378 lines
10 KiB
C
378 lines
10 KiB
C
/*
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* chcpu - CPU configuration tool
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*
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* Copyright IBM Corp. 2011
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "cpuset.h"
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#include "nls.h"
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#include "xalloc.h"
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#include "c.h"
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#include "strutils.h"
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#include "bitops.h"
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#include "path.h"
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#include "closestream.h"
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#include "optutils.h"
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#define EXCL_ERROR "--{configure,deconfigure,disable,dispatch,enable}"
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/* partial success, otherwise we return regular EXIT_{SUCCESS,FAILURE} */
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#define CHCPU_EXIT_SOMEOK 64
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#define _PATH_SYS_CPU "/sys/devices/system/cpu"
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#define _PATH_SYS_CPU_ONLINE _PATH_SYS_CPU "/online"
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#define _PATH_SYS_CPU_RESCAN _PATH_SYS_CPU "/rescan"
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#define _PATH_SYS_CPU_DISPATCH _PATH_SYS_CPU "/dispatching"
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static cpu_set_t *onlinecpus;
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static int maxcpus;
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#define is_cpu_online(cpu) (CPU_ISSET_S((cpu), CPU_ALLOC_SIZE(maxcpus), onlinecpus))
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#define num_online_cpus() (CPU_COUNT_S(CPU_ALLOC_SIZE(maxcpus), onlinecpus))
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enum {
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CMD_CPU_ENABLE = 0,
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CMD_CPU_DISABLE,
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CMD_CPU_CONFIGURE,
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CMD_CPU_DECONFIGURE,
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CMD_CPU_RESCAN,
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CMD_CPU_DISPATCH_HORIZONTAL,
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CMD_CPU_DISPATCH_VERTICAL,
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};
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/* returns: 0 = success
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* < 0 = failure
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* > 0 = partial success
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*/
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static int cpu_enable(cpu_set_t *cpu_set, size_t setsize, int enable)
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{
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unsigned int cpu;
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int online, rc;
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int configured = -1;
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size_t fails = 0;
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for (cpu = 0; cpu < setsize; cpu++) {
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if (!CPU_ISSET(cpu, cpu_set))
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continue;
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if (!path_exist(_PATH_SYS_CPU "/cpu%d", cpu)) {
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warnx(_("CPU %u does not exist"), cpu);
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fails++;
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continue;
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}
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if (!path_exist(_PATH_SYS_CPU "/cpu%d/online", cpu)) {
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warnx(_("CPU %u is not hot pluggable"), cpu);
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fails++;
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continue;
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}
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online = path_read_s32(_PATH_SYS_CPU "/cpu%d/online", cpu);
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if ((online == 1) && (enable == 1)) {
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printf(_("CPU %u is already enabled\n"), cpu);
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continue;
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}
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if ((online == 0) && (enable == 0)) {
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printf(_("CPU %u is already disabled\n"), cpu);
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continue;
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}
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if (path_exist(_PATH_SYS_CPU "/cpu%d/configure", cpu))
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configured = path_read_s32(_PATH_SYS_CPU "/cpu%d/configure", cpu);
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if (enable) {
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rc = path_write_str("1", _PATH_SYS_CPU "/cpu%d/online", cpu);
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if ((rc == -1) && (configured == 0)) {
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warn(_("CPU %u enable failed (CPU is deconfigured)"), cpu);
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fails++;
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} else if (rc == -1) {
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warn(_("CPU %u enable failed"), cpu);
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fails++;
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} else
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printf(_("CPU %u enabled\n"), cpu);
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} else {
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if (onlinecpus && num_online_cpus() == 1) {
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warnx(_("CPU %u disable failed (last enabled CPU)"), cpu);
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fails++;
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continue;
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}
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rc = path_write_str("0", _PATH_SYS_CPU "/cpu%d/online", cpu);
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if (rc == -1) {
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warn(_("CPU %u disable failed"), cpu);
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fails++;
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} else {
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printf(_("CPU %u disabled\n"), cpu);
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if (onlinecpus)
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CPU_CLR(cpu, onlinecpus);
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}
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}
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}
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return fails == 0 ? 0 : fails == setsize ? -1 : 1;
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}
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static int cpu_rescan(void)
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{
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if (!path_exist(_PATH_SYS_CPU_RESCAN))
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errx(EXIT_FAILURE, _("This system does not support rescanning of CPUs"));
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if (path_write_str("1", _PATH_SYS_CPU_RESCAN) == -1)
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err(EXIT_FAILURE, _("Failed to trigger rescan of CPUs"));
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printf(_("Triggered rescan of CPUs\n"));
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return 0;
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}
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static int cpu_set_dispatch(int mode)
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{
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if (!path_exist(_PATH_SYS_CPU_DISPATCH))
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errx(EXIT_FAILURE, _("This system does not support setting "
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"the dispatching mode of CPUs"));
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if (mode == 0) {
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if (path_write_str("0", _PATH_SYS_CPU_DISPATCH) == -1)
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err(EXIT_FAILURE, _("Failed to set horizontal dispatch mode"));
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printf(_("Successfully set horizontal dispatching mode\n"));
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} else {
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if (path_write_str("1", _PATH_SYS_CPU_DISPATCH) == -1)
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err(EXIT_FAILURE, _("Failed to set vertical dispatch mode"));
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printf(_("Successfully set vertical dispatching mode\n"));
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}
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return 0;
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}
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/* returns: 0 = success
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* < 0 = failure
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* > 0 = partial success
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*/
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static int cpu_configure(cpu_set_t *cpu_set, size_t setsize, int configure)
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{
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unsigned int cpu;
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int rc, current;
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size_t fails = 0;
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for (cpu = 0; cpu < setsize; cpu++) {
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if (!CPU_ISSET(cpu, cpu_set))
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continue;
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if (!path_exist(_PATH_SYS_CPU "/cpu%d", cpu)) {
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warnx(_("CPU %u does not exist"), cpu);
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fails++;
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continue;
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}
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if (!path_exist(_PATH_SYS_CPU "/cpu%d/configure", cpu)) {
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warnx(_("CPU %u is not configurable"), cpu);
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fails++;
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continue;
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}
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current = path_read_s32(_PATH_SYS_CPU "/cpu%d/configure", cpu);
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if ((current == 1) && (configure == 1)) {
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printf(_("CPU %u is already configured\n"), cpu);
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continue;
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}
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if ((current == 0) && (configure == 0)) {
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printf(_("CPU %u is already deconfigured\n"), cpu);
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continue;
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}
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if ((current == 1) && (configure == 0) && onlinecpus &&
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is_cpu_online(cpu)) {
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warnx(_("CPU %u deconfigure failed (CPU is enabled)"), cpu);
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fails++;
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continue;
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}
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if (configure) {
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rc = path_write_str("1", _PATH_SYS_CPU "/cpu%d/configure", cpu);
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if (rc == -1) {
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warn(_("CPU %u configure failed"), cpu);
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fails++;
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} else
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printf(_("CPU %u configured\n"), cpu);
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} else {
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rc = path_write_str("0", _PATH_SYS_CPU "/cpu%d/configure", cpu);
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if (rc == -1) {
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warn(_("CPU %u deconfigure failed"), cpu);
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fails++;
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} else
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printf(_("CPU %u deconfigured\n"), cpu);
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}
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}
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return fails == 0 ? 0 : fails == setsize ? -1 : 1;
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}
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static void cpu_parse(char *cpu_string, cpu_set_t *cpu_set, size_t setsize)
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{
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int rc;
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rc = cpulist_parse(cpu_string, cpu_set, setsize, 1);
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if (rc == 0)
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return;
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if (rc == 2)
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errx(EXIT_FAILURE, _("invalid CPU number in CPU list: %s"), cpu_string);
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errx(EXIT_FAILURE, _("failed to parse CPU list: %s"), cpu_string);
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}
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fprintf(out, _(
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"\nUsage:\n"
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" %s [options]\n"), program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Configure CPUs in a multi-processor system.\n"), out);
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fputs(USAGE_OPTIONS, stdout);
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fputs(_(
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" -e, --enable <cpu-list> enable cpus\n"
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" -d, --disable <cpu-list> disable cpus\n"
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" -c, --configure <cpu-list> configure cpus\n"
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" -g, --deconfigure <cpu-list> deconfigure cpus\n"
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" -p, --dispatch <mode> set dispatching mode\n"
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" -r, --rescan trigger rescan of cpus\n"
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), stdout);
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printf(USAGE_HELP_OPTIONS(31));
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printf(USAGE_MAN_TAIL("chcpu(8)"));
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exit(EXIT_SUCCESS);
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}
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int main(int argc, char *argv[])
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{
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cpu_set_t *cpu_set;
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size_t setsize;
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int cmd = -1;
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int c, rc;
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static const struct option longopts[] = {
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{ "configure", required_argument, NULL, 'c' },
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{ "deconfigure",required_argument, NULL, 'g' },
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{ "disable", required_argument, NULL, 'd' },
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{ "dispatch", required_argument, NULL, 'p' },
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{ "enable", required_argument, NULL, 'e' },
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{ "help", no_argument, NULL, 'h' },
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{ "rescan", no_argument, NULL, 'r' },
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{ "version", no_argument, NULL, 'V' },
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{ NULL, 0, NULL, 0 }
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};
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static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
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{ 'c','d','e','g','p' },
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{ 0 }
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};
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int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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maxcpus = get_max_number_of_cpus();
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if (maxcpus < 1)
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errx(EXIT_FAILURE, _("cannot determine NR_CPUS; aborting"));
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if (path_exist(_PATH_SYS_CPU_ONLINE))
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onlinecpus = path_read_cpulist(maxcpus, _PATH_SYS_CPU_ONLINE);
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setsize = CPU_ALLOC_SIZE(maxcpus);
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cpu_set = CPU_ALLOC(maxcpus);
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if (!cpu_set)
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err(EXIT_FAILURE, _("cpuset_alloc failed"));
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while ((c = getopt_long(argc, argv, "c:d:e:g:hp:rV", longopts, NULL)) != -1) {
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err_exclusive_options(c, longopts, excl, excl_st);
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switch (c) {
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case 'c':
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cmd = CMD_CPU_CONFIGURE;
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cpu_parse(argv[optind - 1], cpu_set, setsize);
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break;
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case 'd':
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cmd = CMD_CPU_DISABLE;
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cpu_parse(argv[optind - 1], cpu_set, setsize);
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break;
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case 'e':
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cmd = CMD_CPU_ENABLE;
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cpu_parse(argv[optind - 1], cpu_set, setsize);
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break;
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case 'g':
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cmd = CMD_CPU_DECONFIGURE;
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cpu_parse(argv[optind - 1], cpu_set, setsize);
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break;
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case 'h':
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usage();
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case 'p':
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if (strcmp("horizontal", argv[optind - 1]) == 0)
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cmd = CMD_CPU_DISPATCH_HORIZONTAL;
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else if (strcmp("vertical", argv[optind - 1]) == 0)
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cmd = CMD_CPU_DISPATCH_VERTICAL;
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else
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errx(EXIT_FAILURE, _("unsupported argument: %s"),
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argv[optind -1 ]);
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break;
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case 'r':
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cmd = CMD_CPU_RESCAN;
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break;
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case 'V':
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printf(UTIL_LINUX_VERSION);
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return EXIT_SUCCESS;
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default:
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errtryhelp(EXIT_FAILURE);
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}
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}
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if ((argc == 1) || (argc != optind)) {
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warnx(_("bad usage"));
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errtryhelp(EXIT_FAILURE);
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}
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switch (cmd) {
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case CMD_CPU_ENABLE:
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rc = cpu_enable(cpu_set, maxcpus, 1);
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break;
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case CMD_CPU_DISABLE:
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rc = cpu_enable(cpu_set, maxcpus, 0);
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break;
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case CMD_CPU_CONFIGURE:
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rc = cpu_configure(cpu_set, maxcpus, 1);
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break;
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case CMD_CPU_DECONFIGURE:
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rc = cpu_configure(cpu_set, maxcpus, 0);
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break;
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case CMD_CPU_RESCAN:
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rc = cpu_rescan();
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break;
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case CMD_CPU_DISPATCH_HORIZONTAL:
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rc = cpu_set_dispatch(0);
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break;
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case CMD_CPU_DISPATCH_VERTICAL:
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rc = cpu_set_dispatch(1);
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break;
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default:
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rc = -EINVAL;
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break;
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}
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return rc == 0 ? EXIT_SUCCESS :
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rc < 0 ? EXIT_FAILURE : CHCPU_EXIT_SOMEOK;
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}
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