Merge branches 'release', 'acpi_pm_device_sleep_state' and 'battery' into release
[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_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                 zfcp_erp_wait(unit->port->adapter);
183                 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
184                 sdpnt->hostdata = NULL;
185                 unit->device = NULL;
186                 zfcp_erp_unit_failed(unit);
187                 zfcp_unit_put(unit);
188         } else
189                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
190                                 "address %p\n", sdpnt);
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         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
262                                              ZFCP_REQ_AUTO_CLEANUP);
263         if (unlikely(tmp == -EBUSY)) {
264                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
265                                "on port 0x%016Lx in recovery\n",
266                                zfcp_get_busid_by_unit(unit),
267                                unit->fcp_lun, unit->port->wwpn);
268                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
269                 goto out;
270         }
271
272         if (unlikely(tmp < 0)) {
273                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
274                 retval = SCSI_MLQUEUE_HOST_BUSY;
275         }
276
277 out:
278         return retval;
279 }
280
281 static void
282 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
283 {
284         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
285         complete(wait);
286 }
287
288
289 /**
290  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
291  * @unit: unit where command is sent to
292  * @scpnt: scsi command to be sent
293  * @use_timer: indicates whether timer should be setup or not
294  * Return: 0
295  *
296  * Errors are indicated in scpnt->result
297  */
298 int
299 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
300                        int use_timer)
301 {
302         int ret;
303         DECLARE_COMPLETION_ONSTACK(wait);
304
305         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
306         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
307         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
308                                       use_timer);
309         if (ret == 0)
310                 wait_for_completion(&wait);
311
312         scpnt->SCp.ptr = NULL;
313
314         return 0;
315 }
316
317 /*
318  * function:    zfcp_scsi_queuecommand
319  *
320  * purpose:     enqueues a SCSI command to the specified target device
321  *
322  * returns:     0 - success, SCSI command enqueued
323  *              !0 - failure
324  */
325 static int
326 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
327                        void (*done) (struct scsi_cmnd *))
328 {
329         struct zfcp_unit *unit;
330         struct zfcp_adapter *adapter;
331
332         /* reset the status for this request */
333         scpnt->result = 0;
334         scpnt->host_scribble = NULL;
335         scpnt->scsi_done = done;
336
337         /*
338          * figure out adapter and target device
339          * (stored there by zfcp_scsi_slave_alloc)
340          */
341         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
342         unit = (struct zfcp_unit *) scpnt->device->hostdata;
343
344         return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
345 }
346
347 static struct zfcp_unit *
348 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
349                  unsigned int lun)
350 {
351         struct zfcp_port *port;
352         struct zfcp_unit *unit, *retval = NULL;
353
354         list_for_each_entry(port, &adapter->port_list_head, list) {
355                 if (!port->rport || (id != port->rport->scsi_target_id))
356                         continue;
357                 list_for_each_entry(unit, &port->unit_list_head, list)
358                         if (lun == unit->scsi_lun) {
359                                 retval = unit;
360                                 goto out;
361                         }
362         }
363  out:
364         return retval;
365 }
366
367 /**
368  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
369  * @scpnt: pointer to scsi_cmnd to be aborted
370  * Return: SUCCESS - command has been aborted and cleaned up in internal
371  *          bookkeeping, SCSI stack won't be called for aborted command
372  *         FAILED - otherwise
373  *
374  * We do not need to care for a SCSI command which completes normally
375  * but late during this abort routine runs.  We are allowed to return
376  * late commands to the SCSI stack.  It tracks the state of commands and
377  * will handle late commands.  (Usually, the normal completion of late
378  * commands is ignored with respect to the running abort operation.)
379  */
380 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
381 {
382         struct Scsi_Host *scsi_host;
383         struct zfcp_adapter *adapter;
384         struct zfcp_unit *unit;
385         struct zfcp_fsf_req *fsf_req;
386         unsigned long flags;
387         unsigned long old_req_id;
388         int retval = SUCCESS;
389
390         scsi_host = scpnt->device->host;
391         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
392         unit = (struct zfcp_unit *) scpnt->device->hostdata;
393
394         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
395                       scpnt, zfcp_get_busid_by_adapter(adapter));
396
397         /* avoid race condition between late normal completion and abort */
398         write_lock_irqsave(&adapter->abort_lock, flags);
399
400         /* Check whether corresponding fsf_req is still pending */
401         spin_lock(&adapter->req_list_lock);
402         fsf_req = zfcp_reqlist_find(adapter,
403                                     (unsigned long) scpnt->host_scribble);
404         spin_unlock(&adapter->req_list_lock);
405         if (!fsf_req) {
406                 write_unlock_irqrestore(&adapter->abort_lock, flags);
407                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
408                 retval = SUCCESS;
409                 goto out;
410         }
411         fsf_req->data = 0;
412         fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
413         old_req_id = fsf_req->req_id;
414
415         /* don't access old fsf_req after releasing the abort_lock */
416         write_unlock_irqrestore(&adapter->abort_lock, flags);
417
418         fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
419         if (!fsf_req) {
420                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
421                 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
422                                           old_req_id);
423                 retval = FAILED;
424                 goto out;
425         }
426
427         __wait_event(fsf_req->completion_wq,
428                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
429
430         if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
431                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
432                 retval = SUCCESS;
433         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
434                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
435                 retval = SUCCESS;
436         } else {
437                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
438                 retval = FAILED;
439         }
440         zfcp_fsf_req_free(fsf_req);
441  out:
442         return retval;
443 }
444
445 static int
446 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
447 {
448         int retval;
449         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
450
451         if (!unit) {
452                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
453                 retval = SUCCESS;
454                 goto out;
455         }
456         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
457                         unit->fcp_lun, unit->port->wwpn,
458                         zfcp_get_busid_by_adapter(unit->port->adapter));
459
460         /*
461          * If we do not know whether the unit supports 'logical unit reset'
462          * then try 'logical unit reset' and proceed with 'target reset'
463          * if 'logical unit reset' fails.
464          * If the unit is known not to support 'logical unit reset' then
465          * skip 'logical unit reset' and try 'target reset' immediately.
466          */
467         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
468                               &unit->status)) {
469                 retval = zfcp_task_management_function(unit,
470                                                        FCP_LOGICAL_UNIT_RESET,
471                                                        scpnt);
472                 if (retval) {
473                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
474                         if (retval == -ENOTSUPP)
475                                 atomic_set_mask
476                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
477                                      &unit->status);
478                         /* fall through and try 'target reset' next */
479                 } else {
480                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
481                                        unit);
482                         /* avoid 'target reset' */
483                         retval = SUCCESS;
484                         goto out;
485                 }
486         }
487         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
488         if (retval) {
489                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
490                 retval = FAILED;
491         } else {
492                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
493                 retval = SUCCESS;
494         }
495  out:
496         return retval;
497 }
498
499 static int
500 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
501                               struct scsi_cmnd *scpnt)
502 {
503         struct zfcp_adapter *adapter = unit->port->adapter;
504         struct zfcp_fsf_req *fsf_req;
505         int retval = 0;
506
507         /* issue task management function */
508         fsf_req = zfcp_fsf_send_fcp_command_task_management
509                 (adapter, unit, tm_flags, 0);
510         if (!fsf_req) {
511                 ZFCP_LOG_INFO("error: creation of task management request "
512                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
513                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
514                               zfcp_get_busid_by_adapter(adapter));
515                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
516                 retval = -ENOMEM;
517                 goto out;
518         }
519
520         __wait_event(fsf_req->completion_wq,
521                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
522
523         /*
524          * check completion status of task management function
525          */
526         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
527                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
528                 retval = -EIO;
529         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
530                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
531                 retval = -ENOTSUPP;
532         } else
533                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
534
535         zfcp_fsf_req_free(fsf_req);
536  out:
537         return retval;
538 }
539
540 /**
541  * zfcp_scsi_eh_host_reset_handler - handler for host reset
542  */
543 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
544 {
545         struct zfcp_unit *unit;
546         struct zfcp_adapter *adapter;
547
548         unit = (struct zfcp_unit*) scpnt->device->hostdata;
549         adapter = unit->port->adapter;
550
551         ZFCP_LOG_NORMAL("host reset because of problems with "
552                 "unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
553                 unit->fcp_lun, unit->port->wwpn,
554                 zfcp_get_busid_by_adapter(unit->port->adapter));
555
556         zfcp_erp_adapter_reopen(adapter, 0);
557         zfcp_erp_wait(adapter);
558
559         return SUCCESS;
560 }
561
562 int
563 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
564 {
565         int retval = 0;
566         static unsigned int unique_id = 0;
567
568         if (adapter->scsi_host)
569                 goto out;
570
571         /* register adapter as SCSI host with mid layer of SCSI stack */
572         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
573                                              sizeof (struct zfcp_adapter *));
574         if (!adapter->scsi_host) {
575                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
576                                 "for adapter %s ",
577                                 zfcp_get_busid_by_adapter(adapter));
578                 retval = -EIO;
579                 goto out;
580         }
581         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
582
583         /* tell the SCSI stack some characteristics of this adapter */
584         adapter->scsi_host->max_id = 1;
585         adapter->scsi_host->max_lun = 1;
586         adapter->scsi_host->max_channel = 0;
587         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
588         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
589         adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
590
591         /*
592          * save a pointer to our own adapter data structure within
593          * hostdata field of SCSI host data structure
594          */
595         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
596
597         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
598                 scsi_host_put(adapter->scsi_host);
599                 retval = -EIO;
600                 goto out;
601         }
602         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
603  out:
604         return retval;
605 }
606
607 void
608 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
609 {
610         struct Scsi_Host *shost;
611         struct zfcp_port *port;
612
613         shost = adapter->scsi_host;
614         if (!shost)
615                 return;
616         read_lock_irq(&zfcp_data.config_lock);
617         list_for_each_entry(port, &adapter->port_list_head, list)
618                 if (port->rport)
619                         port->rport = NULL;
620         read_unlock_irq(&zfcp_data.config_lock);
621         fc_remove_host(shost);
622         scsi_remove_host(shost);
623         scsi_host_put(shost);
624         adapter->scsi_host = NULL;
625         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
626
627         return;
628 }
629
630 /*
631  * Support functions for FC transport class
632  */
633 static struct fc_host_statistics*
634 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
635 {
636         struct fc_host_statistics *fc_stats;
637
638         if (!adapter->fc_stats) {
639                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
640                 if (!fc_stats)
641                         return NULL;
642                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
643         }
644         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
645         return adapter->fc_stats;
646 }
647
648 static void
649 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
650                           struct fsf_qtcb_bottom_port *data,
651                           struct fsf_qtcb_bottom_port *old)
652 {
653         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
654                 old->seconds_since_last_reset;
655         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
656         fc_stats->tx_words = data->tx_words - old->tx_words;
657         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
658         fc_stats->rx_words = data->rx_words - old->rx_words;
659         fc_stats->lip_count = data->lip - old->lip;
660         fc_stats->nos_count = data->nos - old->nos;
661         fc_stats->error_frames = data->error_frames - old->error_frames;
662         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
663         fc_stats->link_failure_count = data->link_failure - old->link_failure;
664         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
665         fc_stats->loss_of_signal_count = data->loss_of_signal -
666                 old->loss_of_signal;
667         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
668                 old->psp_error_counts;
669         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
670                 old->invalid_tx_words;
671         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
672         fc_stats->fcp_input_requests = data->input_requests -
673                 old->input_requests;
674         fc_stats->fcp_output_requests = data->output_requests -
675                 old->output_requests;
676         fc_stats->fcp_control_requests = data->control_requests -
677                 old->control_requests;
678         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
679         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
680 }
681
682 static void
683 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
684                        struct fsf_qtcb_bottom_port *data)
685 {
686         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
687         fc_stats->tx_frames = data->tx_frames;
688         fc_stats->tx_words = data->tx_words;
689         fc_stats->rx_frames = data->rx_frames;
690         fc_stats->rx_words = data->rx_words;
691         fc_stats->lip_count = data->lip;
692         fc_stats->nos_count = data->nos;
693         fc_stats->error_frames = data->error_frames;
694         fc_stats->dumped_frames = data->dumped_frames;
695         fc_stats->link_failure_count = data->link_failure;
696         fc_stats->loss_of_sync_count = data->loss_of_sync;
697         fc_stats->loss_of_signal_count = data->loss_of_signal;
698         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
699         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
700         fc_stats->invalid_crc_count = data->invalid_crcs;
701         fc_stats->fcp_input_requests = data->input_requests;
702         fc_stats->fcp_output_requests = data->output_requests;
703         fc_stats->fcp_control_requests = data->control_requests;
704         fc_stats->fcp_input_megabytes = data->input_mb;
705         fc_stats->fcp_output_megabytes = data->output_mb;
706 }
707
708 /**
709  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
710  *
711  * assumption: scsi_transport_fc synchronizes calls of
712  *             get_fc_host_stats and reset_fc_host_stats
713  *             (XXX to be checked otherwise introduce locking)
714  */
715 static struct fc_host_statistics *
716 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
717 {
718         struct zfcp_adapter *adapter;
719         struct fc_host_statistics *fc_stats;
720         struct fsf_qtcb_bottom_port *data;
721         int ret;
722
723         adapter = (struct zfcp_adapter *)shost->hostdata[0];
724         fc_stats = zfcp_init_fc_host_stats(adapter);
725         if (!fc_stats)
726                 return NULL;
727
728         data = kzalloc(sizeof(*data), GFP_KERNEL);
729         if (!data)
730                 return NULL;
731
732         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
733         if (ret) {
734                 kfree(data);
735                 return NULL; /* XXX return zeroed fc_stats? */
736         }
737
738         if (adapter->stats_reset &&
739             ((jiffies/HZ - adapter->stats_reset) <
740              data->seconds_since_last_reset)) {
741                 zfcp_adjust_fc_host_stats(fc_stats, data,
742                                           adapter->stats_reset_data);
743         } else
744                 zfcp_set_fc_host_stats(fc_stats, data);
745
746         kfree(data);
747         return fc_stats;
748 }
749
750 static void
751 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
752 {
753         struct zfcp_adapter *adapter;
754         struct fsf_qtcb_bottom_port *data, *old_data;
755         int ret;
756
757         adapter = (struct zfcp_adapter *)shost->hostdata[0];
758         data = kzalloc(sizeof(*data), GFP_KERNEL);
759         if (!data)
760                 return;
761
762         ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
763         if (ret) {
764                 kfree(data);
765         } else {
766                 adapter->stats_reset = jiffies/HZ;
767                 old_data = adapter->stats_reset_data;
768                 adapter->stats_reset_data = data; /* finally freed in
769                                                      adater_dequeue */
770                 kfree(old_data);
771         }
772 }
773
774 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
775 {
776         rport->dev_loss_tmo = timeout;
777 }
778
779 struct fc_function_template zfcp_transport_functions = {
780         .show_starget_port_id = 1,
781         .show_starget_port_name = 1,
782         .show_starget_node_name = 1,
783         .show_rport_supported_classes = 1,
784         .show_rport_maxframe_size = 1,
785         .show_rport_dev_loss_tmo = 1,
786         .show_host_node_name = 1,
787         .show_host_port_name = 1,
788         .show_host_permanent_port_name = 1,
789         .show_host_supported_classes = 1,
790         .show_host_supported_speeds = 1,
791         .show_host_maxframe_size = 1,
792         .show_host_serial_number = 1,
793         .get_fc_host_stats = zfcp_get_fc_host_stats,
794         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
795         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
796         /* no functions registered for following dynamic attributes but
797            directly set by LLDD */
798         .show_host_port_type = 1,
799         .show_host_speed = 1,
800         .show_host_port_id = 1,
801         .disable_target_scan = 1,
802 };
803
804 /**
805  * ZFCP_DEFINE_SCSI_ATTR
806  * @_name:   name of show attribute
807  * @_format: format string
808  * @_value:  value to print
809  *
810  * Generates attribute for a unit.
811  */
812 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
813 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
814                                               char *buf)                 \
815 {                                                                        \
816         struct scsi_device *sdev;                                        \
817         struct zfcp_unit *unit;                                          \
818                                                                          \
819         sdev = to_scsi_device(dev);                                      \
820         unit = sdev->hostdata;                                           \
821         return sprintf(buf, _format, _value);                            \
822 }                                                                        \
823                                                                          \
824 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
825
826 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
827 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
828 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
829
830 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
831         &dev_attr_fcp_lun,
832         &dev_attr_wwpn,
833         &dev_attr_hba_id,
834         NULL
835 };
836
837 #undef ZFCP_LOG_AREA