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PM / Sleep: Separate printing suspend times from initcall_debug 

Change the behavior of the newly introduced
/sys/power/pm_print_times attribute so that its initial value
depends on initcall_debug, but setting it to 0 will cause device
suspend/resume times not to be printed, even if initcall_debug has
been set.  This way, the people who use initcall_debug for reasons
other than PM debugging will be able to switch the suspend/resume
times printing off, if need be.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki 2012-06-21 00:19:33 +02:00
parent 4b7760ba0d
commit b2df1d4f8b
5 changed files with 54 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/base/power/main.c
View File

@ -166,7 +166,7 @@ static ktime_t initcall_debug_start(struct device *dev)
{
ktime_t calltime = ktime_set(0, 0);
if (pm_print_times) {
if (pm_print_times_enabled) {
pr_info("calling %s+ @ %i, parent: %s\n",
dev_name(dev), task_pid_nr(current),
dev->parent ? dev_name(dev->parent) : "none");
@ -181,7 +181,7 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
{
ktime_t delta, rettime;
if (pm_print_times) {
if (pm_print_times_enabled) {
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),

11
drivers/base/power/power.h
View File

@ -85,14 +85,3 @@ static inline int pm_qos_sysfs_add(struct device *dev) { return 0; }
static inline void pm_qos_sysfs_remove(struct device *dev) {}
#endif
#ifdef CONFIG_PM_DEBUG
extern int pm_print_times_enabled;
#define pm_print_times (initcall_debug || pm_print_times_enabled)
#else /* CONFIG_PM_DEBUG */
#define pm_print_times initcall_debug
#endif /* CONFIG_PM_DEBUG */

6
include/linux/suspend.h
View File

@ -408,6 +408,12 @@ static inline void unlock_system_sleep(void) {}
#endif /* !CONFIG_PM_SLEEP */
#ifdef CONFIG_PM_SLEEP_DEBUG
extern bool pm_print_times_enabled;
#else
#define pm_print_times_enabled (false)
#endif
#ifdef CONFIG_PM_AUTOSLEEP
/* kernel/power/autosleep.c */

4
kernel/power/Kconfig
View File

@ -175,7 +175,7 @@ config PM_TEST_SUSPEND
You probably want to have your system's RTC driver statically
linked, ensuring that it's available when this test runs.
config CAN_PM_TRACE
config PM_SLEEP_DEBUG
def_bool y
depends on PM_DEBUG && PM_SLEEP
@ -196,7 +196,7 @@ config PM_TRACE
config PM_TRACE_RTC
bool "Suspend/resume event tracing"
depends on CAN_PM_TRACE
depends on PM_SLEEP_DEBUG
depends on X86
select PM_TRACE
---help---

76
kernel/power/main.c
View File

@ -132,38 +132,6 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
}
power_attr(pm_test);
/*
* pm_print_times: print time taken by devices to suspend and resume.
*
* show() returns whether printing of suspend and resume times is enabled.
* store() accepts 0 or 1. 0 disables printing and 1 enables it.
*/
int pm_print_times_enabled;
static ssize_t pm_print_times_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", pm_print_times_enabled);
}
static ssize_t pm_print_times_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned long val;
if (kstrtoul(buf, 10, &val))
return -EINVAL;
if (val > 1)
return -EINVAL;
pm_print_times_enabled = val;
return n;
}
power_attr(pm_print_times);
#endif /* CONFIG_PM_DEBUG */
#ifdef CONFIG_DEBUG_FS
@ -267,6 +235,47 @@ late_initcall(pm_debugfs_init);
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM_SLEEP_DEBUG
/*
* pm_print_times: print time taken by devices to suspend and resume.
*
* show() returns whether printing of suspend and resume times is enabled.
* store() accepts 0 or 1. 0 disables printing and 1 enables it.
*/
bool pm_print_times_enabled;
static ssize_t pm_print_times_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", pm_print_times_enabled);
}
static ssize_t pm_print_times_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned long val;
if (kstrtoul(buf, 10, &val))
return -EINVAL;
if (val > 1)
return -EINVAL;
pm_print_times_enabled = !!val;
return n;
}
power_attr(pm_print_times);
static inline void pm_print_times_init(void)
{
pm_print_times_enabled = !!initcall_debug;
}
#else /* !CONFIG_PP_SLEEP_DEBUG */
static inline void pm_print_times_init(void) {}
#endif /* CONFIG_PM_SLEEP_DEBUG */
struct kobject *power_kobj;
/**
@ -562,6 +571,8 @@ static struct attribute * g[] = {
#endif
#ifdef CONFIG_PM_DEBUG
&pm_test_attr.attr,
#endif
#ifdef CONFIG_PM_SLEEP_DEBUG
&pm_print_times_attr.attr,
#endif
#endif
@ -599,6 +610,7 @@ static int __init pm_init(void)
error = sysfs_create_group(power_kobj, &attr_group);
if (error)
return error;
pm_print_times_init();
return pm_autosleep_init();
}