From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- kernel/irq/migration.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 kernel/irq/migration.c (limited to 'kernel/irq/migration.c') diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c new file mode 100644 index 000000000..ca3f4aaff --- /dev/null +++ b/kernel/irq/migration.c @@ -0,0 +1,72 @@ + +#include +#include + +#include "internals.h" + +void irq_move_masked_irq(struct irq_data *idata) +{ + struct irq_desc *desc = irq_data_to_desc(idata); + struct irq_chip *chip = idata->chip; + + if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) + return; + + /* + * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. + */ + if (!irqd_can_balance(&desc->irq_data)) { + WARN_ON(1); + return; + } + + irqd_clr_move_pending(&desc->irq_data); + + if (unlikely(cpumask_empty(desc->pending_mask))) + return; + + if (!chip->irq_set_affinity) + return; + + assert_raw_spin_locked(&desc->lock); + + /* + * 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 coming 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 (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids) + irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false); + + cpumask_clear(desc->pending_mask); +} + +void irq_move_irq(struct irq_data *idata) +{ + bool masked; + + if (likely(!irqd_is_setaffinity_pending(idata))) + return; + + if (unlikely(irqd_irq_disabled(idata))) + return; + + /* + * Be careful vs. already masked interrupts. If this is a + * threaded interrupt with ONESHOT set, we can end up with an + * interrupt storm. + */ + masked = irqd_irq_masked(idata); + if (!masked) + idata->chip->irq_mask(idata); + irq_move_masked_irq(idata); + if (!masked) + idata->chip->irq_unmask(idata); +} -- cgit v1.2.3