[PATCH] drm/amdgpu: set f_mapping on exported DMA-bufs

[Alex Deucher]

On Tue, Nov 14, 2017 at 7:13 AM, Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
> Otherwise we can't correctly CPU map TTM buffers.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
> index 90af8e82b16a..ae9c106979d7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
> @@ -169,10 +169,14 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
>                                         int flags)
>  {
>         struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
> +       struct dma_buf *buf;
>
>         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
>             bo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
>                 return ERR_PTR(-EPERM);
>
> -       return drm_gem_prime_export(dev, gobj, flags);
> +       buf = drm_gem_prime_export(dev, gobj, flags);
> +       if (!IS_ERR(buf))
> +               buf->file->f_mapping = dev->anon_inode->i_mapping;
> +       return buf;
>  }
> --
> 2.11.0
>
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