--- /dev/null
+/*
+ * 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/sched.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
+#include <linux/irqflags.h>
+
+/*
+ * Change this to 1 if you want to see the failure printouts:
+ */
+static unsigned int debug_locks_verbose;
+
+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
+
+/*
+ * 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_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);
+
+/*
+ * 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);
+
+/*
+ * 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)
+{
+ 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(); \
+ WARN_ON(!in_irq());
+
+#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(); \
+ trace_softirq_enter(); \
+ WARN_ON(!in_softirq());
+
+#define SOFTIRQ_EXIT() \
+ trace_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 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)
+
+#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)
+
+#undef E
+
+/*
+ * Special-case for read-locking, they are
+ * allowed to recurse on the same lock instance:
+ */
+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 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
+}
+
+/*
+ * 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)
+
+#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)
+
+#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)
+
+#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)
+
+#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)
+
+#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)
+
+#undef E
+
+/*
+ * Double unlock:
+ */
+#define E() \
+ \
+ LOCK(A); \
+ 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)
+
+#undef E
+
+/*
+ * Bad unlock ordering:
+ */
+#define E() \
+ \
+ LOCK(A); \
+ LOCK(B); \
+ UNLOCK(A); /* fail */ \
+ UNLOCK(B);
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(bad_unlock_order_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(bad_unlock_order_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(bad_unlock_order_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(bad_unlock_order_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(bad_unlock_order_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(bad_unlock_order_rsem)
+
+#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)
+
+#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)
+
+#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)
+
+#undef E1
+#undef E2
+
+/*
+ * 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
+
+/*
+ * 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)
+
+#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)
+
+#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)
+
+#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)
+
+#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)
+
+#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)
+
+#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)
+
+#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)
+
+#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(); \
+ RL(A); \
+ L(B); \
+ U(B); \
+ RU(A); \
+ IRQ_EXIT();
+
+/*
+ * Generate 12 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard)
+
+#include "locking-selftest-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * read-lock / write-lock recursion that is unsafe.
+ */
+
+#define E1() \
+ \
+ IRQ_DISABLE(); \
+ L(B); \
+ WL(A); \
+ WU(A); \
+ U(B); \
+ IRQ_ENABLE();
+
+#define E2() \
+ \
+ RL(A); \
+ RU(A); \
+
+#define E3() \
+ \
+ IRQ_ENTER(); \
+ L(B); \
+ U(B); \
+ IRQ_EXIT();
+
+/*
+ * Generate 12 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard)
+
+#include "locking-selftest-softirq.h"
+// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft)
+
+#define lockdep_reset()
+#define lockdep_reset_lock(x)
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define I_SPINLOCK(x) lockdep_reset_lock(&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)
+#else
+# define I_SPINLOCK(x)
+# define I_RWLOCK(x)
+# define I_MUTEX(x)
+# define I_RWSEM(x)
+#endif
+
+#define I1(x) \
+ do { \
+ I_SPINLOCK(x); \
+ I_RWLOCK(x); \
+ I_MUTEX(x); \
+ I_RWSEM(x); \
+ } while (0)
+
+#define I2(x) \
+ do { \
+ spin_lock_init(&lock_##x); \
+ rwlock_init(&rwlock_##x); \
+ mutex_init(&mutex_##x); \
+ init_rwsem(&rwsem_##x); \
+ } while (0)
+
+static void reset_locks(void)
+{
+ local_irq_disable();
+ I1(A); I1(B); I1(C); I1(D);
+ I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
+ lockdep_reset();
+ I2(A); I2(B); I2(C); I2(D);
+ init_shared_classes();
+ 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)
+{
+ unsigned long saved_preempt_count = preempt_count();
+ int expected_failure = 0;
+
+ WARN_ON(irqs_disabled());
+
+ testcase_fn();
+ /*
+ * Filter out expected failures:
+ */
+#ifndef CONFIG_PROVE_LOCKING
+ if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected)
+ expected_failure = 1;
+ if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected)
+ expected_failure = 1;
+ if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected)
+ expected_failure = 1;
+ if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected)
+ expected_failure = 1;
+#endif
+ if (debug_locks != expected) {
+ if (expected_failure) {
+ expected_testcase_failures++;
+ printk("failed|");
+ } else {
+ unexpected_testcase_failures++;
+ printk("FAILED|");
+ }
+ } else {
+ testcase_successes++;
+ printk(" ok |");
+ }
+ testcase_total++;
+
+ if (debug_locks_verbose)
+ printk(" 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() = saved_preempt_count;
+#ifdef CONFIG_TRACE_IRQFLAGS
+ if (softirq_count())
+ current->softirqs_enabled = 0;
+ else
+ current->softirqs_enabled = 1;
+#endif
+
+ reset_locks();
+}
+
+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); \
+ printk("\n");
+
+#define DO_TESTCASE_1B(desc, name, nr) \
+ print_testname(desc"/"#nr); \
+ dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
+ printk("\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); \
+ printk("\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); \
+ printk("\n");
+
+#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); \
+ printk("\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); \
+ printk("\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); \
+ printk("\n");
+
+#define DO_TESTCASE_2I(desc, name, nr) \
+ DO_TESTCASE_1("hard-"desc, name##_hard, nr); \
+ DO_TESTCASE_1("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_2IB(desc, name, nr) \
+ DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \
+ DO_TESTCASE_1B("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_6I(desc, name, nr) \
+ DO_TESTCASE_3("hard-"desc, name##_hard, nr); \
+ DO_TESTCASE_3("soft-"desc, name##_soft, nr);
+
+#define DO_TESTCASE_6IRW(desc, name, nr) \
+ DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \
+ 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_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);
+
+
+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;
+ }
+
+ /*
+ * Run the testsuite:
+ */
+ printk("------------------------\n");
+ printk("| Locking API testsuite:\n");
+ printk("----------------------------------------------------------------------------\n");
+ printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n");
+ printk(" --------------------------------------------------------------------------\n");
+
+ init_shared_classes();
+ debug_locks_silent = !debug_locks_verbose;
+
+ DO_TESTCASE_6("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);
+ DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order);
+
+ printk(" --------------------------------------------------------------------------\n");
+ print_testname("recursive read-lock");
+ printk(" |");
+ dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
+ printk(" |");
+ dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
+ printk("\n");
+
+ print_testname("recursive read-lock #2");
+ printk(" |");
+ dotest(rlock_AA1B, FAILURE, LOCKTYPE_RWLOCK);
+ printk(" |");
+ dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
+ printk("\n");
+
+ print_testname("mixed read-write-lock");
+ printk(" |");
+ dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
+ printk(" |");
+ dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
+ printk("\n");
+
+ print_testname("mixed write-read-lock");
+ printk(" |");
+ dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
+ printk(" |");
+ dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
+ printk("\n");
+
+ printk(" --------------------------------------------------------------------------\n");
+
+ /*
+ * irq-context testcases:
+ */
+ DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
+ 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_6x2("irq read-recursion", irq_read_recursion);
+// DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
+
+ 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;
+ }
+ debug_locks_silent = 0;
+}
projects / cascardo / linux.git / commitdiff