123 lines
2.5 KiB
C
123 lines
2.5 KiB
C
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/**
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* @file timer_int.c
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon <levon@movementarian.org>
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*/
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#include <linux/kernel.h>
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#include <linux/notifier.h>
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#include <linux/smp.h>
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#include <linux/oprofile.h>
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#include <linux/profile.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/hrtimer.h>
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#include <asm/irq_regs.h>
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#include <asm/ptrace.h>
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#include "oprof.h"
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static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer);
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static int ctr_running;
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static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer)
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{
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oprofile_add_sample(get_irq_regs(), 0);
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hrtimer_forward_now(hrtimer, ns_to_ktime(TICK_NSEC));
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return HRTIMER_RESTART;
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}
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static void __oprofile_hrtimer_start(void *unused)
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{
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struct hrtimer *hrtimer = this_cpu_ptr(&oprofile_hrtimer);
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if (!ctr_running)
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return;
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hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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hrtimer->function = oprofile_hrtimer_notify;
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hrtimer_start(hrtimer, ns_to_ktime(TICK_NSEC),
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HRTIMER_MODE_REL_PINNED);
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}
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static int oprofile_hrtimer_start(void)
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{
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get_online_cpus();
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ctr_running = 1;
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on_each_cpu(__oprofile_hrtimer_start, NULL, 1);
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put_online_cpus();
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return 0;
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}
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static void __oprofile_hrtimer_stop(int cpu)
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{
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struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu);
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if (!ctr_running)
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return;
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hrtimer_cancel(hrtimer);
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}
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static void oprofile_hrtimer_stop(void)
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{
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int cpu;
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get_online_cpus();
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for_each_online_cpu(cpu)
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__oprofile_hrtimer_stop(cpu);
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ctr_running = 0;
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put_online_cpus();
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}
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static int oprofile_timer_online(unsigned int cpu)
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{
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local_irq_disable();
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__oprofile_hrtimer_start(NULL);
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local_irq_enable();
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return 0;
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}
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static int oprofile_timer_prep_down(unsigned int cpu)
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{
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__oprofile_hrtimer_stop(cpu);
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return 0;
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}
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static enum cpuhp_state hp_online;
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static int oprofile_hrtimer_setup(void)
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{
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int ret;
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ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
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"oprofile/timer:online",
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oprofile_timer_online,
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oprofile_timer_prep_down);
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if (ret < 0)
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return ret;
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hp_online = ret;
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return 0;
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}
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static void oprofile_hrtimer_shutdown(void)
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{
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cpuhp_remove_state_nocalls(hp_online);
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}
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int oprofile_timer_init(struct oprofile_operations *ops)
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{
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ops->create_files = NULL;
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ops->setup = oprofile_hrtimer_setup;
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ops->shutdown = oprofile_hrtimer_shutdown;
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ops->start = oprofile_hrtimer_start;
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ops->stop = oprofile_hrtimer_stop;
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ops->cpu_type = "timer";
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printk(KERN_INFO "oprofile: using timer interrupt.\n");
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return 0;
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}
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