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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/ssx/trace/ssx_trace_core.c $ */
/* */
/* OpenPOWER OnChipController Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
//-----------------------------------------------------------------------------
// *! (C) Copyright International Business Machines Corp. 2014
// *! All Rights Reserved -- Property of IBM
// *! *** IBM Confidential ***
//-----------------------------------------------------------------------------
/// \file ssx_trace_core.c
/// \brief SSX 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 ssx_trace_tiny
/// function. The ssx_trace_tiny function is called by the SSX_TRACE() macro
/// when there is one or less parameters (not including the format string)
/// and the parameter size is 16 bits or smaller.
///
#include "ssx.h"
#include "ssx_trace.h"
void ssx_trace_timer_callback(void* arg);
#if (SSX_TRACE_SUPPORT && SSX_TIMER_SUPPORT)
//Static initialization of the trace timer
SsxTimer g_ssx_trace_timer = {
.deque = SSX_DEQUE_ELEMENT_INIT(),
.timeout = 0,
.callback = ssx_trace_timer_callback,
.arg = 0,
.options = SSX_TIMER_CALLBACK_PREEMPTIBLE,
};
//Static initialization of the ssx trace buffer
SsxTraceBuffer g_ssx_trace_buf =
{
.version = SSX_TRACE_VERSION,
.image_str = PPC_IMG_STRING,
.hash_prefix = SSX_TRACE_HASH_PREFIX,
.partial_trace_hash = trace_ppe_hash("PARTIAL TRACE ENTRY. HASH_ID = %d", SSX_TRACE_HASH_PREFIX),
.size = SSX_TRACE_SZ,
.max_time_change = SSX_TRACE_MTBT,
.hz = 500000000, //default value. Actual value is set in ssx_init.c
.time_adj64 = 0,
.state.word64 = 0,
.cb = {0}
};
//Needed for buffer extraction in simics for now
SsxTraceBuffer* g_ssx_trace_buf_ptr = &g_ssx_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 ssx_trace_tiny(uint32_t i_parm)
{
SsxTraceTiny footer;
SsxTraceState state;
uint64_t* ptr64;
uint64_t tb64;
SsxMachineContext ctx;
//fill in the footer data
footer.parms.word32 = i_parm;
tb64 = ssx_ext_timebase_get();
state.tbu32 = tb64 >> 32;
footer.time_format.word32 = tb64 & 0x00000000ffffffffull;
footer.time_format.format = SSX_TRACE_FORMAT_TINY;
//The following operations must be done atomically
ssx_critical_section_enter(SSX_NONCRITICAL, &ctx);
//load the current byte count and calculate the address for this
//entry in the cb
ptr64 = (uint64_t*)&g_ssx_trace_buf.cb[g_ssx_trace_buf.state.offset & SSX_TRACE_CB_MASK];
//calculate the offset for the next entry in the cb
state.offset = g_ssx_trace_buf.state.offset + sizeof(SsxTraceTiny);
//update the cb state (tbu and offset)
g_ssx_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
ssx_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 ssx_trace_timer_callback(void* arg)
{
// guarantee at least one trace before the lower 32bit timebase flips
SSX_TRACE("PERIODIC TIMESTAMPING TRACE");
// restart the timer
ssx_timer_schedule(&g_ssx_trace_timer,
SSX_TRACE_TIMER_PERIOD,
0);
}
// Use this function to synchronize the timebase between multiple Processors.
// proc A can send proc B it's current timebase and then proc 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 ssx_trace_set_timebase(SsxTimebase timebase)
{
g_ssx_trace_buf.time_adj64 = timebase - ssx_ext_timebase_get();
}
void ssx_trace_init(uint32_t timebase_frequency_hz,
SsxTimebase initial_timebase)
{
//set the trace timebase HZ (used by parsing tools)
g_ssx_trace_buf.hz = timebase_frequency_hz;
if(initial_timebase != SSX_TIMEBASE_CONTINUES)
{
//Set the timebase adjustment. The external timebase
//is not adjustable so we use a software adjustment instead.
//Typically, this should only be used by the first processor to come
//up in order to set the timebase to 0. Other processors
//will want to synchronize with the first processor's timebase.
ssx_trace_set_timebase(initial_timebase);
}
// Schedule the timer that puts a timestamp in the trace buffer
// periodically. This allows us to use 32bit timestamps.
ssx_timer_schedule(&g_ssx_trace_timer,
SSX_TRACE_TIMER_PERIOD,
0);
}
////Needed for easy cache flush of trace buffer
size_t g_ssx_trace_buf_size=sizeof(g_ssx_trace_buf);
#endif
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