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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-10-24 02:08:18 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-10-24 02:08:18 +0200
commite39473d0b9448e770f49b0b15e514be884264438 (patch)
treea6fbf50c1fcd8e7cfd176425384a82fe06d3cadd /include/linux/pm_qos.h
parentae0fb4b72c8db7e6c4ef32bc58a43a759ad414b9 (diff)
PM / QoS: Make it possible to expose PM QoS device flags to user space
Define two device PM QoS flags, PM_QOS_FLAG_NO_POWER_OFF and PM_QOS_FLAG_REMOTE_WAKEUP, and introduce routines dev_pm_qos_expose_flags() and dev_pm_qos_hide_flags() allowing the caller to expose those two flags to user space or to hide them from it, respectively. After the flags have been exposed, user space will see two additional sysfs attributes, pm_qos_no_power_off and pm_qos_remote_wakeup, under the device's /sys/devices/.../power/ directory. Then, writing 1 to one of them will update the PM QoS flags request owned by user space so that the corresponding flag is requested to be set. In turn, writing 0 to one of them will cause the corresponding flag in the user space's request to be cleared (however, the owners of the other PM QoS flags requests for the same device may still request the flag to be set and it may be effectively set even if user space doesn't request that). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Jean Pihet <j-pihet@ti.com> Acked-by: mark gross <markgross@thegnar.org>
Diffstat (limited to 'include/linux/pm_qos.h')
-rw-r--r--include/linux/pm_qos.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 3af7d8573c23..5a95013905c8 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -34,6 +34,9 @@ enum pm_qos_flags_status {
#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
#define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
+#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
+#define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
+
struct pm_qos_request {
struct plist_node node;
int pm_qos_class;
@@ -86,6 +89,8 @@ struct pm_qos_flags {
struct dev_pm_qos {
struct pm_qos_constraints latency;
struct pm_qos_flags flags;
+ struct dev_pm_qos_request *latency_req;
+ struct dev_pm_qos_request *flags_req;
};
/* Action requested to pm_qos_update_target */
@@ -187,10 +192,31 @@ static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
#ifdef CONFIG_PM_RUNTIME
int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
void dev_pm_qos_hide_latency_limit(struct device *dev);
+int dev_pm_qos_expose_flags(struct device *dev, s32 value);
+void dev_pm_qos_hide_flags(struct device *dev);
+int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
+
+static inline s32 dev_pm_qos_requested_latency(struct device *dev)
+{
+ return dev->power.qos->latency_req->data.pnode.prio;
+}
+
+static inline s32 dev_pm_qos_requested_flags(struct device *dev)
+{
+ return dev->power.qos->flags_req->data.flr.flags;
+}
#else
static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
{ return 0; }
static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
+static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
+ { return 0; }
+static inline void dev_pm_qos_hide_flags(struct device *dev) {}
+static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
+ { return 0; }
+
+static inline s32 dev_pm_qos_requested_latency(struct device *dev) { return 0; }
+static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
#endif
#endif