Add a basic test that uses PMU to read GT actual and requested frequencies while running a workload.
Cc: Lucas De Marchi <[email protected]> Cc: Rodrigo Vivi <[email protected]> Signed-off-by: Vinay Belgaumkar <[email protected]> --- tests/intel/xe_pmu.c | 93 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) diff --git a/tests/intel/xe_pmu.c b/tests/intel/xe_pmu.c index 66edf24ad..43085b4d0 100644 --- a/tests/intel/xe_pmu.c +++ b/tests/intel/xe_pmu.c @@ -226,6 +226,95 @@ static void test_gt_c6_idle(int xe, unsigned int gt) close(pmu_fd); } +/** + * SUBTEST: gt-frequency + * Description: Validate we can collect accurate frequency PMU stats + * while running a workload. + */ +static void test_gt_frequency(int fd, struct drm_xe_engine_class_instance *eci) +{ + struct xe_cork *cork = NULL; + uint64_t end[2], start[2]; + unsigned long config_rq_freq, config_act_freq; + double min[2], max[2]; + uint32_t gt = eci->gt_id; + uint32_t orig_min = xe_gt_get_freq(fd, eci->gt_id, "min"); + uint32_t orig_max = xe_gt_get_freq(fd, eci->gt_id, "max"); + uint32_t vm; + int pmu_fd[2]; + + config_rq_freq = get_event_config(fd, gt, NULL, "gt-requested-frequency"); + pmu_fd[0] = open_group(fd, config_rq_freq, -1); + + config_act_freq = get_event_config(fd, gt, NULL, "gt-actual-frequency"); + pmu_fd[1] = open_group(fd, config_act_freq, pmu_fd[0]); + + vm = xe_vm_create(fd, 0, 0); + + cork = xe_cork_create_opts(fd, eci, vm, 1, 1); + xe_cork_sync_start(fd, cork); + + /* + * Set GPU to min frequency and read PMU counters. + */ + igt_assert(xe_gt_set_freq(fd, gt, "max", orig_min) > 0); + igt_assert(xe_gt_get_freq(fd, gt, "max") == orig_min); + + pmu_read_multi(pmu_fd[0], 2, start); + usleep(SLEEP_DURATION * USEC_PER_SEC); + pmu_read_multi(pmu_fd[0], 2, end); + + min[0] = (end[0] - start[0]); + min[1] = (end[1] - start[1]); + + /* + * Set GPU to max frequency and read PMU counters. + */ + igt_assert(xe_gt_set_freq(fd, gt, "max", orig_max) > 0); + igt_assert(xe_gt_get_freq(fd, gt, "max") == orig_max); + igt_assert(xe_gt_set_freq(fd, gt, "min", orig_max) > 0); + igt_assert(xe_gt_get_freq(fd, gt, "min") == orig_max); + + pmu_read_multi(pmu_fd[0], 2, start); + usleep(SLEEP_DURATION * USEC_PER_SEC); + pmu_read_multi(pmu_fd[0], 2, end); + + max[0] = (end[0] - start[0]); + max[1] = (end[1] - start[1]); + + if (!cork->ended) + xe_cork_sync_end(fd, cork); + + /* + * Restore min/max. + */ + igt_assert(xe_gt_set_freq(fd, gt, "min", orig_min) > 0); + igt_assert(xe_gt_get_freq(fd, gt, "min") == orig_min); + + igt_info("Minimum frequency: requested %.1f, actual %.1f\n", + min[0], min[1]); + igt_info("Maximum frequency: requested %.1f, actual %.1f\n", + max[0], max[1]); + + close(pmu_fd[0]); + close(pmu_fd[1]); + + if (cork) + xe_cork_destroy(fd, cork); + + xe_vm_destroy(fd, vm); + + close(pmu_fd[0]); + close(pmu_fd[1]); + + assert_within_epsilon(min[0], orig_min, tolerance); + /* + * On thermally throttled devices we cannot be sure maximum frequency + * can be reached so use larger tolerance downwards. + */ + assert_within_epsilon_up_down(max[0], orig_max, tolerance, 0.15f); +} + igt_main { int fd, gt; @@ -254,6 +343,10 @@ igt_main test_each_engine("engine-activity-load", fd, eci) engine_activity(fd, eci, TEST_LOAD); + igt_describe("Validate PMU GT freq measured is within the tolerance"); + test_each_engine("gt-frequency", fd, eci) + test_gt_frequency(fd, eci); + igt_fixture { close(fd); } -- 2.38.1
