On Mon, Aug 07, 2017 at 12:43:58PM +0100, Chris Wilson wrote:
> This was supposed to be a mask of all known rings, but it is being used
> by execbuffer to filter out invalid rings, and so is instead mapping high
> unused values onto valid rings. Instead of a mask of all known rings,
> we need it to be the mask of all possible rings.
>
> Fixes: 549f7365820a ("drm/i915: Enable SandyBridge blitter ring")
> Fixes: de1add360522 ("drm/i915: Decouple execbuf uAPI from internal implementation")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.6+
Do we have an evil gem_exec_params subtest that blows up here? Since it
aliases as-is, should be easy to write one ...
-Daniel
> ---
> include/uapi/drm/i915_drm.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index e6b8ae712ae3..b20e41fd2062 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -907,7 +907,7 @@ struct drm_i915_gem_execbuffer2 {
> * struct drm_i915_gem_exec_fence *fences.
> */
> __u64 cliprects_ptr;
> -#define I915_EXEC_RING_MASK (7<<0)
> +#define I915_EXEC_RING_MASK (0x3f)
> #define I915_EXEC_DEFAULT (0<<0)
> #define I915_EXEC_RENDER (1<<0)
> #define I915_EXEC_BSD (2<<0)
> --
> 2.13.3
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch