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linux-headers-5.4.0-215
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dynamic_debug.h
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/* 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 /* * 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; #ifdef CONFIG_JUMP_LABEL union { struct static_key_true dd_key_true; struct static_key_false dd_key_false; } key; #endif } __attribute__((aligned(8))); #if defined(CONFIG_DYNAMIC_DEBUG) int ddebug_add_module(struct _ddebug *tab, unsigned int n, const char *modname); 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, ...); 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(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, \ _DPRINTK_KEY_INIT \ } #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 /* !HAVE_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 #define __dynamic_func_call(id, fmt, func, ...) do { \ DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt); \ if (DYNAMIC_DEBUG_BRANCH(id)) \ func(&id, ##__VA_ARGS__); \ } while (0) #define __dynamic_func_call_no_desc(id, fmt, func, ...) do { \ DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt); \ if (DYNAMIC_DEBUG_BRANCH(id)) \ func(__VA_ARGS__); \ } while (0) /* * "Factory macro" for generating a call to func, guarded by a * DYNAMIC_DEBUG_BRANCH. The dynamic debug decriptor 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(fmt, func, ...) \ __dynamic_func_call(__UNIQUE_ID(ddebug), 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_no_desc(fmt, func, ...) \ __dynamic_func_call_no_desc(__UNIQUE_ID(ddebug), fmt, func, ##__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) #else #include <linux/string.h> #include <linux/errno.h> static inline int ddebug_add_module(struct _ddebug *tab, unsigned int n, const char *modname) { return 0; } 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 (!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; } #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 #endif