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f7c6a7b5 RD |
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> | |
e8edc6e0 | 38 | #include <linux/workqueue.h> |
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39 | |
40 | struct ib_ucontext; | |
41 | ||
42 | struct ib_umem { | |
43 | struct ib_ucontext *context; | |
44 | size_t length; | |
406f9e5f | 45 | unsigned long address; |
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46 | int page_size; |
47 | int writable; | |
c8d8beea | 48 | int hugetlb; |
1bf66a30 | 49 | struct work_struct work; |
87773dd5 | 50 | struct pid *pid; |
1bf66a30 RD |
51 | struct mm_struct *mm; |
52 | unsigned long diff; | |
eeb8461e YH |
53 | struct sg_table sg_head; |
54 | int nmap; | |
55 | int npages; | |
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56 | }; |
57 | ||
406f9e5f HE |
58 | /* Returns the offset of the umem start relative to the first page. */ |
59 | static inline int ib_umem_offset(struct ib_umem *umem) | |
60 | { | |
61 | return umem->address & ((unsigned long)umem->page_size - 1); | |
62 | } | |
63 | ||
64 | /* Returns the first page of an ODP umem. */ | |
65 | static 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. */ | |
71 | static inline unsigned long ib_umem_end(struct ib_umem *umem) | |
72 | { | |
73 | return PAGE_ALIGN(umem->address + umem->length); | |
74 | } | |
75 | ||
76 | static inline size_t ib_umem_num_pages(struct ib_umem *umem) | |
77 | { | |
78 | return (ib_umem_end(umem) - ib_umem_start(umem)) >> PAGE_SHIFT; | |
79 | } | |
80 | ||
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81 | #ifdef CONFIG_INFINIBAND_USER_MEM |
82 | ||
83 | struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, | |
cb9fbc5c | 84 | size_t size, int access, int dmasync); |
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85 | void ib_umem_release(struct ib_umem *umem); |
86 | int ib_umem_page_count(struct ib_umem *umem); | |
c5d76f13 HE |
87 | int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, |
88 | size_t length); | |
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89 | |
90 | #else /* CONFIG_INFINIBAND_USER_MEM */ | |
91 | ||
92 | #include <linux/err.h> | |
93 | ||
94 | static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, | |
95 | unsigned long addr, size_t size, | |
cb9fbc5c | 96 | int access, int dmasync) { |
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97 | return ERR_PTR(-EINVAL); |
98 | } | |
99 | static inline void ib_umem_release(struct ib_umem *umem) { } | |
100 | static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; } | |
c1395a2a HE |
101 | static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, |
102 | size_t length) { | |
103 | return -EINVAL; | |
104 | } | |
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105 | #endif /* CONFIG_INFINIBAND_USER_MEM */ |
106 | ||
107 | #endif /* IB_UMEM_H */ |