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PM / sleep: trace events for device PM callbacks 

Adds two trace events which supply the same info that initcall_debug
provides, but via ftrace instead of dmesg. The existing initcall_debug
calls require the pm_print_times_enabled var to be set (either via
sysfs or via the kernel cmd line). The new trace events provide all the
same info as the initcall_debug prints but with less overhead, and also
with coverage of device prepare and complete device callbacks.

These events replace the device_pm_report_time event (which has been
removed). device_pm_callback_start is called first and provides the device
and callback info. device_pm_callback_end is called after with the
device name and error info. The time and pid are gathered from the trace
data headers.

Signed-off-by: Todd Brandt <todd.e.brandt@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Todd E Brandt 2014-06-10 07:31:22 -07:00 committed by Rafael J. Wysocki
parent bb3632c610
commit e8bca479c3
2 changed files with 52 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/base/power/main.c
View File

@ -214,9 +214,6 @@ static void initcall_debug_report(struct device *dev, ktime_t calltime,
pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
error, (unsigned long long)nsecs >> 10);
}
trace_device_pm_report_time(dev, info, nsecs, pm_verb(state.event),
error);
}
/**
@ -387,7 +384,9 @@ static int dpm_run_callback(pm_callback_t cb, struct device *dev,
calltime = initcall_debug_start(dev);
pm_dev_dbg(dev, state, info);
trace_device_pm_callback_start(dev, info, state.event);
error = cb(dev);
trace_device_pm_callback_end(dev, error);
suspend_report_result(cb, error);
initcall_debug_report(dev, calltime, error, state, info);
@ -919,7 +918,9 @@ static void device_complete(struct device *dev, pm_message_t state)
if (callback) {
pm_dev_dbg(dev, state, info);
trace_device_pm_callback_start(dev, info, state.event);
callback(dev);
trace_device_pm_callback_end(dev, 0);
}
device_unlock(dev);
@ -1307,7 +1308,9 @@ static int legacy_suspend(struct device *dev, pm_message_t state,
calltime = initcall_debug_start(dev);
trace_device_pm_callback_start(dev, info, state.event);
error = cb(dev, state);
trace_device_pm_callback_end(dev, error);
suspend_report_result(cb, error);
initcall_debug_report(dev, calltime, error, state, info);
@ -1563,8 +1566,11 @@ static int device_prepare(struct device *dev, pm_message_t state)
callback = dev->driver->pm->prepare;
}
if (callback)
if (callback) {
trace_device_pm_callback_start(dev, info, state.event);
ret = callback(dev);
trace_device_pm_callback_end(dev, ret);
}
device_unlock(dev);

60
include/trace/events/power.h
View File

@ -93,6 +93,17 @@ TRACE_EVENT(pstate_sample,
#define PWR_EVENT_EXIT -1
#endif
#define pm_verb_symbolic(event) \
__print_symbolic(event, \
{ PM_EVENT_SUSPEND, "suspend" }, \
{ PM_EVENT_RESUME, "resume" }, \
{ PM_EVENT_FREEZE, "freeze" }, \
{ PM_EVENT_QUIESCE, "quiesce" }, \
{ PM_EVENT_HIBERNATE, "hibernate" }, \
{ PM_EVENT_THAW, "thaw" }, \
{ PM_EVENT_RESTORE, "restore" }, \
{ PM_EVENT_RECOVER, "recover" })
DEFINE_EVENT(cpu, cpu_frequency,
TP_PROTO(unsigned int frequency, unsigned int cpu_id),
@ -100,41 +111,54 @@ DEFINE_EVENT(cpu, cpu_frequency,
TP_ARGS(frequency, cpu_id)
);
TRACE_EVENT(device_pm_report_time,
TRACE_EVENT(device_pm_callback_start,
TP_PROTO(struct device *dev, const char *pm_ops, s64 ops_time,
char *pm_event_str, int error),
TP_PROTO(struct device *dev, const char *pm_ops, int event),
TP_ARGS(dev, pm_ops, ops_time, pm_event_str, error),
TP_ARGS(dev, pm_ops, event),
TP_STRUCT__entry(
__string(device, dev_name(dev))
__string(driver, dev_driver_string(dev))
__string(parent, dev->parent ? dev_name(dev->parent) : "none")
__string(pm_ops, pm_ops ? pm_ops : "none ")
__string(pm_event_str, pm_event_str)
__field(s64, ops_time)
__field(int, event)
),
TP_fast_assign(
__assign_str(device, dev_name(dev));
__assign_str(driver, dev_driver_string(dev));
__assign_str(parent,
dev->parent ? dev_name(dev->parent) : "none");
__assign_str(pm_ops, pm_ops ? pm_ops : "none ");
__entry->event = event;
),
TP_printk("%s %s, parent: %s, %s[%s]", __get_str(driver),
__get_str(device), __get_str(parent), __get_str(pm_ops),
pm_verb_symbolic(__entry->event))
);
TRACE_EVENT(device_pm_callback_end,
TP_PROTO(struct device *dev, int error),
TP_ARGS(dev, error),
TP_STRUCT__entry(
__string(device, dev_name(dev))
__string(driver, dev_driver_string(dev))
__field(int, error)
),
TP_fast_assign(
const char *tmp = dev->parent ? dev_name(dev->parent) : "none";
const char *tmp_i = pm_ops ? pm_ops : "none ";
__assign_str(device, dev_name(dev));
__assign_str(driver, dev_driver_string(dev));
__assign_str(parent, tmp);
__assign_str(pm_ops, tmp_i);
__assign_str(pm_event_str, pm_event_str);
__entry->ops_time = ops_time;
__entry->error = error;
),
/* ops_str has an extra space at the end */
TP_printk("%s %s parent=%s state=%s ops=%snsecs=%lld err=%d",
__get_str(driver), __get_str(device), __get_str(parent),
__get_str(pm_event_str), __get_str(pm_ops),
__entry->ops_time, __entry->error)
TP_printk("%s %s, err=%d",
__get_str(driver), __get_str(device), __entry->error)
);
TRACE_EVENT(suspend_resume,