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[SCSI] ibmvfc: Target refcounting fixes
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072b91f9
BK		 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/of.h>
32#include <linux/stringify.h>
33#include <asm/firmware.h>
34#include <asm/irq.h>
35#include <asm/vio.h>
36#include <scsi/scsi.h>
37#include <scsi/scsi_cmnd.h>
38#include <scsi/scsi_host.h>
39#include <scsi/scsi_device.h>
40#include <scsi/scsi_tcq.h>
41#include <scsi/scsi_transport_fc.h>
42#include "ibmvfc.h"
43
44static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
45static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
46static unsigned int max_lun = IBMVFC_MAX_LUN;
47static unsigned int max_targets = IBMVFC_MAX_TARGETS;
48static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
49static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
50static unsigned int dev_loss_tmo = IBMVFC_DEV_LOSS_TMO;
51static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
52static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
53static LIST_HEAD(ibmvfc_head);
54static DEFINE_SPINLOCK(ibmvfc_driver_lock);
55static struct scsi_transport_template *ibmvfc_transport_template;
56
57MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
58MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
59MODULE_LICENSE("GPL");
60MODULE_VERSION(IBMVFC_DRIVER_VERSION);
61
62module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
63MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
64 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
65module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
66MODULE_PARM_DESC(default_timeout,
67 "Default timeout in seconds for initialization and EH commands. "
68 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
69module_param_named(max_requests, max_requests, uint, S_IRUGO);
70MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
71 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
72module_param_named(max_lun, max_lun, uint, S_IRUGO);
73MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
74 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
75module_param_named(max_targets, max_targets, uint, S_IRUGO);
76MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
77 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
78module_param_named(disc_threads, disc_threads, uint, S_IRUGO | S_IWUSR);
79MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
80 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
81module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
82MODULE_PARM_DESC(debug, "Enable driver debug information. "
83 "[Default=" __stringify(IBMVFC_DEBUG) "]");
84module_param_named(dev_loss_tmo, dev_loss_tmo, uint, S_IRUGO | S_IWUSR);
85MODULE_PARM_DESC(dev_loss_tmo, "Maximum number of seconds that the FC "
86 "transport should insulate the loss of a remote port. Once this "
87 "value is exceeded, the scsi target is removed. "
88 "[Default=" __stringify(IBMVFC_DEV_LOSS_TMO) "]");
89module_param_named(log_level, log_level, uint, 0);
90MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
91 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
92
93static const struct {
94 u16 status;
95 u16 error;
96 u8 result;
97 u8 retry;
98 int log;
99 char *name;
100} cmd_status [] = {
101 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
102 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
103 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
104 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_NO_CONNECT, 1, 1, "network down" },
105 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
106 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
107 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
108 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
109 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
110 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
111 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
112 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
113 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" },
114 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
115
116 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
117 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
118 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ABORT, 0, 1, "invalid parameter" },
119 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ABORT, 0, 1, "missing parameter" },
120 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
121 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ABORT, 0, 1, "transaction cancelled" },
122 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ABORT, 0, 1, "transaction cancelled implicit" },
123 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
124 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
125
126 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
127 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
128 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
129 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
130 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
131 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
132 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
133 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
134 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
135 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
136 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
137
138 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
139};
140
141static void ibmvfc_npiv_login(struct ibmvfc_host *);
142static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
143static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
144static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
145
146static const char *unknown_error = "unknown error";
147
148#ifdef CONFIG_SCSI_IBMVFC_TRACE
149/**
150 * ibmvfc_trc_start - Log a start trace entry
151 * @evt: ibmvfc event struct
152 *
153 **/
154static void ibmvfc_trc_start(struct ibmvfc_event *evt)
155{
156 struct ibmvfc_host *vhost = evt->vhost;
157 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
158 struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
159 struct ibmvfc_trace_entry *entry;
160
161 entry = &vhost->trace[vhost->trace_index++];
162 entry->evt = evt;
163 entry->time = jiffies;
164 entry->fmt = evt->crq.format;
165 entry->type = IBMVFC_TRC_START;
166
167 switch (entry->fmt) {
168 case IBMVFC_CMD_FORMAT:
169 entry->op_code = vfc_cmd->iu.cdb[0];
170 entry->scsi_id = vfc_cmd->tgt_scsi_id;
171 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
172 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
173 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
174 break;
175 case IBMVFC_MAD_FORMAT:
176 entry->op_code = mad->opcode;
177 break;
178 default:
179 break;
180 };
181}
182
183/**
184 * ibmvfc_trc_end - Log an end trace entry
185 * @evt: ibmvfc event struct
186 *
187 **/
188static void ibmvfc_trc_end(struct ibmvfc_event *evt)
189{
190 struct ibmvfc_host *vhost = evt->vhost;
191 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
192 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
193 struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
194
195 entry->evt = evt;
196 entry->time = jiffies;
197 entry->fmt = evt->crq.format;
198 entry->type = IBMVFC_TRC_END;
199
200 switch (entry->fmt) {
201 case IBMVFC_CMD_FORMAT:
202 entry->op_code = vfc_cmd->iu.cdb[0];
203 entry->scsi_id = vfc_cmd->tgt_scsi_id;
204 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
205 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
206 entry->u.end.status = vfc_cmd->status;
207 entry->u.end.error = vfc_cmd->error;
208 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
209 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
210 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
211 break;
212 case IBMVFC_MAD_FORMAT:
213 entry->op_code = mad->opcode;
214 entry->u.end.status = mad->status;
215 break;
216 default:
217 break;
218
219 };
220}
221
222#else
223#define ibmvfc_trc_start(evt) do { } while (0)
224#define ibmvfc_trc_end(evt) do { } while (0)
225#endif
226
227/**
228 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
229 * @status: status / error class
230 * @error: error
231 *
232 * Return value:
233 * index into cmd_status / -EINVAL on failure
234 **/
235static int ibmvfc_get_err_index(u16 status, u16 error)
236{
237 int i;
238
239 for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
240 if ((cmd_status[i].status & status) == cmd_status[i].status &&
241 cmd_status[i].error == error)
242 return i;
243
244 return -EINVAL;
245}
246
247/**
248 * ibmvfc_get_cmd_error - Find the error description for the fcp response
249 * @status: status / error class
250 * @error: error
251 *
252 * Return value:
253 * error description string
254 **/
255static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
256{
257 int rc = ibmvfc_get_err_index(status, error);
258 if (rc >= 0)
259 return cmd_status[rc].name;
260 return unknown_error;
261}
262
263/**
264 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
265 * @vfc_cmd: ibmvfc command struct
266 *
267 * Return value:
268 * SCSI result value to return for completed command
269 **/
270static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
271{
272 int err;
273 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
274 int fc_rsp_len = rsp->fcp_rsp_len;
275
276 if ((rsp->flags & FCP_RSP_LEN_VALID) &&
277 ((!fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
278 rsp->data.info.rsp_code))
279 return DID_ERROR << 16;
280
281 if (!vfc_cmd->status) {
282 if (rsp->flags & FCP_RESID_OVER)
283 return rsp->scsi_status | (DID_ERROR << 16);
284 else
285 return rsp->scsi_status | (DID_OK << 16);
286 }
287
288 err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
289 if (err >= 0)
290 return rsp->scsi_status | (cmd_status[err].result << 16);
291 return rsp->scsi_status | (DID_ERROR << 16);
292}
293
294/**
295 * ibmvfc_retry_cmd - Determine if error status is retryable
296 * @status: status / error class
297 * @error: error
298 *
299 * Return value:
300 * 1 if error should be retried / 0 if it should not
301 **/
302static int ibmvfc_retry_cmd(u16 status, u16 error)
303{
304 int rc = ibmvfc_get_err_index(status, error);
305
306 if (rc >= 0)
307 return cmd_status[rc].retry;
308 return 1;
309}
310
311static const char *unknown_fc_explain = "unknown fc explain";
312
313static const struct {
314 u16 fc_explain;
315 char *name;
316} ls_explain [] = {
317 { 0x00, "no additional explanation" },
318 { 0x01, "service parameter error - options" },
319 { 0x03, "service parameter error - initiator control" },
320 { 0x05, "service parameter error - recipient control" },
321 { 0x07, "service parameter error - received data field size" },
322 { 0x09, "service parameter error - concurrent seq" },
323 { 0x0B, "service parameter error - credit" },
324 { 0x0D, "invalid N_Port/F_Port_Name" },
325 { 0x0E, "invalid node/Fabric Name" },
326 { 0x0F, "invalid common service parameters" },
327 { 0x11, "invalid association header" },
328 { 0x13, "association header required" },
329 { 0x15, "invalid originator S_ID" },
330 { 0x17, "invalid OX_ID-RX-ID combination" },
331 { 0x19, "command (request) already in progress" },
332 { 0x1E, "N_Port Login requested" },
333 { 0x1F, "Invalid N_Port_ID" },
334};
335
336static const struct {
337 u16 fc_explain;
338 char *name;
339} gs_explain [] = {
340 { 0x00, "no additional explanation" },
341 { 0x01, "port identifier not registered" },
342 { 0x02, "port name not registered" },
343 { 0x03, "node name not registered" },
344 { 0x04, "class of service not registered" },
345 { 0x06, "initial process associator not registered" },
346 { 0x07, "FC-4 TYPEs not registered" },
347 { 0x08, "symbolic port name not registered" },
348 { 0x09, "symbolic node name not registered" },
349 { 0x0A, "port type not registered" },
350 { 0xF0, "authorization exception" },
351 { 0xF1, "authentication exception" },
352 { 0xF2, "data base full" },
353 { 0xF3, "data base empty" },
354 { 0xF4, "processing request" },
355 { 0xF5, "unable to verify connection" },
356 { 0xF6, "devices not in a common zone" },
357};
358
359/**
360 * ibmvfc_get_ls_explain - Return the FC Explain description text
361 * @status: FC Explain status
362 *
363 * Returns:
364 * error string
365 **/
366static const char *ibmvfc_get_ls_explain(u16 status)
367{
368 int i;
369
370 for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
371 if (ls_explain[i].fc_explain == status)
372 return ls_explain[i].name;
373
374 return unknown_fc_explain;
375}
376
377/**
378 * ibmvfc_get_gs_explain - Return the FC Explain description text
379 * @status: FC Explain status
380 *
381 * Returns:
382 * error string
383 **/
384static const char *ibmvfc_get_gs_explain(u16 status)
385{
386 int i;
387
388 for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
389 if (gs_explain[i].fc_explain == status)
390 return gs_explain[i].name;
391
392 return unknown_fc_explain;
393}
394
395static const struct {
396 enum ibmvfc_fc_type fc_type;
397 char *name;
398} fc_type [] = {
399 { IBMVFC_FABRIC_REJECT, "fabric reject" },
400 { IBMVFC_PORT_REJECT, "port reject" },
401 { IBMVFC_LS_REJECT, "ELS reject" },
402 { IBMVFC_FABRIC_BUSY, "fabric busy" },
403 { IBMVFC_PORT_BUSY, "port busy" },
404 { IBMVFC_BASIC_REJECT, "basic reject" },
405};
406
407static const char *unknown_fc_type = "unknown fc type";
408
409/**
410 * ibmvfc_get_fc_type - Return the FC Type description text
411 * @status: FC Type error status
412 *
413 * Returns:
414 * error string
415 **/
416static const char *ibmvfc_get_fc_type(u16 status)
417{
418 int i;
419
420 for (i = 0; i < ARRAY_SIZE(fc_type); i++)
421 if (fc_type[i].fc_type == status)
422 return fc_type[i].name;
423
424 return unknown_fc_type;
425}
426
427/**
428 * ibmvfc_set_tgt_action - Set the next init action for the target
429 * @tgt: ibmvfc target struct
430 * @action: action to perform
431 *
432 **/
433static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
434 enum ibmvfc_target_action action)
435{
436 switch (tgt->action) {
437 case IBMVFC_TGT_ACTION_DEL_RPORT:
438 break;
439 default:
440 tgt->action = action;
441 break;
442 }
443}
444
445/**
446 * ibmvfc_set_host_state - Set the state for the host
447 * @vhost: ibmvfc host struct
448 * @state: state to set host to
449 *
450 * Returns:
451 * 0 if state changed / non-zero if not changed
452 **/
453static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
454 enum ibmvfc_host_state state)
455{
456 int rc = 0;
457
458 switch (vhost->state) {
459 case IBMVFC_HOST_OFFLINE:
460 rc = -EINVAL;
461 break;
462 default:
463 vhost->state = state;
464 break;
465 };
466
467 return rc;
468}
469
470/**
471 * ibmvfc_set_host_action - Set the next init action for the host
472 * @vhost: ibmvfc host struct
473 * @action: action to perform
474 *
475 **/
476static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
477 enum ibmvfc_host_action action)
478{
479 switch (action) {
480 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
481 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
482 vhost->action = action;
483 break;
484 case IBMVFC_HOST_ACTION_INIT_WAIT:
485 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
486 vhost->action = action;
487 break;
488 case IBMVFC_HOST_ACTION_QUERY:
489 switch (vhost->action) {
490 case IBMVFC_HOST_ACTION_INIT_WAIT:
491 case IBMVFC_HOST_ACTION_NONE:
492 case IBMVFC_HOST_ACTION_TGT_ADD:
493 vhost->action = action;
494 break;
495 default:
496 break;
497 };
498 break;
499 case IBMVFC_HOST_ACTION_TGT_INIT:
500 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
501 vhost->action = action;
502 break;
503 case IBMVFC_HOST_ACTION_INIT:
504 case IBMVFC_HOST_ACTION_TGT_DEL:
505 case IBMVFC_HOST_ACTION_QUERY_TGTS:
506 case IBMVFC_HOST_ACTION_TGT_ADD:
507 case IBMVFC_HOST_ACTION_NONE:
508 default:
509 vhost->action = action;
510 break;
511 };
512}
513
514/**
515 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
516 * @vhost: ibmvfc host struct
517 *
518 * Return value:
519 * nothing
520 **/
521static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
522{
523 if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
524 scsi_block_requests(vhost->host);
525 ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING);
526 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
527 } else
528 vhost->reinit = 1;
529
530 wake_up(&vhost->work_wait_q);
531}
532
533/**
534 * ibmvfc_link_down - Handle a link down event from the adapter
535 * @vhost: ibmvfc host struct
536 * @state: ibmvfc host state to enter
537 *
538 **/
539static void ibmvfc_link_down(struct ibmvfc_host *vhost,
540 enum ibmvfc_host_state state)
541{
542 struct ibmvfc_target *tgt;
543
544 ENTER;
545 scsi_block_requests(vhost->host);
546 list_for_each_entry(tgt, &vhost->targets, queue)
547 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
548 ibmvfc_set_host_state(vhost, state);
549 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
550 vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
551 wake_up(&vhost->work_wait_q);
552 LEAVE;
553}
554
555/**
556 * ibmvfc_init_host - Start host initialization
557 * @vhost: ibmvfc host struct
558 *
559 * Return value:
560 * nothing
561 **/
562static void ibmvfc_init_host(struct ibmvfc_host *vhost)
563{
564 struct ibmvfc_target *tgt;
565
566 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
567 if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) {
568 dev_err(vhost->dev,
569 "Host initialization retries exceeded. Taking adapter offline\n");
570 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
571 return;
572 }
573 }
574
575 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
576 list_for_each_entry(tgt, &vhost->targets, queue)
577 tgt->need_login = 1;
578 scsi_block_requests(vhost->host);
579 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
580 vhost->job_step = ibmvfc_npiv_login;
581 wake_up(&vhost->work_wait_q);
582 }
583}
584
585/**
586 * ibmvfc_send_crq - Send a CRQ
587 * @vhost: ibmvfc host struct
588 * @word1: the first 64 bits of the data
589 * @word2: the second 64 bits of the data
590 *
591 * Return value:
592 * 0 on success / other on failure
593 **/
594static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
595{
596 struct vio_dev *vdev = to_vio_dev(vhost->dev);
597 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
598}
599
600/**
601 * ibmvfc_send_crq_init - Send a CRQ init message
602 * @vhost: ibmvfc host struct
603 *
604 * Return value:
605 * 0 on success / other on failure
606 **/
607static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
608{
609 ibmvfc_dbg(vhost, "Sending CRQ init\n");
610 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
611}
612
613/**
614 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
615 * @vhost: ibmvfc host struct
616 *
617 * Return value:
618 * 0 on success / other on failure
619 **/
620static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
621{
622 ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
623 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
624}
625
626/**
627 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
628 * @vhost: ibmvfc host struct
629 *
630 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
631 * the crq with the hypervisor.
632 **/
633static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
634{
635 long rc;
636 struct vio_dev *vdev = to_vio_dev(vhost->dev);
637 struct ibmvfc_crq_queue *crq = &vhost->crq;
638
639 ibmvfc_dbg(vhost, "Releasing CRQ\n");
640 free_irq(vdev->irq, vhost);
641 do {
642 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
643 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
644
645 vhost->state = IBMVFC_NO_CRQ;
646 dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
647 free_page((unsigned long)crq->msgs);
648}
649
650/**
651 * ibmvfc_reenable_crq_queue - reenables the CRQ
652 * @vhost: ibmvfc host struct
653 *
654 * Return value:
655 * 0 on success / other on failure
656 **/
657static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
658{
659 int rc;
660 struct vio_dev *vdev = to_vio_dev(vhost->dev);
661
662 /* Re-enable the CRQ */
663 do {
664 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
665 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
666
667 if (rc)
668 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
669
670 return rc;
671}
672
673/**
674 * ibmvfc_reset_crq - resets a crq after a failure
675 * @vhost: ibmvfc host struct
676 *
677 * Return value:
678 * 0 on success / other on failure
679 **/
680static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
681{
682 int rc;
683 struct vio_dev *vdev = to_vio_dev(vhost->dev);
684 struct ibmvfc_crq_queue *crq = &vhost->crq;
685
686 /* Close the CRQ */
687 do {
688 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
689 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
690
691 vhost->state = IBMVFC_NO_CRQ;
692 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
693
694 /* Clean out the queue */
695 memset(crq->msgs, 0, PAGE_SIZE);
696 crq->cur = 0;
697
698 /* And re-open it again */
699 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
700 crq->msg_token, PAGE_SIZE);
701
702 if (rc == H_CLOSED)
703 /* Adapter is good, but other end is not ready */
704 dev_warn(vhost->dev, "Partner adapter not ready\n");
705 else if (rc != 0)
706 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
707
708 return rc;
709}
710
711/**
712 * ibmvfc_valid_event - Determines if event is valid.
713 * @pool: event_pool that contains the event
714 * @evt: ibmvfc event to be checked for validity
715 *
716 * Return value:
717 * 1 if event is valid / 0 if event is not valid
718 **/
719static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
720 struct ibmvfc_event *evt)
721{
722 int index = evt - pool->events;
723 if (index < 0 || index >= pool->size) /* outside of bounds */
724 return 0;
725 if (evt != pool->events + index) /* unaligned */
726 return 0;
727 return 1;
728}
729
730/**
731 * ibmvfc_free_event - Free the specified event
732 * @evt: ibmvfc_event to be freed
733 *
734 **/
735static void ibmvfc_free_event(struct ibmvfc_event *evt)
736{
737 struct ibmvfc_host *vhost = evt->vhost;
738 struct ibmvfc_event_pool *pool = &vhost->pool;
739
740 BUG_ON(!ibmvfc_valid_event(pool, evt));
741 BUG_ON(atomic_inc_return(&evt->free) != 1);
742 list_add_tail(&evt->queue, &vhost->free);
743}
744
745/**
746 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
747 * @evt: ibmvfc event struct
748 *
749 * This function does not setup any error status, that must be done
750 * before this function gets called.
751 **/
752static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
753{
754 struct scsi_cmnd *cmnd = evt->cmnd;
755
756 if (cmnd) {
757 scsi_dma_unmap(cmnd);
758 cmnd->scsi_done(cmnd);
759 }
760
761 ibmvfc_free_event(evt);
762}
763
764/**
765 * ibmvfc_fail_request - Fail request with specified error code
766 * @evt: ibmvfc event struct
767 * @error_code: error code to fail request with
768 *
769 * Return value:
770 * none
771 **/
772static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
773{
774 if (evt->cmnd) {
775 evt->cmnd->result = (error_code << 16);
776 evt->done = ibmvfc_scsi_eh_done;
777 } else
778 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
779
780 list_del(&evt->queue);
781 del_timer(&evt->timer);
782 ibmvfc_trc_end(evt);
783 evt->done(evt);
784}
785
786/**
787 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
788 * @vhost: ibmvfc host struct
789 * @error_code: error code to fail requests with
790 *
791 * Return value:
792 * none
793 **/
794static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
795{
796 struct ibmvfc_event *evt, *pos;
797
798 ibmvfc_dbg(vhost, "Purging all requests\n");
799 list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
800 ibmvfc_fail_request(evt, error_code);
801}
802
803/**
804 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
805 * @vhost: struct ibmvfc host to reset
806 **/
807static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
808{
809 int rc;
810
811 scsi_block_requests(vhost->host);
812 ibmvfc_purge_requests(vhost, DID_ERROR);
813 if ((rc = ibmvfc_reset_crq(vhost)) ||
814 (rc = ibmvfc_send_crq_init(vhost)) ||
815 (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
816 dev_err(vhost->dev, "Error after reset rc=%d\n", rc);
817 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
818 } else
819 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
820}
821
822/**
823 * ibmvfc_reset_host - Reset the connection to the server
824 * @vhost: struct ibmvfc host to reset
825 **/
826static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
827{
828 unsigned long flags;
829
830 spin_lock_irqsave(vhost->host->host_lock, flags);
831 __ibmvfc_reset_host(vhost);
832 spin_unlock_irqrestore(vhost->host->host_lock, flags);
833}
834
835/**
836 * ibmvfc_retry_host_init - Retry host initialization if allowed
837 * @vhost: ibmvfc host struct
838 *
839 **/
840static void ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
841{
842 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
843 if (++vhost->init_retries > IBMVFC_MAX_INIT_RETRIES) {
844 dev_err(vhost->dev,
845 "Host initialization retries exceeded. Taking adapter offline\n");
846 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
847 } else if (vhost->init_retries == IBMVFC_MAX_INIT_RETRIES)
848 __ibmvfc_reset_host(vhost);
849 else
850 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
851 }
852
853 wake_up(&vhost->work_wait_q);
854}
855
856/**
b3c10489 857 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
072b91f9
BK		 858 * @starget: scsi target struct
859 *
860 * Return value:
861 * ibmvfc_target struct / NULL if not found
862 **/
b3c10489 863static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
072b91f9
BK		 864{
865 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
866 struct ibmvfc_host *vhost = shost_priv(shost);
867 struct ibmvfc_target *tgt;
868
869 list_for_each_entry(tgt, &vhost->targets, queue)
b3c10489
BK		 870 if (tgt->target_id == starget->id) {
871 kref_get(&tgt->kref);
072b91f9 872 return tgt;
b3c10489 873 }
072b91f9
BK		 874 return NULL;
875}
876
877/**
b3c10489 878 * ibmvfc_get_target - Find the specified scsi_target
072b91f9
BK		 879 * @starget: scsi target struct
880 *
881 * Return value:
882 * ibmvfc_target struct / NULL if not found
883 **/
b3c10489 884static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
072b91f9
BK		 885{
886 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
887 struct ibmvfc_target *tgt;
888 unsigned long flags;
889
890 spin_lock_irqsave(shost->host_lock, flags);
b3c10489 891 tgt = __ibmvfc_get_target(starget);
072b91f9
BK		 892 spin_unlock_irqrestore(shost->host_lock, flags);
893 return tgt;
894}
895
896/**
897 * ibmvfc_get_host_speed - Get host port speed
898 * @shost: scsi host struct
899 *
900 * Return value:
901 * none
902 **/
903static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
904{
905 struct ibmvfc_host *vhost = shost_priv(shost);
906 unsigned long flags;
907
908 spin_lock_irqsave(shost->host_lock, flags);
909 if (vhost->state == IBMVFC_ACTIVE) {
910 switch (vhost->login_buf->resp.link_speed / 100) {
911 case 1:
912 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
913 break;
914 case 2:
915 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
916 break;
917 case 4:
918 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
919 break;
920 case 8:
921 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
922 break;
923 case 10:
924 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
925 break;
926 case 16:
927 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
928 break;
929 default:
930 ibmvfc_log(vhost, 3, "Unknown port speed: %ld Gbit\n",
931 vhost->login_buf->resp.link_speed / 100);
932 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
933 break;
934 }
935 } else
936 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
937 spin_unlock_irqrestore(shost->host_lock, flags);
938}
939
940/**
941 * ibmvfc_get_host_port_state - Get host port state
942 * @shost: scsi host struct
943 *
944 * Return value:
945 * none
946 **/
947static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
948{
949 struct ibmvfc_host *vhost = shost_priv(shost);
950 unsigned long flags;
951
952 spin_lock_irqsave(shost->host_lock, flags);
953 switch (vhost->state) {
954 case IBMVFC_INITIALIZING:
955 case IBMVFC_ACTIVE:
956 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
957 break;
958 case IBMVFC_LINK_DOWN:
959 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
960 break;
961 case IBMVFC_LINK_DEAD:
962 case IBMVFC_HOST_OFFLINE:
963 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
964 break;
965 case IBMVFC_HALTED:
966 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
967 break;
0ae808e0
BK		 968 case IBMVFC_NO_CRQ:
969 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
970 break;
072b91f9
BK		 971 default:
972 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
973 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
974 break;
975 }
976 spin_unlock_irqrestore(shost->host_lock, flags);
977}
978
979/**
980 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
981 * @rport: rport struct
982 * @timeout: timeout value
983 *
984 * Return value:
985 * none
986 **/
987static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
988{
989 if (timeout)
990 rport->dev_loss_tmo = timeout;
991 else
992 rport->dev_loss_tmo = 1;
993}
994
b3c10489
BK		 995/**
996 * ibmvfc_release_tgt - Free memory allocated for a target
997 * @kref: kref struct
998 *
999 **/
1000static void ibmvfc_release_tgt(struct kref *kref)
1001{
1002 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1003 kfree(tgt);
1004}
1005
072b91f9
BK		 1006/**
1007 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1008 * @starget: scsi target struct
1009 *
1010 * Return value:
1011 * none
1012 **/
1013static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1014{
b3c10489 1015 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
072b91f9 1016 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
b3c10489
BK		 1017 if (tgt)
1018 kref_put(&tgt->kref, ibmvfc_release_tgt);
072b91f9
BK		 1019}
1020
1021/**
1022 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1023 * @starget: scsi target struct
1024 *
1025 * Return value:
1026 * none
1027 **/
1028static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1029{
b3c10489 1030 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
072b91f9 1031 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
b3c10489
BK		 1032 if (tgt)
1033 kref_put(&tgt->kref, ibmvfc_release_tgt);
072b91f9
BK		 1034}
1035
1036/**
1037 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1038 * @starget: scsi target struct
1039 *
1040 * Return value:
1041 * none
1042 **/
1043static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1044{
b3c10489 1045 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
072b91f9 1046 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
b3c10489
BK		 1047 if (tgt)
1048 kref_put(&tgt->kref, ibmvfc_release_tgt);
072b91f9
BK		 1049}
1050
1051/**
1052 * ibmvfc_wait_while_resetting - Wait while the host resets
1053 * @vhost: ibmvfc host struct
1054 *
1055 * Return value:
1056 * 0 on success / other on failure
1057 **/
1058static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1059{
1060 long timeout = wait_event_timeout(vhost->init_wait_q,
1061 (vhost->state == IBMVFC_ACTIVE ||
1062 vhost->state == IBMVFC_HOST_OFFLINE ||
1063 vhost->state == IBMVFC_LINK_DEAD),
1064 (init_timeout * HZ));
1065
1066 return timeout ? 0 : -EIO;
1067}
1068
1069/**
1070 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1071 * @shost: scsi host struct
1072 *
1073 * Return value:
1074 * 0 on success / other on failure
1075 **/
1076static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1077{
1078 struct ibmvfc_host *vhost = shost_priv(shost);
1079
1080 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1081 ibmvfc_reset_host(vhost);
1082 return ibmvfc_wait_while_resetting(vhost);
1083}
1084
1085/**
1086 * ibmvfc_gather_partition_info - Gather info about the LPAR
1087 *
1088 * Return value:
1089 * none
1090 **/
1091static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1092{
1093 struct device_node *rootdn;
1094 const char *name;
1095 const unsigned int *num;
1096
1097 rootdn = of_find_node_by_path("/");
1098 if (!rootdn)
1099 return;
1100
1101 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1102 if (name)
1103 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1104 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1105 if (num)
1106 vhost->partition_number = *num;
1107 of_node_put(rootdn);
1108}
1109
1110/**
1111 * ibmvfc_set_login_info - Setup info for NPIV login
1112 * @vhost: ibmvfc host struct
1113 *
1114 * Return value:
1115 * none
1116 **/
1117static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1118{
1119 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1120 struct device_node *of_node = vhost->dev->archdata.of_node;
1121 const char *location;
1122
1123 memset(login_info, 0, sizeof(*login_info));
1124
1125 login_info->ostype = IBMVFC_OS_LINUX;
1126 login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1127 login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1128 login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1129 login_info->partition_num = vhost->partition_number;
1130 login_info->vfc_frame_version = 1;
1131 login_info->fcp_version = 3;
1132 if (vhost->client_migrated)
1133 login_info->flags = IBMVFC_CLIENT_MIGRATED;
1134
1135 login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1136 login_info->capabilities = IBMVFC_CAN_MIGRATE;
1137 login_info->async.va = vhost->async_crq.msg_token;
1138 login_info->async.len = vhost->async_crq.size;
1139 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1140 strncpy(login_info->device_name,
1141 vhost->host->shost_gendev.bus_id, IBMVFC_MAX_NAME);
1142
1143 location = of_get_property(of_node, "ibm,loc-code", NULL);
1144 location = location ? location : vhost->dev->bus_id;
1145 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1146}
1147
1148/**
1149 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1150 * @vhost: ibmvfc host who owns the event pool
1151 *
1152 * Returns zero on success.
1153 **/
1154static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1155{
1156 int i;
1157 struct ibmvfc_event_pool *pool = &vhost->pool;
1158
1159 ENTER;
1160 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1161 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1162 if (!pool->events)
1163 return -ENOMEM;
1164
1165 pool->iu_storage = dma_alloc_coherent(vhost->dev,
1166 pool->size * sizeof(*pool->iu_storage),
1167 &pool->iu_token, 0);
1168
1169 if (!pool->iu_storage) {
1170 kfree(pool->events);
1171 return -ENOMEM;
1172 }
1173
1174 for (i = 0; i < pool->size; ++i) {
1175 struct ibmvfc_event *evt = &pool->events[i];
1176 atomic_set(&evt->free, 1);
1177 evt->crq.valid = 0x80;
1178 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1179 evt->xfer_iu = pool->iu_storage + i;
1180 evt->vhost = vhost;
1181 evt->ext_list = NULL;
1182 list_add_tail(&evt->queue, &vhost->free);
1183 }
1184
1185 LEAVE;
1186 return 0;
1187}
1188
1189/**
1190 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1191 * @vhost: ibmvfc host who owns the event pool
1192 *
1193 **/
1194static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1195{
1196 int i;
1197 struct ibmvfc_event_pool *pool = &vhost->pool;
1198
1199 ENTER;
1200 for (i = 0; i < pool->size; ++i) {
1201 list_del(&pool->events[i].queue);
1202 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1203 if (pool->events[i].ext_list)
1204 dma_pool_free(vhost->sg_pool,
1205 pool->events[i].ext_list,
1206 pool->events[i].ext_list_token);
1207 }
1208
1209 kfree(pool->events);
1210 dma_free_coherent(vhost->dev,
1211 pool->size * sizeof(*pool->iu_storage),
1212 pool->iu_storage, pool->iu_token);
1213 LEAVE;
1214}
1215
1216/**
1217 * ibmvfc_get_event - Gets the next free event in pool
1218 * @vhost: ibmvfc host struct
1219 *
1220 * Returns a free event from the pool.
1221 **/
1222static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1223{
1224 struct ibmvfc_event *evt;
1225
1226 BUG_ON(list_empty(&vhost->free));
1227 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1228 atomic_set(&evt->free, 0);
1229 list_del(&evt->queue);
1230 return evt;
1231}
1232
1233/**
1234 * ibmvfc_init_event - Initialize fields in an event struct that are always
1235 * required.
1236 * @evt: The event
1237 * @done: Routine to call when the event is responded to
1238 * @format: SRP or MAD format
1239 **/
1240static void ibmvfc_init_event(struct ibmvfc_event *evt,
1241 void (*done) (struct ibmvfc_event *), u8 format)
1242{
1243 evt->cmnd = NULL;
1244 evt->sync_iu = NULL;
1245 evt->crq.format = format;
1246 evt->done = done;
1247}
1248
1249/**
1250 * ibmvfc_map_sg_list - Initialize scatterlist
1251 * @scmd: scsi command struct
1252 * @nseg: number of scatterlist segments
1253 * @md: memory descriptor list to initialize
1254 **/
1255static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1256 struct srp_direct_buf *md)
1257{
1258 int i;
1259 struct scatterlist *sg;
1260
1261 scsi_for_each_sg(scmd, sg, nseg, i) {
1262 md[i].va = sg_dma_address(sg);
1263 md[i].len = sg_dma_len(sg);
1264 md[i].key = 0;
1265 }
1266}
1267
1268/**
1269 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1270 * @scmd: Scsi_Cmnd with the scatterlist
1271 * @evt: ibmvfc event struct
1272 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1273 * @dev: device for which to map dma memory
1274 *
1275 * Returns:
1276 * 0 on success / non-zero on failure
1277 **/
1278static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1279 struct ibmvfc_event *evt,
1280 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1281{
1282
1283 int sg_mapped;
1284 struct srp_direct_buf *data = &vfc_cmd->ioba;
1285 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1286
1287 sg_mapped = scsi_dma_map(scmd);
1288 if (!sg_mapped) {
1289 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1290 return 0;
1291 } else if (unlikely(sg_mapped < 0)) {
1292 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1293 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1294 return sg_mapped;
1295 }
1296
1297 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1298 vfc_cmd->flags |= IBMVFC_WRITE;
1299 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1300 } else {
1301 vfc_cmd->flags |= IBMVFC_READ;
1302 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1303 }
1304
1305 if (sg_mapped == 1) {
1306 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1307 return 0;
1308 }
1309
1310 vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1311
1312 if (!evt->ext_list) {
1313 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1314 &evt->ext_list_token);
1315
1316 if (!evt->ext_list) {
1317 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1318 return -ENOMEM;
1319 }
1320 }
1321
1322 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1323
1324 data->va = evt->ext_list_token;
1325 data->len = sg_mapped * sizeof(struct srp_direct_buf);
1326 data->key = 0;
1327 return 0;
1328}
1329
1330/**
1331 * ibmvfc_timeout - Internal command timeout handler
1332 * @evt: struct ibmvfc_event that timed out
1333 *
1334 * Called when an internally generated command times out
1335 **/
1336static void ibmvfc_timeout(struct ibmvfc_event *evt)
1337{
1338 struct ibmvfc_host *vhost = evt->vhost;
1339 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1340 ibmvfc_reset_host(vhost);
1341}
1342
1343/**
1344 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1345 * @evt: event to be sent
1346 * @vhost: ibmvfc host struct
1347 * @timeout: timeout in seconds - 0 means do not time command
1348 *
1349 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1350 **/
1351static int ibmvfc_send_event(struct ibmvfc_event *evt,
1352 struct ibmvfc_host *vhost, unsigned long timeout)
1353{
1354 u64 *crq_as_u64 = (u64 *) &evt->crq;
1355 int rc;
1356
1357 /* Copy the IU into the transfer area */
1358 *evt->xfer_iu = evt->iu;
1359 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1360 evt->xfer_iu->cmd.tag = (u64)evt;
1361 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1362 evt->xfer_iu->mad_common.tag = (u64)evt;
1363 else
1364 BUG();
1365
1366 list_add_tail(&evt->queue, &vhost->sent);
1367 init_timer(&evt->timer);
1368
1369 if (timeout) {
1370 evt->timer.data = (unsigned long) evt;
1371 evt->timer.expires = jiffies + (timeout * HZ);
1372 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1373 add_timer(&evt->timer);
1374 }
1375
1376 if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1377 list_del(&evt->queue);
1378 del_timer(&evt->timer);
1379
1380 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1381 * Firmware will send a CRQ with a transport event (0xFF) to
1382 * tell this client what has happened to the transport. This
1383 * will be handled in ibmvfc_handle_crq()
1384 */
1385 if (rc == H_CLOSED) {
1386 if (printk_ratelimit())
1387 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1388 if (evt->cmnd)
1389 scsi_dma_unmap(evt->cmnd);
1390 ibmvfc_free_event(evt);
1391 return SCSI_MLQUEUE_HOST_BUSY;
1392 }
1393
1394 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1395 if (evt->cmnd) {
1396 evt->cmnd->result = DID_ERROR << 16;
1397 evt->done = ibmvfc_scsi_eh_done;
1398 } else
1399 evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1400
1401 evt->done(evt);
1402 } else
1403 ibmvfc_trc_start(evt);
1404
1405 return 0;
1406}
1407
1408/**
1409 * ibmvfc_log_error - Log an error for the failed command if appropriate
1410 * @evt: ibmvfc event to log
1411 *
1412 **/
1413static void ibmvfc_log_error(struct ibmvfc_event *evt)
1414{
1415 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1416 struct ibmvfc_host *vhost = evt->vhost;
1417 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1418 struct scsi_cmnd *cmnd = evt->cmnd;
1419 const char *err = unknown_error;
1420 int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1421 int logerr = 0;
1422 int rsp_code = 0;
1423
1424 if (index >= 0) {
1425 logerr = cmd_status[index].log;
1426 err = cmd_status[index].name;
1427 }
1428
0ae808e0 1429 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
072b91f9
BK		 1430 return;
1431
1432 if (rsp->flags & FCP_RSP_LEN_VALID)
1433 rsp_code = rsp->data.info.rsp_code;
1434
1435 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1436 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1437 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1438 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1439}
1440
1441/**
1442 * ibmvfc_scsi_done - Handle responses from commands
1443 * @evt: ibmvfc event to be handled
1444 *
1445 * Used as a callback when sending scsi cmds.
1446 **/
1447static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1448{
1449 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1450 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1451 struct scsi_cmnd *cmnd = evt->cmnd;
1452 int rsp_len = 0;
1453 int sense_len = rsp->fcp_sense_len;
1454
1455 if (cmnd) {
1456 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1457 scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1458 else if (rsp->flags & FCP_RESID_UNDER)
1459 scsi_set_resid(cmnd, rsp->fcp_resid);
1460 else
1461 scsi_set_resid(cmnd, 0);
1462
1463 if (vfc_cmd->status) {
1464 cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1465
1466 if (rsp->flags & FCP_RSP_LEN_VALID)
1467 rsp_len = rsp->fcp_rsp_len;
1468 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1469 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1470 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len)
1471 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1472
1473 ibmvfc_log_error(evt);
1474 }
1475
1476 if (!cmnd->result &&
1477 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1478 cmnd->result = (DID_ERROR << 16);
1479
1480 scsi_dma_unmap(cmnd);
1481 cmnd->scsi_done(cmnd);
1482 }
1483
1484 ibmvfc_free_event(evt);
1485}
1486
1487/**
1488 * ibmvfc_host_chkready - Check if the host can accept commands
1489 * @vhost: struct ibmvfc host
1490 *
1491 * Returns:
1492 * 1 if host can accept command / 0 if not
1493 **/
1494static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1495{
1496 int result = 0;
1497
1498 switch (vhost->state) {
1499 case IBMVFC_LINK_DEAD:
1500 case IBMVFC_HOST_OFFLINE:
1501 result = DID_NO_CONNECT << 16;
1502 break;
1503 case IBMVFC_NO_CRQ:
1504 case IBMVFC_INITIALIZING:
1505 case IBMVFC_HALTED:
1506 case IBMVFC_LINK_DOWN:
1507 result = DID_REQUEUE << 16;
1508 break;
1509 case IBMVFC_ACTIVE:
1510 result = 0;
1511 break;
1512 };
1513
1514 return result;
1515}
1516
1517/**
1518 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1519 * @cmnd: struct scsi_cmnd to be executed
1520 * @done: Callback function to be called when cmnd is completed
1521 *
1522 * Returns:
1523 * 0 on success / other on failure
1524 **/
1525static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
1526 void (*done) (struct scsi_cmnd *))
1527{
1528 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1529 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1530 struct ibmvfc_cmd *vfc_cmd;
1531 struct ibmvfc_event *evt;
1532 u8 tag[2];
1533 int rc;
1534
1535 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1536 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1537 cmnd->result = rc;
1538 done(cmnd);
1539 return 0;
1540 }
1541
1542 cmnd->result = (DID_OK << 16);
1543 evt = ibmvfc_get_event(vhost);
1544 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1545 evt->cmnd = cmnd;
1546 cmnd->scsi_done = done;
1547 vfc_cmd = &evt->iu.cmd;
1548 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1549 vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1550 vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1551 vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1552 vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1553 vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1554 vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1555 vfc_cmd->tgt_scsi_id = rport->port_id;
1556 if ((rport->supported_classes & FC_COS_CLASS3) &&
1557 (fc_host_supported_classes(vhost->host) & FC_COS_CLASS3))
1558 vfc_cmd->flags = IBMVFC_CLASS_3_ERR;
1559 vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1560 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1561 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1562
1563 if (scsi_populate_tag_msg(cmnd, tag)) {
1564 vfc_cmd->task_tag = tag[1];
1565 switch (tag[0]) {
1566 case MSG_SIMPLE_TAG:
1567 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1568 break;
1569 case MSG_HEAD_TAG:
1570 vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1571 break;
1572 case MSG_ORDERED_TAG:
1573 vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1574 break;
1575 };
1576 }
1577
1578 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1579 return ibmvfc_send_event(evt, vhost, 0);
1580
1581 ibmvfc_free_event(evt);
1582 if (rc == -ENOMEM)
1583 return SCSI_MLQUEUE_HOST_BUSY;
1584
1585 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1586 scmd_printk(KERN_ERR, cmnd,
1587 "Failed to map DMA buffer for command. rc=%d\n", rc);
1588
1589 cmnd->result = DID_ERROR << 16;
1590 done(cmnd);
1591 return 0;
1592}
1593
1594/**
1595 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1596 * @evt: ibmvfc event struct
1597 *
1598 **/
1599static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1600{
1601 /* copy the response back */
1602 if (evt->sync_iu)
1603 *evt->sync_iu = *evt->xfer_iu;
1604
1605 complete(&evt->comp);
1606}
1607
1608/**
1609 * ibmvfc_reset_device - Reset the device with the specified reset type
1610 * @sdev: scsi device to reset
1611 * @type: reset type
1612 * @desc: reset type description for log messages
1613 *
1614 * Returns:
1615 * 0 on success / other on failure
1616 **/
1617static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1618{
1619 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1620 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1621 struct ibmvfc_cmd *tmf;
1622 struct ibmvfc_event *evt;
1623 union ibmvfc_iu rsp_iu;
1624 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1625 int rsp_rc = -EBUSY;
1626 unsigned long flags;
1627 int rsp_code = 0;
1628
1629 spin_lock_irqsave(vhost->host->host_lock, flags);
1630 if (vhost->state == IBMVFC_ACTIVE) {
1631 evt = ibmvfc_get_event(vhost);
1632 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1633
1634 tmf = &evt->iu.cmd;
1635 memset(tmf, 0, sizeof(*tmf));
1636 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1637 tmf->resp.len = sizeof(tmf->rsp);
1638 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1639 tmf->payload_len = sizeof(tmf->iu);
1640 tmf->resp_len = sizeof(tmf->rsp);
1641 tmf->cancel_key = (unsigned long)sdev->hostdata;
1642 tmf->tgt_scsi_id = rport->port_id;
1643 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1644 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1645 tmf->iu.tmf_flags = type;
1646 evt->sync_iu = &rsp_iu;
1647
1648 init_completion(&evt->comp);
1649 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1650 }
1651 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1652
1653 if (rsp_rc != 0) {
1654 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1655 desc, rsp_rc);
1656 return -EIO;
1657 }
1658
1659 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
1660 wait_for_completion(&evt->comp);
1661
1662 if (rsp_iu.cmd.status) {
1663 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1664 rsp_code = fc_rsp->data.info.rsp_code;
1665
1666 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
1667 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1668 desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1669 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1670 fc_rsp->scsi_status);
1671 rsp_rc = -EIO;
1672 } else
1673 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
1674
1675 spin_lock_irqsave(vhost->host->host_lock, flags);
1676 ibmvfc_free_event(evt);
1677 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1678 return rsp_rc;
1679}
1680
1681/**
1682 * ibmvfc_abort_task_set - Abort outstanding commands to the device
1683 * @sdev: scsi device to abort commands
1684 *
1685 * This sends an Abort Task Set to the VIOS for the specified device. This does
1686 * NOT send any cancel to the VIOS. That must be done separately.
1687 *
1688 * Returns:
1689 * 0 on success / other on failure
1690 **/
1691static int ibmvfc_abort_task_set(struct scsi_device *sdev)
1692{
1693 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1694 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1695 struct ibmvfc_cmd *tmf;
1696 struct ibmvfc_event *evt, *found_evt;
1697 union ibmvfc_iu rsp_iu;
1698 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1699 int rsp_rc = -EBUSY;
1700 unsigned long flags;
1701 int rsp_code = 0;
1702
1703 spin_lock_irqsave(vhost->host->host_lock, flags);
1704 found_evt = NULL;
1705 list_for_each_entry(evt, &vhost->sent, queue) {
1706 if (evt->cmnd && evt->cmnd->device == sdev) {
1707 found_evt = evt;
1708 break;
1709 }
1710 }
1711
1712 if (!found_evt) {
1713 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1714 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
1715 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1716 return 0;
1717 }
1718
1719 if (vhost->state == IBMVFC_ACTIVE) {
1720 evt = ibmvfc_get_event(vhost);
1721 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1722
1723 tmf = &evt->iu.cmd;
1724 memset(tmf, 0, sizeof(*tmf));
1725 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1726 tmf->resp.len = sizeof(tmf->rsp);
1727 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1728 tmf->payload_len = sizeof(tmf->iu);
1729 tmf->resp_len = sizeof(tmf->rsp);
1730 tmf->cancel_key = (unsigned long)sdev->hostdata;
1731 tmf->tgt_scsi_id = rport->port_id;
1732 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1733 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1734 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
1735 evt->sync_iu = &rsp_iu;
1736
1737 init_completion(&evt->comp);
1738 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1739 }
1740
1741 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1742
1743 if (rsp_rc != 0) {
1744 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
1745 return -EIO;
1746 }
1747
1748 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
1749 wait_for_completion(&evt->comp);
1750
1751 if (rsp_iu.cmd.status) {
1752 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1753 rsp_code = fc_rsp->data.info.rsp_code;
1754
1755 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
1756 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1757 ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1758 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1759 fc_rsp->scsi_status);
1760 rsp_rc = -EIO;
1761 } else
1762 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
1763
1764 spin_lock_irqsave(vhost->host->host_lock, flags);
1765 ibmvfc_free_event(evt);
1766 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1767 return rsp_rc;
1768}
1769
1770/**
1771 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
1772 * @sdev: scsi device to cancel commands
1773 * @type: type of error recovery being performed
1774 *
1775 * This sends a cancel to the VIOS for the specified device. This does
1776 * NOT send any abort to the actual device. That must be done separately.
1777 *
1778 * Returns:
1779 * 0 on success / other on failure
1780 **/
1781static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
1782{
1783 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1784 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1785 struct ibmvfc_tmf *tmf;
1786 struct ibmvfc_event *evt, *found_evt;
1787 union ibmvfc_iu rsp;
1788 int rsp_rc = -EBUSY;
1789 unsigned long flags;
1790 u16 status;
1791
1792 ENTER;
1793 spin_lock_irqsave(vhost->host->host_lock, flags);
1794 found_evt = NULL;
1795 list_for_each_entry(evt, &vhost->sent, queue) {
1796 if (evt->cmnd && evt->cmnd->device == sdev) {
1797 found_evt = evt;
1798 break;
1799 }
1800 }
1801
1802 if (!found_evt) {
1803 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1804 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
1805 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1806 return 0;
1807 }
1808
1809 if (vhost->state == IBMVFC_ACTIVE) {
1810 evt = ibmvfc_get_event(vhost);
1811 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1812
1813 tmf = &evt->iu.tmf;
1814 memset(tmf, 0, sizeof(*tmf));
1815 tmf->common.version = 1;
1816 tmf->common.opcode = IBMVFC_TMF_MAD;
1817 tmf->common.length = sizeof(*tmf);
1818 tmf->scsi_id = rport->port_id;
1819 int_to_scsilun(sdev->lun, &tmf->lun);
1820 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
1821 tmf->cancel_key = (unsigned long)sdev->hostdata;
1822 tmf->my_cancel_key = (IBMVFC_TMF_CANCEL_KEY | (unsigned long)sdev->hostdata);
1823
1824 evt->sync_iu = &rsp;
1825 init_completion(&evt->comp);
1826 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1827 }
1828
1829 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1830
1831 if (rsp_rc != 0) {
1832 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
1833 return -EIO;
1834 }
1835
1836 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
1837
1838 wait_for_completion(&evt->comp);
1839 status = rsp.mad_common.status;
1840 spin_lock_irqsave(vhost->host->host_lock, flags);
1841 ibmvfc_free_event(evt);
1842 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1843
1844 if (status != IBMVFC_MAD_SUCCESS) {
1845 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
1846 return -EIO;
1847 }
1848
1849 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
1850 return 0;
1851}
1852
1853/**
1854 * ibmvfc_eh_abort_handler - Abort a command
1855 * @cmd: scsi command to abort
1856 *
1857 * Returns:
1858 * SUCCESS / FAILED
1859 **/
1860static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
1861{
1862 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1863 struct ibmvfc_event *evt, *pos;
1864 int cancel_rc, abort_rc;
1865 unsigned long flags;
1866
1867 ENTER;
1868 ibmvfc_wait_while_resetting(vhost);
1869 cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_ABORT_TASK_SET);
1870 abort_rc = ibmvfc_abort_task_set(cmd->device);
1871
1872 if (!cancel_rc && !abort_rc) {
1873 spin_lock_irqsave(vhost->host->host_lock, flags);
1874 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1875 if (evt->cmnd && evt->cmnd->device == cmd->device)
1876 ibmvfc_fail_request(evt, DID_ABORT);
1877 }
1878 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1879 LEAVE;
1880 return SUCCESS;
1881 }
1882
1883 LEAVE;
1884 return FAILED;
1885}
1886
1887/**
1888 * ibmvfc_eh_device_reset_handler - Reset a single LUN
1889 * @cmd: scsi command struct
1890 *
1891 * Returns:
1892 * SUCCESS / FAILED
1893 **/
1894static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
1895{
1896 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1897 struct ibmvfc_event *evt, *pos;
1898 int cancel_rc, reset_rc;
1899 unsigned long flags;
1900
1901 ENTER;
1902 ibmvfc_wait_while_resetting(vhost);
1903 cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_LUN_RESET);
1904 reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_LUN_RESET, "LUN");
1905
1906 if (!cancel_rc && !reset_rc) {
1907 spin_lock_irqsave(vhost->host->host_lock, flags);
1908 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1909 if (evt->cmnd && evt->cmnd->device == cmd->device)
1910 ibmvfc_fail_request(evt, DID_ABORT);
1911 }
1912 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1913 LEAVE;
1914 return SUCCESS;
1915 }
1916
1917 LEAVE;
1918 return FAILED;
1919}
1920
1921/**
1922 * ibmvfc_dev_cancel_all - Device iterated cancel all function
1923 * @sdev: scsi device struct
1924 * @data: return code
1925 *
1926 **/
1927static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
1928{
1929 unsigned long *rc = data;
1930 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
1931}
1932
1933/**
1934 * ibmvfc_dev_abort_all - Device iterated abort task set function
1935 * @sdev: scsi device struct
1936 * @data: return code
1937 *
1938 **/
1939static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
1940{
1941 unsigned long *rc = data;
1942 *rc |= ibmvfc_abort_task_set(sdev);
1943}
1944
1945/**
1946 * ibmvfc_eh_target_reset_handler - Reset the target
1947 * @cmd: scsi command struct
1948 *
1949 * Returns:
1950 * SUCCESS / FAILED
1951 **/
1952static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
1953{
1954 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1955 struct scsi_target *starget = scsi_target(cmd->device);
1956 struct ibmvfc_event *evt, *pos;
1957 int reset_rc;
1958 unsigned long cancel_rc = 0;
1959 unsigned long flags;
1960
1961 ENTER;
1962 ibmvfc_wait_while_resetting(vhost);
1963 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
1964 reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_TARGET_RESET, "target");
1965
1966 if (!cancel_rc && !reset_rc) {
1967 spin_lock_irqsave(vhost->host->host_lock, flags);
1968 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1969 if (evt->cmnd && scsi_target(evt->cmnd->device) == starget)
1970 ibmvfc_fail_request(evt, DID_ABORT);
1971 }
1972 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1973 LEAVE;
1974 return SUCCESS;
1975 }
1976
1977 LEAVE;
1978 return FAILED;
1979}
1980
1981/**
1982 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
1983 * @cmd: struct scsi_cmnd having problems
1984 *
1985 **/
1986static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
1987{
1988 int rc;
1989 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1990
1991 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
1992 rc = ibmvfc_issue_fc_host_lip(vhost->host);
1993 return rc ? FAILED : SUCCESS;
1994}
1995
1996/**
1997 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
1998 * @rport: rport struct
1999 *
2000 * Return value:
2001 * none
2002 **/
2003static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2004{
2005 struct scsi_target *starget = to_scsi_target(&rport->dev);
2006 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2007 struct ibmvfc_host *vhost = shost_priv(shost);
2008 struct ibmvfc_event *evt, *pos;
2009 unsigned long cancel_rc = 0;
2010 unsigned long abort_rc = 0;
2011 unsigned long flags;
2012
2013 ENTER;
2014 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
2015 starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
2016
2017 if (!cancel_rc && !abort_rc) {
2018 spin_lock_irqsave(shost->host_lock, flags);
2019 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
2020 if (evt->cmnd && scsi_target(evt->cmnd->device) == starget)
2021 ibmvfc_fail_request(evt, DID_ABORT);
2022 }
2023 spin_unlock_irqrestore(shost->host_lock, flags);
2024 } else
2025 ibmvfc_issue_fc_host_lip(shost);
2026
2027 scsi_target_unblock(&rport->dev);
2028 LEAVE;
2029}
2030
2031static const struct {
2032 enum ibmvfc_async_event ae;
2033 const char *desc;
2034} ae_desc [] = {
2035 { IBMVFC_AE_ELS_PLOGI, "PLOGI" },
2036 { IBMVFC_AE_ELS_LOGO, "LOGO" },
2037 { IBMVFC_AE_ELS_PRLO, "PRLO" },
2038 { IBMVFC_AE_SCN_NPORT, "N-Port SCN" },
2039 { IBMVFC_AE_SCN_GROUP, "Group SCN" },
2040 { IBMVFC_AE_SCN_DOMAIN, "Domain SCN" },
2041 { IBMVFC_AE_SCN_FABRIC, "Fabric SCN" },
2042 { IBMVFC_AE_LINK_UP, "Link Up" },
2043 { IBMVFC_AE_LINK_DOWN, "Link Down" },
2044 { IBMVFC_AE_LINK_DEAD, "Link Dead" },
2045 { IBMVFC_AE_HALT, "Halt" },
2046 { IBMVFC_AE_RESUME, "Resume" },
2047 { IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" },
2048};
2049
2050static const char *unknown_ae = "Unknown async";
2051
2052/**
2053 * ibmvfc_get_ae_desc - Get text description for async event
2054 * @ae: async event
2055 *
2056 **/
2057static const char *ibmvfc_get_ae_desc(u64 ae)
2058{
2059 int i;
2060
2061 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2062 if (ae_desc[i].ae == ae)
2063 return ae_desc[i].desc;
2064
2065 return unknown_ae;
2066}
2067
2068/**
2069 * ibmvfc_handle_async - Handle an async event from the adapter
2070 * @crq: crq to process
2071 * @vhost: ibmvfc host struct
2072 *
2073 **/
2074static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2075 struct ibmvfc_host *vhost)
2076{
2077 const char *desc = ibmvfc_get_ae_desc(crq->event);
2078
0ae808e0 2079 ibmvfc_log(vhost, 3, "%s event received\n", desc);
072b91f9
BK		 2080
2081 switch (crq->event) {
2082 case IBMVFC_AE_LINK_UP:
2083 case IBMVFC_AE_RESUME:
2084 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2085 ibmvfc_init_host(vhost);
2086 break;
2087 case IBMVFC_AE_SCN_FABRIC:
2088 vhost->events_to_log |= IBMVFC_AE_RSCN;
2089 ibmvfc_init_host(vhost);
2090 break;
2091 case IBMVFC_AE_SCN_NPORT:
2092 case IBMVFC_AE_SCN_GROUP:
2093 case IBMVFC_AE_SCN_DOMAIN:
2094 vhost->events_to_log |= IBMVFC_AE_RSCN;
2095 case IBMVFC_AE_ELS_LOGO:
2096 case IBMVFC_AE_ELS_PRLO:
2097 case IBMVFC_AE_ELS_PLOGI:
2098 ibmvfc_reinit_host(vhost);
2099 break;
2100 case IBMVFC_AE_LINK_DOWN:
2101 case IBMVFC_AE_ADAPTER_FAILED:
2102 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2103 break;
2104 case IBMVFC_AE_LINK_DEAD:
2105 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2106 break;
2107 case IBMVFC_AE_HALT:
2108 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2109 break;
2110 default:
2111 dev_err(vhost->dev, "Unknown async event received: %ld\n", crq->event);
2112 break;
2113 };
2114}
2115
2116/**
2117 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2118 * @crq: Command/Response queue
2119 * @vhost: ibmvfc host struct
2120 *
2121 **/
2122static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2123{
2124 long rc;
2125 struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2126
2127 switch (crq->valid) {
2128 case IBMVFC_CRQ_INIT_RSP:
2129 switch (crq->format) {
2130 case IBMVFC_CRQ_INIT:
2131 dev_info(vhost->dev, "Partner initialized\n");
2132 /* Send back a response */
2133 rc = ibmvfc_send_crq_init_complete(vhost);
2134 if (rc == 0)
2135 ibmvfc_init_host(vhost);
2136 else
2137 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2138 break;
2139 case IBMVFC_CRQ_INIT_COMPLETE:
2140 dev_info(vhost->dev, "Partner initialization complete\n");
2141 ibmvfc_init_host(vhost);
2142 break;
2143 default:
2144 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2145 }
2146 return;
2147 case IBMVFC_CRQ_XPORT_EVENT:
2148 vhost->state = IBMVFC_NO_CRQ;
2149 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2150 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2151 /* We need to re-setup the interpartition connection */
2152 dev_info(vhost->dev, "Re-enabling adapter\n");
2153 vhost->client_migrated = 1;
2154 ibmvfc_purge_requests(vhost, DID_REQUEUE);
2155 if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
2156 (rc = ibmvfc_send_crq_init(vhost))) {
2157 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2158 dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
2159 } else
2160 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2161 } else {
2162 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2163
2164 ibmvfc_purge_requests(vhost, DID_ERROR);
2165 if ((rc = ibmvfc_reset_crq(vhost)) ||
2166 (rc = ibmvfc_send_crq_init(vhost))) {
2167 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2168 dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
2169 } else
2170 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2171 }
2172 return;
2173 case IBMVFC_CRQ_CMD_RSP:
2174 break;
2175 default:
2176 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2177 return;
2178 }
2179
2180 if (crq->format == IBMVFC_ASYNC_EVENT)
2181 return;
2182
2183 /* The only kind of payload CRQs we should get are responses to
2184 * things we send. Make sure this response is to something we
2185 * actually sent
2186 */
2187 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2188 dev_err(vhost->dev, "Returned correlation_token 0x%08lx is invalid!\n",
2189 crq->ioba);
2190 return;
2191 }
2192
2193 if (unlikely(atomic_read(&evt->free))) {
2194 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08lx!\n",
2195 crq->ioba);
2196 return;
2197 }
2198
2199 del_timer(&evt->timer);
2200 list_del(&evt->queue);
2201 ibmvfc_trc_end(evt);
2202 evt->done(evt);
2203}
2204
2205/**
2206 * ibmvfc_scan_finished - Check if the device scan is done.
2207 * @shost: scsi host struct
2208 * @time: current elapsed time
2209 *
2210 * Returns:
2211 * 0 if scan is not done / 1 if scan is done
2212 **/
2213static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2214{
2215 unsigned long flags;
2216 struct ibmvfc_host *vhost = shost_priv(shost);
2217 int done = 0;
2218
2219 spin_lock_irqsave(shost->host_lock, flags);
2220 if (time >= (init_timeout * HZ)) {
2221 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2222 "continuing initialization\n", init_timeout);
2223 done = 1;
2224 }
2225
2226 if (vhost->state != IBMVFC_NO_CRQ && vhost->action == IBMVFC_HOST_ACTION_NONE)
2227 done = 1;
2228 spin_unlock_irqrestore(shost->host_lock, flags);
2229 return done;
2230}
2231
2232/**
2233 * ibmvfc_slave_alloc - Setup the device's task set value
2234 * @sdev: struct scsi_device device to configure
2235 *
2236 * Set the device's task set value so that error handling works as
2237 * expected.
2238 *
2239 * Returns:
2240 * 0 on success / -ENXIO if device does not exist
2241 **/
2242static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2243{
2244 struct Scsi_Host *shost = sdev->host;
2245 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2246 struct ibmvfc_host *vhost = shost_priv(shost);
2247 unsigned long flags = 0;
2248
2249 if (!rport || fc_remote_port_chkready(rport))
2250 return -ENXIO;
2251
2252 spin_lock_irqsave(shost->host_lock, flags);
2253 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2254 spin_unlock_irqrestore(shost->host_lock, flags);
2255 return 0;
2256}
2257
2258/**
2259 * ibmvfc_slave_configure - Configure the device
2260 * @sdev: struct scsi_device device to configure
2261 *
2262 * Enable allow_restart for a device if it is a disk. Adjust the
2263 * queue_depth here also.
2264 *
2265 * Returns:
2266 * 0
2267 **/
2268static int ibmvfc_slave_configure(struct scsi_device *sdev)
2269{
2270 struct Scsi_Host *shost = sdev->host;
2271 struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
2272 unsigned long flags = 0;
2273
2274 spin_lock_irqsave(shost->host_lock, flags);
2275 if (sdev->type == TYPE_DISK)
2276 sdev->allow_restart = 1;
2277
2278 if (sdev->tagged_supported) {
2279 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2280 scsi_activate_tcq(sdev, sdev->queue_depth);
2281 } else
2282 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2283
2284 rport->dev_loss_tmo = dev_loss_tmo;
2285 spin_unlock_irqrestore(shost->host_lock, flags);
2286 return 0;
2287}
2288
2289/**
2290 * ibmvfc_change_queue_depth - Change the device's queue depth
2291 * @sdev: scsi device struct
2292 * @qdepth: depth to set
2293 *
2294 * Return value:
2295 * actual depth set
2296 **/
2297static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2298{
2299 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2300 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2301
2302 scsi_adjust_queue_depth(sdev, 0, qdepth);
2303 return sdev->queue_depth;
2304}
2305
2306/**
2307 * ibmvfc_change_queue_type - Change the device's queue type
2308 * @sdev: scsi device struct
2309 * @tag_type: type of tags to use
2310 *
2311 * Return value:
2312 * actual queue type set
2313 **/
2314static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2315{
2316 if (sdev->tagged_supported) {
2317 scsi_set_tag_type(sdev, tag_type);
2318
2319 if (tag_type)
2320 scsi_activate_tcq(sdev, sdev->queue_depth);
2321 else
2322 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2323 } else
2324 tag_type = 0;
2325
2326 return tag_type;
2327}
2328
2329static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2330 struct device_attribute *attr, char *buf)
2331{
2332 struct Scsi_Host *shost = class_to_shost(dev);
2333 struct ibmvfc_host *vhost = shost_priv(shost);
2334
2335 return snprintf(buf, PAGE_SIZE, "%s\n",
2336 vhost->login_buf->resp.partition_name);
2337}
2338
2339static struct device_attribute ibmvfc_host_partition_name = {
2340 .attr = {
2341 .name = "partition_name",
2342 .mode = S_IRUGO,
2343 },
2344 .show = ibmvfc_show_host_partition_name,
2345};
2346
2347static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2348 struct device_attribute *attr, char *buf)
2349{
2350 struct Scsi_Host *shost = class_to_shost(dev);
2351 struct ibmvfc_host *vhost = shost_priv(shost);
2352
2353 return snprintf(buf, PAGE_SIZE, "%s\n",
2354 vhost->login_buf->resp.device_name);
2355}
2356
2357static struct device_attribute ibmvfc_host_device_name = {
2358 .attr = {
2359 .name = "device_name",
2360 .mode = S_IRUGO,
2361 },
2362 .show = ibmvfc_show_host_device_name,
2363};
2364
2365static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2366 struct device_attribute *attr, char *buf)
2367{
2368 struct Scsi_Host *shost = class_to_shost(dev);
2369 struct ibmvfc_host *vhost = shost_priv(shost);
2370
2371 return snprintf(buf, PAGE_SIZE, "%s\n",
2372 vhost->login_buf->resp.port_loc_code);
2373}
2374
2375static struct device_attribute ibmvfc_host_loc_code = {
2376 .attr = {
2377 .name = "port_loc_code",
2378 .mode = S_IRUGO,
2379 },
2380 .show = ibmvfc_show_host_loc_code,
2381};
2382
2383static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2384 struct device_attribute *attr, char *buf)
2385{
2386 struct Scsi_Host *shost = class_to_shost(dev);
2387 struct ibmvfc_host *vhost = shost_priv(shost);
2388
2389 return snprintf(buf, PAGE_SIZE, "%s\n",
2390 vhost->login_buf->resp.drc_name);
2391}
2392
2393static struct device_attribute ibmvfc_host_drc_name = {
2394 .attr = {
2395 .name = "drc_name",
2396 .mode = S_IRUGO,
2397 },
2398 .show = ibmvfc_show_host_drc_name,
2399};
2400
2401static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2402 struct device_attribute *attr, char *buf)
2403{
2404 struct Scsi_Host *shost = class_to_shost(dev);
2405 struct ibmvfc_host *vhost = shost_priv(shost);
2406 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2407}
2408
2409static struct device_attribute ibmvfc_host_npiv_version = {
2410 .attr = {
2411 .name = "npiv_version",
2412 .mode = S_IRUGO,
2413 },
2414 .show = ibmvfc_show_host_npiv_version,
2415};
2416
2417/**
2418 * ibmvfc_show_log_level - Show the adapter's error logging level
2419 * @dev: class device struct
2420 * @buf: buffer
2421 *
2422 * Return value:
2423 * number of bytes printed to buffer
2424 **/
2425static ssize_t ibmvfc_show_log_level(struct device *dev,
2426 struct device_attribute *attr, char *buf)
2427{
2428 struct Scsi_Host *shost = class_to_shost(dev);
2429 struct ibmvfc_host *vhost = shost_priv(shost);
2430 unsigned long flags = 0;
2431 int len;
2432
2433 spin_lock_irqsave(shost->host_lock, flags);
2434 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2435 spin_unlock_irqrestore(shost->host_lock, flags);
2436 return len;
2437}
2438
2439/**
2440 * ibmvfc_store_log_level - Change the adapter's error logging level
2441 * @dev: class device struct
2442 * @buf: buffer
2443 *
2444 * Return value:
2445 * number of bytes printed to buffer
2446 **/
2447static ssize_t ibmvfc_store_log_level(struct device *dev,
2448 struct device_attribute *attr,
2449 const char *buf, size_t count)
2450{
2451 struct Scsi_Host *shost = class_to_shost(dev);
2452 struct ibmvfc_host *vhost = shost_priv(shost);
2453 unsigned long flags = 0;
2454
2455 spin_lock_irqsave(shost->host_lock, flags);
2456 vhost->log_level = simple_strtoul(buf, NULL, 10);
2457 spin_unlock_irqrestore(shost->host_lock, flags);
2458 return strlen(buf);
2459}
2460
2461static struct device_attribute ibmvfc_log_level_attr = {
2462 .attr = {
2463 .name = "log_level",
2464 .mode = S_IRUGO | S_IWUSR,
2465 },
2466 .show = ibmvfc_show_log_level,
2467 .store = ibmvfc_store_log_level
2468};
2469
2470#ifdef CONFIG_SCSI_IBMVFC_TRACE
2471/**
2472 * ibmvfc_read_trace - Dump the adapter trace
2473 * @kobj: kobject struct
2474 * @bin_attr: bin_attribute struct
2475 * @buf: buffer
2476 * @off: offset
2477 * @count: buffer size
2478 *
2479 * Return value:
2480 * number of bytes printed to buffer
2481 **/
2482static ssize_t ibmvfc_read_trace(struct kobject *kobj,
2483 struct bin_attribute *bin_attr,
2484 char *buf, loff_t off, size_t count)
2485{
2486 struct device *dev = container_of(kobj, struct device, kobj);
2487 struct Scsi_Host *shost = class_to_shost(dev);
2488 struct ibmvfc_host *vhost = shost_priv(shost);
2489 unsigned long flags = 0;
2490 int size = IBMVFC_TRACE_SIZE;
2491 char *src = (char *)vhost->trace;
2492
2493 if (off > size)
2494 return 0;
2495 if (off + count > size) {
2496 size -= off;
2497 count = size;
2498 }
2499
2500 spin_lock_irqsave(shost->host_lock, flags);
2501 memcpy(buf, &src[off], count);
2502 spin_unlock_irqrestore(shost->host_lock, flags);
2503 return count;
2504}
2505
2506static struct bin_attribute ibmvfc_trace_attr = {
2507 .attr = {
2508 .name = "trace",
2509 .mode = S_IRUGO,
2510 },
2511 .size = 0,
2512 .read = ibmvfc_read_trace,
2513};
2514#endif
2515
2516static struct device_attribute *ibmvfc_attrs[] = {
2517 &ibmvfc_host_partition_name,
2518 &ibmvfc_host_device_name,
2519 &ibmvfc_host_loc_code,
2520 &ibmvfc_host_drc_name,
2521 &ibmvfc_host_npiv_version,
2522 &ibmvfc_log_level_attr,
2523 NULL
2524};
2525
2526static struct scsi_host_template driver_template = {
2527 .module = THIS_MODULE,
2528 .name = "IBM POWER Virtual FC Adapter",
2529 .proc_name = IBMVFC_NAME,
2530 .queuecommand = ibmvfc_queuecommand,
2531 .eh_abort_handler = ibmvfc_eh_abort_handler,
2532 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
2533 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
2534 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
2535 .slave_alloc = ibmvfc_slave_alloc,
2536 .slave_configure = ibmvfc_slave_configure,
2537 .scan_finished = ibmvfc_scan_finished,
2538 .change_queue_depth = ibmvfc_change_queue_depth,
2539 .change_queue_type = ibmvfc_change_queue_type,
2540 .cmd_per_lun = 16,
2541 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
2542 .this_id = -1,
2543 .sg_tablesize = SG_ALL,
2544 .max_sectors = IBMVFC_MAX_SECTORS,
2545 .use_clustering = ENABLE_CLUSTERING,
2546 .shost_attrs = ibmvfc_attrs,
2547};
2548
2549/**
2550 * ibmvfc_next_async_crq - Returns the next entry in async queue
2551 * @vhost: ibmvfc host struct
2552 *
2553 * Returns:
2554 * Pointer to next entry in queue / NULL if empty
2555 **/
2556static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
2557{
2558 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
2559 struct ibmvfc_async_crq *crq;
2560
2561 crq = &async_crq->msgs[async_crq->cur];
2562 if (crq->valid & 0x80) {
2563 if (++async_crq->cur == async_crq->size)
2564 async_crq->cur = 0;
2565 } else
2566 crq = NULL;
2567
2568 return crq;
2569}
2570
2571/**
2572 * ibmvfc_next_crq - Returns the next entry in message queue
2573 * @vhost: ibmvfc host struct
2574 *
2575 * Returns:
2576 * Pointer to next entry in queue / NULL if empty
2577 **/
2578static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
2579{
2580 struct ibmvfc_crq_queue *queue = &vhost->crq;
2581 struct ibmvfc_crq *crq;
2582
2583 crq = &queue->msgs[queue->cur];
2584 if (crq->valid & 0x80) {
2585 if (++queue->cur == queue->size)
2586 queue->cur = 0;
2587 } else
2588 crq = NULL;
2589
2590 return crq;
2591}
2592
2593/**
2594 * ibmvfc_interrupt - Interrupt handler
2595 * @irq: number of irq to handle, not used
2596 * @dev_instance: ibmvfc_host that received interrupt
2597 *
2598 * Returns:
2599 * IRQ_HANDLED
2600 **/
2601static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
2602{
2603 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
2604 struct vio_dev *vdev = to_vio_dev(vhost->dev);
2605 struct ibmvfc_crq *crq;
2606 struct ibmvfc_async_crq *async;
2607 unsigned long flags;
2608 int done = 0;
2609
2610 spin_lock_irqsave(vhost->host->host_lock, flags);
2611 vio_disable_interrupts(to_vio_dev(vhost->dev));
2612 while (!done) {
2613 /* Pull all the valid messages off the CRQ */
2614 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2615 ibmvfc_handle_crq(crq, vhost);
2616 crq->valid = 0;
2617 }
2618
2619 /* Pull all the valid messages off the async CRQ */
2620 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2621 ibmvfc_handle_async(async, vhost);
2622 async->valid = 0;
2623 }
2624
2625 vio_enable_interrupts(vdev);
2626 if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2627 vio_disable_interrupts(vdev);
2628 ibmvfc_handle_crq(crq, vhost);
2629 crq->valid = 0;
2630 } else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2631 vio_disable_interrupts(vdev);
2632 ibmvfc_handle_async(async, vhost);
2633 crq->valid = 0;
2634 } else
2635 done = 1;
2636 }
2637
2638 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2639 return IRQ_HANDLED;
2640}
2641
2642/**
2643 * ibmvfc_init_tgt - Set the next init job step for the target
2644 * @tgt: ibmvfc target struct
2645 * @job_step: job step to perform
2646 *
2647 **/
2648static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
2649 void (*job_step) (struct ibmvfc_target *))
2650{
2651 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
2652 tgt->job_step = job_step;
2653 wake_up(&tgt->vhost->work_wait_q);
2654}
2655
2656/**
2657 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
2658 * @tgt: ibmvfc target struct
2659 * @job_step: initialization job step
2660 *
2661 **/
2662static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
2663 void (*job_step) (struct ibmvfc_target *))
2664{
2665 if (++tgt->init_retries > IBMVFC_MAX_INIT_RETRIES) {
2666 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2667 wake_up(&tgt->vhost->work_wait_q);
2668 } else
2669 ibmvfc_init_tgt(tgt, job_step);
2670}
2671
072b91f9
BK		 2672/**
2673 * ibmvfc_tgt_prli_done - Completion handler for Process Login
2674 * @evt: ibmvfc event struct
2675 *
2676 **/
2677static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
2678{
2679 struct ibmvfc_target *tgt = evt->tgt;
2680 struct ibmvfc_host *vhost = evt->vhost;
2681 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
2682 u32 status = rsp->common.status;
2683
2684 vhost->discovery_threads--;
2685 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2686 switch (status) {
2687 case IBMVFC_MAD_SUCCESS:
2688 tgt_dbg(tgt, "Process Login succeeded\n");
2689 tgt->need_login = 0;
2690 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_ADD_RPORT);
2691 break;
2692 case IBMVFC_MAD_DRIVER_FAILED:
2693 break;
2694 case IBMVFC_MAD_CRQ_ERROR:
2695 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2696 break;
2697 case IBMVFC_MAD_FAILED:
2698 default:
2699 tgt_err(tgt, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
2700 ibmvfc_get_cmd_error(rsp->status, rsp->error),
2701 rsp->status, rsp->error, status);
2702 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2703 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2704 break;
2705 };
2706
2707 kref_put(&tgt->kref, ibmvfc_release_tgt);
2708 ibmvfc_free_event(evt);
2709 wake_up(&vhost->work_wait_q);
2710}
2711
2712/**
2713 * ibmvfc_tgt_send_prli - Send a process login
2714 * @tgt: ibmvfc target struct
2715 *
2716 **/
2717static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
2718{
2719 struct ibmvfc_process_login *prli;
2720 struct ibmvfc_host *vhost = tgt->vhost;
2721 struct ibmvfc_event *evt;
2722
2723 if (vhost->discovery_threads >= disc_threads)
2724 return;
2725
2726 kref_get(&tgt->kref);
2727 evt = ibmvfc_get_event(vhost);
2728 vhost->discovery_threads++;
2729 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
2730 evt->tgt = tgt;
2731 prli = &evt->iu.prli;
2732 memset(prli, 0, sizeof(*prli));
2733 prli->common.version = 1;
2734 prli->common.opcode = IBMVFC_PROCESS_LOGIN;
2735 prli->common.length = sizeof(*prli);
2736 prli->scsi_id = tgt->scsi_id;
2737
2738 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
2739 prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
2740 prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
2741
2742 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2743 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2744 vhost->discovery_threads--;
2745 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2746 kref_put(&tgt->kref, ibmvfc_release_tgt);
2747 } else
2748 tgt_dbg(tgt, "Sent process login\n");
2749}
2750
2751/**
2752 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
2753 * @evt: ibmvfc event struct
2754 *
2755 **/
2756static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
2757{
2758 struct ibmvfc_target *tgt = evt->tgt;
2759 struct ibmvfc_host *vhost = evt->vhost;
2760 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
2761 u32 status = rsp->common.status;
2762
2763 vhost->discovery_threads--;
2764 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2765 switch (status) {
2766 case IBMVFC_MAD_SUCCESS:
2767 tgt_dbg(tgt, "Port Login succeeded\n");
2768 if (tgt->ids.port_name &&
2769 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
2770 vhost->reinit = 1;
2771 tgt_dbg(tgt, "Port re-init required\n");
2772 break;
2773 }
2774 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
2775 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
2776 tgt->ids.port_id = tgt->scsi_id;
2777 tgt->ids.roles = FC_PORT_ROLE_FCP_TARGET;
2778 memcpy(&tgt->service_parms, &rsp->service_parms,
2779 sizeof(tgt->service_parms));
2780 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
2781 sizeof(tgt->service_parms_change));
2782 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
2783 break;
2784 case IBMVFC_MAD_DRIVER_FAILED:
2785 break;
2786 case IBMVFC_MAD_CRQ_ERROR:
2787 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2788 break;
2789 case IBMVFC_MAD_FAILED:
2790 default:
2791 tgt_err(tgt, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
2792 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
2793 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
2794 ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
2795
2796 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2797 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2798 break;
2799 };
2800
2801 kref_put(&tgt->kref, ibmvfc_release_tgt);
2802 ibmvfc_free_event(evt);
2803 wake_up(&vhost->work_wait_q);
2804}
2805
2806/**
2807 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
2808 * @tgt: ibmvfc target struct
2809 *
2810 **/
2811static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
2812{
2813 struct ibmvfc_port_login *plogi;
2814 struct ibmvfc_host *vhost = tgt->vhost;
2815 struct ibmvfc_event *evt;
2816
2817 if (vhost->discovery_threads >= disc_threads)
2818 return;
2819
2820 kref_get(&tgt->kref);
2821 evt = ibmvfc_get_event(vhost);
2822 vhost->discovery_threads++;
2823 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2824 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
2825 evt->tgt = tgt;
2826 plogi = &evt->iu.plogi;
2827 memset(plogi, 0, sizeof(*plogi));
2828 plogi->common.version = 1;
2829 plogi->common.opcode = IBMVFC_PORT_LOGIN;
2830 plogi->common.length = sizeof(*plogi);
2831 plogi->scsi_id = tgt->scsi_id;
2832
2833 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2834 vhost->discovery_threads--;
2835 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2836 kref_put(&tgt->kref, ibmvfc_release_tgt);
2837 } else
2838 tgt_dbg(tgt, "Sent port login\n");
2839}
2840
2841/**
2842 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
2843 * @evt: ibmvfc event struct
2844 *
2845 **/
2846static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
2847{
2848 struct ibmvfc_target *tgt = evt->tgt;
2849 struct ibmvfc_host *vhost = evt->vhost;
2850 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
2851 u32 status = rsp->common.status;
2852
2853 vhost->discovery_threads--;
2854 ibmvfc_free_event(evt);
2855 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2856
2857 switch (status) {
2858 case IBMVFC_MAD_SUCCESS:
2859 tgt_dbg(tgt, "Implicit Logout succeeded\n");
2860 break;
2861 case IBMVFC_MAD_DRIVER_FAILED:
2862 kref_put(&tgt->kref, ibmvfc_release_tgt);
2863 wake_up(&vhost->work_wait_q);
2864 return;
2865 case IBMVFC_MAD_FAILED:
2866 default:
2867 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
2868 break;
2869 };
2870
2871 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
2872 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
2873 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
2874 tgt->scsi_id != tgt->new_scsi_id)
2875 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2876 kref_put(&tgt->kref, ibmvfc_release_tgt);
2877 wake_up(&vhost->work_wait_q);
2878}
2879
2880/**
2881 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
2882 * @tgt: ibmvfc target struct
2883 *
2884 **/
2885static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
2886{
2887 struct ibmvfc_implicit_logout *mad;
2888 struct ibmvfc_host *vhost = tgt->vhost;
2889 struct ibmvfc_event *evt;
2890
2891 if (vhost->discovery_threads >= disc_threads)
2892 return;
2893
2894 kref_get(&tgt->kref);
2895 evt = ibmvfc_get_event(vhost);
2896 vhost->discovery_threads++;
2897 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
2898 evt->tgt = tgt;
2899 mad = &evt->iu.implicit_logout;
2900 memset(mad, 0, sizeof(*mad));
2901 mad->common.version = 1;
2902 mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
2903 mad->common.length = sizeof(*mad);
2904 mad->old_scsi_id = tgt->scsi_id;
2905
2906 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2907 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2908 vhost->discovery_threads--;
2909 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2910 kref_put(&tgt->kref, ibmvfc_release_tgt);
2911 } else
2912 tgt_dbg(tgt, "Sent Implicit Logout\n");
2913}
2914
2915/**
2916 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
2917 * @evt: ibmvfc event struct
2918 *
2919 **/
2920static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
2921{
2922 struct ibmvfc_target *tgt = evt->tgt;
2923 struct ibmvfc_host *vhost = evt->vhost;
2924 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
2925 u32 status = rsp->common.status;
2926
2927 vhost->discovery_threads--;
2928 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2929 switch (status) {
2930 case IBMVFC_MAD_SUCCESS:
2931 tgt_dbg(tgt, "Query Target succeeded\n");
2932 tgt->new_scsi_id = rsp->scsi_id;
2933 if (rsp->scsi_id != tgt->scsi_id)
2934 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
2935 break;
2936 case IBMVFC_MAD_DRIVER_FAILED:
2937 break;
2938 case IBMVFC_MAD_CRQ_ERROR:
2939 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
2940 break;
2941 case IBMVFC_MAD_FAILED:
2942 default:
2943 tgt_err(tgt, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
2944 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
2945 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
2946 ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
2947
2948 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
2949 rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
2950 rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
2951 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2952 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2953 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
2954 break;
2955 };
2956
2957 kref_put(&tgt->kref, ibmvfc_release_tgt);
2958 ibmvfc_free_event(evt);
2959 wake_up(&vhost->work_wait_q);
2960}
2961
2962/**
2963 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
2964 * @tgt: ibmvfc target struct
2965 *
2966 **/
2967static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
2968{
2969 struct ibmvfc_query_tgt *query_tgt;
2970 struct ibmvfc_host *vhost = tgt->vhost;
2971 struct ibmvfc_event *evt;
2972
2973 if (vhost->discovery_threads >= disc_threads)
2974 return;
2975
2976 kref_get(&tgt->kref);
2977 evt = ibmvfc_get_event(vhost);
2978 vhost->discovery_threads++;
2979 evt->tgt = tgt;
2980 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
2981 query_tgt = &evt->iu.query_tgt;
2982 memset(query_tgt, 0, sizeof(*query_tgt));
2983 query_tgt->common.version = 1;
2984 query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
2985 query_tgt->common.length = sizeof(*query_tgt);
2986 query_tgt->wwpn = tgt->ids.port_name;
2987
2988 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2989 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2990 vhost->discovery_threads--;
2991 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2992 kref_put(&tgt->kref, ibmvfc_release_tgt);
2993 } else
2994 tgt_dbg(tgt, "Sent Query Target\n");
2995}
2996
2997/**
2998 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
2999 * @vhost: ibmvfc host struct
3000 * @scsi_id: SCSI ID to allocate target for
3001 *
3002 * Returns:
3003 * 0 on success / other on failure
3004 **/
3005static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3006{
3007 struct ibmvfc_target *tgt;
3008 unsigned long flags;
3009
3010 spin_lock_irqsave(vhost->host->host_lock, flags);
3011 list_for_each_entry(tgt, &vhost->targets, queue) {
3012 if (tgt->scsi_id == scsi_id) {
3013 if (tgt->need_login)
3014 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3015 goto unlock_out;
3016 }
3017 }
3018 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3019
3020 tgt = mempool_alloc(vhost->tgt_pool, GFP_KERNEL);
3021 if (!tgt) {
3022 dev_err(vhost->dev, "Target allocation failure for scsi id %08lx\n",
3023 scsi_id);
3024 return -ENOMEM;
3025 }
3026
3027 tgt->scsi_id = scsi_id;
3028 tgt->new_scsi_id = scsi_id;
3029 tgt->vhost = vhost;
3030 tgt->need_login = 1;
3031 kref_init(&tgt->kref);
3032 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3033 spin_lock_irqsave(vhost->host->host_lock, flags);
3034 list_add_tail(&tgt->queue, &vhost->targets);
3035
3036unlock_out:
3037 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3038 return 0;
3039}
3040
3041/**
3042 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3043 * @vhost: ibmvfc host struct
3044 *
3045 * Returns:
3046 * 0 on success / other on failure
3047 **/
3048static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3049{
3050 int i, rc;
3051
3052 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3053 rc = ibmvfc_alloc_target(vhost,
3054 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3055
3056 return rc;
3057}
3058
3059/**
3060 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3061 * @evt: ibmvfc event struct
3062 *
3063 **/
3064static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3065{
3066 struct ibmvfc_host *vhost = evt->vhost;
3067 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3068 u32 mad_status = rsp->common.status;
3069
3070 switch (mad_status) {
3071 case IBMVFC_MAD_SUCCESS:
3072 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3073 vhost->num_targets = rsp->num_written;
3074 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3075 break;
3076 case IBMVFC_MAD_FAILED:
3077 dev_err(vhost->dev, "Discover Targets failed: %s (%x:%x)\n",
3078 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3079 ibmvfc_retry_host_init(vhost);
3080 break;
3081 case IBMVFC_MAD_DRIVER_FAILED:
3082 break;
3083 default:
3084 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3085 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3086 break;
3087 }
3088
3089 ibmvfc_free_event(evt);
3090 wake_up(&vhost->work_wait_q);
3091}
3092
3093/**
3094 * ibmvfc_discover_targets - Send Discover Targets MAD
3095 * @vhost: ibmvfc host struct
3096 *
3097 **/
3098static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3099{
3100 struct ibmvfc_discover_targets *mad;
3101 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3102
3103 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3104 mad = &evt->iu.discover_targets;
3105 memset(mad, 0, sizeof(*mad));
3106 mad->common.version = 1;
3107 mad->common.opcode = IBMVFC_DISC_TARGETS;
3108 mad->common.length = sizeof(*mad);
3109 mad->bufflen = vhost->disc_buf_sz;
3110 mad->buffer.va = vhost->disc_buf_dma;
3111 mad->buffer.len = vhost->disc_buf_sz;
3112 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3113
3114 if (!ibmvfc_send_event(evt, vhost, default_timeout))
3115 ibmvfc_dbg(vhost, "Sent discover targets\n");
3116 else
3117 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3118}
3119
3120/**
3121 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3122 * @evt: ibmvfc event struct
3123 *
3124 **/
3125static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3126{
3127 struct ibmvfc_host *vhost = evt->vhost;
3128 u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3129 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3130 unsigned int npiv_max_sectors;
3131
3132 switch (mad_status) {
3133 case IBMVFC_MAD_SUCCESS:
3134 ibmvfc_free_event(evt);
3135 break;
3136 case IBMVFC_MAD_FAILED:
3137 dev_err(vhost->dev, "NPIV Login failed: %s (%x:%x)\n",
3138 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3139 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3140 ibmvfc_retry_host_init(vhost);
3141 else
3142 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3143 ibmvfc_free_event(evt);
3144 return;
3145 case IBMVFC_MAD_CRQ_ERROR:
3146 ibmvfc_retry_host_init(vhost);
3147 case IBMVFC_MAD_DRIVER_FAILED:
3148 ibmvfc_free_event(evt);
3149 return;
3150 default:
3151 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3152 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3153 ibmvfc_free_event(evt);
3154 return;
3155 }
3156
3157 vhost->client_migrated = 0;
3158
3159 if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
3160 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
3161 rsp->flags);
3162 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3163 wake_up(&vhost->work_wait_q);
3164 return;
3165 }
3166
3167 if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
3168 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
3169 rsp->max_cmds);
3170 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3171 wake_up(&vhost->work_wait_q);
3172 return;
3173 }
3174
3175 npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
3176 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
3177 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
3178 rsp->drc_name, npiv_max_sectors);
3179
3180 fc_host_fabric_name(vhost->host) = rsp->node_name;
3181 fc_host_node_name(vhost->host) = rsp->node_name;
3182 fc_host_port_name(vhost->host) = rsp->port_name;
3183 fc_host_port_id(vhost->host) = rsp->scsi_id;
3184 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
3185 fc_host_supported_classes(vhost->host) = 0;
3186 if (rsp->service_parms.class1_parms[0] & 0x80000000)
3187 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
3188 if (rsp->service_parms.class2_parms[0] & 0x80000000)
3189 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
3190 if (rsp->service_parms.class3_parms[0] & 0x80000000)
3191 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
3192 fc_host_maxframe_size(vhost->host) =
3193 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
3194
3195 vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
3196 vhost->host->max_sectors = npiv_max_sectors;
3197 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3198 wake_up(&vhost->work_wait_q);
3199}
3200
3201/**
3202 * ibmvfc_npiv_login - Sends NPIV login
3203 * @vhost: ibmvfc host struct
3204 *
3205 **/
3206static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
3207{
3208 struct ibmvfc_npiv_login_mad *mad;
3209 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3210
3211 ibmvfc_gather_partition_info(vhost);
3212 ibmvfc_set_login_info(vhost);
3213 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
3214
3215 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
3216 mad = &evt->iu.npiv_login;
3217 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
3218 mad->common.version = 1;
3219 mad->common.opcode = IBMVFC_NPIV_LOGIN;
3220 mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
3221 mad->buffer.va = vhost->login_buf_dma;
3222 mad->buffer.len = sizeof(*vhost->login_buf);
3223
3224 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
3225 vhost->async_crq.cur = 0;
3226 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3227
3228 if (!ibmvfc_send_event(evt, vhost, default_timeout))
3229 ibmvfc_dbg(vhost, "Sent NPIV login\n");
3230 else
3231 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3232};
3233
3234/**
3235 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
3236 * @vhost: ibmvfc host struct
3237 *
3238 * Returns:
3239 * 1 if work to do / 0 if not
3240 **/
3241static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
3242{
3243 struct ibmvfc_target *tgt;
3244
3245 list_for_each_entry(tgt, &vhost->targets, queue) {
3246 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
3247 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3248 return 1;
3249 }
3250
3251 return 0;
3252}
3253
3254/**
3255 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
3256 * @vhost: ibmvfc host struct
3257 *
3258 * Returns:
3259 * 1 if work to do / 0 if not
3260 **/
3261static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3262{
3263 struct ibmvfc_target *tgt;
3264
3265 if (kthread_should_stop())
3266 return 1;
3267 switch (vhost->action) {
3268 case IBMVFC_HOST_ACTION_NONE:
3269 case IBMVFC_HOST_ACTION_INIT_WAIT:
3270 return 0;
3271 case IBMVFC_HOST_ACTION_TGT_INIT:
3272 case IBMVFC_HOST_ACTION_QUERY_TGTS:
3273 if (vhost->discovery_threads == disc_threads)
3274 return 0;
3275 list_for_each_entry(tgt, &vhost->targets, queue)
3276 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
3277 return 1;
3278 list_for_each_entry(tgt, &vhost->targets, queue)
3279 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3280 return 0;
3281 return 1;
3282 case IBMVFC_HOST_ACTION_INIT:
3283 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3284 case IBMVFC_HOST_ACTION_TGT_ADD:
3285 case IBMVFC_HOST_ACTION_TGT_DEL:
3286 case IBMVFC_HOST_ACTION_QUERY:
3287 default:
3288 break;
3289 };
3290
3291 return 1;
3292}
3293
3294/**
3295 * ibmvfc_work_to_do - Is there task level work to do?
3296 * @vhost: ibmvfc host struct
3297 *
3298 * Returns:
3299 * 1 if work to do / 0 if not
3300 **/
3301static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3302{
3303 unsigned long flags;
3304 int rc;
3305
3306 spin_lock_irqsave(vhost->host->host_lock, flags);
3307 rc = __ibmvfc_work_to_do(vhost);
3308 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3309 return rc;
3310}
3311
3312/**
3313 * ibmvfc_log_ae - Log async events if necessary
3314 * @vhost: ibmvfc host struct
3315 * @events: events to log
3316 *
3317 **/
3318static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
3319{
3320 if (events & IBMVFC_AE_RSCN)
3321 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
3322 if ((events & IBMVFC_AE_LINKDOWN) &&
3323 vhost->state >= IBMVFC_HALTED)
3324 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
3325 if ((events & IBMVFC_AE_LINKUP) &&
3326 vhost->state == IBMVFC_INITIALIZING)
3327 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
3328}
3329
3330/**
3331 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
3332 * @tgt: ibmvfc target struct
3333 *
3334 **/
3335static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
3336{
3337 struct ibmvfc_host *vhost = tgt->vhost;
3338 struct fc_rport *rport;
3339 unsigned long flags;
3340
3341 tgt_dbg(tgt, "Adding rport\n");
3342 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
3343 spin_lock_irqsave(vhost->host->host_lock, flags);
3344 tgt->rport = rport;
3345 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3346 if (rport) {
3347 tgt_dbg(tgt, "rport add succeeded\n");
3348 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
3349 rport->supported_classes = 0;
3350 if (tgt->service_parms.class1_parms[0] & 0x80000000)
3351 rport->supported_classes |= FC_COS_CLASS1;
3352 if (tgt->service_parms.class2_parms[0] & 0x80000000)
3353 rport->supported_classes |= FC_COS_CLASS2;
3354 if (tgt->service_parms.class3_parms[0] & 0x80000000)
3355 rport->supported_classes |= FC_COS_CLASS3;
3356 } else
3357 tgt_dbg(tgt, "rport add failed\n");
3358 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3359}
3360
3361/**
3362 * ibmvfc_do_work - Do task level work
3363 * @vhost: ibmvfc host struct
3364 *
3365 **/
3366static void ibmvfc_do_work(struct ibmvfc_host *vhost)
3367{
3368 struct ibmvfc_target *tgt;
3369 unsigned long flags;
3370 struct fc_rport *rport;
3371
3372 ibmvfc_log_ae(vhost, vhost->events_to_log);
3373 spin_lock_irqsave(vhost->host->host_lock, flags);
3374 vhost->events_to_log = 0;
3375 switch (vhost->action) {
3376 case IBMVFC_HOST_ACTION_NONE:
3377 case IBMVFC_HOST_ACTION_INIT_WAIT:
3378 break;
3379 case IBMVFC_HOST_ACTION_INIT:
3380 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
3381 vhost->job_step(vhost);
3382 break;
3383 case IBMVFC_HOST_ACTION_QUERY:
3384 list_for_each_entry(tgt, &vhost->targets, queue)
3385 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
3386 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
3387 break;
3388 case IBMVFC_HOST_ACTION_QUERY_TGTS:
3389 list_for_each_entry(tgt, &vhost->targets, queue) {
3390 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3391 tgt->job_step(tgt);
3392 break;
3393 }
3394 }
3395
3396 if (!ibmvfc_dev_init_to_do(vhost))
3397 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
3398 break;
3399 case IBMVFC_HOST_ACTION_TGT_DEL:
3400 list_for_each_entry(tgt, &vhost->targets, queue) {
3401 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3402 tgt_dbg(tgt, "Deleting rport\n");
3403 rport = tgt->rport;
3404 tgt->rport = NULL;
3405 list_del(&tgt->queue);
3406 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3407 if (rport)
3408 fc_remote_port_delete(rport);
3409 kref_put(&tgt->kref, ibmvfc_release_tgt);
3410 return;
3411 }
3412 }
3413
3414 if (vhost->state == IBMVFC_INITIALIZING) {
3415 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
3416 vhost->job_step = ibmvfc_discover_targets;
3417 } else {
3418 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3419 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3420 scsi_unblock_requests(vhost->host);
3421 wake_up(&vhost->init_wait_q);
3422 return;
3423 }
3424 break;
3425 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3426 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
3427 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3428 ibmvfc_alloc_targets(vhost);
3429 spin_lock_irqsave(vhost->host->host_lock, flags);
3430 break;
3431 case IBMVFC_HOST_ACTION_TGT_INIT:
3432 list_for_each_entry(tgt, &vhost->targets, queue) {
3433 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3434 tgt->job_step(tgt);
3435 break;
3436 }
3437 }
3438
3439 if (!ibmvfc_dev_init_to_do(vhost)) {
3440 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
3441 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_ADD);
3442 vhost->init_retries = 0;
3443 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3444 scsi_unblock_requests(vhost->host);
3445 return;
3446 }
3447 break;
3448 case IBMVFC_HOST_ACTION_TGT_ADD:
3449 list_for_each_entry(tgt, &vhost->targets, queue) {
3450 if (tgt->action == IBMVFC_TGT_ACTION_ADD_RPORT) {
3451 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3452 ibmvfc_tgt_add_rport(tgt);
3453 return;
3454 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3455 tgt_dbg(tgt, "Deleting rport\n");
3456 rport = tgt->rport;
3457 tgt->rport = NULL;
3458 list_del(&tgt->queue);
3459 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3460 if (rport)
3461 fc_remote_port_delete(rport);
3462 kref_put(&tgt->kref, ibmvfc_release_tgt);
3463 return;
3464 }
3465 }
3466
3467 if (vhost->reinit) {
3468 vhost->reinit = 0;
3469 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3470 } else {
3471 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3472 wake_up(&vhost->init_wait_q);
3473 }
3474 break;
3475 default:
3476 break;
3477 };
3478
3479 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3480}
3481
3482/**
3483 * ibmvfc_work - Do task level work
3484 * @data: ibmvfc host struct
3485 *
3486 * Returns:
3487 * zero
3488 **/
3489static int ibmvfc_work(void *data)
3490{
3491 struct ibmvfc_host *vhost = data;
3492 int rc;
3493
3494 set_user_nice(current, -20);
3495
3496 while (1) {
3497 rc = wait_event_interruptible(vhost->work_wait_q,
3498 ibmvfc_work_to_do(vhost));
3499
3500 BUG_ON(rc);
3501
3502 if (kthread_should_stop())
3503 break;
3504
3505 ibmvfc_do_work(vhost);
3506 }
3507
3508 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
3509 return 0;
3510}
3511
3512/**
3513 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
3514 * @vhost: ibmvfc host struct
3515 *
3516 * Allocates a page for messages, maps it for dma, and registers
3517 * the crq with the hypervisor.
3518 *
3519 * Return value:
3520 * zero on success / other on failure
3521 **/
3522static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
3523{
3524 int rc, retrc = -ENOMEM;
3525 struct device *dev = vhost->dev;
3526 struct vio_dev *vdev = to_vio_dev(dev);
3527 struct ibmvfc_crq_queue *crq = &vhost->crq;
3528
3529 ENTER;
3530 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
3531
3532 if (!crq->msgs)
3533 return -ENOMEM;
3534
3535 crq->size = PAGE_SIZE / sizeof(*crq->msgs);
3536 crq->msg_token = dma_map_single(dev, crq->msgs,
3537 PAGE_SIZE, DMA_BIDIRECTIONAL);
3538
3539 if (dma_mapping_error(crq->msg_token))
3540 goto map_failed;
3541
3542 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
3543 crq->msg_token, PAGE_SIZE);
3544
3545 if (rc == H_RESOURCE)
3546 /* maybe kexecing and resource is busy. try a reset */
3547 retrc = rc = ibmvfc_reset_crq(vhost);
3548
3549 if (rc == H_CLOSED)
3550 dev_warn(dev, "Partner adapter not ready\n");
3551 else if (rc) {
3552 dev_warn(dev, "Error %d opening adapter\n", rc);
3553 goto reg_crq_failed;
3554 }
3555
3556 retrc = 0;
3557
3558 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
3559 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
3560 goto req_irq_failed;
3561 }
3562
3563 if ((rc = vio_enable_interrupts(vdev))) {
3564 dev_err(dev, "Error %d enabling interrupts\n", rc);
3565 goto req_irq_failed;
3566 }
3567
3568 crq->cur = 0;
3569 LEAVE;
3570 return retrc;
3571
3572req_irq_failed:
3573 do {
3574 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
3575 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
3576reg_crq_failed:
3577 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
3578map_failed:
3579 free_page((unsigned long)crq->msgs);
3580 return retrc;
3581}
3582
3583/**
3584 * ibmvfc_free_mem - Free memory for vhost
3585 * @vhost: ibmvfc host struct
3586 *
3587 * Return value:
3588 * none
3589 **/
3590static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
3591{
3592 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
3593
3594 ENTER;
3595 mempool_destroy(vhost->tgt_pool);
3596 kfree(vhost->trace);
3597 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
3598 vhost->disc_buf_dma);
3599 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
3600 vhost->login_buf, vhost->login_buf_dma);
3601 dma_pool_destroy(vhost->sg_pool);
3602 dma_unmap_single(vhost->dev, async_q->msg_token,
3603 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
3604 free_page((unsigned long)async_q->msgs);
3605 LEAVE;
3606}
3607
3608/**
3609 * ibmvfc_alloc_mem - Allocate memory for vhost
3610 * @vhost: ibmvfc host struct
3611 *
3612 * Return value:
3613 * 0 on success / non-zero on failure
3614 **/
3615static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
3616{
3617 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
3618 struct device *dev = vhost->dev;
3619
3620 ENTER;
3621 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
3622 if (!async_q->msgs) {
3623 dev_err(dev, "Couldn't allocate async queue.\n");
3624 goto nomem;
3625 }
3626
3627 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
3628 async_q->msg_token = dma_map_single(dev, async_q->msgs,
3629 async_q->size * sizeof(*async_q->msgs),
3630 DMA_BIDIRECTIONAL);
3631
3632 if (dma_mapping_error(async_q->msg_token)) {
3633 dev_err(dev, "Failed to map async queue\n");
3634 goto free_async_crq;
3635 }
3636
3637 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
3638 SG_ALL * sizeof(struct srp_direct_buf),
3639 sizeof(struct srp_direct_buf), 0);
3640
3641 if (!vhost->sg_pool) {
3642 dev_err(dev, "Failed to allocate sg pool\n");
3643 goto unmap_async_crq;
3644 }
3645
3646 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
3647 &vhost->login_buf_dma, GFP_KERNEL);
3648
3649 if (!vhost->login_buf) {
3650 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
3651 goto free_sg_pool;
3652 }
3653
3654 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
3655 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
3656 &vhost->disc_buf_dma, GFP_KERNEL);
3657
3658 if (!vhost->disc_buf) {
3659 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
3660 goto free_login_buffer;
3661 }
3662
3663 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
3664 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
3665
3666 if (!vhost->trace)
3667 goto free_disc_buffer;
3668
3669 vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
3670 sizeof(struct ibmvfc_target));
3671
3672 if (!vhost->tgt_pool) {
3673 dev_err(dev, "Couldn't allocate target memory pool\n");
3674 goto free_trace;
3675 }
3676
3677 LEAVE;
3678 return 0;
3679
3680free_trace:
3681 kfree(vhost->trace);
3682free_disc_buffer:
3683 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
3684 vhost->disc_buf_dma);
3685free_login_buffer:
3686 dma_free_coherent(dev, sizeof(*vhost->login_buf),
3687 vhost->login_buf, vhost->login_buf_dma);
3688free_sg_pool:
3689 dma_pool_destroy(vhost->sg_pool);
3690unmap_async_crq:
3691 dma_unmap_single(dev, async_q->msg_token,
3692 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
3693free_async_crq:
3694 free_page((unsigned long)async_q->msgs);
3695nomem:
3696 LEAVE;
3697 return -ENOMEM;
3698}
3699
3700/**
3701 * ibmvfc_probe - Adapter hot plug add entry point
3702 * @vdev: vio device struct
3703 * @id: vio device id struct
3704 *
3705 * Return value:
3706 * 0 on success / non-zero on failure
3707 **/
3708static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
3709{
3710 struct ibmvfc_host *vhost;
3711 struct Scsi_Host *shost;
3712 struct device *dev = &vdev->dev;
3713 int rc = -ENOMEM;
3714
3715 ENTER;
3716 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
3717 if (!shost) {
3718 dev_err(dev, "Couldn't allocate host data\n");
3719 goto out;
3720 }
3721
3722 shost->transportt = ibmvfc_transport_template;
3723 shost->can_queue = max_requests;
3724 shost->max_lun = max_lun;
3725 shost->max_id = max_targets;
3726 shost->max_sectors = IBMVFC_MAX_SECTORS;
3727 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
3728 shost->unique_id = shost->host_no;
3729
3730 vhost = shost_priv(shost);
3731 INIT_LIST_HEAD(&vhost->sent);
3732 INIT_LIST_HEAD(&vhost->free);
3733 INIT_LIST_HEAD(&vhost->targets);
3734 sprintf(vhost->name, IBMVFC_NAME);
3735 vhost->host = shost;
3736 vhost->dev = dev;
3737 vhost->partition_number = -1;
3738 vhost->log_level = log_level;
3739 strcpy(vhost->partition_name, "UNKNOWN");
3740 init_waitqueue_head(&vhost->work_wait_q);
3741 init_waitqueue_head(&vhost->init_wait_q);
3742
3743 if ((rc = ibmvfc_alloc_mem(vhost)))
3744 goto free_scsi_host;
3745
3746 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
3747 shost->host_no);
3748
3749 if (IS_ERR(vhost->work_thread)) {
3750 dev_err(dev, "Couldn't create kernel thread: %ld\n",
3751 PTR_ERR(vhost->work_thread));
3752 goto free_host_mem;
3753 }
3754
3755 if ((rc = ibmvfc_init_crq(vhost))) {
3756 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
3757 goto kill_kthread;
3758 }
3759
3760 if ((rc = ibmvfc_init_event_pool(vhost))) {
3761 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
3762 goto release_crq;
3763 }
3764
3765 if ((rc = scsi_add_host(shost, dev)))
3766 goto release_event_pool;
3767
3768 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
3769 &ibmvfc_trace_attr))) {
3770 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
3771 goto remove_shost;
3772 }
3773
3774 dev_set_drvdata(dev, vhost);
3775 spin_lock(&ibmvfc_driver_lock);
3776 list_add_tail(&vhost->queue, &ibmvfc_head);
3777 spin_unlock(&ibmvfc_driver_lock);
3778
3779 ibmvfc_send_crq_init(vhost);
3780 scsi_scan_host(shost);
3781 return 0;
3782
3783remove_shost:
3784 scsi_remove_host(shost);
3785release_event_pool:
3786 ibmvfc_free_event_pool(vhost);
3787release_crq:
3788 ibmvfc_release_crq_queue(vhost);
3789kill_kthread:
3790 kthread_stop(vhost->work_thread);
3791free_host_mem:
3792 ibmvfc_free_mem(vhost);
3793free_scsi_host:
3794 scsi_host_put(shost);
3795out:
3796 LEAVE;
3797 return rc;
3798}
3799
3800/**
3801 * ibmvfc_remove - Adapter hot plug remove entry point
3802 * @vdev: vio device struct
3803 *
3804 * Return value:
3805 * 0
3806 **/
3807static int ibmvfc_remove(struct vio_dev *vdev)
3808{
3809 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
3810 unsigned long flags;
3811
3812 ENTER;
3813 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
3814 kthread_stop(vhost->work_thread);
3815 fc_remove_host(vhost->host);
3816 scsi_remove_host(vhost->host);
3817 ibmvfc_release_crq_queue(vhost);
3818
3819 spin_lock_irqsave(vhost->host->host_lock, flags);
3820 ibmvfc_purge_requests(vhost, DID_ERROR);
3821 ibmvfc_free_event_pool(vhost);
3822 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3823
3824 ibmvfc_free_mem(vhost);
3825 spin_lock(&ibmvfc_driver_lock);
3826 list_del(&vhost->queue);
3827 spin_unlock(&ibmvfc_driver_lock);
3828 scsi_host_put(vhost->host);
3829 LEAVE;
3830 return 0;
3831}
3832
39c1ffec
BK		 3833/**
3834 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
3835 * @vdev: vio device struct
3836 *
3837 * Return value:
3838 * Number of bytes the driver will need to DMA map at the same time in
3839 * order to perform well.
3840 */
3841static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
3842{
3843 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
3844 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
3845}
3846
072b91f9
BK		 3847static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
3848 {"fcp", "IBM,vfc-client"},
3849 { "", "" }
3850};
3851MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
3852
3853static struct vio_driver ibmvfc_driver = {
3854 .id_table = ibmvfc_device_table,
3855 .probe = ibmvfc_probe,
3856 .remove = ibmvfc_remove,
39c1ffec 3857 .get_desired_dma = ibmvfc_get_desired_dma,
072b91f9
BK		 3858 .driver = {
3859 .name = IBMVFC_NAME,
3860 .owner = THIS_MODULE,
3861 }
3862};
3863
3864static struct fc_function_template ibmvfc_transport_functions = {
3865 .show_host_fabric_name = 1,
3866 .show_host_node_name = 1,
3867 .show_host_port_name = 1,
3868 .show_host_supported_classes = 1,
3869 .show_host_port_type = 1,
3870 .show_host_port_id = 1,
3871
3872 .get_host_port_state = ibmvfc_get_host_port_state,
3873 .show_host_port_state = 1,
3874
3875 .get_host_speed = ibmvfc_get_host_speed,
3876 .show_host_speed = 1,
3877
3878 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
3879 .terminate_rport_io = ibmvfc_terminate_rport_io,
3880
3881 .show_rport_maxframe_size = 1,
3882 .show_rport_supported_classes = 1,
3883
3884 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
3885 .show_rport_dev_loss_tmo = 1,
3886
3887 .get_starget_node_name = ibmvfc_get_starget_node_name,
3888 .show_starget_node_name = 1,
3889
3890 .get_starget_port_name = ibmvfc_get_starget_port_name,
3891 .show_starget_port_name = 1,
3892
3893 .get_starget_port_id = ibmvfc_get_starget_port_id,
3894 .show_starget_port_id = 1,
3895};
3896
3897/**
3898 * ibmvfc_module_init - Initialize the ibmvfc module
3899 *
3900 * Return value:
3901 * 0 on success / other on failure
3902 **/
3903static int __init ibmvfc_module_init(void)
3904{
3905 int rc;
3906
3907 if (!firmware_has_feature(FW_FEATURE_VIO))
3908 return -ENODEV;
3909
3910 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
3911 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
3912
3913 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
3914 if (!ibmvfc_transport_template)
3915 return -ENOMEM;
3916
3917 rc = vio_register_driver(&ibmvfc_driver);
3918 if (rc)
3919 fc_release_transport(ibmvfc_transport_template);
3920 return rc;
3921}
3922
3923/**
3924 * ibmvfc_module_exit - Teardown the ibmvfc module
3925 *
3926 * Return value:
3927 * nothing
3928 **/
3929static void __exit ibmvfc_module_exit(void)
3930{
3931 vio_unregister_driver(&ibmvfc_driver);
3932 fc_release_transport(ibmvfc_transport_template);
3933}
3934
3935module_init(ibmvfc_module_init);
3936module_exit(ibmvfc_module_exit);
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