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1da177e4 LT |
1 | /** |
2 | * @file timer_int.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/notifier.h> | |
12 | #include <linux/smp.h> | |
13 | #include <linux/oprofile.h> | |
14 | #include <linux/profile.h> | |
15 | #include <linux/init.h> | |
bc078e4e MS |
16 | #include <linux/cpu.h> |
17 | #include <linux/hrtimer.h> | |
18 | #include <asm/irq_regs.h> | |
1da177e4 LT |
19 | #include <asm/ptrace.h> |
20 | ||
21 | #include "oprof.h" | |
22 | ||
bc078e4e MS |
23 | static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer); |
24 | ||
25 | static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer) | |
26 | { | |
27 | oprofile_add_sample(get_irq_regs(), 0); | |
28 | hrtimer_forward_now(hrtimer, ns_to_ktime(TICK_NSEC)); | |
29 | return HRTIMER_RESTART; | |
30 | } | |
31 | ||
32 | static void __oprofile_hrtimer_start(void *unused) | |
33 | { | |
34 | struct hrtimer *hrtimer = &__get_cpu_var(oprofile_hrtimer); | |
35 | ||
36 | hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
37 | hrtimer->function = oprofile_hrtimer_notify; | |
38 | ||
39 | hrtimer_start(hrtimer, ns_to_ktime(TICK_NSEC), | |
40 | HRTIMER_MODE_REL_PINNED); | |
41 | } | |
42 | ||
43 | static int oprofile_hrtimer_start(void) | |
1da177e4 | 44 | { |
bc078e4e | 45 | on_each_cpu(__oprofile_hrtimer_start, NULL, 1); |
1da177e4 LT |
46 | return 0; |
47 | } | |
48 | ||
bc078e4e | 49 | static void __oprofile_hrtimer_stop(int cpu) |
1da177e4 | 50 | { |
bc078e4e MS |
51 | struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu); |
52 | ||
53 | hrtimer_cancel(hrtimer); | |
1da177e4 LT |
54 | } |
55 | ||
bc078e4e MS |
56 | static void oprofile_hrtimer_stop(void) |
57 | { | |
58 | int cpu; | |
59 | ||
60 | for_each_online_cpu(cpu) | |
61 | __oprofile_hrtimer_stop(cpu); | |
62 | } | |
1da177e4 | 63 | |
bc078e4e MS |
64 | static int __cpuinit oprofile_cpu_notify(struct notifier_block *self, |
65 | unsigned long action, void *hcpu) | |
1da177e4 | 66 | { |
bc078e4e MS |
67 | long cpu = (long) hcpu; |
68 | ||
69 | switch (action) { | |
70 | case CPU_ONLINE: | |
71 | case CPU_ONLINE_FROZEN: | |
72 | smp_call_function_single(cpu, __oprofile_hrtimer_start, | |
73 | NULL, 1); | |
74 | break; | |
75 | case CPU_DEAD: | |
76 | case CPU_DEAD_FROZEN: | |
77 | __oprofile_hrtimer_stop(cpu); | |
78 | break; | |
79 | } | |
80 | return NOTIFY_OK; | |
1da177e4 LT |
81 | } |
82 | ||
bc078e4e MS |
83 | static struct notifier_block __refdata oprofile_cpu_notifier = { |
84 | .notifier_call = oprofile_cpu_notify, | |
85 | }; | |
1da177e4 | 86 | |
bc078e4e | 87 | int __init oprofile_timer_init(struct oprofile_operations *ops) |
1da177e4 | 88 | { |
bc078e4e MS |
89 | int rc; |
90 | ||
91 | rc = register_hotcpu_notifier(&oprofile_cpu_notifier); | |
92 | if (rc) | |
93 | return rc; | |
1da177e4 LT |
94 | ops->create_files = NULL; |
95 | ops->setup = NULL; | |
96 | ops->shutdown = NULL; | |
bc078e4e MS |
97 | ops->start = oprofile_hrtimer_start; |
98 | ops->stop = oprofile_hrtimer_stop; | |
1da177e4 | 99 | ops->cpu_type = "timer"; |
bc078e4e MS |
100 | return 0; |
101 | } | |
102 | ||
103 | void __exit oprofile_timer_exit(void) | |
104 | { | |
105 | unregister_hotcpu_notifier(&oprofile_cpu_notifier); | |
1da177e4 | 106 | } |