2 * Copyright (C) ARM Limited 2011-2014. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
10 void (*callback)(void);
11 DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer);
12 DEFINE_PER_CPU(ktime_t, hrtimer_expire);
13 DEFINE_PER_CPU(int, hrtimer_is_active);
14 static ktime_t profiling_interval;
15 static void gator_hrtimer_online(void);
16 static void gator_hrtimer_offline(void);
18 static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer)
20 int cpu = get_logical_cpu();
22 hrtimer_forward(hrtimer, per_cpu(hrtimer_expire, cpu), profiling_interval);
23 per_cpu(hrtimer_expire, cpu) = ktime_add(per_cpu(hrtimer_expire, cpu), profiling_interval);
25 return HRTIMER_RESTART;
28 static void gator_hrtimer_online(void)
30 int cpu = get_logical_cpu();
31 struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
33 if (per_cpu(hrtimer_is_active, cpu) || profiling_interval.tv64 == 0)
36 per_cpu(hrtimer_is_active, cpu) = 1;
37 hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
38 hrtimer->function = gator_hrtimer_notify;
39 #ifdef CONFIG_PREEMPT_RT_BASE
42 per_cpu(hrtimer_expire, cpu) = ktime_add(hrtimer->base->get_time(), profiling_interval);
43 hrtimer_start(hrtimer, per_cpu(hrtimer_expire, cpu), HRTIMER_MODE_ABS_PINNED);
46 static void gator_hrtimer_offline(void)
48 int cpu = get_logical_cpu();
49 struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
51 if (!per_cpu(hrtimer_is_active, cpu))
54 per_cpu(hrtimer_is_active, cpu) = 0;
55 hrtimer_cancel(hrtimer);
58 static int gator_hrtimer_init(int interval, void (*func)(void))
64 for_each_present_cpu(cpu) {
65 per_cpu(hrtimer_is_active, cpu) = 0;
68 /* calculate profiling interval */
70 profiling_interval = ns_to_ktime(1000000000UL / interval);
72 profiling_interval.tv64 = 0;
77 static void gator_hrtimer_shutdown(void)