gpu-compute: AMD's baseline GPU model

1 files changed, 108 insertions, 0 deletions

diff --git a/src/gpu-compute/simple_pool_manager.cc b/src/gpu-compute/simple_pool_manager.cc
new file mode 100644
index 000000000..0e35ab9cc
--- /dev/null
+++ b/src/gpu-compute/simple_pool_manager.cc
@@ -0,0 +1,108 @@
+/*
+ * 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;
+    }
+}