smmu_v3_transl.hh

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/*
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 *
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
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#ifndef __DEV_ARM_SMMU_V3_TRANSL_HH__
#define __DEV_ARM_SMMU_V3_TRANSL_HH__

#include "base/compiler.hh"
#include "dev/arm/smmu_v3_proc.hh"
#include "dev/arm/smmu_v3_ptops.hh"
#include "dev/arm/smmu_v3_slaveifc.hh"
#include "mem/packet.hh"

struct SMMUTranslRequest
{
    Addr     addr;
    unsigned size;
    uint32_t sid;  // streamId
    uint32_t ssid; // substreamId
    bool     isWrite;
    bool     isPrefetch;
    bool     isAtsRequest;

    PacketPtr pkt;

    static SMMUTranslRequest fromPacket(PacketPtr pkt, bool ats = false);
    static SMMUTranslRequest prefetch(Addr addr, uint32_t sid, uint32_t ssid);
};

class SMMUTranslationProcess : public SMMUProcess
{
  private:
    struct TranslContext
    {
        bool stage1Enable;
        bool stage2Enable;
        Addr ttb0, ttb1, httb;
        uint16_t asid;
        uint16_t vmid;
        uint8_t stage1TranslGranule;
        uint8_t stage2TranslGranule;
        uint8_t t0sz;
        uint8_t s2t0sz;
    };

    enum FaultType
    {
        FAULT_NONE,
        FAULT_TRANSLATION, // F_TRANSLATION
        FAULT_PERMISSION,  // F_PERMISSION
    };

    struct TranslResult
    {
        FaultType  fault;
        Addr       addr;
        Addr       addrMask;
        bool       writable;
    };

    SMMUv3SlaveInterface &ifc;

    SMMUTranslRequest request;
    TranslContext context;

    Tick recvTick;
    Tick M5_CLASS_VAR_USED faultTick;

    virtual void main(Yield &yield);

    TranslResult bypass(Addr addr) const;
    TranslResult smmuTranslation(Yield &yield);

    bool microTLBLookup(Yield &yield, TranslResult &tr);
    bool ifcTLBLookup(Yield &yield, TranslResult &tr, bool &wasPrefetched);
    bool smmuTLBLookup(Yield &yield, TranslResult &tr);

    void microTLBUpdate(Yield &yield, const TranslResult &tr);
    void ifcTLBUpdate(Yield &yield, const TranslResult &tr);
    void smmuTLBUpdate(Yield &yield, const TranslResult &tr);

    bool configCacheLookup(Yield &yield, TranslContext &tc);
    void configCacheUpdate(Yield &yield, const TranslContext &tc);
    bool findConfig(Yield &yield, TranslContext &tc, TranslResult &tr);

    void walkCacheLookup(Yield &yield,
                         const WalkCache::Entry *&walkEntry,
                         Addr addr, uint16_t asid, uint16_t vmid,
                         unsigned stage, unsigned level);

    void walkCacheUpdate(Yield &yield, Addr va, Addr vaMask, Addr pa,
                         unsigned stage, unsigned level,
                         bool leaf, uint8_t permissions);

    TranslResult walkStage1And2(Yield &yield, Addr addr,
                                const PageTableOps *pt_ops,
                                unsigned level, Addr walkPtr);

    TranslResult walkStage2(Yield &yield, Addr addr, bool final_tr,
                            const PageTableOps *pt_ops,
                            unsigned level, Addr walkPtr);

    TranslResult translateStage1And2(Yield &yield, Addr addr);
    TranslResult translateStage2(Yield &yield, Addr addr, bool final_tr);

    TranslResult combineTranslations(const TranslResult &s1tr,
                                     const TranslResult &s2tr) const;

    bool hazard4kCheck();
    void hazard4kRegister();
    void hazard4kHold(Yield &yield);
    void hazard4kRelease();

    void hazardIdRegister();
    void hazardIdHold(Yield &yield);
    void hazardIdRelease();

    void issuePrefetch(Addr addr);

    void completeTransaction(Yield &yield, const TranslResult &tr);
    void completePrefetch(Yield &yield);

    void sendEvent(Yield &yield, const SMMUEvent &ev);

    void doReadSTE(Yield &yield, StreamTableEntry &ste, uint32_t sid);
    void doReadCD(Yield &yield, ContextDescriptor &cd,
                  const StreamTableEntry &ste, uint32_t sid, uint32_t ssid);
    void doReadConfig(Yield &yield, Addr addr, void *ptr, size_t size,
                      uint32_t sid, uint32_t ssid);
    void doReadPTE(Yield &yield, Addr va, Addr addr, void *ptr,
                   unsigned stage, unsigned level);

  public:
    SMMUTranslationProcess(const std::string &name, SMMUv3 &_smmu,
        SMMUv3SlaveInterface &_ifc);

    virtual ~SMMUTranslationProcess();

    void beginTransaction(const SMMUTranslRequest &req);
    void resumeTransaction();
};

#endif /* __DEV_ARM_SMMU_V3_TRANSL_HH__ */