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
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 *
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
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
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
100 set_page_dirty(struct vm_page *page)
101 {
102 	vm_page_dirty(page);
103 }
104 
105 static inline void
106 get_page(struct vm_page *page)
107 {
108 	vm_page_hold(page);
109 }
110 
111 #endif	/* _LINUX_MM_H_ */
112