diff options
Diffstat (limited to 'drivers/acpi/device_pm.c')
| -rw-r--r-- | drivers/acpi/device_pm.c | 1250 |
1 files changed, 848 insertions, 402 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 4ab807dc8518..4e0583274b8f 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * drivers/acpi/device_pm.c - ACPI device power management routines. * @@ -6,37 +7,22 @@ * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ -#include <linux/device.h> +#define pr_fmt(fmt) "PM: " fmt + +#include <linux/acpi.h> #include <linux/export.h> #include <linux/mutex.h> #include <linux/pm_qos.h> +#include <linux/pm_domain.h> #include <linux/pm_runtime.h> +#include <linux/suspend.h> -#include <acpi/acpi.h> -#include <acpi/acpi_bus.h> -#include <acpi/acpi_drivers.h> - +#include "fan.h" #include "internal.h" -#define _COMPONENT ACPI_POWER_COMPONENT -ACPI_MODULE_NAME("device_pm"); - /** * acpi_power_state_string - String representation of ACPI device power state. * @state: ACPI device power state to return the string representation of. @@ -59,6 +45,19 @@ const char *acpi_power_state_string(int state) } } +static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state) +{ + unsigned long long psc; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc); + if (ACPI_FAILURE(status)) + return -ENODEV; + + *state = psc; + return 0; +} + /** * acpi_device_get_power - Get power state of an ACPI device. * @device: Device to get the power state of. @@ -67,18 +66,26 @@ const char *acpi_power_state_string(int state) * This function does not update the device's power.state field, but it may * update its parent's power.state field (when the parent's power state is * unknown and the device's power state turns out to be D0). + * + * Also, it does not update power resource reference counters to ensure that + * the power state returned by it will be persistent and it may return a power + * state shallower than previously set by acpi_device_set_power() for @device + * (if that power state depends on any power resources). */ int acpi_device_get_power(struct acpi_device *device, int *state) { int result = ACPI_STATE_UNKNOWN; + struct acpi_device *parent; + int error; if (!device || !state) return -EINVAL; + parent = acpi_dev_parent(device); + if (!device->flags.power_manageable) { /* TBD: Non-recursive algorithm for walking up hierarchy. */ - *state = device->parent ? - device->parent->power.state : ACPI_STATE_D0; + *state = parent ? parent->power.state : ACPI_STATE_D0; goto out; } @@ -87,48 +94,46 @@ int acpi_device_get_power(struct acpi_device *device, int *state) * if available. */ if (device->power.flags.power_resources) { - int error = acpi_power_get_inferred_state(device, &result); + error = acpi_power_get_inferred_state(device, &result); if (error) return error; } if (device->power.flags.explicit_get) { - acpi_handle handle = device->handle; - unsigned long long psc; - acpi_status status; + int psc; - status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc); - if (ACPI_FAILURE(status)) - return -ENODEV; + error = acpi_dev_pm_explicit_get(device, &psc); + if (error) + return error; /* * The power resources settings may indicate a power state - * shallower than the actual power state of the device. + * shallower than the actual power state of the device, because + * the same power resources may be referenced by other devices. * - * Moreover, on systems predating ACPI 4.0, if the device - * doesn't depend on any power resources and _PSC returns 3, - * that means "power off". We need to maintain compatibility - * with those systems. + * For systems predating ACPI 4.0 we assume that D3hot is the + * deepest state that can be supported. */ if (psc > result && psc < ACPI_STATE_D3_COLD) result = psc; else if (result == ACPI_STATE_UNKNOWN) - result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_COLD : psc; + result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc; } /* * If we were unsure about the device parent's power state up to this * point, the fact that the device is in D0 implies that the parent has - * to be in D0 too. + * to be in D0 too, except if ignore_parent is set. */ - if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN - && result == ACPI_STATE_D0) - device->parent->power.state = ACPI_STATE_D0; + if (!device->power.flags.ignore_parent && parent && + parent->power.state == ACPI_STATE_UNKNOWN && + result == ACPI_STATE_D0) + parent->power.state = ACPI_STATE_D0; *state = result; out: - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", - device->pnp.bus_id, acpi_power_state_string(*state))); + acpi_handle_debug(device->handle, "Power state: %s\n", + acpi_power_state_string(*state)); return 0; } @@ -156,102 +161,146 @@ static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state) */ int acpi_device_set_power(struct acpi_device *device, int state) { + int target_state = state; int result = 0; - bool cut_power = false; - if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) + if (!device || !device->flags.power_manageable + || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) return -EINVAL; + acpi_handle_debug(device->handle, "Power state change: %s -> %s\n", + acpi_power_state_string(device->power.state), + acpi_power_state_string(state)); + /* Make sure this is a valid target state */ - if (state == device->power.state) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n", - acpi_power_state_string(state))); - return 0; - } + /* There is a special case for D0 addressed below. */ + if (state > ACPI_STATE_D0 && state == device->power.state) + goto no_change; - if (!device->power.states[state].flags.valid) { - printk(KERN_WARNING PREFIX "Device does not support %s\n", - acpi_power_state_string(state)); - return -ENODEV; - } - if (device->parent && (state < device->parent->power.state)) { - printk(KERN_WARNING PREFIX - "Cannot set device to a higher-powered" - " state than parent\n"); + if (state == ACPI_STATE_D3_COLD) { + /* + * For transitions to D3cold we need to execute _PS3 and then + * possibly drop references to the power resources in use. + */ + state = ACPI_STATE_D3_HOT; + /* If D3cold is not supported, use D3hot as the target state. */ + if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid) + target_state = state; + } else if (!device->power.states[state].flags.valid) { + acpi_handle_debug(device->handle, "Power state %s not supported\n", + acpi_power_state_string(state)); return -ENODEV; } - /* For D3cold we should first transition into D3hot. */ - if (state == ACPI_STATE_D3_COLD - && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) { - state = ACPI_STATE_D3_HOT; - cut_power = true; - } + if (!device->power.flags.ignore_parent) { + struct acpi_device *parent; - if (state < device->power.state && state != ACPI_STATE_D0 - && device->power.state >= ACPI_STATE_D3_HOT) { - printk(KERN_WARNING PREFIX - "Cannot transition to non-D0 state from D3\n"); - return -ENODEV; + parent = acpi_dev_parent(device); + if (parent && state < parent->power.state) { + acpi_handle_debug(device->handle, + "Cannot transition to %s for parent in %s\n", + acpi_power_state_string(state), + acpi_power_state_string(parent->power.state)); + return -ENODEV; + } } /* * Transition Power * ---------------- - * In accordance with the ACPI specification first apply power (via - * power resources) and then evalute _PSx. + * In accordance with ACPI 6, _PSx is executed before manipulating power + * resources, unless the target state is D0, in which case _PS0 is + * supposed to be executed after turning the power resources on. */ - if (device->power.flags.power_resources) { - result = acpi_power_transition(device, state); - if (result) - goto end; - } - result = acpi_dev_pm_explicit_set(device, state); - if (result) - goto end; + if (state > ACPI_STATE_D0) { + /* + * According to ACPI 6, devices cannot go from lower-power + * (deeper) states to higher-power (shallower) states. + */ + if (state < device->power.state) { + acpi_handle_debug(device->handle, + "Cannot transition from %s to %s\n", + acpi_power_state_string(device->power.state), + acpi_power_state_string(state)); + return -ENODEV; + } - if (cut_power) { - device->power.state = state; - state = ACPI_STATE_D3_COLD; - result = acpi_power_transition(device, state); + /* + * If the device goes from D3hot to D3cold, _PS3 has been + * evaluated for it already, so skip it in that case. + */ + if (device->power.state < ACPI_STATE_D3_HOT) { + result = acpi_dev_pm_explicit_set(device, state); + if (result) + goto end; + } + + if (device->power.flags.power_resources) + result = acpi_power_transition(device, target_state); + } else { + int cur_state = device->power.state; + + if (device->power.flags.power_resources) { + result = acpi_power_transition(device, ACPI_STATE_D0); + if (result) + goto end; + } + + if (cur_state == ACPI_STATE_D0) { + int psc; + + /* Nothing to do here if _PSC is not present. */ + if (!device->power.flags.explicit_get) + goto no_change; + + /* + * The power state of the device was set to D0 last + * time, but that might have happened before a + * system-wide transition involving the platform + * firmware, so it may be necessary to evaluate _PS0 + * for the device here. However, use extra care here + * and evaluate _PSC to check the device's current power + * state, and only invoke _PS0 if the evaluation of _PSC + * is successful and it returns a power state different + * from D0. + */ + result = acpi_dev_pm_explicit_get(device, &psc); + if (result || psc == ACPI_STATE_D0) + goto no_change; + } + + result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0); } - end: +end: if (result) { - printk(KERN_WARNING PREFIX - "Device [%s] failed to transition to %s\n", - device->pnp.bus_id, - acpi_power_state_string(state)); + acpi_handle_debug(device->handle, + "Failed to change power state to %s\n", + acpi_power_state_string(target_state)); } else { - device->power.state = state; - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Device [%s] transitioned to %s\n", - device->pnp.bus_id, - acpi_power_state_string(state))); + device->power.state = target_state; + acpi_handle_debug(device->handle, "Power state changed to %s\n", + acpi_power_state_string(target_state)); } return result; + +no_change: + acpi_handle_debug(device->handle, "Already in %s\n", + acpi_power_state_string(state)); + return 0; } EXPORT_SYMBOL(acpi_device_set_power); int acpi_bus_set_power(acpi_handle handle, int state) { - struct acpi_device *device; - int result; + struct acpi_device *device = acpi_fetch_acpi_dev(handle); - result = acpi_bus_get_device(handle, &device); - if (result) - return result; - - if (!device->flags.power_manageable) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Device [%s] is not power manageable\n", - dev_name(&device->dev))); - return -ENODEV; - } + if (device) + return acpi_device_set_power(device, state); - return acpi_device_set_power(device, state); + return -ENODEV; } EXPORT_SYMBOL(acpi_bus_set_power); @@ -264,19 +313,34 @@ int acpi_bus_init_power(struct acpi_device *device) return -EINVAL; device->power.state = ACPI_STATE_UNKNOWN; + if (!acpi_device_is_present(device)) { + device->flags.initialized = false; + return -ENXIO; + } result = acpi_device_get_power(device, &state); if (result) return result; if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) { + /* Reference count the power resources. */ result = acpi_power_on_resources(device, state); if (result) return result; - result = acpi_dev_pm_explicit_set(device, state); - if (result) - return result; + if (state == ACPI_STATE_D0) { + /* + * If _PSC is not present and the state inferred from + * power resources appears to be D0, it still may be + * necessary to execute _PS0 at this point, because + * another device using the same power resources may + * have been put into D0 previously and that's why we + * see D0 here. + */ + result = acpi_dev_pm_explicit_set(device, state); + if (result) + return result; + } } else if (state == ACPI_STATE_UNKNOWN) { /* * No power resources and missing _PSC? Cross fingers and make @@ -309,16 +373,55 @@ int acpi_device_fix_up_power(struct acpi_device *device) return ret; } +EXPORT_SYMBOL_GPL(acpi_device_fix_up_power); -int acpi_bus_update_power(acpi_handle handle, int *state_p) +static int fix_up_power_if_applicable(struct acpi_device *adev, void *not_used) +{ + if (adev->status.present && adev->status.enabled) + acpi_device_fix_up_power(adev); + + return 0; +} + +/** + * acpi_device_fix_up_power_extended - Force device and its children into D0. + * @adev: Parent device object whose power state is to be fixed up. + * + * Call acpi_device_fix_up_power() for @adev and its children so long as they + * are reported as present and enabled. + */ +void acpi_device_fix_up_power_extended(struct acpi_device *adev) +{ + acpi_device_fix_up_power(adev); + acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL); +} +EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_extended); + +/** + * acpi_device_fix_up_power_children - Force a device's children into D0. + * @adev: Parent device object whose children's power state is to be fixed up. + * + * Call acpi_device_fix_up_power() for @adev's children so long as they + * are reported as present and enabled. + */ +void acpi_device_fix_up_power_children(struct acpi_device *adev) +{ + acpi_dev_for_each_child(adev, fix_up_power_if_applicable, NULL); +} +EXPORT_SYMBOL_GPL(acpi_device_fix_up_power_children); + +int acpi_device_update_power(struct acpi_device *device, int *state_p) { - struct acpi_device *device; int state; int result; - result = acpi_bus_get_device(handle, &device); - if (result) + if (device->power.state == ACPI_STATE_UNKNOWN) { + result = acpi_bus_init_power(device); + if (!result && state_p) + *state_p = device->power.state; + return result; + } result = acpi_device_get_power(device, &state); if (result) @@ -346,51 +449,152 @@ int acpi_bus_update_power(acpi_handle handle, int *state_p) return 0; } +EXPORT_SYMBOL_GPL(acpi_device_update_power); + +int acpi_bus_update_power(acpi_handle handle, int *state_p) +{ + struct acpi_device *device = acpi_fetch_acpi_dev(handle); + + if (device) + return acpi_device_update_power(device, state_p); + + return -ENODEV; +} EXPORT_SYMBOL_GPL(acpi_bus_update_power); bool acpi_bus_power_manageable(acpi_handle handle) { - struct acpi_device *device; - int result; + struct acpi_device *device = acpi_fetch_acpi_dev(handle); - result = acpi_bus_get_device(handle, &device); - return result ? false : device->flags.power_manageable; + return device && device->flags.power_manageable; } EXPORT_SYMBOL(acpi_bus_power_manageable); +static int acpi_power_up_if_adr_present(struct acpi_device *adev, void *not_used) +{ + if (!(adev->flags.power_manageable && adev->pnp.type.bus_address)) + return 0; + + acpi_handle_debug(adev->handle, "Power state: %s\n", + acpi_power_state_string(adev->power.state)); + + if (adev->power.state == ACPI_STATE_D3_COLD) + return acpi_device_set_power(adev, ACPI_STATE_D0); + + return 0; +} + +/** + * acpi_dev_power_up_children_with_adr - Power up childres with valid _ADR + * @adev: Parent ACPI device object. + * + * Change the power states of the direct children of @adev that are in D3cold + * and hold valid _ADR objects to D0 in order to allow bus (e.g. PCI) + * enumeration code to access them. + */ +void acpi_dev_power_up_children_with_adr(struct acpi_device *adev) +{ + acpi_dev_for_each_child(adev, acpi_power_up_if_adr_present, NULL); +} + +/** + * acpi_dev_power_state_for_wake - Deepest power state for wakeup signaling + * @adev: ACPI companion of the target device. + * + * Evaluate _S0W for @adev and return the value produced by it or return + * ACPI_STATE_UNKNOWN on errors (including _S0W not present). + */ +u8 acpi_dev_power_state_for_wake(struct acpi_device *adev) +{ + unsigned long long state; + acpi_status status; + + status = acpi_evaluate_integer(adev->handle, "_S0W", NULL, &state); + if (ACPI_FAILURE(status)) + return ACPI_STATE_UNKNOWN; + + return state; +} + #ifdef CONFIG_PM static DEFINE_MUTEX(acpi_pm_notifier_lock); +static DEFINE_MUTEX(acpi_pm_notifier_install_lock); + +void acpi_pm_wakeup_event(struct device *dev) +{ + pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup()); +} +EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event); + +static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used) +{ + struct acpi_device *adev; + + if (val != ACPI_NOTIFY_DEVICE_WAKE) + return; + + acpi_handle_debug(handle, "Wake notify\n"); + + adev = acpi_get_acpi_dev(handle); + if (!adev) + return; + + mutex_lock(&acpi_pm_notifier_lock); + + if (adev->wakeup.flags.notifier_present) { + pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup()); + if (adev->wakeup.context.func) { + acpi_handle_debug(handle, "Running %pS for %s\n", + adev->wakeup.context.func, + dev_name(adev->wakeup.context.dev)); + adev->wakeup.context.func(&adev->wakeup.context); + } + } + + mutex_unlock(&acpi_pm_notifier_lock); + + acpi_put_acpi_dev(adev); +} /** - * acpi_add_pm_notifier - Register PM notifier for given ACPI device. - * @adev: ACPI device to add the notifier for. - * @context: Context information to pass to the notifier routine. + * acpi_add_pm_notifier - Register PM notify handler for given ACPI device. + * @adev: ACPI device to add the notify handler for. + * @dev: Device to generate a wakeup event for while handling the notification. + * @func: Work function to execute when handling the notification. * * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of * PM wakeup events. For example, wakeup events may be generated for bridges * if one of the devices below the bridge is signaling wakeup, even if the * bridge itself doesn't have a wakeup GPE associated with it. */ -acpi_status acpi_add_pm_notifier(struct acpi_device *adev, - acpi_notify_handler handler, void *context) +acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev, + void (*func)(struct acpi_device_wakeup_context *context)) { acpi_status status = AE_ALREADY_EXISTS; - mutex_lock(&acpi_pm_notifier_lock); + if (!dev && !func) + return AE_BAD_PARAMETER; + + mutex_lock(&acpi_pm_notifier_install_lock); if (adev->wakeup.flags.notifier_present) goto out; - status = acpi_install_notify_handler(adev->handle, - ACPI_SYSTEM_NOTIFY, - handler, context); + status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, + acpi_pm_notify_handler, NULL); if (ACPI_FAILURE(status)) goto out; + mutex_lock(&acpi_pm_notifier_lock); + adev->wakeup.ws = wakeup_source_register(&adev->dev, + dev_name(&adev->dev)); + adev->wakeup.context.dev = dev; + adev->wakeup.context.func = func; adev->wakeup.flags.notifier_present = true; + mutex_unlock(&acpi_pm_notifier_lock); out: - mutex_unlock(&acpi_pm_notifier_lock); + mutex_unlock(&acpi_pm_notifier_install_lock); return status; } @@ -398,39 +602,48 @@ acpi_status acpi_add_pm_notifier(struct acpi_device *adev, * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device. * @adev: ACPI device to remove the notifier from. */ -acpi_status acpi_remove_pm_notifier(struct acpi_device *adev, - acpi_notify_handler handler) +acpi_status acpi_remove_pm_notifier(struct acpi_device *adev) { acpi_status status = AE_BAD_PARAMETER; - mutex_lock(&acpi_pm_notifier_lock); + mutex_lock(&acpi_pm_notifier_install_lock); if (!adev->wakeup.flags.notifier_present) goto out; status = acpi_remove_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY, - handler); + acpi_pm_notify_handler); if (ACPI_FAILURE(status)) goto out; + mutex_lock(&acpi_pm_notifier_lock); + adev->wakeup.context.func = NULL; + adev->wakeup.context.dev = NULL; + wakeup_source_unregister(adev->wakeup.ws); adev->wakeup.flags.notifier_present = false; + mutex_unlock(&acpi_pm_notifier_lock); out: - mutex_unlock(&acpi_pm_notifier_lock); + mutex_unlock(&acpi_pm_notifier_install_lock); return status; } bool acpi_bus_can_wakeup(acpi_handle handle) { - struct acpi_device *device; - int result; + struct acpi_device *device = acpi_fetch_acpi_dev(handle); - result = acpi_bus_get_device(handle, &device); - return result ? false : device->wakeup.flags.valid; + return device && device->wakeup.flags.valid; } EXPORT_SYMBOL(acpi_bus_can_wakeup); +bool acpi_pm_device_can_wakeup(struct device *dev) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + + return adev ? acpi_device_can_wakeup(adev) : false; +} + /** * acpi_dev_pm_get_state - Get preferred power state of ACPI device. * @dev: Device whose preferred target power state to return. @@ -460,6 +673,7 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, unsigned long long ret; int d_min, d_max; bool wakeup = false; + bool has_sxd = false; acpi_status status; /* @@ -498,11 +712,29 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, else return -ENODATA; } + + if (status == AE_OK) + has_sxd = true; + d_min = ret; wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid && adev->wakeup.sleep_state >= target_state; - } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) != - PM_QOS_FLAGS_NONE) { + } else if (device_may_wakeup(dev) && dev->power.wakeirq) { + /* + * The ACPI subsystem doesn't manage the wake bit for IRQs + * defined with ExclusiveAndWake and SharedAndWake. Instead we + * expect them to be managed via the PM subsystem. Drivers + * should call dev_pm_set_wake_irq to register an IRQ as a wake + * source. + * + * If a device has a wake IRQ attached we need to check the + * _S0W method to get the correct wake D-state. Otherwise we + * end up putting the device into D3Cold which will more than + * likely disable wake functionality. + */ + wakeup = true; + } else { + /* ACPI GPE is specified in _PRW. */ wakeup = adev->wakeup.flags.valid; } @@ -517,7 +749,11 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, method[3] = 'W'; status = acpi_evaluate_integer(handle, method, NULL, &ret); if (status == AE_NOT_FOUND) { - if (target_state > ACPI_STATE_S0) + /* No _SxW. In this case, the ACPI spec says that we + * must not go into any power state deeper than the + * value returned from _SxD. + */ + if (has_sxd && target_state > ACPI_STATE_S0) d_max = d_min; } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) { /* Fall back to D3cold if ret is not a valid state. */ @@ -552,23 +788,23 @@ static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev, */ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) { - acpi_handle handle = DEVICE_ACPI_HANDLE(dev); struct acpi_device *adev; int ret, d_min, d_max; if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD) return -EINVAL; - if (d_max_in > ACPI_STATE_D3_HOT) { + if (d_max_in > ACPI_STATE_D2) { enum pm_qos_flags_status stat; stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF); if (stat == PM_QOS_FLAGS_ALL) - d_max_in = ACPI_STATE_D3_HOT; + d_max_in = ACPI_STATE_D2; } - if (!handle || acpi_bus_get_device(handle, &adev)) { - dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); + adev = ACPI_COMPANION(dev); + if (!adev) { + dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); return -ENODEV; } @@ -594,143 +830,149 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in) } EXPORT_SYMBOL(acpi_pm_device_sleep_state); -#ifdef CONFIG_PM_RUNTIME /** - * acpi_wakeup_device - Wakeup notification handler for ACPI devices. - * @handle: ACPI handle of the device the notification is for. - * @event: Type of the signaled event. - * @context: Device corresponding to @handle. + * acpi_pm_notify_work_func - ACPI devices wakeup notification work function. + * @context: Device wakeup context. */ -static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context) +static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context) { - struct device *dev = context; + struct device *dev = context->dev; - if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) { + if (dev) { pm_wakeup_event(dev, 0); - pm_runtime_resume(dev); + pm_request_resume(dev); } } -/** - * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device. - * @adev: ACPI device to enable/disable the remote wakeup for. - * @enable: Whether to enable or disable the wakeup functionality. - * - * Enable/disable the GPE associated with @adev so that it can generate - * wakeup signals for the device in response to external (remote) events and - * enable/disable device wakeup power. - * - * Callers must ensure that @adev is a valid ACPI device node before executing - * this function. - */ -int __acpi_device_run_wake(struct acpi_device *adev, bool enable) +static DEFINE_MUTEX(acpi_wakeup_lock); + +static int __acpi_device_wakeup_enable(struct acpi_device *adev, + u32 target_state) { struct acpi_device_wakeup *wakeup = &adev->wakeup; + acpi_status status; + int error = 0; - if (enable) { - acpi_status res; - int error; + mutex_lock(&acpi_wakeup_lock); - error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0); - if (error) - return error; + /* + * If the device wakeup power is already enabled, disable it and enable + * it again in case it depends on the configuration of subordinate + * devices and the conditions have changed since it was enabled last + * time. + */ + if (wakeup->enable_count > 0) + acpi_disable_wakeup_device_power(adev); - res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); - if (ACPI_FAILURE(res)) { - acpi_disable_wakeup_device_power(adev); - return -EIO; + error = acpi_enable_wakeup_device_power(adev, target_state); + if (error) { + if (wakeup->enable_count > 0) { + acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); + wakeup->enable_count = 0; } - } else { - acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); + goto out; + } + + if (wakeup->enable_count > 0) + goto inc; + + status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number); + if (ACPI_FAILURE(status)) { acpi_disable_wakeup_device_power(adev); + error = -EIO; + goto out; } - return 0; + + acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n", + (unsigned int)wakeup->gpe_number); + +inc: + if (wakeup->enable_count < INT_MAX) + wakeup->enable_count++; + else + acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n"); + +out: + mutex_unlock(&acpi_wakeup_lock); + return error; } /** - * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device. - * @dev: Device to enable/disable the platform to wake up. - * @enable: Whether to enable or disable the wakeup functionality. + * acpi_device_wakeup_enable - Enable wakeup functionality for device. + * @adev: ACPI device to enable wakeup functionality for. + * @target_state: State the system is transitioning into. + * + * Enable the GPE associated with @adev so that it can generate wakeup signals + * for the device in response to external (remote) events and enable wakeup + * power for it. + * + * Callers must ensure that @adev is a valid ACPI device node before executing + * this function. */ -int acpi_pm_device_run_wake(struct device *phys_dev, bool enable) +static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state) { - struct acpi_device *adev; - acpi_handle handle; - - if (!device_run_wake(phys_dev)) - return -EINVAL; - - handle = DEVICE_ACPI_HANDLE(phys_dev); - if (!handle || acpi_bus_get_device(handle, &adev)) { - dev_dbg(phys_dev, "ACPI handle without context in %s!\n", - __func__); - return -ENODEV; - } - - return __acpi_device_run_wake(adev, enable); + return __acpi_device_wakeup_enable(adev, target_state); } -EXPORT_SYMBOL(acpi_pm_device_run_wake); -#else -static inline void acpi_wakeup_device(acpi_handle handle, u32 event, - void *context) {} -#endif /* CONFIG_PM_RUNTIME */ -#ifdef CONFIG_PM_SLEEP /** - * __acpi_device_sleep_wake - Enable or disable device to wake up the system. - * @dev: Device to enable/desible to wake up the system. - * @target_state: System state the device is supposed to wake up from. - * @enable: Whether to enable or disable @dev to wake up the system. + * acpi_device_wakeup_disable - Disable wakeup functionality for device. + * @adev: ACPI device to disable wakeup functionality for. + * + * Disable the GPE associated with @adev and disable wakeup power for it. + * + * Callers must ensure that @adev is a valid ACPI device node before executing + * this function. */ -int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state, - bool enable) +static void acpi_device_wakeup_disable(struct acpi_device *adev) { - return enable ? - acpi_enable_wakeup_device_power(adev, target_state) : - acpi_disable_wakeup_device_power(adev); + struct acpi_device_wakeup *wakeup = &adev->wakeup; + + mutex_lock(&acpi_wakeup_lock); + + if (!wakeup->enable_count) + goto out; + + acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number); + acpi_disable_wakeup_device_power(adev); + + wakeup->enable_count--; + +out: + mutex_unlock(&acpi_wakeup_lock); } /** - * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system. - * @dev: Device to enable/desible to wake up the system from sleep states. - * @enable: Whether to enable or disable @dev to wake up the system. + * acpi_pm_set_device_wakeup - Enable/disable remote wakeup for given device. + * @dev: Device to enable/disable to generate wakeup events. + * @enable: Whether to enable or disable the wakeup functionality. */ -int acpi_pm_device_sleep_wake(struct device *dev, bool enable) +int acpi_pm_set_device_wakeup(struct device *dev, bool enable) { - acpi_handle handle; struct acpi_device *adev; int error; - if (!device_can_wakeup(dev)) + adev = ACPI_COMPANION(dev); + if (!adev) { + dev_dbg(dev, "ACPI companion missing in %s!\n", __func__); + return -ENODEV; + } + + if (!acpi_device_can_wakeup(adev)) return -EINVAL; - handle = DEVICE_ACPI_HANDLE(dev); - if (!handle || acpi_bus_get_device(handle, &adev)) { - dev_dbg(dev, "ACPI handle without context in %s!\n", __func__); - return -ENODEV; + if (!enable) { + acpi_device_wakeup_disable(adev); + dev_dbg(dev, "Wakeup disabled by ACPI\n"); + return 0; } - error = __acpi_device_sleep_wake(adev, acpi_target_system_state(), - enable); + error = __acpi_device_wakeup_enable(adev, acpi_target_system_state()); if (!error) - dev_info(dev, "System wakeup %s by ACPI\n", - enable ? "enabled" : "disabled"); + dev_dbg(dev, "Wakeup enabled by ACPI\n"); return error; } -#endif /* CONFIG_PM_SLEEP */ - -/** - * acpi_dev_pm_get_node - Get ACPI device node for the given physical device. - * @dev: Device to get the ACPI node for. - */ -struct acpi_device *acpi_dev_pm_get_node(struct device *dev) -{ - acpi_handle handle = DEVICE_ACPI_HANDLE(dev); - struct acpi_device *adev; - - return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL; -} +EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup); /** * acpi_dev_pm_low_power - Put ACPI device into a low-power state. @@ -760,60 +1002,61 @@ static int acpi_dev_pm_full_power(struct acpi_device *adev) acpi_device_set_power(adev, ACPI_STATE_D0) : 0; } -#ifdef CONFIG_PM_RUNTIME /** - * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI. + * acpi_dev_suspend - Put device into a low-power state using ACPI. * @dev: Device to put into a low-power state. + * @wakeup: Whether or not to enable wakeup for the device. * - * Put the given device into a runtime low-power state using the standard ACPI + * Put the given device into a low-power state using the standard ACPI * mechanism. Set up remote wakeup if desired, choose the state to put the * device into (this checks if remote wakeup is expected to work too), and set * the power state of the device. */ -int acpi_dev_runtime_suspend(struct device *dev) +int acpi_dev_suspend(struct device *dev, bool wakeup) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); - bool remote_wakeup; + struct acpi_device *adev = ACPI_COMPANION(dev); + u32 target_state = acpi_target_system_state(); int error; if (!adev) return 0; - remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) > - PM_QOS_FLAGS_NONE; - error = __acpi_device_run_wake(adev, remote_wakeup); - if (remote_wakeup && error) - return -EAGAIN; + if (wakeup && acpi_device_can_wakeup(adev)) { + error = acpi_device_wakeup_enable(adev, target_state); + if (error) + return -EAGAIN; + } else { + wakeup = false; + } - error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); - if (error) - __acpi_device_run_wake(adev, false); + error = acpi_dev_pm_low_power(dev, adev, target_state); + if (error && wakeup) + acpi_device_wakeup_disable(adev); return error; } -EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend); +EXPORT_SYMBOL_GPL(acpi_dev_suspend); /** - * acpi_dev_runtime_resume - Put device into the full-power state using ACPI. + * acpi_dev_resume - Put device into the full-power state using ACPI. * @dev: Device to put into the full-power state. * * Put the given device into the full-power state using the standard ACPI - * mechanism at run time. Set the power state of the device to ACPI D0 and - * disable remote wakeup. + * mechanism. Set the power state of the device to ACPI D0 and disable wakeup. */ -int acpi_dev_runtime_resume(struct device *dev) +int acpi_dev_resume(struct device *dev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); int error; if (!adev) return 0; error = acpi_dev_pm_full_power(adev); - __acpi_device_run_wake(adev, false); + acpi_device_wakeup_disable(adev); return error; } -EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); +EXPORT_SYMBOL_GPL(acpi_dev_resume); /** * acpi_subsys_runtime_suspend - Suspend device using ACPI. @@ -825,7 +1068,8 @@ EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume); int acpi_subsys_runtime_suspend(struct device *dev) { int ret = pm_generic_runtime_suspend(dev); - return ret ? ret : acpi_dev_runtime_suspend(dev); + + return ret ? ret : acpi_dev_suspend(dev, true); } EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); @@ -838,82 +1082,96 @@ EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend); */ int acpi_subsys_runtime_resume(struct device *dev) { - int ret = acpi_dev_runtime_resume(dev); + int ret = acpi_dev_resume(dev); + return ret ? ret : pm_generic_runtime_resume(dev); } EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume); -#endif /* CONFIG_PM_RUNTIME */ #ifdef CONFIG_PM_SLEEP -/** - * acpi_dev_suspend_late - Put device into a low-power state using ACPI. - * @dev: Device to put into a low-power state. - * - * Put the given device into a low-power state during system transition to a - * sleep state using the standard ACPI mechanism. Set up system wakeup if - * desired, choose the state to put the device into (this checks if system - * wakeup is expected to work too), and set the power state of the device. - */ -int acpi_dev_suspend_late(struct device *dev) +static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); - u32 target_state; - bool wakeup; - int error; + u32 sys_target = acpi_target_system_state(); + int ret, state; - if (!adev) - return 0; + if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid && + device_may_wakeup(dev) != !!adev->wakeup.prepare_count)) + return true; - target_state = acpi_target_system_state(); - wakeup = device_may_wakeup(dev); - error = __acpi_device_sleep_wake(adev, target_state, wakeup); - if (wakeup && error) - return error; + if (sys_target == ACPI_STATE_S0) + return false; - error = acpi_dev_pm_low_power(dev, adev, target_state); - if (error) - __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false); + if (adev->power.flags.dsw_present) + return true; - return error; + ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state); + if (ret) + return true; + + return state != adev->power.state; } -EXPORT_SYMBOL_GPL(acpi_dev_suspend_late); /** - * acpi_dev_resume_early - Put device into the full-power state using ACPI. - * @dev: Device to put into the full-power state. - * - * Put the given device into the full-power state using the standard ACPI - * mechanism during system transition to the working state. Set the power - * state of the device to ACPI D0 and disable remote wakeup. + * acpi_subsys_prepare - Prepare device for system transition to a sleep state. + * @dev: Device to prepare. */ -int acpi_dev_resume_early(struct device *dev) +int acpi_subsys_prepare(struct device *dev) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); - int error; + struct acpi_device *adev = ACPI_COMPANION(dev); - if (!adev) - return 0; + dev_pm_set_strict_midlayer(dev, true); - error = acpi_dev_pm_full_power(adev); - __acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false); - return error; + if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) { + int ret = dev->driver->pm->prepare(dev); + + if (ret < 0) + return ret; + + if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) + return 0; + } + + return !acpi_dev_needs_resume(dev, adev); } -EXPORT_SYMBOL_GPL(acpi_dev_resume_early); +EXPORT_SYMBOL_GPL(acpi_subsys_prepare); /** - * acpi_subsys_prepare - Prepare device for system transition to a sleep state. - * @dev: Device to prepare. + * acpi_subsys_complete - Finalize device's resume during system resume. + * @dev: Device to handle. */ -int acpi_subsys_prepare(struct device *dev) +void acpi_subsys_complete(struct device *dev) { + pm_generic_complete(dev); /* - * Follow PCI and resume devices suspended at run time before running - * their system suspend callbacks. + * If the device had been runtime-suspended before the system went into + * the sleep state it is going out of and it has never been resumed till + * now, resume it in case the firmware powered it up. */ - pm_runtime_resume(dev); - return pm_generic_prepare(dev); + if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) + pm_request_resume(dev); + + dev_pm_set_strict_midlayer(dev, false); } -EXPORT_SYMBOL_GPL(acpi_subsys_prepare); +EXPORT_SYMBOL_GPL(acpi_subsys_complete); + +/** + * acpi_subsys_suspend - Run the device driver's suspend callback. + * @dev: Device to handle. + * + * Follow PCI and resume devices from runtime suspend before running their + * system suspend callbacks, unless the driver can cope with runtime-suspended + * devices during system suspend and there are no ACPI-specific reasons for + * resuming them. + */ +int acpi_subsys_suspend(struct device *dev) +{ + if (!dev_pm_smart_suspend(dev) || + acpi_dev_needs_resume(dev, ACPI_COMPANION(dev))) + pm_runtime_resume(dev); + + return pm_generic_suspend(dev); +} +EXPORT_SYMBOL_GPL(acpi_subsys_suspend); /** * acpi_subsys_suspend_late - Suspend device using ACPI. @@ -924,80 +1182,216 @@ EXPORT_SYMBOL_GPL(acpi_subsys_prepare); */ int acpi_subsys_suspend_late(struct device *dev) { - int ret = pm_generic_suspend_late(dev); - return ret ? ret : acpi_dev_suspend_late(dev); + int ret; + + if (dev_pm_skip_suspend(dev)) + return 0; + + ret = pm_generic_suspend_late(dev); + return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev)); } EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late); /** + * acpi_subsys_suspend_noirq - Run the device driver's "noirq" suspend callback. + * @dev: Device to suspend. + */ +int acpi_subsys_suspend_noirq(struct device *dev) +{ + int ret; + + if (dev_pm_skip_suspend(dev)) + return 0; + + ret = pm_generic_suspend_noirq(dev); + if (ret) + return ret; + + /* + * If the target system sleep state is suspend-to-idle, it is sufficient + * to check whether or not the device's wakeup settings are good for + * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause + * acpi_subsys_complete() to take care of fixing up the device's state + * anyway, if need be. + */ + if (device_can_wakeup(dev) && !device_may_wakeup(dev)) + dev->power.may_skip_resume = false; + + return 0; +} +EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq); + +/** + * acpi_subsys_resume_noirq - Run the device driver's "noirq" resume callback. + * @dev: Device to handle. + */ +static int acpi_subsys_resume_noirq(struct device *dev) +{ + if (dev_pm_skip_resume(dev)) + return 0; + + return pm_generic_resume_noirq(dev); +} + +/** * acpi_subsys_resume_early - Resume device using ACPI. * @dev: Device to Resume. * * Use ACPI to put the given device into the full-power state and carry out the * generic early resume procedure for it during system transition into the - * working state. + * working state, but only do that if device either defines early resume + * handler, or does not define power operations at all. Otherwise powering up + * of the device is postponed to the normal resume phase. */ -int acpi_subsys_resume_early(struct device *dev) +static int acpi_subsys_resume_early(struct device *dev) { - int ret = acpi_dev_resume_early(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + int ret; + + if (dev_pm_skip_resume(dev)) + return 0; + + if (pm && !pm->resume_early) { + dev_dbg(dev, "postponing D0 transition to normal resume stage\n"); + return 0; + } + + ret = acpi_dev_resume(dev); return ret ? ret : pm_generic_resume_early(dev); } -EXPORT_SYMBOL_GPL(acpi_subsys_resume_early); + +/** + * acpi_subsys_resume - Resume device using ACPI. + * @dev: Device to Resume. + * + * Use ACPI to put the given device into the full-power state if it has not been + * powered up during early resume phase, and carry out the generic resume + * procedure for it during system transition into the working state. + */ +static int acpi_subsys_resume(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + int ret = 0; + + if (!dev_pm_skip_resume(dev) && pm && !pm->resume_early) { + dev_dbg(dev, "executing postponed D0 transition\n"); + ret = acpi_dev_resume(dev); + } + + return ret ? ret : pm_generic_resume(dev); +} + +/** + * acpi_subsys_freeze - Run the device driver's freeze callback. + * @dev: Device to handle. + */ +int acpi_subsys_freeze(struct device *dev) +{ + /* + * Resume all runtime-suspended devices before creating a snapshot + * image of system memory, because the restore kernel generally cannot + * be expected to always handle them consistently and they need to be + * put into the runtime-active metastate during system resume anyway, + * so it is better to ensure that the state saved in the image will be + * always consistent with that. + */ + pm_runtime_resume(dev); + + return pm_generic_freeze(dev); +} +EXPORT_SYMBOL_GPL(acpi_subsys_freeze); + +/** + * acpi_subsys_restore_early - Restore device using ACPI. + * @dev: Device to restore. + */ +int acpi_subsys_restore_early(struct device *dev) +{ + int ret = acpi_dev_resume(dev); + + return ret ? ret : pm_generic_restore_early(dev); +} +EXPORT_SYMBOL_GPL(acpi_subsys_restore_early); + +/** + * acpi_subsys_poweroff - Run the device driver's poweroff callback. + * @dev: Device to handle. + * + * Follow PCI and resume devices from runtime suspend before running their + * system poweroff callbacks, unless the driver can cope with runtime-suspended + * devices during system suspend and there are no ACPI-specific reasons for + * resuming them. + */ +int acpi_subsys_poweroff(struct device *dev) +{ + if (!dev_pm_smart_suspend(dev) || + acpi_dev_needs_resume(dev, ACPI_COMPANION(dev))) + pm_runtime_resume(dev); + + return pm_generic_poweroff(dev); +} +EXPORT_SYMBOL_GPL(acpi_subsys_poweroff); + +/** + * acpi_subsys_poweroff_late - Run the device driver's poweroff callback. + * @dev: Device to handle. + * + * Carry out the generic late poweroff procedure for @dev and use ACPI to put + * it into a low-power state during system transition into a sleep state. + */ +static int acpi_subsys_poweroff_late(struct device *dev) +{ + int ret; + + if (dev_pm_skip_suspend(dev)) + return 0; + + ret = pm_generic_poweroff_late(dev); + if (ret) + return ret; + + return acpi_dev_suspend(dev, device_may_wakeup(dev)); +} + +/** + * acpi_subsys_poweroff_noirq - Run the driver's "noirq" poweroff callback. + * @dev: Device to suspend. + */ +static int acpi_subsys_poweroff_noirq(struct device *dev) +{ + if (dev_pm_skip_suspend(dev)) + return 0; + + return pm_generic_poweroff_noirq(dev); +} #endif /* CONFIG_PM_SLEEP */ +static void acpi_dev_pm_detach(struct device *dev, bool power_off); + static struct dev_pm_domain acpi_general_pm_domain = { .ops = { -#ifdef CONFIG_PM_RUNTIME .runtime_suspend = acpi_subsys_runtime_suspend, .runtime_resume = acpi_subsys_runtime_resume, -#endif #ifdef CONFIG_PM_SLEEP .prepare = acpi_subsys_prepare, + .complete = acpi_subsys_complete, + .suspend = acpi_subsys_suspend, + .resume = acpi_subsys_resume, .suspend_late = acpi_subsys_suspend_late, + .suspend_noirq = acpi_subsys_suspend_noirq, + .resume_noirq = acpi_subsys_resume_noirq, .resume_early = acpi_subsys_resume_early, - .poweroff_late = acpi_subsys_suspend_late, - .restore_early = acpi_subsys_resume_early, + .freeze = acpi_subsys_freeze, + .poweroff = acpi_subsys_poweroff, + .poweroff_late = acpi_subsys_poweroff_late, + .poweroff_noirq = acpi_subsys_poweroff_noirq, + .restore_early = acpi_subsys_restore_early, #endif }, + .detach = acpi_dev_pm_detach, }; /** - * acpi_dev_pm_attach - Prepare device for ACPI power management. - * @dev: Device to prepare. - * @power_on: Whether or not to power on the device. - * - * If @dev has a valid ACPI handle that has a valid struct acpi_device object - * attached to it, install a wakeup notification handler for the device and - * add it to the general ACPI PM domain. If @power_on is set, the device will - * be put into the ACPI D0 state before the function returns. - * - * This assumes that the @dev's bus type uses generic power management callbacks - * (or doesn't use any power management callbacks at all). - * - * Callers must ensure proper synchronization of this function with power - * management callbacks. - */ -int acpi_dev_pm_attach(struct device *dev, bool power_on) -{ - struct acpi_device *adev = acpi_dev_pm_get_node(dev); - - if (!adev) - return -ENODEV; - - if (dev->pm_domain) - return -EEXIST; - - acpi_add_pm_notifier(adev, acpi_wakeup_device, dev); - dev->pm_domain = &acpi_general_pm_domain; - if (power_on) { - acpi_dev_pm_full_power(adev); - __acpi_device_run_wake(adev, false); - } - return 0; -} -EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); - -/** * acpi_dev_pm_detach - Remove ACPI power management from the device. * @dev: Device to take care of. * @power_off: Whether or not to try to remove power from the device. @@ -1009,13 +1403,13 @@ EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); * Callers must ensure proper synchronization of this function with power * management callbacks. */ -void acpi_dev_pm_detach(struct device *dev, bool power_off) +static void acpi_dev_pm_detach(struct device *dev, bool power_off) { - struct acpi_device *adev = acpi_dev_pm_get_node(dev); + struct acpi_device *adev = ACPI_COMPANION(dev); if (adev && dev->pm_domain == &acpi_general_pm_domain) { - dev->pm_domain = NULL; - acpi_remove_pm_notifier(adev, acpi_wakeup_device); + dev_pm_domain_set(dev, NULL); + acpi_remove_pm_notifier(adev); if (power_off) { /* * If the device's PM QoS resume latency limit or flags @@ -1025,66 +1419,118 @@ void acpi_dev_pm_detach(struct device *dev, bool power_off) */ dev_pm_qos_hide_latency_limit(dev); dev_pm_qos_hide_flags(dev); - __acpi_device_run_wake(adev, false); + acpi_device_wakeup_disable(adev); acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0); } } } -EXPORT_SYMBOL_GPL(acpi_dev_pm_detach); /** - * acpi_dev_pm_add_dependent - Add physical device depending for PM. - * @handle: Handle of ACPI device node. - * @depdev: Device depending on that node for PM. + * acpi_dev_pm_attach - Prepare device for ACPI power management. + * @dev: Device to prepare. + * @power_on: Whether or not to power on the device. + * + * If @dev has a valid ACPI handle that has a valid struct acpi_device object + * attached to it, install a wakeup notification handler for the device and + * add it to the general ACPI PM domain. If @power_on is set, the device will + * be put into the ACPI D0 state before the function returns. + * + * This assumes that the @dev's bus type uses generic power management callbacks + * (or doesn't use any power management callbacks at all). + * + * Callers must ensure proper synchronization of this function with power + * management callbacks. */ -void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev) +int acpi_dev_pm_attach(struct device *dev, bool power_on) { - struct acpi_device_physical_node *dep; - struct acpi_device *adev; - - if (!depdev || acpi_bus_get_device(handle, &adev)) - return; + /* + * Skip devices whose ACPI companions match the device IDs below, + * because they require special power management handling incompatible + * with the generic ACPI PM domain. + */ + static const struct acpi_device_id special_pm_ids[] = { + ACPI_FAN_DEVICE_IDS, + {} + }; + struct acpi_device *adev = ACPI_COMPANION(dev); - mutex_lock(&adev->physical_node_lock); + if (!adev || !acpi_match_device_ids(adev, special_pm_ids)) + return 0; - list_for_each_entry(dep, &adev->power_dependent, node) - if (dep->dev == depdev) - goto out; + /* + * Only attach the power domain to the first device if the + * companion is shared by multiple. This is to prevent doing power + * management twice. + */ + if (!acpi_device_is_first_physical_node(adev, dev)) + return 0; - dep = kzalloc(sizeof(*dep), GFP_KERNEL); - if (dep) { - dep->dev = depdev; - list_add_tail(&dep->node, &adev->power_dependent); + acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); + dev_pm_domain_set(dev, &acpi_general_pm_domain); + if (power_on) { + acpi_dev_pm_full_power(adev); + acpi_device_wakeup_disable(adev); } - out: - mutex_unlock(&adev->physical_node_lock); + return 1; } -EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent); +EXPORT_SYMBOL_GPL(acpi_dev_pm_attach); /** - * acpi_dev_pm_remove_dependent - Remove physical device depending for PM. - * @handle: Handle of ACPI device node. - * @depdev: Device depending on that node for PM. + * acpi_storage_d3 - Check if D3 should be used in the suspend path + * @dev: Device to check + * + * Return %true if the platform firmware wants @dev to be programmed + * into D3hot or D3cold (if supported) in the suspend path, or %false + * when there is no specific preference. On some platforms, if this + * hint is ignored, @dev may remain unresponsive after suspending the + * platform as a whole. + * + * Although the property has storage in the name it actually is + * applied to the PCIe slot and plugging in a non-storage device the + * same platform restrictions will likely apply. */ -void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev) +bool acpi_storage_d3(struct device *dev) { - struct acpi_device_physical_node *dep; - struct acpi_device *adev; + struct acpi_device *adev = ACPI_COMPANION(dev); + u8 val; - if (!depdev || acpi_bus_get_device(handle, &adev)) - return; + if (force_storage_d3()) + return true; - mutex_lock(&adev->physical_node_lock); + if (!adev) + return false; + if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable", + &val)) + return false; + return val == 1; +} +EXPORT_SYMBOL_GPL(acpi_storage_d3); - list_for_each_entry(dep, &adev->power_dependent, node) - if (dep->dev == depdev) { - list_del(&dep->node); - kfree(dep); - break; - } +/** + * acpi_dev_state_d0 - Tell if the device is in D0 power state + * @dev: Physical device the ACPI power state of which to check + * + * On a system without ACPI, return true. On a system with ACPI, return true if + * the current ACPI power state of the device is D0, or false otherwise. + * + * Note that the power state of a device is not well-defined after it has been + * passed to acpi_device_set_power() and before that function returns, so it is + * not valid to ask for the ACPI power state of the device in that time frame. + * + * This function is intended to be used in a driver's probe or remove + * function. See Documentation/firmware-guide/acpi/non-d0-probe.rst for + * more information. + */ +bool acpi_dev_state_d0(struct device *dev) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); - mutex_unlock(&adev->physical_node_lock); + if (!adev) + return true; + + return adev->power.state == ACPI_STATE_D0; } -EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent); +EXPORT_SYMBOL_GPL(acpi_dev_state_d0); + #endif /* CONFIG_PM */ |