]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /** |
2 | * @file nmi_timer_int.c | |
3 | * | |
4 | * @remark Copyright 2003 OProfile authors | |
5 | * @remark Read the file COPYING | |
6 | * | |
7 | * @author Zwane Mwaikambo <zwane@linuxpower.ca> | |
8 | */ | |
9 | ||
10 | #include <linux/init.h> | |
11 | #include <linux/smp.h> | |
ce3a161e | 12 | #include <linux/errno.h> |
1da177e4 LT |
13 | #include <linux/oprofile.h> |
14 | #include <linux/rcupdate.h> | |
1eeb66a1 | 15 | #include <linux/kdebug.h> |
1da177e4 LT |
16 | |
17 | #include <asm/nmi.h> | |
18 | #include <asm/apic.h> | |
19 | #include <asm/ptrace.h> | |
0fb90297 | 20 | |
c7c19f8e AB |
21 | static int profile_timer_exceptions_notify(struct notifier_block *self, |
22 | unsigned long val, void *data) | |
1da177e4 | 23 | { |
2fbe7b25 DZ |
24 | struct die_args *args = (struct die_args *)data; |
25 | int ret = NOTIFY_DONE; | |
26 | ||
0fb90297 | 27 | switch (val) { |
2fbe7b25 DZ |
28 | case DIE_NMI: |
29 | oprofile_add_sample(args->regs, 0); | |
30 | ret = NOTIFY_STOP; | |
31 | break; | |
32 | default: | |
33 | break; | |
34 | } | |
35 | return ret; | |
1da177e4 LT |
36 | } |
37 | ||
2fbe7b25 DZ |
38 | static struct notifier_block profile_timer_exceptions_nb = { |
39 | .notifier_call = profile_timer_exceptions_notify, | |
40 | .next = NULL, | |
41 | .priority = 0 | |
42 | }; | |
43 | ||
1da177e4 LT |
44 | static int timer_start(void) |
45 | { | |
2fbe7b25 DZ |
46 | if (register_die_notifier(&profile_timer_exceptions_nb)) |
47 | return 1; | |
1da177e4 LT |
48 | return 0; |
49 | } | |
50 | ||
51 | ||
52 | static void timer_stop(void) | |
53 | { | |
2fbe7b25 | 54 | unregister_die_notifier(&profile_timer_exceptions_nb); |
fbd568a3 | 55 | synchronize_sched(); /* Allow already-started NMIs to complete. */ |
1da177e4 LT |
56 | } |
57 | ||
58 | ||
0fb90297 | 59 | int __init op_nmi_timer_init(struct oprofile_operations *ops) |
1da177e4 | 60 | { |
2fbe7b25 | 61 | if ((nmi_watchdog != NMI_IO_APIC) || (atomic_read(&nmi_active) <= 0)) |
1da177e4 LT |
62 | return -ENODEV; |
63 | ||
64 | ops->start = timer_start; | |
65 | ops->stop = timer_stop; | |
66 | ops->cpu_type = "timer"; | |
67 | printk(KERN_INFO "oprofile: using NMI timer interrupt.\n"); | |
68 | return 0; | |
69 | } |