ruby: new atomics implementation

This patch changes the way that Ruby handles atomic RMW instructions. This implementation, unlike the prior one, is protocol independent. It works by locking an address from the sequencer immediately after the read portion of an RMW completes. When that address is locked, the coherence controller will only satisfy requests coming from one port (e.g., the mandatory queue) and will ignore all others. After the write portion completed, the line is unlocked. This should also work with multi-line atomics, as long as the blocks are always acquired in the same order.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/mem/protocol/MESI_CMP_directory-L1cache.sm b/src/mem/protocol/MESI_CMP_directory-L1cache.sm
index 8c8bbfaa6..39ede67ca 100644
--- a/src/mem/protocol/MESI_CMP_directory-L1cache.sm
+++ b/src/mem/protocol/MESI_CMP_directory-L1cache.sm
@@ -238,7 +238,7 @@ machine(L1Cache, "MSI Directory L1 Cache CMP")
   // Response IntraChip L1 Network - response msg to this L1 cache
   in_port(responseIntraChipL1Network_in, ResponseMsg, responseToL1Cache) {
     if (responseIntraChipL1Network_in.isReady()) {
-      peek(responseIntraChipL1Network_in, ResponseMsg) {
+      peek(responseIntraChipL1Network_in, ResponseMsg, block_on="Address") {
         assert(in_msg.Destination.isElement(machineID));
         if(in_msg.Type == CoherenceResponseType:DATA_EXCLUSIVE) {
           trigger(Event:Data_Exclusive, in_msg.Address);
@@ -271,7 +271,7 @@ machine(L1Cache, "MSI Directory L1 Cache CMP")
   // Request InterChip network - request from this L1 cache to the shared L2
   in_port(requestIntraChipL1Network_in, RequestMsg, requestToL1Cache) {
     if(requestIntraChipL1Network_in.isReady()) {
-      peek(requestIntraChipL1Network_in, RequestMsg) {
+      peek(requestIntraChipL1Network_in, RequestMsg, block_on="Address") {
         assert(in_msg.Destination.isElement(machineID));
         if (in_msg.Type == CoherenceRequestType:INV) {
           trigger(Event:Inv, in_msg.Address);
@@ -292,7 +292,7 @@ machine(L1Cache, "MSI Directory L1 Cache CMP")
   // Mandatory Queue betweens Node's CPU and it's L1 caches
   in_port(mandatoryQueue_in, CacheMsg, mandatoryQueue, desc="...") {
     if (mandatoryQueue_in.isReady()) {
-      peek(mandatoryQueue_in, CacheMsg) {
+      peek(mandatoryQueue_in, CacheMsg, block_on="LineAddress") {
 
         // Check for data access to blocks in I-cache and ifetchs to blocks in D-cache