228 lines
6.4 KiB
C
228 lines
6.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _DYNAMIC_DEBUG_H
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#define _DYNAMIC_DEBUG_H
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#if defined(CONFIG_JUMP_LABEL)
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#include <linux/jump_label.h>
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#endif
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/*
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* An instance of this structure is created in a special
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* ELF section at every dynamic debug callsite. At runtime,
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* the special section is treated as an array of these.
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*/
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struct _ddebug {
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/*
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* These fields are used to drive the user interface
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* for selecting and displaying debug callsites.
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*/
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const char *modname;
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const char *function;
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const char *filename;
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const char *format;
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unsigned int lineno:18;
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/*
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* The flags field controls the behaviour at the callsite.
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* The bits here are changed dynamically when the user
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* writes commands to <debugfs>/dynamic_debug/control
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*/
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#define _DPRINTK_FLAGS_NONE 0
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#define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */
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#define _DPRINTK_FLAGS_INCL_MODNAME (1<<1)
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#define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2)
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#define _DPRINTK_FLAGS_INCL_LINENO (1<<3)
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#define _DPRINTK_FLAGS_INCL_TID (1<<4)
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#if defined DEBUG
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#define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT
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#else
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#define _DPRINTK_FLAGS_DEFAULT 0
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#endif
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unsigned int flags:8;
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#ifdef CONFIG_JUMP_LABEL
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union {
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struct static_key_true dd_key_true;
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struct static_key_false dd_key_false;
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} key;
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#endif
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} __attribute__((aligned(8)));
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#if defined(CONFIG_DYNAMIC_DEBUG_CORE)
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/* exported for module authors to exercise >control */
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int dynamic_debug_exec_queries(const char *query, const char *modname);
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int ddebug_add_module(struct _ddebug *tab, unsigned int n,
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const char *modname);
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extern int ddebug_remove_module(const char *mod_name);
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extern __printf(2, 3)
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void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...);
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extern int ddebug_dyndbg_module_param_cb(char *param, char *val,
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const char *modname);
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struct device;
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extern __printf(3, 4)
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void __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev,
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const char *fmt, ...);
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struct net_device;
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extern __printf(3, 4)
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void __dynamic_netdev_dbg(struct _ddebug *descriptor,
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const struct net_device *dev,
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const char *fmt, ...);
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struct ib_device;
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extern __printf(3, 4)
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void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
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const struct ib_device *ibdev,
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const char *fmt, ...);
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
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static struct _ddebug __aligned(8) \
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__section("__dyndbg") name = { \
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.modname = KBUILD_MODNAME, \
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.function = __func__, \
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.filename = __FILE__, \
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.format = (fmt), \
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.lineno = __LINE__, \
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.flags = _DPRINTK_FLAGS_DEFAULT, \
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_DPRINTK_KEY_INIT \
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}
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#ifdef CONFIG_JUMP_LABEL
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#ifdef DEBUG
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#define _DPRINTK_KEY_INIT .key.dd_key_true = (STATIC_KEY_TRUE_INIT)
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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static_branch_likely(&descriptor.key.dd_key_true)
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#else
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#define _DPRINTK_KEY_INIT .key.dd_key_false = (STATIC_KEY_FALSE_INIT)
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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static_branch_unlikely(&descriptor.key.dd_key_false)
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#endif
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#else /* !CONFIG_JUMP_LABEL */
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#define _DPRINTK_KEY_INIT
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#ifdef DEBUG
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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likely(descriptor.flags & _DPRINTK_FLAGS_PRINT)
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#else
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)
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#endif
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#endif /* CONFIG_JUMP_LABEL */
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#define __dynamic_func_call(id, fmt, func, ...) do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt); \
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if (DYNAMIC_DEBUG_BRANCH(id)) \
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func(&id, ##__VA_ARGS__); \
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} while (0)
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#define __dynamic_func_call_no_desc(id, fmt, func, ...) do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(id, fmt); \
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if (DYNAMIC_DEBUG_BRANCH(id)) \
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func(__VA_ARGS__); \
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} while (0)
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/*
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* "Factory macro" for generating a call to func, guarded by a
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* DYNAMIC_DEBUG_BRANCH. The dynamic debug descriptor will be
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* initialized using the fmt argument. The function will be called with
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* the address of the descriptor as first argument, followed by all
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* the varargs. Note that fmt is repeated in invocations of this
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* macro.
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*/
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#define _dynamic_func_call(fmt, func, ...) \
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__dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
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/*
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* A variant that does the same, except that the descriptor is not
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* passed as the first argument to the function; it is only called
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* with precisely the macro's varargs.
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*/
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#define _dynamic_func_call_no_desc(fmt, func, ...) \
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__dynamic_func_call_no_desc(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
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#define dynamic_pr_debug(fmt, ...) \
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_dynamic_func_call(fmt, __dynamic_pr_debug, \
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pr_fmt(fmt), ##__VA_ARGS__)
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#define dynamic_dev_dbg(dev, fmt, ...) \
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_dynamic_func_call(fmt,__dynamic_dev_dbg, \
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dev, fmt, ##__VA_ARGS__)
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#define dynamic_netdev_dbg(dev, fmt, ...) \
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_dynamic_func_call(fmt, __dynamic_netdev_dbg, \
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dev, fmt, ##__VA_ARGS__)
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#define dynamic_ibdev_dbg(dev, fmt, ...) \
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_dynamic_func_call(fmt, __dynamic_ibdev_dbg, \
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dev, fmt, ##__VA_ARGS__)
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#define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
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groupsize, buf, len, ascii) \
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_dynamic_func_call_no_desc(__builtin_constant_p(prefix_str) ? prefix_str : "hexdump", \
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print_hex_dump, \
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KERN_DEBUG, prefix_str, prefix_type, \
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rowsize, groupsize, buf, len, ascii)
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#else /* !CONFIG_DYNAMIC_DEBUG_CORE */
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/printk.h>
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static inline int ddebug_add_module(struct _ddebug *tab, unsigned int n,
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const char *modname)
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{
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return 0;
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}
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static inline int ddebug_remove_module(const char *mod)
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{
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return 0;
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}
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static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
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const char *modname)
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{
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if (strstr(param, "dyndbg")) {
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/* avoid pr_warn(), which wants pr_fmt() fully defined */
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printk(KERN_WARNING "dyndbg param is supported only in "
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"CONFIG_DYNAMIC_DEBUG builds\n");
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return 0; /* allow and ignore */
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}
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return -EINVAL;
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}
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#define dynamic_pr_debug(fmt, ...) \
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do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
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#define dynamic_dev_dbg(dev, fmt, ...) \
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do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
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#define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
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groupsize, buf, len, ascii) \
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do { if (0) \
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print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, \
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rowsize, groupsize, buf, len, ascii); \
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} while (0)
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static inline int dynamic_debug_exec_queries(const char *query, const char *modname)
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{
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pr_warn("kernel not built with CONFIG_DYNAMIC_DEBUG_CORE\n");
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return 0;
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}
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#endif /* !CONFIG_DYNAMIC_DEBUG_CORE */
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#endif
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