Add a new QOS request type: DEV_PM_QOS_PERFORMANCE.
This is required to support runtime performance constraints for the devices. Also allow notifiers to be registered against it, which can be used by frameworks like genpd.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- Documentation/power/pm_qos_interface.txt | 2 +- drivers/base/power/qos.c | 69 +++++++++++++++++++++++++++----- include/linux/pm_qos.h | 4 ++ 3 files changed, 63 insertions(+), 12 deletions(-)
diff --git a/Documentation/power/pm_qos_interface.txt b/Documentation/power/pm_qos_interface.txt index c7989d140428..a0a45ecbc1a8 100644 --- a/Documentation/power/pm_qos_interface.txt +++ b/Documentation/power/pm_qos_interface.txt @@ -172,7 +172,7 @@ type.
The callback is called when the aggregated value of the device constraints list is changed. Currently it only supports the notifier to be registered for resume -latency device PM QoS. +latency and performance device PM QoS.
int dev_pm_qos_remove_notifier(device, notifier, type): Removes the notification callback function for the device. diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 9adc208cf1fc..cf070468a7ca 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -163,6 +163,10 @@ static int apply_constraint(struct dev_pm_qos_request *req, req->dev->power.set_latency_tolerance(req->dev, value); } break; + case DEV_PM_QOS_PERFORMANCE: + ret = pm_qos_update_target(&qos->performance, &req->data.pnode, + action, value); + break; case DEV_PM_QOS_FLAGS: ret = pm_qos_update_flags(&qos->flags, &req->data.flr, action, value); @@ -191,12 +195,13 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) if (!qos) return -ENOMEM;
- n = kzalloc(sizeof(*n), GFP_KERNEL); + n = kzalloc(2 * sizeof(*n), GFP_KERNEL); if (!n) { kfree(qos); return -ENOMEM; } BLOCKING_INIT_NOTIFIER_HEAD(n); + BLOCKING_INIT_NOTIFIER_HEAD(n + 1);
c = &qos->resume_latency; plist_head_init(&c->list); @@ -213,6 +218,14 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) c->no_constraint_value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; c->type = PM_QOS_MIN;
+ c = &qos->performance; + plist_head_init(&c->list); + c->target_value = PM_QOS_PERFORMANCE_DEFAULT_VALUE; + c->default_value = PM_QOS_PERFORMANCE_DEFAULT_VALUE; + c->no_constraint_value = PM_QOS_PERFORMANCE_DEFAULT_VALUE; + c->type = PM_QOS_MAX; + c->notifiers = n + 1; + INIT_LIST_HEAD(&qos->flags.list);
spin_lock_irq(&dev->power.lock); @@ -271,6 +284,11 @@ void dev_pm_qos_constraints_destroy(struct device *dev) apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); memset(req, 0, sizeof(*req)); } + c = &qos->performance; + plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) { + apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); + memset(req, 0, sizeof(*req)); + } f = &qos->flags; list_for_each_entry_safe(req, tmp, &f->list, data.flr.node) { apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); @@ -382,6 +400,7 @@ static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req, switch(req->type) { case DEV_PM_QOS_RESUME_LATENCY: case DEV_PM_QOS_LATENCY_TOLERANCE: + case DEV_PM_QOS_PERFORMANCE: curr_value = req->data.pnode.prio; break; case DEV_PM_QOS_FLAGS: @@ -492,11 +511,9 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_remove_request); int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier, enum dev_pm_qos_req_type type) { + struct dev_pm_qos *qos; int ret = 0;
- if (WARN_ON(type != DEV_PM_QOS_RESUME_LATENCY)) - return -EINVAL; - mutex_lock(&dev_pm_qos_mtx);
if (IS_ERR(dev->power.qos)) @@ -504,10 +521,26 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier, else if (!dev->power.qos) ret = dev_pm_qos_constraints_allocate(dev);
- if (!ret) - ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers, + if (ret) + goto unlock; + + qos = dev->power.qos; + + switch (type) { + case DEV_PM_QOS_RESUME_LATENCY: + ret = blocking_notifier_chain_register(qos->resume_latency.notifiers, + notifier); + break; + case DEV_PM_QOS_PERFORMANCE: + ret = blocking_notifier_chain_register(qos->performance.notifiers, notifier); + break; + default: + WARN_ON(1); + ret = -EINVAL; + }
+unlock: mutex_unlock(&dev_pm_qos_mtx); return ret; } @@ -528,18 +561,32 @@ int dev_pm_qos_remove_notifier(struct device *dev, struct notifier_block *notifier, enum dev_pm_qos_req_type type) { + struct dev_pm_qos *qos; int retval = 0;
- if (WARN_ON(type != DEV_PM_QOS_RESUME_LATENCY)) - return -EINVAL; - mutex_lock(&dev_pm_qos_mtx);
+ qos = dev->power.qos; + /* Silently return if the constraints object is not present. */ - if (!IS_ERR_OR_NULL(dev->power.qos)) - retval = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers, + if (IS_ERR_OR_NULL(qos)) + goto unlock; + + switch (type) { + case DEV_PM_QOS_RESUME_LATENCY: + retval = blocking_notifier_chain_unregister(qos->resume_latency.notifiers, + notifier); + break; + case DEV_PM_QOS_PERFORMANCE: + retval = blocking_notifier_chain_unregister(qos->performance.notifiers, notifier); + break; + default: + WARN_ON(1); + retval = -EINVAL; + }
+unlock: mutex_unlock(&dev_pm_qos_mtx); return retval; } diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 3b24f7d20299..42733f572d86 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -37,6 +37,7 @@ enum pm_qos_flags_status { #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0 #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0 #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1) +#define PM_QOS_PERFORMANCE_DEFAULT_VALUE 0 #define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1))
#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0) @@ -56,6 +57,7 @@ struct pm_qos_flags_request { enum dev_pm_qos_req_type { DEV_PM_QOS_RESUME_LATENCY = 1, DEV_PM_QOS_LATENCY_TOLERANCE, + DEV_PM_QOS_PERFORMANCE, DEV_PM_QOS_FLAGS, };
@@ -97,9 +99,11 @@ struct pm_qos_flags { struct dev_pm_qos { struct pm_qos_constraints resume_latency; struct pm_qos_constraints latency_tolerance; + struct pm_qos_constraints performance; struct pm_qos_flags flags; struct dev_pm_qos_request *resume_latency_req; struct dev_pm_qos_request *latency_tolerance_req; + struct dev_pm_qos_request *performance_req; struct dev_pm_qos_request *flags_req; };