gfp.h revision 278681 
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
30#ifndef	_LINUX_GFP_H_
31#define	_LINUX_GFP_H_
32
33#include <sys/cdefs.h>
34#include <sys/types.h>
35#include <sys/systm.h>
36#include <sys/malloc.h>
37
38#include <linux/page.h>
39
40#include <vm/vm_param.h>
41#include <vm/vm_object.h>
42#include <vm/vm_extern.h>
43#include <vm/vm_kern.h>
44
45#define	__GFP_NOWARN	0
46#define	__GFP_HIGHMEM	0
47#define	__GFP_ZERO	M_ZERO
48
49#define	GFP_NOWAIT	M_NOWAIT
50#define	GFP_ATOMIC	(M_NOWAIT | M_USE_RESERVE)
51#define	GFP_KERNEL	M_WAITOK
52#define	GFP_USER	M_WAITOK
53#define	GFP_HIGHUSER	M_WAITOK
54#define	GFP_HIGHUSER_MOVABLE	M_WAITOK
55#define	GFP_IOFS	M_NOWAIT
56
57static inline void *
58page_address(struct page *page)
59{
60
61	if (page->object != kmem_object && page->object != kernel_object)
62		return (NULL);
63	return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS +
64	    IDX_TO_OFF(page->pindex)));
65}
66
67static inline unsigned long
68_get_page(gfp_t mask)
69{
70
71	return kmem_malloc(kmem_arena, PAGE_SIZE, mask);
72}
73
74#define	get_zeroed_page(mask)	_get_page((mask) | M_ZERO)
75#define	alloc_page(mask)	virt_to_page(_get_page((mask)))
76#define	__get_free_page(mask)	_get_page((mask))
77
78static inline void
79free_page(unsigned long page)
80{
81
82	if (page == 0)
83		return;
84	kmem_free(kmem_arena, page, PAGE_SIZE);
85}
86
87static inline void
88__free_page(struct page *m)
89{
90
91	if (m->object != kmem_object)
92		panic("__free_page:  Freed page %p not allocated via wrappers.",
93		    m);
94	kmem_free(kmem_arena, (vm_offset_t)page_address(m), PAGE_SIZE);
95}
96
97static inline void
98__free_pages(struct page *m, unsigned int order)
99{
100	size_t size;
101
102	if (m == NULL)
103		return;
104	size = PAGE_SIZE << order;
105	kmem_free(kmem_arena, (vm_offset_t)page_address(m), size);
106}
107
108static inline void free_pages(uintptr_t addr, unsigned int order)
109{
110	if (addr == 0)
111		return;
112	__free_pages(virt_to_page((void *)addr), order);
113}
114
115/*
116 * Alloc pages allocates directly from the buddy allocator on linux so
117 * order specifies a power of two bucket of pages and the results
118 * are expected to be aligned on the size as well.
119 */
120static inline struct page *
121alloc_pages(gfp_t gfp_mask, unsigned int order)
122{
123	unsigned long page;
124	size_t size;
125
126	size = PAGE_SIZE << order;
127	page = kmem_alloc_contig(kmem_arena, size, gfp_mask, 0, -1,
128	    size, 0, VM_MEMATTR_DEFAULT);
129	if (page == 0)
130		return (NULL);
131        return (virt_to_page(page));
132}
133
134static inline uintptr_t __get_free_pages(gfp_t gfp_mask, unsigned int order)
135{
136	struct page *page;
137
138	page = alloc_pages(gfp_mask, order);
139	if (page == NULL)
140		return (0);
141	return ((uintptr_t)page_address(page));
142}
143
144#define alloc_pages_node(node, mask, order)     alloc_pages(mask, order)
145
146#define kmalloc_node(chunk, mask, node)         kmalloc(chunk, mask)
147
148#endif	/* _LINUX_GFP_H_ */
149