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BACKPORT: drm/virtio: implement prime export

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Just run drm_prime_pages_to_sg() on the ttm pages list to get an
sg_table for export.  The pages list is created at object initialization
time, so there should be no need to handle an unpopulated page list.
Add a sanity check nevertheless.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20190227144441.6755-4-kraxel@redhat.com
(cherry picked from commit 98f41dc3b3)
Signed-off-by: Greg Hartman <ghartman@google.com>
BUG: 139386237
Change-Id: If0ab11829ec7a6166928e26b8f75e1510742493e
This commit is contained in:
Gerd Hoffmann
2019-02-27 15:44:41 +01:00
committed by Alistair Delva
parent a4be74b232
commit a4f8cf10cf
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/virtio/virtgpu_prime.c
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@@ -30,8 +30,14 @@
struct sg_table *virtgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
WARN_ONCE(1, "not implemented");
return ERR_PTR(-ENODEV);
struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
if (!bo->tbo.ttm->pages || !bo->tbo.ttm->num_pages)
/* should not happen */
return ERR_PTR(-EINVAL);
return drm_prime_pages_to_sg(bo->tbo.ttm->pages,
bo->tbo.ttm->num_pages);
}
struct drm_gem_object *virtgpu_gem_prime_import_sg_table(