From 768d70e19ba525debd571b36e6d0ab19956c63d7 Mon Sep 17 00:00:00 2001
From: Nathan Lynch <nathanl@linux.ibm.com>
Date: Wed, 6 Jan 2021 20:59:00 -0600
Subject: [PATCH] powerpc/pseries/dlpar: handle ibm, configure-connector delay
status
References: bsc#1181985 ltc#188074
Patch-mainline: v5.12-rc1
Git-commit: 768d70e19ba525debd571b36e6d0ab19956c63d7
dlpar_configure_connector() has two problems in its handling of
ibm,configure-connector's return status:
1. When the status is -2 (busy, call again), we call
ibm,configure-connector again immediately without checking whether
to schedule, which can result in monopolizing the CPU.
2. Extended delay status (9900..9905) goes completely unhandled,
causing the configuration to unnecessarily terminate.
Fix both of these issues by using rtas_busy_delay().
Fixes: ab519a011caa ("powerpc/pseries: Kernel DLPAR Infrastructure")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210107025900.410369-1-nathanl@linux.ibm.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/platforms/pseries/dlpar.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -127,7 +127,6 @@ void dlpar_free_cc_nodes(struct device_node *dn)
#define NEXT_PROPERTY 3
#define PREV_PARENT 4
#define MORE_MEMORY 5
-#define CALL_AGAIN -2
#define ERR_CFG_USE -9003
struct device_node *dlpar_configure_connector(__be32 drc_index,
@@ -168,6 +167,9 @@ struct device_node *dlpar_configure_connector(__be32 drc_index,
spin_unlock(&rtas_data_buf_lock);
+ if (rtas_busy_delay(rc))
+ continue;
+
switch (rc) {
case COMPLETE:
break;
@@ -216,9 +218,6 @@ struct device_node *dlpar_configure_connector(__be32 drc_index,
parent_path = last_dn->parent->full_name;
break;
- case CALL_AGAIN:
- break;
-
case MORE_MEMORY:
case ERR_CFG_USE:
default:
--
2.26.2