Merge branch 'acpi-pm'
* acpi-pm: ACPI / PM: Rework and clean up acpi_dev_pm_get_state() ACPI / PM: Replace ACPI_STATE_D3 with ACPI_STATE_D3_COLD in device_pm.c ACPI / PM: Rename function acpi_device_power_state() and make it static ACPI / PM: acpi_processor_suspend() can be static xen / ACPI / sleep: Register an acpi_suspend_lowlevel callback. x86 / ACPI / sleep: Provide registration for acpi_suspend_lowlevel.
This commit is contained in:
Rafael J. Wysocki
@@ -419,62 +419,73 @@ bool acpi_bus_can_wakeup(acpi_handle handle)
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EXPORT_SYMBOL(acpi_bus_can_wakeup);
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/**
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* acpi_device_power_state - Get preferred power state of ACPI device.
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* acpi_dev_pm_get_state - Get preferred power state of ACPI device.
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* @dev: Device whose preferred target power state to return.
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* @adev: ACPI device node corresponding to @dev.
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* @target_state: System state to match the resultant device state.
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* @d_max_in: Deepest low-power state to take into consideration.
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* @d_min_p: Location to store the upper limit of the allowed states range.
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* Return value: Preferred power state of the device on success, -ENODEV
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* (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
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* @d_min_p: Location to store the highest power state available to the device.
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* @d_max_p: Location to store the lowest power state available to the device.
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*
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* Find the lowest power (highest number) ACPI device power state that the
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* device can be in while the system is in the state represented by
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* @target_state. If @d_min_p is set, the highest power (lowest number) device
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* power state that @dev can be in for the given system sleep state is stored
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* at the location pointed to by it.
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* Find the lowest power (highest number) and highest power (lowest number) ACPI
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* device power states that the device can be in while the system is in the
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* state represented by @target_state. Store the integer numbers representing
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* those stats in the memory locations pointed to by @d_max_p and @d_min_p,
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* respectively.
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*
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* Callers must ensure that @dev and @adev are valid pointers and that @adev
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* actually corresponds to @dev before using this function.
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*
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* Returns 0 on success or -ENODATA when one of the ACPI methods fails or
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* returns a value that doesn't make sense. The memory locations pointed to by
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* @d_max_p and @d_min_p are only modified on success.
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*/
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int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
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u32 target_state, int d_max_in, int *d_min_p)
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static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
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u32 target_state, int *d_min_p, int *d_max_p)
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{
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char acpi_method[] = "_SxD";
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unsigned long long d_min, d_max;
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char method[] = { '_', 'S', '0' + target_state, 'D', '\0' };
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acpi_handle handle = adev->handle;
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unsigned long long ret;
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int d_min, d_max;
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bool wakeup = false;
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acpi_status status;
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if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
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return -EINVAL;
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if (d_max_in > ACPI_STATE_D3_HOT) {
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enum pm_qos_flags_status stat;
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stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
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if (stat == PM_QOS_FLAGS_ALL)
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d_max_in = ACPI_STATE_D3_HOT;
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}
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acpi_method[2] = '0' + target_state;
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/*
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* If the sleep state is S0, the lowest limit from ACPI is D3,
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* but if the device has _S0W, we will use the value from _S0W
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* as the lowest limit from ACPI. Finally, we will constrain
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* the lowest limit with the specified one.
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* If the system state is S0, the lowest power state the device can be
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* in is D3cold, unless the device has _S0W and is supposed to signal
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* wakeup, in which case the return value of _S0W has to be used as the
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* lowest power state available to the device.
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*/
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d_min = ACPI_STATE_D0;
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d_max = ACPI_STATE_D3;
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d_max = ACPI_STATE_D3_COLD;
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/*
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* If present, _SxD methods return the minimum D-state (highest power
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* state) we can use for the corresponding S-states. Otherwise, the
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* minimum D-state is D0 (ACPI 3.x).
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*
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* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
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* provided -- that's our fault recovery, we ignore retval.
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*/
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if (target_state > ACPI_STATE_S0) {
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acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
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/*
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* We rely on acpi_evaluate_integer() not clobbering the integer
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* provided if AE_NOT_FOUND is returned.
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*/
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ret = d_min;
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status = acpi_evaluate_integer(handle, method, NULL, &ret);
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if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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|| ret > ACPI_STATE_D3_COLD)
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return -ENODATA;
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/*
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* We need to handle legacy systems where D3hot and D3cold are
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* the same and 3 is returned in both cases, so fall back to
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* D3cold if D3hot is not a valid state.
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*/
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if (!adev->power.states[ret].flags.valid) {
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if (ret == ACPI_STATE_D3_HOT)
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ret = ACPI_STATE_D3_COLD;
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else
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return -ENODATA;
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}
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d_min = ret;
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wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
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&& adev->wakeup.sleep_state >= target_state;
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} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
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@@ -490,38 +501,30 @@ int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
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* can wake the system. _S0W may be valid, too.
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*/
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if (wakeup) {
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acpi_status status;
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acpi_method[3] = 'W';
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status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
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&d_max);
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if (ACPI_FAILURE(status)) {
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if (target_state != ACPI_STATE_S0 ||
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status != AE_NOT_FOUND)
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method[3] = 'W';
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status = acpi_evaluate_integer(handle, method, NULL, &ret);
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if (status == AE_NOT_FOUND) {
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if (target_state > ACPI_STATE_S0)
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d_max = d_min;
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} else if (d_max < d_min) {
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/* Warn the user of the broken DSDT */
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printk(KERN_WARNING "ACPI: Wrong value from %s\n",
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acpi_method);
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/* Sanitize it */
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d_min = d_max;
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} else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
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/* Fall back to D3cold if ret is not a valid state. */
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if (!adev->power.states[ret].flags.valid)
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ret = ACPI_STATE_D3_COLD;
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d_max = ret > d_min ? ret : d_min;
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} else {
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return -ENODATA;
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}
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}
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if (d_max_in < d_min)
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return -EINVAL;
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if (d_min_p)
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*d_min_p = d_min;
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/* constrain d_max with specified lowest limit (max number) */
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if (d_max > d_max_in) {
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for (d_max = d_max_in; d_max > d_min; d_max--) {
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if (adev->power.states[d_max].flags.valid)
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break;
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}
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}
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return d_max;
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if (d_max_p)
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*d_max_p = d_max;
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_device_power_state);
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/**
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* acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
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@@ -529,7 +532,8 @@ EXPORT_SYMBOL_GPL(acpi_device_power_state);
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* @d_min_p: Location to store the upper limit of the allowed states range.
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* @d_max_in: Deepest low-power state to take into consideration.
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* Return value: Preferred power state of the device on success, -ENODEV
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* (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
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* if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
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* incorrect, or -ENODATA on ACPI method failure.
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*
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* The caller must ensure that @dev is valid before using this function.
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*/
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@@ -537,14 +541,39 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
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struct acpi_device *adev;
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int ret, d_max;
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if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD)
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return -EINVAL;
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if (d_max_in > ACPI_STATE_D3_HOT) {
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enum pm_qos_flags_status stat;
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stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
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if (stat == PM_QOS_FLAGS_ALL)
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d_max_in = ACPI_STATE_D3_HOT;
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}
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if (!handle || acpi_bus_get_device(handle, &adev)) {
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dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
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return -ENODEV;
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}
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return acpi_device_power_state(dev, adev, acpi_target_system_state(),
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d_max_in, d_min_p);
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ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(),
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d_min_p, &d_max);
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if (ret)
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return ret;
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if (d_max_in < *d_min_p)
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return -EINVAL;
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if (d_max > d_max_in) {
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for (d_max = d_max_in; d_max > *d_min_p; d_max--) {
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if (adev->power.states[d_max].flags.valid)
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break;
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}
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}
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return d_max;
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}
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EXPORT_SYMBOL(acpi_pm_device_sleep_state);
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@@ -695,17 +724,13 @@ struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
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static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
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u32 system_state)
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{
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int power_state;
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int ret, state;
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if (!acpi_device_power_manageable(adev))
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return 0;
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power_state = acpi_device_power_state(dev, adev, system_state,
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ACPI_STATE_D3, NULL);
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if (power_state < ACPI_STATE_D0 || power_state > ACPI_STATE_D3)
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return -EIO;
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return acpi_device_set_power(adev, power_state);
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ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state);
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return ret ? ret : acpi_device_set_power(adev, state);
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}
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/**
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