mirror of https://github.com/rusefi/rusefi-1.git
125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
/**
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* @file perf_trace.cpp
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*
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* See JsonOutput.java in rusEfi console
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*/
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#include "efifeatures.h"
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#include "perf_trace.h"
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#include "efitime.h"
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#include "os_util.h"
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#ifndef TRACE_BUFFER_LENGTH
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#define TRACE_BUFFER_LENGTH 2048
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#endif /* TRACE_BUFFER_LENGTH */
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enum class EPhase : char
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{
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Start,
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End,
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InstantThread,
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InstantGlobal,
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};
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struct TraceEntry
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{
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PE Event;
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EPhase Phase;
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int8_t IsrId;
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uint8_t ThreadId;
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uint32_t Timestamp;
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};
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// Ensure that the struct is the size we think it is - the binary layout is important
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static_assert(sizeof(TraceEntry) == 8);
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// This buffer stores a trace - we write the full buffer once, then disable tracing
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static TraceEntry s_traceBuffer[TRACE_BUFFER_LENGTH];
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static size_t s_nextIdx = 0;
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static bool s_isTracing = false;
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static void perfEventImpl(PE event, EPhase phase)
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{
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// Bail if we aren't allowed to trace
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if constexpr (!ENABLE_PERF_TRACE) {
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return;
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}
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// Bail if we aren't tracing
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if (!s_isTracing) {
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return;
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}
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// todo: why doesn't getTimeNowLowerNt() work here?
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// It returns 0 like we're in a unit test
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uint32_t timestamp = port_rt_get_counter_value();
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size_t idx;
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// Critical section: disable interrupts to reserve an index.
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// We could lock, but this gets called a LOT - so locks could
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// significantly alter the results of the measurement.
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// In addition, if we want to trace lock/unlock events, we can't
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// be locking ourselves from the trace functionality.
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{
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uint32_t prim = __get_PRIMASK();
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__disable_irq();
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idx = s_nextIdx++;
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if (s_nextIdx >= TRACE_BUFFER_LENGTH) {
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s_nextIdx = 0;
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s_isTracing = false;
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}
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// Restore previous interrupt state - don't restore if they weren't enabled
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if (!prim) {
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__enable_irq();
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}
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}
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// We can safely write data out of the lock, our spot is reserved
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volatile TraceEntry& entry = s_traceBuffer[idx];
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entry.Event = event;
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entry.Phase = phase;
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// Get the current active interrupt - this is the "process ID"
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auto isr = static_cast<int8_t>(SCB->ICSR & SCB_ICSR_VECTACTIVE_Msk);
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entry.IsrId = isr - 16;
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// Get the current thread (if not interrupt) and use as the thread ID
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if (isr == 0) {
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entry.ThreadId = chThdGetSelfX()->threadId;
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} else {
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// Interrupts have no thread - all are T0
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entry.ThreadId = 0;
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}
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entry.Timestamp = timestamp;
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}
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void perfEventBegin(PE event) {
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perfEventImpl(event, EPhase::Start);
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}
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void perfEventEnd(PE event) {
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perfEventImpl(event, EPhase::End);
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}
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void perfEventInstantGlobal(PE event) {
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perfEventImpl(event, EPhase::InstantGlobal);
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}
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void perfTraceEnable() {
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s_isTracing = true;
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}
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const TraceBufferResult perfTraceGetBuffer() {
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// stop tracing if you try to get the buffer early
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s_isTracing = false;
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return {reinterpret_cast<const uint8_t*>(s_traceBuffer), sizeof(s_traceBuffer)};
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}
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