On Wed, Oct 10, 2018 at 09:14:50PM +0200, Noralf Trønnes wrote:
> Den 01.10.2018 09.46, skrev Daniel Vetter:
> > On Wed, Sep 26, 2018 at 04:59:32PM +0200, Noralf Trønnes wrote:
> > > +int drm_gem_shmem_prime_mmap(struct drm_gem_object *obj, struct
> > > vm_area_struct *vma)
> > > +{
> > > + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
> > > + int ret;
> > > +
> > > + ret = drm_gem_mmap_obj(obj, obj->size, vma);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + return drm_gem_shmem_mmap_obj(shmem, vma);
> > > +}
> > If we'd use the gem vma offset manager and adjust offsets and then call
> > into the gem mmap stuff I think we could make this 100% generic. That
> > would also avoid the need to add the gem_ops->prime_mmap callback, since
> > we'll have a default that should work for everyone.
>
> Is this what you had in mind?
>
> int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct
> *vma)
> {
> /* Used by drm_gem_mmap() to lookup the GEM object */
> struct drm_file priv = {
> .minor = obj->dev->primary,
> };
> struct file fil = {
> .private_data = &priv,
> };
> int ret;
>
> ret = drm_vma_node_allow(&obj->vma_node, &priv);
> if (ret)
> return ret;
>
> vma->vm_pgoff += drm_vma_node_start(&obj->vma_node);
Yup, this offset adjusting is what I had in mind.
-Daniel
> ret = obj->dev->driver->fops->mmap(&fil, vma);
>
> drm_vma_node_revoke(&obj->vma_node, &priv);
>
> return ret;
> }
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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