lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask) |
| 46 | < nr_cpu_ids)) { |
| 47 | int ret = chip->irq_set_affinity(&desc->irq_data, |
| 48 | desc->pending_mask, false); |
| 49 | switch (ret) { |
| 50 | case IRQ_SET_MASK_OK: |
| 51 | cpumask_copy(desc->irq_data.affinity, desc->pending_mask); |
| 52 | case IRQ_SET_MASK_OK_NOCOPY: |
| 53 | irq_set_thread_affinity(desc); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | cpumask_clear(desc->pending_mask); |
| 58 | } |
| 59 | |
| 60 | void irq_move_irq(struct irq_data *idata) |
| 61 | { |
| 62 | bool masked; |
| 63 | |
| 64 | if (likely(!irqd_is_setaffinity_pending(idata))) |
| 65 | return; |
| 66 | |
| 67 | if (unlikely(irqd_irq_disabled(idata))) |
| 68 | return; |
| 69 | |
| 70 | /* |
| 71 | * Be careful vs. already masked interrupts. If this is a |
| 72 | * threaded interrupt with ONESHOT set, we can end up with an |
| 73 | * interrupt storm. |
| 74 | */ |
| 75 | masked = irqd_irq_masked(idata); |
| 76 | if (!masked) |
| 77 | idata->chip->irq_mask(idata); |
| 78 | irq_move_masked_irq(idata); |
| 79 | if (!masked) |
| 80 | idata->chip->irq_unmask(idata); |
| 81 | } |