1 /*
2 * zfcp device driver
3 *
4 * Interface to Linux SCSI midlayer.
5 *
6 * Copyright IBM Corporation 2002, 2008
7 */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include "zfcp_ext.h"
13 #include <asm/atomic.h>
14
15 /* Find start of Sense Information in FCP response unit*/
zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu * fcp_rsp_iu)16 char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
17 {
18 char *fcp_sns_info_ptr;
19
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;
23
24 return fcp_sns_info_ptr;
25 }
26
zfcp_scsi_slave_destroy(struct scsi_device * sdpnt)27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
28 {
29 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
30 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
31 unit->device = NULL;
32 zfcp_erp_unit_failed(unit, 12, NULL);
33 zfcp_unit_put(unit);
34 }
35
zfcp_scsi_slave_configure(struct scsi_device * sdp)36 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
37 {
38 if (sdp->tagged_supported)
39 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
40 else
41 scsi_adjust_queue_depth(sdp, 0, 1);
42 return 0;
43 }
44
zfcp_scsi_command_fail(struct scsi_cmnd * scpnt,int result)45 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
46 {
47 set_host_byte(scpnt, result);
48 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
49 zfcp_scsi_dbf_event_result("fail", 4,
50 (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
51 scpnt, NULL);
52 /* return directly */
53 scpnt->scsi_done(scpnt);
54 }
55
zfcp_scsi_queuecommand(struct scsi_cmnd * scpnt,void (* done)(struct scsi_cmnd *))56 static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
57 void (*done) (struct scsi_cmnd *))
58 {
59 struct zfcp_unit *unit;
60 struct zfcp_adapter *adapter;
61 int status;
62 int ret;
63
64 /* reset the status for this request */
65 scpnt->result = 0;
66 scpnt->host_scribble = NULL;
67 scpnt->scsi_done = done;
68
69 /*
70 * figure out adapter and target device
71 * (stored there by zfcp_scsi_slave_alloc)
72 */
73 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
74 unit = scpnt->device->hostdata;
75
76 BUG_ON(!adapter || (adapter != unit->port->adapter));
77 BUG_ON(!scpnt->scsi_done);
78
79 if (unlikely(!unit)) {
80 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
81 return 0;
82 }
83
84 status = atomic_read(&unit->status);
85 if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
86 !(status & ZFCP_STATUS_COMMON_RUNNING))) {
87 zfcp_scsi_command_fail(scpnt, DID_ERROR);
88 return 0;;
89 }
90
91 ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
92 ZFCP_REQ_AUTO_CLEANUP);
93 if (unlikely(ret == -EBUSY))
94 return SCSI_MLQUEUE_DEVICE_BUSY;
95 else if (unlikely(ret < 0))
96 return SCSI_MLQUEUE_HOST_BUSY;
97
98 return ret;
99 }
100
zfcp_unit_lookup(struct zfcp_adapter * adapter,int channel,unsigned int id,unsigned int lun)101 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
102 int channel, unsigned int id,
103 unsigned int lun)
104 {
105 struct zfcp_port *port;
106 struct zfcp_unit *unit;
107 int scsi_lun;
108
109 list_for_each_entry(port, &adapter->port_list_head, list) {
110 if (!port->rport || (id != port->rport->scsi_target_id))
111 continue;
112 list_for_each_entry(unit, &port->unit_list_head, list) {
113 scsi_lun = scsilun_to_int(
114 (struct scsi_lun *)&unit->fcp_lun);
115 if (lun == scsi_lun)
116 return unit;
117 }
118 }
119
120 return NULL;
121 }
122
zfcp_scsi_slave_alloc(struct scsi_device * sdp)123 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
124 {
125 struct zfcp_adapter *adapter;
126 struct zfcp_unit *unit;
127 unsigned long flags;
128 int retval = -ENXIO;
129
130 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
131 if (!adapter)
132 goto out;
133
134 read_lock_irqsave(&zfcp_data.config_lock, flags);
135 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
136 if (unit &&
137 (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
138 sdp->hostdata = unit;
139 unit->device = sdp;
140 zfcp_unit_get(unit);
141 retval = 0;
142 }
143 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
144 out:
145 return retval;
146 }
147
zfcp_scsi_eh_abort_handler(struct scsi_cmnd * scpnt)148 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
149 {
150 struct Scsi_Host *scsi_host;
151 struct zfcp_adapter *adapter;
152 struct zfcp_unit *unit;
153 struct zfcp_fsf_req *fsf_req;
154 unsigned long flags;
155 unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
156 int retval = SUCCESS;
157
158 scsi_host = scpnt->device->host;
159 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
160 unit = scpnt->device->hostdata;
161
162 /* avoid race condition between late normal completion and abort */
163 write_lock_irqsave(&adapter->abort_lock, flags);
164
165 /* Check whether corresponding fsf_req is still pending */
166 spin_lock(&adapter->req_list_lock);
167 fsf_req = zfcp_reqlist_find(adapter, old_req_id);
168 spin_unlock(&adapter->req_list_lock);
169 if (!fsf_req) {
170 write_unlock_irqrestore(&adapter->abort_lock, flags);
171 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
172 return retval;
173 }
174 fsf_req->data = NULL;
175
176 /* don't access old fsf_req after releasing the abort_lock */
177 write_unlock_irqrestore(&adapter->abort_lock, flags);
178
179 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
180 if (!fsf_req) {
181 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
182 old_req_id);
183 retval = FAILED;
184 return retval;
185 }
186
187 __wait_event(fsf_req->completion_wq,
188 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
189
190 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
191 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
192 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
193 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
194 } else {
195 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
196 retval = FAILED;
197 }
198 zfcp_fsf_req_free(fsf_req);
199
200 return retval;
201 }
202
zfcp_task_mgmt_function(struct zfcp_unit * unit,u8 tm_flags,struct scsi_cmnd * scpnt)203 static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
204 struct scsi_cmnd *scpnt)
205 {
206 struct zfcp_adapter *adapter = unit->port->adapter;
207 struct zfcp_fsf_req *fsf_req;
208 int retval = SUCCESS;
209
210 /* issue task management function */
211 fsf_req = zfcp_fsf_send_fcp_ctm(adapter, unit, tm_flags, 0);
212 if (!fsf_req) {
213 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
214 return FAILED;
215 }
216
217 __wait_event(fsf_req->completion_wq,
218 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
219
220 /*
221 * check completion status of task management function
222 */
223 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
224 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
225 retval = FAILED;
226 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
227 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
228 retval = FAILED;
229 } else
230 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
231
232 zfcp_fsf_req_free(fsf_req);
233
234 return retval;
235 }
236
zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd * scpnt)237 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
238 {
239 struct zfcp_unit *unit = scpnt->device->hostdata;
240
241 if (!unit) {
242 WARN_ON(1);
243 return SUCCESS;
244 }
245 return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
246 }
247
zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd * scpnt)248 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
249 {
250 struct zfcp_unit *unit = scpnt->device->hostdata;
251
252 if (!unit) {
253 WARN_ON(1);
254 return SUCCESS;
255 }
256 return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
257 }
258
zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd * scpnt)259 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
260 {
261 struct zfcp_unit *unit;
262 struct zfcp_adapter *adapter;
263
264 unit = scpnt->device->hostdata;
265 adapter = unit->port->adapter;
266 zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
267 zfcp_erp_wait(adapter);
268
269 return SUCCESS;
270 }
271
zfcp_adapter_scsi_register(struct zfcp_adapter * adapter)272 int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
273 {
274 struct ccw_dev_id dev_id;
275
276 if (adapter->scsi_host)
277 return 0;
278
279 ccw_device_get_id(adapter->ccw_device, &dev_id);
280 /* register adapter as SCSI host with mid layer of SCSI stack */
281 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
282 sizeof (struct zfcp_adapter *));
283 if (!adapter->scsi_host) {
284 dev_err(&adapter->ccw_device->dev,
285 "Registering the FCP device with the "
286 "SCSI stack failed\n");
287 return -EIO;
288 }
289
290 /* tell the SCSI stack some characteristics of this adapter */
291 adapter->scsi_host->max_id = 1;
292 adapter->scsi_host->max_lun = 1;
293 adapter->scsi_host->max_channel = 0;
294 adapter->scsi_host->unique_id = dev_id.devno;
295 adapter->scsi_host->max_cmd_len = 255;
296 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
297
298 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
299
300 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
301 scsi_host_put(adapter->scsi_host);
302 return -EIO;
303 }
304
305 return 0;
306 }
307
zfcp_adapter_scsi_unregister(struct zfcp_adapter * adapter)308 void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
309 {
310 struct Scsi_Host *shost;
311 struct zfcp_port *port;
312
313 shost = adapter->scsi_host;
314 if (!shost)
315 return;
316
317 read_lock_irq(&zfcp_data.config_lock);
318 list_for_each_entry(port, &adapter->port_list_head, list)
319 if (port->rport)
320 port->rport = NULL;
321
322 read_unlock_irq(&zfcp_data.config_lock);
323 fc_remove_host(shost);
324 scsi_remove_host(shost);
325 scsi_host_put(shost);
326 adapter->scsi_host = NULL;
327
328 return;
329 }
330
331 static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter * adapter)332 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
333 {
334 struct fc_host_statistics *fc_stats;
335
336 if (!adapter->fc_stats) {
337 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
338 if (!fc_stats)
339 return NULL;
340 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
341 }
342 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
343 return adapter->fc_stats;
344 }
345
zfcp_adjust_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data,struct fsf_qtcb_bottom_port * old)346 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
347 struct fsf_qtcb_bottom_port *data,
348 struct fsf_qtcb_bottom_port *old)
349 {
350 fc_stats->seconds_since_last_reset =
351 data->seconds_since_last_reset - old->seconds_since_last_reset;
352 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
353 fc_stats->tx_words = data->tx_words - old->tx_words;
354 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
355 fc_stats->rx_words = data->rx_words - old->rx_words;
356 fc_stats->lip_count = data->lip - old->lip;
357 fc_stats->nos_count = data->nos - old->nos;
358 fc_stats->error_frames = data->error_frames - old->error_frames;
359 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
360 fc_stats->link_failure_count = data->link_failure - old->link_failure;
361 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
362 fc_stats->loss_of_signal_count =
363 data->loss_of_signal - old->loss_of_signal;
364 fc_stats->prim_seq_protocol_err_count =
365 data->psp_error_counts - old->psp_error_counts;
366 fc_stats->invalid_tx_word_count =
367 data->invalid_tx_words - old->invalid_tx_words;
368 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
369 fc_stats->fcp_input_requests =
370 data->input_requests - old->input_requests;
371 fc_stats->fcp_output_requests =
372 data->output_requests - old->output_requests;
373 fc_stats->fcp_control_requests =
374 data->control_requests - old->control_requests;
375 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
376 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
377 }
378
zfcp_set_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data)379 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
380 struct fsf_qtcb_bottom_port *data)
381 {
382 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
383 fc_stats->tx_frames = data->tx_frames;
384 fc_stats->tx_words = data->tx_words;
385 fc_stats->rx_frames = data->rx_frames;
386 fc_stats->rx_words = data->rx_words;
387 fc_stats->lip_count = data->lip;
388 fc_stats->nos_count = data->nos;
389 fc_stats->error_frames = data->error_frames;
390 fc_stats->dumped_frames = data->dumped_frames;
391 fc_stats->link_failure_count = data->link_failure;
392 fc_stats->loss_of_sync_count = data->loss_of_sync;
393 fc_stats->loss_of_signal_count = data->loss_of_signal;
394 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
395 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
396 fc_stats->invalid_crc_count = data->invalid_crcs;
397 fc_stats->fcp_input_requests = data->input_requests;
398 fc_stats->fcp_output_requests = data->output_requests;
399 fc_stats->fcp_control_requests = data->control_requests;
400 fc_stats->fcp_input_megabytes = data->input_mb;
401 fc_stats->fcp_output_megabytes = data->output_mb;
402 }
403
zfcp_get_fc_host_stats(struct Scsi_Host * host)404 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
405 {
406 struct zfcp_adapter *adapter;
407 struct fc_host_statistics *fc_stats;
408 struct fsf_qtcb_bottom_port *data;
409 int ret;
410
411 adapter = (struct zfcp_adapter *)host->hostdata[0];
412 fc_stats = zfcp_init_fc_host_stats(adapter);
413 if (!fc_stats)
414 return NULL;
415
416 data = kzalloc(sizeof(*data), GFP_KERNEL);
417 if (!data)
418 return NULL;
419
420 ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
421 if (ret) {
422 kfree(data);
423 return NULL;
424 }
425
426 if (adapter->stats_reset &&
427 ((jiffies/HZ - adapter->stats_reset) <
428 data->seconds_since_last_reset))
429 zfcp_adjust_fc_host_stats(fc_stats, data,
430 adapter->stats_reset_data);
431 else
432 zfcp_set_fc_host_stats(fc_stats, data);
433
434 kfree(data);
435 return fc_stats;
436 }
437
zfcp_reset_fc_host_stats(struct Scsi_Host * shost)438 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
439 {
440 struct zfcp_adapter *adapter;
441 struct fsf_qtcb_bottom_port *data;
442 int ret;
443
444 adapter = (struct zfcp_adapter *)shost->hostdata[0];
445 data = kzalloc(sizeof(*data), GFP_KERNEL);
446 if (!data)
447 return;
448
449 ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
450 if (ret)
451 kfree(data);
452 else {
453 adapter->stats_reset = jiffies/HZ;
454 kfree(adapter->stats_reset_data);
455 adapter->stats_reset_data = data; /* finally freed in
456 adapter_dequeue */
457 }
458 }
459
zfcp_get_host_port_state(struct Scsi_Host * shost)460 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
461 {
462 struct zfcp_adapter *adapter =
463 (struct zfcp_adapter *)shost->hostdata[0];
464 int status = atomic_read(&adapter->status);
465
466 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
467 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
468 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
469 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
470 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
471 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
472 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
473 else
474 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
475 }
476
zfcp_set_rport_dev_loss_tmo(struct fc_rport * rport,u32 timeout)477 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
478 {
479 rport->dev_loss_tmo = timeout;
480 }
481
482 struct fc_function_template zfcp_transport_functions = {
483 .show_starget_port_id = 1,
484 .show_starget_port_name = 1,
485 .show_starget_node_name = 1,
486 .show_rport_supported_classes = 1,
487 .show_rport_maxframe_size = 1,
488 .show_rport_dev_loss_tmo = 1,
489 .show_host_node_name = 1,
490 .show_host_port_name = 1,
491 .show_host_permanent_port_name = 1,
492 .show_host_supported_classes = 1,
493 .show_host_supported_speeds = 1,
494 .show_host_maxframe_size = 1,
495 .show_host_serial_number = 1,
496 .get_fc_host_stats = zfcp_get_fc_host_stats,
497 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
498 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
499 .get_host_port_state = zfcp_get_host_port_state,
500 .show_host_port_state = 1,
501 /* no functions registered for following dynamic attributes but
502 directly set by LLDD */
503 .show_host_port_type = 1,
504 .show_host_speed = 1,
505 .show_host_port_id = 1,
506 .disable_target_scan = 1,
507 };
508
509 struct zfcp_data zfcp_data = {
510 .scsi_host_template = {
511 .name = "zfcp",
512 .module = THIS_MODULE,
513 .proc_name = "zfcp",
514 .slave_alloc = zfcp_scsi_slave_alloc,
515 .slave_configure = zfcp_scsi_slave_configure,
516 .slave_destroy = zfcp_scsi_slave_destroy,
517 .queuecommand = zfcp_scsi_queuecommand,
518 .eh_abort_handler = zfcp_scsi_eh_abort_handler,
519 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
520 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
521 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
522 .can_queue = 4096,
523 .this_id = -1,
524 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
525 .cmd_per_lun = 1,
526 .use_clustering = 1,
527 .sdev_attrs = zfcp_sysfs_sdev_attrs,
528 .max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8),
529 .shost_attrs = zfcp_sysfs_shost_attrs,
530 },
531 };
532