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-rw-r--r--src/arch/sparc/process.cc1
-rw-r--r--src/arch/x86/process.cc1
-rw-r--r--src/cpu/simple/timing.cc24
-rw-r--r--src/cpu/thread_state.cc5
-rw-r--r--src/dev/i8254xGBe.cc6
-rw-r--r--src/dev/ide_ctrl.cc6
-rw-r--r--src/dev/io_device.cc90
-rw-r--r--src/dev/io_device.hh25
-rw-r--r--src/dev/ns_gige.cc6
-rw-r--r--src/dev/pcidev.hh2
-rw-r--r--src/dev/sinic.cc6
-rw-r--r--src/mem/bridge.cc189
-rw-r--r--src/mem/bridge.hh57
-rw-r--r--src/mem/cache/cache_impl.hh8
-rw-r--r--src/mem/tport.cc1
-rw-r--r--src/mem/translating_port.cc17
-rw-r--r--src/mem/translating_port.hh13
-rw-r--r--src/sim/faults.cc17
-rw-r--r--src/sim/process.cc27
-rw-r--r--src/sim/process.hh27
-rw-r--r--src/sim/process_impl.hh75
21 files changed, 471 insertions, 132 deletions
diff --git a/src/arch/sparc/process.cc b/src/arch/sparc/process.cc
index e4774ab54..d595664a0 100644
--- a/src/arch/sparc/process.cc
+++ b/src/arch/sparc/process.cc
@@ -39,6 +39,7 @@
#include "base/misc.hh"
#include "cpu/thread_context.hh"
#include "mem/page_table.hh"
+#include "sim/process_impl.hh"
#include "mem/translating_port.hh"
#include "sim/system.hh"
diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc
index e6d1e4921..af7494598 100644
--- a/src/arch/x86/process.cc
+++ b/src/arch/x86/process.cc
@@ -95,6 +95,7 @@
#include "cpu/thread_context.hh"
#include "mem/page_table.hh"
#include "mem/translating_port.hh"
+#include "sim/process_impl.hh"
#include "sim/system.hh"
using namespace std;
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc
index 45da7c3eb..fa7bb4f86 100644
--- a/src/cpu/simple/timing.cc
+++ b/src/cpu/simple/timing.cc
@@ -574,10 +574,16 @@ TimingSimpleCPU::IcachePort::recvTiming(PacketPtr pkt)
return true;
}
- else {
- //Snooping a Coherence Request, do nothing
- return true;
+ else if (pkt->result == Packet::Nacked) {
+ assert(cpu->_status == IcacheWaitResponse);
+ pkt->reinitNacked();
+ if (!sendTiming(pkt)) {
+ cpu->_status = IcacheRetry;
+ cpu->ifetch_pkt = pkt;
+ }
}
+ //Snooping a Coherence Request, do nothing
+ return true;
}
void
@@ -663,10 +669,16 @@ TimingSimpleCPU::DcachePort::recvTiming(PacketPtr pkt)
return true;
}
- else {
- //Snooping a coherence req, do nothing
- return true;
+ else if (pkt->result == Packet::Nacked) {
+ assert(cpu->_status == DcacheWaitResponse);
+ pkt->reinitNacked();
+ if (!sendTiming(pkt)) {
+ cpu->_status = DcacheRetry;
+ cpu->dcache_pkt = pkt;
+ }
}
+ //Snooping a Coherence Request, do nothing
+ return true;
}
void
diff --git a/src/cpu/thread_state.cc b/src/cpu/thread_state.cc
index 4b65ca4b8..be8f822f2 100644
--- a/src/cpu/thread_state.cc
+++ b/src/cpu/thread_state.cc
@@ -169,9 +169,8 @@ ThreadState::getMemPort()
return port;
/* Use this port to for syscall emulation writes to memory. */
- port = new TranslatingPort(csprintf("%s-%d-funcport",
- baseCpu->name(), tid),
- process->pTable, false);
+ port = new TranslatingPort(csprintf("%s-%d-funcport", baseCpu->name(), tid),
+ process, TranslatingPort::NextPage);
connectToMemFunc(port);
diff --git a/src/dev/i8254xGBe.cc b/src/dev/i8254xGBe.cc
index 6acd06132..e54249dee 100644
--- a/src/dev/i8254xGBe.cc
+++ b/src/dev/i8254xGBe.cc
@@ -1460,6 +1460,8 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(IGbE)
SimObjectParam<System *> system;
SimObjectParam<Platform *> platform;
+ Param<Tick> min_backoff_delay;
+ Param<Tick> max_backoff_delay;
SimObjectParam<PciConfigData *> configdata;
Param<uint32_t> pci_bus;
Param<uint32_t> pci_dev;
@@ -1481,6 +1483,8 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(IGbE)
INIT_PARAM(system, "System pointer"),
INIT_PARAM(platform, "Platform pointer"),
+ INIT_PARAM(min_backoff_delay, "Minimum delay after receving a nack packed"),
+ INIT_PARAM(max_backoff_delay, "Maximum delay after receving a nack packed"),
INIT_PARAM(configdata, "PCI Config data"),
INIT_PARAM(pci_bus, "PCI bus ID"),
INIT_PARAM(pci_dev, "PCI device number"),
@@ -1505,6 +1509,8 @@ CREATE_SIM_OBJECT(IGbE)
params->name = getInstanceName();
params->platform = platform;
params->system = system;
+ params->min_backoff_delay = min_backoff_delay;
+ params->max_backoff_delay = max_backoff_delay;
params->configData = configdata;
params->busNum = pci_bus;
params->deviceNum = pci_dev;
diff --git a/src/dev/ide_ctrl.cc b/src/dev/ide_ctrl.cc
index 1afad529f..921ba1cd0 100644
--- a/src/dev/ide_ctrl.cc
+++ b/src/dev/ide_ctrl.cc
@@ -751,6 +751,8 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(IdeController)
SimObjectParam<System *> system;
SimObjectParam<Platform *> platform;
+ Param<Tick> min_backoff_delay;
+ Param<Tick> max_backoff_delay;
SimObjectParam<PciConfigData *> configdata;
Param<uint32_t> pci_bus;
Param<uint32_t> pci_dev;
@@ -765,6 +767,8 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(IdeController)
INIT_PARAM(system, "System pointer"),
INIT_PARAM(platform, "Platform pointer"),
+ INIT_PARAM(min_backoff_delay, "Minimum delay after receving a nack packed"),
+ INIT_PARAM(max_backoff_delay, "Maximum delay after receving a nack packed"),
INIT_PARAM(configdata, "PCI Config data"),
INIT_PARAM(pci_bus, "PCI bus ID"),
INIT_PARAM(pci_dev, "PCI device number"),
@@ -781,6 +785,8 @@ CREATE_SIM_OBJECT(IdeController)
params->name = getInstanceName();
params->platform = platform;
params->system = system;
+ params->min_backoff_delay = min_backoff_delay;
+ params->max_backoff_delay = max_backoff_delay;
params->configData = configdata;
params->busNum = pci_bus;
params->deviceNum = pci_dev;
diff --git a/src/dev/io_device.cc b/src/dev/io_device.cc
index a1285fefc..9384c4b92 100644
--- a/src/dev/io_device.cc
+++ b/src/dev/io_device.cc
@@ -93,7 +93,8 @@ BasicPioDevice::addressRanges(AddrRangeList &range_list)
DmaPort::DmaPort(DmaDevice *dev, System *s)
: Port(dev->name() + "-dmaport", dev), device(dev), sys(s),
- pendingCount(0), actionInProgress(0), drainEvent(NULL)
+ pendingCount(0), actionInProgress(0), drainEvent(NULL),
+ backoffTime(0), inRetry(false), backoffEvent(this)
{ }
bool
@@ -104,12 +105,27 @@ DmaPort::recvTiming(PacketPtr pkt)
if (pkt->result == Packet::Nacked) {
DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
pkt, pkt->senderState, pkt->getAddr());
+
+ if (backoffTime < device->minBackoffDelay)
+ backoffTime = device->minBackoffDelay;
+ else if (backoffTime < device->maxBackoffDelay)
+ backoffTime <<= 1;
+
+ if (backoffEvent.scheduled())
+ backoffEvent.reschedule(curTick + backoffTime);
+ else
+ backoffEvent.schedule(curTick + backoffTime);
+
+ DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
+
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 Pkt %#x with State: %#x Addr: %#x size: %#x\n",
+ pkt, pkt->senderState, pkt->getAddr(), pkt->req->getSize());
state = dynamic_cast<DmaReqState*>(pkt->senderState);
pendingCount--;
@@ -117,6 +133,7 @@ DmaPort::recvTiming(PacketPtr pkt)
assert(state);
state->numBytes += pkt->req->getSize();
+ assert(state->totBytes >= state->numBytes);
if (state->totBytes == state->numBytes) {
state->completionEvent->process();
delete state;
@@ -136,7 +153,8 @@ DmaPort::recvTiming(PacketPtr pkt)
}
DmaDevice::DmaDevice(Params *p)
- : PioDevice(p), dmaPort(NULL)
+ : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay),
+ maxBackoffDelay(p->max_backoff_delay)
{ }
@@ -165,19 +183,31 @@ DmaPort::drain(Event *de)
void
DmaPort::recvRetry()
{
+ assert(transmitList.size());
PacketPtr pkt = transmitList.front();
bool result = true;
- while (result && transmitList.size()) {
+ do {
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();
+ 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())
+ backoffEvent.schedule(backoffTime+curTick);
}
+ DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n",
+ transmitList.size(), backoffTime, inRetry,
+ backoffEvent.scheduled());
}
@@ -204,33 +234,61 @@ DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
assert(pendingCount >= 0);
pendingCount++;
- sendDma(pkt);
+ queueDma(pkt);
}
}
+void
+DmaPort::queueDma(PacketPtr pkt, bool front)
+{
+
+ if (front)
+ transmitList.push_front(pkt);
+ else
+ transmitList.push_back(pkt);
+ sendDma();
+}
+
void
-DmaPort::sendDma(PacketPtr 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();
System::MemoryMode state = sys->getMemoryMode();
if (state == System::Timing) {
+ if (backoffEvent.scheduled() || inRetry) {
+ DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n");
+ return;
+ }
+
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");
+
+ 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()) {
+ backoffEvent.schedule(backoffTime+curTick);
}
} else if (state == System::Atomic) {
+ transmitList.pop_front();
+
Tick lat;
lat = sendAtomic(pkt);
assert(pkt->senderState);
diff --git a/src/dev/io_device.hh b/src/dev/io_device.hh
index cd7a5296a..bd150bfe4 100644
--- a/src/dev/io_device.hh
+++ b/src/dev/io_device.hh
@@ -107,6 +107,14 @@ class DmaPort : public Port
* here.*/
Event *drainEvent;
+ /** time to wait between sending another packet, increases as NACKs are
+ * recived, decreases as responses are recived. */
+ Tick backoffTime;
+
+ /** If the port is currently waiting for a retry before it can send whatever
+ * it is that it's sending. */
+ bool inRetry;
+
virtual bool recvTiming(PacketPtr pkt);
virtual Tick recvAtomic(PacketPtr pkt)
{ panic("dma port shouldn't be used for pio access."); M5_DUMMY_RETURN }
@@ -122,7 +130,11 @@ class DmaPort : public Port
AddrRangeList &snoop)
{ resp.clear(); snoop.clear(); }
- void sendDma(PacketPtr pkt, bool front = false);
+ void queueDma(PacketPtr pkt, bool front = false);
+ void sendDma();
+
+ /** event to give us a kick every time we backoff time is reached. */
+ EventWrapper<DmaPort, &DmaPort::sendDma> backoffEvent;
public:
DmaPort(DmaDevice *dev, System *s);
@@ -249,8 +261,17 @@ class BasicPioDevice : public PioDevice
class DmaDevice : public PioDevice
{
- protected:
+ public:
+ struct Params : public PioDevice::Params
+ {
+ Tick min_backoff_delay;
+ Tick max_backoff_delay;
+ };
+
+ protected:
DmaPort *dmaPort;
+ Tick minBackoffDelay;
+ Tick maxBackoffDelay;
public:
DmaDevice(Params *p);
diff --git a/src/dev/ns_gige.cc b/src/dev/ns_gige.cc
index 86f56b62e..bec1fb848 100644
--- a/src/dev/ns_gige.cc
+++ b/src/dev/ns_gige.cc
@@ -2812,6 +2812,8 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(NSGigE)
SimObjectParam<System *> system;
SimObjectParam<Platform *> platform;
+ Param<Tick> min_backoff_delay;
+ Param<Tick> max_backoff_delay;
SimObjectParam<PciConfigData *> configdata;
Param<uint32_t> pci_bus;
Param<uint32_t> pci_dev;
@@ -2846,6 +2848,8 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(NSGigE)
INIT_PARAM(system, "System pointer"),
INIT_PARAM(platform, "Platform pointer"),
+ INIT_PARAM(min_backoff_delay, "Minimum delay after receving a nack packed"),
+ INIT_PARAM(max_backoff_delay, "Maximum delay after receving a nack packed"),
INIT_PARAM(configdata, "PCI Config data"),
INIT_PARAM(pci_bus, "PCI bus ID"),
INIT_PARAM(pci_dev, "PCI device number"),
@@ -2884,6 +2888,8 @@ CREATE_SIM_OBJECT(NSGigE)
params->name = getInstanceName();
params->platform = platform;
params->system = system;
+ params->min_backoff_delay = min_backoff_delay;
+ params->max_backoff_delay = max_backoff_delay;
params->configData = configdata;
params->busNum = pci_bus;
params->deviceNum = pci_dev;
diff --git a/src/dev/pcidev.hh b/src/dev/pcidev.hh
index 56e3ffb4a..5044e2932 100644
--- a/src/dev/pcidev.hh
+++ b/src/dev/pcidev.hh
@@ -105,7 +105,7 @@ class PciDev : public DmaDevice
};
public:
- struct Params : public PioDevice::Params
+ struct Params : public DmaDevice::Params
{
/**
* A pointer to the object that contains the first 64 bytes of
diff --git a/src/dev/sinic.cc b/src/dev/sinic.cc
index f61c161aa..1a72652da 100644
--- a/src/dev/sinic.cc
+++ b/src/dev/sinic.cc
@@ -1635,6 +1635,8 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS_WNS(Sinic, SinicDevice)
SimObjectParam<System *> system;
SimObjectParam<Platform *> platform;
+ Param<Tick> min_backoff_delay;
+ Param<Tick> max_backoff_delay;
SimObjectParam<PciConfigData *> configdata;
Param<uint32_t> pci_bus;
Param<uint32_t> pci_dev;
@@ -1678,6 +1680,8 @@ BEGIN_INIT_SIM_OBJECT_PARAMS_WNS(Sinic, SinicDevice)
INIT_PARAM(system, "System pointer"),
INIT_PARAM(platform, "Platform pointer"),
+ INIT_PARAM(min_backoff_delay, "Minimum delay after receving a nack packed"),
+ INIT_PARAM(max_backoff_delay, "Maximum delay after receving a nack packed"),
INIT_PARAM(configdata, "PCI Config data"),
INIT_PARAM(pci_bus, "PCI bus ID"),
INIT_PARAM(pci_dev, "PCI device number"),
@@ -1723,6 +1727,8 @@ CREATE_SIM_OBJECT_WNS(Sinic, SinicDevice)
params->name = getInstanceName();
params->platform = platform;
params->system = system;
+ params->min_backoff_delay = min_backoff_delay;
+ params->max_backoff_delay = max_backoff_delay;
params->configData = configdata;
params->busNum = pci_bus;
params->deviceNum = pci_dev;
diff --git a/src/mem/bridge.cc b/src/mem/bridge.cc
index b25d135e2..e89473be3 100644
--- a/src/mem/bridge.cc
+++ b/src/mem/bridge.cc
@@ -43,21 +43,22 @@
Bridge::BridgePort::BridgePort(const std::string &_name,
Bridge *_bridge, BridgePort *_otherPort,
- int _delay, int _queueLimit,
- bool fix_partial_write)
+ int _delay, int _nack_delay, int _req_limit,
+ int _resp_limit, bool fix_partial_write)
: Port(_name), bridge(_bridge), otherPort(_otherPort),
- delay(_delay), fixPartialWrite(fix_partial_write),
- outstandingResponses(0), queueLimit(_queueLimit), sendEvent(this)
+ delay(_delay), nackDelay(_nack_delay), fixPartialWrite(fix_partial_write),
+ outstandingResponses(0), queuedRequests(0), inRetry(false),
+ reqQueueLimit(_req_limit), respQueueLimit(_resp_limit), sendEvent(this)
{
}
-Bridge::Bridge(const std::string &n, int qsa, int qsb,
- Tick _delay, int write_ack, bool fix_partial_write_a,
- bool fix_partial_write_b)
- : MemObject(n),
- portA(n + "-portA", this, &portB, _delay, qsa, fix_partial_write_a),
- portB(n + "-portB", this, &portA, _delay, qsa, fix_partial_write_b),
- ackWrites(write_ack)
+Bridge::Bridge(Params *p)
+ : MemObject(p->name),
+ portA(p->name + "-portA", this, &portB, p->delay, p->nack_delay,
+ p->req_size_a, p->resp_size_a, p->fix_partial_write_a),
+ portB(p->name + "-portB", this, &portA, p->delay, p->nack_delay,
+ p->req_size_b, p->resp_size_b, p->fix_partial_write_b),
+ ackWrites(p->write_ack), _params(p)
{
if (ackWrites)
panic("No support for acknowledging writes\n");
@@ -92,34 +93,105 @@ Bridge::init()
fatal("Busses don't have the same block size... Not supported.\n");
}
+bool
+Bridge::BridgePort::respQueueFull()
+{
+ assert(outstandingResponses >= 0 && outstandingResponses <= respQueueLimit);
+ return outstandingResponses >= respQueueLimit;
+}
+
+bool
+Bridge::BridgePort::reqQueueFull()
+{
+ assert(queuedRequests >= 0 && queuedRequests <= reqQueueLimit);
+ return queuedRequests >= reqQueueLimit;
+}
/** Function called by the port when the bus is receiving a Timing
* transaction.*/
bool
Bridge::BridgePort::recvTiming(PacketPtr pkt)
{
- if (pkt->flags & SNOOP_COMMIT) {
- DPRINTF(BusBridge, "recvTiming: src %d dest %d addr 0x%x\n",
+ if (!(pkt->flags & SNOOP_COMMIT))
+ return true;
+
+
+ DPRINTF(BusBridge, "recvTiming: src %d dest %d addr 0x%x\n",
pkt->getSrc(), pkt->getDest(), pkt->getAddr());
- return otherPort->queueForSendTiming(pkt);
+ if (pkt->isRequest() && otherPort->reqQueueFull()) {
+ DPRINTF(BusBridge, "Remote queue full, nacking\n");
+ nackRequest(pkt);
+ return true;
+ }
+
+ if (pkt->needsResponse() && pkt->result != Packet::Nacked)
+ if (respQueueFull()) {
+ DPRINTF(BusBridge, "Local queue full, no space for response, nacking\n");
+ DPRINTF(BusBridge, "queue size: %d outreq: %d outstanding resp: %d\n",
+ sendQueue.size(), queuedRequests, outstandingResponses);
+ nackRequest(pkt);
+ return true;
+ } else {
+ DPRINTF(BusBridge, "Request Needs response, reserving space\n");
+ ++outstandingResponses;
+ }
+
+ otherPort->queueForSendTiming(pkt);
+
+ return true;
+}
+
+void
+Bridge::BridgePort::nackRequest(PacketPtr pkt)
+{
+ // Nack the packet
+ pkt->result = Packet::Nacked;
+ pkt->setDest(pkt->getSrc());
+
+ //put it on the list to send
+ Tick readyTime = curTick + nackDelay;
+ PacketBuffer *buf = new PacketBuffer(pkt, readyTime, true);
+
+ // nothing on the list, add it and we're done
+ if (sendQueue.empty()) {
+ assert(!sendEvent.scheduled());
+ sendEvent.schedule(readyTime);
+ sendQueue.push_back(buf);
+ return;
+ }
+
+ assert(sendEvent.scheduled() || inRetry);
+
+ // does it go at the end?
+ if (readyTime >= sendQueue.back()->ready) {
+ sendQueue.push_back(buf);
+ return;
}
- else {
- // Else it's just a snoop, properly return if we are blocking
- return !queueFull();
+
+ // ok, somewhere in the middle, fun
+ std::list<PacketBuffer*>::iterator i = sendQueue.begin();
+ std::list<PacketBuffer*>::iterator end = sendQueue.end();
+ std::list<PacketBuffer*>::iterator begin = sendQueue.begin();
+ bool done = false;
+
+ while (i != end && !done) {
+ if (readyTime < (*i)->ready) {
+ if (i == begin)
+ sendEvent.reschedule(readyTime);
+ sendQueue.insert(i,buf);
+ done = true;
+ }
+ i++;
}
+ assert(done);
}
-bool
+void
Bridge::BridgePort::queueForSendTiming(PacketPtr pkt)
{
- if (queueFull()) {
- DPRINTF(BusBridge, "Queue full, returning false\n");
- return false;
- }
-
- if (pkt->isResponse()) {
+ if (pkt->isResponse() || pkt->result == Packet::Nacked) {
// This is a response for a request we forwarded earlier. The
// corresponding PacketBuffer should be stored in the packet's
// senderState field.
@@ -128,6 +200,13 @@ Bridge::BridgePort::queueForSendTiming(PacketPtr pkt)
// set up new packet dest & senderState based on values saved
// from original request
buf->fixResponse(pkt);
+
+ // Check if this packet was expecting a response (this is either it or
+ // its a nacked packet and we won't be seeing that response)
+ if (buf->expectResponse)
+ --outstandingResponses;
+
+
DPRINTF(BusBridge, "restoring sender state: %#X, from packet buffer: %#X\n",
pkt->senderState, buf);
DPRINTF(BusBridge, " is response, new dest %d\n", pkt->getDest());
@@ -146,10 +225,8 @@ Bridge::BridgePort::queueForSendTiming(PacketPtr pkt)
if (sendQueue.empty()) {
sendEvent.schedule(readyTime);
}
-
+ ++queuedRequests;
sendQueue.push_back(buf);
-
- return true;
}
void
@@ -157,7 +234,6 @@ Bridge::BridgePort::trySend()
{
assert(!sendQueue.empty());
- bool was_full = queueFull();
int pbs = peerBlockSize();
PacketBuffer *buf = sendQueue.front();
@@ -169,7 +245,8 @@ Bridge::BridgePort::trySend()
pkt->flags &= ~SNOOP_COMMIT; //CLear it if it was set
if (pkt->cmd == MemCmd::WriteInvalidateReq && fixPartialWrite &&
- pkt->getOffset(pbs) && pkt->getSize() != pbs) {
+ pkt->result != Packet::Nacked && pkt->getOffset(pbs) &&
+ pkt->getSize() != pbs) {
buf->partialWriteFix(this);
pkt = buf->pkt;
}
@@ -184,10 +261,7 @@ Bridge::BridgePort::trySend()
buf->pkt = NULL; // we no longer own packet, so it's not safe to look at it
if (buf->expectResponse) {
- // Must wait for response. We just need to count outstanding
- // responses (in case we want to cap them); PacketBuffer
- // pointer will be recovered on response.
- ++outstandingResponses;
+ // Must wait for response
DPRINTF(BusBridge, " successful: awaiting response (%d)\n",
outstandingResponses);
} else {
@@ -196,28 +270,34 @@ Bridge::BridgePort::trySend()
delete buf;
}
+ if (!buf->nacked)
+ --queuedRequests;
+
// If there are more packets to send, schedule event to try again.
if (!sendQueue.empty()) {
buf = sendQueue.front();
+ DPRINTF(BusBridge, "Scheduling next send\n");
sendEvent.schedule(std::max(buf->ready, curTick + 1));
}
- // Let things start sending again
- if (was_full) {
- DPRINTF(BusBridge, "Queue was full, sending retry\n");
- otherPort->sendRetry();
- }
-
} else {
DPRINTF(BusBridge, " unsuccessful\n");
buf->undoPartialWriteFix();
+ inRetry = true;
}
+ DPRINTF(BusBridge, "trySend: queue size: %d outreq: %d outstanding resp: %d\n",
+ sendQueue.size(), queuedRequests, outstandingResponses);
}
void
Bridge::BridgePort::recvRetry()
{
- trySend();
+ inRetry = false;
+ Tick nextReady = sendQueue.front()->ready;
+ if (nextReady <= curTick)
+ trySend();
+ else
+ sendEvent.schedule(nextReady);
}
/** Function called by the port when the bus is receiving a Atomic
@@ -263,9 +343,12 @@ Bridge::BridgePort::getDeviceAddressRanges(AddrRangeList &resp,
BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bridge)
- Param<int> queue_size_a;
- Param<int> queue_size_b;
+ Param<int> req_size_a;
+ Param<int> req_size_b;
+ Param<int> resp_size_a;
+ Param<int> resp_size_b;
Param<Tick> delay;
+ Param<Tick> nack_delay;
Param<bool> write_ack;
Param<bool> fix_partial_write_a;
Param<bool> fix_partial_write_b;
@@ -274,9 +357,12 @@ END_DECLARE_SIM_OBJECT_PARAMS(Bridge)
BEGIN_INIT_SIM_OBJECT_PARAMS(Bridge)
- INIT_PARAM(queue_size_a, "The size of the queue for data coming into side a"),
- INIT_PARAM(queue_size_b, "The size of the queue for data coming into side b"),
+ INIT_PARAM(req_size_a, "The size of the queue for requests coming into side a"),
+ INIT_PARAM(req_size_b, "The size of the queue for requests coming into side b"),
+ INIT_PARAM(resp_size_a, "The size of the queue for responses coming into side a"),
+ INIT_PARAM(resp_size_b, "The size of the queue for responses coming into side b"),
INIT_PARAM(delay, "The miminum delay to cross this bridge"),
+ INIT_PARAM(nack_delay, "The minimum delay to nack a packet"),
INIT_PARAM(write_ack, "Acknowledge any writes that are received."),
INIT_PARAM(fix_partial_write_a, "Fixup any partial block writes that are received"),
INIT_PARAM(fix_partial_write_b, "Fixup any partial block writes that are received")
@@ -285,8 +371,19 @@ END_INIT_SIM_OBJECT_PARAMS(Bridge)
CREATE_SIM_OBJECT(Bridge)
{
- return new Bridge(getInstanceName(), queue_size_a, queue_size_b, delay,
- write_ack, fix_partial_write_a, fix_partial_write_b);
+ Bridge::Params *p = new Bridge::Params;
+ p->name = getInstanceName();
+ p->req_size_a = req_size_a;
+ p->req_size_b = req_size_b;
+ p->resp_size_a = resp_size_a;
+ p->resp_size_b = resp_size_b;
+ p->delay = delay;
+ p->nack_delay = nack_delay;
+ p->write_ack = write_ack;
+ p->fix_partial_write_a = fix_partial_write_a;
+ p->fix_partial_write_b = fix_partial_write_b;
+ return new Bridge(p);
}
REGISTER_SIM_OBJECT("Bridge", Bridge)
+
diff --git a/src/mem/bridge.hh b/src/mem/bridge.hh
index d1154eda0..cb5a6baed 100644
--- a/src/mem/bridge.hh
+++ b/src/mem/bridge.hh
@@ -66,6 +66,9 @@ class Bridge : public MemObject
/** Minimum delay though this bridge. */
Tick delay;
+ /** Min delay to respond to a nack. */
+ Tick nackDelay;
+
bool fixPartialWrite;
class PacketBuffer : public Packet::SenderState {
@@ -79,13 +82,16 @@ class Bridge : public MemObject
bool partialWriteFixed;
PacketPtr oldPkt;
+ bool nacked;
- PacketBuffer(PacketPtr _pkt, Tick t)
+ PacketBuffer(PacketPtr _pkt, Tick t, bool nack = false)
: ready(t), pkt(_pkt),
origSenderState(_pkt->senderState), origSrc(_pkt->getSrc()),
- expectResponse(_pkt->needsResponse()), partialWriteFixed(false)
+ expectResponse(_pkt->needsResponse() && !nack),
+ partialWriteFixed(false), nacked(nack)
+
{
- if (!pkt->isResponse())
+ if (!pkt->isResponse() && !nack)
pkt->senderState = this;
}
@@ -144,19 +150,29 @@ class Bridge : public MemObject
std::list<PacketBuffer*> sendQueue;
int outstandingResponses;
+ int queuedRequests;
+
+ /** If we're waiting for a retry to happen.*/
+ bool inRetry;
/** Max queue size for outbound packets */
- int queueLimit;
+ int reqQueueLimit;
+
+ /** Max queue size for reserved responses. */
+ int respQueueLimit;
/**
* Is this side blocked from accepting outbound packets?
*/
- bool queueFull() { return (sendQueue.size() == queueLimit); }
+ bool respQueueFull();
+ bool reqQueueFull();
- bool queueForSendTiming(PacketPtr pkt);
+ void queueForSendTiming(PacketPtr pkt);
void finishSend(PacketBuffer *buf);
+ void nackRequest(PacketPtr pkt);
+
/**
* Handle send event, scheduled when the packet at the head of
* the outbound queue is ready to transmit (for timing
@@ -180,11 +196,10 @@ class Bridge : public MemObject
SendEvent sendEvent;
public:
-
/** Constructor for the BusPort.*/
- BridgePort(const std::string &_name,
- Bridge *_bridge, BridgePort *_otherPort,
- int _delay, int _queueLimit, bool fix_partial_write);
+ BridgePort(const std::string &_name, Bridge *_bridge,
+ BridgePort *_otherPort, int _delay, int _nack_delay,
+ int _req_limit, int _resp_limit, bool fix_partial_write);
protected:
@@ -220,14 +235,32 @@ class Bridge : public MemObject
bool ackWrites;
public:
+ struct Params
+ {
+ std::string name;
+ int req_size_a;
+ int req_size_b;
+ int resp_size_a;
+ int resp_size_b;
+ Tick delay;
+ Tick nack_delay;
+ bool write_ack;
+ bool fix_partial_write_a;
+ bool fix_partial_write_b;
+ };
+
+ protected:
+ Params *_params;
+
+ public:
+ const Params *params() const { return _params; }
/** A function used to return the port associated with this bus object. */
virtual Port *getPort(const std::string &if_name, int idx = -1);
virtual void init();
- Bridge(const std::string &n, int qsa, int qsb, Tick _delay, int write_ack,
- bool fix_partial_write_a, bool fix_partial_write_b);
+ Bridge(Params *p);
};
#endif //__MEM_BUS_HH__
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index 0a528aa5d..c70f10151 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -1192,6 +1192,8 @@ template<class TagStore, class Coherence>
bool
Cache<TagStore,Coherence>::CpuSidePort::recvTiming(PacketPtr pkt)
{
+ assert(pkt->result != Packet::Nacked);
+
if (!pkt->req->isUncacheable()
&& pkt->isInvalidate()
&& !pkt->isRead() && !pkt->isWrite()) {
@@ -1249,6 +1251,12 @@ template<class TagStore, class Coherence>
bool
Cache<TagStore,Coherence>::MemSidePort::recvTiming(PacketPtr pkt)
{
+ // this needs to be fixed so that the cache updates the mshr and sends the
+ // packet back out on the link, but it probably won't happen so until this
+ // gets fixed, just panic when it does
+ if (pkt->result == Packet::Nacked)
+ panic("Need to implement cache resending nacked packets!\n");
+
if (pkt->isRequest() && blocked)
{
DPRINTF(Cache,"Scheduling a retry while blocked\n");
diff --git a/src/mem/tport.cc b/src/mem/tport.cc
index b384a0444..9a4bd7967 100644
--- a/src/mem/tport.cc
+++ b/src/mem/tport.cc
@@ -128,6 +128,7 @@ SimpleTimingPort::sendTiming(PacketPtr pkt, Tick time)
}
i++;
}
+ assert(done);
}
void
diff --git a/src/mem/translating_port.cc b/src/mem/translating_port.cc
index d2c854086..54de6625e 100644
--- a/src/mem/translating_port.cc
+++ b/src/mem/translating_port.cc
@@ -34,12 +34,14 @@
#include "mem/port.hh"
#include "mem/translating_port.hh"
#include "mem/page_table.hh"
+#include "sim/process.hh"
using namespace TheISA;
TranslatingPort::TranslatingPort(const std::string &_name,
- PageTable *p_table, bool alloc)
- : FunctionalPort(_name), pTable(p_table), allocating(alloc)
+ Process *p, AllocType alloc)
+ : FunctionalPort(_name), pTable(p->pTable), process(p),
+ allocating(alloc)
{ }
TranslatingPort::~TranslatingPort()
@@ -81,13 +83,18 @@ TranslatingPort::tryWriteBlob(Addr addr, uint8_t *p, int size)
for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
if (!pTable->translate(gen.addr(), paddr)) {
- if (allocating) {
+ if (allocating == Always) {
pTable->allocate(roundDown(gen.addr(), VMPageSize),
VMPageSize);
- pTable->translate(gen.addr(), paddr);
+ } else if (allocating == NextPage) {
+ // check if we've accessed the next page on the stack
+ if (!process->checkAndAllocNextPage(gen.addr()))
+ panic("Page table fault when accessing virtual address %#x "
+ "during functional write\n", gen.addr());
} else {
return false;
}
+ pTable->translate(gen.addr(), paddr);
}
Port::writeBlob(paddr, p + prevSize, gen.size());
@@ -113,7 +120,7 @@ TranslatingPort::tryMemsetBlob(Addr addr, uint8_t val, int size)
for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
if (!pTable->translate(gen.addr(), paddr)) {
- if (allocating) {
+ if (allocating == Always) {
pTable->allocate(roundDown(gen.addr(), VMPageSize),
VMPageSize);
pTable->translate(gen.addr(), paddr);
diff --git a/src/mem/translating_port.hh b/src/mem/translating_port.hh
index 7354278ba..76c7947be 100644
--- a/src/mem/translating_port.hh
+++ b/src/mem/translating_port.hh
@@ -35,16 +35,25 @@
#include "mem/port.hh"
class PageTable;
+class Process;
class TranslatingPort : public FunctionalPort
{
+ public:
+ enum AllocType {
+ Always,
+ Never,
+ NextPage
+ };
+
private:
PageTable *pTable;
- bool allocating;
+ Process *process;
+ AllocType allocating;
public:
TranslatingPort(const std::string &_name,
- PageTable *p_table, bool alloc = false);
+ Process *p, AllocType alloc);
virtual ~TranslatingPort();
bool tryReadBlob(Addr addr, uint8_t *p, int size);
diff --git a/src/sim/faults.cc b/src/sim/faults.cc
index b09bbc177..fe62874d7 100644
--- a/src/sim/faults.cc
+++ b/src/sim/faults.cc
@@ -61,21 +61,8 @@ void PageTableFault::invoke(ThreadContext *tc)
{
Process *p = tc->getProcessPtr();
- // We've accessed the next page of the stack, so extend the stack
- // to cover it.
- if(vaddr < p->stack_min && vaddr >= p->stack_min - TheISA::PageBytes)
- {
- p->stack_min -= TheISA::PageBytes;
- if(p->stack_base - p->stack_min > 8*1024*1024)
- fatal("Over max stack size for one thread\n");
- p->pTable->allocate(p->stack_min, TheISA::PageBytes);
- warn("Increasing stack size by one page.");
- }
- // Otherwise, we have an unexpected page fault. Report that fact,
- // and what address was accessed to cause the fault.
- else
- {
+ if (!p->checkAndAllocNextPage(vaddr))
panic("Page table fault when accessing virtual address %#x\n", vaddr);
- }
+
}
#endif
diff --git a/src/sim/process.cc b/src/sim/process.cc
index 68239fa52..8b273d591 100644
--- a/src/sim/process.cc
+++ b/src/sim/process.cc
@@ -47,6 +47,7 @@
#include "mem/translating_port.hh"
#include "sim/builder.hh"
#include "sim/process.hh"
+#include "sim/process_impl.hh"
#include "sim/stats.hh"
#include "sim/syscall_emul.hh"
#include "sim/system.hh"
@@ -182,7 +183,8 @@ Process::startup()
Port *mem_port;
mem_port = system->physmem->getPort("functional");
- initVirtMem = new TranslatingPort("process init port", pTable, true);
+ initVirtMem = new TranslatingPort("process init port", this,
+ TranslatingPort::Always);
mem_port->setPeer(initVirtMem);
initVirtMem->setPeer(mem_port);
}
@@ -250,6 +252,29 @@ Process::sim_fd(int tgt_fd)
return fd_map[tgt_fd];
}
+bool
+Process::checkAndAllocNextPage(Addr vaddr)
+{
+ // if this is an initial write we might not have
+ if (vaddr >= stack_min && vaddr < stack_base) {
+ pTable->allocate(roundDown(vaddr, VMPageSize), VMPageSize);
+ return true;
+ }
+
+ // We've accessed the next page of the stack, so extend the stack
+ // to cover it.
+ if(vaddr < stack_min && vaddr >= stack_min - TheISA::PageBytes)
+ {
+ stack_min -= TheISA::PageBytes;
+ if(stack_base - stack_min > 8*1024*1024)
+ fatal("Over max stack size for one thread\n");
+ pTable->allocate(stack_min, TheISA::PageBytes);
+ warn("Increasing stack size by one page.");
+ return true;
+ }
+ return false;
+}
+
void
Process::serialize(std::ostream &os)
{
diff --git a/src/sim/process.hh b/src/sim/process.hh
index dd64fa607..fa46b9c95 100644
--- a/src/sim/process.hh
+++ b/src/sim/process.hh
@@ -45,7 +45,6 @@
#include <vector>
#include "base/statistics.hh"
-#include "mem/translating_port.hh"
#include "sim/host.hh"
#include "sim/sim_object.hh"
@@ -60,28 +59,6 @@ namespace TheISA
class RemoteGDB;
}
-//This needs to be templated for cases where 32 bit pointers are needed.
-template<class AddrType>
-void
-copyStringArray(std::vector<std::string> &strings,
- AddrType array_ptr, AddrType data_ptr,
- TranslatingPort* memPort)
-{
- AddrType data_ptr_swap;
- for (int i = 0; i < strings.size(); ++i) {
- data_ptr_swap = htog(data_ptr);
- memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap,
- sizeof(AddrType));
- memPort->writeString(data_ptr, strings[i].c_str());
- array_ptr += sizeof(AddrType);
- data_ptr += strings[i].size() + 1;
- }
- // add NULL terminator
- data_ptr = 0;
-
- memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(AddrType));
-}
-
class Process : public SimObject
{
public:
@@ -194,6 +171,10 @@ class Process : public SimObject
virtual void syscall(int64_t callnum, ThreadContext *tc) = 0;
+ // check if the this addr is on the next available page and allocate it
+ // if it's not we'll panic
+ bool checkAndAllocNextPage(Addr vaddr);
+
void serialize(std::ostream &os);
void unserialize(Checkpoint *cp, const std::string &section);
};
diff --git a/src/sim/process_impl.hh b/src/sim/process_impl.hh
new file mode 100644
index 000000000..a3519fe39
--- /dev/null
+++ b/src/sim/process_impl.hh
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2001-2005 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: Nathan Binkert
+ * Steve Reinhardt
+ */
+
+#ifndef __SIM_PROCESS_IMPL_HH__
+#define __SIM_PROCESS_IMPL_HH__
+
+//
+// The purpose of this code is to fake the loader & syscall mechanism
+// when there's no OS: thus there's no reason to use it in FULL_SYSTEM
+// mode when we do have an OS.
+//
+#include "config/full_system.hh"
+
+#if !FULL_SYSTEM
+
+#include <string>
+#include <vector>
+
+#include "mem/translating_port.hh"
+
+
+//This needs to be templated for cases where 32 bit pointers are needed.
+template<class AddrType>
+void
+copyStringArray(std::vector<std::string> &strings,
+ AddrType array_ptr, AddrType data_ptr,
+ TranslatingPort* memPort)
+{
+ AddrType data_ptr_swap;
+ for (int i = 0; i < strings.size(); ++i) {
+ data_ptr_swap = htog(data_ptr);
+ memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr_swap,
+ sizeof(AddrType));
+ memPort->writeString(data_ptr, strings[i].c_str());
+ array_ptr += sizeof(AddrType);
+ data_ptr += strings[i].size() + 1;
+ }
+ // add NULL terminator
+ data_ptr = 0;
+
+ memPort->writeBlob(array_ptr, (uint8_t*)&data_ptr, sizeof(AddrType));
+}
+
+
+#endif // !FULL_SYSTEM
+
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-14 09:03:13 +0000