Abstract genpd lock/unlock calls, in preparation for domain specific
locks added in the following patches.
Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Krzysztof Kozłowski <k.kozlowski@xxxxxxxxxxx>
Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
---
Changes since RFC v1 -
- split into two patches. This patch abstracts genpd locking
- uses function pointer, instead of runtime function determination
drivers/base/power/domain.c | 109 ++++++++++++++++++++++++++++++--------------
include/linux/pm_domain.h | 5 +-
2 files changed, 79 insertions(+), 35 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 3ddd05d..8204615 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -40,6 +40,46 @@
static LIST_HEAD(gpd_list);
static DEFINE_MUTEX(gpd_list_lock);
+struct genpd_lock_fns {
+ void (*lock)(struct generic_pm_domain *genpd);
+ void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
+ int (*lock_interruptible)(struct generic_pm_domain *genpd);
+ void (*unlock)(struct generic_pm_domain *genpd);
+};
+
+static void genpd_lock_irq(struct generic_pm_domain *genpd)
+{
+ mutex_lock(&genpd->mlock);
+}
+
+static void genpd_lock_irq_nested(struct generic_pm_domain *genpd,
+ int depth)
+{
+ mutex_lock_nested(&genpd->mlock, depth);
+}
+
+static int genpd_lock_interruptible_irq(struct generic_pm_domain *genpd)
+{
+ return mutex_lock_interruptible(&genpd->mlock);
+}
+
+static void genpd_unlock_irq(struct generic_pm_domain *genpd)
+{
+ return mutex_unlock(&genpd->mlock);
+}
+
+static struct genpd_lock_fns irq_lock = {
+ .lock = genpd_lock_irq,
+ .lock_nested = genpd_lock_irq_nested,
+ .lock_interruptible = genpd_lock_interruptible_irq,
+ .unlock = genpd_unlock_irq,
+};
+
+#define genpd_lock(p) p->lock_fns->lock(p)
+#define genpd_lock_nested(p, d) p->lock_fns->lock_nested(p, d)
+#define genpd_lock_interruptible(p) p->lock_fns->lock_interruptible(p)
+#define genpd_unlock(p) p->lock_fns->unlock(p)
+
/*
* Get the generic PM domain for a particular struct device.
* This validates the struct device pointer, the PM domain pointer,
@@ -202,9 +242,9 @@ static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
genpd_sd_counter_inc(master);
- mutex_lock_nested(&master->lock, depth + 1);
+ genpd_lock_nested(master, depth + 1);
ret = genpd_poweron(master, depth + 1);
- mutex_unlock(&master->lock);
+ genpd_unlock(master);
if (ret) {
genpd_sd_counter_dec(master);
@@ -268,9 +308,9 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
spin_unlock_irq(&dev->power.lock);
if (!IS_ERR(genpd)) {
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
genpd->max_off_time_changed = true;
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
}
dev = dev->parent;
@@ -367,9 +407,9 @@ static void genpd_power_off_work_fn(struct work_struct *work)
genpd = container_of(work, struct generic_pm_domain, power_off_work);
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
genpd_poweroff(genpd, true);
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
}
/**
@@ -439,9 +479,9 @@ static int pm_genpd_runtime_suspend(struct device *dev)
if (dev->power.irq_safe)
return 0;
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
genpd_poweroff(genpd, false);
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
return 0;
}
@@ -476,9 +516,9 @@ static int pm_genpd_runtime_resume(struct device *dev)
goto out;
}
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
ret = genpd_poweron(genpd, 0);
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
if (ret)
return ret;
@@ -692,14 +732,14 @@ static int pm_genpd_prepare(struct device *dev)
if (resume_needed(dev, genpd))
pm_runtime_resume(dev);
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
if (genpd->prepared_count++ == 0) {
genpd->suspended_count = 0;
genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
}
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
if (genpd->suspend_power_off) {
pm_runtime_put_noidle(dev);
@@ -717,12 +757,12 @@ static int pm_genpd_prepare(struct device *dev)
ret = pm_generic_prepare(dev);
if (ret) {
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
if (--genpd->prepared_count == 0)
genpd->suspend_power_off = false;
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
pm_runtime_enable(dev);
}
@@ -1080,13 +1120,13 @@ static void pm_genpd_complete(struct device *dev)
if (IS_ERR(genpd))
return;
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
run_complete = !genpd->suspend_power_off;
if (--genpd->prepared_count == 0)
genpd->suspend_power_off = false;
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
if (run_complete) {
pm_generic_complete(dev);
@@ -1260,7 +1300,7 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
if (IS_ERR(gpd_data))
return PTR_ERR(gpd_data);
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
if (genpd->prepared_count > 0) {
ret = -EAGAIN;
@@ -1277,7 +1317,7 @@ int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
out:
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
if (ret)
genpd_free_dev_data(dev, gpd_data);
@@ -1310,7 +1350,7 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
gpd_data = to_gpd_data(pdd);
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
- mutex_lock(&genpd->lock);
+ genpd_lock(genpd);
if (genpd->prepared_count > 0) {
ret = -EAGAIN;
@@ -1325,14 +1365,14 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
list_del_init(&pdd->list_node);
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
genpd_free_dev_data(dev, gpd_data);
return 0;
out:
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
return ret;
@@ -1358,8 +1398,8 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
if (!link)
return -ENOMEM;
- mutex_lock(&subdomain->lock);
- mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
+ genpd_lock(subdomain);
+ genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
if (genpd->status == GPD_STATE_POWER_OFF
&& subdomain->status != GPD_STATE_POWER_OFF) {
@@ -1382,8 +1422,8 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
genpd_sd_counter_inc(genpd);
out:
- mutex_unlock(&genpd->lock);
- mutex_unlock(&subdomain->lock);
+ genpd_unlock(genpd);
+ genpd_unlock(subdomain);
if (ret)
kfree(link);
return ret;
@@ -1404,8 +1444,8 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
return -EINVAL;
- mutex_lock(&subdomain->lock);
- mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
+ genpd_lock(subdomain);
+ genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
if (!list_empty(&subdomain->slave_links) || subdomain->device_count) {
pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
@@ -1429,8 +1469,8 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
}
out:
- mutex_unlock(&genpd->lock);
- mutex_unlock(&subdomain->lock);
+ genpd_unlock(genpd);
+ genpd_unlock(subdomain);
return ret;
}
@@ -1595,7 +1635,8 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
INIT_LIST_HEAD(&genpd->master_links);
INIT_LIST_HEAD(&genpd->slave_links);
INIT_LIST_HEAD(&genpd->dev_list);
- mutex_init(&genpd->lock);
+ mutex_init(&genpd->mlock);
+ genpd->lock_fns = &irq_lock;
genpd->gov = gov;
INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
atomic_set(&genpd->sd_count, 0);
@@ -1952,9 +1993,9 @@ int genpd_dev_pm_attach(struct device *dev)
dev->pm_domain->detach = genpd_dev_pm_detach;
dev->pm_domain->sync = genpd_dev_pm_sync;
- mutex_lock(&pd->lock);
+ genpd_lock(pd);
ret = genpd_poweron(pd, 0);
- mutex_unlock(&pd->lock);
+ genpd_unlock(pd);
out:
return ret ? -EPROBE_DEFER : 0;
}
@@ -2011,7 +2052,7 @@ static int pm_genpd_summary_one(struct seq_file *s,
struct gpd_link *link;
int ret;
- ret = mutex_lock_interruptible(&genpd->lock);
+ ret = genpd_lock_interruptible(genpd);
if (ret)
return -ERESTARTSYS;
@@ -2047,7 +2088,7 @@ static int pm_genpd_summary_one(struct seq_file *s,
seq_puts(s, "\n");
exit:
- mutex_unlock(&genpd->lock);
+ genpd_unlock(genpd);
return 0;
}
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 376d7fa..ec5523c 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -44,13 +44,14 @@ struct genpd_power_state {
u32 param;
};
+struct genpd_lock_fns;
+
struct generic_pm_domain {
struct dev_pm_domain domain; /* PM domain operations */
struct list_head gpd_list_node; /* Node in the global PM domains list */
struct list_head master_links; /* Links with PM domain as a master */
struct list_head slave_links; /* Links with PM domain as a slave */
struct list_head dev_list; /* List of devices */
- struct mutex lock;
struct dev_power_governor *gov;
struct work_struct power_off_work;
const char *name;
@@ -74,6 +75,8 @@ struct generic_pm_domain {
struct genpd_power_state *states;
unsigned int state_count; /* number of states */
unsigned int state_idx; /* state that genpd will go to when off */
+ struct genpd_lock_fns *lock_fns;
+ struct mutex mlock;
};
--
2.1.4
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