1 // SPDX-License-Identifier: GPL-2.0-only
3 * sleep.c - ACPI sleep support.
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
11 #define pr_fmt(fmt) "ACPI: PM: " fmt
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>
24 #include <trace/events/power.h>
30 * Some HW-full platforms do not have _S5, so they may need
31 * to leverage efi power off for a shutdown.
34 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
36 static void acpi_sleep_tts_switch(u32 acpi_state
)
40 status
= acpi_execute_simple_method(NULL
, "\\_TTS", acpi_state
);
41 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
43 * OS can't evaluate the _TTS object correctly. Some warning
44 * message will be printed. But it won't break anything.
46 pr_notice("Failure in evaluating _TTS object\n");
50 static int tts_notify_reboot(struct notifier_block
*this,
51 unsigned long code
, void *x
)
53 acpi_sleep_tts_switch(ACPI_STATE_S5
);
57 static struct notifier_block tts_notifier
= {
58 .notifier_call
= tts_notify_reboot
,
63 static int acpi_sleep_prepare(u32 acpi_state
)
65 #ifdef CONFIG_ACPI_SLEEP
66 unsigned long acpi_wakeup_address
;
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
)
73 acpi_set_waking_vector(acpi_wakeup_address
);
76 ACPI_FLUSH_CPU_CACHE();
78 pr_info("Preparing to enter system sleep state S%d\n", acpi_state
);
79 acpi_enable_wakeup_devices(acpi_state
);
80 acpi_enter_sleep_state_prep(acpi_state
);
84 bool acpi_sleep_state_supported(u8 sleep_state
)
89 status
= acpi_get_sleep_type_data(sleep_state
, &type_a
, &type_b
);
90 return ACPI_SUCCESS(status
) && (!acpi_gbl_reduced_hardware
91 || (acpi_gbl_FADT
.sleep_control
.address
92 && acpi_gbl_FADT
.sleep_status
.address
));
95 #ifdef CONFIG_ACPI_SLEEP
96 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
98 u32
acpi_target_system_state(void)
100 return acpi_target_sleep_state
;
102 EXPORT_SYMBOL_GPL(acpi_target_system_state
);
104 static bool pwr_btn_event_pending
;
107 * The ACPI specification wants us to save NVS memory regions during hibernation
108 * and to restore them during the subsequent resume. Windows does that also for
109 * suspend to RAM. However, it is known that this mechanism does not work on
110 * all machines, so we allow the user to disable it with the help of the
111 * 'acpi_sleep=nonvs' kernel command line option.
113 static bool nvs_nosave
;
115 void __init
acpi_nvs_nosave(void)
121 * The ACPI specification wants us to save NVS memory regions during hibernation
122 * but says nothing about saving NVS during S3. Not all versions of Windows
123 * save NVS on S3 suspend either, and it is clear that not all systems need
124 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
125 * user to disable saving NVS on S3 if their system does not require it, but
126 * continue to save/restore NVS for S4 as specified.
128 static bool nvs_nosave_s3
;
130 void __init
acpi_nvs_nosave_s3(void)
132 nvs_nosave_s3
= true;
135 static int __init
init_nvs_save_s3(const struct dmi_system_id
*d
)
137 nvs_nosave_s3
= false;
142 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
143 * user to request that behavior by using the 'acpi_old_suspend_ordering'
144 * kernel command line option that causes the following variable to be set.
146 static bool old_suspend_ordering
;
148 void __init
acpi_old_suspend_ordering(void)
150 old_suspend_ordering
= true;
153 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
155 acpi_old_suspend_ordering();
159 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
165 bool acpi_sleep_default_s3
;
167 static int __init
init_default_s3(const struct dmi_system_id
*d
)
169 acpi_sleep_default_s3
= true;
173 static const struct dmi_system_id acpisleep_dmi_table
[] __initconst
= {
175 .callback
= init_old_suspend_ordering
,
176 .ident
= "Abit KN9 (nForce4 variant)",
178 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
179 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
183 .callback
= init_old_suspend_ordering
,
184 .ident
= "HP xw4600 Workstation",
186 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
187 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
191 .callback
= init_old_suspend_ordering
,
192 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
194 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
195 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
199 .callback
= init_old_suspend_ordering
,
200 .ident
= "Panasonic CF51-2L",
202 DMI_MATCH(DMI_BOARD_VENDOR
,
203 "Matsushita Electric Industrial Co.,Ltd."),
204 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
208 .callback
= init_nvs_nosave
,
209 .ident
= "Sony Vaio VGN-FW41E_H",
211 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
212 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW41E_H"),
216 .callback
= init_nvs_nosave
,
217 .ident
= "Sony Vaio VGN-FW21E",
219 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
220 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
224 .callback
= init_nvs_nosave
,
225 .ident
= "Sony Vaio VGN-FW21M",
227 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
228 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21M"),
232 .callback
= init_nvs_nosave
,
233 .ident
= "Sony Vaio VPCEB17FX",
235 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
236 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
240 .callback
= init_nvs_nosave
,
241 .ident
= "Sony Vaio VGN-SR11M",
243 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
244 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
248 .callback
= init_nvs_nosave
,
249 .ident
= "Everex StepNote Series",
251 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
252 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
256 .callback
= init_nvs_nosave
,
257 .ident
= "Sony Vaio VPCEB1Z1E",
259 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
260 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
264 .callback
= init_nvs_nosave
,
265 .ident
= "Sony Vaio VGN-NW130D",
267 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
268 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
272 .callback
= init_nvs_nosave
,
273 .ident
= "Sony Vaio VPCCW29FX",
275 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
276 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
280 .callback
= init_nvs_nosave
,
281 .ident
= "Averatec AV1020-ED2",
283 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
284 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
288 .callback
= init_old_suspend_ordering
,
289 .ident
= "Asus A8N-SLI DELUXE",
291 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
292 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
296 .callback
= init_old_suspend_ordering
,
297 .ident
= "Asus A8N-SLI Premium",
299 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
300 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
304 .callback
= init_nvs_nosave
,
305 .ident
= "Sony Vaio VGN-SR26GN_P",
307 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
308 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
312 .callback
= init_nvs_nosave
,
313 .ident
= "Sony Vaio VPCEB1S1E",
315 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
316 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1S1E"),
320 .callback
= init_nvs_nosave
,
321 .ident
= "Sony Vaio VGN-FW520F",
323 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
324 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
328 .callback
= init_nvs_nosave
,
329 .ident
= "Asus K54C",
331 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
332 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
336 .callback
= init_nvs_nosave
,
337 .ident
= "Asus K54HR",
339 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
340 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
344 .callback
= init_nvs_save_s3
,
345 .ident
= "Asus 1025C",
347 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK COMPUTER INC."),
348 DMI_MATCH(DMI_PRODUCT_NAME
, "1025C"),
352 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
353 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
357 .callback
= init_nvs_save_s3
,
358 .ident
= "Lenovo G50-45",
360 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
361 DMI_MATCH(DMI_PRODUCT_NAME
, "80E3"),
365 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
366 * the Low Power S0 Idle firmware interface (see
367 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
370 .callback
= init_default_s3
,
371 .ident
= "ThinkPad X1 Tablet(2016)",
373 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
374 DMI_MATCH(DMI_PRODUCT_NAME
, "20GGA00L00"),
380 static bool ignore_blacklist
;
382 void __init
acpi_sleep_no_blacklist(void)
384 ignore_blacklist
= true;
387 static void __init
acpi_sleep_dmi_check(void)
389 if (ignore_blacklist
)
392 if (dmi_get_bios_year() >= 2012)
393 acpi_nvs_nosave_s3();
395 dmi_check_system(acpisleep_dmi_table
);
399 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
401 static int acpi_pm_freeze(void)
403 acpi_disable_all_gpes();
404 acpi_os_wait_events_complete();
405 acpi_ec_block_transactions();
410 * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
412 static int acpi_pm_pre_suspend(void)
415 return suspend_nvs_save();
419 * __acpi_pm_prepare - Prepare the platform to enter the target state.
421 * If necessary, set the firmware waking vector and do arch-specific
422 * nastiness to get the wakeup code to the waking vector.
424 static int __acpi_pm_prepare(void)
426 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
428 acpi_target_sleep_state
= ACPI_STATE_S0
;
434 * acpi_pm_prepare - Prepare the platform to enter the target sleep
435 * state and disable the GPEs.
437 static int acpi_pm_prepare(void)
439 int error
= __acpi_pm_prepare();
441 error
= acpi_pm_pre_suspend();
447 * acpi_pm_finish - Instruct the platform to leave a sleep state.
449 * This is called after we wake back up (or if entering the sleep state
452 static void acpi_pm_finish(void)
454 struct acpi_device
*pwr_btn_adev
;
455 u32 acpi_state
= acpi_target_sleep_state
;
457 acpi_ec_unblock_transactions();
460 if (acpi_state
== ACPI_STATE_S0
)
463 pr_info("Waking up from system sleep state S%d\n", acpi_state
);
464 acpi_disable_wakeup_devices(acpi_state
);
465 acpi_leave_sleep_state(acpi_state
);
467 /* reset firmware waking vector */
468 acpi_set_waking_vector(0);
470 acpi_target_sleep_state
= ACPI_STATE_S0
;
472 acpi_resume_power_resources();
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).
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
)
483 pwr_btn_event_pending
= false;
484 pwr_btn_adev
= acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF
,
487 pm_wakeup_event(&pwr_btn_adev
->dev
, 0);
488 acpi_dev_put(pwr_btn_adev
);
493 * acpi_pm_start - Start system PM transition.
495 static void acpi_pm_start(u32 acpi_state
)
497 acpi_target_sleep_state
= acpi_state
;
498 acpi_sleep_tts_switch(acpi_target_sleep_state
);
499 acpi_scan_lock_acquire();
503 * acpi_pm_end - Finish up system PM transition.
505 static void acpi_pm_end(void)
507 acpi_turn_off_unused_power_resources();
508 acpi_scan_lock_release();
510 * This is necessary in case acpi_pm_finish() is not called during a
511 * failing transition to a sleep state.
513 acpi_target_sleep_state
= ACPI_STATE_S0
;
514 acpi_sleep_tts_switch(acpi_target_sleep_state
);
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 */
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
532 * acpi_suspend_begin - Set the target system sleep state to the state
533 * associated with given @pm_state, if supported.
535 static int acpi_suspend_begin(suspend_state_t pm_state
)
537 u32 acpi_state
= acpi_suspend_states
[pm_state
];
540 error
= (nvs_nosave
|| nvs_nosave_s3
) ? 0 : suspend_nvs_alloc();
544 if (!sleep_states
[acpi_state
]) {
545 pr_err("ACPI does not support sleep state S%u\n", acpi_state
);
548 if (acpi_state
> ACPI_STATE_S1
)
549 pm_set_suspend_via_firmware();
551 acpi_pm_start(acpi_state
);
556 * acpi_suspend_enter - Actually enter a sleep state.
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.
563 static int acpi_suspend_enter(suspend_state_t pm_state
)
565 acpi_status status
= AE_OK
;
566 u32 acpi_state
= acpi_target_sleep_state
;
569 ACPI_FLUSH_CPU_CACHE();
571 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, true);
572 switch (acpi_state
) {
575 status
= acpi_enter_sleep_state(acpi_state
);
579 if (!acpi_suspend_lowlevel
)
581 error
= acpi_suspend_lowlevel();
584 pr_info("Low-level resume complete\n");
585 pm_set_resume_via_firmware();
588 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, false);
590 /* This violates the spec but is required for bug compatibility. */
591 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
593 /* Reprogram control registers */
594 acpi_leave_sleep_state_prep(acpi_state
);
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 ]
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.
605 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
606 acpi_event_status pwr_btn_status
= ACPI_EVENT_FLAG_DISABLED
;
608 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
610 if (pwr_btn_status
& ACPI_EVENT_FLAG_STATUS_SET
) {
611 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
613 pwr_btn_event_pending
= true;
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
622 acpi_disable_all_gpes();
623 /* Allow EC transactions to happen. */
624 acpi_ec_unblock_transactions();
626 suspend_nvs_restore();
628 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
631 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
637 case PM_SUSPEND_STANDBY
:
639 acpi_state
= acpi_suspend_states
[pm_state
];
641 return sleep_states
[acpi_state
];
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
,
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.
662 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
664 int error
= acpi_suspend_begin(pm_state
);
666 error
= __acpi_pm_prepare();
672 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
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
,
682 .recover
= acpi_pm_finish
,
685 static bool s2idle_wakeup
;
687 int acpi_s2idle_begin(void)
689 acpi_scan_lock_acquire();
693 int acpi_s2idle_prepare(void)
695 if (acpi_sci_irq_valid()) {
696 enable_irq_wake(acpi_sci_irq
);
697 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE
);
700 acpi_enable_wakeup_devices(ACPI_STATE_S0
);
702 /* Change the configuration of GPEs to avoid spurious wakeup. */
703 acpi_enable_all_wakeup_gpes();
704 acpi_os_wait_events_complete();
706 s2idle_wakeup
= true;
710 bool acpi_s2idle_wake(void)
712 if (!acpi_sci_irq_valid())
713 return pm_wakeup_pending();
715 while (pm_wakeup_pending()) {
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
722 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq
))) {
723 pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
728 * If the status bit of any enabled fixed event is set, the
729 * wakeup is regarded as valid.
731 if (acpi_any_fixed_event_status_set()) {
732 pm_pr_dbg("ACPI fixed event wakeup\n");
736 /* Check wakeups from drivers sharing the SCI. */
737 if (acpi_check_wakeup_handlers()) {
738 pm_pr_dbg("ACPI custom handler wakeup\n");
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");
749 * Cancel the SCI wakeup and process all pending events in case
750 * there are any wakeup ones in there.
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.
756 pm_system_cancel_wakeup();
757 acpi_os_wait_events_complete();
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.
765 if (pm_wakeup_pending()) {
766 pm_pr_dbg("Wakeup after ACPI Notify sync\n");
770 pm_wakeup_clear(acpi_sci_irq
);
771 rearm_wake_irq(acpi_sci_irq
);
777 void acpi_s2idle_restore(void)
780 * Drain pending events before restoring the working-state configuration
783 acpi_os_wait_events_complete(); /* synchronize GPE processing */
784 acpi_ec_flush_work(); /* flush the EC driver's workqueues */
785 acpi_os_wait_events_complete(); /* synchronize Notify handling */
787 s2idle_wakeup
= false;
789 acpi_enable_all_runtime_gpes();
791 acpi_disable_wakeup_devices(ACPI_STATE_S0
);
793 if (acpi_sci_irq_valid()) {
794 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE
);
795 disable_irq_wake(acpi_sci_irq
);
799 void acpi_s2idle_end(void)
801 acpi_scan_lock_release();
804 static const struct platform_s2idle_ops acpi_s2idle_ops
= {
805 .begin
= acpi_s2idle_begin
,
806 .prepare
= acpi_s2idle_prepare
,
807 .wake
= acpi_s2idle_wake
,
808 .restore
= acpi_s2idle_restore
,
809 .end
= acpi_s2idle_end
,
812 void __weak
acpi_s2idle_setup(void)
814 s2idle_set_ops(&acpi_s2idle_ops
);
817 static void acpi_sleep_suspend_setup(void)
821 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++)
822 if (acpi_sleep_state_supported(i
))
825 suspend_set_ops(old_suspend_ordering
?
826 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
831 #else /* !CONFIG_SUSPEND */
832 #define s2idle_wakeup (false)
833 static inline void acpi_sleep_suspend_setup(void) {}
834 #endif /* !CONFIG_SUSPEND */
836 bool acpi_s2idle_wakeup(void)
838 return s2idle_wakeup
;
841 #ifdef CONFIG_PM_SLEEP
842 static u32 saved_bm_rld
;
844 static int acpi_save_bm_rld(void)
846 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &saved_bm_rld
);
850 static void acpi_restore_bm_rld(void)
852 u32 resumed_bm_rld
= 0;
854 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &resumed_bm_rld
);
855 if (resumed_bm_rld
== saved_bm_rld
)
858 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, saved_bm_rld
);
861 static struct syscore_ops acpi_sleep_syscore_ops
= {
862 .suspend
= acpi_save_bm_rld
,
863 .resume
= acpi_restore_bm_rld
,
866 static void acpi_sleep_syscore_init(void)
868 register_syscore_ops(&acpi_sleep_syscore_ops
);
871 static inline void acpi_sleep_syscore_init(void) {}
872 #endif /* CONFIG_PM_SLEEP */
874 #ifdef CONFIG_HIBERNATION
875 static unsigned long s4_hardware_signature
;
876 static struct acpi_table_facs
*facs
;
877 static bool nosigcheck
;
879 void __init
acpi_no_s4_hw_signature(void)
884 static int acpi_hibernation_begin(pm_message_t stage
)
887 int error
= suspend_nvs_alloc();
892 if (stage
.event
== PM_EVENT_HIBERNATE
)
893 pm_set_suspend_via_firmware();
895 acpi_pm_start(ACPI_STATE_S4
);
899 static int acpi_hibernation_enter(void)
901 acpi_status status
= AE_OK
;
903 ACPI_FLUSH_CPU_CACHE();
905 /* This shouldn't return. If it returns, we have a problem */
906 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
907 /* Reprogram control registers */
908 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
910 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
913 static void acpi_hibernation_leave(void)
915 pm_set_resume_via_firmware();
917 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
921 /* Reprogram control registers */
922 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
923 /* Check the hardware signature */
924 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
)
925 pr_crit("Hardware changed while hibernated, success doubtful!\n");
926 /* Restore the NVS memory area */
927 suspend_nvs_restore();
928 /* Allow EC transactions to happen. */
929 acpi_ec_unblock_transactions();
932 static void acpi_pm_thaw(void)
934 acpi_ec_unblock_transactions();
935 acpi_enable_all_runtime_gpes();
938 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
939 .begin
= acpi_hibernation_begin
,
941 .pre_snapshot
= acpi_pm_prepare
,
942 .finish
= acpi_pm_finish
,
943 .prepare
= acpi_pm_prepare
,
944 .enter
= acpi_hibernation_enter
,
945 .leave
= acpi_hibernation_leave
,
946 .pre_restore
= acpi_pm_freeze
,
947 .restore_cleanup
= acpi_pm_thaw
,
951 * acpi_hibernation_begin_old - Set the target system sleep state to
952 * ACPI_STATE_S4 and execute the _PTS control method. This
953 * function is used if the pre-ACPI 2.0 suspend ordering has been
956 static int acpi_hibernation_begin_old(pm_message_t stage
)
960 * The _TTS object should always be evaluated before the _PTS object.
961 * When the old_suspended_ordering is true, the _PTS object is
962 * evaluated in the acpi_sleep_prepare.
964 acpi_sleep_tts_switch(ACPI_STATE_S4
);
966 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
971 error
= suspend_nvs_alloc();
976 if (stage
.event
== PM_EVENT_HIBERNATE
)
977 pm_set_suspend_via_firmware();
979 acpi_target_sleep_state
= ACPI_STATE_S4
;
980 acpi_scan_lock_acquire();
985 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
988 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
989 .begin
= acpi_hibernation_begin_old
,
991 .pre_snapshot
= acpi_pm_pre_suspend
,
992 .prepare
= acpi_pm_freeze
,
993 .finish
= acpi_pm_finish
,
994 .enter
= acpi_hibernation_enter
,
995 .leave
= acpi_hibernation_leave
,
996 .pre_restore
= acpi_pm_freeze
,
997 .restore_cleanup
= acpi_pm_thaw
,
998 .recover
= acpi_pm_finish
,
1001 static void acpi_sleep_hibernate_setup(void)
1003 if (!acpi_sleep_state_supported(ACPI_STATE_S4
))
1006 hibernation_set_ops(old_suspend_ordering
?
1007 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
1008 sleep_states
[ACPI_STATE_S4
] = 1;
1012 acpi_get_table(ACPI_SIG_FACS
, 1, (struct acpi_table_header
**)&facs
);
1014 s4_hardware_signature
= facs
->hardware_signature
;
1016 #else /* !CONFIG_HIBERNATION */
1017 static inline void acpi_sleep_hibernate_setup(void) {}
1018 #endif /* !CONFIG_HIBERNATION */
1020 static void acpi_power_off_prepare(void)
1022 /* Prepare to power off the system */
1023 acpi_sleep_prepare(ACPI_STATE_S5
);
1024 acpi_disable_all_gpes();
1025 acpi_os_wait_events_complete();
1028 static void acpi_power_off(void)
1030 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1031 pr_debug("%s called\n", __func__
);
1032 local_irq_disable();
1033 acpi_enter_sleep_state(ACPI_STATE_S5
);
1036 int __init
acpi_sleep_init(void)
1038 char supported
[ACPI_S_STATE_COUNT
* 3 + 1];
1039 char *pos
= supported
;
1042 acpi_sleep_dmi_check();
1044 sleep_states
[ACPI_STATE_S0
] = 1;
1046 acpi_sleep_syscore_init();
1047 acpi_sleep_suspend_setup();
1048 acpi_sleep_hibernate_setup();
1050 if (acpi_sleep_state_supported(ACPI_STATE_S5
)) {
1051 sleep_states
[ACPI_STATE_S5
] = 1;
1052 pm_power_off_prepare
= acpi_power_off_prepare
;
1053 pm_power_off
= acpi_power_off
;
1059 for (i
= 0; i
< ACPI_S_STATE_COUNT
; i
++) {
1060 if (sleep_states
[i
])
1061 pos
+= sprintf(pos
, " S%d", i
);
1063 pr_info("(supports%s)\n", supported
);
1066 * Register the tts_notifier to reboot notifier list so that the _TTS
1067 * object can also be evaluated when the system enters S5.
1069 register_reboot_notifier(&tts_notifier
);