[PATCH] powerpc: Expose SMT and L1 icache snoop userland features
[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 #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 (j=0; j<NR_CPUS; j++)
42                         if (cpu_online(j))
43                                 seq_printf(p, "CPU%d       ",j);
44                 seq_putc(p, '\n');
45         }
46
47         if (i < NR_IRQS) {
48                 spin_lock_irqsave(&irq_desc[i].lock, flags);
49                 action = irq_desc[i].action;
50                 if (!action) 
51                         goto skip;
52                 seq_printf(p, "%3d: ",i);
53 #ifndef CONFIG_SMP
54                 seq_printf(p, "%10u ", kstat_irqs(i));
55 #else
56                 for (j=0; j<NR_CPUS; j++)
57                         if (cpu_online(j))
58                         seq_printf(p, "%10u ",
59                                 kstat_cpu(j).irqs[i]);
60 #endif
61                 seq_printf(p, " %14s", irq_desc[i].handler->typename);
62
63                 seq_printf(p, "  %s", action->name);
64                 for (action=action->next; action; action = action->next)
65                         seq_printf(p, ", %s", action->name);
66                 seq_putc(p, '\n');
67 skip:
68                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
69         } else if (i == NR_IRQS) {
70                 seq_printf(p, "NMI: ");
71                 for (j = 0; j < NR_CPUS; j++)
72                         if (cpu_online(j))
73                                 seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
74                 seq_putc(p, '\n');
75 #ifdef CONFIG_X86_LOCAL_APIC
76                 seq_printf(p, "LOC: ");
77                 for (j = 0; j < NR_CPUS; j++)
78                         if (cpu_online(j))
79                                 seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
80                 seq_putc(p, '\n');
81 #endif
82                 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
83 #ifdef CONFIG_X86_IO_APIC
84 #ifdef APIC_MISMATCH_DEBUG
85                 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
86 #endif
87 #endif
88         }
89         return 0;
90 }
91
92 /*
93  * do_IRQ handles all normal device IRQ's (the special
94  * SMP cross-CPU interrupts have their own specific
95  * handlers).
96  */
97 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
98 {       
99         /* high bits used in ret_from_ code  */
100         unsigned irq = regs->orig_rax & 0xff;
101
102         exit_idle();
103         irq_enter();
104
105         __do_IRQ(irq, regs);
106         irq_exit();
107
108         return 1;
109 }
110
111 #ifdef CONFIG_HOTPLUG_CPU
112 void fixup_irqs(cpumask_t map)
113 {
114         unsigned int irq;
115         static int warned;
116
117         for (irq = 0; irq < NR_IRQS; irq++) {
118                 cpumask_t mask;
119                 if (irq == 2)
120                         continue;
121
122                 cpus_and(mask, irq_affinity[irq], map);
123                 if (any_online_cpu(mask) == NR_CPUS) {
124                         printk("Breaking affinity for irq %i\n", irq);
125                         mask = map;
126                 }
127                 if (irq_desc[irq].handler->set_affinity)
128                         irq_desc[irq].handler->set_affinity(irq, mask);
129                 else if (irq_desc[irq].action && !(warned++))
130                         printk("Cannot set affinity for irq %i\n", irq);
131         }
132
133         /* That doesn't seem sufficient.  Give it 1ms. */
134         local_irq_enable();
135         mdelay(1);
136         local_irq_disable();
137 }
138 #endif
139
140 extern void call_softirq(void);
141
142 asmlinkage void do_softirq(void)
143 {
144         __u32 pending;
145         unsigned long flags;
146
147         if (in_interrupt())
148                 return;
149
150         local_irq_save(flags);
151         pending = local_softirq_pending();
152         /* Switch to interrupt stack */
153         if (pending)
154                 call_softirq();
155         local_irq_restore(flags);
156 }
157 EXPORT_SYMBOL(do_softirq);