[Intel-gfx] [PATCH 4/9] drm/i915: Support for creating Stolen memory backed objects

[Chris Wilson]

> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index d727b49..ebce8c9 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -357,6 +357,7 @@ typedef struct drm_i915_irq_wait {
>  #define I915_PARAM_HAS_GPU_RESET	 35
>  #define I915_PARAM_HAS_RESOURCE_STREAMER 36
>  #define I915_PARAM_HAS_EXEC_SOFTPIN	 37
> +#define I915_PARAM_CREATE_VERSION	 38
>  
>  typedef struct drm_i915_getparam {
>  	__s32 param;
> @@ -456,6 +457,21 @@ struct drm_i915_gem_create {
>  	 */
>  	__u32 handle;
>  	__u32 pad;
> +	/**
> +	 * Requested flags (currently used for placement
> +	 * (which memory domain))
> +	 *
> +	 * You can request that the object be created from special memory
> +	 * rather than regular system pages using this parameter. Such
> +	 * irregular objects may have certain restrictions (such as CPU
> +	 * access to a stolen object is verboten).
> +	 *
> +	 * This can be used in the future for other purposes too
> +	 * e.g. specifying tiling/caching/madvise
> +	 */
> +	__u32 flags;
> +#define I915_CREATE_PLACEMENT_STOLEN 	(1<<0) /* Cannot use CPU mmaps */
> +#define __I915_CREATE_UNKNOWN_FLAGS	-(I915_CREATE_PLACEMENT_STOLEN << 1)

Alignment. sizeof(drm_i915_gem_create) must be aligned to u64 since we
contain u64 (to keep ABI compat for 32bit).
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre