diff options
author | Martin Peres <martin.peres@mupuf.org> | 2021-02-16 11:43:58 +0200 |
---|---|---|
committer | Martin Peres <martin.peres@mupuf.org> | 2021-02-18 15:08:05 +0200 |
commit | 34ccd8e8c38587e7d46ec964d30d17863b166fda (patch) | |
tree | 11625255497f11b52333061bed340eeb84d188dd | |
parent | 4c9a44d28ba89b26ed9409a6693640ca95f48ae5 (diff) |
amdgpu/info: add timestamp-related tests
This test makes sure:
* the clock is running at the expected rate
* (potential) power gating has no effect on the clock
v2:
- use signed integer for the gpu timestamp diff (Bas)
v3:
- add test and subtest descriptions (Arek)
- split the fast and long tests in different subtests (Martin)
- use igt_stats to compute actual statistics (Chris)
v4:
- call igt_stats_fini() after finishing with the stats (Petri)
v5:
- add a human-readable text to asserts (Petri)
- assert directly on the function call, not its return value (Petri)
Signed-off-by: Martin Peres <martin.peres@mupuf.org>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
-rw-r--r-- | tests/amdgpu/amd_info.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/tests/amdgpu/amd_info.c b/tests/amdgpu/amd_info.c index b8f61e16..d6aea827 100644 --- a/tests/amdgpu/amd_info.c +++ b/tests/amdgpu/amd_info.c @@ -43,6 +43,82 @@ static void query_firmware_version_test(void) "Failed to query the firmware version\n"); } +static void query_timestamp_test(uint32_t sleep_time, int sample_count) +{ + struct amdgpu_gpu_info gpu_info = {}; + double median, std_err, err_95_conf; + igt_stats_t stats; + float ns_per_tick; + int i; + + igt_stats_init_with_size(&stats, sample_count); + + /* figure out how many nanoseconds each gpu timestamp tick represents */ + igt_assert_f(amdgpu_query_gpu_info(dev, &gpu_info) == 0, + "Failed to query the gpu information\n"); + igt_assert_f(gpu_info.gpu_counter_freq > 0, + "The GPU counter frequency cannot be undefined\n"); + ns_per_tick = 1e9 / (gpu_info.gpu_counter_freq * 1000.0); + + /* acquire the data needed for the analysis */ + for (i = 0; i < sample_count; i++) { + uint64_t ts_start, ts_end, cpu_delta; + int64_t gpu_delta; + float corrected_gpu_delta; + struct timespec ts_cpu; + + igt_assert_f(igt_gettime(&ts_cpu) == 0, + "Failed to read the CPU-provided time"); + + igt_assert_f(amdgpu_query_info(dev, AMDGPU_INFO_TIMESTAMP, 8, + &ts_start) == 0, + "Failed to query the GPU start timestamp\n"); + + usleep(sleep_time); + + igt_assert_f(amdgpu_query_info(dev, AMDGPU_INFO_TIMESTAMP, 8, + &ts_end) == 0, + "Failed to query the GPU end timestamp\n"); + + /* get the GPU and CPU deltas */ + cpu_delta = igt_nsec_elapsed(&ts_cpu); + gpu_delta = ts_end - ts_start; + corrected_gpu_delta = gpu_delta * ns_per_tick; + + /* make sure the GPU timestamps are ordered */ + igt_assert_f(gpu_delta > 0, + "The GPU time is not moving or is ticking in the " + "wrong direction (start=%lu, end=%lu, " + "end-start=%lu)\n", ts_start, ts_end, gpu_delta); + + igt_stats_push_float(&stats, corrected_gpu_delta / cpu_delta); + } + + /* generate the statistics */ + median = igt_stats_get_median(&stats); + std_err = igt_stats_get_std_error(&stats); + err_95_conf = std_err * 1.96; + + /* check that the median ticking rate is ~1.0, meaning that the + * the GPU and CPU timestamps grow at the same rate + */ + igt_assert_f(median > 0.99 && median < 1.01, + "The GPU time elapses at %.2f%% (+/- %.2f%% at 95%% " + "confidence) of the CPU's speed\ngpu_counter_freq=%u kHz, " + "should be %.0f kHz (+/- %.1f kHz at 95%% confidence)\n", + median * 100.0, err_95_conf * 100.0, + gpu_info.gpu_counter_freq, + gpu_info.gpu_counter_freq * median, + gpu_info.gpu_counter_freq * err_95_conf); + + /* check the jitter in the ticking rate */ + igt_assert_f(err_95_conf < 0.01, + "The GPU time ticks with a jitter greater than 1%%, at " + "95%% confidence (+/- %.3f%%)\n", err_95_conf * 100.0); + + igt_stats_fini(&stats); +} + IGT_TEST_DESCRIPTION("Test the consistency of the data provided through the " "DRM_AMDGPU_INFO IOCTL"); igt_main @@ -66,6 +142,16 @@ igt_main igt_subtest("query-firmware-version") query_firmware_version_test(); + igt_describe("Check that the GPU time ticks constantly, and at the " + "same rate as the CPU"); + igt_subtest("query-timestamp") + query_timestamp_test(10000, 100); + + igt_describe("Check that the GPU time keeps on ticking, even during " + "long idle times which could lead to clock/power gating"); + igt_subtest("query-timestamp-while-idle") + query_timestamp_test(7000000, 1); + igt_fixture { amdgpu_device_deinitialize(dev); close(fd); |