Re: [PATCH 4/4] igt/gem_stolen: Verify contents of stolen-backed objects across hibernation

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 22/12/15 10:07, ankitprasad.r.sharma@intel.com wrote:
> From: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
>
> This patch verifies if the contents of the stolen backed object were
> preserved across hibernation. This is to validate kernel changes related
> to moving stolen-backed objects to shmem on hibernation.
>
> v2: Added comment, Use igt_assert_eq() instead of igt_assert(), Made loops
> more readable (Tvrtko)
>
> Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
> ---
>   tests/gem_stolen.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 98 insertions(+)
>
> diff --git a/tests/gem_stolen.c b/tests/gem_stolen.c
> index 5dc2117..8a0bcb7 100644
> --- a/tests/gem_stolen.c
> +++ b/tests/gem_stolen.c
> @@ -290,6 +290,101 @@ static void stolen_fill_purge_test(int fd)
>   		gem_close(fd, handle[i]);
>   }
>
> +static void stolen_hibernate(int fd)
> +{
> +	drm_intel_bo *bo;
> +	drm_intel_bo *src, *dest;
> +	int obj_count = 0, i = 0;
> +	int ret, j;
> +	uint32_t handle[MAX_OBJECTS], src_handle;
> +	uint32_t *virt;
> +
> +	gem_require_stolen_support(fd);
> +
> +	src_handle = gem_create(fd, SIZE);
> +	src = gem_handle_to_libdrm_bo(bufmgr, fd,
> +				     "bo", src_handle);
> +	igt_assert(src != NULL);
> +
> +	ret = drm_intel_gem_bo_map_gtt(src);
> +	igt_assert_eq(ret, 0);
> +
> +	virt = src->virtual;
> +	for (j = 0; j < SIZE/DWORD_SIZE; j++) {
> +		igt_assert_eq(virt[j], 0);
> +		virt[j] = j;
> +	}
> +
> +	drm_intel_bo_unmap(src);
> +	/* Exhaust Stolen space */
> +	for (i = 0; i < MAX_OBJECTS; i++) {
> +		handle[i] = __gem_create_stolen(fd, SIZE);
> +		if (!handle[i])
> +			break;
> +
> +		bo = gem_handle_to_libdrm_bo(bufmgr, fd,
> +					     "verify_bo", handle[i]);
> +		igt_assert(bo != NULL);
> +		ret = drm_intel_gem_bo_map_gtt(bo);
> +		igt_assert_eq(ret, 0);
> +
> +		virt = bo->virtual;
> +		for (j = 0; j < SIZE/DWORD_SIZE; j++)
> +			igt_assert_eq(virt[j], 0);
> +
> +		drm_intel_bo_unmap(bo);
> +		drm_intel_bo_unreference(bo);
> +
> +		obj_count++;
> +	}
> +
> +	/* Assert if atleast one object is allocated from stolen, that
> +	 * is good enough to verify the content preservation across
> +	 * hibernation.
> +	 */
> +	igt_assert(obj_count > 0);
> +
> +	/* Copy data to all stolen backed objects */
> +	for (i = 0; i < obj_count; i++) {
> +		dest = gem_handle_to_libdrm_bo(bufmgr, fd,
> +					       "dst_bo", handle[i]);
> +		igt_assert(dest != NULL);
> +		intel_copy_bo(batch, dest, src, SIZE);
> +		ret = drm_intel_gem_bo_map_gtt(dest);
> +		igt_assert_eq(ret, 0);
> +		virt = dest->virtual;
> +		for (j = 0; j < SIZE/DWORD_SIZE; j++)
> +			igt_assert_eq(virt[j], j);
> +
> +		drm_intel_bo_unmap(dest);
> +		drm_intel_bo_unreference(dest);
> +	}
> +
> +	drm_intel_bo_unreference(src);
> +
> +	igt_system_hibernate_autoresume();
> +	/* Check if the object's memory contents are intact
> +	 * across hibernation.
> +	 */
> +	for (i = 0; i < obj_count; i++) {
> +		bo = gem_handle_to_libdrm_bo(bufmgr, fd,
> +					     "verify_bo", handle[i]);
> +		igt_assert(bo != NULL);
> +		ret = drm_intel_gem_bo_map_gtt(bo);
> +		igt_assert_eq(ret, 0);
> +		virt = bo->virtual;
> +		for (j = 0; j < SIZE/DWORD_SIZE; j++)
> +			igt_assert_eq(virt[j], DATA);

How did it pass this assert?

I'll assume you actually ran the test and just managed to send the wrong 
version out. :)

> +
> +		drm_intel_bo_unmap(bo);
> +		drm_intel_bo_unreference(bo);
> +	}
> +
> +	gem_close(fd, src_handle);
> +	for (i = 0; i < obj_count; i++)
> +		gem_close(fd, handle[i]);
> +}
> +
>   static void
>   stolen_no_mmap(int fd)
>   {
> @@ -353,6 +448,9 @@ igt_main
>   	igt_subtest("stolen-fill-purge")
>   		stolen_fill_purge_test(fd);
>
> +	igt_subtest("stolen-hibernate")
> +		stolen_hibernate(fd);
> +
>   	igt_fixture {
>   		intel_batchbuffer_free(batch);
>   		drm_intel_bufmgr_destroy(bufmgr);
>

Fix the above assert and you can put:

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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