1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
/*
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* Disk Array driver for Compaq SA53xx Controllers, SCSI Tape module
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* Copyright 2001 Compaq Computer Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Questions/Comments/Bugfixes to iss_storagedev@hp.com
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*
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*/
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#ifdef CONFIG_CISS_SCSI_TAPE
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#ifndef _CCISS_SCSI_H_
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#define _CCISS_SCSI_H_
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#include <scsi/scsicam.h> /* possibly irrelevant, since we don't show disks */
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// the scsi id of the adapter...
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#define SELF_SCSI_ID 15
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// 15 is somewhat arbitrary, since the scsi-2 bus
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// that's presented by the driver to the OS is
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// fabricated. The "real" scsi-3 bus the
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// hardware presents is fabricated too.
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// The actual, honest-to-goodness physical
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// bus that the devices are attached to is not
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// addressible natively, and may in fact turn
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// out to be not scsi at all.
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#define SCSI_CCISS_CAN_QUEUE 2
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/*
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Note, cmd_per_lun could give us some trouble, so I'm setting it very low.
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Likewise, SCSI_CCISS_CAN_QUEUE is set very conservatively.
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If the upper scsi layer tries to track how many commands we have
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outstanding, it will be operating under the misapprehension that it is
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the only one sending us requests. We also have the block interface,
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which is where most requests must surely come from, so the upper layer's
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notion of how many requests we have outstanding will be wrong most or
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all of the time.
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Note, the normal SCSI mid-layer error handling doesn't work well
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for this driver because 1) it takes the io_request_lock before
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calling error handlers and uses a local variable to store flags,
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so the io_request_lock cannot be released and interrupts enabled
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inside the error handlers, and, the error handlers cannot poll
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for command completion because they might get commands from the
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block half of the driver completing, and not know what to do
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with them. That's what we get for making a hybrid scsi/block
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driver, I suppose.
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*/
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struct cciss_scsi_dev_t {
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int devtype;
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int bus, target, lun; /* as presented to the OS */
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unsigned char scsi3addr[8]; /* as presented to the HW */
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};
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struct cciss_scsi_hba_t {
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char *name;
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int ndevices;
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#define CCISS_MAX_SCSI_DEVS_PER_HBA 16
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struct cciss_scsi_dev_t dev[CCISS_MAX_SCSI_DEVS_PER_HBA];
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};
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#endif /* _CCISS_SCSI_H_ */
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#endif /* CONFIG_CISS_SCSI_TAPE */
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