linux-host_micpower.c

Go to the documentation of this file.

/* From intel examples, see $(mic_dir)/sysmgt/sdk/Examples/Usage */
#define MAX_DEVICES (32)
#define EVENTS_PER_DEVICE 10
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h> 

#include "MicAccessTypes.h"
#include "MicBasicTypes.h"
#include "MicAccessErrorTypes.h"
#include "MicAccessApi.h"
#include "MicPowerManagerAPI.h"

#include "papi.h"
#include "papi_internal.h"
#include "papi_vector.h"
#include "papi_memory.h"

void (*_dl_non_dynamic_init)(void) __attribute__((weak));

/* This is a guess, refine this later */
#define UPDATEFREQ 500000

papi_vector_t _host_micpower_vector;

typedef struct host_micpower_register {
    unsigned int selector;
} host_micpower_register_t;

typedef struct host_micpower_reg_alloc {
    host_micpower_register_t ra_bits;
} host_micpower_reg_alloc_t;

typedef struct host_micpower_native_event_entry {
    host_micpower_register_t resources; 
    char name[PAPI_MAX_STR_LEN];
    char description[PAPI_MAX_STR_LEN];
    char units[3];
} host_micpower_native_event_entry_t;

typedef struct host_micpower_control_state {
    int num_events;
    int resident[MAX_DEVICES*EVENTS_PER_DEVICE];
    long long counts[MAX_DEVICES*EVENTS_PER_DEVICE];
    long long lastupdate[MAX_DEVICES];
} host_micpower_control_state_t;

typedef struct host_micpower_context {
    host_micpower_control_state_t state;
} host_micpower_context_t; 

/* Global state info */
static MicDeviceOnSystem adapters[MAX_DEVICES];
static HANDLE handles[MAX_DEVICES];
static long long lastupdate[MAX_DEVICES];
static HANDLE accessHandle = NULL;
static U32 nAdapters = MAX_DEVICES;

static void* mic_access     =   NULL;
static void* scif_access    =   NULL;

#undef MICACCESS_API
#define MICACCESS_API __attribute__((weak))
const char *MicGetErrorString(U32);
U32 MICACCESS_API MicCloseAdapter(HANDLE);
U32 MICACCESS_API MicInitAPI(HANDLE *, ETarget, MicDeviceOnSystem *, U32 *);
U32 MICACCESS_API MicCloseAPI(HANDLE *);
U32 MICACCESS_API MicInitAdapter(HANDLE *, MicDeviceOnSystem *);
U32 MICACCESS_API MicGetPowerUsage(HANDLE, MicPwrUsage *);

const char *(*MicGetErrorStringPtr)(U32);
U32 (*MicCloseAdapterPtr)(HANDLE);
U32 (*MicInitAPIPtr)(HANDLE *, ETarget, MicDeviceOnSystem *, U32 *);
U32 (*MicCloseAPIPtr)(HANDLE *);
U32 (*MicInitAdapterPtr)(HANDLE *, MicDeviceOnSystem *);
U32 (*MicGetPowerUsagePtr)(HANDLE, MicPwrUsage *);
static host_micpower_native_event_entry_t *native_events_table = NULL;

struct powers {
        int total0;
        int total1;
        int inst;
        int imax;
        int pcie;
        int c2x3;
        int c2x4;
        int vccp;
        int vddg;
        int vddq;
};

typedef union {
        struct powers power;
        int array[EVENTS_PER_DEVICE]; 
} power_t;

static power_t cached_values[MAX_DEVICES];

static int 
loadFunctionPtrs()
{
    /* Attempt to guess if we were statically linked to libc, if so bail */
    if ( _dl_non_dynamic_init != NULL ) {
        strncpy(_host_micpower_vector.cmp_info.disabled_reason, "The host_micpower component does not support statically linking of libc.", PAPI_MAX_STR_LEN);
        return PAPI_ENOSUPP;
    }

      /* Need to link in the cuda libraries, if not found disable the component */
    scif_access = dlopen("libscif.so", RTLD_NOW | RTLD_GLOBAL);
    if (NULL == scif_access)
    {
        snprintf(_host_micpower_vector.cmp_info.disabled_reason, PAPI_MAX_STR_LEN, "Problem loading the SCIF library: %s\n", dlerror());
            _host_micpower_vector.cmp_info.disabled = 1;
        return ( PAPI_ENOSUPP );
    }

    mic_access = dlopen("libMicAccessSDK.so", RTLD_NOW | RTLD_GLOBAL);
    if (NULL == mic_access)
    {
        snprintf(_host_micpower_vector.cmp_info.disabled_reason, PAPI_MAX_STR_LEN, "Problem loading libMicAccessSDK.so: %s\n", dlerror());
            _host_micpower_vector.cmp_info.disabled = 1;
        return ( PAPI_ENOSUPP );
    }

    MicGetErrorStringPtr = dlsym(mic_access, "MicGetErrorString");
    if (dlerror() != NULL)
    {
            strncpy(_host_micpower_vector.cmp_info.disabled_reason, "MicAccessSDK function MicGetErrorString not found.",PAPI_MAX_STR_LEN);
            _host_micpower_vector.cmp_info.disabled = 1;
            return ( PAPI_ENOSUPP );
    }
    MicCloseAdapterPtr = dlsym(mic_access, "MicCloseAdapter");
    if (dlerror() != NULL)
    {
            strncpy(_host_micpower_vector.cmp_info.disabled_reason, "MicAccessSDK function MicCloseAdapter not found.",PAPI_MAX_STR_LEN);
            _host_micpower_vector.cmp_info.disabled = 1;
            return ( PAPI_ENOSUPP );
    }
    MicInitAPIPtr = dlsym(mic_access, "MicInitAPI");
    if (dlerror() != NULL)
    {
            strncpy(_host_micpower_vector.cmp_info.disabled_reason, "MicAccessSDK function MicInitAPI not found.",PAPI_MAX_STR_LEN);
            _host_micpower_vector.cmp_info.disabled = 1;
            return ( PAPI_ENOSUPP );
    }
    MicCloseAPIPtr = dlsym(mic_access, "MicCloseAPI");
    if (dlerror() != NULL)
    {
            strncpy(_host_micpower_vector.cmp_info.disabled_reason, "MicAccessSDK function MicCloseAPI not found.",PAPI_MAX_STR_LEN);
            _host_micpower_vector.cmp_info.disabled = 1;
            return ( PAPI_ENOSUPP );
    }
    MicInitAdapterPtr = dlsym(mic_access, "MicInitAdapter");
    if (dlerror() != NULL)
    {
            strncpy(_host_micpower_vector.cmp_info.disabled_reason, "MicAccessSDK function MicInitAdapter not found.",PAPI_MAX_STR_LEN);
            _host_micpower_vector.cmp_info.disabled = 1;
            return ( PAPI_ENOSUPP );
    }

    MicGetPowerUsagePtr = dlsym(mic_access, "MicGetPowerUsage");
    if (dlerror() != NULL)
    {
            strncpy(_host_micpower_vector.cmp_info.disabled_reason, "MicAccessSDK function MicGetPowerUsage not found.",PAPI_MAX_STR_LEN);
            _host_micpower_vector.cmp_info.disabled = 1;
            return ( PAPI_ENOSUPP );
    }

    return 0;
}


/* ###############################################
 *          Component Interface code 
 * ############################################### */


int 
_host_micpower_init_component( int cidx ) 
{
    U32 ret = MIC_ACCESS_API_ERROR_UNKNOWN;
    U32 adapterNum = 0;
    U32 throwaway = 1;

    _host_micpower_vector.cmp_info.CmpIdx = cidx;

    if ( loadFunctionPtrs() ) {
        goto disable_me;
    }

    memset( lastupdate, 0x0, sizeof(lastupdate));
    memset( cached_values, 0x0, sizeof(struct powers)*MAX_DEVICES );
    ret = MicInitAPIPtr( &accessHandle, eTARGET_SCIF_DRIVER, adapters, &nAdapters );
    if ( MIC_ACCESS_API_SUCCESS != ret ) {
        snprintf( _host_micpower_vector.cmp_info.disabled_reason, PAPI_MAX_STR_LEN, "Failed to init: %s", MicGetErrorStringPtr(ret));
        MicCloseAPIPtr(&accessHandle);
        goto disable_me;
    }
    /* Sanity check on array size */
    if ( nAdapters >= MAX_DEVICES ) {
        snprintf(_host_micpower_vector.cmp_info.disabled_reason, PAPI_MAX_STR_LEN, "Too many MIC cards [%d] found, bailing.", nAdapters);
        MicCloseAPIPtr(&accessHandle);
        goto disable_me;
    }

/* XXX: This code initializes a token for each adapter, in testing this appeared to be required/
 *  One has to call MicInitAdapter() before calling into that adapter's entries */
    for (adapterNum=0; adapterNum < nAdapters; adapterNum++) {
            ret = MicInitAPIPtr( &handles[adapterNum], eTARGET_SCIF_DRIVER, adapters, &throwaway );
            throwaway = 1;
            if (MIC_ACCESS_API_SUCCESS != ret) {
                    fprintf(stderr, "%d:MicInitAPI carps: %s\n", __LINE__, MicGetErrorStringPtr(ret));
                    nAdapters = adapterNum;
                    for (adapterNum=0; adapterNum < nAdapters; adapterNum++)
                            MicCloseAdapterPtr( handles[adapterNum] );
                    MicCloseAPIPtr( &accessHandle );
                    snprintf(_host_micpower_vector.cmp_info.disabled_reason, PAPI_MAX_STR_LEN,
                        "Failed to initialize card %d's interface.", nAdapters);
                    goto disable_me;
            }
            ret = MicInitAdapterPtr(&handles[adapterNum], &adapters[adapterNum]);
            if (MIC_ACCESS_API_SUCCESS != ret) {
                    fprintf(stderr, "%d:MicInitAdapter carps: %s\n", __LINE__, MicGetErrorStringPtr(ret));
                    nAdapters = adapterNum;
                    for (adapterNum=0; adapterNum < nAdapters; adapterNum++)
                            MicCloseAdapterPtr( handles[adapterNum] );
                    MicCloseAPIPtr( &accessHandle );
                    snprintf(_host_micpower_vector.cmp_info.disabled_reason, PAPI_MAX_STR_LEN,
                        "Failed to initialize card %d's interface.", nAdapters);
                    goto disable_me;
            }
    }

    native_events_table = ( host_micpower_native_event_entry_t*)papi_malloc( nAdapters * EVENTS_PER_DEVICE * sizeof(host_micpower_native_event_entry_t));
    if ( NULL == native_events_table ) {
        return PAPI_ENOMEM;
    }
    for (adapterNum=0; adapterNum < nAdapters; adapterNum++) {
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE].name, PAPI_MAX_STR_LEN, "mic%d:tot0", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE].description, PAPI_MAX_STR_LEN, "Total power utilization, Averaged over Time Window 0 (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE].resources.selector = adapterNum*EVENTS_PER_DEVICE + 1;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 1].name, PAPI_MAX_STR_LEN, "mic%d:tot1", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 1].description, PAPI_MAX_STR_LEN, "Total power utilization, Averaged over Time Window 1 (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 1].resources.selector = adapterNum*EVENTS_PER_DEVICE + 2;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 1].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 2].name, PAPI_MAX_STR_LEN, "mic%d:pcie", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 2].description, PAPI_MAX_STR_LEN, "PCI-E connector power (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 2].resources.selector = adapterNum*EVENTS_PER_DEVICE + 3;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 2].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 3].name, PAPI_MAX_STR_LEN, "mic%d:inst", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 3].description, PAPI_MAX_STR_LEN, "Instantaneous power (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 3].resources.selector = adapterNum*EVENTS_PER_DEVICE + 4;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 3].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 4].name, PAPI_MAX_STR_LEN, "mic%d:imax", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 4].description, PAPI_MAX_STR_LEN, "Max instantaneous power (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 4].resources.selector = adapterNum*EVENTS_PER_DEVICE + 5;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 4].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 5].name, PAPI_MAX_STR_LEN, "mic%d:c2x3", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 5].description, PAPI_MAX_STR_LEN, "2x3 connector power (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 5].resources.selector = adapterNum*EVENTS_PER_DEVICE + 6;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 5].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 6].name, PAPI_MAX_STR_LEN, "mic%d:c2x4", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 6].description, PAPI_MAX_STR_LEN, "2x4 connector power (uWatts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 6].resources.selector = adapterNum*EVENTS_PER_DEVICE + 7;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 6].units, PAPI_MIN_STR_LEN, "uW");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 7].name, PAPI_MAX_STR_LEN, "mic%d:vccp", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 7].description, PAPI_MAX_STR_LEN, "Core rail (uVolts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 7].resources.selector = adapterNum*EVENTS_PER_DEVICE + 8;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 7].units, PAPI_MIN_STR_LEN, "uV");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 8].name, PAPI_MAX_STR_LEN, "mic%d:vddg", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 8].description, PAPI_MAX_STR_LEN, "Uncore rail (uVolts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 8].resources.selector = adapterNum*EVENTS_PER_DEVICE + 9;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 8].units, PAPI_MIN_STR_LEN, "uV");

        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 9].name, PAPI_MAX_STR_LEN, "mic%d:vddq", adapterNum);
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 9].description, PAPI_MAX_STR_LEN, "Memory subsystem rail (uVolts)");
        native_events_table[adapterNum*EVENTS_PER_DEVICE + 9].resources.selector = adapterNum*EVENTS_PER_DEVICE + 10;
        snprintf(native_events_table[adapterNum*EVENTS_PER_DEVICE + 9].units, PAPI_MIN_STR_LEN, "uV");
    }

    _host_micpower_vector.cmp_info.num_cntrs = EVENTS_PER_DEVICE*nAdapters;
    _host_micpower_vector.cmp_info.num_mpx_cntrs = EVENTS_PER_DEVICE*nAdapters;

    _host_micpower_vector.cmp_info.num_native_events = EVENTS_PER_DEVICE*nAdapters;

    return PAPI_OK;

disable_me:
    _host_micpower_vector.cmp_info.num_cntrs = 0;
    _host_micpower_vector.cmp_info.num_mpx_cntrs = 0;
    _host_micpower_vector.cmp_info.num_native_events = 0;
    _host_micpower_vector.cmp_info.disabled = 1;

    nAdapters = 0;
    return PAPI_ENOSUPP;
}

int _host_micpower_init_thread( hwd_context_t *ctx) {
    (void)ctx;
    return PAPI_OK;
}

int
_host_micpower_shutdown_component( void ) {
    U32 i = 0;
    for( i=0; i<nAdapters; i++) {
        MicCloseAdapterPtr( handles[i] );
    }

    papi_free(native_events_table);
    return PAPI_OK;
}
    
int
_host_micpower_shutdown_thread( hwd_context_t *ctx ) {
    (void) ctx;
    return PAPI_OK;
}

int _host_micpower_init_control_state ( hwd_control_state_t *ctl ) {
    host_micpower_control_state_t *state = (host_micpower_control_state_t*) ctl;
    memset( state, 0, sizeof(host_micpower_control_state_t));

    return PAPI_OK;
}

int _host_micpower_update_control_state(hwd_control_state_t *ctl, 
                                        NativeInfo_t *info, 
                                        int count,
                                        hwd_context_t* ctx ) {

    (void) ctx;
    int i, index;
    
    host_micpower_control_state_t *state = (host_micpower_control_state_t*)ctl;

    for (i=0; i<MAX_DEVICES*EVENTS_PER_DEVICE; i++)
        state->resident[i] = 0;

    for (i=0; i < count; i++) {
        index = info[i].ni_event&PAPI_NATIVE_AND_MASK;
        info[i].ni_position=native_events_table[index].resources.selector-1;
        state->resident[index] = 1;
    }
    state->num_events = count;

    return PAPI_OK;
}

int
_host_micpower_start( hwd_context_t *ctx, hwd_control_state_t *ctl )
{
    (void) ctx;
    (void) ctl;
    return PAPI_OK;
}

static int 
read_power( struct powers *pwr, int which_one ) 
{
    MicPwrUsage power;
    U32 ret = MIC_ACCESS_API_ERROR_UNKNOWN;

    if ( which_one < 0 || which_one > (int)nAdapters )
        return PAPI_ENOEVNT;
    

    ret = MicGetPowerUsagePtr(handles[which_one], &power);
    if (MIC_ACCESS_API_SUCCESS != ret) {
            fprintf(stderr,"Oops MicGetPowerUsage failed: %s\n", 
                            MicGetErrorStringPtr(ret));
            return PAPI_ECMP;
    }

    pwr->total0 = power.total0.prr;
    pwr->total1 = power.total1.prr;
    pwr->inst = power.inst.prr;
    pwr->imax = power.imax.prr;
    pwr->pcie = power.pcie.prr;
    pwr->c2x3 = power.c2x3.prr;
    pwr->c2x4 = power.c2x4.prr;
    pwr->vccp = power.vccp.pwr;
    pwr->vddg = power.vddg.pwr;
    pwr->vddq = power.vddq.pwr;

    return PAPI_OK;
}

int
_host_micpower_read( hwd_context_t *ctx, hwd_control_state_t *ctl, 
                     long long **events, int flags) 
{
    (void)flags;
    (void)events;
    (void)ctx;
    unsigned int i,j;
    int needs_update = 0;
    host_micpower_control_state_t* control = (host_micpower_control_state_t*)ctl;
    long long now = PAPI_get_real_usec();

    for( i=0; i<nAdapters; i++) {
            needs_update = 0;
            for (j=0; j<EVENTS_PER_DEVICE; j++) {
                if ( control->resident[EVENTS_PER_DEVICE*i+j]) {
                        needs_update = 1;
                        break;
                }
            }

            if ( needs_update ) {
                    /* Do the global update */
                    if ( now >= lastupdate[i] + UPDATEFREQ) {
                            read_power( &cached_values[i].power, i );
                            lastupdate[i] = now;
                    }
                    /* update from cached values */
                    if ( control->lastupdate[i] < lastupdate[i]) {
                            control->lastupdate[i] = lastupdate[i];
                    }
                    for (j=0; j<EVENTS_PER_DEVICE; j++) {
                        if ( control->resident[EVENTS_PER_DEVICE*i+j] ) {
                            control->counts[EVENTS_PER_DEVICE*i+j] = (long long)cached_values[i].array[j];
                        }
                    }
            }
    }

    *events = control->counts;
    return PAPI_OK;
}

int
_host_micpower_stop( hwd_context_t *ctx, hwd_control_state_t *ctl )
{
    (void)ctx;
    int needs_update = 0;
    unsigned int i,j;
    host_micpower_control_state_t* control = (host_micpower_control_state_t*)ctl;
    long long now = PAPI_get_real_usec();

    for( i=0; i<nAdapters; i++) {
            needs_update = 0;
            for (j=0; j<EVENTS_PER_DEVICE; j++) {
                if ( control->resident[EVENTS_PER_DEVICE*i+j]) {
                        needs_update = 1;
                        break;
                }
            }

            if ( needs_update ) {
                    /* Do the global update */
                    if ( now >= lastupdate[i] + UPDATEFREQ) {
                            read_power( &cached_values[i].power, i );
                            lastupdate[i] = now;
                    }
                    /* update from cached values */
                    if ( control->lastupdate[i] < lastupdate[i]) {
                            control->lastupdate[i] = lastupdate[i];
                    }
                    for (j=0; j<EVENTS_PER_DEVICE; j++) {
                        if ( control->resident[EVENTS_PER_DEVICE*i+j] ) {
                            control->counts[EVENTS_PER_DEVICE*i+j] = (long long)cached_values[i].array[j];
                        }
                    }
            }
    }
    return PAPI_OK;

}

int _host_micpower_ntv_enum_events( unsigned int *EventCode, int modifier )
{
    int index;
    switch (modifier) {
        case PAPI_ENUM_FIRST:
            if (0 == _host_micpower_vector.cmp_info.num_cntrs)
                return PAPI_ENOEVNT;
            *EventCode = 0;
            return PAPI_OK;
        case PAPI_ENUM_EVENTS:
            index = *EventCode;
            if ( index < _host_micpower_vector.cmp_info.num_cntrs - 1) {
                *EventCode = *EventCode + 1;
                return PAPI_OK;
            } else {
                return PAPI_ENOEVNT;
            }
            break;
        default:
            return PAPI_EINVAL;
    }
    return PAPI_EINVAL;
}

int
_host_micpower_ntv_code_to_name( unsigned int EventCode, char *name, int len )
{
    unsigned int code = EventCode & PAPI_NATIVE_AND_MASK;
    if ( code < _host_micpower_vector.cmp_info.num_cntrs ) {
        strncpy( name, native_events_table[code].name, len);
        return PAPI_OK;
    }

    return PAPI_ENOEVNT;
}

int
_host_micpower_ntv_code_to_descr( unsigned int EventCode, char *name, int len )
{
    unsigned int code = EventCode & PAPI_NATIVE_AND_MASK;
    if ( code < _host_micpower_vector.cmp_info.num_cntrs ) {
        strncpy( name, native_events_table[code].description, len );
        return PAPI_OK;
    }

    return PAPI_ENOEVNT;
}

int
_host_micpower_ntv_code_to_info( unsigned int EventCode, PAPI_event_info_t *info)
{
    unsigned int code = EventCode & PAPI_NATIVE_AND_MASK;
    if ( code >= _host_micpower_vector.cmp_info.num_cntrs)
        return PAPI_ENOEVNT;
    strncpy( info->symbol, native_events_table[code].name, sizeof(info->symbol) );
    strncpy( info->long_descr, native_events_table[code].description, sizeof(info->long_descr) );
    strncpy( info->units, native_events_table[code].units, sizeof(info->units) );
    return PAPI_OK;
}

int
_host_micpower_ctl( hwd_context_t* ctx, int code, _papi_int_option_t *option)
{
    (void)ctx;
    (void)code;
    (void)option;
    return PAPI_OK;
}

int
_host_micpower_set_domain( hwd_control_state_t* ctl, int domain)
{
    (void)ctl;
    (void)domain;
    return PAPI_OK;
}

papi_vector_t _host_micpower_vector = {
    .cmp_info = {
        .name = "host_micpower", 
        .short_name = "host_micpower", 
        .description = "A host-side component to read power usage on MIC guest cards.",
        .version = "0.1",
        .support_version = "n/a",
        .kernel_version = "n/a",
        .num_cntrs = 0,
        .num_mpx_cntrs = 0,
        .default_domain             = PAPI_DOM_ALL,
        .available_domains          = PAPI_DOM_ALL,
        .default_granularity        = PAPI_GRN_THR,
        .available_granularities    = PAPI_GRN_THR,
        .hardware_intr_sig          = PAPI_INT_SIGNAL,
    }, 

    .size  = {
        .context        = sizeof(host_micpower_context_t), 
        .control_state  = sizeof(host_micpower_control_state_t),
        .reg_value      = sizeof(host_micpower_register_t),
        .reg_alloc      = sizeof(host_micpower_reg_alloc_t),
    },

    .start                  = _host_micpower_start,
    .stop                   = _host_micpower_start,
    .read                   = _host_micpower_read, 
    .reset                  = NULL,
    .write                  = NULL,
    .init_component         = _host_micpower_init_component,
    .init_thread            = _host_micpower_init_thread,
    .init_control_state     = _host_micpower_init_control_state,
    .update_control_state   = _host_micpower_update_control_state,
    .ctl                    = _host_micpower_ctl, 
    .shutdown_thread        = _host_micpower_shutdown_thread,
    .shutdown_component     = _host_micpower_shutdown_component,
    .set_domain             = _host_micpower_set_domain,

    .ntv_enum_events        = _host_micpower_ntv_enum_events, 
    .ntv_code_to_name       = _host_micpower_ntv_code_to_name,
    .ntv_code_to_descr      = _host_micpower_ntv_code_to_descr,
    .ntv_code_to_info       = _host_micpower_ntv_code_to_info,

};