Adding attribute to turn memory early data on

Performance wants a way to turn memory early data on & off
using just scoms. Adding one attribute to control all the needed
scoms and defaulting everything so that early data is off.

For the L3 disable cp_me by default using scom

Changing the scom cp_me dial to disable cp_me for all systems
after Nimbus DD2.0. This is expected to be the correct setup
for most systems.

We didn't disable the cp_me at the scan, because the scom can
only disable cp_me if ON or allow the scan setting if set OFF. Some
systems might want cp_me enabled by only changing a scom. So the default
is to set cp_me on at the scan and off a the scom. This way only the
scom has to be turned off to enable cp_me.

Also update three scoms in the memory controler that are needed for
early data.

Change-Id: Ib2106ec4b7d26cb084601f2d6eee68833b36d30b
CQ: HW426419
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/49261
Reviewed-by: Joseph J. McGill <jmcgill@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/49332
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/import/chips/p9/procedures/xml/attribute_info/nest_attributes.xml b/src/import/chips/p9/procedures/xml/attribute_info/nest_attributes.xml
index 9929b61ce..86dff9770 100644
--- a/src/import/chips/p9/procedures/xml/attribute_info/nest_attributes.xml
+++ b/src/import/chips/p9/procedures/xml/attribute_info/nest_attributes.xml
@@ -1347,6 +1347,21 @@
   <persistRuntime/>
   <initToZero/>
 </attribute>
+<!-- ******************************************************************** -->
+<attribute>
+  <id>ATTR_ENABLE_MEM_EARLY_DATA_SCOM</id>
+  <targetType>TARGET_TYPE_SYSTEM</targetType>
+  <description>
+    Enable early data from Memory. This also enable cp_me from L3.
+  </description>
+  <valueType>uint8</valueType>
+  <enum>
+    OFF = 0x0,
+    ON = 0x1
+  </enum>
+  <platInit/>
+  <initToZero/>
+</attribute>
 <!-- ********************************************************************** -->
 
 </attributes>