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//-----------------------------------------------------------------------------
// *! (C) Copyright International Business Machines Corp. 2014
// *! All Rights Reserved -- Property of IBM
// *! *** IBM Confidential ***
//-----------------------------------------------------------------------------
/// \file pk_trace_core.c
/// \brief PK Trace core data and code.
///
/// This file includes the minimal code/data required to do minimal tracing.
/// This includes the periodic timer initialization and the pk_trace_tiny
/// function. The pk_trace_tiny function is called by the PK_TRACE() macro
/// when there is one or less parameters (not including the format string)
/// and the parameter size is 16 bits or smaller.
///
#include "pk.h"
#include "pk_trace.h"
void pk_trace_timer_callback(void* arg);
#if (PK_TRACE_SUPPORT && PK_TIMER_SUPPORT)
//Static initialization of the trace timer
PkTimer g_pk_trace_timer = {
.deque.next = 0,
.deque.previous = 0,
.timeout = 0,
.callback = pk_trace_timer_callback,
.arg = 0,
.options = PK_TIMER_CALLBACK_PREEMPTIBLE,
};
//Static initialization of the pk trace buffer
PkTraceBuffer g_pk_trace_buf =
{
.version = PK_TRACE_VERSION,
.image_str = PPE_IMG_STRING,
.hash_prefix = PK_TRACE_HASH_PREFIX,
.partial_trace_hash = trace_adal_hash("PARTIAL TRACE ENTRY. HASH_ID = %d", PK_TRACE_HASH_PREFIX),
.size = PK_TRACE_SZ,
.max_time_change = PK_TRACE_MTBT,
.hz = 500000000, //default value. Actual value is set in pk_init.c
.time_adj64 = 0,
.state.word64 = 0,
.cb = {0}
};
//Needed for buffer extraction in simics for now
PkTraceBuffer* g_pk_trace_buf_ptr = &g_pk_trace_buf;
// Creates an 8 byte entry in the trace buffer that includes a timestamp,
// a format string hash value and a 16 bit parameter.
//
// i_parm has the hash value combined with the 16 bit parameter
void pk_trace_tiny(uint32_t i_parm)
{
PkTraceTiny footer;
PkTraceState state;
uint64_t* ptr64;
uint64_t tb64;
PkMachineContext ctx;
//fill in the footer data
footer.parms.word32 = i_parm;
tb64 = pk_timebase_get();
state.tbu32 = tb64 >> 32;
footer.time_format.word32 = tb64 & 0x00000000ffffffffull;
footer.time_format.format = PK_TRACE_FORMAT_TINY;
//The following operations must be done atomically
pk_critical_section_enter(&ctx);
//load the current byte count and calculate the address for this
//entry in the cb
ptr64 = (uint64_t*)&g_pk_trace_buf.cb[g_pk_trace_buf.state.offset & PK_TRACE_CB_MASK];
//calculate the offset for the next entry in the cb
state.offset = g_pk_trace_buf.state.offset + sizeof(PkTraceTiny);
//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);
}
// This function is called periodically in order to ensure that the max ticks
// between trace entries is no more than what will fit inside a 32bit value.
void pk_trace_timer_callback(void* arg)
{
// guarantee at least one trace before the lower 32bit timebase flips
PK_TRACE("PERIODIC TIMESTAMPING TRACE");
// restart the timer
pk_timer_schedule(&g_pk_trace_timer,
PK_TRACE_TIMER_PERIOD);
}
// Use this function to synchronize the timebase between multiple PPEs.
// PPE A can send PPE B it's current timebase and then PPE B can set that
// as the current timebase for tracing purposes. It can also be used
// to set the current time to 0. This function changes the timebase for
// all entries that are currently in the trace buffer. Setting the current
// timebase to 0 will cause previous traces to have very large timestamps.
void pk_trace_set_timebase(PkTimebase timebase)
{
g_pk_trace_buf.time_adj64 = timebase - pk_timebase_get();
}
#endif
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