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lib/dynamic_debug.c
28.3 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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* Copyright (C) 2013 Du, Changbin <changbin.du@gmail.com> |
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*/ |
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#define pr_fmt(fmt) "dyndbg: " fmt |
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|
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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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|
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#include <rdma/ib_verbs.h> |
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extern struct _ddebug __start___dyndbg[]; extern struct _ddebug __stop___dyndbg[]; |
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|
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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; }; |
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struct flag_settings { unsigned int flags; unsigned int mask; }; |
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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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struct flagsbuf { char buf[ARRAY_SIZE(opt_array)+1]; }; |
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/* format a string into buf[] which describes the _ddebug's flags */ |
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static char *ddebug_describe_flags(unsigned int flags, struct flagsbuf *fb) |
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{ |
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char *p = fb->buf; |
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int i; |
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|
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for (i = 0; i < ARRAY_SIZE(opt_array); ++i) |
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if (flags & opt_array[i].flag) |
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*p++ = opt_array[i].opt_char; |
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if (p == fb->buf) |
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*p++ = '_'; |
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*p = '\0'; |
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return fb->buf; |
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} |
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#define vnpr_info(lvl, fmt, ...) \ |
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do { \ |
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if (verbose >= lvl) \ |
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pr_info(fmt, ##__VA_ARGS__); \ |
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} while (0) |
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#define vpr_info(fmt, ...) vnpr_info(1, fmt, ##__VA_ARGS__) #define v2pr_info(fmt, ...) vnpr_info(2, fmt, ##__VA_ARGS__) |
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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, |
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query->function ?: "", query->filename ?: "", query->module ?: "", fmtlen, query->format ?: "", |
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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, |
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struct flag_settings *modifiers) |
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{ int i; struct ddebug_table *dt; unsigned int newflags; unsigned int nfound = 0; |
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struct flagsbuf fbuf; |
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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) { if (*query->format == '^') { char *p; /* anchored search. match must be at beginning */ p = strstr(dp->format, query->format+1); if (p != dp->format) continue; } else if (!strstr(dp->format, query->format)) continue; } |
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/* 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++; |
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newflags = (dp->flags & modifiers->mask) | modifiers->flags; |
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if (newflags == dp->flags) continue; |
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#ifdef CONFIG_JUMP_LABEL |
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if (dp->flags & _DPRINTK_FLAGS_PRINT) { |
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if (!(modifiers->flags & _DPRINTK_FLAGS_PRINT)) |
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static_branch_disable(&dp->key.dd_key_true); |
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} else if (modifiers->flags & _DPRINTK_FLAGS_PRINT) |
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static_branch_enable(&dp->key.dd_key_true); #endif |
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dp->flags = newflags; |
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v2pr_info("changed %s:%d [%s]%s =%s ", |
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trim_prefix(dp->filename), dp->lineno, dt->mod_name, dp->function, |
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ddebug_describe_flags(dp->flags, &fbuf)); |
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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 parse_linerange(struct ddebug_query *query, const char *first) { char *last = strchr(first, '-'); if (query->first_lineno || query->last_lineno) { pr_err("match-spec: line used 2x "); return -EINVAL; } if (last) *last++ = '\0'; if (parse_lineno(first, &query->first_lineno) < 0) return -EINVAL; if (last) { /* range <first>-<last> */ if (parse_lineno(last, &query->last_lineno) < 0) return -EINVAL; /* special case for last lineno not specified */ if (query->last_lineno == 0) query->last_lineno = UINT_MAX; if (query->last_lineno < query->first_lineno) { pr_err("last-line:%d < 1st-line:%d ", query->last_lineno, query->first_lineno); return -EINVAL; } } else { query->last_lineno = query->first_lineno; } vpr_info("parsed line %d-%d ", query->first_lineno, query->last_lineno); return 0; } |
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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 |
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* of (keyword, value) pairs chosen from these possibilities: |
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* * 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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char *fline; |
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/* check we have an even number of words */ if (nwords % 2 != 0) { pr_err("expecting pairs of match-spec <value> "); return -EINVAL; } |
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|
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if (modname) |
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/* support $modname.dyndbg=<multiple queries> */ query->module = modname; |
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for (i = 0; i < nwords; i += 2) { |
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char *keyword = words[i]; char *arg = words[i+1]; if (!strcmp(keyword, "func")) { rc = check_set(&query->function, arg, "func"); } else if (!strcmp(keyword, "file")) { if (check_set(&query->filename, arg, "file")) |
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return -EINVAL; /* tail :$info is function or line-range */ fline = strchr(query->filename, ':'); if (!fline) |
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continue; |
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*fline++ = '\0'; if (isalpha(*fline) || *fline == '*' || *fline == '?') { /* take as function name */ if (check_set(&query->function, fline, "func")) return -EINVAL; } else { if (parse_linerange(query, fline)) return -EINVAL; } |
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} else if (!strcmp(keyword, "module")) { rc = check_set(&query->module, arg, "module"); } else if (!strcmp(keyword, "format")) { string_unescape_inplace(arg, UNESCAPE_SPACE | |
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UNESCAPE_OCTAL | UNESCAPE_SPECIAL); |
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rc = check_set(&query->format, arg, "format"); } else if (!strcmp(keyword, "line")) { if (parse_linerange(query, arg)) |
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return -EINVAL; |
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} else { |
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pr_err("unknown keyword \"%s\" ", keyword); |
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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. */ |
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static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers) |
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{ |
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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) { |
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modifiers->flags |= opt_array[i].flag; |
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break; } |
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} |
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if (i < 0) { |
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pr_err("unknown flag '%c' ", *str); |
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return -EINVAL; |
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} |
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} |
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vpr_info("flags=0x%x ", modifiers->flags); |
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|
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/* calculate final flags, mask based upon op */ |
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switch (op) { case '=': |
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/* modifiers->flags already set */ modifiers->mask = 0; |
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break; case '+': |
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modifiers->mask = ~0U; |
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break; case '-': |
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modifiers->mask = ~modifiers->flags; modifiers->flags = 0; |
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break; } |
84da83a6f dyndbg: combine f... |
479 480 |
vpr_info("*flagsp=0x%x *maskp=0x%x ", modifiers->flags, modifiers->mask); |
e9d376f0f dynamic debug: co... |
481 482 |
return 0; } |
8e59b5cfb dynamic_debug: ad... |
483 |
static int ddebug_exec_query(char *query_string, const char *modname) |
fd89cfb87 Dynamic Debug: Sp... |
484 |
{ |
84da83a6f dyndbg: combine f... |
485 |
struct flag_settings modifiers = {}; |
9c9d0acbe dyndbg: prefer de... |
486 |
struct ddebug_query query = {}; |
fd89cfb87 Dynamic Debug: Sp... |
487 |
#define MAXWORDS 9 |
85f7f6c0e dynamic_debug: pr... |
488 |
int nwords, nfound; |
fd89cfb87 Dynamic Debug: Sp... |
489 490 491 |
char *words[MAXWORDS]; nwords = ddebug_tokenize(query_string, words, MAXWORDS); |
18c216c53 dynamic_debug: ad... |
492 493 494 |
if (nwords <= 0) { pr_err("tokenize failed "); |
fd89cfb87 Dynamic Debug: Sp... |
495 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
496 497 |
} /* check flags 1st (last arg) so query is pairs of spec,val */ |
84da83a6f dyndbg: combine f... |
498 |
if (ddebug_parse_flags(words[nwords-1], &modifiers)) { |
18c216c53 dynamic_debug: ad... |
499 500 |
pr_err("flags parse failed "); |
fd89cfb87 Dynamic Debug: Sp... |
501 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
502 503 504 505 |
} if (ddebug_parse_query(words, nwords-1, &query, modname)) { pr_err("query parse failed "); |
fd89cfb87 Dynamic Debug: Sp... |
506 |
return -EINVAL; |
18c216c53 dynamic_debug: ad... |
507 |
} |
fd89cfb87 Dynamic Debug: Sp... |
508 |
/* actually go and implement the change */ |
84da83a6f dyndbg: combine f... |
509 |
nfound = ddebug_change(&query, &modifiers); |
f657fd21e dynamic_debug: Fi... |
510 |
vpr_info_dq(&query, nfound ? "applied" : "no-match"); |
85f7f6c0e dynamic_debug: pr... |
511 512 513 514 515 516 517 518 |
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. */ |
a2d375eda dyndbg: refine ex... |
519 |
static int ddebug_exec_queries(char *query, const char *modname) |
85f7f6c0e dynamic_debug: pr... |
520 521 522 523 524 525 526 527 528 529 530 531 532 |
{ 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; |
b8ccd5dee dynamic_debug: re... |
533 534 |
vpr_info("query %d: \"%s\" ", i, query); |
85f7f6c0e dynamic_debug: pr... |
535 |
|
8e59b5cfb dynamic_debug: ad... |
536 |
rc = ddebug_exec_query(query, modname); |
85f7f6c0e dynamic_debug: pr... |
537 538 539 |
if (rc < 0) { errs++; exitcode = rc; |
f657fd21e dynamic_debug: Fi... |
540 |
} else { |
85f7f6c0e dynamic_debug: pr... |
541 |
nfound += rc; |
f657fd21e dynamic_debug: Fi... |
542 |
} |
85f7f6c0e dynamic_debug: pr... |
543 544 |
i++; } |
b8ccd5dee dynamic_debug: re... |
545 546 |
vpr_info("processed %d queries, with %d matches, %d errs ", |
85f7f6c0e dynamic_debug: pr... |
547 548 549 550 551 |
i, nfound, errs); if (exitcode) return exitcode; return nfound; |
fd89cfb87 Dynamic Debug: Sp... |
552 |
} |
a2d375eda dyndbg: refine ex... |
553 554 555 556 557 558 559 560 561 562 563 564 565 566 |
/** * dynamic_debug_exec_queries - select and change dynamic-debug prints * @query: query-string described in admin-guide/dynamic-debug-howto * @modname: string containing module name, usually &module.mod_name * * This uses the >/proc/dynamic_debug/control reader, allowing module * authors to modify their dynamic-debug callsites. The modname is * canonically struct module.mod_name, but can also be null or a * module-wildcard, for example: "drm*". */ int dynamic_debug_exec_queries(const char *query, const char *modname) { int rc; |
3577afb00 dyndbg: fix use b... |
567 |
char *qry; /* writable copy of query */ |
a2d375eda dyndbg: refine ex... |
568 |
|
3577afb00 dyndbg: fix use b... |
569 570 571 572 573 574 575 |
if (!query) { pr_err("non-null query/command string expected "); return -EINVAL; } qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL); if (!qry) |
a2d375eda dyndbg: refine ex... |
576 577 578 579 580 581 582 |
return -ENOMEM; rc = ddebug_exec_queries(qry, modname); kfree(qry); return rc; } EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries); |
fd89cfb87 Dynamic Debug: Sp... |
583 |
|
431625dac dynamic_debug: us... |
584 585 586 587 588 589 590 591 |
#define PREFIX_SIZE 64 static int remaining(int wrote) { if (PREFIX_SIZE - wrote > 0) return PREFIX_SIZE - wrote; return 0; } |
640d1eaff dyndbg: avoid cal... |
592 |
static char *__dynamic_emit_prefix(const struct _ddebug *desc, char *buf) |
8ba6ebf58 Dynamic debug: Ad... |
593 |
{ |
431625dac dynamic_debug: us... |
594 595 |
int pos_after_tid; int pos = 0; |
8ba6ebf58 Dynamic debug: Ad... |
596 |
|
431625dac dynamic_debug: us... |
597 |
if (desc->flags & _DPRINTK_FLAGS_INCL_TID) { |
8ba6ebf58 Dynamic debug: Ad... |
598 |
if (in_interrupt()) |
798efc60e dev_dbg/dynamic_d... |
599 |
pos += snprintf(buf + pos, remaining(pos), "<intr> "); |
8ba6ebf58 Dynamic debug: Ad... |
600 |
else |
431625dac dynamic_debug: us... |
601 |
pos += snprintf(buf + pos, remaining(pos), "[%d] ", |
798efc60e dev_dbg/dynamic_d... |
602 |
task_pid_vnr(current)); |
8ba6ebf58 Dynamic debug: Ad... |
603 |
} |
431625dac dynamic_debug: us... |
604 605 606 |
pos_after_tid = pos; if (desc->flags & _DPRINTK_FLAGS_INCL_MODNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
607 |
desc->modname); |
431625dac dynamic_debug: us... |
608 609 |
if (desc->flags & _DPRINTK_FLAGS_INCL_FUNCNAME) pos += snprintf(buf + pos, remaining(pos), "%s:", |
798efc60e dev_dbg/dynamic_d... |
610 |
desc->function); |
431625dac dynamic_debug: us... |
611 |
if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO) |
07100be7e dynamic_debug: fi... |
612 |
pos += snprintf(buf + pos, remaining(pos), "%d:", |
798efc60e dev_dbg/dynamic_d... |
613 |
desc->lineno); |
431625dac dynamic_debug: us... |
614 615 616 617 |
if (pos - pos_after_tid) pos += snprintf(buf + pos, remaining(pos), " "); if (pos >= PREFIX_SIZE) buf[PREFIX_SIZE - 1] = '\0'; |
6c2140ee0 dynamic_debug: Co... |
618 |
|
431625dac dynamic_debug: us... |
619 |
return buf; |
6c2140ee0 dynamic_debug: Co... |
620 |
} |
640d1eaff dyndbg: avoid cal... |
621 622 623 624 625 626 |
static inline char *dynamic_emit_prefix(struct _ddebug *desc, char *buf) { if (unlikely(desc->flags & _DPRINTK_FLAGS_INCL_ANY)) return __dynamic_emit_prefix(desc, buf); return buf; } |
906d20153 dynamic_debug: ch... |
627 |
void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...) |
8ba6ebf58 Dynamic debug: Ad... |
628 629 |
{ va_list args; |
431625dac dynamic_debug: us... |
630 |
struct va_format vaf; |
640d1eaff dyndbg: avoid cal... |
631 |
char buf[PREFIX_SIZE] = ""; |
8ba6ebf58 Dynamic debug: Ad... |
632 633 634 635 636 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
637 |
|
431625dac dynamic_debug: us... |
638 639 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
640 |
|
906d20153 dynamic_debug: ch... |
641 |
printk(KERN_DEBUG "%s%pV", dynamic_emit_prefix(descriptor, buf), &vaf); |
798efc60e dev_dbg/dynamic_d... |
642 |
|
8ba6ebf58 Dynamic debug: Ad... |
643 |
va_end(args); |
8ba6ebf58 Dynamic debug: Ad... |
644 645 |
} EXPORT_SYMBOL(__dynamic_pr_debug); |
906d20153 dynamic_debug: ch... |
646 |
void __dynamic_dev_dbg(struct _ddebug *descriptor, |
cbc466355 dynamic_debug: Ad... |
647 648 649 650 |
const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; |
cbc466355 dynamic_debug: Ad... |
651 652 653 654 655 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
798efc60e dev_dbg/dynamic_d... |
656 |
|
cbc466355 dynamic_debug: Ad... |
657 658 |
vaf.fmt = fmt; vaf.va = &args; |
798efc60e dev_dbg/dynamic_d... |
659 660 |
if (!dev) { |
906d20153 dynamic_debug: ch... |
661 |
printk(KERN_DEBUG "(NULL device *): %pV", &vaf); |
798efc60e dev_dbg/dynamic_d... |
662 |
} else { |
640d1eaff dyndbg: avoid cal... |
663 |
char buf[PREFIX_SIZE] = ""; |
798efc60e dev_dbg/dynamic_d... |
664 |
|
a39d4a857 printk: add and u... |
665 |
dev_printk_emit(LOGLEVEL_DEBUG, dev, "%s%s %s: %pV", |
906d20153 dynamic_debug: ch... |
666 667 668 |
dynamic_emit_prefix(descriptor, buf), dev_driver_string(dev), dev_name(dev), &vaf); |
798efc60e dev_dbg/dynamic_d... |
669 |
} |
cbc466355 dynamic_debug: Ad... |
670 |
va_end(args); |
cbc466355 dynamic_debug: Ad... |
671 672 |
} EXPORT_SYMBOL(__dynamic_dev_dbg); |
0feefd978 dynamic_debug: fi... |
673 |
#ifdef CONFIG_NET |
906d20153 dynamic_debug: ch... |
674 675 |
void __dynamic_netdev_dbg(struct _ddebug *descriptor, const struct net_device *dev, const char *fmt, ...) |
ffa10cb47 dynamic_debug: ma... |
676 677 678 |
{ struct va_format vaf; va_list args; |
ffa10cb47 dynamic_debug: ma... |
679 680 681 682 683 |
BUG_ON(!descriptor); BUG_ON(!fmt); va_start(args, fmt); |
b004ff497 netdev_printk/dyn... |
684 |
|
ffa10cb47 dynamic_debug: ma... |
685 686 |
vaf.fmt = fmt; vaf.va = &args; |
b004ff497 netdev_printk/dyn... |
687 688 |
if (dev && dev->dev.parent) { |
640d1eaff dyndbg: avoid cal... |
689 |
char buf[PREFIX_SIZE] = ""; |
666f355f3 device and dynami... |
690 |
|
a39d4a857 printk: add and u... |
691 |
dev_printk_emit(LOGLEVEL_DEBUG, dev->dev.parent, |
906d20153 dynamic_debug: ch... |
692 693 694 695 696 697 |
"%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... |
698 |
} else if (dev) { |
906d20153 dynamic_debug: ch... |
699 700 |
printk(KERN_DEBUG "%s%s: %pV", netdev_name(dev), netdev_reg_state(dev), &vaf); |
b004ff497 netdev_printk/dyn... |
701 |
} else { |
906d20153 dynamic_debug: ch... |
702 |
printk(KERN_DEBUG "(NULL net_device): %pV", &vaf); |
b004ff497 netdev_printk/dyn... |
703 |
} |
ffa10cb47 dynamic_debug: ma... |
704 |
va_end(args); |
ffa10cb47 dynamic_debug: ma... |
705 706 |
} EXPORT_SYMBOL(__dynamic_netdev_dbg); |
0feefd978 dynamic_debug: fi... |
707 |
#endif |
923abb9d7 RDMA/core: Introd... |
708 709 710 711 712 713 714 715 716 717 718 719 720 721 |
#if IS_ENABLED(CONFIG_INFINIBAND) void __dynamic_ibdev_dbg(struct _ddebug *descriptor, const struct ib_device *ibdev, const char *fmt, ...) { struct va_format vaf; va_list args; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; if (ibdev && ibdev->dev.parent) { |
640d1eaff dyndbg: avoid cal... |
722 |
char buf[PREFIX_SIZE] = ""; |
923abb9d7 RDMA/core: Introd... |
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 |
dev_printk_emit(LOGLEVEL_DEBUG, ibdev->dev.parent, "%s%s %s %s: %pV", dynamic_emit_prefix(descriptor, buf), dev_driver_string(ibdev->dev.parent), dev_name(ibdev->dev.parent), dev_name(&ibdev->dev), &vaf); } else if (ibdev) { printk(KERN_DEBUG "%s: %pV", dev_name(&ibdev->dev), &vaf); } else { printk(KERN_DEBUG "(NULL ib_device): %pV", &vaf); } va_end(args); } EXPORT_SYMBOL(__dynamic_ibdev_dbg); #endif |
bc757f6f5 dynamic_debug: re... |
742 743 |
#define DDEBUG_STRING_SIZE 1024 static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE]; |
a648ec05b Dynamic Debug: In... |
744 745 |
static __init int ddebug_setup_query(char *str) { |
bc757f6f5 dynamic_debug: re... |
746 |
if (strlen(str) >= DDEBUG_STRING_SIZE) { |
4ad275e5c dynamic_debug: Co... |
747 748 |
pr_warn("ddebug boot param string too large "); |
a648ec05b Dynamic Debug: In... |
749 750 |
return 0; } |
bc757f6f5 dynamic_debug: re... |
751 |
strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE); |
a648ec05b Dynamic Debug: In... |
752 753 754 755 |
return 1; } __setup("ddebug_query=", ddebug_setup_query); |
e9d376f0f dynamic debug: co... |
756 |
/* |
a14e312ad dyndbg: make dynd... |
757 758 759 760 761 762 763 764 765 766 767 768 |
* Install a noop handler to make dyndbg look like a normal kernel cli param. * This avoids warnings about dyndbg being an unknown cli param when supplied * by a user. */ static __init int dyndbg_setup(char *str) { return 1; } __setup("dyndbg=", dyndbg_setup); /* |
231821d4c dynamic_debug: fi... |
769 |
* File_ops->write method for <debugfs>/dynamic_debug/control. Gathers the |
e9d376f0f dynamic debug: co... |
770 771 |
* command text from userspace, parses and executes it. */ |
7281491c5 dynamic_debug: en... |
772 |
#define USER_BUF_PAGE 4096 |
e9d376f0f dynamic debug: co... |
773 774 775 |
static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) { |
7281491c5 dynamic_debug: en... |
776 |
char *tmpbuf; |
fd89cfb87 Dynamic Debug: Sp... |
777 |
int ret; |
e9d376f0f dynamic debug: co... |
778 779 780 |
if (len == 0) return 0; |
7281491c5 dynamic_debug: en... |
781 782 783 |
if (len > USER_BUF_PAGE - 1) { pr_warn("expected <%d bytes into control ", USER_BUF_PAGE); |
e9d376f0f dynamic debug: co... |
784 |
return -E2BIG; |
7281491c5 dynamic_debug: en... |
785 |
} |
16e5c1fc3 convert a bunch o... |
786 787 788 |
tmpbuf = memdup_user_nul(ubuf, len); if (IS_ERR(tmpbuf)) return PTR_ERR(tmpbuf); |
b8ccd5dee dynamic_debug: re... |
789 790 |
vpr_info("read %d bytes from userspace ", (int)len); |
e9d376f0f dynamic debug: co... |
791 |
|
8e59b5cfb dynamic_debug: ad... |
792 |
ret = ddebug_exec_queries(tmpbuf, NULL); |
7281491c5 dynamic_debug: en... |
793 |
kfree(tmpbuf); |
85f7f6c0e dynamic_debug: pr... |
794 |
if (ret < 0) |
fd89cfb87 Dynamic Debug: Sp... |
795 |
return ret; |
e9d376f0f dynamic debug: co... |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 |
*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; |
e9d376f0f dynamic debug: co... |
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 |
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; |
e9d376f0f dynamic debug: co... |
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 |
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; |
f678ce8cc dyndbg: fix a BUG... |
891 |
struct flagsbuf flags; |
e9d376f0f dynamic debug: co... |
892 |
|
e9d376f0f dynamic debug: co... |
893 894 |
if (p == SEQ_START_TOKEN) { seq_puts(m, |
f657fd21e dynamic_debug: Fi... |
895 896 |
"# filename:lineno [module]function flags format "); |
e9d376f0f dynamic debug: co... |
897 898 |
return 0; } |
5ca7d2a6c dynamic_debug: de... |
899 |
seq_printf(m, "%s:%u [%s]%s =%s \"", |
f657fd21e dynamic_debug: Fi... |
900 901 |
trim_prefix(dp->filename), dp->lineno, iter->table->mod_name, dp->function, |
f678ce8cc dyndbg: fix a BUG... |
902 |
ddebug_describe_flags(dp->flags, &flags)); |
e9d376f0f dynamic debug: co... |
903 904 905 906 907 908 909 910 911 912 913 914 915 916 |
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) { |
e9d376f0f dynamic debug: co... |
917 918 919 920 921 922 923 924 925 |
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 }; |
e9d376f0f dynamic debug: co... |
926 927 |
static int ddebug_proc_open(struct inode *inode, struct file *file) { |
4bad78c55 lib/dynamic_debug... |
928 929 |
return seq_open_private(file, &ddebug_proc_seqops, sizeof(struct ddebug_iter)); |
e9d376f0f dynamic debug: co... |
930 931 932 933 934 935 936 937 938 939 |
} 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 }; |
239a5791f dynamic_debug: al... |
940 941 942 943 944 945 946 |
static const struct proc_ops proc_fops = { .proc_open = ddebug_proc_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = seq_release_private, .proc_write = ddebug_proc_write }; |
e9d376f0f dynamic debug: co... |
947 948 949 950 951 952 953 954 |
/* * 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; |
e9d376f0f dynamic debug: co... |
955 956 |
dt = kzalloc(sizeof(*dt), GFP_KERNEL); |
513770f54 dynamic_debug: mo... |
957 958 959 |
if (dt == NULL) { pr_err("error adding module: %s ", name); |
e9d376f0f dynamic debug: co... |
960 |
return -ENOMEM; |
513770f54 dynamic_debug: mo... |
961 |
} |
cdf6d0069 dynamic_debug: do... |
962 963 964 965 966 967 968 |
/* * For built-in modules, name lives in .rodata and is * immortal. For loaded modules, name points at the name[] * member of struct module, which lives at least as long as * this struct ddebug_table. */ dt->mod_name = name; |
e9d376f0f dynamic debug: co... |
969 |
dt->num_ddebugs = n; |
e9d376f0f dynamic debug: co... |
970 971 972 |
dt->ddebugs = tab; mutex_lock(&ddebug_lock); |
47e9f5a82 dyndbg: make ddeb... |
973 |
list_add(&dt->link, &ddebug_tables); |
e9d376f0f dynamic debug: co... |
974 |
mutex_unlock(&ddebug_lock); |
b52a95eac dyndbg: give %3u ... |
975 976 |
v2pr_info("%3u debug prints in module %s ", n, dt->mod_name); |
e9d376f0f dynamic debug: co... |
977 978 |
return 0; } |
e9d376f0f dynamic debug: co... |
979 |
|
6ab676e96 dynamic_debug: co... |
980 981 982 |
/* 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... |
983 |
{ |
b48420c1d dynamic_debug: ma... |
984 985 986 987 |
char *sep; sep = strchr(param, '.'); if (sep) { |
6ab676e96 dynamic_debug: co... |
988 |
/* needed only for ddebug_dyndbg_boot_param_cb */ |
b48420c1d dynamic_debug: ma... |
989 990 991 992 993 |
*sep = '\0'; modname = param; param = sep + 1; } if (strcmp(param, "dyndbg")) |
6ab676e96 dynamic_debug: co... |
994 |
return on_err; /* determined by caller */ |
b48420c1d dynamic_debug: ma... |
995 |
|
8e59b5cfb dynamic_debug: ad... |
996 |
ddebug_exec_queries((val ? val : "+p"), modname); |
9dbbc3b9d lib: fix spelling... |
997 |
return 0; /* query failure shouldn't stop module load */ |
b48420c1d dynamic_debug: ma... |
998 |
} |
6ab676e96 dynamic_debug: co... |
999 1000 |
/* handle both dyndbg and $module.dyndbg params at boot */ static int ddebug_dyndbg_boot_param_cb(char *param, char *val, |
ecc861705 module: add extra... |
1001 |
const char *unused, void *arg) |
b48420c1d dynamic_debug: ma... |
1002 |
{ |
6ab676e96 dynamic_debug: co... |
1003 1004 1005 1006 |
vpr_info("%s=\"%s\" ", param, val); return ddebug_dyndbg_param_cb(param, val, NULL, 0); } |
b48420c1d dynamic_debug: ma... |
1007 |
|
6ab676e96 dynamic_debug: co... |
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 |
/* * 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... |
1018 |
} |
e9d376f0f dynamic debug: co... |
1019 1020 1021 |
static void ddebug_table_free(struct ddebug_table *dt) { list_del_init(&dt->link); |
e9d376f0f dynamic debug: co... |
1022 1023 1024 1025 1026 1027 1028 |
kfree(dt); } /* * Called in response to a module being unloaded. Removes * any ddebug_table's which point at the module. */ |
ff49d74ad module: initializ... |
1029 |
int ddebug_remove_module(const char *mod_name) |
e9d376f0f dynamic debug: co... |
1030 1031 1032 |
{ struct ddebug_table *dt, *nextdt; int ret = -ENOENT; |
481c0e33f dyndbg: refine de... |
1033 1034 |
v2pr_info("removing module \"%s\" ", mod_name); |
e9d376f0f dynamic debug: co... |
1035 1036 1037 |
mutex_lock(&ddebug_lock); list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) { |
4573fe154 dynamic_debug: us... |
1038 |
if (dt->mod_name == mod_name) { |
e9d376f0f dynamic debug: co... |
1039 1040 |
ddebug_table_free(dt); ret = 0; |
4573fe154 dynamic_debug: us... |
1041 |
break; |
e9d376f0f dynamic debug: co... |
1042 1043 1044 1045 1046 |
} } mutex_unlock(&ddebug_lock); return ret; } |
e9d376f0f dynamic debug: co... |
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 |
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... |
1059 |
static __initdata int ddebug_init_success; |
239a5791f dynamic_debug: al... |
1060 |
static int __init dynamic_debug_init_control(void) |
e9d376f0f dynamic debug: co... |
1061 |
{ |
239a5791f dynamic_debug: al... |
1062 1063 |
struct proc_dir_entry *procfs_dir; struct dentry *debugfs_dir; |
6a5c083de Dynamic Debug: In... |
1064 1065 1066 |
if (!ddebug_init_success) return -ENODEV; |
e9d376f0f dynamic debug: co... |
1067 |
|
239a5791f dynamic_debug: al... |
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 |
/* Create the control file in debugfs if it is enabled */ if (debugfs_initialized()) { debugfs_dir = debugfs_create_dir("dynamic_debug", NULL); debugfs_create_file("control", 0644, debugfs_dir, NULL, &ddebug_proc_fops); } /* Also create the control file in procfs */ procfs_dir = proc_mkdir("dynamic_debug", NULL); if (procfs_dir) proc_create("control", 0644, procfs_dir, &proc_fops); |
9fd714cd7 lib: dynamic_debu... |
1079 |
|
6a5c083de Dynamic Debug: In... |
1080 1081 1082 1083 1084 1085 1086 |
return 0; } static int __init dynamic_debug_init(void) { struct _ddebug *iter, *iter_start; const char *modname = NULL; |
b48420c1d dynamic_debug: ma... |
1087 |
char *cmdline; |
6a5c083de Dynamic Debug: In... |
1088 |
int ret = 0; |
410769276 dynamic_debug: pr... |
1089 |
int n = 0, entries = 0, modct = 0; |
6a5c083de Dynamic Debug: In... |
1090 |
|
e5ebffe18 dyndbg: rename __... |
1091 |
if (&__start___dyndbg == &__stop___dyndbg) { |
ceabef7dd dynamic_debug: ad... |
1092 1093 1094 1095 1096 1097 1098 1099 1100 |
if (IS_ENABLED(CONFIG_DYNAMIC_DEBUG)) { pr_warn("_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build "); return 1; } pr_info("Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build "); ddebug_init_success = 1; return 0; |
b5b78f838 dynamic_debug: ea... |
1101 |
} |
e5ebffe18 dyndbg: rename __... |
1102 |
iter = __start___dyndbg; |
b5b78f838 dynamic_debug: ea... |
1103 1104 |
modname = iter->modname; iter_start = iter; |
e5ebffe18 dyndbg: rename __... |
1105 |
for (; iter < __stop___dyndbg; iter++) { |
410769276 dynamic_debug: pr... |
1106 |
entries++; |
b5b78f838 dynamic_debug: ea... |
1107 |
if (strcmp(modname, iter->modname)) { |
410769276 dynamic_debug: pr... |
1108 |
modct++; |
b5b78f838 dynamic_debug: ea... |
1109 1110 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1111 |
goto out_err; |
b5b78f838 dynamic_debug: ea... |
1112 1113 1114 |
n = 0; modname = iter->modname; iter_start = iter; |
e9d376f0f dynamic debug: co... |
1115 |
} |
b5b78f838 dynamic_debug: ea... |
1116 |
n++; |
e9d376f0f dynamic debug: co... |
1117 |
} |
b5b78f838 dynamic_debug: ea... |
1118 1119 |
ret = ddebug_add_module(iter_start, n, modname); if (ret) |
af442399f dynamic_debug: si... |
1120 |
goto out_err; |
a648ec05b Dynamic Debug: In... |
1121 |
|
af442399f dynamic_debug: si... |
1122 |
ddebug_init_success = 1; |
7af566282 dyndbg: display K... |
1123 1124 1125 1126 |
vpr_info("%d prdebugs in %d modules, %d KiB in ddebug tables, %d kiB in __dyndbg section ", entries, modct, (int)((modct * sizeof(struct ddebug_table)) >> 10), (int)((entries * sizeof(struct _ddebug)) >> 10)); |
af442399f dynamic_debug: si... |
1127 1128 |
/* apply ddebug_query boot param, dont unload tables on err */ |
a648ec05b Dynamic Debug: In... |
1129 |
if (ddebug_setup_string[0] != '\0') { |
f657fd21e dynamic_debug: Fi... |
1130 1131 |
pr_warn("ddebug_query param name is deprecated, change it to dyndbg "); |
8e59b5cfb dynamic_debug: ad... |
1132 |
ret = ddebug_exec_queries(ddebug_setup_string, NULL); |
85f7f6c0e dynamic_debug: pr... |
1133 |
if (ret < 0) |
f657fd21e dynamic_debug: Fi... |
1134 1135 |
pr_warn("Invalid ddebug boot param %s ", |
4ad275e5c dynamic_debug: Co... |
1136 |
ddebug_setup_string); |
a648ec05b Dynamic Debug: In... |
1137 |
else |
85f7f6c0e dynamic_debug: pr... |
1138 1139 |
pr_info("%d changes by ddebug_query ", ret); |
a648ec05b Dynamic Debug: In... |
1140 |
} |
b48420c1d dynamic_debug: ma... |
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 |
/* 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... |
1151 |
0, 0, 0, NULL, &ddebug_dyndbg_boot_param_cb); |
b48420c1d dynamic_debug: ma... |
1152 |
kfree(cmdline); |
af442399f dynamic_debug: si... |
1153 |
return 0; |
a648ec05b Dynamic Debug: In... |
1154 |
|
af442399f dynamic_debug: si... |
1155 1156 |
out_err: ddebug_remove_all_tables(); |
e9d376f0f dynamic debug: co... |
1157 1158 |
return 0; } |
6a5c083de Dynamic Debug: In... |
1159 |
/* Allow early initialization for boot messages via boot param */ |
3ec5652ab dynamic_debug: in... |
1160 |
early_initcall(dynamic_debug_init); |
b48420c1d dynamic_debug: ma... |
1161 |
|
6a5c083de Dynamic Debug: In... |
1162 |
/* Debugfs setup must be done later */ |
239a5791f dynamic_debug: al... |
1163 |
fs_initcall(dynamic_debug_init_control); |