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/cdefs.h>
33 #include <sys/types.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36
37 #include <linux/page.h>
38
39 #include <vm/vm_param.h>
40 #include <vm/vm_object.h>
41 #include <vm/vm_extern.h>
42 #include <vm/vm_kern.h>
43
44 #define __GFP_NOWARN 0
45 #define __GFP_HIGHMEM 0
46 #define __GFP_ZERO M_ZERO
47 #define __GFP_NORETRY 0
48 #define __GFP_NOMEMALLOC 0
49 #define __GFP_RECLAIM 0
50 #define __GFP_RECLAIMABLE 0
51 #define __GFP_RETRY_MAYFAIL 0
52 #define __GFP_MOVABLE 0
53 #define __GFP_COMP 0
54 #define __GFP_KSWAPD_RECLAIM 0
55
56 #define __GFP_IO 0
57 #define __GFP_NO_KSWAPD 0
58 #define __GFP_KSWAPD_RECLAIM 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_NOFS M_NOWAIT
74 #define GFP_DMA32 __GFP_DMA32
75 #define GFP_TEMPORARY M_NOWAIT
76 #define GFP_NATIVE_MASK (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO)
77 #define GFP_TRANSHUGE 0
78 #define GFP_TRANSHUGE_LIGHT 0
79
80 CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0);
81 CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK);
82
83 struct page_frag_cache {
84 void *va;
85 int pagecnt_bias;
86 };
87
88 /*
89 * Resolve a page into a virtual address:
90 *
91 * NOTE: This function only works for pages allocated by the kernel.
92 */
93 void *linux_page_address(struct page *);
94
95 #define page_address(page) linux_page_address(page)
96
97 /*
98 * Page management for unmapped pages:
99 */
100 struct page *linux_alloc_pages(gfp_t flags, unsigned int order);
101 void linux_free_pages(struct page *page, unsigned int order);
102 void *linuxkpi_page_frag_alloc(struct page_frag_cache *, size_t, gfp_t);
103 void linuxkpi_page_frag_free(void *);
104 void linuxkpi__page_frag_cache_drain(struct page *, size_t);
105
106 static inline struct page *
alloc_page(gfp_t flags)107 alloc_page(gfp_t flags)
108 {
109
110 return (linux_alloc_pages(flags, 0));
111 }
112
113 static inline struct page *
alloc_pages(gfp_t flags,unsigned int order)114 alloc_pages(gfp_t flags, unsigned int order)
115 {
116
117 return (linux_alloc_pages(flags, order));
118 }
119
120 static inline struct page *
alloc_pages_node(int node_id,gfp_t flags,unsigned int order)121 alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
122 {
123
124 return (linux_alloc_pages(flags, order));
125 }
126
127 static inline void
__free_pages(struct page * page,unsigned int order)128 __free_pages(struct page *page, unsigned int order)
129 {
130
131 linux_free_pages(page, order);
132 }
133
134 static inline void
__free_page(struct page * page)135 __free_page(struct page *page)
136 {
137
138 linux_free_pages(page, 0);
139 }
140
141 static inline struct page *
dev_alloc_pages(unsigned int order)142 dev_alloc_pages(unsigned int order)
143 {
144 return (linux_alloc_pages(GFP_ATOMIC, order));
145 }
146
147 /*
148 * Page management for mapped pages:
149 */
150 vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
151 void linux_free_kmem(vm_offset_t, unsigned int order);
152
153 static inline vm_offset_t
get_zeroed_page(gfp_t flags)154 get_zeroed_page(gfp_t flags)
155 {
156
157 return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
158 }
159
160 static inline vm_offset_t
__get_free_page(gfp_t flags)161 __get_free_page(gfp_t flags)
162 {
163
164 return (linux_alloc_kmem(flags, 0));
165 }
166
167 static inline vm_offset_t
__get_free_pages(gfp_t flags,unsigned int order)168 __get_free_pages(gfp_t flags, unsigned int order)
169 {
170
171 return (linux_alloc_kmem(flags, order));
172 }
173
174 static inline void
free_pages(uintptr_t addr,unsigned int order)175 free_pages(uintptr_t addr, unsigned int order)
176 {
177 if (addr == 0)
178 return;
179
180 linux_free_kmem(addr, order);
181 }
182
183 static inline void
free_page(uintptr_t addr)184 free_page(uintptr_t addr)
185 {
186 if (addr == 0)
187 return;
188
189 linux_free_kmem(addr, 0);
190 }
191
192 static inline void *
page_frag_alloc(struct page_frag_cache * pfc,size_t fragsz,gfp_t gfp)193 page_frag_alloc(struct page_frag_cache *pfc, size_t fragsz, gfp_t gfp)
194 {
195
196 return (linuxkpi_page_frag_alloc(pfc, fragsz, gfp));
197 }
198
199 static inline void
page_frag_free(void * addr)200 page_frag_free(void *addr)
201 {
202
203 linuxkpi_page_frag_free(addr);
204 }
205
206 static inline void
__page_frag_cache_drain(struct page * page,size_t count)207 __page_frag_cache_drain(struct page *page, size_t count)
208 {
209
210 linuxkpi__page_frag_cache_drain(page, count);
211 }
212
213 static inline bool
gfpflags_allow_blocking(const gfp_t gfp_flags)214 gfpflags_allow_blocking(const gfp_t gfp_flags)
215 {
216 return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
217 }
218
219 #define SetPageReserved(page) do { } while (0) /* NOP */
220 #define ClearPageReserved(page) do { } while (0) /* NOP */
221
222 #endif /* _LINUXKPI_LINUX_GFP_H_ */
223