diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_scsi.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_scsi.c | 949 |
1 files changed, 949 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c new file mode 100644 index 000000000000..e21b547fd427 --- /dev/null +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -0,0 +1,949 @@ +/* + * + * linux/drivers/s390/scsi/zfcp_scsi.c + * + * FCP adapter driver for IBM eServer zSeries + * + * (C) Copyright IBM Corp. 2002, 2004 + * + * Author(s): Martin Peschke <mpeschke@de.ibm.com> + * Raimund Schroeder <raimund.schroeder@de.ibm.com> + * Aron Zeh + * Wolfgang Taphorn + * Stefan Bader <stefan.bader@de.ibm.com> + * Heiko Carstens <heiko.carstens@de.ibm.com> + * Andreas Herrmann <aherrman@de.ibm.com> + * + * 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 + +#define ZFCP_SCSI_REVISION "$Revision: 1.74 $" + +#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 zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int, + scsi_id_t); + +static struct device_attribute *zfcp_sysfs_sdev_attrs[]; + +struct scsi_transport_template *zfcp_transport_template; + +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, + }, + .driver_version = ZFCP_VERSION, + /* 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 where scsi command is issued + * @unit: unit to which scsi command is sent + * @scpnt: scsi command to be sent + * @timer: timer to be started if request is successfully initiated + * + * 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, struct timer_list *timer) +{ + 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, timer, + 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 + * @unit: unit where command is sent to + * @scpnt: scsi command to be sent + * @timer: timer to be started if request is successfully initiated + * Return: 0 + * + * Errors are indicated in scpnt->result + */ +int +zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, + struct timer_list *timer) +{ + int ret; + DECLARE_COMPLETION(wait); + + scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ + scpnt->scsi_done = zfcp_scsi_command_sync_handler; + ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer); + if (ret == 0) + wait_for_completion(&wait); + + scpnt->SCp.ptr = NULL; + + 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, NULL); +} + +/* + * 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; +} + +static struct zfcp_port * +zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id) +{ + struct zfcp_port *port; + + list_for_each_entry(port, &adapter->port_list_head, list) { + if (id == port->scsi_id) + return port; + } + return (struct zfcp_port *) NULL; +} + +/* + * 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); + + /* + * We block (call schedule) + * 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, 0); + 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, FCP_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, FCP_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, 0); + 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; + adapter->scsi_host->transportt = zfcp_transport_template; + /* + * 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); +} + +/* + * Support functions for FC transport class + */ +static void +zfcp_get_port_id(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; + struct zfcp_port *port; + unsigned long flags; + + read_lock_irqsave(&zfcp_data.config_lock, flags); + port = zfcp_port_lookup(adapter, starget->channel, starget->id); + if (port) + fc_starget_port_id(starget) = port->d_id; + else + fc_starget_port_id(starget) = -1; + read_unlock_irqrestore(&zfcp_data.config_lock, flags); +} + +static void +zfcp_get_port_name(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; + struct zfcp_port *port; + unsigned long flags; + + read_lock_irqsave(&zfcp_data.config_lock, flags); + port = zfcp_port_lookup(adapter, starget->channel, starget->id); + if (port) + fc_starget_port_name(starget) = port->wwpn; + else + fc_starget_port_name(starget) = -1; + read_unlock_irqrestore(&zfcp_data.config_lock, flags); +} + +static void +zfcp_get_node_name(struct scsi_target *starget) +{ + struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); + struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; + struct zfcp_port *port; + unsigned long flags; + + read_lock_irqsave(&zfcp_data.config_lock, flags); + port = zfcp_port_lookup(adapter, starget->channel, starget->id); + if (port) + fc_starget_node_name(starget) = port->wwnn; + else + fc_starget_node_name(starget) = -1; + read_unlock_irqrestore(&zfcp_data.config_lock, flags); +} + +struct fc_function_template zfcp_transport_functions = { + .get_starget_port_id = zfcp_get_port_id, + .get_starget_port_name = zfcp_get_port_name, + .get_starget_node_name = zfcp_get_node_name, + .show_starget_port_id = 1, + .show_starget_port_name = 1, + .show_starget_node_name = 1, +}; + +/** + * 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 |