Author: nwhitehorn
Date: Sun Feb 21 22:13:57 2010
New Revision: 204180
URL: http://svn.freebsd.org/changeset/base/204180
Log:
Add a simple fan management callout to the SMU driver. This is designed
such that a fancier thermal management algorithm can be run from user
space, but the kernel will at least ensure your machine does not either
sound like a wind tunnel or catch fire.
Modified:
head/sys/powerpc/powermac/smu.c
Modified: head/sys/powerpc/powermac/smu.c
==============================================================================
--- head/sys/powerpc/powermac/smu.c Sun Feb 21 21:03:37 2010
(r204179)
+++ head/sys/powerpc/powermac/smu.c Sun Feb 21 22:13:57 2010
(r204180)
@@ -32,10 +32,12 @@ __FBSDID("$FreeBSD$");
#include <sys/bus.h>
#include <sys/systm.h>
#include <sys/module.h>
+#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/cpu.h>
#include <sys/ctype.h>
#include <sys/kernel.h>
+#include <sys/reboot.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
@@ -58,7 +60,9 @@ struct smu_fan {
cell_t max_rpm;
cell_t unmanaged_rpm;
char location[32];
+
int old_style;
+ int setpoint;
};
struct smu_sensor {
@@ -92,6 +96,9 @@ struct smu_softc {
struct smu_sensor *sc_sensors;
int sc_nsensors;
+ struct callout sc_fanmgt_callout;
+ time_t sc_lastuserchange;
+
/* Calibration data */
uint16_t sc_cpu_diode_scale;
int16_t sc_cpu_diode_offset;
@@ -103,6 +110,10 @@ struct smu_softc {
uint16_t sc_slots_pow_scale;
int16_t sc_slots_pow_offset;
+
+ /* Thermal management parameters */
+ int sc_target_temp; /* Default 55 C */
+ int sc_critical_temp; /* Default 90 C */
};
/* regular bus attachment functions */
@@ -121,6 +132,7 @@ static int smu_get_datablock(device_t de
size_t len);
static void smu_attach_fans(device_t dev, phandle_t fanroot);
static void smu_attach_sensors(device_t dev, phandle_t sensroot);
+static void smu_fanmgt_callout(void *xdev);
/* where to find the doorbell GPIO */
@@ -145,6 +157,7 @@ DRIVER_MODULE(smu, nexus, smu_driver, sm
MALLOC_DEFINE(M_SMU, "smu", "SMU Sensor Information");
#define SMU_MAILBOX 0x8000860c
+#define SMU_FANMGT_INTERVAL 500 /* ms */
/* Command types */
#define SMU_ADC 0xd8
@@ -261,6 +274,24 @@ smu_attach(device_t dev)
sc->sc_slots_pow_scale = (data[4] << 8) + data[5];
sc->sc_slots_pow_offset = (data[6] << 8) + data[7];
+ /*
+ * Set up simple-minded thermal management.
+ */
+ sc->sc_target_temp = 55;
+ sc->sc_critical_temp = 90;
+
+ SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
+ SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
+ "target_temp", CTLTYPE_INT | CTLFLAG_RW, &sc->sc_target_temp,
+ sizeof(int), "Target temperature (C)");
+ SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
+ SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
+ "critical_temp", CTLTYPE_INT | CTLFLAG_RW,
+ &sc->sc_critical_temp, sizeof(int), "Critical temperature (C)");
+
+ callout_init(&sc->sc_fanmgt_callout, 1);
+ smu_fanmgt_callout(dev);
+
return (0);
}
@@ -470,6 +501,9 @@ smu_fan_set_rpm(device_t smu, struct smu
error = smu_run_cmd(smu, &cmd);
}
+ if (error == 0)
+ fan->setpoint = rpm;
+
return (error);
}
@@ -505,6 +539,7 @@ smu_fanrpm_sysctl(SYSCTL_HANDLER_ARGS)
if (error || !req->newptr)
return (error);
+ sc->sc_lastuserchange = time_uptime;
return (smu_fan_set_rpm(smu, fan, rpm));
}
@@ -556,12 +591,11 @@ smu_attach_fans(device_t dev, phandle_t
sizeof(cell_t)) != sizeof(cell_t))
fan->unmanaged_rpm = fan->max_rpm;
+ fan->setpoint = smu_fan_read_rpm(dev, fan);
+
OF_getprop(child, "location", fan->location,
sizeof(fan->location));
-
- /* Make sure it is at a safe value initially */
- //smu_fan_set_rpm(dev, fan, fan->unmanaged_rpm);
-
+
/* Add sysctls */
for (i = 0; i < strlen(fan->location); i++) {
sysctl_name[i] = tolower(fan->location[i]);
@@ -745,3 +779,77 @@ smu_attach_sensors(device_t dev, phandle
}
}
+static int
+ms_to_ticks(int ms)
+{
+ if (hz > 1000)
+ return ms*(hz/1000);
+
+ return ms/(1000/hz);
+}
+
+static void
+smu_fanmgt_callout(void *xdev) {
+ device_t smu = xdev;
+ struct smu_softc *sc;
+ int i, maxtemp, temp, factor;
+
+ sc = device_get_softc(smu);
+
+ if (time_uptime - sc->sc_lastuserchange < 3) {
+ /*
+ * If we have heard from a user process in the last 3 seconds,
+ * go away.
+ */
+
+ callout_reset(&sc->sc_fanmgt_callout,
+ ms_to_ticks(SMU_FANMGT_INTERVAL), smu_fanmgt_callout, smu);
+ return;
+ }
+
+ maxtemp = 0;
+ for (i = 0; i < sc->sc_nsensors; i++) {
+ if (sc->sc_sensors[i].type != SMU_TEMP_SENSOR)
+ continue;
+
+ temp = smu_sensor_read(smu, &sc->sc_sensors[i]);
+ if (temp > maxtemp)
+ maxtemp = temp;
+ }
+
+ if (maxtemp < 10) { /* Bail if no good sensors */
+ for (i = 0; i < sc->sc_nfans; i++)
+ smu_fan_set_rpm(smu, &sc->sc_fans[i],
+ sc->sc_fans[i].unmanaged_rpm);
+ return;
+ }
+
+ if (maxtemp > sc->sc_critical_temp) {
+ device_printf(smu, "WARNING: Current system temperature (%d C) "
+ "exceeds critical temperature (%d C)! Shutting down!\n",
+ maxtemp, sc->sc_critical_temp);
+ shutdown_nice(RB_POWEROFF);
+ }
+
+ if (maxtemp - sc->sc_target_temp > 20)
+ device_printf(smu, "WARNING: Current system temperature (%d C) "
+ "more than 20 degrees over target temperature (%d C)!\n",
+ maxtemp, sc->sc_target_temp);
+
+ if (maxtemp > sc->sc_target_temp)
+ factor = 110;
+ else if (sc->sc_target_temp - maxtemp > 4)
+ factor = 90;
+ else if (sc->sc_target_temp - maxtemp > 1)
+ factor = 95;
+ else
+ factor = 100;
+
+ for (i = 0; i < sc->sc_nfans; i++)
+ smu_fan_set_rpm(smu, &sc->sc_fans[i],
+ (sc->sc_fans[i].setpoint * factor) / 100);
+
+ callout_reset(&sc->sc_fanmgt_callout,
+ ms_to_ticks(SMU_FANMGT_INTERVAL), smu_fanmgt_callout, smu);
+}
+
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