scsi.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static  char    *sccsid = "@(#)scsi.c	4.8  (ULTRIX)        1/22/91";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1984,86,87,88,89 by		*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any	other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived	from  software	received  from	the	*
 *   University    of	California,   Berkeley,   and	from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is	subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or	reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/************************************************************************
 *
 * scsi.c	22-Jun-89
 *
 * VAX SCSI device driver (common routines)
 *
 * Modification history:
 *
 *   09-Jan-91	Robin Miller
 *	On fixed length block tapes (QIC), if the byte count isn't modulo
 *	the block size or if the byte count is greater than 16KB, return
 *	the error code EINVAL ("invalid argument") instead of ENXIO ("no
 *	such device or address") to avoid confusion.  This error occurs
 *	frequently when using the 'dd' utility if the 'sync=conv' option
 *	is omitted to pad output records.
 *
 *   27-Nov-90	Robin Miller
 *	Merged in Bill Dallas fix which resets the szflags field before
 *	retrying the command.  Previously if the device had disconnected
 *	with a check condition, the DMA disconnect flag (SZ_DMA_DISCON)
 *	was left set causing the wrong DMA count to be setup which later
 *	panic'ed the system.
 *
 *   26-Nov-90	Robin Miller
 *	o  Added function sz_cdb_length() to calculate and return the
 *	   Command Descriptor Block length.  The length is calculated
 *	   using the group code of the command.
 *	o  Removed '#ifdef FORMAT' conditionalization, since the special
 *	   interface is used to implement CD-ROM Audio commands.
 *	o  Added support for 10-byte read/write CDB's.  If the LBA is
 *	   too large for 6-byte CDB, setup and send a 10-byte CDB.
 *
 * 09-Nov-90	Robin Miller
 *	Changed logic associated with checking of End Of Media (EOM) and
 *	File Mark (FM) bits in the sense data for the TLZ04 (RDAT).  The
 *	RDAT sets both of these bits on reads past LEOT (early warning).
 *	Previously, we only checked and returned EOM status and ignored
 *	the FM bit.  This broke the restore utility since it expected an
 *	end of file indication (FM returns count of 0) to prompt for the
 *	next volume.
 *
 * 21-Sept-90	Bill Dallas
 *	Added fixes for correct handling of flags for tapes. This
 *	includes tpmark, dev_cse, and dev_shrtrec. All fixes are
 * 	in the state machine (state SZ_BEGIN). Please see the 
 *	comments in the code for a complete description.
 * 
 *   15-Aug-89	Robin Miller
 *	o  Added errlog cases for RRD42, RX26, and RZ25 devices.
 *
 *	o  Modified the szerror() routine so "Device Not Ready" errors
 *	   get sent to the error logger.  This error logging is only
 *	   done if the current command isn't a Test Unit Ready (SZ_TUR)
 *	   so checks in device open routines don't get logged as errors.
 *	   Previously ejecting a tape or a CD during an command didn't
 *	   get logged, only EIO was returned to the program.
 *
 *	o  Fixed problem logging errors for CD-ROM devices.  The
 *	   scsi_logerr() routine was not checking for CD-ROM devices
 *	   when setting up the class type field, so it was set to
 *	   undefined (EL_UNDEF).  The 'uerf' utility would then report
 *	   "OS EVENT TYPE 65535" and not display the error information.
 *	   The CD-ROM errors are now treated the same as disk errors.
 *
 * 30-Jul-90	Bill Dallas   
 *	Added fixed block tape units tape mark handling.
 *	This included a new falg in sc_category_flags called
 *	TPMARK_PENDING
 *
 * 16-Jul-90  Janet Schank
 *      Added errlog cases for the RZ23L, RZ24, RZ57, and TZ05.
 *
 * 05-Jul-90
 *	Added support for the TZK10 and the new scsi device option 
 *	table.
 *
 * 23-Feb-90 -- sekhar
 *      Merged Joe Martin's fix for 3.1 cld. When copying user PTEs,
 *      check for page crossing and reevaluate vtopte.
 *
 *   29-Jan-90  Janet Schank
 *      Added errlog case for TLZ04 (RDAT).
 *
 *   13-Nov-89  Janet L. Schank / JAG / Art Zemon
 *      The RDAT drive was setting both the filemark and ili bits 
 *      in the request sense data when a filemark is read.  Changed
 *      the checks for these bits in szerror to only set one error
 *      flag depending on these bits.  Added the function get_scsiid.
 *      Added TZ05 support
 *
 *   04-Oct-89	Fred Canter
 *	Bug fix. Added newline to resetting SCSI bus message.
 *	Added sector number to error log packet for disk errors.
 *	Use sz_sbtol() to extract infobytes from sense data.
 *
 *   18-Aug-89  Janet L. Schank
 *      The sz_timetable is now using SZ_TIMETBL_SZ as its size.
 *
 *   14-Aug-89	Fred Canter
 *	Enabled binary error logging (sz_log_errors = 1).
 *	Bug fix: not setting registers valid flag for SII.
 *
 *   25-Jul-89	Fred Canter
 *	Separate SCSI device name defines from MSCP/TMSCP names.
 *
 *   23-Jul-89	Fred Caner
 *	Convert DBBR printfs to error log calls.
 *	RX33 support.
 *
 *   22-Jul-89	Fred Canter
 *	Always log "resetting bus" to console.
 *
 *   16-Jul-89	Fred Canter
 *	Do mode sense to get disk geometry.
 *
 *   15-Jul-89	Fred Canter
 *	Add flag to control logging of DATAPROTECT errors (sz_log_we_errors).
 *
 *   14-Jul-89	Fred Canter
 *	Merged Dynamic BBR and error log changes.
 *
 *   24-Jun-89	Fred Canter
 *	Modify scsi_logerr to log to console if error cannot be logged.
 *
 *   22-Jun-89	Fred Canter
 *	Save a copy of the current CDB for the error log.
 *	Save status byte for current command for error log.
 *
 *   22-Jun-89	John A. Gallant
 *	Moved the completion handling of a bp, from the statemachine to the
 *	completion handler for the drivers.  Included support for the read/
 *	write long commands.  Added the scsi bytes to long conversion routine.
 *
 *   17-Jun-89	Fred Canter
 *	Added scsi_logerr() routine for binary error logging support.
 *
 *   11-Jun-89	Fred Canter
 *	Save additional sense code in sz_softc so we can tell when the
 *	floppy media has been changed. Hooks for softpc.
 *
 *   24-May-89	Fred Canter
 *	Changes to match the new, more general rzdisk utility.
 *	Changed the mode select data structures so an address and
 *	length are passed with the ioctl. This allows pages to be
 *	added to rzdisk without requiring a kernel rebuild.
 *
 *   22-May-89	Fred Canter
 *	Fixed a bug in the code which copies the data back to the user
 *	on a unrecoverable data error. The code was completely wrong and
 *	would cause a panic on a medium error (such as reading a unformatted
 *	SCSI floppy).
 *
 *   17-May-89	Fred Canter
 *	Bug fix (same as stc.c). Back/forward space thru a file mark
 *	should fail but wasn't.
 *
 *   24-Apr-89	Fred Canter
 *	Added support for the RX23s SCSI floppy.
 *
 *   06-Apr-89	Fred Canter
 *	Added TZxx (EXABYTE) support:
 *		Don't send VU bits with mode select (modsel.pll = 12).
 *		Handle target returning busy status (EXABYTE does this).
 *
 *	Fixed a bug in the tape short record read code (DEC_SHRTREC).
 *	The tapex -s test failed because the driver did not copy
 *	the data back to the users' buffer on a short record read.
 *
 *	Added b_comand to replace b_command for local command buffers.
 *	Use b_gid instead of b_resid to store command.
 *	No longer need to restore bp->b_command on error retry.
 *
 *	Don't retry any tape commands (position lost).
 *
 *	Added the capability to do extended mode select for TZxx tapes.
 *
 *   22-Feb-89	Alan Frechette
 *	Fixed the command timeout table "sz_timetable[]" used for the SII.
 *	Increased some of the timeout values and got rid of the pseudo-op
 *	definitions that were not needed.
 *
 *   11-Feb-89	Fred Canter
 *	Fixed yet another bug with 64KB transfers. Use blkcpy instead
 *	of bcopy (bcopy max byte count is 64KB -1 ) for copying
 *	data to and from the users' buffer.
 *	Added function header comments to each routine.
 *
 *    5-Feb-89	Fred Canter
 *	Remove rz_max_xfer, cz_max_xfer, and tz_max_xfer.
 *
 *    2-Jan-89	Fred Canter
 *	Modify szerror() to print "error (retrying...)" instead of
 *	"soft error" on errors which will be retried.
 *	Cleanup debug code in szerror().
 *	Add code to handle short records on read (thanks JAG).
 *
 *   28-Dec-88	Fred Canter
 *	Call szerror() for certain tzcommands so the reason they
 *	failed gets entered into the error log.
 *
 *   20-Dec-88	Alan Frechette
 *	Fixed an "rzdisk" related bug. If an "rzdisk" command gets
 *	a check condition an the sense key is SZ_NOSENSE then return
 *	good status.
 *
 *   17-Dec-88	Fred Canter
 *	Added pseudo commands to resolve the conflict between
 *	SZ_UNLOAD and SZ_SSUNIT both being opcode 0x1b.
 *
 *   15-Dec-88	Alan Frechette
 *	Modified the state machine to copy data back to the user
 *	on UNRECOVERABLE data errors. The data copied back to the
 *	user consists of the data starting from the beginning of
 *	the disk transfer upto and including the bad block. This
 *	is needed mainly for "rzdisk" when REASSIGNING bad blocks.
 *
 *   08-Dec-88	Alan Frechette
 *	Set the "pf" bit when you issue a MODE SELECT to the CDROM.
 *	Needed so "rzdisk" will work.
 *
 *   06-Dec-88	Alan Frechette
 *	Added the printing of the sector number and partition to the
 *	error logger for RECOVERABLE and UNRECOVERABLE data errors.
 *	
 *   04-Dec-88	Fred Canter
 *	Retry MEDIUMERR on RZ disks only (for rzdisk consistency).
 *
 *   03-Dec-88	Fred Canter
 *	Changed sz_se_rstop from 1 to 0.
 *	Retry hardware error sense key. Report retries as soft error
 *	but last retry as hard error.
 * 
 *   03-Nov-88	Alan Frechette
 *	Added in support for disk maintainence. Added the commands
 *	FORMAT UNIT, REASSIGN BLOCK, READ DEFECT DATA and VERIFY DATA.
 *	Made changes to MODE SENSE and MODE SELECT. Figured out a better
 *	way to determine length of a SCSI command in "sz_bldpkt()".
 *	Initialize "sc->sc_c_status[targid]" in "sz_start()". Fixed
 *	the command timeout table "sz_timetable[]" which is now used
 *	by the SII for scsi command timeouts.
 *
 *	Handle the case of retying a command due to a BUS DEVICE RESET
 *	or an ABORT from the SII driver. The flag value "SZ_RETRY_CMD"
 *	in "sc->sc_szflags[targid]" handles this condition in "szerror()".
 *
 *   16-Oct-88 -- Fred Canter
 *	Clean up code and comments.
 *	Move #deine SZDEBUG to scsireg.h. Add RZxx (non-DEC) support.
 *	Fixed a bug which caused tape commands to fail if the
 *	bus was busy (see comment in SZ_SP_START:). Fixed a bug
 *	which caused MEDIUM errors not to be logged.
 *
 *   28-Sep-88 -- Fred Canter
 *	Clean up comments. clean up code and comments for the device
 *	failed to select timeout.
 *
 *   13-Sep-88 -- Fred Canter
 *	Do less retries (devices do retries).
 *
 *   21-Aug-88 -- Fred Canter
 *	Improved device failed to select error handling. Spin for a
 *	short time. Use a timeout for the remaining time.
 *	Removed unused sz_reset routine. Real one now in scsi_5380.c.
 *	Added support for bus reset.
 *
 *   18-Aug-88 -- Fred Canter
 *	Pass -1 not 0 to sz_start() to start next I/O (fix target ID 0).
 *	Add sz_em_print to control extended message debug printout.
 *	Fix driver not always seeing MICROPOLIS B drive by asserting
 *	ATTN before droping ACK on last byte of extended message.
 *	Add SHMEM code to bcopy (pte mapping) to fix BAR 435.
 *	Changed select enable back to the original way.
 *	Try interrupt instead of spin on phase change (doesn't work yet).
 *	Fix driver bug which made it think targets were skipping
 *	the status command (sometimes), data in was eating status byte.
 *
 *	Merge 5380 and SII drivers.
 *
 *   08-Aug-88 -- Alan Frechette
 *	Merged in all of the SII portion of this driver. Modified
 *	the driver to execute the correct code paths whether using
 *	the SII chip or the NCR 5380 chip. Fixed a few bugs in the
 *	SII code, made changes to the SII code based on Fred's new
 *	driver and tried to improve performance.
 *
 *   08-Aug-88 -- Fred Canter
 *	Removed stray interrupt code (can recover from last delta).
 *	In szprobe, reset bus if BSY/SEL wedged after inquiry.
 *	Clean out old debug and hltcod code.
 *	Fix for parity errors caused by PARCK enabled during arbitration.
 *
 *   28-Jul-88 -- Fred Canter
 *	Removed old code which supported RRD40 as device 'cz' (now 'rz).
 *	Fixed background timer to work with 2nd SCSI controller.
 *	Program around TZ30 holding BSY true after command complete.
 *	Added extended message support so driver will work with
 *	yet another version of the RZ55.
 *	Removed ond sz_timer code.
 *	Clean up sz_flags for much improved reselect timeout handling.
 *	Removed old disconnect timeout code from background timer.
 *
 *   18-Jul-88 -- Fred Canter
 *	Removed all #ifdef CZ code (can recover it from last delta).
 *	Fix background timer for 2nd SCSI controller.
 *	Added work around for TZ30 holding bus after command complete.
 *	Fixed MICROPOLIS B RZ55 support (handle extended message).
 *
 *   16-Jul-88 -- Fred Canter
 *	Handle unit attn condition (media change).
 *	Convert sz_active from 0-7 to ID bit position.
 *	Improve reselect timeout handling (CDROM hacks).
 *	Enable parity checking at all times.
 *	Fixed a bug in rzioctl which prevented the driver from
 *	ever setting the default partitions once the disk had
 *	a partition table on it.
 *	Changed the RRD40 name from cz to rz (CDROM is a disk).
 *	Lots of code cleanup.
 *
 *   28-Jun-88 -- Fred Canter
 *	Several driver improvements and code cleanup:
 *		Restructure for better ??command() handling.
 *		Deal with unit attn (TZ cartridge change).
 *		Read system's (initiator) bus ID from NVR.
 *		Fix DEV_WRITTEN flag handling.
 *		Background timer to catch lost interrupts
 *		and reselect timeouts.
 *
 *   18-Jun-88 -- Fred Canter
 *	Added RZ55 support and fixed a bug in partition table code.
 *	Fixed a bug in request sense status which caused intalls to fail.
 *	Improved (but not fixed) lost interrupt and reselect timeout
 *	handling (massive code changes).
 *
 *   07-Jun-88 -- Fred Canter
 *	Bug fixes for finder opening every possible device in the world.
 *
 *   06-Jun-88 -- Fred Canter
 *	First submit to V2.4 pool (sccs create). Much cleanup done.
 *	Much more needed. Driver functioning well enough to support
 *	building a kit for testing.
 *
 *   23-Apr-88 -- Fred Canter
 *	A RED LETTER DAY for sure!
 *	Fixed "most" of the problems which were preventing the
 *	driver from running multiple devices concurrently.
 *
 *   22-Apr-88 -- Fred Canter
 *	Prototype driver now functioning reasonably.
 *	Much cleanup done, much more needed.
 *
 *    1-Mar-88 -- Fred Canter
 *	Created the prototype SCSI driver from the VAXstar
 *	TZK50 driver (stc.c).
 *
 ***********************************************************************/

/***********************************************************************
 * TODO:
 *
 *  1.	Tape record size limited to a maximum of 16KB.
 *
 ***********************************************************************
 */
  
#include "../data/scsi_data.c"
#include "scsi_debug.h"

extern char cvqmsi[] [512*NBPG];
extern char cvqmsirb[];
extern char szbufmap[];

extern	int sz_retries[];	/* retry counter */
int sz_max_numof_fills = SZ_DEFAULT_FILLS; /* Maximum number of fills to write*/
					   /* in order to try to keep the tape*/
					   /* drive streaming.		      */

int	sz_timer1();
int	sz_timer2();
int	szprobe(), szslave(), szattach(), szintr(), sz_start(),	szerror(), sz_scsistart(), sz_reset();
int 	sii_probe(), sii_intr(), sii_scsistart(), sii_reset();

u_short	szstd[] = { 0 };

/*
 *	The ud_name entry was changed from "sz" to "rz"
 *	to make the dump and swap on boot code happy.
 *	They should get the name from the ubdinit structure (ui_devname).
 *	The ud_name should really be "scsi".
 *
 *	It appears the dump code was fixed on or about 6/5/88.
 *	However, the code works as is and there not time to change it.
 */
struct	uba_driver scsidriver = { szprobe, szslave, szattach, sz_start,
				szstd, "rz", szdinfo, "scsi", szminfo,
				0 };

struct	uba_driver siidriver = { sii_probe, szslave, szattach, sz_start,
				szstd, "rz", szdinfo, "sii", szminfo,
				0 };

extern struct nexus nexus[];


extern int sz_unit_rcvdiag[];	/* If zero, need unit's selftest status */

/*
 * Unit on line flag. Set to one if the
 * device is on-line. Set to zero on any unit
 * attention condition.
 */
extern int sz_unit_online[];

/*
 * The following table is the timeout value for each command assuming that
 * the timer is set to go off every 30 seconds. This table is now used by
 * the SII driver.
 *