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122 lines
2.5 KiB
122 lines
2.5 KiB
/** |
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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 <[email protected]> |
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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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