include/sys/kmem.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright (c) 2012 by Delphix. All rights reserved.
  25  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  26  */
  27
  28 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  29 /*        All Rights Reserved   */
  30
  31 #ifndef _SYS_KMEM_H
  32 #define _SYS_KMEM_H
  33
  34 #include <sys/types.h>
  35 #include <sys/vmem.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /*
  42  * Kernel memory allocator: DDI interfaces.
  43  * See kmem_alloc(9F) for details.
  44  */
  45
  46 #define KM_SLEEP        0x0000  /* can block for memory; success guaranteed */
  47 #define KM_NOSLEEP      0x0001  /* cannot block for memory; may fail */
  48 #define KM_PANIC        0x0002  /* if memory cannot be allocated, panic */
  49 #define KM_PUSHPAGE     0x0004  /* can block for memory; may use reserve */
  50 #define KM_NORMALPRI    0x0008  /* with KM_NOSLEEP, lower priority allocation */
  51 #define KM_VMFLAGS      0x00ff  /* flags that must match VM_* flags */
  52 #define KM_ZERO         0x0100  /* zero out allocated buffer */
  53
  54 #define KM_FLAGS        0xffff  /* all settable kmem flags */
  55
  56 #if defined(_KERNEL)
  57
  58 extern void *kmem_alloc(size_t size, int kmflags);
  59 extern void *kmem_zalloc(size_t size, int kmflags);
  60 extern void kmem_free(void *buf, size_t size);
  61 extern void *kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags);
  62 extern void kmem_dump_init(size_t);
  63 extern void kmem_dump_begin(void);
  64 extern size_t kmem_dump_finish(char *buf, size_t size);
  65
  66 #endif  /* _KERNEL */
  67
  68 /*
  69  * Kernel memory allocator: private interfaces.
  70  * These interfaces are still evolving.
  71  * Do not use them in unbundled drivers.
  72  */
  73
  74 /*
  75  * Flags for kmem_cache_create()
  76  */
  77 #define KMC_NOTOUCH     0x00010000
  78 #define KMC_NODEBUG     0x00020000
  79 #define KMC_NOMAGAZINE  0x00040000
  80 #define KMC_NOHASH      0x00080000
  81 #define KMC_QCACHE      0x00100000
  82 #define KMC_KMEM_ALLOC  0x00200000      /* internal use only */
  83 #define KMC_IDENTIFIER  0x00400000      /* internal use only */
  84 #define KMC_PREFILL     0x00800000
  85
  86 struct kmem_cache;              /* cache structure is opaque to kmem clients */
  87
  88 typedef struct kmem_cache kmem_cache_t;
  89
  90 /* Client response to kmem move callback */
  91 typedef enum kmem_cbrc {
  92         KMEM_CBRC_YES,
  93         KMEM_CBRC_NO,
  94         KMEM_CBRC_LATER,
  95         KMEM_CBRC_DONT_NEED,
  96         KMEM_CBRC_DONT_KNOW
  97 } kmem_cbrc_t;
  98
  99 #if defined(_KERNEL)
 100
 101 /*
 102  * Helps clients implementing the move() callback to recognize known objects by
 103  * testing a client-designated pointer member. Takes advantage of the fact that
 104  * any scribbling to freed memory done by kmem is guaranteed to set one of the
 105  * two low order bits.
 106  */
 107 #define POINTER_IS_VALID(p)     (!((uintptr_t)(p) & 0x3))
 108 #define POINTER_INVALIDATE(pp)  (*(pp) = (void *)((uintptr_t)(*(pp)) | 0x1))
 109
 110 extern int kmem_ready;
 111 extern pgcnt_t kmem_reapahead;
 112 extern size_t kmem_max_cached;
 113
 114 extern void kmem_init(void);
 115 extern void kmem_thread_init(void);
 116 extern void kmem_mp_init(void);
 117 extern void kmem_reap(void);
 118 extern void kmem_reap_idspace(void);
 119 extern int kmem_debugging(void);
 120 extern size_t kmem_avail(void);
 121 extern size_t kmem_maxavail(void);
 122
 123 extern kmem_cache_t *kmem_cache_create(char *, size_t, size_t,
 124         int (*)(void *, void *, int), void (*)(void *, void *),
 125         void (*)(void *), void *, vmem_t *, int);
 126 extern void kmem_cache_set_move(kmem_cache_t *,
 127         kmem_cbrc_t (*)(void *, void *, size_t, void *));
 128 extern void kmem_cache_destroy(kmem_cache_t *);
 129 extern void *kmem_cache_alloc(kmem_cache_t *, int);
 130 extern void kmem_cache_free(kmem_cache_t *, void *);
 131 extern uint64_t kmem_cache_stat(kmem_cache_t *, char *);
 132 extern void kmem_cache_reap_now(kmem_cache_t *);
 133 extern void kmem_cache_move_notify(kmem_cache_t *, void *);
 134
 135 #endif  /* _KERNEL */
 136
 137 #ifdef  __cplusplus
 138 }
 139 #endif
 140
 141 #endif  /* _SYS_KMEM_H */