Merge tag 'remoteproc-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/ohad...
[firefly-linux-kernel-4.4.55.git] / kernel / irq / migration.c
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 = desc->irq_data.chip;
11
12         if (likely(!irqd_is_setaffinity_pending(&desc->irq_data)))
13                 return;
14
15         irqd_clr_move_pending(&desc->irq_data);
16
17         /*
18          * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
19          */
20         if (irqd_is_per_cpu(&desc->irq_data)) {
21                 WARN_ON(1);
22                 return;
23         }
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 (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids)
46                 irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
47
48         cpumask_clear(desc->pending_mask);
49 }
50
51 void irq_move_irq(struct irq_data *idata)
52 {
53         bool masked;
54
55         /*
56          * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled,
57          * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is
58          * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here.
59          */
60         idata = irq_desc_get_irq_data(irq_data_to_desc(idata));
61
62         if (likely(!irqd_is_setaffinity_pending(idata)))
63                 return;
64
65         if (unlikely(irqd_irq_disabled(idata)))
66                 return;
67
68         /*
69          * Be careful vs. already masked interrupts. If this is a
70          * threaded interrupt with ONESHOT set, we can end up with an
71          * interrupt storm.
72          */
73         masked = irqd_irq_masked(idata);
74         if (!masked)
75                 idata->chip->irq_mask(idata);
76         irq_move_masked_irq(idata);
77         if (!masked)
78                 idata->chip->irq_unmask(idata);
79 }