Linux Virtualization - Feb 2019 - [PATCH 2/3] drm/virtio: implement prime pin/unpin

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 at redhat.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 */
 }
 
 void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
-- 
2.9.3

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 at redhat.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 Tr?nnes <noralf at tronnes.org>
>  
>  void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
>