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 "papi_test.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;
   char kernel[]="3.9";

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

   /* 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) {
      test_skip(__FILE__,__LINE__,"Test only for AMD processor",0);
   }

   if ( hwinfo->cpuid_family != 21) {
      test_skip(__FILE__,__LINE__,"Test only for fam15h AMD processor",0);
   }

   if (!strcmp(kernel,"3.9")) {

      /* 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 */

      /* 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 chanve 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 ( !TESTS_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 ( !TESTS_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__, NULL, 0 );

   return 0;
}