[igt-dev] [PATCH i-g-t v2 2/2] tests/gem_eio: Add reset and unwedge stress testing

[Antonio Argenziano]

On 03/04/18 04:36, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Reset and unwedge stress testing is supposed to trigger wedging or resets
> at incovenient times and then re-use the context so either the context or
> driver tracking might get confused and break.
> 
> v2:
>   * Renamed for more sensible naming.
>   * Added some comments to explain what the test is doing. (Chris Wilson)
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>   tests/gem_eio.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 74 insertions(+)
> 
> diff --git a/tests/gem_eio.c b/tests/gem_eio.c
> index b7c5047f0816..9599e73db736 100644
> --- a/tests/gem_eio.c
> +++ b/tests/gem_eio.c
> @@ -591,6 +591,74 @@ static void test_inflight_internal(int fd, unsigned int wait)
>   	close(fd);
>   }
>   
> +/*
> + * Verify that we can submit and execute work after unwedging the GPU.
> + */
> +static void test_reset_stress(int fd, unsigned int flags)
> +{
> +	uint32_t ctx0 = gem_context_create(fd);
> +
> +	igt_until_timeout(5) {
> +		struct drm_i915_gem_execbuffer2 execbuf = { };
> +		struct drm_i915_gem_exec_object2 obj = { };
> +		uint32_t bbe = MI_BATCH_BUFFER_END;
> +		igt_spin_t *hang;
> +		unsigned int i;
> +		uint32_t ctx;
> +
> +		gem_quiescent_gpu(fd);
> +
> +		igt_require(i915_reset_control(flags & TEST_WEDGE ?
> +					       false : true));
> +
> +		ctx = context_create_safe(fd);
> +
> +		/*
> +		 * Start executing a spin batch with some queued batches
> +		 * against a different context after it.
> +		 */

Aren't all batches queued on ctx0? Or is this a reference to the check 
on ctx you have later in the test.

Thanks,
Antonio

> +		hang = spin_sync(fd, ctx0, 0);
> +
> +		obj.handle = gem_create(fd, 4096);
> +		gem_write(fd, obj.handle, 0, &bbe, sizeof(bbe));
> +
> +		execbuf.buffers_ptr = to_user_pointer(&obj);
> +		execbuf.buffer_count = 1;
> +		execbuf.rsvd1 = ctx0;
> +
> +		for (i = 0; i < 10; i++)
> +			gem_execbuf(fd, &execbuf);
> +
> +		/* Wedge after a small delay. */
> +		igt_assert_eq(__check_wait(fd, obj.handle, 100e3), 0);
> +
> +		/* Unwedge by forcing a reset. */
> +		igt_assert(i915_reset_control(true));
> +		trigger_reset(fd);
> +
> +		gem_quiescent_gpu(fd);
> +
> +		/*
> +		 * Verify that we are able to submit work after unwedging from
> +		 * both contexts.
> +		 */
> +		execbuf.rsvd1 = ctx;
> +		for (i = 0; i < 5; i++)
> +			gem_execbuf(fd, &execbuf);
> +
> +		execbuf.rsvd1 = ctx0;
> +		for (i = 0; i < 5; i++)
> +			gem_execbuf(fd, &execbuf);
> +
> +		gem_sync(fd, obj.handle);
> +		igt_spin_batch_free(fd, hang);
> +		gem_context_destroy(fd, ctx);
> +		gem_close(fd, obj.handle);
> +	}
> +
> +	gem_context_destroy(fd, ctx0);
> +}
> +
>   static int fd = -1;
>   
>   static void
> @@ -635,6 +703,12 @@ igt_main
>   	igt_subtest("in-flight-suspend")
>   		test_inflight_suspend(fd);
>   
> +	igt_subtest("reset-stress")
> +		test_reset_stress(fd, 0);
> +
> +	igt_subtest("unwedge-stress")
> +		test_reset_stress(fd, TEST_WEDGE);
> +
>   	igt_subtest_group {
>   		const struct {
>   			unsigned int wait;
>