smmu_v3_slaveifc.hh

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/*
 * Copyright (c) 2013, 2018-2019 ARM Limited
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 * Authors: Stan Czerniawski
 */

#ifndef __DEV_ARM_SMMU_V3_SLAVEIFC_HH__
#define __DEV_ARM_SMMU_V3_SLAVEIFC_HH__

#include <list>

#include "dev/arm/smmu_v3_caches.hh"
#include "dev/arm/smmu_v3_defs.hh"
#include "dev/arm/smmu_v3_events.hh"
#include "dev/arm/smmu_v3_ports.hh"
#include "dev/arm/smmu_v3_proc.hh"
#include "params/SMMUv3SlaveInterface.hh"
#include "sim/clocked_object.hh"

class SMMUTranslationProcess;
class SMMUv3;
class SMMUSlavePort;

class SMMUv3SlaveInterface : public ClockedObject
{
  protected:
    friend class SMMUTranslationProcess;

  public:
    SMMUv3 *smmu;
    SMMUTLB* microTLB;
    SMMUTLB* mainTLB;

    const bool microTLBEnable;
    const bool mainTLBEnable;

    SMMUSemaphore slavePortSem;
    SMMUSemaphore microTLBSem;
    SMMUSemaphore mainTLBSem;

    const Cycles microTLBLat;
    const Cycles mainTLBLat;

    SMMUSlavePort *slavePort;
    SMMUATSSlavePort  atsSlavePort;
    SMMUATSMasterPort atsMasterPort;

    // in bytes
    const unsigned portWidth;

    unsigned wrBufSlotsRemaining;
    unsigned xlateSlotsRemaining;
    unsigned pendingMemAccesses;

    const bool prefetchEnable;
    const bool prefetchReserveLastWay;

    std::list<SMMUTranslationProcess *> duplicateReqs;
    SMMUSignal duplicateReqRemoved;

    std::list<SMMUTranslationProcess *> dependentReads[SMMU_MAX_TRANS_ID];
    std::list<SMMUTranslationProcess *> dependentWrites[SMMU_MAX_TRANS_ID];
    SMMUSignal dependentReqRemoved;

    // Receiving translation requests from the master device
    Tick recvAtomic(PacketPtr pkt);
    bool recvTimingReq(PacketPtr pkt);
    void schedTimingResp(PacketPtr pkt);

    Tick atsSlaveRecvAtomic(PacketPtr pkt);
    bool atsSlaveRecvTimingReq(PacketPtr pkt);
    bool atsMasterRecvTimingResp(PacketPtr pkt);
    void schedAtsTimingResp(PacketPtr pkt);

    void scheduleDeviceRetry();
    void sendDeviceRetry();
    void atsSendDeviceRetry();

    bool deviceNeedsRetry;
    bool atsDeviceNeedsRetry;

    SMMUDeviceRetryEvent sendDeviceRetryEvent;
    EventWrapper<
        SMMUv3SlaveInterface,
        &SMMUv3SlaveInterface::atsSendDeviceRetry> atsSendDeviceRetryEvent;

    Port& getPort(const std::string &name, PortID id) override;

  public:
    SMMUv3SlaveInterface(const SMMUv3SlaveInterfaceParams *p);

    ~SMMUv3SlaveInterface()
    {
        delete microTLB;
        delete mainTLB;
    }

    const SMMUv3SlaveInterfaceParams *
    params() const
    {
        return static_cast<const SMMUv3SlaveInterfaceParams *>(_params);
    }

    DrainState drain() override;

    void setSMMU(SMMUv3 *_smmu) { smmu = _smmu; }
    void sendRange();
};

#endif /* __DEV_ARM_SMMU_V3_SLAVEIFC_HH__ */