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PM / Runtime: Add sysfs debug files
Add a few sysfs files relating to runtime power management for advanced debug purposes: runtime_enabled: is runtime PM enabled for this device? States are "enabled", "disabled", "forbidden" or a combination of the latter two. runtime_status: what state is the device in currently? E.g., it reports "suspended" for runtime-suspended devices, and "active" for active devices. NOTE: if runtime_enabled returns "disabled", the value of this file may not reflect its physical state. runtime_usage: the runtime PM usage count of a device runtime_active_kids: the runtime PM children usage count of a device, or 0 if the ignore_children flag is set. Also, CONFIG_PM_SLEEP_ADVANCED_DEBUG is not defined in any Kconfig file, so replace it with CONFIG_PM_ADVANCED_DEBUG. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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1 changed files with 62 additions and 3 deletions
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@ -5,6 +5,7 @@
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/pm_runtime.h>
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#include <asm/atomic.h>
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#include "power.h"
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/*
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@ -143,7 +144,59 @@ wake_store(struct device * dev, struct device_attribute *attr,
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static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
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#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
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#ifdef CONFIG_PM_ADVANCED_DEBUG
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#ifdef CONFIG_PM_RUNTIME
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static ssize_t rtpm_usagecount_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
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}
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static ssize_t rtpm_children_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dev->power.ignore_children ?
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0 : atomic_read(&dev->power.child_count));
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}
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static ssize_t rtpm_enabled_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
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return sprintf(buf, "disabled & forbidden\n");
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else if (dev->power.disable_depth)
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return sprintf(buf, "disabled\n");
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else if (dev->power.runtime_auto == false)
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return sprintf(buf, "forbidden\n");
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return sprintf(buf, "enabled\n");
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}
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static ssize_t rtpm_status_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (dev->power.runtime_error)
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return sprintf(buf, "error\n");
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switch (dev->power.runtime_status) {
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case RPM_SUSPENDED:
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return sprintf(buf, "suspended\n");
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case RPM_SUSPENDING:
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return sprintf(buf, "suspending\n");
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case RPM_RESUMING:
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return sprintf(buf, "resuming\n");
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case RPM_ACTIVE:
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return sprintf(buf, "active\n");
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}
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return -EIO;
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}
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static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
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static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
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static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
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static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
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#endif
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static ssize_t async_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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@ -170,15 +223,21 @@ static ssize_t async_store(struct device *dev, struct device_attribute *attr,
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}
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static DEVICE_ATTR(async, 0644, async_show, async_store);
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#endif /* CONFIG_PM_SLEEP_ADVANCED_DEBUG */
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#endif /* CONFIG_PM_ADVANCED_DEBUG */
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static struct attribute * power_attrs[] = {
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#ifdef CONFIG_PM_RUNTIME
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&dev_attr_control.attr,
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#endif
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&dev_attr_wakeup.attr,
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#ifdef CONFIG_PM_SLEEP_ADVANCED_DEBUG
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#ifdef CONFIG_PM_ADVANCED_DEBUG
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&dev_attr_async.attr,
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#ifdef CONFIG_PM_RUNTIME
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&dev_attr_runtime_usage.attr,
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&dev_attr_runtime_active_kids.attr,
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&dev_attr_runtime_status.attr,
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&dev_attr_runtime_enabled.attr,
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#endif
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#endif
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NULL,
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};
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