[Intel-gfx] [PATCH 7/9] drm/shmem-helpers: Redirect mmap for imported dma-buf

[Daniel Vetter]

On Wed, May 27, 2020 at 8:32 PM Thomas Zimmermann <tzimmermann at suse.de> wrote:
>
> Hi Daniel,
>
> what's your plan for this patch set? I'd need this patch for the udl
> shmem cleanup.

I was pinging some people for a tested-by, I kinda don't want to push
this entirely untested. I think at least one of the rendering drivers
using shmem would be nice to run this on, I've pinged Rob Herring a
bit.
-Daniel

>
> Best regards
> Thomas
>
> Am 11.05.20 um 11:35 schrieb Daniel Vetter:
> > Currently this seems to work by converting the sgt into a pages array,
> > and then treating it like a native object. Do the right thing and
> > redirect mmap to the exporter.
> >
> > With this nothing is calling get_pages anymore on imported dma-buf,
> > and we can start to remove the use of the ->pages array for that case.
> >
> > v2: Rebase
> >
> > Cc: Gerd Hoffmann <kraxel at redhat.com>
> > Cc: Rob Herring <robh at kernel.org>
> > Cc: Noralf Trønnes <noralf at tronnes.org>
> > Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> > ---
> >  drivers/gpu/drm/drm_gem_shmem_helper.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> > index b9cba5cc61c3..117a7841e284 100644
> > --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> > +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> > @@ -551,6 +551,9 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
> >       /* Remove the fake offset */
> >       vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
> >
> > +     if (obj->import_attach)
> > +             return dma_buf_mmap(obj->dma_buf, vma, 0);
> > +
> >       shmem = to_drm_gem_shmem_obj(obj);
> >
> >       ret = drm_gem_shmem_get_pages(shmem);
> >
>
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Geschäftsführer: Felix Imendörffer
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch