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//===----------------------- HWEventListener.h ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines the main interface for hardware event listeners.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_MCA_HWEVENTLISTENER_H
#define LLVM_TOOLS_LLVM_MCA_HWEVENTLISTENER_H
#include "Instruction.h"
#include "llvm/ADT/ArrayRef.h"
#include <utility>
namespace mca {
// An HWInstructionEvent represents state changes of instructions that
// listeners might be interested in. Listeners can choose to ignore any event
// they are not interested in.
class HWInstructionEvent {
public:
// This is the list of event types that are shared by all targets, that
// generic subtarget-agnostic classes (e.g., Pipeline, HWInstructionEvent,
// ...) and generic Views can manipulate.
// Subtargets are free to define additional event types, that are goin to be
// handled by generic components as opaque values, but can still be
// emitted by subtarget-specific pipeline stages (e.g., ExecuteStage,
// DispatchStage, ...) and interpreted by subtarget-specific EventListener
// implementations.
enum GenericEventType {
Invalid = 0,
// Events generated by the Retire Control Unit.
Retired,
// Events generated by the Scheduler.
Ready,
Issued,
Executed,
// Events generated by the Dispatch logic.
Dispatched,
LastGenericEventType,
};
HWInstructionEvent(unsigned type, const InstRef &Inst)
: Type(type), IR(Inst) {}
// The event type. The exact meaning depends on the subtarget.
const unsigned Type;
// The instruction this event was generated for.
const InstRef &IR;
};
class HWInstructionIssuedEvent : public HWInstructionEvent {
public:
using ResourceRef = std::pair<uint64_t, uint64_t>;
HWInstructionIssuedEvent(const InstRef &IR,
llvm::ArrayRef<std::pair<ResourceRef, double>> UR)
: HWInstructionEvent(HWInstructionEvent::Issued, IR), UsedResources(UR) {}
llvm::ArrayRef<std::pair<ResourceRef, double>> UsedResources;
};
class HWInstructionDispatchedEvent : public HWInstructionEvent {
public:
HWInstructionDispatchedEvent(const InstRef &IR, llvm::ArrayRef<unsigned> Regs)
: HWInstructionEvent(HWInstructionEvent::Dispatched, IR),
UsedPhysRegs(Regs) {}
// Number of physical register allocated for this instruction. There is one
// entry per register file.
llvm::ArrayRef<unsigned> UsedPhysRegs;
};
class HWInstructionRetiredEvent : public HWInstructionEvent {
public:
HWInstructionRetiredEvent(const InstRef &IR, llvm::ArrayRef<unsigned> Regs)
: HWInstructionEvent(HWInstructionEvent::Retired, IR),
FreedPhysRegs(Regs) {}
// Number of register writes that have been architecturally committed. There
// is one entry per register file.
llvm::ArrayRef<unsigned> FreedPhysRegs;
};
// A HWStallEvent represents a pipeline stall caused by the lack of hardware
// resources.
class HWStallEvent {
public:
enum GenericEventType {
Invalid = 0,
// Generic stall events generated by the DispatchStage.
RegisterFileStall,
RetireControlUnitStall,
// Generic stall events generated by the Scheduler.
DispatchGroupStall,
SchedulerQueueFull,
LoadQueueFull,
StoreQueueFull,
LastGenericEvent
};
HWStallEvent(unsigned type, const InstRef &Inst) : Type(type), IR(Inst) {}
// The exact meaning of the stall event type depends on the subtarget.
const unsigned Type;
// The instruction this event was generated for.
const InstRef &IR;
};
class HWEventListener {
public:
// Generic events generated by the pipeline.
virtual void onCycleBegin() {}
virtual void onCycleEnd() {}
virtual void onEvent(const HWInstructionEvent &Event) {}
virtual void onEvent(const HWStallEvent &Event) {}
using ResourceRef = std::pair<uint64_t, uint64_t>;
virtual void onResourceAvailable(const ResourceRef &RRef) {}
// Events generated by the Scheduler when buffered resources are
// consumed/freed.
virtual void onReservedBuffers(llvm::ArrayRef<unsigned> Buffers) {}
virtual void onReleasedBuffers(llvm::ArrayRef<unsigned> Buffers) {}
virtual ~HWEventListener() {}
private:
virtual void anchor();
};
} // namespace mca
#endif
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