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git.proxmox.com Git - mirror_ubuntu-kernels.git/blob - kernel/irq/migration.c
3 #include <linux/interrupt.h>
8 * irq_fixup_move_pending - Cleanup irq move pending from a dying CPU
9 * @desc: Interrupt descpriptor to clean up
10 * @force_clear: If set clear the move pending bit unconditionally.
11 * If not set, clear it only when the dying CPU is the
12 * last one in the pending mask.
14 * Returns true if the pending bit was set and the pending mask contains an
15 * online CPU other than the dying CPU.
17 bool irq_fixup_move_pending(struct irq_desc
*desc
, bool force_clear
)
19 struct irq_data
*data
= irq_desc_get_irq_data(desc
);
21 if (!irqd_is_setaffinity_pending(data
))
25 * The outgoing CPU might be the last online target in a pending
26 * interrupt move. If that's the case clear the pending move bit.
28 if (cpumask_any_and(desc
->pending_mask
, cpu_online_mask
) >= nr_cpu_ids
) {
29 irqd_clr_move_pending(data
);
33 irqd_clr_move_pending(data
);
37 void irq_move_masked_irq(struct irq_data
*idata
)
39 struct irq_desc
*desc
= irq_data_to_desc(idata
);
40 struct irq_chip
*chip
= desc
->irq_data
.chip
;
42 if (likely(!irqd_is_setaffinity_pending(&desc
->irq_data
)))
45 irqd_clr_move_pending(&desc
->irq_data
);
48 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
50 if (irqd_is_per_cpu(&desc
->irq_data
)) {
55 if (unlikely(cpumask_empty(desc
->pending_mask
)))
58 if (!chip
->irq_set_affinity
)
61 assert_raw_spin_locked(&desc
->lock
);
64 * If there was a valid mask to work with, please
65 * do the disable, re-program, enable sequence.
66 * This is *not* particularly important for level triggered
67 * but in a edge trigger case, we might be setting rte
68 * when an active trigger is coming in. This could
69 * cause some ioapics to mal-function.
70 * Being paranoid i guess!
72 * For correct operation this depends on the caller
75 if (cpumask_any_and(desc
->pending_mask
, cpu_online_mask
) < nr_cpu_ids
)
76 irq_do_set_affinity(&desc
->irq_data
, desc
->pending_mask
, false);
78 cpumask_clear(desc
->pending_mask
);
81 void irq_move_irq(struct irq_data
*idata
)
86 * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled,
87 * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is
88 * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here.
90 idata
= irq_desc_get_irq_data(irq_data_to_desc(idata
));
92 if (likely(!irqd_is_setaffinity_pending(idata
)))
95 if (unlikely(irqd_irq_disabled(idata
)))
99 * Be careful vs. already masked interrupts. If this is a
100 * threaded interrupt with ONESHOT set, we can end up with an
103 masked
= irqd_irq_masked(idata
);
105 idata
->chip
->irq_mask(idata
);
106 irq_move_masked_irq(idata
);
108 idata
->chip
->irq_unmask(idata
);