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

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

On 17/05/2019 12:39, Andi Shyti wrote:
> 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).

Definitely yes, but coordinating all series seems tricky. I think best 
would be to consolidate once everything gets merged?

Regards,

Tvrtko
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