Changeset 336 for branches/v5/modules/vci_mem_cache/caba/source/src/vci_mem_cache.cpp

Timestamp:

Mar 27, 2013, 2:25:37 PM (11 years ago)

Author:

cfuguet

Message:

Bug fix in the vci_cc_vcache_wrapper and vci_mem_cache components
(and the corresponding dspin coherence versions)

vci_cc_vcache_wrapper:

In the VCI_CMD FSM of the cc_vcache, for the SC command as for the
CAS command, we must set the CONS bit in the VCI packet. In the
same manner we must unset the CONTIG bit in the VCI packet for these
two commands.
These two kind of commands have two flits with the same VCI address.

vci_mem_cache

In the state WRITE_DIR_REQ, we don't have to rewrite the registers
address or word index because they will be assigned with the correct
values in the WRITE_IDLE or WRITE_RSP states.

File:

• branches/v5/modules/vci_mem_cache/caba/source/src/vci_mem_cache.cpp (modified) (6 diffs)

branches/v5/modules/vci_mem_cache/caba/source/src/vci_mem_cache.cpp

@@ -1793 +1793 @@
         // consume a word in the FIFO & write it in the local buffer
         cmd_write_fifo_get  = true;
-        r_write_pending_sc  = false;
         size_t index        = m_x[(vci_addr_t)(m_cmd_write_addr_fifo.read())];
 
@@ -1803 +1802 @@
         r_write_trdid       = m_cmd_write_trdid_fifo.read();
         r_write_pktid       = m_cmd_write_pktid_fifo.read();
+        r_write_pending_sc  = false;
 
         // initialize the be field for all words
@@ -1860 +1860 @@
         // consume a word in the FIFO & write it in the local buffer
         cmd_write_fifo_get  = true;
-        r_write_pending_sc  = false;
         size_t index        = r_write_word_index.read() + r_write_word_count.read();
 
@@ -1877 +1876 @@
     ////////////////////
     case WRITE_DIR_REQ:
-    // Get the lock to the directory
     {
-      if ( r_alloc_dir_fsm.read() == ALLOC_DIR_WRITE )
-      {
-        if(((r_write_pktid.read() & 0x7) == TYPE_SC) && not r_write_pending_sc.read()) // check for an SC command (and check that its second flit is not already consumed)
-        {
-          if ( m_cmd_write_addr_fifo.rok() )
-          {
-            size_t index    = m_x[(vci_addr_t)(r_write_address.read())];
-            bool sc_success = m_llsc_table.sc(r_write_address.read(),r_write_data[index].read());
-            r_write_sc_fail = !sc_success;
-
-            assert(m_cmd_write_eop_fifo.read() && "Error in VCI_MEM_CACHE : invalid packet format for SC command");
-            // consume a word in the FIFO & write it in the local buffer
-            cmd_write_fifo_get  = true;
-            r_write_pending_sc  = true;
-            index               = m_x[(vci_addr_t)(m_cmd_write_addr_fifo.read())];
-
-            r_write_address     = (addr_t)(m_cmd_write_addr_fifo.read());
-            r_write_word_index  = index;
-            r_write_word_count  = 1;
-            r_write_data[index] = m_cmd_write_data_fifo.read();
-            if (!sc_success)
-            {
-              r_write_fsm = WRITE_RSP;
-              break;
-            }
-          }
-          else break;
-        }
-        //else it is a TYPE_WRITE, need a simple sw access to the
-        // llsc_global_table
-        else
-        {
-          m_llsc_table.sw(r_write_address.read());
-        }
+      // Get the lock to the directory
+      // and access the llsc_global_table
+      if(r_alloc_dir_fsm.read() == ALLOC_DIR_WRITE)
+      {
+        ///////////////////////////////////////////////////////////////////////
+        // SC command treatment
+        // We test the r_write_pending_sc register to know if we are returning
+        // from the WAIT state.
+        // In this case, the SC has already succeed and we cannot consume
+        // another time from the FIFO. Also, we don't have to test another
+        // time if the SC has succeed
+        if(((r_write_pktid.read() & 0x7) == TYPE_SC) and not r_write_pending_sc.read())
+        {
+          if(not m_cmd_write_addr_fifo.rok()) break;
+
+          assert(m_cmd_write_eop_fifo.read() &&
+                 "Error in VCI_MEM_CACHE : "
+                 "invalid packet format for SC command");
+
+          size_t index    = r_write_word_index.read();
+          bool sc_success = m_llsc_table.sc(r_write_address.read()    ,
+                                            r_write_data[index].read());
+
+          // consume a word in the FIFO & write it in the local buffer
+          cmd_write_fifo_get  = true;
+          r_write_data[index] = m_cmd_write_data_fifo.read();
+          r_write_sc_fail     = not sc_success;
+          r_write_pending_sc  = true;
+
+          if(not sc_success) r_write_fsm = WRITE_RSP;
+          else               r_write_fsm = WRITE_DIR_LOCK;
+
+          break;
+        }
+
+        ///////////////////////////////////////////////////////////////////////
+        // WRITE command or SC command treatment returning from the WAIT state
+        // In the second case, we must access the LL/SC global table to
+        // erase any possible new reservation when we release the lock on the
+        // directory
+        m_llsc_table.sw(r_write_address.read());
+
         r_write_fsm = WRITE_DIR_LOCK;
       }
 
 #if DEBUG_MEMC_WRITE
-      if( m_debug_write_fsm )
-      {
-        std::cout 
-          << "  <MEMC " << name() << ".WRITE_DIR_REQ> Requesting DIR lock "
-          << std::endl;
+      if(m_debug_write_fsm)
+      {
+        std::cout
+            << "  <MEMC " << name() << ".WRITE_DIR_REQ> Requesting DIR lock "
+            << std::endl;
       }
 #endif
@@ -2392 +2398 @@
           // consume a word in the FIFO & write it in the local buffer
           cmd_write_fifo_get  = true;
-          r_write_pending_sc  = false;
           size_t index        = m_x[(vci_addr_t)(m_cmd_write_addr_fifo.read())];
 
@@ -2402 +2407 @@
           r_write_trdid       = m_cmd_write_trdid_fifo.read();
           r_write_pktid       = m_cmd_write_pktid_fifo.read();
+          r_write_pending_sc  = false;
 
           // initialize the be field for all words