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// SPDX-License-Identifier: GPL-2.0
/*
* Intel Speed Select -- Allow speed select to daemonize
* Copyright (c) 2022 Intel Corporation.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <time.h>
#include "isst.h"
static int per_package_levels_info[MAX_PACKAGE_COUNT][MAX_DIE_PER_PACKAGE];
static time_t per_package_levels_tm[MAX_PACKAGE_COUNT][MAX_DIE_PER_PACKAGE];
static void init_levels(void)
{
int i, j;
for (i = 0; i < MAX_PACKAGE_COUNT; ++i)
for (j = 0; j < MAX_DIE_PER_PACKAGE; ++j)
per_package_levels_info[i][j] = -1;
}
void process_level_change(struct isst_id *id)
{
struct isst_pkg_ctdp_level_info ctdp_level;
struct isst_pkg_ctdp pkg_dev;
time_t tm;
int ret;
if (id->pkg < 0 || id->die < 0) {
debug_printf("Invalid package/die info for cpu:%d\n", id->cpu);
return;
}
tm = time(NULL);
if (tm - per_package_levels_tm[id->pkg][id->die] < 2)
return;
per_package_levels_tm[id->pkg][id->die] = tm;
ret = isst_get_ctdp_levels(id, &pkg_dev);
if (ret) {
debug_printf("Can't get tdp levels for cpu:%d\n", id->cpu);
return;
}
debug_printf("Get Config level %d pkg:%d die:%d current_level:%d\n", id->cpu,
id->pkg, id->die, pkg_dev.current_level);
if (pkg_dev.locked) {
debug_printf("config TDP s locked \n");
return;
}
if (per_package_levels_info[id->pkg][id->die] == pkg_dev.current_level)
return;
debug_printf("**Config level change for cpu:%d pkg:%d die:%d from %d to %d\n",
id->cpu, id->pkg, id->die, per_package_levels_info[id->pkg][id->die],
pkg_dev.current_level);
per_package_levels_info[id->pkg][id->die] = pkg_dev.current_level;
ctdp_level.core_cpumask_size =
alloc_cpu_set(&ctdp_level.core_cpumask);
ret = isst_get_coremask_info(id, pkg_dev.current_level, &ctdp_level);
if (ret) {
free_cpu_set(ctdp_level.core_cpumask);
debug_printf("Can't get core_mask:%d\n", id->cpu);
return;
}
if (ctdp_level.cpu_count) {
int i, max_cpus = get_topo_max_cpus();
for (i = 0; i < max_cpus; ++i) {
if (!is_cpu_in_power_domain(i, id))
continue;
if (CPU_ISSET_S(i, ctdp_level.core_cpumask_size, ctdp_level.core_cpumask)) {
fprintf(stderr, "online cpu %d\n", i);
set_cpu_online_offline(i, 1);
} else {
fprintf(stderr, "offline cpu %d\n", i);
set_cpu_online_offline(i, 0);
}
}
}
free_cpu_set(ctdp_level.core_cpumask);
}
static void _poll_for_config_change(struct isst_id *id, void *arg1, void *arg2,
void *arg3, void *arg4)
{
process_level_change(id);
}
static void poll_for_config_change(void)
{
for_each_online_package_in_set(_poll_for_config_change, NULL, NULL,
NULL, NULL);
}
static int done = 0;
static int pid_file_handle;
static void signal_handler(int sig)
{
switch (sig) {
case SIGINT:
case SIGTERM:
done = 1;
hfi_exit();
exit(0);
break;
default:
break;
}
}
static void daemonize(char *rundir, char *pidfile)
{
int pid, sid, i;
char str[10];
struct sigaction sig_actions;
sigset_t sig_set;
int ret;
if (getppid() == 1)
return;
sigemptyset(&sig_set);
sigaddset(&sig_set, SIGCHLD);
sigaddset(&sig_set, SIGTSTP);
sigaddset(&sig_set, SIGTTOU);
sigaddset(&sig_set, SIGTTIN);
sigprocmask(SIG_BLOCK, &sig_set, NULL);
sig_actions.sa_handler = signal_handler;
sigemptyset(&sig_actions.sa_mask);
sig_actions.sa_flags = 0;
sigaction(SIGHUP, &sig_actions, NULL);
sigaction(SIGTERM, &sig_actions, NULL);
sigaction(SIGINT, &sig_actions, NULL);
pid = fork();
if (pid < 0) {
/* Could not fork */
exit(EXIT_FAILURE);
}
if (pid > 0)
exit(EXIT_SUCCESS);
umask(027);
sid = setsid();
if (sid < 0)
exit(EXIT_FAILURE);
/* close all descriptors */
for (i = getdtablesize(); i >= 0; --i)
close(i);
i = open("/dev/null", O_RDWR);
ret = dup(i);
if (ret == -1)
exit(EXIT_FAILURE);
ret = dup(i);
if (ret == -1)
exit(EXIT_FAILURE);
ret = chdir(rundir);
if (ret == -1)
exit(EXIT_FAILURE);
pid_file_handle = open(pidfile, O_RDWR | O_CREAT, 0600);
if (pid_file_handle == -1) {
/* Couldn't open lock file */
exit(1);
}
/* Try to lock file */
#ifdef LOCKF_SUPPORT
if (lockf(pid_file_handle, F_TLOCK, 0) == -1) {
#else
if (flock(pid_file_handle, LOCK_EX|LOCK_NB) < 0) {
#endif
/* Couldn't get lock on lock file */
fprintf(stderr, "Couldn't get lock file %d\n", getpid());
exit(1);
}
snprintf(str, sizeof(str), "%d\n", getpid());
ret = write(pid_file_handle, str, strlen(str));
if (ret == -1)
exit(EXIT_FAILURE);
close(i);
}
int isst_daemon(int debug_mode, int poll_interval, int no_daemon)
{
int ret;
if (!no_daemon && poll_interval < 0 && !debug_mode) {
fprintf(stderr, "OOB mode is enabled and will run as daemon\n");
daemonize((char *) "/tmp/",
(char *)"/tmp/hfi-events.pid");
} else {
signal(SIGINT, signal_handler);
}
init_levels();
if (poll_interval < 0) {
ret = hfi_main();
if (ret) {
fprintf(stderr, "HFI initialization failed\n");
}
fprintf(stderr, "Must specify poll-interval\n");
return ret;
}
debug_printf("Starting loop\n");
while (!done) {
sleep(poll_interval);
poll_for_config_change();
}
return 0;
}
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