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powerpc/pseries/dlpar: handle ibm, configure-connector delay status 

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: ab519a011c ("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
This commit is contained in:
Nathan Lynch 2021-01-06 20:59:00 -06:00 committed by Michael Ellerman
parent 3cb1aa7aa3
commit 768d70e19b
1 changed files with 3 additions and 4 deletions
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7
arch/powerpc/platforms/pseries/dlpar.c
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@ -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,
last_dn = last_dn->parent;
break;
case CALL_AGAIN:
break;
case MORE_MEMORY:
case ERR_CFG_USE:
default: