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)
52 seq_printf(p, "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, "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 if (generic_interrupt_extension) {
63 seq_printf(p, "PLT: ");
64 for_each_online_cpu(j)
65 seq_printf(p, "%10u ", irq_stats(j)->generic_irqs);
66 seq_printf(p, " Platform interrupts\n");
69 seq_printf(p, "RES: ");
70 for_each_online_cpu(j)
71 seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
72 seq_printf(p, " Rescheduling interrupts\n");
73 seq_printf(p, "CAL: ");
74 for_each_online_cpu(j)
75 seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
76 seq_printf(p, " Function call interrupts\n");
77 seq_printf(p, "TLB: ");
78 for_each_online_cpu(j)
79 seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
80 seq_printf(p, " TLB shootdowns\n");
83 seq_printf(p, "TRM: ");
84 for_each_online_cpu(j)
85 seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
86 seq_printf(p, " Thermal event interrupts\n");
88 seq_printf(p, "THR: ");
89 for_each_online_cpu(j)
90 seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
91 seq_printf(p, " Threshold APIC interrupts\n");
94 #ifdef CONFIG_X86_LOCAL_APIC
95 seq_printf(p, "SPU: ");
96 for_each_online_cpu(j)
97 seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
98 seq_printf(p, " Spurious interrupts\n");
100 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
101 #if defined(CONFIG_X86_IO_APIC)
102 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
107 int show_interrupts(struct seq_file *p, void *v)
109 unsigned long flags, any_count = 0;
110 int i = *(loff_t *) v, j;
111 struct irqaction *action;
112 struct irq_desc *desc;
118 return show_other_interrupts(p);
123 for_each_online_cpu(j)
124 seq_printf(p, "CPU%-8d", j);
128 desc = irq_to_desc(i);
132 spin_lock_irqsave(&desc->lock, flags);
134 any_count = kstat_irqs(i);
136 for_each_online_cpu(j)
137 any_count |= kstat_irqs_cpu(i, j);
139 action = desc->action;
140 if (!action && !any_count)
143 seq_printf(p, "%3d: ", i);
145 seq_printf(p, "%10u ", kstat_irqs(i));
147 for_each_online_cpu(j)
148 seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
150 seq_printf(p, " %8s", desc->chip->name);
151 seq_printf(p, "-%-8s", desc->name);
154 seq_printf(p, " %s", action->name);
155 while ((action = action->next) != NULL)
156 seq_printf(p, ", %s", action->name);
161 spin_unlock_irqrestore(&desc->lock, flags);
168 u64 arch_irq_stat_cpu(unsigned int cpu)
170 u64 sum = irq_stats(cpu)->__nmi_count;
172 #ifdef CONFIG_X86_LOCAL_APIC
173 sum += irq_stats(cpu)->apic_timer_irqs;
175 if (generic_interrupt_extension)
176 sum += irq_stats(cpu)->generic_irqs;
178 sum += irq_stats(cpu)->irq_resched_count;
179 sum += irq_stats(cpu)->irq_call_count;
180 sum += irq_stats(cpu)->irq_tlb_count;
182 #ifdef CONFIG_X86_MCE
183 sum += irq_stats(cpu)->irq_thermal_count;
184 # ifdef CONFIG_X86_64
185 sum += irq_stats(cpu)->irq_threshold_count;
188 #ifdef CONFIG_X86_LOCAL_APIC
189 sum += irq_stats(cpu)->irq_spurious_count;
194 u64 arch_irq_stat(void)
196 u64 sum = atomic_read(&irq_err_count);
198 #ifdef CONFIG_X86_IO_APIC
199 sum += atomic_read(&irq_mis_count);
206 * do_IRQ handles all normal device IRQ's (the special
207 * SMP cross-CPU interrupts have their own specific
210 unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
212 struct pt_regs *old_regs = set_irq_regs(regs);
214 /* high bit used in ret_from_ code */
215 unsigned vector = ~regs->orig_ax;
221 irq = __get_cpu_var(vector_irq)[vector];
223 if (!handle_irq(irq, regs)) {
229 if (printk_ratelimit())
230 printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n",
231 __func__, smp_processor_id(), vector, irq);
236 set_irq_regs(old_regs);
241 * Handler for GENERIC_INTERRUPT_VECTOR.
243 void smp_generic_interrupt(struct pt_regs *regs)
245 struct pt_regs *old_regs = set_irq_regs(regs);
253 inc_irq_stat(generic_irqs);
255 if (generic_interrupt_extension)
256 generic_interrupt_extension();
260 set_irq_regs(old_regs);
263 EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq);