scsi_scan.c

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/*
 *  scsi_scan.c Copyright (C) 2000 Eric Youngdale
 *
 *  Bus scan logic.
 *
 *  This used to live in scsi.c, but that file was just a laundry basket
 *  full of misc stuff.  This got separated out in order to make things
 *  clearer.
 */

#define __NO_VERSION__
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>

#include <linux/blk.h>

#include "scsi.h"
#include "hosts.h"
#include "constants.h"

#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif

/* The following devices are known not to tolerate a lun != 0 scan for
 * one reason or another.  Some will respond to all luns, others will
 * lock up.
 */

#define BLIST_NOLUN     	0x001
#define BLIST_FORCELUN  	0x002
#define BLIST_BORKEN    	0x004
#define BLIST_KEY       	0x008
#define BLIST_SINGLELUN 	0x010
#define BLIST_NOTQ		0x020
#define BLIST_SPARSELUN 	0x040
#define BLIST_MAX5LUN		0x080
#define BLIST_ISDISK    	0x100
#define BLIST_ISROM     	0x200

static void print_inquiry(unsigned char *data);
static int scan_scsis_single(int channel, int dev, int lun, int *max_scsi_dev,
		int *sparse_lun, Scsi_Device ** SDpnt,
			     struct Scsi_Host *shpnt, char *scsi_result);

struct dev_info {
	const char *vendor;
	const char *model;
	const char *revision;	/* Latest revision known to be bad.  Not used yet */
	unsigned flags;
};

/*
 * This is what was previously known as the blacklist.  The concept
 * has been expanded so that we can specify other types of things we
 * need to be aware of.
 */
static struct dev_info device_list[] =
{
	{"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},	/* Locks up if polled for lun != 0 */
	{"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},	/* Locks up if polled for lun != 0 */
	{"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},	/* Locks up if polled for lun != 0 */
	{"DENON", "DRD-25X", "V", BLIST_NOLUN},			/* Locks up if probed for lun != 0 */
	{"HITACHI", "DK312C", "CM81", BLIST_NOLUN},		/* Responds to all lun - dtg */
	{"HITACHI", "DK314C", "CR21", BLIST_NOLUN},		/* responds to all lun */
	{"IMS", "CDD521/10", "2.06", BLIST_NOLUN},		/* Locks-up when LUN>0 polled. */
	{"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},		/* Locks-up when LUN>0 polled. */
	{"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},		/* Locks-up when LUN>0 polled. */
	{"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},		/* Locks up when LUN>0 polled */
	{"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},		/* Locks-up sometimes when LUN>0 polled. */
	{"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},		/* guess what? */
	{"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},	/*Responds to all lun */
	{"MICROP", "4110", "*", BLIST_NOTQ},			/* Buggy Tagged Queuing */
	{"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},	/* Locks-up when LUN>0 polled. */
	{"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},		/* Responds to all lun */
	{"RODIME", "RO3000S", "2.33", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},		/* causes failed REQUEST SENSE on lun 1
								 * for aha152x controller, which causes
								 * SCSI code to reset bus.*/
	{"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},		/* causes failed REQUEST SENSE on lun 1
								 * for aha152x controller, which causes
								 * SCSI code to reset bus.*/
	{"SEAGATE", "ST296", "921", BLIST_NOLUN},		/* Responds to all lun */
	{"SEAGATE", "ST1581", "6538", BLIST_NOLUN},		/* Responds to all lun */
	{"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},	
	{"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
	{"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
	{"SONY", "CD-ROM CDU-8012", "*", BLIST_NOLUN},
	{"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},		/* causes failed REQUEST SENSE on lun 1
								 * for seagate controller, which causes
								 * SCSI code to reset bus.*/
	{"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},	/* Responds to all lun */
	{"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},		/* causes failed REQUEST SENSE on lun 1
								 * for seagate controller, which causes
								 * SCSI code to reset bus.*/
	{"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},		/* Locks sometimes if polled for lun != 0 */
	{"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},		/* Locks sometimes if polled for lun != 0 */
	{"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},	/* Locks up when polled for lun != 0 */
	{"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"SANKYO", "CP525", "6.64", BLIST_NOLUN},		/* causes failed REQ SENSE, extra reset */
	{"HP", "C1750A", "3226", BLIST_NOLUN},			/* scanjet iic */
	{"HP", "C1790A", "", BLIST_NOLUN},			/* scanjet iip */
	{"HP", "C2500A", "", BLIST_NOLUN},			/* scanjet iicx */
	{"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},		/* Locks up if polled for lun != 0  
								 * extra reset */
	{"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},		/* Locks up if polled for lun != 0 */
	{"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},	/* Locks up if polled for lun != 0 */
	{"RELISYS", "Scorpio", "*", BLIST_NOLUN},		/* responds to all LUN */
	{"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},	/* responds to all LUN */

/*
 * Other types of devices that have special flags.
 */
	{"SONY", "CD-ROM CDU-8001", "*", BLIST_BORKEN},
	{"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
	{"IOMEGA", "Io20S         *F", "*", BLIST_KEY},
	{"INSITE", "Floptical   F*8I", "*", BLIST_KEY},
	{"INSITE", "I325VM", "*", BLIST_KEY},
	{"LASOUND","CDX7405","3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
	{"NRC", "MBR-7", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"NRC", "MBR-7.4", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"REGAL", "CDC-4X", "*", BLIST_MAX5LUN | BLIST_SINGLELUN},
	{"NAKAMICH", "MJ-4.8S", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"NAKAMICH", "MJ-5.16S", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-600", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-602X", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"PIONEER", "CD-ROM DRM-604X", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"EMULEX", "MD21/S2     ESDI", "*", BLIST_SINGLELUN},
	{"CANON", "IPUBJD", "*", BLIST_SPARSELUN},
	{"nCipher", "Fastness Crypto", "*", BLIST_FORCELUN},
	{"DEC","HSG80","*", BLIST_FORCELUN},
	{"COMPAQ","LOGICAL VOLUME","*", BLIST_FORCELUN},
	{"NEC", "PD-1 ODX654P", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"MATSHITA", "PD-1", "*", BLIST_FORCELUN | BLIST_SINGLELUN},
	{"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
 	{"TOSHIBA","CDROM","*", BLIST_ISROM},
	{"MegaRAID", "LD", "*", BLIST_FORCELUN},
	{"DGC",  "RAID",      "*", BLIST_SPARSELUN}, // Dell PV 650F (tgt @ LUN 0)
	{"DGC",  "DISK",      "*", BLIST_SPARSELUN}, // Dell PV 650F (no tgt @ LUN 0) 
	{"DELL", "PV530F",    "*", BLIST_SPARSELUN}, // Dell PV 530F
	{"SONY", "TSL",       "*", BLIST_FORCELUN},  // DDS3 & DDS4 autoloaders
	{"DELL", "PERCRAID", "*", BLIST_FORCELUN},
	{"HP", "NetRAID-4M", "*", BLIST_FORCELUN},

	/*
	 * Must be at end of list...
	 */
	{NULL, NULL, NULL}
};

#ifdef CONFIG_SCSI_MULTI_LUN
static int max_scsi_luns = 8;
#else
static int max_scsi_luns = 1;
#endif

#ifdef MODULE

MODULE_PARM(max_scsi_luns, "i");
MODULE_PARM_DESC(max_scsi_luns, "last scsi LUN (should be between 1 and 8)");

#else

static int __init scsi_luns_setup(char *str)
{
	int tmp;

	if (get_option(&str, &tmp) == 1) {
		max_scsi_luns = tmp;
		return 1;
	} else {
		printk("scsi_luns_setup : usage max_scsi_luns=n "
		       "(n should be between 1 and 8)\n");
		return 0;
	}
}

__setup("max_scsi_luns=", scsi_luns_setup);

#endif

static void print_inquiry(unsigned char *data)
{
	int i;

	printk("  Vendor: ");
	for (i = 8; i < 16; i++) {
		if (data[i] >= 0x20 && i < data[4] + 5)
			printk("%c", data[i]);
		else
			printk(" ");
	}

	printk("  Model: ");
	for (i = 16; i < 32; i++) {
		if (data[i] >= 0x20 && i < data[4] + 5)
			printk("%c", data[i]);
		else
			printk(" ");
	}

	printk("  Rev: ");
	for (i = 32; i < 36; i++) {
		if (data[i] >= 0x20 && i < data[4] + 5)
			printk("%c", data[i]);
		else
			printk(" ");
	}

	printk("\n");

	i = data[0] & 0x1f;

	printk("  Type:   %s ",
	       i < MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] : "Unknown          ");
	printk("                 ANSI SCSI revision: %02x", data[2] & 0x07);
	if ((data[2] & 0x07) == 1 && (data[3] & 0x0f) == 1)
		printk(" CCS\n");
	else
		printk("\n");
}

static int get_device_flags(unsigned char *response_data)
{
	int i = 0;
	unsigned char *pnt;
	for (i = 0; 1; i++) {
		if (device_list[i].vendor == NULL)
			return 0;
		pnt = &response_data[8];
		while (*pnt && *pnt == ' ')
			pnt++;
		if (memcmp(device_list[i].vendor, pnt,
			   strlen(device_list[i].vendor)))
			continue;
		pnt = &response_data[16];
		while (*pnt && *pnt == ' ')
			pnt++;
		if (memcmp(device_list[i].model, pnt,
			   strlen(device_list[i].model)))
			continue;
		return device_list[i].flags;
	}
	return 0;
}

/*
 *  Detecting SCSI devices :
 *  We scan all present host adapter's busses,  from ID 0 to ID (max_id).
 *  We use the INQUIRY command, determine device type, and pass the ID /
 *  lun address of all sequential devices to the tape driver, all random
 *  devices to the disk driver.
 */
void scan_scsis(struct Scsi_Host *shpnt,
		       uint hardcoded,
		       uint hchannel,
		       uint hid,
		       uint hlun)
{
	uint channel;
	int dev;
	int lun;
	int max_dev_lun;
	unsigned char *scsi_result;
	unsigned char scsi_result0[256];
	Scsi_Device *SDpnt;
	Scsi_Device *SDtail;
	int sparse_lun;

	scsi_result = NULL;

	SDpnt = (Scsi_Device *) kmalloc(sizeof(Scsi_Device),
					GFP_ATOMIC);
	if (SDpnt) {
		memset(SDpnt, 0, sizeof(Scsi_Device));
		/*
		 * Register the queue for the device.  All I/O requests will
		 * come in through here.  We also need to register a pointer to
		 * ourselves, since the queue handler won't know what device
		 * the queue actually represents.   We could look it up, but it
		 * is pointless work.
		 */
		scsi_initialize_queue(SDpnt, shpnt);
		SDpnt->request_queue.queuedata = (void *) SDpnt;
		/* Make sure we have something that is valid for DMA purposes */
		scsi_result = ((!shpnt->unchecked_isa_dma)
			       ? &scsi_result0[0] : kmalloc(512, GFP_DMA));
	}

	if (scsi_result == NULL) {
		printk("Unable to obtain scsi_result buffer\n");
		goto leave;
	}
	/*
	 * We must chain ourself in the host_queue, so commands can time out 
	 */
	SDpnt->queue_depth = 1;
	SDpnt->host = shpnt;
	SDpnt->online = TRUE;

	initialize_merge_fn(SDpnt);

        /*
         * Initialize the object that we will use to wait for command blocks.
         */
	init_waitqueue_head(&SDpnt->scpnt_wait);

	/*
	 * Next, hook the device to the host in question.
	 */
	SDpnt->prev = NULL;
	SDpnt->next = NULL;
	if (shpnt->host_queue != NULL) {
		SDtail = shpnt->host_queue;
		while (SDtail->next != NULL)
			SDtail = SDtail->next;

		SDtail->next = SDpnt;
		SDpnt->prev = SDtail;
	} else {
		shpnt->host_queue = SDpnt;
	}

	/*
	 * We need to increment the counter for this one device so we can track when
	 * things are quiet.
	 */
	if (hardcoded == 1) {
		Scsi_Device *oldSDpnt = SDpnt;
		struct Scsi_Device_Template *sdtpnt;
		channel = hchannel;
		if (channel > shpnt->max_channel)
			goto leave;
		dev = hid;
		if (dev >= shpnt->max_id)
			goto leave;
		lun = hlun;
		if (lun >= shpnt->max_lun)
			goto leave;
		scan_scsis_single(channel, dev, lun, &max_dev_lun, &sparse_lun,
				  &SDpnt, shpnt, scsi_result);
		if (SDpnt != oldSDpnt) {

			/* it could happen the blockdevice hasn't yet been inited */
			/* queue_depth() moved from scsi_proc_info() so that
			   it is called before scsi_build_commandblocks() */
			if (shpnt->select_queue_depths != NULL)
				(shpnt->select_queue_depths)(shpnt,
							     shpnt->host_queue);

			for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next)
				if (sdtpnt->init && sdtpnt->dev_noticed)
					(*sdtpnt->init) ();

			for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next) {
				if (sdtpnt->attach) {
					(*sdtpnt->attach) (oldSDpnt);
					if (oldSDpnt->attached) {
						scsi_build_commandblocks(oldSDpnt);
						if (0 == oldSDpnt->has_cmdblocks) {
							printk("scan_scsis: DANGER, no command blocks\n");
							/* What to do now ?? */
						}
					}
				}
			}
			scsi_resize_dma_pool();

			for (sdtpnt = scsi_devicelist; sdtpnt; sdtpnt = sdtpnt->next) {
				if (sdtpnt->finish && sdtpnt->nr_dev) {
					(*sdtpnt->finish) ();
				}
			}
		}
	} else {
		/* Actual LUN. PC ordering is 0->n IBM/spec ordering is n->0 */
		int order_dev;

		for (channel = 0; channel <= shpnt->max_channel; channel++) {
			for (dev = 0; dev < shpnt->max_id; ++dev) {
				if (shpnt->reverse_ordering)
					/* Shift to scanning 15,14,13... or 7,6,5,4, */
					order_dev = shpnt->max_id - dev - 1;
				else
					order_dev = dev;