x86_64: move kernel
[linux-2.6.git] / arch / x86 / kernel / irq_64.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 #include <asm/smp.h>
22
23 atomic_t irq_err_count;
24
25 #ifdef CONFIG_DEBUG_STACKOVERFLOW
26 /*
27  * Probabilistic stack overflow check:
28  *
29  * Only check the stack in process context, because everything else
30  * runs on the big interrupt stacks. Checking reliably is too expensive,
31  * so we just check from interrupts.
32  */
33 static inline void stack_overflow_check(struct pt_regs *regs)
34 {
35         u64 curbase = (u64)task_stack_page(current);
36         static unsigned long warned = -60*HZ;
37
38         if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
39             regs->rsp <  curbase + sizeof(struct thread_info) + 128 &&
40             time_after(jiffies, warned + 60*HZ)) {
41                 printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
42                        current->comm, curbase, regs->rsp);
43                 show_stack(NULL,NULL);
44                 warned = jiffies;
45         }
46 }
47 #endif
48
49 /*
50  * Generic, controller-independent functions:
51  */
52
53 int show_interrupts(struct seq_file *p, void *v)
54 {
55         int i = *(loff_t *) v, j;
56         struct irqaction * action;
57         unsigned long flags;
58
59         if (i == 0) {
60                 seq_printf(p, "           ");
61                 for_each_online_cpu(j)
62                         seq_printf(p, "CPU%-8d",j);
63                 seq_putc(p, '\n');
64         }
65
66         if (i < NR_IRQS) {
67                 spin_lock_irqsave(&irq_desc[i].lock, flags);
68                 action = irq_desc[i].action;
69                 if (!action) 
70                         goto skip;
71                 seq_printf(p, "%3d: ",i);
72 #ifndef CONFIG_SMP
73                 seq_printf(p, "%10u ", kstat_irqs(i));
74 #else
75                 for_each_online_cpu(j)
76                         seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
77 #endif
78                 seq_printf(p, " %8s", irq_desc[i].chip->name);
79                 seq_printf(p, "-%-8s", irq_desc[i].name);
80
81                 seq_printf(p, "  %s", action->name);
82                 for (action=action->next; action; action = action->next)
83                         seq_printf(p, ", %s", action->name);
84                 seq_putc(p, '\n');
85 skip:
86                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
87         } else if (i == NR_IRQS) {
88                 seq_printf(p, "NMI: ");
89                 for_each_online_cpu(j)
90                         seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
91                 seq_putc(p, '\n');
92                 seq_printf(p, "LOC: ");
93                 for_each_online_cpu(j)
94                         seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
95                 seq_putc(p, '\n');
96                 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
97         }
98         return 0;
99 }
100
101 /*
102  * do_IRQ handles all normal device IRQ's (the special
103  * SMP cross-CPU interrupts have their own specific
104  * handlers).
105  */
106 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
107 {
108         struct pt_regs *old_regs = set_irq_regs(regs);
109
110         /* high bit used in ret_from_ code  */
111         unsigned vector = ~regs->orig_rax;
112         unsigned irq;
113
114         exit_idle();
115         irq_enter();
116         irq = __get_cpu_var(vector_irq)[vector];
117
118 #ifdef CONFIG_DEBUG_STACKOVERFLOW
119         stack_overflow_check(regs);
120 #endif
121
122         if (likely(irq < NR_IRQS))
123                 generic_handle_irq(irq);
124         else {
125                 if (!disable_apic)
126                         ack_APIC_irq();
127
128                 if (printk_ratelimit())
129                         printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",
130                                 __func__, smp_processor_id(), vector);
131         }
132
133         irq_exit();
134
135         set_irq_regs(old_regs);
136         return 1;
137 }
138
139 #ifdef CONFIG_HOTPLUG_CPU
140 void fixup_irqs(cpumask_t map)
141 {
142         unsigned int irq;
143         static int warned;
144
145         for (irq = 0; irq < NR_IRQS; irq++) {
146                 cpumask_t mask;
147                 int break_affinity = 0;
148                 int set_affinity = 1;
149
150                 if (irq == 2)
151                         continue;
152
153                 /* interrupt's are disabled at this point */
154                 spin_lock(&irq_desc[irq].lock);
155
156                 if (!irq_has_action(irq) ||
157                     cpus_equal(irq_desc[irq].affinity, map)) {
158                         spin_unlock(&irq_desc[irq].lock);
159                         continue;
160                 }
161
162                 cpus_and(mask, irq_desc[irq].affinity, map);
163                 if (cpus_empty(mask)) {
164                         break_affinity = 1;
165                         mask = map;
166                 }
167
168                 if (irq_desc[irq].chip->mask)
169                         irq_desc[irq].chip->mask(irq);
170
171                 if (irq_desc[irq].chip->set_affinity)
172                         irq_desc[irq].chip->set_affinity(irq, mask);
173                 else if (!(warned++))
174                         set_affinity = 0;
175
176                 if (irq_desc[irq].chip->unmask)
177                         irq_desc[irq].chip->unmask(irq);
178
179                 spin_unlock(&irq_desc[irq].lock);
180
181                 if (break_affinity && set_affinity)
182                         printk("Broke affinity for irq %i\n", irq);
183                 else if (!set_affinity)
184                         printk("Cannot set affinity for irq %i\n", irq);
185         }
186
187         /* That doesn't seem sufficient.  Give it 1ms. */
188         local_irq_enable();
189         mdelay(1);
190         local_irq_disable();
191 }
192 #endif
193
194 extern void call_softirq(void);
195
196 asmlinkage void do_softirq(void)
197 {
198         __u32 pending;
199         unsigned long flags;
200
201         if (in_interrupt())
202                 return;
203
204         local_irq_save(flags);
205         pending = local_softirq_pending();
206         /* Switch to interrupt stack */
207         if (pending) {
208                 call_softirq();
209                 WARN_ON_ONCE(softirq_count());
210         }
211         local_irq_restore(flags);
212 }
213 EXPORT_SYMBOL(do_softirq);