Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar |
3 | * | |
4 | * This file contains the lowest level x86_64-specific interrupt | |
5 | * entry and irq statistics code. All the remaining irq logic is | |
6 | * done by the generic kernel/irq/ code and in the | |
7 | * x86_64-specific irq controller code. (e.g. i8259.c and | |
8 | * io_apic.c.) | |
9 | */ | |
10 | ||
11 | #include <linux/kernel_stat.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/seq_file.h> | |
14 | #include <linux/module.h> | |
76e4f660 | 15 | #include <linux/delay.h> |
1da177e4 LT |
16 | #include <asm/uaccess.h> |
17 | #include <asm/io_apic.h> | |
95833c83 | 18 | #include <asm/idle.h> |
2fb12a9b | 19 | #include <asm/smp.h> |
1da177e4 LT |
20 | |
21 | atomic_t irq_err_count; | |
1da177e4 | 22 | |
87ebecf1 TG |
23 | /* |
24 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
25 | * each architecture has to answer this themselves. | |
26 | */ | |
27 | void ack_bad_irq(unsigned int irq) | |
28 | { | |
29 | printk(KERN_WARNING "unexpected IRQ trap at vector %02x\n", irq); | |
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 don't ack when the APIC is disabled. -AK | |
38 | */ | |
39 | if (!disable_apic) | |
40 | ack_APIC_irq(); | |
41 | } | |
42 | ||
4961f10e ES |
43 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
44 | /* | |
45 | * Probabilistic stack overflow check: | |
46 | * | |
47 | * Only check the stack in process context, because everything else | |
48 | * runs on the big interrupt stacks. Checking reliably is too expensive, | |
49 | * so we just check from interrupts. | |
50 | */ | |
51 | static inline void stack_overflow_check(struct pt_regs *regs) | |
52 | { | |
c9f4f06d | 53 | u64 curbase = (u64)task_stack_page(current); |
4961f10e ES |
54 | static unsigned long warned = -60*HZ; |
55 | ||
65ea5b03 PA |
56 | if (regs->sp >= curbase && regs->sp <= curbase + THREAD_SIZE && |
57 | regs->sp < curbase + sizeof(struct thread_info) + 128 && | |
4961f10e | 58 | time_after(jiffies, warned + 60*HZ)) { |
65ea5b03 PA |
59 | printk("do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n", |
60 | current->comm, curbase, regs->sp); | |
4961f10e ES |
61 | show_stack(NULL,NULL); |
62 | warned = jiffies; | |
63 | } | |
64 | } | |
65 | #endif | |
66 | ||
1da177e4 LT |
67 | /* |
68 | * Generic, controller-independent functions: | |
69 | */ | |
70 | ||
71 | int show_interrupts(struct seq_file *p, void *v) | |
72 | { | |
73 | int i = *(loff_t *) v, j; | |
74 | struct irqaction * action; | |
75 | unsigned long flags; | |
76 | ||
77 | if (i == 0) { | |
78 | seq_printf(p, " "); | |
394e3902 | 79 | for_each_online_cpu(j) |
bdbdaa79 | 80 | seq_printf(p, "CPU%-8d",j); |
1da177e4 LT |
81 | seq_putc(p, '\n'); |
82 | } | |
83 | ||
0799e432 | 84 | if (i < nr_irqs) { |
072f5d82 | 85 | unsigned any_count = 0; |
08678b08 | 86 | struct irq_desc *desc = irq_to_desc(i); |
072f5d82 | 87 | |
08678b08 | 88 | spin_lock_irqsave(&desc->lock, flags); |
072f5d82 JB |
89 | #ifndef CONFIG_SMP |
90 | any_count = kstat_irqs(i); | |
91 | #else | |
92 | for_each_online_cpu(j) | |
7f95ec9e | 93 | any_count |= kstat_irqs_cpu(i, j); |
072f5d82 | 94 | #endif |
08678b08 | 95 | action = desc->action; |
072f5d82 | 96 | if (!action && !any_count) |
1da177e4 LT |
97 | goto skip; |
98 | seq_printf(p, "%3d: ",i); | |
99 | #ifndef CONFIG_SMP | |
100 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
101 | #else | |
394e3902 | 102 | for_each_online_cpu(j) |
7f95ec9e | 103 | seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); |
1da177e4 | 104 | #endif |
08678b08 YL |
105 | seq_printf(p, " %8s", desc->chip->name); |
106 | seq_printf(p, "-%-8s", desc->name); | |
1da177e4 | 107 | |
072f5d82 JB |
108 | if (action) { |
109 | seq_printf(p, " %s", action->name); | |
110 | while ((action = action->next) != NULL) | |
111 | seq_printf(p, ", %s", action->name); | |
112 | } | |
1da177e4 LT |
113 | seq_putc(p, '\n'); |
114 | skip: | |
08678b08 | 115 | spin_unlock_irqrestore(&desc->lock, flags); |
0799e432 | 116 | } else if (i == nr_irqs) { |
1da177e4 | 117 | seq_printf(p, "NMI: "); |
394e3902 AM |
118 | for_each_online_cpu(j) |
119 | seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count); | |
38e760a1 | 120 | seq_printf(p, " Non-maskable interrupts\n"); |
1da177e4 | 121 | seq_printf(p, "LOC: "); |
394e3902 AM |
122 | for_each_online_cpu(j) |
123 | seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs); | |
38e760a1 JK |
124 | seq_printf(p, " Local timer interrupts\n"); |
125 | #ifdef CONFIG_SMP | |
126 | seq_printf(p, "RES: "); | |
127 | for_each_online_cpu(j) | |
128 | seq_printf(p, "%10u ", cpu_pda(j)->irq_resched_count); | |
129 | seq_printf(p, " Rescheduling interrupts\n"); | |
130 | seq_printf(p, "CAL: "); | |
131 | for_each_online_cpu(j) | |
132 | seq_printf(p, "%10u ", cpu_pda(j)->irq_call_count); | |
dc44e659 | 133 | seq_printf(p, " Function call interrupts\n"); |
38e760a1 JK |
134 | seq_printf(p, "TLB: "); |
135 | for_each_online_cpu(j) | |
136 | seq_printf(p, "%10u ", cpu_pda(j)->irq_tlb_count); | |
137 | seq_printf(p, " TLB shootdowns\n"); | |
138 | #endif | |
a2eddfa9 | 139 | #ifdef CONFIG_X86_MCE |
38e760a1 JK |
140 | seq_printf(p, "TRM: "); |
141 | for_each_online_cpu(j) | |
142 | seq_printf(p, "%10u ", cpu_pda(j)->irq_thermal_count); | |
143 | seq_printf(p, " Thermal event interrupts\n"); | |
144 | seq_printf(p, "THR: "); | |
145 | for_each_online_cpu(j) | |
146 | seq_printf(p, "%10u ", cpu_pda(j)->irq_threshold_count); | |
147 | seq_printf(p, " Threshold APIC interrupts\n"); | |
a2eddfa9 | 148 | #endif |
38e760a1 JK |
149 | seq_printf(p, "SPU: "); |
150 | for_each_online_cpu(j) | |
151 | seq_printf(p, "%10u ", cpu_pda(j)->irq_spurious_count); | |
152 | seq_printf(p, " Spurious interrupts\n"); | |
1da177e4 | 153 | seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count)); |
1da177e4 LT |
154 | } |
155 | return 0; | |
156 | } | |
157 | ||
a2eddfa9 JB |
158 | /* |
159 | * /proc/stat helpers | |
160 | */ | |
161 | u64 arch_irq_stat_cpu(unsigned int cpu) | |
162 | { | |
163 | u64 sum = cpu_pda(cpu)->__nmi_count; | |
164 | ||
165 | sum += cpu_pda(cpu)->apic_timer_irqs; | |
166 | #ifdef CONFIG_SMP | |
167 | sum += cpu_pda(cpu)->irq_resched_count; | |
168 | sum += cpu_pda(cpu)->irq_call_count; | |
169 | sum += cpu_pda(cpu)->irq_tlb_count; | |
170 | #endif | |
171 | #ifdef CONFIG_X86_MCE | |
172 | sum += cpu_pda(cpu)->irq_thermal_count; | |
173 | sum += cpu_pda(cpu)->irq_threshold_count; | |
174 | #endif | |
175 | sum += cpu_pda(cpu)->irq_spurious_count; | |
176 | return sum; | |
177 | } | |
178 | ||
179 | u64 arch_irq_stat(void) | |
180 | { | |
181 | return atomic_read(&irq_err_count); | |
182 | } | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * do_IRQ handles all normal device IRQ's (the special | |
186 | * SMP cross-CPU interrupts have their own specific | |
187 | * handlers). | |
188 | */ | |
189 | asmlinkage unsigned int do_IRQ(struct pt_regs *regs) | |
7d12e780 DH |
190 | { |
191 | struct pt_regs *old_regs = set_irq_regs(regs); | |
192 | ||
19eadf98 | 193 | /* high bit used in ret_from_ code */ |
65ea5b03 | 194 | unsigned vector = ~regs->orig_ax; |
e500f574 EB |
195 | unsigned irq; |
196 | ||
197 | exit_idle(); | |
198 | irq_enter(); | |
550f2299 | 199 | irq = __get_cpu_var(vector_irq)[vector]; |
1da177e4 | 200 | |
4961f10e ES |
201 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
202 | stack_overflow_check(regs); | |
203 | #endif | |
d3696cf7 | 204 | |
7d94f7ca | 205 | if (likely(__irq_to_desc(irq))) |
d3696cf7 | 206 | generic_handle_irq(irq); |
2fb12a9b EB |
207 | else { |
208 | if (!disable_apic) | |
209 | ack_APIC_irq(); | |
210 | ||
211 | if (printk_ratelimit()) | |
212 | printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n", | |
213 | __func__, smp_processor_id(), vector); | |
214 | } | |
d3696cf7 | 215 | |
1da177e4 LT |
216 | irq_exit(); |
217 | ||
7d12e780 | 218 | set_irq_regs(old_regs); |
1da177e4 LT |
219 | return 1; |
220 | } | |
221 | ||
76e4f660 AR |
222 | #ifdef CONFIG_HOTPLUG_CPU |
223 | void fixup_irqs(cpumask_t map) | |
224 | { | |
225 | unsigned int irq; | |
226 | static int warned; | |
2c6927a3 | 227 | struct irq_desc *desc; |
76e4f660 | 228 | |
2c6927a3 | 229 | for_each_irq_desc(irq, desc) { |
76e4f660 | 230 | cpumask_t mask; |
48d8d7ee SS |
231 | int break_affinity = 0; |
232 | int set_affinity = 1; | |
233 | ||
76e4f660 AR |
234 | if (irq == 2) |
235 | continue; | |
236 | ||
48d8d7ee | 237 | /* interrupt's are disabled at this point */ |
08678b08 | 238 | spin_lock(&desc->lock); |
48d8d7ee SS |
239 | |
240 | if (!irq_has_action(irq) || | |
08678b08 YL |
241 | cpus_equal(desc->affinity, map)) { |
242 | spin_unlock(&desc->lock); | |
48d8d7ee SS |
243 | continue; |
244 | } | |
245 | ||
08678b08 | 246 | cpus_and(mask, desc->affinity, map); |
48d8d7ee SS |
247 | if (cpus_empty(mask)) { |
248 | break_affinity = 1; | |
76e4f660 AR |
249 | mask = map; |
250 | } | |
48d8d7ee | 251 | |
08678b08 YL |
252 | if (desc->chip->mask) |
253 | desc->chip->mask(irq); | |
48d8d7ee | 254 | |
08678b08 YL |
255 | if (desc->chip->set_affinity) |
256 | desc->chip->set_affinity(irq, mask); | |
48d8d7ee SS |
257 | else if (!(warned++)) |
258 | set_affinity = 0; | |
259 | ||
08678b08 YL |
260 | if (desc->chip->unmask) |
261 | desc->chip->unmask(irq); | |
48d8d7ee | 262 | |
08678b08 | 263 | spin_unlock(&desc->lock); |
48d8d7ee SS |
264 | |
265 | if (break_affinity && set_affinity) | |
266 | printk("Broke affinity for irq %i\n", irq); | |
267 | else if (!set_affinity) | |
76e4f660 AR |
268 | printk("Cannot set affinity for irq %i\n", irq); |
269 | } | |
270 | ||
271 | /* That doesn't seem sufficient. Give it 1ms. */ | |
272 | local_irq_enable(); | |
273 | mdelay(1); | |
274 | local_irq_disable(); | |
275 | } | |
276 | #endif | |
ed6b676c AK |
277 | |
278 | extern void call_softirq(void); | |
279 | ||
280 | asmlinkage void do_softirq(void) | |
281 | { | |
282 | __u32 pending; | |
283 | unsigned long flags; | |
284 | ||
285 | if (in_interrupt()) | |
286 | return; | |
287 | ||
288 | local_irq_save(flags); | |
289 | pending = local_softirq_pending(); | |
290 | /* Switch to interrupt stack */ | |
2601e64d | 291 | if (pending) { |
ed6b676c | 292 | call_softirq(); |
2601e64d IM |
293 | WARN_ON_ONCE(softirq_count()); |
294 | } | |
ed6b676c AK |
295 | local_irq_restore(flags); |
296 | } |