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e9d376f0 JB |
1 | #ifndef _DYNAMIC_DEBUG_H |
2 | #define _DYNAMIC_DEBUG_H | |
3 | ||
4 | /* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which | |
5 | * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They | |
6 | * use independent hash functions, to reduce the chance of false positives. | |
7 | */ | |
8 | extern long long dynamic_debug_enabled; | |
9 | extern long long dynamic_debug_enabled2; | |
10 | ||
11 | /* | |
12 | * An instance of this structure is created in a special | |
13 | * ELF section at every dynamic debug callsite. At runtime, | |
14 | * the special section is treated as an array of these. | |
15 | */ | |
16 | struct _ddebug { | |
17 | /* | |
18 | * These fields are used to drive the user interface | |
19 | * for selecting and displaying debug callsites. | |
20 | */ | |
21 | const char *modname; | |
22 | const char *function; | |
23 | const char *filename; | |
24 | const char *format; | |
e9d376f0 JB |
25 | unsigned int lineno:24; |
26 | /* | |
27 | * The flags field controls the behaviour at the callsite. | |
28 | * The bits here are changed dynamically when the user | |
2b2f68b5 | 29 | * writes commands to <debugfs>/dynamic_debug/control |
e9d376f0 JB |
30 | */ |
31 | #define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ | |
8ba6ebf5 BVA |
32 | #define _DPRINTK_FLAGS_INCL_MODNAME (1<<1) |
33 | #define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2) | |
34 | #define _DPRINTK_FLAGS_INCL_LINENO (1<<3) | |
35 | #define _DPRINTK_FLAGS_INCL_TID (1<<4) | |
e9d376f0 JB |
36 | #define _DPRINTK_FLAGS_DEFAULT 0 |
37 | unsigned int flags:8; | |
52159d98 | 38 | char enabled; |
e9d376f0 JB |
39 | } __attribute__((aligned(8))); |
40 | ||
41 | ||
42 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
43 | const char *modname); | |
44 | ||
45 | #if defined(CONFIG_DYNAMIC_DEBUG) | |
ff49d74a | 46 | extern int ddebug_remove_module(const char *mod_name); |
8ba6ebf5 BVA |
47 | extern int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
48 | __attribute__ ((format (printf, 2, 3))); | |
e9d376f0 | 49 | |
e9d376f0 JB |
50 | #define dynamic_pr_debug(fmt, ...) do { \ |
51 | static struct _ddebug descriptor \ | |
52 | __used \ | |
53 | __attribute__((section("__verbose"), aligned(8))) = \ | |
52159d98 JB |
54 | { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ |
55 | _DPRINTK_FLAGS_DEFAULT }; \ | |
2d75af2f | 56 | if (unlikely(descriptor.enabled)) \ |
8ba6ebf5 | 57 | __dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \ |
e9d376f0 JB |
58 | } while (0) |
59 | ||
60 | ||
61 | #define dynamic_dev_dbg(dev, fmt, ...) do { \ | |
62 | static struct _ddebug descriptor \ | |
63 | __used \ | |
64 | __attribute__((section("__verbose"), aligned(8))) = \ | |
52159d98 JB |
65 | { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ |
66 | _DPRINTK_FLAGS_DEFAULT }; \ | |
2d75af2f JB |
67 | if (unlikely(descriptor.enabled)) \ |
68 | dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ | |
e9d376f0 JB |
69 | } while (0) |
70 | ||
71 | #else | |
72 | ||
ff49d74a | 73 | static inline int ddebug_remove_module(const char *mod) |
e9d376f0 JB |
74 | { |
75 | return 0; | |
76 | } | |
77 | ||
00b55864 JP |
78 | #define dynamic_pr_debug(fmt, ...) \ |
79 | do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) | |
be70e267 | 80 | #define dynamic_dev_dbg(dev, fmt, ...) \ |
00b55864 | 81 | do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) |
e9d376f0 JB |
82 | #endif |
83 | ||
84 | #endif |