Changeset 845 for branches/reconfiguration/modules/vci_cc_vcache_wrapper/caba/source/src/vci_cc_vcache_wrapper.cpp

Timestamp:

Oct 16, 2014, 10:57:42 AM (10 years ago)

Author:

cfuguet

Message:

reconf: introducing watchdog timer in the vci_cc_vcache_wrapper

• The watchdog timer (r_dcache_miss_wdt) starts counting when there is a READ MISS in the cache.

• It triggers an error to the processor when the waiting cycles are greater than a threshold defined in the reg r_dcache_miss_wdt_max.

File:

• branches/reconfiguration/modules/vci_cc_vcache_wrapper/caba/source/src/vci_cc_vcache_wrapper.cpp (modified) (4 diffs)

branches/reconfiguration/modules/vci_cc_vcache_wrapper/caba/source/src/vci_cc_vcache_wrapper.cpp

@@ -331 +331 @@
       r_dcache_miss_set("r_dcache_miss_set"),
       r_dcache_miss_inval("r_dcache_miss_inval"),
+      r_dcache_miss_wdt_max("r_dcache_miss_wdt_max"),
+      r_dcache_miss_wdt("r_dcache_miss_wdt"),
 
       r_dcache_cc_way("r_dcache_cc_way"),
@@ -811 +813 @@
 
         r_dcache_clack_req         = false;
+
+        // Reset watchdog timer threshold to max value
+        r_dcache_miss_wdt_max      = UINT32_MAX;
 
         // No request from CC_RECEIVE FSM to ICACHE/DCACHE FSMs
@@ -4142 +4147 @@
             r_dcache_miss_set = set;
 
+            // reset to 0 the miss watchdog timer
+            r_dcache_miss_wdt = 0;
+
             if (cleanup)
             {
@@ -4265 +4273 @@
             r_dcache_fsm = DCACHE_CC_CHECK;
             r_dcache_fsm_cc_save = r_dcache_fsm.read();
+            break;
+        }
+
+        // increment MISS watchdog timer for black-hole detection
+        r_dcache_miss_wdt = r_dcache_miss_wdt.read() + 1;
+        if (r_dcache_miss_wdt.read() == r_dcache_miss_wdt_max.read()) {
+            r_mmu_detr   = MMU_READ_DATA_TIMEOUT;
+            r_mmu_dbvar  = r_dcache_save_vaddr.read();
+            m_drsp.valid = true;
+            m_drsp.error = true;
+            r_dcache_fsm = DCACHE_IDLE;
             break;
         }