Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / locking / mcs_spinlock.h

diff --git a/kernel/kernel/locking/mcs_spinlock.h b/kernel/kernel/locking/mcs_spinlock.h
new file mode 100644 (file)
index 0000000..75e114b
--- /dev/null
+++ b/kernel/kernel/locking/mcs_spinlock.h
@@ -0,0 +1,111 @@
+/*
+ * MCS lock defines
+ *
+ * This file contains the main data structure and API definitions of MCS lock.
+ *
+ * The MCS lock (proposed by Mellor-Crummey and Scott) is a simple spin-lock
+ * with the desirable properties of being fair, and with each cpu trying
+ * to acquire the lock spinning on a local variable.
+ * It avoids expensive cache bouncings that common test-and-set spin-lock
+ * implementations incur.
+ */
+#ifndef __LINUX_MCS_SPINLOCK_H
+#define __LINUX_MCS_SPINLOCK_H
+
+#include <asm/mcs_spinlock.h>
+
+struct mcs_spinlock {
+       struct mcs_spinlock *next;
+       int locked; /* 1 if lock acquired */
+};
+
+#ifndef arch_mcs_spin_lock_contended
+/*
+ * Using smp_load_acquire() provides a memory barrier that ensures
+ * subsequent operations happen after the lock is acquired.
+ */
+#define arch_mcs_spin_lock_contended(l)                                        \
+do {                                                                   \
+       while (!(smp_load_acquire(l)))                                  \
+               cpu_relax_lowlatency();                                 \
+} while (0)
+#endif
+
+#ifndef arch_mcs_spin_unlock_contended
+/*
+ * smp_store_release() provides a memory barrier to ensure all
+ * operations in the critical section has been completed before
+ * unlocking.
+ */
+#define arch_mcs_spin_unlock_contended(l)                              \
+       smp_store_release((l), 1)
+#endif
+
+/*
+ * Note: the smp_load_acquire/smp_store_release pair is not
+ * sufficient to form a full memory barrier across
+ * cpus for many architectures (except x86) for mcs_unlock and mcs_lock.
+ * For applications that need a full barrier across multiple cpus
+ * with mcs_unlock and mcs_lock pair, smp_mb__after_unlock_lock() should be
+ * used after mcs_lock.
+ */
+
+/*
+ * In order to acquire the lock, the caller should declare a local node and
+ * pass a reference of the node to this function in addition to the lock.
+ * If the lock has already been acquired, then this will proceed to spin
+ * on this node->locked until the previous lock holder sets the node->locked
+ * in mcs_spin_unlock().
+ */
+static inline
+void mcs_spin_lock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
+{
+       struct mcs_spinlock *prev;
+
+       /* Init node */
+       node->locked = 0;
+       node->next   = NULL;
+
+       prev = xchg(lock, node);
+       if (likely(prev == NULL)) {
+               /*
+                * Lock acquired, don't need to set node->locked to 1. Threads
+                * only spin on its own node->locked value for lock acquisition.
+                * However, since this thread can immediately acquire the lock
+                * and does not proceed to spin on its own node->locked, this
+                * value won't be used. If a debug mode is needed to
+                * audit lock status, then set node->locked value here.
+                */
+               return;
+       }
+       WRITE_ONCE(prev->next, node);
+
+       /* Wait until the lock holder passes the lock down. */
+       arch_mcs_spin_lock_contended(&node->locked);
+}
+
+/*
+ * Releases the lock. The caller should pass in the corresponding node that
+ * was used to acquire the lock.
+ */
+static inline
+void mcs_spin_unlock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
+{
+       struct mcs_spinlock *next = READ_ONCE(node->next);
+
+       if (likely(!next)) {
+               /*
+                * Release the lock by setting it to NULL
+                */
+               if (likely(cmpxchg(lock, node, NULL) == node))
+                       return;
+               /* Wait until the next pointer is set */
+               while (!(next = READ_ONCE(node->next)))
+                       cpu_relax_lowlatency();
+       }
+
+       /* Pass lock to next waiter. */
+       arch_mcs_spin_unlock_contended(&next->locked);
+}
+
+#endif /* __LINUX_MCS_SPINLOCK_H */