perf tools: Add perf_pmu__format_bits()

Add perf_pmu__format_bits() to get the format bits for a PMU config
term.  Intel PT will use this to validate terms and to record format
bits to enable later interpreting the config from the attribute stored
in the perf.data file.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1437150840-31811-15-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index b615cdf211d6..c548ec89c8bc 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -542,7 +542,7 @@ struct perf_pmu *perf_pmu__find(const char *name)
 }
 
 static struct perf_pmu_format *
-pmu_find_format(struct list_head *formats, char *name)
+pmu_find_format(struct list_head *formats, const char *name)
 {
 	struct perf_pmu_format *format;
 
@@ -553,6 +553,21 @@ pmu_find_format(struct list_head *formats, char *name)
 	return NULL;
 }
 
+__u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
+{
+	struct perf_pmu_format *format = pmu_find_format(formats, name);
+	__u64 bits = 0;
+	int fbit;
+
+	if (!format)
+		return 0;
+
+	for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
+		bits |= 1ULL << fbit;
+
+	return bits;
+}
+
 /*
  * Sets value based on the format definition (format parameter)
  * and unformated value (value parameter).