163 lines
3.9 KiB
C
163 lines
3.9 KiB
C
/*
|
|
* linux/arch/alpha/kernel/irq.c
|
|
*
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/init.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/profile.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
volatile unsigned long irq_err_count;
|
|
|
|
void ack_bad_irq(unsigned int irq)
|
|
{
|
|
irq_err_count++;
|
|
printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static char irq_user_affinity[NR_IRQS];
|
|
|
|
int irq_select_affinity(unsigned int irq)
|
|
{
|
|
static int last_cpu;
|
|
int cpu = last_cpu + 1;
|
|
|
|
if (!irq_desc[irq].chip->set_affinity || irq_user_affinity[irq])
|
|
return 1;
|
|
|
|
while (!cpu_possible(cpu) ||
|
|
!cpumask_test_cpu(cpu, irq_default_affinity))
|
|
cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
|
|
last_cpu = cpu;
|
|
|
|
cpumask_copy(irq_desc[irq].affinity, cpumask_of(cpu));
|
|
irq_desc[irq].chip->set_affinity(irq, cpumask_of(cpu));
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
|
|
int
|
|
show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
int j;
|
|
#endif
|
|
int irq = *(loff_t *) v;
|
|
struct irqaction * action;
|
|
unsigned long flags;
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (irq == 0) {
|
|
seq_puts(p, " ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "CPU%d ", j);
|
|
seq_putc(p, '\n');
|
|
}
|
|
#endif
|
|
|
|
if (irq < ACTUAL_NR_IRQS) {
|
|
spin_lock_irqsave(&irq_desc[irq].lock, flags);
|
|
action = irq_desc[irq].action;
|
|
if (!action)
|
|
goto unlock;
|
|
seq_printf(p, "%3d: ", irq);
|
|
#ifndef CONFIG_SMP
|
|
seq_printf(p, "%10u ", kstat_irqs(irq));
|
|
#else
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", kstat_irqs_cpu(irq, j));
|
|
#endif
|
|
seq_printf(p, " %14s", irq_desc[irq].chip->name);
|
|
seq_printf(p, " %c%s",
|
|
(action->flags & IRQF_DISABLED)?'+':' ',
|
|
action->name);
|
|
|
|
for (action=action->next; action; action = action->next) {
|
|
seq_printf(p, ", %c%s",
|
|
(action->flags & IRQF_DISABLED)?'+':' ',
|
|
action->name);
|
|
}
|
|
|
|
seq_putc(p, '\n');
|
|
unlock:
|
|
spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
|
|
} else if (irq == ACTUAL_NR_IRQS) {
|
|
#ifdef CONFIG_SMP
|
|
seq_puts(p, "IPI: ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10lu ", cpu_data[j].ipi_count);
|
|
seq_putc(p, '\n');
|
|
#endif
|
|
seq_printf(p, "ERR: %10lu\n", irq_err_count);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* handle_irq handles all normal device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*/
|
|
|
|
#define MAX_ILLEGAL_IRQS 16
|
|
|
|
void
|
|
handle_irq(int irq)
|
|
{
|
|
/*
|
|
* We ack quickly, we don't want the irq controller
|
|
* thinking we're snobs just because some other CPU has
|
|
* disabled global interrupts (we have already done the
|
|
* INT_ACK cycles, it's too late to try to pretend to the
|
|
* controller that we aren't taking the interrupt).
|
|
*
|
|
* 0 return value means that this irq is already being
|
|
* handled by some other CPU. (or is disabled)
|
|
*/
|
|
static unsigned int illegal_count=0;
|
|
|
|
if ((unsigned) irq > ACTUAL_NR_IRQS && illegal_count < MAX_ILLEGAL_IRQS ) {
|
|
irq_err_count++;
|
|
illegal_count++;
|
|
printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
|
|
irq);
|
|
return;
|
|
}
|
|
|
|
irq_enter();
|
|
/*
|
|
* __do_IRQ() must be called with IPL_MAX. Note that we do not
|
|
* explicitly enable interrupts afterwards - some MILO PALcode
|
|
* (namely LX164 one) seems to have severe problems with RTI
|
|
* at IPL 0.
|
|
*/
|
|
local_irq_disable();
|
|
__do_IRQ(irq);
|
|
irq_exit();
|
|
}
|