From 331b4bff6cb94d3578243089c2adcf3908058d63 Mon Sep 17 00:00:00 2001
From: Bill Hoffa <wghoffa@us.ibm.com>
Date: Mon, 23 Jul 2018 10:34:32 -0500
Subject: Restore Timebase on Master Core Threads 1-3 after Sleep/Winkle

Change-Id: I329dd64345f2474cb0dad628ccc2244d85be86c2
CQ: SW429364
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/63147
Reviewed-by: ILYA SMIRNOV <ismirno@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Prachi Gupta <pragupta@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
---
 src/kernel/cpumgr.C   |  1 +
 src/kernel/doorbell.C | 14 ++++++++++++++
 src/kernel/misc.C     |  4 +---
 src/kernel/workitem.C | 15 +++++++++++++++
 4 files changed, 31 insertions(+), 3 deletions(-)

(limited to 'src/kernel')

diff --git a/src/kernel/cpumgr.C b/src/kernel/cpumgr.C
index 095b0a946..6ef08051c 100644
--- a/src/kernel/cpumgr.C
+++ b/src/kernel/cpumgr.C
@@ -253,6 +253,7 @@ void CpuManager::startCPU(ssize_t i)
         cpu->idle_task = TaskManager::createIdleTask();
         cpu->idle_task->cpu = cpu;
         cpu->periodic_count = 0;
+        cpu->cpu_restore_tb = 0;
 
         // Call TimeManager setup for a CPU.
         TimeManager::init_cpu(cpu);
diff --git a/src/kernel/doorbell.C b/src/kernel/doorbell.C
index e746ab8cb..c24ee1384 100644
--- a/src/kernel/doorbell.C
+++ b/src/kernel/doorbell.C
@@ -79,6 +79,20 @@ void send_doorbell_wakeup(uint64_t i_pir)
     doorbell_send(i_pir);
 }
 
+void send_doorbell_restore_tb(uint64_t i_pir, uint64_t i_tb)
+{
+    cpu_t *l_cpu = CpuManager::getCpu(i_pir);
+    l_cpu->cpu_restore_tb = i_tb;
+
+    printkd("send_doorbell_restore_tb to pir: %lx\n", i_pir);
+    //Create WorkItem and put on the stack to be executed during doorbell
+    // execution
+    KernelWorkItem* l_work = new CpuTbRestoreDoorbellWorkItem();
+    l_cpu->doorbell_actions.push(l_work);
+    //Send doorbell to wakeup core/thread
+    doorbell_send(i_pir);
+}
+
 void send_doorbell_ipc(uint64_t i_pir)
 {
     printk("send_doorbell_ipc to pir: %lx\n", i_pir);
diff --git a/src/kernel/misc.C b/src/kernel/misc.C
index 9f21fe75b..c770fc49f 100644
--- a/src/kernel/misc.C
+++ b/src/kernel/misc.C
@@ -348,7 +348,7 @@ namespace KernelMisc
                 // NOTE: The deferred work container verifies master core
                 // threads 1-3 wake up so a direct doorbell can be sent. For
                 // threads on other cores send_doorbell_wakeup() is used.
-                doorbell_send(l_pir + i);
+                send_doorbell_restore_tb(l_pir + i, iv_timebase);
             }
         }
 
@@ -358,7 +358,6 @@ namespace KernelMisc
         {
             cpu->scheduler->setNextRunnable();
         }
-
     }
 
     void WinkleCore::masterPostWork()
@@ -465,7 +464,6 @@ namespace KernelMisc
         {
             cpu->scheduler->setNextRunnable();
         }
-
     }
 
     void WinkleAll::masterPostWork()
diff --git a/src/kernel/workitem.C b/src/kernel/workitem.C
index 0edf83083..53f91cb3b 100644
--- a/src/kernel/workitem.C
+++ b/src/kernel/workitem.C
@@ -27,6 +27,7 @@
 #include <kernel/workitem.H>
 #include <kernel/console.H>
 #include <kernel/intmsghandler.H>
+#include <kernel/cpumgr.H>
 
 //Define the desired behavior for a CPU core/thread
 // wakeup scenario
@@ -40,3 +41,17 @@ void CpuWakeupDoorbellWorkItem::operator() (void)
     InterruptMsgHdlr::sendThreadWakeupMsg(pir);
     return;
 }
+
+void CpuTbRestoreDoorbellWorkItem::operator() (void)
+{
+    size_t pir = getPIR();
+    cpu_t *l_cpu = CpuManager::getCpu(pir);
+
+    uint64_t l_restore_tb = l_cpu->cpu_restore_tb;
+    printkd("pir:%ld tb:0x%0x\n", pir, l_restore_tb);
+    if (l_restore_tb > getTB())
+    {
+        setTB(l_restore_tb);
+    }
+    return;
+}
-- 
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