ruby: coherence protocols: remove data block from dirctory entry

This patch removes the data block present in the directory entry structure
of each protocol in gem5's mainline.  Firstly, this is required for moving
towards common set of memory controllers for classic and ruby memory systems.
Secondly, the data block was being misused in several places.  It was being
used for having free access to the physical memory instead of calling on the
memory controller.

From now on, the directory controller will not have a direct visibility into
the physical memory.  The Memory Vector object now resides in the
Memory Controller class.  This also means that some significant changes are
being made to the functional accesses in ruby.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/mem/protocol/MI_example-dma.sm b/src/mem/protocol/MI_example-dma.sm
index e328d9e20..c3cc29ba2 100644
--- a/src/mem/protocol/MI_example-dma.sm
+++ b/src/mem/protocol/MI_example-dma.sm
@@ -66,8 +66,12 @@ machine(DMA, "DMA Controller")
   void setAccessPermission(Address addr, State state) {
   }
 
-  DataBlock getDataBlock(Address addr), return_by_ref="yes" {
-    error("DMA Controller does not support getDataBlock function.\n");
+  void functionalRead(Address addr, Packet *pkt) {
+    error("DMA does not support functional read.");
+  }
+
+  int functionalWrite(Address addr, Packet *pkt) {
+    error("DMA does not support functional write.");
   }
 
   out_port(requestToDir_out, DMARequestMsg, requestToDir, desc="...");