perf_event_uncore_attach.c

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/*
 * This file tests uncore events on perf_event kernels
 *
 * It uses the older PAPI_set_opt() way of specifying the CPU/granularity
 * rather than the new :cpu=0 method
 */

#include <stdio.h>

#include "papi.h"
#include "papi_test.h"

#include "do_loops.h"

#include "perf_event_uncore_lib.h"

int main( int argc, char **argv ) {

    int retval,quiet;
    int EventSet = PAPI_NULL;
    long long values[1];
    char *uncore_event=NULL;
    char event_name[BUFSIZ];
    int uncore_cidx=-1;
    const PAPI_component_info_t *info;

    /* Set TESTS_QUIET variable */
    quiet = tests_quiet( argc, argv );

    if (!quiet) {
        printf("Testing creating an uncore event using PAPI_set_opt() to specify CPU\n");
    }

    /* Init the PAPI library */
    retval = PAPI_library_init( PAPI_VER_CURRENT );
    if ( retval != PAPI_VER_CURRENT ) {
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    }

    /* Find the uncore PMU */
    uncore_cidx=PAPI_get_component_index("perf_event_uncore");
    if (uncore_cidx<0) {
        if (!quiet) {
            printf("perf_event_uncore component not found\n");
        }
        test_skip(__FILE__,__LINE__,"perf_event_uncore component not found",0);
    }

    /* Check if component disabled */
    info=PAPI_get_component_info(uncore_cidx);
    if (info->disabled) {
        if (!quiet) {
            printf("perf_event_uncore component is disabled\n");
        }
        test_skip(__FILE__,__LINE__,"uncore component disabled",0);
    }

    /* Get a relevant event name */
    uncore_event=get_uncore_event(event_name, BUFSIZ);
    if (uncore_event==NULL) {
        if (!quiet) {
            printf("uncore event name not available\n");
        }
        test_skip( __FILE__, __LINE__,
            "PAPI does not support uncore on this processor",
            PAPI_ENOSUPP );
    }

    /* Create an eventset */
    retval = PAPI_create_eventset(&EventSet);
    if (retval != PAPI_OK) {
        test_fail(__FILE__, __LINE__, "PAPI_create_eventset",retval);
    }

    /* Set a component for the EventSet */
    retval = PAPI_assign_eventset_component(EventSet, uncore_cidx);

    /* we need to set to a certain cpu for uncore to work */

    PAPI_cpu_option_t cpu_opt;

    cpu_opt.eventset=EventSet;
    cpu_opt.cpu_num=0;

    retval = PAPI_set_opt(PAPI_CPU_ATTACH,(PAPI_option_t*)&cpu_opt);
    if (retval != PAPI_OK) {
        if (!quiet) {
            printf("Could not cpu attach\n");
        }
        test_skip( __FILE__, __LINE__,
            "this test; trying to PAPI_CPU_ATTACH; need to run as root",
            retval);
    }

    /* we need to set the granularity to system-wide for uncore to work */

    PAPI_granularity_option_t gran_opt;

    gran_opt.def_cidx=0;
    gran_opt.eventset=EventSet;
    gran_opt.granularity=PAPI_GRN_SYS;

    retval = PAPI_set_opt(PAPI_GRANUL,(PAPI_option_t*)&gran_opt);
    if (retval != PAPI_OK) {
        test_skip( __FILE__, __LINE__,
            "this test; trying to set PAPI_GRN_SYS",
            retval);
    }

    /* we need to set domain to be as inclusive as possible */

    PAPI_domain_option_t domain_opt;

    domain_opt.def_cidx=0;
    domain_opt.eventset=EventSet;
    domain_opt.domain=PAPI_DOM_ALL;

    retval = PAPI_set_opt(PAPI_DOMAIN,(PAPI_option_t*)&domain_opt);
    if (retval != PAPI_OK) {
        if (!quiet) {
            printf("could not set PAPI_DOM_ALL\n");
        }
        test_skip( __FILE__, __LINE__,
            "this test; trying to set PAPI_DOM_ALL; need to run as root",
            retval);
    }

    /* Add our uncore event */
    retval = PAPI_add_named_event(EventSet, uncore_event);
    if (retval != PAPI_OK) {
        if ( !quiet ) {
            printf("Error trying to use event %s\n", uncore_event);
        }
        test_fail(__FILE__, __LINE__, "adding uncore event",retval);
    }

    /* Start PAPI */
    retval = PAPI_start( EventSet );
    if ( retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_start", retval );
    }

    /* our work code */
    do_flops( NUM_FLOPS );

    /* Stop PAPI */
    retval = PAPI_stop( EventSet, values );
    if ( retval != PAPI_OK ) {
        test_fail( __FILE__, __LINE__, "PAPI_stop", retval );
    }

    if ( !quiet ) {
        printf("\tUsing event %s\n",uncore_event);
        printf("\t%s: %lld\n",uncore_event,values[0]);
    }

    test_pass( __FILE__ );

    return 0;
}