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/*
* Copyright (c) 2015 Advanced Micro Devices, Inc.
* All rights reserved.
*
* For use for simulation and test purposes only
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Authors: John Kalamatianos
*/
#include "gpu-compute/simple_pool_manager.hh"
#include "base/logging.hh"
// return the min number of elements that the manager can reserve given
// a request for "size" elements
uint32_t
SimplePoolManager::minAllocatedElements(uint32_t size)
{
fatal_if(size <= 0 || size > poolSize(), "Illegal VGPR region size=%d\n",
size);
return size % minAllocation() > 0 ?
(minAllocation() - (size % minAllocation())) + size : size;
}
std::string
SimplePoolManager::printRegion()
{
std::string _cout;
if (_reservedGroups == 0)
_cout = "VRF is empty\n";
else if (_reservedGroups > 0) {
uint32_t reservedEntries = _reservedGroups * _regionSize;
_cout = "VRF reserves " + std::to_string(reservedEntries) + " VGPRs\n";
}
return _cout;
}
bool
SimplePoolManager::canAllocate(uint32_t numRegions, uint32_t size)
{
assert(numRegions * minAllocatedElements(size) <= poolSize());
return _reservedGroups == 0;
}
void
SimplePoolManager::freeRegion(uint32_t firstIdx, uint32_t lastIdx)
{
assert(_reservedGroups > 0);
--_reservedGroups;
if (!_reservedGroups)
_nxtFreeIdx = 0;
}
uint32_t
SimplePoolManager::allocateRegion(const uint32_t size,
uint32_t *reservedPoolSize)
{
uint32_t actualSize = minAllocatedElements(size);
uint32_t startIdx = _nxtFreeIdx;
_nxtFreeIdx += actualSize;
_regionSize = actualSize;
assert(_nxtFreeIdx < poolSize());
*reservedPoolSize = actualSize;
++_reservedGroups;
return startIdx;
}
uint32_t
SimplePoolManager::regionSize(std::pair<uint32_t, uint32_t> ®ion)
{
bool wrapAround = (region.first > region.second);
if (!wrapAround) {
return region.second - region.first + 1;
} else {
return region.second + poolSize() - region.first + 1;
}
}
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