kern_cpu.c revision 1.8
1 /* $NetBSD: kern_cpu.c,v 1.8 2007/10/08 15:51:03 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 1.8 2007/10/08 15:51:03 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/intr.h> 74 #include <sys/conf.h> 75 #include <sys/cpu.h> 76 #include <sys/cpuio.h> 77 #include <sys/proc.h> 78 #include <sys/kernel.h> 79 #include <sys/kauth.h> 80 #include <sys/xcall.h> 81 #include <sys/pool.h> 82 83 #include <uvm/uvm_extern.h> 84 85 void cpuctlattach(int); 86 87 static void cpu_xc_online(struct schedstate_percpu *); 88 static void cpu_xc_offline(struct schedstate_percpu *); 89 90 dev_type_ioctl(cpuctl_ioctl); 91 92 const struct cdevsw cpuctl_cdevsw = { 93 nullopen, nullclose, nullread, nullwrite, cpuctl_ioctl, 94 nullstop, notty, nopoll, nommap, nokqfilter, 95 D_OTHER | D_MPSAFE 96 }; 97 98 kmutex_t cpu_lock; 99 100 int 101 mi_cpu_attach(struct cpu_info *ci) 102 { 103 struct schedstate_percpu *spc = &ci->ci_schedstate; 104 int error; 105 106 ci->ci_index = ncpu; 107 108 mutex_init(&spc->spc_lwplock, MUTEX_SPIN, IPL_SCHED); 109 sched_cpuattach(ci); 110 uvm_cpu_attach(ci); 111 112 error = create_idle_lwp(ci); 113 if (error != 0) { 114 /* XXX revert sched_cpuattach */ 115 return error; 116 } 117 118 softint_init(ci); 119 xc_init_cpu(ci); 120 TAILQ_INIT(&ci->ci_data.cpu_biodone); 121 ncpu++; 122 123 return 0; 124 } 125 126 void 127 cpuctlattach(int dummy) 128 { 129 130 } 131 132 int 133 cpuctl_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) 134 { 135 CPU_INFO_ITERATOR cii; 136 cpustate_t *cs; 137 struct cpu_info *ci; 138 int error, i; 139 u_int id; 140 141 error = 0; 142 143 mutex_enter(&cpu_lock); 144 switch (cmd) { 145 case IOC_CPU_SETSTATE: 146 error = kauth_authorize_generic(l->l_cred, 147 KAUTH_GENERIC_ISSUSER, NULL); 148 if (error != 0) 149 break; 150 cs = data; 151 if ((ci = cpu_lookup(cs->cs_id)) == NULL) { 152 error = ESRCH; 153 break; 154 } 155 if (!cs->cs_intr) { 156 error = EOPNOTSUPP; 157 break; 158 } 159 error = cpu_setonline(ci, cs->cs_online); 160 break; 161 162 case IOC_CPU_GETSTATE: 163 cs = data; 164 id = cs->cs_id; 165 memset(cs, sizeof(*cs), 0); 166 cs->cs_id = id; 167 if ((ci = cpu_lookup(id)) == NULL) { 168 error = ESRCH; 169 break; 170 } 171 if ((ci->ci_schedstate.spc_flags & SPCF_OFFLINE) != 0) 172 cs->cs_online = false; 173 else 174 cs->cs_online = true; 175 cs->cs_intr = true; 176 cs->cs_lastmod = ci->ci_schedstate.spc_lastmod; 177 break; 178 179 case IOC_CPU_MAPID: 180 i = 0; 181 for (CPU_INFO_FOREACH(cii, ci)) { 182 if (i++ == *(int *)data) 183 break; 184 } 185 if (ci == NULL) 186 error = ESRCH; 187 else 188 *(int *)data = ci->ci_cpuid; 189 break; 190 191 case IOC_CPU_GETCOUNT: 192 *(int *)data = ncpu; 193 break; 194 195 default: 196 error = ENOTTY; 197 break; 198 } 199 mutex_exit(&cpu_lock); 200 201 return error; 202 } 203 204 struct cpu_info * 205 cpu_lookup(cpuid_t id) 206 { 207 CPU_INFO_ITERATOR cii; 208 struct cpu_info *ci; 209 210 for (CPU_INFO_FOREACH(cii, ci)) { 211 if (ci->ci_cpuid == id) 212 return ci; 213 } 214 215 return NULL; 216 } 217 218 static void 219 cpu_xc_offline(struct schedstate_percpu *spc) 220 { 221 int s; 222 223 s = splsched(); 224 spc->spc_flags |= SPCF_OFFLINE; 225 splx(s); 226 } 227 228 static void 229 cpu_xc_online(struct schedstate_percpu *spc) 230 { 231 int s; 232 233 s = splsched(); 234 spc->spc_flags &= ~SPCF_OFFLINE; 235 splx(s); 236 } 237 238 int 239 cpu_setonline(struct cpu_info *ci, bool online) 240 { 241 struct schedstate_percpu *spc; 242 CPU_INFO_ITERATOR cii; 243 struct cpu_info *ci2; 244 uint64_t where; 245 xcfunc_t func; 246 int nonline; 247 248 spc = &ci->ci_schedstate; 249 250 KASSERT(mutex_owned(&cpu_lock)); 251 252 if (online) { 253 if ((spc->spc_flags & SPCF_OFFLINE) == 0) 254 return 0; 255 func = (xcfunc_t)cpu_xc_online; 256 } else { 257 if ((spc->spc_flags & SPCF_OFFLINE) != 0) 258 return 0; 259 nonline = 0; 260 for (CPU_INFO_FOREACH(cii, ci2)) { 261 nonline += ((ci2->ci_schedstate.spc_flags & 262 SPCF_OFFLINE) == 0); 263 } 264 if (nonline == 1) 265 return EBUSY; 266 func = (xcfunc_t)cpu_xc_offline; 267 } 268 269 where = xc_unicast(0, func, &ci->ci_schedstate, NULL, ci); 270 xc_wait(where); 271 spc->spc_lastmod = time_second; 272 273 return 0; 274 } 275
Indexes created Sat Sep 20 22:09:52 GMT 2025