[PATCH 6/7] reservation: add support for fences to enable cross-device synchronisation

[Maarten Lankhorst]

Signed-off-by: Maarten Lankhorst <maarten.lankho...@canonical.com>
---
 include/linux/reservation.h |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index 813dae960ebd..92c4851b5a39 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -6,7 +6,7 @@
  * Copyright (C) 2012 Texas Instruments
  *
  * Authors:
- * Rob Clark <rob.cl...@linaro.org>
+ * Rob Clark <robdcl...@gmail.com>
  * Maarten Lankhorst <maarten.lankho...@canonical.com>
  * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  *
@@ -40,22 +40,38 @@
 #define _LINUX_RESERVATION_H
 
 #include <linux/ww_mutex.h>
+#include <linux/fence.h>
 
 extern struct ww_class reservation_ww_class;
 
 struct reservation_object {
        struct ww_mutex lock;
+
+       struct fence *fence_excl;
+       struct fence **fence_shared;
+       u32 fence_shared_count, fence_shared_max;
 };
 
 static inline void
 reservation_object_init(struct reservation_object *obj)
 {
        ww_mutex_init(&obj->lock, &reservation_ww_class);
+
+       obj->fence_shared_count = obj->fence_shared_max = 0;
+       obj->fence_shared = NULL;
+       obj->fence_excl = NULL;
 }
 
 static inline void
 reservation_object_fini(struct reservation_object *obj)
 {
+       int i;
+
+       if (obj->fence_excl)
+               fence_put(obj->fence_excl);
+       for (i = 0; i < obj->fence_shared_count; ++i)
+               fence_put(obj->fence_shared[i]);
+
        ww_mutex_destroy(&obj->lock);
 }
 

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