1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/irq.h> 4 #include <linux/interrupt.h> 5 6 #include "internals.h" 7 8 /** 9 * irq_fixup_move_pending - Cleanup irq move pending from a dying CPU 10 * @desc: Interrupt descpriptor to clean up 11 * @force_clear: If set clear the move pending bit unconditionally. 12 * If not set, clear it only when the dying CPU is the 13 * last one in the pending mask. 14 * 15 * Returns true if the pending bit was set and the pending mask contains an 16 * online CPU other than the dying CPU. 17 */ 18 bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear) 19 { 20 struct irq_data *data = irq_desc_get_irq_data(desc); 21 22 if (!irqd_is_setaffinity_pending(data)) 23 return false; 24 25 /* 26 * The outgoing CPU might be the last online target in a pending 27 * interrupt move. If that's the case clear the pending move bit. 28 */ 29 if (cpumask_any_and(desc->pending_mask, cpu_online_mask) >= nr_cpu_ids) { 30 irqd_clr_move_pending(data); 31 return false; 32 } 33 if (force_clear) 34 irqd_clr_move_pending(data); 35 return true; 36 } 37 38 void irq_move_masked_irq(struct irq_data *idata) 39 { 40 struct irq_desc *desc = irq_data_to_desc(idata); 41 struct irq_chip *chip = desc->irq_data.chip; 42 43 if (likely(!irqd_is_setaffinity_pending(&desc->irq_data))) 44 return; 45 46 irqd_clr_move_pending(&desc->irq_data); 47 48 /* 49 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. 50 */ 51 if (irqd_is_per_cpu(&desc->irq_data)) { 52 WARN_ON(1); 53 return; 54 } 55 56 if (unlikely(cpumask_empty(desc->pending_mask))) 57 return; 58 59 if (!chip->irq_set_affinity) 60 return; 61 62 assert_raw_spin_locked(&desc->lock); 63 64 /* 65 * If there was a valid mask to work with, please 66 * do the disable, re-program, enable sequence. 67 * This is *not* particularly important for level triggered 68 * but in a edge trigger case, we might be setting rte 69 * when an active trigger is coming in. This could 70 * cause some ioapics to mal-function. 71 * Being paranoid i guess! 72 * 73 * For correct operation this depends on the caller 74 * masking the irqs. 75 */ 76 if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids) 77 irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false); 78 79 cpumask_clear(desc->pending_mask); 80 } 81 82 void irq_move_irq(struct irq_data *idata) 83 { 84 bool masked; 85 86 /* 87 * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled, 88 * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is 89 * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here. 90 */ 91 idata = irq_desc_get_irq_data(irq_data_to_desc(idata)); 92 93 if (likely(!irqd_is_setaffinity_pending(idata))) 94 return; 95 96 if (unlikely(irqd_irq_disabled(idata))) 97 return; 98 99 /* 100 * Be careful vs. already masked interrupts. If this is a 101 * threaded interrupt with ONESHOT set, we can end up with an 102 * interrupt storm. 103 */ 104 masked = irqd_irq_masked(idata); 105 if (!masked) 106 idata->chip->irq_mask(idata); 107 irq_move_masked_irq(idata); 108 if (!masked) 109 idata->chip->irq_unmask(idata); 110 } 111