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/*
* Copyright 2009, Intel Corporation
* Copyright 2009, Sun Microsystems, Inc
*
* This file is part of PowerTOP
*
* This program file is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program in a file named COPYING; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
* Eric C Saxe <eric.saxe@sun.com>
* Aubrey Li <aubrey.li@intel.com>
*/
/*
* GPL Disclaimer
*
* For the avoidance of doubt, except that if any license choice other
* than GPL or LGPL is available it will apply instead, Sun elects to
* use only the General Public License version 2 (GPLv2) at this time
* for any software where a choice of GPL license versions is made
* available with the language indicating that GPLv2 or any later
* version may be used, or where a choice of which version of the GPL
* is applied is otherwise unspecified.
*/
#include <stdlib.h>
#include <string.h>
#include <dtrace.h>
#include <kstat.h>
#include <errno.h>
#include "powertop.h"
/*
* Global turbo related variables definitions
*/
boolean_t g_turbo_supported;
double g_turbo_ratio;
/*
* The variables to store kstat snapshot
*/
static turbo_info_t *cpu_turbo_info = NULL;
static turbo_info_t *t_new = NULL;
/*
* Perform setup necessary to enumerate and track CPU turbo information
*/
static int
pt_turbo_init(void)
{
kstat_ctl_t *kc;
kstat_t *ksp;
kstat_named_t *knp;
/*
* check if the CPU turbo is supported
*/
if ((kc = kstat_open()) == NULL) {
g_turbo_supported = B_FALSE;
return (errno);
}
ksp = kstat_lookup(kc, "turbo", 0, NULL);
if (ksp == NULL) {
g_turbo_supported = B_FALSE;
(void) kstat_close(kc);
return (-1);
}
(void) kstat_read(kc, ksp, NULL);
knp = kstat_data_lookup(ksp, "turbo_supported");
if (knp == NULL) {
pt_error("couldn't find 'turbo_supported' kstat\n");
g_turbo_supported = B_FALSE;
(void) kstat_close(kc);
return (-2);
}
/*
* Initialize turbo information structure if turbo mode is supported
*/
if (knp->value.ui32) {
g_turbo_supported = B_TRUE;
cpu_turbo_info = calloc((size_t)g_ncpus, sizeof (turbo_info_t));
t_new = calloc((size_t)g_ncpus, sizeof (turbo_info_t));
}
(void) kstat_close(kc);
return (0);
}
/*
* Take a snapshot of each CPU's turbo information
* by looking through the turbo kstats.
*/
static int
pt_turbo_snapshot(turbo_info_t *turbo_snapshot)
{
kstat_ctl_t *kc;
kstat_t *ksp;
kstat_named_t *knp;
int cpu;
turbo_info_t *turbo_info;
if ((kc = kstat_open()) == NULL)
return (errno);
for (cpu = 0; cpu < g_ncpus; cpu++) {
turbo_info = &turbo_snapshot[cpu];
ksp = kstat_lookup(kc, "turbo", g_cpu_table[cpu], NULL);
if (ksp == NULL) {
pt_error("couldn't find 'turbo' kstat for CPU %d\n",
cpu);
(void) kstat_close(kc);
return (-1);
}
if (kstat_read(kc, ksp, NULL) == -1) {
pt_error("couldn't read 'turbo' kstat for CPU %d\n",
cpu);
(void) kstat_close(kc);
return (-2);
}
knp = kstat_data_lookup(ksp, "turbo_mcnt");
if (knp == NULL) {
pt_error("couldn't find 'turbo_mcnt' kstat for CPU "
"%d\n", cpu);
(void) kstat_close(kc);
return (-3);
}
/*
* snapshot IA32_MPERF_MSR
*/
turbo_info->t_mcnt = knp->value.ui64;
knp = kstat_data_lookup(ksp, "turbo_acnt");
if (knp == NULL) {
pt_error("couldn't find 'turbo_acnt' kstat for CPU "
"%d\n", cpu);
(void) kstat_close(kc);
return (-4);
}
/*
* snapshot IA32_APERF_MSR
*/
turbo_info->t_acnt = knp->value.ui64;
}
if (kstat_close(kc) != 0)
pt_error("couldn't close 'turbo' kstat\n");
return (0);
}
/*
* Turbo support checking and information initialization
*/
int
pt_turbo_stat_prepare(void)
{
int ret = 0;
if ((ret = pt_turbo_init()) != 0)
return (ret);
if ((ret = pt_turbo_snapshot(cpu_turbo_info)) != 0)
pt_error("failed to snapshot 'turbo' kstat\n");
return (ret);
}
/*
* When doing the statistics collection, we compare two kstat snapshot
* and get a delta. the final ratio of performance boost will be worked
* out according to the kstat delta
*/
int
pt_turbo_stat_collect(void)
{
int cpu;
uint64_t delta_mcnt, delta_acnt;
double ratio;
int ret;
/*
* Take a snapshot of turbo information to setup turbo_info_t
* structure
*/
if ((ret = pt_turbo_snapshot(t_new)) != 0) {
pt_error("failed to snapshot 'turbo' kstat\n");
return (ret);
}
/*
* Calculate the kstat delta and work out the performance boost ratio
*/
for (cpu = 0; cpu < g_ncpus; cpu++) {
delta_mcnt = t_new[cpu].t_mcnt - cpu_turbo_info[cpu].t_mcnt;
delta_acnt = t_new[cpu].t_acnt - cpu_turbo_info[cpu].t_acnt;
if ((delta_mcnt > delta_acnt) || (delta_mcnt == 0))
ratio = 1.0;
else
ratio = (double)delta_acnt / (double)delta_mcnt;
g_turbo_ratio += ratio;
}
g_turbo_ratio = g_turbo_ratio / (double)g_ncpus;
/*
* Update the structure of the kstat for the next time calculation
*/
(void) memcpy(cpu_turbo_info, t_new, g_ncpus * (sizeof (turbo_info_t)));
return (0);
}
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