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https://github.com/torvalds/linux
synced 2026-07-22 10:10:47 +09:00
34594da765
Quite some architectures have four character wide acronyms for architecture specific interrupts like IPI, NMI, etc. The default precision of printing the Linux device interrupt numbers is three, which causes quite some code to play games with adding or omitting space after the acronym and the colon in order to keep the per CPU numbers properly aligned. Increase the default number precision to four in the core code and get rid of the space games all over the place. At the same time align all architecture specific descriptor texts left so that they show up in the same column as the interrupt chip names, which makes the output more uniform accross architectures. Fix up the GDB script to this new scheme as well. Signed-off-by: Thomas Gleixner <tglx@kernel.org> Link: https://patch.msgid.link/20260517194931.839482411@kernel.org
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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/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/random.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/io.h>
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#include <linux/uaccess.h>
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#include "irq_impl.h"
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volatile unsigned long irq_err_count;
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DEFINE_PER_CPU(unsigned long, irq_pmi_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 irq_select_affinity(unsigned int irq)
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{
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struct irq_data *data = irq_get_irq_data(irq);
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struct irq_chip *chip;
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static int last_cpu;
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int cpu = last_cpu + 1;
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if (!data)
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return 1;
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chip = irq_data_get_irq_chip(data);
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if (!chip->irq_set_affinity || irq_user_affinity[irq])
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return 1;
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while (!cpu_possible(cpu) ||
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!cpumask_test_cpu(cpu, irq_default_affinity))
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cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
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last_cpu = cpu;
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irq_data_update_affinity(data, cpumask_of(cpu));
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chip->irq_set_affinity(data, cpumask_of(cpu), false);
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return 0;
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}
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#endif /* CONFIG_SMP */
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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int j;
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#ifdef CONFIG_SMP
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seq_puts(p, " IPI: ");
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for_each_online_cpu(j)
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seq_printf(p, "%10lu ", cpu_data[j].ipi_count);
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seq_putc(p, '\n');
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#endif
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seq_puts(p, " PMI: ");
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for_each_online_cpu(j)
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seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j));
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seq_puts(p, " Performance Monitoring\n");
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seq_printf(p, " ERR: %10lu\n", irq_err_count);
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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)
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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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struct irq_desc *desc = irq_to_desc(irq);
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if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS &&
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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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generic_handle_irq_desc(desc);
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irq_exit();
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}
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