X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fdev%2Fio_device.cc;h=cdba171a6017d21b9f9a255e9f511f4a65c47c1d;hb=eac5eac67ae8076e934d78063a24eeef08f25413;hp=660efabfde71cf13e205c9624548a213c58d9f52;hpb=efc06d0545912f4589e86fe32deac98805786ee6;p=gem5.git diff --git a/src/dev/io_device.cc b/src/dev/io_device.cc index 660efabfd..cdba171a6 100644 --- a/src/dev/io_device.cc +++ b/src/dev/io_device.cc @@ -29,102 +29,34 @@ * 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) - : Port(dev->name() + pname), device(dev), sys(s), - outTiming(0), drainEvent(NULL) + : SimpleTimingPort(dev->name() + pname, dev), device(dev) { } Tick -PioPort::recvAtomic(Packet *pkt) +PioPort::recvAtomic(PacketPtr pkt) { - return device->recvAtomic(pkt); + return pkt->isRead() ? device->read(pkt) : device->write(pkt); } void -PioPort::recvFunctional(Packet *pkt) +PioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop) { - device->recvAtomic(pkt); -} - -void -PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) -{ - snoop.clear(); + snoop = false; device->addressRanges(resp); } -void -PioPort::recvRetry() -{ - bool result = true; - while (result && transmitList.size()) { - result = Port::sendTiming(transmitList.front()); - if (result) - transmitList.pop_front(); - } - if (transmitList.size() == 0 && drainEvent) { - drainEvent->process(); - drainEvent = NULL; - } -} - -void -PioPort::SendEvent::process() -{ - port->outTiming--; - assert(port->outTiming >= 0); - if (port->Port::sendTiming(packet)) - if (port->transmitList.size() == 0 && port->drainEvent) { - port->drainEvent->process(); - port->drainEvent = NULL; - } - return; - - port->transmitList.push_back(packet); -} - -void -PioPort::resendNacked(Packet *pkt) { - pkt->reinitNacked(); - if (transmitList.size()) { - transmitList.push_front(pkt); - } else { - if (!Port::sendTiming(pkt)) - transmitList.push_front(pkt); - } -}; - - -bool -PioPort::recvTiming(Packet *pkt) -{ - if (pkt->result == Packet::Nacked) { - resendNacked(pkt); - } else { - Tick latency = device->recvAtomic(pkt); - // turn packet around to go back to requester - pkt->makeTimingResponse(); - sendTiming(pkt, latency); - } - return true; -} - -unsigned int -PioPort::drain(Event *de) -{ - if (outTiming == 0 && transmitList.size() == 0) - return 0; - drainEvent = de; - return 1; -} +PioDevice::PioDevice(const Params *p) + : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL) +{} PioDevice::~PioDevice() { @@ -153,6 +85,11 @@ PioDevice::drain(Event *de) return count; } +BasicPioDevice::BasicPioDevice(const Params *p) + : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), + pioDelay(p->pio_latency) +{} + void BasicPioDevice::addressRanges(AddrRangeList &range_list) { @@ -163,24 +100,35 @@ BasicPioDevice::addressRanges(AddrRangeList &range_list) DmaPort::DmaPort(DmaDevice *dev, System *s) - : Port(dev->name() + "-dmaport"), device(dev), sys(s), pendingCount(0), - actionInProgress(0), drainEvent(NULL) + : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), + pendingCount(0), actionInProgress(0), drainEvent(NULL), + backoffTime(0), inRetry(false), backoffEvent(this) { } bool -DmaPort::recvTiming(Packet *pkt) +DmaPort::recvTiming(PacketPtr pkt) { + if (pkt->wasNacked()) { + DPRINTF(DMA, "Received nacked %s addr %#x\n", + pkt->cmdString(), pkt->getAddr()); + + if (backoffTime < device->minBackoffDelay) + backoffTime = device->minBackoffDelay; + else if (backoffTime < device->maxBackoffDelay) + backoffTime <<= 1; + + reschedule(backoffEvent, curTick + backoffTime, true); + DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); - 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); + queueDma(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()); + backoffTime >>= 2; + + DPRINTF(DMA, "Received response %s addr %#x size %#x\n", + pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); state = dynamic_cast(pkt->senderState); pendingCount--; @@ -188,8 +136,12 @@ DmaPort::recvTiming(Packet *pkt) assert(state); state->numBytes += pkt->req->getSize(); + assert(state->totBytes >= state->numBytes); if (state->totBytes == state->numBytes) { - state->completionEvent->process(); + if (state->delay) + schedule(state->completionEvent, curTick + state->delay); + else + state->completionEvent->process(); delete state; } delete pkt->req; @@ -206,8 +158,9 @@ DmaPort::recvTiming(Packet *pkt) return true; } -DmaDevice::DmaDevice(Params *p) - : PioDevice(p), dmaPort(NULL) +DmaDevice::DmaDevice(const Params *p) + : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay), + maxBackoffDelay(p->max_backoff_delay) { } @@ -236,36 +189,51 @@ DmaPort::drain(Event *de) void DmaPort::recvRetry() { - Packet* pkt = transmitList.front(); + assert(transmitList.size()); bool result = true; - while (result && transmitList.size()) { - DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", - pkt, pkt->senderState); + do { + PacketPtr pkt = transmitList.front(); + DPRINTF(DMA, "Retry on %s addr %#x\n", + pkt->cmdString(), pkt->getAddr()); result = sendTiming(pkt); if (result) { DPRINTF(DMA, "-- Done\n"); transmitList.pop_front(); + inRetry = false; } else { + inRetry = true; DPRINTF(DMA, "-- Failed, queued\n"); } + } while (!backoffTime && result && transmitList.size()); + + if (transmitList.size() && backoffTime && !inRetry) { + DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime); + if (!backoffEvent.scheduled()) + schedule(backoffEvent, backoffTime + curTick); } + DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", + transmitList.size(), backoffTime, inRetry, + backoffEvent.scheduled()); } void DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, - uint8_t *data) + uint8_t *data, Tick delay) { assert(event); assert(device->getState() == SimObject::Running); - DmaReqState *reqState = new DmaReqState(event, this, size); + DmaReqState *reqState = new DmaReqState(event, this, size, delay); + + DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, + event->scheduled()); 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); + PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); // Increment the data pointer on a write if (data) @@ -275,42 +243,81 @@ DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, assert(pendingCount >= 0); pendingCount++; - sendDma(pkt); + DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), + gen.size()); + queueDma(pkt); } } +void +DmaPort::queueDma(PacketPtr pkt, bool front) +{ + + if (front) + transmitList.push_front(pkt); + else + transmitList.push_back(pkt); + sendDma(); +} + void -DmaPort::sendDma(Packet *pkt, bool front) +DmaPort::sendDma() { // some kind of selction between access methods // more work is going to have to be done to make // switching actually work + assert(transmitList.size()); + PacketPtr pkt = transmitList.front(); + + Enums::MemoryMode state = sys->getMemoryMode(); + if (state == Enums::timing) { + if (backoffEvent.scheduled() || inRetry) { + DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); + return; + } - 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"); + DPRINTF(DMA, "Attempting to send %s addr %#x\n", + pkt->cmdString(), pkt->getAddr()); + + bool result; + do { + result = sendTiming(pkt); + if (result) { + transmitList.pop_front(); + DPRINTF(DMA, "-- Done\n"); + } else { + inRetry = true; + DPRINTF(DMA, "-- Failed: queued\n"); + } + } while (result && !backoffTime && transmitList.size()); + + if (transmitList.size() && backoffTime && !inRetry && + !backoffEvent.scheduled()) { + DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", + backoffTime+curTick); + schedule(backoffEvent, backoffTime + curTick); } - } else if (state == System::Atomic) { + } else if (state == Enums::atomic) { + transmitList.pop_front(); + Tick lat; + DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", + pkt->req->getPaddr(), pkt->req->getSize()); lat = sendAtomic(pkt); assert(pkt->senderState); DmaReqState *state = dynamic_cast(pkt->senderState); assert(state); - state->numBytes += pkt->req->getSize(); + + DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", + pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, + state->totBytes, state->completionEvent->scheduled()); + if (state->totBytes == state->numBytes) { - state->completionEvent->schedule(curTick + lat); + assert(!state->completionEvent->scheduled()); + schedule(state->completionEvent, curTick + lat + state->delay); delete state; delete pkt->req; } @@ -332,5 +339,3 @@ DmaDevice::~DmaDevice() if (dmaPort) delete dmaPort; } - -