FreeBSD/Linux Kernel Cross Reference
sys/dev/mana/gdma_util.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * Copyright (c) 2021 Microsoft Corp.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     *
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/types.h>
    #include <sys/mutex.h>
    #include <sys/systm.h>
    
    #include "gdma_util.h"
    
    
    void
    init_completion(struct completion *c)
    {
            memset(c, 0, sizeof(*c));
            mtx_init(&c->lock, "gdma_completion", NULL, MTX_DEF);
            c->done = 0;
    }
    
    void
    free_completion(struct completion *c)
    {
            mtx_destroy(&c->lock);
    }
    
    void
    complete(struct completion *c)
    {
            mtx_lock(&c->lock);
            c->done++;
            mtx_unlock(&c->lock);
            wakeup(c);
    }
    
    void
    wait_for_completion(struct completion *c)
    {
            mtx_lock(&c->lock);
            while (c->done == 0)
                    mtx_sleep(c, &c->lock, 0, "gdma_wfc", 0);
            c->done--;
            mtx_unlock(&c->lock);
    }
    
    /*
     * Return: 0 if completed, a non-zero value if timed out.
     */
    int
    wait_for_completion_timeout(struct completion *c, int timeout)
    {
            int ret;
    
            mtx_lock(&c->lock);
    
            if (c->done == 0)
                    mtx_sleep(c, &c->lock, 0, "gdma_wfc", timeout);
    
            if (c->done > 0) {
                    c->done--;
                    ret = 0;
            } else {
                    ret = 1;
            }
    
            mtx_unlock(&c->lock);
    
            return (ret);
    }

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