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Subject[PATCH 64/79] libperf: Add perf_evsel__read function
Date
Move perf_evsel__read function into libperf as a public
interface together with struct perf_counts_values for
passing the counter values to the user.

Link: http://lkml.kernel.org/n/tip-1c012lnj5ksqtgtlol3iqxx3@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/lib/evsel.c | 42 +++++++++++++++++++++++
tools/perf/lib/include/internal/evsel.h | 1 +
tools/perf/lib/include/perf/evsel.h | 14 ++++++++
tools/perf/lib/libperf.map | 1 +
tools/perf/tests/event-times.c | 2 +-
tools/perf/util/counts.h | 12 +------
tools/perf/util/evsel.c | 45 ++-----------------------
tools/perf/util/evsel.h | 3 --
8 files changed, 62 insertions(+), 58 deletions(-)

diff --git a/tools/perf/lib/evsel.c b/tools/perf/lib/evsel.c
index 50f09e939229..390fcf9107c1 100644
--- a/tools/perf/lib/evsel.c
+++ b/tools/perf/lib/evsel.c
@@ -12,6 +12,7 @@
#include <internal/xyarray.h>
#include <internal/cpumap.h>
#include <internal/threadmap.h>
+#include <internal/lib.h>
#include <linux/string.h>

void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr)
@@ -137,3 +138,44 @@ void perf_evsel__close(struct perf_evsel *evsel)
perf_evsel__close_fd(evsel);
perf_evsel__free_fd(evsel);
}
+
+int perf_evsel__read_size(struct perf_evsel *evsel)
+{
+ u64 read_format = evsel->attr.read_format;
+ int entry = sizeof(u64); /* value */
+ int size = 0;
+ int nr = 1;
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ size += sizeof(u64);
+
+ if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ size += sizeof(u64);
+
+ if (read_format & PERF_FORMAT_ID)
+ entry += sizeof(u64);
+
+ if (read_format & PERF_FORMAT_GROUP) {
+ nr = evsel->nr_members;
+ size += sizeof(u64);
+ }
+
+ size += entry * nr;
+ return size;
+}
+
+int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
+ struct perf_counts_values *count)
+{
+ size_t size = perf_evsel__read_size(evsel);
+
+ memset(count, 0, sizeof(*count));
+
+ if (FD(evsel, cpu, thread) < 0)
+ return -EINVAL;
+
+ if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
+ return -errno;
+
+ return 0;
+}
diff --git a/tools/perf/lib/include/internal/evsel.h b/tools/perf/lib/include/internal/evsel.h
index 878e2cf41ffc..89bae3720d67 100644
--- a/tools/perf/lib/include/internal/evsel.h
+++ b/tools/perf/lib/include/internal/evsel.h
@@ -23,5 +23,6 @@ struct perf_evsel {
int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
void perf_evsel__close_fd(struct perf_evsel *evsel);
void perf_evsel__free_fd(struct perf_evsel *evsel);
+int perf_evsel__read_size(struct perf_evsel *evsel);

#endif /* __LIBPERF_INTERNAL_EVSEL_H */
diff --git a/tools/perf/lib/include/perf/evsel.h b/tools/perf/lib/include/perf/evsel.h
index 41104ac662b0..9f9312dc9dfe 100644
--- a/tools/perf/lib/include/perf/evsel.h
+++ b/tools/perf/lib/include/perf/evsel.h
@@ -3,12 +3,24 @@
#define __LIBPERF_EVSEL_H

#include <linux/perf_event.h>
+#include <stdint.h>
#include <perf/core.h>

struct perf_evsel;
struct perf_cpu_map;
struct perf_thread_map;

+struct perf_counts_values {
+ union {
+ struct {
+ uint64_t val;
+ uint64_t ena;
+ uint64_t run;
+ };
+ uint64_t values[3];
+ };
+};
+
LIBPERF_API void perf_evsel__init(struct perf_evsel *evsel,
struct perf_event_attr *attr);
LIBPERF_API struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr);
@@ -16,5 +28,7 @@ LIBPERF_API void perf_evsel__delete(struct perf_evsel *evsel);
LIBPERF_API int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
struct perf_thread_map *threads);
LIBPERF_API void perf_evsel__close(struct perf_evsel *evsel);
+LIBPERF_API int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
+ struct perf_counts_values *count);

#endif /* __LIBPERF_EVSEL_H */
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
index 0b90999dcdcb..2e23cf420cce 100644
--- a/tools/perf/lib/libperf.map
+++ b/tools/perf/lib/libperf.map
@@ -16,6 +16,7 @@ LIBPERF_0.0.1 {
perf_evsel__init;
perf_evsel__open;
perf_evsel__close;
+ perf_evsel__read;
perf_evlist__new;
perf_evlist__delete;
perf_evlist__init;
diff --git a/tools/perf/tests/event-times.c b/tools/perf/tests/event-times.c
index 00adba86403b..714e3611352c 100644
--- a/tools/perf/tests/event-times.c
+++ b/tools/perf/tests/event-times.c
@@ -196,7 +196,7 @@ static int test_times(int (attach)(struct evlist *),

TEST_ASSERT_VAL("failed to detach", !detach(evlist));

- perf_evsel__read(evsel, 0, 0, &count);
+ perf_evsel__read(&evsel->core, 0, 0, &count);

err = !(count.ena == count.run);

diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
index bbfac9ecf642..13430f353c19 100644
--- a/tools/perf/util/counts.h
+++ b/tools/perf/util/counts.h
@@ -3,17 +3,7 @@
#define __PERF_COUNTS_H

#include <internal/xyarray.h>
-
-struct perf_counts_values {
- union {
- struct {
- u64 val;
- u64 ena;
- u64 run;
- };
- u64 values[3];
- };
-};
+#include <perf/evsel.h>

struct perf_counts {
s8 scaled;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8d8ed36377f5..0957ec24f518 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1346,53 +1346,12 @@ void perf_counts_values__scale(struct perf_counts_values *count,
*pscaled = scaled;
}

-static int perf_evsel__read_size(struct evsel *evsel)
-{
- u64 read_format = evsel->core.attr.read_format;
- int entry = sizeof(u64); /* value */
- int size = 0;
- int nr = 1;
-
- if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
- size += sizeof(u64);
-
- if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
- size += sizeof(u64);
-
- if (read_format & PERF_FORMAT_ID)
- entry += sizeof(u64);
-
- if (read_format & PERF_FORMAT_GROUP) {
- nr = evsel->core.nr_members;
- size += sizeof(u64);
- }
-
- size += entry * nr;
- return size;
-}
-
-int perf_evsel__read(struct evsel *evsel, int cpu, int thread,
- struct perf_counts_values *count)
-{
- size_t size = perf_evsel__read_size(evsel);
-
- memset(count, 0, sizeof(*count));
-
- if (FD(evsel, cpu, thread) < 0)
- return -EINVAL;
-
- if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
- return -errno;
-
- return 0;
-}
-
static int
perf_evsel__read_one(struct evsel *evsel, int cpu, int thread)
{
struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);

- return perf_evsel__read(evsel, cpu, thread, count);
+ return perf_evsel__read(&evsel->core, cpu, thread, count);
}

static void
@@ -1453,7 +1412,7 @@ perf_evsel__read_group(struct evsel *leader, int cpu, int thread)
{
struct perf_stat_evsel *ps = leader->stats;
u64 read_format = leader->core.attr.read_format;
- int size = perf_evsel__read_size(leader);
+ int size = perf_evsel__read_size(&leader->core);
u64 *data = ps->group_data;

if (!(read_format & PERF_FORMAT_ID))
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 03fc8edad492..57e315d8158e 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -336,9 +336,6 @@ static inline bool perf_evsel__match2(struct evsel *e1,
(a)->core.attr.type == (b)->core.attr.type && \
(a)->core.attr.config == (b)->core.attr.config)

-int perf_evsel__read(struct evsel *evsel, int cpu, int thread,
- struct perf_counts_values *count);
-
int perf_evsel__read_counter(struct evsel *evsel, int cpu, int thread);

int __perf_evsel__read_on_cpu(struct evsel *evsel,
--
2.21.0
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