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