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185 lines
5.0 KiB
185 lines
5.0 KiB
#ifndef _DYNAMIC_DEBUG_H |
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#define _DYNAMIC_DEBUG_H |
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#if defined(CC_HAVE_ASM_GOTO) && 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 HAVE_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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int ddebug_add_module(struct _ddebug *tab, unsigned int n, |
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const char *modname); |
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#if defined(CONFIG_DYNAMIC_DEBUG) |
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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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#define DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, key, init) \ |
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static struct _ddebug __aligned(8) \ |
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__attribute__((section("__verbose"))) 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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dd_key_init(key, init) \ |
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} |
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#ifdef HAVE_JUMP_LABEL |
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#define dd_key_init(key, init) key = (init) |
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#ifdef DEBUG |
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ |
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DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, .key.dd_key_true, \ |
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(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 DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ |
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DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, .key.dd_key_false, \ |
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(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 |
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#define dd_key_init(key, init) |
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \ |
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DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, 0, 0) |
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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 |
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#define dynamic_pr_debug(fmt, ...) \ |
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do { \ |
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ |
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \ |
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__dynamic_pr_debug(&descriptor, pr_fmt(fmt), \ |
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##__VA_ARGS__); \ |
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} while (0) |
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#define dynamic_dev_dbg(dev, fmt, ...) \ |
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do { \ |
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ |
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \ |
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__dynamic_dev_dbg(&descriptor, dev, fmt, \ |
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##__VA_ARGS__); \ |
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} while (0) |
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#define dynamic_netdev_dbg(dev, fmt, ...) \ |
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do { \ |
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ |
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \ |
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__dynamic_netdev_dbg(&descriptor, dev, fmt, \ |
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##__VA_ARGS__); \ |
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} 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 { \ |
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, \ |
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__builtin_constant_p(prefix_str) ? prefix_str : "hexdump");\ |
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \ |
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print_hex_dump(KERN_DEBUG, prefix_str, \ |
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prefix_type, rowsize, groupsize, \ |
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buf, len, ascii); \ |
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} while (0) |
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#else |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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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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#endif |
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#endif
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