diff options
Diffstat (limited to 'kernel/irq/migration.c')
-rw-r--r-- | kernel/irq/migration.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c new file mode 100644 index 0000000..9db681d --- /dev/null +++ b/kernel/irq/migration.c @@ -0,0 +1,64 @@ + +#include <linux/irq.h> + +void move_masked_irq(int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + cpumask_t tmp; + + if (likely(!(desc->status & IRQ_MOVE_PENDING))) + return; + + /* + * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. + */ + if (CHECK_IRQ_PER_CPU(desc->status)) { + WARN_ON(1); + return; + } + + desc->status &= ~IRQ_MOVE_PENDING; + + if (unlikely(cpus_empty(desc->pending_mask))) + return; + + if (!desc->chip->set_affinity) + return; + + assert_spin_locked(&desc->lock); + + cpus_and(tmp, desc->pending_mask, cpu_online_map); + + /* + * If there was a valid mask to work with, please + * do the disable, re-program, enable sequence. + * This is *not* particularly important for level triggered + * but in a edge trigger case, we might be setting rte + * when an active trigger is comming in. This could + * cause some ioapics to mal-function. + * Being paranoid i guess! + * + * For correct operation this depends on the caller + * masking the irqs. + */ + if (likely(!cpus_empty(tmp))) { + desc->chip->set_affinity(irq,tmp); + } + cpus_clear(desc->pending_mask); +} + +void move_native_irq(int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + + if (likely(!(desc->status & IRQ_MOVE_PENDING))) + return; + + if (unlikely(desc->status & IRQ_DISABLED)) + return; + + desc->chip->mask(irq); + move_masked_irq(irq); + desc->chip->unmask(irq); +} + |