xref: /titanic_52/usr/src/cmd/format/ctlr_scsi.c (revision 1cb6af97c6f66f456d4f726ef056e1ebc0f73305)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * This file contains the routines for embedded scsi disks
 */
#include "global.h"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <errno.h>
#include <memory.h>
#include <malloc.h>
#include <unistd.h>
#include <stdlib.h>
#include <values.h>
#include <sys/byteorder.h>



#include "startup.h"
#include "scsi_com.h"
#include "misc.h"
#include "ctlr_scsi.h"
#include "analyze.h"
#include "param.h"
#include "io.h"


#ifndef	DAD_MODE_CACHE_CCS
#define	DAD_MODE_CACHE_CCS		0x38
#endif /* DAD_MODE_CACHE_CCS */

/* format defect header bits */
#define	FDH_FOV				0x80
#define	FDH_IMMED			0x02

#define	SENSE_LEN			20

#define	RETRY_DELAY			5

#define	PROGRESS_INDICATION_BASE	65536

#ifdef	__STDC__
/*
 *	Local prototypes for ANSI C compilers
 */
static int	scsi_format(uint64_t, uint64_t, struct defect_list *);
static int	scsi_raw_format(void);
static int	scsi_ms_page8(int);
static int	scsi_ms_page38(int);
static void	scsi_convert_list_to_new(struct defect_list *,
			struct scsi_defect_list *, int);
static char	*scsi_find_command_name(uint_t);
static int	chg_list_affects_page(struct chg_list *, int);
static void	scsi_printerr(struct uscsi_cmd *,
			struct scsi_extended_sense *, int);
static diskaddr_t
scsi_extract_sense_info_descr(struct scsi_descr_sense_hdr *sdsp, int rqlen);

static void	scsi_print_extended_sense(struct scsi_extended_sense *, int);
static void	scsi_print_descr_sense(struct scsi_descr_sense_hdr *, int);

static int	test_until_ready(int fd);
static int	uscsi_reserve_release(int, int);
static int	check_support_for_defects(void);
static int	scsi_format_without_defects(void);
static int	scsi_ms_page1(int);
static int	scsi_ms_page2(int);
static int	scsi_ms_page3(int);
static int	scsi_ms_page4(int);
static int	scsi_repair(uint64_t, int);
static int	scsi_read_defect_data(struct defect_list *, int);
static int	scsi_ck_format(void);

#ifdef i386
static int	scsi_rdwr(int, int, diskaddr_t, int, caddr_t, int, int *);
#endif /* i386 */

#else	/* __STDC__ */

static int	scsi_format();
static int	scsi_raw_format();
static int	scsi_ms_page8();
static int	scsi_ms_page38();
static void	scsi_convert_list_to_new();
static char	*scsi_find_command_name();
static int	chg_list_affects_page();
static void	scsi_printerr();
static diskaddr_t	scsi_extract_sense_info_descr();
static void	scsi_print_extended_sense();
static void	scsi_print_descr_sense();

static int	test_until_ready();

static int	uscsi_reserve_release();
static int	check_support_for_defects();
static int	scsi_format_without_defects();
static int	scsi_ms_page1();
static int	scsi_ms_page2();
static int	scsi_ms_page3();
static int	scsi_ms_page4();
static int	scsi_repair();
static int	scsi_read_defect_data();
static int	scsi_ck_format();

#ifdef i386
static int	scsi_rdwr(int, int, diskaddr_t, int, caddr_t, int, int *);
#endif /* i386 */

#endif	/* __STDC__ */



struct	ctlr_ops scsiops = {
	scsi_rdwr,
	scsi_ck_format,
	scsi_format,
	scsi_ex_man,
	scsi_ex_cur,
	scsi_repair,
	0,
};

#define	SCMD_UNKNOWN		0xff

/*
 * Names of commands.  Must have SCMD_UNKNOWN at end of list.
 */
static struct scsi_command_name {
	uchar_t command;
	char *name;
} scsi_command_names[] = {
	SCMD_FORMAT,		"format",
	SCMD_READ,		"read",
	SCMD_WRITE,		"write",
	SCMD_READ|SCMD_GROUP1,	"read",
	SCMD_WRITE|SCMD_GROUP1,	"write",
	SCMD_INQUIRY,		"inquiry",
	SCMD_MODE_SELECT,	"mode select",
	SCMD_MODE_SENSE,	"mode sense",
	SCMD_REASSIGN_BLOCK,	"reassign block",
	SCMD_READ_DEFECT_LIST,	"read defect list",
	SCMD_UNKNOWN,		"unknown"
};


/*
 * Strings for printing mode sense page control values
 */
static slist_t page_control_strings[] = {
	{ "current",	"",	MODE_SENSE_PC_CURRENT },
	{ "changeable",	"",	MODE_SENSE_PC_CHANGEABLE },
	{ "default",	"",	MODE_SENSE_PC_DEFAULT },
	{ "saved",	"",	MODE_SENSE_PC_SAVED }
};

/*
 * Strings for printing the mode select options
 */
static slist_t mode_select_strings[] = {
	{ "",		"",	0 },
	{ " (pf)",	"",	MODE_SELECT_PF },
	{ " (sp)",	"",	MODE_SELECT_SP },
	{ " (pf,sp)",	"",	MODE_SELECT_PF|MODE_SELECT_SP }
};

static int scsi_format_revolutions = 5;
static int scsi_format_timeout = 2*60*60;		/* two hours */

/*
 * READ DEFECT DATA commands is optional as per SCSI-2 spec.
 * Hence check if the read_defect_data command fails with
 * Invalid Opcode so that we can give a more meaningful message
 * to the user.
 */
#define	INVALID_OPCODE	0x20

/*
 * Read or write the disk.
 */
int
scsi_rdwr(dir, fd, blkno, secnt, bufaddr, flags, xfercntp)
	int	dir;
	int	fd;
	diskaddr_t	blkno;
	int	secnt;
	caddr_t bufaddr;
	int	flags;
	int	*xfercntp;
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	int	max_sectors;
	int	rc = 0;

	/*
	 * If the max xfercnt hasn't been determined start with BUF_SECTS
	 * (currently 126 == 63K), otherwise use the xfercnt value
	 * my caller saved from the previous invocation.
	 */
	if (xfercntp == NULL) {
		max_sectors = BUF_SECTS;
	} else if (*xfercntp == 0) {
		max_sectors = BUF_SECTS;
		*xfercntp = max_sectors;
	} else {
		max_sectors = *xfercntp;
	}

	/*
	 * Build and execute the uscsi ioctl.  We build a group0
	 * or group1 command as necessary, since some targets
	 * do not support group1 commands.
	 */
	while (secnt)  {
		int	nsectors;

		nsectors = (max_sectors < secnt) ? max_sectors : secnt;
		(void) memset((char *)&ucmd, 0, sizeof (ucmd));
		(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
		cdb.scc_cmd = (dir == DIR_READ) ? SCMD_READ : SCMD_WRITE;
		if (blkno < (2<<20) && nsectors <= 0xff) {
			FORMG0ADDR(&cdb, blkno);
			FORMG0COUNT(&cdb, nsectors);
			ucmd.uscsi_cdblen = CDB_GROUP0;
		} else {
			if (blkno > 0xffffffff) {
				FORMG4LONGADDR(&cdb, blkno);
				FORMG4COUNT(&cdb, nsectors);
				ucmd.uscsi_cdblen = CDB_GROUP4;
				cdb.scc_cmd |= SCMD_GROUP4;
			} else {
				FORMG1ADDR(&cdb, blkno);
				FORMG1COUNT(&cdb, nsectors);
				ucmd.uscsi_cdblen = CDB_GROUP1;
				cdb.scc_cmd |= SCMD_GROUP1;
			}
		}
		ucmd.uscsi_cdb = (caddr_t)&cdb;
		ucmd.uscsi_bufaddr = bufaddr;
		ucmd.uscsi_buflen = nsectors * SECSIZE;
		rc = uscsi_cmd(fd, &ucmd, flags);

		if (rc != 0)
			break;

		/*
		 * check if partial DMA breakup required
		 * if so, reduce the request size by half and retry
		 * the last request
		 */
		if (ucmd.uscsi_resid == ucmd.uscsi_buflen) {
			max_sectors >>= 1;
			if (max_sectors <= 0) {
				rc = -1;
				break;
			}
			continue;
		}
		if (ucmd.uscsi_resid != 0) {
			rc = -1;
			break;
		}

		blkno += nsectors;
		secnt -= nsectors;
		bufaddr += nsectors * SECSIZE;
	}

	/*
	 * If the xfercnt wasn't previously saved or if the
	 * new value is smaller than the old value, save the
	 * current value in my caller's save area.
	 */
	if (xfercntp != NULL && max_sectors < *xfercntp) {
		if (diag_msg)
			err_print("reducing xfercnt %d %d\n",
					*xfercntp, max_sectors);
		*xfercntp = max_sectors;
	}
	return (rc);
}


/*
 * Check to see if the disk has been formatted.
 * If we are able to read the first track, we conclude that
 * the disk has been formatted.
 */
#ifdef i386
static int
#else /* i386 */
static int
#endif /* i386 */
scsi_ck_format(void)
{
	int	status;

	/*
	 * Try to read the first four blocks.
	 */
	status = scsi_rdwr(DIR_READ, cur_file, 0, 4, (caddr_t)cur_buf,
		F_SILENT, NULL);
	return (!status);
}


/*
 * Format the disk, the whole disk, and nothing but the disk.
 */
/*ARGSUSED*/
static int
scsi_format(start, end, list)
	uint64_t		start;		/* irrelevant for us */
	uint64_t		end;
	struct defect_list	*list;
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	struct scsi_defect_hdr	defect_hdr;
	int			status;
	int			flag;
	struct scsi_inquiry	*inq;
	char			rawbuf[MAX_MODE_SENSE_SIZE];

	/*
	 * Determine if the target appears to be SCSI-2
	 * compliant.  We handle mode sense/mode selects
	 * a little differently, depending upon CCS/SCSI-2
	 */
	if (uscsi_inquiry(cur_file, rawbuf, sizeof (rawbuf))) {
		err_print("Inquiry failed\n");
		return (-1);
	}
	inq = (struct scsi_inquiry *)rawbuf;
	flag = (inq->inq_rdf == RDF_SCSI2);

	/*
	 * Reserve the scsi disk before performing mode select and
	 * format operations. This will keep other hosts, if any, from
	 * touching the disk while we are here.
	 */
	if (uscsi_reserve_release(cur_file, SCMD_RESERVE)) {
		err_print("Reserve failed\n");
		return (-1);
	}

	/*
	 * Set up the various SCSI parameters specified before
	 * formatting the disk.  Each routine handles the
	 * parameters relevent to a particular page.
	 * If no parameters are specified for a page, there's
	 * no need to do anything.  Otherwise, issue a mode
	 * sense for that page.  If a specified parameter
	 * differs from the drive's default value, and that
	 * parameter is not fixed, then issue a mode select to
	 * set the default value for the disk as specified
	 * in format.dat.
	 */
	if (scsi_ms_page1(flag) || scsi_ms_page2(flag) ||
		scsi_ms_page4(flag) || scsi_ms_page38(flag) ||
			scsi_ms_page8(flag) || scsi_ms_page3(flag)) {
		(void) uscsi_reserve_release(cur_file, SCMD_RELEASE);
		return (-1);
	}

	/*
	 * If we're debugging the drive, dump every page
	 * the device supports, for thorough analysis.
	 */
	if (option_msg && diag_msg) {
		(void) scsi_dump_mode_sense_pages(MODE_SENSE_PC_DEFAULT);
		(void) scsi_dump_mode_sense_pages(MODE_SENSE_PC_CURRENT);
		(void) scsi_dump_mode_sense_pages(MODE_SENSE_PC_SAVED);
		(void) scsi_dump_mode_sense_pages(MODE_SENSE_PC_CHANGEABLE);
		err_print("\n");
	}

	/*
	 * Construct the uscsi format ioctl.  The form depends
	 * upon the defect list the user extracted.  If s/he
	 * extracted the "original" list, we format with only
	 * the P (manufacturer's defect) list.  Otherwise, we
	 * format with both the P and the G (grown) list.
	 * To format with the P and G list, we set the fmtData
	 * bit, and send an empty list.  To format with the
	 * P list only, we also set the cmpLst bit, meaning
	 * that the (empty) list we send down is the complete
	 * G list, thereby discarding the old G list..
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	(void) memset((char *)&defect_hdr, 0, sizeof (defect_hdr));

	cdb.scc_cmd		= SCMD_FORMAT;
	ucmd.uscsi_cdb		= (caddr_t)&cdb;
	ucmd.uscsi_cdblen	= CDB_GROUP0;
	ucmd.uscsi_bufaddr	= (caddr_t)&defect_hdr;
	ucmd.uscsi_buflen	= sizeof (defect_hdr);
	cdb.cdb_opaque[1]	= FPB_DATA;
	defect_hdr.descriptor	= FDH_FOV | FDH_IMMED;

	if ((list->list != NULL) && ((list->flags & LIST_PGLIST) == 0)) {
		/*
		 * No G list.  The empty list we send down
		 * is the complete list.
		 */
		cdb.cdb_opaque[1] |= FPB_CMPLT;
	}

	/*
	 * Issue the format ioctl
	 */
	fmt_print("Formatting...\n");
	(void) fflush(stdout);
	status = uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	/* check if format with immed was successfully accepted */
	if (status == 0) {
		/* immed accepted pool to completion */
		status = test_until_ready(cur_file);
	} else {
		/* clear defect header and try basecase format */
		(void) memset((char *)&defect_hdr, 0, sizeof (defect_hdr));
		status = uscsi_cmd(cur_file, &ucmd,
			(option_msg && diag_msg) ? F_NORMAL : F_SILENT);
	}

	/* format failure check					*/
	if (status != 0) {
		/*
		 * formatting failed with fmtdata = 1.
		 * Check if defects list command is supported, if it
		 * is not supported then use fmtdata = 0.
		 * 	From SCSI Spec
		 *	    A FmtData bit of zero indicates, the
		 *	    source of defect information is not specified.
		 * else
		 *	proceed to format using with mode selects.
		 */
		if (!(check_support_for_defects())) {
			status = scsi_format_without_defects();
		}

		if (status != 0) {
			fmt_print("Format failed\n");
			status = scsi_raw_format();
		}
	}
	(void) uscsi_reserve_release(cur_file, SCMD_RELEASE);
	return (status);
}

/*
 * Format without any of the standard mode selects ignoring Grown defects list.
 */
static int
scsi_raw_format(void)
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	struct scsi_defect_hdr	defect_hdr;
	int			status;

	fmt_print("\n"
	    "Retry of formatting operation without any of the standard\n"
	    "mode selects and ignoring disk's Grown Defects list.  The\n"
	    "disk may be able to be reformatted this way if an earlier\n"
	    "formatting operation was interrupted by a power failure or\n"
	    "SCSI bus reset.  The Grown Defects list will be recreated\n"
	    "by format verification and surface analysis.\n\n");

	if (check("Retry format without mode selects and Grown Defects list")
		!= 0) {
		return (-1);
	}

	/*
	 * Construct the uscsi format ioctl.
	 * To format with the P and G list, we set the fmtData
	 * and cmpLst bits to zero.  To format with just the
	 * P list, we set the fmtData bit (meaning that we will
	 * send down a defect list in the data phase) and the
	 * cmpLst bit (meaning that the list we send is the
	 * complete G list), and a defect list header with
	 * a defect list length of zero.
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	(void) memset((char *)&defect_hdr, 0, sizeof (defect_hdr));

	cdb.scc_cmd		= SCMD_FORMAT;
	ucmd.uscsi_cdb		= (caddr_t)&cdb;
	ucmd.uscsi_cdblen	= CDB_GROUP0;
	/* No G list.   Send empty defect list to replace it */
	cdb.cdb_opaque[1]	= FPB_DATA | FPB_CMPLT | FPB_BFI;
	ucmd.uscsi_bufaddr	= (caddr_t)&defect_hdr;
	ucmd.uscsi_buflen	= sizeof (defect_hdr);
	defect_hdr.descriptor	= FDH_FOV | FDH_IMMED;

	/*
	 * Issue the format ioctl
	 */
	fmt_print("Formatting...\n");
	(void) fflush(stdout);
	status = uscsi_cmd(cur_file, &ucmd, F_NORMAL);

	/* check if format with immed was successfully accepted */
	if (status == 0) {
		/* immed accepted pool to completion */
		status = test_until_ready(cur_file);
	} else {
		/* clear defect header and try basecase format */
		(void) memset((char *)&defect_hdr, 0, sizeof (defect_hdr));
		status = uscsi_cmd(cur_file, &ucmd, F_NORMAL);
	}

	/* fmt_print(status ? "Format failed\n\n" : "Format ok\n\n"); */
	return (status);
}

/*
 * Estimate the time required for format operation (See 1163770).
 * format time = (5_revs * p4_heads * p4_cylinders) / p4_rpm
 * 5 revolutions (correspond to format_time keyword in format.dat file) are:
 *	1 rev.  for positioning
 *	2 rev.  for writing the track
 *	1 rev.  for positioning
 *	1 rev.  for cerifying the data integrity of the track
 * The return value is a good estimate on the formatting time in minutes.
 * Caller should add 50% margin to cover defect management overhead.
 */
int
scsi_format_time()
{
	struct mode_geometry		*page4;
	struct scsi_ms_header		header;
	int				status;
	int				p4_cylinders, p4_heads, p4_rpm;
	int				length;
	int				format_time;
	union {
		struct mode_geometry	page4;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page4;


	page4 = &u_page4.page4;
	(void) memset(&u_page4, 0, sizeof (u_page4));

	/*
	 * Issue a mode sense to determine the default parameters
	 * If it fail, try to use the saved or current instead.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
		MODE_SENSE_PC_DEFAULT, (caddr_t)page4,
		MAX_MODE_SENSE_SIZE, &header);

	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_SAVED, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
	}
	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_CURRENT, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
	}
	if (status) {
		return (0);
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.
	 */
	length = MODESENSE_PAGE_LEN(page4);
	if (length < MIN_PAGE4_LEN) {
		return (0);
	}

	page4->rpm = BE_16(page4->rpm);
	p4_cylinders = (page4->cyl_ub << 16) + (page4->cyl_mb << 8) +
		page4->cyl_lb;
	p4_heads = page4->heads;
	p4_rpm = page4->rpm;

	/*
	 * Some drives report 0 for page4->rpm, adjust it to AVG_RPM, 3600.
	 */
	if (p4_rpm < MIN_RPM || p4_rpm > MAX_RPM) {
		err_print("Mode sense page(4) reports rpm value as %d,"
			" adjusting it to %d\n", p4_rpm, AVG_RPM);
		p4_rpm = AVG_RPM;
	}

	if (p4_cylinders <= 0 || p4_heads <= 0)
		return (0);

	format_time = ((scsi_format_revolutions * p4_heads *
			p4_cylinders) + p4_rpm) / p4_rpm;

	if (option_msg && diag_msg) {
		err_print("       pcyl:    %d\n", p4_cylinders);
		err_print("      heads:    %d\n", p4_heads);
		err_print("        rpm:    %d\n", p4_rpm);
		err_print("format_time:    %d minutes\n", format_time);
	}
	return (format_time);
}

/*
 * Check disk error recovery parameters via mode sense.
 * Issue a mode select if we need to change something.
 */
/*ARGSUSED*/
static int
scsi_ms_page1(scsi2_flag)
	int	scsi2_flag;
{
	struct mode_err_recov		*page1;
	struct mode_err_recov		*fixed;
	struct scsi_ms_header		header;
	struct scsi_ms_header		fixed_hdr;
	int				status;
	int				tmp1, tmp2;
	int				flag;
	int				length;
	int				sp_flags;
	union {
		struct mode_err_recov	page1;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page1, u_fixed;


	page1 = &u_page1.page1;
	fixed = &u_fixed.page1;

	/*
	 * If debugging, issue mode senses on the default and
	 * current values.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
			MODE_SENSE_PC_DEFAULT, (caddr_t)page1,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
			MODE_SENSE_PC_CURRENT, (caddr_t)page1,
			MAX_MODE_SENSE_SIZE, &header);
	}

	/*
	 * Issue a mode sense to determine the saved parameters
	 * If the saved values fail, use the current instead.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
			MODE_SENSE_PC_SAVED, (caddr_t)page1,
			MAX_MODE_SENSE_SIZE, &header);
	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
			MODE_SENSE_PC_CURRENT, (caddr_t)page1,
			MAX_MODE_SENSE_SIZE, &header);
		if (status) {
			return (0);
		}
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.  Whatever the drive gives
	 * us, we return to the drive in the mode select,
	 * delta'ed by whatever we want to change.
	 */
	length = MODESENSE_PAGE_LEN(page1);
	if (length < MIN_PAGE1_LEN) {
		return (0);
	}

	/*
	 * Ask for changeable parameters.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
		MODE_SENSE_PC_CHANGEABLE, (caddr_t)fixed,
		MAX_MODE_SENSE_SIZE, &fixed_hdr);
	if (status || MODESENSE_PAGE_LEN(fixed) < MIN_PAGE1_LEN) {
		return (0);
	}

	/*
	 * We need to issue a mode select only if one or more
	 * parameters need to be changed, and those parameters
	 * are flagged by the drive as changeable.
	 */
	flag = 0;
	tmp1 = page1->read_retry_count;
	tmp2 = page1->write_retry_count;
	if (cur_dtype->dtype_options & SUP_READ_RETRIES &&
			fixed->read_retry_count != 0) {
		flag |= (page1->read_retry_count !=
				cur_dtype->dtype_read_retries);
		page1->read_retry_count = cur_dtype->dtype_read_retries;
	}
	if (length > 8) {
		if (cur_dtype->dtype_options & SUP_WRITE_RETRIES &&
				fixed->write_retry_count != 0) {
			flag |= (page1->write_retry_count !=
					cur_dtype->dtype_write_retries);
			page1->write_retry_count =
					cur_dtype->dtype_write_retries;
		}
	}
	/*
	 * Report any changes so far...
	 */
	if (flag && option_msg) {
		fmt_print(
"PAGE 1: read retries= %d (%d)  write retries= %d (%d)\n",
			page1->read_retry_count, tmp1,
			page1->write_retry_count, tmp2);
	}
	/*
	 * Apply any changes requested via the change list method
	 */
	flag |= apply_chg_list(DAD_MODE_ERR_RECOV, length,
		(uchar_t *)page1, (uchar_t *)fixed,
			cur_dtype->dtype_chglist);
	/*
	 * If no changes required, do not issue a mode select
	 */
	if (flag == 0) {
		return (0);
	}
	/*
	 * We always want to set the Page Format bit for mode
	 * selects.  Set the Save Page bit if the drive indicates
	 * that it can save this page via the mode sense.
	 */
	sp_flags = MODE_SELECT_PF;
	if (page1->mode_page.ps) {
		sp_flags |= MODE_SELECT_SP;
	}
	page1->mode_page.ps = 0;
	header.mode_header.length = 0;
	header.mode_header.device_specific = 0;
	status = uscsi_mode_select(cur_file, DAD_MODE_ERR_RECOV,
		sp_flags, (caddr_t)page1, length, &header);
	if (status && (sp_flags & MODE_SELECT_SP)) {
		/* If failed, try not saving mode select params. */
		sp_flags &= ~MODE_SELECT_SP;
		status = uscsi_mode_select(cur_file, DAD_MODE_ERR_RECOV,
			sp_flags, (caddr_t)page1, length, &header);
		}
	if (status && option_msg) {
		err_print("\
Warning: Using default error recovery parameters.\n\n");
	}

	/*
	 * If debugging, issue mode senses on the current and
	 * saved values, so we can see the result of the mode
	 * selects.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
			MODE_SENSE_PC_CURRENT, (caddr_t)page1,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_ERR_RECOV,
			MODE_SENSE_PC_SAVED, (caddr_t)page1,
			MAX_MODE_SENSE_SIZE, &header);
	}

	return (0);
}

/*
 * Check disk disconnect/reconnect parameters via mode sense.
 * Issue a mode select if we need to change something.
 */
/*ARGSUSED*/
static int
scsi_ms_page2(scsi2_flag)
	int	scsi2_flag;
{
	struct mode_disco_reco		*page2;
	struct mode_disco_reco		*fixed;
	struct scsi_ms_header		header;
	struct scsi_ms_header		fixed_hdr;
	int				status;
	int				flag;
	int				length;
	int				sp_flags;
	union {
		struct mode_disco_reco	page2;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page2, u_fixed;

	page2 = &u_page2.page2;
	fixed = &u_fixed.page2;

	/*
	 * If debugging, issue mode senses on the default and
	 * current values.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
			MODE_SENSE_PC_DEFAULT, (caddr_t)page2,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
			MODE_SENSE_PC_CURRENT, (caddr_t)page2,
			MAX_MODE_SENSE_SIZE, &header);
	}

	/*
	 * Issue a mode sense to determine the saved parameters
	 * If the saved values fail, use the current instead.
	 */
	status = uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
			MODE_SENSE_PC_SAVED, (caddr_t)page2,
			MAX_MODE_SENSE_SIZE, &header);
	if (status) {
		status = uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
			MODE_SENSE_PC_CURRENT, (caddr_t)page2,
			MAX_MODE_SENSE_SIZE, &header);
		if (status) {
			return (0);
		}
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.  Whatever the drive gives
	 * us, we return to the drive in the mode select,
	 * delta'ed by whatever we want to change.
	 */
	length = MODESENSE_PAGE_LEN(page2);
	if (length < MIN_PAGE2_LEN) {
		return (0);
	}

	/*
	 * Ask for changeable parameters.
	 */
	status = uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
		MODE_SENSE_PC_CHANGEABLE, (caddr_t)fixed,
		MAX_MODE_SENSE_SIZE, &fixed_hdr);
	if (status || MODESENSE_PAGE_LEN(fixed) < MIN_PAGE2_LEN) {
		return (0);
	}

	/*
	 * We need to issue a mode select only if one or more
	 * parameters need to be changed, and those parameters
	 * are flagged by the drive as changeable.
	 */
	flag = 0;
	/*
	 * Apply any changes requested via the change list method
	 */
	flag |= apply_chg_list(MODEPAGE_DISCO_RECO, length,
		(uchar_t *)page2, (uchar_t *)fixed,
			cur_dtype->dtype_chglist);
	/*
	 * If no changes required, do not issue a mode select
	 */
	if (flag == 0) {
		return (0);
	}
	/*
	 * We always want to set the Page Format bit for mode
	 * selects.  Set the Save Page bit if the drive indicates
	 * that it can save this page via the mode sense.
	 */
	sp_flags = MODE_SELECT_PF;
	if (page2->mode_page.ps) {
		sp_flags |= MODE_SELECT_SP;
	}
	page2->mode_page.ps = 0;
	header.mode_header.length = 0;
	header.mode_header.device_specific = 0;
	status = uscsi_mode_select(cur_file, MODEPAGE_DISCO_RECO,
		MODE_SELECT_SP, (caddr_t)page2, length, &header);
	if (status && (sp_flags & MODE_SELECT_SP)) {
		/* If failed, try not saving mode select params. */
		sp_flags &= ~MODE_SELECT_SP;
		status = uscsi_mode_select(cur_file, MODEPAGE_DISCO_RECO,
			sp_flags, (caddr_t)page2, length, &header);
		}
	if (status && option_msg) {
		err_print("Warning: Using default .\n\n");
	}

	/*
	 * If debugging, issue mode senses on the current and
	 * saved values, so we can see the result of the mode
	 * selects.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
			MODE_SENSE_PC_CURRENT, (caddr_t)page2,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, MODEPAGE_DISCO_RECO,
			MODE_SENSE_PC_SAVED, (caddr_t)page2,
			MAX_MODE_SENSE_SIZE, &header);
	}

	return (0);
}

/*
 * Check disk format parameters via mode sense.
 * Issue a mode select if we need to change something.
 */
/*ARGSUSED*/
static int
scsi_ms_page3(scsi2_flag)
	int	scsi2_flag;
{
	struct mode_format		*page3;
	struct mode_format		*fixed;
	struct scsi_ms_header		header;
	struct scsi_ms_header		fixed_hdr;
	int				status;
	int				tmp1, tmp2, tmp3;
	int				tmp4, tmp5, tmp6;
	int				flag;
	int				length;
	int				sp_flags;
	union {
		struct mode_format	page3;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page3, u_fixed;


	page3 = &u_page3.page3;
	fixed = &u_fixed.page3;

	/*
	 * If debugging, issue mode senses on the default and
	 * current values.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
			MODE_SENSE_PC_DEFAULT, (caddr_t)page3,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
			MODE_SENSE_PC_CURRENT, (caddr_t)page3,
			MAX_MODE_SENSE_SIZE, &header);
	}

	/*
	 * Issue a mode sense to determine the saved parameters
	 * If the saved values fail, use the current instead.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
			MODE_SENSE_PC_SAVED, (caddr_t)page3,
			MAX_MODE_SENSE_SIZE, &header);
	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
			MODE_SENSE_PC_CURRENT, (caddr_t)page3,
			MAX_MODE_SENSE_SIZE, &header);
		if (status) {
			return (0);
		}
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.  Whatever the drive gives
	 * us, we return to the drive in the mode select,
	 * delta'ed by whatever we want to change.
	 */
	length = MODESENSE_PAGE_LEN(page3);
	if (length < MIN_PAGE3_LEN) {
		return (0);
	}

	/*
	 * Ask for changeable parameters.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
		MODE_SENSE_PC_CHANGEABLE, (caddr_t)fixed,
		MAX_MODE_SENSE_SIZE, &fixed_hdr);
	if (status || MODESENSE_PAGE_LEN(fixed) < MIN_PAGE3_LEN) {
		return (0);
	}

	/*
	 * We need to issue a mode select only if one or more
	 * parameters need to be changed, and those parameters
	 * are flagged by the drive as changeable.
	 */
	tmp1 = page3->track_skew;
	tmp2 = page3->cylinder_skew;
	tmp3 = page3->sect_track;
	tmp4 = page3->tracks_per_zone;
	tmp5 = page3->alt_tracks_vol;
	tmp6 = page3->alt_sect_zone;

	flag = (page3->data_bytes_sect != SECSIZE);
	page3->data_bytes_sect = SECSIZE;

	flag |= (page3->interleave != 1);
	page3->interleave = 1;

	if (cur_dtype->dtype_options & SUP_CYLSKEW &&
					fixed->cylinder_skew != 0) {
		flag |= (page3->cylinder_skew != cur_dtype->dtype_cyl_skew);
		page3->cylinder_skew = cur_dtype->dtype_cyl_skew;
	}
	if (cur_dtype->dtype_options & SUP_TRKSKEW &&
					fixed->track_skew != 0) {
		flag |= (page3->track_skew != cur_dtype->dtype_trk_skew);
		page3->track_skew = cur_dtype->dtype_trk_skew;
	}
	if (cur_dtype->dtype_options & SUP_PSECT &&
					fixed->sect_track != 0) {
		flag |= (page3->sect_track != psect);
		page3->sect_track = (ushort_t)psect;
	}
	if (cur_dtype->dtype_options & SUP_TRKS_ZONE &&
					fixed->tracks_per_zone != 0) {
		flag |= (page3->tracks_per_zone != cur_dtype->dtype_trks_zone);
		page3->tracks_per_zone = cur_dtype->dtype_trks_zone;
	}
	if (cur_dtype->dtype_options & SUP_ASECT &&
					fixed->alt_sect_zone != 0) {
		flag |= (page3->alt_sect_zone != cur_dtype->dtype_asect);
		page3->alt_sect_zone = cur_dtype->dtype_asect;
	}
	if (cur_dtype->dtype_options & SUP_ATRKS &&
					fixed->alt_tracks_vol != 0) {
		flag |= (page3->alt_tracks_vol != cur_dtype->dtype_atrks);
		page3->alt_tracks_vol = cur_dtype->dtype_atrks;
	}
	/*
	 * Notify user of any changes so far
	 */
	if (flag && option_msg) {
		fmt_print("PAGE 3: trk skew= %d (%d)   cyl skew= %d (%d)   ",
			page3->track_skew, tmp1, page3->cylinder_skew, tmp2);
		fmt_print("sects/trk= %d (%d)\n", page3->sect_track, tmp3);
		fmt_print("        trks/zone= %d (%d)   alt trks= %d (%d)   ",
			page3->tracks_per_zone, tmp4,
			page3->alt_tracks_vol, tmp5);
		fmt_print("alt sects/zone= %d (%d)\n",
				page3->alt_sect_zone, tmp6);
	}
	/*
	 * Apply any changes requested via the change list method
	 */
	flag |= apply_chg_list(DAD_MODE_FORMAT, length,
		(uchar_t *)page3, (uchar_t *)fixed,
			cur_dtype->dtype_chglist);
	/*
	 * If no changes required, do not issue a mode select
	 */
	if (flag == 0) {
		return (0);
	}
	/*
	 * Issue a mode select
	 */
	/*
	 * We always want to set the Page Format bit for mode
	 * selects.  Set the Save Page bit if the drive indicates
	 * that it can save this page via the mode sense.
	 */
	sp_flags = MODE_SELECT_PF;
	if (page3->mode_page.ps) {
		sp_flags |= MODE_SELECT_SP;
	}
	page3->mode_page.ps = 0;
	header.mode_header.length = 0;
	header.mode_header.device_specific = 0;
	status = uscsi_mode_select(cur_file, DAD_MODE_FORMAT,
		MODE_SELECT_SP, (caddr_t)page3, length, &header);
	if (status && (sp_flags & MODE_SELECT_SP)) {
		/* If failed, try not saving mode select params. */
		sp_flags &= ~MODE_SELECT_SP;
		status = uscsi_mode_select(cur_file, DAD_MODE_FORMAT,
			sp_flags, (caddr_t)page3, length, &header);
		}
	if (status && option_msg) {
		err_print("Warning: Using default drive format parameters.\n");
		err_print("Warning: Drive format may not be correct.\n\n");
	}

	/*
	 * If debugging, issue mode senses on the current and
	 * saved values, so we can see the result of the mode
	 * selects.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
			MODE_SENSE_PC_CURRENT, (caddr_t)page3,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_FORMAT,
			MODE_SENSE_PC_SAVED, (caddr_t)page3,
			MAX_MODE_SENSE_SIZE, &header);
	}

	return (0);
}

/*
 * Check disk geometry parameters via mode sense.
 * Issue a mode select if we need to change something.
 */
/*ARGSUSED*/
static int
scsi_ms_page4(scsi2_flag)
	int	scsi2_flag;
{
	struct mode_geometry		*page4;
	struct mode_geometry		*fixed;
	struct scsi_ms_header		header;
	struct scsi_ms_header		fixed_hdr;
	int				status;
	int				tmp1, tmp2;
	int				flag;
	int				length;
	int				sp_flags;
	union {
		struct mode_geometry	page4;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page4, u_fixed;

	page4 = &u_page4.page4;
	fixed = &u_fixed.page4;

	/*
	 * If debugging, issue mode senses on the default and
	 * current values.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_DEFAULT, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_CURRENT, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
	}

	/*
	 * Issue a mode sense to determine the saved parameters
	 * If the saved values fail, use the current instead.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_SAVED, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_CURRENT, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
		if (status) {
			return (0);
		}
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.  Whatever the drive gives
	 * us, we return to the drive in the mode select,
	 * delta'ed by whatever we want to change.
	 */
	length = MODESENSE_PAGE_LEN(page4);
	if (length < MIN_PAGE4_LEN) {
		return (0);
	}

	/*
	 * Ask for changeable parameters.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
		MODE_SENSE_PC_CHANGEABLE, (caddr_t)fixed,
		MAX_MODE_SENSE_SIZE, &fixed_hdr);
	if (status || MODESENSE_PAGE_LEN(fixed) < MIN_PAGE4_LEN) {
		return (0);
	}

	/*
	 * We need to issue a mode select only if one or more
	 * parameters need to be changed, and those parameters
	 * are flagged by the drive as changeable.
	 */
	tmp1 = (page4->cyl_ub << 16) + (page4->cyl_mb << 8) + page4->cyl_lb;
	tmp2 = page4->heads;

	flag = 0;
	if ((cur_dtype->dtype_options & SUP_PHEAD) && fixed->heads != 0) {
		flag |= (page4->heads != phead);
		page4->heads = phead;
	}
	/*
	 * Notify user of changes so far
	 */
	if (flag && option_msg) {
		fmt_print("PAGE 4:   cylinders= %d    heads= %d (%d)\n",
			tmp1, page4->heads, tmp2);
	}
	/*
	 * Apply any changes requested via the change list method
	 */
	flag |= apply_chg_list(DAD_MODE_GEOMETRY, length,
		(uchar_t *)page4, (uchar_t *)fixed,
			cur_dtype->dtype_chglist);
	/*
	 * If no changes required, do not issue a mode select
	 */
	if (flag == 0) {
		return (0);
	}
	/*
	 * Issue a mode select
	 */
	/*
	 * We always want to set the Page Format bit for mode
	 * selects.  Set the Save Page bit if the drive indicates
	 * that it can save this page via the mode sense.
	 */
	sp_flags = MODE_SELECT_PF;
	if (page4->mode_page.ps) {
		sp_flags |= MODE_SELECT_SP;
	}
	page4->mode_page.ps = 0;
	header.mode_header.length = 0;
	header.mode_header.device_specific = 0;
	status = uscsi_mode_select(cur_file, DAD_MODE_GEOMETRY,
		MODE_SELECT_SP, (caddr_t)page4, length, &header);
	if (status && (sp_flags & MODE_SELECT_SP)) {
		/* If failed, try not saving mode select params. */
		sp_flags &= ~MODE_SELECT_SP;
		status = uscsi_mode_select(cur_file, DAD_MODE_GEOMETRY,
			sp_flags, (caddr_t)page4, length, &header);
		}
	if (status && option_msg) {
		err_print("Warning: Using default drive geometry.\n\n");
	}

	/*
	 * If debugging, issue mode senses on the current and
	 * saved values, so we can see the result of the mode
	 * selects.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_CURRENT, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_GEOMETRY,
			MODE_SENSE_PC_SAVED, (caddr_t)page4,
			MAX_MODE_SENSE_SIZE, &header);
	}

	return (0);
}

/*
 * Check SCSI-2 disk cache parameters via mode sense.
 * Issue a mode select if we need to change something.
 */
/*ARGSUSED*/
static int
scsi_ms_page8(scsi2_flag)
	int	scsi2_flag;
{
	struct mode_cache		*page8;
	struct mode_cache		*fixed;
	struct scsi_ms_header		header;
	struct scsi_ms_header		fixed_hdr;
	int				status;
	int				flag;
	int				length;
	int				sp_flags;
	union {
		struct mode_cache	page8;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page8, u_fixed;

	page8 = &u_page8.page8;
	fixed = &u_fixed.page8;

	/*
	 * Only SCSI-2 devices support this page
	 */
	if (!scsi2_flag) {
		return (0);
	}

	/*
	 * If debugging, issue mode senses on the default and
	 * current values.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
			MODE_SENSE_PC_DEFAULT, (caddr_t)page8,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
			MODE_SENSE_PC_CURRENT, (caddr_t)page8,
			MAX_MODE_SENSE_SIZE, &header);
	}

	/*
	 * Issue a mode sense to determine the saved parameters
	 * If the saved values fail, use the current instead.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
			MODE_SENSE_PC_SAVED, (caddr_t)page8,
			MAX_MODE_SENSE_SIZE, &header);
	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
			MODE_SENSE_PC_CURRENT, (caddr_t)page8,
			MAX_MODE_SENSE_SIZE, &header);
		if (status) {
			return (0);
		}
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.  Whatever the drive gives
	 * us, we return to the drive in the mode select,
	 * delta'ed by whatever we want to change.
	 */
	length = MODESENSE_PAGE_LEN(page8);
	if (length < MIN_PAGE8_LEN) {
		return (0);
	}

	/*
	 * Ask for changeable parameters.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
		MODE_SENSE_PC_CHANGEABLE, (caddr_t)fixed,
		MAX_MODE_SENSE_SIZE, &fixed_hdr);
	if (status || MODESENSE_PAGE_LEN(fixed) < MIN_PAGE8_LEN) {
		return (0);
	}

	/*
	 * We need to issue a mode select only if one or more
	 * parameters need to be changed, and those parameters
	 * are flagged by the drive as changeable.
	 */
	flag = 0;
	/*
	 * Apply any changes requested via the change list method
	 */
	flag |= apply_chg_list(DAD_MODE_CACHE, length,
		(uchar_t *)page8, (uchar_t *)fixed,
			cur_dtype->dtype_chglist);
	/*
	 * If no changes required, do not issue a mode select
	 */
	if (flag == 0) {
		return (0);
	}
	/*
	 * Issue a mode select
	 */
	/*
	 * We always want to set the Page Format bit for mode
	 * selects.  Set the Save Page bit if the drive indicates
	 * that it can save this page via the mode sense.
	 */
	sp_flags = MODE_SELECT_PF;
	if (page8->mode_page.ps) {
		sp_flags |= MODE_SELECT_SP;
	}
	page8->mode_page.ps = 0;
	header.mode_header.length = 0;
	header.mode_header.device_specific = 0;
	status = uscsi_mode_select(cur_file, DAD_MODE_CACHE,
		sp_flags, (caddr_t)page8, length, &header);
	if (status && (sp_flags & MODE_SELECT_SP)) {
		/* If failed, try not saving mode select params. */
		sp_flags &= ~MODE_SELECT_SP;
		status = uscsi_mode_select(cur_file, DAD_MODE_CACHE,
			sp_flags, (caddr_t)page8, length, &header);
		}
	if (status && option_msg) {
		err_print("\
Warning: Using default SCSI-2 cache parameters.\n\n");
	}

	/*
	 * If debugging, issue mode senses on the current and
	 * saved values, so we can see the result of the mode
	 * selects.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
			MODE_SENSE_PC_CURRENT, (caddr_t)page8,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE,
			MODE_SENSE_PC_SAVED, (caddr_t)page8,
			MAX_MODE_SENSE_SIZE, &header);
	}

	return (0);
}

/*
 * Check CCS disk cache parameters via mode sense.
 * Issue a mode select if we need to change something.
 */
/*ARGSUSED*/
static int
scsi_ms_page38(scsi2_flag)
	int	scsi2_flag;
{
	struct mode_cache_ccs		*page38;
	struct mode_cache_ccs		*fixed;
	struct scsi_ms_header		header;
	struct scsi_ms_header		fixed_hdr;
	int				status;
	int				tmp1, tmp2, tmp3, tmp4;
	int				flag;
	int				length;
	int				sp_flags;
	union {
		struct mode_cache_ccs	page38;
		char			rawbuf[MAX_MODE_SENSE_SIZE];
	} u_page38, u_fixed;

	/*
	 * First, determine if we need to look at page 38 at all.
	 * Not all devices support it.
	 */
	if (((cur_dtype->dtype_options & (SUP_CACHE | SUP_PREFETCH |
		SUP_CACHE_MIN | SUP_CACHE_MAX)) == 0) &&
			(!chg_list_affects_page(cur_dtype->dtype_chglist,
				0x38))) {
		return (0);
	}

	page38 = &u_page38.page38;
	fixed = &u_fixed.page38;

	/*
	 * If debugging, issue mode senses on the default and
	 * current values.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
			MODE_SENSE_PC_DEFAULT, (caddr_t)page38,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
			MODE_SENSE_PC_CURRENT, (caddr_t)page38,
			MAX_MODE_SENSE_SIZE, &header);
	}

	/*
	 * Issue a mode sense to determine the saved parameters
	 * If the saved values fail, use the current instead.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
			MODE_SENSE_PC_SAVED, (caddr_t)page38,
			MAX_MODE_SENSE_SIZE, &header);
	if (status) {
		status = uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
			MODE_SENSE_PC_CURRENT, (caddr_t)page38,
			MAX_MODE_SENSE_SIZE, &header);
		if (status) {
			return (0);
		}
	}

	/*
	 * We only need the common subset between the CCS
	 * and SCSI-2 structures, so we can treat both
	 * cases identically.  Whatever the drive gives
	 * us, we return to the drive in the mode select,
	 * delta'ed by whatever we want to change.
	 */
	length = MODESENSE_PAGE_LEN(page38);
	if (length < MIN_PAGE38_LEN) {
		return (0);
	}

	/*
	 * Ask for changeable parameters.
	 */
	status = uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
		MODE_SENSE_PC_CHANGEABLE, (caddr_t)fixed,
		MAX_MODE_SENSE_SIZE, &fixed_hdr);
	if (status || MODESENSE_PAGE_LEN(fixed) < MIN_PAGE38_LEN) {
		return (0);
	}

	/*
	 * We need to issue a mode select only if one or more
	 * parameters need to be changed, and those parameters
	 * are flagged by the drive as changeable.
	 */
	tmp1 = page38->mode;
	tmp2 = page38->threshold;
	tmp3 = page38->min_prefetch;
	tmp4 = page38->max_prefetch;

	flag = 0;
	if ((cur_dtype->dtype_options & SUP_CACHE) &&
			(fixed->mode & cur_dtype->dtype_cache) ==
				cur_dtype->dtype_cache) {
		flag |= (page38->mode != cur_dtype->dtype_cache);
		page38->mode = cur_dtype->dtype_cache;
	}
	if ((cur_dtype->dtype_options & SUP_PREFETCH) &&
		(fixed->threshold & cur_dtype->dtype_threshold) ==
				cur_dtype->dtype_threshold) {
		flag |= (page38->threshold != cur_dtype->dtype_threshold);
		page38->threshold = cur_dtype->dtype_threshold;
	}
	if ((cur_dtype->dtype_options & SUP_CACHE_MIN) &&
		(fixed->min_prefetch & cur_dtype->dtype_prefetch_min) ==
				cur_dtype->dtype_prefetch_min) {
		flag |= (page38->min_prefetch != cur_dtype->dtype_prefetch_min);
		page38->min_prefetch = cur_dtype->dtype_prefetch_min;
	}
	if ((cur_dtype->dtype_options & SUP_CACHE_MAX) &&
		(fixed->max_prefetch & cur_dtype->dtype_prefetch_max) ==
				cur_dtype->dtype_prefetch_max) {
		flag |= (page38->max_prefetch != cur_dtype->dtype_prefetch_max);
		page38->max_prefetch = cur_dtype->dtype_prefetch_max;
	}
	/*
	 * Notify the user of changes up to this point
	 */
	if (flag && option_msg) {
		fmt_print("PAGE 38: cache mode= 0x%x (0x%x)\n",
					page38->mode, tmp1);
		fmt_print("         min. prefetch multiplier= %d   ",
					page38->min_multiplier);
		fmt_print("max. prefetch multiplier= %d\n",
					page38->max_multiplier);
		fmt_print("         threshold= %d (%d)   ",
					page38->threshold, tmp2);
		fmt_print("min. prefetch= %d (%d)   ",
					page38->min_prefetch, tmp3);
		fmt_print("max. prefetch= %d (%d)\n",
					page38->max_prefetch, tmp4);
	}
	/*
	 * Apply any changes requested via the change list method
	 */
	flag |= apply_chg_list(DAD_MODE_CACHE_CCS, length,
		(uchar_t *)page38, (uchar_t *)fixed,
			cur_dtype->dtype_chglist);
	/*
	 * If no changes required, do not issue a mode select
	 */
	if (flag == 0) {
		return (0);
	}
	/*
	 * Issue a mode select
	 *
	 * We always want to set the Page Format bit for mode
	 * selects.  Set the Save Page bit if the drive indicates
	 * that it can save this page via the mode sense.
	 */
	sp_flags = MODE_SELECT_PF;
	if (page38->mode_page.ps) {
		sp_flags |= MODE_SELECT_SP;
	}
	page38->mode_page.ps = 0;
	header.mode_header.length = 0;
	header.mode_header.device_specific = 0;
	status = uscsi_mode_select(cur_file, DAD_MODE_CACHE_CCS,
		sp_flags, (caddr_t)page38, length, &header);
	if (status && (sp_flags & MODE_SELECT_SP)) {
		/* If failed, try not saving mode select params. */
		sp_flags &= ~MODE_SELECT_SP;
		status = uscsi_mode_select(cur_file, DAD_MODE_CACHE_CCS,
			sp_flags, (caddr_t)page38, length, &header);
		}
	if (status && option_msg) {
		err_print("Warning: Using default CCS cache parameters.\n\n");
	}

	/*
	 * If debugging, issue mode senses on the current and
	 * saved values, so we can see the result of the mode
	 * selects.
	 */
	if (option_msg && diag_msg) {
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
			MODE_SENSE_PC_CURRENT, (caddr_t)page38,
			MAX_MODE_SENSE_SIZE, &header);
		(void) uscsi_mode_sense(cur_file, DAD_MODE_CACHE_CCS,
			MODE_SENSE_PC_SAVED, (caddr_t)page38,
			MAX_MODE_SENSE_SIZE, &header);
	}

	return (0);
}


/*
 * Extract the manufacturer's defect list.
 */
int
scsi_ex_man(list)
	struct  defect_list	*list;
{
	int	i;

	i = scsi_read_defect_data(list, DLD_MAN_DEF_LIST);
	if (i != 0)
		return (i);
	list->flags &= ~LIST_PGLIST;
	return (0);
}

/*
 * Extract the current defect list.
 * For embedded scsi drives, this means both the manufacturer's (P)
 * and the grown (G) lists.
 */
int
scsi_ex_cur(list)
	struct  defect_list *list;
{
	int	i;

	i = scsi_read_defect_data(list, DLD_GROWN_DEF_LIST|DLD_MAN_DEF_LIST);
	if (i != 0)
		return (i);
	list->flags |= LIST_PGLIST;
	return (0);
}


/*
 * Extract the grown list only
 */
int
scsi_ex_grown(list)
	struct defect_list *list;
{
	int	i;

	i = scsi_read_defect_data(list, DLD_GROWN_DEF_LIST);
	if (i != 0)
		return (i);
	list->flags |= LIST_PGLIST;
	return (0);
}


static int
scsi_read_defect_data(list, pglist_flags)
	struct  defect_list	*list;
	int			pglist_flags;
{
	struct uscsi_cmd	ucmd;
	char			rqbuf[255];
	union scsi_cdb		cdb;
	struct scsi_defect_list	*defects;
	struct scsi_defect_list	def_list;
	struct scsi_defect_hdr	*hdr;
	int			status;
	int			nbytes;
	int			len;	/* returned defect list length */
	struct scsi_extended_sense	*rq;

	hdr = (struct scsi_defect_hdr *)&def_list;

	/*
	 * First get length of list by asking for the header only.
	 */
	(void) memset((char *)&def_list, 0, sizeof (def_list));

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	(void) memset((char *)rqbuf, 0, 255);
	cdb.scc_cmd = SCMD_READ_DEFECT_LIST;
	FORMG1COUNT(&cdb, sizeof (struct scsi_defect_hdr));
	cdb.cdb_opaque[2] = pglist_flags | DLD_BFI_FORMAT;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP1;
	ucmd.uscsi_bufaddr = (caddr_t)hdr;
	ucmd.uscsi_buflen = sizeof (struct scsi_defect_hdr);
	ucmd.uscsi_rqbuf = rqbuf;
	ucmd.uscsi_rqlen = sizeof (rqbuf);
	ucmd.uscsi_rqresid = sizeof (rqbuf);
	rq = (struct scsi_extended_sense *)ucmd.uscsi_rqbuf;

	status = uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	if (status != 0) {
		/*
		 * check if read_defect_list_is_supported.
		 */
		if (ucmd.uscsi_rqstatus == STATUS_GOOD &&
			rq->es_key == KEY_ILLEGAL_REQUEST &&
					rq->es_add_code == INVALID_OPCODE) {
			err_print("\nWARNING: Current Disk does not support"
				" defect lists. \n");
		} else
		if (option_msg) {
			err_print("No %s defect list.\n",
				pglist_flags & DLD_GROWN_DEF_LIST ?
				"grown" : "manufacturer's");
		}
		return (-1);
	}

	/*
	 * Read the full list the second time
	 */
	hdr->length = BE_16(hdr->length);
	len = hdr->length;
	nbytes = len + sizeof (struct scsi_defect_hdr);

	defects = zalloc(nbytes);
	*(struct scsi_defect_hdr *)defects = *(struct scsi_defect_hdr *)hdr;

	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = SCMD_READ_DEFECT_LIST;
	FORMG1COUNT(&cdb, nbytes);
	cdb.cdb_opaque[2] = pglist_flags | DLD_BFI_FORMAT;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP1;
	ucmd.uscsi_bufaddr = (caddr_t)defects;
	ucmd.uscsi_buflen = nbytes;
	status = uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	if (status) {
		err_print("can't read defect list 2nd time");
		destroy_data((char *)defects);
		return (-1);
	}

	defects->length = BE_16(defects->length);

	if (len != hdr->length) {
		err_print("not enough defects");
		destroy_data((char *)defects);
		return (-1);
	}
	scsi_convert_list_to_new(list, (struct scsi_defect_list *)defects,
			DLD_BFI_FORMAT);
	destroy_data((char *)defects);
	return (0);
}


/*
 * Map a block.
 */
/*ARGSUSED*/
static int
scsi_repair(bn, flag)
	uint64_t	bn;
	int		flag;
{
	struct uscsi_cmd		ucmd;
	union scsi_cdb			cdb;
	struct scsi_reassign_blk	defect_list;

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	(void) memset((char *)&defect_list, 0,
		sizeof (struct scsi_reassign_blk));
	cdb.scc_cmd = SCMD_REASSIGN_BLOCK;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	ucmd.uscsi_bufaddr = (caddr_t)&defect_list;
	ucmd.uscsi_buflen = sizeof (struct scsi_reassign_blk);
	defect_list.length = sizeof (defect_list.defect);
	defect_list.length = BE_16(defect_list.length);
	defect_list.defect = bn;
	defect_list.defect = BE_32(defect_list.defect);
	return (uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT));
}

/*
 * Convert a SCSI-style defect list to our generic format.
 * We can handle different format lists.
 */
static void
scsi_convert_list_to_new(list, def_list, list_format)
	struct defect_list		*list;
	struct scsi_defect_list		*def_list;
	int				 list_format;
{
	register struct scsi_bfi_defect	*old_defect, *old_defect1;
	register struct defect_entry	*new_defect;
	register int			len, new_len, obfi, nbfi;
	register int			i;
	int				old_cyl, new_cyl;
	unsigned char			*cp;


	switch (list_format) {

	case DLD_BFI_FORMAT:
		/*
		 * Allocate space for the rest of the list.
		 */
		len = def_list->length / sizeof (struct scsi_bfi_defect);
		old_defect = def_list->list;
		new_defect = (struct defect_entry *)
				zalloc(LISTSIZE(len) * SECSIZE);

		list->header.magicno = (uint_t)DEFECT_MAGIC;
		list->list = new_defect;

		for (i = 0, new_len = 0; i < len; new_defect++, new_len++) {
			cp = (unsigned char *)old_defect;
			new_defect->cyl = (cp[0] << 16 | cp[1] << 8) | cp[2];
			new_defect->head = old_defect->head;
			new_defect->bfi = (int)old_defect->bytes_from_index;
			new_defect->bfi = BE_32(new_defect->bfi);
			new_defect->nbits = 0;	/* size of defect */
			old_defect1 = old_defect++;
			i++;
			/*
			 * Since we reached the end of the list, old_defect
			 * now points to an invalid reference, since it got
			 * incremented in the above operation. So we don't
			 * need to proceed further. new_len needs to be
			 * incremented to account for the last element.
			 */
			if (i == len) {
				new_len++;
				break;
			}
			obfi = new_defect->bfi;
			nbfi = (int)old_defect->bytes_from_index;
			nbfi = BE_32(nbfi);

			old_cyl =  new_defect->cyl;
			cp = (unsigned char *)old_defect;
			new_cyl = (cp[0] << 16 | cp[1] << 8) | cp[2];


			/*
			 * Merge adjacent contiguous defect entries into one
			 * and update the length of the defect
			 */
			while ((i < len) &&
				(old_cyl  == new_cyl) &&
				(old_defect->head == old_defect1->head) &&
				(nbfi == (obfi + BITSPERBYTE))) {
				old_defect1 = old_defect++;
				cp = (unsigned char *)old_defect;
				new_cyl = (cp[0] << 16 | cp[1] << 8) | cp[2];
				obfi = (int)old_defect1->bytes_from_index;
				obfi = BE_32(obfi);
				nbfi = (int)old_defect->bytes_from_index;
				nbfi = BE_32(nbfi);
				new_defect->nbits += (8*BITSPERBYTE);
				i++;
			}
		}

		list->header.count = new_len;
		break;

	default:
		err_print("scsi_convert_list_to_new: can't deal with it\n");
		exit(0);
		/*NOTREACHED*/
	}

	(void) checkdefsum(list, CK_MAKESUM);
}



/*
 * Execute a command and determine the result.
 * Uses the "uscsi" ioctl interface, which is
 * fully supported.
 *
 * If the user wants request sense data to be returned
 * in case of error then , the "uscsi_cmd" structure
 * should have the request sense buffer allocated in
 * uscsi_rqbuf.
 *
 */
int
uscsi_cmd(fd, ucmd, flags)
	int			fd;
	struct uscsi_cmd	*ucmd;
	int			flags;
{
	struct scsi_extended_sense	*rq;
	char				rqbuf[255];
	int				status;
	int				rqlen;
	int				timeout = 0;

	/*
	 * Set function flags for driver.
	 */
	ucmd->uscsi_flags = USCSI_ISOLATE;
	if (flags & F_SILENT) {
		ucmd->uscsi_flags |= USCSI_SILENT;
	}
	if (flags & F_RQENABLE) {
		ucmd->uscsi_flags |= USCSI_RQENABLE;
	}

	/*
	 * If this command will perform a read, set the USCSI_READ flag
	 */
	if (ucmd->uscsi_buflen > 0) {
		/*
		 * uscsi_cdb is declared as a caddr_t, so any CDB
		 * command byte with the MSB set will result in a
		 * compiler error unless we cast to an unsigned value.
		 */
		switch ((uint8_t)ucmd->uscsi_cdb[0]) {
		case SCMD_READ:
		case SCMD_READ|SCMD_GROUP1:
		case SCMD_READ|SCMD_GROUP4:
		case SCMD_MODE_SENSE:
		case SCMD_INQUIRY:
		case SCMD_READ_DEFECT_LIST:
		case SCMD_READ_CAPACITY:
		case SCMD_SVC_ACTION_IN_G4:
			ucmd->uscsi_flags |= USCSI_READ;
			break;
		}
	}

	/*
	 * Set timeout: 30 seconds for all commands except format
	 */
	switch (ucmd->uscsi_cdb[0]) {
	case SCMD_FORMAT:
		if (ucmd->uscsi_timeout == 0) {
			ucmd->uscsi_timeout = scsi_format_timeout;
			/*
			 * Get the timeout value computed using page4 geometry.
			 * add 50% margin to cover defect management overhead.
			 * add another 50% margin to have a safe timeout.
			 * If it exceeds 2 hours then use this value.
			 */
			if ((timeout = scsi_format_time()) > 0) {
				timeout *= 60;	/* convert to seconds */
				timeout += timeout;
				/*
				 * formatting drives with huge capacity
				 * will cause these heuristics to come
				 * up with times that overflow ~9 hours
				 */
				if (timeout > SHRT_MAX)
					timeout = SHRT_MAX;
				if (timeout > scsi_format_timeout)
					ucmd->uscsi_timeout = timeout;
			}
		}
		if (option_msg && diag_msg) {
			err_print("format_timeout set to %d seconds, %d"
				" required\n", ucmd->uscsi_timeout, timeout);
		}
		break;

	default:
		ucmd->uscsi_timeout = 30;		/* 30 seconds */
		break;
	}

	/*
	 * Set up Request Sense buffer
	 */
	ucmd->uscsi_flags |= USCSI_RQENABLE;

	if (ucmd->uscsi_rqbuf == NULL)  {
		ucmd->uscsi_rqbuf = rqbuf;
		ucmd->uscsi_rqlen = sizeof (rqbuf);
		ucmd->uscsi_rqresid = sizeof (rqbuf);
	}
	ucmd->uscsi_rqstatus = IMPOSSIBLE_SCSI_STATUS;

	/*
	 * Clear global error state
	 */
	media_error = 0;

	/*
	 * Execute the ioctl
	 */
	status = ioctl(fd, USCSICMD, ucmd);
	if (status == 0 && ucmd->uscsi_status == 0) {
		return (status);
	}

#ifdef sparc
	/*
	 * Check the status and return appropriate errors if the disk is
	 * unavailable (could be formatting) or reserved (by other host).
	 * In either case we can not talk to the disk now.
	 */
	if (status == -1 && errno == EAGAIN) {
		disk_error = DISK_STAT_UNAVAILABLE;
		return (DSK_UNAVAILABLE);
	}
	if ((ucmd->uscsi_status & STATUS_MASK) == STATUS_RESERVATION_CONFLICT) {
		disk_error = DISK_STAT_RESERVED;
		return (DSK_RESERVED);
	}
	/*
	 * Check for physically removed or completely unresponsive drive
	 */
	if (status == -1 && !ucmd->uscsi_status && errno == EIO) {
		disk_error = DISK_STAT_UNAVAILABLE;
		return (DSK_UNAVAILABLE);
	}
#endif /* sparc */

	/*
	 * If an automatic Request Sense gave us valid
	 * info about the error, we may be able to use
	 * that to print a reasonable error msg.
	 */
	if (ucmd->uscsi_rqstatus == IMPOSSIBLE_SCSI_STATUS) {
		if (option_msg && diag_msg) {
			err_print("No request sense for command %s\n",
				scsi_find_command_name(ucmd->uscsi_cdb[0]));
		}
		return (-1);
	}
	if (ucmd->uscsi_rqstatus != STATUS_GOOD) {
		if (option_msg && diag_msg) {
			err_print("Request sense status for command %s: 0x%x\n",
				scsi_find_command_name(ucmd->uscsi_cdb[0]),
				ucmd->uscsi_rqstatus);
		}
		return (-1);
	}
	rq = (struct scsi_extended_sense *)ucmd->uscsi_rqbuf;
	rqlen = ucmd->uscsi_rqlen - ucmd->uscsi_rqresid;
	if ((((int)rq->es_add_len) + 8) < MIN_REQUEST_SENSE_LEN ||
			rq->es_class != CLASS_EXTENDED_SENSE ||
				rqlen < MIN_REQUEST_SENSE_LEN) {
		if (option_msg) {
			err_print("Request sense for command %s failed\n",
				scsi_find_command_name(ucmd->uscsi_cdb[0]));
		}
		if (option_msg && diag_msg) {
			err_print("Sense data:\n");
			dump("", (caddr_t)rqbuf, rqlen, HEX_ONLY);
		}
		return (-1);
	}

	/*
	 * If the failed command is a Mode Select, and the
	 * target is indicating that it has rounded one of
	 * the mode select parameters, as defined in the SCSI-2
	 * specification, then we should accept the command
	 * as successful.
	 */
	if (ucmd->uscsi_cdb[0] == SCMD_MODE_SELECT) {
		if (rq->es_key == KEY_RECOVERABLE_ERROR &&
			rq->es_add_code == ROUNDED_PARAMETER &&
			rq->es_qual_code == 0) {
				return (0);
		}
	}

	switch (rq->es_key) {
	case KEY_NOT_READY:
		disk_error = DISK_STAT_NOTREADY;
		break;
	case KEY_DATA_PROTECT:
		disk_error = DISK_STAT_DATA_PROTECT;
		break;
	}

	if (flags & F_ALLERRS) {
		media_error = (rq->es_key == KEY_MEDIUM_ERROR);
	}
	if (!(flags & F_SILENT) || option_msg) {
		scsi_printerr(ucmd, rq, rqlen);
	}
	if ((rq->es_key != KEY_RECOVERABLE_ERROR) || (flags & F_ALLERRS)) {
		return (-1);
	}
	return (0);
}


/*
 * Execute a uscsi mode sense command.
 * This can only be used to return one page at a time.
 * Return the mode header/block descriptor and the actual
 * page data separately - this allows us to support
 * devices which return either 0 or 1 block descriptors.
 * Whatever a device gives us in the mode header/block descriptor
 * will be returned to it upon subsequent mode selects.
 */
int
uscsi_mode_sense(fd, page_code, page_control, page_data, page_size, header)
	int	fd;			/* file descriptor */
	int	page_code;		/* requested page number */
	int	page_control;		/* current, changeable, etc. */
	caddr_t	page_data;		/* place received data here */
	int	page_size;		/* size of page_data */
	struct	scsi_ms_header *header;	/* mode header/block descriptor */
{
	caddr_t			mode_sense_buf;
	struct mode_header	*hdr;
	struct mode_page	*pg;
	int			nbytes;
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	int			status;
	int			maximum;

	assert(page_size >= 0 && page_size < 256);
	assert(page_control == MODE_SENSE_PC_CURRENT ||
		page_control == MODE_SENSE_PC_CHANGEABLE ||
			page_control == MODE_SENSE_PC_DEFAULT ||
				page_control == MODE_SENSE_PC_SAVED);
	/*
	 * Allocate a buffer for the mode sense headers
	 * and mode sense data itself.
	 */
	nbytes = sizeof (struct block_descriptor) +
				sizeof (struct mode_header) + page_size;
	nbytes = page_size;
	if ((mode_sense_buf = malloc((uint_t)nbytes)) == NULL) {
		err_print("cannot malloc %d bytes\n", nbytes);
		return (-1);
	}

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset(mode_sense_buf, 0, nbytes);
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = SCMD_MODE_SENSE;
	FORMG0COUNT(&cdb, (uchar_t)nbytes);
	cdb.cdb_opaque[2] = page_control | page_code;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	ucmd.uscsi_bufaddr = mode_sense_buf;
	ucmd.uscsi_buflen = nbytes;
	status = uscsi_cmd(fd, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);
	if (status) {
		if (option_msg) {
			err_print("Mode sense page 0x%x failed\n",
				page_code);
		}
		free(mode_sense_buf);
		return (-1);
	}

	/*
	 * Verify that the returned data looks reasonabled,
	 * find the actual page data, and copy it into the
	 * user's buffer.  Copy the mode_header and block_descriptor
	 * into the header structure, which can then be used to
	 * return the same data to the drive when issuing a mode select.
	 */
	hdr = (struct mode_header *)mode_sense_buf;
	(void) memset((caddr_t)header, 0, sizeof (struct scsi_ms_header));
	if (hdr->bdesc_length != sizeof (struct block_descriptor) &&
				hdr->bdesc_length != 0) {
		if (option_msg) {
			err_print("\
\nMode sense page 0x%x: block descriptor length %d incorrect\n",
				page_code, hdr->bdesc_length);
			if (diag_msg)
				dump("Mode sense: ", mode_sense_buf,
					nbytes, HEX_ONLY);
		}
		free(mode_sense_buf);
		return (-1);
	}
	(void) memcpy((caddr_t)header, mode_sense_buf,
		(int) (sizeof (struct mode_header) + hdr->bdesc_length));
	pg = (struct mode_page *)((ulong_t)mode_sense_buf +
		sizeof (struct mode_header) + hdr->bdesc_length);
	if (pg->code != page_code) {
		if (option_msg) {
			err_print("\
\nMode sense page 0x%x: incorrect page code 0x%x\n",
				page_code, pg->code);
			if (diag_msg)
				dump("Mode sense: ", mode_sense_buf,
					nbytes, HEX_ONLY);
		}
		free(mode_sense_buf);
		return (-1);
	}
	/*
	 * Accept up to "page_size" bytes of mode sense data.
	 * This allows us to accept both CCS and SCSI-2
	 * structures, as long as we request the greater
	 * of the two.
	 */
	maximum = page_size - sizeof (struct mode_page) - hdr->bdesc_length;
	if (((int)pg->length) > maximum) {
		if (option_msg) {
			err_print("\
Mode sense page 0x%x: incorrect page length %d - expected max %d\n",
				page_code, pg->length, maximum);
			if (diag_msg)
				dump("Mode sense: ", mode_sense_buf,
					nbytes, HEX_ONLY);
		}
		free(mode_sense_buf);
		return (-1);
	}

	(void) memcpy(page_data, (caddr_t)pg, MODESENSE_PAGE_LEN(pg));

	if (option_msg && diag_msg) {
		char *pc = find_string(page_control_strings, page_control);
		err_print("\nMode sense page 0x%x (%s):\n", page_code,
			pc != NULL ? pc : "");
		dump("header: ", (caddr_t)header,
			sizeof (struct scsi_ms_header), HEX_ONLY);
		dump("data:   ", page_data,
			MODESENSE_PAGE_LEN(pg), HEX_ONLY);
	}

	free(mode_sense_buf);
	return (0);
}


/*
 * Execute a uscsi mode select command.
 */
int
uscsi_mode_select(fd, page_code, options, page_data, page_size, header)
	int	fd;			/* file descriptor */
	int	page_code;		/* mode select page */
	int	options;		/* save page/page format */
	caddr_t	page_data;		/* place received data here */
	int	page_size;		/* size of page_data */
	struct	scsi_ms_header *header;	/* mode header/block descriptor */
{
	caddr_t				mode_select_buf;
	int				nbytes;
	struct uscsi_cmd		ucmd;
	union scsi_cdb			cdb;
	int				status;

	assert(((struct mode_page *)page_data)->ps == 0);
	assert(header->mode_header.length == 0);
	assert(header->mode_header.device_specific == 0);
	assert((options & ~(MODE_SELECT_SP|MODE_SELECT_PF)) == 0);

	/*
	 * Allocate a buffer for the mode select header and data
	 */
	nbytes = sizeof (struct block_descriptor) +
				sizeof (struct mode_header) + page_size;
	if ((mode_select_buf = malloc((uint_t)nbytes)) == NULL) {
		err_print("cannot malloc %d bytes\n", nbytes);
		return (-1);
	}

	/*
	 * Build the mode select data out of the header and page data
	 * This allows us to support devices which return either
	 * 0 or 1 block descriptors.
	 */
	(void) memset(mode_select_buf, 0, nbytes);
	nbytes = sizeof (struct mode_header);
	if (header->mode_header.bdesc_length ==
				sizeof (struct block_descriptor)) {
		nbytes += sizeof (struct block_descriptor);
	}

	/*
	 * Dump the structures if anyone's interested
	 */
	if (option_msg && diag_msg) {
		char *s;
		s = find_string(mode_select_strings,
			options & (MODE_SELECT_SP|MODE_SELECT_PF));
		err_print("\nMode select page 0x%x%s:\n", page_code,
			s != NULL ? s : "");
		dump("header: ", (caddr_t)header,
			nbytes, HEX_ONLY);
		dump("data:   ", (caddr_t)page_data,
			page_size, HEX_ONLY);
	}

	/*
	 * Fix the code for byte ordering
	 */

	switch (page_code) {
	case  DAD_MODE_ERR_RECOV:
		{
		struct mode_err_recov *pd;
		pd = (struct mode_err_recov *)(void *)page_data;
		pd->recovery_time_limit = BE_16(pd->recovery_time_limit);
		break;
		}
	case MODEPAGE_DISCO_RECO:
		{
		struct mode_disco_reco *pd;
		pd = (struct mode_disco_reco *)(void *)page_data;
		pd->bus_inactivity_limit = BE_16(pd->bus_inactivity_limit);
		pd->disconect_time_limit = BE_16(pd->disconect_time_limit);
		pd->connect_time_limit = BE_16(pd->connect_time_limit);
		pd->max_burst_size = BE_16(pd->max_burst_size);
		break;
		}
	case DAD_MODE_FORMAT:
		{
		struct mode_format *pd;
		pd = (struct mode_format *)(void *)page_data;
		pd->tracks_per_zone = BE_16(pd->tracks_per_zone);
		pd->alt_sect_zone = BE_16(pd->alt_sect_zone);
		pd->alt_tracks_zone = BE_16(pd->alt_tracks_zone);
		pd->alt_tracks_vol = BE_16(pd->alt_tracks_vol);
		pd->sect_track = BE_16(pd->sect_track);
		pd->data_bytes_sect = BE_16(pd->data_bytes_sect);
		pd->interleave = BE_16(pd->interleave);
		pd->track_skew = BE_16(pd->track_skew);
		pd->cylinder_skew = BE_16(pd->cylinder_skew);
		break;
		}
	case DAD_MODE_GEOMETRY:
		{
		struct mode_geometry *pd;
		pd = (struct mode_geometry *)(void *)page_data;
		pd->step_rate = BE_16(pd->step_rate);
		pd->rpm = BE_16(pd->rpm);
		break;
		}
	case DAD_MODE_CACHE:
		{
		struct mode_cache *pd;
		pd = (struct mode_cache *)(void *)page_data;
		pd->dis_prefetch_len = BE_16(pd->dis_prefetch_len);
		pd->min_prefetch = BE_16(pd->min_prefetch);
		pd->max_prefetch = BE_16(pd->max_prefetch);
		pd->prefetch_ceiling = BE_16(pd->prefetch_ceiling);
		break;
		}
	case MODEPAGE_PDEVICE:
		{
		struct mode_pdevice *pd;
		pd = (struct mode_pdevice *)(void *)page_data;
		pd->if_ident = BE_16(pd->if_ident);
		break;
		}
	case MODEPAGE_CTRL_MODE:
		{
		struct mode_control *pd;
		pd = (struct mode_control *)(void *)page_data;
		pd->ready_aen_holdoff = BE_16(pd->ready_aen_holdoff);
		break;
		}
	}

	/*
	 * Put the header and data together
	 */
	(void) memcpy(mode_select_buf, (caddr_t)header, nbytes);
	(void) memcpy(mode_select_buf + nbytes, page_data, page_size);
	nbytes += page_size;

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = SCMD_MODE_SELECT;
	FORMG0COUNT(&cdb, (uchar_t)nbytes);
	cdb.cdb_opaque[1] = (uchar_t)options;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	ucmd.uscsi_bufaddr = mode_select_buf;
	ucmd.uscsi_buflen = nbytes;
	status = uscsi_cmd(fd, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	if (status && option_msg) {
		err_print("Mode select page 0x%x failed\n", page_code);
	}

	free(mode_select_buf);
	return (status);
}


/*
 * Execute a uscsi inquiry command and return the
 * resulting data.
 */
int
uscsi_inquiry(fd, inqbuf, inqbufsiz)
	int		fd;
	caddr_t		inqbuf;
	int		inqbufsiz;
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	struct scsi_inquiry	*inq;
	int			n;
	int			status;

	assert(inqbufsiz >= sizeof (struct scsi_inquiry) &&
		inqbufsiz < 256);

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)inqbuf, 0, inqbufsiz);
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = SCMD_INQUIRY;
	FORMG0COUNT(&cdb, (uchar_t)inqbufsiz);
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	ucmd.uscsi_bufaddr = (caddr_t)inqbuf;
	ucmd.uscsi_buflen = inqbufsiz;
	status = uscsi_cmd(fd, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);
	if (status) {
		if (option_msg) {
			err_print("Inquiry failed\n");
		}
	} else if (option_msg && diag_msg) {
		/*
		 * Dump the inquiry data if anyone's interested
		 */
		inq = (struct scsi_inquiry *)inqbuf;
		n = (int)inq->inq_len + 4;
		n = min(n, inqbufsiz);
		err_print("Inquiry:\n");
		dump("", (caddr_t)inqbuf, n, HEX_ASCII);
	}
	return (status);
}


/*
 * Return the Read Capacity information
 */
int
uscsi_read_capacity(fd, capacity)
	int			fd;
	struct scsi_capacity_16	*capacity;
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	int			status;
	struct scsi_capacity	cap_old;

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)capacity, 0, sizeof (struct scsi_capacity_16));
	(void) memset((char *)&cap_old, 0, sizeof (struct scsi_capacity));
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = SCMD_READ_CAPACITY;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP1;
	ucmd.uscsi_bufaddr = (caddr_t)&cap_old;
	ucmd.uscsi_buflen = sizeof (struct scsi_capacity);
	status = uscsi_cmd(fd, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	if (cap_old.capacity == UINT_MAX32) {
		/*
		 * A capacity of 0xffffffff in response to a
		 * READ CAPACITY 10 indicates that the lun
		 * is too large to report the size in a 32 bit
		 * value, and a READ CAPACITY 16 is required
		 * to get the correct size.
		 */
		(void) memset((char *)&ucmd, 0, sizeof (ucmd));
		(void) memset((char *)&cdb, 0,
			sizeof (union scsi_cdb));

		ucmd.uscsi_cdb = (caddr_t)&cdb;
		ucmd.uscsi_cdblen = CDB_GROUP4;
		ucmd.uscsi_bufaddr = (caddr_t)capacity;
		ucmd.uscsi_buflen = sizeof (struct scsi_capacity_16);

		/*
		 * Read Capacity (16) is a Service Action In command.  One
		 * command byte (0x9E) is overloaded for multiple operations,
		 * with the second CDB byte specifying the desired operation
		 */
		cdb.scc_cmd = SCMD_SVC_ACTION_IN_G4;
		cdb.cdb_opaque[1] = SSVC_ACTION_READ_CAPACITY_G4;

		/*
		 * Fill in allocation length field
		 */
		cdb.cdb_opaque[10] =
		    (uchar_t)((ucmd.uscsi_buflen & 0xff000000) >> 24);
		cdb.cdb_opaque[11] =
		    (uchar_t)((ucmd.uscsi_buflen & 0x00ff0000) >> 16);
		cdb.cdb_opaque[12] =
		    (uchar_t)((ucmd.uscsi_buflen & 0x0000ff00) >> 8);
		cdb.cdb_opaque[13] =
		    (uchar_t)(ucmd.uscsi_buflen & 0x000000ff);

		status = uscsi_cmd(fd, &ucmd,
			(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

		capacity->sc_capacity = BE_64(capacity->sc_capacity);
		capacity->sc_lbasize = BE_32(capacity->sc_lbasize);
	} else {
		capacity->sc_capacity = (uint64_t)BE_32(cap_old.capacity);
		capacity->sc_lbasize = BE_32(cap_old.lbasize);
	}

	if (status) {
		if (option_msg) {
			/*
			 * Indicate which of the commands failed
			 */
			if (cdb.scc_cmd == SCMD_READ_CAPACITY) {
				err_print("Read capacity failed\n");
			} else {
				err_print("Read capacity 16 failed\n");
			}
		}
	} else if (option_msg && diag_msg) {
		/*
		 * Dump the capacity data if anyone's interested
		 */
		dump("Capacity: ", (caddr_t)capacity,
			sizeof (struct scsi_capacity_16), HEX_ONLY);
	}
	return (status);
}


/*
 * Reserve the current disk
 */
static int
uscsi_reserve_release(int fd, int cmd)
{
	int			status = 0;
#ifdef sparc
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = (cmd == SCMD_RESERVE) ? SCMD_RESERVE : SCMD_RELEASE;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	status = uscsi_cmd(fd, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	if (status) {
		/*
		 * Reserve/Release(6) failed.
		 * Try Reserve/Release(10) , if it succeeds then
		 * return success.
		 */
		(void) memset((char *)&ucmd, 0, sizeof (ucmd));
		(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
		ucmd.uscsi_cdb = (caddr_t)&cdb;
		cdb.scc_cmd = (cmd == SCMD_RESERVE) ?
			SCMD_RESERVE_G1 : SCMD_RELEASE_G1;
		ucmd.uscsi_cdblen = CDB_GROUP1;
		status = uscsi_cmd(fd, &ucmd,
			(option_msg && diag_msg) ? F_NORMAL : F_SILENT);
		if (status) {
			if (option_msg) {
			    err_print("%s failed\n", (cmd == SCMD_RESERVE) ?
				"Reserve" : "Release");
			}
		}
	}
#else /* not sparc */

#ifdef lint
	fd = fd;
	cmd = cmd;
#endif /* lint */

#endif /* not sparc */

	return (status);
}

int
scsi_dump_mode_sense_pages(page_control)
	int			page_control;
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	char			*msbuf;
	int			nbytes;
	char			*pc_str;
	int			status;
	struct mode_header	*mh;
	char			*p;
	struct mode_page	*mp;
	int			n;
	char			s[16];
	int			result = 0;

	pc_str = find_string(page_control_strings, page_control);

	/*
	 * Allocate memory for the mode sense buffer.
	 */
	nbytes = 255;
	msbuf = (char *)zalloc(nbytes);

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset(msbuf, 0, nbytes);
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	cdb.scc_cmd = SCMD_MODE_SENSE;
	FORMG0COUNT(&cdb, (uchar_t)nbytes);
	cdb.cdb_opaque[2] = page_control | 0x3f;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	ucmd.uscsi_bufaddr = msbuf;
	ucmd.uscsi_buflen = nbytes;
	status = uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);
	if (status) {
		err_print("\nMode sense page 0x3f (%s) failed\n",
			pc_str);
		result = 1;
	} else {
		err_print("\nMode sense pages (%s):\n", pc_str);
		mh = (struct mode_header *)msbuf;
		nbytes = mh->length - sizeof (struct mode_header) -
				mh->bdesc_length + 1;
		p = msbuf + sizeof (struct mode_header) +
			mh->bdesc_length;
		dump("         ", msbuf, sizeof (struct mode_header) +
			(int)mh->bdesc_length, HEX_ONLY);
		while (nbytes > 0) {
			mp = (struct mode_page *)p;
			n = mp->length + sizeof (struct mode_page);
			nbytes -= n;
			if (nbytes < 0)
				break;
			(void) sprintf(s, "   %3x:  ", mp->code);
			dump(s, p, n, HEX_ONLY);
			p += n;
		}
		if (nbytes < 0) {
			err_print("  Sense data formatted incorrectly:\n");
			dump("    ", msbuf, (int)mh->length+1, HEX_ONLY);
			result = 1;
		}
		err_print("\n");
	}

	free(msbuf);
	return (result);
}


static void
scsi_printerr(ucmd, rq, rqlen)
	struct uscsi_cmd		*ucmd;
	struct scsi_extended_sense	*rq;
	int				rqlen;
{
	diskaddr_t	blkno;
	struct scsi_descr_sense_hdr *sdsp =
	    (struct scsi_descr_sense_hdr *)rq;

	switch (rq->es_key) {
	case KEY_NO_SENSE:
		err_print("No sense error");
		break;
	case KEY_RECOVERABLE_ERROR:
		err_print("Recoverable error");
		break;
	case KEY_NOT_READY:
		err_print("Not ready error");
		break;
	case KEY_MEDIUM_ERROR:
		err_print("Medium error");
		break;
	case KEY_HARDWARE_ERROR:
		err_print("Hardware error");
		break;
	case KEY_ILLEGAL_REQUEST:
		err_print("Illegal request");
		break;
	case KEY_UNIT_ATTENTION:
		err_print("Unit attention error");
		break;
	case KEY_WRITE_PROTECT:
		err_print("Write protect error");
		break;
	case KEY_BLANK_CHECK:
		err_print("Blank check error");
		break;
	case KEY_VENDOR_UNIQUE:
		err_print("Vendor unique error");
		break;
	case KEY_COPY_ABORTED:
		err_print("Copy aborted error");
		break;
	case KEY_ABORTED_COMMAND:
		err_print("Aborted command");
		break;
	case KEY_EQUAL:
		err_print("Equal error");
		break;
	case KEY_VOLUME_OVERFLOW:
		err_print("Volume overflow");
		break;
	case KEY_MISCOMPARE:
		err_print("Miscompare error");
		break;
	case KEY_RESERVED:
		err_print("Reserved error");
		break;
	default:
		err_print("Unknown error");
		break;
	}

	err_print(" during %s", scsi_find_command_name(ucmd->uscsi_cdb[0]));

	/*
	 * Get asc, ascq and info field from sense data.  There are two
	 * possible formats (fixed sense data and descriptor sense data)
	 * depending on the value of es_code.
	 */
	switch (rq->es_code) {
	case CODE_FMT_DESCR_CURRENT:
	case CODE_FMT_DESCR_DEFERRED:
		blkno =
		    (diskaddr_t)scsi_extract_sense_info_descr(sdsp, rqlen);
		if (blkno != (diskaddr_t)-1) {
			err_print(": block %lld (0x%llx) (", blkno, blkno);
			pr_dblock(err_print, blkno);
			err_print(")");
		}

		err_print("\n");

		err_print("ASC: 0x%x   ASCQ: 0x%x\n",
		    sdsp->ds_add_code, sdsp->ds_qual_code);
		break;
	case CODE_FMT_FIXED_CURRENT:
	case CODE_FMT_FIXED_DEFERRED:
	default:
		if (rq->es_valid) {
			blkno = (rq->es_info_1 << 24) |
			    (rq->es_info_2 << 16) |
			    (rq->es_info_3 << 8) | rq->es_info_4;
			err_print(": block %lld (0x%llx) (", blkno, blkno);
			pr_dblock(err_print, blkno);
			err_print(")");
		}

		err_print("\n");

		if (rq->es_add_len >= 6) {
			err_print("ASC: 0x%x   ASCQ: 0x%x\n",
			    rq->es_add_code, rq->es_qual_code);
		}
		break;
	}

	if (option_msg && diag_msg) {
		if (rq->es_key == KEY_ILLEGAL_REQUEST) {
			dump("cmd:    ", (caddr_t)ucmd,
			    sizeof (struct uscsi_cmd), HEX_ONLY);
			dump("cdb:    ", (caddr_t)ucmd->uscsi_cdb,
			    ucmd->uscsi_cdblen, HEX_ONLY);
		}
		dump("sense:  ", (caddr_t)rq, rqlen, HEX_ONLY);
	}

	if (option_msg) {
		switch (rq->es_code) {
		case CODE_FMT_DESCR_CURRENT:
		case CODE_FMT_DESCR_DEFERRED:
			scsi_print_descr_sense(sdsp, rqlen);
			break;
		case CODE_FMT_FIXED_CURRENT:
		case CODE_FMT_FIXED_DEFERRED:
		default:
			scsi_print_extended_sense(rq, rqlen);
			break;
		}
	}
}

/*
 * Retrieve "information" field from descriptor format
 * sense data.  Iterates through each sense descriptor
 * looking for the information descriptor and returns
 * the information field from that descriptor.
 */
static diskaddr_t
scsi_extract_sense_info_descr(struct scsi_descr_sense_hdr *sdsp, int rqlen)
{
	diskaddr_t result;
	uint8_t *descr_offset;
	int valid_sense_length;
	struct scsi_information_sense_descr *isd;

	/*
	 * Initialize result to -1 indicating there is no information
	 * descriptor
	 */
	result = (diskaddr_t)-1;

	/*
	 * The first descriptor will immediately follow the header
	 */
	descr_offset = (uint8_t *)(sdsp+1); /* Pointer arithmetic */

	/*
	 * Calculate the amount of valid sense data
	 */
	valid_sense_length =
	    min((sizeof (struct scsi_descr_sense_hdr) +
	    sdsp->ds_addl_sense_length),
	    rqlen);

	/*
	 * Iterate through the list of descriptors, stopping when we
	 * run out of sense data
	 */
	while ((descr_offset + sizeof (struct scsi_information_sense_descr)) <=
	    (uint8_t *)sdsp + valid_sense_length) {
		/*
		 * Check if this is an information descriptor.  We can
		 * use the scsi_information_sense_descr structure as a
		 * template sense the first two fields are always the
		 * same
		 */
		isd = (struct scsi_information_sense_descr *)descr_offset;
		if (isd->isd_descr_type == DESCR_INFORMATION) {
			/*
			 * Found an information descriptor.  Copy the
			 * information field.  There will only be one
			 * information descriptor so we can stop looking.
			 */
			result =
			    (((diskaddr_t)isd->isd_information[0] << 56) |
				((diskaddr_t)isd->isd_information[1] << 48) |
				((diskaddr_t)isd->isd_information[2] << 40) |
				((diskaddr_t)isd->isd_information[3] << 32) |
				((diskaddr_t)isd->isd_information[4] << 24) |
				((diskaddr_t)isd->isd_information[5] << 16) |
				((diskaddr_t)isd->isd_information[6] << 8)  |
				((diskaddr_t)isd->isd_information[7]));
			break;
		}

		/*
		 * Get pointer to the next descriptor.  The "additional
		 * length" field holds the length of the descriptor except
		 * for the "type" and "additional length" fields, so
		 * we need to add 2 to get the total length.
		 */
		descr_offset += (isd->isd_addl_length + 2);
	}

	return (result);
}

/*
 * Return a pointer to a string telling us the name of the command.
 */
static char *
scsi_find_command_name(uint_t cmd)
{
	struct scsi_command_name *c;

	for (c = scsi_command_names; c->command != SCMD_UNKNOWN; c++)
		if (c->command == cmd)
			break;
	return (c->name);
}


/*
 * Return true if we support a particular mode page
 */
int
scsi_supported_page(int page) {
	return (page == 1 || page == 2 || page == 3 || page == 4 ||
		page == 8 || page == 0x38);
}


int
apply_chg_list(int pageno, int pagsiz, uchar_t *curbits,
		uchar_t *chgbits, struct chg_list *chglist)
{
	uchar_t		c;
	int		i;
	int		m;
	int		delta;
	int		changed = 0;

	while (chglist != NULL) {
		if (chglist->pageno == pageno &&
				chglist->byteno < pagsiz) {
			i = chglist->byteno;
			c = curbits[i];
			switch (chglist->mode) {
			case CHG_MODE_SET:
				c |= (uchar_t)chglist->value;
				break;
			case CHG_MODE_CLR:
				c &= (uchar_t)chglist->value;
				break;
			case CHG_MODE_ABS:
				c = (uchar_t)chglist->value;
				break;
			}
			/*
			 * Figure out which bits changed, and
			 * are marked as changeable.  If this
			 * result actually differs from the
			 * current value, update the current
			 * value, and note that a mode select
			 * should be done.
			 */
			delta = c ^ curbits[i];
			for (m = 0x01; m < 0x100; m <<= 1) {
				if ((delta & m) && (chgbits[i] & m)) {
					curbits[i] ^= m;
					changed = 1;
				}
			}
		}
		chglist = chglist->next;
	}

	return (changed);
}


/*
 * Return whether a given page is affected by an item on
 * the change list.
 */
static int
chg_list_affects_page(chglist, pageno)
	struct chg_list	*chglist;
	int		pageno;
{
	while (chglist != NULL) {
		if (chglist->pageno == pageno) {
			return (1);
		}
		chglist = chglist->next;
	}

	return (0);
}


/*
 * Labels for the various fields of the scsi_extended_sense structure
 */
static char *scsi_extended_sense_labels[] = {
	"Request sense valid:             ",
	"Error class and code:            ",
	"Segment number:                  ",
	"Filemark:                        ",
	"End-of-medium:                   ",
	"Incorrect length indicator:      ",
	"Sense key:                       ",
	"Information field:               ",
	"Additional sense length:         ",
	"Command-specific information:    ",
	"Additional sense code:           ",
	"Additional sense code qualifier: ",
	"Field replaceable unit code:     ",
	"Sense-key specific:              ",
	"Additional sense bytes:          "
};


/*
 * Display the full scsi_extended_sense as returned by the device
 */
static void
scsi_print_extended_sense(rq, rqlen)
	struct scsi_extended_sense	*rq;
	int				rqlen;
{
	char			**p;

	p = scsi_extended_sense_labels;
	if (rqlen < (sizeof (*rq) - 2) || !rq->es_valid) {
		/*
		 * target should be capable of returning at least 18
		 * bytes of data, i.e upto rq->es_skey_specific field.
		 * The additional sense bytes (2 or more ...) are optional.
		 */
		return;
	}

	fmt_print("\n%s%s\n", *p++, rq->es_valid ? "yes" : "no");
	fmt_print("%s0x%02x\n", *p++, (rq->es_class << 4) + rq->es_code);
	fmt_print("%s%d\n", *p++, rq->es_segnum);
	fmt_print("%s%s\n", *p++, rq->es_filmk ? "yes" : "no");
	fmt_print("%s%s\n", *p++, rq->es_eom ? "yes" : "no");
	fmt_print("%s%s\n", *p++, rq->es_ili ? "yes" : "no");
	fmt_print("%s%d\n", *p++, rq->es_key);

	fmt_print("%s0x%02x 0x%02x 0x%02x 0x%02x\n", *p++, rq->es_info_1,
		rq->es_info_2, rq->es_info_3, rq->es_info_4);
	fmt_print("%s%d\n", *p++, rq->es_add_len);
	fmt_print("%s0x%02x 0x%02x 0x%02x 0x%02x\n", *p++, rq->es_cmd_info[0],
		rq->es_cmd_info[1], rq->es_cmd_info[2], rq->es_cmd_info[3]);
	fmt_print("%s0x%02x = %d\n", *p++, rq->es_add_code, rq->es_add_code);
	fmt_print("%s0x%02x = %d\n", *p++, rq->es_qual_code, rq->es_qual_code);
	fmt_print("%s%d\n", *p++, rq->es_fru_code);
	fmt_print("%s0x%02x 0x%02x 0x%02x\n", *p++, rq->es_skey_specific[0],
		rq->es_skey_specific[1], rq->es_skey_specific[2]);
	if (rqlen >= sizeof (*rq)) {
		fmt_print("%s0x%02x 0x%02x%s\n", *p, rq->es_add_info[0],
		rq->es_add_info[1], (rqlen > sizeof (*rq)) ? " ..." : "");
	}

	fmt_print("\n");
}

/*
 * Labels for the various fields of the scsi_descr_sense_hdr structure
 */
static char *scsi_descr_sense_labels[] = {
	"Error class and code:            ",
	"Sense key:                       ",
	"Additional sense length:         ",
	"Additional sense code:           ",
	"Additional sense code qualifier: ",
	"Additional sense bytes:          "
};


/*
 * Display the full descriptor sense data as returned by the device
 */

static void
scsi_print_descr_sense(rq, rqlen)
	struct scsi_descr_sense_hdr	*rq;
	int				rqlen;
{
	char			**p;
	uint8_t			*descr_offset;
	int			valid_sense_length;
	struct scsi_information_sense_descr *isd;

	p = scsi_descr_sense_labels;
	if (rqlen < sizeof (struct scsi_descr_sense_hdr)) {
		/*
		 * target must return at least 8 bytes of data
		 */
		return;
	}

	/* Print descriptor sense header */
	fmt_print("%s0x%02x\n", *p++, (rq->ds_class << 4) + rq->ds_code);
	fmt_print("%s%d\n", *p++, rq->ds_key);

	fmt_print("%s%d\n", *p++, rq->ds_addl_sense_length);
	fmt_print("%s0x%02x = %d\n", *p++, rq->ds_add_code, rq->ds_add_code);
	fmt_print("%s0x%02x = %d\n", *p++, rq->ds_qual_code, rq->ds_qual_code);
	fmt_print("\n");

	/*
	 * Now print any sense descriptors.   The first descriptor will
	 * immediately follow the header
	 */
	descr_offset = (uint8_t *)(rq+1); /* Pointer arithmetic */

	/*
	 * Calculate the amount of valid sense data
	 */
	valid_sense_length =
	    min((sizeof (struct scsi_descr_sense_hdr) +
		rq->ds_addl_sense_length), rqlen);

	/*
	 * Iterate through the list of descriptors, stopping when we
	 * run out of sense data.  Descriptor format is:
	 *
	 * <Descriptor type> <Descriptor length> <Descriptor data> ...
	 */
	while ((descr_offset + *(descr_offset + 1)) <=
	    (uint8_t *)rq + valid_sense_length) {
		/*
		 * Determine descriptor type.  We can use the
		 * scsi_information_sense_descr structure as a
		 * template since the first two fields are always the
		 * same.
		 */
		isd = (struct scsi_information_sense_descr *)descr_offset;
		switch (isd->isd_descr_type) {
		case DESCR_INFORMATION: {
			uint64_t information;

			information =
			    (((uint64_t)isd->isd_information[0] << 56) |
				((uint64_t)isd->isd_information[1] << 48) |
				((uint64_t)isd->isd_information[2] << 40) |
				((uint64_t)isd->isd_information[3] << 32) |
				((uint64_t)isd->isd_information[4] << 24) |
				((uint64_t)isd->isd_information[5] << 16) |
				((uint64_t)isd->isd_information[6] << 8)  |
				((uint64_t)isd->isd_information[7]));
			fmt_print("Information field:               "
			    "%0llx\n", information);
			break;
		}
		case DESCR_COMMAND_SPECIFIC: {
			struct scsi_cmd_specific_sense_descr *c =
			    (struct scsi_cmd_specific_sense_descr *)isd;
			uint64_t cmd_specific;

			cmd_specific =
			    (((uint64_t)c->css_cmd_specific_info[0] << 56) |
				((uint64_t)c->css_cmd_specific_info[1] << 48) |
				((uint64_t)c->css_cmd_specific_info[2] << 40) |
				((uint64_t)c->css_cmd_specific_info[3] << 32) |
				((uint64_t)c->css_cmd_specific_info[4] << 24) |
				((uint64_t)c->css_cmd_specific_info[5] << 16) |
				((uint64_t)c->css_cmd_specific_info[6] << 8)  |
				((uint64_t)c->css_cmd_specific_info[7]));
			fmt_print("Command-specific information:    "
			    "%0llx\n", cmd_specific);
			break;
		}
		case DESCR_SENSE_KEY_SPECIFIC: {
			struct scsi_sk_specific_sense_descr *ssd =
			    (struct scsi_sk_specific_sense_descr *)isd;
			uint8_t *sk_spec_ptr = (uint8_t *)&ssd->sss_data;
			fmt_print("Sense-key specific:              "
			    "0x%02x 0x%02x 0x%02x\n", sk_spec_ptr[0],
			    sk_spec_ptr[1], sk_spec_ptr[2]);
			break;
		}
		case DESCR_FRU: {
			struct scsi_fru_sense_descr *fsd =
			    (struct scsi_fru_sense_descr *)isd;
			fmt_print("Field replaceable unit code:     "
			    "%d\n", fsd->fs_fru_code);
			break;
		}
		case DESCR_BLOCK_COMMANDS: {
			struct scsi_block_cmd_sense_descr *bsd =
			    (struct scsi_block_cmd_sense_descr *)isd;
			fmt_print("Incorrect length indicator:      "
			    "%s\n", bsd->bcs_ili ? "yes" : "no");
			break;
		}
		default:
			/* Ignore */
			break;
		}

		/*
		 * Get pointer to the next descriptor.  The "additional
		 * length" field holds the length of the descriptor except
		 * for the "type" and "additional length" fields, so
		 * we need to add 2 to get the total length.
		 */
		descr_offset += (isd->isd_addl_length + 2);
	}

	fmt_print("\n");
}

/*
 * Function checks if READ DEFECT DATA command is supported
 * on the current disk.
 */
static int
check_support_for_defects()
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	struct scsi_defect_list	def_list;
	struct scsi_defect_hdr	*hdr;
	int			status;
	char			rqbuf[255];
	struct scsi_extended_sense	*rq;

	hdr = (struct scsi_defect_hdr *)&def_list;

	/*
	 * First get length of list by asking for the header only.
	 */
	(void) memset((char *)&def_list, 0, sizeof (def_list));

	/*
	 * Build and execute the uscsi ioctl
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	(void) memset((char *)rqbuf, 0, 255);
	cdb.scc_cmd = SCMD_READ_DEFECT_LIST;
	FORMG1COUNT(&cdb, sizeof (struct scsi_defect_hdr));
	cdb.cdb_opaque[2] = DLD_MAN_DEF_LIST | DLD_BFI_FORMAT;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP1;
	ucmd.uscsi_bufaddr = (caddr_t)hdr;
	ucmd.uscsi_buflen = sizeof (struct scsi_defect_hdr);
	ucmd.uscsi_rqbuf = rqbuf;
	ucmd.uscsi_rqlen = sizeof (rqbuf);
	ucmd.uscsi_rqresid = sizeof (rqbuf);
	rq = (struct scsi_extended_sense *)ucmd.uscsi_rqbuf;

	status = uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);

	if (status != 0) {
		/*
		 * check if read_defect_list_is_supported.
		 */
		if (ucmd.uscsi_rqstatus == STATUS_GOOD &&
			rq->es_key == KEY_ILLEGAL_REQUEST &&
				rq->es_add_code == INVALID_OPCODE)
				return (0);
	}
	return (1);
}

/*
 * Format the disk, the whole disk, and nothing but the disk.
 * Function will be called only for disks
 * which do not support read defect list command.
 */
static int
scsi_format_without_defects()
{
	struct uscsi_cmd	ucmd;
	union scsi_cdb		cdb;
	struct scsi_defect_hdr	defect_hdr;
	int			status;

	/*
	 * Construct the uscsi format ioctl.
	 * Use fmtdata = 0 , indicating the no source of
	 * defects information is provided .
	 * Function will be called only for disks
	 * which do not support read defect list command.
	 */
	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));
	(void) memset((char *)&defect_hdr, 0, sizeof (defect_hdr));
	cdb.scc_cmd = SCMD_FORMAT;
	ucmd.uscsi_cdb = (caddr_t)&cdb;
	ucmd.uscsi_cdblen = CDB_GROUP0;
	ucmd.uscsi_bufaddr = (caddr_t)&defect_hdr;
	ucmd.uscsi_buflen = sizeof (defect_hdr);
	cdb.cdb_opaque[1] = 0;
	/*
	 * Issue the format ioctl
	 */
	status = uscsi_cmd(cur_file, &ucmd,
		(option_msg && diag_msg) ? F_NORMAL : F_SILENT);
	return (status);
}

/*
 * Name: test_until_ready
 *
 * Description: This function is used by scsi_format and
 *   scsi_format_raw to poll the device while the FORMAT
 *   UNIT cdb in in progress.
 *
 * Parameters:
 *   file descriptor to poll
 *
 * Returns:
 *   0 - good status
 *   !0 - bad status
 */
static int test_until_ready(int fd) {
	int				status = 1;
	struct uscsi_cmd		ucmd;
	union scsi_cdb			cdb;
	struct scsi_extended_sense	sense;
	time_t				start, check, time_left;
	uint16_t 			progress;
	int				hour, min, sec;

	(void) memset((char *)&ucmd, 0, sizeof (ucmd));
	(void) memset((char *)&cdb, 0, sizeof (union scsi_cdb));

	ucmd.uscsi_cdb		= (caddr_t)&cdb;
	ucmd.uscsi_cdblen	= CDB_GROUP0;
	ucmd.uscsi_rqbuf	= (caddr_t)&sense;
	ucmd.uscsi_rqlen	= SENSE_LEN;

	start = check = time((time_t *)0);

	/* Loop sending TEST UNIT READY until format is complete */
	while (status) {
		/* clear last request sense data */
		ucmd.uscsi_rqstatus	= 0;
		ucmd.uscsi_rqresid	= 0;
		(void) memset((char *)&sense, 0, SENSE_LEN);

		/* issue test unit ready */
		status = uscsi_cmd(fd, &ucmd, F_SILENT
				| F_RQENABLE);

		check = time((time_t *)0);

		/* If device returns not ready we get EIO */
		if (status != 0 && errno == EIO) {
			/* Check SKSV if progress indication is avail */
			if (sense.es_skey_specific[0] == 0x80) {
				/* Store progress indication */
				progress = ((uint16_t)sense.
					es_skey_specific[1]) << 8;
				progress |= (uint16_t)sense.
					es_skey_specific[2];
				progress = (uint16_t)(((float)progress /
					(float)PROGRESS_INDICATION_BASE)*100);

				fmt_print("\015");

				/*
				 * check to see if we can estimate
				 * time remaining  - wait until the format
				 * is at least 5 percent complete to avoid
				 * wildly-fluctuating time estimates
				 */
				if ((check - start) <= 0 || progress <= 5) {
					/* unable to estimate */
					fmt_print("  %02d%% complete ",
						progress);
				} else {
					/* display with estimated time */
					time_left = (time_t)(((float)(check
						- start) / (float)progress) *
						(float)(100 - progress));
					sec = time_left % 60;
					min = (time_left / 60) % 60;
					hour = time_left / 3600;

					fmt_print("  %02d%% complete "
						"(%02d:%02d:%02d remaining) ",
						progress, hour, min, sec);
				}
				/* flush or the screen will not update */
				(void) fflush(stdout);
			}
		} else {
			/* format not in progress */
			if (option_msg) {
			fmt_print("\nRequest Sense ASC=0x%x ASCQ=0x%x",
				sense.es_add_code, sense.es_qual_code);
			}
			break;
		}

		/* delay so we don't waste cpu time */
		(void) sleep(RETRY_DELAY);
	}
	return (status);
}