| 1 | |
| 2 | * lib/dynamic_debug.c
|
| 3 | *
|
| 4 | * make pr_debug()/dev_dbg() calls runtime configurable based upon their
|
| 5 | * source module.
|
| 6 | *
|
| 7 | * Copyright (C) 2008 Jason Baron <[email protected]>
|
| 8 | * By Greg Banks <[email protected]>
|
| 9 | * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved.
|
| 10 | * Copyright (C) 2011 Bart Van Assche. All Rights Reserved.
|
| 11 | * Copyright (C) 2013 Du, Changbin <[email protected]>
|
| 12 |
|
| 13 |
|
| 14 | #define pr_fmt(fmt) "dyndbg: " fmt
|
| 15 |
|
| 16 | #include <linux/kernel.h>
|
| 17 | #include <linux/module.h>
|
| 18 | #include <linux/moduleparam.h>
|
| 19 | #include <linux/kallsyms.h>
|
| 20 | #include <linux/types.h>
|
| 21 | #include <linux/mutex.h>
|
| 22 | #include <linux/proc_fs.h>
|
| 23 | #include <linux/seq_file.h>
|
| 24 | #include <linux/list.h>
|
| 25 | #include <linux/sysctl.h>
|
| 26 | #include <linux/ctype.h>
|
| 27 | #include <linux/string.h>
|
| 28 | #include <linux/parser.h>
|
| 29 | #include <linux/string_helpers.h>
|
| 30 | #include <linux/uaccess.h>
|
| 31 | #include <linux/dynamic_debug.h>
|
| 32 | #include <linux/debugfs.h>
|
| 33 | #include <linux/slab.h>
|
| 34 | #include <linux/jump_label.h>
|
| 35 | #include <linux/hardirq.h>
|
| 36 | #include <linux/sched.h>
|
| 37 | #include <linux/device.h>
|
| 38 | #include <linux/netdevice.h>
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| 39 |
|
| 40 | #include <rdma/ib_verbs.h>
|
| 41 |
|
| 42 | extern struct _ddebug __start___dyndbg[];
|
| 43 | extern struct _ddebug __stop___dyndbg[];
|
| 44 | extern struct ddebug_class_map __start___dyndbg_classes[];
|
| 45 | extern struct ddebug_class_map __stop___dyndbg_classes[];
|
| 46 |
|
| 47 | struct ddebug_table {
|
| 48 | struct list_head link, maps;
|
| 49 | const char *mod_name;
|
| 50 | unsigned int num_ddebugs;
|
| 51 | struct _ddebug *ddebugs;
|
| 52 | };
|
| 53 |
|
| 54 | struct ddebug_query {
|
| 55 | const char *filename;
|
| 56 | const char *module;
|
| 57 | const char *function;
|
| 58 | const char *format;
|
| 59 | const char *class_string;
|
| 60 | unsigned int first_lineno, last_lineno;
|
| 61 | };
|
| 62 |
|
| 63 | struct ddebug_iter {
|
| 64 | struct ddebug_table *table;
|
| 65 | int idx;
|
| 66 | };
|
| 67 |
|
| 68 | struct flag_settings {
|
| 69 | unsigned int flags;
|
| 70 | unsigned int mask;
|
| 71 | };
|
| 72 |
|
| 73 | static DEFINE_MUTEX(ddebug_lock);
|
| 74 | static LIST_HEAD(ddebug_tables);
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| 75 | static int verbose;
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| 76 | module_param(verbose, int, 0644);
|
| 77 | MODULE_PARM_DESC(verbose, " dynamic_debug/control processing "
|
| 78 | "( 0 = off (default), 1 = module add/rm, 2 = >control summary, 3 = parsing, 4 = per-site changes)");
|
| 79 |
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| 80 |
|
| 81 | static inline const char *trim_prefix(const char *path)
|
| 82 | {
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| 83 | int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c");
|
| 84 |
|
| 85 | if (strncmp(path, __FILE__, skip))
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| 86 | skip = 0;
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| 87 |
|
| 88 | return path + skip;
|
| 89 | }
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| 90 |
|
| 91 | static const struct { unsigned flag:8; char opt_char; } opt_array[] = {
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| 92 | { _DPRINTK_FLAGS_PRINT, 'p' },
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| 93 | { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
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| 94 | { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
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| 95 | { _DPRINTK_FLAGS_INCL_SOURCENAME, 's' },
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| 96 | { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
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| 97 | { _DPRINTK_FLAGS_INCL_TID, 't' },
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| 98 | { _DPRINTK_FLAGS_NONE, '_' },
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| 99 | };
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| 100 |
|
| 101 | struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; };
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| 102 |
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| 103 |
|
| 104 | static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb)
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| 105 | {
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| 106 | char *p = fb->buf;
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| 107 | int i;
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| 108 |
|
| 109 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
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| 110 | if (flags & opt_array[i].flag)
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| 111 | *p++ = opt_array[i].opt_char;
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| 112 | if (p == fb->buf)
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| 113 | *p++ = '_';
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| 114 | *p = '\0';
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| 115 |
|
| 116 | return fb->buf;
|
| 117 | }
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| 118 |
|
| 119 | #define vnpr_info(lvl, fmt, ...) \
|
| 120 | do { \
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| 121 | if (verbose >= lvl) \
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| 122 | pr_info(fmt, ##__VA_ARGS__); \
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| 123 | } while (0)
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| 124 |
|
| 125 | #define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__)
|
| 126 | #define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__)
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| 127 | #define v3pr_info(fmt, ...) vnpr_info(3, fmt, ##__VA_ARGS__)
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| 128 | #define v4pr_info(fmt, ...) vnpr_info(4, fmt, ##__VA_ARGS__)
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| 129 |
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| 130 | static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
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| 131 | {
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| 132 |
|
| 133 | int fmtlen = 0;
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| 134 |
|
| 135 | if (query->format) {
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| 136 | fmtlen = strlen(query->format);
|
| 137 | while (fmtlen && query->format[fmtlen - 1] == '\n')
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| 138 | fmtlen--;
|
| 139 | }
|
| 140 |
|
| 141 | v3pr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u class=%s\n",
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| 142 | msg,
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| 143 | query->function ?: "",
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| 144 | query->filename ?: "",
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| 145 | query->module ?: "",
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| 146 | fmtlen, query->format ?: "",
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| 147 | query->first_lineno, query->last_lineno, query->class_string);
|
| 148 | }
|
| 149 |
|
| 150 | static struct ddebug_class_map *ddebug_find_valid_class(struct ddebug_table const *dt,
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| 151 | const char *class_string, int *class_id)
|
| 152 | {
|
| 153 | struct ddebug_class_map *map;
|
| 154 | int idx;
|
| 155 |
|
| 156 | list_for_each_entry(map, &dt->maps, link) {
|
| 157 | idx = match_string(map->class_names, map->length, class_string);
|
| 158 | if (idx >= 0) {
|
| 159 | *class_id = idx + map->base;
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| 160 | return map;
|
| 161 | }
|
| 162 | }
|
| 163 | *class_id = -ENOENT;
|
| 164 | return NULL;
|
| 165 | }
|
| 166 |
|
| 167 | #define __outvar
|
| 168 | |
| 169 | * Search the tables for _ddebug's which match the given `query' and
|
| 170 | * apply the `flags' and `mask' to them. Returns number of matching
|
| 171 | * callsites, normally the same as number of changes. If verbose,
|
| 172 | * logs the changes. Takes ddebug_lock.
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| 173 |
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| 174 | static int ddebug_change(const struct ddebug_query *query,
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| 175 | struct flag_settings *modifiers)
|
| 176 | {
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| 177 | int i;
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| 178 | struct ddebug_table *dt;
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| 179 | unsigned int newflags;
|
| 180 | unsigned int nfound = 0;
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| 181 | struct flagsbuf fbuf, nbuf;
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| 182 | struct ddebug_class_map *map = NULL;
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| 183 | int __outvar valid_class;
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| 184 |
|
| 185 |
|
| 186 | mutex_lock(&ddebug_lock);
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| 187 | list_for_each_entry(dt, &ddebug_tables, link) {
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| 188 |
|
| 189 |
|
| 190 | if (query->module &&
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| 191 | !match_wildcard(query->module, dt->mod_name))
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| 192 | continue;
|
| 193 |
|
| 194 | if (query->class_string) {
|
| 195 | map = ddebug_find_valid_class(dt, query->class_string, &valid_class);
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| 196 | if (!map)
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| 197 | continue;
|
| 198 | } else {
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| 199 |
|
| 200 | valid_class = _DPRINTK_CLASS_DFLT;
|
| 201 | }
|
| 202 |
|
| 203 | for (i = 0; i < dt->num_ddebugs; i++) {
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| 204 | struct _ddebug *dp = &dt->ddebugs[i];
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| 205 |
|
| 206 |
|
| 207 | if (dp->class_id != valid_class)
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| 208 | continue;
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| 209 |
|
| 210 |
|
| 211 | if (query->filename &&
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| 212 | !match_wildcard(query->filename, dp->filename) &&
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| 213 | !match_wildcard(query->filename,
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| 214 | kbasename(dp->filename)) &&
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| 215 | !match_wildcard(query->filename,
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| 216 | trim_prefix(dp->filename)))
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| 217 | continue;
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| 218 |
|
| 219 |
|
| 220 | if (query->function &&
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| 221 | !match_wildcard(query->function, dp->function))
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| 222 | continue;
|
| 223 |
|
| 224 |
|
| 225 | if (query->format) {
|
| 226 | if (*query->format == '^') {
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| 227 | char *p;
|
| 228 |
|
| 229 | p = strstr(dp->format, query->format+1);
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| 230 | if (p != dp->format)
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| 231 | continue;
|
| 232 | } else if (!strstr(dp->format, query->format))
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| 233 | continue;
|
| 234 | }
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| 235 |
|
| 236 |
|
| 237 | if (query->first_lineno &&
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| 238 | dp->lineno < query->first_lineno)
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| 239 | continue;
|
| 240 | if (query->last_lineno &&
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| 241 | dp->lineno > query->last_lineno)
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| 242 | continue;
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| 243 |
|
| 244 | nfound++;
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| 245 |
|
| 246 | newflags = (dp->flags & modifiers->mask) | modifiers->flags;
|
| 247 | if (newflags == dp->flags)
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| 248 | continue;
|
| 249 | #ifdef CONFIG_JUMP_LABEL
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| 250 | if (dp->flags & _DPRINTK_FLAGS_PRINT) {
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| 251 | if (!(newflags & _DPRINTK_FLAGS_PRINT))
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| 252 | static_branch_disable(&dp->key.dd_key_true);
|
| 253 | } else if (newflags & _DPRINTK_FLAGS_PRINT) {
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| 254 | static_branch_enable(&dp->key.dd_key_true);
|
| 255 | }
|
| 256 | #endif
|
| 257 | v4pr_info("changed %s:%d [%s]%s %s => %s\n",
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| 258 | trim_prefix(dp->filename), dp->lineno,
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| 259 | dt->mod_name, dp->function,
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| 260 | ddebug_describe_flags(dp->flags, &fbuf),
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| 261 | ddebug_describe_flags(newflags, &nbuf));
|
| 262 | dp->flags = newflags;
|
| 263 | }
|
| 264 | }
|
| 265 | mutex_unlock(&ddebug_lock);
|
| 266 |
|
| 267 | if (!nfound && verbose)
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| 268 | pr_info("no matches for query\n");
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| 269 |
|
| 270 | return nfound;
|
| 271 | }
|
| 272 |
|
| 273 | |
| 274 | * Split the buffer `buf' into space-separated words.
|
| 275 | * Handles simple " and ' quoting, i.e. without nested,
|
| 276 | * embedded or escaped \". Return the number of words
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| 277 | * or <0 on error.
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| 278 |
|
| 279 | static int ddebug_tokenize(char *buf, char *words[], int maxwords)
|
| 280 | {
|
| 281 | int nwords = 0;
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| 282 |
|
| 283 | while (*buf) {
|
| 284 | char *end;
|
| 285 |
|
| 286 |
|
| 287 | buf = skip_spaces(buf);
|
| 288 | if (!*buf)
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| 289 | break;
|
| 290 | if (*buf == '#')
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| 291 | break;
|
| 292 |
|
| 293 |
|
| 294 | if (*buf == '"' || *buf == '\'') {
|
| 295 | int quote = *buf++;
|
| 296 | for (end = buf; *end && *end != quote; end++)
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| 297 | ;
|
| 298 | if (!*end) {
|
| 299 | pr_err("unclosed quote: %s\n", buf);
|
| 300 | return -EINVAL;
|
| 301 | }
|
| 302 | } else {
|
| 303 | for (end = buf; *end && !isspace(*end); end++)
|
| 304 | ;
|
| 305 | if (end == buf) {
|
| 306 | pr_err("parse err after word:%d=%s\n", nwords,
|
| 307 | nwords ? words[nwords - 1] : "<none>");
|
| 308 | return -EINVAL;
|
| 309 | }
|
| 310 | }
|
| 311 |
|
| 312 |
|
| 313 | if (nwords == maxwords) {
|
| 314 | pr_err("too many words, legal max <=%d\n", maxwords);
|
| 315 | return -EINVAL;
|
| 316 | }
|
| 317 | if (*end)
|
| 318 | *end++ = '\0';
|
| 319 | words[nwords++] = buf;
|
| 320 | buf = end;
|
| 321 | }
|
| 322 |
|
| 323 | if (verbose >= 3) {
|
| 324 | int i;
|
| 325 | pr_info("split into words:");
|
| 326 | for (i = 0; i < nwords; i++)
|
| 327 | pr_cont(" \"%s\"", words[i]);
|
| 328 | pr_cont("\n");
|
| 329 | }
|
| 330 |
|
| 331 | return nwords;
|
| 332 | }
|
| 333 |
|
| 334 | |
| 335 | * Parse a single line number. Note that the empty string ""
|
| 336 | * is treated as a special case and converted to zero, which
|
| 337 | * is later treated as a "don't care" value.
|
| 338 |
|
| 339 | static inline int parse_lineno(const char *str, unsigned int *val)
|
| 340 | {
|
| 341 | BUG_ON(str == NULL);
|
| 342 | if (*str == '\0') {
|
| 343 | *val = 0;
|
| 344 | return 0;
|
| 345 | }
|
| 346 | if (kstrtouint(str, 10, val) < 0) {
|
| 347 | pr_err("bad line-number: %s\n", str);
|
| 348 | return -EINVAL;
|
| 349 | }
|
| 350 | return 0;
|
| 351 | }
|
| 352 |
|
| 353 | static int parse_linerange(struct ddebug_query *query, const char *first)
|
| 354 | {
|
| 355 | char *last = strchr(first, '-');
|
| 356 |
|
| 357 | if (query->first_lineno || query->last_lineno) {
|
| 358 | pr_err("match-spec: line used 2x\n");
|
| 359 | return -EINVAL;
|
| 360 | }
|
| 361 | if (last)
|
| 362 | *last++ = '\0';
|
| 363 | if (parse_lineno(first, &query->first_lineno) < 0)
|
| 364 | return -EINVAL;
|
| 365 | if (last) {
|
| 366 |
|
| 367 | if (parse_lineno(last, &query->last_lineno) < 0)
|
| 368 | return -EINVAL;
|
| 369 |
|
| 370 |
|
| 371 | if (query->last_lineno == 0)
|
| 372 | query->last_lineno = UINT_MAX;
|
| 373 |
|
| 374 | if (query->last_lineno < query->first_lineno) {
|
| 375 | pr_err("last-line:%d < 1st-line:%d\n",
|
| 376 | query->last_lineno,
|
| 377 | query->first_lineno);
|
| 378 | return -EINVAL;
|
| 379 | }
|
| 380 | } else {
|
| 381 | query->last_lineno = query->first_lineno;
|
| 382 | }
|
| 383 | v3pr_info("parsed line %d-%d\n", query->first_lineno,
|
| 384 | query->last_lineno);
|
| 385 | return 0;
|
| 386 | }
|
| 387 |
|
| 388 | static int check_set(const char **dest, char *src, char *name)
|
| 389 | {
|
| 390 | int rc = 0;
|
| 391 |
|
| 392 | if (*dest) {
|
| 393 | rc = -EINVAL;
|
| 394 | pr_err("match-spec:%s val:%s overridden by %s\n",
|
| 395 | name, *dest, src);
|
| 396 | }
|
| 397 | *dest = src;
|
| 398 | return rc;
|
| 399 | }
|
| 400 |
|
| 401 | |
| 402 | * Parse words[] as a ddebug query specification, which is a series
|
| 403 | * of (keyword, value) pairs chosen from these possibilities:
|
| 404 | *
|
| 405 | * func <function-name>
|
| 406 | * file <full-pathname>
|
| 407 | * file <base-filename>
|
| 408 | * module <module-name>
|
| 409 | * format <escaped-string-to-find-in-format>
|
| 410 | * line <lineno>
|
| 411 | * line <first-lineno>-<last-lineno> // where either may be empty
|
| 412 | *
|
| 413 | * Only 1 of each type is allowed.
|
| 414 | * Returns 0 on success, <0 on error.
|
| 415 |
|
| 416 | static int ddebug_parse_query(char *words[], int nwords,
|
| 417 | struct ddebug_query *query, const char *modname)
|
| 418 | {
|
| 419 | unsigned int i;
|
| 420 | int rc = 0;
|
| 421 | char *fline;
|
| 422 |
|
| 423 |
|
| 424 | if (nwords % 2 != 0) {
|
| 425 | pr_err("expecting pairs of match-spec <value>\n");
|
| 426 | return -EINVAL;
|
| 427 | }
|
| 428 |
|
| 429 | for (i = 0; i < nwords; i += 2) {
|
| 430 | char *keyword = words[i];
|
| 431 | char *arg = words[i+1];
|
| 432 |
|
| 433 | if (!strcmp(keyword, "func")) {
|
| 434 | rc = check_set(&query->function, arg, "func");
|
| 435 | } else if (!strcmp(keyword, "file")) {
|
| 436 | if (check_set(&query->filename, arg, "file"))
|
| 437 | return -EINVAL;
|
| 438 |
|
| 439 |
|
| 440 | fline = strchr(query->filename, ':');
|
| 441 | if (!fline)
|
| 442 | continue;
|
| 443 | *fline++ = '\0';
|
| 444 | if (isalpha(*fline) || *fline == '*' || *fline == '?') {
|
| 445 |
|
| 446 | if (check_set(&query->function, fline, "func"))
|
| 447 | return -EINVAL;
|
| 448 | } else {
|
| 449 | if (parse_linerange(query, fline))
|
| 450 | return -EINVAL;
|
| 451 | }
|
| 452 | } else if (!strcmp(keyword, "module")) {
|
| 453 | rc = check_set(&query->module, arg, "module");
|
| 454 | } else if (!strcmp(keyword, "format")) {
|
| 455 | string_unescape_inplace(arg, UNESCAPE_SPACE |
|
| 456 | UNESCAPE_OCTAL |
|
| 457 | UNESCAPE_SPECIAL);
|
| 458 | rc = check_set(&query->format, arg, "format");
|
| 459 | } else if (!strcmp(keyword, "line")) {
|
| 460 | if (parse_linerange(query, arg))
|
| 461 | return -EINVAL;
|
| 462 | } else if (!strcmp(keyword, "class")) {
|
| 463 | rc = check_set(&query->class_string, arg, "class");
|
| 464 | } else {
|
| 465 | pr_err("unknown keyword \"%s\"\n", keyword);
|
| 466 | return -EINVAL;
|
| 467 | }
|
| 468 | if (rc)
|
| 469 | return rc;
|
| 470 | }
|
| 471 | if (!query->module && modname)
|
| 472 | |
| 473 | * support $modname.dyndbg=<multiple queries>, when
|
| 474 | * not given in the query itself
|
| 475 |
|
| 476 | query->module = modname;
|
| 477 |
|
| 478 | vpr_info_dq(query, "parsed");
|
| 479 | return 0;
|
| 480 | }
|
| 481 |
|
| 482 | |
| 483 | * Parse `str' as a flags specification, format [-+=][p]+.
|
| 484 | * Sets up *maskp and *flagsp to be used when changing the
|
| 485 | * flags fields of matched _ddebug's. Returns 0 on success
|
| 486 | * or <0 on error.
|
| 487 |
|
| 488 | static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
|
| 489 | {
|
| 490 | int op, i;
|
| 491 |
|
| 492 | switch (*str) {
|
| 493 | case '+':
|
| 494 | case '-':
|
| 495 | case '=':
|
| 496 | op = *str++;
|
| 497 | break;
|
| 498 | default:
|
| 499 | pr_err("bad flag-op %c, at start of %s\n", *str, str);
|
| 500 | return -EINVAL;
|
| 501 | }
|
| 502 | v3pr_info("op='%c'\n", op);
|
| 503 |
|
| 504 | for (; *str ; ++str) {
|
| 505 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
|
| 506 | if (*str == opt_array[i].opt_char) {
|
| 507 | modifiers->flags |= opt_array[i].flag;
|
| 508 | break;
|
| 509 | }
|
| 510 | }
|
| 511 | if (i < 0) {
|
| 512 | pr_err("unknown flag '%c'\n", *str);
|
| 513 | return -EINVAL;
|
| 514 | }
|
| 515 | }
|
| 516 | v3pr_info("flags=0x%x\n", modifiers->flags);
|
| 517 |
|
| 518 |
|
| 519 | switch (op) {
|
| 520 | case '=':
|
| 521 |
|
| 522 | modifiers->mask = 0;
|
| 523 | break;
|
| 524 | case '+':
|
| 525 | modifiers->mask = ~0U;
|
| 526 | break;
|
| 527 | case '-':
|
| 528 | modifiers->mask = ~modifiers->flags;
|
| 529 | modifiers->flags = 0;
|
| 530 | break;
|
| 531 | }
|
| 532 | v3pr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask);
|
| 533 |
|
| 534 | return 0;
|
| 535 | }
|
| 536 |
|
| 537 | static int ddebug_exec_query(char *query_string, const char *modname)
|
| 538 | {
|
| 539 | struct flag_settings modifiers = {};
|
| 540 | struct ddebug_query query = {};
|
| 541 | #define MAXWORDS 9
|
| 542 | int nwords, nfound;
|
| 543 | char *words[MAXWORDS];
|
| 544 |
|
| 545 | nwords = ddebug_tokenize(query_string, words, MAXWORDS);
|
| 546 | if (nwords <= 0) {
|
| 547 | pr_err("tokenize failed\n");
|
| 548 | return -EINVAL;
|
| 549 | }
|
| 550 |
|
| 551 | if (ddebug_parse_flags(words[nwords-1], &modifiers)) {
|
| 552 | pr_err("flags parse failed\n");
|
| 553 | return -EINVAL;
|
| 554 | }
|
| 555 | if (ddebug_parse_query(words, nwords-1, &query, modname)) {
|
| 556 | pr_err("query parse failed\n");
|
| 557 | return -EINVAL;
|
| 558 | }
|
| 559 |
|
| 560 | nfound = ddebug_change(&query, &modifiers);
|
| 561 | vpr_info_dq(&query, nfound ? "applied" : "no-match");
|
| 562 |
|
| 563 | return nfound;
|
| 564 | }
|
| 565 |
|
| 566 | |
| 567 | last error or number of matching callsites. Module name is either
|
| 568 | in param (for boot arg) or perhaps in query string.
|
| 569 |
|
| 570 | static int ddebug_exec_queries(char *query, const char *modname)
|
| 571 | {
|
| 572 | char *split;
|
| 573 | int i, errs = 0, exitcode = 0, rc, nfound = 0;
|
| 574 |
|
| 575 | for (i = 0; query; query = split) {
|
| 576 | split = strpbrk(query, ";\n");
|
| 577 | if (split)
|
| 578 | *split++ = '\0';
|
| 579 |
|
| 580 | query = skip_spaces(query);
|
| 581 | if (!query || !*query || *query == '#')
|
| 582 | continue;
|
| 583 |
|
| 584 | vpr_info("query %d: \"%s\" mod:%s\n", i, query, modname ?: "*");
|
| 585 |
|
| 586 | rc = ddebug_exec_query(query, modname);
|
| 587 | if (rc < 0) {
|
| 588 | errs++;
|
| 589 | exitcode = rc;
|
| 590 | } else {
|
| 591 | nfound += rc;
|
| 592 | }
|
| 593 | i++;
|
| 594 | }
|
| 595 | if (i)
|
| 596 | v2pr_info("processed %d queries, with %d matches, %d errs\n",
|
| 597 | i, nfound, errs);
|
| 598 |
|
| 599 | if (exitcode)
|
| 600 | return exitcode;
|
| 601 | return nfound;
|
| 602 | }
|
| 603 |
|
| 604 |
|
| 605 | static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
|
| 606 | unsigned long *new_bits, unsigned long *old_bits)
|
| 607 | {
|
| 608 | #define QUERY_SIZE 128
|
| 609 | char query[QUERY_SIZE];
|
| 610 | const struct ddebug_class_map *map = dcp->map;
|
| 611 | int matches = 0;
|
| 612 | int bi, ct;
|
| 613 |
|
| 614 | v2pr_info("apply: 0x%lx to: 0x%lx\n", *new_bits, *old_bits);
|
| 615 |
|
| 616 | for (bi = 0; bi < map->length; bi++) {
|
| 617 | if (test_bit(bi, new_bits) == test_bit(bi, old_bits))
|
| 618 | continue;
|
| 619 |
|
| 620 | snprintf(query, QUERY_SIZE, "class %s %c%s", map->class_names[bi],
|
| 621 | test_bit(bi, new_bits) ? '+' : '-', dcp->flags);
|
| 622 |
|
| 623 | ct = ddebug_exec_queries(query, NULL);
|
| 624 | matches += ct;
|
| 625 |
|
| 626 | v2pr_info("bit_%d: %d matches on class: %s -> 0x%lx\n", bi,
|
| 627 | ct, map->class_names[bi], *new_bits);
|
| 628 | }
|
| 629 | return matches;
|
| 630 | }
|
| 631 |
|
| 632 |
|
| 633 | #define KP_NAME(kp) kp->name
|
| 634 |
|
| 635 | #define CLASSMAP_BITMASK(width) ((1UL << (width)) - 1)
|
| 636 |
|
| 637 |
|
| 638 | static int param_set_dyndbg_classnames(const char *instr, const struct kernel_param *kp)
|
| 639 | {
|
| 640 | const struct ddebug_class_param *dcp = kp->arg;
|
| 641 | const struct ddebug_class_map *map = dcp->map;
|
| 642 | unsigned long curr_bits, old_bits;
|
| 643 | char *cl_str, *p, *tmp;
|
| 644 | int cls_id, totct = 0;
|
| 645 | bool wanted;
|
| 646 |
|
| 647 | cl_str = tmp = kstrdup_and_replace(instr, '\n', '\0', GFP_KERNEL);
|
| 648 | if (!tmp)
|
| 649 | return -ENOMEM;
|
| 650 |
|
| 651 |
|
| 652 | curr_bits = old_bits = *dcp->bits;
|
| 653 | vpr_info("\"%s\" > %s:0x%lx\n", cl_str, KP_NAME(kp), curr_bits);
|
| 654 |
|
| 655 | for (; cl_str; cl_str = p) {
|
| 656 | p = strchr(cl_str, ',');
|
| 657 | if (p)
|
| 658 | *p++ = '\0';
|
| 659 |
|
| 660 | if (*cl_str == '-') {
|
| 661 | wanted = false;
|
| 662 | cl_str++;
|
| 663 | } else {
|
| 664 | wanted = true;
|
| 665 | if (*cl_str == '+')
|
| 666 | cl_str++;
|
| 667 | }
|
| 668 | cls_id = match_string(map->class_names, map->length, cl_str);
|
| 669 | if (cls_id < 0) {
|
| 670 | pr_err("%s unknown to %s\n", cl_str, KP_NAME(kp));
|
| 671 | continue;
|
| 672 | }
|
| 673 |
|
| 674 |
|
| 675 | switch (map->map_type) {
|
| 676 | case DD_CLASS_TYPE_DISJOINT_NAMES:
|
| 677 |
|
| 678 | if (test_bit(cls_id, &curr_bits) == wanted) {
|
| 679 | v3pr_info("no change on %s\n", cl_str);
|
| 680 | continue;
|
| 681 | }
|
| 682 | curr_bits ^= BIT(cls_id);
|
| 683 | totct += ddebug_apply_class_bitmap(dcp, &curr_bits, dcp->bits);
|
| 684 | *dcp->bits = curr_bits;
|
| 685 | v2pr_info("%s: changed bit %d:%s\n", KP_NAME(kp), cls_id,
|
| 686 | map->class_names[cls_id]);
|
| 687 | break;
|
| 688 | case DD_CLASS_TYPE_LEVEL_NAMES:
|
| 689 |
|
| 690 | old_bits = CLASSMAP_BITMASK(*dcp->lvl);
|
| 691 | curr_bits = CLASSMAP_BITMASK(cls_id + (wanted ? 1 : 0 ));
|
| 692 |
|
| 693 | totct += ddebug_apply_class_bitmap(dcp, &curr_bits, &old_bits);
|
| 694 | *dcp->lvl = (cls_id + (wanted ? 1 : 0));
|
| 695 | v2pr_info("%s: changed bit-%d: \"%s\" %lx->%lx\n", KP_NAME(kp), cls_id,
|
| 696 | map->class_names[cls_id], old_bits, curr_bits);
|
| 697 | break;
|
| 698 | default:
|
| 699 | pr_err("illegal map-type value %d\n", map->map_type);
|
| 700 | }
|
| 701 | }
|
| 702 | kfree(tmp);
|
| 703 | vpr_info("total matches: %d\n", totct);
|
| 704 | return 0;
|
| 705 | }
|
| 706 |
|
| 707 | |
| 708 | * param_set_dyndbg_classes - class FOO >control
|
| 709 | * @instr: string echo>d to sysfs, input depends on map_type
|
| 710 | * @kp: kp->arg has state: bits/lvl, map, map_type
|
| 711 | *
|
| 712 | * Enable/disable prdbgs by their class, as given in the arguments to
|
| 713 | * DECLARE_DYNDBG_CLASSMAP. For LEVEL map-types, enforce relative
|
| 714 | * levels by bitpos.
|
| 715 | *
|
| 716 | * Returns: 0 or <0 if error.
|
| 717 |
|
| 718 | int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
|
| 719 | {
|
| 720 | const struct ddebug_class_param *dcp = kp->arg;
|
| 721 | const struct ddebug_class_map *map = dcp->map;
|
| 722 | unsigned long inrep, new_bits, old_bits;
|
| 723 | int rc, totct = 0;
|
| 724 |
|
| 725 | switch (map->map_type) {
|
| 726 |
|
| 727 | case DD_CLASS_TYPE_DISJOINT_NAMES:
|
| 728 | case DD_CLASS_TYPE_LEVEL_NAMES:
|
| 729 |
|
| 730 | return param_set_dyndbg_classnames(instr, kp);
|
| 731 |
|
| 732 | case DD_CLASS_TYPE_DISJOINT_BITS:
|
| 733 | case DD_CLASS_TYPE_LEVEL_NUM:
|
| 734 |
|
| 735 | rc = kstrtoul(instr, 0, &inrep);
|
| 736 | if (rc) {
|
| 737 | pr_err("expecting numeric input: %s > %s\n", instr, KP_NAME(kp));
|
| 738 | return -EINVAL;
|
| 739 | }
|
| 740 | break;
|
| 741 | default:
|
| 742 | pr_err("%s: bad map type: %d\n", KP_NAME(kp), map->map_type);
|
| 743 | return -EINVAL;
|
| 744 | }
|
| 745 |
|
| 746 |
|
| 747 | switch (map->map_type) {
|
| 748 | case DD_CLASS_TYPE_DISJOINT_BITS:
|
| 749 |
|
| 750 | if (inrep & ~CLASSMAP_BITMASK(map->length)) {
|
| 751 | pr_warn("%s: input: 0x%lx exceeds mask: 0x%lx, masking\n",
|
| 752 | KP_NAME(kp), inrep, CLASSMAP_BITMASK(map->length));
|
| 753 | inrep &= CLASSMAP_BITMASK(map->length);
|
| 754 | }
|
| 755 | v2pr_info("bits:%lx > %s\n", inrep, KP_NAME(kp));
|
| 756 | totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits);
|
| 757 | *dcp->bits = inrep;
|
| 758 | break;
|
| 759 | case DD_CLASS_TYPE_LEVEL_NUM:
|
| 760 |
|
| 761 | if (inrep > map->length) {
|
| 762 | pr_warn("%s: level:%ld exceeds max:%d, clamping\n",
|
| 763 | KP_NAME(kp), inrep, map->length);
|
| 764 | inrep = map->length;
|
| 765 | }
|
| 766 | old_bits = CLASSMAP_BITMASK(*dcp->lvl);
|
| 767 | new_bits = CLASSMAP_BITMASK(inrep);
|
| 768 | v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
|
| 769 | totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits);
|
| 770 | *dcp->lvl = inrep;
|
| 771 | break;
|
| 772 | default:
|
| 773 | pr_warn("%s: bad map type: %d\n", KP_NAME(kp), map->map_type);
|
| 774 | }
|
| 775 | vpr_info("%s: total matches: %d\n", KP_NAME(kp), totct);
|
| 776 | return 0;
|
| 777 | }
|
| 778 | EXPORT_SYMBOL(param_set_dyndbg_classes);
|
| 779 |
|
| 780 | |
| 781 | * param_get_dyndbg_classes - classes reader
|
| 782 | * @buffer: string description of controlled bits -> classes
|
| 783 | * @kp: kp->arg has state: bits, map
|
| 784 | *
|
| 785 | * Reads last written state, underlying prdbg state may have been
|
| 786 | * altered by direct >control. Displays 0x for DISJOINT, 0-N for
|
| 787 | * LEVEL Returns: #chars written or <0 on error
|
| 788 |
|
| 789 | int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp)
|
| 790 | {
|
| 791 | const struct ddebug_class_param *dcp = kp->arg;
|
| 792 | const struct ddebug_class_map *map = dcp->map;
|
| 793 |
|
| 794 | switch (map->map_type) {
|
| 795 |
|
| 796 | case DD_CLASS_TYPE_DISJOINT_NAMES:
|
| 797 | case DD_CLASS_TYPE_DISJOINT_BITS:
|
| 798 | return scnprintf(buffer, PAGE_SIZE, "0x%lx\n", *dcp->bits);
|
| 799 |
|
| 800 | case DD_CLASS_TYPE_LEVEL_NAMES:
|
| 801 | case DD_CLASS_TYPE_LEVEL_NUM:
|
| 802 | return scnprintf(buffer, PAGE_SIZE, "%d\n", *dcp->lvl);
|
| 803 | default:
|
| 804 | return -1;
|
| 805 | }
|
| 806 | }
|
| 807 | EXPORT_SYMBOL(param_get_dyndbg_classes);
|
| 808 |
|
| 809 | const struct kernel_param_ops param_ops_dyndbg_classes = {
|
| 810 | .set = param_set_dyndbg_classes,
|
| 811 | .get = param_get_dyndbg_classes,
|
| 812 | };
|
| 813 | EXPORT_SYMBOL(param_ops_dyndbg_classes);
|
| 814 |
|
| 815 | #define PREFIX_SIZE 128
|
| 816 |
|
| 817 | static int remaining(int wrote)
|
| 818 | {
|
| 819 | if (PREFIX_SIZE - wrote > 0)
|
| 820 | return PREFIX_SIZE - wrote;
|
| 821 | return 0;
|
| 822 | }
|
| 823 |
|
| 824 | static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
|
| 825 | {
|
| 826 | int pos_after_tid;
|
| 827 | int pos = 0;
|
| 828 |
|
| 829 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
|
| 830 | if (in_interrupt())
|
| 831 | pos += snprintf(buf + pos, remaining(pos), "<intr> ");
|
| 832 | else
|
| 833 | pos += snprintf(buf + pos, remaining(pos), "[%d] ",
|
| 834 | task_pid_vnr(current));
|
| 835 | }
|
| 836 | pos_after_tid = pos;
|
| 837 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
|
| 838 | pos += snprintf(buf + pos, remaining(pos), "%s:",
|
| 839 | desc->modname);
|
| 840 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
|
| 841 | pos += snprintf(buf + pos, remaining(pos), "%s:",
|
| 842 | desc->function);
|
| 843 | if (desc->flags & _DPRINTK_FLAGS_INCL_SOURCENAME)
|
| 844 | pos += snprintf(buf + pos, remaining(pos), "%s:",
|
| 845 | trim_prefix(desc->filename));
|
| 846 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
|
| 847 | pos += snprintf(buf + pos, remaining(pos), "%d:",
|
| 848 | desc->lineno);
|
| 849 | if (pos - pos_after_tid)
|
| 850 | pos += snprintf(buf + pos, remaining(pos), " ");
|
| 851 | if (pos >= PREFIX_SIZE)
|
| 852 | buf[PREFIX_SIZE - 1] = '\0';
|
| 853 |
|
| 854 | return buf;
|
| 855 | }
|
| 856 |
|
| 857 | static inline char *dynamic_emit_prefix(struct _ddebug *desc, char *buf)
|
| 858 | {
|
| 859 | if (unlikely(desc->flags & _DPRINTK_FLAGS_INCL_ANY))
|
| 860 | return __dynamic_emit_prefix(desc, buf);
|
| 861 | return buf;
|
| 862 | }
|
| 863 |
|
| 864 | void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
|
| 865 | {
|
| 866 | va_list args;
|
| 867 | struct va_format vaf;
|
| 868 | char buf[PREFIX_SIZE] = "";
|
| 869 |
|
| 870 | BUG_ON(!descriptor);
|
| 871 | BUG_ON(!fmt);
|
| 872 |
|
| 873 | va_start(args, fmt);
|
| 874 |
|
| 875 | vaf.fmt = fmt;
|
| 876 | vaf.va = &args;
|
| 877 |
|
| 878 | printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
|
| 879 |
|
| 880 | va_end(args);
|
| 881 | }
|
| 882 | EXPORT_SYMBOL(__dynamic_pr_debug);
|
| 883 |
|
| 884 | void __dynamic_dev_dbg(struct _ddebug *descriptor,
|
| 885 | const struct device *dev, const char *fmt, ...)
|
| 886 | {
|
| 887 | struct va_format vaf;
|
| 888 | va_list args;
|
| 889 |
|
| 890 | BUG_ON(!descriptor);
|
| 891 | BUG_ON(!fmt);
|
| 892 |
|
| 893 | va_start(args, fmt);
|
| 894 |
|
| 895 | vaf.fmt = fmt;
|
| 896 | vaf.va = &args;
|
| 897 |
|
| 898 | if (!dev) {
|
| 899 | printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
|
| 900 | } else {
|
| 901 | char buf[PREFIX_SIZE] = "";
|
| 902 |
|
| 903 | dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
|
| 904 | dynamic_emit_prefix(descriptor, buf),
|
| 905 | dev_driver_string(dev), dev_name(dev),
|
| 906 | &vaf);
|
| 907 | }
|
| 908 |
|
| 909 | va_end(args);
|
| 910 | }
|
| 911 | EXPORT_SYMBOL(__dynamic_dev_dbg);
|
| 912 |
|
| 913 | #ifdef CONFIG_NET
|
| 914 |
|
| 915 | void __dynamic_netdev_dbg(struct _ddebug *descriptor,
|
| 916 | const struct net_device *dev, const char *fmt, ...)
|
| 917 | {
|
| 918 | struct va_format vaf;
|
| 919 | va_list args;
|
| 920 |
|
| 921 | BUG_ON(!descriptor);
|
| 922 | BUG_ON(!fmt);
|
| 923 |
|
| 924 | va_start(args, fmt);
|
| 925 |
|
| 926 | vaf.fmt = fmt;
|
| 927 | vaf.va = &args;
|
| 928 |
|
| 929 | if (dev && dev->dev.parent) {
|
| 930 | char buf[PREFIX_SIZE] = "";
|
| 931 |
|
| 932 | dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
|
| 933 | "%s%s %s %s%s: %pV",
|
| 934 | dynamic_emit_prefix(descriptor, buf),
|
| 935 | dev_driver_string(dev->dev.parent),
|
| 936 | dev_name(dev->dev.parent),
|
| 937 | netdev_name(dev), netdev_reg_state(dev),
|
| 938 | &vaf);
|
| 939 | } else if (dev) {
|
| 940 | printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
|
| 941 | netdev_reg_state(dev), &vaf);
|
| 942 | } else {
|
| 943 | printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
|
| 944 | }
|
| 945 |
|
| 946 | va_end(args);
|
| 947 | }
|
| 948 | EXPORT_SYMBOL(__dynamic_netdev_dbg);
|
| 949 |
|
| 950 | #endif
|
| 951 |
|
| 952 | #if IS_ENABLED(CONFIG_INFINIBAND)
|
| 953 |
|
| 954 | void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
|
| 955 | const struct ib_device *ibdev, const char *fmt, ...)
|
| 956 | {
|
| 957 | struct va_format vaf;
|
| 958 | va_list args;
|
| 959 |
|
| 960 | va_start(args, fmt);
|
| 961 |
|
| 962 | vaf.fmt = fmt;
|
| 963 | vaf.va = &args;
|
| 964 |
|
| 965 | if (ibdev && ibdev->dev.parent) {
|
| 966 | char buf[PREFIX_SIZE] = "";
|
| 967 |
|
| 968 | dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent,
|
| 969 | "%s%s %s %s: %pV",
|
| 970 | dynamic_emit_prefix(descriptor, buf),
|
| 971 | dev_driver_string(ibdev->dev.parent),
|
| 972 | dev_name(ibdev->dev.parent),
|
| 973 | dev_name(&ibdev->dev),
|
| 974 | &vaf);
|
| 975 | } else if (ibdev) {
|
| 976 | printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf);
|
| 977 | } else {
|
| 978 | printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf);
|
| 979 | }
|
| 980 |
|
| 981 | va_end(args);
|
| 982 | }
|
| 983 | EXPORT_SYMBOL(__dynamic_ibdev_dbg);
|
| 984 |
|
| 985 | #endif
|
| 986 |
|
| 987 | |
| 988 | * Install a noop handler to make dyndbg look like a normal kernel cli param.
|
| 989 | * This avoids warnings about dyndbg being an unknown cli param when supplied
|
| 990 | * by a user.
|
| 991 |
|
| 992 | static __init int dyndbg_setup(char *str)
|
| 993 | {
|
| 994 | return 1;
|
| 995 | }
|
| 996 |
|
| 997 | __setup("dyndbg=", dyndbg_setup);
|
| 998 |
|
| 999 | |
| 1000 | * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
|
| 1001 | * command text from userspace, parses and executes it.
|
| 1002 |
|
| 1003 | #define USER_BUF_PAGE 4096
|
| 1004 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
|
| 1005 | size_t len, loff_t *offp)
|
| 1006 | {
|
| 1007 | char *tmpbuf;
|
| 1008 | int ret;
|
| 1009 |
|
| 1010 | if (len == 0)
|
| 1011 | return 0;
|
| 1012 | if (len > USER_BUF_PAGE - 1) {
|
| 1013 | pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
|
| 1014 | return -E2BIG;
|
| 1015 | }
|
| 1016 | tmpbuf = memdup_user_nul(ubuf, len);
|
| 1017 | if (IS_ERR(tmpbuf))
|
| 1018 | return PTR_ERR(tmpbuf);
|
| 1019 | v2pr_info("read %zu bytes from userspace\n", len);
|
| 1020 |
|
| 1021 | ret = ddebug_exec_queries(tmpbuf, NULL);
|
| 1022 | kfree(tmpbuf);
|
| 1023 | if (ret < 0)
|
| 1024 | return ret;
|
| 1025 |
|
| 1026 | *offp += len;
|
| 1027 | return len;
|
| 1028 | }
|
| 1029 |
|
| 1030 | |
| 1031 | * Set the iterator to point to the first _ddebug object
|
| 1032 | * and return a pointer to that first object. Returns
|
| 1033 | * NULL if there are no _ddebugs at all.
|
| 1034 |
|
| 1035 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
|
| 1036 | {
|
| 1037 | if (list_empty(&ddebug_tables)) {
|
| 1038 | iter->table = NULL;
|
| 1039 | return NULL;
|
| 1040 | }
|
| 1041 | iter->table = list_entry(ddebug_tables.next,
|
| 1042 | struct ddebug_table, link);
|
| 1043 | iter->idx = iter->table->num_ddebugs;
|
| 1044 | return &iter->table->ddebugs[--iter->idx];
|
| 1045 | }
|
| 1046 |
|
| 1047 | |
| 1048 | * Advance the iterator to point to the next _ddebug
|
| 1049 | * object from the one the iterator currently points at,
|
| 1050 | * and returns a pointer to the new _ddebug. Returns
|
| 1051 | * NULL if the iterator has seen all the _ddebugs.
|
| 1052 |
|
| 1053 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
|
| 1054 | {
|
| 1055 | if (iter->table == NULL)
|
| 1056 | return NULL;
|
| 1057 | if (--iter->idx < 0) {
|
| 1058 |
|
| 1059 | if (list_is_last(&iter->table->link, &ddebug_tables)) {
|
| 1060 | iter->table = NULL;
|
| 1061 | return NULL;
|
| 1062 | }
|
| 1063 | iter->table = list_entry(iter->table->link.next,
|
| 1064 | struct ddebug_table, link);
|
| 1065 | iter->idx = iter->table->num_ddebugs;
|
| 1066 | --iter->idx;
|
| 1067 | }
|
| 1068 | return &iter->table->ddebugs[iter->idx];
|
| 1069 | }
|
| 1070 |
|
| 1071 | |
| 1072 | * Seq_ops start method. Called at the start of every
|
| 1073 | * read() call from userspace. Takes the ddebug_lock and
|
| 1074 | * seeks the seq_file's iterator to the given position.
|
| 1075 |
|
| 1076 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
|
| 1077 | {
|
| 1078 | struct ddebug_iter *iter = m->private;
|
| 1079 | struct _ddebug *dp;
|
| 1080 | int n = *pos;
|
| 1081 |
|
| 1082 | mutex_lock(&ddebug_lock);
|
| 1083 |
|
| 1084 | if (!n)
|
| 1085 | return SEQ_START_TOKEN;
|
| 1086 | if (n < 0)
|
| 1087 | return NULL;
|
| 1088 | dp = ddebug_iter_first(iter);
|
| 1089 | while (dp != NULL && --n > 0)
|
| 1090 | dp = ddebug_iter_next(iter);
|
| 1091 | return dp;
|
| 1092 | }
|
| 1093 |
|
| 1094 | |
| 1095 | * Seq_ops next method. Called several times within a read()
|
| 1096 | * call from userspace, with ddebug_lock held. Walks to the
|
| 1097 | * next _ddebug object with a special case for the header line.
|
| 1098 |
|
| 1099 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
|
| 1100 | {
|
| 1101 | struct ddebug_iter *iter = m->private;
|
| 1102 | struct _ddebug *dp;
|
| 1103 |
|
| 1104 | if (p == SEQ_START_TOKEN)
|
| 1105 | dp = ddebug_iter_first(iter);
|
| 1106 | else
|
| 1107 | dp = ddebug_iter_next(iter);
|
| 1108 | ++*pos;
|
| 1109 | return dp;
|
| 1110 | }
|
| 1111 |
|
| 1112 | #define class_in_range(class_id, map) \
|
| 1113 | (class_id >= map->base && class_id < map->base + map->length)
|
| 1114 |
|
| 1115 | static const char *ddebug_class_name(struct ddebug_iter *iter, struct _ddebug *dp)
|
| 1116 | {
|
| 1117 | struct ddebug_class_map *map;
|
| 1118 |
|
| 1119 | list_for_each_entry(map, &iter->table->maps, link)
|
| 1120 | if (class_in_range(dp->class_id, map))
|
| 1121 | return map->class_names[dp->class_id - map->base];
|
| 1122 |
|
| 1123 | return NULL;
|
| 1124 | }
|
| 1125 |
|
| 1126 | |
| 1127 | * Seq_ops show method. Called several times within a read()
|
| 1128 | * call from userspace, with ddebug_lock held. Formats the
|
| 1129 | * current _ddebug as a single human-readable line, with a
|
| 1130 | * special case for the header line.
|
| 1131 |
|
| 1132 | static int ddebug_proc_show(struct seq_file *m, void *p)
|
| 1133 | {
|
| 1134 | struct ddebug_iter *iter = m->private;
|
| 1135 | struct _ddebug *dp = p;
|
| 1136 | struct flagsbuf flags;
|
| 1137 | char const *class;
|
| 1138 |
|
| 1139 | if (p == SEQ_START_TOKEN) {
|
| 1140 | seq_puts(m,
|
| 1141 | "# filename:lineno [module]function flags format\n");
|
| 1142 | return 0;
|
| 1143 | }
|
| 1144 |
|
| 1145 | seq_printf(m, "%s:%u [%s]%s =%s \"",
|
| 1146 | trim_prefix(dp->filename), dp->lineno,
|
| 1147 | iter->table->mod_name, dp->function,
|
| 1148 | ddebug_describe_flags(dp->flags, &flags));
|
| 1149 | seq_escape_str(m, dp->format, ESCAPE_SPACE, "\t\r\n\"");
|
| 1150 | seq_puts(m, "\"");
|
| 1151 |
|
| 1152 | if (dp->class_id != _DPRINTK_CLASS_DFLT) {
|
| 1153 | class = ddebug_class_name(iter, dp);
|
| 1154 | if (class)
|
| 1155 | seq_printf(m, " class:%s", class);
|
| 1156 | else
|
| 1157 | seq_printf(m, " class unknown, _id:%d", dp->class_id);
|
| 1158 | }
|
| 1159 | seq_puts(m, "\n");
|
| 1160 |
|
| 1161 | return 0;
|
| 1162 | }
|
| 1163 |
|
| 1164 | |
| 1165 | * Seq_ops stop method. Called at the end of each read()
|
| 1166 | * call from userspace. Drops ddebug_lock.
|
| 1167 |
|
| 1168 | static void ddebug_proc_stop(struct seq_file *m, void *p)
|
| 1169 | {
|
| 1170 | mutex_unlock(&ddebug_lock);
|
| 1171 | }
|
| 1172 |
|
| 1173 | static const struct seq_operations ddebug_proc_seqops = {
|
| 1174 | .start = ddebug_proc_start,
|
| 1175 | .next = ddebug_proc_next,
|
| 1176 | .show = ddebug_proc_show,
|
| 1177 | .stop = ddebug_proc_stop
|
| 1178 | };
|
| 1179 |
|
| 1180 | static int ddebug_proc_open(struct inode *inode, struct file *file)
|
| 1181 | {
|
| 1182 | return seq_open_private(file, &ddebug_proc_seqops,
|
| 1183 | sizeof(struct ddebug_iter));
|
| 1184 | }
|
| 1185 |
|
| 1186 | static const struct file_operations ddebug_proc_fops = {
|
| 1187 | .owner = THIS_MODULE,
|
| 1188 | .open = ddebug_proc_open,
|
| 1189 | .read = seq_read,
|
| 1190 | .llseek = seq_lseek,
|
| 1191 | .release = seq_release_private,
|
| 1192 | .write = ddebug_proc_write
|
| 1193 | };
|
| 1194 |
|
| 1195 | static const struct proc_ops proc_fops = {
|
| 1196 | .proc_open = ddebug_proc_open,
|
| 1197 | .proc_read = seq_read,
|
| 1198 | .proc_lseek = seq_lseek,
|
| 1199 | .proc_release = seq_release_private,
|
| 1200 | .proc_write = ddebug_proc_write
|
| 1201 | };
|
| 1202 |
|
| 1203 | static void ddebug_attach_module_classes(struct ddebug_table *dt,
|
| 1204 | struct ddebug_class_map *classes,
|
| 1205 | int num_classes)
|
| 1206 | {
|
| 1207 | struct ddebug_class_map *cm;
|
| 1208 | int i, j, ct = 0;
|
| 1209 |
|
| 1210 | for (cm = classes, i = 0; i < num_classes; i++, cm++) {
|
| 1211 |
|
| 1212 | if (!strcmp(cm->mod_name, dt->mod_name)) {
|
| 1213 |
|
| 1214 | v2pr_info("class[%d]: module:%s base:%d len:%d ty:%d\n", i,
|
| 1215 | cm->mod_name, cm->base, cm->length, cm->map_type);
|
| 1216 |
|
| 1217 | for (j = 0; j < cm->length; j++)
|
| 1218 | v3pr_info(" %d: %d %s\n", j + cm->base, j,
|
| 1219 | cm->class_names[j]);
|
| 1220 |
|
| 1221 | list_add(&cm->link, &dt->maps);
|
| 1222 | ct++;
|
| 1223 | }
|
| 1224 | }
|
| 1225 | if (ct)
|
| 1226 | vpr_info("module:%s attached %d classes\n", dt->mod_name, ct);
|
| 1227 | }
|
| 1228 |
|
| 1229 | |
| 1230 | * Allocate a new ddebug_table for the given module
|
| 1231 | * and add it to the global list.
|
| 1232 |
|
| 1233 | static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
|
| 1234 | {
|
| 1235 | struct ddebug_table *dt;
|
| 1236 |
|
| 1237 | v3pr_info("add-module: %s.%d sites\n", modname, di->num_descs);
|
| 1238 | if (!di->num_descs) {
|
| 1239 | v3pr_info(" skip %s\n", modname);
|
| 1240 | return 0;
|
| 1241 | }
|
| 1242 |
|
| 1243 | dt = kzalloc(sizeof(*dt), GFP_KERNEL);
|
| 1244 | if (dt == NULL) {
|
| 1245 | pr_err("error adding module: %s\n", modname);
|
| 1246 | return -ENOMEM;
|
| 1247 | }
|
| 1248 | |
| 1249 | * For built-in modules, name lives in .rodata and is
|
| 1250 | * immortal. For loaded modules, name points at the name[]
|
| 1251 | * member of struct module, which lives at least as long as
|
| 1252 | * this struct ddebug_table.
|
| 1253 |
|
| 1254 | dt->mod_name = modname;
|
| 1255 | dt->ddebugs = di->descs;
|
| 1256 | dt->num_ddebugs = di->num_descs;
|
| 1257 |
|
| 1258 | INIT_LIST_HEAD(&dt->link);
|
| 1259 | INIT_LIST_HEAD(&dt->maps);
|
| 1260 |
|
| 1261 | if (di->classes && di->num_classes)
|
| 1262 | ddebug_attach_module_classes(dt, di->classes, di->num_classes);
|
| 1263 |
|
| 1264 | mutex_lock(&ddebug_lock);
|
| 1265 | list_add_tail(&dt->link, &ddebug_tables);
|
| 1266 | mutex_unlock(&ddebug_lock);
|
| 1267 |
|
| 1268 | vpr_info("%3u debug prints in module %s\n", di->num_descs, modname);
|
| 1269 | return 0;
|
| 1270 | }
|
| 1271 |
|
| 1272 |
|
| 1273 | static int ddebug_dyndbg_param_cb(char *param, char *val,
|
| 1274 | const char *modname, int on_err)
|
| 1275 | {
|
| 1276 | char *sep;
|
| 1277 |
|
| 1278 | sep = strchr(param, '.');
|
| 1279 | if (sep) {
|
| 1280 |
|
| 1281 | *sep = '\0';
|
| 1282 | modname = param;
|
| 1283 | param = sep + 1;
|
| 1284 | }
|
| 1285 | if (strcmp(param, "dyndbg"))
|
| 1286 | return on_err;
|
| 1287 |
|
| 1288 | ddebug_exec_queries((val ? val : "+p"), modname);
|
| 1289 |
|
| 1290 | return 0;
|
| 1291 | }
|
| 1292 |
|
| 1293 |
|
| 1294 | static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
|
| 1295 | const char *unused, void *arg)
|
| 1296 | {
|
| 1297 | vpr_info("%s=\"%s\"\n", param, val);
|
| 1298 | return ddebug_dyndbg_param_cb(param, val, NULL, 0);
|
| 1299 | }
|
| 1300 |
|
| 1301 | |
| 1302 | * modprobe foo finds foo.params in boot-args, strips "foo.", and
|
| 1303 | * passes them to load_module(). This callback gets unknown params,
|
| 1304 | * processes dyndbg params, rejects others.
|
| 1305 |
|
| 1306 | int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
|
| 1307 | {
|
| 1308 | vpr_info("module: %s %s=\"%s\"\n", module, param, val);
|
| 1309 | return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
|
| 1310 | }
|
| 1311 |
|
| 1312 | static void ddebug_table_free(struct ddebug_table *dt)
|
| 1313 | {
|
| 1314 | list_del_init(&dt->link);
|
| 1315 | kfree(dt);
|
| 1316 | }
|
| 1317 |
|
| 1318 | #ifdef CONFIG_MODULES
|
| 1319 |
|
| 1320 | |
| 1321 | * Called in response to a module being unloaded. Removes
|
| 1322 | * any ddebug_table's which point at the module.
|
| 1323 |
|
| 1324 | static int ddebug_remove_module(const char *mod_name)
|
| 1325 | {
|
| 1326 | struct ddebug_table *dt, *nextdt;
|
| 1327 | int ret = -ENOENT;
|
| 1328 |
|
| 1329 | mutex_lock(&ddebug_lock);
|
| 1330 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
|
| 1331 | if (dt->mod_name == mod_name) {
|
| 1332 | ddebug_table_free(dt);
|
| 1333 | ret = 0;
|
| 1334 | break;
|
| 1335 | }
|
| 1336 | }
|
| 1337 | mutex_unlock(&ddebug_lock);
|
| 1338 | if (!ret)
|
| 1339 | v2pr_info("removed module \"%s\"\n", mod_name);
|
| 1340 | return ret;
|
| 1341 | }
|
| 1342 |
|
| 1343 | static int ddebug_module_notify(struct notifier_block *self, unsigned long val,
|
| 1344 | void *data)
|
| 1345 | {
|
| 1346 | struct module *mod = data;
|
| 1347 | int ret = 0;
|
| 1348 |
|
| 1349 | switch (val) {
|
| 1350 | case MODULE_STATE_COMING:
|
| 1351 | ret = ddebug_add_module(&mod->dyndbg_info, mod->name);
|
| 1352 | if (ret)
|
| 1353 | WARN(1, "Failed to allocate memory: dyndbg may not work properly.\n");
|
| 1354 | break;
|
| 1355 | case MODULE_STATE_GOING:
|
| 1356 | ddebug_remove_module(mod->name);
|
| 1357 | break;
|
| 1358 | }
|
| 1359 |
|
| 1360 | return notifier_from_errno(ret);
|
| 1361 | }
|
| 1362 |
|
| 1363 | static struct notifier_block ddebug_module_nb = {
|
| 1364 | .notifier_call = ddebug_module_notify,
|
| 1365 | .priority = 0,
|
| 1366 | };
|
| 1367 |
|
| 1368 | #endif
|
| 1369 |
|
| 1370 | static void ddebug_remove_all_tables(void)
|
| 1371 | {
|
| 1372 | mutex_lock(&ddebug_lock);
|
| 1373 | while (!list_empty(&ddebug_tables)) {
|
| 1374 | struct ddebug_table *dt = list_entry(ddebug_tables.next,
|
| 1375 | struct ddebug_table,
|
| 1376 | link);
|
| 1377 | ddebug_table_free(dt);
|
| 1378 | }
|
| 1379 | mutex_unlock(&ddebug_lock);
|
| 1380 | }
|
| 1381 |
|
| 1382 | static __initdata int ddebug_init_success;
|
| 1383 |
|
| 1384 | static int __init dynamic_debug_init_control(void)
|
| 1385 | {
|
| 1386 | struct proc_dir_entry *procfs_dir;
|
| 1387 | struct dentry *debugfs_dir;
|
| 1388 |
|
| 1389 | if (!ddebug_init_success)
|
| 1390 | return -ENODEV;
|
| 1391 |
|
| 1392 |
|
| 1393 | if (debugfs_initialized()) {
|
| 1394 | debugfs_dir = debugfs_create_dir("dynamic_debug", NULL);
|
| 1395 | debugfs_create_file("control", 0644, debugfs_dir, NULL,
|
| 1396 | &ddebug_proc_fops);
|
| 1397 | }
|
| 1398 |
|
| 1399 |
|
| 1400 | procfs_dir = proc_mkdir("dynamic_debug", NULL);
|
| 1401 | if (procfs_dir)
|
| 1402 | proc_create("control", 0644, procfs_dir, &proc_fops);
|
| 1403 |
|
| 1404 | return 0;
|
| 1405 | }
|
| 1406 |
|
| 1407 | static int __init dynamic_debug_init(void)
|
| 1408 | {
|
| 1409 | struct _ddebug *iter, *iter_mod_start;
|
| 1410 | int ret, i, mod_sites, mod_ct;
|
| 1411 | const char *modname;
|
| 1412 | char *cmdline;
|
| 1413 |
|
| 1414 | struct _ddebug_info di = {
|
| 1415 | .descs = __start___dyndbg,
|
| 1416 | .classes = __start___dyndbg_classes,
|
| 1417 | .num_descs = __stop___dyndbg - __start___dyndbg,
|
| 1418 | .num_classes = __stop___dyndbg_classes - __start___dyndbg_classes,
|
| 1419 | };
|
| 1420 |
|
| 1421 | #ifdef CONFIG_MODULES
|
| 1422 | ret = register_module_notifier(&ddebug_module_nb);
|
| 1423 | if (ret) {
|
| 1424 | pr_warn("Failed to register dynamic debug module notifier\n");
|
| 1425 | return ret;
|
| 1426 | }
|
| 1427 | #endif
|
| 1428 |
|
| 1429 | if (&__start___dyndbg == &__stop___dyndbg) {
|
| 1430 | if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) {
|
| 1431 | pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
|
| 1432 | return 1;
|
| 1433 | }
|
| 1434 | pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build\n");
|
| 1435 | ddebug_init_success = 1;
|
| 1436 | return 0;
|
| 1437 | }
|
| 1438 |
|
| 1439 | iter = iter_mod_start = __start___dyndbg;
|
| 1440 | modname = iter->modname;
|
| 1441 | i = mod_sites = mod_ct = 0;
|
| 1442 |
|
| 1443 | for (; iter < __stop___dyndbg; iter++, i++, mod_sites++) {
|
| 1444 |
|
| 1445 | if (strcmp(modname, iter->modname)) {
|
| 1446 | mod_ct++;
|
| 1447 | di.num_descs = mod_sites;
|
| 1448 | di.descs = iter_mod_start;
|
| 1449 | ret = ddebug_add_module(&di, modname);
|
| 1450 | if (ret)
|
| 1451 | goto out_err;
|
| 1452 |
|
| 1453 | mod_sites = 0;
|
| 1454 | modname = iter->modname;
|
| 1455 | iter_mod_start = iter;
|
| 1456 | }
|
| 1457 | }
|
| 1458 | di.num_descs = mod_sites;
|
| 1459 | di.descs = iter_mod_start;
|
| 1460 | ret = ddebug_add_module(&di, modname);
|
| 1461 | if (ret)
|
| 1462 | goto out_err;
|
| 1463 |
|
| 1464 | ddebug_init_success = 1;
|
| 1465 | vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg section\n",
|
| 1466 | i, mod_ct, (int)((mod_ct * sizeof(struct ddebug_table)) >> 10),
|
| 1467 | (int)((i * sizeof(struct _ddebug)) >> 10));
|
| 1468 |
|
| 1469 | if (di.num_classes)
|
| 1470 | v2pr_info(" %d builtin ddebug class-maps\n", di.num_classes);
|
| 1471 |
|
| 1472 | |
| 1473 | * again to find and activate queries given in dyndbg params.
|
| 1474 | * While this has already been done for known boot params, it
|
| 1475 | * ignored the unknown ones (dyndbg in particular). Reusing
|
| 1476 | * parse_args avoids ad-hoc parsing. This will also attempt
|
| 1477 | * to activate queries for not-yet-loaded modules, which is
|
| 1478 | * slightly noisy if verbose, but harmless.
|
| 1479 |
|
| 1480 | cmdline = kstrdup(saved_command_line, GFP_KERNEL);
|
| 1481 | parse_args("dyndbg params", cmdline, NULL,
|
| 1482 | 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
|
| 1483 | kfree(cmdline);
|
| 1484 | return 0;
|
| 1485 |
|
| 1486 | out_err:
|
| 1487 | ddebug_remove_all_tables();
|
| 1488 | return 0;
|
| 1489 | }
|
| 1490 |
|
| 1491 | early_initcall(dynamic_debug_init);
|
| 1492 |
|
| 1493 |
|
| 1494 | fs_initcall(dynamic_debug_init_control);
|