2 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
4 * This file contains the lowest level x86_64-specific interrupt
5 * entry and irq statistics code. All the remaining irq logic is
6 * done by the generic kernel/irq/ code and in the
7 * x86_64-specific irq controller code. (e.g. i8259.c and
11 #include <linux/kernel_stat.h>
12 #include <linux/interrupt.h>
13 #include <linux/seq_file.h>
14 #include <linux/module.h>
15 #include <linux/delay.h>
16 #include <asm/uaccess.h>
17 #include <asm/io_apic.h>
21 atomic_t irq_err_count;
23 #ifdef CONFIG_DEBUG_STACKOVERFLOW
25 * Probabilistic stack overflow check:
27 * Only check the stack in process context, because everything else
28 * runs on the big interrupt stacks. Checking reliably is too expensive,
29 * so we just check from interrupts.
31 static inline void stack_overflow_check(struct pt_regs *regs)
33 u64 curbase = (u64)task_stack_page(current);
34 static unsigned long warned = -60*HZ;
36 if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
37 regs->rsp < curbase + sizeof(struct thread_info) + 128 &&
38 time_after(jiffies, warned + 60*HZ)) {
39 printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
40 current->comm, curbase, regs->rsp);
41 show_stack(NULL,NULL);
48 * Generic, controller-independent functions:
51 int show_interrupts(struct seq_file *p, void *v)
53 int i = *(loff_t *) v, j;
54 struct irqaction * action;
59 for_each_online_cpu(j)
60 seq_printf(p, "CPU%-8d",j);
65 unsigned any_count = 0;
67 spin_lock_irqsave(&irq_desc[i].lock, flags);
69 any_count = kstat_irqs(i);
71 for_each_online_cpu(j)
72 any_count |= kstat_cpu(j).irqs[i];
74 action = irq_desc[i].action;
75 if (!action && !any_count)
77 seq_printf(p, "%3d: ",i);
79 seq_printf(p, "%10u ", kstat_irqs(i));
81 for_each_online_cpu(j)
82 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
84 seq_printf(p, " %8s", irq_desc[i].chip->name);
85 seq_printf(p, "-%-8s", irq_desc[i].name);
88 seq_printf(p, " %s", action->name);
89 while ((action = action->next) != NULL)
90 seq_printf(p, ", %s", action->name);
94 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
95 } else if (i == NR_IRQS) {
96 seq_printf(p, "NMI: ");
97 for_each_online_cpu(j)
98 seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
99 seq_printf(p, " Non-maskable interrupts\n");
100 seq_printf(p, "LOC: ");
101 for_each_online_cpu(j)
102 seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
103 seq_printf(p, " Local timer interrupts\n");
105 seq_printf(p, "RES: ");
106 for_each_online_cpu(j)
107 seq_printf(p, "%10u ", cpu_pda(j)->irq_resched_count);
108 seq_printf(p, " Rescheduling interrupts\n");
109 seq_printf(p, "CAL: ");
110 for_each_online_cpu(j)
111 seq_printf(p, "%10u ", cpu_pda(j)->irq_call_count);
112 seq_printf(p, " function call interrupts\n");
113 seq_printf(p, "TLB: ");
114 for_each_online_cpu(j)
115 seq_printf(p, "%10u ", cpu_pda(j)->irq_tlb_count);
116 seq_printf(p, " TLB shootdowns\n");
118 seq_printf(p, "TRM: ");
119 for_each_online_cpu(j)
120 seq_printf(p, "%10u ", cpu_pda(j)->irq_thermal_count);
121 seq_printf(p, " Thermal event interrupts\n");
122 seq_printf(p, "THR: ");
123 for_each_online_cpu(j)
124 seq_printf(p, "%10u ", cpu_pda(j)->irq_threshold_count);
125 seq_printf(p, " Threshold APIC interrupts\n");
126 seq_printf(p, "SPU: ");
127 for_each_online_cpu(j)
128 seq_printf(p, "%10u ", cpu_pda(j)->irq_spurious_count);
129 seq_printf(p, " Spurious interrupts\n");
130 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
136 * do_IRQ handles all normal device IRQ's (the special
137 * SMP cross-CPU interrupts have their own specific
140 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
142 struct pt_regs *old_regs = set_irq_regs(regs);
144 /* high bit used in ret_from_ code */
145 unsigned vector = ~regs->orig_rax;
150 irq = __get_cpu_var(vector_irq)[vector];
152 #ifdef CONFIG_DEBUG_STACKOVERFLOW
153 stack_overflow_check(regs);
156 if (likely(irq < NR_IRQS))
157 generic_handle_irq(irq);
162 if (printk_ratelimit())
163 printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",
164 __func__, smp_processor_id(), vector);
169 set_irq_regs(old_regs);
173 #ifdef CONFIG_HOTPLUG_CPU
174 void fixup_irqs(cpumask_t map)
179 for (irq = 0; irq < NR_IRQS; irq++) {
181 int break_affinity = 0;
182 int set_affinity = 1;
187 /* interrupt's are disabled at this point */
188 spin_lock(&irq_desc[irq].lock);
190 if (!irq_has_action(irq) ||
191 cpus_equal(irq_desc[irq].affinity, map)) {
192 spin_unlock(&irq_desc[irq].lock);
196 cpus_and(mask, irq_desc[irq].affinity, map);
197 if (cpus_empty(mask)) {
202 if (irq_desc[irq].chip->mask)
203 irq_desc[irq].chip->mask(irq);
205 if (irq_desc[irq].chip->set_affinity)
206 irq_desc[irq].chip->set_affinity(irq, mask);
207 else if (!(warned++))
210 if (irq_desc[irq].chip->unmask)
211 irq_desc[irq].chip->unmask(irq);
213 spin_unlock(&irq_desc[irq].lock);
215 if (break_affinity && set_affinity)
216 printk("Broke affinity for irq %i\n", irq);
217 else if (!set_affinity)
218 printk("Cannot set affinity for irq %i\n", irq);
221 /* That doesn't seem sufficient. Give it 1ms. */
228 extern void call_softirq(void);
230 asmlinkage void do_softirq(void)
238 local_irq_save(flags);
239 pending = local_softirq_pending();
240 /* Switch to interrupt stack */
243 WARN_ON_ONCE(softirq_count());
245 local_irq_restore(flags);