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/* $OpenBSD: p4tcc.c,v 1.1 2003/12/20 18:23:18 tedu Exp $ */
/*
* Copyright (c) 2003 Ted Unangst
* Copyright (c) 2004 Maxim Sobolev <sobomax@FreeBSD.org>
* 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.
*/
/*
* Restrict power consumption by using thermal control circuit.
* This operates independently of speedstep.
* Found on Pentium 4 and later models (feature TM).
*
* References:
* Intel Developer's manual v.3 #245472-012
*
* On some models, the cpu can hang if it's running at a slow speed.
* Workarounds included below.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_cpu.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/power.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
static u_int p4tcc_percentage;
static u_int p4tcc_economy = 13;
static u_int p4tcc_performance = 100;
static struct sysctl_ctx_list p4tcc_sysctl_ctx;
static struct {
u_short level;
u_short rlevel;
u_short reg;
} tcc[] = {
{ 88, 100, 0 },
{ 75, 88, 7 },
{ 63, 75, 6 },
{ 50, 63, 5 },
{ 38, 50, 4 },
{ 25, 38, 3 },
{ 13, 25, 2 },
{ 0, 13, 1 }
};
#define TCC_LEVELS sizeof(tcc) / sizeof(tcc[0])
#define TCC_MAXPERF 100
static u_short
p4tcc_getperf(void)
{
u_int64_t msreg;
int i;
msreg = rdmsr(MSR_THERM_CONTROL);
msreg = (msreg >> 1) & 0x07;
for (i = 0; i < TCC_LEVELS; i++) {
if (msreg == tcc[i].reg)
break;
}
return (tcc[i].rlevel);
}
static void
p4tcc_setperf(u_int percentage)
{
int i;
u_int64_t msreg;
if (percentage > TCC_MAXPERF)
percentage = TCC_MAXPERF;
for (i = 0; i < TCC_LEVELS - 1; i++) {
if (percentage > tcc[i].level)
break;
}
msreg = rdmsr(MSR_THERM_CONTROL);
msreg &= ~0x1e; /* bit 0 reserved */
if (tcc[i].reg != 0)
msreg |= tcc[i].reg << 1 | 1 << 4;
wrmsr(MSR_THERM_CONTROL, msreg);
}
static int
p4tcc_perf_sysctl(SYSCTL_HANDLER_ARGS)
{
u_int percentage;
int error;
p4tcc_percentage = p4tcc_getperf();
percentage = p4tcc_percentage;
error = sysctl_handle_int(oidp, &percentage, 0, req);
if (error || !req->newptr) {
return (error);
}
if (p4tcc_percentage != percentage) {
p4tcc_setperf(percentage);
}
return (error);
}
static void
p4tcc_power_profile(void *arg)
{
int state;
u_int new;
state = power_profile_get_state();
if (state != POWER_PROFILE_PERFORMANCE &&
state != POWER_PROFILE_ECONOMY) {
return;
}
switch (state) {
case POWER_PROFILE_PERFORMANCE:
new = p4tcc_performance;
break;
case POWER_PROFILE_ECONOMY:
new = p4tcc_economy;
break;
default:
new = p4tcc_getperf();
break;
}
if (p4tcc_getperf() != new) {
p4tcc_setperf(new);
}
}
static int
p4tcc_profile_sysctl(SYSCTL_HANDLER_ARGS)
{
u_int32_t *argp;
u_int32_t arg;
int error;
argp = (u_int32_t *)oidp->oid_arg1;
arg = *argp;
error = sysctl_handle_int(oidp, &arg, 0, req);
/* error or no new value */
if ((error != 0) || (req->newptr == NULL))
return (error);
/* range check */
if (arg > TCC_MAXPERF)
arg = TCC_MAXPERF;
/* set new value and possibly switch */
*argp = arg;
p4tcc_power_profile(NULL);
*argp = p4tcc_getperf();
return (0);
}
static void
setup_p4tcc(void *dummy __unused)
{
if ((cpu_feature & (CPUID_ACPI | CPUID_TM)) !=
(CPUID_ACPI | CPUID_TM))
return;
switch (cpu_id & 0xf) {
case 0x22: /* errata O50 P44 and Z21 */
case 0x24:
case 0x25:
case 0x27:
case 0x29:
/* hang with 12.5 */
tcc[TCC_LEVELS - 1].reg = 2;
break;
case 0x07: /* errata N44 and P18 */
case 0x0a:
case 0x12:
case 0x13:
/* hang at 12.5 and 25 */
tcc[TCC_LEVELS - 1].reg = 3;
tcc[TCC_LEVELS - 2].reg = 3;
break;
default:
break;
}
p4tcc_percentage = p4tcc_getperf();
printf("Pentium 4 TCC support enabled, current performance %u%%\n",
p4tcc_percentage);
sysctl_ctx_init(&p4tcc_sysctl_ctx);
SYSCTL_ADD_PROC(&p4tcc_sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_machdep), OID_AUTO,
"cpuperf", CTLTYPE_INT | CTLFLAG_RW,
&p4tcc_percentage, 0, p4tcc_perf_sysctl, "I",
"CPU performance in % of maximum");
SYSCTL_ADD_PROC(&p4tcc_sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_machdep), OID_AUTO,
"cpuperf_performance", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_RW,
&p4tcc_performance, 0, p4tcc_profile_sysctl, "I",
"CPU performance in % of maximum in Performance mode");
SYSCTL_ADD_PROC(&p4tcc_sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_machdep), OID_AUTO,
"cpuperf_economy", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_RW,
&p4tcc_economy, 0, p4tcc_profile_sysctl, "I",
"CPU performance in % of maximum in Economy mode");
/* register performance profile change handler */
EVENTHANDLER_REGISTER(power_profile_change, p4tcc_power_profile, NULL, 0);
}
SYSINIT(setup_p4tcc, SI_SUB_CPU, SI_ORDER_ANY, setup_p4tcc, NULL);
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