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 descriptor 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_intersects(desc->pending_mask, cpu_online_mask)) { 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_data *data = &desc->irq_data; 42 struct irq_chip *chip = data->chip; 43 44 if (likely(!irqd_is_setaffinity_pending(data))) 45 return; 46 47 irqd_clr_move_pending(data); 48 49 /* 50 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. 51 */ 52 if (irqd_is_per_cpu(data)) { 53 WARN_ON(1); 54 return; 55 } 56 57 if (unlikely(cpumask_empty(desc->pending_mask))) 58 return; 59 60 if (!chip->irq_set_affinity) 61 return; 62 63 assert_raw_spin_locked(&desc->lock); 64 65 /* 66 * If there was a valid mask to work with, please 67 * do the disable, re-program, enable sequence. 68 * This is *not* particularly important for level triggered 69 * but in a edge trigger case, we might be setting rte 70 * when an active trigger is coming in. This could 71 * cause some ioapics to mal-function. 72 * Being paranoid i guess! 73 * 74 * For correct operation this depends on the caller 75 * masking the irqs. 76 */ 77 if (cpumask_intersects(desc->pending_mask, cpu_online_mask)) { 78 int ret; 79 80 ret = irq_do_set_affinity(data, desc->pending_mask, false); 81 /* 82 * If the there is a cleanup pending in the underlying 83 * vector management, reschedule the move for the next 84 * interrupt. Leave desc->pending_mask intact. 85 */ 86 if (ret == -EBUSY) { 87 irqd_set_move_pending(data); 88 return; 89 } 90 } 91 cpumask_clear(desc->pending_mask); 92 } 93 94 void __irq_move_irq(struct irq_data *idata) 95 { 96 bool masked; 97 98 /* 99 * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled, 100 * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is 101 * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here. 102 */ 103 idata = irq_desc_get_irq_data(irq_data_to_desc(idata)); 104 105 if (unlikely(irqd_irq_disabled(idata))) 106 return; 107 108 /* 109 * Be careful vs. already masked interrupts. If this is a 110 * threaded interrupt with ONESHOT set, we can end up with an 111 * interrupt storm. 112 */ 113 masked = irqd_irq_masked(idata); 114 if (!masked) 115 idata->chip->irq_mask(idata); 116 irq_move_masked_irq(idata); 117 if (!masked) 118 idata->chip->irq_unmask(idata); 119 } 120