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authorZhonghui Fu <zhonghui.fu@linux.intel.com>2015-03-18 15:54:27 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-03-18 15:54:27 +0100
commit431d452af13720463dda498999b2e9a08729c03a (patch)
tree581e00b8b20d6fbc60df1d0d0c4390141abe1f4f
parent1d4a9c17d4d204a159139361e8d4db7f9f267879 (diff)
PM / sleep: add pm-trace support for suspending phase
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 <zhonghui.fu@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--arch/x86/include/asm/pm-trace.h (renamed from arch/x86/include/asm/resume-trace.h)10
-rw-r--r--drivers/base/power/main.c20
-rw-r--r--drivers/base/power/trace.c6
-rw-r--r--include/linux/pm-trace.h (renamed from include/linux/resume-trace.h)9
-rw-r--r--kernel/power/main.c2
5 files changed, 31 insertions, 16 deletions
diff --git a/arch/x86/include/asm/resume-trace.h b/arch/x86/include/asm/pm-trace.h
index 3ff1c2cb1da5..7b7ac42c3661 100644
--- a/arch/x86/include/asm/resume-trace.h
+++ b/arch/x86/include/asm/pm-trace.h
@@ -1,5 +1,5 @@
-#ifndef _ASM_X86_RESUME_TRACE_H
-#define _ASM_X86_RESUME_TRACE_H
+#ifndef _ASM_X86_PM_TRACE_H
+#define _ASM_X86_PM_TRACE_H
#include <asm/asm.h>
@@ -14,8 +14,10 @@ do { \
".previous" \
:"=r" (tracedata) \
: "i" (__LINE__), "i" (__FILE__)); \
- generate_resume_trace(tracedata, user); \
+ generate_pm_trace(tracedata, user); \
} \
} while (0)
-#endif /* _ASM_X86_RESUME_TRACE_H */
+#define TRACE_SUSPEND(user) TRACE_RESUME(user)
+
+#endif /* _ASM_X86_PM_TRACE_H */
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 9717d5f20139..3d874eca7104 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -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;
diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c
index d94a1f5121cf..a311cfa4c5bd 100644
--- a/drivers/base/power/trace.c
+++ b/drivers/base/power/trace.c
@@ -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)
diff --git a/include/linux/resume-trace.h b/include/linux/pm-trace.h
index f31db2368782..ecbde7a5548e 100644
--- a/include/linux/resume-trace.h
+++ b/include/linux/pm-trace.h
@@ -1,8 +1,8 @@
-#ifndef RESUME_TRACE_H
-#define RESUME_TRACE_H
+#ifndef PM_TRACE_H
+#define PM_TRACE_H
#ifdef CONFIG_PM_TRACE
-#include <asm/resume-trace.h>
+#include <asm/pm-trace.h>
#include <linux/types.h>
extern int pm_trace_enabled;
@@ -14,7 +14,7 @@ static inline int pm_trace_is_enabled(void)
struct device;
extern void set_trace_device(struct device *);
-extern void generate_resume_trace(const void *tracedata, unsigned int user);
+extern void generate_pm_trace(const void *tracedata, unsigned int user);
extern int show_trace_dev_match(char *buf, size_t size);
#define TRACE_DEVICE(dev) do { \
@@ -28,6 +28,7 @@ static inline int pm_trace_is_enabled(void) { return 0; }
#define TRACE_DEVICE(dev) do { } while (0)
#define TRACE_RESUME(dev) do { } while (0)
+#define TRACE_SUSPEND(dev) do { } while (0)
#endif
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 9a59d042ea84..86e8157a450f 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -11,7 +11,7 @@
#include <linux/export.h>
#include <linux/kobject.h>
#include <linux/string.h>
-#include <linux/resume-trace.h>
+#include <linux/pm-trace.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>