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[PARISC] Allow nested interrupts

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Our prior mode of operation didn't allow nested interrupts
because it makes the interrupt code much simpler.  However,
nested interrupts are better for latency.

This code uses the EIEM register to simulate level interrupts
and thus achieve nesting.

Signed-off-by: James Bottomley <[email protected]>
Signed-off-by: Kyle McMartin <[email protected]>
This commit is contained in:
James Bottomley 2006-09-09 12:36:25 -07:00 • committed by Matthew Wilcox
commit 7085689ed1
4 changed files with 93 additions and 64 deletions
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3
drivers/parisc/iosapic.c
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@ -692,6 +692,7 @@ static void iosapic_end_irq(unsigned int irq)
DBG(KERN_DEBUG "end_irq(%d): eoi(%p, 0x%x)\n", irq,
vi->eoi_addr, vi->eoi_data);
iosapic_eoi(vi->eoi_addr, vi->eoi_data);
cpu_end_irq(irq);
}
static unsigned int iosapic_startup_irq(unsigned int irq)
@ -728,7 +729,7 @@ static struct hw_interrupt_type iosapic_interrupt_type = {
.shutdown = iosapic_disable_irq,
.enable = iosapic_enable_irq,
.disable = iosapic_disable_irq,
.ack = no_ack_irq,
.ack = cpu_ack_irq,
.end = iosapic_end_irq,
#ifdef CONFIG_SMP
.set_affinity = iosapic_set_affinity_irq,