O3, Ruby: Forward invalidations from Ruby to O3 CPU

This patch implements the functionality for forwarding invalidations and
replacements from the L1 cache of the Ruby memory system to the O3 CPU. The
implementation adds a list of ports to RubyPort. Whenever a replacement or an
invalidation is performed, the L1 cache forwards this to all the ports, which
is the LSQ in case of the O3 CPU.

1 files changed, 25 insertions, 1 deletions

diff --git a/src/mem/protocol/MOESI_hammer-cache.sm b/src/mem/protocol/MOESI_hammer-cache.sm
index ce16a8777..219096d26 100644
--- a/src/mem/protocol/MOESI_hammer-cache.sm
+++ b/src/mem/protocol/MOESI_hammer-cache.sm
@@ -41,7 +41,8 @@ machine(L1Cache, "AMD Hammer-like protocol")
   int cache_response_latency = 10,
   int issue_latency = 2,
   int l2_cache_hit_latency = 10,
-  bool no_mig_atomic = true
+  bool no_mig_atomic = true,
+  bool send_evictions
 {
 
   // NETWORK BUFFERS
@@ -1207,6 +1208,13 @@ machine(L1Cache, "AMD Hammer-like protocol")
     unset_cache_entry();
   }
 
+  action(forward_eviction_to_cpu, "\cc", desc="sends eviction information to the processor") {
+    if (send_evictions) {
+      DPRINTF(RubySlicc, "Sending invalidation for %s to the CPU\n", address);
+      sequencer.evictionCallback(address);
+    }
+  }
+
   action(uu_profileMiss, "\u", desc="Profile the demand miss") {
     peek(mandatoryQueue_in, RubyRequest) {
       if (L1IcacheMemory.isTagPresent(address)) {
@@ -1486,17 +1494,20 @@ machine(L1Cache, "AMD Hammer-like protocol")
     i_allocateTBE;
     bf_issueGETF;
     uu_profileMiss;
+    forward_eviction_to_cpu;
     gg_deallocateL1CacheBlock;
     k_popMandatoryQueue;
   }
 
   transition(S, L2_Replacement, I) {
+    forward_eviction_to_cpu;
     rr_deallocateL2CacheBlock;
     ka_wakeUpAllDependents;
   }
 
   transition(S, {Other_GETX, Invalidate}, I) {
     f_sendAck;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -1528,6 +1539,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
     bf_issueGETF;
     p_decrementNumberOfMessagesByOne;
     uu_profileMiss;
+    forward_eviction_to_cpu;
     gg_deallocateL1CacheBlock;
     k_popMandatoryQueue;
   }
@@ -1535,12 +1547,14 @@ machine(L1Cache, "AMD Hammer-like protocol")
   transition(O, L2_Replacement, OI) {
     i_allocateTBE;
     d_issuePUT;
+    forward_eviction_to_cpu;
     rr_deallocateL2CacheBlock;
     ka_wakeUpAllDependents;
   }
 
   transition(O, {Other_GETX, Invalidate}, I) {
     e_sendData;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -1569,6 +1583,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
     i_allocateTBE;
     bf_issueGETF;
     p_decrementNumberOfMessagesByOne;
+    forward_eviction_to_cpu;
     gg_deallocateL1CacheBlock;
     k_popMandatoryQueue;
   }
@@ -1582,17 +1597,20 @@ machine(L1Cache, "AMD Hammer-like protocol")
   transition(MM, L2_Replacement, MI) {
     i_allocateTBE;
     d_issuePUT;
+    forward_eviction_to_cpu;
     rr_deallocateL2CacheBlock;
     ka_wakeUpAllDependents;
   }
 
   transition(MM, {Other_GETX, Invalidate}, I) {
     c_sendExclusiveData;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
   transition(MM, Other_GETS, I) {
     c_sendExclusiveData;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
   
@@ -1625,12 +1643,14 @@ machine(L1Cache, "AMD Hammer-like protocol")
   transition(M, L2_Replacement, MI) {
     i_allocateTBE;
     d_issuePUT;
+    forward_eviction_to_cpu;
     rr_deallocateL2CacheBlock;
     ka_wakeUpAllDependents;
   }
 
   transition(M, {Other_GETX, Invalidate}, I) {
     c_sendExclusiveData;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -1700,11 +1720,13 @@ machine(L1Cache, "AMD Hammer-like protocol")
 
   transition(SM, {Other_GETX, Invalidate}, IM) {
     f_sendAck;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
   transition(SM_F, {Other_GETX, Invalidate}, IM_F) {
     f_sendAck;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -1754,12 +1776,14 @@ machine(L1Cache, "AMD Hammer-like protocol")
   transition(OM, {Other_GETX, Invalidate}, IM) {
     e_sendData;
     pp_incrementNumberOfMessagesByOne;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
   transition(OM_F, {Other_GETX, Invalidate}, IM_F) {
     q_sendDataFromTBEToCache;
     pp_incrementNumberOfMessagesByOne;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }