xref: /freebsd/sys/compat/linuxkpi/common/include/linux/gfp.h (revision 924226fba12cc9a228c73b956e1b7fa24c60b055)
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	_LINUXKPI_LINUX_GFP_H_
32 #define	_LINUXKPI_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_KSWAPD_RECLAIM	0
60 #define	__GFP_WAIT	M_WAITOK
61 #define	__GFP_DMA32	(1U << 24) /* LinuxKPI only */
62 #define	__GFP_BITS_SHIFT 25
63 #define	__GFP_BITS_MASK	((1 << __GFP_BITS_SHIFT) - 1)
64 #define	__GFP_NOFAIL	M_WAITOK
65 
66 #define	GFP_NOWAIT	M_NOWAIT
67 #define	GFP_ATOMIC	(M_NOWAIT | M_USE_RESERVE)
68 #define	GFP_KERNEL	M_WAITOK
69 #define	GFP_USER	M_WAITOK
70 #define	GFP_HIGHUSER	M_WAITOK
71 #define	GFP_HIGHUSER_MOVABLE	M_WAITOK
72 #define	GFP_IOFS	M_NOWAIT
73 #define	GFP_NOIO	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 /*
84  * Resolve a page into a virtual address:
85  *
86  * NOTE: This function only works for pages allocated by the kernel.
87  */
88 extern void *linux_page_address(struct page *);
89 
90 #define	page_address(page) linux_page_address(page)
91 
92 /*
93  * Page management for unmapped pages:
94  */
95 extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
96 extern void linux_free_pages(vm_page_t page, unsigned int order);
97 
98 static inline struct page *
99 alloc_page(gfp_t flags)
100 {
101 
102 	return (linux_alloc_pages(flags, 0));
103 }
104 
105 static inline struct page *
106 alloc_pages(gfp_t flags, unsigned int order)
107 {
108 
109 	return (linux_alloc_pages(flags, order));
110 }
111 
112 static inline struct page *
113 alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
114 {
115 
116 	return (linux_alloc_pages(flags, order));
117 }
118 
119 static inline void
120 __free_pages(struct page *page, unsigned int order)
121 {
122 
123 	linux_free_pages(page, order);
124 }
125 
126 static inline void
127 __free_page(struct page *page)
128 {
129 
130 	linux_free_pages(page, 0);
131 }
132 
133 /*
134  * Page management for mapped pages:
135  */
136 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
137 extern void linux_free_kmem(vm_offset_t, unsigned int order);
138 
139 static inline vm_offset_t
140 get_zeroed_page(gfp_t flags)
141 {
142 
143 	return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
144 }
145 
146 static inline vm_offset_t
147 __get_free_page(gfp_t flags)
148 {
149 
150 	return (linux_alloc_kmem(flags, 0));
151 }
152 
153 static inline vm_offset_t
154 __get_free_pages(gfp_t flags, unsigned int order)
155 {
156 
157 	return (linux_alloc_kmem(flags, order));
158 }
159 
160 static inline void
161 free_pages(uintptr_t addr, unsigned int order)
162 {
163 	if (addr == 0)
164 		return;
165 
166 	linux_free_kmem(addr, order);
167 }
168 
169 static inline void
170 free_page(uintptr_t addr)
171 {
172 	if (addr == 0)
173 		return;
174 
175 	linux_free_kmem(addr, 0);
176 }
177 
178 static inline bool
179 gfpflags_allow_blocking(const gfp_t gfp_flags)
180 {
181 	return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
182 }
183 
184 #define	SetPageReserved(page)	do { } while (0)	/* NOP */
185 #define	ClearPageReserved(page)	do { } while (0)	/* NOP */
186 
187 #endif	/* _LINUXKPI_LINUX_GFP_H_ */
188