blob: 452d96f92a1482a5611a79e5712a2c53f04d31ad [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 *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
Maxim Shchetynin8a36e452005-09-13 21:50:38 +020034static int zfcp_task_management_function(struct zfcp_unit *, u8,
35 struct scsi_cmnd *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Andreas Herrmann06506d02006-05-22 18:18:19 +020037static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
38 unsigned int, unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40static struct device_attribute *zfcp_sysfs_sdev_attrs[];
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042struct zfcp_data zfcp_data = {
43 .scsi_host_template = {
Heiko Carstensd2c993d2006-07-12 16:41:55 +020044 .name = ZFCP_NAME,
Heiko Carstensdd52e0e2006-09-18 22:28:49 +020045 .module = THIS_MODULE,
Heiko Carstensd2c993d2006-07-12 16:41:55 +020046 .proc_name = "zfcp",
Heiko Carstensd2c993d2006-07-12 16:41:55 +020047 .slave_alloc = zfcp_scsi_slave_alloc,
48 .slave_configure = zfcp_scsi_slave_configure,
49 .slave_destroy = zfcp_scsi_slave_destroy,
50 .queuecommand = zfcp_scsi_queuecommand,
51 .eh_abort_handler = zfcp_scsi_eh_abort_handler,
52 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +020053 .eh_bus_reset_handler = zfcp_scsi_eh_host_reset_handler,
Heiko Carstensd2c993d2006-07-12 16:41:55 +020054 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
55 .can_queue = 4096,
56 .this_id = -1,
Heiko Carstensd2c993d2006-07-12 16:41:55 +020057 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
58 .cmd_per_lun = 1,
Heiko Carstensd2c993d2006-07-12 16:41:55 +020059 .use_clustering = 1,
60 .sdev_attrs = zfcp_sysfs_sdev_attrs,
Swen Schillig8d1a0062006-10-12 11:43:44 +020061 .max_sectors = ZFCP_MAX_SECTORS,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 },
63 .driver_version = ZFCP_VERSION,
Linus Torvalds1da177e2005-04-16 15:20:36 -070064};
65
66/* Find start of Response Information in FCP response unit*/
67char *
68zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
69{
70 char *fcp_rsp_info_ptr;
71
72 fcp_rsp_info_ptr =
73 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
74
75 return fcp_rsp_info_ptr;
76}
77
78/* Find start of Sense Information in FCP response unit*/
79char *
80zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
81{
82 char *fcp_sns_info_ptr;
83
84 fcp_sns_info_ptr =
85 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
86 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
87 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
88 fcp_rsp_iu->fcp_rsp_len;
89
90 return fcp_sns_info_ptr;
91}
92
93fcp_dl_t *
94zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
95{
96 int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
97 fcp_dl_t *fcp_dl_addr;
98
99 fcp_dl_addr = (fcp_dl_t *)
100 ((unsigned char *) fcp_cmd +
101 sizeof (struct fcp_cmnd_iu) + additional_length);
102 /*
103 * fcp_dl_addr = start address of fcp_cmnd structure +
104 * size of fixed part + size of dynamically sized add_dcp_cdb field
105 * SEE FCP-2 documentation
106 */
107 return fcp_dl_addr;
108}
109
110fcp_dl_t
111zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
112{
113 return *zfcp_get_fcp_dl_ptr(fcp_cmd);
114}
115
116void
117zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
118{
119 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
120}
121
122/*
123 * note: it's a bit-or operation not an assignment
124 * regarding the specified byte
125 */
126static inline void
127set_byte(u32 * result, char status, char pos)
128{
129 *result |= status << (pos * 8);
130}
131
132void
133set_host_byte(u32 * result, char status)
134{
135 set_byte(result, status, 2);
136}
137
138void
139set_driver_byte(u32 * result, char status)
140{
141 set_byte(result, status, 3);
142}
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144static int
145zfcp_scsi_slave_alloc(struct scsi_device *sdp)
146{
147 struct zfcp_adapter *adapter;
148 struct zfcp_unit *unit;
149 unsigned long flags;
Andreas Herrmannfb121b02005-12-01 02:49:29 +0100150 int retval = -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
153 if (!adapter)
154 goto out;
155
156 read_lock_irqsave(&zfcp_data.config_lock, flags);
157 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
Andreas Herrmannad58f7d2006-03-10 00:56:16 +0100158 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
159 &unit->status)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 sdp->hostdata = unit;
161 unit->device = sdp;
162 zfcp_unit_get(unit);
163 retval = 0;
164 }
165 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
166 out:
167 return retval;
168}
169
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +0200170/**
171 * zfcp_scsi_slave_destroy - called when scsi device is removed
172 *
173 * Remove reference to associated scsi device for an zfcp_unit.
174 * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
175 * or a scan for this device might have failed.
176 */
177static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
179 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
180
181 if (unit) {
Andreas Herrmannad58f7d2006-03-10 00:56:16 +0100182 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 sdpnt->hostdata = NULL;
184 unit->device = NULL;
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +0200185 zfcp_erp_unit_failed(unit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 zfcp_unit_put(unit);
187 } else {
188 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
189 "address %p\n", sdpnt);
190 }
191}
192
193/*
194 * called from scsi midlayer to allow finetuning of a device.
195 */
196static int
197zfcp_scsi_slave_configure(struct scsi_device *sdp)
198{
199 if (sdp->tagged_supported)
200 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
201 else
202 scsi_adjust_queue_depth(sdp, 0, 1);
203 return 0;
204}
205
206/**
207 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
208 * @scpnt: pointer to struct scsi_cmnd where result is set
209 * @result: result to be set in scpnt (e.g. DID_ERROR)
210 */
211static void
212zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
213{
214 set_host_byte(&scpnt->result, result);
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200215 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
216 zfcp_scsi_dbf_event_result("fail", 4,
217 (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100218 scpnt, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 /* return directly */
220 scpnt->scsi_done(scpnt);
221}
222
223/**
224 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
225 * zfcp_scsi_command_sync
226 * @adapter: adapter where scsi command is issued
227 * @unit: unit to which scsi command is sent
228 * @scpnt: scsi command to be sent
229 * @timer: timer to be started if request is successfully initiated
230 *
231 * Note: In scsi_done function must be set in scpnt.
232 */
233int
234zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
Andreas Herrmann2abbe862006-09-18 22:29:56 +0200235 struct scsi_cmnd *scpnt, int use_timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 int tmp;
238 int retval;
239
240 retval = 0;
241
242 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
243 BUG_ON(scpnt->scsi_done == NULL);
244
245 if (unlikely(NULL == unit)) {
246 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
247 goto out;
248 }
249
250 if (unlikely(
251 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
252 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
253 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
254 "0x%016Lx on adapter %s\n",
255 unit->fcp_lun, unit->port->wwpn,
256 zfcp_get_busid_by_adapter(adapter));
257 zfcp_scsi_command_fail(scpnt, DID_ERROR);
258 goto out;
259 }
260
261 if (unlikely(
262 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
263 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
264 "on port 0x%016Lx in recovery\n",
265 zfcp_get_busid_by_unit(unit),
266 unit->fcp_lun, unit->port->wwpn);
Andreas Herrmannad58f7d2006-03-10 00:56:16 +0100267 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 goto out;
269 }
270
Andreas Herrmann2abbe862006-09-18 22:29:56 +0200271 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 ZFCP_REQ_AUTO_CLEANUP);
273
274 if (unlikely(tmp < 0)) {
275 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
276 retval = SCSI_MLQUEUE_HOST_BUSY;
277 }
278
279out:
280 return retval;
281}
282
283void
284zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
285{
286 struct completion *wait = (struct completion *) scpnt->SCp.ptr;
287 complete(wait);
288}
289
290
291/**
292 * zfcp_scsi_command_sync - send a SCSI command and wait for completion
293 * @unit: unit where command is sent to
294 * @scpnt: scsi command to be sent
Andreas Herrmann2abbe862006-09-18 22:29:56 +0200295 * @use_timer: indicates whether timer should be setup or not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 * Return: 0
297 *
298 * Errors are indicated in scpnt->result
299 */
300int
301zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
Andreas Herrmann2abbe862006-09-18 22:29:56 +0200302 int use_timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 int ret;
Peter Zijlstra6e9a4732006-09-30 23:28:10 -0700305 DECLARE_COMPLETION_ONSTACK(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */
308 scpnt->scsi_done = zfcp_scsi_command_sync_handler;
Andreas Herrmann2abbe862006-09-18 22:29:56 +0200309 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
310 use_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (ret == 0)
312 wait_for_completion(&wait);
313
314 scpnt->SCp.ptr = NULL;
315
316 return 0;
317}
318
319/*
320 * function: zfcp_scsi_queuecommand
321 *
322 * purpose: enqueues a SCSI command to the specified target device
323 *
324 * returns: 0 - success, SCSI command enqueued
325 * !0 - failure
326 */
327int
328zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
329 void (*done) (struct scsi_cmnd *))
330{
331 struct zfcp_unit *unit;
332 struct zfcp_adapter *adapter;
333
334 /* reset the status for this request */
335 scpnt->result = 0;
336 scpnt->host_scribble = NULL;
337 scpnt->scsi_done = done;
338
339 /*
340 * figure out adapter and target device
341 * (stored there by zfcp_scsi_slave_alloc)
342 */
343 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
344 unit = (struct zfcp_unit *) scpnt->device->hostdata;
345
Andreas Herrmann2abbe862006-09-18 22:29:56 +0200346 return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347}
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349static struct zfcp_unit *
Andreas Herrmann06506d02006-05-22 18:18:19 +0200350zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
351 unsigned int lun)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
353 struct zfcp_port *port;
354 struct zfcp_unit *unit, *retval = NULL;
355
356 list_for_each_entry(port, &adapter->port_list_head, list) {
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700357 if (!port->rport || (id != port->rport->scsi_target_id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 continue;
359 list_for_each_entry(unit, &port->unit_list_head, list) {
360 if (lun == unit->scsi_lun) {
361 retval = unit;
362 goto out;
363 }
364 }
365 }
366 out:
367 return retval;
368}
369
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200370/**
371 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
372 * @scpnt: pointer to scsi_cmnd to be aborted
373 * Return: SUCCESS - command has been aborted and cleaned up in internal
374 * bookkeeping, SCSI stack won't be called for aborted command
375 * FAILED - otherwise
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 *
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200377 * We do not need to care for a SCSI command which completes normally
378 * but late during this abort routine runs. We are allowed to return
379 * late commands to the SCSI stack. It tracks the state of commands and
380 * will handle late commands. (Usually, the normal completion of late
381 * commands is ignored with respect to the running abort operation.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 */
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200383int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200385 struct Scsi_Host *scsi_host;
386 struct zfcp_adapter *adapter;
387 struct zfcp_unit *unit;
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200388 struct zfcp_fsf_req *fsf_req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 unsigned long flags;
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200390 unsigned long old_req_id;
391 int retval = SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200393 scsi_host = scpnt->device->host;
394 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
395 unit = (struct zfcp_unit *) scpnt->device->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
397 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
398 scpnt, zfcp_get_busid_by_adapter(adapter));
399
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200400 /* avoid race condition between late normal completion and abort */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 write_lock_irqsave(&adapter->abort_lock, flags);
402
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200403 /* Check whether corresponding fsf_req is still pending */
404 spin_lock(&adapter->req_list_lock);
405 fsf_req = zfcp_reqlist_ismember(adapter, (unsigned long)
406 scpnt->host_scribble);
407 spin_unlock(&adapter->req_list_lock);
408 if (!fsf_req) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 write_unlock_irqrestore(&adapter->abort_lock, flags);
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200410 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200411 retval = SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 goto out;
413 }
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200414 fsf_req->data = 0;
415 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
416 old_req_id = fsf_req->req_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200418 /* don't access old fsf_req after releasing the abort_lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 write_unlock_irqrestore(&adapter->abort_lock, flags);
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200420
421 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
422 if (!fsf_req) {
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200423 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
Maxim Shchetynined829ad2006-02-11 01:42:58 +0100424 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200425 old_req_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 retval = FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 goto out;
428 }
429
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200430 __wait_event(fsf_req->completion_wq,
431 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
Andreas Herrmann059c97d2005-09-13 21:47:52 +0200432
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200433 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
434 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 retval = SUCCESS;
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200436 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
437 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 retval = SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 } else {
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200440 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 retval = FAILED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 }
Andreas Herrmann4eff4a32006-09-18 22:29:20 +0200443 zfcp_fsf_req_free(fsf_req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 return retval;
446}
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448int
449zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
450{
451 int retval;
452 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (!unit) {
455 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
456 retval = SUCCESS;
457 goto out;
458 }
459 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
460
461 /*
462 * If we do not know whether the unit supports 'logical unit reset'
463 * then try 'logical unit reset' and proceed with 'target reset'
464 * if 'logical unit reset' fails.
465 * If the unit is known not to support 'logical unit reset' then
466 * skip 'logical unit reset' and try 'target reset' immediately.
467 */
468 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
469 &unit->status)) {
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200470 retval = zfcp_task_management_function(unit,
471 FCP_LOGICAL_UNIT_RESET,
472 scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 if (retval) {
474 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
475 if (retval == -ENOTSUPP)
476 atomic_set_mask
477 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
478 &unit->status);
479 /* fall through and try 'target reset' next */
480 } else {
481 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
482 unit);
483 /* avoid 'target reset' */
484 retval = SUCCESS;
485 goto out;
486 }
487 }
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200488 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 if (retval) {
490 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
491 retval = FAILED;
492 } else {
493 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
494 retval = SUCCESS;
495 }
496 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return retval;
498}
499
500static int
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200501zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
502 struct scsi_cmnd *scpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503{
504 struct zfcp_adapter *adapter = unit->port->adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 struct zfcp_fsf_req *fsf_req;
Andreas Herrmann77eb1692005-09-13 21:48:33 +0200506 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508 /* issue task management function */
509 fsf_req = zfcp_fsf_send_fcp_command_task_management
510 (adapter, unit, tm_flags, 0);
511 if (!fsf_req) {
512 ZFCP_LOG_INFO("error: creation of task management request "
513 "failed for unit 0x%016Lx on port 0x%016Lx on "
514 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
515 zfcp_get_busid_by_adapter(adapter));
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200516 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 retval = -ENOMEM;
518 goto out;
519 }
520
Andreas Herrmann77eb1692005-09-13 21:48:33 +0200521 __wait_event(fsf_req->completion_wq,
522 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
523
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200524 /*
525 * check completion status of task management function
526 */
527 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
528 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 retval = -EIO;
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200530 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
531 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 retval = -ENOTSUPP;
Maxim Shchetynin8a36e452005-09-13 21:50:38 +0200533 } else
534 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
Andreas Herrmann77eb1692005-09-13 21:48:33 +0200535
536 zfcp_fsf_req_free(fsf_req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 out:
538 return retval;
539}
540
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200541/**
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +0200542 * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 */
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +0200544int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545{
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +0200546 struct zfcp_unit *unit;
547 struct zfcp_adapter *adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Andreas Herrmannf6c0e7a2006-08-02 11:05:52 +0200549 unit = (struct zfcp_unit*) scpnt->device->hostdata;
550 adapter = unit->port->adapter;
551
552 ZFCP_LOG_NORMAL("host/bus reset because of problems with "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 "unit 0x%016Lx\n", unit->fcp_lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Andreas Herrmann81654282006-09-18 22:30:36 +0200555 zfcp_erp_adapter_reopen(adapter, 0);
556 zfcp_erp_wait(adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Andreas Herrmann810f1e3e2005-09-13 21:49:52 +0200558 return SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559}
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561int
562zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
563{
564 int retval = 0;
565 static unsigned int unique_id = 0;
566
567 /* register adapter as SCSI host with mid layer of SCSI stack */
568 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
569 sizeof (struct zfcp_adapter *));
570 if (!adapter->scsi_host) {
571 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
572 "for adapter %s ",
573 zfcp_get_busid_by_adapter(adapter));
574 retval = -EIO;
575 goto out;
576 }
577 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
578
579 /* tell the SCSI stack some characteristics of this adapter */
580 adapter->scsi_host->max_id = 1;
581 adapter->scsi_host->max_lun = 1;
582 adapter->scsi_host->max_channel = 0;
583 adapter->scsi_host->unique_id = unique_id++; /* FIXME */
584 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
Heiko Carstensdd52e0e2006-09-18 22:28:49 +0200585 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 /*
588 * save a pointer to our own adapter data structure within
589 * hostdata field of SCSI host data structure
590 */
591 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
592
593 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
594 scsi_host_put(adapter->scsi_host);
595 retval = -EIO;
596 goto out;
597 }
598 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
599 out:
600 return retval;
601}
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603void
604zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
605{
606 struct Scsi_Host *shost;
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200607 struct zfcp_port *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 shost = adapter->scsi_host;
610 if (!shost)
611 return;
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200612 read_lock_irq(&zfcp_data.config_lock);
613 list_for_each_entry(port, &adapter->port_list_head, list)
614 if (port->rport)
615 port->rport = NULL;
616 read_unlock_irq(&zfcp_data.config_lock);
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700617 fc_remove_host(shost);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 scsi_remove_host(shost);
619 scsi_host_put(shost);
620 adapter->scsi_host = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
622
623 return;
624}
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626/*
627 * Support functions for FC transport class
628 */
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100629static struct fc_host_statistics*
630zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100632 struct fc_host_statistics *fc_stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100634 if (!adapter->fc_stats) {
635 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
636 if (!fc_stats)
637 return NULL;
638 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
639 }
640 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
641 return adapter->fc_stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642}
643
644static void
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100645zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
646 struct fsf_qtcb_bottom_port *data,
647 struct fsf_qtcb_bottom_port *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100649 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
650 old->seconds_since_last_reset;
651 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
652 fc_stats->tx_words = data->tx_words - old->tx_words;
653 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
654 fc_stats->rx_words = data->rx_words - old->rx_words;
655 fc_stats->lip_count = data->lip - old->lip;
656 fc_stats->nos_count = data->nos - old->nos;
657 fc_stats->error_frames = data->error_frames - old->error_frames;
658 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
659 fc_stats->link_failure_count = data->link_failure - old->link_failure;
660 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
661 fc_stats->loss_of_signal_count = data->loss_of_signal -
662 old->loss_of_signal;
663 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
664 old->psp_error_counts;
665 fc_stats->invalid_tx_word_count = data->invalid_tx_words -
666 old->invalid_tx_words;
667 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
668 fc_stats->fcp_input_requests = data->input_requests -
669 old->input_requests;
670 fc_stats->fcp_output_requests = data->output_requests -
671 old->output_requests;
672 fc_stats->fcp_control_requests = data->control_requests -
673 old->control_requests;
674 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
675 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677
678static void
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100679zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
680 struct fsf_qtcb_bottom_port *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100682 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
683 fc_stats->tx_frames = data->tx_frames;
684 fc_stats->tx_words = data->tx_words;
685 fc_stats->rx_frames = data->rx_frames;
686 fc_stats->rx_words = data->rx_words;
687 fc_stats->lip_count = data->lip;
688 fc_stats->nos_count = data->nos;
689 fc_stats->error_frames = data->error_frames;
690 fc_stats->dumped_frames = data->dumped_frames;
691 fc_stats->link_failure_count = data->link_failure;
692 fc_stats->loss_of_sync_count = data->loss_of_sync;
693 fc_stats->loss_of_signal_count = data->loss_of_signal;
694 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
695 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
696 fc_stats->invalid_crc_count = data->invalid_crcs;
697 fc_stats->fcp_input_requests = data->input_requests;
698 fc_stats->fcp_output_requests = data->output_requests;
699 fc_stats->fcp_control_requests = data->control_requests;
700 fc_stats->fcp_input_megabytes = data->input_mb;
701 fc_stats->fcp_output_megabytes = data->output_mb;
702}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100704/**
705 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
706 *
707 * assumption: scsi_transport_fc synchronizes calls of
708 * get_fc_host_stats and reset_fc_host_stats
709 * (XXX to be checked otherwise introduce locking)
710 */
711static struct fc_host_statistics *
712zfcp_get_fc_host_stats(struct Scsi_Host *shost)
713{
714 struct zfcp_adapter *adapter;
715 struct fc_host_statistics *fc_stats;
716 struct fsf_qtcb_bottom_port *data;
717 int ret;
718
719 adapter = (struct zfcp_adapter *)shost->hostdata[0];
720 fc_stats = zfcp_init_fc_host_stats(adapter);
721 if (!fc_stats)
722 return NULL;
723
Andreas Herrmannec4081c2006-05-22 18:17:30 +0200724 data = kzalloc(sizeof(*data), GFP_KERNEL);
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100725 if (!data)
726 return NULL;
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100727
728 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
729 if (ret) {
730 kfree(data);
731 return NULL; /* XXX return zeroed fc_stats? */
732 }
733
734 if (adapter->stats_reset &&
735 ((jiffies/HZ - adapter->stats_reset) <
736 data->seconds_since_last_reset)) {
737 zfcp_adjust_fc_host_stats(fc_stats, data,
738 adapter->stats_reset_data);
739 } else
740 zfcp_set_fc_host_stats(fc_stats, data);
741
742 kfree(data);
743 return fc_stats;
744}
745
746static void
747zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
748{
749 struct zfcp_adapter *adapter;
750 struct fsf_qtcb_bottom_port *data, *old_data;
751 int ret;
752
753 adapter = (struct zfcp_adapter *)shost->hostdata[0];
Andreas Herrmannec4081c2006-05-22 18:17:30 +0200754 data = kzalloc(sizeof(*data), GFP_KERNEL);
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100755 if (!data)
756 return;
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100757
758 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
759 if (ret == 0) {
760 adapter->stats_reset = jiffies/HZ;
761 old_data = adapter->stats_reset_data;
762 adapter->stats_reset_data = data; /* finally freed in
763 adater_dequeue */
764 kfree(old_data);
765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
Andreas Herrmann338151e2006-05-22 18:25:56 +0200768static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
769{
770 rport->dev_loss_tmo = timeout;
771}
772
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773struct fc_function_template zfcp_transport_functions = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 .show_starget_port_id = 1,
775 .show_starget_port_name = 1,
776 .show_starget_node_name = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700777 .show_rport_supported_classes = 1,
Ralph Wuerthner75bfc282006-05-22 18:24:33 +0200778 .show_rport_maxframe_size = 1,
Andreas Herrmann338151e2006-05-22 18:25:56 +0200779 .show_rport_dev_loss_tmo = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700780 .show_host_node_name = 1,
781 .show_host_port_name = 1,
Andreas Herrmannad757cd2006-01-13 02:26:11 +0100782 .show_host_permanent_port_name = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700783 .show_host_supported_classes = 1,
Andreas Herrmannad757cd2006-01-13 02:26:11 +0100784 .show_host_supported_speeds = 1,
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200785 .show_host_maxframe_size = 1,
Andreas Herrmann3859f6a2005-08-27 11:07:54 -0700786 .show_host_serial_number = 1,
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100787 .get_fc_host_stats = zfcp_get_fc_host_stats,
788 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
Andreas Herrmann338151e2006-05-22 18:25:56 +0200789 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
Andreas Herrmannf6cd94b2006-01-05 09:59:34 +0100790 /* no functions registered for following dynamic attributes but
791 directly set by LLDD */
Andreas Herrmannad757cd2006-01-13 02:26:11 +0100792 .show_host_port_type = 1,
Andreas Herrmann13e1e1f2005-09-19 16:56:17 +0200793 .show_host_speed = 1,
794 .show_host_port_id = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795};
796
797/**
798 * ZFCP_DEFINE_SCSI_ATTR
799 * @_name: name of show attribute
800 * @_format: format string
801 * @_value: value to print
802 *
803 * Generates attribute for a unit.
804 */
805#define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
Yani Ioannou10523b32005-05-17 06:43:37 -0400806static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 char *buf) \
808{ \
809 struct scsi_device *sdev; \
810 struct zfcp_unit *unit; \
811 \
812 sdev = to_scsi_device(dev); \
813 unit = sdev->hostdata; \
814 return sprintf(buf, _format, _value); \
815} \
816 \
817static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
818
819ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
820ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
821ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
822
823static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {
824 &dev_attr_fcp_lun,
825 &dev_attr_wwpn,
826 &dev_attr_hba_id,
827 NULL
828};
829
830#undef ZFCP_LOG_AREA