slab.h revision 335431 
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 335431 2018-06-20 06:56:18Z hselasky $
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
88#define	ARCH_KMALLOC_MINALIGN \
89	__alignof(unsigned long long)
90
91static inline gfp_t
92linux_check_m_flags(gfp_t flags)
93{
94	const gfp_t m = M_NOWAIT | M_WAITOK;
95
96	/* make sure either M_NOWAIT or M_WAITOK is set */
97	if ((flags & m) == 0)
98		flags |= M_NOWAIT;
99	else if ((flags & m) == m)
100		flags &= ~M_WAITOK;
101
102	/* mask away LinuxKPI specific flags */
103	return (flags & GFP_NATIVE_MASK);
104}
105
106static inline void *
107kmalloc(size_t size, gfp_t flags)
108{
109	return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
110}
111
112static inline void *
113kcalloc(size_t n, size_t size, gfp_t flags)
114{
115	flags |= __GFP_ZERO;
116	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
117}
118
119static inline void *
120__vmalloc(size_t size, gfp_t flags, int other)
121{
122	return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
123}
124
125static inline void *
126vmalloc_32(size_t size)
127{
128	return (contigmalloc(size, M_KMALLOC, M_WAITOK, 0, UINT_MAX, 1, 1));
129}
130
131static inline void *
132kmalloc_array(size_t n, size_t size, gfp_t flags)
133{
134	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
135}
136
137static inline void *
138kvmalloc_array(size_t n, size_t size, gfp_t flags)
139{
140	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
141}
142
143static inline void *
144krealloc(void *ptr, size_t size, gfp_t flags)
145{
146	return (realloc(ptr, size, M_KMALLOC, linux_check_m_flags(flags)));
147}
148
149static inline void
150kfree(const void *ptr)
151{
152	free(__DECONST(void *, ptr), M_KMALLOC);
153}
154
155extern struct linux_kmem_cache *linux_kmem_cache_create(const char *name,
156    size_t size, size_t align, unsigned flags, linux_kmem_ctor_t *ctor);
157
158static inline void *
159linux_kmem_cache_alloc(struct linux_kmem_cache *c, gfp_t flags)
160{
161	return (uma_zalloc_arg(c->cache_zone, c,
162	    linux_check_m_flags(flags)));
163}
164
165static inline void *
166kmem_cache_zalloc(struct linux_kmem_cache *c, gfp_t flags)
167{
168	return (uma_zalloc_arg(c->cache_zone, c,
169	    linux_check_m_flags(flags | M_ZERO)));
170}
171
172extern void linux_kmem_cache_free_rcu(struct linux_kmem_cache *, void *);
173
174static inline void
175linux_kmem_cache_free(struct linux_kmem_cache *c, void *m)
176{
177	if (unlikely(c->cache_flags & SLAB_TYPESAFE_BY_RCU))
178		linux_kmem_cache_free_rcu(c, m);
179	else
180		uma_zfree(c->cache_zone, m);
181}
182
183extern void linux_kmem_cache_destroy(struct linux_kmem_cache *);
184
185#endif					/* _LINUX_SLAB_H_ */
186