Changeset 230 for trunk/modules/vci_cc_vcache_wrapper_v4

Timestamp:

May 8, 2012, 12:54:58 PM (13 years ago)

Author:

alain

Message:

Fixing a bug in the LL reservation registration

File:

• trunk/modules/vci_cc_vcache_wrapper_v4/caba/source/src/vci_cc_vcache_wrapper_v4.cpp (modified) (8 diffs)

trunk/modules/vci_cc_vcache_wrapper_v4/caba/source/src/vci_cc_vcache_wrapper_v4.cpp

@@ -689 +689 @@
         r_mmu_mode = 0x3;
 
-        // No request from ICACHE FSM to CMD FSM
+            // No request from ICACHE FSM to CMD FSM
         r_icache_miss_req          = false;
         r_icache_unc_req           = false;
@@ -712 +712 @@
 
         // No LL reservation
-        r_dcache_ll_valid          = false;
+            r_dcache_ll_valid          = false;
 
         // No processor XTN request pending
@@ -1964 +1964 @@
     {
     case DCACHE_IDLE:   // There is 8 conditions to exit the IDLE state :
-                        // 1) Dirty bit update (processor)      => DCACHE_DIRTY_GET_PTE
-                        // 2) Coherence request (TGT FSM)       => DCACHE_CC_CHECK 
-                        // 3) ITLB miss request (ICACHE FSM)    => DCACHE_TLB_MISS
-                        // 4) XTN request (processor)           => DCACHE_XTN_*
-                        // 5) DTLB miss (processor)             => DCACHE_TLB_MISS
-                        // 6) Cacheable read miss (processor)   => DCACHE_MISS_VICTIM
-                        // 7) Uncacheable read (processor)      => DCACHE_UNC_WAIT 
-                        // 8) SC access (processor)             => DCACHE_SC_WAIT
+                                                // 1) Dirty bit update (processor)      => DCACHE_DIRTY_GET_PTE
+                                                // 2) Coherence request (TGT FSM)       => DCACHE_CC_CHECK 
+                                                // 3) ITLB miss request (ICACHE FSM)    => DCACHE_TLB_MISS
+                                                // 4) XTN request (processor)           => DCACHE_XTN_*
+                                                // 5) DTLB miss (processor)             => DCACHE_TLB_MISS
+                                                // 6) Cacheable read miss (processor)   => DCACHE_MISS_VICTIM
+                                                // 7) Uncacheable read (processor)      => DCACHE_UNC_WAIT 
+                                                // 8) SC access (processor)             => DCACHE_SC_WAIT
                         //
                         // The dtlb is unconditionally accessed to translate the
@@ -2532 +2532 @@
                     // If dcache miss, we go to DCACHE_MISS_VICTIM state.
                     // If uncacheable, we go to DCACHE_UNC_WAIT state.
+                    // In case of LL, the LL registration is done when the data is returned:
+                    // in DCACHE_IDLE if cacheable / in DCACHE_UNC_WAIT if uncacheable 
                     if ( ((m_dreq.type == iss_t::DATA_READ) or (m_dreq.type == iss_t::DATA_LL)) 
                         and not r_dcache_p0_valid.read() and not r_dcache_p1_valid.read() )
@@ -2570 +2572 @@
                                 m_drsp.valid   = true;
                                 m_drsp.rdata   = cache_rdata;
+
+                                // makes reservation in case of LL
+                                if ( m_dreq.type == iss_t::DATA_LL )
+                                {
+                                    r_dcache_ll_valid = true;
+                                    r_dcache_ll_vaddr = m_dreq.addr;
+                                    r_dcache_ll_data  = cache_rdata;
+                                }
 #if DEBUG_DCACHE
 if ( m_debug_dcache_fsm )
@@ -2586 +2596 @@
                         }
 
-                        // makes reservation in case of LL
-                        if ( m_dreq.type == iss_t::DATA_LL )
-                        {
-                            r_dcache_ll_valid = true;
-                            r_dcache_ll_data  = cache_rdata;
-                            r_dcache_ll_vaddr = m_dreq.addr;
-                        }
                         r_dcache_p0_valid = false;
                     } // end READ or LL
@@ -2666 +2669 @@
                             {
                                 // The PTE physical address is obtained from the nline value (dtlb),
-                                // and the word index (proper bits of the virtual address)
+                                // and the word index (virtual address)
                                 if ( tlb_flags.b )      // PTE1
                                 {
@@ -3867 +3870 @@
             break;
         }
-        else if ( r_vci_rsp_fifo_dcache.rok() )     // data available
-        {
+            else if ( r_vci_rsp_fifo_dcache.rok() )     // data available
+            {
+            // consume data 
             vci_rsp_fifo_dcache_get = true;     
             r_dcache_fsm            = DCACHE_IDLE;
-            // we acknowledge the processor request if it has not been modified
+
+            // acknowledge the processor request if it has not been modified
             if ( m_dreq.valid and (m_dreq.addr == r_dcache_p0_vaddr.read()) )
             {
-                m_drsp.valid          = true;
-                m_drsp.rdata          = r_vci_rsp_fifo_dcache.read();
-            }
-        }       
+                    m_drsp.valid          = true;
+                    m_drsp.rdata          = r_vci_rsp_fifo_dcache.read();
+
+                // makes reservation in case of LL
+                if ( m_dreq.type == iss_t::DATA_LL )
+                {
+                    r_dcache_ll_valid = true;
+                    r_dcache_ll_data  = r_vci_rsp_fifo_dcache.read();
+                    r_dcache_ll_vaddr = m_dreq.addr;
+                }
+            }
+            }   
         break;
     }