4 * Interface to Linux SCSI midlayer.
6 * Copyright IBM Corporation 2002, 2009
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/types.h>
13 #include <scsi/fc/fc_fcp.h>
14 #include <asm/atomic.h>
19 static unsigned int default_depth = 32;
20 module_param_named(queue_depth, default_depth, uint, 0600);
21 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
23 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
27 case SCSI_QDEPTH_DEFAULT:
28 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
30 case SCSI_QDEPTH_QFULL:
31 scsi_track_queue_full(sdev, depth);
33 case SCSI_QDEPTH_RAMP_UP:
34 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
39 return sdev->queue_depth;
42 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
44 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
46 put_device(&unit->sysfs_device);
49 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
51 if (sdp->tagged_supported)
52 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
54 scsi_adjust_queue_depth(sdp, 0, 1);
58 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
60 struct zfcp_adapter *adapter =
61 (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
62 set_host_byte(scpnt, result);
63 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
64 zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL);
66 scpnt->scsi_done(scpnt);
69 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
70 void (*done) (struct scsi_cmnd *))
72 struct zfcp_unit *unit;
73 struct zfcp_adapter *adapter;
74 int status, scsi_result, ret;
75 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
77 /* reset the status for this request */
79 scpnt->host_scribble = NULL;
80 scpnt->scsi_done = done;
83 * figure out adapter and target device
84 * (stored there by zfcp_scsi_slave_alloc)
86 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
87 unit = scpnt->device->hostdata;
89 BUG_ON(!adapter || (adapter != unit->port->adapter));
90 BUG_ON(!scpnt->scsi_done);
92 if (unlikely(!unit)) {
93 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
97 scsi_result = fc_remote_port_chkready(rport);
98 if (unlikely(scsi_result)) {
99 scpnt->result = scsi_result;
100 zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL);
101 scpnt->scsi_done(scpnt);
105 status = atomic_read(&unit->status);
106 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
107 !(atomic_read(&unit->port->status) &
108 ZFCP_STATUS_COMMON_ERP_FAILED)) {
109 /* only unit access denied, but port is good
110 * not covered by FC transport, have to fail here */
111 zfcp_scsi_command_fail(scpnt, DID_ERROR);
115 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
116 /* This could be either
117 * open unit pending: this is temporary, will result in
118 * open unit or ERP_FAILED, so retry command
119 * call to rport_delete pending: mimic retry from
120 * fc_remote_port_chkready until rport is BLOCKED
122 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
126 ret = zfcp_fsf_send_fcp_command_task(unit, scpnt);
127 if (unlikely(ret == -EBUSY))
128 return SCSI_MLQUEUE_DEVICE_BUSY;
129 else if (unlikely(ret < 0))
130 return SCSI_MLQUEUE_HOST_BUSY;
135 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
136 unsigned int id, u64 lun)
139 struct zfcp_port *port;
140 struct zfcp_unit *unit = NULL;
142 read_lock_irqsave(&adapter->port_list_lock, flags);
143 list_for_each_entry(port, &adapter->port_list, list) {
144 if (!port->rport || (id != port->rport->scsi_target_id))
146 unit = zfcp_get_unit_by_lun(port, lun);
150 read_unlock_irqrestore(&adapter->port_list_lock, flags);
155 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
157 struct zfcp_adapter *adapter;
158 struct zfcp_unit *unit;
161 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
165 int_to_scsilun(sdp->lun, (struct scsi_lun *)&lun);
166 unit = zfcp_unit_lookup(adapter, sdp->id, lun);
168 sdp->hostdata = unit;
176 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
178 struct Scsi_Host *scsi_host = scpnt->device->host;
179 struct zfcp_adapter *adapter =
180 (struct zfcp_adapter *) scsi_host->hostdata[0];
181 struct zfcp_unit *unit = scpnt->device->hostdata;
182 struct zfcp_fsf_req *old_req, *abrt_req;
184 unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
185 int retval = SUCCESS;
189 /* avoid race condition between late normal completion and abort */
190 write_lock_irqsave(&adapter->abort_lock, flags);
192 spin_lock(&adapter->req_list_lock);
193 old_req = zfcp_reqlist_find(adapter, old_reqid);
194 spin_unlock(&adapter->req_list_lock);
196 write_unlock_irqrestore(&adapter->abort_lock, flags);
197 zfcp_dbf_scsi_abort("lte1", adapter->dbf, scpnt, NULL,
199 return FAILED; /* completion could be in progress */
201 old_req->data = NULL;
203 /* don't access old fsf_req after releasing the abort_lock */
204 write_unlock_irqrestore(&adapter->abort_lock, flags);
207 abrt_req = zfcp_fsf_abort_fcp_command(old_reqid, unit);
211 zfcp_erp_wait(adapter);
212 fc_block_scsi_eh(scpnt);
213 if (!(atomic_read(&adapter->status) &
214 ZFCP_STATUS_COMMON_RUNNING)) {
215 zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL,
223 wait_for_completion(&abrt_req->completion);
225 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
227 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
233 zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid);
234 zfcp_fsf_req_free(abrt_req);
238 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
240 struct zfcp_unit *unit = scpnt->device->hostdata;
241 struct zfcp_adapter *adapter = unit->port->adapter;
242 struct zfcp_fsf_req *fsf_req = NULL;
243 int retval = SUCCESS;
247 fsf_req = zfcp_fsf_send_fcp_ctm(unit, tm_flags);
251 zfcp_erp_wait(adapter);
252 fc_block_scsi_eh(scpnt);
253 if (!(atomic_read(&adapter->status) &
254 ZFCP_STATUS_COMMON_RUNNING)) {
255 zfcp_dbf_scsi_devreset("nres", tm_flags, unit, scpnt);
262 wait_for_completion(&fsf_req->completion);
264 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
265 zfcp_dbf_scsi_devreset("fail", tm_flags, unit, scpnt);
268 zfcp_dbf_scsi_devreset("okay", tm_flags, unit, scpnt);
270 zfcp_fsf_req_free(fsf_req);
274 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
276 return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
279 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
281 return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
284 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
286 struct zfcp_unit *unit = scpnt->device->hostdata;
287 struct zfcp_adapter *adapter = unit->port->adapter;
289 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1", scpnt);
290 zfcp_erp_wait(adapter);
291 fc_block_scsi_eh(scpnt);
296 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
298 struct ccw_dev_id dev_id;
300 if (adapter->scsi_host)
303 ccw_device_get_id(adapter->ccw_device, &dev_id);
304 /* register adapter as SCSI host with mid layer of SCSI stack */
305 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
306 sizeof (struct zfcp_adapter *));
307 if (!adapter->scsi_host) {
308 dev_err(&adapter->ccw_device->dev,
309 "Registering the FCP device with the "
310 "SCSI stack failed\n");
314 /* tell the SCSI stack some characteristics of this adapter */
315 adapter->scsi_host->max_id = 1;
316 adapter->scsi_host->max_lun = 1;
317 adapter->scsi_host->max_channel = 0;
318 adapter->scsi_host->unique_id = dev_id.devno;
319 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
320 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
322 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
324 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
325 scsi_host_put(adapter->scsi_host);
332 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
334 struct Scsi_Host *shost;
335 struct zfcp_port *port;
337 shost = adapter->scsi_host;
341 read_lock_irq(&adapter->port_list_lock);
342 list_for_each_entry(port, &adapter->port_list, list)
344 read_unlock_irq(&adapter->port_list_lock);
346 fc_remove_host(shost);
347 scsi_remove_host(shost);
348 scsi_host_put(shost);
349 adapter->scsi_host = NULL;
354 static struct fc_host_statistics*
355 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
357 struct fc_host_statistics *fc_stats;
359 if (!adapter->fc_stats) {
360 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
363 adapter->fc_stats = fc_stats; /* freed in adapter_release */
365 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
366 return adapter->fc_stats;
369 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
370 struct fsf_qtcb_bottom_port *data,
371 struct fsf_qtcb_bottom_port *old)
373 fc_stats->seconds_since_last_reset =
374 data->seconds_since_last_reset - old->seconds_since_last_reset;
375 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
376 fc_stats->tx_words = data->tx_words - old->tx_words;
377 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
378 fc_stats->rx_words = data->rx_words - old->rx_words;
379 fc_stats->lip_count = data->lip - old->lip;
380 fc_stats->nos_count = data->nos - old->nos;
381 fc_stats->error_frames = data->error_frames - old->error_frames;
382 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
383 fc_stats->link_failure_count = data->link_failure - old->link_failure;
384 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
385 fc_stats->loss_of_signal_count =
386 data->loss_of_signal - old->loss_of_signal;
387 fc_stats->prim_seq_protocol_err_count =
388 data->psp_error_counts - old->psp_error_counts;
389 fc_stats->invalid_tx_word_count =
390 data->invalid_tx_words - old->invalid_tx_words;
391 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
392 fc_stats->fcp_input_requests =
393 data->input_requests - old->input_requests;
394 fc_stats->fcp_output_requests =
395 data->output_requests - old->output_requests;
396 fc_stats->fcp_control_requests =
397 data->control_requests - old->control_requests;
398 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
399 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
402 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
403 struct fsf_qtcb_bottom_port *data)
405 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
406 fc_stats->tx_frames = data->tx_frames;
407 fc_stats->tx_words = data->tx_words;
408 fc_stats->rx_frames = data->rx_frames;
409 fc_stats->rx_words = data->rx_words;
410 fc_stats->lip_count = data->lip;
411 fc_stats->nos_count = data->nos;
412 fc_stats->error_frames = data->error_frames;
413 fc_stats->dumped_frames = data->dumped_frames;
414 fc_stats->link_failure_count = data->link_failure;
415 fc_stats->loss_of_sync_count = data->loss_of_sync;
416 fc_stats->loss_of_signal_count = data->loss_of_signal;
417 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
418 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
419 fc_stats->invalid_crc_count = data->invalid_crcs;
420 fc_stats->fcp_input_requests = data->input_requests;
421 fc_stats->fcp_output_requests = data->output_requests;
422 fc_stats->fcp_control_requests = data->control_requests;
423 fc_stats->fcp_input_megabytes = data->input_mb;
424 fc_stats->fcp_output_megabytes = data->output_mb;
427 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
429 struct zfcp_adapter *adapter;
430 struct fc_host_statistics *fc_stats;
431 struct fsf_qtcb_bottom_port *data;
434 adapter = (struct zfcp_adapter *)host->hostdata[0];
435 fc_stats = zfcp_init_fc_host_stats(adapter);
439 data = kzalloc(sizeof(*data), GFP_KERNEL);
443 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
449 if (adapter->stats_reset &&
450 ((jiffies/HZ - adapter->stats_reset) <
451 data->seconds_since_last_reset))
452 zfcp_adjust_fc_host_stats(fc_stats, data,
453 adapter->stats_reset_data);
455 zfcp_set_fc_host_stats(fc_stats, data);
461 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
463 struct zfcp_adapter *adapter;
464 struct fsf_qtcb_bottom_port *data;
467 adapter = (struct zfcp_adapter *)shost->hostdata[0];
468 data = kzalloc(sizeof(*data), GFP_KERNEL);
472 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
476 adapter->stats_reset = jiffies/HZ;
477 kfree(adapter->stats_reset_data);
478 adapter->stats_reset_data = data; /* finally freed in
483 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
485 struct zfcp_adapter *adapter =
486 (struct zfcp_adapter *)shost->hostdata[0];
487 int status = atomic_read(&adapter->status);
489 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
490 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
491 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
492 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
493 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
494 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
495 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
497 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
500 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
502 rport->dev_loss_tmo = timeout;
506 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
507 * @rport: The FC rport where to teminate I/O
509 * Abort all pending SCSI commands for a port by closing the
510 * port. Using a reopen avoiding a conflict with a shutdown
511 * overwriting a reopen.
513 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
515 struct zfcp_port *port;
516 struct Scsi_Host *shost = rport_to_shost(rport);
517 struct zfcp_adapter *adapter =
518 (struct zfcp_adapter *)shost->hostdata[0];
520 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
523 zfcp_erp_port_reopen(port, 0, "sctrpi1", NULL);
524 put_device(&port->sysfs_device);
528 static void zfcp_scsi_rport_register(struct zfcp_port *port)
530 struct fc_rport_identifiers ids;
531 struct fc_rport *rport;
536 ids.node_name = port->wwnn;
537 ids.port_name = port->wwpn;
538 ids.port_id = port->d_id;
539 ids.roles = FC_RPORT_ROLE_FCP_TARGET;
541 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
543 dev_err(&port->adapter->ccw_device->dev,
544 "Registering port 0x%016Lx failed\n",
545 (unsigned long long)port->wwpn);
549 rport->maxframe_size = port->maxframe_size;
550 rport->supported_classes = port->supported_classes;
554 static void zfcp_scsi_rport_block(struct zfcp_port *port)
556 struct fc_rport *rport = port->rport;
559 fc_remote_port_delete(rport);
564 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
566 get_device(&port->sysfs_device);
567 port->rport_task = RPORT_ADD;
569 if (!queue_work(port->adapter->work_queue, &port->rport_work))
570 put_device(&port->sysfs_device);
573 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
575 get_device(&port->sysfs_device);
576 port->rport_task = RPORT_DEL;
578 if (port->rport && queue_work(port->adapter->work_queue,
582 put_device(&port->sysfs_device);
585 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
588 struct zfcp_port *port;
590 read_lock_irqsave(&adapter->port_list_lock, flags);
591 list_for_each_entry(port, &adapter->port_list, list)
592 zfcp_scsi_schedule_rport_block(port);
593 read_unlock_irqrestore(&adapter->port_list_lock, flags);
596 void zfcp_scsi_rport_work(struct work_struct *work)
598 struct zfcp_port *port = container_of(work, struct zfcp_port,
601 while (port->rport_task) {
602 if (port->rport_task == RPORT_ADD) {
603 port->rport_task = RPORT_NONE;
604 zfcp_scsi_rport_register(port);
606 port->rport_task = RPORT_NONE;
607 zfcp_scsi_rport_block(port);
611 put_device(&port->sysfs_device);
615 void zfcp_scsi_scan(struct work_struct *work)
617 struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
619 struct fc_rport *rport;
621 flush_work(&unit->port->rport_work);
622 rport = unit->port->rport;
624 if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
625 scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
626 scsilun_to_int((struct scsi_lun *)
629 put_device(&unit->sysfs_device);
632 struct fc_function_template zfcp_transport_functions = {
633 .show_starget_port_id = 1,
634 .show_starget_port_name = 1,
635 .show_starget_node_name = 1,
636 .show_rport_supported_classes = 1,
637 .show_rport_maxframe_size = 1,
638 .show_rport_dev_loss_tmo = 1,
639 .show_host_node_name = 1,
640 .show_host_port_name = 1,
641 .show_host_permanent_port_name = 1,
642 .show_host_supported_classes = 1,
643 .show_host_supported_fc4s = 1,
644 .show_host_supported_speeds = 1,
645 .show_host_maxframe_size = 1,
646 .show_host_serial_number = 1,
647 .get_fc_host_stats = zfcp_get_fc_host_stats,
648 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
649 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
650 .get_host_port_state = zfcp_get_host_port_state,
651 .terminate_rport_io = zfcp_scsi_terminate_rport_io,
652 .show_host_port_state = 1,
653 .show_host_active_fc4s = 1,
654 .bsg_request = zfcp_fc_exec_bsg_job,
655 /* no functions registered for following dynamic attributes but
656 directly set by LLDD */
657 .show_host_port_type = 1,
658 .show_host_speed = 1,
659 .show_host_port_id = 1,
660 .disable_target_scan = 1,
661 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
664 struct zfcp_data zfcp_data = {
665 .scsi_host_template = {
667 .module = THIS_MODULE,
669 .change_queue_depth = zfcp_scsi_change_queue_depth,
670 .slave_alloc = zfcp_scsi_slave_alloc,
671 .slave_configure = zfcp_scsi_slave_configure,
672 .slave_destroy = zfcp_scsi_slave_destroy,
673 .queuecommand = zfcp_scsi_queuecommand,
674 .eh_abort_handler = zfcp_scsi_eh_abort_handler,
675 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
676 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
677 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
680 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
683 .sdev_attrs = zfcp_sysfs_sdev_attrs,
684 .max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8),
685 .shost_attrs = zfcp_sysfs_shost_attrs,