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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; |
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const char *mod_name; |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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496 497 |
i++; } |
b8ccd5dee dynamic_debug: re... |
498 499 |
vpr_info("processed %d queries, with %d matches, %d errs ", |
85f7f6c0e dynamic_debug: pr... |
500 501 502 503 504 |
i, nfound, errs); if (exitcode) return exitcode; return nfound; |
fd89cfb87 Dynamic Debug: Sp... |
505 |
} |
431625dac dynamic_debug: us... |
506 507 508 509 510 511 512 513 514 515 |
#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) |
8ba6ebf58 Dynamic debug: Ad... |
516 |
{ |
431625dac dynamic_debug: us... |
517 518 |
int pos_after_tid; int pos = 0; |
8ba6ebf58 Dynamic debug: Ad... |
519 |
|
798efc60e dev_dbg/dynamic_d... |
520 |
*buf = '\0'; |
431625dac dynamic_debug: us... |
521 |
if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf58 Dynamic debug: Ad... |
522 |
if (in_interrupt()) |
798efc60e dev_dbg/dynamic_d... |
523 |
pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf58 Dynamic debug: Ad... |
524 |
else |
431625dac dynamic_debug: us... |
525 |
pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60e dev_dbg/dynamic_d... |
526 |
task_pid_vnr(current)); |
8ba6ebf58 Dynamic debug: Ad... |
527 |
} |
431625dac dynamic_debug: us... |
528 529 530 |
pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
531 |
desc->modname); |
431625dac dynamic_debug: us... |
532 533 |
if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
534 |
desc->function); |
431625dac dynamic_debug: us... |
535 |
if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7e dynamic_debug: fi... |
536 |
pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60e dev_dbg/dynamic_d... |
537 |
desc->lineno); |
431625dac dynamic_debug: us... |
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 dynamic_debug: Co... |
542 |
|
431625dac dynamic_debug: us... |
543 |
return buf; |
6c2140ee0 dynamic_debug: Co... |
544 |
} |
906d20153 dynamic_debug: ch... |
545 |
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf58 Dynamic debug: Ad... |
546 547 |
{ va_list args; |
431625dac dynamic_debug: us... |
548 549 |
struct va_format vaf; char buf[PREFIX_SIZE]; |
8ba6ebf58 Dynamic debug: Ad... |
550 551 552 553 554 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
555 |
|
431625dac dynamic_debug: us... |
556 557 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
558 |
|
906d20153 dynamic_debug: ch... |
559 |
printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60e dev_dbg/dynamic_d... |
560 |
|
8ba6ebf58 Dynamic debug: Ad... |
561 |
va_end(args); |
8ba6ebf58 Dynamic debug: Ad... |
562 563 |
} EXPORT_SYMBOL(__dynamic_pr_debug); |
906d20153 dynamic_debug: ch... |
564 |
void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc466355 dynamic_debug: Ad... |
565 566 567 568 |
const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; |
cbc466355 dynamic_debug: Ad... |
569 570 571 572 573 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
574 |
|
cbc466355 dynamic_debug: Ad... |
575 576 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
577 578 |
if (!dev) { |
906d20153 dynamic_debug: ch... |
579 |
printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60e dev_dbg/dynamic_d... |
580 581 |
} else { char buf[PREFIX_SIZE]; |
798efc60e dev_dbg/dynamic_d... |
582 |
|
a39d4a857 printk: add and u... |
583 |
dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d20153 dynamic_debug: ch... |
584 585 586 |
dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e dev_dbg/dynamic_d... |
587 |
} |
cbc466355 dynamic_debug: Ad... |
588 |
va_end(args); |
cbc466355 dynamic_debug: Ad... |
589 590 |
} EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978 dynamic_debug: fi... |
591 |
#ifdef CONFIG_NET |
906d20153 dynamic_debug: ch... |
592 593 |
void __dynamic_netdev_dbg(struct _ddebug *descriptor, const struct net_device *dev, const char *fmt, ...) |
ffa10cb47 dynamic_debug: ma... |
594 595 596 |
{ struct va_format vaf; va_list args; |
ffa10cb47 dynamic_debug: ma... |
597 598 599 600 601 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497 netdev_printk/dyn... |
602 |
|
ffa10cb47 dynamic_debug: ma... |
603 604 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497 netdev_printk/dyn... |
605 606 607 |
if (dev && dev->dev.parent) { char buf[PREFIX_SIZE]; |
666f355f3 device and dynami... |
608 |
|
a39d4a857 printk: add and u... |
609 |
dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d20153 dynamic_debug: ch... |
610 611 612 613 614 615 |
"%s%s %s %s%s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev->dev.parent), dev_name(dev->dev.parent), netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
616 |
} else if (dev) { |
906d20153 dynamic_debug: ch... |
617 618 |
printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
619 |
} else { |
906d20153 dynamic_debug: ch... |
620 |
printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff497 netdev_printk/dyn... |
621 |
} |
ffa10cb47 dynamic_debug: ma... |
622 |
va_end(args); |
ffa10cb47 dynamic_debug: ma... |
623 624 |
} EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978 dynamic_debug: fi... |
625 |
#endif |
bc757f6f5 dynamic_debug: re... |
626 627 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b Dynamic Debug: In... |
628 629 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5 dynamic_debug: re... |
630 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c dynamic_debug: Co... |
631 632 |
pr_warn("ddebug boot param string too large "); |
a648ec05b Dynamic Debug: In... |
633 634 |
return 0; } |
bc757f6f5 dynamic_debug: re... |
635 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b Dynamic Debug: In... |
636 637 638 639 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f dynamic debug: co... |
640 |
/* |
231821d4c dynamic_debug: fi... |
641 |
* File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0f dynamic debug: co... |
642 643 |
* command text from userspace, parses and executes it. */ |
7281491c5 dynamic_debug: en... |
644 |
#define USER_BUF_PAGE 4096 |
e9d376f0f dynamic debug: co... |
645 646 647 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5 dynamic_debug: en... |
648 |
char *tmpbuf; |
fd89cfb87 Dynamic Debug: Sp... |
649 |
int ret; |
e9d376f0f dynamic debug: co... |
650 651 652 |
if (len == 0) return 0; |
7281491c5 dynamic_debug: en... |
653 654 655 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f dynamic debug: co... |
656 |
return -E2BIG; |
7281491c5 dynamic_debug: en... |
657 |
} |
16e5c1fc3 convert a bunch o... |
658 659 660 |
tmpbuf = memdup_user_nul(ubuf, len); if (IS_ERR(tmpbuf)) return PTR_ERR(tmpbuf); |
b8ccd5dee dynamic_debug: re... |
661 662 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f dynamic debug: co... |
663 |
|
8e59b5cfb dynamic_debug: ad... |
664 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5 dynamic_debug: en... |
665 |
kfree(tmpbuf); |
85f7f6c0e dynamic_debug: pr... |
666 |
if (ret < 0) |
fd89cfb87 Dynamic Debug: Sp... |
667 |
return ret; |
e9d376f0f dynamic debug: co... |
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 |
*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 dynamic_debug: re... |
724 725 |
vpr_info("called m=%p *pos=%lld ", m, (unsigned long long)*pos); |
e9d376f0f dynamic debug: co... |
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 |
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 dynamic_debug: re... |
748 749 |
vpr_info("called m=%p p=%p *pos=%lld ", |
f657fd21e dynamic_debug: Fi... |
750 |
m, p, (unsigned long long)*pos); |
e9d376f0f dynamic debug: co... |
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 |
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 dynamic_debug: de... |
770 |
char flagsbuf[10]; |
e9d376f0f dynamic debug: co... |
771 |
|
b8ccd5dee dynamic_debug: re... |
772 773 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f dynamic debug: co... |
774 775 776 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e dynamic_debug: Fi... |
777 778 |
"# filename:lineno [module]function flags format "); |
e9d376f0f dynamic debug: co... |
779 780 |
return 0; } |
5ca7d2a6c dynamic_debug: de... |
781 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e dynamic_debug: Fi... |
782 783 784 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
e9d376f0f dynamic debug: co... |
785 786 787 788 789 790 791 792 793 794 795 796 797 798 |
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 dynamic_debug: re... |
799 800 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f dynamic debug: co... |
801 802 803 804 805 806 807 808 809 810 811 |
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 dynamic_debug: fi... |
812 813 814 815 816 |
* 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 dynamic debug: co... |
817 818 819 |
*/ static int ddebug_proc_open(struct inode *inode, struct file *file) { |
b8ccd5dee dynamic_debug: re... |
820 821 |
vpr_info("called "); |
4bad78c55 lib/dynamic_debug... |
822 823 |
return seq_open_private(file, &ddebug_proc_seqops, sizeof(struct ddebug_iter)); |
e9d376f0f dynamic debug: co... |
824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 |
} 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; |
3e406b1d7 lib/dynamic_debug... |
843 |
const char *new_name; |
e9d376f0f dynamic debug: co... |
844 845 846 847 |
dt = kzalloc(sizeof(*dt), GFP_KERNEL); if (dt == NULL) return -ENOMEM; |
3e406b1d7 lib/dynamic_debug... |
848 |
new_name = kstrdup_const(name, GFP_KERNEL); |
e9d376f0f dynamic debug: co... |
849 850 851 852 853 854 |
if (new_name == NULL) { kfree(dt); return -ENOMEM; } dt->mod_name = new_name; dt->num_ddebugs = n; |
e9d376f0f dynamic debug: co... |
855 856 857 858 859 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); |
b8ccd5dee dynamic_debug: re... |
860 861 |
vpr_info("%u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f dynamic debug: co... |
862 863 864 |
return 0; } EXPORT_SYMBOL_GPL(ddebug_add_module); |
6ab676e96 dynamic_debug: co... |
865 866 867 |
/* 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 dynamic_debug: ma... |
868 |
{ |
b48420c1d dynamic_debug: ma... |
869 870 871 872 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96 dynamic_debug: co... |
873 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d dynamic_debug: ma... |
874 875 876 877 878 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96 dynamic_debug: co... |
879 |
return on_err; /* determined by caller */ |
b48420c1d dynamic_debug: ma... |
880 |
|
8e59b5cfb dynamic_debug: ad... |
881 |
ddebug_exec_queries((val ? val : "+p"), modname); |
b48420c1d dynamic_debug: ma... |
882 883 |
return 0; /* query failure shouldnt stop module load */ } |
6ab676e96 dynamic_debug: co... |
884 885 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, |
ecc861705 module: add extra... |
886 |
const char *unused, void *arg) |
b48420c1d dynamic_debug: ma... |
887 |
{ |
6ab676e96 dynamic_debug: co... |
888 889 890 891 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d dynamic_debug: ma... |
892 |
|
6ab676e96 dynamic_debug: co... |
893 894 895 896 897 898 899 900 901 902 |
/* * 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 dynamic_debug: ma... |
903 |
} |
e9d376f0f dynamic debug: co... |
904 905 906 |
static void ddebug_table_free(struct ddebug_table *dt) { list_del_init(&dt->link); |
3e406b1d7 lib/dynamic_debug... |
907 |
kfree_const(dt->mod_name); |
e9d376f0f dynamic debug: co... |
908 909 910 911 912 913 914 |
kfree(dt); } /* * Called in response to a module being unloaded. Removes * any ddebug_table's which point at the module. */ |
ff49d74ad module: initializ... |
915 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f dynamic debug: co... |
916 917 918 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
b8ccd5dee dynamic_debug: re... |
919 920 |
vpr_info("removing module \"%s\" ", mod_name); |
e9d376f0f dynamic debug: co... |
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 |
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 Dynamic Debug: In... |
945 946 947 |
static __initdata int ddebug_init_success; static int __init dynamic_debug_init_debugfs(void) |
e9d376f0f dynamic debug: co... |
948 949 |
{ struct dentry *dir, *file; |
6a5c083de Dynamic Debug: In... |
950 951 952 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f dynamic debug: co... |
953 954 955 956 957 958 959 960 961 962 |
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 Dynamic Debug: In... |
963 964 965 966 967 968 969 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d dynamic_debug: ma... |
970 |
char *cmdline; |
6a5c083de Dynamic Debug: In... |
971 |
int ret = 0; |
410769276 dynamic_debug: pr... |
972 973 |
int n = 0, entries = 0, modct = 0; int verbose_bytes = 0; |
6a5c083de Dynamic Debug: In... |
974 |
|
b5b78f838 dynamic_debug: ea... |
975 |
if (__start___verbose == __stop___verbose) { |
f657fd21e dynamic_debug: Fi... |
976 977 |
pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); |
b5b78f838 dynamic_debug: ea... |
978 979 980 981 982 983 |
return 1; } iter = __start___verbose; modname = iter->modname; iter_start = iter; for (; iter < __stop___verbose; iter++) { |
410769276 dynamic_debug: pr... |
984 985 986 |
entries++; verbose_bytes += strlen(iter->modname) + strlen(iter->function) + strlen(iter->filename) + strlen(iter->format); |
b5b78f838 dynamic_debug: ea... |
987 |
if (strcmp(modname, iter->modname)) { |
410769276 dynamic_debug: pr... |
988 |
modct++; |
b5b78f838 dynamic_debug: ea... |
989 990 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
991 |
goto out_err; |
b5b78f838 dynamic_debug: ea... |
992 993 994 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f dynamic debug: co... |
995 |
} |
b5b78f838 dynamic_debug: ea... |
996 |
n++; |
e9d376f0f dynamic debug: co... |
997 |
} |
b5b78f838 dynamic_debug: ea... |
998 999 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1000 |
goto out_err; |
a648ec05b Dynamic Debug: In... |
1001 |
|
af442399f dynamic_debug: si... |
1002 |
ddebug_init_success = 1; |
f657fd21e dynamic_debug: Fi... |
1003 1004 1005 1006 |
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 dynamic_debug: si... |
1007 1008 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b Dynamic Debug: In... |
1009 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e dynamic_debug: Fi... |
1010 1011 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb dynamic_debug: ad... |
1012 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e dynamic_debug: pr... |
1013 |
if (ret < 0) |
f657fd21e dynamic_debug: Fi... |
1014 1015 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c dynamic_debug: Co... |
1016 |
ddebug_setup_string); |
a648ec05b Dynamic Debug: In... |
1017 |
else |
85f7f6c0e dynamic_debug: pr... |
1018 1019 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b Dynamic Debug: In... |
1020 |
} |
b48420c1d dynamic_debug: ma... |
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
/* 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, |
ecc861705 module: add extra... |
1031 |
0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1d dynamic_debug: ma... |
1032 |
kfree(cmdline); |
af442399f dynamic_debug: si... |
1033 |
return 0; |
a648ec05b Dynamic Debug: In... |
1034 |
|
af442399f dynamic_debug: si... |
1035 1036 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f dynamic debug: co... |
1037 1038 |
return 0; } |
6a5c083de Dynamic Debug: In... |
1039 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab dynamic_debug: in... |
1040 |
early_initcall(dynamic_debug_init); |
b48420c1d dynamic_debug: ma... |
1041 |
|
6a5c083de Dynamic Debug: In... |
1042 |
/* Debugfs setup must be done later */ |
3ec5652ab dynamic_debug: in... |
1043 |
fs_initcall(dynamic_debug_init_debugfs); |