^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/alpha/kernel/irq.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1995 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * This file contains the code used by various IRQ handling routines:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * asking for different IRQ's should be done through these routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * instead of just grabbing them. Thus setups with different IRQ numbers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * shouldn't result in any weird surprises, and installing new handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * should be easier.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/random.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/profile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) volatile unsigned long irq_err_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) DEFINE_PER_CPU(unsigned long, irq_pmi_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void ack_bad_irq(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) irq_err_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static char irq_user_affinity[NR_IRQS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int irq_select_affinity(unsigned int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct irq_data *data = irq_get_irq_data(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct irq_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static int last_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int cpu = last_cpu + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) chip = irq_data_get_irq_chip(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (!chip->irq_set_affinity || irq_user_affinity[irq])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) while (!cpu_possible(cpu) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) !cpumask_test_cpu(cpu, irq_default_affinity))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) last_cpu = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) chip->irq_set_affinity(data, cpumask_of(cpu), false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #endif /* CONFIG_SMP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int arch_show_interrupts(struct seq_file *p, int prec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) int j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) seq_puts(p, "IPI: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) for_each_online_cpu(j)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) seq_printf(p, "%10lu ", cpu_data[j].ipi_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) seq_putc(p, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) seq_puts(p, "PMI: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) for_each_online_cpu(j)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) seq_printf(p, "%10lu ", per_cpu(irq_pmi_count, j));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) seq_puts(p, " Performance Monitoring\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) seq_printf(p, "ERR: %10lu\n", irq_err_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * handle_irq handles all normal device IRQ's (the special
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * SMP cross-CPU interrupts have their own specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * handlers).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define MAX_ILLEGAL_IRQS 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) handle_irq(int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * We ack quickly, we don't want the irq controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * thinking we're snobs just because some other CPU has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * disabled global interrupts (we have already done the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * INT_ACK cycles, it's too late to try to pretend to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * controller that we aren't taking the interrupt).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * 0 return value means that this irq is already being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * handled by some other CPU. (or is disabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static unsigned int illegal_count=0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct irq_desc *desc = irq_to_desc(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (!desc || ((unsigned) irq > ACTUAL_NR_IRQS &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) illegal_count < MAX_ILLEGAL_IRQS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) irq_err_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) illegal_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) irq_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) generic_handle_irq_desc(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) irq_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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