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