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authorNikos Nikoleris <nikos.nikoleris@arm.com>2016-12-05 16:48:19 -0500
committerNikos Nikoleris <nikos.nikoleris@arm.com>2016-12-05 16:48:19 -0500
commit0bd9dfb8dee9afae4f87b89435c11fa581a71983 (patch)
tree6339641038d51b40b7410e9c1ee862aef63bf11d /COPYING
parentd28c2906f4125ce8704ce9cefa471f1a5050eeae (diff)
downloadgem5-0bd9dfb8dee9afae4f87b89435c11fa581a71983.tar.xz
mem: Service only the 1st FromCPU MSHR target on ReadRespWithInv
A response to a ReadReq can either be a ReadResp or a ReadRespWithInvalidate. As we add targets to an MSHR for a ReadReq we assume that the response will be a ReadResp. When the response is invalidating (ReadRespWithInvalidate) servicing more than one targets can potentially violate the memory ordering. This change fixes the way we handle a ReadRespWithInvalidate. When a cache receives a ReadRespWithInvalidate we service only the first FromCPU target and all the FromSnoop targets from the MSHR target list. The rest of the FromCPU targets are deferred and serviced by a new request. Change-Id: I75c30c268851987ee5f8644acb46f440b4eeeec2 Reviewed-by: Andreas Hansson <andreas.hansson@arm.com> Reviewed-by: Stephan Diestelhorst <stephan.diestelhorst@arm.com>
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