jean.pihet@xxxxxxxxxxxxxx writes: > From: Jean Pihet <j-pihet@xxxxxx> > > High level implementation: > > 1. Preparation of the PM QoS for the addition of a device PM QoS constraints > framework: > . rename and move of the PM QoS implementation files to kernel/power/qos.c > and include/linux/pm_qos.h > . rename of API parameters and internal fields names > . Move around the PM QoS misc devices management code for better readability > . re-organize the internal data structs > . generalize and export the constraints management core code > > 2. Implementation of the per-device PM QoS constraints: > . create drivers/base/power/qos.c for the implementation > . create 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 > . per-device notification callbacks can be registered and called upon a > change to the aggregated constraint value > . a global mutex protects the constraints users from the data being > allocated and free'd. > > 3. add a global notification mechanism for the device constraints > . add a global notification chain that gets called upon changes to the > aggregated constraint value for any device. > . the notification callbacks are passing the full constraint request data > in order for the callees to have access to it. The current use is for the > platform low-level code to access the target device of the constraint Reviewed-by: Kevin Hilman <khilman@xxxxxx> _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
