739 lines
18 KiB
C
739 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Windfarm PowerMac thermal control.
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* Control loops for RackMack3,1 (Xserve G5)
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*
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* Copyright (C) 2012 Benjamin Herrenschmidt, IBM Corp.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <asm/smu.h>
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#include "windfarm.h"
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#include "windfarm_pid.h"
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#include "windfarm_mpu.h"
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#define VERSION "1.0"
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#undef DEBUG
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#undef LOTSA_DEBUG
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#ifdef DEBUG
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#define DBG(args...) printk(args)
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#else
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#define DBG(args...) do { } while(0)
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#endif
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#ifdef LOTSA_DEBUG
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#define DBG_LOTS(args...) printk(args)
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#else
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#define DBG_LOTS(args...) do { } while(0)
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#endif
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/* define this to force CPU overtemp to 60 degree, useful for testing
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* the overtemp code
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*/
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#undef HACKED_OVERTEMP
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/* We currently only handle 2 chips */
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#define NR_CHIPS 2
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#define NR_CPU_FANS 3 * NR_CHIPS
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/* Controls and sensors */
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static struct wf_sensor *sens_cpu_temp[NR_CHIPS];
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static struct wf_sensor *sens_cpu_volts[NR_CHIPS];
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static struct wf_sensor *sens_cpu_amps[NR_CHIPS];
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static struct wf_sensor *backside_temp;
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static struct wf_sensor *slots_temp;
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static struct wf_sensor *dimms_temp;
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static struct wf_control *cpu_fans[NR_CHIPS][3];
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static struct wf_control *backside_fan;
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static struct wf_control *slots_fan;
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static struct wf_control *cpufreq_clamp;
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/* We keep a temperature history for average calculation of 180s */
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#define CPU_TEMP_HIST_SIZE 180
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/* PID loop state */
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static const struct mpu_data *cpu_mpu_data[NR_CHIPS];
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static struct wf_cpu_pid_state cpu_pid[NR_CHIPS];
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static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
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static int cpu_thist_pt;
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static s64 cpu_thist_total;
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static s32 cpu_all_tmax = 100 << 16;
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static struct wf_pid_state backside_pid;
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static int backside_tick;
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static struct wf_pid_state slots_pid;
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static int slots_tick;
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static int slots_speed;
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static struct wf_pid_state dimms_pid;
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static int dimms_output_clamp;
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static int nr_chips;
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static bool have_all_controls;
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static bool have_all_sensors;
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static bool started;
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static int failure_state;
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#define FAILURE_SENSOR 1
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#define FAILURE_FAN 2
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#define FAILURE_PERM 4
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#define FAILURE_LOW_OVERTEMP 8
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#define FAILURE_HIGH_OVERTEMP 16
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/* Overtemp values */
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#define LOW_OVER_AVERAGE 0
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#define LOW_OVER_IMMEDIATE (10 << 16)
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#define LOW_OVER_CLEAR ((-10) << 16)
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#define HIGH_OVER_IMMEDIATE (14 << 16)
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#define HIGH_OVER_AVERAGE (10 << 16)
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#define HIGH_OVER_IMMEDIATE (14 << 16)
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static void cpu_max_all_fans(void)
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{
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int i;
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/* We max all CPU fans in case of a sensor error. We also do the
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* cpufreq clamping now, even if it's supposedly done later by the
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* generic code anyway, we do it earlier here to react faster
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*/
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if (cpufreq_clamp)
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wf_control_set_max(cpufreq_clamp);
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for (i = 0; i < nr_chips; i++) {
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if (cpu_fans[i][0])
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wf_control_set_max(cpu_fans[i][0]);
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if (cpu_fans[i][1])
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wf_control_set_max(cpu_fans[i][1]);
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if (cpu_fans[i][2])
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wf_control_set_max(cpu_fans[i][2]);
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}
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}
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static int cpu_check_overtemp(s32 temp)
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{
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int new_state = 0;
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s32 t_avg, t_old;
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static bool first = true;
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/* First check for immediate overtemps */
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if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) {
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new_state |= FAILURE_LOW_OVERTEMP;
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if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
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printk(KERN_ERR "windfarm: Overtemp due to immediate CPU"
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" temperature !\n");
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}
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if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) {
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new_state |= FAILURE_HIGH_OVERTEMP;
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if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
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printk(KERN_ERR "windfarm: Critical overtemp due to"
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" immediate CPU temperature !\n");
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}
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/*
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* The first time around, initialize the array with the first
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* temperature reading
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*/
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if (first) {
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int i;
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cpu_thist_total = 0;
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for (i = 0; i < CPU_TEMP_HIST_SIZE; i++) {
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cpu_thist[i] = temp;
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cpu_thist_total += temp;
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}
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first = false;
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}
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/*
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* We calculate a history of max temperatures and use that for the
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* overtemp management
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*/
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t_old = cpu_thist[cpu_thist_pt];
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cpu_thist[cpu_thist_pt] = temp;
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cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE;
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cpu_thist_total -= t_old;
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cpu_thist_total += temp;
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t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE;
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DBG_LOTS(" t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
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FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
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/* Now check for average overtemps */
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if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) {
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new_state |= FAILURE_LOW_OVERTEMP;
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if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
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printk(KERN_ERR "windfarm: Overtemp due to average CPU"
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" temperature !\n");
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}
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if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) {
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new_state |= FAILURE_HIGH_OVERTEMP;
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if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
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printk(KERN_ERR "windfarm: Critical overtemp due to"
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" average CPU temperature !\n");
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}
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/* Now handle overtemp conditions. We don't currently use the windfarm
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* overtemp handling core as it's not fully suited to the needs of those
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* new machine. This will be fixed later.
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*/
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if (new_state) {
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/* High overtemp -> immediate shutdown */
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if (new_state & FAILURE_HIGH_OVERTEMP)
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machine_power_off();
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if ((failure_state & new_state) != new_state)
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cpu_max_all_fans();
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failure_state |= new_state;
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} else if ((failure_state & FAILURE_LOW_OVERTEMP) &&
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(temp < (cpu_all_tmax + LOW_OVER_CLEAR))) {
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printk(KERN_ERR "windfarm: Overtemp condition cleared !\n");
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failure_state &= ~FAILURE_LOW_OVERTEMP;
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}
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return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
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}
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static int read_one_cpu_vals(int cpu, s32 *temp, s32 *power)
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{
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s32 dtemp, volts, amps;
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int rc;
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/* Get diode temperature */
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rc = wf_sensor_get(sens_cpu_temp[cpu], &dtemp);
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if (rc) {
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DBG(" CPU%d: temp reading error !\n", cpu);
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return -EIO;
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}
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DBG_LOTS(" CPU%d: temp = %d.%03d\n", cpu, FIX32TOPRINT((dtemp)));
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*temp = dtemp;
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/* Get voltage */
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rc = wf_sensor_get(sens_cpu_volts[cpu], &volts);
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if (rc) {
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DBG(" CPU%d, volts reading error !\n", cpu);
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return -EIO;
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}
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DBG_LOTS(" CPU%d: volts = %d.%03d\n", cpu, FIX32TOPRINT((volts)));
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/* Get current */
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rc = wf_sensor_get(sens_cpu_amps[cpu], &s);
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if (rc) {
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DBG(" CPU%d, current reading error !\n", cpu);
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return -EIO;
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}
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DBG_LOTS(" CPU%d: amps = %d.%03d\n", cpu, FIX32TOPRINT((amps)));
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/* Calculate power */
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/* Scale voltage and current raw sensor values according to fixed scales
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* obtained in Darwin and calculate power from I and V
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*/
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*power = (((u64)volts) * ((u64)amps)) >> 16;
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DBG_LOTS(" CPU%d: power = %d.%03d\n", cpu, FIX32TOPRINT((*power)));
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return 0;
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}
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static void cpu_fans_tick(void)
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{
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int err, cpu, i;
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s32 speed, temp, power, t_max = 0;
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DBG_LOTS("* cpu fans_tick_split()\n");
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for (cpu = 0; cpu < nr_chips; ++cpu) {
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struct wf_cpu_pid_state *sp = &cpu_pid[cpu];
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/* Read current speed */
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wf_control_get(cpu_fans[cpu][0], &sp->target);
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err = read_one_cpu_vals(cpu, &temp, &power);
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if (err) {
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failure_state |= FAILURE_SENSOR;
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cpu_max_all_fans();
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return;
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}
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/* Keep track of highest temp */
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t_max = max(t_max, temp);
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/* Handle possible overtemps */
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if (cpu_check_overtemp(t_max))
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return;
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/* Run PID */
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wf_cpu_pid_run(sp, power, temp);
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DBG_LOTS(" CPU%d: target = %d RPM\n", cpu, sp->target);
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/* Apply DIMMs clamp */
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speed = max(sp->target, dimms_output_clamp);
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/* Apply result to all cpu fans */
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for (i = 0; i < 3; i++) {
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err = wf_control_set(cpu_fans[cpu][i], speed);
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if (err) {
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pr_warn("wf_rm31: Fan %s reports error %d\n",
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cpu_fans[cpu][i]->name, err);
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failure_state |= FAILURE_FAN;
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}
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}
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}
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}
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/* Implementation... */
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static int cpu_setup_pid(int cpu)
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{
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struct wf_cpu_pid_param pid;
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const struct mpu_data *mpu = cpu_mpu_data[cpu];
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s32 tmax, ttarget, ptarget;
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int fmin, fmax, hsize;
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/* Get PID params from the appropriate MPU EEPROM */
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tmax = mpu->tmax << 16;
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ttarget = mpu->ttarget << 16;
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ptarget = ((s32)(mpu->pmaxh - mpu->padjmax)) << 16;
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DBG("wf_72: CPU%d ttarget = %d.%03d, tmax = %d.%03d\n",
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cpu, FIX32TOPRINT(ttarget), FIX32TOPRINT(tmax));
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/* We keep a global tmax for overtemp calculations */
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if (tmax < cpu_all_tmax)
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cpu_all_tmax = tmax;
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/* Set PID min/max by using the rear fan min/max */
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fmin = wf_control_get_min(cpu_fans[cpu][0]);
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fmax = wf_control_get_max(cpu_fans[cpu][0]);
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DBG("wf_72: CPU%d max RPM range = [%d..%d]\n", cpu, fmin, fmax);
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/* History size */
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hsize = min_t(int, mpu->tguardband, WF_PID_MAX_HISTORY);
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DBG("wf_72: CPU%d history size = %d\n", cpu, hsize);
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/* Initialize PID loop */
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pid.interval = 1; /* seconds */
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pid.history_len = hsize;
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pid.gd = mpu->pid_gd;
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pid.gp = mpu->pid_gp;
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pid.gr = mpu->pid_gr;
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pid.tmax = tmax;
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pid.ttarget = ttarget;
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pid.pmaxadj = ptarget;
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pid.min = fmin;
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pid.max = fmax;
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wf_cpu_pid_init(&cpu_pid[cpu], &pid);
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cpu_pid[cpu].target = 4000;
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return 0;
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}
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/* Backside/U3 fan */
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static const struct wf_pid_param backside_param = {
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.interval = 1,
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.history_len = 2,
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.gd = 0x00500000,
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.gp = 0x0004cccc,
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.gr = 0,
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.itarget = 70 << 16,
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.additive = 0,
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.min = 20,
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.max = 100,
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};
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/* DIMMs temperature (clamp the backside fan) */
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static const struct wf_pid_param dimms_param = {
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.interval = 1,
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.history_len = 20,
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.gd = 0,
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.gp = 0,
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.gr = 0x06553600,
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.itarget = 50 << 16,
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.additive = 0,
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.min = 4000,
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.max = 14000,
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};
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static void backside_fan_tick(void)
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{
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s32 temp, dtemp;
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int speed, dspeed, fan_min;
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int err;
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if (!backside_fan || !backside_temp || !dimms_temp || !backside_tick)
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return;
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if (--backside_tick > 0)
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return;
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backside_tick = backside_pid.param.interval;
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DBG_LOTS("* backside fans tick\n");
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/* Update fan speed from actual fans */
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err = wf_control_get(backside_fan, &speed);
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if (!err)
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backside_pid.target = speed;
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err = wf_sensor_get(backside_temp, &temp);
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if (err) {
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printk(KERN_WARNING "windfarm: U3 temp sensor error %d\n",
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err);
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failure_state |= FAILURE_SENSOR;
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wf_control_set_max(backside_fan);
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return;
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}
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speed = wf_pid_run(&backside_pid, temp);
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DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n",
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FIX32TOPRINT(temp), speed);
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err = wf_sensor_get(dimms_temp, &dtemp);
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if (err) {
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printk(KERN_WARNING "windfarm: DIMMs temp sensor error %d\n",
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err);
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failure_state |= FAILURE_SENSOR;
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wf_control_set_max(backside_fan);
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return;
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}
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dspeed = wf_pid_run(&dimms_pid, dtemp);
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dimms_output_clamp = dspeed;
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fan_min = (dspeed * 100) / 14000;
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fan_min = max(fan_min, backside_param.min);
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speed = max(speed, fan_min);
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err = wf_control_set(backside_fan, speed);
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if (err) {
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printk(KERN_WARNING "windfarm: backside fan error %d\n", err);
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failure_state |= FAILURE_FAN;
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}
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}
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static void backside_setup_pid(void)
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{
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/* first time initialize things */
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s32 fmin = wf_control_get_min(backside_fan);
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s32 fmax = wf_control_get_max(backside_fan);
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struct wf_pid_param param;
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param = backside_param;
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param.min = max(param.min, fmin);
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param.max = min(param.max, fmax);
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wf_pid_init(&backside_pid, ¶m);
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param = dimms_param;
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wf_pid_init(&dimms_pid, ¶m);
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backside_tick = 1;
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pr_info("wf_rm31: Backside control loop started.\n");
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}
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/* Slots fan */
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static const struct wf_pid_param slots_param = {
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.interval = 1,
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.history_len = 20,
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.gd = 0,
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.gp = 0,
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.gr = 0x00100000,
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.itarget = 3200000,
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.additive = 0,
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.min = 20,
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.max = 100,
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};
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static void slots_fan_tick(void)
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{
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s32 temp;
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int speed;
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int err;
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if (!slots_fan || !slots_temp || !slots_tick)
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return;
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if (--slots_tick > 0)
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return;
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slots_tick = slots_pid.param.interval;
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DBG_LOTS("* slots fans tick\n");
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err = wf_sensor_get(slots_temp, &temp);
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if (err) {
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pr_warn("wf_rm31: slots temp sensor error %d\n", err);
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failure_state |= FAILURE_SENSOR;
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wf_control_set_max(slots_fan);
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return;
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}
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speed = wf_pid_run(&slots_pid, temp);
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DBG_LOTS("slots PID temp=%d.%.3d speed=%d\n",
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FIX32TOPRINT(temp), speed);
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slots_speed = speed;
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err = wf_control_set(slots_fan, speed);
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if (err) {
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printk(KERN_WARNING "windfarm: slots bay fan error %d\n", err);
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failure_state |= FAILURE_FAN;
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}
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}
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static void slots_setup_pid(void)
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{
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/* first time initialize things */
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s32 fmin = wf_control_get_min(slots_fan);
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s32 fmax = wf_control_get_max(slots_fan);
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struct wf_pid_param param = slots_param;
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param.min = max(param.min, fmin);
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param.max = min(param.max, fmax);
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wf_pid_init(&slots_pid, ¶m);
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slots_tick = 1;
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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 = true;
|
|
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",
|
|
},
|
|
};
|
|
|
|
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");
|