pk/trace/pk_trace_big.c


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//-----------------------------------------------------------------------------
// *! (C) Copyright International Business Machines Corp. 2014
// *! All Rights Reserved -- Property of IBM
// *! *** IBM Confidential ***
//-----------------------------------------------------------------------------

/// \file pk_trace_big.c
/// \brief PK Trace function that supports up to four 32-bit parameters
///
/// The pk_trace_big function is only called (via some macro magic) if the
/// caller passes in a single parameter (not including the format string)
/// that is larger than 16 bits to the PK_TRACE(...) macro.
///

#include "pk.h"
#include "pk_trace.h"

#if (PK_TRACE_SUPPORT && PK_TIMER_SUPPORT)
void pk_trace_big(uint32_t i_hash_and_count,
                  uint64_t i_parm1, uint64_t i_parm2)
{
    PkTraceBig          footer;
    PkTraceBig*         footer_ptr;
    PkTraceState        state;
    uint64_t*           ptr64;
    uint64_t            tb64;
    PkMachineContext    ctx;
    uint32_t            parm_size;
    uint32_t            cur_offset;
    uint32_t            footer_offset;

    //fill in the footer data
    tb64 = pk_timebase_get();
    footer.parms.word32 = i_hash_and_count; //this has the parm count and hash
    state.tbu32 = tb64 >> 32;
    footer.time_format.word32 = tb64 & 0x00000000ffffffffull;
    footer.time_format.format = PK_TRACE_FORMAT_BIG;

    //round up to 8 byte boundary
    if(footer.parms.num_parms <= 2)
    {
        parm_size = 8;
    }
    else
    {
        parm_size = 16;
    }

    //*****The following operations must be done atomically*****
    pk_critical_section_enter(&ctx);

    //load in the offset in the cb for the entry we are adding
    cur_offset = g_pk_trace_buf.state.offset;

    //Find the offset for the footer (at the end of the entry)
    footer_offset = cur_offset + parm_size;

    //calculate the address of the footer
    ptr64 = (uint64_t*)&g_pk_trace_buf.cb[footer_offset & PK_TRACE_CB_MASK];

    //calculate the offset for the next entry in the cb
    state.offset = footer_offset + sizeof(PkTraceBig);

    //update the cb state (tbu and offset)
    g_pk_trace_buf.state.word64 = state.word64;

    //write the data to the circular buffer including the
    //timesamp, string hash, and 16bit parameter
    *ptr64 = footer.word64;

    //*******************exit the critical section***************
    pk_critical_section_exit(&ctx);


    //write parm values to the circular buffer
    footer_ptr = (PkTraceBig*)ptr64;
    ptr64 = (uint64_t*)&g_pk_trace_buf.cb[cur_offset & PK_TRACE_CB_MASK];
    *ptr64 = i_parm1;
    if(parm_size > 8)
    {
        ptr64 = (uint64_t*)&g_pk_trace_buf.cb[(cur_offset + 8) & PK_TRACE_CB_MASK];
        *ptr64 = i_parm2;
    }

    //Mark the trace entry update as being completed
    footer_ptr->parms.complete = 1;

}

#endif