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e9d376f0 JB |
1 | #ifndef _DYNAMIC_DEBUG_H |
2 | #define _DYNAMIC_DEBUG_H | |
3 | ||
52159d98 JB |
4 | #include <linux/jump_label.h> |
5 | ||
e9d376f0 JB |
6 | /* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which |
7 | * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They | |
8 | * use independent hash functions, to reduce the chance of false positives. | |
9 | */ | |
10 | extern long long dynamic_debug_enabled; | |
11 | extern long long dynamic_debug_enabled2; | |
12 | ||
13 | /* | |
14 | * An instance of this structure is created in a special | |
15 | * ELF section at every dynamic debug callsite. At runtime, | |
16 | * the special section is treated as an array of these. | |
17 | */ | |
18 | struct _ddebug { | |
19 | /* | |
20 | * These fields are used to drive the user interface | |
21 | * for selecting and displaying debug callsites. | |
22 | */ | |
23 | const char *modname; | |
24 | const char *function; | |
25 | const char *filename; | |
26 | const char *format; | |
e9d376f0 JB |
27 | unsigned int lineno:24; |
28 | /* | |
29 | * The flags field controls the behaviour at the callsite. | |
30 | * The bits here are changed dynamically when the user | |
2b2f68b5 | 31 | * writes commands to <debugfs>/dynamic_debug/control |
e9d376f0 JB |
32 | */ |
33 | #define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ | |
34 | #define _DPRINTK_FLAGS_DEFAULT 0 | |
35 | unsigned int flags:8; | |
52159d98 | 36 | char enabled; |
e9d376f0 JB |
37 | } __attribute__((aligned(8))); |
38 | ||
39 | ||
40 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
41 | const char *modname); | |
42 | ||
43 | #if defined(CONFIG_DYNAMIC_DEBUG) | |
ff49d74a | 44 | extern int ddebug_remove_module(const char *mod_name); |
e9d376f0 | 45 | |
e9d376f0 | 46 | #define dynamic_pr_debug(fmt, ...) do { \ |
52159d98 JB |
47 | __label__ do_printk; \ |
48 | __label__ out; \ | |
e9d376f0 JB |
49 | static struct _ddebug descriptor \ |
50 | __used \ | |
51 | __attribute__((section("__verbose"), aligned(8))) = \ | |
52159d98 JB |
52 | { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ |
53 | _DPRINTK_FLAGS_DEFAULT }; \ | |
54 | JUMP_LABEL(&descriptor.enabled, do_printk); \ | |
55 | goto out; \ | |
56 | do_printk: \ | |
57 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ | |
58 | out: ; \ | |
e9d376f0 JB |
59 | } while (0) |
60 | ||
61 | ||
62 | #define dynamic_dev_dbg(dev, fmt, ...) do { \ | |
52159d98 JB |
63 | __label__ do_printk; \ |
64 | __label__ out; \ | |
e9d376f0 JB |
65 | static struct _ddebug descriptor \ |
66 | __used \ | |
67 | __attribute__((section("__verbose"), aligned(8))) = \ | |
52159d98 JB |
68 | { KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \ |
69 | _DPRINTK_FLAGS_DEFAULT }; \ | |
70 | JUMP_LABEL(&descriptor.enabled, do_printk); \ | |
71 | goto out; \ | |
72 | do_printk: \ | |
73 | dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ | |
74 | out: ; \ | |
e9d376f0 JB |
75 | } while (0) |
76 | ||
77 | #else | |
78 | ||
ff49d74a | 79 | static inline int ddebug_remove_module(const char *mod) |
e9d376f0 JB |
80 | { |
81 | return 0; | |
82 | } | |
83 | ||
00b55864 JP |
84 | #define dynamic_pr_debug(fmt, ...) \ |
85 | do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) | |
be70e267 | 86 | #define dynamic_dev_dbg(dev, fmt, ...) \ |
00b55864 | 87 | do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) |
e9d376f0 JB |
88 | #endif |
89 | ||
90 | #endif |