Commit | Line | Data |
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9550e59c MH |
1 | /** |
2 | * @file init.c | |
3 | * | |
4 | * @remark Copyright 2002 OProfile authors | |
5 | * @remark Read the file COPYING | |
6 | * | |
7 | * @author John Levon <levon@movementarian.org> | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/oprofile.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/init.h> | |
c4a57435 | 14 | #include <linux/param.h> /* for HZ */ |
9550e59c | 15 | |
422e23ea | 16 | #ifdef CONFIG_SPARC64 |
e5553a6d DM |
17 | #include <linux/notifier.h> |
18 | #include <linux/rcupdate.h> | |
19 | #include <linux/kdebug.h> | |
20 | #include <asm/nmi.h> | |
422e23ea | 21 | |
e5553a6d DM |
22 | static int profile_timer_exceptions_notify(struct notifier_block *self, |
23 | unsigned long val, void *data) | |
422e23ea | 24 | { |
4e85f591 | 25 | struct die_args *args = data; |
e5553a6d | 26 | int ret = NOTIFY_DONE; |
422e23ea | 27 | |
e5553a6d DM |
28 | switch (val) { |
29 | case DIE_NMI: | |
30 | oprofile_add_sample(args->regs, 0); | |
31 | ret = NOTIFY_STOP; | |
32 | break; | |
33 | default: | |
34 | break; | |
422e23ea | 35 | } |
e5553a6d | 36 | return ret; |
422e23ea DM |
37 | } |
38 | ||
e5553a6d DM |
39 | static struct notifier_block profile_timer_exceptions_nb = { |
40 | .notifier_call = profile_timer_exceptions_notify, | |
41 | }; | |
422e23ea | 42 | |
e5553a6d | 43 | static int timer_start(void) |
422e23ea | 44 | { |
e5553a6d DM |
45 | if (register_die_notifier(&profile_timer_exceptions_nb)) |
46 | return 1; | |
47 | nmi_adjust_hz(HZ); | |
48 | return 0; | |
422e23ea DM |
49 | } |
50 | ||
422e23ea | 51 | |
e5553a6d | 52 | static void timer_stop(void) |
422e23ea | 53 | { |
e5553a6d DM |
54 | nmi_adjust_hz(1); |
55 | unregister_die_notifier(&profile_timer_exceptions_nb); | |
56 | synchronize_sched(); /* Allow already-started NMIs to complete. */ | |
422e23ea DM |
57 | } |
58 | ||
e5553a6d | 59 | static int op_nmi_timer_init(struct oprofile_operations *ops) |
422e23ea | 60 | { |
a8f22264 | 61 | if (atomic_read(&nmi_active) <= 0) |
422e23ea DM |
62 | return -ENODEV; |
63 | ||
e5553a6d DM |
64 | ops->start = timer_start; |
65 | ops->stop = timer_stop; | |
422e23ea | 66 | ops->cpu_type = "timer"; |
e5553a6d | 67 | printk(KERN_INFO "oprofile: Using perfctr NMI timer interrupt.\n"); |
422e23ea DM |
68 | return 0; |
69 | } | |
70 | #endif | |
71 | ||
25ad2913 | 72 | int __init oprofile_arch_init(struct oprofile_operations *ops) |
9550e59c | 73 | { |
422e23ea DM |
74 | int ret = -ENODEV; |
75 | ||
76 | #ifdef CONFIG_SPARC64 | |
e5553a6d | 77 | ret = op_nmi_timer_init(ops); |
422e23ea DM |
78 | if (!ret) |
79 | return ret; | |
80 | #endif | |
81 | ||
82 | return ret; | |
9550e59c MH |
83 | } |
84 | ||
9550e59c MH |
85 | void oprofile_arch_exit(void) |
86 | { | |
87 | } |