mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
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!
80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/*
|
|
* Disk Array driver for Compaq SA53xx Controllers, SCSI Tape module
|
|
* Copyright 2001 Compaq Computer Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Questions/Comments/Bugfixes to iss_storagedev@hp.com
|
|
*
|
|
*/
|
|
#ifdef CONFIG_CISS_SCSI_TAPE
|
|
#ifndef _CCISS_SCSI_H_
|
|
#define _CCISS_SCSI_H_
|
|
|
|
#include <scsi/scsicam.h> /* possibly irrelevant, since we don't show disks */
|
|
|
|
// the scsi id of the adapter...
|
|
#define SELF_SCSI_ID 15
|
|
// 15 is somewhat arbitrary, since the scsi-2 bus
|
|
// that's presented by the driver to the OS is
|
|
// fabricated. The "real" scsi-3 bus the
|
|
// hardware presents is fabricated too.
|
|
// The actual, honest-to-goodness physical
|
|
// bus that the devices are attached to is not
|
|
// addressible natively, and may in fact turn
|
|
// out to be not scsi at all.
|
|
|
|
#define SCSI_CCISS_CAN_QUEUE 2
|
|
|
|
/*
|
|
|
|
Note, cmd_per_lun could give us some trouble, so I'm setting it very low.
|
|
Likewise, SCSI_CCISS_CAN_QUEUE is set very conservatively.
|
|
|
|
If the upper scsi layer tries to track how many commands we have
|
|
outstanding, it will be operating under the misapprehension that it is
|
|
the only one sending us requests. We also have the block interface,
|
|
which is where most requests must surely come from, so the upper layer's
|
|
notion of how many requests we have outstanding will be wrong most or
|
|
all of the time.
|
|
|
|
Note, the normal SCSI mid-layer error handling doesn't work well
|
|
for this driver because 1) it takes the io_request_lock before
|
|
calling error handlers and uses a local variable to store flags,
|
|
so the io_request_lock cannot be released and interrupts enabled
|
|
inside the error handlers, and, the error handlers cannot poll
|
|
for command completion because they might get commands from the
|
|
block half of the driver completing, and not know what to do
|
|
with them. That's what we get for making a hybrid scsi/block
|
|
driver, I suppose.
|
|
|
|
*/
|
|
|
|
struct cciss_scsi_dev_t {
|
|
int devtype;
|
|
int bus, target, lun; /* as presented to the OS */
|
|
unsigned char scsi3addr[8]; /* as presented to the HW */
|
|
};
|
|
|
|
struct cciss_scsi_hba_t {
|
|
char *name;
|
|
int ndevices;
|
|
#define CCISS_MAX_SCSI_DEVS_PER_HBA 16
|
|
struct cciss_scsi_dev_t dev[CCISS_MAX_SCSI_DEVS_PER_HBA];
|
|
};
|
|
|
|
#endif /* _CCISS_SCSI_H_ */
|
|
#endif /* CONFIG_CISS_SCSI_TAPE */
|