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Date: Tue, 6 Nov 2012 12:56:07 +0800
From: Aaron Lu <aaron.lu@...el.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Linux PM list <linux-pm@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Huang Ying <ying.huang@...el.com>,
LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
Lv Zheng <lv.zheng@...el.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 2/7] ACPI / PM: Move device power state selection routine
to device_pm.c
This patch doesn't apply...
I'm trying on Linus' master branch, HEAD is v3.7-rc4, and I've merged
your pm-qos branch on top of v3.7-rc4.
Thanks,
Aaron
On Mon, Oct 29, 2012 at 10:09:09AM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The ACPI function for choosing device power state is now located
> in drivers/acpi/sleep.c, but drivers/acpi/device_pm.c is a more
> logical place for it, so move it there.
>
> However, instead of moving the function entirely, move its core only
> under a different name and with a different list of arguments, so
> that it is more flexible, and leave a wrapper around it in the
> original location.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> drivers/acpi/device_pm.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/sleep.c | 88 +-------------------------------------
> include/acpi/acpi_bus.h | 15 ++++++
> 3 files changed, 124 insertions(+), 86 deletions(-)
>
> Index: linux/drivers/acpi/device_pm.c
> ===================================================================
> --- linux.orig/drivers/acpi/device_pm.c
> +++ linux/drivers/acpi/device_pm.c
> @@ -23,7 +23,9 @@
> */
>
> #include <linux/device.h>
> +#include <linux/export.h>
> #include <linux/mutex.h>
> +#include <linux/pm_qos.h>
>
> #include <acpi/acpi.h>
> #include <acpi/acpi_bus.h>
> @@ -89,3 +91,108 @@ acpi_status acpi_remove_pm_notifier(stru
> mutex_unlock(&acpi_pm_notifier_lock);
> return status;
> }
> +
> +/**
> + * acpi_device_power_state - Get preferred power state of ACPI device.
> + * @dev: Device whose preferred target power state to return.
> + * @adev: ACPI device node corresponding to @dev.
> + * @target_state: System state to match the resultant device state.
> + * @d_max_in: Deepest low-power state to take into consideration.
> + * @d_min_p: Location to store the upper limit of the allowed states range.
> + * Return value: Preferred power state of the device on success, -ENODEV
> + * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
> + *
> + * Find the lowest power (highest number) ACPI device power state that the
> + * device can be in while the system is in the state represented by
> + * @target_state. If @d_min_p is set, the highest power (lowest number) device
> + * power state that @dev can be in for the given system sleep state is stored
> + * at the location pointed to by it.
> + *
> + * Callers must ensure that @dev and @adev are valid pointers and that @adev
> + * actually corresponds to @dev before using this function.
> + */
> +int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
> + u32 target_state, int d_max_in, int *d_min_p)
> +{
> + char acpi_method[] = "_SxD";
> + unsigned long long d_min, d_max;
> + bool wakeup = false;
> +
> + if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
> + return -EINVAL;
> +
> + if (d_max_in > ACPI_STATE_D3_HOT) {
> + 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;
> + }
> +
> + acpi_method[2] = '0' + target_state;
> + /*
> + * If the sleep state is S0, the lowest limit from ACPI is D3,
> + * but if the device has _S0W, we will use the value from _S0W
> + * as the lowest limit from ACPI. Finally, we will constrain
> + * the lowest limit with the specified one.
> + */
> + d_min = ACPI_STATE_D0;
> + d_max = ACPI_STATE_D3;
> +
> + /*
> + * If present, _SxD methods return the minimum D-state (highest power
> + * state) we can use for the corresponding S-states. Otherwise, the
> + * minimum D-state is D0 (ACPI 3.x).
> + *
> + * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
> + * provided -- that's our fault recovery, we ignore retval.
> + */
> + if (target_state > ACPI_STATE_S0) {
> + acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
> + 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) {
> + wakeup = adev->wakeup.flags.valid;
> + }
> +
> + /*
> + * If _PRW says we can wake up the system from the target sleep state,
> + * the D-state returned by _SxD is sufficient for that (we assume a
> + * wakeup-aware driver if wake is set). Still, if _SxW exists
> + * (ACPI 3.x), it should return the maximum (lowest power) D-state that
> + * can wake the system. _S0W may be valid, too.
> + */
> + if (wakeup) {
> + acpi_status status;
> +
> + acpi_method[3] = 'W';
> + status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
> + &d_max);
> + if (ACPI_FAILURE(status)) {
> + if (target_state != ACPI_STATE_S0 ||
> + status != AE_NOT_FOUND)
> + d_max = d_min;
> + } else if (d_max < d_min) {
> + /* Warn the user of the broken DSDT */
> + printk(KERN_WARNING "ACPI: Wrong value from %s\n",
> + acpi_method);
> + /* Sanitize it */
> + d_min = d_max;
> + }
> + }
> +
> + if (d_max_in < d_min)
> + return -EINVAL;
> + if (d_min_p)
> + *d_min_p = d_min;
> + /* constrain d_max with specified lowest limit (max number) */
> + if (d_max > d_max_in) {
> + for (d_max = d_max_in; d_max > d_min; d_max--) {
> + if (adev->power.states[d_max].flags.valid)
> + break;
> + }
> + }
> + return d_max;
> +}
> +EXPORT_SYMBOL_GPL(acpi_device_power_state);
> Index: linux/drivers/acpi/sleep.c
> ===================================================================
> --- linux.orig/drivers/acpi/sleep.c
> +++ linux/drivers/acpi/sleep.c
> @@ -19,7 +19,6 @@
> #include <linux/acpi.h>
> #include <linux/module.h>
> #include <linux/pm_runtime.h>
> -#include <linux/pm_qos.h>
>
> #include <asm/io.h>
>
> @@ -706,101 +705,20 @@ int acpi_suspend(u32 acpi_state)
> * Return value: Preferred power state of the device on success, -ENODEV
> * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
> *
> - * Find the lowest power (highest number) ACPI device power state that the
> - * device can be in while the system is in the sleep state represented
> - * by %acpi_target_sleep_state. If @d_min_p is set, the highest power (lowest
> - * number) device power state that @dev can be in for the given system sleep
> - * state is stored at the location pointed to by it.
> - *
> * The caller must ensure that @dev is valid before using this function.
> */
> 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;
> - char acpi_method[] = "_SxD";
> - unsigned long long d_min, d_max;
> - bool wakeup = false;
>
> - if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
> - return -EINVAL;
> if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
> - printk(KERN_DEBUG "ACPI handle has no context!\n");
> + dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
> return -ENODEV;
> }
> - if (d_max_in > ACPI_STATE_D3_HOT) {
> - 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;
> - }
> -
> - acpi_method[2] = '0' + acpi_target_sleep_state;
> - /*
> - * If the sleep state is S0, the lowest limit from ACPI is D3,
> - * but if the device has _S0W, we will use the value from _S0W
> - * as the lowest limit from ACPI. Finally, we will constrain
> - * the lowest limit with the specified one.
> - */
> - d_min = ACPI_STATE_D0;
> - d_max = ACPI_STATE_D3;
>
> - /*
> - * If present, _SxD methods return the minimum D-state (highest power
> - * state) we can use for the corresponding S-states. Otherwise, the
> - * minimum D-state is D0 (ACPI 3.x).
> - *
> - * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
> - * provided -- that's our fault recovery, we ignore retval.
> - */
> - if (acpi_target_sleep_state > ACPI_STATE_S0) {
> - acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
> - wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
> - && adev->wakeup.sleep_state >= acpi_target_sleep_state;
> - } else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
> - PM_QOS_FLAGS_NONE) {
> - wakeup = adev->wakeup.flags.valid;
> - }
> -
> - /*
> - * If _PRW says we can wake up the system from the target sleep state,
> - * the D-state returned by _SxD is sufficient for that (we assume a
> - * wakeup-aware driver if wake is set). Still, if _SxW exists
> - * (ACPI 3.x), it should return the maximum (lowest power) D-state that
> - * can wake the system. _S0W may be valid, too.
> - */
> - if (wakeup) {
> - acpi_status status;
> -
> - acpi_method[3] = 'W';
> - status = acpi_evaluate_integer(handle, acpi_method, NULL,
> - &d_max);
> - if (ACPI_FAILURE(status)) {
> - if (acpi_target_sleep_state != ACPI_STATE_S0 ||
> - status != AE_NOT_FOUND)
> - d_max = d_min;
> - } else if (d_max < d_min) {
> - /* Warn the user of the broken DSDT */
> - printk(KERN_WARNING "ACPI: Wrong value from %s\n",
> - acpi_method);
> - /* Sanitize it */
> - d_min = d_max;
> - }
> - }
> -
> - if (d_max_in < d_min)
> - return -EINVAL;
> - if (d_min_p)
> - *d_min_p = d_min;
> - /* constrain d_max with specified lowest limit (max number) */
> - if (d_max > d_max_in) {
> - for (d_max = d_max_in; d_max > d_min; d_max--) {
> - if (adev->power.states[d_max].flags.valid)
> - break;
> - }
> - }
> - return d_max;
> + return acpi_device_power_state(dev, adev, acpi_target_sleep_state,
> + d_max_in, d_min_p);
> }
> EXPORT_SYMBOL(acpi_pm_device_sleep_state);
> #endif /* CONFIG_PM */
> Index: linux/include/acpi/acpi_bus.h
> ===================================================================
> --- linux.orig/include/acpi/acpi_bus.h
> +++ linux/include/acpi/acpi_bus.h
> @@ -419,6 +419,8 @@ acpi_status acpi_add_pm_notifier(struct
> acpi_notify_handler handler, void *context);
> acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
> acpi_notify_handler handler);
> +int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
> + u32 target_state, int d_max_in, int *d_min_p);
> int acpi_pm_device_sleep_state(struct device *, int *, int);
> #else
> static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
> @@ -432,12 +434,23 @@ static inline acpi_status acpi_remove_pm
> {
> return AE_SUPPORT;
> }
> -static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
> +static inline int __acpi_device_power_state(int m, int *p)
> {
> if (p)
> *p = ACPI_STATE_D0;
> return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3) ? m : ACPI_STATE_D0;
> }
> +static inline int acpi_device_power_state(struct device *dev,
> + struct acpi_device *adev,
> + u32 target_state, int d_max_in,
> + int *d_min_p)
> +{
> + return __acpi_device_power_state(d_max_in, d_min_p);
> +}
> +static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)
> +{
> + return __acpi_device_power_state(m, p);
> +}
> #endif
>
> #ifdef CONFIG_PM_RUNTIME
>
--
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