[PATCH v2 2/2] drm: share address space for dma bufs

[Alex Deucher]

On Fri, Nov 22, 2019 at 4:17 AM Daniel Vetter <daniel at ffwll.ch> wrote:
>
> On Fri, Nov 22, 2019 at 7:37 AM Gerd Hoffmann <kraxel at redhat.com> wrote:
> >
> > Use the shared address space of the drm device (see drm_open() in
> > drm_file.c) for dma-bufs too.  That removes a difference betweem drm
> > device mmap vmas and dma-buf mmap vmas and fixes corner cases like
> > dropping ptes (using madvise(DONTNEED) for example) not working
> > properly.
> >
> > Also remove amdgpu driver's private dmabuf update.  It is not needed
> > any more now that we are doing this for everybody.
> >
> > Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
>
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>
> But I think you want at least an ack from amd guys for double checking here.
> -Daniel

Looks correct to me.

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


> > ---
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 4 +---
> >  drivers/gpu/drm/drm_prime.c                 | 4 +++-
> >  2 files changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> > index d5bcdfefbad6..586db4fb46bd 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> > @@ -361,10 +361,8 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_gem_object *gobj,
> >                 return ERR_PTR(-EPERM);
> >
> >         buf = drm_gem_prime_export(gobj, flags);
> > -       if (!IS_ERR(buf)) {
> > -               buf->file->f_mapping = gobj->dev->anon_inode->i_mapping;
> > +       if (!IS_ERR(buf))
> >                 buf->ops = &amdgpu_dmabuf_ops;
> > -       }
> >
> >         return buf;
> >  }
> > diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> > index a9633bd241bb..c3fc341453c0 100644
> > --- a/drivers/gpu/drm/drm_prime.c
> > +++ b/drivers/gpu/drm/drm_prime.c
> > @@ -240,6 +240,7 @@ void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv)
> >  struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
> >                                       struct dma_buf_export_info *exp_info)
> >  {
> > +       struct drm_gem_object *obj = exp_info->priv;
> >         struct dma_buf *dma_buf;
> >
> >         dma_buf = dma_buf_export(exp_info);
> > @@ -247,7 +248,8 @@ struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
> >                 return dma_buf;
> >
> >         drm_dev_get(dev);
> > -       drm_gem_object_get(exp_info->priv);
> > +       drm_gem_object_get(obj);
> > +       dma_buf->file->f_mapping = obj->dev->anon_inode->i_mapping;
> >
> >         return dma_buf;
> >  }
> > --
> > 2.18.1
> >
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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