diff options
| -rw-r--r-- | tools/perf/tests/mmap-basic.c | 127 |
1 files changed, 126 insertions, 1 deletions
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c index 30bbe144648a..dfb6173b2a82 100644 --- a/tools/perf/tests/mmap-basic.c +++ b/tools/perf/tests/mmap-basic.c @@ -170,14 +170,139 @@ out_free_threads: return err; } +static int test_stat_user_read(int event) +{ + struct perf_counts_values counts = { .val = 0 }; + struct perf_thread_map *threads; + struct perf_evsel *evsel; + struct perf_event_mmap_page *pc; + struct perf_event_attr attr = { + .type = PERF_TYPE_HARDWARE, + .config = event, +#ifdef __aarch64__ + .config1 = 0x2, /* Request user access */ +#endif + }; + int err, i, ret = TEST_FAIL; + bool opened = false, mapped = false; + + threads = perf_thread_map__new_dummy(); + TEST_ASSERT_VAL("failed to create threads", threads); + + perf_thread_map__set_pid(threads, 0, 0); + + evsel = perf_evsel__new(&attr); + TEST_ASSERT_VAL("failed to create evsel", evsel); + + err = perf_evsel__open(evsel, NULL, threads); + if (err) { + pr_err("failed to open evsel: %s\n", strerror(-err)); + ret = TEST_SKIP; + goto out; + } + opened = true; + + err = perf_evsel__mmap(evsel, 0); + if (err) { + pr_err("failed to mmap evsel: %s\n", strerror(-err)); + goto out; + } + mapped = true; + + pc = perf_evsel__mmap_base(evsel, 0, 0); + if (!pc) { + pr_err("failed to get mmapped address\n"); + goto out; + } + + if (!pc->cap_user_rdpmc || !pc->index) { + pr_err("userspace counter access not %s\n", + !pc->cap_user_rdpmc ? "supported" : "enabled"); + ret = TEST_SKIP; + goto out; + } + if (pc->pmc_width < 32) { + pr_err("userspace counter width not set (%d)\n", pc->pmc_width); + goto out; + } + + perf_evsel__read(evsel, 0, 0, &counts); + if (counts.val == 0) { + pr_err("failed to read value for evsel\n"); + goto out; + } + + for (i = 0; i < 5; i++) { + volatile int count = 0x10000 << i; + __u64 start, end, last = 0; + + pr_debug("\tloop = %u, ", count); + + perf_evsel__read(evsel, 0, 0, &counts); + start = counts.val; + + while (count--) ; + + perf_evsel__read(evsel, 0, 0, &counts); + end = counts.val; + + if ((end - start) < last) { + pr_err("invalid counter data: end=%llu start=%llu last= %llu\n", + end, start, last); + goto out; + } + last = end - start; + pr_debug("count = %llu\n", end - start); + } + ret = TEST_OK; + +out: + if (mapped) + perf_evsel__munmap(evsel); + if (opened) + perf_evsel__close(evsel); + perf_evsel__delete(evsel); + + perf_thread_map__put(threads); + return ret; +} + +static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused, + int subtest __maybe_unused) +{ + return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS); +} + +static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused, + int subtest __maybe_unused) +{ + return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES); +} + static struct test_case tests__basic_mmap[] = { TEST_CASE_REASON("Read samples using the mmap interface", basic_mmap, "permissions"), + TEST_CASE_REASON("User space counter reading of instructions", + mmap_user_read_instr, +#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) + "permissions" +#else + "unsupported" +#endif + ), + TEST_CASE_REASON("User space counter reading of cycles", + mmap_user_read_cycles, +#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) + "permissions" +#else + "unsupported" +#endif + ), { .name = NULL, } }; struct test_suite suite__basic_mmap = { - .desc = "Read samples using the mmap interface", + .desc = "mmap interface tests", .test_cases = tests__basic_mmap, }; |