[Intel-gfx] [PATCH igt 08/10] igt/gem_exec_fence: Exercise merging fences

[Michał Winiarski]

On Fri, Jul 28, 2017 at 01:08:06PM +0100, Chris Wilson wrote:
> Execute the same batch on each engine and check that the composite fence
> across all engines completes only after the batch is completed on every
> engine.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  tests/gem_exec_fence.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 120 insertions(+)
> 
> diff --git a/tests/gem_exec_fence.c b/tests/gem_exec_fence.c
> index b094f585..c7fa249b 100644
> --- a/tests/gem_exec_fence.c
> +++ b/tests/gem_exec_fence.c
> @@ -199,6 +199,111 @@ static void test_fence_busy(int fd, unsigned ring, unsigned flags)
>  	gem_quiescent_gpu(fd);
>  }
>  
> +static void test_fence_busy_all(int fd, unsigned flags)
> +{
> +	const int gen = intel_gen(intel_get_drm_devid(fd));
> +	struct drm_i915_gem_exec_object2 obj;
> +	struct drm_i915_gem_relocation_entry reloc;
> +	struct drm_i915_gem_execbuffer2 execbuf;
> +	struct timespec tv;
> +	uint32_t *batch;
> +	unsigned int engine;
> +	int all, i, timeout;

[SNIP]

> +	for_each_engine(fd, engine) {
> +		int fence, new;
> +
> +		execbuf.flags = engine | LOCAL_EXEC_FENCE_OUT;
> +		execbuf.rsvd2 = -1;
> +		gem_execbuf_wr(fd, &execbuf);
> +		fence = execbuf.rsvd2 >> 32;
> +		igt_assert(fence != -1);
> +
> +		if (all < 0) {
> +			all = fence;
> +			break;
> +		}

So... In case we're getting an error from previous sync_file_merge, we'll just
silently continue rather than fail? Or am I missing something here?

> +
> +		new = sync_fence_merge(all, fence);
> +		close(all);
> +		close(fence);
> +
> +		all = new;
> +	}
> +
> +	igt_assert(gem_bo_busy(fd, obj.handle));
> +	igt_assert(fence_busy(all));
> +
> +	timeout = 120;
> +	if ((flags & HANG) == 0) {

We're never passing HANG flag to this test.

-Michał

> +		*batch = MI_BATCH_BUFFER_END;
> +		__sync_synchronize();
> +		timeout = 1;
> +	}
> +	munmap(batch, 4096);
> +
> +	if (flags & WAIT) {
> +		struct pollfd pfd = { .fd = all, .events = POLLIN };
> +		igt_assert(poll(&pfd, 1, timeout*1000) == 1);
> +	} else {
> +		memset(&tv, 0, sizeof(tv));
> +		while (fence_busy(all))
> +			igt_assert(igt_seconds_elapsed(&tv) < timeout);
> +	}
> +
> +	igt_assert(!gem_bo_busy(fd, obj.handle));
> +	igt_assert_eq(sync_fence_status(all),
> +		      flags & HANG ? -EIO : SYNC_FENCE_OK);
> +
> +	close(all);
> +	gem_close(fd, obj.handle);
> +
> +	gem_quiescent_gpu(fd);
> +}
> +
>  static void test_fence_await(int fd, unsigned ring, unsigned flags)
>  {
>  	const int gen = intel_gen(intel_get_drm_devid(fd));
> @@ -744,6 +849,21 @@ igt_main
>  		caps = print_welcome(i915);
>  	}
>  
> +	igt_subtest_group {
> +		igt_fixture {
> +			igt_fork_hang_detector(i915);
> +		}
> +
> +		igt_subtest("basic-busy-all")
> +			test_fence_busy_all(i915, 0);
> +		igt_subtest("basic-wait-all")
> +			test_fence_busy_all(i915, WAIT);
> +
> +		igt_fixture {
> +			igt_stop_hang_detector();
> +		}
> +	}
> +
>  	for (e = intel_execution_engines; e->name; e++) {
>  		igt_subtest_group {
>  			igt_fixture {
> -- 
> 2.13.3
> 
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