include/linux/torture.h

   1 /*
   2  * Common functions for in-kernel torture tests.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, you can access it online at
  16  * http://www.gnu.org/licenses/gpl-2.0.html.
  17  *
  18  * Copyright IBM Corporation, 2014
  19  *
  20  * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
  21  */
  22
  23 #ifndef __LINUX_TORTURE_H
  24 #define __LINUX_TORTURE_H
  25
  26 #include <linux/types.h>
  27 #include <linux/cache.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/threads.h>
  30 #include <linux/cpumask.h>
  31 #include <linux/seqlock.h>
  32 #include <linux/lockdep.h>
  33 #include <linux/completion.h>
  34 #include <linux/debugobjects.h>
  35 #include <linux/bug.h>
  36 #include <linux/compiler.h>
  37
  38 /* Definitions for a non-string torture-test module parameter. */
  39 #define torture_param(type, name, init, msg) \
  40         static type name = init; \
  41         module_param(name, type, 0444); \
  42         MODULE_PARM_DESC(name, msg);
  43
  44 #define TORTURE_FLAG "-torture:"
  45 #define TOROUT_STRING(s) \
  46         pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s)
  47 #define VERBOSE_TOROUT_STRING(s) \
  48         do { if (verbose) pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s); } while (0)
  49 #define VERBOSE_TOROUT_ERRSTRING(s) \
  50         do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0)
  51
  52 /* Definitions for online/offline exerciser. */
  53 bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
  54                      unsigned long *sum_offl, int *min_onl, int *max_onl);
  55 bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
  56                     unsigned long *sum_onl, int *min_onl, int *max_onl);
  57 int torture_onoff_init(long ooholdoff, long oointerval);
  58 void torture_onoff_stats(void);
  59 bool torture_onoff_failures(void);
  60
  61 /* Low-rider random number generator. */
  62 struct torture_random_state {
  63         unsigned long trs_state;
  64         long trs_count;
  65 };
  66 #define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 }
  67 unsigned long torture_random(struct torture_random_state *trsp);
  68
  69 /* Task shuffler, which causes CPUs to occasionally go idle. */
  70 void torture_shuffle_task_register(struct task_struct *tp);
  71 int torture_shuffle_init(long shuffint);
  72
  73 /* Test auto-shutdown handling. */
  74 void torture_shutdown_absorb(const char *title);
  75 int torture_shutdown_init(int ssecs, void (*cleanup)(void));
  76
  77 /* Task stuttering, which forces load/no-load transitions. */
  78 void stutter_wait(const char *title);
  79 int torture_stutter_init(int s);
  80
  81 /* Initialization and cleanup. */
  82 bool torture_init_begin(char *ttype, bool v);
  83 void torture_init_end(void);
  84 bool torture_cleanup_begin(void);
  85 void torture_cleanup_end(void);
  86 bool torture_must_stop(void);
  87 bool torture_must_stop_irq(void);
  88 void torture_kthread_stopping(char *title);
  89 int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
  90                              char *f, struct task_struct **tp);
  91 void _torture_stop_kthread(char *m, struct task_struct **tp);
  92
  93 #define torture_create_kthread(n, arg, tp) \
  94         _torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
  95                                 "Failed to create " #n, &(tp))
  96 #define torture_stop_kthread(n, tp) \
  97         _torture_stop_kthread("Stopping " #n " task", &(tp))
  98
  99 #ifdef CONFIG_PREEMPT
 100 #define torture_preempt_schedule() preempt_schedule()
 101 #else
 102 #define torture_preempt_schedule()
 103 #endif
 104
 105 #endif /* __LINUX_TORTURE_H */