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-rw-r--r--drivers/base/power/domain.c551
-rw-r--r--include/linux/pm_domain.h12
2 files changed, 548 insertions, 15 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index f14ba32..33086e9 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -21,7 +21,7 @@ static struct generic_pm_domain *dev_to_genpd(struct device *dev)
if (IS_ERR_OR_NULL(dev->pm_domain))
return ERR_PTR(-EINVAL);
- return container_of(dev->pm_domain, struct generic_pm_domain, domain);
+ return pd_to_genpd(dev->pm_domain);
}
static void genpd_sd_counter_dec(struct generic_pm_domain *genpd)
@@ -46,7 +46,8 @@ static int pm_genpd_poweron(struct generic_pm_domain *genpd)
mutex_lock(&genpd->parent->lock);
mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
- if (!genpd->power_is_off)
+ if (!genpd->power_is_off
+ || (genpd->prepared_count > 0 && genpd->suspend_power_off))
goto out;
if (genpd->parent && genpd->parent->power_is_off) {
@@ -155,7 +156,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
unsigned int not_suspended;
int ret;
- if (genpd->power_is_off)
+ if (genpd->power_is_off || genpd->prepared_count > 0)
return 0;
if (genpd->sd_count > 0)
@@ -260,6 +261,27 @@ static int pm_genpd_runtime_suspend(struct device *dev)
}
/**
+ * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
+ * @dev: Device to resume.
+ * @genpd: PM domain the device belongs to.
+ */
+static void __pm_genpd_runtime_resume(struct device *dev,
+ struct generic_pm_domain *genpd)
+{
+ struct dev_list_entry *dle;
+
+ list_for_each_entry(dle, &genpd->dev_list, node) {
+ if (dle->dev == dev) {
+ __pm_genpd_restore_device(dle, genpd);
+ break;
+ }
+ }
+
+ if (genpd->start_device)
+ genpd->start_device(dev);
+}
+
+/**
* pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
* @dev: Device to resume.
*
@@ -270,7 +292,6 @@ static int pm_genpd_runtime_suspend(struct device *dev)
static int pm_genpd_runtime_resume(struct device *dev)
{
struct generic_pm_domain *genpd;
- struct dev_list_entry *dle;
int ret;
dev_dbg(dev, "%s()\n", __func__);
@@ -284,17 +305,7 @@ static int pm_genpd_runtime_resume(struct device *dev)
return ret;
mutex_lock(&genpd->lock);
-
- list_for_each_entry(dle, &genpd->dev_list, node) {
- if (dle->dev == dev) {
- __pm_genpd_restore_device(dle, genpd);
- break;
- }
- }
-
- if (genpd->start_device)
- genpd->start_device(dev);
-
+ __pm_genpd_runtime_resume(dev, genpd);
mutex_unlock(&genpd->lock);
return 0;
@@ -303,12 +314,493 @@ static int pm_genpd_runtime_resume(struct device *dev)
#else
static inline void genpd_power_off_work_fn(struct work_struct *work) {}
+static inline void __pm_genpd_runtime_resume(struct device *dev,
+ struct generic_pm_domain *genpd) {}
#define pm_genpd_runtime_suspend NULL
#define pm_genpd_runtime_resume NULL
#endif /* CONFIG_PM_RUNTIME */
+#ifdef CONFIG_PM_SLEEP
+
+/**
+ * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents.
+ * @genpd: PM domain to power off, if possible.
+ *
+ * Check if the given PM domain can be powered off (during system suspend or
+ * hibernation) and do that if so. Also, in that case propagate to its parent.
+ *
+ * This function is only called in "noirq" stages of system power transitions,
+ * so it need not acquire locks (all of the "noirq" callbacks are executed
+ * sequentially, so it is guaranteed that it will never run twice in parallel).
+ */
+static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
+{
+ struct generic_pm_domain *parent = genpd->parent;
+
+ if (genpd->power_is_off)
+ return;
+
+ if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0)
+ return;
+
+ if (genpd->power_off)
+ genpd->power_off(genpd);
+
+ genpd->power_is_off = true;
+ if (parent) {
+ genpd_sd_counter_dec(parent);
+ pm_genpd_sync_poweroff(parent);
+ }
+}
+
+/**
+ * pm_genpd_prepare - Start power transition of a device in a PM domain.
+ * @dev: Device to start the transition of.
+ *
+ * Start a power transition of a device (during a system-wide power transition)
+ * under the assumption that its pm_domain field points to the domain member of
+ * an object of type struct generic_pm_domain representing a PM domain
+ * consisting of I/O devices.
+ */
+static int pm_genpd_prepare(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ mutex_lock(&genpd->lock);
+
+ if (genpd->prepared_count++ == 0)
+ genpd->suspend_power_off = genpd->power_is_off;
+
+ if (genpd->suspend_power_off) {
+ mutex_unlock(&genpd->lock);
+ return 0;
+ }
+
+ /*
+ * If the device is in the (runtime) "suspended" state, call
+ * .start_device() for it, if defined.
+ */
+ if (pm_runtime_suspended(dev))
+ __pm_genpd_runtime_resume(dev, genpd);
+
+ /*
+ * Do not check if runtime resume is pending at this point, because it
+ * has been taken care of already and if pm_genpd_poweron() ran at this
+ * point as a result of the check, it would deadlock.
+ */
+ __pm_runtime_disable(dev, false);
+
+ mutex_unlock(&genpd->lock);
+
+ return pm_generic_prepare(dev);
+}
+
+/**
+ * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Suspend a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_suspend(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
+}
+
+/**
+ * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Carry out a late suspend of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_suspend_noirq(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+ int ret;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ if (genpd->suspend_power_off)
+ return 0;
+
+ ret = pm_generic_suspend_noirq(dev);
+ if (ret)
+ return ret;
+
+ if (genpd->stop_device)
+ genpd->stop_device(dev);
+
+ /*
+ * Since all of the "noirq" callbacks are executed sequentially, it is
+ * guaranteed that this function will never run twice in parallel for
+ * the same PM domain, so it is not necessary to use locking here.
+ */
+ genpd->suspended_count++;
+ pm_genpd_sync_poweroff(genpd);
+
+ return 0;
+}
+
+/**
+ * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Carry out an early resume of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_resume_noirq(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ if (genpd->suspend_power_off)
+ return 0;
+
+ /*
+ * Since all of the "noirq" callbacks are executed sequentially, it is
+ * guaranteed that this function will never run twice in parallel for
+ * the same PM domain, so it is not necessary to use locking here.
+ */
+ pm_genpd_poweron(genpd);
+ genpd->suspended_count--;
+ if (genpd->start_device)
+ genpd->start_device(dev);
+
+ return pm_generic_resume_noirq(dev);
+}
+
+/**
+ * pm_genpd_resume - Resume a device belonging to an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Resume a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_resume(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
+}
+
+/**
+ * pm_genpd_freeze - Freeze a device belonging to an I/O power domain.
+ * @dev: Device to freeze.
+ *
+ * Freeze a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_freeze(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
+}
+
+/**
+ * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain.
+ * @dev: Device to freeze.
+ *
+ * Carry out a late freeze of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_freeze_noirq(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+ int ret;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ if (genpd->suspend_power_off)
+ return 0;
+
+ ret = pm_generic_freeze_noirq(dev);
+ if (ret)
+ return ret;
+
+ if (genpd->stop_device)
+ genpd->stop_device(dev);
+
+ return 0;
+}
+
+/**
+ * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain.
+ * @dev: Device to thaw.
+ *
+ * Carry out an early thaw of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_thaw_noirq(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ if (genpd->suspend_power_off)
+ return 0;
+
+ if (genpd->start_device)
+ genpd->start_device(dev);
+
+ return pm_generic_thaw_noirq(dev);
+}
+
+/**
+ * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
+ * @dev: Device to thaw.
+ *
+ * Thaw a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_thaw(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
+}
+
+/**
+ * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain.
+ * @dev: Device to suspend.
+ *
+ * Power off a device under the assumption that its pm_domain field points to
+ * the domain member of an object of type struct generic_pm_domain representing
+ * a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_dev_poweroff(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev);
+}
+
+/**
+ * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain.
+ * @dev: Device to suspend.
+ *
+ * Carry out a late powering off of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a PM domain consisting of I/O devices.
+ */
+static int pm_genpd_dev_poweroff_noirq(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+ int ret;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ if (genpd->suspend_power_off)
+ return 0;
+
+ ret = pm_generic_poweroff_noirq(dev);
+ if (ret)
+ return ret;
+
+ if (genpd->stop_device)
+ genpd->stop_device(dev);
+
+ /*
+ * Since all of the "noirq" callbacks are executed sequentially, it is
+ * guaranteed that this function will never run twice in parallel for
+ * the same PM domain, so it is not necessary to use locking here.
+ */
+ genpd->suspended_count++;
+ pm_genpd_sync_poweroff(genpd);
+
+ return 0;
+}
+
+/**
+ * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Carry out an early restore of a device under the assumption that its
+ * pm_domain field points to the domain member of an object of type
+ * struct generic_pm_domain representing a power domain consisting of I/O
+ * devices.
+ */
+static int pm_genpd_restore_noirq(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ /*
+ * Since all of the "noirq" callbacks are executed sequentially, it is
+ * guaranteed that this function will never run twice in parallel for
+ * the same PM domain, so it is not necessary to use locking here.
+ */
+ genpd->power_is_off = true;
+ if (genpd->suspend_power_off) {
+ /*
+ * The boot kernel might put the domain into the power on state,
+ * so make sure it really is powered off.
+ */
+ if (genpd->power_off)
+ genpd->power_off(genpd);
+ return 0;
+ }
+
+ pm_genpd_poweron(genpd);
+ genpd->suspended_count--;
+ if (genpd->start_device)
+ genpd->start_device(dev);
+
+ return pm_generic_restore_noirq(dev);
+}
+
+/**
+ * pm_genpd_restore - Restore a device belonging to an I/O power domain.
+ * @dev: Device to resume.
+ *
+ * Restore a device under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static int pm_genpd_restore(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return -EINVAL;
+
+ return genpd->suspend_power_off ? 0 : pm_generic_restore(dev);
+}
+
+/**
+ * pm_genpd_complete - Complete power transition of a device in a power domain.
+ * @dev: Device to complete the transition of.
+ *
+ * Complete a power transition of a device (during a system-wide power
+ * transition) under the assumption that its pm_domain field points to the
+ * domain member of an object of type struct generic_pm_domain representing
+ * a power domain consisting of I/O devices.
+ */
+static void pm_genpd_complete(struct device *dev)
+{
+ struct generic_pm_domain *genpd;
+ bool run_complete;
+
+ dev_dbg(dev, "%s()\n", __func__);
+
+ genpd = dev_to_genpd(dev);
+ if (IS_ERR(genpd))
+ return;
+
+ mutex_lock(&genpd->lock);
+
+ run_complete = !genpd->suspend_power_off;
+ if (--genpd->prepared_count == 0)
+ genpd->suspend_power_off = false;
+
+ mutex_unlock(&genpd->lock);
+
+ if (run_complete) {
+ pm_generic_complete(dev);
+ pm_runtime_enable(dev);
+ }
+}
+
+#else
+
+#define pm_genpd_prepare NULL
+#define pm_genpd_suspend NULL
+#define pm_genpd_suspend_noirq NULL
+#define pm_genpd_resume_noirq NULL
+#define pm_genpd_resume NULL
+#define pm_genpd_freeze NULL
+#define pm_genpd_freeze_noirq NULL
+#define pm_genpd_thaw_noirq NULL
+#define pm_genpd_thaw NULL
+#define pm_genpd_dev_poweroff_noirq NULL
+#define pm_genpd_dev_poweroff NULL
+#define pm_genpd_restore_noirq NULL
+#define pm_genpd_restore NULL
+#define pm_genpd_complete NULL
+
+#endif /* CONFIG_PM_SLEEP */
+
/**
* pm_genpd_add_device - Add a device to an I/O PM domain.
* @genpd: PM domain to add the device to.
@@ -331,6 +823,11 @@ int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
goto out;
}
+ if (genpd->prepared_count > 0) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
list_for_each_entry(dle, &genpd->dev_list, node)
if (dle->dev == dev) {
ret = -EINVAL;
@@ -346,6 +843,7 @@ int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
dle->dev = dev;
dle->need_restore = false;
list_add_tail(&dle->node, &genpd->dev_list);
+ genpd->device_count++;
spin_lock_irq(&dev->power.lock);
dev->pm_domain = &genpd->domain;
@@ -375,6 +873,11 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
mutex_lock(&genpd->lock);
+ if (genpd->prepared_count > 0) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
list_for_each_entry(dle, &genpd->dev_list, node) {
if (dle->dev != dev)
continue;
@@ -383,6 +886,7 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
dev->pm_domain = NULL;
spin_unlock_irq(&dev->power.lock);
+ genpd->device_count--;
list_del(&dle->node);
kfree(dle);
@@ -390,6 +894,7 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
break;
}
+ out:
mutex_unlock(&genpd->lock);
return ret;
@@ -498,7 +1003,23 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
genpd->in_progress = 0;
genpd->sd_count = 0;
genpd->power_is_off = is_off;
+ genpd->device_count = 0;
+ genpd->suspended_count = 0;
genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
+ genpd->domain.ops.prepare = pm_genpd_prepare;
+ genpd->domain.ops.suspend = pm_genpd_suspend;
+ genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
+ genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
+ genpd->domain.ops.resume = pm_genpd_resume;
+ genpd->domain.ops.freeze = pm_genpd_freeze;
+ genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
+ genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
+ genpd->domain.ops.thaw = pm_genpd_thaw;
+ genpd->domain.ops.poweroff = pm_genpd_dev_poweroff;
+ genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq;
+ genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
+ genpd->domain.ops.restore = pm_genpd_restore;
+ genpd->domain.ops.complete = pm_genpd_complete;
}
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index b1a22c6..7961b0d 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -11,6 +11,9 @@
#include <linux/device.h>
+#define GPD_IN_SUSPEND 1
+#define GPD_POWER_OFF 2
+
struct dev_power_governor {
bool (*power_down_ok)(struct dev_pm_domain *domain);
};
@@ -27,12 +30,21 @@ struct generic_pm_domain {
unsigned int in_progress; /* Number of devices being suspended now */
unsigned int sd_count; /* Number of subdomains with power "on" */
bool power_is_off; /* Whether or not power has been removed */
+ unsigned int device_count; /* Number of devices */
+ unsigned int suspended_count; /* System suspend device counter */
+ unsigned int prepared_count; /* Suspend counter of prepared devices */
+ bool suspend_power_off; /* Power status before system suspend */
int (*power_off)(struct generic_pm_domain *domain);
int (*power_on)(struct generic_pm_domain *domain);
int (*start_device)(struct device *dev);
int (*stop_device)(struct device *dev);
};
+static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
+{
+ return container_of(pd, struct generic_pm_domain, domain);
+}
+
struct dev_list_entry {
struct list_head node;
struct device *dev;
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