163 lines
3.7 KiB
C
163 lines
3.7 KiB
C
/*
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* linux/arch/alpha/kernel/irq.c
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*
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* Copyright (C) 1995 Linus Torvalds
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*
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* This file contains the code used by various IRQ handling routines:
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* asking for different IRQ's should be done through these routines
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* instead of just grabbing them. Thus setups with different IRQ numbers
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* shouldn't result in any weird surprises, and installing new handlers
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* should be easier.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/profile.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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volatile unsigned long irq_err_count;
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void ack_bad_irq(unsigned int irq)
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{
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irq_err_count++;
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printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
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}
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#ifdef CONFIG_SMP
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static char irq_user_affinity[NR_IRQS];
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int
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select_smp_affinity(unsigned int irq)
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{
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static int last_cpu;
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int cpu = last_cpu + 1;
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if (!irq_desc[irq].handler->set_affinity || irq_user_affinity[irq])
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return 1;
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while (!cpu_possible(cpu))
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cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
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last_cpu = cpu;
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irq_affinity[irq] = cpumask_of_cpu(cpu);
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irq_desc[irq].handler->set_affinity(irq, cpumask_of_cpu(cpu));
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return 0;
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}
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#endif /* CONFIG_SMP */
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int
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show_interrupts(struct seq_file *p, void *v)
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{
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#ifdef CONFIG_SMP
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int j;
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#endif
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int i = *(loff_t *) v;
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struct irqaction * action;
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unsigned long flags;
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#ifdef CONFIG_SMP
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if (i == 0) {
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seq_puts(p, " ");
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for (i = 0; i < NR_CPUS; i++)
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if (cpu_online(i))
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seq_printf(p, "CPU%d ", i);
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seq_putc(p, '\n');
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}
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#endif
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if (i < ACTUAL_NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto unlock;
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seq_printf(p, "%3d: ",i);
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#ifndef CONFIG_SMP
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seq_printf(p, "%10u ", kstat_irqs(i));
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#else
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for (j = 0; j < NR_CPUS; j++)
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if (cpu_online(j))
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seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
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#endif
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seq_printf(p, " %14s", irq_desc[i].handler->typename);
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seq_printf(p, " %c%s",
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(action->flags & SA_INTERRUPT)?'+':' ',
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action->name);
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for (action=action->next; action; action = action->next) {
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seq_printf(p, ", %c%s",
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(action->flags & SA_INTERRUPT)?'+':' ',
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action->name);
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}
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seq_putc(p, '\n');
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unlock:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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} else if (i == ACTUAL_NR_IRQS) {
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#ifdef CONFIG_SMP
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seq_puts(p, "IPI: ");
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for (i = 0; i < NR_CPUS; i++)
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if (cpu_online(i))
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seq_printf(p, "%10lu ", cpu_data[i].ipi_count);
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seq_putc(p, '\n');
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#endif
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seq_printf(p, "ERR: %10lu\n", irq_err_count);
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}
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return 0;
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}
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/*
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* handle_irq handles all normal device IRQ's (the special
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* SMP cross-CPU interrupts have their own specific
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* handlers).
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*/
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#define MAX_ILLEGAL_IRQS 16
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void
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handle_irq(int irq, struct pt_regs * regs)
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{
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/*
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* We ack quickly, we don't want the irq controller
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* thinking we're snobs just because some other CPU has
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* disabled global interrupts (we have already done the
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* INT_ACK cycles, it's too late to try to pretend to the
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* controller that we aren't taking the interrupt).
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*
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* 0 return value means that this irq is already being
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* handled by some other CPU. (or is disabled)
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*/
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static unsigned int illegal_count=0;
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if ((unsigned) irq > ACTUAL_NR_IRQS && illegal_count < MAX_ILLEGAL_IRQS ) {
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irq_err_count++;
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illegal_count++;
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printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
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irq);
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return;
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}
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irq_enter();
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local_irq_disable();
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__do_IRQ(irq, regs);
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local_irq_enable();
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irq_exit();
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}
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