Merge branch 'upstream'
[linux-2.6] / arch / x86_64 / kernel / irq.c
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>
17 #include <linux/delay.h>
18 #include <asm/uaccess.h>
19 #include <asm/io_apic.h>
20 #include <asm/idle.h>
21
22 atomic_t irq_err_count;
23 #ifdef CONFIG_X86_IO_APIC
24 #ifdef APIC_MISMATCH_DEBUG
25 atomic_t irq_mis_count;
26 #endif
27 #endif
28
29 /*
30  * Generic, controller-independent functions:
31  */
32
33 int show_interrupts(struct seq_file *p, void *v)
34 {
35         int i = *(loff_t *) v, j;
36         struct irqaction * action;
37         unsigned long flags;
38
39         if (i == 0) {
40                 seq_printf(p, "           ");
41                 for_each_online_cpu(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_each_online_cpu(j)
56                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
57 #endif
58                 seq_printf(p, " %14s", irq_desc[i].handler->typename);
59
60                 seq_printf(p, "  %s", action->name);
61                 for (action=action->next; action; action = action->next)
62                         seq_printf(p, ", %s", action->name);
63                 seq_putc(p, '\n');
64 skip:
65                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
66         } else if (i == NR_IRQS) {
67                 seq_printf(p, "NMI: ");
68                 for_each_online_cpu(j)
69                         seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
70                 seq_putc(p, '\n');
71 #ifdef CONFIG_X86_LOCAL_APIC
72                 seq_printf(p, "LOC: ");
73                 for_each_online_cpu(j)
74                         seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
75                 seq_putc(p, '\n');
76 #endif
77                 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
78 #ifdef CONFIG_X86_IO_APIC
79 #ifdef APIC_MISMATCH_DEBUG
80                 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
81 #endif
82 #endif
83         }
84         return 0;
85 }
86
87 /*
88  * do_IRQ handles all normal device IRQ's (the special
89  * SMP cross-CPU interrupts have their own specific
90  * handlers).
91  */
92 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
93 {       
94         /* high bits used in ret_from_ code  */
95         unsigned irq = regs->orig_rax & 0xff;
96
97         exit_idle();
98         irq_enter();
99
100         __do_IRQ(irq, regs);
101         irq_exit();
102
103         return 1;
104 }
105
106 #ifdef CONFIG_HOTPLUG_CPU
107 void fixup_irqs(cpumask_t map)
108 {
109         unsigned int irq;
110         static int warned;
111
112         for (irq = 0; irq < NR_IRQS; irq++) {
113                 cpumask_t mask;
114                 if (irq == 2)
115                         continue;
116
117                 cpus_and(mask, irq_affinity[irq], map);
118                 if (any_online_cpu(mask) == NR_CPUS) {
119                         printk("Breaking affinity for irq %i\n", irq);
120                         mask = map;
121                 }
122                 if (irq_desc[irq].handler->set_affinity)
123                         irq_desc[irq].handler->set_affinity(irq, mask);
124                 else if (irq_desc[irq].action && !(warned++))
125                         printk("Cannot set affinity for irq %i\n", irq);
126         }
127
128         /* That doesn't seem sufficient.  Give it 1ms. */
129         local_irq_enable();
130         mdelay(1);
131         local_irq_disable();
132 }
133 #endif
134
135 extern void call_softirq(void);
136
137 asmlinkage void do_softirq(void)
138 {
139         __u32 pending;
140         unsigned long flags;
141
142         if (in_interrupt())
143                 return;
144
145         local_irq_save(flags);
146         pending = local_softirq_pending();
147         /* Switch to interrupt stack */
148         if (pending)
149                 call_softirq();
150         local_irq_restore(flags);
151 }
152 EXPORT_SYMBOL(do_softirq);