2 * Copyright (C) ARM Limited 2011-2013. 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 // gator_hrtimer_perf.c is used if perf is supported
11 // update, gator_hrtimer_gator.c always used until issues resolved with perf hrtimers
14 void (*callback)(void);
15 DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer);
16 DEFINE_PER_CPU(ktime_t, hrtimer_expire);
17 DEFINE_PER_CPU(int, hrtimer_is_active);
18 static ktime_t profiling_interval;
19 static void gator_hrtimer_online(void);
20 static void gator_hrtimer_offline(void);
22 static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer)
24 int cpu = get_logical_cpu();
25 hrtimer_forward(hrtimer, per_cpu(hrtimer_expire, cpu), profiling_interval);
26 per_cpu(hrtimer_expire, cpu) = ktime_add(per_cpu(hrtimer_expire, cpu), profiling_interval);
28 return HRTIMER_RESTART;
31 static void gator_hrtimer_online(void)
33 int cpu = get_logical_cpu();
34 struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
36 if (per_cpu(hrtimer_is_active, cpu) || profiling_interval.tv64 == 0)
39 per_cpu(hrtimer_is_active, cpu) = 1;
40 hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
41 hrtimer->function = gator_hrtimer_notify;
42 #ifdef CONFIG_PREEMPT_RT_BASE
45 per_cpu(hrtimer_expire, cpu) = ktime_add(hrtimer->base->get_time(), profiling_interval);
46 hrtimer_start(hrtimer, per_cpu(hrtimer_expire, cpu), HRTIMER_MODE_ABS_PINNED);
49 static void gator_hrtimer_offline(void)
51 int cpu = get_logical_cpu();
52 struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu);
54 if (!per_cpu(hrtimer_is_active, cpu))
57 per_cpu(hrtimer_is_active, cpu) = 0;
58 hrtimer_cancel(hrtimer);
61 static int gator_hrtimer_init(int interval, void (*func)(void))
67 for_each_present_cpu(cpu) {
68 per_cpu(hrtimer_is_active, cpu) = 0;
71 // calculate profiling interval
73 profiling_interval = ns_to_ktime(1000000000UL / interval);
75 profiling_interval.tv64 = 0;
81 static void gator_hrtimer_shutdown(void)