src/gpu-compute/simple_pool_manager.cc

   1 /*
   2  * Copyright (c) 2015 Advanced Micro Devices, Inc.
   3  * All rights reserved.
   4  *
   5  * For use for simulation and test purposes only
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright notice,
  11  * this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright notice,
  14  * this list of conditions and the following disclaimer in the documentation
  15  * and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the copyright holder nor the names of its contributors
  18  * may be used to endorse or promote products derived from this software
  19  * without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  * Author: John Kalamatianos
  34  */
  35
  36 #include "gpu-compute/simple_pool_manager.hh"
  37
  38 #include "base/logging.hh"
  39
  40 // return the min number of elements that the manager can reserve given
  41 // a request for "size" elements
  42 uint32_t
  43 SimplePoolManager::minAllocatedElements(uint32_t size)
  44 {
  45     fatal_if(size <= 0 || size > poolSize(), "Illegal VGPR region size=%d\n",
  46              size);
  47
  48     return size % minAllocation() > 0 ?
  49         (minAllocation() - (size % minAllocation())) + size : size;
  50 }
  51
  52 std::string
  53 SimplePoolManager::printRegion()
  54 {
  55     std::string _cout;
  56     if (_reservedGroups == 0)
  57         _cout = "VRF is empty\n";
  58     else if (_reservedGroups > 0) {
  59         uint32_t reservedEntries = _reservedGroups * _regionSize;
  60         _cout = "VRF reserves " + std::to_string(reservedEntries) + " VGPRs\n";
  61     }
  62
  63     return _cout;
  64 }
  65
  66 bool
  67 SimplePoolManager::canAllocate(uint32_t numRegions, uint32_t size)
  68 {
  69     assert(numRegions * minAllocatedElements(size) <= poolSize());
  70
  71     return _reservedGroups == 0;
  72 }
  73
  74 void
  75 SimplePoolManager::freeRegion(uint32_t firstIdx, uint32_t lastIdx)
  76 {
  77     assert(_reservedGroups > 0);
  78     --_reservedGroups;
  79
  80     if (!_reservedGroups)
  81         _nxtFreeIdx = 0;
  82 }
  83
  84 uint32_t
  85 SimplePoolManager::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
  99 uint32_t
 100 SimplePoolManager::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 }