Very light stress test to bombard the submission backends with a large stream with requests of randomly assigned priorities. Preemption will be occasionally requested, but never succeed!
Signed-off-by: Chris Wilson <[email protected]> Cc: Michał Winiarski <[email protected]> Cc: Tvrtko Ursulin <[email protected]> --- drivers/gpu/drm/i915/selftests/intel_lrc.c | 83 ++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c index 1aea7a8f2224..8c8e6a8f7d52 100644 --- a/drivers/gpu/drm/i915/selftests/intel_lrc.c +++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c @@ -6,6 +6,7 @@ #include "../i915_selftest.h" #include "igt_flush_test.h" +#include "i915_random.h" #include "mock_context.h" @@ -573,6 +574,87 @@ static int live_preempt_hang(void *arg) return err; } +static int random_range(struct rnd_state *rnd, int min, int max) +{ + return i915_prandom_u32_max_state(max - min, rnd) + min; +} + +static int random_priority(struct rnd_state *rnd) +{ + return random_range(rnd, I915_PRIORITY_MIN, I915_PRIORITY_MAX); +} + +static int live_preempt_smoke(void *arg) +{ +#define NCTX 1024 + struct drm_i915_private *i915 = arg; + struct i915_gem_context **contexts; + struct intel_engine_cs *engine; + enum intel_engine_id id; + IGT_TIMEOUT(end_time); + I915_RND_STATE(prng); + unsigned long count; + int err = -ENOMEM; + int n; + + if (!HAS_LOGICAL_RING_PREEMPTION(i915)) + return 0; + + contexts = kmalloc_array(NCTX, sizeof(*contexts), GFP_KERNEL); + if (!contexts) + return -ENOMEM; + + mutex_lock(&i915->drm.struct_mutex); + intel_runtime_pm_get(i915); + + for (n = 0; n < NCTX; n++) { + contexts[n] = kernel_context(i915); + if (!contexts[n]) + goto err_ctx; + } + + count = 0; + do { + for_each_engine(engine, i915, id) { + struct i915_gem_context *ctx = + contexts[i915_prandom_u32_max_state(NCTX, + &prng)]; + struct i915_request *rq; + + ctx->sched.priority = random_priority(&prng); + + rq = i915_request_alloc(engine, ctx); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + goto err_ctx; + } + + i915_request_add(rq); + count++; + } + } while (!__igt_timeout(end_time, NULL)); + + pr_info("Submitted %lu requests across %d engines and %d contexts\n", + count, INTEL_INFO(i915)->num_rings, NCTX); + + err = 0; +err_ctx: + if (igt_flush_test(i915, I915_WAIT_LOCKED)) + err = -EIO; + + for (n = 0; n < NCTX; n++) { + if (!contexts[n]) + break; + kernel_context_close(contexts[n]); + } + + intel_runtime_pm_put(i915); + mutex_unlock(&i915->drm.struct_mutex); + kfree(contexts); + return err; +#undef NCTX +} + int intel_execlists_live_selftests(struct drm_i915_private *i915) { static const struct i915_subtest tests[] = { @@ -580,6 +662,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915) SUBTEST(live_preempt), SUBTEST(live_late_preempt), SUBTEST(live_preempt_hang), + SUBTEST(live_preempt_smoke), }; if (!HAS_EXECLISTS(i915)) -- 2.19.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
