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/*
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* Copyright (c) 2013 Advanced Micro Devices, Inc.
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#ifndef __CPU_O3_LSQ_HH__
#define __CPU_O3_LSQ_HH__
#include <cassert>
#include <cstdint>
#include <list>
#include <map>
#include <queue>
#include <vector>
#include "arch/generic/mmu.hh"
#include "arch/generic/tlb.hh"
#include "base/flags.hh"
#include "base/types.hh"
#include "cpu/inst_seq.hh"
#include "cpu/o3/dyn_inst_ptr.hh"
#include "cpu/utils.hh"
#include "enums/SMTQueuePolicy.hh"
#include "mem/port.hh"
#include "sim/sim_object.hh"
namespace gem5
{
struct BaseO3CPUParams;
namespace o3
{
class CPU;
class IEW;
class LSQUnit;
class LSQ
{
public:
class LSQRequest;
/**
* DcachePort class for the load/store queue.
*/
class DcachePort : public RequestPort
{
protected:
/** Pointer to LSQ. */
LSQ *lsq;
CPU *cpu;
public:
/** Default constructor. */
DcachePort(LSQ *_lsq, CPU *_cpu);
protected:
/** Timing version of receive. Handles writing back and
* completing the load or store that has returned from
* memory. */
virtual bool recvTimingResp(PacketPtr pkt);
virtual void recvTimingSnoopReq(PacketPtr pkt);
virtual void
recvFunctionalSnoop(PacketPtr pkt)
{
// @todo: Is there a need for potential invalidation here?
}
/** Handles doing a retry of the previous send. */
virtual void recvReqRetry();
/**
* As this CPU requires snooping to maintain the load store queue
* change the behaviour from the base CPU port.
*
* @return true since we have to snoop
*/
virtual bool isSnooping() const { return true; }
};
/** Memory operation metadata.
* This class holds the information about a memory operation. It lives
* from initiateAcc to resource deallocation at commit or squash.
* LSQRequest objects are owned by the LQ/SQ Entry in the LSQUnit that
* holds the operation. In addition, the LSQRequest is a TranslationState,
* therefore, upon squash, there must be a defined ownership transferal
* in case the LSQ resources are deallocated before the TLB is done using
* the TranslationState.
* If that happens, the LSQRequest will be self-owned, and responsible to
* detect that its services are no longer required and self-destruct.
*
* Lifetime of a LSQRequest:
* +--------------------+
* |LSQ creates and owns|
* +--------------------+
* |
* +--------------------+
* | Initate translation|
* +--------------------+
* |
* ___^___
* ___/ \___
* ______/ Squashed? \
* | \___ ___/
* | \___ ___/
* | v
* | |
* | +--------------------+
* | | Translation done |
* | +--------------------+
* | |
* | +--------------------+
* | | Send packet |<------+
* | +--------------------+ |
* | | |
* | ___^___ |
* | ___/ \___ |
* | ____/ Squashed? \ |
* | | \___ ___/ |
* | | \___ ___/ |
* | | v |
* | | | |
* | | ___^___ |
* | | ___/ \___ |
* | | / Done? \__________|
* | | \___ ___/
* | | \___ ___/
* | | v
* | | |
* | | +--------------------+
* | | | Manage stuff |
* | | | Free resources |
* | | +--------------------+
* | |
* | | +--------------------+
* | | | self owned |
* | +->| on recvTimingResp |
* | | free resources |
* | +--------------------+
* |
* | +----------------------+
* | | self owned (Trans) |
* +-->| on TranslationFinish |
* | free resources |
* +----------------------+
*
*
*/
class LSQRequest : public BaseMMU::Translation, public Packet::SenderState
{
protected:
typedef uint32_t FlagsStorage;
typedef Flags<FlagsStorage> FlagsType;
enum Flag : FlagsStorage
{
IsLoad = 0x00000001,
/** True if this request needs to writeBack to register.
* Will be set in case of load or a store/atomic
* that writes registers (SC)
*/
WriteBackToRegister = 0x00000002,
Delayed = 0x00000004,
IsSplit = 0x00000008,
/** True if any translation has been sent to TLB. */
TranslationStarted = 0x00000010,
/** True if there are un-replied outbound translations.. */
TranslationFinished = 0x00000020,
Sent = 0x00000040,
Retry = 0x00000080,
Complete = 0x00000100,
/** Ownership tracking flags. */
/** Translation squashed. */
TranslationSquashed = 0x00000200,
/** Request discarded */
Discarded = 0x00000400,
/** LSQ resources freed. */
LSQEntryFreed = 0x00000800,
/** Store written back. */
WritebackScheduled = 0x00001000,
WritebackDone = 0x00002000,
/** True if this is an atomic request */
IsAtomic = 0x00004000
};
FlagsType flags;
enum class State
{
NotIssued,
Translation,
Request,
Fault,
PartialFault,
};
State _state;
void setState(const State& newState) { _state = newState; }
uint32_t numTranslatedFragments;
uint32_t numInTranslationFragments;
void markDelayed() override { flags.set(Flag::Delayed); }
bool isDelayed() { return flags.isSet(Flag::Delayed); }
public:
LSQUnit& _port;
const DynInstPtr _inst;
uint32_t _taskId;
PacketDataPtr _data;
std::vector<PacketPtr> _packets;
std::vector<RequestPtr> _reqs;
std::vector<Fault> _fault;
uint64_t* _res;
const Addr _addr;
const uint32_t _size;
const Request::Flags _flags;
std::vector<bool> _byteEnable;
uint32_t _numOutstandingPackets;
AtomicOpFunctorPtr _amo_op;
bool _hasStaleTranslation;
protected:
LSQUnit* lsqUnit() { return &_port; }
LSQRequest(LSQUnit* port, const DynInstPtr& inst, bool isLoad);
LSQRequest(LSQUnit* port, const DynInstPtr& inst, bool isLoad,
const Addr& addr, const uint32_t& size,
const Request::Flags& flags_, PacketDataPtr data=nullptr,
uint64_t* res=nullptr, AtomicOpFunctorPtr amo_op=nullptr,
bool stale_translation=false);
bool
isLoad() const
{
return flags.isSet(Flag::IsLoad);
}
bool
isAtomic() const
{
return flags.isSet(Flag::IsAtomic);
}
/** Install the request in the LQ/SQ. */
void install();
bool squashed() const override;
/** Release the LSQRequest.
* Notify the sender state that the request it points to is not valid
* anymore. Understand if the request is orphan (self-managed) and if
* so, mark it as freed, else destroy it, as this means
* the end of its life cycle.
* An LSQRequest is orphan when its resources are released
* but there is any in-flight translation request to the TLB or access
* request to the memory.
*/
void
release(Flag reason)
{
assert(reason == Flag::LSQEntryFreed || reason == Flag::Discarded);
if (!isAnyOutstandingRequest()) {
delete this;
} else {
flags.set(reason);
}
}
/** Helper function used to add a (sub)request, given its address
* `addr`, size `size` and byte-enable mask `byteEnable`.
*
* The request is only added if there is at least one active
* element in the mask.
*/
void addReq(Addr addr, unsigned size,
const std::vector<bool>& byte_enable);
/** Destructor.
* The LSQRequest owns the request. If the packet has already been
* sent, the sender state will be deleted upon receiving the reply.
*/
virtual ~LSQRequest();
public:
/** Convenience getters/setters. */
/** @{ */
/** Set up Context numbers. */
void
setContext(const ContextID& context_id)
{
req()->setContext(context_id);
}
const DynInstPtr& instruction() { return _inst; }
bool hasStaleTranslation() const { return _hasStaleTranslation; }
virtual void markAsStaleTranslation() = 0;
/** Set up virtual request.
* For a previously allocated Request objects.
*/
void
setVirt(Addr vaddr, unsigned size, Request::Flags flags_,
RequestorID requestor_id, Addr pc)
{
req()->setVirt(vaddr, size, flags_, requestor_id, pc);
}
ContextID contextId() const;
void
taskId(const uint32_t& v)
{
_taskId = v;
for (auto& r: _reqs)
r->taskId(v);
}
uint32_t taskId() const { return _taskId; }
RequestPtr req(int idx = 0) { return _reqs.at(idx); }
const RequestPtr req(int idx = 0) const { return _reqs.at(idx); }
Addr getVaddr(int idx = 0) const { return req(idx)->getVaddr(); }
virtual void initiateTranslation() = 0;
PacketPtr packet(int idx = 0) { return _packets.at(idx); }
virtual PacketPtr
mainPacket()
{
assert (_packets.size() == 1);
return packet();
}
virtual RequestPtr
mainReq()
{
assert (_reqs.size() == 1);
return req();
}
/**
* Test if there is any in-flight translation or mem access request
*/
bool
isAnyOutstandingRequest()
{
return numInTranslationFragments > 0 ||
_numOutstandingPackets > 0 ||
(flags.isSet(Flag::WritebackScheduled) &&
!flags.isSet(Flag::WritebackDone));
}
/**
* Test if the LSQRequest has been released, i.e. self-owned.
* An LSQRequest manages itself when the resources on the LSQ are freed
* but the translation is still going on and the LSQEntry was freed.
*/
bool
isReleased()
{
return flags.isSet(Flag::LSQEntryFreed) ||
flags.isSet(Flag::Discarded);
}
bool
isSplit() const
{
return flags.isSet(Flag::IsSplit);
}
bool
needWBToRegister() const
{
return flags.isSet(Flag::WriteBackToRegister);
}
/** @} */
virtual bool recvTimingResp(PacketPtr pkt) = 0;
virtual void sendPacketToCache() = 0;
virtual void buildPackets() = 0;
/**
* Memory mapped IPR accesses
*/
virtual Cycles handleLocalAccess(
gem5::ThreadContext *thread, PacketPtr pkt) = 0;
/**
* Test if the request accesses a particular cache line.
*/
virtual bool isCacheBlockHit(Addr blockAddr, Addr cacheBlockMask) = 0;
/** Update the status to reflect that a packet was sent. */
void
packetSent()
{
flags.set(Flag::Sent);
}
/** Update the status to reflect that a packet was not sent.
* When a packet fails to be sent, we mark the request as needing a
* retry. Note that Retry flag is sticky.
*/
void
packetNotSent()
{
flags.set(Flag::Retry);
flags.clear(Flag::Sent);
}
void sendFragmentToTranslation(int i);
bool
isComplete()
{
return flags.isSet(Flag::Complete);
}
bool
isInTranslation()
{
return _state == State::Translation;
}
bool
isTranslationComplete()
{
return flags.isSet(Flag::TranslationStarted) &&
!isInTranslation();
}
bool
isTranslationBlocked()
{
return _state == State::Translation &&
flags.isSet(Flag::TranslationStarted) &&
!flags.isSet(Flag::TranslationFinished);
}
bool
isSent()
{
return flags.isSet(Flag::Sent);
}
bool
isPartialFault()
{
return _state == State::PartialFault;
}
bool
isMemAccessRequired()
{
return (_state == State::Request ||
(isPartialFault() && isLoad()));
}
void
setStateToFault()
{
setState(State::Fault);
}
/**
* The LSQ entry is cleared
*/
void
freeLSQEntry()
{
release(Flag::LSQEntryFreed);
}
/**
* The request is discarded (e.g. partial store-load forwarding)
*/
void
discard()
{
release(Flag::Discarded);
}
void
packetReplied()
{
assert(_numOutstandingPackets > 0);
_numOutstandingPackets--;
if (_numOutstandingPackets == 0 && isReleased())
delete this;
}
void
writebackScheduled()
{
assert(!flags.isSet(Flag::WritebackScheduled));
flags.set(Flag::WritebackScheduled);
}
void
writebackDone()
{
flags.set(Flag::WritebackDone);
/* If the lsq resources are already free */
if (isReleased()) {
delete this;
}
}
void
squashTranslation()
{
assert(numInTranslationFragments == 0);
flags.set(Flag::TranslationSquashed);
/* If we are on our own, self-destruct. */
if (isReleased()) {
delete this;
}
}
void
complete()
{
flags.set(Flag::Complete);
}
virtual std::string name() const { return "LSQRequest"; }
};
class SingleDataRequest : public LSQRequest
{
public:
SingleDataRequest(LSQUnit* port, const DynInstPtr& inst,
bool isLoad, const Addr& addr, const uint32_t& size,
const Request::Flags& flags_, PacketDataPtr data=nullptr,
uint64_t* res=nullptr, AtomicOpFunctorPtr amo_op=nullptr) :
LSQRequest(port, inst, isLoad, addr, size, flags_, data, res,
std::move(amo_op)) {}
virtual ~SingleDataRequest() {}
virtual void markAsStaleTranslation();
virtual void initiateTranslation();
virtual void finish(const Fault &fault, const RequestPtr &req,
gem5::ThreadContext* tc, BaseMMU::Mode mode);
virtual bool recvTimingResp(PacketPtr pkt);
virtual void sendPacketToCache();
virtual void buildPackets();
virtual Cycles handleLocalAccess(
gem5::ThreadContext *thread, PacketPtr pkt);
virtual bool isCacheBlockHit(Addr blockAddr, Addr cacheBlockMask);
virtual std::string name() const { return "SingleDataRequest"; }
};
// This class extends SingleDataRequest for the purpose
// of allowing special requests (eg Hardware transactional memory, TLB
// shootdowns) to bypass irrelevant system elements like translation &
// squashing.
class UnsquashableDirectRequest : public SingleDataRequest
{
public:
UnsquashableDirectRequest(LSQUnit* port, const DynInstPtr& inst,
const Request::Flags& flags_);
inline virtual ~UnsquashableDirectRequest() {}
virtual void initiateTranslation();
virtual void markAsStaleTranslation();
virtual void finish(const Fault &fault, const RequestPtr &req,
gem5::ThreadContext* tc, BaseMMU::Mode mode);
virtual std::string
name() const
{
return "UnsquashableDirectRequest";
}
};
class SplitDataRequest : public LSQRequest
{
protected:
uint32_t numFragments;
uint32_t numReceivedPackets;
RequestPtr _mainReq;
PacketPtr _mainPacket;
public:
SplitDataRequest(LSQUnit* port, const DynInstPtr& inst,
bool isLoad, const Addr& addr, const uint32_t& size,
const Request::Flags & flags_, PacketDataPtr data=nullptr,
uint64_t* res=nullptr) :
LSQRequest(port, inst, isLoad, addr, size, flags_, data, res,
nullptr),
numFragments(0),
numReceivedPackets(0),
_mainReq(nullptr),
_mainPacket(nullptr)
{
flags.set(Flag::IsSplit);
}
virtual ~SplitDataRequest()
{
if (_mainReq) {
_mainReq = nullptr;
}
if (_mainPacket) {
delete _mainPacket;
_mainPacket = nullptr;
}
}
virtual void markAsStaleTranslation();
virtual void finish(const Fault &fault, const RequestPtr &req,
gem5::ThreadContext* tc, BaseMMU::Mode mode);
virtual bool recvTimingResp(PacketPtr pkt);
virtual void initiateTranslation();
virtual void sendPacketToCache();
virtual void buildPackets();
virtual Cycles handleLocalAccess(
gem5::ThreadContext *thread, PacketPtr pkt);
virtual bool isCacheBlockHit(Addr blockAddr, Addr cacheBlockMask);
virtual RequestPtr mainReq();
virtual PacketPtr mainPacket();
virtual std::string name() const { return "SplitDataRequest"; }
};
/** Constructs an LSQ with the given parameters. */
LSQ(CPU *cpu_ptr, IEW *iew_ptr, const BaseO3CPUParams &params);
/** Returns the name of the LSQ. */
std::string name() const;
/** Sets the pointer to the list of active threads. */
void setActiveThreads(std::list<ThreadID> *at_ptr);
/** Perform sanity checks after a drain. */
void drainSanityCheck() const;
/** Has the LSQ drained? */
bool isDrained() const;
/** Takes over execution from another CPU's thread. */
void takeOverFrom();
/** Number of entries needed for the given amount of threads.*/
int entryAmount(ThreadID num_threads);
/** Ticks the LSQ. */
void tick();
/** Inserts a load into the LSQ. */
void insertLoad(const DynInstPtr &load_inst);
/** Inserts a store into the LSQ. */
void insertStore(const DynInstPtr &store_inst);
/** Executes a load. */
Fault executeLoad(const DynInstPtr &inst);
/** Executes a store. */
Fault executeStore(const DynInstPtr &inst);
/**
* Commits loads up until the given sequence number for a specific thread.
*/
void commitLoads(InstSeqNum &youngest_inst, ThreadID tid);
/**
* Commits stores up until the given sequence number for a specific thread.
*/
void commitStores(InstSeqNum &youngest_inst, ThreadID tid);
/**
* Attempts to write back stores until all cache ports are used or the
* interface becomes blocked.
*/
void writebackStores();
/** Same as above, but only for one thread. */
void writebackStores(ThreadID tid);
/**
* Squash instructions from a thread until the specified sequence number.
*/
void squash(const InstSeqNum &squashed_num, ThreadID tid);
/** Returns whether or not there was a memory ordering violation. */
bool violation();
/**
* Returns whether or not there was a memory ordering violation for a
* specific thread.
*/
bool violation(ThreadID tid);
/** Gets the instruction that caused the memory ordering violation. */
DynInstPtr getMemDepViolator(ThreadID tid);
/** Returns the head index of the load queue for a specific thread. */
int getLoadHead(ThreadID tid);
/** Returns the sequence number of the head of the load queue. */
InstSeqNum getLoadHeadSeqNum(ThreadID tid);
/** Returns the head index of the store queue. */
int getStoreHead(ThreadID tid);
/** Returns the sequence number of the head of the store queue. */
InstSeqNum getStoreHeadSeqNum(ThreadID tid);
/** Returns the number of instructions in all of the queues. */
int getCount();
/** Returns the number of instructions in the queues of one thread. */
int getCount(ThreadID tid);
/** Returns the total number of loads in the load queue. */
int numLoads();
/** Returns the total number of loads for a single thread. */
int numLoads(ThreadID tid);
/** Returns the total number of stores in the store queue. */
int numStores();
/** Returns the total number of stores for a single thread. */
int numStores(ThreadID tid);
// hardware transactional memory
int numHtmStarts(ThreadID tid) const;
int numHtmStops(ThreadID tid) const;
void resetHtmStartsStops(ThreadID tid);
uint64_t getLatestHtmUid(ThreadID tid) const;
void setLastRetiredHtmUid(ThreadID tid, uint64_t htmUid);
/** Returns the number of free load entries. */
unsigned numFreeLoadEntries();
/** Returns the number of free store entries. */
unsigned numFreeStoreEntries();
/** Returns the number of free entries for a specific thread. */
unsigned numFreeEntries(ThreadID tid);
/** Returns the number of free entries in the LQ for a specific thread. */
unsigned numFreeLoadEntries(ThreadID tid);
/** Returns the number of free entries in the SQ for a specific thread. */
unsigned numFreeStoreEntries(ThreadID tid);
/** Returns if the LSQ is full (either LQ or SQ is full). */
bool isFull();
/**
* Returns if the LSQ is full for a specific thread (either LQ or SQ is
* full).
*/
bool isFull(ThreadID tid);
/** Returns if the LSQ is empty (both LQ and SQ are empty). */
bool isEmpty() const;
/** Returns if all of the LQs are empty. */
bool lqEmpty() const;
/** Returns if all of the SQs are empty. */
bool sqEmpty() const;
/** Returns if any of the LQs are full. */
bool lqFull();
/** Returns if the LQ of a given thread is full. */
bool lqFull(ThreadID tid);
/** Returns if any of the SQs are full. */
bool sqFull();
/** Returns if the SQ of a given thread is full. */
bool sqFull(ThreadID tid);
/**
* Returns if the LSQ is stalled due to a memory operation that must be
* replayed.
*/
bool isStalled();
/**
* Returns if the LSQ of a specific thread is stalled due to a memory
* operation that must be replayed.
*/
bool isStalled(ThreadID tid);
/** Returns whether or not there are any stores to write back to memory. */
bool hasStoresToWB();
/** Returns whether or not a specific thread has any stores to write back
* to memory.
*/
bool hasStoresToWB(ThreadID tid);
/** Returns the number of stores a specific thread has to write back. */
int numStoresToWB(ThreadID tid);
/** Returns if the LSQ will write back to memory this cycle. */
bool willWB();
/** Returns if the LSQ of a specific thread will write back to memory this
* cycle.
*/
bool willWB(ThreadID tid);
/** Debugging function to print out all instructions. */
void dumpInsts() const;
/** Debugging function to print out instructions from a specific thread. */
void dumpInsts(ThreadID tid) const;
/** Executes a read operation, using the load specified at the load
* index.
*/
Fault read(LSQRequest* request, ssize_t load_idx);
/** Executes a store operation, using the store specified at the store
* index.
*/
Fault write(LSQRequest* request, uint8_t *data, ssize_t store_idx);
/** Checks if queues have any marked operations left,
* and sends the appropriate Sync Completion message if not.
*/
void checkStaleTranslations();
/**
* Retry the previous send that failed.
*/
void recvReqRetry();
void completeDataAccess(PacketPtr pkt);
/**
* Handles writing back and completing the load or store that has
* returned from memory.
*
* @param pkt Response packet from the memory sub-system
*/
bool recvTimingResp(PacketPtr pkt);
void recvTimingSnoopReq(PacketPtr pkt);
Fault pushRequest(const DynInstPtr& inst, bool isLoad, uint8_t *data,
unsigned int size, Addr addr, Request::Flags flags,
uint64_t *res, AtomicOpFunctorPtr amo_op,
const std::vector<bool>& byte_enable);
/** The CPU pointer. */
CPU *cpu;
/** The IEW stage pointer. */
IEW *iewStage;
/** Is D-cache blocked? */
bool cacheBlocked() const;
/** Set D-cache blocked status */
void cacheBlocked(bool v);
/** Is any store port available to use? */
bool cachePortAvailable(bool is_load) const;
/** Another store port is in use */
void cachePortBusy(bool is_load);
RequestPort &getDataPort() { return dcachePort; }
protected:
/** D-cache is blocked */
bool _cacheBlocked;
/** The number of cache ports available each cycle (stores only). */
int cacheStorePorts;
/** The number of used cache ports in this cycle by stores. */
int usedStorePorts;
/** The number of cache ports available each cycle (loads only). */
int cacheLoadPorts;
/** The number of used cache ports in this cycle by loads. */
int usedLoadPorts;
/** If the LSQ is currently waiting for stale translations */
bool waitingForStaleTranslation;
/** The ID if the transaction that made translations stale */
Addr staleTranslationWaitTxnId;
/** The LSQ policy for SMT mode. */
SMTQueuePolicy lsqPolicy;
/** Auxiliary function to calculate per-thread max LSQ allocation limit.
* Depending on a policy, number of entries and possibly number of threads
* and threshold, this function calculates how many resources each thread
* can occupy at most.
*/
static uint32_t
maxLSQAllocation(SMTQueuePolicy pol, uint32_t entries,
uint32_t numThreads, uint32_t SMTThreshold)
{
if (pol == SMTQueuePolicy::Dynamic) {
return entries;
} else if (pol == SMTQueuePolicy::Partitioned) {
//@todo:make work if part_amt doesnt divide evenly.
return entries / numThreads;
} else if (pol == SMTQueuePolicy::Threshold) {
//Divide up by threshold amount
//@todo: Should threads check the max and the total
//amount of the LSQ
return SMTThreshold;
}
return 0;
}
/** List of Active Threads in System. */
std::list<ThreadID> *activeThreads;
/** Total Size of LQ Entries. */
unsigned LQEntries;
/** Total Size of SQ Entries. */
unsigned SQEntries;
/** Max LQ Size - Used to Enforce Sharing Policies. */
unsigned maxLQEntries;
/** Max SQ Size - Used to Enforce Sharing Policies. */
unsigned maxSQEntries;
/** Data port. */
DcachePort dcachePort;
/** The LSQ units for individual threads. */
std::vector<LSQUnit> thread;
/** Number of Threads. */
ThreadID numThreads;
};
} // namespace o3
} // namespace gem5
#endif // __CPU_O3_LSQ_HH__