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![Dave Jones](/assets/img/avatar_default.png)
Since the x86 merge, lots of files that referenced their own filenames are no longer correct. Rather than keep them up to date, just delete them, as they add no real value. Additionally: - fix up comment formatting in scx200_32.c - Remove a credit from myself in setup_64.c from a time when we had no SCM - remove longwinded history from tsc_32.c which can be figured out from git. Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
210 lines
4.8 KiB
C
210 lines
4.8 KiB
C
/*
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* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
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*
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* This file contains the lowest level x86_64-specific interrupt
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* entry and irq statistics code. All the remaining irq logic is
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* done by the generic kernel/irq/ code and in the
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* x86_64-specific irq controller code. (e.g. i8259.c and
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* io_apic.c.)
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*/
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/io_apic.h>
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#include <asm/idle.h>
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#include <asm/smp.h>
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atomic_t irq_err_count;
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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/*
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* Probabilistic stack overflow check:
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*
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* Only check the stack in process context, because everything else
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* runs on the big interrupt stacks. Checking reliably is too expensive,
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* so we just check from interrupts.
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*/
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static inline void stack_overflow_check(struct pt_regs *regs)
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{
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u64 curbase = (u64)task_stack_page(current);
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static unsigned long warned = -60*HZ;
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if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
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regs->rsp < curbase + sizeof(struct thread_info) + 128 &&
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time_after(jiffies, warned + 60*HZ)) {
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printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
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current->comm, curbase, regs->rsp);
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show_stack(NULL,NULL);
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warned = jiffies;
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}
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}
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#endif
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/*
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* Generic, controller-independent functions:
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*/
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, j;
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struct irqaction * action;
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unsigned long flags;
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if (i == 0) {
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seq_printf(p, " ");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%-8d",j);
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seq_putc(p, '\n');
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}
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if (i < 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 skip;
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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_each_online_cpu(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, " %8s", irq_desc[i].chip->name);
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seq_printf(p, "-%-8s", irq_desc[i].name);
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seq_printf(p, " %s", action->name);
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for (action=action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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skip:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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} else if (i == NR_IRQS) {
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seq_printf(p, "NMI: ");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
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seq_putc(p, '\n');
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seq_printf(p, "LOC: ");
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
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seq_putc(p, '\n');
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seq_printf(p, "ERR: %10u\n", atomic_read(&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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* do_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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asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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/* high bit used in ret_from_ code */
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unsigned vector = ~regs->orig_rax;
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unsigned irq;
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exit_idle();
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irq_enter();
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irq = __get_cpu_var(vector_irq)[vector];
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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stack_overflow_check(regs);
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#endif
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if (likely(irq < NR_IRQS))
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generic_handle_irq(irq);
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else {
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if (!disable_apic)
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ack_APIC_irq();
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if (printk_ratelimit())
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printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",
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__func__, smp_processor_id(), vector);
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}
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irq_exit();
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set_irq_regs(old_regs);
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return 1;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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void fixup_irqs(cpumask_t map)
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{
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unsigned int irq;
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static int warned;
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for (irq = 0; irq < NR_IRQS; irq++) {
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cpumask_t mask;
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int break_affinity = 0;
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int set_affinity = 1;
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if (irq == 2)
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continue;
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/* interrupt's are disabled at this point */
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spin_lock(&irq_desc[irq].lock);
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if (!irq_has_action(irq) ||
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cpus_equal(irq_desc[irq].affinity, map)) {
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spin_unlock(&irq_desc[irq].lock);
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continue;
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}
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cpus_and(mask, irq_desc[irq].affinity, map);
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if (cpus_empty(mask)) {
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break_affinity = 1;
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mask = map;
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}
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if (irq_desc[irq].chip->mask)
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irq_desc[irq].chip->mask(irq);
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if (irq_desc[irq].chip->set_affinity)
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irq_desc[irq].chip->set_affinity(irq, mask);
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else if (!(warned++))
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set_affinity = 0;
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if (irq_desc[irq].chip->unmask)
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irq_desc[irq].chip->unmask(irq);
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spin_unlock(&irq_desc[irq].lock);
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if (break_affinity && set_affinity)
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printk("Broke affinity for irq %i\n", irq);
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else if (!set_affinity)
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printk("Cannot set affinity for irq %i\n", irq);
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}
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/* That doesn't seem sufficient. Give it 1ms. */
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local_irq_enable();
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mdelay(1);
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local_irq_disable();
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}
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#endif
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extern void call_softirq(void);
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asmlinkage void do_softirq(void)
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{
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__u32 pending;
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unsigned long flags;
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if (in_interrupt())
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return;
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local_irq_save(flags);
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pending = local_softirq_pending();
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/* Switch to interrupt stack */
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if (pending) {
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call_softirq();
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WARN_ON_ONCE(softirq_count());
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}
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local_irq_restore(flags);
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}
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