dma_device.cc revision 9165:f9e3dac185ba
1/* 2 * Copyright (c) 2012 ARM Limited 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ali Saidi 41 * Nathan Binkert 42 */ 43 44#include "base/chunk_generator.hh" 45#include "debug/DMA.hh" 46#include "debug/Drain.hh" 47#include "dev/dma_device.hh" 48#include "sim/system.hh" 49 50DmaPort::DmaPort(MemObject *dev, System *s) 51 : MasterPort(dev->name() + ".dma", dev), device(dev), sys(s), 52 masterId(s->getMasterId(dev->name())), 53 pendingCount(0), drainEvent(NULL), 54 inRetry(false) 55{ } 56 57bool 58DmaPort::recvTimingResp(PacketPtr pkt) 59{ 60 if (pkt->senderState) { 61 DmaReqState *state; 62 63 DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 64 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 65 state = dynamic_cast<DmaReqState*>(pkt->senderState); 66 pendingCount--; 67 68 assert(pendingCount >= 0); 69 assert(state); 70 71 // We shouldn't ever get a block in ownership state 72 assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 73 74 state->numBytes += pkt->req->getSize(); 75 assert(state->totBytes >= state->numBytes); 76 if (state->totBytes == state->numBytes) { 77 if (state->completionEvent) { 78 if (state->delay) 79 device->schedule(state->completionEvent, 80 curTick() + state->delay); 81 else 82 state->completionEvent->process(); 83 } 84 delete state; 85 } 86 delete pkt->req; 87 delete pkt; 88 89 if (pendingCount == 0 && transmitList.empty() && drainEvent) { 90 drainEvent->process(); 91 drainEvent = NULL; 92 } 93 } else { 94 panic("Got packet without sender state... huh?\n"); 95 } 96 97 return true; 98} 99 100DmaDevice::DmaDevice(const Params *p) 101 : PioDevice(p), dmaPort(this, sys) 102{ } 103 104void 105DmaDevice::init() 106{ 107 if (!dmaPort.isConnected()) 108 panic("DMA port of %s not connected to anything!", name()); 109 PioDevice::init(); 110} 111 112unsigned int 113DmaDevice::drain(Event *de) 114{ 115 unsigned int count; 116 count = pioPort.drain(de) + dmaPort.drain(de); 117 if (count) 118 changeState(Draining); 119 else 120 changeState(Drained); 121 return count; 122} 123 124unsigned int 125DmaPort::drain(Event *de) 126{ 127 if (transmitList.empty() && pendingCount == 0) 128 return 0; 129 drainEvent = de; 130 DPRINTF(Drain, "DmaPort not drained\n"); 131 return 1; 132} 133 134void 135DmaPort::recvRetry() 136{ 137 assert(transmitList.size()); 138 bool result = true; 139 do { 140 PacketPtr pkt = transmitList.front(); 141 DPRINTF(DMA, "Retry on %s addr %#x\n", 142 pkt->cmdString(), pkt->getAddr()); 143 result = sendTimingReq(pkt); 144 if (result) { 145 DPRINTF(DMA, "-- Done\n"); 146 transmitList.pop_front(); 147 inRetry = false; 148 } else { 149 inRetry = true; 150 DPRINTF(DMA, "-- Failed, queued\n"); 151 } 152 } while (result && transmitList.size()); 153 154 DPRINTF(DMA, "TransmitList: %d, inRetry: %d\n", 155 transmitList.size(), inRetry); 156} 157 158void 159DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 160 uint8_t *data, Tick delay, Request::Flags flag) 161{ 162 DmaReqState *reqState = new DmaReqState(event, size, delay); 163 164 165 DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 166 event ? event->scheduled() : -1 ); 167 for (ChunkGenerator gen(addr, size, peerBlockSize()); 168 !gen.done(); gen.next()) { 169 Request *req = new Request(gen.addr(), gen.size(), flag, masterId); 170 PacketPtr pkt = new Packet(req, cmd); 171 172 // Increment the data pointer on a write 173 if (data) 174 pkt->dataStatic(data + gen.complete()); 175 176 pkt->senderState = reqState; 177 178 assert(pendingCount >= 0); 179 pendingCount++; 180 DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 181 gen.size()); 182 queueDma(pkt); 183 } 184 185} 186 187void 188DmaPort::queueDma(PacketPtr pkt, bool front) 189{ 190 191 if (front) 192 transmitList.push_front(pkt); 193 else 194 transmitList.push_back(pkt); 195 sendDma(); 196} 197 198void 199DmaPort::sendDma() 200{ 201 // some kind of selction between access methods 202 // more work is going to have to be done to make 203 // switching actually work 204 assert(transmitList.size()); 205 PacketPtr pkt = transmitList.front(); 206 207 Enums::MemoryMode state = sys->getMemoryMode(); 208 if (state == Enums::timing) { 209 if (inRetry) { 210 DPRINTF(DMA, "Can't send immediately, waiting for retry\n"); 211 return; 212 } 213 214 DPRINTF(DMA, "Attempting to send %s addr %#x\n", 215 pkt->cmdString(), pkt->getAddr()); 216 217 bool result; 218 do { 219 result = sendTimingReq(pkt); 220 if (result) { 221 transmitList.pop_front(); 222 DPRINTF(DMA, "-- Done\n"); 223 } else { 224 inRetry = true; 225 DPRINTF(DMA, "-- Failed: queued\n"); 226 } 227 } while (result && transmitList.size()); 228 } else if (state == Enums::atomic) { 229 transmitList.pop_front(); 230 231 Tick lat; 232 DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 233 pkt->req->getPaddr(), pkt->req->getSize()); 234 lat = sendAtomic(pkt); 235 assert(pkt->senderState); 236 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 237 assert(state); 238 state->numBytes += pkt->req->getSize(); 239 240 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 241 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 242 state->totBytes, 243 state->completionEvent ? state->completionEvent->scheduled() : 0 ); 244 245 if (state->totBytes == state->numBytes) { 246 if (state->completionEvent) { 247 assert(!state->completionEvent->scheduled()); 248 device->schedule(state->completionEvent, 249 curTick() + lat + state->delay); 250 } 251 delete state; 252 delete pkt->req; 253 } 254 pendingCount--; 255 assert(pendingCount >= 0); 256 delete pkt; 257 258 if (pendingCount == 0 && transmitList.empty() && drainEvent) { 259 DPRINTF(Drain, "DmaPort done draining, processing drain event\n"); 260 drainEvent->process(); 261 drainEvent = NULL; 262 } 263 264 } else 265 panic("Unknown memory command state."); 266} 267 268DmaDevice::~DmaDevice() 269{ 270} 271 272MasterPort & 273DmaDevice::getMasterPort(const std::string &if_name, int idx) 274{ 275 if (if_name == "dma") { 276 return dmaPort; 277 } 278 return PioDevice::getMasterPort(if_name, idx); 279} 280