Commit | Line | Data |
---|---|---|
fb9bd7d6 MZ |
1 | /* |
2 | * Based on arch/arm/kernel/irq.c | |
3 | * | |
4 | * Copyright (C) 1992 Linus Torvalds | |
5 | * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. | |
6 | * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. | |
7 | * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and | |
8 | * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. | |
9 | * Copyright (C) 2012 ARM Ltd. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
22 | */ | |
23 | ||
24 | #include <linux/kernel_stat.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/smp.h> | |
27 | #include <linux/init.h> | |
e851b58c | 28 | #include <linux/irqchip.h> |
fb9bd7d6 MZ |
29 | #include <linux/seq_file.h> |
30 | #include <linux/ratelimit.h> | |
31 | ||
32 | unsigned long irq_err_count; | |
33 | ||
34 | int arch_show_interrupts(struct seq_file *p, int prec) | |
35 | { | |
fb9bd7d6 | 36 | show_ipi_list(p, prec); |
fb9bd7d6 MZ |
37 | seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); |
38 | return 0; | |
39 | } | |
40 | ||
fcff5886 LA |
41 | void (*handle_arch_irq)(struct pt_regs *) = NULL; |
42 | ||
e851b58c CM |
43 | void __init set_handle_irq(void (*handle_irq)(struct pt_regs *)) |
44 | { | |
45 | if (handle_arch_irq) | |
46 | return; | |
47 | ||
48 | handle_arch_irq = handle_irq; | |
49 | } | |
fb9bd7d6 MZ |
50 | |
51 | void __init init_IRQ(void) | |
52 | { | |
e851b58c | 53 | irqchip_init(); |
fb9bd7d6 MZ |
54 | if (!handle_arch_irq) |
55 | panic("No interrupt controller found."); | |
56 | } | |
9327e2c6 MR |
57 | |
58 | #ifdef CONFIG_HOTPLUG_CPU | |
59 | static bool migrate_one_irq(struct irq_desc *desc) | |
60 | { | |
61 | struct irq_data *d = irq_desc_get_irq_data(desc); | |
3bc38fc1 | 62 | const struct cpumask *affinity = irq_data_get_affinity_mask(d); |
9327e2c6 MR |
63 | struct irq_chip *c; |
64 | bool ret = false; | |
65 | ||
66 | /* | |
67 | * If this is a per-CPU interrupt, or the affinity does not | |
68 | * include this CPU, then we have nothing to do. | |
69 | */ | |
70 | if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity)) | |
71 | return false; | |
72 | ||
3d8afe30 SH |
73 | if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { |
74 | affinity = cpu_online_mask; | |
9327e2c6 | 75 | ret = true; |
3d8afe30 | 76 | } |
9327e2c6 MR |
77 | |
78 | c = irq_data_get_irq_chip(d); | |
79 | if (!c->irq_set_affinity) | |
80 | pr_debug("IRQ%u: unable to set affinity\n", d->irq); | |
3d8afe30 | 81 | else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret) |
3bc38fc1 | 82 | cpumask_copy(irq_data_get_affinity_mask(d), affinity); |
9327e2c6 MR |
83 | |
84 | return ret; | |
85 | } | |
86 | ||
87 | /* | |
88 | * The current CPU has been marked offline. Migrate IRQs off this CPU. | |
89 | * If the affinity settings do not allow other CPUs, force them onto any | |
90 | * available CPU. | |
91 | * | |
92 | * Note: we must iterate over all IRQs, whether they have an attached | |
93 | * action structure or not, as we need to get chained interrupts too. | |
94 | */ | |
95 | void migrate_irqs(void) | |
96 | { | |
97 | unsigned int i; | |
98 | struct irq_desc *desc; | |
99 | unsigned long flags; | |
100 | ||
101 | local_irq_save(flags); | |
102 | ||
103 | for_each_irq_desc(i, desc) { | |
104 | bool affinity_broken; | |
105 | ||
106 | raw_spin_lock(&desc->lock); | |
107 | affinity_broken = migrate_one_irq(desc); | |
108 | raw_spin_unlock(&desc->lock); | |
109 | ||
110 | if (affinity_broken) | |
111 | pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n", | |
112 | i, smp_processor_id()); | |
113 | } | |
114 | ||
115 | local_irq_restore(flags); | |
116 | } | |
117 | #endif /* CONFIG_HOTPLUG_CPU */ |