commit 7d70967abaf1ce3a09433620dc41ed48c2fc0db0
author Nikos Nikoleris <nikos.nikoleris@arm.com> Tue Feb 21 12:06:37 2017 +0000
committer Nikos Nikoleris <nikos.nikoleris@arm.com> Tue Dec 05 11:47:01 2017 +0000
tree afe7e0283905573ae9e8d3655401fabf45184148
parent 099cb037e83d1e7bb47ec0e8eaf649a63f889d38

arm: Add CMO support for Non-Cacheable memory

Cache Maintainance operations to the point of coherence are treated as
normal cahceable requests and clean and/or invalidate the caches of
all PEs.

Change-Id: Ia4a749c2318fe29c8601848b034b8315c4186c8a
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5056
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

src/arch/arm/tlb.cc

diff --git a/src/arch/arm/tlb.cc b/src/arch/arm/tlb.cc
index 6f7998d..de7ebf8 100644
--- a/src/arch/arm/tlb.cc
+++ b/src/arch/arm/tlb.cc
@@ -1007,7 +1007,10 @@
 
     if ((req->isInstFetch() && (!sctlr.i)) ||
         ((!req->isInstFetch()) && (!sctlr.c))){
-       req->setFlags(Request::UNCACHEABLE | Request::STRICT_ORDER);
+        if (!req->isCacheMaintenance()) {
+            req->setFlags(Request::UNCACHEABLE);
+        }
+        req->setFlags(Request::STRICT_ORDER);
     }
     if (!is_fetch) {
         assert(flags & MustBeOne);
@@ -1033,11 +1036,12 @@
             req->setFlags(Request::SECURE);
 
         // @todo: double check this (ARM ARM issue C B3.2.1)
-        if (long_desc_format || sctlr.tre == 0) {
-            req->setFlags(Request::UNCACHEABLE | Request::STRICT_ORDER);
-        } else {
-            if (nmrr.ir0 == 0 || nmrr.or0 == 0 || prrr.tr0 != 0x2)
-                req->setFlags(Request::UNCACHEABLE | Request::STRICT_ORDER);
+        if (long_desc_format || sctlr.tre == 0 || nmrr.ir0 == 0 ||
+            nmrr.or0 == 0 || prrr.tr0 != 0x2) {
+            if (!req->isCacheMaintenance()) {
+                req->setFlags(Request::UNCACHEABLE);
+            }
+            req->setFlags(Request::STRICT_ORDER);
         }
 
         // Set memory attributes
@@ -1091,7 +1095,7 @@
                 static_cast<uint8_t>(te->mtype), isStage2);
         setAttr(te->attributes);
 
-        if (te->nonCacheable)
+        if (te->nonCacheable && !req->isCacheMaintenance())
             req->setFlags(Request::UNCACHEABLE);
 
         // Require requests to be ordered if the request goes to