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// SPDX-FileCopyrightText: 2010 Paolo Bonzini <pbonzini@redhat.com>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#ifndef _URCU_ARCH_GENERIC_H
#define _URCU_ARCH_GENERIC_H
/*
* arch_generic.h: common definitions for multiple architectures.
*/
#include <urcu/compiler.h>
#include <urcu/config.h>
#include <urcu/syscall-compat.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef CAA_CACHE_LINE_SIZE
#define CAA_CACHE_LINE_SIZE 64
#endif
#if !defined(cmm_mc) && !defined(cmm_rmc) && !defined(cmm_wmc)
#define CONFIG_HAVE_MEM_COHERENCY
/*
* Architectures with cache coherency must _not_ define cmm_mc/cmm_rmc/cmm_wmc.
*
* For them, cmm_mc/cmm_rmc/cmm_wmc are implemented with a simple
* compiler barrier; in addition, we provide defaults for cmm_mb (using
* GCC builtins) as well as cmm_rmb and cmm_wmb (defaulting to cmm_mb).
*/
#ifdef CONFIG_RCU_USE_ATOMIC_BUILTINS
# ifdef CMM_SANITIZE_THREAD
/*
* This makes TSAN quiet about unsupported thread fence.
*/
static inline void _cmm_thread_fence_wrapper(void)
{
# if defined(__clang__)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wpragmas"
# pragma clang diagnostic ignored "-Wunknown-warning-option"
# pragma clang diagnostic ignored "-Wtsan"
# elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wpragmas"
# pragma GCC diagnostic ignored "-Wtsan"
# endif
__atomic_thread_fence(__ATOMIC_SEQ_CST);
# if defined(__clang__)
# pragma clang diagnostic pop
# elif defined(__GNUC__)
# pragma GCC diagnostic pop
# endif
}
# endif /* CMM_SANITIZE_THREAD */
# ifndef cmm_smp_mb
# ifdef CMM_SANITIZE_THREAD
# define cmm_smp_mb() _cmm_thread_fence_wrapper()
# else
# define cmm_smp_mb() __atomic_thread_fence(__ATOMIC_SEQ_CST)
# endif /* CMM_SANITIZE_THREAD */
# endif /* !cmm_smp_mb */
#endif /* CONFIG_RCU_USE_ATOMIC_BUILTINS */
/*
* cmm_mb() expands to __sync_synchronize() instead of __atomic_thread_fence
* with SEQ_CST because the former "issues a full memory barrier" while the
* latter "acts as a synchronization fence between threads" which is too weak
* for what we want, for example with I/O devices.
*
* Even though sync_synchronize seems to be an alias for a sequential consistent
* atomic thread fence on every architecture on GCC and Clang, this assumption
* might be untrue in future. Therefore, the definitions above are used to
* ensure correct behavior in the future.
*
* The above defintions are quoted from the GCC manual.
*/
#ifndef cmm_mb
#define cmm_mb() __sync_synchronize()
#endif
#ifndef cmm_rmb
#define cmm_rmb() cmm_mb()
#endif
#ifndef cmm_wmb
#define cmm_wmb() cmm_mb()
#endif
#define cmm_mc() cmm_barrier()
#define cmm_rmc() cmm_barrier()
#define cmm_wmc() cmm_barrier()
#else
/*
* Architectures without cache coherency need something like the following:
*
* #define cmm_mc() arch_cache_flush()
* #define cmm_rmc() arch_cache_flush_read()
* #define cmm_wmc() arch_cache_flush_write()
*
* Of these, only cmm_mc is mandatory. cmm_rmc and cmm_wmc default to
* cmm_mc. cmm_mb/cmm_rmb/cmm_wmb use these definitions by default:
*
* #define cmm_mb() cmm_mc()
* #define cmm_rmb() cmm_rmc()
* #define cmm_wmb() cmm_wmc()
*/
#ifndef cmm_mb
#define cmm_mb() cmm_mc()
#endif
#ifndef cmm_rmb
#define cmm_rmb() cmm_rmc()
#endif
#ifndef cmm_wmb
#define cmm_wmb() cmm_wmc()
#endif
#ifndef cmm_rmc
#define cmm_rmc() cmm_mc()
#endif
#ifndef cmm_wmc
#define cmm_wmc() cmm_mc()
#endif
#endif
/* Nop everywhere except on alpha. */
#ifndef cmm_read_barrier_depends
#define cmm_read_barrier_depends()
#endif
#ifdef CONFIG_RCU_SMP
#ifndef cmm_smp_mb
#define cmm_smp_mb() cmm_mb()
#endif
#ifndef cmm_smp_rmb
#define cmm_smp_rmb() cmm_rmb()
#endif
#ifndef cmm_smp_wmb
#define cmm_smp_wmb() cmm_wmb()
#endif
#ifndef cmm_smp_mc
#define cmm_smp_mc() cmm_mc()
#endif
#ifndef cmm_smp_rmc
#define cmm_smp_rmc() cmm_rmc()
#endif
#ifndef cmm_smp_wmc
#define cmm_smp_wmc() cmm_wmc()
#endif
#ifndef cmm_smp_read_barrier_depends
#define cmm_smp_read_barrier_depends() cmm_read_barrier_depends()
#endif
#else
#ifndef cmm_smp_mb
#define cmm_smp_mb() cmm_barrier()
#endif
#ifndef cmm_smp_rmb
#define cmm_smp_rmb() cmm_barrier()
#endif
#ifndef cmm_smp_wmb
#define cmm_smp_wmb() cmm_barrier()
#endif
#ifndef cmm_smp_mc
#define cmm_smp_mc() cmm_barrier()
#endif
#ifndef cmm_smp_rmc
#define cmm_smp_rmc() cmm_barrier()
#endif
#ifndef cmm_smp_wmc
#define cmm_smp_wmc() cmm_barrier()
#endif
#ifndef cmm_smp_read_barrier_depends
#define cmm_smp_read_barrier_depends()
#endif
#endif
#ifndef caa_cpu_relax
#define caa_cpu_relax() cmm_barrier()
#endif
#ifndef HAS_CAA_GET_CYCLES
#define HAS_CAA_GET_CYCLES
#if defined(__APPLE__)
#include <mach/mach.h>
#include <mach/clock.h>
#include <mach/mach_time.h>
#include <time.h>
#include <stdint.h>
typedef uint64_t caa_cycles_t;
static inline caa_cycles_t caa_get_cycles (void)
{
mach_timespec_t ts = { 0, 0 };
static clock_serv_t clock_service;
if (caa_unlikely(!clock_service)) {
if (host_get_clock_service(mach_host_self(),
SYSTEM_CLOCK, &clock_service))
return -1ULL;
}
if (caa_unlikely(clock_get_time(clock_service, &ts)))
return -1ULL;
return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
}
#elif defined(CONFIG_RCU_HAVE_CLOCK_GETTIME)
#include <time.h>
#include <stdint.h>
typedef uint64_t caa_cycles_t;
static inline caa_cycles_t caa_get_cycles (void)
{
struct timespec ts;
if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC, &ts)))
return -1ULL;
return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec;
}
#else
#error caa_get_cycles() not implemented for this platform.
#endif
#endif /* HAS_CAA_GET_CYCLES */
#ifdef __cplusplus
}
#endif
#endif /* _URCU_ARCH_GENERIC_H */
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