>> 1 // SPDX-License-Identifier: GPL-2.0 1 /* 2 /* 2 * Copyright (C) 2007-2009 Michal Simek <monst !! 3 * linux/arch/alpha/kernel/irq.c 3 * Copyright (C) 2007-2009 PetaLogix << 4 * Copyright (C) 2006 Atmark Techno, Inc. << 5 * 4 * 6 * This file is subject to the terms and condi !! 5 * Copyright (C) 1995 Linus Torvalds 7 * License. See the file "COPYING" in the main !! 6 * 8 * for more details. !! 7 * This file contains the code used by various IRQ handling routines: >> 8 * asking for different IRQ's should be done through these routines >> 9 * instead of just grabbing them. Thus setups with different IRQ numbers >> 10 * shouldn't result in any weird surprises, and installing new handlers >> 11 * should be easier. 9 */ 12 */ 10 13 11 #include <linux/init.h> << 12 #include <linux/ftrace.h> << 13 #include <linux/kernel.h> 14 #include <linux/kernel.h> 14 #include <linux/hardirq.h> !! 15 #include <linux/module.h> 15 #include <linux/interrupt.h> !! 16 #include <linux/errno.h> 16 #include <linux/irqflags.h> << 17 #include <linux/seq_file.h> << 18 #include <linux/kernel_stat.h> 17 #include <linux/kernel_stat.h> >> 18 #include <linux/signal.h> >> 19 #include <linux/sched.h> >> 20 #include <linux/ptrace.h> >> 21 #include <linux/interrupt.h> >> 22 #include <linux/random.h> 19 #include <linux/irq.h> 23 #include <linux/irq.h> 20 #include <linux/irqchip.h> !! 24 #include <linux/proc_fs.h> 21 #include <linux/of_irq.h> !! 25 #include <linux/seq_file.h> >> 26 #include <linux/profile.h> >> 27 #include <linux/bitops.h> >> 28 >> 29 #include <asm/io.h> >> 30 #include <linux/uaccess.h> >> 31 #include "irq_impl.h" >> 32 >> 33 volatile unsigned long irq_err_count; >> 34 DEFINE_PER_CPU(unsigned long, irq_pmi_count); 22 35 23 void __irq_entry do_IRQ(struct pt_regs *regs) !! 36 void ack_bad_irq(unsigned int irq) 24 { 37 { 25 struct pt_regs *old_regs = set_irq_reg !! 38 irq_err_count++; 26 trace_hardirqs_off(); !! 39 printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq); >> 40 } 27 41 28 irq_enter(); !! 42 #ifdef CONFIG_SMP 29 handle_arch_irq(regs); !! 43 static char irq_user_affinity[NR_IRQS]; 30 irq_exit(); !! 44 31 set_irq_regs(old_regs); !! 45 int irq_select_affinity(unsigned int irq) 32 trace_hardirqs_on(); !! 46 { >> 47 struct irq_data *data = irq_get_irq_data(irq); >> 48 struct irq_chip *chip; >> 49 static int last_cpu; >> 50 int cpu = last_cpu + 1; >> 51 >> 52 if (!data) >> 53 return 1; >> 54 chip = irq_data_get_irq_chip(data); >> 55 >> 56 if (!chip->irq_set_affinity || irq_user_affinity[irq]) >> 57 return 1; >> 58 >> 59 while (!cpu_possible(cpu) || >> 60 !cpumask_test_cpu(cpu, irq_default_affinity)) >> 61 cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0); >> 62 last_cpu = cpu; >> 63 >> 64 irq_data_update_affinity(data, cpumask_of(cpu)); >> 65 chip->irq_set_affinity(data, cpumask_of(cpu), false); >> 66 return 0; 33 } 67 } >> 68 #endif /* CONFIG_SMP */ 34 69 35 void __init init_IRQ(void) !! 70 int arch_show_interrupts(struct seq_file *p, int prec) 36 { 71 { 37 /* process the entire interrupt tree i !! 72 int j; 38 irqchip_init(); !! 73 >> 74 #ifdef CONFIG_SMP >> 75 seq_puts(p, "IPI: "); >> 76 for_each_online_cpu(j) >> 77 seq_printf(p, "%10lu ", cpu_data[j].ipi_count); >> 78 seq_putc(p, '\n'); >> 79 #endif >> 80 seq_puts(p, "PMI: "); >> 81 for_each_online_cpu(j) >> 82 seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j)); >> 83 seq_puts(p, " Performance Monitoring\n"); >> 84 seq_printf(p, "ERR: %10lu\n", irq_err_count); >> 85 return 0; >> 86 } >> 87 >> 88 /* >> 89 * handle_irq handles all normal device IRQ's (the special >> 90 * SMP cross-CPU interrupts have their own specific >> 91 * handlers). >> 92 */ >> 93 >> 94 #define MAX_ILLEGAL_IRQS 16 >> 95 >> 96 void >> 97 handle_irq(int irq) >> 98 { >> 99 /* >> 100 * We ack quickly, we don't want the irq controller >> 101 * thinking we're snobs just because some other CPU has >> 102 * disabled global interrupts (we have already done the >> 103 * INT_ACK cycles, it's too late to try to pretend to the >> 104 * controller that we aren't taking the interrupt). >> 105 * >> 106 * 0 return value means that this irq is already being >> 107 * handled by some other CPU. (or is disabled) >> 108 */ >> 109 static unsigned int illegal_count=0; >> 110 struct irq_desc *desc = irq_to_desc(irq); >> 111 >> 112 if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS && >> 113 illegal_count < MAX_ILLEGAL_IRQS)) { >> 114 irq_err_count++; >> 115 illegal_count++; >> 116 printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n", >> 117 irq); >> 118 return; >> 119 } >> 120 >> 121 irq_enter(); >> 122 generic_handle_irq_desc(desc); >> 123 irq_exit(); 39 } 124 } 40 125
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