* or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
* held, taken with _irqsave. One lock to rule them all
*/
-struct pm_qos_request_list {
- struct list_head list;
- union {
- s32 value;
- s32 usec;
- s32 kbps;
- };
- int pm_qos_class;
+enum pm_qos_type {
+ PM_QOS_MAX, /* return the largest value */
+ PM_QOS_MIN /* return the smallest value */
};
-static s32 max_compare(s32 v1, s32 v2);
-static s32 min_compare(s32 v1, s32 v2);
-
struct pm_qos_object {
- struct pm_qos_request_list requests;
+ struct plist_head requests;
struct blocking_notifier_head *notifiers;
struct miscdevice pm_qos_power_miscdev;
char *name;
s32 default_value;
- atomic_t target_value;
- s32 (*comparitor)(s32, s32);
+ enum pm_qos_type type;
};
+static DEFINE_SPINLOCK(pm_qos_lock);
+
static struct pm_qos_object null_pm_qos;
static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
static struct pm_qos_object cpu_dma_pm_qos = {
- .requests = {LIST_HEAD_INIT(cpu_dma_pm_qos.requests.list)},
+ .requests = PLIST_HEAD_INIT(cpu_dma_pm_qos.requests, pm_qos_lock),
.notifiers = &cpu_dma_lat_notifier,
.name = "cpu_dma_latency",
.default_value = 2000 * USEC_PER_SEC,
- .target_value = ATOMIC_INIT(2000 * USEC_PER_SEC),
- .comparitor = min_compare
+ .type = PM_QOS_MIN,
};
static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
static struct pm_qos_object network_lat_pm_qos = {
- .requests = {LIST_HEAD_INIT(network_lat_pm_qos.requests.list)},
+ .requests = PLIST_HEAD_INIT(network_lat_pm_qos.requests, pm_qos_lock),
.notifiers = &network_lat_notifier,
.name = "network_latency",
.default_value = 2000 * USEC_PER_SEC,
- .target_value = ATOMIC_INIT(2000 * USEC_PER_SEC),
- .comparitor = min_compare
+ .type = PM_QOS_MIN
};
static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
static struct pm_qos_object network_throughput_pm_qos = {
- .requests = {LIST_HEAD_INIT(network_throughput_pm_qos.requests.list)},
+ .requests = PLIST_HEAD_INIT(network_throughput_pm_qos.requests, pm_qos_lock),
.notifiers = &network_throughput_notifier,
.name = "network_throughput",
.default_value = 0,
- .target_value = ATOMIC_INIT(0),
- .comparitor = max_compare
+ .type = PM_QOS_MAX,
};
&network_throughput_pm_qos
};
-static DEFINE_SPINLOCK(pm_qos_lock);
-
static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos);
static int pm_qos_power_open(struct inode *inode, struct file *filp);
.release = pm_qos_power_release,
};
-/* static helper functions */
-static s32 max_compare(s32 v1, s32 v2)
+/* unlocked internal variant */
+static inline int pm_qos_get_value(struct pm_qos_object *o)
{
- return max(v1, v2);
-}
+ if (plist_head_empty(&o->requests))
+ return o->default_value;
-static s32 min_compare(s32 v1, s32 v2)
-{
- return min(v1, v2);
-}
+ switch (o->type) {
+ case PM_QOS_MIN:
+ return plist_last(&o->requests)->prio;
+ case PM_QOS_MAX:
+ return plist_first(&o->requests)->prio;
-static void update_target(int pm_qos_class)
+ default:
+ /* runtime check for not using enum */
+ BUG();
+ }
+}
+
+static void update_target(struct pm_qos_object *o, struct plist_node *node,
+ int del, int value)
{
- s32 extreme_value;
- struct pm_qos_request_list *node;
unsigned long flags;
- int call_notifier = 0;
+ int prev_value, curr_value;
spin_lock_irqsave(&pm_qos_lock, flags);
- extreme_value = pm_qos_array[pm_qos_class]->default_value;
- list_for_each_entry(node,
- &pm_qos_array[pm_qos_class]->requests.list, list) {
- extreme_value = pm_qos_array[pm_qos_class]->comparitor(
- extreme_value, node->value);
- }
- if (atomic_read(&pm_qos_array[pm_qos_class]->target_value) !=
- extreme_value) {
- call_notifier = 1;
- atomic_set(&pm_qos_array[pm_qos_class]->target_value,
- extreme_value);
- pr_debug(KERN_ERR "new target for qos %d is %d\n", pm_qos_class,
- atomic_read(&pm_qos_array[pm_qos_class]->target_value));
+ prev_value = pm_qos_get_value(o);
+ /* PM_QOS_DEFAULT_VALUE is a signal that the value is unchanged */
+ if (value != PM_QOS_DEFAULT_VALUE) {
+ /*
+ * to change the list, we atomically remove, reinit
+ * with new value and add, then see if the extremal
+ * changed
+ */
+ plist_del(node, &o->requests);
+ plist_node_init(node, value);
+ plist_add(node, &o->requests);
+ } else if (del) {
+ plist_del(node, &o->requests);
+ } else {
+ plist_add(node, &o->requests);
}
+ curr_value = pm_qos_get_value(o);
spin_unlock_irqrestore(&pm_qos_lock, flags);
- if (call_notifier)
- blocking_notifier_call_chain(
- pm_qos_array[pm_qos_class]->notifiers,
- (unsigned long) extreme_value, NULL);
+ if (prev_value != curr_value)
+ blocking_notifier_call_chain(o->notifiers,
+ (unsigned long)curr_value,
+ NULL);
}
static int register_pm_qos_misc(struct pm_qos_object *qos)
*/
int pm_qos_request(int pm_qos_class)
{
- return atomic_read(&pm_qos_array[pm_qos_class]->target_value);
+ unsigned long flags;
+ int value;
+
+ spin_lock_irqsave(&pm_qos_lock, flags);
+ value = pm_qos_get_value(pm_qos_array[pm_qos_class]);
+ spin_unlock_irqrestore(&pm_qos_lock, flags);
+
+ return value;
}
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
* @pm_qos_class: identifies which list of qos request to us
* element as a handle for use in updating and removal. Call needs to save
* this handle for later use.
*/
-struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value)
+void pm_qos_add_request(struct pm_qos_request_list *dep,
+ int pm_qos_class, s32 value)
{
- struct pm_qos_request_list *dep;
- unsigned long flags;
+ struct pm_qos_object *o = pm_qos_array[pm_qos_class];
+ int new_value;
- dep = kzalloc(sizeof(struct pm_qos_request_list), GFP_KERNEL);
- if (dep) {
- if (value == PM_QOS_DEFAULT_VALUE)
- dep->value = pm_qos_array[pm_qos_class]->default_value;
- else
- dep->value = value;
- dep->pm_qos_class = pm_qos_class;
-
- spin_lock_irqsave(&pm_qos_lock, flags);
- list_add(&dep->list,
- &pm_qos_array[pm_qos_class]->requests.list);
- spin_unlock_irqrestore(&pm_qos_lock, flags);
- update_target(pm_qos_class);
+ if (pm_qos_request_active(dep)) {
+ WARN(1, KERN_ERR "pm_qos_add_request() called for already added request\n");
+ return;
}
-
- return dep;
+ 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);
* 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 new_value)
{
- unsigned long flags;
- int pending_update = 0;
s32 temp;
+ struct pm_qos_object *o;
+
+ if (!pm_qos_req) /*guard against callers passing in null */
+ return;
- if (pm_qos_req) { /*guard against callers passing in null */
- spin_lock_irqsave(&pm_qos_lock, flags);
- if (new_value == PM_QOS_DEFAULT_VALUE)
- temp = pm_qos_array[pm_qos_req->pm_qos_class]->default_value;
- else
- temp = new_value;
-
- if (temp != pm_qos_req->value) {
- pending_update = 1;
- pm_qos_req->value = temp;
- }
- spin_unlock_irqrestore(&pm_qos_lock, flags);
- if (pending_update)
- update_target(pm_qos_req->pm_qos_class);
+ 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);
*/
void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req)
{
- unsigned long flags;
- int qos_class;
+ struct pm_qos_object *o;
if (pm_qos_req == NULL)
return;
/* silent return to keep pcm code cleaner */
- qos_class = pm_qos_req->pm_qos_class;
- spin_lock_irqsave(&pm_qos_lock, flags);
- list_del(&pm_qos_req->list);
- kfree(pm_qos_req);
- spin_unlock_irqrestore(&pm_qos_lock, flags);
- update_target(qos_class);
+ 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_class = find_pm_qos_object_by_minor(iminor(inode));
if (pm_qos_class >= 0) {
- filp->private_data = (void *) pm_qos_add_request(pm_qos_class,
- PM_QOS_DEFAULT_VALUE);
+ struct pm_qos_request_list *req = kzalloc(GFP_KERNEL, sizeof(*req));
+ if (!req)
+ return -ENOMEM;
+
+ pm_qos_add_request(req, pm_qos_class, PM_QOS_DEFAULT_VALUE);
+ filp->private_data = req;
if (filp->private_data)
return 0;
{
struct pm_qos_request_list *req;
- req = (struct pm_qos_request_list *)filp->private_data;
+ req = filp->private_data;
pm_qos_remove_request(req);
+ kfree(req);
return 0;
}
} else
return -EINVAL;
- pm_qos_req = (struct pm_qos_request_list *)filp->private_data;
+ pm_qos_req = filp->private_data;
pm_qos_update_request(pm_qos_req, value);
return count;
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff