937a7a3ed9
This is a completely rewritten scsipi_xfer execution engine, and the associated changes to HBA drivers. Overview of changes & features: - All xfers are queued in the mid-layer, rather than doing so in an ad-hoc fashion in individual adapter drivers. - Adapter/channel resource management in the mid-layer, avoids even trying to start running an xfer if the adapter/channel doesn't have the resources. - Better communication between the mid-layer and the adapters. - Asynchronous event notification mechanism from adapter to mid-layer and peripherals. - Better peripheral queue management: freeze/thaw, sorted requeueing during recovery, etc. - Clean separation of peripherals, adapters, and adapter channels (no more scsipi_link). - Kernel thread for each scsipi_channel makes error recovery much easier (no more dealing with interrupt context when recovering from an error). - Mid-layer support for tagged queueing: commands can have the tag type set explicitly, tag IDs are allocated in the mid-layer (thus eliminating the need to use buggy tag ID allocation schemes in many adapter drivers). - support for QUEUE FULL and CHECK CONDITION status in mid-layer; the command will be requeued, or a REQUEST SENSE will be sent as appropriate. Just before the merge syssrc has been tagged with thorpej_scsipi_beforemerge
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/* $NetBSD: scsipi_base.h,v 1.11 2001/04/25 17:53:40 bouyer Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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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 by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS
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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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struct scsipi_xfer *scsipi_get_xs __P((struct scsipi_periph *, int));
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void scsipi_put_xs __P((struct scsipi_xfer *));
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static __inline struct scsipi_xfer *scsipi_make_xs __P((struct scsipi_periph *,
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struct scsipi_generic *, int cmdlen, u_char *data_addr,
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int datalen, int retries, int timeout, struct buf *,
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int flags)) __attribute__ ((__unused__));
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/*
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* Make a scsipi_xfer, and return a pointer to it.
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*/
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static __inline struct scsipi_xfer *
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scsipi_make_xs(periph, scsipi_cmd, cmdlen, data_addr, datalen,
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retries, timeout, bp, flags)
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struct scsipi_periph *periph;
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struct scsipi_generic *scsipi_cmd;
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int cmdlen;
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u_char *data_addr;
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int datalen;
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int retries;
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int timeout;
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struct buf *bp;
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int flags;
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{
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struct scsipi_xfer *xs;
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if ((xs = scsipi_get_xs(periph, flags)) == NULL)
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return (NULL);
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/*
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* Fill out the scsipi_xfer structure. We don't know whose context
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* the cmd is in, so copy it.
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*/
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bcopy(scsipi_cmd, &xs->cmdstore, cmdlen);
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xs->cmd = &xs->cmdstore;
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xs->cmdlen = cmdlen;
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xs->data = data_addr;
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xs->datalen = datalen;
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xs->xs_retries = retries;
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xs->timeout = timeout;
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xs->bp = bp;
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return (xs);
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}
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