drm/i915/selftests: Check recovery from corrupted LRC (24eba7a9) · Commits · 戴 / test

drivers/gpu/drm/i915/gt/selftest_lrc.c

+135 −0

Original line number	Diff line number	Diff line
		@@ -5280,6 +5280,140 @@ static int live_lrc_isolation(void *arg)
		return 0;
		}

		static void garbage_reset(struct intel_engine_cs *engine,
		struct i915_request *rq)
		{
		const unsigned int bit = I915_RESET_ENGINE + engine->id;
		unsigned long *lock = &engine->gt->reset.flags;

		if (test_and_set_bit(bit, lock))
		return;

		tasklet_disable(&engine->execlists.tasklet);

		if (!rq->fence.error)
		intel_engine_reset(engine, NULL);

		tasklet_enable(&engine->execlists.tasklet);
		clear_and_wake_up_bit(bit, lock);
		}

		static struct i915_request garbage(struct intel_context ce,
		struct rnd_state *prng)
		{
		struct i915_request *rq;
		int err;

		err = intel_context_pin(ce);
		if (err)
		return ERR_PTR(err);

		prandom_bytes_state(prng,
		ce->lrc_reg_state,
		ce->engine->context_size -
		LRC_STATE_PN * PAGE_SIZE);

		rq = intel_context_create_request(ce);
		if (IS_ERR(rq)) {
		err = PTR_ERR(rq);
		goto err_unpin;
		}

		i915_request_get(rq);
		i915_request_add(rq);
		return rq;

		err_unpin:
		intel_context_unpin(ce);
		return ERR_PTR(err);
		}

		static int __lrc_garbage(struct intel_engine_cs engine, struct rnd_state prng)
		{
		struct intel_context *ce;
		struct i915_request *hang;
		int err = 0;

		ce = intel_context_create(engine);
		if (IS_ERR(ce))
		return PTR_ERR(ce);

		hang = garbage(ce, prng);
		if (IS_ERR(hang)) {
		err = PTR_ERR(hang);
		goto err_ce;
		}

		if (wait_for_submit(engine, hang, HZ / 2)) {
		i915_request_put(hang);
		err = -ETIME;
		goto err_ce;
		}

		intel_context_set_banned(ce);
		garbage_reset(engine, hang);

		intel_engine_flush_submission(engine);
		if (!hang->fence.error) {
		i915_request_put(hang);
		pr_err("%s: corrupted context was not reset\n",
		engine->name);
		err = -EINVAL;
		goto err_ce;
		}

		if (i915_request_wait(hang, 0, HZ / 2) < 0) {
		pr_err("%s: corrupted context did not recover\n",
		engine->name);
		i915_request_put(hang);
		err = -EIO;
		goto err_ce;
		}
		i915_request_put(hang);

		err_ce:
		intel_context_put(ce);
		return err;
		}

		static int live_lrc_garbage(void *arg)
		{
		struct intel_gt *gt = arg;
		struct intel_engine_cs *engine;
		enum intel_engine_id id;

		/*
		* Verify that we can recover if one context state is completely
		* corrupted.
		*/

		if (!IS_ENABLED(CONFIG_DRM_I915_SELFTEST_BROKEN))
		return 0;

		for_each_engine(engine, gt, id) {
		I915_RND_STATE(prng);
		int err = 0, i;

		if (!intel_has_reset_engine(engine->gt))
		continue;

		intel_engine_pm_get(engine);
		for (i = 0; i < 3; i++) {
		err = __lrc_garbage(engine, &prng);
		if (err)
		break;
		}
		intel_engine_pm_put(engine);

		if (igt_flush_test(gt->i915))
		err = -EIO;
		if (err)
		return err;
		}

		return 0;
		}

		static int __live_pphwsp_runtime(struct intel_engine_cs *engine)
		{
		struct intel_context *ce;
		@@ -5379,6 +5513,7 @@ int intel_lrc_live_selftests(struct drm_i915_private *i915)
		SUBTEST(live_lrc_gpr),
		SUBTEST(live_lrc_isolation),
		SUBTEST(live_lrc_timestamp),
		SUBTEST(live_lrc_garbage),
		SUBTEST(live_pphwsp_runtime),
		};

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