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lib/dynamic_debug.c
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/* * lib/dynamic_debug.c * * make pr_debug()/dev_dbg() calls runtime configurable based upon their * source module. * * Copyright (C) 2008 Jason Baron <jbaron@redhat.com> * By Greg Banks <gnb@melbourne.sgi.com> * Copyright (c) 2008 Silicon Graphics Inc. All Rights Reserved. |
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* Copyright (C) 2011 Bart Van Assche. All Rights Reserved. |
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* Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
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#include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/moduleparam.h> #include <linux/kallsyms.h> #include <linux/types.h> |
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#include <linux/mutex.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/list.h> #include <linux/sysctl.h> |
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#include <linux/ctype.h> |
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#include <linux/string.h> |
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#include <linux/parser.h> |
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#include <linux/string_helpers.h> |
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#include <linux/uaccess.h> |
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#include <linux/dynamic_debug.h> #include <linux/debugfs.h> |
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#include <linux/slab.h> |
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#include <linux/jump_label.h> |
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#include <linux/hardirq.h> |
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#include <linux/sched.h> |
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#include <linux/device.h> |
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#include <linux/netdevice.h> |
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extern struct _ddebug __start___verbose[]; extern struct _ddebug __stop___verbose[]; |
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struct ddebug_table { struct list_head link; char *mod_name; unsigned int num_ddebugs; |
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struct _ddebug *ddebugs; }; struct ddebug_query { const char *filename; const char *module; const char *function; const char *format; unsigned int first_lineno, last_lineno; }; struct ddebug_iter { struct ddebug_table *table; unsigned int idx; }; static DEFINE_MUTEX(ddebug_lock); static LIST_HEAD(ddebug_tables); |
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static int verbose; |
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module_param(verbose, int, 0644); |
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/* Return the path relative to source root */ static inline const char *trim_prefix(const char *path) { int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); if (strncmp(path, __FILE__, skip)) skip = 0; /* prefix mismatch, don't skip */ return path + skip; } |
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static struct { unsigned flag:8; char opt_char; } opt_array[] = { { _DPRINTK_FLAGS_PRINT, 'p' }, { _DPRINTK_FLAGS_INCL_MODNAME, 'm' }, { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' }, { _DPRINTK_FLAGS_INCL_LINENO, 'l' }, { _DPRINTK_FLAGS_INCL_TID, 't' }, |
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{ _DPRINTK_FLAGS_NONE, '_' }, |
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}; |
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/* format a string into buf[] which describes the _ddebug's flags */ static char *ddebug_describe_flags(struct _ddebug *dp, char *buf, size_t maxlen) { char *p = buf; |
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int i; |
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BUG_ON(maxlen < 6); |
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for (i = 0; i < ARRAY_SIZE(opt_array); ++i) if (dp->flags & opt_array[i].flag) *p++ = opt_array[i].opt_char; |
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if (p == buf) |
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*p++ = '_'; |
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*p = '\0'; return buf; } |
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#define vpr_info(fmt, ...) \ |
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do { \ |
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if (verbose) \ pr_info(fmt, ##__VA_ARGS__); \ |
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} while (0) |
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static void vpr_info_dq(const struct ddebug_query *query, const char *msg) { /* trim any trailing newlines */ int fmtlen = 0; if (query->format) { fmtlen = strlen(query->format); while (fmtlen && query->format[fmtlen - 1] == ' ') fmtlen--; } vpr_info("%s: func=\"%s\" file=\"%s\" module=\"%s\" format=\"%.*s\" lineno=%u-%u ", msg, query->function ? query->function : "", query->filename ? query->filename : "", query->module ? query->module : "", fmtlen, query->format ? query->format : "", query->first_lineno, query->last_lineno); } |
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/* |
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* Search the tables for _ddebug's which match the given `query' and * apply the `flags' and `mask' to them. Returns number of matching * callsites, normally the same as number of changes. If verbose, * logs the changes. Takes ddebug_lock. |
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*/ |
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static int ddebug_change(const struct ddebug_query *query, unsigned int flags, unsigned int mask) |
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{ int i; struct ddebug_table *dt; unsigned int newflags; unsigned int nfound = 0; |
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char flagbuf[10]; |
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/* search for matching ddebugs */ mutex_lock(&ddebug_lock); list_for_each_entry(dt, &ddebug_tables, link) { /* match against the module name */ |
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if (query->module && !match_wildcard(query->module, dt->mod_name)) |
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continue; |
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for (i = 0; i < dt->num_ddebugs; i++) { |
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struct _ddebug *dp = &dt->ddebugs[i]; /* match against the source filename */ |
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if (query->filename && |
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!match_wildcard(query->filename, dp->filename) && !match_wildcard(query->filename, kbasename(dp->filename)) && !match_wildcard(query->filename, trim_prefix(dp->filename))) |
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continue; /* match against the function */ |
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if (query->function && |
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!match_wildcard(query->function, dp->function)) |
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continue; /* match against the format */ |
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if (query->format && !strstr(dp->format, query->format)) |
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continue; /* match against the line number range */ if (query->first_lineno && dp->lineno < query->first_lineno) continue; if (query->last_lineno && dp->lineno > query->last_lineno) continue; nfound++; newflags = (dp->flags & mask) | flags; if (newflags == dp->flags) continue; |
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dp->flags = newflags; |
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vpr_info("changed %s:%d [%s]%s =%s ", |
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trim_prefix(dp->filename), dp->lineno, dt->mod_name, dp->function, ddebug_describe_flags(dp, flagbuf, sizeof(flagbuf))); |
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} } mutex_unlock(&ddebug_lock); if (!nfound && verbose) |
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pr_info("no matches for query "); |
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return nfound; |
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} /* |
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* Split the buffer `buf' into space-separated words. |
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* Handles simple " and ' quoting, i.e. without nested, * embedded or escaped \". Return the number of words * or <0 on error. |
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*/ static int ddebug_tokenize(char *buf, char *words[], int maxwords) { int nwords = 0; |
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while (*buf) { char *end; /* Skip leading whitespace */ |
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buf = skip_spaces(buf); |
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if (!*buf) break; /* oh, it was trailing whitespace */ |
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if (*buf == '#') break; /* token starts comment, skip rest of line */ |
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/* find `end' of word, whitespace separated or quoted */ |
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if (*buf == '"' || *buf == '\'') { int quote = *buf++; |
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for (end = buf; *end && *end != quote; end++) |
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; |
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if (!*end) { pr_err("unclosed quote: %s ", buf); |
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return -EINVAL; /* unclosed quote */ |
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} |
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} else { |
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for (end = buf; *end && !isspace(*end); end++) |
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; BUG_ON(end == buf); } |
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/* `buf' is start of word, `end' is one past its end */ |
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if (nwords == maxwords) { pr_err("too many words, legal max <=%d ", maxwords); |
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return -EINVAL; /* ran out of words[] before bytes */ |
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} |
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if (*end) *end++ = '\0'; /* terminate the word */ words[nwords++] = buf; buf = end; } |
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if (verbose) { int i; |
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pr_info("split into words:"); |
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for (i = 0; i < nwords; i++) |
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pr_cont(" \"%s\"", words[i]); pr_cont(" "); |
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} return nwords; } /* * Parse a single line number. Note that the empty string "" * is treated as a special case and converted to zero, which * is later treated as a "don't care" value. */ static inline int parse_lineno(const char *str, unsigned int *val) { |
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BUG_ON(str == NULL); if (*str == '\0') { *val = 0; return 0; } |
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if (kstrtouint(str, 10, val) < 0) { |
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pr_err("bad line-number: %s ", str); return -EINVAL; } return 0; |
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} |
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static int check_set(const char **dest, char *src, char *name) { int rc = 0; if (*dest) { rc = -EINVAL; |
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pr_err("match-spec:%s val:%s overridden by %s ", name, *dest, src); |
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} *dest = src; return rc; } |
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/* * Parse words[] as a ddebug query specification, which is a series * of (keyword, value) pairs chosen from these possibilities: * * func <function-name> * file <full-pathname> * file <base-filename> * module <module-name> * format <escaped-string-to-find-in-format> * line <lineno> * line <first-lineno>-<last-lineno> // where either may be empty |
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* * Only 1 of each type is allowed. * Returns 0 on success, <0 on error. |
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*/ static int ddebug_parse_query(char *words[], int nwords, |
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struct ddebug_query *query, const char *modname) |
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{ unsigned int i; |
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int rc = 0; |
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/* check we have an even number of words */ |
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if (nwords % 2 != 0) { pr_err("expecting pairs of match-spec <value> "); |
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return -EINVAL; |
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} |
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memset(query, 0, sizeof(*query)); |
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if (modname) /* support $modname.dyndbg=<multiple queries> */ query->module = modname; |
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for (i = 0; i < nwords; i += 2) { if (!strcmp(words[i], "func")) { |
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rc = check_set(&query->function, words[i+1], "func"); |
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} else if (!strcmp(words[i], "file")) { |
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rc = check_set(&query->filename, words[i+1], "file"); |
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} else if (!strcmp(words[i], "module")) { |
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rc = check_set(&query->module, words[i+1], "module"); |
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} else if (!strcmp(words[i], "format")) { |
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string_unescape_inplace(words[i+1], UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_SPECIAL); rc = check_set(&query->format, words[i+1], "format"); |
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} else if (!strcmp(words[i], "line")) { |
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char *first = words[i+1]; char *last = strchr(first, '-'); |
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if (query->first_lineno || query->last_lineno) { |
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pr_err("match-spec: line used 2x "); |
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return -EINVAL; } |
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if (last) *last++ = '\0'; |
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if (parse_lineno(first, &query->first_lineno) < 0) |
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return -EINVAL; |
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if (last) { |
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/* range <first>-<last> */ |
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if (parse_lineno(last, &query->last_lineno) < 0) return -EINVAL; if (query->last_lineno < query->first_lineno) { |
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pr_err("last-line:%d < 1st-line:%d ", query->last_lineno, query->first_lineno); |
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return -EINVAL; |
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} |
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} else { query->last_lineno = query->first_lineno; } } else { |
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pr_err("unknown keyword \"%s\" ", words[i]); |
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return -EINVAL; } |
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if (rc) return rc; |
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} |
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vpr_info_dq(query, "parsed"); |
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return 0; } /* * Parse `str' as a flags specification, format [-+=][p]+. * Sets up *maskp and *flagsp to be used when changing the * flags fields of matched _ddebug's. Returns 0 on success * or <0 on error. */ static int ddebug_parse_flags(const char *str, unsigned int *flagsp, unsigned int *maskp) { unsigned flags = 0; |
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int op = '=', i; |
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switch (*str) { case '+': case '-': case '=': op = *str++; break; default: |
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pr_err("bad flag-op %c, at start of %s ", *str, str); |
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return -EINVAL; } |
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vpr_info("op='%c' ", op); |
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for (; *str ; ++str) { |
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for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { if (*str == opt_array[i].opt_char) { flags |= opt_array[i].flag; break; } |
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} |
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if (i < 0) { pr_err("unknown flag '%c' in \"%s\" ", *str, str); |
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return -EINVAL; |
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} |
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} |
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vpr_info("flags=0x%x ", flags); |
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/* calculate final *flagsp, *maskp according to mask and op */ switch (op) { case '=': *maskp = 0; *flagsp = flags; break; case '+': *maskp = ~0U; *flagsp = flags; break; case '-': *maskp = ~flags; *flagsp = 0; break; } |
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vpr_info("*flagsp=0x%x *maskp=0x%x ", *flagsp, *maskp); |
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return 0; } |
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static int ddebug_exec_query(char *query_string, const char *modname) |
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{ unsigned int flags = 0, mask = 0; struct ddebug_query query; #define MAXWORDS 9 |
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int nwords, nfound; |
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char *words[MAXWORDS]; nwords = ddebug_tokenize(query_string, words, MAXWORDS); |
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if (nwords <= 0) { pr_err("tokenize failed "); |
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return -EINVAL; |
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} /* check flags 1st (last arg) so query is pairs of spec,val */ if (ddebug_parse_flags(words[nwords-1], &flags, &mask)) { pr_err("flags parse failed "); |
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return -EINVAL; |
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} if (ddebug_parse_query(words, nwords-1, &query, modname)) { pr_err("query parse failed "); |
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return -EINVAL; |
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} |
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/* actually go and implement the change */ |
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nfound = ddebug_change(&query, flags, mask); |
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vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
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return nfound; } /* handle multiple queries in query string, continue on error, return last error or number of matching callsites. Module name is either in param (for boot arg) or perhaps in query string. */ |
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static int ddebug_exec_queries(char *query, const char *modname) |
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{ char *split; int i, errs = 0, exitcode = 0, rc, nfound = 0; for (i = 0; query; query = split) { split = strpbrk(query, "; "); if (split) *split++ = '\0'; query = skip_spaces(query); if (!query || !*query || *query == '#') continue; |
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vpr_info("query %d: \"%s\" ", i, query); |
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rc = ddebug_exec_query(query, modname); |
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if (rc < 0) { errs++; exitcode = rc; |
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} else { |
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nfound += rc; |
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} |
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i++; } |
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vpr_info("processed %d queries, with %d matches, %d errs ", |
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i, nfound, errs); if (exitcode) return exitcode; return nfound; |
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} |
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#define PREFIX_SIZE 64 static int remaining(int wrote) { if (PREFIX_SIZE - wrote > 0) return PREFIX_SIZE - wrote; return 0; } static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf) |
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{ |
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int pos_after_tid; int pos = 0; |
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|
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*buf = '\0'; |
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if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
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if (in_interrupt()) |
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pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
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else |
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pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
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task_pid_vnr(current)); |
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} |
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pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
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desc->modname); |
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if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
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desc->function); |
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if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
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pos += snprintf(buf + pos, remaining(pos), "%d:", |
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desc->lineno); |
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|
538 539 540 541 |
if (pos - pos_after_tid) pos += snprintf(buf + pos, remaining(pos), " "); if (pos >= PREFIX_SIZE) buf[PREFIX_SIZE - 1] = '\0'; |
6c2140ee0
|
542 |
|
431625dac
|
543 |
return buf; |
6c2140ee0
|
544 |
} |
8ba6ebf58
|
545 546 547 548 |
int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) { va_list args; int res; |
431625dac
|
549 550 |
struct va_format vaf; char buf[PREFIX_SIZE]; |
8ba6ebf58
|
551 552 553 554 555 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e
|
556 |
|
431625dac
|
557 558 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e
|
559 560 561 |
res = printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
8ba6ebf58
|
562 563 564 565 566 |
va_end(args); return res; } EXPORT_SYMBOL(__dynamic_pr_debug); |
cbc466355
|
567 568 569 570 571 572 573 574 575 576 577 |
int __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; int res; BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e
|
578 |
|
cbc466355
|
579 580 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e
|
581 582 583 584 585 |
if (!dev) { res = printk(KERN_DEBUG "(NULL device *): %pV", &vaf); } else { char buf[PREFIX_SIZE]; |
798efc60e
|
586 |
|
666f355f3
|
587 588 589 590 |
res = dev_printk_emit(7, dev, "%s%s %s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e
|
591 |
} |
cbc466355
|
592 593 594 595 596 |
va_end(args); return res; } EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978
|
597 |
#ifdef CONFIG_NET |
ffa10cb47
|
598 |
int __dynamic_netdev_dbg(struct _ddebug *descriptor, |
b004ff497
|
599 |
const struct net_device *dev, const char *fmt, ...) |
ffa10cb47
|
600 601 602 603 604 605 606 607 608 |
{ struct va_format vaf; va_list args; int res; BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497
|
609 |
|
ffa10cb47
|
610 611 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497
|
612 613 614 |
if (dev && dev->dev.parent) { char buf[PREFIX_SIZE]; |
666f355f3
|
615 616 617 618 619 620 621 |
res = dev_printk_emit(7, dev->dev.parent, "%s%s %s %s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev->dev.parent), dev_name(dev->dev.parent), netdev_name(dev), &vaf); |
b004ff497
|
622 623 624 625 626 |
} else if (dev) { res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf); } else { res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); } |
ffa10cb47
|
627 628 629 630 631 |
va_end(args); return res; } EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978
|
632 |
#endif |
bc757f6f5
|
633 634 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b
|
635 636 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5
|
637 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c
|
638 639 |
pr_warn("ddebug boot param string too large "); |
a648ec05b
|
640 641 |
return 0; } |
bc757f6f5
|
642 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b
|
643 644 645 646 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f
|
647 648 649 650 |
/* * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the * command text from userspace, parses and executes it. */ |
7281491c5
|
651 |
#define USER_BUF_PAGE 4096 |
e9d376f0f
|
652 653 654 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5
|
655 |
char *tmpbuf; |
fd89cfb87
|
656 |
int ret; |
e9d376f0f
|
657 658 659 |
if (len == 0) return 0; |
7281491c5
|
660 661 662 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f
|
663 |
return -E2BIG; |
7281491c5
|
664 665 666 667 668 669 |
} tmpbuf = kmalloc(len + 1, GFP_KERNEL); if (!tmpbuf) return -ENOMEM; if (copy_from_user(tmpbuf, ubuf, len)) { kfree(tmpbuf); |
e9d376f0f
|
670 |
return -EFAULT; |
7281491c5
|
671 |
} |
e9d376f0f
|
672 |
tmpbuf[len] = '\0'; |
b8ccd5dee
|
673 674 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f
|
675 |
|
8e59b5cfb
|
676 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5
|
677 |
kfree(tmpbuf); |
85f7f6c0e
|
678 |
if (ret < 0) |
fd89cfb87
|
679 |
return ret; |
e9d376f0f
|
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 |
*offp += len; return len; } /* * Set the iterator to point to the first _ddebug object * and return a pointer to that first object. Returns * NULL if there are no _ddebugs at all. */ static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter) { if (list_empty(&ddebug_tables)) { iter->table = NULL; iter->idx = 0; return NULL; } iter->table = list_entry(ddebug_tables.next, struct ddebug_table, link); iter->idx = 0; return &iter->table->ddebugs[iter->idx]; } /* * Advance the iterator to point to the next _ddebug * object from the one the iterator currently points at, * and returns a pointer to the new _ddebug. Returns * NULL if the iterator has seen all the _ddebugs. */ static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter) { if (iter->table == NULL) return NULL; if (++iter->idx == iter->table->num_ddebugs) { /* iterate to next table */ iter->idx = 0; if (list_is_last(&iter->table->link, &ddebug_tables)) { iter->table = NULL; return NULL; } iter->table = list_entry(iter->table->link.next, struct ddebug_table, link); } return &iter->table->ddebugs[iter->idx]; } /* * Seq_ops start method. Called at the start of every * read() call from userspace. Takes the ddebug_lock and * seeks the seq_file's iterator to the given position. */ static void *ddebug_proc_start(struct seq_file *m, loff_t *pos) { struct ddebug_iter *iter = m->private; struct _ddebug *dp; int n = *pos; |
b8ccd5dee
|
736 737 |
vpr_info("called m=%p *pos=%lld ", m, (unsigned long long)*pos); |
e9d376f0f
|
738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 |
mutex_lock(&ddebug_lock); if (!n) return SEQ_START_TOKEN; if (n < 0) return NULL; dp = ddebug_iter_first(iter); while (dp != NULL && --n > 0) dp = ddebug_iter_next(iter); return dp; } /* * Seq_ops next method. Called several times within a read() * call from userspace, with ddebug_lock held. Walks to the * next _ddebug object with a special case for the header line. */ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos) { struct ddebug_iter *iter = m->private; struct _ddebug *dp; |
b8ccd5dee
|
760 761 |
vpr_info("called m=%p p=%p *pos=%lld ", |
f657fd21e
|
762 |
m, p, (unsigned long long)*pos); |
e9d376f0f
|
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 |
if (p == SEQ_START_TOKEN) dp = ddebug_iter_first(iter); else dp = ddebug_iter_next(iter); ++*pos; return dp; } /* * Seq_ops show method. Called several times within a read() * call from userspace, with ddebug_lock held. Formats the * current _ddebug as a single human-readable line, with a * special case for the header line. */ static int ddebug_proc_show(struct seq_file *m, void *p) { struct ddebug_iter *iter = m->private; struct _ddebug *dp = p; |
5ca7d2a6c
|
782 |
char flagsbuf[10]; |
e9d376f0f
|
783 |
|
b8ccd5dee
|
784 785 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f
|
786 787 788 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e
|
789 790 |
"# filename:lineno [module]function flags format "); |
e9d376f0f
|
791 792 |
return 0; } |
5ca7d2a6c
|
793 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e
|
794 795 796 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
e9d376f0f
|
797 798 799 800 801 802 803 804 805 806 807 808 809 810 |
seq_escape(m, dp->format, "\t\r \""); seq_puts(m, "\" "); return 0; } /* * Seq_ops stop method. Called at the end of each read() * call from userspace. Drops ddebug_lock. */ static void ddebug_proc_stop(struct seq_file *m, void *p) { |
b8ccd5dee
|
811 812 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f
|
813 814 815 816 817 818 819 820 821 822 823 |
mutex_unlock(&ddebug_lock); } static const struct seq_operations ddebug_proc_seqops = { .start = ddebug_proc_start, .next = ddebug_proc_next, .show = ddebug_proc_show, .stop = ddebug_proc_stop }; /* |
07100be7e
|
824 825 826 827 828 |
* File_ops->open method for <debugfs>/dynamic_debug/control. Does * the seq_file setup dance, and also creates an iterator to walk the * _ddebugs. Note that we create a seq_file always, even for O_WRONLY * files where it's not needed, as doing so simplifies the ->release * method. |
e9d376f0f
|
829 830 831 832 833 |
*/ static int ddebug_proc_open(struct inode *inode, struct file *file) { struct ddebug_iter *iter; int err; |
b8ccd5dee
|
834 835 |
vpr_info("called "); |
e9d376f0f
|
836 837 838 839 840 841 842 843 844 845 |
iter = kzalloc(sizeof(*iter), GFP_KERNEL); if (iter == NULL) return -ENOMEM; err = seq_open(file, &ddebug_proc_seqops); if (err) { kfree(iter); return err; } |
f657fd21e
|
846 |
((struct seq_file *)file->private_data)->private = iter; |
e9d376f0f
|
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 |
return 0; } static const struct file_operations ddebug_proc_fops = { .owner = THIS_MODULE, .open = ddebug_proc_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, .write = ddebug_proc_write }; /* * Allocate a new ddebug_table for the given module * and add it to the global list. */ int ddebug_add_module(struct _ddebug *tab, unsigned int n, const char *name) { struct ddebug_table *dt; char *new_name; dt = kzalloc(sizeof(*dt), GFP_KERNEL); if (dt == NULL) return -ENOMEM; new_name = kstrdup(name, GFP_KERNEL); if (new_name == NULL) { kfree(dt); return -ENOMEM; } dt->mod_name = new_name; dt->num_ddebugs = n; |
e9d376f0f
|
879 880 881 882 883 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); |
b8ccd5dee
|
884 885 |
vpr_info("%u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f
|
886 887 888 |
return 0; } EXPORT_SYMBOL_GPL(ddebug_add_module); |
6ab676e96
|
889 890 891 |
/* helper for ddebug_dyndbg_(boot|module)_param_cb */ static int ddebug_dyndbg_param_cb(char *param, char *val, const char *modname, int on_err) |
b48420c1d
|
892 |
{ |
b48420c1d
|
893 894 895 896 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96
|
897 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d
|
898 899 900 901 902 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96
|
903 |
return on_err; /* determined by caller */ |
b48420c1d
|
904 |
|
8e59b5cfb
|
905 |
ddebug_exec_queries((val ? val : "+p"), modname); |
b48420c1d
|
906 907 |
return 0; /* query failure shouldnt stop module load */ } |
6ab676e96
|
908 909 910 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, const char *unused) |
b48420c1d
|
911 |
{ |
6ab676e96
|
912 913 914 915 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d
|
916 |
|
6ab676e96
|
917 918 919 920 921 922 923 924 925 926 |
/* * modprobe foo finds foo.params in boot-args, strips "foo.", and * passes them to load_module(). This callback gets unknown params, * processes dyndbg params, rejects others. */ int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module) { vpr_info("module: %s %s=\"%s\" ", module, param, val); return ddebug_dyndbg_param_cb(param, val, module, -ENOENT); |
b48420c1d
|
927 |
} |
e9d376f0f
|
928 929 930 931 932 933 934 935 936 937 938 |
static void ddebug_table_free(struct ddebug_table *dt) { list_del_init(&dt->link); kfree(dt->mod_name); kfree(dt); } /* * Called in response to a module being unloaded. Removes * any ddebug_table's which point at the module. */ |
ff49d74ad
|
939 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f
|
940 941 942 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
b8ccd5dee
|
943 944 |
vpr_info("removing module \"%s\" ", mod_name); |
e9d376f0f
|
945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 |
mutex_lock(&ddebug_lock); list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { if (!strcmp(dt->mod_name, mod_name)) { ddebug_table_free(dt); ret = 0; } } mutex_unlock(&ddebug_lock); return ret; } EXPORT_SYMBOL_GPL(ddebug_remove_module); static void ddebug_remove_all_tables(void) { mutex_lock(&ddebug_lock); while (!list_empty(&ddebug_tables)) { struct ddebug_table *dt = list_entry(ddebug_tables.next, struct ddebug_table, link); ddebug_table_free(dt); } mutex_unlock(&ddebug_lock); } |
6a5c083de
|
969 970 971 |
static __initdata int ddebug_init_success; static int __init dynamic_debug_init_debugfs(void) |
e9d376f0f
|
972 973 |
{ struct dentry *dir, *file; |
6a5c083de
|
974 975 976 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f
|
977 978 979 980 981 982 983 984 985 986 |
dir = debugfs_create_dir("dynamic_debug", NULL); if (!dir) return -ENOMEM; file = debugfs_create_file("control", 0644, dir, NULL, &ddebug_proc_fops); if (!file) { debugfs_remove(dir); return -ENOMEM; } |
6a5c083de
|
987 988 989 990 991 992 993 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d
|
994 |
char *cmdline; |
6a5c083de
|
995 |
int ret = 0; |
410769276
|
996 997 |
int n = 0, entries = 0, modct = 0; int verbose_bytes = 0; |
6a5c083de
|
998 |
|
b5b78f838
|
999 |
if (__start___verbose == __stop___verbose) { |
f657fd21e
|
1000 1001 |
pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); |
b5b78f838
|
1002 1003 1004 1005 1006 1007 |
return 1; } iter = __start___verbose; modname = iter->modname; iter_start = iter; for (; iter < __stop___verbose; iter++) { |
410769276
|
1008 1009 1010 |
entries++; verbose_bytes += strlen(iter->modname) + strlen(iter->function) + strlen(iter->filename) + strlen(iter->format); |
b5b78f838
|
1011 |
if (strcmp(modname, iter->modname)) { |
410769276
|
1012 |
modct++; |
b5b78f838
|
1013 1014 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f
|
1015 |
goto out_err; |
b5b78f838
|
1016 1017 1018 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f
|
1019 |
} |
b5b78f838
|
1020 |
n++; |
e9d376f0f
|
1021 |
} |
b5b78f838
|
1022 1023 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f
|
1024 |
goto out_err; |
a648ec05b
|
1025 |
|
af442399f
|
1026 |
ddebug_init_success = 1; |
f657fd21e
|
1027 1028 1029 1030 |
vpr_info("%d modules, %d entries and %d bytes in ddebug tables, %d bytes in (readonly) verbose section ", modct, entries, (int)(modct * sizeof(struct ddebug_table)), verbose_bytes + (int)(__stop___verbose - __start___verbose)); |
af442399f
|
1031 1032 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b
|
1033 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e
|
1034 1035 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb
|
1036 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e
|
1037 |
if (ret < 0) |
f657fd21e
|
1038 1039 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c
|
1040 |
ddebug_setup_string); |
a648ec05b
|
1041 |
else |
85f7f6c0e
|
1042 1043 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b
|
1044 |
} |
b48420c1d
|
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 |
/* now that ddebug tables are loaded, process all boot args * again to find and activate queries given in dyndbg params. * While this has already been done for known boot params, it * ignored the unknown ones (dyndbg in particular). Reusing * parse_args avoids ad-hoc parsing. This will also attempt * to activate queries for not-yet-loaded modules, which is * slightly noisy if verbose, but harmless. */ cmdline = kstrdup(saved_command_line, GFP_KERNEL); parse_args("dyndbg params", cmdline, NULL, 0, 0, 0, &ddebug_dyndbg_boot_param_cb); kfree(cmdline); |
af442399f
|
1057 |
return 0; |
a648ec05b
|
1058 |
|
af442399f
|
1059 1060 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f
|
1061 1062 |
return 0; } |
6a5c083de
|
1063 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab
|
1064 |
early_initcall(dynamic_debug_init); |
b48420c1d
|
1065 |
|
6a5c083de
|
1066 |
/* Debugfs setup must be done later */ |
3ec5652ab
|
1067 |
fs_initcall(dynamic_debug_init_debugfs); |