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>
11 #include <asm/genapic.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");
60 seq_printf(p
, "RES: ");
61 for_each_online_cpu(j
)
62 seq_printf(p
, "%10u ", irq_stats(j
)->irq_resched_count
);
63 seq_printf(p
, " Rescheduling interrupts\n");
64 seq_printf(p
, "CAL: ");
65 for_each_online_cpu(j
)
66 seq_printf(p
, "%10u ", irq_stats(j
)->irq_call_count
);
67 seq_printf(p
, " Function call interrupts\n");
68 seq_printf(p
, "TLB: ");
69 for_each_online_cpu(j
)
70 seq_printf(p
, "%10u ", irq_stats(j
)->irq_tlb_count
);
71 seq_printf(p
, " TLB shootdowns\n");
74 seq_printf(p
, "TRM: ");
75 for_each_online_cpu(j
)
76 seq_printf(p
, "%10u ", irq_stats(j
)->irq_thermal_count
);
77 seq_printf(p
, " Thermal event interrupts\n");
79 seq_printf(p
, "THR: ");
80 for_each_online_cpu(j
)
81 seq_printf(p
, "%10u ", irq_stats(j
)->irq_threshold_count
);
82 seq_printf(p
, " Threshold APIC interrupts\n");
85 #ifdef CONFIG_X86_LOCAL_APIC
86 seq_printf(p
, "SPU: ");
87 for_each_online_cpu(j
)
88 seq_printf(p
, "%10u ", irq_stats(j
)->irq_spurious_count
);
89 seq_printf(p
, " Spurious interrupts\n");
91 seq_printf(p
, "ERR: %10u\n", atomic_read(&irq_err_count
));
92 #if defined(CONFIG_X86_IO_APIC)
93 seq_printf(p
, "MIS: %10u\n", atomic_read(&irq_mis_count
));
98 int show_interrupts(struct seq_file
*p
, void *v
)
100 unsigned long flags
, any_count
= 0;
101 int i
= *(loff_t
*) v
, j
;
102 struct irqaction
*action
;
103 struct irq_desc
*desc
;
109 return show_other_interrupts(p
);
114 for_each_online_cpu(j
)
115 seq_printf(p
, "CPU%-8d", j
);
119 desc
= irq_to_desc(i
);
123 spin_lock_irqsave(&desc
->lock
, flags
);
125 any_count
= kstat_irqs(i
);
127 for_each_online_cpu(j
)
128 any_count
|= kstat_irqs_cpu(i
, j
);
130 action
= desc
->action
;
131 if (!action
&& !any_count
)
134 seq_printf(p
, "%3d: ", i
);
136 seq_printf(p
, "%10u ", kstat_irqs(i
));
138 for_each_online_cpu(j
)
139 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
141 seq_printf(p
, " %8s", desc
->chip
->name
);
142 seq_printf(p
, "-%-8s", desc
->name
);
145 seq_printf(p
, " %s", action
->name
);
146 while ((action
= action
->next
) != NULL
)
147 seq_printf(p
, ", %s", action
->name
);
152 spin_unlock_irqrestore(&desc
->lock
, flags
);
159 u64
arch_irq_stat_cpu(unsigned int cpu
)
161 u64 sum
= irq_stats(cpu
)->__nmi_count
;
163 #ifdef CONFIG_X86_LOCAL_APIC
164 sum
+= irq_stats(cpu
)->apic_timer_irqs
;
167 sum
+= irq_stats(cpu
)->irq_resched_count
;
168 sum
+= irq_stats(cpu
)->irq_call_count
;
169 sum
+= irq_stats(cpu
)->irq_tlb_count
;
171 #ifdef CONFIG_X86_MCE
172 sum
+= irq_stats(cpu
)->irq_thermal_count
;
173 # ifdef CONFIG_X86_64
174 sum
+= irq_stats(cpu
)->irq_threshold_count
;
177 #ifdef CONFIG_X86_LOCAL_APIC
178 sum
+= irq_stats(cpu
)->irq_spurious_count
;
183 u64
arch_irq_stat(void)
185 u64 sum
= atomic_read(&irq_err_count
);
187 #ifdef CONFIG_X86_IO_APIC
188 sum
+= atomic_read(&irq_mis_count
);
195 * do_IRQ handles all normal device IRQ's (the special
196 * SMP cross-CPU interrupts have their own specific
199 unsigned int __irq_entry
do_IRQ(struct pt_regs
*regs
)
201 struct pt_regs
*old_regs
= set_irq_regs(regs
);
203 /* high bit used in ret_from_ code */
204 unsigned vector
= ~regs
->orig_ax
;
210 irq
= __get_cpu_var(vector_irq
)[vector
];
212 if (!handle_irq(irq
, regs
)) {
218 if (printk_ratelimit())
219 printk(KERN_EMERG
"%s: %d.%d No irq handler for vector (irq %d)\n",
220 __func__
, smp_processor_id(), vector
, irq
);
225 set_irq_regs(old_regs
);
229 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq
);