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 #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 all GPE and clear their status bits before interrupts are
 640          * enabled. Some GPEs (like wakeup GPEs) have no handlers and this can
 641          * prevent them from producing spurious interrups.
 642          *
 643          * acpi_leave_sleep_state() will reenable specific GPEs later.
 644          *
 645          * Because this code runs on one CPU with disabled interrupts (all of
 646          * the other CPUs are offline at this time), it need not acquire any
 647          * sleeping locks which may trigger an implicit preemption point even
 648          * if there is no contention, so avoid doing that by using a low-level
 649          * library routine here.
 650          */
 651         acpi_hw_disable_all_gpes();
 652         /* Allow EC transactions to happen. */
 653         acpi_ec_unblock_transactions();
 654
 655         suspend_nvs_restore();
 656
 657         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 658 }
 659
 660 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 661 {
 662         u32 acpi_state;
 663
 664         switch (pm_state) {
 665         case PM_SUSPEND_ON:
 666         case PM_SUSPEND_STANDBY:
 667         case PM_SUSPEND_MEM:
 668                 acpi_state = acpi_suspend_states[pm_state];
 669
 670                 return sleep_states[acpi_state];
 671         default:
 672                 return 0;
 673         }
 674 }
 675
 676 static const struct platform_suspend_ops acpi_suspend_ops = {
 677         .valid = acpi_suspend_state_valid,
 678         .begin = acpi_suspend_begin,
 679         .prepare_late = acpi_pm_prepare,
 680         .enter = acpi_suspend_enter,
 681         .wake = acpi_pm_finish,
 682         .end = acpi_pm_end,
 683 };
 684
 685 /**
 686  *      acpi_suspend_begin_old - Set the target system sleep state to the
 687  *              state associated with given @pm_state, if supported, and
 688  *              execute the _PTS control method.  This function is used if the
 689  *              pre-ACPI 2.0 suspend ordering has been requested.
 690  */
 691 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 692 {
 693         int error = acpi_suspend_begin(pm_state);
 694         if (!error)
 695                 error = __acpi_pm_prepare();
 696
 697         return error;
 698 }
 699
 700 /*
 701  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 702  * been requested.
 703  */
 704 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 705         .valid = acpi_suspend_state_valid,
 706         .begin = acpi_suspend_begin_old,
 707         .prepare_late = acpi_pm_pre_suspend,
 708         .enter = acpi_suspend_enter,
 709         .wake = acpi_pm_finish,
 710         .end = acpi_pm_end,
 711         .recover = acpi_pm_finish,
 712 };
 713
 714 static bool s2idle_wakeup;
 715
 716 int acpi_s2idle_begin(void)
 717 {
 718         acpi_scan_lock_acquire();
 719         return 0;
 720 }
 721
 722 int acpi_s2idle_prepare(void)
 723 {
 724         if (acpi_sci_irq_valid()) {
 725                 int error;
 726
 727                 error = enable_irq_wake(acpi_sci_irq);
 728                 if (error)
 729                         pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n",
 730                                 acpi_sci_irq, error);
 731
 732                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 733         }
 734
 735         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 736
 737         /* Change the configuration of GPEs to avoid spurious wakeup. */
 738         acpi_enable_all_wakeup_gpes();
 739         acpi_os_wait_events_complete();
 740
 741         s2idle_wakeup = true;
 742         return 0;
 743 }
 744
 745 bool acpi_s2idle_wake(void)
 746 {
 747         if (!acpi_sci_irq_valid())
 748                 return pm_wakeup_pending();
 749
 750         while (pm_wakeup_pending()) {
 751                 /*
 752                  * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
 753                  * SCI has not triggered while suspended, so bail out (the
 754                  * wakeup is pending anyway and the SCI is not the source of
 755                  * it).
 756                  */
 757                 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
 758                         pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
 759                         return true;
 760                 }
 761
 762                 /*
 763                  * If the status bit of any enabled fixed event is set, the
 764                  * wakeup is regarded as valid.
 765                  */
 766                 if (acpi_any_fixed_event_status_set()) {
 767                         pm_pr_dbg("ACPI fixed event wakeup\n");
 768                         return true;
 769                 }
 770
 771                 /* Check wakeups from drivers sharing the SCI. */
 772                 if (acpi_check_wakeup_handlers()) {
 773                         pm_pr_dbg("ACPI custom handler wakeup\n");
 774                         return true;
 775                 }
 776
 777                 /*
 778                  * Check non-EC GPE wakeups and if there are none, cancel the
 779                  * SCI-related wakeup and dispatch the EC GPE.
 780                  */
 781                 if (acpi_ec_dispatch_gpe()) {
 782                         pm_pr_dbg("ACPI non-EC GPE wakeup\n");
 783                         return true;
 784                 }
 785
 786                 acpi_os_wait_events_complete();
 787
 788                 /*
 789                  * The SCI is in the "suspended" state now and it cannot produce
 790                  * new wakeup events till the rearming below, so if any of them
 791                  * are pending here, they must be resulting from the processing
 792                  * of EC events above or coming from somewhere else.
 793                  */
 794                 if (pm_wakeup_pending()) {
 795                         pm_pr_dbg("Wakeup after ACPI Notify sync\n");
 796                         return true;
 797                 }
 798
 799                 pm_pr_dbg("Rearming ACPI SCI for wakeup\n");
 800
 801                 pm_wakeup_clear(acpi_sci_irq);
 802                 rearm_wake_irq(acpi_sci_irq);
 803         }
 804
 805         return false;
 806 }
 807
 808 void acpi_s2idle_restore(void)
 809 {
 810         /*
 811          * Drain pending events before restoring the working-state configuration
 812          * of GPEs.
 813          */
 814         acpi_os_wait_events_complete(); /* synchronize GPE processing */
 815         acpi_ec_flush_work(); /* flush the EC driver's workqueues */
 816         acpi_os_wait_events_complete(); /* synchronize Notify handling */
 817
 818         s2idle_wakeup = false;
 819
 820         acpi_enable_all_runtime_gpes();
 821
 822         acpi_disable_wakeup_devices(ACPI_STATE_S0);
 823
 824         if (acpi_sci_irq_valid()) {
 825                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
 826                 disable_irq_wake(acpi_sci_irq);
 827         }
 828 }
 829
 830 void acpi_s2idle_end(void)
 831 {
 832         acpi_scan_lock_release();
 833 }
 834
 835 static const struct platform_s2idle_ops acpi_s2idle_ops = {
 836         .begin = acpi_s2idle_begin,
 837         .prepare = acpi_s2idle_prepare,
 838         .wake = acpi_s2idle_wake,
 839         .restore = acpi_s2idle_restore,
 840         .end = acpi_s2idle_end,
 841 };
 842
 843 void __weak acpi_s2idle_setup(void)
 844 {
 845         if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
 846                 pr_info("Efficient low-power S0 idle declared\n");
 847
 848         s2idle_set_ops(&acpi_s2idle_ops);
 849 }
 850
 851 static void __init acpi_sleep_suspend_setup(void)
 852 {
 853         bool suspend_ops_needed = false;
 854         int i;
 855
 856         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
 857                 if (acpi_sleep_state_supported(i)) {
 858                         sleep_states[i] = 1;
 859                         suspend_ops_needed = true;
 860                 }
 861
 862         if (suspend_ops_needed)
 863                 suspend_set_ops(old_suspend_ordering ?
 864                                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 865
 866         acpi_s2idle_setup();
 867 }
 868
 869 #else /* !CONFIG_SUSPEND */
 870 #define s2idle_wakeup           (false)
 871 static inline void acpi_sleep_suspend_setup(void) {}
 872 #endif /* !CONFIG_SUSPEND */
 873
 874 bool acpi_s2idle_wakeup(void)
 875 {
 876         return s2idle_wakeup;
 877 }
 878
 879 #ifdef CONFIG_PM_SLEEP
 880 static u32 saved_bm_rld;
 881
 882 static int  acpi_save_bm_rld(void)
 883 {
 884         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
 885         return 0;
 886 }
 887
 888 static void  acpi_restore_bm_rld(void)
 889 {
 890         u32 resumed_bm_rld = 0;
 891
 892         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
 893         if (resumed_bm_rld == saved_bm_rld)
 894                 return;
 895
 896         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
 897 }
 898
 899 static struct syscore_ops acpi_sleep_syscore_ops = {
 900         .suspend = acpi_save_bm_rld,
 901         .resume = acpi_restore_bm_rld,
 902 };
 903
 904 static void acpi_sleep_syscore_init(void)
 905 {
 906         register_syscore_ops(&acpi_sleep_syscore_ops);
 907 }
 908 #else
 909 static inline void acpi_sleep_syscore_init(void) {}
 910 #endif /* CONFIG_PM_SLEEP */
 911
 912 #ifdef CONFIG_HIBERNATION
 913 static unsigned long s4_hardware_signature;
 914 static struct acpi_table_facs *facs;
 915 int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */
 916
 917 static int acpi_hibernation_begin(pm_message_t stage)
 918 {
 919         if (!nvs_nosave) {
 920                 int error = suspend_nvs_alloc();
 921                 if (error)
 922                         return error;
 923         }
 924
 925         if (stage.event == PM_EVENT_HIBERNATE)
 926                 pm_set_suspend_via_firmware();
 927
 928         acpi_pm_start(ACPI_STATE_S4);
 929         return 0;
 930 }
 931
 932 static int acpi_hibernation_enter(void)
 933 {
 934         acpi_status status = AE_OK;
 935
 936         /* This shouldn't return.  If it returns, we have a problem */
 937         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 938         /* Reprogram control registers */
 939         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 940
 941         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 942 }
 943
 944 static void acpi_hibernation_leave(void)
 945 {
 946         pm_set_resume_via_firmware();
 947         /*
 948          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 949          * enable it here.
 950          */
 951         acpi_enable();
 952         /* Reprogram control registers */
 953         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 954         /* Check the hardware signature */
 955         if (facs && s4_hardware_signature != facs->hardware_signature)
 956                 pr_crit("Hardware changed while hibernated, success doubtful!\n");
 957         /* Restore the NVS memory area */
 958         suspend_nvs_restore();
 959         /* Allow EC transactions to happen. */
 960         acpi_ec_unblock_transactions();
 961 }
 962
 963 static void acpi_pm_thaw(void)
 964 {
 965         acpi_ec_unblock_transactions();
 966         acpi_enable_all_runtime_gpes();
 967 }
 968
 969 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 970         .begin = acpi_hibernation_begin,
 971         .end = acpi_pm_end,
 972         .pre_snapshot = acpi_pm_prepare,
 973         .finish = acpi_pm_finish,
 974         .prepare = acpi_pm_prepare,
 975         .enter = acpi_hibernation_enter,
 976         .leave = acpi_hibernation_leave,
 977         .pre_restore = acpi_pm_freeze,
 978         .restore_cleanup = acpi_pm_thaw,
 979 };
 980
 981 /**
 982  *      acpi_hibernation_begin_old - Set the target system sleep state to
 983  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 984  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 985  *              requested.
 986  */
 987 static int acpi_hibernation_begin_old(pm_message_t stage)
 988 {
 989         int error;
 990         /*
 991          * The _TTS object should always be evaluated before the _PTS object.
 992          * When the old_suspended_ordering is true, the _PTS object is
 993          * evaluated in the acpi_sleep_prepare.
 994          */
 995         acpi_sleep_tts_switch(ACPI_STATE_S4);
 996
 997         error = acpi_sleep_prepare(ACPI_STATE_S4);
 998         if (error)
 999                 return error;
1000
1001         if (!nvs_nosave) {
1002                 error = suspend_nvs_alloc();
1003                 if (error)
1004                         return error;
1005         }
1006
1007         if (stage.event == PM_EVENT_HIBERNATE)
1008                 pm_set_suspend_via_firmware();
1009
1010         acpi_target_sleep_state = ACPI_STATE_S4;
1011         acpi_scan_lock_acquire();
1012         return 0;
1013 }
1014
1015 /*
1016  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1017  * been requested.
1018  */
1019 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1020         .begin = acpi_hibernation_begin_old,
1021         .end = acpi_pm_end,
1022         .pre_snapshot = acpi_pm_pre_suspend,
1023         .prepare = acpi_pm_freeze,
1024         .finish = acpi_pm_finish,
1025         .enter = acpi_hibernation_enter,
1026         .leave = acpi_hibernation_leave,
1027         .pre_restore = acpi_pm_freeze,
1028         .restore_cleanup = acpi_pm_thaw,
1029         .recover = acpi_pm_finish,
1030 };
1031
1032 static void acpi_sleep_hibernate_setup(void)
1033 {
1034         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1035                 return;
1036
1037         hibernation_set_ops(old_suspend_ordering ?
1038                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1039         sleep_states[ACPI_STATE_S4] = 1;
1040         if (!acpi_check_s4_hw_signature)
1041                 return;
1042
1043         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1044         if (facs) {
1045                 /*
1046                  * s4_hardware_signature is the local variable which is just
1047                  * used to warn about mismatch after we're attempting to
1048                  * resume (in violation of the ACPI specification.)
1049                  */
1050                 s4_hardware_signature = facs->hardware_signature;
1051
1052                 if (acpi_check_s4_hw_signature > 0) {
1053                         /*
1054                          * If we're actually obeying the ACPI specification
1055                          * then the signature is written out as part of the
1056                          * swsusp header, in order to allow the boot kernel
1057                          * to gracefully decline to resume.
1058                          */
1059                         swsusp_hardware_signature = facs->hardware_signature;
1060                 }
1061         }
1062 }
1063 #else /* !CONFIG_HIBERNATION */
1064 static inline void acpi_sleep_hibernate_setup(void) {}
1065 #endif /* !CONFIG_HIBERNATION */
1066
1067 static int acpi_power_off_prepare(struct sys_off_data *data)
1068 {
1069         /* Prepare to power off the system */
1070         acpi_sleep_prepare(ACPI_STATE_S5);
1071         acpi_disable_all_gpes();
1072         acpi_os_wait_events_complete();
1073         return NOTIFY_DONE;
1074 }
1075
1076 static int acpi_power_off(struct sys_off_data *data)
1077 {
1078         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1079         pr_debug("%s called\n", __func__);
1080         local_irq_disable();
1081         acpi_enter_sleep_state(ACPI_STATE_S5);
1082         return NOTIFY_DONE;
1083 }
1084
1085 int __init acpi_sleep_init(void)
1086 {
1087         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1088         char *pos = supported;
1089         int i;
1090
1091         acpi_sleep_dmi_check();
1092
1093         sleep_states[ACPI_STATE_S0] = 1;
1094
1095         acpi_sleep_syscore_init();
1096         acpi_sleep_suspend_setup();
1097         acpi_sleep_hibernate_setup();
1098
1099         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1100                 sleep_states[ACPI_STATE_S5] = 1;
1101
1102                 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
1103                                          SYS_OFF_PRIO_FIRMWARE,
1104                                          acpi_power_off_prepare, NULL);
1105
1106                 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
1107                                          SYS_OFF_PRIO_FIRMWARE,
1108                                          acpi_power_off, NULL);
1109
1110                 /*
1111                  * Windows uses S5 for reboot, so some BIOSes depend on it to
1112                  * perform proper reboot.
1113                  */
1114                 register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
1115                                          SYS_OFF_PRIO_FIRMWARE,
1116                                          acpi_power_off_prepare, NULL);
1117         } else {
1118                 acpi_no_s5 = true;
1119         }
1120
1121         supported[0] = 0;
1122         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1123                 if (sleep_states[i])
1124                         pos += sprintf(pos, " S%d", i);
1125         }
1126         pr_info("(supports%s)\n", supported);
1127
1128         /*
1129          * Register the tts_notifier to reboot notifier list so that the _TTS
1130          * object can also be evaluated when the system enters S5.
1131          */
1132         register_reboot_notifier(&tts_notifier);
1133         return 0;
1134 }