/* * Target driver for EMC CLARiiON AX/CX-series hardware. * Based on code from Lars Marowsky-Bree * and Ed Goggin . * * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * Copyright (C) 2006 Mike Christie * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #define CLARIION_NAME "emc" #define CLARIION_TRESPASS_PAGE 0x22 #define CLARIION_BUFFER_SIZE 0xFC #define CLARIION_TIMEOUT (60 * HZ) #define CLARIION_RETRIES 3 #define CLARIION_UNBOUND_LU -1 #define CLARIION_SP_A 0 #define CLARIION_SP_B 1 /* Flags */ #define CLARIION_SHORT_TRESPASS 1 #define CLARIION_HONOR_RESERVATIONS 2 /* LUN states */ #define CLARIION_LUN_UNINITIALIZED -1 #define CLARIION_LUN_UNBOUND 0 #define CLARIION_LUN_BOUND 1 #define CLARIION_LUN_OWNED 2 static unsigned char long_trespass[] = { 0, 0, 0, 0, 0, 0, 0, 0, CLARIION_TRESPASS_PAGE, /* Page code */ 0x09, /* Page length - 2 */ 0x01, /* Trespass code */ 0xff, 0xff, /* Trespass target */ 0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */ }; static unsigned char short_trespass[] = { 0, 0, 0, 0, CLARIION_TRESPASS_PAGE, /* Page code */ 0x02, /* Page length - 2 */ 0x01, /* Trespass code */ 0xff, /* Trespass target */ }; static const char * lun_state[] = { "not bound", "bound", "owned", }; struct clariion_dh_data { /* * Flags: * CLARIION_SHORT_TRESPASS * Use short trespass command (FC-series) or the long version * (default for AX/CX CLARiiON arrays). * * CLARIION_HONOR_RESERVATIONS * Whether or not (default) to honor SCSI reservations when * initiating a switch-over. */ unsigned flags; /* * I/O buffer for both MODE_SELECT and INQUIRY commands. */ unsigned char buffer[CLARIION_BUFFER_SIZE]; /* * SCSI sense buffer for commands -- assumes serial issuance * and completion sequence of all commands for same multipath. */ unsigned char sense[SCSI_SENSE_BUFFERSIZE]; unsigned int senselen; /* * LUN state */ int lun_state; /* * SP Port number */ int port; /* * which SP (A=0,B=1,UNBOUND=-1) is the default SP for this * path's mapped LUN */ int default_sp; /* * which SP (A=0,B=1,UNBOUND=-1) is the active SP for this * path's mapped LUN */ int current_sp; }; static inline struct clariion_dh_data *get_clariion_data(struct scsi_device *sdev) { struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data; BUG_ON(scsi_dh_data == NULL); return ((struct clariion_dh_data *) scsi_dh_data->buf); } /* * Parse MODE_SELECT cmd reply. */ static int trespass_endio(struct scsi_device *sdev, char *sense) { int err = SCSI_DH_IO; struct scsi_sense_hdr sshdr; if (!scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) { sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, " "0x%2x, 0x%2x while sending CLARiiON trespass " "command.\n", CLARIION_NAME, sshdr.sense_key, sshdr.asc, sshdr.ascq); if ((sshdr.sense_key == 0x05) && (sshdr.asc == 0x04) && (sshdr.ascq == 0x00)) { /* * Array based copy in progress -- do not send * mode_select or copy will be aborted mid-stream. */ sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in " "progress while sending CLARiiON trespass " "command.\n", CLARIION_NAME); err = SCSI_DH_DEV_TEMP_BUSY; } else if ((sshdr.sense_key == 0x02) && (sshdr.asc == 0x04) && (sshdr.ascq == 0x03)) { /* * LUN Not Ready - Manual Intervention Required * indicates in-progress ucode upgrade (NDU). */ sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress " "ucode upgrade NDU operation while sending " "CLARiiON trespass command.\n", CLARIION_NAME); err = SCSI_DH_DEV_TEMP_BUSY; } else err = SCSI_DH_DEV_FAILED; } else { sdev_printk(KERN_INFO, sdev, "%s: failed to send MODE SELECT, no sense available\n", CLARIION_NAME); } return err; } static int parse_sp_info_reply(struct scsi_device *sdev, struct clariion_dh_data *csdev) { int err = SCSI_DH_OK; /* check for in-progress ucode upgrade (NDU) */ if (csdev->buffer[48] != 0) { sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress " "ucode upgrade NDU operation while finding " "current active SP.", CLARIION_NAME); err = SCSI_DH_DEV_TEMP_BUSY; goto out; } if (csdev->buffer[4] > 2) { /* Invalid buffer format */ sdev_printk(KERN_NOTICE, sdev, "%s: invalid VPD page 0xC0 format\n", CLARIION_NAME); err = SCSI_DH_NOSYS; goto out; } switch (csdev->buffer[28] & 0x0f) { case 6: sdev_printk(KERN_NOTICE, sdev, "%s: ALUA failover mode detected\n", CLARIION_NAME); break; case 4: /* Linux failover */ break; default: sdev_printk(KERN_WARNING, sdev, "%s: Invalid failover mode %d\n", CLARIION_NAME, csdev->buffer[28] & 0x0f); err = SCSI_DH_NOSYS; goto out; } csdev->default_sp = csdev->buffer[5]; csdev->lun_state = csdev->buffer[4]; csdev->current_sp = csdev->buffer[8]; csdev->port = csdev->buffer[7]; out: return err; } #define emc_default_str "FC (Legacy)" static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer) { unsigned char len = buffer[4] + 5; char *sp_model = NULL; unsigned char sp_len, serial_len; if (len < 160) { sdev_printk(KERN_WARNING, sdev, "%s: Invalid information section length %d\n", CLARIION_NAME, len); /* Check for old FC arrays */ if (!strncmp(buffer + 8, "DGC", 3)) { /* Old FC array, not supporting extended information */ sp_model = emc_default_str; } goto out; } /* * Parse extended information for SP model number */ serial_len = buffer[160]; if (serial_len == 0 || serial_len + 161 > len) { sdev_printk(KERN_WARNING, sdev, "%s: Invalid array serial number length %d\n", CLARIION_NAME, serial_len); goto out; } sp_len = buffer[99]; if (sp_len == 0 || serial_len + sp_len + 161 > len) { sdev_printk(KERN_WARNING, sdev, "%s: Invalid model number length %d\n", CLARIION_NAME, sp_len); goto out; } sp_model = &buffer[serial_len + 161]; /* Strip whitespace at the end */ while (sp_len > 1 && sp_model[sp_len - 1] == ' ') sp_len--; sp_model[sp_len] = '\0'; out: return sp_model; } /* * Get block request for REQ_BLOCK_PC command issued to path. Currently * limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands. * * Uses data and sense buffers in hardware handler context structure and * assumes serial servicing of commands, both issuance and completion. */ static struct request *get_req(struct scsi_device *sdev, int cmd, unsigned char *buffer) { struct request *rq; int len = 0; rq = blk_get_request(sdev->request_queue, (cmd != INQUIRY) ? WRITE : READ, GFP_NOIO); if (IS_ERR(rq)) { sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed"); return NULL; } blk_rq_set_block_pc(rq); rq->cmd_len = COMMAND_SIZE(cmd); rq->cmd[0] = cmd; switch (cmd) { case MODE_SELECT: len = sizeof(short_trespass); rq->cmd[1] = 0x10; rq->cmd[4] = len; break; case MODE_SELECT_10: len = sizeof(long_trespass); rq->cmd[1] = 0x10; rq->cmd[8] = len; break; case INQUIRY: len = CLARIION_BUFFER_SIZE; rq->cmd[4] = len; memset(buffer, 0, len); break; default: BUG_ON(1); break; } rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER; rq->timeout = CLARIION_TIMEOUT; rq->retries = CLARIION_RETRIES; if (blk_rq_map_kern(rq->q, rq, buffer, len, GFP_NOIO)) { blk_put_request(rq); return NULL; } return rq; } static int send_inquiry_cmd(struct scsi_device *sdev, int page, struct clariion_dh_data *csdev) { struct request *rq = get_req(sdev, INQUIRY, csdev->buffer); int err; if (!rq) return SCSI_DH_RES_TEMP_UNAVAIL; rq->sense = csdev->sense; memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); rq->sense_len = csdev->senselen = 0; rq->cmd[0] = INQUIRY; if (page != 0) { rq->cmd[1] = 1; rq->cmd[2] = page; } err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); if (err == -EIO) { sdev_printk(KERN_INFO, sdev, "%s: failed to send %s INQUIRY: %x\n", CLARIION_NAME, page?"EVPD":"standard", rq->errors); csdev->senselen = rq->sense_len; err = SCSI_DH_IO; } blk_put_request(rq); return err; } static int send_trespass_cmd(struct scsi_device *sdev, struct clariion_dh_data *csdev) { struct request *rq; unsigned char *page22; int err, len, cmd; if (csdev->flags & CLARIION_SHORT_TRESPASS) { page22 = short_trespass; if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) /* Set Honor Reservations bit */ page22[6] |= 0x80; len = sizeof(short_trespass); cmd = MODE_SELECT; } else { page22 = long_trespass; if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) /* Set Honor Reservations bit */ page22[10] |= 0x80; len = sizeof(long_trespass); cmd = MODE_SELECT_10; } BUG_ON((len > CLARIION_BUFFER_SIZE)); memcpy(csdev->buffer, page22, len); rq = get_req(sdev, cmd, csdev->buffer); if (!rq) return SCSI_DH_RES_TEMP_UNAVAIL; rq->sense = csdev->sense; memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE); rq->sense_len = csdev->senselen = 0; err = blk_execute_rq(sdev->request_queue, NULL, rq, 1); if (err == -EIO) { if (rq->sense_len) { err = trespass_endio(sdev, csdev->sense); } else { sdev_printk(KERN_INFO, sdev, "%s: failed to send MODE SELECT: %x\n", CLARIION_NAME, rq->errors); } } blk_put_request(rq); return err; } static int clariion_check_sense(struct scsi_device *sdev, struct scsi_sense_hdr *sense_hdr) { switch (sense_hdr->sense_key) { case NOT_READY: if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03) /* * LUN Not Ready - Manual Intervention Required * indicates this is a passive path. * * FIXME: However, if this is seen and EVPD C0 * indicates that this is due to a NDU in * progress, we should set FAIL_PATH too. * This indicates we might have to do a SCSI * inquiry in the end_io path. Ugh. * * Can return FAILED only when we want the error * recovery process to kick in. */ return SUCCESS; break; case ILLEGAL_REQUEST: if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01) /* * An array based copy is in progress. Do not * fail the path, do not bypass to another PG, * do not retry. Fail the IO immediately. * (Actually this is the same conclusion as in * the default handler, but lets make sure.) * * Can return FAILED only when we want the error * recovery process to kick in. */ return SUCCESS; break; case UNIT_ATTENTION: if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00) /* * Unit Attention Code. This is the first IO * to the new path, so just retry. */ return ADD_TO_MLQUEUE; break; } return SCSI_RETURN_NOT_HANDLED; } static int clariion_prep_fn(struct scsi_device *sdev, struct request *req) { struct clariion_dh_data *h = get_clariion_data(sdev); int ret = BLKPREP_OK; if (h->lun_state != CLARIION_LUN_OWNED) { ret = BLKPREP_KILL; req->cmd_flags |= REQ_QUIET; } return ret; } static int clariion_std_inquiry(struct scsi_device *sdev, struct clariion_dh_data *csdev) { int err; char *sp_model; err = send_inquiry_cmd(sdev, 0, csdev); if (err != SCSI_DH_OK && csdev->senselen) { struct scsi_sense_hdr sshdr; if (scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, &sshdr)) { sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " "%02x/%02x/%02x\n", CLARIION_NAME, sshdr.sense_key, sshdr.asc, sshdr.ascq); } err = SCSI_DH_IO; goto out; } sp_model = parse_sp_model(sdev, csdev->buffer); if (!sp_model) { err = SCSI_DH_DEV_UNSUPP; goto out; } /* * FC Series arrays do not support long trespass */ if (!strlen(sp_model) || !strncmp(sp_model, "FC",2)) csdev->flags |= CLARIION_SHORT_TRESPASS; sdev_printk(KERN_INFO, sdev, "%s: detected Clariion %s, flags %x\n", CLARIION_NAME, sp_model, csdev->flags); out: return err; } static int clariion_send_inquiry(struct scsi_device *sdev, struct clariion_dh_data *csdev) { int err, retry = CLARIION_RETRIES; retry: err = send_inquiry_cmd(sdev, 0xC0, csdev); if (err != SCSI_DH_OK && csdev->senselen) { struct scsi_sense_hdr sshdr; err = scsi_normalize_sense(csdev->sense, SCSI_SENSE_BUFFERSIZE, &sshdr); if (!err) return SCSI_DH_IO; err = clariion_check_sense(sdev, &sshdr); if (retry > 0 && err == ADD_TO_MLQUEUE) { retry--; goto retry; } sdev_printk(KERN_ERR, sdev, "%s: INQUIRY sense code " "%02x/%02x/%02x\n", CLARIION_NAME, sshdr.sense_key, sshdr.asc, sshdr.ascq); err = SCSI_DH_IO; } else { err = parse_sp_info_reply(sdev, csdev); } return err; } static int clariion_activate(struct scsi_device *sdev, activate_complete fn, void *data) { struct clariion_dh_data *csdev = get_clariion_data(sdev); int result; result = clariion_send_inquiry(sdev, csdev); if (result != SCSI_DH_OK) goto done; if (csdev->lun_state == CLARIION_LUN_OWNED) goto done; result = send_trespass_cmd(sdev, csdev); if (result != SCSI_DH_OK) goto done; sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n", CLARIION_NAME, csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" ); /* Update status */ result = clariion_send_inquiry(sdev, csdev); if (result != SCSI_DH_OK) goto done; done: sdev_printk(KERN_INFO, sdev, "%s: at SP %c Port %d (%s, default SP %c)\n", CLARIION_NAME, csdev->current_sp + 'A', csdev->port, lun_state[csdev->lun_state], csdev->default_sp + 'A'); if (fn) fn(data, result); return 0; } /* * params - parameters in the following format * "no_of_params\0param1\0param2\0param3\0...\0" * for example, string for 2 parameters with value 10 and 21 * is specified as "2\010\021\0". */ static int clariion_set_params(struct scsi_device *sdev, const char *params) { struct clariion_dh_data *csdev = get_clariion_data(sdev); unsigned int hr = 0, st = 0, argc; const char *p = params; int result = SCSI_DH_OK; if ((sscanf(params, "%u", &argc) != 1) || (argc != 2)) return -EINVAL; while (*p++) ; if ((sscanf(p, "%u", &st) != 1) || (st > 1)) return -EINVAL; while (*p++) ; if ((sscanf(p, "%u", &hr) != 1) || (hr > 1)) return -EINVAL; if (st) csdev->flags |= CLARIION_SHORT_TRESPASS; else csdev->flags &= ~CLARIION_SHORT_TRESPASS; if (hr) csdev->flags |= CLARIION_HONOR_RESERVATIONS; else csdev->flags &= ~CLARIION_HONOR_RESERVATIONS; /* * If this path is owned, we have to send a trespass command * with the new parameters. If not, simply return. Next trespass * command would use the parameters. */ if (csdev->lun_state != CLARIION_LUN_OWNED) goto done; csdev->lun_state = CLARIION_LUN_UNINITIALIZED; result = send_trespass_cmd(sdev, csdev); if (result != SCSI_DH_OK) goto done; /* Update status */ result = clariion_send_inquiry(sdev, csdev); done: return result; } static const struct scsi_dh_devlist clariion_dev_list[] = { {"DGC", "RAID"}, {"DGC", "DISK"}, {"DGC", "VRAID"}, {NULL, NULL}, }; static bool clariion_match(struct scsi_device *sdev) { int i; if (scsi_device_tpgs(sdev)) return false; for (i = 0; clariion_dev_list[i].vendor; i++) { if (!strncmp(sdev->vendor, clariion_dev_list[i].vendor, strlen(clariion_dev_list[i].vendor)) && !strncmp(sdev->model, clariion_dev_list[i].model, strlen(clariion_dev_list[i].model))) { return true; } } return false; } static int clariion_bus_attach(struct scsi_device *sdev); static void clariion_bus_detach(struct scsi_device *sdev); static struct scsi_device_handler clariion_dh = { .name = CLARIION_NAME, .module = THIS_MODULE, .devlist = clariion_dev_list, .attach = clariion_bus_attach, .detach = clariion_bus_detach, .check_sense = clariion_check_sense, .activate = clariion_activate, .prep_fn = clariion_prep_fn, .set_params = clariion_set_params, .match = clariion_match, }; static int clariion_bus_attach(struct scsi_device *sdev) { struct scsi_dh_data *scsi_dh_data; struct clariion_dh_data *h; unsigned long flags; int err; scsi_dh_data = kzalloc(sizeof(*scsi_dh_data) + sizeof(*h) , GFP_KERNEL); if (!scsi_dh_data) { sdev_printk(KERN_ERR, sdev, "%s: Attach failed\n", CLARIION_NAME); return -ENOMEM; } scsi_dh_data->scsi_dh = &clariion_dh; h = (struct clariion_dh_data *) scsi_dh_data->buf; h->lun_state = CLARIION_LUN_UNINITIALIZED; h->default_sp = CLARIION_UNBOUND_LU; h->current_sp = CLARIION_UNBOUND_LU; err = clariion_std_inquiry(sdev, h); if (err != SCSI_DH_OK) goto failed; err = clariion_send_inquiry(sdev, h); if (err != SCSI_DH_OK) goto failed; 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_INFO, sdev, "%s: connected to SP %c Port %d (%s, default SP %c)\n", CLARIION_NAME, h->current_sp + 'A', h->port, lun_state[h->lun_state], h->default_sp + 'A'); return 0; failed: kfree(scsi_dh_data); sdev_printk(KERN_ERR, sdev, "%s: not attached\n", CLARIION_NAME); return -EINVAL; } static void clariion_bus_detach(struct scsi_device *sdev) { struct scsi_dh_data *scsi_dh_data; 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); sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", CLARIION_NAME); kfree(scsi_dh_data); } static int __init clariion_init(void) { int r; r = scsi_register_device_handler(&clariion_dh); if (r != 0) printk(KERN_ERR "%s: Failed to register scsi device handler.", CLARIION_NAME); return r; } static void __exit clariion_exit(void) { scsi_unregister_device_handler(&clariion_dh); } module_init(clariion_init); module_exit(clariion_exit); MODULE_DESCRIPTION("EMC CX/AX/FC-family driver"); MODULE_AUTHOR("Mike Christie , Chandra Seetharaman "); MODULE_LICENSE("GPL");