xref: /linux/kernel/trace/rv/monitors/pagefault/pagefault.h (revision 4ff261e725d7376c12e745fdbe8a33cd6dbd5a83)

/* SPDX-License-Identifier: GPL-2.0 */

/*
 * C implementation of Buchi automaton, automatically generated by
 * tools/verification/rvgen from the linear temporal logic specification.
 * For further information, see kernel documentation:
 *   Documentation/trace/rv/linear_temporal_logic.rst
 */

#include <linux/rv.h>

#define MONITOR_NAME pagefault

enum ltl_atom {
	LTL_PAGEFAULT,
	LTL_RT,
	LTL_NUM_ATOM
};
static_assert(LTL_NUM_ATOM <= RV_MAX_LTL_ATOM);

static const char *ltl_atom_str(enum ltl_atom atom)
{
	static const char *const names[] = {
		"pa",
		"rt",
	};

	return names[atom];
}

enum ltl_buchi_state {
	S0,
	RV_NUM_BA_STATES
};
static_assert(RV_NUM_BA_STATES <= RV_MAX_BA_STATES);

static void ltl_start(struct task_struct *task, struct ltl_monitor *mon)
{
	bool pagefault = test_bit(LTL_PAGEFAULT, mon->atoms);
	bool val3 = !pagefault;
	bool rt = test_bit(LTL_RT, mon->atoms);
	bool val1 = !rt;
	bool val4 = val1 || val3;

	if (val4)
		__set_bit(S0, mon->states);
}

static void
ltl_possible_next_states(struct ltl_monitor *mon, unsigned int state, unsigned long *next)
{
	bool pagefault = test_bit(LTL_PAGEFAULT, mon->atoms);
	bool val3 = !pagefault;
	bool rt = test_bit(LTL_RT, mon->atoms);
	bool val1 = !rt;
	bool val4 = val1 || val3;

	switch (state) {
	case S0:
		if (val4)
			__set_bit(S0, next);
		break;
	}
}