simple_pool_manager.cc revision 11308 
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/misc.hh"
39
40// return the min number of elements that the manager can reserve given
41// a request for "size" elements
42uint32_t
43SimplePoolManager::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
52std::string
53SimplePoolManager::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
66bool
67SimplePoolManager::canAllocate(uint32_t numRegions, uint32_t size)
68{
69    assert(numRegions * minAllocatedElements(size) <= poolSize());
70
71    return _reservedGroups == 0;
72}
73
74void
75SimplePoolManager::freeRegion(uint32_t firstIdx, uint32_t lastIdx)
76{
77    assert(_reservedGroups > 0);
78    --_reservedGroups;
79
80    if (!_reservedGroups)
81        _nxtFreeIdx = 0;
82}
83
84uint32_t
85SimplePoolManager::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
99uint32_t
100SimplePoolManager::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}
109