cc3fb85f51459141be2519243b8e752d5371f3d9
[linux-2.6.git] / 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
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
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