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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/block/cciss_scsi.h
Initial import
Diffstat (limited to 'drivers/block/cciss_scsi.h')
-rw-r--r--drivers/block/cciss_scsi.h79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/block/cciss_scsi.h b/drivers/block/cciss_scsi.h
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+++ b/drivers/block/cciss_scsi.h
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+/*
+ * Disk Array driver for HP Smart Array controllers, SCSI Tape module.
+ * (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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. 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., 59 Temple Place, Suite 300, Boston, MA
+ * 02111-1307, 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. */
+
+
+/*
+
+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 */
+ unsigned char device_id[16]; /* from inquiry pg. 0x83 */
+ unsigned char vendor[8]; /* bytes 8-15 of inquiry data */
+ unsigned char model[16]; /* bytes 16-31 of inquiry data */
+ unsigned char revision[4]; /* bytes 32-35 of inquiry data */
+};
+
+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 */