5d06c0e812
clients to use a hardware-assisted data mover to clear a region of memory, fill a region of memory with a specific value, copy a region of memory, and perform simple boolean operations such as XOR on multiple regions of memory. Included here is a software back-end which can serve as an example of how to write a back-end (and also provides a fall-back in case hardware for a given function is not available), as well as a dmoverio(4) pseudo- device which provides access to dmover(9) to userland via a message passing interface. dmover(9) is still a work-in-progress -- a few minor changes to the interface are expected.
146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
/* $NetBSD: dmover_request.c,v 1.1 2002/08/02 00:30:39 thorpej Exp $ */
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/*
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* Copyright (c) 2002 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* dmover_request.c: Request management functions for dmover-api.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dmover_request.c,v 1.1 2002/08/02 00:30:39 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/pool.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <dev/dmover/dmovervar.h>
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struct pool dmover_request_pool;
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struct pool_cache dmover_request_cache;
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static int initialized;
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static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER;
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void
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dmover_request_initialize(void)
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{
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int s;
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s = splbio();
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simple_lock(&initialized_slock);
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if (__predict_true(initialized == 0)) {
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pool_init(&dmover_request_pool, sizeof(struct dmover_request),
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0, 0, 0, "dmreq", NULL);
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pool_cache_init(&dmover_request_cache, &dmover_request_pool,
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NULL, NULL, NULL);
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initialized = 1;
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}
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simple_unlock(&initialized_slock);
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splx(s);
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}
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/*
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* dmover_request_alloc: [client interface function]
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*
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* Allocate a tranform request for the specified session.
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*/
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struct dmover_request *
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dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
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{
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struct dmover_request *dreq;
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int s, inputs = dses->dses_ninputs;
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if (__predict_false(initialized == 0)) {
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int error;
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s = splbio();
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simple_lock(&initialized_slock);
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error = (initialized == 0);
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simple_unlock(&initialized_slock);
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splx(s);
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if (error)
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return (NULL);
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}
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s = splbio();
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dreq = pool_cache_get(&dmover_request_cache, PR_NOWAIT);
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splx(s);
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if (dreq == NULL)
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return (NULL);
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memset(dreq, 0, sizeof(*dreq));
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if (inputs != 0) {
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if (inbuf == NULL) {
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inbuf = malloc(sizeof(dmover_buffer) * inputs,
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M_DEVBUF, M_NOWAIT);
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if (inbuf == NULL) {
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s = splbio();
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pool_cache_put(&dmover_request_cache, dreq);
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splx(s);
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return (NULL);
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}
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}
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dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE;
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dreq->dreq_inbuf = inbuf;
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}
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dreq->dreq_session = dses;
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return (dreq);
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}
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/*
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* dmover_request_free: [client interface function]
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*
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* Free a dmover request.
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*/
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void
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dmover_request_free(struct dmover_request *dreq)
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{
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int s;
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if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
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free(dreq->dreq_inbuf, M_DEVBUF);
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s = splbio();
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pool_cache_put(&dmover_request_cache, dreq);
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splx(s);
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}
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