drm/i915: Live testing of empty requests (cd3862dc) · Commits · 戴 / test

drivers/gpu/drm/i915/selftests/i915_gem_request.c

+155 −0

Original line number	Original line	Diff line number	Diff line
	@@ -338,6 +338,160 @@ out_unlock:
	return err;		return err;
	}		}

			static struct i915_vma empty_batch(struct drm_i915_private i915)
			{
			struct drm_i915_gem_object *obj;
			struct i915_vma *vma;
			u32 *cmd;
			int err;

			obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
			if (IS_ERR(obj))
			return ERR_CAST(obj);

			cmd = i915_gem_object_pin_map(obj, I915_MAP_WB);
			if (IS_ERR(cmd)) {
			err = PTR_ERR(cmd);
			goto err;
			}
			*cmd = MI_BATCH_BUFFER_END;
			i915_gem_object_unpin_map(obj);

			err = i915_gem_object_set_to_gtt_domain(obj, false);
			if (err)
			goto err;

			vma = i915_vma_instance(obj, &i915->ggtt.base, NULL);
			if (IS_ERR(vma)) {
			err = PTR_ERR(vma);
			goto err;
			}

			err = i915_vma_pin(vma, 0, 0, PIN_USER \| PIN_GLOBAL);
			if (err)
			goto err;

			return vma;

			err:
			i915_gem_object_put(obj);
			return ERR_PTR(err);
			}

			static struct drm_i915_gem_request *
			empty_request(struct intel_engine_cs *engine,
			struct i915_vma *batch)
			{
			struct drm_i915_gem_request *request;
			int err;

			request = i915_gem_request_alloc(engine,
			engine->i915->kernel_context);
			if (IS_ERR(request))
			return request;

			err = engine->emit_flush(request, EMIT_INVALIDATE);
			if (err)
			goto out_request;

			err = i915_switch_context(request);
			if (err)
			goto out_request;

			err = engine->emit_bb_start(request,
			batch->node.start,
			batch->node.size,
			I915_DISPATCH_SECURE);
			if (err)
			goto out_request;

			out_request:
			__i915_add_request(request, err == 0);
			return err ? ERR_PTR(err) : request;
			}

			static int live_empty_request(void *arg)
			{
			struct drm_i915_private *i915 = arg;
			struct intel_engine_cs *engine;
			struct live_test t;
			struct i915_vma *batch;
			unsigned int id;
			int err = 0;

			/* Submit various sized batches of empty requests, to each engine
			* (individually), and wait for the batch to complete. We can check
			* the overhead of submitting requests to the hardware.
			*/

			mutex_lock(&i915->drm.struct_mutex);

			batch = empty_batch(i915);
			if (IS_ERR(batch)) {
			err = PTR_ERR(batch);
			goto out_unlock;
			}

			for_each_engine(engine, i915, id) {
			IGT_TIMEOUT(end_time);
			struct drm_i915_gem_request *request;
			unsigned long n, prime;
			ktime_t times[2] = {};

			err = begin_live_test(&t, i915, __func__, engine->name);
			if (err)
			goto out_batch;

			/* Warmup / preload */
			request = empty_request(engine, batch);
			if (IS_ERR(request)) {
			err = PTR_ERR(request);
			goto out_batch;
			}
			i915_wait_request(request,
			I915_WAIT_LOCKED,
			MAX_SCHEDULE_TIMEOUT);

			for_each_prime_number_from(prime, 1, 8192) {
			times[1] = ktime_get_raw();

			for (n = 0; n < prime; n++) {
			request = empty_request(engine, batch);
			if (IS_ERR(request)) {
			err = PTR_ERR(request);
			goto out_batch;
			}
			}
			i915_wait_request(request,
			I915_WAIT_LOCKED,
			MAX_SCHEDULE_TIMEOUT);

			times[1] = ktime_sub(ktime_get_raw(), times[1]);
			if (prime == 1)
			times[0] = times[1];

			if (__igt_timeout(end_time, NULL))
			break;
			}

			err = end_live_test(&t);
			if (err)
			goto out_batch;

			pr_info("Batch latencies on %s: 1 = %lluns, %lu = %lluns\n",
			engine->name,
			ktime_to_ns(times[0]),
			prime, div64_u64(ktime_to_ns(times[1]), prime));
			}

			out_batch:
			i915_vma_unpin(batch);
			i915_vma_put(batch);
			out_unlock:
			mutex_unlock(&i915->drm.struct_mutex);
			return err;
			}

	static struct i915_vma recursive_batch(struct drm_i915_private i915)		static struct i915_vma recursive_batch(struct drm_i915_private i915)
	{		{
	struct i915_gem_context *ctx = i915->kernel_context;		struct i915_gem_context *ctx = i915->kernel_context;
	@@ -658,6 +812,7 @@ int i915_gem_request_live_selftests(struct drm_i915_private *i915)
	SUBTEST(live_nop_request),		SUBTEST(live_nop_request),
	SUBTEST(live_all_engines),		SUBTEST(live_all_engines),
	SUBTEST(live_sequential_engines),		SUBTEST(live_sequential_engines),
			SUBTEST(live_empty_request),
	};		};
	return i915_subtests(tests, i915);		return i915_subtests(tests, i915);
	}		}

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