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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 |
} |
906d20153
|
545 |
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf58
|
546 547 |
{ va_list args; |
431625dac
|
548 549 |
struct va_format vaf; char buf[PREFIX_SIZE]; |
8ba6ebf58
|
550 551 552 553 554 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e
|
555 |
|
431625dac
|
556 557 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e
|
558 |
|
906d20153
|
559 |
printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60e
|
560 |
|
8ba6ebf58
|
561 |
va_end(args); |
8ba6ebf58
|
562 563 |
} EXPORT_SYMBOL(__dynamic_pr_debug); |
906d20153
|
564 |
void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc466355
|
565 566 567 568 |
const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; |
cbc466355
|
569 570 571 572 573 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e
|
574 |
|
cbc466355
|
575 576 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e
|
577 578 |
if (!dev) { |
906d20153
|
579 |
printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60e
|
580 581 |
} else { char buf[PREFIX_SIZE]; |
798efc60e
|
582 |
|
a39d4a857
|
583 |
dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d20153
|
584 585 586 |
dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e
|
587 |
} |
cbc466355
|
588 |
va_end(args); |
cbc466355
|
589 590 |
} EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978
|
591 |
#ifdef CONFIG_NET |
906d20153
|
592 593 |
void __dynamic_netdev_dbg(struct _ddebug *descriptor, const struct net_device *dev, const char *fmt, ...) |
ffa10cb47
|
594 595 596 |
{ struct va_format vaf; va_list args; |
ffa10cb47
|
597 598 599 600 601 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497
|
602 |
|
ffa10cb47
|
603 604 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497
|
605 606 607 |
if (dev && dev->dev.parent) { char buf[PREFIX_SIZE]; |
666f355f3
|
608 |
|
a39d4a857
|
609 |
dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d20153
|
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
|
616 |
} else if (dev) { |
906d20153
|
617 618 |
printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497
|
619 |
} else { |
906d20153
|
620 |
printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff497
|
621 |
} |
ffa10cb47
|
622 |
va_end(args); |
ffa10cb47
|
623 624 |
} EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978
|
625 |
#endif |
bc757f6f5
|
626 627 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b
|
628 629 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5
|
630 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c
|
631 632 |
pr_warn("ddebug boot param string too large "); |
a648ec05b
|
633 634 |
return 0; } |
bc757f6f5
|
635 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b
|
636 637 638 639 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f
|
640 641 642 643 |
/* * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the * command text from userspace, parses and executes it. */ |
7281491c5
|
644 |
#define USER_BUF_PAGE 4096 |
e9d376f0f
|
645 646 647 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5
|
648 |
char *tmpbuf; |
fd89cfb87
|
649 |
int ret; |
e9d376f0f
|
650 651 652 |
if (len == 0) return 0; |
7281491c5
|
653 654 655 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f
|
656 |
return -E2BIG; |
7281491c5
|
657 658 659 660 661 662 |
} tmpbuf = kmalloc(len + 1, GFP_KERNEL); if (!tmpbuf) return -ENOMEM; if (copy_from_user(tmpbuf, ubuf, len)) { kfree(tmpbuf); |
e9d376f0f
|
663 |
return -EFAULT; |
7281491c5
|
664 |
} |
e9d376f0f
|
665 |
tmpbuf[len] = '\0'; |
b8ccd5dee
|
666 667 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f
|
668 |
|
8e59b5cfb
|
669 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5
|
670 |
kfree(tmpbuf); |
85f7f6c0e
|
671 |
if (ret < 0) |
fd89cfb87
|
672 |
return ret; |
e9d376f0f
|
673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 |
*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
|
729 730 |
vpr_info("called m=%p *pos=%lld ", m, (unsigned long long)*pos); |
e9d376f0f
|
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 |
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
|
753 754 |
vpr_info("called m=%p p=%p *pos=%lld ", |
f657fd21e
|
755 |
m, p, (unsigned long long)*pos); |
e9d376f0f
|
756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 |
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
|
775 |
char flagsbuf[10]; |
e9d376f0f
|
776 |
|
b8ccd5dee
|
777 778 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f
|
779 780 781 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e
|
782 783 |
"# filename:lineno [module]function flags format "); |
e9d376f0f
|
784 785 |
return 0; } |
5ca7d2a6c
|
786 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e
|
787 788 789 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
e9d376f0f
|
790 791 792 793 794 795 796 797 798 799 800 801 802 803 |
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
|
804 805 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f
|
806 807 808 809 810 811 812 813 814 815 816 |
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
|
817 818 819 820 821 |
* 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
|
822 823 824 |
*/ static int ddebug_proc_open(struct inode *inode, struct file *file) { |
b8ccd5dee
|
825 826 |
vpr_info("called "); |
4bad78c55
|
827 828 |
return seq_open_private(file, &ddebug_proc_seqops, sizeof(struct ddebug_iter)); |
e9d376f0f
|
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 |
} 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
|
860 861 862 863 864 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); |
b8ccd5dee
|
865 866 |
vpr_info("%u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f
|
867 868 869 |
return 0; } EXPORT_SYMBOL_GPL(ddebug_add_module); |
6ab676e96
|
870 871 872 |
/* 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
|
873 |
{ |
b48420c1d
|
874 875 876 877 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96
|
878 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d
|
879 880 881 882 883 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96
|
884 |
return on_err; /* determined by caller */ |
b48420c1d
|
885 |
|
8e59b5cfb
|
886 |
ddebug_exec_queries((val ? val : "+p"), modname); |
b48420c1d
|
887 888 |
return 0; /* query failure shouldnt stop module load */ } |
6ab676e96
|
889 890 891 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, const char *unused) |
b48420c1d
|
892 |
{ |
6ab676e96
|
893 894 895 896 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d
|
897 |
|
6ab676e96
|
898 899 900 901 902 903 904 905 906 907 |
/* * 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
|
908 |
} |
e9d376f0f
|
909 910 911 912 913 914 915 916 917 918 919 |
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
|
920 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f
|
921 922 923 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
b8ccd5dee
|
924 925 |
vpr_info("removing module \"%s\" ", mod_name); |
e9d376f0f
|
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 |
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
|
950 951 952 |
static __initdata int ddebug_init_success; static int __init dynamic_debug_init_debugfs(void) |
e9d376f0f
|
953 954 |
{ struct dentry *dir, *file; |
6a5c083de
|
955 956 957 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f
|
958 959 960 961 962 963 964 965 966 967 |
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
|
968 969 970 971 972 973 974 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d
|
975 |
char *cmdline; |
6a5c083de
|
976 |
int ret = 0; |
410769276
|
977 978 |
int n = 0, entries = 0, modct = 0; int verbose_bytes = 0; |
6a5c083de
|
979 |
|
b5b78f838
|
980 |
if (__start___verbose == __stop___verbose) { |
f657fd21e
|
981 982 |
pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); |
b5b78f838
|
983 984 985 986 987 988 |
return 1; } iter = __start___verbose; modname = iter->modname; iter_start = iter; for (; iter < __stop___verbose; iter++) { |
410769276
|
989 990 991 |
entries++; verbose_bytes += strlen(iter->modname) + strlen(iter->function) + strlen(iter->filename) + strlen(iter->format); |
b5b78f838
|
992 |
if (strcmp(modname, iter->modname)) { |
410769276
|
993 |
modct++; |
b5b78f838
|
994 995 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f
|
996 |
goto out_err; |
b5b78f838
|
997 998 999 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f
|
1000 |
} |
b5b78f838
|
1001 |
n++; |
e9d376f0f
|
1002 |
} |
b5b78f838
|
1003 1004 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f
|
1005 |
goto out_err; |
a648ec05b
|
1006 |
|
af442399f
|
1007 |
ddebug_init_success = 1; |
f657fd21e
|
1008 1009 1010 1011 |
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
|
1012 1013 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b
|
1014 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e
|
1015 1016 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb
|
1017 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e
|
1018 |
if (ret < 0) |
f657fd21e
|
1019 1020 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c
|
1021 |
ddebug_setup_string); |
a648ec05b
|
1022 |
else |
85f7f6c0e
|
1023 1024 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b
|
1025 |
} |
b48420c1d
|
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
/* 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
|
1038 |
return 0; |
a648ec05b
|
1039 |
|
af442399f
|
1040 1041 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f
|
1042 1043 |
return 0; } |
6a5c083de
|
1044 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab
|
1045 |
early_initcall(dynamic_debug_init); |
b48420c1d
|
1046 |
|
6a5c083de
|
1047 |
/* Debugfs setup must be done later */ |
3ec5652ab
|
1048 |
fs_initcall(dynamic_debug_init_debugfs); |