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:18; 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_NONE 0 25 #define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ 26 #define _DPRINTK_FLAGS_INCL_MODNAME (1<<1) 27 #define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2) 28 #define _DPRINTK_FLAGS_INCL_LINENO (1<<3) 29 #define _DPRINTK_FLAGS_INCL_TID (1<<4) 30 #if defined DEBUG 31 #define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT 32 #else 33 #define _DPRINTK_FLAGS_DEFAULT 0 34 #endif 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) 43 extern int ddebug_remove_module(const char *mod_name); 44 extern __printf(2, 3) 45 int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...); 46 47 struct device; 48 49 extern __printf(3, 4) 50 int __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev, 51 const char *fmt, ...); 52 53 struct net_device; 54 55 extern __printf(3, 4) 56 int __dynamic_netdev_dbg(struct _ddebug *descriptor, 57 const struct net_device *dev, 58 const char *fmt, ...); 59 60 #define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ 61 static struct _ddebug __used __aligned(8) \ 62 __attribute__((section("__verbose"))) name = { \ 63 .modname = KBUILD_MODNAME, \ 64 .function = __func__, \ 65 .filename = __FILE__, \ 66 .format = (fmt), \ 67 .lineno = __LINE__, \ 68 .flags = _DPRINTK_FLAGS_DEFAULT, \ 69 } 70 71 #define dynamic_pr_debug(fmt, ...) \ 72 do { \ 73 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 74 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ 75 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ 76 ##__VA_ARGS__); \ 77 } while (0) 78 79 #define dynamic_dev_dbg(dev, fmt, ...) \ 80 do { \ 81 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 82 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ 83 __dynamic_dev_dbg(&descriptor, dev, fmt, \ 84 ##__VA_ARGS__); \ 85 } while (0) 86 87 #define dynamic_netdev_dbg(dev, fmt, ...) \ 88 do { \ 89 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 90 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ 91 __dynamic_netdev_dbg(&descriptor, dev, fmt, \ 92 ##__VA_ARGS__); \ 93 } while (0) 94 95 #else 96 97 static inline int ddebug_remove_module(const char *mod) 98 { 99 return 0; 100 } 101 102 #define dynamic_pr_debug(fmt, ...) \ 103 do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) 104 #define dynamic_dev_dbg(dev, fmt, ...) \ 105 do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) 106 #endif 107 108 #endif 109