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Commit f9ccd7c3 authored by Ulf Hansson's avatar Ulf Hansson Committed by Rafael J. Wysocki
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PM / Domains: Allow to attach a CPU via genpd_dev_pm_attach_by_id|name() 



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: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent b24e1965

drivers/base/power/domain.c

+10 −10
Original line number Diff line number Diff line
@@ -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) {

include/linux/pm_domain.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

};