PM QoS: Reorganize data structs

In preparation for the per-device constratins support, re-organize
the data strctures:
 - add a struct pm_qos_constraints which contains the constraints
 related data
 - update struct pm_qos_object contents to the PM QoS internal object
 data. Add a pointer to struct pm_qos_constraints
 - update the internal code to use the new data structs.

Signed-off-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 6b0968f..9772311 100644 (file)
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -25,6 +25,25 @@ struct pm_qos_request {
        int pm_qos_class;
 };
 
+enum pm_qos_type {
+       PM_QOS_UNITIALIZED,
+       PM_QOS_MAX,             /* return the largest value */
+       PM_QOS_MIN              /* return the smallest value */
+};
+
+/*
+ * Note: The lockless read path depends on the CPU accessing
+ * target_value atomically.  Atomic access is only guaranteed on all CPU
+ * types linux supports for 32 bit quantites
+ */
+struct pm_qos_constraints {
+       struct plist_head list;
+       s32 target_value;       /* Do not change to 64 bit */
+       s32 default_value;
+       enum pm_qos_type type;
+       struct blocking_notifier_head *notifiers;
+};
+
 #ifdef CONFIG_PM
 void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
                        s32 value);

diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 788c4cf..4a35fe5 100644 (file)
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -49,58 +49,53 @@
  * 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
  */
-enum pm_qos_type {
-       PM_QOS_MAX,             /* return the largest value */
-       PM_QOS_MIN              /* return the smallest value */
-};
-
-/*
- * Note: The lockless read path depends on the CPU accessing
- * target_value atomically.  Atomic access is only guaranteed on all CPU
- * types linux supports for 32 bit quantites
- */
 struct pm_qos_object {
-       struct plist_head constraints;
-       struct blocking_notifier_head *notifiers;
+       struct pm_qos_constraints *constraints;
        struct miscdevice pm_qos_power_miscdev;
        char *name;
-       s32 target_value;       /* Do not change to 64 bit */
-       s32 default_value;
-       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 = {
-       .constraints = PLIST_HEAD_INIT(cpu_dma_pm_qos.constraints),
-       .notifiers = &cpu_dma_lat_notifier,
-       .name = "cpu_dma_latency",
+static struct pm_qos_constraints cpu_dma_constraints = {
+       .list = PLIST_HEAD_INIT(cpu_dma_constraints.list),
        .target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
        .default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
        .type = PM_QOS_MIN,
+       .notifiers = &cpu_dma_lat_notifier,
+};
+static struct pm_qos_object cpu_dma_pm_qos = {
+       .constraints = &cpu_dma_constraints,
 };
 
 static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
-static struct pm_qos_object network_lat_pm_qos = {
-       .constraints = PLIST_HEAD_INIT(network_lat_pm_qos.constraints),
-       .notifiers = &network_lat_notifier,
-       .name = "network_latency",
+static struct pm_qos_constraints network_lat_constraints = {
+       .list = PLIST_HEAD_INIT(network_lat_constraints.list),
        .target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
        .default_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
-       .type = PM_QOS_MIN
+       .type = PM_QOS_MIN,
+       .notifiers = &network_lat_notifier,
+};
+static struct pm_qos_object network_lat_pm_qos = {
+       .constraints = &network_lat_constraints,
+       .name = "network_latency",
 };
 
 
 static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
-static struct pm_qos_object network_throughput_pm_qos = {
-       .constraints = PLIST_HEAD_INIT(network_throughput_pm_qos.constraints),
-       .notifiers = &network_throughput_notifier,
-       .name = "network_throughput",
+static struct pm_qos_constraints network_tput_constraints = {
+       .list = PLIST_HEAD_INIT(network_tput_constraints.list),
        .target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
        .default_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
        .type = PM_QOS_MAX,
+       .notifiers = &network_throughput_notifier,
+};
+static struct pm_qos_object network_throughput_pm_qos = {
+       .constraints = &network_tput_constraints,
+       .name = "network_throughput",
 };
 
 
@@ -129,15 +124,15 @@ static const struct file_operations pm_qos_power_fops = {
 /* unlocked internal variant */
 static inline int pm_qos_get_value(struct pm_qos_object *o)
 {
-       if (plist_head_empty(&o->constraints))
-               return o->default_value;
+       if (plist_head_empty(&o->constraints->list))
+               return o->constraints->default_value;
 
-       switch (o->type) {
+       switch (o->constraints->type) {
        case PM_QOS_MIN:
-               return plist_first(&o->constraints)->prio;
+               return plist_first(&o->constraints->list)->prio;
 
        case PM_QOS_MAX:
-               return plist_last(&o->constraints)->prio;
+               return plist_last(&o->constraints->list)->prio;
 
        default:
                /* runtime check for not using enum */
@@ -147,12 +142,12 @@ static inline int pm_qos_get_value(struct pm_qos_object *o)
 
 static inline s32 pm_qos_read_value(struct pm_qos_object *o)
 {
-       return o->target_value;
+       return o->constraints->target_value;
 }
 
 static inline void pm_qos_set_value(struct pm_qos_object *o, s32 value)
 {
-       o->target_value = value;
+       o->constraints->target_value = value;
 }
 
 static void update_target(struct pm_qos_object *o, struct plist_node *node,
@@ -170,20 +165,20 @@ static void update_target(struct pm_qos_object *o, struct plist_node *node,
                 * with new value and add, then see if the extremal
                 * changed
                 */
-               plist_del(node, &o->constraints);
+               plist_del(node, &o->constraints->list);
                plist_node_init(node, value);
-               plist_add(node, &o->constraints);
+               plist_add(node, &o->constraints->list);
        } else if (del) {
-               plist_del(node, &o->constraints);
+               plist_del(node, &o->constraints->list);
        } else {
-               plist_add(node, &o->constraints);
+               plist_add(node, &o->constraints->list);
        }
        curr_value = pm_qos_get_value(o);
        pm_qos_set_value(o, curr_value);
        spin_unlock_irqrestore(&pm_qos_lock, flags);
 
        if (prev_value != curr_value)
-               blocking_notifier_call_chain(o->notifiers,
+               blocking_notifier_call_chain(o->constraints->notifiers,
                                             (unsigned long)curr_value,
                                             NULL);
 }
@@ -230,7 +225,7 @@ void pm_qos_add_request(struct pm_qos_request *req,
                return;
        }
        if (value == PM_QOS_DEFAULT_VALUE)
-               new_value = o->default_value;
+               new_value = o->constraints->default_value;
        else
                new_value = value;
        plist_node_init(&req->node, new_value);
@@ -266,7 +261,7 @@ void pm_qos_update_request(struct pm_qos_request *req,
        o = pm_qos_array[req->pm_qos_class];
 
        if (new_value == PM_QOS_DEFAULT_VALUE)
-               temp = o->default_value;
+               temp = o->constraints->default_value;
        else
                temp = new_value;
 
@@ -315,7 +310,8 @@ 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);
+                       pm_qos_array[pm_qos_class]->constraints->notifiers,
+                       notifier);
 
        return retval;
 }
@@ -334,7 +330,8 @@ 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);
+                       pm_qos_array[pm_qos_class]->constraints->notifiers,
+                       notifier);
 
        return retval;
 }