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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> |
16 | #include <linux/cpu.h> |
17 | #include <linux/hrtimer.h> |
18 | #include <asm/irq_regs.h> |
19 | #include <asm/ptrace.h> |
20 | |
21 | #include "oprof.h" |
22 | |
23 | static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer); |
24 | static int ctr_running; |
25 | |
26 | static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer) |
27 | { |
28 | oprofile_add_sample(get_irq_regs(), 0); |
29 | hrtimer_forward_now(hrtimer, ns_to_ktime(TICK_NSEC)); |
30 | return HRTIMER_RESTART; |
31 | } |
32 | |
33 | static void __oprofile_hrtimer_start(void *unused) |
34 | { |
35 | struct hrtimer *hrtimer = &__get_cpu_var(oprofile_hrtimer); |
36 | |
37 | if (!ctr_running) |
38 | return; |
39 | |
40 | hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
41 | hrtimer->function = oprofile_hrtimer_notify; |
42 | |
43 | hrtimer_start(hrtimer, ns_to_ktime(TICK_NSEC), |
44 | HRTIMER_MODE_REL_PINNED); |
45 | } |
46 | |
47 | static int oprofile_hrtimer_start(void) |
48 | { |
49 | get_online_cpus(); |
50 | ctr_running = 1; |
51 | on_each_cpu(__oprofile_hrtimer_start, NULL, 1); |
52 | put_online_cpus(); |
53 | return 0; |
54 | } |
55 | |
56 | static void __oprofile_hrtimer_stop(int cpu) |
57 | { |
58 | struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu); |
59 | |
60 | if (!ctr_running) |
61 | return; |
62 | |
63 | hrtimer_cancel(hrtimer); |
64 | } |
65 | |
66 | static void oprofile_hrtimer_stop(void) |
67 | { |
68 | int cpu; |
69 | |
70 | get_online_cpus(); |
71 | for_each_online_cpu(cpu) |
72 | __oprofile_hrtimer_stop(cpu); |
73 | ctr_running = 0; |
74 | put_online_cpus(); |
75 | } |
76 | |
77 | static int __cpuinit oprofile_cpu_notify(struct notifier_block *self, |
78 | unsigned long action, void *hcpu) |
79 | { |
80 | long cpu = (long) hcpu; |
81 | |
82 | switch (action) { |
83 | case CPU_ONLINE: |
84 | case CPU_ONLINE_FROZEN: |
85 | smp_call_function_single(cpu, __oprofile_hrtimer_start, |
86 | NULL, 1); |
87 | break; |
88 | case CPU_DEAD: |
89 | case CPU_DEAD_FROZEN: |
90 | __oprofile_hrtimer_stop(cpu); |
91 | break; |
92 | } |
93 | return NOTIFY_OK; |
94 | } |
95 | |
96 | static struct notifier_block __refdata oprofile_cpu_notifier = { |
97 | .notifier_call = oprofile_cpu_notify, |
98 | }; |
99 | |
100 | static int oprofile_hrtimer_setup(void) |
101 | { |
102 | return register_hotcpu_notifier(&oprofile_cpu_notifier); |
103 | } |
104 | |
105 | static void oprofile_hrtimer_shutdown(void) |
106 | { |
107 | unregister_hotcpu_notifier(&oprofile_cpu_notifier); |
108 | } |
109 | |
110 | int oprofile_timer_init(struct oprofile_operations *ops) |
111 | { |
112 | ops->create_files = NULL; |
113 | ops->setup = oprofile_hrtimer_setup; |
114 | ops->shutdown = oprofile_hrtimer_shutdown; |
115 | ops->start = oprofile_hrtimer_start; |
116 | ops->stop = oprofile_hrtimer_stop; |
117 | ops->cpu_type = "timer"; |
118 | printk(KERN_INFO "oprofile: using timer interrupt.\n"); |
119 | return 0; |
120 | } |
121 |
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