[Intel-gfx] [PATCH 2/2] drm/i915: Avoid decomposing a signal-on-any fence-array

[Joonas Lahtinen]

On pe, 2017-02-17 at 18:35 +0000, Chris Wilson wrote:
> The code currently assumes that all fence arrays it sees are the normal
> signal-on-all variety, and decomposes the array into its individual
> fences so that it can extract the native i915 fences. If the fence array
> is using signal-on-any, we should not decompose as we must not wait on
> them all, just the first in *that* set.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> CC: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

<SNIP>

> 
> @@ -696,7 +696,8 @@ i915_gem_request_await_dma_fence(struct drm_i915_gem_request *req,
>  	if (dma_fence_is_i915(fence))
>  		return i915_gem_request_await_request(req, to_request(fence));
>  
> -	if (!dma_fence_is_array(fence)) {
> +	if (!dma_fence_is_array(fence) ||
> +	    test_bit(DMA_FENCE_ARRAY_SIGNAL_ANY, &fence->flags)) {

Smells like a helper function? While that helper is finding the way
upstream;

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

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