pmu.hh

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#ifndef __ARCH_ARM_PMU_HH__
#define __ARCH_ARM_PMU_HH__

#include <map>
#include <memory>
#include <vector>

#include "arch/arm/isa_device.hh"
#include "arch/arm/registers.hh"
#include "arch/arm/system.hh"
#include "base/cprintf.hh"
#include "cpu/base.hh"
#include "debug/PMUVerbose.hh"
#include "sim/eventq.hh"
#include "sim/sim_object.hh"
#include "sim/system.hh"

class ArmPMUParams;
class Platform;
class ThreadContext;
class ArmInterruptPin;

namespace ArmISA {


class PMU : public SimObject, public ArmISA::BaseISADevice {
  public:
    PMU(const ArmPMUParams *p);
    ~PMU();

    void addEventProbe(unsigned int id, SimObject *obj, const char *name);
    void addSoftwareIncrementEvent(unsigned int id);

    void registerEvent(uint32_t id);

  public: // SimObject and related interfaces
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

    void drainResume() override;

    void regProbeListeners() override;

  public: // ISA Device interface
    void setThreadContext(ThreadContext *tc) override;

    void setMiscReg(int misc_reg, RegVal val) override;
    RegVal readMiscReg(int misc_reg) override;

  protected: // PMU register types and constants
    BitUnion32(PMCR_t)
        // PMU Enable
        Bitfield<0> e;
        // Event counter reset
        Bitfield<1> p;
        // Cycle counter reset
        Bitfield<2> c;
        // Cycle counter divider enable
        Bitfield<3> d;
        // Export enable
        Bitfield<4> x;
        // Disable PMCCNTR when event counting is prohibited
        Bitfield<5> dp;
        // Long Cycle counter enable
        Bitfield<6> lc;
        // Number of event counters implemented
        Bitfield<15, 11> n;
        // Implementation ID
        Bitfield<23, 16> idcode;
        // Implementer code
        Bitfield<31, 24> imp;
    EndBitUnion(PMCR_t)

    BitUnion32(PMSELR_t)
        // Performance counter selector
        Bitfield<4, 0> sel;
    EndBitUnion(PMSELR_t)

    BitUnion32(PMEVTYPER_t)
        Bitfield<15, 0> evtCount;

        // Secure EL3 filtering
        Bitfield<26> m;
        // Non-secure EL2 mode filtering
        Bitfield<27> nsh;
        // Non-secure EL0 mode filtering
        Bitfield<28> nsu;
        // Non-secure EL1 mode filtering
        Bitfield<29> nsk;
        // EL0 filtering
        Bitfield<30> u;
        // EL1 filtering
        Bitfield<31> p;
    EndBitUnion(PMEVTYPER_t)

    typedef unsigned int CounterId;

    static const CounterId PMCCNTR = 31;

    typedef unsigned int EventTypeId;

  protected: /* High-level register and interrupt handling */
    RegVal readMiscRegInt(int misc_reg);

    void setControlReg(PMCR_t val);

    void resetEventCounts();

    void raiseInterrupt();

    void clearInterrupt();

    uint64_t getCounterValue(CounterId id) const {
        return isValidCounter(id) ? getCounter(id).getValue() : 0;
    }

    void setCounterValue(CounterId id, uint64_t val);

    PMEVTYPER_t getCounterTypeRegister(CounterId id) const;

    void setCounterTypeRegister(CounterId id, PMEVTYPER_t type);

    void setOverflowStatus(RegVal new_val);

  protected: /* Probe handling and counter state */
    struct CounterState;

    struct PMUEvent {

        PMUEvent() {}

        virtual ~PMUEvent() {}

        void attachEvent(PMU::CounterState *user);

        void detachEvent(PMU::CounterState *user);

        virtual void increment(const uint64_t val);

        virtual void enable() = 0;

        virtual void disable() = 0;

        virtual void updateAttachedCounters() {}

      protected:

        std::set<PMU::CounterState*> userCounters;
    };

    struct RegularEvent : public PMUEvent {
        typedef std::pair<SimObject*, std::string> EventTypeEntry;

        void addMicroarchitectureProbe(SimObject* object,
            std::string name) {

            panic_if(!object,"malformed probe-point"
                " definition with name %s\n", name);

            microArchitectureEventSet.emplace(object, name);
        }

      protected:
        struct RegularProbe: public  ProbeListenerArgBase<uint64_t>
        {
            RegularProbe(RegularEvent *parent, SimObject* obj,
                std::string name)
                : ProbeListenerArgBase(obj->getProbeManager(), name),
                  parentEvent(parent) {}

            RegularProbe() = delete;

            void notify(const uint64_t &val);

          protected:
            RegularEvent *parentEvent;
        };

        std::set<EventTypeEntry> microArchitectureEventSet;

        std::vector<std::unique_ptr<RegularProbe>> attachedProbePointList;

        void enable() override;

        void disable() override;
    };

    class SWIncrementEvent : public PMUEvent
    {
        void enable() override {}
        void disable() override {}

      public:

        void write(uint64_t val);
    };

    PMUEvent* getEvent(uint64_t eventId);

    struct CounterState : public Serializable {
        CounterState(PMU &pmuReference, uint64_t counter_id)
            : eventId(0), filter(0), enabled(false),
              overflow64(false), sourceEvent(nullptr),
              counterId(counter_id), value(0), resetValue(false),
              pmu(pmuReference) {}

        void serialize(CheckpointOut &cp) const override;
        void unserialize(CheckpointIn &cp)  override;

        uint64_t add(uint64_t delta);

        bool isFiltered() const;

        void detach();

        void attach(PMUEvent* event);

        uint64_t getCounterId() const{
            return counterId;
        }

        uint64_t getValue() const;

        void setValue(uint64_t val);

      public: /* Serializable state */
        EventTypeId eventId;

        PMEVTYPER_t filter;

        bool enabled;

        bool overflow64;

      protected: /* Configuration */
        PMUEvent *sourceEvent;

        uint64_t counterId;

        uint64_t value;

        bool resetValue;

        PMU &pmu;

        template <typename ...Args>
        void debugCounter(const char* mainString, Args &...args) const {

            std::string userString = csprintf(mainString, args...);

            warn("[counterId = %d, eventId = %d, sourceEvent = 0x%x] %s",
                counterId, eventId, sourceEvent, userString.c_str());

        }
    };

    bool isValidCounter(CounterId id) const {
        return id < counters.size() || id == PMCCNTR;
    }

    CounterState &getCounter(CounterId id) {
        assert(isValidCounter(id));
        return id == PMCCNTR ? cycleCounter : counters[id];
    }

    const CounterState &getCounter(CounterId id) const {
        assert(isValidCounter(id));
        return id == PMCCNTR ? cycleCounter : counters[id];
    }

    void updateCounter(CounterState &ctr);

    bool isFiltered(const CounterState &ctr) const;

    void updateAllCounters();

  protected: /* State that needs to be serialized */
    RegVal reg_pmcnten;

    PMCR_t reg_pmcr;

    PMSELR_t reg_pmselr;

    RegVal reg_pminten;

    RegVal reg_pmovsr;

    uint64_t reg_pmceid0;
    uint64_t reg_pmceid1;

    unsigned clock_remainder;

    uint64_t maximumCounterCount;

    std::vector<CounterState> counters;

    CounterState cycleCounter;

    const uint64_t cycleCounterEventId;

    SWIncrementEvent *swIncrementEvent;

  protected: /* Configuration and constants */
    PMCR_t reg_pmcr_conf;

    static const RegVal reg_pmcr_wr_mask;

    ArmInterruptPin *interrupt;

    std::map<EventTypeId, PMUEvent*> eventMap;
};

} // namespace ArmISA
#endif