[Intel-gfx] [PATCH v2] drm/i915: fix i915_gem_object_wait_moving_fence

[Christian König]

Am 08.04.22 um 10:42 schrieb Matthew Auld:
> All of CI is just failing with the following, which prevents loading of
> the module:
>
>      i915 0000:03:00.0: [drm] *ERROR* Scratch setup failed
>
> Best guess is that this comes from the pin_map() for the scratch page,
> which does an i915_gem_object_wait_moving_fence() somewhere. It looks
> like this now calls into dma_resv_wait_timeout() which can return the
> remaining timeout, leading to the caller thinking this is an error.
>
> v2(Lucas): handle ret == 0
>
> Fixes: 1d7f5e6c5240 ("drm/i915: drop bo->moving dependency")
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Reviewed-by: Christian König <christian.koenig at amd.com> #v1

Reviewed-by: Christian König <christian.koenig at amd.com>

Should I push it to drm-misc-next?

> ---
>   drivers/gpu/drm/i915/gem/i915_gem_object.c | 11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> index 2998d895a6b3..747ac65e060f 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
> @@ -772,9 +772,16 @@ int i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj,
>   int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
>   				      bool intr)
>   {
> +	long ret;
> +
>   	assert_object_held(obj);
> -	return dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL,
> -				     intr, MAX_SCHEDULE_TIMEOUT);
> +
> +	ret = dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL,
> +				    intr, MAX_SCHEDULE_TIMEOUT);
> +	if (!ret)
> +		ret = -ETIME;
> +
> +	return ret < 0 ? ret : 0;
>   }
>   
>   #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)