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PM / sleep: add pm-trace support for suspending phase

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Occasionally, the system can't come back up after suspend/resume
due to problems of device suspending phase. This patch make
PM_TRACE infrastructure cover device suspending phase of
suspend/resume process, and the information in RTC can tell
developers which device suspending function make system hang.

Signed-off-by: Zhonghui Fu <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Zhonghui Fu 2015-03-18 15:54:27 +01:00 • committed by Rafael J. Wysocki
commit 431d452af1
5 changed files with 31 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

20
drivers/base/power/main.c
View file

@ -23,7 +23,7 @@
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/resume-trace.h>
#include <linux/pm-trace.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/async.h>
@ -1017,6 +1017,9 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
if (async_error)
goto Complete;
@ -1057,6 +1060,7 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
Complete:
complete_all(&dev->power.completion);
TRACE_SUSPEND(error);
return error;
}
@ -1078,7 +1082,7 @@ static int device_suspend_noirq(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
if (is_async(dev)) {
get_device(dev);
async_schedule(async_suspend_noirq, dev);
return 0;
@ -1157,6 +1161,9 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
char *info = NULL;
int error = 0;
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
__pm_runtime_disable(dev, false);
if (async_error)
@ -1198,6 +1205,7 @@ static int __device_suspend_late(struct device *dev, pm_message_t state, bool as
async_error = error;
Complete:
TRACE_SUSPEND(error);
complete_all(&dev->power.completion);
return error;
}
@ -1219,7 +1227,7 @@ static int device_suspend_late(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
if (is_async(dev)) {
get_device(dev);
async_schedule(async_suspend_late, dev);
return 0;
@ -1338,6 +1346,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
int error = 0;
DECLARE_DPM_WATCHDOG_ON_STACK(wd);
TRACE_DEVICE(dev);
TRACE_SUSPEND(0);
dpm_wait_for_children(dev, async);
if (async_error)
@ -1444,6 +1455,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
if (error)
async_error = error;
TRACE_SUSPEND(error);
return error;
}
@ -1465,7 +1477,7 @@ static int device_suspend(struct device *dev)
{
reinit_completion(&dev->power.completion);
if (pm_async_enabled && dev->power.async_suspend) {
if (is_async(dev)) {
get_device(dev);
async_schedule(async_suspend, dev);
return 0;

6
drivers/base/power/trace.c
View file

@ -7,7 +7,7 @@
* devices may be working.
*/
#include <linux/resume-trace.h>
#include <linux/pm-trace.h>
#include <linux/export.h>
#include <linux/rtc.h>
@ -154,7 +154,7 @@ EXPORT_SYMBOL(set_trace_device);
* it's not any guarantee, but it's a high _likelihood_ that
* the match is valid).
*/
void generate_resume_trace(const void *tracedata, unsigned int user)
void generate_pm_trace(const void *tracedata, unsigned int user)
{
unsigned short lineno = *(unsigned short *)tracedata;
const char *file = *(const char **)(tracedata + 2);
@ -164,7 +164,7 @@ void generate_resume_trace(const void *tracedata, unsigned int user)
file_hash_value = hash_string(lineno, file, FILEHASH);
set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
}
EXPORT_SYMBOL(generate_resume_trace);
EXPORT_SYMBOL(generate_pm_trace);
extern char __tracedata_start, __tracedata_end;
static int show_file_hash(unsigned int value)