4 * Interface to Linux SCSI midlayer.
6 * Copyright IBM Corporation 2002, 2008
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <asm/atomic.h>
15 /* Find start of Sense Information in FCP response unit*/
16 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
18 char *fcp_sns_info_ptr;
20 fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
21 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
22 fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
24 return fcp_sns_info_ptr;
27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
29 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
31 zfcp_erp_unit_failed(unit, 12, NULL);
35 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
37 if (sdp->tagged_supported)
38 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
40 scsi_adjust_queue_depth(sdp, 0, 1);
44 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
46 set_host_byte(scpnt, result);
47 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
48 zfcp_scsi_dbf_event_result("fail", 4,
49 (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
52 scpnt->scsi_done(scpnt);
55 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
56 void (*done) (struct scsi_cmnd *))
58 struct zfcp_unit *unit;
59 struct zfcp_adapter *adapter;
63 /* reset the status for this request */
65 scpnt->host_scribble = NULL;
66 scpnt->scsi_done = done;
69 * figure out adapter and target device
70 * (stored there by zfcp_scsi_slave_alloc)
72 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
73 unit = scpnt->device->hostdata;
75 BUG_ON(!adapter || (adapter != unit->port->adapter));
76 BUG_ON(!scpnt->scsi_done);
78 if (unlikely(!unit)) {
79 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
83 status = atomic_read(&unit->status);
84 if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
85 !(status & ZFCP_STATUS_COMMON_RUNNING))) {
86 zfcp_scsi_command_fail(scpnt, DID_ERROR);
90 ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
91 ZFCP_REQ_AUTO_CLEANUP);
92 if (unlikely(ret == -EBUSY))
93 return SCSI_MLQUEUE_DEVICE_BUSY;
94 else if (unlikely(ret < 0))
95 return SCSI_MLQUEUE_HOST_BUSY;
100 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
101 int channel, unsigned int id,
104 struct zfcp_port *port;
105 struct zfcp_unit *unit;
108 list_for_each_entry(port, &adapter->port_list_head, list) {
109 if (!port->rport || (id != port->rport->scsi_target_id))
111 list_for_each_entry(unit, &port->unit_list_head, list) {
112 scsi_lun = scsilun_to_int(
113 (struct scsi_lun *)&unit->fcp_lun);
122 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
124 struct zfcp_adapter *adapter;
125 struct zfcp_unit *unit;
129 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
133 read_lock_irqsave(&zfcp_data.config_lock, flags);
134 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
136 sdp->hostdata = unit;
141 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
146 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
148 struct Scsi_Host *scsi_host;
149 struct zfcp_adapter *adapter;
150 struct zfcp_unit *unit;
151 struct zfcp_fsf_req *fsf_req;
153 unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
154 int retval = SUCCESS;
156 scsi_host = scpnt->device->host;
157 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
158 unit = scpnt->device->hostdata;
160 /* avoid race condition between late normal completion and abort */
161 write_lock_irqsave(&adapter->abort_lock, flags);
163 /* Check whether corresponding fsf_req is still pending */
164 spin_lock(&adapter->req_list_lock);
165 fsf_req = zfcp_reqlist_find(adapter, old_req_id);
166 spin_unlock(&adapter->req_list_lock);
168 write_unlock_irqrestore(&adapter->abort_lock, flags);
169 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
172 fsf_req->data = NULL;
174 /* don't access old fsf_req after releasing the abort_lock */
175 write_unlock_irqrestore(&adapter->abort_lock, flags);
177 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
179 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
185 __wait_event(fsf_req->completion_wq,
186 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
188 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
189 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
190 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
191 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
193 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
196 zfcp_fsf_req_free(fsf_req);
201 static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
202 struct scsi_cmnd *scpnt)
204 struct zfcp_adapter *adapter = unit->port->adapter;
205 struct zfcp_fsf_req *fsf_req;
206 int retval = SUCCESS;
208 /* issue task management function */
209 fsf_req = zfcp_fsf_send_fcp_ctm(adapter, unit, tm_flags, 0);
211 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
215 __wait_event(fsf_req->completion_wq,
216 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
219 * check completion status of task management function
221 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
222 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
224 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
225 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
228 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
230 zfcp_fsf_req_free(fsf_req);
235 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
237 struct zfcp_unit *unit = scpnt->device->hostdata;
243 return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
246 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
248 struct zfcp_unit *unit = scpnt->device->hostdata;
254 return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
257 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
259 struct zfcp_unit *unit;
260 struct zfcp_adapter *adapter;
262 unit = scpnt->device->hostdata;
263 adapter = unit->port->adapter;
264 zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
265 zfcp_erp_wait(adapter);
270 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
272 struct ccw_dev_id dev_id;
274 if (adapter->scsi_host)
277 ccw_device_get_id(adapter->ccw_device, &dev_id);
278 /* register adapter as SCSI host with mid layer of SCSI stack */
279 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
280 sizeof (struct zfcp_adapter *));
281 if (!adapter->scsi_host) {
282 dev_err(&adapter->ccw_device->dev,
283 "Registering the FCP device with the "
284 "SCSI stack failed\n");
288 /* tell the SCSI stack some characteristics of this adapter */
289 adapter->scsi_host->max_id = 1;
290 adapter->scsi_host->max_lun = 1;
291 adapter->scsi_host->max_channel = 0;
292 adapter->scsi_host->unique_id = dev_id.devno;
293 adapter->scsi_host->max_cmd_len = 255;
294 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
296 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
298 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
299 scsi_host_put(adapter->scsi_host);
306 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
308 struct Scsi_Host *shost;
309 struct zfcp_port *port;
311 shost = adapter->scsi_host;
315 read_lock_irq(&zfcp_data.config_lock);
316 list_for_each_entry(port, &adapter->port_list_head, list)
320 read_unlock_irq(&zfcp_data.config_lock);
321 fc_remove_host(shost);
322 scsi_remove_host(shost);
323 scsi_host_put(shost);
324 adapter->scsi_host = NULL;
329 static struct fc_host_statistics*
330 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
332 struct fc_host_statistics *fc_stats;
334 if (!adapter->fc_stats) {
335 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
338 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
340 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
341 return adapter->fc_stats;
344 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
345 struct fsf_qtcb_bottom_port *data,
346 struct fsf_qtcb_bottom_port *old)
348 fc_stats->seconds_since_last_reset =
349 data->seconds_since_last_reset - old->seconds_since_last_reset;
350 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
351 fc_stats->tx_words = data->tx_words - old->tx_words;
352 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
353 fc_stats->rx_words = data->rx_words - old->rx_words;
354 fc_stats->lip_count = data->lip - old->lip;
355 fc_stats->nos_count = data->nos - old->nos;
356 fc_stats->error_frames = data->error_frames - old->error_frames;
357 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
358 fc_stats->link_failure_count = data->link_failure - old->link_failure;
359 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
360 fc_stats->loss_of_signal_count =
361 data->loss_of_signal - old->loss_of_signal;
362 fc_stats->prim_seq_protocol_err_count =
363 data->psp_error_counts - old->psp_error_counts;
364 fc_stats->invalid_tx_word_count =
365 data->invalid_tx_words - old->invalid_tx_words;
366 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
367 fc_stats->fcp_input_requests =
368 data->input_requests - old->input_requests;
369 fc_stats->fcp_output_requests =
370 data->output_requests - old->output_requests;
371 fc_stats->fcp_control_requests =
372 data->control_requests - old->control_requests;
373 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
374 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
377 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
378 struct fsf_qtcb_bottom_port *data)
380 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
381 fc_stats->tx_frames = data->tx_frames;
382 fc_stats->tx_words = data->tx_words;
383 fc_stats->rx_frames = data->rx_frames;
384 fc_stats->rx_words = data->rx_words;
385 fc_stats->lip_count = data->lip;
386 fc_stats->nos_count = data->nos;
387 fc_stats->error_frames = data->error_frames;
388 fc_stats->dumped_frames = data->dumped_frames;
389 fc_stats->link_failure_count = data->link_failure;
390 fc_stats->loss_of_sync_count = data->loss_of_sync;
391 fc_stats->loss_of_signal_count = data->loss_of_signal;
392 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
393 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
394 fc_stats->invalid_crc_count = data->invalid_crcs;
395 fc_stats->fcp_input_requests = data->input_requests;
396 fc_stats->fcp_output_requests = data->output_requests;
397 fc_stats->fcp_control_requests = data->control_requests;
398 fc_stats->fcp_input_megabytes = data->input_mb;
399 fc_stats->fcp_output_megabytes = data->output_mb;
402 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
404 struct zfcp_adapter *adapter;
405 struct fc_host_statistics *fc_stats;
406 struct fsf_qtcb_bottom_port *data;
409 adapter = (struct zfcp_adapter *)host->hostdata[0];
410 fc_stats = zfcp_init_fc_host_stats(adapter);
414 data = kzalloc(sizeof(*data), GFP_KERNEL);
418 ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
424 if (adapter->stats_reset &&
425 ((jiffies/HZ - adapter->stats_reset) <
426 data->seconds_since_last_reset))
427 zfcp_adjust_fc_host_stats(fc_stats, data,
428 adapter->stats_reset_data);
430 zfcp_set_fc_host_stats(fc_stats, data);
436 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
438 struct zfcp_adapter *adapter;
439 struct fsf_qtcb_bottom_port *data;
442 adapter = (struct zfcp_adapter *)shost->hostdata[0];
443 data = kzalloc(sizeof(*data), GFP_KERNEL);
447 ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
451 adapter->stats_reset = jiffies/HZ;
452 kfree(adapter->stats_reset_data);
453 adapter->stats_reset_data = data; /* finally freed in
458 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
460 struct zfcp_adapter *adapter =
461 (struct zfcp_adapter *)shost->hostdata[0];
462 int status = atomic_read(&adapter->status);
464 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
465 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
466 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
467 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
468 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
469 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
470 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
472 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
475 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
477 rport->dev_loss_tmo = timeout;
480 struct fc_function_template zfcp_transport_functions = {
481 .show_starget_port_id = 1,
482 .show_starget_port_name = 1,
483 .show_starget_node_name = 1,
484 .show_rport_supported_classes = 1,
485 .show_rport_maxframe_size = 1,
486 .show_rport_dev_loss_tmo = 1,
487 .show_host_node_name = 1,
488 .show_host_port_name = 1,
489 .show_host_permanent_port_name = 1,
490 .show_host_supported_classes = 1,
491 .show_host_supported_speeds = 1,
492 .show_host_maxframe_size = 1,
493 .show_host_serial_number = 1,
494 .get_fc_host_stats = zfcp_get_fc_host_stats,
495 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
496 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
497 .get_host_port_state = zfcp_get_host_port_state,
498 .show_host_port_state = 1,
499 /* no functions registered for following dynamic attributes but
500 directly set by LLDD */
501 .show_host_port_type = 1,
502 .show_host_speed = 1,
503 .show_host_port_id = 1,
504 .disable_target_scan = 1,
507 struct zfcp_data zfcp_data = {
508 .scsi_host_template = {
510 .module = THIS_MODULE,
512 .slave_alloc = zfcp_scsi_slave_alloc,
513 .slave_configure = zfcp_scsi_slave_configure,
514 .slave_destroy = zfcp_scsi_slave_destroy,
515 .queuecommand = zfcp_scsi_queuecommand,
516 .eh_abort_handler = zfcp_scsi_eh_abort_handler,
517 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
518 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
519 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
522 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
525 .sdev_attrs = zfcp_sysfs_sdev_attrs,
526 .max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8),
527 .shost_attrs = zfcp_sysfs_shost_attrs,