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dynamic_debug.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _DYNAMIC_DEBUG_H #define _DYNAMIC_DEBUG_H #if defined(CONFIG_JUMP_LABEL) #include <linux/jump_label.h> #endif #include <linux/build_bug.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; #define CLS_BITS 6 unsigned int class_id:CLS_BITS; #define _DPRINTK_CLASS_DFLT ((1 << CLS_BITS) - 1) /* * 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) #define _DPRINTK_FLAGS_INCL_SOURCENAME (1<<5) #define _DPRINTK_FLAGS_INCL_ANY \ (_DPRINTK_FLAGS_INCL_MODNAME | _DPRINTK_FLAGS_INCL_FUNCNAME |\ _DPRINTK_FLAGS_INCL_LINENO | _DPRINTK_FLAGS_INCL_TID |\ _DPRINTK_FLAGS_INCL_SOURCENAME) #if defined DEBUG #define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT #else #define _DPRINTK_FLAGS_DEFAULT 0 #endif unsigned int flags:8; #ifdef CONFIG_JUMP_LABEL union { struct static_key_true dd_key_true; struct static_key_false dd_key_false; } key; #endif } __attribute__((aligned(8))); enum class_map_type { DD_CLASS_TYPE_DISJOINT_BITS, /** * DD_CLASS_TYPE_DISJOINT_BITS: classes are independent, one per bit. * expecting hex input. Built for drm.debug, basis for other types. */ DD_CLASS_TYPE_LEVEL_NUM, /** * DD_CLASS_TYPE_LEVEL_NUM: input is numeric level, 0-N. * N turns on just bits N-1 .. 0, so N=0 turns all bits off. */ DD_CLASS_TYPE_DISJOINT_NAMES, /** * DD_CLASS_TYPE_DISJOINT_NAMES: input is a CSV of [+-]CLASS_NAMES, * classes are independent, like _DISJOINT_BITS. */ DD_CLASS_TYPE_LEVEL_NAMES, /** * DD_CLASS_TYPE_LEVEL_NAMES: input is a CSV of [+-]CLASS_NAMES, * intended for names like: INFO,DEBUG,TRACE, with a module prefix * avoid EMERG,ALERT,CRIT,ERR,WARNING: they're not debug */ }; struct ddebug_class_map { struct list_head link; struct module *mod; const char *mod_name; /* needed for builtins */ const char **class_names; const int length; const int base; /* index of 1st .class_id, allows split/shared space */ enum class_map_type map_type; }; /** * DECLARE_DYNDBG_CLASSMAP - declare classnames known by a module * @_var: a struct ddebug_class_map, passed to module_param_cb * @_type: enum class_map_type, chooses bits/verbose, numeric/symbolic * @_base: offset of 1st class-name. splits .class_id space * @classes: class-names used to control class'd prdbgs */ #define DECLARE_DYNDBG_CLASSMAP(_var, _maptype, _base, ...) \ static const char *_var##_classnames[] = { __VA_ARGS__ }; \ static struct ddebug_class_map __aligned(8) __used \ __section("__dyndbg_classes") _var = { \ .mod = THIS_MODULE, \ .mod_name = KBUILD_MODNAME, \ .base = _base, \ .map_type = _maptype, \ .length = NUM_TYPE_ARGS(char*, __VA_ARGS__), \ .class_names = _var##_classnames, \ } #define NUM_TYPE_ARGS(eltype, ...) \ (sizeof((eltype[]){__VA_ARGS__}) / sizeof(eltype)) /* encapsulate linker provided built-in (or module) dyndbg data */ struct _ddebug_info { struct _ddebug *descs; struct ddebug_class_map *classes; unsigned int num_descs; unsigned int num_classes; }; struct ddebug_class_param { union { unsigned long *bits; unsigned int *lvl; }; char flags[8]; const struct ddebug_class_map *map; }; /* * pr_debug() and friends are globally enabled or modules have selectively * enabled them. */ #if defined(CONFIG_DYNAMIC_DEBUG) || \ (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE)) extern __printf(2, 3) void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...); 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, ...); struct ib_device; extern __printf(3, 4) void __dynamic_ibdev_dbg(struct _ddebug *descriptor, const struct ib_device *ibdev, const char *fmt, ...); #define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \ static struct _ddebug __aligned(8) \ __section("__dyndbg") name = { \ .modname = KBUILD_MODNAME, \ .function = __func__, \ .filename = __FILE__, \ .format = (fmt), \ .lineno = __LINE__, \ .flags = _DPRINTK_FLAGS_DEFAULT, \ .class_id = cls, \ _DPRINTK_KEY_INIT \ }; \ BUILD_BUG_ON_MSG(cls > _DPRINTK_CLASS_DFLT, \ "classid value overflow") #define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, _DPRINTK_CLASS_DFLT, fmt) #ifdef CONFIG_JUMP_LABEL #ifdef DEBUG #define _DPRINTK_KEY_INIT .key.dd_key_true = (STATIC_KEY_TRUE_INIT) #define DYNAMIC_DEBUG_BRANCH(descriptor) \ static_branch_likely(&descriptor.key.dd_key_true) #else #define _DPRINTK_KEY_INIT .key.dd_key_false = (STATIC_KEY_FALSE_INIT) #define DYNAMIC_DEBUG_BRANCH(descriptor) \ static_branch_unlikely(&descriptor.key.dd_key_false) #endif #else /* !CONFIG_JUMP_LABEL */ #define _DPRINTK_KEY_INIT #ifdef DEBUG #define DYNAMIC_DEBUG_BRANCH(descriptor) \ likely(descriptor.flags & _DPRINTK_FLAGS_PRINT) #else #define DYNAMIC_DEBUG_BRANCH(descriptor) \ unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) #endif #endif /* CONFIG_JUMP_LABEL */ /* * Factory macros: ($prefix)dynamic_func_call($suffix) * * Lower layer (with __ prefix) gets the callsite metadata, and wraps * the func inside a debug-branch/static-key construct. Upper layer * (with _ prefix) does the UNIQUE_ID once, so that lower can ref the * name/label multiple times, and tie the elements together. * Multiple flavors: * (|_cls): adds in _DPRINT_CLASS_DFLT as needed * (|_no_desc): former gets callsite descriptor as 1st arg (for prdbgs) */ #define __dynamic_func_call_cls(id, cls, fmt, func, ...) do { \ DEFINE_DYNAMIC_DEBUG_METADATA_CLS(id, cls, fmt); \ if (DYNAMIC_DEBUG_BRANCH(id)) \ func(&id, ##__VA_ARGS__); \ } while (0) #define __dynamic_func_call(id, fmt, func, ...) \ __dynamic_func_call_cls(id, _DPRINTK_CLASS_DFLT, fmt, \ func, ##__VA_ARGS__) #define __dynamic_func_call_cls_no_desc(id, cls, fmt, func, ...) do { \ DEFINE_DYNAMIC_DEBUG_METADATA_CLS(id, cls, fmt); \ if (DYNAMIC_DEBUG_BRANCH(id)) \ func(__VA_ARGS__); \ } while (0) #define __dynamic_func_call_no_desc(id, fmt, func, ...) \ __dynamic_func_call_cls_no_desc(id, _DPRINTK_CLASS_DFLT, \ fmt, func, ##__VA_ARGS__) /* * "Factory macro" for generating a call to func, guarded by a * DYNAMIC_DEBUG_BRANCH. The dynamic debug descriptor will be * initialized using the fmt argument. The function will be called with * the address of the descriptor as first argument, followed by all * the varargs. Note that fmt is repeated in invocations of this * macro. */ #define _dynamic_func_call_cls(cls, fmt, func, ...) \ __dynamic_func_call_cls(__UNIQUE_ID(ddebug), cls, fmt, func, ##__VA_ARGS__) #define _dynamic_func_call(fmt, func, ...) \ _dynamic_func_call_cls(_DPRINTK_CLASS_DFLT, fmt, func, ##__VA_ARGS__) /* * A variant that does the same, except that the descriptor is not * passed as the first argument to the function; it is only called * with precisely the macro's varargs. */ #define _dynamic_func_call_cls_no_desc(cls, fmt, func, ...) \ __dynamic_func_call_cls_no_desc(__UNIQUE_ID(ddebug), cls, fmt, \ func, ##__VA_ARGS__) #define _dynamic_func_call_no_desc(fmt, func, ...) \ _dynamic_func_call_cls_no_desc(_DPRINTK_CLASS_DFLT, fmt, \ func, ##__VA_ARGS__) #define dynamic_pr_debug_cls(cls, fmt, ...) \ _dynamic_func_call_cls(cls, fmt, __dynamic_pr_debug, \ pr_fmt(fmt), ##__VA_ARGS__) #define dynamic_pr_debug(fmt, ...) \ _dynamic_func_call(fmt, __dynamic_pr_debug, \ pr_fmt(fmt), ##__VA_ARGS__) #define dynamic_dev_dbg(dev, fmt, ...) \ _dynamic_func_call(fmt, __dynamic_dev_dbg, \ dev, fmt, ##__VA_ARGS__) #define dynamic_netdev_dbg(dev, fmt, ...) \ _dynamic_func_call(fmt, __dynamic_netdev_dbg, \ dev, fmt, ##__VA_ARGS__) #define dynamic_ibdev_dbg(dev, fmt, ...) \ _dynamic_func_call(fmt, __dynamic_ibdev_dbg, \ dev, fmt, ##__VA_ARGS__) #define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \ groupsize, buf, len, ascii) \ _dynamic_func_call_no_desc(__builtin_constant_p(prefix_str) ? prefix_str : "hexdump", \ print_hex_dump, \ KERN_DEBUG, prefix_str, prefix_type, \ rowsize, groupsize, buf, len, ascii) /* for test only, generally expect drm.debug style macro wrappers */ #define __pr_debug_cls(cls, fmt, ...) do { \ BUILD_BUG_ON_MSG(!__builtin_constant_p(cls), \ "expecting constant class int/enum"); \ dynamic_pr_debug_cls(cls, fmt, ##__VA_ARGS__); \ } while (0) #else /* !(CONFIG_DYNAMIC_DEBUG || (CONFIG_DYNAMIC_DEBUG_CORE && DYNAMIC_DEBUG_MODULE)) */ #include <linux/string.h> #include <linux/errno.h> #include <linux/printk.h> #define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) #define DYNAMIC_DEBUG_BRANCH(descriptor) false #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) #define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \ groupsize, buf, len, ascii) \ do { if (0) \ print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, \ rowsize, groupsize, buf, len, ascii); \ } while (0) #endif /* CONFIG_DYNAMIC_DEBUG || (CONFIG_DYNAMIC_DEBUG_CORE && DYNAMIC_DEBUG_MODULE) */ #ifdef CONFIG_DYNAMIC_DEBUG_CORE extern int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *modname); struct kernel_param; int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp); int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp); #else static inline int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *modname) { if (!strcmp(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; } struct kernel_param; static inline int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp) { return 0; } static inline int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp) { return 0; } #endif extern const struct kernel_param_ops param_ops_dyndbg_classes; #endif /* _DYNAMIC_DEBUG_H */
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