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 335410 2018-06-20 06:34:31Z 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#define	__GFP_RETRY_MAYFAIL 0
53#define	__GFP_MOVABLE	0
54#define	__GFP_COMP	0
55
56#define	__GFP_IO	0
57#define	__GFP_NO_KSWAPD	0
58#define	__GFP_WAIT	M_WAITOK
59#define	__GFP_DMA32	(1U << 24) /* LinuxKPI only */
60#define	__GFP_BITS_SHIFT 25
61#define	__GFP_BITS_MASK	((1 << __GFP_BITS_SHIFT) - 1)
62#define	__GFP_NOFAIL	M_WAITOK
63
64#define	GFP_NOWAIT	M_NOWAIT
65#define	GFP_ATOMIC	(M_NOWAIT | M_USE_RESERVE)
66#define	GFP_KERNEL	M_WAITOK
67#define	GFP_USER	M_WAITOK
68#define	GFP_HIGHUSER	M_WAITOK
69#define	GFP_HIGHUSER_MOVABLE	M_WAITOK
70#define	GFP_IOFS	M_NOWAIT
71#define	GFP_NOIO	M_NOWAIT
72#define	GFP_DMA32	__GFP_DMA32
73#define	GFP_TEMPORARY	M_NOWAIT
74#define	GFP_NATIVE_MASK	(M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO)
75#define	GFP_TRANSHUGE	0
76
77CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0);
78CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK);
79
80/*
81 * Resolve a page into a virtual address:
82 *
83 * NOTE: This function only works for pages allocated by the kernel.
84 */
85extern void *linux_page_address(struct page *);
86
87#define	page_address(page) linux_page_address(page)
88
89/*
90 * Page management for unmapped pages:
91 */
92extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
93extern void linux_free_pages(vm_page_t page, unsigned int order);
94
95static inline struct page *
96alloc_page(gfp_t flags)
97{
98
99	return (linux_alloc_pages(flags, 0));
100}
101
102static inline struct page *
103alloc_pages(gfp_t flags, unsigned int order)
104{
105
106	return (linux_alloc_pages(flags, order));
107}
108
109static inline struct page *
110alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
111{
112
113	return (linux_alloc_pages(flags, order));
114}
115
116static inline void
117__free_pages(struct page *page, unsigned int order)
118{
119
120	linux_free_pages(page, order);
121}
122
123static inline void
124__free_page(struct page *page)
125{
126
127	linux_free_pages(page, 0);
128}
129
130/*
131 * Page management for mapped pages:
132 */
133extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
134extern void linux_free_kmem(vm_offset_t, unsigned int order);
135
136static inline vm_offset_t
137get_zeroed_page(gfp_t flags)
138{
139
140	return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
141}
142
143static inline vm_offset_t
144__get_free_page(gfp_t flags)
145{
146
147	return (linux_alloc_kmem(flags, 0));
148}
149
150static inline vm_offset_t
151__get_free_pages(gfp_t flags, unsigned int order)
152{
153
154	return (linux_alloc_kmem(flags, order));
155}
156
157static inline void
158free_pages(uintptr_t addr, unsigned int order)
159{
160	if (addr == 0)
161		return;
162
163	linux_free_kmem(addr, order);
164}
165
166static inline void
167free_page(uintptr_t addr)
168{
169	if (addr == 0)
170		return;
171
172	linux_free_kmem(addr, 0);
173}
174
175static inline bool
176gfpflags_allow_blocking(const gfp_t gfp_flags)
177{
178	return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
179}
180
181#define	SetPageReserved(page)	do { } while (0)	/* NOP */
182#define	ClearPageReserved(page)	do { } while (0)	/* NOP */
183
184#endif	/* _LINUX_GFP_H_ */
185