mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 00:56:39 +07:00
068135e635
Generate locking graph information into /proc/lockdep, for lock hierarchy documentation and visualization purposes. sample output: c089fd5c OPS: 138 FD: 14 BD: 1 --..: &tty->termios_mutex -> [c07a3430] tty_ldisc_lock -> [c07a37f0] &port_lock_key -> [c07afdc0] &rq->rq_lock_key#2 The lock classes listed are all the first-hop lock dependencies that lockdep has seen so far. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
363 lines
10 KiB
C
363 lines
10 KiB
C
/*
|
|
* 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/sched.h>
|
|
#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_LOCKDEP_DEBUG
|
|
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);
|
|
|