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 * $FreeBSD$
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 #define __GFP_KSWAPD_RECLAIM 0
56
57 #define __GFP_IO 0
58 #define __GFP_NO_KSWAPD 0
59 #define __GFP_WAIT M_WAITOK
60 #define __GFP_DMA32 (1U << 24) /* LinuxKPI only */
61 #define __GFP_BITS_SHIFT 25
62 #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
63 #define __GFP_NOFAIL M_WAITOK
64
65 #define GFP_NOWAIT M_NOWAIT
66 #define GFP_ATOMIC (M_NOWAIT | M_USE_RESERVE)
67 #define GFP_KERNEL M_WAITOK
68 #define GFP_USER M_WAITOK
69 #define GFP_HIGHUSER M_WAITOK
70 #define GFP_HIGHUSER_MOVABLE M_WAITOK
71 #define GFP_IOFS M_NOWAIT
72 #define GFP_NOIO M_NOWAIT
73 #define GFP_DMA32 __GFP_DMA32
74 #define GFP_TEMPORARY M_NOWAIT
75 #define GFP_NATIVE_MASK (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO)
76 #define GFP_TRANSHUGE 0
77 #define GFP_TRANSHUGE_LIGHT 0
78
79 CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0);
80 CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK);
81
82 /*
83 * Resolve a page into a virtual address:
84 *
85 * NOTE: This function only works for pages allocated by the kernel.
86 */
87 extern void *linux_page_address(struct page *);
88
89 #define page_address(page) linux_page_address(page)
90
91 /*
92 * Page management for unmapped pages:
93 */
94 extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
95 extern void linux_free_pages(vm_page_t page, unsigned int order);
96
97 static inline struct page *
alloc_page(gfp_t flags)98 alloc_page(gfp_t flags)
99 {
100
101 return (linux_alloc_pages(flags, 0));
102 }
103
104 static inline struct page *
alloc_pages(gfp_t flags,unsigned int order)105 alloc_pages(gfp_t flags, unsigned int order)
106 {
107
108 return (linux_alloc_pages(flags, order));
109 }
110
111 static inline struct page *
alloc_pages_node(int node_id,gfp_t flags,unsigned int order)112 alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
113 {
114
115 return (linux_alloc_pages(flags, order));
116 }
117
118 static inline void
__free_pages(struct page * page,unsigned int order)119 __free_pages(struct page *page, unsigned int order)
120 {
121
122 linux_free_pages(page, order);
123 }
124
125 static inline void
__free_page(struct page * page)126 __free_page(struct page *page)
127 {
128
129 linux_free_pages(page, 0);
130 }
131
132 /*
133 * Page management for mapped pages:
134 */
135 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
136 extern void linux_free_kmem(vm_offset_t, unsigned int order);
137
138 static inline vm_offset_t
get_zeroed_page(gfp_t flags)139 get_zeroed_page(gfp_t flags)
140 {
141
142 return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
143 }
144
145 static inline vm_offset_t
__get_free_page(gfp_t flags)146 __get_free_page(gfp_t flags)
147 {
148
149 return (linux_alloc_kmem(flags, 0));
150 }
151
152 static inline vm_offset_t
__get_free_pages(gfp_t flags,unsigned int order)153 __get_free_pages(gfp_t flags, unsigned int order)
154 {
155
156 return (linux_alloc_kmem(flags, order));
157 }
158
159 static inline void
free_pages(uintptr_t addr,unsigned int order)160 free_pages(uintptr_t addr, unsigned int order)
161 {
162 if (addr == 0)
163 return;
164
165 linux_free_kmem(addr, order);
166 }
167
168 static inline void
free_page(uintptr_t addr)169 free_page(uintptr_t addr)
170 {
171 if (addr == 0)
172 return;
173
174 linux_free_kmem(addr, 0);
175 }
176
177 static inline bool
gfpflags_allow_blocking(const gfp_t gfp_flags)178 gfpflags_allow_blocking(const gfp_t gfp_flags)
179 {
180 return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
181 }
182
183 #define SetPageReserved(page) do { } while (0) /* NOP */
184 #define ClearPageReserved(page) do { } while (0) /* NOP */
185
186 #endif /* _LINUX_GFP_H_ */
187