1 files changed, 725 insertions, 0 deletions

diff --git a/kernel/drivers/scsi/device_handler/scsi_dh_emc.c b/kernel/drivers/scsi/device_handler/scsi_dh_emc.c
new file mode 100644
index 000000000..6ed1caadb
--- /dev/null
+++ b/kernel/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -0,0 +1,725 @@
+/*
+ * 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 <linux/slab.h>
+#include <linux/module.h>
+#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 {
+	struct scsi_dh_data 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)
+{
+	return container_of(sdev->scsi_dh_data, struct clariion_dh_data,
+			dh_data);
+}
+
+/*
+ * 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 != INQUIRY) ? WRITE : READ, GFP_NOIO);
+	if (IS_ERR(rq)) {
+		sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
+		return NULL;
+	}
+
+	blk_rq_set_block_pc(rq);
+	rq->cmd_len = COMMAND_SIZE(cmd);
+	rq->cmd[0] = cmd;
+
+	switch (cmd) {
+	case MODE_SELECT:
+		len = sizeof(short_trespass);
+		rq->cmd[1] = 0x10;
+		rq->cmd[4] = len;
+		break;
+	case MODE_SELECT_10:
+		len = sizeof(long_trespass);
+		rq->cmd[1] = 0x10;
+		rq->cmd[8] = len;
+		break;
+	case INQUIRY:
+		len = CLARIION_BUFFER_SIZE;
+		rq->cmd[4] = len;
+		memset(buffer, 0, len);
+		break;
+	default:
+		BUG_ON(1);
+		break;
+	}
+
+	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,
+				activate_complete fn, void *data)
+{
+	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');
+
+	if (fn)
+		fn(data, result);
+	return 0;
+}
+/*
+ * params - parameters in the following format
+ *      "no_of_params\0param1\0param2\0param3\0...\0"
+ *      for example, string for 2 parameters with value 10 and 21
+ *      is specified as "2\010\021\0".
+ */
+static int clariion_set_params(struct scsi_device *sdev, const char *params)
+{
+	struct clariion_dh_data *csdev = get_clariion_data(sdev);
+	unsigned int hr = 0, st = 0, argc;
+	const char *p = params;
+	int result = SCSI_DH_OK;
+
+	if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
+		return -EINVAL;
+
+	while (*p++)
+		;
+	if ((sscanf(p, "%u", &st) != 1) || (st > 1))
+		return -EINVAL;
+
+	while (*p++)
+		;
+	if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
+		return -EINVAL;
+
+	if (st)
+		csdev->flags |= CLARIION_SHORT_TRESPASS;
+	else
+		csdev->flags &= ~CLARIION_SHORT_TRESPASS;
+
+	if (hr)
+		csdev->flags |= CLARIION_HONOR_RESERVATIONS;
+	else
+		csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
+
+	/*
+	 * If this path is owned, we have to send a trespass command
+	 * with the new parameters. If not, simply return. Next trespass
+	 * command would use the parameters.
+	 */
+	if (csdev->lun_state != CLARIION_LUN_OWNED)
+		goto done;
+
+	csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
+	result = send_trespass_cmd(sdev, csdev);
+	if (result != SCSI_DH_OK)
+		goto done;
+
+	/* Update status */
+	result = clariion_send_inquiry(sdev, csdev);
+
+done:
+	return result;
+}
+
+static const struct {
+	char *vendor;
+	char *model;
+} clariion_dev_list[] = {
+	{"DGC", "RAID"},
+	{"DGC", "DISK"},
+	{"DGC", "VRAID"},
+	{NULL, NULL},
+};
+
+static bool clariion_match(struct scsi_device *sdev)
+{
+	int i;
+
+	if (scsi_device_tpgs(sdev))
+		return false;
+
+	for (i = 0; clariion_dev_list[i].vendor; i++) {
+		if (!strncmp(sdev->vendor, clariion_dev_list[i].vendor,
+			strlen(clariion_dev_list[i].vendor)) &&
+		    !strncmp(sdev->model, clariion_dev_list[i].model,
+			strlen(clariion_dev_list[i].model))) {
+			return true;
+		}
+	}
+	return false;
+}
+
+static struct scsi_dh_data *clariion_bus_attach(struct scsi_device *sdev)
+{
+	struct clariion_dh_data *h;
+	int err;
+
+	h = kzalloc(sizeof(*h) , GFP_KERNEL);
+	if (!h)
+		return ERR_PTR(-ENOMEM);
+	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;
+
+	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 &h->dh_data;
+
+failed:
+	kfree(h);
+	return ERR_PTR(-EINVAL);
+}
+
+static void clariion_bus_detach(struct scsi_device *sdev)
+{
+	struct clariion_dh_data *h = get_clariion_data(sdev);
+
+	kfree(h);
+}
+
+static struct scsi_device_handler clariion_dh = {
+	.name		= CLARIION_NAME,
+	.module		= THIS_MODULE,
+	.attach		= clariion_bus_attach,
+	.detach		= clariion_bus_detach,
+	.check_sense	= clariion_check_sense,
+	.activate	= clariion_activate,
+	.prep_fn	= clariion_prep_fn,
+	.set_params	= clariion_set_params,
+	.match		= clariion_match,
+};
+
+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");