buf.c revision 331769 
1/*
2 * Copyright (c) 2006, 2007 Cisco, Inc.  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#include <config.h>
34
35#include <stdlib.h>
36#include <errno.h>
37#include <sys/mman.h>
38
39#include "mlx4.h"
40
41int mlx4_alloc_buf(struct mlx4_buf *buf, size_t size, int page_size)
42{
43	int ret;
44
45	buf->length = align(size, page_size);
46	buf->buf = mmap(NULL, buf->length, PROT_READ | PROT_WRITE,
47			MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
48	if (buf->buf == MAP_FAILED)
49		return errno;
50
51	ret = ibv_dontfork_range(buf->buf, size);
52	if (ret)
53		munmap(buf->buf, buf->length);
54
55	return ret;
56}
57
58void mlx4_free_buf(struct mlx4_buf *buf)
59{
60	if (buf->length) {
61		ibv_dofork_range(buf->buf, buf->length);
62		munmap(buf->buf, buf->length);
63	}
64}
65