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/*-
* Copyright (c) 2005 Nate Lawson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Throttle clock frequency by using the thermal control circuit. This
* operates independently of SpeedStep and ACPI throttling and is supported
* on Pentium 4 and later models (feature TM).
*
* Reference: Intel Developer's manual v.3 #245472-012
*
* The original version of this driver was written by Ted Unangst for
* OpenBSD and imported by Maxim Sobolev. It was rewritten by Nate Lawson
* for use with the cpufreq framework.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/x86/cpufreq/p4tcc.c 193530 2009-06-05 18:44:36Z jkim $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#include "cpufreq_if.h"
#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>
#include "acpi_if.h"
struct p4tcc_softc {
device_t dev;
int set_count;
int lowest_val;
int auto_mode;
};
#define TCC_NUM_SETTINGS 8
#define TCC_ENABLE_ONDEMAND (1<<4)
#define TCC_REG_OFFSET 1
#define TCC_SPEED_PERCENT(x) ((10000 * (x)) / TCC_NUM_SETTINGS)
static int p4tcc_features(driver_t *driver, u_int *features);
static void p4tcc_identify(driver_t *driver, device_t parent);
static int p4tcc_probe(device_t dev);
static int p4tcc_attach(device_t dev);
static int p4tcc_settings(device_t dev, struct cf_setting *sets,
int *count);
static int p4tcc_set(device_t dev, const struct cf_setting *set);
static int p4tcc_get(device_t dev, struct cf_setting *set);
static int p4tcc_type(device_t dev, int *type);
static device_method_t p4tcc_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, p4tcc_identify),
DEVMETHOD(device_probe, p4tcc_probe),
DEVMETHOD(device_attach, p4tcc_attach),
/* cpufreq interface */
DEVMETHOD(cpufreq_drv_set, p4tcc_set),
DEVMETHOD(cpufreq_drv_get, p4tcc_get),
DEVMETHOD(cpufreq_drv_type, p4tcc_type),
DEVMETHOD(cpufreq_drv_settings, p4tcc_settings),
/* ACPI interface */
DEVMETHOD(acpi_get_features, p4tcc_features),
{0, 0}
};
static driver_t p4tcc_driver = {
"p4tcc",
p4tcc_methods,
sizeof(struct p4tcc_softc),
};
static devclass_t p4tcc_devclass;
DRIVER_MODULE(p4tcc, cpu, p4tcc_driver, p4tcc_devclass, 0, 0);
static int
p4tcc_features(driver_t *driver, u_int *features)
{
/* Notify the ACPI CPU that we support direct access to MSRs */
*features = ACPI_CAP_THR_MSRS;
return (0);
}
static void
p4tcc_identify(driver_t *driver, device_t parent)
{
if ((cpu_feature & (CPUID_ACPI | CPUID_TM)) != (CPUID_ACPI | CPUID_TM))
return;
/* Make sure we're not being doubly invoked. */
if (device_find_child(parent, "p4tcc", -1) != NULL)
return;
/*
* We attach a p4tcc child for every CPU since settings need to
* be performed on every CPU in the SMP case. See section 13.15.3
* of the IA32 Intel Architecture Software Developer's Manual,
* Volume 3, for more info.
*/
if (BUS_ADD_CHILD(parent, 10, "p4tcc", -1) == NULL)
device_printf(parent, "add p4tcc child failed\n");
}
static int
p4tcc_probe(device_t dev)
{
if (resource_disabled("p4tcc", 0))
return (ENXIO);
device_set_desc(dev, "CPU Frequency Thermal Control");
return (0);
}
static int
p4tcc_attach(device_t dev)
{
struct p4tcc_softc *sc;
struct cf_setting set;
sc = device_get_softc(dev);
sc->dev = dev;
sc->set_count = TCC_NUM_SETTINGS;
/*
* On boot, the TCC is usually in Automatic mode where reading the
* current performance level is likely to produce bogus results.
* We record that state here and don't trust the contents of the
* status MSR until we've set it ourselves.
*/
sc->auto_mode = TRUE;
/*
* XXX: After a cursory glance at various Intel specification
* XXX: updates it seems like these tests for errata is bogus.
* XXX: As far as I can tell, the failure mode is benign, in
* XXX: that cpus with no errata will have their bottom two
* XXX: STPCLK# rates disabled, so rather than waste more time
* XXX: hunting down intel docs, just document it and punt. /phk
*/
switch (cpu_id & 0xff) {
case 0x22:
case 0x24:
case 0x25:
case 0x27:
case 0x29:
/*
* These CPU models hang when set to 12.5%.
* See Errata O50, P44, and Z21.
*/
sc->set_count -= 1;
break;
case 0x07: /* errata N44 and P18 */
case 0x0a:
case 0x12:
case 0x13:
case 0x62: /* Pentium D B1: errata AA21 */
case 0x64: /* Pentium D C1: errata AA21 */
case 0x65: /* Pentium D D0: errata AA21 */
/*
* These CPU models hang when set to 12.5% or 25%.
* See Errata N44, P18l and AA21.
*/
sc->set_count -= 2;
break;
}
sc->lowest_val = TCC_NUM_SETTINGS - sc->set_count + 1;
/*
* Before we finish attach, switch to 100%. It's possible the BIOS
* set us to a lower rate. The user can override this after boot.
*/
set.freq = 10000;
p4tcc_set(dev, &set);
cpufreq_register(dev);
return (0);
}
static int
p4tcc_settings(device_t dev, struct cf_setting *sets, int *count)
{
struct p4tcc_softc *sc;
int i, val;
sc = device_get_softc(dev);
if (sets == NULL || count == NULL)
return (EINVAL);
if (*count < sc->set_count)
return (E2BIG);
/* Return a list of valid settings for this driver. */
memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * sc->set_count);
val = TCC_NUM_SETTINGS;
for (i = 0; i < sc->set_count; i++, val--) {
sets[i].freq = TCC_SPEED_PERCENT(val);
sets[i].dev = dev;
}
*count = sc->set_count;
return (0);
}
static int
p4tcc_set(device_t dev, const struct cf_setting *set)
{
struct p4tcc_softc *sc;
uint64_t mask, msr;
int val;
if (set == NULL)
return (EINVAL);
sc = device_get_softc(dev);
/*
* Validate requested state converts to a setting that is an integer
* from [sc->lowest_val .. TCC_NUM_SETTINGS].
*/
val = set->freq * TCC_NUM_SETTINGS / 10000;
if (val * 10000 != set->freq * TCC_NUM_SETTINGS ||
val < sc->lowest_val || val > TCC_NUM_SETTINGS)
return (EINVAL);
/*
* Read the current register and mask off the old setting and
* On-Demand bit. If the new val is < 100%, set it and the On-Demand
* bit, otherwise just return to Automatic mode.
*/
msr = rdmsr(MSR_THERM_CONTROL);
mask = (TCC_NUM_SETTINGS - 1) << TCC_REG_OFFSET;
msr &= ~(mask | TCC_ENABLE_ONDEMAND);
if (val < TCC_NUM_SETTINGS)
msr |= (val << TCC_REG_OFFSET) | TCC_ENABLE_ONDEMAND;
wrmsr(MSR_THERM_CONTROL, msr);
/*
* Record whether we're now in Automatic or On-Demand mode. We have
* to cache this since there is no reliable way to check if TCC is in
* Automatic mode (i.e., at 100% or possibly 50%). Reading bit 4 of
* the ACPI Thermal Monitor Control Register produces 0 no matter
* what the current mode.
*/
if (msr & TCC_ENABLE_ONDEMAND)
sc->auto_mode = TRUE;
else
sc->auto_mode = FALSE;
return (0);
}
static int
p4tcc_get(device_t dev, struct cf_setting *set)
{
struct p4tcc_softc *sc;
uint64_t msr;
int val;
if (set == NULL)
return (EINVAL);
sc = device_get_softc(dev);
/*
* Read the current register and extract the current setting. If
* in automatic mode, assume we're at TCC_NUM_SETTINGS (100%).
*
* XXX This is not completely reliable since at high temperatures
* the CPU may be automatically throttling to 50% but it's the best
* we can do.
*/
if (!sc->auto_mode) {
msr = rdmsr(MSR_THERM_CONTROL);
val = (msr >> TCC_REG_OFFSET) & (TCC_NUM_SETTINGS - 1);
} else
val = TCC_NUM_SETTINGS;
memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set));
set->freq = TCC_SPEED_PERCENT(val);
set->dev = dev;
return (0);
}
static int
p4tcc_type(device_t dev, int *type)
{
if (type == NULL)
return (EINVAL);
*type = CPUFREQ_TYPE_RELATIVE;
return (0);
}