diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/power/domain.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index a3d41a883d83..cd400575ee0e 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -2222,3 +2222,160 @@ int genpd_dev_pm_attach(struct device *dev) } EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); #endif + + +/*** debugfs support ***/ + +#ifdef CONFIG_PM_ADVANCED_DEBUG +#include <linux/pm.h> +#include <linux/device.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/init.h> +#include <linux/kobject.h> +static struct dentry *pm_genpd_debugfs_dir; + +/* + * TODO: This function is a slightly modified version of rtpm_status_show + * from sysfs.c, but dependencies between PM_GENERIC_DOMAINS and PM_RUNTIME + * are too loose to generalize it. + */ +#ifdef CONFIG_PM_RUNTIME +static void rtpm_status_str(struct seq_file *s, struct device *dev) +{ + static const char * const status_lookup[] = { + [RPM_ACTIVE] = "active", + [RPM_RESUMING] = "resuming", + [RPM_SUSPENDED] = "suspended", + [RPM_SUSPENDING] = "suspending" + }; + const char *p = ""; + + if (dev->power.runtime_error) + p = "error"; + else if (dev->power.disable_depth) + p = "unsupported"; + else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) + p = status_lookup[dev->power.runtime_status]; + else + WARN_ON(1); + + seq_puts(s, p); +} +#else +static void rtpm_status_str(struct seq_file *s, struct device *dev) +{ + seq_puts(s, "active"); +} +#endif + +static int pm_genpd_summary_one(struct seq_file *s, + struct generic_pm_domain *gpd) +{ + static const char * const status_lookup[] = { + [GPD_STATE_ACTIVE] = "on", + [GPD_STATE_WAIT_MASTER] = "wait-master", + [GPD_STATE_BUSY] = "busy", + [GPD_STATE_REPEAT] = "off-in-progress", + [GPD_STATE_POWER_OFF] = "off" + }; + struct pm_domain_data *pm_data; + const char *kobj_path; + struct gpd_link *link; + int ret; + + ret = mutex_lock_interruptible(&gpd->lock); + if (ret) + return -ERESTARTSYS; + + if (WARN_ON(gpd->status >= ARRAY_SIZE(status_lookup))) + goto exit; + seq_printf(s, "%-30s %-15s ", gpd->name, status_lookup[gpd->status]); + + /* + * Modifications on the list require holding locks on both + * master and slave, so we are safe. + * Also gpd->name is immutable. + */ + list_for_each_entry(link, &gpd->master_links, master_node) { + seq_printf(s, "%s", link->slave->name); + if (!list_is_last(&link->master_node, &gpd->master_links)) + seq_puts(s, ", "); + } + + list_for_each_entry(pm_data, &gpd->dev_list, list_node) { + kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); + if (kobj_path == NULL) + continue; + + seq_printf(s, "\n %-50s ", kobj_path); + rtpm_status_str(s, pm_data->dev); + kfree(kobj_path); + } + + seq_puts(s, "\n"); +exit: + mutex_unlock(&gpd->lock); + + return 0; +} + +static int pm_genpd_summary_show(struct seq_file *s, void *data) +{ + struct generic_pm_domain *gpd; + int ret = 0; + + seq_puts(s, " domain status slaves\n"); + seq_puts(s, " /device runtime status\n"); + seq_puts(s, "----------------------------------------------------------------------\n"); + + ret = mutex_lock_interruptible(&gpd_list_lock); + if (ret) + return -ERESTARTSYS; + + list_for_each_entry(gpd, &gpd_list, gpd_list_node) { + ret = pm_genpd_summary_one(s, gpd); + if (ret) + break; + } + mutex_unlock(&gpd_list_lock); + + return ret; +} + +static int pm_genpd_summary_open(struct inode *inode, struct file *file) +{ + return single_open(file, pm_genpd_summary_show, NULL); +} + +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 __init pm_genpd_debug_init(void) +{ + struct dentry *d; + + pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); + + if (!pm_genpd_debugfs_dir) + return -ENOMEM; + + d = debugfs_create_file("pm_genpd_summary", S_IRUGO, + pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); + if (!d) + return -ENOMEM; + + return 0; +} +late_initcall(pm_genpd_debug_init); + +static void __exit pm_genpd_debug_exit(void) +{ + debugfs_remove_recursive(pm_genpd_debugfs_dir); +} +__exitcall(pm_genpd_debug_exit); +#endif /* CONFIG_PM_ADVANCED_DEBUG */ |