1
2#include <linux/irq.h>
3
4void set_pending_irq(unsigned int irq, cpumask_t mask)
5{
6	struct irq_desc *desc = irq_desc + irq;
7	unsigned long flags;
8
9	spin_lock_irqsave(&desc->lock, flags);
10	desc->status |= IRQ_MOVE_PENDING;
11	irq_desc[irq].pending_mask = mask;
12	spin_unlock_irqrestore(&desc->lock, flags);
13}
14
15void move_masked_irq(int irq)
16{
17	struct irq_desc *desc = irq_desc + irq;
18	cpumask_t tmp;
19
20	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
21		return;
22
23	/*
24	 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
25	 */
26	if (CHECK_IRQ_PER_CPU(desc->status)) {
27		WARN_ON(1);
28		return;
29	}
30
31	desc->status &= ~IRQ_MOVE_PENDING;
32
33	if (unlikely(cpus_empty(irq_desc[irq].pending_mask)))
34		return;
35
36	if (!desc->chip->set_affinity)
37		return;
38
39	assert_spin_locked(&desc->lock);
40
41	cpus_and(tmp, irq_desc[irq].pending_mask, cpu_online_map);
42
43	/*
44	 * If there was a valid mask to work with, please
45	 * do the disable, re-program, enable sequence.
46	 * This is *not* particularly important for level triggered
47	 * but in a edge trigger case, we might be setting rte
48	 * when an active trigger is comming in. This could
49	 * cause some ioapics to mal-function.
50	 * Being paranoid i guess!
51	 *
52	 * For correct operation this depends on the caller
53	 * masking the irqs.
54	 */
55	if (likely(!cpus_empty(tmp))) {
56		desc->chip->set_affinity(irq,tmp);
57	}
58	cpus_clear(irq_desc[irq].pending_mask);
59}
60
61void move_native_irq(int irq)
62{
63	struct irq_desc *desc = irq_desc + irq;
64
65	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
66		return;
67
68	if (unlikely(desc->status & IRQ_DISABLED))
69		return;
70
71	desc->chip->mask(irq);
72	move_masked_irq(irq);
73	desc->chip->unmask(irq);
74}
75