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 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * University Copyright- Copyright (c) 1982, 1986, 1988 31 * The Regents of the University of California 32 * All Rights Reserved 33 * 34 * University Acknowledgment- Portions of this document are derived from 35 * software developed by the University of California, Berkeley, and its 36 * contributors. 37 */ 38 39 #ifndef _VM_SEG_VN_H 40 #define _VM_SEG_VN_H 41 42 #pragma ident "%Z%%M% %I% %E% SMI" 43 44 #include <sys/lgrp.h> 45 #include <vm/anon.h> 46 47 #ifdef __cplusplus 48 extern "C" { 49 #endif 50 51 /* 52 * A pointer to this structure is passed to segvn_create(). 53 */ 54 typedef struct segvn_crargs { 55 struct vnode *vp; /* vnode mapped from */ 56 struct cred *cred; /* credentials */ 57 u_offset_t offset; /* starting offset of vnode for mapping */ 58 uchar_t type; /* type of sharing done */ 59 uchar_t prot; /* protections */ 60 uchar_t maxprot; /* maximum protections */ 61 uint_t flags; /* flags */ 62 struct anon_map *amp; /* anon mapping to map to */ 63 uint_t szc; /* max preferred page size code */ 64 uint_t lgrp_mem_policy_flags; 65 } segvn_crargs_t; 66 67 /* 68 * (Semi) private data maintained by the seg_vn driver per segment mapping. 69 * 70 * The read/write segment lock protects all of segvn_data including the 71 * vpage array. All fields in segvn_data are treated as read-only when 72 * the "read" version of the address space and the segment locks are held. 73 * The "write" version of the segment lock, however, is required in order to 74 * update the following fields: 75 * 76 * pageprot 77 * prot 78 * amp 79 * vpage 80 * 81 * softlockcnt 82 * is written by acquiring either the readers lock on the segment and 83 * freemem lock, or any lock combination which guarantees exclusive use 84 * of this segment (e.g., adress space writers lock, 85 * address space readers lock + segment writers lock). 86 */ 87 typedef struct segvn_data { 88 krwlock_t lock; /* protect segvn_data and vpage array */ 89 kmutex_t segp_slock; /* serialize insertions into seg_pcache */ 90 uchar_t pageprot; /* true if per page protections present */ 91 uchar_t prot; /* current segment prot if pageprot == 0 */ 92 uchar_t maxprot; /* maximum segment protections */ 93 uchar_t type; /* type of sharing done */ 94 u_offset_t offset; /* starting offset of vnode for mapping */ 95 struct vnode *vp; /* vnode that segment mapping is to */ 96 ulong_t anon_index; /* starting index into anon_map anon array */ 97 struct anon_map *amp; /* pointer to anon share structure, if needed */ 98 struct vpage *vpage; /* per-page information, if needed */ 99 struct cred *cred; /* mapping credentials */ 100 size_t swresv; /* swap space reserved for this segment */ 101 uchar_t advice; /* madvise flags for segment */ 102 uchar_t pageadvice; /* true if per page advice set */ 103 ushort_t flags; /* flags - from sys/mman.h */ 104 ssize_t softlockcnt; /* # of pages SOFTLOCKED in seg */ 105 lgrp_mem_policy_info_t policy_info; /* memory allocation policy */ 106 hat_region_cookie_t rcookie; /* region for hat calls */ 107 lgrp_mem_policy_info_t tr_policy_info; /* memory allocation for TR */ 108 struct seg *seg; /* pointer back to seg */ 109 struct segvn_data *svn_trnext; /* textrepl list next link */ 110 struct segvn_data *svn_trprev; /* textrepl list prev link */ 111 int tr_state; /* TR (text replication) state */ 112 uchar_t pageswap; /* true if per page swap accounting is set */ 113 } segvn_data_t; 114 115 #ifdef _KERNEL 116 117 /* 118 * segment text replication states. 119 */ 120 #define SEGVN_TR_INIT (0) /* Check if text replication can be enabled */ 121 #define SEGVN_TR_ON (1) /* Text replication is enabled */ 122 #define SEGVN_TR_OFF (2) /* Text replication is disabled */ 123 124 /* 125 * Macros for segvn segment driver locking. 126 */ 127 #define SEGVN_LOCK_ENTER(as, lock, type) rw_enter((lock), (type)) 128 #define SEGVN_LOCK_EXIT(as, lock) rw_exit((lock)) 129 #define SEGVN_LOCK_DOWNGRADE(as, lock) rw_downgrade((lock)) 130 #define SEGVN_LOCK_TRYENTER(as, lock, type) rw_tryenter((lock), (type)) 131 132 /* 133 * Macros to test lock states. 134 */ 135 #define SEGVN_LOCK_HELD(as, lock) RW_LOCK_HELD((lock)) 136 #define SEGVN_READ_HELD(as, lock) RW_READ_HELD((lock)) 137 #define SEGVN_WRITE_HELD(as, lock) RW_WRITE_HELD((lock)) 138 139 /* 140 * Macro used to detect the need to Break the sharing of COW pages 141 * 142 * The rw == S_WRITE is for the COW case 143 * rw == S_READ and type == SOFTLOCK is for the physio case 144 * We don't want to share a softlocked page because it can cause problems 145 * with multithreaded apps but if rw == S_READ_NOCOW it's ok to not break 146 * sharing of COW pages even in SOFTLOCK case. 147 */ 148 #define BREAK_COW_SHARE(rw, type, seg_type) ((rw == S_WRITE || \ 149 (type == F_SOFTLOCK && rw != S_READ_NOCOW)) && \ 150 seg_type == MAP_PRIVATE) 151 152 #define SEGVN_ZFOD_ARGS(prot, max) \ 153 { NULL, NULL, 0, MAP_PRIVATE, prot, max, 0, NULL, 0, 0 } 154 155 #define AS_MAP_CHECK_VNODE_LPOOB(crfp, argsp) \ 156 ((crfp) == (int (*)())segvn_create && \ 157 (((struct segvn_crargs *)(argsp))->flags & \ 158 (MAP_TEXT | MAP_INITDATA)) && \ 159 ((struct segvn_crargs *)(argsp))->szc == 0 && \ 160 ((struct segvn_crargs *)(argsp))->vp != NULL) 161 162 #define AS_MAP_CHECK_ANON_LPOOB(crfp, argsp) \ 163 ((crfp) == (int (*)())segvn_create && \ 164 (((struct segvn_crargs *)(argsp))->szc == 0 || \ 165 ((struct segvn_crargs *)(argsp))->szc == AS_MAP_HEAP || \ 166 ((struct segvn_crargs *)(argsp))->szc == AS_MAP_STACK) && \ 167 ((struct segvn_crargs *)(argsp))->vp == NULL) 168 169 #define SVNTR_HASH_FUNC(vp) (((((uintptr_t)(vp)) >> 4) ^ \ 170 (((uintptr_t)(vp)) >> 11)) & \ 171 (svntr_hashtab_sz - 1)) 172 173 #define SEGVN_TR_ADDSTAT(stat) \ 174 segvn_textrepl_stats[CPU->cpu_id].tr_stat_##stat++ 175 176 /* 177 * A hash table entry looked up by vnode, off/eoff and szc to find anon map to 178 * use for text replication based on main thread's (t_tid = 1) lgrp. 179 */ 180 typedef struct svntr { 181 struct vnode *tr_vp; /* text file vnode */ 182 u_offset_t tr_off; /* tr_vp mapping start offset */ 183 size_t tr_eoff; /* tr_vp mapping end offset */ 184 uint_t tr_szc; /* tr_vp mapping pagesize */ 185 int tr_valid; /* entry validity state */ 186 struct svntr *tr_next; /* next svntr in this hash bucket */ 187 timestruc_t tr_mtime; /* tr_vp modification time */ 188 timestruc_t tr_ctime; /* time of last change to attributes */ 189 ulong_t tr_refcnt; /* number of segs sharing this entry */ 190 segvn_data_t *tr_svnhead; /* list of segs sharing this entry */ 191 struct anon_map *tr_amp[NLGRPS_MAX]; /* per lgrp anon maps */ 192 } svntr_t; 193 194 typedef struct svntr_bucket { 195 svntr_t *tr_head; /* first svntr in this hash bucket */ 196 kmutex_t tr_lock; /* per bucket lock */ 197 } svntr_bucket_t; 198 199 typedef struct svntr_stats { 200 ulong_t tr_stat_gaerr; /* VOP_GETATTR() failures */ 201 ulong_t tr_stat_overmap; /* no TR due to beyond EOF mappings */ 202 ulong_t tr_stat_wrcnt; /* no TR due to writtable mappings */ 203 ulong_t tr_stat_stale; /* TR entry is stale */ 204 ulong_t tr_stat_overlap; /* overlap with other mappings */ 205 ulong_t tr_stat_nokmem; /* no TR due to kmem alloc failures */ 206 ulong_t tr_stat_noanon; /* no TR due to no swap space */ 207 ulong_t tr_stat_normem; /* no TR due to no repl memory */ 208 ulong_t tr_stat_nolock; /* async TR failure due to locks */ 209 ulong_t tr_stat_asyncrepl; /* number of async TRs */ 210 ulong_t tr_stat_repl; /* number of sync TRs */ 211 ulong_t tr_stat_newamp; /* number of new amp allocs for TR */ 212 } svntr_stats_t; 213 214 extern void segvn_init(void); 215 extern int segvn_create(struct seg *, void *); 216 217 extern struct seg_ops segvn_ops; 218 219 /* 220 * Provided as shorthand for creating user zfod segments. 221 */ 222 extern caddr_t zfod_argsp; 223 extern caddr_t kzfod_argsp; 224 extern caddr_t stack_exec_argsp; 225 extern caddr_t stack_noexec_argsp; 226 227 #endif /* _KERNEL */ 228 229 #ifdef __cplusplus 230 } 231 #endif 232 233 #endif /* _VM_SEG_VN_H */ 234