drm/gem: add drm_gem_create_mmap_offset_size()
Variant of drm_gem_create_mmap_offset() which doesn't make the
assumption that virtual size and physical size (obj->size) are the same.
This is needed in omapdrm to deal with tiled buffers. And lets us get
rid of a duplicated and slightly modified version of
drm_gem_create_mmap_offset() in omapdrm.
Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 9ab038c..a8ba7da 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -317,6 +317,31 @@
EXPORT_SYMBOL(drm_gem_free_mmap_offset);
/**
+ * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
+ * @obj: obj in question
+ * @size: the virtual size
+ *
+ * GEM memory mapping works by handing back to userspace a fake mmap offset
+ * it can use in a subsequent mmap(2) call. The DRM core code then looks
+ * up the object based on the offset and sets up the various memory mapping
+ * structures.
+ *
+ * This routine allocates and attaches a fake offset for @obj, in cases where
+ * the virtual size differs from the physical size (ie. obj->size). Otherwise
+ * just use drm_gem_create_mmap_offset().
+ */
+int
+drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size)
+{
+ struct drm_device *dev = obj->dev;
+ struct drm_gem_mm *mm = dev->mm_private;
+
+ return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node,
+ size / PAGE_SIZE);
+}
+EXPORT_SYMBOL(drm_gem_create_mmap_offset_size);
+
+/**
* drm_gem_create_mmap_offset - create a fake mmap offset for an object
* @obj: obj in question
*
@@ -327,14 +352,9 @@
*
* This routine allocates and attaches a fake offset for @obj.
*/
-int
-drm_gem_create_mmap_offset(struct drm_gem_object *obj)
+int drm_gem_create_mmap_offset(struct drm_gem_object *obj)
{
- struct drm_device *dev = obj->dev;
- struct drm_gem_mm *mm = dev->mm_private;
-
- return drm_vma_offset_add(&mm->vma_manager, &obj->vma_node,
- obj->size / PAGE_SIZE);
+ return drm_gem_create_mmap_offset_size(obj, obj->size);
}
EXPORT_SYMBOL(drm_gem_create_mmap_offset);