drm/gem: add support for private objects

[cascardo/linux.git] / drivers / gpu / drm / drm_gem.c

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 7c5b5f7..186d62e 100644 (file)
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -129,7 +129,7 @@ drm_gem_destroy(struct drm_device *dev)
 }
 
 /**
- * Initialize an already allocate GEM object of the specified size with
+ * Initialize an already allocated GEM object of the specified size with
  * shmfs backing store.
  */
 int drm_gem_object_init(struct drm_device *dev,
@@ -150,6 +150,27 @@ int drm_gem_object_init(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_gem_object_init);
 
+/**
+ * Initialize an already allocated GEM object of the specified size with
+ * no GEM provided backing store. Instead the caller is responsible for
+ * backing the object and handling it.
+ */
+int drm_gem_private_object_init(struct drm_device *dev,
+                       struct drm_gem_object *obj, size_t size)
+{
+       BUG_ON((size & (PAGE_SIZE - 1)) != 0);
+
+       obj->dev = dev;
+       obj->filp = NULL;
+
+       kref_init(&obj->refcount);
+       atomic_set(&obj->handle_count, 0);
+       obj->size = size;
+
+       return 0;
+}
+EXPORT_SYMBOL(drm_gem_private_object_init);
+
 /**
  * Allocate a GEM object of the specified size with shmfs backing store
  */
@@ -444,7 +465,8 @@ drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
 void
 drm_gem_object_release(struct drm_gem_object *obj)
 {
-       fput(obj->filp);
+       if (obj->filp)
+           fput(obj->filp);
 }
 EXPORT_SYMBOL(drm_gem_object_release);