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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#ifndef _RTE_SPINLOCK_X86_64_H_
#define _RTE_SPINLOCK_X86_64_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "generic/rte_spinlock.h"
#include "rte_rtm.h"
#include "rte_cpuflags.h"
#include "rte_branch_prediction.h"
#include "rte_common.h"
#include "rte_pause.h"
#define RTE_RTM_MAX_RETRIES (10)
#define RTE_XABORT_LOCK_BUSY (0xff)
#ifndef RTE_FORCE_INTRINSICS
static inline void
rte_spinlock_lock(rte_spinlock_t *sl)
{
int lock_val = 1;
asm volatile (
"1:\n"
"xchg %[locked], %[lv]\n"
"test %[lv], %[lv]\n"
"jz 3f\n"
"2:\n"
"pause\n"
"cmpl $0, %[locked]\n"
"jnz 2b\n"
"jmp 1b\n"
"3:\n"
: [locked] "=m" (sl->locked), [lv] "=q" (lock_val)
: "[lv]" (lock_val)
: "memory");
}
static inline void
rte_spinlock_unlock (rte_spinlock_t *sl)
{
int unlock_val = 0;
asm volatile (
"xchg %[locked], %[ulv]\n"
: [locked] "=m" (sl->locked), [ulv] "=q" (unlock_val)
: "[ulv]" (unlock_val)
: "memory");
}
static inline int
rte_spinlock_trylock (rte_spinlock_t *sl)
{
int lockval = 1;
asm volatile (
"xchg %[locked], %[lockval]"
: [locked] "=m" (sl->locked), [lockval] "=q" (lockval)
: "[lockval]" (lockval)
: "memory");
return lockval == 0;
}
#endif
extern uint8_t rte_rtm_supported;
static inline int rte_tm_supported(void)
{
return rte_rtm_supported;
}
static inline int
rte_try_tm(volatile int *lock)
{
int retries;
if (!rte_rtm_supported)
return 0;
retries = RTE_RTM_MAX_RETRIES;
while (likely(retries--)) {
unsigned int status = rte_xbegin();
if (likely(RTE_XBEGIN_STARTED == status)) {
if (unlikely(*lock))
rte_xabort(RTE_XABORT_LOCK_BUSY);
else
return 1;
}
while (*lock)
rte_pause();
if ((status & RTE_XABORT_EXPLICIT) &&
(RTE_XABORT_CODE(status) == RTE_XABORT_LOCK_BUSY))
continue;
if ((status & RTE_XABORT_RETRY) == 0) /* do not retry */
break;
}
return 0;
}
static inline void
rte_spinlock_lock_tm(rte_spinlock_t *sl)
{
if (likely(rte_try_tm(&sl->locked)))
return;
rte_spinlock_lock(sl); /* fall-back */
}
static inline int
rte_spinlock_trylock_tm(rte_spinlock_t *sl)
{
if (likely(rte_try_tm(&sl->locked)))
return 1;
return rte_spinlock_trylock(sl);
}
static inline void
rte_spinlock_unlock_tm(rte_spinlock_t *sl)
{
if (unlikely(sl->locked))
rte_spinlock_unlock(sl);
else
rte_xend();
}
static inline void
rte_spinlock_recursive_lock_tm(rte_spinlock_recursive_t *slr)
{
if (likely(rte_try_tm(&slr->sl.locked)))
return;
rte_spinlock_recursive_lock(slr); /* fall-back */
}
static inline void
rte_spinlock_recursive_unlock_tm(rte_spinlock_recursive_t *slr)
{
if (unlikely(slr->sl.locked))
rte_spinlock_recursive_unlock(slr);
else
rte_xend();
}
static inline int
rte_spinlock_recursive_trylock_tm(rte_spinlock_recursive_t *slr)
{
if (likely(rte_try_tm(&slr->sl.locked)))
return 1;
return rte_spinlock_recursive_trylock(slr);
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_SPINLOCK_X86_64_H_ */
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