kern_cpu.c revision 1.5
1 /* $NetBSD: kern_cpu.c,v 1.5 2007/08/05 01:19:17 rmind 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 1.5 2007/08/05 01:19:17 rmind 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 80 void cpuctlattach(int); 81 82 dev_type_ioctl(cpuctl_ioctl); 83 84 const struct cdevsw cpuctl_cdevsw = { 85 nullopen, nullclose, nullread, nullwrite, cpuctl_ioctl, 86 nullstop, notty, nopoll, nommap, nokqfilter, 87 D_OTHER | D_MPSAFE 88 }; 89 90 kmutex_t cpu_lock; 91 92 int 93 mi_cpu_attach(struct cpu_info *ci) 94 { 95 struct schedstate_percpu *spc = &ci->ci_schedstate; 96 int error; 97 98 ci->ci_index = ncpu; 99 100 mutex_init(&spc->spc_lwplock, MUTEX_SPIN, IPL_SCHED); 101 sched_cpuattach(ci); 102 103 error = create_idle_lwp(ci); 104 if (error != 0) { 105 /* XXX revert sched_cpuattach */ 106 return error; 107 } 108 109 ncpu++; 110 111 return 0; 112 } 113 114 void 115 cpuctlattach(int dummy) 116 { 117 118 } 119 120 int 121 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 122 { 123 CPU_INFO_ITERATOR cii; 124 cpustate_t *cs; 125 struct cpu_info *ci; 126 int error, i; 127 u_int id; 128 129 error = 0; 130 131 mutex_enter(&cpu_lock); 132 switch (cmd) { 133 case IOC_CPU_SETSTATE: 134 error = kauth_authorize_generic(l->l_cred, 135 KAUTH_GENERIC_ISSUSER, NULL); 136 if (error != 0) 137 break; 138 cs = data; 139 if ((ci = cpu_lookup(cs->cs_id)) == NULL) { 140 error = ESRCH; 141 break; 142 } 143 if (!cs->cs_intr) { 144 error = EOPNOTSUPP; 145 break; 146 } 147 error = cpu_setonline(ci, cs->cs_online); 148 break; 149 150 case IOC_CPU_GETSTATE: 151 cs = data; 152 id = cs->cs_id; 153 memset(cs, sizeof(*cs), 0); 154 cs->cs_id = id; 155 if ((ci = cpu_lookup(id)) == NULL) { 156 error = ESRCH; 157 break; 158 } 159 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 160 cs->cs_online = false; 161 else 162 cs->cs_online = true; 163 cs->cs_intr = true; 164 cs->cs_lastmod = ci->ci_schedstate.spc_lastmod; 165 break; 166 167 case IOC_CPU_MAPID: 168 i = 0; 169 for (CPU_INFO_FOREACH(cii, ci)) { 170 if (i++ == *(int *)data) 171 break; 172 } 173 if (ci == NULL) 174 error = ESRCH; 175 else 176 *(int *)data = ci->ci_cpuid; 177 break; 178 179 case IOC_CPU_GETCOUNT: 180 *(int *)data = ncpu; 181 break; 182 183 default: 184 error = ENOTTY; 185 break; 186 } 187 mutex_exit(&cpu_lock); 188 189 return error; 190 } 191 192 struct cpu_info * 193 cpu_lookup(cpuid_t id) 194 { 195 CPU_INFO_ITERATOR cii; 196 struct cpu_info *ci; 197 198 for (CPU_INFO_FOREACH(cii, ci)) { 199 if (ci->ci_cpuid == id) 200 return ci; 201 } 202 203 return NULL; 204 } 205 206 int 207 cpu_setonline(struct cpu_info *ci, bool online) 208 { 209 struct schedstate_percpu *spc; 210 CPU_INFO_ITERATOR cii; 211 struct cpu_info *ci2; 212 int nonline; 213 214 spc = &ci->ci_schedstate; 215 216 KASSERT(mutex_owned(&cpu_lock)); 217 218 if (online) { 219 if ((spc->spc_flags & SPCF_OFFLINE) == 0) 220 return 0; 221 spc_lock(ci); 222 spc->spc_flags &= ~SPCF_OFFLINE; 223 cpu_need_resched(ci, true); 224 spc_unlock(ci); 225 spc->spc_lastmod = time_second; 226 } else { 227 if ((spc->spc_flags & SPCF_OFFLINE) != 0) 228 return 0; 229 nonline = 0; 230 for (CPU_INFO_FOREACH(cii, ci2)) { 231 nonline += ((ci2->ci_schedstate.spc_flags & 232 SPCF_OFFLINE) == 0); 233 } 234 if (nonline == 1) 235 return EBUSY; 236 spc_lock(ci); 237 spc->spc_flags |= SPCF_OFFLINE; 238 cpu_need_resched(ci, true); 239 spc_unlock(ci); 240 do { 241 kpause("cpu", false, 1, NULL); 242 #ifdef MULTIPROCESOR 243 } while (ci->ci_curlwp != ci->ci_data.cpu_idlelwp); 244 #else 245 } while (0); 246 #endif 247 spc->spc_lastmod = time_second; 248 } 249 250 return 0; 251 } 252
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