2 * Common interrupt code for 32 and 64 bit
5 #include <linux/interrupt.h>
6 #include <linux/kernel_stat.h>
7 #include <linux/seq_file.h>
9 #include <linux/ftrace.h>
12 #include <asm/io_apic.h>
16 atomic_t irq_err_count;
19 * 'what should we do if we get a hw irq event on an illegal vector'.
20 * each architecture has to answer this themselves.
22 void ack_bad_irq(unsigned int irq)
24 printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);
26 #ifdef CONFIG_X86_LOCAL_APIC
28 * Currently unexpected vectors happen only on SMP and APIC.
29 * We _must_ ack these because every local APIC has only N
30 * irq slots per priority level, and a 'hanging, unacked' IRQ
31 * holds up an irq slot - in excessive cases (when multiple
32 * unexpected vectors occur) that might lock up the APIC
34 * But only ack when the APIC is enabled -AK
41 #define irq_stats(x) (&per_cpu(irq_stat, x))
43 * /proc/interrupts printing:
45 static int show_other_interrupts(struct seq_file *p)
49 seq_printf(p, "NMI: ");
50 for_each_online_cpu(j)
51 seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
52 seq_printf(p, " Non-maskable interrupts\n");
53 #ifdef CONFIG_X86_LOCAL_APIC
54 seq_printf(p, "LOC: ");
55 for_each_online_cpu(j)
56 seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
57 seq_printf(p, " Local timer interrupts\n");
58 seq_printf(p, "CNT: ");
59 for_each_online_cpu(j)
60 seq_printf(p, "%10u ", irq_stats(j)->apic_perf_irqs);
61 seq_printf(p, " Performance counter interrupts\n");
64 seq_printf(p, "RES: ");
65 for_each_online_cpu(j)
66 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
67 seq_printf(p, " Rescheduling interrupts\n");
68 seq_printf(p, "CAL: ");
69 for_each_online_cpu(j)
70 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
71 seq_printf(p, " Function call interrupts\n");
72 seq_printf(p, "TLB: ");
73 for_each_online_cpu(j)
74 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
75 seq_printf(p, " TLB shootdowns\n");
78 seq_printf(p, "TRM: ");
79 for_each_online_cpu(j)
80 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
81 seq_printf(p, " Thermal event interrupts\n");
83 seq_printf(p, "THR: ");
84 for_each_online_cpu(j)
85 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
86 seq_printf(p, " Threshold APIC interrupts\n");
89 #ifdef CONFIG_X86_LOCAL_APIC
90 seq_printf(p, "SPU: ");
91 for_each_online_cpu(j)
92 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
93 seq_printf(p, " Spurious interrupts\n");
95 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
96 #if defined(CONFIG_X86_IO_APIC)
97 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
102 int show_interrupts(struct seq_file *p, void *v)
104 unsigned long flags, any_count = 0;
105 int i = *(loff_t *) v, j;
106 struct irqaction *action;
107 struct irq_desc *desc;
113 return show_other_interrupts(p);
118 for_each_online_cpu(j)
119 seq_printf(p, "CPU%-8d", j);
123 desc = irq_to_desc(i);
127 spin_lock_irqsave(&desc->lock, flags);
129 any_count = kstat_irqs(i);
131 for_each_online_cpu(j)
132 any_count |= kstat_irqs_cpu(i, j);
134 action = desc->action;
135 if (!action && !any_count)
138 seq_printf(p, "%3d: ", i);
140 seq_printf(p, "%10u ", kstat_irqs(i));
142 for_each_online_cpu(j)
143 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
145 seq_printf(p, " %8s", desc->chip->name);
146 seq_printf(p, "-%-8s", desc->name);
149 seq_printf(p, " %s", action->name);
150 while ((action = action->next) != NULL)
151 seq_printf(p, ", %s", action->name);
156 spin_unlock_irqrestore(&desc->lock, flags);
163 u64 arch_irq_stat_cpu(unsigned int cpu)
165 u64 sum = irq_stats(cpu)->__nmi_count;
167 #ifdef CONFIG_X86_LOCAL_APIC
168 sum += irq_stats(cpu)->apic_timer_irqs;
169 sum += irq_stats(cpu)->apic_perf_irqs;
172 sum += irq_stats(cpu)->irq_resched_count;
173 sum += irq_stats(cpu)->irq_call_count;
174 sum += irq_stats(cpu)->irq_tlb_count;
176 #ifdef CONFIG_X86_MCE
177 sum += irq_stats(cpu)->irq_thermal_count;
178 # ifdef CONFIG_X86_64
179 sum += irq_stats(cpu)->irq_threshold_count;
182 #ifdef CONFIG_X86_LOCAL_APIC
183 sum += irq_stats(cpu)->irq_spurious_count;
188 u64 arch_irq_stat(void)
190 u64 sum = atomic_read(&irq_err_count);
192 #ifdef CONFIG_X86_IO_APIC
193 sum += atomic_read(&irq_mis_count);
200 * do_IRQ handles all normal device IRQ's (the special
201 * SMP cross-CPU interrupts have their own specific
204 unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
206 struct pt_regs *old_regs = set_irq_regs(regs);
208 /* high bit used in ret_from_ code */
209 unsigned vector = ~regs->orig_ax;
215 irq = __get_cpu_var(vector_irq)[vector];
217 if (!handle_irq(irq, regs)) {
223 if (printk_ratelimit())
224 printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n",
225 __func__, smp_processor_id(), vector, irq);
230 set_irq_regs(old_regs);
234 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);