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https://github.com/freebsd/freebsd-src
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Implement passive cooling. It is enabled for tz0 by default where
it is available. Reviewed by: njl
This commit is contained in:
Hajimu UMEMOTO
parent
ddf9c4f771
commit
e71de913d8
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=148138
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@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/kthread.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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@ -42,6 +43,8 @@ __FBSDID("$FreeBSD$");
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#include <sys/unistd.h>
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#include <sys/power.h>
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#include "cpufreq_if.h"
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#include "acpi.h"
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#include <dev/acpica/acpivar.h>
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@ -106,8 +109,16 @@ struct acpi_tz_softc {
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struct acpi_tz_zone tz_zone; /*Thermal zone parameters*/
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int tz_validchecks;
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/* passive cooling */
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struct proc *tz_cooling_proc;
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int tz_cooling_enabled;
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int tz_cooling_active;
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int tz_cooling_updated;
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};
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#define CPUFREQ_MAX_LEVELS 64 /* XXX cpufreq should export this */
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static int acpi_tz_probe(device_t dev);
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static int acpi_tz_attach(device_t dev);
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static int acpi_tz_establish(struct acpi_tz_softc *sc);
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@ -118,12 +129,15 @@ static void acpi_tz_getparam(struct acpi_tz_softc *sc, char *node,
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int *data);
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static void acpi_tz_sanity(struct acpi_tz_softc *sc, int *val, char *what);
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static int acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS);
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static int acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS);
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static void acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify,
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void *context);
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static void acpi_tz_signal(struct acpi_tz_softc *sc, int flags);
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static void acpi_tz_timeout(struct acpi_tz_softc *sc, int flags);
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static void acpi_tz_power_profile(void *arg);
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static void acpi_tz_thread(void *arg);
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static int acpi_tz_cooling_is_available(struct acpi_tz_softc *sc);
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static int acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc);
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static device_method_t acpi_tz_methods[] = {
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/* Device interface */
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@ -183,6 +197,20 @@ acpi_tz_attach(device_t dev)
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sc->tz_requested = TZ_ACTIVE_NONE;
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sc->tz_active = TZ_ACTIVE_NONE;
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sc->tz_thflags = TZ_THFLAG_NONE;
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sc->tz_cooling_proc = NULL;
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sc->tz_cooling_active = FALSE;
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sc->tz_cooling_updated = FALSE;
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/*
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* Always attempt to enable passive cooling for tz0. Users can enable
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* it for other zones manually for now.
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*
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* XXX We need to test if multiple zones conflict with each other
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* since cpufreq currently sets all CPUs to the given frequency whereas
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* it's possible for different thermal zones to specify independent
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* settings for multiple CPUs.
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*/
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sc->tz_cooling_enabled = (device_get_unit(dev) == 0);
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/*
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* Parse the current state of the thermal zone and build control
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@ -231,6 +259,9 @@ acpi_tz_attach(device_t dev)
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SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
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OID_AUTO, "active", CTLTYPE_INT | CTLFLAG_RW,
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sc, 0, acpi_tz_active_sysctl, "I", "");
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SYSCTL_ADD_PROC(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
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OID_AUTO, "passive_cooling", CTLTYPE_INT | CTLFLAG_RW,
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sc, 0, acpi_tz_cooling_sysctl, "I", "");
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SYSCTL_ADD_INT(&sc->tz_sysctl_ctx, SYSCTL_CHILDREN(sc->tz_sysctl_tree),
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OID_AUTO, "thermal_flags", CTLFLAG_RD,
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@ -249,8 +280,8 @@ acpi_tz_attach(device_t dev)
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sizeof(sc->tz_zone.ac), "IK", "");
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/*
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* Create our thread; we only need one, it will service all of the
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* thermal zones. Register our power profile event handler.
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* Create thread to service all of the thermal zones. Register
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* our power profile event handler.
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*/
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sc->tz_event = EVENTHANDLER_REGISTER(power_profile_change,
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acpi_tz_power_profile, sc, 0);
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@ -263,6 +294,18 @@ acpi_tz_attach(device_t dev)
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}
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}
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/* Create a thread to handle passive cooling for each zone if enabled. */
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if (sc->tz_cooling_enabled) {
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if (acpi_tz_cooling_is_available(sc)) {
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error = acpi_tz_cooling_thread_start(sc);
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if (error != 0) {
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sc->tz_cooling_enabled = FALSE;
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goto out;
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}
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} else
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sc->tz_cooling_enabled = FALSE;
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}
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/*
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* Flag the event handler for a manual invocation by our timeout.
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* We defer it like this so that the rest of the subsystem has time
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@ -602,6 +645,34 @@ acpi_tz_active_sysctl(SYSCTL_HANDLER_ARGS)
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return (0);
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}
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static int
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acpi_tz_cooling_sysctl(SYSCTL_HANDLER_ARGS)
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{
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struct acpi_tz_softc *sc;
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int enabled, error;
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sc = (struct acpi_tz_softc *)oidp->oid_arg1;
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enabled = sc->tz_cooling_enabled;
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error = sysctl_handle_int(oidp, &enabled, 0, req);
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/* Error or no new value */
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if (error != 0 || req->newptr == NULL)
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return (error);
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if (enabled != TRUE && enabled != FALSE)
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return (EINVAL);
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if (enabled) {
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if (acpi_tz_cooling_is_available(sc))
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error = acpi_tz_cooling_thread_start(sc);
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else
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error = ENODEV;
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if (error)
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enabled = FALSE;
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}
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sc->tz_cooling_enabled = enabled;
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return (error);
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}
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static void
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acpi_tz_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
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{
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@ -768,3 +839,196 @@ acpi_tz_thread(void *arg)
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ACPI_UNLOCK(thermal);
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}
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}
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static int
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acpi_tz_cpufreq_restore(struct acpi_tz_softc *sc)
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{
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device_t dev;
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int error;
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if (!sc->tz_cooling_updated)
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return (0);
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if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL)
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return (ENXIO);
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ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
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"temperature %d.%dC: resuming previous clock speed\n",
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TZ_KELVTOC(sc->tz_temperature));
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error = CPUFREQ_SET(dev, NULL, CPUFREQ_PRIO_KERN);
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if (error == 0)
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sc->tz_cooling_updated = FALSE;
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return (error);
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}
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static int
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acpi_tz_cpufreq_update(struct acpi_tz_softc *sc, int req)
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{
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device_t dev;
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struct cf_level *levels;
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int num_levels, error, freq, desired_freq, perf, i;
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levels = malloc(CPUFREQ_MAX_LEVELS * sizeof(*levels), M_TEMP, M_NOWAIT);
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if (levels == NULL)
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return (ENOMEM);
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/*
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* Find the main device, cpufreq0. We don't yet support independent
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* CPU frequency control on SMP.
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*/
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if ((dev = devclass_get_device(devclass_find("cpufreq"), 0)) == NULL) {
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error = ENXIO;
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goto out;
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}
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/* Get the current frequency. */
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error = CPUFREQ_GET(dev, &levels[0]);
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if (error)
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goto out;
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freq = levels[0].total_set.freq;
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/* Get the current available frequency levels. */
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num_levels = CPUFREQ_MAX_LEVELS;
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error = CPUFREQ_LEVELS(dev, levels, &num_levels);
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if (error) {
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if (error == E2BIG)
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printf("cpufreq: need to increase CPUFREQ_MAX_LEVELS\n");
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goto out;
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}
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/* Calculate the desired frequency as a percent of the max frequency. */
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perf = 100 * freq / levels[0].total_set.freq - req;
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if (perf < 0)
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perf = 0;
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else if (perf > 100)
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perf = 100;
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desired_freq = levels[0].total_set.freq * perf / 100;
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if (desired_freq <= freq) {
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/* Find the closest available frequency, rounding down. */
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for (i = 0; i < num_levels; i++)
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if (levels[i].total_set.freq <= desired_freq)
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break;
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/* If we didn't find a relevant setting, use the lowest. */
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if (i == num_levels)
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i--;
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} else {
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/* Find the closest available frequency, rounding up. */
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for (i = num_levels - 1; i >= 0; i--)
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if (levels[i].total_set.freq >= desired_freq)
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break;
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/* If we didn't find a relevant setting, use the highest. */
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if (i == -1)
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i++;
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}
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/* If we're going to the highest frequency, restore the old setting. */
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if (i == 0) {
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error = acpi_tz_cpufreq_restore(sc);
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if (error == 0)
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sc->tz_cooling_active = FALSE;
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goto out;
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}
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/* If we are going to a new frequency, activate it. */
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if (levels[i].total_set.freq != freq) {
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ACPI_VPRINT(sc->tz_dev, acpi_device_get_parent_softc(sc->tz_dev),
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"temperature %d.%dC: %screasing clock speed "
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"from %d MHz to %d MHz\n",
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TZ_KELVTOC(sc->tz_temperature),
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(freq > levels[i].total_set.freq) ? "de" : "in",
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freq, levels[i].total_set.freq);
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error = CPUFREQ_SET(dev, &levels[i], CPUFREQ_PRIO_KERN);
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if (error == 0)
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sc->tz_cooling_updated = TRUE;
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}
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out:
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if (levels)
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free(levels, M_TEMP);
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return (error);
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}
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/*
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* Passive cooling thread; monitors current temperature according to the
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* cooling interval and calculates whether to scale back CPU frequency.
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*/
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static void
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acpi_tz_cooling_thread(void *arg)
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{
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struct acpi_tz_softc *sc;
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int error, perf, temperature;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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sc = (struct acpi_tz_softc *)arg;
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temperature = sc->tz_temperature;
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while (sc->tz_cooling_enabled) {
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if (sc->tz_temperature >= sc->tz_zone.psv)
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sc->tz_cooling_active = TRUE;
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if (sc->tz_cooling_active) {
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perf = sc->tz_zone.tc1 * (sc->tz_temperature - temperature) +
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sc->tz_zone.tc2 * (sc->tz_temperature - sc->tz_zone.psv);
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perf /= 10;
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if (perf != 0) {
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error = acpi_tz_cpufreq_update(sc, perf);
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/*
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* If error and not simply a higher priority setting was
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* active, disable cooling.
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*/
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if (error != 0 && error != EPERM) {
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device_printf(sc->tz_dev,
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"failed to set new freq, disabling passive cooling\n");
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sc->tz_cooling_enabled = FALSE;
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}
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}
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}
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temperature = sc->tz_temperature;
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tsleep(&sc->tz_cooling_proc, PZERO, "cooling",
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hz * sc->tz_zone.tsp / 10);
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}
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if (sc->tz_cooling_active) {
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acpi_tz_cpufreq_restore(sc);
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sc->tz_cooling_active = FALSE;
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}
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ACPI_LOCK(thermal);
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sc->tz_cooling_proc = NULL;
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ACPI_UNLOCK(thermal);
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kthread_exit(0);
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}
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/*
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* TODO: We ignore _PSL (list of cooling devices) since cpufreq enumerates
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* all CPUs for us. However, it's possible in the future _PSL will
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* reference non-CPU devices so we may want to support it then.
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*/
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static int
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acpi_tz_cooling_is_available(struct acpi_tz_softc *sc)
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{
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return (sc->tz_zone.tc1 != -1 && sc->tz_zone.tc2 != -1 &&
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sc->tz_zone.tsp != -1 && sc->tz_zone.tsp != 0 &&
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sc->tz_zone.psv != -1);
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}
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static int
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acpi_tz_cooling_thread_start(struct acpi_tz_softc *sc)
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{
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int error;
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char name[16];
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error = 0;
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ACPI_LOCK(thermal);
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if (sc->tz_cooling_proc == NULL) {
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snprintf(name, sizeof(name), "acpi_cooling%d",
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device_get_unit(sc->tz_dev));
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error = kthread_create(acpi_tz_cooling_thread, sc,
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&sc->tz_cooling_proc, RFHIGHPID, 0, name);
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if (error != 0)
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device_printf(sc->tz_dev, "could not create thread - %d", error);
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}
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ACPI_UNLOCK(thermal);
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return (error);
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}
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