Commit | Line | Data |
---|---|---|
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 | 24 | #include "zfcp_ext.h" |
5f852be9 | 25 | #include <asm/atomic.h> |
1da177e4 LT |
26 | |
27 | static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); | |
28 | static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); | |
29 | static int zfcp_scsi_slave_configure(struct scsi_device *sdp); | |
30 | static int zfcp_scsi_queuecommand(struct scsi_cmnd *, | |
31 | void (*done) (struct scsi_cmnd *)); | |
32 | static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); | |
33 | static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); | |
1da177e4 | 34 | static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); |
8a36e453 MS |
35 | static int zfcp_task_management_function(struct zfcp_unit *, u8, |
36 | struct scsi_cmnd *); | |
1da177e4 | 37 | |
06506d00 AH |
38 | static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, |
39 | unsigned int, unsigned int); | |
1da177e4 LT |
40 | |
41 | static struct device_attribute *zfcp_sysfs_sdev_attrs[]; | |
42 | ||
1da177e4 LT |
43 | struct zfcp_data zfcp_data = { |
44 | .scsi_host_template = { | |
d2c993d8 | 45 | .name = ZFCP_NAME, |
dd52e0ea | 46 | .module = THIS_MODULE, |
d2c993d8 | 47 | .proc_name = "zfcp", |
d2c993d8 HC |
48 | .slave_alloc = zfcp_scsi_slave_alloc, |
49 | .slave_configure = zfcp_scsi_slave_configure, | |
50 | .slave_destroy = zfcp_scsi_slave_destroy, | |
51 | .queuecommand = zfcp_scsi_queuecommand, | |
52 | .eh_abort_handler = zfcp_scsi_eh_abort_handler, | |
53 | .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, | |
f6c0e7a7 | 54 | .eh_bus_reset_handler = zfcp_scsi_eh_host_reset_handler, |
d2c993d8 HC |
55 | .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, |
56 | .can_queue = 4096, | |
57 | .this_id = -1, | |
d2c993d8 HC |
58 | .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, |
59 | .cmd_per_lun = 1, | |
d2c993d8 HC |
60 | .use_clustering = 1, |
61 | .sdev_attrs = zfcp_sysfs_sdev_attrs, | |
8d1a0060 | 62 | .max_sectors = ZFCP_MAX_SECTORS, |
1da177e4 LT |
63 | }, |
64 | .driver_version = ZFCP_VERSION, | |
1da177e4 LT |
65 | }; |
66 | ||
67 | /* Find start of Response Information in FCP response unit*/ | |
68 | char * | |
69 | zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) | |
70 | { | |
71 | char *fcp_rsp_info_ptr; | |
72 | ||
73 | fcp_rsp_info_ptr = | |
74 | (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); | |
75 | ||
76 | return fcp_rsp_info_ptr; | |
77 | } | |
78 | ||
79 | /* Find start of Sense Information in FCP response unit*/ | |
80 | char * | |
81 | zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) | |
82 | { | |
83 | char *fcp_sns_info_ptr; | |
84 | ||
85 | fcp_sns_info_ptr = | |
86 | (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); | |
87 | if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) | |
88 | fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + | |
89 | fcp_rsp_iu->fcp_rsp_len; | |
90 | ||
91 | return fcp_sns_info_ptr; | |
92 | } | |
93 | ||
2b67fc46 | 94 | static fcp_dl_t * |
1da177e4 LT |
95 | zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) |
96 | { | |
97 | int additional_length = fcp_cmd->add_fcp_cdb_length << 2; | |
98 | fcp_dl_t *fcp_dl_addr; | |
99 | ||
100 | fcp_dl_addr = (fcp_dl_t *) | |
101 | ((unsigned char *) fcp_cmd + | |
102 | sizeof (struct fcp_cmnd_iu) + additional_length); | |
103 | /* | |
104 | * fcp_dl_addr = start address of fcp_cmnd structure + | |
105 | * size of fixed part + size of dynamically sized add_dcp_cdb field | |
106 | * SEE FCP-2 documentation | |
107 | */ | |
108 | return fcp_dl_addr; | |
109 | } | |
110 | ||
111 | fcp_dl_t | |
112 | zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) | |
113 | { | |
114 | return *zfcp_get_fcp_dl_ptr(fcp_cmd); | |
115 | } | |
116 | ||
117 | void | |
118 | zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) | |
119 | { | |
120 | *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; | |
121 | } | |
122 | ||
123 | /* | |
124 | * note: it's a bit-or operation not an assignment | |
125 | * regarding the specified byte | |
126 | */ | |
127 | static inline void | |
2b67fc46 | 128 | set_byte(int *result, char status, char pos) |
1da177e4 LT |
129 | { |
130 | *result |= status << (pos * 8); | |
131 | } | |
132 | ||
133 | void | |
2b67fc46 | 134 | set_host_byte(int *result, char status) |
1da177e4 LT |
135 | { |
136 | set_byte(result, status, 2); | |
137 | } | |
138 | ||
139 | void | |
2b67fc46 | 140 | set_driver_byte(int *result, char status) |
1da177e4 LT |
141 | { |
142 | set_byte(result, status, 3); | |
143 | } | |
144 | ||
1da177e4 LT |
145 | static int |
146 | zfcp_scsi_slave_alloc(struct scsi_device *sdp) | |
147 | { | |
148 | struct zfcp_adapter *adapter; | |
149 | struct zfcp_unit *unit; | |
150 | unsigned long flags; | |
fb121b06 | 151 | int retval = -ENXIO; |
1da177e4 LT |
152 | |
153 | adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; | |
154 | if (!adapter) | |
155 | goto out; | |
156 | ||
157 | read_lock_irqsave(&zfcp_data.config_lock, flags); | |
158 | unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); | |
ad58f7db AH |
159 | if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED, |
160 | &unit->status)) { | |
1da177e4 LT |
161 | sdp->hostdata = unit; |
162 | unit->device = sdp; | |
163 | zfcp_unit_get(unit); | |
164 | retval = 0; | |
165 | } | |
166 | read_unlock_irqrestore(&zfcp_data.config_lock, flags); | |
167 | out: | |
168 | return retval; | |
169 | } | |
170 | ||
f6c0e7a7 AH |
171 | /** |
172 | * zfcp_scsi_slave_destroy - called when scsi device is removed | |
173 | * | |
174 | * Remove reference to associated scsi device for an zfcp_unit. | |
175 | * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs | |
176 | * or a scan for this device might have failed. | |
177 | */ | |
178 | static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) | |
1da177e4 LT |
179 | { |
180 | struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; | |
181 | ||
182 | if (unit) { | |
5f852be9 CS |
183 | zfcp_erp_wait(unit->port->adapter); |
184 | wait_event(unit->scsi_scan_wq, | |
185 | atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, | |
186 | &unit->status) == 0); | |
ad58f7db | 187 | atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); |
1da177e4 LT |
188 | sdpnt->hostdata = NULL; |
189 | unit->device = NULL; | |
f6c0e7a7 | 190 | zfcp_erp_unit_failed(unit); |
1da177e4 LT |
191 | zfcp_unit_put(unit); |
192 | } else { | |
193 | ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " | |
194 | "address %p\n", sdpnt); | |
195 | } | |
196 | } | |
197 | ||
198 | /* | |
199 | * called from scsi midlayer to allow finetuning of a device. | |
200 | */ | |
201 | static int | |
202 | zfcp_scsi_slave_configure(struct scsi_device *sdp) | |
203 | { | |
204 | if (sdp->tagged_supported) | |
205 | scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); | |
206 | else | |
207 | scsi_adjust_queue_depth(sdp, 0, 1); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | /** | |
212 | * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function | |
213 | * @scpnt: pointer to struct scsi_cmnd where result is set | |
214 | * @result: result to be set in scpnt (e.g. DID_ERROR) | |
215 | */ | |
216 | static void | |
217 | zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) | |
218 | { | |
219 | set_host_byte(&scpnt->result, result); | |
8a36e453 MS |
220 | if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) |
221 | zfcp_scsi_dbf_event_result("fail", 4, | |
222 | (struct zfcp_adapter*) scpnt->device->host->hostdata[0], | |
ed829ad6 | 223 | scpnt, NULL); |
1da177e4 LT |
224 | /* return directly */ |
225 | scpnt->scsi_done(scpnt); | |
226 | } | |
227 | ||
228 | /** | |
229 | * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and | |
230 | * zfcp_scsi_command_sync | |
231 | * @adapter: adapter where scsi command is issued | |
232 | * @unit: unit to which scsi command is sent | |
233 | * @scpnt: scsi command to be sent | |
234 | * @timer: timer to be started if request is successfully initiated | |
235 | * | |
236 | * Note: In scsi_done function must be set in scpnt. | |
237 | */ | |
238 | int | |
239 | zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, | |
2abbe866 | 240 | struct scsi_cmnd *scpnt, int use_timer) |
1da177e4 LT |
241 | { |
242 | int tmp; | |
243 | int retval; | |
244 | ||
245 | retval = 0; | |
246 | ||
247 | BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); | |
248 | BUG_ON(scpnt->scsi_done == NULL); | |
249 | ||
250 | if (unlikely(NULL == unit)) { | |
251 | zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); | |
252 | goto out; | |
253 | } | |
254 | ||
255 | if (unlikely( | |
256 | atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || | |
257 | !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { | |
258 | ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " | |
259 | "0x%016Lx on adapter %s\n", | |
260 | unit->fcp_lun, unit->port->wwpn, | |
261 | zfcp_get_busid_by_adapter(adapter)); | |
262 | zfcp_scsi_command_fail(scpnt, DID_ERROR); | |
263 | goto out; | |
264 | } | |
265 | ||
266 | if (unlikely( | |
267 | !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { | |
268 | ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " | |
269 | "on port 0x%016Lx in recovery\n", | |
270 | zfcp_get_busid_by_unit(unit), | |
271 | unit->fcp_lun, unit->port->wwpn); | |
ad58f7db | 272 | zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); |
1da177e4 LT |
273 | goto out; |
274 | } | |
275 | ||
2abbe866 | 276 | tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer, |
1da177e4 LT |
277 | ZFCP_REQ_AUTO_CLEANUP); |
278 | ||
279 | if (unlikely(tmp < 0)) { | |
280 | ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); | |
281 | retval = SCSI_MLQUEUE_HOST_BUSY; | |
282 | } | |
283 | ||
284 | out: | |
285 | return retval; | |
286 | } | |
287 | ||
2b67fc46 | 288 | static void |
1da177e4 LT |
289 | zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) |
290 | { | |
291 | struct completion *wait = (struct completion *) scpnt->SCp.ptr; | |
292 | complete(wait); | |
293 | } | |
294 | ||
295 | ||
296 | /** | |
297 | * zfcp_scsi_command_sync - send a SCSI command and wait for completion | |
298 | * @unit: unit where command is sent to | |
299 | * @scpnt: scsi command to be sent | |
2abbe866 | 300 | * @use_timer: indicates whether timer should be setup or not |
1da177e4 LT |
301 | * Return: 0 |
302 | * | |
303 | * Errors are indicated in scpnt->result | |
304 | */ | |
305 | int | |
306 | zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, | |
2abbe866 | 307 | int use_timer) |
1da177e4 LT |
308 | { |
309 | int ret; | |
6e9a4738 | 310 | DECLARE_COMPLETION_ONSTACK(wait); |
1da177e4 LT |
311 | |
312 | scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ | |
313 | scpnt->scsi_done = zfcp_scsi_command_sync_handler; | |
2abbe866 AH |
314 | ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, |
315 | use_timer); | |
1da177e4 LT |
316 | if (ret == 0) |
317 | wait_for_completion(&wait); | |
318 | ||
319 | scpnt->SCp.ptr = NULL; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | /* | |
325 | * function: zfcp_scsi_queuecommand | |
326 | * | |
327 | * purpose: enqueues a SCSI command to the specified target device | |
328 | * | |
329 | * returns: 0 - success, SCSI command enqueued | |
330 | * !0 - failure | |
331 | */ | |
2b67fc46 | 332 | static int |
1da177e4 LT |
333 | zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, |
334 | void (*done) (struct scsi_cmnd *)) | |
335 | { | |
336 | struct zfcp_unit *unit; | |
337 | struct zfcp_adapter *adapter; | |
338 | ||
339 | /* reset the status for this request */ | |
340 | scpnt->result = 0; | |
341 | scpnt->host_scribble = NULL; | |
342 | scpnt->scsi_done = done; | |
343 | ||
344 | /* | |
345 | * figure out adapter and target device | |
346 | * (stored there by zfcp_scsi_slave_alloc) | |
347 | */ | |
348 | adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; | |
349 | unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
350 | ||
2abbe866 | 351 | return zfcp_scsi_command_async(adapter, unit, scpnt, 0); |
1da177e4 LT |
352 | } |
353 | ||
1da177e4 | 354 | static struct zfcp_unit * |
06506d00 AH |
355 | zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id, |
356 | unsigned int lun) | |
1da177e4 LT |
357 | { |
358 | struct zfcp_port *port; | |
359 | struct zfcp_unit *unit, *retval = NULL; | |
360 | ||
361 | list_for_each_entry(port, &adapter->port_list_head, list) { | |
3859f6a2 | 362 | if (!port->rport || (id != port->rport->scsi_target_id)) |
1da177e4 LT |
363 | continue; |
364 | list_for_each_entry(unit, &port->unit_list_head, list) { | |
365 | if (lun == unit->scsi_lun) { | |
366 | retval = unit; | |
367 | goto out; | |
368 | } | |
369 | } | |
370 | } | |
371 | out: | |
372 | return retval; | |
373 | } | |
374 | ||
059c97d0 AH |
375 | /** |
376 | * zfcp_scsi_eh_abort_handler - abort the specified SCSI command | |
377 | * @scpnt: pointer to scsi_cmnd to be aborted | |
378 | * Return: SUCCESS - command has been aborted and cleaned up in internal | |
379 | * bookkeeping, SCSI stack won't be called for aborted command | |
380 | * FAILED - otherwise | |
1da177e4 | 381 | * |
059c97d0 AH |
382 | * We do not need to care for a SCSI command which completes normally |
383 | * but late during this abort routine runs. We are allowed to return | |
384 | * late commands to the SCSI stack. It tracks the state of commands and | |
385 | * will handle late commands. (Usually, the normal completion of late | |
386 | * commands is ignored with respect to the running abort operation.) | |
1da177e4 | 387 | */ |
2b67fc46 | 388 | static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) |
1da177e4 | 389 | { |
059c97d0 AH |
390 | struct Scsi_Host *scsi_host; |
391 | struct zfcp_adapter *adapter; | |
392 | struct zfcp_unit *unit; | |
4eff4a36 | 393 | struct zfcp_fsf_req *fsf_req; |
1da177e4 | 394 | unsigned long flags; |
4eff4a36 AH |
395 | unsigned long old_req_id; |
396 | int retval = SUCCESS; | |
059c97d0 AH |
397 | |
398 | scsi_host = scpnt->device->host; | |
399 | adapter = (struct zfcp_adapter *) scsi_host->hostdata[0]; | |
400 | unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
1da177e4 LT |
401 | |
402 | ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", | |
403 | scpnt, zfcp_get_busid_by_adapter(adapter)); | |
404 | ||
059c97d0 | 405 | /* avoid race condition between late normal completion and abort */ |
1da177e4 LT |
406 | write_lock_irqsave(&adapter->abort_lock, flags); |
407 | ||
4eff4a36 AH |
408 | /* Check whether corresponding fsf_req is still pending */ |
409 | spin_lock(&adapter->req_list_lock); | |
ca2d02c2 HC |
410 | fsf_req = zfcp_reqlist_find(adapter, |
411 | (unsigned long) scpnt->host_scribble); | |
4eff4a36 AH |
412 | spin_unlock(&adapter->req_list_lock); |
413 | if (!fsf_req) { | |
1da177e4 | 414 | write_unlock_irqrestore(&adapter->abort_lock, flags); |
4eff4a36 | 415 | zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0); |
8a36e453 | 416 | retval = SUCCESS; |
1da177e4 LT |
417 | goto out; |
418 | } | |
4eff4a36 AH |
419 | fsf_req->data = 0; |
420 | fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; | |
421 | old_req_id = fsf_req->req_id; | |
1da177e4 | 422 | |
4eff4a36 | 423 | /* don't access old fsf_req after releasing the abort_lock */ |
1da177e4 | 424 | write_unlock_irqrestore(&adapter->abort_lock, flags); |
4eff4a36 AH |
425 | |
426 | fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0); | |
427 | if (!fsf_req) { | |
8a36e453 | 428 | ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n"); |
ed829ad6 | 429 | zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL, |
4eff4a36 | 430 | old_req_id); |
1da177e4 | 431 | retval = FAILED; |
1da177e4 LT |
432 | goto out; |
433 | } | |
434 | ||
4eff4a36 AH |
435 | __wait_event(fsf_req->completion_wq, |
436 | fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); | |
059c97d0 | 437 | |
4eff4a36 AH |
438 | if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { |
439 | zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0); | |
1da177e4 | 440 | retval = SUCCESS; |
4eff4a36 AH |
441 | } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { |
442 | zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0); | |
1da177e4 | 443 | retval = SUCCESS; |
1da177e4 | 444 | } else { |
4eff4a36 | 445 | zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0); |
1da177e4 | 446 | retval = FAILED; |
1da177e4 | 447 | } |
4eff4a36 | 448 | zfcp_fsf_req_free(fsf_req); |
1da177e4 | 449 | out: |
1da177e4 LT |
450 | return retval; |
451 | } | |
452 | ||
2b67fc46 | 453 | static int |
1da177e4 LT |
454 | zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) |
455 | { | |
456 | int retval; | |
457 | struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; | |
1da177e4 | 458 | |
1da177e4 LT |
459 | if (!unit) { |
460 | ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); | |
461 | retval = SUCCESS; | |
462 | goto out; | |
463 | } | |
464 | ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); | |
465 | ||
466 | /* | |
467 | * If we do not know whether the unit supports 'logical unit reset' | |
468 | * then try 'logical unit reset' and proceed with 'target reset' | |
469 | * if 'logical unit reset' fails. | |
470 | * If the unit is known not to support 'logical unit reset' then | |
471 | * skip 'logical unit reset' and try 'target reset' immediately. | |
472 | */ | |
473 | if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, | |
474 | &unit->status)) { | |
8a36e453 MS |
475 | retval = zfcp_task_management_function(unit, |
476 | FCP_LOGICAL_UNIT_RESET, | |
477 | scpnt); | |
1da177e4 LT |
478 | if (retval) { |
479 | ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); | |
480 | if (retval == -ENOTSUPP) | |
481 | atomic_set_mask | |
482 | (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, | |
483 | &unit->status); | |
484 | /* fall through and try 'target reset' next */ | |
485 | } else { | |
486 | ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", | |
487 | unit); | |
488 | /* avoid 'target reset' */ | |
489 | retval = SUCCESS; | |
490 | goto out; | |
491 | } | |
492 | } | |
8a36e453 | 493 | retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt); |
1da177e4 LT |
494 | if (retval) { |
495 | ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); | |
496 | retval = FAILED; | |
497 | } else { | |
498 | ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); | |
499 | retval = SUCCESS; | |
500 | } | |
501 | out: | |
1da177e4 LT |
502 | return retval; |
503 | } | |
504 | ||
505 | static int | |
8a36e453 MS |
506 | zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, |
507 | struct scsi_cmnd *scpnt) | |
1da177e4 LT |
508 | { |
509 | struct zfcp_adapter *adapter = unit->port->adapter; | |
1da177e4 | 510 | struct zfcp_fsf_req *fsf_req; |
77eb1699 | 511 | int retval = 0; |
1da177e4 LT |
512 | |
513 | /* issue task management function */ | |
514 | fsf_req = zfcp_fsf_send_fcp_command_task_management | |
515 | (adapter, unit, tm_flags, 0); | |
516 | if (!fsf_req) { | |
517 | ZFCP_LOG_INFO("error: creation of task management request " | |
518 | "failed for unit 0x%016Lx on port 0x%016Lx on " | |
519 | "adapter %s\n", unit->fcp_lun, unit->port->wwpn, | |
520 | zfcp_get_busid_by_adapter(adapter)); | |
8a36e453 | 521 | zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt); |
1da177e4 LT |
522 | retval = -ENOMEM; |
523 | goto out; | |
524 | } | |
525 | ||
77eb1699 AH |
526 | __wait_event(fsf_req->completion_wq, |
527 | fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); | |
528 | ||
8a36e453 MS |
529 | /* |
530 | * check completion status of task management function | |
531 | */ | |
532 | if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { | |
533 | zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt); | |
1da177e4 | 534 | retval = -EIO; |
8a36e453 MS |
535 | } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) { |
536 | zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt); | |
1da177e4 | 537 | retval = -ENOTSUPP; |
8a36e453 MS |
538 | } else |
539 | zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt); | |
77eb1699 AH |
540 | |
541 | zfcp_fsf_req_free(fsf_req); | |
1da177e4 LT |
542 | out: |
543 | return retval; | |
544 | } | |
545 | ||
810f1e3e | 546 | /** |
f6c0e7a7 | 547 | * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset |
1da177e4 | 548 | */ |
2b67fc46 | 549 | static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) |
1da177e4 | 550 | { |
f6c0e7a7 AH |
551 | struct zfcp_unit *unit; |
552 | struct zfcp_adapter *adapter; | |
1da177e4 | 553 | |
f6c0e7a7 AH |
554 | unit = (struct zfcp_unit*) scpnt->device->hostdata; |
555 | adapter = unit->port->adapter; | |
1da177e4 | 556 | |
f6c0e7a7 | 557 | ZFCP_LOG_NORMAL("host/bus reset because of problems with " |
1da177e4 | 558 | "unit 0x%016Lx\n", unit->fcp_lun); |
f6c0e7a7 | 559 | |
81654286 AH |
560 | zfcp_erp_adapter_reopen(adapter, 0); |
561 | zfcp_erp_wait(adapter); | |
1da177e4 | 562 | |
810f1e3e | 563 | return SUCCESS; |
1da177e4 LT |
564 | } |
565 | ||
1da177e4 LT |
566 | int |
567 | zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) | |
568 | { | |
569 | int retval = 0; | |
570 | static unsigned int unique_id = 0; | |
571 | ||
9f28745a ML |
572 | if (adapter->scsi_host) |
573 | goto out; | |
574 | ||
1da177e4 LT |
575 | /* register adapter as SCSI host with mid layer of SCSI stack */ |
576 | adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, | |
577 | sizeof (struct zfcp_adapter *)); | |
578 | if (!adapter->scsi_host) { | |
579 | ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " | |
580 | "for adapter %s ", | |
581 | zfcp_get_busid_by_adapter(adapter)); | |
582 | retval = -EIO; | |
583 | goto out; | |
584 | } | |
585 | ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); | |
586 | ||
587 | /* tell the SCSI stack some characteristics of this adapter */ | |
588 | adapter->scsi_host->max_id = 1; | |
589 | adapter->scsi_host->max_lun = 1; | |
590 | adapter->scsi_host->max_channel = 0; | |
591 | adapter->scsi_host->unique_id = unique_id++; /* FIXME */ | |
592 | adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; | |
dd52e0ea | 593 | adapter->scsi_host->transportt = zfcp_data.scsi_transport_template; |
1da177e4 LT |
594 | |
595 | /* | |
596 | * save a pointer to our own adapter data structure within | |
597 | * hostdata field of SCSI host data structure | |
598 | */ | |
599 | adapter->scsi_host->hostdata[0] = (unsigned long) adapter; | |
600 | ||
601 | if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { | |
602 | scsi_host_put(adapter->scsi_host); | |
603 | retval = -EIO; | |
604 | goto out; | |
605 | } | |
606 | atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); | |
607 | out: | |
608 | return retval; | |
609 | } | |
610 | ||
1da177e4 LT |
611 | void |
612 | zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) | |
613 | { | |
614 | struct Scsi_Host *shost; | |
13e1e1f0 | 615 | struct zfcp_port *port; |
1da177e4 LT |
616 | |
617 | shost = adapter->scsi_host; | |
618 | if (!shost) | |
619 | return; | |
13e1e1f0 AH |
620 | read_lock_irq(&zfcp_data.config_lock); |
621 | list_for_each_entry(port, &adapter->port_list_head, list) | |
622 | if (port->rport) | |
623 | port->rport = NULL; | |
624 | read_unlock_irq(&zfcp_data.config_lock); | |
3859f6a2 | 625 | fc_remove_host(shost); |
1da177e4 LT |
626 | scsi_remove_host(shost); |
627 | scsi_host_put(shost); | |
628 | adapter->scsi_host = NULL; | |
1da177e4 LT |
629 | atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); |
630 | ||
631 | return; | |
632 | } | |
633 | ||
1da177e4 LT |
634 | /* |
635 | * Support functions for FC transport class | |
636 | */ | |
f6cd94b1 AH |
637 | static struct fc_host_statistics* |
638 | zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) | |
1da177e4 | 639 | { |
f6cd94b1 | 640 | struct fc_host_statistics *fc_stats; |
1da177e4 | 641 | |
f6cd94b1 AH |
642 | if (!adapter->fc_stats) { |
643 | fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); | |
644 | if (!fc_stats) | |
645 | return NULL; | |
646 | adapter->fc_stats = fc_stats; /* freed in adater_dequeue */ | |
647 | } | |
648 | memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); | |
649 | return adapter->fc_stats; | |
1da177e4 LT |
650 | } |
651 | ||
652 | static void | |
f6cd94b1 AH |
653 | zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, |
654 | struct fsf_qtcb_bottom_port *data, | |
655 | struct fsf_qtcb_bottom_port *old) | |
1da177e4 | 656 | { |
f6cd94b1 AH |
657 | fc_stats->seconds_since_last_reset = data->seconds_since_last_reset - |
658 | old->seconds_since_last_reset; | |
659 | fc_stats->tx_frames = data->tx_frames - old->tx_frames; | |
660 | fc_stats->tx_words = data->tx_words - old->tx_words; | |
661 | fc_stats->rx_frames = data->rx_frames - old->rx_frames; | |
662 | fc_stats->rx_words = data->rx_words - old->rx_words; | |
663 | fc_stats->lip_count = data->lip - old->lip; | |
664 | fc_stats->nos_count = data->nos - old->nos; | |
665 | fc_stats->error_frames = data->error_frames - old->error_frames; | |
666 | fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; | |
667 | fc_stats->link_failure_count = data->link_failure - old->link_failure; | |
668 | fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; | |
669 | fc_stats->loss_of_signal_count = data->loss_of_signal - | |
670 | old->loss_of_signal; | |
671 | fc_stats->prim_seq_protocol_err_count = data->psp_error_counts - | |
672 | old->psp_error_counts; | |
673 | fc_stats->invalid_tx_word_count = data->invalid_tx_words - | |
674 | old->invalid_tx_words; | |
675 | fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; | |
676 | fc_stats->fcp_input_requests = data->input_requests - | |
677 | old->input_requests; | |
678 | fc_stats->fcp_output_requests = data->output_requests - | |
679 | old->output_requests; | |
680 | fc_stats->fcp_control_requests = data->control_requests - | |
681 | old->control_requests; | |
682 | fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; | |
683 | fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; | |
684 | } | |
1da177e4 | 685 | |
f6cd94b1 AH |
686 | static void |
687 | zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, | |
688 | struct fsf_qtcb_bottom_port *data) | |
689 | { | |
690 | fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; | |
691 | fc_stats->tx_frames = data->tx_frames; | |
692 | fc_stats->tx_words = data->tx_words; | |
693 | fc_stats->rx_frames = data->rx_frames; | |
694 | fc_stats->rx_words = data->rx_words; | |
695 | fc_stats->lip_count = data->lip; | |
696 | fc_stats->nos_count = data->nos; | |
697 | fc_stats->error_frames = data->error_frames; | |
698 | fc_stats->dumped_frames = data->dumped_frames; | |
699 | fc_stats->link_failure_count = data->link_failure; | |
700 | fc_stats->loss_of_sync_count = data->loss_of_sync; | |
701 | fc_stats->loss_of_signal_count = data->loss_of_signal; | |
702 | fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; | |
703 | fc_stats->invalid_tx_word_count = data->invalid_tx_words; | |
704 | fc_stats->invalid_crc_count = data->invalid_crcs; | |
705 | fc_stats->fcp_input_requests = data->input_requests; | |
706 | fc_stats->fcp_output_requests = data->output_requests; | |
707 | fc_stats->fcp_control_requests = data->control_requests; | |
708 | fc_stats->fcp_input_megabytes = data->input_mb; | |
709 | fc_stats->fcp_output_megabytes = data->output_mb; | |
710 | } | |
711 | ||
712 | /** | |
713 | * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc | |
714 | * | |
715 | * assumption: scsi_transport_fc synchronizes calls of | |
716 | * get_fc_host_stats and reset_fc_host_stats | |
717 | * (XXX to be checked otherwise introduce locking) | |
718 | */ | |
719 | static struct fc_host_statistics * | |
720 | zfcp_get_fc_host_stats(struct Scsi_Host *shost) | |
721 | { | |
722 | struct zfcp_adapter *adapter; | |
723 | struct fc_host_statistics *fc_stats; | |
724 | struct fsf_qtcb_bottom_port *data; | |
725 | int ret; | |
726 | ||
727 | adapter = (struct zfcp_adapter *)shost->hostdata[0]; | |
728 | fc_stats = zfcp_init_fc_host_stats(adapter); | |
729 | if (!fc_stats) | |
730 | return NULL; | |
731 | ||
ec4081c6 | 732 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
f6cd94b1 AH |
733 | if (!data) |
734 | return NULL; | |
f6cd94b1 AH |
735 | |
736 | ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); | |
737 | if (ret) { | |
738 | kfree(data); | |
739 | return NULL; /* XXX return zeroed fc_stats? */ | |
740 | } | |
741 | ||
742 | if (adapter->stats_reset && | |
743 | ((jiffies/HZ - adapter->stats_reset) < | |
744 | data->seconds_since_last_reset)) { | |
745 | zfcp_adjust_fc_host_stats(fc_stats, data, | |
746 | adapter->stats_reset_data); | |
747 | } else | |
748 | zfcp_set_fc_host_stats(fc_stats, data); | |
749 | ||
750 | kfree(data); | |
751 | return fc_stats; | |
1da177e4 LT |
752 | } |
753 | ||
754 | static void | |
f6cd94b1 | 755 | zfcp_reset_fc_host_stats(struct Scsi_Host *shost) |
1da177e4 | 756 | { |
f6cd94b1 AH |
757 | struct zfcp_adapter *adapter; |
758 | struct fsf_qtcb_bottom_port *data, *old_data; | |
759 | int ret; | |
1da177e4 | 760 | |
f6cd94b1 | 761 | adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
ec4081c6 | 762 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
f6cd94b1 AH |
763 | if (!data) |
764 | return; | |
f6cd94b1 AH |
765 | |
766 | ret = zfcp_fsf_exchange_port_data(NULL, adapter, data); | |
767 | if (ret == 0) { | |
768 | adapter->stats_reset = jiffies/HZ; | |
769 | old_data = adapter->stats_reset_data; | |
770 | adapter->stats_reset_data = data; /* finally freed in | |
771 | adater_dequeue */ | |
772 | kfree(old_data); | |
773 | } | |
1da177e4 LT |
774 | } |
775 | ||
338151e0 AH |
776 | static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) |
777 | { | |
778 | rport->dev_loss_tmo = timeout; | |
779 | } | |
780 | ||
1da177e4 | 781 | struct fc_function_template zfcp_transport_functions = { |
1da177e4 LT |
782 | .show_starget_port_id = 1, |
783 | .show_starget_port_name = 1, | |
784 | .show_starget_node_name = 1, | |
3859f6a2 | 785 | .show_rport_supported_classes = 1, |
75bfc283 | 786 | .show_rport_maxframe_size = 1, |
338151e0 | 787 | .show_rport_dev_loss_tmo = 1, |
3859f6a2 AH |
788 | .show_host_node_name = 1, |
789 | .show_host_port_name = 1, | |
ad757cdf | 790 | .show_host_permanent_port_name = 1, |
3859f6a2 | 791 | .show_host_supported_classes = 1, |
ad757cdf | 792 | .show_host_supported_speeds = 1, |
13e1e1f0 | 793 | .show_host_maxframe_size = 1, |
3859f6a2 | 794 | .show_host_serial_number = 1, |
f6cd94b1 AH |
795 | .get_fc_host_stats = zfcp_get_fc_host_stats, |
796 | .reset_fc_host_stats = zfcp_reset_fc_host_stats, | |
338151e0 | 797 | .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, |
f6cd94b1 AH |
798 | /* no functions registered for following dynamic attributes but |
799 | directly set by LLDD */ | |
ad757cdf | 800 | .show_host_port_type = 1, |
13e1e1f0 AH |
801 | .show_host_speed = 1, |
802 | .show_host_port_id = 1, | |
1da177e4 LT |
803 | }; |
804 | ||
805 | /** | |
806 | * ZFCP_DEFINE_SCSI_ATTR | |
807 | * @_name: name of show attribute | |
808 | * @_format: format string | |
809 | * @_value: value to print | |
810 | * | |
811 | * Generates attribute for a unit. | |
812 | */ | |
813 | #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ | |
10523b3b | 814 | static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \ |
1da177e4 LT |
815 | char *buf) \ |
816 | { \ | |
817 | struct scsi_device *sdev; \ | |
818 | struct zfcp_unit *unit; \ | |
819 | \ | |
820 | sdev = to_scsi_device(dev); \ | |
821 | unit = sdev->hostdata; \ | |
822 | return sprintf(buf, _format, _value); \ | |
823 | } \ | |
824 | \ | |
825 | static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); | |
826 | ||
827 | ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); | |
828 | ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); | |
829 | ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); | |
830 | ||
831 | static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { | |
832 | &dev_attr_fcp_lun, | |
833 | &dev_attr_wwpn, | |
834 | &dev_attr_hba_id, | |
835 | NULL | |
836 | }; | |
837 | ||
838 | #undef ZFCP_LOG_AREA |