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
  18  * contributors may be used to endorse or promote products derived from this
  19  * software 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
  34 #include "gpu-compute/simple_pool_manager.hh"
  35
  36 #include "base/logging.hh"
  37
  38 // return the min number of elements that the manager can reserve given
  39 // a request for "size" elements
  40 uint32_t
  41 SimplePoolManager::minAllocatedElements(uint32_t size)
  42 {
  43     fatal_if(size <= 0 || size > poolSize(), "Illegal VGPR region size=%d\n",
  44              size);
  45
  46     return size % minAllocation() > 0 ?
  47         (minAllocation() - (size % minAllocation())) + size : size;
  48 }
  49
  50 std::string
  51 SimplePoolManager::printRegion()
  52 {
  53     std::string _cout;
  54     if (_reservedGroups == 0)
  55         _cout = "VRF is empty\n";
  56     else if (_reservedGroups > 0) {
  57         uint32_t reservedEntries = _reservedGroups * _regionSize;
  58         _cout = "VRF reserves " + std::to_string(reservedEntries) + " VGPRs\n";
  59     }
  60
  61     return _cout;
  62 }
  63
  64 bool
  65 SimplePoolManager::canAllocate(uint32_t numRegions, uint32_t size)
  66 {
  67     assert(numRegions * minAllocatedElements(size) <= poolSize());
  68
  69     return _reservedGroups == 0;
  70 }
  71
  72 void
  73 SimplePoolManager::freeRegion(uint32_t firstIdx, uint32_t lastIdx)
  74 {
  75     assert(_reservedGroups > 0);
  76     --_reservedGroups;
  77
  78     if (!_reservedGroups)
  79         _nxtFreeIdx = 0;
  80 }
  81
  82 uint32_t
  83 SimplePoolManager::allocateRegion(const uint32_t size,
  84                                   uint32_t *reservedPoolSize)
  85 {
  86     uint32_t actualSize = minAllocatedElements(size);
  87     uint32_t startIdx = _nxtFreeIdx;
  88     _nxtFreeIdx += actualSize;
  89     _regionSize = actualSize;
  90     assert(_nxtFreeIdx < poolSize());
  91     *reservedPoolSize = actualSize;
  92     ++_reservedGroups;
  93
  94     return startIdx;
  95 }
  96
  97 uint32_t
  98 SimplePoolManager::regionSize(std::pair<uint32_t, uint32_t> &region)
  99 {
 100     bool wrapAround = (region.first > region.second);
 101     if (!wrapAround) {
 102         return region.second - region.first + 1;
 103     } else {
 104         return region.second + poolSize() - region.first + 1;
 105     }
 106 }