// 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>

#define MODULE_NAME "wwnr"

#include <rv_trace.h>
#include <trace/events/sched.h>

#define RV_MON_TYPE RV_MON_PER_TASK
#include "wwnr.h"
#include <rv/da_monitor.h>

static void handle_switch(void *data, bool preempt, struct task_struct *p,
                          struct task_struct *n, unsigned int prev_state)
{
        /* start monitoring only after the first suspension */
        if (prev_state == TASK_INTERRUPTIBLE)
                da_handle_start_event(p, switch_out_wwnr);
        else
                da_handle_event(p, switch_out_wwnr);

        da_handle_event(n, switch_in_wwnr);
}

static void handle_wakeup(void *data, struct task_struct *p)
{
        da_handle_event(p, wakeup_wwnr);
}

static int enable_wwnr(void)
{
        int retval;

        retval = da_monitor_init();
        if (retval)
                return retval;

        rv_attach_trace_probe("wwnr", sched_switch, handle_switch);
        rv_attach_trace_probe("wwnr", sched_wakeup, handle_wakeup);

        return 0;
}

static void disable_wwnr(void)
{
        rv_this.enabled = 0;

        rv_detach_trace_probe("wwnr", sched_switch, handle_switch);
        rv_detach_trace_probe("wwnr", sched_wakeup, handle_wakeup);

        da_monitor_destroy();
}

static struct rv_monitor rv_this = {
        .name = "wwnr",
        .description = "wakeup while not running per-task testing model.",
        .enable = enable_wwnr,
        .disable = disable_wwnr,
        .reset = da_monitor_reset_all,
        .enabled = 0,
};

static int __init register_wwnr(void)
{
        return rv_register_monitor(&rv_this, NULL);
}

static void __exit unregister_wwnr(void)
{
        rv_unregister_monitor(&rv_this);
}

module_init(register_wwnr);
module_exit(unregister_wwnr);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Bristot de Oliveira <bristot@kernel.org>");
MODULE_DESCRIPTION("wwnr: wakeup while not running monitor");