From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Check that no-op execution speed is the same in headless mode and with the display active. v2: * Set graphics mode for the test to disable blanking. (Imre) * Use igt stats framework as suggested by Chris. v3: * Rename variable names for clearer assert. * Simplify by using I915_EXEC_DEFAULT. (Chris Wilson) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100572 Cc: Imre Deak <imre.deak@xxxxxxxxx> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- tests/gem_exec_nop.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/tests/gem_exec_nop.c b/tests/gem_exec_nop.c index 5d0d4957545e..66c2fc1dfa3c 100644 --- a/tests/gem_exec_nop.c +++ b/tests/gem_exec_nop.c @@ -112,6 +112,73 @@ static void single(int fd, uint32_t handle, ring_name, count, time*1e6 / count); } +static double +stable_nop_on_ring(int fd, uint32_t handle, unsigned int engine, + int timeout, int reps) +{ + igt_stats_t s; + double n; + + igt_assert(reps >= 5); + + igt_stats_init_with_size(&s, reps); + s.is_float = true; + + while (reps--) { + unsigned long count; + double time; + + time = nop_on_ring(fd, handle, engine, timeout, &count); + igt_stats_push_float(&s, time / count); + } + + n = igt_stats_get_median(&s); + igt_stats_fini(&s); + + return n; +} + +#define assert_within_epsilon(x, ref, tolerance) \ + igt_assert_f((x) <= (1.0 + tolerance) * ref && \ + (x) >= (1.0 - tolerance) * ref, \ + "'%s' != '%s' (%f not within %f%% tolerance of %f)\n",\ + #x, #ref, x, tolerance * 100.0, ref) + +static void headless(int fd, uint32_t handle) +{ + unsigned int nr_connected = 0; + drmModeConnector *connector; + drmModeRes *res; + double n_display, n_headless; + + res = drmModeGetResources(fd); + igt_assert(res); + + /* require at least one connected connector for the test */ + for (int i = 0; i < res->count_connectors; i++) { + connector = drmModeGetConnectorCurrent(fd, res->connectors[i]); + if (connector->connection == DRM_MODE_CONNECTED) + nr_connected++; + drmModeFreeConnector(connector); + } + igt_require(nr_connected > 0); + + /* set graphics mode to prevent blanking */ + kmstest_set_vt_graphics_mode(); + + /* benchmark nops */ + n_display = stable_nop_on_ring(fd, handle, I915_EXEC_DEFAULT, 1, 5); + + /* force all connectors off */ + kmstest_unset_all_crtcs(fd, res); + + /* benchmark nops again */ + n_headless = stable_nop_on_ring(fd, handle, I915_EXEC_DEFAULT, 1, 5); + + /* check that the two execution speeds are roughly the same */ + assert_within_epsilon(n_headless, n_display, 0.1f); +} + static bool ignore_engine(int fd, unsigned engine) { if (engine == 0) @@ -494,6 +561,9 @@ igt_main igt_subtest("context-sequential") sequential(device, handle, FORKED | CONTEXT, 150); + igt_subtest("headless") + headless(device, handle); + igt_fixture { igt_stop_hang_detector(); gem_close(device, handle); -- 2.9.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
