![Rusty Russell](/assets/img/avatar_default.png)
Impact: change existing irq_chip API Not much point with gentle transition here: the struct irq_chip's setaffinity method signature needs to change. Fortunately, not widely used code, but hits a few architectures. Note: In irq_select_affinity() I save a temporary in by mangling irq_desc[irq].affinity directly. Ingo, does this break anything? (Folded in fix from KOSAKI Motohiro) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Grant Grundler <grundler@parisc-linux.org> Acked-by: Ingo Molnar <mingo@redhat.com> Cc: ralf@linux-mips.org Cc: grundler@parisc-linux.org Cc: jeremy@xensource.com Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
210 lines
5.2 KiB
C
210 lines
5.2 KiB
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/module.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/init.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/list.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/mach/irq.h>
|
|
#include <asm/mach/time.h>
|
|
|
|
/*
|
|
* No architecture-specific irq_finish function defined in arm/arch/irqs.h.
|
|
*/
|
|
#ifndef irq_finish
|
|
#define irq_finish(irq) do { } while (0)
|
|
#endif
|
|
|
|
void (*init_arch_irq)(void) __initdata = NULL;
|
|
unsigned long irq_err_count;
|
|
|
|
int show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
int i = *(loff_t *) v, cpu;
|
|
struct irqaction * action;
|
|
unsigned long flags;
|
|
|
|
if (i == 0) {
|
|
char cpuname[12];
|
|
|
|
seq_printf(p, " ");
|
|
for_each_present_cpu(cpu) {
|
|
sprintf(cpuname, "CPU%d", cpu);
|
|
seq_printf(p, " %10s", cpuname);
|
|
}
|
|
seq_putc(p, '\n');
|
|
}
|
|
|
|
if (i < NR_IRQS) {
|
|
spin_lock_irqsave(&irq_desc[i].lock, flags);
|
|
action = irq_desc[i].action;
|
|
if (!action)
|
|
goto unlock;
|
|
|
|
seq_printf(p, "%3d: ", i);
|
|
for_each_present_cpu(cpu)
|
|
seq_printf(p, "%10u ", kstat_cpu(cpu).irqs[i]);
|
|
seq_printf(p, " %10s", irq_desc[i].chip->name ? : "-");
|
|
seq_printf(p, " %s", action->name);
|
|
for (action = action->next; action; action = action->next)
|
|
seq_printf(p, ", %s", action->name);
|
|
|
|
seq_putc(p, '\n');
|
|
unlock:
|
|
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
|
|
} else if (i == NR_IRQS) {
|
|
#ifdef CONFIG_ARCH_ACORN
|
|
show_fiq_list(p, v);
|
|
#endif
|
|
#ifdef CONFIG_SMP
|
|
show_ipi_list(p);
|
|
show_local_irqs(p);
|
|
#endif
|
|
seq_printf(p, "Err: %10lu\n", irq_err_count);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Handle bad interrupts */
|
|
static struct irq_desc bad_irq_desc = {
|
|
.handle_irq = handle_bad_irq,
|
|
.lock = SPIN_LOCK_UNLOCKED
|
|
};
|
|
|
|
/*
|
|
* do_IRQ handles all hardware IRQ's. Decoded IRQs should not
|
|
* come via this function. Instead, they should provide their
|
|
* own 'handler'
|
|
*/
|
|
asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
|
|
{
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
|
|
|
irq_enter();
|
|
|
|
/*
|
|
* Some hardware gives randomly wrong interrupts. Rather
|
|
* than crashing, do something sensible.
|
|
*/
|
|
if (irq >= NR_IRQS)
|
|
handle_bad_irq(irq, &bad_irq_desc);
|
|
else
|
|
generic_handle_irq(irq);
|
|
|
|
/* AT91 specific workaround */
|
|
irq_finish(irq);
|
|
|
|
irq_exit();
|
|
set_irq_regs(old_regs);
|
|
}
|
|
|
|
void set_irq_flags(unsigned int irq, unsigned int iflags)
|
|
{
|
|
struct irq_desc *desc;
|
|
unsigned long flags;
|
|
|
|
if (irq >= NR_IRQS) {
|
|
printk(KERN_ERR "Trying to set irq flags for IRQ%d\n", irq);
|
|
return;
|
|
}
|
|
|
|
desc = irq_desc + irq;
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
|
|
if (iflags & IRQF_VALID)
|
|
desc->status &= ~IRQ_NOREQUEST;
|
|
if (iflags & IRQF_PROBE)
|
|
desc->status &= ~IRQ_NOPROBE;
|
|
if (!(iflags & IRQF_NOAUTOEN))
|
|
desc->status &= ~IRQ_NOAUTOEN;
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
int irq;
|
|
|
|
for (irq = 0; irq < NR_IRQS; irq++)
|
|
irq_desc[irq].status |= IRQ_NOREQUEST | IRQ_NOPROBE;
|
|
|
|
#ifdef CONFIG_SMP
|
|
bad_irq_desc.affinity = CPU_MASK_ALL;
|
|
bad_irq_desc.cpu = smp_processor_id();
|
|
#endif
|
|
init_arch_irq();
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
static void route_irq(struct irq_desc *desc, unsigned int irq, unsigned int cpu)
|
|
{
|
|
pr_debug("IRQ%u: moving from cpu%u to cpu%u\n", irq, desc->cpu, cpu);
|
|
|
|
spin_lock_irq(&desc->lock);
|
|
desc->chip->set_affinity(irq, cpumask_of(cpu));
|
|
spin_unlock_irq(&desc->lock);
|
|
}
|
|
|
|
/*
|
|
* The 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.
|
|
*/
|
|
void migrate_irqs(void)
|
|
{
|
|
unsigned int i, cpu = smp_processor_id();
|
|
|
|
for (i = 0; i < NR_IRQS; i++) {
|
|
struct irq_desc *desc = irq_desc + i;
|
|
|
|
if (desc->cpu == cpu) {
|
|
unsigned int newcpu = any_online_cpu(desc->affinity);
|
|
|
|
if (newcpu == NR_CPUS) {
|
|
if (printk_ratelimit())
|
|
printk(KERN_INFO "IRQ%u no longer affine to CPU%u\n",
|
|
i, cpu);
|
|
|
|
cpus_setall(desc->affinity);
|
|
newcpu = any_online_cpu(desc->affinity);
|
|
}
|
|
|
|
route_irq(desc, i, newcpu);
|
|
}
|
|
}
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|