| /* |
| * zfcp device driver |
| * |
| * Interface to Linux SCSI midlayer. |
| * |
| * Copyright IBM Corporation 2002, 2008 |
| */ |
| |
| #define KMSG_COMPONENT "zfcp" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include "zfcp_ext.h" |
| #include <asm/atomic.h> |
| |
| /* 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[1]; |
| if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) |
| fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len; |
| |
| return fcp_sns_info_ptr; |
| } |
| |
| static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) |
| { |
| struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; |
| unit->device = NULL; |
| zfcp_erp_unit_failed(unit, "scslvd1", NULL); |
| zfcp_unit_put(unit); |
| } |
| |
| static int zfcp_scsi_slave_configure(struct scsi_device *sdp) |
| { |
| if (sdp->tagged_supported) |
| scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32); |
| else |
| scsi_adjust_queue_depth(sdp, 0, 1); |
| return 0; |
| } |
| |
| static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) |
| { |
| set_host_byte(scpnt, result); |
| if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) |
| zfcp_scsi_dbf_event_result("fail", 4, |
| (struct zfcp_adapter*) scpnt->device->host->hostdata[0], |
| scpnt, NULL); |
| /* return directly */ |
| scpnt->scsi_done(scpnt); |
| } |
| |
| static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, |
| void (*done) (struct scsi_cmnd *)) |
| { |
| struct zfcp_unit *unit; |
| struct zfcp_adapter *adapter; |
| int status; |
| int ret; |
| |
| /* 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 = scpnt->device->hostdata; |
| |
| BUG_ON(!adapter || (adapter != unit->port->adapter)); |
| BUG_ON(!scpnt->scsi_done); |
| |
| if (unlikely(!unit)) { |
| zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); |
| return 0; |
| } |
| |
| status = atomic_read(&unit->status); |
| if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) || |
| !(status & ZFCP_STATUS_COMMON_RUNNING))) { |
| zfcp_scsi_command_fail(scpnt, DID_ERROR); |
| return 0;; |
| } |
| |
| ret = zfcp_fsf_send_fcp_command_task(unit, scpnt); |
| if (unlikely(ret == -EBUSY)) |
| return SCSI_MLQUEUE_DEVICE_BUSY; |
| else if (unlikely(ret < 0)) |
| return SCSI_MLQUEUE_HOST_BUSY; |
| |
| return ret; |
| } |
| |
| static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter, |
| int channel, unsigned int id, |
| unsigned int lun) |
| { |
| struct zfcp_port *port; |
| struct zfcp_unit *unit; |
| int scsi_lun; |
| |
| list_for_each_entry(port, &adapter->port_list_head, list) { |
| if (!port->rport || (id != port->rport->scsi_target_id)) |
| continue; |
| list_for_each_entry(unit, &port->unit_list_head, list) { |
| scsi_lun = scsilun_to_int( |
| (struct scsi_lun *)&unit->fcp_lun); |
| if (lun == scsi_lun) |
| return unit; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static int zfcp_scsi_slave_alloc(struct scsi_device *sdp) |
| { |
| struct zfcp_adapter *adapter; |
| struct zfcp_unit *unit; |
| unsigned long flags; |
| int retval = -ENXIO; |
| |
| 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; |
| } |
| |
| static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) |
| { |
| struct Scsi_Host *scsi_host = scpnt->device->host; |
| struct zfcp_adapter *adapter = |
| (struct zfcp_adapter *) scsi_host->hostdata[0]; |
| struct zfcp_unit *unit = scpnt->device->hostdata; |
| struct zfcp_fsf_req *old_req, *abrt_req; |
| unsigned long flags; |
| unsigned long old_req_id = (unsigned long) scpnt->host_scribble; |
| int retval = SUCCESS; |
| int retry = 3; |
| |
| /* avoid race condition between late normal completion and abort */ |
| write_lock_irqsave(&adapter->abort_lock, flags); |
| |
| spin_lock(&adapter->req_list_lock); |
| old_req = zfcp_reqlist_find(adapter, old_req_id); |
| spin_unlock(&adapter->req_list_lock); |
| if (!old_req) { |
| write_unlock_irqrestore(&adapter->abort_lock, flags); |
| zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, |
| old_req_id); |
| return SUCCESS; |
| } |
| old_req->data = NULL; |
| |
| /* don't access old fsf_req after releasing the abort_lock */ |
| write_unlock_irqrestore(&adapter->abort_lock, flags); |
| |
| while (retry--) { |
| abrt_req = zfcp_fsf_abort_fcp_command(old_req_id, unit); |
| if (abrt_req) |
| break; |
| |
| zfcp_erp_wait(adapter); |
| if (!(atomic_read(&adapter->status) & |
| ZFCP_STATUS_COMMON_RUNNING)) { |
| zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, |
| old_req_id); |
| return SUCCESS; |
| } |
| } |
| if (!abrt_req) |
| return FAILED; |
| |
| wait_event(abrt_req->completion_wq, |
| abrt_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); |
| |
| if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) |
| zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, abrt_req, 0); |
| else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) |
| zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, abrt_req, 0); |
| else { |
| zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, abrt_req, 0); |
| retval = FAILED; |
| } |
| zfcp_fsf_req_free(abrt_req); |
| return retval; |
| } |
| |
| static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags) |
| { |
| struct zfcp_unit *unit = scpnt->device->hostdata; |
| struct zfcp_adapter *adapter = unit->port->adapter; |
| struct zfcp_fsf_req *fsf_req; |
| int retval = SUCCESS; |
| int retry = 3; |
| |
| while (retry--) { |
| fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags); |
| if (fsf_req) |
| break; |
| |
| zfcp_erp_wait(adapter); |
| if (!(atomic_read(&adapter->status) & |
| ZFCP_STATUS_COMMON_RUNNING)) { |
| zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, |
| scpnt); |
| return SUCCESS; |
| } |
| } |
| if (!fsf_req) |
| return FAILED; |
| |
| wait_event(fsf_req->completion_wq, |
| fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); |
| |
| if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { |
| zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); |
| retval = FAILED; |
| } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { |
| zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); |
| retval = FAILED; |
| } else |
| zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); |
| |
| zfcp_fsf_req_free(fsf_req); |
| return retval; |
| } |
| |
| static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) |
| { |
| return zfcp_task_mgmt_function(scpnt, FCP_LOGICAL_UNIT_RESET); |
| } |
| |
| static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) |
| { |
| return zfcp_task_mgmt_function(scpnt, FCP_TARGET_RESET); |
| } |
| |
| static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) |
| { |
| struct zfcp_unit *unit = scpnt->device->hostdata; |
| struct zfcp_adapter *adapter = unit->port->adapter; |
| |
| zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt); |
| zfcp_erp_wait(adapter); |
| |
| return SUCCESS; |
| } |
| |
| int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) |
| { |
| struct ccw_dev_id dev_id; |
| |
| if (adapter->scsi_host) |
| return 0; |
| |
| ccw_device_get_id(adapter->ccw_device, &dev_id); |
| /* 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) { |
| dev_err(&adapter->ccw_device->dev, |
| "Registering the FCP device with the " |
| "SCSI stack failed\n"); |
| return -EIO; |
| } |
| |
| /* 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 = dev_id.devno; |
| adapter->scsi_host->max_cmd_len = 255; |
| adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; |
| |
| 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); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) |
| { |
| struct Scsi_Host *shost; |
| struct zfcp_port *port; |
| |
| shost = adapter->scsi_host; |
| if (!shost) |
| return; |
| |
| read_lock_irq(&zfcp_data.config_lock); |
| list_for_each_entry(port, &adapter->port_list_head, list) |
| if (port->rport) |
| port->rport = NULL; |
| |
| read_unlock_irq(&zfcp_data.config_lock); |
| fc_remove_host(shost); |
| scsi_remove_host(shost); |
| scsi_host_put(shost); |
| adapter->scsi_host = NULL; |
| |
| return; |
| } |
| |
| static struct fc_host_statistics* |
| zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) |
| { |
| struct fc_host_statistics *fc_stats; |
| |
| if (!adapter->fc_stats) { |
| fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); |
| if (!fc_stats) |
| return NULL; |
| adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ |
| } |
| memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); |
| return adapter->fc_stats; |
| } |
| |
| static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, |
| struct fsf_qtcb_bottom_port *data, |
| struct fsf_qtcb_bottom_port *old) |
| { |
| fc_stats->seconds_since_last_reset = |
| data->seconds_since_last_reset - old->seconds_since_last_reset; |
| fc_stats->tx_frames = data->tx_frames - old->tx_frames; |
| fc_stats->tx_words = data->tx_words - old->tx_words; |
| fc_stats->rx_frames = data->rx_frames - old->rx_frames; |
| fc_stats->rx_words = data->rx_words - old->rx_words; |
| fc_stats->lip_count = data->lip - old->lip; |
| fc_stats->nos_count = data->nos - old->nos; |
| fc_stats->error_frames = data->error_frames - old->error_frames; |
| fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; |
| fc_stats->link_failure_count = data->link_failure - old->link_failure; |
| fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; |
| fc_stats->loss_of_signal_count = |
| data->loss_of_signal - old->loss_of_signal; |
| fc_stats->prim_seq_protocol_err_count = |
| data->psp_error_counts - old->psp_error_counts; |
| fc_stats->invalid_tx_word_count = |
| data->invalid_tx_words - old->invalid_tx_words; |
| fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; |
| fc_stats->fcp_input_requests = |
| data->input_requests - old->input_requests; |
| fc_stats->fcp_output_requests = |
| data->output_requests - old->output_requests; |
| fc_stats->fcp_control_requests = |
| data->control_requests - old->control_requests; |
| fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; |
| fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; |
| } |
| |
| static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, |
| struct fsf_qtcb_bottom_port *data) |
| { |
| fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; |
| fc_stats->tx_frames = data->tx_frames; |
| fc_stats->tx_words = data->tx_words; |
| fc_stats->rx_frames = data->rx_frames; |
| fc_stats->rx_words = data->rx_words; |
| fc_stats->lip_count = data->lip; |
| fc_stats->nos_count = data->nos; |
| fc_stats->error_frames = data->error_frames; |
| fc_stats->dumped_frames = data->dumped_frames; |
| fc_stats->link_failure_count = data->link_failure; |
| fc_stats->loss_of_sync_count = data->loss_of_sync; |
| fc_stats->loss_of_signal_count = data->loss_of_signal; |
| fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; |
| fc_stats->invalid_tx_word_count = data->invalid_tx_words; |
| fc_stats->invalid_crc_count = data->invalid_crcs; |
| fc_stats->fcp_input_requests = data->input_requests; |
| fc_stats->fcp_output_requests = data->output_requests; |
| fc_stats->fcp_control_requests = data->control_requests; |
| fc_stats->fcp_input_megabytes = data->input_mb; |
| fc_stats->fcp_output_megabytes = data->output_mb; |
| } |
| |
| static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) |
| { |
| struct zfcp_adapter *adapter; |
| struct fc_host_statistics *fc_stats; |
| struct fsf_qtcb_bottom_port *data; |
| int ret; |
| |
| adapter = (struct zfcp_adapter *)host->hostdata[0]; |
| fc_stats = zfcp_init_fc_host_stats(adapter); |
| if (!fc_stats) |
| return NULL; |
| |
| data = kzalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return NULL; |
| |
| ret = zfcp_fsf_exchange_port_data_sync(adapter, data); |
| if (ret) { |
| kfree(data); |
| return NULL; |
| } |
| |
| if (adapter->stats_reset && |
| ((jiffies/HZ - adapter->stats_reset) < |
| data->seconds_since_last_reset)) |
| zfcp_adjust_fc_host_stats(fc_stats, data, |
| adapter->stats_reset_data); |
| else |
| zfcp_set_fc_host_stats(fc_stats, data); |
| |
| kfree(data); |
| return fc_stats; |
| } |
| |
| static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) |
| { |
| struct zfcp_adapter *adapter; |
| struct fsf_qtcb_bottom_port *data; |
| int ret; |
| |
| adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| data = kzalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return; |
| |
| ret = zfcp_fsf_exchange_port_data_sync(adapter, data); |
| if (ret) |
| kfree(data); |
| else { |
| adapter->stats_reset = jiffies/HZ; |
| kfree(adapter->stats_reset_data); |
| adapter->stats_reset_data = data; /* finally freed in |
| adapter_dequeue */ |
| } |
| } |
| |
| static void zfcp_get_host_port_state(struct Scsi_Host *shost) |
| { |
| struct zfcp_adapter *adapter = |
| (struct zfcp_adapter *)shost->hostdata[0]; |
| int status = atomic_read(&adapter->status); |
| |
| if ((status & ZFCP_STATUS_COMMON_RUNNING) && |
| !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) |
| fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; |
| else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) |
| fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; |
| else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) |
| fc_host_port_state(shost) = FC_PORTSTATE_ERROR; |
| else |
| fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; |
| } |
| |
| static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) |
| { |
| rport->dev_loss_tmo = timeout; |
| } |
| |
| struct fc_function_template zfcp_transport_functions = { |
| .show_starget_port_id = 1, |
| .show_starget_port_name = 1, |
| .show_starget_node_name = 1, |
| .show_rport_supported_classes = 1, |
| .show_rport_maxframe_size = 1, |
| .show_rport_dev_loss_tmo = 1, |
| .show_host_node_name = 1, |
| .show_host_port_name = 1, |
| .show_host_permanent_port_name = 1, |
| .show_host_supported_classes = 1, |
| .show_host_supported_speeds = 1, |
| .show_host_maxframe_size = 1, |
| .show_host_serial_number = 1, |
| .get_fc_host_stats = zfcp_get_fc_host_stats, |
| .reset_fc_host_stats = zfcp_reset_fc_host_stats, |
| .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, |
| .get_host_port_state = zfcp_get_host_port_state, |
| .show_host_port_state = 1, |
| /* no functions registered for following dynamic attributes but |
| directly set by LLDD */ |
| .show_host_port_type = 1, |
| .show_host_speed = 1, |
| .show_host_port_id = 1, |
| .disable_target_scan = 1, |
| }; |
| |
| struct zfcp_data zfcp_data = { |
| .scsi_host_template = { |
| .name = "zfcp", |
| .module = THIS_MODULE, |
| .proc_name = "zfcp", |
| .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_target_reset_handler = zfcp_scsi_eh_target_reset_handler, |
| .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, |
| .can_queue = 4096, |
| .this_id = -1, |
| .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, |
| .cmd_per_lun = 1, |
| .use_clustering = 1, |
| .sdev_attrs = zfcp_sysfs_sdev_attrs, |
| .max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8), |
| .shost_attrs = zfcp_sysfs_shost_attrs, |
| }, |
| }; |