autoconfiguration.
Ranges are in pairs (memory base and size).
- dynamic_printk Enables pr_debug()/dev_dbg() calls if
- CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled.
- These can also be switched on/off via
- <debugfs>/dynamic_printk/modules
-
print-fatal-signals=
[KNL] debug: print fatal signals
print-fatal-signals=1: print segfault info to
VMLINUX_SYMBOL(__start___tracepoints) = .; \
*(__tracepoints) \
VMLINUX_SYMBOL(__stop___tracepoints) = .; \
+ /* implement dynamic printk debug */ \
+ . = ALIGN(8); \
+ VMLINUX_SYMBOL(__start___verbose) = .; \
+ *(__verbose) \
+ VMLINUX_SYMBOL(__stop___verbose) = .; \
LIKELY_PROFILE() \
BRANCH_PROFILE()
CPU_DISCARD(init.data) \
CPU_DISCARD(init.rodata) \
MEM_DISCARD(init.data) \
- MEM_DISCARD(init.rodata) \
- /* implement dynamic printk debug */ \
- VMLINUX_SYMBOL(__start___verbose_strings) = .; \
- *(__verbose_strings) \
- VMLINUX_SYMBOL(__stop___verbose_strings) = .; \
- . = ALIGN(8); \
- VMLINUX_SYMBOL(__start___verbose) = .; \
- *(__verbose) \
- VMLINUX_SYMBOL(__stop___verbose) = .;
+ MEM_DISCARD(init.rodata)
#define INIT_TEXT \
*(.init.text) \
#if defined(DEBUG)
#define dev_dbg(dev, format, arg...) \
dev_printk(KERN_DEBUG , dev , format , ## arg)
-#elif defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
+#elif defined(CONFIG_DYNAMIC_DEBUG)
#define dev_dbg(dev, format, ...) do { \
dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
} while (0)
--- /dev/null
+#ifndef _DYNAMIC_DEBUG_H
+#define _DYNAMIC_DEBUG_H
+
+/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
+ * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
+ * use independent hash functions, to reduce the chance of false positives.
+ */
+extern long long dynamic_debug_enabled;
+extern long long dynamic_debug_enabled2;
+
+/*
+ * An instance of this structure is created in a special
+ * ELF section at every dynamic debug callsite. At runtime,
+ * the special section is treated as an array of these.
+ */
+struct _ddebug {
+ /*
+ * These fields are used to drive the user interface
+ * for selecting and displaying debug callsites.
+ */
+ const char *modname;
+ const char *function;
+ const char *filename;
+ const char *format;
+ char primary_hash;
+ char secondary_hash;
+ unsigned int lineno:24;
+ /*
+ * The flags field controls the behaviour at the callsite.
+ * The bits here are changed dynamically when the user
+ * writes commands to <debugfs>/dynamic_debug/ddebug
+ */
+#define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */
+#define _DPRINTK_FLAGS_DEFAULT 0
+ unsigned int flags:8;
+} __attribute__((aligned(8)));
+
+
+int ddebug_add_module(struct _ddebug *tab, unsigned int n,
+ const char *modname);
+
+#if defined(CONFIG_DYNAMIC_DEBUG)
+extern int ddebug_remove_module(char *mod_name);
+
+#define __dynamic_dbg_enabled(dd) ({ \
+ int __ret = 0; \
+ if (unlikely((dynamic_debug_enabled & (1LL << DEBUG_HASH)) && \
+ (dynamic_debug_enabled2 & (1LL << DEBUG_HASH2)))) \
+ if (unlikely(dd.flags)) \
+ __ret = 1; \
+ __ret; })
+
+#define dynamic_pr_debug(fmt, ...) do { \
+ static struct _ddebug descriptor \
+ __used \
+ __attribute__((section("__verbose"), aligned(8))) = \
+ { KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \
+ DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \
+ if (__dynamic_dbg_enabled(descriptor)) \
+ printk(KERN_DEBUG KBUILD_MODNAME ":" fmt, \
+ ##__VA_ARGS__); \
+ } while (0)
+
+
+#define dynamic_dev_dbg(dev, fmt, ...) do { \
+ static struct _ddebug descriptor \
+ __used \
+ __attribute__((section("__verbose"), aligned(8))) = \
+ { KBUILD_MODNAME, __func__, __FILE__, fmt, DEBUG_HASH, \
+ DEBUG_HASH2, __LINE__, _DPRINTK_FLAGS_DEFAULT }; \
+ if (__dynamic_dbg_enabled(descriptor)) \
+ dev_printk(KERN_DEBUG, dev, \
+ KBUILD_MODNAME ": " fmt, \
+ ##__VA_ARGS__); \
+ } while (0)
+
+#else
+
+static inline int ddebug_remove_module(char *mod)
+{
+ return 0;
+}
+
+#define dynamic_pr_debug(fmt, ...) do { } while (0)
+#define dynamic_dev_dbg(dev, format, ...) do { } while (0)
+#endif
+
+#endif
+++ /dev/null
-#ifndef _DYNAMIC_PRINTK_H
-#define _DYNAMIC_PRINTK_H
-
-#define DYNAMIC_DEBUG_HASH_BITS 6
-#define DEBUG_HASH_TABLE_SIZE (1 << DYNAMIC_DEBUG_HASH_BITS)
-
-#define TYPE_BOOLEAN 1
-
-#define DYNAMIC_ENABLED_ALL 0
-#define DYNAMIC_ENABLED_NONE 1
-#define DYNAMIC_ENABLED_SOME 2
-
-extern int dynamic_enabled;
-
-/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
- * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
- * use independent hash functions, to reduce the chance of false positives.
- */
-extern long long dynamic_printk_enabled;
-extern long long dynamic_printk_enabled2;
-
-struct mod_debug {
- char *modname;
- char *logical_modname;
- char *flag_names;
- int type;
- int hash;
- int hash2;
-} __attribute__((aligned(8)));
-
-int register_dynamic_debug_module(char *mod_name, int type, char *share_name,
- char *flags, int hash, int hash2);
-
-#if defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
-extern int unregister_dynamic_debug_module(char *mod_name);
-extern int __dynamic_dbg_enabled_helper(char *modname, int type,
- int value, int hash);
-
-#define __dynamic_dbg_enabled(module, type, value, level, hash) ({ \
- int __ret = 0; \
- if (unlikely((dynamic_printk_enabled & (1LL << DEBUG_HASH)) && \
- (dynamic_printk_enabled2 & (1LL << DEBUG_HASH2)))) \
- __ret = __dynamic_dbg_enabled_helper(module, type, \
- value, hash);\
- __ret; })
-
-#define dynamic_pr_debug(fmt, ...) do { \
- static char mod_name[] \
- __attribute__((section("__verbose_strings"))) \
- = KBUILD_MODNAME; \
- static struct mod_debug descriptor \
- __used \
- __attribute__((section("__verbose"), aligned(8))) = \
- { mod_name, mod_name, NULL, TYPE_BOOLEAN, DEBUG_HASH, DEBUG_HASH2 };\
- if (__dynamic_dbg_enabled(KBUILD_MODNAME, TYPE_BOOLEAN, \
- 0, 0, DEBUG_HASH)) \
- printk(KERN_DEBUG KBUILD_MODNAME ":" fmt, \
- ##__VA_ARGS__); \
- } while (0)
-
-#define dynamic_dev_dbg(dev, format, ...) do { \
- static char mod_name[] \
- __attribute__((section("__verbose_strings"))) \
- = KBUILD_MODNAME; \
- static struct mod_debug descriptor \
- __used \
- __attribute__((section("__verbose"), aligned(8))) = \
- { mod_name, mod_name, NULL, TYPE_BOOLEAN, DEBUG_HASH, DEBUG_HASH2 };\
- if (__dynamic_dbg_enabled(KBUILD_MODNAME, TYPE_BOOLEAN, \
- 0, 0, DEBUG_HASH)) \
- dev_printk(KERN_DEBUG, dev, \
- KBUILD_MODNAME ": " format, \
- ##__VA_ARGS__); \
- } while (0)
-
-#else
-
-static inline int unregister_dynamic_debug_module(const char *mod_name)
-{
- return 0;
-}
-static inline int __dynamic_dbg_enabled_helper(char *modname, int type,
- int value, int hash)
-{
- return 0;
-}
-
-#define __dynamic_dbg_enabled(module, type, value, level, hash) ({ 0; })
-#define dynamic_pr_debug(fmt, ...) do { } while (0)
-#define dynamic_dev_dbg(dev, format, ...) do { } while (0)
-#endif
-
-#endif
#include <linux/log2.h>
#include <linux/typecheck.h>
#include <linux/ratelimit.h>
-#include <linux/dynamic_printk.h>
+#include <linux/dynamic_debug.h>
#include <asm/byteorder.h>
#include <asm/bug.h>
#if defined(DEBUG)
#define pr_debug(fmt, ...) \
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
-#elif defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
+#elif defined(CONFIG_DYNAMIC_DEBUG)
#define pr_debug(fmt, ...) do { \
dynamic_pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
} while (0)
mutex_lock(&module_mutex);
/* Store the name of the last unloaded module for diagnostic purposes */
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
- unregister_dynamic_debug_module(mod->name);
+ ddebug_remove_module(mod->name);
free_module(mod);
out:
}
#endif /* CONFIG_KALLSYMS */
-static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num)
+static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
{
-#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
- unsigned int i;
-
- for (i = 0; i < num; i++) {
- register_dynamic_debug_module(debug[i].modname,
- debug[i].type,
- debug[i].logical_modname,
- debug[i].flag_names,
- debug[i].hash, debug[i].hash2);
- }
-#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
+#ifdef CONFIG_DYNAMIC_DEBUG
+ if (ddebug_add_module(debug, num, debug->modname))
+ printk(KERN_ERR "dynamic debug error adding module: %s\n",
+ debug->modname);
+#endif
}
static void *module_alloc_update_bounds(unsigned long size)
add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
if (!mod->taints) {
- struct mod_debug *debug;
+ struct _ddebug *debug;
unsigned int num_debug;
debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
sizeof(*debug), &num_debug);
- dynamic_printk_setup(debug, num_debug);
+ if (debug)
+ dynamic_debug_setup(debug, num_debug);
}
/* sechdrs[0].sh_size is always zero */
Say N if you are unsure.
-config DYNAMIC_PRINTK_DEBUG
+config DYNAMIC_DEBUG
bool "Enable dynamic printk() call support"
default n
depends on PRINTK
obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o
-obj-$(CONFIG_DYNAMIC_PRINTK_DEBUG) += dynamic_printk.o
+obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o
hostprogs-y := gen_crc32table
clean-files := crc32table.h
--- /dev/null
+/*
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kallsyms.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/list.h>
+#include <linux/sysctl.h>
+#include <linux/ctype.h>
+#include <linux/uaccess.h>
+#include <linux/dynamic_debug.h>
+#include <linux/debugfs.h>
+
+extern struct _ddebug __start___verbose[];
+extern struct _ddebug __stop___verbose[];
+
+/* dynamic_debug_enabled, and dynamic_debug_enabled2 are bitmasks in which
+ * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
+ * use independent hash functions, to reduce the chance of false positives.
+ */
+long long dynamic_debug_enabled;
+EXPORT_SYMBOL_GPL(dynamic_debug_enabled);
+long long dynamic_debug_enabled2;
+EXPORT_SYMBOL_GPL(dynamic_debug_enabled2);
+
+struct ddebug_table {
+ struct list_head link;
+ char *mod_name;
+ unsigned int num_ddebugs;
+ unsigned int num_enabled;
+ 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);
+static int verbose = 0;
+
+/* Return the last part of a pathname */
+static inline const char *basename(const char *path)
+{
+ const char *tail = strrchr(path, '/');
+ return tail ? tail+1 : path;
+}
+
+/* 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;
+
+ BUG_ON(maxlen < 4);
+ if (dp->flags & _DPRINTK_FLAGS_PRINT)
+ *p++ = 'p';
+ if (p == buf)
+ *p++ = '-';
+ *p = '\0';
+
+ return buf;
+}
+
+/*
+ * must be called with ddebug_lock held
+ */
+
+static int disabled_hash(char hash, bool first_table)
+{
+ struct ddebug_table *dt;
+ char table_hash_value;
+
+ list_for_each_entry(dt, &ddebug_tables, link) {
+ if (first_table)
+ table_hash_value = dt->ddebugs->primary_hash;
+ else
+ table_hash_value = dt->ddebugs->secondary_hash;
+ if (dt->num_enabled && (hash == table_hash_value))
+ return 0;
+ }
+ return 1;
+}
+
+/*
+ * Search the tables for _ddebug's which match the given
+ * `query' and apply the `flags' and `mask' to them. Tells
+ * the user which ddebug's were changed, or whether none
+ * were matched.
+ */
+static void ddebug_change(const struct ddebug_query *query,
+ unsigned int flags, unsigned int mask)
+{
+ int i;
+ struct ddebug_table *dt;
+ unsigned int newflags;
+ unsigned int nfound = 0;
+ char flagbuf[8];
+
+ /* search for matching ddebugs */
+ mutex_lock(&ddebug_lock);
+ list_for_each_entry(dt, &ddebug_tables, link) {
+
+ /* match against the module name */
+ if (query->module != NULL &&
+ strcmp(query->module, dt->mod_name))
+ continue;
+
+ for (i = 0 ; i < dt->num_ddebugs ; i++) {
+ struct _ddebug *dp = &dt->ddebugs[i];
+
+ /* match against the source filename */
+ if (query->filename != NULL &&
+ strcmp(query->filename, dp->filename) &&
+ strcmp(query->filename, basename(dp->filename)))
+ continue;
+
+ /* match against the function */
+ if (query->function != NULL &&
+ strcmp(query->function, dp->function))
+ continue;
+
+ /* match against the format */
+ if (query->format != NULL &&
+ strstr(dp->format, query->format) == NULL)
+ 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;
+
+ if (!newflags)
+ dt->num_enabled--;
+ else if (!dp-flags)
+ dt->num_enabled++;
+ dp->flags = newflags;
+ if (newflags) {
+ dynamic_debug_enabled |=
+ (1LL << dp->primary_hash);
+ dynamic_debug_enabled2 |=
+ (1LL << dp->secondary_hash);
+ } else {
+ if (disabled_hash(dp->primary_hash, true))
+ dynamic_debug_enabled &=
+ ~(1LL << dp->primary_hash);
+ if (disabled_hash(dp->secondary_hash, false))
+ dynamic_debug_enabled2 &=
+ ~(1LL << dp->secondary_hash);
+ }
+ if (verbose)
+ printk(KERN_INFO
+ "ddebug: changed %s:%d [%s]%s %s\n",
+ dp->filename, dp->lineno,
+ dt->mod_name, dp->function,
+ ddebug_describe_flags(dp, flagbuf,
+ sizeof(flagbuf)));
+ }
+ }
+ mutex_unlock(&ddebug_lock);
+
+ if (!nfound && verbose)
+ printk(KERN_INFO "ddebug: no matches for query\n");
+}
+
+/*
+ * Wrapper around strsep() to collapse the multiple empty tokens
+ * that it returns when fed sequences of separator characters.
+ * Now, if we had strtok_r()...
+ */
+static inline char *nearly_strtok_r(char **p, const char *sep)
+{
+ char *r;
+
+ while ((r = strsep(p, sep)) != NULL && *r == '\0')
+ ;
+ return r;
+}
+
+/*
+ * Split the buffer `buf' into space-separated words.
+ * Return the number of such words or <0 on error.
+ */
+static int ddebug_tokenize(char *buf, char *words[], int maxwords)
+{
+ int nwords = 0;
+
+ while (nwords < maxwords &&
+ (words[nwords] = nearly_strtok_r(&buf, " \t\r\n")) != NULL)
+ nwords++;
+ if (buf)
+ return -EINVAL; /* ran out of words[] before bytes */
+
+ if (verbose) {
+ int i;
+ printk(KERN_INFO "%s: split into words:", __func__);
+ for (i = 0 ; i < nwords ; i++)
+ printk(" \"%s\"", words[i]);
+ printk("\n");
+ }
+
+ 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);
+ return end == NULL || end == str || *end != '\0' ? -EINVAL : 0;
+}
+
+/*
+ * Undo octal escaping in a string, inplace. This is useful to
+ * allow the user to express a query which matches a format
+ * containing embedded spaces.
+ */
+#define isodigit(c) ((c) >= '0' && (c) <= '7')
+static char *unescape(char *str)
+{
+ char *in = str;
+ char *out = str;
+
+ while (*in) {
+ if (*in == '\\') {
+ if (in[1] == '\\') {
+ *out++ = '\\';
+ in += 2;
+ continue;
+ } else if (in[1] == 't') {
+ *out++ = '\t';
+ in += 2;
+ continue;
+ } else if (in[1] == 'n') {
+ *out++ = '\n';
+ in += 2;
+ continue;
+ } else if (isodigit(in[1]) &&
+ isodigit(in[2]) &&
+ isodigit(in[3])) {
+ *out++ = ((in[1] - '0')<<6) |
+ ((in[2] - '0')<<3) |
+ (in[3] - '0');
+ in += 4;
+ continue;
+ }
+ }
+ *out++ = *in++;
+ }
+ *out = '\0';
+
+ return str;
+}
+
+/*
+ * 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
+ */
+static int ddebug_parse_query(char *words[], int nwords,
+ struct ddebug_query *query)
+{
+ unsigned int i;
+
+ /* check we have an even number of words */
+ if (nwords % 2 != 0)
+ return -EINVAL;
+ memset(query, 0, sizeof(*query));
+
+ for (i = 0 ; i < nwords ; i += 2) {
+ if (!strcmp(words[i], "func"))
+ query->function = words[i+1];
+ else if (!strcmp(words[i], "file"))
+ query->filename = words[i+1];
+ else if (!strcmp(words[i], "module"))
+ query->module = words[i+1];
+ else if (!strcmp(words[i], "format"))
+ query->format = unescape(words[i+1]);
+ else if (!strcmp(words[i], "line")) {
+ char *first = words[i+1];
+ char *last = strchr(first, '-');
+ if (last)
+ *last++ = '\0';
+ if (parse_lineno(first, &query->first_lineno) < 0)
+ return -EINVAL;
+ if (last != NULL) {
+ /* range <first>-<last> */
+ if (parse_lineno(last, &query->last_lineno) < 0)
+ return -EINVAL;
+ } else {
+ query->last_lineno = query->first_lineno;
+ }
+ } else {
+ if (verbose)
+ printk(KERN_ERR "%s: unknown keyword \"%s\"\n",
+ __func__, words[i]);
+ return -EINVAL;
+ }
+ }
+
+ if (verbose)
+ printk(KERN_INFO "%s: q->function=\"%s\" q->filename=\"%s\" "
+ "q->module=\"%s\" q->format=\"%s\" q->lineno=%u-%u\n",
+ __func__, query->function, query->filename,
+ query->module, query->format, query->first_lineno,
+ query->last_lineno);
+
+ 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;
+ int op = '=';
+
+ switch (*str) {
+ case '+':
+ case '-':
+ case '=':
+ op = *str++;
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (verbose)
+ printk(KERN_INFO "%s: op='%c'\n", __func__, op);
+
+ for ( ; *str ; ++str) {
+ switch (*str) {
+ case 'p':
+ flags |= _DPRINTK_FLAGS_PRINT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ if (flags == 0)
+ return -EINVAL;
+ if (verbose)
+ printk(KERN_INFO "%s: flags=0x%x\n", __func__, flags);
+
+ /* 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;
+ }
+ if (verbose)
+ printk(KERN_INFO "%s: *flagsp=0x%x *maskp=0x%x\n",
+ __func__, *flagsp, *maskp);
+ return 0;
+}
+
+/*
+ * File_ops->write method for <debugfs>/dynamic_debug/conrol. Gathers the
+ * command text from userspace, parses and executes it.
+ */
+static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ unsigned int flags = 0, mask = 0;
+ struct ddebug_query query;
+#define MAXWORDS 9
+ int nwords;
+ char *words[MAXWORDS];
+ char tmpbuf[256];
+
+ if (len == 0)
+ return 0;
+ /* we don't check *offp -- multiple writes() are allowed */
+ if (len > sizeof(tmpbuf)-1)
+ return -E2BIG;
+ if (copy_from_user(tmpbuf, ubuf, len))
+ return -EFAULT;
+ tmpbuf[len] = '\0';
+ if (verbose)
+ printk(KERN_INFO "%s: read %d bytes from userspace\n",
+ __func__, (int)len);
+
+ nwords = ddebug_tokenize(tmpbuf, words, MAXWORDS);
+ if (nwords < 0)
+ return -EINVAL;
+ if (ddebug_parse_query(words, nwords-1, &query))
+ return -EINVAL;
+ if (ddebug_parse_flags(words[nwords-1], &flags, &mask))
+ return -EINVAL;
+
+ /* actually go and implement the change */
+ ddebug_change(&query, flags, mask);
+
+ *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;
+
+ if (verbose)
+ printk(KERN_INFO "%s: called m=%p *pos=%lld\n",
+ __func__, m, (unsigned long long)*pos);
+
+ 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;
+
+ if (verbose)
+ printk(KERN_INFO "%s: called m=%p p=%p *pos=%lld\n",
+ __func__, m, p, (unsigned long long)*pos);
+
+ 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;
+ char flagsbuf[8];
+
+ if (verbose)
+ printk(KERN_INFO "%s: called m=%p p=%p\n",
+ __func__, m, p);
+
+ if (p == SEQ_START_TOKEN) {
+ seq_puts(m,
+ "# filename:lineno [module]function flags format\n");
+ return 0;
+ }
+
+ seq_printf(m, "%s:%u [%s]%s %s \"",
+ dp->filename, dp->lineno,
+ iter->table->mod_name, dp->function,
+ ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
+ seq_escape(m, dp->format, "\t\r\n\"");
+ seq_puts(m, "\"\n");
+
+ 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)
+{
+ if (verbose)
+ printk(KERN_INFO "%s: called m=%p p=%p\n",
+ __func__, m, p);
+ 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
+};
+
+/*
+ * 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.
+ */
+static int ddebug_proc_open(struct inode *inode, struct file *file)
+{
+ struct ddebug_iter *iter;
+ int err;
+
+ if (verbose)
+ printk(KERN_INFO "%s: called\n", __func__);
+
+ iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+ if (iter == NULL)
+ return -ENOMEM;
+
+ err = seq_open(file, &ddebug_proc_seqops);
+ if (err) {
+ kfree(iter);
+ return err;
+ }
+ ((struct seq_file *) file->private_data)->private = iter;
+ 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;
+ dt->num_enabled = 0;
+ dt->ddebugs = tab;
+
+ mutex_lock(&ddebug_lock);
+ list_add_tail(&dt->link, &ddebug_tables);
+ mutex_unlock(&ddebug_lock);
+
+ if (verbose)
+ printk(KERN_INFO "%u debug prints in module %s\n",
+ n, dt->mod_name);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ddebug_add_module);
+
+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.
+ */
+int ddebug_remove_module(char *mod_name)
+{
+ struct ddebug_table *dt, *nextdt;
+ int ret = -ENOENT;
+
+ if (verbose)
+ printk(KERN_INFO "%s: removing module \"%s\"\n",
+ __func__, mod_name);
+
+ 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);
+}
+
+static int __init dynamic_debug_init(void)
+{
+ struct dentry *dir, *file;
+ struct _ddebug *iter, *iter_start;
+ const char *modname = NULL;
+ int ret = 0;
+ int n = 0;
+
+ 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;
+ }
+ if (__start___verbose != __stop___verbose) {
+ iter = __start___verbose;
+ modname = iter->modname;
+ iter_start = iter;
+ for (; iter < __stop___verbose; iter++) {
+ if (strcmp(modname, iter->modname)) {
+ ret = ddebug_add_module(iter_start, n, modname);
+ if (ret)
+ goto out_free;
+ n = 0;
+ modname = iter->modname;
+ iter_start = iter;
+ }
+ n++;
+ }
+ ret = ddebug_add_module(iter_start, n, modname);
+ }
+out_free:
+ if (ret) {
+ ddebug_remove_all_tables();
+ debugfs_remove(dir);
+ debugfs_remove(file);
+ }
+ return 0;
+}
+module_init(dynamic_debug_init);
+++ /dev/null
-/*
- * lib/dynamic_printk.c
- *
- * make pr_debug()/dev_dbg() calls runtime configurable based upon their
- * their source module.
- *
- * Copyright (C) 2008 Red Hat, Inc., Jason Baron <jbaron@redhat.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/uaccess.h>
-#include <linux/seq_file.h>
-#include <linux/debugfs.h>
-#include <linux/fs.h>
-
-extern struct mod_debug __start___verbose[];
-extern struct mod_debug __stop___verbose[];
-
-struct debug_name {
- struct hlist_node hlist;
- struct hlist_node hlist2;
- int hash1;
- int hash2;
- char *name;
- int enable;
- int type;
-};
-
-static int nr_entries;
-static int num_enabled;
-int dynamic_enabled = DYNAMIC_ENABLED_NONE;
-static struct hlist_head module_table[DEBUG_HASH_TABLE_SIZE] =
- { [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
-static struct hlist_head module_table2[DEBUG_HASH_TABLE_SIZE] =
- { [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
-static DECLARE_MUTEX(debug_list_mutex);
-
-/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
- * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
- * use independent hash functions, to reduce the chance of false positives.
- */
-long long dynamic_printk_enabled;
-EXPORT_SYMBOL_GPL(dynamic_printk_enabled);
-long long dynamic_printk_enabled2;
-EXPORT_SYMBOL_GPL(dynamic_printk_enabled2);
-
-/* returns the debug module pointer. */
-static struct debug_name *find_debug_module(char *module_name)
-{
- int i;
- struct hlist_head *head;
- struct hlist_node *node;
- struct debug_name *element;
-
- element = NULL;
- for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
- head = &module_table[i];
- hlist_for_each_entry_rcu(element, node, head, hlist)
- if (!strcmp(element->name, module_name))
- return element;
- }
- return NULL;
-}
-
-/* returns the debug module pointer. */
-static struct debug_name *find_debug_module_hash(char *module_name, int hash)
-{
- struct hlist_head *head;
- struct hlist_node *node;
- struct debug_name *element;
-
- element = NULL;
- head = &module_table[hash];
- hlist_for_each_entry_rcu(element, node, head, hlist)
- if (!strcmp(element->name, module_name))
- return element;
- return NULL;
-}
-
-/* caller must hold mutex*/
-static int __add_debug_module(char *mod_name, int hash, int hash2)
-{
- struct debug_name *new;
- char *module_name;
- int ret = 0;
-
- if (find_debug_module(mod_name)) {
- ret = -EINVAL;
- goto out;
- }
- module_name = kmalloc(strlen(mod_name) + 1, GFP_KERNEL);
- if (!module_name) {
- ret = -ENOMEM;
- goto out;
- }
- module_name = strcpy(module_name, mod_name);
- module_name[strlen(mod_name)] = '\0';
- new = kzalloc(sizeof(struct debug_name), GFP_KERNEL);
- if (!new) {
- kfree(module_name);
- ret = -ENOMEM;
- goto out;
- }
- INIT_HLIST_NODE(&new->hlist);
- INIT_HLIST_NODE(&new->hlist2);
- new->name = module_name;
- new->hash1 = hash;
- new->hash2 = hash2;
- hlist_add_head_rcu(&new->hlist, &module_table[hash]);
- hlist_add_head_rcu(&new->hlist2, &module_table2[hash2]);
- nr_entries++;
-out:
- return ret;
-}
-
-int unregister_dynamic_debug_module(char *mod_name)
-{
- struct debug_name *element;
- int ret = 0;
-
- down(&debug_list_mutex);
- element = find_debug_module(mod_name);
- if (!element) {
- ret = -EINVAL;
- goto out;
- }
- hlist_del_rcu(&element->hlist);
- hlist_del_rcu(&element->hlist2);
- synchronize_rcu();
- kfree(element->name);
- if (element->enable)
- num_enabled--;
- kfree(element);
- nr_entries--;
-out:
- up(&debug_list_mutex);
- return ret;
-}
-EXPORT_SYMBOL_GPL(unregister_dynamic_debug_module);
-
-int register_dynamic_debug_module(char *mod_name, int type, char *share_name,
- char *flags, int hash, int hash2)
-{
- struct debug_name *elem;
- int ret = 0;
-
- down(&debug_list_mutex);
- elem = find_debug_module(mod_name);
- if (!elem) {
- if (__add_debug_module(mod_name, hash, hash2))
- goto out;
- elem = find_debug_module(mod_name);
- if (dynamic_enabled == DYNAMIC_ENABLED_ALL &&
- !strcmp(mod_name, share_name)) {
- elem->enable = true;
- num_enabled++;
- }
- }
- elem->type |= type;
-out:
- up(&debug_list_mutex);
- return ret;
-}
-EXPORT_SYMBOL_GPL(register_dynamic_debug_module);
-
-int __dynamic_dbg_enabled_helper(char *mod_name, int type, int value, int hash)
-{
- struct debug_name *elem;
- int ret = 0;
-
- if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
- return 1;
- rcu_read_lock();
- elem = find_debug_module_hash(mod_name, hash);
- if (elem && elem->enable)
- ret = 1;
- rcu_read_unlock();
- return ret;
-}
-EXPORT_SYMBOL_GPL(__dynamic_dbg_enabled_helper);
-
-static void set_all(bool enable)
-{
- struct debug_name *e;
- struct hlist_node *node;
- int i;
- long long enable_mask;
-
- for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
- if (module_table[i].first != NULL) {
- hlist_for_each_entry(e, node, &module_table[i], hlist) {
- e->enable = enable;
- }
- }
- }
- if (enable)
- enable_mask = ULLONG_MAX;
- else
- enable_mask = 0;
- dynamic_printk_enabled = enable_mask;
- dynamic_printk_enabled2 = enable_mask;
-}
-
-static int disabled_hash(int i, bool first_table)
-{
- struct debug_name *e;
- struct hlist_node *node;
-
- if (first_table) {
- hlist_for_each_entry(e, node, &module_table[i], hlist) {
- if (e->enable)
- return 0;
- }
- } else {
- hlist_for_each_entry(e, node, &module_table2[i], hlist2) {
- if (e->enable)
- return 0;
- }
- }
- return 1;
-}
-
-static ssize_t pr_debug_write(struct file *file, const char __user *buf,
- size_t length, loff_t *ppos)
-{
- char *buffer, *s, *value_str, *setting_str;
- int err, value;
- struct debug_name *elem = NULL;
- int all = 0;
-
- if (length > PAGE_SIZE || length < 0)
- return -EINVAL;
-
- buffer = (char *)__get_free_page(GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
-
- err = -EFAULT;
- if (copy_from_user(buffer, buf, length))
- goto out;
-
- err = -EINVAL;
- if (length < PAGE_SIZE)
- buffer[length] = '\0';
- else if (buffer[PAGE_SIZE-1])
- goto out;
-
- err = -EINVAL;
- down(&debug_list_mutex);
-
- if (strncmp("set", buffer, 3))
- goto out_up;
- s = buffer + 3;
- setting_str = strsep(&s, "=");
- if (s == NULL)
- goto out_up;
- setting_str = strstrip(setting_str);
- value_str = strsep(&s, " ");
- if (s == NULL)
- goto out_up;
- s = strstrip(s);
- if (!strncmp(s, "all", 3))
- all = 1;
- else
- elem = find_debug_module(s);
- if (!strncmp(setting_str, "enable", 6)) {
- value = !!simple_strtol(value_str, NULL, 10);
- if (all) {
- if (value) {
- set_all(true);
- num_enabled = nr_entries;
- dynamic_enabled = DYNAMIC_ENABLED_ALL;
- } else {
- set_all(false);
- num_enabled = 0;
- dynamic_enabled = DYNAMIC_ENABLED_NONE;
- }
- err = 0;
- } else if (elem) {
- if (value && (elem->enable == 0)) {
- dynamic_printk_enabled |= (1LL << elem->hash1);
- dynamic_printk_enabled2 |= (1LL << elem->hash2);
- elem->enable = 1;
- num_enabled++;
- dynamic_enabled = DYNAMIC_ENABLED_SOME;
- err = 0;
- printk(KERN_DEBUG
- "debugging enabled for module %s\n",
- elem->name);
- } else if (!value && (elem->enable == 1)) {
- elem->enable = 0;
- num_enabled--;
- if (disabled_hash(elem->hash1, true))
- dynamic_printk_enabled &=
- ~(1LL << elem->hash1);
- if (disabled_hash(elem->hash2, false))
- dynamic_printk_enabled2 &=
- ~(1LL << elem->hash2);
- if (num_enabled)
- dynamic_enabled = DYNAMIC_ENABLED_SOME;
- else
- dynamic_enabled = DYNAMIC_ENABLED_NONE;
- err = 0;
- printk(KERN_DEBUG
- "debugging disabled for module %s\n",
- elem->name);
- }
- }
- }
- if (!err)
- err = length;
-out_up:
- up(&debug_list_mutex);
-out:
- free_page((unsigned long)buffer);
- return err;
-}
-
-static void *pr_debug_seq_start(struct seq_file *f, loff_t *pos)
-{
- return (*pos < DEBUG_HASH_TABLE_SIZE) ? pos : NULL;
-}
-
-static void *pr_debug_seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- (*pos)++;
- if (*pos >= DEBUG_HASH_TABLE_SIZE)
- return NULL;
- return pos;
-}
-
-static void pr_debug_seq_stop(struct seq_file *s, void *v)
-{
- /* Nothing to do */
-}
-
-static int pr_debug_seq_show(struct seq_file *s, void *v)
-{
- struct hlist_head *head;
- struct hlist_node *node;
- struct debug_name *elem;
- unsigned int i = *(loff_t *) v;
-
- rcu_read_lock();
- head = &module_table[i];
- hlist_for_each_entry_rcu(elem, node, head, hlist) {
- seq_printf(s, "%s enabled=%d", elem->name, elem->enable);
- seq_printf(s, "\n");
- }
- rcu_read_unlock();
- return 0;
-}
-
-static struct seq_operations pr_debug_seq_ops = {
- .start = pr_debug_seq_start,
- .next = pr_debug_seq_next,
- .stop = pr_debug_seq_stop,
- .show = pr_debug_seq_show
-};
-
-static int pr_debug_open(struct inode *inode, struct file *filp)
-{
- return seq_open(filp, &pr_debug_seq_ops);
-}
-
-static const struct file_operations pr_debug_operations = {
- .open = pr_debug_open,
- .read = seq_read,
- .write = pr_debug_write,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-static int __init dynamic_printk_init(void)
-{
- struct dentry *dir, *file;
- struct mod_debug *iter;
- unsigned long value;
-
- dir = debugfs_create_dir("dynamic_printk", NULL);
- if (!dir)
- return -ENOMEM;
- file = debugfs_create_file("modules", 0644, dir, NULL,
- &pr_debug_operations);
- if (!file) {
- debugfs_remove(dir);
- return -ENOMEM;
- }
- for (value = (unsigned long)__start___verbose;
- value < (unsigned long)__stop___verbose;
- value += sizeof(struct mod_debug)) {
- iter = (struct mod_debug *)value;
- register_dynamic_debug_module(iter->modname,
- iter->type,
- iter->logical_modname,
- iter->flag_names, iter->hash, iter->hash2);
- }
- if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
- set_all(true);
- return 0;
-}
-module_init(dynamic_printk_init);
-/* may want to move this earlier so we can get traces as early as possible */
-
-static int __init dynamic_printk_setup(char *str)
-{
- if (str)
- return -ENOENT;
- dynamic_enabled = DYNAMIC_ENABLED_ALL;
- return 0;
-}
-/* Use early_param(), so we can get debug output as early as possible */
-early_param("dynamic_printk", dynamic_printk_setup);
struct nf_conntrack_expect *exp) __read_mostly;
EXPORT_SYMBOL_GPL(nf_nat_pptp_hook_expectfn);
-#if defined(DEBUG) || defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
+#if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG)
/* PptpControlMessageType names */
const char *const pptp_msg_name[] = {
"UNKNOWN_MESSAGE",
-D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
#hash values
-ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
+ifdef CONFIG_DYNAMIC_DEBUG
debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\
-D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))"
else
projects / linux-2.6-omap-h63xx.git / commitdiff