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
mlx4_alloc_buf(struct mlx4_buf * buf,size_t size,int page_size)41 int 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
mlx4_free_buf(struct mlx4_buf * buf)58 void 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