?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / scsi / ibmvscsi / ibmvfc.c
blob23f5ba5e6472581d4aa69bef39d1ca25992502d4
1 /*
2 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
3 *
4 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
5 *
6 * Copyright (C) IBM Corporation, 2008
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/dmapool.h>
28 #include <linux/delay.h>
29 #include <linux/interrupt.h>
30 #include <linux/kthread.h>
31 #include <linux/slab.h>
32 #include <linux/of.h>
33 #include <linux/pm.h>
34 #include <linux/stringify.h>
35 #include <asm/firmware.h>
36 #include <asm/irq.h>
37 #include <asm/vio.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_tcq.h>
43 #include <scsi/scsi_transport_fc.h>
44 #include <scsi/scsi_bsg_fc.h>
45 #include "ibmvfc.h"
46
47 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
48 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
49 static unsigned int max_lun = IBMVFC_MAX_LUN;
50 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
51 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
52 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
53 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
54 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
55 static LIST_HEAD(ibmvfc_head);
56 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
57 static struct scsi_transport_template *ibmvfc_transport_template;
58
59 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
60 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
61 MODULE_LICENSE("GPL");
62 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
63
64 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
65 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
66 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
67 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
68 MODULE_PARM_DESC(default_timeout,
69 "Default timeout in seconds for initialization and EH commands. "
70 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
71 module_param_named(max_requests, max_requests, uint, S_IRUGO);
72 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
73 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
74 module_param_named(max_lun, max_lun, uint, S_IRUGO);
75 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
76 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
77 module_param_named(max_targets, max_targets, uint, S_IRUGO);
78 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
79 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
80 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
81 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
82 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
83 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
84 MODULE_PARM_DESC(debug, "Enable driver debug information. "
85 "[Default=" __stringify(IBMVFC_DEBUG) "]");
86 module_param_named(log_level, log_level, uint, 0);
87 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
88 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
89
90 static const struct {
91 u16 status;
92 u16 error;
93 u8 result;
94 u8 retry;
95 int log;
96 char *name;
97 } cmd_status [] = {
98 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
99 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
100 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
101 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
102 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
103 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
104 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
105 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
106 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
107 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
108 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
109 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
110 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
111 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
112
113 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
114 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
115 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
116 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
117 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
118 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
119 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
120 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
121 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
122 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
123
124 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
125 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
126 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
127 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
128 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
129 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
130 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
131 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
132 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
133 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
134 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
135
136 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
137 };
138
139 static void ibmvfc_npiv_login(struct ibmvfc_host *);
140 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
141 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
142 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
143 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
144
145 static const char *unknown_error = "unknown error";
146
147 #ifdef CONFIG_SCSI_IBMVFC_TRACE
148 /**
149 * ibmvfc_trc_start - Log a start trace entry
150 * @evt: ibmvfc event struct
151 *
152 **/
153 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
154 {
155 struct ibmvfc_host *vhost = evt->vhost;
156 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
157 struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
158 struct ibmvfc_trace_entry *entry;
159
160 entry = &vhost->trace[vhost->trace_index++];
161 entry->evt = evt;
162 entry->time = jiffies;
163 entry->fmt = evt->crq.format;
164 entry->type = IBMVFC_TRC_START;
165
166 switch (entry->fmt) {
167 case IBMVFC_CMD_FORMAT:
168 entry->op_code = vfc_cmd->iu.cdb[0];
169 entry->scsi_id = vfc_cmd->tgt_scsi_id;
170 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
171 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
172 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
173 break;
174 case IBMVFC_MAD_FORMAT:
175 entry->op_code = mad->opcode;
176 break;
177 default:
178 break;
179 };
180 }
181
182 /**
183 * ibmvfc_trc_end - Log an end trace entry
184 * @evt: ibmvfc event struct
185 *
186 **/
187 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
188 {
189 struct ibmvfc_host *vhost = evt->vhost;
190 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
191 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
192 struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
193
194 entry->evt = evt;
195 entry->time = jiffies;
196 entry->fmt = evt->crq.format;
197 entry->type = IBMVFC_TRC_END;
198
199 switch (entry->fmt) {
200 case IBMVFC_CMD_FORMAT:
201 entry->op_code = vfc_cmd->iu.cdb[0];
202 entry->scsi_id = vfc_cmd->tgt_scsi_id;
203 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
204 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
205 entry->u.end.status = vfc_cmd->status;
206 entry->u.end.error = vfc_cmd->error;
207 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
208 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
209 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
210 break;
211 case IBMVFC_MAD_FORMAT:
212 entry->op_code = mad->opcode;
213 entry->u.end.status = mad->status;
214 break;
215 default:
216 break;
217
218 };
219 }
220
221 #else
222 #define ibmvfc_trc_start(evt) do { } while (0)
223 #define ibmvfc_trc_end(evt) do { } while (0)
224 #endif
225
226 /**
227 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
228 * @status: status / error class
229 * @error: error
230 *
231 * Return value:
232 * index into cmd_status / -EINVAL on failure
233 **/
234 static int ibmvfc_get_err_index(u16 status, u16 error)
235 {
236 int i;
237
238 for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
239 if ((cmd_status[i].status & status) == cmd_status[i].status &&
240 cmd_status[i].error == error)
241 return i;
242
243 return -EINVAL;
244 }
245
246 /**
247 * ibmvfc_get_cmd_error - Find the error description for the fcp response
248 * @status: status / error class
249 * @error: error
250 *
251 * Return value:
252 * error description string
253 **/
254 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
255 {
256 int rc = ibmvfc_get_err_index(status, error);
257 if (rc >= 0)
258 return cmd_status[rc].name;
259 return unknown_error;
260 }
261
262 /**
263 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
264 * @vfc_cmd: ibmvfc command struct
265 *
266 * Return value:
267 * SCSI result value to return for completed command
268 **/
269 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
270 {
271 int err;
272 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
273 int fc_rsp_len = rsp->fcp_rsp_len;
274
275 if ((rsp->flags & FCP_RSP_LEN_VALID) &&
276 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
277 rsp->data.info.rsp_code))
278 return DID_ERROR << 16;
279
280 err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
281 if (err >= 0)
282 return rsp->scsi_status | (cmd_status[err].result << 16);
283 return rsp->scsi_status | (DID_ERROR << 16);
284 }
285
286 /**
287 * ibmvfc_retry_cmd - Determine if error status is retryable
288 * @status: status / error class
289 * @error: error
290 *
291 * Return value:
292 * 1 if error should be retried / 0 if it should not
293 **/
294 static int ibmvfc_retry_cmd(u16 status, u16 error)
295 {
296 int rc = ibmvfc_get_err_index(status, error);
297
298 if (rc >= 0)
299 return cmd_status[rc].retry;
300 return 1;
301 }
302
303 static const char *unknown_fc_explain = "unknown fc explain";
304
305 static const struct {
306 u16 fc_explain;
307 char *name;
308 } ls_explain [] = {
309 { 0x00, "no additional explanation" },
310 { 0x01, "service parameter error - options" },
311 { 0x03, "service parameter error - initiator control" },
312 { 0x05, "service parameter error - recipient control" },
313 { 0x07, "service parameter error - received data field size" },
314 { 0x09, "service parameter error - concurrent seq" },
315 { 0x0B, "service parameter error - credit" },
316 { 0x0D, "invalid N_Port/F_Port_Name" },
317 { 0x0E, "invalid node/Fabric Name" },
318 { 0x0F, "invalid common service parameters" },
319 { 0x11, "invalid association header" },
320 { 0x13, "association header required" },
321 { 0x15, "invalid originator S_ID" },
322 { 0x17, "invalid OX_ID-RX-ID combination" },
323 { 0x19, "command (request) already in progress" },
324 { 0x1E, "N_Port Login requested" },
325 { 0x1F, "Invalid N_Port_ID" },
326 };
327
328 static const struct {
329 u16 fc_explain;
330 char *name;
331 } gs_explain [] = {
332 { 0x00, "no additional explanation" },
333 { 0x01, "port identifier not registered" },
334 { 0x02, "port name not registered" },
335 { 0x03, "node name not registered" },
336 { 0x04, "class of service not registered" },
337 { 0x06, "initial process associator not registered" },
338 { 0x07, "FC-4 TYPEs not registered" },
339 { 0x08, "symbolic port name not registered" },
340 { 0x09, "symbolic node name not registered" },
341 { 0x0A, "port type not registered" },
342 { 0xF0, "authorization exception" },
343 { 0xF1, "authentication exception" },
344 { 0xF2, "data base full" },
345 { 0xF3, "data base empty" },
346 { 0xF4, "processing request" },
347 { 0xF5, "unable to verify connection" },
348 { 0xF6, "devices not in a common zone" },
349 };
350
351 /**
352 * ibmvfc_get_ls_explain - Return the FC Explain description text
353 * @status: FC Explain status
354 *
355 * Returns:
356 * error string
357 **/
358 static const char *ibmvfc_get_ls_explain(u16 status)
359 {
360 int i;
361
362 for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
363 if (ls_explain[i].fc_explain == status)
364 return ls_explain[i].name;
365
366 return unknown_fc_explain;
367 }
368
369 /**
370 * ibmvfc_get_gs_explain - Return the FC Explain description text
371 * @status: FC Explain status
372 *
373 * Returns:
374 * error string
375 **/
376 static const char *ibmvfc_get_gs_explain(u16 status)
377 {
378 int i;
379
380 for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
381 if (gs_explain[i].fc_explain == status)
382 return gs_explain[i].name;
383
384 return unknown_fc_explain;
385 }
386
387 static const struct {
388 enum ibmvfc_fc_type fc_type;
389 char *name;
390 } fc_type [] = {
391 { IBMVFC_FABRIC_REJECT, "fabric reject" },
392 { IBMVFC_PORT_REJECT, "port reject" },
393 { IBMVFC_LS_REJECT, "ELS reject" },
394 { IBMVFC_FABRIC_BUSY, "fabric busy" },
395 { IBMVFC_PORT_BUSY, "port busy" },
396 { IBMVFC_BASIC_REJECT, "basic reject" },
397 };
398
399 static const char *unknown_fc_type = "unknown fc type";
400
401 /**
402 * ibmvfc_get_fc_type - Return the FC Type description text
403 * @status: FC Type error status
404 *
405 * Returns:
406 * error string
407 **/
408 static const char *ibmvfc_get_fc_type(u16 status)
409 {
410 int i;
411
412 for (i = 0; i < ARRAY_SIZE(fc_type); i++)
413 if (fc_type[i].fc_type == status)
414 return fc_type[i].name;
415
416 return unknown_fc_type;
417 }
418
419 /**
420 * ibmvfc_set_tgt_action - Set the next init action for the target
421 * @tgt: ibmvfc target struct
422 * @action: action to perform
423 *
424 **/
425 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
426 enum ibmvfc_target_action action)
427 {
428 switch (tgt->action) {
429 case IBMVFC_TGT_ACTION_DEL_RPORT:
430 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
431 tgt->action = action;
432 case IBMVFC_TGT_ACTION_DELETED_RPORT:
433 break;
434 default:
435 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
436 tgt->add_rport = 0;
437 tgt->action = action;
438 break;
439 }
440 }
441
442 /**
443 * ibmvfc_set_host_state - Set the state for the host
444 * @vhost: ibmvfc host struct
445 * @state: state to set host to
446 *
447 * Returns:
448 * 0 if state changed / non-zero if not changed
449 **/
450 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
451 enum ibmvfc_host_state state)
452 {
453 int rc = 0;
454
455 switch (vhost->state) {
456 case IBMVFC_HOST_OFFLINE:
457 rc = -EINVAL;
458 break;
459 default:
460 vhost->state = state;
461 break;
462 };
463
464 return rc;
465 }
466
467 /**
468 * ibmvfc_set_host_action - Set the next init action for the host
469 * @vhost: ibmvfc host struct
470 * @action: action to perform
471 *
472 **/
473 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
474 enum ibmvfc_host_action action)
475 {
476 switch (action) {
477 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
478 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
479 vhost->action = action;
480 break;
481 case IBMVFC_HOST_ACTION_LOGO_WAIT:
482 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
483 vhost->action = action;
484 break;
485 case IBMVFC_HOST_ACTION_INIT_WAIT:
486 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
487 vhost->action = action;
488 break;
489 case IBMVFC_HOST_ACTION_QUERY:
490 switch (vhost->action) {
491 case IBMVFC_HOST_ACTION_INIT_WAIT:
492 case IBMVFC_HOST_ACTION_NONE:
493 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
494 vhost->action = action;
495 break;
496 default:
497 break;
498 };
499 break;
500 case IBMVFC_HOST_ACTION_TGT_INIT:
501 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
502 vhost->action = action;
503 break;
504 case IBMVFC_HOST_ACTION_INIT:
505 case IBMVFC_HOST_ACTION_TGT_DEL:
506 switch (vhost->action) {
507 case IBMVFC_HOST_ACTION_RESET:
508 case IBMVFC_HOST_ACTION_REENABLE:
509 break;
510 default:
511 vhost->action = action;
512 break;
513 };
514 break;
515 case IBMVFC_HOST_ACTION_LOGO:
516 case IBMVFC_HOST_ACTION_QUERY_TGTS:
517 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
518 case IBMVFC_HOST_ACTION_NONE:
519 case IBMVFC_HOST_ACTION_RESET:
520 case IBMVFC_HOST_ACTION_REENABLE:
521 default:
522 vhost->action = action;
523 break;
524 };
525 }
526
527 /**
528 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
529 * @vhost: ibmvfc host struct
530 *
531 * Return value:
532 * nothing
533 **/
534 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
535 {
536 if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
537 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
538 scsi_block_requests(vhost->host);
539 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
540 }
541 } else
542 vhost->reinit = 1;
543
544 wake_up(&vhost->work_wait_q);
545 }
546
547 /**
548 * ibmvfc_link_down - Handle a link down event from the adapter
549 * @vhost: ibmvfc host struct
550 * @state: ibmvfc host state to enter
551 *
552 **/
553 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
554 enum ibmvfc_host_state state)
555 {
556 struct ibmvfc_target *tgt;
557
558 ENTER;
559 scsi_block_requests(vhost->host);
560 list_for_each_entry(tgt, &vhost->targets, queue)
561 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
562 ibmvfc_set_host_state(vhost, state);
563 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
564 vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
565 wake_up(&vhost->work_wait_q);
566 LEAVE;
567 }
568
569 /**
570 * ibmvfc_init_host - Start host initialization
571 * @vhost: ibmvfc host struct
572 *
573 * Return value:
574 * nothing
575 **/
576 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
577 {
578 struct ibmvfc_target *tgt;
579
580 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
581 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
582 dev_err(vhost->dev,
583 "Host initialization retries exceeded. Taking adapter offline\n");
584 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
585 return;
586 }
587 }
588
589 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
590 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
591 vhost->async_crq.cur = 0;
592
593 list_for_each_entry(tgt, &vhost->targets, queue)
594 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
595 scsi_block_requests(vhost->host);
596 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
597 vhost->job_step = ibmvfc_npiv_login;
598 wake_up(&vhost->work_wait_q);
599 }
600 }
601
602 /**
603 * ibmvfc_send_crq - Send a CRQ
604 * @vhost: ibmvfc host struct
605 * @word1: the first 64 bits of the data
606 * @word2: the second 64 bits of the data
607 *
608 * Return value:
609 * 0 on success / other on failure
610 **/
611 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
612 {
613 struct vio_dev *vdev = to_vio_dev(vhost->dev);
614 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
615 }
616
617 /**
618 * ibmvfc_send_crq_init - Send a CRQ init message
619 * @vhost: ibmvfc host struct
620 *
621 * Return value:
622 * 0 on success / other on failure
623 **/
624 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
625 {
626 ibmvfc_dbg(vhost, "Sending CRQ init\n");
627 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
628 }
629
630 /**
631 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
632 * @vhost: ibmvfc host struct
633 *
634 * Return value:
635 * 0 on success / other on failure
636 **/
637 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
638 {
639 ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
640 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
641 }
642
643 /**
644 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
645 * @vhost: ibmvfc host struct
646 *
647 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
648 * the crq with the hypervisor.
649 **/
650 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
651 {
652 long rc = 0;
653 struct vio_dev *vdev = to_vio_dev(vhost->dev);
654 struct ibmvfc_crq_queue *crq = &vhost->crq;
655
656 ibmvfc_dbg(vhost, "Releasing CRQ\n");
657 free_irq(vdev->irq, vhost);
658 tasklet_kill(&vhost->tasklet);
659 do {
660 if (rc)
661 msleep(100);
662 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
663 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
664
665 vhost->state = IBMVFC_NO_CRQ;
666 vhost->logged_in = 0;
667 dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
668 free_page((unsigned long)crq->msgs);
669 }
670
671 /**
672 * ibmvfc_reenable_crq_queue - reenables the CRQ
673 * @vhost: ibmvfc host struct
674 *
675 * Return value:
676 * 0 on success / other on failure
677 **/
678 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
679 {
680 int rc = 0;
681 struct vio_dev *vdev = to_vio_dev(vhost->dev);
682
683 /* Re-enable the CRQ */
684 do {
685 if (rc)
686 msleep(100);
687 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
688 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
689
690 if (rc)
691 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
692
693 return rc;
694 }
695
696 /**
697 * ibmvfc_reset_crq - resets a crq after a failure
698 * @vhost: ibmvfc host struct
699 *
700 * Return value:
701 * 0 on success / other on failure
702 **/
703 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
704 {
705 int rc = 0;
706 unsigned long flags;
707 struct vio_dev *vdev = to_vio_dev(vhost->dev);
708 struct ibmvfc_crq_queue *crq = &vhost->crq;
709
710 /* Close the CRQ */
711 do {
712 if (rc)
713 msleep(100);
714 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
715 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
716
717 spin_lock_irqsave(vhost->host->host_lock, flags);
718 vhost->state = IBMVFC_NO_CRQ;
719 vhost->logged_in = 0;
720 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
721
722 /* Clean out the queue */
723 memset(crq->msgs, 0, PAGE_SIZE);
724 crq->cur = 0;
725
726 /* And re-open it again */
727 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
728 crq->msg_token, PAGE_SIZE);
729
730 if (rc == H_CLOSED)
731 /* Adapter is good, but other end is not ready */
732 dev_warn(vhost->dev, "Partner adapter not ready\n");
733 else if (rc != 0)
734 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
735 spin_unlock_irqrestore(vhost->host->host_lock, flags);
736
737 return rc;
738 }
739
740 /**
741 * ibmvfc_valid_event - Determines if event is valid.
742 * @pool: event_pool that contains the event
743 * @evt: ibmvfc event to be checked for validity
744 *
745 * Return value:
746 * 1 if event is valid / 0 if event is not valid
747 **/
748 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
749 struct ibmvfc_event *evt)
750 {
751 int index = evt - pool->events;
752 if (index < 0 || index >= pool->size) /* outside of bounds */
753 return 0;
754 if (evt != pool->events + index) /* unaligned */
755 return 0;
756 return 1;
757 }
758
759 /**
760 * ibmvfc_free_event - Free the specified event
761 * @evt: ibmvfc_event to be freed
762 *
763 **/
764 static void ibmvfc_free_event(struct ibmvfc_event *evt)
765 {
766 struct ibmvfc_host *vhost = evt->vhost;
767 struct ibmvfc_event_pool *pool = &vhost->pool;
768
769 BUG_ON(!ibmvfc_valid_event(pool, evt));
770 BUG_ON(atomic_inc_return(&evt->free) != 1);
771 list_add_tail(&evt->queue, &vhost->free);
772 }
773
774 /**
775 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
776 * @evt: ibmvfc event struct
777 *
778 * This function does not setup any error status, that must be done
779 * before this function gets called.
780 **/
781 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
782 {
783 struct scsi_cmnd *cmnd = evt->cmnd;
784
785 if (cmnd) {
786 scsi_dma_unmap(cmnd);
787 cmnd->scsi_done(cmnd);
788 }
789
790 if (evt->eh_comp)
791 complete(evt->eh_comp);
792
793 ibmvfc_free_event(evt);
794 }
795
796 /**
797 * ibmvfc_fail_request - Fail request with specified error code
798 * @evt: ibmvfc event struct
799 * @error_code: error code to fail request with
800 *
801 * Return value:
802 * none
803 **/
804 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
805 {
806 if (evt->cmnd) {
807 evt->cmnd->result = (error_code << 16);
808 evt->done = ibmvfc_scsi_eh_done;
809 } else
810 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
811
812 list_del(&evt->queue);
813 del_timer(&evt->timer);
814 ibmvfc_trc_end(evt);
815 evt->done(evt);
816 }
817
818 /**
819 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
820 * @vhost: ibmvfc host struct
821 * @error_code: error code to fail requests with
822 *
823 * Return value:
824 * none
825 **/
826 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
827 {
828 struct ibmvfc_event *evt, *pos;
829
830 ibmvfc_dbg(vhost, "Purging all requests\n");
831 list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
832 ibmvfc_fail_request(evt, error_code);
833 }
834
835 /**
836 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
837 * @vhost: struct ibmvfc host to reset
838 **/
839 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
840 {
841 ibmvfc_purge_requests(vhost, DID_ERROR);
842 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
843 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
844 }
845
846 /**
847 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
848 * @vhost: struct ibmvfc host to reset
849 **/
850 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
851 {
852 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
853 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
854 scsi_block_requests(vhost->host);
855 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
856 vhost->job_step = ibmvfc_npiv_logout;
857 wake_up(&vhost->work_wait_q);
858 } else
859 ibmvfc_hard_reset_host(vhost);
860 }
861
862 /**
863 * ibmvfc_reset_host - Reset the connection to the server
864 * @vhost: ibmvfc host struct
865 **/
866 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
867 {
868 unsigned long flags;
869
870 spin_lock_irqsave(vhost->host->host_lock, flags);
871 __ibmvfc_reset_host(vhost);
872 spin_unlock_irqrestore(vhost->host->host_lock, flags);
873 }
874
875 /**
876 * ibmvfc_retry_host_init - Retry host initialization if allowed
877 * @vhost: ibmvfc host struct
878 *
879 * Returns: 1 if init will be retried / 0 if not
880 *
881 **/
882 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
883 {
884 int retry = 0;
885
886 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
887 vhost->delay_init = 1;
888 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
889 dev_err(vhost->dev,
890 "Host initialization retries exceeded. Taking adapter offline\n");
891 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
892 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
893 __ibmvfc_reset_host(vhost);
894 else {
895 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
896 retry = 1;
897 }
898 }
899
900 wake_up(&vhost->work_wait_q);
901 return retry;
902 }
903
904 /**
905 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
906 * @starget: scsi target struct
907 *
908 * Return value:
909 * ibmvfc_target struct / NULL if not found
910 **/
911 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
912 {
913 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
914 struct ibmvfc_host *vhost = shost_priv(shost);
915 struct ibmvfc_target *tgt;
916
917 list_for_each_entry(tgt, &vhost->targets, queue)
918 if (tgt->target_id == starget->id) {
919 kref_get(&tgt->kref);
920 return tgt;
921 }
922 return NULL;
923 }
924
925 /**
926 * ibmvfc_get_target - Find the specified scsi_target
927 * @starget: scsi target struct
928 *
929 * Return value:
930 * ibmvfc_target struct / NULL if not found
931 **/
932 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
933 {
934 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
935 struct ibmvfc_target *tgt;
936 unsigned long flags;
937
938 spin_lock_irqsave(shost->host_lock, flags);
939 tgt = __ibmvfc_get_target(starget);
940 spin_unlock_irqrestore(shost->host_lock, flags);
941 return tgt;
942 }
943
944 /**
945 * ibmvfc_get_host_speed - Get host port speed
946 * @shost: scsi host struct
947 *
948 * Return value:
949 * none
950 **/
951 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
952 {
953 struct ibmvfc_host *vhost = shost_priv(shost);
954 unsigned long flags;
955
956 spin_lock_irqsave(shost->host_lock, flags);
957 if (vhost->state == IBMVFC_ACTIVE) {
958 switch (vhost->login_buf->resp.link_speed / 100) {
959 case 1:
960 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
961 break;
962 case 2:
963 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
964 break;
965 case 4:
966 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
967 break;
968 case 8:
969 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
970 break;
971 case 10:
972 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
973 break;
974 case 16:
975 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
976 break;
977 default:
978 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
979 vhost->login_buf->resp.link_speed / 100);
980 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
981 break;
982 }
983 } else
984 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
985 spin_unlock_irqrestore(shost->host_lock, flags);
986 }
987
988 /**
989 * ibmvfc_get_host_port_state - Get host port state
990 * @shost: scsi host struct
991 *
992 * Return value:
993 * none
994 **/
995 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
996 {
997 struct ibmvfc_host *vhost = shost_priv(shost);
998 unsigned long flags;
999
1000 spin_lock_irqsave(shost->host_lock, flags);
1001 switch (vhost->state) {
1002 case IBMVFC_INITIALIZING:
1003 case IBMVFC_ACTIVE:
1004 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1005 break;
1006 case IBMVFC_LINK_DOWN:
1007 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1008 break;
1009 case IBMVFC_LINK_DEAD:
1010 case IBMVFC_HOST_OFFLINE:
1011 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1012 break;
1013 case IBMVFC_HALTED:
1014 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1015 break;
1016 case IBMVFC_NO_CRQ:
1017 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1018 break;
1019 default:
1020 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1021 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022 break;
1023 }
1024 spin_unlock_irqrestore(shost->host_lock, flags);
1025 }
1026
1027 /**
1028 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1029 * @rport: rport struct
1030 * @timeout: timeout value
1031 *
1032 * Return value:
1033 * none
1034 **/
1035 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1036 {
1037 if (timeout)
1038 rport->dev_loss_tmo = timeout;
1039 else
1040 rport->dev_loss_tmo = 1;
1041 }
1042
1043 /**
1044 * ibmvfc_release_tgt - Free memory allocated for a target
1045 * @kref: kref struct
1046 *
1047 **/
1048 static void ibmvfc_release_tgt(struct kref *kref)
1049 {
1050 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1051 kfree(tgt);
1052 }
1053
1054 /**
1055 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1056 * @starget: scsi target struct
1057 *
1058 * Return value:
1059 * none
1060 **/
1061 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1062 {
1063 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1064 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1065 if (tgt)
1066 kref_put(&tgt->kref, ibmvfc_release_tgt);
1067 }
1068
1069 /**
1070 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1071 * @starget: scsi target struct
1072 *
1073 * Return value:
1074 * none
1075 **/
1076 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1077 {
1078 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1079 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1080 if (tgt)
1081 kref_put(&tgt->kref, ibmvfc_release_tgt);
1082 }
1083
1084 /**
1085 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1086 * @starget: scsi target struct
1087 *
1088 * Return value:
1089 * none
1090 **/
1091 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1092 {
1093 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1094 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1095 if (tgt)
1096 kref_put(&tgt->kref, ibmvfc_release_tgt);
1097 }
1098
1099 /**
1100 * ibmvfc_wait_while_resetting - Wait while the host resets
1101 * @vhost: ibmvfc host struct
1102 *
1103 * Return value:
1104 * 0 on success / other on failure
1105 **/
1106 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1107 {
1108 long timeout = wait_event_timeout(vhost->init_wait_q,
1109 ((vhost->state == IBMVFC_ACTIVE ||
1110 vhost->state == IBMVFC_HOST_OFFLINE ||
1111 vhost->state == IBMVFC_LINK_DEAD) &&
1112 vhost->action == IBMVFC_HOST_ACTION_NONE),
1113 (init_timeout * HZ));
1114
1115 return timeout ? 0 : -EIO;
1116 }
1117
1118 /**
1119 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1120 * @shost: scsi host struct
1121 *
1122 * Return value:
1123 * 0 on success / other on failure
1124 **/
1125 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1126 {
1127 struct ibmvfc_host *vhost = shost_priv(shost);
1128
1129 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1130 ibmvfc_reset_host(vhost);
1131 return ibmvfc_wait_while_resetting(vhost);
1132 }
1133
1134 /**
1135 * ibmvfc_gather_partition_info - Gather info about the LPAR
1136 *
1137 * Return value:
1138 * none
1139 **/
1140 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1141 {
1142 struct device_node *rootdn;
1143 const char *name;
1144 const unsigned int *num;
1145
1146 rootdn = of_find_node_by_path("/");
1147 if (!rootdn)
1148 return;
1149
1150 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1151 if (name)
1152 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1153 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1154 if (num)
1155 vhost->partition_number = *num;
1156 of_node_put(rootdn);
1157 }
1158
1159 /**
1160 * ibmvfc_set_login_info - Setup info for NPIV login
1161 * @vhost: ibmvfc host struct
1162 *
1163 * Return value:
1164 * none
1165 **/
1166 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1167 {
1168 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1169 struct device_node *of_node = vhost->dev->of_node;
1170 const char *location;
1171
1172 memset(login_info, 0, sizeof(*login_info));
1173
1174 login_info->ostype = IBMVFC_OS_LINUX;
1175 login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1176 login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1177 login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1178 login_info->partition_num = vhost->partition_number;
1179 login_info->vfc_frame_version = 1;
1180 login_info->fcp_version = 3;
1181 login_info->flags = IBMVFC_FLUSH_ON_HALT;
1182 if (vhost->client_migrated)
1183 login_info->flags |= IBMVFC_CLIENT_MIGRATED;
1184
1185 login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1186 login_info->capabilities = IBMVFC_CAN_MIGRATE;
1187 login_info->async.va = vhost->async_crq.msg_token;
1188 login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
1189 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1190 strncpy(login_info->device_name,
1191 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1192
1193 location = of_get_property(of_node, "ibm,loc-code", NULL);
1194 location = location ? location : dev_name(vhost->dev);
1195 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1196 }
1197
1198 /**
1199 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1200 * @vhost: ibmvfc host who owns the event pool
1201 *
1202 * Returns zero on success.
1203 **/
1204 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1205 {
1206 int i;
1207 struct ibmvfc_event_pool *pool = &vhost->pool;
1208
1209 ENTER;
1210 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1211 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1212 if (!pool->events)
1213 return -ENOMEM;
1214
1215 pool->iu_storage = dma_alloc_coherent(vhost->dev,
1216 pool->size * sizeof(*pool->iu_storage),
1217 &pool->iu_token, 0);
1218
1219 if (!pool->iu_storage) {
1220 kfree(pool->events);
1221 return -ENOMEM;
1222 }
1223
1224 for (i = 0; i < pool->size; ++i) {
1225 struct ibmvfc_event *evt = &pool->events[i];
1226 atomic_set(&evt->free, 1);
1227 evt->crq.valid = 0x80;
1228 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1229 evt->xfer_iu = pool->iu_storage + i;
1230 evt->vhost = vhost;
1231 evt->ext_list = NULL;
1232 list_add_tail(&evt->queue, &vhost->free);
1233 }
1234
1235 LEAVE;
1236 return 0;
1237 }
1238
1239 /**
1240 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1241 * @vhost: ibmvfc host who owns the event pool
1242 *
1243 **/
1244 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1245 {
1246 int i;
1247 struct ibmvfc_event_pool *pool = &vhost->pool;
1248
1249 ENTER;
1250 for (i = 0; i < pool->size; ++i) {
1251 list_del(&pool->events[i].queue);
1252 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1253 if (pool->events[i].ext_list)
1254 dma_pool_free(vhost->sg_pool,
1255 pool->events[i].ext_list,
1256 pool->events[i].ext_list_token);
1257 }
1258
1259 kfree(pool->events);
1260 dma_free_coherent(vhost->dev,
1261 pool->size * sizeof(*pool->iu_storage),
1262 pool->iu_storage, pool->iu_token);
1263 LEAVE;
1264 }
1265
1266 /**
1267 * ibmvfc_get_event - Gets the next free event in pool
1268 * @vhost: ibmvfc host struct
1269 *
1270 * Returns a free event from the pool.
1271 **/
1272 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1273 {
1274 struct ibmvfc_event *evt;
1275
1276 BUG_ON(list_empty(&vhost->free));
1277 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1278 atomic_set(&evt->free, 0);
1279 list_del(&evt->queue);
1280 return evt;
1281 }
1282
1283 /**
1284 * ibmvfc_init_event - Initialize fields in an event struct that are always
1285 * required.
1286 * @evt: The event
1287 * @done: Routine to call when the event is responded to
1288 * @format: SRP or MAD format
1289 **/
1290 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1291 void (*done) (struct ibmvfc_event *), u8 format)
1292 {
1293 evt->cmnd = NULL;
1294 evt->sync_iu = NULL;
1295 evt->crq.format = format;
1296 evt->done = done;
1297 evt->eh_comp = NULL;
1298 }
1299
1300 /**
1301 * ibmvfc_map_sg_list - Initialize scatterlist
1302 * @scmd: scsi command struct
1303 * @nseg: number of scatterlist segments
1304 * @md: memory descriptor list to initialize
1305 **/
1306 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1307 struct srp_direct_buf *md)
1308 {
1309 int i;
1310 struct scatterlist *sg;
1311
1312 scsi_for_each_sg(scmd, sg, nseg, i) {
1313 md[i].va = sg_dma_address(sg);
1314 md[i].len = sg_dma_len(sg);
1315 md[i].key = 0;
1316 }
1317 }
1318
1319 /**
1320 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1321 * @scmd: Scsi_Cmnd with the scatterlist
1322 * @evt: ibmvfc event struct
1323 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1324 * @dev: device for which to map dma memory
1325 *
1326 * Returns:
1327 * 0 on success / non-zero on failure
1328 **/
1329 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1330 struct ibmvfc_event *evt,
1331 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1332 {
1333
1334 int sg_mapped;
1335 struct srp_direct_buf *data = &vfc_cmd->ioba;
1336 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1337
1338 sg_mapped = scsi_dma_map(scmd);
1339 if (!sg_mapped) {
1340 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1341 return 0;
1342 } else if (unlikely(sg_mapped < 0)) {
1343 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1344 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1345 return sg_mapped;
1346 }
1347
1348 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1349 vfc_cmd->flags |= IBMVFC_WRITE;
1350 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1351 } else {
1352 vfc_cmd->flags |= IBMVFC_READ;
1353 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1354 }
1355
1356 if (sg_mapped == 1) {
1357 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1358 return 0;
1359 }
1360
1361 vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1362
1363 if (!evt->ext_list) {
1364 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1365 &evt->ext_list_token);
1366
1367 if (!evt->ext_list) {
1368 scsi_dma_unmap(scmd);
1369 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1370 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1371 return -ENOMEM;
1372 }
1373 }
1374
1375 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1376
1377 data->va = evt->ext_list_token;
1378 data->len = sg_mapped * sizeof(struct srp_direct_buf);
1379 data->key = 0;
1380 return 0;
1381 }
1382
1383 /**
1384 * ibmvfc_timeout - Internal command timeout handler
1385 * @evt: struct ibmvfc_event that timed out
1386 *
1387 * Called when an internally generated command times out
1388 **/
1389 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1390 {
1391 struct ibmvfc_host *vhost = evt->vhost;
1392 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1393 ibmvfc_reset_host(vhost);
1394 }
1395
1396 /**
1397 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1398 * @evt: event to be sent
1399 * @vhost: ibmvfc host struct
1400 * @timeout: timeout in seconds - 0 means do not time command
1401 *
1402 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1403 **/
1404 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1405 struct ibmvfc_host *vhost, unsigned long timeout)
1406 {
1407 u64 *crq_as_u64 = (u64 *) &evt->crq;
1408 int rc;
1409
1410 /* Copy the IU into the transfer area */
1411 *evt->xfer_iu = evt->iu;
1412 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1413 evt->xfer_iu->cmd.tag = (u64)evt;
1414 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1415 evt->xfer_iu->mad_common.tag = (u64)evt;
1416 else
1417 BUG();
1418
1419 list_add_tail(&evt->queue, &vhost->sent);
1420 init_timer(&evt->timer);
1421
1422 if (timeout) {
1423 evt->timer.data = (unsigned long) evt;
1424 evt->timer.expires = jiffies + (timeout * HZ);
1425 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1426 add_timer(&evt->timer);
1427 }
1428
1429 mb();
1430
1431 if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1432 list_del(&evt->queue);
1433 del_timer(&evt->timer);
1434
1435 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1436 * Firmware will send a CRQ with a transport event (0xFF) to
1437 * tell this client what has happened to the transport. This
1438 * will be handled in ibmvfc_handle_crq()
1439 */
1440 if (rc == H_CLOSED) {
1441 if (printk_ratelimit())
1442 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1443 if (evt->cmnd)
1444 scsi_dma_unmap(evt->cmnd);
1445 ibmvfc_free_event(evt);
1446 return SCSI_MLQUEUE_HOST_BUSY;
1447 }
1448
1449 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1450 if (evt->cmnd) {
1451 evt->cmnd->result = DID_ERROR << 16;
1452 evt->done = ibmvfc_scsi_eh_done;
1453 } else
1454 evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1455
1456 evt->done(evt);
1457 } else
1458 ibmvfc_trc_start(evt);
1459
1460 return 0;
1461 }
1462
1463 /**
1464 * ibmvfc_log_error - Log an error for the failed command if appropriate
1465 * @evt: ibmvfc event to log
1466 *
1467 **/
1468 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1469 {
1470 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1471 struct ibmvfc_host *vhost = evt->vhost;
1472 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1473 struct scsi_cmnd *cmnd = evt->cmnd;
1474 const char *err = unknown_error;
1475 int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1476 int logerr = 0;
1477 int rsp_code = 0;
1478
1479 if (index >= 0) {
1480 logerr = cmd_status[index].log;
1481 err = cmd_status[index].name;
1482 }
1483
1484 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1485 return;
1486
1487 if (rsp->flags & FCP_RSP_LEN_VALID)
1488 rsp_code = rsp->data.info.rsp_code;
1489
1490 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1491 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1492 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1493 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1494 }
1495
1496 /**
1497 * ibmvfc_relogin - Log back into the specified device
1498 * @sdev: scsi device struct
1499 *
1500 **/
1501 static void ibmvfc_relogin(struct scsi_device *sdev)
1502 {
1503 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1504 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1505 struct ibmvfc_target *tgt;
1506
1507 list_for_each_entry(tgt, &vhost->targets, queue) {
1508 if (rport == tgt->rport) {
1509 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1510 break;
1511 }
1512 }
1513
1514 ibmvfc_reinit_host(vhost);
1515 }
1516
1517 /**
1518 * ibmvfc_scsi_done - Handle responses from commands
1519 * @evt: ibmvfc event to be handled
1520 *
1521 * Used as a callback when sending scsi cmds.
1522 **/
1523 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1524 {
1525 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1526 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1527 struct scsi_cmnd *cmnd = evt->cmnd;
1528 u32 rsp_len = 0;
1529 u32 sense_len = rsp->fcp_sense_len;
1530
1531 if (cmnd) {
1532 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1533 scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1534 else if (rsp->flags & FCP_RESID_UNDER)
1535 scsi_set_resid(cmnd, rsp->fcp_resid);
1536 else
1537 scsi_set_resid(cmnd, 0);
1538
1539 if (vfc_cmd->status) {
1540 cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1541
1542 if (rsp->flags & FCP_RSP_LEN_VALID)
1543 rsp_len = rsp->fcp_rsp_len;
1544 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1545 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1546 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1547 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1548 if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1549 ibmvfc_relogin(cmnd->device);
1550
1551 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1552 cmnd->result = (DID_ERROR << 16);
1553
1554 ibmvfc_log_error(evt);
1555 }
1556
1557 if (!cmnd->result &&
1558 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1559 cmnd->result = (DID_ERROR << 16);
1560
1561 scsi_dma_unmap(cmnd);
1562 cmnd->scsi_done(cmnd);
1563 }
1564
1565 if (evt->eh_comp)
1566 complete(evt->eh_comp);
1567
1568 ibmvfc_free_event(evt);
1569 }
1570
1571 /**
1572 * ibmvfc_host_chkready - Check if the host can accept commands
1573 * @vhost: struct ibmvfc host
1574 *
1575 * Returns:
1576 * 1 if host can accept command / 0 if not
1577 **/
1578 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1579 {
1580 int result = 0;
1581
1582 switch (vhost->state) {
1583 case IBMVFC_LINK_DEAD:
1584 case IBMVFC_HOST_OFFLINE:
1585 result = DID_NO_CONNECT << 16;
1586 break;
1587 case IBMVFC_NO_CRQ:
1588 case IBMVFC_INITIALIZING:
1589 case IBMVFC_HALTED:
1590 case IBMVFC_LINK_DOWN:
1591 result = DID_REQUEUE << 16;
1592 break;
1593 case IBMVFC_ACTIVE:
1594 result = 0;
1595 break;
1596 };
1597
1598 return result;
1599 }
1600
1601 /**
1602 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1603 * @cmnd: struct scsi_cmnd to be executed
1604 * @done: Callback function to be called when cmnd is completed
1605 *
1606 * Returns:
1607 * 0 on success / other on failure
1608 **/
1609 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1610 void (*done) (struct scsi_cmnd *))
1611 {
1612 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1613 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1614 struct ibmvfc_cmd *vfc_cmd;
1615 struct ibmvfc_event *evt;
1616 u8 tag[2];
1617 int rc;
1618
1619 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1620 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1621 cmnd->result = rc;
1622 done(cmnd);
1623 return 0;
1624 }
1625
1626 cmnd->result = (DID_OK << 16);
1627 evt = ibmvfc_get_event(vhost);
1628 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1629 evt->cmnd = cmnd;
1630 cmnd->scsi_done = done;
1631 vfc_cmd = &evt->iu.cmd;
1632 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1633 vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1634 vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1635 vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1636 vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1637 vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1638 vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1639 vfc_cmd->tgt_scsi_id = rport->port_id;
1640 vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1641 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1642 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1643
1644 if (scsi_populate_tag_msg(cmnd, tag)) {
1645 vfc_cmd->task_tag = tag[1];
1646 switch (tag[0]) {
1647 case MSG_SIMPLE_TAG:
1648 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1649 break;
1650 case MSG_HEAD_TAG:
1651 vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1652 break;
1653 case MSG_ORDERED_TAG:
1654 vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1655 break;
1656 };
1657 }
1658
1659 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1660 return ibmvfc_send_event(evt, vhost, 0);
1661
1662 ibmvfc_free_event(evt);
1663 if (rc == -ENOMEM)
1664 return SCSI_MLQUEUE_HOST_BUSY;
1665
1666 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1667 scmd_printk(KERN_ERR, cmnd,
1668 "Failed to map DMA buffer for command. rc=%d\n", rc);
1669
1670 cmnd->result = DID_ERROR << 16;
1671 done(cmnd);
1672 return 0;
1673 }
1674
1675 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1676
1677 /**
1678 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1679 * @evt: ibmvfc event struct
1680 *
1681 **/
1682 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1683 {
1684 /* copy the response back */
1685 if (evt->sync_iu)
1686 *evt->sync_iu = *evt->xfer_iu;
1687
1688 complete(&evt->comp);
1689 }
1690
1691 /**
1692 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1693 * @evt: struct ibmvfc_event
1694 *
1695 **/
1696 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1697 {
1698 struct ibmvfc_host *vhost = evt->vhost;
1699
1700 ibmvfc_free_event(evt);
1701 vhost->aborting_passthru = 0;
1702 dev_info(vhost->dev, "Passthru command cancelled\n");
1703 }
1704
1705 /**
1706 * ibmvfc_bsg_timeout - Handle a BSG timeout
1707 * @job: struct fc_bsg_job that timed out
1708 *
1709 * Returns:
1710 * 0 on success / other on failure
1711 **/
1712 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1713 {
1714 struct ibmvfc_host *vhost = shost_priv(job->shost);
1715 unsigned long port_id = (unsigned long)job->dd_data;
1716 struct ibmvfc_event *evt;
1717 struct ibmvfc_tmf *tmf;
1718 unsigned long flags;
1719 int rc;
1720
1721 ENTER;
1722 spin_lock_irqsave(vhost->host->host_lock, flags);
1723 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1724 __ibmvfc_reset_host(vhost);
1725 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1726 return 0;
1727 }
1728
1729 vhost->aborting_passthru = 1;
1730 evt = ibmvfc_get_event(vhost);
1731 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1732
1733 tmf = &evt->iu.tmf;
1734 memset(tmf, 0, sizeof(*tmf));
1735 tmf->common.version = 1;
1736 tmf->common.opcode = IBMVFC_TMF_MAD;
1737 tmf->common.length = sizeof(*tmf);
1738 tmf->scsi_id = port_id;
1739 tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1740 tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
1741 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1742
1743 if (rc != 0) {
1744 vhost->aborting_passthru = 0;
1745 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1746 rc = -EIO;
1747 } else
1748 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1749 port_id);
1750
1751 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1752
1753 LEAVE;
1754 return rc;
1755 }
1756
1757 /**
1758 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1759 * @vhost: struct ibmvfc_host to send command
1760 * @port_id: port ID to send command
1761 *
1762 * Returns:
1763 * 0 on success / other on failure
1764 **/
1765 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1766 {
1767 struct ibmvfc_port_login *plogi;
1768 struct ibmvfc_target *tgt;
1769 struct ibmvfc_event *evt;
1770 union ibmvfc_iu rsp_iu;
1771 unsigned long flags;
1772 int rc = 0, issue_login = 1;
1773
1774 ENTER;
1775 spin_lock_irqsave(vhost->host->host_lock, flags);
1776 list_for_each_entry(tgt, &vhost->targets, queue) {
1777 if (tgt->scsi_id == port_id) {
1778 issue_login = 0;
1779 break;
1780 }
1781 }
1782
1783 if (!issue_login)
1784 goto unlock_out;
1785 if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1786 goto unlock_out;
1787
1788 evt = ibmvfc_get_event(vhost);
1789 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1790 plogi = &evt->iu.plogi;
1791 memset(plogi, 0, sizeof(*plogi));
1792 plogi->common.version = 1;
1793 plogi->common.opcode = IBMVFC_PORT_LOGIN;
1794 plogi->common.length = sizeof(*plogi);
1795 plogi->scsi_id = port_id;
1796 evt->sync_iu = &rsp_iu;
1797 init_completion(&evt->comp);
1798
1799 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1800 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1801
1802 if (rc)
1803 return -EIO;
1804
1805 wait_for_completion(&evt->comp);
1806
1807 if (rsp_iu.plogi.common.status)
1808 rc = -EIO;
1809
1810 spin_lock_irqsave(vhost->host->host_lock, flags);
1811 ibmvfc_free_event(evt);
1812 unlock_out:
1813 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1814 LEAVE;
1815 return rc;
1816 }
1817
1818 /**
1819 * ibmvfc_bsg_request - Handle a BSG request
1820 * @job: struct fc_bsg_job to be executed
1821 *
1822 * Returns:
1823 * 0 on success / other on failure
1824 **/
1825 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1826 {
1827 struct ibmvfc_host *vhost = shost_priv(job->shost);
1828 struct fc_rport *rport = job->rport;
1829 struct ibmvfc_passthru_mad *mad;
1830 struct ibmvfc_event *evt;
1831 union ibmvfc_iu rsp_iu;
1832 unsigned long flags, port_id = -1;
1833 unsigned int code = job->request->msgcode;
1834 int rc = 0, req_seg, rsp_seg, issue_login = 0;
1835 u32 fc_flags, rsp_len;
1836
1837 ENTER;
1838 job->reply->reply_payload_rcv_len = 0;
1839 if (rport)
1840 port_id = rport->port_id;
1841
1842 switch (code) {
1843 case FC_BSG_HST_ELS_NOLOGIN:
1844 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1845 (job->request->rqst_data.h_els.port_id[1] << 8) |
1846 job->request->rqst_data.h_els.port_id[2];
1847 case FC_BSG_RPT_ELS:
1848 fc_flags = IBMVFC_FC_ELS;
1849 break;
1850 case FC_BSG_HST_CT:
1851 issue_login = 1;
1852 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1853 (job->request->rqst_data.h_ct.port_id[1] << 8) |
1854 job->request->rqst_data.h_ct.port_id[2];
1855 case FC_BSG_RPT_CT:
1856 fc_flags = IBMVFC_FC_CT_IU;
1857 break;
1858 default:
1859 return -ENOTSUPP;
1860 };
1861
1862 if (port_id == -1)
1863 return -EINVAL;
1864 if (!mutex_trylock(&vhost->passthru_mutex))
1865 return -EBUSY;
1866
1867 job->dd_data = (void *)port_id;
1868 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1869 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1870
1871 if (!req_seg) {
1872 mutex_unlock(&vhost->passthru_mutex);
1873 return -ENOMEM;
1874 }
1875
1876 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1877 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1878
1879 if (!rsp_seg) {
1880 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1881 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1882 mutex_unlock(&vhost->passthru_mutex);
1883 return -ENOMEM;
1884 }
1885
1886 if (req_seg > 1 || rsp_seg > 1) {
1887 rc = -EINVAL;
1888 goto out;
1889 }
1890
1891 if (issue_login)
1892 rc = ibmvfc_bsg_plogi(vhost, port_id);
1893
1894 spin_lock_irqsave(vhost->host->host_lock, flags);
1895
1896 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1897 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1898 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1899 goto out;
1900 }
1901
1902 evt = ibmvfc_get_event(vhost);
1903 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1904 mad = &evt->iu.passthru;
1905
1906 memset(mad, 0, sizeof(*mad));
1907 mad->common.version = 1;
1908 mad->common.opcode = IBMVFC_PASSTHRU;
1909 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
1910
1911 mad->cmd_ioba.va = (u64)evt->crq.ioba +
1912 offsetof(struct ibmvfc_passthru_mad, iu);
1913 mad->cmd_ioba.len = sizeof(mad->iu);
1914
1915 mad->iu.cmd_len = job->request_payload.payload_len;
1916 mad->iu.rsp_len = job->reply_payload.payload_len;
1917 mad->iu.flags = fc_flags;
1918 mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1919
1920 mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
1921 mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
1922 mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
1923 mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
1924 mad->iu.scsi_id = port_id;
1925 mad->iu.tag = (u64)evt;
1926 rsp_len = mad->iu.rsp.len;
1927
1928 evt->sync_iu = &rsp_iu;
1929 init_completion(&evt->comp);
1930 rc = ibmvfc_send_event(evt, vhost, 0);
1931 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1932
1933 if (rc) {
1934 rc = -EIO;
1935 goto out;
1936 }
1937
1938 wait_for_completion(&evt->comp);
1939
1940 if (rsp_iu.passthru.common.status)
1941 rc = -EIO;
1942 else
1943 job->reply->reply_payload_rcv_len = rsp_len;
1944
1945 spin_lock_irqsave(vhost->host->host_lock, flags);
1946 ibmvfc_free_event(evt);
1947 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1948 job->reply->result = rc;
1949 job->job_done(job);
1950 rc = 0;
1951 out:
1952 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1953 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1954 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1955 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1956 mutex_unlock(&vhost->passthru_mutex);
1957 LEAVE;
1958 return rc;
1959 }
1960
1961 /**
1962 * ibmvfc_reset_device - Reset the device with the specified reset type
1963 * @sdev: scsi device to reset
1964 * @type: reset type
1965 * @desc: reset type description for log messages
1966 *
1967 * Returns:
1968 * 0 on success / other on failure
1969 **/
1970 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1971 {
1972 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1973 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1974 struct ibmvfc_cmd *tmf;
1975 struct ibmvfc_event *evt = NULL;
1976 union ibmvfc_iu rsp_iu;
1977 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1978 int rsp_rc = -EBUSY;
1979 unsigned long flags;
1980 int rsp_code = 0;
1981
1982 spin_lock_irqsave(vhost->host->host_lock, flags);
1983 if (vhost->state == IBMVFC_ACTIVE) {
1984 evt = ibmvfc_get_event(vhost);
1985 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1986
1987 tmf = &evt->iu.cmd;
1988 memset(tmf, 0, sizeof(*tmf));
1989 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1990 tmf->resp.len = sizeof(tmf->rsp);
1991 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1992 tmf->payload_len = sizeof(tmf->iu);
1993 tmf->resp_len = sizeof(tmf->rsp);
1994 tmf->cancel_key = (unsigned long)sdev->hostdata;
1995 tmf->tgt_scsi_id = rport->port_id;
1996 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1997 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1998 tmf->iu.tmf_flags = type;
1999 evt->sync_iu = &rsp_iu;
2000
2001 init_completion(&evt->comp);
2002 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2003 }
2004 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2005
2006 if (rsp_rc != 0) {
2007 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2008 desc, rsp_rc);
2009 return -EIO;
2010 }
2011
2012 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2013 wait_for_completion(&evt->comp);
2014
2015 if (rsp_iu.cmd.status)
2016 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2017
2018 if (rsp_code) {
2019 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2020 rsp_code = fc_rsp->data.info.rsp_code;
2021
2022 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2023 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2024 desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2025 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2026 fc_rsp->scsi_status);
2027 rsp_rc = -EIO;
2028 } else
2029 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2030
2031 spin_lock_irqsave(vhost->host->host_lock, flags);
2032 ibmvfc_free_event(evt);
2033 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2034 return rsp_rc;
2035 }
2036
2037 /**
2038 * ibmvfc_match_rport - Match function for specified remote port
2039 * @evt: ibmvfc event struct
2040 * @device: device to match (rport)
2041 *
2042 * Returns:
2043 * 1 if event matches rport / 0 if event does not match rport
2044 **/
2045 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2046 {
2047 struct fc_rport *cmd_rport;
2048
2049 if (evt->cmnd) {
2050 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2051 if (cmd_rport == rport)
2052 return 1;
2053 }
2054 return 0;
2055 }
2056
2057 /**
2058 * ibmvfc_match_target - Match function for specified target
2059 * @evt: ibmvfc event struct
2060 * @device: device to match (starget)
2061 *
2062 * Returns:
2063 * 1 if event matches starget / 0 if event does not match starget
2064 **/
2065 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2066 {
2067 if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2068 return 1;
2069 return 0;
2070 }
2071
2072 /**
2073 * ibmvfc_match_lun - Match function for specified LUN
2074 * @evt: ibmvfc event struct
2075 * @device: device to match (sdev)
2076 *
2077 * Returns:
2078 * 1 if event matches sdev / 0 if event does not match sdev
2079 **/
2080 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2081 {
2082 if (evt->cmnd && evt->cmnd->device == device)
2083 return 1;
2084 return 0;
2085 }
2086
2087 /**
2088 * ibmvfc_wait_for_ops - Wait for ops to complete
2089 * @vhost: ibmvfc host struct
2090 * @device: device to match (starget or sdev)
2091 * @match: match function
2092 *
2093 * Returns:
2094 * SUCCESS / FAILED
2095 **/
2096 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2097 int (*match) (struct ibmvfc_event *, void *))
2098 {
2099 struct ibmvfc_event *evt;
2100 DECLARE_COMPLETION_ONSTACK(comp);
2101 int wait;
2102 unsigned long flags;
2103 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2104
2105 ENTER;
2106 do {
2107 wait = 0;
2108 spin_lock_irqsave(vhost->host->host_lock, flags);
2109 list_for_each_entry(evt, &vhost->sent, queue) {
2110 if (match(evt, device)) {
2111 evt->eh_comp = &comp;
2112 wait++;
2113 }
2114 }
2115 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2116
2117 if (wait) {
2118 timeout = wait_for_completion_timeout(&comp, timeout);
2119
2120 if (!timeout) {
2121 wait = 0;
2122 spin_lock_irqsave(vhost->host->host_lock, flags);
2123 list_for_each_entry(evt, &vhost->sent, queue) {
2124 if (match(evt, device)) {
2125 evt->eh_comp = NULL;
2126 wait++;
2127 }
2128 }
2129 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2130 if (wait)
2131 dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2132 LEAVE;
2133 return wait ? FAILED : SUCCESS;
2134 }
2135 }
2136 } while (wait);
2137
2138 LEAVE;
2139 return SUCCESS;
2140 }
2141
2142 /**
2143 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2144 * @sdev: scsi device to cancel commands
2145 * @type: type of error recovery being performed
2146 *
2147 * This sends a cancel to the VIOS for the specified device. This does
2148 * NOT send any abort to the actual device. That must be done separately.
2149 *
2150 * Returns:
2151 * 0 on success / other on failure
2152 **/
2153 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2154 {
2155 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2156 struct scsi_target *starget = scsi_target(sdev);
2157 struct fc_rport *rport = starget_to_rport(starget);
2158 struct ibmvfc_tmf *tmf;
2159 struct ibmvfc_event *evt, *found_evt;
2160 union ibmvfc_iu rsp;
2161 int rsp_rc = -EBUSY;
2162 unsigned long flags;
2163 u16 status;
2164
2165 ENTER;
2166 spin_lock_irqsave(vhost->host->host_lock, flags);
2167 found_evt = NULL;
2168 list_for_each_entry(evt, &vhost->sent, queue) {
2169 if (evt->cmnd && evt->cmnd->device == sdev) {
2170 found_evt = evt;
2171 break;
2172 }
2173 }
2174
2175 if (!found_evt) {
2176 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2177 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2178 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2179 return 0;
2180 }
2181
2182 if (vhost->logged_in) {
2183 evt = ibmvfc_get_event(vhost);
2184 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2185
2186 tmf = &evt->iu.tmf;
2187 memset(tmf, 0, sizeof(*tmf));
2188 tmf->common.version = 1;
2189 tmf->common.opcode = IBMVFC_TMF_MAD;
2190 tmf->common.length = sizeof(*tmf);
2191 tmf->scsi_id = rport->port_id;
2192 int_to_scsilun(sdev->lun, &tmf->lun);
2193 if (!(vhost->login_buf->resp.capabilities & IBMVFC_CAN_SUPPRESS_ABTS))
2194 type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2195 if (vhost->state == IBMVFC_ACTIVE)
2196 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
2197 else
2198 tmf->flags = ((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID);
2199 tmf->cancel_key = (unsigned long)sdev->hostdata;
2200 tmf->my_cancel_key = (unsigned long)starget->hostdata;
2201
2202 evt->sync_iu = &rsp;
2203 init_completion(&evt->comp);
2204 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2205 }
2206
2207 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2208
2209 if (rsp_rc != 0) {
2210 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2211 /* If failure is received, the host adapter is most likely going
2212 through reset, return success so the caller will wait for the command
2213 being cancelled to get returned */
2214 return 0;
2215 }
2216
2217 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2218
2219 wait_for_completion(&evt->comp);
2220 status = rsp.mad_common.status;
2221 spin_lock_irqsave(vhost->host->host_lock, flags);
2222 ibmvfc_free_event(evt);
2223 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2224
2225 if (status != IBMVFC_MAD_SUCCESS) {
2226 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2227 switch (status) {
2228 case IBMVFC_MAD_DRIVER_FAILED:
2229 case IBMVFC_MAD_CRQ_ERROR:
2230 /* Host adapter most likely going through reset, return success to
2231 the caller will wait for the command being cancelled to get returned */
2232 return 0;
2233 default:
2234 return -EIO;
2235 };
2236 }
2237
2238 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2239 return 0;
2240 }
2241
2242 /**
2243 * ibmvfc_match_key - Match function for specified cancel key
2244 * @evt: ibmvfc event struct
2245 * @key: cancel key to match
2246 *
2247 * Returns:
2248 * 1 if event matches key / 0 if event does not match key
2249 **/
2250 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2251 {
2252 unsigned long cancel_key = (unsigned long)key;
2253
2254 if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2255 evt->iu.cmd.cancel_key == cancel_key)
2256 return 1;
2257 return 0;
2258 }
2259
2260 /**
2261 * ibmvfc_match_evt - Match function for specified event
2262 * @evt: ibmvfc event struct
2263 * @match: event to match
2264 *
2265 * Returns:
2266 * 1 if event matches key / 0 if event does not match key
2267 **/
2268 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2269 {
2270 if (evt == match)
2271 return 1;
2272 return 0;
2273 }
2274
2275 /**
2276 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2277 * @sdev: scsi device to abort commands
2278 *
2279 * This sends an Abort Task Set to the VIOS for the specified device. This does
2280 * NOT send any cancel to the VIOS. That must be done separately.
2281 *
2282 * Returns:
2283 * 0 on success / other on failure
2284 **/
2285 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2286 {
2287 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2288 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2289 struct ibmvfc_cmd *tmf;
2290 struct ibmvfc_event *evt, *found_evt;
2291 union ibmvfc_iu rsp_iu;
2292 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2293 int rc, rsp_rc = -EBUSY;
2294 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2295 int rsp_code = 0;
2296
2297 spin_lock_irqsave(vhost->host->host_lock, flags);
2298 found_evt = NULL;
2299 list_for_each_entry(evt, &vhost->sent, queue) {
2300 if (evt->cmnd && evt->cmnd->device == sdev) {
2301 found_evt = evt;
2302 break;
2303 }
2304 }
2305
2306 if (!found_evt) {
2307 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2308 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2309 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2310 return 0;
2311 }
2312
2313 if (vhost->state == IBMVFC_ACTIVE) {
2314 evt = ibmvfc_get_event(vhost);
2315 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2316
2317 tmf = &evt->iu.cmd;
2318 memset(tmf, 0, sizeof(*tmf));
2319 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
2320 tmf->resp.len = sizeof(tmf->rsp);
2321 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
2322 tmf->payload_len = sizeof(tmf->iu);
2323 tmf->resp_len = sizeof(tmf->rsp);
2324 tmf->cancel_key = (unsigned long)sdev->hostdata;
2325 tmf->tgt_scsi_id = rport->port_id;
2326 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2327 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
2328 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2329 evt->sync_iu = &rsp_iu;
2330
2331 init_completion(&evt->comp);
2332 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2333 }
2334
2335 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2336
2337 if (rsp_rc != 0) {
2338 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2339 return -EIO;
2340 }
2341
2342 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2343 timeout = wait_for_completion_timeout(&evt->comp, timeout);
2344
2345 if (!timeout) {
2346 rc = ibmvfc_cancel_all(sdev, 0);
2347 if (!rc) {
2348 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2349 if (rc == SUCCESS)
2350 rc = 0;
2351 }
2352
2353 if (rc) {
2354 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2355 ibmvfc_reset_host(vhost);
2356 rsp_rc = -EIO;
2357 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2358
2359 if (rc == SUCCESS)
2360 rsp_rc = 0;
2361
2362 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2363 if (rc != SUCCESS) {
2364 spin_lock_irqsave(vhost->host->host_lock, flags);
2365 ibmvfc_hard_reset_host(vhost);
2366 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2367 rsp_rc = 0;
2368 }
2369
2370 goto out;
2371 }
2372 }
2373
2374 if (rsp_iu.cmd.status)
2375 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2376
2377 if (rsp_code) {
2378 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2379 rsp_code = fc_rsp->data.info.rsp_code;
2380
2381 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2382 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2383 ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2384 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2385 fc_rsp->scsi_status);
2386 rsp_rc = -EIO;
2387 } else
2388 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2389
2390 out:
2391 spin_lock_irqsave(vhost->host->host_lock, flags);
2392 ibmvfc_free_event(evt);
2393 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2394 return rsp_rc;
2395 }
2396
2397 /**
2398 * ibmvfc_eh_abort_handler - Abort a command
2399 * @cmd: scsi command to abort
2400 *
2401 * Returns:
2402 * SUCCESS / FAST_IO_FAIL / FAILED
2403 **/
2404 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2405 {
2406 struct scsi_device *sdev = cmd->device;
2407 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2408 int cancel_rc, block_rc;
2409 int rc = FAILED;
2410
2411 ENTER;
2412 block_rc = fc_block_scsi_eh(cmd);
2413 ibmvfc_wait_while_resetting(vhost);
2414 if (block_rc != FAST_IO_FAIL) {
2415 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2416 ibmvfc_abort_task_set(sdev);
2417 } else
2418 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2419
2420 if (!cancel_rc)
2421 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2422
2423 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2424 rc = FAST_IO_FAIL;
2425
2426 LEAVE;
2427 return rc;
2428 }
2429
2430 /**
2431 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2432 * @cmd: scsi command struct
2433 *
2434 * Returns:
2435 * SUCCESS / FAST_IO_FAIL / FAILED
2436 **/
2437 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2438 {
2439 struct scsi_device *sdev = cmd->device;
2440 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2441 int cancel_rc, block_rc, reset_rc = 0;
2442 int rc = FAILED;
2443
2444 ENTER;
2445 block_rc = fc_block_scsi_eh(cmd);
2446 ibmvfc_wait_while_resetting(vhost);
2447 if (block_rc != FAST_IO_FAIL) {
2448 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2449 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2450 } else
2451 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2452
2453 if (!cancel_rc && !reset_rc)
2454 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2455
2456 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2457 rc = FAST_IO_FAIL;
2458
2459 LEAVE;
2460 return rc;
2461 }
2462
2463 /**
2464 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2465 * @sdev: scsi device struct
2466 * @data: return code
2467 *
2468 **/
2469 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2470 {
2471 unsigned long *rc = data;
2472 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2473 }
2474
2475 /**
2476 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2477 * @sdev: scsi device struct
2478 * @data: return code
2479 *
2480 **/
2481 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2482 {
2483 unsigned long *rc = data;
2484 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2485 }
2486
2487 /**
2488 * ibmvfc_eh_target_reset_handler - Reset the target
2489 * @cmd: scsi command struct
2490 *
2491 * Returns:
2492 * SUCCESS / FAST_IO_FAIL / FAILED
2493 **/
2494 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2495 {
2496 struct scsi_device *sdev = cmd->device;
2497 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2498 struct scsi_target *starget = scsi_target(sdev);
2499 int block_rc;
2500 int reset_rc = 0;
2501 int rc = FAILED;
2502 unsigned long cancel_rc = 0;
2503
2504 ENTER;
2505 block_rc = fc_block_scsi_eh(cmd);
2506 ibmvfc_wait_while_resetting(vhost);
2507 if (block_rc != FAST_IO_FAIL) {
2508 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2509 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2510 } else
2511 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2512
2513 if (!cancel_rc && !reset_rc)
2514 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2515
2516 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2517 rc = FAST_IO_FAIL;
2518
2519 LEAVE;
2520 return rc;
2521 }
2522
2523 /**
2524 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2525 * @cmd: struct scsi_cmnd having problems
2526 *
2527 **/
2528 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2529 {
2530 int rc, block_rc;
2531 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2532
2533 block_rc = fc_block_scsi_eh(cmd);
2534 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2535 rc = ibmvfc_issue_fc_host_lip(vhost->host);
2536
2537 if (block_rc == FAST_IO_FAIL)
2538 return FAST_IO_FAIL;
2539
2540 return rc ? FAILED : SUCCESS;
2541 }
2542
2543 /**
2544 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2545 * @rport: rport struct
2546 *
2547 * Return value:
2548 * none
2549 **/
2550 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2551 {
2552 struct Scsi_Host *shost = rport_to_shost(rport);
2553 struct ibmvfc_host *vhost = shost_priv(shost);
2554 struct fc_rport *dev_rport;
2555 struct scsi_device *sdev;
2556 unsigned long rc;
2557
2558 ENTER;
2559 shost_for_each_device(sdev, shost) {
2560 dev_rport = starget_to_rport(scsi_target(sdev));
2561 if (dev_rport != rport)
2562 continue;
2563 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2564 }
2565
2566 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2567
2568 if (rc == FAILED)
2569 ibmvfc_issue_fc_host_lip(shost);
2570 LEAVE;
2571 }
2572
2573 static const struct ibmvfc_async_desc ae_desc [] = {
2574 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2575 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2576 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2577 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2578 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2579 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL },
2580 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL },
2581 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL },
2582 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL },
2583 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL },
2584 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL },
2585 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL },
2586 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2587 };
2588
2589 static const struct ibmvfc_async_desc unknown_ae = {
2590 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2591 };
2592
2593 /**
2594 * ibmvfc_get_ae_desc - Get text description for async event
2595 * @ae: async event
2596 *
2597 **/
2598 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2599 {
2600 int i;
2601
2602 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2603 if (ae_desc[i].ae == ae)
2604 return &ae_desc[i];
2605
2606 return &unknown_ae;
2607 }
2608
2609 static const struct {
2610 enum ibmvfc_ae_link_state state;
2611 const char *desc;
2612 } link_desc [] = {
2613 { IBMVFC_AE_LS_LINK_UP, " link up" },
2614 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" },
2615 { IBMVFC_AE_LS_LINK_DOWN, " link down" },
2616 { IBMVFC_AE_LS_LINK_DEAD, " link dead" },
2617 };
2618
2619 /**
2620 * ibmvfc_get_link_state - Get text description for link state
2621 * @state: link state
2622 *
2623 **/
2624 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2625 {
2626 int i;
2627
2628 for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2629 if (link_desc[i].state == state)
2630 return link_desc[i].desc;
2631
2632 return "";
2633 }
2634
2635 /**
2636 * ibmvfc_handle_async - Handle an async event from the adapter
2637 * @crq: crq to process
2638 * @vhost: ibmvfc host struct
2639 *
2640 **/
2641 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2642 struct ibmvfc_host *vhost)
2643 {
2644 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(crq->event);
2645 struct ibmvfc_target *tgt;
2646
2647 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2648 " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
2649 ibmvfc_get_link_state(crq->link_state));
2650
2651 switch (crq->event) {
2652 case IBMVFC_AE_RESUME:
2653 switch (crq->link_state) {
2654 case IBMVFC_AE_LS_LINK_DOWN:
2655 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2656 break;
2657 case IBMVFC_AE_LS_LINK_DEAD:
2658 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2659 break;
2660 case IBMVFC_AE_LS_LINK_UP:
2661 case IBMVFC_AE_LS_LINK_BOUNCED:
2662 default:
2663 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2664 vhost->delay_init = 1;
2665 __ibmvfc_reset_host(vhost);
2666 break;
2667 };
2668
2669 break;
2670 case IBMVFC_AE_LINK_UP:
2671 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2672 vhost->delay_init = 1;
2673 __ibmvfc_reset_host(vhost);
2674 break;
2675 case IBMVFC_AE_SCN_FABRIC:
2676 case IBMVFC_AE_SCN_DOMAIN:
2677 vhost->events_to_log |= IBMVFC_AE_RSCN;
2678 if (vhost->state < IBMVFC_HALTED) {
2679 vhost->delay_init = 1;
2680 __ibmvfc_reset_host(vhost);
2681 }
2682 break;
2683 case IBMVFC_AE_SCN_NPORT:
2684 case IBMVFC_AE_SCN_GROUP:
2685 vhost->events_to_log |= IBMVFC_AE_RSCN;
2686 ibmvfc_reinit_host(vhost);
2687 break;
2688 case IBMVFC_AE_ELS_LOGO:
2689 case IBMVFC_AE_ELS_PRLO:
2690 case IBMVFC_AE_ELS_PLOGI:
2691 list_for_each_entry(tgt, &vhost->targets, queue) {
2692 if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2693 break;
2694 if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
2695 continue;
2696 if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
2697 continue;
2698 if (crq->node_name && tgt->ids.node_name != crq->node_name)
2699 continue;
2700 if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
2701 tgt->logo_rcvd = 1;
2702 if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
2703 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2704 ibmvfc_reinit_host(vhost);
2705 }
2706 }
2707 break;
2708 case IBMVFC_AE_LINK_DOWN:
2709 case IBMVFC_AE_ADAPTER_FAILED:
2710 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2711 break;
2712 case IBMVFC_AE_LINK_DEAD:
2713 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2714 break;
2715 case IBMVFC_AE_HALT:
2716 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2717 break;
2718 default:
2719 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2720 break;
2721 };
2722 }
2723
2724 /**
2725 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2726 * @crq: Command/Response queue
2727 * @vhost: ibmvfc host struct
2728 *
2729 **/
2730 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2731 {
2732 long rc;
2733 struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2734
2735 switch (crq->valid) {
2736 case IBMVFC_CRQ_INIT_RSP:
2737 switch (crq->format) {
2738 case IBMVFC_CRQ_INIT:
2739 dev_info(vhost->dev, "Partner initialized\n");
2740 /* Send back a response */
2741 rc = ibmvfc_send_crq_init_complete(vhost);
2742 if (rc == 0)
2743 ibmvfc_init_host(vhost);
2744 else
2745 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2746 break;
2747 case IBMVFC_CRQ_INIT_COMPLETE:
2748 dev_info(vhost->dev, "Partner initialization complete\n");
2749 ibmvfc_init_host(vhost);
2750 break;
2751 default:
2752 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2753 }
2754 return;
2755 case IBMVFC_CRQ_XPORT_EVENT:
2756 vhost->state = IBMVFC_NO_CRQ;
2757 vhost->logged_in = 0;
2758 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2759 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2760 /* We need to re-setup the interpartition connection */
2761 dev_info(vhost->dev, "Re-enabling adapter\n");
2762 vhost->client_migrated = 1;
2763 ibmvfc_purge_requests(vhost, DID_REQUEUE);
2764 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2765 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2766 } else {
2767 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2768 ibmvfc_purge_requests(vhost, DID_ERROR);
2769 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2770 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2771 }
2772 return;
2773 case IBMVFC_CRQ_CMD_RSP:
2774 break;
2775 default:
2776 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2777 return;
2778 }
2779
2780 if (crq->format == IBMVFC_ASYNC_EVENT)
2781 return;
2782
2783 /* The only kind of payload CRQs we should get are responses to
2784 * things we send. Make sure this response is to something we
2785 * actually sent
2786 */
2787 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2788 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2789 crq->ioba);
2790 return;
2791 }
2792
2793 if (unlikely(atomic_read(&evt->free))) {
2794 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2795 crq->ioba);
2796 return;
2797 }
2798
2799 del_timer(&evt->timer);
2800 list_del(&evt->queue);
2801 ibmvfc_trc_end(evt);
2802 evt->done(evt);
2803 }
2804
2805 /**
2806 * ibmvfc_scan_finished - Check if the device scan is done.
2807 * @shost: scsi host struct
2808 * @time: current elapsed time
2809 *
2810 * Returns:
2811 * 0 if scan is not done / 1 if scan is done
2812 **/
2813 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2814 {
2815 unsigned long flags;
2816 struct ibmvfc_host *vhost = shost_priv(shost);
2817 int done = 0;
2818
2819 spin_lock_irqsave(shost->host_lock, flags);
2820 if (time >= (init_timeout * HZ)) {
2821 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2822 "continuing initialization\n", init_timeout);
2823 done = 1;
2824 }
2825
2826 if (vhost->scan_complete)
2827 done = 1;
2828 spin_unlock_irqrestore(shost->host_lock, flags);
2829 return done;
2830 }
2831
2832 /**
2833 * ibmvfc_slave_alloc - Setup the device's task set value
2834 * @sdev: struct scsi_device device to configure
2835 *
2836 * Set the device's task set value so that error handling works as
2837 * expected.
2838 *
2839 * Returns:
2840 * 0 on success / -ENXIO if device does not exist
2841 **/
2842 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2843 {
2844 struct Scsi_Host *shost = sdev->host;
2845 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2846 struct ibmvfc_host *vhost = shost_priv(shost);
2847 unsigned long flags = 0;
2848
2849 if (!rport || fc_remote_port_chkready(rport))
2850 return -ENXIO;
2851
2852 spin_lock_irqsave(shost->host_lock, flags);
2853 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2854 spin_unlock_irqrestore(shost->host_lock, flags);
2855 return 0;
2856 }
2857
2858 /**
2859 * ibmvfc_target_alloc - Setup the target's task set value
2860 * @starget: struct scsi_target
2861 *
2862 * Set the target's task set value so that error handling works as
2863 * expected.
2864 *
2865 * Returns:
2866 * 0 on success / -ENXIO if device does not exist
2867 **/
2868 static int ibmvfc_target_alloc(struct scsi_target *starget)
2869 {
2870 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2871 struct ibmvfc_host *vhost = shost_priv(shost);
2872 unsigned long flags = 0;
2873
2874 spin_lock_irqsave(shost->host_lock, flags);
2875 starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2876 spin_unlock_irqrestore(shost->host_lock, flags);
2877 return 0;
2878 }
2879
2880 /**
2881 * ibmvfc_slave_configure - Configure the device
2882 * @sdev: struct scsi_device device to configure
2883 *
2884 * Enable allow_restart for a device if it is a disk. Adjust the
2885 * queue_depth here also.
2886 *
2887 * Returns:
2888 * 0
2889 **/
2890 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2891 {
2892 struct Scsi_Host *shost = sdev->host;
2893 unsigned long flags = 0;
2894
2895 spin_lock_irqsave(shost->host_lock, flags);
2896 if (sdev->type == TYPE_DISK)
2897 sdev->allow_restart = 1;
2898
2899 if (sdev->tagged_supported) {
2900 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2901 scsi_activate_tcq(sdev, sdev->queue_depth);
2902 } else
2903 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2904 spin_unlock_irqrestore(shost->host_lock, flags);
2905 return 0;
2906 }
2907
2908 /**
2909 * ibmvfc_change_queue_depth - Change the device's queue depth
2910 * @sdev: scsi device struct
2911 * @qdepth: depth to set
2912 * @reason: calling context
2913 *
2914 * Return value:
2915 * actual depth set
2916 **/
2917 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
2918 int reason)
2919 {
2920 if (reason != SCSI_QDEPTH_DEFAULT)
2921 return -EOPNOTSUPP;
2922
2923 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2924 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2925
2926 scsi_adjust_queue_depth(sdev, 0, qdepth);
2927 return sdev->queue_depth;
2928 }
2929
2930 /**
2931 * ibmvfc_change_queue_type - Change the device's queue type
2932 * @sdev: scsi device struct
2933 * @tag_type: type of tags to use
2934 *
2935 * Return value:
2936 * actual queue type set
2937 **/
2938 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2939 {
2940 if (sdev->tagged_supported) {
2941 scsi_set_tag_type(sdev, tag_type);
2942
2943 if (tag_type)
2944 scsi_activate_tcq(sdev, sdev->queue_depth);
2945 else
2946 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2947 } else
2948 tag_type = 0;
2949
2950 return tag_type;
2951 }
2952
2953 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2954 struct device_attribute *attr, char *buf)
2955 {
2956 struct Scsi_Host *shost = class_to_shost(dev);
2957 struct ibmvfc_host *vhost = shost_priv(shost);
2958
2959 return snprintf(buf, PAGE_SIZE, "%s\n",
2960 vhost->login_buf->resp.partition_name);
2961 }
2962
2963 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2964 struct device_attribute *attr, char *buf)
2965 {
2966 struct Scsi_Host *shost = class_to_shost(dev);
2967 struct ibmvfc_host *vhost = shost_priv(shost);
2968
2969 return snprintf(buf, PAGE_SIZE, "%s\n",
2970 vhost->login_buf->resp.device_name);
2971 }
2972
2973 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2974 struct device_attribute *attr, char *buf)
2975 {
2976 struct Scsi_Host *shost = class_to_shost(dev);
2977 struct ibmvfc_host *vhost = shost_priv(shost);
2978
2979 return snprintf(buf, PAGE_SIZE, "%s\n",
2980 vhost->login_buf->resp.port_loc_code);
2981 }
2982
2983 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2984 struct device_attribute *attr, char *buf)
2985 {
2986 struct Scsi_Host *shost = class_to_shost(dev);
2987 struct ibmvfc_host *vhost = shost_priv(shost);
2988
2989 return snprintf(buf, PAGE_SIZE, "%s\n",
2990 vhost->login_buf->resp.drc_name);
2991 }
2992
2993 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2994 struct device_attribute *attr, char *buf)
2995 {
2996 struct Scsi_Host *shost = class_to_shost(dev);
2997 struct ibmvfc_host *vhost = shost_priv(shost);
2998 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2999 }
3000
3001 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3002 struct device_attribute *attr, char *buf)
3003 {
3004 struct Scsi_Host *shost = class_to_shost(dev);
3005 struct ibmvfc_host *vhost = shost_priv(shost);
3006 return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
3007 }
3008
3009 /**
3010 * ibmvfc_show_log_level - Show the adapter's error logging level
3011 * @dev: class device struct
3012 * @buf: buffer
3013 *
3014 * Return value:
3015 * number of bytes printed to buffer
3016 **/
3017 static ssize_t ibmvfc_show_log_level(struct device *dev,
3018 struct device_attribute *attr, char *buf)
3019 {
3020 struct Scsi_Host *shost = class_to_shost(dev);
3021 struct ibmvfc_host *vhost = shost_priv(shost);
3022 unsigned long flags = 0;
3023 int len;
3024
3025 spin_lock_irqsave(shost->host_lock, flags);
3026 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
3027 spin_unlock_irqrestore(shost->host_lock, flags);
3028 return len;
3029 }
3030
3031 /**
3032 * ibmvfc_store_log_level - Change the adapter's error logging level
3033 * @dev: class device struct
3034 * @buf: buffer
3035 *
3036 * Return value:
3037 * number of bytes printed to buffer
3038 **/
3039 static ssize_t ibmvfc_store_log_level(struct device *dev,
3040 struct device_attribute *attr,
3041 const char *buf, size_t count)
3042 {
3043 struct Scsi_Host *shost = class_to_shost(dev);
3044 struct ibmvfc_host *vhost = shost_priv(shost);
3045 unsigned long flags = 0;
3046
3047 spin_lock_irqsave(shost->host_lock, flags);
3048 vhost->log_level = simple_strtoul(buf, NULL, 10);
3049 spin_unlock_irqrestore(shost->host_lock, flags);
3050 return strlen(buf);
3051 }
3052
3053 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3054 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3055 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3056 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3057 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3058 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3059 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3060 ibmvfc_show_log_level, ibmvfc_store_log_level);
3061
3062 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3063 /**
3064 * ibmvfc_read_trace - Dump the adapter trace
3065 * @filp: open sysfs file
3066 * @kobj: kobject struct
3067 * @bin_attr: bin_attribute struct
3068 * @buf: buffer
3069 * @off: offset
3070 * @count: buffer size
3071 *
3072 * Return value:
3073 * number of bytes printed to buffer
3074 **/
3075 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3076 struct bin_attribute *bin_attr,
3077 char *buf, loff_t off, size_t count)
3078 {
3079 struct device *dev = container_of(kobj, struct device, kobj);
3080 struct Scsi_Host *shost = class_to_shost(dev);
3081 struct ibmvfc_host *vhost = shost_priv(shost);
3082 unsigned long flags = 0;
3083 int size = IBMVFC_TRACE_SIZE;
3084 char *src = (char *)vhost->trace;
3085
3086 if (off > size)
3087 return 0;
3088 if (off + count > size) {
3089 size -= off;
3090 count = size;
3091 }
3092
3093 spin_lock_irqsave(shost->host_lock, flags);
3094 memcpy(buf, &src[off], count);
3095 spin_unlock_irqrestore(shost->host_lock, flags);
3096 return count;
3097 }
3098
3099 static struct bin_attribute ibmvfc_trace_attr = {
3100 .attr = {
3101 .name = "trace",
3102 .mode = S_IRUGO,
3103 },
3104 .size = 0,
3105 .read = ibmvfc_read_trace,
3106 };
3107 #endif
3108
3109 static struct device_attribute *ibmvfc_attrs[] = {
3110 &dev_attr_partition_name,
3111 &dev_attr_device_name,
3112 &dev_attr_port_loc_code,
3113 &dev_attr_drc_name,
3114 &dev_attr_npiv_version,
3115 &dev_attr_capabilities,
3116 &dev_attr_log_level,
3117 NULL
3118 };
3119
3120 static struct scsi_host_template driver_template = {
3121 .module = THIS_MODULE,
3122 .name = "IBM POWER Virtual FC Adapter",
3123 .proc_name = IBMVFC_NAME,
3124 .queuecommand = ibmvfc_queuecommand,
3125 .eh_abort_handler = ibmvfc_eh_abort_handler,
3126 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3127 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3128 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3129 .slave_alloc = ibmvfc_slave_alloc,
3130 .slave_configure = ibmvfc_slave_configure,
3131 .target_alloc = ibmvfc_target_alloc,
3132 .scan_finished = ibmvfc_scan_finished,
3133 .change_queue_depth = ibmvfc_change_queue_depth,
3134 .change_queue_type = ibmvfc_change_queue_type,
3135 .cmd_per_lun = 16,
3136 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3137 .this_id = -1,
3138 .sg_tablesize = SG_ALL,
3139 .max_sectors = IBMVFC_MAX_SECTORS,
3140 .use_clustering = ENABLE_CLUSTERING,
3141 .shost_attrs = ibmvfc_attrs,
3142 };
3143
3144 /**
3145 * ibmvfc_next_async_crq - Returns the next entry in async queue
3146 * @vhost: ibmvfc host struct
3147 *
3148 * Returns:
3149 * Pointer to next entry in queue / NULL if empty
3150 **/
3151 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3152 {
3153 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3154 struct ibmvfc_async_crq *crq;
3155
3156 crq = &async_crq->msgs[async_crq->cur];
3157 if (crq->valid & 0x80) {
3158 if (++async_crq->cur == async_crq->size)
3159 async_crq->cur = 0;
3160 rmb();
3161 } else
3162 crq = NULL;
3163
3164 return crq;
3165 }
3166
3167 /**
3168 * ibmvfc_next_crq - Returns the next entry in message queue
3169 * @vhost: ibmvfc host struct
3170 *
3171 * Returns:
3172 * Pointer to next entry in queue / NULL if empty
3173 **/
3174 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3175 {
3176 struct ibmvfc_crq_queue *queue = &vhost->crq;
3177 struct ibmvfc_crq *crq;
3178
3179 crq = &queue->msgs[queue->cur];
3180 if (crq->valid & 0x80) {
3181 if (++queue->cur == queue->size)
3182 queue->cur = 0;
3183 rmb();
3184 } else
3185 crq = NULL;
3186
3187 return crq;
3188 }
3189
3190 /**
3191 * ibmvfc_interrupt - Interrupt handler
3192 * @irq: number of irq to handle, not used
3193 * @dev_instance: ibmvfc_host that received interrupt
3194 *
3195 * Returns:
3196 * IRQ_HANDLED
3197 **/
3198 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3199 {
3200 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3201 unsigned long flags;
3202
3203 spin_lock_irqsave(vhost->host->host_lock, flags);
3204 vio_disable_interrupts(to_vio_dev(vhost->dev));
3205 tasklet_schedule(&vhost->tasklet);
3206 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3207 return IRQ_HANDLED;
3208 }
3209
3210 /**
3211 * ibmvfc_tasklet - Interrupt handler tasklet
3212 * @data: ibmvfc host struct
3213 *
3214 * Returns:
3215 * Nothing
3216 **/
3217 static void ibmvfc_tasklet(void *data)
3218 {
3219 struct ibmvfc_host *vhost = data;
3220 struct vio_dev *vdev = to_vio_dev(vhost->dev);
3221 struct ibmvfc_crq *crq;
3222 struct ibmvfc_async_crq *async;
3223 unsigned long flags;
3224 int done = 0;
3225
3226 spin_lock_irqsave(vhost->host->host_lock, flags);
3227 while (!done) {
3228 /* Pull all the valid messages off the async CRQ */
3229 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3230 ibmvfc_handle_async(async, vhost);
3231 async->valid = 0;
3232 wmb();
3233 }
3234
3235 /* Pull all the valid messages off the CRQ */
3236 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3237 ibmvfc_handle_crq(crq, vhost);
3238 crq->valid = 0;
3239 wmb();
3240 }
3241
3242 vio_enable_interrupts(vdev);
3243 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3244 vio_disable_interrupts(vdev);
3245 ibmvfc_handle_async(async, vhost);
3246 async->valid = 0;
3247 wmb();
3248 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3249 vio_disable_interrupts(vdev);
3250 ibmvfc_handle_crq(crq, vhost);
3251 crq->valid = 0;
3252 wmb();
3253 } else
3254 done = 1;
3255 }
3256
3257 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3258 }
3259
3260 /**
3261 * ibmvfc_init_tgt - Set the next init job step for the target
3262 * @tgt: ibmvfc target struct
3263 * @job_step: job step to perform
3264 *
3265 **/
3266 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3267 void (*job_step) (struct ibmvfc_target *))
3268 {
3269 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3270 tgt->job_step = job_step;
3271 wake_up(&tgt->vhost->work_wait_q);
3272 }
3273
3274 /**
3275 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3276 * @tgt: ibmvfc target struct
3277 * @job_step: initialization job step
3278 *
3279 * Returns: 1 if step will be retried / 0 if not
3280 *
3281 **/
3282 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3283 void (*job_step) (struct ibmvfc_target *))
3284 {
3285 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3286 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3287 wake_up(&tgt->vhost->work_wait_q);
3288 return 0;
3289 } else
3290 ibmvfc_init_tgt(tgt, job_step);
3291 return 1;
3292 }
3293
3294 /* Defined in FC-LS */
3295 static const struct {
3296 int code;
3297 int retry;
3298 int logged_in;
3299 } prli_rsp [] = {
3300 { 0, 1, 0 },
3301 { 1, 0, 1 },
3302 { 2, 1, 0 },
3303 { 3, 1, 0 },
3304 { 4, 0, 0 },
3305 { 5, 0, 0 },
3306 { 6, 0, 1 },
3307 { 7, 0, 0 },
3308 { 8, 1, 0 },
3309 };
3310
3311 /**
3312 * ibmvfc_get_prli_rsp - Find PRLI response index
3313 * @flags: PRLI response flags
3314 *
3315 **/
3316 static int ibmvfc_get_prli_rsp(u16 flags)
3317 {
3318 int i;
3319 int code = (flags & 0x0f00) >> 8;
3320
3321 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3322 if (prli_rsp[i].code == code)
3323 return i;
3324
3325 return 0;
3326 }
3327
3328 /**
3329 * ibmvfc_tgt_prli_done - Completion handler for Process Login
3330 * @evt: ibmvfc event struct
3331 *
3332 **/
3333 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3334 {
3335 struct ibmvfc_target *tgt = evt->tgt;
3336 struct ibmvfc_host *vhost = evt->vhost;
3337 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3338 struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3339 u32 status = rsp->common.status;
3340 int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3341
3342 vhost->discovery_threads--;
3343 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3344 switch (status) {
3345 case IBMVFC_MAD_SUCCESS:
3346 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3347 parms->type, parms->flags, parms->service_parms);
3348
3349 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3350 index = ibmvfc_get_prli_rsp(parms->flags);
3351 if (prli_rsp[index].logged_in) {
3352 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
3353 tgt->need_login = 0;
3354 tgt->ids.roles = 0;
3355 if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
3356 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3357 if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
3358 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3359 tgt->add_rport = 1;
3360 } else
3361 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3362 } else if (prli_rsp[index].retry)
3363 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3364 else
3365 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3366 } else
3367 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3368 break;
3369 case IBMVFC_MAD_DRIVER_FAILED:
3370 break;
3371 case IBMVFC_MAD_CRQ_ERROR:
3372 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3373 break;
3374 case IBMVFC_MAD_FAILED:
3375 default:
3376 if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
3377 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3378 else if (tgt->logo_rcvd)
3379 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3380 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3381 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3382 else
3383 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3384
3385 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3386 ibmvfc_get_cmd_error(rsp->status, rsp->error),
3387 rsp->status, rsp->error, status);
3388 break;
3389 };
3390
3391 kref_put(&tgt->kref, ibmvfc_release_tgt);
3392 ibmvfc_free_event(evt);
3393 wake_up(&vhost->work_wait_q);
3394 }
3395
3396 /**
3397 * ibmvfc_tgt_send_prli - Send a process login
3398 * @tgt: ibmvfc target struct
3399 *
3400 **/
3401 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3402 {
3403 struct ibmvfc_process_login *prli;
3404 struct ibmvfc_host *vhost = tgt->vhost;
3405 struct ibmvfc_event *evt;
3406
3407 if (vhost->discovery_threads >= disc_threads)
3408 return;
3409
3410 kref_get(&tgt->kref);
3411 evt = ibmvfc_get_event(vhost);
3412 vhost->discovery_threads++;
3413 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3414 evt->tgt = tgt;
3415 prli = &evt->iu.prli;
3416 memset(prli, 0, sizeof(*prli));
3417 prli->common.version = 1;
3418 prli->common.opcode = IBMVFC_PROCESS_LOGIN;
3419 prli->common.length = sizeof(*prli);
3420 prli->scsi_id = tgt->scsi_id;
3421
3422 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3423 prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
3424 prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
3425
3426 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3427 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3428 vhost->discovery_threads--;
3429 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3430 kref_put(&tgt->kref, ibmvfc_release_tgt);
3431 } else
3432 tgt_dbg(tgt, "Sent process login\n");
3433 }
3434
3435 /**
3436 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3437 * @evt: ibmvfc event struct
3438 *
3439 **/
3440 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3441 {
3442 struct ibmvfc_target *tgt = evt->tgt;
3443 struct ibmvfc_host *vhost = evt->vhost;
3444 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3445 u32 status = rsp->common.status;
3446 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3447
3448 vhost->discovery_threads--;
3449 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3450 switch (status) {
3451 case IBMVFC_MAD_SUCCESS:
3452 tgt_dbg(tgt, "Port Login succeeded\n");
3453 if (tgt->ids.port_name &&
3454 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3455 vhost->reinit = 1;
3456 tgt_dbg(tgt, "Port re-init required\n");
3457 break;
3458 }
3459 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3460 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3461 tgt->ids.port_id = tgt->scsi_id;
3462 memcpy(&tgt->service_parms, &rsp->service_parms,
3463 sizeof(tgt->service_parms));
3464 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3465 sizeof(tgt->service_parms_change));
3466 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3467 break;
3468 case IBMVFC_MAD_DRIVER_FAILED:
3469 break;
3470 case IBMVFC_MAD_CRQ_ERROR:
3471 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3472 break;
3473 case IBMVFC_MAD_FAILED:
3474 default:
3475 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3476 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3477 else
3478 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3479
3480 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3481 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3482 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3483 ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
3484 break;
3485 };
3486
3487 kref_put(&tgt->kref, ibmvfc_release_tgt);
3488 ibmvfc_free_event(evt);
3489 wake_up(&vhost->work_wait_q);
3490 }
3491
3492 /**
3493 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3494 * @tgt: ibmvfc target struct
3495 *
3496 **/
3497 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3498 {
3499 struct ibmvfc_port_login *plogi;
3500 struct ibmvfc_host *vhost = tgt->vhost;
3501 struct ibmvfc_event *evt;
3502
3503 if (vhost->discovery_threads >= disc_threads)
3504 return;
3505
3506 kref_get(&tgt->kref);
3507 tgt->logo_rcvd = 0;
3508 evt = ibmvfc_get_event(vhost);
3509 vhost->discovery_threads++;
3510 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3511 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3512 evt->tgt = tgt;
3513 plogi = &evt->iu.plogi;
3514 memset(plogi, 0, sizeof(*plogi));
3515 plogi->common.version = 1;
3516 plogi->common.opcode = IBMVFC_PORT_LOGIN;
3517 plogi->common.length = sizeof(*plogi);
3518 plogi->scsi_id = tgt->scsi_id;
3519
3520 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3521 vhost->discovery_threads--;
3522 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3523 kref_put(&tgt->kref, ibmvfc_release_tgt);
3524 } else
3525 tgt_dbg(tgt, "Sent port login\n");
3526 }
3527
3528 /**
3529 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3530 * @evt: ibmvfc event struct
3531 *
3532 **/
3533 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3534 {
3535 struct ibmvfc_target *tgt = evt->tgt;
3536 struct ibmvfc_host *vhost = evt->vhost;
3537 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3538 u32 status = rsp->common.status;
3539
3540 vhost->discovery_threads--;
3541 ibmvfc_free_event(evt);
3542 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3543
3544 switch (status) {
3545 case IBMVFC_MAD_SUCCESS:
3546 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3547 break;
3548 case IBMVFC_MAD_DRIVER_FAILED:
3549 kref_put(&tgt->kref, ibmvfc_release_tgt);
3550 wake_up(&vhost->work_wait_q);
3551 return;
3552 case IBMVFC_MAD_FAILED:
3553 default:
3554 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3555 break;
3556 };
3557
3558 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3559 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3560 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3561 tgt->scsi_id != tgt->new_scsi_id)
3562 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3563 kref_put(&tgt->kref, ibmvfc_release_tgt);
3564 wake_up(&vhost->work_wait_q);
3565 }
3566
3567 /**
3568 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3569 * @tgt: ibmvfc target struct
3570 *
3571 **/
3572 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3573 {
3574 struct ibmvfc_implicit_logout *mad;
3575 struct ibmvfc_host *vhost = tgt->vhost;
3576 struct ibmvfc_event *evt;
3577
3578 if (vhost->discovery_threads >= disc_threads)
3579 return;
3580
3581 kref_get(&tgt->kref);
3582 evt = ibmvfc_get_event(vhost);
3583 vhost->discovery_threads++;
3584 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3585 evt->tgt = tgt;
3586 mad = &evt->iu.implicit_logout;
3587 memset(mad, 0, sizeof(*mad));
3588 mad->common.version = 1;
3589 mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
3590 mad->common.length = sizeof(*mad);
3591 mad->old_scsi_id = tgt->scsi_id;
3592
3593 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3594 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3595 vhost->discovery_threads--;
3596 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3597 kref_put(&tgt->kref, ibmvfc_release_tgt);
3598 } else
3599 tgt_dbg(tgt, "Sent Implicit Logout\n");
3600 }
3601
3602 /**
3603 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3604 * @mad: ibmvfc passthru mad struct
3605 * @tgt: ibmvfc target struct
3606 *
3607 * Returns:
3608 * 1 if PLOGI needed / 0 if PLOGI not needed
3609 **/
3610 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3611 struct ibmvfc_target *tgt)
3612 {
3613 if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3614 sizeof(tgt->ids.port_name)))
3615 return 1;
3616 if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3617 sizeof(tgt->ids.node_name)))
3618 return 1;
3619 if (mad->fc_iu.response[6] != tgt->scsi_id)
3620 return 1;
3621 return 0;
3622 }
3623
3624 /**
3625 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3626 * @evt: ibmvfc event struct
3627 *
3628 **/
3629 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3630 {
3631 struct ibmvfc_target *tgt = evt->tgt;
3632 struct ibmvfc_host *vhost = evt->vhost;
3633 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3634 u32 status = mad->common.status;
3635 u8 fc_reason, fc_explain;
3636
3637 vhost->discovery_threads--;
3638 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3639 del_timer(&tgt->timer);
3640
3641 switch (status) {
3642 case IBMVFC_MAD_SUCCESS:
3643 tgt_dbg(tgt, "ADISC succeeded\n");
3644 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3645 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3646 break;
3647 case IBMVFC_MAD_DRIVER_FAILED:
3648 break;
3649 case IBMVFC_MAD_FAILED:
3650 default:
3651 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3652 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
3653 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
3654 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3655 ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
3656 mad->iu.status, mad->iu.error,
3657 ibmvfc_get_fc_type(fc_reason), fc_reason,
3658 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3659 break;
3660 };
3661
3662 kref_put(&tgt->kref, ibmvfc_release_tgt);
3663 ibmvfc_free_event(evt);
3664 wake_up(&vhost->work_wait_q);
3665 }
3666
3667 /**
3668 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3669 * @evt: ibmvfc event struct
3670 *
3671 **/
3672 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3673 {
3674 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3675
3676 memset(mad, 0, sizeof(*mad));
3677 mad->common.version = 1;
3678 mad->common.opcode = IBMVFC_PASSTHRU;
3679 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
3680 mad->cmd_ioba.va = (u64)evt->crq.ioba +
3681 offsetof(struct ibmvfc_passthru_mad, iu);
3682 mad->cmd_ioba.len = sizeof(mad->iu);
3683 mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
3684 mad->iu.rsp_len = sizeof(mad->fc_iu.response);
3685 mad->iu.cmd.va = (u64)evt->crq.ioba +
3686 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3687 offsetof(struct ibmvfc_passthru_fc_iu, payload);
3688 mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
3689 mad->iu.rsp.va = (u64)evt->crq.ioba +
3690 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3691 offsetof(struct ibmvfc_passthru_fc_iu, response);
3692 mad->iu.rsp.len = sizeof(mad->fc_iu.response);
3693 }
3694
3695 /**
3696 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3697 * @evt: ibmvfc event struct
3698 *
3699 * Just cleanup this event struct. Everything else is handled by
3700 * the ADISC completion handler. If the ADISC never actually comes
3701 * back, we still have the timer running on the ADISC event struct
3702 * which will fire and cause the CRQ to get reset.
3703 *
3704 **/
3705 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3706 {
3707 struct ibmvfc_host *vhost = evt->vhost;
3708 struct ibmvfc_target *tgt = evt->tgt;
3709
3710 tgt_dbg(tgt, "ADISC cancel complete\n");
3711 vhost->abort_threads--;
3712 ibmvfc_free_event(evt);
3713 kref_put(&tgt->kref, ibmvfc_release_tgt);
3714 wake_up(&vhost->work_wait_q);
3715 }
3716
3717 /**
3718 * ibmvfc_adisc_timeout - Handle an ADISC timeout
3719 * @tgt: ibmvfc target struct
3720 *
3721 * If an ADISC times out, send a cancel. If the cancel times
3722 * out, reset the CRQ. When the ADISC comes back as cancelled,
3723 * log back into the target.
3724 **/
3725 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3726 {
3727 struct ibmvfc_host *vhost = tgt->vhost;
3728 struct ibmvfc_event *evt;
3729 struct ibmvfc_tmf *tmf;
3730 unsigned long flags;
3731 int rc;
3732
3733 tgt_dbg(tgt, "ADISC timeout\n");
3734 spin_lock_irqsave(vhost->host->host_lock, flags);
3735 if (vhost->abort_threads >= disc_threads ||
3736 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3737 vhost->state != IBMVFC_INITIALIZING ||
3738 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3739 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3740 return;
3741 }
3742
3743 vhost->abort_threads++;
3744 kref_get(&tgt->kref);
3745 evt = ibmvfc_get_event(vhost);
3746 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3747
3748 evt->tgt = tgt;
3749 tmf = &evt->iu.tmf;
3750 memset(tmf, 0, sizeof(*tmf));
3751 tmf->common.version = 1;
3752 tmf->common.opcode = IBMVFC_TMF_MAD;
3753 tmf->common.length = sizeof(*tmf);
3754 tmf->scsi_id = tgt->scsi_id;
3755 tmf->cancel_key = tgt->cancel_key;
3756
3757 rc = ibmvfc_send_event(evt, vhost, default_timeout);
3758
3759 if (rc) {
3760 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3761 vhost->abort_threads--;
3762 kref_put(&tgt->kref, ibmvfc_release_tgt);
3763 __ibmvfc_reset_host(vhost);
3764 } else
3765 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3766 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3767 }
3768
3769 /**
3770 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3771 * @tgt: ibmvfc target struct
3772 *
3773 * When sending an ADISC we end up with two timers running. The
3774 * first timer is the timer in the ibmvfc target struct. If this
3775 * fires, we send a cancel to the target. The second timer is the
3776 * timer on the ibmvfc event for the ADISC, which is longer. If that
3777 * fires, it means the ADISC timed out and our attempt to cancel it
3778 * also failed, so we need to reset the CRQ.
3779 **/
3780 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3781 {
3782 struct ibmvfc_passthru_mad *mad;
3783 struct ibmvfc_host *vhost = tgt->vhost;
3784 struct ibmvfc_event *evt;
3785
3786 if (vhost->discovery_threads >= disc_threads)
3787 return;
3788
3789 kref_get(&tgt->kref);
3790 evt = ibmvfc_get_event(vhost);
3791 vhost->discovery_threads++;
3792 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3793 evt->tgt = tgt;
3794
3795 ibmvfc_init_passthru(evt);
3796 mad = &evt->iu.passthru;
3797 mad->iu.flags = IBMVFC_FC_ELS;
3798 mad->iu.scsi_id = tgt->scsi_id;
3799 mad->iu.cancel_key = tgt->cancel_key;
3800
3801 mad->fc_iu.payload[0] = IBMVFC_ADISC;
3802 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3803 sizeof(vhost->login_buf->resp.port_name));
3804 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3805 sizeof(vhost->login_buf->resp.node_name));
3806 mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
3807
3808 if (timer_pending(&tgt->timer))
3809 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3810 else {
3811 tgt->timer.data = (unsigned long) tgt;
3812 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3813 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3814 add_timer(&tgt->timer);
3815 }
3816
3817 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3818 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3819 vhost->discovery_threads--;
3820 del_timer(&tgt->timer);
3821 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3822 kref_put(&tgt->kref, ibmvfc_release_tgt);
3823 } else
3824 tgt_dbg(tgt, "Sent ADISC\n");
3825 }
3826
3827 /**
3828 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3829 * @evt: ibmvfc event struct
3830 *
3831 **/
3832 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3833 {
3834 struct ibmvfc_target *tgt = evt->tgt;
3835 struct ibmvfc_host *vhost = evt->vhost;
3836 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3837 u32 status = rsp->common.status;
3838 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3839
3840 vhost->discovery_threads--;
3841 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3842 switch (status) {
3843 case IBMVFC_MAD_SUCCESS:
3844 tgt_dbg(tgt, "Query Target succeeded\n");
3845 tgt->new_scsi_id = rsp->scsi_id;
3846 if (rsp->scsi_id != tgt->scsi_id)
3847 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3848 else
3849 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3850 break;
3851 case IBMVFC_MAD_DRIVER_FAILED:
3852 break;
3853 case IBMVFC_MAD_CRQ_ERROR:
3854 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3855 break;
3856 case IBMVFC_MAD_FAILED:
3857 default:
3858 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3859 rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3860 rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
3861 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3862 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3863 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3864 else
3865 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3866
3867 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3868 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3869 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3870 ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
3871 break;
3872 };
3873
3874 kref_put(&tgt->kref, ibmvfc_release_tgt);
3875 ibmvfc_free_event(evt);
3876 wake_up(&vhost->work_wait_q);
3877 }
3878
3879 /**
3880 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3881 * @tgt: ibmvfc target struct
3882 *
3883 **/
3884 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3885 {
3886 struct ibmvfc_query_tgt *query_tgt;
3887 struct ibmvfc_host *vhost = tgt->vhost;
3888 struct ibmvfc_event *evt;
3889
3890 if (vhost->discovery_threads >= disc_threads)
3891 return;
3892
3893 kref_get(&tgt->kref);
3894 evt = ibmvfc_get_event(vhost);
3895 vhost->discovery_threads++;
3896 evt->tgt = tgt;
3897 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3898 query_tgt = &evt->iu.query_tgt;
3899 memset(query_tgt, 0, sizeof(*query_tgt));
3900 query_tgt->common.version = 1;
3901 query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
3902 query_tgt->common.length = sizeof(*query_tgt);
3903 query_tgt->wwpn = tgt->ids.port_name;
3904
3905 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3906 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3907 vhost->discovery_threads--;
3908 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3909 kref_put(&tgt->kref, ibmvfc_release_tgt);
3910 } else
3911 tgt_dbg(tgt, "Sent Query Target\n");
3912 }
3913
3914 /**
3915 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3916 * @vhost: ibmvfc host struct
3917 * @scsi_id: SCSI ID to allocate target for
3918 *
3919 * Returns:
3920 * 0 on success / other on failure
3921 **/
3922 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3923 {
3924 struct ibmvfc_target *tgt;
3925 unsigned long flags;
3926
3927 spin_lock_irqsave(vhost->host->host_lock, flags);
3928 list_for_each_entry(tgt, &vhost->targets, queue) {
3929 if (tgt->scsi_id == scsi_id) {
3930 if (tgt->need_login)
3931 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3932 goto unlock_out;
3933 }
3934 }
3935 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3936
3937 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3938 if (!tgt) {
3939 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3940 scsi_id);
3941 return -ENOMEM;
3942 }
3943
3944 memset(tgt, 0, sizeof(*tgt));
3945 tgt->scsi_id = scsi_id;
3946 tgt->new_scsi_id = scsi_id;
3947 tgt->vhost = vhost;
3948 tgt->need_login = 1;
3949 tgt->cancel_key = vhost->task_set++;
3950 init_timer(&tgt->timer);
3951 kref_init(&tgt->kref);
3952 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3953 spin_lock_irqsave(vhost->host->host_lock, flags);
3954 list_add_tail(&tgt->queue, &vhost->targets);
3955
3956 unlock_out:
3957 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3958 return 0;
3959 }
3960
3961 /**
3962 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3963 * @vhost: ibmvfc host struct
3964 *
3965 * Returns:
3966 * 0 on success / other on failure
3967 **/
3968 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3969 {
3970 int i, rc;
3971
3972 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3973 rc = ibmvfc_alloc_target(vhost,
3974 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3975
3976 return rc;
3977 }
3978
3979 /**
3980 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3981 * @evt: ibmvfc event struct
3982 *
3983 **/
3984 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3985 {
3986 struct ibmvfc_host *vhost = evt->vhost;
3987 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3988 u32 mad_status = rsp->common.status;
3989 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3990
3991 switch (mad_status) {
3992 case IBMVFC_MAD_SUCCESS:
3993 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3994 vhost->num_targets = rsp->num_written;
3995 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3996 break;
3997 case IBMVFC_MAD_FAILED:
3998 level += ibmvfc_retry_host_init(vhost);
3999 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4000 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
4001 break;
4002 case IBMVFC_MAD_DRIVER_FAILED:
4003 break;
4004 default:
4005 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4006 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4007 break;
4008 }
4009
4010 ibmvfc_free_event(evt);
4011 wake_up(&vhost->work_wait_q);
4012 }
4013
4014 /**
4015 * ibmvfc_discover_targets - Send Discover Targets MAD
4016 * @vhost: ibmvfc host struct
4017 *
4018 **/
4019 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4020 {
4021 struct ibmvfc_discover_targets *mad;
4022 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4023
4024 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
4025 mad = &evt->iu.discover_targets;
4026 memset(mad, 0, sizeof(*mad));
4027 mad->common.version = 1;
4028 mad->common.opcode = IBMVFC_DISC_TARGETS;
4029 mad->common.length = sizeof(*mad);
4030 mad->bufflen = vhost->disc_buf_sz;
4031 mad->buffer.va = vhost->disc_buf_dma;
4032 mad->buffer.len = vhost->disc_buf_sz;
4033 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4034
4035 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4036 ibmvfc_dbg(vhost, "Sent discover targets\n");
4037 else
4038 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4039 }
4040
4041 /**
4042 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4043 * @evt: ibmvfc event struct
4044 *
4045 **/
4046 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4047 {
4048 struct ibmvfc_host *vhost = evt->vhost;
4049 u32 mad_status = evt->xfer_iu->npiv_login.common.status;
4050 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4051 unsigned int npiv_max_sectors;
4052 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4053
4054 switch (mad_status) {
4055 case IBMVFC_MAD_SUCCESS:
4056 ibmvfc_free_event(evt);
4057 break;
4058 case IBMVFC_MAD_FAILED:
4059 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
4060 level += ibmvfc_retry_host_init(vhost);
4061 else
4062 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4063 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4064 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
4065 ibmvfc_free_event(evt);
4066 return;
4067 case IBMVFC_MAD_CRQ_ERROR:
4068 ibmvfc_retry_host_init(vhost);
4069 case IBMVFC_MAD_DRIVER_FAILED:
4070 ibmvfc_free_event(evt);
4071 return;
4072 default:
4073 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4074 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4075 ibmvfc_free_event(evt);
4076 return;
4077 }
4078
4079 vhost->client_migrated = 0;
4080
4081 if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
4082 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4083 rsp->flags);
4084 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4085 wake_up(&vhost->work_wait_q);
4086 return;
4087 }
4088
4089 if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
4090 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4091 rsp->max_cmds);
4092 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4093 wake_up(&vhost->work_wait_q);
4094 return;
4095 }
4096
4097 vhost->logged_in = 1;
4098 npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
4099 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4100 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4101 rsp->drc_name, npiv_max_sectors);
4102
4103 fc_host_fabric_name(vhost->host) = rsp->node_name;
4104 fc_host_node_name(vhost->host) = rsp->node_name;
4105 fc_host_port_name(vhost->host) = rsp->port_name;
4106 fc_host_port_id(vhost->host) = rsp->scsi_id;
4107 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4108 fc_host_supported_classes(vhost->host) = 0;
4109 if (rsp->service_parms.class1_parms[0] & 0x80000000)
4110 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4111 if (rsp->service_parms.class2_parms[0] & 0x80000000)
4112 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4113 if (rsp->service_parms.class3_parms[0] & 0x80000000)
4114 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4115 fc_host_maxframe_size(vhost->host) =
4116 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
4117
4118 vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
4119 vhost->host->max_sectors = npiv_max_sectors;
4120 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4121 wake_up(&vhost->work_wait_q);
4122 }
4123
4124 /**
4125 * ibmvfc_npiv_login - Sends NPIV login
4126 * @vhost: ibmvfc host struct
4127 *
4128 **/
4129 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4130 {
4131 struct ibmvfc_npiv_login_mad *mad;
4132 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4133
4134 ibmvfc_gather_partition_info(vhost);
4135 ibmvfc_set_login_info(vhost);
4136 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4137
4138 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4139 mad = &evt->iu.npiv_login;
4140 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4141 mad->common.version = 1;
4142 mad->common.opcode = IBMVFC_NPIV_LOGIN;
4143 mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
4144 mad->buffer.va = vhost->login_buf_dma;
4145 mad->buffer.len = sizeof(*vhost->login_buf);
4146
4147 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4148
4149 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4150 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4151 else
4152 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4153 };
4154
4155 /**
4156 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4157 * @vhost: ibmvfc host struct
4158 *
4159 **/
4160 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4161 {
4162 struct ibmvfc_host *vhost = evt->vhost;
4163 u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
4164
4165 ibmvfc_free_event(evt);
4166
4167 switch (mad_status) {
4168 case IBMVFC_MAD_SUCCESS:
4169 if (list_empty(&vhost->sent) &&
4170 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4171 ibmvfc_init_host(vhost);
4172 return;
4173 }
4174 break;
4175 case IBMVFC_MAD_FAILED:
4176 case IBMVFC_MAD_NOT_SUPPORTED:
4177 case IBMVFC_MAD_CRQ_ERROR:
4178 case IBMVFC_MAD_DRIVER_FAILED:
4179 default:
4180 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4181 break;
4182 }
4183
4184 ibmvfc_hard_reset_host(vhost);
4185 }
4186
4187 /**
4188 * ibmvfc_npiv_logout - Issue an NPIV Logout
4189 * @vhost: ibmvfc host struct
4190 *
4191 **/
4192 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4193 {
4194 struct ibmvfc_npiv_logout_mad *mad;
4195 struct ibmvfc_event *evt;
4196
4197 evt = ibmvfc_get_event(vhost);
4198 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4199
4200 mad = &evt->iu.npiv_logout;
4201 memset(mad, 0, sizeof(*mad));
4202 mad->common.version = 1;
4203 mad->common.opcode = IBMVFC_NPIV_LOGOUT;
4204 mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
4205
4206 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4207
4208 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4209 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4210 else
4211 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4212 }
4213
4214 /**
4215 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4216 * @vhost: ibmvfc host struct
4217 *
4218 * Returns:
4219 * 1 if work to do / 0 if not
4220 **/
4221 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4222 {
4223 struct ibmvfc_target *tgt;
4224
4225 list_for_each_entry(tgt, &vhost->targets, queue) {
4226 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4227 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4228 return 1;
4229 }
4230
4231 return 0;
4232 }
4233
4234 /**
4235 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4236 * @vhost: ibmvfc host struct
4237 *
4238 * Returns:
4239 * 1 if work to do / 0 if not
4240 **/
4241 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4242 {
4243 struct ibmvfc_target *tgt;
4244
4245 if (kthread_should_stop())
4246 return 1;
4247 switch (vhost->action) {
4248 case IBMVFC_HOST_ACTION_NONE:
4249 case IBMVFC_HOST_ACTION_INIT_WAIT:
4250 case IBMVFC_HOST_ACTION_LOGO_WAIT:
4251 return 0;
4252 case IBMVFC_HOST_ACTION_TGT_INIT:
4253 case IBMVFC_HOST_ACTION_QUERY_TGTS:
4254 if (vhost->discovery_threads == disc_threads)
4255 return 0;
4256 list_for_each_entry(tgt, &vhost->targets, queue)
4257 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4258 return 1;
4259 list_for_each_entry(tgt, &vhost->targets, queue)
4260 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4261 return 0;
4262 return 1;
4263 case IBMVFC_HOST_ACTION_LOGO:
4264 case IBMVFC_HOST_ACTION_INIT:
4265 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4266 case IBMVFC_HOST_ACTION_TGT_DEL:
4267 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4268 case IBMVFC_HOST_ACTION_QUERY:
4269 case IBMVFC_HOST_ACTION_RESET:
4270 case IBMVFC_HOST_ACTION_REENABLE:
4271 default:
4272 break;
4273 };
4274
4275 return 1;
4276 }
4277
4278 /**
4279 * ibmvfc_work_to_do - Is there task level work to do?
4280 * @vhost: ibmvfc host struct
4281 *
4282 * Returns:
4283 * 1 if work to do / 0 if not
4284 **/
4285 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4286 {
4287 unsigned long flags;
4288 int rc;
4289
4290 spin_lock_irqsave(vhost->host->host_lock, flags);
4291 rc = __ibmvfc_work_to_do(vhost);
4292 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4293 return rc;
4294 }
4295
4296 /**
4297 * ibmvfc_log_ae - Log async events if necessary
4298 * @vhost: ibmvfc host struct
4299 * @events: events to log
4300 *
4301 **/
4302 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4303 {
4304 if (events & IBMVFC_AE_RSCN)
4305 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4306 if ((events & IBMVFC_AE_LINKDOWN) &&
4307 vhost->state >= IBMVFC_HALTED)
4308 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4309 if ((events & IBMVFC_AE_LINKUP) &&
4310 vhost->state == IBMVFC_INITIALIZING)
4311 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4312 }
4313
4314 /**
4315 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4316 * @tgt: ibmvfc target struct
4317 *
4318 **/
4319 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4320 {
4321 struct ibmvfc_host *vhost = tgt->vhost;
4322 struct fc_rport *rport;
4323 unsigned long flags;
4324
4325 tgt_dbg(tgt, "Adding rport\n");
4326 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4327 spin_lock_irqsave(vhost->host->host_lock, flags);
4328
4329 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4330 tgt_dbg(tgt, "Deleting rport\n");
4331 list_del(&tgt->queue);
4332 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4333 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4334 fc_remote_port_delete(rport);
4335 del_timer_sync(&tgt->timer);
4336 kref_put(&tgt->kref, ibmvfc_release_tgt);
4337 return;
4338 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4339 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4340 return;
4341 }
4342
4343 if (rport) {
4344 tgt_dbg(tgt, "rport add succeeded\n");
4345 tgt->rport = rport;
4346 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
4347 rport->supported_classes = 0;
4348 tgt->target_id = rport->scsi_target_id;
4349 if (tgt->service_parms.class1_parms[0] & 0x80000000)
4350 rport->supported_classes |= FC_COS_CLASS1;
4351 if (tgt->service_parms.class2_parms[0] & 0x80000000)
4352 rport->supported_classes |= FC_COS_CLASS2;
4353 if (tgt->service_parms.class3_parms[0] & 0x80000000)
4354 rport->supported_classes |= FC_COS_CLASS3;
4355 if (rport->rqst_q)
4356 blk_queue_max_segments(rport->rqst_q, 1);
4357 } else
4358 tgt_dbg(tgt, "rport add failed\n");
4359 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4360 }
4361
4362 /**
4363 * ibmvfc_do_work - Do task level work
4364 * @vhost: ibmvfc host struct
4365 *
4366 **/
4367 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4368 {
4369 struct ibmvfc_target *tgt;
4370 unsigned long flags;
4371 struct fc_rport *rport;
4372 int rc;
4373
4374 ibmvfc_log_ae(vhost, vhost->events_to_log);
4375 spin_lock_irqsave(vhost->host->host_lock, flags);
4376 vhost->events_to_log = 0;
4377 switch (vhost->action) {
4378 case IBMVFC_HOST_ACTION_NONE:
4379 case IBMVFC_HOST_ACTION_LOGO_WAIT:
4380 case IBMVFC_HOST_ACTION_INIT_WAIT:
4381 break;
4382 case IBMVFC_HOST_ACTION_RESET:
4383 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4384 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4385 rc = ibmvfc_reset_crq(vhost);
4386 spin_lock_irqsave(vhost->host->host_lock, flags);
4387 if (rc == H_CLOSED)
4388 vio_enable_interrupts(to_vio_dev(vhost->dev));
4389 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4390 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4391 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4392 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4393 }
4394 break;
4395 case IBMVFC_HOST_ACTION_REENABLE:
4396 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4397 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4398 rc = ibmvfc_reenable_crq_queue(vhost);
4399 spin_lock_irqsave(vhost->host->host_lock, flags);
4400 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4401 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4402 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4403 }
4404 break;
4405 case IBMVFC_HOST_ACTION_LOGO:
4406 vhost->job_step(vhost);
4407 break;
4408 case IBMVFC_HOST_ACTION_INIT:
4409 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4410 if (vhost->delay_init) {
4411 vhost->delay_init = 0;
4412 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4413 ssleep(15);
4414 return;
4415 } else
4416 vhost->job_step(vhost);
4417 break;
4418 case IBMVFC_HOST_ACTION_QUERY:
4419 list_for_each_entry(tgt, &vhost->targets, queue)
4420 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4421 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4422 break;
4423 case IBMVFC_HOST_ACTION_QUERY_TGTS:
4424 list_for_each_entry(tgt, &vhost->targets, queue) {
4425 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4426 tgt->job_step(tgt);
4427 break;
4428 }
4429 }
4430
4431 if (!ibmvfc_dev_init_to_do(vhost))
4432 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4433 break;
4434 case IBMVFC_HOST_ACTION_TGT_DEL:
4435 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4436 list_for_each_entry(tgt, &vhost->targets, queue) {
4437 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4438 tgt_dbg(tgt, "Deleting rport\n");
4439 rport = tgt->rport;
4440 tgt->rport = NULL;
4441 list_del(&tgt->queue);
4442 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4443 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4444 if (rport)
4445 fc_remote_port_delete(rport);
4446 del_timer_sync(&tgt->timer);
4447 kref_put(&tgt->kref, ibmvfc_release_tgt);
4448 return;
4449 }
4450 }
4451
4452 if (vhost->state == IBMVFC_INITIALIZING) {
4453 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4454 if (vhost->reinit) {
4455 vhost->reinit = 0;
4456 scsi_block_requests(vhost->host);
4457 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4458 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4459 } else {
4460 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4461 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4462 wake_up(&vhost->init_wait_q);
4463 schedule_work(&vhost->rport_add_work_q);
4464 vhost->init_retries = 0;
4465 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4466 scsi_unblock_requests(vhost->host);
4467 }
4468
4469 return;
4470 } else {
4471 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4472 vhost->job_step = ibmvfc_discover_targets;
4473 }
4474 } else {
4475 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4476 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4477 scsi_unblock_requests(vhost->host);
4478 wake_up(&vhost->init_wait_q);
4479 return;
4480 }
4481 break;
4482 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4483 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4484 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4485 ibmvfc_alloc_targets(vhost);
4486 spin_lock_irqsave(vhost->host->host_lock, flags);
4487 break;
4488 case IBMVFC_HOST_ACTION_TGT_INIT:
4489 list_for_each_entry(tgt, &vhost->targets, queue) {
4490 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4491 tgt->job_step(tgt);
4492 break;
4493 }
4494 }
4495
4496 if (!ibmvfc_dev_init_to_do(vhost))
4497 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4498 break;
4499 default:
4500 break;
4501 };
4502
4503 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4504 }
4505
4506 /**
4507 * ibmvfc_work - Do task level work
4508 * @data: ibmvfc host struct
4509 *
4510 * Returns:
4511 * zero
4512 **/
4513 static int ibmvfc_work(void *data)
4514 {
4515 struct ibmvfc_host *vhost = data;
4516 int rc;
4517
4518 set_user_nice(current, -20);
4519
4520 while (1) {
4521 rc = wait_event_interruptible(vhost->work_wait_q,
4522 ibmvfc_work_to_do(vhost));
4523
4524 BUG_ON(rc);
4525
4526 if (kthread_should_stop())
4527 break;
4528
4529 ibmvfc_do_work(vhost);
4530 }
4531
4532 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4533 return 0;
4534 }
4535
4536 /**
4537 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4538 * @vhost: ibmvfc host struct
4539 *
4540 * Allocates a page for messages, maps it for dma, and registers
4541 * the crq with the hypervisor.
4542 *
4543 * Return value:
4544 * zero on success / other on failure
4545 **/
4546 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4547 {
4548 int rc, retrc = -ENOMEM;
4549 struct device *dev = vhost->dev;
4550 struct vio_dev *vdev = to_vio_dev(dev);
4551 struct ibmvfc_crq_queue *crq = &vhost->crq;
4552
4553 ENTER;
4554 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4555
4556 if (!crq->msgs)
4557 return -ENOMEM;
4558
4559 crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4560 crq->msg_token = dma_map_single(dev, crq->msgs,
4561 PAGE_SIZE, DMA_BIDIRECTIONAL);
4562
4563 if (dma_mapping_error(dev, crq->msg_token))
4564 goto map_failed;
4565
4566 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4567 crq->msg_token, PAGE_SIZE);
4568
4569 if (rc == H_RESOURCE)
4570 /* maybe kexecing and resource is busy. try a reset */
4571 retrc = rc = ibmvfc_reset_crq(vhost);
4572
4573 if (rc == H_CLOSED)
4574 dev_warn(dev, "Partner adapter not ready\n");
4575 else if (rc) {
4576 dev_warn(dev, "Error %d opening adapter\n", rc);
4577 goto reg_crq_failed;
4578 }
4579
4580 retrc = 0;
4581
4582 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4583
4584 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4585 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4586 goto req_irq_failed;
4587 }
4588
4589 if ((rc = vio_enable_interrupts(vdev))) {
4590 dev_err(dev, "Error %d enabling interrupts\n", rc);
4591 goto req_irq_failed;
4592 }
4593
4594 crq->cur = 0;
4595 LEAVE;
4596 return retrc;
4597
4598 req_irq_failed:
4599 tasklet_kill(&vhost->tasklet);
4600 do {
4601 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4602 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4603 reg_crq_failed:
4604 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4605 map_failed:
4606 free_page((unsigned long)crq->msgs);
4607 return retrc;
4608 }
4609
4610 /**
4611 * ibmvfc_free_mem - Free memory for vhost
4612 * @vhost: ibmvfc host struct
4613 *
4614 * Return value:
4615 * none
4616 **/
4617 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4618 {
4619 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4620
4621 ENTER;
4622 mempool_destroy(vhost->tgt_pool);
4623 kfree(vhost->trace);
4624 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4625 vhost->disc_buf_dma);
4626 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4627 vhost->login_buf, vhost->login_buf_dma);
4628 dma_pool_destroy(vhost->sg_pool);
4629 dma_unmap_single(vhost->dev, async_q->msg_token,
4630 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4631 free_page((unsigned long)async_q->msgs);
4632 LEAVE;
4633 }
4634
4635 /**
4636 * ibmvfc_alloc_mem - Allocate memory for vhost
4637 * @vhost: ibmvfc host struct
4638 *
4639 * Return value:
4640 * 0 on success / non-zero on failure
4641 **/
4642 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4643 {
4644 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4645 struct device *dev = vhost->dev;
4646
4647 ENTER;
4648 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4649 if (!async_q->msgs) {
4650 dev_err(dev, "Couldn't allocate async queue.\n");
4651 goto nomem;
4652 }
4653
4654 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4655 async_q->msg_token = dma_map_single(dev, async_q->msgs,
4656 async_q->size * sizeof(*async_q->msgs),
4657 DMA_BIDIRECTIONAL);
4658
4659 if (dma_mapping_error(dev, async_q->msg_token)) {
4660 dev_err(dev, "Failed to map async queue\n");
4661 goto free_async_crq;
4662 }
4663
4664 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4665 SG_ALL * sizeof(struct srp_direct_buf),
4666 sizeof(struct srp_direct_buf), 0);
4667
4668 if (!vhost->sg_pool) {
4669 dev_err(dev, "Failed to allocate sg pool\n");
4670 goto unmap_async_crq;
4671 }
4672
4673 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4674 &vhost->login_buf_dma, GFP_KERNEL);
4675
4676 if (!vhost->login_buf) {
4677 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4678 goto free_sg_pool;
4679 }
4680
4681 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4682 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4683 &vhost->disc_buf_dma, GFP_KERNEL);
4684
4685 if (!vhost->disc_buf) {
4686 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4687 goto free_login_buffer;
4688 }
4689
4690 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4691 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4692
4693 if (!vhost->trace)
4694 goto free_disc_buffer;
4695
4696 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4697 sizeof(struct ibmvfc_target));
4698
4699 if (!vhost->tgt_pool) {
4700 dev_err(dev, "Couldn't allocate target memory pool\n");
4701 goto free_trace;
4702 }
4703
4704 LEAVE;
4705 return 0;
4706
4707 free_trace:
4708 kfree(vhost->trace);
4709 free_disc_buffer:
4710 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4711 vhost->disc_buf_dma);
4712 free_login_buffer:
4713 dma_free_coherent(dev, sizeof(*vhost->login_buf),
4714 vhost->login_buf, vhost->login_buf_dma);
4715 free_sg_pool:
4716 dma_pool_destroy(vhost->sg_pool);
4717 unmap_async_crq:
4718 dma_unmap_single(dev, async_q->msg_token,
4719 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4720 free_async_crq:
4721 free_page((unsigned long)async_q->msgs);
4722 nomem:
4723 LEAVE;
4724 return -ENOMEM;
4725 }
4726
4727 /**
4728 * ibmvfc_rport_add_thread - Worker thread for rport adds
4729 * @work: work struct
4730 *
4731 **/
4732 static void ibmvfc_rport_add_thread(struct work_struct *work)
4733 {
4734 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4735 rport_add_work_q);
4736 struct ibmvfc_target *tgt;
4737 struct fc_rport *rport;
4738 unsigned long flags;
4739 int did_work;
4740
4741 ENTER;
4742 spin_lock_irqsave(vhost->host->host_lock, flags);
4743 do {
4744 did_work = 0;
4745 if (vhost->state != IBMVFC_ACTIVE)
4746 break;
4747
4748 list_for_each_entry(tgt, &vhost->targets, queue) {
4749 if (tgt->add_rport) {
4750 did_work = 1;
4751 tgt->add_rport = 0;
4752 kref_get(&tgt->kref);
4753 rport = tgt->rport;
4754 if (!rport) {
4755 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4756 ibmvfc_tgt_add_rport(tgt);
4757 } else if (get_device(&rport->dev)) {
4758 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4759 tgt_dbg(tgt, "Setting rport roles\n");
4760 fc_remote_port_rolechg(rport, tgt->ids.roles);
4761 put_device(&rport->dev);
4762 }
4763
4764 kref_put(&tgt->kref, ibmvfc_release_tgt);
4765 spin_lock_irqsave(vhost->host->host_lock, flags);
4766 break;
4767 }
4768 }
4769 } while(did_work);
4770
4771 if (vhost->state == IBMVFC_ACTIVE)
4772 vhost->scan_complete = 1;
4773 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4774 LEAVE;
4775 }
4776
4777 /**
4778 * ibmvfc_probe - Adapter hot plug add entry point
4779 * @vdev: vio device struct
4780 * @id: vio device id struct
4781 *
4782 * Return value:
4783 * 0 on success / non-zero on failure
4784 **/
4785 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4786 {
4787 struct ibmvfc_host *vhost;
4788 struct Scsi_Host *shost;
4789 struct device *dev = &vdev->dev;
4790 int rc = -ENOMEM;
4791
4792 ENTER;
4793 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4794 if (!shost) {
4795 dev_err(dev, "Couldn't allocate host data\n");
4796 goto out;
4797 }
4798
4799 shost->transportt = ibmvfc_transport_template;
4800 shost->can_queue = max_requests;
4801 shost->max_lun = max_lun;
4802 shost->max_id = max_targets;
4803 shost->max_sectors = IBMVFC_MAX_SECTORS;
4804 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4805 shost->unique_id = shost->host_no;
4806
4807 vhost = shost_priv(shost);
4808 INIT_LIST_HEAD(&vhost->sent);
4809 INIT_LIST_HEAD(&vhost->free);
4810 INIT_LIST_HEAD(&vhost->targets);
4811 sprintf(vhost->name, IBMVFC_NAME);
4812 vhost->host = shost;
4813 vhost->dev = dev;
4814 vhost->partition_number = -1;
4815 vhost->log_level = log_level;
4816 vhost->task_set = 1;
4817 strcpy(vhost->partition_name, "UNKNOWN");
4818 init_waitqueue_head(&vhost->work_wait_q);
4819 init_waitqueue_head(&vhost->init_wait_q);
4820 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4821 mutex_init(&vhost->passthru_mutex);
4822
4823 if ((rc = ibmvfc_alloc_mem(vhost)))
4824 goto free_scsi_host;
4825
4826 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4827 shost->host_no);
4828
4829 if (IS_ERR(vhost->work_thread)) {
4830 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4831 PTR_ERR(vhost->work_thread));
4832 goto free_host_mem;
4833 }
4834
4835 if ((rc = ibmvfc_init_crq(vhost))) {
4836 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4837 goto kill_kthread;
4838 }
4839
4840 if ((rc = ibmvfc_init_event_pool(vhost))) {
4841 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4842 goto release_crq;
4843 }
4844
4845 if ((rc = scsi_add_host(shost, dev)))
4846 goto release_event_pool;
4847
4848 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4849
4850 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4851 &ibmvfc_trace_attr))) {
4852 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4853 goto remove_shost;
4854 }
4855
4856 if (shost_to_fc_host(shost)->rqst_q)
4857 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4858 dev_set_drvdata(dev, vhost);
4859 spin_lock(&ibmvfc_driver_lock);
4860 list_add_tail(&vhost->queue, &ibmvfc_head);
4861 spin_unlock(&ibmvfc_driver_lock);
4862
4863 ibmvfc_send_crq_init(vhost);
4864 scsi_scan_host(shost);
4865 return 0;
4866
4867 remove_shost:
4868 scsi_remove_host(shost);
4869 release_event_pool:
4870 ibmvfc_free_event_pool(vhost);
4871 release_crq:
4872 ibmvfc_release_crq_queue(vhost);
4873 kill_kthread:
4874 kthread_stop(vhost->work_thread);
4875 free_host_mem:
4876 ibmvfc_free_mem(vhost);
4877 free_scsi_host:
4878 scsi_host_put(shost);
4879 out:
4880 LEAVE;
4881 return rc;
4882 }
4883
4884 /**
4885 * ibmvfc_remove - Adapter hot plug remove entry point
4886 * @vdev: vio device struct
4887 *
4888 * Return value:
4889 * 0
4890 **/
4891 static int ibmvfc_remove(struct vio_dev *vdev)
4892 {
4893 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4894 unsigned long flags;
4895
4896 ENTER;
4897 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4898
4899 spin_lock_irqsave(vhost->host->host_lock, flags);
4900 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4901 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4902
4903 ibmvfc_wait_while_resetting(vhost);
4904 ibmvfc_release_crq_queue(vhost);
4905 kthread_stop(vhost->work_thread);
4906 fc_remove_host(vhost->host);
4907 scsi_remove_host(vhost->host);
4908
4909 spin_lock_irqsave(vhost->host->host_lock, flags);
4910 ibmvfc_purge_requests(vhost, DID_ERROR);
4911 ibmvfc_free_event_pool(vhost);
4912 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4913
4914 ibmvfc_free_mem(vhost);
4915 spin_lock(&ibmvfc_driver_lock);
4916 list_del(&vhost->queue);
4917 spin_unlock(&ibmvfc_driver_lock);
4918 scsi_host_put(vhost->host);
4919 LEAVE;
4920 return 0;
4921 }
4922
4923 /**
4924 * ibmvfc_resume - Resume from suspend
4925 * @dev: device struct
4926 *
4927 * We may have lost an interrupt across suspend/resume, so kick the
4928 * interrupt handler
4929 *
4930 */
4931 static int ibmvfc_resume(struct device *dev)
4932 {
4933 unsigned long flags;
4934 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4935 struct vio_dev *vdev = to_vio_dev(dev);
4936
4937 spin_lock_irqsave(vhost->host->host_lock, flags);
4938 vio_disable_interrupts(vdev);
4939 tasklet_schedule(&vhost->tasklet);
4940 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4941 return 0;
4942 }
4943
4944 /**
4945 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4946 * @vdev: vio device struct
4947 *
4948 * Return value:
4949 * Number of bytes the driver will need to DMA map at the same time in
4950 * order to perform well.
4951 */
4952 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4953 {
4954 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4955 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4956 }
4957
4958 static struct vio_device_id ibmvfc_device_table[] = {
4959 {"fcp", "IBM,vfc-client"},
4960 { "", "" }
4961 };
4962 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4963
4964 static struct dev_pm_ops ibmvfc_pm_ops = {
4965 .resume = ibmvfc_resume
4966 };
4967
4968 static struct vio_driver ibmvfc_driver = {
4969 .id_table = ibmvfc_device_table,
4970 .probe = ibmvfc_probe,
4971 .remove = ibmvfc_remove,
4972 .get_desired_dma = ibmvfc_get_desired_dma,
4973 .name = IBMVFC_NAME,
4974 .pm = &ibmvfc_pm_ops,
4975 };
4976
4977 static struct fc_function_template ibmvfc_transport_functions = {
4978 .show_host_fabric_name = 1,
4979 .show_host_node_name = 1,
4980 .show_host_port_name = 1,
4981 .show_host_supported_classes = 1,
4982 .show_host_port_type = 1,
4983 .show_host_port_id = 1,
4984 .show_host_maxframe_size = 1,
4985
4986 .get_host_port_state = ibmvfc_get_host_port_state,
4987 .show_host_port_state = 1,
4988
4989 .get_host_speed = ibmvfc_get_host_speed,
4990 .show_host_speed = 1,
4991
4992 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4993 .terminate_rport_io = ibmvfc_terminate_rport_io,
4994
4995 .show_rport_maxframe_size = 1,
4996 .show_rport_supported_classes = 1,
4997
4998 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4999 .show_rport_dev_loss_tmo = 1,
5000
5001 .get_starget_node_name = ibmvfc_get_starget_node_name,
5002 .show_starget_node_name = 1,
5003
5004 .get_starget_port_name = ibmvfc_get_starget_port_name,
5005 .show_starget_port_name = 1,
5006
5007 .get_starget_port_id = ibmvfc_get_starget_port_id,
5008 .show_starget_port_id = 1,
5009
5010 .bsg_request = ibmvfc_bsg_request,
5011 .bsg_timeout = ibmvfc_bsg_timeout,
5012 };
5013
5014 /**
5015 * ibmvfc_module_init - Initialize the ibmvfc module
5016 *
5017 * Return value:
5018 * 0 on success / other on failure
5019 **/
5020 static int __init ibmvfc_module_init(void)
5021 {
5022 int rc;
5023
5024 if (!firmware_has_feature(FW_FEATURE_VIO))
5025 return -ENODEV;
5026
5027 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
5028 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
5029
5030 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
5031 if (!ibmvfc_transport_template)
5032 return -ENOMEM;
5033
5034 rc = vio_register_driver(&ibmvfc_driver);
5035 if (rc)
5036 fc_release_transport(ibmvfc_transport_template);
5037 return rc;
5038 }
5039
5040 /**
5041 * ibmvfc_module_exit - Teardown the ibmvfc module
5042 *
5043 * Return value:
5044 * nothing
5045 **/
5046 static void __exit ibmvfc_module_exit(void)
5047 {
5048 vio_unregister_driver(&ibmvfc_driver);
5049 fc_release_transport(ibmvfc_transport_template);
5050 }
5051
5052 module_init(ibmvfc_module_init);
5053 module_exit(ibmvfc_module_exit);
Linux with added FPC-III support