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Linux kernel mirror (for testing)
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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;
41struct ib_umem_odp;
42
43struct ib_umem {
44 struct ib_ucontext *context;
45 struct mm_struct *owning_mm;
46 size_t length;
47 unsigned long address;
48 int page_shift;
49 u32 writable : 1;
50 u32 hugetlb : 1;
51 u32 is_odp : 1;
52 struct work_struct work;
53 struct sg_table sg_head;
54 int nmap;
55 int npages;
56};
57
58/* Returns the offset of the umem start relative to the first page. */
59static inline int ib_umem_offset(struct ib_umem *umem)
60{
61 return umem->address & (BIT(umem->page_shift) - 1);
62}
63
64/* Returns the first page of an ODP umem. */
65static inline unsigned long ib_umem_start(struct ib_umem *umem)
66{
67 return umem->address - ib_umem_offset(umem);
68}
69
70/* Returns the address of the page after the last one of an ODP umem. */
71static inline unsigned long ib_umem_end(struct ib_umem *umem)
72{
73 return ALIGN(umem->address + umem->length, BIT(umem->page_shift));
74}
75
76static inline size_t ib_umem_num_pages(struct ib_umem *umem)
77{
78 return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift;
79}
80
81#ifdef CONFIG_INFINIBAND_USER_MEM
82
83struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
84 size_t size, int access, int dmasync);
85void ib_umem_release(struct ib_umem *umem);
86int ib_umem_page_count(struct ib_umem *umem);
87int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
88 size_t length);
89
90#else /* CONFIG_INFINIBAND_USER_MEM */
91
92#include <linux/err.h>
93
94static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
95 unsigned long addr, size_t size,
96 int access, int dmasync) {
97 return ERR_PTR(-EINVAL);
98}
99static inline void ib_umem_release(struct ib_umem *umem) { }
100static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
101static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
102 size_t length) {
103 return -EINVAL;
104}
105#endif /* CONFIG_INFINIBAND_USER_MEM */
106
107#endif /* IB_UMEM_H */