2 * Copyright (c) 2007 Cisco Systems. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
36 #include <linux/list.h>
37 #include <linux/scatterlist.h>
38 #include <linux/workqueue.h>
43 struct ib_ucontext *context;
45 unsigned long address;
49 struct work_struct work;
53 struct sg_table sg_head;
58 /* Returns the offset of the umem start relative to the first page. */
59 static inline int ib_umem_offset(struct ib_umem *umem)
61 return umem->address & ((unsigned long)umem->page_size - 1);
64 /* Returns the first page of an ODP umem. */
65 static inline unsigned long ib_umem_start(struct ib_umem *umem)
67 return umem->address - ib_umem_offset(umem);
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)
73 return PAGE_ALIGN(umem->address + umem->length);
76 static inline size_t ib_umem_num_pages(struct ib_umem *umem)
78 return (ib_umem_end(umem) - ib_umem_start(umem)) >> PAGE_SHIFT;
81 #ifdef CONFIG_INFINIBAND_USER_MEM
83 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
84 size_t size, int access, int dmasync);
85 void ib_umem_release(struct ib_umem *umem);
86 int ib_umem_page_count(struct ib_umem *umem);
88 #else /* CONFIG_INFINIBAND_USER_MEM */
90 #include <linux/err.h>
92 static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
93 unsigned long addr, size_t size,
94 int access, int dmasync) {
95 return ERR_PTR(-EINVAL);
97 static inline void ib_umem_release(struct ib_umem *umem) { }
98 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
100 #endif /* CONFIG_INFINIBAND_USER_MEM */
102 #endif /* IB_UMEM_H */