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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 */
31bool acpi_no_s5;
32static u8 sleep_states[ACPI_S_STATE_COUNT];
33
34static 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
48static 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
55static struct notifier_block tts_notifier = {
56 .notifier_call = tts_notify_reboot,
57 .next = NULL,
58 .priority = 0,
59};
60
61static 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
83bool 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
95static bool sleep_no_lps0 __read_mostly;
96module_param(sleep_no_lps0, bool, 0644);
97MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
98
99static u32 acpi_target_sleep_state = ACPI_STATE_S0;
100
101u32 acpi_target_system_state(void)
102{
103 return acpi_target_sleep_state;
104}
105EXPORT_SYMBOL_GPL(acpi_target_system_state);
106
107static 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 */
116static bool nvs_nosave;
117
118void __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 */
131static bool nvs_nosave_s3;
132
133void __init acpi_nvs_nosave_s3(void)
134{
135 nvs_nosave_s3 = true;
136}
137
138static 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 */
149static bool old_suspend_ordering;
150
151void __init acpi_old_suspend_ordering(void)
152{
153 old_suspend_ordering = true;
154}
155
156static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
157{
158 acpi_old_suspend_ordering();
159 return 0;
160}
161
162static int __init init_nvs_nosave(const struct dmi_system_id *d)
163{
164 acpi_nvs_nosave();
165 return 0;
166}
167
168static bool acpi_sleep_default_s3;
169
170static int __init init_default_s3(const struct dmi_system_id *d)
171{
172 acpi_sleep_default_s3 = true;
173 return 0;
174}
175
176static 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 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
369 * the Low Power S0 Idle firmware interface (see
370 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
371 */
372 {
373 .callback = init_default_s3,
374 .ident = "ThinkPad X1 Tablet(2016)",
375 .matches = {
376 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
377 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
378 },
379 },
380 {},
381};
382
383static bool ignore_blacklist;
384
385void __init acpi_sleep_no_blacklist(void)
386{
387 ignore_blacklist = true;
388}
389
390static void __init acpi_sleep_dmi_check(void)
391{
392 if (ignore_blacklist)
393 return;
394
395 if (dmi_get_bios_year() >= 2012)
396 acpi_nvs_nosave_s3();
397
398 dmi_check_system(acpisleep_dmi_table);
399}
400
401/**
402 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
403 */
404static int acpi_pm_freeze(void)
405{
406 acpi_disable_all_gpes();
407 acpi_os_wait_events_complete();
408 acpi_ec_block_transactions();
409 return 0;
410}
411
412/**
413 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
414 */
415static int acpi_pm_pre_suspend(void)
416{
417 acpi_pm_freeze();
418 return suspend_nvs_save();
419}
420
421/**
422 * __acpi_pm_prepare - Prepare the platform to enter the target state.
423 *
424 * If necessary, set the firmware waking vector and do arch-specific
425 * nastiness to get the wakeup code to the waking vector.
426 */
427static int __acpi_pm_prepare(void)
428{
429 int error = acpi_sleep_prepare(acpi_target_sleep_state);
430 if (error)
431 acpi_target_sleep_state = ACPI_STATE_S0;
432
433 return error;
434}
435
436/**
437 * acpi_pm_prepare - Prepare the platform to enter the target sleep
438 * state and disable the GPEs.
439 */
440static int acpi_pm_prepare(void)
441{
442 int error = __acpi_pm_prepare();
443 if (!error)
444 error = acpi_pm_pre_suspend();
445
446 return error;
447}
448
449/**
450 * acpi_pm_finish - Instruct the platform to leave a sleep state.
451 *
452 * This is called after we wake back up (or if entering the sleep state
453 * failed).
454 */
455static void acpi_pm_finish(void)
456{
457 struct acpi_device *pwr_btn_adev;
458 u32 acpi_state = acpi_target_sleep_state;
459
460 acpi_ec_unblock_transactions();
461 suspend_nvs_free();
462
463 if (acpi_state == ACPI_STATE_S0)
464 return;
465
466 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
467 acpi_state);
468 acpi_disable_wakeup_devices(acpi_state);
469 acpi_leave_sleep_state(acpi_state);
470
471 /* reset firmware waking vector */
472 acpi_set_waking_vector(0);
473
474 acpi_target_sleep_state = ACPI_STATE_S0;
475
476 acpi_resume_power_resources();
477
478 /* If we were woken with the fixed power button, provide a small
479 * hint to userspace in the form of a wakeup event on the fixed power
480 * button device (if it can be found).
481 *
482 * We delay the event generation til now, as the PM layer requires
483 * timekeeping to be running before we generate events. */
484 if (!pwr_btn_event_pending)
485 return;
486
487 pwr_btn_event_pending = false;
488 pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
489 NULL, -1);
490 if (pwr_btn_adev) {
491 pm_wakeup_event(&pwr_btn_adev->dev, 0);
492 acpi_dev_put(pwr_btn_adev);
493 }
494}
495
496/**
497 * acpi_pm_start - Start system PM transition.
498 */
499static void acpi_pm_start(u32 acpi_state)
500{
501 acpi_target_sleep_state = acpi_state;
502 acpi_sleep_tts_switch(acpi_target_sleep_state);
503 acpi_scan_lock_acquire();
504}
505
506/**
507 * acpi_pm_end - Finish up system PM transition.
508 */
509static void acpi_pm_end(void)
510{
511 acpi_turn_off_unused_power_resources();
512 acpi_scan_lock_release();
513 /*
514 * This is necessary in case acpi_pm_finish() is not called during a
515 * failing transition to a sleep state.
516 */
517 acpi_target_sleep_state = ACPI_STATE_S0;
518 acpi_sleep_tts_switch(acpi_target_sleep_state);
519}
520#else /* !CONFIG_ACPI_SLEEP */
521#define sleep_no_lps0 (1)
522#define acpi_target_sleep_state ACPI_STATE_S0
523#define acpi_sleep_default_s3 (1)
524static inline void acpi_sleep_dmi_check(void) {}
525#endif /* CONFIG_ACPI_SLEEP */
526
527#ifdef CONFIG_SUSPEND
528static u32 acpi_suspend_states[] = {
529 [PM_SUSPEND_ON] = ACPI_STATE_S0,
530 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
531 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
532 [PM_SUSPEND_MAX] = ACPI_STATE_S5
533};
534
535/**
536 * acpi_suspend_begin - Set the target system sleep state to the state
537 * associated with given @pm_state, if supported.
538 */
539static int acpi_suspend_begin(suspend_state_t pm_state)
540{
541 u32 acpi_state = acpi_suspend_states[pm_state];
542 int error;
543
544 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
545 if (error)
546 return error;
547
548 if (!sleep_states[acpi_state]) {
549 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
550 return -ENOSYS;
551 }
552 if (acpi_state > ACPI_STATE_S1)
553 pm_set_suspend_via_firmware();
554
555 acpi_pm_start(acpi_state);
556 return 0;
557}
558
559/**
560 * acpi_suspend_enter - Actually enter a sleep state.
561 * @pm_state: ignored
562 *
563 * Flush caches and go to sleep. For STR we have to call arch-specific
564 * assembly, which in turn call acpi_enter_sleep_state().
565 * It's unfortunate, but it works. Please fix if you're feeling frisky.
566 */
567static int acpi_suspend_enter(suspend_state_t pm_state)
568{
569 acpi_status status = AE_OK;
570 u32 acpi_state = acpi_target_sleep_state;
571 int error;
572
573 ACPI_FLUSH_CPU_CACHE();
574
575 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
576 switch (acpi_state) {
577 case ACPI_STATE_S1:
578 barrier();
579 status = acpi_enter_sleep_state(acpi_state);
580 break;
581
582 case ACPI_STATE_S3:
583 if (!acpi_suspend_lowlevel)
584 return -ENOSYS;
585 error = acpi_suspend_lowlevel();
586 if (error)
587 return error;
588 pr_info(PREFIX "Low-level resume complete\n");
589 pm_set_resume_via_firmware();
590 break;
591 }
592 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
593
594 /* This violates the spec but is required for bug compatibility. */
595 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
596
597 /* Reprogram control registers */
598 acpi_leave_sleep_state_prep(acpi_state);
599
600 /* ACPI 3.0 specs (P62) says that it's the responsibility
601 * of the OSPM to clear the status bit [ implying that the
602 * POWER_BUTTON event should not reach userspace ]
603 *
604 * However, we do generate a small hint for userspace in the form of
605 * a wakeup event. We flag this condition for now and generate the
606 * event later, as we're currently too early in resume to be able to
607 * generate wakeup events.
608 */
609 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
610 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
611
612 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
613
614 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
615 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
616 /* Flag for later */
617 pwr_btn_event_pending = true;
618 }
619 }
620
621 /*
622 * Disable and clear GPE status before interrupt is enabled. Some GPEs
623 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
624 * acpi_leave_sleep_state will reenable specific GPEs later
625 */
626 acpi_disable_all_gpes();
627 /* Allow EC transactions to happen. */
628 acpi_ec_unblock_transactions();
629
630 suspend_nvs_restore();
631
632 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
633}
634
635static int acpi_suspend_state_valid(suspend_state_t pm_state)
636{
637 u32 acpi_state;
638
639 switch (pm_state) {
640 case PM_SUSPEND_ON:
641 case PM_SUSPEND_STANDBY:
642 case PM_SUSPEND_MEM:
643 acpi_state = acpi_suspend_states[pm_state];
644
645 return sleep_states[acpi_state];
646 default:
647 return 0;
648 }
649}
650
651static const struct platform_suspend_ops acpi_suspend_ops = {
652 .valid = acpi_suspend_state_valid,
653 .begin = acpi_suspend_begin,
654 .prepare_late = acpi_pm_prepare,
655 .enter = acpi_suspend_enter,
656 .wake = acpi_pm_finish,
657 .end = acpi_pm_end,
658};
659
660/**
661 * acpi_suspend_begin_old - Set the target system sleep state to the
662 * state associated with given @pm_state, if supported, and
663 * execute the _PTS control method. This function is used if the
664 * pre-ACPI 2.0 suspend ordering has been requested.
665 */
666static int acpi_suspend_begin_old(suspend_state_t pm_state)
667{
668 int error = acpi_suspend_begin(pm_state);
669 if (!error)
670 error = __acpi_pm_prepare();
671
672 return error;
673}
674
675/*
676 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
677 * been requested.
678 */
679static const struct platform_suspend_ops acpi_suspend_ops_old = {
680 .valid = acpi_suspend_state_valid,
681 .begin = acpi_suspend_begin_old,
682 .prepare_late = acpi_pm_pre_suspend,
683 .enter = acpi_suspend_enter,
684 .wake = acpi_pm_finish,
685 .end = acpi_pm_end,
686 .recover = acpi_pm_finish,
687};
688
689static bool s2idle_wakeup;
690
691/*
692 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
693 * device object with the PNP0D80 compatible device ID (System Power Management
694 * Controller) and a specific _DSM method under it. That method, if present,
695 * can be used to indicate to the platform that the OS is transitioning into a
696 * low-power state in which certain types of activity are not desirable or that
697 * it is leaving such a state, which allows the platform to adjust its operation
698 * mode accordingly.
699 */
700static const struct acpi_device_id lps0_device_ids[] = {
701 {"PNP0D80", },
702 {"", },
703};
704
705#define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
706
707#define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
708#define ACPI_LPS0_SCREEN_OFF 3
709#define ACPI_LPS0_SCREEN_ON 4
710#define ACPI_LPS0_ENTRY 5
711#define ACPI_LPS0_EXIT 6
712
713static acpi_handle lps0_device_handle;
714static guid_t lps0_dsm_guid;
715static char lps0_dsm_func_mask;
716
717/* Device constraint entry structure */
718struct lpi_device_info {
719 char *name;
720 int enabled;
721 union acpi_object *package;
722};
723
724/* Constraint package structure */
725struct lpi_device_constraint {
726 int uid;
727 int min_dstate;
728 int function_states;
729};
730
731struct lpi_constraints {
732 acpi_handle handle;
733 int min_dstate;
734};
735
736static struct lpi_constraints *lpi_constraints_table;
737static int lpi_constraints_table_size;
738
739static void lpi_device_get_constraints(void)
740{
741 union acpi_object *out_obj;
742 int i;
743
744 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
745 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
746 NULL, ACPI_TYPE_PACKAGE);
747
748 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
749 out_obj ? "successful" : "failed");
750
751 if (!out_obj)
752 return;
753
754 lpi_constraints_table = kcalloc(out_obj->package.count,
755 sizeof(*lpi_constraints_table),
756 GFP_KERNEL);
757 if (!lpi_constraints_table)
758 goto free_acpi_buffer;
759
760 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
761
762 for (i = 0; i < out_obj->package.count; i++) {
763 struct lpi_constraints *constraint;
764 acpi_status status;
765 union acpi_object *package = &out_obj->package.elements[i];
766 struct lpi_device_info info = { };
767 int package_count = 0, j;
768
769 if (!package)
770 continue;
771
772 for (j = 0; j < package->package.count; ++j) {
773 union acpi_object *element =
774 &(package->package.elements[j]);
775
776 switch (element->type) {
777 case ACPI_TYPE_INTEGER:
778 info.enabled = element->integer.value;
779 break;
780 case ACPI_TYPE_STRING:
781 info.name = element->string.pointer;
782 break;
783 case ACPI_TYPE_PACKAGE:
784 package_count = element->package.count;
785 info.package = element->package.elements;
786 break;
787 }
788 }
789
790 if (!info.enabled || !info.package || !info.name)
791 continue;
792
793 constraint = &lpi_constraints_table[lpi_constraints_table_size];
794
795 status = acpi_get_handle(NULL, info.name, &constraint->handle);
796 if (ACPI_FAILURE(status))
797 continue;
798
799 acpi_handle_debug(lps0_device_handle,
800 "index:%d Name:%s\n", i, info.name);
801
802 constraint->min_dstate = -1;
803
804 for (j = 0; j < package_count; ++j) {
805 union acpi_object *info_obj = &info.package[j];
806 union acpi_object *cnstr_pkg;
807 union acpi_object *obj;
808 struct lpi_device_constraint dev_info;
809
810 switch (info_obj->type) {
811 case ACPI_TYPE_INTEGER:
812 /* version */
813 break;
814 case ACPI_TYPE_PACKAGE:
815 if (info_obj->package.count < 2)
816 break;
817
818 cnstr_pkg = info_obj->package.elements;
819 obj = &cnstr_pkg[0];
820 dev_info.uid = obj->integer.value;
821 obj = &cnstr_pkg[1];
822 dev_info.min_dstate = obj->integer.value;
823
824 acpi_handle_debug(lps0_device_handle,
825 "uid:%d min_dstate:%s\n",
826 dev_info.uid,
827 acpi_power_state_string(dev_info.min_dstate));
828
829 constraint->min_dstate = dev_info.min_dstate;
830 break;
831 }
832 }
833
834 if (constraint->min_dstate < 0) {
835 acpi_handle_debug(lps0_device_handle,
836 "Incomplete constraint defined\n");
837 continue;
838 }
839
840 lpi_constraints_table_size++;
841 }
842
843 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
844
845free_acpi_buffer:
846 ACPI_FREE(out_obj);
847}
848
849static void lpi_check_constraints(void)
850{
851 int i;
852
853 for (i = 0; i < lpi_constraints_table_size; ++i) {
854 acpi_handle handle = lpi_constraints_table[i].handle;
855 struct acpi_device *adev;
856
857 if (!handle || acpi_bus_get_device(handle, &adev))
858 continue;
859
860 acpi_handle_debug(handle,
861 "LPI: required min power state:%s current power state:%s\n",
862 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
863 acpi_power_state_string(adev->power.state));
864
865 if (!adev->flags.power_manageable) {
866 acpi_handle_info(handle, "LPI: Device not power manageable\n");
867 lpi_constraints_table[i].handle = NULL;
868 continue;
869 }
870
871 if (adev->power.state < lpi_constraints_table[i].min_dstate)
872 acpi_handle_info(handle,
873 "LPI: Constraint not met; min power state:%s current power state:%s\n",
874 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
875 acpi_power_state_string(adev->power.state));
876 }
877}
878
879static void acpi_sleep_run_lps0_dsm(unsigned int func)
880{
881 union acpi_object *out_obj;
882
883 if (!(lps0_dsm_func_mask & (1 << func)))
884 return;
885
886 out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
887 ACPI_FREE(out_obj);
888
889 acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
890 func, out_obj ? "successful" : "failed");
891}
892
893static int lps0_device_attach(struct acpi_device *adev,
894 const struct acpi_device_id *not_used)
895{
896 union acpi_object *out_obj;
897
898 if (lps0_device_handle)
899 return 0;
900
901 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
902 return 0;
903
904 guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
905 /* Check if the _DSM is present and as expected. */
906 out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
907 if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
908 acpi_handle_debug(adev->handle,
909 "_DSM function 0 evaluation failed\n");
910 return 0;
911 }
912
913 lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
914
915 ACPI_FREE(out_obj);
916
917 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
918 lps0_dsm_func_mask);
919
920 lps0_device_handle = adev->handle;
921
922 lpi_device_get_constraints();
923
924 /*
925 * Use suspend-to-idle by default if the default suspend mode was not
926 * set from the command line.
927 */
928 if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
929 mem_sleep_current = PM_SUSPEND_TO_IDLE;
930
931 /*
932 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
933 * EC GPE to be enabled while suspended for certain wakeup devices to
934 * work, so mark it as wakeup-capable.
935 */
936 acpi_ec_mark_gpe_for_wake();
937
938 return 0;
939}
940
941static struct acpi_scan_handler lps0_handler = {
942 .ids = lps0_device_ids,
943 .attach = lps0_device_attach,
944};
945
946static int acpi_s2idle_begin(void)
947{
948 acpi_scan_lock_acquire();
949 return 0;
950}
951
952static int acpi_s2idle_prepare(void)
953{
954 if (acpi_sci_irq_valid()) {
955 enable_irq_wake(acpi_sci_irq);
956 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
957 }
958
959 acpi_enable_wakeup_devices(ACPI_STATE_S0);
960
961 /* Change the configuration of GPEs to avoid spurious wakeup. */
962 acpi_enable_all_wakeup_gpes();
963 acpi_os_wait_events_complete();
964
965 s2idle_wakeup = true;
966 return 0;
967}
968
969static int acpi_s2idle_prepare_late(void)
970{
971 if (!lps0_device_handle || sleep_no_lps0)
972 return 0;
973
974 if (pm_debug_messages_on)
975 lpi_check_constraints();
976
977 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
978 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
979
980 return 0;
981}
982
983static bool acpi_s2idle_wake(void)
984{
985 if (!acpi_sci_irq_valid())
986 return pm_wakeup_pending();
987
988 while (pm_wakeup_pending()) {
989 /*
990 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
991 * SCI has not triggered while suspended, so bail out (the
992 * wakeup is pending anyway and the SCI is not the source of
993 * it).
994 */
995 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
996 pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
997 return true;
998 }
999
1000 /*
1001 * If the status bit of any enabled fixed event is set, the
1002 * wakeup is regarded as valid.
1003 */
1004 if (acpi_any_fixed_event_status_set()) {
1005 pm_pr_dbg("ACPI fixed event wakeup\n");
1006 return true;
1007 }
1008
1009 /* Check wakeups from drivers sharing the SCI. */
1010 if (acpi_check_wakeup_handlers()) {
1011 pm_pr_dbg("ACPI custom handler wakeup\n");
1012 return true;
1013 }
1014
1015 /* Check non-EC GPE wakeups and dispatch the EC GPE. */
1016 if (acpi_ec_dispatch_gpe()) {
1017 pm_pr_dbg("ACPI non-EC GPE wakeup\n");
1018 return true;
1019 }
1020
1021 /*
1022 * Cancel the SCI wakeup and process all pending events in case
1023 * there are any wakeup ones in there.
1024 *
1025 * Note that if any non-EC GPEs are active at this point, the
1026 * SCI will retrigger after the rearming below, so no events
1027 * should be missed by canceling the wakeup here.
1028 */
1029 pm_system_cancel_wakeup();
1030 acpi_os_wait_events_complete();
1031
1032 /*
1033 * The SCI is in the "suspended" state now and it cannot produce
1034 * new wakeup events till the rearming below, so if any of them
1035 * are pending here, they must be resulting from the processing
1036 * of EC events above or coming from somewhere else.
1037 */
1038 if (pm_wakeup_pending()) {
1039 pm_pr_dbg("Wakeup after ACPI Notify sync\n");
1040 return true;
1041 }
1042
1043 rearm_wake_irq(acpi_sci_irq);
1044 }
1045
1046 return false;
1047}
1048
1049static void acpi_s2idle_restore_early(void)
1050{
1051 if (!lps0_device_handle || sleep_no_lps0)
1052 return;
1053
1054 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1055 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1056}
1057
1058static void acpi_s2idle_restore(void)
1059{
1060 /*
1061 * Drain pending events before restoring the working-state configuration
1062 * of GPEs.
1063 */
1064 acpi_os_wait_events_complete(); /* synchronize GPE processing */
1065 acpi_ec_flush_work(); /* flush the EC driver's workqueues */
1066 acpi_os_wait_events_complete(); /* synchronize Notify handling */
1067
1068 s2idle_wakeup = false;
1069
1070 acpi_enable_all_runtime_gpes();
1071
1072 acpi_disable_wakeup_devices(ACPI_STATE_S0);
1073
1074 if (acpi_sci_irq_valid()) {
1075 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1076 disable_irq_wake(acpi_sci_irq);
1077 }
1078}
1079
1080static void acpi_s2idle_end(void)
1081{
1082 acpi_scan_lock_release();
1083}
1084
1085static const struct platform_s2idle_ops acpi_s2idle_ops = {
1086 .begin = acpi_s2idle_begin,
1087 .prepare = acpi_s2idle_prepare,
1088 .prepare_late = acpi_s2idle_prepare_late,
1089 .wake = acpi_s2idle_wake,
1090 .restore_early = acpi_s2idle_restore_early,
1091 .restore = acpi_s2idle_restore,
1092 .end = acpi_s2idle_end,
1093};
1094
1095static void acpi_sleep_suspend_setup(void)
1096{
1097 int i;
1098
1099 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1100 if (acpi_sleep_state_supported(i))
1101 sleep_states[i] = 1;
1102
1103 suspend_set_ops(old_suspend_ordering ?
1104 &acpi_suspend_ops_old : &acpi_suspend_ops);
1105
1106 acpi_scan_add_handler(&lps0_handler);
1107 s2idle_set_ops(&acpi_s2idle_ops);
1108}
1109
1110#else /* !CONFIG_SUSPEND */
1111#define s2idle_wakeup (false)
1112#define lps0_device_handle (NULL)
1113static inline void acpi_sleep_suspend_setup(void) {}
1114#endif /* !CONFIG_SUSPEND */
1115
1116bool acpi_s2idle_wakeup(void)
1117{
1118 return s2idle_wakeup;
1119}
1120
1121#ifdef CONFIG_PM_SLEEP
1122static u32 saved_bm_rld;
1123
1124static int acpi_save_bm_rld(void)
1125{
1126 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1127 return 0;
1128}
1129
1130static void acpi_restore_bm_rld(void)
1131{
1132 u32 resumed_bm_rld = 0;
1133
1134 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1135 if (resumed_bm_rld == saved_bm_rld)
1136 return;
1137
1138 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1139}
1140
1141static struct syscore_ops acpi_sleep_syscore_ops = {
1142 .suspend = acpi_save_bm_rld,
1143 .resume = acpi_restore_bm_rld,
1144};
1145
1146static void acpi_sleep_syscore_init(void)
1147{
1148 register_syscore_ops(&acpi_sleep_syscore_ops);
1149}
1150#else
1151static inline void acpi_sleep_syscore_init(void) {}
1152#endif /* CONFIG_PM_SLEEP */
1153
1154#ifdef CONFIG_HIBERNATION
1155static unsigned long s4_hardware_signature;
1156static struct acpi_table_facs *facs;
1157static bool nosigcheck;
1158
1159void __init acpi_no_s4_hw_signature(void)
1160{
1161 nosigcheck = true;
1162}
1163
1164static int acpi_hibernation_begin(pm_message_t stage)
1165{
1166 if (!nvs_nosave) {
1167 int error = suspend_nvs_alloc();
1168 if (error)
1169 return error;
1170 }
1171
1172 if (stage.event == PM_EVENT_HIBERNATE)
1173 pm_set_suspend_via_firmware();
1174
1175 acpi_pm_start(ACPI_STATE_S4);
1176 return 0;
1177}
1178
1179static int acpi_hibernation_enter(void)
1180{
1181 acpi_status status = AE_OK;
1182
1183 ACPI_FLUSH_CPU_CACHE();
1184
1185 /* This shouldn't return. If it returns, we have a problem */
1186 status = acpi_enter_sleep_state(ACPI_STATE_S4);
1187 /* Reprogram control registers */
1188 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1189
1190 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1191}
1192
1193static void acpi_hibernation_leave(void)
1194{
1195 pm_set_resume_via_firmware();
1196 /*
1197 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1198 * enable it here.
1199 */
1200 acpi_enable();
1201 /* Reprogram control registers */
1202 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1203 /* Check the hardware signature */
1204 if (facs && s4_hardware_signature != facs->hardware_signature)
1205 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1206 /* Restore the NVS memory area */
1207 suspend_nvs_restore();
1208 /* Allow EC transactions to happen. */
1209 acpi_ec_unblock_transactions();
1210}
1211
1212static void acpi_pm_thaw(void)
1213{
1214 acpi_ec_unblock_transactions();
1215 acpi_enable_all_runtime_gpes();
1216}
1217
1218static const struct platform_hibernation_ops acpi_hibernation_ops = {
1219 .begin = acpi_hibernation_begin,
1220 .end = acpi_pm_end,
1221 .pre_snapshot = acpi_pm_prepare,
1222 .finish = acpi_pm_finish,
1223 .prepare = acpi_pm_prepare,
1224 .enter = acpi_hibernation_enter,
1225 .leave = acpi_hibernation_leave,
1226 .pre_restore = acpi_pm_freeze,
1227 .restore_cleanup = acpi_pm_thaw,
1228};
1229
1230/**
1231 * acpi_hibernation_begin_old - Set the target system sleep state to
1232 * ACPI_STATE_S4 and execute the _PTS control method. This
1233 * function is used if the pre-ACPI 2.0 suspend ordering has been
1234 * requested.
1235 */
1236static int acpi_hibernation_begin_old(pm_message_t stage)
1237{
1238 int error;
1239 /*
1240 * The _TTS object should always be evaluated before the _PTS object.
1241 * When the old_suspended_ordering is true, the _PTS object is
1242 * evaluated in the acpi_sleep_prepare.
1243 */
1244 acpi_sleep_tts_switch(ACPI_STATE_S4);
1245
1246 error = acpi_sleep_prepare(ACPI_STATE_S4);
1247 if (error)
1248 return error;
1249
1250 if (!nvs_nosave) {
1251 error = suspend_nvs_alloc();
1252 if (error)
1253 return error;
1254 }
1255
1256 if (stage.event == PM_EVENT_HIBERNATE)
1257 pm_set_suspend_via_firmware();
1258
1259 acpi_target_sleep_state = ACPI_STATE_S4;
1260 acpi_scan_lock_acquire();
1261 return 0;
1262}
1263
1264/*
1265 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1266 * been requested.
1267 */
1268static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1269 .begin = acpi_hibernation_begin_old,
1270 .end = acpi_pm_end,
1271 .pre_snapshot = acpi_pm_pre_suspend,
1272 .prepare = acpi_pm_freeze,
1273 .finish = acpi_pm_finish,
1274 .enter = acpi_hibernation_enter,
1275 .leave = acpi_hibernation_leave,
1276 .pre_restore = acpi_pm_freeze,
1277 .restore_cleanup = acpi_pm_thaw,
1278 .recover = acpi_pm_finish,
1279};
1280
1281static void acpi_sleep_hibernate_setup(void)
1282{
1283 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1284 return;
1285
1286 hibernation_set_ops(old_suspend_ordering ?
1287 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1288 sleep_states[ACPI_STATE_S4] = 1;
1289 if (nosigcheck)
1290 return;
1291
1292 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1293 if (facs) {
1294 s4_hardware_signature = facs->hardware_signature;
1295 acpi_put_table((struct acpi_table_header *)facs);
1296 }
1297}
1298#else /* !CONFIG_HIBERNATION */
1299static inline void acpi_sleep_hibernate_setup(void) {}
1300#endif /* !CONFIG_HIBERNATION */
1301
1302static void acpi_power_off_prepare(void)
1303{
1304 /* Prepare to power off the system */
1305 acpi_sleep_prepare(ACPI_STATE_S5);
1306 acpi_disable_all_gpes();
1307 acpi_os_wait_events_complete();
1308}
1309
1310static void acpi_power_off(void)
1311{
1312 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1313 printk(KERN_DEBUG "%s called\n", __func__);
1314 local_irq_disable();
1315 acpi_enter_sleep_state(ACPI_STATE_S5);
1316}
1317
1318int __init acpi_sleep_init(void)
1319{
1320 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1321 char *pos = supported;
1322 int i;
1323
1324 acpi_sleep_dmi_check();
1325
1326 sleep_states[ACPI_STATE_S0] = 1;
1327
1328 acpi_sleep_syscore_init();
1329 acpi_sleep_suspend_setup();
1330 acpi_sleep_hibernate_setup();
1331
1332 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1333 sleep_states[ACPI_STATE_S5] = 1;
1334 pm_power_off_prepare = acpi_power_off_prepare;
1335 pm_power_off = acpi_power_off;
1336 } else {
1337 acpi_no_s5 = true;
1338 }
1339
1340 supported[0] = 0;
1341 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1342 if (sleep_states[i])
1343 pos += sprintf(pos, " S%d", i);
1344 }
1345 pr_info(PREFIX "(supports%s)\n", supported);
1346
1347 /*
1348 * Register the tts_notifier to reboot notifier list so that the _TTS
1349 * object can also be evaluated when the system enters S5.
1350 */
1351 register_reboot_notifier(&tts_notifier);
1352 return 0;
1353}
1/*
2 * sleep.c - ACPI sleep support.
3 *
4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (c) 2000-2003 Patrick Mochel
7 * Copyright (c) 2003 Open Source Development Lab
8 *
9 * This file is released under the GPLv2.
10 *
11 */
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 */
33bool acpi_no_s5;
34static u8 sleep_states[ACPI_S_STATE_COUNT];
35
36static 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 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
47 }
48}
49
50static 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
57static struct notifier_block tts_notifier = {
58 .notifier_call = tts_notify_reboot,
59 .next = NULL,
60 .priority = 0,
61};
62
63static int acpi_sleep_prepare(u32 acpi_state)
64{
65#ifdef CONFIG_ACPI_SLEEP
66 /* do we have a wakeup address for S2 and S3? */
67 if (acpi_state == ACPI_STATE_S3) {
68 if (!acpi_wakeup_address)
69 return -EFAULT;
70 acpi_set_waking_vector(acpi_wakeup_address);
71
72 }
73 ACPI_FLUSH_CPU_CACHE();
74#endif
75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
76 acpi_state);
77 acpi_enable_wakeup_devices(acpi_state);
78 acpi_enter_sleep_state_prep(acpi_state);
79 return 0;
80}
81
82static bool acpi_sleep_state_supported(u8 sleep_state)
83{
84 acpi_status status;
85 u8 type_a, type_b;
86
87 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
88 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
89 || (acpi_gbl_FADT.sleep_control.address
90 && acpi_gbl_FADT.sleep_status.address));
91}
92
93#ifdef CONFIG_ACPI_SLEEP
94static u32 acpi_target_sleep_state = ACPI_STATE_S0;
95
96u32 acpi_target_system_state(void)
97{
98 return acpi_target_sleep_state;
99}
100EXPORT_SYMBOL_GPL(acpi_target_system_state);
101
102static bool pwr_btn_event_pending;
103
104/*
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. Windows does that also for
107 * suspend to RAM. However, it is known that this mechanism does not work on
108 * all machines, so we allow the user to disable it with the help of the
109 * 'acpi_sleep=nonvs' kernel command line option.
110 */
111static bool nvs_nosave;
112
113void __init acpi_nvs_nosave(void)
114{
115 nvs_nosave = true;
116}
117
118/*
119 * The ACPI specification wants us to save NVS memory regions during hibernation
120 * but says nothing about saving NVS during S3. Not all versions of Windows
121 * save NVS on S3 suspend either, and it is clear that not all systems need
122 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
123 * user to disable saving NVS on S3 if their system does not require it, but
124 * continue to save/restore NVS for S4 as specified.
125 */
126static bool nvs_nosave_s3;
127
128void __init acpi_nvs_nosave_s3(void)
129{
130 nvs_nosave_s3 = true;
131}
132
133static int __init init_nvs_save_s3(const struct dmi_system_id *d)
134{
135 nvs_nosave_s3 = false;
136 return 0;
137}
138
139/*
140 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
141 * user to request that behavior by using the 'acpi_old_suspend_ordering'
142 * kernel command line option that causes the following variable to be set.
143 */
144static bool old_suspend_ordering;
145
146void __init acpi_old_suspend_ordering(void)
147{
148 old_suspend_ordering = true;
149}
150
151static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
152{
153 acpi_old_suspend_ordering();
154 return 0;
155}
156
157static int __init init_nvs_nosave(const struct dmi_system_id *d)
158{
159 acpi_nvs_nosave();
160 return 0;
161}
162
163static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
164 {
165 .callback = init_old_suspend_ordering,
166 .ident = "Abit KN9 (nForce4 variant)",
167 .matches = {
168 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
169 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
170 },
171 },
172 {
173 .callback = init_old_suspend_ordering,
174 .ident = "HP xw4600 Workstation",
175 .matches = {
176 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
177 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
178 },
179 },
180 {
181 .callback = init_old_suspend_ordering,
182 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
183 .matches = {
184 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
185 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
186 },
187 },
188 {
189 .callback = init_old_suspend_ordering,
190 .ident = "Panasonic CF51-2L",
191 .matches = {
192 DMI_MATCH(DMI_BOARD_VENDOR,
193 "Matsushita Electric Industrial Co.,Ltd."),
194 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
195 },
196 },
197 {
198 .callback = init_nvs_nosave,
199 .ident = "Sony Vaio VGN-FW41E_H",
200 .matches = {
201 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
202 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
203 },
204 },
205 {
206 .callback = init_nvs_nosave,
207 .ident = "Sony Vaio VGN-FW21E",
208 .matches = {
209 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
211 },
212 },
213 {
214 .callback = init_nvs_nosave,
215 .ident = "Sony Vaio VGN-FW21M",
216 .matches = {
217 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
219 },
220 },
221 {
222 .callback = init_nvs_nosave,
223 .ident = "Sony Vaio VPCEB17FX",
224 .matches = {
225 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
227 },
228 },
229 {
230 .callback = init_nvs_nosave,
231 .ident = "Sony Vaio VGN-SR11M",
232 .matches = {
233 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
235 },
236 },
237 {
238 .callback = init_nvs_nosave,
239 .ident = "Everex StepNote Series",
240 .matches = {
241 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
243 },
244 },
245 {
246 .callback = init_nvs_nosave,
247 .ident = "Sony Vaio VPCEB1Z1E",
248 .matches = {
249 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
250 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
251 },
252 },
253 {
254 .callback = init_nvs_nosave,
255 .ident = "Sony Vaio VGN-NW130D",
256 .matches = {
257 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
259 },
260 },
261 {
262 .callback = init_nvs_nosave,
263 .ident = "Sony Vaio VPCCW29FX",
264 .matches = {
265 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
267 },
268 },
269 {
270 .callback = init_nvs_nosave,
271 .ident = "Averatec AV1020-ED2",
272 .matches = {
273 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
274 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
275 },
276 },
277 {
278 .callback = init_old_suspend_ordering,
279 .ident = "Asus A8N-SLI DELUXE",
280 .matches = {
281 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
282 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
283 },
284 },
285 {
286 .callback = init_old_suspend_ordering,
287 .ident = "Asus A8N-SLI Premium",
288 .matches = {
289 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
291 },
292 },
293 {
294 .callback = init_nvs_nosave,
295 .ident = "Sony Vaio VGN-SR26GN_P",
296 .matches = {
297 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
298 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
299 },
300 },
301 {
302 .callback = init_nvs_nosave,
303 .ident = "Sony Vaio VPCEB1S1E",
304 .matches = {
305 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
307 },
308 },
309 {
310 .callback = init_nvs_nosave,
311 .ident = "Sony Vaio VGN-FW520F",
312 .matches = {
313 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
315 },
316 },
317 {
318 .callback = init_nvs_nosave,
319 .ident = "Asus K54C",
320 .matches = {
321 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
323 },
324 },
325 {
326 .callback = init_nvs_nosave,
327 .ident = "Asus K54HR",
328 .matches = {
329 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
331 },
332 },
333 /*
334 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
335 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
336 * saving during S3.
337 */
338 {
339 .callback = init_nvs_save_s3,
340 .ident = "Lenovo G50-45",
341 .matches = {
342 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
343 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
344 },
345 },
346 {},
347};
348
349static void __init acpi_sleep_dmi_check(void)
350{
351 int year;
352
353 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
354 acpi_nvs_nosave_s3();
355
356 dmi_check_system(acpisleep_dmi_table);
357}
358
359/**
360 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
361 */
362static int acpi_pm_freeze(void)
363{
364 acpi_disable_all_gpes();
365 acpi_os_wait_events_complete();
366 acpi_ec_block_transactions();
367 return 0;
368}
369
370/**
371 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
372 */
373static int acpi_pm_pre_suspend(void)
374{
375 acpi_pm_freeze();
376 return suspend_nvs_save();
377}
378
379/**
380 * __acpi_pm_prepare - Prepare the platform to enter the target state.
381 *
382 * If necessary, set the firmware waking vector and do arch-specific
383 * nastiness to get the wakeup code to the waking vector.
384 */
385static int __acpi_pm_prepare(void)
386{
387 int error = acpi_sleep_prepare(acpi_target_sleep_state);
388 if (error)
389 acpi_target_sleep_state = ACPI_STATE_S0;
390
391 return error;
392}
393
394/**
395 * acpi_pm_prepare - Prepare the platform to enter the target sleep
396 * state and disable the GPEs.
397 */
398static int acpi_pm_prepare(void)
399{
400 int error = __acpi_pm_prepare();
401 if (!error)
402 error = acpi_pm_pre_suspend();
403
404 return error;
405}
406
407static int find_powerf_dev(struct device *dev, void *data)
408{
409 struct acpi_device *device = to_acpi_device(dev);
410 const char *hid = acpi_device_hid(device);
411
412 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
413}
414
415/**
416 * acpi_pm_finish - Instruct the platform to leave a sleep state.
417 *
418 * This is called after we wake back up (or if entering the sleep state
419 * failed).
420 */
421static void acpi_pm_finish(void)
422{
423 struct device *pwr_btn_dev;
424 u32 acpi_state = acpi_target_sleep_state;
425
426 acpi_ec_unblock_transactions();
427 suspend_nvs_free();
428
429 if (acpi_state == ACPI_STATE_S0)
430 return;
431
432 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
433 acpi_state);
434 acpi_disable_wakeup_devices(acpi_state);
435 acpi_leave_sleep_state(acpi_state);
436
437 /* reset firmware waking vector */
438 acpi_set_waking_vector(0);
439
440 acpi_target_sleep_state = ACPI_STATE_S0;
441
442 acpi_resume_power_resources();
443
444 /* If we were woken with the fixed power button, provide a small
445 * hint to userspace in the form of a wakeup event on the fixed power
446 * button device (if it can be found).
447 *
448 * We delay the event generation til now, as the PM layer requires
449 * timekeeping to be running before we generate events. */
450 if (!pwr_btn_event_pending)
451 return;
452
453 pwr_btn_event_pending = false;
454 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
455 find_powerf_dev);
456 if (pwr_btn_dev) {
457 pm_wakeup_event(pwr_btn_dev, 0);
458 put_device(pwr_btn_dev);
459 }
460}
461
462/**
463 * acpi_pm_start - Start system PM transition.
464 */
465static void acpi_pm_start(u32 acpi_state)
466{
467 acpi_target_sleep_state = acpi_state;
468 acpi_sleep_tts_switch(acpi_target_sleep_state);
469 acpi_scan_lock_acquire();
470}
471
472/**
473 * acpi_pm_end - Finish up system PM transition.
474 */
475static void acpi_pm_end(void)
476{
477 acpi_scan_lock_release();
478 /*
479 * This is necessary in case acpi_pm_finish() is not called during a
480 * failing transition to a sleep state.
481 */
482 acpi_target_sleep_state = ACPI_STATE_S0;
483 acpi_sleep_tts_switch(acpi_target_sleep_state);
484}
485#else /* !CONFIG_ACPI_SLEEP */
486#define acpi_target_sleep_state ACPI_STATE_S0
487static inline void acpi_sleep_dmi_check(void) {}
488#endif /* CONFIG_ACPI_SLEEP */
489
490#ifdef CONFIG_SUSPEND
491static u32 acpi_suspend_states[] = {
492 [PM_SUSPEND_ON] = ACPI_STATE_S0,
493 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
494 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
495 [PM_SUSPEND_MAX] = ACPI_STATE_S5
496};
497
498/**
499 * acpi_suspend_begin - Set the target system sleep state to the state
500 * associated with given @pm_state, if supported.
501 */
502static int acpi_suspend_begin(suspend_state_t pm_state)
503{
504 u32 acpi_state = acpi_suspend_states[pm_state];
505 int error;
506
507 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
508 if (error)
509 return error;
510
511 if (!sleep_states[acpi_state]) {
512 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
513 return -ENOSYS;
514 }
515 if (acpi_state > ACPI_STATE_S1)
516 pm_set_suspend_via_firmware();
517
518 acpi_pm_start(acpi_state);
519 return 0;
520}
521
522/**
523 * acpi_suspend_enter - Actually enter a sleep state.
524 * @pm_state: ignored
525 *
526 * Flush caches and go to sleep. For STR we have to call arch-specific
527 * assembly, which in turn call acpi_enter_sleep_state().
528 * It's unfortunate, but it works. Please fix if you're feeling frisky.
529 */
530static int acpi_suspend_enter(suspend_state_t pm_state)
531{
532 acpi_status status = AE_OK;
533 u32 acpi_state = acpi_target_sleep_state;
534 int error;
535
536 ACPI_FLUSH_CPU_CACHE();
537
538 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
539 switch (acpi_state) {
540 case ACPI_STATE_S1:
541 barrier();
542 status = acpi_enter_sleep_state(acpi_state);
543 break;
544
545 case ACPI_STATE_S3:
546 if (!acpi_suspend_lowlevel)
547 return -ENOSYS;
548 error = acpi_suspend_lowlevel();
549 if (error)
550 return error;
551 pr_info(PREFIX "Low-level resume complete\n");
552 pm_set_resume_via_firmware();
553 break;
554 }
555 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
556
557 /* This violates the spec but is required for bug compatibility. */
558 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
559
560 /* Reprogram control registers */
561 acpi_leave_sleep_state_prep(acpi_state);
562
563 /* ACPI 3.0 specs (P62) says that it's the responsibility
564 * of the OSPM to clear the status bit [ implying that the
565 * POWER_BUTTON event should not reach userspace ]
566 *
567 * However, we do generate a small hint for userspace in the form of
568 * a wakeup event. We flag this condition for now and generate the
569 * event later, as we're currently too early in resume to be able to
570 * generate wakeup events.
571 */
572 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
573 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
574
575 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
576
577 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
578 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
579 /* Flag for later */
580 pwr_btn_event_pending = true;
581 }
582 }
583
584 /*
585 * Disable and clear GPE status before interrupt is enabled. Some GPEs
586 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
587 * acpi_leave_sleep_state will reenable specific GPEs later
588 */
589 acpi_disable_all_gpes();
590 /* Allow EC transactions to happen. */
591 acpi_ec_unblock_transactions();
592
593 suspend_nvs_restore();
594
595 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
596}
597
598static int acpi_suspend_state_valid(suspend_state_t pm_state)
599{
600 u32 acpi_state;
601
602 switch (pm_state) {
603 case PM_SUSPEND_ON:
604 case PM_SUSPEND_STANDBY:
605 case PM_SUSPEND_MEM:
606 acpi_state = acpi_suspend_states[pm_state];
607
608 return sleep_states[acpi_state];
609 default:
610 return 0;
611 }
612}
613
614static const struct platform_suspend_ops acpi_suspend_ops = {
615 .valid = acpi_suspend_state_valid,
616 .begin = acpi_suspend_begin,
617 .prepare_late = acpi_pm_prepare,
618 .enter = acpi_suspend_enter,
619 .wake = acpi_pm_finish,
620 .end = acpi_pm_end,
621};
622
623/**
624 * acpi_suspend_begin_old - Set the target system sleep state to the
625 * state associated with given @pm_state, if supported, and
626 * execute the _PTS control method. This function is used if the
627 * pre-ACPI 2.0 suspend ordering has been requested.
628 */
629static int acpi_suspend_begin_old(suspend_state_t pm_state)
630{
631 int error = acpi_suspend_begin(pm_state);
632 if (!error)
633 error = __acpi_pm_prepare();
634
635 return error;
636}
637
638/*
639 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
640 * been requested.
641 */
642static const struct platform_suspend_ops acpi_suspend_ops_old = {
643 .valid = acpi_suspend_state_valid,
644 .begin = acpi_suspend_begin_old,
645 .prepare_late = acpi_pm_pre_suspend,
646 .enter = acpi_suspend_enter,
647 .wake = acpi_pm_finish,
648 .end = acpi_pm_end,
649 .recover = acpi_pm_finish,
650};
651
652static int acpi_freeze_begin(void)
653{
654 acpi_scan_lock_acquire();
655 return 0;
656}
657
658static int acpi_freeze_prepare(void)
659{
660 acpi_enable_wakeup_devices(ACPI_STATE_S0);
661 acpi_enable_all_wakeup_gpes();
662 acpi_os_wait_events_complete();
663 if (acpi_sci_irq_valid())
664 enable_irq_wake(acpi_sci_irq);
665 return 0;
666}
667
668static void acpi_freeze_restore(void)
669{
670 acpi_disable_wakeup_devices(ACPI_STATE_S0);
671 if (acpi_sci_irq_valid())
672 disable_irq_wake(acpi_sci_irq);
673 acpi_enable_all_runtime_gpes();
674}
675
676static void acpi_freeze_end(void)
677{
678 acpi_scan_lock_release();
679}
680
681static const struct platform_freeze_ops acpi_freeze_ops = {
682 .begin = acpi_freeze_begin,
683 .prepare = acpi_freeze_prepare,
684 .restore = acpi_freeze_restore,
685 .end = acpi_freeze_end,
686};
687
688static void acpi_sleep_suspend_setup(void)
689{
690 int i;
691
692 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
693 if (acpi_sleep_state_supported(i))
694 sleep_states[i] = 1;
695
696 suspend_set_ops(old_suspend_ordering ?
697 &acpi_suspend_ops_old : &acpi_suspend_ops);
698 freeze_set_ops(&acpi_freeze_ops);
699}
700
701#else /* !CONFIG_SUSPEND */
702static inline void acpi_sleep_suspend_setup(void) {}
703#endif /* !CONFIG_SUSPEND */
704
705#ifdef CONFIG_PM_SLEEP
706static u32 saved_bm_rld;
707
708static int acpi_save_bm_rld(void)
709{
710 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
711 return 0;
712}
713
714static void acpi_restore_bm_rld(void)
715{
716 u32 resumed_bm_rld = 0;
717
718 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
719 if (resumed_bm_rld == saved_bm_rld)
720 return;
721
722 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
723}
724
725static struct syscore_ops acpi_sleep_syscore_ops = {
726 .suspend = acpi_save_bm_rld,
727 .resume = acpi_restore_bm_rld,
728};
729
730void acpi_sleep_syscore_init(void)
731{
732 register_syscore_ops(&acpi_sleep_syscore_ops);
733}
734#else
735static inline void acpi_sleep_syscore_init(void) {}
736#endif /* CONFIG_PM_SLEEP */
737
738#ifdef CONFIG_HIBERNATION
739static unsigned long s4_hardware_signature;
740static struct acpi_table_facs *facs;
741static bool nosigcheck;
742
743void __init acpi_no_s4_hw_signature(void)
744{
745 nosigcheck = true;
746}
747
748static int acpi_hibernation_begin(void)
749{
750 int error;
751
752 error = nvs_nosave ? 0 : suspend_nvs_alloc();
753 if (!error)
754 acpi_pm_start(ACPI_STATE_S4);
755
756 return error;
757}
758
759static int acpi_hibernation_enter(void)
760{
761 acpi_status status = AE_OK;
762
763 ACPI_FLUSH_CPU_CACHE();
764
765 /* This shouldn't return. If it returns, we have a problem */
766 status = acpi_enter_sleep_state(ACPI_STATE_S4);
767 /* Reprogram control registers */
768 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
769
770 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
771}
772
773static void acpi_hibernation_leave(void)
774{
775 pm_set_resume_via_firmware();
776 /*
777 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
778 * enable it here.
779 */
780 acpi_enable();
781 /* Reprogram control registers */
782 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
783 /* Check the hardware signature */
784 if (facs && s4_hardware_signature != facs->hardware_signature)
785 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
786 /* Restore the NVS memory area */
787 suspend_nvs_restore();
788 /* Allow EC transactions to happen. */
789 acpi_ec_unblock_transactions();
790}
791
792static void acpi_pm_thaw(void)
793{
794 acpi_ec_unblock_transactions();
795 acpi_enable_all_runtime_gpes();
796}
797
798static const struct platform_hibernation_ops acpi_hibernation_ops = {
799 .begin = acpi_hibernation_begin,
800 .end = acpi_pm_end,
801 .pre_snapshot = acpi_pm_prepare,
802 .finish = acpi_pm_finish,
803 .prepare = acpi_pm_prepare,
804 .enter = acpi_hibernation_enter,
805 .leave = acpi_hibernation_leave,
806 .pre_restore = acpi_pm_freeze,
807 .restore_cleanup = acpi_pm_thaw,
808};
809
810/**
811 * acpi_hibernation_begin_old - Set the target system sleep state to
812 * ACPI_STATE_S4 and execute the _PTS control method. This
813 * function is used if the pre-ACPI 2.0 suspend ordering has been
814 * requested.
815 */
816static int acpi_hibernation_begin_old(void)
817{
818 int error;
819 /*
820 * The _TTS object should always be evaluated before the _PTS object.
821 * When the old_suspended_ordering is true, the _PTS object is
822 * evaluated in the acpi_sleep_prepare.
823 */
824 acpi_sleep_tts_switch(ACPI_STATE_S4);
825
826 error = acpi_sleep_prepare(ACPI_STATE_S4);
827
828 if (!error) {
829 if (!nvs_nosave)
830 error = suspend_nvs_alloc();
831 if (!error) {
832 acpi_target_sleep_state = ACPI_STATE_S4;
833 acpi_scan_lock_acquire();
834 }
835 }
836 return error;
837}
838
839/*
840 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
841 * been requested.
842 */
843static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
844 .begin = acpi_hibernation_begin_old,
845 .end = acpi_pm_end,
846 .pre_snapshot = acpi_pm_pre_suspend,
847 .prepare = acpi_pm_freeze,
848 .finish = acpi_pm_finish,
849 .enter = acpi_hibernation_enter,
850 .leave = acpi_hibernation_leave,
851 .pre_restore = acpi_pm_freeze,
852 .restore_cleanup = acpi_pm_thaw,
853 .recover = acpi_pm_finish,
854};
855
856static void acpi_sleep_hibernate_setup(void)
857{
858 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
859 return;
860
861 hibernation_set_ops(old_suspend_ordering ?
862 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
863 sleep_states[ACPI_STATE_S4] = 1;
864 if (nosigcheck)
865 return;
866
867 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
868 if (facs)
869 s4_hardware_signature = facs->hardware_signature;
870}
871#else /* !CONFIG_HIBERNATION */
872static inline void acpi_sleep_hibernate_setup(void) {}
873#endif /* !CONFIG_HIBERNATION */
874
875static void acpi_power_off_prepare(void)
876{
877 /* Prepare to power off the system */
878 acpi_sleep_prepare(ACPI_STATE_S5);
879 acpi_disable_all_gpes();
880 acpi_os_wait_events_complete();
881}
882
883static void acpi_power_off(void)
884{
885 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
886 printk(KERN_DEBUG "%s called\n", __func__);
887 local_irq_disable();
888 acpi_enter_sleep_state(ACPI_STATE_S5);
889}
890
891int __init acpi_sleep_init(void)
892{
893 char supported[ACPI_S_STATE_COUNT * 3 + 1];
894 char *pos = supported;
895 int i;
896
897 acpi_sleep_dmi_check();
898
899 sleep_states[ACPI_STATE_S0] = 1;
900
901 acpi_sleep_syscore_init();
902 acpi_sleep_suspend_setup();
903 acpi_sleep_hibernate_setup();
904
905 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
906 sleep_states[ACPI_STATE_S5] = 1;
907 pm_power_off_prepare = acpi_power_off_prepare;
908 pm_power_off = acpi_power_off;
909 } else {
910 acpi_no_s5 = true;
911 }
912
913 supported[0] = 0;
914 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
915 if (sleep_states[i])
916 pos += sprintf(pos, " S%d", i);
917 }
918 pr_info(PREFIX "(supports%s)\n", supported);
919
920 /*
921 * Register the tts_notifier to reboot notifier list so that the _TTS
922 * object can also be evaluated when the system enters S5.
923 */
924 register_reboot_notifier(&tts_notifier);
925 return 0;
926}