[PATCH 09/12] drm/amdgpu: disallow foreign BOs in the display path

[Alex Deucher]

On Mon, Jul 3, 2017 at 5:11 PM, Felix Kuehling <Felix.Kuehling at amd.com> wrote:
> From: Christian König <christian.koenig at amd.com>
>
> Pinning them in other devices VRAM would obviously not work.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>

Do we need to check in the DC (amdgpu_dm_types.c) and the dce
(dce_v*_0.c) code as well?

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> index 3341c34..bd6b0dc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> @@ -180,6 +180,12 @@ int amdgpu_crtc_page_flip_target(struct drm_crtc *crtc,
>         obj = new_amdgpu_fb->obj;
>         new_abo = gem_to_amdgpu_bo(obj);
>
> +       if (amdgpu_ttm_adev(new_abo->tbo.bdev) != adev) {
> +               DRM_ERROR("Foreign BOs not allowed in the display engine\n");
> +               r = -EINVAL;
> +               goto cleanup;
> +       }
> +
>         /* pin the new buffer */
>         r = amdgpu_bo_reserve(new_abo, false);
>         if (unlikely(r != 0)) {
> --
> 1.9.1
>
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