[Intel-gfx] [PATCH i-g-t v2 2/2] tests/gem_mmap_gtt: add huge BO test

[Chris Wilson]

On Wed, Apr 08, 2015 at 01:51:52PM +0300, Joonas Lahtinen wrote:
> +	/* Test read/write to first/last page through CPU after GTT writes.
> +	 * Require that previous GTT written values still exist.
> +	 */
> +	ptr_cpu = gem_mmap__cpu(fd, bo, 0, huge_object_size,
> +				PROT_READ | PROT_WRITE);
> +	if (!ptr_cpu) {
> +		igt_warn("Not enough free memory to complete huge BO test!\n");
> +		goto out;
> +	}
> +
> +	set_domain_cpu(fd, bo);
> +
> +	igt_assert(memcmp(ptr_cpu              , gtt_pattern, PAGE_SIZE) == 0);
> +	igt_assert(memcmp(ptr_cpu + last_offset, gtt_pattern, PAGE_SIZE) == 0);
> +
> +	memcpy(ptr_cpu, cpu_pattern, PAGE_SIZE);
> +	igt_assert(memcmp(ptr_cpu              , cpu_pattern, PAGE_SIZE) == 0);
> +	igt_assert(memcmp(ptr_cpu + last_offset, gtt_pattern, PAGE_SIZE) == 0);
> +
> +	memcpy(ptr_cpu + last_offset, cpu_pattern, PAGE_SIZE);
> +	igt_assert(memcmp(ptr_cpu              , cpu_pattern, PAGE_SIZE) == 0);
> +	igt_assert(memcmp(ptr_cpu + last_offset, cpu_pattern, PAGE_SIZE) == 0);

On second thought I think this is better using pread as on non-llc
platforms this will a second gigantic clflush. Otherwise lgtm.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre