NetBSD/sys/dev/dmover/dmover_request.c

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/* $NetBSD: dmover_request.c,v 1.1 2002/08/02 00:30:39 thorpej 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 1.1 2002/08/02 00:30:39 thorpej Exp $");
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/pool.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <dev/dmover/dmovervar.h>
struct pool dmover_request_pool;
struct pool_cache dmover_request_cache;
static int initialized;
static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER;
void
dmover_request_initialize(void)
{
int s;
s = splbio();
simple_lock(&initialized_slock);
if (__predict_true(initialized == 0)) {
pool_init(&dmover_request_pool, sizeof(struct dmover_request),
0, 0, 0, "dmreq", NULL);
pool_cache_init(&dmover_request_cache, &dmover_request_pool,
NULL, NULL, NULL);
initialized = 1;
}
simple_unlock(&initialized_slock);
splx(s);
}
/*
* dmover_request_alloc: [client interface function]
*
* Allocate a tranform request for the specified session.
*/
struct dmover_request *
dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
{
struct dmover_request *dreq;
int s, inputs = dses->dses_ninputs;
if (__predict_false(initialized == 0)) {
int error;
s = splbio();
simple_lock(&initialized_slock);
error = (initialized == 0);
simple_unlock(&initialized_slock);
splx(s);
if (error)
return (NULL);
}
s = splbio();
dreq = pool_cache_get(&dmover_request_cache, PR_NOWAIT);
splx(s);
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) {
s = splbio();
pool_cache_put(&dmover_request_cache, dreq);
splx(s);
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)
{
int s;
if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
free(dreq->dreq_inbuf, M_DEVBUF);
s = splbio();
pool_cache_put(&dmover_request_cache, dreq);
splx(s);
}