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1da177e4 LT |
1 | /* |
2 | * | |
3 | * linux/drivers/s390/scsi/zfcp_scsi.c | |
4 | * | |
5 | * FCP adapter driver for IBM eServer zSeries | |
6 | * | |
7 | * (C) Copyright IBM Corp. 2002, 2004 | |
8 | * | |
9 | * Author(s): Martin Peschke <mpeschke@de.ibm.com> | |
10 | * Raimund Schroeder <raimund.schroeder@de.ibm.com> | |
11 | * Aron Zeh | |
12 | * Wolfgang Taphorn | |
13 | * Stefan Bader <stefan.bader@de.ibm.com> | |
14 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
15 | * Andreas Herrmann <aherrman@de.ibm.com> | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2, or (at your option) | |
20 | * any later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, | |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26 | * | |
27 | * You should have received a copy of the GNU General Public License | |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
30 | */ | |
31 | ||
32 | #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI | |
33 | ||
34 | #define ZFCP_SCSI_REVISION "$Revision: 1.74 $" | |
35 | ||
36 | #include "zfcp_ext.h" | |
37 | ||
38 | static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); | |
39 | static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); | |
40 | static int zfcp_scsi_slave_configure(struct scsi_device *sdp); | |
41 | static int zfcp_scsi_queuecommand(struct scsi_cmnd *, | |
42 | void (*done) (struct scsi_cmnd *)); | |
43 | static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); | |
44 | static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); | |
45 | static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *); | |
46 | static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); | |
47 | static int zfcp_task_management_function(struct zfcp_unit *, u8); | |
48 | ||
49 | static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t, | |
50 | scsi_lun_t); | |
51 | static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int, | |
52 | scsi_id_t); | |
53 | ||
54 | static struct device_attribute *zfcp_sysfs_sdev_attrs[]; | |
55 | ||
56 | struct scsi_transport_template *zfcp_transport_template; | |
57 | ||
58 | struct 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*/ | |
90 | char * | |
91 | zfcp_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*/ | |
102 | char * | |
103 | zfcp_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 | ||
116 | fcp_dl_t * | |
117 | zfcp_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 | ||
133 | fcp_dl_t | |
134 | zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) | |
135 | { | |
136 | return *zfcp_get_fcp_dl_ptr(fcp_cmd); | |
137 | } | |
138 | ||
139 | void | |
140 | zfcp_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 | */ | |
149 | static inline void | |
150 | set_byte(u32 * result, char status, char pos) | |
151 | { | |
152 | *result |= status << (pos * 8); | |
153 | } | |
154 | ||
155 | void | |
156 | set_host_byte(u32 * result, char status) | |
157 | { | |
158 | set_byte(result, status, 2); | |
159 | } | |
160 | ||
161 | void | |
162 | set_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 | ||
175 | static int | |
176 | zfcp_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 | ||
208 | static void | |
209 | zfcp_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 | */ | |
226 | static int | |
227 | zfcp_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 | */ | |
241 | static void | |
242 | zfcp_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 | */ | |
260 | int | |
261 | zfcp_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 | ||
306 | out: | |
307 | return retval; | |
308 | } | |
309 | ||
310 | void | |
311 | zfcp_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 | */ | |
327 | int | |
328 | zfcp_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 | */ | |
353 | int | |
354 | zfcp_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 | */ | |
384 | static struct zfcp_unit * | |
385 | zfcp_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 | ||
405 | static struct zfcp_port * | |
406 | zfcp_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 | */ | |
435 | int | |
8fa728a2 | 436 | __zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) |
1da177e4 LT |
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]; | |
1db2c9c0 | 578 | zfcp_fsf_req_free(new_fsf_req); |
1da177e4 LT |
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 | ||
8fa728a2 JG |
614 | int |
615 | zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) | |
616 | { | |
617 | int rc; | |
618 | struct Scsi_Host *scsi_host = scpnt->device->host; | |
619 | spin_lock_irq(scsi_host->host_lock); | |
620 | rc = __zfcp_scsi_eh_abort_handler(scpnt); | |
621 | spin_unlock_irq(scsi_host->host_lock); | |
622 | return rc; | |
623 | } | |
624 | ||
1da177e4 LT |
625 | /* |
626 | * function: zfcp_scsi_eh_device_reset_handler | |
627 | * | |
628 | * purpose: | |
629 | * | |
630 | * returns: | |
631 | */ | |
632 | int | |
633 | zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) | |
634 | { | |
635 | int retval; | |
636 | struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
637 | struct Scsi_Host *scsi_host = scpnt->device->host; | |
638 | ||
1da177e4 LT |
639 | if (!unit) { |
640 | ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); | |
641 | retval = SUCCESS; | |
642 | goto out; | |
643 | } | |
644 | ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); | |
645 | ||
646 | /* | |
647 | * If we do not know whether the unit supports 'logical unit reset' | |
648 | * then try 'logical unit reset' and proceed with 'target reset' | |
649 | * if 'logical unit reset' fails. | |
650 | * If the unit is known not to support 'logical unit reset' then | |
651 | * skip 'logical unit reset' and try 'target reset' immediately. | |
652 | */ | |
653 | if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, | |
654 | &unit->status)) { | |
655 | retval = | |
656 | zfcp_task_management_function(unit, FCP_LOGICAL_UNIT_RESET); | |
657 | if (retval) { | |
658 | ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); | |
659 | if (retval == -ENOTSUPP) | |
660 | atomic_set_mask | |
661 | (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, | |
662 | &unit->status); | |
663 | /* fall through and try 'target reset' next */ | |
664 | } else { | |
665 | ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", | |
666 | unit); | |
667 | /* avoid 'target reset' */ | |
668 | retval = SUCCESS; | |
669 | goto out; | |
670 | } | |
671 | } | |
672 | retval = zfcp_task_management_function(unit, FCP_TARGET_RESET); | |
673 | if (retval) { | |
674 | ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); | |
675 | retval = FAILED; | |
676 | } else { | |
677 | ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); | |
678 | retval = SUCCESS; | |
679 | } | |
680 | out: | |
1da177e4 LT |
681 | return retval; |
682 | } | |
683 | ||
684 | static int | |
685 | zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags) | |
686 | { | |
687 | struct zfcp_adapter *adapter = unit->port->adapter; | |
688 | int retval; | |
689 | int status; | |
690 | struct zfcp_fsf_req *fsf_req; | |
691 | ||
692 | /* issue task management function */ | |
693 | fsf_req = zfcp_fsf_send_fcp_command_task_management | |
694 | (adapter, unit, tm_flags, 0); | |
695 | if (!fsf_req) { | |
696 | ZFCP_LOG_INFO("error: creation of task management request " | |
697 | "failed for unit 0x%016Lx on port 0x%016Lx on " | |
698 | "adapter %s\n", unit->fcp_lun, unit->port->wwpn, | |
699 | zfcp_get_busid_by_adapter(adapter)); | |
700 | retval = -ENOMEM; | |
701 | goto out; | |
702 | } | |
703 | ||
704 | retval = zfcp_fsf_req_wait_and_cleanup(fsf_req, | |
705 | ZFCP_UNINTERRUPTIBLE, &status); | |
706 | /* | |
707 | * check completion status of task management function | |
708 | * (status should always be valid since no signals permitted) | |
709 | */ | |
710 | if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) | |
711 | retval = -EIO; | |
712 | else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) | |
713 | retval = -ENOTSUPP; | |
714 | else | |
715 | retval = 0; | |
716 | out: | |
717 | return retval; | |
718 | } | |
719 | ||
720 | /* | |
721 | * function: zfcp_scsi_eh_bus_reset_handler | |
722 | * | |
723 | * purpose: | |
724 | * | |
725 | * returns: | |
726 | */ | |
727 | int | |
728 | zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) | |
729 | { | |
730 | int retval = 0; | |
731 | struct zfcp_unit *unit; | |
732 | struct Scsi_Host *scsi_host = scpnt->device->host; | |
733 | ||
1da177e4 LT |
734 | unit = (struct zfcp_unit *) scpnt->device->hostdata; |
735 | ZFCP_LOG_NORMAL("bus reset because of problems with " | |
736 | "unit 0x%016Lx\n", unit->fcp_lun); | |
737 | zfcp_erp_adapter_reopen(unit->port->adapter, 0); | |
738 | zfcp_erp_wait(unit->port->adapter); | |
739 | retval = SUCCESS; | |
740 | ||
1da177e4 LT |
741 | return retval; |
742 | } | |
743 | ||
744 | /* | |
745 | * function: zfcp_scsi_eh_host_reset_handler | |
746 | * | |
747 | * purpose: | |
748 | * | |
749 | * returns: | |
750 | */ | |
751 | int | |
752 | zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) | |
753 | { | |
754 | int retval = 0; | |
755 | struct zfcp_unit *unit; | |
756 | struct Scsi_Host *scsi_host = scpnt->device->host; | |
757 | ||
1da177e4 LT |
758 | unit = (struct zfcp_unit *) scpnt->device->hostdata; |
759 | ZFCP_LOG_NORMAL("host reset because of problems with " | |
760 | "unit 0x%016Lx\n", unit->fcp_lun); | |
761 | zfcp_erp_adapter_reopen(unit->port->adapter, 0); | |
762 | zfcp_erp_wait(unit->port->adapter); | |
763 | retval = SUCCESS; | |
764 | ||
1da177e4 LT |
765 | return retval; |
766 | } | |
767 | ||
768 | /* | |
769 | * function: | |
770 | * | |
771 | * purpose: | |
772 | * | |
773 | * returns: | |
774 | */ | |
775 | int | |
776 | zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) | |
777 | { | |
778 | int retval = 0; | |
779 | static unsigned int unique_id = 0; | |
780 | ||
781 | /* register adapter as SCSI host with mid layer of SCSI stack */ | |
782 | adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, | |
783 | sizeof (struct zfcp_adapter *)); | |
784 | if (!adapter->scsi_host) { | |
785 | ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " | |
786 | "for adapter %s ", | |
787 | zfcp_get_busid_by_adapter(adapter)); | |
788 | retval = -EIO; | |
789 | goto out; | |
790 | } | |
791 | ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); | |
792 | ||
793 | /* tell the SCSI stack some characteristics of this adapter */ | |
794 | adapter->scsi_host->max_id = 1; | |
795 | adapter->scsi_host->max_lun = 1; | |
796 | adapter->scsi_host->max_channel = 0; | |
797 | adapter->scsi_host->unique_id = unique_id++; /* FIXME */ | |
798 | adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; | |
799 | adapter->scsi_host->transportt = zfcp_transport_template; | |
800 | /* | |
801 | * Reverse mapping of the host number to avoid race condition | |
802 | */ | |
803 | adapter->scsi_host_no = adapter->scsi_host->host_no; | |
804 | ||
805 | /* | |
806 | * save a pointer to our own adapter data structure within | |
807 | * hostdata field of SCSI host data structure | |
808 | */ | |
809 | adapter->scsi_host->hostdata[0] = (unsigned long) adapter; | |
810 | ||
811 | if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { | |
812 | scsi_host_put(adapter->scsi_host); | |
813 | retval = -EIO; | |
814 | goto out; | |
815 | } | |
816 | atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); | |
817 | out: | |
818 | return retval; | |
819 | } | |
820 | ||
821 | /* | |
822 | * function: | |
823 | * | |
824 | * purpose: | |
825 | * | |
826 | * returns: | |
827 | */ | |
828 | void | |
829 | zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) | |
830 | { | |
831 | struct Scsi_Host *shost; | |
832 | ||
833 | shost = adapter->scsi_host; | |
834 | if (!shost) | |
835 | return; | |
836 | scsi_remove_host(shost); | |
837 | scsi_host_put(shost); | |
838 | adapter->scsi_host = NULL; | |
839 | adapter->scsi_host_no = 0; | |
840 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); | |
841 | ||
842 | return; | |
843 | } | |
844 | ||
845 | ||
846 | void | |
847 | zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) | |
848 | { | |
849 | adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; | |
850 | adapter->scsi_er_timer.data = (unsigned long) adapter; | |
851 | adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; | |
852 | add_timer(&adapter->scsi_er_timer); | |
853 | } | |
854 | ||
855 | /* | |
856 | * Support functions for FC transport class | |
857 | */ | |
858 | static void | |
859 | zfcp_get_port_id(struct scsi_target *starget) | |
860 | { | |
861 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
862 | struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; | |
863 | struct zfcp_port *port; | |
864 | unsigned long flags; | |
865 | ||
866 | read_lock_irqsave(&zfcp_data.config_lock, flags); | |
867 | port = zfcp_port_lookup(adapter, starget->channel, starget->id); | |
868 | if (port) | |
869 | fc_starget_port_id(starget) = port->d_id; | |
870 | else | |
871 | fc_starget_port_id(starget) = -1; | |
872 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); | |
873 | } | |
874 | ||
875 | static void | |
876 | zfcp_get_port_name(struct scsi_target *starget) | |
877 | { | |
878 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
879 | struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; | |
880 | struct zfcp_port *port; | |
881 | unsigned long flags; | |
882 | ||
883 | read_lock_irqsave(&zfcp_data.config_lock, flags); | |
884 | port = zfcp_port_lookup(adapter, starget->channel, starget->id); | |
885 | if (port) | |
886 | fc_starget_port_name(starget) = port->wwpn; | |
887 | else | |
888 | fc_starget_port_name(starget) = -1; | |
889 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); | |
890 | } | |
891 | ||
892 | static void | |
893 | zfcp_get_node_name(struct scsi_target *starget) | |
894 | { | |
895 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
896 | struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; | |
897 | struct zfcp_port *port; | |
898 | unsigned long flags; | |
899 | ||
900 | read_lock_irqsave(&zfcp_data.config_lock, flags); | |
901 | port = zfcp_port_lookup(adapter, starget->channel, starget->id); | |
902 | if (port) | |
903 | fc_starget_node_name(starget) = port->wwnn; | |
904 | else | |
905 | fc_starget_node_name(starget) = -1; | |
906 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); | |
907 | } | |
908 | ||
909 | struct fc_function_template zfcp_transport_functions = { | |
910 | .get_starget_port_id = zfcp_get_port_id, | |
911 | .get_starget_port_name = zfcp_get_port_name, | |
912 | .get_starget_node_name = zfcp_get_node_name, | |
913 | .show_starget_port_id = 1, | |
914 | .show_starget_port_name = 1, | |
915 | .show_starget_node_name = 1, | |
916 | }; | |
917 | ||
918 | /** | |
919 | * ZFCP_DEFINE_SCSI_ATTR | |
920 | * @_name: name of show attribute | |
921 | * @_format: format string | |
922 | * @_value: value to print | |
923 | * | |
924 | * Generates attribute for a unit. | |
925 | */ | |
926 | #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ | |
10523b3b | 927 | static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
928 | char *buf) \ |
929 | { \ | |
930 | struct scsi_device *sdev; \ | |
931 | struct zfcp_unit *unit; \ | |
932 | \ | |
933 | sdev = to_scsi_device(dev); \ | |
934 | unit = sdev->hostdata; \ | |
935 | return sprintf(buf, _format, _value); \ | |
936 | } \ | |
937 | \ | |
938 | static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); | |
939 | ||
940 | ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); | |
941 | ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); | |
942 | ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); | |
943 | ||
944 | static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { | |
945 | &dev_attr_fcp_lun, | |
946 | &dev_attr_wwpn, | |
947 | &dev_attr_hba_id, | |
948 | NULL | |
949 | }; | |
950 | ||
951 | #undef ZFCP_LOG_AREA |