[Intel-gfx] [igt-dev] [PATCH i-g-t 24/25] gem_wsim: Discover engines

[Andi Shyti]

Hi Tvrtko,

> +static int
> +__i915_query(int i915, struct drm_i915_query *q)
> +{
> +	if (igt_ioctl(i915, DRM_IOCTL_I915_QUERY, q))
> +		return -errno;
> +	return 0;
> +}
> +
> +static int
> +__i915_query_items(int i915, struct drm_i915_query_item *items, uint32_t n_items)
> +{
> +	struct drm_i915_query q = {
> +		.num_items = n_items,
> +		.items_ptr = to_user_pointer(items),
> +	};
> +	return __i915_query(i915, &q);
> +}
> +
> +static void
> +i915_query_items(int i915, struct drm_i915_query_item *items, uint32_t n_items)
> +{
> +	igt_assert_eq(__i915_query_items(i915, items, n_items), 0);
> +}
> +
> +static bool has_query(int i915)
> +{
> +	struct drm_i915_query query = {};
> +
> +	return __i915_query(i915, &query) == 0;
> +}
> +
> +static bool has_engine_query(int i915)
> +{
> +	struct drm_i915_query_item item = {
> +		.query_id = DRM_I915_QUERY_ENGINE_INFO,
> +	};
> +
> +	return __i915_query_items(i915, &item, 1) == 0 && item.length > 0;
> +}
> +
> +static void query_engines(void)
> +{

[...]

> +		struct drm_i915_query_engine_info *engine_info;
> +		struct drm_i915_query_item item = {
> +			.query_id = DRM_I915_QUERY_ENGINE_INFO,
> +		};
> +		const unsigned int sz = 4096;
> +		unsigned int i;
> +
> +		engine_info = malloc(sz);
> +		igt_assert(engine_info);
> +		memset(engine_info, 0, sz);
> +
> +		item.data_ptr = to_user_pointer(engine_info);
> +		item.length = sz;
> +
> +		i915_query_items(fd, &item, 1);
> +		igt_assert(item.length > 0);
> +		igt_assert(item.length <= sz);
> +
> +		num = engine_info->num_engines;
> +
> +		engines = calloc(num,
> +				 sizeof(struct i915_engine_class_instance));
> +		igt_assert(engines);
> +
> +		for (i = 0; i < num; i++) {
> +			struct drm_i915_engine_info *engine =
> +				(struct drm_i915_engine_info *)&engine_info->engines[i];
> +
> +			engines[i] = engine->engine;
> +		}
> +	}
> +
> +	__engines = engines;
> +	__num_engines = num;
> +}

would it make sense to make a library out of all the above? e.g.
gem_engine_topology does similar thing (all static functions like
here, though).

Andi