From 63563c9df2eca46231768a448e981e8bb7856655 Mon Sep 17 00:00:00 2001
From: Nilay Vaish <nilay@cs.wisc.edu>
Date: Mon, 23 Jan 2012 11:07:14 -0600
Subject: 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.

---
 src/mem/protocol/MOESI_CMP_directory-L1cache.sm | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'src/mem/protocol/MOESI_CMP_directory-L1cache.sm')

diff --git a/src/mem/protocol/MOESI_CMP_directory-L1cache.sm b/src/mem/protocol/MOESI_CMP_directory-L1cache.sm
index 2845d1ad1..7a5cc6511 100644
--- a/src/mem/protocol/MOESI_CMP_directory-L1cache.sm
+++ b/src/mem/protocol/MOESI_CMP_directory-L1cache.sm
@@ -37,7 +37,8 @@ machine(L1Cache, "Directory protocol")
    CacheMemory * L1IcacheMemory,
    CacheMemory * L1DcacheMemory,
    int l2_select_num_bits,
-   int request_latency = 2
+   int request_latency = 2,
+   bool send_evictions
 {
 
   // NODE L1 CACHE
@@ -530,7 +531,6 @@ machine(L1Cache, "Directory protocol")
     }
   }
 
-
   action(ee_sendDataExclusive, "\e", desc="Send data from cache to requestor, don't keep a shared copy") {
     peek(requestNetwork_in, RequestMsg) {
       assert(is_valid(cache_entry));
@@ -689,7 +689,6 @@ machine(L1Cache, "Directory protocol")
     useTimerTable.set(address, 50);
   }
 
-
   action(ub_dmaUnblockL2Cache, "ub", desc="Send dma ack to l2 cache") {
     peek(requestNetwork_in, RequestMsg) {
       enqueue(responseNetwork_out, ResponseMsg, latency=request_latency) {
@@ -775,7 +774,6 @@ machine(L1Cache, "Directory protocol")
     }
   }
 
-
   // L2 will usually request data for a writeback
   action(qq_sendWBDataFromTBEToL2, "\q", desc="Send data from TBE to L2") {
     enqueue(responseNetwork_out, ResponseMsg, latency=request_latency) {
@@ -811,7 +809,6 @@ machine(L1Cache, "Directory protocol")
         //assert(in_msg.Dirty == false);
       }
     }
-
   }
 
   action(v_writeDataToCacheVerify, "v", desc="Write data to cache, assert it was same as before") {
@@ -844,7 +841,12 @@ machine(L1Cache, "Directory protocol")
     }
   }
 
-
+  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) {
@@ -931,11 +933,13 @@ machine(L1Cache, "Directory protocol")
   transition(S, L1_Replacement, SI) {
     i_allocateTBE;
     dd_issuePUTS;
+    forward_eviction_to_cpu;
     kk_deallocateL1CacheBlock;
   }
 
   transition(S, Inv, I) {
     f_sendAck;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -966,11 +970,13 @@ machine(L1Cache, "Directory protocol")
   transition(O, L1_Replacement, OI) {
     i_allocateTBE;
     dd_issuePUTO;
+    forward_eviction_to_cpu;
     kk_deallocateL1CacheBlock;
   }
 
   transition(O, Fwd_GETX, I) {
     ee_sendDataExclusive;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -999,16 +1005,19 @@ machine(L1Cache, "Directory protocol")
   transition(MM, L1_Replacement, MI) {
     i_allocateTBE;
     d_issuePUTX;
+    forward_eviction_to_cpu;
     kk_deallocateL1CacheBlock;
   }
 
   transition(MM, Fwd_GETX, I) {
     ee_sendDataExclusive;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
   transition(MM, Fwd_GETS, I) {
     ee_sendDataExclusive;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -1037,12 +1046,14 @@ machine(L1Cache, "Directory protocol")
   transition(M, L1_Replacement, MI) {
     i_allocateTBE;
     d_issuePUTX;
+    forward_eviction_to_cpu;
     kk_deallocateL1CacheBlock;
   }
 
   transition(M, Fwd_GETX, I) {
     // e_sendData;
     ee_sendDataExclusive;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
@@ -1080,6 +1091,7 @@ machine(L1Cache, "Directory protocol")
   // Transitions from SM
   transition(SM, Inv, IM) {
     f_sendAck;
+    forward_eviction_to_cpu;
     l_popForwardQueue;
   }
 
-- 
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