1 // SPDX-License-Identifier: GPL-2.0-only !! 1 // SPDX-License-Identifier: GPL-2.0 2 /* 2 /* 3 * Copyright (C) 2011-12 Synopsys, Inc. (www.s !! 3 * linux/arch/alpha/kernel/irq.c >> 4 * >> 5 * Copyright (C) 1995 Linus Torvalds >> 6 * >> 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. 4 */ 12 */ 5 13 >> 14 #include <linux/kernel.h> >> 15 #include <linux/module.h> >> 16 #include <linux/errno.h> >> 17 #include <linux/kernel_stat.h> >> 18 #include <linux/signal.h> >> 19 #include <linux/sched.h> >> 20 #include <linux/ptrace.h> 6 #include <linux/interrupt.h> 21 #include <linux/interrupt.h> 7 #include <linux/irqchip.h> !! 22 #include <linux/random.h> 8 #include <asm/mach_desc.h> !! 23 #include <linux/irq.h> >> 24 #include <linux/proc_fs.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" 9 32 10 #include <asm/irq_regs.h> !! 33 volatile unsigned long irq_err_count; 11 #include <asm/smp.h> !! 34 DEFINE_PER_CPU(unsigned long, irq_pmi_count); 12 35 13 /* !! 36 void ack_bad_irq(unsigned int irq) 14 * Late Interrupt system init called from star << 15 * << 16 * Since slab must already be initialized, pla << 17 * needed request_irq( )s << 18 */ << 19 void __init init_IRQ(void) << 20 { 37 { 21 /* !! 38 irq_err_count++; 22 * process the entire interrupt tree i !! 39 printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq); 23 * Any external intc will be setup pro !! 40 } 24 * properly !! 41 25 */ !! 42 #ifdef CONFIG_SMP 26 irqchip_init(); !! 43 static char irq_user_affinity[NR_IRQS]; >> 44 >> 45 int irq_select_affinity(unsigned int irq) >> 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; >> 67 } >> 68 #endif /* CONFIG_SMP */ >> 69 >> 70 int arch_show_interrupts(struct seq_file *p, int prec) >> 71 { >> 72 int j; 27 73 28 #ifdef CONFIG_SMP 74 #ifdef CONFIG_SMP 29 /* a SMP H/w block could do IPI IRQ re !! 75 seq_puts(p, "IPI: "); 30 if (plat_smp_ops.init_per_cpu) !! 76 for_each_online_cpu(j) 31 plat_smp_ops.init_per_cpu(smp_ !! 77 seq_printf(p, "%10lu ", cpu_data[j].ipi_count); >> 78 seq_putc(p, '\n'); 32 #endif 79 #endif 33 !! 80 seq_puts(p, "PMI: "); 34 if (machine_desc->init_per_cpu) !! 81 for_each_online_cpu(j) 35 machine_desc->init_per_cpu(smp !! 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; 36 } 86 } 37 87 38 /* 88 /* 39 * "C" Entry point for any ARC ISR, called fro !! 89 * handle_irq handles all normal device IRQ's (the special 40 * @irq is the vector number read from ICAUSE !! 90 * SMP cross-CPU interrupts have their own specific >> 91 * handlers). 41 */ 92 */ 42 void arch_do_IRQ(unsigned int hwirq, struct pt !! 93 43 { !! 94 #define MAX_ILLEGAL_IRQS 16 44 struct pt_regs *old_regs; !! 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 } 45 120 46 irq_enter(); 121 irq_enter(); 47 old_regs = set_irq_regs(regs); !! 122 generic_handle_irq_desc(desc); 48 generic_handle_domain_irq(NULL, hwirq) << 49 set_irq_regs(old_regs); << 50 irq_exit(); 123 irq_exit(); 51 } 124 } 52 125
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