[PATCH] drm/gem: add hooks to notify driver when object handle is created/destroyed

[skeg...@gmail.com]

From: Ben Skeggs <bske...@redhat.com>

Nouveau is going to use these hooks to map/unmap objects from a client's
private GPU address space.

Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
---
 drivers/gpu/drm/drm_gem.c |   21 +++++++++++++++++++--
 include/drm/drmP.h        |    2 ++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 74e4ff5..bad3359 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -210,6 +210,8 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
        idr_remove(&filp->object_idr, handle);
        spin_unlock(&filp->table_lock);

+       if (dev->driver->gem_close_object)
+               dev->driver->gem_close_object(obj, filp);
        drm_gem_object_handle_unreference_unlocked(obj);

        return 0;
@@ -226,7 +228,8 @@ drm_gem_handle_create(struct drm_file *file_priv,
                       struct drm_gem_object *obj,
                       u32 *handlep)
 {
-       int     ret;
+       struct drm_device *dev = obj->dev;
+       int ret;

        /*
         * Get the user-visible handle using idr.
@@ -247,6 +250,15 @@ again:
                return ret;

        drm_gem_object_handle_reference(obj);
+
+       if (dev->driver->gem_open_object) {
+               ret = dev->driver->gem_open_object(obj, file_priv);
+               if (ret) {
+                       drm_gem_handle_delete(file_priv, *handlep);
+                       return ret;
+               }
+       }
+
        return 0;
 }
 EXPORT_SYMBOL(drm_gem_handle_create);
@@ -401,7 +413,12 @@ drm_gem_open(struct drm_device *dev, struct drm_file 
*file_private)
 static int
 drm_gem_object_release_handle(int id, void *ptr, void *data)
 {
+       struct drm_file *file_priv = data;
        struct drm_gem_object *obj = ptr;
+       struct drm_device *dev = obj->dev;
+
+       if (dev->driver->gem_close_object)
+               dev->driver->gem_close_object(obj, file_priv);

        drm_gem_object_handle_unreference_unlocked(obj);

@@ -417,7 +434,7 @@ void
 drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
 {
        idr_for_each(&file_private->object_idr,
-                    &drm_gem_object_release_handle, NULL);
+                    &drm_gem_object_release_handle, file_private);

        idr_remove_all(&file_private->object_idr);
        idr_destroy(&file_private->object_idr);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 738b3a5..4912cb7 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -886,6 +886,8 @@ struct drm_driver {
         */
        int (*gem_init_object) (struct drm_gem_object *obj);
        void (*gem_free_object) (struct drm_gem_object *obj);
+       int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
+       void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);

        /* vga arb irq handler */
        void (*vgaarb_irq)(struct drm_device *dev, bool state);
-- 
1.7.5.2