mshr_queue.hh

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#ifndef __MEM_CACHE_MSHR_QUEUE_HH__
#define __MEM_CACHE_MSHR_QUEUE_HH__
 
#include <string>
 
#include "base/types.hh"
#include "mem/cache/mshr.hh"
#include "mem/cache/queue.hh"
#include "mem/packet.hh"
 
namespace gem5
{
 
class MSHRQueue : public Queue<MSHR>
{
  private:
 
    const int demandReserve;
 
  public:
 
    MSHRQueue(const std::string &_label, int num_entries, int reserve,
              int demand_reserve, std::string cache_name);
 
    MSHR *allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt,
                   Tick when_ready, Counter order, bool alloc_on_fill);
 
    void deallocate(MSHR *mshr) override;
 
    void moveToFront(MSHR *mshr);
 
    void delay(MSHR *mshr, Tick delay_ticks);
 
    void markInService(MSHR *mshr, bool pending_modified_resp);
 
    void markPending(MSHR *mshr);
 
    bool forceDeallocateTarget(MSHR *mshr);
 
    bool havePending() const
    {
        return !readyList.empty();
    }
 
    bool canPrefetch() const
    {
        // @todo we may want to revisit the +1, currently added to
        // keep regressions unchanged
        return (allocated < numEntries - (numReserve + 1 + demandReserve));
    }
};
 
} // namespace gem5
 
#endif //__MEM_CACHE_MSHR_QUEUE_HH__