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-rw-r--r--src/dev/arm/pl111.cc24
-rw-r--r--src/dev/arm/pl111.hh51
2 files changed, 66 insertions, 9 deletions
diff --git a/src/dev/arm/pl111.cc b/src/dev/arm/pl111.cc
index 2973cda27..cd1f00272 100644
--- a/src/dev/arm/pl111.cc
+++ b/src/dev/arm/pl111.cc
@@ -68,7 +68,9 @@ Pl111::Pl111(const Params *p)
vnc(p->vnc), bmp(NULL), width(LcdMaxWidth), height(LcdMaxHeight),
bytesPerPixel(4), startTime(0), startAddr(0), maxAddr(0), curAddr(0),
waterMark(0), dmaPendingNum(0), readEvent(this), fillFifoEvent(this),
- dmaDoneEvent(maxOutstandingDma, this), intEvent(this)
+ dmaDoneEventAll(maxOutstandingDma, this),
+ dmaDoneEventFree(maxOutstandingDma),
+ intEvent(this)
{
pioSize = 0xFFFF;
@@ -81,6 +83,9 @@ Pl111::Pl111(const Params *p)
memset(cursorImage, 0, sizeof(cursorImage));
memset(dmaBuffer, 0, buffer_size);
+ for (int i = 0; i < maxOutstandingDma; ++i)
+ dmaDoneEventFree[i] = &dmaDoneEventAll[i];
+
if (vnc)
vnc->setFramebufferAddr(dmaBuffer);
}
@@ -458,14 +463,17 @@ Pl111::fillFifo()
// due to assertion in scheduling state
++dmaPendingNum;
- assert(!dmaDoneEvent[dmaPendingNum-1].scheduled());
+ assert(!dmaDoneEventFree.empty());
+ DmaDoneEvent *event(dmaDoneEventFree.back());
+ dmaDoneEventFree.pop_back();
+ assert(!event->scheduled());
// We use a uncachable request here because the requests from the CPU
// will be uncacheable as well. If we have uncacheable and cacheable
// requests in the memory system for the same address it won't be
// pleased
dmaPort.dmaAction(MemCmd::ReadReq, curAddr + startAddr, dmaSize,
- &dmaDoneEvent[dmaPendingNum-1], curAddr + dmaBuffer,
+ event, curAddr + dmaBuffer,
0, Request::UNCACHEABLE);
curAddr += dmaSize;
}
@@ -599,8 +607,8 @@ Pl111::serialize(std::ostream &os)
vector<Tick> dma_done_event_tick;
dma_done_event_tick.resize(maxOutstandingDma);
for (int x = 0; x < maxOutstandingDma; x++) {
- dma_done_event_tick[x] = dmaDoneEvent[x].scheduled() ?
- dmaDoneEvent[x].when() : 0;
+ dma_done_event_tick[x] = dmaDoneEventAll[x].scheduled() ?
+ dmaDoneEventAll[x].when() : 0;
}
arrayParamOut(os, "dma_done_event_tick", dma_done_event_tick);
}
@@ -701,10 +709,14 @@ Pl111::unserialize(Checkpoint *cp, const std::string &section)
vector<Tick> dma_done_event_tick;
dma_done_event_tick.resize(maxOutstandingDma);
arrayParamIn(cp, section, "dma_done_event_tick", dma_done_event_tick);
+ dmaDoneEventFree.clear();
for (int x = 0; x < maxOutstandingDma; x++) {
if (dma_done_event_tick[x])
- schedule(dmaDoneEvent[x], dma_done_event_tick[x]);
+ schedule(dmaDoneEventAll[x], dma_done_event_tick[x]);
+ else
+ dmaDoneEventFree.push_back(&dmaDoneEventAll[x]);
}
+ assert(maxOutstandingDma - dmaDoneEventFree.size() == dmaPendingNum);
if (lcdControl.lcdpwr) {
updateVideoParams();
diff --git a/src/dev/arm/pl111.hh b/src/dev/arm/pl111.hh
index 2388e1c7a..2245d8124 100644
--- a/src/dev/arm/pl111.hh
+++ b/src/dev/arm/pl111.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2010 ARM Limited
+ * Copyright (c) 2010-2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -161,6 +161,31 @@ class Pl111: public AmbaDmaDevice
Bitfield<16> watermark;
EndBitUnion(ControlReg)
+ /**
+ * Event wrapper for dmaDone()
+ *
+ * This event calls pushes its this pointer onto the freeDoneEvent
+ * vector and calls dmaDone() when triggered.
+ */
+ class DmaDoneEvent : public Event
+ {
+ private:
+ Pl111 &obj;
+
+ public:
+ DmaDoneEvent(Pl111 *_obj)
+ : Event(), obj(*_obj) {}
+
+ void process() {
+ obj.dmaDoneEventFree.push_back(this);
+ obj.dmaDone();
+ }
+
+ const std::string name() const {
+ return obj.name() + ".DmaDoneEvent";
+ }
+ };
+
/** Horizontal axis panel control register */
TimingReg0 lcdTiming0;
@@ -296,8 +321,28 @@ class Pl111: public AmbaDmaDevice
/** Fill fifo */
EventWrapper<Pl111, &Pl111::fillFifo> fillFifoEvent;
- /** DMA done event */
- std::vector<EventWrapper<Pl111, &Pl111::dmaDone> > dmaDoneEvent;
+ /**@{*/
+ /**
+ * All pre-allocated DMA done events
+ *
+ * The PL111 model preallocates maxOutstandingDma number of
+ * DmaDoneEvents to avoid having to heap allocate every single
+ * event when it is needed. In order to keep track of which events
+ * are in flight and which are ready to be used, we use two
+ * different vectors. dmaDoneEventAll contains <i>all</i>
+ * DmaDoneEvents that the object may use, while dmaDoneEventFree
+ * contains a list of currently <i>unused</i> events. When an
+ * event needs to be scheduled, the last element of the
+ * dmaDoneEventFree is used and removed from the list. When an
+ * event fires, it is added to the end of the
+ * dmaEventFreeList. dmaDoneEventAll is never used except for in
+ * initialization and serialization.
+ */
+ std::vector<DmaDoneEvent> dmaDoneEventAll;
+
+ /** Unused DMA done events that are ready to be scheduled */
+ std::vector<DmaDoneEvent *> dmaDoneEventFree;
+ /**@}*/
/** Wrapper to create an event out of the interrupt */
EventWrapper<Pl111, &Pl111::generateInterrupt> intEvent;