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