Root/
1 | /* |
2 | * arch/s390/kernel/irq.c |
3 | * |
4 | * Copyright IBM Corp. 2004,2007 |
5 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
6 | * Thomas Spatzier (tspat@de.ibm.com) |
7 | * |
8 | * This file contains interrupt related functions. |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/kernel_stat.h> |
14 | #include <linux/interrupt.h> |
15 | #include <linux/seq_file.h> |
16 | #include <linux/cpu.h> |
17 | #include <linux/proc_fs.h> |
18 | #include <linux/profile.h> |
19 | |
20 | /* |
21 | * show_interrupts is needed by /proc/interrupts. |
22 | */ |
23 | int show_interrupts(struct seq_file *p, void *v) |
24 | { |
25 | static const char *intrclass_names[] = { "EXT", "I/O", }; |
26 | int i = *(loff_t *) v, j; |
27 | |
28 | get_online_cpus(); |
29 | if (i == 0) { |
30 | seq_puts(p, " "); |
31 | for_each_online_cpu(j) |
32 | seq_printf(p, "CPU%d ",j); |
33 | seq_putc(p, '\n'); |
34 | } |
35 | |
36 | if (i < NR_IRQS) { |
37 | seq_printf(p, "%s: ", intrclass_names[i]); |
38 | #ifndef CONFIG_SMP |
39 | seq_printf(p, "%10u ", kstat_irqs(i)); |
40 | #else |
41 | for_each_online_cpu(j) |
42 | seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]); |
43 | #endif |
44 | seq_putc(p, '\n'); |
45 | |
46 | } |
47 | put_online_cpus(); |
48 | return 0; |
49 | } |
50 | |
51 | /* |
52 | * For compatibilty only. S/390 specific setup of interrupts et al. is done |
53 | * much later in init_channel_subsystem(). |
54 | */ |
55 | void __init |
56 | init_IRQ(void) |
57 | { |
58 | /* nothing... */ |
59 | } |
60 | |
61 | /* |
62 | * Switch to the asynchronous interrupt stack for softirq execution. |
63 | */ |
64 | asmlinkage void do_softirq(void) |
65 | { |
66 | unsigned long flags, old, new; |
67 | |
68 | if (in_interrupt()) |
69 | return; |
70 | |
71 | local_irq_save(flags); |
72 | |
73 | if (local_softirq_pending()) { |
74 | /* Get current stack pointer. */ |
75 | asm volatile("la %0,0(15)" : "=a" (old)); |
76 | /* Check against async. stack address range. */ |
77 | new = S390_lowcore.async_stack; |
78 | if (((new - old) >> (PAGE_SHIFT + THREAD_ORDER)) != 0) { |
79 | /* Need to switch to the async. stack. */ |
80 | new -= STACK_FRAME_OVERHEAD; |
81 | ((struct stack_frame *) new)->back_chain = old; |
82 | |
83 | asm volatile(" la 15,0(%0)\n" |
84 | " basr 14,%2\n" |
85 | " la 15,0(%1)\n" |
86 | : : "a" (new), "a" (old), |
87 | "a" (__do_softirq) |
88 | : "0", "1", "2", "3", "4", "5", "14", |
89 | "cc", "memory" ); |
90 | } else |
91 | /* We are already on the async stack. */ |
92 | __do_softirq(); |
93 | } |
94 | |
95 | local_irq_restore(flags); |
96 | } |
97 | |
98 | #ifdef CONFIG_PROC_FS |
99 | void init_irq_proc(void) |
100 | { |
101 | struct proc_dir_entry *root_irq_dir; |
102 | |
103 | root_irq_dir = proc_mkdir("irq", NULL); |
104 | create_prof_cpu_mask(root_irq_dir); |
105 | } |
106 | #endif |
107 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9