include/linux/torture.h

   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_types.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 #include <linux/hrtimer.h>
  25
  26 /* Definitions for a non-string torture-test module parameter. */
  27 #define torture_param(type, name, init, msg) \
  28         static type name = init; \
  29         module_param(name, type, 0444); \
  30         MODULE_PARM_DESC(name, msg);
  31
  32 #define TORTURE_FLAG "-torture:"
  33 #define TOROUT_STRING(s) \
  34         pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s)
  35 #define VERBOSE_TOROUT_STRING(s) \
  36 do {                                                                            \
  37         if (verbose) {                                                          \
  38                 verbose_torout_sleep();                                         \
  39                 pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s);           \
  40         }                                                                       \
  41 } while (0)
  42 #define TOROUT_ERRSTRING(s) \
  43         pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s)
  44 void verbose_torout_sleep(void);
  45
  46 #define torture_init_error(firsterr)                                            \
  47 ({                                                                              \
  48         int ___firsterr = (firsterr);                                           \
  49                                                                                 \
  50         WARN_ONCE(!IS_MODULE(CONFIG_RCU_TORTURE_TEST) && ___firsterr < 0, "Torture-test initialization failed with error code %d\n", ___firsterr); \
  51         ___firsterr < 0;                                                                \
  52 })
  53
  54 /* Definitions for online/offline exerciser. */
  55 #ifdef CONFIG_HOTPLUG_CPU
  56 int torture_num_online_cpus(void);
  57 #else /* #ifdef CONFIG_HOTPLUG_CPU */
  58 static inline int torture_num_online_cpus(void) { return 1; }
  59 #endif /* #else #ifdef CONFIG_HOTPLUG_CPU */
  60 typedef void torture_ofl_func(void);
  61 bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
  62                      unsigned long *sum_offl, int *min_onl, int *max_onl);
  63 bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
  64                     unsigned long *sum_onl, int *min_onl, int *max_onl);
  65 int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f);
  66 void torture_onoff_stats(void);
  67 bool torture_onoff_failures(void);
  68
  69 /* Low-rider random number generator. */
  70 struct torture_random_state {
  71         unsigned long trs_state;
  72         long trs_count;
  73 };
  74 #define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 }
  75 #define DEFINE_TORTURE_RANDOM_PERCPU(name) \
  76         DEFINE_PER_CPU(struct torture_random_state, name)
  77 unsigned long torture_random(struct torture_random_state *trsp);
  78 static inline void torture_random_init(struct torture_random_state *trsp)
  79 {
  80         trsp->trs_state = 0;
  81         trsp->trs_count = 0;
  82 }
  83
  84 /* Definitions for high-resolution-timer sleeps. */
  85 int torture_hrtimeout_ns(ktime_t baset_ns, u32 fuzzt_ns, const enum hrtimer_mode mode,
  86                          struct torture_random_state *trsp);
  87 int torture_hrtimeout_us(u32 baset_us, u32 fuzzt_ns, struct torture_random_state *trsp);
  88 int torture_hrtimeout_ms(u32 baset_ms, u32 fuzzt_us, struct torture_random_state *trsp);
  89 int torture_hrtimeout_jiffies(u32 baset_j, struct torture_random_state *trsp);
  90 int torture_hrtimeout_s(u32 baset_s, u32 fuzzt_ms, struct torture_random_state *trsp);
  91
  92 /* Task shuffler, which causes CPUs to occasionally go idle. */
  93 void torture_shuffle_task_register(struct task_struct *tp);
  94 int torture_shuffle_init(long shuffint);
  95
  96 /* Test auto-shutdown handling. */
  97 void torture_shutdown_absorb(const char *title);
  98 int torture_shutdown_init(int ssecs, void (*cleanup)(void));
  99
 100 /* Task stuttering, which forces load/no-load transitions. */
 101 bool stutter_wait(const char *title);
 102 int torture_stutter_init(int s, int sgap);
 103
 104 /* Initialization and cleanup. */
 105 bool torture_init_begin(char *ttype, int v);
 106 void torture_init_end(void);
 107 bool torture_cleanup_begin(void);
 108 void torture_cleanup_end(void);
 109 bool torture_must_stop(void);
 110 bool torture_must_stop_irq(void);
 111 void torture_kthread_stopping(char *title);
 112 int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
 113                              char *f, struct task_struct **tp, void (*cbf)(struct task_struct *tp));
 114 void _torture_stop_kthread(char *m, struct task_struct **tp);
 115
 116 #define torture_create_kthread(n, arg, tp) \
 117         _torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
 118                                 "Failed to create " #n, &(tp), NULL)
 119 #define torture_create_kthread_cb(n, arg, tp, cbf) \
 120         _torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
 121                                 "Failed to create " #n, &(tp), cbf)
 122 #define torture_stop_kthread(n, tp) \
 123         _torture_stop_kthread("Stopping " #n " task", &(tp))
 124
 125 /* Scheduler-related definitions. */
 126 #ifdef CONFIG_PREEMPTION
 127 #define torture_preempt_schedule() __preempt_schedule()
 128 #else
 129 #define torture_preempt_schedule()      do { } while (0)
 130 #endif
 131
 132 #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)
 133 long torture_sched_setaffinity(pid_t pid, const struct cpumask *in_mask);
 134 #endif
 135
 136 #endif /* __LINUX_TORTURE_H */