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// 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 "tss"
#include <trace/events/sched.h>
#include <rv_trace.h>
#include <monitors/sched/sched.h>
#include "tss.h"
static struct rv_monitor rv_tss;
DECLARE_DA_MON_PER_CPU(tss, unsigned char);
static void handle_sched_switch(void *data, bool preempt,
struct task_struct *prev,
struct task_struct *next,
unsigned int prev_state)
{
da_handle_event_tss(sched_switch_tss);
}
static void handle_schedule_entry(void *data, bool preempt, unsigned long ip)
{
da_handle_event_tss(schedule_entry_tss);
}
static void handle_schedule_exit(void *data, bool is_switch, unsigned long ip)
{
da_handle_start_event_tss(schedule_exit_tss);
}
static int enable_tss(void)
{
int retval;
retval = da_monitor_init_tss();
if (retval)
return retval;
rv_attach_trace_probe("tss", sched_switch, handle_sched_switch);
rv_attach_trace_probe("tss", sched_entry_tp, handle_schedule_entry);
rv_attach_trace_probe("tss", sched_exit_tp, handle_schedule_exit);
return 0;
}
static void disable_tss(void)
{
rv_tss.enabled = 0;
rv_detach_trace_probe("tss", sched_switch, handle_sched_switch);
rv_detach_trace_probe("tss", sched_entry_tp, handle_schedule_entry);
rv_detach_trace_probe("tss", sched_exit_tp, handle_schedule_exit);
da_monitor_destroy_tss();
}
static struct rv_monitor rv_tss = {
.name = "tss",
.description = "task switch while scheduling.",
.enable = enable_tss,
.disable = disable_tss,
.reset = da_monitor_reset_all_tss,
.enabled = 0,
};
static int __init register_tss(void)
{
rv_register_monitor(&rv_tss, &rv_sched);
return 0;
}
static void __exit unregister_tss(void)
{
rv_unregister_monitor(&rv_tss);
}
module_init(register_tss);
module_exit(unregister_tss);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
MODULE_DESCRIPTION("tss: task switch while scheduling.");
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