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-rw-r--r--kernel/include/linux/reservation.h142
1 files changed, 142 insertions, 0 deletions
diff --git a/kernel/include/linux/reservation.h b/kernel/include/linux/reservation.h
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+++ b/kernel/include/linux/reservation.h
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+/*
+ * Header file for reservations for dma-buf and ttm
+ *
+ * Copyright(C) 2011 Linaro Limited. All rights reserved.
+ * Copyright (C) 2012-2013 Canonical Ltd
+ * Copyright (C) 2012 Texas Instruments
+ *
+ * Authors:
+ * Rob Clark <robdclark@gmail.com>
+ * Maarten Lankhorst <maarten.lankhorst@canonical.com>
+ * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ *
+ * Based on bo.c which bears the following copyright notice,
+ * but is dual licensed:
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef _LINUX_RESERVATION_H
+#define _LINUX_RESERVATION_H
+
+#include <linux/ww_mutex.h>
+#include <linux/fence.h>
+#include <linux/slab.h>
+#include <linux/seqlock.h>
+#include <linux/rcupdate.h>
+
+extern struct ww_class reservation_ww_class;
+extern struct lock_class_key reservation_seqcount_class;
+extern const char reservation_seqcount_string[];
+
+struct reservation_object_list {
+ struct rcu_head rcu;
+ u32 shared_count, shared_max;
+ struct fence __rcu *shared[];
+};
+
+struct reservation_object {
+ struct ww_mutex lock;
+ seqcount_t seq;
+
+ struct fence __rcu *fence_excl;
+ struct reservation_object_list __rcu *fence;
+ struct reservation_object_list *staged;
+};
+
+#define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base)
+#define reservation_object_assert_held(obj) \
+ lockdep_assert_held(&(obj)->lock.base)
+
+static inline void
+reservation_object_init(struct reservation_object *obj)
+{
+ ww_mutex_init(&obj->lock, &reservation_ww_class);
+
+ __seqcount_init(&obj->seq, reservation_seqcount_string, &reservation_seqcount_class);
+ RCU_INIT_POINTER(obj->fence, NULL);
+ RCU_INIT_POINTER(obj->fence_excl, NULL);
+ obj->staged = NULL;
+}
+
+static inline void
+reservation_object_fini(struct reservation_object *obj)
+{
+ int i;
+ struct reservation_object_list *fobj;
+ struct fence *excl;
+
+ /*
+ * This object should be dead and all references must have
+ * been released to it, so no need to be protected with rcu.
+ */
+ excl = rcu_dereference_protected(obj->fence_excl, 1);
+ if (excl)
+ fence_put(excl);
+
+ fobj = rcu_dereference_protected(obj->fence, 1);
+ if (fobj) {
+ for (i = 0; i < fobj->shared_count; ++i)
+ fence_put(rcu_dereference_protected(fobj->shared[i], 1));
+
+ kfree(fobj);
+ }
+ kfree(obj->staged);
+
+ ww_mutex_destroy(&obj->lock);
+}
+
+static inline struct reservation_object_list *
+reservation_object_get_list(struct reservation_object *obj)
+{
+ return rcu_dereference_protected(obj->fence,
+ reservation_object_held(obj));
+}
+
+static inline struct fence *
+reservation_object_get_excl(struct reservation_object *obj)
+{
+ return rcu_dereference_protected(obj->fence_excl,
+ reservation_object_held(obj));
+}
+
+int reservation_object_reserve_shared(struct reservation_object *obj);
+void reservation_object_add_shared_fence(struct reservation_object *obj,
+ struct fence *fence);
+
+void reservation_object_add_excl_fence(struct reservation_object *obj,
+ struct fence *fence);
+
+int reservation_object_get_fences_rcu(struct reservation_object *obj,
+ struct fence **pfence_excl,
+ unsigned *pshared_count,
+ struct fence ***pshared);
+
+long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
+ bool wait_all, bool intr,
+ unsigned long timeout);
+
+bool reservation_object_test_signaled_rcu(struct reservation_object *obj,
+ bool test_all);
+
+#endif /* _LINUX_RESERVATION_H */