Subject: scsi_dh: add lsi rdac device handler
From: Chandra Seetharaman <sekharan@xxxxxxxxxx>
add LSI RDAC SCSI device handler
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
drivers/scsi/device_handler/Kconfig | 5 5 + 0 - 0 !
drivers/scsi/device_handler/Makefile | 1 1 + 0 - 0 !
drivers/scsi/device_handler/scsi_dh_lsi_rdac.c | 766 766 + 0 - 0 !
3 files changed, 772 insertions(+)
Index: linux-2.6.24-rc8/drivers/scsi/device_handler/Kconfig
===================================================================
--- linux-2.6.24-rc8.orig/drivers/scsi/device_handler/Kconfig
+++ linux-2.6.24-rc8/drivers/scsi/device_handler/Kconfig
@@ -25,4 +25,9 @@ config SCSI_DH_HP_SW
be sent to start it and cannot upgrade the firmware then select y.
Otherwise, say N.
+config SCSI_DH_LSI_RDAC
+ tristate "LSI RDAC Device Handler"
+ help
+ If you have a LSI RDAC select y. Otherwise, say N.
+
endif #SCSI_DH
Index: linux-2.6.24-rc8/drivers/scsi/device_handler/Makefile
===================================================================
--- linux-2.6.24-rc8.orig/drivers/scsi/device_handler/Makefile
+++ linux-2.6.24-rc8/drivers/scsi/device_handler/Makefile
@@ -4,3 +4,4 @@
obj-$(CONFIG_SCSI_DH_EMC) += scsi_dh_emc.o
obj-$(CONFIG_SCSI_DH_HP_SW) += scsi_dh_hp_sw.o
+obj-$(CONFIG_SCSI_DH_LSI_RDAC) += scsi_dh_lsi_rdac.o
Index: linux-2.6.24-rc8/drivers/scsi/device_handler/scsi_dh_lsi_rdac.c
===================================================================
--- /dev/null
+++ linux-2.6.24-rc8/drivers/scsi/device_handler/scsi_dh_lsi_rdac.c
@@ -0,0 +1,766 @@
+/*
+ * 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/blkdev.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
+
+#define RDAC_NAME "lsi_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_ALL_LUNS 0x01
+#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_10_ms;
+ struct kref kref;
+ struct list_head node; /* list of all controllers */
+ spinlock_t lock;
+ int submitted;
+ struct list_head cmd_list; /* list of commands to be submitted */
+ 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 list_head entry; /* list waiting to submit MODE SELECT */
+ struct rdac_controller *ctlr;
+#define UNINITIALIZED_LUN (1 << 8)
+ unsigned lun;
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ struct request *act_req;
+ struct work_struct work;
+#define SEND_C2_INQUIRY 1
+#define SEND_C4_INQUIRY 2
+#define SEND_C8_INQUIRY 3
+#define SEND_C9_INQUIRY 4
+#define SEND_MODE_SELECT 5
+ int cmd_to_send;
+ union {
+ struct c2_inquiry c2;
+ struct c4_inquiry c4;
+ struct c8_inquiry c8;
+ struct c9_inquiry c9;
+ } inq;
+};
+
+static LIST_HEAD(ctlr_list);
+static DEFINE_SPINLOCK(list_lock);
+static struct workqueue_struct *rdac_wkqd;
+
+static inline int had_failures(int result)
+{
+ return (host_byte(result) != DID_OK ||
+ msg_byte(result) != COMMAND_COMPLETE);
+}
+
+static void rdac_resubmit_all(struct rdac_dh_data *h)
+{
+ struct rdac_controller *ctlr = h->ctlr;
+ struct rdac_dh_data *tmp, *h1;
+
+ spin_lock(&ctlr->lock);
+ list_for_each_entry_safe(h1, tmp, &ctlr->cmd_list, entry) {
+ h1->cmd_to_send = SEND_C9_INQUIRY;
+ queue_work(rdac_wkqd, &h1->work);
+ list_del(&h1->entry);
+ }
+ ctlr->submitted = 0;
+ spin_unlock(&ctlr->lock);
+}
+
+static void mode_select_endio(struct request *req, int uptodate)
+{
+ struct request *act_req = req->end_io_data;
+ struct scsi_device *sdev = req->q->queuedata;
+ struct scsi_sense_hdr sense_hdr;
+ int sense, err = BLKERR_OK, result = req->errors;
+
+ if (had_failures(result)) {
+ err = BLKERR_DEV_FAILED;
+ goto failed;
+ }
+
+ if (status_byte(result) == CHECK_CONDITION) {
+ scsi_normalize_sense(req->sense, SCSI_SENSE_BUFFERSIZE,
+ &sense_hdr);
+ 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 = BLKERR_DEV_TEMP_BUSY;
+ }
+ if (sense)
+ sdev_printk(KERN_INFO, sdev,
+ "MODE_SELECT failed with sense 0x%x", sense);
+ } else if (result) {
+ sdev_printk(KERN_ERR, sdev, "Error 0x%x while sending "
+ "MODE_SELECT.\n", result);
+ err = BLKERR_IO;
+ }
+
+ scsi_device_set_state(sdev, SDEV_RUNNING);
+failed:
+ scsi_blk_linux_cmd_done(act_req, err);
+ rdac_resubmit_all(sdev->sdev_dh_data);
+ __blk_put_request(req->q, req);
+}
+
+static struct request *get_rdac_req(struct request *act_req,
+ void *buffer, unsigned buflen, int rw)
+{
+ struct request *rq;
+ struct request_queue *q = act_req->q;
+ struct scsi_device *sdev = q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+
+ rq = blk_get_request(q, rw, GFP_KERNEL);
+
+ if (!rq) {
+ sdev_printk(KERN_INFO, sdev,
+ "get_rdac_req: blk_get_request failed");
+ return NULL;
+ }
+
+ if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_KERNEL)) {
+ blk_put_request(rq);
+ sdev_printk(KERN_INFO, sdev,
+ "get_rdac_req: blk_rq_map_kern failed");
+ return NULL;
+ }
+
+ memset(&rq->cmd, 0, BLK_MAX_CDB);
+ rq->sense = h->sense;
+ memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
+ rq->sense_len = 0;
+
+ rq->cmd_type = REQ_TYPE_BLOCK_PC;
+ rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
+ rq->retries = RDAC_RETRIES;
+ rq->timeout = RDAC_TIMEOUT;
+ rq->end_io_data = act_req;
+
+ return rq;
+}
+
+static struct request *rdac_failover_get(struct request *act_req)
+{
+ struct request *rq;
+ struct rdac_mode_common *common;
+ unsigned data_size;
+ struct scsi_device *sdev = act_req->q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+
+ if (h->ctlr->use_10_ms) {
+ 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(act_req, &h->ctlr->mode_select, data_size, WRITE);
+ if (!rq)
+ return NULL;
+
+ /* Prepare the command. */
+ if (h->ctlr->use_10_ms) {
+ 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]);
+
+ return rq;
+}
+
+/* Acquires h->ctlr->lock */
+static void submit_mode_select(struct request *act_req)
+{
+ struct request *rq;
+ struct request_queue *q = act_req->q;
+ struct scsi_device *sdev = q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+
+ spin_lock(&h->ctlr->lock);
+ if (h->ctlr->submitted) {
+ list_add(&h->entry, &h->ctlr->cmd_list);
+ goto drop_lock;
+ }
+
+ rq = rdac_failover_get(act_req);
+ if (!rq)
+ goto fail_path;
+
+ sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command");
+
+ blk_execute_rq_nowait(q, NULL, rq, 1, mode_select_endio);
+ h->ctlr->submitted = 1;
+ goto drop_lock;
+fail_path:
+ scsi_blk_linux_cmd_done(act_req, BLKERR_RES_TEMP_UNAVAIL);
+drop_lock:
+ spin_unlock(&h->ctlr->lock);
+}
+
+static void release_ctlr(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);
+ spin_lock_init(&ctlr->lock);
+ ctlr->submitted = 0;
+ ctlr->use_10_ms = -1;
+ INIT_LIST_HEAD(&ctlr->cmd_list);
+ list_add(&ctlr->node, &ctlr_list);
+done:
+ spin_unlock(&list_lock);
+ return ctlr;
+}
+
+static void c4_endio(struct request *req, int uptodate)
+{
+ struct request *act_req = req->end_io_data;
+ struct scsi_device *sdev = act_req->q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+ struct c4_inquiry *sp;
+ int result = req->errors;
+
+ __blk_put_request(req->q, req);
+ if (had_failures(result)) {
+ scsi_blk_linux_cmd_done(act_req, BLKERR_IO);
+ return;
+ }
+
+ sp = &h->inq.c4;
+
+ h->ctlr = get_controller(sp->subsys_id, sp->slot_id);
+
+ if (h->ctlr) {
+ h->cmd_to_send = SEND_C9_INQUIRY;
+ queue_work(rdac_wkqd, &h->work);
+ } else
+ scsi_blk_linux_cmd_done(act_req, BLKERR_RES_TEMP_UNAVAIL);
+}
+
+static void c2_endio(struct request *req, int uptodate)
+{
+ struct request *act_req = req->end_io_data;
+ struct scsi_device *sdev = act_req->q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+ struct c2_inquiry *sp;
+ int result = req->errors;
+
+ __blk_put_request(req->q, req);
+ if (had_failures(result)) {
+ scsi_blk_linux_cmd_done(act_req, BLKERR_IO);
+ return;
+ }
+
+ sp = &h->inq.c2;
+
+ /* If more than MODE6_MAX_LUN luns are supported, use mode select 10 */
+ if (sp->max_lun_supported >= MODE6_MAX_LUN)
+ h->ctlr->use_10_ms = 1;
+ else
+ h->ctlr->use_10_ms = 0;
+
+ h->cmd_to_send = SEND_MODE_SELECT;
+ queue_work(rdac_wkqd, &h->work);
+}
+
+static void c9_endio(struct request *req, int uptodate)
+{
+ struct request *act_req = req->end_io_data;
+ struct scsi_device *sdev = act_req->q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+ struct c9_inquiry *sp;
+ int result = req->errors;
+
+ __blk_put_request(req->q, req);
+ if (had_failures(result)) {
+ scsi_blk_linux_cmd_done(act_req, BLKERR_IO);
+ return;
+ }
+
+ /* We need to look at the sense keys here to take clear action.
+ * For now simple logic: If the host is in AVT mode or if controller
+ * owns the lun, return dm_pg_init_complete(), otherwise submit
+ * MODE SELECT.
+ */
+ sp = &h->inq.c9;
+
+ /* If in AVT mode, return success */
+ if ((sp->avte_cvp >> 7) == 0x1) {
+ scsi_blk_linux_cmd_done(act_req, BLKERR_OK);
+ return;
+ }
+
+ /* If the controller on this path owns the LUN, return success */
+ if (sp->avte_cvp & 0x1) {
+ scsi_blk_linux_cmd_done(act_req, BLKERR_OK);
+ return;
+ }
+
+ if (h->ctlr) {
+ if (h->ctlr->use_10_ms == -1)
+ h->cmd_to_send = SEND_C2_INQUIRY;
+ else
+ h->cmd_to_send = SEND_MODE_SELECT;
+ } else
+ h->cmd_to_send = SEND_C4_INQUIRY;
+ queue_work(rdac_wkqd, &h->work);
+}
+
+static void c8_endio(struct request *req, int uptodate)
+{
+ struct request *act_req = req->end_io_data;
+ struct scsi_device *sdev = act_req->q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+ struct c8_inquiry *sp;
+ int result = req->errors;
+
+ __blk_put_request(req->q, req);
+ if (had_failures(result)) {
+ scsi_blk_linux_cmd_done(act_req, BLKERR_IO);
+ return;
+ }
+
+ /* We need to look at the sense keys here to take clear action.
+ * For now simple logic: Get the lun from the inquiry page.
+ */
+ sp = &h->inq.c8;
+ h->lun = sp->lun[7]; /* currently it uses only one byte */
+ h->cmd_to_send = SEND_C9_INQUIRY;
+ queue_work(rdac_wkqd, &h->work);
+}
+
+static void submit_inquiry(struct request *act_req, int page_code,
+ unsigned int len, rq_end_io_fn endio)
+{
+ struct request *rq;
+ struct request_queue *q = act_req->q;
+ struct scsi_device *sdev = q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+
+ rq = get_rdac_req(act_req, &h->inq, len, READ);
+ if (!rq)
+ goto fail_path;
+
+ /* 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);
+ blk_execute_rq_nowait(q, NULL, rq, 1, endio);
+ return;
+
+fail_path:
+ scsi_blk_linux_cmd_done(act_req, BLKERR_IO);
+}
+
+static void service_wkq(struct work_struct *work)
+{
+ struct rdac_dh_data *h = container_of(work, struct rdac_dh_data, work);
+
+ switch (h->cmd_to_send) {
+ case SEND_C2_INQUIRY:
+ submit_inquiry(h->act_req, 0xC2,
+ sizeof(struct c2_inquiry), c2_endio);
+ break;
+ case SEND_C4_INQUIRY:
+ submit_inquiry(h->act_req, 0xC4,
+ sizeof(struct c4_inquiry), c4_endio);
+ break;
+ case SEND_C8_INQUIRY:
+ submit_inquiry(h->act_req, 0xC8,
+ sizeof(struct c8_inquiry), c8_endio);
+ break;
+ case SEND_C9_INQUIRY:
+ submit_inquiry(h->act_req, 0xC9,
+ sizeof(struct c9_inquiry), c9_endio);
+ break;
+ case SEND_MODE_SELECT:
+ submit_mode_select(h->act_req);
+ break;
+ default:
+ BUG();
+ }
+}
+
+static int rdac_check_sense(struct scsi_device *sdev,
+ struct scsi_sense_hdr *sense_hdr)
+{
+ switch (sense_hdr->sense_key) {
+ case NOT_READY:
+#if 0
+ 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;
+#endif
+ 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.
+ */
+ scsi_device_set_state(sdev, SDEV_PASSIVE);
+ 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 SUCCESS;
+}
+
+static void rdac_transition(struct request *act_req)
+{
+ struct scsi_device *sdev = act_req->q->queuedata;
+ struct rdac_dh_data *h = sdev->sdev_dh_data;
+
+ h->act_req = act_req;
+ switch (h->lun) {
+ case UNINITIALIZED_LUN:
+ submit_inquiry(h->act_req, 0xC8, sizeof(struct c8_inquiry),
+ c8_endio);
+ break;
+ default:
+ submit_inquiry(h->act_req, 0xC9, sizeof(struct c9_inquiry),
+ c9_endio);
+ }
+}
+
+static const struct {
+ char *vendor;
+ char *model;
+} rdac_dev_list[] = {
+ {"IBM", "1815"},
+ {NULL, NULL},
+};
+
+static int rdac_bus_notify(struct notifier_block *, unsigned long, void *);
+
+static struct scsi_device_handler rdac_dh = {
+ .name = RDAC_NAME,
+ .module = THIS_MODULE,
+ .nb.notifier_call = rdac_bus_notify,
+ .check_sense = rdac_check_sense,
+ .transition = rdac_transition,
+};
+
+/*
+ * TODO: need some interface so we can set trespass values
+ */
+static int rdac_bus_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *dev = data;
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct rdac_dh_data *dh_data;
+ int i, found = 0;
+ unsigned long flags;
+
+ if (action == BUS_NOTIFY_ADD_DEVICE) {
+ for (i = 0; rdac_dev_list[i].vendor; i++) {
+ if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
+ strlen(rdac_dev_list[i].vendor)) &&
+ !strncmp(sdev->model, rdac_dev_list[i].model,
+ strlen(rdac_dev_list[i].model))) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ goto out;
+
+ dh_data = kzalloc(sizeof(*dh_data), GFP_KERNEL);
+ if (!dh_data) {
+ sdev_printk(KERN_ERR, sdev, "Attach failed %s.\n",
+ RDAC_NAME);
+ goto out;
+ }
+
+ dh_data->lun = UNINITIALIZED_LUN;
+ INIT_WORK(&dh_data->work, service_wkq);
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ sdev->sdev_dh_data = dh_data;
+ sdev->sdev_dh = &rdac_dh;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", RDAC_NAME);
+
+ } else if (action == BUS_NOTIFY_DEL_DEVICE) {
+ if (sdev->sdev_dh != &rdac_dh)
+ goto out;
+
+ spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
+ dh_data = sdev->sdev_dh_data;
+ sdev->sdev_dh_data = NULL;
+ sdev->sdev_dh = NULL;
+ spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+
+ if (dh_data->ctlr)
+ kref_put(&dh_data->ctlr->kref, release_ctlr);
+ kfree(dh_data);
+ sdev_printk(KERN_NOTICE, sdev, "Dettached %s.\n",
+ RDAC_NAME);
+ }
+
+out:
+ return 0;
+}
+
+static int __init rdac_init(void)
+{
+ int r;
+
+ rdac_wkqd = create_singlethread_workqueue("rdac_wkqd");
+ if (!rdac_wkqd) {
+ printk(KERN_ERR "Failed to create workqueue rdac_wkqd.");
+ return -ENOMEM;
+ }
+
+ r = scsi_register_device_handler(&rdac_dh);
+ if (r != 0) {
+ destroy_workqueue(rdac_wkqd);
+ printk(KERN_ERR "Failed to register scsi device handler.");
+ }
+ return r;
+}
+
+static void __exit rdac_exit(void)
+{
+ scsi_unregister_device_handler(&rdac_dh);
+ destroy_workqueue(rdac_wkqd);
+}
+
+module_init(rdac_init);
+module_exit(rdac_exit);
+
+MODULE_DESCRIPTION("Multipath LSI/Engenio RDAC driver");
+MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
+MODULE_LICENSE("GPL");
--
----------------------------------------------------------------------
Chandra Seetharaman | Be careful what you choose....
- sekharan@xxxxxxxxxx | .......you may get it.
----------------------------------------------------------------------
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