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Commit | Line | Data |
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1da177e4 | 1 | /* |
4a9d2d8b AH |
2 | * This file is part of the zfcp device driver for |
3 | * FCP adapters for IBM System z9 and zSeries. | |
1da177e4 | 4 | * |
4a9d2d8b | 5 | * (C) Copyright IBM Corp. 2002, 2006 |
1da177e4 LT |
6 | * |
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 | ||
1da177e4 LT |
24 | #include "zfcp_ext.h" |
25 | ||
26 | static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); | |
27 | static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); | |
28 | static int zfcp_scsi_slave_configure(struct scsi_device *sdp); | |
29 | static int zfcp_scsi_queuecommand(struct scsi_cmnd *, | |
30 | void (*done) (struct scsi_cmnd *)); | |
31 | static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); | |
32 | static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); | |
1da177e4 | 33 | static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); |
8a36e453 MS |
34 | static int zfcp_task_management_function(struct zfcp_unit *, u8, |
35 | struct scsi_cmnd *); | |
1da177e4 | 36 | |
06506d00 AH |
37 | static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, |
38 | unsigned int, unsigned int); | |
1da177e4 LT |
39 | |
40 | static struct device_attribute *zfcp_sysfs_sdev_attrs[]; | |
41 | ||
1da177e4 LT |
42 | struct zfcp_data zfcp_data = { |
43 | .scsi_host_template = { | |
d2c993d8 | 44 | .name = ZFCP_NAME, |
dd52e0ea | 45 | .module = THIS_MODULE, |
d2c993d8 | 46 | .proc_name = "zfcp", |
d2c993d8 HC |
47 | .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, | |
f6c0e7a7 | 53 | .eh_bus_reset_handler = zfcp_scsi_eh_host_reset_handler, |
d2c993d8 HC |
54 | .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, |
55 | .can_queue = 4096, | |
56 | .this_id = -1, | |
d2c993d8 HC |
57 | .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, |
58 | .cmd_per_lun = 1, | |
d2c993d8 HC |
59 | .use_clustering = 1, |
60 | .sdev_attrs = zfcp_sysfs_sdev_attrs, | |
1da177e4 LT |
61 | }, |
62 | .driver_version = ZFCP_VERSION, | |
1da177e4 LT |
63 | }; |
64 | ||
65 | /* Find start of Response Information in FCP response unit*/ | |
66 | char * | |
67 | zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) | |
68 | { | |
69 | char *fcp_rsp_info_ptr; | |
70 | ||
71 | fcp_rsp_info_ptr = | |
72 | (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); | |
73 | ||
74 | return fcp_rsp_info_ptr; | |
75 | } | |
76 | ||
77 | /* Find start of Sense Information in FCP response unit*/ | |
78 | char * | |
79 | zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) | |
80 | { | |
81 | char *fcp_sns_info_ptr; | |
82 | ||
83 | fcp_sns_info_ptr = | |
84 | (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); | |
85 | if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) | |
86 | fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + | |
87 | fcp_rsp_iu->fcp_rsp_len; | |
88 | ||
89 | return fcp_sns_info_ptr; | |
90 | } | |
91 | ||
92 | fcp_dl_t * | |
93 | zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) | |
94 | { | |
95 | int additional_length = fcp_cmd->add_fcp_cdb_length << 2; | |
96 | fcp_dl_t *fcp_dl_addr; | |
97 | ||
98 | fcp_dl_addr = (fcp_dl_t *) | |
99 | ((unsigned char *) fcp_cmd + | |
100 | sizeof (struct fcp_cmnd_iu) + additional_length); | |
101 | /* | |
102 | * fcp_dl_addr = start address of fcp_cmnd structure + | |
103 | * size of fixed part + size of dynamically sized add_dcp_cdb field | |
104 | * SEE FCP-2 documentation | |
105 | */ | |
106 | return fcp_dl_addr; | |
107 | } | |
108 | ||
109 | fcp_dl_t | |
110 | zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) | |
111 | { | |
112 | return *zfcp_get_fcp_dl_ptr(fcp_cmd); | |
113 | } | |
114 | ||
115 | void | |
116 | zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) | |
117 | { | |
118 | *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; | |
119 | } | |
120 | ||
121 | /* | |
122 | * note: it's a bit-or operation not an assignment | |
123 | * regarding the specified byte | |
124 | */ | |
125 | static inline void | |
126 | set_byte(u32 * result, char status, char pos) | |
127 | { | |
128 | *result |= status << (pos * 8); | |
129 | } | |
130 | ||
131 | void | |
132 | set_host_byte(u32 * result, char status) | |
133 | { | |
134 | set_byte(result, status, 2); | |
135 | } | |
136 | ||
137 | void | |
138 | set_driver_byte(u32 * result, char status) | |
139 | { | |
140 | set_byte(result, status, 3); | |
141 | } | |
142 | ||
1da177e4 LT |
143 | static int |
144 | zfcp_scsi_slave_alloc(struct scsi_device *sdp) | |
145 | { | |
146 | struct zfcp_adapter *adapter; | |
147 | struct zfcp_unit *unit; | |
148 | unsigned long flags; | |
fb121b06 | 149 | int retval = -ENXIO; |
1da177e4 LT |
150 | |
151 | adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; | |
152 | if (!adapter) | |
153 | goto out; | |
154 | ||
155 | read_lock_irqsave(&zfcp_data.config_lock, flags); | |
156 | unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); | |
ad58f7db AH |
157 | if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, |
158 | &unit->status)) { | |
1da177e4 LT |
159 | sdp->hostdata = unit; |
160 | unit->device = sdp; | |
161 | zfcp_unit_get(unit); | |
162 | retval = 0; | |
163 | } | |
164 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); | |
165 | out: | |
166 | return retval; | |
167 | } | |
168 | ||
f6c0e7a7 AH |
169 | /** |
170 | * zfcp_scsi_slave_destroy - called when scsi device is removed | |
171 | * | |
172 | * Remove reference to associated scsi device for an zfcp_unit. | |
173 | * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs | |
174 | * or a scan for this device might have failed. | |
175 | */ | |
176 | static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) | |
1da177e4 LT |
177 | { |
178 | struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; | |
179 | ||
180 | if (unit) { | |
ad58f7db | 181 | atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); |
1da177e4 LT |
182 | sdpnt->hostdata = NULL; |
183 | unit->device = NULL; | |
f6c0e7a7 | 184 | zfcp_erp_unit_failed(unit); |
1da177e4 LT |
185 | zfcp_unit_put(unit); |
186 | } else { | |
187 | ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " | |
188 | "address %p\n", sdpnt); | |
189 | } | |
190 | } | |
191 | ||
192 | /* | |
193 | * called from scsi midlayer to allow finetuning of a device. | |
194 | */ | |
195 | static int | |
196 | zfcp_scsi_slave_configure(struct scsi_device *sdp) | |
197 | { | |
198 | if (sdp->tagged_supported) | |
199 | scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); | |
200 | else | |
201 | scsi_adjust_queue_depth(sdp, 0, 1); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | /** | |
206 | * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function | |
207 | * @scpnt: pointer to struct scsi_cmnd where result is set | |
208 | * @result: result to be set in scpnt (e.g. DID_ERROR) | |
209 | */ | |
210 | static void | |
211 | zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) | |
212 | { | |
213 | set_host_byte(&scpnt->result, result); | |
8a36e453 MS |
214 | if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) |
215 | zfcp_scsi_dbf_event_result("fail", 4, | |
216 | (struct zfcp_adapter*) scpnt->device->host->hostdata[0], | |
ed829ad6 | 217 | scpnt, NULL); |
1da177e4 LT |
218 | /* return directly */ |
219 | scpnt->scsi_done(scpnt); | |
220 | } | |
221 | ||
222 | /** | |
223 | * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and | |
224 | * zfcp_scsi_command_sync | |
225 | * @adapter: adapter where scsi command is issued | |
226 | * @unit: unit to which scsi command is sent | |
227 | * @scpnt: scsi command to be sent | |
228 | * @timer: timer to be started if request is successfully initiated | |
229 | * | |
230 | * Note: In scsi_done function must be set in scpnt. | |
231 | */ | |
232 | int | |
233 | zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, | |
234 | struct scsi_cmnd *scpnt, struct timer_list *timer) | |
235 | { | |
236 | int tmp; | |
237 | int retval; | |
238 | ||
239 | retval = 0; | |
240 | ||
241 | BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); | |
242 | BUG_ON(scpnt->scsi_done == NULL); | |
243 | ||
244 | if (unlikely(NULL == unit)) { | |
245 | zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); | |
246 | goto out; | |
247 | } | |
248 | ||
249 | if (unlikely( | |
250 | atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || | |
251 | !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { | |
252 | ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " | |
253 | "0x%016Lx on adapter %s\n", | |
254 | unit->fcp_lun, unit->port->wwpn, | |
255 | zfcp_get_busid_by_adapter(adapter)); | |
256 | zfcp_scsi_command_fail(scpnt, DID_ERROR); | |
257 | goto out; | |
258 | } | |
259 | ||
260 | if (unlikely( | |
261 | !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { | |
262 | ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " | |
263 | "on port 0x%016Lx in recovery\n", | |
264 | zfcp_get_busid_by_unit(unit), | |
265 | unit->fcp_lun, unit->port->wwpn); | |
ad58f7db | 266 | zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); |
1da177e4 LT |
267 | goto out; |
268 | } | |
269 | ||
270 | tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer, | |
271 | ZFCP_REQ_AUTO_CLEANUP); | |
272 | ||
273 | if (unlikely(tmp < 0)) { | |
274 | ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); | |
275 | retval = SCSI_MLQUEUE_HOST_BUSY; | |
276 | } | |
277 | ||
278 | out: | |
279 | return retval; | |
280 | } | |
281 | ||
282 | void | |
283 | zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) | |
284 | { | |
285 | struct completion *wait = (struct completion *) scpnt->SCp.ptr; | |
286 | complete(wait); | |
287 | } | |
288 | ||
289 | ||
290 | /** | |
291 | * zfcp_scsi_command_sync - send a SCSI command and wait for completion | |
292 | * @unit: unit where command is sent to | |
293 | * @scpnt: scsi command to be sent | |
294 | * @timer: timer to be started if request is successfully initiated | |
295 | * Return: 0 | |
296 | * | |
297 | * Errors are indicated in scpnt->result | |
298 | */ | |
299 | int | |
300 | zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, | |
301 | struct timer_list *timer) | |
302 | { | |
303 | int ret; | |
304 | DECLARE_COMPLETION(wait); | |
305 | ||
306 | scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ | |
307 | scpnt->scsi_done = zfcp_scsi_command_sync_handler; | |
308 | ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer); | |
309 | if (ret == 0) | |
310 | wait_for_completion(&wait); | |
311 | ||
312 | scpnt->SCp.ptr = NULL; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | /* | |
318 | * function: zfcp_scsi_queuecommand | |
319 | * | |
320 | * purpose: enqueues a SCSI command to the specified target device | |
321 | * | |
322 | * returns: 0 - success, SCSI command enqueued | |
323 | * !0 - failure | |
324 | */ | |
325 | int | |
326 | zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, | |
327 | void (*done) (struct scsi_cmnd *)) | |
328 | { | |
329 | struct zfcp_unit *unit; | |
330 | struct zfcp_adapter *adapter; | |
331 | ||
332 | /* reset the status for this request */ | |
333 | scpnt->result = 0; | |
334 | scpnt->host_scribble = NULL; | |
335 | scpnt->scsi_done = done; | |
336 | ||
337 | /* | |
338 | * figure out adapter and target device | |
339 | * (stored there by zfcp_scsi_slave_alloc) | |
340 | */ | |
341 | adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; | |
342 | unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
343 | ||
344 | return zfcp_scsi_command_async(adapter, unit, scpnt, NULL); | |
345 | } | |
346 | ||
1da177e4 | 347 | static struct zfcp_unit * |
06506d00 AH |
348 | zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, |
349 | unsigned int lun) | |
1da177e4 LT |
350 | { |
351 | struct zfcp_port *port; | |
352 | struct zfcp_unit *unit, *retval = NULL; | |
353 | ||
354 | list_for_each_entry(port, &adapter->port_list_head, list) { | |
3859f6a2 | 355 | if (!port->rport || (id != port->rport->scsi_target_id)) |
1da177e4 LT |
356 | continue; |
357 | list_for_each_entry(unit, &port->unit_list_head, list) { | |
358 | if (lun == unit->scsi_lun) { | |
359 | retval = unit; | |
360 | goto out; | |
361 | } | |
362 | } | |
363 | } | |
364 | out: | |
365 | return retval; | |
366 | } | |
367 | ||
059c97d0 AH |
368 | /** |
369 | * zfcp_scsi_eh_abort_handler - abort the specified SCSI command | |
370 | * @scpnt: pointer to scsi_cmnd to be aborted | |
371 | * Return: SUCCESS - command has been aborted and cleaned up in internal | |
372 | * bookkeeping, SCSI stack won't be called for aborted command | |
373 | * FAILED - otherwise | |
1da177e4 | 374 | * |
059c97d0 AH |
375 | * We do not need to care for a SCSI command which completes normally |
376 | * but late during this abort routine runs. We are allowed to return | |
377 | * late commands to the SCSI stack. It tracks the state of commands and | |
378 | * will handle late commands. (Usually, the normal completion of late | |
379 | * commands is ignored with respect to the running abort operation.) | |
1da177e4 LT |
380 | */ |
381 | int | |
059c97d0 | 382 | zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) |
1da177e4 | 383 | { |
059c97d0 AH |
384 | struct Scsi_Host *scsi_host; |
385 | struct zfcp_adapter *adapter; | |
386 | struct zfcp_unit *unit; | |
1da177e4 | 387 | int retval = SUCCESS; |
8a36e453 MS |
388 | struct zfcp_fsf_req *new_fsf_req = NULL; |
389 | struct zfcp_fsf_req *old_fsf_req; | |
1da177e4 | 390 | unsigned long flags; |
059c97d0 AH |
391 | |
392 | scsi_host = scpnt->device->host; | |
393 | adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; | |
394 | unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
1da177e4 LT |
395 | |
396 | ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", | |
397 | scpnt, zfcp_get_busid_by_adapter(adapter)); | |
398 | ||
059c97d0 | 399 | /* avoid race condition between late normal completion and abort */ |
1da177e4 LT |
400 | write_lock_irqsave(&adapter->abort_lock, flags); |
401 | ||
402 | /* | |
403 | * Check whether command has just completed and can not be aborted. | |
404 | * Even if the command has just been completed late, we can access | |
405 | * scpnt since the SCSI stack does not release it at least until | |
406 | * this routine returns. (scpnt is parameter passed to this routine | |
407 | * and must not disappear during abort even on late completion.) | |
408 | */ | |
059c97d0 | 409 | old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble; |
1da177e4 LT |
410 | if (!old_fsf_req) { |
411 | write_unlock_irqrestore(&adapter->abort_lock, flags); | |
ed829ad6 | 412 | zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL); |
8a36e453 | 413 | retval = SUCCESS; |
1da177e4 LT |
414 | goto out; |
415 | } | |
059c97d0 | 416 | old_fsf_req->data = 0; |
1da177e4 | 417 | old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; |
1da177e4 | 418 | |
059c97d0 | 419 | /* don't access old_fsf_req after releasing the abort_lock */ |
1da177e4 LT |
420 | write_unlock_irqrestore(&adapter->abort_lock, flags); |
421 | /* call FSF routine which does the abort */ | |
422 | new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req, | |
423 | adapter, unit, 0); | |
1da177e4 | 424 | if (!new_fsf_req) { |
8a36e453 | 425 | ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); |
ed829ad6 MS |
426 | zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, |
427 | old_fsf_req); | |
1da177e4 | 428 | retval = FAILED; |
1da177e4 LT |
429 | goto out; |
430 | } | |
431 | ||
432 | /* wait for completion of abort */ | |
1da177e4 LT |
433 | __wait_event(new_fsf_req->completion_wq, |
434 | new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); | |
059c97d0 | 435 | |
1da177e4 | 436 | /* status should be valid since signals were not permitted */ |
059c97d0 | 437 | if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { |
ed829ad6 MS |
438 | zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req, |
439 | NULL); | |
1da177e4 | 440 | retval = SUCCESS; |
059c97d0 | 441 | } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { |
ed829ad6 MS |
442 | zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req, |
443 | NULL); | |
1da177e4 | 444 | retval = SUCCESS; |
1da177e4 | 445 | } else { |
ed829ad6 MS |
446 | zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req, |
447 | NULL); | |
1da177e4 | 448 | retval = FAILED; |
1da177e4 | 449 | } |
8a36e453 | 450 | zfcp_fsf_req_free(new_fsf_req); |
1da177e4 | 451 | out: |
1da177e4 LT |
452 | return retval; |
453 | } | |
454 | ||
1da177e4 LT |
455 | int |
456 | zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) | |
457 | { | |
458 | int retval; | |
459 | struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
1da177e4 | 460 | |
1da177e4 LT |
461 | if (!unit) { |
462 | ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); | |
463 | retval = SUCCESS; | |
464 | goto out; | |
465 | } | |
466 | ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); | |
467 | ||
468 | /* | |
469 | * If we do not know whether the unit supports 'logical unit reset' | |
470 | * then try 'logical unit reset' and proceed with 'target reset' | |
471 | * if 'logical unit reset' fails. | |
472 | * If the unit is known not to support 'logical unit reset' then | |
473 | * skip 'logical unit reset' and try 'target reset' immediately. | |
474 | */ | |
475 | if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, | |
476 | &unit->status)) { | |
8a36e453 MS |
477 | retval = zfcp_task_management_function(unit, |
478 | FCP_LOGICAL_UNIT_RESET, | |
479 | scpnt); | |
1da177e4 LT |
480 | if (retval) { |
481 | ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); | |
482 | if (retval == -ENOTSUPP) | |
483 | atomic_set_mask | |
484 | (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, | |
485 | &unit->status); | |
486 | /* fall through and try 'target reset' next */ | |
487 | } else { | |
488 | ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", | |
489 | unit); | |
490 | /* avoid 'target reset' */ | |
491 | retval = SUCCESS; | |
492 | goto out; | |
493 | } | |
494 | } | |
8a36e453 | 495 | retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); |
1da177e4 LT |
496 | if (retval) { |
497 | ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); | |
498 | retval = FAILED; | |
499 | } else { | |
500 | ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); | |
501 | retval = SUCCESS; | |
502 | } | |
503 | out: | |
1da177e4 LT |
504 | return retval; |
505 | } | |
506 | ||
507 | static int | |
8a36e453 MS |
508 | zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, |
509 | struct scsi_cmnd *scpnt) | |
1da177e4 LT |
510 | { |
511 | struct zfcp_adapter *adapter = unit->port->adapter; | |
1da177e4 | 512 | struct zfcp_fsf_req *fsf_req; |
77eb1699 | 513 | int retval = 0; |
1da177e4 LT |
514 | |
515 | /* issue task management function */ | |
516 | fsf_req = zfcp_fsf_send_fcp_command_task_management | |
517 | (adapter, unit, tm_flags, 0); | |
518 | if (!fsf_req) { | |
519 | ZFCP_LOG_INFO("error: creation of task management request " | |
520 | "failed for unit 0x%016Lx on port 0x%016Lx on " | |
521 | "adapter %s\n", unit->fcp_lun, unit->port->wwpn, | |
522 | zfcp_get_busid_by_adapter(adapter)); | |
8a36e453 | 523 | zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); |
1da177e4 LT |
524 | retval = -ENOMEM; |
525 | goto out; | |
526 | } | |
527 | ||
77eb1699 AH |
528 | __wait_event(fsf_req->completion_wq, |
529 | fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); | |
530 | ||
8a36e453 MS |
531 | /* |
532 | * check completion status of task management function | |
533 | */ | |
534 | if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { | |
535 | zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); | |
1da177e4 | 536 | retval = -EIO; |
8a36e453 MS |
537 | } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { |
538 | zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); | |
1da177e4 | 539 | retval = -ENOTSUPP; |
8a36e453 MS |
540 | } else |
541 | zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); | |
77eb1699 AH |
542 | |
543 | zfcp_fsf_req_free(fsf_req); | |
1da177e4 LT |
544 | out: |
545 | return retval; | |
546 | } | |
547 | ||
810f1e3e | 548 | /** |
f6c0e7a7 AH |
549 | * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset |
550 | * | |
551 | * If ERP is already running it will be stopped. | |
1da177e4 | 552 | */ |
f6c0e7a7 | 553 | int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) |
1da177e4 | 554 | { |
f6c0e7a7 AH |
555 | struct zfcp_unit *unit; |
556 | struct zfcp_adapter *adapter; | |
557 | unsigned long flags; | |
1da177e4 | 558 | |
f6c0e7a7 AH |
559 | unit = (struct zfcp_unit*) scpnt->device->hostdata; |
560 | adapter = unit->port->adapter; | |
1da177e4 | 561 | |
f6c0e7a7 | 562 | ZFCP_LOG_NORMAL("host/bus reset because of problems with " |
1da177e4 | 563 | "unit 0x%016Lx\n", unit->fcp_lun); |
f6c0e7a7 AH |
564 | |
565 | write_lock_irqsave(&adapter->erp_lock, flags); | |
566 | if (atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, | |
567 | &adapter->status)) { | |
568 | zfcp_erp_modify_adapter_status(adapter, | |
569 | ZFCP_STATUS_COMMON_UNBLOCKED|ZFCP_STATUS_COMMON_OPEN, | |
570 | ZFCP_CLEAR); | |
571 | zfcp_erp_action_dismiss_adapter(adapter); | |
572 | write_unlock_irqrestore(&adapter->erp_lock, flags); | |
573 | zfcp_fsf_req_dismiss_all(adapter); | |
574 | adapter->fsf_req_seq_no = 0; | |
575 | zfcp_erp_adapter_reopen(adapter, 0); | |
576 | } else { | |
577 | write_unlock_irqrestore(&adapter->erp_lock, flags); | |
578 | zfcp_erp_adapter_reopen(adapter, 0); | |
579 | zfcp_erp_wait(adapter); | |
580 | } | |
1da177e4 | 581 | |
810f1e3e | 582 | return SUCCESS; |
1da177e4 LT |
583 | } |
584 | ||
1da177e4 LT |
585 | int |
586 | zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) | |
587 | { | |
588 | int retval = 0; | |
589 | static unsigned int unique_id = 0; | |
590 | ||
591 | /* register adapter as SCSI host with mid layer of SCSI stack */ | |
592 | adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, | |
593 | sizeof (struct zfcp_adapter *)); | |
594 | if (!adapter->scsi_host) { | |
595 | ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " | |
596 | "for adapter %s ", | |
597 | zfcp_get_busid_by_adapter(adapter)); | |
598 | retval = -EIO; | |
599 | goto out; | |
600 | } | |
601 | ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); | |
602 | ||
603 | /* tell the SCSI stack some characteristics of this adapter */ | |
604 | adapter->scsi_host->max_id = 1; | |
605 | adapter->scsi_host->max_lun = 1; | |
606 | adapter->scsi_host->max_channel = 0; | |
607 | adapter->scsi_host->unique_id = unique_id++; /* FIXME */ | |
608 | adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; | |
dd52e0ea | 609 | adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; |
1da177e4 LT |
610 | |
611 | /* | |
612 | * save a pointer to our own adapter data structure within | |
613 | * hostdata field of SCSI host data structure | |
614 | */ | |
615 | adapter->scsi_host->hostdata[0] = (unsigned long) adapter; | |
616 | ||
617 | if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { | |
618 | scsi_host_put(adapter->scsi_host); | |
619 | retval = -EIO; | |
620 | goto out; | |
621 | } | |
622 | atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); | |
623 | out: | |
624 | return retval; | |
625 | } | |
626 | ||
1da177e4 LT |
627 | void |
628 | zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) | |
629 | { | |
630 | struct Scsi_Host *shost; | |
13e1e1f0 | 631 | struct zfcp_port *port; |
1da177e4 LT |
632 | |
633 | shost = adapter->scsi_host; | |
634 | if (!shost) | |
635 | return; | |
13e1e1f0 AH |
636 | read_lock_irq(&zfcp_data.config_lock); |
637 | list_for_each_entry(port, &adapter->port_list_head, list) | |
638 | if (port->rport) | |
639 | port->rport = NULL; | |
640 | read_unlock_irq(&zfcp_data.config_lock); | |
3859f6a2 | 641 | fc_remove_host(shost); |
1da177e4 LT |
642 | scsi_remove_host(shost); |
643 | scsi_host_put(shost); | |
644 | adapter->scsi_host = NULL; | |
1da177e4 LT |
645 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); |
646 | ||
647 | return; | |
648 | } | |
649 | ||
650 | ||
651 | void | |
652 | zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) | |
653 | { | |
654 | adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; | |
655 | adapter->scsi_er_timer.data = (unsigned long) adapter; | |
656 | adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; | |
657 | add_timer(&adapter->scsi_er_timer); | |
658 | } | |
659 | ||
660 | /* | |
661 | * Support functions for FC transport class | |
662 | */ | |
f6cd94b1 AH |
663 | static struct fc_host_statistics* |
664 | zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) | |
1da177e4 | 665 | { |
f6cd94b1 | 666 | struct fc_host_statistics *fc_stats; |
1da177e4 | 667 | |
f6cd94b1 AH |
668 | if (!adapter->fc_stats) { |
669 | fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); | |
670 | if (!fc_stats) | |
671 | return NULL; | |
672 | adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ | |
673 | } | |
674 | memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); | |
675 | return adapter->fc_stats; | |
1da177e4 LT |
676 | } |
677 | ||
678 | static void | |
f6cd94b1 AH |
679 | zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, |
680 | struct fsf_qtcb_bottom_port *data, | |
681 | struct fsf_qtcb_bottom_port *old) | |
1da177e4 | 682 | { |
f6cd94b1 AH |
683 | fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - |
684 | old->seconds_since_last_reset; | |
685 | fc_stats->tx_frames = data->tx_frames - old->tx_frames; | |
686 | fc_stats->tx_words = data->tx_words - old->tx_words; | |
687 | fc_stats->rx_frames = data->rx_frames - old->rx_frames; | |
688 | fc_stats->rx_words = data->rx_words - old->rx_words; | |
689 | fc_stats->lip_count = data->lip - old->lip; | |
690 | fc_stats->nos_count = data->nos - old->nos; | |
691 | fc_stats->error_frames = data->error_frames - old->error_frames; | |
692 | fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; | |
693 | fc_stats->link_failure_count = data->link_failure - old->link_failure; | |
694 | fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; | |
695 | fc_stats->loss_of_signal_count = data->loss_of_signal - | |
696 | old->loss_of_signal; | |
697 | fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - | |
698 | old->psp_error_counts; | |
699 | fc_stats->invalid_tx_word_count = data->invalid_tx_words - | |
700 | old->invalid_tx_words; | |
701 | fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; | |
702 | fc_stats->fcp_input_requests = data->input_requests - | |
703 | old->input_requests; | |
704 | fc_stats->fcp_output_requests = data->output_requests - | |
705 | old->output_requests; | |
706 | fc_stats->fcp_control_requests = data->control_requests - | |
707 | old->control_requests; | |
708 | fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; | |
709 | fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; | |
710 | } | |
1da177e4 | 711 | |
f6cd94b1 AH |
712 | static void |
713 | zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, | |
714 | struct fsf_qtcb_bottom_port *data) | |
715 | { | |
716 | fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; | |
717 | fc_stats->tx_frames = data->tx_frames; | |
718 | fc_stats->tx_words = data->tx_words; | |
719 | fc_stats->rx_frames = data->rx_frames; | |
720 | fc_stats->rx_words = data->rx_words; | |
721 | fc_stats->lip_count = data->lip; | |
722 | fc_stats->nos_count = data->nos; | |
723 | fc_stats->error_frames = data->error_frames; | |
724 | fc_stats->dumped_frames = data->dumped_frames; | |
725 | fc_stats->link_failure_count = data->link_failure; | |
726 | fc_stats->loss_of_sync_count = data->loss_of_sync; | |
727 | fc_stats->loss_of_signal_count = data->loss_of_signal; | |
728 | fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; | |
729 | fc_stats->invalid_tx_word_count = data->invalid_tx_words; | |
730 | fc_stats->invalid_crc_count = data->invalid_crcs; | |
731 | fc_stats->fcp_input_requests = data->input_requests; | |
732 | fc_stats->fcp_output_requests = data->output_requests; | |
733 | fc_stats->fcp_control_requests = data->control_requests; | |
734 | fc_stats->fcp_input_megabytes = data->input_mb; | |
735 | fc_stats->fcp_output_megabytes = data->output_mb; | |
736 | } | |
737 | ||
738 | /** | |
739 | * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc | |
740 | * | |
741 | * assumption: scsi_transport_fc synchronizes calls of | |
742 | * get_fc_host_stats and reset_fc_host_stats | |
743 | * (XXX to be checked otherwise introduce locking) | |
744 | */ | |
745 | static struct fc_host_statistics * | |
746 | zfcp_get_fc_host_stats(struct Scsi_Host *shost) | |
747 | { | |
748 | struct zfcp_adapter *adapter; | |
749 | struct fc_host_statistics *fc_stats; | |
750 | struct fsf_qtcb_bottom_port *data; | |
751 | int ret; | |
752 | ||
753 | adapter = (struct zfcp_adapter *)shost->hostdata[0]; | |
754 | fc_stats = zfcp_init_fc_host_stats(adapter); | |
755 | if (!fc_stats) | |
756 | return NULL; | |
757 | ||
ec4081c6 | 758 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
f6cd94b1 AH |
759 | if (!data) |
760 | return NULL; | |
f6cd94b1 AH |
761 | |
762 | ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); | |
763 | if (ret) { | |
764 | kfree(data); | |
765 | return NULL; /* XXX return zeroed fc_stats? */ | |
766 | } | |
767 | ||
768 | if (adapter->stats_reset && | |
769 | ((jiffies/HZ - adapter->stats_reset) < | |
770 | data->seconds_since_last_reset)) { | |
771 | zfcp_adjust_fc_host_stats(fc_stats, data, | |
772 | adapter->stats_reset_data); | |
773 | } else | |
774 | zfcp_set_fc_host_stats(fc_stats, data); | |
775 | ||
776 | kfree(data); | |
777 | return fc_stats; | |
1da177e4 LT |
778 | } |
779 | ||
780 | static void | |
f6cd94b1 | 781 | zfcp_reset_fc_host_stats(struct Scsi_Host *shost) |
1da177e4 | 782 | { |
f6cd94b1 AH |
783 | struct zfcp_adapter *adapter; |
784 | struct fsf_qtcb_bottom_port *data, *old_data; | |
785 | int ret; | |
1da177e4 | 786 | |
f6cd94b1 | 787 | adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
ec4081c6 | 788 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
f6cd94b1 AH |
789 | if (!data) |
790 | return; | |
f6cd94b1 AH |
791 | |
792 | ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); | |
793 | if (ret == 0) { | |
794 | adapter->stats_reset = jiffies/HZ; | |
795 | old_data = adapter->stats_reset_data; | |
796 | adapter->stats_reset_data = data; /* finally freed in | |
797 | adater_dequeue */ | |
798 | kfree(old_data); | |
799 | } | |
1da177e4 LT |
800 | } |
801 | ||
338151e0 AH |
802 | static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) |
803 | { | |
804 | rport->dev_loss_tmo = timeout; | |
805 | } | |
806 | ||
1da177e4 | 807 | struct fc_function_template zfcp_transport_functions = { |
1da177e4 LT |
808 | .show_starget_port_id = 1, |
809 | .show_starget_port_name = 1, | |
810 | .show_starget_node_name = 1, | |
3859f6a2 | 811 | .show_rport_supported_classes = 1, |
75bfc283 | 812 | .show_rport_maxframe_size = 1, |
338151e0 | 813 | .show_rport_dev_loss_tmo = 1, |
3859f6a2 AH |
814 | .show_host_node_name = 1, |
815 | .show_host_port_name = 1, | |
ad757cdf | 816 | .show_host_permanent_port_name = 1, |
3859f6a2 | 817 | .show_host_supported_classes = 1, |
ad757cdf | 818 | .show_host_supported_speeds = 1, |
13e1e1f0 | 819 | .show_host_maxframe_size = 1, |
3859f6a2 | 820 | .show_host_serial_number = 1, |
f6cd94b1 AH |
821 | .get_fc_host_stats = zfcp_get_fc_host_stats, |
822 | .reset_fc_host_stats = zfcp_reset_fc_host_stats, | |
338151e0 | 823 | .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, |
f6cd94b1 AH |
824 | /* no functions registered for following dynamic attributes but |
825 | directly set by LLDD */ | |
ad757cdf | 826 | .show_host_port_type = 1, |
13e1e1f0 AH |
827 | .show_host_speed = 1, |
828 | .show_host_port_id = 1, | |
1da177e4 LT |
829 | }; |
830 | ||
831 | /** | |
832 | * ZFCP_DEFINE_SCSI_ATTR | |
833 | * @_name: name of show attribute | |
834 | * @_format: format string | |
835 | * @_value: value to print | |
836 | * | |
837 | * Generates attribute for a unit. | |
838 | */ | |
839 | #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ | |
10523b3b | 840 | static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
841 | char *buf) \ |
842 | { \ | |
843 | struct scsi_device *sdev; \ | |
844 | struct zfcp_unit *unit; \ | |
845 | \ | |
846 | sdev = to_scsi_device(dev); \ | |
847 | unit = sdev->hostdata; \ | |
848 | return sprintf(buf, _format, _value); \ | |
849 | } \ | |
850 | \ | |
851 | static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); | |
852 | ||
853 | ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); | |
854 | ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); | |
855 | ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); | |
856 | ||
857 | static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { | |
858 | &dev_attr_fcp_lun, | |
859 | &dev_attr_wwpn, | |
860 | &dev_attr_hba_id, | |
861 | NULL | |
862 | }; | |
863 | ||
864 | #undef ZFCP_LOG_AREA |