| 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>
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| 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>
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| 35 | #include <linux/hardirq.h>
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| 36 | #include <linux/sched.h>
|
| 37 | #include <linux/device.h>
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| 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 |
|
| 45 | struct ddebug_table {
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| 46 | struct list_head link;
|
| 47 | const char *mod_name;
|
| 48 | unsigned int num_ddebugs;
|
| 49 | struct _ddebug *ddebugs;
|
| 50 | };
|
| 51 |
|
| 52 | struct ddebug_query {
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| 53 | const char *filename;
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| 54 | const char *module;
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| 55 | const char *function;
|
| 56 | const char *format;
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| 57 | unsigned int first_lineno, last_lineno;
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| 58 | };
|
| 59 |
|
| 60 | struct ddebug_iter {
|
| 61 | struct ddebug_table *table;
|
| 62 | unsigned int idx;
|
| 63 | };
|
| 64 |
|
| 65 | struct flag_settings {
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| 66 | unsigned int flags;
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| 67 | unsigned int mask;
|
| 68 | };
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| 69 |
|
| 70 | static DEFINE_MUTEX(ddebug_lock);
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| 71 | static LIST_HEAD(ddebug_tables);
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| 72 | static int verbose;
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| 73 | module_param(verbose, int, 0644);
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| 74 |
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| 75 |
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| 76 | static inline const char *trim_prefix(const char *path)
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| 77 | {
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| 78 | int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c");
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| 79 |
|
| 80 | if (strncmp(path, __FILE__, skip))
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| 81 | skip = 0;
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| 82 |
|
| 83 | return path + skip;
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| 84 | }
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| 85 |
|
| 86 | static struct { unsigned flag:8; char opt_char; } opt_array[] = {
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| 87 | { _DPRINTK_FLAGS_PRINT, 'p' },
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| 88 | { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
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| 89 | { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
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| 90 | { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
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| 91 | { _DPRINTK_FLAGS_INCL_TID, 't' },
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| 92 | { _DPRINTK_FLAGS_NONE, '_' },
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| 93 | };
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| 94 |
|
| 95 | struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; };
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| 96 |
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| 97 |
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| 98 | static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb)
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| 99 | {
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| 100 | char *p = fb->buf;
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| 101 | int i;
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| 102 |
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| 103 | for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
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| 104 | if (flags & opt_array[i].flag)
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| 105 | *p++ = opt_array[i].opt_char;
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| 106 | if (p == fb->buf)
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| 107 | *p++ = '_';
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| 108 | *p = '\0';
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| 109 |
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| 110 | return fb->buf;
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| 111 | }
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| 112 |
|
| 113 | #define vnpr_info(lvl, fmt, ...) \
|
| 114 | do { \
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| 115 | if (verbose >= lvl) \
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| 116 | pr_info(fmt, ##__VA_ARGS__); \
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| 117 | } while (0)
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| 118 |
|
| 119 | #define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__)
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| 120 | #define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__)
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| 121 |
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| 122 | static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
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| 123 | {
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| 124 |
|
| 125 | int fmtlen = 0;
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| 126 |
|
| 127 | if (query->format) {
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| 128 | fmtlen = strlen(query->format);
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| 129 | while (fmtlen && query->format[fmtlen - 1] == '\n')
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| 130 | fmtlen--;
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| 131 | }
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| 132 |
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| 133 | vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u\n",
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| 134 | msg,
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| 135 | query->function ?: "",
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| 136 | query->filename ?: "",
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| 137 | query->module ?: "",
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| 138 | fmtlen, query->format ?: "",
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| 139 | query->first_lineno, query->last_lineno);
|
| 140 | }
|
| 141 |
|
| 142 | |
| 143 | * Search the tables for _ddebug's which match the given `query' and
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| 144 | * apply the `flags' and `mask' to them. Returns number of matching
|
| 145 | * callsites, normally the same as number of changes. If verbose,
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| 146 | * logs the changes. Takes ddebug_lock.
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| 147 |
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| 148 | static int ddebug_change(const struct ddebug_query *query,
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| 149 | struct flag_settings *modifiers)
|
| 150 | {
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| 151 | int i;
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| 152 | struct ddebug_table *dt;
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| 153 | unsigned int newflags;
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| 154 | unsigned int nfound = 0;
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| 155 | struct flagsbuf fbuf;
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| 156 |
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| 157 |
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| 158 | mutex_lock(&ddebug_lock);
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| 159 | list_for_each_entry(dt, &ddebug_tables, link) {
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| 160 |
|
| 161 |
|
| 162 | if (query->module &&
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| 163 | !match_wildcard(query->module, dt->mod_name))
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| 164 | continue;
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| 165 |
|
| 166 | for (i = 0; i < dt->num_ddebugs; i++) {
|
| 167 | struct _ddebug *dp = &dt->ddebugs[i];
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| 168 |
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| 169 |
|
| 170 | if (query->filename &&
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| 171 | !match_wildcard(query->filename, dp->filename) &&
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| 172 | !match_wildcard(query->filename,
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| 173 | kbasename(dp->filename)) &&
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| 174 | !match_wildcard(query->filename,
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| 175 | trim_prefix(dp->filename)))
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| 176 | continue;
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| 177 |
|
| 178 |
|
| 179 | if (query->function &&
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| 180 | !match_wildcard(query->function, dp->function))
|
| 181 | continue;
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| 182 |
|
| 183 |
|
| 184 | if (query->format) {
|
| 185 | if (*query->format == '^') {
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| 186 | char *p;
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| 187 |
|
| 188 | p = strstr(dp->format, query->format+1);
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| 189 | if (p != dp->format)
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| 190 | continue;
|
| 191 | } else if (!strstr(dp->format, query->format))
|
| 192 | continue;
|
| 193 | }
|
| 194 |
|
| 195 |
|
| 196 | if (query->first_lineno &&
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| 197 | dp->lineno < query->first_lineno)
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| 198 | continue;
|
| 199 | if (query->last_lineno &&
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| 200 | dp->lineno > query->last_lineno)
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| 201 | continue;
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| 202 |
|
| 203 | nfound++;
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| 204 |
|
| 205 | newflags = (dp->flags & modifiers->mask) | modifiers->flags;
|
| 206 | if (newflags == dp->flags)
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| 207 | continue;
|
| 208 | #ifdef CONFIG_JUMP_LABEL
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| 209 | if (dp->flags & _DPRINTK_FLAGS_PRINT) {
|
| 210 | if (!(modifiers->flags & _DPRINTK_FLAGS_PRINT))
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| 211 | static_branch_disable(&dp->key.dd_key_true);
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| 212 | } else if (modifiers->flags & _DPRINTK_FLAGS_PRINT)
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| 213 | static_branch_enable(&dp->key.dd_key_true);
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| 214 | #endif
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| 215 | dp->flags = newflags;
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| 216 | v2pr_info("changed %s:%d [%s]%s =%s\n",
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| 217 | trim_prefix(dp->filename), dp->lineno,
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| 218 | dt->mod_name, dp->function,
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| 219 | ddebug_describe_flags(dp->flags, &fbuf));
|
| 220 | }
|
| 221 | }
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| 222 | mutex_unlock(&ddebug_lock);
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| 223 |
|
| 224 | if (!nfound && verbose)
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| 225 | pr_info("no matches for query\n");
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| 226 |
|
| 227 | return nfound;
|
| 228 | }
|
| 229 |
|
| 230 | |
| 231 | * Split the buffer `buf' into space-separated words.
|
| 232 | * Handles simple " and ' quoting, i.e. without nested,
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| 233 | * embedded or escaped \". Return the number of words
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| 234 | * or <0 on error.
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| 235 |
|
| 236 | static int ddebug_tokenize(char *buf, char *words[], int maxwords)
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| 237 | {
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| 238 | int nwords = 0;
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| 239 |
|
| 240 | while (*buf) {
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| 241 | char *end;
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| 242 |
|
| 243 |
|
| 244 | buf = skip_spaces(buf);
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| 245 | if (!*buf)
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| 246 | break;
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| 247 | if (*buf == '#')
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| 248 | break;
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| 249 |
|
| 250 |
|
| 251 | if (*buf == '"' || *buf == '\'') {
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| 252 | int quote = *buf++;
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| 253 | for (end = buf; *end && *end != quote; end++)
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| 254 | ;
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| 255 | if (!*end) {
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| 256 | pr_err("unclosed quote: %s\n", buf);
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| 257 | return -EINVAL;
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| 258 | }
|
| 259 | } else {
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| 260 | for (end = buf; *end && !isspace(*end); end++)
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| 261 | ;
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| 262 | BUG_ON(end == buf);
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| 263 | }
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| 264 |
|
| 265 |
|
| 266 | if (nwords == maxwords) {
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| 267 | pr_err("too many words, legal max <=%d\n", maxwords);
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| 268 | return -EINVAL;
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| 269 | }
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| 270 | if (*end)
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| 271 | *end++ = '\0';
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| 272 | words[nwords++] = buf;
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| 273 | buf = end;
|
| 274 | }
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| 275 |
|
| 276 | if (verbose) {
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| 277 | int i;
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| 278 | pr_info("split into words:");
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| 279 | for (i = 0; i < nwords; i++)
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| 280 | pr_cont(" \"%s\"", words[i]);
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| 281 | pr_cont("\n");
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| 282 | }
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| 283 |
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| 284 | return nwords;
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| 285 | }
|
| 286 |
|
| 287 | |
| 288 | * Parse a single line number. Note that the empty string ""
|
| 289 | * is treated as a special case and converted to zero, which
|
| 290 | * is later treated as a "don't care" value.
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| 291 |
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| 292 | static inline int parse_lineno(const char *str, unsigned int *val)
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| 293 | {
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| 294 | BUG_ON(str == NULL);
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| 295 | if (*str == '\0') {
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| 296 | *val = 0;
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| 297 | return 0;
|
| 298 | }
|
| 299 | if (kstrtouint(str, 10, val) < 0) {
|
| 300 | pr_err("bad line-number: %s\n", str);
|
| 301 | return -EINVAL;
|
| 302 | }
|
| 303 | return 0;
|
| 304 | }
|
| 305 |
|
| 306 | static int parse_linerange(struct ddebug_query *query, const char *first)
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| 307 | {
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| 308 | char *last = strchr(first, '-');
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| 309 |
|
| 310 | if (query->first_lineno || query->last_lineno) {
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| 311 | pr_err("match-spec: line used 2x\n");
|
| 312 | return -EINVAL;
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| 313 | }
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| 314 | if (last)
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| 315 | *last++ = '\0';
|
| 316 | if (parse_lineno(first, &query->first_lineno) < 0)
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| 317 | return -EINVAL;
|
| 318 | if (last) {
|
| 319 |
|
| 320 | if (parse_lineno(last, &query->last_lineno) < 0)
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| 321 | return -EINVAL;
|
| 322 |
|
| 323 |
|
| 324 | if (query->last_lineno == 0)
|
| 325 | query->last_lineno = UINT_MAX;
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| 326 |
|
| 327 | if (query->last_lineno < query->first_lineno) {
|
| 328 | pr_err("last-line:%d < 1st-line:%d\n",
|
| 329 | query->last_lineno,
|
| 330 | query->first_lineno);
|
| 331 | return -EINVAL;
|
| 332 | }
|
| 333 | } else {
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| 334 | query->last_lineno = query->first_lineno;
|
| 335 | }
|
| 336 | vpr_info("parsed line %d-%d\n", query->first_lineno,
|
| 337 | query->last_lineno);
|
| 338 | return 0;
|
| 339 | }
|
| 340 |
|
| 341 | static int check_set(const char **dest, char *src, char *name)
|
| 342 | {
|
| 343 | int rc = 0;
|
| 344 |
|
| 345 | if (*dest) {
|
| 346 | rc = -EINVAL;
|
| 347 | pr_err("match-spec:%s val:%s overridden by %s\n",
|
| 348 | name, *dest, src);
|
| 349 | }
|
| 350 | *dest = src;
|
| 351 | return rc;
|
| 352 | }
|
| 353 |
|
| 354 | |
| 355 | * Parse words[] as a ddebug query specification, which is a series
|
| 356 | * of (keyword, value) pairs chosen from these possibilities:
|
| 357 | *
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| 358 | * func <function-name>
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| 359 | * file <full-pathname>
|
| 360 | * file <base-filename>
|
| 361 | * module <module-name>
|
| 362 | * format <escaped-string-to-find-in-format>
|
| 363 | * line <lineno>
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| 364 | * line <first-lineno>-<last-lineno> // where either may be empty
|
| 365 | *
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| 366 | * Only 1 of each type is allowed.
|
| 367 | * Returns 0 on success, <0 on error.
|
| 368 |
|
| 369 | static int ddebug_parse_query(char *words[], int nwords,
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| 370 | struct ddebug_query *query, const char *modname)
|
| 371 | {
|
| 372 | unsigned int i;
|
| 373 | int rc = 0;
|
| 374 | char *fline;
|
| 375 |
|
| 376 |
|
| 377 | if (nwords % 2 != 0) {
|
| 378 | pr_err("expecting pairs of match-spec <value>\n");
|
| 379 | return -EINVAL;
|
| 380 | }
|
| 381 |
|
| 382 | if (modname)
|
| 383 |
|
| 384 | query->module = modname;
|
| 385 |
|
| 386 | for (i = 0; i < nwords; i += 2) {
|
| 387 | char *keyword = words[i];
|
| 388 | char *arg = words[i+1];
|
| 389 |
|
| 390 | if (!strcmp(keyword, "func")) {
|
| 391 | rc = check_set(&query->function, arg, "func");
|
| 392 | } else if (!strcmp(keyword, "file")) {
|
| 393 | if (check_set(&query->filename, arg, "file"))
|
| 394 | return -EINVAL;
|
| 395 |
|
| 396 |
|
| 397 | fline = strchr(query->filename, ':');
|
| 398 | if (!fline)
|
| 399 | continue;
|
| 400 | *fline++ = '\0';
|
| 401 | if (isalpha(*fline) || *fline == '*' || *fline == '?') {
|
| 402 |
|
| 403 | if (check_set(&query->function, fline, "func"))
|
| 404 | return -EINVAL;
|
| 405 | } else {
|
| 406 | if (parse_linerange(query, fline))
|
| 407 | return -EINVAL;
|
| 408 | }
|
| 409 | } else if (!strcmp(keyword, "module")) {
|
| 410 | rc = check_set(&query->module, arg, "module");
|
| 411 | } else if (!strcmp(keyword, "format")) {
|
| 412 | string_unescape_inplace(arg, UNESCAPE_SPACE |
|
| 413 | UNESCAPE_OCTAL |
|
| 414 | UNESCAPE_SPECIAL);
|
| 415 | rc = check_set(&query->format, arg, "format");
|
| 416 | } else if (!strcmp(keyword, "line")) {
|
| 417 | if (parse_linerange(query, arg))
|
| 418 | return -EINVAL;
|
| 419 | } else {
|
| 420 | pr_err("unknown keyword \"%s\"\n", keyword);
|
| 421 | return -EINVAL;
|
| 422 | }
|
| 423 | if (rc)
|
| 424 | return rc;
|
| 425 | }
|
| 426 | vpr_info_dq(query, "parsed");
|
| 427 | return 0;
|
| 428 | }
|
| 429 |
|
| 430 | |
| 431 | * Parse `str' as a flags specification, format [-+=][p]+.
|
| 432 | * Sets up *maskp and *flagsp to be used when changing the
|
| 433 | * flags fields of matched _ddebug's. Returns 0 on success
|
| 434 | * or <0 on error.
|
| 435 |
|
| 436 | static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
|
| 437 | {
|
| 438 | int op, i;
|
| 439 |
|
| 440 | switch (*str) {
|
| 441 | case '+':
|
| 442 | case '-':
|
| 443 | case '=':
|
| 444 | op = *str++;
|
| 445 | break;
|
| 446 | default:
|
| 447 | pr_err("bad flag-op %c, at start of %s\n", *str, str);
|
| 448 | return -EINVAL;
|
| 449 | }
|
| 450 | vpr_info("op='%c'\n", op);
|
| 451 |
|
| 452 | for (; *str ; ++str) {
|
| 453 | for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
|
| 454 | if (*str == opt_array[i].opt_char) {
|
| 455 | modifiers->flags |= opt_array[i].flag;
|
| 456 | break;
|
| 457 | }
|
| 458 | }
|
| 459 | if (i < 0) {
|
| 460 | pr_err("unknown flag '%c'\n", *str);
|
| 461 | return -EINVAL;
|
| 462 | }
|
| 463 | }
|
| 464 | vpr_info("flags=0x%x\n", modifiers->flags);
|
| 465 |
|
| 466 |
|
| 467 | switch (op) {
|
| 468 | case '=':
|
| 469 |
|
| 470 | modifiers->mask = 0;
|
| 471 | break;
|
| 472 | case '+':
|
| 473 | modifiers->mask = ~0U;
|
| 474 | break;
|
| 475 | case '-':
|
| 476 | modifiers->mask = ~modifiers->flags;
|
| 477 | modifiers->flags = 0;
|
| 478 | break;
|
| 479 | }
|
| 480 | vpr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask);
|
| 481 |
|
| 482 | return 0;
|
| 483 | }
|
| 484 |
|
| 485 | static int ddebug_exec_query(char *query_string, const char *modname)
|
| 486 | {
|
| 487 | struct flag_settings modifiers = {};
|
| 488 | struct ddebug_query query = {};
|
| 489 | #define MAXWORDS 9
|
| 490 | int nwords, nfound;
|
| 491 | char *words[MAXWORDS];
|
| 492 |
|
| 493 | nwords = ddebug_tokenize(query_string, words, MAXWORDS);
|
| 494 | if (nwords <= 0) {
|
| 495 | pr_err("tokenize failed\n");
|
| 496 | return -EINVAL;
|
| 497 | }
|
| 498 |
|
| 499 | if (ddebug_parse_flags(words[nwords-1], &modifiers)) {
|
| 500 | pr_err("flags parse failed\n");
|
| 501 | return -EINVAL;
|
| 502 | }
|
| 503 | if (ddebug_parse_query(words, nwords-1, &query, modname)) {
|
| 504 | pr_err("query parse failed\n");
|
| 505 | return -EINVAL;
|
| 506 | }
|
| 507 |
|
| 508 | nfound = ddebug_change(&query, &modifiers);
|
| 509 | vpr_info_dq(&query, nfound ? "applied" : "no-match");
|
| 510 |
|
| 511 | return nfound;
|
| 512 | }
|
| 513 |
|
| 514 | |
| 515 | last error or number of matching callsites. Module name is either
|
| 516 | in param (for boot arg) or perhaps in query string.
|
| 517 |
|
| 518 | static int ddebug_exec_queries(char *query, const char *modname)
|
| 519 | {
|
| 520 | char *split;
|
| 521 | int i, errs = 0, exitcode = 0, rc, nfound = 0;
|
| 522 |
|
| 523 | for (i = 0; query; query = split) {
|
| 524 | split = strpbrk(query, ";\n");
|
| 525 | if (split)
|
| 526 | *split++ = '\0';
|
| 527 |
|
| 528 | query = skip_spaces(query);
|
| 529 | if (!query || !*query || *query == '#')
|
| 530 | continue;
|
| 531 |
|
| 532 | vpr_info("query %d: \"%s\"\n", i, query);
|
| 533 |
|
| 534 | rc = ddebug_exec_query(query, modname);
|
| 535 | if (rc < 0) {
|
| 536 | errs++;
|
| 537 | exitcode = rc;
|
| 538 | } else {
|
| 539 | nfound += rc;
|
| 540 | }
|
| 541 | i++;
|
| 542 | }
|
| 543 | vpr_info("processed %d queries, with %d matches, %d errs\n",
|
| 544 | i, nfound, errs);
|
| 545 |
|
| 546 | if (exitcode)
|
| 547 | return exitcode;
|
| 548 | return nfound;
|
| 549 | }
|
| 550 |
|
| 551 | |
| 552 | * dynamic_debug_exec_queries - select and change dynamic-debug prints
|
| 553 | * @query: query-string described in admin-guide/dynamic-debug-howto
|
| 554 | * @modname: string containing module name, usually &module.mod_name
|
| 555 | *
|
| 556 | * This uses the >/proc/dynamic_debug/control reader, allowing module
|
| 557 | * authors to modify their dynamic-debug callsites. The modname is
|
| 558 | * canonically struct module.mod_name, but can also be null or a
|
| 559 | * module-wildcard, for example: "drm*".
|
| 560 |
|
| 561 | int dynamic_debug_exec_queries(const char *query, const char *modname)
|
| 562 | {
|
| 563 | int rc;
|
| 564 | char *qry;
|
| 565 |
|
| 566 | if (!query) {
|
| 567 | pr_err("non-null query/command string expected\n");
|
| 568 | return -EINVAL;
|
| 569 | }
|
| 570 | qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
|
| 571 | if (!qry)
|
| 572 | return -ENOMEM;
|
| 573 |
|
| 574 | rc = ddebug_exec_queries(qry, modname);
|
| 575 | kfree(qry);
|
| 576 | return rc;
|
| 577 | }
|
| 578 | EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
|
| 579 |
|
| 580 | #define PREFIX_SIZE 64
|
| 581 |
|
| 582 | static int remaining(int wrote)
|
| 583 | {
|
| 584 | if (PREFIX_SIZE - wrote > 0)
|
| 585 | return PREFIX_SIZE - wrote;
|
| 586 | return 0;
|
| 587 | }
|
| 588 |
|
| 589 | static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
|
| 590 | {
|
| 591 | int pos_after_tid;
|
| 592 | int pos = 0;
|
| 593 |
|
| 594 | if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
|
| 595 | if (in_interrupt())
|
| 596 | pos += snprintf(buf + pos, remaining(pos), "<intr> ");
|
| 597 | else
|
| 598 | pos += snprintf(buf + pos, remaining(pos), "[%d] ",
|
| 599 | task_pid_vnr(current));
|
| 600 | }
|
| 601 | pos_after_tid = pos;
|
| 602 | if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME)
|
| 603 | pos += snprintf(buf + pos, remaining(pos), "%s:",
|
| 604 | desc->modname);
|
| 605 | if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME)
|
| 606 | pos += snprintf(buf + pos, remaining(pos), "%s:",
|
| 607 | desc->function);
|
| 608 | if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
|
| 609 | pos += snprintf(buf + pos, remaining(pos), "%d:",
|
| 610 | desc->lineno);
|
| 611 | if (pos - pos_after_tid)
|
| 612 | pos += snprintf(buf + pos, remaining(pos), " ");
|
| 613 | if (pos >= PREFIX_SIZE)
|
| 614 | buf[PREFIX_SIZE - 1] = '\0';
|
| 615 |
|
| 616 | return buf;
|
| 617 | }
|
| 618 |
|
| 619 | static inline char *dynamic_emit_prefix(struct _ddebug *desc, char *buf)
|
| 620 | {
|
| 621 | if (unlikely(desc->flags & _DPRINTK_FLAGS_INCL_ANY))
|
| 622 | return __dynamic_emit_prefix(desc, buf);
|
| 623 | return buf;
|
| 624 | }
|
| 625 |
|
| 626 | void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
|
| 627 | {
|
| 628 | va_list args;
|
| 629 | struct va_format vaf;
|
| 630 | char buf[PREFIX_SIZE] = "";
|
| 631 |
|
| 632 | BUG_ON(!descriptor);
|
| 633 | BUG_ON(!fmt);
|
| 634 |
|
| 635 | va_start(args, fmt);
|
| 636 |
|
| 637 | vaf.fmt = fmt;
|
| 638 | vaf.va = &args;
|
| 639 |
|
| 640 | printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf);
|
| 641 |
|
| 642 | va_end(args);
|
| 643 | }
|
| 644 | EXPORT_SYMBOL(__dynamic_pr_debug);
|
| 645 |
|
| 646 | void __dynamic_dev_dbg(struct _ddebug *descriptor,
|
| 647 | const struct device *dev, const char *fmt, ...)
|
| 648 | {
|
| 649 | struct va_format vaf;
|
| 650 | va_list args;
|
| 651 |
|
| 652 | BUG_ON(!descriptor);
|
| 653 | BUG_ON(!fmt);
|
| 654 |
|
| 655 | va_start(args, fmt);
|
| 656 |
|
| 657 | vaf.fmt = fmt;
|
| 658 | vaf.va = &args;
|
| 659 |
|
| 660 | if (!dev) {
|
| 661 | printk(KERN_DEBUG "(NULL device *): %pV", &vaf);
|
| 662 | } else {
|
| 663 | char buf[PREFIX_SIZE] = "";
|
| 664 |
|
| 665 | dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV",
|
| 666 | dynamic_emit_prefix(descriptor, buf),
|
| 667 | dev_driver_string(dev), dev_name(dev),
|
| 668 | &vaf);
|
| 669 | }
|
| 670 |
|
| 671 | va_end(args);
|
| 672 | }
|
| 673 | EXPORT_SYMBOL(__dynamic_dev_dbg);
|
| 674 |
|
| 675 | #ifdef CONFIG_NET
|
| 676 |
|
| 677 | void __dynamic_netdev_dbg(struct _ddebug *descriptor,
|
| 678 | const struct net_device *dev, const char *fmt, ...)
|
| 679 | {
|
| 680 | struct va_format vaf;
|
| 681 | va_list args;
|
| 682 |
|
| 683 | BUG_ON(!descriptor);
|
| 684 | BUG_ON(!fmt);
|
| 685 |
|
| 686 | va_start(args, fmt);
|
| 687 |
|
| 688 | vaf.fmt = fmt;
|
| 689 | vaf.va = &args;
|
| 690 |
|
| 691 | if (dev && dev->dev.parent) {
|
| 692 | char buf[PREFIX_SIZE] = "";
|
| 693 |
|
| 694 | dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent,
|
| 695 | "%s%s %s %s%s: %pV",
|
| 696 | dynamic_emit_prefix(descriptor, buf),
|
| 697 | dev_driver_string(dev->dev.parent),
|
| 698 | dev_name(dev->dev.parent),
|
| 699 | netdev_name(dev), netdev_reg_state(dev),
|
| 700 | &vaf);
|
| 701 | } else if (dev) {
|
| 702 | printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev),
|
| 703 | netdev_reg_state(dev), &vaf);
|
| 704 | } else {
|
| 705 | printk(KERN_DEBUG "(NULL net_device): %pV", &vaf);
|
| 706 | }
|
| 707 |
|
| 708 | va_end(args);
|
| 709 | }
|
| 710 | EXPORT_SYMBOL(__dynamic_netdev_dbg);
|
| 711 |
|
| 712 | #endif
|
| 713 |
|
| 714 | #if IS_ENABLED(CONFIG_INFINIBAND)
|
| 715 |
|
| 716 | void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
|
| 717 | const struct ib_device *ibdev, const char *fmt, ...)
|
| 718 | {
|
| 719 | struct va_format vaf;
|
| 720 | va_list args;
|
| 721 |
|
| 722 | va_start(args, fmt);
|
| 723 |
|
| 724 | vaf.fmt = fmt;
|
| 725 | vaf.va = &args;
|
| 726 |
|
| 727 | if (ibdev && ibdev->dev.parent) {
|
| 728 | char buf[PREFIX_SIZE] = "";
|
| 729 |
|
| 730 | dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent,
|
| 731 | "%s%s %s %s: %pV",
|
| 732 | dynamic_emit_prefix(descriptor, buf),
|
| 733 | dev_driver_string(ibdev->dev.parent),
|
| 734 | dev_name(ibdev->dev.parent),
|
| 735 | dev_name(&ibdev->dev),
|
| 736 | &vaf);
|
| 737 | } else if (ibdev) {
|
| 738 | printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf);
|
| 739 | } else {
|
| 740 | printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf);
|
| 741 | }
|
| 742 |
|
| 743 | va_end(args);
|
| 744 | }
|
| 745 | EXPORT_SYMBOL(__dynamic_ibdev_dbg);
|
| 746 |
|
| 747 | #endif
|
| 748 |
|
| 749 | #define DDEBUG_STRING_SIZE 1024
|
| 750 | static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
|
| 751 |
|
| 752 | static __init int ddebug_setup_query(char *str)
|
| 753 | {
|
| 754 | if (strlen(str) >= DDEBUG_STRING_SIZE) {
|
| 755 | pr_warn("ddebug boot param string too large\n");
|
| 756 | return 0;
|
| 757 | }
|
| 758 | strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
|
| 759 | return 1;
|
| 760 | }
|
| 761 |
|
| 762 | __setup("ddebug_query=", ddebug_setup_query);
|
| 763 |
|
| 764 | |
| 765 | * File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the
|
| 766 | * command text from userspace, parses and executes it.
|
| 767 |
|
| 768 | #define USER_BUF_PAGE 4096
|
| 769 | static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
|
| 770 | size_t len, loff_t *offp)
|
| 771 | {
|
| 772 | char *tmpbuf;
|
| 773 | int ret;
|
| 774 |
|
| 775 | if (len == 0)
|
| 776 | return 0;
|
| 777 | if (len > USER_BUF_PAGE - 1) {
|
| 778 | pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
|
| 779 | return -E2BIG;
|
| 780 | }
|
| 781 | tmpbuf = memdup_user_nul(ubuf, len);
|
| 782 | if (IS_ERR(tmpbuf))
|
| 783 | return PTR_ERR(tmpbuf);
|
| 784 | vpr_info("read %d bytes from userspace\n", (int)len);
|
| 785 |
|
| 786 | ret = ddebug_exec_queries(tmpbuf, NULL);
|
| 787 | kfree(tmpbuf);
|
| 788 | if (ret < 0)
|
| 789 | return ret;
|
| 790 |
|
| 791 | *offp += len;
|
| 792 | return len;
|
| 793 | }
|
| 794 |
|
| 795 | |
| 796 | * Set the iterator to point to the first _ddebug object
|
| 797 | * and return a pointer to that first object. Returns
|
| 798 | * NULL if there are no _ddebugs at all.
|
| 799 |
|
| 800 | static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
|
| 801 | {
|
| 802 | if (list_empty(&ddebug_tables)) {
|
| 803 | iter->table = NULL;
|
| 804 | iter->idx = 0;
|
| 805 | return NULL;
|
| 806 | }
|
| 807 | iter->table = list_entry(ddebug_tables.next,
|
| 808 | struct ddebug_table, link);
|
| 809 | iter->idx = 0;
|
| 810 | return &iter->table->ddebugs[iter->idx];
|
| 811 | }
|
| 812 |
|
| 813 | |
| 814 | * Advance the iterator to point to the next _ddebug
|
| 815 | * object from the one the iterator currently points at,
|
| 816 | * and returns a pointer to the new _ddebug. Returns
|
| 817 | * NULL if the iterator has seen all the _ddebugs.
|
| 818 |
|
| 819 | static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
|
| 820 | {
|
| 821 | if (iter->table == NULL)
|
| 822 | return NULL;
|
| 823 | if (++iter->idx == iter->table->num_ddebugs) {
|
| 824 |
|
| 825 | iter->idx = 0;
|
| 826 | if (list_is_last(&iter->table->link, &ddebug_tables)) {
|
| 827 | iter->table = NULL;
|
| 828 | return NULL;
|
| 829 | }
|
| 830 | iter->table = list_entry(iter->table->link.next,
|
| 831 | struct ddebug_table, link);
|
| 832 | }
|
| 833 | return &iter->table->ddebugs[iter->idx];
|
| 834 | }
|
| 835 |
|
| 836 | |
| 837 | * Seq_ops start method. Called at the start of every
|
| 838 | * read() call from userspace. Takes the ddebug_lock and
|
| 839 | * seeks the seq_file's iterator to the given position.
|
| 840 |
|
| 841 | static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
|
| 842 | {
|
| 843 | struct ddebug_iter *iter = m->private;
|
| 844 | struct _ddebug *dp;
|
| 845 | int n = *pos;
|
| 846 |
|
| 847 | mutex_lock(&ddebug_lock);
|
| 848 |
|
| 849 | if (!n)
|
| 850 | return SEQ_START_TOKEN;
|
| 851 | if (n < 0)
|
| 852 | return NULL;
|
| 853 | dp = ddebug_iter_first(iter);
|
| 854 | while (dp != NULL && --n > 0)
|
| 855 | dp = ddebug_iter_next(iter);
|
| 856 | return dp;
|
| 857 | }
|
| 858 |
|
| 859 | |
| 860 | * Seq_ops next method. Called several times within a read()
|
| 861 | * call from userspace, with ddebug_lock held. Walks to the
|
| 862 | * next _ddebug object with a special case for the header line.
|
| 863 |
|
| 864 | static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
|
| 865 | {
|
| 866 | struct ddebug_iter *iter = m->private;
|
| 867 | struct _ddebug *dp;
|
| 868 |
|
| 869 | if (p == SEQ_START_TOKEN)
|
| 870 | dp = ddebug_iter_first(iter);
|
| 871 | else
|
| 872 | dp = ddebug_iter_next(iter);
|
| 873 | ++*pos;
|
| 874 | return dp;
|
| 875 | }
|
| 876 |
|
| 877 | |
| 878 | * Seq_ops show method. Called several times within a read()
|
| 879 | * call from userspace, with ddebug_lock held. Formats the
|
| 880 | * current _ddebug as a single human-readable line, with a
|
| 881 | * special case for the header line.
|
| 882 |
|
| 883 | static int ddebug_proc_show(struct seq_file *m, void *p)
|
| 884 | {
|
| 885 | struct ddebug_iter *iter = m->private;
|
| 886 | struct _ddebug *dp = p;
|
| 887 | struct flagsbuf flags;
|
| 888 |
|
| 889 | if (p == SEQ_START_TOKEN) {
|
| 890 | seq_puts(m,
|
| 891 | "# filename:lineno [module]function flags format\n");
|
| 892 | return 0;
|
| 893 | }
|
| 894 |
|
| 895 | seq_printf(m, "%s:%u [%s]%s =%s \"",
|
| 896 | trim_prefix(dp->filename), dp->lineno,
|
| 897 | iter->table->mod_name, dp->function,
|
| 898 | ddebug_describe_flags(dp->flags, &flags));
|
| 899 | seq_escape(m, dp->format, "\t\r\n\"");
|
| 900 | seq_puts(m, "\"\n");
|
| 901 |
|
| 902 | return 0;
|
| 903 | }
|
| 904 |
|
| 905 | |
| 906 | * Seq_ops stop method. Called at the end of each read()
|
| 907 | * call from userspace. Drops ddebug_lock.
|
| 908 |
|
| 909 | static void ddebug_proc_stop(struct seq_file *m, void *p)
|
| 910 | {
|
| 911 | mutex_unlock(&ddebug_lock);
|
| 912 | }
|
| 913 |
|
| 914 | static const struct seq_operations ddebug_proc_seqops = {
|
| 915 | .start = ddebug_proc_start,
|
| 916 | .next = ddebug_proc_next,
|
| 917 | .show = ddebug_proc_show,
|
| 918 | .stop = ddebug_proc_stop
|
| 919 | };
|
| 920 |
|
| 921 | static int ddebug_proc_open(struct inode *inode, struct file *file)
|
| 922 | {
|
| 923 | return seq_open_private(file, &ddebug_proc_seqops,
|
| 924 | sizeof(struct ddebug_iter));
|
| 925 | }
|
| 926 |
|
| 927 | static const struct file_operations ddebug_proc_fops = {
|
| 928 | .owner = THIS_MODULE,
|
| 929 | .open = ddebug_proc_open,
|
| 930 | .read = seq_read,
|
| 931 | .llseek = seq_lseek,
|
| 932 | .release = seq_release_private,
|
| 933 | .write = ddebug_proc_write
|
| 934 | };
|
| 935 |
|
| 936 | static const struct proc_ops proc_fops = {
|
| 937 | .proc_open = ddebug_proc_open,
|
| 938 | .proc_read = seq_read,
|
| 939 | .proc_lseek = seq_lseek,
|
| 940 | .proc_release = seq_release_private,
|
| 941 | .proc_write = ddebug_proc_write
|
| 942 | };
|
| 943 |
|
| 944 | |
| 945 | * Allocate a new ddebug_table for the given module
|
| 946 | * and add it to the global list.
|
| 947 |
|
| 948 | int ddebug_add_module(struct _ddebug *tab, unsigned int n,
|
| 949 | const char *name)
|
| 950 | {
|
| 951 | struct ddebug_table *dt;
|
| 952 |
|
| 953 | dt = kzalloc(sizeof(*dt), GFP_KERNEL);
|
| 954 | if (dt == NULL) {
|
| 955 | pr_err("error adding module: %s\n", name);
|
| 956 | return -ENOMEM;
|
| 957 | }
|
| 958 | |
| 959 | * For built-in modules, name lives in .rodata and is
|
| 960 | * immortal. For loaded modules, name points at the name[]
|
| 961 | * member of struct module, which lives at least as long as
|
| 962 | * this struct ddebug_table.
|
| 963 |
|
| 964 | dt->mod_name = name;
|
| 965 | dt->num_ddebugs = n;
|
| 966 | dt->ddebugs = tab;
|
| 967 |
|
| 968 | mutex_lock(&ddebug_lock);
|
| 969 | list_add(&dt->link, &ddebug_tables);
|
| 970 | mutex_unlock(&ddebug_lock);
|
| 971 |
|
| 972 | v2pr_info("%3u debug prints in module %s\n", n, dt->mod_name);
|
| 973 | return 0;
|
| 974 | }
|
| 975 |
|
| 976 |
|
| 977 | static int ddebug_dyndbg_param_cb(char *param, char *val,
|
| 978 | const char *modname, int on_err)
|
| 979 | {
|
| 980 | char *sep;
|
| 981 |
|
| 982 | sep = strchr(param, '.');
|
| 983 | if (sep) {
|
| 984 |
|
| 985 | *sep = '\0';
|
| 986 | modname = param;
|
| 987 | param = sep + 1;
|
| 988 | }
|
| 989 | if (strcmp(param, "dyndbg"))
|
| 990 | return on_err;
|
| 991 |
|
| 992 | ddebug_exec_queries((val ? val : "+p"), modname);
|
| 993 |
|
| 994 | return 0;
|
| 995 | }
|
| 996 |
|
| 997 |
|
| 998 | static int ddebug_dyndbg_boot_param_cb(char *param, char *val,
|
| 999 | const char *unused, void *arg)
|
| 1000 | {
|
| 1001 | vpr_info("%s=\"%s\"\n", param, val);
|
| 1002 | return ddebug_dyndbg_param_cb(param, val, NULL, 0);
|
| 1003 | }
|
| 1004 |
|
| 1005 | |
| 1006 | * modprobe foo finds foo.params in boot-args, strips "foo.", and
|
| 1007 | * passes them to load_module(). This callback gets unknown params,
|
| 1008 | * processes dyndbg params, rejects others.
|
| 1009 |
|
| 1010 | int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
|
| 1011 | {
|
| 1012 | vpr_info("module: %s %s=\"%s\"\n", module, param, val);
|
| 1013 | return ddebug_dyndbg_param_cb(param, val, module, -ENOENT);
|
| 1014 | }
|
| 1015 |
|
| 1016 | static void ddebug_table_free(struct ddebug_table *dt)
|
| 1017 | {
|
| 1018 | list_del_init(&dt->link);
|
| 1019 | kfree(dt);
|
| 1020 | }
|
| 1021 |
|
| 1022 | |
| 1023 | * Called in response to a module being unloaded. Removes
|
| 1024 | * any ddebug_table's which point at the module.
|
| 1025 |
|
| 1026 | int ddebug_remove_module(const char *mod_name)
|
| 1027 | {
|
| 1028 | struct ddebug_table *dt, *nextdt;
|
| 1029 | int ret = -ENOENT;
|
| 1030 |
|
| 1031 | v2pr_info("removing module \"%s\"\n", mod_name);
|
| 1032 |
|
| 1033 | mutex_lock(&ddebug_lock);
|
| 1034 | list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
|
| 1035 | if (dt->mod_name == mod_name) {
|
| 1036 | ddebug_table_free(dt);
|
| 1037 | ret = 0;
|
| 1038 | break;
|
| 1039 | }
|
| 1040 | }
|
| 1041 | mutex_unlock(&ddebug_lock);
|
| 1042 | return ret;
|
| 1043 | }
|
| 1044 |
|
| 1045 | static void ddebug_remove_all_tables(void)
|
| 1046 | {
|
| 1047 | mutex_lock(&ddebug_lock);
|
| 1048 | while (!list_empty(&ddebug_tables)) {
|
| 1049 | struct ddebug_table *dt = list_entry(ddebug_tables.next,
|
| 1050 | struct ddebug_table,
|
| 1051 | link);
|
| 1052 | ddebug_table_free(dt);
|
| 1053 | }
|
| 1054 | mutex_unlock(&ddebug_lock);
|
| 1055 | }
|
| 1056 |
|
| 1057 | static __initdata int ddebug_init_success;
|
| 1058 |
|
| 1059 | static int __init dynamic_debug_init_control(void)
|
| 1060 | {
|
| 1061 | struct proc_dir_entry *procfs_dir;
|
| 1062 | struct dentry *debugfs_dir;
|
| 1063 |
|
| 1064 | if (!ddebug_init_success)
|
| 1065 | return -ENODEV;
|
| 1066 |
|
| 1067 |
|
| 1068 | if (debugfs_initialized()) {
|
| 1069 | debugfs_dir = debugfs_create_dir("dynamic_debug", NULL);
|
| 1070 | debugfs_create_file("control", 0644, debugfs_dir, NULL,
|
| 1071 | &ddebug_proc_fops);
|
| 1072 | }
|
| 1073 |
|
| 1074 |
|
| 1075 | procfs_dir = proc_mkdir("dynamic_debug", NULL);
|
| 1076 | if (procfs_dir)
|
| 1077 | proc_create("control", 0644, procfs_dir, &proc_fops);
|
| 1078 |
|
| 1079 | return 0;
|
| 1080 | }
|
| 1081 |
|
| 1082 | static int __init dynamic_debug_init(void)
|
| 1083 | {
|
| 1084 | struct _ddebug *iter, *iter_start;
|
| 1085 | const char *modname = NULL;
|
| 1086 | char *cmdline;
|
| 1087 | int ret = 0;
|
| 1088 | int n = 0, entries = 0, modct = 0;
|
| 1089 |
|
| 1090 | if (&__start___dyndbg == &__stop___dyndbg) {
|
| 1091 | if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) {
|
| 1092 | pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build\n");
|
| 1093 | return 1;
|
| 1094 | }
|
| 1095 | pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build\n");
|
| 1096 | ddebug_init_success = 1;
|
| 1097 | return 0;
|
| 1098 | }
|
| 1099 | iter = __start___dyndbg;
|
| 1100 | modname = iter->modname;
|
| 1101 | iter_start = iter;
|
| 1102 | for (; iter < __stop___dyndbg; iter++) {
|
| 1103 | entries++;
|
| 1104 | if (strcmp(modname, iter->modname)) {
|
| 1105 | modct++;
|
| 1106 | ret = ddebug_add_module(iter_start, n, modname);
|
| 1107 | if (ret)
|
| 1108 | goto out_err;
|
| 1109 | n = 0;
|
| 1110 | modname = iter->modname;
|
| 1111 | iter_start = iter;
|
| 1112 | }
|
| 1113 | n++;
|
| 1114 | }
|
| 1115 | ret = ddebug_add_module(iter_start, n, modname);
|
| 1116 | if (ret)
|
| 1117 | goto out_err;
|
| 1118 |
|
| 1119 | ddebug_init_success = 1;
|
| 1120 | vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg section\n",
|
| 1121 | entries, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10),
|
| 1122 | (int)((entries * sizeof(struct _ddebug)) >> 10));
|
| 1123 |
|
| 1124 |
|
| 1125 | if (ddebug_setup_string[0] != '\0') {
|
| 1126 | pr_warn("ddebug_query param name is deprecated, change it to dyndbg\n");
|
| 1127 | ret = ddebug_exec_queries(ddebug_setup_string, NULL);
|
| 1128 | if (ret < 0)
|
| 1129 | pr_warn("Invalid ddebug boot param %s\n",
|
| 1130 | ddebug_setup_string);
|
| 1131 | else
|
| 1132 | pr_info("%d changes by ddebug_query\n", ret);
|
| 1133 | }
|
| 1134 | |
| 1135 | * again to find and activate queries given in dyndbg params.
|
| 1136 | * While this has already been done for known boot params, it
|
| 1137 | * ignored the unknown ones (dyndbg in particular). Reusing
|
| 1138 | * parse_args avoids ad-hoc parsing. This will also attempt
|
| 1139 | * to activate queries for not-yet-loaded modules, which is
|
| 1140 | * slightly noisy if verbose, but harmless.
|
| 1141 |
|
| 1142 | cmdline = kstrdup(saved_command_line, GFP_KERNEL);
|
| 1143 | parse_args("dyndbg params", cmdline, NULL,
|
| 1144 | 0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb);
|
| 1145 | kfree(cmdline);
|
| 1146 | return 0;
|
| 1147 |
|
| 1148 | out_err:
|
| 1149 | ddebug_remove_all_tables();
|
| 1150 | return 0;
|
| 1151 | }
|
| 1152 |
|
| 1153 | early_initcall(dynamic_debug_init);
|
| 1154 |
|
| 1155 |
|
| 1156 | fs_initcall(dynamic_debug_init_control);
|