Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Hannes Reinecke | 1002 | 49.58% | 6 | 26.09% |
Chandra Seetharaman | 919 | 45.47% | 3 | 13.04% |
Christoph Hellwig | 85 | 4.21% | 6 | 26.09% |
Paul Gortmaker | 3 | 0.15% | 1 | 4.35% |
Tejun Heo | 3 | 0.15% | 1 | 4.35% |
Bart Van Assche | 2 | 0.10% | 1 | 4.35% |
Dan Carpenter | 2 | 0.10% | 1 | 4.35% |
Thomas Gleixner | 2 | 0.10% | 1 | 4.35% |
Stephen Kitt | 1 | 0.05% | 1 | 4.35% |
Mike Anderson | 1 | 0.05% | 1 | 4.35% |
James Bottomley | 1 | 0.05% | 1 | 4.35% |
Total | 2021 | 23 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Target driver for EMC CLARiiON AX/CX-series hardware. * Based on code from Lars Marowsky-Bree <lmb@suse.de> * and Ed Goggin <egoggin@emc.com>. * * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * Copyright (C) 2006 Mike Christie */ #include <linux/slab.h> #include <linux/module.h> #include <scsi/scsi.h> #include <scsi/scsi_eh.h> #include <scsi/scsi_dh.h> #include <scsi/scsi_device.h> #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]; /* * 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; }; /* * Parse MODE_SELECT cmd reply. */ static int trespass_endio(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) { int err = SCSI_DH_IO; 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; 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]; if (csdev->lun_state == CLARIION_LUN_OWNED) sdev->access_state = SCSI_ACCESS_STATE_OPTIMAL; else sdev->access_state = SCSI_ACCESS_STATE_STANDBY; if (csdev->default_sp == csdev->current_sp) sdev->access_state |= SCSI_ACCESS_STATE_PREFERRED; 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; } static int send_trespass_cmd(struct scsi_device *sdev, struct clariion_dh_data *csdev) { unsigned char *page22; unsigned char cdb[MAX_COMMAND_SIZE]; int err, res = SCSI_DH_OK, len; struct scsi_sense_hdr sshdr; u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER; 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); cdb[0] = MODE_SELECT; cdb[1] = 0x10; cdb[4] = len; } else { page22 = long_trespass; if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS)) /* Set Honor Reservations bit */ page22[10] |= 0x80; len = sizeof(long_trespass); cdb[0] = MODE_SELECT_10; cdb[8] = len; } BUG_ON((len > CLARIION_BUFFER_SIZE)); memcpy(csdev->buffer, page22, len); err = scsi_execute(sdev, cdb, DMA_TO_DEVICE, csdev->buffer, len, NULL, &sshdr, CLARIION_TIMEOUT * HZ, CLARIION_RETRIES, req_flags, 0, NULL); if (err) { if (scsi_sense_valid(&sshdr)) res = trespass_endio(sdev, &sshdr); else { sdev_printk(KERN_INFO, sdev, "%s: failed to send MODE SELECT: %x\n", CLARIION_NAME, err); res = SCSI_DH_IO; } } return res; } static enum scsi_disposition 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 blk_status_t clariion_prep_fn(struct scsi_device *sdev, struct request *req) { struct clariion_dh_data *h = sdev->handler_data; if (h->lun_state != CLARIION_LUN_OWNED) { req->rq_flags |= RQF_QUIET; return BLK_STS_IOERR; } return BLK_STS_OK; } static int clariion_std_inquiry(struct scsi_device *sdev, struct clariion_dh_data *csdev) { int err = SCSI_DH_OK; char *sp_model; sp_model = parse_sp_model(sdev, sdev->inquiry); 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 = SCSI_DH_IO; if (!scsi_get_vpd_page(sdev, 0xC0, csdev->buffer, CLARIION_BUFFER_SIZE)) 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 = sdev->handler_data; 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 = sdev->handler_data; 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 int clariion_bus_attach(struct scsi_device *sdev) { struct clariion_dh_data *h; int err; h = kzalloc(sizeof(*h) , GFP_KERNEL); if (!h) return SCSI_DH_NOMEM; 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; 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'); sdev->handler_data = h; return SCSI_DH_OK; failed: kfree(h); return err; } static void clariion_bus_detach(struct scsi_device *sdev) { kfree(sdev->handler_data); sdev->handler_data = NULL; } static struct scsi_device_handler clariion_dh = { .name = CLARIION_NAME, .module = THIS_MODULE, .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, }; 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 <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>"); MODULE_LICENSE("GPL");
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