/*      $NetBSD: dmover_request.c,v 1.8 2011/05/14 18:24:47 jakllsch Exp $      */

/*
* Copyright (c) 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed for the NetBSD Project by
*      Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
*    or promote products derived from this software without specific prior
*    written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/

/*
* dmover_request.c: Request management functions for dmover-api.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: dmover_request.c,v 1.8 2011/05/14 18:24:47 jakllsch Exp $");

#include <sys/param.h>
#include <sys/pool.h>
#include <sys/systm.h>
#include <sys/malloc.h>

#include <dev/dmover/dmovervar.h>

pool_cache_t dmover_request_cache;

static bool initialized;

void
dmover_request_initialize(void)
{

       KASSERT(initialized == false);

       dmover_request_cache = pool_cache_init(sizeof(struct dmover_request),
               0, 0, 0, "dmreq", NULL, IPL_BIO, NULL, NULL, NULL);

       initialized = true;
}

/*
* dmover_request_alloc:        [client interface function]
*
*      Allocate a transform request for the specified session.
*/
struct dmover_request *
dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
{
       struct dmover_request *dreq;
       int inputs = dses->dses_ninputs;

       if (__predict_false(initialized == false))
               return (NULL);

       dreq = pool_cache_get(dmover_request_cache, PR_NOWAIT);
       if (dreq == NULL)
               return (NULL);

       memset(dreq, 0, sizeof(*dreq));

       if (inputs != 0) {
               if (inbuf == NULL) {
                       inbuf = malloc(sizeof(dmover_buffer) * inputs,
                           M_DEVBUF, M_NOWAIT);
                       if (inbuf == NULL) {
                               pool_cache_put(dmover_request_cache, dreq);
                               return (NULL);
                       }
               }
               dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE;
               dreq->dreq_inbuf = inbuf;
       }

       dreq->dreq_session = dses;

       return (dreq);
}

/*
* dmover_request_free:         [client interface function]
*
*      Free a dmover request.
*/
void
dmover_request_free(struct dmover_request *dreq)
{

       KASSERT(initialized == true);

       if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
               free(dreq->dreq_inbuf, M_DEVBUF);

       pool_cache_put(dmover_request_cache, dreq);
}