linux-L2unit.c

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/****************************/
/* THIS IS OPEN SOURCE CODE */
/****************************/

#include "linux-L2unit.h"

/* Declare our vector in advance */
papi_vector_t _L2unit_vector;

/* prototypes */
void user_signal_handler_L2UNIT( int hEvtSet, uint64_t address, uint64_t ovfVector, const ucontext_t *pContext );

/*****************************************************************************
 *******************  BEGIN PAPI's COMPONENT REQUIRED FUNCTIONS  *************
 *****************************************************************************/

/*
 * This is called whenever a thread is initialized
 */
int
L2UNIT_init_thread( hwd_context_t * ctx )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_init_thread\n" );
#endif
    
    ( void ) ctx;
    return PAPI_OK;
}


/* Initialize hardware counters, setup the function vector table
 * and get hardware information, this routine is called when the 
 * PAPI process is initialized (IE PAPI_library_init)
 */
int
L2UNIT_init_component( int cidx )
{ 
#ifdef DEBUG_BGQ
    printf( "L2UNIT_init_component\n" );
#endif
    
    _L2unit_vector.cmp_info.CmpIdx = cidx;
#ifdef DEBUG_BGQ
    printf( "L2UNIT_init_component cidx = %d\n", cidx );
#endif
    
    return ( PAPI_OK );
}


/*
 * Control of counters (Reading/Writing/Starting/Stopping/Setup)
 * functions
 */
int
L2UNIT_init_control_state( hwd_control_state_t * ptr )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_init_control_state\n" );
#endif

    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ptr;
    
    this_state->EventGroup = Bgpm_CreateEventSet();
    CHECK_BGPM_ERROR( this_state->EventGroup, "Bgpm_CreateEventSet" );

    // initialize overflow flag to OFF (0)
    this_state->overflow = 0;
    this_state->overflow_threshold = 0;
    this_state->overflow_EventIndex = 0;    
    // initialized BGPM eventGroup flag to NOT applied yet (0)
    this_state->bgpm_eventset_applied = 0;

    return PAPI_OK;
}


/*
 *
 */
int
L2UNIT_start( hwd_context_t * ctx, hwd_control_state_t * ptr )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_start\n" );
#endif
    ( void ) ctx;
    int retval;
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ptr;
    
    retval = Bgpm_Apply( this_state->EventGroup ); 
    CHECK_BGPM_ERROR( retval, "Bgpm_Apply" );

    // set flag to 1: BGPM eventGroup HAS BEEN applied
    this_state->bgpm_eventset_applied = 1;

    /* Bgpm_Apply() does an implicit reset; 
     hence no need to use Bgpm_ResetStart */
    retval = Bgpm_Start( this_state->EventGroup );
    CHECK_BGPM_ERROR( retval, "Bgpm_Start" );
    
    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_stop( hwd_context_t * ctx, hwd_control_state_t * ptr )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_stop\n" );
#endif
    ( void ) ctx;
    int retval;
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ptr;
    
    retval = Bgpm_Stop( this_state->EventGroup );
    CHECK_BGPM_ERROR( retval, "Bgpm_Stop" );
    
    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_read( hwd_context_t * ctx, hwd_control_state_t * ptr,
           long_long ** events, int flags )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_read\n" );
#endif
    ( void ) ctx;
    ( void ) flags;
    int i, numEvts;
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ptr;
    
    numEvts = Bgpm_NumEvents( this_state->EventGroup );
    if ( numEvts == 0 ) {
#ifdef DEBUG_BGPM
        printf ("Error: ret value is %d for BGPM API function Bgpm_NumEvents.\n", numEvts );
#endif
        //return ( EXIT_FAILURE );
    }

    for ( i = 0; i < numEvts; i++ )
        this_state->counters[i] = _common_getEventValue( i, this_state->EventGroup );
    
    *events = this_state->counters;
    
    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_shutdown_thread( hwd_context_t * ctx )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_shutdown_thread\n" );
#endif
    
    ( void ) ctx;
    return ( PAPI_OK );
}




/*
 * user_signal_handler
 *
 * This function is used when hardware overflows are working or when
 * software overflows are forced
 */
void
user_signal_handler_L2UNIT( int hEvtSet, uint64_t address, uint64_t ovfVector, const ucontext_t *pContext )
{
#ifdef DEBUG_BGQ
    printf( "user_signal_handler_L2UNIT\n" );
#endif
    ( void ) address;
    int retval;
    unsigned i;
    int isHardware = 1;
    int cidx = _L2unit_vector.cmp_info.CmpIdx;
    long_long overflow_bit = 0;
    caddr_t address1;
    _papi_hwi_context_t ctx;
    ctx.ucontext = ( hwd_ucontext_t * ) pContext;
    ThreadInfo_t *thread = _papi_hwi_lookup_thread( 0 );
    EventSetInfo_t *ESI;
    ESI = thread->running_eventset[cidx];
    // Get the indices of all events which have overflowed.
    unsigned ovfIdxs[BGPM_MAX_OVERFLOW_EVENTS];
    unsigned len = BGPM_MAX_OVERFLOW_EVENTS;
    
    retval = Bgpm_GetOverflowEventIndices( hEvtSet, ovfVector, ovfIdxs, &len );
    if ( retval < 0 ) {
#ifdef DEBUG_BGPM
        printf ( "Error: ret value is %d for BGPM API function Bgpm_GetOverflowEventIndices.\n",
                 retval );
#endif
        return;
    }
    
    if ( thread == NULL ) {
        PAPIERROR( "thread == NULL in user_signal_handler!" );
        return;
    }
    
    if ( ESI == NULL ) {
        PAPIERROR( "ESI == NULL in user_signal_handler!");
        return;
    }
    
    if ( ESI->overflow.flags == 0 ) {
        PAPIERROR( "ESI->overflow.flags == 0 in user_signal_handler!");
        return;
    }
    
    for ( i = 0; i < len; i++ ) {
        uint64_t hProf;
        Bgpm_GetEventUser1( hEvtSet, ovfIdxs[i], &hProf );
        if ( hProf ) {
            overflow_bit ^= 1 << ovfIdxs[i];
            break;
        }
        
    }
    
    if ( ESI->overflow.flags & PAPI_OVERFLOW_FORCE_SW ) {
#ifdef DEBUG_BGQ
        printf("OVERFLOW_SOFTWARE\n");
#endif
        address1 = GET_OVERFLOW_ADDRESS( ctx );
        _papi_hwi_dispatch_overflow_signal( ( void * ) &ctx, address1, NULL, 0, 0, &thread, cidx );
        return;
    }
    else if ( ESI->overflow.flags & PAPI_OVERFLOW_HARDWARE ) {
#ifdef DEBUG_BGQ
        printf("OVERFLOW_HARDWARE\n");
#endif
        address1 = GET_OVERFLOW_ADDRESS( ctx );
        _papi_hwi_dispatch_overflow_signal( ( void * ) &ctx, address1, &isHardware, overflow_bit, 0, &thread, cidx );
    }
    else {
#ifdef DEBUG_BGQ
        printf("OVERFLOW_NONE\n");
#endif
        PAPIERROR( "ESI->overflow.flags is set to something other than PAPI_OVERFLOW_HARDWARE or PAPI_OVERFLOW_FORCE_SW (%x)", thread->running_eventset[cidx]->overflow.flags);
    }
}


/*
 * Set Overflow
 *
 * This is commented out in BG/L/P - need to explore and complete...
 * However, with true 64-bit counters in BG/Q and all counters for PAPI
 * always starting from a true zero (we don't allow write...), the possibility
 * for overflow is remote at best...
 */
int
L2UNIT_set_overflow( EventSetInfo_t * ESI, int EventIndex, int threshold )
{
#ifdef DEBUG_BGQ
    printf("BEGIN L2UNIT_set_overflow\n");
#endif
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ESI->ctl_state;
    int retval;
    int evt_idx;
    
    /*
     * In case an BGPM eventGroup HAS BEEN applied or attached before
     * overflow is set, delete the eventGroup and create an new empty one,
     * and rebuild as it was prior to deletion
     */
#ifdef DEBUG_BGQ
    printf( "L2UNIT_set_overflow: bgpm_eventset_applied = %d\n",
           this_state->bgpm_eventset_applied );
#endif  
    if ( 1 == this_state->bgpm_eventset_applied ) {
        _common_deleteRecreate( &this_state->EventGroup );
        _common_rebuildEventgroup( this_state->count,
                                  this_state->EventGroup_local,
                                  &this_state->EventGroup );
        
        /* set BGPM eventGroup flag back to NOT applied yet (0) 
         * because the eventGroup has been recreated from scratch */
        this_state->bgpm_eventset_applied = 0;
    }
        
    evt_idx = ESI->EventInfoArray[EventIndex].pos[0];
    SUBDBG( "Hardware counter %d (vs %d) used in overflow, threshold %d\n",
           evt_idx, EventIndex, threshold );
#ifdef DEBUG_BGQ
    printf( "Hardware counter %d (vs %d) used in overflow, threshold %d\n",
           evt_idx, EventIndex, threshold );
#endif
    /* If this counter isn't set to overflow, it's an error */
    if ( threshold == 0 ) {
        /* Remove the signal handler */
        retval = _papi_hwi_stop_signal( _L2unit_vector.cmp_info.hardware_intr_sig );
        if ( retval != PAPI_OK )
            return ( retval );
    }
    else {
        this_state->overflow = 1;
        this_state->overflow_threshold = threshold;
        this_state->overflow_EventIndex = evt_idx;
        
#ifdef DEBUG_BGQ
        printf( "L2UNIT_set_overflow: Enable the signal handler\n" );
#endif
        /* Enable the signal handler */
        retval = _papi_hwi_start_signal( _L2unit_vector.cmp_info.hardware_intr_sig, 
                                        NEED_CONTEXT, 
                                        _L2unit_vector.cmp_info.CmpIdx );
        if ( retval != PAPI_OK )
            return ( retval );

        _common_set_overflow_BGPM( this_state->EventGroup, 
                                  this_state->overflow_EventIndex, 
                                  this_state->overflow_threshold,
                                  user_signal_handler_L2UNIT );
    }
    
    return ( PAPI_OK );
}



/* This function sets various options in the component
 * The valid codes being passed in are PAPI_SET_DEFDOM,
 * PAPI_SET_DOMAIN, PAPI_SETDEFGRN, PAPI_SET_GRANUL * and PAPI_SET_INHERIT
 */
int
L2UNIT_ctl( hwd_context_t * ctx, int code, _papi_int_option_t * option )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_ctl\n" );
#endif
    
    ( void ) ctx;
    ( void ) code;
    ( void ) option;
    return ( PAPI_OK );
}


/*
 * PAPI Cleanup Eventset
 * Destroy and re-create the BGPM / L2unit EventSet
 */
int
L2UNIT_cleanup_eventset( hwd_control_state_t * ctrl )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_cleanup_eventset\n" );
#endif
    
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ctrl;
    
    // create a new empty bgpm eventset
    // reason: bgpm doesn't permit to remove events from an eventset; 
    // hence we delete the old eventset and create a new one
    _common_deleteRecreate( &this_state->EventGroup ); 

    // set overflow flag to OFF (0)
    this_state->overflow = 0;
    this_state->overflow_threshold = 0;
    this_state->overflow_EventIndex = 0;    
    // set BGPM eventGroup flag back to NOT applied yet (0)
    this_state->bgpm_eventset_applied = 0;
    
    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_update_control_state( hwd_control_state_t * ptr,
                           NativeInfo_t * native, int count,
                           hwd_context_t * ctx )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_update_control_state: count = %d\n", count );
#endif  
    
    ( void ) ctx;
    int retval, index, i;
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ptr;
    
    // Delete and re-create BGPM eventset
    _common_deleteRecreate( &this_state->EventGroup );

#ifdef DEBUG_BGQ
    printf( "L2UNIT_update_control_state: EventGroup=%d, overflow = %d\n",
           this_state->EventGroup, this_state->overflow );
#endif
    
    
    // otherwise, add the events to the eventset
    for ( i = 0; i < count; i++ ) {
        index = ( native[i].ni_event ) + OFFSET;
        
        native[i].ni_position = i;
        
#ifdef DEBUG_BGQ
        printf("L2UNIT_update_control_state: ADD event: i = %d, index = %d\n", i, index );
#endif
        
        this_state->EventGroup_local[i] = index;

        
        /* Add events to the BGPM eventGroup */
        retval = Bgpm_AddEvent( this_state->EventGroup, index );
        CHECK_BGPM_ERROR( retval, "Bgpm_AddEvent" );
    }
    
    // store how many events we added to an EventSet
    this_state->count = count;

    // since update_control_state trashes overflow settings, this puts things
    // back into balance for BGPM 
    if ( 1 == this_state->overflow ) {
        _common_set_overflow_BGPM( this_state->EventGroup, 
                                  this_state->overflow_EventIndex, 
                                  this_state->overflow_threshold,
                                  user_signal_handler_L2UNIT );
    }
    
    return ( PAPI_OK );
}


/*
 * This function has to set the bits needed to count different domains
 * In particular: PAPI_DOM_USER, PAPI_DOM_KERNEL PAPI_DOM_OTHER
 * By default return PAPI_EINVAL if none of those are specified
 * and PAPI_OK with success
 * PAPI_DOM_USER is only user context is counted
 * PAPI_DOM_KERNEL is only the Kernel/OS context is counted
 * PAPI_DOM_OTHER  is Exception/transient mode (like user TLB misses)
 * PAPI_DOM_ALL   is all of the domains
 */
int
L2UNIT_set_domain( hwd_control_state_t * cntrl, int domain )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_set_domain\n" );
#endif
    int found = 0;
    ( void ) cntrl;

    if ( PAPI_DOM_USER & domain )
        found = 1;

    if ( PAPI_DOM_KERNEL & domain )
        found = 1;

    if ( PAPI_DOM_OTHER & domain )
        found = 1;

    if ( !found )
        return ( PAPI_EINVAL );

    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_reset( hwd_context_t * ctx, hwd_control_state_t * ptr )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_reset\n" );
#endif
    ( void ) ctx;
    int retval;
    L2UNIT_control_state_t * this_state = ( L2UNIT_control_state_t * ) ptr;

    /* we can't simply call Bgpm_Reset() since PAPI doesn't have the 
     restriction that an EventSet has to be stopped before resetting is
     possible. However, BGPM does have this restriction. 
     Hence we need to stop, reset and start */
    retval = Bgpm_Stop( this_state->EventGroup );
    CHECK_BGPM_ERROR( retval, "Bgpm_Stop" );
    
    retval = Bgpm_ResetStart( this_state->EventGroup );
    CHECK_BGPM_ERROR( retval, "Bgpm_ResetStart" );
    
    return ( PAPI_OK );
}


/*
 * Native Event functions
 */
int
L2UNIT_ntv_enum_events( unsigned int *EventCode, int modifier )
{
#ifdef DEBUG_BGQ
    //printf( "L2UNIT_ntv_enum_events, EventCode = %x\n", *EventCode );
#endif

    switch ( modifier ) {
    case PAPI_ENUM_FIRST:
        *EventCode = 0;

        return ( PAPI_OK );
        break;

    case PAPI_ENUM_EVENTS:
    {
        int index = ( *EventCode ) + OFFSET;

        if ( index < L2UNIT_MAX_COUNTERS ) {
            *EventCode = *EventCode + 1;
            return ( PAPI_OK );
        } else
            return ( PAPI_ENOEVNT );

        break;
    }
    default:
        return ( PAPI_EINVAL );
    }
    return ( PAPI_EINVAL );
}


/*
 *
 */
int
L2UNIT_ntv_name_to_code( char *name, unsigned int *event_code )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_ntv_name_to_code\n" );
#endif
    int ret;
    
    /* Return event id matching a given event label string */
    ret = Bgpm_GetEventIdFromLabel ( name );
    
    if ( ret <= 0 ) {
#ifdef DEBUG_BGPM
        printf ("Error: ret value is %d for BGPM API function '%s'.\n",
                ret, "Bgpm_GetEventIdFromLabel" );
#endif
        return PAPI_ENOEVNT;
    }
    else if ( ret < OFFSET || ret > L2UNIT_MAX_COUNTERS ) // not a L2Unit event
        return PAPI_ENOEVNT;
    else
        *event_code = ( ret - OFFSET );

    return PAPI_OK;
}


/*
 *
 */
int
L2UNIT_ntv_code_to_name( unsigned int EventCode, char *name, int len )
{
#ifdef DEBUG_BGQ
    //printf( "L2UNIT_ntv_code_to_name\n" );
#endif
    int index;
    
    index = ( EventCode ) + OFFSET;

    if ( index >= MAX_COUNTERS )
        return PAPI_ENOEVNT;

    strncpy( name, Bgpm_GetEventIdLabel( index ), len );
    
    if ( name == NULL ) {
#ifdef DEBUG_BGPM
        printf ("Error: ret value is NULL for BGPM API function Bgpm_GetEventIdLabel.\n" );
#endif
        return PAPI_ENOEVNT;
    }
    
    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_ntv_code_to_descr( unsigned int EventCode, char *name, int len )
{
#ifdef DEBUG_BGQ
    //printf( "L2UNIT_ntv_code_to_descr\n" );
#endif
    int retval, index;
    
    index = ( EventCode ) + OFFSET;
    
    retval = Bgpm_GetLongDesc( index, name, &len );
    CHECK_BGPM_ERROR( retval, "Bgpm_GetLongDesc" );                      

    return ( PAPI_OK );
}


/*
 *
 */
int
L2UNIT_ntv_code_to_bits( unsigned int EventCode, hwd_register_t * bits )
{
#ifdef DEBUG_BGQ
    printf( "L2UNIT_ntv_code_to_bits\n" );
#endif
    ( void ) EventCode;
    ( void ) bits;
    return ( PAPI_OK );
}


/*
 *
 */
papi_vector_t _L2unit_vector = {
    .cmp_info = {
                 /* default component information (unspecified values are initialized to 0) */
                 .name = "bgpm/L2Unit",
                 .short_name = "L2Unit",
                 .description = "Blue Gene/Q L2Unit component",
                 .num_cntrs = L2UNIT_MAX_COUNTERS,
                 .num_mpx_cntrs = L2UNIT_MAX_COUNTERS,
                 .default_domain = PAPI_DOM_USER,
                 .available_domains = PAPI_DOM_USER | PAPI_DOM_KERNEL,
                 .default_granularity = PAPI_GRN_THR,
                 .available_granularities = PAPI_GRN_THR,
        
                 .hardware_intr_sig = PAPI_INT_SIGNAL,
                 .hardware_intr = 1,
        
                 .kernel_multiplex = 0,

                 /* component specific cmp_info initializations */
                 .fast_real_timer = 0,
                 .fast_virtual_timer = 0,
                 .attach = 0,
                 .attach_must_ptrace = 0,
                 }
    ,

    /* sizes of framework-opaque component-private structures */
    .size = {
             .context = sizeof ( L2UNIT_context_t ),
             .control_state = sizeof ( L2UNIT_control_state_t ),
             .reg_value = sizeof ( L2UNIT_register_t ),
             .reg_alloc = sizeof ( L2UNIT_reg_alloc_t ),
             }
    ,
    /* function pointers in this component */
    .init_thread = L2UNIT_init_thread,
    .init_component = L2UNIT_init_component,
    .init_control_state = L2UNIT_init_control_state,
    .start = L2UNIT_start,
    .stop = L2UNIT_stop,
    .read = L2UNIT_read,
    .shutdown_thread = L2UNIT_shutdown_thread,
    .set_overflow = L2UNIT_set_overflow,
    .cleanup_eventset = L2UNIT_cleanup_eventset,
    .ctl = L2UNIT_ctl,

    .update_control_state = L2UNIT_update_control_state,
    .set_domain = L2UNIT_set_domain,
    .reset = L2UNIT_reset,

    .ntv_name_to_code = L2UNIT_ntv_name_to_code,
    .ntv_enum_events = L2UNIT_ntv_enum_events,
    .ntv_code_to_name = L2UNIT_ntv_code_to_name,
    .ntv_code_to_descr = L2UNIT_ntv_code_to_descr,
    .ntv_code_to_bits = L2UNIT_ntv_code_to_bits
};