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authorUlf Hansson <ulf.hansson@linaro.org>2019-04-25 12:04:12 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-26 00:18:03 +0300
commitb24e196586fecafed1c3cff9b2f87c1a64138ade (patch)
tree5ee94efe0a97db0504273ccc503f66482b5120b7 /drivers/base
parenta174920d69db9be80332f535db4a8ca2e3bccf24 (diff)
downloadlinux-b24e196586fecafed1c3cff9b2f87c1a64138ade.tar.xz
PM / Domains: Search for the CPU device outside the genpd lock
While attaching/detaching a device to a PM domain (genpd) with GENPD_FLAG_CPU_DOMAIN set, genpd iterates the cpu_possible_mask to check whether or not the device corresponds to a CPU. This iteration is done while holding the genpd's lock, which is unnecessary. Avoid the locking by restructuring the corresponding code a bit. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c52
1 files changed, 27 insertions, 25 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 93298b7db408..da1c99178943 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1450,8 +1450,8 @@ static void genpd_free_dev_data(struct device *dev,
dev_pm_put_subsys_data(dev);
}
-static void __genpd_update_cpumask(struct generic_pm_domain *genpd,
- int cpu, bool set, unsigned int depth)
+static void genpd_update_cpumask(struct generic_pm_domain *genpd,
+ int cpu, bool set, unsigned int depth)
{
struct gpd_link *link;
@@ -1462,7 +1462,7 @@ static void __genpd_update_cpumask(struct generic_pm_domain *genpd,
struct generic_pm_domain *master = link->master;
genpd_lock_nested(master, depth + 1);
- __genpd_update_cpumask(master, cpu, set, depth + 1);
+ genpd_update_cpumask(master, cpu, set, depth + 1);
genpd_unlock(master);
}
@@ -1472,38 +1472,37 @@ static void __genpd_update_cpumask(struct generic_pm_domain *genpd,
cpumask_clear_cpu(cpu, genpd->cpus);
}
-static void genpd_update_cpumask(struct generic_pm_domain *genpd,
- struct device *dev, bool set)
+static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu)
+{
+ if (cpu >= 0)
+ genpd_update_cpumask(genpd, cpu, true, 0);
+}
+
+static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu)
+{
+ if (cpu >= 0)
+ genpd_update_cpumask(genpd, cpu, false, 0);
+}
+
+static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev)
{
int cpu;
if (!genpd_is_cpu_domain(genpd))
- return;
+ return -1;
for_each_possible_cpu(cpu) {
- if (get_cpu_device(cpu) == dev) {
- __genpd_update_cpumask(genpd, cpu, set, 0);
- return;
- }
+ if (get_cpu_device(cpu) == dev)
+ return cpu;
}
-}
-static void genpd_set_cpumask(struct generic_pm_domain *genpd,
- struct device *dev)
-{
- genpd_update_cpumask(genpd, dev, true);
-}
-
-static void genpd_clear_cpumask(struct generic_pm_domain *genpd,
- struct device *dev)
-{
- genpd_update_cpumask(genpd, dev, false);
+ return -1;
}
static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
{
struct generic_pm_domain_data *gpd_data;
- int ret;
+ int ret, cpu;
dev_dbg(dev, "%s()\n", __func__);
@@ -1514,13 +1513,15 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
if (IS_ERR(gpd_data))
return PTR_ERR(gpd_data);
+ cpu = genpd_get_cpu(genpd, dev);
+
ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
if (ret)
goto out;
genpd_lock(genpd);
- genpd_set_cpumask(genpd, dev);
+ genpd_set_cpumask(genpd, cpu);
dev_pm_domain_set(dev, &genpd->domain);
genpd->device_count++;
@@ -1560,13 +1561,14 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
{
struct generic_pm_domain_data *gpd_data;
struct pm_domain_data *pdd;
- int ret = 0;
+ int cpu, ret = 0;
dev_dbg(dev, "%s()\n", __func__);
pdd = dev->power.subsys_data->domain_data;
gpd_data = to_gpd_data(pdd);
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
+ cpu = genpd_get_cpu(genpd, dev);
genpd_lock(genpd);
@@ -1578,7 +1580,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
genpd->device_count--;
genpd->max_off_time_changed = true;
- genpd_clear_cpumask(genpd, dev);
+ genpd_clear_cpumask(genpd, cpu);
dev_pm_domain_set(dev, NULL);
list_del_init(&pdd->list_node);