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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 | ||
39 | struct ib_ucontext; | |
40 | ||
41 | struct ib_umem { | |
42 | struct ib_ucontext *context; | |
43 | size_t length; | |
44 | int offset; | |
45 | int page_size; | |
46 | int writable; | |
47 | struct list_head chunk_list; | |
48 | }; | |
49 | ||
50 | struct ib_umem_chunk { | |
51 | struct list_head list; | |
52 | int nents; | |
53 | int nmap; | |
54 | struct scatterlist page_list[0]; | |
55 | }; | |
56 | ||
57 | #ifdef CONFIG_INFINIBAND_USER_MEM | |
58 | ||
59 | struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, | |
60 | size_t size, int access); | |
61 | void ib_umem_release(struct ib_umem *umem); | |
62 | int ib_umem_page_count(struct ib_umem *umem); | |
63 | ||
64 | #else /* CONFIG_INFINIBAND_USER_MEM */ | |
65 | ||
66 | #include <linux/err.h> | |
67 | ||
68 | static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, | |
69 | unsigned long addr, size_t size, | |
70 | int access) { | |
71 | return ERR_PTR(-EINVAL); | |
72 | } | |
73 | static inline void ib_umem_release(struct ib_umem *umem) { } | |
74 | static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; } | |
75 | ||
76 | #endif /* CONFIG_INFINIBAND_USER_MEM */ | |
77 | ||
78 | #endif /* IB_UMEM_H */ |