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authorTony Gutierrez <anthony.gutierrez@amd.com>2016-01-19 14:28:22 -0500
committerTony Gutierrez <anthony.gutierrez@amd.com>2016-01-19 14:28:22 -0500
commit1a7d3f9fcb76a68540dd948f91413533a383bfde (patch)
tree867510a147cd095f19499d26b7c02d27de4cae9d /src/gpu-compute/simple_pool_manager.cc
parent28e353e0403ea379d244a418e8dc8ee0b48187cf (diff)
downloadgem5-1a7d3f9fcb76a68540dd948f91413533a383bfde.tar.xz
gpu-compute: AMD's baseline GPU model
Diffstat (limited to 'src/gpu-compute/simple_pool_manager.cc')
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diff --git a/src/gpu-compute/simple_pool_manager.cc b/src/gpu-compute/simple_pool_manager.cc
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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.
+ *
+ * Author: John Kalamatianos
+ */
+
+#include "gpu-compute/simple_pool_manager.hh"
+
+#include "base/misc.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> &region)
+{
+ bool wrapAround = (region.first > region.second);
+ if (!wrapAround) {
+ return region.second - region.first + 1;
+ } else {
+ return region.second + poolSize() - region.first + 1;
+ }
+}