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#if HAVE_CONFIG_H
34#  include <config.h>
35#endif /* HAVE_CONFIG_H */
36
37#include <stdlib.h>
38#include <errno.h>
39#include <sys/mman.h>
40
41#include "mlx4.h"
42
43#if !(defined(HAVE_IBV_DONTFORK_RANGE) && defined(HAVE_IBV_DOFORK_RANGE))
44
45/*
46 * If libibverbs isn't exporting these functions, then there's no
47 * point in doing it here, because the rest of libibverbs isn't going
48 * to be fork-safe anyway.
49 */
50static int ibv_dontfork_range(void *base, size_t size)
51{
52	return 0;
53}
54
55static int ibv_dofork_range(void *base, size_t size)
56{
57	return 0;
58}
59
60#endif /* HAVE_IBV_DONTFORK_RANGE && HAVE_IBV_DOFORK_RANGE */
61
62int mlx4_alloc_buf(struct mlx4_buf *buf, size_t size, int page_size)
63{
64	int ret;
65
66	buf->length = align(size, page_size);
67	buf->buf = mmap(NULL, buf->length, PROT_READ | PROT_WRITE,
68			MAP_PRIVATE | MAP_ANON, -1, 0);
69	if (buf->buf == MAP_FAILED)
70		return errno;
71
72	ret = ibv_dontfork_range(buf->buf, size);
73	if (ret)
74		munmap(buf->buf, buf->length);
75
76	return ret;
77}
78
79void mlx4_free_buf(struct mlx4_buf *buf)
80{
81	ibv_dofork_range(buf->buf, buf->length);
82	munmap(buf->buf, buf->length);
83}
84