Commit b6a1d093 authored by Thara Gopinath's avatar Thara Gopinath Committed by Rafael J. Wysocki
Browse files

PM / Domains: Extend generic power domain debugfs 



This patch extends the existing generic power domain debugfs.
Changes involve the following
- Introduce a unique debugfs entry for each generic power domain with the
  following attributes
	- current_state - Displays current state of the domain.
	- devices - Displays the devices associated with this domain.
	- sub_domains - Displays the sub power domains.
	- active_time - Displays the time the domain was in active state
			in ms.
	- total_idle_time - Displays the time the domain was in any of the idle
			states in ms.
	- idle_states - Displays the various idle states and the time
			spent in each idle state in ms.

Signed-off-by: default avatarThara Gopinath <thara.gopinath@linaro.org>
Acked-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent afece3ab

drivers/base/power/domain.c

+195 −10
Original line number Diff line number Diff line
@@ -2359,7 +2359,7 @@ exit: 
	return 0;

}



static int pm_genpd_summary_show(struct seq_file *s, void *data)

static int genpd_summary_show(struct seq_file *s, void *data)

{

	struct generic_pm_domain *genpd;

	int ret = 0;
@@ -2382,21 +2382,187 @@ static int pm_genpd_summary_show(struct seq_file *s, void *data) 
	return ret;

}



static int pm_genpd_summary_open(struct inode *inode, struct file *file)

static int genpd_status_show(struct seq_file *s, void *data)

{

	return single_open(file, pm_genpd_summary_show, NULL);

	static const char * const status_lookup[] = {

		[GPD_STATE_ACTIVE] = "on",

		[GPD_STATE_POWER_OFF] = "off"

	};



	struct generic_pm_domain *genpd = s->private;

	int ret = 0;



	ret = genpd_lock_interruptible(genpd);

	if (ret)

		return -ERESTARTSYS;



	if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))

		goto exit;



	if (genpd->status == GPD_STATE_POWER_OFF)

		seq_printf(s, "%s-%u\n", status_lookup[genpd->status],

			genpd->state_idx);

	else

		seq_printf(s, "%s\n", status_lookup[genpd->status]);

exit:

	genpd_unlock(genpd);

	return ret;

}



static const struct file_operations pm_genpd_summary_fops = {

	.open = pm_genpd_summary_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};

static int genpd_sub_domains_show(struct seq_file *s, void *data)

{

	struct generic_pm_domain *genpd = s->private;

	struct gpd_link *link;

	int ret = 0;



	ret = genpd_lock_interruptible(genpd);

	if (ret)

		return -ERESTARTSYS;



	list_for_each_entry(link, &genpd->master_links, master_node)

		seq_printf(s, "%s\n", link->slave->name);



	genpd_unlock(genpd);

	return ret;

}



static int genpd_idle_states_show(struct seq_file *s, void *data)

{

	struct generic_pm_domain *genpd = s->private;

	unsigned int i;

	int ret = 0;



	ret = genpd_lock_interruptible(genpd);

	if (ret)

		return -ERESTARTSYS;



	seq_puts(s, "State          Time Spent(ms)\n");



	for (i = 0; i < genpd->state_count; i++) {

		ktime_t delta = 0;

		s64 msecs;



		if ((genpd->status == GPD_STATE_POWER_OFF) &&

				(genpd->state_idx == i))

			delta = ktime_sub(ktime_get(), genpd->accounting_time);



		msecs = ktime_to_ms(

			ktime_add(genpd->states[i].idle_time, delta));

		seq_printf(s, "S%-13i %lld\n", i, msecs);

	}



	genpd_unlock(genpd);

	return ret;

}



static int genpd_active_time_show(struct seq_file *s, void *data)

{

	struct generic_pm_domain *genpd = s->private;

	ktime_t delta = 0;

	int ret = 0;



	ret = genpd_lock_interruptible(genpd);

	if (ret)

		return -ERESTARTSYS;



	if (genpd->status == GPD_STATE_ACTIVE)

		delta = ktime_sub(ktime_get(), genpd->accounting_time);



	seq_printf(s, "%lld ms\n", ktime_to_ms(

				ktime_add(genpd->on_time, delta)));



	genpd_unlock(genpd);

	return ret;

}



static int genpd_total_idle_time_show(struct seq_file *s, void *data)

{

	struct generic_pm_domain *genpd = s->private;

	ktime_t delta = 0, total = 0;

	unsigned int i;

	int ret = 0;



	ret = genpd_lock_interruptible(genpd);

	if (ret)

		return -ERESTARTSYS;



	for (i = 0; i < genpd->state_count; i++) {



		if ((genpd->status == GPD_STATE_POWER_OFF) &&

				(genpd->state_idx == i))

			delta = ktime_sub(ktime_get(), genpd->accounting_time);



		total = ktime_add(total, genpd->states[i].idle_time);

	}

	total = ktime_add(total, delta);



	seq_printf(s, "%lld ms\n", ktime_to_ms(total));



	genpd_unlock(genpd);

	return ret;

}





static int genpd_devices_show(struct seq_file *s, void *data)

{

	struct generic_pm_domain *genpd = s->private;

	struct pm_domain_data *pm_data;

	const char *kobj_path;

	int ret = 0;



	ret = genpd_lock_interruptible(genpd);

	if (ret)

		return -ERESTARTSYS;



	list_for_each_entry(pm_data, &genpd->dev_list, list_node) {

		kobj_path = kobject_get_path(&pm_data->dev->kobj,

				genpd_is_irq_safe(genpd) ?

				GFP_ATOMIC : GFP_KERNEL);

		if (kobj_path == NULL)

			continue;



		seq_printf(s, "%s\n", kobj_path);

		kfree(kobj_path);

	}



	genpd_unlock(genpd);

	return ret;

}



#define define_genpd_open_function(name) \

static int genpd_##name##_open(struct inode *inode, struct file *file) \

{ \

	return single_open(file, genpd_##name##_show, inode->i_private); \

}



define_genpd_open_function(summary);

define_genpd_open_function(status);

define_genpd_open_function(sub_domains);

define_genpd_open_function(idle_states);

define_genpd_open_function(active_time);

define_genpd_open_function(total_idle_time);

define_genpd_open_function(devices);



#define define_genpd_debugfs_fops(name) \

static const struct file_operations genpd_##name##_fops = { \

	.open = genpd_##name##_open, \

	.read = seq_read, \

	.llseek = seq_lseek, \

	.release = single_release, \

}



define_genpd_debugfs_fops(summary);

define_genpd_debugfs_fops(status);

define_genpd_debugfs_fops(sub_domains);

define_genpd_debugfs_fops(idle_states);

define_genpd_debugfs_fops(active_time);

define_genpd_debugfs_fops(total_idle_time);

define_genpd_debugfs_fops(devices);



static int __init pm_genpd_debug_init(void)

{

	struct dentry *d;

	struct generic_pm_domain *genpd;



	pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
@@ -2404,10 +2570,29 @@ static int __init pm_genpd_debug_init(void) 
		return -ENOMEM;



	d = debugfs_create_file("pm_genpd_summary", S_IRUGO,

			pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);

			pm_genpd_debugfs_dir, NULL, &genpd_summary_fops);

	if (!d)

		return -ENOMEM;



	list_for_each_entry(genpd, &gpd_list, gpd_list_node) {

		d = debugfs_create_dir(genpd->name, pm_genpd_debugfs_dir);

		if (!d)

			return -ENOMEM;



		debugfs_create_file("current_state", 0444,

				d, genpd, &genpd_status_fops);

		debugfs_create_file("sub_domains", 0444,

				d, genpd, &genpd_sub_domains_fops);

		debugfs_create_file("idle_states", 0444,

				d, genpd, &genpd_idle_states_fops);

		debugfs_create_file("active_time", 0444,

				d, genpd, &genpd_active_time_fops);

		debugfs_create_file("total_idle_time", 0444,

				d, genpd, &genpd_total_idle_time_fops);

		debugfs_create_file("devices", 0444,

				d, genpd, &genpd_devices_fops);

	}



	return 0;

}

late_initcall(pm_genpd_debug_init);

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