perf evsel: Add support for enabling counters

Add support for enabling already set up counters by using an
ioctl. I share some code with the filter setup.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375490473-1503-3-git-send-email-andi@firstfloor.org
[ Fixed up 'err' variable indentation ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8f1016186d57..960394ea1e3a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -634,15 +634,15 @@ int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
         return evsel->fd != NULL ? 0 : -ENOMEM;
 }
 
-int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
-                           const char *filter)
+static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
+                          int ioc,  void *arg)
 {
         int cpu, thread;
 
         for (cpu = 0; cpu < ncpus; cpu++) {
                 for (thread = 0; thread < nthreads; thread++) {
                         int fd = FD(evsel, cpu, thread),
-                            err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
+                            err = ioctl(fd, ioc, arg);
 
                         if (err)
                                 return err;
@@ -652,6 +652,21 @@ int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
         return 0;
 }
 
+int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
+                           const char *filter)
+{
+        return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
+                                     PERF_EVENT_IOC_SET_FILTER,
+                                     (void *)filter);
+}
+
+int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+        return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
+                                     PERF_EVENT_IOC_ENABLE,
+                                     0);
+}
+
 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
 {
         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));