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lib/dynamic_debug.c
25.3 KB
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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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*/ |
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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/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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|
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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 && strcmp(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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strcmp(query->filename, dp->filename) && |
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strcmp(query->filename, kbasename(dp->filename)) && |
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strcmp(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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strcmp(query->function, dp->function)) 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) { char *end = NULL; BUG_ON(str == NULL); if (*str == '\0') { *val = 0; return 0; } *val = simple_strtoul(str, &end, 10); |
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if (end == NULL || end == str || *end != '\0') { 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; |
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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) { pr_err("line-number is <0 "); |
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return -EINVAL; |
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} |
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if (last) { |
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/* range <first>-<last> */ |
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if (parse_lineno(last, &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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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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503 |
} |
431625dac dynamic_debug: us... |
504 505 506 507 508 509 510 511 512 513 |
#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... |
514 |
{ |
431625dac dynamic_debug: us... |
515 516 |
int pos_after_tid; int pos = 0; |
8ba6ebf58 Dynamic debug: Ad... |
517 |
|
798efc60e dev_dbg/dynamic_d... |
518 |
*buf = '\0'; |
431625dac dynamic_debug: us... |
519 |
if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf58 Dynamic debug: Ad... |
520 |
if (in_interrupt()) |
798efc60e dev_dbg/dynamic_d... |
521 |
pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf58 Dynamic debug: Ad... |
522 |
else |
431625dac dynamic_debug: us... |
523 |
pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60e dev_dbg/dynamic_d... |
524 |
task_pid_vnr(current)); |
8ba6ebf58 Dynamic debug: Ad... |
525 |
} |
431625dac dynamic_debug: us... |
526 527 528 |
pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
529 |
desc->modname); |
431625dac dynamic_debug: us... |
530 531 |
if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
532 |
desc->function); |
431625dac dynamic_debug: us... |
533 |
if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7e dynamic_debug: fi... |
534 |
pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60e dev_dbg/dynamic_d... |
535 |
desc->lineno); |
431625dac dynamic_debug: us... |
536 537 538 539 |
if (pos - pos_after_tid) pos += snprintf(buf + pos, remaining(pos), " "); if (pos >= PREFIX_SIZE) buf[PREFIX_SIZE - 1] = '\0'; |
6c2140ee0 dynamic_debug: Co... |
540 |
|
431625dac dynamic_debug: us... |
541 |
return buf; |
6c2140ee0 dynamic_debug: Co... |
542 |
} |
8ba6ebf58 Dynamic debug: Ad... |
543 544 545 546 |
int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) { va_list args; int res; |
431625dac dynamic_debug: us... |
547 548 |
struct va_format vaf; char buf[PREFIX_SIZE]; |
8ba6ebf58 Dynamic debug: Ad... |
549 550 551 552 553 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
554 |
|
431625dac dynamic_debug: us... |
555 556 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
557 558 559 |
res = printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
8ba6ebf58 Dynamic debug: Ad... |
560 561 562 563 564 |
va_end(args); return res; } EXPORT_SYMBOL(__dynamic_pr_debug); |
cbc466355 dynamic_debug: Ad... |
565 566 567 568 569 570 571 572 573 574 575 |
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 dev_dbg/dynamic_d... |
576 |
|
cbc466355 dynamic_debug: Ad... |
577 578 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
579 580 581 582 583 |
if (!dev) { res = printk(KERN_DEBUG "(NULL device *): %pV", &vaf); } else { char buf[PREFIX_SIZE]; |
798efc60e dev_dbg/dynamic_d... |
584 |
|
666f355f3 device and dynami... |
585 586 587 588 |
res = dev_printk_emit(7, dev, "%s%s %s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e dev_dbg/dynamic_d... |
589 |
} |
cbc466355 dynamic_debug: Ad... |
590 591 592 593 594 |
va_end(args); return res; } EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978 dynamic_debug: fi... |
595 |
#ifdef CONFIG_NET |
ffa10cb47 dynamic_debug: ma... |
596 |
int __dynamic_netdev_dbg(struct _ddebug *descriptor, |
b004ff497 netdev_printk/dyn... |
597 |
const struct net_device *dev, const char *fmt, ...) |
ffa10cb47 dynamic_debug: ma... |
598 599 600 601 602 603 604 605 606 |
{ struct va_format vaf; va_list args; int res; BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497 netdev_printk/dyn... |
607 |
|
ffa10cb47 dynamic_debug: ma... |
608 609 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497 netdev_printk/dyn... |
610 611 612 |
if (dev && dev->dev.parent) { char buf[PREFIX_SIZE]; |
666f355f3 device and dynami... |
613 614 615 616 617 618 619 |
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 netdev_printk/dyn... |
620 621 622 623 624 |
} else if (dev) { res = printk(KERN_DEBUG "%s: %pV", netdev_name(dev), &vaf); } else { res = printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); } |
ffa10cb47 dynamic_debug: ma... |
625 626 627 628 629 |
va_end(args); return res; } EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978 dynamic_debug: fi... |
630 |
#endif |
bc757f6f5 dynamic_debug: re... |
631 632 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b Dynamic Debug: In... |
633 634 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5 dynamic_debug: re... |
635 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c dynamic_debug: Co... |
636 637 |
pr_warn("ddebug boot param string too large "); |
a648ec05b Dynamic Debug: In... |
638 639 |
return 0; } |
bc757f6f5 dynamic_debug: re... |
640 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b Dynamic Debug: In... |
641 642 643 644 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f dynamic debug: co... |
645 646 647 648 |
/* * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the * command text from userspace, parses and executes it. */ |
7281491c5 dynamic_debug: en... |
649 |
#define USER_BUF_PAGE 4096 |
e9d376f0f dynamic debug: co... |
650 651 652 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5 dynamic_debug: en... |
653 |
char *tmpbuf; |
fd89cfb87 Dynamic Debug: Sp... |
654 |
int ret; |
e9d376f0f dynamic debug: co... |
655 656 657 |
if (len == 0) return 0; |
7281491c5 dynamic_debug: en... |
658 659 660 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f dynamic debug: co... |
661 |
return -E2BIG; |
7281491c5 dynamic_debug: en... |
662 663 664 665 666 667 |
} tmpbuf = kmalloc(len + 1, GFP_KERNEL); if (!tmpbuf) return -ENOMEM; if (copy_from_user(tmpbuf, ubuf, len)) { kfree(tmpbuf); |
e9d376f0f dynamic debug: co... |
668 |
return -EFAULT; |
7281491c5 dynamic_debug: en... |
669 |
} |
e9d376f0f dynamic debug: co... |
670 |
tmpbuf[len] = '\0'; |
b8ccd5dee dynamic_debug: re... |
671 672 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f dynamic debug: co... |
673 |
|
8e59b5cfb dynamic_debug: ad... |
674 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5 dynamic_debug: en... |
675 |
kfree(tmpbuf); |
85f7f6c0e dynamic_debug: pr... |
676 |
if (ret < 0) |
fd89cfb87 Dynamic Debug: Sp... |
677 |
return ret; |
e9d376f0f dynamic debug: co... |
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 |
*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... |
734 735 |
vpr_info("called m=%p *pos=%lld ", m, (unsigned long long)*pos); |
e9d376f0f dynamic debug: co... |
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 |
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... |
758 759 |
vpr_info("called m=%p p=%p *pos=%lld ", |
f657fd21e dynamic_debug: Fi... |
760 |
m, p, (unsigned long long)*pos); |
e9d376f0f dynamic debug: co... |
761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 |
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... |
780 |
char flagsbuf[10]; |
e9d376f0f dynamic debug: co... |
781 |
|
b8ccd5dee dynamic_debug: re... |
782 783 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f dynamic debug: co... |
784 785 786 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e dynamic_debug: Fi... |
787 788 |
"# filename:lineno [module]function flags format "); |
e9d376f0f dynamic debug: co... |
789 790 |
return 0; } |
5ca7d2a6c dynamic_debug: de... |
791 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e dynamic_debug: Fi... |
792 793 794 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf))); |
e9d376f0f dynamic debug: co... |
795 796 797 798 799 800 801 802 803 804 805 806 807 808 |
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... |
809 810 |
vpr_info("called m=%p p=%p ", m, p); |
e9d376f0f dynamic debug: co... |
811 812 813 814 815 816 817 818 819 820 821 |
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... |
822 823 824 825 826 |
* 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... |
827 828 829 830 831 |
*/ static int ddebug_proc_open(struct inode *inode, struct file *file) { struct ddebug_iter *iter; int err; |
b8ccd5dee dynamic_debug: re... |
832 833 |
vpr_info("called "); |
e9d376f0f dynamic debug: co... |
834 835 836 837 838 839 840 841 842 843 |
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 dynamic_debug: Fi... |
844 |
((struct seq_file *)file->private_data)->private = iter; |
e9d376f0f dynamic debug: co... |
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 |
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 dynamic debug: co... |
877 878 879 880 881 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); list_add_tail(&dt->link, &ddebug_tables); mutex_unlock(&ddebug_lock); |
b8ccd5dee dynamic_debug: re... |
882 883 |
vpr_info("%u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f dynamic debug: co... |
884 885 886 |
return 0; } EXPORT_SYMBOL_GPL(ddebug_add_module); |
6ab676e96 dynamic_debug: co... |
887 888 889 |
/* 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... |
890 |
{ |
b48420c1d dynamic_debug: ma... |
891 892 893 894 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96 dynamic_debug: co... |
895 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d dynamic_debug: ma... |
896 897 898 899 900 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96 dynamic_debug: co... |
901 |
return on_err; /* determined by caller */ |
b48420c1d dynamic_debug: ma... |
902 |
|
8e59b5cfb dynamic_debug: ad... |
903 |
ddebug_exec_queries((val ? val : "+p"), modname); |
b48420c1d dynamic_debug: ma... |
904 905 |
return 0; /* query failure shouldnt stop module load */ } |
6ab676e96 dynamic_debug: co... |
906 907 908 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, const char *unused) |
b48420c1d dynamic_debug: ma... |
909 |
{ |
6ab676e96 dynamic_debug: co... |
910 911 912 913 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d dynamic_debug: ma... |
914 |
|
6ab676e96 dynamic_debug: co... |
915 916 917 918 919 920 921 922 923 924 |
/* * 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... |
925 |
} |
e9d376f0f dynamic debug: co... |
926 927 928 929 930 931 932 933 934 935 936 |
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 module: initializ... |
937 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f dynamic debug: co... |
938 939 940 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
b8ccd5dee dynamic_debug: re... |
941 942 |
vpr_info("removing module \"%s\" ", mod_name); |
e9d376f0f dynamic debug: co... |
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 |
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... |
967 968 969 |
static __initdata int ddebug_init_success; static int __init dynamic_debug_init_debugfs(void) |
e9d376f0f dynamic debug: co... |
970 971 |
{ struct dentry *dir, *file; |
6a5c083de Dynamic Debug: In... |
972 973 974 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f dynamic debug: co... |
975 976 977 978 979 980 981 982 983 984 |
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... |
985 986 987 988 989 990 991 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d dynamic_debug: ma... |
992 |
char *cmdline; |
6a5c083de Dynamic Debug: In... |
993 |
int ret = 0; |
410769276 dynamic_debug: pr... |
994 995 |
int n = 0, entries = 0, modct = 0; int verbose_bytes = 0; |
6a5c083de Dynamic Debug: In... |
996 |
|
b5b78f838 dynamic_debug: ea... |
997 |
if (__start___verbose == __stop___verbose) { |
f657fd21e dynamic_debug: Fi... |
998 999 |
pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); |
b5b78f838 dynamic_debug: ea... |
1000 1001 1002 1003 1004 1005 |
return 1; } iter = __start___verbose; modname = iter->modname; iter_start = iter; for (; iter < __stop___verbose; iter++) { |
410769276 dynamic_debug: pr... |
1006 1007 1008 |
entries++; verbose_bytes += strlen(iter->modname) + strlen(iter->function) + strlen(iter->filename) + strlen(iter->format); |
b5b78f838 dynamic_debug: ea... |
1009 |
if (strcmp(modname, iter->modname)) { |
410769276 dynamic_debug: pr... |
1010 |
modct++; |
b5b78f838 dynamic_debug: ea... |
1011 1012 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1013 |
goto out_err; |
b5b78f838 dynamic_debug: ea... |
1014 1015 1016 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f dynamic debug: co... |
1017 |
} |
b5b78f838 dynamic_debug: ea... |
1018 |
n++; |
e9d376f0f dynamic debug: co... |
1019 |
} |
b5b78f838 dynamic_debug: ea... |
1020 1021 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1022 |
goto out_err; |
a648ec05b Dynamic Debug: In... |
1023 |
|
af442399f dynamic_debug: si... |
1024 |
ddebug_init_success = 1; |
f657fd21e dynamic_debug: Fi... |
1025 1026 1027 1028 |
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... |
1029 1030 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b Dynamic Debug: In... |
1031 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e dynamic_debug: Fi... |
1032 1033 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb dynamic_debug: ad... |
1034 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e dynamic_debug: pr... |
1035 |
if (ret < 0) |
f657fd21e dynamic_debug: Fi... |
1036 1037 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c dynamic_debug: Co... |
1038 |
ddebug_setup_string); |
a648ec05b Dynamic Debug: In... |
1039 |
else |
85f7f6c0e dynamic_debug: pr... |
1040 1041 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b Dynamic Debug: In... |
1042 |
} |
b48420c1d dynamic_debug: ma... |
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 |
/* 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 dynamic_debug: si... |
1055 |
return 0; |
a648ec05b Dynamic Debug: In... |
1056 |
|
af442399f dynamic_debug: si... |
1057 1058 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f dynamic debug: co... |
1059 1060 |
return 0; } |
6a5c083de Dynamic Debug: In... |
1061 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab dynamic_debug: in... |
1062 |
early_initcall(dynamic_debug_init); |
b48420c1d dynamic_debug: ma... |
1063 |
|
6a5c083de Dynamic Debug: In... |
1064 |
/* Debugfs setup must be done later */ |
3ec5652ab dynamic_debug: in... |
1065 |
fs_initcall(dynamic_debug_init_debugfs); |