1/*
2 * Copyright (c) 2014-2015 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 * Authors: Anthony Gutierrez,
34 *          Sooraj Puthoor
35 */
36
37#include "gpu-compute/fetch_stage.hh"
38
39#include "gpu-compute/compute_unit.hh"
40#include "gpu-compute/wavefront.hh"
41
42FetchStage::FetchStage(const ComputeUnitParams* p) : numSIMDs(p->num_SIMDs),
43    computeUnit(nullptr)
44{
45    for (int j = 0; j < numSIMDs; ++j) {
46        FetchUnit newFetchUnit(p);
47        fetchUnit.push_back(newFetchUnit);
48    }
49}
50
51FetchStage::~FetchStage()
52{
53    fetchUnit.clear();
54}
55
56void
57FetchStage::init(ComputeUnit *cu)
58{
59    computeUnit = cu;
60    _name = computeUnit->name() + ".FetchStage";
61
62    for (int j = 0; j < numSIMDs; ++j) {
63        fetchUnit[j].bindWaveList(&computeUnit->wfList[j]);
64        fetchUnit[j].init(computeUnit);
65    }
66}
67
68void
69FetchStage::exec()
70{
71    for (int j = 0; j < numSIMDs; ++j) {
72        fetchUnit[j].exec();
73    }
74}
75
76void
77FetchStage::processFetchReturn(PacketPtr pkt)
78{
79    ComputeUnit::SQCPort::SenderState *sender_state =
80        safe_cast<ComputeUnit::SQCPort::SenderState*>(pkt->senderState);
81
82    Wavefront *wavefront = sender_state->wavefront;
83
84    const unsigned num_instructions = pkt->req->getSize() /
85        sizeof(TheGpuISA::RawMachInst);
86
87    instFetchInstReturned.sample(num_instructions);
88    uint32_t simdId = wavefront->simdId;
89    fetchUnit[simdId].processFetchReturn(pkt);
90}
91
92void
93FetchStage::fetch(PacketPtr pkt, Wavefront *wavefront)
94{
95    fetchUnit[wavefront->simdId].fetch(pkt, wavefront);
96}
97
98void
99FetchStage::regStats()
100{
101    instFetchInstReturned
102        .init(1, 32, 1)
103        .name(name() + ".inst_fetch_instr_returned")
104        .desc("For each instruction fetch request recieved record how many "
105              "instructions you got from it")
106        ;
107}
108