mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-24 04:34:08 +08:00
015abee404
Existing runtime PM ftrace events (`rpm_suspend`, `rpm_resume`, `rpm_return_int`) offer limited visibility into the exact timing of device runtime power state transitions, particularly when asynchronous operations are involved. When the `rpm_suspend` or `rpm_resume` functions are invoked with the `RPM_ASYNC` flag, a return value of 0 i.e., success merely indicates that the device power state request has been queued, not that the device has yet transitioned. A new ftrace event, `rpm_status`, is introduced. This event directly logs the `power.runtime_status` value of a device whenever it changes providing granular tracking of runtime power state transitions regardless of synchronous or asynchronous `rpm_suspend` / `rpm_resume` usage. Signed-off-by: Vilas Bhat <vilasbhat@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#undef TRACE_SYSTEM
|
|
#define TRACE_SYSTEM rpm
|
|
|
|
#if !defined(_TRACE_RUNTIME_POWER_H) || defined(TRACE_HEADER_MULTI_READ)
|
|
#define _TRACE_RUNTIME_POWER_H
|
|
|
|
#include <linux/ktime.h>
|
|
#include <linux/tracepoint.h>
|
|
|
|
struct device;
|
|
|
|
/*
|
|
* The rpm_internal events are used for tracing some important
|
|
* runtime pm internal functions.
|
|
*/
|
|
DECLARE_EVENT_CLASS(rpm_internal,
|
|
|
|
TP_PROTO(struct device *dev, int flags),
|
|
|
|
TP_ARGS(dev, flags),
|
|
|
|
TP_STRUCT__entry(
|
|
__string( name, dev_name(dev) )
|
|
__field( int, flags )
|
|
__field( int , usage_count )
|
|
__field( int , disable_depth )
|
|
__field( int , runtime_auto )
|
|
__field( int , request_pending )
|
|
__field( int , irq_safe )
|
|
__field( int , child_count )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__assign_str(name, dev_name(dev));
|
|
__entry->flags = flags;
|
|
__entry->usage_count = atomic_read(
|
|
&dev->power.usage_count);
|
|
__entry->disable_depth = dev->power.disable_depth;
|
|
__entry->runtime_auto = dev->power.runtime_auto;
|
|
__entry->request_pending = dev->power.request_pending;
|
|
__entry->irq_safe = dev->power.irq_safe;
|
|
__entry->child_count = atomic_read(
|
|
&dev->power.child_count);
|
|
),
|
|
|
|
TP_printk("%s flags-%x cnt-%-2d dep-%-2d auto-%-1d p-%-1d"
|
|
" irq-%-1d child-%d",
|
|
__get_str(name), __entry->flags,
|
|
__entry->usage_count,
|
|
__entry->disable_depth,
|
|
__entry->runtime_auto,
|
|
__entry->request_pending,
|
|
__entry->irq_safe,
|
|
__entry->child_count
|
|
)
|
|
);
|
|
DEFINE_EVENT(rpm_internal, rpm_suspend,
|
|
|
|
TP_PROTO(struct device *dev, int flags),
|
|
|
|
TP_ARGS(dev, flags)
|
|
);
|
|
DEFINE_EVENT(rpm_internal, rpm_resume,
|
|
|
|
TP_PROTO(struct device *dev, int flags),
|
|
|
|
TP_ARGS(dev, flags)
|
|
);
|
|
DEFINE_EVENT(rpm_internal, rpm_idle,
|
|
|
|
TP_PROTO(struct device *dev, int flags),
|
|
|
|
TP_ARGS(dev, flags)
|
|
);
|
|
DEFINE_EVENT(rpm_internal, rpm_usage,
|
|
|
|
TP_PROTO(struct device *dev, int flags),
|
|
|
|
TP_ARGS(dev, flags)
|
|
);
|
|
|
|
TRACE_EVENT(rpm_return_int,
|
|
TP_PROTO(struct device *dev, unsigned long ip, int ret),
|
|
TP_ARGS(dev, ip, ret),
|
|
|
|
TP_STRUCT__entry(
|
|
__string( name, dev_name(dev))
|
|
__field( unsigned long, ip )
|
|
__field( int, ret )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__assign_str(name, dev_name(dev));
|
|
__entry->ip = ip;
|
|
__entry->ret = ret;
|
|
),
|
|
|
|
TP_printk("%pS:%s ret=%d", (void *)__entry->ip, __get_str(name),
|
|
__entry->ret)
|
|
);
|
|
|
|
#define RPM_STATUS_STRINGS \
|
|
EM(RPM_INVALID, "RPM_INVALID") \
|
|
EM(RPM_ACTIVE, "RPM_ACTIVE") \
|
|
EM(RPM_RESUMING, "RPM_RESUMING") \
|
|
EM(RPM_SUSPENDED, "RPM_SUSPENDED") \
|
|
EMe(RPM_SUSPENDING, "RPM_SUSPENDING")
|
|
|
|
/* Enums require being exported to userspace, for user tool parsing. */
|
|
#undef EM
|
|
#undef EMe
|
|
#define EM(a, b) TRACE_DEFINE_ENUM(a);
|
|
#define EMe(a, b) TRACE_DEFINE_ENUM(a);
|
|
|
|
RPM_STATUS_STRINGS
|
|
|
|
/*
|
|
* Now redefine the EM() and EMe() macros to map the enums to the strings that
|
|
* will be printed in the output.
|
|
*/
|
|
#undef EM
|
|
#undef EMe
|
|
#define EM(a, b) { a, b },
|
|
#define EMe(a, b) { a, b }
|
|
|
|
TRACE_EVENT(rpm_status,
|
|
TP_PROTO(struct device *dev, enum rpm_status status),
|
|
TP_ARGS(dev, status),
|
|
|
|
TP_STRUCT__entry(
|
|
__string(name, dev_name(dev))
|
|
__field(int, status)
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__assign_str(name, dev_name(dev));
|
|
__entry->status = status;
|
|
),
|
|
|
|
TP_printk("%s status=%s", __get_str(name),
|
|
__print_symbolic(__entry->status, RPM_STATUS_STRINGS))
|
|
);
|
|
|
|
#endif /* _TRACE_RUNTIME_POWER_H */
|
|
|
|
/* This part must be outside protection */
|
|
#include <trace/define_trace.h>
|