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44 #ifndef __DEV_DMA_DEVICE_HH__
45 #define __DEV_DMA_DEVICE_HH__
49 #include "dev/io_device.hh"
50 #include "params/DmaDevice.hh"
52 class DmaPort : public MasterPort
55 struct DmaReqState : public Packet::SenderState
57 /** Event to call on the device when this transaction (all packets)
59 Event *completionEvent;
61 /** Total number of bytes that this transaction involves. */
64 /** Number of bytes that have been acked for this transaction. */
67 /** Amount to delay completion of dma by */
70 DmaReqState(Event *ce, Addr tb, Tick _delay)
71 : completionEvent(ce), totBytes(tb), numBytes(0), delay(_delay)
77 /** Use a deque as we never to any insertion or removal in the middle */
78 std::deque<PacketPtr> transmitList;
80 /** The system that device/port are in. This is used to select which mode
81 * we are currently operating in. */
84 /** Id for all requests */
87 /** Number of outstanding packets the dma port has. */
88 uint32_t pendingCount;
90 /** If we need to drain, keep the drain event around until we're done
94 /** If the port is currently waiting for a retry before it can
95 * send whatever it is that it's sending. */
99 * Handle a response packet by updating the corresponding DMA
100 * request state to reflect the bytes received, and also update
101 * the pending request counter. If the DMA request that this
102 * packet is part of is complete, then signal the completion event
103 * if present, potentially with a delay added to it.
105 * @param pkt Response packet to handler
106 * @param delay Additional delay for scheduling the completion event
108 void handleResp(PacketPtr pkt, Tick delay = 0);
110 bool recvTimingResp(PacketPtr pkt);
113 void queueDma(PacketPtr pkt);
118 DmaPort(MemObject *dev, System *s);
120 void dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
121 uint8_t *data, Tick delay, Request::Flags flag = 0);
123 bool dmaPending() const { return pendingCount > 0; }
125 unsigned cacheBlockSize() const { return peerBlockSize(); }
126 unsigned int drain(Event *de);
129 class DmaDevice : public PioDevice
135 typedef DmaDeviceParams Params;
136 DmaDevice(const Params *p);
137 virtual ~DmaDevice() { }
139 void dmaWrite(Addr addr, int size, Event *event, uint8_t *data,
142 dmaPort.dmaAction(MemCmd::WriteReq, addr, size, event, data, delay);
145 void dmaRead(Addr addr, int size, Event *event, uint8_t *data,
148 dmaPort.dmaAction(MemCmd::ReadReq, addr, size, event, data, delay);
151 bool dmaPending() { return dmaPort.dmaPending(); }
155 virtual unsigned int drain(Event *de);
157 unsigned cacheBlockSize() const { return dmaPort.cacheBlockSize(); }
159 virtual MasterPort &getMasterPort(const std::string &if_name,
162 friend class DmaPort;
165 #endif // __DEV_DMA_DEVICE_HH__