Merge master.kernel.org:/home/rmk/linux-2.6-mmc
[pandora-kernel.git] / drivers / s390 / scsi / zfcp_scsi.c
1 /* 
2  * 
3  * linux/drivers/s390/scsi/zfcp_scsi.c
4  * 
5  * FCP adapter driver for IBM eServer zSeries 
6  * 
7  * (C) Copyright IBM Corp. 2002, 2004
8  *
9  * Author(s): Martin Peschke <mpeschke@de.ibm.com> 
10  *            Raimund Schroeder <raimund.schroeder@de.ibm.com> 
11  *            Aron Zeh
12  *            Wolfgang Taphorn
13  *            Stefan Bader <stefan.bader@de.ibm.com> 
14  *            Heiko Carstens <heiko.carstens@de.ibm.com> 
15  *            Andreas Herrmann <aherrman@de.ibm.com>
16  * 
17  * This program is free software; you can redistribute it and/or modify 
18  * it under the terms of the GNU General Public License as published by 
19  * the Free Software Foundation; either version 2, or (at your option) 
20  * any later version. 
21  * 
22  * This program is distributed in the hope that it will be useful, 
23  * but WITHOUT ANY WARRANTY; without even the implied warranty of 
24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
25  * GNU General Public License for more details. 
26  * 
27  * You should have received a copy of the GNU General Public License 
28  * along with this program; if not, write to the Free Software 
29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
30  */
31
32 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_SCSI
33
34 #define ZFCP_SCSI_REVISION "$Revision: 1.74 $"
35
36 #include "zfcp_ext.h"
37
38 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
39 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
40 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
41 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
42                                   void (*done) (struct scsi_cmnd *));
43 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
44 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
45 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
46 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
47 static int zfcp_task_management_function(struct zfcp_unit *, u8,
48                                          struct scsi_cmnd *);
49
50 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
51                                           scsi_lun_t);
52
53 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
54
55 struct scsi_transport_template *zfcp_transport_template;
56
57 struct zfcp_data zfcp_data = {
58         .scsi_host_template = {
59               name:                    ZFCP_NAME,
60               proc_name:               "zfcp",
61               proc_info:               NULL,
62               detect:                  NULL,
63               slave_alloc:             zfcp_scsi_slave_alloc,
64               slave_configure:         zfcp_scsi_slave_configure,
65               slave_destroy:           zfcp_scsi_slave_destroy,
66               queuecommand:            zfcp_scsi_queuecommand,
67               eh_abort_handler:        zfcp_scsi_eh_abort_handler,
68               eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
69               eh_bus_reset_handler:    zfcp_scsi_eh_bus_reset_handler,
70               eh_host_reset_handler:   zfcp_scsi_eh_host_reset_handler,
71                                        /* FIXME(openfcp): Tune */
72               can_queue:               4096,
73               this_id:                 0,
74               /*
75                * FIXME:
76                * one less? can zfcp_create_sbale cope with it?
77                */
78               sg_tablesize:            ZFCP_MAX_SBALES_PER_REQ,
79               cmd_per_lun:             1,
80               unchecked_isa_dma:       0,
81               use_clustering:          1,
82               sdev_attrs:              zfcp_sysfs_sdev_attrs,
83         },
84         .driver_version = ZFCP_VERSION,
85         /* rest initialised with zeros */
86 };
87
88 /* Find start of Response Information in FCP response unit*/
89 char *
90 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
91 {
92         char *fcp_rsp_info_ptr;
93
94         fcp_rsp_info_ptr =
95             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
96
97         return fcp_rsp_info_ptr;
98 }
99
100 /* Find start of Sense Information in FCP response unit*/
101 char *
102 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
103 {
104         char *fcp_sns_info_ptr;
105
106         fcp_sns_info_ptr =
107             (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
108         if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
109                 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
110                     fcp_rsp_iu->fcp_rsp_len;
111
112         return fcp_sns_info_ptr;
113 }
114
115 fcp_dl_t *
116 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
117 {
118         int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
119         fcp_dl_t *fcp_dl_addr;
120
121         fcp_dl_addr = (fcp_dl_t *)
122                 ((unsigned char *) fcp_cmd +
123                  sizeof (struct fcp_cmnd_iu) + additional_length);
124         /*
125          * fcp_dl_addr = start address of fcp_cmnd structure + 
126          * size of fixed part + size of dynamically sized add_dcp_cdb field
127          * SEE FCP-2 documentation
128          */
129         return fcp_dl_addr;
130 }
131
132 fcp_dl_t
133 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
134 {
135         return *zfcp_get_fcp_dl_ptr(fcp_cmd);
136 }
137
138 void
139 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
140 {
141         *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
142 }
143
144 /*
145  * note: it's a bit-or operation not an assignment
146  * regarding the specified byte
147  */
148 static inline void
149 set_byte(u32 * result, char status, char pos)
150 {
151         *result |= status << (pos * 8);
152 }
153
154 void
155 set_host_byte(u32 * result, char status)
156 {
157         set_byte(result, status, 2);
158 }
159
160 void
161 set_driver_byte(u32 * result, char status)
162 {
163         set_byte(result, status, 3);
164 }
165
166 /*
167  * function:    zfcp_scsi_slave_alloc
168  *
169  * purpose:
170  *
171  * returns:
172  */
173
174 static int
175 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
176 {
177         struct zfcp_adapter *adapter;
178         struct zfcp_unit *unit;
179         unsigned long flags;
180         int retval = -ENXIO;
181
182         adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
183         if (!adapter)
184                 goto out;
185
186         read_lock_irqsave(&zfcp_data.config_lock, flags);
187         unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
188         if (unit) {
189                 sdp->hostdata = unit;
190                 unit->device = sdp;
191                 zfcp_unit_get(unit);
192                 retval = 0;
193         }
194         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
195  out:
196         return retval;
197 }
198
199 /*
200  * function:    zfcp_scsi_slave_destroy
201  *
202  * purpose:
203  *
204  * returns:
205  */
206
207 static void
208 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
209 {
210         struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
211
212         if (unit) {
213                 sdpnt->hostdata = NULL;
214                 unit->device = NULL;
215                 zfcp_unit_put(unit);
216         } else {
217                 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
218                                 "address %p\n", sdpnt);
219         }
220 }
221
222 /* 
223  * called from scsi midlayer to allow finetuning of a device.
224  */
225 static int
226 zfcp_scsi_slave_configure(struct scsi_device *sdp)
227 {
228         if (sdp->tagged_supported)
229                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
230         else
231                 scsi_adjust_queue_depth(sdp, 0, 1);
232         return 0;
233 }
234
235 /**
236  * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
237  * @scpnt: pointer to struct scsi_cmnd where result is set
238  * @result: result to be set in scpnt (e.g. DID_ERROR)
239  */
240 static void
241 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
242 {
243         set_host_byte(&scpnt->result, result);
244         if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
245                 zfcp_scsi_dbf_event_result("fail", 4,
246                         (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
247                         scpnt);
248         /* return directly */
249         scpnt->scsi_done(scpnt);
250 }
251
252 /**
253  * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
254  *      zfcp_scsi_command_sync
255  * @adapter: adapter where scsi command is issued
256  * @unit: unit to which scsi command is sent
257  * @scpnt: scsi command to be sent
258  * @timer: timer to be started if request is successfully initiated
259  *
260  * Note: In scsi_done function must be set in scpnt.
261  */
262 int
263 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
264                         struct scsi_cmnd *scpnt, struct timer_list *timer)
265 {
266         int tmp;
267         int retval;
268
269         retval = 0;
270
271         BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
272         BUG_ON(scpnt->scsi_done == NULL);
273
274         if (unlikely(NULL == unit)) {
275                 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
276                 goto out;
277         }
278
279         if (unlikely(
280               atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
281              !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
282                 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
283                                "0x%016Lx on adapter %s\n",
284                                unit->fcp_lun, unit->port->wwpn,
285                                zfcp_get_busid_by_adapter(adapter));
286                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
287                 goto out;
288         }
289
290         if (unlikely(
291              !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
292                 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
293                                "on port 0x%016Lx in recovery\n",
294                                zfcp_get_busid_by_unit(unit),
295                                unit->fcp_lun, unit->port->wwpn);
296                 retval = SCSI_MLQUEUE_DEVICE_BUSY;
297                 goto out;
298         }
299
300         tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
301                                              ZFCP_REQ_AUTO_CLEANUP);
302
303         if (unlikely(tmp < 0)) {
304                 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
305                 retval = SCSI_MLQUEUE_HOST_BUSY;
306         }
307
308 out:
309         return retval;
310 }
311
312 void
313 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
314 {
315         struct completion *wait = (struct completion *) scpnt->SCp.ptr;
316         complete(wait);
317 }
318
319
320 /**
321  * zfcp_scsi_command_sync - send a SCSI command and wait for completion
322  * @unit: unit where command is sent to
323  * @scpnt: scsi command to be sent
324  * @timer: timer to be started if request is successfully initiated
325  * Return: 0
326  *
327  * Errors are indicated in scpnt->result
328  */
329 int
330 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
331                        struct timer_list *timer)
332 {
333         int ret;
334         DECLARE_COMPLETION(wait);
335
336         scpnt->SCp.ptr = (void *) &wait;  /* silent re-use */
337         scpnt->scsi_done = zfcp_scsi_command_sync_handler;
338         ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
339         if (ret == 0)
340                 wait_for_completion(&wait);
341
342         scpnt->SCp.ptr = NULL;
343
344         return 0;
345 }
346
347 /*
348  * function:    zfcp_scsi_queuecommand
349  *
350  * purpose:     enqueues a SCSI command to the specified target device
351  *
352  * returns:     0 - success, SCSI command enqueued
353  *              !0 - failure
354  */
355 int
356 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
357                        void (*done) (struct scsi_cmnd *))
358 {
359         struct zfcp_unit *unit;
360         struct zfcp_adapter *adapter;
361
362         /* reset the status for this request */
363         scpnt->result = 0;
364         scpnt->host_scribble = NULL;
365         scpnt->scsi_done = done;
366
367         /*
368          * figure out adapter and target device
369          * (stored there by zfcp_scsi_slave_alloc)
370          */
371         adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
372         unit = (struct zfcp_unit *) scpnt->device->hostdata;
373
374         return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
375 }
376
377 /*
378  * function:    zfcp_unit_lookup
379  *
380  * purpose:
381  *
382  * returns:
383  *
384  * context:     
385  */
386 static struct zfcp_unit *
387 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
388                  scsi_lun_t lun)
389 {
390         struct zfcp_port *port;
391         struct zfcp_unit *unit, *retval = NULL;
392
393         list_for_each_entry(port, &adapter->port_list_head, list) {
394                 if (!port->rport || (id != port->rport->scsi_target_id))
395                         continue;
396                 list_for_each_entry(unit, &port->unit_list_head, list) {
397                         if (lun == unit->scsi_lun) {
398                                 retval = unit;
399                                 goto out;
400                         }
401                 }
402         }
403  out:
404         return retval;
405 }
406
407 /**
408  * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
409  * @scpnt: pointer to scsi_cmnd to be aborted 
410  * Return: SUCCESS - command has been aborted and cleaned up in internal
411  *          bookkeeping, SCSI stack won't be called for aborted command
412  *         FAILED - otherwise
413  *
414  * We do not need to care for a SCSI command which completes normally
415  * but late during this abort routine runs.  We are allowed to return
416  * late commands to the SCSI stack.  It tracks the state of commands and
417  * will handle late commands.  (Usually, the normal completion of late
418  * commands is ignored with respect to the running abort operation.)
419  */
420 int
421 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
422 {
423         struct Scsi_Host *scsi_host;
424         struct zfcp_adapter *adapter;
425         struct zfcp_unit *unit;
426         int retval = SUCCESS;
427         struct zfcp_fsf_req *new_fsf_req = NULL;
428         struct zfcp_fsf_req *old_fsf_req;
429         unsigned long flags;
430
431         scsi_host = scpnt->device->host;
432         adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
433         unit = (struct zfcp_unit *) scpnt->device->hostdata;
434
435         ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
436                       scpnt, zfcp_get_busid_by_adapter(adapter));
437
438         /* avoid race condition between late normal completion and abort */
439         write_lock_irqsave(&adapter->abort_lock, flags);
440
441         /*
442          * Check whether command has just completed and can not be aborted.
443          * Even if the command has just been completed late, we can access
444          * scpnt since the SCSI stack does not release it at least until
445          * this routine returns. (scpnt is parameter passed to this routine
446          * and must not disappear during abort even on late completion.)
447          */
448         old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
449         if (!old_fsf_req) {
450                 write_unlock_irqrestore(&adapter->abort_lock, flags);
451                 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, new_fsf_req);
452                 retval = SUCCESS;
453                 goto out;
454         }
455         old_fsf_req->data = 0;
456         old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
457
458         /* don't access old_fsf_req after releasing the abort_lock */
459         write_unlock_irqrestore(&adapter->abort_lock, flags);
460         /* call FSF routine which does the abort */
461         new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
462                                                  adapter, unit, 0);
463         if (!new_fsf_req) {
464                 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
465                 retval = FAILED;
466                 goto out;
467         }
468
469         /* wait for completion of abort */
470         __wait_event(new_fsf_req->completion_wq,
471                      new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
472
473         /* status should be valid since signals were not permitted */
474         if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
475                 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req);
476                 retval = SUCCESS;
477         } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
478                 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req);
479                 retval = SUCCESS;
480         } else {
481                 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req);
482                 retval = FAILED;
483         }
484         zfcp_fsf_req_free(new_fsf_req);
485  out:
486         return retval;
487 }
488
489 /*
490  * function:    zfcp_scsi_eh_device_reset_handler
491  *
492  * purpose:
493  *
494  * returns:
495  */
496 int
497 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
498 {
499         int retval;
500         struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
501
502         if (!unit) {
503                 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
504                 retval = SUCCESS;
505                 goto out;
506         }
507         ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
508
509         /*
510          * If we do not know whether the unit supports 'logical unit reset'
511          * then try 'logical unit reset' and proceed with 'target reset'
512          * if 'logical unit reset' fails.
513          * If the unit is known not to support 'logical unit reset' then
514          * skip 'logical unit reset' and try 'target reset' immediately.
515          */
516         if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
517                               &unit->status)) {
518                 retval = zfcp_task_management_function(unit,
519                                                        FCP_LOGICAL_UNIT_RESET,
520                                                        scpnt);
521                 if (retval) {
522                         ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
523                         if (retval == -ENOTSUPP)
524                                 atomic_set_mask
525                                     (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
526                                      &unit->status);
527                         /* fall through and try 'target reset' next */
528                 } else {
529                         ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
530                                        unit);
531                         /* avoid 'target reset' */
532                         retval = SUCCESS;
533                         goto out;
534                 }
535         }
536         retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
537         if (retval) {
538                 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
539                 retval = FAILED;
540         } else {
541                 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
542                 retval = SUCCESS;
543         }
544  out:
545         return retval;
546 }
547
548 static int
549 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
550                               struct scsi_cmnd *scpnt)
551 {
552         struct zfcp_adapter *adapter = unit->port->adapter;
553         struct zfcp_fsf_req *fsf_req;
554         int retval = 0;
555
556         /* issue task management function */
557         fsf_req = zfcp_fsf_send_fcp_command_task_management
558                 (adapter, unit, tm_flags, 0);
559         if (!fsf_req) {
560                 ZFCP_LOG_INFO("error: creation of task management request "
561                               "failed for unit 0x%016Lx on port 0x%016Lx on  "
562                               "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
563                               zfcp_get_busid_by_adapter(adapter));
564                 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
565                 retval = -ENOMEM;
566                 goto out;
567         }
568
569         __wait_event(fsf_req->completion_wq,
570                      fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
571
572         /*
573          * check completion status of task management function
574          */
575         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
576                 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
577                 retval = -EIO;
578         } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
579                 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
580                 retval = -ENOTSUPP;
581         } else
582                 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
583
584         zfcp_fsf_req_free(fsf_req);
585  out:
586         return retval;
587 }
588
589 /**
590  * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
591  */
592 int
593 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
594 {
595         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
596         struct zfcp_adapter *adapter = unit->port->adapter;
597
598         ZFCP_LOG_NORMAL("bus reset because of problems with "
599                         "unit 0x%016Lx\n", unit->fcp_lun);
600         zfcp_erp_adapter_reopen(adapter, 0);
601         zfcp_erp_wait(adapter);
602
603         return SUCCESS;
604 }
605
606 /**
607  * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
608  */
609 int
610 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
611 {
612         struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
613         struct zfcp_adapter *adapter = unit->port->adapter;
614
615         ZFCP_LOG_NORMAL("host reset because of problems with "
616                         "unit 0x%016Lx\n", unit->fcp_lun);
617         zfcp_erp_adapter_reopen(adapter, 0);
618         zfcp_erp_wait(adapter);
619
620         return SUCCESS;
621 }
622
623 /*
624  * function:    
625  *
626  * purpose:     
627  *
628  * returns:
629  */
630 int
631 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
632 {
633         int retval = 0;
634         static unsigned int unique_id = 0;
635
636         /* register adapter as SCSI host with mid layer of SCSI stack */
637         adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
638                                              sizeof (struct zfcp_adapter *));
639         if (!adapter->scsi_host) {
640                 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
641                                 "for adapter %s ",
642                                 zfcp_get_busid_by_adapter(adapter));
643                 retval = -EIO;
644                 goto out;
645         }
646         ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
647
648         /* tell the SCSI stack some characteristics of this adapter */
649         adapter->scsi_host->max_id = 1;
650         adapter->scsi_host->max_lun = 1;
651         adapter->scsi_host->max_channel = 0;
652         adapter->scsi_host->unique_id = unique_id++;    /* FIXME */
653         adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
654         adapter->scsi_host->transportt = zfcp_transport_template;
655         /*
656          * Reverse mapping of the host number to avoid race condition
657          */
658         adapter->scsi_host_no = adapter->scsi_host->host_no;
659
660         /*
661          * save a pointer to our own adapter data structure within
662          * hostdata field of SCSI host data structure
663          */
664         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
665
666         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
667                 scsi_host_put(adapter->scsi_host);
668                 retval = -EIO;
669                 goto out;
670         }
671         atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
672  out:
673         return retval;
674 }
675
676 /*
677  * function:    
678  *
679  * purpose:     
680  *
681  * returns:
682  */
683 void
684 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
685 {
686         struct Scsi_Host *shost;
687         struct zfcp_port *port;
688
689         shost = adapter->scsi_host;
690         if (!shost)
691                 return;
692         read_lock_irq(&zfcp_data.config_lock);
693         list_for_each_entry(port, &adapter->port_list_head, list)
694                 if (port->rport)
695                         port->rport = NULL;
696         read_unlock_irq(&zfcp_data.config_lock);
697         fc_remove_host(shost);
698         scsi_remove_host(shost);
699         scsi_host_put(shost);
700         adapter->scsi_host = NULL;
701         adapter->scsi_host_no = 0;
702         atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
703
704         return;
705 }
706
707
708 void
709 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
710 {
711         adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
712         adapter->scsi_er_timer.data = (unsigned long) adapter;
713         adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
714         add_timer(&adapter->scsi_er_timer);
715 }
716
717 /*
718  * Support functions for FC transport class
719  */
720 static struct fc_host_statistics*
721 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
722 {
723         struct fc_host_statistics *fc_stats;
724
725         if (!adapter->fc_stats) {
726                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
727                 if (!fc_stats)
728                         return NULL;
729                 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
730         }
731         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
732         return adapter->fc_stats;
733 }
734
735 static void
736 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
737                           struct fsf_qtcb_bottom_port *data,
738                           struct fsf_qtcb_bottom_port *old)
739 {
740         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
741                 old->seconds_since_last_reset;
742         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
743         fc_stats->tx_words = data->tx_words - old->tx_words;
744         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
745         fc_stats->rx_words = data->rx_words - old->rx_words;
746         fc_stats->lip_count = data->lip - old->lip;
747         fc_stats->nos_count = data->nos - old->nos;
748         fc_stats->error_frames = data->error_frames - old->error_frames;
749         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
750         fc_stats->link_failure_count = data->link_failure - old->link_failure;
751         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
752         fc_stats->loss_of_signal_count = data->loss_of_signal -
753                 old->loss_of_signal;
754         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
755                 old->psp_error_counts;
756         fc_stats->invalid_tx_word_count = data->invalid_tx_words -
757                 old->invalid_tx_words;
758         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
759         fc_stats->fcp_input_requests = data->input_requests -
760                 old->input_requests;
761         fc_stats->fcp_output_requests = data->output_requests -
762                 old->output_requests;
763         fc_stats->fcp_control_requests = data->control_requests -
764                 old->control_requests;
765         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
766         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
767 }
768
769 static void
770 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
771                        struct fsf_qtcb_bottom_port *data)
772 {
773         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
774         fc_stats->tx_frames = data->tx_frames;
775         fc_stats->tx_words = data->tx_words;
776         fc_stats->rx_frames = data->rx_frames;
777         fc_stats->rx_words = data->rx_words;
778         fc_stats->lip_count = data->lip;
779         fc_stats->nos_count = data->nos;
780         fc_stats->error_frames = data->error_frames;
781         fc_stats->dumped_frames = data->dumped_frames;
782         fc_stats->link_failure_count = data->link_failure;
783         fc_stats->loss_of_sync_count = data->loss_of_sync;
784         fc_stats->loss_of_signal_count = data->loss_of_signal;
785         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
786         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
787         fc_stats->invalid_crc_count = data->invalid_crcs;
788         fc_stats->fcp_input_requests = data->input_requests;
789         fc_stats->fcp_output_requests = data->output_requests;
790         fc_stats->fcp_control_requests = data->control_requests;
791         fc_stats->fcp_input_megabytes = data->input_mb;
792         fc_stats->fcp_output_megabytes = data->output_mb;
793 }
794
795 /**
796  * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
797  *
798  * assumption: scsi_transport_fc synchronizes calls of
799  *             get_fc_host_stats and reset_fc_host_stats
800  *             (XXX to be checked otherwise introduce locking)
801  */
802 static struct fc_host_statistics *
803 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
804 {
805         struct zfcp_adapter *adapter;
806         struct fc_host_statistics *fc_stats;
807         struct fsf_qtcb_bottom_port *data;
808         int ret;
809
810         adapter = (struct zfcp_adapter *)shost->hostdata[0];
811         fc_stats = zfcp_init_fc_host_stats(adapter);
812         if (!fc_stats)
813                 return NULL;
814
815         data = kmalloc(sizeof(*data), GFP_KERNEL);
816         if (!data)
817                 return NULL;
818         memset(data, 0, sizeof(*data));
819
820         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
821         if (ret) {
822                 kfree(data);
823                 return NULL; /* XXX return zeroed fc_stats? */
824         }
825
826         if (adapter->stats_reset &&
827             ((jiffies/HZ - adapter->stats_reset) <
828              data->seconds_since_last_reset)) {
829                 zfcp_adjust_fc_host_stats(fc_stats, data,
830                                           adapter->stats_reset_data);
831         } else
832                 zfcp_set_fc_host_stats(fc_stats, data);
833
834         kfree(data);
835         return fc_stats;
836 }
837
838 static void
839 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
840 {
841         struct zfcp_adapter *adapter;
842         struct fsf_qtcb_bottom_port *data, *old_data;
843         int ret;
844
845         adapter = (struct zfcp_adapter *)shost->hostdata[0];
846         data = kmalloc(sizeof(*data), GFP_KERNEL);
847         if (!data)
848                 return;
849         memset(data, 0, sizeof(*data));
850
851         ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
852         if (ret == 0) {
853                 adapter->stats_reset = jiffies/HZ;
854                 old_data = adapter->stats_reset_data;
855                 adapter->stats_reset_data = data; /* finally freed in
856                                                      adater_dequeue */
857                 kfree(old_data);
858         }
859 }
860
861 struct fc_function_template zfcp_transport_functions = {
862         .show_starget_port_id = 1,
863         .show_starget_port_name = 1,
864         .show_starget_node_name = 1,
865         .show_rport_supported_classes = 1,
866         .show_host_node_name = 1,
867         .show_host_port_name = 1,
868         .show_host_permanent_port_name = 1,
869         .show_host_supported_classes = 1,
870         .show_host_supported_speeds = 1,
871         .show_host_maxframe_size = 1,
872         .show_host_serial_number = 1,
873         .get_fc_host_stats = zfcp_get_fc_host_stats,
874         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
875         /* no functions registered for following dynamic attributes but
876            directly set by LLDD */
877         .show_host_port_type = 1,
878         .show_host_speed = 1,
879         .show_host_port_id = 1,
880 };
881
882 /**
883  * ZFCP_DEFINE_SCSI_ATTR
884  * @_name:   name of show attribute
885  * @_format: format string
886  * @_value:  value to print
887  *
888  * Generates attribute for a unit.
889  */
890 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value)                    \
891 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr,        \
892                                               char *buf)                 \
893 {                                                                        \
894         struct scsi_device *sdev;                                        \
895         struct zfcp_unit *unit;                                          \
896                                                                          \
897         sdev = to_scsi_device(dev);                                      \
898         unit = sdev->hostdata;                                           \
899         return sprintf(buf, _format, _value);                            \
900 }                                                                        \
901                                                                          \
902 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
903
904 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
905 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
906 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
907
908 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
909         &dev_attr_fcp_lun,
910         &dev_attr_wwpn,
911         &dev_attr_hba_id,
912         NULL
913 };
914
915 #undef ZFCP_LOG_AREA