288e5c47fa
It's possible to bridge together the memory interconnect of two systems, either as parallel peers, or one nested inside the other. Each System will have its own set of RequestorIDs, and using an ID from one System inside the other can lead to a number of different problems. This change adds a new SimObject called SysBridge which connects two Systems interconnect together. The object allocates a requestor ID in each system, and for all PacketPtrs passing through it, the requestor ID from the target system is installed in the associated Request. On the way back, either inline or in a split, delayed response, the original RequestorID is restored by reinstalling the original Request object. Change-Id: I237c668962a04ef6dfc872df16762a884c05ede9 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54743 Reviewed-by: Jesse Pai <jessepai@google.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
43 lines
2.1 KiB
Python
43 lines
2.1 KiB
Python
# Copyright 2021 Google, Inc.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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from m5.params import *
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from m5.SimObject import SimObject
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class SysBridge(SimObject):
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'''Use this bridge to connect the memory systems belonging to two different
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Systems SimObjects. See the header file for more information.'''
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type = 'SysBridge'
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cxx_header = "mem/sys_bridge.hh"
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cxx_class = 'gem5::SysBridge'
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source = Param.System("Source System")
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target = Param.System("Target System")
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target_port = RequestPort(
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"A port which sends requests to a target system.")
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source_port = ResponsePort(
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"A port which sends responses to a source system")
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