/* * kernel/lockdep_proc.c * * Runtime locking correctness validator * * Started by Ingo Molnar: * *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> * * Code for /proc/lockdep and /proc/lockdep_stats: * */#include <linux/module.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/kallsyms.h>#include <linux/debug_locks.h> #include "lockdep_internals.h" static void *l_next(struct seq_file *m, void *v, loff_t *pos){	struct lock_class *class = v; 	(*pos)++; 	if (class->lock_entry.next != &all_lock_classes)		class = list_entry(class->lock_entry.next, struct lock_class,				  lock_entry);	else		class = NULL;	m->private = class; 	return class;} static void *l_start(struct seq_file *m, loff_t *pos){	struct lock_class *class = m->private; 	if (&class->lock_entry == all_lock_classes.next)		seq_printf(m, "all lock classes:\n"); 	return class;} static void l_stop(struct seq_file *m, void *v){} static unsigned long count_forward_deps(struct lock_class *class){	struct lock_list *entry;	unsigned long ret = 1; 	/*	 * Recurse this class's dependency list:	 */	list_for_each_entry(entry, &class->locks_after, entry)		ret += count_forward_deps(entry->class); 	return ret;} static unsigned long count_backward_deps(struct lock_class *class){	struct lock_list *entry;	unsigned long ret = 1; 	/*	 * Recurse this class's dependency list:	 */	list_for_each_entry(entry, &class->locks_before, entry)		ret += count_backward_deps(entry->class); 	return ret;} static void print_name(struct seq_file *m, struct lock_class *class){	char str[128];	const char *name = class->name; 	if (!name) {		name = __get_key_name(class->key, str);		seq_printf(m, "%s", name);	} else{		seq_printf(m, "%s", name);		if (class->name_version > 1)			seq_printf(m, "#%d", class->name_version);		if (class->subclass)			seq_printf(m, "/%d", class->subclass);	}} static int l_show(struct seq_file *m, void *v){	unsigned long nr_forward_deps, nr_backward_deps;	struct lock_class *class = m->private;	struct lock_list *entry;	char c1, c2, c3, c4; 	seq_printf(m, "%p", class->key);#ifdef CONFIG_DEBUG_LOCKDEP	seq_printf(m, " OPS:%8ld", class->ops);#endif	nr_forward_deps = count_forward_deps(class);	seq_printf(m, " FD:%5ld", nr_forward_deps); 	nr_backward_deps = count_backward_deps(class);	seq_printf(m, " BD:%5ld", nr_backward_deps); 	get_usage_chars(class, &c1, &c2, &c3, &c4);	seq_printf(m, " %c%c%c%c", c1, c2, c3, c4); 	seq_printf(m, ": ");	print_name(m, class);	seq_puts(m, "\n"); 	list_for_each_entry(entry, &class->locks_after, entry) {		if (entry->distance == 1) {			seq_printf(m, " -> [%p] ", entry->class);			print_name(m, entry->class);			seq_puts(m, "\n");		}	}	seq_puts(m, "\n"); 	return 0;} static const struct seq_operations lockdep_ops = {	.start	= l_start,	.next	= l_next,	.stop	= l_stop,	.show	= l_show,}; static int lockdep_open(struct inode *inode, struct file *file){	int res = seq_open(file, &lockdep_ops);	if (!res) {		struct seq_file *m = file->private_data; 		if (!list_empty(&all_lock_classes))			m->private = list_entry(all_lock_classes.next,					struct lock_class, lock_entry);		else			m->private = NULL;	}	return res;} static const struct file_operations proc_lockdep_operations = {	.open		= lockdep_open,	.read		= seq_read,	.llseek		= seq_lseek,	.release	= seq_release,}; static void lockdep_stats_debug_show(struct seq_file *m){#ifdef CONFIG_DEBUG_LOCKDEP	unsigned int hi1 = debug_atomic_read(&hardirqs_on_events),		     hi2 = debug_atomic_read(&hardirqs_off_events),		     hr1 = debug_atomic_read(&redundant_hardirqs_on),		     hr2 = debug_atomic_read(&redundant_hardirqs_off),		     si1 = debug_atomic_read(&softirqs_on_events),		     si2 = debug_atomic_read(&softirqs_off_events),		     sr1 = debug_atomic_read(&redundant_softirqs_on),		     sr2 = debug_atomic_read(&redundant_softirqs_off); 	seq_printf(m, " chain lookup misses:           %11u\n",		debug_atomic_read(&chain_lookup_misses));	seq_printf(m, " chain lookup hits:             %11u\n",		debug_atomic_read(&chain_lookup_hits));	seq_printf(m, " cyclic checks:                 %11u\n",		debug_atomic_read(&nr_cyclic_checks));	seq_printf(m, " cyclic-check recursions:       %11u\n",		debug_atomic_read(&nr_cyclic_check_recursions));	seq_printf(m, " find-mask forwards checks:     %11u\n",		debug_atomic_read(&nr_find_usage_forwards_checks));	seq_printf(m, " find-mask forwards recursions: %11u\n",		debug_atomic_read(&nr_find_usage_forwards_recursions));	seq_printf(m, " find-mask backwards checks:    %11u\n",		debug_atomic_read(&nr_find_usage_backwards_checks));	seq_printf(m, " find-mask backwards recursions:%11u\n",		debug_atomic_read(&nr_find_usage_backwards_recursions)); 	seq_printf(m, " hardirq on events:             %11u\n", hi1);	seq_printf(m, " hardirq off events:            %11u\n", hi2);	seq_printf(m, " redundant hardirq ons:         %11u\n", hr1);	seq_printf(m, " redundant hardirq offs:        %11u\n", hr2);	seq_printf(m, " softirq on events:             %11u\n", si1);	seq_printf(m, " softirq off events:            %11u\n", si2);	seq_printf(m, " redundant softirq ons:         %11u\n", sr1);	seq_printf(m, " redundant softirq offs:        %11u\n", sr2);#endif} static int lockdep_stats_show(struct seq_file *m, void *v){	struct lock_class *class;	unsigned long nr_unused = 0, nr_uncategorized = 0,		      nr_irq_safe = 0, nr_irq_unsafe = 0,		      nr_softirq_safe = 0, nr_softirq_unsafe = 0,		      nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,		      nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,		      nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,		      nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,		      sum_forward_deps = 0, factor = 0; 	list_for_each_entry(class, &all_lock_classes, lock_entry) { 		if (class->usage_mask == 0)			nr_unused++;		if (class->usage_mask == LOCKF_USED)			nr_uncategorized++;		if (class->usage_mask & LOCKF_USED_IN_IRQ)			nr_irq_safe++;		if (class->usage_mask & LOCKF_ENABLED_IRQS)			nr_irq_unsafe++;		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)			nr_softirq_safe++;		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS)			nr_softirq_unsafe++;		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)			nr_hardirq_safe++;		if (class->usage_mask & LOCKF_ENABLED_HARDIRQS)			nr_hardirq_unsafe++;		if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)			nr_irq_read_safe++;		if (class->usage_mask & LOCKF_ENABLED_IRQS_READ)			nr_irq_read_unsafe++;		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)			nr_softirq_read_safe++;		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ)			nr_softirq_read_unsafe++;		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)			nr_hardirq_read_safe++;		if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ)			nr_hardirq_read_unsafe++; 		sum_forward_deps += count_forward_deps(class);	}#ifdef CONFIG_DEBUG_LOCKDEP	DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused);#endif	seq_printf(m, " lock-classes:                  %11lu [max: %lu]\n",			nr_lock_classes, MAX_LOCKDEP_KEYS);	seq_printf(m, " direct dependencies:           %11lu [max: %lu]\n",			nr_list_entries, MAX_LOCKDEP_ENTRIES);	seq_printf(m, " indirect dependencies:         %11lu\n",			sum_forward_deps); 	/*	 * Total number of dependencies:	 *	 * All irq-safe locks may nest inside irq-unsafe locks,	 * plus all the other known dependencies:	 */	seq_printf(m, " all direct dependencies:       %11lu\n",			nr_irq_unsafe * nr_irq_safe +			nr_hardirq_unsafe * nr_hardirq_safe +			nr_list_entries); 	/*	 * Estimated factor between direct and indirect	 * dependencies:	 */	if (nr_list_entries)		factor = sum_forward_deps / nr_list_entries; 	seq_printf(m, " dependency chains:             %11lu [max: %lu]\n",			nr_lock_chains, MAX_LOCKDEP_CHAINS); #ifdef CONFIG_TRACE_IRQFLAGS	seq_printf(m, " in-hardirq chains:             %11u\n",			nr_hardirq_chains);	seq_printf(m, " in-softirq chains:             %11u\n",			nr_softirq_chains);#endif	seq_printf(m, " in-process chains:             %11u\n",			nr_process_chains);	seq_printf(m, " stack-trace entries:           %11lu [max: %lu]\n",			nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);	seq_printf(m, " combined max dependencies:     %11u\n",			(nr_hardirq_chains + 1) *			(nr_softirq_chains + 1) *			(nr_process_chains + 1)	);	seq_printf(m, " hardirq-safe locks:            %11lu\n",			nr_hardirq_safe);	seq_printf(m, " hardirq-unsafe locks:          %11lu\n",			nr_hardirq_unsafe);	seq_printf(m, " softirq-safe locks:            %11lu\n",			nr_softirq_safe);	seq_printf(m, " softirq-unsafe locks:          %11lu\n",			nr_softirq_unsafe);	seq_printf(m, " irq-safe locks:                %11lu\n",			nr_irq_safe);	seq_printf(m, " irq-unsafe locks:              %11lu\n",			nr_irq_unsafe); 	seq_printf(m, " hardirq-read-safe locks:       %11lu\n",			nr_hardirq_read_safe);	seq_printf(m, " hardirq-read-unsafe locks:     %11lu\n",			nr_hardirq_read_unsafe);	seq_printf(m, " softirq-read-safe locks:       %11lu\n",			nr_softirq_read_safe);	seq_printf(m, " softirq-read-unsafe locks:     %11lu\n",			nr_softirq_read_unsafe);	seq_printf(m, " irq-read-safe locks:           %11lu\n",			nr_irq_read_safe);	seq_printf(m, " irq-read-unsafe locks:         %11lu\n",			nr_irq_read_unsafe); 	seq_printf(m, " uncategorized locks:           %11lu\n",			nr_uncategorized);	seq_printf(m, " unused locks:                  %11lu\n",			nr_unused);	seq_printf(m, " max locking depth:             %11u\n",			max_lockdep_depth);	seq_printf(m, " max recursion depth:           %11u\n",			max_recursion_depth);	lockdep_stats_debug_show(m);	seq_printf(m, " debug_locks:                   %11u\n",			debug_locks); 	return 0;} static int lockdep_stats_open(struct inode *inode, struct file *file){	return single_open(file, lockdep_stats_show, NULL);} static const struct file_operations proc_lockdep_stats_operations = {	.open		= lockdep_stats_open,	.read		= seq_read,	.llseek		= seq_lseek,	.release	= seq_release,}; static int __init lockdep_proc_init(void){	struct proc_dir_entry *entry; 	entry = create_proc_entry("lockdep", S_IRUSR, NULL);	if (entry)		entry->proc_fops = &proc_lockdep_operations; 	entry = create_proc_entry("lockdep_stats", S_IRUSR, NULL);	if (entry)		entry->proc_fops = &proc_lockdep_stats_operations; 	return 0;} __initcall(lockdep_proc_init);