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authorJean Pihet <j-pihet@ti.com>2011-08-25 17:35:41 +0400
committerRafael J. Wysocki <rjw@sisk.pl>2011-08-25 17:35:41 +0400
commit91ff4cb803df6de9114351b9f2f0f39f397ee03e (patch)
treeeb24c7df28d0f93557ac1d9e7d72a79fc3556b97 /include/linux/pm.h
parentabe98ec2d86279fe821c9051003a0abc43444f15 (diff)
downloadlinux-91ff4cb803df6de9114351b9f2f0f39f397ee03e.tar.xz
PM QoS: Implement per-device PM QoS constraints
Implement the per-device PM QoS constraints by creating a device PM QoS API, which calls the PM QoS constraints management core code. The per-device latency constraints data strctures are stored in the device dev_pm_info struct. The device PM code calls the init and destroy of the per-device constraints data struct in order to support the dynamic insertion and removal of the devices in the system. To minimize the data usage by the per-device constraints, the data struct is only allocated at the first call to dev_pm_qos_add_request. The data is later free'd when the device is removed from the system. A global mutex protects the constraints users from the data being allocated and free'd. Signed-off-by: Jean Pihet <j-pihet@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include/linux/pm.h')
-rw-r--r--include/linux/pm.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h
index ed10f24d5259..d78187e9ca99 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -419,6 +419,13 @@ enum rpm_request {
RPM_REQ_RESUME,
};
+/* Per-device PM QoS constraints data struct state */
+enum dev_pm_qos_state {
+ DEV_PM_QOS_NO_DEVICE, /* No device present */
+ DEV_PM_QOS_DEVICE_PRESENT, /* Device present, data not allocated */
+ DEV_PM_QOS_ALLOCATED, /* Device present, data allocated */
+};
+
struct wakeup_source;
struct pm_domain_data {
@@ -480,6 +487,8 @@ struct dev_pm_info {
unsigned long accounting_timestamp;
#endif
struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
+ struct pm_qos_constraints *constraints;
+ enum dev_pm_qos_state constraints_state;
};
extern void update_pm_runtime_accounting(struct device *dev);