Workaround SBE interupt injection bug on multi-node

Change-Id: Ib17ae25542100c88fd5e85add362876582ea4449
CQ: SW274682
Backport: release-fips820
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/13224
Tested-by: Jenkins Server
Reviewed-by: Douglas R. Gilbert <dgilbert@us.ibm.com>
Reviewed-by: Thi N. Tran <thi@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/usr/hwpf/hwp/core_activate/core_activate.C b/src/usr/hwpf/hwp/core_activate/core_activate.C
index 7e37a4609..934345ef3 100644
--- a/src/usr/hwpf/hwp/core_activate/core_activate.C
+++ b/src/usr/hwpf/hwp/core_activate/core_activate.C
@@ -160,6 +160,22 @@ void*    call_host_activate_master( void    *io_pArgs )
                        "proc_prep_master_winkle SUCCESS"  );
         }
 
+        //Because of a bug in how the SBE injects the IPI used to wake
+        //up the master core, need to ensure no mailbox traffic
+        //or even an interrupt in the interrupt presenter
+        // 1) suspend the mailbox with interrupt disable
+        // 2) ensure that interrupt presenter is drained
+        l_errl = MBOX::suspend(true, true);
+        if (l_errl)
+        {
+            TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace,
+                       "call_host_activate_master ERROR : MBOX::suspend");
+            break;
+        }
+
+        TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace, "drainging interrupt Q");
+        INTR::drainQueue();
+
 
         // Call p8_block_wakeup_intr to prevent stray interrupts from
         // popping core out of winkle before SBE sees it.
@@ -254,6 +270,15 @@ void*    call_host_activate_master( void    *io_pArgs )
         TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace,
                    "Returned from Winkle." );
 
+        //Re-enable the mailbox
+        l_errl = MBOX::resume();
+        if (l_errl)
+        {
+            TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace,
+                       "call_host_activate_master ERROR : MBOX::resume");
+            break;
+        }
+
         TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace,
                    "Call proc_stop_deadman_timer. Target %.8X",
                     TARGETING::get_huid(l_cpu_target) );