diff options
Diffstat (limited to 'drivers/acpi/sleep.c')
| -rw-r--r-- | drivers/acpi/sleep.c | 1134 |
1 files changed, 1134 insertions, 0 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c new file mode 100644 index 0000000000..808484d112 --- /dev/null +++ b/drivers/acpi/sleep.c @@ -0,0 +1,1134 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sleep.c - ACPI sleep support. + * + * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> + * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> + * Copyright (c) 2000-2003 Patrick Mochel + * Copyright (c) 2003 Open Source Development Lab + */ + +#define pr_fmt(fmt) "ACPI: PM: " fmt + +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/dmi.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/suspend.h> +#include <linux/reboot.h> +#include <linux/acpi.h> +#include <linux/module.h> +#include <linux/syscore_ops.h> +#include <asm/io.h> +#include <trace/events/power.h> + +#include "internal.h" +#include "sleep.h" + +/* + * Some HW-full platforms do not have _S5, so they may need + * to leverage efi power off for a shutdown. + */ +bool acpi_no_s5; +static u8 sleep_states[ACPI_S_STATE_COUNT]; + +static void acpi_sleep_tts_switch(u32 acpi_state) +{ + acpi_status status; + + status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + /* + * OS can't evaluate the _TTS object correctly. Some warning + * message will be printed. But it won't break anything. + */ + pr_notice("Failure in evaluating _TTS object\n"); + } +} + +static int tts_notify_reboot(struct notifier_block *this, + unsigned long code, void *x) +{ + acpi_sleep_tts_switch(ACPI_STATE_S5); + return NOTIFY_DONE; +} + +static struct notifier_block tts_notifier = { + .notifier_call = tts_notify_reboot, + .next = NULL, + .priority = 0, +}; + +#ifndef acpi_skip_set_wakeup_address +#define acpi_skip_set_wakeup_address() false +#endif + +static int acpi_sleep_prepare(u32 acpi_state) +{ +#ifdef CONFIG_ACPI_SLEEP + unsigned long acpi_wakeup_address; + + /* do we have a wakeup address for S2 and S3? */ + if (acpi_state == ACPI_STATE_S3 && !acpi_skip_set_wakeup_address()) { + acpi_wakeup_address = acpi_get_wakeup_address(); + if (!acpi_wakeup_address) + return -EFAULT; + acpi_set_waking_vector(acpi_wakeup_address); + + } +#endif + pr_info("Preparing to enter system sleep state S%d\n", acpi_state); + acpi_enable_wakeup_devices(acpi_state); + acpi_enter_sleep_state_prep(acpi_state); + return 0; +} + +bool acpi_sleep_state_supported(u8 sleep_state) +{ + acpi_status status; + u8 type_a, type_b; + + status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b); + return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware + || (acpi_gbl_FADT.sleep_control.address + && acpi_gbl_FADT.sleep_status.address)); +} + +#ifdef CONFIG_ACPI_SLEEP +static u32 acpi_target_sleep_state = ACPI_STATE_S0; + +u32 acpi_target_system_state(void) +{ + return acpi_target_sleep_state; +} +EXPORT_SYMBOL_GPL(acpi_target_system_state); + +static bool pwr_btn_event_pending; + +/* + * The ACPI specification wants us to save NVS memory regions during hibernation + * and to restore them during the subsequent resume. Windows does that also for + * suspend to RAM. However, it is known that this mechanism does not work on + * all machines, so we allow the user to disable it with the help of the + * 'acpi_sleep=nonvs' kernel command line option. + */ +static bool nvs_nosave; + +void __init acpi_nvs_nosave(void) +{ + nvs_nosave = true; +} + +/* + * The ACPI specification wants us to save NVS memory regions during hibernation + * but says nothing about saving NVS during S3. Not all versions of Windows + * save NVS on S3 suspend either, and it is clear that not all systems need + * NVS to be saved at S3 time. To improve suspend/resume time, allow the + * user to disable saving NVS on S3 if their system does not require it, but + * continue to save/restore NVS for S4 as specified. + */ +static bool nvs_nosave_s3; + +void __init acpi_nvs_nosave_s3(void) +{ + nvs_nosave_s3 = true; +} + +static int __init init_nvs_save_s3(const struct dmi_system_id *d) +{ + nvs_nosave_s3 = false; + return 0; +} + +/* + * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the + * user to request that behavior by using the 'acpi_old_suspend_ordering' + * kernel command line option that causes the following variable to be set. + */ +static bool old_suspend_ordering; + +void __init acpi_old_suspend_ordering(void) +{ + old_suspend_ordering = true; +} + +static int __init init_old_suspend_ordering(const struct dmi_system_id *d) +{ + acpi_old_suspend_ordering(); + return 0; +} + +static int __init init_nvs_nosave(const struct dmi_system_id *d) +{ + acpi_nvs_nosave(); + return 0; +} + +bool acpi_sleep_default_s3; + +static int __init init_default_s3(const struct dmi_system_id *d) +{ + acpi_sleep_default_s3 = true; + return 0; +} + +static const struct dmi_system_id acpisleep_dmi_table[] __initconst = { + { + .callback = init_old_suspend_ordering, + .ident = "Abit KN9 (nForce4 variant)", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), + DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), + }, + }, + { + .callback = init_old_suspend_ordering, + .ident = "HP xw4600 Workstation", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), + }, + }, + { + .callback = init_old_suspend_ordering, + .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), + }, + }, + { + .callback = init_old_suspend_ordering, + .ident = "Panasonic CF51-2L", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, + "Matsushita Electric Industrial Co.,Ltd."), + DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-FW41E_H", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-FW21E", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-FW21M", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VPCEB17FX", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-SR11M", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Everex StepNote Series", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VPCEB1Z1E", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-NW130D", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VPCCW29FX", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Averatec AV1020-ED2", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), + DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), + }, + }, + { + .callback = init_old_suspend_ordering, + .ident = "Asus A8N-SLI DELUXE", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), + }, + }, + { + .callback = init_old_suspend_ordering, + .ident = "Asus A8N-SLI Premium", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-SR26GN_P", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VPCEB1S1E", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Sony Vaio VGN-FW520F", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Asus K54C", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), + }, + }, + { + .callback = init_nvs_nosave, + .ident = "Asus K54HR", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), + }, + }, + { + .callback = init_nvs_save_s3, + .ident = "Asus 1025C", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), + DMI_MATCH(DMI_PRODUCT_NAME, "1025C"), + }, + }, + /* + * https://bugzilla.kernel.org/show_bug.cgi?id=189431 + * Lenovo G50-45 is a platform later than 2012, but needs nvs memory + * saving during S3. + */ + { + .callback = init_nvs_save_s3, + .ident = "Lenovo G50-45", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "80E3"), + }, + }, + { + .callback = init_nvs_save_s3, + .ident = "Lenovo G40-45", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "80E1"), + }, + }, + /* + * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using + * the Low Power S0 Idle firmware interface (see + * https://bugzilla.kernel.org/show_bug.cgi?id=199057). + */ + { + .callback = init_default_s3, + .ident = "ThinkPad X1 Tablet(2016)", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"), + }, + }, + /* + * ASUS B1400CEAE hangs on resume from suspend (see + * https://bugzilla.kernel.org/show_bug.cgi?id=215742). + */ + { + .callback = init_default_s3, + .ident = "ASUS B1400CEAE", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), + DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"), + }, + }, + {}, +}; + +static bool ignore_blacklist; + +void __init acpi_sleep_no_blacklist(void) +{ + ignore_blacklist = true; +} + +static void __init acpi_sleep_dmi_check(void) +{ + if (ignore_blacklist) + return; + + if (dmi_get_bios_year() >= 2012) + acpi_nvs_nosave_s3(); + + dmi_check_system(acpisleep_dmi_table); +} + +/** + * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. + */ +static int acpi_pm_freeze(void) +{ + acpi_disable_all_gpes(); + acpi_os_wait_events_complete(); + acpi_ec_block_transactions(); + return 0; +} + +/** + * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. + */ +static int acpi_pm_pre_suspend(void) +{ + acpi_pm_freeze(); + return suspend_nvs_save(); +} + +/** + * __acpi_pm_prepare - Prepare the platform to enter the target state. + * + * If necessary, set the firmware waking vector and do arch-specific + * nastiness to get the wakeup code to the waking vector. + */ +static int __acpi_pm_prepare(void) +{ + int error = acpi_sleep_prepare(acpi_target_sleep_state); + if (error) + acpi_target_sleep_state = ACPI_STATE_S0; + + return error; +} + +/** + * acpi_pm_prepare - Prepare the platform to enter the target sleep + * state and disable the GPEs. + */ +static int acpi_pm_prepare(void) +{ + int error = __acpi_pm_prepare(); + if (!error) + error = acpi_pm_pre_suspend(); + + return error; +} + +/** + * acpi_pm_finish - Instruct the platform to leave a sleep state. + * + * This is called after we wake back up (or if entering the sleep state + * failed). + */ +static void acpi_pm_finish(void) +{ + struct acpi_device *pwr_btn_adev; + u32 acpi_state = acpi_target_sleep_state; + + acpi_ec_unblock_transactions(); + suspend_nvs_free(); + + if (acpi_state == ACPI_STATE_S0) + return; + + pr_info("Waking up from system sleep state S%d\n", acpi_state); + acpi_disable_wakeup_devices(acpi_state); + acpi_leave_sleep_state(acpi_state); + + /* reset firmware waking vector */ + acpi_set_waking_vector(0); + + acpi_target_sleep_state = ACPI_STATE_S0; + + acpi_resume_power_resources(); + + /* If we were woken with the fixed power button, provide a small + * hint to userspace in the form of a wakeup event on the fixed power + * button device (if it can be found). + * + * We delay the event generation til now, as the PM layer requires + * timekeeping to be running before we generate events. */ + if (!pwr_btn_event_pending) + return; + + pwr_btn_event_pending = false; + pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF, + NULL, -1); + if (pwr_btn_adev) { + pm_wakeup_event(&pwr_btn_adev->dev, 0); + acpi_dev_put(pwr_btn_adev); + } +} + +/** + * acpi_pm_start - Start system PM transition. + */ +static void acpi_pm_start(u32 acpi_state) +{ + acpi_target_sleep_state = acpi_state; + acpi_sleep_tts_switch(acpi_target_sleep_state); + acpi_scan_lock_acquire(); +} + +/** + * acpi_pm_end - Finish up system PM transition. + */ +static void acpi_pm_end(void) +{ + acpi_turn_off_unused_power_resources(); + acpi_scan_lock_release(); + /* + * This is necessary in case acpi_pm_finish() is not called during a + * failing transition to a sleep state. + */ + acpi_target_sleep_state = ACPI_STATE_S0; + acpi_sleep_tts_switch(acpi_target_sleep_state); +} +#else /* !CONFIG_ACPI_SLEEP */ +#define sleep_no_lps0 (1) +#define acpi_target_sleep_state ACPI_STATE_S0 +#define acpi_sleep_default_s3 (1) +static inline void acpi_sleep_dmi_check(void) {} +#endif /* CONFIG_ACPI_SLEEP */ + +#ifdef CONFIG_SUSPEND +static u32 acpi_suspend_states[] = { + [PM_SUSPEND_ON] = ACPI_STATE_S0, + [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, + [PM_SUSPEND_MEM] = ACPI_STATE_S3, + [PM_SUSPEND_MAX] = ACPI_STATE_S5 +}; + +/** + * acpi_suspend_begin - Set the target system sleep state to the state + * associated with given @pm_state, if supported. + */ +static int acpi_suspend_begin(suspend_state_t pm_state) +{ + u32 acpi_state = acpi_suspend_states[pm_state]; + int error; + + error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); + if (error) + return error; + + if (!sleep_states[acpi_state]) { + pr_err("ACPI does not support sleep state S%u\n", acpi_state); + return -ENOSYS; + } + if (acpi_state > ACPI_STATE_S1) + pm_set_suspend_via_firmware(); + + acpi_pm_start(acpi_state); + return 0; +} + +/** + * acpi_suspend_enter - Actually enter a sleep state. + * @pm_state: ignored + * + * Flush caches and go to sleep. For STR we have to call arch-specific + * assembly, which in turn call acpi_enter_sleep_state(). + * It's unfortunate, but it works. Please fix if you're feeling frisky. + */ +static int acpi_suspend_enter(suspend_state_t pm_state) +{ + acpi_status status = AE_OK; + u32 acpi_state = acpi_target_sleep_state; + int error; + + trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); + switch (acpi_state) { + case ACPI_STATE_S1: + barrier(); + status = acpi_enter_sleep_state(acpi_state); + break; + + case ACPI_STATE_S3: + if (!acpi_suspend_lowlevel) + return -ENOSYS; + error = acpi_suspend_lowlevel(); + if (error) + return error; + pr_info("Low-level resume complete\n"); + pm_set_resume_via_firmware(); + break; + } + trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false); + + /* This violates the spec but is required for bug compatibility. */ + acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); + + /* Reprogram control registers */ + acpi_leave_sleep_state_prep(acpi_state); + + /* ACPI 3.0 specs (P62) says that it's the responsibility + * of the OSPM to clear the status bit [ implying that the + * POWER_BUTTON event should not reach userspace ] + * + * However, we do generate a small hint for userspace in the form of + * a wakeup event. We flag this condition for now and generate the + * event later, as we're currently too early in resume to be able to + * generate wakeup events. + */ + if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { + acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED; + + acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); + + if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) { + acpi_clear_event(ACPI_EVENT_POWER_BUTTON); + /* Flag for later */ + pwr_btn_event_pending = true; + } + } + + /* + * Disable all GPE and clear their status bits before interrupts are + * enabled. Some GPEs (like wakeup GPEs) have no handlers and this can + * prevent them from producing spurious interrups. + * + * acpi_leave_sleep_state() will reenable specific GPEs later. + * + * Because this code runs on one CPU with disabled interrupts (all of + * the other CPUs are offline at this time), it need not acquire any + * sleeping locks which may trigger an implicit preemption point even + * if there is no contention, so avoid doing that by using a low-level + * library routine here. + */ + acpi_hw_disable_all_gpes(); + /* Allow EC transactions to happen. */ + acpi_ec_unblock_transactions(); + + suspend_nvs_restore(); + + return ACPI_SUCCESS(status) ? 0 : -EFAULT; +} + +static int acpi_suspend_state_valid(suspend_state_t pm_state) +{ + u32 acpi_state; + + switch (pm_state) { + case PM_SUSPEND_ON: + case PM_SUSPEND_STANDBY: + case PM_SUSPEND_MEM: + acpi_state = acpi_suspend_states[pm_state]; + + return sleep_states[acpi_state]; + default: + return 0; + } +} + +static const struct platform_suspend_ops acpi_suspend_ops = { + .valid = acpi_suspend_state_valid, + .begin = acpi_suspend_begin, + .prepare_late = acpi_pm_prepare, + .enter = acpi_suspend_enter, + .wake = acpi_pm_finish, + .end = acpi_pm_end, +}; + +/** + * acpi_suspend_begin_old - Set the target system sleep state to the + * state associated with given @pm_state, if supported, and + * execute the _PTS control method. This function is used if the + * pre-ACPI 2.0 suspend ordering has been requested. + */ +static int acpi_suspend_begin_old(suspend_state_t pm_state) +{ + int error = acpi_suspend_begin(pm_state); + if (!error) + error = __acpi_pm_prepare(); + + return error; +} + +/* + * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has + * been requested. + */ +static const struct platform_suspend_ops acpi_suspend_ops_old = { + .valid = acpi_suspend_state_valid, + .begin = acpi_suspend_begin_old, + .prepare_late = acpi_pm_pre_suspend, + .enter = acpi_suspend_enter, + .wake = acpi_pm_finish, + .end = acpi_pm_end, + .recover = acpi_pm_finish, +}; + +static bool s2idle_wakeup; + +int acpi_s2idle_begin(void) +{ + acpi_scan_lock_acquire(); + return 0; +} + +int acpi_s2idle_prepare(void) +{ + if (acpi_sci_irq_valid()) { + int error; + + error = enable_irq_wake(acpi_sci_irq); + if (error) + pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n", + acpi_sci_irq, error); + + acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE); + } + + acpi_enable_wakeup_devices(ACPI_STATE_S0); + + /* Change the configuration of GPEs to avoid spurious wakeup. */ + acpi_enable_all_wakeup_gpes(); + acpi_os_wait_events_complete(); + + s2idle_wakeup = true; + return 0; +} + +bool acpi_s2idle_wake(void) +{ + if (!acpi_sci_irq_valid()) + return pm_wakeup_pending(); + + while (pm_wakeup_pending()) { + /* + * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the + * SCI has not triggered while suspended, so bail out (the + * wakeup is pending anyway and the SCI is not the source of + * it). + */ + if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) { + pm_pr_dbg("Wakeup unrelated to ACPI SCI\n"); + return true; + } + + /* + * If the status bit of any enabled fixed event is set, the + * wakeup is regarded as valid. + */ + if (acpi_any_fixed_event_status_set()) { + pm_pr_dbg("ACPI fixed event wakeup\n"); + return true; + } + + /* Check wakeups from drivers sharing the SCI. */ + if (acpi_check_wakeup_handlers()) { + pm_pr_dbg("ACPI custom handler wakeup\n"); + return true; + } + + /* + * Check non-EC GPE wakeups and if there are none, cancel the + * SCI-related wakeup and dispatch the EC GPE. + */ + if (acpi_ec_dispatch_gpe()) { + pm_pr_dbg("ACPI non-EC GPE wakeup\n"); + return true; + } + + acpi_os_wait_events_complete(); + + /* + * The SCI is in the "suspended" state now and it cannot produce + * new wakeup events till the rearming below, so if any of them + * are pending here, they must be resulting from the processing + * of EC events above or coming from somewhere else. + */ + if (pm_wakeup_pending()) { + pm_pr_dbg("Wakeup after ACPI Notify sync\n"); + return true; + } + + pm_pr_dbg("Rearming ACPI SCI for wakeup\n"); + + pm_wakeup_clear(acpi_sci_irq); + rearm_wake_irq(acpi_sci_irq); + } + + return false; +} + +void acpi_s2idle_restore(void) +{ + /* + * Drain pending events before restoring the working-state configuration + * of GPEs. + */ + acpi_os_wait_events_complete(); /* synchronize GPE processing */ + acpi_ec_flush_work(); /* flush the EC driver's workqueues */ + acpi_os_wait_events_complete(); /* synchronize Notify handling */ + + s2idle_wakeup = false; + + acpi_enable_all_runtime_gpes(); + + acpi_disable_wakeup_devices(ACPI_STATE_S0); + + if (acpi_sci_irq_valid()) { + acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE); + disable_irq_wake(acpi_sci_irq); + } +} + +void acpi_s2idle_end(void) +{ + acpi_scan_lock_release(); +} + +static const struct platform_s2idle_ops acpi_s2idle_ops = { + .begin = acpi_s2idle_begin, + .prepare = acpi_s2idle_prepare, + .wake = acpi_s2idle_wake, + .restore = acpi_s2idle_restore, + .end = acpi_s2idle_end, +}; + +void __weak acpi_s2idle_setup(void) +{ + if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) + pr_info("Efficient low-power S0 idle declared\n"); + + s2idle_set_ops(&acpi_s2idle_ops); +} + +static void __init acpi_sleep_suspend_setup(void) +{ + bool suspend_ops_needed = false; + int i; + + for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) + if (acpi_sleep_state_supported(i)) { + sleep_states[i] = 1; + suspend_ops_needed = true; + } + + if (suspend_ops_needed) + suspend_set_ops(old_suspend_ordering ? + &acpi_suspend_ops_old : &acpi_suspend_ops); + + acpi_s2idle_setup(); +} + +#else /* !CONFIG_SUSPEND */ +#define s2idle_wakeup (false) +static inline void acpi_sleep_suspend_setup(void) {} +#endif /* !CONFIG_SUSPEND */ + +bool acpi_s2idle_wakeup(void) +{ + return s2idle_wakeup; +} + +#ifdef CONFIG_PM_SLEEP +static u32 saved_bm_rld; + +static int acpi_save_bm_rld(void) +{ + acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); + return 0; +} + +static void acpi_restore_bm_rld(void) +{ + u32 resumed_bm_rld = 0; + + acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); + if (resumed_bm_rld == saved_bm_rld) + return; + + acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); +} + +static struct syscore_ops acpi_sleep_syscore_ops = { + .suspend = acpi_save_bm_rld, + .resume = acpi_restore_bm_rld, +}; + +static void acpi_sleep_syscore_init(void) +{ + register_syscore_ops(&acpi_sleep_syscore_ops); +} +#else +static inline void acpi_sleep_syscore_init(void) {} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_HIBERNATION +static unsigned long s4_hardware_signature; +static struct acpi_table_facs *facs; +int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */ + +static int acpi_hibernation_begin(pm_message_t stage) +{ + if (!nvs_nosave) { + int error = suspend_nvs_alloc(); + if (error) + return error; + } + + if (stage.event == PM_EVENT_HIBERNATE) + pm_set_suspend_via_firmware(); + + acpi_pm_start(ACPI_STATE_S4); + return 0; +} + +static int acpi_hibernation_enter(void) +{ + acpi_status status = AE_OK; + + /* This shouldn't return. If it returns, we have a problem */ + status = acpi_enter_sleep_state(ACPI_STATE_S4); + /* Reprogram control registers */ + acpi_leave_sleep_state_prep(ACPI_STATE_S4); + + return ACPI_SUCCESS(status) ? 0 : -EFAULT; +} + +static void acpi_hibernation_leave(void) +{ + pm_set_resume_via_firmware(); + /* + * If ACPI is not enabled by the BIOS and the boot kernel, we need to + * enable it here. + */ + acpi_enable(); + /* Reprogram control registers */ + acpi_leave_sleep_state_prep(ACPI_STATE_S4); + /* Check the hardware signature */ + if (facs && s4_hardware_signature != facs->hardware_signature) + pr_crit("Hardware changed while hibernated, success doubtful!\n"); + /* Restore the NVS memory area */ + suspend_nvs_restore(); + /* Allow EC transactions to happen. */ + acpi_ec_unblock_transactions(); +} + +static void acpi_pm_thaw(void) +{ + acpi_ec_unblock_transactions(); + acpi_enable_all_runtime_gpes(); +} + +static const struct platform_hibernation_ops acpi_hibernation_ops = { + .begin = acpi_hibernation_begin, + .end = acpi_pm_end, + .pre_snapshot = acpi_pm_prepare, + .finish = acpi_pm_finish, + .prepare = acpi_pm_prepare, + .enter = acpi_hibernation_enter, + .leave = acpi_hibernation_leave, + .pre_restore = acpi_pm_freeze, + .restore_cleanup = acpi_pm_thaw, +}; + +/** + * acpi_hibernation_begin_old - Set the target system sleep state to + * ACPI_STATE_S4 and execute the _PTS control method. This + * function is used if the pre-ACPI 2.0 suspend ordering has been + * requested. + */ +static int acpi_hibernation_begin_old(pm_message_t stage) +{ + int error; + /* + * The _TTS object should always be evaluated before the _PTS object. + * When the old_suspended_ordering is true, the _PTS object is + * evaluated in the acpi_sleep_prepare. + */ + acpi_sleep_tts_switch(ACPI_STATE_S4); + + error = acpi_sleep_prepare(ACPI_STATE_S4); + if (error) + return error; + + if (!nvs_nosave) { + error = suspend_nvs_alloc(); + if (error) + return error; + } + + if (stage.event == PM_EVENT_HIBERNATE) + pm_set_suspend_via_firmware(); + + acpi_target_sleep_state = ACPI_STATE_S4; + acpi_scan_lock_acquire(); + return 0; +} + +/* + * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has + * been requested. + */ +static const struct platform_hibernation_ops acpi_hibernation_ops_old = { + .begin = acpi_hibernation_begin_old, + .end = acpi_pm_end, + .pre_snapshot = acpi_pm_pre_suspend, + .prepare = acpi_pm_freeze, + .finish = acpi_pm_finish, + .enter = acpi_hibernation_enter, + .leave = acpi_hibernation_leave, + .pre_restore = acpi_pm_freeze, + .restore_cleanup = acpi_pm_thaw, + .recover = acpi_pm_finish, +}; + +static void acpi_sleep_hibernate_setup(void) +{ + if (!acpi_sleep_state_supported(ACPI_STATE_S4)) + return; + + hibernation_set_ops(old_suspend_ordering ? + &acpi_hibernation_ops_old : &acpi_hibernation_ops); + sleep_states[ACPI_STATE_S4] = 1; + if (!acpi_check_s4_hw_signature) + return; + + acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); + if (facs) { + /* + * s4_hardware_signature is the local variable which is just + * used to warn about mismatch after we're attempting to + * resume (in violation of the ACPI specification.) + */ + s4_hardware_signature = facs->hardware_signature; + + if (acpi_check_s4_hw_signature > 0) { + /* + * If we're actually obeying the ACPI specification + * then the signature is written out as part of the + * swsusp header, in order to allow the boot kernel + * to gracefully decline to resume. + */ + swsusp_hardware_signature = facs->hardware_signature; + } + } +} +#else /* !CONFIG_HIBERNATION */ +static inline void acpi_sleep_hibernate_setup(void) {} +#endif /* !CONFIG_HIBERNATION */ + +static int acpi_power_off_prepare(struct sys_off_data *data) +{ + /* Prepare to power off the system */ + acpi_sleep_prepare(ACPI_STATE_S5); + acpi_disable_all_gpes(); + acpi_os_wait_events_complete(); + return NOTIFY_DONE; +} + +static int acpi_power_off(struct sys_off_data *data) +{ + /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ + pr_debug("%s called\n", __func__); + local_irq_disable(); + acpi_enter_sleep_state(ACPI_STATE_S5); + return NOTIFY_DONE; +} + +int __init acpi_sleep_init(void) +{ + char supported[ACPI_S_STATE_COUNT * 3 + 1]; + char *pos = supported; + int i; + + acpi_sleep_dmi_check(); + + sleep_states[ACPI_STATE_S0] = 1; + + acpi_sleep_syscore_init(); + acpi_sleep_suspend_setup(); + acpi_sleep_hibernate_setup(); + + if (acpi_sleep_state_supported(ACPI_STATE_S5)) { + sleep_states[ACPI_STATE_S5] = 1; + + register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE, + SYS_OFF_PRIO_FIRMWARE, + acpi_power_off_prepare, NULL); + + register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, + SYS_OFF_PRIO_FIRMWARE, + acpi_power_off, NULL); + + /* + * Windows uses S5 for reboot, so some BIOSes depend on it to + * perform proper reboot. + */ + register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE, + SYS_OFF_PRIO_FIRMWARE, + acpi_power_off_prepare, NULL); + } else { + acpi_no_s5 = true; + } + + supported[0] = 0; + for (i = 0; i < ACPI_S_STATE_COUNT; i++) { + if (sleep_states[i]) + pos += sprintf(pos, " S%d", i); + } + pr_info("(supports%s)\n", supported); + + /* + * Register the tts_notifier to reboot notifier list so that the _TTS + * object can also be evaluated when the system enters S5. + */ + register_reboot_notifier(&tts_notifier); + return 0; +} |