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: Thara Gopinath <thara.gopinath@linaro.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 431488914982e8747a1a94cc87fb4fd06fa9ada9..43fd08e50ae94d3cd56c818750fd7167e78d5efb 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -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);