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[S390] irq: fix service signal external interrupt handling

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Interrupt sources like pfault, sclp, dasd_diag and virtio all use the
service signal external interrupt subclass mask in control register 0
to enable and disable the corresponding interrupt.
Because no reference counting is implemented each subsystem thinks it
is the only user of subclass and sets and clears the bit like it wants.
This leads to case that unloading the dasd diag module under z/VM
causes both sclp and pfault interrupts to be masked. The result will
be locked up system sooner or later.
Fix this by introducing a new way to set (register) and clear
(unregister) the service signal subclass mask bit in cr0.
Also convert all drivers.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2011-05-26 09:48:23 +02:00
parent 902050bcde
commit df7997ab1c
6 changed files with 32 additions and 7 deletions
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2
arch/s390/include/asm/s390_ext.h
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@ -13,5 +13,7 @@ typedef void (*ext_int_handler_t)(unsigned int, unsigned int, unsigned long);
int register_external_interrupt(__u16 code, ext_int_handler_t handler);
int unregister_external_interrupt(__u16 code, ext_int_handler_t handler);
void service_subclass_irq_register(void);
void service_subclass_irq_unregister(void);
#endif /* _S390_EXTINT_H */

23
arch/s390/kernel/s390_ext.c
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@ -106,3 +106,26 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code,
irq_exit();
set_irq_regs(old_regs);
}
static DEFINE_SPINLOCK(sc_irq_lock);
static int sc_irq_refcount;
void service_subclass_irq_register(void)
{
spin_lock(&sc_irq_lock);
if (!sc_irq_refcount)
ctl_set_bit(0, 9);
sc_irq_refcount++;
spin_unlock(&sc_irq_lock);
}
EXPORT_SYMBOL(service_subclass_irq_register);
void service_subclass_irq_unregister(void)
{
spin_lock(&sc_irq_lock);
sc_irq_refcount--;
if (!sc_irq_refcount)
ctl_clear_bit(0, 9);
spin_unlock(&sc_irq_lock);
}
EXPORT_SYMBOL(service_subclass_irq_unregister);

2
arch/s390/mm/fault.c
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@ -613,7 +613,7 @@ static int __init pfault_irq_init(void)
rc = pfault_init() == 0 ? 0 : -EOPNOTSUPP;
if (rc)
goto out_pfault;
ctl_set_bit(0, 9);
service_subclass_irq_register();
hotcpu_notifier(pfault_cpu_notify, 0);
return 0;

4
drivers/s390/block/dasd_diag.c
View File

@ -642,7 +642,7 @@ dasd_diag_init(void)
}
ASCEBC(dasd_diag_discipline.ebcname, 4);
ctl_set_bit(0, 9);
service_subclass_irq_register();
register_external_interrupt(0x2603, dasd_ext_handler);
dasd_diag_discipline_pointer = &dasd_diag_discipline;
return 0;
@ -652,7 +652,7 @@ static void __exit
dasd_diag_cleanup(void)
{
unregister_external_interrupt(0x2603, dasd_ext_handler);
ctl_clear_bit(0, 9);
service_subclass_irq_unregister();
dasd_diag_discipline_pointer = NULL;
}

6
drivers/s390/char/sclp.c
View File

@ -885,12 +885,12 @@ sclp_check_interface(void)
spin_unlock_irqrestore(&sclp_lock, flags);
/* Enable service-signal interruption - needs to happen
* with IRQs enabled. */
ctl_set_bit(0, 9);
service_subclass_irq_register();
/* Wait for signal from interrupt or timeout */
sclp_sync_wait();
/* Disable service-signal interruption - needs to happen
* with IRQs enabled. */
ctl_clear_bit(0,9);
service_subclass_irq_unregister();
spin_lock_irqsave(&sclp_lock, flags);
del_timer(&sclp_request_timer);
if (sclp_init_req.status == SCLP_REQ_DONE &&
@ -1070,7 +1070,7 @@ sclp_init(void)
spin_unlock_irqrestore(&sclp_lock, flags);
/* Enable service-signal external interruption - needs to happen with
* IRQs enabled. */
ctl_set_bit(0, 9);
service_subclass_irq_register();
sclp_init_mask(1);
return 0;

2
drivers/s390/kvm/kvm_virtio.c
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@ -441,7 +441,7 @@ static int __init kvm_devices_init(void)
INIT_WORK(&hotplug_work, hotplug_devices);
ctl_set_bit(0, 9);
service_subclass_irq_register();
register_external_interrupt(0x2603, kvm_extint_handler);
scan_devices();