diff options
| author | Nikos Nikoleris <nikos.nikoleris@arm.com> | 2017-09-29 15:00:55 +0100 |
|---|---|---|
| committer | Nikos Nikoleris <nikos.nikoleris@arm.com> | 2017-12-05 11:47:01 +0000 |
| commit | 08e9f2514112eaa1cbecff025645906747c8f605 (patch) | |
| tree | 62fcdf152c5b57183007b98c49e939ae4b8f01e1 /src/mem | |
| parent | 2f468fc03696a865ee2e80f01340c58b77e854f4 (diff) | |
| download | gem5-08e9f2514112eaa1cbecff025645906747c8f605.tar.xz | |
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 <nikos.nikoleris@arm.com>
Reviewed-by: Christian Menard <christian.menard@tu-dresden.de>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Diffstat (limited to 'src/mem')
| -rw-r--r-- | src/mem/port.cc | 9 | ||||
| -rw-r--r-- | 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 @@ -184,6 +184,13 @@ MasterPort::sendTimingReq(PacketPtr pkt) } bool +MasterPort::tryTiming(PacketPtr pkt) const +{ + assert(pkt->isRequest()); + return _slavePort->tryTiming(pkt); +} + +bool MasterPort::sendTimingSnoopResp(PacketPtr pkt) { assert(pkt->isResponse()); 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 @@ -224,6 +224,19 @@ 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 * does not succeed, as indicated by the return value, then the @@ -452,6 +465,13 @@ 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. */ virtual bool recvTimingSnoopResp(PacketPtr pkt) |