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_drv.c b/drivers/gpu/drm/drm_drv.c
index 9f04ca37df6d..98a781375f60 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -209,6 +209,7 @@ int drm_lastclose(struct drm_device * dev)
         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
                 drm_dma_takedown(dev);
 
+        dev->dev_mapping = NULL;
         mutex_unlock(&dev->struct_mutex);
 
         DRM_DEBUG("lastclose completed\n");
@@ -273,6 +274,8 @@ EXPORT_SYMBOL(drm_init);
  */
 static void drm_cleanup(struct drm_device * dev)
 {
+        struct drm_driver *driver = dev->driver;
+
         DRM_DEBUG("\n");
 
         if (!dev) {
@@ -304,6 +307,9 @@ static void drm_cleanup(struct drm_device * dev)
         drm_ht_remove(&dev->map_hash);
         drm_ctxbitmap_cleanup(dev);
 
+        if (driver->driver_features & DRIVER_GEM)
+                drm_gem_destroy(dev);
+
         drm_put_minor(&dev->primary);
         if (drm_put_dev(dev))
                 DRM_ERROR("Cannot unload module\n");