From: Zhonghui Fu Date: Wed, 18 Mar 2015 14:54:27 +0000 (+0100) Subject: PM / sleep: add pm-trace support for suspending phase X-Git-Tag: firefly_0821_release~176^2~1977^2~2^2^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=431d452af13720463dda498999b2e9a08729c03a;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Rafael J. Wysocki --- diff --git a/arch/x86/include/asm/pm-trace.h b/arch/x86/include/asm/pm-trace.h new file mode 100644 index 000000000000..7b7ac42c3661 --- /dev/null +++ b/arch/x86/include/asm/pm-trace.h @@ -0,0 +1,23 @@ +#ifndef _ASM_X86_PM_TRACE_H +#define _ASM_X86_PM_TRACE_H + +#include + +#define TRACE_RESUME(user) \ +do { \ + if (pm_trace_enabled) { \ + const void *tracedata; \ + asm volatile(_ASM_MOV " $1f,%0\n" \ + ".section .tracedata,\"a\"\n" \ + "1:\t.word %c1\n\t" \ + _ASM_PTR " %c2\n" \ + ".previous" \ + :"=r" (tracedata) \ + : "i" (__LINE__), "i" (__FILE__)); \ + generate_pm_trace(tracedata, user); \ + } \ +} while (0) + +#define TRACE_SUSPEND(user) TRACE_RESUME(user) + +#endif /* _ASM_X86_PM_TRACE_H */ diff --git a/arch/x86/include/asm/resume-trace.h b/arch/x86/include/asm/resume-trace.h deleted file mode 100644 index 3ff1c2cb1da5..000000000000 --- a/arch/x86/include/asm/resume-trace.h +++ /dev/null @@ -1,21 +0,0 @@ -#ifndef _ASM_X86_RESUME_TRACE_H -#define _ASM_X86_RESUME_TRACE_H - -#include - -#define TRACE_RESUME(user) \ -do { \ - if (pm_trace_enabled) { \ - const void *tracedata; \ - asm volatile(_ASM_MOV " $1f,%0\n" \ - ".section .tracedata,\"a\"\n" \ - "1:\t.word %c1\n\t" \ - _ASM_PTR " %c2\n" \ - ".previous" \ - :"=r" (tracedata) \ - : "i" (__LINE__), "i" (__FILE__)); \ - generate_resume_trace(tracedata, user); \ - } \ -} while (0) - -#endif /* _ASM_X86_RESUME_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 #include #include -#include +#include #include #include #include @@ -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 +#include #include #include @@ -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/pm-trace.h b/include/linux/pm-trace.h new file mode 100644 index 000000000000..ecbde7a5548e --- /dev/null +++ b/include/linux/pm-trace.h @@ -0,0 +1,35 @@ +#ifndef PM_TRACE_H +#define PM_TRACE_H + +#ifdef CONFIG_PM_TRACE +#include +#include + +extern int pm_trace_enabled; + +static inline int pm_trace_is_enabled(void) +{ + return pm_trace_enabled; +} + +struct device; +extern void set_trace_device(struct device *); +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 { \ + if (pm_trace_enabled) \ + set_trace_device(dev); \ + } while(0) + +#else + +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 + +#endif diff --git a/include/linux/resume-trace.h b/include/linux/resume-trace.h deleted file mode 100644 index f31db2368782..000000000000 --- a/include/linux/resume-trace.h +++ /dev/null @@ -1,34 +0,0 @@ -#ifndef RESUME_TRACE_H -#define RESUME_TRACE_H - -#ifdef CONFIG_PM_TRACE -#include -#include - -extern int pm_trace_enabled; - -static inline int pm_trace_is_enabled(void) -{ - return pm_trace_enabled; -} - -struct device; -extern void set_trace_device(struct device *); -extern void generate_resume_trace(const void *tracedata, unsigned int user); -extern int show_trace_dev_match(char *buf, size_t size); - -#define TRACE_DEVICE(dev) do { \ - if (pm_trace_enabled) \ - set_trace_device(dev); \ - } while(0) - -#else - -static inline int pm_trace_is_enabled(void) { return 0; } - -#define TRACE_DEVICE(dev) do { } while (0) -#define TRACE_RESUME(dev) do { } while (0) - -#endif - -#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 #include #include -#include +#include #include #include #include