WebSVN – Kolibri OS – Blame – /drivers/include/linux/reservation.h

Rev	Author	Line No.	Line
5056	serge	1	/*
		2	* Header file for reservations for dma-buf and ttm
		3	*
		4	* Copyright(C) 2011 Linaro Limited. All rights reserved.
		5	* Copyright (C) 2012-2013 Canonical Ltd
		6	* Copyright (C) 2012 Texas Instruments
		7	*
		8	* Authors:
		9	* Rob Clark
		10	* Maarten Lankhorst
		11	* Thomas Hellstrom
		12	*
		13	* Based on bo.c which bears the following copyright notice,
		14	* but is dual licensed:
		15	*
		16	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
		17	* All Rights Reserved.
		18	*
		19	* Permission is hereby granted, free of charge, to any person obtaining a
		20	* copy of this software and associated documentation files (the
		21	* "Software"), to deal in the Software without restriction, including
		22	* without limitation the rights to use, copy, modify, merge, publish,
		23	* distribute, sub license, and/or sell copies of the Software, and to
		24	* permit persons to whom the Software is furnished to do so, subject to
		25	* the following conditions:
		26	*
		27	* The above copyright notice and this permission notice (including the
		28	* next paragraph) shall be included in all copies or substantial portions
		29	* of the Software.
		30	*
		31	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		32	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		33	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
		34	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
		35	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
		36	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
		37	* USE OR OTHER DEALINGS IN THE SOFTWARE.
		38	*/
		39	#ifndef _LINUX_RESERVATION_H
		40	#define _LINUX_RESERVATION_H
		41
		42	#include
5270	serge	43	#include
		44	#include
		45	#include
		46	#include
5056	serge	47
		48	extern struct ww_class reservation_ww_class;
5270	serge	49	extern struct lock_class_key reservation_seqcount_class;
		50	extern const char reservation_seqcount_string[];
5056	serge	51
5270	serge	52	struct reservation_object_list {
		53	struct rcu_head rcu;
		54	u32 shared_count, shared_max;
		55	struct fence __rcu *shared[];
		56	};
		57
5056	serge	58	struct reservation_object {
		59	struct ww_mutex lock;
5270	serge	60	seqcount_t seq;
		61
		62	struct fence __rcu *fence_excl;
		63	struct reservation_object_list __rcu *fence;
		64	struct reservation_object_list *staged;
5056	serge	65	};
		66
5270	serge	67	#define reservation_object_held(obj) lockdep_is_held(&(obj)->lock.base)
		68	#define reservation_object_assert_held(obj) \
		69	lockdep_assert_held(&(obj)->lock.base)
		70
5056	serge	71	static inline void
		72	reservation_object_init(struct reservation_object *obj)
		73	{
		74	ww_mutex_init(&obj->lock, &reservation_ww_class);
5270	serge	75
		76	__seqcount_init(&obj->seq, reservation_seqcount_string, &reservation_seqcount_class);
		77	RCU_INIT_POINTER(obj->fence, NULL);
		78	RCU_INIT_POINTER(obj->fence_excl, NULL);
		79	obj->staged = NULL;
5056	serge	80	}
		81
		82	static inline void
		83	reservation_object_fini(struct reservation_object *obj)
		84	{
5270	serge	85	int i;
		86	struct reservation_object_list *fobj;
		87	struct fence *excl;
		88
		89	/*
		90	* This object should be dead and all references must have
		91	* been released to it, so no need to be protected with rcu.
		92	*/
		93	excl = rcu_dereference_protected(obj->fence_excl, 1);
		94	if (excl)
		95	fence_put(excl);
		96
		97	fobj = rcu_dereference_protected(obj->fence, 1);
		98	if (fobj) {
		99	for (i = 0; i < fobj->shared_count; ++i)
		100	fence_put(rcu_dereference_protected(fobj->shared[i], 1));
		101
		102	kfree(fobj);
		103	}
		104	kfree(obj->staged);
		105
5056	serge	106	ww_mutex_destroy(&obj->lock);
		107	}
		108
5270	serge	109	static inline struct reservation_object_list *
		110	reservation_object_get_list(struct reservation_object *obj)
		111	{
		112	return rcu_dereference_protected(obj->fence,
		113	reservation_object_held(obj));
		114	}
		115
		116	static inline struct fence *
		117	reservation_object_get_excl(struct reservation_object *obj)
		118	{
		119	return rcu_dereference_protected(obj->fence_excl,
		120	reservation_object_held(obj));
		121	}
		122
		123	int reservation_object_reserve_shared(struct reservation_object *obj);
		124	void reservation_object_add_shared_fence(struct reservation_object *obj,
		125	struct fence *fence);
		126
		127	void reservation_object_add_excl_fence(struct reservation_object *obj,
		128	struct fence *fence);
		129
		130	int reservation_object_get_fences_rcu(struct reservation_object *obj,
		131	struct fence **pfence_excl,
		132	unsigned *pshared_count,
		133	struct fence ***pshared);
		134
		135	long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
		136	bool wait_all, bool intr,
		137	unsigned long timeout);
		138
		139	bool reservation_object_test_signaled_rcu(struct reservation_object *obj,
		140	bool test_all);
		141
5056	serge	142	#endif /* _LINUX_RESERVATION_H */

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(root)/drivers/include/linux/reservation.h – Rev 5270