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> 38#include <linux/workqueue.h> 39 40struct ib_ucontext; 41 42struct ib_umem { 43 struct ib_ucontext *context; 44 size_t length; 45 int offset; 46 int page_size; 47 int writable; 48 int hugetlb; 49 struct list_head chunk_list; 50 struct work_struct work; 51 struct mm_struct *mm; 52 unsigned long diff; 53}; 54 55struct 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 64struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, 65 size_t size, int access, int dmasync); 66void ib_umem_release(struct ib_umem *umem); 67int ib_umem_page_count(struct ib_umem *umem); 68 69#else /* CONFIG_INFINIBAND_USER_MEM */ 70 71#include <linux/err.h> 72 73static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, 74 unsigned long addr, size_t size, 75 int access, int dmasync) { 76 return ERR_PTR(-EINVAL); 77} 78static inline void ib_umem_release(struct ib_umem *umem) { } 79static 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 */ 84