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Diffstat (limited to 'arch/ia64/include/asm/spinlock.h')
-rw-r--r--arch/ia64/include/asm/spinlock.h276
1 files changed, 0 insertions, 276 deletions
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h
deleted file mode 100644
index 5f620e66384e..000000000000
--- a/arch/ia64/include/asm/spinlock.h
+++ /dev/null
@@ -1,276 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_IA64_SPINLOCK_H
-#define _ASM_IA64_SPINLOCK_H
-
-/*
- * Copyright (C) 1998-2003 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
- *
- * This file is used for SMP configurations only.
- */
-
-#include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/bitops.h>
-
-#include <linux/atomic.h>
-#include <asm/intrinsics.h>
-#include <asm/barrier.h>
-#include <asm/processor.h>
-
-#define arch_spin_lock_init(x) ((x)->lock = 0)
-
-/*
- * Ticket locks are conceptually two parts, one indicating the current head of
- * the queue, and the other indicating the current tail. The lock is acquired
- * by atomically noting the tail and incrementing it by one (thus adding
- * ourself to the queue and noting our position), then waiting until the head
- * becomes equal to the the initial value of the tail.
- * The pad bits in the middle are used to prevent the next_ticket number
- * overflowing into the now_serving number.
- *
- * 31 17 16 15 14 0
- * +----------------------------------------------------+
- * | now_serving | padding | next_ticket |
- * +----------------------------------------------------+
- */
-
-#define TICKET_SHIFT 17
-#define TICKET_BITS 15
-#define TICKET_MASK ((1 << TICKET_BITS) - 1)
-
-static __always_inline void __ticket_spin_lock(arch_spinlock_t *lock)
-{
- int *p = (int *)&lock->lock, ticket, serve;
-
- ticket = ia64_fetchadd(1, p, acq);
-
- if (!(((ticket >> TICKET_SHIFT) ^ ticket) & TICKET_MASK))
- return;
-
- ia64_invala();
-
- for (;;) {
- asm volatile ("ld4.c.nc %0=[%1]" : "=r"(serve) : "r"(p) : "memory");
-
- if (!(((serve >> TICKET_SHIFT) ^ ticket) & TICKET_MASK))
- return;
- cpu_relax();
- }
-}
-
-static __always_inline int __ticket_spin_trylock(arch_spinlock_t *lock)
-{
- int tmp = READ_ONCE(lock->lock);
-
- if (!(((tmp >> TICKET_SHIFT) ^ tmp) & TICKET_MASK))
- return ia64_cmpxchg(acq, &lock->lock, tmp, tmp + 1, sizeof (tmp)) == tmp;
- return 0;
-}
-
-static __always_inline void __ticket_spin_unlock(arch_spinlock_t *lock)
-{
- unsigned short *p = (unsigned short *)&lock->lock + 1, tmp;
-
- /* This could be optimised with ARCH_HAS_MMIOWB */
- mmiowb();
- asm volatile ("ld2.bias %0=[%1]" : "=r"(tmp) : "r"(p));
- WRITE_ONCE(*p, (tmp + 2) & ~1);
-}
-
-static inline int __ticket_spin_is_locked(arch_spinlock_t *lock)
-{
- long tmp = READ_ONCE(lock->lock);
-
- return !!(((tmp >> TICKET_SHIFT) ^ tmp) & TICKET_MASK);
-}
-
-static inline int __ticket_spin_is_contended(arch_spinlock_t *lock)
-{
- long tmp = READ_ONCE(lock->lock);
-
- return ((tmp - (tmp >> TICKET_SHIFT)) & TICKET_MASK) > 1;
-}
-
-static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock)
-{
- return !(((lock.lock >> TICKET_SHIFT) ^ lock.lock) & TICKET_MASK);
-}
-
-static inline int arch_spin_is_locked(arch_spinlock_t *lock)
-{
- return __ticket_spin_is_locked(lock);
-}
-
-static inline int arch_spin_is_contended(arch_spinlock_t *lock)
-{
- return __ticket_spin_is_contended(lock);
-}
-#define arch_spin_is_contended arch_spin_is_contended
-
-static __always_inline void arch_spin_lock(arch_spinlock_t *lock)
-{
- __ticket_spin_lock(lock);
-}
-
-static __always_inline int arch_spin_trylock(arch_spinlock_t *lock)
-{
- return __ticket_spin_trylock(lock);
-}
-
-static __always_inline void arch_spin_unlock(arch_spinlock_t *lock)
-{
- __ticket_spin_unlock(lock);
-}
-
-static __always_inline void arch_spin_lock_flags(arch_spinlock_t *lock,
- unsigned long flags)
-{
- arch_spin_lock(lock);
-}
-#define arch_spin_lock_flags arch_spin_lock_flags
-
-#ifdef ASM_SUPPORTED
-
-static __always_inline void
-arch_read_lock_flags(arch_rwlock_t *lock, unsigned long flags)
-{
- __asm__ __volatile__ (
- "tbit.nz p6, p0 = %1,%2\n"
- "br.few 3f\n"
- "1:\n"
- "fetchadd4.rel r2 = [%0], -1;;\n"
- "(p6) ssm psr.i\n"
- "2:\n"
- "hint @pause\n"
- "ld4 r2 = [%0];;\n"
- "cmp4.lt p7,p0 = r2, r0\n"
- "(p7) br.cond.spnt.few 2b\n"
- "(p6) rsm psr.i\n"
- ";;\n"
- "3:\n"
- "fetchadd4.acq r2 = [%0], 1;;\n"
- "cmp4.lt p7,p0 = r2, r0\n"
- "(p7) br.cond.spnt.few 1b\n"
- : : "r"(lock), "r"(flags), "i"(IA64_PSR_I_BIT)
- : "p6", "p7", "r2", "memory");
-}
-
-#define arch_read_lock_flags arch_read_lock_flags
-#define arch_read_lock(lock) arch_read_lock_flags(lock, 0)
-
-#else /* !ASM_SUPPORTED */
-
-#define arch_read_lock_flags(rw, flags) arch_read_lock(rw)
-
-#define arch_read_lock(rw) \
-do { \
- arch_rwlock_t *__read_lock_ptr = (rw); \
- \
- while (unlikely(ia64_fetchadd(1, (int *) __read_lock_ptr, acq) < 0)) { \
- ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \
- while (*(volatile int *)__read_lock_ptr < 0) \
- cpu_relax(); \
- } \
-} while (0)
-
-#endif /* !ASM_SUPPORTED */
-
-#define arch_read_unlock(rw) \
-do { \
- arch_rwlock_t *__read_lock_ptr = (rw); \
- ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \
-} while (0)
-
-#ifdef ASM_SUPPORTED
-
-static __always_inline void
-arch_write_lock_flags(arch_rwlock_t *lock, unsigned long flags)
-{
- __asm__ __volatile__ (
- "tbit.nz p6, p0 = %1, %2\n"
- "mov ar.ccv = r0\n"
- "dep r29 = -1, r0, 31, 1\n"
- "br.few 3f;;\n"
- "1:\n"
- "(p6) ssm psr.i\n"
- "2:\n"
- "hint @pause\n"
- "ld4 r2 = [%0];;\n"
- "cmp4.eq p0,p7 = r0, r2\n"
- "(p7) br.cond.spnt.few 2b\n"
- "(p6) rsm psr.i\n"
- ";;\n"
- "3:\n"
- "cmpxchg4.acq r2 = [%0], r29, ar.ccv;;\n"
- "cmp4.eq p0,p7 = r0, r2\n"
- "(p7) br.cond.spnt.few 1b;;\n"
- : : "r"(lock), "r"(flags), "i"(IA64_PSR_I_BIT)
- : "ar.ccv", "p6", "p7", "r2", "r29", "memory");
-}
-
-#define arch_write_lock_flags arch_write_lock_flags
-#define arch_write_lock(rw) arch_write_lock_flags(rw, 0)
-
-#define arch_write_trylock(rw) \
-({ \
- register long result; \
- \
- __asm__ __volatile__ ( \
- "mov ar.ccv = r0\n" \
- "dep r29 = -1, r0, 31, 1;;\n" \
- "cmpxchg4.acq %0 = [%1], r29, ar.ccv\n" \
- : "=r"(result) : "r"(rw) : "ar.ccv", "r29", "memory"); \
- (result == 0); \
-})
-
-static inline void arch_write_unlock(arch_rwlock_t *x)
-{
- u8 *y = (u8 *)x;
- barrier();
- asm volatile ("st1.rel.nta [%0] = r0\n\t" :: "r"(y+3) : "memory" );
-}
-
-#else /* !ASM_SUPPORTED */
-
-#define arch_write_lock(l) \
-({ \
- __u64 ia64_val, ia64_set_val = ia64_dep_mi(-1, 0, 31, 1); \
- __u32 *ia64_write_lock_ptr = (__u32 *) (l); \
- do { \
- while (*ia64_write_lock_ptr) \
- ia64_barrier(); \
- ia64_val = ia64_cmpxchg4_acq(ia64_write_lock_ptr, ia64_set_val, 0); \
- } while (ia64_val); \
-})
-
-#define arch_write_trylock(rw) \
-({ \
- __u64 ia64_val; \
- __u64 ia64_set_val = ia64_dep_mi(-1, 0, 31,1); \
- ia64_val = ia64_cmpxchg4_acq((__u32 *)(rw), ia64_set_val, 0); \
- (ia64_val == 0); \
-})
-
-static inline void arch_write_unlock(arch_rwlock_t *x)
-{
- barrier();
- x->write_lock = 0;
-}
-
-#endif /* !ASM_SUPPORTED */
-
-static inline int arch_read_trylock(arch_rwlock_t *x)
-{
- union {
- arch_rwlock_t lock;
- __u32 word;
- } old, new;
- old.lock = new.lock = *x;
- old.lock.write_lock = new.lock.write_lock = 0;
- ++new.lock.read_counter;
- return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word;
-}
-
-#endif /* _ASM_IA64_SPINLOCK_H */
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