[PATCH 01/47] perf: Add PERF_EVENT_IOC_ID ioctl to return event ID

From: Arnaldo Carvalho de Melo
Date: Wed Aug 07 2013 - 17:11:38 EST

From: Jiri Olsa <jolsa@xxxxxxxxxx>

The only way to get the event ID is by reading the event fd,
followed by parsing the ID value out of the returned data.

While this is ok for current read format used by perf tool,
it is not ok when we use PERF_FORMAT_GROUP format.

With this format the data are returned for the whole group
and there's no way to find out what ID belongs to our fd
(if we are not group leader event).

Adding a simple ioctl that returns event primary ID for given fd.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-v1bn5cto707jn0bon34afqr1@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
include/uapi/linux/perf_event.h | 1 +
kernel/events/core.c | 9 +++++++++
2 files changed, 10 insertions(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index efef1d3..62c25a2 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -321,6 +321,7 @@ struct perf_event_attr {
#define PERF_EVENT_IOC_PERIOD _IOW('$', 4, __u64)
#define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5)
#define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *)
+#define PERF_EVENT_IOC_ID _IOR('$', 7, u64 *)

enum perf_event_ioc_flags {
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 916cf1f..5200b60 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3568,6 +3568,15 @@ static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return perf_event_period(event, (u64 __user *)arg);

+ {
+ u64 id = primary_event_id(event);
+ if (copy_to_user((void __user *)arg, &id, sizeof(id)))
+ return -EFAULT;
+ return 0;
+ }
int ret;

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