gfp.h revision 328653 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2017 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 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/gfp.h 328653 2018-02-01 13:01:44Z hselasky $
30 */
31#ifndef	_LINUX_GFP_H_
32#define	_LINUX_GFP_H_
33
34#include <sys/cdefs.h>
35#include <sys/types.h>
36#include <sys/systm.h>
37#include <sys/malloc.h>
38
39#include <linux/page.h>
40
41#include <vm/vm_param.h>
42#include <vm/vm_object.h>
43#include <vm/vm_extern.h>
44#include <vm/vm_kern.h>
45
46#define	__GFP_NOWARN	0
47#define	__GFP_HIGHMEM	0
48#define	__GFP_ZERO	M_ZERO
49#define	__GFP_NORETRY	0
50#define	__GFP_RECLAIM   0
51#define	__GFP_RECLAIMABLE   0
52
53#define	__GFP_IO	0
54#define	__GFP_NO_KSWAPD	0
55#define	__GFP_WAIT	M_WAITOK
56#define	__GFP_DMA32	(1U << 24) /* LinuxKPI only */
57
58#define	GFP_NOWAIT	M_NOWAIT
59#define	GFP_ATOMIC	(M_NOWAIT | M_USE_RESERVE)
60#define	GFP_KERNEL	M_WAITOK
61#define	GFP_USER	M_WAITOK
62#define	GFP_HIGHUSER	M_WAITOK
63#define	GFP_HIGHUSER_MOVABLE	M_WAITOK
64#define	GFP_IOFS	M_NOWAIT
65#define	GFP_NOIO	M_NOWAIT
66#define	GFP_DMA32	__GFP_DMA32
67#define	GFP_TEMPORARY	M_NOWAIT
68#define	GFP_NATIVE_MASK	(M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO)
69
70/*
71 * Resolve a page into a virtual address:
72 *
73 * NOTE: This function only works for pages allocated by the kernel.
74 */
75extern void *linux_page_address(struct page *);
76
77#define	page_address(page) linux_page_address(page)
78
79/*
80 * Page management for unmapped pages:
81 */
82extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
83extern void linux_free_pages(vm_page_t page, unsigned int order);
84
85static inline struct page *
86alloc_page(gfp_t flags)
87{
88
89	return (linux_alloc_pages(flags, 0));
90}
91
92static inline struct page *
93alloc_pages(gfp_t flags, unsigned int order)
94{
95
96	return (linux_alloc_pages(flags, order));
97}
98
99static inline struct page *
100alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
101{
102
103	return (linux_alloc_pages(flags, order));
104}
105
106static inline void
107__free_pages(struct page *page, unsigned int order)
108{
109
110	linux_free_pages(page, order);
111}
112
113static inline void
114__free_page(struct page *page)
115{
116
117	linux_free_pages(page, 0);
118}
119
120/*
121 * Page management for mapped pages:
122 */
123extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
124extern void linux_free_kmem(vm_offset_t, unsigned int order);
125
126static inline vm_offset_t
127get_zeroed_page(gfp_t flags)
128{
129
130	return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
131}
132
133static inline vm_offset_t
134__get_free_page(gfp_t flags)
135{
136
137	return (linux_alloc_kmem(flags, 0));
138}
139
140static inline vm_offset_t
141__get_free_pages(gfp_t flags, unsigned int order)
142{
143
144	return (linux_alloc_kmem(flags, order));
145}
146
147static inline void
148free_pages(uintptr_t addr, unsigned int order)
149{
150	if (addr == 0)
151		return;
152
153	linux_free_kmem(addr, order);
154}
155
156static inline void
157free_page(uintptr_t addr)
158{
159	if (addr == 0)
160		return;
161
162	linux_free_kmem(addr, 0);
163}
164
165static inline bool
166gfpflags_allow_blocking(const gfp_t gfp_flags)
167{
168	return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
169}
170
171#define	SetPageReserved(page)	do { } while (0)	/* NOP */
172#define	ClearPageReserved(page)	do { } while (0)	/* NOP */
173
174#endif	/* _LINUX_GFP_H_ */
175