aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/scsi/zfcp_scsi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/s390/scsi/zfcp_scsi.c')
-rw-r--r--drivers/s390/scsi/zfcp_scsi.c949
1 files changed, 949 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
new file mode 100644
index 000000000000..e21b547fd427
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -0,0 +1,949 @@
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
38static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
39static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
40static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
41static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
42 void (*done) (struct scsi_cmnd *));
43static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
44static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
45static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
46static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
47static int zfcp_task_management_function(struct zfcp_unit *, u8);
48
49static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
50 scsi_lun_t);
51static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int,
52 scsi_id_t);
53
54static struct device_attribute *zfcp_sysfs_sdev_attrs[];
55
56struct scsi_transport_template *zfcp_transport_template;
57
58struct zfcp_data zfcp_data = {
59 .scsi_host_template = {
60 name: ZFCP_NAME,
61 proc_name: "zfcp",
62 proc_info: NULL,
63 detect: NULL,
64 slave_alloc: zfcp_scsi_slave_alloc,
65 slave_configure: zfcp_scsi_slave_configure,
66 slave_destroy: zfcp_scsi_slave_destroy,
67 queuecommand: zfcp_scsi_queuecommand,
68 eh_abort_handler: zfcp_scsi_eh_abort_handler,
69 eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
70 eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler,
71 eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler,
72 /* FIXME(openfcp): Tune */
73 can_queue: 4096,
74 this_id: 0,
75 /*
76 * FIXME:
77 * one less? can zfcp_create_sbale cope with it?
78 */
79 sg_tablesize: ZFCP_MAX_SBALES_PER_REQ,
80 cmd_per_lun: 1,
81 unchecked_isa_dma: 0,
82 use_clustering: 1,
83 sdev_attrs: zfcp_sysfs_sdev_attrs,
84 },
85 .driver_version = ZFCP_VERSION,
86 /* rest initialised with zeros */
87};
88
89/* Find start of Response Information in FCP response unit*/
90char *
91zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
92{
93 char *fcp_rsp_info_ptr;
94
95 fcp_rsp_info_ptr =
96 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
97
98 return fcp_rsp_info_ptr;
99}
100
101/* Find start of Sense Information in FCP response unit*/
102char *
103zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
104{
105 char *fcp_sns_info_ptr;
106
107 fcp_sns_info_ptr =
108 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
109 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
110 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
111 fcp_rsp_iu->fcp_rsp_len;
112
113 return fcp_sns_info_ptr;
114}
115
116fcp_dl_t *
117zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
118{
119 int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
120 fcp_dl_t *fcp_dl_addr;
121
122 fcp_dl_addr = (fcp_dl_t *)
123 ((unsigned char *) fcp_cmd +
124 sizeof (struct fcp_cmnd_iu) + additional_length);
125 /*
126 * fcp_dl_addr = start address of fcp_cmnd structure +
127 * size of fixed part + size of dynamically sized add_dcp_cdb field
128 * SEE FCP-2 documentation
129 */
130 return fcp_dl_addr;
131}
132
133fcp_dl_t
134zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
135{
136 return *zfcp_get_fcp_dl_ptr(fcp_cmd);
137}
138
139void
140zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
141{
142 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
143}
144
145/*
146 * note: it's a bit-or operation not an assignment
147 * regarding the specified byte
148 */
149static inline void
150set_byte(u32 * result, char status, char pos)
151{
152 *result |= status << (pos * 8);
153}
154
155void
156set_host_byte(u32 * result, char status)
157{
158 set_byte(result, status, 2);
159}
160
161void
162set_driver_byte(u32 * result, char status)
163{
164 set_byte(result, status, 3);
165}
166
167/*
168 * function: zfcp_scsi_slave_alloc
169 *
170 * purpose:
171 *
172 * returns:
173 */
174
175static int
176zfcp_scsi_slave_alloc(struct scsi_device *sdp)
177{
178 struct zfcp_adapter *adapter;
179 struct zfcp_unit *unit;
180 unsigned long flags;
181 int retval = -ENODEV;
182
183 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
184 if (!adapter)
185 goto out;
186
187 read_lock_irqsave(&zfcp_data.config_lock, flags);
188 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
189 if (unit) {
190 sdp->hostdata = unit;
191 unit->device = sdp;
192 zfcp_unit_get(unit);
193 retval = 0;
194 }
195 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
196 out:
197 return retval;
198}
199
200/*
201 * function: zfcp_scsi_slave_destroy
202 *
203 * purpose:
204 *
205 * returns:
206 */
207
208static void
209zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
210{
211 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
212
213 if (unit) {
214 sdpnt->hostdata = NULL;
215 unit->device = NULL;
216 zfcp_unit_put(unit);
217 } else {
218 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
219 "address %p\n", sdpnt);
220 }
221}
222
223/*
224 * called from scsi midlayer to allow finetuning of a device.
225 */
226static int
227zfcp_scsi_slave_configure(struct scsi_device *sdp)
228{
229 if (sdp->tagged_supported)
230 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
231 else
232 scsi_adjust_queue_depth(sdp, 0, 1);
233 return 0;
234}
235
236/**
237 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
238 * @scpnt: pointer to struct scsi_cmnd where result is set
239 * @result: result to be set in scpnt (e.g. DID_ERROR)
240 */
241static void
242zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
243{
244 set_host_byte(&scpnt->result, result);
245 zfcp_cmd_dbf_event_scsi("failing", scpnt);
246 /* return directly */
247 scpnt->scsi_done(scpnt);
248}
249
250/**
251 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
252 * zfcp_scsi_command_sync
253 * @adapter: adapter where scsi command is issued
254 * @unit: unit to which scsi command is sent
255 * @scpnt: scsi command to be sent
256 * @timer: timer to be started if request is successfully initiated
257 *
258 * Note: In scsi_done function must be set in scpnt.
259 */
260int
261zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
262 struct scsi_cmnd *scpnt, struct timer_list *timer)
263{
264 int tmp;
265 int retval;
266
267 retval = 0;
268
269 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
270 BUG_ON(scpnt->scsi_done == NULL);
271
272 if (unlikely(NULL == unit)) {
273 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
274 goto out;
275 }
276
277 if (unlikely(
278 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
279 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
280 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
281 "0x%016Lx on adapter %s\n",
282 unit->fcp_lun, unit->port->wwpn,
283 zfcp_get_busid_by_adapter(adapter));
284 zfcp_scsi_command_fail(scpnt, DID_ERROR);
285 goto out;
286 }
287
288 if (unlikely(
289 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
290 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
291 "on port 0x%016Lx in recovery\n",
292 zfcp_get_busid_by_unit(unit),
293 unit->fcp_lun, unit->port->wwpn);
294 retval = SCSI_MLQUEUE_DEVICE_BUSY;
295 goto out;
296 }
297
298 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
299 ZFCP_REQ_AUTO_CLEANUP);
300
301 if (unlikely(tmp < 0)) {
302 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
303 retval = SCSI_MLQUEUE_HOST_BUSY;
304 }
305
306out:
307 return retval;
308}
309
310void
311zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
312{
313 struct completion *wait = (struct completion *) scpnt->SCp.ptr;
314 complete(wait);
315}
316
317
318/**
319 * zfcp_scsi_command_sync - send a SCSI command and wait for completion
320 * @unit: unit where command is sent to
321 * @scpnt: scsi command to be sent
322 * @timer: timer to be started if request is successfully initiated
323 * Return: 0
324 *
325 * Errors are indicated in scpnt->result
326 */
327int
328zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
329 struct timer_list *timer)
330{
331 int ret;
332 DECLARE_COMPLETION(wait);
333
334 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */
335 scpnt->scsi_done = zfcp_scsi_command_sync_handler;
336 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
337 if (ret == 0)
338 wait_for_completion(&wait);
339
340 scpnt->SCp.ptr = NULL;
341
342 return 0;
343}
344
345/*
346 * function: zfcp_scsi_queuecommand
347 *
348 * purpose: enqueues a SCSI command to the specified target device
349 *
350 * returns: 0 - success, SCSI command enqueued
351 * !0 - failure
352 */
353int
354zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
355 void (*done) (struct scsi_cmnd *))
356{
357 struct zfcp_unit *unit;
358 struct zfcp_adapter *adapter;
359
360 /* reset the status for this request */
361 scpnt->result = 0;
362 scpnt->host_scribble = NULL;
363 scpnt->scsi_done = done;
364
365 /*
366 * figure out adapter and target device
367 * (stored there by zfcp_scsi_slave_alloc)
368 */
369 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
370 unit = (struct zfcp_unit *) scpnt->device->hostdata;
371
372 return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
373}
374
375/*
376 * function: zfcp_unit_lookup
377 *
378 * purpose:
379 *
380 * returns:
381 *
382 * context:
383 */
384static struct zfcp_unit *
385zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
386 scsi_lun_t lun)
387{
388 struct zfcp_port *port;
389 struct zfcp_unit *unit, *retval = NULL;
390
391 list_for_each_entry(port, &adapter->port_list_head, list) {
392 if (id != port->scsi_id)
393 continue;
394 list_for_each_entry(unit, &port->unit_list_head, list) {
395 if (lun == unit->scsi_lun) {
396 retval = unit;
397 goto out;
398 }
399 }
400 }
401 out:
402 return retval;
403}
404
405static struct zfcp_port *
406zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id)
407{
408 struct zfcp_port *port;
409
410 list_for_each_entry(port, &adapter->port_list_head, list) {
411 if (id == port->scsi_id)
412 return port;
413 }
414 return (struct zfcp_port *) NULL;
415}
416
417/*
418 * function: zfcp_scsi_eh_abort_handler
419 *
420 * purpose: tries to abort the specified (timed out) SCSI command
421 *
422 * note: We do not need to care for a SCSI command which completes
423 * normally but late during this abort routine runs.
424 * We are allowed to return late commands to the SCSI stack.
425 * It tracks the state of commands and will handle late commands.
426 * (Usually, the normal completion of late commands is ignored with
427 * respect to the running abort operation. Grep for 'done_late'
428 * in the SCSI stacks sources.)
429 *
430 * returns: SUCCESS - command has been aborted and cleaned up in internal
431 * bookkeeping,
432 * SCSI stack won't be called for aborted command
433 * FAILED - otherwise
434 */
435int
436zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
437{
438 int retval = SUCCESS;
439 struct zfcp_fsf_req *new_fsf_req, *old_fsf_req;
440 struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
441 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
442 struct zfcp_port *port = unit->port;
443 struct Scsi_Host *scsi_host = scpnt->device->host;
444 union zfcp_req_data *req_data = NULL;
445 unsigned long flags;
446 u32 status = 0;
447
448 /* the components of a abort_dbf record (fixed size record) */
449 u64 dbf_scsi_cmnd = (unsigned long) scpnt;
450 char dbf_opcode[ZFCP_ABORT_DBF_LENGTH];
451 wwn_t dbf_wwn = port->wwpn;
452 fcp_lun_t dbf_fcp_lun = unit->fcp_lun;
453 u64 dbf_retries = scpnt->retries;
454 u64 dbf_allowed = scpnt->allowed;
455 u64 dbf_timeout = 0;
456 u64 dbf_fsf_req = 0;
457 u64 dbf_fsf_status = 0;
458 u64 dbf_fsf_qual[2] = { 0, 0 };
459 char dbf_result[ZFCP_ABORT_DBF_LENGTH] = "##undef";
460
461 memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH);
462 memcpy(dbf_opcode,
463 scpnt->cmnd,
464 min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH));
465
466 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
467 scpnt, zfcp_get_busid_by_adapter(adapter));
468
469 spin_unlock_irq(scsi_host->host_lock);
470
471 /*
472 * Race condition between normal (late) completion and abort has
473 * to be avoided.
474 * The entirity of all accesses to scsi_req have to be atomic.
475 * scsi_req is usually part of the fsf_req and thus we block the
476 * release of fsf_req as long as we need to access scsi_req.
477 */
478 write_lock_irqsave(&adapter->abort_lock, flags);
479
480 /*
481 * Check whether command has just completed and can not be aborted.
482 * Even if the command has just been completed late, we can access
483 * scpnt since the SCSI stack does not release it at least until
484 * this routine returns. (scpnt is parameter passed to this routine
485 * and must not disappear during abort even on late completion.)
486 */
487 req_data = (union zfcp_req_data *) scpnt->host_scribble;
488 /* DEBUG */
489 ZFCP_LOG_DEBUG("req_data=%p\n", req_data);
490 if (!req_data) {
491 ZFCP_LOG_DEBUG("late command completion overtook abort\n");
492 /*
493 * That's it.
494 * Do not initiate abort but return SUCCESS.
495 */
496 write_unlock_irqrestore(&adapter->abort_lock, flags);
497 retval = SUCCESS;
498 strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH);
499 goto out;
500 }
501
502 /* Figure out which fsf_req needs to be aborted. */
503 old_fsf_req = req_data->send_fcp_command_task.fsf_req;
504
505 dbf_fsf_req = (unsigned long) old_fsf_req;
506 dbf_timeout =
507 (jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ;
508
509 ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req);
510 if (!old_fsf_req) {
511 write_unlock_irqrestore(&adapter->abort_lock, flags);
512 ZFCP_LOG_NORMAL("bug: no old fsf request found\n");
513 ZFCP_LOG_NORMAL("req_data:\n");
514 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
515 (char *) req_data, sizeof (union zfcp_req_data));
516 ZFCP_LOG_NORMAL("scsi_cmnd:\n");
517 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL,
518 (char *) scpnt, sizeof (struct scsi_cmnd));
519 retval = FAILED;
520 strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH);
521 goto out;
522 }
523 old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL;
524 /* mark old request as being aborted */
525 old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
526 /*
527 * We have to collect all information (e.g. unit) needed by
528 * zfcp_fsf_abort_fcp_command before calling that routine
529 * since that routine is not allowed to access
530 * fsf_req which it is going to abort.
531 * This is because of we need to release fsf_req_list_lock
532 * before calling zfcp_fsf_abort_fcp_command.
533 * Since this lock will not be held, fsf_req may complete
534 * late and may be released meanwhile.
535 */
536 ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit);
537
538 /*
539 * We block (call schedule)
540 * That's why we must release the lock and enable the
541 * interrupts before.
542 * On the other hand we do not need the lock anymore since
543 * all critical accesses to scsi_req are done.
544 */
545 write_unlock_irqrestore(&adapter->abort_lock, flags);
546 /* call FSF routine which does the abort */
547 new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
548 adapter, unit, 0);
549 ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req);
550 if (!new_fsf_req) {
551 retval = FAILED;
552 ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd "
553 "failed\n");
554 strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH);
555 goto out;
556 }
557
558 /* wait for completion of abort */
559 ZFCP_LOG_DEBUG("waiting for cleanup...\n");
560#if 1
561 /*
562 * FIXME:
563 * copying zfcp_fsf_req_wait_and_cleanup code is not really nice
564 */
565 __wait_event(new_fsf_req->completion_wq,
566 new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
567 status = new_fsf_req->status;
568 dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status;
569 /*
570 * Ralphs special debug load provides timestamps in the FSF
571 * status qualifier. This might be specified later if being
572 * useful for debugging aborts.
573 */
574 dbf_fsf_qual[0] =
575 *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0];
576 dbf_fsf_qual[1] =
577 *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2];
578 zfcp_fsf_req_cleanup(new_fsf_req);
579#else
580 retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req,
581 ZFCP_UNINTERRUPTIBLE, &status);
582#endif
583 ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status);
584 /* status should be valid since signals were not permitted */
585 if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
586 retval = SUCCESS;
587 strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH);
588 } else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
589 retval = SUCCESS;
590 strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH);
591 } else {
592 retval = FAILED;
593 strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH);
594 }
595
596 out:
597 debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64));
598 debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH);
599 debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t));
600 debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t));
601 debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64));
602 debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64));
603 debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64));
604 debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64));
605 debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64));
606 debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64));
607 debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64));
608 debug_text_event(adapter->abort_dbf, 1, dbf_result);
609
610 spin_lock_irq(scsi_host->host_lock);
611 return retval;
612}
613
614/*
615 * function: zfcp_scsi_eh_device_reset_handler
616 *
617 * purpose:
618 *
619 * returns:
620 */
621int
622zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
623{
624 int retval;
625 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
626 struct Scsi_Host *scsi_host = scpnt->device->host;
627
628 spin_unlock_irq(scsi_host->host_lock);
629
630 if (!unit) {
631 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
632 retval = SUCCESS;
633 goto out;
634 }
635 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
636
637 /*
638 * If we do not know whether the unit supports 'logical unit reset'
639 * then try 'logical unit reset' and proceed with 'target reset'
640 * if 'logical unit reset' fails.
641 * If the unit is known not to support 'logical unit reset' then
642 * skip 'logical unit reset' and try 'target reset' immediately.
643 */
644 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
645 &unit->status)) {
646 retval =
647 zfcp_task_management_function(unit, FCP_LOGICAL_UNIT_RESET);
648 if (retval) {
649 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
650 if (retval == -ENOTSUPP)
651 atomic_set_mask
652 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
653 &unit->status);
654 /* fall through and try 'target reset' next */
655 } else {
656 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
657 unit);
658 /* avoid 'target reset' */
659 retval = SUCCESS;
660 goto out;
661 }
662 }
663 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET);
664 if (retval) {
665 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
666 retval = FAILED;
667 } else {
668 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
669 retval = SUCCESS;
670 }
671 out:
672 spin_lock_irq(scsi_host->host_lock);
673 return retval;
674}
675
676static int
677zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags)
678{
679 struct zfcp_adapter *adapter = unit->port->adapter;
680 int retval;
681 int status;
682 struct zfcp_fsf_req *fsf_req;
683
684 /* issue task management function */
685 fsf_req = zfcp_fsf_send_fcp_command_task_management
686 (adapter, unit, tm_flags, 0);
687 if (!fsf_req) {
688 ZFCP_LOG_INFO("error: creation of task management request "
689 "failed for unit 0x%016Lx on port 0x%016Lx on "
690 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
691 zfcp_get_busid_by_adapter(adapter));
692 retval = -ENOMEM;
693 goto out;
694 }
695
696 retval = zfcp_fsf_req_wait_and_cleanup(fsf_req,
697 ZFCP_UNINTERRUPTIBLE, &status);
698 /*
699 * check completion status of task management function
700 * (status should always be valid since no signals permitted)
701 */
702 if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED)
703 retval = -EIO;
704 else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP)
705 retval = -ENOTSUPP;
706 else
707 retval = 0;
708 out:
709 return retval;
710}
711
712/*
713 * function: zfcp_scsi_eh_bus_reset_handler
714 *
715 * purpose:
716 *
717 * returns:
718 */
719int
720zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
721{
722 int retval = 0;
723 struct zfcp_unit *unit;
724 struct Scsi_Host *scsi_host = scpnt->device->host;
725
726 spin_unlock_irq(scsi_host->host_lock);
727
728 unit = (struct zfcp_unit *) scpnt->device->hostdata;
729 ZFCP_LOG_NORMAL("bus reset because of problems with "
730 "unit 0x%016Lx\n", unit->fcp_lun);
731 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
732 zfcp_erp_wait(unit->port->adapter);
733 retval = SUCCESS;
734
735 spin_lock_irq(scsi_host->host_lock);
736 return retval;
737}
738
739/*
740 * function: zfcp_scsi_eh_host_reset_handler
741 *
742 * purpose:
743 *
744 * returns:
745 */
746int
747zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
748{
749 int retval = 0;
750 struct zfcp_unit *unit;
751 struct Scsi_Host *scsi_host = scpnt->device->host;
752
753 spin_unlock_irq(scsi_host->host_lock);
754
755 unit = (struct zfcp_unit *) scpnt->device->hostdata;
756 ZFCP_LOG_NORMAL("host reset because of problems with "
757 "unit 0x%016Lx\n", unit->fcp_lun);
758 zfcp_erp_adapter_reopen(unit->port->adapter, 0);
759 zfcp_erp_wait(unit->port->adapter);
760 retval = SUCCESS;
761
762 spin_lock_irq(scsi_host->host_lock);
763 return retval;
764}
765
766/*
767 * function:
768 *
769 * purpose:
770 *
771 * returns:
772 */
773int
774zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
775{
776 int retval = 0;
777 static unsigned int unique_id = 0;
778
779 /* register adapter as SCSI host with mid layer of SCSI stack */
780 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
781 sizeof (struct zfcp_adapter *));
782 if (!adapter->scsi_host) {
783 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
784 "for adapter %s ",
785 zfcp_get_busid_by_adapter(adapter));
786 retval = -EIO;
787 goto out;
788 }
789 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
790
791 /* tell the SCSI stack some characteristics of this adapter */
792 adapter->scsi_host->max_id = 1;
793 adapter->scsi_host->max_lun = 1;
794 adapter->scsi_host->max_channel = 0;
795 adapter->scsi_host->unique_id = unique_id++; /* FIXME */
796 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
797 adapter->scsi_host->transportt = zfcp_transport_template;
798 /*
799 * Reverse mapping of the host number to avoid race condition
800 */
801 adapter->scsi_host_no = adapter->scsi_host->host_no;
802
803 /*
804 * save a pointer to our own adapter data structure within
805 * hostdata field of SCSI host data structure
806 */
807 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
808
809 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
810 scsi_host_put(adapter->scsi_host);
811 retval = -EIO;
812 goto out;
813 }
814 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
815 out:
816 return retval;
817}
818
819/*
820 * function:
821 *
822 * purpose:
823 *
824 * returns:
825 */
826void
827zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
828{
829 struct Scsi_Host *shost;
830
831 shost = adapter->scsi_host;
832 if (!shost)
833 return;
834 scsi_remove_host(shost);
835 scsi_host_put(shost);
836 adapter->scsi_host = NULL;
837 adapter->scsi_host_no = 0;
838 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
839
840 return;
841}
842
843
844void
845zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
846{
847 adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
848 adapter->scsi_er_timer.data = (unsigned long) adapter;
849 adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
850 add_timer(&adapter->scsi_er_timer);
851}
852
853/*
854 * Support functions for FC transport class
855 */
856static void
857zfcp_get_port_id(struct scsi_target *starget)
858{
859 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
860 struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
861 struct zfcp_port *port;
862 unsigned long flags;
863
864 read_lock_irqsave(&zfcp_data.config_lock, flags);
865 port = zfcp_port_lookup(adapter, starget->channel, starget->id);
866 if (port)
867 fc_starget_port_id(starget) = port->d_id;
868 else
869 fc_starget_port_id(starget) = -1;
870 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
871}
872
873static void
874zfcp_get_port_name(struct scsi_target *starget)
875{
876 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
877 struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
878 struct zfcp_port *port;
879 unsigned long flags;
880
881 read_lock_irqsave(&zfcp_data.config_lock, flags);
882 port = zfcp_port_lookup(adapter, starget->channel, starget->id);
883 if (port)
884 fc_starget_port_name(starget) = port->wwpn;
885 else
886 fc_starget_port_name(starget) = -1;
887 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
888}
889
890static void
891zfcp_get_node_name(struct scsi_target *starget)
892{
893 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
894 struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0];
895 struct zfcp_port *port;
896 unsigned long flags;
897
898 read_lock_irqsave(&zfcp_data.config_lock, flags);
899 port = zfcp_port_lookup(adapter, starget->channel, starget->id);
900 if (port)
901 fc_starget_node_name(starget) = port->wwnn;
902 else
903 fc_starget_node_name(starget) = -1;
904 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
905}
906
907struct fc_function_template zfcp_transport_functions = {
908 .get_starget_port_id = zfcp_get_port_id,
909 .get_starget_port_name = zfcp_get_port_name,
910 .get_starget_node_name = zfcp_get_node_name,
911 .show_starget_port_id = 1,
912 .show_starget_port_name = 1,
913 .show_starget_node_name = 1,
914};
915
916/**
917 * ZFCP_DEFINE_SCSI_ATTR
918 * @_name: name of show attribute
919 * @_format: format string
920 * @_value: value to print
921 *
922 * Generates attribute for a unit.
923 */
924#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
925static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, \
926 char *buf) \
927{ \
928 struct scsi_device *sdev; \
929 struct zfcp_unit *unit; \
930 \
931 sdev = to_scsi_device(dev); \
932 unit = sdev->hostdata; \
933 return sprintf(buf, _format, _value); \
934} \
935 \
936static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
937
938ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
939ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
940ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
941
942static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
943 &dev_attr_fcp_lun,
944 &dev_attr_wwpn,
945 &dev_attr_hba_id,
946 NULL
947};
948
949#undef ZFCP_LOG_AREA
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 07:18:27 -0500