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.
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* $NetBSD: dmover_session.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_session.c: Session 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_session.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_session_pool;
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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_session_initialize(void)
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{
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simple_lock(&initialized_slock);
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if (__predict_true(initialized == 0)) {
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pool_init(&dmover_session_pool, sizeof(struct dmover_session),
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0, 0, 0, "dmses", &pool_allocator_nointr);
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initialized = 1;
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}
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simple_unlock(&initialized_slock);
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}
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/*
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* dmover_session_create: [client interface function]
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*
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* Create a dmover session.
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*/
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int
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dmover_session_create(const char *type, struct dmover_session **dsesp)
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{
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struct dmover_session *dses;
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int error;
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if (__predict_false(initialized == 0)) {
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simple_lock(&initialized_slock);
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error = initialized ? 0 : ENXIO;
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simple_unlock(&initialized_slock);
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if (error)
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return (error);
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}
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dses = pool_get(&dmover_session_pool, PR_NOWAIT);
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if (__predict_false(dses == NULL))
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return (ENOMEM);
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/* Allocate a back-end to the session. */
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error = dmover_backend_alloc(dses, type);
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if (__predict_false(error)) {
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pool_put(&dmover_session_pool, dses);
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return (error);
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}
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TAILQ_INIT(&dses->__dses_pendreqs);
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dses->__dses_npendreqs = 0;
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*dsesp = dses;
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return (0);
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}
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/*
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* dmover_session_destroy: [client interface function]
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*
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* Tear down a dmover session.
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*/
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void
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dmover_session_destroy(struct dmover_session *dses)
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{
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#ifdef DIAGNOSTIC
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if (__predict_false(initialized == 0)) {
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int croak;
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simple_lock(&initialized_slock);
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croak = (initialized == 0);
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simple_unlock(&initialized_slock);
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if (croak)
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panic("dmover_session_destroy: not initialized");
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}
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#endif
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/* XXX */
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if (dses->__dses_npendreqs)
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panic("dmover_session_destroy");
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dmover_backend_release(dses);
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pool_put(&dmover_session_pool, dses);
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}
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