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authorRafael J. Wysocki <rjw@sisk.pl>2012-03-16 21:49:24 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2012-03-16 21:49:24 +0100
commit59fb53ea75eef4aa029cf31c88cdacec2f7b794b (patch)
treefb2ee7f8e99a72fe858e76ba7f2dbbc0390f3128 /drivers/base
parented819e3b964bba8bfae8e65d4d55a3f345f8da16 (diff)
parentefe6a8ad7fc55b350ce968cae4c757d35e986285 (diff)
Merge branch 'pm-qos'
* pm-qos: sh_mmcif / PM: Use PM QoS latency constraint tmio_mmc / PM: Use PM QoS latency constraint PM / QoS: Make it possible to expose PM QoS latency constraints
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/power.h4
-rw-r--r--drivers/base/power/qos.c61
-rw-r--r--drivers/base/power/sysfs.c47
3 files changed, 112 insertions, 0 deletions
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 9bf62323aaf..eeb4bff9505 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -71,6 +71,8 @@ extern void dpm_sysfs_remove(struct device *dev);
extern void rpm_sysfs_remove(struct device *dev);
extern int wakeup_sysfs_add(struct device *dev);
extern void wakeup_sysfs_remove(struct device *dev);
+extern int pm_qos_sysfs_add(struct device *dev);
+extern void pm_qos_sysfs_remove(struct device *dev);
#else /* CONFIG_PM */
@@ -79,5 +81,7 @@ static inline void dpm_sysfs_remove(struct device *dev) {}
static inline void rpm_sysfs_remove(struct device *dev) {}
static inline int wakeup_sysfs_add(struct device *dev) { return 0; }
static inline void wakeup_sysfs_remove(struct device *dev) {}
+static inline int pm_qos_sysfs_add(struct device *dev) { return 0; }
+static inline void pm_qos_sysfs_remove(struct device *dev) {}
#endif
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index c5d35883746..71855570922 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -41,6 +41,7 @@
#include <linux/mutex.h>
#include <linux/export.h>
+#include "power.h"
static DEFINE_MUTEX(dev_pm_qos_mtx);
@@ -166,6 +167,12 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
struct dev_pm_qos_request *req, *tmp;
struct pm_qos_constraints *c;
+ /*
+ * If the device's PM QoS resume latency limit has been exposed to user
+ * space, it has to be hidden at this point.
+ */
+ dev_pm_qos_hide_latency_limit(dev);
+
mutex_lock(&dev_pm_qos_mtx);
dev->power.power_state = PMSG_INVALID;
@@ -445,3 +452,57 @@ int dev_pm_qos_add_ancestor_request(struct device *dev,
return error;
}
EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request);
+
+#ifdef CONFIG_PM_RUNTIME
+static void __dev_pm_qos_drop_user_request(struct device *dev)
+{
+ dev_pm_qos_remove_request(dev->power.pq_req);
+ dev->power.pq_req = 0;
+}
+
+/**
+ * dev_pm_qos_expose_latency_limit - Expose PM QoS latency limit to user space.
+ * @dev: Device whose PM QoS latency limit is to be exposed to user space.
+ * @value: Initial value of the latency limit.
+ */
+int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
+{
+ struct dev_pm_qos_request *req;
+ int ret;
+
+ if (!device_is_registered(dev) || value < 0)
+ return -EINVAL;
+
+ if (dev->power.pq_req)
+ return -EEXIST;
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
+
+ ret = dev_pm_qos_add_request(dev, req, value);
+ if (ret < 0)
+ return ret;
+
+ dev->power.pq_req = req;
+ ret = pm_qos_sysfs_add(dev);
+ if (ret)
+ __dev_pm_qos_drop_user_request(dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);
+
+/**
+ * dev_pm_qos_hide_latency_limit - Hide PM QoS latency limit from user space.
+ * @dev: Device whose PM QoS latency limit is to be hidden from user space.
+ */
+void dev_pm_qos_hide_latency_limit(struct device *dev)
+{
+ if (dev->power.pq_req) {
+ pm_qos_sysfs_remove(dev);
+ __dev_pm_qos_drop_user_request(dev);
+ }
+}
+EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit);
+#endif /* CONFIG_PM_RUNTIME */
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index adf41be0ea6..95c12f6cb5b 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -5,6 +5,7 @@
#include <linux/device.h>
#include <linux/string.h>
#include <linux/export.h>
+#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/atomic.h>
#include <linux/jiffies.h>
@@ -217,6 +218,31 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev,
static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
autosuspend_delay_ms_store);
+static ssize_t pm_qos_latency_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", dev->power.pq_req->node.prio);
+}
+
+static ssize_t pm_qos_latency_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ s32 value;
+ int ret;
+
+ if (kstrtos32(buf, 0, &value))
+ return -EINVAL;
+
+ if (value < 0)
+ return -EINVAL;
+
+ ret = dev_pm_qos_update_request(dev->power.pq_req, value);
+ return ret < 0 ? ret : n;
+}
+
+static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
+ pm_qos_latency_show, pm_qos_latency_store);
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
@@ -490,6 +516,17 @@ static struct attribute_group pm_runtime_attr_group = {
.attrs = runtime_attrs,
};
+static struct attribute *pm_qos_attrs[] = {
+#ifdef CONFIG_PM_RUNTIME
+ &dev_attr_pm_qos_resume_latency_us.attr,
+#endif /* CONFIG_PM_RUNTIME */
+ NULL,
+};
+static struct attribute_group pm_qos_attr_group = {
+ .name = power_group_name,
+ .attrs = pm_qos_attrs,
+};
+
int dpm_sysfs_add(struct device *dev)
{
int rc;
@@ -530,6 +567,16 @@ void wakeup_sysfs_remove(struct device *dev)
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
}
+int pm_qos_sysfs_add(struct device *dev)
+{
+ return sysfs_merge_group(&dev->kobj, &pm_qos_attr_group);
+}
+
+void pm_qos_sysfs_remove(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_attr_group);
+}
+
void rpm_sysfs_remove(struct device *dev)
{
sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);