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MFC 1.54-1.58: Implement passive cooling. It is enabled for tz0 by

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default where it is available.
This commit is contained in:
ume 2005-11-05 06:55:53 +00:00
parent e63cd31ff1
commit 454fec5331
1 changed files with 337 additions and 23 deletions
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360
sys/dev/acpica/acpi_thermal.c
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@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/module.h>
@ -42,6 +43,8 @@ __FBSDID("$FreeBSD$");
#include <sys/unistd.h>
#include <sys/power.h>
#include "cpufreq_if.h"
#include "acpi.h"
#include <dev/acpica/acpivar.h>
@ -92,7 +95,7 @@ struct acpi_tz_softc {
#define TZ_THFLAG_NONE 0
#define TZ_THFLAG_PSV (1<<0)
#define TZ_THFLAG_HOT (1<<2)
#define TZ_THFLAG_CRT (1<<3)
#define TZ_THFLAG_CRT (1<<3)
int tz_flags;
#define TZ_FLAG_NO_SCP (1<<0) /*No _SCP method*/
#define TZ_FLAG_GETPROFILE (1<<1) /*Get power_profile in timeout*/
@ -106,8 +109,18 @@ struct acpi_tz_softc {
struct acpi_tz_zone tz_zone; /*Thermal zone parameters*/
int tz_validchecks;
/* passive cooling */
struct proc *tz_cooling_proc;
int tz_cooling_proc_running;
int tz_cooling_enabled;
int tz_cooling_active;
int tz_cooling_updated;
int tz_cooling_saved_freq;
};
#define CPUFREQ_MAX_LEVELS 64 /* XXX cpufreq should export this */
static int acpi_tz_probe(device_t dev);
static int acpi_tz_attach(device_t dev);
static int acpi_tz_establish(struct acpi_tz_softc *sc);
@ -118,12 +131,15 @@ static void acpi_tz_getparam(struct acpi_tz_softc *sc, char *node,
int *data);
static void acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
static int acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
static int acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS);
static void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify,
void *context);
static void acpi_tz_signal(struct acpi_tz_softc *sc, int flags);
static void acpi_tz_timeout(struct acpi_tz_softc *sc, int flags);
static void acpi_tz_power_profile(void *arg);
static void acpi_tz_thread(void *arg);
static int acpi_tz_cooling_is_available(struct acpi_tz_softc *sc);
static int acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc);
static device_method_t acpi_tz_methods[] = {
/* Device interface */
@ -158,7 +174,7 @@ static int
acpi_tz_probe(device_t dev)
{
int result;
if (acpi_get_type(dev) == ACPI_TYPE_THERMAL && !acpi_disabled("thermal")) {
device_set_desc(dev, "Thermal Zone");
result = -10;
@ -183,6 +199,21 @@ acpi_tz_attach(device_t dev)
sc->tz_requested = TZ_ACTIVE_NONE;
sc->tz_active = TZ_ACTIVE_NONE;
sc->tz_thflags = TZ_THFLAG_NONE;
sc->tz_cooling_proc = NULL;
sc->tz_cooling_proc_running = FALSE;
sc->tz_cooling_active = FALSE;
sc->tz_cooling_updated = FALSE;
/*
* Always attempt to enable passive cooling for tz0. Users can enable
* it for other zones manually for now.
*
* XXX We need to test if multiple zones conflict with each other
* since cpufreq currently sets all CPUs to the given frequency whereas
* it's possible for different thermal zones to specify independent
* settings for multiple CPUs.
*/
sc->tz_cooling_enabled = (device_get_unit(dev) == 0);
/*
* Parse the current state of the thermal zone and build control
@ -195,7 +226,7 @@ acpi_tz_attach(device_t dev)
/*
* Register for any Notify events sent to this zone.
*/
AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
AcpiInstallNotifyHandler(sc->tz_handle, ACPI_DEVICE_NOTIFY,
acpi_tz_notify_handler, sc);
/*
@ -231,7 +262,10 @@ acpi_tz_attach(device_t dev)
SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
sc, 0, acpi_tz_active_sysctl, "I", "");
SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "passive_cooling", CTLTYPE_INT | CTLFLAG_RW,
sc, 0, acpi_tz_cooling_sysctl, "I", "");
SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
OID_AUTO, "thermal_flags", CTLFLAG_RD,
&sc->tz_thflags, 0, "thermal zone flags");
@ -249,8 +283,8 @@ acpi_tz_attach(device_t dev)
sizeof(sc->tz_zone.ac), "IK", "");
/*
* Create our thread; we only need one, it will service all of the
* thermal zones. Register our power profile event handler.
* Create thread to service all of the thermal zones. Register
* our power profile event handler.
*/
sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change,
acpi_tz_power_profile, sc, 0);
@ -263,6 +297,18 @@ acpi_tz_attach(device_t dev)
}
}
/* Create a thread to handle passive cooling for each zone if enabled. */
if (sc->tz_cooling_enabled) {
if (acpi_tz_cooling_is_available(sc)) {
error = acpi_tz_cooling_thread_start(sc);
if (error != 0) {
sc->tz_cooling_enabled = FALSE;
goto out;
}
} else
sc->tz_cooling_enabled = FALSE;
}
/*
* Flag the event handler for a manual invocation by our timeout.
* We defer it like this so that the rest of the subsystem has time
@ -292,7 +338,7 @@ acpi_tz_establish(struct acpi_tz_softc *sc)
ACPI_OBJECT *obj;
int i;
char nbuf[8];
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/* Erase any existing state. */
@ -301,7 +347,14 @@ acpi_tz_establish(struct acpi_tz_softc *sc)
AcpiOsFree(sc->tz_zone.al[i].Pointer);
if (sc->tz_zone.psl.Pointer != NULL)
AcpiOsFree(sc->tz_zone.psl.Pointer);
bzero(&sc->tz_zone, sizeof(sc->tz_zone));
/*
* XXX: We initialize only ACPI_BUFFER to avoid race condition
* with passive cooling thread which refers psv, tc1, tc2 and tsp.
*/
bzero(sc->tz_zone.ac, sizeof(sc->tz_zone.ac));
bzero(sc->tz_zone.al, sizeof(sc->tz_zone.al));
bzero(&sc->tz_zone.psl, sizeof(sc->tz_zone.psl));
/* Evaluate thermal zone parameters. */
for (i = 0; i < TZ_NUMLEVELS; i++) {
@ -361,6 +414,28 @@ acpi_tz_aclevel_string(int active)
return (aclevel_string[active + 1]);
}
/*
* Get the current temperature.
*/
static int
acpi_tz_get_temperature(struct acpi_tz_softc *sc)
{
int temp;
ACPI_STATUS status;
status = acpi_GetInteger(sc->tz_handle, "_TMP", &temp);
if (ACPI_FAILURE(status)) {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"error fetching current temperature -- %s\n",
AcpiFormatException(status));
return (FALSE);
}
ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
sc->tz_temperature = temp;
return (TRUE);
}
/*
* Evaluate the condition of a thermal zone, take appropriate actions.
*/
@ -372,24 +447,17 @@ acpi_tz_monitor(void *Context)
int temp;
int i;
int newactive, newflags;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = (struct acpi_tz_softc *)Context;
/* Get the current temperature. */
status = acpi_GetInteger(sc->tz_handle, "_TMP", &temp);
if (ACPI_FAILURE(status)) {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"error fetching current temperature -- %s\n",
AcpiFormatException(status));
if (!acpi_tz_get_temperature(sc)) {
/* XXX disable zone? go to max cooling? */
return_VOID;
}
ACPI_DEBUG_PRINT((ACPI_DB_VALUES, "got %d.%dC\n", TZ_KELVTOC(temp)));
sc->tz_temperature = temp;
temp = sc->tz_temperature;
/*
* Work out what we ought to be doing right now.
@ -487,7 +555,7 @@ acpi_tz_monitor(void *Context)
}
/*
* Given an object, verify that it's a reference to a device of some sort,
* Given an object, verify that it's a reference to a device of some sort,
* and try to switch it off.
*/
static void
@ -511,7 +579,7 @@ acpi_tz_switch_cooler_off(ACPI_OBJECT *obj, void *arg)
}
/*
* Given an object, verify that it's a reference to a device of some sort,
* Given an object, verify that it's a reference to a device of some sort,
* and try to switch it on.
*
* XXX replication of off/on function code is bad.
@ -522,7 +590,7 @@ acpi_tz_switch_cooler_on(ACPI_OBJECT *obj, void *arg)
struct acpi_tz_softc *sc = (struct acpi_tz_softc *)arg;
ACPI_HANDLE cooler;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
cooler = acpi_GetReference(NULL, obj);
@ -559,7 +627,7 @@ acpi_tz_getparam(struct acpi_tz_softc *sc, char *node, int *data)
acpi_name(sc->tz_handle), node, *data));
}
return_VOID;
return_VOID;
}
/*
@ -578,7 +646,7 @@ acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what)
/*
* Respond to a sysctl on the active state node.
*/
*/
static int
acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
{
@ -602,6 +670,34 @@ acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
return (0);
}
static int
acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)
{
struct acpi_tz_softc *sc;
int enabled, error;
sc = (struct acpi_tz_softc *)oidp->oid_arg1;
enabled = sc->tz_cooling_enabled;
error = sysctl_handle_int(oidp, &enabled, 0, req);
/* Error or no new value */
if (error != 0 || req->newptr == NULL)
return (error);
if (enabled != TRUE && enabled != FALSE)
return (EINVAL);
if (enabled) {
if (acpi_tz_cooling_is_available(sc))
error = acpi_tz_cooling_thread_start(sc);
else
error = ENODEV;
if (error)
enabled = FALSE;
}
sc->tz_cooling_enabled = enabled;
return (error);
}
static void
acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
{
@ -692,7 +788,7 @@ acpi_tz_power_profile(void *arg)
if ((sc->tz_flags & TZ_FLAG_NO_SCP) == 0) {
/* Call _SCP to set the new profile */
status = acpi_SetInteger(sc->tz_handle, "_SCP",
status = acpi_SetInteger(sc->tz_handle, "_SCP",
(state == POWER_PROFILE_PERFORMANCE) ? 0 : 1);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND)
@ -768,3 +864,221 @@ acpi_tz_thread(void *arg)
ACPI_UNLOCK(thermal);
}
}
static int
acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc)
{
device_t dev;
int error;
if (!sc->tz_cooling_updated)
return (0);
if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL)
return (ENXIO);
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"temperature %d.%dC: resuming previous clock speed (%d MHz)\n",
TZ_KELVTOC(sc->tz_temperature), sc->tz_cooling_saved_freq);
error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN);
if (error == 0)
sc->tz_cooling_updated = FALSE;
return (error);
}
static int
acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req)
{
device_t dev;
struct cf_level *levels;
int num_levels, error, freq, desired_freq, perf, i;
levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
if (levels == NULL)
return (ENOMEM);
/*
* Find the main device, cpufreq0. We don't yet support independent
* CPU frequency control on SMP.
*/
if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) {
error = ENXIO;
goto out;
}
/* Get the current frequency. */
error = CPUFREQ_GET(dev, &levels[0]);
if (error)
goto out;
freq = levels[0].total_set.freq;
/* Get the current available frequency levels. */
num_levels = CPUFREQ_MAX_LEVELS;
error = CPUFREQ_LEVELS(dev, levels, &num_levels);
if (error) {
if (error == E2BIG)
printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n");
goto out;
}
/* Calculate the desired frequency as a percent of the max frequency. */
perf = 100 * freq / levels[0].total_set.freq - req;
if (perf < 0)
perf = 0;
else if (perf > 100)
perf = 100;
desired_freq = levels[0].total_set.freq * perf / 100;
if (desired_freq < freq) {
/* Find the closest available frequency, rounding down. */
for (i = 0; i < num_levels; i++)
if (levels[i].total_set.freq <= desired_freq)
break;
/* If we didn't find a relevant setting, use the lowest. */
if (i == num_levels)
i--;
} else {
/* If we didn't decrease frequency yet, don't increase it. */
if (!sc->tz_cooling_updated) {
sc->tz_cooling_active = FALSE;
goto out;
}
/* Use saved cpu frequency as maximum value. */
if (desired_freq > sc->tz_cooling_saved_freq)
desired_freq = sc->tz_cooling_saved_freq;
/* Find the closest available frequency, rounding up. */
for (i = num_levels - 1; i >= 0; i--)
if (levels[i].total_set.freq >= desired_freq)
break;
/* If we didn't find a relevant setting, use the highest. */
if (i == -1)
i++;
/* If we're going to the highest frequency, restore the old setting. */
if (i == 0 || desired_freq == sc->tz_cooling_saved_freq) {
error = acpi_tz_cpufreq_restore(sc);
if (error == 0)
sc->tz_cooling_active = FALSE;
goto out;
}
}
/* If we are going to a new frequency, activate it. */
if (levels[i].total_set.freq != freq) {
ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
"temperature %d.%dC: %screasing clock speed "
"from %d MHz to %d MHz\n",
TZ_KELVTOC(sc->tz_temperature),
(freq > levels[i].total_set.freq) ? "de" : "in",
freq, levels[i].total_set.freq);
error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN);
if (error == 0 && !sc->tz_cooling_updated) {
sc->tz_cooling_saved_freq = freq;
sc->tz_cooling_updated = TRUE;
}
}
out:
if (levels)
free(levels, M_TEMP);
return (error);
}
/*
* Passive cooling thread; monitors current temperature according to the
* cooling interval and calculates whether to scale back CPU frequency.
*/
static void
acpi_tz_cooling_thread(void *arg)
{
struct acpi_tz_softc *sc;
int error, perf, curr_temp, prev_temp;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = (struct acpi_tz_softc *)arg;
prev_temp = sc->tz_temperature;
while (sc->tz_cooling_enabled) {
if (sc->tz_cooling_active)
(void)acpi_tz_get_temperature(sc);
curr_temp = sc->tz_temperature;
if (curr_temp >= sc->tz_zone.psv)
sc->tz_cooling_active = TRUE;
if (sc->tz_cooling_active) {
perf = sc->tz_zone.tc1 * (curr_temp - prev_temp) +
sc->tz_zone.tc2 * (curr_temp - sc->tz_zone.psv);
perf /= 10;
if (perf != 0) {
error = acpi_tz_cpufreq_update(sc, perf);
/*
* If error and not simply a higher priority setting was
* active, disable cooling.
*/
if (error != 0 && error != EPERM) {
device_printf(sc->tz_dev,
"failed to set new freq, disabling passive cooling\n");
sc->tz_cooling_enabled = FALSE;
}
}
}
prev_temp = curr_temp;
tsleep(&sc->tz_cooling_proc, PZERO, "cooling",
hz * sc->tz_zone.tsp / 10);
}
if (sc->tz_cooling_active) {
acpi_tz_cpufreq_restore(sc);
sc->tz_cooling_active = FALSE;
}
sc->tz_cooling_proc = NULL;
ACPI_LOCK(thermal);
sc->tz_cooling_proc_running = FALSE;
ACPI_UNLOCK(thermal);
kthread_exit(0);
}
/*
* TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates
* all CPUs for us. However, it's possible in the future _PSL will
* reference non-CPU devices so we may want to support it then.
*/
static int
acpi_tz_cooling_is_available(struct acpi_tz_softc *sc)
{
return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 &&
sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 &&
sc->tz_zone.psv != -1);
}
static int
acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc)
{
int error;
char name[16];
ACPI_LOCK(thermal);
if (sc->tz_cooling_proc_running) {
ACPI_UNLOCK(thermal);
return (0);
}
sc->tz_cooling_proc_running = TRUE;
ACPI_UNLOCK(thermal);
error = 0;
if (sc->tz_cooling_proc == NULL) {
snprintf(name, sizeof(name), "acpi_cooling%d",
device_get_unit(sc->tz_dev));
error = kthread_create(acpi_tz_cooling_thread, sc,
&sc->tz_cooling_proc, RFHIGHPID, 0, name);
if (error != 0) {
device_printf(sc->tz_dev, "could not create thread - %d", error);
ACPI_LOCK(thermal);
sc->tz_cooling_proc_running = FALSE;
ACPI_UNLOCK(thermal);
}
}
return (error);
}