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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / scsi / ibmvscsi / ibmvfc.c
blob9f75a6d519a21bc032610cdd5a5a23e4c048af18
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 dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
54 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
55 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
56 static LIST_HEAD(ibmvfc_head);
57 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
58 static struct scsi_transport_template *ibmvfc_transport_template;
59
60 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
61 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
62 MODULE_LICENSE("GPL");
63 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
64
65 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
66 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
67 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
68 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
69 MODULE_PARM_DESC(default_timeout,
70 "Default timeout in seconds for initialization and EH commands. "
71 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
72 module_param_named(max_requests, max_requests, uint, S_IRUGO);
73 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
74 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
75 module_param_named(max_lun, max_lun, uint, S_IRUGO);
76 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
77 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
78 module_param_named(max_targets, max_targets, uint, S_IRUGO);
79 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
80 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
81 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
82 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
83 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
84 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
85 MODULE_PARM_DESC(debug, "Enable driver debug information. "
86 "[Default=" __stringify(IBMVFC_DEBUG) "]");
87 module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
88 MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
89 "transport should insulate the loss of a remote port. Once this "
90 "value is exceeded, the scsi target is removed. "
91 "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
92 module_param_named(log_level, log_level, uint, 0);
93 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
94 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
95
96 static const struct {
97 u16 status;
98 u16 error;
99 u8 result;
100 u8 retry;
101 int log;
102 char *name;
103 } cmd_status [] = {
104 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
105 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
106 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
107 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
108 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
109 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
110 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
111 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
112 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
113 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
114 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
115 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
116 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
117 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
118
119 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
120 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
121 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
122 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
123 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
124 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
125 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
126 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
127 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
128 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
129
130 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
131 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
132 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
133 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
134 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
135 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
136 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
137 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
138 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
139 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
140 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
141
142 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
143 };
144
145 static void ibmvfc_npiv_login(struct ibmvfc_host *);
146 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
147 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
148 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
149 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
150
151 static const char *unknown_error = "unknown error";
152
153 #ifdef CONFIG_SCSI_IBMVFC_TRACE
154 /**
155 * ibmvfc_trc_start - Log a start trace entry
156 * @evt: ibmvfc event struct
157 *
158 **/
159 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
160 {
161 struct ibmvfc_host *vhost = evt->vhost;
162 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
163 struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
164 struct ibmvfc_trace_entry *entry;
165
166 entry = &vhost->trace[vhost->trace_index++];
167 entry->evt = evt;
168 entry->time = jiffies;
169 entry->fmt = evt->crq.format;
170 entry->type = IBMVFC_TRC_START;
171
172 switch (entry->fmt) {
173 case IBMVFC_CMD_FORMAT:
174 entry->op_code = vfc_cmd->iu.cdb[0];
175 entry->scsi_id = vfc_cmd->tgt_scsi_id;
176 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
177 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
178 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
179 break;
180 case IBMVFC_MAD_FORMAT:
181 entry->op_code = mad->opcode;
182 break;
183 default:
184 break;
185 };
186 }
187
188 /**
189 * ibmvfc_trc_end - Log an end trace entry
190 * @evt: ibmvfc event struct
191 *
192 **/
193 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
194 {
195 struct ibmvfc_host *vhost = evt->vhost;
196 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
197 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
198 struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
199
200 entry->evt = evt;
201 entry->time = jiffies;
202 entry->fmt = evt->crq.format;
203 entry->type = IBMVFC_TRC_END;
204
205 switch (entry->fmt) {
206 case IBMVFC_CMD_FORMAT:
207 entry->op_code = vfc_cmd->iu.cdb[0];
208 entry->scsi_id = vfc_cmd->tgt_scsi_id;
209 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
210 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
211 entry->u.end.status = vfc_cmd->status;
212 entry->u.end.error = vfc_cmd->error;
213 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
214 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
215 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
216 break;
217 case IBMVFC_MAD_FORMAT:
218 entry->op_code = mad->opcode;
219 entry->u.end.status = mad->status;
220 break;
221 default:
222 break;
223
224 };
225 }
226
227 #else
228 #define ibmvfc_trc_start(evt) do { } while (0)
229 #define ibmvfc_trc_end(evt) do { } while (0)
230 #endif
231
232 /**
233 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
234 * @status: status / error class
235 * @error: error
236 *
237 * Return value:
238 * index into cmd_status / -EINVAL on failure
239 **/
240 static int ibmvfc_get_err_index(u16 status, u16 error)
241 {
242 int i;
243
244 for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
245 if ((cmd_status[i].status & status) == cmd_status[i].status &&
246 cmd_status[i].error == error)
247 return i;
248
249 return -EINVAL;
250 }
251
252 /**
253 * ibmvfc_get_cmd_error - Find the error description for the fcp response
254 * @status: status / error class
255 * @error: error
256 *
257 * Return value:
258 * error description string
259 **/
260 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
261 {
262 int rc = ibmvfc_get_err_index(status, error);
263 if (rc >= 0)
264 return cmd_status[rc].name;
265 return unknown_error;
266 }
267
268 /**
269 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
270 * @vfc_cmd: ibmvfc command struct
271 *
272 * Return value:
273 * SCSI result value to return for completed command
274 **/
275 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
276 {
277 int err;
278 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
279 int fc_rsp_len = rsp->fcp_rsp_len;
280
281 if ((rsp->flags & FCP_RSP_LEN_VALID) &&
282 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
283 rsp->data.info.rsp_code))
284 return DID_ERROR << 16;
285
286 err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
287 if (err >= 0)
288 return rsp->scsi_status | (cmd_status[err].result << 16);
289 return rsp->scsi_status | (DID_ERROR << 16);
290 }
291
292 /**
293 * ibmvfc_retry_cmd - Determine if error status is retryable
294 * @status: status / error class
295 * @error: error
296 *
297 * Return value:
298 * 1 if error should be retried / 0 if it should not
299 **/
300 static int ibmvfc_retry_cmd(u16 status, u16 error)
301 {
302 int rc = ibmvfc_get_err_index(status, error);
303
304 if (rc >= 0)
305 return cmd_status[rc].retry;
306 return 1;
307 }
308
309 static const char *unknown_fc_explain = "unknown fc explain";
310
311 static const struct {
312 u16 fc_explain;
313 char *name;
314 } ls_explain [] = {
315 { 0x00, "no additional explanation" },
316 { 0x01, "service parameter error - options" },
317 { 0x03, "service parameter error - initiator control" },
318 { 0x05, "service parameter error - recipient control" },
319 { 0x07, "service parameter error - received data field size" },
320 { 0x09, "service parameter error - concurrent seq" },
321 { 0x0B, "service parameter error - credit" },
322 { 0x0D, "invalid N_Port/F_Port_Name" },
323 { 0x0E, "invalid node/Fabric Name" },
324 { 0x0F, "invalid common service parameters" },
325 { 0x11, "invalid association header" },
326 { 0x13, "association header required" },
327 { 0x15, "invalid originator S_ID" },
328 { 0x17, "invalid OX_ID-RX-ID combination" },
329 { 0x19, "command (request) already in progress" },
330 { 0x1E, "N_Port Login requested" },
331 { 0x1F, "Invalid N_Port_ID" },
332 };
333
334 static const struct {
335 u16 fc_explain;
336 char *name;
337 } gs_explain [] = {
338 { 0x00, "no additional explanation" },
339 { 0x01, "port identifier not registered" },
340 { 0x02, "port name not registered" },
341 { 0x03, "node name not registered" },
342 { 0x04, "class of service not registered" },
343 { 0x06, "initial process associator not registered" },
344 { 0x07, "FC-4 TYPEs not registered" },
345 { 0x08, "symbolic port name not registered" },
346 { 0x09, "symbolic node name not registered" },
347 { 0x0A, "port type not registered" },
348 { 0xF0, "authorization exception" },
349 { 0xF1, "authentication exception" },
350 { 0xF2, "data base full" },
351 { 0xF3, "data base empty" },
352 { 0xF4, "processing request" },
353 { 0xF5, "unable to verify connection" },
354 { 0xF6, "devices not in a common zone" },
355 };
356
357 /**
358 * ibmvfc_get_ls_explain - Return the FC Explain description text
359 * @status: FC Explain status
360 *
361 * Returns:
362 * error string
363 **/
364 static const char *ibmvfc_get_ls_explain(u16 status)
365 {
366 int i;
367
368 for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
369 if (ls_explain[i].fc_explain == status)
370 return ls_explain[i].name;
371
372 return unknown_fc_explain;
373 }
374
375 /**
376 * ibmvfc_get_gs_explain - Return the FC Explain description text
377 * @status: FC Explain status
378 *
379 * Returns:
380 * error string
381 **/
382 static const char *ibmvfc_get_gs_explain(u16 status)
383 {
384 int i;
385
386 for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
387 if (gs_explain[i].fc_explain == status)
388 return gs_explain[i].name;
389
390 return unknown_fc_explain;
391 }
392
393 static const struct {
394 enum ibmvfc_fc_type fc_type;
395 char *name;
396 } fc_type [] = {
397 { IBMVFC_FABRIC_REJECT, "fabric reject" },
398 { IBMVFC_PORT_REJECT, "port reject" },
399 { IBMVFC_LS_REJECT, "ELS reject" },
400 { IBMVFC_FABRIC_BUSY, "fabric busy" },
401 { IBMVFC_PORT_BUSY, "port busy" },
402 { IBMVFC_BASIC_REJECT, "basic reject" },
403 };
404
405 static const char *unknown_fc_type = "unknown fc type";
406
407 /**
408 * ibmvfc_get_fc_type - Return the FC Type description text
409 * @status: FC Type error status
410 *
411 * Returns:
412 * error string
413 **/
414 static const char *ibmvfc_get_fc_type(u16 status)
415 {
416 int i;
417
418 for (i = 0; i < ARRAY_SIZE(fc_type); i++)
419 if (fc_type[i].fc_type == status)
420 return fc_type[i].name;
421
422 return unknown_fc_type;
423 }
424
425 /**
426 * ibmvfc_set_tgt_action - Set the next init action for the target
427 * @tgt: ibmvfc target struct
428 * @action: action to perform
429 *
430 **/
431 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
432 enum ibmvfc_target_action action)
433 {
434 switch (tgt->action) {
435 case IBMVFC_TGT_ACTION_DEL_RPORT:
436 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
437 tgt->action = action;
438 case IBMVFC_TGT_ACTION_DELETED_RPORT:
439 break;
440 default:
441 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
442 tgt->add_rport = 0;
443 tgt->action = action;
444 break;
445 }
446 }
447
448 /**
449 * ibmvfc_set_host_state - Set the state for the host
450 * @vhost: ibmvfc host struct
451 * @state: state to set host to
452 *
453 * Returns:
454 * 0 if state changed / non-zero if not changed
455 **/
456 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
457 enum ibmvfc_host_state state)
458 {
459 int rc = 0;
460
461 switch (vhost->state) {
462 case IBMVFC_HOST_OFFLINE:
463 rc = -EINVAL;
464 break;
465 default:
466 vhost->state = state;
467 break;
468 };
469
470 return rc;
471 }
472
473 /**
474 * ibmvfc_set_host_action - Set the next init action for the host
475 * @vhost: ibmvfc host struct
476 * @action: action to perform
477 *
478 **/
479 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
480 enum ibmvfc_host_action action)
481 {
482 switch (action) {
483 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
484 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
485 vhost->action = action;
486 break;
487 case IBMVFC_HOST_ACTION_LOGO_WAIT:
488 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
489 vhost->action = action;
490 break;
491 case IBMVFC_HOST_ACTION_INIT_WAIT:
492 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
493 vhost->action = action;
494 break;
495 case IBMVFC_HOST_ACTION_QUERY:
496 switch (vhost->action) {
497 case IBMVFC_HOST_ACTION_INIT_WAIT:
498 case IBMVFC_HOST_ACTION_NONE:
499 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
500 vhost->action = action;
501 break;
502 default:
503 break;
504 };
505 break;
506 case IBMVFC_HOST_ACTION_TGT_INIT:
507 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
508 vhost->action = action;
509 break;
510 case IBMVFC_HOST_ACTION_INIT:
511 case IBMVFC_HOST_ACTION_TGT_DEL:
512 switch (vhost->action) {
513 case IBMVFC_HOST_ACTION_RESET:
514 case IBMVFC_HOST_ACTION_REENABLE:
515 break;
516 default:
517 vhost->action = action;
518 break;
519 };
520 break;
521 case IBMVFC_HOST_ACTION_LOGO:
522 case IBMVFC_HOST_ACTION_QUERY_TGTS:
523 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
524 case IBMVFC_HOST_ACTION_NONE:
525 case IBMVFC_HOST_ACTION_RESET:
526 case IBMVFC_HOST_ACTION_REENABLE:
527 default:
528 vhost->action = action;
529 break;
530 };
531 }
532
533 /**
534 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
535 * @vhost: ibmvfc host struct
536 *
537 * Return value:
538 * nothing
539 **/
540 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
541 {
542 if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
543 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
544 scsi_block_requests(vhost->host);
545 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
546 }
547 } else
548 vhost->reinit = 1;
549
550 wake_up(&vhost->work_wait_q);
551 }
552
553 /**
554 * ibmvfc_link_down - Handle a link down event from the adapter
555 * @vhost: ibmvfc host struct
556 * @state: ibmvfc host state to enter
557 *
558 **/
559 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
560 enum ibmvfc_host_state state)
561 {
562 struct ibmvfc_target *tgt;
563
564 ENTER;
565 scsi_block_requests(vhost->host);
566 list_for_each_entry(tgt, &vhost->targets, queue)
567 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
568 ibmvfc_set_host_state(vhost, state);
569 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
570 vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
571 wake_up(&vhost->work_wait_q);
572 LEAVE;
573 }
574
575 /**
576 * ibmvfc_init_host - Start host initialization
577 * @vhost: ibmvfc host struct
578 *
579 * Return value:
580 * nothing
581 **/
582 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
583 {
584 struct ibmvfc_target *tgt;
585
586 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
587 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
588 dev_err(vhost->dev,
589 "Host initialization retries exceeded. Taking adapter offline\n");
590 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
591 return;
592 }
593 }
594
595 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
596 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
597 vhost->async_crq.cur = 0;
598
599 list_for_each_entry(tgt, &vhost->targets, queue)
600 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
601 scsi_block_requests(vhost->host);
602 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
603 vhost->job_step = ibmvfc_npiv_login;
604 wake_up(&vhost->work_wait_q);
605 }
606 }
607
608 /**
609 * ibmvfc_send_crq - Send a CRQ
610 * @vhost: ibmvfc host struct
611 * @word1: the first 64 bits of the data
612 * @word2: the second 64 bits of the data
613 *
614 * Return value:
615 * 0 on success / other on failure
616 **/
617 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
618 {
619 struct vio_dev *vdev = to_vio_dev(vhost->dev);
620 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
621 }
622
623 /**
624 * ibmvfc_send_crq_init - Send a CRQ init message
625 * @vhost: ibmvfc host struct
626 *
627 * Return value:
628 * 0 on success / other on failure
629 **/
630 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
631 {
632 ibmvfc_dbg(vhost, "Sending CRQ init\n");
633 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
634 }
635
636 /**
637 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
638 * @vhost: ibmvfc host struct
639 *
640 * Return value:
641 * 0 on success / other on failure
642 **/
643 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
644 {
645 ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
646 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
647 }
648
649 /**
650 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
651 * @vhost: ibmvfc host struct
652 *
653 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
654 * the crq with the hypervisor.
655 **/
656 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
657 {
658 long rc = 0;
659 struct vio_dev *vdev = to_vio_dev(vhost->dev);
660 struct ibmvfc_crq_queue *crq = &vhost->crq;
661
662 ibmvfc_dbg(vhost, "Releasing CRQ\n");
663 free_irq(vdev->irq, vhost);
664 tasklet_kill(&vhost->tasklet);
665 do {
666 if (rc)
667 msleep(100);
668 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
669 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
670
671 vhost->state = IBMVFC_NO_CRQ;
672 vhost->logged_in = 0;
673 dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
674 free_page((unsigned long)crq->msgs);
675 }
676
677 /**
678 * ibmvfc_reenable_crq_queue - reenables the CRQ
679 * @vhost: ibmvfc host struct
680 *
681 * Return value:
682 * 0 on success / other on failure
683 **/
684 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
685 {
686 int rc = 0;
687 struct vio_dev *vdev = to_vio_dev(vhost->dev);
688
689 /* Re-enable the CRQ */
690 do {
691 if (rc)
692 msleep(100);
693 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
694 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
695
696 if (rc)
697 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
698
699 return rc;
700 }
701
702 /**
703 * ibmvfc_reset_crq - resets a crq after a failure
704 * @vhost: ibmvfc host struct
705 *
706 * Return value:
707 * 0 on success / other on failure
708 **/
709 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
710 {
711 int rc = 0;
712 unsigned long flags;
713 struct vio_dev *vdev = to_vio_dev(vhost->dev);
714 struct ibmvfc_crq_queue *crq = &vhost->crq;
715
716 /* Close the CRQ */
717 do {
718 if (rc)
719 msleep(100);
720 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
721 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
722
723 spin_lock_irqsave(vhost->host->host_lock, flags);
724 vhost->state = IBMVFC_NO_CRQ;
725 vhost->logged_in = 0;
726 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
727
728 /* Clean out the queue */
729 memset(crq->msgs, 0, PAGE_SIZE);
730 crq->cur = 0;
731
732 /* And re-open it again */
733 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
734 crq->msg_token, PAGE_SIZE);
735
736 if (rc == H_CLOSED)
737 /* Adapter is good, but other end is not ready */
738 dev_warn(vhost->dev, "Partner adapter not ready\n");
739 else if (rc != 0)
740 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
741 spin_unlock_irqrestore(vhost->host->host_lock, flags);
742
743 return rc;
744 }
745
746 /**
747 * ibmvfc_valid_event - Determines if event is valid.
748 * @pool: event_pool that contains the event
749 * @evt: ibmvfc event to be checked for validity
750 *
751 * Return value:
752 * 1 if event is valid / 0 if event is not valid
753 **/
754 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
755 struct ibmvfc_event *evt)
756 {
757 int index = evt - pool->events;
758 if (index < 0 || index >= pool->size) /* outside of bounds */
759 return 0;
760 if (evt != pool->events + index) /* unaligned */
761 return 0;
762 return 1;
763 }
764
765 /**
766 * ibmvfc_free_event - Free the specified event
767 * @evt: ibmvfc_event to be freed
768 *
769 **/
770 static void ibmvfc_free_event(struct ibmvfc_event *evt)
771 {
772 struct ibmvfc_host *vhost = evt->vhost;
773 struct ibmvfc_event_pool *pool = &vhost->pool;
774
775 BUG_ON(!ibmvfc_valid_event(pool, evt));
776 BUG_ON(atomic_inc_return(&evt->free) != 1);
777 list_add_tail(&evt->queue, &vhost->free);
778 }
779
780 /**
781 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
782 * @evt: ibmvfc event struct
783 *
784 * This function does not setup any error status, that must be done
785 * before this function gets called.
786 **/
787 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
788 {
789 struct scsi_cmnd *cmnd = evt->cmnd;
790
791 if (cmnd) {
792 scsi_dma_unmap(cmnd);
793 cmnd->scsi_done(cmnd);
794 }
795
796 if (evt->eh_comp)
797 complete(evt->eh_comp);
798
799 ibmvfc_free_event(evt);
800 }
801
802 /**
803 * ibmvfc_fail_request - Fail request with specified error code
804 * @evt: ibmvfc event struct
805 * @error_code: error code to fail request with
806 *
807 * Return value:
808 * none
809 **/
810 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
811 {
812 if (evt->cmnd) {
813 evt->cmnd->result = (error_code << 16);
814 evt->done = ibmvfc_scsi_eh_done;
815 } else
816 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
817
818 list_del(&evt->queue);
819 del_timer(&evt->timer);
820 ibmvfc_trc_end(evt);
821 evt->done(evt);
822 }
823
824 /**
825 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
826 * @vhost: ibmvfc host struct
827 * @error_code: error code to fail requests with
828 *
829 * Return value:
830 * none
831 **/
832 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
833 {
834 struct ibmvfc_event *evt, *pos;
835
836 ibmvfc_dbg(vhost, "Purging all requests\n");
837 list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
838 ibmvfc_fail_request(evt, error_code);
839 }
840
841 /**
842 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
843 * @vhost: struct ibmvfc host to reset
844 **/
845 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
846 {
847 ibmvfc_purge_requests(vhost, DID_ERROR);
848 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
849 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
850 }
851
852 /**
853 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
854 * @vhost: struct ibmvfc host to reset
855 **/
856 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
857 {
858 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
859 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
860 scsi_block_requests(vhost->host);
861 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
862 vhost->job_step = ibmvfc_npiv_logout;
863 wake_up(&vhost->work_wait_q);
864 } else
865 ibmvfc_hard_reset_host(vhost);
866 }
867
868 /**
869 * ibmvfc_reset_host - Reset the connection to the server
870 * @vhost: ibmvfc host struct
871 **/
872 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
873 {
874 unsigned long flags;
875
876 spin_lock_irqsave(vhost->host->host_lock, flags);
877 __ibmvfc_reset_host(vhost);
878 spin_unlock_irqrestore(vhost->host->host_lock, flags);
879 }
880
881 /**
882 * ibmvfc_retry_host_init - Retry host initialization if allowed
883 * @vhost: ibmvfc host struct
884 *
885 * Returns: 1 if init will be retried / 0 if not
886 *
887 **/
888 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
889 {
890 int retry = 0;
891
892 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
893 vhost->delay_init = 1;
894 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
895 dev_err(vhost->dev,
896 "Host initialization retries exceeded. Taking adapter offline\n");
897 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
898 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
899 __ibmvfc_reset_host(vhost);
900 else {
901 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
902 retry = 1;
903 }
904 }
905
906 wake_up(&vhost->work_wait_q);
907 return retry;
908 }
909
910 /**
911 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
912 * @starget: scsi target struct
913 *
914 * Return value:
915 * ibmvfc_target struct / NULL if not found
916 **/
917 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
918 {
919 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
920 struct ibmvfc_host *vhost = shost_priv(shost);
921 struct ibmvfc_target *tgt;
922
923 list_for_each_entry(tgt, &vhost->targets, queue)
924 if (tgt->target_id == starget->id) {
925 kref_get(&tgt->kref);
926 return tgt;
927 }
928 return NULL;
929 }
930
931 /**
932 * ibmvfc_get_target - Find the specified scsi_target
933 * @starget: scsi target struct
934 *
935 * Return value:
936 * ibmvfc_target struct / NULL if not found
937 **/
938 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
939 {
940 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
941 struct ibmvfc_target *tgt;
942 unsigned long flags;
943
944 spin_lock_irqsave(shost->host_lock, flags);
945 tgt = __ibmvfc_get_target(starget);
946 spin_unlock_irqrestore(shost->host_lock, flags);
947 return tgt;
948 }
949
950 /**
951 * ibmvfc_get_host_speed - Get host port speed
952 * @shost: scsi host struct
953 *
954 * Return value:
955 * none
956 **/
957 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
958 {
959 struct ibmvfc_host *vhost = shost_priv(shost);
960 unsigned long flags;
961
962 spin_lock_irqsave(shost->host_lock, flags);
963 if (vhost->state == IBMVFC_ACTIVE) {
964 switch (vhost->login_buf->resp.link_speed / 100) {
965 case 1:
966 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
967 break;
968 case 2:
969 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
970 break;
971 case 4:
972 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
973 break;
974 case 8:
975 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
976 break;
977 case 10:
978 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
979 break;
980 case 16:
981 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
982 break;
983 default:
984 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
985 vhost->login_buf->resp.link_speed / 100);
986 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
987 break;
988 }
989 } else
990 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
991 spin_unlock_irqrestore(shost->host_lock, flags);
992 }
993
994 /**
995 * ibmvfc_get_host_port_state - Get host port state
996 * @shost: scsi host struct
997 *
998 * Return value:
999 * none
1000 **/
1001 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1002 {
1003 struct ibmvfc_host *vhost = shost_priv(shost);
1004 unsigned long flags;
1005
1006 spin_lock_irqsave(shost->host_lock, flags);
1007 switch (vhost->state) {
1008 case IBMVFC_INITIALIZING:
1009 case IBMVFC_ACTIVE:
1010 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1011 break;
1012 case IBMVFC_LINK_DOWN:
1013 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1014 break;
1015 case IBMVFC_LINK_DEAD:
1016 case IBMVFC_HOST_OFFLINE:
1017 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1018 break;
1019 case IBMVFC_HALTED:
1020 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1021 break;
1022 case IBMVFC_NO_CRQ:
1023 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1024 break;
1025 default:
1026 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1027 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1028 break;
1029 }
1030 spin_unlock_irqrestore(shost->host_lock, flags);
1031 }
1032
1033 /**
1034 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1035 * @rport: rport struct
1036 * @timeout: timeout value
1037 *
1038 * Return value:
1039 * none
1040 **/
1041 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1042 {
1043 if (timeout)
1044 rport->dev_loss_tmo = timeout;
1045 else
1046 rport->dev_loss_tmo = 1;
1047 }
1048
1049 /**
1050 * ibmvfc_release_tgt - Free memory allocated for a target
1051 * @kref: kref struct
1052 *
1053 **/
1054 static void ibmvfc_release_tgt(struct kref *kref)
1055 {
1056 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1057 kfree(tgt);
1058 }
1059
1060 /**
1061 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1062 * @starget: scsi target struct
1063 *
1064 * Return value:
1065 * none
1066 **/
1067 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1068 {
1069 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1070 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1071 if (tgt)
1072 kref_put(&tgt->kref, ibmvfc_release_tgt);
1073 }
1074
1075 /**
1076 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1077 * @starget: scsi target struct
1078 *
1079 * Return value:
1080 * none
1081 **/
1082 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1083 {
1084 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1085 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1086 if (tgt)
1087 kref_put(&tgt->kref, ibmvfc_release_tgt);
1088 }
1089
1090 /**
1091 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1092 * @starget: scsi target struct
1093 *
1094 * Return value:
1095 * none
1096 **/
1097 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1098 {
1099 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1100 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1101 if (tgt)
1102 kref_put(&tgt->kref, ibmvfc_release_tgt);
1103 }
1104
1105 /**
1106 * ibmvfc_wait_while_resetting - Wait while the host resets
1107 * @vhost: ibmvfc host struct
1108 *
1109 * Return value:
1110 * 0 on success / other on failure
1111 **/
1112 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1113 {
1114 long timeout = wait_event_timeout(vhost->init_wait_q,
1115 ((vhost->state == IBMVFC_ACTIVE ||
1116 vhost->state == IBMVFC_HOST_OFFLINE ||
1117 vhost->state == IBMVFC_LINK_DEAD) &&
1118 vhost->action == IBMVFC_HOST_ACTION_NONE),
1119 (init_timeout * HZ));
1120
1121 return timeout ? 0 : -EIO;
1122 }
1123
1124 /**
1125 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1126 * @shost: scsi host struct
1127 *
1128 * Return value:
1129 * 0 on success / other on failure
1130 **/
1131 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1132 {
1133 struct ibmvfc_host *vhost = shost_priv(shost);
1134
1135 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1136 ibmvfc_reset_host(vhost);
1137 return ibmvfc_wait_while_resetting(vhost);
1138 }
1139
1140 /**
1141 * ibmvfc_gather_partition_info - Gather info about the LPAR
1142 *
1143 * Return value:
1144 * none
1145 **/
1146 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1147 {
1148 struct device_node *rootdn;
1149 const char *name;
1150 const unsigned int *num;
1151
1152 rootdn = of_find_node_by_path("/");
1153 if (!rootdn)
1154 return;
1155
1156 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1157 if (name)
1158 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1159 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1160 if (num)
1161 vhost->partition_number = *num;
1162 of_node_put(rootdn);
1163 }
1164
1165 /**
1166 * ibmvfc_set_login_info - Setup info for NPIV login
1167 * @vhost: ibmvfc host struct
1168 *
1169 * Return value:
1170 * none
1171 **/
1172 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1173 {
1174 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1175 struct device_node *of_node = vhost->dev->of_node;
1176 const char *location;
1177
1178 memset(login_info, 0, sizeof(*login_info));
1179
1180 login_info->ostype = IBMVFC_OS_LINUX;
1181 login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1182 login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1183 login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1184 login_info->partition_num = vhost->partition_number;
1185 login_info->vfc_frame_version = 1;
1186 login_info->fcp_version = 3;
1187 login_info->flags = IBMVFC_FLUSH_ON_HALT;
1188 if (vhost->client_migrated)
1189 login_info->flags |= IBMVFC_CLIENT_MIGRATED;
1190
1191 login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1192 login_info->capabilities = IBMVFC_CAN_MIGRATE;
1193 login_info->async.va = vhost->async_crq.msg_token;
1194 login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
1195 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1196 strncpy(login_info->device_name,
1197 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1198
1199 location = of_get_property(of_node, "ibm,loc-code", NULL);
1200 location = location ? location : dev_name(vhost->dev);
1201 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1202 }
1203
1204 /**
1205 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1206 * @vhost: ibmvfc host who owns the event pool
1207 *
1208 * Returns zero on success.
1209 **/
1210 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1211 {
1212 int i;
1213 struct ibmvfc_event_pool *pool = &vhost->pool;
1214
1215 ENTER;
1216 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1217 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1218 if (!pool->events)
1219 return -ENOMEM;
1220
1221 pool->iu_storage = dma_alloc_coherent(vhost->dev,
1222 pool->size * sizeof(*pool->iu_storage),
1223 &pool->iu_token, 0);
1224
1225 if (!pool->iu_storage) {
1226 kfree(pool->events);
1227 return -ENOMEM;
1228 }
1229
1230 for (i = 0; i < pool->size; ++i) {
1231 struct ibmvfc_event *evt = &pool->events[i];
1232 atomic_set(&evt->free, 1);
1233 evt->crq.valid = 0x80;
1234 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1235 evt->xfer_iu = pool->iu_storage + i;
1236 evt->vhost = vhost;
1237 evt->ext_list = NULL;
1238 list_add_tail(&evt->queue, &vhost->free);
1239 }
1240
1241 LEAVE;
1242 return 0;
1243 }
1244
1245 /**
1246 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1247 * @vhost: ibmvfc host who owns the event pool
1248 *
1249 **/
1250 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1251 {
1252 int i;
1253 struct ibmvfc_event_pool *pool = &vhost->pool;
1254
1255 ENTER;
1256 for (i = 0; i < pool->size; ++i) {
1257 list_del(&pool->events[i].queue);
1258 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1259 if (pool->events[i].ext_list)
1260 dma_pool_free(vhost->sg_pool,
1261 pool->events[i].ext_list,
1262 pool->events[i].ext_list_token);
1263 }
1264
1265 kfree(pool->events);
1266 dma_free_coherent(vhost->dev,
1267 pool->size * sizeof(*pool->iu_storage),
1268 pool->iu_storage, pool->iu_token);
1269 LEAVE;
1270 }
1271
1272 /**
1273 * ibmvfc_get_event - Gets the next free event in pool
1274 * @vhost: ibmvfc host struct
1275 *
1276 * Returns a free event from the pool.
1277 **/
1278 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1279 {
1280 struct ibmvfc_event *evt;
1281
1282 BUG_ON(list_empty(&vhost->free));
1283 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1284 atomic_set(&evt->free, 0);
1285 list_del(&evt->queue);
1286 return evt;
1287 }
1288
1289 /**
1290 * ibmvfc_init_event - Initialize fields in an event struct that are always
1291 * required.
1292 * @evt: The event
1293 * @done: Routine to call when the event is responded to
1294 * @format: SRP or MAD format
1295 **/
1296 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1297 void (*done) (struct ibmvfc_event *), u8 format)
1298 {
1299 evt->cmnd = NULL;
1300 evt->sync_iu = NULL;
1301 evt->crq.format = format;
1302 evt->done = done;
1303 evt->eh_comp = NULL;
1304 }
1305
1306 /**
1307 * ibmvfc_map_sg_list - Initialize scatterlist
1308 * @scmd: scsi command struct
1309 * @nseg: number of scatterlist segments
1310 * @md: memory descriptor list to initialize
1311 **/
1312 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1313 struct srp_direct_buf *md)
1314 {
1315 int i;
1316 struct scatterlist *sg;
1317
1318 scsi_for_each_sg(scmd, sg, nseg, i) {
1319 md[i].va = sg_dma_address(sg);
1320 md[i].len = sg_dma_len(sg);
1321 md[i].key = 0;
1322 }
1323 }
1324
1325 /**
1326 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1327 * @scmd: Scsi_Cmnd with the scatterlist
1328 * @evt: ibmvfc event struct
1329 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1330 * @dev: device for which to map dma memory
1331 *
1332 * Returns:
1333 * 0 on success / non-zero on failure
1334 **/
1335 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1336 struct ibmvfc_event *evt,
1337 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1338 {
1339
1340 int sg_mapped;
1341 struct srp_direct_buf *data = &vfc_cmd->ioba;
1342 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1343
1344 sg_mapped = scsi_dma_map(scmd);
1345 if (!sg_mapped) {
1346 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1347 return 0;
1348 } else if (unlikely(sg_mapped < 0)) {
1349 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1350 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1351 return sg_mapped;
1352 }
1353
1354 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1355 vfc_cmd->flags |= IBMVFC_WRITE;
1356 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1357 } else {
1358 vfc_cmd->flags |= IBMVFC_READ;
1359 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1360 }
1361
1362 if (sg_mapped == 1) {
1363 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1364 return 0;
1365 }
1366
1367 vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1368
1369 if (!evt->ext_list) {
1370 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1371 &evt->ext_list_token);
1372
1373 if (!evt->ext_list) {
1374 scsi_dma_unmap(scmd);
1375 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1376 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1377 return -ENOMEM;
1378 }
1379 }
1380
1381 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1382
1383 data->va = evt->ext_list_token;
1384 data->len = sg_mapped * sizeof(struct srp_direct_buf);
1385 data->key = 0;
1386 return 0;
1387 }
1388
1389 /**
1390 * ibmvfc_timeout - Internal command timeout handler
1391 * @evt: struct ibmvfc_event that timed out
1392 *
1393 * Called when an internally generated command times out
1394 **/
1395 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1396 {
1397 struct ibmvfc_host *vhost = evt->vhost;
1398 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1399 ibmvfc_reset_host(vhost);
1400 }
1401
1402 /**
1403 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1404 * @evt: event to be sent
1405 * @vhost: ibmvfc host struct
1406 * @timeout: timeout in seconds - 0 means do not time command
1407 *
1408 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1409 **/
1410 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1411 struct ibmvfc_host *vhost, unsigned long timeout)
1412 {
1413 u64 *crq_as_u64 = (u64 *) &evt->crq;
1414 int rc;
1415
1416 /* Copy the IU into the transfer area */
1417 *evt->xfer_iu = evt->iu;
1418 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1419 evt->xfer_iu->cmd.tag = (u64)evt;
1420 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1421 evt->xfer_iu->mad_common.tag = (u64)evt;
1422 else
1423 BUG();
1424
1425 list_add_tail(&evt->queue, &vhost->sent);
1426 init_timer(&evt->timer);
1427
1428 if (timeout) {
1429 evt->timer.data = (unsigned long) evt;
1430 evt->timer.expires = jiffies + (timeout * HZ);
1431 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1432 add_timer(&evt->timer);
1433 }
1434
1435 mb();
1436
1437 if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1438 list_del(&evt->queue);
1439 del_timer(&evt->timer);
1440
1441 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1442 * Firmware will send a CRQ with a transport event (0xFF) to
1443 * tell this client what has happened to the transport. This
1444 * will be handled in ibmvfc_handle_crq()
1445 */
1446 if (rc == H_CLOSED) {
1447 if (printk_ratelimit())
1448 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1449 if (evt->cmnd)
1450 scsi_dma_unmap(evt->cmnd);
1451 ibmvfc_free_event(evt);
1452 return SCSI_MLQUEUE_HOST_BUSY;
1453 }
1454
1455 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1456 if (evt->cmnd) {
1457 evt->cmnd->result = DID_ERROR << 16;
1458 evt->done = ibmvfc_scsi_eh_done;
1459 } else
1460 evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1461
1462 evt->done(evt);
1463 } else
1464 ibmvfc_trc_start(evt);
1465
1466 return 0;
1467 }
1468
1469 /**
1470 * ibmvfc_log_error - Log an error for the failed command if appropriate
1471 * @evt: ibmvfc event to log
1472 *
1473 **/
1474 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1475 {
1476 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1477 struct ibmvfc_host *vhost = evt->vhost;
1478 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1479 struct scsi_cmnd *cmnd = evt->cmnd;
1480 const char *err = unknown_error;
1481 int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1482 int logerr = 0;
1483 int rsp_code = 0;
1484
1485 if (index >= 0) {
1486 logerr = cmd_status[index].log;
1487 err = cmd_status[index].name;
1488 }
1489
1490 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1491 return;
1492
1493 if (rsp->flags & FCP_RSP_LEN_VALID)
1494 rsp_code = rsp->data.info.rsp_code;
1495
1496 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1497 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1498 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1499 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1500 }
1501
1502 /**
1503 * ibmvfc_relogin - Log back into the specified device
1504 * @sdev: scsi device struct
1505 *
1506 **/
1507 static void ibmvfc_relogin(struct scsi_device *sdev)
1508 {
1509 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1510 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1511 struct ibmvfc_target *tgt;
1512
1513 list_for_each_entry(tgt, &vhost->targets, queue) {
1514 if (rport == tgt->rport) {
1515 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1516 break;
1517 }
1518 }
1519
1520 ibmvfc_reinit_host(vhost);
1521 }
1522
1523 /**
1524 * ibmvfc_scsi_done - Handle responses from commands
1525 * @evt: ibmvfc event to be handled
1526 *
1527 * Used as a callback when sending scsi cmds.
1528 **/
1529 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1530 {
1531 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1532 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1533 struct scsi_cmnd *cmnd = evt->cmnd;
1534 u32 rsp_len = 0;
1535 u32 sense_len = rsp->fcp_sense_len;
1536
1537 if (cmnd) {
1538 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1539 scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1540 else if (rsp->flags & FCP_RESID_UNDER)
1541 scsi_set_resid(cmnd, rsp->fcp_resid);
1542 else
1543 scsi_set_resid(cmnd, 0);
1544
1545 if (vfc_cmd->status) {
1546 cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1547
1548 if (rsp->flags & FCP_RSP_LEN_VALID)
1549 rsp_len = rsp->fcp_rsp_len;
1550 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1551 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1552 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1553 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1554 if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1555 ibmvfc_relogin(cmnd->device);
1556
1557 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1558 cmnd->result = (DID_ERROR << 16);
1559
1560 ibmvfc_log_error(evt);
1561 }
1562
1563 if (!cmnd->result &&
1564 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1565 cmnd->result = (DID_ERROR << 16);
1566
1567 scsi_dma_unmap(cmnd);
1568 cmnd->scsi_done(cmnd);
1569 }
1570
1571 if (evt->eh_comp)
1572 complete(evt->eh_comp);
1573
1574 ibmvfc_free_event(evt);
1575 }
1576
1577 /**
1578 * ibmvfc_host_chkready - Check if the host can accept commands
1579 * @vhost: struct ibmvfc host
1580 *
1581 * Returns:
1582 * 1 if host can accept command / 0 if not
1583 **/
1584 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1585 {
1586 int result = 0;
1587
1588 switch (vhost->state) {
1589 case IBMVFC_LINK_DEAD:
1590 case IBMVFC_HOST_OFFLINE:
1591 result = DID_NO_CONNECT << 16;
1592 break;
1593 case IBMVFC_NO_CRQ:
1594 case IBMVFC_INITIALIZING:
1595 case IBMVFC_HALTED:
1596 case IBMVFC_LINK_DOWN:
1597 result = DID_REQUEUE << 16;
1598 break;
1599 case IBMVFC_ACTIVE:
1600 result = 0;
1601 break;
1602 };
1603
1604 return result;
1605 }
1606
1607 /**
1608 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1609 * @cmnd: struct scsi_cmnd to be executed
1610 * @done: Callback function to be called when cmnd is completed
1611 *
1612 * Returns:
1613 * 0 on success / other on failure
1614 **/
1615 static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
1616 void (*done) (struct scsi_cmnd *))
1617 {
1618 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1619 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1620 struct ibmvfc_cmd *vfc_cmd;
1621 struct ibmvfc_event *evt;
1622 u8 tag[2];
1623 int rc;
1624
1625 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1626 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1627 cmnd->result = rc;
1628 done(cmnd);
1629 return 0;
1630 }
1631
1632 cmnd->result = (DID_OK << 16);
1633 evt = ibmvfc_get_event(vhost);
1634 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1635 evt->cmnd = cmnd;
1636 cmnd->scsi_done = done;
1637 vfc_cmd = &evt->iu.cmd;
1638 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1639 vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1640 vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1641 vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1642 vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1643 vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1644 vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1645 vfc_cmd->tgt_scsi_id = rport->port_id;
1646 vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1647 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1648 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1649
1650 if (scsi_populate_tag_msg(cmnd, tag)) {
1651 vfc_cmd->task_tag = tag[1];
1652 switch (tag[0]) {
1653 case MSG_SIMPLE_TAG:
1654 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1655 break;
1656 case MSG_HEAD_TAG:
1657 vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1658 break;
1659 case MSG_ORDERED_TAG:
1660 vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1661 break;
1662 };
1663 }
1664
1665 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1666 return ibmvfc_send_event(evt, vhost, 0);
1667
1668 ibmvfc_free_event(evt);
1669 if (rc == -ENOMEM)
1670 return SCSI_MLQUEUE_HOST_BUSY;
1671
1672 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1673 scmd_printk(KERN_ERR, cmnd,
1674 "Failed to map DMA buffer for command. rc=%d\n", rc);
1675
1676 cmnd->result = DID_ERROR << 16;
1677 done(cmnd);
1678 return 0;
1679 }
1680
1681 /**
1682 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1683 * @evt: ibmvfc event struct
1684 *
1685 **/
1686 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1687 {
1688 /* copy the response back */
1689 if (evt->sync_iu)
1690 *evt->sync_iu = *evt->xfer_iu;
1691
1692 complete(&evt->comp);
1693 }
1694
1695 /**
1696 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1697 * @evt: struct ibmvfc_event
1698 *
1699 **/
1700 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1701 {
1702 struct ibmvfc_host *vhost = evt->vhost;
1703
1704 ibmvfc_free_event(evt);
1705 vhost->aborting_passthru = 0;
1706 dev_info(vhost->dev, "Passthru command cancelled\n");
1707 }
1708
1709 /**
1710 * ibmvfc_bsg_timeout - Handle a BSG timeout
1711 * @job: struct fc_bsg_job that timed out
1712 *
1713 * Returns:
1714 * 0 on success / other on failure
1715 **/
1716 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1717 {
1718 struct ibmvfc_host *vhost = shost_priv(job->shost);
1719 unsigned long port_id = (unsigned long)job->dd_data;
1720 struct ibmvfc_event *evt;
1721 struct ibmvfc_tmf *tmf;
1722 unsigned long flags;
1723 int rc;
1724
1725 ENTER;
1726 spin_lock_irqsave(vhost->host->host_lock, flags);
1727 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1728 __ibmvfc_reset_host(vhost);
1729 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1730 return 0;
1731 }
1732
1733 vhost->aborting_passthru = 1;
1734 evt = ibmvfc_get_event(vhost);
1735 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1736
1737 tmf = &evt->iu.tmf;
1738 memset(tmf, 0, sizeof(*tmf));
1739 tmf->common.version = 1;
1740 tmf->common.opcode = IBMVFC_TMF_MAD;
1741 tmf->common.length = sizeof(*tmf);
1742 tmf->scsi_id = port_id;
1743 tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1744 tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
1745 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1746
1747 if (rc != 0) {
1748 vhost->aborting_passthru = 0;
1749 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1750 rc = -EIO;
1751 } else
1752 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1753 port_id);
1754
1755 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1756
1757 LEAVE;
1758 return rc;
1759 }
1760
1761 /**
1762 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1763 * @vhost: struct ibmvfc_host to send command
1764 * @port_id: port ID to send command
1765 *
1766 * Returns:
1767 * 0 on success / other on failure
1768 **/
1769 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1770 {
1771 struct ibmvfc_port_login *plogi;
1772 struct ibmvfc_target *tgt;
1773 struct ibmvfc_event *evt;
1774 union ibmvfc_iu rsp_iu;
1775 unsigned long flags;
1776 int rc = 0, issue_login = 1;
1777
1778 ENTER;
1779 spin_lock_irqsave(vhost->host->host_lock, flags);
1780 list_for_each_entry(tgt, &vhost->targets, queue) {
1781 if (tgt->scsi_id == port_id) {
1782 issue_login = 0;
1783 break;
1784 }
1785 }
1786
1787 if (!issue_login)
1788 goto unlock_out;
1789 if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1790 goto unlock_out;
1791
1792 evt = ibmvfc_get_event(vhost);
1793 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1794 plogi = &evt->iu.plogi;
1795 memset(plogi, 0, sizeof(*plogi));
1796 plogi->common.version = 1;
1797 plogi->common.opcode = IBMVFC_PORT_LOGIN;
1798 plogi->common.length = sizeof(*plogi);
1799 plogi->scsi_id = port_id;
1800 evt->sync_iu = &rsp_iu;
1801 init_completion(&evt->comp);
1802
1803 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1804 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1805
1806 if (rc)
1807 return -EIO;
1808
1809 wait_for_completion(&evt->comp);
1810
1811 if (rsp_iu.plogi.common.status)
1812 rc = -EIO;
1813
1814 spin_lock_irqsave(vhost->host->host_lock, flags);
1815 ibmvfc_free_event(evt);
1816 unlock_out:
1817 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1818 LEAVE;
1819 return rc;
1820 }
1821
1822 /**
1823 * ibmvfc_bsg_request - Handle a BSG request
1824 * @job: struct fc_bsg_job to be executed
1825 *
1826 * Returns:
1827 * 0 on success / other on failure
1828 **/
1829 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1830 {
1831 struct ibmvfc_host *vhost = shost_priv(job->shost);
1832 struct fc_rport *rport = job->rport;
1833 struct ibmvfc_passthru_mad *mad;
1834 struct ibmvfc_event *evt;
1835 union ibmvfc_iu rsp_iu;
1836 unsigned long flags, port_id = -1;
1837 unsigned int code = job->request->msgcode;
1838 int rc = 0, req_seg, rsp_seg, issue_login = 0;
1839 u32 fc_flags, rsp_len;
1840
1841 ENTER;
1842 job->reply->reply_payload_rcv_len = 0;
1843 if (rport)
1844 port_id = rport->port_id;
1845
1846 switch (code) {
1847 case FC_BSG_HST_ELS_NOLOGIN:
1848 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1849 (job->request->rqst_data.h_els.port_id[1] << 8) |
1850 job->request->rqst_data.h_els.port_id[2];
1851 case FC_BSG_RPT_ELS:
1852 fc_flags = IBMVFC_FC_ELS;
1853 break;
1854 case FC_BSG_HST_CT:
1855 issue_login = 1;
1856 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1857 (job->request->rqst_data.h_ct.port_id[1] << 8) |
1858 job->request->rqst_data.h_ct.port_id[2];
1859 case FC_BSG_RPT_CT:
1860 fc_flags = IBMVFC_FC_CT_IU;
1861 break;
1862 default:
1863 return -ENOTSUPP;
1864 };
1865
1866 if (port_id == -1)
1867 return -EINVAL;
1868 if (!mutex_trylock(&vhost->passthru_mutex))
1869 return -EBUSY;
1870
1871 job->dd_data = (void *)port_id;
1872 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1873 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1874
1875 if (!req_seg) {
1876 mutex_unlock(&vhost->passthru_mutex);
1877 return -ENOMEM;
1878 }
1879
1880 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1881 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1882
1883 if (!rsp_seg) {
1884 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1885 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1886 mutex_unlock(&vhost->passthru_mutex);
1887 return -ENOMEM;
1888 }
1889
1890 if (req_seg > 1 || rsp_seg > 1) {
1891 rc = -EINVAL;
1892 goto out;
1893 }
1894
1895 if (issue_login)
1896 rc = ibmvfc_bsg_plogi(vhost, port_id);
1897
1898 spin_lock_irqsave(vhost->host->host_lock, flags);
1899
1900 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1901 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1902 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1903 goto out;
1904 }
1905
1906 evt = ibmvfc_get_event(vhost);
1907 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1908 mad = &evt->iu.passthru;
1909
1910 memset(mad, 0, sizeof(*mad));
1911 mad->common.version = 1;
1912 mad->common.opcode = IBMVFC_PASSTHRU;
1913 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
1914
1915 mad->cmd_ioba.va = (u64)evt->crq.ioba +
1916 offsetof(struct ibmvfc_passthru_mad, iu);
1917 mad->cmd_ioba.len = sizeof(mad->iu);
1918
1919 mad->iu.cmd_len = job->request_payload.payload_len;
1920 mad->iu.rsp_len = job->reply_payload.payload_len;
1921 mad->iu.flags = fc_flags;
1922 mad->iu.cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1923
1924 mad->iu.cmd.va = sg_dma_address(job->request_payload.sg_list);
1925 mad->iu.cmd.len = sg_dma_len(job->request_payload.sg_list);
1926 mad->iu.rsp.va = sg_dma_address(job->reply_payload.sg_list);
1927 mad->iu.rsp.len = sg_dma_len(job->reply_payload.sg_list);
1928 mad->iu.scsi_id = port_id;
1929 mad->iu.tag = (u64)evt;
1930 rsp_len = mad->iu.rsp.len;
1931
1932 evt->sync_iu = &rsp_iu;
1933 init_completion(&evt->comp);
1934 rc = ibmvfc_send_event(evt, vhost, 0);
1935 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1936
1937 if (rc) {
1938 rc = -EIO;
1939 goto out;
1940 }
1941
1942 wait_for_completion(&evt->comp);
1943
1944 if (rsp_iu.passthru.common.status)
1945 rc = -EIO;
1946 else
1947 job->reply->reply_payload_rcv_len = rsp_len;
1948
1949 spin_lock_irqsave(vhost->host->host_lock, flags);
1950 ibmvfc_free_event(evt);
1951 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1952 job->reply->result = rc;
1953 job->job_done(job);
1954 rc = 0;
1955 out:
1956 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1957 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1958 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1959 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1960 mutex_unlock(&vhost->passthru_mutex);
1961 LEAVE;
1962 return rc;
1963 }
1964
1965 /**
1966 * ibmvfc_reset_device - Reset the device with the specified reset type
1967 * @sdev: scsi device to reset
1968 * @type: reset type
1969 * @desc: reset type description for log messages
1970 *
1971 * Returns:
1972 * 0 on success / other on failure
1973 **/
1974 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1975 {
1976 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1977 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1978 struct ibmvfc_cmd *tmf;
1979 struct ibmvfc_event *evt = NULL;
1980 union ibmvfc_iu rsp_iu;
1981 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1982 int rsp_rc = -EBUSY;
1983 unsigned long flags;
1984 int rsp_code = 0;
1985
1986 spin_lock_irqsave(vhost->host->host_lock, flags);
1987 if (vhost->state == IBMVFC_ACTIVE) {
1988 evt = ibmvfc_get_event(vhost);
1989 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1990
1991 tmf = &evt->iu.cmd;
1992 memset(tmf, 0, sizeof(*tmf));
1993 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1994 tmf->resp.len = sizeof(tmf->rsp);
1995 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1996 tmf->payload_len = sizeof(tmf->iu);
1997 tmf->resp_len = sizeof(tmf->rsp);
1998 tmf->cancel_key = (unsigned long)sdev->hostdata;
1999 tmf->tgt_scsi_id = rport->port_id;
2000 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2001 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
2002 tmf->iu.tmf_flags = type;
2003 evt->sync_iu = &rsp_iu;
2004
2005 init_completion(&evt->comp);
2006 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2007 }
2008 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2009
2010 if (rsp_rc != 0) {
2011 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2012 desc, rsp_rc);
2013 return -EIO;
2014 }
2015
2016 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2017 wait_for_completion(&evt->comp);
2018
2019 if (rsp_iu.cmd.status)
2020 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2021
2022 if (rsp_code) {
2023 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2024 rsp_code = fc_rsp->data.info.rsp_code;
2025
2026 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2027 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2028 desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2029 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2030 fc_rsp->scsi_status);
2031 rsp_rc = -EIO;
2032 } else
2033 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2034
2035 spin_lock_irqsave(vhost->host->host_lock, flags);
2036 ibmvfc_free_event(evt);
2037 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2038 return rsp_rc;
2039 }
2040
2041 /**
2042 * ibmvfc_match_rport - Match function for specified remote port
2043 * @evt: ibmvfc event struct
2044 * @device: device to match (rport)
2045 *
2046 * Returns:
2047 * 1 if event matches rport / 0 if event does not match rport
2048 **/
2049 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2050 {
2051 struct fc_rport *cmd_rport;
2052
2053 if (evt->cmnd) {
2054 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2055 if (cmd_rport == rport)
2056 return 1;
2057 }
2058 return 0;
2059 }
2060
2061 /**
2062 * ibmvfc_match_target - Match function for specified target
2063 * @evt: ibmvfc event struct
2064 * @device: device to match (starget)
2065 *
2066 * Returns:
2067 * 1 if event matches starget / 0 if event does not match starget
2068 **/
2069 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2070 {
2071 if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2072 return 1;
2073 return 0;
2074 }
2075
2076 /**
2077 * ibmvfc_match_lun - Match function for specified LUN
2078 * @evt: ibmvfc event struct
2079 * @device: device to match (sdev)
2080 *
2081 * Returns:
2082 * 1 if event matches sdev / 0 if event does not match sdev
2083 **/
2084 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2085 {
2086 if (evt->cmnd && evt->cmnd->device == device)
2087 return 1;
2088 return 0;
2089 }
2090
2091 /**
2092 * ibmvfc_wait_for_ops - Wait for ops to complete
2093 * @vhost: ibmvfc host struct
2094 * @device: device to match (starget or sdev)
2095 * @match: match function
2096 *
2097 * Returns:
2098 * SUCCESS / FAILED
2099 **/
2100 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2101 int (*match) (struct ibmvfc_event *, void *))
2102 {
2103 struct ibmvfc_event *evt;
2104 DECLARE_COMPLETION_ONSTACK(comp);
2105 int wait;
2106 unsigned long flags;
2107 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2108
2109 ENTER;
2110 do {
2111 wait = 0;
2112 spin_lock_irqsave(vhost->host->host_lock, flags);
2113 list_for_each_entry(evt, &vhost->sent, queue) {
2114 if (match(evt, device)) {
2115 evt->eh_comp = &comp;
2116 wait++;
2117 }
2118 }
2119 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2120
2121 if (wait) {
2122 timeout = wait_for_completion_timeout(&comp, timeout);
2123
2124 if (!timeout) {
2125 wait = 0;
2126 spin_lock_irqsave(vhost->host->host_lock, flags);
2127 list_for_each_entry(evt, &vhost->sent, queue) {
2128 if (match(evt, device)) {
2129 evt->eh_comp = NULL;
2130 wait++;
2131 }
2132 }
2133 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2134 if (wait)
2135 dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2136 LEAVE;
2137 return wait ? FAILED : SUCCESS;
2138 }
2139 }
2140 } while (wait);
2141
2142 LEAVE;
2143 return SUCCESS;
2144 }
2145
2146 /**
2147 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2148 * @sdev: scsi device to cancel commands
2149 * @type: type of error recovery being performed
2150 *
2151 * This sends a cancel to the VIOS for the specified device. This does
2152 * NOT send any abort to the actual device. That must be done separately.
2153 *
2154 * Returns:
2155 * 0 on success / other on failure
2156 **/
2157 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2158 {
2159 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2160 struct scsi_target *starget = scsi_target(sdev);
2161 struct fc_rport *rport = starget_to_rport(starget);
2162 struct ibmvfc_tmf *tmf;
2163 struct ibmvfc_event *evt, *found_evt;
2164 union ibmvfc_iu rsp;
2165 int rsp_rc = -EBUSY;
2166 unsigned long flags;
2167 u16 status;
2168
2169 ENTER;
2170 spin_lock_irqsave(vhost->host->host_lock, flags);
2171 found_evt = NULL;
2172 list_for_each_entry(evt, &vhost->sent, queue) {
2173 if (evt->cmnd && evt->cmnd->device == sdev) {
2174 found_evt = evt;
2175 break;
2176 }
2177 }
2178
2179 if (!found_evt) {
2180 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2181 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2182 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2183 return 0;
2184 }
2185
2186 if (vhost->state == IBMVFC_ACTIVE) {
2187 evt = ibmvfc_get_event(vhost);
2188 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2189
2190 tmf = &evt->iu.tmf;
2191 memset(tmf, 0, sizeof(*tmf));
2192 tmf->common.version = 1;
2193 tmf->common.opcode = IBMVFC_TMF_MAD;
2194 tmf->common.length = sizeof(*tmf);
2195 tmf->scsi_id = rport->port_id;
2196 int_to_scsilun(sdev->lun, &tmf->lun);
2197 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
2198 tmf->cancel_key = (unsigned long)sdev->hostdata;
2199 tmf->my_cancel_key = (unsigned long)starget->hostdata;
2200
2201 evt->sync_iu = &rsp;
2202 init_completion(&evt->comp);
2203 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2204 }
2205
2206 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2207
2208 if (rsp_rc != 0) {
2209 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2210 return -EIO;
2211 }
2212
2213 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2214
2215 wait_for_completion(&evt->comp);
2216 status = rsp.mad_common.status;
2217 spin_lock_irqsave(vhost->host->host_lock, flags);
2218 ibmvfc_free_event(evt);
2219 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2220
2221 if (status != IBMVFC_MAD_SUCCESS) {
2222 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2223 return -EIO;
2224 }
2225
2226 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2227 return 0;
2228 }
2229
2230 /**
2231 * ibmvfc_match_key - Match function for specified cancel key
2232 * @evt: ibmvfc event struct
2233 * @key: cancel key to match
2234 *
2235 * Returns:
2236 * 1 if event matches key / 0 if event does not match key
2237 **/
2238 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2239 {
2240 unsigned long cancel_key = (unsigned long)key;
2241
2242 if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2243 evt->iu.cmd.cancel_key == cancel_key)
2244 return 1;
2245 return 0;
2246 }
2247
2248 /**
2249 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2250 * @sdev: scsi device to abort commands
2251 *
2252 * This sends an Abort Task Set to the VIOS for the specified device. This does
2253 * NOT send any cancel to the VIOS. That must be done separately.
2254 *
2255 * Returns:
2256 * 0 on success / other on failure
2257 **/
2258 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2259 {
2260 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2261 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2262 struct ibmvfc_cmd *tmf;
2263 struct ibmvfc_event *evt, *found_evt;
2264 union ibmvfc_iu rsp_iu;
2265 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2266 int rc, rsp_rc = -EBUSY;
2267 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2268 int rsp_code = 0;
2269
2270 spin_lock_irqsave(vhost->host->host_lock, flags);
2271 found_evt = NULL;
2272 list_for_each_entry(evt, &vhost->sent, queue) {
2273 if (evt->cmnd && evt->cmnd->device == sdev) {
2274 found_evt = evt;
2275 break;
2276 }
2277 }
2278
2279 if (!found_evt) {
2280 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2281 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2282 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2283 return 0;
2284 }
2285
2286 if (vhost->state == IBMVFC_ACTIVE) {
2287 evt = ibmvfc_get_event(vhost);
2288 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2289
2290 tmf = &evt->iu.cmd;
2291 memset(tmf, 0, sizeof(*tmf));
2292 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
2293 tmf->resp.len = sizeof(tmf->rsp);
2294 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
2295 tmf->payload_len = sizeof(tmf->iu);
2296 tmf->resp_len = sizeof(tmf->rsp);
2297 tmf->cancel_key = (unsigned long)sdev->hostdata;
2298 tmf->tgt_scsi_id = rport->port_id;
2299 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2300 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
2301 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2302 evt->sync_iu = &rsp_iu;
2303
2304 init_completion(&evt->comp);
2305 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2306 }
2307
2308 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2309
2310 if (rsp_rc != 0) {
2311 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2312 return -EIO;
2313 }
2314
2315 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2316 timeout = wait_for_completion_timeout(&evt->comp, timeout);
2317
2318 if (!timeout) {
2319 rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2320 if (!rc) {
2321 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2322 if (rc == SUCCESS)
2323 rc = 0;
2324 }
2325
2326 if (rc) {
2327 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2328 ibmvfc_reset_host(vhost);
2329 rsp_rc = 0;
2330 goto out;
2331 }
2332 }
2333
2334 if (rsp_iu.cmd.status)
2335 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2336
2337 if (rsp_code) {
2338 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2339 rsp_code = fc_rsp->data.info.rsp_code;
2340
2341 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2342 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2343 ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
2344 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2345 fc_rsp->scsi_status);
2346 rsp_rc = -EIO;
2347 } else
2348 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2349
2350 out:
2351 spin_lock_irqsave(vhost->host->host_lock, flags);
2352 ibmvfc_free_event(evt);
2353 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2354 return rsp_rc;
2355 }
2356
2357 /**
2358 * ibmvfc_eh_abort_handler - Abort a command
2359 * @cmd: scsi command to abort
2360 *
2361 * Returns:
2362 * SUCCESS / FAILED
2363 **/
2364 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2365 {
2366 struct scsi_device *sdev = cmd->device;
2367 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2368 int cancel_rc, abort_rc;
2369 int rc = FAILED;
2370
2371 ENTER;
2372 fc_block_scsi_eh(cmd);
2373 ibmvfc_wait_while_resetting(vhost);
2374 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2375 abort_rc = ibmvfc_abort_task_set(sdev);
2376
2377 if (!cancel_rc && !abort_rc)
2378 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2379
2380 LEAVE;
2381 return rc;
2382 }
2383
2384 /**
2385 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2386 * @cmd: scsi command struct
2387 *
2388 * Returns:
2389 * SUCCESS / FAILED
2390 **/
2391 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2392 {
2393 struct scsi_device *sdev = cmd->device;
2394 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2395 int cancel_rc, reset_rc;
2396 int rc = FAILED;
2397
2398 ENTER;
2399 fc_block_scsi_eh(cmd);
2400 ibmvfc_wait_while_resetting(vhost);
2401 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2402 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2403
2404 if (!cancel_rc && !reset_rc)
2405 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2406
2407 LEAVE;
2408 return rc;
2409 }
2410
2411 /**
2412 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2413 * @sdev: scsi device struct
2414 * @data: return code
2415 *
2416 **/
2417 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2418 {
2419 unsigned long *rc = data;
2420 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2421 }
2422
2423 /**
2424 * ibmvfc_eh_target_reset_handler - Reset the target
2425 * @cmd: scsi command struct
2426 *
2427 * Returns:
2428 * SUCCESS / FAILED
2429 **/
2430 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2431 {
2432 struct scsi_device *sdev = cmd->device;
2433 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2434 struct scsi_target *starget = scsi_target(sdev);
2435 int reset_rc;
2436 int rc = FAILED;
2437 unsigned long cancel_rc = 0;
2438
2439 ENTER;
2440 fc_block_scsi_eh(cmd);
2441 ibmvfc_wait_while_resetting(vhost);
2442 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2443 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2444
2445 if (!cancel_rc && !reset_rc)
2446 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2447
2448 LEAVE;
2449 return rc;
2450 }
2451
2452 /**
2453 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2454 * @cmd: struct scsi_cmnd having problems
2455 *
2456 **/
2457 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2458 {
2459 int rc;
2460 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2461
2462 fc_block_scsi_eh(cmd);
2463 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2464 rc = ibmvfc_issue_fc_host_lip(vhost->host);
2465 return rc ? FAILED : SUCCESS;
2466 }
2467
2468 /**
2469 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2470 * @rport: rport struct
2471 *
2472 * Return value:
2473 * none
2474 **/
2475 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2476 {
2477 struct Scsi_Host *shost = rport_to_shost(rport);
2478 struct ibmvfc_host *vhost = shost_priv(shost);
2479 struct fc_rport *dev_rport;
2480 struct scsi_device *sdev;
2481 unsigned long rc;
2482
2483 ENTER;
2484 shost_for_each_device(sdev, shost) {
2485 dev_rport = starget_to_rport(scsi_target(sdev));
2486 if (dev_rport != rport)
2487 continue;
2488 ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2489 ibmvfc_abort_task_set(sdev);
2490 }
2491
2492 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2493
2494 if (rc == FAILED)
2495 ibmvfc_issue_fc_host_lip(shost);
2496 LEAVE;
2497 }
2498
2499 static const struct {
2500 enum ibmvfc_async_event ae;
2501 const char *desc;
2502 } ae_desc [] = {
2503 { IBMVFC_AE_ELS_PLOGI, "PLOGI" },
2504 { IBMVFC_AE_ELS_LOGO, "LOGO" },
2505 { IBMVFC_AE_ELS_PRLO, "PRLO" },
2506 { IBMVFC_AE_SCN_NPORT, "N-Port SCN" },
2507 { IBMVFC_AE_SCN_GROUP, "Group SCN" },
2508 { IBMVFC_AE_SCN_DOMAIN, "Domain SCN" },
2509 { IBMVFC_AE_SCN_FABRIC, "Fabric SCN" },
2510 { IBMVFC_AE_LINK_UP, "Link Up" },
2511 { IBMVFC_AE_LINK_DOWN, "Link Down" },
2512 { IBMVFC_AE_LINK_DEAD, "Link Dead" },
2513 { IBMVFC_AE_HALT, "Halt" },
2514 { IBMVFC_AE_RESUME, "Resume" },
2515 { IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" },
2516 };
2517
2518 static const char *unknown_ae = "Unknown async";
2519
2520 /**
2521 * ibmvfc_get_ae_desc - Get text description for async event
2522 * @ae: async event
2523 *
2524 **/
2525 static const char *ibmvfc_get_ae_desc(u64 ae)
2526 {
2527 int i;
2528
2529 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2530 if (ae_desc[i].ae == ae)
2531 return ae_desc[i].desc;
2532
2533 return unknown_ae;
2534 }
2535
2536 /**
2537 * ibmvfc_handle_async - Handle an async event from the adapter
2538 * @crq: crq to process
2539 * @vhost: ibmvfc host struct
2540 *
2541 **/
2542 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2543 struct ibmvfc_host *vhost)
2544 {
2545 const char *desc = ibmvfc_get_ae_desc(crq->event);
2546 struct ibmvfc_target *tgt;
2547
2548 ibmvfc_log(vhost, 3, "%s event received. scsi_id: %llx, wwpn: %llx,"
2549 " node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
2550
2551 switch (crq->event) {
2552 case IBMVFC_AE_RESUME:
2553 switch (crq->link_state) {
2554 case IBMVFC_AE_LS_LINK_DOWN:
2555 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2556 break;
2557 case IBMVFC_AE_LS_LINK_DEAD:
2558 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2559 break;
2560 case IBMVFC_AE_LS_LINK_UP:
2561 case IBMVFC_AE_LS_LINK_BOUNCED:
2562 default:
2563 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2564 vhost->delay_init = 1;
2565 __ibmvfc_reset_host(vhost);
2566 break;
2567 };
2568
2569 break;
2570 case IBMVFC_AE_LINK_UP:
2571 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2572 vhost->delay_init = 1;
2573 __ibmvfc_reset_host(vhost);
2574 break;
2575 case IBMVFC_AE_SCN_FABRIC:
2576 case IBMVFC_AE_SCN_DOMAIN:
2577 vhost->events_to_log |= IBMVFC_AE_RSCN;
2578 vhost->delay_init = 1;
2579 __ibmvfc_reset_host(vhost);
2580 break;
2581 case IBMVFC_AE_SCN_NPORT:
2582 case IBMVFC_AE_SCN_GROUP:
2583 vhost->events_to_log |= IBMVFC_AE_RSCN;
2584 ibmvfc_reinit_host(vhost);
2585 break;
2586 case IBMVFC_AE_ELS_LOGO:
2587 case IBMVFC_AE_ELS_PRLO:
2588 case IBMVFC_AE_ELS_PLOGI:
2589 list_for_each_entry(tgt, &vhost->targets, queue) {
2590 if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2591 break;
2592 if (crq->scsi_id && tgt->scsi_id != crq->scsi_id)
2593 continue;
2594 if (crq->wwpn && tgt->ids.port_name != crq->wwpn)
2595 continue;
2596 if (crq->node_name && tgt->ids.node_name != crq->node_name)
2597 continue;
2598 if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
2599 tgt->logo_rcvd = 1;
2600 if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
2601 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2602 ibmvfc_reinit_host(vhost);
2603 }
2604 }
2605 break;
2606 case IBMVFC_AE_LINK_DOWN:
2607 case IBMVFC_AE_ADAPTER_FAILED:
2608 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2609 break;
2610 case IBMVFC_AE_LINK_DEAD:
2611 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2612 break;
2613 case IBMVFC_AE_HALT:
2614 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2615 break;
2616 default:
2617 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2618 break;
2619 };
2620 }
2621
2622 /**
2623 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2624 * @crq: Command/Response queue
2625 * @vhost: ibmvfc host struct
2626 *
2627 **/
2628 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2629 {
2630 long rc;
2631 struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2632
2633 switch (crq->valid) {
2634 case IBMVFC_CRQ_INIT_RSP:
2635 switch (crq->format) {
2636 case IBMVFC_CRQ_INIT:
2637 dev_info(vhost->dev, "Partner initialized\n");
2638 /* Send back a response */
2639 rc = ibmvfc_send_crq_init_complete(vhost);
2640 if (rc == 0)
2641 ibmvfc_init_host(vhost);
2642 else
2643 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2644 break;
2645 case IBMVFC_CRQ_INIT_COMPLETE:
2646 dev_info(vhost->dev, "Partner initialization complete\n");
2647 ibmvfc_init_host(vhost);
2648 break;
2649 default:
2650 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2651 }
2652 return;
2653 case IBMVFC_CRQ_XPORT_EVENT:
2654 vhost->state = IBMVFC_NO_CRQ;
2655 vhost->logged_in = 0;
2656 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2657 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2658 /* We need to re-setup the interpartition connection */
2659 dev_info(vhost->dev, "Re-enabling adapter\n");
2660 vhost->client_migrated = 1;
2661 ibmvfc_purge_requests(vhost, DID_REQUEUE);
2662 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2663 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2664 } else {
2665 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2666 ibmvfc_purge_requests(vhost, DID_ERROR);
2667 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2668 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2669 }
2670 return;
2671 case IBMVFC_CRQ_CMD_RSP:
2672 break;
2673 default:
2674 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2675 return;
2676 }
2677
2678 if (crq->format == IBMVFC_ASYNC_EVENT)
2679 return;
2680
2681 /* The only kind of payload CRQs we should get are responses to
2682 * things we send. Make sure this response is to something we
2683 * actually sent
2684 */
2685 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2686 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2687 crq->ioba);
2688 return;
2689 }
2690
2691 if (unlikely(atomic_read(&evt->free))) {
2692 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2693 crq->ioba);
2694 return;
2695 }
2696
2697 del_timer(&evt->timer);
2698 list_del(&evt->queue);
2699 ibmvfc_trc_end(evt);
2700 evt->done(evt);
2701 }
2702
2703 /**
2704 * ibmvfc_scan_finished - Check if the device scan is done.
2705 * @shost: scsi host struct
2706 * @time: current elapsed time
2707 *
2708 * Returns:
2709 * 0 if scan is not done / 1 if scan is done
2710 **/
2711 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2712 {
2713 unsigned long flags;
2714 struct ibmvfc_host *vhost = shost_priv(shost);
2715 int done = 0;
2716
2717 spin_lock_irqsave(shost->host_lock, flags);
2718 if (time >= (init_timeout * HZ)) {
2719 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2720 "continuing initialization\n", init_timeout);
2721 done = 1;
2722 }
2723
2724 if (vhost->scan_complete)
2725 done = 1;
2726 spin_unlock_irqrestore(shost->host_lock, flags);
2727 return done;
2728 }
2729
2730 /**
2731 * ibmvfc_slave_alloc - Setup the device's task set value
2732 * @sdev: struct scsi_device device to configure
2733 *
2734 * Set the device's task set value so that error handling works as
2735 * expected.
2736 *
2737 * Returns:
2738 * 0 on success / -ENXIO if device does not exist
2739 **/
2740 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2741 {
2742 struct Scsi_Host *shost = sdev->host;
2743 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2744 struct ibmvfc_host *vhost = shost_priv(shost);
2745 unsigned long flags = 0;
2746
2747 if (!rport || fc_remote_port_chkready(rport))
2748 return -ENXIO;
2749
2750 spin_lock_irqsave(shost->host_lock, flags);
2751 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2752 spin_unlock_irqrestore(shost->host_lock, flags);
2753 return 0;
2754 }
2755
2756 /**
2757 * ibmvfc_target_alloc - Setup the target's task set value
2758 * @starget: struct scsi_target
2759 *
2760 * Set the target's task set value so that error handling works as
2761 * expected.
2762 *
2763 * Returns:
2764 * 0 on success / -ENXIO if device does not exist
2765 **/
2766 static int ibmvfc_target_alloc(struct scsi_target *starget)
2767 {
2768 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2769 struct ibmvfc_host *vhost = shost_priv(shost);
2770 unsigned long flags = 0;
2771
2772 spin_lock_irqsave(shost->host_lock, flags);
2773 starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2774 spin_unlock_irqrestore(shost->host_lock, flags);
2775 return 0;
2776 }
2777
2778 /**
2779 * ibmvfc_slave_configure - Configure the device
2780 * @sdev: struct scsi_device device to configure
2781 *
2782 * Enable allow_restart for a device if it is a disk. Adjust the
2783 * queue_depth here also.
2784 *
2785 * Returns:
2786 * 0
2787 **/
2788 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2789 {
2790 struct Scsi_Host *shost = sdev->host;
2791 struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
2792 unsigned long flags = 0;
2793
2794 spin_lock_irqsave(shost->host_lock, flags);
2795 if (sdev->type == TYPE_DISK)
2796 sdev->allow_restart = 1;
2797
2798 if (sdev->tagged_supported) {
2799 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2800 scsi_activate_tcq(sdev, sdev->queue_depth);
2801 } else
2802 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2803
2804 rport->dev_loss_tmo = dev_loss_tmo;
2805 spin_unlock_irqrestore(shost->host_lock, flags);
2806 return 0;
2807 }
2808
2809 /**
2810 * ibmvfc_change_queue_depth - Change the device's queue depth
2811 * @sdev: scsi device struct
2812 * @qdepth: depth to set
2813 * @reason: calling context
2814 *
2815 * Return value:
2816 * actual depth set
2817 **/
2818 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
2819 int reason)
2820 {
2821 if (reason != SCSI_QDEPTH_DEFAULT)
2822 return -EOPNOTSUPP;
2823
2824 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2825 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2826
2827 scsi_adjust_queue_depth(sdev, 0, qdepth);
2828 return sdev->queue_depth;
2829 }
2830
2831 /**
2832 * ibmvfc_change_queue_type - Change the device's queue type
2833 * @sdev: scsi device struct
2834 * @tag_type: type of tags to use
2835 *
2836 * Return value:
2837 * actual queue type set
2838 **/
2839 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2840 {
2841 if (sdev->tagged_supported) {
2842 scsi_set_tag_type(sdev, tag_type);
2843
2844 if (tag_type)
2845 scsi_activate_tcq(sdev, sdev->queue_depth);
2846 else
2847 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2848 } else
2849 tag_type = 0;
2850
2851 return tag_type;
2852 }
2853
2854 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2855 struct device_attribute *attr, char *buf)
2856 {
2857 struct Scsi_Host *shost = class_to_shost(dev);
2858 struct ibmvfc_host *vhost = shost_priv(shost);
2859
2860 return snprintf(buf, PAGE_SIZE, "%s\n",
2861 vhost->login_buf->resp.partition_name);
2862 }
2863
2864 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2865 struct device_attribute *attr, char *buf)
2866 {
2867 struct Scsi_Host *shost = class_to_shost(dev);
2868 struct ibmvfc_host *vhost = shost_priv(shost);
2869
2870 return snprintf(buf, PAGE_SIZE, "%s\n",
2871 vhost->login_buf->resp.device_name);
2872 }
2873
2874 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2875 struct device_attribute *attr, char *buf)
2876 {
2877 struct Scsi_Host *shost = class_to_shost(dev);
2878 struct ibmvfc_host *vhost = shost_priv(shost);
2879
2880 return snprintf(buf, PAGE_SIZE, "%s\n",
2881 vhost->login_buf->resp.port_loc_code);
2882 }
2883
2884 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2885 struct device_attribute *attr, char *buf)
2886 {
2887 struct Scsi_Host *shost = class_to_shost(dev);
2888 struct ibmvfc_host *vhost = shost_priv(shost);
2889
2890 return snprintf(buf, PAGE_SIZE, "%s\n",
2891 vhost->login_buf->resp.drc_name);
2892 }
2893
2894 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2895 struct device_attribute *attr, char *buf)
2896 {
2897 struct Scsi_Host *shost = class_to_shost(dev);
2898 struct ibmvfc_host *vhost = shost_priv(shost);
2899 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2900 }
2901
2902 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2903 struct device_attribute *attr, char *buf)
2904 {
2905 struct Scsi_Host *shost = class_to_shost(dev);
2906 struct ibmvfc_host *vhost = shost_priv(shost);
2907 return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2908 }
2909
2910 /**
2911 * ibmvfc_show_log_level - Show the adapter's error logging level
2912 * @dev: class device struct
2913 * @buf: buffer
2914 *
2915 * Return value:
2916 * number of bytes printed to buffer
2917 **/
2918 static ssize_t ibmvfc_show_log_level(struct device *dev,
2919 struct device_attribute *attr, char *buf)
2920 {
2921 struct Scsi_Host *shost = class_to_shost(dev);
2922 struct ibmvfc_host *vhost = shost_priv(shost);
2923 unsigned long flags = 0;
2924 int len;
2925
2926 spin_lock_irqsave(shost->host_lock, flags);
2927 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2928 spin_unlock_irqrestore(shost->host_lock, flags);
2929 return len;
2930 }
2931
2932 /**
2933 * ibmvfc_store_log_level - Change the adapter's error logging level
2934 * @dev: class device struct
2935 * @buf: buffer
2936 *
2937 * Return value:
2938 * number of bytes printed to buffer
2939 **/
2940 static ssize_t ibmvfc_store_log_level(struct device *dev,
2941 struct device_attribute *attr,
2942 const char *buf, size_t count)
2943 {
2944 struct Scsi_Host *shost = class_to_shost(dev);
2945 struct ibmvfc_host *vhost = shost_priv(shost);
2946 unsigned long flags = 0;
2947
2948 spin_lock_irqsave(shost->host_lock, flags);
2949 vhost->log_level = simple_strtoul(buf, NULL, 10);
2950 spin_unlock_irqrestore(shost->host_lock, flags);
2951 return strlen(buf);
2952 }
2953
2954 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
2955 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
2956 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
2957 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
2958 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
2959 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
2960 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
2961 ibmvfc_show_log_level, ibmvfc_store_log_level);
2962
2963 #ifdef CONFIG_SCSI_IBMVFC_TRACE
2964 /**
2965 * ibmvfc_read_trace - Dump the adapter trace
2966 * @filp: open sysfs file
2967 * @kobj: kobject struct
2968 * @bin_attr: bin_attribute struct
2969 * @buf: buffer
2970 * @off: offset
2971 * @count: buffer size
2972 *
2973 * Return value:
2974 * number of bytes printed to buffer
2975 **/
2976 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
2977 struct bin_attribute *bin_attr,
2978 char *buf, loff_t off, size_t count)
2979 {
2980 struct device *dev = container_of(kobj, struct device, kobj);
2981 struct Scsi_Host *shost = class_to_shost(dev);
2982 struct ibmvfc_host *vhost = shost_priv(shost);
2983 unsigned long flags = 0;
2984 int size = IBMVFC_TRACE_SIZE;
2985 char *src = (char *)vhost->trace;
2986
2987 if (off > size)
2988 return 0;
2989 if (off + count > size) {
2990 size -= off;
2991 count = size;
2992 }
2993
2994 spin_lock_irqsave(shost->host_lock, flags);
2995 memcpy(buf, &src[off], count);
2996 spin_unlock_irqrestore(shost->host_lock, flags);
2997 return count;
2998 }
2999
3000 static struct bin_attribute ibmvfc_trace_attr = {
3001 .attr = {
3002 .name = "trace",
3003 .mode = S_IRUGO,
3004 },
3005 .size = 0,
3006 .read = ibmvfc_read_trace,
3007 };
3008 #endif
3009
3010 static struct device_attribute *ibmvfc_attrs[] = {
3011 &dev_attr_partition_name,
3012 &dev_attr_device_name,
3013 &dev_attr_port_loc_code,
3014 &dev_attr_drc_name,
3015 &dev_attr_npiv_version,
3016 &dev_attr_capabilities,
3017 &dev_attr_log_level,
3018 NULL
3019 };
3020
3021 static struct scsi_host_template driver_template = {
3022 .module = THIS_MODULE,
3023 .name = "IBM POWER Virtual FC Adapter",
3024 .proc_name = IBMVFC_NAME,
3025 .queuecommand = ibmvfc_queuecommand,
3026 .eh_abort_handler = ibmvfc_eh_abort_handler,
3027 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3028 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3029 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3030 .slave_alloc = ibmvfc_slave_alloc,
3031 .slave_configure = ibmvfc_slave_configure,
3032 .target_alloc = ibmvfc_target_alloc,
3033 .scan_finished = ibmvfc_scan_finished,
3034 .change_queue_depth = ibmvfc_change_queue_depth,
3035 .change_queue_type = ibmvfc_change_queue_type,
3036 .cmd_per_lun = 16,
3037 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3038 .this_id = -1,
3039 .sg_tablesize = SG_ALL,
3040 .max_sectors = IBMVFC_MAX_SECTORS,
3041 .use_clustering = ENABLE_CLUSTERING,
3042 .shost_attrs = ibmvfc_attrs,
3043 };
3044
3045 /**
3046 * ibmvfc_next_async_crq - Returns the next entry in async queue
3047 * @vhost: ibmvfc host struct
3048 *
3049 * Returns:
3050 * Pointer to next entry in queue / NULL if empty
3051 **/
3052 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3053 {
3054 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3055 struct ibmvfc_async_crq *crq;
3056
3057 crq = &async_crq->msgs[async_crq->cur];
3058 if (crq->valid & 0x80) {
3059 if (++async_crq->cur == async_crq->size)
3060 async_crq->cur = 0;
3061 rmb();
3062 } else
3063 crq = NULL;
3064
3065 return crq;
3066 }
3067
3068 /**
3069 * ibmvfc_next_crq - Returns the next entry in message queue
3070 * @vhost: ibmvfc host struct
3071 *
3072 * Returns:
3073 * Pointer to next entry in queue / NULL if empty
3074 **/
3075 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3076 {
3077 struct ibmvfc_crq_queue *queue = &vhost->crq;
3078 struct ibmvfc_crq *crq;
3079
3080 crq = &queue->msgs[queue->cur];
3081 if (crq->valid & 0x80) {
3082 if (++queue->cur == queue->size)
3083 queue->cur = 0;
3084 rmb();
3085 } else
3086 crq = NULL;
3087
3088 return crq;
3089 }
3090
3091 /**
3092 * ibmvfc_interrupt - Interrupt handler
3093 * @irq: number of irq to handle, not used
3094 * @dev_instance: ibmvfc_host that received interrupt
3095 *
3096 * Returns:
3097 * IRQ_HANDLED
3098 **/
3099 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3100 {
3101 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3102 unsigned long flags;
3103
3104 spin_lock_irqsave(vhost->host->host_lock, flags);
3105 vio_disable_interrupts(to_vio_dev(vhost->dev));
3106 tasklet_schedule(&vhost->tasklet);
3107 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3108 return IRQ_HANDLED;
3109 }
3110
3111 /**
3112 * ibmvfc_tasklet - Interrupt handler tasklet
3113 * @data: ibmvfc host struct
3114 *
3115 * Returns:
3116 * Nothing
3117 **/
3118 static void ibmvfc_tasklet(void *data)
3119 {
3120 struct ibmvfc_host *vhost = data;
3121 struct vio_dev *vdev = to_vio_dev(vhost->dev);
3122 struct ibmvfc_crq *crq;
3123 struct ibmvfc_async_crq *async;
3124 unsigned long flags;
3125 int done = 0;
3126
3127 spin_lock_irqsave(vhost->host->host_lock, flags);
3128 while (!done) {
3129 /* Pull all the valid messages off the async CRQ */
3130 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3131 ibmvfc_handle_async(async, vhost);
3132 async->valid = 0;
3133 wmb();
3134 }
3135
3136 /* Pull all the valid messages off the CRQ */
3137 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3138 ibmvfc_handle_crq(crq, vhost);
3139 crq->valid = 0;
3140 wmb();
3141 }
3142
3143 vio_enable_interrupts(vdev);
3144 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3145 vio_disable_interrupts(vdev);
3146 ibmvfc_handle_async(async, vhost);
3147 async->valid = 0;
3148 wmb();
3149 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3150 vio_disable_interrupts(vdev);
3151 ibmvfc_handle_crq(crq, vhost);
3152 crq->valid = 0;
3153 wmb();
3154 } else
3155 done = 1;
3156 }
3157
3158 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3159 }
3160
3161 /**
3162 * ibmvfc_init_tgt - Set the next init job step for the target
3163 * @tgt: ibmvfc target struct
3164 * @job_step: job step to perform
3165 *
3166 **/
3167 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3168 void (*job_step) (struct ibmvfc_target *))
3169 {
3170 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3171 tgt->job_step = job_step;
3172 wake_up(&tgt->vhost->work_wait_q);
3173 }
3174
3175 /**
3176 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3177 * @tgt: ibmvfc target struct
3178 * @job_step: initialization job step
3179 *
3180 * Returns: 1 if step will be retried / 0 if not
3181 *
3182 **/
3183 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3184 void (*job_step) (struct ibmvfc_target *))
3185 {
3186 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3187 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3188 wake_up(&tgt->vhost->work_wait_q);
3189 return 0;
3190 } else
3191 ibmvfc_init_tgt(tgt, job_step);
3192 return 1;
3193 }
3194
3195 /* Defined in FC-LS */
3196 static const struct {
3197 int code;
3198 int retry;
3199 int logged_in;
3200 } prli_rsp [] = {
3201 { 0, 1, 0 },
3202 { 1, 0, 1 },
3203 { 2, 1, 0 },
3204 { 3, 1, 0 },
3205 { 4, 0, 0 },
3206 { 5, 0, 0 },
3207 { 6, 0, 1 },
3208 { 7, 0, 0 },
3209 { 8, 1, 0 },
3210 };
3211
3212 /**
3213 * ibmvfc_get_prli_rsp - Find PRLI response index
3214 * @flags: PRLI response flags
3215 *
3216 **/
3217 static int ibmvfc_get_prli_rsp(u16 flags)
3218 {
3219 int i;
3220 int code = (flags & 0x0f00) >> 8;
3221
3222 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3223 if (prli_rsp[i].code == code)
3224 return i;
3225
3226 return 0;
3227 }
3228
3229 /**
3230 * ibmvfc_tgt_prli_done - Completion handler for Process Login
3231 * @evt: ibmvfc event struct
3232 *
3233 **/
3234 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3235 {
3236 struct ibmvfc_target *tgt = evt->tgt;
3237 struct ibmvfc_host *vhost = evt->vhost;
3238 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3239 struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3240 u32 status = rsp->common.status;
3241 int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3242
3243 vhost->discovery_threads--;
3244 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3245 switch (status) {
3246 case IBMVFC_MAD_SUCCESS:
3247 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3248 parms->type, parms->flags, parms->service_parms);
3249
3250 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3251 index = ibmvfc_get_prli_rsp(parms->flags);
3252 if (prli_rsp[index].logged_in) {
3253 if (parms->flags & IBMVFC_PRLI_EST_IMG_PAIR) {
3254 tgt->need_login = 0;
3255 tgt->ids.roles = 0;
3256 if (parms->service_parms & IBMVFC_PRLI_TARGET_FUNC)
3257 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3258 if (parms->service_parms & IBMVFC_PRLI_INITIATOR_FUNC)
3259 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3260 tgt->add_rport = 1;
3261 } else
3262 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3263 } else if (prli_rsp[index].retry)
3264 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3265 else
3266 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3267 } else
3268 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3269 break;
3270 case IBMVFC_MAD_DRIVER_FAILED:
3271 break;
3272 case IBMVFC_MAD_CRQ_ERROR:
3273 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3274 break;
3275 case IBMVFC_MAD_FAILED:
3276 default:
3277 if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
3278 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3279 else if (tgt->logo_rcvd)
3280 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3281 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3282 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3283 else
3284 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3285
3286 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3287 ibmvfc_get_cmd_error(rsp->status, rsp->error),
3288 rsp->status, rsp->error, status);
3289 break;
3290 };
3291
3292 kref_put(&tgt->kref, ibmvfc_release_tgt);
3293 ibmvfc_free_event(evt);
3294 wake_up(&vhost->work_wait_q);
3295 }
3296
3297 /**
3298 * ibmvfc_tgt_send_prli - Send a process login
3299 * @tgt: ibmvfc target struct
3300 *
3301 **/
3302 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3303 {
3304 struct ibmvfc_process_login *prli;
3305 struct ibmvfc_host *vhost = tgt->vhost;
3306 struct ibmvfc_event *evt;
3307
3308 if (vhost->discovery_threads >= disc_threads)
3309 return;
3310
3311 kref_get(&tgt->kref);
3312 evt = ibmvfc_get_event(vhost);
3313 vhost->discovery_threads++;
3314 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3315 evt->tgt = tgt;
3316 prli = &evt->iu.prli;
3317 memset(prli, 0, sizeof(*prli));
3318 prli->common.version = 1;
3319 prli->common.opcode = IBMVFC_PROCESS_LOGIN;
3320 prli->common.length = sizeof(*prli);
3321 prli->scsi_id = tgt->scsi_id;
3322
3323 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3324 prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
3325 prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
3326
3327 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3328 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3329 vhost->discovery_threads--;
3330 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3331 kref_put(&tgt->kref, ibmvfc_release_tgt);
3332 } else
3333 tgt_dbg(tgt, "Sent process login\n");
3334 }
3335
3336 /**
3337 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3338 * @evt: ibmvfc event struct
3339 *
3340 **/
3341 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3342 {
3343 struct ibmvfc_target *tgt = evt->tgt;
3344 struct ibmvfc_host *vhost = evt->vhost;
3345 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3346 u32 status = rsp->common.status;
3347 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3348
3349 vhost->discovery_threads--;
3350 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3351 switch (status) {
3352 case IBMVFC_MAD_SUCCESS:
3353 tgt_dbg(tgt, "Port Login succeeded\n");
3354 if (tgt->ids.port_name &&
3355 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3356 vhost->reinit = 1;
3357 tgt_dbg(tgt, "Port re-init required\n");
3358 break;
3359 }
3360 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3361 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3362 tgt->ids.port_id = tgt->scsi_id;
3363 memcpy(&tgt->service_parms, &rsp->service_parms,
3364 sizeof(tgt->service_parms));
3365 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3366 sizeof(tgt->service_parms_change));
3367 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
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_plogi);
3373 break;
3374 case IBMVFC_MAD_FAILED:
3375 default:
3376 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3377 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3378 else
3379 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3380
3381 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3382 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3383 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3384 ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
3385 break;
3386 };
3387
3388 kref_put(&tgt->kref, ibmvfc_release_tgt);
3389 ibmvfc_free_event(evt);
3390 wake_up(&vhost->work_wait_q);
3391 }
3392
3393 /**
3394 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3395 * @tgt: ibmvfc target struct
3396 *
3397 **/
3398 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3399 {
3400 struct ibmvfc_port_login *plogi;
3401 struct ibmvfc_host *vhost = tgt->vhost;
3402 struct ibmvfc_event *evt;
3403
3404 if (vhost->discovery_threads >= disc_threads)
3405 return;
3406
3407 kref_get(&tgt->kref);
3408 tgt->logo_rcvd = 0;
3409 evt = ibmvfc_get_event(vhost);
3410 vhost->discovery_threads++;
3411 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3412 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3413 evt->tgt = tgt;
3414 plogi = &evt->iu.plogi;
3415 memset(plogi, 0, sizeof(*plogi));
3416 plogi->common.version = 1;
3417 plogi->common.opcode = IBMVFC_PORT_LOGIN;
3418 plogi->common.length = sizeof(*plogi);
3419 plogi->scsi_id = tgt->scsi_id;
3420
3421 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3422 vhost->discovery_threads--;
3423 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3424 kref_put(&tgt->kref, ibmvfc_release_tgt);
3425 } else
3426 tgt_dbg(tgt, "Sent port login\n");
3427 }
3428
3429 /**
3430 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3431 * @evt: ibmvfc event struct
3432 *
3433 **/
3434 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3435 {
3436 struct ibmvfc_target *tgt = evt->tgt;
3437 struct ibmvfc_host *vhost = evt->vhost;
3438 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3439 u32 status = rsp->common.status;
3440
3441 vhost->discovery_threads--;
3442 ibmvfc_free_event(evt);
3443 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3444
3445 switch (status) {
3446 case IBMVFC_MAD_SUCCESS:
3447 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3448 break;
3449 case IBMVFC_MAD_DRIVER_FAILED:
3450 kref_put(&tgt->kref, ibmvfc_release_tgt);
3451 wake_up(&vhost->work_wait_q);
3452 return;
3453 case IBMVFC_MAD_FAILED:
3454 default:
3455 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3456 break;
3457 };
3458
3459 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3460 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3461 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3462 tgt->scsi_id != tgt->new_scsi_id)
3463 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3464 kref_put(&tgt->kref, ibmvfc_release_tgt);
3465 wake_up(&vhost->work_wait_q);
3466 }
3467
3468 /**
3469 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3470 * @tgt: ibmvfc target struct
3471 *
3472 **/
3473 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3474 {
3475 struct ibmvfc_implicit_logout *mad;
3476 struct ibmvfc_host *vhost = tgt->vhost;
3477 struct ibmvfc_event *evt;
3478
3479 if (vhost->discovery_threads >= disc_threads)
3480 return;
3481
3482 kref_get(&tgt->kref);
3483 evt = ibmvfc_get_event(vhost);
3484 vhost->discovery_threads++;
3485 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3486 evt->tgt = tgt;
3487 mad = &evt->iu.implicit_logout;
3488 memset(mad, 0, sizeof(*mad));
3489 mad->common.version = 1;
3490 mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
3491 mad->common.length = sizeof(*mad);
3492 mad->old_scsi_id = tgt->scsi_id;
3493
3494 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3495 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3496 vhost->discovery_threads--;
3497 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3498 kref_put(&tgt->kref, ibmvfc_release_tgt);
3499 } else
3500 tgt_dbg(tgt, "Sent Implicit Logout\n");
3501 }
3502
3503 /**
3504 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3505 * @mad: ibmvfc passthru mad struct
3506 * @tgt: ibmvfc target struct
3507 *
3508 * Returns:
3509 * 1 if PLOGI needed / 0 if PLOGI not needed
3510 **/
3511 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3512 struct ibmvfc_target *tgt)
3513 {
3514 if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3515 sizeof(tgt->ids.port_name)))
3516 return 1;
3517 if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3518 sizeof(tgt->ids.node_name)))
3519 return 1;
3520 if (mad->fc_iu.response[6] != tgt->scsi_id)
3521 return 1;
3522 return 0;
3523 }
3524
3525 /**
3526 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3527 * @evt: ibmvfc event struct
3528 *
3529 **/
3530 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3531 {
3532 struct ibmvfc_target *tgt = evt->tgt;
3533 struct ibmvfc_host *vhost = evt->vhost;
3534 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3535 u32 status = mad->common.status;
3536 u8 fc_reason, fc_explain;
3537
3538 vhost->discovery_threads--;
3539 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3540 del_timer(&tgt->timer);
3541
3542 switch (status) {
3543 case IBMVFC_MAD_SUCCESS:
3544 tgt_dbg(tgt, "ADISC succeeded\n");
3545 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3546 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3547 break;
3548 case IBMVFC_MAD_DRIVER_FAILED:
3549 break;
3550 case IBMVFC_MAD_FAILED:
3551 default:
3552 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3553 fc_reason = (mad->fc_iu.response[1] & 0x00ff0000) >> 16;
3554 fc_explain = (mad->fc_iu.response[1] & 0x0000ff00) >> 8;
3555 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3556 ibmvfc_get_cmd_error(mad->iu.status, mad->iu.error),
3557 mad->iu.status, mad->iu.error,
3558 ibmvfc_get_fc_type(fc_reason), fc_reason,
3559 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3560 break;
3561 };
3562
3563 kref_put(&tgt->kref, ibmvfc_release_tgt);
3564 ibmvfc_free_event(evt);
3565 wake_up(&vhost->work_wait_q);
3566 }
3567
3568 /**
3569 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3570 * @evt: ibmvfc event struct
3571 *
3572 **/
3573 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3574 {
3575 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3576
3577 memset(mad, 0, sizeof(*mad));
3578 mad->common.version = 1;
3579 mad->common.opcode = IBMVFC_PASSTHRU;
3580 mad->common.length = sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu);
3581 mad->cmd_ioba.va = (u64)evt->crq.ioba +
3582 offsetof(struct ibmvfc_passthru_mad, iu);
3583 mad->cmd_ioba.len = sizeof(mad->iu);
3584 mad->iu.cmd_len = sizeof(mad->fc_iu.payload);
3585 mad->iu.rsp_len = sizeof(mad->fc_iu.response);
3586 mad->iu.cmd.va = (u64)evt->crq.ioba +
3587 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3588 offsetof(struct ibmvfc_passthru_fc_iu, payload);
3589 mad->iu.cmd.len = sizeof(mad->fc_iu.payload);
3590 mad->iu.rsp.va = (u64)evt->crq.ioba +
3591 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3592 offsetof(struct ibmvfc_passthru_fc_iu, response);
3593 mad->iu.rsp.len = sizeof(mad->fc_iu.response);
3594 }
3595
3596 /**
3597 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3598 * @evt: ibmvfc event struct
3599 *
3600 * Just cleanup this event struct. Everything else is handled by
3601 * the ADISC completion handler. If the ADISC never actually comes
3602 * back, we still have the timer running on the ADISC event struct
3603 * which will fire and cause the CRQ to get reset.
3604 *
3605 **/
3606 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3607 {
3608 struct ibmvfc_host *vhost = evt->vhost;
3609 struct ibmvfc_target *tgt = evt->tgt;
3610
3611 tgt_dbg(tgt, "ADISC cancel complete\n");
3612 vhost->abort_threads--;
3613 ibmvfc_free_event(evt);
3614 kref_put(&tgt->kref, ibmvfc_release_tgt);
3615 wake_up(&vhost->work_wait_q);
3616 }
3617
3618 /**
3619 * ibmvfc_adisc_timeout - Handle an ADISC timeout
3620 * @tgt: ibmvfc target struct
3621 *
3622 * If an ADISC times out, send a cancel. If the cancel times
3623 * out, reset the CRQ. When the ADISC comes back as cancelled,
3624 * log back into the target.
3625 **/
3626 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3627 {
3628 struct ibmvfc_host *vhost = tgt->vhost;
3629 struct ibmvfc_event *evt;
3630 struct ibmvfc_tmf *tmf;
3631 unsigned long flags;
3632 int rc;
3633
3634 tgt_dbg(tgt, "ADISC timeout\n");
3635 spin_lock_irqsave(vhost->host->host_lock, flags);
3636 if (vhost->abort_threads >= disc_threads ||
3637 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3638 vhost->state != IBMVFC_INITIALIZING ||
3639 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3640 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3641 return;
3642 }
3643
3644 vhost->abort_threads++;
3645 kref_get(&tgt->kref);
3646 evt = ibmvfc_get_event(vhost);
3647 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3648
3649 evt->tgt = tgt;
3650 tmf = &evt->iu.tmf;
3651 memset(tmf, 0, sizeof(*tmf));
3652 tmf->common.version = 1;
3653 tmf->common.opcode = IBMVFC_TMF_MAD;
3654 tmf->common.length = sizeof(*tmf);
3655 tmf->scsi_id = tgt->scsi_id;
3656 tmf->cancel_key = tgt->cancel_key;
3657
3658 rc = ibmvfc_send_event(evt, vhost, default_timeout);
3659
3660 if (rc) {
3661 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3662 vhost->abort_threads--;
3663 kref_put(&tgt->kref, ibmvfc_release_tgt);
3664 __ibmvfc_reset_host(vhost);
3665 } else
3666 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3667 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3668 }
3669
3670 /**
3671 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3672 * @tgt: ibmvfc target struct
3673 *
3674 * When sending an ADISC we end up with two timers running. The
3675 * first timer is the timer in the ibmvfc target struct. If this
3676 * fires, we send a cancel to the target. The second timer is the
3677 * timer on the ibmvfc event for the ADISC, which is longer. If that
3678 * fires, it means the ADISC timed out and our attempt to cancel it
3679 * also failed, so we need to reset the CRQ.
3680 **/
3681 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3682 {
3683 struct ibmvfc_passthru_mad *mad;
3684 struct ibmvfc_host *vhost = tgt->vhost;
3685 struct ibmvfc_event *evt;
3686
3687 if (vhost->discovery_threads >= disc_threads)
3688 return;
3689
3690 kref_get(&tgt->kref);
3691 evt = ibmvfc_get_event(vhost);
3692 vhost->discovery_threads++;
3693 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3694 evt->tgt = tgt;
3695
3696 ibmvfc_init_passthru(evt);
3697 mad = &evt->iu.passthru;
3698 mad->iu.flags = IBMVFC_FC_ELS;
3699 mad->iu.scsi_id = tgt->scsi_id;
3700 mad->iu.cancel_key = tgt->cancel_key;
3701
3702 mad->fc_iu.payload[0] = IBMVFC_ADISC;
3703 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3704 sizeof(vhost->login_buf->resp.port_name));
3705 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3706 sizeof(vhost->login_buf->resp.node_name));
3707 mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
3708
3709 if (timer_pending(&tgt->timer))
3710 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3711 else {
3712 tgt->timer.data = (unsigned long) tgt;
3713 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3714 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3715 add_timer(&tgt->timer);
3716 }
3717
3718 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3719 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3720 vhost->discovery_threads--;
3721 del_timer(&tgt->timer);
3722 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3723 kref_put(&tgt->kref, ibmvfc_release_tgt);
3724 } else
3725 tgt_dbg(tgt, "Sent ADISC\n");
3726 }
3727
3728 /**
3729 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3730 * @evt: ibmvfc event struct
3731 *
3732 **/
3733 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3734 {
3735 struct ibmvfc_target *tgt = evt->tgt;
3736 struct ibmvfc_host *vhost = evt->vhost;
3737 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3738 u32 status = rsp->common.status;
3739 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3740
3741 vhost->discovery_threads--;
3742 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3743 switch (status) {
3744 case IBMVFC_MAD_SUCCESS:
3745 tgt_dbg(tgt, "Query Target succeeded\n");
3746 tgt->new_scsi_id = rsp->scsi_id;
3747 if (rsp->scsi_id != tgt->scsi_id)
3748 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3749 else
3750 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3751 break;
3752 case IBMVFC_MAD_DRIVER_FAILED:
3753 break;
3754 case IBMVFC_MAD_CRQ_ERROR:
3755 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3756 break;
3757 case IBMVFC_MAD_FAILED:
3758 default:
3759 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3760 rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3761 rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
3762 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3763 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3764 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3765 else
3766 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3767
3768 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3769 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
3770 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
3771 ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
3772 break;
3773 };
3774
3775 kref_put(&tgt->kref, ibmvfc_release_tgt);
3776 ibmvfc_free_event(evt);
3777 wake_up(&vhost->work_wait_q);
3778 }
3779
3780 /**
3781 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3782 * @tgt: ibmvfc target struct
3783 *
3784 **/
3785 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3786 {
3787 struct ibmvfc_query_tgt *query_tgt;
3788 struct ibmvfc_host *vhost = tgt->vhost;
3789 struct ibmvfc_event *evt;
3790
3791 if (vhost->discovery_threads >= disc_threads)
3792 return;
3793
3794 kref_get(&tgt->kref);
3795 evt = ibmvfc_get_event(vhost);
3796 vhost->discovery_threads++;
3797 evt->tgt = tgt;
3798 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3799 query_tgt = &evt->iu.query_tgt;
3800 memset(query_tgt, 0, sizeof(*query_tgt));
3801 query_tgt->common.version = 1;
3802 query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
3803 query_tgt->common.length = sizeof(*query_tgt);
3804 query_tgt->wwpn = tgt->ids.port_name;
3805
3806 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3807 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3808 vhost->discovery_threads--;
3809 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3810 kref_put(&tgt->kref, ibmvfc_release_tgt);
3811 } else
3812 tgt_dbg(tgt, "Sent Query Target\n");
3813 }
3814
3815 /**
3816 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3817 * @vhost: ibmvfc host struct
3818 * @scsi_id: SCSI ID to allocate target for
3819 *
3820 * Returns:
3821 * 0 on success / other on failure
3822 **/
3823 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3824 {
3825 struct ibmvfc_target *tgt;
3826 unsigned long flags;
3827
3828 spin_lock_irqsave(vhost->host->host_lock, flags);
3829 list_for_each_entry(tgt, &vhost->targets, queue) {
3830 if (tgt->scsi_id == scsi_id) {
3831 if (tgt->need_login)
3832 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3833 goto unlock_out;
3834 }
3835 }
3836 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3837
3838 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3839 if (!tgt) {
3840 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3841 scsi_id);
3842 return -ENOMEM;
3843 }
3844
3845 memset(tgt, 0, sizeof(*tgt));
3846 tgt->scsi_id = scsi_id;
3847 tgt->new_scsi_id = scsi_id;
3848 tgt->vhost = vhost;
3849 tgt->need_login = 1;
3850 tgt->cancel_key = vhost->task_set++;
3851 init_timer(&tgt->timer);
3852 kref_init(&tgt->kref);
3853 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3854 spin_lock_irqsave(vhost->host->host_lock, flags);
3855 list_add_tail(&tgt->queue, &vhost->targets);
3856
3857 unlock_out:
3858 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3859 return 0;
3860 }
3861
3862 /**
3863 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3864 * @vhost: ibmvfc host struct
3865 *
3866 * Returns:
3867 * 0 on success / other on failure
3868 **/
3869 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3870 {
3871 int i, rc;
3872
3873 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3874 rc = ibmvfc_alloc_target(vhost,
3875 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3876
3877 return rc;
3878 }
3879
3880 /**
3881 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3882 * @evt: ibmvfc event struct
3883 *
3884 **/
3885 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3886 {
3887 struct ibmvfc_host *vhost = evt->vhost;
3888 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3889 u32 mad_status = rsp->common.status;
3890 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3891
3892 switch (mad_status) {
3893 case IBMVFC_MAD_SUCCESS:
3894 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3895 vhost->num_targets = rsp->num_written;
3896 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3897 break;
3898 case IBMVFC_MAD_FAILED:
3899 level += ibmvfc_retry_host_init(vhost);
3900 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3901 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3902 break;
3903 case IBMVFC_MAD_DRIVER_FAILED:
3904 break;
3905 default:
3906 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3907 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3908 break;
3909 }
3910
3911 ibmvfc_free_event(evt);
3912 wake_up(&vhost->work_wait_q);
3913 }
3914
3915 /**
3916 * ibmvfc_discover_targets - Send Discover Targets MAD
3917 * @vhost: ibmvfc host struct
3918 *
3919 **/
3920 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3921 {
3922 struct ibmvfc_discover_targets *mad;
3923 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3924
3925 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3926 mad = &evt->iu.discover_targets;
3927 memset(mad, 0, sizeof(*mad));
3928 mad->common.version = 1;
3929 mad->common.opcode = IBMVFC_DISC_TARGETS;
3930 mad->common.length = sizeof(*mad);
3931 mad->bufflen = vhost->disc_buf_sz;
3932 mad->buffer.va = vhost->disc_buf_dma;
3933 mad->buffer.len = vhost->disc_buf_sz;
3934 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3935
3936 if (!ibmvfc_send_event(evt, vhost, default_timeout))
3937 ibmvfc_dbg(vhost, "Sent discover targets\n");
3938 else
3939 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3940 }
3941
3942 /**
3943 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3944 * @evt: ibmvfc event struct
3945 *
3946 **/
3947 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3948 {
3949 struct ibmvfc_host *vhost = evt->vhost;
3950 u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3951 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3952 unsigned int npiv_max_sectors;
3953 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3954
3955 switch (mad_status) {
3956 case IBMVFC_MAD_SUCCESS:
3957 ibmvfc_free_event(evt);
3958 break;
3959 case IBMVFC_MAD_FAILED:
3960 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3961 level += ibmvfc_retry_host_init(vhost);
3962 else
3963 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3964 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
3965 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3966 ibmvfc_free_event(evt);
3967 return;
3968 case IBMVFC_MAD_CRQ_ERROR:
3969 ibmvfc_retry_host_init(vhost);
3970 case IBMVFC_MAD_DRIVER_FAILED:
3971 ibmvfc_free_event(evt);
3972 return;
3973 default:
3974 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3975 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3976 ibmvfc_free_event(evt);
3977 return;
3978 }
3979
3980 vhost->client_migrated = 0;
3981
3982 if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
3983 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
3984 rsp->flags);
3985 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3986 wake_up(&vhost->work_wait_q);
3987 return;
3988 }
3989
3990 if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
3991 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
3992 rsp->max_cmds);
3993 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3994 wake_up(&vhost->work_wait_q);
3995 return;
3996 }
3997
3998 vhost->logged_in = 1;
3999 npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
4000 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4001 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4002 rsp->drc_name, npiv_max_sectors);
4003
4004 fc_host_fabric_name(vhost->host) = rsp->node_name;
4005 fc_host_node_name(vhost->host) = rsp->node_name;
4006 fc_host_port_name(vhost->host) = rsp->port_name;
4007 fc_host_port_id(vhost->host) = rsp->scsi_id;
4008 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4009 fc_host_supported_classes(vhost->host) = 0;
4010 if (rsp->service_parms.class1_parms[0] & 0x80000000)
4011 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4012 if (rsp->service_parms.class2_parms[0] & 0x80000000)
4013 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4014 if (rsp->service_parms.class3_parms[0] & 0x80000000)
4015 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4016 fc_host_maxframe_size(vhost->host) =
4017 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
4018
4019 vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
4020 vhost->host->max_sectors = npiv_max_sectors;
4021 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4022 wake_up(&vhost->work_wait_q);
4023 }
4024
4025 /**
4026 * ibmvfc_npiv_login - Sends NPIV login
4027 * @vhost: ibmvfc host struct
4028 *
4029 **/
4030 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4031 {
4032 struct ibmvfc_npiv_login_mad *mad;
4033 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4034
4035 ibmvfc_gather_partition_info(vhost);
4036 ibmvfc_set_login_info(vhost);
4037 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4038
4039 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4040 mad = &evt->iu.npiv_login;
4041 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4042 mad->common.version = 1;
4043 mad->common.opcode = IBMVFC_NPIV_LOGIN;
4044 mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
4045 mad->buffer.va = vhost->login_buf_dma;
4046 mad->buffer.len = sizeof(*vhost->login_buf);
4047
4048 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4049
4050 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4051 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4052 else
4053 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4054 };
4055
4056 /**
4057 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4058 * @vhost: ibmvfc host struct
4059 *
4060 **/
4061 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4062 {
4063 struct ibmvfc_host *vhost = evt->vhost;
4064 u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
4065
4066 ibmvfc_free_event(evt);
4067
4068 switch (mad_status) {
4069 case IBMVFC_MAD_SUCCESS:
4070 if (list_empty(&vhost->sent) &&
4071 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4072 ibmvfc_init_host(vhost);
4073 return;
4074 }
4075 break;
4076 case IBMVFC_MAD_FAILED:
4077 case IBMVFC_MAD_NOT_SUPPORTED:
4078 case IBMVFC_MAD_CRQ_ERROR:
4079 case IBMVFC_MAD_DRIVER_FAILED:
4080 default:
4081 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4082 break;
4083 }
4084
4085 ibmvfc_hard_reset_host(vhost);
4086 }
4087
4088 /**
4089 * ibmvfc_npiv_logout - Issue an NPIV Logout
4090 * @vhost: ibmvfc host struct
4091 *
4092 **/
4093 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4094 {
4095 struct ibmvfc_npiv_logout_mad *mad;
4096 struct ibmvfc_event *evt;
4097
4098 evt = ibmvfc_get_event(vhost);
4099 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4100
4101 mad = &evt->iu.npiv_logout;
4102 memset(mad, 0, sizeof(*mad));
4103 mad->common.version = 1;
4104 mad->common.opcode = IBMVFC_NPIV_LOGOUT;
4105 mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
4106
4107 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4108
4109 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4110 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4111 else
4112 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4113 }
4114
4115 /**
4116 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4117 * @vhost: ibmvfc host struct
4118 *
4119 * Returns:
4120 * 1 if work to do / 0 if not
4121 **/
4122 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4123 {
4124 struct ibmvfc_target *tgt;
4125
4126 list_for_each_entry(tgt, &vhost->targets, queue) {
4127 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4128 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4129 return 1;
4130 }
4131
4132 return 0;
4133 }
4134
4135 /**
4136 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4137 * @vhost: ibmvfc host struct
4138 *
4139 * Returns:
4140 * 1 if work to do / 0 if not
4141 **/
4142 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4143 {
4144 struct ibmvfc_target *tgt;
4145
4146 if (kthread_should_stop())
4147 return 1;
4148 switch (vhost->action) {
4149 case IBMVFC_HOST_ACTION_NONE:
4150 case IBMVFC_HOST_ACTION_INIT_WAIT:
4151 case IBMVFC_HOST_ACTION_LOGO_WAIT:
4152 return 0;
4153 case IBMVFC_HOST_ACTION_TGT_INIT:
4154 case IBMVFC_HOST_ACTION_QUERY_TGTS:
4155 if (vhost->discovery_threads == disc_threads)
4156 return 0;
4157 list_for_each_entry(tgt, &vhost->targets, queue)
4158 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4159 return 1;
4160 list_for_each_entry(tgt, &vhost->targets, queue)
4161 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4162 return 0;
4163 return 1;
4164 case IBMVFC_HOST_ACTION_LOGO:
4165 case IBMVFC_HOST_ACTION_INIT:
4166 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4167 case IBMVFC_HOST_ACTION_TGT_DEL:
4168 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4169 case IBMVFC_HOST_ACTION_QUERY:
4170 case IBMVFC_HOST_ACTION_RESET:
4171 case IBMVFC_HOST_ACTION_REENABLE:
4172 default:
4173 break;
4174 };
4175
4176 return 1;
4177 }
4178
4179 /**
4180 * ibmvfc_work_to_do - Is there task level work to do?
4181 * @vhost: ibmvfc host struct
4182 *
4183 * Returns:
4184 * 1 if work to do / 0 if not
4185 **/
4186 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4187 {
4188 unsigned long flags;
4189 int rc;
4190
4191 spin_lock_irqsave(vhost->host->host_lock, flags);
4192 rc = __ibmvfc_work_to_do(vhost);
4193 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4194 return rc;
4195 }
4196
4197 /**
4198 * ibmvfc_log_ae - Log async events if necessary
4199 * @vhost: ibmvfc host struct
4200 * @events: events to log
4201 *
4202 **/
4203 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4204 {
4205 if (events & IBMVFC_AE_RSCN)
4206 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4207 if ((events & IBMVFC_AE_LINKDOWN) &&
4208 vhost->state >= IBMVFC_HALTED)
4209 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4210 if ((events & IBMVFC_AE_LINKUP) &&
4211 vhost->state == IBMVFC_INITIALIZING)
4212 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4213 }
4214
4215 /**
4216 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4217 * @tgt: ibmvfc target struct
4218 *
4219 **/
4220 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4221 {
4222 struct ibmvfc_host *vhost = tgt->vhost;
4223 struct fc_rport *rport;
4224 unsigned long flags;
4225
4226 tgt_dbg(tgt, "Adding rport\n");
4227 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4228 spin_lock_irqsave(vhost->host->host_lock, flags);
4229
4230 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4231 tgt_dbg(tgt, "Deleting rport\n");
4232 list_del(&tgt->queue);
4233 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4234 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4235 fc_remote_port_delete(rport);
4236 del_timer_sync(&tgt->timer);
4237 kref_put(&tgt->kref, ibmvfc_release_tgt);
4238 return;
4239 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4240 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4241 return;
4242 }
4243
4244 if (rport) {
4245 tgt_dbg(tgt, "rport add succeeded\n");
4246 tgt->rport = rport;
4247 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
4248 rport->supported_classes = 0;
4249 tgt->target_id = rport->scsi_target_id;
4250 if (tgt->service_parms.class1_parms[0] & 0x80000000)
4251 rport->supported_classes |= FC_COS_CLASS1;
4252 if (tgt->service_parms.class2_parms[0] & 0x80000000)
4253 rport->supported_classes |= FC_COS_CLASS2;
4254 if (tgt->service_parms.class3_parms[0] & 0x80000000)
4255 rport->supported_classes |= FC_COS_CLASS3;
4256 if (rport->rqst_q)
4257 blk_queue_max_segments(rport->rqst_q, 1);
4258 } else
4259 tgt_dbg(tgt, "rport add failed\n");
4260 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4261 }
4262
4263 /**
4264 * ibmvfc_do_work - Do task level work
4265 * @vhost: ibmvfc host struct
4266 *
4267 **/
4268 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4269 {
4270 struct ibmvfc_target *tgt;
4271 unsigned long flags;
4272 struct fc_rport *rport;
4273 int rc;
4274
4275 ibmvfc_log_ae(vhost, vhost->events_to_log);
4276 spin_lock_irqsave(vhost->host->host_lock, flags);
4277 vhost->events_to_log = 0;
4278 switch (vhost->action) {
4279 case IBMVFC_HOST_ACTION_NONE:
4280 case IBMVFC_HOST_ACTION_LOGO_WAIT:
4281 case IBMVFC_HOST_ACTION_INIT_WAIT:
4282 break;
4283 case IBMVFC_HOST_ACTION_RESET:
4284 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4285 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4286 rc = ibmvfc_reset_crq(vhost);
4287 spin_lock_irqsave(vhost->host->host_lock, flags);
4288 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4289 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4290 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4291 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4292 }
4293 break;
4294 case IBMVFC_HOST_ACTION_REENABLE:
4295 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4296 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4297 rc = ibmvfc_reenable_crq_queue(vhost);
4298 spin_lock_irqsave(vhost->host->host_lock, flags);
4299 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4300 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4301 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4302 }
4303 break;
4304 case IBMVFC_HOST_ACTION_LOGO:
4305 vhost->job_step(vhost);
4306 break;
4307 case IBMVFC_HOST_ACTION_INIT:
4308 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4309 if (vhost->delay_init) {
4310 vhost->delay_init = 0;
4311 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4312 ssleep(15);
4313 return;
4314 } else
4315 vhost->job_step(vhost);
4316 break;
4317 case IBMVFC_HOST_ACTION_QUERY:
4318 list_for_each_entry(tgt, &vhost->targets, queue)
4319 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4320 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4321 break;
4322 case IBMVFC_HOST_ACTION_QUERY_TGTS:
4323 list_for_each_entry(tgt, &vhost->targets, queue) {
4324 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4325 tgt->job_step(tgt);
4326 break;
4327 }
4328 }
4329
4330 if (!ibmvfc_dev_init_to_do(vhost))
4331 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4332 break;
4333 case IBMVFC_HOST_ACTION_TGT_DEL:
4334 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4335 list_for_each_entry(tgt, &vhost->targets, queue) {
4336 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4337 tgt_dbg(tgt, "Deleting rport\n");
4338 rport = tgt->rport;
4339 tgt->rport = NULL;
4340 list_del(&tgt->queue);
4341 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4342 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4343 if (rport)
4344 fc_remote_port_delete(rport);
4345 del_timer_sync(&tgt->timer);
4346 kref_put(&tgt->kref, ibmvfc_release_tgt);
4347 return;
4348 }
4349 }
4350
4351 if (vhost->state == IBMVFC_INITIALIZING) {
4352 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4353 if (vhost->reinit) {
4354 vhost->reinit = 0;
4355 scsi_block_requests(vhost->host);
4356 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4357 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4358 } else {
4359 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4360 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4361 wake_up(&vhost->init_wait_q);
4362 schedule_work(&vhost->rport_add_work_q);
4363 vhost->init_retries = 0;
4364 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4365 scsi_unblock_requests(vhost->host);
4366 }
4367
4368 return;
4369 } else {
4370 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4371 vhost->job_step = ibmvfc_discover_targets;
4372 }
4373 } else {
4374 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4375 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4376 scsi_unblock_requests(vhost->host);
4377 wake_up(&vhost->init_wait_q);
4378 return;
4379 }
4380 break;
4381 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4382 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4383 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4384 ibmvfc_alloc_targets(vhost);
4385 spin_lock_irqsave(vhost->host->host_lock, flags);
4386 break;
4387 case IBMVFC_HOST_ACTION_TGT_INIT:
4388 list_for_each_entry(tgt, &vhost->targets, queue) {
4389 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4390 tgt->job_step(tgt);
4391 break;
4392 }
4393 }
4394
4395 if (!ibmvfc_dev_init_to_do(vhost))
4396 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4397 break;
4398 default:
4399 break;
4400 };
4401
4402 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4403 }
4404
4405 /**
4406 * ibmvfc_work - Do task level work
4407 * @data: ibmvfc host struct
4408 *
4409 * Returns:
4410 * zero
4411 **/
4412 static int ibmvfc_work(void *data)
4413 {
4414 struct ibmvfc_host *vhost = data;
4415 int rc;
4416
4417 set_user_nice(current, -20);
4418
4419 while (1) {
4420 rc = wait_event_interruptible(vhost->work_wait_q,
4421 ibmvfc_work_to_do(vhost));
4422
4423 BUG_ON(rc);
4424
4425 if (kthread_should_stop())
4426 break;
4427
4428 ibmvfc_do_work(vhost);
4429 }
4430
4431 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4432 return 0;
4433 }
4434
4435 /**
4436 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4437 * @vhost: ibmvfc host struct
4438 *
4439 * Allocates a page for messages, maps it for dma, and registers
4440 * the crq with the hypervisor.
4441 *
4442 * Return value:
4443 * zero on success / other on failure
4444 **/
4445 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4446 {
4447 int rc, retrc = -ENOMEM;
4448 struct device *dev = vhost->dev;
4449 struct vio_dev *vdev = to_vio_dev(dev);
4450 struct ibmvfc_crq_queue *crq = &vhost->crq;
4451
4452 ENTER;
4453 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4454
4455 if (!crq->msgs)
4456 return -ENOMEM;
4457
4458 crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4459 crq->msg_token = dma_map_single(dev, crq->msgs,
4460 PAGE_SIZE, DMA_BIDIRECTIONAL);
4461
4462 if (dma_mapping_error(dev, crq->msg_token))
4463 goto map_failed;
4464
4465 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4466 crq->msg_token, PAGE_SIZE);
4467
4468 if (rc == H_RESOURCE)
4469 /* maybe kexecing and resource is busy. try a reset */
4470 retrc = rc = ibmvfc_reset_crq(vhost);
4471
4472 if (rc == H_CLOSED)
4473 dev_warn(dev, "Partner adapter not ready\n");
4474 else if (rc) {
4475 dev_warn(dev, "Error %d opening adapter\n", rc);
4476 goto reg_crq_failed;
4477 }
4478
4479 retrc = 0;
4480
4481 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4482
4483 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4484 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4485 goto req_irq_failed;
4486 }
4487
4488 if ((rc = vio_enable_interrupts(vdev))) {
4489 dev_err(dev, "Error %d enabling interrupts\n", rc);
4490 goto req_irq_failed;
4491 }
4492
4493 crq->cur = 0;
4494 LEAVE;
4495 return retrc;
4496
4497 req_irq_failed:
4498 tasklet_kill(&vhost->tasklet);
4499 do {
4500 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4501 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4502 reg_crq_failed:
4503 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4504 map_failed:
4505 free_page((unsigned long)crq->msgs);
4506 return retrc;
4507 }
4508
4509 /**
4510 * ibmvfc_free_mem - Free memory for vhost
4511 * @vhost: ibmvfc host struct
4512 *
4513 * Return value:
4514 * none
4515 **/
4516 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4517 {
4518 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4519
4520 ENTER;
4521 mempool_destroy(vhost->tgt_pool);
4522 kfree(vhost->trace);
4523 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4524 vhost->disc_buf_dma);
4525 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4526 vhost->login_buf, vhost->login_buf_dma);
4527 dma_pool_destroy(vhost->sg_pool);
4528 dma_unmap_single(vhost->dev, async_q->msg_token,
4529 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4530 free_page((unsigned long)async_q->msgs);
4531 LEAVE;
4532 }
4533
4534 /**
4535 * ibmvfc_alloc_mem - Allocate memory for vhost
4536 * @vhost: ibmvfc host struct
4537 *
4538 * Return value:
4539 * 0 on success / non-zero on failure
4540 **/
4541 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4542 {
4543 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4544 struct device *dev = vhost->dev;
4545
4546 ENTER;
4547 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4548 if (!async_q->msgs) {
4549 dev_err(dev, "Couldn't allocate async queue.\n");
4550 goto nomem;
4551 }
4552
4553 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4554 async_q->msg_token = dma_map_single(dev, async_q->msgs,
4555 async_q->size * sizeof(*async_q->msgs),
4556 DMA_BIDIRECTIONAL);
4557
4558 if (dma_mapping_error(dev, async_q->msg_token)) {
4559 dev_err(dev, "Failed to map async queue\n");
4560 goto free_async_crq;
4561 }
4562
4563 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4564 SG_ALL * sizeof(struct srp_direct_buf),
4565 sizeof(struct srp_direct_buf), 0);
4566
4567 if (!vhost->sg_pool) {
4568 dev_err(dev, "Failed to allocate sg pool\n");
4569 goto unmap_async_crq;
4570 }
4571
4572 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4573 &vhost->login_buf_dma, GFP_KERNEL);
4574
4575 if (!vhost->login_buf) {
4576 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4577 goto free_sg_pool;
4578 }
4579
4580 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4581 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4582 &vhost->disc_buf_dma, GFP_KERNEL);
4583
4584 if (!vhost->disc_buf) {
4585 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4586 goto free_login_buffer;
4587 }
4588
4589 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4590 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4591
4592 if (!vhost->trace)
4593 goto free_disc_buffer;
4594
4595 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4596 sizeof(struct ibmvfc_target));
4597
4598 if (!vhost->tgt_pool) {
4599 dev_err(dev, "Couldn't allocate target memory pool\n");
4600 goto free_trace;
4601 }
4602
4603 LEAVE;
4604 return 0;
4605
4606 free_trace:
4607 kfree(vhost->trace);
4608 free_disc_buffer:
4609 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4610 vhost->disc_buf_dma);
4611 free_login_buffer:
4612 dma_free_coherent(dev, sizeof(*vhost->login_buf),
4613 vhost->login_buf, vhost->login_buf_dma);
4614 free_sg_pool:
4615 dma_pool_destroy(vhost->sg_pool);
4616 unmap_async_crq:
4617 dma_unmap_single(dev, async_q->msg_token,
4618 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4619 free_async_crq:
4620 free_page((unsigned long)async_q->msgs);
4621 nomem:
4622 LEAVE;
4623 return -ENOMEM;
4624 }
4625
4626 /**
4627 * ibmvfc_rport_add_thread - Worker thread for rport adds
4628 * @work: work struct
4629 *
4630 **/
4631 static void ibmvfc_rport_add_thread(struct work_struct *work)
4632 {
4633 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4634 rport_add_work_q);
4635 struct ibmvfc_target *tgt;
4636 struct fc_rport *rport;
4637 unsigned long flags;
4638 int did_work;
4639
4640 ENTER;
4641 spin_lock_irqsave(vhost->host->host_lock, flags);
4642 do {
4643 did_work = 0;
4644 if (vhost->state != IBMVFC_ACTIVE)
4645 break;
4646
4647 list_for_each_entry(tgt, &vhost->targets, queue) {
4648 if (tgt->add_rport) {
4649 did_work = 1;
4650 tgt->add_rport = 0;
4651 kref_get(&tgt->kref);
4652 rport = tgt->rport;
4653 if (!rport) {
4654 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4655 ibmvfc_tgt_add_rport(tgt);
4656 } else if (get_device(&rport->dev)) {
4657 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4658 tgt_dbg(tgt, "Setting rport roles\n");
4659 fc_remote_port_rolechg(rport, tgt->ids.roles);
4660 put_device(&rport->dev);
4661 }
4662
4663 kref_put(&tgt->kref, ibmvfc_release_tgt);
4664 spin_lock_irqsave(vhost->host->host_lock, flags);
4665 break;
4666 }
4667 }
4668 } while(did_work);
4669
4670 if (vhost->state == IBMVFC_ACTIVE)
4671 vhost->scan_complete = 1;
4672 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4673 LEAVE;
4674 }
4675
4676 /**
4677 * ibmvfc_probe - Adapter hot plug add entry point
4678 * @vdev: vio device struct
4679 * @id: vio device id struct
4680 *
4681 * Return value:
4682 * 0 on success / non-zero on failure
4683 **/
4684 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4685 {
4686 struct ibmvfc_host *vhost;
4687 struct Scsi_Host *shost;
4688 struct device *dev = &vdev->dev;
4689 int rc = -ENOMEM;
4690
4691 ENTER;
4692 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4693 if (!shost) {
4694 dev_err(dev, "Couldn't allocate host data\n");
4695 goto out;
4696 }
4697
4698 shost->transportt = ibmvfc_transport_template;
4699 shost->can_queue = max_requests;
4700 shost->max_lun = max_lun;
4701 shost->max_id = max_targets;
4702 shost->max_sectors = IBMVFC_MAX_SECTORS;
4703 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4704 shost->unique_id = shost->host_no;
4705
4706 vhost = shost_priv(shost);
4707 INIT_LIST_HEAD(&vhost->sent);
4708 INIT_LIST_HEAD(&vhost->free);
4709 INIT_LIST_HEAD(&vhost->targets);
4710 sprintf(vhost->name, IBMVFC_NAME);
4711 vhost->host = shost;
4712 vhost->dev = dev;
4713 vhost->partition_number = -1;
4714 vhost->log_level = log_level;
4715 vhost->task_set = 1;
4716 strcpy(vhost->partition_name, "UNKNOWN");
4717 init_waitqueue_head(&vhost->work_wait_q);
4718 init_waitqueue_head(&vhost->init_wait_q);
4719 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4720 mutex_init(&vhost->passthru_mutex);
4721
4722 if ((rc = ibmvfc_alloc_mem(vhost)))
4723 goto free_scsi_host;
4724
4725 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4726 shost->host_no);
4727
4728 if (IS_ERR(vhost->work_thread)) {
4729 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4730 PTR_ERR(vhost->work_thread));
4731 goto free_host_mem;
4732 }
4733
4734 if ((rc = ibmvfc_init_crq(vhost))) {
4735 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4736 goto kill_kthread;
4737 }
4738
4739 if ((rc = ibmvfc_init_event_pool(vhost))) {
4740 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4741 goto release_crq;
4742 }
4743
4744 if ((rc = scsi_add_host(shost, dev)))
4745 goto release_event_pool;
4746
4747 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4748 &ibmvfc_trace_attr))) {
4749 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4750 goto remove_shost;
4751 }
4752
4753 if (shost_to_fc_host(shost)->rqst_q)
4754 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4755 dev_set_drvdata(dev, vhost);
4756 spin_lock(&ibmvfc_driver_lock);
4757 list_add_tail(&vhost->queue, &ibmvfc_head);
4758 spin_unlock(&ibmvfc_driver_lock);
4759
4760 ibmvfc_send_crq_init(vhost);
4761 scsi_scan_host(shost);
4762 return 0;
4763
4764 remove_shost:
4765 scsi_remove_host(shost);
4766 release_event_pool:
4767 ibmvfc_free_event_pool(vhost);
4768 release_crq:
4769 ibmvfc_release_crq_queue(vhost);
4770 kill_kthread:
4771 kthread_stop(vhost->work_thread);
4772 free_host_mem:
4773 ibmvfc_free_mem(vhost);
4774 free_scsi_host:
4775 scsi_host_put(shost);
4776 out:
4777 LEAVE;
4778 return rc;
4779 }
4780
4781 /**
4782 * ibmvfc_remove - Adapter hot plug remove entry point
4783 * @vdev: vio device struct
4784 *
4785 * Return value:
4786 * 0
4787 **/
4788 static int ibmvfc_remove(struct vio_dev *vdev)
4789 {
4790 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4791 unsigned long flags;
4792
4793 ENTER;
4794 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4795
4796 spin_lock_irqsave(vhost->host->host_lock, flags);
4797 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4798 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4799
4800 ibmvfc_wait_while_resetting(vhost);
4801 ibmvfc_release_crq_queue(vhost);
4802 kthread_stop(vhost->work_thread);
4803 fc_remove_host(vhost->host);
4804 scsi_remove_host(vhost->host);
4805
4806 spin_lock_irqsave(vhost->host->host_lock, flags);
4807 ibmvfc_purge_requests(vhost, DID_ERROR);
4808 ibmvfc_free_event_pool(vhost);
4809 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4810
4811 ibmvfc_free_mem(vhost);
4812 spin_lock(&ibmvfc_driver_lock);
4813 list_del(&vhost->queue);
4814 spin_unlock(&ibmvfc_driver_lock);
4815 scsi_host_put(vhost->host);
4816 LEAVE;
4817 return 0;
4818 }
4819
4820 /**
4821 * ibmvfc_resume - Resume from suspend
4822 * @dev: device struct
4823 *
4824 * We may have lost an interrupt across suspend/resume, so kick the
4825 * interrupt handler
4826 *
4827 */
4828 static int ibmvfc_resume(struct device *dev)
4829 {
4830 unsigned long flags;
4831 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4832 struct vio_dev *vdev = to_vio_dev(dev);
4833
4834 spin_lock_irqsave(vhost->host->host_lock, flags);
4835 vio_disable_interrupts(vdev);
4836 tasklet_schedule(&vhost->tasklet);
4837 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4838 return 0;
4839 }
4840
4841 /**
4842 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4843 * @vdev: vio device struct
4844 *
4845 * Return value:
4846 * Number of bytes the driver will need to DMA map at the same time in
4847 * order to perform well.
4848 */
4849 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4850 {
4851 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4852 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4853 }
4854
4855 static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
4856 {"fcp", "IBM,vfc-client"},
4857 { "", "" }
4858 };
4859 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4860
4861 static struct dev_pm_ops ibmvfc_pm_ops = {
4862 .resume = ibmvfc_resume
4863 };
4864
4865 static struct vio_driver ibmvfc_driver = {
4866 .id_table = ibmvfc_device_table,
4867 .probe = ibmvfc_probe,
4868 .remove = ibmvfc_remove,
4869 .get_desired_dma = ibmvfc_get_desired_dma,
4870 .driver = {
4871 .name = IBMVFC_NAME,
4872 .owner = THIS_MODULE,
4873 .pm = &ibmvfc_pm_ops,
4874 }
4875 };
4876
4877 static struct fc_function_template ibmvfc_transport_functions = {
4878 .show_host_fabric_name = 1,
4879 .show_host_node_name = 1,
4880 .show_host_port_name = 1,
4881 .show_host_supported_classes = 1,
4882 .show_host_port_type = 1,
4883 .show_host_port_id = 1,
4884 .show_host_maxframe_size = 1,
4885
4886 .get_host_port_state = ibmvfc_get_host_port_state,
4887 .show_host_port_state = 1,
4888
4889 .get_host_speed = ibmvfc_get_host_speed,
4890 .show_host_speed = 1,
4891
4892 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4893 .terminate_rport_io = ibmvfc_terminate_rport_io,
4894
4895 .show_rport_maxframe_size = 1,
4896 .show_rport_supported_classes = 1,
4897
4898 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4899 .show_rport_dev_loss_tmo = 1,
4900
4901 .get_starget_node_name = ibmvfc_get_starget_node_name,
4902 .show_starget_node_name = 1,
4903
4904 .get_starget_port_name = ibmvfc_get_starget_port_name,
4905 .show_starget_port_name = 1,
4906
4907 .get_starget_port_id = ibmvfc_get_starget_port_id,
4908 .show_starget_port_id = 1,
4909
4910 .bsg_request = ibmvfc_bsg_request,
4911 .bsg_timeout = ibmvfc_bsg_timeout,
4912 };
4913
4914 /**
4915 * ibmvfc_module_init - Initialize the ibmvfc module
4916 *
4917 * Return value:
4918 * 0 on success / other on failure
4919 **/
4920 static int __init ibmvfc_module_init(void)
4921 {
4922 int rc;
4923
4924 if (!firmware_has_feature(FW_FEATURE_VIO))
4925 return -ENODEV;
4926
4927 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4928 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4929
4930 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4931 if (!ibmvfc_transport_template)
4932 return -ENOMEM;
4933
4934 rc = vio_register_driver(&ibmvfc_driver);
4935 if (rc)
4936 fc_release_transport(ibmvfc_transport_template);
4937 return rc;
4938 }
4939
4940 /**
4941 * ibmvfc_module_exit - Teardown the ibmvfc module
4942 *
4943 * Return value:
4944 * nothing
4945 **/
4946 static void __exit ibmvfc_module_exit(void)
4947 {
4948 vio_unregister_driver(&ibmvfc_driver);
4949 fc_release_transport(ibmvfc_transport_template);
4950 }
4951
4952 module_init(ibmvfc_module_init);
4953 module_exit(ibmvfc_module_exit);
Tomato firmware and modifications.