#ifndef __DEV_IO_DEVICE_HH__
#define __DEV_IO_DEVICE_HH__
+#include "base/fast_alloc.hh"
#include "mem/mem_object.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;
virtual Tick recvAtomic(PacketPtr pkt);
virtual void getDeviceAddressRanges(AddrRangeList &resp,
- AddrRangeList &snoop);
+ bool &snoop);
public:
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;
+ MemObject *device;
std::list<PacketPtr> transmitList;
/** The system that device/port are in. This is used to select which mode
* here.*/
Event *drainEvent;
+ /** 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)
- { panic("dma port shouldn't be used for pio access."); M5_DUMMY_RETURN }
+ {
+ if (recvSnoops) return 0;
+
+ panic("dma port shouldn't be used for pio access."); M5_DUMMY_RETURN
+ }
virtual void recvFunctional(PacketPtr pkt)
- { panic("dma port shouldn't be used for pio access."); }
+ {
+ 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(); }
+ bool &snoop)
+ { resp.clear(); snoop = recvSnoops; }
+
+ void queueDma(PacketPtr pkt, bool front = false);
+ void sendDma();
- void sendDma(PacketPtr 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; }
- int cacheBlockSize() { return peerBlockSize(); }
+ unsigned cacheBlockSize() const { return peerBlockSize(); }
unsigned int drain(Event *de);
};
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. */
- struct Params
- {
- 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)
- {}
-
+ typedef PioDeviceParams Params;
+ PioDevice(const Params *p);
virtual ~PioDevice();
+ const Params *
+ params() const
+ {
+ 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.
* @param range_list range list to populate with ranges
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)
+ const Params *
+ params() const
{
- dmaPort->dmaAction(MemCmd::WriteInvalidateReq,
- addr, size, event, data);
+ return dynamic_cast<const Params *>(_params);
}
- void dmaRead(Addr addr, int size, Event *event, uint8_t *data)
+ void dmaWrite(Addr addr, int size, Event *event, uint8_t *data, Tick delay = 0)
{
- dmaPort->dmaAction(MemCmd::ReadReq, addr, size, event, data);
+ dmaPort->dmaAction(MemCmd::WriteReq, addr, size, event, data, delay);
+ }
+
+ 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);
- int cacheBlockSize() { return dmaPort->cacheBlockSize(); }
+ unsigned cacheBlockSize() const { return dmaPort->cacheBlockSize(); }
- 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;
- }
+ virtual Port *getPort(const std::string &if_name, int idx = -1);
friend class DmaPort;
};
projects / gem5.git / blobdiff