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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 */
18bool irq_fixup_move_pending(struct irq_desc *desc, bool force_clear)
19{
20 struct irq_data *data = irq_desc_get_irq_data(desc);
21
22 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 if (cpumask_any_and(desc->pending_mask, cpu_online_mask) >= nr_cpu_ids) {
30 irqd_clr_move_pending(data);
31 return false;
32 }
33 if (force_clear)
34 irqd_clr_move_pending(data);
35 return true;
36}
37
38void irq_move_masked_irq(struct irq_data *idata)
39{
40 struct irq_desc *desc = irq_data_to_desc(idata);
41 struct irq_chip *chip = desc->irq_data.chip;
42
43 if (likely(!irqd_is_setaffinity_pending(&desc->irq_data)))
44 return;
45
46 irqd_clr_move_pending(&desc->irq_data);
47
48 /*
49 * Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
50 */
51 if (irqd_is_per_cpu(&desc->irq_data)) {
52 WARN_ON(1);
53 return;
54 }
55
56 if (unlikely(cpumask_empty(desc->pending_mask)))
57 return;
58
59 if (!chip->irq_set_affinity)
60 return;
61
62 assert_raw_spin_locked(&desc->lock);
63
64 /*
65 * If there was a valid mask to work with, please
66 * do the disable, re-program, enable sequence.
67 * This is *not* particularly important for level triggered
68 * but in a edge trigger case, we might be setting rte
69 * when an active trigger is coming in. This could
70 * cause some ioapics to mal-function.
71 * Being paranoid i guess!
72 *
73 * For correct operation this depends on the caller
74 * masking the irqs.
75 */
76 if (cpumask_any_and(desc->pending_mask, cpu_online_mask) < nr_cpu_ids)
77 irq_do_set_affinity(&desc->irq_data, desc->pending_mask, false);
78
79 cpumask_clear(desc->pending_mask);
80}
81
82void irq_move_irq(struct irq_data *idata)
83{
84 bool masked;
85
86 /*
87 * Get top level irq_data when CONFIG_IRQ_DOMAIN_HIERARCHY is enabled,
88 * and it should be optimized away when CONFIG_IRQ_DOMAIN_HIERARCHY is
89 * disabled. So we avoid an "#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY" here.
90 */
91 idata = irq_desc_get_irq_data(irq_data_to_desc(idata));
92
93 if (likely(!irqd_is_setaffinity_pending(idata)))
94 return;
95
96 if (unlikely(irqd_irq_disabled(idata)))
97 return;
98
99 /*
100 * Be careful vs. already masked interrupts. If this is a
101 * threaded interrupt with ONESHOT set, we can end up with an
102 * interrupt storm.
103 */
104 masked = irqd_irq_masked(idata);
105 if (!masked)
106 idata->chip->irq_mask(idata);
107 irq_move_masked_irq(idata);
108 if (!masked)
109 idata->chip->irq_unmask(idata);
110}
1
2#include <linux/irq.h>
3#include <linux/interrupt.h>
4
5#include "internals.h"
6
7void 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
51void 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}