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 #ifndef _LINUXKPI_LINUX_GFP_H_
30 #define _LINUXKPI_LINUX_GFP_H_
31
32 #include <sys/types.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35
36 #include <linux/page.h>
37
38 #include <vm/vm_param.h>
39 #include <vm/vm_object.h>
40 #include <vm/vm_extern.h>
41 #include <vm/vm_kern.h>
42
43 #define __GFP_NOWARN 0
44 #define __GFP_HIGHMEM 0
45 #define __GFP_ZERO M_ZERO
46 #define __GFP_NORETRY 0
47 #define __GFP_NOMEMALLOC 0
48 #define __GFP_RECLAIM 0
49 #define __GFP_RECLAIMABLE 0
50 #define __GFP_RETRY_MAYFAIL 0
51 #define __GFP_MOVABLE 0
52 #define __GFP_COMP 0
53 #define __GFP_KSWAPD_RECLAIM 0
54
55 #define __GFP_IO 0
56 #define __GFP_NO_KSWAPD 0
57 #define __GFP_KSWAPD_RECLAIM 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_NOFS 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 struct page_frag_cache {
83 void *va;
84 int pagecnt_bias;
85 };
86
87 /*
88 * Resolve a page into a virtual address:
89 *
90 * NOTE: This function only works for pages allocated by the kernel.
91 */
92 extern void *linux_page_address(struct page *);
93
94 #define page_address(page) linux_page_address(page)
95
96 /*
97 * Page management for unmapped pages:
98 */
99 extern struct page *linux_alloc_pages(gfp_t flags, unsigned int order);
100 extern void linux_free_pages(struct page *page, unsigned int order);
101 void *linuxkpi_page_frag_alloc(struct page_frag_cache *, size_t, gfp_t);
102 void linuxkpi_page_frag_free(void *);
103 void linuxkpi__page_frag_cache_drain(struct page *, size_t);
104
105 static inline struct page *
alloc_page(gfp_t flags)106 alloc_page(gfp_t flags)
107 {
108
109 return (linux_alloc_pages(flags, 0));
110 }
111
112 static inline struct page *
alloc_pages(gfp_t flags,unsigned int order)113 alloc_pages(gfp_t flags, unsigned int order)
114 {
115
116 return (linux_alloc_pages(flags, order));
117 }
118
119 static inline struct page *
alloc_pages_node(int node_id,gfp_t flags,unsigned int order)120 alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
121 {
122
123 return (linux_alloc_pages(flags, order));
124 }
125
126 static inline void
__free_pages(struct page * page,unsigned int order)127 __free_pages(struct page *page, unsigned int order)
128 {
129
130 linux_free_pages(page, order);
131 }
132
133 static inline void
__free_page(struct page * page)134 __free_page(struct page *page)
135 {
136
137 linux_free_pages(page, 0);
138 }
139
140 static inline struct page *
dev_alloc_pages(unsigned int order)141 dev_alloc_pages(unsigned int order)
142 {
143 return (linux_alloc_pages(GFP_ATOMIC, order));
144 }
145
146 /*
147 * Page management for mapped pages:
148 */
149 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
150 extern void linux_free_kmem(vm_offset_t, unsigned int order);
151
152 static inline vm_offset_t
get_zeroed_page(gfp_t flags)153 get_zeroed_page(gfp_t flags)
154 {
155
156 return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
157 }
158
159 static inline vm_offset_t
__get_free_page(gfp_t flags)160 __get_free_page(gfp_t flags)
161 {
162
163 return (linux_alloc_kmem(flags, 0));
164 }
165
166 static inline vm_offset_t
__get_free_pages(gfp_t flags,unsigned int order)167 __get_free_pages(gfp_t flags, unsigned int order)
168 {
169
170 return (linux_alloc_kmem(flags, order));
171 }
172
173 static inline void
free_pages(uintptr_t addr,unsigned int order)174 free_pages(uintptr_t addr, unsigned int order)
175 {
176 if (addr == 0)
177 return;
178
179 linux_free_kmem(addr, order);
180 }
181
182 static inline void
free_page(uintptr_t addr)183 free_page(uintptr_t addr)
184 {
185 if (addr == 0)
186 return;
187
188 linux_free_kmem(addr, 0);
189 }
190
191 static inline void *
page_frag_alloc(struct page_frag_cache * pfc,size_t fragsz,gfp_t gfp)192 page_frag_alloc(struct page_frag_cache *pfc, size_t fragsz, gfp_t gfp)
193 {
194
195 return (linuxkpi_page_frag_alloc(pfc, fragsz, gfp));
196 }
197
198 static inline void
page_frag_free(void * addr)199 page_frag_free(void *addr)
200 {
201
202 linuxkpi_page_frag_free(addr);
203 }
204
205 static inline void
__page_frag_cache_drain(struct page * page,size_t count)206 __page_frag_cache_drain(struct page *page, size_t count)
207 {
208
209 linuxkpi__page_frag_cache_drain(page, count);
210 }
211
212 static inline bool
gfpflags_allow_blocking(const gfp_t gfp_flags)213 gfpflags_allow_blocking(const gfp_t gfp_flags)
214 {
215 return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
216 }
217
218 #define SetPageReserved(page) do { } while (0) /* NOP */
219 #define ClearPageReserved(page) do { } while (0) /* NOP */
220
221 #endif /* _LINUXKPI_LINUX_GFP_H_ */
222