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

Daniel Vetter daniel.vetter at ffwll.ch
Mon May 11 09:35:52 UTC 2020

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);

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