src/gpu-compute/pool_manager.hh

/*
 * Copyright (c) 2015-2017 Advanced Micro Devices, Inc.
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#ifndef __POOL_MANAGER_HH__
#define __POOL_MANAGER_HH__

#include <cassert>
#include <cstdint>
#include <string>

#include "params/PoolManager.hh"
#include "sim/sim_object.hh"

namespace gem5
{

// Pool Manager Logic
class PoolManager : public SimObject
{
  public:
    PoolManager(const PoolManagerParams &p);
    virtual ~PoolManager() { _poolSize = 0; }
    uint32_t minAllocation() { return _minAllocation; }
    virtual std::string printRegion() = 0;
    virtual uint32_t regionSize(std::pair<uint32_t,uint32_t> &region) = 0;
    virtual bool canAllocate(uint32_t numRegions, uint32_t size) = 0;

    virtual uint32_t allocateRegion(const uint32_t size,
                                    uint32_t *reserved) = 0;

    virtual void freeRegion(uint32_t firstIdx, uint32_t lastIdx) = 0;
    uint32_t poolSize() { return _poolSize; }
    // I don't think with the current API it is possible to do what
    // we intend to - reset the entire register pool.
    // Because we need to reset the register pool when all WGs on
    // the Compute Unit are finished - before launching WGs from
    // another kernel.
    // TsungTai Yeh added a virtual method do the very same - at a diff
    // place though.
    virtual void resetRegion(const int & regsPerSimd) {}; // do nothing

  private:
    // minimum size that can be reserved per allocation
    uint32_t _minAllocation;
    // pool size in number of elements
    uint32_t _poolSize;
};

} // namespace gem5

#endif // __POOL_MANAGER_HH__