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PM / Domains: Allow to attach a CPU via genpd_dev_pm_attach_by_id|name()

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Attaching a device via genpd_dev_pm_attach_by_id|name() makes
genpd allocate a virtual device that it attaches instead. This
leads to a problem in case when the base device belongs to a CPU.
More precisely, it means genpd_get_cpu() compares against the
virtual device, thus it fails to find a matching CPU device.

Address this limitation by passing the base device to genpd_get_cpu()
rather than the virtual device.

Moreover, to deal with detach correctly from genpd_remove_device(),
store the CPU number in struct generic_pm_domain_data, so as to be
able to clear the corresponding bit in the cpumask for the genpd.

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>
This commit is contained in:
Ulf Hansson 2019-04-25 11:04:13 +02:00 committed by Rafael J. Wysocki
parent b24e196586
commit f9ccd7c3a1
2 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/base/power/domain.c
View File

@ -1499,10 +1499,11 @@ static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev)
return -1;
}
static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
struct device *base_dev)
{
struct generic_pm_domain_data *gpd_data;
int ret, cpu;
int ret;
dev_dbg(dev, "%s()\n", __func__);
@ -1513,7 +1514,7 @@ 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);
gpd_data->cpu = genpd_get_cpu(genpd, base_dev);
ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
if (ret)
@ -1521,7 +1522,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
genpd_lock(genpd);
genpd_set_cpumask(genpd, cpu);
genpd_set_cpumask(genpd, gpd_data->cpu);
dev_pm_domain_set(dev, &genpd->domain);
genpd->device_count++;
@ -1549,7 +1550,7 @@ int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
int ret;
mutex_lock(&gpd_list_lock);
ret = genpd_add_device(genpd, dev);
ret = genpd_add_device(genpd, dev, dev);
mutex_unlock(&gpd_list_lock);
return ret;
@ -1561,14 +1562,13 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
{
struct generic_pm_domain_data *gpd_data;
struct pm_domain_data *pdd;
int cpu, ret = 0;
int 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);
@ -1580,7 +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, cpu);
genpd_clear_cpumask(genpd, gpd_data->cpu);
dev_pm_domain_set(dev, NULL);
list_del_init(&pdd->list_node);
@ -2256,7 +2256,7 @@ int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
goto out;
}
ret = genpd_add_device(genpd, dev);
ret = genpd_add_device(genpd, dev, dev);
out:
mutex_unlock(&gpd_list_lock);
@ -2426,7 +2426,7 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
dev_dbg(dev, "adding to PM domain %s\n", pd->name);
ret = genpd_add_device(pd, dev);
ret = genpd_add_device(pd, dev, base_dev);
mutex_unlock(&gpd_list_lock);
if (ret < 0) {

1
include/linux/pm_domain.h
View File

@ -175,6 +175,7 @@ struct generic_pm_domain_data {
struct pm_domain_data base;
struct gpd_timing_data td;
struct notifier_block nb;
int cpu;
unsigned int performance_state;
void *data;
};