xiaomi-sm8450/android_kernel_xiaomi_sm8450
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کد مسائل تقاضاهای واکشی Actions Packages پروژه‌ها انتشارها دانشنامه فعالیت

s390/irq: store interrupt information in pt_regs

فهرست منبع 
Copy the interrupt parameters from the lowcore to the pt_regs structure
in entry[64].S and reduce the arguments of the low level interrupt handler
to the pt_regs pointer only. In addition move the test-pending-interrupt
loop from do_IRQ to entry[64].S to make sure that interrupt information
is always delivered via pt_regs.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2013-06-17 14:54:02 +02:00
والد 4bdb613ff4
کامیت 48f6b00c6e
7فایلهای تغییر یافته به همراه58 افزوده شده و 50 حذف شده
دانلود پرونده وصله دانلود فایل تغییرات diff Expand all files Collapse all files

68
drivers/s390/cio/cio.c
مشاهده پرونده

@@ -568,7 +568,7 @@ out:
*/
void __irq_entry do_IRQ(struct pt_regs *regs)
{
struct tpi_info *tpi_info;
struct tpi_info *tpi_info = (struct tpi_info *) &regs->int_code;
struct subchannel *sch;
struct irb *irb;
struct pt_regs *old_regs;
@@ -579,46 +579,34 @@ void __irq_entry do_IRQ(struct pt_regs *regs)
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_incr_irqs_this_cpu(IO_INTERRUPT, NULL);
if (tpi_info->adapter_IO) {
do_adapter_IO(tpi_info->isc);
continue;
}
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (!sch) {
/* Clear pending interrupt condition. */
kstat_incr_irqs_this_cpu(IO_INTERRUPT, NULL);
irb = (struct irb *) &S390_lowcore.irb;
if (tpi_info->adapter_IO) {
do_adapter_IO(tpi_info->isc);
goto out;
}
sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
if (!sch) {
/* Clear pending interrupt condition. */
inc_irq_stat(IRQIO_CIO);
tsch(tpi_info->schid, irb);
goto out;
}
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);
else
inc_irq_stat(IRQIO_CIO);
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);
else
inc_irq_stat(IRQIO_CIO);
} else
inc_irq_stat(IRQIO_CIO);
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);
} else
inc_irq_stat(IRQIO_CIO);
spin_unlock(sch->lock);
out:
irq_exit();
set_irq_regs(old_regs);
}