From 11886c199d8d62e2469cb404235a4ee7266f01c7 Mon Sep 17 00:00:00 2001
From: Sven Schnelle <svens@linux.ibm.com>
Date: Tue, 17 Mar 2020 13:37:49 +0100
Subject: [PATCH] s390: add machine check SIGP
This will be used with the upcoming entry.S changes to signal
that there's a machine check pending that cannot be handled in
the Machine check handler itself.
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---
arch/s390/include/asm/smp.h | 1 +
arch/s390/kernel/smp.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
index 231a51e870fe4..7326f110d48c2 100644
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -58,5 +58,6 @@ extern int smp_rescan_cpus(void);
extern void __noreturn cpu_die(void);
extern void __cpu_die(unsigned int cpu);
extern int __cpu_disable(void);
+extern void schedule_mcck_handler(void);
#endif /* __ASM_SMP_H */
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 7eaabbab22134..fc1041257c60d 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -61,6 +61,7 @@ enum {
ec_schedule = 0,
ec_call_function_single,
ec_stop_cpu,
+ ec_mcck_pending,
};
enum {
@@ -403,6 +404,11 @@ int smp_find_processor_id(u16 address)
return -1;
}
+void schedule_mcck_handler(void)
+{
+ pcpu_ec_call(pcpu_devices + smp_processor_id(), ec_mcck_pending);
+}
+
bool arch_vcpu_is_preempted(int cpu)
{
if (test_cpu_flag_of(CIF_ENABLED_WAIT, cpu))
@@ -497,6 +503,8 @@ static void smp_handle_ext_call(void)
scheduler_ipi();
if (test_bit(ec_call_function_single, &bits))
generic_smp_call_function_single_interrupt();
+ if (test_bit(ec_mcck_pending, &bits))
+ s390_handle_mcck();
}
static void do_ext_call_interrupt(struct ext_code ext_code,
--
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