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 <linux/bsg-lib.h>
36 #include <asm/firmware.h>
37 #include <asm/irq.h>
38 #include <asm/vio.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_cmnd.h>
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi_device.h>
43 #include <scsi/scsi_tcq.h>
44 #include <scsi/scsi_transport_fc.h>
45 #include <scsi/scsi_bsg_fc.h>
46 #include "ibmvfc.h"
47
48 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
49 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
50 static u64 max_lun = IBMVFC_MAX_LUN;
51 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
52 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
53 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
54 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
55 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
56 static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
57 static LIST_HEAD(ibmvfc_head);
58 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
59 static struct scsi_transport_template *ibmvfc_transport_template;
60
61 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
62 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
63 MODULE_LICENSE("GPL");
64 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
65
66 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
67 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
68 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
69 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
70 MODULE_PARM_DESC(default_timeout,
71 "Default timeout in seconds for initialization and EH commands. "
72 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
73 module_param_named(max_requests, max_requests, uint, S_IRUGO);
74 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
75 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
76 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
77 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
78 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
79 module_param_named(max_targets, max_targets, uint, S_IRUGO);
80 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
81 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
82 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
83 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
84 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
85 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
86 MODULE_PARM_DESC(debug, "Enable driver debug information. "
87 "[Default=" __stringify(IBMVFC_DEBUG) "]");
88 module_param_named(log_level, log_level, uint, 0);
89 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
90 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
91 module_param_named(cls3_error, cls3_error, uint, 0);
92 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
93 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
94
95 static const struct {
96 u16 status;
97 u16 error;
98 u8 result;
99 u8 retry;
100 int log;
101 char *name;
102 } cmd_status [] = {
103 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
104 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
105 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
106 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
107 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
108 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
109 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
110 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
111 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
112 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
113 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
114 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
115 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
116 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
117
118 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
119 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
120 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
121 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
122 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
123 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
124 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
125 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
126 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
127 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
128
129 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
130 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
131 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
132 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
133 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
134 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
135 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
136 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
137 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
138 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
139 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
140
141 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
142 };
143
144 static void ibmvfc_npiv_login(struct ibmvfc_host *);
145 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
146 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
147 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
148 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
149
150 static const char *unknown_error = "unknown error";
151
152 #ifdef CONFIG_SCSI_IBMVFC_TRACE
153 /**
154 * ibmvfc_trc_start - Log a start trace entry
155 * @evt: ibmvfc event struct
156 *
157 **/
ibmvfc_trc_start(struct ibmvfc_event * evt)158 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
159 {
160 struct ibmvfc_host *vhost = evt->vhost;
161 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
162 struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
163 struct ibmvfc_trace_entry *entry;
164
165 entry = &vhost->trace[vhost->trace_index++];
166 entry->evt = evt;
167 entry->time = jiffies;
168 entry->fmt = evt->crq.format;
169 entry->type = IBMVFC_TRC_START;
170
171 switch (entry->fmt) {
172 case IBMVFC_CMD_FORMAT:
173 entry->op_code = vfc_cmd->iu.cdb[0];
174 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
175 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
176 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
177 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
178 break;
179 case IBMVFC_MAD_FORMAT:
180 entry->op_code = be32_to_cpu(mad->opcode);
181 break;
182 default:
183 break;
184 }
185 }
186
187 /**
188 * ibmvfc_trc_end - Log an end trace entry
189 * @evt: ibmvfc event struct
190 *
191 **/
ibmvfc_trc_end(struct ibmvfc_event * evt)192 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
193 {
194 struct ibmvfc_host *vhost = evt->vhost;
195 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
196 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
197 struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
198
199 entry->evt = evt;
200 entry->time = jiffies;
201 entry->fmt = evt->crq.format;
202 entry->type = IBMVFC_TRC_END;
203
204 switch (entry->fmt) {
205 case IBMVFC_CMD_FORMAT:
206 entry->op_code = vfc_cmd->iu.cdb[0];
207 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
208 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
209 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
210 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
211 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
212 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
213 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
214 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
215 break;
216 case IBMVFC_MAD_FORMAT:
217 entry->op_code = be32_to_cpu(mad->opcode);
218 entry->u.end.status = be16_to_cpu(mad->status);
219 break;
220 default:
221 break;
222
223 }
224 }
225
226 #else
227 #define ibmvfc_trc_start(evt) do { } while (0)
228 #define ibmvfc_trc_end(evt) do { } while (0)
229 #endif
230
231 /**
232 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
233 * @status: status / error class
234 * @error: error
235 *
236 * Return value:
237 * index into cmd_status / -EINVAL on failure
238 **/
ibmvfc_get_err_index(u16 status,u16 error)239 static int ibmvfc_get_err_index(u16 status, u16 error)
240 {
241 int i;
242
243 for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
244 if ((cmd_status[i].status & status) == cmd_status[i].status &&
245 cmd_status[i].error == error)
246 return i;
247
248 return -EINVAL;
249 }
250
251 /**
252 * ibmvfc_get_cmd_error - Find the error description for the fcp response
253 * @status: status / error class
254 * @error: error
255 *
256 * Return value:
257 * error description string
258 **/
ibmvfc_get_cmd_error(u16 status,u16 error)259 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
260 {
261 int rc = ibmvfc_get_err_index(status, error);
262 if (rc >= 0)
263 return cmd_status[rc].name;
264 return unknown_error;
265 }
266
267 /**
268 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
269 * @vfc_cmd: ibmvfc command struct
270 *
271 * Return value:
272 * SCSI result value to return for completed command
273 **/
ibmvfc_get_err_result(struct ibmvfc_cmd * vfc_cmd)274 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
275 {
276 int err;
277 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
278 int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
279
280 if ((rsp->flags & FCP_RSP_LEN_VALID) &&
281 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
282 rsp->data.info.rsp_code))
283 return DID_ERROR << 16;
284
285 err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
286 if (err >= 0)
287 return rsp->scsi_status | (cmd_status[err].result << 16);
288 return rsp->scsi_status | (DID_ERROR << 16);
289 }
290
291 /**
292 * ibmvfc_retry_cmd - Determine if error status is retryable
293 * @status: status / error class
294 * @error: error
295 *
296 * Return value:
297 * 1 if error should be retried / 0 if it should not
298 **/
ibmvfc_retry_cmd(u16 status,u16 error)299 static int ibmvfc_retry_cmd(u16 status, u16 error)
300 {
301 int rc = ibmvfc_get_err_index(status, error);
302
303 if (rc >= 0)
304 return cmd_status[rc].retry;
305 return 1;
306 }
307
308 static const char *unknown_fc_explain = "unknown fc explain";
309
310 static const struct {
311 u16 fc_explain;
312 char *name;
313 } ls_explain [] = {
314 { 0x00, "no additional explanation" },
315 { 0x01, "service parameter error - options" },
316 { 0x03, "service parameter error - initiator control" },
317 { 0x05, "service parameter error - recipient control" },
318 { 0x07, "service parameter error - received data field size" },
319 { 0x09, "service parameter error - concurrent seq" },
320 { 0x0B, "service parameter error - credit" },
321 { 0x0D, "invalid N_Port/F_Port_Name" },
322 { 0x0E, "invalid node/Fabric Name" },
323 { 0x0F, "invalid common service parameters" },
324 { 0x11, "invalid association header" },
325 { 0x13, "association header required" },
326 { 0x15, "invalid originator S_ID" },
327 { 0x17, "invalid OX_ID-RX-ID combination" },
328 { 0x19, "command (request) already in progress" },
329 { 0x1E, "N_Port Login requested" },
330 { 0x1F, "Invalid N_Port_ID" },
331 };
332
333 static const struct {
334 u16 fc_explain;
335 char *name;
336 } gs_explain [] = {
337 { 0x00, "no additional explanation" },
338 { 0x01, "port identifier not registered" },
339 { 0x02, "port name not registered" },
340 { 0x03, "node name not registered" },
341 { 0x04, "class of service not registered" },
342 { 0x06, "initial process associator not registered" },
343 { 0x07, "FC-4 TYPEs not registered" },
344 { 0x08, "symbolic port name not registered" },
345 { 0x09, "symbolic node name not registered" },
346 { 0x0A, "port type not registered" },
347 { 0xF0, "authorization exception" },
348 { 0xF1, "authentication exception" },
349 { 0xF2, "data base full" },
350 { 0xF3, "data base empty" },
351 { 0xF4, "processing request" },
352 { 0xF5, "unable to verify connection" },
353 { 0xF6, "devices not in a common zone" },
354 };
355
356 /**
357 * ibmvfc_get_ls_explain - Return the FC Explain description text
358 * @status: FC Explain status
359 *
360 * Returns:
361 * error string
362 **/
ibmvfc_get_ls_explain(u16 status)363 static const char *ibmvfc_get_ls_explain(u16 status)
364 {
365 int i;
366
367 for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
368 if (ls_explain[i].fc_explain == status)
369 return ls_explain[i].name;
370
371 return unknown_fc_explain;
372 }
373
374 /**
375 * ibmvfc_get_gs_explain - Return the FC Explain description text
376 * @status: FC Explain status
377 *
378 * Returns:
379 * error string
380 **/
ibmvfc_get_gs_explain(u16 status)381 static const char *ibmvfc_get_gs_explain(u16 status)
382 {
383 int i;
384
385 for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
386 if (gs_explain[i].fc_explain == status)
387 return gs_explain[i].name;
388
389 return unknown_fc_explain;
390 }
391
392 static const struct {
393 enum ibmvfc_fc_type fc_type;
394 char *name;
395 } fc_type [] = {
396 { IBMVFC_FABRIC_REJECT, "fabric reject" },
397 { IBMVFC_PORT_REJECT, "port reject" },
398 { IBMVFC_LS_REJECT, "ELS reject" },
399 { IBMVFC_FABRIC_BUSY, "fabric busy" },
400 { IBMVFC_PORT_BUSY, "port busy" },
401 { IBMVFC_BASIC_REJECT, "basic reject" },
402 };
403
404 static const char *unknown_fc_type = "unknown fc type";
405
406 /**
407 * ibmvfc_get_fc_type - Return the FC Type description text
408 * @status: FC Type error status
409 *
410 * Returns:
411 * error string
412 **/
ibmvfc_get_fc_type(u16 status)413 static const char *ibmvfc_get_fc_type(u16 status)
414 {
415 int i;
416
417 for (i = 0; i < ARRAY_SIZE(fc_type); i++)
418 if (fc_type[i].fc_type == status)
419 return fc_type[i].name;
420
421 return unknown_fc_type;
422 }
423
424 /**
425 * ibmvfc_set_tgt_action - Set the next init action for the target
426 * @tgt: ibmvfc target struct
427 * @action: action to perform
428 *
429 **/
ibmvfc_set_tgt_action(struct ibmvfc_target * tgt,enum ibmvfc_target_action action)430 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
431 enum ibmvfc_target_action action)
432 {
433 switch (tgt->action) {
434 case IBMVFC_TGT_ACTION_DEL_RPORT:
435 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
436 tgt->action = action;
437 case IBMVFC_TGT_ACTION_DELETED_RPORT:
438 break;
439 default:
440 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
441 tgt->add_rport = 0;
442 tgt->action = action;
443 break;
444 }
445 }
446
447 /**
448 * ibmvfc_set_host_state - Set the state for the host
449 * @vhost: ibmvfc host struct
450 * @state: state to set host to
451 *
452 * Returns:
453 * 0 if state changed / non-zero if not changed
454 **/
ibmvfc_set_host_state(struct ibmvfc_host * vhost,enum ibmvfc_host_state state)455 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
456 enum ibmvfc_host_state state)
457 {
458 int rc = 0;
459
460 switch (vhost->state) {
461 case IBMVFC_HOST_OFFLINE:
462 rc = -EINVAL;
463 break;
464 default:
465 vhost->state = state;
466 break;
467 }
468
469 return rc;
470 }
471
472 /**
473 * ibmvfc_set_host_action - Set the next init action for the host
474 * @vhost: ibmvfc host struct
475 * @action: action to perform
476 *
477 **/
ibmvfc_set_host_action(struct ibmvfc_host * vhost,enum ibmvfc_host_action action)478 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
479 enum ibmvfc_host_action action)
480 {
481 switch (action) {
482 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
483 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
484 vhost->action = action;
485 break;
486 case IBMVFC_HOST_ACTION_LOGO_WAIT:
487 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
488 vhost->action = action;
489 break;
490 case IBMVFC_HOST_ACTION_INIT_WAIT:
491 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
492 vhost->action = action;
493 break;
494 case IBMVFC_HOST_ACTION_QUERY:
495 switch (vhost->action) {
496 case IBMVFC_HOST_ACTION_INIT_WAIT:
497 case IBMVFC_HOST_ACTION_NONE:
498 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
499 vhost->action = action;
500 break;
501 default:
502 break;
503 }
504 break;
505 case IBMVFC_HOST_ACTION_TGT_INIT:
506 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
507 vhost->action = action;
508 break;
509 case IBMVFC_HOST_ACTION_INIT:
510 case IBMVFC_HOST_ACTION_TGT_DEL:
511 switch (vhost->action) {
512 case IBMVFC_HOST_ACTION_RESET:
513 case IBMVFC_HOST_ACTION_REENABLE:
514 break;
515 default:
516 vhost->action = action;
517 break;
518 }
519 break;
520 case IBMVFC_HOST_ACTION_LOGO:
521 case IBMVFC_HOST_ACTION_QUERY_TGTS:
522 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
523 case IBMVFC_HOST_ACTION_NONE:
524 case IBMVFC_HOST_ACTION_RESET:
525 case IBMVFC_HOST_ACTION_REENABLE:
526 default:
527 vhost->action = action;
528 break;
529 }
530 }
531
532 /**
533 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
534 * @vhost: ibmvfc host struct
535 *
536 * Return value:
537 * nothing
538 **/
ibmvfc_reinit_host(struct ibmvfc_host * vhost)539 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
540 {
541 if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
542 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
543 scsi_block_requests(vhost->host);
544 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
545 }
546 } else
547 vhost->reinit = 1;
548
549 wake_up(&vhost->work_wait_q);
550 }
551
552 /**
553 * ibmvfc_link_down - Handle a link down event from the adapter
554 * @vhost: ibmvfc host struct
555 * @state: ibmvfc host state to enter
556 *
557 **/
ibmvfc_link_down(struct ibmvfc_host * vhost,enum ibmvfc_host_state state)558 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
559 enum ibmvfc_host_state state)
560 {
561 struct ibmvfc_target *tgt;
562
563 ENTER;
564 scsi_block_requests(vhost->host);
565 list_for_each_entry(tgt, &vhost->targets, queue)
566 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
567 ibmvfc_set_host_state(vhost, state);
568 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
569 vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
570 wake_up(&vhost->work_wait_q);
571 LEAVE;
572 }
573
574 /**
575 * ibmvfc_init_host - Start host initialization
576 * @vhost: ibmvfc host struct
577 *
578 * Return value:
579 * nothing
580 **/
ibmvfc_init_host(struct ibmvfc_host * vhost)581 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
582 {
583 struct ibmvfc_target *tgt;
584
585 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
586 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
587 dev_err(vhost->dev,
588 "Host initialization retries exceeded. Taking adapter offline\n");
589 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
590 return;
591 }
592 }
593
594 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
595 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
596 vhost->async_crq.cur = 0;
597
598 list_for_each_entry(tgt, &vhost->targets, queue)
599 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
600 scsi_block_requests(vhost->host);
601 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
602 vhost->job_step = ibmvfc_npiv_login;
603 wake_up(&vhost->work_wait_q);
604 }
605 }
606
607 /**
608 * ibmvfc_send_crq - Send a CRQ
609 * @vhost: ibmvfc host struct
610 * @word1: the first 64 bits of the data
611 * @word2: the second 64 bits of the data
612 *
613 * Return value:
614 * 0 on success / other on failure
615 **/
ibmvfc_send_crq(struct ibmvfc_host * vhost,u64 word1,u64 word2)616 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
617 {
618 struct vio_dev *vdev = to_vio_dev(vhost->dev);
619 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
620 }
621
622 /**
623 * ibmvfc_send_crq_init - Send a CRQ init message
624 * @vhost: ibmvfc host struct
625 *
626 * Return value:
627 * 0 on success / other on failure
628 **/
ibmvfc_send_crq_init(struct ibmvfc_host * vhost)629 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
630 {
631 ibmvfc_dbg(vhost, "Sending CRQ init\n");
632 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
633 }
634
635 /**
636 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
637 * @vhost: ibmvfc host struct
638 *
639 * Return value:
640 * 0 on success / other on failure
641 **/
ibmvfc_send_crq_init_complete(struct ibmvfc_host * vhost)642 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
643 {
644 ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
645 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
646 }
647
648 /**
649 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
650 * @vhost: ibmvfc host struct
651 *
652 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
653 * the crq with the hypervisor.
654 **/
ibmvfc_release_crq_queue(struct ibmvfc_host * vhost)655 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
656 {
657 long rc = 0;
658 struct vio_dev *vdev = to_vio_dev(vhost->dev);
659 struct ibmvfc_crq_queue *crq = &vhost->crq;
660
661 ibmvfc_dbg(vhost, "Releasing CRQ\n");
662 free_irq(vdev->irq, vhost);
663 tasklet_kill(&vhost->tasklet);
664 do {
665 if (rc)
666 msleep(100);
667 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
668 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
669
670 vhost->state = IBMVFC_NO_CRQ;
671 vhost->logged_in = 0;
672 dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
673 free_page((unsigned long)crq->msgs);
674 }
675
676 /**
677 * ibmvfc_reenable_crq_queue - reenables the CRQ
678 * @vhost: ibmvfc host struct
679 *
680 * Return value:
681 * 0 on success / other on failure
682 **/
ibmvfc_reenable_crq_queue(struct ibmvfc_host * vhost)683 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
684 {
685 int rc = 0;
686 struct vio_dev *vdev = to_vio_dev(vhost->dev);
687
688 /* Re-enable the CRQ */
689 do {
690 if (rc)
691 msleep(100);
692 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
693 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
694
695 if (rc)
696 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
697
698 return rc;
699 }
700
701 /**
702 * ibmvfc_reset_crq - resets a crq after a failure
703 * @vhost: ibmvfc host struct
704 *
705 * Return value:
706 * 0 on success / other on failure
707 **/
ibmvfc_reset_crq(struct ibmvfc_host * vhost)708 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
709 {
710 int rc = 0;
711 unsigned long flags;
712 struct vio_dev *vdev = to_vio_dev(vhost->dev);
713 struct ibmvfc_crq_queue *crq = &vhost->crq;
714
715 /* Close the CRQ */
716 do {
717 if (rc)
718 msleep(100);
719 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
720 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
721
722 spin_lock_irqsave(vhost->host->host_lock, flags);
723 vhost->state = IBMVFC_NO_CRQ;
724 vhost->logged_in = 0;
725
726 /* Clean out the queue */
727 memset(crq->msgs, 0, PAGE_SIZE);
728 crq->cur = 0;
729
730 /* And re-open it again */
731 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
732 crq->msg_token, PAGE_SIZE);
733
734 if (rc == H_CLOSED)
735 /* Adapter is good, but other end is not ready */
736 dev_warn(vhost->dev, "Partner adapter not ready\n");
737 else if (rc != 0)
738 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
739 spin_unlock_irqrestore(vhost->host->host_lock, flags);
740
741 return rc;
742 }
743
744 /**
745 * ibmvfc_valid_event - Determines if event is valid.
746 * @pool: event_pool that contains the event
747 * @evt: ibmvfc event to be checked for validity
748 *
749 * Return value:
750 * 1 if event is valid / 0 if event is not valid
751 **/
ibmvfc_valid_event(struct ibmvfc_event_pool * pool,struct ibmvfc_event * evt)752 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
753 struct ibmvfc_event *evt)
754 {
755 int index = evt - pool->events;
756 if (index < 0 || index >= pool->size) /* outside of bounds */
757 return 0;
758 if (evt != pool->events + index) /* unaligned */
759 return 0;
760 return 1;
761 }
762
763 /**
764 * ibmvfc_free_event - Free the specified event
765 * @evt: ibmvfc_event to be freed
766 *
767 **/
ibmvfc_free_event(struct ibmvfc_event * evt)768 static void ibmvfc_free_event(struct ibmvfc_event *evt)
769 {
770 struct ibmvfc_host *vhost = evt->vhost;
771 struct ibmvfc_event_pool *pool = &vhost->pool;
772
773 BUG_ON(!ibmvfc_valid_event(pool, evt));
774 BUG_ON(atomic_inc_return(&evt->free) != 1);
775 list_add_tail(&evt->queue, &vhost->free);
776 }
777
778 /**
779 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
780 * @evt: ibmvfc event struct
781 *
782 * This function does not setup any error status, that must be done
783 * before this function gets called.
784 **/
ibmvfc_scsi_eh_done(struct ibmvfc_event * evt)785 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
786 {
787 struct scsi_cmnd *cmnd = evt->cmnd;
788
789 if (cmnd) {
790 scsi_dma_unmap(cmnd);
791 cmnd->scsi_done(cmnd);
792 }
793
794 if (evt->eh_comp)
795 complete(evt->eh_comp);
796
797 ibmvfc_free_event(evt);
798 }
799
800 /**
801 * ibmvfc_fail_request - Fail request with specified error code
802 * @evt: ibmvfc event struct
803 * @error_code: error code to fail request with
804 *
805 * Return value:
806 * none
807 **/
ibmvfc_fail_request(struct ibmvfc_event * evt,int error_code)808 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
809 {
810 if (evt->cmnd) {
811 evt->cmnd->result = (error_code << 16);
812 evt->done = ibmvfc_scsi_eh_done;
813 } else
814 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
815
816 list_del(&evt->queue);
817 del_timer(&evt->timer);
818 ibmvfc_trc_end(evt);
819 evt->done(evt);
820 }
821
822 /**
823 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
824 * @vhost: ibmvfc host struct
825 * @error_code: error code to fail requests with
826 *
827 * Return value:
828 * none
829 **/
ibmvfc_purge_requests(struct ibmvfc_host * vhost,int error_code)830 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
831 {
832 struct ibmvfc_event *evt, *pos;
833
834 ibmvfc_dbg(vhost, "Purging all requests\n");
835 list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
836 ibmvfc_fail_request(evt, error_code);
837 }
838
839 /**
840 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
841 * @vhost: struct ibmvfc host to reset
842 **/
ibmvfc_hard_reset_host(struct ibmvfc_host * vhost)843 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
844 {
845 ibmvfc_purge_requests(vhost, DID_ERROR);
846 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
847 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
848 }
849
850 /**
851 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
852 * @vhost: struct ibmvfc host to reset
853 **/
__ibmvfc_reset_host(struct ibmvfc_host * vhost)854 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
855 {
856 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
857 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
858 scsi_block_requests(vhost->host);
859 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
860 vhost->job_step = ibmvfc_npiv_logout;
861 wake_up(&vhost->work_wait_q);
862 } else
863 ibmvfc_hard_reset_host(vhost);
864 }
865
866 /**
867 * ibmvfc_reset_host - Reset the connection to the server
868 * @vhost: ibmvfc host struct
869 **/
ibmvfc_reset_host(struct ibmvfc_host * vhost)870 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
871 {
872 unsigned long flags;
873
874 spin_lock_irqsave(vhost->host->host_lock, flags);
875 __ibmvfc_reset_host(vhost);
876 spin_unlock_irqrestore(vhost->host->host_lock, flags);
877 }
878
879 /**
880 * ibmvfc_retry_host_init - Retry host initialization if allowed
881 * @vhost: ibmvfc host struct
882 *
883 * Returns: 1 if init will be retried / 0 if not
884 *
885 **/
ibmvfc_retry_host_init(struct ibmvfc_host * vhost)886 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
887 {
888 int retry = 0;
889
890 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
891 vhost->delay_init = 1;
892 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
893 dev_err(vhost->dev,
894 "Host initialization retries exceeded. Taking adapter offline\n");
895 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
896 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
897 __ibmvfc_reset_host(vhost);
898 else {
899 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
900 retry = 1;
901 }
902 }
903
904 wake_up(&vhost->work_wait_q);
905 return retry;
906 }
907
908 /**
909 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
910 * @starget: scsi target struct
911 *
912 * Return value:
913 * ibmvfc_target struct / NULL if not found
914 **/
__ibmvfc_get_target(struct scsi_target * starget)915 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
916 {
917 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
918 struct ibmvfc_host *vhost = shost_priv(shost);
919 struct ibmvfc_target *tgt;
920
921 list_for_each_entry(tgt, &vhost->targets, queue)
922 if (tgt->target_id == starget->id) {
923 kref_get(&tgt->kref);
924 return tgt;
925 }
926 return NULL;
927 }
928
929 /**
930 * ibmvfc_get_target - Find the specified scsi_target
931 * @starget: scsi target struct
932 *
933 * Return value:
934 * ibmvfc_target struct / NULL if not found
935 **/
ibmvfc_get_target(struct scsi_target * starget)936 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
937 {
938 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
939 struct ibmvfc_target *tgt;
940 unsigned long flags;
941
942 spin_lock_irqsave(shost->host_lock, flags);
943 tgt = __ibmvfc_get_target(starget);
944 spin_unlock_irqrestore(shost->host_lock, flags);
945 return tgt;
946 }
947
948 /**
949 * ibmvfc_get_host_speed - Get host port speed
950 * @shost: scsi host struct
951 *
952 * Return value:
953 * none
954 **/
ibmvfc_get_host_speed(struct Scsi_Host * shost)955 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
956 {
957 struct ibmvfc_host *vhost = shost_priv(shost);
958 unsigned long flags;
959
960 spin_lock_irqsave(shost->host_lock, flags);
961 if (vhost->state == IBMVFC_ACTIVE) {
962 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
963 case 1:
964 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
965 break;
966 case 2:
967 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
968 break;
969 case 4:
970 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
971 break;
972 case 8:
973 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
974 break;
975 case 10:
976 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
977 break;
978 case 16:
979 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
980 break;
981 default:
982 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
983 be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
984 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
985 break;
986 }
987 } else
988 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
989 spin_unlock_irqrestore(shost->host_lock, flags);
990 }
991
992 /**
993 * ibmvfc_get_host_port_state - Get host port state
994 * @shost: scsi host struct
995 *
996 * Return value:
997 * none
998 **/
ibmvfc_get_host_port_state(struct Scsi_Host * shost)999 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1000 {
1001 struct ibmvfc_host *vhost = shost_priv(shost);
1002 unsigned long flags;
1003
1004 spin_lock_irqsave(shost->host_lock, flags);
1005 switch (vhost->state) {
1006 case IBMVFC_INITIALIZING:
1007 case IBMVFC_ACTIVE:
1008 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1009 break;
1010 case IBMVFC_LINK_DOWN:
1011 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1012 break;
1013 case IBMVFC_LINK_DEAD:
1014 case IBMVFC_HOST_OFFLINE:
1015 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1016 break;
1017 case IBMVFC_HALTED:
1018 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1019 break;
1020 case IBMVFC_NO_CRQ:
1021 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022 break;
1023 default:
1024 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1025 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1026 break;
1027 }
1028 spin_unlock_irqrestore(shost->host_lock, flags);
1029 }
1030
1031 /**
1032 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1033 * @rport: rport struct
1034 * @timeout: timeout value
1035 *
1036 * Return value:
1037 * none
1038 **/
ibmvfc_set_rport_dev_loss_tmo(struct fc_rport * rport,u32 timeout)1039 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1040 {
1041 if (timeout)
1042 rport->dev_loss_tmo = timeout;
1043 else
1044 rport->dev_loss_tmo = 1;
1045 }
1046
1047 /**
1048 * ibmvfc_release_tgt - Free memory allocated for a target
1049 * @kref: kref struct
1050 *
1051 **/
ibmvfc_release_tgt(struct kref * kref)1052 static void ibmvfc_release_tgt(struct kref *kref)
1053 {
1054 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1055 kfree(tgt);
1056 }
1057
1058 /**
1059 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1060 * @starget: scsi target struct
1061 *
1062 * Return value:
1063 * none
1064 **/
ibmvfc_get_starget_node_name(struct scsi_target * starget)1065 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1066 {
1067 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1068 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1069 if (tgt)
1070 kref_put(&tgt->kref, ibmvfc_release_tgt);
1071 }
1072
1073 /**
1074 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1075 * @starget: scsi target struct
1076 *
1077 * Return value:
1078 * none
1079 **/
ibmvfc_get_starget_port_name(struct scsi_target * starget)1080 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1081 {
1082 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1083 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1084 if (tgt)
1085 kref_put(&tgt->kref, ibmvfc_release_tgt);
1086 }
1087
1088 /**
1089 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1090 * @starget: scsi target struct
1091 *
1092 * Return value:
1093 * none
1094 **/
ibmvfc_get_starget_port_id(struct scsi_target * starget)1095 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1096 {
1097 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1098 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1099 if (tgt)
1100 kref_put(&tgt->kref, ibmvfc_release_tgt);
1101 }
1102
1103 /**
1104 * ibmvfc_wait_while_resetting - Wait while the host resets
1105 * @vhost: ibmvfc host struct
1106 *
1107 * Return value:
1108 * 0 on success / other on failure
1109 **/
ibmvfc_wait_while_resetting(struct ibmvfc_host * vhost)1110 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1111 {
1112 long timeout = wait_event_timeout(vhost->init_wait_q,
1113 ((vhost->state == IBMVFC_ACTIVE ||
1114 vhost->state == IBMVFC_HOST_OFFLINE ||
1115 vhost->state == IBMVFC_LINK_DEAD) &&
1116 vhost->action == IBMVFC_HOST_ACTION_NONE),
1117 (init_timeout * HZ));
1118
1119 return timeout ? 0 : -EIO;
1120 }
1121
1122 /**
1123 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1124 * @shost: scsi host struct
1125 *
1126 * Return value:
1127 * 0 on success / other on failure
1128 **/
ibmvfc_issue_fc_host_lip(struct Scsi_Host * shost)1129 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1130 {
1131 struct ibmvfc_host *vhost = shost_priv(shost);
1132
1133 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1134 ibmvfc_reset_host(vhost);
1135 return ibmvfc_wait_while_resetting(vhost);
1136 }
1137
1138 /**
1139 * ibmvfc_gather_partition_info - Gather info about the LPAR
1140 *
1141 * Return value:
1142 * none
1143 **/
ibmvfc_gather_partition_info(struct ibmvfc_host * vhost)1144 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1145 {
1146 struct device_node *rootdn;
1147 const char *name;
1148 const unsigned int *num;
1149
1150 rootdn = of_find_node_by_path("/");
1151 if (!rootdn)
1152 return;
1153
1154 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1155 if (name)
1156 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1157 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1158 if (num)
1159 vhost->partition_number = *num;
1160 of_node_put(rootdn);
1161 }
1162
1163 /**
1164 * ibmvfc_set_login_info - Setup info for NPIV login
1165 * @vhost: ibmvfc host struct
1166 *
1167 * Return value:
1168 * none
1169 **/
ibmvfc_set_login_info(struct ibmvfc_host * vhost)1170 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1171 {
1172 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1173 struct device_node *of_node = vhost->dev->of_node;
1174 const char *location;
1175
1176 memset(login_info, 0, sizeof(*login_info));
1177
1178 login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1179 login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1180 login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1181 login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1182 login_info->partition_num = cpu_to_be32(vhost->partition_number);
1183 login_info->vfc_frame_version = cpu_to_be32(1);
1184 login_info->fcp_version = cpu_to_be16(3);
1185 login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1186 if (vhost->client_migrated)
1187 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1188
1189 login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1190 login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1191 login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1192 login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1193 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1194 strncpy(login_info->device_name,
1195 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1196
1197 location = of_get_property(of_node, "ibm,loc-code", NULL);
1198 location = location ? location : dev_name(vhost->dev);
1199 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1200 }
1201
1202 /**
1203 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1204 * @vhost: ibmvfc host who owns the event pool
1205 *
1206 * Returns zero on success.
1207 **/
ibmvfc_init_event_pool(struct ibmvfc_host * vhost)1208 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1209 {
1210 int i;
1211 struct ibmvfc_event_pool *pool = &vhost->pool;
1212
1213 ENTER;
1214 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1215 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1216 if (!pool->events)
1217 return -ENOMEM;
1218
1219 pool->iu_storage = dma_alloc_coherent(vhost->dev,
1220 pool->size * sizeof(*pool->iu_storage),
1221 &pool->iu_token, 0);
1222
1223 if (!pool->iu_storage) {
1224 kfree(pool->events);
1225 return -ENOMEM;
1226 }
1227
1228 for (i = 0; i < pool->size; ++i) {
1229 struct ibmvfc_event *evt = &pool->events[i];
1230 atomic_set(&evt->free, 1);
1231 evt->crq.valid = 0x80;
1232 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1233 evt->xfer_iu = pool->iu_storage + i;
1234 evt->vhost = vhost;
1235 evt->ext_list = NULL;
1236 list_add_tail(&evt->queue, &vhost->free);
1237 }
1238
1239 LEAVE;
1240 return 0;
1241 }
1242
1243 /**
1244 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1245 * @vhost: ibmvfc host who owns the event pool
1246 *
1247 **/
ibmvfc_free_event_pool(struct ibmvfc_host * vhost)1248 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1249 {
1250 int i;
1251 struct ibmvfc_event_pool *pool = &vhost->pool;
1252
1253 ENTER;
1254 for (i = 0; i < pool->size; ++i) {
1255 list_del(&pool->events[i].queue);
1256 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1257 if (pool->events[i].ext_list)
1258 dma_pool_free(vhost->sg_pool,
1259 pool->events[i].ext_list,
1260 pool->events[i].ext_list_token);
1261 }
1262
1263 kfree(pool->events);
1264 dma_free_coherent(vhost->dev,
1265 pool->size * sizeof(*pool->iu_storage),
1266 pool->iu_storage, pool->iu_token);
1267 LEAVE;
1268 }
1269
1270 /**
1271 * ibmvfc_get_event - Gets the next free event in pool
1272 * @vhost: ibmvfc host struct
1273 *
1274 * Returns a free event from the pool.
1275 **/
ibmvfc_get_event(struct ibmvfc_host * vhost)1276 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1277 {
1278 struct ibmvfc_event *evt;
1279
1280 BUG_ON(list_empty(&vhost->free));
1281 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1282 atomic_set(&evt->free, 0);
1283 list_del(&evt->queue);
1284 return evt;
1285 }
1286
1287 /**
1288 * ibmvfc_init_event - Initialize fields in an event struct that are always
1289 * required.
1290 * @evt: The event
1291 * @done: Routine to call when the event is responded to
1292 * @format: SRP or MAD format
1293 **/
ibmvfc_init_event(struct ibmvfc_event * evt,void (* done)(struct ibmvfc_event *),u8 format)1294 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1295 void (*done) (struct ibmvfc_event *), u8 format)
1296 {
1297 evt->cmnd = NULL;
1298 evt->sync_iu = NULL;
1299 evt->crq.format = format;
1300 evt->done = done;
1301 evt->eh_comp = NULL;
1302 }
1303
1304 /**
1305 * ibmvfc_map_sg_list - Initialize scatterlist
1306 * @scmd: scsi command struct
1307 * @nseg: number of scatterlist segments
1308 * @md: memory descriptor list to initialize
1309 **/
ibmvfc_map_sg_list(struct scsi_cmnd * scmd,int nseg,struct srp_direct_buf * md)1310 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1311 struct srp_direct_buf *md)
1312 {
1313 int i;
1314 struct scatterlist *sg;
1315
1316 scsi_for_each_sg(scmd, sg, nseg, i) {
1317 md[i].va = cpu_to_be64(sg_dma_address(sg));
1318 md[i].len = cpu_to_be32(sg_dma_len(sg));
1319 md[i].key = 0;
1320 }
1321 }
1322
1323 /**
1324 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1325 * @scmd: struct scsi_cmnd with the scatterlist
1326 * @evt: ibmvfc event struct
1327 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1328 * @dev: device for which to map dma memory
1329 *
1330 * Returns:
1331 * 0 on success / non-zero on failure
1332 **/
ibmvfc_map_sg_data(struct scsi_cmnd * scmd,struct ibmvfc_event * evt,struct ibmvfc_cmd * vfc_cmd,struct device * dev)1333 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1334 struct ibmvfc_event *evt,
1335 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1336 {
1337
1338 int sg_mapped;
1339 struct srp_direct_buf *data = &vfc_cmd->ioba;
1340 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1341
1342 if (cls3_error)
1343 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1344
1345 sg_mapped = scsi_dma_map(scmd);
1346 if (!sg_mapped) {
1347 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1348 return 0;
1349 } else if (unlikely(sg_mapped < 0)) {
1350 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1351 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1352 return sg_mapped;
1353 }
1354
1355 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1356 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1357 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1358 } else {
1359 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1360 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1361 }
1362
1363 if (sg_mapped == 1) {
1364 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1365 return 0;
1366 }
1367
1368 vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1369
1370 if (!evt->ext_list) {
1371 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1372 &evt->ext_list_token);
1373
1374 if (!evt->ext_list) {
1375 scsi_dma_unmap(scmd);
1376 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1377 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1378 return -ENOMEM;
1379 }
1380 }
1381
1382 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1383
1384 data->va = cpu_to_be64(evt->ext_list_token);
1385 data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1386 data->key = 0;
1387 return 0;
1388 }
1389
1390 /**
1391 * ibmvfc_timeout - Internal command timeout handler
1392 * @evt: struct ibmvfc_event that timed out
1393 *
1394 * Called when an internally generated command times out
1395 **/
ibmvfc_timeout(struct timer_list * t)1396 static void ibmvfc_timeout(struct timer_list *t)
1397 {
1398 struct ibmvfc_event *evt = from_timer(evt, t, timer);
1399 struct ibmvfc_host *vhost = evt->vhost;
1400 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1401 ibmvfc_reset_host(vhost);
1402 }
1403
1404 /**
1405 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1406 * @evt: event to be sent
1407 * @vhost: ibmvfc host struct
1408 * @timeout: timeout in seconds - 0 means do not time command
1409 *
1410 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1411 **/
ibmvfc_send_event(struct ibmvfc_event * evt,struct ibmvfc_host * vhost,unsigned long timeout)1412 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1413 struct ibmvfc_host *vhost, unsigned long timeout)
1414 {
1415 __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1416 int rc;
1417
1418 /* Copy the IU into the transfer area */
1419 *evt->xfer_iu = evt->iu;
1420 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1421 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1422 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1423 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1424 else
1425 BUG();
1426
1427 list_add_tail(&evt->queue, &vhost->sent);
1428 timer_setup(&evt->timer, ibmvfc_timeout, 0);
1429
1430 if (timeout) {
1431 evt->timer.expires = jiffies + (timeout * HZ);
1432 add_timer(&evt->timer);
1433 }
1434
1435 mb();
1436
1437 if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1438 be64_to_cpu(crq_as_u64[1])))) {
1439 list_del(&evt->queue);
1440 del_timer(&evt->timer);
1441
1442 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1443 * Firmware will send a CRQ with a transport event (0xFF) to
1444 * tell this client what has happened to the transport. This
1445 * will be handled in ibmvfc_handle_crq()
1446 */
1447 if (rc == H_CLOSED) {
1448 if (printk_ratelimit())
1449 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1450 if (evt->cmnd)
1451 scsi_dma_unmap(evt->cmnd);
1452 ibmvfc_free_event(evt);
1453 return SCSI_MLQUEUE_HOST_BUSY;
1454 }
1455
1456 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1457 if (evt->cmnd) {
1458 evt->cmnd->result = DID_ERROR << 16;
1459 evt->done = ibmvfc_scsi_eh_done;
1460 } else
1461 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1462
1463 evt->done(evt);
1464 } else
1465 ibmvfc_trc_start(evt);
1466
1467 return 0;
1468 }
1469
1470 /**
1471 * ibmvfc_log_error - Log an error for the failed command if appropriate
1472 * @evt: ibmvfc event to log
1473 *
1474 **/
ibmvfc_log_error(struct ibmvfc_event * evt)1475 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1476 {
1477 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1478 struct ibmvfc_host *vhost = evt->vhost;
1479 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1480 struct scsi_cmnd *cmnd = evt->cmnd;
1481 const char *err = unknown_error;
1482 int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1483 int logerr = 0;
1484 int rsp_code = 0;
1485
1486 if (index >= 0) {
1487 logerr = cmd_status[index].log;
1488 err = cmd_status[index].name;
1489 }
1490
1491 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1492 return;
1493
1494 if (rsp->flags & FCP_RSP_LEN_VALID)
1495 rsp_code = rsp->data.info.rsp_code;
1496
1497 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1498 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1499 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1500 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1501 }
1502
1503 /**
1504 * ibmvfc_relogin - Log back into the specified device
1505 * @sdev: scsi device struct
1506 *
1507 **/
ibmvfc_relogin(struct scsi_device * sdev)1508 static void ibmvfc_relogin(struct scsi_device *sdev)
1509 {
1510 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1511 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1512 struct ibmvfc_target *tgt;
1513
1514 list_for_each_entry(tgt, &vhost->targets, queue) {
1515 if (rport == tgt->rport) {
1516 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1517 break;
1518 }
1519 }
1520
1521 ibmvfc_reinit_host(vhost);
1522 }
1523
1524 /**
1525 * ibmvfc_scsi_done - Handle responses from commands
1526 * @evt: ibmvfc event to be handled
1527 *
1528 * Used as a callback when sending scsi cmds.
1529 **/
ibmvfc_scsi_done(struct ibmvfc_event * evt)1530 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1531 {
1532 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1533 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1534 struct scsi_cmnd *cmnd = evt->cmnd;
1535 u32 rsp_len = 0;
1536 u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1537
1538 if (cmnd) {
1539 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1540 scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1541 else if (rsp->flags & FCP_RESID_UNDER)
1542 scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1543 else
1544 scsi_set_resid(cmnd, 0);
1545
1546 if (vfc_cmd->status) {
1547 cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1548
1549 if (rsp->flags & FCP_RSP_LEN_VALID)
1550 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1551 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1552 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1553 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1554 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1555 if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1556 (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1557 ibmvfc_relogin(cmnd->device);
1558
1559 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1560 cmnd->result = (DID_ERROR << 16);
1561
1562 ibmvfc_log_error(evt);
1563 }
1564
1565 if (!cmnd->result &&
1566 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1567 cmnd->result = (DID_ERROR << 16);
1568
1569 scsi_dma_unmap(cmnd);
1570 cmnd->scsi_done(cmnd);
1571 }
1572
1573 if (evt->eh_comp)
1574 complete(evt->eh_comp);
1575
1576 ibmvfc_free_event(evt);
1577 }
1578
1579 /**
1580 * ibmvfc_host_chkready - Check if the host can accept commands
1581 * @vhost: struct ibmvfc host
1582 *
1583 * Returns:
1584 * 1 if host can accept command / 0 if not
1585 **/
ibmvfc_host_chkready(struct ibmvfc_host * vhost)1586 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1587 {
1588 int result = 0;
1589
1590 switch (vhost->state) {
1591 case IBMVFC_LINK_DEAD:
1592 case IBMVFC_HOST_OFFLINE:
1593 result = DID_NO_CONNECT << 16;
1594 break;
1595 case IBMVFC_NO_CRQ:
1596 case IBMVFC_INITIALIZING:
1597 case IBMVFC_HALTED:
1598 case IBMVFC_LINK_DOWN:
1599 result = DID_REQUEUE << 16;
1600 break;
1601 case IBMVFC_ACTIVE:
1602 result = 0;
1603 break;
1604 }
1605
1606 return result;
1607 }
1608
1609 /**
1610 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1611 * @cmnd: struct scsi_cmnd to be executed
1612 * @done: Callback function to be called when cmnd is completed
1613 *
1614 * Returns:
1615 * 0 on success / other on failure
1616 **/
ibmvfc_queuecommand_lck(struct scsi_cmnd * cmnd,void (* done)(struct scsi_cmnd *))1617 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1618 void (*done) (struct scsi_cmnd *))
1619 {
1620 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1621 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1622 struct ibmvfc_cmd *vfc_cmd;
1623 struct ibmvfc_event *evt;
1624 int rc;
1625
1626 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1627 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1628 cmnd->result = rc;
1629 done(cmnd);
1630 return 0;
1631 }
1632
1633 cmnd->result = (DID_OK << 16);
1634 evt = ibmvfc_get_event(vhost);
1635 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1636 evt->cmnd = cmnd;
1637 cmnd->scsi_done = done;
1638 vfc_cmd = &evt->iu.cmd;
1639 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1640 vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1641 vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1642 vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1643 vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1644 vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1645 vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1646 vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1647 vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1648 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1649 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1650
1651 if (cmnd->flags & SCMD_TAGGED) {
1652 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1653 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1654 }
1655
1656 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1657 return ibmvfc_send_event(evt, vhost, 0);
1658
1659 ibmvfc_free_event(evt);
1660 if (rc == -ENOMEM)
1661 return SCSI_MLQUEUE_HOST_BUSY;
1662
1663 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1664 scmd_printk(KERN_ERR, cmnd,
1665 "Failed to map DMA buffer for command. rc=%d\n", rc);
1666
1667 cmnd->result = DID_ERROR << 16;
1668 done(cmnd);
1669 return 0;
1670 }
1671
DEF_SCSI_QCMD(ibmvfc_queuecommand)1672 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1673
1674 /**
1675 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1676 * @evt: ibmvfc event struct
1677 *
1678 **/
1679 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1680 {
1681 /* copy the response back */
1682 if (evt->sync_iu)
1683 *evt->sync_iu = *evt->xfer_iu;
1684
1685 complete(&evt->comp);
1686 }
1687
1688 /**
1689 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1690 * @evt: struct ibmvfc_event
1691 *
1692 **/
ibmvfc_bsg_timeout_done(struct ibmvfc_event * evt)1693 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1694 {
1695 struct ibmvfc_host *vhost = evt->vhost;
1696
1697 ibmvfc_free_event(evt);
1698 vhost->aborting_passthru = 0;
1699 dev_info(vhost->dev, "Passthru command cancelled\n");
1700 }
1701
1702 /**
1703 * ibmvfc_bsg_timeout - Handle a BSG timeout
1704 * @job: struct bsg_job that timed out
1705 *
1706 * Returns:
1707 * 0 on success / other on failure
1708 **/
ibmvfc_bsg_timeout(struct bsg_job * job)1709 static int ibmvfc_bsg_timeout(struct bsg_job *job)
1710 {
1711 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1712 unsigned long port_id = (unsigned long)job->dd_data;
1713 struct ibmvfc_event *evt;
1714 struct ibmvfc_tmf *tmf;
1715 unsigned long flags;
1716 int rc;
1717
1718 ENTER;
1719 spin_lock_irqsave(vhost->host->host_lock, flags);
1720 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1721 __ibmvfc_reset_host(vhost);
1722 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1723 return 0;
1724 }
1725
1726 vhost->aborting_passthru = 1;
1727 evt = ibmvfc_get_event(vhost);
1728 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1729
1730 tmf = &evt->iu.tmf;
1731 memset(tmf, 0, sizeof(*tmf));
1732 tmf->common.version = cpu_to_be32(1);
1733 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1734 tmf->common.length = cpu_to_be16(sizeof(*tmf));
1735 tmf->scsi_id = cpu_to_be64(port_id);
1736 tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1737 tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1738 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1739
1740 if (rc != 0) {
1741 vhost->aborting_passthru = 0;
1742 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1743 rc = -EIO;
1744 } else
1745 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1746 port_id);
1747
1748 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1749
1750 LEAVE;
1751 return rc;
1752 }
1753
1754 /**
1755 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1756 * @vhost: struct ibmvfc_host to send command
1757 * @port_id: port ID to send command
1758 *
1759 * Returns:
1760 * 0 on success / other on failure
1761 **/
ibmvfc_bsg_plogi(struct ibmvfc_host * vhost,unsigned int port_id)1762 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1763 {
1764 struct ibmvfc_port_login *plogi;
1765 struct ibmvfc_target *tgt;
1766 struct ibmvfc_event *evt;
1767 union ibmvfc_iu rsp_iu;
1768 unsigned long flags;
1769 int rc = 0, issue_login = 1;
1770
1771 ENTER;
1772 spin_lock_irqsave(vhost->host->host_lock, flags);
1773 list_for_each_entry(tgt, &vhost->targets, queue) {
1774 if (tgt->scsi_id == port_id) {
1775 issue_login = 0;
1776 break;
1777 }
1778 }
1779
1780 if (!issue_login)
1781 goto unlock_out;
1782 if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1783 goto unlock_out;
1784
1785 evt = ibmvfc_get_event(vhost);
1786 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1787 plogi = &evt->iu.plogi;
1788 memset(plogi, 0, sizeof(*plogi));
1789 plogi->common.version = cpu_to_be32(1);
1790 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1791 plogi->common.length = cpu_to_be16(sizeof(*plogi));
1792 plogi->scsi_id = cpu_to_be64(port_id);
1793 evt->sync_iu = &rsp_iu;
1794 init_completion(&evt->comp);
1795
1796 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1797 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1798
1799 if (rc)
1800 return -EIO;
1801
1802 wait_for_completion(&evt->comp);
1803
1804 if (rsp_iu.plogi.common.status)
1805 rc = -EIO;
1806
1807 spin_lock_irqsave(vhost->host->host_lock, flags);
1808 ibmvfc_free_event(evt);
1809 unlock_out:
1810 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1811 LEAVE;
1812 return rc;
1813 }
1814
1815 /**
1816 * ibmvfc_bsg_request - Handle a BSG request
1817 * @job: struct bsg_job to be executed
1818 *
1819 * Returns:
1820 * 0 on success / other on failure
1821 **/
ibmvfc_bsg_request(struct bsg_job * job)1822 static int ibmvfc_bsg_request(struct bsg_job *job)
1823 {
1824 struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
1825 struct fc_rport *rport = fc_bsg_to_rport(job);
1826 struct ibmvfc_passthru_mad *mad;
1827 struct ibmvfc_event *evt;
1828 union ibmvfc_iu rsp_iu;
1829 unsigned long flags, port_id = -1;
1830 struct fc_bsg_request *bsg_request = job->request;
1831 struct fc_bsg_reply *bsg_reply = job->reply;
1832 unsigned int code = bsg_request->msgcode;
1833 int rc = 0, req_seg, rsp_seg, issue_login = 0;
1834 u32 fc_flags, rsp_len;
1835
1836 ENTER;
1837 bsg_reply->reply_payload_rcv_len = 0;
1838 if (rport)
1839 port_id = rport->port_id;
1840
1841 switch (code) {
1842 case FC_BSG_HST_ELS_NOLOGIN:
1843 port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
1844 (bsg_request->rqst_data.h_els.port_id[1] << 8) |
1845 bsg_request->rqst_data.h_els.port_id[2];
1846 case FC_BSG_RPT_ELS:
1847 fc_flags = IBMVFC_FC_ELS;
1848 break;
1849 case FC_BSG_HST_CT:
1850 issue_login = 1;
1851 port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
1852 (bsg_request->rqst_data.h_ct.port_id[1] << 8) |
1853 bsg_request->rqst_data.h_ct.port_id[2];
1854 case FC_BSG_RPT_CT:
1855 fc_flags = IBMVFC_FC_CT_IU;
1856 break;
1857 default:
1858 return -ENOTSUPP;
1859 }
1860
1861 if (port_id == -1)
1862 return -EINVAL;
1863 if (!mutex_trylock(&vhost->passthru_mutex))
1864 return -EBUSY;
1865
1866 job->dd_data = (void *)port_id;
1867 req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1868 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1869
1870 if (!req_seg) {
1871 mutex_unlock(&vhost->passthru_mutex);
1872 return -ENOMEM;
1873 }
1874
1875 rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1876 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1877
1878 if (!rsp_seg) {
1879 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1880 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1881 mutex_unlock(&vhost->passthru_mutex);
1882 return -ENOMEM;
1883 }
1884
1885 if (req_seg > 1 || rsp_seg > 1) {
1886 rc = -EINVAL;
1887 goto out;
1888 }
1889
1890 if (issue_login)
1891 rc = ibmvfc_bsg_plogi(vhost, port_id);
1892
1893 spin_lock_irqsave(vhost->host->host_lock, flags);
1894
1895 if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1896 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1897 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1898 goto out;
1899 }
1900
1901 evt = ibmvfc_get_event(vhost);
1902 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1903 mad = &evt->iu.passthru;
1904
1905 memset(mad, 0, sizeof(*mad));
1906 mad->common.version = cpu_to_be32(1);
1907 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1908 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1909
1910 mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1911 offsetof(struct ibmvfc_passthru_mad, iu));
1912 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1913
1914 mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1915 mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1916 mad->iu.flags = cpu_to_be32(fc_flags);
1917 mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1918
1919 mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1920 mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1921 mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1922 mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1923 mad->iu.scsi_id = cpu_to_be64(port_id);
1924 mad->iu.tag = cpu_to_be64((u64)evt);
1925 rsp_len = be32_to_cpu(mad->iu.rsp.len);
1926
1927 evt->sync_iu = &rsp_iu;
1928 init_completion(&evt->comp);
1929 rc = ibmvfc_send_event(evt, vhost, 0);
1930 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1931
1932 if (rc) {
1933 rc = -EIO;
1934 goto out;
1935 }
1936
1937 wait_for_completion(&evt->comp);
1938
1939 if (rsp_iu.passthru.common.status)
1940 rc = -EIO;
1941 else
1942 bsg_reply->reply_payload_rcv_len = rsp_len;
1943
1944 spin_lock_irqsave(vhost->host->host_lock, flags);
1945 ibmvfc_free_event(evt);
1946 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1947 bsg_reply->result = rc;
1948 bsg_job_done(job, bsg_reply->result,
1949 bsg_reply->reply_payload_rcv_len);
1950 rc = 0;
1951 out:
1952 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1953 job->request_payload.sg_cnt, DMA_TO_DEVICE);
1954 dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1955 job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1956 mutex_unlock(&vhost->passthru_mutex);
1957 LEAVE;
1958 return rc;
1959 }
1960
1961 /**
1962 * ibmvfc_reset_device - Reset the device with the specified reset type
1963 * @sdev: scsi device to reset
1964 * @type: reset type
1965 * @desc: reset type description for log messages
1966 *
1967 * Returns:
1968 * 0 on success / other on failure
1969 **/
ibmvfc_reset_device(struct scsi_device * sdev,int type,char * desc)1970 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1971 {
1972 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1973 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1974 struct ibmvfc_cmd *tmf;
1975 struct ibmvfc_event *evt = NULL;
1976 union ibmvfc_iu rsp_iu;
1977 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1978 int rsp_rc = -EBUSY;
1979 unsigned long flags;
1980 int rsp_code = 0;
1981
1982 spin_lock_irqsave(vhost->host->host_lock, flags);
1983 if (vhost->state == IBMVFC_ACTIVE) {
1984 evt = ibmvfc_get_event(vhost);
1985 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1986
1987 tmf = &evt->iu.cmd;
1988 memset(tmf, 0, sizeof(*tmf));
1989 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1990 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1991 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1992 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1993 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1994 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1995 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1996 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1997 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1998 tmf->iu.tmf_flags = type;
1999 evt->sync_iu = &rsp_iu;
2000
2001 init_completion(&evt->comp);
2002 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2003 }
2004 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2005
2006 if (rsp_rc != 0) {
2007 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2008 desc, rsp_rc);
2009 return -EIO;
2010 }
2011
2012 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2013 wait_for_completion(&evt->comp);
2014
2015 if (rsp_iu.cmd.status)
2016 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2017
2018 if (rsp_code) {
2019 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2020 rsp_code = fc_rsp->data.info.rsp_code;
2021
2022 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2023 "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2024 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2025 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2026 fc_rsp->scsi_status);
2027 rsp_rc = -EIO;
2028 } else
2029 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2030
2031 spin_lock_irqsave(vhost->host->host_lock, flags);
2032 ibmvfc_free_event(evt);
2033 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2034 return rsp_rc;
2035 }
2036
2037 /**
2038 * ibmvfc_match_rport - Match function for specified remote port
2039 * @evt: ibmvfc event struct
2040 * @device: device to match (rport)
2041 *
2042 * Returns:
2043 * 1 if event matches rport / 0 if event does not match rport
2044 **/
ibmvfc_match_rport(struct ibmvfc_event * evt,void * rport)2045 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2046 {
2047 struct fc_rport *cmd_rport;
2048
2049 if (evt->cmnd) {
2050 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2051 if (cmd_rport == rport)
2052 return 1;
2053 }
2054 return 0;
2055 }
2056
2057 /**
2058 * ibmvfc_match_target - Match function for specified target
2059 * @evt: ibmvfc event struct
2060 * @device: device to match (starget)
2061 *
2062 * Returns:
2063 * 1 if event matches starget / 0 if event does not match starget
2064 **/
ibmvfc_match_target(struct ibmvfc_event * evt,void * device)2065 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2066 {
2067 if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2068 return 1;
2069 return 0;
2070 }
2071
2072 /**
2073 * ibmvfc_match_lun - Match function for specified LUN
2074 * @evt: ibmvfc event struct
2075 * @device: device to match (sdev)
2076 *
2077 * Returns:
2078 * 1 if event matches sdev / 0 if event does not match sdev
2079 **/
ibmvfc_match_lun(struct ibmvfc_event * evt,void * device)2080 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2081 {
2082 if (evt->cmnd && evt->cmnd->device == device)
2083 return 1;
2084 return 0;
2085 }
2086
2087 /**
2088 * ibmvfc_wait_for_ops - Wait for ops to complete
2089 * @vhost: ibmvfc host struct
2090 * @device: device to match (starget or sdev)
2091 * @match: match function
2092 *
2093 * Returns:
2094 * SUCCESS / FAILED
2095 **/
ibmvfc_wait_for_ops(struct ibmvfc_host * vhost,void * device,int (* match)(struct ibmvfc_event *,void *))2096 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2097 int (*match) (struct ibmvfc_event *, void *))
2098 {
2099 struct ibmvfc_event *evt;
2100 DECLARE_COMPLETION_ONSTACK(comp);
2101 int wait;
2102 unsigned long flags;
2103 signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2104
2105 ENTER;
2106 do {
2107 wait = 0;
2108 spin_lock_irqsave(vhost->host->host_lock, flags);
2109 list_for_each_entry(evt, &vhost->sent, queue) {
2110 if (match(evt, device)) {
2111 evt->eh_comp = ∁
2112 wait++;
2113 }
2114 }
2115 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2116
2117 if (wait) {
2118 timeout = wait_for_completion_timeout(&comp, timeout);
2119
2120 if (!timeout) {
2121 wait = 0;
2122 spin_lock_irqsave(vhost->host->host_lock, flags);
2123 list_for_each_entry(evt, &vhost->sent, queue) {
2124 if (match(evt, device)) {
2125 evt->eh_comp = NULL;
2126 wait++;
2127 }
2128 }
2129 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2130 if (wait)
2131 dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2132 LEAVE;
2133 return wait ? FAILED : SUCCESS;
2134 }
2135 }
2136 } while (wait);
2137
2138 LEAVE;
2139 return SUCCESS;
2140 }
2141
2142 /**
2143 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2144 * @sdev: scsi device to cancel commands
2145 * @type: type of error recovery being performed
2146 *
2147 * This sends a cancel to the VIOS for the specified device. This does
2148 * NOT send any abort to the actual device. That must be done separately.
2149 *
2150 * Returns:
2151 * 0 on success / other on failure
2152 **/
ibmvfc_cancel_all(struct scsi_device * sdev,int type)2153 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2154 {
2155 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2156 struct scsi_target *starget = scsi_target(sdev);
2157 struct fc_rport *rport = starget_to_rport(starget);
2158 struct ibmvfc_tmf *tmf;
2159 struct ibmvfc_event *evt, *found_evt;
2160 union ibmvfc_iu rsp;
2161 int rsp_rc = -EBUSY;
2162 unsigned long flags;
2163 u16 status;
2164
2165 ENTER;
2166 spin_lock_irqsave(vhost->host->host_lock, flags);
2167 found_evt = NULL;
2168 list_for_each_entry(evt, &vhost->sent, queue) {
2169 if (evt->cmnd && evt->cmnd->device == sdev) {
2170 found_evt = evt;
2171 break;
2172 }
2173 }
2174
2175 if (!found_evt) {
2176 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2177 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2178 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2179 return 0;
2180 }
2181
2182 if (vhost->logged_in) {
2183 evt = ibmvfc_get_event(vhost);
2184 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2185
2186 tmf = &evt->iu.tmf;
2187 memset(tmf, 0, sizeof(*tmf));
2188 tmf->common.version = cpu_to_be32(1);
2189 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2190 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2191 tmf->scsi_id = cpu_to_be64(rport->port_id);
2192 int_to_scsilun(sdev->lun, &tmf->lun);
2193 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2194 type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2195 if (vhost->state == IBMVFC_ACTIVE)
2196 tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2197 else
2198 tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2199 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2200 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2201
2202 evt->sync_iu = &rsp;
2203 init_completion(&evt->comp);
2204 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2205 }
2206
2207 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2208
2209 if (rsp_rc != 0) {
2210 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2211 /* If failure is received, the host adapter is most likely going
2212 through reset, return success so the caller will wait for the command
2213 being cancelled to get returned */
2214 return 0;
2215 }
2216
2217 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2218
2219 wait_for_completion(&evt->comp);
2220 status = be16_to_cpu(rsp.mad_common.status);
2221 spin_lock_irqsave(vhost->host->host_lock, flags);
2222 ibmvfc_free_event(evt);
2223 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2224
2225 if (status != IBMVFC_MAD_SUCCESS) {
2226 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2227 switch (status) {
2228 case IBMVFC_MAD_DRIVER_FAILED:
2229 case IBMVFC_MAD_CRQ_ERROR:
2230 /* Host adapter most likely going through reset, return success to
2231 the caller will wait for the command being cancelled to get returned */
2232 return 0;
2233 default:
2234 return -EIO;
2235 };
2236 }
2237
2238 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2239 return 0;
2240 }
2241
2242 /**
2243 * ibmvfc_match_key - Match function for specified cancel key
2244 * @evt: ibmvfc event struct
2245 * @key: cancel key to match
2246 *
2247 * Returns:
2248 * 1 if event matches key / 0 if event does not match key
2249 **/
ibmvfc_match_key(struct ibmvfc_event * evt,void * key)2250 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2251 {
2252 unsigned long cancel_key = (unsigned long)key;
2253
2254 if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2255 be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2256 return 1;
2257 return 0;
2258 }
2259
2260 /**
2261 * ibmvfc_match_evt - Match function for specified event
2262 * @evt: ibmvfc event struct
2263 * @match: event to match
2264 *
2265 * Returns:
2266 * 1 if event matches key / 0 if event does not match key
2267 **/
ibmvfc_match_evt(struct ibmvfc_event * evt,void * match)2268 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2269 {
2270 if (evt == match)
2271 return 1;
2272 return 0;
2273 }
2274
2275 /**
2276 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2277 * @sdev: scsi device to abort commands
2278 *
2279 * This sends an Abort Task Set to the VIOS for the specified device. This does
2280 * NOT send any cancel to the VIOS. That must be done separately.
2281 *
2282 * Returns:
2283 * 0 on success / other on failure
2284 **/
ibmvfc_abort_task_set(struct scsi_device * sdev)2285 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2286 {
2287 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2288 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2289 struct ibmvfc_cmd *tmf;
2290 struct ibmvfc_event *evt, *found_evt;
2291 union ibmvfc_iu rsp_iu;
2292 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2293 int rc, rsp_rc = -EBUSY;
2294 unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2295 int rsp_code = 0;
2296
2297 spin_lock_irqsave(vhost->host->host_lock, flags);
2298 found_evt = NULL;
2299 list_for_each_entry(evt, &vhost->sent, queue) {
2300 if (evt->cmnd && evt->cmnd->device == sdev) {
2301 found_evt = evt;
2302 break;
2303 }
2304 }
2305
2306 if (!found_evt) {
2307 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2308 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2309 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2310 return 0;
2311 }
2312
2313 if (vhost->state == IBMVFC_ACTIVE) {
2314 evt = ibmvfc_get_event(vhost);
2315 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2316
2317 tmf = &evt->iu.cmd;
2318 memset(tmf, 0, sizeof(*tmf));
2319 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2320 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2321 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2322 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2323 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2324 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2325 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2326 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2327 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2328 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2329 evt->sync_iu = &rsp_iu;
2330
2331 init_completion(&evt->comp);
2332 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2333 }
2334
2335 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2336
2337 if (rsp_rc != 0) {
2338 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2339 return -EIO;
2340 }
2341
2342 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2343 timeout = wait_for_completion_timeout(&evt->comp, timeout);
2344
2345 if (!timeout) {
2346 rc = ibmvfc_cancel_all(sdev, 0);
2347 if (!rc) {
2348 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2349 if (rc == SUCCESS)
2350 rc = 0;
2351 }
2352
2353 if (rc) {
2354 sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2355 ibmvfc_reset_host(vhost);
2356 rsp_rc = -EIO;
2357 rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2358
2359 if (rc == SUCCESS)
2360 rsp_rc = 0;
2361
2362 rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2363 if (rc != SUCCESS) {
2364 spin_lock_irqsave(vhost->host->host_lock, flags);
2365 ibmvfc_hard_reset_host(vhost);
2366 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2367 rsp_rc = 0;
2368 }
2369
2370 goto out;
2371 }
2372 }
2373
2374 if (rsp_iu.cmd.status)
2375 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2376
2377 if (rsp_code) {
2378 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2379 rsp_code = fc_rsp->data.info.rsp_code;
2380
2381 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2382 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2383 ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2384 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2385 fc_rsp->scsi_status);
2386 rsp_rc = -EIO;
2387 } else
2388 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2389
2390 out:
2391 spin_lock_irqsave(vhost->host->host_lock, flags);
2392 ibmvfc_free_event(evt);
2393 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2394 return rsp_rc;
2395 }
2396
2397 /**
2398 * ibmvfc_eh_abort_handler - Abort a command
2399 * @cmd: scsi command to abort
2400 *
2401 * Returns:
2402 * SUCCESS / FAST_IO_FAIL / FAILED
2403 **/
ibmvfc_eh_abort_handler(struct scsi_cmnd * cmd)2404 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2405 {
2406 struct scsi_device *sdev = cmd->device;
2407 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2408 int cancel_rc, block_rc;
2409 int rc = FAILED;
2410
2411 ENTER;
2412 block_rc = fc_block_scsi_eh(cmd);
2413 ibmvfc_wait_while_resetting(vhost);
2414 if (block_rc != FAST_IO_FAIL) {
2415 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2416 ibmvfc_abort_task_set(sdev);
2417 } else
2418 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2419
2420 if (!cancel_rc)
2421 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2422
2423 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2424 rc = FAST_IO_FAIL;
2425
2426 LEAVE;
2427 return rc;
2428 }
2429
2430 /**
2431 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2432 * @cmd: scsi command struct
2433 *
2434 * Returns:
2435 * SUCCESS / FAST_IO_FAIL / FAILED
2436 **/
ibmvfc_eh_device_reset_handler(struct scsi_cmnd * cmd)2437 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2438 {
2439 struct scsi_device *sdev = cmd->device;
2440 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2441 int cancel_rc, block_rc, reset_rc = 0;
2442 int rc = FAILED;
2443
2444 ENTER;
2445 block_rc = fc_block_scsi_eh(cmd);
2446 ibmvfc_wait_while_resetting(vhost);
2447 if (block_rc != FAST_IO_FAIL) {
2448 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2449 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2450 } else
2451 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2452
2453 if (!cancel_rc && !reset_rc)
2454 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2455
2456 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2457 rc = FAST_IO_FAIL;
2458
2459 LEAVE;
2460 return rc;
2461 }
2462
2463 /**
2464 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2465 * @sdev: scsi device struct
2466 * @data: return code
2467 *
2468 **/
ibmvfc_dev_cancel_all_noreset(struct scsi_device * sdev,void * data)2469 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2470 {
2471 unsigned long *rc = data;
2472 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2473 }
2474
2475 /**
2476 * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2477 * @sdev: scsi device struct
2478 * @data: return code
2479 *
2480 **/
ibmvfc_dev_cancel_all_reset(struct scsi_device * sdev,void * data)2481 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2482 {
2483 unsigned long *rc = data;
2484 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2485 }
2486
2487 /**
2488 * ibmvfc_eh_target_reset_handler - Reset the target
2489 * @cmd: scsi command struct
2490 *
2491 * Returns:
2492 * SUCCESS / FAST_IO_FAIL / FAILED
2493 **/
ibmvfc_eh_target_reset_handler(struct scsi_cmnd * cmd)2494 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2495 {
2496 struct scsi_device *sdev = cmd->device;
2497 struct ibmvfc_host *vhost = shost_priv(sdev->host);
2498 struct scsi_target *starget = scsi_target(sdev);
2499 int block_rc;
2500 int reset_rc = 0;
2501 int rc = FAILED;
2502 unsigned long cancel_rc = 0;
2503
2504 ENTER;
2505 block_rc = fc_block_scsi_eh(cmd);
2506 ibmvfc_wait_while_resetting(vhost);
2507 if (block_rc != FAST_IO_FAIL) {
2508 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2509 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2510 } else
2511 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2512
2513 if (!cancel_rc && !reset_rc)
2514 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2515
2516 if (block_rc == FAST_IO_FAIL && rc != FAILED)
2517 rc = FAST_IO_FAIL;
2518
2519 LEAVE;
2520 return rc;
2521 }
2522
2523 /**
2524 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2525 * @cmd: struct scsi_cmnd having problems
2526 *
2527 **/
ibmvfc_eh_host_reset_handler(struct scsi_cmnd * cmd)2528 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2529 {
2530 int rc;
2531 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2532
2533 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2534 rc = ibmvfc_issue_fc_host_lip(vhost->host);
2535
2536 return rc ? FAILED : SUCCESS;
2537 }
2538
2539 /**
2540 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2541 * @rport: rport struct
2542 *
2543 * Return value:
2544 * none
2545 **/
ibmvfc_terminate_rport_io(struct fc_rport * rport)2546 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2547 {
2548 struct Scsi_Host *shost = rport_to_shost(rport);
2549 struct ibmvfc_host *vhost = shost_priv(shost);
2550 struct fc_rport *dev_rport;
2551 struct scsi_device *sdev;
2552 unsigned long rc;
2553
2554 ENTER;
2555 shost_for_each_device(sdev, shost) {
2556 dev_rport = starget_to_rport(scsi_target(sdev));
2557 if (dev_rport != rport)
2558 continue;
2559 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2560 }
2561
2562 rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2563
2564 if (rc == FAILED)
2565 ibmvfc_issue_fc_host_lip(shost);
2566 LEAVE;
2567 }
2568
2569 static const struct ibmvfc_async_desc ae_desc [] = {
2570 { "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2571 { "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2572 { "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2573 { "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2574 { "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2575 { "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL },
2576 { "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL },
2577 { "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL },
2578 { "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL },
2579 { "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL },
2580 { "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL },
2581 { "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL },
2582 { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2583 };
2584
2585 static const struct ibmvfc_async_desc unknown_ae = {
2586 "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2587 };
2588
2589 /**
2590 * ibmvfc_get_ae_desc - Get text description for async event
2591 * @ae: async event
2592 *
2593 **/
ibmvfc_get_ae_desc(u64 ae)2594 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2595 {
2596 int i;
2597
2598 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2599 if (ae_desc[i].ae == ae)
2600 return &ae_desc[i];
2601
2602 return &unknown_ae;
2603 }
2604
2605 static const struct {
2606 enum ibmvfc_ae_link_state state;
2607 const char *desc;
2608 } link_desc [] = {
2609 { IBMVFC_AE_LS_LINK_UP, " link up" },
2610 { IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" },
2611 { IBMVFC_AE_LS_LINK_DOWN, " link down" },
2612 { IBMVFC_AE_LS_LINK_DEAD, " link dead" },
2613 };
2614
2615 /**
2616 * ibmvfc_get_link_state - Get text description for link state
2617 * @state: link state
2618 *
2619 **/
ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)2620 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2621 {
2622 int i;
2623
2624 for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2625 if (link_desc[i].state == state)
2626 return link_desc[i].desc;
2627
2628 return "";
2629 }
2630
2631 /**
2632 * ibmvfc_handle_async - Handle an async event from the adapter
2633 * @crq: crq to process
2634 * @vhost: ibmvfc host struct
2635 *
2636 **/
ibmvfc_handle_async(struct ibmvfc_async_crq * crq,struct ibmvfc_host * vhost)2637 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2638 struct ibmvfc_host *vhost)
2639 {
2640 const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2641 struct ibmvfc_target *tgt;
2642
2643 ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2644 " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
2645 be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
2646 ibmvfc_get_link_state(crq->link_state));
2647
2648 switch (be64_to_cpu(crq->event)) {
2649 case IBMVFC_AE_RESUME:
2650 switch (crq->link_state) {
2651 case IBMVFC_AE_LS_LINK_DOWN:
2652 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2653 break;
2654 case IBMVFC_AE_LS_LINK_DEAD:
2655 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2656 break;
2657 case IBMVFC_AE_LS_LINK_UP:
2658 case IBMVFC_AE_LS_LINK_BOUNCED:
2659 default:
2660 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2661 vhost->delay_init = 1;
2662 __ibmvfc_reset_host(vhost);
2663 break;
2664 }
2665
2666 break;
2667 case IBMVFC_AE_LINK_UP:
2668 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2669 vhost->delay_init = 1;
2670 __ibmvfc_reset_host(vhost);
2671 break;
2672 case IBMVFC_AE_SCN_FABRIC:
2673 case IBMVFC_AE_SCN_DOMAIN:
2674 vhost->events_to_log |= IBMVFC_AE_RSCN;
2675 if (vhost->state < IBMVFC_HALTED) {
2676 vhost->delay_init = 1;
2677 __ibmvfc_reset_host(vhost);
2678 }
2679 break;
2680 case IBMVFC_AE_SCN_NPORT:
2681 case IBMVFC_AE_SCN_GROUP:
2682 vhost->events_to_log |= IBMVFC_AE_RSCN;
2683 ibmvfc_reinit_host(vhost);
2684 break;
2685 case IBMVFC_AE_ELS_LOGO:
2686 case IBMVFC_AE_ELS_PRLO:
2687 case IBMVFC_AE_ELS_PLOGI:
2688 list_for_each_entry(tgt, &vhost->targets, queue) {
2689 if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2690 break;
2691 if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2692 continue;
2693 if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2694 continue;
2695 if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2696 continue;
2697 if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2698 tgt->logo_rcvd = 1;
2699 if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2700 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2701 ibmvfc_reinit_host(vhost);
2702 }
2703 }
2704 break;
2705 case IBMVFC_AE_LINK_DOWN:
2706 case IBMVFC_AE_ADAPTER_FAILED:
2707 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2708 break;
2709 case IBMVFC_AE_LINK_DEAD:
2710 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2711 break;
2712 case IBMVFC_AE_HALT:
2713 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2714 break;
2715 default:
2716 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2717 break;
2718 }
2719 }
2720
2721 /**
2722 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2723 * @crq: Command/Response queue
2724 * @vhost: ibmvfc host struct
2725 *
2726 **/
ibmvfc_handle_crq(struct ibmvfc_crq * crq,struct ibmvfc_host * vhost)2727 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2728 {
2729 long rc;
2730 struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2731
2732 switch (crq->valid) {
2733 case IBMVFC_CRQ_INIT_RSP:
2734 switch (crq->format) {
2735 case IBMVFC_CRQ_INIT:
2736 dev_info(vhost->dev, "Partner initialized\n");
2737 /* Send back a response */
2738 rc = ibmvfc_send_crq_init_complete(vhost);
2739 if (rc == 0)
2740 ibmvfc_init_host(vhost);
2741 else
2742 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2743 break;
2744 case IBMVFC_CRQ_INIT_COMPLETE:
2745 dev_info(vhost->dev, "Partner initialization complete\n");
2746 ibmvfc_init_host(vhost);
2747 break;
2748 default:
2749 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2750 }
2751 return;
2752 case IBMVFC_CRQ_XPORT_EVENT:
2753 vhost->state = IBMVFC_NO_CRQ;
2754 vhost->logged_in = 0;
2755 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2756 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2757 /* We need to re-setup the interpartition connection */
2758 dev_info(vhost->dev, "Re-enabling adapter\n");
2759 vhost->client_migrated = 1;
2760 ibmvfc_purge_requests(vhost, DID_REQUEUE);
2761 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2762 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2763 } else {
2764 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2765 ibmvfc_purge_requests(vhost, DID_ERROR);
2766 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2767 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2768 }
2769 return;
2770 case IBMVFC_CRQ_CMD_RSP:
2771 break;
2772 default:
2773 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2774 return;
2775 }
2776
2777 if (crq->format == IBMVFC_ASYNC_EVENT)
2778 return;
2779
2780 /* The only kind of payload CRQs we should get are responses to
2781 * things we send. Make sure this response is to something we
2782 * actually sent
2783 */
2784 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2785 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2786 crq->ioba);
2787 return;
2788 }
2789
2790 if (unlikely(atomic_read(&evt->free))) {
2791 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2792 crq->ioba);
2793 return;
2794 }
2795
2796 del_timer(&evt->timer);
2797 list_del(&evt->queue);
2798 ibmvfc_trc_end(evt);
2799 evt->done(evt);
2800 }
2801
2802 /**
2803 * ibmvfc_scan_finished - Check if the device scan is done.
2804 * @shost: scsi host struct
2805 * @time: current elapsed time
2806 *
2807 * Returns:
2808 * 0 if scan is not done / 1 if scan is done
2809 **/
ibmvfc_scan_finished(struct Scsi_Host * shost,unsigned long time)2810 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2811 {
2812 unsigned long flags;
2813 struct ibmvfc_host *vhost = shost_priv(shost);
2814 int done = 0;
2815
2816 spin_lock_irqsave(shost->host_lock, flags);
2817 if (time >= (init_timeout * HZ)) {
2818 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2819 "continuing initialization\n", init_timeout);
2820 done = 1;
2821 }
2822
2823 if (vhost->scan_complete)
2824 done = 1;
2825 spin_unlock_irqrestore(shost->host_lock, flags);
2826 return done;
2827 }
2828
2829 /**
2830 * ibmvfc_slave_alloc - Setup the device's task set value
2831 * @sdev: struct scsi_device device to configure
2832 *
2833 * Set the device's task set value so that error handling works as
2834 * expected.
2835 *
2836 * Returns:
2837 * 0 on success / -ENXIO if device does not exist
2838 **/
ibmvfc_slave_alloc(struct scsi_device * sdev)2839 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2840 {
2841 struct Scsi_Host *shost = sdev->host;
2842 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2843 struct ibmvfc_host *vhost = shost_priv(shost);
2844 unsigned long flags = 0;
2845
2846 if (!rport || fc_remote_port_chkready(rport))
2847 return -ENXIO;
2848
2849 spin_lock_irqsave(shost->host_lock, flags);
2850 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2851 spin_unlock_irqrestore(shost->host_lock, flags);
2852 return 0;
2853 }
2854
2855 /**
2856 * ibmvfc_target_alloc - Setup the target's task set value
2857 * @starget: struct scsi_target
2858 *
2859 * Set the target's task set value so that error handling works as
2860 * expected.
2861 *
2862 * Returns:
2863 * 0 on success / -ENXIO if device does not exist
2864 **/
ibmvfc_target_alloc(struct scsi_target * starget)2865 static int ibmvfc_target_alloc(struct scsi_target *starget)
2866 {
2867 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2868 struct ibmvfc_host *vhost = shost_priv(shost);
2869 unsigned long flags = 0;
2870
2871 spin_lock_irqsave(shost->host_lock, flags);
2872 starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2873 spin_unlock_irqrestore(shost->host_lock, flags);
2874 return 0;
2875 }
2876
2877 /**
2878 * ibmvfc_slave_configure - Configure the device
2879 * @sdev: struct scsi_device device to configure
2880 *
2881 * Enable allow_restart for a device if it is a disk. Adjust the
2882 * queue_depth here also.
2883 *
2884 * Returns:
2885 * 0
2886 **/
ibmvfc_slave_configure(struct scsi_device * sdev)2887 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2888 {
2889 struct Scsi_Host *shost = sdev->host;
2890 unsigned long flags = 0;
2891
2892 spin_lock_irqsave(shost->host_lock, flags);
2893 if (sdev->type == TYPE_DISK)
2894 sdev->allow_restart = 1;
2895 spin_unlock_irqrestore(shost->host_lock, flags);
2896 return 0;
2897 }
2898
2899 /**
2900 * ibmvfc_change_queue_depth - Change the device's queue depth
2901 * @sdev: scsi device struct
2902 * @qdepth: depth to set
2903 * @reason: calling context
2904 *
2905 * Return value:
2906 * actual depth set
2907 **/
ibmvfc_change_queue_depth(struct scsi_device * sdev,int qdepth)2908 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2909 {
2910 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2911 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2912
2913 return scsi_change_queue_depth(sdev, qdepth);
2914 }
2915
ibmvfc_show_host_partition_name(struct device * dev,struct device_attribute * attr,char * buf)2916 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2917 struct device_attribute *attr, char *buf)
2918 {
2919 struct Scsi_Host *shost = class_to_shost(dev);
2920 struct ibmvfc_host *vhost = shost_priv(shost);
2921
2922 return snprintf(buf, PAGE_SIZE, "%s\n",
2923 vhost->login_buf->resp.partition_name);
2924 }
2925
ibmvfc_show_host_device_name(struct device * dev,struct device_attribute * attr,char * buf)2926 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2927 struct device_attribute *attr, char *buf)
2928 {
2929 struct Scsi_Host *shost = class_to_shost(dev);
2930 struct ibmvfc_host *vhost = shost_priv(shost);
2931
2932 return snprintf(buf, PAGE_SIZE, "%s\n",
2933 vhost->login_buf->resp.device_name);
2934 }
2935
ibmvfc_show_host_loc_code(struct device * dev,struct device_attribute * attr,char * buf)2936 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2937 struct device_attribute *attr, char *buf)
2938 {
2939 struct Scsi_Host *shost = class_to_shost(dev);
2940 struct ibmvfc_host *vhost = shost_priv(shost);
2941
2942 return snprintf(buf, PAGE_SIZE, "%s\n",
2943 vhost->login_buf->resp.port_loc_code);
2944 }
2945
ibmvfc_show_host_drc_name(struct device * dev,struct device_attribute * attr,char * buf)2946 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2947 struct device_attribute *attr, char *buf)
2948 {
2949 struct Scsi_Host *shost = class_to_shost(dev);
2950 struct ibmvfc_host *vhost = shost_priv(shost);
2951
2952 return snprintf(buf, PAGE_SIZE, "%s\n",
2953 vhost->login_buf->resp.drc_name);
2954 }
2955
ibmvfc_show_host_npiv_version(struct device * dev,struct device_attribute * attr,char * buf)2956 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2957 struct device_attribute *attr, char *buf)
2958 {
2959 struct Scsi_Host *shost = class_to_shost(dev);
2960 struct ibmvfc_host *vhost = shost_priv(shost);
2961 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2962 }
2963
ibmvfc_show_host_capabilities(struct device * dev,struct device_attribute * attr,char * buf)2964 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2965 struct device_attribute *attr, char *buf)
2966 {
2967 struct Scsi_Host *shost = class_to_shost(dev);
2968 struct ibmvfc_host *vhost = shost_priv(shost);
2969 return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2970 }
2971
2972 /**
2973 * ibmvfc_show_log_level - Show the adapter's error logging level
2974 * @dev: class device struct
2975 * @buf: buffer
2976 *
2977 * Return value:
2978 * number of bytes printed to buffer
2979 **/
ibmvfc_show_log_level(struct device * dev,struct device_attribute * attr,char * buf)2980 static ssize_t ibmvfc_show_log_level(struct device *dev,
2981 struct device_attribute *attr, char *buf)
2982 {
2983 struct Scsi_Host *shost = class_to_shost(dev);
2984 struct ibmvfc_host *vhost = shost_priv(shost);
2985 unsigned long flags = 0;
2986 int len;
2987
2988 spin_lock_irqsave(shost->host_lock, flags);
2989 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2990 spin_unlock_irqrestore(shost->host_lock, flags);
2991 return len;
2992 }
2993
2994 /**
2995 * ibmvfc_store_log_level - Change the adapter's error logging level
2996 * @dev: class device struct
2997 * @buf: buffer
2998 *
2999 * Return value:
3000 * number of bytes printed to buffer
3001 **/
ibmvfc_store_log_level(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)3002 static ssize_t ibmvfc_store_log_level(struct device *dev,
3003 struct device_attribute *attr,
3004 const char *buf, size_t count)
3005 {
3006 struct Scsi_Host *shost = class_to_shost(dev);
3007 struct ibmvfc_host *vhost = shost_priv(shost);
3008 unsigned long flags = 0;
3009
3010 spin_lock_irqsave(shost->host_lock, flags);
3011 vhost->log_level = simple_strtoul(buf, NULL, 10);
3012 spin_unlock_irqrestore(shost->host_lock, flags);
3013 return strlen(buf);
3014 }
3015
3016 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3017 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3018 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3019 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3020 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3021 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3022 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3023 ibmvfc_show_log_level, ibmvfc_store_log_level);
3024
3025 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3026 /**
3027 * ibmvfc_read_trace - Dump the adapter trace
3028 * @filp: open sysfs file
3029 * @kobj: kobject struct
3030 * @bin_attr: bin_attribute struct
3031 * @buf: buffer
3032 * @off: offset
3033 * @count: buffer size
3034 *
3035 * Return value:
3036 * number of bytes printed to buffer
3037 **/
ibmvfc_read_trace(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)3038 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3039 struct bin_attribute *bin_attr,
3040 char *buf, loff_t off, size_t count)
3041 {
3042 struct device *dev = container_of(kobj, struct device, kobj);
3043 struct Scsi_Host *shost = class_to_shost(dev);
3044 struct ibmvfc_host *vhost = shost_priv(shost);
3045 unsigned long flags = 0;
3046 int size = IBMVFC_TRACE_SIZE;
3047 char *src = (char *)vhost->trace;
3048
3049 if (off > size)
3050 return 0;
3051 if (off + count > size) {
3052 size -= off;
3053 count = size;
3054 }
3055
3056 spin_lock_irqsave(shost->host_lock, flags);
3057 memcpy(buf, &src[off], count);
3058 spin_unlock_irqrestore(shost->host_lock, flags);
3059 return count;
3060 }
3061
3062 static struct bin_attribute ibmvfc_trace_attr = {
3063 .attr = {
3064 .name = "trace",
3065 .mode = S_IRUGO,
3066 },
3067 .size = 0,
3068 .read = ibmvfc_read_trace,
3069 };
3070 #endif
3071
3072 static struct device_attribute *ibmvfc_attrs[] = {
3073 &dev_attr_partition_name,
3074 &dev_attr_device_name,
3075 &dev_attr_port_loc_code,
3076 &dev_attr_drc_name,
3077 &dev_attr_npiv_version,
3078 &dev_attr_capabilities,
3079 &dev_attr_log_level,
3080 NULL
3081 };
3082
3083 static struct scsi_host_template driver_template = {
3084 .module = THIS_MODULE,
3085 .name = "IBM POWER Virtual FC Adapter",
3086 .proc_name = IBMVFC_NAME,
3087 .queuecommand = ibmvfc_queuecommand,
3088 .eh_timed_out = fc_eh_timed_out,
3089 .eh_abort_handler = ibmvfc_eh_abort_handler,
3090 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3091 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3092 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3093 .slave_alloc = ibmvfc_slave_alloc,
3094 .slave_configure = ibmvfc_slave_configure,
3095 .target_alloc = ibmvfc_target_alloc,
3096 .scan_finished = ibmvfc_scan_finished,
3097 .change_queue_depth = ibmvfc_change_queue_depth,
3098 .cmd_per_lun = 16,
3099 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3100 .this_id = -1,
3101 .sg_tablesize = SG_ALL,
3102 .max_sectors = IBMVFC_MAX_SECTORS,
3103 .use_clustering = ENABLE_CLUSTERING,
3104 .shost_attrs = ibmvfc_attrs,
3105 .track_queue_depth = 1,
3106 };
3107
3108 /**
3109 * ibmvfc_next_async_crq - Returns the next entry in async queue
3110 * @vhost: ibmvfc host struct
3111 *
3112 * Returns:
3113 * Pointer to next entry in queue / NULL if empty
3114 **/
ibmvfc_next_async_crq(struct ibmvfc_host * vhost)3115 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3116 {
3117 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3118 struct ibmvfc_async_crq *crq;
3119
3120 crq = &async_crq->msgs[async_crq->cur];
3121 if (crq->valid & 0x80) {
3122 if (++async_crq->cur == async_crq->size)
3123 async_crq->cur = 0;
3124 rmb();
3125 } else
3126 crq = NULL;
3127
3128 return crq;
3129 }
3130
3131 /**
3132 * ibmvfc_next_crq - Returns the next entry in message queue
3133 * @vhost: ibmvfc host struct
3134 *
3135 * Returns:
3136 * Pointer to next entry in queue / NULL if empty
3137 **/
ibmvfc_next_crq(struct ibmvfc_host * vhost)3138 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3139 {
3140 struct ibmvfc_crq_queue *queue = &vhost->crq;
3141 struct ibmvfc_crq *crq;
3142
3143 crq = &queue->msgs[queue->cur];
3144 if (crq->valid & 0x80) {
3145 if (++queue->cur == queue->size)
3146 queue->cur = 0;
3147 rmb();
3148 } else
3149 crq = NULL;
3150
3151 return crq;
3152 }
3153
3154 /**
3155 * ibmvfc_interrupt - Interrupt handler
3156 * @irq: number of irq to handle, not used
3157 * @dev_instance: ibmvfc_host that received interrupt
3158 *
3159 * Returns:
3160 * IRQ_HANDLED
3161 **/
ibmvfc_interrupt(int irq,void * dev_instance)3162 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3163 {
3164 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3165 unsigned long flags;
3166
3167 spin_lock_irqsave(vhost->host->host_lock, flags);
3168 vio_disable_interrupts(to_vio_dev(vhost->dev));
3169 tasklet_schedule(&vhost->tasklet);
3170 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3171 return IRQ_HANDLED;
3172 }
3173
3174 /**
3175 * ibmvfc_tasklet - Interrupt handler tasklet
3176 * @data: ibmvfc host struct
3177 *
3178 * Returns:
3179 * Nothing
3180 **/
ibmvfc_tasklet(void * data)3181 static void ibmvfc_tasklet(void *data)
3182 {
3183 struct ibmvfc_host *vhost = data;
3184 struct vio_dev *vdev = to_vio_dev(vhost->dev);
3185 struct ibmvfc_crq *crq;
3186 struct ibmvfc_async_crq *async;
3187 unsigned long flags;
3188 int done = 0;
3189
3190 spin_lock_irqsave(vhost->host->host_lock, flags);
3191 while (!done) {
3192 /* Pull all the valid messages off the async CRQ */
3193 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3194 ibmvfc_handle_async(async, vhost);
3195 async->valid = 0;
3196 wmb();
3197 }
3198
3199 /* Pull all the valid messages off the CRQ */
3200 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3201 ibmvfc_handle_crq(crq, vhost);
3202 crq->valid = 0;
3203 wmb();
3204 }
3205
3206 vio_enable_interrupts(vdev);
3207 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3208 vio_disable_interrupts(vdev);
3209 ibmvfc_handle_async(async, vhost);
3210 async->valid = 0;
3211 wmb();
3212 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3213 vio_disable_interrupts(vdev);
3214 ibmvfc_handle_crq(crq, vhost);
3215 crq->valid = 0;
3216 wmb();
3217 } else
3218 done = 1;
3219 }
3220
3221 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3222 }
3223
3224 /**
3225 * ibmvfc_init_tgt - Set the next init job step for the target
3226 * @tgt: ibmvfc target struct
3227 * @job_step: job step to perform
3228 *
3229 **/
ibmvfc_init_tgt(struct ibmvfc_target * tgt,void (* job_step)(struct ibmvfc_target *))3230 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3231 void (*job_step) (struct ibmvfc_target *))
3232 {
3233 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3234 tgt->job_step = job_step;
3235 wake_up(&tgt->vhost->work_wait_q);
3236 }
3237
3238 /**
3239 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3240 * @tgt: ibmvfc target struct
3241 * @job_step: initialization job step
3242 *
3243 * Returns: 1 if step will be retried / 0 if not
3244 *
3245 **/
ibmvfc_retry_tgt_init(struct ibmvfc_target * tgt,void (* job_step)(struct ibmvfc_target *))3246 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3247 void (*job_step) (struct ibmvfc_target *))
3248 {
3249 if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3250 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3251 wake_up(&tgt->vhost->work_wait_q);
3252 return 0;
3253 } else
3254 ibmvfc_init_tgt(tgt, job_step);
3255 return 1;
3256 }
3257
3258 /* Defined in FC-LS */
3259 static const struct {
3260 int code;
3261 int retry;
3262 int logged_in;
3263 } prli_rsp [] = {
3264 { 0, 1, 0 },
3265 { 1, 0, 1 },
3266 { 2, 1, 0 },
3267 { 3, 1, 0 },
3268 { 4, 0, 0 },
3269 { 5, 0, 0 },
3270 { 6, 0, 1 },
3271 { 7, 0, 0 },
3272 { 8, 1, 0 },
3273 };
3274
3275 /**
3276 * ibmvfc_get_prli_rsp - Find PRLI response index
3277 * @flags: PRLI response flags
3278 *
3279 **/
ibmvfc_get_prli_rsp(u16 flags)3280 static int ibmvfc_get_prli_rsp(u16 flags)
3281 {
3282 int i;
3283 int code = (flags & 0x0f00) >> 8;
3284
3285 for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3286 if (prli_rsp[i].code == code)
3287 return i;
3288
3289 return 0;
3290 }
3291
3292 /**
3293 * ibmvfc_tgt_prli_done - Completion handler for Process Login
3294 * @evt: ibmvfc event struct
3295 *
3296 **/
ibmvfc_tgt_prli_done(struct ibmvfc_event * evt)3297 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3298 {
3299 struct ibmvfc_target *tgt = evt->tgt;
3300 struct ibmvfc_host *vhost = evt->vhost;
3301 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3302 struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3303 u32 status = be16_to_cpu(rsp->common.status);
3304 int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3305
3306 vhost->discovery_threads--;
3307 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3308 switch (status) {
3309 case IBMVFC_MAD_SUCCESS:
3310 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3311 parms->type, parms->flags, parms->service_parms);
3312
3313 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3314 index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3315 if (prli_rsp[index].logged_in) {
3316 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3317 tgt->need_login = 0;
3318 tgt->ids.roles = 0;
3319 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3320 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3321 if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3322 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3323 tgt->add_rport = 1;
3324 } else
3325 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3326 } else if (prli_rsp[index].retry)
3327 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3328 else
3329 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3330 } else
3331 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3332 break;
3333 case IBMVFC_MAD_DRIVER_FAILED:
3334 break;
3335 case IBMVFC_MAD_CRQ_ERROR:
3336 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3337 break;
3338 case IBMVFC_MAD_FAILED:
3339 default:
3340 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3341 be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3342 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3343 else if (tgt->logo_rcvd)
3344 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3345 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3346 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3347 else
3348 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3349
3350 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3351 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3352 rsp->status, rsp->error, status);
3353 break;
3354 }
3355
3356 kref_put(&tgt->kref, ibmvfc_release_tgt);
3357 ibmvfc_free_event(evt);
3358 wake_up(&vhost->work_wait_q);
3359 }
3360
3361 /**
3362 * ibmvfc_tgt_send_prli - Send a process login
3363 * @tgt: ibmvfc target struct
3364 *
3365 **/
ibmvfc_tgt_send_prli(struct ibmvfc_target * tgt)3366 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3367 {
3368 struct ibmvfc_process_login *prli;
3369 struct ibmvfc_host *vhost = tgt->vhost;
3370 struct ibmvfc_event *evt;
3371
3372 if (vhost->discovery_threads >= disc_threads)
3373 return;
3374
3375 kref_get(&tgt->kref);
3376 evt = ibmvfc_get_event(vhost);
3377 vhost->discovery_threads++;
3378 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3379 evt->tgt = tgt;
3380 prli = &evt->iu.prli;
3381 memset(prli, 0, sizeof(*prli));
3382 prli->common.version = cpu_to_be32(1);
3383 prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3384 prli->common.length = cpu_to_be16(sizeof(*prli));
3385 prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3386
3387 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3388 prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3389 prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3390 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
3391
3392 if (cls3_error)
3393 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
3394
3395 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3396 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3397 vhost->discovery_threads--;
3398 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3399 kref_put(&tgt->kref, ibmvfc_release_tgt);
3400 } else
3401 tgt_dbg(tgt, "Sent process login\n");
3402 }
3403
3404 /**
3405 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3406 * @evt: ibmvfc event struct
3407 *
3408 **/
ibmvfc_tgt_plogi_done(struct ibmvfc_event * evt)3409 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3410 {
3411 struct ibmvfc_target *tgt = evt->tgt;
3412 struct ibmvfc_host *vhost = evt->vhost;
3413 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3414 u32 status = be16_to_cpu(rsp->common.status);
3415 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3416
3417 vhost->discovery_threads--;
3418 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3419 switch (status) {
3420 case IBMVFC_MAD_SUCCESS:
3421 tgt_dbg(tgt, "Port Login succeeded\n");
3422 if (tgt->ids.port_name &&
3423 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3424 vhost->reinit = 1;
3425 tgt_dbg(tgt, "Port re-init required\n");
3426 break;
3427 }
3428 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3429 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3430 tgt->ids.port_id = tgt->scsi_id;
3431 memcpy(&tgt->service_parms, &rsp->service_parms,
3432 sizeof(tgt->service_parms));
3433 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3434 sizeof(tgt->service_parms_change));
3435 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3436 break;
3437 case IBMVFC_MAD_DRIVER_FAILED:
3438 break;
3439 case IBMVFC_MAD_CRQ_ERROR:
3440 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3441 break;
3442 case IBMVFC_MAD_FAILED:
3443 default:
3444 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3445 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3446 else
3447 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3448
3449 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3450 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3451 ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3452 ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3453 break;
3454 }
3455
3456 kref_put(&tgt->kref, ibmvfc_release_tgt);
3457 ibmvfc_free_event(evt);
3458 wake_up(&vhost->work_wait_q);
3459 }
3460
3461 /**
3462 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3463 * @tgt: ibmvfc target struct
3464 *
3465 **/
ibmvfc_tgt_send_plogi(struct ibmvfc_target * tgt)3466 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3467 {
3468 struct ibmvfc_port_login *plogi;
3469 struct ibmvfc_host *vhost = tgt->vhost;
3470 struct ibmvfc_event *evt;
3471
3472 if (vhost->discovery_threads >= disc_threads)
3473 return;
3474
3475 kref_get(&tgt->kref);
3476 tgt->logo_rcvd = 0;
3477 evt = ibmvfc_get_event(vhost);
3478 vhost->discovery_threads++;
3479 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3480 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3481 evt->tgt = tgt;
3482 plogi = &evt->iu.plogi;
3483 memset(plogi, 0, sizeof(*plogi));
3484 plogi->common.version = cpu_to_be32(1);
3485 plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3486 plogi->common.length = cpu_to_be16(sizeof(*plogi));
3487 plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3488
3489 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3490 vhost->discovery_threads--;
3491 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3492 kref_put(&tgt->kref, ibmvfc_release_tgt);
3493 } else
3494 tgt_dbg(tgt, "Sent port login\n");
3495 }
3496
3497 /**
3498 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3499 * @evt: ibmvfc event struct
3500 *
3501 **/
ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event * evt)3502 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3503 {
3504 struct ibmvfc_target *tgt = evt->tgt;
3505 struct ibmvfc_host *vhost = evt->vhost;
3506 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3507 u32 status = be16_to_cpu(rsp->common.status);
3508
3509 vhost->discovery_threads--;
3510 ibmvfc_free_event(evt);
3511 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3512
3513 switch (status) {
3514 case IBMVFC_MAD_SUCCESS:
3515 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3516 break;
3517 case IBMVFC_MAD_DRIVER_FAILED:
3518 kref_put(&tgt->kref, ibmvfc_release_tgt);
3519 wake_up(&vhost->work_wait_q);
3520 return;
3521 case IBMVFC_MAD_FAILED:
3522 default:
3523 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3524 break;
3525 }
3526
3527 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3528 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3529 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3530 tgt->scsi_id != tgt->new_scsi_id)
3531 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3532 kref_put(&tgt->kref, ibmvfc_release_tgt);
3533 wake_up(&vhost->work_wait_q);
3534 }
3535
3536 /**
3537 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3538 * @tgt: ibmvfc target struct
3539 *
3540 **/
ibmvfc_tgt_implicit_logout(struct ibmvfc_target * tgt)3541 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3542 {
3543 struct ibmvfc_implicit_logout *mad;
3544 struct ibmvfc_host *vhost = tgt->vhost;
3545 struct ibmvfc_event *evt;
3546
3547 if (vhost->discovery_threads >= disc_threads)
3548 return;
3549
3550 kref_get(&tgt->kref);
3551 evt = ibmvfc_get_event(vhost);
3552 vhost->discovery_threads++;
3553 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3554 evt->tgt = tgt;
3555 mad = &evt->iu.implicit_logout;
3556 memset(mad, 0, sizeof(*mad));
3557 mad->common.version = cpu_to_be32(1);
3558 mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3559 mad->common.length = cpu_to_be16(sizeof(*mad));
3560 mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3561
3562 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3563 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3564 vhost->discovery_threads--;
3565 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3566 kref_put(&tgt->kref, ibmvfc_release_tgt);
3567 } else
3568 tgt_dbg(tgt, "Sent Implicit Logout\n");
3569 }
3570
3571 /**
3572 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3573 * @mad: ibmvfc passthru mad struct
3574 * @tgt: ibmvfc target struct
3575 *
3576 * Returns:
3577 * 1 if PLOGI needed / 0 if PLOGI not needed
3578 **/
ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad * mad,struct ibmvfc_target * tgt)3579 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3580 struct ibmvfc_target *tgt)
3581 {
3582 if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
3583 return 1;
3584 if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
3585 return 1;
3586 if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3587 return 1;
3588 return 0;
3589 }
3590
3591 /**
3592 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3593 * @evt: ibmvfc event struct
3594 *
3595 **/
ibmvfc_tgt_adisc_done(struct ibmvfc_event * evt)3596 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3597 {
3598 struct ibmvfc_target *tgt = evt->tgt;
3599 struct ibmvfc_host *vhost = evt->vhost;
3600 struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3601 u32 status = be16_to_cpu(mad->common.status);
3602 u8 fc_reason, fc_explain;
3603
3604 vhost->discovery_threads--;
3605 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3606 del_timer(&tgt->timer);
3607
3608 switch (status) {
3609 case IBMVFC_MAD_SUCCESS:
3610 tgt_dbg(tgt, "ADISC succeeded\n");
3611 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3612 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3613 break;
3614 case IBMVFC_MAD_DRIVER_FAILED:
3615 break;
3616 case IBMVFC_MAD_FAILED:
3617 default:
3618 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3619 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3620 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3621 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3622 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3623 mad->iu.status, mad->iu.error,
3624 ibmvfc_get_fc_type(fc_reason), fc_reason,
3625 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3626 break;
3627 }
3628
3629 kref_put(&tgt->kref, ibmvfc_release_tgt);
3630 ibmvfc_free_event(evt);
3631 wake_up(&vhost->work_wait_q);
3632 }
3633
3634 /**
3635 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3636 * @evt: ibmvfc event struct
3637 *
3638 **/
ibmvfc_init_passthru(struct ibmvfc_event * evt)3639 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3640 {
3641 struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3642
3643 memset(mad, 0, sizeof(*mad));
3644 mad->common.version = cpu_to_be32(1);
3645 mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3646 mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3647 mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3648 offsetof(struct ibmvfc_passthru_mad, iu));
3649 mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3650 mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3651 mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3652 mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3653 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3654 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3655 mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3656 mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3657 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3658 offsetof(struct ibmvfc_passthru_fc_iu, response));
3659 mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3660 }
3661
3662 /**
3663 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3664 * @evt: ibmvfc event struct
3665 *
3666 * Just cleanup this event struct. Everything else is handled by
3667 * the ADISC completion handler. If the ADISC never actually comes
3668 * back, we still have the timer running on the ADISC event struct
3669 * which will fire and cause the CRQ to get reset.
3670 *
3671 **/
ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event * evt)3672 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3673 {
3674 struct ibmvfc_host *vhost = evt->vhost;
3675 struct ibmvfc_target *tgt = evt->tgt;
3676
3677 tgt_dbg(tgt, "ADISC cancel complete\n");
3678 vhost->abort_threads--;
3679 ibmvfc_free_event(evt);
3680 kref_put(&tgt->kref, ibmvfc_release_tgt);
3681 wake_up(&vhost->work_wait_q);
3682 }
3683
3684 /**
3685 * ibmvfc_adisc_timeout - Handle an ADISC timeout
3686 * @tgt: ibmvfc target struct
3687 *
3688 * If an ADISC times out, send a cancel. If the cancel times
3689 * out, reset the CRQ. When the ADISC comes back as cancelled,
3690 * log back into the target.
3691 **/
ibmvfc_adisc_timeout(struct timer_list * t)3692 static void ibmvfc_adisc_timeout(struct timer_list *t)
3693 {
3694 struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
3695 struct ibmvfc_host *vhost = tgt->vhost;
3696 struct ibmvfc_event *evt;
3697 struct ibmvfc_tmf *tmf;
3698 unsigned long flags;
3699 int rc;
3700
3701 tgt_dbg(tgt, "ADISC timeout\n");
3702 spin_lock_irqsave(vhost->host->host_lock, flags);
3703 if (vhost->abort_threads >= disc_threads ||
3704 tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3705 vhost->state != IBMVFC_INITIALIZING ||
3706 vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3707 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3708 return;
3709 }
3710
3711 vhost->abort_threads++;
3712 kref_get(&tgt->kref);
3713 evt = ibmvfc_get_event(vhost);
3714 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3715
3716 evt->tgt = tgt;
3717 tmf = &evt->iu.tmf;
3718 memset(tmf, 0, sizeof(*tmf));
3719 tmf->common.version = cpu_to_be32(1);
3720 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3721 tmf->common.length = cpu_to_be16(sizeof(*tmf));
3722 tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3723 tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3724
3725 rc = ibmvfc_send_event(evt, vhost, default_timeout);
3726
3727 if (rc) {
3728 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3729 vhost->abort_threads--;
3730 kref_put(&tgt->kref, ibmvfc_release_tgt);
3731 __ibmvfc_reset_host(vhost);
3732 } else
3733 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3734 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3735 }
3736
3737 /**
3738 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3739 * @tgt: ibmvfc target struct
3740 *
3741 * When sending an ADISC we end up with two timers running. The
3742 * first timer is the timer in the ibmvfc target struct. If this
3743 * fires, we send a cancel to the target. The second timer is the
3744 * timer on the ibmvfc event for the ADISC, which is longer. If that
3745 * fires, it means the ADISC timed out and our attempt to cancel it
3746 * also failed, so we need to reset the CRQ.
3747 **/
ibmvfc_tgt_adisc(struct ibmvfc_target * tgt)3748 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3749 {
3750 struct ibmvfc_passthru_mad *mad;
3751 struct ibmvfc_host *vhost = tgt->vhost;
3752 struct ibmvfc_event *evt;
3753
3754 if (vhost->discovery_threads >= disc_threads)
3755 return;
3756
3757 kref_get(&tgt->kref);
3758 evt = ibmvfc_get_event(vhost);
3759 vhost->discovery_threads++;
3760 ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3761 evt->tgt = tgt;
3762
3763 ibmvfc_init_passthru(evt);
3764 mad = &evt->iu.passthru;
3765 mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3766 mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3767 mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3768
3769 mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3770 memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3771 sizeof(vhost->login_buf->resp.port_name));
3772 memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3773 sizeof(vhost->login_buf->resp.node_name));
3774 mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3775
3776 if (timer_pending(&tgt->timer))
3777 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3778 else {
3779 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3780 add_timer(&tgt->timer);
3781 }
3782
3783 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3784 if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3785 vhost->discovery_threads--;
3786 del_timer(&tgt->timer);
3787 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3788 kref_put(&tgt->kref, ibmvfc_release_tgt);
3789 } else
3790 tgt_dbg(tgt, "Sent ADISC\n");
3791 }
3792
3793 /**
3794 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3795 * @evt: ibmvfc event struct
3796 *
3797 **/
ibmvfc_tgt_query_target_done(struct ibmvfc_event * evt)3798 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3799 {
3800 struct ibmvfc_target *tgt = evt->tgt;
3801 struct ibmvfc_host *vhost = evt->vhost;
3802 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3803 u32 status = be16_to_cpu(rsp->common.status);
3804 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3805
3806 vhost->discovery_threads--;
3807 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3808 switch (status) {
3809 case IBMVFC_MAD_SUCCESS:
3810 tgt_dbg(tgt, "Query Target succeeded\n");
3811 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3812 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3813 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3814 else
3815 ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3816 break;
3817 case IBMVFC_MAD_DRIVER_FAILED:
3818 break;
3819 case IBMVFC_MAD_CRQ_ERROR:
3820 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3821 break;
3822 case IBMVFC_MAD_FAILED:
3823 default:
3824 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3825 be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3826 be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3827 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3828 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3829 level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3830 else
3831 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3832
3833 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3834 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3835 rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3836 rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3837 rsp->fc_explain, status);
3838 break;
3839 }
3840
3841 kref_put(&tgt->kref, ibmvfc_release_tgt);
3842 ibmvfc_free_event(evt);
3843 wake_up(&vhost->work_wait_q);
3844 }
3845
3846 /**
3847 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3848 * @tgt: ibmvfc target struct
3849 *
3850 **/
ibmvfc_tgt_query_target(struct ibmvfc_target * tgt)3851 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3852 {
3853 struct ibmvfc_query_tgt *query_tgt;
3854 struct ibmvfc_host *vhost = tgt->vhost;
3855 struct ibmvfc_event *evt;
3856
3857 if (vhost->discovery_threads >= disc_threads)
3858 return;
3859
3860 kref_get(&tgt->kref);
3861 evt = ibmvfc_get_event(vhost);
3862 vhost->discovery_threads++;
3863 evt->tgt = tgt;
3864 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3865 query_tgt = &evt->iu.query_tgt;
3866 memset(query_tgt, 0, sizeof(*query_tgt));
3867 query_tgt->common.version = cpu_to_be32(1);
3868 query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3869 query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3870 query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3871
3872 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3873 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3874 vhost->discovery_threads--;
3875 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3876 kref_put(&tgt->kref, ibmvfc_release_tgt);
3877 } else
3878 tgt_dbg(tgt, "Sent Query Target\n");
3879 }
3880
3881 /**
3882 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3883 * @vhost: ibmvfc host struct
3884 * @scsi_id: SCSI ID to allocate target for
3885 *
3886 * Returns:
3887 * 0 on success / other on failure
3888 **/
ibmvfc_alloc_target(struct ibmvfc_host * vhost,u64 scsi_id)3889 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3890 {
3891 struct ibmvfc_target *tgt;
3892 unsigned long flags;
3893
3894 spin_lock_irqsave(vhost->host->host_lock, flags);
3895 list_for_each_entry(tgt, &vhost->targets, queue) {
3896 if (tgt->scsi_id == scsi_id) {
3897 if (tgt->need_login)
3898 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3899 goto unlock_out;
3900 }
3901 }
3902 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3903
3904 tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3905 memset(tgt, 0, sizeof(*tgt));
3906 tgt->scsi_id = scsi_id;
3907 tgt->new_scsi_id = scsi_id;
3908 tgt->vhost = vhost;
3909 tgt->need_login = 1;
3910 tgt->cancel_key = vhost->task_set++;
3911 timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
3912 kref_init(&tgt->kref);
3913 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3914 spin_lock_irqsave(vhost->host->host_lock, flags);
3915 list_add_tail(&tgt->queue, &vhost->targets);
3916
3917 unlock_out:
3918 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3919 return 0;
3920 }
3921
3922 /**
3923 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3924 * @vhost: ibmvfc host struct
3925 *
3926 * Returns:
3927 * 0 on success / other on failure
3928 **/
ibmvfc_alloc_targets(struct ibmvfc_host * vhost)3929 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3930 {
3931 int i, rc;
3932
3933 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3934 rc = ibmvfc_alloc_target(vhost,
3935 be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3936 IBMVFC_DISC_TGT_SCSI_ID_MASK);
3937
3938 return rc;
3939 }
3940
3941 /**
3942 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3943 * @evt: ibmvfc event struct
3944 *
3945 **/
ibmvfc_discover_targets_done(struct ibmvfc_event * evt)3946 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3947 {
3948 struct ibmvfc_host *vhost = evt->vhost;
3949 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3950 u32 mad_status = be16_to_cpu(rsp->common.status);
3951 int level = IBMVFC_DEFAULT_LOG_LEVEL;
3952
3953 switch (mad_status) {
3954 case IBMVFC_MAD_SUCCESS:
3955 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3956 vhost->num_targets = be32_to_cpu(rsp->num_written);
3957 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3958 break;
3959 case IBMVFC_MAD_FAILED:
3960 level += ibmvfc_retry_host_init(vhost);
3961 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3962 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3963 rsp->status, rsp->error);
3964 break;
3965 case IBMVFC_MAD_DRIVER_FAILED:
3966 break;
3967 default:
3968 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3969 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3970 break;
3971 }
3972
3973 ibmvfc_free_event(evt);
3974 wake_up(&vhost->work_wait_q);
3975 }
3976
3977 /**
3978 * ibmvfc_discover_targets - Send Discover Targets MAD
3979 * @vhost: ibmvfc host struct
3980 *
3981 **/
ibmvfc_discover_targets(struct ibmvfc_host * vhost)3982 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3983 {
3984 struct ibmvfc_discover_targets *mad;
3985 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3986
3987 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3988 mad = &evt->iu.discover_targets;
3989 memset(mad, 0, sizeof(*mad));
3990 mad->common.version = cpu_to_be32(1);
3991 mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3992 mad->common.length = cpu_to_be16(sizeof(*mad));
3993 mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
3994 mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
3995 mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
3996 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3997
3998 if (!ibmvfc_send_event(evt, vhost, default_timeout))
3999 ibmvfc_dbg(vhost, "Sent discover targets\n");
4000 else
4001 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4002 }
4003
4004 /**
4005 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4006 * @evt: ibmvfc event struct
4007 *
4008 **/
ibmvfc_npiv_login_done(struct ibmvfc_event * evt)4009 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4010 {
4011 struct ibmvfc_host *vhost = evt->vhost;
4012 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4013 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4014 unsigned int npiv_max_sectors;
4015 int level = IBMVFC_DEFAULT_LOG_LEVEL;
4016
4017 switch (mad_status) {
4018 case IBMVFC_MAD_SUCCESS:
4019 ibmvfc_free_event(evt);
4020 break;
4021 case IBMVFC_MAD_FAILED:
4022 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4023 level += ibmvfc_retry_host_init(vhost);
4024 else
4025 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4026 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4027 ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4028 rsp->status, rsp->error);
4029 ibmvfc_free_event(evt);
4030 return;
4031 case IBMVFC_MAD_CRQ_ERROR:
4032 ibmvfc_retry_host_init(vhost);
4033 case IBMVFC_MAD_DRIVER_FAILED:
4034 ibmvfc_free_event(evt);
4035 return;
4036 default:
4037 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4038 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4039 ibmvfc_free_event(evt);
4040 return;
4041 }
4042
4043 vhost->client_migrated = 0;
4044
4045 if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4046 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4047 rsp->flags);
4048 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4049 wake_up(&vhost->work_wait_q);
4050 return;
4051 }
4052
4053 if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4054 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4055 rsp->max_cmds);
4056 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4057 wake_up(&vhost->work_wait_q);
4058 return;
4059 }
4060
4061 vhost->logged_in = 1;
4062 npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4063 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4064 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4065 rsp->drc_name, npiv_max_sectors);
4066
4067 fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4068 fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4069 fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4070 fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4071 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4072 fc_host_supported_classes(vhost->host) = 0;
4073 if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4074 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4075 if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4076 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4077 if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4078 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4079 fc_host_maxframe_size(vhost->host) =
4080 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4081
4082 vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4083 vhost->host->max_sectors = npiv_max_sectors;
4084 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4085 wake_up(&vhost->work_wait_q);
4086 }
4087
4088 /**
4089 * ibmvfc_npiv_login - Sends NPIV login
4090 * @vhost: ibmvfc host struct
4091 *
4092 **/
ibmvfc_npiv_login(struct ibmvfc_host * vhost)4093 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4094 {
4095 struct ibmvfc_npiv_login_mad *mad;
4096 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4097
4098 ibmvfc_gather_partition_info(vhost);
4099 ibmvfc_set_login_info(vhost);
4100 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4101
4102 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4103 mad = &evt->iu.npiv_login;
4104 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4105 mad->common.version = cpu_to_be32(1);
4106 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4107 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4108 mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4109 mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4110
4111 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4112
4113 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4114 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4115 else
4116 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4117 };
4118
4119 /**
4120 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4121 * @vhost: ibmvfc host struct
4122 *
4123 **/
ibmvfc_npiv_logout_done(struct ibmvfc_event * evt)4124 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4125 {
4126 struct ibmvfc_host *vhost = evt->vhost;
4127 u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4128
4129 ibmvfc_free_event(evt);
4130
4131 switch (mad_status) {
4132 case IBMVFC_MAD_SUCCESS:
4133 if (list_empty(&vhost->sent) &&
4134 vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4135 ibmvfc_init_host(vhost);
4136 return;
4137 }
4138 break;
4139 case IBMVFC_MAD_FAILED:
4140 case IBMVFC_MAD_NOT_SUPPORTED:
4141 case IBMVFC_MAD_CRQ_ERROR:
4142 case IBMVFC_MAD_DRIVER_FAILED:
4143 default:
4144 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4145 break;
4146 }
4147
4148 ibmvfc_hard_reset_host(vhost);
4149 }
4150
4151 /**
4152 * ibmvfc_npiv_logout - Issue an NPIV Logout
4153 * @vhost: ibmvfc host struct
4154 *
4155 **/
ibmvfc_npiv_logout(struct ibmvfc_host * vhost)4156 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4157 {
4158 struct ibmvfc_npiv_logout_mad *mad;
4159 struct ibmvfc_event *evt;
4160
4161 evt = ibmvfc_get_event(vhost);
4162 ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4163
4164 mad = &evt->iu.npiv_logout;
4165 memset(mad, 0, sizeof(*mad));
4166 mad->common.version = cpu_to_be32(1);
4167 mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4168 mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4169
4170 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4171
4172 if (!ibmvfc_send_event(evt, vhost, default_timeout))
4173 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4174 else
4175 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4176 }
4177
4178 /**
4179 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4180 * @vhost: ibmvfc host struct
4181 *
4182 * Returns:
4183 * 1 if work to do / 0 if not
4184 **/
ibmvfc_dev_init_to_do(struct ibmvfc_host * vhost)4185 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4186 {
4187 struct ibmvfc_target *tgt;
4188
4189 list_for_each_entry(tgt, &vhost->targets, queue) {
4190 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4191 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4192 return 1;
4193 }
4194
4195 return 0;
4196 }
4197
4198 /**
4199 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4200 * @vhost: ibmvfc host struct
4201 *
4202 * Returns:
4203 * 1 if work to do / 0 if not
4204 **/
__ibmvfc_work_to_do(struct ibmvfc_host * vhost)4205 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4206 {
4207 struct ibmvfc_target *tgt;
4208
4209 if (kthread_should_stop())
4210 return 1;
4211 switch (vhost->action) {
4212 case IBMVFC_HOST_ACTION_NONE:
4213 case IBMVFC_HOST_ACTION_INIT_WAIT:
4214 case IBMVFC_HOST_ACTION_LOGO_WAIT:
4215 return 0;
4216 case IBMVFC_HOST_ACTION_TGT_INIT:
4217 case IBMVFC_HOST_ACTION_QUERY_TGTS:
4218 if (vhost->discovery_threads == disc_threads)
4219 return 0;
4220 list_for_each_entry(tgt, &vhost->targets, queue)
4221 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4222 return 1;
4223 list_for_each_entry(tgt, &vhost->targets, queue)
4224 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4225 return 0;
4226 return 1;
4227 case IBMVFC_HOST_ACTION_LOGO:
4228 case IBMVFC_HOST_ACTION_INIT:
4229 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4230 case IBMVFC_HOST_ACTION_TGT_DEL:
4231 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4232 case IBMVFC_HOST_ACTION_QUERY:
4233 case IBMVFC_HOST_ACTION_RESET:
4234 case IBMVFC_HOST_ACTION_REENABLE:
4235 default:
4236 break;
4237 }
4238
4239 return 1;
4240 }
4241
4242 /**
4243 * ibmvfc_work_to_do - Is there task level work to do?
4244 * @vhost: ibmvfc host struct
4245 *
4246 * Returns:
4247 * 1 if work to do / 0 if not
4248 **/
ibmvfc_work_to_do(struct ibmvfc_host * vhost)4249 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4250 {
4251 unsigned long flags;
4252 int rc;
4253
4254 spin_lock_irqsave(vhost->host->host_lock, flags);
4255 rc = __ibmvfc_work_to_do(vhost);
4256 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4257 return rc;
4258 }
4259
4260 /**
4261 * ibmvfc_log_ae - Log async events if necessary
4262 * @vhost: ibmvfc host struct
4263 * @events: events to log
4264 *
4265 **/
ibmvfc_log_ae(struct ibmvfc_host * vhost,int events)4266 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4267 {
4268 if (events & IBMVFC_AE_RSCN)
4269 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4270 if ((events & IBMVFC_AE_LINKDOWN) &&
4271 vhost->state >= IBMVFC_HALTED)
4272 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4273 if ((events & IBMVFC_AE_LINKUP) &&
4274 vhost->state == IBMVFC_INITIALIZING)
4275 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4276 }
4277
4278 /**
4279 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4280 * @tgt: ibmvfc target struct
4281 *
4282 **/
ibmvfc_tgt_add_rport(struct ibmvfc_target * tgt)4283 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4284 {
4285 struct ibmvfc_host *vhost = tgt->vhost;
4286 struct fc_rport *rport;
4287 unsigned long flags;
4288
4289 tgt_dbg(tgt, "Adding rport\n");
4290 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4291 spin_lock_irqsave(vhost->host->host_lock, flags);
4292
4293 if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4294 tgt_dbg(tgt, "Deleting rport\n");
4295 list_del(&tgt->queue);
4296 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4297 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4298 fc_remote_port_delete(rport);
4299 del_timer_sync(&tgt->timer);
4300 kref_put(&tgt->kref, ibmvfc_release_tgt);
4301 return;
4302 } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4303 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4304 return;
4305 }
4306
4307 if (rport) {
4308 tgt_dbg(tgt, "rport add succeeded\n");
4309 tgt->rport = rport;
4310 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4311 rport->supported_classes = 0;
4312 tgt->target_id = rport->scsi_target_id;
4313 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4314 rport->supported_classes |= FC_COS_CLASS1;
4315 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4316 rport->supported_classes |= FC_COS_CLASS2;
4317 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4318 rport->supported_classes |= FC_COS_CLASS3;
4319 if (rport->rqst_q)
4320 blk_queue_max_segments(rport->rqst_q, 1);
4321 } else
4322 tgt_dbg(tgt, "rport add failed\n");
4323 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4324 }
4325
4326 /**
4327 * ibmvfc_do_work - Do task level work
4328 * @vhost: ibmvfc host struct
4329 *
4330 **/
ibmvfc_do_work(struct ibmvfc_host * vhost)4331 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4332 {
4333 struct ibmvfc_target *tgt;
4334 unsigned long flags;
4335 struct fc_rport *rport;
4336 int rc;
4337
4338 ibmvfc_log_ae(vhost, vhost->events_to_log);
4339 spin_lock_irqsave(vhost->host->host_lock, flags);
4340 vhost->events_to_log = 0;
4341 switch (vhost->action) {
4342 case IBMVFC_HOST_ACTION_NONE:
4343 case IBMVFC_HOST_ACTION_LOGO_WAIT:
4344 case IBMVFC_HOST_ACTION_INIT_WAIT:
4345 break;
4346 case IBMVFC_HOST_ACTION_RESET:
4347 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4348 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4349 rc = ibmvfc_reset_crq(vhost);
4350 spin_lock_irqsave(vhost->host->host_lock, flags);
4351 if (rc == H_CLOSED)
4352 vio_enable_interrupts(to_vio_dev(vhost->dev));
4353 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4354 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4355 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4356 dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4357 }
4358 break;
4359 case IBMVFC_HOST_ACTION_REENABLE:
4360 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4361 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4362 rc = ibmvfc_reenable_crq_queue(vhost);
4363 spin_lock_irqsave(vhost->host->host_lock, flags);
4364 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4365 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4366 dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4367 }
4368 break;
4369 case IBMVFC_HOST_ACTION_LOGO:
4370 vhost->job_step(vhost);
4371 break;
4372 case IBMVFC_HOST_ACTION_INIT:
4373 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4374 if (vhost->delay_init) {
4375 vhost->delay_init = 0;
4376 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4377 ssleep(15);
4378 return;
4379 } else
4380 vhost->job_step(vhost);
4381 break;
4382 case IBMVFC_HOST_ACTION_QUERY:
4383 list_for_each_entry(tgt, &vhost->targets, queue)
4384 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4385 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4386 break;
4387 case IBMVFC_HOST_ACTION_QUERY_TGTS:
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);
4397 break;
4398 case IBMVFC_HOST_ACTION_TGT_DEL:
4399 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4400 list_for_each_entry(tgt, &vhost->targets, queue) {
4401 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4402 tgt_dbg(tgt, "Deleting rport\n");
4403 rport = tgt->rport;
4404 tgt->rport = NULL;
4405 list_del(&tgt->queue);
4406 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4407 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4408 if (rport)
4409 fc_remote_port_delete(rport);
4410 del_timer_sync(&tgt->timer);
4411 kref_put(&tgt->kref, ibmvfc_release_tgt);
4412 return;
4413 }
4414 }
4415
4416 if (vhost->state == IBMVFC_INITIALIZING) {
4417 if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4418 if (vhost->reinit) {
4419 vhost->reinit = 0;
4420 scsi_block_requests(vhost->host);
4421 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4422 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4423 } else {
4424 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4425 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4426 wake_up(&vhost->init_wait_q);
4427 schedule_work(&vhost->rport_add_work_q);
4428 vhost->init_retries = 0;
4429 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4430 scsi_unblock_requests(vhost->host);
4431 }
4432
4433 return;
4434 } else {
4435 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4436 vhost->job_step = ibmvfc_discover_targets;
4437 }
4438 } else {
4439 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4440 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4441 scsi_unblock_requests(vhost->host);
4442 wake_up(&vhost->init_wait_q);
4443 return;
4444 }
4445 break;
4446 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4447 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4448 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4449 ibmvfc_alloc_targets(vhost);
4450 spin_lock_irqsave(vhost->host->host_lock, flags);
4451 break;
4452 case IBMVFC_HOST_ACTION_TGT_INIT:
4453 list_for_each_entry(tgt, &vhost->targets, queue) {
4454 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4455 tgt->job_step(tgt);
4456 break;
4457 }
4458 }
4459
4460 if (!ibmvfc_dev_init_to_do(vhost))
4461 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4462 break;
4463 default:
4464 break;
4465 }
4466
4467 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4468 }
4469
4470 /**
4471 * ibmvfc_work - Do task level work
4472 * @data: ibmvfc host struct
4473 *
4474 * Returns:
4475 * zero
4476 **/
ibmvfc_work(void * data)4477 static int ibmvfc_work(void *data)
4478 {
4479 struct ibmvfc_host *vhost = data;
4480 int rc;
4481
4482 set_user_nice(current, MIN_NICE);
4483
4484 while (1) {
4485 rc = wait_event_interruptible(vhost->work_wait_q,
4486 ibmvfc_work_to_do(vhost));
4487
4488 BUG_ON(rc);
4489
4490 if (kthread_should_stop())
4491 break;
4492
4493 ibmvfc_do_work(vhost);
4494 }
4495
4496 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4497 return 0;
4498 }
4499
4500 /**
4501 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4502 * @vhost: ibmvfc host struct
4503 *
4504 * Allocates a page for messages, maps it for dma, and registers
4505 * the crq with the hypervisor.
4506 *
4507 * Return value:
4508 * zero on success / other on failure
4509 **/
ibmvfc_init_crq(struct ibmvfc_host * vhost)4510 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4511 {
4512 int rc, retrc = -ENOMEM;
4513 struct device *dev = vhost->dev;
4514 struct vio_dev *vdev = to_vio_dev(dev);
4515 struct ibmvfc_crq_queue *crq = &vhost->crq;
4516
4517 ENTER;
4518 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4519
4520 if (!crq->msgs)
4521 return -ENOMEM;
4522
4523 crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4524 crq->msg_token = dma_map_single(dev, crq->msgs,
4525 PAGE_SIZE, DMA_BIDIRECTIONAL);
4526
4527 if (dma_mapping_error(dev, crq->msg_token))
4528 goto map_failed;
4529
4530 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4531 crq->msg_token, PAGE_SIZE);
4532
4533 if (rc == H_RESOURCE)
4534 /* maybe kexecing and resource is busy. try a reset */
4535 retrc = rc = ibmvfc_reset_crq(vhost);
4536
4537 if (rc == H_CLOSED)
4538 dev_warn(dev, "Partner adapter not ready\n");
4539 else if (rc) {
4540 dev_warn(dev, "Error %d opening adapter\n", rc);
4541 goto reg_crq_failed;
4542 }
4543
4544 retrc = 0;
4545
4546 tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4547
4548 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4549 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4550 goto req_irq_failed;
4551 }
4552
4553 if ((rc = vio_enable_interrupts(vdev))) {
4554 dev_err(dev, "Error %d enabling interrupts\n", rc);
4555 goto req_irq_failed;
4556 }
4557
4558 crq->cur = 0;
4559 LEAVE;
4560 return retrc;
4561
4562 req_irq_failed:
4563 tasklet_kill(&vhost->tasklet);
4564 do {
4565 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4566 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4567 reg_crq_failed:
4568 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4569 map_failed:
4570 free_page((unsigned long)crq->msgs);
4571 return retrc;
4572 }
4573
4574 /**
4575 * ibmvfc_free_mem - Free memory for vhost
4576 * @vhost: ibmvfc host struct
4577 *
4578 * Return value:
4579 * none
4580 **/
ibmvfc_free_mem(struct ibmvfc_host * vhost)4581 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4582 {
4583 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4584
4585 ENTER;
4586 mempool_destroy(vhost->tgt_pool);
4587 kfree(vhost->trace);
4588 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4589 vhost->disc_buf_dma);
4590 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4591 vhost->login_buf, vhost->login_buf_dma);
4592 dma_pool_destroy(vhost->sg_pool);
4593 dma_unmap_single(vhost->dev, async_q->msg_token,
4594 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4595 free_page((unsigned long)async_q->msgs);
4596 LEAVE;
4597 }
4598
4599 /**
4600 * ibmvfc_alloc_mem - Allocate memory for vhost
4601 * @vhost: ibmvfc host struct
4602 *
4603 * Return value:
4604 * 0 on success / non-zero on failure
4605 **/
ibmvfc_alloc_mem(struct ibmvfc_host * vhost)4606 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4607 {
4608 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4609 struct device *dev = vhost->dev;
4610
4611 ENTER;
4612 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4613 if (!async_q->msgs) {
4614 dev_err(dev, "Couldn't allocate async queue.\n");
4615 goto nomem;
4616 }
4617
4618 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4619 async_q->msg_token = dma_map_single(dev, async_q->msgs,
4620 async_q->size * sizeof(*async_q->msgs),
4621 DMA_BIDIRECTIONAL);
4622
4623 if (dma_mapping_error(dev, async_q->msg_token)) {
4624 dev_err(dev, "Failed to map async queue\n");
4625 goto free_async_crq;
4626 }
4627
4628 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4629 SG_ALL * sizeof(struct srp_direct_buf),
4630 sizeof(struct srp_direct_buf), 0);
4631
4632 if (!vhost->sg_pool) {
4633 dev_err(dev, "Failed to allocate sg pool\n");
4634 goto unmap_async_crq;
4635 }
4636
4637 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4638 &vhost->login_buf_dma, GFP_KERNEL);
4639
4640 if (!vhost->login_buf) {
4641 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4642 goto free_sg_pool;
4643 }
4644
4645 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4646 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4647 &vhost->disc_buf_dma, GFP_KERNEL);
4648
4649 if (!vhost->disc_buf) {
4650 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4651 goto free_login_buffer;
4652 }
4653
4654 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4655 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4656
4657 if (!vhost->trace)
4658 goto free_disc_buffer;
4659
4660 vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4661 sizeof(struct ibmvfc_target));
4662
4663 if (!vhost->tgt_pool) {
4664 dev_err(dev, "Couldn't allocate target memory pool\n");
4665 goto free_trace;
4666 }
4667
4668 LEAVE;
4669 return 0;
4670
4671 free_trace:
4672 kfree(vhost->trace);
4673 free_disc_buffer:
4674 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4675 vhost->disc_buf_dma);
4676 free_login_buffer:
4677 dma_free_coherent(dev, sizeof(*vhost->login_buf),
4678 vhost->login_buf, vhost->login_buf_dma);
4679 free_sg_pool:
4680 dma_pool_destroy(vhost->sg_pool);
4681 unmap_async_crq:
4682 dma_unmap_single(dev, async_q->msg_token,
4683 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4684 free_async_crq:
4685 free_page((unsigned long)async_q->msgs);
4686 nomem:
4687 LEAVE;
4688 return -ENOMEM;
4689 }
4690
4691 /**
4692 * ibmvfc_rport_add_thread - Worker thread for rport adds
4693 * @work: work struct
4694 *
4695 **/
ibmvfc_rport_add_thread(struct work_struct * work)4696 static void ibmvfc_rport_add_thread(struct work_struct *work)
4697 {
4698 struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4699 rport_add_work_q);
4700 struct ibmvfc_target *tgt;
4701 struct fc_rport *rport;
4702 unsigned long flags;
4703 int did_work;
4704
4705 ENTER;
4706 spin_lock_irqsave(vhost->host->host_lock, flags);
4707 do {
4708 did_work = 0;
4709 if (vhost->state != IBMVFC_ACTIVE)
4710 break;
4711
4712 list_for_each_entry(tgt, &vhost->targets, queue) {
4713 if (tgt->add_rport) {
4714 did_work = 1;
4715 tgt->add_rport = 0;
4716 kref_get(&tgt->kref);
4717 rport = tgt->rport;
4718 if (!rport) {
4719 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4720 ibmvfc_tgt_add_rport(tgt);
4721 } else if (get_device(&rport->dev)) {
4722 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4723 tgt_dbg(tgt, "Setting rport roles\n");
4724 fc_remote_port_rolechg(rport, tgt->ids.roles);
4725 put_device(&rport->dev);
4726 } else {
4727 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4728 }
4729
4730 kref_put(&tgt->kref, ibmvfc_release_tgt);
4731 spin_lock_irqsave(vhost->host->host_lock, flags);
4732 break;
4733 }
4734 }
4735 } while(did_work);
4736
4737 if (vhost->state == IBMVFC_ACTIVE)
4738 vhost->scan_complete = 1;
4739 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4740 LEAVE;
4741 }
4742
4743 /**
4744 * ibmvfc_probe - Adapter hot plug add entry point
4745 * @vdev: vio device struct
4746 * @id: vio device id struct
4747 *
4748 * Return value:
4749 * 0 on success / non-zero on failure
4750 **/
ibmvfc_probe(struct vio_dev * vdev,const struct vio_device_id * id)4751 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4752 {
4753 struct ibmvfc_host *vhost;
4754 struct Scsi_Host *shost;
4755 struct device *dev = &vdev->dev;
4756 int rc = -ENOMEM;
4757
4758 ENTER;
4759 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4760 if (!shost) {
4761 dev_err(dev, "Couldn't allocate host data\n");
4762 goto out;
4763 }
4764
4765 shost->transportt = ibmvfc_transport_template;
4766 shost->can_queue = max_requests;
4767 shost->max_lun = max_lun;
4768 shost->max_id = max_targets;
4769 shost->max_sectors = IBMVFC_MAX_SECTORS;
4770 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4771 shost->unique_id = shost->host_no;
4772
4773 vhost = shost_priv(shost);
4774 INIT_LIST_HEAD(&vhost->sent);
4775 INIT_LIST_HEAD(&vhost->free);
4776 INIT_LIST_HEAD(&vhost->targets);
4777 sprintf(vhost->name, IBMVFC_NAME);
4778 vhost->host = shost;
4779 vhost->dev = dev;
4780 vhost->partition_number = -1;
4781 vhost->log_level = log_level;
4782 vhost->task_set = 1;
4783 strcpy(vhost->partition_name, "UNKNOWN");
4784 init_waitqueue_head(&vhost->work_wait_q);
4785 init_waitqueue_head(&vhost->init_wait_q);
4786 INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4787 mutex_init(&vhost->passthru_mutex);
4788
4789 if ((rc = ibmvfc_alloc_mem(vhost)))
4790 goto free_scsi_host;
4791
4792 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4793 shost->host_no);
4794
4795 if (IS_ERR(vhost->work_thread)) {
4796 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4797 PTR_ERR(vhost->work_thread));
4798 goto free_host_mem;
4799 }
4800
4801 if ((rc = ibmvfc_init_crq(vhost))) {
4802 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4803 goto kill_kthread;
4804 }
4805
4806 if ((rc = ibmvfc_init_event_pool(vhost))) {
4807 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4808 goto release_crq;
4809 }
4810
4811 if ((rc = scsi_add_host(shost, dev)))
4812 goto release_event_pool;
4813
4814 fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4815
4816 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4817 &ibmvfc_trace_attr))) {
4818 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4819 goto remove_shost;
4820 }
4821
4822 if (shost_to_fc_host(shost)->rqst_q)
4823 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4824 dev_set_drvdata(dev, vhost);
4825 spin_lock(&ibmvfc_driver_lock);
4826 list_add_tail(&vhost->queue, &ibmvfc_head);
4827 spin_unlock(&ibmvfc_driver_lock);
4828
4829 ibmvfc_send_crq_init(vhost);
4830 scsi_scan_host(shost);
4831 return 0;
4832
4833 remove_shost:
4834 scsi_remove_host(shost);
4835 release_event_pool:
4836 ibmvfc_free_event_pool(vhost);
4837 release_crq:
4838 ibmvfc_release_crq_queue(vhost);
4839 kill_kthread:
4840 kthread_stop(vhost->work_thread);
4841 free_host_mem:
4842 ibmvfc_free_mem(vhost);
4843 free_scsi_host:
4844 scsi_host_put(shost);
4845 out:
4846 LEAVE;
4847 return rc;
4848 }
4849
4850 /**
4851 * ibmvfc_remove - Adapter hot plug remove entry point
4852 * @vdev: vio device struct
4853 *
4854 * Return value:
4855 * 0
4856 **/
ibmvfc_remove(struct vio_dev * vdev)4857 static int ibmvfc_remove(struct vio_dev *vdev)
4858 {
4859 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4860 unsigned long flags;
4861
4862 ENTER;
4863 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4864
4865 spin_lock_irqsave(vhost->host->host_lock, flags);
4866 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4867 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4868
4869 ibmvfc_wait_while_resetting(vhost);
4870 ibmvfc_release_crq_queue(vhost);
4871 kthread_stop(vhost->work_thread);
4872 fc_remove_host(vhost->host);
4873 scsi_remove_host(vhost->host);
4874
4875 spin_lock_irqsave(vhost->host->host_lock, flags);
4876 ibmvfc_purge_requests(vhost, DID_ERROR);
4877 ibmvfc_free_event_pool(vhost);
4878 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4879
4880 ibmvfc_free_mem(vhost);
4881 spin_lock(&ibmvfc_driver_lock);
4882 list_del(&vhost->queue);
4883 spin_unlock(&ibmvfc_driver_lock);
4884 scsi_host_put(vhost->host);
4885 LEAVE;
4886 return 0;
4887 }
4888
4889 /**
4890 * ibmvfc_resume - Resume from suspend
4891 * @dev: device struct
4892 *
4893 * We may have lost an interrupt across suspend/resume, so kick the
4894 * interrupt handler
4895 *
4896 */
ibmvfc_resume(struct device * dev)4897 static int ibmvfc_resume(struct device *dev)
4898 {
4899 unsigned long flags;
4900 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4901 struct vio_dev *vdev = to_vio_dev(dev);
4902
4903 spin_lock_irqsave(vhost->host->host_lock, flags);
4904 vio_disable_interrupts(vdev);
4905 tasklet_schedule(&vhost->tasklet);
4906 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4907 return 0;
4908 }
4909
4910 /**
4911 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4912 * @vdev: vio device struct
4913 *
4914 * Return value:
4915 * Number of bytes the driver will need to DMA map at the same time in
4916 * order to perform well.
4917 */
ibmvfc_get_desired_dma(struct vio_dev * vdev)4918 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4919 {
4920 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4921 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4922 }
4923
4924 static const struct vio_device_id ibmvfc_device_table[] = {
4925 {"fcp", "IBM,vfc-client"},
4926 { "", "" }
4927 };
4928 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4929
4930 static const struct dev_pm_ops ibmvfc_pm_ops = {
4931 .resume = ibmvfc_resume
4932 };
4933
4934 static struct vio_driver ibmvfc_driver = {
4935 .id_table = ibmvfc_device_table,
4936 .probe = ibmvfc_probe,
4937 .remove = ibmvfc_remove,
4938 .get_desired_dma = ibmvfc_get_desired_dma,
4939 .name = IBMVFC_NAME,
4940 .pm = &ibmvfc_pm_ops,
4941 };
4942
4943 static struct fc_function_template ibmvfc_transport_functions = {
4944 .show_host_fabric_name = 1,
4945 .show_host_node_name = 1,
4946 .show_host_port_name = 1,
4947 .show_host_supported_classes = 1,
4948 .show_host_port_type = 1,
4949 .show_host_port_id = 1,
4950 .show_host_maxframe_size = 1,
4951
4952 .get_host_port_state = ibmvfc_get_host_port_state,
4953 .show_host_port_state = 1,
4954
4955 .get_host_speed = ibmvfc_get_host_speed,
4956 .show_host_speed = 1,
4957
4958 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4959 .terminate_rport_io = ibmvfc_terminate_rport_io,
4960
4961 .show_rport_maxframe_size = 1,
4962 .show_rport_supported_classes = 1,
4963
4964 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4965 .show_rport_dev_loss_tmo = 1,
4966
4967 .get_starget_node_name = ibmvfc_get_starget_node_name,
4968 .show_starget_node_name = 1,
4969
4970 .get_starget_port_name = ibmvfc_get_starget_port_name,
4971 .show_starget_port_name = 1,
4972
4973 .get_starget_port_id = ibmvfc_get_starget_port_id,
4974 .show_starget_port_id = 1,
4975
4976 .bsg_request = ibmvfc_bsg_request,
4977 .bsg_timeout = ibmvfc_bsg_timeout,
4978 };
4979
4980 /**
4981 * ibmvfc_module_init - Initialize the ibmvfc module
4982 *
4983 * Return value:
4984 * 0 on success / other on failure
4985 **/
ibmvfc_module_init(void)4986 static int __init ibmvfc_module_init(void)
4987 {
4988 int rc;
4989
4990 if (!firmware_has_feature(FW_FEATURE_VIO))
4991 return -ENODEV;
4992
4993 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4994 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4995
4996 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4997 if (!ibmvfc_transport_template)
4998 return -ENOMEM;
4999
5000 rc = vio_register_driver(&ibmvfc_driver);
5001 if (rc)
5002 fc_release_transport(ibmvfc_transport_template);
5003 return rc;
5004 }
5005
5006 /**
5007 * ibmvfc_module_exit - Teardown the ibmvfc module
5008 *
5009 * Return value:
5010 * nothing
5011 **/
ibmvfc_module_exit(void)5012 static void __exit ibmvfc_module_exit(void)
5013 {
5014 vio_unregister_driver(&ibmvfc_driver);
5015 fc_release_transport(ibmvfc_transport_template);
5016 }
5017
5018 module_init(ibmvfc_module_init);
5019 module_exit(ibmvfc_module_exit);
5020
