Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/alpha/kernel/irq.c |
| 3 | * |
| 4 | * Copyright (C) 1995 Linus Torvalds |
| 5 | * |
| 6 | * This file contains the code used by various IRQ handling routines: |
| 7 | * asking for different IRQ's should be done through these routines |
| 8 | * instead of just grabbing them. Thus setups with different IRQ numbers |
| 9 | * shouldn't result in any weird surprises, and installing new handlers |
| 10 | * should be easier. |
| 11 | */ |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/kernel_stat.h> |
| 17 | #include <linux/signal.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/ptrace.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/random.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/irq.h> |
| 25 | #include <linux/proc_fs.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | #include <linux/profile.h> |
| 28 | #include <linux/bitops.h> |
| 29 | |
| 30 | #include <asm/system.h> |
| 31 | #include <asm/io.h> |
| 32 | #include <asm/uaccess.h> |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | volatile unsigned long irq_err_count; |
| 35 | |
Ivan Kokshaysky | 0595bf3 | 2006-01-06 00:12:22 -0800 | [diff] [blame] | 36 | void ack_bad_irq(unsigned int irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | { |
| 38 | irq_err_count++; |
| 39 | printk(KERN_CRIT "Unexpected IRQ trap at vector %u\n", irq); |
| 40 | } |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | static char irq_user_affinity[NR_IRQS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Ivan Kokshaysky | 0595bf3 | 2006-01-06 00:12:22 -0800 | [diff] [blame] | 45 | int |
| 46 | select_smp_affinity(unsigned int irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | { |
| 48 | static int last_cpu; |
| 49 | int cpu = last_cpu + 1; |
| 50 | |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 51 | if (!irq_desc[irq].chip->set_affinity || irq_user_affinity[irq]) |
Ivan Kokshaysky | 0595bf3 | 2006-01-06 00:12:22 -0800 | [diff] [blame] | 52 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | while (!cpu_possible(cpu)) |
| 55 | cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0); |
| 56 | last_cpu = cpu; |
| 57 | |
Ingo Molnar | a53da52 | 2006-06-29 02:24:38 -0700 | [diff] [blame] | 58 | irq_desc[irq].affinity = cpumask_of_cpu(cpu); |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 59 | irq_desc[irq].chip->set_affinity(irq, cpumask_of_cpu(cpu)); |
Ivan Kokshaysky | 0595bf3 | 2006-01-06 00:12:22 -0800 | [diff] [blame] | 60 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #endif /* CONFIG_SMP */ |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | int |
| 65 | show_interrupts(struct seq_file *p, void *v) |
| 66 | { |
| 67 | #ifdef CONFIG_SMP |
| 68 | int j; |
| 69 | #endif |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 70 | int irq = *(loff_t *) v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | struct irqaction * action; |
| 72 | unsigned long flags; |
| 73 | |
| 74 | #ifdef CONFIG_SMP |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 75 | if (irq == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | seq_puts(p, " "); |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 77 | for_each_online_cpu(j) |
| 78 | seq_printf(p, "CPU%d ", j); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | seq_putc(p, '\n'); |
| 80 | } |
| 81 | #endif |
| 82 | |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 83 | if (irq < ACTUAL_NR_IRQS) { |
| 84 | spin_lock_irqsave(&irq_desc[irq].lock, flags); |
| 85 | action = irq_desc[irq].action; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | if (!action) |
| 87 | goto unlock; |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 88 | seq_printf(p, "%3d: ", irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #ifndef CONFIG_SMP |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 90 | seq_printf(p, "%10u ", kstat_irqs(irq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | #else |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 92 | for_each_online_cpu(j) |
| 93 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[irq]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #endif |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 95 | seq_printf(p, " %14s", irq_desc[irq].chip->typename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | seq_printf(p, " %c%s", |
Thomas Gleixner | d18eced | 2006-07-01 19:29:11 -0700 | [diff] [blame] | 97 | (action->flags & IRQF_DISABLED)?'+':' ', |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | action->name); |
| 99 | |
| 100 | for (action=action->next; action; action = action->next) { |
| 101 | seq_printf(p, ", %c%s", |
Thomas Gleixner | d18eced | 2006-07-01 19:29:11 -0700 | [diff] [blame] | 102 | (action->flags & IRQF_DISABLED)?'+':' ', |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | action->name); |
| 104 | } |
| 105 | |
| 106 | seq_putc(p, '\n'); |
| 107 | unlock: |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 108 | spin_unlock_irqrestore(&irq_desc[irq].lock, flags); |
| 109 | } else if (irq == ACTUAL_NR_IRQS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #ifdef CONFIG_SMP |
| 111 | seq_puts(p, "IPI: "); |
Eric Sesterhenn | c5e3d98 | 2006-02-01 03:06:13 -0800 | [diff] [blame] | 112 | for_each_online_cpu(j) |
| 113 | seq_printf(p, "%10lu ", cpu_data[j].ipi_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | seq_putc(p, '\n'); |
| 115 | #endif |
| 116 | seq_printf(p, "ERR: %10lu\n", irq_err_count); |
| 117 | } |
| 118 | return 0; |
| 119 | } |
| 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | /* |
| 122 | * handle_irq handles all normal device IRQ's (the special |
| 123 | * SMP cross-CPU interrupts have their own specific |
| 124 | * handlers). |
| 125 | */ |
| 126 | |
| 127 | #define MAX_ILLEGAL_IRQS 16 |
| 128 | |
| 129 | void |
Al Viro | 3dbb8c6 | 2006-10-08 14:37:32 +0100 | [diff] [blame] | 130 | handle_irq(int irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
| 132 | /* |
| 133 | * We ack quickly, we don't want the irq controller |
| 134 | * thinking we're snobs just because some other CPU has |
| 135 | * disabled global interrupts (we have already done the |
| 136 | * INT_ACK cycles, it's too late to try to pretend to the |
| 137 | * controller that we aren't taking the interrupt). |
| 138 | * |
| 139 | * 0 return value means that this irq is already being |
| 140 | * handled by some other CPU. (or is disabled) |
| 141 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | static unsigned int illegal_count=0; |
| 143 | |
| 144 | if ((unsigned) irq > ACTUAL_NR_IRQS && illegal_count < MAX_ILLEGAL_IRQS ) { |
| 145 | irq_err_count++; |
| 146 | illegal_count++; |
| 147 | printk(KERN_CRIT "device_interrupt: invalid interrupt %d\n", |
| 148 | irq); |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | irq_enter(); |
Ivan Kokshaysky | eff2c2f | 2006-03-09 17:33:37 -0800 | [diff] [blame] | 153 | /* |
| 154 | * __do_IRQ() must be called with IPL_MAX. Note that we do not |
| 155 | * explicitly enable interrupts afterwards - some MILO PALcode |
| 156 | * (namely LX164 one) seems to have severe problems with RTI |
| 157 | * at IPL 0. |
| 158 | */ |
Ivan Kokshaysky | 0595bf3 | 2006-01-06 00:12:22 -0800 | [diff] [blame] | 159 | local_irq_disable(); |
Al Viro | 8774cb8 | 2006-10-07 14:17:31 +0100 | [diff] [blame] | 160 | __do_IRQ(irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | irq_exit(); |
| 162 | } |