linux-kernel - Re: [PATCH 2/3] drm/virtio: implement prime pin/unpin

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Date:   Wed, 27 Feb 2019 18:07:36 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     David Airlie <airlied@...ux.ie>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 2/3] drm/virtio: implement prime pin/unpin



Den 27.02.2019 15.44, skrev Gerd Hoffmann:
> virtio-gpu objects never move around, so effectively they are pinned
> all the time.  This makes the the implementation pretty easy ;)
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_prime.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
> index b4c9199349e7..0fcae0e46abd 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_prime.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
> @@ -30,13 +30,13 @@
>  
>  int virtgpu_gem_prime_pin(struct drm_gem_object *obj)
>  {
> -	WARN_ONCE(1, "not implemented");
> -	return -ENODEV;
> +	/* nothing: all virtio-gpu objects are pinned all the time */
> +	return 0;
>  }
>  
>  void virtgpu_gem_prime_unpin(struct drm_gem_object *obj)
>  {
> -	WARN_ONCE(1, "not implemented");
> +	/* nothing */
>  }

You can just remove these dummies the callbacks are optional. See
drm_gem_pin().

With that:

Reviewed-by: Noralf Trønnes <noralf@...nnes.org>

>  
>  void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
>