[Skiboot] [PATCH] SCOM Restore: Increased the EQ SCOM restore limit.

[Stewart Smith]

From: Prem Shanker Jha <premjha2 at in.ibm.com>

Commit increases the SCOM restore limit from 16 to 31.

HW-Image-Prereq: I781b0862dc983001574ba5f09a84ea0a2f7f781f
HW-ImageBuild-Prereq: I43e7e067b59513db1c99ce913009a9a3ef5de90b
CQ:HW423686
Change-Id: Ied6c919ff88870cd71319854a2b6aebbcc591af1
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/49055
Dev-Ready: Gregory S. Still <stillgs at us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot at us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot at us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot at us.ibm.com>
Reviewed-by: Gregory S. Still <stillgs at us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer at us.ibm.com>
(cherry picked from hostboot https://ralgit01.raleigh.ibm.com/gerrit1/#/c/49059/ )
[stewart: I am told that this is a safe thing to cherry-pick now,
even before it hits hostboot master, as hostboot and HCODE have a
dependency]
CC: stable
Signed-off-by: Stewart Smith <stewart at linux.vnet.ibm.com>
---
 libpore/p9_hcd_memmap_base.H | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/libpore/p9_hcd_memmap_base.H b/libpore/p9_hcd_memmap_base.H
index 852692b6f471..7073841856dc 100644
--- a/libpore/p9_hcd_memmap_base.H
+++ b/libpore/p9_hcd_memmap_base.H
@@ -261,7 +261,22 @@ HCD_CONST(QUAD_SCOM_RESTORE_HOMER_OFFSET,
 
 HCD_CONST(MAX_L2_SCOM_ENTRIES,                  16)
 HCD_CONST(MAX_L3_SCOM_ENTRIES,                  16)
-HCD_CONST(MAX_EQ_SCOM_ENTRIES,                  15)
+
+//HW423686
+//Inorder to continue IMA after STOP11 on all four cores of a quad, 2
+//EQ SCOM registers need to restored per core. STOP API desgin allowed
+//only 15 SCOM restore entries per EQ. Out of total budget, 12 are
+//consumed during IPL. Hence it was not possible to manage IMA within
+//this limit. As a resolution, limit for EQ SCOM restore entries has
+//been changed to 31. Below is the break down for EQ SCOM Restore
+//Entries
+
+// Power Management         12
+// Core IMA                 08
+// PRD FIR Mask             05
+// Reserve                  06
+
+HCD_CONST(MAX_EQ_SCOM_ENTRIES,                  31)
 HCD_CONST(QUAD_SCOM_RESTORE_REGS_PER_QUAD,
           (MAX_EQ_SCOM_ENTRIES + MAX_L2_SCOM_ENTRIES + MAX_L3_SCOM_ENTRIES + 1))
 
-- 
2.14.3