1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
6 * Copyright (c) 2015 François Tigeot
7 * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice unmodified, this list of conditions, and the following
15 * disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $FreeBSD$
32 */
33 #ifndef _LINUX_MM_H_
34 #define _LINUX_MM_H_
35
36 #include <linux/spinlock.h>
37 #include <linux/gfp.h>
38 #include <linux/kernel.h>
39
40 #define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE)
41
42 struct vm_area_struct {
43 vm_offset_t vm_start;
44 vm_offset_t vm_end;
45 vm_offset_t vm_pgoff;
46 vm_paddr_t vm_pfn; /* PFN For mmap. */
47 vm_size_t vm_len; /* length for mmap. */
48 vm_memattr_t vm_page_prot;
49 };
50
51 /*
52 * Compute log2 of the power of two rounded up count of pages
53 * needed for size bytes.
54 */
55 static inline int
get_order(unsigned long size)56 get_order(unsigned long size)
57 {
58 int order;
59
60 size = (size - 1) >> PAGE_SHIFT;
61 order = 0;
62 while (size) {
63 order++;
64 size >>= 1;
65 }
66 return (order);
67 }
68
69 static inline void *
lowmem_page_address(struct page * page)70 lowmem_page_address(struct page *page)
71 {
72
73 return page_address(page);
74 }
75
76 /*
77 * This only works via mmap ops.
78 */
79 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)80 io_remap_pfn_range(struct vm_area_struct *vma,
81 unsigned long addr, unsigned long pfn, unsigned long size,
82 vm_memattr_t prot)
83 {
84 vma->vm_page_prot = prot;
85 vma->vm_pfn = pfn;
86 vma->vm_len = size;
87
88 return (0);
89 }
90
91 static inline unsigned long
vma_pages(struct vm_area_struct * vma)92 vma_pages(struct vm_area_struct *vma)
93 {
94 return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
95 }
96
97 #define offset_in_page(off) ((off) & (PAGE_SIZE - 1))
98
99 static inline void
set_page_dirty(struct vm_page * page)100 set_page_dirty(struct vm_page *page)
101 {
102 vm_page_dirty(page);
103 }
104
105 static inline void
get_page(struct vm_page * page)106 get_page(struct vm_page *page)
107 {
108 vm_page_hold(page);
109 }
110
111 #endif /* _LINUX_MM_H_ */
112