mirror of
https://github.com/Fishwaldo/Star64_linux.git
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Merge branch 'pm-qos' into pm-for-linus
* pm-qos: PM / QoS: Update Documentation for the pm_qos and dev_pm_qos frameworks PM / QoS: Add function dev_pm_qos_read_value() (v3) PM QoS: Add global notification mechanism for device constraints PM QoS: Implement per-device PM QoS constraints PM QoS: Generalize and export constraints management code PM QoS: Reorganize data structs PM QoS: Code reorganization PM QoS: Minor clean-ups PM QoS: Move and rename the implementation files
This commit is contained in:
Rafael J. Wysocki
commit
9696cc9007
25 changed files with 927 additions and 286 deletions
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@ -9,7 +9,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
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rcupdate.o extable.o params.o posix-timers.o \
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kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
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hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
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notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \
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notifier.o ksysfs.o sched_clock.o cred.o \
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async.o range.o
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obj-y += groups.o
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@ -1,7 +1,7 @@
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ccflags-$(CONFIG_PM_DEBUG) := -DDEBUG
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obj-$(CONFIG_PM) += main.o
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obj-$(CONFIG_PM) += main.o qos.o
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obj-$(CONFIG_PM_SLEEP) += console.o
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obj-$(CONFIG_FREEZER) += process.o
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obj-$(CONFIG_SUSPEND) += suspend.o
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@ -29,7 +29,7 @@
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/*#define DEBUG*/
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#include <linux/pm_qos_params.h>
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#include <linux/pm_qos.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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@ -45,62 +45,57 @@
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#include <linux/uaccess.h>
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/*
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* locking rule: all changes to requests or notifiers lists
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* locking rule: all changes to constraints or notifiers lists
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* or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
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* held, taken with _irqsave. One lock to rule them all
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*/
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enum pm_qos_type {
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PM_QOS_MAX, /* return the largest value */
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PM_QOS_MIN /* return the smallest value */
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};
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/*
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* Note: The lockless read path depends on the CPU accessing
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* target_value atomically. Atomic access is only guaranteed on all CPU
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* types linux supports for 32 bit quantites
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*/
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struct pm_qos_object {
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struct plist_head requests;
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struct blocking_notifier_head *notifiers;
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struct pm_qos_constraints *constraints;
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struct miscdevice pm_qos_power_miscdev;
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char *name;
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s32 target_value; /* Do not change to 64 bit */
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s32 default_value;
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enum pm_qos_type type;
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};
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static DEFINE_SPINLOCK(pm_qos_lock);
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static struct pm_qos_object null_pm_qos;
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static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
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static struct pm_qos_object cpu_dma_pm_qos = {
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.requests = PLIST_HEAD_INIT(cpu_dma_pm_qos.requests),
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.notifiers = &cpu_dma_lat_notifier,
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.name = "cpu_dma_latency",
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static struct pm_qos_constraints cpu_dma_constraints = {
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.list = PLIST_HEAD_INIT(cpu_dma_constraints.list),
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.target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
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.default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
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.type = PM_QOS_MIN,
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.notifiers = &cpu_dma_lat_notifier,
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};
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static struct pm_qos_object cpu_dma_pm_qos = {
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.constraints = &cpu_dma_constraints,
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};
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static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
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static struct pm_qos_object network_lat_pm_qos = {
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.requests = PLIST_HEAD_INIT(network_lat_pm_qos.requests),
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.notifiers = &network_lat_notifier,
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.name = "network_latency",
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static struct pm_qos_constraints network_lat_constraints = {
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.list = PLIST_HEAD_INIT(network_lat_constraints.list),
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.target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
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.default_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
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.type = PM_QOS_MIN
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.type = PM_QOS_MIN,
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.notifiers = &network_lat_notifier,
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};
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static struct pm_qos_object network_lat_pm_qos = {
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.constraints = &network_lat_constraints,
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.name = "network_latency",
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};
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static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
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static struct pm_qos_object network_throughput_pm_qos = {
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.requests = PLIST_HEAD_INIT(network_throughput_pm_qos.requests),
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.notifiers = &network_throughput_notifier,
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.name = "network_throughput",
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static struct pm_qos_constraints network_tput_constraints = {
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.list = PLIST_HEAD_INIT(network_tput_constraints.list),
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.target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
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.default_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
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.type = PM_QOS_MAX,
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.notifiers = &network_throughput_notifier,
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};
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static struct pm_qos_object network_throughput_pm_qos = {
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.constraints = &network_tput_constraints,
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.name = "network_throughput",
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};
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@ -127,17 +122,17 @@ static const struct file_operations pm_qos_power_fops = {
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};
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/* unlocked internal variant */
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static inline int pm_qos_get_value(struct pm_qos_object *o)
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static inline int pm_qos_get_value(struct pm_qos_constraints *c)
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{
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if (plist_head_empty(&o->requests))
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return o->default_value;
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if (plist_head_empty(&c->list))
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return c->default_value;
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switch (o->type) {
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switch (c->type) {
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case PM_QOS_MIN:
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return plist_first(&o->requests)->prio;
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return plist_first(&c->list)->prio;
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case PM_QOS_MAX:
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return plist_last(&o->requests)->prio;
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return plist_last(&c->list)->prio;
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default:
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/* runtime check for not using enum */
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@ -145,49 +140,217 @@ static inline int pm_qos_get_value(struct pm_qos_object *o)
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}
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}
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static inline s32 pm_qos_read_value(struct pm_qos_object *o)
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s32 pm_qos_read_value(struct pm_qos_constraints *c)
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{
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return o->target_value;
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return c->target_value;
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}
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static inline void pm_qos_set_value(struct pm_qos_object *o, s32 value)
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static inline void pm_qos_set_value(struct pm_qos_constraints *c, s32 value)
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{
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o->target_value = value;
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c->target_value = value;
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}
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static void update_target(struct pm_qos_object *o, struct plist_node *node,
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int del, int value)
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/**
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* pm_qos_update_target - manages the constraints list and calls the notifiers
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* if needed
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* @c: constraints data struct
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* @node: request to add to the list, to update or to remove
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* @action: action to take on the constraints list
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* @value: value of the request to add or update
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*
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* This function returns 1 if the aggregated constraint value has changed, 0
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* otherwise.
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*/
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int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
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enum pm_qos_req_action action, int value)
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{
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unsigned long flags;
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int prev_value, curr_value;
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int prev_value, curr_value, new_value;
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spin_lock_irqsave(&pm_qos_lock, flags);
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prev_value = pm_qos_get_value(o);
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/* PM_QOS_DEFAULT_VALUE is a signal that the value is unchanged */
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if (value != PM_QOS_DEFAULT_VALUE) {
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prev_value = pm_qos_get_value(c);
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if (value == PM_QOS_DEFAULT_VALUE)
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new_value = c->default_value;
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else
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new_value = value;
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switch (action) {
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case PM_QOS_REMOVE_REQ:
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plist_del(node, &c->list);
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break;
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case PM_QOS_UPDATE_REQ:
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/*
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* to change the list, we atomically remove, reinit
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* with new value and add, then see if the extremal
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* changed
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*/
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plist_del(node, &o->requests);
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plist_node_init(node, value);
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plist_add(node, &o->requests);
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} else if (del) {
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plist_del(node, &o->requests);
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} else {
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plist_add(node, &o->requests);
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plist_del(node, &c->list);
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case PM_QOS_ADD_REQ:
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plist_node_init(node, new_value);
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plist_add(node, &c->list);
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break;
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default:
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/* no action */
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;
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}
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curr_value = pm_qos_get_value(o);
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pm_qos_set_value(o, curr_value);
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curr_value = pm_qos_get_value(c);
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pm_qos_set_value(c, curr_value);
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spin_unlock_irqrestore(&pm_qos_lock, flags);
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if (prev_value != curr_value)
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blocking_notifier_call_chain(o->notifiers,
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if (prev_value != curr_value) {
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blocking_notifier_call_chain(c->notifiers,
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(unsigned long)curr_value,
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NULL);
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return 1;
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} else {
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return 0;
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}
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}
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/**
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* pm_qos_request - returns current system wide qos expectation
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* @pm_qos_class: identification of which qos value is requested
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*
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* This function returns the current target value.
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*/
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int pm_qos_request(int pm_qos_class)
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{
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return pm_qos_read_value(pm_qos_array[pm_qos_class]->constraints);
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}
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EXPORT_SYMBOL_GPL(pm_qos_request);
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int pm_qos_request_active(struct pm_qos_request *req)
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{
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return req->pm_qos_class != 0;
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}
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EXPORT_SYMBOL_GPL(pm_qos_request_active);
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/**
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* pm_qos_add_request - inserts new qos request into the list
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* @req: pointer to a preallocated handle
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* @pm_qos_class: identifies which list of qos request to use
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* @value: defines the qos request
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*
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* This function inserts a new entry in the pm_qos_class list of requested qos
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* performance characteristics. It recomputes the aggregate QoS expectations
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* for the pm_qos_class of parameters and initializes the pm_qos_request
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* handle. Caller needs to save this handle for later use in updates and
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* removal.
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*/
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void pm_qos_add_request(struct pm_qos_request *req,
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int pm_qos_class, s32 value)
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{
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if (!req) /*guard against callers passing in null */
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return;
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if (pm_qos_request_active(req)) {
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WARN(1, KERN_ERR "pm_qos_add_request() called for already added request\n");
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return;
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}
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req->pm_qos_class = pm_qos_class;
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pm_qos_update_target(pm_qos_array[pm_qos_class]->constraints,
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&req->node, PM_QOS_ADD_REQ, value);
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}
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EXPORT_SYMBOL_GPL(pm_qos_add_request);
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/**
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* pm_qos_update_request - modifies an existing qos request
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* @req : handle to list element holding a pm_qos request to use
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* @value: defines the qos request
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*
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* Updates an existing qos request for the pm_qos_class of parameters along
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* with updating the target pm_qos_class value.
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*
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* Attempts are made to make this code callable on hot code paths.
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*/
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void pm_qos_update_request(struct pm_qos_request *req,
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s32 new_value)
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{
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if (!req) /*guard against callers passing in null */
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return;
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if (!pm_qos_request_active(req)) {
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WARN(1, KERN_ERR "pm_qos_update_request() called for unknown object\n");
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return;
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}
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if (new_value != req->node.prio)
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pm_qos_update_target(
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pm_qos_array[req->pm_qos_class]->constraints,
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&req->node, PM_QOS_UPDATE_REQ, new_value);
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}
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EXPORT_SYMBOL_GPL(pm_qos_update_request);
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/**
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* pm_qos_remove_request - modifies an existing qos request
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* @req: handle to request list element
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*
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* Will remove pm qos request from the list of constraints and
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* recompute the current target value for the pm_qos_class. Call this
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* on slow code paths.
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*/
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void pm_qos_remove_request(struct pm_qos_request *req)
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{
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if (!req) /*guard against callers passing in null */
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return;
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/* silent return to keep pcm code cleaner */
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if (!pm_qos_request_active(req)) {
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WARN(1, KERN_ERR "pm_qos_remove_request() called for unknown object\n");
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return;
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}
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pm_qos_update_target(pm_qos_array[req->pm_qos_class]->constraints,
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&req->node, PM_QOS_REMOVE_REQ,
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PM_QOS_DEFAULT_VALUE);
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memset(req, 0, sizeof(*req));
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}
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EXPORT_SYMBOL_GPL(pm_qos_remove_request);
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/**
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* pm_qos_add_notifier - sets notification entry for changes to target value
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* @pm_qos_class: identifies which qos target changes should be notified.
|
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* @notifier: notifier block managed by caller.
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*
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* will register the notifier into a notification chain that gets called
|
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* upon changes to the pm_qos_class target value.
|
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*/
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int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
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{
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int retval;
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|
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retval = blocking_notifier_chain_register(
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pm_qos_array[pm_qos_class]->constraints->notifiers,
|
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notifier);
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|
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return retval;
|
||||
}
|
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EXPORT_SYMBOL_GPL(pm_qos_add_notifier);
|
||||
|
||||
/**
|
||||
* pm_qos_remove_notifier - deletes notification entry from chain.
|
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* @pm_qos_class: identifies which qos target changes are notified.
|
||||
* @notifier: notifier block to be removed.
|
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*
|
||||
* will remove the notifier from the notification chain that gets called
|
||||
* upon changes to the pm_qos_class target value.
|
||||
*/
|
||||
int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
|
||||
{
|
||||
int retval;
|
||||
|
||||
retval = blocking_notifier_chain_unregister(
|
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pm_qos_array[pm_qos_class]->constraints->notifiers,
|
||||
notifier);
|
||||
|
||||
return retval;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
|
||||
|
||||
/* User space interface to PM QoS classes via misc devices */
|
||||
static int register_pm_qos_misc(struct pm_qos_object *qos)
|
||||
{
|
||||
qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR;
|
||||
|
|
@ -210,165 +373,13 @@ static int find_pm_qos_object_by_minor(int minor)
|
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return -1;
|
||||
}
|
||||
|
||||
/**
|
||||
* pm_qos_request - returns current system wide qos expectation
|
||||
* @pm_qos_class: identification of which qos value is requested
|
||||
*
|
||||
* This function returns the current target value.
|
||||
*/
|
||||
int pm_qos_request(int pm_qos_class)
|
||||
{
|
||||
return pm_qos_read_value(pm_qos_array[pm_qos_class]);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_request);
|
||||
|
||||
int pm_qos_request_active(struct pm_qos_request_list *req)
|
||||
{
|
||||
return req->pm_qos_class != 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_request_active);
|
||||
|
||||
/**
|
||||
* pm_qos_add_request - inserts new qos request into the list
|
||||
* @dep: pointer to a preallocated handle
|
||||
* @pm_qos_class: identifies which list of qos request to use
|
||||
* @value: defines the qos request
|
||||
*
|
||||
* This function inserts a new entry in the pm_qos_class list of requested qos
|
||||
* performance characteristics. It recomputes the aggregate QoS expectations
|
||||
* for the pm_qos_class of parameters and initializes the pm_qos_request_list
|
||||
* handle. Caller needs to save this handle for later use in updates and
|
||||
* removal.
|
||||
*/
|
||||
|
||||
void pm_qos_add_request(struct pm_qos_request_list *dep,
|
||||
int pm_qos_class, s32 value)
|
||||
{
|
||||
struct pm_qos_object *o = pm_qos_array[pm_qos_class];
|
||||
int new_value;
|
||||
|
||||
if (pm_qos_request_active(dep)) {
|
||||
WARN(1, KERN_ERR "pm_qos_add_request() called for already added request\n");
|
||||
return;
|
||||
}
|
||||
if (value == PM_QOS_DEFAULT_VALUE)
|
||||
new_value = o->default_value;
|
||||
else
|
||||
new_value = value;
|
||||
plist_node_init(&dep->list, new_value);
|
||||
dep->pm_qos_class = pm_qos_class;
|
||||
update_target(o, &dep->list, 0, PM_QOS_DEFAULT_VALUE);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_add_request);
|
||||
|
||||
/**
|
||||
* pm_qos_update_request - modifies an existing qos request
|
||||
* @pm_qos_req : handle to list element holding a pm_qos request to use
|
||||
* @value: defines the qos request
|
||||
*
|
||||
* Updates an existing qos request for the pm_qos_class of parameters along
|
||||
* with updating the target pm_qos_class value.
|
||||
*
|
||||
* Attempts are made to make this code callable on hot code paths.
|
||||
*/
|
||||
void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
|
||||
s32 new_value)
|
||||
{
|
||||
s32 temp;
|
||||
struct pm_qos_object *o;
|
||||
|
||||
if (!pm_qos_req) /*guard against callers passing in null */
|
||||
return;
|
||||
|
||||
if (!pm_qos_request_active(pm_qos_req)) {
|
||||
WARN(1, KERN_ERR "pm_qos_update_request() called for unknown object\n");
|
||||
return;
|
||||
}
|
||||
|
||||
o = pm_qos_array[pm_qos_req->pm_qos_class];
|
||||
|
||||
if (new_value == PM_QOS_DEFAULT_VALUE)
|
||||
temp = o->default_value;
|
||||
else
|
||||
temp = new_value;
|
||||
|
||||
if (temp != pm_qos_req->list.prio)
|
||||
update_target(o, &pm_qos_req->list, 0, temp);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_update_request);
|
||||
|
||||
/**
|
||||
* pm_qos_remove_request - modifies an existing qos request
|
||||
* @pm_qos_req: handle to request list element
|
||||
*
|
||||
* Will remove pm qos request from the list of requests and
|
||||
* recompute the current target value for the pm_qos_class. Call this
|
||||
* on slow code paths.
|
||||
*/
|
||||
void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req)
|
||||
{
|
||||
struct pm_qos_object *o;
|
||||
|
||||
if (pm_qos_req == NULL)
|
||||
return;
|
||||
/* silent return to keep pcm code cleaner */
|
||||
|
||||
if (!pm_qos_request_active(pm_qos_req)) {
|
||||
WARN(1, KERN_ERR "pm_qos_remove_request() called for unknown object\n");
|
||||
return;
|
||||
}
|
||||
|
||||
o = pm_qos_array[pm_qos_req->pm_qos_class];
|
||||
update_target(o, &pm_qos_req->list, 1, PM_QOS_DEFAULT_VALUE);
|
||||
memset(pm_qos_req, 0, sizeof(*pm_qos_req));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_remove_request);
|
||||
|
||||
/**
|
||||
* pm_qos_add_notifier - sets notification entry for changes to target value
|
||||
* @pm_qos_class: identifies which qos target changes should be notified.
|
||||
* @notifier: notifier block managed by caller.
|
||||
*
|
||||
* will register the notifier into a notification chain that gets called
|
||||
* upon changes to the pm_qos_class target value.
|
||||
*/
|
||||
int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
|
||||
{
|
||||
int retval;
|
||||
|
||||
retval = blocking_notifier_chain_register(
|
||||
pm_qos_array[pm_qos_class]->notifiers, notifier);
|
||||
|
||||
return retval;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_add_notifier);
|
||||
|
||||
/**
|
||||
* pm_qos_remove_notifier - deletes notification entry from chain.
|
||||
* @pm_qos_class: identifies which qos target changes are notified.
|
||||
* @notifier: notifier block to be removed.
|
||||
*
|
||||
* will remove the notifier from the notification chain that gets called
|
||||
* upon changes to the pm_qos_class target value.
|
||||
*/
|
||||
int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
|
||||
{
|
||||
int retval;
|
||||
|
||||
retval = blocking_notifier_chain_unregister(
|
||||
pm_qos_array[pm_qos_class]->notifiers, notifier);
|
||||
|
||||
return retval;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
|
||||
|
||||
static int pm_qos_power_open(struct inode *inode, struct file *filp)
|
||||
{
|
||||
long pm_qos_class;
|
||||
|
||||
pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
|
||||
if (pm_qos_class >= 0) {
|
||||
struct pm_qos_request_list *req = kzalloc(sizeof(*req), GFP_KERNEL);
|
||||
struct pm_qos_request *req = kzalloc(sizeof(*req), GFP_KERNEL);
|
||||
if (!req)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -383,7 +394,7 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
|
|||
|
||||
static int pm_qos_power_release(struct inode *inode, struct file *filp)
|
||||
{
|
||||
struct pm_qos_request_list *req;
|
||||
struct pm_qos_request *req;
|
||||
|
||||
req = filp->private_data;
|
||||
pm_qos_remove_request(req);
|
||||
|
|
@ -398,17 +409,15 @@ static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
|
|||
{
|
||||
s32 value;
|
||||
unsigned long flags;
|
||||
struct pm_qos_object *o;
|
||||
struct pm_qos_request_list *pm_qos_req = filp->private_data;
|
||||
struct pm_qos_request *req = filp->private_data;
|
||||
|
||||
if (!pm_qos_req)
|
||||
if (!req)
|
||||
return -EINVAL;
|
||||
if (!pm_qos_request_active(pm_qos_req))
|
||||
if (!pm_qos_request_active(req))
|
||||
return -EINVAL;
|
||||
|
||||
o = pm_qos_array[pm_qos_req->pm_qos_class];
|
||||
spin_lock_irqsave(&pm_qos_lock, flags);
|
||||
value = pm_qos_get_value(o);
|
||||
value = pm_qos_get_value(pm_qos_array[req->pm_qos_class]->constraints);
|
||||
spin_unlock_irqrestore(&pm_qos_lock, flags);
|
||||
|
||||
return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32));
|
||||
|
|
@ -418,7 +427,7 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
|
|||
size_t count, loff_t *f_pos)
|
||||
{
|
||||
s32 value;
|
||||
struct pm_qos_request_list *pm_qos_req;
|
||||
struct pm_qos_request *req;
|
||||
|
||||
if (count == sizeof(s32)) {
|
||||
if (copy_from_user(&value, buf, sizeof(s32)))
|
||||
|
|
@ -449,8 +458,8 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
|
|||
return -EINVAL;
|
||||
}
|
||||
|
||||
pm_qos_req = filp->private_data;
|
||||
pm_qos_update_request(pm_qos_req, value);
|
||||
req = filp->private_data;
|
||||
pm_qos_update_request(req, value);
|
||||
|
||||
return count;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue