summaryrefslogtreecommitdiff
path: root/drivers/md/dm-mpath-rdac.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/md/dm-mpath-rdac.c')
-rw-r--r--drivers/md/dm-mpath-rdac.c700
1 files changed, 0 insertions, 700 deletions
diff --git a/drivers/md/dm-mpath-rdac.c b/drivers/md/dm-mpath-rdac.c
deleted file mode 100644
index 95e77734880a..000000000000
--- a/drivers/md/dm-mpath-rdac.c
+++ /dev/null
@@ -1,700 +0,0 @@
-/*
- * Engenio/LSI RDAC DM HW 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 <scsi/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_eh.h>
-
-#define DM_MSG_PREFIX "multipath rdac"
-
-#include "dm.h"
-#include "dm-hw-handler.h"
-
-#define RDAC_DM_HWH_NAME "rdac"
-#define RDAC_DM_HWH_VER "0.4"
-
-/*
- * 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_FAILOVER_TIMEOUT (60 * HZ)
-
-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_handler {
- struct list_head entry; /* list waiting to submit MODE SELECT */
- unsigned timeout;
- struct rdac_controller *ctlr;
-#define UNINITIALIZED_LUN (1 << 8)
- unsigned lun;
- unsigned char sense[SCSI_SENSE_BUFFERSIZE];
- struct dm_path *path;
- 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(struct request *req, int error)
-{
- return (error || host_byte(req->errors) != DID_OK ||
- msg_byte(req->errors) != COMMAND_COMPLETE);
-}
-
-static void rdac_resubmit_all(struct rdac_handler *h)
-{
- struct rdac_controller *ctlr = h->ctlr;
- struct rdac_handler *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 error)
-{
- struct rdac_handler *h = req->end_io_data;
- struct scsi_sense_hdr sense_hdr;
- int sense = 0, fail = 0;
-
- if (had_failures(req, error)) {
- fail = 1;
- goto failed;
- }
-
- if (status_byte(req->errors) == 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
- */
- h->cmd_to_send = SEND_C9_INQUIRY;
- queue_work(rdac_wkqd, &h->work);
- goto done;
- }
- if (sense)
- DMINFO("MODE_SELECT failed on %s with sense 0x%x",
- h->path->dev->name, sense);
- }
-failed:
- if (fail || sense)
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
- else
- dm_pg_init_complete(h->path, 0);
-
-done:
- rdac_resubmit_all(h);
- __blk_put_request(req->q, req);
-}
-
-static struct request *get_rdac_req(struct rdac_handler *h,
- void *buffer, unsigned buflen, int rw)
-{
- struct request *rq;
- struct request_queue *q = bdev_get_queue(h->path->dev->bdev);
-
- rq = blk_get_request(q, rw, GFP_KERNEL);
-
- if (!rq) {
- DMINFO("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);
- DMINFO("get_rdac_req: blk_rq_map_kern failed");
- return NULL;
- }
-
- rq->sense = h->sense;
- memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
- rq->sense_len = 0;
-
- rq->end_io_data = h;
- rq->timeout = h->timeout;
- rq->cmd_type = REQ_TYPE_BLOCK_PC;
- rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
- return rq;
-}
-
-static struct request *rdac_failover_get(struct rdac_handler *h)
-{
- struct request *rq;
- struct rdac_mode_common *common;
- unsigned data_size;
-
- 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(h, &h->ctlr->mode_select, data_size, WRITE);
- if (!rq) {
- DMERR("rdac_failover_get: no 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 rdac_handler *h)
-{
- struct request *rq;
- struct request_queue *q = bdev_get_queue(h->path->dev->bdev);
-
- spin_lock(&h->ctlr->lock);
- if (h->ctlr->submitted) {
- list_add(&h->entry, &h->ctlr->cmd_list);
- goto drop_lock;
- }
-
- if (!q) {
- DMINFO("submit_mode_select: no queue");
- goto fail_path;
- }
-
- rq = rdac_failover_get(h);
- if (!rq) {
- DMERR("submit_mode_select: no rq");
- goto fail_path;
- }
-
- DMINFO("queueing MODE_SELECT command on %s", h->path->dev->name);
-
- blk_execute_rq_nowait(q, NULL, rq, 1, mode_select_endio);
- h->ctlr->submitted = 1;
- goto drop_lock;
-fail_path:
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
-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 error)
-{
- struct rdac_handler *h = req->end_io_data;
- struct c4_inquiry *sp;
-
- if (had_failures(req, error)) {
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
- goto done;
- }
-
- 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
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
-done:
- __blk_put_request(req->q, req);
-}
-
-static void c2_endio(struct request *req, int error)
-{
- struct rdac_handler *h = req->end_io_data;
- struct c2_inquiry *sp;
-
- if (had_failures(req, error)) {
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
- goto done;
- }
-
- 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);
-done:
- __blk_put_request(req->q, req);
-}
-
-static void c9_endio(struct request *req, int error)
-{
- struct rdac_handler *h = req->end_io_data;
- struct c9_inquiry *sp;
-
- if (had_failures(req, error)) {
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
- goto done;
- }
-
- /* 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) {
- dm_pg_init_complete(h->path, 0);
- goto done;
- }
-
- /* If the controller on this path owns the LUN, return success */
- if (sp->avte_cvp & 0x1) {
- dm_pg_init_complete(h->path, 0);
- goto done;
- }
-
- 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);
-done:
- __blk_put_request(req->q, req);
-}
-
-static void c8_endio(struct request *req, int error)
-{
- struct rdac_handler *h = req->end_io_data;
- struct c8_inquiry *sp;
-
- if (had_failures(req, error)) {
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
- goto done;
- }
-
- /* 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);
-done:
- __blk_put_request(req->q, req);
-}
-
-static void submit_inquiry(struct rdac_handler *h, int page_code,
- unsigned int len, rq_end_io_fn endio)
-{
- struct request *rq;
- struct request_queue *q = bdev_get_queue(h->path->dev->bdev);
-
- if (!q)
- goto fail_path;
-
- rq = get_rdac_req(h, &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:
- dm_pg_init_complete(h->path, MP_FAIL_PATH);
-}
-
-static void service_wkq(struct work_struct *work)
-{
- struct rdac_handler *h = container_of(work, struct rdac_handler, work);
-
- switch (h->cmd_to_send) {
- case SEND_C2_INQUIRY:
- submit_inquiry(h, 0xC2, sizeof(struct c2_inquiry), c2_endio);
- break;
- case SEND_C4_INQUIRY:
- submit_inquiry(h, 0xC4, sizeof(struct c4_inquiry), c4_endio);
- break;
- case SEND_C8_INQUIRY:
- submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio);
- break;
- case SEND_C9_INQUIRY:
- submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio);
- break;
- case SEND_MODE_SELECT:
- submit_mode_select(h);
- break;
- default:
- BUG();
- }
-}
-/*
- * only support subpage2c until we confirm that this is just a matter of
- * of updating firmware or not, and RDAC (basic AVT works already) for now
- * but we can add these in in when we get time and testers
- */
-static int rdac_create(struct hw_handler *hwh, unsigned argc, char **argv)
-{
- struct rdac_handler *h;
- unsigned timeout;
-
- if (argc == 0) {
- /* No arguments: use defaults */
- timeout = RDAC_FAILOVER_TIMEOUT;
- } else if (argc != 1) {
- DMWARN("incorrect number of arguments");
- return -EINVAL;
- } else {
- if (sscanf(argv[1], "%u", &timeout) != 1) {
- DMWARN("invalid timeout value");
- return -EINVAL;
- }
- }
-
- h = kzalloc(sizeof(*h), GFP_KERNEL);
- if (!h)
- return -ENOMEM;
-
- hwh->context = h;
- h->timeout = timeout;
- h->lun = UNINITIALIZED_LUN;
- INIT_WORK(&h->work, service_wkq);
- DMWARN("using RDAC command with timeout %u", h->timeout);
-
- return 0;
-}
-
-static void rdac_destroy(struct hw_handler *hwh)
-{
- struct rdac_handler *h = hwh->context;
-
- if (h->ctlr)
- kref_put(&h->ctlr->kref, release_ctlr);
- kfree(h);
- hwh->context = NULL;
-}
-
-static unsigned rdac_error(struct hw_handler *hwh, struct bio *bio)
-{
- /* Try default handler */
- return dm_scsi_err_handler(hwh, bio);
-}
-
-static void rdac_pg_init(struct hw_handler *hwh, unsigned bypassed,
- struct dm_path *path)
-{
- struct rdac_handler *h = hwh->context;
-
- h->path = path;
- switch (h->lun) {
- case UNINITIALIZED_LUN:
- submit_inquiry(h, 0xC8, sizeof(struct c8_inquiry), c8_endio);
- break;
- default:
- submit_inquiry(h, 0xC9, sizeof(struct c9_inquiry), c9_endio);
- }
-}
-
-static struct hw_handler_type rdac_handler = {
- .name = RDAC_DM_HWH_NAME,
- .module = THIS_MODULE,
- .create = rdac_create,
- .destroy = rdac_destroy,
- .pg_init = rdac_pg_init,
- .error = rdac_error,
-};
-
-static int __init rdac_init(void)
-{
- int r;
-
- rdac_wkqd = create_singlethread_workqueue("rdac_wkqd");
- if (!rdac_wkqd) {
- DMERR("Failed to create workqueue rdac_wkqd.");
- return -ENOMEM;
- }
-
- r = dm_register_hw_handler(&rdac_handler);
- if (r < 0) {
- DMERR("%s: register failed %d", RDAC_DM_HWH_NAME, r);
- destroy_workqueue(rdac_wkqd);
- return r;
- }
-
- DMINFO("%s: version %s loaded", RDAC_DM_HWH_NAME, RDAC_DM_HWH_VER);
- return 0;
-}
-
-static void __exit rdac_exit(void)
-{
- int r = dm_unregister_hw_handler(&rdac_handler);
-
- destroy_workqueue(rdac_wkqd);
- if (r < 0)
- DMERR("%s: unregister failed %d", RDAC_DM_HWH_NAME, r);
-}
-
-module_init(rdac_init);
-module_exit(rdac_exit);
-
-MODULE_DESCRIPTION("DM Multipath LSI/Engenio RDAC support");
-MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(RDAC_DM_HWH_VER);