linux/include/linux/torture.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Common functions for in-kernel torture tests.
 *
 * Copyright IBM Corporation, 2014
 *
 * Author: Paul E. McKenney <[email protected]>
 */

#ifndef __LINUX_TORTURE_H
#define __LINUX_TORTURE_H

#include <linux/types.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/threads.h>
#include <linux/cpumask_types.h>
#include <linux/seqlock.h>
#include <linux/lockdep.h>
#include <linux/completion.h>
#include <linux/debugobjects.h>
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/hrtimer.h>

/* Definitions for a non-string torture-test module parameter. */
#define torture_param(type, name, init, msg) …

#define TORTURE_FLAG …
#define TOROUT_STRING(s) …
#define VERBOSE_TOROUT_STRING(s) …
#define TOROUT_ERRSTRING(s) …
void verbose_torout_sleep(void);

#define torture_init_error(firsterr) …

/* Definitions for online/offline exerciser. */
#ifdef CONFIG_HOTPLUG_CPU
int torture_num_online_cpus(void);
#else /* #ifdef CONFIG_HOTPLUG_CPU */
static inline int torture_num_online_cpus(void) { return 1; }
#endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
torture_ofl_func;
bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
		     unsigned long *sum_offl, int *min_onl, int *max_onl);
bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
		    unsigned long *sum_onl, int *min_onl, int *max_onl);
int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f);
void torture_onoff_stats(void);
bool torture_onoff_failures(void);

/* Low-rider random number generator. */
struct torture_random_state { … };
#define DEFINE_TORTURE_RANDOM(name) …
#define DEFINE_TORTURE_RANDOM_PERCPU(name) …
unsigned long torture_random(struct torture_random_state *trsp);
static inline void torture_random_init(struct torture_random_state *trsp)
{ … }

/* Definitions for high-resolution-timer sleeps. */
int torture_hrtimeout_ns(ktime_t baset_ns, u32 fuzzt_ns, const enum hrtimer_mode mode,
			 struct torture_random_state *trsp);
int torture_hrtimeout_us(u32 baset_us, u32 fuzzt_ns, struct torture_random_state *trsp);
int torture_hrtimeout_ms(u32 baset_ms, u32 fuzzt_us, struct torture_random_state *trsp);
int torture_hrtimeout_jiffies(u32 baset_j, struct torture_random_state *trsp);
int torture_hrtimeout_s(u32 baset_s, u32 fuzzt_ms, struct torture_random_state *trsp);

/* Task shuffler, which causes CPUs to occasionally go idle. */
void torture_shuffle_task_register(struct task_struct *tp);
int torture_shuffle_init(long shuffint);

/* Test auto-shutdown handling. */
void torture_shutdown_absorb(const char *title);
int torture_shutdown_init(int ssecs, void (*cleanup)(void));

/* Task stuttering, which forces load/no-load transitions. */
bool stutter_wait(const char *title);
int torture_stutter_init(int s, int sgap);

/* Initialization and cleanup. */
bool torture_init_begin(char *ttype, int v);
void torture_init_end(void);
bool torture_cleanup_begin(void);
void torture_cleanup_end(void);
bool torture_must_stop(void);
bool torture_must_stop_irq(void);
void torture_kthread_stopping(char *title);
int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
			     char *f, struct task_struct **tp, void (*cbf)(struct task_struct *tp));
void _torture_stop_kthread(char *m, struct task_struct **tp);

#define torture_create_kthread(n, arg, tp) …
#define torture_create_kthread_cb(n, arg, tp, cbf) …
#define torture_stop_kthread(n, tp) …

/* Scheduler-related definitions. */
#ifdef CONFIG_PREEMPTION
#define torture_preempt_schedule() …
#else
#define torture_preempt_schedule …
#endif

#if IS_ENABLED(CONFIG_RCU_TORTURE_TEST) || IS_MODULE(CONFIG_RCU_TORTURE_TEST) || IS_ENABLED(CONFIG_LOCK_TORTURE_TEST) || IS_MODULE(CONFIG_LOCK_TORTURE_TEST)
long torture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask);
#endif

#endif /* __LINUX_TORTURE_H */