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-rw-r--r--lib/spinlock_debug.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c
new file mode 100644
index 000000000..dc894bfa3
--- /dev/null
+++ b/lib/spinlock_debug.c
@@ -0,0 +1,367 @@
+/*
+ * Copyright 2005, Red Hat, Inc., Ingo Molnar
+ * Released under the General Public License (GPL).
+ *
+ * This file contains the spinlock/rwlock implementations for
+ * DEBUG_SPINLOCK.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/nmi.h>
+#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/aee.h>
+
+extern int InDumpAllStack;
+
+
+void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held lock:
+ */
+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+ lockdep_init_map(&lock->dep_map, name, key, 0);
+#endif
+ lock->raw_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
+ lock->magic = SPINLOCK_MAGIC;
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+EXPORT_SYMBOL(__raw_spin_lock_init);
+
+void __rwlock_init(rwlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ /*
+ * Make sure we are not reinitializing a held lock:
+ */
+ debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+ lockdep_init_map(&lock->dep_map, name, key, 0);
+#endif
+ lock->raw_lock = (arch_rwlock_t) __ARCH_RW_LOCK_UNLOCKED;
+ lock->magic = RWLOCK_MAGIC;
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+EXPORT_SYMBOL(__rwlock_init);
+
+static void spin_dump(raw_spinlock_t *lock, const char *msg)
+{
+ struct task_struct *owner = NULL;
+
+ if (lock->owner && lock->owner != SPINLOCK_OWNER_INIT)
+ owner = lock->owner;
+ printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n",
+ msg, raw_smp_processor_id(),
+ current->comm, task_pid_nr(current));
+ printk(KERN_EMERG " lock: %pS, .magic: %08x, .owner: %s/%d, "
+ ".owner_cpu: %d value:0x%08x\n",
+ lock, lock->magic,
+ owner ? owner->comm : "<none>",
+ owner ? task_pid_nr(owner) : -1,
+ lock->owner_cpu, *((unsigned int *)&lock->raw_lock));
+ dump_stack();
+}
+
+static void spin_bug(raw_spinlock_t *lock, const char *msg)
+{
+ char aee_str[50];
+// if (!debug_locks_off())
+// return;
+
+ spin_dump(lock, msg);
+ snprintf( aee_str, 50, "Spinlock %s :%s\n", current->comm, msg);
+ if(!strcmp(msg,"bad magic")){
+ printk("[spin lock debug] bad magic:%08x, should be %08x, may use an un-initial spin_lock or mem corrupt\n", lock->magic, SPINLOCK_MAGIC);
+ printk(">>>>>>>>>>>>>> Let's KE <<<<<<<<<<<<<<\n");
+ BUG_ON(1);
+ }
+ aee_kernel_warning_api(__FILE__, __LINE__, DB_OPT_DUMMY_DUMP | DB_OPT_FTRACE, aee_str,"spinlock debugger\n");
+}
+
+#define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg)
+
+static inline void
+debug_spin_lock_before(raw_spinlock_t *lock)
+{
+ SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
+ SPIN_BUG_ON(lock->owner == current, lock, "recursion");
+ SPIN_BUG_ON(lock->owner_cpu == raw_smp_processor_id(),
+ lock, "cpu recursion");
+}
+
+static inline void debug_spin_lock_after(raw_spinlock_t *lock)
+{
+ lock->owner_cpu = raw_smp_processor_id();
+ lock->owner = current;
+}
+
+static inline void debug_spin_unlock(raw_spinlock_t *lock)
+{
+ SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
+ SPIN_BUG_ON(!raw_spin_is_locked(lock), lock, "already unlocked");
+ SPIN_BUG_ON(lock->owner != current, lock, "wrong owner");
+ SPIN_BUG_ON(lock->owner_cpu != raw_smp_processor_id(),
+ lock, "wrong CPU");
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+/*
+ Select appropriate loop counts to 1~2sec
+*/
+#if HZ == 100
+#define LOOP_HZ 100 // temp 10
+#elif HZ == 10
+#define LOOP_HZ 2 // temp 2
+#else
+#define LOOP_HZ HZ
+#endif
+#define WARNING_TIME 1000000000 // warning time 1 seconds
+static void __spin_lock_debug(raw_spinlock_t *lock)
+{
+#ifdef CONFIG_MTK_MUTATION
+ u64 i;
+ u64 loops = loops_per_jiffy * LOOP_HZ;
+ int print_once = 1;
+ char aee_str[50];
+ unsigned long long t1,t2,t3;
+ t1 = sched_clock();
+ t2 = t1;
+ for (;;) {
+ for (i = 0; i < loops; i++) {
+ if (arch_spin_trylock(&lock->raw_lock))
+ return;
+ __delay(1);
+ }
+ t3 = sched_clock();
+ if(t3 < t2)
+ continue;
+ else if(t3 - t2 < WARNING_TIME)
+ continue;
+ //if(sched_clock() - t2 < WARNING_TIME) continue;
+ t2 = sched_clock();
+#ifdef CONFIG_MTK_AEE_FEATURE
+ if((oops_in_progress != 0) || (InDumpAllStack == 1)) continue; // in exception follow, printk maybe spinlock error
+#else
+ if(oops_in_progress != 0) continue; // in exception follow, printk maybe spinlock error
+#endif
+ /* lockup suspected: */
+ printk("spin time: %llu ns(start:%llu ns, lpj:%lu, LPHZ:%d), value: 0x%08x\n", sched_clock() - t1, t1, loops_per_jiffy, (int)LOOP_HZ, *((unsigned int *)&lock->raw_lock));
+ if (print_once) {
+ print_once = 0;
+ spin_dump(lock, "lockup suspected");
+#ifdef CONFIG_SMP
+ trigger_all_cpu_backtrace();
+#endif
+ debug_show_all_locks();
+ snprintf( aee_str, 50, "Spinlock lockup:%s\n", current->comm);
+ aee_kernel_warning_api(__FILE__, __LINE__, DB_OPT_DUMMY_DUMP | DB_OPT_FTRACE, aee_str,"spinlock debugger\n");
+
+ }
+ }
+#else //CONFIG_MTK_MUTATION
+ u64 i;
+ u64 loops = loops_per_jiffy * HZ;
+ for (i = 0; i < loops; i++) {
+ if (arch_spin_trylock(&lock->raw_lock))
+ return;
+ __delay(1);
+ }
+ /* lockup suspected: */
+ spin_dump(lock, "lockup suspected");
+#ifdef CONFIG_SMP
+ trigger_all_cpu_backtrace();
+#endif
+
+ /*
+ * The trylock above was causing a livelock. Give the lower level arch
+ * specific lock code a chance to acquire the lock. We have already
+ * printed a warning/backtrace at this point. The non-debug arch
+ * specific code might actually succeed in acquiring the lock. If it is
+ * not successful, the end-result is the same - there is no forward
+ * progress.
+ */
+ arch_spin_lock(&lock->raw_lock);
+#endif //CONFIG_MTK_MUTATION
+}
+
+void do_raw_spin_lock(raw_spinlock_t *lock)
+{
+ debug_spin_lock_before(lock);
+ if (unlikely(!arch_spin_trylock(&lock->raw_lock)))
+ __spin_lock_debug(lock);
+ debug_spin_lock_after(lock);
+}
+
+int do_raw_spin_trylock(raw_spinlock_t *lock)
+{
+ int ret = arch_spin_trylock(&lock->raw_lock);
+
+ if (ret)
+ debug_spin_lock_after(lock);
+#ifndef CONFIG_SMP
+ /*
+ * Must not happen on UP:
+ */
+ SPIN_BUG_ON(!ret, lock, "trylock failure on UP");
+#endif
+ return ret;
+}
+
+void do_raw_spin_unlock(raw_spinlock_t *lock)
+{
+ debug_spin_unlock(lock);
+ arch_spin_unlock(&lock->raw_lock);
+}
+
+static void rwlock_bug(rwlock_t *lock, const char *msg)
+{
+ if (!debug_locks_off())
+ return;
+
+ printk(KERN_EMERG "BUG: rwlock %s on CPU#%d, %s/%d, %p\n",
+ msg, raw_smp_processor_id(), current->comm,
+ task_pid_nr(current), lock);
+ dump_stack();
+}
+
+#define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg)
+
+#if 0 /* __write_lock_debug() can lock up - maybe this can too? */
+static void __read_lock_debug(rwlock_t *lock)
+{
+ u64 i;
+ u64 loops = loops_per_jiffy * HZ;
+ int print_once = 1;
+
+ for (;;) {
+ for (i = 0; i < loops; i++) {
+ if (arch_read_trylock(&lock->raw_lock))
+ return;
+ __delay(1);
+ }
+ /* lockup suspected: */
+ if (print_once) {
+ print_once = 0;
+ printk(KERN_EMERG "BUG: read-lock lockup on CPU#%d, "
+ "%s/%d, %p\n",
+ raw_smp_processor_id(), current->comm,
+ current->pid, lock);
+ dump_stack();
+ }
+ }
+}
+#endif
+
+void do_raw_read_lock(rwlock_t *lock)
+{
+ RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
+ arch_read_lock(&lock->raw_lock);
+}
+
+int do_raw_read_trylock(rwlock_t *lock)
+{
+ int ret = arch_read_trylock(&lock->raw_lock);
+
+#ifndef CONFIG_SMP
+ /*
+ * Must not happen on UP:
+ */
+ RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP");
+#endif
+ return ret;
+}
+
+void do_raw_read_unlock(rwlock_t *lock)
+{
+ RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
+ arch_read_unlock(&lock->raw_lock);
+}
+
+static inline void debug_write_lock_before(rwlock_t *lock)
+{
+ RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
+ RWLOCK_BUG_ON(lock->owner == current, lock, "recursion");
+ RWLOCK_BUG_ON(lock->owner_cpu == raw_smp_processor_id(),
+ lock, "cpu recursion");
+}
+
+static inline void debug_write_lock_after(rwlock_t *lock)
+{
+ lock->owner_cpu = raw_smp_processor_id();
+ lock->owner = current;
+}
+
+static inline void debug_write_unlock(rwlock_t *lock)
+{
+ RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
+ RWLOCK_BUG_ON(lock->owner != current, lock, "wrong owner");
+ RWLOCK_BUG_ON(lock->owner_cpu != raw_smp_processor_id(),
+ lock, "wrong CPU");
+ lock->owner = SPINLOCK_OWNER_INIT;
+ lock->owner_cpu = -1;
+}
+
+#if 0 /* This can cause lockups */
+static void __write_lock_debug(rwlock_t *lock)
+{
+ u64 i;
+ u64 loops = loops_per_jiffy * HZ;
+ int print_once = 1;
+
+ for (;;) {
+ for (i = 0; i < loops; i++) {
+ if (arch_write_trylock(&lock->raw_lock))
+ return;
+ __delay(1);
+ }
+ /* lockup suspected: */
+ if (print_once) {
+ print_once = 0;
+ printk(KERN_EMERG "BUG: write-lock lockup on CPU#%d, "
+ "%s/%d, %p\n",
+ raw_smp_processor_id(), current->comm,
+ current->pid, lock);
+ dump_stack();
+ }
+ }
+}
+#endif
+
+void do_raw_write_lock(rwlock_t *lock)
+{
+ debug_write_lock_before(lock);
+ arch_write_lock(&lock->raw_lock);
+ debug_write_lock_after(lock);
+}
+
+int do_raw_write_trylock(rwlock_t *lock)
+{
+ int ret = arch_write_trylock(&lock->raw_lock);
+
+ if (ret)
+ debug_write_lock_after(lock);
+#ifndef CONFIG_SMP
+ /*
+ * Must not happen on UP:
+ */
+ RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP");
+#endif
+ return ret;
+}
+
+void do_raw_write_unlock(rwlock_t *lock)
+{
+ debug_write_unlock(lock);
+ arch_write_unlock(&lock->raw_lock);
+}
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