1 #ifndef _DYNAMIC_DEBUG_H 2 #define _DYNAMIC_DEBUG_H 3 4 /* 5 * An instance of this structure is created in a special 6 * ELF section at every dynamic debug callsite. At runtime, 7 * the special section is treated as an array of these. 8 */ 9 struct _ddebug { 10 /* 11 * These fields are used to drive the user interface 12 * for selecting and displaying debug callsites. 13 */ 14 const char *modname; 15 const char *function; 16 const char *filename; 17 const char *format; 18 unsigned int lineno:24; 19 /* 20 * The flags field controls the behaviour at the callsite. 21 * The bits here are changed dynamically when the user 22 * writes commands to <debugfs>/dynamic_debug/control 23 */ 24 #define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ 25 #define _DPRINTK_FLAGS_INCL_MODNAME (1<<1) 26 #define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2) 27 #define _DPRINTK_FLAGS_INCL_LINENO (1<<3) 28 #define _DPRINTK_FLAGS_INCL_TID (1<<4) 29 #define _DPRINTK_FLAGS_DEFAULT 0 30 unsigned int flags:8; 31 char enabled; 32 } __attribute__((aligned(8))); 33 34 35 int ddebug_add_module(struct _ddebug *tab, unsigned int n, 36 const char *modname); 37 38 #if defined(CONFIG_DYNAMIC_DEBUG) 39 extern int ddebug_remove_module(const char *mod_name); 40 extern int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) 41 __attribute__ ((format (printf, 2, 3))); 42 43 struct device; 44 45 extern int __dynamic_dev_dbg(struct _ddebug *descriptor, 46 const struct device *dev, 47 const char *fmt, ...) 48 __attribute__ ((format (printf, 3, 4))); 49 50 struct net_device; 51 52 extern int __dynamic_netdev_dbg(struct _ddebug *descriptor, 53 const struct net_device *dev, 54 const char *fmt, ...) 55 __attribute__ ((format (printf, 3, 4))); 56 57 #define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ 58 static struct _ddebug __used __aligned(8) \ 59 __attribute__((section("__verbose"))) name = { \ 60 .modname = KBUILD_MODNAME, \ 61 .function = __func__, \ 62 .filename = __FILE__, \ 63 .format = (fmt), \ 64 .lineno = __LINE__, \ 65 .flags = _DPRINTK_FLAGS_DEFAULT, \ 66 .enabled = false, \ 67 } 68 69 #define dynamic_pr_debug(fmt, ...) \ 70 do { \ 71 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 72 if (unlikely(descriptor.enabled)) \ 73 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ 74 ##__VA_ARGS__); \ 75 } while (0) 76 77 #define dynamic_dev_dbg(dev, fmt, ...) \ 78 do { \ 79 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 80 if (unlikely(descriptor.enabled)) \ 81 __dynamic_dev_dbg(&descriptor, dev, fmt, \ 82 ##__VA_ARGS__); \ 83 } while (0) 84 85 #define dynamic_netdev_dbg(dev, fmt, ...) \ 86 do { \ 87 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 88 if (unlikely(descriptor.enabled)) \ 89 __dynamic_netdev_dbg(&descriptor, dev, fmt, \ 90 ##__VA_ARGS__); \ 91 } while (0) 92 93 #else 94 95 static inline int ddebug_remove_module(const char *mod) 96 { 97 return 0; 98 } 99 100 #define dynamic_pr_debug(fmt, ...) \ 101 do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) 102 #define dynamic_dev_dbg(dev, fmt, ...) \ 103 do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #endif 107