xref: /openbmc/linux/include/linux/fault-inject.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 #ifndef _LINUX_FAULT_INJECT_H
2 #define _LINUX_FAULT_INJECT_H
3 
4 #ifdef CONFIG_FAULT_INJECTION
5 
6 #include <linux/types.h>
7 #include <linux/debugfs.h>
8 #include <asm/atomic.h>
9 
10 /*
11  * For explanation of the elements of this struct, see
12  * Documentation/fault-injection/fault-injection.txt
13  */
14 struct fault_attr {
15 	unsigned long probability;
16 	unsigned long interval;
17 	atomic_t times;
18 	atomic_t space;
19 	unsigned long verbose;
20 	u32 task_filter;
21 	unsigned long stacktrace_depth;
22 	unsigned long require_start;
23 	unsigned long require_end;
24 	unsigned long reject_start;
25 	unsigned long reject_end;
26 
27 	unsigned long count;
28 
29 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
30 
31 	struct {
32 		struct dentry *dir;
33 
34 		struct dentry *probability_file;
35 		struct dentry *interval_file;
36 		struct dentry *times_file;
37 		struct dentry *space_file;
38 		struct dentry *verbose_file;
39 		struct dentry *task_filter_file;
40 		struct dentry *stacktrace_depth_file;
41 		struct dentry *require_start_file;
42 		struct dentry *require_end_file;
43 		struct dentry *reject_start_file;
44 		struct dentry *reject_end_file;
45 	} dentries;
46 
47 #endif
48 };
49 
50 #define FAULT_ATTR_INITIALIZER {				\
51 		.interval = 1,					\
52 		.times = ATOMIC_INIT(1),			\
53 		.require_end = ULONG_MAX,			\
54 		.stacktrace_depth = 32,				\
55 		.verbose = 2,					\
56 	}
57 
58 #define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
59 int setup_fault_attr(struct fault_attr *attr, char *str);
60 void should_fail_srandom(unsigned long entropy);
61 bool should_fail(struct fault_attr *attr, ssize_t size);
62 
63 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
64 
65 int init_fault_attr_dentries(struct fault_attr *attr, const char *name);
66 void cleanup_fault_attr_dentries(struct fault_attr *attr);
67 
68 #else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
69 
70 static inline int init_fault_attr_dentries(struct fault_attr *attr,
71 					  const char *name)
72 {
73 	return -ENODEV;
74 }
75 
76 static inline void cleanup_fault_attr_dentries(struct fault_attr *attr)
77 {
78 }
79 
80 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
81 
82 #endif /* CONFIG_FAULT_INJECTION */
83 
84 #endif /* _LINUX_FAULT_INJECT_H */
85