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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_FAULT_INJECT_H
3#define _LINUX_FAULT_INJECT_H
4
5#ifdef CONFIG_FAULT_INJECTION
6
7#include <linux/types.h>
8#include <linux/debugfs.h>
9#include <linux/ratelimit.h>
10#include <linux/atomic.h>
11
12/*
13 * For explanation of the elements of this struct, see
14 * Documentation/fault-injection/fault-injection.rst
15 */
16struct fault_attr {
17 unsigned long probability;
18 unsigned long interval;
19 atomic_t times;
20 atomic_t space;
21 unsigned long verbose;
22 bool task_filter;
23 unsigned long stacktrace_depth;
24 unsigned long require_start;
25 unsigned long require_end;
26 unsigned long reject_start;
27 unsigned long reject_end;
28
29 unsigned long count;
30 struct ratelimit_state ratelimit_state;
31 struct dentry *dname;
32};
33
34enum fault_flags {
35 FAULT_NOWARN = 1 << 0,
36};
37
38#define FAULT_ATTR_INITIALIZER { \
39 .interval = 1, \
40 .times = ATOMIC_INIT(1), \
41 .require_end = ULONG_MAX, \
42 .stacktrace_depth = 32, \
43 .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \
44 .verbose = 2, \
45 .dname = NULL, \
46 }
47
48#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
49int setup_fault_attr(struct fault_attr *attr, char *str);
50bool should_fail_ex(struct fault_attr *attr, ssize_t size, int flags);
51bool should_fail(struct fault_attr *attr, ssize_t size);
52
53#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
54
55struct dentry *fault_create_debugfs_attr(const char *name,
56 struct dentry *parent, struct fault_attr *attr);
57
58#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
59
60static inline struct dentry *fault_create_debugfs_attr(const char *name,
61 struct dentry *parent, struct fault_attr *attr)
62{
63 return ERR_PTR(-ENODEV);
64}
65
66#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
67
68#endif /* CONFIG_FAULT_INJECTION */
69
70struct kmem_cache;
71
72bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order);
73
74int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
75#ifdef CONFIG_FAILSLAB
76extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags);
77#else
78static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
79{
80 return false;
81}
82#endif /* CONFIG_FAILSLAB */
83
84#endif /* _LINUX_FAULT_INJECT_H */