libperf: Add a test case for read formats

It checks a various combination of the read format settings and verify
it return the value in a proper position.  The test uses task-clock
software events to guarantee it's always active and sets enabled/running
time.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220819003644.508916-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/lib/perf/tests/test-evsel.c b/tools/lib/perf/tests/test-evsel.c
index 89be89a..a11fc51 100644 (file)
--- a/tools/lib/perf/tests/test-evsel.c
+++ b/tools/lib/perf/tests/test-evsel.c
@@ -1,10 +1,13 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <stdarg.h>
 #include <stdio.h>
+#include <string.h>
 #include <linux/perf_event.h>
+#include <linux/kernel.h>
 #include <perf/cpumap.h>
 #include <perf/threadmap.h>
 #include <perf/evsel.h>
+#include <internal/evsel.h>
 #include <internal/tests.h>
 #include "tests.h"
 
@@ -189,6 +192,163 @@ static int test_stat_user_read(int event)
        return 0;
 }
 
+static int test_stat_read_format_single(struct perf_event_attr *attr, struct perf_thread_map *threads)
+{
+       struct perf_evsel *evsel;
+       struct perf_counts_values counts;
+       volatile int count = 0x100000;
+       int err;
+
+       evsel = perf_evsel__new(attr);
+       __T("failed to create evsel", evsel);
+
+       /* skip old kernels that don't support the format */
+       err = perf_evsel__open(evsel, NULL, threads);
+       if (err < 0)
+               return 0;
+
+       while (count--) ;
+
+       memset(&counts, -1, sizeof(counts));
+       perf_evsel__read(evsel, 0, 0, &counts);
+
+       __T("failed to read value", counts.val);
+       if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+               __T("failed to read TOTAL_TIME_ENABLED", counts.ena);
+       if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+               __T("failed to read TOTAL_TIME_RUNNING", counts.run);
+       if (attr->read_format & PERF_FORMAT_ID)
+               __T("failed to read ID", counts.id);
+       if (attr->read_format & PERF_FORMAT_LOST)
+               __T("failed to read LOST", counts.lost == 0);
+
+       perf_evsel__close(evsel);
+       perf_evsel__delete(evsel);
+       return 0;
+}
+
+static int test_stat_read_format_group(struct perf_event_attr *attr, struct perf_thread_map *threads)
+{
+       struct perf_evsel *leader, *member;
+       struct perf_counts_values counts;
+       volatile int count = 0x100000;
+       int err;
+
+       attr->read_format |= PERF_FORMAT_GROUP;
+       leader = perf_evsel__new(attr);
+       __T("failed to create leader", leader);
+
+       attr->read_format &= ~PERF_FORMAT_GROUP;
+       member = perf_evsel__new(attr);
+       __T("failed to create member", member);
+
+       member->leader = leader;
+       leader->nr_members = 2;
+
+       /* skip old kernels that don't support the format */
+       err = perf_evsel__open(leader, NULL, threads);
+       if (err < 0)
+               return 0;
+       err = perf_evsel__open(member, NULL, threads);
+       if (err < 0)
+               return 0;
+
+       while (count--) ;
+
+       memset(&counts, -1, sizeof(counts));
+       perf_evsel__read(leader, 0, 0, &counts);
+
+       __T("failed to read leader value", counts.val);
+       if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+               __T("failed to read leader TOTAL_TIME_ENABLED", counts.ena);
+       if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+               __T("failed to read leader TOTAL_TIME_RUNNING", counts.run);
+       if (attr->read_format & PERF_FORMAT_ID)
+               __T("failed to read leader ID", counts.id);
+       if (attr->read_format & PERF_FORMAT_LOST)
+               __T("failed to read leader LOST", counts.lost == 0);
+
+       memset(&counts, -1, sizeof(counts));
+       perf_evsel__read(member, 0, 0, &counts);
+
+       __T("failed to read member value", counts.val);
+       if (attr->read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+               __T("failed to read member TOTAL_TIME_ENABLED", counts.ena);
+       if (attr->read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+               __T("failed to read member TOTAL_TIME_RUNNING", counts.run);
+       if (attr->read_format & PERF_FORMAT_ID)
+               __T("failed to read member ID", counts.id);
+       if (attr->read_format & PERF_FORMAT_LOST)
+               __T("failed to read member LOST", counts.lost == 0);
+
+       perf_evsel__close(member);
+       perf_evsel__close(leader);
+       perf_evsel__delete(member);
+       perf_evsel__delete(leader);
+       return 0;
+}
+
+static int test_stat_read_format(void)
+{
+       struct perf_thread_map *threads;
+       struct perf_event_attr attr = {
+               .type   = PERF_TYPE_SOFTWARE,
+               .config = PERF_COUNT_SW_TASK_CLOCK,
+       };
+       int err, i;
+
+#define FMT(_fmt)  PERF_FORMAT_ ## _fmt
+#define FMT_TIME  (FMT(TOTAL_TIME_ENABLED) | FMT(TOTAL_TIME_RUNNING))
+
+       uint64_t test_formats [] = {
+               0,
+               FMT_TIME,
+               FMT(ID),
+               FMT(LOST),
+               FMT_TIME | FMT(ID),
+               FMT_TIME | FMT(LOST),
+               FMT_TIME | FMT(ID) | FMT(LOST),
+               FMT(ID) | FMT(LOST),
+       };
+
+#undef FMT
+#undef FMT_TIME
+
+       threads = perf_thread_map__new_dummy();
+       __T("failed to create threads", threads);
+
+       perf_thread_map__set_pid(threads, 0, 0);
+
+       for (i = 0; i < (int)ARRAY_SIZE(test_formats); i++) {
+               attr.read_format = test_formats[i];
+               __T_VERBOSE("testing single read with read_format: %lx\n",
+                           (unsigned long)test_formats[i]);
+
+               err = test_stat_read_format_single(&attr, threads);
+               __T("failed to read single format", err == 0);
+       }
+
+       perf_thread_map__put(threads);
+
+       threads = perf_thread_map__new_array(2, NULL);
+       __T("failed to create threads", threads);
+
+       perf_thread_map__set_pid(threads, 0, 0);
+       perf_thread_map__set_pid(threads, 1, 0);
+
+       for (i = 0; i < (int)ARRAY_SIZE(test_formats); i++) {
+               attr.read_format = test_formats[i];
+               __T_VERBOSE("testing group read with read_format: %lx\n",
+                           (unsigned long)test_formats[i]);
+
+               err = test_stat_read_format_group(&attr, threads);
+               __T("failed to read group format", err == 0);
+       }
+
+       perf_thread_map__put(threads);
+       return 0;
+}
+
 int test_evsel(int argc, char **argv)
 {
        __T_START;
@@ -200,6 +360,7 @@ int test_evsel(int argc, char **argv)
        test_stat_thread_enable();
        test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);
        test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);
+       test_stat_read_format();
 
        __T_END;
        return tests_failed == 0 ? 0 : -1;