[net-next-2.6.git] / include / rdma / ib_umem.h

/*
 * Copyright (c) 2007 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * 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
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * 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 IB_UMEM_H
#define IB_UMEM_H

#include <linux/list.h>
#include <linux/scatterlist.h>
#include <linux/workqueue.h>

struct ib_ucontext;

struct ib_umem {
	struct ib_ucontext     *context;
	size_t			length;
	int			offset;
	int			page_size;
	int                     writable;
	int                     hugetlb;
	struct list_head	chunk_list;
	struct work_struct	work;
	struct mm_struct       *mm;
	unsigned long		diff;
};

struct ib_umem_chunk {
	struct list_head	list;
	int                     nents;
	int                     nmap;
	struct scatterlist      page_list[0];
};

#ifdef CONFIG_INFINIBAND_USER_MEM

struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
			    size_t size, int access, int dmasync);
void ib_umem_release(struct ib_umem *umem);
int ib_umem_page_count(struct ib_umem *umem);

#else /* CONFIG_INFINIBAND_USER_MEM */

#include <linux/err.h>

static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
					  unsigned long addr, size_t size,
					  int access, int dmasync) {
	return ERR_PTR(-EINVAL);
}
static inline void ib_umem_release(struct ib_umem *umem) { }
static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }

#endif /* CONFIG_INFINIBAND_USER_MEM */

#endif /* IB_UMEM_H */
Commit	Line	Data
f7c6a7b5 RD	1	/*
	2	* Copyright (c) 2007 Cisco Systems. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
	33	#ifndef IB_UMEM_H
	34	#define IB_UMEM_H
	35
	36	#include <linux/list.h>
	37	#include <linux/scatterlist.h>
e8edc6e0	38	#include <linux/workqueue.h>
f7c6a7b5 RD	39
	40	struct ib_ucontext;
	41
	42	struct ib_umem {
	43	struct ib_ucontext *context;
	44	size_t length;
	45	int offset;
	46	int page_size;
	47	int writable;
c8d8beea	48	int hugetlb;
f7c6a7b5	49	struct list_head chunk_list;
1bf66a30 RD	50	struct work_struct work;
	51	struct mm_struct *mm;
	52	unsigned long diff;
f7c6a7b5 RD	53	};
	54
	55	struct ib_umem_chunk {
	56	struct list_head list;
	57	int nents;
	58	int nmap;
	59	struct scatterlist page_list[0];
	60	};
	61
	62	#ifdef CONFIG_INFINIBAND_USER_MEM
	63
	64	struct ib_umem ib_umem_get(struct ib_ucontext context, unsigned long addr,
cb9fbc5c	65	size_t size, int access, int dmasync);
f7c6a7b5 RD	66	void ib_umem_release(struct ib_umem *umem);
	67	int ib_umem_page_count(struct ib_umem *umem);
	68
	69	#else /* CONFIG_INFINIBAND_USER_MEM */
	70
	71	#include <linux/err.h>
	72
	73	static inline struct ib_umem ib_umem_get(struct ib_ucontext context,
	74	unsigned long addr, size_t size,
cb9fbc5c	75	int access, int dmasync) {
f7c6a7b5 RD	76	return ERR_PTR(-EINVAL);
	77	}
	78	static inline void ib_umem_release(struct ib_umem *umem) { }
	79	static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
	80
	81	#endif /* CONFIG_INFINIBAND_USER_MEM */
	82
	83	#endif /* IB_UMEM_H */