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#include <glib.h>
#include <cpuid.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <math.h>
#include "stdlib.h"
#include "string.h"
#include "zenmonitor.h"
#include "msr.h"
#define MSR_PWR_PRINTF_FORMAT " %8.3f W"
#define MESUREMENT_TIME 0.1
// AMD PPR = https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-0Fh.pdf
// AMD OSRR = https://developer.amd.com/wp-content/resources/56255_3_03.PDF
guint cores = 0;
guint threads_per_code = 0;
gdouble energy_unit = 0;
gint *msr_files = NULL;
gulong package_eng_b = 0;
gulong package_eng_a = 0;
gulong *core_eng_b = NULL;
gulong *core_eng_a = NULL;
gfloat package_power;
gfloat package_power_min;
gfloat package_power_max;
gfloat *core_power;
gfloat *core_power_min;
gfloat *core_power_max;
static guint get_core_count() {
guint eax = 0, ebx = 0, ecx = 0, edx = 0;
guint logical_cpus;
// AMD PPR: page 57 - CPUID_Fn00000001_EBX
__get_cpuid(1, &eax, &ebx, &ecx, &edx);
logical_cpus = (ebx >> 16) & 0xFF;
// AMD PPR: page 82 - CPUID_Fn8000001E_EBX
__get_cpuid(0x8000001E, &eax, &ebx, &ecx, &edx);
threads_per_code = ((ebx >> 8) & 0xF) + 1;
if (threads_per_code == 0)
return logical_cpus;
return logical_cpus / threads_per_code;
}
static gint open_msr(gshort core) {
gchar msr_path[20];
sprintf(msr_path, "/dev/cpu/%d/msr", core * threads_per_code);
return open(msr_path, O_RDONLY);
}
static gboolean read_msr(gint file, guint index, gulong *data) {
if (file < 0)
return FALSE;
return pread(file, data, sizeof *data, index) == sizeof *data;
}
gdouble get_energy_unit() {
gulong data;
// AMD OSRR: page 139 - MSRC001_0299
if (!read_msr(msr_files[0], 0xC0010299, &data))
return 0.0;
return pow(1.0/2.0, (double)((data >> 8) & 0x1F));
}
gulong get_package_energy() {
gulong data;
// AMD OSRR: page 139 - MSRC001_029B
if (!read_msr(msr_files[0], 0xC001029B, &data))
return 0;
return data;
}
gulong get_core_energy(gint core) {
gulong data;
// AMD OSRR: page 139 - MSRC001_029A
if (!read_msr(msr_files[core], 0xC001029A, &data))
return 0;
return data;
}
gboolean msr_init() {
int i;
size_t sz;
if (!check_zen())
return FALSE;
cores = get_core_count();
if (cores == 0)
return FALSE;
msr_files = malloc(cores * sizeof (gint));
for (i = 0; i < cores; i++) {
msr_files[i] = open_msr(i);
}
energy_unit = get_energy_unit();
if (energy_unit == 0)
return FALSE;
core_eng_b = malloc(cores * sizeof (gulong));
core_eng_a = malloc(cores * sizeof (gulong));
core_power = malloc(cores * sizeof (gfloat));
core_power_min = malloc(cores * sizeof (gfloat));
core_power_max = malloc(cores * sizeof (gfloat));
msr_update();
memcpy(core_power_min, core_power, cores * sizeof (gfloat));
memcpy(core_power_max, core_power, cores * sizeof (gfloat));
package_power_min = package_power;
package_power_max = package_power;
return TRUE;
}
void msr_update() {
GSList *list = NULL;
gint i;
package_eng_b = get_package_energy();
for (i = 0; i < cores; i++) {
core_eng_b[i] = get_core_energy(i);
}
usleep(MESUREMENT_TIME*1000000);
package_eng_a = get_package_energy();
for (i = 0; i < cores; i++) {
core_eng_a[i] = get_core_energy(i);
}
package_power = (package_eng_a - package_eng_b) * energy_unit / MESUREMENT_TIME;
if (package_power < package_power_min)
package_power_min = package_power;
if (package_power > package_power_max)
package_power_max = package_power;
for (i = 0; i < cores; i++) {
core_power[i] = (core_eng_a[i] - core_eng_b[i]) * energy_unit / MESUREMENT_TIME;
if (core_power[i] < core_power_min[i])
core_power_min[i] = core_power[i];
if (core_power[i] > core_power_max[i])
core_power_max[i] = core_power[i];
}
}
void msr_clear_minmax() {
gint i;
package_power_min = package_power;
package_power_max = package_power;
for (i = 0; i < cores; i++) {
core_power_min[i] = core_power[i];
}
}
GSList* msr_get_sensors() {
GSList *list = NULL;
SensorInit *data;
gint i;
data = sensor_init_new();
data->label = g_strdup("Package Power");
data->value = &package_power;
data->min = &package_power_min;
data->max = &package_power_max;
data->printf_format = MSR_PWR_PRINTF_FORMAT;
list = g_slist_append(list, data);
for (i = 0; i < cores; i++) {
data = sensor_init_new();
data->label = g_strdup_printf("Core %d Power", i);
data->value = &(core_power[i]);
data->min = &(core_power_min[i]);
data->max = &(core_power_max[i]);
data->printf_format = MSR_PWR_PRINTF_FORMAT;
list = g_slist_append(list, data);
}
return list;
}
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