Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/kernel/irq.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar |
| 5 | * |
| 6 | * This file contains the lowest level x86_64-specific interrupt |
| 7 | * entry and irq statistics code. All the remaining irq logic is |
| 8 | * done by the generic kernel/irq/ code and in the |
| 9 | * x86_64-specific irq controller code. (e.g. i8259.c and |
| 10 | * io_apic.c.) |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel_stat.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/seq_file.h> |
| 16 | #include <linux/module.h> |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 17 | #include <linux/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/uaccess.h> |
| 19 | #include <asm/io_apic.h> |
| 20 | |
| 21 | atomic_t irq_err_count; |
| 22 | #ifdef CONFIG_X86_IO_APIC |
| 23 | #ifdef APIC_MISMATCH_DEBUG |
| 24 | atomic_t irq_mis_count; |
| 25 | #endif |
| 26 | #endif |
| 27 | |
| 28 | /* |
| 29 | * Generic, controller-independent functions: |
| 30 | */ |
| 31 | |
| 32 | int show_interrupts(struct seq_file *p, void *v) |
| 33 | { |
| 34 | int i = *(loff_t *) v, j; |
| 35 | struct irqaction * action; |
| 36 | unsigned long flags; |
| 37 | |
| 38 | if (i == 0) { |
| 39 | seq_printf(p, " "); |
| 40 | for (j=0; j<NR_CPUS; j++) |
| 41 | if (cpu_online(j)) |
| 42 | seq_printf(p, "CPU%d ",j); |
| 43 | seq_putc(p, '\n'); |
| 44 | } |
| 45 | |
| 46 | if (i < NR_IRQS) { |
| 47 | spin_lock_irqsave(&irq_desc[i].lock, flags); |
| 48 | action = irq_desc[i].action; |
| 49 | if (!action) |
| 50 | goto skip; |
| 51 | seq_printf(p, "%3d: ",i); |
| 52 | #ifndef CONFIG_SMP |
| 53 | seq_printf(p, "%10u ", kstat_irqs(i)); |
| 54 | #else |
| 55 | for (j=0; j<NR_CPUS; j++) |
| 56 | if (cpu_online(j)) |
| 57 | seq_printf(p, "%10u ", |
| 58 | kstat_cpu(j).irqs[i]); |
| 59 | #endif |
| 60 | seq_printf(p, " %14s", irq_desc[i].handler->typename); |
| 61 | |
| 62 | seq_printf(p, " %s", action->name); |
| 63 | for (action=action->next; action; action = action->next) |
| 64 | seq_printf(p, ", %s", action->name); |
| 65 | seq_putc(p, '\n'); |
| 66 | skip: |
| 67 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
| 68 | } else if (i == NR_IRQS) { |
| 69 | seq_printf(p, "NMI: "); |
| 70 | for (j = 0; j < NR_CPUS; j++) |
| 71 | if (cpu_online(j)) |
| 72 | seq_printf(p, "%10u ", cpu_pda[j].__nmi_count); |
| 73 | seq_putc(p, '\n'); |
| 74 | #ifdef CONFIG_X86_LOCAL_APIC |
| 75 | seq_printf(p, "LOC: "); |
| 76 | for (j = 0; j < NR_CPUS; j++) |
| 77 | if (cpu_online(j)) |
| 78 | seq_printf(p, "%10u ", cpu_pda[j].apic_timer_irqs); |
| 79 | seq_putc(p, '\n'); |
| 80 | #endif |
| 81 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); |
| 82 | #ifdef CONFIG_X86_IO_APIC |
| 83 | #ifdef APIC_MISMATCH_DEBUG |
| 84 | seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count)); |
| 85 | #endif |
| 86 | #endif |
| 87 | } |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * do_IRQ handles all normal device IRQ's (the special |
| 93 | * SMP cross-CPU interrupts have their own specific |
| 94 | * handlers). |
| 95 | */ |
| 96 | asmlinkage unsigned int do_IRQ(struct pt_regs *regs) |
| 97 | { |
| 98 | /* high bits used in ret_from_ code */ |
| 99 | unsigned irq = regs->orig_rax & 0xff; |
| 100 | |
| 101 | irq_enter(); |
| 102 | BUG_ON(irq > 256); |
| 103 | |
| 104 | __do_IRQ(irq, regs); |
| 105 | irq_exit(); |
| 106 | |
| 107 | return 1; |
| 108 | } |
| 109 | |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 110 | #ifdef CONFIG_HOTPLUG_CPU |
| 111 | void fixup_irqs(cpumask_t map) |
| 112 | { |
| 113 | unsigned int irq; |
| 114 | static int warned; |
| 115 | |
| 116 | for (irq = 0; irq < NR_IRQS; irq++) { |
| 117 | cpumask_t mask; |
| 118 | if (irq == 2) |
| 119 | continue; |
| 120 | |
| 121 | cpus_and(mask, irq_affinity[irq], map); |
| 122 | if (any_online_cpu(mask) == NR_CPUS) { |
| 123 | printk("Breaking affinity for irq %i\n", irq); |
| 124 | mask = map; |
| 125 | } |
| 126 | if (irq_desc[irq].handler->set_affinity) |
| 127 | irq_desc[irq].handler->set_affinity(irq, mask); |
| 128 | else if (irq_desc[irq].action && !(warned++)) |
| 129 | printk("Cannot set affinity for irq %i\n", irq); |
| 130 | } |
| 131 | |
| 132 | /* That doesn't seem sufficient. Give it 1ms. */ |
| 133 | local_irq_enable(); |
| 134 | mdelay(1); |
| 135 | local_irq_disable(); |
| 136 | } |
| 137 | #endif |
Andi Kleen | ed6b676 | 2005-07-28 21:15:49 -0700 | [diff] [blame] | 138 | |
| 139 | extern void call_softirq(void); |
| 140 | |
| 141 | asmlinkage void do_softirq(void) |
| 142 | { |
| 143 | __u32 pending; |
| 144 | unsigned long flags; |
| 145 | |
| 146 | if (in_interrupt()) |
| 147 | return; |
| 148 | |
| 149 | local_irq_save(flags); |
| 150 | pending = local_softirq_pending(); |
| 151 | /* Switch to interrupt stack */ |
| 152 | if (pending) |
| 153 | call_softirq(); |
| 154 | local_irq_restore(flags); |
| 155 | } |
| 156 | EXPORT_SYMBOL(do_softirq); |