[S390] move include/asm-s390 to arch/s390/include/asm

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 387 insertions, 0 deletions

diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h
new file mode 100644
index 000000000000..9d2a17971805
--- /dev/null
+++ b/arch/s390/include/asm/rwsem.h
@@ -0,0 +1,387 @@
+#ifndef _S390_RWSEM_H
+#define _S390_RWSEM_H
+
+/*
+ *  include/asm-s390/rwsem.h
+ *
+ *  S390 version
+ *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Based on asm-alpha/semaphore.h and asm-i386/rwsem.h
+ */
+
+/*
+ *
+ * The MSW of the count is the negated number of active writers and waiting
+ * lockers, and the LSW is the total number of active locks
+ *
+ * The lock count is initialized to 0 (no active and no waiting lockers).
+ *
+ * When a writer subtracts WRITE_BIAS, it'll get 0xffff0001 for the case of an
+ * uncontended lock. This can be determined because XADD returns the old value.
+ * Readers increment by 1 and see a positive value when uncontended, negative
+ * if there are writers (and maybe) readers waiting (in which case it goes to
+ * sleep).
+ *
+ * The value of WAITING_BIAS supports up to 32766 waiting processes. This can
+ * be extended to 65534 by manually checking the whole MSW rather than relying
+ * on the S flag.
+ *
+ * The value of ACTIVE_BIAS supports up to 65535 active processes.
+ *
+ * This should be totally fair - if anything is waiting, a process that wants a
+ * lock will go to the back of the queue. When the currently active lock is
+ * released, if there's a writer at the front of the queue, then that and only
+ * that will be woken up; if there's a bunch of consequtive readers at the
+ * front, then they'll all be woken up, but no other readers will be.
+ */
+
+#ifndef _LINUX_RWSEM_H
+#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
+#endif
+
+#ifdef __KERNEL__
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+struct rwsem_waiter;
+
+extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *);
+extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *);
+extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *);
+extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *);
+extern struct rw_semaphore *rwsem_downgrade_write(struct rw_semaphore *);
+
+/*
+ * the semaphore definition
+ */
+struct rw_semaphore {
+        signed long             count;
+        spinlock_t              wait_lock;
+        struct list_head        wait_list;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+        struct lockdep_map      dep_map;
+#endif
+};
+
+#ifndef __s390x__
+#define RWSEM_UNLOCKED_VALUE    0x00000000
+#define RWSEM_ACTIVE_BIAS       0x00000001
+#define RWSEM_ACTIVE_MASK       0x0000ffff
+#define RWSEM_WAITING_BIAS      (-0x00010000)
+#else /* __s390x__ */
+#define RWSEM_UNLOCKED_VALUE    0x0000000000000000L
+#define RWSEM_ACTIVE_BIAS       0x0000000000000001L
+#define RWSEM_ACTIVE_MASK       0x00000000ffffffffL
+#define RWSEM_WAITING_BIAS      (-0x0000000100000000L)
+#endif /* __s390x__ */
+#define RWSEM_ACTIVE_READ_BIAS  RWSEM_ACTIVE_BIAS
+#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+
+/*
+ * initialisation
+ */
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define __RWSEM_DEP_MAP_INIT(lockname) , .dep_map = { .name = #lockname }
+#else
+# define __RWSEM_DEP_MAP_INIT(lockname)
+#endif
+
+#define __RWSEM_INITIALIZER(name) \
+ { RWSEM_UNLOCKED_VALUE, __SPIN_LOCK_UNLOCKED((name).wait.lock), \
+   LIST_HEAD_INIT((name).wait_list) __RWSEM_DEP_MAP_INIT(name) }
+
+#define DECLARE_RWSEM(name) \
+        struct rw_semaphore name = __RWSEM_INITIALIZER(name)
+
+static inline void init_rwsem(struct rw_semaphore *sem)
+{
+        sem->count = RWSEM_UNLOCKED_VALUE;
+        spin_lock_init(&sem->wait_lock);
+        INIT_LIST_HEAD(&sem->wait_list);
+}
+
+extern void __init_rwsem(struct rw_semaphore *sem, const char *name,
+                         struct lock_class_key *key);
+
+#define init_rwsem(sem)                         \
+do {                                            \
+        static struct lock_class_key __key;     \
+                                                \
+        __init_rwsem((sem), #sem, &__key);      \
+} while (0)
+
+
+/*
+ * lock for reading
+ */
+static inline void __down_read(struct rw_semaphore *sem)
+{
+        signed long old, new;
+
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       ahi     %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       aghi    %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count),
+                  "i" (RWSEM_ACTIVE_READ_BIAS) : "cc", "memory");
+        if (old < 0)
+                rwsem_down_read_failed(sem);
+}
+
+/*
+ * trylock for reading -- returns 1 if successful, 0 if contention
+ */
+static inline int __down_read_trylock(struct rw_semaphore *sem)
+{
+        signed long old, new;
+
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     ltr     %1,%0\n"
+                "       jm      1f\n"
+                "       ahi     %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b\n"
+                "1:"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     ltgr    %1,%0\n"
+                "       jm      1f\n"
+                "       aghi    %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b\n"
+                "1:"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count),
+                  "i" (RWSEM_ACTIVE_READ_BIAS) : "cc", "memory");
+        return old >= 0 ? 1 : 0;
+}
+
+/*
+ * lock for writing
+ */
+static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
+{
+        signed long old, new, tmp;
+
+        tmp = RWSEM_ACTIVE_WRITE_BIAS;
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       a       %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       ag      %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count), "m" (tmp)
+                : "cc", "memory");
+        if (old != 0)
+                rwsem_down_write_failed(sem);
+}
+
+static inline void __down_write(struct rw_semaphore *sem)
+{
+        __down_write_nested(sem, 0);
+}
+
+/*
+ * trylock for writing -- returns 1 if successful, 0 if contention
+ */
+static inline int __down_write_trylock(struct rw_semaphore *sem)
+{
+        signed long old;
+
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%2)\n"
+                "0:     ltr     %0,%0\n"
+                "       jnz     1f\n"
+                "       cs      %0,%4,0(%2)\n"
+                "       jl      0b\n"
+#else /* __s390x__ */
+                "       lg      %0,0(%2)\n"
+                "0:     ltgr    %0,%0\n"
+                "       jnz     1f\n"
+                "       csg     %0,%4,0(%2)\n"
+                "       jl      0b\n"
+#endif /* __s390x__ */
+                "1:"
+                : "=&d" (old), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count),
+                  "d" (RWSEM_ACTIVE_WRITE_BIAS) : "cc", "memory");
+        return (old == RWSEM_UNLOCKED_VALUE) ? 1 : 0;
+}
+
+/*
+ * unlock after reading
+ */
+static inline void __up_read(struct rw_semaphore *sem)
+{
+        signed long old, new;
+
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       ahi     %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       aghi    %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count),
+                  "i" (-RWSEM_ACTIVE_READ_BIAS)
+                : "cc", "memory");
+        if (new < 0)
+                if ((new & RWSEM_ACTIVE_MASK) == 0)
+                        rwsem_wake(sem);
+}
+
+/*
+ * unlock after writing
+ */
+static inline void __up_write(struct rw_semaphore *sem)
+{
+        signed long old, new, tmp;
+
+        tmp = -RWSEM_ACTIVE_WRITE_BIAS;
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       a       %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       ag      %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count), "m" (tmp)
+                : "cc", "memory");
+        if (new < 0)
+                if ((new & RWSEM_ACTIVE_MASK) == 0)
+                        rwsem_wake(sem);
+}
+
+/*
+ * downgrade write lock to read lock
+ */
+static inline void __downgrade_write(struct rw_semaphore *sem)
+{
+        signed long old, new, tmp;
+
+        tmp = -RWSEM_WAITING_BIAS;
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       a       %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       ag      %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count), "m" (tmp)
+                : "cc", "memory");
+        if (new > 1)
+                rwsem_downgrade_wake(sem);
+}
+
+/*
+ * implement atomic add functionality
+ */
+static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem)
+{
+        signed long old, new;
+
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       ar      %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       agr     %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count), "d" (delta)
+                : "cc", "memory");
+}
+
+/*
+ * implement exchange and add functionality
+ */
+static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem)
+{
+        signed long old, new;
+
+        asm volatile(
+#ifndef __s390x__
+                "       l       %0,0(%3)\n"
+                "0:     lr      %1,%0\n"
+                "       ar      %1,%5\n"
+                "       cs      %0,%1,0(%3)\n"
+                "       jl      0b"
+#else /* __s390x__ */
+                "       lg      %0,0(%3)\n"
+                "0:     lgr     %1,%0\n"
+                "       agr     %1,%5\n"
+                "       csg     %0,%1,0(%3)\n"
+                "       jl      0b"
+#endif /* __s390x__ */
+                : "=&d" (old), "=&d" (new), "=m" (sem->count)
+                : "a" (&sem->count), "m" (sem->count), "d" (delta)
+                : "cc", "memory");
+        return new;
+}
+
+static inline int rwsem_is_locked(struct rw_semaphore *sem)
+{
+        return (sem->count != 0);
+}
+
+#endif /* __KERNEL__ */
+#endif /* _S390_RWSEM_H */