1 /* $NetBSD: cpuctl.c,v 1.12 2008/11/19 20:56:08 cegger Exp $ */ 2 3 /*- 4 * Copyright (c) 2007, 2008 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #include <sys/cdefs.h> 34 __RCSID("$NetBSD: cpuctl.c,v 1.12 2008/11/19 20:56:08 cegger Exp $"); 35 #endif /* not lint */ 36 37 #include <sys/param.h> 38 #include <sys/ioctl.h> 39 #include <sys/uio.h> 40 #include <sys/cpuio.h> 41 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <stdarg.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include <util.h> 51 #include <time.h> 52 #include <sched.h> 53 54 #include "cpuctl.h" 55 56 u_int getcpuid(char **); 57 int main(int, char **); 58 void usage(void); 59 60 void cpu_identify(char **); 61 void cpu_list(char **); 62 void cpu_offline(char **); 63 void cpu_online(char **); 64 65 struct cmdtab { 66 const char *label; 67 int takesargs; 68 void (*func)(char **); 69 } const cpu_cmdtab[] = { 70 { "identify", 1, cpu_identify }, 71 { "list", 0, cpu_list }, 72 { "offline", 1, cpu_offline }, 73 { "online", 1, cpu_online }, 74 { NULL, 0, NULL }, 75 }; 76 77 int fd; 78 79 int 80 main(int argc, char **argv) 81 { 82 const struct cmdtab *ct; 83 84 if (argc < 2) 85 usage(); 86 87 if ((fd = open("/dev/cpuctl", O_RDWR)) < 0) 88 err(EXIT_FAILURE, "/dev/cpuctl"); 89 90 for (ct = cpu_cmdtab; ct->label != NULL; ct++) { 91 if (strcmp(argv[1], ct->label) == 0) { 92 if ((ct->takesargs == 0) ^ (argv[2] == NULL)) 93 usage(); 94 (*ct->func)(argv + 2); 95 break; 96 } 97 } 98 99 if (ct->label == NULL) 100 errx(EXIT_FAILURE, "unknown command ``%s''", argv[optind]); 101 102 close(fd); 103 exit(EXIT_SUCCESS); 104 /* NOTREACHED */ 105 } 106 107 void 108 usage(void) 109 { 110 const char *progname = getprogname(); 111 112 fprintf(stderr, "usage: %s identify cpuno\n", progname); 113 fprintf(stderr, " %s list\n", progname); 114 fprintf(stderr, " %s offline cpuno\n", progname); 115 fprintf(stderr, " %s online cpuno\n", progname); 116 exit(EXIT_FAILURE); 117 /* NOTREACHED */ 118 } 119 120 void 121 cpu_online(char **argv) 122 { 123 cpustate_t cs; 124 125 cs.cs_id = getcpuid(argv); 126 if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0) 127 err(EXIT_FAILURE, "IOC_CPU_GETSTATE"); 128 cs.cs_online = true; 129 if (ioctl(fd, IOC_CPU_SETSTATE, &cs) < 0) 130 err(EXIT_FAILURE, "IOC_CPU_SETSTATE"); 131 } 132 133 void 134 cpu_offline(char **argv) 135 { 136 cpustate_t cs; 137 138 cs.cs_id = getcpuid(argv); 139 if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0) 140 err(EXIT_FAILURE, "IOC_CPU_GETSTATE"); 141 cs.cs_online = false; 142 if (ioctl(fd, IOC_CPU_SETSTATE, &cs) < 0) 143 err(EXIT_FAILURE, "IOC_CPU_SETSTATE"); 144 } 145 146 void 147 cpu_identify(char **argv) 148 { 149 char name[32]; 150 unsigned int id, np; 151 cpuset_t *cpuset; 152 153 np = sysconf(_SC_NPROCESSORS_CONF); 154 id = getcpuid(argv); 155 snprintf(name, sizeof(name), "cpu%u", id); 156 157 if (np != 0) { 158 cpuset = cpuset_create(); 159 if (cpuset == NULL) 160 err(EXIT_FAILURE, "cpuset_create"); 161 cpuset_zero(cpuset); 162 cpuset_set(id, cpuset); 163 if (_sched_setaffinity(0, 0, cpuset_size(cpuset), cpuset) < 0) { 164 if (errno == EPERM) { 165 printf("Cannot bind to target CPU. Output " 166 "may not accurately describe the target.\n" 167 "Run as root to allow binding.\n\n"); 168 } else { 169 err(EXIT_FAILURE, "_sched_setaffinity"); 170 } 171 } 172 cpuset_destroy(cpuset); 173 } 174 identifycpu(name); 175 } 176 177 u_int 178 getcpuid(char **argv) 179 { 180 char *argp; 181 u_int id; 182 long np; 183 184 id = (u_int)strtoul(argv[0], &argp, 0); 185 if (*argp != '\0') 186 usage(); 187 188 np = sysconf(_SC_NPROCESSORS_CONF); 189 if (id >= np) 190 errx(EXIT_FAILURE, "Invalid CPU number"); 191 192 return id; 193 } 194 195 void 196 cpu_list(char **argv) 197 { 198 const char *state, *intr; 199 cpustate_t cs; 200 u_int cnt, i; 201 202 if (ioctl(fd, IOC_CPU_GETCOUNT, &cnt) < 0) 203 err(EXIT_FAILURE, "IOC_CPU_GETCOUNT"); 204 205 printf("Num HwId Unbound LWPs Interrupts Last change\n"); 206 printf("---- ---- ------------ -------------- ----------------------------\n"); 207 208 for (i = 0; i < cnt; i++) { 209 cs.cs_id = i; 210 if (ioctl(fd, IOC_CPU_MAPID, &cs.cs_id) < 0) 211 err(EXIT_FAILURE, "IOC_CPU_MAPID"); 212 if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0) 213 err(EXIT_FAILURE, "IOC_CPU_GETINFO"); 214 if (cs.cs_online) 215 state = "online"; 216 else 217 state = "offline"; 218 if (cs.cs_intr) 219 intr = "intr"; 220 else 221 intr = "nointr"; 222 printf("%-4d %-4x %-12s %-12s %s", i, cs.cs_id, state, 223 intr, asctime(localtime(&cs.cs_lastmod))); 224 } 225 } 226 227 int 228 aprint_normal(const char *fmt, ...) 229 { 230 va_list ap; 231 int rv; 232 233 va_start(ap, fmt); 234 rv = vfprintf(stdout, fmt, ap); 235 va_end(ap); 236 237 return rv; 238 } 239 __strong_alias(aprint_verbose,aprint_normal) 240 __strong_alias(aprint_error,aprint_normal) 241 242 int 243 aprint_normal_dev(const char *dev, const char *fmt, ...) 244 { 245 va_list ap; 246 int rv; 247 248 printf("%s: ", dev); 249 va_start(ap, fmt); 250 rv = vfprintf(stdout, fmt, ap); 251 va_end(ap); 252 253 return rv; 254 } 255 __strong_alias(aprint_verbose_dev,aprint_normal_dev) 256 __strong_alias(aprint_error_dev,aprint_normal_dev) 257