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Diffstat (limited to 'src/dev/io_device.cc')
| -rw-r--r-- | src/dev/io_device.cc | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/dev/io_device.cc b/src/dev/io_device.cc new file mode 100644 index 000000000..408d8de3e --- /dev/null +++ b/src/dev/io_device.cc @@ -0,0 +1,265 @@ +/* + * Copyright (c) 2006 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Ali Saidi + * Nathan Binkert + */ + +#include "base/chunk_generator.hh" +#include "base/trace.hh" +#include "dev/io_device.hh" +#include "sim/builder.hh" +#include "sim/system.hh" + + +PioPort::PioPort(PioDevice *dev, System *s, std::string pname) + : SimpleTimingPort(dev->name() + pname), device(dev) +{ } + + +Tick +PioPort::recvAtomic(Packet *pkt) +{ + return pkt->isRead() ? device->read(pkt) : device->write(pkt); +} + +void +PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) +{ + snoop.clear(); + device->addressRanges(resp); +} + + +PioDevice::~PioDevice() +{ + if (pioPort) + delete pioPort; +} + +void +PioDevice::init() +{ + if (!pioPort) + panic("Pio port not connected to anything!"); + pioPort->sendStatusChange(Port::RangeChange); +} + + +unsigned int +PioDevice::drain(Event *de) +{ + unsigned int count; + count = pioPort->drain(de); + if (count) + changeState(Draining); + else + changeState(Drained); + return count; +} + +void +BasicPioDevice::addressRanges(AddrRangeList &range_list) +{ + assert(pioSize != 0); + range_list.clear(); + range_list.push_back(RangeSize(pioAddr, pioSize)); +} + + +DmaPort::DmaPort(DmaDevice *dev, System *s) + : Port(dev->name() + "-dmaport"), device(dev), sys(s), pendingCount(0), + actionInProgress(0), drainEvent(NULL) +{ } + +bool +DmaPort::recvTiming(Packet *pkt) +{ + + + if (pkt->result == Packet::Nacked) { + DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n", + pkt, pkt->senderState, pkt->getAddr()); + pkt->reinitNacked(); + sendDma(pkt, true); + } else if (pkt->senderState) { + DmaReqState *state; + DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n", + pkt, pkt->senderState, pkt->getAddr()); + state = dynamic_cast<DmaReqState*>(pkt->senderState); + pendingCount--; + + assert(pendingCount >= 0); + assert(state); + + state->numBytes += pkt->req->getSize(); + if (state->totBytes == state->numBytes) { + state->completionEvent->process(); + delete state; + } + delete pkt->req; + delete pkt; + + if (pendingCount == 0 && drainEvent) { + drainEvent->process(); + drainEvent = NULL; + } + } else { + panic("Got packet without sender state... huh?\n"); + } + + return true; +} + +DmaDevice::DmaDevice(Params *p) + : PioDevice(p), dmaPort(NULL) +{ } + + +unsigned int +DmaDevice::drain(Event *de) +{ + unsigned int count; + count = pioPort->drain(de) + dmaPort->drain(de); + if (count) + changeState(Draining); + else + changeState(Drained); + return count; +} + +unsigned int +DmaPort::drain(Event *de) +{ + if (pendingCount == 0) + return 0; + drainEvent = de; + return 1; +} + + +void +DmaPort::recvRetry() +{ + Packet* pkt = transmitList.front(); + bool result = true; + while (result && transmitList.size()) { + DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", + pkt, pkt->senderState); + result = sendTiming(pkt); + if (result) { + DPRINTF(DMA, "-- Done\n"); + transmitList.pop_front(); + } else { + DPRINTF(DMA, "-- Failed, queued\n"); + } + } +} + + +void +DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, + uint8_t *data) +{ + assert(event); + + assert(device->getState() == SimObject::Running); + + DmaReqState *reqState = new DmaReqState(event, this, size); + + for (ChunkGenerator gen(addr, size, peerBlockSize()); + !gen.done(); gen.next()) { + Request *req = new Request(gen.addr(), gen.size(), 0); + Packet *pkt = new Packet(req, cmd, Packet::Broadcast); + + // Increment the data pointer on a write + if (data) + pkt->dataStatic(data + gen.complete()); + + pkt->senderState = reqState; + + assert(pendingCount >= 0); + pendingCount++; + sendDma(pkt); + } + +} + + +void +DmaPort::sendDma(Packet *pkt, bool front) +{ + // some kind of selction between access methods + // more work is going to have to be done to make + // switching actually work + + System::MemoryMode state = sys->getMemoryMode(); + if (state == System::Timing) { + DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n", + pkt, pkt->getAddr()); + if (transmitList.size() || !sendTiming(pkt)) { + if (front) + transmitList.push_front(pkt); + else + transmitList.push_back(pkt); + DPRINTF(DMA, "-- Failed: queued\n"); + } else { + DPRINTF(DMA, "-- Done\n"); + } + } else if (state == System::Atomic) { + Tick lat; + lat = sendAtomic(pkt); + assert(pkt->senderState); + DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); + assert(state); + + state->numBytes += pkt->req->getSize(); + if (state->totBytes == state->numBytes) { + state->completionEvent->schedule(curTick + lat); + delete state; + delete pkt->req; + } + pendingCount--; + assert(pendingCount >= 0); + delete pkt; + + if (pendingCount == 0 && drainEvent) { + drainEvent->process(); + drainEvent = NULL; + } + + } else + panic("Unknown memory command state."); +} + +DmaDevice::~DmaDevice() +{ + if (dmaPort) + delete dmaPort; +} + + |