Release 4.11 arch/arm/kernel/irq.c
/*
* linux/arch/arm/kernel/irq.c
*
* Copyright (C) 1992 Linus Torvalds
* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
*
* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
* Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This file contains the code used by various IRQ handling routines:
* asking for different IRQ's should be done through these routines
* instead of just grabbing them. Thus setups with different IRQ numbers
* shouldn't result in any weird surprises, and installing new handlers
* should be easier.
*
* IRQ's are in fact implemented a bit like signal handlers for the kernel.
* Naturally it's not a 1:1 relation, but there are similarities.
*/
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/ratelimit.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/kallsyms.h>
#include <linux/proc_fs.h>
#include <linux/export.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/hardware/cache-uniphier.h>
#include <asm/outercache.h>
#include <asm/exception.h>
#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
unsigned long irq_err_count;
int arch_show_interrupts(struct seq_file *p, int prec)
{
#ifdef CONFIG_FIQ
show_fiq_list(p, prec);
#endif
#ifdef CONFIG_SMP
show_ipi_list(p, prec);
#endif
seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 26 | 49.06% | 4 | 50.00% |
| Thomas Gleixner | 23 | 43.40% | 2 | 25.00% |
| Arnaldo Carvalho de Melo | 3 | 5.66% | 1 | 12.50% |
| Ben Dooks | 1 | 1.89% | 1 | 12.50% |
| Total | 53 | 100.00% | 8 | 100.00% |
/*
* handle_IRQ handles all hardware IRQ's. Decoded IRQs should
* not come via this function. Instead, they should provide their
* own 'handler'. Used by platform code implementing C-based 1st
* level decoding.
*/
void handle_IRQ(unsigned int irq, struct pt_regs *regs)
{
__handle_domain_irq(NULL, irq, false, regs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 8 | 32.00% | 2 | 28.57% |
| Marc Zyngier | 6 | 24.00% | 1 | 14.29% |
| Thomas Gleixner | 6 | 24.00% | 1 | 14.29% |
| Aaro Koskinen | 2 | 8.00% | 1 | 14.29% |
| Linus Torvalds | 2 | 8.00% | 1 | 14.29% |
| Dmitry Baryshkov | 1 | 4.00% | 1 | 14.29% |
| Total | 25 | 100.00% | 7 | 100.00% |
/*
* asm_do_IRQ is the interface to be used from assembly code.
*/
asmlinkage void __exception_irq_entry
asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
handle_IRQ(irq, regs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 23 | 100.00% | 1 | 100.00% |
| Total | 23 | 100.00% | 1 | 100.00% |
void __init init_IRQ(void)
{
int ret;
if (IS_ENABLED(CONFIG_OF) && !machine_desc->init_irq)
irqchip_init();
else
machine_desc->init_irq();
if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
(machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
if (!outer_cache.write_sec)
outer_cache.write_sec = machine_desc->l2c_write_sec;
ret = l2x0_of_init(machine_desc->l2c_aux_val,
machine_desc->l2c_aux_mask);
if (ret && ret != -ENODEV)
pr_err("L2C: failed to init: %d\n", ret);
}
uniphier_cache_init();
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 62 | 60.19% | 2 | 22.22% |
| Maxime Ripard | 16 | 15.53% | 1 | 11.11% |
| Linus Torvalds (pre-git) | 10 | 9.71% | 3 | 33.33% |
| Tomasz Figa | 7 | 6.80% | 1 | 11.11% |
| Andi Shyti | 5 | 4.85% | 1 | 11.11% |
| Masahiro Yamada | 3 | 2.91% | 1 | 11.11% |
| Total | 103 | 100.00% | 9 | 100.00% |
#ifdef CONFIG_MULTI_IRQ_HANDLER
void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
{
if (handle_arch_irq)
return;
handle_arch_irq = handle_irq;
}
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| Thomas Petazzoni | 26 | 100.00% | 1 | 100.00% |
| Total | 26 | 100.00% | 1 | 100.00% |
#endif
#ifdef CONFIG_SPARSE_IRQ
int __init arch_probe_nr_irqs(void)
{
nr_irqs = machine_desc->nr_irqs ? machine_desc->nr_irqs : NR_IRQS;
return nr_irqs;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Eric Miao | 16 | 69.57% | 1 | 33.33% |
| Russell King | 6 | 26.09% | 1 | 33.33% |
| Thomas Gleixner | 1 | 4.35% | 1 | 33.33% |
| Total | 23 | 100.00% | 3 | 100.00% |
#endif
#ifdef CONFIG_HOTPLUG_CPU
static bool migrate_one_irq(struct irq_desc *desc)
{
struct irq_data *d = irq_desc_get_irq_data(desc);
const struct cpumask *affinity = irq_data_get_affinity_mask(d);
struct irq_chip *c;
bool ret = false;
/*
* If this is a per-CPU interrupt, or the affinity does not
* include this CPU, then we have nothing to do.
*/
if (irqd_is_per_cpu(d) || !cpumask_test_cpu(smp_processor_id(), affinity))
return false;
if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) {
affinity = cpu_online_mask;
ret = true;
}
c = irq_data_get_irq_chip(d);
if (!c->irq_set_affinity)
pr_debug("IRQ%u: unable to set affinity\n", d->irq);
else if (c->irq_set_affinity(d, affinity, false) == IRQ_SET_MASK_OK && ret)
cpumask_copy(irq_data_get_affinity_mask(d), affinity);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 96 | 70.07% | 3 | 37.50% |
| Will Deacon | 21 | 15.33% | 1 | 12.50% |
| Thomas Gleixner | 11 | 8.03% | 1 | 12.50% |
| Jiang Liu | 6 | 4.38% | 1 | 12.50% |
| Lennert Buytenhek | 2 | 1.46% | 1 | 12.50% |
| Sudeep Holla | 1 | 0.73% | 1 | 12.50% |
| Total | 137 | 100.00% | 8 | 100.00% |
/*
* The current CPU has been marked offline. Migrate IRQs off this CPU.
* If the affinity settings do not allow other CPUs, force them onto any
* available CPU.
*
* Note: we must iterate over all IRQs, whether they have an attached
* action structure or not, as we need to get chained interrupts too.
*/
void migrate_irqs(void)
{
unsigned int i;
struct irq_desc *desc;
unsigned long flags;
local_irq_save(flags);
for_each_irq_desc(i, desc) {
bool affinity_broken;
raw_spin_lock(&desc->lock);
affinity_broken = migrate_one_irq(desc);
raw_spin_unlock(&desc->lock);
if (affinity_broken)
pr_warn_ratelimited("IRQ%u no longer affine to CPU%u\n",
i, smp_processor_id());
}
local_irq_restore(flags);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 71 | 91.03% | 5 | 83.33% |
| Eric Miao | 7 | 8.97% | 1 | 16.67% |
| Total | 78 | 100.00% | 6 | 100.00% |
#endif /* CONFIG_HOTPLUG_CPU */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 330 | 58.82% | 19 | 41.30% |
| Thomas Gleixner | 47 | 8.38% | 4 | 8.70% |
| Linus Torvalds (pre-git) | 34 | 6.06% | 3 | 6.52% |
| Thomas Petazzoni | 31 | 5.53% | 1 | 2.17% |
| Eric Miao | 28 | 4.99% | 1 | 2.17% |
| Will Deacon | 21 | 3.74% | 1 | 2.17% |
| Maxime Ripard | 19 | 3.39% | 1 | 2.17% |
| Tomasz Figa | 7 | 1.25% | 1 | 2.17% |
| Masahiro Yamada | 6 | 1.07% | 1 | 2.17% |
| Jiang Liu | 6 | 1.07% | 1 | 2.17% |
| Marc Zyngier | 6 | 1.07% | 1 | 2.17% |
| Andi Shyti | 5 | 0.89% | 1 | 2.17% |
| Linus Torvalds | 5 | 0.89% | 2 | 4.35% |
| Arnd Bergmann | 3 | 0.53% | 1 | 2.17% |
| Arnaldo Carvalho de Melo | 3 | 0.53% | 1 | 2.17% |
| Rabin Vincent | 2 | 0.36% | 1 | 2.17% |
| Lennert Buytenhek | 2 | 0.36% | 1 | 2.17% |
| Aaro Koskinen | 2 | 0.36% | 1 | 2.17% |
| Jamie Iles | 1 | 0.18% | 1 | 2.17% |
| Dmitry Baryshkov | 1 | 0.18% | 1 | 2.17% |
| Ben Dooks | 1 | 0.18% | 1 | 2.17% |
| Sudeep Holla | 1 | 0.18% | 1 | 2.17% |
| Total | 561 | 100.00% | 46 | 100.00% |
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