109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sw_64/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/interrupt.h>
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#include <linux/irq.h>
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#include <linux/seq_file.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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DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
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EXPORT_PER_CPU_SYMBOL(irq_stat);
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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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pr_crit("Unexpected IRQ trap at vector %u\n", irq);
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}
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u64 arch_irq_stat_cpu(unsigned int cpu)
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{
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u64 sum = per_cpu(irq_stat, cpu).timer_irqs_event;
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return sum;
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}
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u64 arch_irq_stat(void)
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{
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return 0;
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}
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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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seq_printf(p, "%*s: ", prec, "TIMER");
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for_each_online_cpu(j)
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seq_printf(p, "%10u", per_cpu(irq_stat, j).timer_irqs_event);
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seq_puts(p, "\n");
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#ifdef CONFIG_SMP
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seq_printf(p, "%*s: ", prec, "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_puts(p, "\n");
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#endif
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seq_printf(p, "%*s: ", prec, "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, "\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;
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struct irq_desc *desc = irq_to_desc(irq);
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if (!desc || ((unsigned int) 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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pr_crit("device_interrupt: invalid interrupt %d\n", 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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#ifdef CONFIG_HOTPLUG_CPU
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void fixup_irqs(void)
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{
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irq_migrate_all_off_this_cpu();
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}
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#endif
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