Add a basic test that uses PMU to read GT actual and requested frequencies while running a workload.
v2: Rebase and comments (Riana) Cc: Lucas De Marchi <[email protected]> Cc: Rodrigo Vivi <[email protected]> Cc: Riana Tauro <[email protected]> Signed-off-by: Vinay Belgaumkar <[email protected]> --- tests/intel/xe_pmu.c | 128 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 127 insertions(+), 1 deletion(-) diff --git a/tests/intel/xe_pmu.c b/tests/intel/xe_pmu.c index 175bbf374..fbac9c798 100644 --- a/tests/intel/xe_pmu.c +++ b/tests/intel/xe_pmu.c @@ -376,6 +376,94 @@ 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(gt, NULL, "gt-requested-frequency"); + pmu_fd[0] = open_group(fd, config_rq_freq, -1); + + config_act_freq = get_event_config(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]); + + 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); +} + static unsigned int enable_and_provision_vfs(int fd) { unsigned int gt, num_vfs; @@ -429,8 +517,9 @@ static void disable_vfs(int fd) igt_main { - int fd, gt; + int fd, gt, num_gts; struct drm_xe_engine_class_instance *eci; + uint32_t *stash_min, *stash_max; igt_fixture { fd = drm_open_driver(DRIVER_XE); @@ -482,6 +571,43 @@ igt_main disable_vfs(fd); } + igt_subtest_group { + igt_fixture { + igt_require(xe_sysfs_gt_has_node(fd, 0, "freq0")); + num_gts = xe_number_gt(fd); + + stash_min = (uint32_t *) malloc(sizeof(uint32_t) * num_gts); + stash_max = (uint32_t *) malloc(sizeof(uint32_t) * num_gts); + + xe_for_each_gt(fd, gt) { + stash_min[gt] = xe_gt_get_freq(fd, gt, "min"); + stash_max[gt] = xe_gt_get_freq(fd, gt, "max"); + } + } + + igt_describe("Validate PMU GT freq measured is within the tolerance"); + igt_subtest_with_dynamic("gt-frequency") { + xe_for_each_gt(fd, gt) { + igt_dynamic_f("gt%u", gt) + xe_for_each_engine(fd, eci) { + if (gt == eci->gt_id) { + test_gt_frequency(fd, eci); + break; + } + } + } + } + + igt_fixture { + xe_for_each_gt(fd, gt) { + xe_gt_set_freq(fd, gt, "max", stash_max[gt]); + xe_gt_set_freq(fd, gt, "min", stash_min[gt]); + } + free(stash_min); + free(stash_max); + } + } + igt_fixture { close(fd); } -- 2.38.1
