mm.h revision 289624 
1252661Snp/* $FreeBSD: head/sys/ofed/include/linux/mm.h 289624 2015-10-20 11:40:04Z hselasky $ */
2252661Snp/*-
3252661Snp * Copyright (c) 2010 Isilon Systems, Inc.
4252661Snp * Copyright (c) 2010 iX Systems, Inc.
5269364Snp * Copyright (c) 2010 Panasas, Inc.
6252661Snp * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
7252661Snp * Copyright (c) 2015 Fran��ois Tigeot
8269364Snp * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
9269364Snp * All rights reserved.
10252661Snp *
11252661Snp * Redistribution and use in source and binary forms, with or without
12252661Snp * modification, are permitted provided that the following conditions
13252661Snp * are met:
14252661Snp * 1. Redistributions of source code must retain the above copyright
15252661Snp *    notice unmodified, this list of conditions, and the following
16269364Snp *    disclaimer.
17252661Snp * 2. Redistributions in binary form must reproduce the above copyright
18252661Snp *    notice, this list of conditions and the following disclaimer in the
19252661Snp *    documentation and/or other materials provided with the distribution.
20299685Snp *
21269364Snp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22269364Snp * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23252661Snp * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24252661Snp * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25252661Snp * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26252661Snp * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27252661Snp * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32#ifndef	_LINUX_MM_H_
33#define	_LINUX_MM_H_
34
35#include <linux/spinlock.h>
36#include <linux/gfp.h>
37#include <linux/kernel.h>
38
39#define	PAGE_ALIGN(x)	ALIGN(x, PAGE_SIZE)
40
41struct vm_area_struct {
42	vm_offset_t	vm_start;
43	vm_offset_t	vm_end;
44	vm_offset_t	vm_pgoff;
45	vm_paddr_t	vm_pfn;		/* PFN For mmap. */
46	vm_size_t	vm_len;		/* length for mmap. */
47	vm_memattr_t	vm_page_prot;
48};
49
50/*
51 * Compute log2 of the power of two rounded up count of pages
52 * needed for size bytes.
53 */
54static inline int
55get_order(unsigned long size)
56{
57	int order;
58
59	size = (size - 1) >> PAGE_SHIFT;
60	order = 0;
61	while (size) {
62		order++;
63		size >>= 1;
64	}
65	return (order);
66}
67
68static inline void *
69lowmem_page_address(struct page *page)
70{
71
72	return page_address(page);
73}
74
75/*
76 * This only works via mmap ops.
77 */
78static inline int
79io_remap_pfn_range(struct vm_area_struct *vma,
80    unsigned long addr, unsigned long pfn, unsigned long size,
81    vm_memattr_t prot)
82{
83	vma->vm_page_prot = prot;
84	vma->vm_pfn = pfn;
85	vma->vm_len = size;
86
87	return (0);
88}
89
90static inline unsigned long
91vma_pages(struct vm_area_struct *vma)
92{
93	return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
94}
95
96#define	offset_in_page(off)	((off) & (PAGE_SIZE - 1))
97
98static inline void
99set_page_dirty(struct vm_page *page)
100{
101	vm_page_dirty(page);
102}
103
104static inline void
105get_page(struct vm_page *page)
106{
107	vm_page_hold(page);
108}
109
110#endif	/* _LINUX_MM_H_ */
111