[PATCH] drm/amdgpu: don't allow userspace to create a doorbell BO

[Felix Kuehling]

Am 2023-08-09 um 15:09 schrieb Alex Deucher:
> We need the domains in amdgpu_drm.h for the kernel driver to manage
> the pool, but we don't want userspace using it until the code
> is ready.  So reject for now.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Acked-by: Felix Kuehling <Felix.Kuehling at amd.com>


> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> index 693b1fd1191a..ca4d2d430e28 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> @@ -289,6 +289,10 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
>   	uint32_t handle, initial_domain;
>   	int r;
>   
> +	/* reject DOORBELLs until userspace code to use it is available */
> +	if (args->in.domains & AMDGPU_GEM_DOMAIN_DOORBELL)
> +		return -EINVAL;
> +
>   	/* reject invalid gem flags */
>   	if (flags & ~(AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
>   		      AMDGPU_GEM_CREATE_NO_CPU_ACCESS |