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
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
77 CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0);
78 CTASSERT((__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 */
85 extern 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 */
92 extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
93 extern void linux_free_pages(vm_page_t page, unsigned int order);
94
95 static inline struct page *
alloc_page(gfp_t flags)96 alloc_page(gfp_t flags)
97 {
98
99 return (linux_alloc_pages(flags, 0));
100 }
101
102 static inline struct page *
alloc_pages(gfp_t flags,unsigned int order)103 alloc_pages(gfp_t flags, unsigned int order)
104 {
105
106 return (linux_alloc_pages(flags, order));
107 }
108
109 static inline struct page *
alloc_pages_node(int node_id,gfp_t flags,unsigned int order)110 alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
111 {
112
113 return (linux_alloc_pages(flags, order));
114 }
115
116 static inline void
__free_pages(struct page * page,unsigned int order)117 __free_pages(struct page *page, unsigned int order)
118 {
119
120 linux_free_pages(page, order);
121 }
122
123 static inline void
__free_page(struct page * page)124 __free_page(struct page *page)
125 {
126
127 linux_free_pages(page, 0);
128 }
129
130 /*
131 * Page management for mapped pages:
132 */
133 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
134 extern void linux_free_kmem(vm_offset_t, unsigned int order);
135
136 static inline vm_offset_t
get_zeroed_page(gfp_t flags)137 get_zeroed_page(gfp_t flags)
138 {
139
140 return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
141 }
142
143 static inline vm_offset_t
__get_free_page(gfp_t flags)144 __get_free_page(gfp_t flags)
145 {
146
147 return (linux_alloc_kmem(flags, 0));
148 }
149
150 static inline vm_offset_t
__get_free_pages(gfp_t flags,unsigned int order)151 __get_free_pages(gfp_t flags, unsigned int order)
152 {
153
154 return (linux_alloc_kmem(flags, order));
155 }
156
157 static inline void
free_pages(uintptr_t addr,unsigned int order)158 free_pages(uintptr_t addr, unsigned int order)
159 {
160 if (addr == 0)
161 return;
162
163 linux_free_kmem(addr, order);
164 }
165
166 static inline void
free_page(uintptr_t addr)167 free_page(uintptr_t addr)
168 {
169 if (addr == 0)
170 return;
171
172 linux_free_kmem(addr, 0);
173 }
174
175 static inline bool
gfpflags_allow_blocking(const gfp_t gfp_flags)176 gfpflags_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