diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mem/simple_dram.cc | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/src/mem/simple_dram.cc b/src/mem/simple_dram.cc index 3dc59e8e0..b17ce68d0 100644 --- a/src/mem/simple_dram.cc +++ b/src/mem/simple_dram.cc @@ -38,6 +38,7 @@ * Ani Udipi */ +#include "debug/Drain.hh" #include "debug/DRAM.hh" #include "debug/DRAMWR.hh" #include "mem/simple_dram.hh" @@ -934,15 +935,18 @@ SimpleDRAM::scheduleNextReq() DPRINTF(DRAM, "Reached scheduleNextReq()\n"); // Figure out which request goes next, and move it to front() - if (!chooseNextReq()) - return; - - doDRAMAccess(dramReadQueue.front()); + if (!chooseNextReq()) { + // In the case there is no read request to go next, see if we + // are asked to drain, and if so trigger writes, this also + // ensures that if we hit the write limit we will do this + // multiple times until we are completely drained + if (drainManager && !dramWriteQueue.empty() && !writeEvent.scheduled()) + triggerWrites(); + } else { + doDRAMAccess(dramReadQueue.front()); + } } - - - Tick SimpleDRAM::maxBankFreeAt() const { @@ -1212,8 +1216,18 @@ SimpleDRAM::drain(DrainManager *dm) // of that as well if (!(dramWriteQueue.empty() && dramReadQueue.empty() && dramRespQueue.empty())) { + DPRINTF(Drain, "DRAM controller not drained, write: %d, read: %d," + " resp: %d\n", dramWriteQueue.size(), dramReadQueue.size(), + dramRespQueue.size()); ++count; drainManager = dm; + // the only part that is not drained automatically over time + // is the write queue, thus trigger writes if there are any + // waiting and no reads waiting, otherwise wait until the + // reads are done + if (dramReadQueue.empty() && !dramWriteQueue.empty() && + !writeEvent.scheduled()) + triggerWrites(); } if (count) |