A couple of very simple tests to ensure that the basic properties of per-engine busyness accounting [0% and 100% busy] are faithful.
Signed-off-by: Chris Wilson <[email protected]> --- drivers/gpu/drm/i915/gt/selftest_engine_pm.c | 94 ++++++++++++++++++++ drivers/gpu/drm/i915/gt/selftest_rps.c | 5 ++ 2 files changed, 99 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/selftest_engine_pm.c b/drivers/gpu/drm/i915/gt/selftest_engine_pm.c index cbf6b0735272..fb0fd8a7db9a 100644 --- a/drivers/gpu/drm/i915/gt/selftest_engine_pm.c +++ b/drivers/gpu/drm/i915/gt/selftest_engine_pm.c @@ -7,6 +7,99 @@ #include "i915_selftest.h" #include "selftest_engine.h" #include "selftests/igt_atomic.h" +#include "selftests/igt_flush_test.h" +#include "selftests/igt_spinner.h" + +static int live_engine_busy_stats(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + enum intel_engine_id id; + struct igt_spinner spin; + int err = 0; + + /* + * Check that if an engine supports busy-stats, they tell the truth. + */ + + if (igt_spinner_init(&spin, gt)) + return -ENOMEM; + + GEM_BUG_ON(intel_gt_pm_is_awake(gt)); + for_each_engine(engine, gt, id) { + struct i915_request *rq; + ktime_t de; + u64 dt; + + if (!intel_engine_supports_stats(engine)) + continue; + + if (!intel_engine_can_store_dword(engine)) + continue; + + if (intel_gt_pm_wait_for_idle(gt)) { + err = -EBUSY; + break; + } + + preempt_disable(); + dt = ktime_to_ns(ktime_get()); + de = intel_engine_get_busy_time(engine); + udelay(100); + de = ktime_sub(intel_engine_get_busy_time(engine), de); + dt = ktime_to_ns(ktime_get()) - dt; + preempt_enable(); + if (de > 10) { + pr_err("%s: reported %lldns [%d%%] busyness while sleeping [for %lldns]\n", + engine->name, + de, (int)div64_u64(100 * de, dt), dt); + err = -EINVAL; + break; + } + + /* 100% busy */ + rq = igt_spinner_create_request(&spin, + engine->kernel_context, + MI_NOOP); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + break; + } + i915_request_add(rq); + + if (!igt_wait_for_spinner(&spin, rq)) { + intel_gt_set_wedged(engine->gt); + err = -ETIME; + break; + } + + preempt_disable(); + dt = ktime_to_ns(ktime_get()); + de = intel_engine_get_busy_time(engine); + udelay(100); + de = ktime_sub(intel_engine_get_busy_time(engine), de); + dt = ktime_to_ns(ktime_get()) - dt; + preempt_enable(); + if (100 * de < 95 * dt || 95 * de > 100 * dt) { + pr_err("%s: reported %lldns [%d%%] busyness while spinning [for %lldns]\n", + engine->name, + de, (int)div64_u64(100 * de, dt), dt); + err = -EINVAL; + break; + } + + igt_spinner_end(&spin); + if (igt_flush_test(gt->i915)) { + err = -EIO; + break; + } + } + + igt_spinner_fini(&spin); + if (igt_flush_test(gt->i915)) + err = -EIO; + return err; +} static int live_engine_pm(void *arg) { @@ -77,6 +170,7 @@ static int live_engine_pm(void *arg) int live_engine_pm_selftests(struct intel_gt *gt) { static const struct i915_subtest tests[] = { + SUBTEST(live_engine_busy_stats), SUBTEST(live_engine_pm), }; diff --git a/drivers/gpu/drm/i915/gt/selftest_rps.c b/drivers/gpu/drm/i915/gt/selftest_rps.c index 5049c3dd08a6..5e364fb31aea 100644 --- a/drivers/gpu/drm/i915/gt/selftest_rps.c +++ b/drivers/gpu/drm/i915/gt/selftest_rps.c @@ -1252,6 +1252,11 @@ int live_rps_dynamic(void *arg) if (igt_spinner_init(&spin, gt)) return -ENOMEM; + if (intel_rps_has_interrupts(rps)) + pr_info("RPS has interrupt support\n"); + if (intel_rps_uses_timer(rps)) + pr_info("RPS has timer support\n"); + for_each_engine(engine, gt, id) { struct i915_request *rq; struct { -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
