drm/exynos: add iommu support for g2d

Chagelog v2:
removed unnecessary structure, struct g2d_gem_node.

Chagelog v1:
This patch adds iommu support for g2d driver. For this, it
adds subdrv_probe/remove callback to enable or disable
g2d iommu. And with this patch, in case of using g2d iommu,
we can get or put device address to a gem handle from user
through exynos_drm_gem_get/put_dma_addr(). Actually, these
functions take a reference to a gem handle so that the gem
object used by g2d dma is released properly.

And runqueue_node has a pointer to drm_file object of current
process to manage gem handles to owner.

This patch is based on the below patch set, "drm/exynos: add
iommu support for -next".
     http://www.spinics.net/lists/dri-devel/msg29041.html

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h b/drivers/gpu/drm/exynos/exynos_drm_gem.h
index 0236321521a1..83d21ef1d1e9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
@@ -105,9 +105,9 @@ int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
  * other drivers such as 2d/3d acceleration drivers.
  * with this function call, gem object reference count would be increased.
  */
-void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
+dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
                                         unsigned int gem_handle,
-                                        struct drm_file *file_priv);
+                                        struct drm_file *filp);
 
 /*
  * put dma address from gem handle and this function could be used for
@@ -116,7 +116,7 @@ void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
  */
 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
                                         unsigned int gem_handle,
-                                        struct drm_file *file_priv);
+                                        struct drm_file *filp);
 
 /* get buffer offset to map to user space. */
 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,