simple_pool_manager.cc revision 11308
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324997Sgblack@eecs.umich.edu *
334997Sgblack@eecs.umich.edu * Author: John Kalamatianos
344997Sgblack@eecs.umich.edu */
354997Sgblack@eecs.umich.edu
365019Sgblack@eecs.umich.edu#include "gpu-compute/simple_pool_manager.hh"
375019Sgblack@eecs.umich.edu
385019Sgblack@eecs.umich.edu#include "base/misc.hh"
395019Sgblack@eecs.umich.edu
405019Sgblack@eecs.umich.edu// return the min number of elements that the manager can reserve given
415019Sgblack@eecs.umich.edu// a request for "size" elements
425019Sgblack@eecs.umich.eduuint32_t
435019Sgblack@eecs.umich.eduSimplePoolManager::minAllocatedElements(uint32_t size)
445019Sgblack@eecs.umich.edu{
455019Sgblack@eecs.umich.edu    fatal_if(size <= 0 || size > poolSize(), "Illegal VGPR region size=%d\n",
465019Sgblack@eecs.umich.edu             size);
475019Sgblack@eecs.umich.edu
485019Sgblack@eecs.umich.edu    return size % minAllocation() > 0 ?
495019Sgblack@eecs.umich.edu        (minAllocation() - (size % minAllocation())) + size : size;
505019Sgblack@eecs.umich.edu}
515019Sgblack@eecs.umich.edu
525019Sgblack@eecs.umich.edustd::string
535019Sgblack@eecs.umich.eduSimplePoolManager::printRegion()
545014Sgblack@eecs.umich.edu{
555014Sgblack@eecs.umich.edu    std::string _cout;
565014Sgblack@eecs.umich.edu    if (_reservedGroups == 0)
575014Sgblack@eecs.umich.edu        _cout = "VRF is empty\n";
585014Sgblack@eecs.umich.edu    else if (_reservedGroups > 0) {
595014Sgblack@eecs.umich.edu        uint32_t reservedEntries = _reservedGroups * _regionSize;
605014Sgblack@eecs.umich.edu        _cout = "VRF reserves " + std::to_string(reservedEntries) + " VGPRs\n";
615014Sgblack@eecs.umich.edu    }
625014Sgblack@eecs.umich.edu
635014Sgblack@eecs.umich.edu    return _cout;
645014Sgblack@eecs.umich.edu}
654997Sgblack@eecs.umich.edu
664997Sgblack@eecs.umich.edubool
674997Sgblack@eecs.umich.eduSimplePoolManager::canAllocate(uint32_t numRegions, uint32_t size)
684997Sgblack@eecs.umich.edu{
694997Sgblack@eecs.umich.edu    assert(numRegions * minAllocatedElements(size) <= poolSize());
705034Smilesck@eecs.umich.edu
714997Sgblack@eecs.umich.edu    return _reservedGroups == 0;
724997Sgblack@eecs.umich.edu}
734997Sgblack@eecs.umich.edu
744997Sgblack@eecs.umich.eduvoid
754997Sgblack@eecs.umich.eduSimplePoolManager::freeRegion(uint32_t firstIdx, uint32_t lastIdx)
765034Smilesck@eecs.umich.edu{
774997Sgblack@eecs.umich.edu    assert(_reservedGroups > 0);
78    --_reservedGroups;
79
80    if (!_reservedGroups)
81        _nxtFreeIdx = 0;
82}
83
84uint32_t
85SimplePoolManager::allocateRegion(const uint32_t size,
86                                  uint32_t *reservedPoolSize)
87{
88    uint32_t actualSize = minAllocatedElements(size);
89    uint32_t startIdx = _nxtFreeIdx;
90    _nxtFreeIdx += actualSize;
91    _regionSize = actualSize;
92    assert(_nxtFreeIdx < poolSize());
93    *reservedPoolSize = actualSize;
94    ++_reservedGroups;
95
96    return startIdx;
97}
98
99uint32_t
100SimplePoolManager::regionSize(std::pair<uint32_t, uint32_t> &region)
101{
102    bool wrapAround = (region.first > region.second);
103    if (!wrapAround) {
104        return region.second - region.first + 1;
105    } else {
106        return region.second + poolSize() - region.first + 1;
107    }
108}
109