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Diffstat (limited to 'arch/powerpc/sysdev/mpic.c')
-rw-r--r--arch/powerpc/sysdev/mpic.c68
1 files changed, 62 insertions, 6 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 8e3478c..b24e1d08 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -563,6 +563,51 @@ static void __init mpic_scan_ht_pics(struct mpic *mpic)
#endif /* CONFIG_MPIC_U3_HT_IRQS */
+#ifdef CONFIG_SMP
+static int irq_choose_cpu(unsigned int virt_irq)
+{
+ cpumask_t mask = irq_desc[virt_irq].affinity;
+ int cpuid;
+
+ if (cpus_equal(mask, CPU_MASK_ALL)) {
+ static int irq_rover;
+ static DEFINE_SPINLOCK(irq_rover_lock);
+ unsigned long flags;
+
+ /* Round-robin distribution... */
+ do_round_robin:
+ spin_lock_irqsave(&irq_rover_lock, flags);
+
+ while (!cpu_online(irq_rover)) {
+ if (++irq_rover >= NR_CPUS)
+ irq_rover = 0;
+ }
+ cpuid = irq_rover;
+ do {
+ if (++irq_rover >= NR_CPUS)
+ irq_rover = 0;
+ } while (!cpu_online(irq_rover));
+
+ spin_unlock_irqrestore(&irq_rover_lock, flags);
+ } else {
+ cpumask_t tmp;
+
+ cpus_and(tmp, cpu_online_map, mask);
+
+ if (cpus_empty(tmp))
+ goto do_round_robin;
+
+ cpuid = first_cpu(tmp);
+ }
+
+ return cpuid;
+}
+#else
+static int irq_choose_cpu(unsigned int virt_irq)
+{
+ return hard_smp_processor_id();
+}
+#endif
#define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
@@ -777,12 +822,18 @@ void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
struct mpic *mpic = mpic_from_irq(irq);
unsigned int src = mpic_irq_to_hw(irq);
- cpumask_t tmp;
+ if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
+ int cpuid = irq_choose_cpu(irq);
+
+ mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
+ } else {
+ cpumask_t tmp;
- cpus_and(tmp, cpumask, cpu_online_map);
+ cpus_and(tmp, cpumask, cpu_online_map);
- mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
- mpic_physmask(cpus_addr(tmp)[0]));
+ mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
+ mpic_physmask(cpus_addr(tmp)[0]));
+ }
}
static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
@@ -1220,6 +1271,7 @@ void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
void __init mpic_init(struct mpic *mpic)
{
int i;
+ int cpu;
BUG_ON(mpic->num_sources == 0);
@@ -1262,6 +1314,11 @@ void __init mpic_init(struct mpic *mpic)
mpic_pasemi_msi_init(mpic);
+ if (mpic->flags & MPIC_PRIMARY)
+ cpu = hard_smp_processor_id();
+ else
+ cpu = 0;
+
for (i = 0; i < mpic->num_sources; i++) {
/* start with vector = source number, and masked */
u32 vecpri = MPIC_VECPRI_MASK | i |
@@ -1272,8 +1329,7 @@ void __init mpic_init(struct mpic *mpic)
continue;
/* init hw */
mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
- mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
- 1 << hard_smp_processor_id());
+ mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
}
/* Init spurious vector */
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