source: src/linux/universal/linux-4.9/drivers/acpi/sleep.c @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 3 months ago

kernel update

File size: 22.4 KB
Line 
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}
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