Re: [PATCH] tests/gem_reset_stats: add defer-hangcheck test

[Daniel Vetter <daniel@ffwll.ch>]

On Fri, Nov 07, 2014 at 05:20:48PM +0200, Mika Kuoppala wrote:
> to see if one can fool hangcheck by keeping non hanging
> ring busy
> 
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
> ---
>  tests/gem_reset_stats.c | 43 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/tests/gem_reset_stats.c b/tests/gem_reset_stats.c
> index 3f5a01f..6473cf3 100644
> --- a/tests/gem_reset_stats.c
> +++ b/tests/gem_reset_stats.c
> @@ -1019,6 +1019,45 @@ static void test_params(void)
>  
>  }
>  
> +static void defer_hangcheck(int ring_num)
> +{
> +	int fd, count_start, count_end;
> +	int seconds = 30;
> +	const struct target_ring *next_ring;
> +	fd = drm_open_any();
> +	igt_assert(fd >= 0);
> +
> +	do {
> +		next_ring = &rings[(++ring_num) % NUM_RINGS];
> +
> +		if (next_ring->present(fd))
> +			break;
> +
> +	} while(next_ring != current_ring);
> +
> +	igt_skip_on(next_ring == current_ring);
> +
> +	count_start = get_reset_count(fd, 0);
> +	igt_assert(count_start >= 0);
> +
> +	igt_assert(inject_hang_ring(fd, 0, current_ring->exec, true));
> +	while (--seconds) {
> +		igt_assert(exec_valid_ring(fd, 0, next_ring->exec));
> +
> +		count_end = get_reset_count(fd, 0);
> +		igt_assert(count_end >= 0);
> +
> +		if (count_end > count_start)
> +			return;

s/return/break/ here? Otherwise lgtm, pls push with that fixed.
-Daniel

> +
> +		sleep(1);
> +	}
> +
> +	igt_assert(count_end > count_start);
> +
> +	close(fd);
> +}
> +
>  static bool gem_has_hw_contexts(int fd)
>  {
>  	struct local_drm_i915_gem_context_create create;
> @@ -1159,5 +1198,9 @@ igt_main
>  
>  		igt_subtest_f("close-pending-fork-reverse-%s", name)
>  			RUN_TEST(test_close_pending_fork(true));
> +
> +		igt_subtest_f("defer-hangcheck-%s", name)
> +			RUN_TEST(defer_hangcheck(i));
> +
>  	}
>  }
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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