mem: Add support for cache maintenance operation requests

This change adds new packet cmds and request flags for cache
maintenance operations.

1) A cache clean operation writes dirty data in the first memory below
the specified xbar and updates any old copies in the memories above
it.
2) A cache invalidate operation invalidates all copies of the
specified block in the memories above the specified xbar
3) A clean and invalidate operation is a combination of the two
operations above

Change-Id: If45702848bdd568de532cd57cba58499e5e4354c
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/5047
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/mem/packet.cc b/src/mem/packet.cc
index 8c44172c3..ffda3d5af 100644
--- a/src/mem/packet.cc
+++ b/src/mem/packet.cc
@@ -184,6 +184,24 @@ MemCmd::commandInfo[] =
     {SET2(IsRequest, NeedsResponse), MemFenceResp, "MemFenceReq"},
     /* MemFenceResp -- for synchronization responses */
     {SET1(IsResponse), InvalidCmd, "MemFenceResp"},
+    /* Cache Clean Request -- Update with the latest data all existing
+       copies of the block down to the point indicated by the
+       request */
+    { SET4(IsRequest, IsClean, NeedsResponse, FromCache),
+      CleanSharedResp, "CleanSharedReq" },
+    /* Cache Clean Response - Indicates that all caches up to the
+       specified point of reference have a up-to-date copy of the
+       cache block or no copy at all */
+    { SET2(IsResponse, IsClean), InvalidCmd, "CleanSharedResp" },
+    /* Cache Clean and Invalidate Request -- Invalidate all existing
+       copies down to the point indicated by the request */
+    { SET5(IsRequest, IsInvalidate, IsClean, NeedsResponse, FromCache),
+      CleanInvalidResp, "CleanInvalidReq" },
+     /* Cache Clean and Invalidate Respose -- Indicates that no cache
+        above the specified point holds the block and that the block
+        was written to a memory below the specified point. */
+    { SET3(IsResponse, IsInvalidate, IsClean),
+      InvalidCmd, "CleanInvalidResp" },
     /* InvalidDestError  -- packet dest field invalid */
     { SET2(IsResponse, IsError), InvalidCmd, "InvalidDestError" },
     /* BadAddressError   -- memory address invalid */