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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; | |
25 | char primary_hash; | |
26 | char secondary_hash; | |
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; | |
36 | } __attribute__((aligned(8))); | |
37 | ||
38 | ||
39 | int ddebug_add_module(struct _ddebug *tab, unsigned int n, | |
40 | const char *modname); | |
41 | ||
42 | #if defined(CONFIG_DYNAMIC_DEBUG) | |
ff49d74a | 43 | extern int ddebug_remove_module(const char *mod_name); |
e9d376f0 JB |
44 | |
45 | #define __dynamic_dbg_enabled(dd) ({ \ | |
46 | int __ret = 0; \ | |
47 | if (unlikely((dynamic_debug_enabled & (1LL << DEBUG_HASH)) && \ | |
48 | (dynamic_debug_enabled2 & (1LL << DEBUG_HASH2)))) \ | |
49 | if (unlikely(dd.flags)) \ | |
50 | __ret = 1; \ | |
51 | __ret; }) | |
52 | ||
53 | #define dynamic_pr_debug(fmt, ...) do { \ | |
54 | static struct _ddebug descriptor \ | |
55 | __used \ | |
56 | __attribute__((section("__verbose"), aligned(8))) = \ | |
57 | { KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \ | |
58 | DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \ | |
59 | if (__dynamic_dbg_enabled(descriptor)) \ | |
00b55864 | 60 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ |
e9d376f0 JB |
61 | } while (0) |
62 | ||
63 | ||
64 | #define dynamic_dev_dbg(dev, fmt, ...) do { \ | |
65 | static struct _ddebug descriptor \ | |
66 | __used \ | |
67 | __attribute__((section("__verbose"), aligned(8))) = \ | |
68 | { KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \ | |
69 | DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \ | |
70 | if (__dynamic_dbg_enabled(descriptor)) \ | |
00b55864 | 71 | dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ |
e9d376f0 JB |
72 | } while (0) |
73 | ||
74 | #else | |
75 | ||
ff49d74a | 76 | static inline int ddebug_remove_module(const char *mod) |
e9d376f0 JB |
77 | { |
78 | return 0; | |
79 | } | |
80 | ||
00b55864 JP |
81 | #define dynamic_pr_debug(fmt, ...) \ |
82 | do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) | |
83 | #define dynamic_dev_dbg(dev, format, ...) \ | |
84 | do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) | |
e9d376f0 JB |
85 | #endif |
86 | ||
87 | #endif |