drm: GEM mmap support

Add core support for mapping of GEM objects.  Drivers should provide a
vm_operations_struct if they want to support page faulting of objects.
The code for handling GEM object offsets was taken from TTM, which was
written by Thomas Hellström.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index dc3ce3e0a0a4..7fb690bcd492 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -262,6 +262,9 @@ static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
                 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
 
                 break;
+        case _DRM_GEM:
+                DRM_ERROR("tried to rmmap GEM object\n");
+                break;
         }
         case _DRM_SCATTER_GATHER:
                 if (!dev->sg) {
@@ -429,6 +432,9 @@ int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
                 dmah.size = map->size;
                 __drm_pci_free(dev, &dmah);
                 break;
+        case _DRM_GEM:
+                DRM_ERROR("tried to rmmap GEM object\n");
+                break;
         }
         drm_free(map, sizeof(*map), DRM_MEM_MAPS);