slab.h revision 331756 
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: stable/11/sys/compat/linuxkpi/common/include/linux/slab.h 331756 2018-03-30 02:04:46Z emaste $
30 */
31#ifndef	_LINUX_SLAB_H_
32#define	_LINUX_SLAB_H_
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/malloc.h>
37#include <sys/limits.h>
38#include <vm/uma.h>
39
40#include <linux/types.h>
41#include <linux/gfp.h>
42
43MALLOC_DECLARE(M_KMALLOC);
44
45#define	kvmalloc(size)			kmalloc(size, 0)
46#define	kzalloc(size, flags)		kmalloc(size, (flags) | __GFP_ZERO)
47#define	kzalloc_node(size, flags, node)	kmalloc(size, (flags) | __GFP_ZERO)
48#define	kfree_const(ptr)		kfree(ptr)
49#define	vzalloc(size)			__vmalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, 0)
50#define	vfree(arg)			kfree(arg)
51#define	kvfree(arg)			kfree(arg)
52#define	vmalloc_node(size, node)	__vmalloc(size, GFP_KERNEL, 0)
53#define	vmalloc_user(size)		__vmalloc(size, GFP_KERNEL | __GFP_ZERO, 0)
54#define	vmalloc(size)			__vmalloc(size, GFP_KERNEL, 0)
55#define	__kmalloc(...)			kmalloc(__VA_ARGS__)
56#define	kmalloc_node(chunk, flags, n)	kmalloc(chunk, flags)
57
58/*
59 * Prefix some functions with linux_ to avoid namespace conflict
60 * with the OpenSolaris code in the kernel.
61 */
62#define	kmem_cache		linux_kmem_cache
63#define	kmem_cache_create(...)	linux_kmem_cache_create(__VA_ARGS__)
64#define	kmem_cache_alloc(...)	linux_kmem_cache_alloc(__VA_ARGS__)
65#define	kmem_cache_free(...)	linux_kmem_cache_free(__VA_ARGS__)
66#define	kmem_cache_destroy(...) linux_kmem_cache_destroy(__VA_ARGS__)
67
68#define	KMEM_CACHE(__struct, flags)					\
69	linux_kmem_cache_create(#__struct, sizeof(struct __struct),	\
70	__alignof(struct __struct), (flags), NULL)
71
72typedef void linux_kmem_ctor_t (void *);
73
74struct linux_kmem_cache {
75	uma_zone_t cache_zone;
76	linux_kmem_ctor_t *cache_ctor;
77	unsigned cache_flags;
78	unsigned cache_size;
79};
80
81#define	SLAB_HWCACHE_ALIGN	(1 << 0)
82#define	SLAB_TYPESAFE_BY_RCU	(1 << 1)
83#define	SLAB_RECLAIM_ACCOUNT	(1 << 2)
84
85#define	SLAB_DESTROY_BY_RCU \
86	SLAB_TYPESAFE_BY_RCU
87
88static inline gfp_t
89linux_check_m_flags(gfp_t flags)
90{
91	const gfp_t m = M_NOWAIT | M_WAITOK;
92
93	/* make sure either M_NOWAIT or M_WAITOK is set */
94	if ((flags & m) == 0)
95		flags |= M_NOWAIT;
96	else if ((flags & m) == m)
97		flags &= ~M_WAITOK;
98
99	/* mask away LinuxKPI specific flags */
100	return (flags & GFP_NATIVE_MASK);
101}
102
103static inline void *
104kmalloc(size_t size, gfp_t flags)
105{
106	return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
107}
108
109static inline void *
110kcalloc(size_t n, size_t size, gfp_t flags)
111{
112	flags |= __GFP_ZERO;
113	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
114}
115
116static inline void *
117__vmalloc(size_t size, gfp_t flags, int other)
118{
119	return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
120}
121
122static inline void *
123vmalloc_32(size_t size)
124{
125	return (contigmalloc(size, M_KMALLOC, M_WAITOK, 0, UINT_MAX, 1, 1));
126}
127
128static inline void *
129kmalloc_array(size_t n, size_t size, gfp_t flags)
130{
131	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
132}
133
134static inline void *
135krealloc(void *ptr, size_t size, gfp_t flags)
136{
137	return (realloc(ptr, size, M_KMALLOC, linux_check_m_flags(flags)));
138}
139
140static inline void
141kfree(const void *ptr)
142{
143	free(__DECONST(void *, ptr), M_KMALLOC);
144}
145
146extern struct linux_kmem_cache *linux_kmem_cache_create(const char *name,
147    size_t size, size_t align, unsigned flags, linux_kmem_ctor_t *ctor);
148
149static inline void *
150linux_kmem_cache_alloc(struct linux_kmem_cache *c, gfp_t flags)
151{
152	return (uma_zalloc_arg(c->cache_zone, c,
153	    linux_check_m_flags(flags)));
154}
155
156static inline void *
157kmem_cache_zalloc(struct linux_kmem_cache *c, gfp_t flags)
158{
159	return (uma_zalloc_arg(c->cache_zone, c,
160	    linux_check_m_flags(flags | M_ZERO)));
161}
162
163extern void linux_kmem_cache_free_rcu(struct linux_kmem_cache *, void *);
164
165static inline void
166linux_kmem_cache_free(struct linux_kmem_cache *c, void *m)
167{
168	if (unlikely(c->cache_flags & SLAB_TYPESAFE_BY_RCU))
169		linux_kmem_cache_free_rcu(c, m);
170	else
171		uma_zfree(c->cache_zone, m);
172}
173
174extern void linux_kmem_cache_destroy(struct linux_kmem_cache *);
175
176#endif					/* _LINUX_SLAB_H_ */
177