/* * * linux/drivers/s390/scsi/zfcp_scsi.c * * FCP adapter driver for IBM eServer zSeries * * (C) Copyright IBM Corp. 2002, 2004 * * Author(s): Martin Peschke * Raimund Schroeder * Aron Zeh * Wolfgang Taphorn * Stefan Bader * Heiko Carstens * * 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; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI /* this drivers version (do not edit !!! generated and updated by cvs) */ #define ZFCP_SCSI_REVISION "$Revision: 1.62 $" #include "zfcp_ext.h" static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); static int zfcp_scsi_slave_configure(struct scsi_device *sdp); static int zfcp_scsi_queuecommand(struct scsi_cmnd *, void (*done) (struct scsi_cmnd *)); static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *); static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); static int zfcp_task_management_function(struct zfcp_unit *, u8); static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t, scsi_lun_t); static struct device_attribute *zfcp_sysfs_sdev_attrs[]; struct zfcp_data zfcp_data = { .scsi_host_template = { name: ZFCP_NAME, proc_name: "zfcp", proc_info: NULL, detect: NULL, slave_alloc: zfcp_scsi_slave_alloc, slave_configure: zfcp_scsi_slave_configure, slave_destroy: zfcp_scsi_slave_destroy, queuecommand: zfcp_scsi_queuecommand, eh_abort_handler: zfcp_scsi_eh_abort_handler, eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler, eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler, eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler, /* FIXME(openfcp): Tune */ can_queue: 4096, this_id: 0, /* * FIXME: * one less? can zfcp_create_sbale cope with it? */ sg_tablesize: ZFCP_MAX_SBALES_PER_REQ, cmd_per_lun: 1, unchecked_isa_dma: 0, use_clustering: 1, sdev_attrs: zfcp_sysfs_sdev_attrs, } /* rest initialised with zeros */ }; /* Find start of Response Information in FCP response unit*/ char * zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) { char *fcp_rsp_info_ptr; fcp_rsp_info_ptr = (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); return fcp_rsp_info_ptr; } /* Find start of Sense Information in FCP response unit*/ char * zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) { char *fcp_sns_info_ptr; fcp_sns_info_ptr = (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + fcp_rsp_iu->fcp_rsp_len; return fcp_sns_info_ptr; } fcp_dl_t * zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) { int additional_length = fcp_cmd->add_fcp_cdb_length << 2; fcp_dl_t *fcp_dl_addr; fcp_dl_addr = (fcp_dl_t *) ((unsigned char *) fcp_cmd + sizeof (struct fcp_cmnd_iu) + additional_length); /* * fcp_dl_addr = start address of fcp_cmnd structure + * size of fixed part + size of dynamically sized add_dcp_cdb field * SEE FCP-2 documentation */ return fcp_dl_addr; } fcp_dl_t zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) { return *zfcp_get_fcp_dl_ptr(fcp_cmd); } void zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) { *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; } /* * note: it's a bit-or operation not an assignment * regarding the specified byte */ static inline void set_byte(u32 * result, char status, char pos) { *result |= status << (pos * 8); } void set_host_byte(u32 * result, char status) { set_byte(result, status, 2); } void set_driver_byte(u32 * result, char status) { set_byte(result, status, 3); } /* * function: zfcp_scsi_slave_alloc * * purpose: * * returns: */ static int zfcp_scsi_slave_alloc(struct scsi_device *sdp) { struct zfcp_adapter *adapter; struct zfcp_unit *unit; unsigned long flags; int retval = -ENODEV; adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; if (!adapter) goto out; read_lock_irqsave(&zfcp_data.config_lock, flags); unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); if (unit) { sdp->hostdata = unit; unit->device = sdp; zfcp_unit_get(unit); retval = 0; } read_unlock_irqrestore(&zfcp_data.config_lock, flags); out: return retval; } /* * function: zfcp_scsi_slave_destroy * * purpose: * * returns: */ static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) { struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; if (unit) { sdpnt->hostdata = NULL; unit->device = NULL; zfcp_unit_put(unit); } else { ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " "address %p\n", sdpnt); } } /* * called from scsi midlayer to allow finetuning of a device. */ static int zfcp_scsi_slave_configure(struct scsi_device *sdp) { if (sdp->tagged_supported) scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); else scsi_adjust_queue_depth(sdp, 0, 1); return 0; } /** * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function * @scpnt: pointer to struct scsi_cmnd where result is set * @result: result to be set in scpnt (e.g. DID_ERROR) */ static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) { set_host_byte(&scpnt->result, result); zfcp_cmd_dbf_event_scsi("failing", scpnt); /* return directly */ scpnt->scsi_done(scpnt); } /** * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and * zfcp_scsi_command_sync * @adapter: adapter for where scsi command is issued * @unit: unit to which scsi command is sent * @scpnt: scsi command to be sent * * Note: In scsi_done function must be set in scpnt. */ int zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, struct scsi_cmnd *scpnt) { int tmp; int retval; retval = 0; BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); BUG_ON(scpnt->scsi_done == NULL); if (unlikely(NULL == unit)) { zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); goto out; } if (unlikely( atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " "0x%016Lx on adapter %s\n", unit->fcp_lun, unit->port->wwpn, zfcp_get_busid_by_adapter(adapter)); zfcp_scsi_command_fail(scpnt, DID_ERROR); goto out; } if (unlikely( !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " "on port 0x%016Lx in recovery\n", zfcp_get_busid_by_unit(unit), unit->fcp_lun, unit->port->wwpn); retval = SCSI_MLQUEUE_DEVICE_BUSY; goto out; } tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, ZFCP_REQ_AUTO_CLEANUP); if (unlikely(tmp < 0)) { ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); retval = SCSI_MLQUEUE_HOST_BUSY; } out: return retval; } void zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) { struct completion *wait = (struct completion *) scpnt->SCp.ptr; complete(wait); } /** * zfcp_scsi_command_sync - send a SCSI command and wait for completion * returns 0, errors are indicated by scsi_cmnd->result */ int zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt) { DECLARE_COMPLETION(wait); scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ scpnt->done = zfcp_scsi_command_sync_handler; zfcp_scsi_command_async(unit->port->adapter, unit, scpnt); wait_for_completion(&wait); return 0; } /* * function: zfcp_scsi_queuecommand * * purpose: enqueues a SCSI command to the specified target device * * returns: 0 - success, SCSI command enqueued * !0 - failure */ int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, void (*done) (struct scsi_cmnd *)) { struct zfcp_unit *unit; struct zfcp_adapter *adapter; /* reset the status for this request */ scpnt->result = 0; scpnt->host_scribble = NULL; scpnt->scsi_done = done; /* * figure out adapter and target device * (stored there by zfcp_scsi_slave_alloc) */ adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; unit = (struct zfcp_unit *) scpnt->device->hostdata; return zfcp_scsi_command_async(adapter, unit, scpnt); } /* * function: zfcp_unit_lookup * * purpose: * * returns: * * context: */ static struct zfcp_unit * zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id, scsi_lun_t lun) { struct zfcp_port *port; struct zfcp_unit *unit, *retval = NULL; list_for_each_entry(port, &adapter->port_list_head, list) { if (id != port->scsi_id) continue; list_for_each_entry(unit, &port->unit_list_head, list) { if (lun == unit->scsi_lun) { retval = unit; goto out; } } } out: return retval; } /* * function: zfcp_scsi_eh_abort_handler * * purpose: tries to abort the specified (timed out) SCSI command * * note: We do not need to care for a SCSI command which completes * normally but late during this abort routine runs. * We are allowed to return late commands to the SCSI stack. * It tracks the state of commands and will handle late commands. * (Usually, the normal completion of late commands is ignored with * respect to the running abort operation. Grep for 'done_late' * in the SCSI stacks sources.) * * returns: SUCCESS - command has been aborted and cleaned up in internal * bookkeeping, * SCSI stack won't be called for aborted command * FAILED - otherwise */ int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) { int retval = SUCCESS; struct zfcp_fsf_req *new_fsf_req, *old_fsf_req; struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; struct zfcp_port *port = unit->port; struct Scsi_Host *scsi_host = scpnt->device->host; union zfcp_req_data *req_data = NULL; unsigned long flags; u32 status = 0; /* the components of a abort_dbf record (fixed size record) */ u64 dbf_scsi_cmnd = (unsigned long) scpnt; char dbf_opcode[ZFCP_ABORT_DBF_LENGTH]; wwn_t dbf_wwn = port->wwpn; fcp_lun_t dbf_fcp_lun = unit->fcp_lun; u64 dbf_retries = scpnt->retries; u64 dbf_allowed = scpnt->allowed; u64 dbf_timeout = 0; u64 dbf_fsf_req = 0; u64 dbf_fsf_status = 0; u64 dbf_fsf_qual[2] = { 0, 0 }; char dbf_result[ZFCP_ABORT_DBF_LENGTH] = { "##undef" }; memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH); memcpy(dbf_opcode, scpnt->cmnd, min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH)); ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", scpnt, zfcp_get_busid_by_adapter(adapter)); spin_unlock_irq(scsi_host->host_lock); /* * Race condition between normal (late) completion and abort has * to be avoided. * The entirity of all accesses to scsi_req have to be atomic. * scsi_req is usually part of the fsf_req and thus we block the * release of fsf_req as long as we need to access scsi_req. */ write_lock_irqsave(&adapter->abort_lock, flags); /* * Check whether command has just completed and can not be aborted. * Even if the command has just been completed late, we can access * scpnt since the SCSI stack does not release it at least until * this routine returns. (scpnt is parameter passed to this routine * and must not disappear during abort even on late completion.) */ req_data = (union zfcp_req_data *) scpnt->host_scribble; /* DEBUG */ ZFCP_LOG_DEBUG("req_data=%p\n", req_data); if (!req_data) { ZFCP_LOG_DEBUG("late command completion overtook abort\n"); /* * That's it. * Do not initiate abort but return SUCCESS. */ write_unlock_irqrestore(&adapter->abort_lock, flags); retval = SUCCESS; strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH); goto out; } /* Figure out which fsf_req needs to be aborted. */ old_fsf_req = req_data->send_fcp_command_task.fsf_req; dbf_fsf_req = (unsigned long) old_fsf_req; dbf_timeout = (jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ; ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req); if (!old_fsf_req) { write_unlock_irqrestore(&adapter->abort_lock, flags); ZFCP_LOG_NORMAL("bug: no old fsf request found\n"); ZFCP_LOG_NORMAL("req_data:\n"); ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, (char *) req_data, sizeof (union zfcp_req_data)); ZFCP_LOG_NORMAL("scsi_cmnd:\n"); ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, (char *) scpnt, sizeof (struct scsi_cmnd)); retval = FAILED; strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH); goto out; } old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL; /* mark old request as being aborted */ old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; /* * We have to collect all information (e.g. unit) needed by * zfcp_fsf_abort_fcp_command before calling that routine * since that routine is not allowed to access * fsf_req which it is going to abort. * This is because of we need to release fsf_req_list_lock * before calling zfcp_fsf_abort_fcp_command. * Since this lock will not be held, fsf_req may complete * late and may be released meanwhile. */ ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit); /* * The 'Abort FCP Command' routine may block (call schedule) * because it may wait for a free SBAL. * That's why we must release the lock and enable the * interrupts before. * On the other hand we do not need the lock anymore since * all critical accesses to scsi_req are done. */ write_unlock_irqrestore(&adapter->abort_lock, flags); /* call FSF routine which does the abort */ new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req, adapter, unit, ZFCP_WAIT_FOR_SBAL); ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req); if (!new_fsf_req) { retval = FAILED; ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd " "failed\n"); strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH); goto out; } /* wait for completion of abort */ ZFCP_LOG_DEBUG("waiting for cleanup...\n"); #if 1 /* * FIXME: * copying zfcp_fsf_req_wait_and_cleanup code is not really nice */ __wait_event(new_fsf_req->completion_wq, new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); status = new_fsf_req->status; dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status; /* * Ralphs special debug load provides timestamps in the FSF * status qualifier. This might be specified later if being * useful for debugging aborts. */ dbf_fsf_qual[0] = *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0]; dbf_fsf_qual[1] = *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2]; zfcp_fsf_req_cleanup(new_fsf_req); #else retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req, ZFCP_UNINTERRUPTIBLE, &status); #endif ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status); /* status should be valid since signals were not permitted */ if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { retval = SUCCESS; strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH); } else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { retval = SUCCESS; strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH); } else { retval = FAILED; strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH); } out: debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH); debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t)); debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t)); debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64)); debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64)); debug_text_event(adapter->abort_dbf, 1, dbf_result); spin_lock_irq(scsi_host->host_lock); return retval; } /* * function: zfcp_scsi_eh_device_reset_handler * * purpose: * * returns: */ int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) { int retval; struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; struct Scsi_Host *scsi_host = scpnt->device->host; spin_unlock_irq(scsi_host->host_lock); if (!unit) { ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); retval = SUCCESS; goto out; } ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); /* * If we do not know whether the unit supports 'logical unit reset' * then try 'logical unit reset' and proceed with 'target reset' * if 'logical unit reset' fails. * If the unit is known not to support 'logical unit reset' then * skip 'logical unit reset' and try 'target reset' immediately. */ if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, &unit->status)) { retval = zfcp_task_management_function(unit, LOGICAL_UNIT_RESET); if (retval) { ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); if (retval == -ENOTSUPP) atomic_set_mask (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, &unit->status); /* fall through and try 'target reset' next */ } else { ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", unit); /* avoid 'target reset' */ retval = SUCCESS; goto out; } } retval = zfcp_task_management_function(unit, TARGET_RESET); if (retval) { ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); retval = FAILED; } else { ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); retval = SUCCESS; } out: spin_lock_irq(scsi_host->host_lock); return retval; } static int zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags) { struct zfcp_adapter *adapter = unit->port->adapter; int retval; int status; struct zfcp_fsf_req *fsf_req; /* issue task management function */ fsf_req = zfcp_fsf_send_fcp_command_task_management (adapter, unit, tm_flags, ZFCP_WAIT_FOR_SBAL); if (!fsf_req) { ZFCP_LOG_INFO("error: creation of task management request " "failed for unit 0x%016Lx on port 0x%016Lx on " "adapter %s\n", unit->fcp_lun, unit->port->wwpn, zfcp_get_busid_by_adapter(adapter)); retval = -ENOMEM; goto out; } retval = zfcp_fsf_req_wait_and_cleanup(fsf_req, ZFCP_UNINTERRUPTIBLE, &status); /* * check completion status of task management function * (status should always be valid since no signals permitted) */ if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) retval = -EIO; else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) retval = -ENOTSUPP; else retval = 0; out: return retval; } /* * function: zfcp_scsi_eh_bus_reset_handler * * purpose: * * returns: */ int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) { int retval = 0; struct zfcp_unit *unit; struct Scsi_Host *scsi_host = scpnt->device->host; spin_unlock_irq(scsi_host->host_lock); unit = (struct zfcp_unit *) scpnt->device->hostdata; ZFCP_LOG_NORMAL("bus reset because of problems with " "unit 0x%016Lx\n", unit->fcp_lun); zfcp_erp_adapter_reopen(unit->port->adapter, 0); zfcp_erp_wait(unit->port->adapter); retval = SUCCESS; spin_lock_irq(scsi_host->host_lock); return retval; } /* * function: zfcp_scsi_eh_host_reset_handler * * purpose: * * returns: */ int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) { int retval = 0; struct zfcp_unit *unit; struct Scsi_Host *scsi_host = scpnt->device->host; spin_unlock_irq(scsi_host->host_lock); unit = (struct zfcp_unit *) scpnt->device->hostdata; ZFCP_LOG_NORMAL("host reset because of problems with " "unit 0x%016Lx\n", unit->fcp_lun); zfcp_erp_adapter_reopen(unit->port->adapter, 0); zfcp_erp_wait(unit->port->adapter); retval = SUCCESS; spin_lock_irq(scsi_host->host_lock); return retval; } /* * function: * * purpose: * * returns: */ int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) { int retval = 0; static unsigned int unique_id = 0; /* register adapter as SCSI host with mid layer of SCSI stack */ adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, sizeof (struct zfcp_adapter *)); if (!adapter->scsi_host) { ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " "for adapter %s ", zfcp_get_busid_by_adapter(adapter)); retval = -EIO; goto out; } ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); /* tell the SCSI stack some characteristics of this adapter */ adapter->scsi_host->max_id = 1; adapter->scsi_host->max_lun = 1; adapter->scsi_host->max_channel = 0; adapter->scsi_host->unique_id = unique_id++; /* FIXME */ adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; /* * Reverse mapping of the host number to avoid race condition */ adapter->scsi_host_no = adapter->scsi_host->host_no; /* * save a pointer to our own adapter data structure within * hostdata field of SCSI host data structure */ adapter->scsi_host->hostdata[0] = (unsigned long) adapter; if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { scsi_host_put(adapter->scsi_host); retval = -EIO; goto out; } atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); out: return retval; } /* * function: * * purpose: * * returns: */ void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) { struct Scsi_Host *shost; shost = adapter->scsi_host; if (!shost) return; scsi_remove_host(shost); scsi_host_put(shost); adapter->scsi_host = NULL; adapter->scsi_host_no = 0; atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); return; } void zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) { adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; adapter->scsi_er_timer.data = (unsigned long) adapter; adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; add_timer(&adapter->scsi_er_timer); } /** * ZFCP_DEFINE_SCSI_ATTR * @_name: name of show attribute * @_format: format string * @_value: value to print * * Generates attribute for a unit. */ #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, \ char *buf) \ { \ struct scsi_device *sdev; \ struct zfcp_unit *unit; \ \ sdev = to_scsi_device(dev); \ unit = sdev->hostdata; \ return sprintf(buf, _format, _value); \ } \ \ static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { &dev_attr_fcp_lun, &dev_attr_wwpn, &dev_attr_hba_id, NULL }; #undef ZFCP_LOG_AREA