1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 #ifndef _LINUX_MM_H_
30 #define _LINUX_MM_H_
31
32 #include <linux/spinlock.h>
33 #include <linux/gfp.h>
34 #include <linux/kernel.h>
35
36 #define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE)
37
38 struct vm_area_struct {
39 vm_offset_t vm_start;
40 vm_offset_t vm_end;
41 vm_offset_t vm_pgoff;
42 vm_paddr_t vm_pfn; /* PFN For mmap. */
43 vm_size_t vm_len; /* length for mmap. */
44 vm_memattr_t vm_page_prot;
45 };
46
47 /*
48 * Compute log2 of the power of two rounded up count of pages
49 * needed for size bytes.
50 */
51 static inline int
get_order(unsigned long size)52 get_order(unsigned long size)
53 {
54 int order;
55
56 size = (size - 1) >> PAGE_SHIFT;
57 order = 0;
58 while (size) {
59 order++;
60 size >>= 1;
61 }
62 return (order);
63 }
64
65 static inline void *
lowmem_page_address(struct page * page)66 lowmem_page_address(struct page *page)
67 {
68
69 return page_address(page);
70 }
71
72 /*
73 * This only works via mmap ops.
74 */
75 static inline int
io_remap_pfn_range(struct vm_area_struct * vma,unsigned long addr,unsigned long pfn,unsigned long size,vm_memattr_t prot)76 io_remap_pfn_range(struct vm_area_struct *vma,
77 unsigned long addr, unsigned long pfn, unsigned long size,
78 vm_memattr_t prot)
79 {
80 vma->vm_page_prot = prot;
81 vma->vm_pfn = pfn;
82 vma->vm_len = size;
83
84 return (0);
85 }
86
87 #endif /* _LINUX_MM_H_ */
88