slab.h revision 328653 
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 328653 2018-02-01 13:01:44Z 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
68typedef void linux_kmem_ctor_t (void *);
69
70struct linux_kmem_cache {
71	uma_zone_t cache_zone;
72	linux_kmem_ctor_t *cache_ctor;
73	unsigned cache_flags;
74	unsigned cache_size;
75};
76
77#define	SLAB_HWCACHE_ALIGN	(1 << 0)
78#define	SLAB_DESTROY_BY_RCU     (1 << 1)
79#define	SLAB_RECLAIM_ACCOUNT	(1 << 2)
80
81static inline gfp_t
82linux_check_m_flags(gfp_t flags)
83{
84	const gfp_t m = M_NOWAIT | M_WAITOK;
85
86	/* make sure either M_NOWAIT or M_WAITOK is set */
87	if ((flags & m) == 0)
88		flags |= M_NOWAIT;
89	else if ((flags & m) == m)
90		flags &= ~M_WAITOK;
91
92	/* mask away LinuxKPI specific flags */
93	return (flags & GFP_NATIVE_MASK);
94}
95
96static inline void *
97kmalloc(size_t size, gfp_t flags)
98{
99	return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
100}
101
102static inline void *
103kcalloc(size_t n, size_t size, gfp_t flags)
104{
105	flags |= __GFP_ZERO;
106	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
107}
108
109static inline void *
110__vmalloc(size_t size, gfp_t flags, int other)
111{
112	return (malloc(size, M_KMALLOC, linux_check_m_flags(flags)));
113}
114
115static inline void *
116vmalloc_32(size_t size)
117{
118	return (contigmalloc(size, M_KMALLOC, M_WAITOK, 0, UINT_MAX, 1, 1));
119}
120
121static inline void *
122kmalloc_array(size_t n, size_t size, gfp_t flags)
123{
124	return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags)));
125}
126
127static inline void *
128krealloc(void *ptr, size_t size, gfp_t flags)
129{
130	return (realloc(ptr, size, M_KMALLOC, linux_check_m_flags(flags)));
131}
132
133static inline void
134kfree(const void *ptr)
135{
136	free(__DECONST(void *, ptr), M_KMALLOC);
137}
138
139extern struct linux_kmem_cache *linux_kmem_cache_create(const char *name,
140    size_t size, size_t align, unsigned flags, linux_kmem_ctor_t *ctor);
141
142static inline void *
143linux_kmem_cache_alloc(struct linux_kmem_cache *c, gfp_t flags)
144{
145	return (uma_zalloc_arg(c->cache_zone, c,
146	    linux_check_m_flags(flags)));
147}
148
149static inline void *
150kmem_cache_zalloc(struct linux_kmem_cache *c, gfp_t flags)
151{
152	return (uma_zalloc_arg(c->cache_zone, c,
153	    linux_check_m_flags(flags | M_ZERO)));
154}
155
156extern void linux_kmem_cache_free_rcu(struct linux_kmem_cache *, void *);
157
158static inline void
159linux_kmem_cache_free(struct linux_kmem_cache *c, void *m)
160{
161	if (unlikely(c->cache_flags & SLAB_DESTROY_BY_RCU))
162		linux_kmem_cache_free_rcu(c, m);
163	else
164		uma_zfree(c->cache_zone, m);
165}
166
167extern void linux_kmem_cache_destroy(struct linux_kmem_cache *);
168
169#endif					/* _LINUX_SLAB_H_ */
170