#ifndef __DEV_IO_DEVICE_HH__
#define __DEV_IO_DEVICE_HH__
-#include "base/chunk_generator.hh"
+#include "base/fast_alloc.hh"
#include "mem/mem_object.hh"
-#include "mem/packet_impl.hh"
-#include "sim/eventq.hh"
+#include "mem/packet.hh"
+#include "mem/tport.hh"
+#include "params/BasicPioDevice.hh"
+#include "params/DmaDevice.hh"
+#include "params/PioDevice.hh"
#include "sim/sim_object.hh"
+class Event;
class Platform;
class PioDevice;
class DmaDevice;
* sensitive to an address range use. The port takes all the memory
* access types and roles them into one read() and write() call that the device
* must respond to. The device must also provide the addressRanges() function
- * with which it returns the address ranges it is interested in. An extra
- * sendTiming() function is implemented which takes an delay. In this way the
- * device can immediatly call sendTiming(pkt, time) after processing a request
- * and the request will be handled by the port even if the port bus the device
- * connects to is blocked.
+ * with which it returns the address ranges it is interested in.
*/
-class PioPort : public Port
+class PioPort : public SimpleTimingPort
{
protected:
/** The device that this port serves. */
PioDevice *device;
- /** The system that device/port are in. This is used to select which mode
- * we are currently operating in. */
- System *sys;
-
- /** A list of outgoing timing response packets that haven't been serviced
- * yet. */
- std::list<Packet*> transmitList;
-
- /** The current status of the peer(bus) that we are connected to. */
- Status peerStatus;
-
- virtual bool recvTiming(Packet *pkt);
-
- virtual Tick recvAtomic(Packet *pkt);
-
- virtual void recvFunctional(Packet *pkt) ;
-
- virtual void recvStatusChange(Status status)
- { peerStatus = status; }
-
- virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
-
- void resendNacked(Packet *pkt);
-
- /**
- * This class is used to implemented sendTiming() with a delay. When a delay
- * is requested a new event is created. When the event time expires it
- * attempts to send the packet. If it cannot, the packet is pushed onto the
- * transmit list to be sent when recvRetry() is called. */
- class SendEvent : public Event
- {
- PioPort *port;
- Packet *packet;
-
- SendEvent(PioPort *p, Packet *pkt, Tick t)
- : Event(&mainEventQueue), port(p), packet(pkt)
- { schedule(curTick + t); }
-
- virtual void process();
-
- virtual const char *description()
- { return "Future scheduled sendTiming event"; }
-
- friend class PioPort;
- };
-
- /** Number of timing requests that are emulating the device timing before
- * attempting to end up on the bus.
- */
- int outTiming;
-
- /** If we need to drain, keep the drain event around until we're done
- * here.*/
- Event *drainEvent;
+ virtual Tick recvAtomic(PacketPtr pkt);
- /** Schedule a sendTiming() event to be called in the future. */
- void sendTiming(Packet *pkt, Tick time)
- { outTiming++; new PioPort::SendEvent(this, pkt, time); }
-
- /** This function is notification that the device should attempt to send a
- * packet again. */
- virtual void recvRetry();
+ virtual void getDeviceAddressRanges(AddrRangeList &resp,
+ bool &snoop);
public:
- PioPort(PioDevice *dev, System *s, std::string pname = "-pioport");
- unsigned int drain(Event *de);
-
- friend class PioPort::SendEvent;
+ PioPort(PioDevice *dev, System *s, std::string pname = "-pioport");
};
class DmaPort : public Port
{
protected:
- struct DmaReqState : public Packet::SenderState
+ struct DmaReqState : public Packet::SenderState, public FastAlloc
{
/** Event to call on the device when this transaction (all packets)
* complete. */
/** Number of bytes that have been acked for this transaction. */
Addr numBytes;
- DmaReqState(Event *ce, Port *p, Addr tb)
- : completionEvent(ce), outPort(p), totBytes(tb), numBytes(0)
+ /** Amount to delay completion of dma by */
+ Tick delay;
+
+
+ DmaReqState(Event *ce, Port *p, Addr tb, Tick _delay)
+ : completionEvent(ce), outPort(p), totBytes(tb), numBytes(0),
+ delay(_delay)
{}
};
- DmaDevice *device;
- std::list<Packet*> transmitList;
+ MemObject *device;
+ std::list<PacketPtr> transmitList;
/** The system that device/port are in. This is used to select which mode
* we are currently operating in. */
* here.*/
Event *drainEvent;
- virtual bool recvTiming(Packet *pkt);
- virtual Tick recvAtomic(Packet *pkt)
- { panic("dma port shouldn't be used for pio access."); }
- virtual void recvFunctional(Packet *pkt)
- { panic("dma port shouldn't be used for pio access."); }
+ /** time to wait between sending another packet, increases as NACKs are
+ * recived, decreases as responses are recived. */
+ Tick backoffTime;
+
+ /** Minimum time that device should back off for after failed sendTiming */
+ Tick minBackoffDelay;
+
+ /** Maximum time that device should back off for after failed sendTiming */
+ Tick maxBackoffDelay;
+
+ /** If the port is currently waiting for a retry before it can send whatever
+ * it is that it's sending. */
+ bool inRetry;
+
+ /** Port accesses a cache which requires snooping */
+ bool recvSnoops;
+
+ /** Records snoop response so we only reply once to a status change */
+ bool snoopRangeSent;
+
+ virtual bool recvTiming(PacketPtr pkt);
+ virtual Tick recvAtomic(PacketPtr pkt)
+ {
+ if (recvSnoops) return 0;
+
+ panic("dma port shouldn't be used for pio access."); M5_DUMMY_RETURN
+ }
+ virtual void recvFunctional(PacketPtr pkt)
+ {
+ if (recvSnoops) return;
+
+ panic("dma port shouldn't be used for pio access.");
+ }
virtual void recvStatusChange(Status status)
- { ; }
+ {
+ if (recvSnoops) {
+ if (status == RangeChange) {
+ if (!snoopRangeSent) {
+ snoopRangeSent = true;
+ sendStatusChange(Port::RangeChange);
+ }
+ return;
+ }
+ panic("Unexpected recvStatusChange\n");
+ }
+ }
virtual void recvRetry() ;
- virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
- { resp.clear(); snoop.clear(); }
+ virtual void getDeviceAddressRanges(AddrRangeList &resp,
+ bool &snoop)
+ { resp.clear(); snoop = recvSnoops; }
+
+ void queueDma(PacketPtr pkt, bool front = false);
+ void sendDma();
- void sendDma(Packet *pkt, bool front = false);
+ /** event to give us a kick every time we backoff time is reached. */
+ EventWrapper<DmaPort, &DmaPort::sendDma> backoffEvent;
public:
- DmaPort(DmaDevice *dev, System *s);
+ DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff,
+ bool recv_snoops = false);
void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
- uint8_t *data = NULL);
+ uint8_t *data, Tick delay, Request::Flags flag = 0);
bool dmaPending() { return pendingCount > 0; }
+ unsigned cacheBlockSize() const { return peerBlockSize(); }
unsigned int drain(Event *de);
};
* mode we are in, etc is handled by the PioPort so the device doesn't have to
* bother.
*/
-
class PioDevice : public MemObject
{
protected:
virtual void addressRanges(AddrRangeList &range_list) = 0;
- /** As far as the devices are concerned they only accept atomic transactions
- * which are converted to either a write or a read. */
- Tick recvAtomic(Packet *pkt)
- { return pkt->isRead() ? this->read(pkt) : this->write(pkt); }
-
- /** Pure virtual function that the device must implement. Called when a read
- * command is recieved by the port.
+ /** Pure virtual function that the device must implement. Called
+ * when a read command is recieved by the port.
* @param pkt Packet describing this request
* @return number of ticks it took to complete
*/
- virtual Tick read(Packet *pkt) = 0;
+ virtual Tick read(PacketPtr pkt) = 0;
/** Pure virtual function that the device must implement. Called when a
* write command is recieved by the port.
* @param pkt Packet describing this request
* @return number of ticks it took to complete
*/
- virtual Tick write(Packet *pkt) = 0;
+ virtual Tick write(PacketPtr pkt) = 0;
public:
- /** Params struct which is extended through each device based on the
- * parameters it needs. Since we are re-writing everything, we might as well
- * start from the bottom this time. */
+ typedef PioDeviceParams Params;
+ PioDevice(const Params *p);
+ virtual ~PioDevice();
- struct Params
+ const Params *
+ params() const
{
- std::string name;
- Platform *platform;
- System *system;
- };
-
- protected:
- Params *_params;
-
- public:
- const Params *params() const { return _params; }
-
- PioDevice(Params *p)
- : MemObject(p->name), platform(p->platform), sys(p->system),
- pioPort(NULL), _params(p)
- {}
-
- virtual ~PioDevice();
+ return dynamic_cast<const Params *>(_params);
+ }
virtual void init();
virtual unsigned int drain(Event *de);
- virtual Port *getPort(const std::string &if_name, int idx = -1)
- {
- if (if_name == "pio") {
- if (pioPort != NULL)
- panic("pio port already connected to.");
- pioPort = new PioPort(this, sys);
- return pioPort;
- } else
- return NULL;
- }
+ virtual Port *getPort(const std::string &if_name, int idx = -1);
+
friend class PioPort;
};
class BasicPioDevice : public PioDevice
{
- public:
- struct Params : public PioDevice::Params
- {
- Addr pio_addr;
- Tick pio_delay;
- };
-
protected:
/** Address that the device listens to. */
Addr pioAddr;
Tick pioDelay;
public:
- BasicPioDevice(Params *p)
- : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), pioDelay(p->pio_delay)
- {}
+ typedef BasicPioDeviceParams Params;
+ BasicPioDevice(const Params *p);
+
+ const Params *
+ params() const
+ {
+ return dynamic_cast<const Params *>(_params);
+ }
/** return the address ranges that this device responds to.
- * @params range_list range list to populate with ranges
+ * @param range_list range list to populate with ranges
*/
void addressRanges(AddrRangeList &range_list);
class DmaDevice : public PioDevice
{
- protected:
+ protected:
DmaPort *dmaPort;
public:
- DmaDevice(Params *p);
+ typedef DmaDeviceParams Params;
+ DmaDevice(const Params *p);
virtual ~DmaDevice();
- void dmaWrite(Addr addr, int size, Event *event, uint8_t *data)
- { dmaPort->dmaAction(Packet::WriteReq, addr, size, event, data) ; }
+ const Params *
+ params() const
+ {
+ return dynamic_cast<const Params *>(_params);
+ }
+
+ void dmaWrite(Addr addr, int size, Event *event, uint8_t *data, Tick delay = 0)
+ {
+ dmaPort->dmaAction(MemCmd::WriteReq, addr, size, event, data, delay);
+ }
- void dmaRead(Addr addr, int size, Event *event, uint8_t *data = NULL)
- { dmaPort->dmaAction(Packet::ReadReq, addr, size, event, data); }
+ void dmaRead(Addr addr, int size, Event *event, uint8_t *data, Tick delay = 0)
+ {
+ dmaPort->dmaAction(MemCmd::ReadReq, addr, size, event, data, delay);
+ }
bool dmaPending() { return dmaPort->dmaPending(); }
virtual unsigned int drain(Event *de);
- virtual Port *getPort(const std::string &if_name, int idx = -1)
- {
- if (if_name == "pio") {
- if (pioPort != NULL)
- panic("pio port already connected to.");
- pioPort = new PioPort(this, sys);
- return pioPort;
- } else if (if_name == "dma") {
- if (dmaPort != NULL)
- panic("dma port already connected to.");
- dmaPort = new DmaPort(this, sys);
- return dmaPort;
- } else
- return NULL;
- }
+ unsigned cacheBlockSize() const { return dmaPort->cacheBlockSize(); }
+
+ virtual Port *getPort(const std::string &if_name, int idx = -1);
friend class DmaPort;
};
projects / gem5.git / blobdiff