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[PARISC] Add IRQ affinities

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This really only adds them for the machines I can check SMP on, which
is CPU interrupts and IOSAPIC (so not any of the GSC based machines).

With this patch, irqbalanced can be used to maintain irq balancing.
Unfortunately, irqbalanced is a bit x86 centric, so it doesn't do an
incredibly good job, but it does work.

Signed-off-by: James Bottomley <jejb@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
James Bottomley
2005-11-17 16:28:37 -05:00
committed by Kyle McMartin
parent 1d4c452a85
commit c2ab64d098
3 changed files with 86 additions and 5 deletions
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26
drivers/parisc/iosapic.c
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@@ -700,6 +700,28 @@ static unsigned int iosapic_startup_irq(unsigned int irq)
return 0;
}
#ifdef CONFIG_SMP
static void iosapic_set_affinity_irq(unsigned int irq, cpumask_t dest)
{
struct vector_info *vi = iosapic_get_vector(irq);
u32 d0, d1, dummy_d0;
unsigned long flags;
if (cpu_check_affinity(irq, &dest))
return;
vi->txn_addr = txn_affinity_addr(irq, first_cpu(dest));
spin_lock_irqsave(&iosapic_lock, flags);
/* d1 contains the destination CPU, so only want to set that
* entry */
iosapic_rd_irt_entry(vi, &d0, &d1);
iosapic_set_irt_data(vi, &dummy_d0, &d1);
iosapic_wr_irt_entry(vi, d0, d1);
spin_unlock_irqrestore(&iosapic_lock, flags);
}
#endif
static struct hw_interrupt_type iosapic_interrupt_type = {
.typename = "IO-SAPIC-level",
.startup = iosapic_startup_irq,
@@ -708,7 +730,9 @@ static struct hw_interrupt_type iosapic_interrupt_type = {
.disable = iosapic_disable_irq,
.ack = no_ack_irq,
.end = iosapic_end_irq,
// .set_affinity = iosapic_set_affinity_irq,
#ifdef CONFIG_SMP
.set_affinity = iosapic_set_affinity_irq,
#endif
};
int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev)