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 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
50 #define GFP_NOWAIT M_NOWAIT
51 #define GFP_ATOMIC (M_NOWAIT | M_USE_RESERVE)
52 #define GFP_KERNEL M_WAITOK
53 #define GFP_USER M_WAITOK
54 #define GFP_HIGHUSER M_WAITOK
55 #define GFP_HIGHUSER_MOVABLE M_WAITOK
56 #define GFP_IOFS M_NOWAIT
57
58 static inline void *
page_address(struct page * page)59 page_address(struct page *page)
60 {
61
62 if (page->object != kmem_object && page->object != kernel_object)
63 return (NULL);
64 return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS +
65 IDX_TO_OFF(page->pindex)));
66 }
67
68 static inline unsigned long
linux_get_page(gfp_t mask)69 linux_get_page(gfp_t mask)
70 {
71
72 return kmem_malloc(kmem_arena, PAGE_SIZE, mask);
73 }
74
75 #define get_zeroed_page(mask) linux_get_page((mask) | M_ZERO)
76 #define alloc_page(mask) virt_to_page(linux_get_page((mask)))
77 #define __get_free_page(mask) linux_get_page((mask))
78
79 static inline void
free_page(unsigned long page)80 free_page(unsigned long page)
81 {
82
83 if (page == 0)
84 return;
85 kmem_free(kmem_arena, page, PAGE_SIZE);
86 }
87
88 static inline void
__free_page(struct page * m)89 __free_page(struct page *m)
90 {
91
92 if (m->object != kmem_object)
93 panic("__free_page: Freed page %p not allocated via wrappers.",
94 m);
95 kmem_free(kmem_arena, (vm_offset_t)page_address(m), PAGE_SIZE);
96 }
97
98 static inline void
__free_pages(struct page * m,unsigned int order)99 __free_pages(struct page *m, unsigned int order)
100 {
101 size_t size;
102
103 if (m == NULL)
104 return;
105 size = PAGE_SIZE << order;
106 kmem_free(kmem_arena, (vm_offset_t)page_address(m), size);
107 }
108
free_pages(uintptr_t addr,unsigned int order)109 static inline void free_pages(uintptr_t addr, unsigned int order)
110 {
111 if (addr == 0)
112 return;
113 __free_pages(virt_to_page((void *)addr), order);
114 }
115
116 /*
117 * Alloc pages allocates directly from the buddy allocator on linux so
118 * order specifies a power of two bucket of pages and the results
119 * are expected to be aligned on the size as well.
120 */
121 static inline struct page *
alloc_pages(gfp_t gfp_mask,unsigned int order)122 alloc_pages(gfp_t gfp_mask, unsigned int order)
123 {
124 unsigned long page;
125 size_t size;
126
127 size = PAGE_SIZE << order;
128 page = kmem_alloc_contig(kmem_arena, size, gfp_mask, 0, -1,
129 size, 0, VM_MEMATTR_DEFAULT);
130 if (page == 0)
131 return (NULL);
132 return (virt_to_page(page));
133 }
134
__get_free_pages(gfp_t gfp_mask,unsigned int order)135 static inline uintptr_t __get_free_pages(gfp_t gfp_mask, unsigned int order)
136 {
137 struct page *page;
138
139 page = alloc_pages(gfp_mask, order);
140 if (page == NULL)
141 return (0);
142 return ((uintptr_t)page_address(page));
143 }
144
145 #define alloc_pages_node(node, mask, order) alloc_pages(mask, order)
146
147 #define kmalloc_node(chunk, mask, node) kmalloc(chunk, mask)
148
149 #endif /* _LINUX_GFP_H_ */
150