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
;
18 /* Function pointer for generic interrupt vector handling */
19 void (*generic_interrupt_extension
)(void) = NULL
;
22 * 'what should we do if we get a hw irq event on an illegal vector'.
23 * each architecture has to answer this themselves.
25 void ack_bad_irq(unsigned int irq
)
27 printk(KERN_ERR
"unexpected IRQ trap at vector %02x\n", irq
);
29 #ifdef CONFIG_X86_LOCAL_APIC
31 * Currently unexpected vectors happen only on SMP and APIC.
32 * We _must_ ack these because every local APIC has only N
33 * irq slots per priority level, and a 'hanging, unacked' IRQ
34 * holds up an irq slot - in excessive cases (when multiple
35 * unexpected vectors occur) that might lock up the APIC
37 * But only ack when the APIC is enabled -AK
44 #define irq_stats(x) (&per_cpu(irq_stat, x))
46 * /proc/interrupts printing:
48 static int show_other_interrupts(struct seq_file
*p
, int prec
)
52 seq_printf(p
, "%*s: ", prec
, "NMI");
53 for_each_online_cpu(j
)
54 seq_printf(p
, "%10u ", irq_stats(j
)->__nmi_count
);
55 seq_printf(p
, " Non-maskable interrupts\n");
56 #ifdef CONFIG_X86_LOCAL_APIC
57 seq_printf(p
, "%*s: ", prec
, "LOC");
58 for_each_online_cpu(j
)
59 seq_printf(p
, "%10u ", irq_stats(j
)->apic_timer_irqs
);
60 seq_printf(p
, " Local timer interrupts\n");
62 seq_printf(p
, "%*s: ", prec
, "SPU");
63 for_each_online_cpu(j
)
64 seq_printf(p
, "%10u ", irq_stats(j
)->irq_spurious_count
);
65 seq_printf(p
, " Spurious interrupts\n");
67 if (generic_interrupt_extension
) {
68 seq_printf(p
, "%*s: ", prec
, "PLT");
69 for_each_online_cpu(j
)
70 seq_printf(p
, "%10u ", irq_stats(j
)->generic_irqs
);
71 seq_printf(p
, " Platform interrupts\n");
74 seq_printf(p
, "%*s: ", prec
, "RES");
75 for_each_online_cpu(j
)
76 seq_printf(p
, "%10u ", irq_stats(j
)->irq_resched_count
);
77 seq_printf(p
, " Rescheduling interrupts\n");
78 seq_printf(p
, "%*s: ", prec
, "CAL");
79 for_each_online_cpu(j
)
80 seq_printf(p
, "%10u ", irq_stats(j
)->irq_call_count
);
81 seq_printf(p
, " Function call interrupts\n");
82 seq_printf(p
, "%*s: ", prec
, "TLB");
83 for_each_online_cpu(j
)
84 seq_printf(p
, "%10u ", irq_stats(j
)->irq_tlb_count
);
85 seq_printf(p
, " TLB shootdowns\n");
88 seq_printf(p
, "%*s: ", prec
, "TRM");
89 for_each_online_cpu(j
)
90 seq_printf(p
, "%10u ", irq_stats(j
)->irq_thermal_count
);
91 seq_printf(p
, " Thermal event interrupts\n");
93 seq_printf(p
, "%*s: ", prec
, "THR");
94 for_each_online_cpu(j
)
95 seq_printf(p
, "%10u ", irq_stats(j
)->irq_threshold_count
);
96 seq_printf(p
, " Threshold APIC interrupts\n");
99 seq_printf(p
, "%*s: %10u\n", prec
, "ERR", atomic_read(&irq_err_count
));
100 #if defined(CONFIG_X86_IO_APIC)
101 seq_printf(p
, "%*s: %10u\n", prec
, "MIS", atomic_read(&irq_mis_count
));
106 int show_interrupts(struct seq_file
*p
, void *v
)
108 unsigned long flags
, any_count
= 0;
109 int i
= *(loff_t
*) v
, j
, prec
;
110 struct irqaction
*action
;
111 struct irq_desc
*desc
;
116 for (prec
= 3, j
= 1000; prec
< 10 && j
<= nr_irqs
; ++prec
)
120 return show_other_interrupts(p
, prec
);
124 seq_printf(p
, "%*s", prec
+ 8, "");
125 for_each_online_cpu(j
)
126 seq_printf(p
, "CPU%-8d", j
);
130 desc
= irq_to_desc(i
);
134 spin_lock_irqsave(&desc
->lock
, flags
);
135 for_each_online_cpu(j
)
136 any_count
|= kstat_irqs_cpu(i
, j
);
137 action
= desc
->action
;
138 if (!action
&& !any_count
)
141 seq_printf(p
, "%*d: ", prec
, i
);
142 for_each_online_cpu(j
)
143 seq_printf(p
, "%10u ", kstat_irqs_cpu(i
, j
));
144 seq_printf(p
, " %8s", desc
->chip
->name
);
145 seq_printf(p
, "-%-8s", desc
->name
);
148 seq_printf(p
, " %s", action
->name
);
149 while ((action
= action
->next
) != NULL
)
150 seq_printf(p
, ", %s", action
->name
);
155 spin_unlock_irqrestore(&desc
->lock
, flags
);
162 u64
arch_irq_stat_cpu(unsigned int cpu
)
164 u64 sum
= irq_stats(cpu
)->__nmi_count
;
166 #ifdef CONFIG_X86_LOCAL_APIC
167 sum
+= irq_stats(cpu
)->apic_timer_irqs
;
168 sum
+= irq_stats(cpu
)->irq_spurious_count
;
170 if (generic_interrupt_extension
)
171 sum
+= irq_stats(cpu
)->generic_irqs
;
173 sum
+= irq_stats(cpu
)->irq_resched_count
;
174 sum
+= irq_stats(cpu
)->irq_call_count
;
175 sum
+= irq_stats(cpu
)->irq_tlb_count
;
177 #ifdef CONFIG_X86_MCE
178 sum
+= irq_stats(cpu
)->irq_thermal_count
;
179 # ifdef CONFIG_X86_64
180 sum
+= irq_stats(cpu
)->irq_threshold_count
;
186 u64
arch_irq_stat(void)
188 u64 sum
= atomic_read(&irq_err_count
);
190 #ifdef CONFIG_X86_IO_APIC
191 sum
+= atomic_read(&irq_mis_count
);
198 * do_IRQ handles all normal device IRQ's (the special
199 * SMP cross-CPU interrupts have their own specific
202 unsigned int __irq_entry
do_IRQ(struct pt_regs
*regs
)
204 struct pt_regs
*old_regs
= set_irq_regs(regs
);
206 /* high bit used in ret_from_ code */
207 unsigned vector
= ~regs
->orig_ax
;
213 irq
= __get_cpu_var(vector_irq
)[vector
];
215 if (!handle_irq(irq
, regs
)) {
221 if (printk_ratelimit())
222 printk(KERN_EMERG
"%s: %d.%d No irq handler for vector (irq %d)\n",
223 __func__
, smp_processor_id(), vector
, irq
);
228 set_irq_regs(old_regs
);
233 * Handler for GENERIC_INTERRUPT_VECTOR.
235 void smp_generic_interrupt(struct pt_regs
*regs
)
237 struct pt_regs
*old_regs
= set_irq_regs(regs
);
245 inc_irq_stat(generic_irqs
);
247 if (generic_interrupt_extension
)
248 generic_interrupt_extension();
252 set_irq_regs(old_regs
);
255 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq
);