root/include/linux/torture.h

INCLUDED FROM

   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. */
  40 typedef void torture_ofl_func(void);
  41 bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
  42                      unsigned long *sum_offl, int *min_onl, int *max_onl);
  43 bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
  44                     unsigned long *sum_onl, int *min_onl, int *max_onl);
  45 int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f);
  46 void torture_onoff_stats(void);
  47 bool torture_onoff_failures(void);
  48 
  49 /* Low-rider random number generator. */
  50 struct 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)
  57 unsigned long torture_random(struct torture_random_state *trsp);
  58 
  59 /* Task shuffler, which causes CPUs to occasionally go idle. */
  60 void torture_shuffle_task_register(struct task_struct *tp);
  61 int torture_shuffle_init(long shuffint);
  62 
  63 /* Test auto-shutdown handling. */
  64 void torture_shutdown_absorb(const char *title);
  65 int torture_shutdown_init(int ssecs, void (*cleanup)(void));
  66 
  67 /* Task stuttering, which forces load/no-load transitions. */
  68 bool stutter_wait(const char *title);
  69 int torture_stutter_init(int s, int sgap);
  70 
  71 /* Initialization and cleanup. */
  72 bool torture_init_begin(char *ttype, int v);
  73 void torture_init_end(void);
  74 bool torture_cleanup_begin(void);
  75 void torture_cleanup_end(void);
  76 bool torture_must_stop(void);
  77 bool torture_must_stop_irq(void);
  78 void torture_kthread_stopping(char *title);
  79 int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
  80                              char *f, struct task_struct **tp);
  81 void _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 */