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- /*
- * Windfarm PowerMac thermal control.
- * Control loops for RackMack3,1 (Xserve G5)
- *
- * Copyright (C) 2012 Benjamin Herrenschmidt, IBM Corp.
- *
- * Use and redistribute under the terms of the GNU GPL v2.
- */
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/kernel.h>
- #include <linux/device.h>
- #include <linux/platform_device.h>
- #include <linux/reboot.h>
- #include <asm/prom.h>
- #include <asm/smu.h>
- #include "windfarm.h"
- #include "windfarm_pid.h"
- #include "windfarm_mpu.h"
- #define VERSION "1.0"
- #undef DEBUG
- #undef LOTSA_DEBUG
- #ifdef DEBUG
- #define DBG(args...) printk(args)
- #else
- #define DBG(args...) do { } while(0)
- #endif
- #ifdef LOTSA_DEBUG
- #define DBG_LOTS(args...) printk(args)
- #else
- #define DBG_LOTS(args...) do { } while(0)
- #endif
- /* define this to force CPU overtemp to 60 degree, useful for testing
- * the overtemp code
- */
- #undef HACKED_OVERTEMP
- /* We currently only handle 2 chips */
- #define NR_CHIPS 2
- #define NR_CPU_FANS 3 * NR_CHIPS
- /* Controls and sensors */
- static struct wf_sensor *sens_cpu_temp[NR_CHIPS];
- static struct wf_sensor *sens_cpu_volts[NR_CHIPS];
- static struct wf_sensor *sens_cpu_amps[NR_CHIPS];
- static struct wf_sensor *backside_temp;
- static struct wf_sensor *slots_temp;
- static struct wf_sensor *dimms_temp;
- static struct wf_control *cpu_fans[NR_CHIPS][3];
- static struct wf_control *backside_fan;
- static struct wf_control *slots_fan;
- static struct wf_control *cpufreq_clamp;
- /* We keep a temperature history for average calculation of 180s */
- #define CPU_TEMP_HIST_SIZE 180
- /* PID loop state */
- static const struct mpu_data *cpu_mpu_data[NR_CHIPS];
- static struct wf_cpu_pid_state cpu_pid[NR_CHIPS];
- static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
- static int cpu_thist_pt;
- static s64 cpu_thist_total;
- static s32 cpu_all_tmax = 100 << 16;
- static struct wf_pid_state backside_pid;
- static int backside_tick;
- static struct wf_pid_state slots_pid;
- static int slots_tick;
- static int slots_speed;
- static struct wf_pid_state dimms_pid;
- static int dimms_output_clamp;
- static int nr_chips;
- static bool have_all_controls;
- static bool have_all_sensors;
- static bool started;
- static int failure_state;
- #define FAILURE_SENSOR 1
- #define FAILURE_FAN 2
- #define FAILURE_PERM 4
- #define FAILURE_LOW_OVERTEMP 8
- #define FAILURE_HIGH_OVERTEMP 16
- /* Overtemp values */
- #define LOW_OVER_AVERAGE 0
- #define LOW_OVER_IMMEDIATE (10 << 16)
- #define LOW_OVER_CLEAR ((-10) << 16)
- #define HIGH_OVER_IMMEDIATE (14 << 16)
- #define HIGH_OVER_AVERAGE (10 << 16)
- #define HIGH_OVER_IMMEDIATE (14 << 16)
- static void cpu_max_all_fans(void)
- {
- int i;
- /* We max all CPU fans in case of a sensor error. We also do the
- * cpufreq clamping now, even if it's supposedly done later by the
- * generic code anyway, we do it earlier here to react faster
- */
- if (cpufreq_clamp)
- wf_control_set_max(cpufreq_clamp);
- for (i = 0; i < nr_chips; i++) {
- if (cpu_fans[i][0])
- wf_control_set_max(cpu_fans[i][0]);
- if (cpu_fans[i][1])
- wf_control_set_max(cpu_fans[i][1]);
- if (cpu_fans[i][2])
- wf_control_set_max(cpu_fans[i][2]);
- }
- }
- static int cpu_check_overtemp(s32 temp)
- {
- int new_state = 0;
- s32 t_avg, t_old;
- static bool first = true;
- /* First check for immediate overtemps */
- if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) {
- new_state |= FAILURE_LOW_OVERTEMP;
- if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
- printk(KERN_ERR "windfarm: Overtemp due to immediate CPU"
- " temperature !\n");
- }
- if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) {
- new_state |= FAILURE_HIGH_OVERTEMP;
- if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
- printk(KERN_ERR "windfarm: Critical overtemp due to"
- " immediate CPU temperature !\n");
- }
- /*
- * The first time around, initialize the array with the first
- * temperature reading
- */
- if (first) {
- int i;
- cpu_thist_total = 0;
- for (i = 0; i < CPU_TEMP_HIST_SIZE; i++) {
- cpu_thist[i] = temp;
- cpu_thist_total += temp;
- }
- first = false;
- }
- /*
- * We calculate a history of max temperatures and use that for the
- * overtemp management
- */
- t_old = cpu_thist[cpu_thist_pt];
- cpu_thist[cpu_thist_pt] = temp;
- cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE;
- cpu_thist_total -= t_old;
- cpu_thist_total += temp;
- t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE;
- DBG_LOTS(" t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
- FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
- /* Now check for average overtemps */
- if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) {
- new_state |= FAILURE_LOW_OVERTEMP;
- if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
- printk(KERN_ERR "windfarm: Overtemp due to average CPU"
- " temperature !\n");
- }
- if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) {
- new_state |= FAILURE_HIGH_OVERTEMP;
- if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
- printk(KERN_ERR "windfarm: Critical overtemp due to"
- " average CPU temperature !\n");
- }
- /* Now handle overtemp conditions. We don't currently use the windfarm
- * overtemp handling core as it's not fully suited to the needs of those
- * new machine. This will be fixed later.
- */
- if (new_state) {
- /* High overtemp -> immediate shutdown */
- if (new_state & FAILURE_HIGH_OVERTEMP)
- machine_power_off();
- if ((failure_state & new_state) != new_state)
- cpu_max_all_fans();
- failure_state |= new_state;
- } else if ((failure_state & FAILURE_LOW_OVERTEMP) &&
- (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) {
- printk(KERN_ERR "windfarm: Overtemp condition cleared !\n");
- failure_state &= ~FAILURE_LOW_OVERTEMP;
- }
- return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
- }
- static int read_one_cpu_vals(int cpu, s32 *temp, s32 *power)
- {
- s32 dtemp, volts, amps;
- int rc;
- /* Get diode temperature */
- rc = wf_sensor_get(sens_cpu_temp[cpu], &dtemp);
- if (rc) {
- DBG(" CPU%d: temp reading error !\n", cpu);
- return -EIO;
- }
- DBG_LOTS(" CPU%d: temp = %d.%03d\n", cpu, FIX32TOPRINT((dtemp)));
- *temp = dtemp;
- /* Get voltage */
- rc = wf_sensor_get(sens_cpu_volts[cpu], &volts);
- if (rc) {
- DBG(" CPU%d, volts reading error !\n", cpu);
- return -EIO;
- }
- DBG_LOTS(" CPU%d: volts = %d.%03d\n", cpu, FIX32TOPRINT((volts)));
- /* Get current */
- rc = wf_sensor_get(sens_cpu_amps[cpu], &s);
- if (rc) {
- DBG(" CPU%d, current reading error !\n", cpu);
- return -EIO;
- }
- DBG_LOTS(" CPU%d: amps = %d.%03d\n", cpu, FIX32TOPRINT((amps)));
- /* Calculate power */
- /* Scale voltage and current raw sensor values according to fixed scales
- * obtained in Darwin and calculate power from I and V
- */
- *power = (((u64)volts) * ((u64)amps)) >> 16;
- DBG_LOTS(" CPU%d: power = %d.%03d\n", cpu, FIX32TOPRINT((*power)));
- return 0;
- }
- static void cpu_fans_tick(void)
- {
- int err, cpu, i;
- s32 speed, temp, power, t_max = 0;
- DBG_LOTS("* cpu fans_tick_split()\n");
- for (cpu = 0; cpu < nr_chips; ++cpu) {
- struct wf_cpu_pid_state *sp = &cpu_pid[cpu];
- /* Read current speed */
- wf_control_get(cpu_fans[cpu][0], &sp->target);
- err = read_one_cpu_vals(cpu, &temp, &power);
- if (err) {
- failure_state |= FAILURE_SENSOR;
- cpu_max_all_fans();
- return;
- }
- /* Keep track of highest temp */
- t_max = max(t_max, temp);
- /* Handle possible overtemps */
- if (cpu_check_overtemp(t_max))
- return;
- /* Run PID */
- wf_cpu_pid_run(sp, power, temp);
- DBG_LOTS(" CPU%d: target = %d RPM\n", cpu, sp->target);
- /* Apply DIMMs clamp */
- speed = max(sp->target, dimms_output_clamp);
- /* Apply result to all cpu fans */
- for (i = 0; i < 3; i++) {
- err = wf_control_set(cpu_fans[cpu][i], speed);
- if (err) {
- pr_warning("wf_rm31: Fan %s reports error %d\n",
- cpu_fans[cpu][i]->name, err);
- failure_state |= FAILURE_FAN;
- }
- }
- }
- }
- /* Implementation... */
- static int cpu_setup_pid(int cpu)
- {
- struct wf_cpu_pid_param pid;
- const struct mpu_data *mpu = cpu_mpu_data[cpu];
- s32 tmax, ttarget, ptarget;
- int fmin, fmax, hsize;
- /* Get PID params from the appropriate MPU EEPROM */
- tmax = mpu->tmax << 16;
- ttarget = mpu->ttarget << 16;
- ptarget = ((s32)(mpu->pmaxh - mpu->padjmax)) << 16;
- DBG("wf_72: CPU%d ttarget = %d.%03d, tmax = %d.%03d\n",
- cpu, FIX32TOPRINT(ttarget), FIX32TOPRINT(tmax));
- /* We keep a global tmax for overtemp calculations */
- if (tmax < cpu_all_tmax)
- cpu_all_tmax = tmax;
- /* Set PID min/max by using the rear fan min/max */
- fmin = wf_control_get_min(cpu_fans[cpu][0]);
- fmax = wf_control_get_max(cpu_fans[cpu][0]);
- DBG("wf_72: CPU%d max RPM range = [%d..%d]\n", cpu, fmin, fmax);
- /* History size */
- hsize = min_t(int, mpu->tguardband, WF_PID_MAX_HISTORY);
- DBG("wf_72: CPU%d history size = %d\n", cpu, hsize);
- /* Initialize PID loop */
- pid.interval = 1; /* seconds */
- pid.history_len = hsize;
- pid.gd = mpu->pid_gd;
- pid.gp = mpu->pid_gp;
- pid.gr = mpu->pid_gr;
- pid.tmax = tmax;
- pid.ttarget = ttarget;
- pid.pmaxadj = ptarget;
- pid.min = fmin;
- pid.max = fmax;
- wf_cpu_pid_init(&cpu_pid[cpu], &pid);
- cpu_pid[cpu].target = 4000;
-
- return 0;
- }
- /* Backside/U3 fan */
- static struct wf_pid_param backside_param = {
- .interval = 1,
- .history_len = 2,
- .gd = 0x00500000,
- .gp = 0x0004cccc,
- .gr = 0,
- .itarget = 70 << 16,
- .additive = 0,
- .min = 20,
- .max = 100,
- };
- /* DIMMs temperature (clamp the backside fan) */
- static struct wf_pid_param dimms_param = {
- .interval = 1,
- .history_len = 20,
- .gd = 0,
- .gp = 0,
- .gr = 0x06553600,
- .itarget = 50 << 16,
- .additive = 0,
- .min = 4000,
- .max = 14000,
- };
- static void backside_fan_tick(void)
- {
- s32 temp, dtemp;
- int speed, dspeed, fan_min;
- int err;
- if (!backside_fan || !backside_temp || !dimms_temp || !backside_tick)
- return;
- if (--backside_tick > 0)
- return;
- backside_tick = backside_pid.param.interval;
- DBG_LOTS("* backside fans tick\n");
- /* Update fan speed from actual fans */
- err = wf_control_get(backside_fan, &speed);
- if (!err)
- backside_pid.target = speed;
- err = wf_sensor_get(backside_temp, &temp);
- if (err) {
- printk(KERN_WARNING "windfarm: U3 temp sensor error %d\n",
- err);
- failure_state |= FAILURE_SENSOR;
- wf_control_set_max(backside_fan);
- return;
- }
- speed = wf_pid_run(&backside_pid, temp);
- DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n",
- FIX32TOPRINT(temp), speed);
- err = wf_sensor_get(dimms_temp, &dtemp);
- if (err) {
- printk(KERN_WARNING "windfarm: DIMMs temp sensor error %d\n",
- err);
- failure_state |= FAILURE_SENSOR;
- wf_control_set_max(backside_fan);
- return;
- }
- dspeed = wf_pid_run(&dimms_pid, dtemp);
- dimms_output_clamp = dspeed;
- fan_min = (dspeed * 100) / 14000;
- fan_min = max(fan_min, backside_param.min);
- speed = max(speed, fan_min);
- err = wf_control_set(backside_fan, speed);
- if (err) {
- printk(KERN_WARNING "windfarm: backside fan error %d\n", err);
- failure_state |= FAILURE_FAN;
- }
- }
- static void backside_setup_pid(void)
- {
- /* first time initialize things */
- s32 fmin = wf_control_get_min(backside_fan);
- s32 fmax = wf_control_get_max(backside_fan);
- struct wf_pid_param param;
- param = backside_param;
- param.min = max(param.min, fmin);
- param.max = min(param.max, fmax);
- wf_pid_init(&backside_pid, ¶m);
- param = dimms_param;
- wf_pid_init(&dimms_pid, ¶m);
- backside_tick = 1;
- pr_info("wf_rm31: Backside control loop started.\n");
- }
- /* Slots fan */
- static const struct wf_pid_param slots_param = {
- .interval = 1,
- .history_len = 20,
- .gd = 0,
- .gp = 0,
- .gr = 0x00100000,
- .itarget = 3200000,
- .additive = 0,
- .min = 20,
- .max = 100,
- };
- static void slots_fan_tick(void)
- {
- s32 temp;
- int speed;
- int err;
- if (!slots_fan || !slots_temp || !slots_tick)
- return;
- if (--slots_tick > 0)
- return;
- slots_tick = slots_pid.param.interval;
- DBG_LOTS("* slots fans tick\n");
- err = wf_sensor_get(slots_temp, &temp);
- if (err) {
- pr_warning("wf_rm31: slots temp sensor error %d\n", err);
- failure_state |= FAILURE_SENSOR;
- wf_control_set_max(slots_fan);
- return;
- }
- speed = wf_pid_run(&slots_pid, temp);
- DBG_LOTS("slots PID temp=%d.%.3d speed=%d\n",
- FIX32TOPRINT(temp), speed);
- slots_speed = speed;
- err = wf_control_set(slots_fan, speed);
- if (err) {
- printk(KERN_WARNING "windfarm: slots bay fan error %d\n", err);
- failure_state |= FAILURE_FAN;
- }
- }
- static void slots_setup_pid(void)
- {
- /* first time initialize things */
- s32 fmin = wf_control_get_min(slots_fan);
- s32 fmax = wf_control_get_max(slots_fan);
- struct wf_pid_param param = slots_param;
- param.min = max(param.min, fmin);
- param.max = min(param.max, fmax);
- wf_pid_init(&slots_pid, ¶m);
- slots_tick = 1;
- pr_info("wf_rm31: Slots control loop started.\n");
- }
- static void set_fail_state(void)
- {
- cpu_max_all_fans();
- if (backside_fan)
- wf_control_set_max(backside_fan);
- if (slots_fan)
- wf_control_set_max(slots_fan);
- }
- static void rm31_tick(void)
- {
- int i, last_failure;
- if (!started) {
- started = 1;
- printk(KERN_INFO "windfarm: CPUs control loops started.\n");
- for (i = 0; i < nr_chips; ++i) {
- if (cpu_setup_pid(i) < 0) {
- failure_state = FAILURE_PERM;
- set_fail_state();
- break;
- }
- }
- DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax));
- backside_setup_pid();
- slots_setup_pid();
- #ifdef HACKED_OVERTEMP
- cpu_all_tmax = 60 << 16;
- #endif
- }
- /* Permanent failure, bail out */
- if (failure_state & FAILURE_PERM)
- return;
- /*
- * Clear all failure bits except low overtemp which will be eventually
- * cleared by the control loop itself
- */
- last_failure = failure_state;
- failure_state &= FAILURE_LOW_OVERTEMP;
- backside_fan_tick();
- slots_fan_tick();
- /* We do CPUs last because they can be clamped high by
- * DIMM temperature
- */
- cpu_fans_tick();
- DBG_LOTS(" last_failure: 0x%x, failure_state: %x\n",
- last_failure, failure_state);
- /* Check for failures. Any failure causes cpufreq clamping */
- if (failure_state && last_failure == 0 && cpufreq_clamp)
- wf_control_set_max(cpufreq_clamp);
- if (failure_state == 0 && last_failure && cpufreq_clamp)
- wf_control_set_min(cpufreq_clamp);
- /* That's it for now, we might want to deal with other failures
- * differently in the future though
- */
- }
- static void rm31_new_control(struct wf_control *ct)
- {
- bool all_controls;
- if (!strcmp(ct->name, "cpu-fan-a-0"))
- cpu_fans[0][0] = ct;
- else if (!strcmp(ct->name, "cpu-fan-b-0"))
- cpu_fans[0][1] = ct;
- else if (!strcmp(ct->name, "cpu-fan-c-0"))
- cpu_fans[0][2] = ct;
- else if (!strcmp(ct->name, "cpu-fan-a-1"))
- cpu_fans[1][0] = ct;
- else if (!strcmp(ct->name, "cpu-fan-b-1"))
- cpu_fans[1][1] = ct;
- else if (!strcmp(ct->name, "cpu-fan-c-1"))
- cpu_fans[1][2] = ct;
- else if (!strcmp(ct->name, "backside-fan"))
- backside_fan = ct;
- else if (!strcmp(ct->name, "slots-fan"))
- slots_fan = ct;
- else if (!strcmp(ct->name, "cpufreq-clamp"))
- cpufreq_clamp = ct;
- all_controls =
- cpu_fans[0][0] &&
- cpu_fans[0][1] &&
- cpu_fans[0][2] &&
- backside_fan &&
- slots_fan;
- if (nr_chips > 1)
- all_controls &=
- cpu_fans[1][0] &&
- cpu_fans[1][1] &&
- cpu_fans[1][2];
- have_all_controls = all_controls;
- }
- static void rm31_new_sensor(struct wf_sensor *sr)
- {
- bool all_sensors;
- if (!strcmp(sr->name, "cpu-diode-temp-0"))
- sens_cpu_temp[0] = sr;
- else if (!strcmp(sr->name, "cpu-diode-temp-1"))
- sens_cpu_temp[1] = sr;
- else if (!strcmp(sr->name, "cpu-voltage-0"))
- sens_cpu_volts[0] = sr;
- else if (!strcmp(sr->name, "cpu-voltage-1"))
- sens_cpu_volts[1] = sr;
- else if (!strcmp(sr->name, "cpu-current-0"))
- sens_cpu_amps[0] = sr;
- else if (!strcmp(sr->name, "cpu-current-1"))
- sens_cpu_amps[1] = sr;
- else if (!strcmp(sr->name, "backside-temp"))
- backside_temp = sr;
- else if (!strcmp(sr->name, "slots-temp"))
- slots_temp = sr;
- else if (!strcmp(sr->name, "dimms-temp"))
- dimms_temp = sr;
- all_sensors =
- sens_cpu_temp[0] &&
- sens_cpu_volts[0] &&
- sens_cpu_amps[0] &&
- backside_temp &&
- slots_temp &&
- dimms_temp;
- if (nr_chips > 1)
- all_sensors &=
- sens_cpu_temp[1] &&
- sens_cpu_volts[1] &&
- sens_cpu_amps[1];
- have_all_sensors = all_sensors;
- }
- static int rm31_wf_notify(struct notifier_block *self,
- unsigned long event, void *data)
- {
- switch (event) {
- case WF_EVENT_NEW_SENSOR:
- rm31_new_sensor(data);
- break;
- case WF_EVENT_NEW_CONTROL:
- rm31_new_control(data);
- break;
- case WF_EVENT_TICK:
- if (have_all_controls && have_all_sensors)
- rm31_tick();
- }
- return 0;
- }
- static struct notifier_block rm31_events = {
- .notifier_call = rm31_wf_notify,
- };
- static int wf_rm31_probe(struct platform_device *dev)
- {
- wf_register_client(&rm31_events);
- return 0;
- }
- static int wf_rm31_remove(struct platform_device *dev)
- {
- wf_unregister_client(&rm31_events);
- /* should release all sensors and controls */
- return 0;
- }
- static struct platform_driver wf_rm31_driver = {
- .probe = wf_rm31_probe,
- .remove = wf_rm31_remove,
- .driver = {
- .name = "windfarm",
- .owner = THIS_MODULE,
- },
- };
- static int __init wf_rm31_init(void)
- {
- struct device_node *cpu;
- int i;
- if (!of_machine_is_compatible("RackMac3,1"))
- return -ENODEV;
- /* Count the number of CPU cores */
- nr_chips = 0;
- for_each_node_by_type(cpu, "cpu")
- ++nr_chips;
- if (nr_chips > NR_CHIPS)
- nr_chips = NR_CHIPS;
- pr_info("windfarm: Initializing for desktop G5 with %d chips\n",
- nr_chips);
- /* Get MPU data for each CPU */
- for (i = 0; i < nr_chips; i++) {
- cpu_mpu_data[i] = wf_get_mpu(i);
- if (!cpu_mpu_data[i]) {
- pr_err("wf_rm31: Failed to find MPU data for CPU %d\n", i);
- return -ENXIO;
- }
- }
- #ifdef MODULE
- request_module("windfarm_fcu_controls");
- request_module("windfarm_lm75_sensor");
- request_module("windfarm_lm87_sensor");
- request_module("windfarm_ad7417_sensor");
- request_module("windfarm_max6690_sensor");
- request_module("windfarm_cpufreq_clamp");
- #endif /* MODULE */
- platform_driver_register(&wf_rm31_driver);
- return 0;
- }
- static void __exit wf_rm31_exit(void)
- {
- platform_driver_unregister(&wf_rm31_driver);
- }
- module_init(wf_rm31_init);
- module_exit(wf_rm31_exit);
- MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
- MODULE_DESCRIPTION("Thermal control for Xserve G5");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:windfarm");
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