void fand_interrupt(int sig)
{
int fan;
for (fan = 0; fan < total_fans; fan++) {
write_fan_speed(fan + fan_offset, fan_max);
}
syslog(LOG_WARNING, "Shutting down fand on signal %s", strsignal(sig));
if (sig == SIGUSR1) {
stop_watchdog();
}
exit(3);
}
int server_shutdown(const char *why) {
int fan;
for (fan = 0; fan < total_fans; fan++) {
write_fan_speed(fan + fan_offset, fan_max);
}
syslog(LOG_EMERG, "Shutting down: %s", why);
#if defined(CONFIG_WEDGE100)
write_device(USERVER_POWER, "0");
sleep(5);
write_device(MAIN_POWER, "0");
#endif
#if defined(CONFIG_WEDGE) && !defined(CONFIG_WEDGE100)
write_device(GPIO_USERVER_POWER_DIRECTION, "out");
write_device(GPIO_USERVER_POWER, "0");
/*
* Putting T2 in reset generates a non-maskable interrupt to uS,
* the kernel running on uS might panic depending on its version.
* sleep 5s here to make sure uS is completely down.
*/
sleep(5);
if (write_device(GPIO_T2_POWER_DIRECTION, "out") ||
write_device(GPIO_T2_POWER, "1")) {
/*
* We're here because something has gone badly wrong. If we
* didn't manage to shut down the T2, cut power to the whole box,
* using the PMBus OPERATION register. This will require a power
* cycle (removal of both power inputs) to recover.
*/
syslog(LOG_EMERG, "T2 power off failed; turning off via ADM1278");
system("rmmod adm1275");
system("i2cset -y 12 0x10 0x01 00");
}
#else
// TODO(7088822): try throttling, then shutting down server.
syslog(LOG_EMERG, "Need to implement actual shutdown!\n");
#endif
/*
* We have to stop the watchdog, or the system will be automatically
* rebooted some seconds after fand exits (and stops kicking the
* watchdog).
*/
stop_watchdog();
sleep(2);
exit(2);
}
/*
* Use fuzzy logic type approach to creating the new fan speed.
* if count < cold_limit fan should be off.
* if count > hot_limit fan should be full on.
* if count between limits set proportionally to base speed + proportional element.
*/
static void update_fan_speed(struct thermostat *th)
{
int var = th->temps;
/* remember that var = 1/T ie smaller var higher temperature and faster fan speed needed */
if (abs(var - th->last_var) >= MIN_TEMP_COUNT_CHANGE) {
int new_speed;
if(var < cold_limit){
if (var < hot_limit)
{
th->last_var = var;
/* too hot for proportional control */
new_speed = OXSEMI_FAN_SPEED_RATIO_MAX;
}
else
{
/* fan speed it the user selected starting value for the fan
* so scale operatation from nominal at cold limit to max at hot limit.
*/
new_speed = OXSEMI_FAN_SPEED_RATIO_MAX -
(OXSEMI_FAN_SPEED_RATIO_MAX - min_fan_speed_ratio) * (var - hot_limit)/(cold_limit - hot_limit);
if (th->set_speed == 0 ) th->set_speed = min_fan_speed_ratio;
if ((new_speed - th->set_speed) > MAX_FAN_RATIO_CHANGE)
new_speed = th->set_speed + MAX_FAN_RATIO_CHANGE;
else if ((new_speed - th->set_speed) < -MAX_FAN_RATIO_CHANGE)
new_speed = th->set_speed - MAX_FAN_RATIO_CHANGE;
else
th->last_var = var;
}
}
else {
th->last_var = var;
/* var greater than low limit - too cold for fan. */
new_speed = OXSEMI_FAN_SPEED_RATIO_MIN;
}
write_fan_speed(th, new_speed);
th->set_speed = new_speed;
}
}
static void __exit oxsemi_therm_exit(void)
{
if ( thread_therm )
{
kthread_stop(thread_therm);
}
/* Stop the fan so that it doesnot run anymore - dont reset
* SYS_CTRL_RSTEN_MISC_BIT as other modules may use it
*/
write_fan_speed(thermostat, 0);
remove_proc_entry("therm-fan", NULL);
misc_deregister(&oxsemi_therm_miscdev);
kfree(thermostat);
thermostat = NULL;
}
int main(int argc, char **argv) {
/* Sensor values */
#if defined(CONFIG_WEDGE)
int intake_temp;
int exhaust_temp;
int switch_temp;
int userver_temp;
#else
float intake_temp;
float exhaust_temp;
float userver_temp;
#endif
int fan_speed = fan_high;
int bad_reads = 0;
int fan_failure = 0;
int fan_speed_changes = 0;
int old_speed;
int fan_bad[FANS];
int fan;
unsigned log_count = 0; // How many times have we logged our temps?
int opt;
int prev_fans_bad = 0;
struct sigaction sa;
sa.sa_handler = fand_interrupt;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGUSR1, &sa, NULL);
// Start writing to syslog as early as possible for diag purposes.
openlog("fand", LOG_CONS, LOG_DAEMON);
#if defined(CONFIG_WEDGE) && !defined(CONFIG_WEDGE100)
if (is_two_fan_board(false)) {
/* Alternate, two fan configuration */
total_fans = 2;
fan_offset = 2; /* fan 3 is the first */
fan_low = SIXPACK_FAN_LOW;
fan_medium = SIXPACK_FAN_MEDIUM;
fan_high = SIXPACK_FAN_HIGH;
fan_max = SIXPACK_FAN_MAX;
fan_speed = fan_high;
}
#endif
while ((opt = getopt(argc, argv, "l:m:h:b:t:r:v")) != -1) {
switch (opt) {
case 'l':
fan_low = atoi(optarg);
break;
case 'm':
fan_medium = atoi(optarg);
break;
case 'h':
fan_high = atoi(optarg);
break;
case 'b':
temp_bottom = INTERNAL_TEMPS(atoi(optarg));
break;
case 't':
temp_top = INTERNAL_TEMPS(atoi(optarg));
break;
case 'r':
report_temp = atoi(optarg);
break;
case 'v':
verbose = true;
break;
default:
usage();
break;
}
}
if (optind > argc) {
usage();
}
if (temp_bottom > temp_top) {
fprintf(stderr,
"Should temp-bottom (%d) be higher than "
"temp-top (%d)? Starting anyway.\n",
EXTERNAL_TEMPS(temp_bottom),
EXTERNAL_TEMPS(temp_top));
}
if (fan_low > fan_medium || fan_low > fan_high || fan_medium > fan_high) {
fprintf(stderr,
"fan RPMs not strictly increasing "
"-- %d, %d, %d, starting anyway\n",
fan_low,
fan_medium,
fan_high);
}
daemon(1, 0);
if (verbose) {
syslog(LOG_DEBUG, "Starting up; system should have %d fans.",
total_fans);
}
for (fan = 0; fan < total_fans; fan++) {
fan_bad[fan] = 0;
write_fan_speed(fan + fan_offset, fan_speed);
write_fan_led(fan + fan_offset, FAN_LED_BLUE);
}
#if defined(CONFIG_YOSEMITE)
/* Ensure that we can read from sensors before proceeding. */
int found = 0;
userver_temp = 100;
while (!found) {
for (int node = 1; node <= TOTAL_1S_SERVERS && !found; node++) {
if (!yosemite_sensor_read(node, BIC_SENSOR_SOC_THERM_MARGIN,
&userver_temp) &&
userver_temp < 0) {
syslog(LOG_DEBUG, "SOC_THERM_MARGIN first valid read of %f.",
userver_temp);
found = 1;
}
sleep(5);
}
// XXX: Will it ever be a problem that we don't exit this until
// we see a valid value?
}
#endif
/* Start watchdog in manual mode */
start_watchdog(0);
/* Set watchdog to persistent mode so timer expiry will happen independent
* of this process's liveliness. */
set_persistent_watchdog(WATCHDOG_SET_PERSISTENT);
sleep(5); /* Give the fans time to come up to speed */
while (1) {
int max_temp;
old_speed = fan_speed;
/* Read sensors */
#if defined(CONFIG_WEDGE) || defined(CONFIG_WEDGE100)
read_temp(INTAKE_TEMP_DEVICE, &intake_temp);
read_temp(EXHAUST_TEMP_DEVICE, &exhaust_temp);
read_temp(CHIP_TEMP_DEVICE, &switch_temp);
read_temp(USERVER_TEMP_DEVICE, &userver_temp);
/*
* uServer can be powered down, but all of the rest of the sensors
* should be readable at any time.
*/
if ((intake_temp == BAD_TEMP || exhaust_temp == BAD_TEMP ||
switch_temp == BAD_TEMP)) {
bad_reads++;
}
#else
intake_temp = exhaust_temp = userver_temp = BAD_TEMP;
if (yosemite_sensor_read(FRU_SPB, SP_SENSOR_INLET_TEMP, &intake_temp) ||
yosemite_sensor_read(FRU_SPB, SP_SENSOR_OUTLET_TEMP, &exhaust_temp))
bad_reads++;
/*
* There are a number of 1S servers; any or all of them
* could be powered off and returning no values. Ignore these
* invalid values.
*/
for (int node = 1; node <= TOTAL_1S_SERVERS; node++) {
float new_temp;
if (!yosemite_sensor_read(node, BIC_SENSOR_SOC_THERM_MARGIN,
&new_temp)) {
if (userver_temp < new_temp) {
userver_temp = new_temp;
}
}
// Since the yosemite_sensor_read() times out after 8secs, keep WDT from expiring
kick_watchdog();
}
#endif
if (bad_reads > BAD_READ_THRESHOLD) {
server_shutdown("Some sensors couldn't be read");
}
if (log_count++ % report_temp == 0) {
syslog(LOG_DEBUG,
#if defined(CONFIG_WEDGE) || defined(CONFIG_WEDGE100)
"Temp intake %d, t2 %d, "
" userver %d, exhaust %d, "
"fan speed %d, speed changes %d",
#else
"Temp intake %f, max server %f, exhaust %f, "
"fan speed %d, speed changes %d",
#endif
intake_temp,
#if defined(CONFIG_WEDGE) || defined(CONFIG_WEDGE100)
switch_temp,
#endif
userver_temp,
exhaust_temp,
fan_speed,
fan_speed_changes);
}
/* Protection heuristics */
if (intake_temp > INTAKE_LIMIT) {
server_shutdown("Intake temp limit reached");
}
#if defined(CONFIG_WEDGE) || defined(CONFIG_WEDGE100)
if (switch_temp > SWITCH_LIMIT) {
server_shutdown("T2 temp limit reached");
}
#endif
if (userver_temp + USERVER_TEMP_FUDGE > USERVER_LIMIT) {
server_shutdown("uServer temp limit reached");
}
/*
* Calculate change needed -- we should eventually
* do something more sophisticated, like PID.
*
* We should use the intake temperature to adjust this
* as well.
*/
#if defined(CONFIG_YOSEMITE)
/* Use tables to lookup the new fan speed for Yosemite. */
int intake_speed = temp_to_fan_speed(intake_temp, intake_map,
INTAKE_MAP_SIZE);
int cpu_speed = temp_to_fan_speed(userver_temp, cpu_map, CPU_MAP_SIZE);
if (fan_speed == fan_max && fan_failure != 0) {
/* Don't change a thing */
} else if (intake_speed > cpu_speed) {
fan_speed = intake_speed;
} else {
fan_speed = cpu_speed;
}
#else
/* Other systems use a simpler built-in table to determine fan speed. */
if (switch_temp > userver_temp + USERVER_TEMP_FUDGE) {
max_temp = switch_temp;
} else {
max_temp = userver_temp + USERVER_TEMP_FUDGE;
}
/*
* If recovering from a fan problem, spin down fans gradually in case
* temperatures are still high. Gradual spin down also reduces wear on
* the fans.
*/
if (fan_speed == fan_max) {
if (fan_failure == 0) {
fan_speed = fan_high;
}
} else if (fan_speed == fan_high) {
if (max_temp + COOLDOWN_SLOP < temp_top) {
fan_speed = fan_medium;
}
} else if (fan_speed == fan_medium) {
if (max_temp > temp_top) {
fan_speed = fan_high;
} else if (max_temp + COOLDOWN_SLOP < temp_bottom) {
fan_speed = fan_low;
}
} else {/* low */
if (max_temp > temp_bottom) {
fan_speed = fan_medium;
}
}
#endif
/*
* Update fans only if there are no failed ones. If any fans failed
* earlier, all remaining fans should continue to run at max speed.
*/
if (fan_failure == 0 && fan_speed != old_speed) {
syslog(LOG_NOTICE,
"Fan speed changing from %d to %d",
old_speed,
fan_speed);
fan_speed_changes++;
for (fan = 0; fan < total_fans; fan++) {
write_fan_speed(fan + fan_offset, fan_speed);
}
}
/*
* Wait for some change. Typical I2C temperature sensors
* only provide a new value every second and a half, so
* checking again more quickly than that is a waste.
*
* We also have to wait for the fan changes to take effect
* before measuring them.
*/
sleep(5);
/* Check fan RPMs */
for (fan = 0; fan < total_fans; fan++) {
/*
* Make sure that we're within some percentage
* of the requested speed.
*/
if (fan_speed_okay(fan + fan_offset, fan_speed, FAN_FAILURE_OFFSET)) {
if (fan_bad[fan] > FAN_FAILURE_THRESHOLD) {
write_fan_led(fan + fan_offset, FAN_LED_BLUE);
syslog(LOG_CRIT,
"Fan %d has recovered",
fan);
}
fan_bad[fan] = 0;
} else {
fan_bad[fan]++;
}
}
fan_failure = 0;
for (fan = 0; fan < total_fans; fan++) {
if (fan_bad[fan] > FAN_FAILURE_THRESHOLD) {
fan_failure++;
write_fan_led(fan + fan_offset, FAN_LED_RED);
}
}
if (fan_failure > 0) {
if (prev_fans_bad != fan_failure) {
syslog(LOG_CRIT, "%d fans failed", fan_failure);
}
/*
* If fans are bad, we need to blast all of the
* fans at 100%; we don't bother to turn off
* the bad fans, in case they are all that is left.
*
* Note that we have a temporary bug with setting fans to
* 100% so we only do fan_max = 99%.
*/
fan_speed = fan_max;
for (fan = 0; fan < total_fans; fan++) {
write_fan_speed(fan + fan_offset, fan_speed);
}
#if defined(CONFIG_WEDGE) || defined(CONFIG_WEDGE100)
/*
* On Wedge, we want to shut down everything if none of the fans
* are visible, since there isn't automatic protection to shut
* off the server or switch chip. On other platforms, the CPUs
* generating the heat will automatically turn off, so this is
* unnecessary.
*/
if (fan_failure == total_fans) {
int count = 0;
for (fan = 0; fan < total_fans; fan++) {
if (fan_bad[fan] > FAN_SHUTDOWN_THRESHOLD)
count++;
}
if (count == total_fans) {
server_shutdown("all fans are bad for more than 12 cycles");
}
}
#endif
/*
* Fans can be hot swapped and replaced; in which case the fan daemon
* will automatically detect the new fan and (assuming the new fan isn't
* itself faulty), automatically readjust the speeds for all fans down
* to a more suitable rpm. The fan daemon does not need to be restarted.
*/
}
/* Suppress multiple warnings for similar number of fan failures. */
prev_fans_bad = fan_failure;
/* if everything is fine, restart the watchdog countdown. If this process
* is terminated, the persistent watchdog setting will cause the system
* to reboot after the watchdog timeout. */
kick_watchdog();
}
}
static int __init oxsemi_therm_init(void)
{
struct thermostat* th;
int rc, ret;
if (thermostat)
return 0;
read_reg(SYS_CTRL_RSTEN_CTRL);
/* release fan/tacho from system reset */
*((volatile unsigned long *) SYS_CTRL_RSTEN_CLR_CTRL) = (1UL << SYS_CTRL_RSTEN_MISC_BIT);
/* Pull Down the GPIO 29 from the software */
*((volatile unsigned long *) SYSCTRL_GPIO_PULLUP_CTRL_0) |= TEMP_TACHO_PULLUP_CTRL_VALUE;
*((volatile unsigned long *) SYS_CTRL_GPIO_PRIMSEL_CTRL_0) &= ~(1UL << QUAD_FUNCTION_ENABLE_FAN_PWM);
*((volatile unsigned long *) SYS_CTRL_GPIO_PRIMSEL_CTRL_0) |= (1UL << PRIMARY_FUNCTION_ENABLE_FAN_TACHO);
*((volatile unsigned long *) SYS_CTRL_GPIO_PRIMSEL_CTRL_0) |= (1UL << PRIMARY_FUNCTION_ENABLE_FAN_TEMP);
/* disable secondary use */
*((volatile unsigned long *) SYS_CTRL_GPIO_SECSEL_CTRL_0) &= ~(1UL << QUAD_FUNCTION_ENABLE_FAN_PWM);
/* disable tertiary use */
*((volatile unsigned long *) SYS_CTRL_GPIO_TERTSEL_CTRL_0) &= ~(1UL << QUAD_FUNCTION_ENABLE_FAN_PWM);
/* disable quadinary use */
*((volatile unsigned long *) SYS_CTRL_GPIO_PWMSEL_CTRL_0) |= (1UL << QUAD_FUNCTION_ENABLE_FAN_PWM);
read_reg(SYS_CTRL_RSTEN_CTRL);
read_reg(SYS_CTRL_GPIO_PRIMSEL_CTRL_0);
read_reg(SYS_CTRL_GPIO_SECSEL_CTRL_0);
read_reg(SYS_CTRL_GPIO_TERTSEL_CTRL_0);
th = (struct thermostat *)
kmalloc(sizeof(struct thermostat), GFP_KERNEL);
if (!th)
return -ENOMEM;
memset(th, 0, sizeof(struct thermostat));
init_MUTEX( &th->sem );
rc = read_reg(TACHO_CLOCK_DIVIDER);
if (rc < 0) {
printk(KERN_ERR "thermAndFan: Thermostat failed to read config ");
kfree(th);
return -ENODEV;
}
/* Set the Tacho clock divider up */
write_reg( TACHO_CLOCK_DIVIDER, TACHO_CORE_TACHO_DIVIDER_VALUE );
/* check tacho divider set correctly */
rc = read_reg(TACHO_CLOCK_DIVIDER);
/* Comparing a 10 bit value to a 32 bit return value */
if ((rc & TACHO_CORE_TACHO_DIVIDER_VALUE) != TACHO_CORE_TACHO_DIVIDER_VALUE) {
printk(KERN_ERR "thermAndFan: Set Tacho Divider Value Failed readback:%d\n", rc);
kfree(th);
return -ENODEV;
}
write_reg( PWM_CLOCK_DIVIDER, PWM_CORE_CLK_DIVIDER_VALUE );
printk(KERN_INFO "thermAndFan: initializing - ox810\n");
#ifdef DEBUG
DumpTachoRegisters();
#endif
thermostat = th;
/* Start the thermister measuring */
write_reg( TACHO_THERMISTOR_CONTROL, (1 << TACHO_THERMISTOR_CONTROL_THERM_ENABLE) );
/* Start Speed measuring */
write_reg( TACHO_FAN_SPEED_CONTROL,
(1 << (TACHO_FAN_SPEED_CONTROL_PWM_ENABLE_BASE
+ TACHO_FAN_SPEED_CONTROL_PWM_USED))
| (1 << TACHO_FAN_SPEED_CONTROL_FAN_COUNT_MODE));
/* be sure to really write fan speed the first time */
th->last_speed = -2;
th->last_var = -80;
/* Set fan to initial speed */
write_fan_speed(th, min_fan_speed_ratio);
thread_therm = kthread_run(monitor_task, th, "kfand");
if (thread_therm == ERR_PTR(-ENOMEM)) {
printk(KERN_INFO "thermAndFan: Kthread creation failed\n");
thread_therm = NULL;
return -ENOMEM;
}
ret = misc_register(&oxsemi_therm_miscdev);
if (ret < 0)
return ret;
proc_oxsemi_therm = create_proc_entry("therm-fan", 0, NULL);
if (proc_oxsemi_therm) {
proc_oxsemi_therm->read_proc = oxsemi_therm_read;
} else {
printk(KERN_ERR "therm-fan: unable to register /proc/therm\n");
}
return 0;
}
int main(int argc, char * const argv[]){
/* Parse the command line arguments */
MFC.fork = TRUE;
parse_options(argc, argv);
signal(SIGHUP,Signal_Handler); /* hangup signal */
signal(SIGTERM,Signal_Handler); /* software termination signal from kill */
struct timespec timx,tim1;
openlog("mfc-daemon", LOG_PID, LOG_DAEMON);
MFC.syslog = TRUE;
/* check machine and pidfile*/
MFC.total_cpus = check_cpu();
MFC.total_fans = check_fan();
check_pidfile();
write_pidfile();
MFC.pidfile = TRUE;
if (MFC.fork) {
start_daemon();
}
int fan;
for (fan = 1; fan <= MFC.total_fans; ++fan) {
write_fan_manual(fan, 1);
}
tim1.tv_sec = TV_SEC;
tim1.tv_nsec = TV_NSEC;
//init
int wr_manual=0;
int change_number=0;
int old_fan_speed=-1;
INFO("Start");
int temp = get_cpu_temperature();
int old_temp_change = 0;
int fan_speed=GET_FAN_SPEED(temp);
fan_speed=set_min_max_fan_speed(fan_speed);
for (fan = 1; fan <= MFC.total_fans; ++fan) {
write_fan_speed(fan, fan_speed);
}
while (1){
wr_manual++;
if (wr_manual==9){
for (fan = 1; fan <= MFC.total_fans; ++fan) {
write_fan_manual(fan, 1);
}
wr_manual=0;
}
temp = get_cpu_temperature();
int diff = abs(temp - old_temp_change);
if (diff >= 2){
// temp = average of both cpu's
fan_speed=GET_FAN_SPEED(temp);
fan_speed=set_min_max_fan_speed(fan_speed);
if (fan_speed!=old_fan_speed){
for (fan = 1; fan <= MFC.total_fans; ++fan) {
write_fan_speed(fan, fan_speed);
}
change_number=log_fan_speed(fan_speed,change_number,temp);
old_fan_speed=fan_speed;
}
old_temp_change = temp;
}
if (nanosleep(&tim1,&timx) == -1){
QUIT_DAEMON("Error nanosleep");
}
}
}