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// SPDX-License-Identifier: GPL-2.0-only
/*
* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
*
* Ideas taken over from the perf userspace tool (included in the Linus
* kernel git repo): subcommand builtins and param parsing.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include "builtin.h"
#include "helpers/helpers.h"
#include "helpers/bitmask.h"
#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
static int cmd_help(int argc, const char **argv);
/* Global cpu_info object available for all binaries
* Info only retrieved from CPU 0
*
* Values will be zero/unknown on non X86 archs
*/
struct cpupower_cpu_info cpupower_cpu_info;
int run_as_root;
int base_cpu;
/* Affected cpus chosen by -c/--cpu param */
struct bitmask *cpus_chosen;
#ifdef DEBUG
int be_verbose;
#endif
static void print_help(void);
struct cmd_struct {
const char *cmd;
int (*main)(int, const char **);
int needs_root;
};
static struct cmd_struct commands[] = {
{ "frequency-info", cmd_freq_info, 0 },
{ "frequency-set", cmd_freq_set, 1 },
{ "idle-info", cmd_idle_info, 0 },
{ "idle-set", cmd_idle_set, 1 },
{ "set", cmd_set, 1 },
{ "info", cmd_info, 0 },
{ "monitor", cmd_monitor, 0 },
{ "help", cmd_help, 0 },
/* { "bench", cmd_bench, 1 }, */
};
static void print_help(void)
{
unsigned int i;
#ifdef DEBUG
printf(_("Usage:\tcpupower [-d|--debug] [-c|--cpu cpulist ] <command> [<args>]\n"));
#else
printf(_("Usage:\tcpupower [-c|--cpu cpulist ] <command> [<args>]\n"));
#endif
printf(_("Supported commands are:\n"));
for (i = 0; i < ARRAY_SIZE(commands); i++)
printf("\t%s\n", commands[i].cmd);
printf(_("\nNot all commands can make use of the -c cpulist option.\n"));
printf(_("\nUse 'cpupower help <command>' for getting help for above commands.\n"));
}
static int print_man_page(const char *subpage)
{
int len;
char *page;
len = 10; /* enough for "cpupower-" */
if (subpage != NULL)
len += strlen(subpage);
page = malloc(len);
if (!page)
return -ENOMEM;
sprintf(page, "cpupower");
if ((subpage != NULL) && strcmp(subpage, "help")) {
strcat(page, "-");
strcat(page, subpage);
}
execlp("man", "man", page, NULL);
/* should not be reached */
return -EINVAL;
}
static int cmd_help(int argc, const char **argv)
{
if (argc > 1) {
print_man_page(argv[1]); /* exits within execlp() */
return EXIT_FAILURE;
}
print_help();
return EXIT_SUCCESS;
}
static void print_version(void)
{
printf(PACKAGE " " VERSION "\n");
printf(_("Report errors and bugs to %s, please.\n"), PACKAGE_BUGREPORT);
}
static void handle_options(int *argc, const char ***argv)
{
int ret, x, new_argc = 0;
if (*argc < 1)
return;
for (x = 0; x < *argc && ((*argv)[x])[0] == '-'; x++) {
const char *param = (*argv)[x];
if (!strcmp(param, "-h") || !strcmp(param, "--help")) {
print_help();
exit(EXIT_SUCCESS);
} else if (!strcmp(param, "-c") || !strcmp(param, "--cpu")) {
if (*argc < 2) {
print_help();
exit(EXIT_FAILURE);
}
if (!strcmp((*argv)[x+1], "all"))
bitmask_setall(cpus_chosen);
else {
ret = bitmask_parselist(
(*argv)[x+1], cpus_chosen);
if (ret < 0) {
fprintf(stderr, _("Error parsing cpu "
"list\n"));
exit(EXIT_FAILURE);
}
}
x += 1;
/* Cut out param: cpupower -c 1 info -> cpupower info */
new_argc += 2;
continue;
} else if (!strcmp(param, "-v") ||
!strcmp(param, "--version")) {
print_version();
exit(EXIT_SUCCESS);
#ifdef DEBUG
} else if (!strcmp(param, "-d") || !strcmp(param, "--debug")) {
be_verbose = 1;
new_argc++;
continue;
#endif
} else {
fprintf(stderr, "Unknown option: %s\n", param);
print_help();
exit(EXIT_FAILURE);
}
}
*argc -= new_argc;
*argv += new_argc;
}
int main(int argc, const char *argv[])
{
const char *cmd;
unsigned int i, ret;
struct stat statbuf;
struct utsname uts;
char pathname[32];
cpus_chosen = bitmask_alloc(sysconf(_SC_NPROCESSORS_CONF));
argc--;
argv += 1;
handle_options(&argc, &argv);
cmd = argv[0];
if (argc < 1) {
print_help();
return EXIT_FAILURE;
}
setlocale(LC_ALL, "");
textdomain(PACKAGE);
/* Turn "perf cmd --help" into "perf help cmd" */
if (argc > 1 && !strcmp(argv[1], "--help")) {
argv[1] = argv[0];
argv[0] = cmd = "help";
}
base_cpu = sched_getcpu();
if (base_cpu < 0) {
fprintf(stderr, _("No valid cpus found.\n"));
return EXIT_FAILURE;
}
get_cpu_info(&cpupower_cpu_info);
run_as_root = !geteuid();
if (run_as_root) {
ret = uname(&uts);
sprintf(pathname, "/dev/cpu/%d/msr", base_cpu);
if (!ret && !strcmp(uts.machine, "x86_64") &&
stat(pathname, &statbuf) != 0) {
if (system("modprobe msr") == -1)
fprintf(stderr, _("MSR access not available.\n"));
}
}
for (i = 0; i < ARRAY_SIZE(commands); i++) {
struct cmd_struct *p = commands + i;
if (strcmp(p->cmd, cmd))
continue;
if (!run_as_root && p->needs_root) {
fprintf(stderr, _("Subcommand %s needs root "
"privileges\n"), cmd);
return EXIT_FAILURE;
}
ret = p->main(argc, argv);
if (cpus_chosen)
bitmask_free(cpus_chosen);
return ret;
}
print_help();
return EXIT_FAILURE;
}
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