Quoting Tvrtko Ursulin (2017-10-27 14:40:12)
> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
>
> We have to reject unknown flags for uAPI considerations, and also
> because the curent implementation limits their i915 storage space
> to two bits.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Fixes: cf6e7bac6357 ("drm/i915: Add support for drm syncobjs")
> Cc: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> ---
> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> index 3d7190764f10..3bc723ed6e2f 100644
> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> @@ -2100,6 +2100,11 @@ get_fence_array(struct drm_i915_gem_execbuffer2 *args,
> goto err;
> }
>
Make the test explicit for the abi:
> + if (fence.flags & ~((typeof(fence.flags))2)) {
s/2/3/!
if (fence.flags & ~(I915_EXEC_FENCE_WAIT | I915_EXEC_FENCE_SIGNAL)) {
> + err = -EINVAL;
> + goto err;
> + }
> +
BUILD_BUG_ON((I915_EXEC_FENCE_WAIT | I915_EXEC_FENCE_SIGNAL)) & ~(alignof(void *)-1)) ?
#define I915_EXEC_FENCE_FLAGS ... ?
-Chris
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