Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 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 |
Florian Ragwitz | 2b2f68b | 2010-05-24 14:33:21 -0700 | [diff] [blame] | 31 | * writes commands to <debugfs>/dynamic_debug/control |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 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) |
Yehuda Sadeh | ff49d74 | 2010-07-03 13:07:35 +1000 | [diff] [blame^] | 43 | extern int ddebug_remove_module(const char *mod_name); |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 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)) \ |
Joe Perches | 00b5586 | 2009-12-14 18:00:14 -0800 | [diff] [blame] | 60 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 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)) \ |
Joe Perches | 00b5586 | 2009-12-14 18:00:14 -0800 | [diff] [blame] | 71 | dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 72 | } while (0) |
| 73 | |
| 74 | #else |
| 75 | |
Yehuda Sadeh | ff49d74 | 2010-07-03 13:07:35 +1000 | [diff] [blame^] | 76 | static inline int ddebug_remove_module(const char *mod) |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 77 | { |
| 78 | return 0; |
| 79 | } |
| 80 | |
Joe Perches | 00b5586 | 2009-12-14 18:00:14 -0800 | [diff] [blame] | 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) |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 85 | #endif |
| 86 | |
| 87 | #endif |