LXR linux/kernel/irq/migration.c

   1
   2#include <linux/irq.h>
   3#include <linux/interrupt.h>
   4
   5#include "internals.h"
   6
   7void move_masked_irq(int irq)
   8{
   9        struct irq_desc *desc = irq_to_desc(irq);
  10
  11        if (likely(!(desc->status & IRQ_MOVE_PENDING)))
  12                return;
  13
  14        /*
  15         * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
  16         */
  17        if (CHECK_IRQ_PER_CPU(desc->status)) {
  18                WARN_ON(1);
  19                return;
  20        }
  21
  22        desc->status &= ~IRQ_MOVE_PENDING;
  23
  24        if (unlikely(cpumask_empty(desc->pending_mask)))
  25                return;
  26
  27        if (!desc->chip->set_affinity)
  28                return;
  29
  30        assert_spin_locked(&desc->lock);
  31
  32        /*
  33         * If there was a valid mask to work with, please
  34         * do the disable, re-program, enable sequence.
  35         * This is *not* particularly important for level triggered
  36         * but in a edge trigger case, we might be setting rte
  37         * when an active trigger is comming in. This could
  38         * cause some ioapics to mal-function.
  39         * Being paranoid i guess!
  40         *
  41         * For correct operation this depends on the caller
  42         * masking the irqs.
  43         */
  44        if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
  45                   < nr_cpu_ids))
  46                if (!desc->chip->set_affinity(irq, desc->pending_mask)) {
  47                        cpumask_copy(desc->affinity, desc->pending_mask);
  48                        irq_set_thread_affinity(desc);
  49                }
  50
  51        cpumask_clear(desc->pending_mask);
  52}
  53
  54void move_native_irq(int irq)
  55{
  56        struct irq_desc *desc = irq_to_desc(irq);
  57
  58        if (likely(!(desc->status & IRQ_MOVE_PENDING)))
  59                return;
  60
  61        if (unlikely(desc->status & IRQ_DISABLED))
  62                return;
  63
  64        desc->chip->mask(irq);
  65        move_masked_irq(irq);
  66        desc->chip->unmask(irq);
  67}
  68
  69