linux/include/linux/torture.h
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   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * Common functions for in-kernel torture tests.
   4 *
   5 * Copyright IBM Corporation, 2014
   6 *
   7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
   8 */
   9
  10#ifndef __LINUX_TORTURE_H
  11#define __LINUX_TORTURE_H
  12
  13#include <linux/types.h>
  14#include <linux/cache.h>
  15#include <linux/spinlock.h>
  16#include <linux/threads.h>
  17#include <linux/cpumask.h>
  18#include <linux/seqlock.h>
  19#include <linux/lockdep.h>
  20#include <linux/completion.h>
  21#include <linux/debugobjects.h>
  22#include <linux/bug.h>
  23#include <linux/compiler.h>
  24
  25/* Definitions for a non-string torture-test module parameter. */
  26#define torture_param(type, name, init, msg) \
  27        static type name = init; \
  28        module_param(name, type, 0444); \
  29        MODULE_PARM_DESC(name, msg);
  30
  31#define TORTURE_FLAG "-torture:"
  32#define TOROUT_STRING(s) \
  33        pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s)
  34#define VERBOSE_TOROUT_STRING(s) \
  35        do { if (verbose) pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s); } while (0)
  36#define VERBOSE_TOROUT_ERRSTRING(s) \
  37        do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0)
  38
  39/* Definitions for online/offline exerciser. */
  40typedef void torture_ofl_func(void);
  41bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
  42                     unsigned long *sum_offl, int *min_onl, int *max_onl);
  43bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
  44                    unsigned long *sum_onl, int *min_onl, int *max_onl);
  45int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f);
  46void torture_onoff_stats(void);
  47bool torture_onoff_failures(void);
  48
  49/* Low-rider random number generator. */
  50struct torture_random_state {
  51        unsigned long trs_state;
  52        long trs_count;
  53};
  54#define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 }
  55#define DEFINE_TORTURE_RANDOM_PERCPU(name) \
  56        DEFINE_PER_CPU(struct torture_random_state, name)
  57unsigned long torture_random(struct torture_random_state *trsp);
  58
  59/* Task shuffler, which causes CPUs to occasionally go idle. */
  60void torture_shuffle_task_register(struct task_struct *tp);
  61int torture_shuffle_init(long shuffint);
  62
  63/* Test auto-shutdown handling. */
  64void torture_shutdown_absorb(const char *title);
  65int torture_shutdown_init(int ssecs, void (*cleanup)(void));
  66
  67/* Task stuttering, which forces load/no-load transitions. */
  68bool stutter_wait(const char *title);
  69int torture_stutter_init(int s, int sgap);
  70
  71/* Initialization and cleanup. */
  72bool torture_init_begin(char *ttype, int v);
  73void torture_init_end(void);
  74bool torture_cleanup_begin(void);
  75void torture_cleanup_end(void);
  76bool torture_must_stop(void);
  77bool torture_must_stop_irq(void);
  78void torture_kthread_stopping(char *title);
  79int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
  80                             char *f, struct task_struct **tp);
  81void _torture_stop_kthread(char *m, struct task_struct **tp);
  82
  83#define torture_create_kthread(n, arg, tp) \
  84        _torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
  85                                "Failed to create " #n, &(tp))
  86#define torture_stop_kthread(n, tp) \
  87        _torture_stop_kthread("Stopping " #n " task", &(tp))
  88
  89#ifdef CONFIG_PREEMPTION
  90#define torture_preempt_schedule() preempt_schedule()
  91#else
  92#define torture_preempt_schedule()
  93#endif
  94
  95#endif /* __LINUX_TORTURE_H */
  96