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-rw-r--r--lib/dynamic_printk.c414
1 files changed, 0 insertions, 414 deletions
diff --git a/lib/dynamic_printk.c b/lib/dynamic_printk.c
deleted file mode 100644
index 165a19763dc9..000000000000
--- a/lib/dynamic_printk.c
+++ /dev/null
@@ -1,414 +0,0 @@
-/*
- * 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);
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-10-06 02:30:30 +0000