1 2 #include <linux/irq.h> 3 #include <linux/interrupt.h> 4 5 #include "internals.h" 6 7 void irq_move_masked_irq(struct irq_data *idata) 8 { 9 struct irq_desc *desc = irq_data_to_desc(idata); 10 struct irq_chip *chip = idata->chip; 11 12 if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) 13 return; 14 15 /* 16 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. 17 */ 18 if (!irqd_can_balance(&desc->irq_data)) { 19 WARN_ON(1); 20 return; 21 } 22 23 irqd_clr_move_pending(&desc->irq_data); 24 25 if (unlikely(cpumask_empty(desc->pending_mask))) 26 return; 27 28 if (!chip->irq_set_affinity) 29 return; 30 31 assert_raw_spin_locked(&desc->lock); 32 33 /* 34 * If there was a valid mask to work with, please 35 * do the disable, re-program, enable sequence. 36 * This is *not* particularly important for level triggered 37 * but in a edge trigger case, we might be setting rte 38 * when an active trigger is coming in. This could 39 * cause some ioapics to mal-function. 40 * Being paranoid i guess! 41 * 42 * For correct operation this depends on the caller 43 * masking the irqs. 44 */ 45 if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids) 46 irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false); 47 48 cpumask_clear(desc->pending_mask); 49 } 50 51 void irq_move_irq(struct irq_data *idata) 52 { 53 bool masked; 54 55 if (likely(!irqd_is_setaffinity_pending(idata))) 56 return; 57 58 if (unlikely(irqd_irq_disabled(idata))) 59 return; 60 61 /* 62 * Be careful vs. already masked interrupts. If this is a 63 * threaded interrupt with ONESHOT set, we can end up with an 64 * interrupt storm. 65 */ 66 masked = irqd_irq_masked(idata); 67 if (!masked) 68 idata->chip->irq_mask(idata); 69 irq_move_masked_irq(idata); 70 if (!masked) 71 idata->chip->irq_unmask(idata); 72 } 73