Attachment 314157 Details for Bug 438761 – Handler for RDAC device

Handler for RDAC device

02-scsi_dh-scsi-add-lsi-rdac-dh.patch (text/plain), 18.41 KB, created by IBM Bug Proxy on 2008-08-13 00:51:19 UTC

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Creator: IBM Bug Proxy

Created: 2008-08-13 00:51:19 UTC

Size: 18.41 KB

patch

obsolete

>Subject: scsi_dh: add lsi rdac device handler
>
>From: Chandra Seetharaman <sekharan@us.ibm.com>
>
>This patch provides the device handler to support the LSI RDAC SCSI
>based storage devices.
>
>Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
>---
>
> drivers/scsi/device_handler/Kconfig        |    6 	6 +	0 -	0 !
> drivers/scsi/device_handler/Makefile       |    1 	1 +	0 -	0 !
> drivers/scsi/device_handler/scsi_dh_rdac.c |  678 	678 +	0 -	0 !
> 3 files changed, 685 insertions(+)
>
>Index: linux-2.6.18.ppc64/drivers/scsi/device_handler/Kconfig
>===================================================================
>--- linux-2.6.18.ppc64.orig/drivers/scsi/device_handler/Kconfig
>+++ linux-2.6.18.ppc64/drivers/scsi/device_handler/Kconfig
>@@ -10,3 +10,9 @@ menuconfig SCSI_DH
> 	  SCSI Device Handlers provide device specific support for
> 	  devices utilized in multipath configurations. Say Y here to
> 	  select support for specific hardware.
>+
>+config SCSI_DH_RDAC
>+	tristate "LSI RDAC Device Handler"
>+	depends on SCSI_DH
>+	help
>+	If you have a LSI RDAC select y. Otherwise, say N.
>Index: linux-2.6.18.ppc64/drivers/scsi/device_handler/scsi_dh_rdac.c
>===================================================================
>--- /dev/null
>+++ linux-2.6.18.ppc64/drivers/scsi/device_handler/scsi_dh_rdac.c
>@@ -0,0 +1,698 @@
>+/*
>+ * Engenio/LSI RDAC SCSI Device Handler
>+ *
>+ * Copyright (C) 2005 Mike Christie. All rights reserved.
>+ * Copyright (C) Chandra Seetharaman, IBM Corp. 2007
>+ *
>+ * 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 of the License, 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; if not, write to the Free Software
>+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
>+ *
>+ */
>+#include <linux/list.h>
>+#include <scsi/scsi.h>
>+#include <scsi/scsi_eh.h>
>+#include <scsi/scsi_cmnd.h>
>+#include <scsi/scsi_dh.h>
>+#include "../scsi_priv.h"
>+
>+#define RDAC_NAME "rdac"
>+
>+/*
>+ * LSI mode page stuff
>+ *
>+ * These struct definitions and the forming of the
>+ * mode page were taken from the LSI RDAC 2.4 GPL'd
>+ * driver, and then converted to Linux conventions.
>+ */
>+#define RDAC_QUIESCENCE_TIME 20;
>+/*
>+ * Page Codes
>+ */
>+#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
>+
>+/*
>+ * Controller modes definitions
>+ */
>+#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS	0x02
>+
>+/*
>+ * RDAC Options field
>+ */
>+#define RDAC_FORCED_QUIESENCE 0x02
>+
>+#define RDAC_TIMEOUT	(60 * HZ)
>+#define RDAC_RETRIES	3
>+
>+struct rdac_mode_6_hdr {
>+	u8	data_len;
>+	u8	medium_type;
>+	u8	device_params;
>+	u8	block_desc_len;
>+};
>+
>+struct rdac_mode_10_hdr {
>+	u16	data_len;
>+	u8	medium_type;
>+	u8	device_params;
>+	u16	reserved;
>+	u16	block_desc_len;
>+};
>+
>+struct rdac_mode_common {
>+	u8	controller_serial[16];
>+	u8	alt_controller_serial[16];
>+	u8	rdac_mode[2];
>+	u8	alt_rdac_mode[2];
>+	u8	quiescence_timeout;
>+	u8	rdac_options;
>+};
>+
>+struct rdac_pg_legacy {
>+	struct rdac_mode_6_hdr hdr;
>+	u8	page_code;
>+	u8	page_len;
>+	struct rdac_mode_common common;
>+#define MODE6_MAX_LUN	32
>+	u8	lun_table[MODE6_MAX_LUN];
>+	u8	reserved2[32];
>+	u8	reserved3;
>+	u8	reserved4;
>+};
>+
>+struct rdac_pg_expanded {
>+	struct rdac_mode_10_hdr hdr;
>+	u8	page_code;
>+	u8	subpage_code;
>+	u8	page_len[2];
>+	struct rdac_mode_common common;
>+	u8	lun_table[256];
>+	u8	reserved3;
>+	u8	reserved4;
>+};
>+
>+struct c9_inquiry {
>+	u8	peripheral_info;
>+	u8	page_code;	/* 0xC9 */
>+	u8	reserved1;
>+	u8	page_len;
>+	u8	page_id[4];	/* "vace" */
>+	u8	avte_cvp;
>+	u8	path_prio;
>+	u8	reserved2[38];
>+};
>+
>+#define SUBSYS_ID_LEN	16
>+#define SLOT_ID_LEN	2
>+
>+struct c4_inquiry {
>+	u8	peripheral_info;
>+	u8	page_code;	/* 0xC4 */
>+	u8	reserved1;
>+	u8	page_len;
>+	u8	page_id[4];	/* "subs" */
>+	u8	subsys_id[SUBSYS_ID_LEN];
>+	u8	revision[4];
>+	u8	slot_id[SLOT_ID_LEN];
>+	u8	reserved[2];
>+};
>+
>+struct rdac_controller {
>+	u8			subsys_id[SUBSYS_ID_LEN];
>+	u8			slot_id[SLOT_ID_LEN];
>+	int			use_ms10;
>+	struct kref		kref;
>+	struct list_head	node; /* list of all controllers */
>+	union			{
>+		struct rdac_pg_legacy legacy;
>+		struct rdac_pg_expanded expanded;
>+	} mode_select;
>+};
>+struct c8_inquiry {
>+	u8	peripheral_info;
>+	u8	page_code; /* 0xC8 */
>+	u8	reserved1;
>+	u8	page_len;
>+	u8	page_id[4]; /* "edid" */
>+	u8	reserved2[3];
>+	u8	vol_uniq_id_len;
>+	u8	vol_uniq_id[16];
>+	u8	vol_user_label_len;
>+	u8	vol_user_label[60];
>+	u8	array_uniq_id_len;
>+	u8	array_unique_id[16];
>+	u8	array_user_label_len;
>+	u8	array_user_label[60];
>+	u8	lun[8];
>+};
>+
>+struct c2_inquiry {
>+	u8	peripheral_info;
>+	u8	page_code;	/* 0xC2 */
>+	u8	reserved1;
>+	u8	page_len;
>+	u8	page_id[4];	/* "swr4" */
>+	u8	sw_version[3];
>+	u8	sw_date[3];
>+	u8	features_enabled;
>+	u8	max_lun_supported;
>+	u8	partitions[239]; /* Total allocation length should be 0xFF */
>+};
>+
>+struct rdac_dh_data {
>+	struct rdac_controller	*ctlr;
>+#define UNINITIALIZED_LUN	(1 << 8)
>+	unsigned		lun;
>+#define RDAC_STATE_ACTIVE	0
>+#define RDAC_STATE_PASSIVE	1
>+	unsigned char		state;
>+
>+#define RDAC_LUN_UNOWNED	0
>+#define RDAC_LUN_OWNED		1
>+#define RDAC_LUN_AVT		2
>+	char			lun_state;
>+	unsigned char		sense[SCSI_SENSE_BUFFERSIZE];
>+	union			{
>+		struct c2_inquiry c2;
>+		struct c4_inquiry c4;
>+		struct c8_inquiry c8;
>+		struct c9_inquiry c9;
>+	} inq;
>+};
>+
>+static const char *lun_state[] =
>+{
>+	"unowned",
>+	"owned",
>+	"owned (AVT mode)",
>+};
>+
>+static LIST_HEAD(ctlr_list);
>+static DEFINE_SPINLOCK(list_lock);
>+
>+static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
>+{
>+	struct scsi_dh_data *scsi_dh_data = retrieve_scsi_dh_data(sdev);
>+	BUG_ON(scsi_dh_data == NULL);
>+	return ((struct rdac_dh_data *) scsi_dh_data->buf);
>+}
>+
>+static struct request *get_rdac_req(struct scsi_device *sdev,
>+			void *buffer, unsigned buflen, int rw)
>+{
>+	struct request *rq;
>+	struct request_queue *q = sdev->request_queue;
>+
>+	rq = blk_get_request(q, rw, GFP_NOIO);
>+
>+	if (!rq) {
>+		sdev_printk(KERN_INFO, sdev,
>+				"get_rdac_req: blk_get_request failed.\n");
>+		return NULL;
>+	}
>+
>+	if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
>+		blk_put_request(rq);
>+		sdev_printk(KERN_INFO, sdev,
>+				"get_rdac_req: blk_rq_map_kern failed.\n");
>+		return NULL;
>+	}
>+
>+	memset(rq->cmd, 0, BLK_MAX_CDB);
>+
>+	rq->flags |= REQ_FAILFAST | REQ_NOMERGE | REQ_BLOCK_PC;
>+	rq->retries = RDAC_RETRIES;
>+	rq->timeout = RDAC_TIMEOUT;
>+
>+	return rq;
>+}
>+
>+static struct request *rdac_failover_get(struct scsi_device *sdev,
>+					 struct rdac_dh_data *h)
>+{
>+	struct request *rq;
>+	struct rdac_mode_common *common;
>+	unsigned data_size;
>+
>+	if (h->ctlr->use_ms10) {
>+		struct rdac_pg_expanded *rdac_pg;
>+
>+		data_size = sizeof(struct rdac_pg_expanded);
>+		rdac_pg = &h->ctlr->mode_select.expanded;
>+		memset(rdac_pg, 0, data_size);
>+		common = &rdac_pg->common;
>+		rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
>+		rdac_pg->subpage_code = 0x1;
>+		rdac_pg->page_len[0] = 0x01;
>+		rdac_pg->page_len[1] = 0x28;
>+		rdac_pg->lun_table[h->lun] = 0x81;
>+	} else {
>+		struct rdac_pg_legacy *rdac_pg;
>+
>+		data_size = sizeof(struct rdac_pg_legacy);
>+		rdac_pg = &h->ctlr->mode_select.legacy;
>+		memset(rdac_pg, 0, data_size);
>+		common = &rdac_pg->common;
>+		rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
>+		rdac_pg->page_len = 0x68;
>+		rdac_pg->lun_table[h->lun] = 0x81;
>+	}
>+	common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
>+	common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
>+	common->rdac_options = RDAC_FORCED_QUIESENCE;
>+
>+	/* get request for block layer packet command */
>+	rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
>+	if (!rq)
>+		return NULL;
>+
>+	/* Prepare the command. */
>+	if (h->ctlr->use_ms10) {
>+		rq->cmd[0] = MODE_SELECT_10;
>+		rq->cmd[7] = data_size >> 8;
>+		rq->cmd[8] = data_size & 0xff;
>+	} else {
>+		rq->cmd[0] = MODE_SELECT;
>+		rq->cmd[4] = data_size;
>+	}
>+	rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
>+
>+	rq->sense = h->sense;
>+	memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
>+	rq->sense_len = 0;
>+
>+	return rq;
>+}
>+
>+static void release_controller(struct kref *kref)
>+{
>+	struct rdac_controller *ctlr;
>+	ctlr = container_of(kref, struct rdac_controller, kref);
>+
>+	spin_lock(&list_lock);
>+	list_del(&ctlr->node);
>+	spin_unlock(&list_lock);
>+	kfree(ctlr);
>+}
>+
>+static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id)
>+{
>+	struct rdac_controller *ctlr, *tmp;
>+
>+	spin_lock(&list_lock);
>+
>+	list_for_each_entry(tmp, &ctlr_list, node) {
>+		if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
>+			  (memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
>+			kref_get(&tmp->kref);
>+			spin_unlock(&list_lock);
>+			return tmp;
>+		}
>+	}
>+	ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
>+	if (!ctlr)
>+		goto done;
>+
>+	/* initialize fields of controller */
>+	memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
>+	memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
>+	kref_init(&ctlr->kref);
>+	ctlr->use_ms10 = -1;
>+	list_add(&ctlr->node, &ctlr_list);
>+done:
>+	spin_unlock(&list_lock);
>+	return ctlr;
>+}
>+
>+static int submit_inquiry(struct scsi_device *sdev, int page_code,
>+			  unsigned int len, struct rdac_dh_data *h)
>+{
>+	struct request *rq;
>+	struct request_queue *q = sdev->request_queue;
>+	int err = SCSI_DH_RES_TEMP_UNAVAIL;
>+
>+	rq = get_rdac_req(sdev, &h->inq, len, READ);
>+	if (!rq)
>+		goto done;
>+
>+	/* Prepare the command. */
>+	rq->cmd[0] = INQUIRY;
>+	rq->cmd[1] = 1;
>+	rq->cmd[2] = page_code;
>+	rq->cmd[4] = len;
>+	rq->cmd_len = COMMAND_SIZE(INQUIRY);
>+
>+	rq->sense = h->sense;
>+	memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
>+	rq->sense_len = 0;
>+
>+	err = blk_execute_rq(q, NULL, rq, 1);
>+	if (err == -EIO)
>+		err = SCSI_DH_IO;
>+
>+	blk_put_request(rq);
>+done:
>+	return err;
>+}
>+
>+static int get_lun(struct scsi_device *sdev, struct rdac_dh_data *h)
>+{
>+	int err;
>+	struct c8_inquiry *inqp;
>+
>+	err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
>+	if (err == SCSI_DH_OK) {
>+		inqp = &h->inq.c8;
>+		if (inqp->page_code != 0xc8)
>+			return SCSI_DH_NOSYS;
>+		if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
>+		    inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
>+			return SCSI_DH_NOSYS;
>+		h->lun = inqp->lun[7]; /* Uses only the last byte */
>+	}
>+	return err;
>+}
>+
>+static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
>+{
>+	int err;
>+	struct c9_inquiry *inqp;
>+
>+	h->lun_state = RDAC_LUN_UNOWNED;
>+	err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
>+	if (err == SCSI_DH_OK) {
>+		inqp = &h->inq.c9;
>+		if ((inqp->avte_cvp >> 7) == 0x1) {
>+			/* LUN in AVT mode */
>+			sdev_printk(KERN_NOTICE, sdev,
>+				    "%s: AVT mode detected\n",
>+				    RDAC_NAME);
>+			h->lun_state = RDAC_LUN_AVT;
>+		} else if ((inqp->avte_cvp & 0x1) != 0) {
>+			/* LUN was owned by the controller */
>+			h->lun_state = RDAC_LUN_OWNED;
>+		}
>+	}
>+
>+	return err;
>+}
>+
>+static int initialize_controller(struct scsi_device *sdev,
>+				 struct rdac_dh_data *h)
>+{
>+	int err;
>+	struct c4_inquiry *inqp;
>+
>+	err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
>+	if (err == SCSI_DH_OK) {
>+		inqp = &h->inq.c4;
>+		h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id);
>+		if (!h->ctlr)
>+			err = SCSI_DH_RES_TEMP_UNAVAIL;
>+	}
>+	return err;
>+}
>+
>+static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
>+{
>+	int err;
>+	struct c2_inquiry *inqp;
>+
>+	err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
>+	if (err == SCSI_DH_OK) {
>+		inqp = &h->inq.c2;
>+		/*
>+		 * If more than MODE6_MAX_LUN luns are supported, use
>+		 * mode select 10
>+		 */
>+		if (inqp->max_lun_supported >= MODE6_MAX_LUN)
>+			h->ctlr->use_ms10 = 1;
>+		else
>+			h->ctlr->use_ms10 = 0;
>+	}
>+	return err;
>+}
>+
>+static int mode_select_handle_sense(struct scsi_device *sdev,
>+				    unsigned char *sensebuf)
>+{
>+	struct scsi_sense_hdr sense_hdr;
>+	int sense, err = SCSI_DH_IO, ret;
>+
>+	ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
>+	if (!ret)
>+		goto done;
>+
>+	err = SCSI_DH_OK;
>+	sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
>+			sense_hdr.ascq;
>+	/* If it is retryable failure, submit the c9 inquiry again */
>+	if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
>+			    sense == 0x62900) {
>+		/* 0x59136    - Command lock contention
>+		 * 0x[6b]8b02 - Quiesense in progress or achieved
>+		 * 0x62900    - Power On, Reset, or Bus Device Reset
>+		 */
>+		err = SCSI_DH_RETRY;
>+	}
>+
>+	if (sense)
>+		sdev_printk(KERN_INFO, sdev,
>+			"MODE_SELECT failed with sense 0x%x.\n", sense);
>+done:
>+	return err;
>+}
>+
>+static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
>+{
>+	struct request *rq;
>+	struct request_queue *q = sdev->request_queue;
>+	int err = SCSI_DH_RES_TEMP_UNAVAIL;
>+
>+	rq = rdac_failover_get(sdev, h);
>+	if (!rq)
>+		goto done;
>+
>+	sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command.\n");
>+
>+	err = blk_execute_rq(q, NULL, rq, 1);
>+	if (err != SCSI_DH_OK)
>+		err = mode_select_handle_sense(sdev, h->sense);
>+	if (err == SCSI_DH_OK)
>+		h->state = RDAC_STATE_ACTIVE;
>+
>+	blk_put_request(rq);
>+done:
>+	return err;
>+}
>+
>+static int rdac_activate(struct scsi_device *sdev)
>+{
>+	struct rdac_dh_data *h = get_rdac_data(sdev);
>+	int err = SCSI_DH_OK;
>+
>+	err = check_ownership(sdev, h);
>+	if (err != SCSI_DH_OK)
>+		goto done;
>+
>+	if (!h->ctlr) {
>+		err = initialize_controller(sdev, h);
>+		if (err != SCSI_DH_OK)
>+			goto done;
>+	}
>+
>+	if (h->ctlr->use_ms10 == -1) {
>+		err = set_mode_select(sdev, h);
>+		if (err != SCSI_DH_OK)
>+			goto done;
>+	}
>+	if (h->lun_state == RDAC_LUN_UNOWNED)
>+		err = send_mode_select(sdev, h);
>+done:
>+	return err;
>+}
>+
>+static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
>+{
>+	struct rdac_dh_data *h = get_rdac_data(sdev);
>+	int ret = BLKPREP_OK;
>+
>+	if (h->state != RDAC_STATE_ACTIVE) {
>+		ret = BLKPREP_KILL;
>+		req->flags |= REQ_QUIET;
>+	}
>+	return ret;
>+
>+}
>+
>+static int rdac_check_sense(struct scsi_device *sdev,
>+				struct scsi_sense_hdr *sense_hdr)
>+{
>+	struct rdac_dh_data *h = get_rdac_data(sdev);
>+	switch (sense_hdr->sense_key) {
>+	case NOT_READY:
>+		if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
>+			/* LUN Not Ready - Storage firmware incompatible
>+			 * Manual code synchonisation required.
>+			 *
>+			 * Nothing we can do here. Try to bypass the path.
>+			 */
>+			return SUCCESS;
>+		if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
>+			/* LUN Not Ready - Quiescense in progress
>+			 *
>+			 * Just retry and wait.
>+			 */
>+			return NEEDS_RETRY;
>+		break;
>+	case ILLEGAL_REQUEST:
>+		if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
>+			/* Invalid Request - Current Logical Unit Ownership.
>+			 * Controller is not the current owner of the LUN,
>+			 * Fail the path, so that the other path be used.
>+			 */
>+			h->state = RDAC_STATE_PASSIVE;
>+			return SUCCESS;
>+		}
>+		break;
>+	case UNIT_ATTENTION:
>+		if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
>+			/*
>+			 * Power On, Reset, or Bus Device Reset, just retry.
>+			 */
>+			return NEEDS_RETRY;
>+		break;
>+	}
>+	/* success just means we do not care what scsi-ml does */
>+	return SCSI_RETURN_NOT_HANDLED;
>+}
>+
>+const struct scsi_dh_devlist rdac_dev_list[] = {
>+	{"IBM", "1722"},
>+	{"IBM", "1724"},
>+	{"IBM", "1726"},
>+	{"IBM", "1742"},
>+	{"IBM", "1814"},
>+	{"IBM", "1815"},
>+	{"IBM", "1818"},
>+	{"IBM", "3526"},
>+	{"SGI", "TP9400"},
>+	{"SGI", "TP9500"},
>+	{"SGI", "IS"},
>+	{"STK", "OPENstorage D280"},
>+	{"SUN", "CSM200_R"},
>+	{"SUN", "LCSM100_F"},
>+	{NULL, NULL},
>+};
>+
>+static int rdac_bus_attach(struct scsi_device *sdev);
>+static void rdac_bus_detach(struct scsi_device *sdev);
>+
>+static struct scsi_device_handler rdac_dh = {
>+	.name = RDAC_NAME,
>+	.module = THIS_MODULE,
>+	.devlist = rdac_dev_list,
>+	.prep_fn = rdac_prep_fn,
>+	.check_sense = rdac_check_sense,
>+	.attach = rdac_bus_attach,
>+	.detach = rdac_bus_detach,
>+	.activate = rdac_activate,
>+};
>+
>+/*
>+ * TODO: need some interface so we can set trespass values
>+ */
>+static int rdac_bus_attach(struct scsi_device *sdev)
>+{
>+	struct scsi_dh_data *scsi_dh_data;
>+	struct rdac_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", RDAC_NAME);
>+		return -ENOMEM;
>+	}
>+
>+	scsi_dh_data->scsi_dh = &rdac_dh;
>+	h = (struct rdac_dh_data *) scsi_dh_data->buf;
>+	h->lun = UNINITIALIZED_LUN;
>+	h->state = RDAC_STATE_ACTIVE;
>+
>+	err = get_lun(sdev, h);
>+	if (err != SCSI_DH_OK)
>+		goto failed;
>+
>+	err = check_ownership(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);
>+	store_scsi_dh_data(sdev, scsi_dh_data);
>+	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
>+
>+	sdev_printk(KERN_NOTICE, sdev, "%s: LUN %d (%s)\n",
>+			RDAC_NAME, h->lun, lun_state[(int)h->lun_state]);
>+	return 0;
>+
>+failed:
>+	kfree(scsi_dh_data);
>+	sdev_printk(KERN_ERR, sdev, "%s: not attached\n", RDAC_NAME);
>+	return -EINVAL;
>+}
>+
>+static void rdac_bus_detach(struct scsi_device *sdev)
>+{
>+	struct scsi_dh_data *scsi_dh_data;
>+	struct rdac_dh_data *h;
>+	unsigned long flags;
>+
>+	spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
>+	scsi_dh_data = retrieve_scsi_dh_data(sdev);
>+	store_scsi_dh_data(sdev, NULL);
>+	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
>+
>+	h = (struct rdac_dh_data *) scsi_dh_data->buf;
>+	if (h->ctlr)
>+		kref_put(&h->ctlr->kref, release_controller);
>+	kfree(scsi_dh_data);
>+	module_put(THIS_MODULE);
>+	sdev_printk(KERN_NOTICE, sdev, "%s Dettached\n", RDAC_NAME);
>+}
>+
>+static int __init rdac_init(void)
>+{
>+	int r;
>+
>+	r = scsi_register_device_handler(&rdac_dh);
>+	if (r != 0)
>+		printk(KERN_ERR "Failed to register scsi device handler.");
>+	return r;
>+}
>+
>+static void __exit rdac_exit(void)
>+{
>+	scsi_unregister_device_handler(&rdac_dh);
>+}
>+
>+module_init(rdac_init);
>+module_exit(rdac_exit);
>+
>+MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
>+MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
>+MODULE_LICENSE("GPL");
>Index: linux-2.6.18.ppc64/drivers/scsi/device_handler/Makefile
>===================================================================
>--- linux-2.6.18.ppc64.orig/drivers/scsi/device_handler/Makefile
>+++ linux-2.6.18.ppc64/drivers/scsi/device_handler/Makefile
>@@ -2,3 +2,4 @@
> # SCSI Device Handler
> #
> obj-$(CONFIG_SCSI_DH)		+= scsi_dh.o
>+obj-$(CONFIG_SCSI_DH_RDAC)	+= scsi_dh_rdac.o

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Attachments on bug 438761: 314153 | 314154 | 314155 | 314156 | 314157 | 314158 | 314159 | 314160 | 314161 | 314162 | 314163 | 314339 | 314426 | 314828 | 314829 | 316641