gfp.h revision 289624 
1/* $FreeBSD: head/sys/ofed/include/linux/gfp.h 289624 2015-10-20 11:40:04Z hselasky $ */
2/*-
3 * Copyright (c) 2010 Isilon Systems, Inc.
4 * Copyright (c) 2010 iX Systems, Inc.
5 * Copyright (c) 2010 Panasas, Inc.
6 * Copyright (c) 2013 Mellanox Technologies, Ltd.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice unmodified, this list of conditions, and the following
14 *    disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
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
58static inline void *
59page_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
68static inline unsigned long
69_get_page(gfp_t mask)
70{
71
72	return kmem_malloc(kmem_arena, PAGE_SIZE, mask);
73}
74
75#define	get_zeroed_page(mask)	_get_page((mask) | M_ZERO)
76#define	alloc_page(mask)	virt_to_page(_get_page((mask)))
77#define	__get_free_page(mask)	_get_page((mask))
78
79static inline void
80free_page(unsigned long page)
81{
82
83	if (page == 0)
84		return;
85	kmem_free(kmem_arena, page, PAGE_SIZE);
86}
87
88static inline void
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
98static inline void
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
109static 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 */
121static inline struct page *
122alloc_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
135static 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