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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 #include <sys/types.h> 31 #include <sys/param.h> 32 #include <sys/sysmacros.h> 33 #include <sys/signal.h> 34 #include <sys/pcb.h> 35 #include <sys/user.h> 36 #include <sys/systm.h> 37 #include <sys/sysinfo.h> 38 #include <sys/var.h> 39 #include <sys/errno.h> 40 #include <sys/cmn_err.h> 41 #include <sys/proc.h> 42 #include <sys/debug.h> 43 #include <sys/inline.h> 44 #include <sys/disp.h> 45 #include <sys/class.h> 46 #include <sys/kmem.h> 47 #include <sys/cpuvar.h> 48 #include <sys/priocntl.h> 49 50 /* 51 * Class specific code for the sys class. There are no 52 * class specific data structures associated with 53 * the sys class and the scheduling policy is trivially 54 * simple. There is no time slicing. 55 */ 56 57 pri_t sys_init(id_t, int, classfuncs_t **); 58 static int sys_getclpri(pcpri_t *); 59 static int sys_fork(kthread_t *, kthread_t *, void *); 60 static int sys_enterclass(kthread_t *, id_t, void *, cred_t *, void *); 61 static int sys_canexit(kthread_t *, cred_t *); 62 static int sys_nosys(); 63 static int sys_donice(kthread_t *, cred_t *, int, int *); 64 static int sys_doprio(kthread_t *, cred_t *, int, int *); 65 static void sys_forkret(kthread_t *, kthread_t *); 66 static void sys_nullsys(); 67 static pri_t sys_swappri(kthread_t *, int); 68 static pri_t sys_globpri(kthread_t *); 69 static int sys_alloc(void **, int); 70 71 struct classfuncs sys_classfuncs = { 72 /* messages to class manager */ 73 { 74 sys_nosys, /* admin */ 75 sys_nosys, /* getclinfo */ 76 sys_nosys, /* parmsin */ 77 sys_nosys, /* parmsout */ 78 sys_nosys, /* vaparmsin */ 79 sys_nosys, /* vaparmsout */ 80 sys_getclpri, /* getclpri */ 81 sys_alloc, 82 sys_nullsys, /* free */ 83 }, 84 /* operations on threads */ 85 { 86 sys_enterclass, /* enterclass */ 87 sys_nullsys, /* exitclass */ 88 sys_canexit, 89 sys_fork, 90 sys_forkret, /* forkret */ 91 sys_nullsys, /* parmsget */ 92 sys_nosys, /* parmsset */ 93 sys_nullsys, /* stop */ 94 sys_nullsys, /* exit */ 95 sys_nullsys, /* active */ 96 sys_nullsys, /* inactive */ 97 sys_swappri, /* swapin */ 98 sys_swappri, /* swapout */ 99 sys_nullsys, /* trapret */ 100 setfrontdq, /* preempt */ 101 setbackdq, /* setrun */ 102 sys_nullsys, /* sleep */ 103 sys_nullsys, /* tick */ 104 setbackdq, /* wakeup */ 105 sys_donice, 106 sys_globpri, /* globpri */ 107 sys_nullsys, /* set_process_group */ 108 sys_nullsys, /* yield */ 109 sys_doprio, 110 } 111 112 }; 113 114 115 /* ARGSUSED */ 116 pri_t 117 sys_init(cid, clparmsz, clfuncspp) 118 id_t cid; 119 int clparmsz; 120 classfuncs_t **clfuncspp; 121 { 122 *clfuncspp = &sys_classfuncs; 123 return ((pri_t)v.v_maxsyspri); 124 } 125 126 /* 127 * Get maximum and minimum priorities enjoyed by sysclass threads 128 */ 129 static int 130 sys_getclpri(pcpri_t *pcprip) 131 { 132 pcprip->pc_clpmax = maxclsyspri; 133 pcprip->pc_clpmin = minclsyspri; 134 return (0); 135 } 136 137 /* ARGSUSED */ 138 static int 139 sys_enterclass(t, cid, parmsp, reqpcredp, bufp) 140 kthread_t *t; 141 id_t cid; 142 void *parmsp; 143 cred_t *reqpcredp; 144 void *bufp; 145 { 146 return (0); 147 } 148 149 /* ARGSUSED */ 150 static int 151 sys_canexit(kthread_t *t, cred_t *reqpcredp) 152 { 153 return (0); 154 } 155 156 /* ARGSUSED */ 157 static int 158 sys_fork(t, ct, bufp) 159 kthread_t *t; 160 kthread_t *ct; 161 void *bufp; 162 { 163 /* 164 * No class specific data structure 165 */ 166 return (0); 167 } 168 169 170 /* ARGSUSED */ 171 static void 172 sys_forkret(t, ct) 173 kthread_t *t; 174 kthread_t *ct; 175 { 176 register proc_t *pp = ttoproc(t); 177 register proc_t *cp = ttoproc(ct); 178 179 ASSERT(t == curthread); 180 ASSERT(MUTEX_HELD(&pidlock)); 181 182 /* 183 * Grab the child's p_lock before dropping pidlock to ensure 184 * the process does not disappear before we set it running. 185 */ 186 mutex_enter(&cp->p_lock); 187 mutex_exit(&pidlock); 188 continuelwps(cp); 189 mutex_exit(&cp->p_lock); 190 191 mutex_enter(&pp->p_lock); 192 continuelwps(pp); 193 mutex_exit(&pp->p_lock); 194 } 195 196 /* ARGSUSED */ 197 static pri_t 198 sys_swappri(t, flags) 199 kthread_t *t; 200 int flags; 201 { 202 return (-1); 203 } 204 205 /* ARGSUSED */ 206 static pri_t 207 sys_globpri(kthread_t *t __unused) 208 { 209 return (-1); 210 } 211 212 static int 213 sys_nosys() 214 { 215 return (ENOSYS); 216 } 217 218 219 static void 220 sys_nullsys() 221 { 222 } 223 224 /* ARGSUSED */ 225 static int 226 sys_donice(kthread_t *t, cred_t *cr, int incr, int *retvalp) 227 { 228 return (EINVAL); 229 } 230 231 /* ARGSUSED */ 232 static int 233 sys_doprio(kthread_t *t, cred_t *cr, int incr, int *retvalp) 234 { 235 return (EINVAL); 236 } 237 238 /* ARGSUSED */ 239 static int 240 sys_alloc(void **p, int flag) 241 { 242 *p = NULL; 243 return (0); 244 } 245