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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* Copyright (c) 2009, Intel Corporation.
* All Rights Reserved.
*/
#include <sys/x86_archext.h>
#include <sys/machsystm.h>
#include <sys/archsystm.h>
#include <sys/x_call.h>
#include <sys/acpi/acpi.h>
#include <sys/acpica.h>
#include <sys/speedstep.h>
#include <sys/cpu_acpi.h>
#include <sys/cpupm.h>
#include <sys/dtrace.h>
#include <sys/sdt.h>
typedef struct turbo_kstat_s {
struct kstat_named turbo_supported; /* turbo flag */
struct kstat_named t_mcnt; /* IA32_MPERF_MSR */
struct kstat_named t_acnt; /* IA32_APERF_MSR */
} turbo_kstat_t;
static int turbo_kstat_update(kstat_t *, int);
static void get_turbo_info(cpupm_mach_turbo_info_t *);
static void reset_turbo_info(void);
static void record_turbo_info(cpupm_mach_turbo_info_t *, uint32_t, uint32_t);
static void update_turbo_info(cpupm_mach_turbo_info_t *);
static kmutex_t turbo_mutex;
turbo_kstat_t turbo_kstat = {
{ "turbo_supported", KSTAT_DATA_UINT32 },
{ "turbo_mcnt", KSTAT_DATA_UINT64 },
{ "turbo_acnt", KSTAT_DATA_UINT64 },
};
#define CPU_ACPI_P0 0
#define CPU_IN_TURBO 1
/*
* MSR for hardware coordination feedback mechanism
* - IA32_MPERF: increments in proportion to a fixed frequency
* - IA32_APERF: increments in proportion to actual performance
*/
#define IA32_MPERF_MSR 0xE7
#define IA32_APERF_MSR 0xE8
/*
* kstat update function of the turbo mode info
*/
static int
turbo_kstat_update(kstat_t *ksp, int flag)
{
cpupm_mach_turbo_info_t *turbo_info = ksp->ks_private;
if (flag == KSTAT_WRITE) {
return (EACCES);
}
/*
* update the count in case CPU is in the turbo
* mode for a long time
*/
if (turbo_info->in_turbo == CPU_IN_TURBO)
update_turbo_info(turbo_info);
turbo_kstat.turbo_supported.value.ui32 =
turbo_info->turbo_supported;
turbo_kstat.t_mcnt.value.ui64 = turbo_info->t_mcnt;
turbo_kstat.t_acnt.value.ui64 = turbo_info->t_acnt;
return (0);
}
/*
* update the sum of counts and clear MSRs
*/
static void
update_turbo_info(cpupm_mach_turbo_info_t *turbo_info)
{
ulong_t iflag;
uint64_t mcnt, acnt;
iflag = intr_clear();
mcnt = rdmsr(IA32_MPERF_MSR);
acnt = rdmsr(IA32_APERF_MSR);
wrmsr(IA32_MPERF_MSR, 0);
wrmsr(IA32_APERF_MSR, 0);
turbo_info->t_mcnt += mcnt;
turbo_info->t_acnt += acnt;
intr_restore(iflag);
}
/*
* Get count of MPERF/APERF MSR
*/
static void
get_turbo_info(cpupm_mach_turbo_info_t *turbo_info)
{
ulong_t iflag;
uint64_t mcnt, acnt;
iflag = intr_clear();
mcnt = rdmsr(IA32_MPERF_MSR);
acnt = rdmsr(IA32_APERF_MSR);
turbo_info->t_mcnt += mcnt;
turbo_info->t_acnt += acnt;
intr_restore(iflag);
}
/*
* Clear MPERF/APERF MSR
*/
static void
reset_turbo_info(void)
{
ulong_t iflag;
iflag = intr_clear();
wrmsr(IA32_MPERF_MSR, 0);
wrmsr(IA32_APERF_MSR, 0);
intr_restore(iflag);
}
/*
* sum up the count of one CPU_ACPI_P0 transition
*/
void
cpupm_record_turbo_info(cpupm_mach_turbo_info_t *turbo_info,
uint32_t cur_state, uint32_t req_state)
{
if (!turbo_info->turbo_supported)
return;
/*
* enter P0 state
*/
if (req_state == CPU_ACPI_P0) {
reset_turbo_info();
turbo_info->in_turbo = CPU_IN_TURBO;
}
/*
* Leave P0 state
*/
else if (cur_state == CPU_ACPI_P0) {
turbo_info->in_turbo = 0;
get_turbo_info(turbo_info);
}
}
cpupm_mach_turbo_info_t *
cpupm_turbo_init(cpu_t *cp)
{
cpupm_mach_turbo_info_t *turbo_info;
turbo_info = kmem_zalloc(sizeof (cpupm_mach_turbo_info_t), KM_SLEEP);
turbo_info->turbo_supported = 1;
turbo_info->turbo_ksp = kstat_create("turbo", cp->cpu_id,
"turbo", "misc", KSTAT_TYPE_NAMED,
sizeof (turbo_kstat) / sizeof (kstat_named_t),
KSTAT_FLAG_VIRTUAL);
if (turbo_info->turbo_ksp == NULL) {
cmn_err(CE_NOTE, "kstat_create(turbo) fail");
} else {
turbo_info->turbo_ksp->ks_data = &turbo_kstat;
turbo_info->turbo_ksp->ks_lock = &turbo_mutex;
turbo_info->turbo_ksp->ks_update = turbo_kstat_update;
turbo_info->turbo_ksp->ks_data_size += MAXNAMELEN;
turbo_info->turbo_ksp->ks_private = turbo_info;
kstat_install(turbo_info->turbo_ksp);
}
return (turbo_info);
}
void
cpupm_turbo_fini(cpupm_mach_turbo_info_t *turbo_info)
{
if (turbo_info->turbo_ksp != NULL)
kstat_delete(turbo_info->turbo_ksp);
kmem_free(turbo_info, sizeof (cpupm_mach_turbo_info_t));
}
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