On Thu, May 14, 2020 at 09:23:37AM +0200, Thomas Zimmermann wrote: > Hi > > 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@xxxxxxxxxx> > > Cc: Rob Herring <robh@xxxxxxxxxx> > > Cc: Noralf Trønnes <noralf@xxxxxxxxxxx> > > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> > > --- > > 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); > > + > > Just a question: how does it work with the fake value in vm_pgoffset? > The offset is a DRM-specific thing and the dma-buf exporter expects the > real offset? For drm chardev file descriptor we have one file, but want to let userspace map arbitrary objects. So an object gets a allocated an area within the over drm mmap space, this fake offset. For dma-buf mmap otoh there's a 1:1 mapping between fd and object, so no additional offset needed. -Daniel > > With this question clarified: > > Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx> > > > > 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 http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
