xref: /rockchip-linux_mpp/osal/mpp_lock.c (revision 437bfbeb9567cca9cd9080e3f6954aa9d6a94f18)

/* SPDX-License-Identifier: Apache-2.0 OR MIT */
/*
 * Copyright (c) 2021 Rockchip Electronics Co., Ltd.
 */

#define MODULE_TAG "mpp_lock"

#include "mpp_env.h"
#include "mpp_log.h"
#include "mpp_lock.h"
#include "mpp_time.h"

#define LOCK_IDLE   0
#define LOCK_BUSY   1

void mpp_spinlock_init(spinlock_t *lock)
{
    MPP_SYNC_CLR(&lock->lock);
    lock->count = 0;
    lock->time = 0;

    mpp_env_get_u32("mpp_lock_debug", &lock->debug, 0);
}

void mpp_spinlock_lock(spinlock_t *lock)
{
    RK_S64 time = 0;

    if (lock->debug)
        time = mpp_time();

    while (!MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY)) {
        asm("NOP");
        asm("NOP");
    }

    if (lock->debug && time) {
        lock->time += mpp_time() - time;
        lock->count++;
    }
}

void mpp_spinlock_deinit(spinlock_t *lock, const char *name)
{
    if (lock->debug && lock->count) {
        mpp_log("lock %s lock %lld times take time %lld avg %d", name,
                lock->count, lock->time, (RK_S32)(lock->time / lock->count));
    }
}

void mpp_spinlock_unlock(spinlock_t *lock)
{
    MPP_SYNC_CLR(&lock->lock);
}

bool mpp_spinlock_trylock(spinlock_t *lock)
{
    RK_S64 time = 0;
    bool ret;

    if (lock->debug)
        time = mpp_time();

    ret = MPP_BOOL_CAS(&lock->lock, LOCK_IDLE, LOCK_BUSY);

    if (ret && lock->debug && time) {
        lock->time += mpp_time() - time;
        lock->count++;
    }

    return ret;
}