linux-kernel - Re: [PATCH v2 06/12] drm/virtio: remove ttm calls from in virtio_gpu_object

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Date:   Tue, 18 Jun 2019 16:09:25 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/12] drm/virtio: remove ttm calls from in
 virtio_gpu_object_{reserve,unreserve}

On Tue, Jun 18, 2019 at 03:58:14PM +0200, Gerd Hoffmann wrote:
> Call reservation_object_* directly instead
> of using ttm_bo_{reserve,unreserve}.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_drv.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index 06cc0e961df6..91c320819a8c 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -402,7 +402,7 @@ static inline int virtio_gpu_object_reserve(struct virtio_gpu_object *bo)
>  {
>  	int r;
>  
> -	r = ttm_bo_reserve(&bo->tbo, true, false, NULL);
> +	r = reservation_object_lock_interruptible(bo->gem_base.resv, NULL);
>  	if (unlikely(r != 0)) {
>  		if (r != -ERESTARTSYS) {

errno semantics change here, I think you now get EINTR. With that fixed:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

>  			struct virtio_gpu_device *qdev =
> @@ -416,7 +416,7 @@ static inline int virtio_gpu_object_reserve(struct virtio_gpu_object *bo)
>  
>  static inline void virtio_gpu_object_unreserve(struct virtio_gpu_object *bo)
>  {
> -	ttm_bo_unreserve(&bo->tbo);
> +	reservation_object_unlock(bo->gem_base.resv);
>  }
>  
>  /* virgl debufs */
> -- 
> 2.18.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch