[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / device_handler / scsi_dh_emc.c

/*
 * Target driver for EMC CLARiiON AX/CX-series hardware.
 * Based on code from Lars Marowsky-Bree <lmb@suse.de>
 * and Ed Goggin <egoggin@emc.com>.
 *
 * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
 * Copyright (C) 2006 Mike Christie
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dh.h>
#include <scsi/scsi_device.h>

#define CLARIION_NAME			"emc"

#define CLARIION_TRESPASS_PAGE		0x22
#define CLARIION_BUFFER_SIZE		0xFC
#define CLARIION_TIMEOUT		(60 * HZ)
#define CLARIION_RETRIES		3
#define CLARIION_UNBOUND_LU		-1
#define CLARIION_SP_A			0
#define CLARIION_SP_B			1

/* Flags */
#define CLARIION_SHORT_TRESPASS		1
#define CLARIION_HONOR_RESERVATIONS	2

/* LUN states */
#define CLARIION_LUN_UNINITIALIZED	-1
#define CLARIION_LUN_UNBOUND		0
#define CLARIION_LUN_BOUND		1
#define CLARIION_LUN_OWNED		2

static unsigned char long_trespass[] = {
	0, 0, 0, 0, 0, 0, 0, 0,
	CLARIION_TRESPASS_PAGE,	/* Page code */
	0x09,			/* Page length - 2 */
	0x01,			/* Trespass code */
	0xff, 0xff,		/* Trespass target */
	0, 0, 0, 0, 0, 0	/* Reserved bytes / unknown */
};

static unsigned char short_trespass[] = {
	0, 0, 0, 0,
	CLARIION_TRESPASS_PAGE,	/* Page code */
	0x02,			/* Page length - 2 */
	0x01,			/* Trespass code */
	0xff,			/* Trespass target */
};

static const char * lun_state[] =
{
    "not bound",
    "bound",
    "owned",
};

struct clariion_dh_data {
	/*
	 * Flags:
	 *  CLARIION_SHORT_TRESPASS
	 * Use short trespass command (FC-series) or the long version
	 * (default for AX/CX CLARiiON arrays).
	 *
	 *  CLARIION_HONOR_RESERVATIONS
	 * Whether or not (default) to honor SCSI reservations when
	 * initiating a switch-over.
	 */
	unsigned flags;
	/*
	 * I/O buffer for both MODE_SELECT and INQUIRY commands.
	 */
	unsigned char buffer[CLARIION_BUFFER_SIZE];
	/*
	 * SCSI sense buffer for commands -- assumes serial issuance
	 * and completion sequence of all commands for same multipath.
	 */
	unsigned char sense[SCSI_SENSE_BUFFERSIZE];
	unsigned int senselen;
	/*
	 * LUN state
	 */
	int lun_state;
	/*
	 * SP Port number
	 */
	int port;
	/*
	 * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
	 * path's mapped LUN
	 */
	int default_sp;
	/*
	 * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
	 * path's mapped LUN
	 */
	int current_sp;
};

static inline struct clariion_dh_data
			*get_clariion_data(struct scsi_device *sdev)
{
	struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
	BUG_ON(scsi_dh_data == NULL);
	return ((struct clariion_dh_data *) scsi_dh_data->buf);
}

/*
 * Parse MODE_SELECT cmd reply.
 */
static int trespass_endio(struct scsi_device *sdev, char *sense)
{
	int err = SCSI_DH_IO;
	struct scsi_sense_hdr sshdr;

	if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
		sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
			    "0x%2x, 0x%2x while sending CLARiiON trespass "
			    "command.\n", CLARIION_NAME, sshdr.sense_key,
			    sshdr.asc, sshdr.ascq);

		if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
		     (sshdr.ascq == 0x00)) {
			/*
			 * Array based copy in progress -- do not send
			 * mode_select or copy will be aborted mid-stream.
			 */
			sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
				    "progress while sending CLARiiON trespass "
				    "command.\n", CLARIION_NAME);
			err = SCSI_DH_DEV_TEMP_BUSY;
		} else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
			    (sshdr.ascq == 0x03)) {
			/*
			 * LUN Not Ready - Manual Intervention Required
			 * indicates in-progress ucode upgrade (NDU).
			 */
			sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
				    "ucode upgrade NDU operation while sending "
				    "CLARiiON trespass command.\n", CLARIION_NAME);
			err = SCSI_DH_DEV_TEMP_BUSY;
		} else
			err = SCSI_DH_DEV_FAILED;
	} else {
		sdev_printk(KERN_INFO, sdev,
			    "%s: failed to send MODE SELECT, no sense available\n",
			    CLARIION_NAME);
	}
	return err;
}

static int parse_sp_info_reply(struct scsi_device *sdev,
			       struct clariion_dh_data *csdev)
{
	int err = SCSI_DH_OK;

	/* check for in-progress ucode upgrade (NDU) */
	if (csdev->buffer[48] != 0) {
		sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
			    "ucode upgrade NDU operation while finding "
			    "current active SP.", CLARIION_NAME);
		err = SCSI_DH_DEV_TEMP_BUSY;
		goto out;
	}
	if (csdev->buffer[4] > 2) {
		/* Invalid buffer format */
		sdev_printk(KERN_NOTICE, sdev,
			    "%s: invalid VPD page 0xC0 format\n",
			    CLARIION_NAME);
		err = SCSI_DH_NOSYS;
		goto out;
	}
	switch (csdev->buffer[28] & 0x0f) {
	case 6:
		sdev_printk(KERN_NOTICE, sdev,
			    "%s: ALUA failover mode detected\n",
			    CLARIION_NAME);
		break;
	case 4:
		/* Linux failover */
		break;
	default:
		sdev_printk(KERN_WARNING, sdev,
			    "%s: Invalid failover mode %d\n",
			    CLARIION_NAME, csdev->buffer[28] & 0x0f);
		err = SCSI_DH_NOSYS;
		goto out;
	}

	csdev->default_sp = csdev->buffer[5];
	csdev->lun_state = csdev->buffer[4];
	csdev->current_sp = csdev->buffer[8];
	csdev->port = csdev->buffer[7];

out:
	return err;
}

#define emc_default_str "FC (Legacy)"

static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
{
	unsigned char len = buffer[4] + 5;
	char *sp_model = NULL;
	unsigned char sp_len, serial_len;

	if (len < 160) {
		sdev_printk(KERN_WARNING, sdev,
			    "%s: Invalid information section length %d\n",
			    CLARIION_NAME, len);
		/* Check for old FC arrays */
		if (!strncmp(buffer + 8, "DGC", 3)) {
			/* Old FC array, not supporting extended information */
			sp_model = emc_default_str;
		}
		goto out;
	}

	/*
	 * Parse extended information for SP model number
	 */
	serial_len = buffer[160];
	if (serial_len == 0 || serial_len + 161 > len) {
		sdev_printk(KERN_WARNING, sdev,
			    "%s: Invalid array serial number length %d\n",
			    CLARIION_NAME, serial_len);
		goto out;
	}
	sp_len = buffer[99];
	if (sp_len == 0 || serial_len + sp_len + 161 > len) {
		sdev_printk(KERN_WARNING, sdev,
			    "%s: Invalid model number length %d\n",
			    CLARIION_NAME, sp_len);
		goto out;
	}
	sp_model = &buffer[serial_len + 161];
	/* Strip whitespace at the end */
	while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
		sp_len--;

	sp_model[sp_len] = '\0';

out:
	return sp_model;
}

/*
 * Get block request for REQ_BLOCK_PC command issued to path.  Currently
 * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
 *
 * Uses data and sense buffers in hardware handler context structure and
 * assumes serial servicing of commands, both issuance and completion.
 */
static struct request *get_req(struct scsi_device *sdev, int cmd,
				unsigned char *buffer)
{
	struct request *rq;
	int len = 0;

	rq = blk_get_request(sdev->request_queue,
			(cmd == MODE_SELECT) ? WRITE : READ, GFP_NOIO);
	if (!rq) {
		sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
		return NULL;
	}

	rq->cmd_len = COMMAND_SIZE(cmd);
	rq->cmd[0] = cmd;

	switch (cmd) {
	case MODE_SELECT:
		len = sizeof(short_trespass);
		rq->cmd_flags |= REQ_RW;
		rq->cmd[1] = 0x10;
		break;
	case MODE_SELECT_10:
		len = sizeof(long_trespass);
		rq->cmd_flags |= REQ_RW;
		rq->cmd[1] = 0x10;
		break;
	case INQUIRY:
		len = CLARIION_BUFFER_SIZE;
		memset(buffer, 0, len);
		break;
	default:
		BUG_ON(1);
		break;
	}

	rq->cmd[4] = len;
	rq->cmd_type = REQ_TYPE_BLOCK_PC;
	rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
			 REQ_FAILFAST_DRIVER;
	rq->timeout = CLARIION_TIMEOUT;
	rq->retries = CLARIION_RETRIES;

	if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
		blk_put_request(rq);
		return NULL;
	}

	return rq;
}

static int send_inquiry_cmd(struct scsi_device *sdev, int page,
			    struct clariion_dh_data *csdev)
{
	struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
	int err;

	if (!rq)
		return SCSI_DH_RES_TEMP_UNAVAIL;

	rq->sense = csdev->sense;
	memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
	rq->sense_len = csdev->senselen = 0;

	rq->cmd[0] = INQUIRY;
	if (page != 0) {
		rq->cmd[1] = 1;
		rq->cmd[2] = page;
	}
	err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
	if (err == -EIO) {
		sdev_printk(KERN_INFO, sdev,
			    "%s: failed to send %s INQUIRY: %x\n",
			    CLARIION_NAME, page?"EVPD":"standard",
			    rq->errors);
		csdev->senselen = rq->sense_len;
		err = SCSI_DH_IO;
	}

	blk_put_request(rq);

	return err;
}

static int send_trespass_cmd(struct scsi_device *sdev,
			    struct clariion_dh_data *csdev)
{
	struct request *rq;
	unsigned char *page22;
	int err, len, cmd;

	if (csdev->flags & CLARIION_SHORT_TRESPASS) {
		page22 = short_trespass;
		if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
			/* Set Honor Reservations bit */
			page22[6] |= 0x80;
		len = sizeof(short_trespass);
		cmd = MODE_SELECT;
	} else {
		page22 = long_trespass;
		if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
			/* Set Honor Reservations bit */
			page22[10] |= 0x80;
		len = sizeof(long_trespass);
		cmd = MODE_SELECT_10;
	}
	BUG_ON((len > CLARIION_BUFFER_SIZE));
	memcpy(csdev->buffer, page22, len);

	rq = get_req(sdev, cmd, csdev->buffer);
	if (!rq)
		return SCSI_DH_RES_TEMP_UNAVAIL;

	rq->sense = csdev->sense;
	memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
	rq->sense_len = csdev->senselen = 0;

	err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
	if (err == -EIO) {
		if (rq->sense_len) {
			err = trespass_endio(sdev, csdev->sense);
		} else {
			sdev_printk(KERN_INFO, sdev,
				    "%s: failed to send MODE SELECT: %x\n",
				    CLARIION_NAME, rq->errors);
		}
	}

	blk_put_request(rq);

	return err;
}

static int clariion_check_sense(struct scsi_device *sdev,
				struct scsi_sense_hdr *sense_hdr)
{
	switch (sense_hdr->sense_key) {
	case NOT_READY:
		if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
			/*
			 * LUN Not Ready - Manual Intervention Required
			 * indicates this is a passive path.
			 *
			 * FIXME: However, if this is seen and EVPD C0
			 * indicates that this is due to a NDU in
			 * progress, we should set FAIL_PATH too.
			 * This indicates we might have to do a SCSI
			 * inquiry in the end_io path. Ugh.
			 *
			 * Can return FAILED only when we want the error
			 * recovery process to kick in.
			 */
			return SUCCESS;
		break;
	case ILLEGAL_REQUEST:
		if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
			/*
			 * An array based copy is in progress. Do not
			 * fail the path, do not bypass to another PG,
			 * do not retry. Fail the IO immediately.
			 * (Actually this is the same conclusion as in
			 * the default handler, but lets make sure.)
			 *
			 * Can return FAILED only when we want the error
			 * recovery process to kick in.
			 */
			return SUCCESS;
		break;
	case UNIT_ATTENTION:
		if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
			/*
			 * Unit Attention Code. This is the first IO
			 * to the new path, so just retry.
			 */
			return ADD_TO_MLQUEUE;
		break;
	}

	return SCSI_RETURN_NOT_HANDLED;
}

static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
{
	struct clariion_dh_data *h = get_clariion_data(sdev);
	int ret = BLKPREP_OK;

	if (h->lun_state != CLARIION_LUN_OWNED) {
		ret = BLKPREP_KILL;
		req->cmd_flags |= REQ_QUIET;
	}
	return ret;

}

static int clariion_std_inquiry(struct scsi_device *sdev,
				struct clariion_dh_data *csdev)
{
	int err;
	char *sp_model;

	err = send_inquiry_cmd(sdev, 0, csdev);
	if (err != SCSI_DH_OK && csdev->senselen) {
		struct scsi_sense_hdr sshdr;

		if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
					 &sshdr)) {
			sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
				    "%02x/%02x/%02x\n", CLARIION_NAME,
				    sshdr.sense_key, sshdr.asc, sshdr.ascq);
		}
		err = SCSI_DH_IO;
		goto out;
	}

	sp_model = parse_sp_model(sdev, csdev->buffer);
	if (!sp_model) {
		err = SCSI_DH_DEV_UNSUPP;
		goto out;
	}

	/*
	 * FC Series arrays do not support long trespass
	 */
	if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
		csdev->flags |= CLARIION_SHORT_TRESPASS;

	sdev_printk(KERN_INFO, sdev,
		    "%s: detected Clariion %s, flags %x\n",
		    CLARIION_NAME, sp_model, csdev->flags);
out:
	return err;
}

static int clariion_send_inquiry(struct scsi_device *sdev,
				 struct clariion_dh_data *csdev)
{
	int err, retry = CLARIION_RETRIES;

retry:
	err = send_inquiry_cmd(sdev, 0xC0, csdev);
	if (err != SCSI_DH_OK && csdev->senselen) {
		struct scsi_sense_hdr sshdr;

		err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
					   &sshdr);
		if (!err)
			return SCSI_DH_IO;

		err = clariion_check_sense(sdev, &sshdr);
		if (retry > 0 && err == ADD_TO_MLQUEUE) {
			retry--;
			goto retry;
		}
		sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
			    "%02x/%02x/%02x\n", CLARIION_NAME,
			      sshdr.sense_key, sshdr.asc, sshdr.ascq);
		err = SCSI_DH_IO;
	} else {
		err = parse_sp_info_reply(sdev, csdev);
	}
	return err;
}

static int clariion_activate(struct scsi_device *sdev)
{
	struct clariion_dh_data *csdev = get_clariion_data(sdev);
	int result;

	result = clariion_send_inquiry(sdev, csdev);
	if (result != SCSI_DH_OK)
		goto done;

	if (csdev->lun_state == CLARIION_LUN_OWNED)
		goto done;

	result = send_trespass_cmd(sdev, csdev);
	if (result != SCSI_DH_OK)
		goto done;
	sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
		    CLARIION_NAME,
		    csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );

	/* Update status */
	result = clariion_send_inquiry(sdev, csdev);
	if (result != SCSI_DH_OK)
		goto done;

done:
	sdev_printk(KERN_INFO, sdev,
		    "%s: at SP %c Port %d (%s, default SP %c)\n",
		    CLARIION_NAME, csdev->current_sp + 'A',
		    csdev->port, lun_state[csdev->lun_state],
		    csdev->default_sp + 'A');

	return result;
}

static const struct scsi_dh_devlist clariion_dev_list[] = {
	{"DGC", "RAID"},
	{"DGC", "DISK"},
	{"DGC", "VRAID"},
	{NULL, NULL},
};

static int clariion_bus_attach(struct scsi_device *sdev);
static void clariion_bus_detach(struct scsi_device *sdev);

static struct scsi_device_handler clariion_dh = {
	.name		= CLARIION_NAME,
	.module		= THIS_MODULE,
	.devlist	= clariion_dev_list,
	.attach		= clariion_bus_attach,
	.detach		= clariion_bus_detach,
	.check_sense	= clariion_check_sense,
	.activate	= clariion_activate,
	.prep_fn	= clariion_prep_fn,
};

/*
 * TODO: need some interface so we can set trespass values
 */
static int clariion_bus_attach(struct scsi_device *sdev)
{
	struct scsi_dh_data *scsi_dh_data;
	struct clariion_dh_data *h;
	unsigned long flags;
	int err;

	scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
			       + sizeof(*h) , GFP_KERNEL);
	if (!scsi_dh_data) {
		sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
			    CLARIION_NAME);
		return -ENOMEM;
	}

	scsi_dh_data->scsi_dh = &clariion_dh;
	h = (struct clariion_dh_data *) scsi_dh_data->buf;
	h->lun_state = CLARIION_LUN_UNINITIALIZED;
	h->default_sp = CLARIION_UNBOUND_LU;
	h->current_sp = CLARIION_UNBOUND_LU;

	err = clariion_std_inquiry(sdev, h);
	if (err != SCSI_DH_OK)
		goto failed;

	err = clariion_send_inquiry(sdev, h);
	if (err != SCSI_DH_OK)
		goto failed;

	if (!try_module_get(THIS_MODULE))
		goto failed;

	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
	sdev->scsi_dh_data = scsi_dh_data;
	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);

	sdev_printk(KERN_INFO, sdev,
		    "%s: connected to SP %c Port %d (%s, default SP %c)\n",
		    CLARIION_NAME, h->current_sp + 'A',
		    h->port, lun_state[h->lun_state],
		    h->default_sp + 'A');

	return 0;

failed:
	kfree(scsi_dh_data);
	sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
		    CLARIION_NAME);
	return -EINVAL;
}

static void clariion_bus_detach(struct scsi_device *sdev)
{
	struct scsi_dh_data *scsi_dh_data;
	unsigned long flags;

	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
	scsi_dh_data = sdev->scsi_dh_data;
	sdev->scsi_dh_data = NULL;
	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);

	sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
		    CLARIION_NAME);

	kfree(scsi_dh_data);
	module_put(THIS_MODULE);
}

static int __init clariion_init(void)
{
	int r;

	r = scsi_register_device_handler(&clariion_dh);
	if (r != 0)
		printk(KERN_ERR "%s: Failed to register scsi device handler.",
			CLARIION_NAME);
	return r;
}

static void __exit clariion_exit(void)
{
	scsi_unregister_device_handler(&clariion_dh);
}

module_init(clariion_init);
module_exit(clariion_exit);

MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
5e7dccad CS	1	/*
	2	* Target driver for EMC CLARiiON AX/CX-series hardware.
	3	* Based on code from Lars Marowsky-Bree <lmb@suse.de>
	4	* and Ed Goggin <egoggin@emc.com>.
	5	*
	6	* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
	7	* Copyright (C) 2006 Mike Christie
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2, or (at your option)
	12	* any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; see the file COPYING. If not, write to
	21	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23	#include <scsi/scsi.h>
	24	#include <scsi/scsi_eh.h>
	25	#include <scsi/scsi_dh.h>
	26	#include <scsi/scsi_device.h>
	27
b6ff1b14	28	#define CLARIION_NAME "emc"
5e7dccad CS	29
5e7dccad CS	30	#define CLARIION_TRESPASS_PAGE 0x22
b6ff1b14	31	#define CLARIION_BUFFER_SIZE 0xFC
5e7dccad CS	32	#define CLARIION_TIMEOUT (60 * HZ)
	33	#define CLARIION_RETRIES 3
	34	#define CLARIION_UNBOUND_LU -1
b6ff1b14 HR	35	#define CLARIION_SP_A 0
b6ff1b14 HR	36	#define CLARIION_SP_B 1
5e7dccad	37
b6ff1b14 HR	38	/* Flags */
	39	#define CLARIION_SHORT_TRESPASS 1
	40	#define CLARIION_HONOR_RESERVATIONS 2
5e7dccad	41
b6ff1b14 HR	42	/* LUN states */
	43	#define CLARIION_LUN_UNINITIALIZED -1
	44	#define CLARIION_LUN_UNBOUND 0
	45	#define CLARIION_LUN_BOUND 1
	46	#define CLARIION_LUN_OWNED 2
	47
	48	static unsigned char long_trespass[] = {
	49	0, 0, 0, 0, 0, 0, 0, 0,
5e7dccad CS	50	CLARIION_TRESPASS_PAGE, /* Page code */
5e7dccad CS	51	0x09, /* Page length - 2 */
b6ff1b14	52	0x01, /* Trespass code */
5e7dccad CS	53	0xff, 0xff, /* Trespass target */
	54	0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
	55	};
	56
	57	static unsigned char short_trespass[] = {
	58	0, 0, 0, 0,
	59	CLARIION_TRESPASS_PAGE, /* Page code */
	60	0x02, /* Page length - 2 */
b6ff1b14	61	0x01, /* Trespass code */
5e7dccad CS	62	0xff, /* Trespass target */
	63	};
	64
b6ff1b14 HR	65	static const char * lun_state[] =
	66	{
	67	"not bound",
	68	"bound",
	69	"owned",
5e7dccad CS	70	};
	71
	72	struct clariion_dh_data {
	73	/*
b6ff1b14 HR	74	* Flags:
b6ff1b14 HR	75	* CLARIION_SHORT_TRESPASS
5e7dccad CS	76	* Use short trespass command (FC-series) or the long version
5e7dccad CS	77	* (default for AX/CX CLARiiON arrays).
b6ff1b14 HR	78	*
b6ff1b14 HR	79	* CLARIION_HONOR_RESERVATIONS
5e7dccad CS	80	* Whether or not (default) to honor SCSI reservations when
	81	* initiating a switch-over.
	82	*/
b6ff1b14 HR	83	unsigned flags;
	84	/*
	85	* I/O buffer for both MODE_SELECT and INQUIRY commands.
	86	*/
7ae628d9	87	unsigned char buffer[CLARIION_BUFFER_SIZE];
5e7dccad CS	88	/*
	89	* SCSI sense buffer for commands -- assumes serial issuance
	90	* and completion sequence of all commands for same multipath.
	91	*/
	92	unsigned char sense[SCSI_SENSE_BUFFERSIZE];
b6ff1b14 HR	93	unsigned int senselen;
	94	/*
	95	* LUN state
	96	*/
	97	int lun_state;
	98	/*
	99	* SP Port number
	100	*/
	101	int port;
	102	/*
	103	* which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
	104	* path's mapped LUN
	105	*/
5e7dccad	106	int default_sp;
b6ff1b14 HR	107	/*
	108	* which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
	109	* path's mapped LUN
	110	*/
5e7dccad CS	111	int current_sp;
	112	};
	113
	114	static inline struct clariion_dh_data
	115	get_clariion_data(struct scsi_device sdev)
	116	{
	117	struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
	118	BUG_ON(scsi_dh_data == NULL);
	119	return ((struct clariion_dh_data *) scsi_dh_data->buf);
	120	}
	121
	122	/*
	123	* Parse MODE_SELECT cmd reply.
	124	*/
b6ff1b14	125	static int trespass_endio(struct scsi_device sdev, char sense)
5e7dccad	126	{
b6ff1b14	127	int err = SCSI_DH_IO;
5e7dccad	128	struct scsi_sense_hdr sshdr;
5e7dccad	129
b6ff1b14 HR	130	if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) {
b6ff1b14 HR	131	sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
5e7dccad	132	"0x%2x, 0x%2x while sending CLARiiON trespass "
b6ff1b14 HR	133	"command.\n", CLARIION_NAME, sshdr.sense_key,
b6ff1b14 HR	134	sshdr.asc, sshdr.ascq);
5e7dccad CS	135
	136	if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) &&
	137	(sshdr.ascq == 0x00)) {
	138	/*
	139	* Array based copy in progress -- do not send
	140	* mode_select or copy will be aborted mid-stream.
	141	*/
b6ff1b14	142	sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
5e7dccad	143	"progress while sending CLARiiON trespass "
b6ff1b14	144	"command.\n", CLARIION_NAME);
5e7dccad CS	145	err = SCSI_DH_DEV_TEMP_BUSY;
	146	} else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) &&
	147	(sshdr.ascq == 0x03)) {
	148	/*
	149	* LUN Not Ready - Manual Intervention Required
	150	* indicates in-progress ucode upgrade (NDU).
	151	*/
b6ff1b14	152	sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
5e7dccad	153	"ucode upgrade NDU operation while sending "
b6ff1b14	154	"CLARiiON trespass command.\n", CLARIION_NAME);
5e7dccad CS	155	err = SCSI_DH_DEV_TEMP_BUSY;
	156	} else
	157	err = SCSI_DH_DEV_FAILED;
b6ff1b14 HR	158	} else {
	159	sdev_printk(KERN_INFO, sdev,
	160	"%s: failed to send MODE SELECT, no sense available\n",
	161	CLARIION_NAME);
5e7dccad	162	}
5e7dccad CS	163	return err;
	164	}
	165
b6ff1b14 HR	166	static int parse_sp_info_reply(struct scsi_device *sdev,
b6ff1b14 HR	167	struct clariion_dh_data *csdev)
5e7dccad CS	168	{
5e7dccad CS	169	int err = SCSI_DH_OK;
5e7dccad	170
b6ff1b14 HR	171	/* check for in-progress ucode upgrade (NDU) */
	172	if (csdev->buffer[48] != 0) {
	173	sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
	174	"ucode upgrade NDU operation while finding "
	175	"current active SP.", CLARIION_NAME);
	176	err = SCSI_DH_DEV_TEMP_BUSY;
	177	goto out;
	178	}
7ae628d9	179	if (csdev->buffer[4] > 2) {
b6ff1b14 HR	180	/* Invalid buffer format */
	181	sdev_printk(KERN_NOTICE, sdev,
	182	"%s: invalid VPD page 0xC0 format\n",
	183	CLARIION_NAME);
	184	err = SCSI_DH_NOSYS;
	185	goto out;
	186	}
	187	switch (csdev->buffer[28] & 0x0f) {
	188	case 6:
	189	sdev_printk(KERN_NOTICE, sdev,
	190	"%s: ALUA failover mode detected\n",
	191	CLARIION_NAME);
	192	break;
	193	case 4:
	194	/* Linux failover */
	195	break;
	196	default:
	197	sdev_printk(KERN_WARNING, sdev,
	198	"%s: Invalid failover mode %d\n",
	199	CLARIION_NAME, csdev->buffer[28] & 0x0f);
	200	err = SCSI_DH_NOSYS;
	201	goto out;
5e7dccad CS	202	}
5e7dccad CS	203
b6ff1b14 HR	204	csdev->default_sp = csdev->buffer[5];
	205	csdev->lun_state = csdev->buffer[4];
	206	csdev->current_sp = csdev->buffer[8];
	207	csdev->port = csdev->buffer[7];
	208
	209	out:
5e7dccad CS	210	return err;
	211	}
	212
b6ff1b14 HR	213	#define emc_default_str "FC (Legacy)"
	214
	215	static char * parse_sp_model(struct scsi_device sdev, unsigned char buffer)
5e7dccad	216	{
b6ff1b14 HR	217	unsigned char len = buffer[4] + 5;
	218	char *sp_model = NULL;
	219	unsigned char sp_len, serial_len;
	220
	221	if (len < 160) {
	222	sdev_printk(KERN_WARNING, sdev,
	223	"%s: Invalid information section length %d\n",
	224	CLARIION_NAME, len);
	225	/* Check for old FC arrays */
	226	if (!strncmp(buffer + 8, "DGC", 3)) {
	227	/* Old FC array, not supporting extended information */
	228	sp_model = emc_default_str;
	229	}
	230	goto out;
	231	}
5e7dccad	232
b6ff1b14 HR	233	/*
	234	* Parse extended information for SP model number
	235	*/
	236	serial_len = buffer[160];
	237	if (serial_len == 0 \|\| serial_len + 161 > len) {
	238	sdev_printk(KERN_WARNING, sdev,
	239	"%s: Invalid array serial number length %d\n",
	240	CLARIION_NAME, serial_len);
	241	goto out;
	242	}
	243	sp_len = buffer[99];
	244	if (sp_len == 0 \|\| serial_len + sp_len + 161 > len) {
	245	sdev_printk(KERN_WARNING, sdev,
	246	"%s: Invalid model number length %d\n",
	247	CLARIION_NAME, sp_len);
	248	goto out;
	249	}
	250	sp_model = &buffer[serial_len + 161];
	251	/* Strip whitespace at the end */
	252	while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
	253	sp_len--;
5e7dccad	254
b6ff1b14	255	sp_model[sp_len] = '\0';
5e7dccad	256
b6ff1b14 HR	257	out:
b6ff1b14 HR	258	return sp_model;
5e7dccad CS	259	}
	260
	261	/*
765cbc6d HR	262	* Get block request for REQ_BLOCK_PC command issued to path. Currently
	263	* limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
	264	*
	265	* Uses data and sense buffers in hardware handler context structure and
	266	* assumes serial servicing of commands, both issuance and completion.
	267	*/
b6ff1b14 HR	268	static struct request get_req(struct scsi_device sdev, int cmd,
b6ff1b14 HR	269	unsigned char *buffer)
5e7dccad	270	{
5e7dccad	271	struct request *rq;
5e7dccad CS	272	int len = 0;
	273
	274	rq = blk_get_request(sdev->request_queue,
b6ff1b14	275	(cmd == MODE_SELECT) ? WRITE : READ, GFP_NOIO);
5e7dccad CS	276	if (!rq) {
	277	sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
	278	return NULL;
	279	}
	280
b6ff1b14	281	rq->cmd_len = COMMAND_SIZE(cmd);
5e7dccad	282	rq->cmd[0] = cmd;
5e7dccad CS	283
	284	switch (cmd) {
	285	case MODE_SELECT:
b6ff1b14 HR	286	len = sizeof(short_trespass);
	287	rq->cmd_flags \|= REQ_RW;
	288	rq->cmd[1] = 0x10;
	289	break;
	290	case MODE_SELECT_10:
	291	len = sizeof(long_trespass);
5e7dccad CS	292	rq->cmd_flags \|= REQ_RW;
	293	rq->cmd[1] = 0x10;
	294	break;
	295	case INQUIRY:
5e7dccad	296	len = CLARIION_BUFFER_SIZE;
b6ff1b14	297	memset(buffer, 0, len);
5e7dccad CS	298	break;
	299	default:
	300	BUG_ON(1);
	301	break;
	302	}
	303
	304	rq->cmd[4] = len;
	305	rq->cmd_type = REQ_TYPE_BLOCK_PC;
6000a368 MC	306	rq->cmd_flags \|= REQ_FAILFAST_DEV \| REQ_FAILFAST_TRANSPORT \|
6000a368 MC	307	REQ_FAILFAST_DRIVER;
5e7dccad CS	308	rq->timeout = CLARIION_TIMEOUT;
	309	rq->retries = CLARIION_RETRIES;
	310
b6ff1b14 HR	311	if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) {
b6ff1b14 HR	312	blk_put_request(rq);
5e7dccad CS	313	return NULL;
	314	}
	315
	316	return rq;
	317	}
	318
b6ff1b14 HR	319	static int send_inquiry_cmd(struct scsi_device *sdev, int page,
b6ff1b14 HR	320	struct clariion_dh_data *csdev)
5e7dccad	321	{
b6ff1b14 HR	322	struct request *rq = get_req(sdev, INQUIRY, csdev->buffer);
b6ff1b14 HR	323	int err;
5e7dccad CS	324
	325	if (!rq)
	326	return SCSI_DH_RES_TEMP_UNAVAIL;
	327
b6ff1b14 HR	328	rq->sense = csdev->sense;
	329	memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
	330	rq->sense_len = csdev->senselen = 0;
	331
	332	rq->cmd[0] = INQUIRY;
	333	if (page != 0) {
	334	rq->cmd[1] = 1;
	335	rq->cmd[2] = page;
	336	}
	337	err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
	338	if (err == -EIO) {
	339	sdev_printk(KERN_INFO, sdev,
	340	"%s: failed to send %s INQUIRY: %x\n",
	341	CLARIION_NAME, page?"EVPD":"standard",
	342	rq->errors);
	343	csdev->senselen = rq->sense_len;
	344	err = SCSI_DH_IO;
	345	}
	346
	347	blk_put_request(rq);
	348
	349	return err;
5e7dccad CS	350	}
5e7dccad CS	351
b6ff1b14 HR	352	static int send_trespass_cmd(struct scsi_device *sdev,
b6ff1b14 HR	353	struct clariion_dh_data *csdev)
5e7dccad	354	{
b6ff1b14 HR	355	struct request *rq;
	356	unsigned char *page22;
	357	int err, len, cmd;
	358
	359	if (csdev->flags & CLARIION_SHORT_TRESPASS) {
	360	page22 = short_trespass;
	361	if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
	362	/* Set Honor Reservations bit */
	363	page22[6] \|= 0x80;
	364	len = sizeof(short_trespass);
	365	cmd = MODE_SELECT;
	366	} else {
	367	page22 = long_trespass;
	368	if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
	369	/* Set Honor Reservations bit */
	370	page22[10] \|= 0x80;
	371	len = sizeof(long_trespass);
	372	cmd = MODE_SELECT_10;
	373	}
	374	BUG_ON((len > CLARIION_BUFFER_SIZE));
	375	memcpy(csdev->buffer, page22, len);
5e7dccad	376
b6ff1b14 HR	377	rq = get_req(sdev, cmd, csdev->buffer);
	378	if (!rq)
	379	return SCSI_DH_RES_TEMP_UNAVAIL;
5e7dccad	380
b6ff1b14 HR	381	rq->sense = csdev->sense;
	382	memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
	383	rq->sense_len = csdev->senselen = 0;
5e7dccad	384
b6ff1b14 HR	385	err = blk_execute_rq(sdev->request_queue, NULL, rq, 1);
	386	if (err == -EIO) {
	387	if (rq->sense_len) {
	388	err = trespass_endio(sdev, csdev->sense);
	389	} else {
	390	sdev_printk(KERN_INFO, sdev,
	391	"%s: failed to send MODE SELECT: %x\n",
	392	CLARIION_NAME, rq->errors);
	393	}
	394	}
	395
	396	blk_put_request(rq);
	397
	398	return err;
5e7dccad CS	399	}
	400
	401	static int clariion_check_sense(struct scsi_device *sdev,
	402	struct scsi_sense_hdr *sense_hdr)
	403	{
	404	switch (sense_hdr->sense_key) {
	405	case NOT_READY:
	406	if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
	407	/*
	408	* LUN Not Ready - Manual Intervention Required
	409	* indicates this is a passive path.
	410	*
	411	* FIXME: However, if this is seen and EVPD C0
	412	* indicates that this is due to a NDU in
	413	* progress, we should set FAIL_PATH too.
	414	* This indicates we might have to do a SCSI
	415	* inquiry in the end_io path. Ugh.
	416	*
	417	* Can return FAILED only when we want the error
	418	* recovery process to kick in.
	419	*/
	420	return SUCCESS;
	421	break;
	422	case ILLEGAL_REQUEST:
	423	if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
	424	/*
	425	* An array based copy is in progress. Do not
	426	* fail the path, do not bypass to another PG,
	427	* do not retry. Fail the IO immediately.
	428	* (Actually this is the same conclusion as in
	429	* the default handler, but lets make sure.)
	430	*
	431	* Can return FAILED only when we want the error
	432	* recovery process to kick in.
	433	*/
	434	return SUCCESS;
	435	break;
	436	case UNIT_ATTENTION:
	437	if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
	438	/*
	439	* Unit Attention Code. This is the first IO
	440	* to the new path, so just retry.
	441	*/
c7dbb627	442	return ADD_TO_MLQUEUE;
5e7dccad CS	443	break;
	444	}
	445
b6ff1b14 HR	446	return SCSI_RETURN_NOT_HANDLED;
	447	}
	448
	449	static int clariion_prep_fn(struct scsi_device sdev, struct request req)
	450	{
	451	struct clariion_dh_data *h = get_clariion_data(sdev);
	452	int ret = BLKPREP_OK;
	453
	454	if (h->lun_state != CLARIION_LUN_OWNED) {
	455	ret = BLKPREP_KILL;
	456	req->cmd_flags \|= REQ_QUIET;
	457	}
	458	return ret;
	459
	460	}
	461
	462	static int clariion_std_inquiry(struct scsi_device *sdev,
	463	struct clariion_dh_data *csdev)
	464	{
	465	int err;
	466	char *sp_model;
	467
	468	err = send_inquiry_cmd(sdev, 0, csdev);
	469	if (err != SCSI_DH_OK && csdev->senselen) {
	470	struct scsi_sense_hdr sshdr;
	471
	472	if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
	473	&sshdr)) {
	474	sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
	475	"%02x/%02x/%02x\n", CLARIION_NAME,
	476	sshdr.sense_key, sshdr.asc, sshdr.ascq);
	477	}
	478	err = SCSI_DH_IO;
	479	goto out;
	480	}
	481
	482	sp_model = parse_sp_model(sdev, csdev->buffer);
	483	if (!sp_model) {
	484	err = SCSI_DH_DEV_UNSUPP;
	485	goto out;
	486	}
	487
	488	/*
	489	* FC Series arrays do not support long trespass
	490	*/
	491	if (!strlen(sp_model) \|\| !strncmp(sp_model, "FC",2))
	492	csdev->flags \|= CLARIION_SHORT_TRESPASS;
	493
	494	sdev_printk(KERN_INFO, sdev,
	495	"%s: detected Clariion %s, flags %x\n",
	496	CLARIION_NAME, sp_model, csdev->flags);
	497	out:
	498	return err;
	499	}
	500
	501	static int clariion_send_inquiry(struct scsi_device *sdev,
	502	struct clariion_dh_data *csdev)
	503	{
	504	int err, retry = CLARIION_RETRIES;
	505
	506	retry:
	507	err = send_inquiry_cmd(sdev, 0xC0, csdev);
	508	if (err != SCSI_DH_OK && csdev->senselen) {
	509	struct scsi_sense_hdr sshdr;
510
511	err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE,
512	&sshdr);
513	if (!err)
514	return SCSI_DH_IO;
515
516	err = clariion_check_sense(sdev, &sshdr);
c7dbb627	517	if (retry > 0 && err == ADD_TO_MLQUEUE) {
b6ff1b14 HR	518	retry--;
	519	goto retry;
	520	}
	521	sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code "
	522	"%02x/%02x/%02x\n", CLARIION_NAME,
	523	sshdr.sense_key, sshdr.asc, sshdr.ascq);
	524	err = SCSI_DH_IO;
	525	} else {
	526	err = parse_sp_info_reply(sdev, csdev);
	527	}
	528	return err;
	529	}
	530
	531	static int clariion_activate(struct scsi_device *sdev)
	532	{
	533	struct clariion_dh_data *csdev = get_clariion_data(sdev);
	534	int result;
	535
	536	result = clariion_send_inquiry(sdev, csdev);
	537	if (result != SCSI_DH_OK)
	538	goto done;
	539
	540	if (csdev->lun_state == CLARIION_LUN_OWNED)
	541	goto done;
	542
	543	result = send_trespass_cmd(sdev, csdev);
	544	if (result != SCSI_DH_OK)
	545	goto done;
	546	sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
	547	CLARIION_NAME,
	548	csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
	549
	550	/* Update status */
	551	result = clariion_send_inquiry(sdev, csdev);
	552	if (result != SCSI_DH_OK)
	553	goto done;
	554
	555	done:
	556	sdev_printk(KERN_INFO, sdev,
	557	"%s: at SP %c Port %d (%s, default SP %c)\n",
	558	CLARIION_NAME, csdev->current_sp + 'A',
	559	csdev->port, lun_state[csdev->lun_state],
	560	csdev->default_sp + 'A');
	561
	562	return result;
5e7dccad CS	563	}
5e7dccad CS	564
f08c0761	565	static const struct scsi_dh_devlist clariion_dev_list[] = {
5e7dccad CS	566	{"DGC", "RAID"},
5e7dccad CS	567	{"DGC", "DISK"},
b6ff1b14	568	{"DGC", "VRAID"},
5e7dccad CS	569	{NULL, NULL},
	570	};
	571
765cbc6d HR	572	static int clariion_bus_attach(struct scsi_device *sdev);
765cbc6d HR	573	static void clariion_bus_detach(struct scsi_device *sdev);
5e7dccad CS	574
	575	static struct scsi_device_handler clariion_dh = {
	576	.name = CLARIION_NAME,
	577	.module = THIS_MODULE,
765cbc6d HR	578	.devlist = clariion_dev_list,
	579	.attach = clariion_bus_attach,
	580	.detach = clariion_bus_detach,
5e7dccad CS	581	.check_sense = clariion_check_sense,
5e7dccad CS	582	.activate = clariion_activate,
b6ff1b14	583	.prep_fn = clariion_prep_fn,
5e7dccad CS	584	};
	585
	586	/*
	587	* TODO: need some interface so we can set trespass values
	588	*/
765cbc6d	589	static int clariion_bus_attach(struct scsi_device *sdev)
5e7dccad	590	{
5e7dccad CS	591	struct scsi_dh_data *scsi_dh_data;
5e7dccad CS	592	struct clariion_dh_data *h;
5e7dccad	593	unsigned long flags;
b6ff1b14	594	int err;
5e7dccad	595
765cbc6d HR	596	scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *)
	597	+ sizeof(*h) , GFP_KERNEL);
	598	if (!scsi_dh_data) {
b6ff1b14	599	sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n",
765cbc6d HR	600	CLARIION_NAME);
	601	return -ENOMEM;
	602	}
5e7dccad	603
765cbc6d HR	604	scsi_dh_data->scsi_dh = &clariion_dh;
765cbc6d HR	605	h = (struct clariion_dh_data *) scsi_dh_data->buf;
b6ff1b14	606	h->lun_state = CLARIION_LUN_UNINITIALIZED;
765cbc6d HR	607	h->default_sp = CLARIION_UNBOUND_LU;
765cbc6d HR	608	h->current_sp = CLARIION_UNBOUND_LU;
5e7dccad	609
b6ff1b14 HR	610	err = clariion_std_inquiry(sdev, h);
	611	if (err != SCSI_DH_OK)
	612	goto failed;
	613
	614	err = clariion_send_inquiry(sdev, h);
	615	if (err != SCSI_DH_OK)
	616	goto failed;
	617
	618	if (!try_module_get(THIS_MODULE))
	619	goto failed;
	620
765cbc6d HR	621	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
	622	sdev->scsi_dh_data = scsi_dh_data;
	623	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
5e7dccad	624
b6ff1b14 HR	625	sdev_printk(KERN_INFO, sdev,
	626	"%s: connected to SP %c Port %d (%s, default SP %c)\n",
	627	CLARIION_NAME, h->current_sp + 'A',
	628	h->port, lun_state[h->lun_state],
	629	h->default_sp + 'A');
5e7dccad	630
765cbc6d	631	return 0;
b6ff1b14 HR	632
	633	failed:
	634	kfree(scsi_dh_data);
	635	sdev_printk(KERN_ERR, sdev, "%s: not attached\n",
	636	CLARIION_NAME);
	637	return -EINVAL;
765cbc6d	638	}
5e7dccad	639
765cbc6d HR	640	static void clariion_bus_detach(struct scsi_device *sdev)
	641	{
	642	struct scsi_dh_data *scsi_dh_data;
	643	unsigned long flags;
5e7dccad	644
765cbc6d HR	645	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
	646	scsi_dh_data = sdev->scsi_dh_data;
	647	sdev->scsi_dh_data = NULL;
	648	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
5e7dccad	649
b6ff1b14	650	sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n",
765cbc6d	651	CLARIION_NAME);
5e7dccad	652
765cbc6d HR	653	kfree(scsi_dh_data);
765cbc6d HR	654	module_put(THIS_MODULE);
5e7dccad CS	655	}
	656
	657	static int __init clariion_init(void)
	658	{
	659	int r;
	660
	661	r = scsi_register_device_handler(&clariion_dh);
	662	if (r != 0)
b6ff1b14 HR	663	printk(KERN_ERR "%s: Failed to register scsi device handler.",
b6ff1b14 HR	664	CLARIION_NAME);
5e7dccad CS	665	return r;
	666	}
	667
	668	static void __exit clariion_exit(void)
	669	{
	670	scsi_unregister_device_handler(&clariion_dh);
	671	}
	672
	673	module_init(clariion_init);
	674	module_exit(clariion_exit);
	675
	676	MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
	677	MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
	678	MODULE_LICENSE("GPL");