migration.c 1.6 KB

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