diff options
| -rw-r--r-- | Documentation/power/pm_qos_interface.txt | 37 | ||||
| -rw-r--r-- | Documentation/trace/events-power.txt | 2 | ||||
| -rw-r--r-- | drivers/base/power/power.h | 4 | ||||
| -rw-r--r-- | drivers/base/power/qos.c | 55 | ||||
| -rw-r--r-- | drivers/base/power/sysfs.c | 32 | ||||
| -rw-r--r-- | drivers/mtd/nand/sh_flctl.c | 2 | ||||
| -rw-r--r-- | include/linux/pm_qos.h | 14 | ||||
| -rw-r--r-- | include/trace/events/power.h | 4 |
8 files changed, 73 insertions, 77 deletions
diff --git a/Documentation/power/pm_qos_interface.txt b/Documentation/power/pm_qos_interface.txt index 4836320..22cb8f5 100644 --- a/Documentation/power/pm_qos_interface.txt +++ b/Documentation/power/pm_qos_interface.txt @@ -89,16 +89,16 @@ node. 2. PM QoS per-device latency and flags framework For each device, there are two lists of PM QoS requests. One is maintained -along with the aggregated target of latency value and the other is for PM QoS -flags. Values are updated in response to changes of the request list. +along with the aggregated target of resume latency value and the other is for +PM QoS flags. Values are updated in response to changes of the request list. -Target latency value is simply the minimum of the request values held in the -parameter list elements. The PM QoS flags aggregate value is a gather (bitwise -OR) of all list elements' values. Two device PM QoS flags are defined currently: -PM_QOS_FLAG_NO_POWER_OFF and PM_QOS_FLAG_REMOTE_WAKEUP. +Target resume latency value is simply the minimum of the request values held in +the parameter list elements. The PM QoS flags aggregate value is a gather +(bitwise OR) of all list elements' values. Two device PM QoS flags are defined +currently: PM_QOS_FLAG_NO_POWER_OFF and PM_QOS_FLAG_REMOTE_WAKEUP. -Note: the aggregated target value is implemented as an atomic variable so that -reading the aggregated value does not require any locking mechanism. +Note: the aggregated target value is implemented in such a way that reading the +aggregated value does not require any locking mechanism. From kernel mode the use of this interface is the following: @@ -137,14 +137,14 @@ Add a PM QoS request for the first direct ancestor of the given device whose power.ignore_children flag is unset. int dev_pm_qos_expose_latency_limit(device, value) -Add a request to the device's PM QoS list of latency constraints and create -a sysfs attribute pm_qos_resume_latency_us under the device's power directory -allowing user space to manipulate that request. +Add a request to the device's PM QoS list of resume latency constraints and +create a sysfs attribute pm_qos_resume_latency_us under the device's power +directory allowing user space to manipulate that request. void dev_pm_qos_hide_latency_limit(device) Drop the request added by dev_pm_qos_expose_latency_limit() from the device's -PM QoS list of latency constraints and remove sysfs attribute pm_qos_resume_latency_us -from the device's power directory. +PM QoS list of resume latency constraints and remove sysfs attribute +pm_qos_resume_latency_us from the device's power directory. int dev_pm_qos_expose_flags(device, value) Add a request to the device's PM QoS list of flags and create sysfs attributes @@ -163,7 +163,7 @@ a per-device notification tree and a global notification tree. int dev_pm_qos_add_notifier(device, notifier): Adds a notification callback function for the device. The callback is called when the aggregated value of the device constraints list -is changed. +is changed (for resume latency device PM QoS only). int dev_pm_qos_remove_notifier(device, notifier): Removes the notification callback function for the device. @@ -171,14 +171,9 @@ Removes the notification callback function for the device. int dev_pm_qos_add_global_notifier(notifier): Adds a notification callback function in the global notification tree of the framework. -The callback is called when the aggregated value for any device is changed. +The callback is called when the aggregated value for any device is changed +(for resume latency device PM QoS only). int dev_pm_qos_remove_global_notifier(notifier): Removes the notification callback function from the global notification tree of the framework. - - -From user mode: -No API for user space access to the per-device latency constraints is provided -yet - still under discussion. - diff --git a/Documentation/trace/events-power.txt b/Documentation/trace/events-power.txt index 3bd33b8..21d514c 100644 --- a/Documentation/trace/events-power.txt +++ b/Documentation/trace/events-power.txt @@ -92,5 +92,5 @@ dev_pm_qos_remove_request "device=%s type=%s new_value=%d" The first parameter gives the device name which tries to add/update/remove QoS requests. -The second parameter gives the request type (e.g. "DEV_PM_QOS_LATENCY"). +The second parameter gives the request type (e.g. "DEV_PM_QOS_RESUME_LATENCY"). The third parameter is value to be added/updated/removed. diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h index cfc3226..a21223d 100644 --- a/drivers/base/power/power.h +++ b/drivers/base/power/power.h @@ -89,8 +89,8 @@ extern void dpm_sysfs_remove(struct device *dev); extern void rpm_sysfs_remove(struct device *dev); extern int wakeup_sysfs_add(struct device *dev); extern void wakeup_sysfs_remove(struct device *dev); -extern int pm_qos_sysfs_add_latency(struct device *dev); -extern void pm_qos_sysfs_remove_latency(struct device *dev); +extern int pm_qos_sysfs_add_resume_latency(struct device *dev); +extern void pm_qos_sysfs_remove_resume_latency(struct device *dev); extern int pm_qos_sysfs_add_flags(struct device *dev); extern void pm_qos_sysfs_remove_flags(struct device *dev); diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 5c1361a..67c0f42 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -105,7 +105,7 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_flags); s32 __dev_pm_qos_read_value(struct device *dev) { return IS_ERR_OR_NULL(dev->power.qos) ? - 0 : pm_qos_read_value(&dev->power.qos->latency); + 0 : pm_qos_read_value(&dev->power.qos->resume_latency); } /** @@ -141,11 +141,11 @@ static int apply_constraint(struct dev_pm_qos_request *req, int ret; switch(req->type) { - case DEV_PM_QOS_LATENCY: - ret = pm_qos_update_target(&qos->latency, &req->data.pnode, - action, value); + case DEV_PM_QOS_RESUME_LATENCY: + ret = pm_qos_update_target(&qos->resume_latency, + &req->data.pnode, action, value); if (ret) { - value = pm_qos_read_value(&qos->latency); + value = pm_qos_read_value(&qos->resume_latency); blocking_notifier_call_chain(&dev_pm_notifiers, (unsigned long)value, req); @@ -186,10 +186,10 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) } BLOCKING_INIT_NOTIFIER_HEAD(n); - c = &qos->latency; + c = &qos->resume_latency; plist_head_init(&c->list); - c->target_value = PM_QOS_DEV_LAT_DEFAULT_VALUE; - c->default_value = PM_QOS_DEV_LAT_DEFAULT_VALUE; + c->target_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE; + c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE; c->type = PM_QOS_MIN; c->notifiers = n; @@ -224,7 +224,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev) * If the device's PM QoS resume latency limit or PM QoS flags have been * exposed to user space, they have to be hidden at this point. */ - pm_qos_sysfs_remove_latency(dev); + pm_qos_sysfs_remove_resume_latency(dev); pm_qos_sysfs_remove_flags(dev); mutex_lock(&dev_pm_qos_mtx); @@ -237,7 +237,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev) goto out; /* Flush the constraints lists for the device. */ - c = &qos->latency; + c = &qos->resume_latency; plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) { /* * Update constraints list and call the notification @@ -341,7 +341,7 @@ static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req, return -ENODEV; switch(req->type) { - case DEV_PM_QOS_LATENCY: + case DEV_PM_QOS_RESUME_LATENCY: curr_value = req->data.pnode.prio; break; case DEV_PM_QOS_FLAGS: @@ -460,8 +460,8 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier) ret = dev_pm_qos_constraints_allocate(dev); if (!ret) - ret = blocking_notifier_chain_register( - dev->power.qos->latency.notifiers, notifier); + ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers, + notifier); mutex_unlock(&dev_pm_qos_mtx); return ret; @@ -487,9 +487,8 @@ int dev_pm_qos_remove_notifier(struct device *dev, /* 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->latency.notifiers, - notifier); + retval = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers, + notifier); mutex_unlock(&dev_pm_qos_mtx); return retval; @@ -543,7 +542,7 @@ int dev_pm_qos_add_ancestor_request(struct device *dev, if (ancestor) ret = dev_pm_qos_add_request(ancestor, req, - DEV_PM_QOS_LATENCY, value); + DEV_PM_QOS_RESUME_LATENCY, value); if (ret < 0) req->dev = NULL; @@ -559,9 +558,9 @@ static void __dev_pm_qos_drop_user_request(struct device *dev, struct dev_pm_qos_request *req = NULL; switch(type) { - case DEV_PM_QOS_LATENCY: - req = dev->power.qos->latency_req; - dev->power.qos->latency_req = NULL; + case DEV_PM_QOS_RESUME_LATENCY: + req = dev->power.qos->resume_latency_req; + dev->power.qos->resume_latency_req = NULL; break; case DEV_PM_QOS_FLAGS: req = dev->power.qos->flags_req; @@ -597,7 +596,7 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) if (!req) return -ENOMEM; - ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY, value); + ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_RESUME_LATENCY, value); if (ret < 0) { kfree(req); return ret; @@ -609,7 +608,7 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) if (IS_ERR_OR_NULL(dev->power.qos)) ret = -ENODEV; - else if (dev->power.qos->latency_req) + else if (dev->power.qos->resume_latency_req) ret = -EEXIST; if (ret < 0) { @@ -618,13 +617,13 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) mutex_unlock(&dev_pm_qos_mtx); goto out; } - dev->power.qos->latency_req = req; + dev->power.qos->resume_latency_req = req; mutex_unlock(&dev_pm_qos_mtx); - ret = pm_qos_sysfs_add_latency(dev); + ret = pm_qos_sysfs_add_resume_latency(dev); if (ret) - dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY); + dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_RESUME_LATENCY); out: mutex_unlock(&dev_pm_qos_sysfs_mtx); @@ -634,8 +633,8 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); static void __dev_pm_qos_hide_latency_limit(struct device *dev) { - if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req) - __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY); + if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->resume_latency_req) + __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_RESUME_LATENCY); } /** @@ -646,7 +645,7 @@ void dev_pm_qos_hide_latency_limit(struct device *dev) { mutex_lock(&dev_pm_qos_sysfs_mtx); - pm_qos_sysfs_remove_latency(dev); + pm_qos_sysfs_remove_resume_latency(dev); mutex_lock(&dev_pm_qos_mtx); __dev_pm_qos_hide_latency_limit(dev); diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c index 03e089a..4e24955 100644 --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -218,15 +218,16 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev, static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show, autosuspend_delay_ms_store); -static ssize_t pm_qos_latency_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t pm_qos_resume_latency_show(struct device *dev, + struct device_attribute *attr, + char *buf) { - return sprintf(buf, "%d\n", dev_pm_qos_requested_latency(dev)); + return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev)); } -static ssize_t pm_qos_latency_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t n) +static ssize_t pm_qos_resume_latency_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t n) { s32 value; int ret; @@ -237,12 +238,13 @@ static ssize_t pm_qos_latency_store(struct device *dev, if (value < 0) return -EINVAL; - ret = dev_pm_qos_update_request(dev->power.qos->latency_req, value); + ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req, + value); return ret < 0 ? ret : n; } static DEVICE_ATTR(pm_qos_resume_latency_us, 0644, - pm_qos_latency_show, pm_qos_latency_store); + pm_qos_resume_latency_show, pm_qos_resume_latency_store); static ssize_t pm_qos_no_power_off_show(struct device *dev, struct device_attribute *attr, @@ -618,15 +620,15 @@ static struct attribute_group pm_runtime_attr_group = { .attrs = runtime_attrs, }; -static struct attribute *pm_qos_latency_attrs[] = { +static struct attribute *pm_qos_resume_latency_attrs[] = { #ifdef CONFIG_PM_RUNTIME &dev_attr_pm_qos_resume_latency_us.attr, #endif /* CONFIG_PM_RUNTIME */ NULL, }; -static struct attribute_group pm_qos_latency_attr_group = { +static struct attribute_group pm_qos_resume_latency_attr_group = { .name = power_group_name, - .attrs = pm_qos_latency_attrs, + .attrs = pm_qos_resume_latency_attrs, }; static struct attribute *pm_qos_flags_attrs[] = { @@ -681,14 +683,14 @@ void wakeup_sysfs_remove(struct device *dev) sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group); } -int pm_qos_sysfs_add_latency(struct device *dev) +int pm_qos_sysfs_add_resume_latency(struct device *dev) { - return sysfs_merge_group(&dev->kobj, &pm_qos_latency_attr_group); + return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group); } -void pm_qos_sysfs_remove_latency(struct device *dev) +void pm_qos_sysfs_remove_resume_latency(struct device *dev) { - sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_attr_group); + sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group); } int pm_qos_sysfs_add_flags(struct device *dev) diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c index d72783d..c067023 100644 --- a/drivers/mtd/nand/sh_flctl.c +++ b/drivers/mtd/nand/sh_flctl.c @@ -897,7 +897,7 @@ static void flctl_select_chip(struct mtd_info *mtd, int chipnr) if (!flctl->qos_request) { ret = dev_pm_qos_add_request(&flctl->pdev->dev, &flctl->pm_qos, - DEV_PM_QOS_LATENCY, + DEV_PM_QOS_RESUME_LATENCY, 100); if (ret < 0) dev_err(&flctl->pdev->dev, diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 5a95013..88a3680 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -32,7 +32,7 @@ enum pm_qos_flags_status { #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC) #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC) #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0 -#define PM_QOS_DEV_LAT_DEFAULT_VALUE 0 +#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0 #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0) #define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1) @@ -49,7 +49,7 @@ struct pm_qos_flags_request { }; enum dev_pm_qos_req_type { - DEV_PM_QOS_LATENCY = 1, + DEV_PM_QOS_RESUME_LATENCY = 1, DEV_PM_QOS_FLAGS, }; @@ -87,9 +87,9 @@ struct pm_qos_flags { }; struct dev_pm_qos { - struct pm_qos_constraints latency; + struct pm_qos_constraints resume_latency; struct pm_qos_flags flags; - struct dev_pm_qos_request *latency_req; + struct dev_pm_qos_request *resume_latency_req; struct dev_pm_qos_request *flags_req; }; @@ -196,9 +196,9 @@ 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) +static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { - return dev->power.qos->latency_req->data.pnode.prio; + return dev->power.qos->resume_latency_req->data.pnode.prio; } static inline s32 dev_pm_qos_requested_flags(struct device *dev) @@ -215,7 +215,7 @@ 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_resume_latency(struct device *dev) { return 0; } static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; } #endif diff --git a/include/trace/events/power.h b/include/trace/events/power.h index 9e9475c..f6df986 100644 --- a/include/trace/events/power.h +++ b/include/trace/events/power.h @@ -412,8 +412,8 @@ DECLARE_EVENT_CLASS(dev_pm_qos_request, TP_printk("device=%s type=%s new_value=%d", __get_str(name), __print_symbolic(__entry->type, - { DEV_PM_QOS_LATENCY, "DEV_PM_QOS_LATENCY" }, - { DEV_PM_QOS_FLAGS, "DEV_PM_QOS_FLAGS" }), + { DEV_PM_QOS_RESUME_LATENCY, "DEV_PM_QOS_RESUME_LATENCY" }, + { DEV_PM_QOS_FLAGS, "DEV_PM_QOS_FLAGS" }), __entry->new_value) ); 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