Quelle  opid.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <linux/ftrace.h>
#include <linux/tracepoint.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/rv.h>
#include <rv/instrumentation.h>
#include <rv/da_monitor.h>

#define MODULE_NAME "opid"

#include <trace/events/sched.h>
#include <trace/events/irq.h>
#include <trace/events/preemptirq.h>
#include <rv_trace.h>
#include <monitors/sched/sched.h>

#include "opid.h"

static struct rv_monitor rv_opid;
DECLARE_DA_MON_PER_CPU(opid, unsigned char);

#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/trace/irq_vectors.h>

static void handle_vector_irq_entry(void *data, int vector)
{
 da_handle_event_opid(irq_entry_opid);
}

static void attach_vector_irq(void)
{
 rv_attach_trace_probe("opid", local_timer_entry, handle_vector_irq_entry);
 if (IS_ENABLED(CONFIG_IRQ_WORK))
  rv_attach_trace_probe("opid", irq_work_entry, handle_vector_irq_entry);
 if (IS_ENABLED(CONFIG_SMP)) {
  rv_attach_trace_probe("opid", reschedule_entry, handle_vector_irq_entry);
  rv_attach_trace_probe("opid", call_function_entry, handle_vector_irq_entry);
  rv_attach_trace_probe("opid", call_function_single_entry, handle_vector_irq_entry);
 }
}

static void detach_vector_irq(void)
{
 rv_detach_trace_probe("opid", local_timer_entry, handle_vector_irq_entry);
 if (IS_ENABLED(CONFIG_IRQ_WORK))
  rv_detach_trace_probe("opid", irq_work_entry, handle_vector_irq_entry);
 if (IS_ENABLED(CONFIG_SMP)) {
  rv_detach_trace_probe("opid", reschedule_entry, handle_vector_irq_entry);
  rv_detach_trace_probe("opid", call_function_entry, handle_vector_irq_entry);
  rv_detach_trace_probe("opid", call_function_single_entry, handle_vector_irq_entry);
 }
}

#else
/* We assume irq_entry tracepoints are sufficient on other architectures */
static void attach_vector_irq(void) { }
static void detach_vector_irq(void) { }
#endif

static void handle_irq_disable(void *data, unsigned long ip, unsigned long parent_ip)
{
 da_handle_event_opid(irq_disable_opid);
}

static void handle_irq_enable(void *data, unsigned long ip, unsigned long parent_ip)
{
 da_handle_event_opid(irq_enable_opid);
}

static void handle_irq_entry(void *data, int irq, struct irqaction *action)
{
 da_handle_event_opid(irq_entry_opid);
}

static void handle_preempt_disable(void *data, unsigned long ip, unsigned long parent_ip)
{
 da_handle_event_opid(preempt_disable_opid);
}

static void handle_preempt_enable(void *data, unsigned long ip, unsigned long parent_ip)
{
 da_handle_event_opid(preempt_enable_opid);
}

static void handle_sched_need_resched(void *data, struct task_struct *tsk, int cpu, int tif)
{
 /* The monitor's intitial state is not in_irq */
 if (this_cpu_read(hardirq_context))
  da_handle_event_opid(sched_need_resched_opid);
 else
  da_handle_start_event_opid(sched_need_resched_opid);
}

static void handle_sched_waking(void *data, struct task_struct *p)
{
 /* The monitor's intitial state is not in_irq */
 if (this_cpu_read(hardirq_context))
  da_handle_event_opid(sched_waking_opid);
 else
  da_handle_start_event_opid(sched_waking_opid);
}

static int enable_opid(void)
{
 int retval;

 retval = da_monitor_init_opid();
 if (retval)
  return retval;

 rv_attach_trace_probe("opid", irq_disable, handle_irq_disable);
 rv_attach_trace_probe("opid", irq_enable, handle_irq_enable);
 rv_attach_trace_probe("opid", irq_handler_entry, handle_irq_entry);
 rv_attach_trace_probe("opid", preempt_disable, handle_preempt_disable);
 rv_attach_trace_probe("opid", preempt_enable, handle_preempt_enable);
 rv_attach_trace_probe("opid", sched_set_need_resched_tp, handle_sched_need_resched);
 rv_attach_trace_probe("opid", sched_waking, handle_sched_waking);
 attach_vector_irq();

 return 0;
}

static void disable_opid(void)
{
 rv_opid.enabled = 0;

 rv_detach_trace_probe("opid", irq_disable, handle_irq_disable);
 rv_detach_trace_probe("opid", irq_enable, handle_irq_enable);
 rv_detach_trace_probe("opid", irq_handler_entry, handle_irq_entry);
 rv_detach_trace_probe("opid", preempt_disable, handle_preempt_disable);
 rv_detach_trace_probe("opid", preempt_enable, handle_preempt_enable);
 rv_detach_trace_probe("opid", sched_set_need_resched_tp, handle_sched_need_resched);
 rv_detach_trace_probe("opid", sched_waking, handle_sched_waking);
 detach_vector_irq();

 da_monitor_destroy_opid();
}

/*
 * This is the monitor register section.
 */
static struct rv_monitor rv_opid = {
 .name = "opid",
 .description = "operations with preemption and irq disabled.",
 .enable = enable_opid,
 .disable = disable_opid,
 .reset = da_monitor_reset_all_opid,
 .enabled = 0,
};

static int __init register_opid(void)
{
 return rv_register_monitor(&rv_opid, &rv_sched);
}

static void __exit unregister_opid(void)
{
 rv_unregister_monitor(&rv_opid);
}

module_init(register_opid);
module_exit(unregister_opid);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gabriele Monaco ");
MODULE_DESCRIPTION("opid: operations with preemption and irq disabled.");