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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>
#define MODULE_NAME "opid"
#include <trace/events/sched.h>
#include <rv_trace.h>
#include <monitors/sched/sched.h>
#define RV_MON_TYPE RV_MON_PER_CPU
#include "opid.h"
#include <rv/ha_monitor.h>
static u64 ha_get_env(struct ha_monitor *ha_mon, enum envs_opid env, u64 time_ns)
{
if (env == irq_off_opid)
return irqs_disabled();
else if (env == preempt_off_opid) {
/*
* If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables
* preemption (adding one to the preempt_count). Since we are
* interested in the preempt_count at the time the tracepoint was
* hit, we consider 1 as still enabled.
*/
if (IS_ENABLED(CONFIG_PREEMPTION))
return (preempt_count() & PREEMPT_MASK) > 1;
return true;
}
return ENV_INVALID_VALUE;
}
static inline bool ha_verify_guards(struct ha_monitor *ha_mon,
enum states curr_state, enum events event,
enum states next_state, u64 time_ns)
{
bool res = true;
if (curr_state == any_opid && event == sched_need_resched_opid)
res = ha_get_env(ha_mon, irq_off_opid, time_ns) == 1ull;
else if (curr_state == any_opid && event == sched_waking_opid)
res = ha_get_env(ha_mon, irq_off_opid, time_ns) == 1ull &&
ha_get_env(ha_mon, preempt_off_opid, time_ns) == 1ull;
return res;
}
static bool ha_verify_constraint(struct ha_monitor *ha_mon,
enum states curr_state, enum events event,
enum states next_state, u64 time_ns)
{
if (!ha_verify_guards(ha_mon, curr_state, event, next_state, time_ns))
return false;
return true;
}
static void handle_sched_need_resched(void *data, struct task_struct *tsk, int cpu, int tif)
{
da_handle_start_run_event(sched_need_resched_opid);
}
static void handle_sched_waking(void *data, struct task_struct *p)
{
da_handle_start_run_event(sched_waking_opid);
}
static int enable_opid(void)
{
int retval;
retval = da_monitor_init();
if (retval)
return retval;
rv_attach_trace_probe("opid", sched_set_need_resched_tp, handle_sched_need_resched);
rv_attach_trace_probe("opid", sched_waking, handle_sched_waking);
return 0;
}
static void disable_opid(void)
{
rv_this.enabled = 0;
rv_detach_trace_probe("opid", sched_set_need_resched_tp, handle_sched_need_resched);
rv_detach_trace_probe("opid", sched_waking, handle_sched_waking);
da_monitor_destroy();
}
/*
* This is the monitor register section.
*/
static struct rv_monitor rv_this = {
.name = "opid",
.description = "operations with preemption and irq disabled.",
.enable = enable_opid,
.disable = disable_opid,
.reset = da_monitor_reset_all,
.enabled = 0,
};
static int __init register_opid(void)
{
return rv_register_monitor(&rv_this, &rv_sched);
}
static void __exit unregister_opid(void)
{
rv_unregister_monitor(&rv_this);
}
module_init(register_opid);
module_exit(unregister_opid);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
MODULE_DESCRIPTION("opid: operations with preemption and irq disabled.");
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