Changeset 291 for trunk/modules/vci_mem_cache_v4/caba/source/include/xram_transaction_v4.h

Timestamp:

Jan 28, 2013, 1:59:32 PM (11 years ago)

Author:

joannou

Message:

Introducing new generic_llsc_local_table and generic_llsc_global_table components :
These two tables implement the new scalable LL/SC mechanism for TSAR.

• generic_llsc_local_table, integrated in the vci_cc_vache_wrapper_v4 component. The table is accessed by the DCACHE_FSM. A two step registration (LL cmd/ LL rsp) sets a signature allocated by the global table for the pending LL/SC operation. An SC operation consumes the registration.
• generic_llsc_global_table, integrated in the vci_mem_cache_v4 component. The table is accessed by the READ_FSM, WRITE_FSM, CAS_FSM, when accessing the directory. It generates a signature for LL registrations and performs SC operation by checking registration's valididty with that signature. SW operations simply invalidate a registrations.

N.B. :

• The sizes of the tables are parameters, and are NOT a function of the architecture's size (scalable mechanism).
• The LL are handled by the MEMCACHE in the READ_FSM.
• The SC are handled by the MEMCACHE in the WRITE_FSM, and are no longer CAS emulated. CAS operation is now only performed by hardware mechanisms.
• An extra field is added to the xram transaction table to save a pending LL's signature.

File:

• trunk/modules/vci_mem_cache_v4/caba/source/include/xram_transaction_v4.h (modified) (5 diffs)

trunk/modules/vci_mem_cache_v4/caba/source/include/xram_transaction_v4.h

@@ -32 +32 @@
     std::vector<be_t>   wdata_be;       // be for each data in the write buffer
     bool                rerror;         // error returned by xram
+    data_t              ll_key;         // LL key returned by the llsc_global_table
 
     /////////////////////////////////////////////////////////////////////
@@ -127 +128 @@
         wdata.assign(source.wdata.begin(),source.wdata.end());  
         rerror      = source.rerror;
+        ll_key      = source.ll_key;
     }
 
@@ -325 +327 @@
     // - data : the data to write (in case of write)
     // - data_be : the mask of the data to write (in case of write)
+    // - ll_key  : the ll key (if any) returned by the llsc_global_table
     /////////////////////////////////////////////////////////////////////
     void set(const size_t index,
@@ -336 +339 @@
             const size_t word_index,
             const std::vector<be_t> &data_be,
-            const std::vector<data_t> &data) 
+            const std::vector<data_t> &data, 
+            const data_t ll_key = 0) 
     {
         assert( (index < size_tab) 
@@ -354 +358 @@
         tab[index].read_length      = read_length;
         tab[index].word_index       = word_index;
+        tab[index].ll_key           = ll_key;
         for(size_t i=0; i<tab[index].wdata.size(); i++) 
         {