gfp.h revision 329969 
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 329969 2018-02-25 10:33:12Z 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#define	__GFP_BITS_SHIFT 25
58#define	__GFP_BITS_MASK	((1 << __GFP_BITS_SHIFT) - 1)
59
60#define	GFP_NOWAIT	M_NOWAIT
61#define	GFP_ATOMIC	(M_NOWAIT | M_USE_RESERVE)
62#define	GFP_KERNEL	M_WAITOK
63#define	GFP_USER	M_WAITOK
64#define	GFP_HIGHUSER	M_WAITOK
65#define	GFP_HIGHUSER_MOVABLE	M_WAITOK
66#define	GFP_IOFS	M_NOWAIT
67#define	GFP_NOIO	M_NOWAIT
68#define	GFP_DMA32	__GFP_DMA32
69#define	GFP_TEMPORARY	M_NOWAIT
70#define	GFP_NATIVE_MASK	(M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO)
71
72CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0);
73CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK);
74
75/*
76 * Resolve a page into a virtual address:
77 *
78 * NOTE: This function only works for pages allocated by the kernel.
79 */
80extern void *linux_page_address(struct page *);
81
82#define	page_address(page) linux_page_address(page)
83
84/*
85 * Page management for unmapped pages:
86 */
87extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
88extern void linux_free_pages(vm_page_t page, unsigned int order);
89
90static inline struct page *
91alloc_page(gfp_t flags)
92{
93
94	return (linux_alloc_pages(flags, 0));
95}
96
97static inline struct page *
98alloc_pages(gfp_t flags, unsigned int order)
99{
100
101	return (linux_alloc_pages(flags, order));
102}
103
104static inline struct page *
105alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
106{
107
108	return (linux_alloc_pages(flags, order));
109}
110
111static inline void
112__free_pages(struct page *page, unsigned int order)
113{
114
115	linux_free_pages(page, order);
116}
117
118static inline void
119__free_page(struct page *page)
120{
121
122	linux_free_pages(page, 0);
123}
124
125/*
126 * Page management for mapped pages:
127 */
128extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
129extern void linux_free_kmem(vm_offset_t, unsigned int order);
130
131static inline vm_offset_t
132get_zeroed_page(gfp_t flags)
133{
134
135	return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
136}
137
138static inline vm_offset_t
139__get_free_page(gfp_t flags)
140{
141
142	return (linux_alloc_kmem(flags, 0));
143}
144
145static inline vm_offset_t
146__get_free_pages(gfp_t flags, unsigned int order)
147{
148
149	return (linux_alloc_kmem(flags, order));
150}
151
152static inline void
153free_pages(uintptr_t addr, unsigned int order)
154{
155	if (addr == 0)
156		return;
157
158	linux_free_kmem(addr, order);
159}
160
161static inline void
162free_page(uintptr_t addr)
163{
164	if (addr == 0)
165		return;
166
167	linux_free_kmem(addr, 0);
168}
169
170static inline bool
171gfpflags_allow_blocking(const gfp_t gfp_flags)
172{
173	return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
174}
175
176#define	SetPageReserved(page)	do { } while (0)	/* NOP */
177#define	ClearPageReserved(page)	do { } while (0)	/* NOP */
178
179#endif	/* _LINUX_GFP_H_ */
180