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linux
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irq.c
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linux
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irq.c
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/* * 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(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 */
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