perf_event_amd_northbridge.c

Go to the documentation of this file.

/*
 * This file tests uncore events on AMD fam15h Northbridge machines
 *  The Linux perf_event developers introduced fam15h Northbridge
 *   support in Linux 3.9 with an interfae similar to fam10h
 *   where the events were part of the core CPU
 *  They broke the ABI with Linux 3.10 and made fam15h NB a separate
 *   PMU, like the Intel uncore support.
 */
 
#include <stdio.h>
#include <string.h>
 
#include <sys/utsname.h>
 
#include "papi.h"
#include "papi_test.h"
 
#include "do_loops.h"
 
int main( int argc, char **argv ) {
 
    int retval;
    int EventSet = PAPI_NULL;
    long long values[1];
    char event_name[BUFSIZ];
    int uncore_cidx=-1;
    const PAPI_hw_info_t *hwinfo;
    int quiet;
    struct utsname uname_info;
 
    /* Set TESTS_QUIET variable */
    quiet = tests_quiet( argc, argv );
 
    uname(&uname_info);
    if (!quiet) printf("Found Linux %s\n",uname_info.release);
 
    /* Init the PAPI library */
    retval = PAPI_library_init( PAPI_VER_CURRENT );
    if ( retval != PAPI_VER_CURRENT ) {
        test_fail( __FILE__, __LINE__, "PAPI_library_init", retval );
    }
 
    /* Check for AMD machine */
    hwinfo = PAPI_get_hardware_info();
    if ( hwinfo == NULL ) {
        test_fail( __FILE__, __LINE__, "PAPI_get_hardware_info", 0 );
    }
 
    if (hwinfo->vendor != PAPI_VENDOR_AMD) {
        if (!quiet) printf("Test only for AMD machines\n");
        test_skip(__FILE__,__LINE__,"Test only for AMD processor",0);
    }
 
    if ( hwinfo->cpuid_family != 21) {
        if (!quiet) printf("Test only for fam15h AMD machines\n");
        test_skip(__FILE__,__LINE__,"Test only for fam15h AMD processor",0);
    }
 
    if (!strcmp(uname_info.release,"3.9")) {
 
        if (!quiet) printf("Detected 3.9 kernel, using perf_event\n");
 
        /* For kernel 3.9 use regular CPU component */
 
        /* Find the uncore PMU */
        uncore_cidx=PAPI_get_component_index("perf_event");
        if (uncore_cidx<0) {
            test_skip(__FILE__,__LINE__,"perf_event component not found",0);
        }
 
        /* Get a relevant event name */
        strncpy(event_name,"DRAM_ACCESSES:ALL", BUFSIZ);
    }
    else {
 
        /* 3.10 and later */
 
        if (!quiet) {
            printf("Detected > 3.9 kernel, using perf_event_uncore\n");
        }
 
        /* Find the uncore PMU */
        uncore_cidx=PAPI_get_component_index("perf_event_uncore");
        if (uncore_cidx<0) {
            test_skip(__FILE__,__LINE__,"perf_event_uncore component not found",0);
        }
 
        /* Get a relevant event name */
        /* This might change once libpfm4 gets new fam15h NB support */
        strncpy(event_name,"DRAM_ACCESSES:ALL", BUFSIZ);
    }
 
    /* 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) {
        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) {
        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, event_name);
    if (retval != PAPI_OK) {
        if ( !quiet ) {
            fprintf(stderr,"Error trying to use event %s\n", event_name);
        }
        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("AMD fam15h Northbridge test:\n");
        printf("Using event %s\n",event_name);
        printf("\t%s: %lld\n",event_name,values[0]);
    }
 
    test_pass( __FILE__ );
 
    return 0;
}