litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Linus Torvalds <torvalds@linux-foundation.org>	2010-10-18 16:10:08 -0400
committer	Linus Torvalds <torvalds@linux-foundation.org>	2010-10-18 16:10:08 -0400
commit	b0579fc089808b68c53a6a95d043db034468116c (patch)
tree	f04f256392cec7325664ab6aeaef202c003cc31d /include/linux/kdev_t.h
parent	7f81c56cf29c0af66a1d0cdbce48441cdaf9fa16 (diff)
parent	f9ce6eb5b6fa8cbcf0a0fb7c5f4203f94730fc52 (diff)

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: evdev - fix EVIOCSABS regression Input: evdev - fix Ooops in EVIOCGABS/EVIOCSABS

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/*
 * kernel/lockdep_proc.c
 *
 * Runtime locking correctness validator
 *
 * Started by Ingo Molnar:
 *
 *  Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
 *
 * Code for /proc/lockdep and /proc/lockdep_stats:
 *
 */
#include <linux/export.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
#include <linux/debug_locks.h>
#include <linux/vmalloc.h>
#include <linux/sort.h>
#include <asm/uaccess.h>
#include <asm/div64.h>

#include "lockdep_internals.h"

static void *l_next(struct seq_file *m, void *v, loff_t *pos)
{
	return seq_list_next(v, &all_lock_classes, pos);
}

static void *l_start(struct seq_file *m, loff_t *pos)
{
	return seq_list_start_head(&all_lock_classes, *pos);
}

static void l_stop(struct seq_file *m, void *v)
{
}

static void print_name(struct seq_file *m, struct lock_class *class)
{
	char str[KSYM_NAME_LEN];
	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)
{
	struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
	struct lock_list *entry;
	char usage[LOCK_USAGE_CHARS];

	if (v == &all_lock_classes) {
		seq_printf(m, "all lock classes:\n");
		return 0;
	}

	seq_printf(m, "%p", class->key);
#ifdef CONFIG_DEBUG_LOCKDEP
	seq_printf(m, " OPS:%8ld", class->ops);
#endif
#ifdef CONFIG_PROVE_LOCKING
	seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
	seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
#endif

	get_usage_chars(class, usage);
	seq_printf(m, " %s", usage);

	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->key);
			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)
{
	return seq_open(file, &lockdep_ops);
}

static const struct file_operations proc_lockdep_operations = {
	.open		= lockdep_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

#ifdef CONFIG_PROVE_LOCKING
static void *lc_start(struct seq_file *m, loff_t *pos)
{
	if (*pos == 0)
		return SEQ_START_TOKEN;

	if (*pos - 1 < nr_lock_chains)
		return lock_chains + (*pos - 1);

	return NULL;
}

static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return lc_start(m, pos);
}

static void lc_stop(struct seq_file *m, void *v)
{
}

static int lc_show(struct seq_file *m, void *v)
{
	struct lock_chain *chain = v;
	struct lock_class *class;
	int i;

	if (v == SEQ_START_TOKEN) {
		seq_printf(m, "all lock chains:\n");
		return 0;
	}

	seq_printf(m, "irq_context: %d\n", chain->irq_context);

	for (i = 0; i < chain->depth; i++) {
		class = lock_chain_get_class(chain, i);
		if (!class->key)
			continue;

		seq_printf(m, "[%p] ", class->key);
		print_name(m, class);
		seq_puts(m, "\n");
	}
	seq_puts(m, "\n");

	return 0;
}

static const struct seq_operations lockdep_chains_ops = {
	.start	= lc_start,
	.next	= lc_next,
	.stop	= lc_stop,
	.show	= lc_show,
};

static int lockdep_chains_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &lockdep_chains_ops);
}

static const struct file_operations proc_lockdep_chains_operations = {
	.open		= lockdep_chains_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif /* CONFIG_PROVE_LOCKING */

static void lockdep_stats_debug_show(struct seq_file *m)
{
#ifdef CONFIG_DEBUG_LOCKDEP
	unsigned long long 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:           %11llu\n",
		debug_atomic_read(chain_lookup_misses));
	seq_printf(m, " chain lookup hits:             %11llu\n",
		debug_atomic_read(chain_lookup_hits));
	seq_printf(m, " cyclic checks:                 %11llu\n",
		debug_atomic_read(nr_cyclic_checks));
	seq_printf(m, " find-mask forwards checks:     %11llu\n",
		debug_atomic_read(nr_find_usage_forwards_checks));
	seq_printf(m, " find-mask backwards checks:    %11llu\n",
		debug_atomic_read(nr_find_usage_backwards_checks));

	seq_printf(m, " hardirq on events:             %11llu\n", hi1);
	seq_printf(m, " hardirq off events:            %11llu\n", hi2);
	seq_printf(m, " redundant hardirq ons:         %11llu\n", hr1);
	seq_printf(m, " redundant hardirq offs:        %11llu\n", hr2);
	seq_printf(m, " softirq on events:             %11llu\n", si1);
	seq_printf(m, " softirq off events:            %11llu\n", si2);
	seq_printf(m, " redundant softirq ons:         %11llu\n", sr1);
	seq_printf(m, " redundant softirq offs:        %11llu\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;

	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_IRQ)
			nr_irq_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
			nr_softirq_safe++;
		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
			nr_softirq_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
			nr_hardirq_safe++;
		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
			nr_hardirq_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
			nr_irq_read_safe++;
		if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
			nr_irq_read_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
			nr_softirq_read_safe++;
		if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
			nr_softirq_read_unsafe++;
		if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
			nr_hardirq_read_safe++;
		if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
			nr_hardirq_read_unsafe++;

#ifdef CONFIG_PROVE_LOCKING
		sum_forward_deps += lockdep_count_forward_deps(class);
#endif
	}
#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);

#ifdef CONFIG_PROVE_LOCKING
	seq_printf(m, " dependency chains:             %11lu [max: %lu]\n",
			nr_lock_chains, MAX_LOCKDEP_CHAINS);
	seq_printf(m, " dependency chain hlocks:       %11d [max: %lu]\n",
			nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
#endif

#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);
#ifdef CONFIG_PROVE_LOCKING


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