// SPDX-License-Identifier: GPL-2.0
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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) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
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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/export.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 <linux/vmalloc.h>
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#include <linux/sort.h>
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#include <linux/uaccess.h>
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#include <asm/div64.h>
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#include "lockdep_internals.h"
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/*
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* Since iteration of lock_classes is done without holding the lockdep lock,
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* it is not safe to iterate all_lock_classes list directly as the iteration
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* may branch off to free_lock_classes or the zapped list. Iteration is done
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* directly on the lock_classes array by checking the lock_classes_in_use
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* bitmap and max_lock_class_idx.
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*/
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#define iterate_lock_classes(idx, class) \
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for (idx = 0, class = lock_classes; idx <= max_lock_class_idx; \
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idx++, class++)
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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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++class;
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*pos = class - lock_classes;
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return (*pos > max_lock_class_idx) ? NULL : 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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unsigned long idx = *pos;
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if (idx > max_lock_class_idx)
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return NULL;
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return lock_classes + idx;
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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 void print_name(struct seq_file *m, struct lock_class *class)
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{
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char str[KSYM_NAME_LEN];
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const char *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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}
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static int l_show(struct seq_file *m, void *v)
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{
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struct lock_class *class = v;
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struct lock_list *entry;
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char usage[LOCK_USAGE_CHARS];
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int idx = class - lock_classes;
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if (v == lock_classes)
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seq_printf(m, "all lock classes:\n");
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if (!test_bit(idx, lock_classes_in_use))
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return 0;
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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", debug_class_ops_read(class));
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#endif
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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
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seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
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#endif
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get_usage_chars(class, usage);
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seq_printf(m, " %s", usage);
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seq_printf(m, ": ");
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print_name(m, class);
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seq_puts(m, "\n");
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list_for_each_entry(entry, &class->locks_after, entry) {
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if (entry->distance == 1) {
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seq_printf(m, " -> [%p] ", entry->class->key);
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print_name(m, entry->class);
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seq_puts(m, "\n");
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}
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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 const 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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#ifdef CONFIG_PROVE_LOCKING
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static void *lc_start(struct seq_file *m, loff_t *pos)
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{
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if (*pos < 0)
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return NULL;
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if (*pos == 0)
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return SEQ_START_TOKEN;
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return lock_chains + (*pos - 1);
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}
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static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
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{
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*pos = lockdep_next_lockchain(*pos - 1) + 1;
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return lc_start(m, pos);
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}
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static void lc_stop(struct seq_file *m, void *v)
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{
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}
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static int lc_show(struct seq_file *m, void *v)
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{
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struct lock_chain *chain = v;
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struct lock_class *class;
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int i;
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static const char * const irq_strs[] = {
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[0] = "0",
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[LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq",
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[LOCK_CHAIN_SOFTIRQ_CONTEXT] = "softirq",
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[LOCK_CHAIN_SOFTIRQ_CONTEXT|
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LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq|softirq",
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};
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if (v == SEQ_START_TOKEN) {
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if (!nr_free_chain_hlocks)
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seq_printf(m, "(buggered) ");
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seq_printf(m, "all lock chains:\n");
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return 0;
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}
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seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]);
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for (i = 0; i < chain->depth; i++) {
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class = lock_chain_get_class(chain, i);
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if (!class->key)
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continue;
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seq_printf(m, "[%p] ", class->key);
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print_name(m, class);
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seq_puts(m, "\n");
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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 const struct seq_operations lockdep_chains_ops = {
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.start = lc_start,
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.next = lc_next,
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.stop = lc_stop,
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.show = lc_show,
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};
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#endif /* CONFIG_PROVE_LOCKING */
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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 long long 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: %11llu\n",
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debug_atomic_read(chain_lookup_misses));
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seq_printf(m, " chain lookup hits: %11llu\n",
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debug_atomic_read(chain_lookup_hits));
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seq_printf(m, " cyclic checks: %11llu\n",
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debug_atomic_read(nr_cyclic_checks));
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seq_printf(m, " redundant checks: %11llu\n",
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debug_atomic_read(nr_redundant_checks));
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seq_printf(m, " redundant links: %11llu\n",
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debug_atomic_read(nr_redundant));
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seq_printf(m, " find-mask forwards checks: %11llu\n",
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debug_atomic_read(nr_find_usage_forwards_checks));
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seq_printf(m, " find-mask backwards checks: %11llu\n",
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debug_atomic_read(nr_find_usage_backwards_checks));
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seq_printf(m, " hardirq on events: %11llu\n", hi1);
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seq_printf(m, " hardirq off events: %11llu\n", hi2);
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seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
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seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
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seq_printf(m, " softirq on events: %11llu\n", si1);
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seq_printf(m, " softirq off events: %11llu\n", si2);
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seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
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seq_printf(m, " redundant softirq offs: %11llu\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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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;
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#ifdef CONFIG_PROVE_LOCKING
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struct lock_class *class;
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unsigned long idx;
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iterate_lock_classes(idx, class) {
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if (!test_bit(idx, lock_classes_in_use))
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continue;
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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_IRQ)
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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_SOFTIRQ)
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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_HARDIRQ)
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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_IRQ_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_SOFTIRQ_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_HARDIRQ_READ)
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nr_hardirq_read_unsafe++;
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sum_forward_deps += lockdep_count_forward_deps(class);
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}
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#ifdef CONFIG_DEBUG_LOCKDEP
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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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#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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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
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lock_chain_count(), MAX_LOCKDEP_CHAINS);
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seq_printf(m, " dependency chain hlocks used: %11lu [max: %lu]\n",
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MAX_LOCKDEP_CHAIN_HLOCKS -
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(nr_free_chain_hlocks + nr_lost_chain_hlocks),
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MAX_LOCKDEP_CHAIN_HLOCKS);
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seq_printf(m, " dependency chain hlocks lost: %11u\n",
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nr_lost_chain_hlocks);
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#endif
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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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#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING)
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seq_printf(m, " number of stack traces: %11llu\n",
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lockdep_stack_trace_count());
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seq_printf(m, " number of stack hash chains: %11llu\n",
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lockdep_stack_hash_count());
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#endif
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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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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " max bfs queue depth: %11u\n",
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max_bfs_queue_depth);
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#endif
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seq_printf(m, " max lock class index: %11lu\n",
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max_lock_class_idx);
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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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/*
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* Zappped classes and lockdep data buffers reuse statistics.
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*/
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seq_puts(m, "\n");
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seq_printf(m, " zapped classes: %11lu\n",
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nr_zapped_classes);
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#ifdef CONFIG_PROVE_LOCKING
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seq_printf(m, " zapped lock chains: %11lu\n",
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nr_zapped_lock_chains);
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seq_printf(m, " large chain blocks: %11u\n",
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nr_large_chain_blocks);
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#endif
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return 0;
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}
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#ifdef CONFIG_LOCK_STAT
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struct lock_stat_data {
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struct lock_class *class;
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struct lock_class_stats stats;
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};
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struct lock_stat_seq {
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struct lock_stat_data *iter_end;
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struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
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};
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/*
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* sort on absolute number of contentions
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*/
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static int lock_stat_cmp(const void *l, const void *r)
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{
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const struct lock_stat_data *dl = l, *dr = r;
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unsigned long nl, nr;
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nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
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nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
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return nr - nl;
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}
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static void seq_line(struct seq_file *m, char c, int offset, int length)
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{
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int i;
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for (i = 0; i < offset; i++)
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seq_puts(m, " ");
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for (i = 0; i < length; i++)
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seq_printf(m, "%c", c);
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seq_puts(m, "\n");
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}
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static void snprint_time(char *buf, size_t bufsiz, s64 nr)
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{
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s64 div;
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s32 rem;
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nr += 5; /* for display rounding */
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div = div_s64_rem(nr, 1000, &rem);
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snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
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}
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static void seq_time(struct seq_file *m, s64 time)
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{
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char num[15];
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snprint_time(num, sizeof(num), time);
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seq_printf(m, " %14s", num);
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}
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static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
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{
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seq_printf(m, "%14lu", lt->nr);
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seq_time(m, lt->min);
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seq_time(m, lt->max);
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seq_time(m, lt->total);
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seq_time(m, lt->nr ? div64_u64(lt->total, lt->nr) : 0);
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}
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static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
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{
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const struct lockdep_subclass_key *ckey;
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struct lock_class_stats *stats;
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struct lock_class *class;
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const char *cname;
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int i, namelen;
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char name[39];
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class = data->class;
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stats = &data->stats;
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namelen = 38;
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if (class->name_version > 1)
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namelen -= 2; /* XXX truncates versions > 9 */
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if (class->subclass)
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namelen -= 2;
|
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rcu_read_lock_sched();
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cname = rcu_dereference_sched(class->name);
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ckey = rcu_dereference_sched(class->key);
|
|
if (!cname && !ckey) {
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rcu_read_unlock_sched();
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return;
|
|
} else if (!cname) {
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char str[KSYM_NAME_LEN];
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const char *key_name;
|
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key_name = __get_key_name(ckey, str);
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snprintf(name, namelen, "%s", key_name);
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} else {
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snprintf(name, namelen, "%s", cname);
|
}
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rcu_read_unlock_sched();
|
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namelen = strlen(name);
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if (class->name_version > 1) {
|
snprintf(name+namelen, 3, "#%d", class->name_version);
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namelen += 2;
|
}
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if (class->subclass) {
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snprintf(name+namelen, 3, "/%d", class->subclass);
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namelen += 2;
|
}
|
|
if (stats->write_holdtime.nr) {
|
if (stats->read_holdtime.nr)
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seq_printf(m, "%38s-W:", name);
|
else
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seq_printf(m, "%40s:", name);
|
|
seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
|
seq_lock_time(m, &stats->write_waittime);
|
seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
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seq_lock_time(m, &stats->write_holdtime);
|
seq_puts(m, "\n");
|
}
|
|
if (stats->read_holdtime.nr) {
|
seq_printf(m, "%38s-R:", name);
|
seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
|
seq_lock_time(m, &stats->read_waittime);
|
seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
|
seq_lock_time(m, &stats->read_holdtime);
|
seq_puts(m, "\n");
|
}
|
|
if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
|
return;
|
|
if (stats->read_holdtime.nr)
|
namelen += 2;
|
|
for (i = 0; i < LOCKSTAT_POINTS; i++) {
|
char ip[32];
|
|
if (class->contention_point[i] == 0)
|
break;
|
|
if (!i)
|
seq_line(m, '-', 40-namelen, namelen);
|
|
snprintf(ip, sizeof(ip), "[<%p>]",
|
(void *)class->contention_point[i]);
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seq_printf(m, "%40s %14lu %29s %pS\n",
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name, stats->contention_point[i],
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ip, (void *)class->contention_point[i]);
|
}
|
for (i = 0; i < LOCKSTAT_POINTS; i++) {
|
char ip[32];
|
|
if (class->contending_point[i] == 0)
|
break;
|
|
if (!i)
|
seq_line(m, '-', 40-namelen, namelen);
|
|
snprintf(ip, sizeof(ip), "[<%p>]",
|
(void *)class->contending_point[i]);
|
seq_printf(m, "%40s %14lu %29s %pS\n",
|
name, stats->contending_point[i],
|
ip, (void *)class->contending_point[i]);
|
}
|
if (i) {
|
seq_puts(m, "\n");
|
seq_line(m, '.', 0, 40 + 1 + 12 * (14 + 1));
|
seq_puts(m, "\n");
|
}
|
}
|
|
static void seq_header(struct seq_file *m)
|
{
|
seq_puts(m, "lock_stat version 0.4\n");
|
|
if (unlikely(!debug_locks))
|
seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
|
|
seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
|
seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s %14s %14s "
|
"%14s %14s\n",
|
"class name",
|
"con-bounces",
|
"contentions",
|
"waittime-min",
|
"waittime-max",
|
"waittime-total",
|
"waittime-avg",
|
"acq-bounces",
|
"acquisitions",
|
"holdtime-min",
|
"holdtime-max",
|
"holdtime-total",
|
"holdtime-avg");
|
seq_line(m, '-', 0, 40 + 1 + 12 * (14 + 1));
|
seq_printf(m, "\n");
|
}
|
|
static void *ls_start(struct seq_file *m, loff_t *pos)
|
{
|
struct lock_stat_seq *data = m->private;
|
struct lock_stat_data *iter;
|
|
if (*pos == 0)
|
return SEQ_START_TOKEN;
|
|
iter = data->stats + (*pos - 1);
|
if (iter >= data->iter_end)
|
iter = NULL;
|
|
return iter;
|
}
|
|
static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
|
{
|
(*pos)++;
|
return ls_start(m, pos);
|
}
|
|
static void ls_stop(struct seq_file *m, void *v)
|
{
|
}
|
|
static int ls_show(struct seq_file *m, void *v)
|
{
|
if (v == SEQ_START_TOKEN)
|
seq_header(m);
|
else
|
seq_stats(m, v);
|
|
return 0;
|
}
|
|
static const struct seq_operations lockstat_ops = {
|
.start = ls_start,
|
.next = ls_next,
|
.stop = ls_stop,
|
.show = ls_show,
|
};
|
|
static int lock_stat_open(struct inode *inode, struct file *file)
|
{
|
int res;
|
struct lock_class *class;
|
struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
|
|
if (!data)
|
return -ENOMEM;
|
|
res = seq_open(file, &lockstat_ops);
|
if (!res) {
|
struct lock_stat_data *iter = data->stats;
|
struct seq_file *m = file->private_data;
|
unsigned long idx;
|
|
iterate_lock_classes(idx, class) {
|
if (!test_bit(idx, lock_classes_in_use))
|
continue;
|
iter->class = class;
|
iter->stats = lock_stats(class);
|
iter++;
|
}
|
|
data->iter_end = iter;
|
|
sort(data->stats, data->iter_end - data->stats,
|
sizeof(struct lock_stat_data),
|
lock_stat_cmp, NULL);
|
|
m->private = data;
|
} else
|
vfree(data);
|
|
return res;
|
}
|
|
static ssize_t lock_stat_write(struct file *file, const char __user *buf,
|
size_t count, loff_t *ppos)
|
{
|
struct lock_class *class;
|
unsigned long idx;
|
char c;
|
|
if (count) {
|
if (get_user(c, buf))
|
return -EFAULT;
|
|
if (c != '0')
|
return count;
|
|
iterate_lock_classes(idx, class) {
|
if (!test_bit(idx, lock_classes_in_use))
|
continue;
|
clear_lock_stats(class);
|
}
|
}
|
return count;
|
}
|
|
static int lock_stat_release(struct inode *inode, struct file *file)
|
{
|
struct seq_file *seq = file->private_data;
|
|
vfree(seq->private);
|
return seq_release(inode, file);
|
}
|
|
static const struct proc_ops lock_stat_proc_ops = {
|
.proc_open = lock_stat_open,
|
.proc_write = lock_stat_write,
|
.proc_read = seq_read,
|
.proc_lseek = seq_lseek,
|
.proc_release = lock_stat_release,
|
};
|
#endif /* CONFIG_LOCK_STAT */
|
|
static int __init lockdep_proc_init(void)
|
{
|
proc_create_seq("lockdep", S_IRUSR, NULL, &lockdep_ops);
|
#ifdef CONFIG_PROVE_LOCKING
|
proc_create_seq("lockdep_chains", S_IRUSR, NULL, &lockdep_chains_ops);
|
#endif
|
proc_create_single("lockdep_stats", S_IRUSR, NULL, lockdep_stats_show);
|
#ifdef CONFIG_LOCK_STAT
|
proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL, &lock_stat_proc_ops);
|
#endif
|
|
return 0;
|
}
|
|
__initcall(lockdep_proc_init);
|
