/* * sleep.c - ACPI sleep support. * * Copyright (c) 2005 Alexey Starikovskiy * Copyright (c) 2004 David Shaohua Li * Copyright (c) 2000-2003 Patrick Mochel * Copyright (c) 2003 Open Source Development Lab * * This file is released under the GPLv2. * */ #include #include #include #include #include #include #include #include #include #include #include #include #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 /* do we have a wakeup address for S2 and S3? */ if (acpi_state == ACPI_STATE_S3) { 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; } static 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; } static bool acpi_sleep_no_lps0; static int __init init_no_lps0(const struct dmi_system_id *d) { acpi_sleep_no_lps0 = 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"), }, }, /* * 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"), }, }, /* * https://bugzilla.kernel.org/show_bug.cgi?id=196907 * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power * S0 Idle firmware interface. */ { .callback = init_no_lps0, .ident = "Dell XPS13 9360", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"), }, }, {}, }; static bool ignore_blacklist; void __init acpi_sleep_no_blacklist(void) { ignore_blacklist = true; } static void __init acpi_sleep_dmi_check(void) { int year; if (ignore_blacklist) return; if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && 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; } static int find_powerf_dev(struct device *dev, void *data) { struct acpi_device *device = to_acpi_device(dev); const char *hid = acpi_device_hid(device); return !strcmp(hid, ACPI_BUTTON_HID_POWERF); } /** * 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 device *pwr_btn_dev; 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_dev = bus_find_device(&acpi_bus_type, NULL, NULL, find_powerf_dev); if (pwr_btn_dev) { pm_wakeup_event(pwr_btn_dev, 0); put_device(pwr_btn_dev); } } /** * 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 acpi_target_sleep_state ACPI_STATE_S0 #define acpi_sleep_no_lps0 (false) 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_in_progress; 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 #define ACPI_S2IDLE_FUNC_MASK ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT)) 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) { struct acpi_device *adev; if (acpi_bus_get_device(lpi_constraints_table[i].handle, &adev)) continue; acpi_handle_debug(adev->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(adev->handle, "LPI: Device not power manageble\n"); continue; } if (adev->power.state < lpi_constraints_table[i].min_dstate) acpi_handle_info(adev->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_sleep_no_lps0) { acpi_handle_info(adev->handle, "Low Power S0 Idle interface disabled\n"); 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) { char bitmask = *(char *)out_obj->buffer.pointer; if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) { lps0_dsm_func_mask = bitmask; lps0_device_handle = adev->handle; /* * 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) mem_sleep_current = PM_SUSPEND_TO_IDLE; } acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n", bitmask); } else { acpi_handle_debug(adev->handle, "_DSM function 0 evaluation failed\n"); } ACPI_FREE(out_obj); lpi_device_get_constraints(); 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(); s2idle_in_progress = true; return 0; } static int acpi_s2idle_prepare(void) { if (lps0_device_handle) { acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF); acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY); } else { /* * The configuration of GPEs is changed here to avoid spurious * wakeups, but that should not be necessary if this is a * "low-power S0" platform and the low-power S0 _DSM is present. */ acpi_enable_all_wakeup_gpes(); acpi_os_wait_events_complete(); } if (acpi_sci_irq_valid()) enable_irq_wake(acpi_sci_irq); return 0; } static void acpi_s2idle_wake(void) { if (pm_debug_messages_on) lpi_check_constraints(); /* * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means * that the SCI has triggered while suspended, so cancel the wakeup in * case it has not been a wakeup event (the GPEs will be checked later). */ if (acpi_sci_irq_valid() && !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) { pm_system_cancel_wakeup(); s2idle_wakeup = true; } } static void acpi_s2idle_sync(void) { /* * Process all pending events in case there are any wakeup ones. * * The EC driver uses the system workqueue and an additional special * one, so those need to be flushed too. */ acpi_ec_flush_work(); acpi_os_wait_events_complete(); s2idle_wakeup = false; } static void acpi_s2idle_restore(void) { if (acpi_sci_irq_valid()) disable_irq_wake(acpi_sci_irq); if (lps0_device_handle) { acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT); acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON); } else { acpi_enable_all_runtime_gpes(); } } static void acpi_s2idle_end(void) { s2idle_in_progress = false; 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, .sync = acpi_s2idle_sync, .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_in_progress (false) #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; } bool acpi_sleep_no_ec_events(void) { return !s2idle_in_progress || !lps0_device_handle; } #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(void) { int error; error = nvs_nosave ? 0 : suspend_nvs_alloc(); if (!error) acpi_pm_start(ACPI_STATE_S4); return error; } 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(void) { 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) { if (!nvs_nosave) error = suspend_nvs_alloc(); if (!error) { acpi_target_sleep_state = ACPI_STATE_S4; acpi_scan_lock_acquire(); } } return error; } /* * 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; }