kern_cpu.c revision 1.7
1 /* $NetBSD: kern_cpu.c,v 1.7 2007/10/08 15:12:06 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /*- 40 * Copyright (c)2007 YAMAMOTO Takashi, 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 #include <sys/cdefs.h> 66 67 __KERNEL_RCSID(0, "$NetBSD: kern_cpu.c,v 1.7 2007/10/08 15:12:06 ad Exp $"); 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/idle.h> 72 #include <sys/sched.h> 73 #include <sys/conf.h> 74 #include <sys/cpu.h> 75 #include <sys/cpuio.h> 76 #include <sys/proc.h> 77 #include <sys/kernel.h> 78 #include <sys/kauth.h> 79 #include <sys/xcall.h> 80 #include <sys/pool.h> 81 82 #include <uvm/uvm_extern.h> 83 84 void cpuctlattach(int); 85 86 static void cpu_xc_online(struct schedstate_percpu *); 87 static void cpu_xc_offline(struct schedstate_percpu *); 88 89 dev_type_ioctl(cpuctl_ioctl); 90 91 const struct cdevsw cpuctl_cdevsw = { 92 nullopen, nullclose, nullread, nullwrite, cpuctl_ioctl, 93 nullstop, notty, nopoll, nommap, nokqfilter, 94 D_OTHER | D_MPSAFE 95 }; 96 97 kmutex_t cpu_lock; 98 99 int 100 mi_cpu_attach(struct cpu_info *ci) 101 { 102 struct schedstate_percpu *spc = &ci->ci_schedstate; 103 int error; 104 105 ci->ci_index = ncpu; 106 107 mutex_init(&spc->spc_lwplock, MUTEX_SPIN, IPL_SCHED); 108 sched_cpuattach(ci); 109 uvm_cpu_attach(ci); 110 111 error = create_idle_lwp(ci); 112 if (error != 0) { 113 /* XXX revert sched_cpuattach */ 114 return error; 115 } 116 117 xc_init_cpu(ci); 118 TAILQ_INIT(&ci->ci_data.cpu_biodone); 119 ncpu++; 120 121 return 0; 122 } 123 124 void 125 cpuctlattach(int dummy) 126 { 127 128 } 129 130 int 131 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 132 { 133 CPU_INFO_ITERATOR cii; 134 cpustate_t *cs; 135 struct cpu_info *ci; 136 int error, i; 137 u_int id; 138 139 error = 0; 140 141 mutex_enter(&cpu_lock); 142 switch (cmd) { 143 case IOC_CPU_SETSTATE: 144 error = kauth_authorize_generic(l->l_cred, 145 KAUTH_GENERIC_ISSUSER, NULL); 146 if (error != 0) 147 break; 148 cs = data; 149 if ((ci = cpu_lookup(cs->cs_id)) == NULL) { 150 error = ESRCH; 151 break; 152 } 153 if (!cs->cs_intr) { 154 error = EOPNOTSUPP; 155 break; 156 } 157 error = cpu_setonline(ci, cs->cs_online); 158 break; 159 160 case IOC_CPU_GETSTATE: 161 cs = data; 162 id = cs->cs_id; 163 memset(cs, sizeof(*cs), 0); 164 cs->cs_id = id; 165 if ((ci = cpu_lookup(id)) == NULL) { 166 error = ESRCH; 167 break; 168 } 169 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 170 cs->cs_online = false; 171 else 172 cs->cs_online = true; 173 cs->cs_intr = true; 174 cs->cs_lastmod = ci->ci_schedstate.spc_lastmod; 175 break; 176 177 case IOC_CPU_MAPID: 178 i = 0; 179 for (CPU_INFO_FOREACH(cii, ci)) { 180 if (i++ == *(int *)data) 181 break; 182 } 183 if (ci == NULL) 184 error = ESRCH; 185 else 186 *(int *)data = ci->ci_cpuid; 187 break; 188 189 case IOC_CPU_GETCOUNT: 190 *(int *)data = ncpu; 191 break; 192 193 default: 194 error = ENOTTY; 195 break; 196 } 197 mutex_exit(&cpu_lock); 198 199 return error; 200 } 201 202 struct cpu_info * 203 cpu_lookup(cpuid_t id) 204 { 205 CPU_INFO_ITERATOR cii; 206 struct cpu_info *ci; 207 208 for (CPU_INFO_FOREACH(cii, ci)) { 209 if (ci->ci_cpuid == id) 210 return ci; 211 } 212 213 return NULL; 214 } 215 216 static void 217 cpu_xc_offline(struct schedstate_percpu *spc) 218 { 219 int s; 220 221 s = splsched(); 222 spc->spc_flags |= SPCF_OFFLINE; 223 splx(s); 224 } 225 226 static void 227 cpu_xc_online(struct schedstate_percpu *spc) 228 { 229 int s; 230 231 s = splsched(); 232 spc->spc_flags &= ~SPCF_OFFLINE; 233 splx(s); 234 } 235 236 int 237 cpu_setonline(struct cpu_info *ci, bool online) 238 { 239 struct schedstate_percpu *spc; 240 CPU_INFO_ITERATOR cii; 241 struct cpu_info *ci2; 242 uint64_t where; 243 xcfunc_t func; 244 int nonline; 245 246 spc = &ci->ci_schedstate; 247 248 KASSERT(mutex_owned(&cpu_lock)); 249 250 if (online) { 251 if ((spc->spc_flags & SPCF_OFFLINE) == 0) 252 return 0; 253 func = (xcfunc_t)cpu_xc_online; 254 } else { 255 if ((spc->spc_flags & SPCF_OFFLINE) != 0) 256 return 0; 257 nonline = 0; 258 for (CPU_INFO_FOREACH(cii, ci2)) { 259 nonline += ((ci2->ci_schedstate.spc_flags & 260 SPCF_OFFLINE) == 0); 261 } 262 if (nonline == 1) 263 return EBUSY; 264 func = (xcfunc_t)cpu_xc_offline; 265 } 266 267 where = xc_unicast(0, func, &ci->ci_schedstate, NULL, ci); 268 xc_wait(where); 269 spc->spc_lastmod = time_second; 270 271 return 0; 272 } 273
Indexes created Mon Sep 22 21:09:42 GMT 2025