![Andi Kleen](/assets/img/avatar_default.png)
Nobody has been setting the mismatch counter and the ifdef was never set so remove it. Signed-off-by: Andi Kleen <ak@suse.de>
175 lines
4 KiB
C
175 lines
4 KiB
C
/*
|
|
* linux/arch/x86_64/kernel/irq.c
|
|
*
|
|
* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
|
|
*
|
|
* This file contains the lowest level x86_64-specific interrupt
|
|
* entry and irq statistics code. All the remaining irq logic is
|
|
* done by the generic kernel/irq/ code and in the
|
|
* x86_64-specific irq controller code. (e.g. i8259.c and
|
|
* io_apic.c.)
|
|
*/
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/io_apic.h>
|
|
#include <asm/idle.h>
|
|
|
|
atomic_t irq_err_count;
|
|
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
/*
|
|
* Probabilistic stack overflow check:
|
|
*
|
|
* Only check the stack in process context, because everything else
|
|
* runs on the big interrupt stacks. Checking reliably is too expensive,
|
|
* so we just check from interrupts.
|
|
*/
|
|
static inline void stack_overflow_check(struct pt_regs *regs)
|
|
{
|
|
u64 curbase = (u64) current->thread_info;
|
|
static unsigned long warned = -60*HZ;
|
|
|
|
if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
|
|
regs->rsp < curbase + sizeof(struct thread_info) + 128 &&
|
|
time_after(jiffies, warned + 60*HZ)) {
|
|
printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
|
|
current->comm, curbase, regs->rsp);
|
|
show_stack(NULL,NULL);
|
|
warned = jiffies;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Generic, controller-independent functions:
|
|
*/
|
|
|
|
int show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
int i = *(loff_t *) v, j;
|
|
struct irqaction * action;
|
|
unsigned long flags;
|
|
|
|
if (i == 0) {
|
|
seq_printf(p, " ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "CPU%-8d",j);
|
|
seq_putc(p, '\n');
|
|
}
|
|
|
|
if (i < NR_IRQS) {
|
|
spin_lock_irqsave(&irq_desc[i].lock, flags);
|
|
action = irq_desc[i].action;
|
|
if (!action)
|
|
goto skip;
|
|
seq_printf(p, "%3d: ",i);
|
|
#ifndef CONFIG_SMP
|
|
seq_printf(p, "%10u ", kstat_irqs(i));
|
|
#else
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
|
|
#endif
|
|
seq_printf(p, " %14s", irq_desc[i].chip->typename);
|
|
|
|
seq_printf(p, " %s", action->name);
|
|
for (action=action->next; action; action = action->next)
|
|
seq_printf(p, ", %s", action->name);
|
|
seq_putc(p, '\n');
|
|
skip:
|
|
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
|
|
} else if (i == NR_IRQS) {
|
|
seq_printf(p, "NMI: ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
|
|
seq_putc(p, '\n');
|
|
seq_printf(p, "LOC: ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
|
|
seq_putc(p, '\n');
|
|
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* do_IRQ handles all normal device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*/
|
|
asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
|
|
{
|
|
/* high bit used in ret_from_ code */
|
|
unsigned irq = ~regs->orig_rax;
|
|
|
|
if (unlikely(irq >= NR_IRQS)) {
|
|
printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
|
|
__FUNCTION__, irq);
|
|
BUG();
|
|
}
|
|
|
|
exit_idle();
|
|
irq_enter();
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
stack_overflow_check(regs);
|
|
#endif
|
|
__do_IRQ(irq, regs);
|
|
irq_exit();
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
void fixup_irqs(cpumask_t map)
|
|
{
|
|
unsigned int irq;
|
|
static int warned;
|
|
|
|
for (irq = 0; irq < NR_IRQS; irq++) {
|
|
cpumask_t mask;
|
|
if (irq == 2)
|
|
continue;
|
|
|
|
cpus_and(mask, irq_desc[irq].affinity, map);
|
|
if (any_online_cpu(mask) == NR_CPUS) {
|
|
printk("Breaking affinity for irq %i\n", irq);
|
|
mask = map;
|
|
}
|
|
if (irq_desc[irq].chip->set_affinity)
|
|
irq_desc[irq].chip->set_affinity(irq, mask);
|
|
else if (irq_desc[irq].action && !(warned++))
|
|
printk("Cannot set affinity for irq %i\n", irq);
|
|
}
|
|
|
|
/* That doesn't seem sufficient. Give it 1ms. */
|
|
local_irq_enable();
|
|
mdelay(1);
|
|
local_irq_disable();
|
|
}
|
|
#endif
|
|
|
|
extern void call_softirq(void);
|
|
|
|
asmlinkage void do_softirq(void)
|
|
{
|
|
__u32 pending;
|
|
unsigned long flags;
|
|
|
|
if (in_interrupt())
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
pending = local_softirq_pending();
|
|
/* Switch to interrupt stack */
|
|
if (pending) {
|
|
call_softirq();
|
|
WARN_ON_ONCE(softirq_count());
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(do_softirq);
|