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/* SPDX-License-Identifier: GPL-2.0 */
/**
* This file must be combined with the $(MODEL_NAME).h file generated by
* tools/verification/rvgen.
*/
#include <linux/args.h>
#include <linux/rv.h>
#include <linux/stringify.h>
#include <linux/seq_buf.h>
#include <rv/instrumentation.h>
#include <trace/events/task.h>
#include <trace/events/sched.h>
#ifndef MONITOR_NAME
#error "Please include $(MODEL_NAME).h generated by rvgen"
#endif
#ifdef CONFIG_RV_REACTORS
#define RV_MONITOR_NAME CONCATENATE(rv_, MONITOR_NAME)
static struct rv_monitor RV_MONITOR_NAME;
static void rv_cond_react(struct task_struct *task)
{
if (!rv_reacting_on() || !RV_MONITOR_NAME.react)
return;
RV_MONITOR_NAME.react("rv: "__stringify(MONITOR_NAME)": %s[%d]: violation detected\n",
task->comm, task->pid);
}
#else
static void rv_cond_react(struct task_struct *task)
{
}
#endif
static int ltl_monitor_slot = RV_PER_TASK_MONITOR_INIT;
static void ltl_atoms_fetch(struct task_struct *task, struct ltl_monitor *mon);
static void ltl_atoms_init(struct task_struct *task, struct ltl_monitor *mon, bool task_creation);
static struct ltl_monitor *ltl_get_monitor(struct task_struct *task)
{
return &task->rv[ltl_monitor_slot].ltl_mon;
}
static void ltl_task_init(struct task_struct *task, bool task_creation)
{
struct ltl_monitor *mon = ltl_get_monitor(task);
memset(&mon->states, 0, sizeof(mon->states));
for (int i = 0; i < LTL_NUM_ATOM; ++i)
__set_bit(i, mon->unknown_atoms);
ltl_atoms_init(task, mon, task_creation);
ltl_atoms_fetch(task, mon);
}
static void handle_task_newtask(void *data, struct task_struct *task, unsigned long flags)
{
ltl_task_init(task, true);
}
static int ltl_monitor_init(void)
{
struct task_struct *g, *p;
int ret, cpu;
ret = rv_get_task_monitor_slot();
if (ret < 0)
return ret;
ltl_monitor_slot = ret;
rv_attach_trace_probe(name, task_newtask, handle_task_newtask);
read_lock(&tasklist_lock);
for_each_process_thread(g, p)
ltl_task_init(p, false);
for_each_present_cpu(cpu)
ltl_task_init(idle_task(cpu), false);
read_unlock(&tasklist_lock);
return 0;
}
static void ltl_monitor_destroy(void)
{
rv_detach_trace_probe(name, task_newtask, handle_task_newtask);
rv_put_task_monitor_slot(ltl_monitor_slot);
ltl_monitor_slot = RV_PER_TASK_MONITOR_INIT;
}
static void ltl_illegal_state(struct task_struct *task, struct ltl_monitor *mon)
{
CONCATENATE(trace_error_, MONITOR_NAME)(task);
rv_cond_react(task);
}
static void ltl_attempt_start(struct task_struct *task, struct ltl_monitor *mon)
{
if (rv_ltl_all_atoms_known(mon))
ltl_start(task, mon);
}
static inline void ltl_atom_set(struct ltl_monitor *mon, enum ltl_atom atom, bool value)
{
__clear_bit(atom, mon->unknown_atoms);
if (value)
__set_bit(atom, mon->atoms);
else
__clear_bit(atom, mon->atoms);
}
static void
ltl_trace_event(struct task_struct *task, struct ltl_monitor *mon, unsigned long *next_state)
{
const char *format_str = "%s";
DECLARE_SEQ_BUF(atoms, 64);
char states[32], next[32];
int i;
if (!CONCATENATE(CONCATENATE(trace_event_, MONITOR_NAME), _enabled)())
return;
snprintf(states, sizeof(states), "%*pbl", RV_MAX_BA_STATES, mon->states);
snprintf(next, sizeof(next), "%*pbl", RV_MAX_BA_STATES, next_state);
for (i = 0; i < LTL_NUM_ATOM; ++i) {
if (test_bit(i, mon->atoms)) {
seq_buf_printf(&atoms, format_str, ltl_atom_str(i));
format_str = ",%s";
}
}
CONCATENATE(trace_event_, MONITOR_NAME)(task, states, atoms.buffer, next);
}
static void ltl_validate(struct task_struct *task, struct ltl_monitor *mon)
{
DECLARE_BITMAP(next_states, RV_MAX_BA_STATES) = {0};
if (!rv_ltl_valid_state(mon))
return;
for (unsigned int i = 0; i < RV_NUM_BA_STATES; ++i) {
if (test_bit(i, mon->states))
ltl_possible_next_states(mon, i, next_states);
}
ltl_trace_event(task, mon, next_states);
memcpy(mon->states, next_states, sizeof(next_states));
if (!rv_ltl_valid_state(mon))
ltl_illegal_state(task, mon);
}
static void ltl_atom_update(struct task_struct *task, enum ltl_atom atom, bool value)
{
struct ltl_monitor *mon = ltl_get_monitor(task);
ltl_atom_set(mon, atom, value);
ltl_atoms_fetch(task, mon);
if (!rv_ltl_valid_state(mon)) {
ltl_attempt_start(task, mon);
return;
}
ltl_validate(task, mon);
}
static void __maybe_unused ltl_atom_pulse(struct task_struct *task, enum ltl_atom atom, bool value)
{
struct ltl_monitor *mon = ltl_get_monitor(task);
ltl_atom_update(task, atom, value);
ltl_atom_set(mon, atom, !value);
ltl_validate(task, mon);
}
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