DMASequencer.cc revision 7915:bc39c93a5519
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 "mem/protocol/SequencerMsg.hh" 30#include "mem/protocol/SequencerRequestType.hh" 31#include "mem/ruby/buffers/MessageBuffer.hh" 32#include "mem/ruby/slicc_interface/AbstractController.hh" 33#include "mem/ruby/system/DMASequencer.hh" 34#include "mem/ruby/system/System.hh" 35 36DMASequencer::DMASequencer(const Params *p) 37 : RubyPort(p) 38{ 39} 40 41void 42DMASequencer::init() 43{ 44 RubyPort::init(); 45 m_is_busy = false; 46 m_data_block_mask = ~ (~0 << RubySystem::getBlockSizeBits()); 47} 48 49RequestStatus 50DMASequencer::makeRequest(const RubyRequest &request) 51{ 52 if (m_is_busy) { 53 return RequestStatus_BufferFull; 54 } 55 56 uint64_t paddr = request.paddr; 57 uint8_t* data = request.data; 58 int len = request.len; 59 bool write = false; 60 switch(request.type) { 61 case RubyRequestType_LD: 62 write = false; 63 break; 64 case RubyRequestType_ST: 65 write = true; 66 break; 67 case RubyRequestType_NULL: 68 case RubyRequestType_IFETCH: 69 case RubyRequestType_Load_Linked: 70 case RubyRequestType_Store_Conditional: 71 case RubyRequestType_RMW_Read: 72 case RubyRequestType_RMW_Write: 73 case RubyRequestType_Locked_RMW_Read: 74 case RubyRequestType_Locked_RMW_Write: 75 case RubyRequestType_NUM: 76 panic("DMASequencer::makeRequest does not support RubyRequestType"); 77 return RequestStatus_NULL; 78 } 79 80 assert(!m_is_busy); // only support one outstanding DMA request 81 m_is_busy = true; 82 83 active_request.start_paddr = paddr; 84 active_request.write = write; 85 active_request.data = data; 86 active_request.len = len; 87 active_request.bytes_completed = 0; 88 active_request.bytes_issued = 0; 89 active_request.pkt = request.pkt; 90 91 SequencerMsg *msg = new SequencerMsg; 92 msg->getPhysicalAddress() = Address(paddr); 93 msg->getLineAddress() = line_address(msg->getPhysicalAddress()); 94 msg->getType() = write ? SequencerRequestType_ST : SequencerRequestType_LD; 95 int offset = paddr & m_data_block_mask; 96 97 msg->getLen() = (offset + len) <= RubySystem::getBlockSizeBytes() ? 98 len : RubySystem::getBlockSizeBytes() - offset; 99 100 if (write && (data != NULL)) { 101 if (active_request.data != NULL) { 102 msg->getDataBlk().setData(data, offset, msg->getLen()); 103 } 104 } 105 106 assert(m_mandatory_q_ptr != NULL); 107 m_mandatory_q_ptr->enqueue(msg); 108 active_request.bytes_issued += msg->getLen(); 109 110 return RequestStatus_Issued; 111} 112 113void 114DMASequencer::issueNext() 115{ 116 assert(m_is_busy == true); 117 active_request.bytes_completed = active_request.bytes_issued; 118 if (active_request.len == active_request.bytes_completed) { 119 DPRINTF(RubyDma, "DMA request completed\n"); 120 ruby_hit_callback(active_request.pkt); 121 m_is_busy = false; 122 return; 123 } 124 125 SequencerMsg *msg = new SequencerMsg; 126 msg->getPhysicalAddress() = Address(active_request.start_paddr + 127 active_request.bytes_completed); 128 129 assert((msg->getPhysicalAddress().getAddress() & m_data_block_mask) == 0); 130 msg->getLineAddress() = line_address(msg->getPhysicalAddress()); 131 132 msg->getType() = (active_request.write ? SequencerRequestType_ST : 133 SequencerRequestType_LD); 134 135 msg->getLen() = 136 (active_request.len - 137 active_request.bytes_completed < RubySystem::getBlockSizeBytes() ? 138 active_request.len - active_request.bytes_completed : 139 RubySystem::getBlockSizeBytes()); 140 141 if (active_request.write) { 142 msg->getDataBlk(). 143 setData(&active_request.data[active_request.bytes_completed], 144 0, msg->getLen()); 145 msg->getType() = SequencerRequestType_ST; 146 } else { 147 msg->getType() = SequencerRequestType_LD; 148 } 149 150 assert(m_mandatory_q_ptr != NULL); 151 m_mandatory_q_ptr->enqueue(msg); 152 active_request.bytes_issued += msg->getLen(); 153 DPRINTF(RubyDma, "Next DMA segment issued to the DMA cntrl\n"); 154} 155 156void 157DMASequencer::dataCallback(const DataBlock & dblk) 158{ 159 assert(m_is_busy == true); 160 int len = active_request.bytes_issued - active_request.bytes_completed; 161 int offset = 0; 162 if (active_request.bytes_completed == 0) 163 offset = active_request.start_paddr & m_data_block_mask; 164 assert(active_request.write == false); 165 if (active_request.data != NULL) { 166 memcpy(&active_request.data[active_request.bytes_completed], 167 dblk.getData(offset, len), len); 168 } 169 issueNext(); 170} 171 172void 173DMASequencer::ackCallback() 174{ 175 issueNext(); 176} 177 178void 179DMASequencer::printConfig(std::ostream & out) 180{ 181} 182 183DMASequencer * 184DMASequencerParams::create() 185{ 186 return new DMASequencer(this); 187} 188