Commit | Line | Data |
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6b39ba77 TG |
1 | /* |
2 | * Common interrupt code for 32 and 64 bit | |
3 | */ | |
4 | #include <linux/cpu.h> | |
5 | #include <linux/interrupt.h> | |
6 | #include <linux/kernel_stat.h> | |
7 | #include <linux/seq_file.h> | |
6a02e710 | 8 | #include <linux/smp.h> |
7c1d7cdc | 9 | #include <linux/ftrace.h> |
6b39ba77 | 10 | |
7b6aa335 | 11 | #include <asm/apic.h> |
6b39ba77 | 12 | #include <asm/io_apic.h> |
c3d80000 | 13 | #include <asm/irq.h> |
7c1d7cdc | 14 | #include <asm/idle.h> |
6b39ba77 TG |
15 | |
16 | atomic_t irq_err_count; | |
17 | ||
acaabe79 DS |
18 | /* Function pointer for generic interrupt vector handling */ |
19 | void (*generic_interrupt_extension)(void) = NULL; | |
20 | ||
249f6d9e TG |
21 | /* |
22 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
23 | * each architecture has to answer this themselves. | |
24 | */ | |
25 | void ack_bad_irq(unsigned int irq) | |
26 | { | |
27 | printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq); | |
28 | ||
29 | #ifdef CONFIG_X86_LOCAL_APIC | |
30 | /* | |
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 | |
36 | * completely. | |
37 | * But only ack when the APIC is enabled -AK | |
38 | */ | |
39 | if (cpu_has_apic) | |
40 | ack_APIC_irq(); | |
41 | #endif | |
42 | } | |
43 | ||
1b437c8c | 44 | #define irq_stats(x) (&per_cpu(irq_stat, x)) |
6b39ba77 TG |
45 | /* |
46 | * /proc/interrupts printing: | |
47 | */ | |
7a81d9a7 | 48 | static int show_other_interrupts(struct seq_file *p, int prec) |
6b39ba77 TG |
49 | { |
50 | int j; | |
51 | ||
7a81d9a7 | 52 | seq_printf(p, "%*s: ", prec, "NMI"); |
6b39ba77 TG |
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 | |
7a81d9a7 | 57 | seq_printf(p, "%*s: ", prec, "LOC"); |
6b39ba77 TG |
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"); | |
61 | #endif | |
acaabe79 DS |
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"); | |
67 | } | |
6b39ba77 | 68 | #ifdef CONFIG_SMP |
7a81d9a7 | 69 | seq_printf(p, "%*s: ", prec, "RES"); |
6b39ba77 TG |
70 | for_each_online_cpu(j) |
71 | seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count); | |
72 | seq_printf(p, " Rescheduling interrupts\n"); | |
7a81d9a7 | 73 | seq_printf(p, "%*s: ", prec, "CAL"); |
6b39ba77 TG |
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"); | |
7a81d9a7 | 77 | seq_printf(p, "%*s: ", prec, "TLB"); |
6b39ba77 TG |
78 | for_each_online_cpu(j) |
79 | seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count); | |
80 | seq_printf(p, " TLB shootdowns\n"); | |
81 | #endif | |
82 | #ifdef CONFIG_X86_MCE | |
7a81d9a7 | 83 | seq_printf(p, "%*s: ", prec, "TRM"); |
6b39ba77 TG |
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"); | |
87 | # ifdef CONFIG_X86_64 | |
7a81d9a7 | 88 | seq_printf(p, "%*s: ", prec, "THR"); |
6b39ba77 TG |
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"); | |
92 | # endif | |
93 | #endif | |
94 | #ifdef CONFIG_X86_LOCAL_APIC | |
7a81d9a7 | 95 | seq_printf(p, "%*s: ", prec, "SPU"); |
6b39ba77 TG |
96 | for_each_online_cpu(j) |
97 | seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count); | |
98 | seq_printf(p, " Spurious interrupts\n"); | |
99 | #endif | |
7a81d9a7 | 100 | seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); |
6b39ba77 | 101 | #if defined(CONFIG_X86_IO_APIC) |
7a81d9a7 | 102 | seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count)); |
6b39ba77 TG |
103 | #endif |
104 | return 0; | |
105 | } | |
106 | ||
107 | int show_interrupts(struct seq_file *p, void *v) | |
108 | { | |
109 | unsigned long flags, any_count = 0; | |
7a81d9a7 | 110 | int i = *(loff_t *) v, j, prec; |
6b39ba77 TG |
111 | struct irqaction *action; |
112 | struct irq_desc *desc; | |
113 | ||
114 | if (i > nr_irqs) | |
115 | return 0; | |
116 | ||
7a81d9a7 JB |
117 | for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) |
118 | j *= 10; | |
119 | ||
6b39ba77 | 120 | if (i == nr_irqs) |
7a81d9a7 | 121 | return show_other_interrupts(p, prec); |
6b39ba77 TG |
122 | |
123 | /* print header */ | |
124 | if (i == 0) { | |
7a81d9a7 | 125 | seq_printf(p, "%*s", prec + 8, ""); |
6b39ba77 | 126 | for_each_online_cpu(j) |
e9f95e63 | 127 | seq_printf(p, "CPU%-8d", j); |
6b39ba77 TG |
128 | seq_putc(p, '\n'); |
129 | } | |
130 | ||
131 | desc = irq_to_desc(i); | |
0b8f1efa YL |
132 | if (!desc) |
133 | return 0; | |
134 | ||
6b39ba77 | 135 | spin_lock_irqsave(&desc->lock, flags); |
6b39ba77 TG |
136 | for_each_online_cpu(j) |
137 | any_count |= kstat_irqs_cpu(i, j); | |
6b39ba77 TG |
138 | action = desc->action; |
139 | if (!action && !any_count) | |
140 | goto out; | |
141 | ||
7a81d9a7 | 142 | seq_printf(p, "%*d: ", prec, i); |
6b39ba77 TG |
143 | for_each_online_cpu(j) |
144 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); | |
6b39ba77 TG |
145 | seq_printf(p, " %8s", desc->chip->name); |
146 | seq_printf(p, "-%-8s", desc->name); | |
147 | ||
148 | if (action) { | |
149 | seq_printf(p, " %s", action->name); | |
150 | while ((action = action->next) != NULL) | |
151 | seq_printf(p, ", %s", action->name); | |
152 | } | |
153 | ||
154 | seq_putc(p, '\n'); | |
155 | out: | |
156 | spin_unlock_irqrestore(&desc->lock, flags); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /* | |
161 | * /proc/stat helpers | |
162 | */ | |
163 | u64 arch_irq_stat_cpu(unsigned int cpu) | |
164 | { | |
165 | u64 sum = irq_stats(cpu)->__nmi_count; | |
166 | ||
167 | #ifdef CONFIG_X86_LOCAL_APIC | |
168 | sum += irq_stats(cpu)->apic_timer_irqs; | |
169 | #endif | |
acaabe79 DS |
170 | if (generic_interrupt_extension) |
171 | sum += irq_stats(cpu)->generic_irqs; | |
6b39ba77 TG |
172 | #ifdef CONFIG_SMP |
173 | sum += irq_stats(cpu)->irq_resched_count; | |
174 | sum += irq_stats(cpu)->irq_call_count; | |
175 | sum += irq_stats(cpu)->irq_tlb_count; | |
176 | #endif | |
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; | |
181 | #endif | |
182 | #endif | |
183 | #ifdef CONFIG_X86_LOCAL_APIC | |
184 | sum += irq_stats(cpu)->irq_spurious_count; | |
185 | #endif | |
186 | return sum; | |
187 | } | |
188 | ||
189 | u64 arch_irq_stat(void) | |
190 | { | |
191 | u64 sum = atomic_read(&irq_err_count); | |
192 | ||
193 | #ifdef CONFIG_X86_IO_APIC | |
194 | sum += atomic_read(&irq_mis_count); | |
195 | #endif | |
196 | return sum; | |
197 | } | |
c3d80000 | 198 | |
7c1d7cdc JF |
199 | |
200 | /* | |
201 | * do_IRQ handles all normal device IRQ's (the special | |
202 | * SMP cross-CPU interrupts have their own specific | |
203 | * handlers). | |
204 | */ | |
205 | unsigned int __irq_entry do_IRQ(struct pt_regs *regs) | |
206 | { | |
207 | struct pt_regs *old_regs = set_irq_regs(regs); | |
208 | ||
209 | /* high bit used in ret_from_ code */ | |
210 | unsigned vector = ~regs->orig_ax; | |
211 | unsigned irq; | |
212 | ||
213 | exit_idle(); | |
214 | irq_enter(); | |
215 | ||
216 | irq = __get_cpu_var(vector_irq)[vector]; | |
217 | ||
218 | if (!handle_irq(irq, regs)) { | |
219 | #ifdef CONFIG_X86_64 | |
220 | if (!disable_apic) | |
221 | ack_APIC_irq(); | |
222 | #endif | |
223 | ||
224 | if (printk_ratelimit()) | |
225 | printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n", | |
226 | __func__, smp_processor_id(), vector, irq); | |
227 | } | |
228 | ||
229 | irq_exit(); | |
230 | ||
231 | set_irq_regs(old_regs); | |
232 | return 1; | |
233 | } | |
234 | ||
acaabe79 DS |
235 | /* |
236 | * Handler for GENERIC_INTERRUPT_VECTOR. | |
237 | */ | |
238 | void smp_generic_interrupt(struct pt_regs *regs) | |
239 | { | |
240 | struct pt_regs *old_regs = set_irq_regs(regs); | |
241 | ||
242 | ack_APIC_irq(); | |
243 | ||
244 | exit_idle(); | |
245 | ||
246 | irq_enter(); | |
247 | ||
248 | inc_irq_stat(generic_irqs); | |
249 | ||
250 | if (generic_interrupt_extension) | |
251 | generic_interrupt_extension(); | |
252 | ||
253 | irq_exit(); | |
254 | ||
255 | set_irq_regs(old_regs); | |
256 | } | |
257 | ||
c3d80000 | 258 | EXPORT_SYMBOL_GPL(vector_used_by_percpu_irq); |