mem: Make ruby AbstractController compatible with XBar
At the moment the ruby AbstractController is trying to re-send the same
memory request every clock cycle until it finally succeeds [1]
(in other words it is not waiting for a recvReqRetry from the peer
port)
This polling behaviour is not compatible with the gem5 XBar, which is
panicking if it receives two consecutive requests to the same BUSY
layer [2]
This patch is fixing the incompatibility by inhibiting the
AbstractController retry until it gets a notification from the peer
response port
[1]: https://github.com/gem5/gem5/blob/v21.1.0.1/\
src/mem/ruby/slicc_interface/AbstractController.cc#L303
[2]: https://github.com/gem5/gem5/blob/v21.1.0.1/src/mem/xbar.cc#L196
Change-Id: I0ac38ce286051fb714844de569c2ebf85e71a523
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50367
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed
