diff options
Diffstat (limited to 'drivers/gator/gator_hrtimer_gator.c')
-rwxr-xr-x | drivers/gator/gator_hrtimer_gator.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/gator/gator_hrtimer_gator.c b/drivers/gator/gator_hrtimer_gator.c new file mode 100755 index 00000000000..846fba44cff --- /dev/null +++ b/drivers/gator/gator_hrtimer_gator.c @@ -0,0 +1,97 @@ +/** + * Copyright (C) ARM Limited 2011-2012. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +// gator_hrtimer_perf.c is used if perf is supported +// update, gator_hrtimer_gator.c always used until issues resolved with perf hrtimers +#if 1 + +void (*callback)(void); +DEFINE_PER_CPU(struct hrtimer, percpu_hrtimer); +DEFINE_PER_CPU(int, hrtimer_is_active); +static ktime_t profiling_interval; +static void gator_hrtimer_online(int cpu); +static void gator_hrtimer_offline(int cpu); + +static enum hrtimer_restart gator_hrtimer_notify(struct hrtimer *hrtimer) +{ + hrtimer_forward_now(hrtimer, profiling_interval); + (*callback)(); + return HRTIMER_RESTART; +} + +static void gator_hrtimer_switch_cpus_online(void *unused) +{ + gator_hrtimer_online(smp_processor_id()); +} + +static void gator_hrtimer_online(int cpu) +{ + struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu); + + if (cpu != smp_processor_id()) { + smp_call_function_single(cpu, gator_hrtimer_switch_cpus_online, NULL, 1); + return; + } + + if (per_cpu(hrtimer_is_active, cpu) || profiling_interval.tv64 == 0) + return; + + per_cpu(hrtimer_is_active, cpu) = 1; + hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer->function = gator_hrtimer_notify; + hrtimer_start(hrtimer, profiling_interval, HRTIMER_MODE_REL_PINNED); +} + +static void gator_hrtimer_switch_cpus_offline(void *unused) +{ + gator_hrtimer_offline(smp_processor_id()); +} + +static void gator_hrtimer_offline(int cpu) +{ + struct hrtimer *hrtimer = &per_cpu(percpu_hrtimer, cpu); + + if (cpu != smp_processor_id()) { + smp_call_function_single(cpu, gator_hrtimer_switch_cpus_offline, NULL, 1); + return; + } + + if (!per_cpu(hrtimer_is_active, cpu)) + return; + + per_cpu(hrtimer_is_active, cpu) = 0; + hrtimer_cancel(hrtimer); +} + +static int gator_hrtimer_init(int interval, void (*func)(void)) +{ + int cpu; + + (callback) = (func); + + for_each_present_cpu(cpu) { + per_cpu(hrtimer_is_active, cpu) = 0; + } + + // calculate profiling interval + if (interval > 0) { + profiling_interval = ns_to_ktime(1000000000UL / interval); + } else { + profiling_interval.tv64 = 0; + } + + return 0; +} + +static void gator_hrtimer_shutdown(void) +{ + /* empty */ +} + +#endif |