1/* 2 * Copyright (c) 2008 Mark D. Hill and David A. Wood 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "debug/RubyDma.hh" 30#include "debug/RubyStats.hh" 31#include "mem/protocol/SequencerMsg.hh" 32#include "mem/protocol/SequencerRequestType.hh" 33#include "mem/ruby/buffers/MessageBuffer.hh" 34#include "mem/ruby/system/DMASequencer.hh" 35#include "mem/ruby/system/System.hh" 36 37DMASequencer::DMASequencer(const Params *p) 38 : RubyPort(p) 39{ 40} 41 42void 43DMASequencer::init() 44{ 45 RubyPort::init(); 46 m_is_busy = false; 47 m_data_block_mask = ~ (~0 << RubySystem::getBlockSizeBits()); 48} 49 50RequestStatus 51DMASequencer::makeRequest(PacketPtr pkt) 52{ 53 if (m_is_busy) { 54 return RequestStatus_BufferFull; 55 } 56 57 uint64_t paddr = pkt->getAddr(); 58 uint8_t* data = pkt->getPtr<uint8_t>(true); 59 int len = pkt->getSize(); 60 bool write = pkt->isWrite(); 61 62 assert(!m_is_busy); // only support one outstanding DMA request 63 m_is_busy = true; 64 65 active_request.start_paddr = paddr; 66 active_request.write = write; 67 active_request.data = data; 68 active_request.len = len; 69 active_request.bytes_completed = 0; 70 active_request.bytes_issued = 0; 71 active_request.pkt = pkt; 72
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73 SequencerMsg *msg = new SequencerMsg(curCycle());
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73 SequencerMsg *msg = new SequencerMsg(clockEdge()); |
74 msg->getPhysicalAddress() = Address(paddr); 75 msg->getLineAddress() = line_address(msg->getPhysicalAddress()); 76 msg->getType() = write ? SequencerRequestType_ST : SequencerRequestType_LD; 77 int offset = paddr & m_data_block_mask; 78 79 msg->getLen() = (offset + len) <= RubySystem::getBlockSizeBytes() ? 80 len : RubySystem::getBlockSizeBytes() - offset; 81 82 if (write && (data != NULL)) { 83 if (active_request.data != NULL) { 84 msg->getDataBlk().setData(data, offset, msg->getLen()); 85 } 86 } 87 88 assert(m_mandatory_q_ptr != NULL); 89 m_mandatory_q_ptr->enqueue(msg); 90 active_request.bytes_issued += msg->getLen(); 91 92 return RequestStatus_Issued; 93} 94 95void 96DMASequencer::issueNext() 97{ 98 assert(m_is_busy == true); 99 active_request.bytes_completed = active_request.bytes_issued; 100 if (active_request.len == active_request.bytes_completed) { 101 // 102 // Must unset the busy flag before calling back the dma port because 103 // the callback may cause a previously nacked request to be reissued 104 // 105 DPRINTF(RubyDma, "DMA request completed\n"); 106 m_is_busy = false; 107 ruby_hit_callback(active_request.pkt); 108 return; 109 } 110
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111 SequencerMsg *msg = new SequencerMsg(curCycle());
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111 SequencerMsg *msg = new SequencerMsg(clockEdge()); |
112 msg->getPhysicalAddress() = Address(active_request.start_paddr + 113 active_request.bytes_completed); 114 115 assert((msg->getPhysicalAddress().getAddress() & m_data_block_mask) == 0); 116 msg->getLineAddress() = line_address(msg->getPhysicalAddress()); 117 118 msg->getType() = (active_request.write ? SequencerRequestType_ST : 119 SequencerRequestType_LD); 120 121 msg->getLen() = 122 (active_request.len - 123 active_request.bytes_completed < RubySystem::getBlockSizeBytes() ? 124 active_request.len - active_request.bytes_completed : 125 RubySystem::getBlockSizeBytes()); 126 127 if (active_request.write) { 128 msg->getDataBlk(). 129 setData(&active_request.data[active_request.bytes_completed], 130 0, msg->getLen()); 131 msg->getType() = SequencerRequestType_ST; 132 } else { 133 msg->getType() = SequencerRequestType_LD; 134 } 135 136 assert(m_mandatory_q_ptr != NULL); 137 m_mandatory_q_ptr->enqueue(msg); 138 active_request.bytes_issued += msg->getLen(); 139 DPRINTF(RubyDma, 140 "DMA request bytes issued %d, bytes completed %d, total len %d\n", 141 active_request.bytes_issued, active_request.bytes_completed, 142 active_request.len); 143} 144 145void 146DMASequencer::dataCallback(const DataBlock & dblk) 147{ 148 assert(m_is_busy == true); 149 int len = active_request.bytes_issued - active_request.bytes_completed; 150 int offset = 0; 151 if (active_request.bytes_completed == 0) 152 offset = active_request.start_paddr & m_data_block_mask; 153 assert(active_request.write == false); 154 if (active_request.data != NULL) { 155 memcpy(&active_request.data[active_request.bytes_completed], 156 dblk.getData(offset, len), len); 157 } 158 issueNext(); 159} 160 161void 162DMASequencer::ackCallback() 163{ 164 issueNext(); 165} 166 167void 168DMASequencer::recordRequestType(DMASequencerRequestType requestType) { 169 DPRINTF(RubyStats, "Recorded statistic: %s\n", 170 DMASequencerRequestType_to_string(requestType)); 171} 172 173DMASequencer * 174DMASequencerParams::create() 175{ 176 return new DMASequencer(this); 177}
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