>From ec9c0f24e800461361eaf8b280abe4272b00772d Mon Sep 17 00:00:00 2001 From: Zhonghui Fu <zhonghui...@linux.intel.com> Date: Mon, 9 Feb 2015 11:09:22 +0800 Subject: [PATCH] PM-Trace: add pm-trace support for suspending phase
Occasinally, 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 develpers which device suspending function make system hang. Signed-off-by: Zhonghui Fu <zhonghui...@linux.intel.com> --- arch/x86/include/asm/resume-trace.h | 2 +- drivers/base/power/main.c | 30 +++++++++++++++++++++--------- include/linux/resume-trace.h | 2 +- 3 files changed, 23 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/resume-trace.h b/arch/x86/include/asm/resume-trace.h index 3ff1c2c..0ca2215 100644 --- a/arch/x86/include/asm/resume-trace.h +++ b/arch/x86/include/asm/resume-trace.h @@ -3,7 +3,7 @@ #include <asm/asm.h> -#define TRACE_RESUME(user) \ +#define TRACE_SUSPEND_RESUME(user) \ do { \ if (pm_trace_enabled) { \ const void *tracedata; \ diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 9717d5f..d2070b5 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -477,7 +477,7 @@ static int device_resume_noirq(struct device *dev, pm_message_t state, bool asyn int error = 0; TRACE_DEVICE(dev); - TRACE_RESUME(0); + TRACE_SUSPEND_RESUME(0); if (dev->power.syscore || dev->power.direct_complete) goto Out; @@ -511,7 +511,7 @@ static int device_resume_noirq(struct device *dev, pm_message_t state, bool asyn Out: complete_all(&dev->power.completion); - TRACE_RESUME(error); + TRACE_SUSPEND_RESUME(error); return error; } @@ -606,7 +606,7 @@ static int device_resume_early(struct device *dev, pm_message_t state, bool asyn int error = 0; TRACE_DEVICE(dev); - TRACE_RESUME(0); + TRACE_SUSPEND_RESUME(0); if (dev->power.syscore || dev->power.direct_complete) goto Out; @@ -639,7 +639,7 @@ static int device_resume_early(struct device *dev, pm_message_t state, bool asyn dev->power.is_late_suspended = false; Out: - TRACE_RESUME(error); + TRACE_SUSPEND_RESUME(error); pm_runtime_enable(dev); complete_all(&dev->power.completion); @@ -735,7 +735,7 @@ static int device_resume(struct device *dev, pm_message_t state, bool async) DECLARE_DPM_WATCHDOG_ON_STACK(wd); TRACE_DEVICE(dev); - TRACE_RESUME(0); + TRACE_SUSPEND_RESUME(0); if (dev->power.syscore) goto Complete; @@ -811,7 +811,7 @@ static int device_resume(struct device *dev, pm_message_t state, bool async) Complete: complete_all(&dev->power.completion); - TRACE_RESUME(error); + TRACE_SUSPEND_RESUME(error); return error; } @@ -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_RESUME(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_RESUME(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_RESUME(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_RESUME(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_RESUME(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_RESUME(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/include/linux/resume-trace.h b/include/linux/resume-trace.h index f31db23..9080f25 100644 --- a/include/linux/resume-trace.h +++ b/include/linux/resume-trace.h @@ -27,7 +27,7 @@ extern int show_trace_dev_match(char *buf, size_t size); 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_RESUME(dev) do { } while (0) #endif -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/