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Commit 23a6e13d authored by Sujit Reddy Thumma's avatar Sujit Reddy Thumma
Browse files

mmc: core: Add trace events to profile mmc suspend-resume 



Add trace events to capture mmc suspend-resume latencies.
This would be useful to capture latencies for variety
of MMC/SD cards and decide on best possible runtime PM timeout.

Usage -
cd /sys/kernel/debug
echo 1 > tracing/events/mmc/mmc_resume_host/enable
echo 1 > tracing/events/mmc/mmc_suspend_host/enable
cat tracing/trace_pipe

Change-Id: Ic3a73753d55985c1c663cf2972cbed320e0fcfc3
Signed-off-by: default avatarSujit Reddy Thumma <sthumma@codeaurora.org>
parent 9e79afb8

drivers/mmc/core/core.c

+6 −0
Original line number Diff line number Diff line
@@ -3593,6 +3593,7 @@ EXPORT_SYMBOL(mmc_cache_ctrl); 
int mmc_suspend_host(struct mmc_host *host)

{

	int err = 0;

	ktime_t start = ktime_get();



	if (mmc_bus_needs_resume(host))

		return 0;
@@ -3653,6 +3654,8 @@ int mmc_suspend_host(struct mmc_host *host) 
	if (!err && !mmc_card_keep_power(host))

		mmc_power_off(host);



	trace_mmc_suspend_host(mmc_hostname(host), err,

			ktime_to_us(ktime_sub(ktime_get(), start)));

	return err;

out:

	if (!(host->card && mmc_card_sdio(host->card)))
@@ -3670,6 +3673,7 @@ EXPORT_SYMBOL(mmc_suspend_host); 
int mmc_resume_host(struct mmc_host *host)

{

	int err = 0;

	ktime_t start = ktime_get();



	mmc_bus_get(host);

	if (mmc_bus_manual_resume(host)) {
@@ -3707,6 +3711,8 @@ int mmc_resume_host(struct mmc_host *host) 
	host->pm_flags &= ~MMC_PM_KEEP_POWER;

	mmc_bus_put(host);



	trace_mmc_resume_host(mmc_hostname(host), err,

			ktime_to_us(ktime_sub(ktime_get(), start)));

	return err;

}

EXPORT_SYMBOL(mmc_resume_host);

include/trace/events/mmc.h

+33 −0
Original line number Diff line number Diff line
@@ -105,6 +105,39 @@ TRACE_EVENT(mmc_clk, 
	)

);



DECLARE_EVENT_CLASS(mmc_pm_template,

	TP_PROTO(const char *dev_name, int err, s64 usecs),



	TP_ARGS(dev_name, err, usecs),



	TP_STRUCT__entry(

		__field(s64, usecs)

		__field(int, err)

		__string(dev_name, dev_name)

	),



	TP_fast_assign(

		__entry->usecs = usecs;

		__entry->err = err;

		__assign_str(dev_name, dev_name);

	),



	TP_printk(

		"took %lld usecs, %s err %d",

		__entry->usecs,

		__get_str(dev_name),

		__entry->err

	)

);



DEFINE_EVENT(mmc_pm_template, mmc_suspend_host,

	     TP_PROTO(const char *dev_name, int err, s64 usecs),

	     TP_ARGS(dev_name, err, usecs));



DEFINE_EVENT(mmc_pm_template, mmc_resume_host,

	     TP_PROTO(const char *dev_name, int err, s64 usecs),

	     TP_ARGS(dev_name, err, usecs));



#endif /* if !defined(_TRACE_MMC_H) || defined(TRACE_HEADER_MULTI_READ) */



/* This part must be outside protection */