diff options
Diffstat (limited to 'kernel/include/linux/dynamic_debug.h')
| -rw-r--r-- | kernel/include/linux/dynamic_debug.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/kernel/include/linux/dynamic_debug.h b/kernel/include/linux/dynamic_debug.h new file mode 100644 index 000000000..4f1bbc68c --- /dev/null +++ b/kernel/include/linux/dynamic_debug.h @@ -0,0 +1,137 @@ +#ifndef _DYNAMIC_DEBUG_H +#define _DYNAMIC_DEBUG_H + +/* + * An instance of this structure is created in a special + * ELF section at every dynamic debug callsite. At runtime, + * the special section is treated as an array of these. + */ +struct _ddebug { + /* + * These fields are used to drive the user interface + * for selecting and displaying debug callsites. + */ + const char *modname; + const char *function; + const char *filename; + const char *format; + unsigned int lineno:18; + /* + * The flags field controls the behaviour at the callsite. + * The bits here are changed dynamically when the user + * writes commands to <debugfs>/dynamic_debug/control + */ +#define _DPRINTK_FLAGS_NONE 0 +#define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */ +#define _DPRINTK_FLAGS_INCL_MODNAME (1<<1) +#define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2) +#define _DPRINTK_FLAGS_INCL_LINENO (1<<3) +#define _DPRINTK_FLAGS_INCL_TID (1<<4) +#if defined DEBUG +#define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT +#else +#define _DPRINTK_FLAGS_DEFAULT 0 +#endif + unsigned int flags:8; +} __attribute__((aligned(8))); + + +int ddebug_add_module(struct _ddebug *tab, unsigned int n, + const char *modname); + +#if defined(CONFIG_DYNAMIC_DEBUG) +extern int ddebug_remove_module(const char *mod_name); +extern __printf(2, 3) +void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...); + +extern int ddebug_dyndbg_module_param_cb(char *param, char *val, + const char *modname); + +struct device; + +extern __printf(3, 4) +void __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev, + const char *fmt, ...); + +struct net_device; + +extern __printf(3, 4) +void __dynamic_netdev_dbg(struct _ddebug *descriptor, + const struct net_device *dev, + const char *fmt, ...); + +#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ + static struct _ddebug __aligned(8) \ + __attribute__((section("__verbose"))) name = { \ + .modname = KBUILD_MODNAME, \ + .function = __func__, \ + .filename = __FILE__, \ + .format = (fmt), \ + .lineno = __LINE__, \ + .flags = _DPRINTK_FLAGS_DEFAULT, \ + } + +#define dynamic_pr_debug(fmt, ...) \ +do { \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ + if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ + __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ + ##__VA_ARGS__); \ +} while (0) + +#define dynamic_dev_dbg(dev, fmt, ...) \ +do { \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ + if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ + __dynamic_dev_dbg(&descriptor, dev, fmt, \ + ##__VA_ARGS__); \ +} while (0) + +#define dynamic_netdev_dbg(dev, fmt, ...) \ +do { \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ + if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ + __dynamic_netdev_dbg(&descriptor, dev, fmt, \ + ##__VA_ARGS__); \ +} while (0) + +#define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \ + groupsize, buf, len, ascii) \ +do { \ + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, \ + __builtin_constant_p(prefix_str) ? prefix_str : "hexdump");\ + if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \ + print_hex_dump(KERN_DEBUG, prefix_str, \ + prefix_type, rowsize, groupsize, \ + buf, len, ascii); \ +} while (0) + +#else + +#include <linux/string.h> +#include <linux/errno.h> + +static inline int ddebug_remove_module(const char *mod) +{ + return 0; +} + +static inline int ddebug_dyndbg_module_param_cb(char *param, char *val, + const char *modname) +{ + if (strstr(param, "dyndbg")) { + /* avoid pr_warn(), which wants pr_fmt() fully defined */ + printk(KERN_WARNING "dyndbg param is supported only in " + "CONFIG_DYNAMIC_DEBUG builds\n"); + return 0; /* allow and ignore */ + } + return -EINVAL; +} + +#define dynamic_pr_debug(fmt, ...) \ + do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0) +#define dynamic_dev_dbg(dev, fmt, ...) \ + do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0) +#endif + +#endif |