Root/include/rdma/ib_umem.h

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

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