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authorThomas Hellstrom <thellstrom@vmware.com>2012-11-06 11:31:50 +0000
committerDave Airlie <airlied@redhat.com>2012-11-20 16:15:05 +1000
commitcdad05216c2b2edfe92a9f87d6ae51aab277f3b2 (patch)
tree1ba899709b77745acec655d0a8eea3f08c97a885 /include/drm
parent4b20db3de8dab005b07c74161cb041db8c5ff3a7 (diff)
drm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3
The mostly used lookup+get put+potential_destroy path of TTM objects is converted to use RCU locks. This will substantially decrease the amount of locked bus cycles during normal operation. Since we use kfree_rcu to free the objects, no rcu synchronization is needed at module unload time. v2: Don't touch include/linux/kref.h v3: Adapt to kref_get_unless_zero return value change Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/ttm/ttm_object.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/drm/ttm/ttm_object.h b/include/drm/ttm/ttm_object.h
index b01c563b2751..fc0cf0649901 100644
--- a/include/drm/ttm/ttm_object.h
+++ b/include/drm/ttm/ttm_object.h
@@ -40,6 +40,7 @@
#include <linux/list.h>
#include <drm/drm_hashtab.h>
#include <linux/kref.h>
+#include <linux/rcupdate.h>
#include <ttm/ttm_memory.h>
/**
@@ -120,6 +121,7 @@ struct ttm_object_device;
*/
struct ttm_base_object {
+ struct rcu_head rhead;
struct drm_hash_item hash;
enum ttm_object_type object_type;
bool shareable;
@@ -268,4 +270,6 @@ extern struct ttm_object_device *ttm_object_device_init
extern void ttm_object_device_release(struct ttm_object_device **p_tdev);
+#define ttm_base_object_kfree(__object, __base)\
+ kfree_rcu(__object, __base.rhead)
#endif