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>
39 #include <linux/dma-attrs.h>
44 struct ib_ucontext *context;
50 struct list_head chunk_list;
51 struct work_struct work;
56 /* contiguous memory structure */
59 struct ib_ucontext *context;
61 /* Link list of contiguous blocks being part of that cmem */
62 struct list_head ib_cmem_block;
64 /* Order of cmem block, 2^ block_order will equal number
65 of physical pages per block
67 unsigned long block_order;
68 /* Refernce counter for that memory area
69 - When value became 0 pages will be returned to the kernel.
75 struct ib_cmem_block {
77 struct list_head list;
78 /* page will point to the page struct of the head page
79 in the current compound page.
80 block order is saved once as part of ib_cmem.
87 struct ib_umem_chunk {
88 struct list_head list;
91 struct dma_attrs attrs;
92 struct scatterlist page_list[0];
95 #ifdef CONFIG_INFINIBAND_USER_MEM
97 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
98 size_t size, int access, int dmasync);
99 void ib_umem_release(struct ib_umem *umem);
100 int ib_umem_page_count(struct ib_umem *umem);
102 int ib_cmem_map_contiguous_pages_to_vma(struct ib_cmem *ib_cmem,
103 struct vm_area_struct *vma);
104 struct ib_cmem *ib_cmem_alloc_contiguous_pages(struct ib_ucontext *context,
105 unsigned long total_size,
106 unsigned long page_size_order);
107 void ib_cmem_release_contiguous_pages(struct ib_cmem *cmem);
108 int ib_umem_map_to_vma(struct ib_umem *umem,
109 struct vm_area_struct *vma);
111 #else /* CONFIG_INFINIBAND_USER_MEM */
113 #include <linux/err.h>
115 static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
116 unsigned long addr, size_t size,
117 int access, int dmasync) {
118 return ERR_PTR(-EINVAL);
120 static inline void ib_umem_release(struct ib_umem *umem) { }
121 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
123 #endif /* CONFIG_INFINIBAND_USER_MEM */
125 #endif /* IB_UMEM_H */