704 lines
16 KiB
C
704 lines
16 KiB
C
/*
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* Engenio/LSI RDAC SCSI Device Handler
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*
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* Copyright (C) 2005 Mike Christie. All rights reserved.
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* Copyright (C) Chandra Seetharaman, IBM Corp. 2007
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <scsi/scsi.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dh.h>
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#define RDAC_NAME "rdac"
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/*
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* LSI mode page stuff
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*
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* These struct definitions and the forming of the
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* mode page were taken from the LSI RDAC 2.4 GPL'd
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* driver, and then converted to Linux conventions.
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*/
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#define RDAC_QUIESCENCE_TIME 20;
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/*
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* Page Codes
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*/
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#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
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/*
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* Controller modes definitions
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*/
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#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
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/*
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* RDAC Options field
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*/
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#define RDAC_FORCED_QUIESENCE 0x02
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#define RDAC_TIMEOUT (60 * HZ)
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#define RDAC_RETRIES 3
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struct rdac_mode_6_hdr {
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u8 data_len;
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u8 medium_type;
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u8 device_params;
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u8 block_desc_len;
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};
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struct rdac_mode_10_hdr {
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u16 data_len;
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u8 medium_type;
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u8 device_params;
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u16 reserved;
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u16 block_desc_len;
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};
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struct rdac_mode_common {
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u8 controller_serial[16];
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u8 alt_controller_serial[16];
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u8 rdac_mode[2];
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u8 alt_rdac_mode[2];
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u8 quiescence_timeout;
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u8 rdac_options;
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};
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struct rdac_pg_legacy {
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struct rdac_mode_6_hdr hdr;
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u8 page_code;
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u8 page_len;
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struct rdac_mode_common common;
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#define MODE6_MAX_LUN 32
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u8 lun_table[MODE6_MAX_LUN];
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u8 reserved2[32];
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u8 reserved3;
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u8 reserved4;
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};
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struct rdac_pg_expanded {
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struct rdac_mode_10_hdr hdr;
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u8 page_code;
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u8 subpage_code;
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u8 page_len[2];
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struct rdac_mode_common common;
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u8 lun_table[256];
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u8 reserved3;
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u8 reserved4;
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};
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struct c9_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC9 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "vace" */
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u8 avte_cvp;
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u8 path_prio;
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u8 reserved2[38];
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};
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#define SUBSYS_ID_LEN 16
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#define SLOT_ID_LEN 2
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struct c4_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC4 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "subs" */
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u8 subsys_id[SUBSYS_ID_LEN];
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u8 revision[4];
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u8 slot_id[SLOT_ID_LEN];
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u8 reserved[2];
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};
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struct rdac_controller {
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u8 subsys_id[SUBSYS_ID_LEN];
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u8 slot_id[SLOT_ID_LEN];
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int use_ms10;
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struct kref kref;
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struct list_head node; /* list of all controllers */
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union {
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struct rdac_pg_legacy legacy;
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struct rdac_pg_expanded expanded;
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} mode_select;
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};
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struct c8_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC8 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "edid" */
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u8 reserved2[3];
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u8 vol_uniq_id_len;
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u8 vol_uniq_id[16];
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u8 vol_user_label_len;
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u8 vol_user_label[60];
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u8 array_uniq_id_len;
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u8 array_unique_id[16];
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u8 array_user_label_len;
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u8 array_user_label[60];
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u8 lun[8];
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};
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struct c2_inquiry {
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u8 peripheral_info;
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u8 page_code; /* 0xC2 */
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u8 reserved1;
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u8 page_len;
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u8 page_id[4]; /* "swr4" */
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u8 sw_version[3];
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u8 sw_date[3];
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u8 features_enabled;
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u8 max_lun_supported;
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u8 partitions[239]; /* Total allocation length should be 0xFF */
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};
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struct rdac_dh_data {
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struct rdac_controller *ctlr;
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#define UNINITIALIZED_LUN (1 << 8)
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unsigned lun;
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#define RDAC_STATE_ACTIVE 0
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#define RDAC_STATE_PASSIVE 1
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unsigned char state;
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#define RDAC_LUN_UNOWNED 0
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#define RDAC_LUN_OWNED 1
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#define RDAC_LUN_AVT 2
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char lun_state;
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unsigned char sense[SCSI_SENSE_BUFFERSIZE];
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union {
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struct c2_inquiry c2;
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struct c4_inquiry c4;
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struct c8_inquiry c8;
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struct c9_inquiry c9;
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} inq;
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};
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static const char *lun_state[] =
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{
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"unowned",
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"owned",
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"owned (AVT mode)",
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};
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static LIST_HEAD(ctlr_list);
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static DEFINE_SPINLOCK(list_lock);
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static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
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{
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struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
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BUG_ON(scsi_dh_data == NULL);
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return ((struct rdac_dh_data *) scsi_dh_data->buf);
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}
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static struct request *get_rdac_req(struct scsi_device *sdev,
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void *buffer, unsigned buflen, int rw)
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{
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struct request *rq;
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struct request_queue *q = sdev->request_queue;
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rq = blk_get_request(q, rw, GFP_NOIO);
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if (!rq) {
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sdev_printk(KERN_INFO, sdev,
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"get_rdac_req: blk_get_request failed.\n");
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return NULL;
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}
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if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
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blk_put_request(rq);
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sdev_printk(KERN_INFO, sdev,
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"get_rdac_req: blk_rq_map_kern failed.\n");
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return NULL;
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}
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rq->cmd_type = REQ_TYPE_BLOCK_PC;
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rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
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REQ_FAILFAST_DRIVER;
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rq->retries = RDAC_RETRIES;
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rq->timeout = RDAC_TIMEOUT;
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return rq;
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}
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static struct request *rdac_failover_get(struct scsi_device *sdev,
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struct rdac_dh_data *h)
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{
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struct request *rq;
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struct rdac_mode_common *common;
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unsigned data_size;
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if (h->ctlr->use_ms10) {
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struct rdac_pg_expanded *rdac_pg;
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data_size = sizeof(struct rdac_pg_expanded);
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rdac_pg = &h->ctlr->mode_select.expanded;
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memset(rdac_pg, 0, data_size);
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common = &rdac_pg->common;
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rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
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rdac_pg->subpage_code = 0x1;
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rdac_pg->page_len[0] = 0x01;
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rdac_pg->page_len[1] = 0x28;
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rdac_pg->lun_table[h->lun] = 0x81;
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} else {
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struct rdac_pg_legacy *rdac_pg;
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data_size = sizeof(struct rdac_pg_legacy);
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rdac_pg = &h->ctlr->mode_select.legacy;
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memset(rdac_pg, 0, data_size);
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common = &rdac_pg->common;
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rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
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rdac_pg->page_len = 0x68;
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rdac_pg->lun_table[h->lun] = 0x81;
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}
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common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
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common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
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common->rdac_options = RDAC_FORCED_QUIESENCE;
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/* get request for block layer packet command */
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rq = get_rdac_req(sdev, &h->ctlr->mode_select, data_size, WRITE);
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if (!rq)
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return NULL;
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/* Prepare the command. */
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if (h->ctlr->use_ms10) {
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rq->cmd[0] = MODE_SELECT_10;
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rq->cmd[7] = data_size >> 8;
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rq->cmd[8] = data_size & 0xff;
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} else {
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rq->cmd[0] = MODE_SELECT;
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rq->cmd[4] = data_size;
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}
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rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
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rq->sense = h->sense;
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memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
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rq->sense_len = 0;
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return rq;
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}
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static void release_controller(struct kref *kref)
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{
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struct rdac_controller *ctlr;
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ctlr = container_of(kref, struct rdac_controller, kref);
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spin_lock(&list_lock);
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list_del(&ctlr->node);
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spin_unlock(&list_lock);
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kfree(ctlr);
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}
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static struct rdac_controller *get_controller(u8 *subsys_id, u8 *slot_id)
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{
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struct rdac_controller *ctlr, *tmp;
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spin_lock(&list_lock);
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list_for_each_entry(tmp, &ctlr_list, node) {
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if ((memcmp(tmp->subsys_id, subsys_id, SUBSYS_ID_LEN) == 0) &&
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(memcmp(tmp->slot_id, slot_id, SLOT_ID_LEN) == 0)) {
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kref_get(&tmp->kref);
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spin_unlock(&list_lock);
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return tmp;
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}
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}
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ctlr = kmalloc(sizeof(*ctlr), GFP_ATOMIC);
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if (!ctlr)
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goto done;
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/* initialize fields of controller */
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memcpy(ctlr->subsys_id, subsys_id, SUBSYS_ID_LEN);
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memcpy(ctlr->slot_id, slot_id, SLOT_ID_LEN);
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kref_init(&ctlr->kref);
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ctlr->use_ms10 = -1;
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list_add(&ctlr->node, &ctlr_list);
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done:
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spin_unlock(&list_lock);
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return ctlr;
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}
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static int submit_inquiry(struct scsi_device *sdev, int page_code,
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unsigned int len, struct rdac_dh_data *h)
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{
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struct request *rq;
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struct request_queue *q = sdev->request_queue;
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int err = SCSI_DH_RES_TEMP_UNAVAIL;
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rq = get_rdac_req(sdev, &h->inq, len, READ);
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if (!rq)
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goto done;
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/* Prepare the command. */
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rq->cmd[0] = INQUIRY;
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rq->cmd[1] = 1;
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rq->cmd[2] = page_code;
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rq->cmd[4] = len;
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rq->cmd_len = COMMAND_SIZE(INQUIRY);
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rq->sense = h->sense;
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memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
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rq->sense_len = 0;
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err = blk_execute_rq(q, NULL, rq, 1);
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if (err == -EIO)
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err = SCSI_DH_IO;
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blk_put_request(rq);
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done:
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return err;
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}
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static int get_lun(struct scsi_device *sdev, struct rdac_dh_data *h)
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{
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int err;
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struct c8_inquiry *inqp;
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err = submit_inquiry(sdev, 0xC8, sizeof(struct c8_inquiry), h);
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if (err == SCSI_DH_OK) {
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inqp = &h->inq.c8;
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if (inqp->page_code != 0xc8)
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return SCSI_DH_NOSYS;
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if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
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inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
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return SCSI_DH_NOSYS;
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h->lun = inqp->lun[7]; /* Uses only the last byte */
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}
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return err;
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}
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static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
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{
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int err;
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struct c9_inquiry *inqp;
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h->lun_state = RDAC_LUN_UNOWNED;
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err = submit_inquiry(sdev, 0xC9, sizeof(struct c9_inquiry), h);
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if (err == SCSI_DH_OK) {
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inqp = &h->inq.c9;
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if ((inqp->avte_cvp >> 7) == 0x1) {
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/* LUN in AVT mode */
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sdev_printk(KERN_NOTICE, sdev,
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"%s: AVT mode detected\n",
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RDAC_NAME);
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h->lun_state = RDAC_LUN_AVT;
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} else if ((inqp->avte_cvp & 0x1) != 0) {
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/* LUN was owned by the controller */
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h->lun_state = RDAC_LUN_OWNED;
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}
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}
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if (h->lun_state == RDAC_LUN_UNOWNED)
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h->state = RDAC_STATE_PASSIVE;
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return err;
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}
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static int initialize_controller(struct scsi_device *sdev,
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struct rdac_dh_data *h)
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{
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int err;
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struct c4_inquiry *inqp;
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err = submit_inquiry(sdev, 0xC4, sizeof(struct c4_inquiry), h);
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if (err == SCSI_DH_OK) {
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inqp = &h->inq.c4;
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h->ctlr = get_controller(inqp->subsys_id, inqp->slot_id);
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if (!h->ctlr)
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err = SCSI_DH_RES_TEMP_UNAVAIL;
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}
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return err;
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}
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static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
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{
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int err;
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struct c2_inquiry *inqp;
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err = submit_inquiry(sdev, 0xC2, sizeof(struct c2_inquiry), h);
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if (err == SCSI_DH_OK) {
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inqp = &h->inq.c2;
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/*
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* If more than MODE6_MAX_LUN luns are supported, use
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* mode select 10
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*/
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if (inqp->max_lun_supported >= MODE6_MAX_LUN)
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h->ctlr->use_ms10 = 1;
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else
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h->ctlr->use_ms10 = 0;
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}
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return err;
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}
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static int mode_select_handle_sense(struct scsi_device *sdev,
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unsigned char *sensebuf)
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{
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struct scsi_sense_hdr sense_hdr;
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int sense, err = SCSI_DH_IO, ret;
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ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
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if (!ret)
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goto done;
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err = SCSI_DH_OK;
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sense = (sense_hdr.sense_key << 16) | (sense_hdr.asc << 8) |
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sense_hdr.ascq;
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/* If it is retryable failure, submit the c9 inquiry again */
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if (sense == 0x59136 || sense == 0x68b02 || sense == 0xb8b02 ||
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sense == 0x62900) {
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/* 0x59136 - Command lock contention
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* 0x[6b]8b02 - Quiesense in progress or achieved
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* 0x62900 - Power On, Reset, or Bus Device Reset
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*/
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err = SCSI_DH_RETRY;
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}
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if (sense)
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sdev_printk(KERN_INFO, sdev,
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"MODE_SELECT failed with sense 0x%x.\n", sense);
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done:
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return err;
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}
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static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
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{
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struct request *rq;
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struct request_queue *q = sdev->request_queue;
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int err = SCSI_DH_RES_TEMP_UNAVAIL;
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rq = rdac_failover_get(sdev, h);
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if (!rq)
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goto done;
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sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command.\n");
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err = blk_execute_rq(q, NULL, rq, 1);
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if (err != SCSI_DH_OK)
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err = mode_select_handle_sense(sdev, h->sense);
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if (err == SCSI_DH_OK)
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h->state = RDAC_STATE_ACTIVE;
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blk_put_request(rq);
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done:
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return err;
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}
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static int rdac_activate(struct scsi_device *sdev)
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{
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struct rdac_dh_data *h = get_rdac_data(sdev);
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int err = SCSI_DH_OK;
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err = check_ownership(sdev, h);
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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->cmd_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 ADD_TO_MLQUEUE;
|
|
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 ADD_TO_MLQUEUE;
|
|
break;
|
|
}
|
|
/* success just means we do not care what scsi-ml does */
|
|
return SCSI_RETURN_NOT_HANDLED;
|
|
}
|
|
|
|
static 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"},
|
|
{"DELL", "MD3000"},
|
|
{"DELL", "MD3000i"},
|
|
{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,
|
|
};
|
|
|
|
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 0;
|
|
}
|
|
|
|
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);
|
|
sdev->scsi_dh_data = 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 = sdev->scsi_dh_data;
|
|
sdev->scsi_dh_data = 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: Detached\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");
|