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/*
* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Based on Len Brown's <lenb@kernel.org> turbostat tool.
*/
#if defined(__i386__) || defined(__x86_64__)
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "helpers/helpers.h"
#include "idle_monitor/cpupower-monitor.h"
#define MSR_PKG_C2_RESIDENCY 0x60D
#define MSR_PKG_C7_RESIDENCY 0x3FA
#define MSR_CORE_C7_RESIDENCY 0x3FE
#define MSR_TSC 0x10
enum intel_snb_id { C7 = 0, PC2, PC7, SNB_CSTATE_COUNT, TSC = 0xFFFF };
static int snb_get_count_percent(unsigned int self_id, double *percent,
unsigned int cpu);
static cstate_t snb_cstates[SNB_CSTATE_COUNT] = {
{
.name = "C7",
.desc = N_("Processor Core C7"),
.id = C7,
.range = RANGE_CORE,
.get_count_percent = snb_get_count_percent,
},
{
.name = "PC2",
.desc = N_("Processor Package C2"),
.id = PC2,
.range = RANGE_PACKAGE,
.get_count_percent = snb_get_count_percent,
},
{
.name = "PC7",
.desc = N_("Processor Package C7"),
.id = PC7,
.range = RANGE_PACKAGE,
.get_count_percent = snb_get_count_percent,
},
};
static unsigned long long tsc_at_measure_start;
static unsigned long long tsc_at_measure_end;
static unsigned long long *previous_count[SNB_CSTATE_COUNT];
static unsigned long long *current_count[SNB_CSTATE_COUNT];
/* valid flag for all CPUs. If a MSR read failed it will be zero */
static int *is_valid;
static int snb_get_count(enum intel_snb_id id, unsigned long long *val,
unsigned int cpu)
{
int msr;
switch (id) {
case C7:
msr = MSR_CORE_C7_RESIDENCY;
break;
case PC2:
msr = MSR_PKG_C2_RESIDENCY;
break;
case PC7:
msr = MSR_PKG_C7_RESIDENCY;
break;
case TSC:
msr = MSR_TSC;
break;
default:
return -1;
};
if (read_msr(cpu, msr, val))
return -1;
return 0;
}
static int snb_get_count_percent(unsigned int id, double *percent,
unsigned int cpu)
{
*percent = 0.0;
if (!is_valid[cpu])
return -1;
*percent = (100.0 *
(current_count[id][cpu] - previous_count[id][cpu])) /
(tsc_at_measure_end - tsc_at_measure_start);
dprint("%s: previous: %llu - current: %llu - (%u)\n",
snb_cstates[id].name, previous_count[id][cpu],
current_count[id][cpu], cpu);
dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n",
snb_cstates[id].name,
(unsigned long long) tsc_at_measure_end - tsc_at_measure_start,
current_count[id][cpu] - previous_count[id][cpu],
*percent, cpu);
return 0;
}
static int snb_start(void)
{
int num, cpu;
unsigned long long val;
for (num = 0; num < SNB_CSTATE_COUNT; num++) {
for (cpu = 0; cpu < cpu_count; cpu++) {
snb_get_count(num, &val, cpu);
previous_count[num][cpu] = val;
}
}
snb_get_count(TSC, &tsc_at_measure_start, 0);
return 0;
}
static int snb_stop(void)
{
unsigned long long val;
int num, cpu;
snb_get_count(TSC, &tsc_at_measure_end, 0);
for (num = 0; num < SNB_CSTATE_COUNT; num++) {
for (cpu = 0; cpu < cpu_count; cpu++) {
is_valid[cpu] = !snb_get_count(num, &val, cpu);
current_count[num][cpu] = val;
}
}
return 0;
}
struct cpuidle_monitor intel_snb_monitor;
static struct cpuidle_monitor *snb_register(void)
{
int num;
if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL
|| cpupower_cpu_info.family != 6)
return NULL;
if (cpupower_cpu_info.model != 0x2A
&& cpupower_cpu_info.model != 0x2D)
return NULL;
is_valid = calloc(cpu_count, sizeof(int));
for (num = 0; num < SNB_CSTATE_COUNT; num++) {
previous_count[num] = calloc(cpu_count,
sizeof(unsigned long long));
current_count[num] = calloc(cpu_count,
sizeof(unsigned long long));
}
intel_snb_monitor.name_len = strlen(intel_snb_monitor.name);
return &intel_snb_monitor;
}
void snb_unregister(void)
{
int num;
free(is_valid);
for (num = 0; num < SNB_CSTATE_COUNT; num++) {
free(previous_count[num]);
free(current_count[num]);
}
}
struct cpuidle_monitor intel_snb_monitor = {
.name = "SandyBridge",
.hw_states = snb_cstates,
.hw_states_num = SNB_CSTATE_COUNT,
.start = snb_start,
.stop = snb_stop,
.do_register = snb_register,
.unregister = snb_unregister,
.needs_root = 1,
.overflow_s = 922000000 /* 922337203 seconds TSC overflow
at 20GHz */
};
#endif /* defined(__i386__) || defined(__x86_64__) */
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