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- // 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
- */
- #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.
- */
- printk(KERN_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,
- };
- 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_wakeup_address = acpi_get_wakeup_address();
- if (!acpi_wakeup_address)
- return -EFAULT;
- acpi_set_waking_vector(acpi_wakeup_address);
- }
- ACPI_FLUSH_CPU_CACHE();
- #endif
- printk(KERN_INFO PREFIX "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 bool sleep_no_lps0 __read_mostly;
- module_param(sleep_no_lps0, bool, 0644);
- MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
- 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;
- }
- static 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"),
- },
- },
- /*
- * 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"),
- },
- },
- {},
- };
- 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_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;
- printk(KERN_INFO PREFIX "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;
- ACPI_FLUSH_CPU_CACHE();
- 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(PREFIX "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 and clear GPE status before interrupt is enabled. Some GPEs
- * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
- * acpi_leave_sleep_state will reenable specific GPEs later
- */
- acpi_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;
- /*
- * On platforms supporting the Low Power S0 Idle interface there is an ACPI
- * device object with the PNP0D80 compatible device ID (System Power Management
- * Controller) and a specific _DSM method under it. That method, if present,
- * can be used to indicate to the platform that the OS is transitioning into a
- * low-power state in which certain types of activity are not desirable or that
- * it is leaving such a state, which allows the platform to adjust its operation
- * mode accordingly.
- */
- static const struct acpi_device_id lps0_device_ids[] = {
- {"PNP0D80", },
- {"", },
- };
- #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
- #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
- #define ACPI_LPS0_SCREEN_OFF 3
- #define ACPI_LPS0_SCREEN_ON 4
- #define ACPI_LPS0_ENTRY 5
- #define ACPI_LPS0_EXIT 6
- static acpi_handle lps0_device_handle;
- static guid_t lps0_dsm_guid;
- static char lps0_dsm_func_mask;
- /* Device constraint entry structure */
- struct lpi_device_info {
- char *name;
- int enabled;
- union acpi_object *package;
- };
- /* Constraint package structure */
- struct lpi_device_constraint {
- int uid;
- int min_dstate;
- int function_states;
- };
- struct lpi_constraints {
- acpi_handle handle;
- int min_dstate;
- };
- static struct lpi_constraints *lpi_constraints_table;
- static int lpi_constraints_table_size;
- static void lpi_device_get_constraints(void)
- {
- union acpi_object *out_obj;
- int i;
- out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
- 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
- NULL, ACPI_TYPE_PACKAGE);
- acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
- out_obj ? "successful" : "failed");
- if (!out_obj)
- return;
- lpi_constraints_table = kcalloc(out_obj->package.count,
- sizeof(*lpi_constraints_table),
- GFP_KERNEL);
- if (!lpi_constraints_table)
- goto free_acpi_buffer;
- acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
- for (i = 0; i < out_obj->package.count; i++) {
- struct lpi_constraints *constraint;
- acpi_status status;
- union acpi_object *package = &out_obj->package.elements[i];
- struct lpi_device_info info = { };
- int package_count = 0, j;
- if (!package)
- continue;
- for (j = 0; j < package->package.count; ++j) {
- union acpi_object *element =
- &(package->package.elements[j]);
- switch (element->type) {
- case ACPI_TYPE_INTEGER:
- info.enabled = element->integer.value;
- break;
- case ACPI_TYPE_STRING:
- info.name = element->string.pointer;
- break;
- case ACPI_TYPE_PACKAGE:
- package_count = element->package.count;
- info.package = element->package.elements;
- break;
- }
- }
- if (!info.enabled || !info.package || !info.name)
- continue;
- constraint = &lpi_constraints_table[lpi_constraints_table_size];
- status = acpi_get_handle(NULL, info.name, &constraint->handle);
- if (ACPI_FAILURE(status))
- continue;
- acpi_handle_debug(lps0_device_handle,
- "index:%d Name:%s\n", i, info.name);
- constraint->min_dstate = -1;
- for (j = 0; j < package_count; ++j) {
- union acpi_object *info_obj = &info.package[j];
- union acpi_object *cnstr_pkg;
- union acpi_object *obj;
- struct lpi_device_constraint dev_info;
- switch (info_obj->type) {
- case ACPI_TYPE_INTEGER:
- /* version */
- break;
- case ACPI_TYPE_PACKAGE:
- if (info_obj->package.count < 2)
- break;
- cnstr_pkg = info_obj->package.elements;
- obj = &cnstr_pkg[0];
- dev_info.uid = obj->integer.value;
- obj = &cnstr_pkg[1];
- dev_info.min_dstate = obj->integer.value;
- acpi_handle_debug(lps0_device_handle,
- "uid:%d min_dstate:%s\n",
- dev_info.uid,
- acpi_power_state_string(dev_info.min_dstate));
- constraint->min_dstate = dev_info.min_dstate;
- break;
- }
- }
- if (constraint->min_dstate < 0) {
- acpi_handle_debug(lps0_device_handle,
- "Incomplete constraint defined\n");
- continue;
- }
- lpi_constraints_table_size++;
- }
- acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
- free_acpi_buffer:
- ACPI_FREE(out_obj);
- }
- static void lpi_check_constraints(void)
- {
- int i;
- for (i = 0; i < lpi_constraints_table_size; ++i) {
- acpi_handle handle = lpi_constraints_table[i].handle;
- struct acpi_device *adev;
- if (!handle || acpi_bus_get_device(handle, &adev))
- continue;
- acpi_handle_debug(handle,
- "LPI: required min power state:%s current power state:%s\n",
- acpi_power_state_string(lpi_constraints_table[i].min_dstate),
- acpi_power_state_string(adev->power.state));
- if (!adev->flags.power_manageable) {
- acpi_handle_info(handle, "LPI: Device not power manageable\n");
- lpi_constraints_table[i].handle = NULL;
- continue;
- }
- if (adev->power.state < lpi_constraints_table[i].min_dstate)
- acpi_handle_info(handle,
- "LPI: Constraint not met; min power state:%s current power state:%s\n",
- acpi_power_state_string(lpi_constraints_table[i].min_dstate),
- acpi_power_state_string(adev->power.state));
- }
- }
- static void acpi_sleep_run_lps0_dsm(unsigned int func)
- {
- union acpi_object *out_obj;
- if (!(lps0_dsm_func_mask & (1 << func)))
- return;
- out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
- ACPI_FREE(out_obj);
- acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
- func, out_obj ? "successful" : "failed");
- }
- static int lps0_device_attach(struct acpi_device *adev,
- const struct acpi_device_id *not_used)
- {
- union acpi_object *out_obj;
- if (lps0_device_handle)
- return 0;
- if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
- return 0;
- guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
- /* Check if the _DSM is present and as expected. */
- out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
- if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
- acpi_handle_debug(adev->handle,
- "_DSM function 0 evaluation failed\n");
- return 0;
- }
- lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
- ACPI_FREE(out_obj);
- acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
- lps0_dsm_func_mask);
- lps0_device_handle = adev->handle;
- lpi_device_get_constraints();
- /*
- * Use suspend-to-idle by default if the default suspend mode was not
- * set from the command line.
- */
- if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
- mem_sleep_current = PM_SUSPEND_TO_IDLE;
- /*
- * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
- * EC GPE to be enabled while suspended for certain wakeup devices to
- * work, so mark it as wakeup-capable.
- */
- acpi_ec_mark_gpe_for_wake();
- return 0;
- }
- static struct acpi_scan_handler lps0_handler = {
- .ids = lps0_device_ids,
- .attach = lps0_device_attach,
- };
- static int acpi_s2idle_begin(void)
- {
- acpi_scan_lock_acquire();
- return 0;
- }
- static int acpi_s2idle_prepare(void)
- {
- if (acpi_sci_irq_valid()) {
- enable_irq_wake(acpi_sci_irq);
- 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;
- }
- static int acpi_s2idle_prepare_late(void)
- {
- if (!lps0_device_handle || sleep_no_lps0)
- return 0;
- if (pm_debug_messages_on)
- lpi_check_constraints();
- acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
- acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
- return 0;
- }
- static 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 dispatch the EC GPE. */
- if (acpi_ec_dispatch_gpe()) {
- pm_pr_dbg("ACPI non-EC GPE wakeup\n");
- return true;
- }
- /*
- * Cancel the SCI wakeup and process all pending events in case
- * there are any wakeup ones in there.
- *
- * Note that if any non-EC GPEs are active at this point, the
- * SCI will retrigger after the rearming below, so no events
- * should be missed by canceling the wakeup here.
- */
- pm_system_cancel_wakeup();
- 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_wakeup_clear(acpi_sci_irq);
- rearm_wake_irq(acpi_sci_irq);
- }
- return false;
- }
- static void acpi_s2idle_restore_early(void)
- {
- if (!lps0_device_handle || sleep_no_lps0)
- return;
- acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
- acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
- }
- static 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);
- }
- }
- static 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,
- .prepare_late = acpi_s2idle_prepare_late,
- .wake = acpi_s2idle_wake,
- .restore_early = acpi_s2idle_restore_early,
- .restore = acpi_s2idle_restore,
- .end = acpi_s2idle_end,
- };
- static void acpi_sleep_suspend_setup(void)
- {
- int i;
- for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
- if (acpi_sleep_state_supported(i))
- sleep_states[i] = 1;
- suspend_set_ops(old_suspend_ordering ?
- &acpi_suspend_ops_old : &acpi_suspend_ops);
- acpi_scan_add_handler(&lps0_handler);
- s2idle_set_ops(&acpi_s2idle_ops);
- }
- #else /* !CONFIG_SUSPEND */
- #define s2idle_wakeup (false)
- #define lps0_device_handle (NULL)
- 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;
- static bool nosigcheck;
- void __init acpi_no_s4_hw_signature(void)
- {
- nosigcheck = true;
- }
- 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;
- ACPI_FLUSH_CPU_CACHE();
- /* 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("ACPI: 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 (nosigcheck)
- return;
- acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
- if (facs)
- s4_hardware_signature = facs->hardware_signature;
- }
- #else /* !CONFIG_HIBERNATION */
- static inline void acpi_sleep_hibernate_setup(void) {}
- #endif /* !CONFIG_HIBERNATION */
- static void acpi_power_off_prepare(void)
- {
- /* Prepare to power off the system */
- acpi_sleep_prepare(ACPI_STATE_S5);
- acpi_disable_all_gpes();
- acpi_os_wait_events_complete();
- }
- static void acpi_power_off(void)
- {
- /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
- printk(KERN_DEBUG "%s called\n", __func__);
- local_irq_disable();
- acpi_enter_sleep_state(ACPI_STATE_S5);
- }
- 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;
- pm_power_off_prepare = acpi_power_off_prepare;
- pm_power_off = acpi_power_off;
- } 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(PREFIX "(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;
- }
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