Commit | Line | Data |
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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> |
bcbc4f20 | 16 | #include <linux/ftrace.h> |
5f66b2a0 JSR |
17 | #include <linux/uaccess.h> |
18 | #include <linux/smp.h> | |
1da177e4 | 19 | #include <asm/io_apic.h> |
95833c83 | 20 | #include <asm/idle.h> |
3819cd48 | 21 | #include <asm/apic.h> |
1da177e4 | 22 | |
1b437c8c BG |
23 | DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); |
24 | EXPORT_PER_CPU_SYMBOL(irq_stat); | |
25 | ||
d650a514 BG |
26 | DEFINE_PER_CPU(struct pt_regs *, irq_regs); |
27 | EXPORT_PER_CPU_SYMBOL(irq_regs); | |
28 | ||
4961f10e ES |
29 | /* |
30 | * Probabilistic stack overflow check: | |
31 | * | |
32 | * Only check the stack in process context, because everything else | |
33 | * runs on the big interrupt stacks. Checking reliably is too expensive, | |
34 | * so we just check from interrupts. | |
35 | */ | |
36 | static inline void stack_overflow_check(struct pt_regs *regs) | |
37 | { | |
f377fa12 | 38 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
c9f4f06d | 39 | u64 curbase = (u64)task_stack_page(current); |
f377fa12 | 40 | |
69682b62 MH |
41 | if (user_mode_vm(regs)) |
42 | return; | |
43 | ||
f377fa12 IM |
44 | WARN_ONCE(regs->sp >= curbase && |
45 | regs->sp <= curbase + THREAD_SIZE && | |
46 | regs->sp < curbase + sizeof(struct thread_info) + | |
47 | sizeof(struct pt_regs) + 128, | |
48 | ||
49 | "do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n", | |
50 | current->comm, curbase, regs->sp); | |
4961f10e | 51 | #endif |
f377fa12 | 52 | } |
4961f10e | 53 | |
9b2b76a3 JF |
54 | bool handle_irq(unsigned irq, struct pt_regs *regs) |
55 | { | |
56 | struct irq_desc *desc; | |
57 | ||
58 | stack_overflow_check(regs); | |
59 | ||
60 | desc = irq_to_desc(irq); | |
61 | if (unlikely(!desc)) | |
62 | return false; | |
63 | ||
64 | generic_handle_irq_desc(irq, desc); | |
65 | return true; | |
66 | } | |
67 | ||
ed6b676c AK |
68 | |
69 | extern void call_softirq(void); | |
70 | ||
71 | asmlinkage void do_softirq(void) | |
72 | { | |
5f66b2a0 JSR |
73 | __u32 pending; |
74 | unsigned long flags; | |
ed6b676c | 75 | |
5f66b2a0 JSR |
76 | if (in_interrupt()) |
77 | return; | |
ed6b676c | 78 | |
5f66b2a0 JSR |
79 | local_irq_save(flags); |
80 | pending = local_softirq_pending(); | |
81 | /* Switch to interrupt stack */ | |
82 | if (pending) { | |
ed6b676c | 83 | call_softirq(); |
2601e64d IM |
84 | WARN_ON_ONCE(softirq_count()); |
85 | } | |
5f66b2a0 | 86 | local_irq_restore(flags); |
ed6b676c | 87 | } |