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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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SPDX-License-Identifier: GPL-2.0/* * lib/locking-selftest.c * * Testsuite for various locking APIs: spinlocks, rwlocks, * mutexes and rw-semaphores. * * It is checking both false positives and false negatives. * * Started by Ingo Molnar: * * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> */#include <linux/rwsem.h>#include <linux/mutex.h>#include <linux/ww_mutex.h>#include <linux/sched.h>#include <linux/sched/mm.h>#include <linux/delay.h>#include <linux/lockdep.h>#include <linux/spinlock.h>#include <linux/kallsyms.h>#include <linux/interrupt.h>#include <linux/debug_locks.h>#include <linux/irqflags.h>#include <linux/rtmutex.h>#include <linux/local_lock.h>
#ifdef CONFIG_PREEMPT_RT# define NON_RT(...)#else# define NON_RT(...) __VA_ARGS__#endif
/* * Change this to 1 if you want to see the failure printouts: */static unsigned int debug_locks_verbose;unsigned int force_read_lock_recursive;
static DEFINE_WD_CLASS(ww_lockdep);
static int __init setup_debug_locks_verbose(char *str){ get_option(&str, &debug_locks_verbose);
return 1;}
__setup("debug_locks_verbose=", setup_debug_locks_verbose);
#define FAILURE 0#define SUCCESS 1
#define LOCKTYPE_SPIN 0x1#define LOCKTYPE_RWLOCK 0x2#define LOCKTYPE_MUTEX 0x4#define LOCKTYPE_RWSEM 0x8#define LOCKTYPE_WW 0x10#define LOCKTYPE_RTMUTEX 0x20#define LOCKTYPE_LL 0x40#define LOCKTYPE_SPECIAL 0x80
static struct ww_acquire_ctx t, t2;static struct ww_mutex o, o2, o3;
/* * Normal standalone locks, for the circular and irq-context * dependency tests: */static DEFINE_SPINLOCK(lock_A);static DEFINE_SPINLOCK(lock_B);static DEFINE_SPINLOCK(lock_C);static DEFINE_SPINLOCK(lock_D);
static DEFINE_RAW_SPINLOCK(raw_lock_A);static DEFINE_RAW_SPINLOCK(raw_lock_B);
static DEFINE_RWLOCK(rwlock_A);static DEFINE_RWLOCK(rwlock_B);static DEFINE_RWLOCK(rwlock_C);static DEFINE_RWLOCK(rwlock_D);
static DEFINE_MUTEX(mutex_A);static DEFINE_MUTEX(mutex_B);static DEFINE_MUTEX(mutex_C);static DEFINE_MUTEX(mutex_D);
static DECLARE_RWSEM(rwsem_A);static DECLARE_RWSEM(rwsem_B);static DECLARE_RWSEM(rwsem_C);static DECLARE_RWSEM(rwsem_D);
#ifdef CONFIG_RT_MUTEXES
static DEFINE_RT_MUTEX(rtmutex_A);static DEFINE_RT_MUTEX(rtmutex_B);static DEFINE_RT_MUTEX(rtmutex_C);static DEFINE_RT_MUTEX(rtmutex_D);
#endif
/* * Locks that we initialize dynamically as well so that * e.g. X1 and X2 becomes two instances of the same class, * but X* and Y* are different classes. We do this so that * we do not trigger a real lockup: */static DEFINE_SPINLOCK(lock_X1);static DEFINE_SPINLOCK(lock_X2);static DEFINE_SPINLOCK(lock_Y1);static DEFINE_SPINLOCK(lock_Y2);static DEFINE_SPINLOCK(lock_Z1);static DEFINE_SPINLOCK(lock_Z2);
static DEFINE_RWLOCK(rwlock_X1);static DEFINE_RWLOCK(rwlock_X2);static DEFINE_RWLOCK(rwlock_Y1);static DEFINE_RWLOCK(rwlock_Y2);static DEFINE_RWLOCK(rwlock_Z1);static DEFINE_RWLOCK(rwlock_Z2);
static DEFINE_MUTEX(mutex_X1);static DEFINE_MUTEX(mutex_X2);static DEFINE_MUTEX(mutex_Y1);static DEFINE_MUTEX(mutex_Y2);static DEFINE_MUTEX(mutex_Z1);static DEFINE_MUTEX(mutex_Z2);
static DECLARE_RWSEM(rwsem_X1);static DECLARE_RWSEM(rwsem_X2);static DECLARE_RWSEM(rwsem_Y1);static DECLARE_RWSEM(rwsem_Y2);static DECLARE_RWSEM(rwsem_Z1);static DECLARE_RWSEM(rwsem_Z2);
#ifdef CONFIG_RT_MUTEXES
static DEFINE_RT_MUTEX(rtmutex_X1);static DEFINE_RT_MUTEX(rtmutex_X2);static DEFINE_RT_MUTEX(rtmutex_Y1);static DEFINE_RT_MUTEX(rtmutex_Y2);static DEFINE_RT_MUTEX(rtmutex_Z1);static DEFINE_RT_MUTEX(rtmutex_Z2);
#endif
static DEFINE_PER_CPU(local_lock_t, local_A);
/* * non-inlined runtime initializers, to let separate locks share * the same lock-class: */#define INIT_CLASS_FUNC(class) \static noinline void \init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \ struct mutex *mutex, struct rw_semaphore *rwsem)\{ \ spin_lock_init(lock); \ rwlock_init(rwlock); \ mutex_init(mutex); \ init_rwsem(rwsem); \}
INIT_CLASS_FUNC(X)INIT_CLASS_FUNC(Y)INIT_CLASS_FUNC(Z)
static void init_shared_classes(void){#ifdef CONFIG_RT_MUTEXES static struct lock_class_key rt_X, rt_Y, rt_Z;
__rt_mutex_init(&rtmutex_X1, __func__, &rt_X); __rt_mutex_init(&rtmutex_X2, __func__, &rt_X); __rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y); __rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y); __rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z); __rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);#endif
init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);}
/* * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. * The following functions use a lock from a simulated hardirq/softirq * context, causing the locks to be marked as hardirq-safe/softirq-safe: */
#define HARDIRQ_DISABLE local_irq_disable#define HARDIRQ_ENABLE local_irq_enable
#define HARDIRQ_ENTER() \ local_irq_disable(); \ __irq_enter(); \ lockdep_hardirq_threaded(); \ WARN_ON(!in_hardirq());
#define HARDIRQ_EXIT() \ __irq_exit(); \ local_irq_enable();
#define SOFTIRQ_DISABLE local_bh_disable#define SOFTIRQ_ENABLE local_bh_enable
#define SOFTIRQ_ENTER() \ local_bh_disable(); \ local_irq_disable(); \ lockdep_softirq_enter(); \ WARN_ON(!in_softirq());
#define SOFTIRQ_EXIT() \ lockdep_softirq_exit(); \ local_irq_enable(); \ local_bh_enable();
/* * Shortcuts for lock/unlock API variants, to keep * the testcases compact: */#define L(x) spin_lock(&lock_##x)#define U(x) spin_unlock(&lock_##x)#define LU(x) L(x); U(x)#define SI(x) spin_lock_init(&lock_##x)
#define WL(x) write_lock(&rwlock_##x)#define WU(x) write_unlock(&rwlock_##x)#define WLU(x) WL(x); WU(x)
#define RL(x) read_lock(&rwlock_##x)#define RU(x) read_unlock(&rwlock_##x)#define RLU(x) RL(x); RU(x)#define RWI(x) rwlock_init(&rwlock_##x)
#define ML(x) mutex_lock(&mutex_##x)#define MU(x) mutex_unlock(&mutex_##x)#define MI(x) mutex_init(&mutex_##x)
#define RTL(x) rt_mutex_lock(&rtmutex_##x)#define RTU(x) rt_mutex_unlock(&rtmutex_##x)#define RTI(x) rt_mutex_init(&rtmutex_##x)
#define WSL(x) down_write(&rwsem_##x)#define WSU(x) up_write(&rwsem_##x)
#define RSL(x) down_read(&rwsem_##x)#define RSU(x) up_read(&rwsem_##x)#define RWSI(x) init_rwsem(&rwsem_##x)
#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH#define WWAI(x) ww_acquire_init(x, &ww_lockdep)#else#define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)#endif#define WWAD(x) ww_acquire_done(x)#define WWAF(x) ww_acquire_fini(x)
#define WWL(x, c) ww_mutex_lock(x, c)#define WWT(x) ww_mutex_trylock(x, NULL)#define WWL1(x) ww_mutex_lock(x, NULL)#define WWU(x) ww_mutex_unlock(x)
#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
/* * Generate different permutations of the same testcase, using * the same basic lock-dependency/state events: */
#define GENERATE_TESTCASE(name) \ \static void name(void) { E(); }
#define GENERATE_PERMUTATIONS_2_EVENTS(name) \ \static void name##_12(void) { E1(); E2(); } \static void name##_21(void) { E2(); E1(); }
#define GENERATE_PERMUTATIONS_3_EVENTS(name) \ \static void name##_123(void) { E1(); E2(); E3(); } \static void name##_132(void) { E1(); E3(); E2(); } \static void name##_213(void) { E2(); E1(); E3(); } \static void name##_231(void) { E2(); E3(); E1(); } \static void name##_312(void) { E3(); E1(); E2(); } \static void name##_321(void) { E3(); E2(); E1(); }
/* * AA deadlock: */
#define E() \ \ LOCK(X1); \ LOCK(X2); /* this one should fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(AA_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(AA_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(AA_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(AA_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(AA_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(AA_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(AA_rtmutex);#endif
#undef E
/* * Special-case for read-locking, they are * allowed to recurse on the same lock class: */static void rlock_AA1(void){ RL(X1); RL(X1); // this one should NOT fail}
static void rlock_AA1B(void){ RL(X1); RL(X2); // this one should NOT fail}
static void rsem_AA1(void){ RSL(X1); RSL(X1); // this one should fail}
static void rsem_AA1B(void){ RSL(X1); RSL(X2); // this one should fail}/* * The mixing of read and write locks is not allowed: */static void rlock_AA2(void){ RL(X1); WL(X2); // this one should fail}
static void rsem_AA2(void){ RSL(X1); WSL(X2); // this one should fail}
static void rlock_AA3(void){ WL(X1); RL(X2); // this one should fail}
static void rsem_AA3(void){ WSL(X1); RSL(X2); // this one should fail}
/* * read_lock(A) * spin_lock(B) * spin_lock(B) * write_lock(A) */static void rlock_ABBA1(void){ RL(X1); L(Y1); U(Y1); RU(X1);
L(Y1); WL(X1); WU(X1); U(Y1); // should fail}
static void rwsem_ABBA1(void){ RSL(X1); ML(Y1); MU(Y1); RSU(X1);
ML(Y1); WSL(X1); WSU(X1); MU(Y1); // should fail}
/* * read_lock(A) * spin_lock(B) * spin_lock(B) * write_lock(A) * * This test case is aimed at poking whether the chain cache prevents us from * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ * read/write locks, the following case may happen * * { read_lock(A)->lock(B) dependency exists } * * P0: * lock(B); * read_lock(A); * * { Not a deadlock, B -> A is added in the chain cache } * * P1: * lock(B); * write_lock(A); * * { B->A found in chain cache, not reported as a deadlock } * */static void rlock_chaincache_ABBA1(void){ RL(X1); L(Y1); U(Y1); RU(X1);
L(Y1); RL(X1); RU(X1); U(Y1);
L(Y1); WL(X1); WU(X1); U(Y1); // should fail}
/* * read_lock(A) * spin_lock(B) * spin_lock(B) * read_lock(A) */static void rlock_ABBA2(void){ RL(X1); L(Y1); U(Y1); RU(X1);
L(Y1); RL(X1); RU(X1); U(Y1); // should NOT fail}
static void rwsem_ABBA2(void){ RSL(X1); ML(Y1); MU(Y1); RSU(X1);
ML(Y1); RSL(X1); RSU(X1); MU(Y1); // should fail}
/* * write_lock(A) * spin_lock(B) * spin_lock(B) * write_lock(A) */static void rlock_ABBA3(void){ WL(X1); L(Y1); U(Y1); WU(X1);
L(Y1); WL(X1); WU(X1); U(Y1); // should fail}
static void rwsem_ABBA3(void){ WSL(X1); ML(Y1); MU(Y1); WSU(X1);
ML(Y1); WSL(X1); WSU(X1); MU(Y1); // should fail}
/* * ABBA deadlock: */
#define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(B, A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(ABBA_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(ABBA_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(ABBA_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(ABBA_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(ABBA_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(ABBA_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(ABBA_rtmutex);#endif
#undef E
/* * AB BC CA deadlock: */
#define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(B, C); \ LOCK_UNLOCK_2(C, A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(ABBCCA_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(ABBCCA_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(ABBCCA_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(ABBCCA_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(ABBCCA_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(ABBCCA_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(ABBCCA_rtmutex);#endif
#undef E
/* * AB CA BC deadlock: */
#define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(C, A); \ LOCK_UNLOCK_2(B, C); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(ABCABC_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(ABCABC_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(ABCABC_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(ABCABC_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(ABCABC_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(ABCABC_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(ABCABC_rtmutex);#endif
#undef E
/* * AB BC CD DA deadlock: */
#define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(B, C); \ LOCK_UNLOCK_2(C, D); \ LOCK_UNLOCK_2(D, A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(ABBCCDDA_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(ABBCCDDA_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(ABBCCDDA_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(ABBCCDDA_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(ABBCCDDA_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(ABBCCDDA_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(ABBCCDDA_rtmutex);#endif
#undef E
/* * AB CD BD DA deadlock: */#define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(C, D); \ LOCK_UNLOCK_2(B, D); \ LOCK_UNLOCK_2(D, A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(ABCDBDDA_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(ABCDBDDA_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(ABCDBDDA_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(ABCDBDDA_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(ABCDBDDA_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(ABCDBDDA_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(ABCDBDDA_rtmutex);#endif
#undef E
/* * AB CD BC DA deadlock: */#define E() \ \ LOCK_UNLOCK_2(A, B); \ LOCK_UNLOCK_2(C, D); \ LOCK_UNLOCK_2(B, C); \ LOCK_UNLOCK_2(D, A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(ABCDBCDA_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(ABCDBCDA_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(ABCDBCDA_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(ABCDBCDA_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(ABCDBCDA_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(ABCDBCDA_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(ABCDBCDA_rtmutex);#endif
#undef E
#ifdef CONFIG_PREEMPT_RT# define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); }#else# define RT_PREPARE_DBL_UNLOCK()#endif/* * Double unlock: */#define E() \ \ LOCK(A); \ RT_PREPARE_DBL_UNLOCK(); \ UNLOCK(A); \ UNLOCK(A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(double_unlock_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(double_unlock_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(double_unlock_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(double_unlock_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(double_unlock_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(double_unlock_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(double_unlock_rtmutex);#endif
#undef E
/* * initializing a held lock: */#define E() \ \ LOCK(A); \ INIT(A); /* fail */
/* * 6 testcases: */#include "locking-selftest-spin.h"GENERATE_TESTCASE(init_held_spin)#include "locking-selftest-wlock.h"GENERATE_TESTCASE(init_held_wlock)#include "locking-selftest-rlock.h"GENERATE_TESTCASE(init_held_rlock)#include "locking-selftest-mutex.h"GENERATE_TESTCASE(init_held_mutex)#include "locking-selftest-wsem.h"GENERATE_TESTCASE(init_held_wsem)#include "locking-selftest-rsem.h"GENERATE_TESTCASE(init_held_rsem)
#ifdef CONFIG_RT_MUTEXES#include "locking-selftest-rtmutex.h"GENERATE_TESTCASE(init_held_rtmutex);#endif
#undef E
/* * locking an irq-safe lock with irqs enabled: */#define E1() \ \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT();
#define E2() \ \ LOCK(A); \ UNLOCK(A);
/* * Generate 24 testcases: */#include "locking-selftest-spin-hardirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
#include "locking-selftest-rlock-hardirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
#include "locking-selftest-wlock-hardirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-spin-softirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
#include "locking-selftest-rlock-softirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
#include "locking-selftest-wlock-softirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)#endif
#undef E1#undef E2
#ifndef CONFIG_PREEMPT_RT/* * Enabling hardirqs with a softirq-safe lock held: */#define E1() \ \ SOFTIRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ SOFTIRQ_EXIT();
#define E2() \ \ HARDIRQ_DISABLE(); \ LOCK(A); \ HARDIRQ_ENABLE(); \ UNLOCK(A);
/* * Generate 12 testcases: */#include "locking-selftest-spin.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
#undef E1#undef E2
#endif
/* * Enabling irqs with an irq-safe lock held: */#define E1() \ \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT();
#define E2() \ \ IRQ_DISABLE(); \ LOCK(A); \ IRQ_ENABLE(); \ UNLOCK(A);
/* * Generate 24 testcases: */#include "locking-selftest-spin-hardirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
#include "locking-selftest-rlock-hardirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
#include "locking-selftest-wlock-hardirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-spin-softirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
#include "locking-selftest-rlock-softirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
#include "locking-selftest-wlock-softirq.h"GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)#endif
#undef E1#undef E2
/* * Acquiring a irq-unsafe lock while holding an irq-safe-lock: */#define E1() \ \ LOCK(A); \ LOCK(B); \ UNLOCK(B); \ UNLOCK(A); \
#define E2() \ \ LOCK(B); \ UNLOCK(B);
#define E3() \ \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT();
/* * Generate 36 testcases: */#include "locking-selftest-spin-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
#include "locking-selftest-rlock-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
#include "locking-selftest-wlock-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-spin-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
#include "locking-selftest-rlock-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
#include "locking-selftest-wlock-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)#endif
#undef E1#undef E2#undef E3
/* * If a lock turns into softirq-safe, but earlier it took * a softirq-unsafe lock: */
#define E1() \ IRQ_DISABLE(); \ LOCK(A); \ LOCK(B); \ UNLOCK(B); \ UNLOCK(A); \ IRQ_ENABLE();
#define E2() \ LOCK(B); \ UNLOCK(B);
#define E3() \ IRQ_ENTER(); \ LOCK(A); \ UNLOCK(A); \ IRQ_EXIT();
/* * Generate 36 testcases: */#include "locking-selftest-spin-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
#include "locking-selftest-rlock-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
#include "locking-selftest-wlock-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-spin-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
#include "locking-selftest-rlock-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
#include "locking-selftest-wlock-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)#endif
#undef E1#undef E2#undef E3
/* * read-lock / write-lock irq inversion. * * Deadlock scenario: * * CPU#1 is at #1, i.e. it has write-locked A, but has not * taken B yet. * * CPU#2 is at #2, i.e. it has locked B. * * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. * * The deadlock occurs because CPU#1 will spin on B, and CPU#2 * will spin on A. */
#define E1() \ \ IRQ_DISABLE(); \ WL(A); \ LOCK(B); \ UNLOCK(B); \ WU(A); \ IRQ_ENABLE();
#define E2() \ \ LOCK(B); \ UNLOCK(B);
#define E3() \ \ IRQ_ENTER(); \ RL(A); \ RU(A); \ IRQ_EXIT();
/* * Generate 36 testcases: */#include "locking-selftest-spin-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
#include "locking-selftest-rlock-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
#include "locking-selftest-wlock-hardirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-spin-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
#include "locking-selftest-rlock-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
#include "locking-selftest-wlock-softirq.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)#endif
#undef E1#undef E2#undef E3
/* * write-read / write-read / write-read deadlock even if read is recursive */
#define E1() \ \ WL(X1); \ RL(Y1); \ RU(Y1); \ WU(X1);
#define E2() \ \ WL(Y1); \ RL(Z1); \ RU(Z1); \ WU(Y1);
#define E3() \ \ WL(Z1); \ RL(X1); \ RU(X1); \ WU(Z1);
#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
#undef E1#undef E2#undef E3
/* * write-write / read-read / write-read deadlock even if read is recursive */
#define E1() \ \ WL(X1); \ WL(Y1); \ WU(Y1); \ WU(X1);
#define E2() \ \ RL(Y1); \ RL(Z1); \ RU(Z1); \ RU(Y1);
#define E3() \ \ WL(Z1); \ RL(X1); \ RU(X1); \ WU(Z1);
#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
#undef E1#undef E2#undef E3
/* * write-write / read-read / read-write is not deadlock when read is recursive */
#define E1() \ \ WL(X1); \ WL(Y1); \ WU(Y1); \ WU(X1);
#define E2() \ \ RL(Y1); \ RL(Z1); \ RU(Z1); \ RU(Y1);
#define E3() \ \ RL(Z1); \ WL(X1); \ WU(X1); \ RU(Z1);
#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
#undef E1#undef E2#undef E3
/* * write-read / read-read / write-write is not deadlock when read is recursive */
#define E1() \ \ WL(X1); \ RL(Y1); \ RU(Y1); \ WU(X1);
#define E2() \ \ RL(Y1); \ RL(Z1); \ RU(Z1); \ RU(Y1);
#define E3() \ \ WL(Z1); \ WL(X1); \ WU(X1); \ WU(Z1);
#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
#undef E1#undef E2#undef E3/* * read-lock / write-lock recursion that is actually safe. */
#define E1() \ \ IRQ_DISABLE(); \ WL(A); \ WU(A); \ IRQ_ENABLE();
#define E2() \ \ RL(A); \ RU(A); \
#define E3() \ \ IRQ_ENTER(); \ LOCK(A); \ L(B); \ U(B); \ UNLOCK(A); \ IRQ_EXIT();
/* * Generate 24 testcases: */#include "locking-selftest-hardirq.h"#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-softirq.h"#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)#endif
#undef E1#undef E2#undef E3
/* * read-lock / write-lock recursion that is unsafe. */
#define E1() \ \ IRQ_DISABLE(); \ L(B); \ LOCK(A); \ UNLOCK(A); \ U(B); \ IRQ_ENABLE();
#define E2() \ \ RL(A); \ RU(A); \
#define E3() \ \ IRQ_ENTER(); \ L(B); \ U(B); \ IRQ_EXIT();
/* * Generate 24 testcases: */#include "locking-selftest-hardirq.h"#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-softirq.h"#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)#endif
#undef E1#undef E2#undef E3/* * read-lock / write-lock recursion that is unsafe. * * A is a ENABLED_*_READ lock * B is a USED_IN_*_READ lock * * read_lock(A); * write_lock(B); * <interrupt> * read_lock(B); * write_lock(A); // if this one is read_lock(), no deadlock */
#define E1() \ \ IRQ_DISABLE(); \ WL(B); \ LOCK(A); \ UNLOCK(A); \ WU(B); \ IRQ_ENABLE();
#define E2() \ \ RL(A); \ RU(A); \
#define E3() \ \ IRQ_ENTER(); \ RL(B); \ RU(B); \ IRQ_EXIT();
/* * Generate 24 testcases: */#include "locking-selftest-hardirq.h"#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
#ifndef CONFIG_PREEMPT_RT#include "locking-selftest-softirq.h"#include "locking-selftest-rlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
#include "locking-selftest-wlock.h"GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)# define I_RAW_SPINLOCK(x) lockdep_reset_lock(&raw_lock_##x.dep_map)# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map)# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map)# define I_WW(x) lockdep_reset_lock(&x.dep_map)# define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map))#ifdef CONFIG_RT_MUTEXES# define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map)#endif#else# define I_SPINLOCK(x)# define I_RAW_SPINLOCK(x)# define I_RWLOCK(x)# define I_MUTEX(x)# define I_RWSEM(x)# define I_WW(x)# define I_LOCAL_LOCK(x)#endif
#ifndef I_RTMUTEX# define I_RTMUTEX(x)#endif
#ifdef CONFIG_RT_MUTEXES#define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x)#else#define I2_RTMUTEX(x)#endif
#define I1(x) \ do { \ I_SPINLOCK(x); \ I_RWLOCK(x); \ I_MUTEX(x); \ I_RWSEM(x); \ I_RTMUTEX(x); \ } while (0)
#define I2(x) \ do { \ spin_lock_init(&lock_##x); \ rwlock_init(&rwlock_##x); \ mutex_init(&mutex_##x); \ init_rwsem(&rwsem_##x); \ I2_RTMUTEX(x); \ } while (0)
static void reset_locks(void){ local_irq_disable(); lockdep_free_key_range(&ww_lockdep.acquire_key, 1); lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
I1(A); I1(B); I1(C); I1(D); I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base); I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B); I_LOCAL_LOCK(A);
lockdep_reset();
I2(A); I2(B); I2(C); I2(D); init_shared_classes(); raw_spin_lock_init(&raw_lock_A); raw_spin_lock_init(&raw_lock_B); local_lock_init(this_cpu_ptr(&local_A));
ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep); memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2)); memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key)); memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key)); local_irq_enable();}
#undef I
static int testcase_total;static int testcase_successes;static int expected_testcase_failures;static int unexpected_testcase_failures;
static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask){ long saved_preempt_count = preempt_count();#ifdef CONFIG_PREEMPT_RT int saved_mgd_count = current->migration_disabled; int saved_rcu_count = current->rcu_read_lock_nesting; int saved_sched_rt_mutex = current->sched_rt_mutex;#endif
WARN_ON(irqs_disabled());
debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
testcase_fn(); /* * Filter out expected failures: */#ifndef CONFIG_PROVE_LOCKING if (expected == FAILURE && debug_locks) { expected_testcase_failures++; pr_cont("failed|"); } else#endif if (debug_locks != expected) { unexpected_testcase_failures++; pr_cont("FAILED|"); } else { testcase_successes++; pr_cont(" ok |"); } testcase_total++;
if (debug_locks_verbose & lockclass_mask) pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n", lockclass_mask, debug_locks, expected); /* * Some tests (e.g. double-unlock) might corrupt the preemption * count, so restore it: */ preempt_count_set(saved_preempt_count);
#ifdef CONFIG_PREEMPT_RT current->sched_rt_mutex = saved_sched_rt_mutex;
while (current->migration_disabled > saved_mgd_count) migrate_enable();
while (current->rcu_read_lock_nesting > saved_rcu_count) rcu_read_unlock(); WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);#endif
#ifdef CONFIG_TRACE_IRQFLAGS if (softirq_count()) current->softirqs_enabled = 0; else current->softirqs_enabled = 1;#endif
reset_locks();}
#ifdef CONFIG_RT_MUTEXES#define dotest_rt(fn, e, m) dotest((fn), (e), (m))#else#define dotest_rt(fn, e, m)#endif
static inline void print_testname(const char *testname){ printk("%33s:", testname);}
#define DO_TESTCASE_1(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_1B(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_1RR(desc, name, nr) \ print_testname(desc"/"#nr); \ pr_cont(" |"); \ dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_1RRB(desc, name, nr) \ print_testname(desc"/"#nr); \ pr_cont(" |"); \ dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_3(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_3RW(desc, name, nr) \ print_testname(desc"/"#nr); \ dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_2RW(desc, name, nr) \ print_testname(desc"/"#nr); \ pr_cont(" |"); \ dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ pr_cont("\n");
#define DO_TESTCASE_2x2RW(desc, name, nr) \ DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \ NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr)) \
#define DO_TESTCASE_6x2x2RW(desc, name) \ DO_TESTCASE_2x2RW(desc, name, 123); \ DO_TESTCASE_2x2RW(desc, name, 132); \ DO_TESTCASE_2x2RW(desc, name, 213); \ DO_TESTCASE_2x2RW(desc, name, 231); \ DO_TESTCASE_2x2RW(desc, name, 312); \ DO_TESTCASE_2x2RW(desc, name, 321);
#define DO_TESTCASE_6(desc, name) \ print_testname(desc); \ dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \ pr_cont("\n");
#define DO_TESTCASE_6_SUCCESS(desc, name) \ print_testname(desc); \ dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \ pr_cont("\n");
/* * 'read' variant: rlocks must not trigger. */#define DO_TESTCASE_6R(desc, name) \ print_testname(desc); \ dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \ pr_cont("\n");
#define DO_TESTCASE_2I(desc, name, nr) \ DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr));
#define DO_TESTCASE_2IB(desc, name, nr) \ DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr));
#define DO_TESTCASE_6I(desc, name, nr) \ DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr));
#define DO_TESTCASE_6IRW(desc, name, nr) \ DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr));
#define DO_TESTCASE_2x3(desc, name) \ DO_TESTCASE_3(desc, name, 12); \ DO_TESTCASE_3(desc, name, 21);
#define DO_TESTCASE_2x6(desc, name) \ DO_TESTCASE_6I(desc, name, 12); \ DO_TESTCASE_6I(desc, name, 21);
#define DO_TESTCASE_6x2(desc, name) \ DO_TESTCASE_2I(desc, name, 123); \ DO_TESTCASE_2I(desc, name, 132); \ DO_TESTCASE_2I(desc, name, 213); \ DO_TESTCASE_2I(desc, name, 231); \ DO_TESTCASE_2I(desc, name, 312); \ DO_TESTCASE_2I(desc, name, 321);
#define DO_TESTCASE_6x2B(desc, name) \ DO_TESTCASE_2IB(desc, name, 123); \ DO_TESTCASE_2IB(desc, name, 132); \ DO_TESTCASE_2IB(desc, name, 213); \ DO_TESTCASE_2IB(desc, name, 231); \ DO_TESTCASE_2IB(desc, name, 312); \ DO_TESTCASE_2IB(desc, name, 321);
#define DO_TESTCASE_6x1RR(desc, name) \ DO_TESTCASE_1RR(desc, name, 123); \ DO_TESTCASE_1RR(desc, name, 132); \ DO_TESTCASE_1RR(desc, name, 213); \ DO_TESTCASE_1RR(desc, name, 231); \ DO_TESTCASE_1RR(desc, name, 312); \ DO_TESTCASE_1RR(desc, name, 321);
#define DO_TESTCASE_6x1RRB(desc, name) \ DO_TESTCASE_1RRB(desc, name, 123); \ DO_TESTCASE_1RRB(desc, name, 132); \ DO_TESTCASE_1RRB(desc, name, 213); \ DO_TESTCASE_1RRB(desc, name, 231); \ DO_TESTCASE_1RRB(desc, name, 312); \ DO_TESTCASE_1RRB(desc, name, 321);
#define DO_TESTCASE_6x6(desc, name) \ DO_TESTCASE_6I(desc, name, 123); \ DO_TESTCASE_6I(desc, name, 132); \ DO_TESTCASE_6I(desc, name, 213); \ DO_TESTCASE_6I(desc, name, 231); \ DO_TESTCASE_6I(desc, name, 312); \ DO_TESTCASE_6I(desc, name, 321);
#define DO_TESTCASE_6x6RW(desc, name) \ DO_TESTCASE_6IRW(desc, name, 123); \ DO_TESTCASE_6IRW(desc, name, 132); \ DO_TESTCASE_6IRW(desc, name, 213); \ DO_TESTCASE_6IRW(desc, name, 231); \ DO_TESTCASE_6IRW(desc, name, 312); \ DO_TESTCASE_6IRW(desc, name, 321);
static void ww_test_fail_acquire(void){ int ret;
WWAI(&t); t.stamp++;
ret = WWL(&o, &t);
if (WARN_ON(!o.ctx) || WARN_ON(ret)) return;
/* No lockdep test, pure API */ ret = WWL(&o, &t); WARN_ON(ret != -EALREADY);
ret = WWT(&o); WARN_ON(ret);
t2 = t; t2.stamp++; ret = WWL(&o, &t2); WARN_ON(ret != -EDEADLK); WWU(&o);
if (WWT(&o)) WWU(&o);#ifdef CONFIG_DEBUG_LOCK_ALLOC else DEBUG_LOCKS_WARN_ON(1);#endif}
#ifdef CONFIG_PREEMPT_RT#define ww_mutex_base_lock(b) rt_mutex_lock(b)#define ww_mutex_base_trylock(b) rt_mutex_trylock(b)#define ww_mutex_base_lock_nest_lock(b, b2) rt_mutex_lock_nest_lock(b, b2)#define ww_mutex_base_lock_interruptible(b) rt_mutex_lock_interruptible(b)#define ww_mutex_base_lock_killable(b) rt_mutex_lock_killable(b)#define ww_mutex_base_unlock(b) rt_mutex_unlock(b)#else#define ww_mutex_base_lock(b) mutex_lock(b)#define ww_mutex_base_trylock(b) mutex_trylock(b)#define ww_mutex_base_lock_nest_lock(b, b2) mutex_lock_nest_lock(b, b2)#define ww_mutex_base_lock_interruptible(b) mutex_lock_interruptible(b)#define ww_mutex_base_lock_killable(b) mutex_lock_killable(b)#define ww_mutex_base_unlock(b) mutex_unlock(b)#endif
static void ww_test_normal(void){ int ret;
/* * None of the ww_mutex codepaths should be taken in the 'normal' * mutex calls. The easiest way to verify this is by using the * normal mutex calls, and making sure o.ctx is unmodified. */
/* mutex_lock (and indirectly, mutex_lock_nested) */ o.ctx = (void *)~0UL; ww_mutex_base_lock(&o.base); ww_mutex_base_unlock(&o.base); WARN_ON(o.ctx != (void *)~0UL);
/* mutex_lock_interruptible (and *_nested) */ o.ctx = (void *)~0UL; ret = ww_mutex_base_lock_interruptible(&o.base); if (!ret) ww_mutex_base_unlock(&o.base); else WARN_ON(1); WARN_ON(o.ctx != (void *)~0UL);
/* mutex_lock_killable (and *_nested) */ o.ctx = (void *)~0UL; ret = ww_mutex_base_lock_killable(&o.base); if (!ret) ww_mutex_base_unlock(&o.base); else WARN_ON(1); WARN_ON(o.ctx != (void *)~0UL);
/* trylock, succeeding */ o.ctx = (void *)~0UL; ret = ww_mutex_base_trylock(&o.base); WARN_ON(!ret); if (ret) ww_mutex_base_unlock(&o.base); else WARN_ON(1); WARN_ON(o.ctx != (void *)~0UL);
/* trylock, failing */ o.ctx = (void *)~0UL; ww_mutex_base_lock(&o.base); ret = ww_mutex_base_trylock(&o.base); WARN_ON(ret); ww_mutex_base_unlock(&o.base); WARN_ON(o.ctx != (void *)~0UL);
WWAI(&t);
/* nest_lock */ o.ctx = (void *)~0UL; ww_mutex_base_lock_nest_lock(&o.base, &t); ww_mutex_base_unlock(&o.base); WARN_ON(o.ctx != (void *)~0UL);}
static void ww_test_two_contexts(void){ WWAI(&t); WWAI(&t2);}
static void ww_test_diff_class(void){ WWAI(&t);#ifdef DEBUG_WW_MUTEXES t.ww_class = NULL;#endif WWL(&o, &t);}
static void ww_test_context_done_twice(void){ WWAI(&t); WWAD(&t); WWAD(&t); WWAF(&t);}
static void ww_test_context_unlock_twice(void){ WWAI(&t); WWAD(&t); WWAF(&t); WWAF(&t);}
static void ww_test_context_fini_early(void){ WWAI(&t); WWL(&o, &t); WWAD(&t); WWAF(&t);}
static void ww_test_context_lock_after_done(void){ WWAI(&t); WWAD(&t); WWL(&o, &t);}
static void ww_test_object_unlock_twice(void){ WWL1(&o); WWU(&o); WWU(&o);}
static void ww_test_object_lock_unbalanced(void){ WWAI(&t); WWL(&o, &t); t.acquired = 0; WWU(&o); WWAF(&t);}
static void ww_test_object_lock_stale_context(void){ WWAI(&t); o.ctx = &t2; WWL(&o, &t);}
static void ww_test_edeadlk_normal(void){ int ret;
ww_mutex_base_lock(&o2.base); o2.ctx = &t2; mutex_release(&o2.base.dep_map, _THIS_IP_);
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base); WWU(&o);
WWL(&o2, &t);}
static void ww_test_edeadlk_normal_slow(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base); WWU(&o);
ww_mutex_lock_slow(&o2, &t);}
static void ww_test_edeadlk_no_unlock(void){ int ret;
ww_mutex_base_lock(&o2.base); o2.ctx = &t2; mutex_release(&o2.base.dep_map, _THIS_IP_);
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base);
WWL(&o2, &t);}
static void ww_test_edeadlk_no_unlock_slow(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
o2.ctx = NULL; mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_); ww_mutex_base_unlock(&o2.base);
ww_mutex_lock_slow(&o2, &t);}
static void ww_test_edeadlk_acquire_more(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
ret = WWL(&o3, &t);}
static void ww_test_edeadlk_acquire_more_slow(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
ww_mutex_lock_slow(&o3, &t);}
static void ww_test_edeadlk_acquire_more_edeadlk(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
ww_mutex_base_lock(&o3.base); mutex_release(&o3.base.dep_map, _THIS_IP_); o3.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
ret = WWL(&o3, &t); WARN_ON(ret != -EDEADLK);}
static void ww_test_edeadlk_acquire_more_edeadlk_slow(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
ww_mutex_base_lock(&o3.base); mutex_release(&o3.base.dep_map, _THIS_IP_); o3.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK);
ww_mutex_lock_slow(&o3, &t);}
static void ww_test_edeadlk_acquire_wrong(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); if (!ret) WWU(&o2);
WWU(&o);
ret = WWL(&o3, &t);}
static void ww_test_edeadlk_acquire_wrong_slow(void){ int ret;
ww_mutex_base_lock(&o2.base); mutex_release(&o2.base.dep_map, _THIS_IP_); o2.ctx = &t2;
WWAI(&t); t2 = t; t2.stamp--;
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret != -EDEADLK); if (!ret) WWU(&o2);
WWU(&o);
ww_mutex_lock_slow(&o3, &t);}
static void ww_test_spin_nest_unlocked(void){ spin_lock_nest_lock(&lock_A, &o.base); U(A);}
/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */static void ww_test_spin_nest_lock(void){ spin_lock(&lock_X1); spin_lock_nest_lock(&lock_Y1, &lock_X1); spin_lock(&lock_A); spin_lock_nest_lock(&lock_Y2, &lock_X1); spin_unlock(&lock_A); spin_unlock(&lock_Y2); spin_unlock(&lock_Y1); spin_unlock(&lock_X1);}
static void ww_test_unneeded_slow(void){ WWAI(&t);
ww_mutex_lock_slow(&o, &t);}
static void ww_test_context_block(void){ int ret;
WWAI(&t);
ret = WWL(&o, &t); WARN_ON(ret); WWL1(&o2);}
static void ww_test_context_try(void){ int ret;
WWAI(&t);
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWT(&o2); WARN_ON(!ret); WWU(&o2); WWU(&o);}
static void ww_test_context_context(void){ int ret;
WWAI(&t);
ret = WWL(&o, &t); WARN_ON(ret);
ret = WWL(&o2, &t); WARN_ON(ret);
WWU(&o2); WWU(&o);}
static void ww_test_try_block(void){ bool ret;
ret = WWT(&o); WARN_ON(!ret);
WWL1(&o2); WWU(&o2); WWU(&o);}
static void ww_test_try_try(void){ bool ret;
ret = WWT(&o); WARN_ON(!ret); ret = WWT(&o2); WARN_ON(!ret); WWU(&o2); WWU(&o);}
static void ww_test_try_context(void){ int ret;
ret = WWT(&o); WARN_ON(!ret);
WWAI(&t);
ret = WWL(&o2, &t); WARN_ON(ret);}
static void ww_test_block_block(void){ WWL1(&o); WWL1(&o2);}
static void ww_test_block_try(void){ bool ret;
WWL1(&o); ret = WWT(&o2); WARN_ON(!ret);}
static void ww_test_block_context(void){ int ret;
WWL1(&o); WWAI(&t);
ret = WWL(&o2, &t); WARN_ON(ret);}
static void ww_test_spin_block(void){ L(A); U(A);
WWL1(&o); L(A); U(A); WWU(&o);
L(A); WWL1(&o); WWU(&o); U(A);}
static void ww_test_spin_try(void){ bool ret;
L(A); U(A);
ret = WWT(&o); WARN_ON(!ret); L(A); U(A); WWU(&o);
L(A); ret = WWT(&o); WARN_ON(!ret); WWU(&o); U(A);}
static void ww_test_spin_context(void){ int ret;
L(A); U(A);
WWAI(&t);
ret = WWL(&o, &t); WARN_ON(ret); L(A); U(A); WWU(&o);
L(A); ret = WWL(&o, &t); WARN_ON(ret); WWU(&o); U(A);}
static void ww_tests(void){ printk(" --------------------------------------------------------------------------\n"); printk(" | Wound/wait tests |\n"); printk(" ---------------------\n");
print_testname("ww api failures"); dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW); dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW); dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("ww contexts mixing"); dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW); dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("finishing ww context"); dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("locking mismatches"); dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW); dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW); dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("EDEADLK handling"); dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW); dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW); dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW); dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("spinlock nest unlocked"); dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("spinlock nest test"); dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW); pr_cont("\n");
printk(" -----------------------------------------------------\n"); printk(" |block | try |context|\n"); printk(" -----------------------------------------------------\n");
print_testname("context"); dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW); pr_cont("\n");
print_testname("try"); dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("block"); dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW); pr_cont("\n");
print_testname("spinlock"); dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW); dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW); dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW); pr_cont("\n");}
/* * <in hardirq handler> * read_lock(&A); * <hardirq disable> * spin_lock(&B); * spin_lock(&B); * read_lock(&A); * * is a deadlock. */static void queued_read_lock_hardirq_RE_Er(void){ HARDIRQ_ENTER(); read_lock(&rwlock_A); LOCK(B); UNLOCK(B); read_unlock(&rwlock_A); HARDIRQ_EXIT();
HARDIRQ_DISABLE(); LOCK(B); read_lock(&rwlock_A); read_unlock(&rwlock_A); UNLOCK(B); HARDIRQ_ENABLE();}
/* * <in hardirq handler> * spin_lock(&B); * <hardirq disable> * read_lock(&A); * read_lock(&A); * spin_lock(&B); * * is not a deadlock. */static void queued_read_lock_hardirq_ER_rE(void){ HARDIRQ_ENTER(); LOCK(B); read_lock(&rwlock_A); read_unlock(&rwlock_A); UNLOCK(B); HARDIRQ_EXIT();
HARDIRQ_DISABLE(); read_lock(&rwlock_A); LOCK(B); UNLOCK(B); read_unlock(&rwlock_A); HARDIRQ_ENABLE();}
/* * <hardirq disable> * spin_lock(&B); * read_lock(&A); * <in hardirq handler> * spin_lock(&B); * read_lock(&A); * * is a deadlock. Because the two read_lock()s are both non-recursive readers. */static void queued_read_lock_hardirq_inversion(void){
HARDIRQ_ENTER(); LOCK(B); UNLOCK(B); HARDIRQ_EXIT();
HARDIRQ_DISABLE(); LOCK(B); read_lock(&rwlock_A); read_unlock(&rwlock_A); UNLOCK(B); HARDIRQ_ENABLE();
read_lock(&rwlock_A); read_unlock(&rwlock_A);}
static void queued_read_lock_tests(void){ printk(" --------------------------------------------------------------------------\n"); printk(" | queued read lock tests |\n"); printk(" ---------------------------\n"); print_testname("hardirq read-lock/lock-read"); dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK); pr_cont("\n");
print_testname("hardirq lock-read/read-lock"); dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK); pr_cont("\n");
print_testname("hardirq inversion"); dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK); pr_cont("\n");}
static void fs_reclaim_correct_nesting(void){ fs_reclaim_acquire(GFP_KERNEL); might_alloc(GFP_NOFS); fs_reclaim_release(GFP_KERNEL);}
static void fs_reclaim_wrong_nesting(void){ fs_reclaim_acquire(GFP_KERNEL); might_alloc(GFP_KERNEL); fs_reclaim_release(GFP_KERNEL);}
static void fs_reclaim_protected_nesting(void){ unsigned int flags;
fs_reclaim_acquire(GFP_KERNEL); flags = memalloc_nofs_save(); might_alloc(GFP_KERNEL); memalloc_nofs_restore(flags); fs_reclaim_release(GFP_KERNEL);}
static void fs_reclaim_tests(void){ printk(" --------------------\n"); printk(" | fs_reclaim tests |\n"); printk(" --------------------\n");
print_testname("correct nesting"); dotest(fs_reclaim_correct_nesting, SUCCESS, 0); pr_cont("\n");
print_testname("wrong nesting"); dotest(fs_reclaim_wrong_nesting, FAILURE, 0); pr_cont("\n");
print_testname("protected nesting"); dotest(fs_reclaim_protected_nesting, SUCCESS, 0); pr_cont("\n");}
/* Defines guard classes to create contexts */DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT())DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ, do { local_irq_disable(); __irq_enter(); WARN_ON(!in_hardirq()); } while(0), HARDIRQ_EXIT())DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT())
/* Define RCU guards, should go away when RCU has its own guard definitions */DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock())DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh())DEFINE_LOCK_GUARD_0(RCU_SCHED, rcu_read_lock_sched(), rcu_read_unlock_sched())
#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \ \static void __maybe_unused inner##_in_##outer(void) \{ \ /* Relies the reversed clean-up ordering: inner first */ \ guard(outer)(outer_lock); \ guard(inner)(inner_lock); \}
/* * wait contexts (considering PREEMPT_RT) * * o: inner is allowed in outer * x: inner is disallowed in outer * * \ inner | RCU | RAW_SPIN | SPIN | MUTEX * outer \ | | | | * ---------------+-------+----------+------+------- * HARDIRQ | o | o | o | x * ---------------+-------+----------+------+------- * NOTTHREADED_IRQ| o | o | x | x * ---------------+-------+----------+------+------- * SOFTIRQ | o | o | o | x * ---------------+-------+----------+------+------- * RCU | o | o | o | x * ---------------+-------+----------+------+------- * RCU_BH | o | o | o | x * ---------------+-------+----------+------+------- * RCU_SCHED | o | o | x | x * ---------------+-------+----------+------+------- * RAW_SPIN | o | o | x | x * ---------------+-------+----------+------+------- * SPIN | o | o | o | x * ---------------+-------+----------+------+------- * MUTEX | o | o | o | o * ---------------+-------+----------+------+------- */
#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(raw_spinlock, &raw_lock_A, inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(spinlock, &lock_A, inner, inner_lock) \GENERATE_2_CONTEXT_TESTCASE(mutex, &mutex_A, inner, inner_lock)
GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(raw_spinlock, &raw_lock_B)GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(spinlock, &lock_B)GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(mutex, &mutex_B)
/* the outer context allows all kinds of preemption */#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \ dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(mutex_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \
/* * the outer context only allows the preemption introduced by spinlock_t (which * is a sleepable lock for PREEMPT_RT) */#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \ dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
/* the outer doesn't allows any kind of preemption */#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \ dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \ dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN); \ dotest(spinlock_in_##outer, FAILURE, LOCKTYPE_SPIN); \ dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
static void wait_context_tests(void){ printk(" --------------------------------------------------------------------------\n"); printk(" | wait context tests |\n"); printk(" --------------------------------------------------------------------------\n"); printk(" | rcu | raw | spin |mutex |\n"); printk(" --------------------------------------------------------------------------\n"); print_testname("in hardirq context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ); pr_cont("\n");
print_testname("in hardirq context (not threaded)"); DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ); pr_cont("\n");
print_testname("in softirq context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ); pr_cont("\n");
print_testname("in RCU context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU); pr_cont("\n");
print_testname("in RCU-bh context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH); pr_cont("\n");
print_testname("in RCU-sched context"); DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED); pr_cont("\n");
print_testname("in RAW_SPINLOCK context"); DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(raw_spinlock); pr_cont("\n");
print_testname("in SPINLOCK context"); DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(spinlock); pr_cont("\n");
print_testname("in MUTEX context"); DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(mutex); pr_cont("\n");}
static void local_lock_2(void){ local_lock(&local_A); /* IRQ-ON */ local_unlock(&local_A);
HARDIRQ_ENTER(); spin_lock(&lock_A); /* IN-IRQ */ spin_unlock(&lock_A); HARDIRQ_EXIT()
HARDIRQ_DISABLE(); spin_lock(&lock_A); local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */ local_unlock(&local_A); spin_unlock(&lock_A); HARDIRQ_ENABLE();}
static void local_lock_3A(void){ local_lock(&local_A); /* IRQ-ON */ spin_lock(&lock_B); /* IRQ-ON */ spin_unlock(&lock_B); local_unlock(&local_A);
HARDIRQ_ENTER(); spin_lock(&lock_A); /* IN-IRQ */ spin_unlock(&lock_A); HARDIRQ_EXIT()
HARDIRQ_DISABLE(); spin_lock(&lock_A); local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */ local_unlock(&local_A); spin_unlock(&lock_A); HARDIRQ_ENABLE();}
static void local_lock_3B(void){ local_lock(&local_A); /* IRQ-ON */ spin_lock(&lock_B); /* IRQ-ON */ spin_unlock(&lock_B); local_unlock(&local_A);
HARDIRQ_ENTER(); spin_lock(&lock_A); /* IN-IRQ */ spin_unlock(&lock_A); HARDIRQ_EXIT()
HARDIRQ_DISABLE(); spin_lock(&lock_A); local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */ local_unlock(&local_A); spin_unlock(&lock_A); HARDIRQ_ENABLE();
HARDIRQ_DISABLE(); spin_lock(&lock_A); spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */ spin_unlock(&lock_B); spin_unlock(&lock_A); HARDIRQ_DISABLE();
}
#ifdef CONFIG_DEBUG_LOCK_ALLOCstatic inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem){ return rwsem->dep_map.name;}#elsestatic inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem){ return NULL;}#endif
static void test_lockdep_set_subclass_name(void){ const char *name_before = rw_semaphore_lockdep_name(&rwsem_X1); const char *name_after;
lockdep_set_subclass(&rwsem_X1, 1); name_after = rw_semaphore_lockdep_name(&rwsem_X1); DEBUG_LOCKS_WARN_ON(name_before != name_after);}
/* * lockdep_set_subclass() should reuse the existing lock class name instead * of creating a new one. */static void lockdep_set_subclass_name_test(void){ printk(" --------------------------------------------------------------------------\n"); printk(" | lockdep_set_subclass() name test|\n"); printk(" -----------------------------------\n");
print_testname("compare name before and after"); dotest(test_lockdep_set_subclass_name, SUCCESS, LOCKTYPE_RWSEM); pr_cont("\n");}
static void local_lock_tests(void){ printk(" --------------------------------------------------------------------------\n"); printk(" | local_lock tests |\n"); printk(" ---------------------\n");
print_testname("local_lock inversion 2"); dotest(local_lock_2, SUCCESS, LOCKTYPE_LL); pr_cont("\n");
print_testname("local_lock inversion 3A"); dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL); pr_cont("\n");
print_testname("local_lock inversion 3B"); dotest(local_lock_3B, FAILURE, LOCKTYPE_LL); pr_cont("\n");}
static void hardirq_deadlock_softirq_not_deadlock(void){ /* mutex_A is hardirq-unsafe and softirq-unsafe */ /* mutex_A -> lock_C */ mutex_lock(&mutex_A); HARDIRQ_DISABLE(); spin_lock(&lock_C); spin_unlock(&lock_C); HARDIRQ_ENABLE(); mutex_unlock(&mutex_A);
/* lock_A is hardirq-safe */ HARDIRQ_ENTER(); spin_lock(&lock_A); spin_unlock(&lock_A); HARDIRQ_EXIT();
/* lock_A -> lock_B */ HARDIRQ_DISABLE(); spin_lock(&lock_A); spin_lock(&lock_B); spin_unlock(&lock_B); spin_unlock(&lock_A); HARDIRQ_ENABLE();
/* lock_B -> lock_C */ HARDIRQ_DISABLE(); spin_lock(&lock_B); spin_lock(&lock_C); spin_unlock(&lock_C); spin_unlock(&lock_B); HARDIRQ_ENABLE();
/* lock_D is softirq-safe */ SOFTIRQ_ENTER(); spin_lock(&lock_D); spin_unlock(&lock_D); SOFTIRQ_EXIT();
/* And lock_D is hardirq-unsafe */ SOFTIRQ_DISABLE(); spin_lock(&lock_D); spin_unlock(&lock_D); SOFTIRQ_ENABLE();
/* * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not * deadlock. * * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe -> * hardirq-unsafe, deadlock. */ HARDIRQ_DISABLE(); spin_lock(&lock_C); spin_lock(&lock_D); spin_unlock(&lock_D); spin_unlock(&lock_C); HARDIRQ_ENABLE();}
void locking_selftest(void){ /* * Got a locking failure before the selftest ran? */ if (!debug_locks) { printk("----------------------------------\n"); printk("| Locking API testsuite disabled |\n"); printk("----------------------------------\n"); return; }
/* * treats read_lock() as recursive read locks for testing purpose */ force_read_lock_recursive = 1;
/* * Run the testsuite: */ printk("------------------------\n"); printk("| Locking API testsuite:\n"); printk("----------------------------------------------------------------------------\n"); printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n"); printk(" --------------------------------------------------------------------------\n");
init_shared_classes(); lockdep_set_selftest_task(current);
DO_TESTCASE_6R("A-A deadlock", AA); DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); DO_TESTCASE_6("double unlock", double_unlock); DO_TESTCASE_6("initialize held", init_held);
printk(" --------------------------------------------------------------------------\n"); print_testname("recursive read-lock"); pr_cont(" |"); dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n");
print_testname("recursive read-lock #2"); pr_cont(" |"); dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n");
print_testname("mixed read-write-lock"); pr_cont(" |"); dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n");
print_testname("mixed write-read-lock"); pr_cont(" |"); dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); pr_cont("\n");
print_testname("mixed read-lock/lock-write ABBA"); pr_cont(" |"); dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
print_testname("mixed read-lock/lock-read ABBA"); pr_cont(" |"); dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
print_testname("mixed write-lock/lock-write ABBA"); pr_cont(" |"); dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK); pr_cont(" |"); dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
print_testname("chain cached mixed R-L/L-W ABBA"); pr_cont(" |"); dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1); DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1); DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1); DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
printk(" --------------------------------------------------------------------------\n"); /* * irq-context testcases: */ DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A)); DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion); DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2); DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
ww_tests();
force_read_lock_recursive = 0; /* * queued_read_lock() specific test cases can be put here */ if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS)) queued_read_lock_tests();
fs_reclaim_tests();
/* Wait context test cases that are specific for RAW_LOCK_NESTING */ if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING)) wait_context_tests();
local_lock_tests();
print_testname("hardirq_unsafe_softirq_safe"); dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL); pr_cont("\n");
lockdep_set_subclass_name_test();
if (unexpected_testcase_failures) { printk("-----------------------------------------------------------------\n"); debug_locks = 0; printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", unexpected_testcase_failures, testcase_total); printk("-----------------------------------------------------------------\n"); } else if (expected_testcase_failures && testcase_successes) { printk("--------------------------------------------------------\n"); printk("%3d out of %3d testcases failed, as expected. |\n", expected_testcase_failures, testcase_total); printk("----------------------------------------------------\n"); debug_locks = 1; } else if (expected_testcase_failures && !testcase_successes) { printk("--------------------------------------------------------\n"); printk("All %3d testcases failed, as expected. |\n", expected_testcase_failures); printk("----------------------------------------\n"); debug_locks = 1; } else { printk("-------------------------------------------------------\n"); printk("Good, all %3d testcases passed! |\n", testcase_successes); printk("---------------------------------\n"); debug_locks = 1; } lockdep_set_selftest_task(NULL); debug_locks_silent = 0;}