mm.h revision 271127 
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
38struct 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_memattr_t	vm_page_prot;
44};
45
46/*
47 * Compute log2 of the power of two rounded up count of pages
48 * needed for size bytes.
49 */
50static inline int
51get_order(unsigned long size)
52{
53	int order;
54
55	size = (size - 1) >> PAGE_SHIFT;
56	order = 0;
57	while (size) {
58		order++;
59		size >>= 1;
60	}
61	return (order);
62}
63
64static inline void *
65lowmem_page_address(struct page *page)
66{
67
68	return page_address(page);
69}
70
71/*
72 * This only works via mmap ops.
73 */
74static inline int
75io_remap_pfn_range(struct vm_area_struct *vma,
76    unsigned long addr, unsigned long pfn, unsigned long size,
77    vm_memattr_t prot)
78{
79	vma->vm_page_prot = prot;
80	vma->vm_pfn = pfn;
81
82	return (0);
83}
84
85#endif	/* _LINUX_MM_H_ */
86