kern_cpu.c revision 1.4
1 /* $NetBSD: kern_cpu.c,v 1.4 2007/08/04 11:57:54 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 1.4 2007/08/04 11:57:54 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 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 mutex_init(&spc->spc_lwplock, MUTEX_SPIN, IPL_SCHED); 99 sched_cpuattach(ci); 100 101 error = create_idle_lwp(ci); 102 if (error != 0) { 103 /* XXX revert sched_cpuattach */ 104 return error; 105 } 106 107 ncpu++; 108 109 return 0; 110 } 111 112 void 113 cpuctlattach(int dummy) 114 { 115 116 } 117 118 int 119 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 120 { 121 CPU_INFO_ITERATOR cii; 122 cpustate_t *cs; 123 struct cpu_info *ci; 124 int error, i; 125 u_int id; 126 127 error = 0; 128 129 mutex_enter(&cpu_lock); 130 switch (cmd) { 131 case IOC_CPU_SETSTATE: 132 error = kauth_authorize_generic(l->l_cred, 133 KAUTH_GENERIC_ISSUSER, NULL); 134 if (error != 0) 135 break; 136 cs = data; 137 if ((ci = cpu_lookup(cs->cs_id)) == NULL) { 138 error = ESRCH; 139 break; 140 } 141 if (!cs->cs_intr) { 142 error = EOPNOTSUPP; 143 break; 144 } 145 error = cpu_setonline(ci, cs->cs_online); 146 break; 147 148 case IOC_CPU_GETSTATE: 149 cs = data; 150 id = cs->cs_id; 151 memset(cs, sizeof(*cs), 0); 152 cs->cs_id = id; 153 if ((ci = cpu_lookup(id)) == NULL) { 154 error = ESRCH; 155 break; 156 } 157 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 158 cs->cs_online = false; 159 else 160 cs->cs_online = true; 161 cs->cs_intr = true; 162 cs->cs_lastmod = ci->ci_schedstate.spc_lastmod; 163 break; 164 165 case IOC_CPU_MAPID: 166 i = 0; 167 for (CPU_INFO_FOREACH(cii, ci)) { 168 if (i++ == *(int *)data) 169 break; 170 } 171 if (ci == NULL) 172 error = ESRCH; 173 else 174 *(int *)data = ci->ci_cpuid; 175 break; 176 177 case IOC_CPU_GETCOUNT: 178 *(int *)data = ncpu; 179 break; 180 181 default: 182 error = ENOTTY; 183 break; 184 } 185 mutex_exit(&cpu_lock); 186 187 return error; 188 } 189 190 struct cpu_info * 191 cpu_lookup(cpuid_t id) 192 { 193 CPU_INFO_ITERATOR cii; 194 struct cpu_info *ci; 195 196 for (CPU_INFO_FOREACH(cii, ci)) { 197 if (ci->ci_cpuid == id) 198 return ci; 199 } 200 201 return NULL; 202 } 203 204 int 205 cpu_setonline(struct cpu_info *ci, bool online) 206 { 207 struct schedstate_percpu *spc; 208 CPU_INFO_ITERATOR cii; 209 struct cpu_info *ci2; 210 int nonline; 211 212 spc = &ci->ci_schedstate; 213 214 KASSERT(mutex_owned(&cpu_lock)); 215 216 if (online) { 217 if ((spc->spc_flags & SPCF_OFFLINE) == 0) 218 return 0; 219 spc_lock(ci); 220 spc->spc_flags &= ~SPCF_OFFLINE; 221 cpu_need_resched(ci, true); 222 spc_unlock(ci); 223 spc->spc_lastmod = time_second; 224 } else { 225 if ((spc->spc_flags & SPCF_OFFLINE) != 0) 226 return 0; 227 nonline = 0; 228 for (CPU_INFO_FOREACH(cii, ci2)) { 229 nonline += ((ci2->ci_schedstate.spc_flags & 230 SPCF_OFFLINE) == 0); 231 } 232 if (nonline == 1) 233 return EBUSY; 234 spc_lock(ci); 235 spc->spc_flags |= SPCF_OFFLINE; 236 cpu_need_resched(ci, true); 237 spc_unlock(ci); 238 do { 239 kpause("cpu", false, 1, NULL); 240 #ifdef MULTIPROCESOR 241 } while (ci->ci_curlwp != ci->ci_data.cpu_idlelwp); 242 #else 243 } while (0); 244 #endif 245 spc->spc_lastmod = time_second; 246 } 247 248 return 0; 249 } 250
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