From 08e9f2514112eaa1cbecff025645906747c8f605 Mon Sep 17 00:00:00 2001 From: Nikos Nikoleris Date: Fri, 29 Sep 2017 15:00:55 +0100 Subject: [PATCH] mem: Add function to check if the slave can receive a timing req This changeset adds support for tryTiming, an interface that allows a master to check if the slave is busy or otherwise if it can accept a timing request. Change-Id: Idc7c2337ae9ccf5dec54f308e488660591419a63 Reviewed-on: https://gem5-review.googlesource.com/5041 Maintainer: Nikos Nikoleris Reviewed-by: Christian Menard Reviewed-by: Jason Lowe-Power --- src/mem/port.cc | 9 ++++++++- src/mem/port.hh | 22 +++++++++++++++++++++- 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/src/mem/port.cc b/src/mem/port.cc index 2111fa429..756eb8bdd 100644 --- a/src/mem/port.cc +++ b/src/mem/port.cc @@ -1,5 +1,5 @@ /* - * Copyright (c) 2012,2015 ARM Limited + * Copyright (c) 2012,2015,2017 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -183,6 +183,13 @@ MasterPort::sendTimingReq(PacketPtr pkt) return _slavePort->recvTimingReq(pkt); } +bool +MasterPort::tryTiming(PacketPtr pkt) const +{ + assert(pkt->isRequest()); + return _slavePort->tryTiming(pkt); +} + bool MasterPort::sendTimingSnoopResp(PacketPtr pkt) { diff --git a/src/mem/port.hh b/src/mem/port.hh index 0d88441dc..39f6dead8 100644 --- a/src/mem/port.hh +++ b/src/mem/port.hh @@ -1,5 +1,5 @@ /* - * Copyright (c) 2011-2012,2015 ARM Limited + * Copyright (c) 2011-2012,2015,2017 ARM Limited * All rights reserved * * The license below extends only to copyright in the software and shall @@ -223,6 +223,19 @@ class MasterPort : public BaseMasterPort */ bool sendTimingReq(PacketPtr pkt); + /** + * Check if the slave can handle a timing request. + * + * If the send cannot be handled at the moment, as indicated by + * the return value, then the sender will receive a recvReqRetry + * at which point it can re-issue a sendTimingReq. + * + * @param pkt Packet to send. + * + * @return If the send was succesful or not. + */ + bool tryTiming(PacketPtr pkt) const; + /** * Attempt to send a timing snoop response packet to the slave * port by calling its corresponding receive function. If the send @@ -451,6 +464,13 @@ class SlavePort : public BaseSlavePort */ virtual bool recvTimingReq(PacketPtr pkt) = 0; + /** + * Availability request from the master port. + */ + virtual bool tryTiming(PacketPtr pkt) { + panic("%s was not expecting a %s\n", name(), __func__); + } + /** * Receive a timing snoop response from the master port. */ -- 2.30.2