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[linux-2.6] / drivers / s390 / scsi / zfcp_scsi.c
1 /* 
2  * This file is part of the zfcp device driver for
3  * FCP adapters for IBM System z9 and zSeries.
4  *
5  * (C) Copyright IBM Corp. 2002, 2006
6  * 
7  * This program is free software; you can redistribute it and/or modify 
8  * it under the terms of the GNU General Public License as published by 
9  * the Free Software Foundation; either version 2, or (at your option) 
10  * any later version. 
11  * 
12  * This program is distributed in the hope that it will be useful, 
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of 
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
15  * GNU General Public License for more details. 
16  * 
17  * You should have received a copy of the GNU General Public License 
18  * along with this program; if not, write to the Free Software 
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
20  */
21
22 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
23
24 #include "zfcp_ext.h"
25 #include <asm/atomic.h>
26
27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
28 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
29 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
30 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
31                                   void (*done) (struct scsi_cmnd *));
32 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
33 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
34 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
35 static int zfcp_task_management_function(struct zfcp_unit *, u8,
36                                          struct scsi_cmnd *);
37
38 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
39                                           unsigned int, unsigned int);
40
41 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
42
43 struct zfcp_data zfcp_data = {
44         .scsi_host_template = {
45                 .name                   = ZFCP_NAME,
46                 .module                 = THIS_MODULE,
47                 .proc_name              = "zfcp",
48                 .slave_alloc            = zfcp_scsi_slave_alloc,
49                 .slave_configure        = zfcp_scsi_slave_configure,
50                 .slave_destroy          = zfcp_scsi_slave_destroy,
51                 .queuecommand           = zfcp_scsi_queuecommand,
52                 .eh_abort_handler       = zfcp_scsi_eh_abort_handler,
53                 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
54                 .eh_bus_reset_handler   = zfcp_scsi_eh_host_reset_handler,
55                 .eh_host_reset_handler  = zfcp_scsi_eh_host_reset_handler,
56                 .can_queue              = 4096,
57                 .this_id                = -1,
58                 .sg_tablesize           = ZFCP_MAX_SBALES_PER_REQ,
59                 .cmd_per_lun            = 1,
60                 .use_clustering         = 1,
61                 .sdev_attrs             = zfcp_sysfs_sdev_attrs,
62                 .max_sectors            = ZFCP_MAX_SECTORS,
63         },
64         .driver_version = ZFCP_VERSION,
65 };
66
67 /* Find start of Response Information in FCP response unit*/
68 char *
69 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
70 {
71         char *fcp_rsp_info_ptr;
72
73         fcp_rsp_info_ptr =
74             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
75
76         return fcp_rsp_info_ptr;
77 }
78
79 /* Find start of Sense Information in FCP response unit*/
80 char *
81 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
82 {
83         char *fcp_sns_info_ptr;
84
85         fcp_sns_info_ptr =
86             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
87         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
88                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
89                     fcp_rsp_iu->fcp_rsp_len;
90
91         return fcp_sns_info_ptr;
92 }
93
94 static fcp_dl_t *
95 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
96 {
97         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
98         fcp_dl_t *fcp_dl_addr;
99
100         fcp_dl_addr = (fcp_dl_t *)
101                 ((unsigned char *) fcp_cmd +
102                  sizeof (struct fcp_cmnd_iu) + additional_length);
103         /*
104          * fcp_dl_addr = start address of fcp_cmnd structure + 
105          * size of fixed part + size of dynamically sized add_dcp_cdb field
106          * SEE FCP-2 documentation
107          */
108         return fcp_dl_addr;
109 }
110
111 fcp_dl_t
112 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
113 {
114         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
115 }
116
117 void
118 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
119 {
120         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
121 }
122
123 /*
124  * note: it's a bit-or operation not an assignment
125  * regarding the specified byte
126  */
127 static inline void
128 set_byte(int *result, char status, char pos)
129 {
130         *result |= status << (pos * 8);
131 }
132
133 void
134 set_host_byte(int *result, char status)
135 {
136         set_byte(result, status, 2);
137 }
138
139 void
140 set_driver_byte(int *result, char status)
141 {
142         set_byte(result, status, 3);
143 }
144
145 static int
146 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
147 {
148         struct zfcp_adapter *adapter;
149         struct zfcp_unit *unit;
150         unsigned long flags;
151         int retval = -ENXIO;
152
153         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
154         if (!adapter)
155                 goto out;
156
157         read_lock_irqsave(&zfcp_data.config_lock, flags);
158         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
159         if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
160                                      &unit->status)) {
161                 sdp->hostdata = unit;
162                 unit->device = sdp;
163                 zfcp_unit_get(unit);
164                 retval = 0;
165         }
166         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
167  out:
168         return retval;
169 }
170
171 /**
172  * zfcp_scsi_slave_destroy - called when scsi device is removed
173  *
174  * Remove reference to associated scsi device for an zfcp_unit.
175  * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
176  * or a scan for this device might have failed.
177  */
178 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
179 {
180         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
181
182         if (unit) {
183                 zfcp_erp_wait(unit->port->adapter);
184                 wait_event(unit->scsi_scan_wq,
185                            atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING,
186                                             &unit->status) == 0);
187                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
188                 sdpnt->hostdata = NULL;
189                 unit->device = NULL;
190                 zfcp_erp_unit_failed(unit);
191                 zfcp_unit_put(unit);
192         } else {
193                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
194                                 "address %p\n", sdpnt);
195         }
196 }
197
198 /* 
199  * called from scsi midlayer to allow finetuning of a device.
200  */
201 static int
202 zfcp_scsi_slave_configure(struct scsi_device *sdp)
203 {
204         if (sdp->tagged_supported)
205                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
206         else
207                 scsi_adjust_queue_depth(sdp, 0, 1);
208         return 0;
209 }
210
211 /**
212  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
213  * @scpnt: pointer to struct scsi_cmnd where result is set
214  * @result: result to be set in scpnt (e.g. DID_ERROR)
215  */
216 static void
217 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
218 {
219         set_host_byte(&scpnt->result, result);
220         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
221                 zfcp_scsi_dbf_event_result("fail", 4,
222                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
223                         scpnt, NULL);
224         /* return directly */
225         scpnt->scsi_done(scpnt);
226 }
227
228 /**
229  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
230  *      zfcp_scsi_command_sync
231  * @adapter: adapter where scsi command is issued
232  * @unit: unit to which scsi command is sent
233  * @scpnt: scsi command to be sent
234  * @timer: timer to be started if request is successfully initiated
235  *
236  * Note: In scsi_done function must be set in scpnt.
237  */
238 int
239 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
240                         struct scsi_cmnd *scpnt, int use_timer)
241 {
242         int tmp;
243         int retval;
244
245         retval = 0;
246
247         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
248         BUG_ON(scpnt->scsi_done == NULL);
249
250         if (unlikely(NULL == unit)) {
251                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
252                 goto out;
253         }
254
255         if (unlikely(
256               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
257              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
258                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
259                                "0x%016Lx on adapter %s\n",
260                                unit->fcp_lun, unit->port->wwpn,
261                                zfcp_get_busid_by_adapter(adapter));
262                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
263                 goto out;
264         }
265
266         if (unlikely(
267              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
268                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
269                                "on port 0x%016Lx in recovery\n",
270                                zfcp_get_busid_by_unit(unit),
271                                unit->fcp_lun, unit->port->wwpn);
272                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
273                 goto out;
274         }
275
276         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
277                                              ZFCP_REQ_AUTO_CLEANUP);
278
279         if (unlikely(tmp < 0)) {
280                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
281                 retval = SCSI_MLQUEUE_HOST_BUSY;
282         }
283
284 out:
285         return retval;
286 }
287
288 static void
289 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
290 {
291         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
292         complete(wait);
293 }
294
295
296 /**
297  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
298  * @unit: unit where command is sent to
299  * @scpnt: scsi command to be sent
300  * @use_timer: indicates whether timer should be setup or not
301  * Return: 0
302  *
303  * Errors are indicated in scpnt->result
304  */
305 int
306 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
307                        int use_timer)
308 {
309         int ret;
310         DECLARE_COMPLETION_ONSTACK(wait);
311
312         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
313         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
314         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
315                                       use_timer);
316         if (ret == 0)
317                 wait_for_completion(&wait);
318
319         scpnt->SCp.ptr = NULL;
320
321         return 0;
322 }
323
324 /*
325  * function:    zfcp_scsi_queuecommand
326  *
327  * purpose:     enqueues a SCSI command to the specified target device
328  *
329  * returns:     0 - success, SCSI command enqueued
330  *              !0 - failure
331  */
332 static int
333 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
334                        void (*done) (struct scsi_cmnd *))
335 {
336         struct zfcp_unit *unit;
337         struct zfcp_adapter *adapter;
338
339         /* reset the status for this request */
340         scpnt->result = 0;
341         scpnt->host_scribble = NULL;
342         scpnt->scsi_done = done;
343
344         /*
345          * figure out adapter and target device
346          * (stored there by zfcp_scsi_slave_alloc)
347          */
348         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
349         unit = (struct zfcp_unit *) scpnt->device->hostdata;
350
351         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
352 }
353
354 static struct zfcp_unit *
355 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
356                  unsigned int lun)
357 {
358         struct zfcp_port *port;
359         struct zfcp_unit *unit, *retval = NULL;
360
361         list_for_each_entry(port, &adapter->port_list_head, list) {
362                 if (!port->rport || (id != port->rport->scsi_target_id))
363                         continue;
364                 list_for_each_entry(unit, &port->unit_list_head, list) {
365                         if (lun == unit->scsi_lun) {
366                                 retval = unit;
367                                 goto out;
368                         }
369                 }
370         }
371  out:
372         return retval;
373 }
374
375 /**
376  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
377  * @scpnt: pointer to scsi_cmnd to be aborted 
378  * Return: SUCCESS - command has been aborted and cleaned up in internal
379  *          bookkeeping, SCSI stack won't be called for aborted command
380  *         FAILED - otherwise
381  *
382  * We do not need to care for a SCSI command which completes normally
383  * but late during this abort routine runs.  We are allowed to return
384  * late commands to the SCSI stack.  It tracks the state of commands and
385  * will handle late commands.  (Usually, the normal completion of late
386  * commands is ignored with respect to the running abort operation.)
387  */
388 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
389 {
390         struct Scsi_Host *scsi_host;
391         struct zfcp_adapter *adapter;
392         struct zfcp_unit *unit;
393         struct zfcp_fsf_req *fsf_req;
394         unsigned long flags;
395         unsigned long old_req_id;
396         int retval = SUCCESS;
397
398         scsi_host = scpnt->device->host;
399         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
400         unit = (struct zfcp_unit *) scpnt->device->hostdata;
401
402         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
403                       scpnt, zfcp_get_busid_by_adapter(adapter));
404
405         /* avoid race condition between late normal completion and abort */
406         write_lock_irqsave(&adapter->abort_lock, flags);
407
408         /* Check whether corresponding fsf_req is still pending */
409         spin_lock(&adapter->req_list_lock);
410         fsf_req = zfcp_reqlist_find(adapter,
411                                     (unsigned long) scpnt->host_scribble);
412         spin_unlock(&adapter->req_list_lock);
413         if (!fsf_req) {
414                 write_unlock_irqrestore(&adapter->abort_lock, flags);
415                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
416                 retval = SUCCESS;
417                 goto out;
418         }
419         fsf_req->data = 0;
420         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
421         old_req_id = fsf_req->req_id;
422
423         /* don't access old fsf_req after releasing the abort_lock */
424         write_unlock_irqrestore(&adapter->abort_lock, flags);
425
426         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
427         if (!fsf_req) {
428                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
429                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
430                                           old_req_id);
431                 retval = FAILED;
432                 goto out;
433         }
434
435         __wait_event(fsf_req->completion_wq,
436                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
437
438         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
439                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
440                 retval = SUCCESS;
441         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
442                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
443                 retval = SUCCESS;
444         } else {
445                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
446                 retval = FAILED;
447         }
448         zfcp_fsf_req_free(fsf_req);
449  out:
450         return retval;
451 }
452
453 static int
454 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
455 {
456         int retval;
457         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
458
459         if (!unit) {
460                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
461                 retval = SUCCESS;
462                 goto out;
463         }
464         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
465
466         /*
467          * If we do not know whether the unit supports 'logical unit reset'
468          * then try 'logical unit reset' and proceed with 'target reset'
469          * if 'logical unit reset' fails.
470          * If the unit is known not to support 'logical unit reset' then
471          * skip 'logical unit reset' and try 'target reset' immediately.
472          */
473         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
474                               &unit->status)) {
475                 retval = zfcp_task_management_function(unit,
476                                                        FCP_LOGICAL_UNIT_RESET,
477                                                        scpnt);
478                 if (retval) {
479                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
480                         if (retval == -ENOTSUPP)
481                                 atomic_set_mask
482                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
483                                      &unit->status);
484                         /* fall through and try 'target reset' next */
485                 } else {
486                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
487                                        unit);
488                         /* avoid 'target reset' */
489                         retval = SUCCESS;
490                         goto out;
491                 }
492         }
493         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
494         if (retval) {
495                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
496                 retval = FAILED;
497         } else {
498                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
499                 retval = SUCCESS;
500         }
501  out:
502         return retval;
503 }
504
505 static int
506 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
507                               struct scsi_cmnd *scpnt)
508 {
509         struct zfcp_adapter *adapter = unit->port->adapter;
510         struct zfcp_fsf_req *fsf_req;
511         int retval = 0;
512
513         /* issue task management function */
514         fsf_req = zfcp_fsf_send_fcp_command_task_management
515                 (adapter, unit, tm_flags, 0);
516         if (!fsf_req) {
517                 ZFCP_LOG_INFO("error: creation of task management request "
518                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
519                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
520                               zfcp_get_busid_by_adapter(adapter));
521                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
522                 retval = -ENOMEM;
523                 goto out;
524         }
525
526         __wait_event(fsf_req->completion_wq,
527                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
528
529         /*
530          * check completion status of task management function
531          */
532         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
533                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
534                 retval = -EIO;
535         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
536                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
537                 retval = -ENOTSUPP;
538         } else
539                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
540
541         zfcp_fsf_req_free(fsf_req);
542  out:
543         return retval;
544 }
545
546 /**
547  * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
548  */
549 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
550 {
551         struct zfcp_unit *unit;
552         struct zfcp_adapter *adapter;
553
554         unit = (struct zfcp_unit*) scpnt->device->hostdata;
555         adapter = unit->port->adapter;
556
557         ZFCP_LOG_NORMAL("host/bus reset because of problems with "
558                         "unit 0x%016Lx\n", unit->fcp_lun);
559
560         zfcp_erp_adapter_reopen(adapter, 0);
561         zfcp_erp_wait(adapter);
562
563         return SUCCESS;
564 }
565
566 int
567 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
568 {
569         int retval = 0;
570         static unsigned int unique_id = 0;
571
572         if (adapter->scsi_host)
573                 goto out;
574
575         /* register adapter as SCSI host with mid layer of SCSI stack */
576         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
577                                              sizeof (struct zfcp_adapter *));
578         if (!adapter->scsi_host) {
579                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
580                                 "for adapter %s ",
581                                 zfcp_get_busid_by_adapter(adapter));
582                 retval = -EIO;
583                 goto out;
584         }
585         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
586
587         /* tell the SCSI stack some characteristics of this adapter */
588         adapter->scsi_host->max_id = 1;
589         adapter->scsi_host->max_lun = 1;
590         adapter->scsi_host->max_channel = 0;
591         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
592         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
593         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
594
595         /*
596          * save a pointer to our own adapter data structure within
597          * hostdata field of SCSI host data structure
598          */
599         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
600
601         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
602                 scsi_host_put(adapter->scsi_host);
603                 retval = -EIO;
604                 goto out;
605         }
606         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
607  out:
608         return retval;
609 }
610
611 void
612 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
613 {
614         struct Scsi_Host *shost;
615         struct zfcp_port *port;
616
617         shost = adapter->scsi_host;
618         if (!shost)
619                 return;
620         read_lock_irq(&zfcp_data.config_lock);
621         list_for_each_entry(port, &adapter->port_list_head, list)
622                 if (port->rport)
623                         port->rport = NULL;
624         read_unlock_irq(&zfcp_data.config_lock);
625         fc_remove_host(shost);
626         scsi_remove_host(shost);
627         scsi_host_put(shost);
628         adapter->scsi_host = NULL;
629         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
630
631         return;
632 }
633
634 /*
635  * Support functions for FC transport class
636  */
637 static struct fc_host_statistics*
638 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
639 {
640         struct fc_host_statistics *fc_stats;
641
642         if (!adapter->fc_stats) {
643                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
644                 if (!fc_stats)
645                         return NULL;
646                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
647         }
648         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
649         return adapter->fc_stats;
650 }
651
652 static void
653 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
654                           struct fsf_qtcb_bottom_port *data,
655                           struct fsf_qtcb_bottom_port *old)
656 {
657         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
658                 old->seconds_since_last_reset;
659         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
660         fc_stats->tx_words = data->tx_words - old->tx_words;
661         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
662         fc_stats->rx_words = data->rx_words - old->rx_words;
663         fc_stats->lip_count = data->lip - old->lip;
664         fc_stats->nos_count = data->nos - old->nos;
665         fc_stats->error_frames = data->error_frames - old->error_frames;
666         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
667         fc_stats->link_failure_count = data->link_failure - old->link_failure;
668         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
669         fc_stats->loss_of_signal_count = data->loss_of_signal -
670                 old->loss_of_signal;
671         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
672                 old->psp_error_counts;
673         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
674                 old->invalid_tx_words;
675         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
676         fc_stats->fcp_input_requests = data->input_requests -
677                 old->input_requests;
678         fc_stats->fcp_output_requests = data->output_requests -
679                 old->output_requests;
680         fc_stats->fcp_control_requests = data->control_requests -
681                 old->control_requests;
682         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
683         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
684 }
685
686 static void
687 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
688                        struct fsf_qtcb_bottom_port *data)
689 {
690         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
691         fc_stats->tx_frames = data->tx_frames;
692         fc_stats->tx_words = data->tx_words;
693         fc_stats->rx_frames = data->rx_frames;
694         fc_stats->rx_words = data->rx_words;
695         fc_stats->lip_count = data->lip;
696         fc_stats->nos_count = data->nos;
697         fc_stats->error_frames = data->error_frames;
698         fc_stats->dumped_frames = data->dumped_frames;
699         fc_stats->link_failure_count = data->link_failure;
700         fc_stats->loss_of_sync_count = data->loss_of_sync;
701         fc_stats->loss_of_signal_count = data->loss_of_signal;
702         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
703         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
704         fc_stats->invalid_crc_count = data->invalid_crcs;
705         fc_stats->fcp_input_requests = data->input_requests;
706         fc_stats->fcp_output_requests = data->output_requests;
707         fc_stats->fcp_control_requests = data->control_requests;
708         fc_stats->fcp_input_megabytes = data->input_mb;
709         fc_stats->fcp_output_megabytes = data->output_mb;
710 }
711
712 /**
713  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
714  *
715  * assumption: scsi_transport_fc synchronizes calls of
716  *             get_fc_host_stats and reset_fc_host_stats
717  *             (XXX to be checked otherwise introduce locking)
718  */
719 static struct fc_host_statistics *
720 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
721 {
722         struct zfcp_adapter *adapter;
723         struct fc_host_statistics *fc_stats;
724         struct fsf_qtcb_bottom_port *data;
725         int ret;
726
727         adapter = (struct zfcp_adapter *)shost->hostdata[0];
728         fc_stats = zfcp_init_fc_host_stats(adapter);
729         if (!fc_stats)
730                 return NULL;
731
732         data = kzalloc(sizeof(*data), GFP_KERNEL);
733         if (!data)
734                 return NULL;
735
736         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
737         if (ret) {
738                 kfree(data);
739                 return NULL; /* XXX return zeroed fc_stats? */
740         }
741
742         if (adapter->stats_reset &&
743             ((jiffies/HZ - adapter->stats_reset) <
744              data->seconds_since_last_reset)) {
745                 zfcp_adjust_fc_host_stats(fc_stats, data,
746                                           adapter->stats_reset_data);
747         } else
748                 zfcp_set_fc_host_stats(fc_stats, data);
749
750         kfree(data);
751         return fc_stats;
752 }
753
754 static void
755 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
756 {
757         struct zfcp_adapter *adapter;
758         struct fsf_qtcb_bottom_port *data, *old_data;
759         int ret;
760
761         adapter = (struct zfcp_adapter *)shost->hostdata[0];
762         data = kzalloc(sizeof(*data), GFP_KERNEL);
763         if (!data)
764                 return;
765
766         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
767         if (ret == 0) {
768                 adapter->stats_reset = jiffies/HZ;
769                 old_data = adapter->stats_reset_data;
770                 adapter->stats_reset_data = data; /* finally freed in
771                                                      adater_dequeue */
772                 kfree(old_data);
773         }
774 }
775
776 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
777 {
778         rport->dev_loss_tmo = timeout;
779 }
780
781 struct fc_function_template zfcp_transport_functions = {
782         .show_starget_port_id = 1,
783         .show_starget_port_name = 1,
784         .show_starget_node_name = 1,
785         .show_rport_supported_classes = 1,
786         .show_rport_maxframe_size = 1,
787         .show_rport_dev_loss_tmo = 1,
788         .show_host_node_name = 1,
789         .show_host_port_name = 1,
790         .show_host_permanent_port_name = 1,
791         .show_host_supported_classes = 1,
792         .show_host_supported_speeds = 1,
793         .show_host_maxframe_size = 1,
794         .show_host_serial_number = 1,
795         .get_fc_host_stats = zfcp_get_fc_host_stats,
796         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
797         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
798         /* no functions registered for following dynamic attributes but
799            directly set by LLDD */
800         .show_host_port_type = 1,
801         .show_host_speed = 1,
802         .show_host_port_id = 1,
803 };
804
805 /**
806  * ZFCP_DEFINE_SCSI_ATTR
807  * @_name:   name of show attribute
808  * @_format: format string
809  * @_value:  value to print
810  *
811  * Generates attribute for a unit.
812  */
813 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
814 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
815                                               char *buf)                 \
816 {                                                                        \
817         struct scsi_device *sdev;                                        \
818         struct zfcp_unit *unit;                                          \
819                                                                          \
820         sdev = to_scsi_device(dev);                                      \
821         unit = sdev->hostdata;                                           \
822         return sprintf(buf, _format, _value);                            \
823 }                                                                        \
824                                                                          \
825 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
826
827 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
828 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
829 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
830
831 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
832         &dev_attr_fcp_lun,
833         &dev_attr_wwpn,
834         &dev_attr_hba_id,
835         NULL
836 };
837
838 #undef ZFCP_LOG_AREA