local_memory_pipeline.hh revision 11308 
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 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: Sooraj Puthoor
34 */
35
36#ifndef __LOCAL_MEMORY_PIPELINE_HH__
37#define __LOCAL_MEMORY_PIPELINE_HH__
38
39#include <queue>
40#include <string>
41
42#include "gpu-compute/misc.hh"
43#include "params/ComputeUnit.hh"
44#include "sim/stats.hh"
45
46/*
47 * @file local_memory_pipeline.hh
48 *
49 * The local memory pipeline issues newly created local memory packets
50 * from pipeline to the LDS. This stage also retires previously issued
51 * loads and stores that have returned from the LDS.
52 */
53
54class ComputeUnit;
55class Wavefront;
56
57class LocalMemPipeline
58{
59  public:
60    LocalMemPipeline(const ComputeUnitParams *params);
61    void init(ComputeUnit *cu);
62    void exec();
63
64    template<typename c0, typename c1> void doSmReturn(GPUDynInstPtr m);
65
66    std::queue<GPUDynInstPtr> &getLMReqFIFO() { return lmIssuedRequests; }
67    std::queue<GPUDynInstPtr> &getLMRespFIFO() { return lmReturnedRequests; }
68
69    bool
70    isLMRespFIFOWrRdy() const
71    {
72        return lmReturnedRequests.size() < lmQueueSize;
73    }
74
75    bool
76    isLMReqFIFOWrRdy(uint32_t pendReqs=0) const
77    {
78        return (lmIssuedRequests.size() + pendReqs) < lmQueueSize;
79    }
80
81    const std::string& name() const { return _name; }
82    void regStats();
83
84  private:
85    ComputeUnit *computeUnit;
86    std::string _name;
87    int lmQueueSize;
88    Stats::Scalar loadVrfBankConflictCycles;
89    // Local Memory Request Fifo: all shared memory requests
90    // are issued to this FIFO from the memory pipelines
91    std::queue<GPUDynInstPtr> lmIssuedRequests;
92
93    // Local Memory Response Fifo: all responses of shared memory
94    // requests are sent to this FIFO from LDS
95    std::queue<GPUDynInstPtr> lmReturnedRequests;
96};
97
98#endif // __LOCAL_MEMORY_PIPELINE_HH__
99