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