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346e15be JB |
1 | #ifndef _DYNAMIC_PRINTK_H |
2 | #define _DYNAMIC_PRINTK_H | |
3 | ||
4 | #define DYNAMIC_DEBUG_HASH_BITS 6 | |
5 | #define DEBUG_HASH_TABLE_SIZE (1 << DYNAMIC_DEBUG_HASH_BITS) | |
6 | ||
7 | #define TYPE_BOOLEAN 1 | |
8 | ||
9 | #define DYNAMIC_ENABLED_ALL 0 | |
10 | #define DYNAMIC_ENABLED_NONE 1 | |
11 | #define DYNAMIC_ENABLED_SOME 2 | |
12 | ||
13 | extern int dynamic_enabled; | |
14 | ||
15 | /* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which | |
16 | * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They | |
17 | * use independent hash functions, to reduce the chance of false positives. | |
18 | */ | |
19 | extern long long dynamic_printk_enabled; | |
20 | extern long long dynamic_printk_enabled2; | |
21 | ||
22 | struct mod_debug { | |
23 | char *modname; | |
24 | char *logical_modname; | |
25 | char *flag_names; | |
26 | int type; | |
27 | int hash; | |
28 | int hash2; | |
29 | } __attribute__((aligned(8))); | |
30 | ||
31 | int register_dynamic_debug_module(char *mod_name, int type, char *share_name, | |
32 | char *flags, int hash, int hash2); | |
33 | ||
34 | #if defined(CONFIG_DYNAMIC_PRINTK_DEBUG) | |
35 | extern int unregister_dynamic_debug_module(char *mod_name); | |
36 | extern int __dynamic_dbg_enabled_helper(char *modname, int type, | |
37 | int value, int hash); | |
38 | ||
39 | #define __dynamic_dbg_enabled(module, type, value, level, hash) ({ \ | |
40 | int __ret = 0; \ | |
41 | if (unlikely((dynamic_printk_enabled & (1LL << DEBUG_HASH)) && \ | |
42 | (dynamic_printk_enabled2 & (1LL << DEBUG_HASH2)))) \ | |
43 | __ret = __dynamic_dbg_enabled_helper(module, type, \ | |
44 | value, hash);\ | |
45 | __ret; }) | |
46 | ||
47 | #define dynamic_pr_debug(fmt, ...) do { \ | |
48 | static char mod_name[] \ | |
49 | __attribute__((section("__verbose_strings"))) \ | |
50 | = KBUILD_MODNAME; \ | |
51 | static struct mod_debug descriptor \ | |
52 | __used \ | |
53 | __attribute__((section("__verbose"), aligned(8))) = \ | |
54 | { mod_name, mod_name, NULL, TYPE_BOOLEAN, DEBUG_HASH, DEBUG_HASH2 };\ | |
55 | if (__dynamic_dbg_enabled(KBUILD_MODNAME, TYPE_BOOLEAN, \ | |
56 | 0, 0, DEBUG_HASH)) \ | |
57 | printk(KERN_DEBUG KBUILD_MODNAME ":" fmt, \ | |
58 | ##__VA_ARGS__); \ | |
59 | } while (0) | |
60 | ||
61 | #define dynamic_dev_dbg(dev, format, ...) do { \ | |
62 | static char mod_name[] \ | |
63 | __attribute__((section("__verbose_strings"))) \ | |
64 | = KBUILD_MODNAME; \ | |
65 | static struct mod_debug descriptor \ | |
66 | __used \ | |
67 | __attribute__((section("__verbose"), aligned(8))) = \ | |
68 | { mod_name, mod_name, NULL, TYPE_BOOLEAN, DEBUG_HASH, DEBUG_HASH2 };\ | |
69 | if (__dynamic_dbg_enabled(KBUILD_MODNAME, TYPE_BOOLEAN, \ | |
70 | 0, 0, DEBUG_HASH)) \ | |
71 | dev_printk(KERN_DEBUG, dev, \ | |
72 | KBUILD_MODNAME ": " format, \ | |
73 | ##__VA_ARGS__); \ | |
74 | } while (0) | |
75 | ||
76 | #else | |
77 | ||
78 | static inline int unregister_dynamic_debug_module(const char *mod_name) | |
79 | { | |
80 | return 0; | |
81 | } | |
82 | static inline int __dynamic_dbg_enabled_helper(char *modname, int type, | |
83 | int value, int hash) | |
84 | { | |
85 | return 0; | |
86 | } | |
87 | ||
88 | #define __dynamic_dbg_enabled(module, type, value, level, hash) ({ 0; }) | |
89 | #define dynamic_pr_debug(fmt, ...) do { } while (0) | |
90 | #define dynamic_dev_dbg(dev, format, ...) do { } while (0) | |
91 | #endif | |
92 | ||
93 | #endif |