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Message-ID: <1301723767-16394-1-git-send-email-jiejing.zhang@freescale.com>
Date: Sat, 2 Apr 2011 13:56:07 +0800
From: Zhang Jiejing <jiejing.zhang@...escale.com>
To: <linux-kernel@...r.kernel.org>,
<linux-pm@...ts.linux-foundation.org>, <gregkh@...e.de>,
<rjw@...k.pl>
CC: <kzjeef@...il.com>
Subject: [PATCH] PM: add time sensitive debug function to suspend/resume
There was some driver is slow on suspend/resume,
but some embeded system like eReader,Cellphone
are time sensitive,this commit will report the slow
driver on suspend/resume, the default value is 500us(0.5ms)
Also, the threshold can be change by modify
'/sys/power/device_suspend_time_threshold' to change the threshold,
it is in microsecond.
The output is like:
PM: device platform:soc-audio.2 suspend too slow, takes 606.696 msecs
PM: device platform:mxc_sdc_fb.1 suspend too slow, takes 7.708 msecs
Signed-off-by: Zhang Jiejing <jiejing.zhang@...escale.com>
---
drivers/base/power/main.c | 41 +++++++++++++++++++++++++++++++++++++++--
drivers/base/power/power.h | 3 +++
kernel/power/Kconfig | 15 +++++++++++++++
kernel/power/main.c | 32 ++++++++++++++++++++++++++++++++
4 files changed, 89 insertions(+), 2 deletions(-)
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 8340497..b6bf8f1 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -178,6 +178,40 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
}
}
+#ifdef CONFIG_SUSPEND_DEVICE_TIME_DEBUG
+static void suspend_time_debug_start(ktime_t *start)
+{
+ *start = ktime_get();
+}
+
+static void suspend_time_debug_report(const char *name, struct device *dev,
+ ktime_t starttime)
+{
+ ktime_t rettime;
+ s64 usecs64;
+ int usecs;
+
+ if (!dev->driver)
+ return;
+
+ rettime = ktime_get();
+ usecs64 = ktime_to_us(ktime_sub(rettime, starttime));
+ usecs = usecs64;
+ if (usecs == 0)
+ usecs = 1;
+
+ if (device_suspend_time_threshold
+ && usecs > device_suspend_time_threshold)
+ pr_info("PM: device %s:%s %s too slow, it takes \t %ld.%03ld mses\n",
+ dev->bus->name, dev_name(dev), name,
+ usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
+}
+#else
+static void suspend_time_debug_start(ktime_t *start) {}
+static void suspend_time_debug_report(const char *name, struct device *dev,
+ ktime_t starttime) {}
+#endif /* CONFIG_SUSPEND_DEVICE_TIME_DEBUG */
+
/**
* dpm_wait - Wait for a PM operation to complete.
* @dev: Device to wait for.
@@ -214,7 +248,7 @@ static int pm_op(struct device *dev,
pm_message_t state)
{
int error = 0;
- ktime_t calltime;
+ ktime_t calltime, starttime;
calltime = initcall_debug_start(dev);
@@ -222,13 +256,17 @@ static int pm_op(struct device *dev,
#ifdef CONFIG_SUSPEND
case PM_EVENT_SUSPEND:
if (ops->suspend) {
+ suspend_time_debug_start(&starttime);
error = ops->suspend(dev);
+ suspend_time_debug_report("suspend", dev, starttime);
suspend_report_result(ops->suspend, error);
}
break;
case PM_EVENT_RESUME:
if (ops->resume) {
+ suspend_time_debug_start(&starttime);
error = ops->resume(dev);
+ suspend_time_debug_report("resume", dev, starttime);
suspend_report_result(ops->resume, error);
}
break;
@@ -405,7 +443,6 @@ static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
info ?: "", info ? " " : "", pm_verb(state.event),
usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
}
-
/*------------------------- Resume routines -------------------------*/
/**
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 698dde7..4100713 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -18,6 +18,9 @@ extern int pm_async_enabled;
/* drivers/base/power/main.c */
extern struct list_head dpm_list; /* The active device list */
+/* driver/base/power/main.c */
+extern int device_suspend_time_threshold;
+
static inline struct device *to_device(struct list_head *entry)
{
return container_of(entry, struct device, power.entry);
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 2657299..82120f4 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -81,6 +81,21 @@ config PM_TRACE_RTC
CAUTION: this option will cause your machine's real-time clock to be
set to an invalid time after a resume.
+config SUSPEND_DEVICE_TIME_DEBUG
+ bool "Warnning device suspend/resume takes too much time"
+ depends on SUSPEND && PM_DEBUG
+ default n
+ ---help---
+ This option will enable a timing function to check device
+ suspend time consumption, If the device takes more time that
+ the threshold(default 0.5 ms), it will print the device and
+ bus name on the console. You can change the threshold
+ on-the-fly by modify /sys/power/time_threshold the time unit
+ is in microsecond.
+
+ This options only for debug proprose, If in doubt, say N.
+
+
config PM_SLEEP_SMP
bool
depends on SMP
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 7b5db6a..90eee97 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -300,12 +300,44 @@ power_attr(pm_trace_dev_match);
#endif /* CONFIG_PM_TRACE */
+#ifdef CONFIG_SUSPEND_DEVICE_TIME_DEBUG
+/*
+ * threshold of device suspend time consumption in microsecond(0.5ms), the
+ * driver suspend/resume time longer than this threshold will be
+ * print to console, 0 to disable */
+int device_suspend_time_threshold = 500;
+
+static ssize_t
+device_suspend_time_threshold_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", device_suspend_time_threshold);
+}
+
+static ssize_t
+device_suspend_time_threshold_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ int val;
+ if (sscanf(buf, "%d", &val) > 0) {
+ device_suspend_time_threshold = val;
+ return n;
+ }
+ return -EINVAL;
+}
+power_attr(device_suspend_time_threshold);
+#endif
+
static struct attribute * g[] = {
&state_attr.attr,
#ifdef CONFIG_PM_TRACE
&pm_trace_attr.attr,
&pm_trace_dev_match_attr.attr,
#endif
+#ifdef CONFIG_SUSPEND_DEVICE_TIME_DEBUG
+ &device_suspend_time_threshold_attr.attr,
+#endif
#ifdef CONFIG_PM_SLEEP
&pm_async_attr.attr,
&wakeup_count_attr.attr,
--
1.7.0.4
--
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