void __irq_entry do_IRQ(struct pt_regs *regs)
{
struct tpi_info *tpi_info;
struct subchannel *sch;
struct irb *irb;
struct pt_regs *old_regs;
old_regs = set_irq_regs(regs);
s390_idle_check(regs, S390_lowcore.int_clock,
S390_lowcore.async_enter_timer);
irq_enter();
__get_cpu_var(s390_idle).nohz_delay = 1;
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
/* Serve timer interrupts first. */
clock_comparator_work();
/*
* Get interrupt information from lowcore
*/
tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id;
irb = (struct irb *)&S390_lowcore.irb;
do {
kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
/*
* Non I/O-subchannel thin interrupts are processed differently
*/
if (tpi_info->adapter_IO == 1 &&
tpi_info->int_type == IO_INTERRUPT_TYPE) {
do_adapter_IO(tpi_info->isc);
continue;
}
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (!sch) {
/* Clear pending interrupt condition. */
tsch(tpi_info->schid, irb);
continue;
}
spin_lock(sch->lock);
/* Store interrupt response block to lowcore. */
if (tsch(tpi_info->schid, irb) == 0) {
/* Keep subchannel information word up to date. */
memcpy (&sch->schib.scsw, &irb->scsw,
sizeof (irb->scsw));
/* Call interrupt handler if there is one. */
if (sch->driver && sch->driver->irq)
sch->driver->irq(sch);
}
spin_unlock(sch->lock);
/*
* Are more interrupts pending?
* If so, the tpi instruction will update the lowcore
* to hold the info for the next interrupt.
* We don't do this for VM because a tpi drops the cpu
* out of the sie which costs more cycles than it saves.
*/
} while (MACHINE_IS_LPAR && tpi(NULL) != 0);
irq_exit();
set_irq_regs(old_regs);
}
void __irq_entry do_IRQ(struct pt_regs *regs)
{
struct tpi_info *tpi_info;
struct subchannel *sch;
struct irb *irb;
struct pt_regs *old_regs;
old_regs = set_irq_regs(regs);
irq_enter();
__this_cpu_write(s390_idle.nohz_delay, 1);
if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
clock_comparator_work();
tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id;
irb = (struct irb *)&S390_lowcore.irb;
do {
kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
if (tpi_info->adapter_IO) {
do_adapter_IO(tpi_info->isc);
continue;
}
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (!sch) {
kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++;
tsch(tpi_info->schid, irb);
continue;
}
spin_lock(sch->lock);
if (tsch(tpi_info->schid, irb) == 0) {
memcpy (&sch->schib.scsw, &irb->scsw,
sizeof (irb->scsw));
if (sch->driver && sch->driver->irq)
sch->driver->irq(sch);
else
kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++;
} else
kstat_cpu(smp_processor_id()).irqs[IOINT_CIO]++;
spin_unlock(sch->lock);
} while (MACHINE_IS_LPAR && tpi(NULL) != 0);
irq_exit();
set_irq_regs(old_regs);
}
