[Mesa-dev] [Intel-gfx] [PATCH] drm/i915: Add I915_PARAM_MMAP_GTT_VERSION to advertise unlimited mmaps

[Joonas Lahtinen]

On ke, 2016-08-24 at 20:42 +0100, Chris Wilson wrote:
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -355,6 +355,14 @@ static int i915_getparam(struct drm_device *dev, void *data,
>  	case I915_PARAM_MIN_EU_IN_POOL:
>  		value = INTEL_INFO(dev)->min_eu_in_pool;
>  		break;
> +	case I915_PARAM_MMAP_GTT_VERSION:
> +		/* 0 - Objects have to be smaller than aperture,
> +		 *     all simultaneous users have to fit within the
> +		 *     available space within the aperture.
> +		 * 1 - Objects can any size, and X,Y or untiled
> +		 */
> +		value = 1;

The actual test would be if this function call succeeds, though.

value = 0 would never be returned, so I'm not sure it'll be useful to
document as such. So I might document as "Failure to execute the query
means..."

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation