mem: Add a WriteClean command to the packet class
A WriteClean packet allows a cache to write a block to a memory below
without evicting its copy. A typical usecase for a WriteClean packet
is a cache clean operation.
Change-Id: If356cb067da5ddf3210c135f41ef0891fb811568
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Anouk Van Laer <anouk.vanlaer@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5044
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
diff --git a/src/mem/packet.cc b/src/mem/packet.cc
index e05783c..75dfb28 100644
--- a/src/mem/packet.cc
+++ b/src/mem/packet.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2011-2016 ARM Limited
+ * Copyright (c) 2011-2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -95,6 +95,9 @@
* dirty. */
{ SET5(IsWrite, IsRequest, IsEviction, HasData, FromCache),
InvalidCmd, "WritebackClean" },
+ /* WriteClean - This allows a cache to write a dirty block to a memory
+ below without evicting its copy. */
+ { SET4(IsWrite, IsRequest, HasData, FromCache), InvalidCmd, "WriteClean" },
/* CleanEvict */
{ SET3(IsRequest, IsEviction, FromCache), InvalidCmd, "CleanEvict" },
/* SoftPFReq */
diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index 0920f22..330e2ae 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2012-2016 ARM Limited
+ * Copyright (c) 2012-2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -88,6 +88,7 @@
WriteResp,
WritebackDirty,
WritebackClean,
+ WriteClean, // writes dirty data below without evicting
CleanEvict,
SoftPFReq,
HardPFReq,
