blob: 46e14f22ec18fd004b2af2aece837cdba54e73e8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Andreas Herrmann4a9d2d82006-05-22 18:14:08 +02002 * This file is part of the zfcp device driver for
3 * FCP adapters for IBM System z9 and zSeries.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Andreas Herrmann4a9d2d82006-05-22 18:14:08 +02005 * (C) Copyright IBM Corp. 2002, 2006
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "zfcp_ext.h"
25
26static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
27static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
28static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
29static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
30 void (*done) (struct scsi_cmnd *));
31static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
32static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
33static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
34static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
Maxim Shchetynin8a36e452005-09-13 21:50:38 +020035static int zfcp_task_management_function(struct zfcp_unit *, u8,
36 struct scsi_cmnd *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Andreas Herrmann06506d02006-05-22 18:18:19 +020038static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
39 unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41static struct device_attribute *zfcp_sysfs_sdev_attrs[];
42
43struct scsi_transport_template *zfcp_transport_template;
44
45struct zfcp_data zfcp_data = {
46 .scsi_host_template = {
47 name: ZFCP_NAME,
48 proc_name: "zfcp",
49 proc_info: NULL,
50 detect: NULL,
51 slave_alloc: zfcp_scsi_slave_alloc,
52 slave_configure: zfcp_scsi_slave_configure,
53 slave_destroy: zfcp_scsi_slave_destroy,
54 queuecommand: zfcp_scsi_queuecommand,
55 eh_abort_handler: zfcp_scsi_eh_abort_handler,
56 eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
57 eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler,
58 eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler,
59 /* FIXME(openfcp): Tune */
60 can_queue: 4096,
Andreas Herrmann35dc25852006-03-02 21:28:54 +010061 this_id: -1,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 /*
63 * FIXME:
64 * one less? can zfcp_create_sbale cope with it?
65 */
66 sg_tablesize: ZFCP_MAX_SBALES_PER_REQ,
67 cmd_per_lun: 1,
68 unchecked_isa_dma: 0,
69 use_clustering: 1,
70 sdev_attrs: zfcp_sysfs_sdev_attrs,
71 },
72 .driver_version = ZFCP_VERSION,
73 /* rest initialised with zeros */
74};
75
76/* Find start of Response Information in FCP response unit*/
77char *
78zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
79{
80 char *fcp_rsp_info_ptr;
81
82 fcp_rsp_info_ptr =
83 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
84
85 return fcp_rsp_info_ptr;
86}
87
88/* Find start of Sense Information in FCP response unit*/
89char *
90zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
91{
92 char *fcp_sns_info_ptr;
93
94 fcp_sns_info_ptr =
95 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
96 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
97 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
98 fcp_rsp_iu->fcp_rsp_len;
99
100 return fcp_sns_info_ptr;
101}
102
103fcp_dl_t *
104zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
105{
106 int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
107 fcp_dl_t *fcp_dl_addr;
108
109 fcp_dl_addr = (fcp_dl_t *)
110 ((unsigned char *) fcp_cmd +
111 sizeof (struct fcp_cmnd_iu) + additional_length);
112 /*
113 * fcp_dl_addr = start address of fcp_cmnd structure +
114 * size of fixed part + size of dynamically sized add_dcp_cdb field
115 * SEE FCP-2 documentation
116 */
117 return fcp_dl_addr;
118}
119
120fcp_dl_t
121zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
122{
123 return *zfcp_get_fcp_dl_ptr(fcp_cmd);
124}
125
126void
127zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
128{
129 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
130}
131
132/*
133 * note: it's a bit-or operation not an assignment
134 * regarding the specified byte
135 */
136static inline void
137set_byte(u32 * result, char status, char pos)
138{
139 *result |= status << (pos * 8);
140}
141
142void
143set_host_byte(u32 * result, char status)
144{
145 set_byte(result, status, 2);
146}
147
148void
149set_driver_byte(u32 * result, char status)
150{
151 set_byte(result, status, 3);
152}
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154static int
155zfcp_scsi_slave_alloc(struct scsi_device *sdp)
156{
157 struct zfcp_adapter *adapter;
158 struct zfcp_unit *unit;
159 unsigned long flags;
Andreas Herrmannfb121b02005-12-01 02:49:29 +0100160 int retval = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
163 if (!adapter)
164 goto out;
165
166 read_lock_irqsave(&zfcp_data.config_lock, flags);
167 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
Andreas Herrmannad58f7d2006-03-10 00:56:16 +0100168 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
169 &unit->status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 sdp->hostdata = unit;
171 unit->device = sdp;
172 zfcp_unit_get(unit);
173 retval = 0;
174 }
175 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
176 out:
177 return retval;
178}
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180static void
181zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
182{
183 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
184
185 if (unit) {
Andreas Herrmannad58f7d2006-03-10 00:56:16 +0100186 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 sdpnt->hostdata = NULL;
188 unit->device = NULL;
189 zfcp_unit_put(unit);
190 } else {
191 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
192 "address %p\n", sdpnt);
193 }
194}
195
196/*
197 * called from scsi midlayer to allow finetuning of a device.
198 */
199static int
200zfcp_scsi_slave_configure(struct scsi_device *sdp)
201{
202 if (sdp->tagged_supported)
203 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
204 else
205 scsi_adjust_queue_depth(sdp, 0, 1);
206 return 0;
207}
208
209/**
210 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
211 * @scpnt: pointer to struct scsi_cmnd where result is set
212 * @result: result to be set in scpnt (e.g. DID_ERROR)
213 */
214static void
215zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
216{
217 set_host_byte(&scpnt->result, result);
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200218 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
219 zfcp_scsi_dbf_event_result("fail", 4,
220 (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100221 scpnt, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 /* return directly */
223 scpnt->scsi_done(scpnt);
224}
225
226/**
227 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
228 * zfcp_scsi_command_sync
229 * @adapter: adapter where scsi command is issued
230 * @unit: unit to which scsi command is sent
231 * @scpnt: scsi command to be sent
232 * @timer: timer to be started if request is successfully initiated
233 *
234 * Note: In scsi_done function must be set in scpnt.
235 */
236int
237zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
238 struct scsi_cmnd *scpnt, struct timer_list *timer)
239{
240 int tmp;
241 int retval;
242
243 retval = 0;
244
245 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
246 BUG_ON(scpnt->scsi_done == NULL);
247
248 if (unlikely(NULL == unit)) {
249 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
250 goto out;
251 }
252
253 if (unlikely(
254 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
255 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
256 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
257 "0x%016Lx on adapter %s\n",
258 unit->fcp_lun, unit->port->wwpn,
259 zfcp_get_busid_by_adapter(adapter));
260 zfcp_scsi_command_fail(scpnt, DID_ERROR);
261 goto out;
262 }
263
264 if (unlikely(
265 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
266 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
267 "on port 0x%016Lx in recovery\n",
268 zfcp_get_busid_by_unit(unit),
269 unit->fcp_lun, unit->port->wwpn);
Andreas Herrmannad58f7d2006-03-10 00:56:16 +0100270 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 goto out;
272 }
273
274 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
275 ZFCP_REQ_AUTO_CLEANUP);
276
277 if (unlikely(tmp < 0)) {
278 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
279 retval = SCSI_MLQUEUE_HOST_BUSY;
280 }
281
282out:
283 return retval;
284}
285
286void
287zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
288{
289 struct completion *wait = (struct completion *) scpnt->SCp.ptr;
290 complete(wait);
291}
292
293
294/**
295 * zfcp_scsi_command_sync - send a SCSI command and wait for completion
296 * @unit: unit where command is sent to
297 * @scpnt: scsi command to be sent
298 * @timer: timer to be started if request is successfully initiated
299 * Return: 0
300 *
301 * Errors are indicated in scpnt->result
302 */
303int
304zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
305 struct timer_list *timer)
306{
307 int ret;
308 DECLARE_COMPLETION(wait);
309
310 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */
311 scpnt->scsi_done = zfcp_scsi_command_sync_handler;
312 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
313 if (ret == 0)
314 wait_for_completion(&wait);
315
316 scpnt->SCp.ptr = NULL;
317
318 return 0;
319}
320
321/*
322 * function: zfcp_scsi_queuecommand
323 *
324 * purpose: enqueues a SCSI command to the specified target device
325 *
326 * returns: 0 - success, SCSI command enqueued
327 * !0 - failure
328 */
329int
330zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
331 void (*done) (struct scsi_cmnd *))
332{
333 struct zfcp_unit *unit;
334 struct zfcp_adapter *adapter;
335
336 /* reset the status for this request */
337 scpnt->result = 0;
338 scpnt->host_scribble = NULL;
339 scpnt->scsi_done = done;
340
341 /*
342 * figure out adapter and target device
343 * (stored there by zfcp_scsi_slave_alloc)
344 */
345 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
346 unit = (struct zfcp_unit *) scpnt->device->hostdata;
347
348 return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
349}
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351static struct zfcp_unit *
Andreas Herrmann06506d02006-05-22 18:18:19 +0200352zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
353 unsigned int lun)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
355 struct zfcp_port *port;
356 struct zfcp_unit *unit, *retval = NULL;
357
358 list_for_each_entry(port, &adapter->port_list_head, list) {
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700359 if (!port->rport || (id != port->rport->scsi_target_id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 continue;
361 list_for_each_entry(unit, &port->unit_list_head, list) {
362 if (lun == unit->scsi_lun) {
363 retval = unit;
364 goto out;
365 }
366 }
367 }
368 out:
369 return retval;
370}
371
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200372/**
373 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
374 * @scpnt: pointer to scsi_cmnd to be aborted
375 * Return: SUCCESS - command has been aborted and cleaned up in internal
376 * bookkeeping, SCSI stack won't be called for aborted command
377 * FAILED - otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 *
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200379 * We do not need to care for a SCSI command which completes normally
380 * but late during this abort routine runs. We are allowed to return
381 * late commands to the SCSI stack. It tracks the state of commands and
382 * will handle late commands. (Usually, the normal completion of late
383 * commands is ignored with respect to the running abort operation.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 */
385int
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200386zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200388 struct Scsi_Host *scsi_host;
389 struct zfcp_adapter *adapter;
390 struct zfcp_unit *unit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 int retval = SUCCESS;
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200392 struct zfcp_fsf_req *new_fsf_req = NULL;
393 struct zfcp_fsf_req *old_fsf_req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200396 scsi_host = scpnt->device->host;
397 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
398 unit = (struct zfcp_unit *) scpnt->device->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
401 scpnt, zfcp_get_busid_by_adapter(adapter));
402
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200403 /* avoid race condition between late normal completion and abort */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 write_lock_irqsave(&adapter->abort_lock, flags);
405
406 /*
407 * Check whether command has just completed and can not be aborted.
408 * Even if the command has just been completed late, we can access
409 * scpnt since the SCSI stack does not release it at least until
410 * this routine returns. (scpnt is parameter passed to this routine
411 * and must not disappear during abort even on late completion.)
412 */
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200413 old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 if (!old_fsf_req) {
415 write_unlock_irqrestore(&adapter->abort_lock, flags);
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100416 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL);
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200417 retval = SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 goto out;
419 }
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200420 old_fsf_req->data = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200423 /* don't access old_fsf_req after releasing the abort_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 write_unlock_irqrestore(&adapter->abort_lock, flags);
425 /* call FSF routine which does the abort */
426 new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
427 adapter, unit, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 if (!new_fsf_req) {
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200429 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100430 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
431 old_fsf_req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 retval = FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 goto out;
434 }
435
436 /* wait for completion of abort */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 __wait_event(new_fsf_req->completion_wq,
438 new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 /* status should be valid since signals were not permitted */
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200441 if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100442 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req,
443 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 retval = SUCCESS;
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200445 } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100446 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req,
447 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 retval = SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 } else {
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100450 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req,
451 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 retval = FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 }
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200454 zfcp_fsf_req_free(new_fsf_req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return retval;
457}
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459int
460zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
461{
462 int retval;
463 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 if (!unit) {
466 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
467 retval = SUCCESS;
468 goto out;
469 }
470 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
471
472 /*
473 * If we do not know whether the unit supports 'logical unit reset'
474 * then try 'logical unit reset' and proceed with 'target reset'
475 * if 'logical unit reset' fails.
476 * If the unit is known not to support 'logical unit reset' then
477 * skip 'logical unit reset' and try 'target reset' immediately.
478 */
479 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
480 &unit->status)) {
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200481 retval = zfcp_task_management_function(unit,
482 FCP_LOGICAL_UNIT_RESET,
483 scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (retval) {
485 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
486 if (retval == -ENOTSUPP)
487 atomic_set_mask
488 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
489 &unit->status);
490 /* fall through and try 'target reset' next */
491 } else {
492 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
493 unit);
494 /* avoid 'target reset' */
495 retval = SUCCESS;
496 goto out;
497 }
498 }
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200499 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (retval) {
501 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
502 retval = FAILED;
503 } else {
504 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
505 retval = SUCCESS;
506 }
507 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 return retval;
509}
510
511static int
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200512zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
513 struct scsi_cmnd *scpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
515 struct zfcp_adapter *adapter = unit->port->adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 struct zfcp_fsf_req *fsf_req;
Andreas Herrmann77eb1692005-09-13 21:48:33 +0200517 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 /* issue task management function */
520 fsf_req = zfcp_fsf_send_fcp_command_task_management
521 (adapter, unit, tm_flags, 0);
522 if (!fsf_req) {
523 ZFCP_LOG_INFO("error: creation of task management request "
524 "failed for unit 0x%016Lx on port 0x%016Lx on "
525 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
526 zfcp_get_busid_by_adapter(adapter));
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200527 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 retval = -ENOMEM;
529 goto out;
530 }
531
Andreas Herrmann77eb1692005-09-13 21:48:33 +0200532 __wait_event(fsf_req->completion_wq,
533 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
534
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200535 /*
536 * check completion status of task management function
537 */
538 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
539 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 retval = -EIO;
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200541 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
542 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 retval = -ENOTSUPP;
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200544 } else
545 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
Andreas Herrmann77eb1692005-09-13 21:48:33 +0200546
547 zfcp_fsf_req_free(fsf_req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 out:
549 return retval;
550}
551
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200552/**
553 * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 */
555int
556zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
557{
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200558 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
559 struct zfcp_adapter *adapter = unit->port->adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 ZFCP_LOG_NORMAL("bus reset because of problems with "
562 "unit 0x%016Lx\n", unit->fcp_lun);
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200563 zfcp_erp_adapter_reopen(adapter, 0);
564 zfcp_erp_wait(adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200566 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200569/**
570 * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 */
572int
573zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
574{
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200575 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
576 struct zfcp_adapter *adapter = unit->port->adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 ZFCP_LOG_NORMAL("host reset because of problems with "
579 "unit 0x%016Lx\n", unit->fcp_lun);
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200580 zfcp_erp_adapter_reopen(adapter, 0);
581 zfcp_erp_wait(adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200583 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584}
585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586int
587zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
588{
589 int retval = 0;
590 static unsigned int unique_id = 0;
591
592 /* register adapter as SCSI host with mid layer of SCSI stack */
593 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
594 sizeof (struct zfcp_adapter *));
595 if (!adapter->scsi_host) {
596 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
597 "for adapter %s ",
598 zfcp_get_busid_by_adapter(adapter));
599 retval = -EIO;
600 goto out;
601 }
602 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
603
604 /* tell the SCSI stack some characteristics of this adapter */
605 adapter->scsi_host->max_id = 1;
606 adapter->scsi_host->max_lun = 1;
607 adapter->scsi_host->max_channel = 0;
608 adapter->scsi_host->unique_id = unique_id++; /* FIXME */
609 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
610 adapter->scsi_host->transportt = zfcp_transport_template;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 /*
613 * save a pointer to our own adapter data structure within
614 * hostdata field of SCSI host data structure
615 */
616 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
617
618 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
619 scsi_host_put(adapter->scsi_host);
620 retval = -EIO;
621 goto out;
622 }
623 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
624 out:
625 return retval;
626}
627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628void
629zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
630{
631 struct Scsi_Host *shost;
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200632 struct zfcp_port *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 shost = adapter->scsi_host;
635 if (!shost)
636 return;
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200637 read_lock_irq(&zfcp_data.config_lock);
638 list_for_each_entry(port, &adapter->port_list_head, list)
639 if (port->rport)
640 port->rport = NULL;
641 read_unlock_irq(&zfcp_data.config_lock);
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700642 fc_remove_host(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 scsi_remove_host(shost);
644 scsi_host_put(shost);
645 adapter->scsi_host = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
647
648 return;
649}
650
651
652void
653zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
654{
655 adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
656 adapter->scsi_er_timer.data = (unsigned long) adapter;
657 adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
658 add_timer(&adapter->scsi_er_timer);
659}
660
661/*
662 * Support functions for FC transport class
663 */
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100664static struct fc_host_statistics*
665zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666{
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100667 struct fc_host_statistics *fc_stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100669 if (!adapter->fc_stats) {
670 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
671 if (!fc_stats)
672 return NULL;
673 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
674 }
675 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
676 return adapter->fc_stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677}
678
679static void
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100680zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
681 struct fsf_qtcb_bottom_port *data,
682 struct fsf_qtcb_bottom_port *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683{
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100684 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
685 old->seconds_since_last_reset;
686 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
687 fc_stats->tx_words = data->tx_words - old->tx_words;
688 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
689 fc_stats->rx_words = data->rx_words - old->rx_words;
690 fc_stats->lip_count = data->lip - old->lip;
691 fc_stats->nos_count = data->nos - old->nos;
692 fc_stats->error_frames = data->error_frames - old->error_frames;
693 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
694 fc_stats->link_failure_count = data->link_failure - old->link_failure;
695 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
696 fc_stats->loss_of_signal_count = data->loss_of_signal -
697 old->loss_of_signal;
698 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
699 old->psp_error_counts;
700 fc_stats->invalid_tx_word_count = data->invalid_tx_words -
701 old->invalid_tx_words;
702 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
703 fc_stats->fcp_input_requests = data->input_requests -
704 old->input_requests;
705 fc_stats->fcp_output_requests = data->output_requests -
706 old->output_requests;
707 fc_stats->fcp_control_requests = data->control_requests -
708 old->control_requests;
709 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
710 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711}
712
713static void
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100714zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
715 struct fsf_qtcb_bottom_port *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100717 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
718 fc_stats->tx_frames = data->tx_frames;
719 fc_stats->tx_words = data->tx_words;
720 fc_stats->rx_frames = data->rx_frames;
721 fc_stats->rx_words = data->rx_words;
722 fc_stats->lip_count = data->lip;
723 fc_stats->nos_count = data->nos;
724 fc_stats->error_frames = data->error_frames;
725 fc_stats->dumped_frames = data->dumped_frames;
726 fc_stats->link_failure_count = data->link_failure;
727 fc_stats->loss_of_sync_count = data->loss_of_sync;
728 fc_stats->loss_of_signal_count = data->loss_of_signal;
729 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
730 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
731 fc_stats->invalid_crc_count = data->invalid_crcs;
732 fc_stats->fcp_input_requests = data->input_requests;
733 fc_stats->fcp_output_requests = data->output_requests;
734 fc_stats->fcp_control_requests = data->control_requests;
735 fc_stats->fcp_input_megabytes = data->input_mb;
736 fc_stats->fcp_output_megabytes = data->output_mb;
737}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100739/**
740 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
741 *
742 * assumption: scsi_transport_fc synchronizes calls of
743 * get_fc_host_stats and reset_fc_host_stats
744 * (XXX to be checked otherwise introduce locking)
745 */
746static struct fc_host_statistics *
747zfcp_get_fc_host_stats(struct Scsi_Host *shost)
748{
749 struct zfcp_adapter *adapter;
750 struct fc_host_statistics *fc_stats;
751 struct fsf_qtcb_bottom_port *data;
752 int ret;
753
754 adapter = (struct zfcp_adapter *)shost->hostdata[0];
755 fc_stats = zfcp_init_fc_host_stats(adapter);
756 if (!fc_stats)
757 return NULL;
758
Andreas Herrmannec4081c2006-05-22 18:17:30 +0200759 data = kzalloc(sizeof(*data), GFP_KERNEL);
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100760 if (!data)
761 return NULL;
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100762
763 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
764 if (ret) {
765 kfree(data);
766 return NULL; /* XXX return zeroed fc_stats? */
767 }
768
769 if (adapter->stats_reset &&
770 ((jiffies/HZ - adapter->stats_reset) <
771 data->seconds_since_last_reset)) {
772 zfcp_adjust_fc_host_stats(fc_stats, data,
773 adapter->stats_reset_data);
774 } else
775 zfcp_set_fc_host_stats(fc_stats, data);
776
777 kfree(data);
778 return fc_stats;
779}
780
781static void
782zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
783{
784 struct zfcp_adapter *adapter;
785 struct fsf_qtcb_bottom_port *data, *old_data;
786 int ret;
787
788 adapter = (struct zfcp_adapter *)shost->hostdata[0];
Andreas Herrmannec4081c2006-05-22 18:17:30 +0200789 data = kzalloc(sizeof(*data), GFP_KERNEL);
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100790 if (!data)
791 return;
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100792
793 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
794 if (ret == 0) {
795 adapter->stats_reset = jiffies/HZ;
796 old_data = adapter->stats_reset_data;
797 adapter->stats_reset_data = data; /* finally freed in
798 adater_dequeue */
799 kfree(old_data);
800 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801}
802
Andreas Herrmann338151e2006-05-22 18:25:56 +0200803static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
804{
805 rport->dev_loss_tmo = timeout;
806}
807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808struct fc_function_template zfcp_transport_functions = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 .show_starget_port_id = 1,
810 .show_starget_port_name = 1,
811 .show_starget_node_name = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700812 .show_rport_supported_classes = 1,
Ralph Wuerthner75bfc282006-05-22 18:24:33 +0200813 .show_rport_maxframe_size = 1,
Andreas Herrmann338151e2006-05-22 18:25:56 +0200814 .show_rport_dev_loss_tmo = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700815 .show_host_node_name = 1,
816 .show_host_port_name = 1,
Andreas Herrmannad757cd2006-01-13 02:26:11 +0100817 .show_host_permanent_port_name = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700818 .show_host_supported_classes = 1,
Andreas Herrmannad757cd2006-01-13 02:26:11 +0100819 .show_host_supported_speeds = 1,
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200820 .show_host_maxframe_size = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700821 .show_host_serial_number = 1,
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100822 .get_fc_host_stats = zfcp_get_fc_host_stats,
823 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
Andreas Herrmann338151e2006-05-22 18:25:56 +0200824 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100825 /* no functions registered for following dynamic attributes but
826 directly set by LLDD */
Andreas Herrmannad757cd2006-01-13 02:26:11 +0100827 .show_host_port_type = 1,
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200828 .show_host_speed = 1,
829 .show_host_port_id = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830};
831
832/**
833 * ZFCP_DEFINE_SCSI_ATTR
834 * @_name: name of show attribute
835 * @_format: format string
836 * @_value: value to print
837 *
838 * Generates attribute for a unit.
839 */
840#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
Yani Ioannou10523b32005-05-17 06:43:37 -0400841static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 char *buf) \
843{ \
844 struct scsi_device *sdev; \
845 struct zfcp_unit *unit; \
846 \
847 sdev = to_scsi_device(dev); \
848 unit = sdev->hostdata; \
849 return sprintf(buf, _format, _value); \
850} \
851 \
852static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
853
854ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
855ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
856ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
857
858static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
859 &dev_attr_fcp_lun,
860 &dev_attr_wwpn,
861 &dev_attr_hba_id,
862 NULL
863};
864
865#undef ZFCP_LOG_AREA