gfp.h revision 294839 
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: head/sys/compat/linuxkpi/common/include/linux/gfp.h 294839 2016-01-26 15:26:35Z hselasky $
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#define	GFP_NOIO	M_NOWAIT
58
59static inline void *
60page_address(struct page *page)
61{
62
63	if (page->object != kmem_object && page->object != kernel_object)
64		return (NULL);
65	return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS +
66	    IDX_TO_OFF(page->pindex)));
67}
68
69static inline unsigned long
70linux_get_page(gfp_t mask)
71{
72
73	return kmem_malloc(kmem_arena, PAGE_SIZE, mask);
74}
75
76#define	get_zeroed_page(mask)	linux_get_page((mask) | M_ZERO)
77#define	alloc_page(mask)	virt_to_page(linux_get_page((mask)))
78#define	__get_free_page(mask)	linux_get_page((mask))
79
80static inline void
81free_page(unsigned long page)
82{
83
84	if (page == 0)
85		return;
86	kmem_free(kmem_arena, page, PAGE_SIZE);
87}
88
89static inline void
90__free_page(struct page *m)
91{
92
93	if (m->object != kmem_object)
94		panic("__free_page:  Freed page %p not allocated via wrappers.",
95		    m);
96	kmem_free(kmem_arena, (vm_offset_t)page_address(m), PAGE_SIZE);
97}
98
99static inline void
100__free_pages(struct page *m, unsigned int order)
101{
102	size_t size;
103
104	if (m == NULL)
105		return;
106	size = PAGE_SIZE << order;
107	kmem_free(kmem_arena, (vm_offset_t)page_address(m), size);
108}
109
110static inline void free_pages(uintptr_t addr, unsigned int order)
111{
112	if (addr == 0)
113		return;
114	__free_pages(virt_to_page((void *)addr), order);
115}
116
117/*
118 * Alloc pages allocates directly from the buddy allocator on linux so
119 * order specifies a power of two bucket of pages and the results
120 * are expected to be aligned on the size as well.
121 */
122static inline struct page *
123alloc_pages(gfp_t gfp_mask, unsigned int order)
124{
125	unsigned long page;
126	size_t size;
127
128	size = PAGE_SIZE << order;
129	page = kmem_alloc_contig(kmem_arena, size, gfp_mask, 0, -1,
130	    size, 0, VM_MEMATTR_DEFAULT);
131	if (page == 0)
132		return (NULL);
133        return (virt_to_page(page));
134}
135
136static inline uintptr_t __get_free_pages(gfp_t gfp_mask, unsigned int order)
137{
138	struct page *page;
139
140	page = alloc_pages(gfp_mask, order);
141	if (page == NULL)
142		return (0);
143	return ((uintptr_t)page_address(page));
144}
145
146#define alloc_pages_node(node, mask, order)     alloc_pages(mask, order)
147
148#define kmalloc_node(chunk, mask, node)         kmalloc(chunk, mask)
149
150#endif	/* _LINUX_GFP_H_ */
151