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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 : 0 : bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear) 19 : : { 20 [ # # ]: 0 : struct irq_data *data = irq_desc_get_irq_data(desc); 21 : : 22 [ # # ]: 0 : 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 [ # # ]: 0 : if (cpumask_any_and(desc->pending_mask, cpu_online_mask) >= nr_cpu_ids) { 30 : 0 : irqd_clr_move_pending(data); 31 : 0 : return false; 32 : : } 33 [ # # ]: 0 : if (force_clear) 34 : 0 : irqd_clr_move_pending(data); 35 : : return true; 36 : : } 37 : : 38 : 0 : void irq_move_masked_irq(struct irq_data *idata) 39 : : { 40 [ # # ]: 0 : struct irq_desc *desc = irq_data_to_desc(idata); 41 : 0 : struct irq_data *data = &desc->irq_data; 42 : 0 : struct irq_chip *chip = data->chip; 43 : : 44 [ # # ]: 0 : if (likely(!irqd_is_setaffinity_pending(data))) 45 : : return; 46 : : 47 [ # # ]: 0 : irqd_clr_move_pending(data); 48 : : 49 : : /* 50 : : * Paranoia: cpu-local interrupts shouldn't be calling in here anyway. 51 : : */ 52 [ # # ]: 0 : if (irqd_is_per_cpu(data)) { 53 : 0 : WARN_ON(1); 54 : 0 : return; 55 : : } 56 : : 57 [ # # ]: 0 : if (unlikely(cpumask_empty(desc->pending_mask))) 58 : : return; 59 : : 60 [ # # ]: 0 : if (!chip->irq_set_affinity) 61 : : return; 62 : : 63 [ # # ]: 0 : 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 [ # # ]: 0 : if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids) { 78 : 0 : int ret; 79 : : 80 : 0 : 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 [ # # ]: 0 : if (ret == -EBUSY) { 87 : 0 : irqd_set_move_pending(data); 88 : 0 : return; 89 : : } 90 : : } 91 : 0 : cpumask_clear(desc->pending_mask); 92 : : } 93 : : 94 : 0 : void __irq_move_irq(struct irq_data *idata) 95 : : { 96 : 0 : 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 [ # # ]: 0 : idata = irq_desc_get_irq_data(irq_data_to_desc(idata)); 104 : : 105 [ # # ]: 0 : 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 [ # # ]: 0 : masked = irqd_irq_masked(idata); 114 [ # # ]: 0 : if (!masked) 115 : 0 : idata->chip->irq_mask(idata); 116 : 0 : irq_move_masked_irq(idata); 117 [ # # ]: 0 : if (!masked) 118 : 0 : idata->chip->irq_unmask(idata); 119 : : }