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PM QoS: Implement per-device PM QoS constraints

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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>
This commit is contained in:
Jean Pihet 2011-08-25 15:35:41 +02:00 • committed by Rafael J. Wysocki
parent abe98ec2d8
commit 91ff4cb803
5 changed files with 394 additions and 2 deletions
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9
include/linux/pm.h
View file

@ -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);