DMASequencer.cc revision 6368:cecc7019b458
112855Sgabeblack@google.com 212855Sgabeblack@google.com#include "mem/ruby/system/DMASequencer.hh" 312855Sgabeblack@google.com#include "mem/ruby/buffers/MessageBuffer.hh" 412855Sgabeblack@google.com#include "mem/ruby/slicc_interface/AbstractController.hh" 512855Sgabeblack@google.com 612855Sgabeblack@google.com/* SLICC generated types */ 712855Sgabeblack@google.com#include "mem/protocol/DMARequestMsg.hh" 812855Sgabeblack@google.com#include "mem/protocol/DMARequestType.hh" 912855Sgabeblack@google.com#include "mem/protocol/DMAResponseMsg.hh" 1012855Sgabeblack@google.com#include "mem/ruby/system/System.hh" 1112855Sgabeblack@google.com 1212855Sgabeblack@google.comDMASequencer::DMASequencer(const string & name) 1312855Sgabeblack@google.com : RubyPort(name) 1412855Sgabeblack@google.com{ 1512855Sgabeblack@google.com} 1612855Sgabeblack@google.com 1712855Sgabeblack@google.comvoid DMASequencer::init(const vector<string> & argv) 1812855Sgabeblack@google.com{ 1912855Sgabeblack@google.com m_version = -1; 2012855Sgabeblack@google.com m_controller = NULL; 2112855Sgabeblack@google.com for (size_t i=0;i<argv.size();i+=2) { 2212855Sgabeblack@google.com if (argv[i] == "controller") 2312855Sgabeblack@google.com m_controller = RubySystem::getController(argv[i+1]); 2412855Sgabeblack@google.com else if (argv[i] == "version") 2512855Sgabeblack@google.com m_version = atoi(argv[i+1].c_str()); 2612855Sgabeblack@google.com } 2712855Sgabeblack@google.com assert(m_controller != NULL); 2812855Sgabeblack@google.com assert(m_version != -1); 2912855Sgabeblack@google.com 3012855Sgabeblack@google.com m_mandatory_q_ptr = m_controller->getMandatoryQueue(); 3112855Sgabeblack@google.com m_is_busy = false; 3212855Sgabeblack@google.com m_data_block_mask = ~ (~0 << RubySystem::getBlockSizeBits()); 3312855Sgabeblack@google.com} 3412855Sgabeblack@google.com 3512855Sgabeblack@google.comint64_t DMASequencer::makeRequest(const RubyRequest & request) 3612855Sgabeblack@google.com{ 3712855Sgabeblack@google.com uint64_t paddr = request.paddr; 3812855Sgabeblack@google.com uint8_t* data = request.data; 3912855Sgabeblack@google.com int len = request.len; 4012855Sgabeblack@google.com bool write = false; 4112855Sgabeblack@google.com switch(request.type) { 4212855Sgabeblack@google.com case RubyRequestType_LD: 4312855Sgabeblack@google.com write = false; 4412855Sgabeblack@google.com break; 4512855Sgabeblack@google.com case RubyRequestType_ST: 4612855Sgabeblack@google.com write = true; 4712855Sgabeblack@google.com break; 4812855Sgabeblack@google.com case RubyRequestType_NULL: 4912855Sgabeblack@google.com case RubyRequestType_IFETCH: 5012855Sgabeblack@google.com case RubyRequestType_RMW: 5112855Sgabeblack@google.com assert(0); 5212855Sgabeblack@google.com } 5312855Sgabeblack@google.com 5412855Sgabeblack@google.com assert(!m_is_busy); // only support one outstanding DMA request 5512855Sgabeblack@google.com m_is_busy = true; 5612855Sgabeblack@google.com 5712855Sgabeblack@google.com active_request.start_paddr = paddr; 5812855Sgabeblack@google.com active_request.write = write; 5912855Sgabeblack@google.com active_request.data = data; 6012855Sgabeblack@google.com active_request.len = len; 6112855Sgabeblack@google.com active_request.bytes_completed = 0; 6212855Sgabeblack@google.com active_request.bytes_issued = 0; 6312855Sgabeblack@google.com active_request.id = makeUniqueRequestID(); 6412855Sgabeblack@google.com 6512855Sgabeblack@google.com DMARequestMsg msg; 6612855Sgabeblack@google.com msg.getPhysicalAddress() = Address(paddr); 6712855Sgabeblack@google.com msg.getLineAddress() = line_address(msg.getPhysicalAddress()); 6812855Sgabeblack@google.com msg.getType() = write ? DMARequestType_WRITE : DMARequestType_READ; 69 msg.getOffset() = paddr & m_data_block_mask; 70 msg.getLen() = (msg.getOffset() + len) <= RubySystem::getBlockSizeBytes() ? 71 len : 72 RubySystem::getBlockSizeBytes() - msg.getOffset(); 73 if (write) { 74 msg.getType() = DMARequestType_WRITE; 75 msg.getDataBlk().setData(data, msg.getOffset(), msg.getLen()); 76 } else { 77 msg.getType() = DMARequestType_READ; 78 } 79 m_mandatory_q_ptr->enqueue(msg); 80 active_request.bytes_issued += msg.getLen(); 81 82 return active_request.id; 83} 84 85void DMASequencer::issueNext() 86{ 87 assert(m_is_busy == true); 88 active_request.bytes_completed = active_request.bytes_issued; 89 if (active_request.len == active_request.bytes_completed) { 90 m_hit_callback(active_request.id); 91 m_is_busy = false; 92 return; 93 } 94 95 DMARequestMsg msg; 96 msg.getPhysicalAddress() = Address(active_request.start_paddr + 97 active_request.bytes_completed); 98 assert((msg.getPhysicalAddress().getAddress() & m_data_block_mask) == 0); 99 msg.getLineAddress() = line_address(msg.getPhysicalAddress()); 100 msg.getOffset() = 0; 101 msg.getType() = (active_request.write ? DMARequestType_WRITE : 102 DMARequestType_READ); 103 msg.getLen() = (active_request.len - 104 active_request.bytes_completed < RubySystem::getBlockSizeBytes() ? 105 active_request.len - active_request.bytes_completed : 106 RubySystem::getBlockSizeBytes()); 107 if (active_request.write) { 108 msg.getDataBlk().setData(&active_request.data[active_request.bytes_completed], 109 0, msg.getLen()); 110 msg.getType() = DMARequestType_WRITE; 111 } else { 112 msg.getType() = DMARequestType_READ; 113 } 114 m_mandatory_q_ptr->enqueue(msg); 115 active_request.bytes_issued += msg.getLen(); 116} 117 118void DMASequencer::dataCallback(const DataBlock & dblk) 119{ 120 assert(m_is_busy == true); 121 int len = active_request.bytes_issued - active_request.bytes_completed; 122 int offset = 0; 123 if (active_request.bytes_completed == 0) 124 offset = active_request.start_paddr & m_data_block_mask; 125 assert( active_request.write == false ); 126 memcpy(&active_request.data[active_request.bytes_completed], 127 dblk.getData(offset, len), len); 128 issueNext(); 129} 130 131void DMASequencer::ackCallback() 132{ 133 issueNext(); 134} 135 136void DMASequencer::printConfig(ostream & out) 137{ 138 139} 140