;
 734                 }
 735
 736                 /* Check wakeups from drivers sharing the SCI. */
 737                 if (acpi_check_wakeup_handlers()) {
 738                         pm_pr_dbg("ACPI custom handler wakeup\n");
 739                         return true;
 740                 }
 741
 742                 /* Check non-EC GPE wakeups and dispatch the EC GPE. */
 743                 if (acpi_ec_dispatch_gpe()) {
 744                         pm_pr_dbg("ACPI non-EC GPE wakeup\n");
 745                         return true;
 746                 }
 747
 748                 /*
 749                  * Cancel the SCI wakeup and process all pending events in case
 750                  * there are any wakeup ones in there.
 751                  *
 752                  * Note that if any non-EC GPEs are active at this point, the
 753                  * SCI will retrigger after the rearming below, so no events
 754                  * should be missed by canceling the wakeup here.
 755                  */
 756                 pm_system_cancel_wakeup();
 757                 acpi_os_wait_events_complete();
 758
 759                 /*
 760                  * The SCI is in the "suspended" state now and it cannot produce
 761                  * new wakeup events till the rearming below, so if any of them
 762                  * are pending here, they must be resulting from the processing
 763                  * of EC events above or coming from somewhere else.
 764                  */
 765                 if (pm_wakeup_pending()) {
 766                         pm_pr_dbg("Wakeup after ACPI Notify sync\n");
 767                         return true;
 768                 }
 769
 770                 rearm_wake_irq(acpi_sci_irq);
 771         }
 772
 773         return false;
 774 }
 775
 776 void acpi_s2idle_restore(void)
 777 {
 778         /*
 779          * Drain pending events before restoring the working-state configuration
 780          * of GPEs.
 781          */
 782         acpi_os_wait_events_complete(); /* synchronize GPE processing */
 783         acpi_ec_flush_work(); /* flush the EC driver's workqueues */
 784         acpi_os_wait_events_complete(); /* synchronize Notify handling */
 785
 786         s2idle_wakeup = false;
 787
 788         acpi_enable_all_runtime_gpes();
 789
 790         acpi_disable_wakeup_devices(ACPI_STATE_S0);
 791
 792         if (acpi_sci_irq_valid()) {
 793                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
 794                 disable_irq_wake(acpi_sci_irq);
 795         }
 796 }
 797
 798 void acpi_s2idle_end(void)
 799 {
 800         acpi_scan_lock_release();
 801 }
 802
 803 static const struct platform_s2idle_ops acpi_s2idle_ops = {
 804         .begin = acpi_s2idle_begin,
 805         .prepare = acpi_s2idle_prepare,
 806         .wake = acpi_s2idle_wake,
 807         .restore = acpi_s2idle_restore,
 808         .end = acpi_s2idle_end,
 809 };
 810
 811 void __weak acpi_s2idle_setup(void)
 812 {
 813         s2idle_set_ops(&acpi_s2idle_ops);
 814 }
 815
 816 static void acpi_sleep_suspend_setup(void)
 817 {
 818         int i;
 819
 820         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
 821                 if (acpi_sleep_state_supported(i))
 822                         sleep_states[i] = 1;
 823
 824         suspend_set_ops(old_suspend_ordering ?
 825                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 826
 827         acpi_s2idle_setup();
 828 }
 829
 830 #else /* !CONFIG_SUSPEND */
 831 #define s2idle_wakeup           (false)
 832 static inline void acpi_sleep_suspend_setup(void) {}
 833 #endif /* !CONFIG_SUSPEND */
 834
 835 bool acpi_s2idle_wakeup(void)
 836 {
 837         return s2idle_wakeup;
 838 }
 839
 840 #ifdef CONFIG_PM_SLEEP
 841 static u32 saved_bm_rld;
 842
 843 static int  acpi_save_bm_rld(void)
 844 {
 845         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
 846         return 0;
 847 }
 848
 849 static void  acpi_restore_bm_rld(void)
 850 {
 851         u32 resumed_bm_rld = 0;
 852
 853         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
 854         if (resumed_bm_rld == saved_bm_rld)
 855                 return;
 856
 857         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
 858 }
 859
 860 static struct syscore_ops acpi_sleep_syscore_ops = {
 861         .suspend = acpi_save_bm_rld,
 862         .resume = acpi_restore_bm_rld,
 863 };
 864
 865 static void acpi_sleep_syscore_init(void)
 866 {
 867         register_syscore_ops(&acpi_sleep_syscore_ops);
 868 }
 869 #else
 870 static inline void acpi_sleep_syscore_init(void) {}
 871 #endif /* CONFIG_PM_SLEEP */
 872
 873 #ifdef CONFIG_HIBERNATION
 874 static unsigned long s4_hardware_signature;
 875 static struct acpi_table_facs *facs;
 876 static bool nosigcheck;
 877
 878 void __init acpi_no_s4_hw_signature(void)
 879 {
 880         nosigcheck = true;
 881 }
 882
 883 static int acpi_hibernation_begin(pm_message_t stage)
 884 {
 885         if (!nvs_nosave) {
 886                 int error = suspend_nvs_alloc();
 887                 if (error)
 888                         return error;
 889         }
 890
 891         if (stage.event == PM_EVENT_HIBERNATE)
 892                 pm_set_suspend_via_firmware();
 893
 894         acpi_pm_start(ACPI_STATE_S4);
 895         return 0;
 896 }
 897
 898 static int acpi_hibernation_enter(void)
 899 {
 900         acpi_status status = AE_OK;
 901
 902         ACPI_FLUSH_CPU_CACHE();
 903
 904         /* This shouldn't return.  If it returns, we have a problem */
 905         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 906         /* Reprogram control registers */
 907         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 908
 909         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 910 }
 911
 912 static void acpi_hibernation_leave(void)
 913 {
 914         pm_set_resume_via_firmware();
 915         /*
 916          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 917          * enable it here.
 918          */
 919         acpi_enable();
 920         /* Reprogram control registers */
 921         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 922         /* Check the hardware signature */
 923         if (facs && s4_hardware_signature != facs->hardware_signature)
 924                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
 925         /* Restore the NVS memory area */
 926         suspend_nvs_restore();
 927         /* Allow EC transactions to happen. */
 928         acpi_ec_unblock_transactions();
 929 }
 930
 931 static void acpi_pm_thaw(void)
 932 {
 933         acpi_ec_unblock_transactions();
 934         acpi_enable_all_runtime_gpes();
 935 }
 936
 937 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 938         .begin = acpi_hibernation_begin,
 939         .end = acpi_pm_end,
 940         .pre_snapshot = acpi_pm_prepare,
 941         .finish = acpi_pm_finish,
 942         .prepare = acpi_pm_prepare,
 943         .enter = acpi_hibernation_enter,
 944         .leave = acpi_hibernation_leave,
 945         .pre_restore = acpi_pm_freeze,
 946         .restore_cleanup = acpi_pm_thaw,
 947 };
 948
 949 /**
 950  *      acpi_hibernation_begin_old - Set the target system sleep state to
 951  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 952  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 953  *              requested.
 954  */
 955 static int acpi_hibernation_begin_old(pm_message_t stage)
 956 {
 957         int error;
 958         /*
 959          * The _TTS object should always be evaluated before the _PTS object.
 960          * When the old_suspended_ordering is true, the _PTS object is
 961          * evaluated in the acpi_sleep_prepare.
 962          */
 963         acpi_sleep_tts_switch(ACPI_STATE_S4);
 964
 965         error = acpi_sleep_prepare(ACPI_STATE_S4);
 966         if (error)
 967                 return error;
 968
 969         if (!nvs_nosave) {
 970                 error = suspend_nvs_alloc();
 971                 if (error)
 972                         return error;
 973         }
 974
 975         if (stage.event == PM_EVENT_HIBERNATE)
 976                 pm_set_suspend_via_firmware();
 977
 978         acpi_target_sleep_state = ACPI_STATE_S4;
 979         acpi_scan_lock_acquire();
 980         return 0;
 981 }
 982
 983 /*
 984  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 985  * been requested.
 986  */
 987 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 988         .begin = acpi_hibernation_begin_old,
 989         .end = acpi_pm_end,
 990         .pre_snapshot = acpi_pm_pre_suspend,
 991         .prepare = acpi_pm_freeze,
 992         .finish = acpi_pm_finish,
 993         .enter = acpi_hibernation_enter,
 994         .leave = acpi_hibernation_leave,
 995         .pre_restore = acpi_pm_freeze,
 996         .restore_cleanup = acpi_pm_thaw,
 997         .recover = acpi_pm_finish,
 998 };
 999
1000 static void acpi_sleep_hibernate_setup(void)
1001 {
1002         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1003                 return;
1004
1005         hibernation_set_ops(old_suspend_ordering ?
1006                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1007         sleep_states[ACPI_STATE_S4] = 1;
1008         if (nosigcheck)
1009                 return;
1010
1011         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1012         if (facs)
1013                 s4_hardware_signature = facs->hardware_signature;
1014 }
1015 #else /* !CONFIG_HIBERNATION */
1016 static inline void acpi_sleep_hibernate_setup(void) {}
1017 #endif /* !CONFIG_HIBERNATION */
1018
1019 static void acpi_power_off_prepare(void)
1020 {
1021         /* Prepare to power off the system */
1022         acpi_sleep_prepare(ACPI_STATE_S5);
1023         acpi_disable_all_gpes();
1024         acpi_os_wait_events_complete();
1025 }
1026
1027 static void acpi_power_off(void)
1028 {
1029         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1030         printk(KERN_DEBUG "%s called\n", __func__);
1031         local_irq_disable();
1032         acpi_enter_sleep_state(ACPI_STATE_S5);
1033 }
1034
1035 int __init acpi_sleep_init(void)
1036 {
1037         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1038         char *pos = supported;
1039         int i;
1040
1041         acpi_sleep_dmi_check();
1042
1043         sleep_states[ACPI_STATE_S0] = 1;
1044
1045         acpi_sleep_syscore_init();
1046         acpi_sleep_suspend_setup();
1047         acpi_sleep_hibernate_setup();
1048
1049         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1050                 sleep_states[ACPI_STATE_S5] = 1;
1051                 pm_power_off_prepare = acpi_power_off_prepare;
1052                 pm_power_off = acpi_power_off;
1053         } else {
1054                 acpi_no_s5 = true;
1055         }
1056
1057         supported[0] = 0;
1058         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1059                 if (sleep_states[i])
1060                         pos += sprintf(pos, " S%d", i);
1061         }
1062         pr_info(PREFIX "(supports%s)\n", supported);
1063
1064         /*
1065          * Register the tts_notifier to reboot notifier list so that the _TTS
1066          * object can also be evaluated when the system enters S5.
1067          */
1068         register_reboot_notifier(&tts_notifier);
1069         return 0;
1070 }