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