2 * Based on arch/arm/kernel/irq.c
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.
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.
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.
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/>.
24 #include <linux/kernel_stat.h>
25 #include <linux/irq.h>
26 #include <linux/smp.h>
27 #include <linux/init.h>
28 #include <linux/irqchip.h>
29 #include <linux/seq_file.h>
30 #include <linux/ratelimit.h>
32 #include <linux/mt_sched_mon.h>
33 unsigned long irq_err_count
;
35 int arch_show_interrupts(struct seq_file
*p
, int prec
)
38 show_ipi_list(p
, prec
);
40 seq_printf(p
, "%*s: %10lu\n", prec
, "Err", irq_err_count
);
44 #ifdef CONFIG_MTK_SCHED_TRACERS
45 #include <trace/events/mtk_events.h>
49 * handle_IRQ handles all hardware IRQ's. Decoded IRQs should
50 * not come via this function. Instead, they should provide their
51 * own 'handler'. Used by platform code implementing C-based 1st
54 void handle_IRQ(unsigned int irq
, struct pt_regs
*regs
)
56 struct pt_regs
*old_regs
= set_irq_regs(regs
);
57 #ifdef CONFIG_MTK_SCHED_TRACERS
58 struct irq_desc
*desc
;
62 mt_trace_ISR_start(irq
);
63 #ifdef CONFIG_MTK_SCHED_TRACERS
64 desc
= irq_to_desc(irq
);
66 (desc
&& desc
->action
&& desc
->action
->name
) ? desc
->action
->name
: "-");
70 * Some hardware gives randomly wrong interrupts. Rather
71 * than crashing, do something sensible.
73 if (unlikely(irq
>= nr_irqs
)) {
74 pr_warn_ratelimited("Bad IRQ%u\n", irq
);
77 generic_handle_irq(irq
);
79 #ifdef CONFIG_MTK_SCHED_TRACERS
82 mt_trace_ISR_end(irq
);
84 set_irq_regs(old_regs
);
87 void __init
set_handle_irq(void (*handle_irq
)(struct pt_regs
*))
92 handle_arch_irq
= handle_irq
;
95 void __init
init_IRQ(void)
99 panic("No interrupt controller found.");
102 #ifdef CONFIG_HOTPLUG_CPU
103 static bool migrate_one_irq(struct irq_desc
*desc
)
105 struct irq_data
*d
= irq_desc_get_irq_data(desc
);
106 const struct cpumask
*affinity
= d
->affinity
;
111 * If this is a per-CPU interrupt, or the affinity does not
112 * include this CPU, then we have nothing to do.
114 if (irqd_is_per_cpu(d
) || !cpumask_test_cpu(smp_processor_id(), affinity
))
117 if (cpumask_any_and(affinity
, cpu_online_mask
) >= nr_cpu_ids
) {
118 affinity
= cpu_online_mask
;
122 c
= irq_data_get_irq_chip(d
);
123 if (!c
->irq_set_affinity
)
124 pr_debug("IRQ%u: unable to set affinity\n", d
->irq
);
125 else if (c
->irq_set_affinity(d
, affinity
, true) == IRQ_SET_MASK_OK
&& ret
)
126 cpumask_copy(d
->affinity
, affinity
);
132 * The current CPU has been marked offline. Migrate IRQs off this CPU.
133 * If the affinity settings do not allow other CPUs, force them onto any
136 * Note: we must iterate over all IRQs, whether they have an attached
137 * action structure or not, as we need to get chained interrupts too.
139 void migrate_irqs(void)
142 struct irq_desc
*desc
;
145 local_irq_save(flags
);
147 for_each_irq_desc(i
, desc
) {
148 bool affinity_broken
;
150 raw_spin_lock(&desc
->lock
);
151 affinity_broken
= migrate_one_irq(desc
);
152 raw_spin_unlock(&desc
->lock
);
155 pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n",
156 i
, smp_processor_id());
159 local_irq_restore(flags
);
161 #endif /* CONFIG_HOTPLUG_CPU */