zfs/lib/libumem/sys/vmem.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_VMEM_H
  28 #define _SYS_VMEM_H
  29
  30 /* #pragma ident        "@(#)vmem.h     1.13    05/06/08 SMI" */
  31
  32 #include <sys/types.h>
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38
  39 /*
  40  * Per-allocation flags
  41  */
  42 #define VM_SLEEP        0x00000000      /* same as KM_SLEEP */
  43 #define VM_NOSLEEP      0x00000001      /* same as KM_NOSLEEP */
  44 #define VM_PANIC        0x00000002      /* same as KM_PANIC */
  45 #define VM_PUSHPAGE     0x00000004      /* same as KM_PUSHPAGE */
  46 #define VM_KMFLAGS      0x000000ff      /* flags that must match KM_* flags */
  47
  48 #define VM_BESTFIT      0x00000100
  49 #define VM_FIRSTFIT     0x00000200
  50 #define VM_NEXTFIT      0x00000400
  51
  52 /*
  53  * The following flags are restricted for use only within the kernel.
  54  * VM_MEMLOAD is for use by the HAT to avoid infinite recursion.
  55  * VM_NORELOC is used by the kernel when static VA->PA mappings are required.
  56  */
  57 #define VM_MEMLOAD      0x00000800
  58 #define VM_NORELOC      0x00001000
  59 /*
  60  * VM_ABORT requests that vmem_alloc() *ignore* the VM_SLEEP/VM_NOSLEEP flags
  61  * and forgo reaping if the allocation or attempted import, fails.  This
  62  * flag is a segkmem-specific flag, and should not be used by anyone else.
  63  */
  64 #define VM_ABORT        0x00002000
  65
  66 #define VM_FLAGS        0x0000FFFF
  67
  68 /*
  69  * Arena creation flags
  70  */
  71 #define VMC_POPULATOR   0x00010000
  72 #define VMC_NO_QCACHE   0x00020000      /* cannot use quantum caches */
  73 #define VMC_IDENTIFIER  0x00040000      /* not backed by memory */
  74 /*
  75  * internal use only;   the import function uses the vmem_ximport_t interface
  76  *                      and may increase the request size if it so desires
  77  */
  78 #define VMC_XALLOC      0x00080000
  79 #define VMC_FLAGS       0xFFFF0000
  80
  81 /*
  82  * Public segment types
  83  */
  84 #define VMEM_ALLOC      0x01
  85 #define VMEM_FREE       0x02
  86
  87 /*
  88  * Implementation-private segment types
  89  */
  90 #define VMEM_SPAN       0x10
  91 #define VMEM_ROTOR      0x20
  92 #define VMEM_WALKER     0x40
  93
  94 /*
  95  * VMEM_REENTRANT indicates to vmem_walk() that the callback routine may
  96  * call back into the arena being walked, so vmem_walk() must drop the
  97  * arena lock before each callback.  The caveat is that since the arena
  98  * isn't locked, its state can change.  Therefore it is up to the callback
  99  * routine to handle cases where the segment isn't of the expected type.
 100  * For example, we use this to walk heap_arena when generating a crash dump;
 101  * see segkmem_dump() for sample usage.
 102  */
 103 #define VMEM_REENTRANT  0x80000000
 104
 105 typedef struct vmem vmem_t;
 106 typedef void *(vmem_alloc_t)(vmem_t *, size_t, int);
 107 typedef void (vmem_free_t)(vmem_t *, void *, size_t);
 108
 109 /*
 110  * Alternate import style; the requested size is passed in a pointer,
 111  * which can be increased by the import function if desired.
 112  */
 113 typedef void *(vmem_ximport_t)(vmem_t *, size_t *, int);
 114
 115 #if 0
 116 extern vmem_t *vmem_init(const char *, void *, size_t, size_t,
 117     vmem_alloc_t *, vmem_free_t *);
 118 extern void vmem_update(void *);
 119 extern int vmem_is_populator();
 120 extern size_t vmem_seg_size;
 121 #endif
 122
 123 extern vmem_t *vmem_create(const char *, void *, size_t, size_t,
 124     vmem_alloc_t *, vmem_free_t *, vmem_t *, size_t, int);
 125 extern vmem_t *vmem_xcreate(const char *, void *, size_t, size_t,
 126     vmem_ximport_t *, vmem_free_t *, vmem_t *, size_t, int);
 127 extern void vmem_destroy(vmem_t *);
 128 extern void *vmem_alloc(vmem_t *, size_t, int);
 129 extern void *vmem_xalloc(vmem_t *, size_t, size_t, size_t, size_t,
 130     void *, void *, int);
 131 extern void vmem_free(vmem_t *, void *, size_t);
 132 extern void vmem_xfree(vmem_t *, void *, size_t);
 133 extern void *vmem_add(vmem_t *, void *, size_t, int);
 134 extern int vmem_contains(vmem_t *, void *, size_t);
 135 extern void vmem_walk(vmem_t *, int, void (*)(void *, void *, size_t), void *);
 136 extern size_t vmem_size(vmem_t *, int);
 137
 138 #ifdef  __cplusplus
 139 }
 140 #endif
 141
 142 #endif  /* _SYS_VMEM_H */