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s390: add machine check SIGP

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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>
This commit is contained in:
Sven Schnelle 2020-03-17 13:37:49 +01:00 committed by Vasily Gorbik
parent a999eb96fd
commit 11886c199d
2 changed files with 9 additions and 0 deletions
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1
arch/s390/include/asm/smp.h
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@ -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 */

8
arch/s390/kernel/smp.c
View file

@ -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,