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dma-mapping: add the device argument to dma_mapping_error()
[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / ibmvscsi / ibmvfc.c
CommitLineData
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/**
857 * __ibmvfc_find_target - Find the specified scsi_target (no locking)
858 * @starget: scsi target struct
859 *
860 * Return value:
861 * ibmvfc_target struct / NULL if not found
862 **/
863static struct ibmvfc_target *__ibmvfc_find_target(struct scsi_target *starget)
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)
870 if (tgt->target_id == starget->id)
871 return tgt;
872 return NULL;
873}
874
875/**
876 * ibmvfc_find_target - Find the specified scsi_target
877 * @starget: scsi target struct
878 *
879 * Return value:
880 * ibmvfc_target struct / NULL if not found
881 **/
882static struct ibmvfc_target *ibmvfc_find_target(struct scsi_target *starget)
883{
884 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
885 struct ibmvfc_target *tgt;
886 unsigned long flags;
887
888 spin_lock_irqsave(shost->host_lock, flags);
889 tgt = __ibmvfc_find_target(starget);
890 spin_unlock_irqrestore(shost->host_lock, flags);
891 return tgt;
892}
893
894/**
895 * ibmvfc_get_host_speed - Get host port speed
896 * @shost: scsi host struct
897 *
898 * Return value:
899 * none
900 **/
901static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
902{
903 struct ibmvfc_host *vhost = shost_priv(shost);
904 unsigned long flags;
905
906 spin_lock_irqsave(shost->host_lock, flags);
907 if (vhost->state == IBMVFC_ACTIVE) {
908 switch (vhost->login_buf->resp.link_speed / 100) {
909 case 1:
910 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
911 break;
912 case 2:
913 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
914 break;
915 case 4:
916 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
917 break;
918 case 8:
919 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
920 break;
921 case 10:
922 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
923 break;
924 case 16:
925 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
926 break;
927 default:
928 ibmvfc_log(vhost, 3, "Unknown port speed: %ld Gbit\n",
929 vhost->login_buf->resp.link_speed / 100);
930 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
931 break;
932 }
933 } else
934 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
935 spin_unlock_irqrestore(shost->host_lock, flags);
936}
937
938/**
939 * ibmvfc_get_host_port_state - Get host port state
940 * @shost: scsi host struct
941 *
942 * Return value:
943 * none
944 **/
945static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
946{
947 struct ibmvfc_host *vhost = shost_priv(shost);
948 unsigned long flags;
949
950 spin_lock_irqsave(shost->host_lock, flags);
951 switch (vhost->state) {
952 case IBMVFC_INITIALIZING:
953 case IBMVFC_ACTIVE:
954 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
955 break;
956 case IBMVFC_LINK_DOWN:
957 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
958 break;
959 case IBMVFC_LINK_DEAD:
960 case IBMVFC_HOST_OFFLINE:
961 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
962 break;
963 case IBMVFC_HALTED:
964 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
965 break;
966 default:
967 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
968 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
969 break;
970 }
971 spin_unlock_irqrestore(shost->host_lock, flags);
972}
973
974/**
975 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
976 * @rport: rport struct
977 * @timeout: timeout value
978 *
979 * Return value:
980 * none
981 **/
982static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
983{
984 if (timeout)
985 rport->dev_loss_tmo = timeout;
986 else
987 rport->dev_loss_tmo = 1;
988}
989
990/**
991 * ibmvfc_get_starget_node_name - Get SCSI target's node name
992 * @starget: scsi target struct
993 *
994 * Return value:
995 * none
996 **/
997static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
998{
999 struct ibmvfc_target *tgt = ibmvfc_find_target(starget);
1000 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1001}
1002
1003/**
1004 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1005 * @starget: scsi target struct
1006 *
1007 * Return value:
1008 * none
1009 **/
1010static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1011{
1012 struct ibmvfc_target *tgt = ibmvfc_find_target(starget);
1013 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1014}
1015
1016/**
1017 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1018 * @starget: scsi target struct
1019 *
1020 * Return value:
1021 * none
1022 **/
1023static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1024{
1025 struct ibmvfc_target *tgt = ibmvfc_find_target(starget);
1026 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1027}
1028
1029/**
1030 * ibmvfc_wait_while_resetting - Wait while the host resets
1031 * @vhost: ibmvfc host struct
1032 *
1033 * Return value:
1034 * 0 on success / other on failure
1035 **/
1036static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1037{
1038 long timeout = wait_event_timeout(vhost->init_wait_q,
1039 (vhost->state == IBMVFC_ACTIVE ||
1040 vhost->state == IBMVFC_HOST_OFFLINE ||
1041 vhost->state == IBMVFC_LINK_DEAD),
1042 (init_timeout * HZ));
1043
1044 return timeout ? 0 : -EIO;
1045}
1046
1047/**
1048 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1049 * @shost: scsi host struct
1050 *
1051 * Return value:
1052 * 0 on success / other on failure
1053 **/
1054static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1055{
1056 struct ibmvfc_host *vhost = shost_priv(shost);
1057
1058 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1059 ibmvfc_reset_host(vhost);
1060 return ibmvfc_wait_while_resetting(vhost);
1061}
1062
1063/**
1064 * ibmvfc_gather_partition_info - Gather info about the LPAR
1065 *
1066 * Return value:
1067 * none
1068 **/
1069static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1070{
1071 struct device_node *rootdn;
1072 const char *name;
1073 const unsigned int *num;
1074
1075 rootdn = of_find_node_by_path("/");
1076 if (!rootdn)
1077 return;
1078
1079 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1080 if (name)
1081 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1082 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1083 if (num)
1084 vhost->partition_number = *num;
1085 of_node_put(rootdn);
1086}
1087
1088/**
1089 * ibmvfc_set_login_info - Setup info for NPIV login
1090 * @vhost: ibmvfc host struct
1091 *
1092 * Return value:
1093 * none
1094 **/
1095static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1096{
1097 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1098 struct device_node *of_node = vhost->dev->archdata.of_node;
1099 const char *location;
1100
1101 memset(login_info, 0, sizeof(*login_info));
1102
1103 login_info->ostype = IBMVFC_OS_LINUX;
1104 login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1105 login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1106 login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1107 login_info->partition_num = vhost->partition_number;
1108 login_info->vfc_frame_version = 1;
1109 login_info->fcp_version = 3;
1110 if (vhost->client_migrated)
1111 login_info->flags = IBMVFC_CLIENT_MIGRATED;
1112
1113 login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1114 login_info->capabilities = IBMVFC_CAN_MIGRATE;
1115 login_info->async.va = vhost->async_crq.msg_token;
1116 login_info->async.len = vhost->async_crq.size;
1117 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1118 strncpy(login_info->device_name,
1119 vhost->host->shost_gendev.bus_id, IBMVFC_MAX_NAME);
1120
1121 location = of_get_property(of_node, "ibm,loc-code", NULL);
1122 location = location ? location : vhost->dev->bus_id;
1123 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1124}
1125
1126/**
1127 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1128 * @vhost: ibmvfc host who owns the event pool
1129 *
1130 * Returns zero on success.
1131 **/
1132static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1133{
1134 int i;
1135 struct ibmvfc_event_pool *pool = &vhost->pool;
1136
1137 ENTER;
1138 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1139 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1140 if (!pool->events)
1141 return -ENOMEM;
1142
1143 pool->iu_storage = dma_alloc_coherent(vhost->dev,
1144 pool->size * sizeof(*pool->iu_storage),
1145 &pool->iu_token, 0);
1146
1147 if (!pool->iu_storage) {
1148 kfree(pool->events);
1149 return -ENOMEM;
1150 }
1151
1152 for (i = 0; i < pool->size; ++i) {
1153 struct ibmvfc_event *evt = &pool->events[i];
1154 atomic_set(&evt->free, 1);
1155 evt->crq.valid = 0x80;
1156 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1157 evt->xfer_iu = pool->iu_storage + i;
1158 evt->vhost = vhost;
1159 evt->ext_list = NULL;
1160 list_add_tail(&evt->queue, &vhost->free);
1161 }
1162
1163 LEAVE;
1164 return 0;
1165}
1166
1167/**
1168 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1169 * @vhost: ibmvfc host who owns the event pool
1170 *
1171 **/
1172static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1173{
1174 int i;
1175 struct ibmvfc_event_pool *pool = &vhost->pool;
1176
1177 ENTER;
1178 for (i = 0; i < pool->size; ++i) {
1179 list_del(&pool->events[i].queue);
1180 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1181 if (pool->events[i].ext_list)
1182 dma_pool_free(vhost->sg_pool,
1183 pool->events[i].ext_list,
1184 pool->events[i].ext_list_token);
1185 }
1186
1187 kfree(pool->events);
1188 dma_free_coherent(vhost->dev,
1189 pool->size * sizeof(*pool->iu_storage),
1190 pool->iu_storage, pool->iu_token);
1191 LEAVE;
1192}
1193
1194/**
1195 * ibmvfc_get_event - Gets the next free event in pool
1196 * @vhost: ibmvfc host struct
1197 *
1198 * Returns a free event from the pool.
1199 **/
1200static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1201{
1202 struct ibmvfc_event *evt;
1203
1204 BUG_ON(list_empty(&vhost->free));
1205 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1206 atomic_set(&evt->free, 0);
1207 list_del(&evt->queue);
1208 return evt;
1209}
1210
1211/**
1212 * ibmvfc_init_event - Initialize fields in an event struct that are always
1213 * required.
1214 * @evt: The event
1215 * @done: Routine to call when the event is responded to
1216 * @format: SRP or MAD format
1217 **/
1218static void ibmvfc_init_event(struct ibmvfc_event *evt,
1219 void (*done) (struct ibmvfc_event *), u8 format)
1220{
1221 evt->cmnd = NULL;
1222 evt->sync_iu = NULL;
1223 evt->crq.format = format;
1224 evt->done = done;
1225}
1226
1227/**
1228 * ibmvfc_map_sg_list - Initialize scatterlist
1229 * @scmd: scsi command struct
1230 * @nseg: number of scatterlist segments
1231 * @md: memory descriptor list to initialize
1232 **/
1233static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1234 struct srp_direct_buf *md)
1235{
1236 int i;
1237 struct scatterlist *sg;
1238
1239 scsi_for_each_sg(scmd, sg, nseg, i) {
1240 md[i].va = sg_dma_address(sg);
1241 md[i].len = sg_dma_len(sg);
1242 md[i].key = 0;
1243 }
1244}
1245
1246/**
1247 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1248 * @scmd: Scsi_Cmnd with the scatterlist
1249 * @evt: ibmvfc event struct
1250 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1251 * @dev: device for which to map dma memory
1252 *
1253 * Returns:
1254 * 0 on success / non-zero on failure
1255 **/
1256static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1257 struct ibmvfc_event *evt,
1258 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1259{
1260
1261 int sg_mapped;
1262 struct srp_direct_buf *data = &vfc_cmd->ioba;
1263 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1264
1265 sg_mapped = scsi_dma_map(scmd);
1266 if (!sg_mapped) {
1267 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1268 return 0;
1269 } else if (unlikely(sg_mapped < 0)) {
1270 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1271 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1272 return sg_mapped;
1273 }
1274
1275 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1276 vfc_cmd->flags |= IBMVFC_WRITE;
1277 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1278 } else {
1279 vfc_cmd->flags |= IBMVFC_READ;
1280 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1281 }
1282
1283 if (sg_mapped == 1) {
1284 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1285 return 0;
1286 }
1287
1288 vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1289
1290 if (!evt->ext_list) {
1291 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1292 &evt->ext_list_token);
1293
1294 if (!evt->ext_list) {
1295 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1296 return -ENOMEM;
1297 }
1298 }
1299
1300 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1301
1302 data->va = evt->ext_list_token;
1303 data->len = sg_mapped * sizeof(struct srp_direct_buf);
1304 data->key = 0;
1305 return 0;
1306}
1307
1308/**
1309 * ibmvfc_timeout - Internal command timeout handler
1310 * @evt: struct ibmvfc_event that timed out
1311 *
1312 * Called when an internally generated command times out
1313 **/
1314static void ibmvfc_timeout(struct ibmvfc_event *evt)
1315{
1316 struct ibmvfc_host *vhost = evt->vhost;
1317 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1318 ibmvfc_reset_host(vhost);
1319}
1320
1321/**
1322 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1323 * @evt: event to be sent
1324 * @vhost: ibmvfc host struct
1325 * @timeout: timeout in seconds - 0 means do not time command
1326 *
1327 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1328 **/
1329static int ibmvfc_send_event(struct ibmvfc_event *evt,
1330 struct ibmvfc_host *vhost, unsigned long timeout)
1331{
1332 u64 *crq_as_u64 = (u64 *) &evt->crq;
1333 int rc;
1334
1335 /* Copy the IU into the transfer area */
1336 *evt->xfer_iu = evt->iu;
1337 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1338 evt->xfer_iu->cmd.tag = (u64)evt;
1339 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1340 evt->xfer_iu->mad_common.tag = (u64)evt;
1341 else
1342 BUG();
1343
1344 list_add_tail(&evt->queue, &vhost->sent);
1345 init_timer(&evt->timer);
1346
1347 if (timeout) {
1348 evt->timer.data = (unsigned long) evt;
1349 evt->timer.expires = jiffies + (timeout * HZ);
1350 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1351 add_timer(&evt->timer);
1352 }
1353
1354 if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1355 list_del(&evt->queue);
1356 del_timer(&evt->timer);
1357
1358 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1359 * Firmware will send a CRQ with a transport event (0xFF) to
1360 * tell this client what has happened to the transport. This
1361 * will be handled in ibmvfc_handle_crq()
1362 */
1363 if (rc == H_CLOSED) {
1364 if (printk_ratelimit())
1365 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1366 if (evt->cmnd)
1367 scsi_dma_unmap(evt->cmnd);
1368 ibmvfc_free_event(evt);
1369 return SCSI_MLQUEUE_HOST_BUSY;
1370 }
1371
1372 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1373 if (evt->cmnd) {
1374 evt->cmnd->result = DID_ERROR << 16;
1375 evt->done = ibmvfc_scsi_eh_done;
1376 } else
1377 evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1378
1379 evt->done(evt);
1380 } else
1381 ibmvfc_trc_start(evt);
1382
1383 return 0;
1384}
1385
1386/**
1387 * ibmvfc_log_error - Log an error for the failed command if appropriate
1388 * @evt: ibmvfc event to log
1389 *
1390 **/
1391static void ibmvfc_log_error(struct ibmvfc_event *evt)
1392{
1393 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1394 struct ibmvfc_host *vhost = evt->vhost;
1395 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1396 struct scsi_cmnd *cmnd = evt->cmnd;
1397 const char *err = unknown_error;
1398 int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1399 int logerr = 0;
1400 int rsp_code = 0;
1401
1402 if (index >= 0) {
1403 logerr = cmd_status[index].log;
1404 err = cmd_status[index].name;
1405 }
1406
1407 if (!logerr && (vhost->log_level <= IBMVFC_DEFAULT_LOG_LEVEL))
1408 return;
1409
1410 if (rsp->flags & FCP_RSP_LEN_VALID)
1411 rsp_code = rsp->data.info.rsp_code;
1412
1413 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1414 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1415 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1416 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1417}
1418
1419/**
1420 * ibmvfc_scsi_done - Handle responses from commands
1421 * @evt: ibmvfc event to be handled
1422 *
1423 * Used as a callback when sending scsi cmds.
1424 **/
1425static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1426{
1427 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1428 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1429 struct scsi_cmnd *cmnd = evt->cmnd;
1430 int rsp_len = 0;
1431 int sense_len = rsp->fcp_sense_len;
1432
1433 if (cmnd) {
1434 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1435 scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1436 else if (rsp->flags & FCP_RESID_UNDER)
1437 scsi_set_resid(cmnd, rsp->fcp_resid);
1438 else
1439 scsi_set_resid(cmnd, 0);
1440
1441 if (vfc_cmd->status) {
1442 cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1443
1444 if (rsp->flags & FCP_RSP_LEN_VALID)
1445 rsp_len = rsp->fcp_rsp_len;
1446 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1447 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1448 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len)
1449 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1450
1451 ibmvfc_log_error(evt);
1452 }
1453
1454 if (!cmnd->result &&
1455 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1456 cmnd->result = (DID_ERROR << 16);
1457
1458 scsi_dma_unmap(cmnd);
1459 cmnd->scsi_done(cmnd);
1460 }
1461
1462 ibmvfc_free_event(evt);
1463}
1464
1465/**
1466 * ibmvfc_host_chkready - Check if the host can accept commands
1467 * @vhost: struct ibmvfc host
1468 *
1469 * Returns:
1470 * 1 if host can accept command / 0 if not
1471 **/
1472static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1473{
1474 int result = 0;
1475
1476 switch (vhost->state) {
1477 case IBMVFC_LINK_DEAD:
1478 case IBMVFC_HOST_OFFLINE:
1479 result = DID_NO_CONNECT << 16;
1480 break;
1481 case IBMVFC_NO_CRQ:
1482 case IBMVFC_INITIALIZING:
1483 case IBMVFC_HALTED:
1484 case IBMVFC_LINK_DOWN:
1485 result = DID_REQUEUE << 16;
1486 break;
1487 case IBMVFC_ACTIVE:
1488 result = 0;
1489 break;
1490 };
1491
1492 return result;
1493}
1494
1495/**
1496 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1497 * @cmnd: struct scsi_cmnd to be executed
1498 * @done: Callback function to be called when cmnd is completed
1499 *
1500 * Returns:
1501 * 0 on success / other on failure
1502 **/
1503static int ibmvfc_queuecommand(struct scsi_cmnd *cmnd,
1504 void (*done) (struct scsi_cmnd *))
1505{
1506 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1507 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1508 struct ibmvfc_cmd *vfc_cmd;
1509 struct ibmvfc_event *evt;
1510 u8 tag[2];
1511 int rc;
1512
1513 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1514 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1515 cmnd->result = rc;
1516 done(cmnd);
1517 return 0;
1518 }
1519
1520 cmnd->result = (DID_OK << 16);
1521 evt = ibmvfc_get_event(vhost);
1522 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1523 evt->cmnd = cmnd;
1524 cmnd->scsi_done = done;
1525 vfc_cmd = &evt->iu.cmd;
1526 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1527 vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1528 vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1529 vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1530 vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1531 vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1532 vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1533 vfc_cmd->tgt_scsi_id = rport->port_id;
1534 if ((rport->supported_classes & FC_COS_CLASS3) &&
1535 (fc_host_supported_classes(vhost->host) & FC_COS_CLASS3))
1536 vfc_cmd->flags = IBMVFC_CLASS_3_ERR;
1537 vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1538 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1539 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1540
1541 if (scsi_populate_tag_msg(cmnd, tag)) {
1542 vfc_cmd->task_tag = tag[1];
1543 switch (tag[0]) {
1544 case MSG_SIMPLE_TAG:
1545 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1546 break;
1547 case MSG_HEAD_TAG:
1548 vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1549 break;
1550 case MSG_ORDERED_TAG:
1551 vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1552 break;
1553 };
1554 }
1555
1556 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1557 return ibmvfc_send_event(evt, vhost, 0);
1558
1559 ibmvfc_free_event(evt);
1560 if (rc == -ENOMEM)
1561 return SCSI_MLQUEUE_HOST_BUSY;
1562
1563 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1564 scmd_printk(KERN_ERR, cmnd,
1565 "Failed to map DMA buffer for command. rc=%d\n", rc);
1566
1567 cmnd->result = DID_ERROR << 16;
1568 done(cmnd);
1569 return 0;
1570}
1571
1572/**
1573 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1574 * @evt: ibmvfc event struct
1575 *
1576 **/
1577static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1578{
1579 /* copy the response back */
1580 if (evt->sync_iu)
1581 *evt->sync_iu = *evt->xfer_iu;
1582
1583 complete(&evt->comp);
1584}
1585
1586/**
1587 * ibmvfc_reset_device - Reset the device with the specified reset type
1588 * @sdev: scsi device to reset
1589 * @type: reset type
1590 * @desc: reset type description for log messages
1591 *
1592 * Returns:
1593 * 0 on success / other on failure
1594 **/
1595static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1596{
1597 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1598 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1599 struct ibmvfc_cmd *tmf;
1600 struct ibmvfc_event *evt;
1601 union ibmvfc_iu rsp_iu;
1602 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1603 int rsp_rc = -EBUSY;
1604 unsigned long flags;
1605 int rsp_code = 0;
1606
1607 spin_lock_irqsave(vhost->host->host_lock, flags);
1608 if (vhost->state == IBMVFC_ACTIVE) {
1609 evt = ibmvfc_get_event(vhost);
1610 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1611
1612 tmf = &evt->iu.cmd;
1613 memset(tmf, 0, sizeof(*tmf));
1614 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1615 tmf->resp.len = sizeof(tmf->rsp);
1616 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1617 tmf->payload_len = sizeof(tmf->iu);
1618 tmf->resp_len = sizeof(tmf->rsp);
1619 tmf->cancel_key = (unsigned long)sdev->hostdata;
1620 tmf->tgt_scsi_id = rport->port_id;
1621 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1622 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1623 tmf->iu.tmf_flags = type;
1624 evt->sync_iu = &rsp_iu;
1625
1626 init_completion(&evt->comp);
1627 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1628 }
1629 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1630
1631 if (rsp_rc != 0) {
1632 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1633 desc, rsp_rc);
1634 return -EIO;
1635 }
1636
1637 sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
1638 wait_for_completion(&evt->comp);
1639
1640 if (rsp_iu.cmd.status) {
1641 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1642 rsp_code = fc_rsp->data.info.rsp_code;
1643
1644 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
1645 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1646 desc, ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1647 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1648 fc_rsp->scsi_status);
1649 rsp_rc = -EIO;
1650 } else
1651 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
1652
1653 spin_lock_irqsave(vhost->host->host_lock, flags);
1654 ibmvfc_free_event(evt);
1655 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1656 return rsp_rc;
1657}
1658
1659/**
1660 * ibmvfc_abort_task_set - Abort outstanding commands to the device
1661 * @sdev: scsi device to abort commands
1662 *
1663 * This sends an Abort Task Set to the VIOS for the specified device. This does
1664 * NOT send any cancel to the VIOS. That must be done separately.
1665 *
1666 * Returns:
1667 * 0 on success / other on failure
1668 **/
1669static int ibmvfc_abort_task_set(struct scsi_device *sdev)
1670{
1671 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1672 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1673 struct ibmvfc_cmd *tmf;
1674 struct ibmvfc_event *evt, *found_evt;
1675 union ibmvfc_iu rsp_iu;
1676 struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1677 int rsp_rc = -EBUSY;
1678 unsigned long flags;
1679 int rsp_code = 0;
1680
1681 spin_lock_irqsave(vhost->host->host_lock, flags);
1682 found_evt = NULL;
1683 list_for_each_entry(evt, &vhost->sent, queue) {
1684 if (evt->cmnd && evt->cmnd->device == sdev) {
1685 found_evt = evt;
1686 break;
1687 }
1688 }
1689
1690 if (!found_evt) {
1691 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1692 sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
1693 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1694 return 0;
1695 }
1696
1697 if (vhost->state == IBMVFC_ACTIVE) {
1698 evt = ibmvfc_get_event(vhost);
1699 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1700
1701 tmf = &evt->iu.cmd;
1702 memset(tmf, 0, sizeof(*tmf));
1703 tmf->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1704 tmf->resp.len = sizeof(tmf->rsp);
1705 tmf->frame_type = IBMVFC_SCSI_FCP_TYPE;
1706 tmf->payload_len = sizeof(tmf->iu);
1707 tmf->resp_len = sizeof(tmf->rsp);
1708 tmf->cancel_key = (unsigned long)sdev->hostdata;
1709 tmf->tgt_scsi_id = rport->port_id;
1710 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1711 tmf->flags = (IBMVFC_NO_MEM_DESC | IBMVFC_TMF);
1712 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
1713 evt->sync_iu = &rsp_iu;
1714
1715 init_completion(&evt->comp);
1716 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1717 }
1718
1719 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1720
1721 if (rsp_rc != 0) {
1722 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
1723 return -EIO;
1724 }
1725
1726 sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
1727 wait_for_completion(&evt->comp);
1728
1729 if (rsp_iu.cmd.status) {
1730 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
1731 rsp_code = fc_rsp->data.info.rsp_code;
1732
1733 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
1734 "flags: %x fcp_rsp: %x, scsi_status: %x\n",
1735 ibmvfc_get_cmd_error(rsp_iu.cmd.status, rsp_iu.cmd.error),
1736 rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
1737 fc_rsp->scsi_status);
1738 rsp_rc = -EIO;
1739 } else
1740 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
1741
1742 spin_lock_irqsave(vhost->host->host_lock, flags);
1743 ibmvfc_free_event(evt);
1744 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1745 return rsp_rc;
1746}
1747
1748/**
1749 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
1750 * @sdev: scsi device to cancel commands
1751 * @type: type of error recovery being performed
1752 *
1753 * This sends a cancel to the VIOS for the specified device. This does
1754 * NOT send any abort to the actual device. That must be done separately.
1755 *
1756 * Returns:
1757 * 0 on success / other on failure
1758 **/
1759static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
1760{
1761 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1762 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1763 struct ibmvfc_tmf *tmf;
1764 struct ibmvfc_event *evt, *found_evt;
1765 union ibmvfc_iu rsp;
1766 int rsp_rc = -EBUSY;
1767 unsigned long flags;
1768 u16 status;
1769
1770 ENTER;
1771 spin_lock_irqsave(vhost->host->host_lock, flags);
1772 found_evt = NULL;
1773 list_for_each_entry(evt, &vhost->sent, queue) {
1774 if (evt->cmnd && evt->cmnd->device == sdev) {
1775 found_evt = evt;
1776 break;
1777 }
1778 }
1779
1780 if (!found_evt) {
1781 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1782 sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
1783 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1784 return 0;
1785 }
1786
1787 if (vhost->state == IBMVFC_ACTIVE) {
1788 evt = ibmvfc_get_event(vhost);
1789 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1790
1791 tmf = &evt->iu.tmf;
1792 memset(tmf, 0, sizeof(*tmf));
1793 tmf->common.version = 1;
1794 tmf->common.opcode = IBMVFC_TMF_MAD;
1795 tmf->common.length = sizeof(*tmf);
1796 tmf->scsi_id = rport->port_id;
1797 int_to_scsilun(sdev->lun, &tmf->lun);
1798 tmf->flags = (type | IBMVFC_TMF_LUA_VALID);
1799 tmf->cancel_key = (unsigned long)sdev->hostdata;
1800 tmf->my_cancel_key = (IBMVFC_TMF_CANCEL_KEY | (unsigned long)sdev->hostdata);
1801
1802 evt->sync_iu = &rsp;
1803 init_completion(&evt->comp);
1804 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1805 }
1806
1807 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1808
1809 if (rsp_rc != 0) {
1810 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
1811 return -EIO;
1812 }
1813
1814 sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
1815
1816 wait_for_completion(&evt->comp);
1817 status = rsp.mad_common.status;
1818 spin_lock_irqsave(vhost->host->host_lock, flags);
1819 ibmvfc_free_event(evt);
1820 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1821
1822 if (status != IBMVFC_MAD_SUCCESS) {
1823 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
1824 return -EIO;
1825 }
1826
1827 sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
1828 return 0;
1829}
1830
1831/**
1832 * ibmvfc_eh_abort_handler - Abort a command
1833 * @cmd: scsi command to abort
1834 *
1835 * Returns:
1836 * SUCCESS / FAILED
1837 **/
1838static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
1839{
1840 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1841 struct ibmvfc_event *evt, *pos;
1842 int cancel_rc, abort_rc;
1843 unsigned long flags;
1844
1845 ENTER;
1846 ibmvfc_wait_while_resetting(vhost);
1847 cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_ABORT_TASK_SET);
1848 abort_rc = ibmvfc_abort_task_set(cmd->device);
1849
1850 if (!cancel_rc && !abort_rc) {
1851 spin_lock_irqsave(vhost->host->host_lock, flags);
1852 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1853 if (evt->cmnd && evt->cmnd->device == cmd->device)
1854 ibmvfc_fail_request(evt, DID_ABORT);
1855 }
1856 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1857 LEAVE;
1858 return SUCCESS;
1859 }
1860
1861 LEAVE;
1862 return FAILED;
1863}
1864
1865/**
1866 * ibmvfc_eh_device_reset_handler - Reset a single LUN
1867 * @cmd: scsi command struct
1868 *
1869 * Returns:
1870 * SUCCESS / FAILED
1871 **/
1872static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
1873{
1874 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1875 struct ibmvfc_event *evt, *pos;
1876 int cancel_rc, reset_rc;
1877 unsigned long flags;
1878
1879 ENTER;
1880 ibmvfc_wait_while_resetting(vhost);
1881 cancel_rc = ibmvfc_cancel_all(cmd->device, IBMVFC_TMF_LUN_RESET);
1882 reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_LUN_RESET, "LUN");
1883
1884 if (!cancel_rc && !reset_rc) {
1885 spin_lock_irqsave(vhost->host->host_lock, flags);
1886 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1887 if (evt->cmnd && evt->cmnd->device == cmd->device)
1888 ibmvfc_fail_request(evt, DID_ABORT);
1889 }
1890 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1891 LEAVE;
1892 return SUCCESS;
1893 }
1894
1895 LEAVE;
1896 return FAILED;
1897}
1898
1899/**
1900 * ibmvfc_dev_cancel_all - Device iterated cancel all function
1901 * @sdev: scsi device struct
1902 * @data: return code
1903 *
1904 **/
1905static void ibmvfc_dev_cancel_all(struct scsi_device *sdev, void *data)
1906{
1907 unsigned long *rc = data;
1908 *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
1909}
1910
1911/**
1912 * ibmvfc_dev_abort_all - Device iterated abort task set function
1913 * @sdev: scsi device struct
1914 * @data: return code
1915 *
1916 **/
1917static void ibmvfc_dev_abort_all(struct scsi_device *sdev, void *data)
1918{
1919 unsigned long *rc = data;
1920 *rc |= ibmvfc_abort_task_set(sdev);
1921}
1922
1923/**
1924 * ibmvfc_eh_target_reset_handler - Reset the target
1925 * @cmd: scsi command struct
1926 *
1927 * Returns:
1928 * SUCCESS / FAILED
1929 **/
1930static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
1931{
1932 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1933 struct scsi_target *starget = scsi_target(cmd->device);
1934 struct ibmvfc_event *evt, *pos;
1935 int reset_rc;
1936 unsigned long cancel_rc = 0;
1937 unsigned long flags;
1938
1939 ENTER;
1940 ibmvfc_wait_while_resetting(vhost);
1941 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
1942 reset_rc = ibmvfc_reset_device(cmd->device, IBMVFC_TARGET_RESET, "target");
1943
1944 if (!cancel_rc && !reset_rc) {
1945 spin_lock_irqsave(vhost->host->host_lock, flags);
1946 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1947 if (evt->cmnd && scsi_target(evt->cmnd->device) == starget)
1948 ibmvfc_fail_request(evt, DID_ABORT);
1949 }
1950 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1951 LEAVE;
1952 return SUCCESS;
1953 }
1954
1955 LEAVE;
1956 return FAILED;
1957}
1958
1959/**
1960 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
1961 * @cmd: struct scsi_cmnd having problems
1962 *
1963 **/
1964static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
1965{
1966 int rc;
1967 struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
1968
1969 dev_err(vhost->dev, "Resetting connection due to error recovery\n");
1970 rc = ibmvfc_issue_fc_host_lip(vhost->host);
1971 return rc ? FAILED : SUCCESS;
1972}
1973
1974/**
1975 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
1976 * @rport: rport struct
1977 *
1978 * Return value:
1979 * none
1980 **/
1981static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
1982{
1983 struct scsi_target *starget = to_scsi_target(&rport->dev);
1984 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1985 struct ibmvfc_host *vhost = shost_priv(shost);
1986 struct ibmvfc_event *evt, *pos;
1987 unsigned long cancel_rc = 0;
1988 unsigned long abort_rc = 0;
1989 unsigned long flags;
1990
1991 ENTER;
1992 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all);
1993 starget_for_each_device(starget, &abort_rc, ibmvfc_dev_abort_all);
1994
1995 if (!cancel_rc && !abort_rc) {
1996 spin_lock_irqsave(shost->host_lock, flags);
1997 list_for_each_entry_safe(evt, pos, &vhost->sent, queue) {
1998 if (evt->cmnd && scsi_target(evt->cmnd->device) == starget)
1999 ibmvfc_fail_request(evt, DID_ABORT);
2000 }
2001 spin_unlock_irqrestore(shost->host_lock, flags);
2002 } else
2003 ibmvfc_issue_fc_host_lip(shost);
2004
2005 scsi_target_unblock(&rport->dev);
2006 LEAVE;
2007}
2008
2009static const struct {
2010 enum ibmvfc_async_event ae;
2011 const char *desc;
2012} ae_desc [] = {
2013 { IBMVFC_AE_ELS_PLOGI, "PLOGI" },
2014 { IBMVFC_AE_ELS_LOGO, "LOGO" },
2015 { IBMVFC_AE_ELS_PRLO, "PRLO" },
2016 { IBMVFC_AE_SCN_NPORT, "N-Port SCN" },
2017 { IBMVFC_AE_SCN_GROUP, "Group SCN" },
2018 { IBMVFC_AE_SCN_DOMAIN, "Domain SCN" },
2019 { IBMVFC_AE_SCN_FABRIC, "Fabric SCN" },
2020 { IBMVFC_AE_LINK_UP, "Link Up" },
2021 { IBMVFC_AE_LINK_DOWN, "Link Down" },
2022 { IBMVFC_AE_LINK_DEAD, "Link Dead" },
2023 { IBMVFC_AE_HALT, "Halt" },
2024 { IBMVFC_AE_RESUME, "Resume" },
2025 { IBMVFC_AE_ADAPTER_FAILED, "Adapter Failed" },
2026};
2027
2028static const char *unknown_ae = "Unknown async";
2029
2030/**
2031 * ibmvfc_get_ae_desc - Get text description for async event
2032 * @ae: async event
2033 *
2034 **/
2035static const char *ibmvfc_get_ae_desc(u64 ae)
2036{
2037 int i;
2038
2039 for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2040 if (ae_desc[i].ae == ae)
2041 return ae_desc[i].desc;
2042
2043 return unknown_ae;
2044}
2045
2046/**
2047 * ibmvfc_handle_async - Handle an async event from the adapter
2048 * @crq: crq to process
2049 * @vhost: ibmvfc host struct
2050 *
2051 **/
2052static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2053 struct ibmvfc_host *vhost)
2054{
2055 const char *desc = ibmvfc_get_ae_desc(crq->event);
2056
2057 ibmvfc_log(vhost, 2, "%s event received\n", desc);
2058
2059 switch (crq->event) {
2060 case IBMVFC_AE_LINK_UP:
2061 case IBMVFC_AE_RESUME:
2062 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2063 ibmvfc_init_host(vhost);
2064 break;
2065 case IBMVFC_AE_SCN_FABRIC:
2066 vhost->events_to_log |= IBMVFC_AE_RSCN;
2067 ibmvfc_init_host(vhost);
2068 break;
2069 case IBMVFC_AE_SCN_NPORT:
2070 case IBMVFC_AE_SCN_GROUP:
2071 case IBMVFC_AE_SCN_DOMAIN:
2072 vhost->events_to_log |= IBMVFC_AE_RSCN;
2073 case IBMVFC_AE_ELS_LOGO:
2074 case IBMVFC_AE_ELS_PRLO:
2075 case IBMVFC_AE_ELS_PLOGI:
2076 ibmvfc_reinit_host(vhost);
2077 break;
2078 case IBMVFC_AE_LINK_DOWN:
2079 case IBMVFC_AE_ADAPTER_FAILED:
2080 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2081 break;
2082 case IBMVFC_AE_LINK_DEAD:
2083 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2084 break;
2085 case IBMVFC_AE_HALT:
2086 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2087 break;
2088 default:
2089 dev_err(vhost->dev, "Unknown async event received: %ld\n", crq->event);
2090 break;
2091 };
2092}
2093
2094/**
2095 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2096 * @crq: Command/Response queue
2097 * @vhost: ibmvfc host struct
2098 *
2099 **/
2100static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2101{
2102 long rc;
2103 struct ibmvfc_event *evt = (struct ibmvfc_event *)crq->ioba;
2104
2105 switch (crq->valid) {
2106 case IBMVFC_CRQ_INIT_RSP:
2107 switch (crq->format) {
2108 case IBMVFC_CRQ_INIT:
2109 dev_info(vhost->dev, "Partner initialized\n");
2110 /* Send back a response */
2111 rc = ibmvfc_send_crq_init_complete(vhost);
2112 if (rc == 0)
2113 ibmvfc_init_host(vhost);
2114 else
2115 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2116 break;
2117 case IBMVFC_CRQ_INIT_COMPLETE:
2118 dev_info(vhost->dev, "Partner initialization complete\n");
2119 ibmvfc_init_host(vhost);
2120 break;
2121 default:
2122 dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2123 }
2124 return;
2125 case IBMVFC_CRQ_XPORT_EVENT:
2126 vhost->state = IBMVFC_NO_CRQ;
2127 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2128 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2129 /* We need to re-setup the interpartition connection */
2130 dev_info(vhost->dev, "Re-enabling adapter\n");
2131 vhost->client_migrated = 1;
2132 ibmvfc_purge_requests(vhost, DID_REQUEUE);
2133 if ((rc = ibmvfc_reenable_crq_queue(vhost)) ||
2134 (rc = ibmvfc_send_crq_init(vhost))) {
2135 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2136 dev_err(vhost->dev, "Error after enable (rc=%ld)\n", rc);
2137 } else
2138 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2139 } else {
2140 dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2141
2142 ibmvfc_purge_requests(vhost, DID_ERROR);
2143 if ((rc = ibmvfc_reset_crq(vhost)) ||
2144 (rc = ibmvfc_send_crq_init(vhost))) {
2145 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2146 dev_err(vhost->dev, "Error after reset (rc=%ld)\n", rc);
2147 } else
2148 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2149 }
2150 return;
2151 case IBMVFC_CRQ_CMD_RSP:
2152 break;
2153 default:
2154 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2155 return;
2156 }
2157
2158 if (crq->format == IBMVFC_ASYNC_EVENT)
2159 return;
2160
2161 /* The only kind of payload CRQs we should get are responses to
2162 * things we send. Make sure this response is to something we
2163 * actually sent
2164 */
2165 if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2166 dev_err(vhost->dev, "Returned correlation_token 0x%08lx is invalid!\n",
2167 crq->ioba);
2168 return;
2169 }
2170
2171 if (unlikely(atomic_read(&evt->free))) {
2172 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08lx!\n",
2173 crq->ioba);
2174 return;
2175 }
2176
2177 del_timer(&evt->timer);
2178 list_del(&evt->queue);
2179 ibmvfc_trc_end(evt);
2180 evt->done(evt);
2181}
2182
2183/**
2184 * ibmvfc_scan_finished - Check if the device scan is done.
2185 * @shost: scsi host struct
2186 * @time: current elapsed time
2187 *
2188 * Returns:
2189 * 0 if scan is not done / 1 if scan is done
2190 **/
2191static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2192{
2193 unsigned long flags;
2194 struct ibmvfc_host *vhost = shost_priv(shost);
2195 int done = 0;
2196
2197 spin_lock_irqsave(shost->host_lock, flags);
2198 if (time >= (init_timeout * HZ)) {
2199 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2200 "continuing initialization\n", init_timeout);
2201 done = 1;
2202 }
2203
2204 if (vhost->state != IBMVFC_NO_CRQ && vhost->action == IBMVFC_HOST_ACTION_NONE)
2205 done = 1;
2206 spin_unlock_irqrestore(shost->host_lock, flags);
2207 return done;
2208}
2209
2210/**
2211 * ibmvfc_slave_alloc - Setup the device's task set value
2212 * @sdev: struct scsi_device device to configure
2213 *
2214 * Set the device's task set value so that error handling works as
2215 * expected.
2216 *
2217 * Returns:
2218 * 0 on success / -ENXIO if device does not exist
2219 **/
2220static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2221{
2222 struct Scsi_Host *shost = sdev->host;
2223 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2224 struct ibmvfc_host *vhost = shost_priv(shost);
2225 unsigned long flags = 0;
2226
2227 if (!rport || fc_remote_port_chkready(rport))
2228 return -ENXIO;
2229
2230 spin_lock_irqsave(shost->host_lock, flags);
2231 sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2232 spin_unlock_irqrestore(shost->host_lock, flags);
2233 return 0;
2234}
2235
2236/**
2237 * ibmvfc_slave_configure - Configure the device
2238 * @sdev: struct scsi_device device to configure
2239 *
2240 * Enable allow_restart for a device if it is a disk. Adjust the
2241 * queue_depth here also.
2242 *
2243 * Returns:
2244 * 0
2245 **/
2246static int ibmvfc_slave_configure(struct scsi_device *sdev)
2247{
2248 struct Scsi_Host *shost = sdev->host;
2249 struct fc_rport *rport = starget_to_rport(sdev->sdev_target);
2250 unsigned long flags = 0;
2251
2252 spin_lock_irqsave(shost->host_lock, flags);
2253 if (sdev->type == TYPE_DISK)
2254 sdev->allow_restart = 1;
2255
2256 if (sdev->tagged_supported) {
2257 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2258 scsi_activate_tcq(sdev, sdev->queue_depth);
2259 } else
2260 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2261
2262 rport->dev_loss_tmo = dev_loss_tmo;
2263 spin_unlock_irqrestore(shost->host_lock, flags);
2264 return 0;
2265}
2266
2267/**
2268 * ibmvfc_change_queue_depth - Change the device's queue depth
2269 * @sdev: scsi device struct
2270 * @qdepth: depth to set
2271 *
2272 * Return value:
2273 * actual depth set
2274 **/
2275static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2276{
2277 if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2278 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2279
2280 scsi_adjust_queue_depth(sdev, 0, qdepth);
2281 return sdev->queue_depth;
2282}
2283
2284/**
2285 * ibmvfc_change_queue_type - Change the device's queue type
2286 * @sdev: scsi device struct
2287 * @tag_type: type of tags to use
2288 *
2289 * Return value:
2290 * actual queue type set
2291 **/
2292static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2293{
2294 if (sdev->tagged_supported) {
2295 scsi_set_tag_type(sdev, tag_type);
2296
2297 if (tag_type)
2298 scsi_activate_tcq(sdev, sdev->queue_depth);
2299 else
2300 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2301 } else
2302 tag_type = 0;
2303
2304 return tag_type;
2305}
2306
2307static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2308 struct device_attribute *attr, char *buf)
2309{
2310 struct Scsi_Host *shost = class_to_shost(dev);
2311 struct ibmvfc_host *vhost = shost_priv(shost);
2312
2313 return snprintf(buf, PAGE_SIZE, "%s\n",
2314 vhost->login_buf->resp.partition_name);
2315}
2316
2317static struct device_attribute ibmvfc_host_partition_name = {
2318 .attr = {
2319 .name = "partition_name",
2320 .mode = S_IRUGO,
2321 },
2322 .show = ibmvfc_show_host_partition_name,
2323};
2324
2325static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2326 struct device_attribute *attr, char *buf)
2327{
2328 struct Scsi_Host *shost = class_to_shost(dev);
2329 struct ibmvfc_host *vhost = shost_priv(shost);
2330
2331 return snprintf(buf, PAGE_SIZE, "%s\n",
2332 vhost->login_buf->resp.device_name);
2333}
2334
2335static struct device_attribute ibmvfc_host_device_name = {
2336 .attr = {
2337 .name = "device_name",
2338 .mode = S_IRUGO,
2339 },
2340 .show = ibmvfc_show_host_device_name,
2341};
2342
2343static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2344 struct device_attribute *attr, char *buf)
2345{
2346 struct Scsi_Host *shost = class_to_shost(dev);
2347 struct ibmvfc_host *vhost = shost_priv(shost);
2348
2349 return snprintf(buf, PAGE_SIZE, "%s\n",
2350 vhost->login_buf->resp.port_loc_code);
2351}
2352
2353static struct device_attribute ibmvfc_host_loc_code = {
2354 .attr = {
2355 .name = "port_loc_code",
2356 .mode = S_IRUGO,
2357 },
2358 .show = ibmvfc_show_host_loc_code,
2359};
2360
2361static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2362 struct device_attribute *attr, char *buf)
2363{
2364 struct Scsi_Host *shost = class_to_shost(dev);
2365 struct ibmvfc_host *vhost = shost_priv(shost);
2366
2367 return snprintf(buf, PAGE_SIZE, "%s\n",
2368 vhost->login_buf->resp.drc_name);
2369}
2370
2371static struct device_attribute ibmvfc_host_drc_name = {
2372 .attr = {
2373 .name = "drc_name",
2374 .mode = S_IRUGO,
2375 },
2376 .show = ibmvfc_show_host_drc_name,
2377};
2378
2379static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2380 struct device_attribute *attr, char *buf)
2381{
2382 struct Scsi_Host *shost = class_to_shost(dev);
2383 struct ibmvfc_host *vhost = shost_priv(shost);
2384 return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2385}
2386
2387static struct device_attribute ibmvfc_host_npiv_version = {
2388 .attr = {
2389 .name = "npiv_version",
2390 .mode = S_IRUGO,
2391 },
2392 .show = ibmvfc_show_host_npiv_version,
2393};
2394
2395/**
2396 * ibmvfc_show_log_level - Show the adapter's error logging level
2397 * @dev: class device struct
2398 * @buf: buffer
2399 *
2400 * Return value:
2401 * number of bytes printed to buffer
2402 **/
2403static ssize_t ibmvfc_show_log_level(struct device *dev,
2404 struct device_attribute *attr, char *buf)
2405{
2406 struct Scsi_Host *shost = class_to_shost(dev);
2407 struct ibmvfc_host *vhost = shost_priv(shost);
2408 unsigned long flags = 0;
2409 int len;
2410
2411 spin_lock_irqsave(shost->host_lock, flags);
2412 len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2413 spin_unlock_irqrestore(shost->host_lock, flags);
2414 return len;
2415}
2416
2417/**
2418 * ibmvfc_store_log_level - Change 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_store_log_level(struct device *dev,
2426 struct device_attribute *attr,
2427 const char *buf, size_t count)
2428{
2429 struct Scsi_Host *shost = class_to_shost(dev);
2430 struct ibmvfc_host *vhost = shost_priv(shost);
2431 unsigned long flags = 0;
2432
2433 spin_lock_irqsave(shost->host_lock, flags);
2434 vhost->log_level = simple_strtoul(buf, NULL, 10);
2435 spin_unlock_irqrestore(shost->host_lock, flags);
2436 return strlen(buf);
2437}
2438
2439static struct device_attribute ibmvfc_log_level_attr = {
2440 .attr = {
2441 .name = "log_level",
2442 .mode = S_IRUGO | S_IWUSR,
2443 },
2444 .show = ibmvfc_show_log_level,
2445 .store = ibmvfc_store_log_level
2446};
2447
2448#ifdef CONFIG_SCSI_IBMVFC_TRACE
2449/**
2450 * ibmvfc_read_trace - Dump the adapter trace
2451 * @kobj: kobject struct
2452 * @bin_attr: bin_attribute struct
2453 * @buf: buffer
2454 * @off: offset
2455 * @count: buffer size
2456 *
2457 * Return value:
2458 * number of bytes printed to buffer
2459 **/
2460static ssize_t ibmvfc_read_trace(struct kobject *kobj,
2461 struct bin_attribute *bin_attr,
2462 char *buf, loff_t off, size_t count)
2463{
2464 struct device *dev = container_of(kobj, struct device, kobj);
2465 struct Scsi_Host *shost = class_to_shost(dev);
2466 struct ibmvfc_host *vhost = shost_priv(shost);
2467 unsigned long flags = 0;
2468 int size = IBMVFC_TRACE_SIZE;
2469 char *src = (char *)vhost->trace;
2470
2471 if (off > size)
2472 return 0;
2473 if (off + count > size) {
2474 size -= off;
2475 count = size;
2476 }
2477
2478 spin_lock_irqsave(shost->host_lock, flags);
2479 memcpy(buf, &src[off], count);
2480 spin_unlock_irqrestore(shost->host_lock, flags);
2481 return count;
2482}
2483
2484static struct bin_attribute ibmvfc_trace_attr = {
2485 .attr = {
2486 .name = "trace",
2487 .mode = S_IRUGO,
2488 },
2489 .size = 0,
2490 .read = ibmvfc_read_trace,
2491};
2492#endif
2493
2494static struct device_attribute *ibmvfc_attrs[] = {
2495 &ibmvfc_host_partition_name,
2496 &ibmvfc_host_device_name,
2497 &ibmvfc_host_loc_code,
2498 &ibmvfc_host_drc_name,
2499 &ibmvfc_host_npiv_version,
2500 &ibmvfc_log_level_attr,
2501 NULL
2502};
2503
2504static struct scsi_host_template driver_template = {
2505 .module = THIS_MODULE,
2506 .name = "IBM POWER Virtual FC Adapter",
2507 .proc_name = IBMVFC_NAME,
2508 .queuecommand = ibmvfc_queuecommand,
2509 .eh_abort_handler = ibmvfc_eh_abort_handler,
2510 .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
2511 .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
2512 .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
2513 .slave_alloc = ibmvfc_slave_alloc,
2514 .slave_configure = ibmvfc_slave_configure,
2515 .scan_finished = ibmvfc_scan_finished,
2516 .change_queue_depth = ibmvfc_change_queue_depth,
2517 .change_queue_type = ibmvfc_change_queue_type,
2518 .cmd_per_lun = 16,
2519 .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
2520 .this_id = -1,
2521 .sg_tablesize = SG_ALL,
2522 .max_sectors = IBMVFC_MAX_SECTORS,
2523 .use_clustering = ENABLE_CLUSTERING,
2524 .shost_attrs = ibmvfc_attrs,
2525};
2526
2527/**
2528 * ibmvfc_next_async_crq - Returns the next entry in async queue
2529 * @vhost: ibmvfc host struct
2530 *
2531 * Returns:
2532 * Pointer to next entry in queue / NULL if empty
2533 **/
2534static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
2535{
2536 struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
2537 struct ibmvfc_async_crq *crq;
2538
2539 crq = &async_crq->msgs[async_crq->cur];
2540 if (crq->valid & 0x80) {
2541 if (++async_crq->cur == async_crq->size)
2542 async_crq->cur = 0;
2543 } else
2544 crq = NULL;
2545
2546 return crq;
2547}
2548
2549/**
2550 * ibmvfc_next_crq - Returns the next entry in message queue
2551 * @vhost: ibmvfc host struct
2552 *
2553 * Returns:
2554 * Pointer to next entry in queue / NULL if empty
2555 **/
2556static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
2557{
2558 struct ibmvfc_crq_queue *queue = &vhost->crq;
2559 struct ibmvfc_crq *crq;
2560
2561 crq = &queue->msgs[queue->cur];
2562 if (crq->valid & 0x80) {
2563 if (++queue->cur == queue->size)
2564 queue->cur = 0;
2565 } else
2566 crq = NULL;
2567
2568 return crq;
2569}
2570
2571/**
2572 * ibmvfc_interrupt - Interrupt handler
2573 * @irq: number of irq to handle, not used
2574 * @dev_instance: ibmvfc_host that received interrupt
2575 *
2576 * Returns:
2577 * IRQ_HANDLED
2578 **/
2579static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
2580{
2581 struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
2582 struct vio_dev *vdev = to_vio_dev(vhost->dev);
2583 struct ibmvfc_crq *crq;
2584 struct ibmvfc_async_crq *async;
2585 unsigned long flags;
2586 int done = 0;
2587
2588 spin_lock_irqsave(vhost->host->host_lock, flags);
2589 vio_disable_interrupts(to_vio_dev(vhost->dev));
2590 while (!done) {
2591 /* Pull all the valid messages off the CRQ */
2592 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2593 ibmvfc_handle_crq(crq, vhost);
2594 crq->valid = 0;
2595 }
2596
2597 /* Pull all the valid messages off the async CRQ */
2598 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2599 ibmvfc_handle_async(async, vhost);
2600 async->valid = 0;
2601 }
2602
2603 vio_enable_interrupts(vdev);
2604 if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
2605 vio_disable_interrupts(vdev);
2606 ibmvfc_handle_crq(crq, vhost);
2607 crq->valid = 0;
2608 } else if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
2609 vio_disable_interrupts(vdev);
2610 ibmvfc_handle_async(async, vhost);
2611 crq->valid = 0;
2612 } else
2613 done = 1;
2614 }
2615
2616 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2617 return IRQ_HANDLED;
2618}
2619
2620/**
2621 * ibmvfc_init_tgt - Set the next init job step for the target
2622 * @tgt: ibmvfc target struct
2623 * @job_step: job step to perform
2624 *
2625 **/
2626static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
2627 void (*job_step) (struct ibmvfc_target *))
2628{
2629 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
2630 tgt->job_step = job_step;
2631 wake_up(&tgt->vhost->work_wait_q);
2632}
2633
2634/**
2635 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
2636 * @tgt: ibmvfc target struct
2637 * @job_step: initialization job step
2638 *
2639 **/
2640static void ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
2641 void (*job_step) (struct ibmvfc_target *))
2642{
2643 if (++tgt->init_retries > IBMVFC_MAX_INIT_RETRIES) {
2644 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2645 wake_up(&tgt->vhost->work_wait_q);
2646 } else
2647 ibmvfc_init_tgt(tgt, job_step);
2648}
2649
2650/**
2651 * ibmvfc_release_tgt - Free memory allocated for a target
2652 * @kref: kref struct
2653 *
2654 **/
2655static void ibmvfc_release_tgt(struct kref *kref)
2656{
2657 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
2658 kfree(tgt);
2659}
2660
2661/**
2662 * ibmvfc_tgt_prli_done - Completion handler for Process Login
2663 * @evt: ibmvfc event struct
2664 *
2665 **/
2666static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
2667{
2668 struct ibmvfc_target *tgt = evt->tgt;
2669 struct ibmvfc_host *vhost = evt->vhost;
2670 struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
2671 u32 status = rsp->common.status;
2672
2673 vhost->discovery_threads--;
2674 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2675 switch (status) {
2676 case IBMVFC_MAD_SUCCESS:
2677 tgt_dbg(tgt, "Process Login succeeded\n");
2678 tgt->need_login = 0;
2679 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_ADD_RPORT);
2680 break;
2681 case IBMVFC_MAD_DRIVER_FAILED:
2682 break;
2683 case IBMVFC_MAD_CRQ_ERROR:
2684 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2685 break;
2686 case IBMVFC_MAD_FAILED:
2687 default:
2688 tgt_err(tgt, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
2689 ibmvfc_get_cmd_error(rsp->status, rsp->error),
2690 rsp->status, rsp->error, status);
2691 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2692 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
2693 break;
2694 };
2695
2696 kref_put(&tgt->kref, ibmvfc_release_tgt);
2697 ibmvfc_free_event(evt);
2698 wake_up(&vhost->work_wait_q);
2699}
2700
2701/**
2702 * ibmvfc_tgt_send_prli - Send a process login
2703 * @tgt: ibmvfc target struct
2704 *
2705 **/
2706static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
2707{
2708 struct ibmvfc_process_login *prli;
2709 struct ibmvfc_host *vhost = tgt->vhost;
2710 struct ibmvfc_event *evt;
2711
2712 if (vhost->discovery_threads >= disc_threads)
2713 return;
2714
2715 kref_get(&tgt->kref);
2716 evt = ibmvfc_get_event(vhost);
2717 vhost->discovery_threads++;
2718 ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
2719 evt->tgt = tgt;
2720 prli = &evt->iu.prli;
2721 memset(prli, 0, sizeof(*prli));
2722 prli->common.version = 1;
2723 prli->common.opcode = IBMVFC_PROCESS_LOGIN;
2724 prli->common.length = sizeof(*prli);
2725 prli->scsi_id = tgt->scsi_id;
2726
2727 prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
2728 prli->parms.flags = IBMVFC_PRLI_EST_IMG_PAIR;
2729 prli->parms.service_parms = IBMVFC_PRLI_INITIATOR_FUNC;
2730
2731 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2732 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2733 vhost->discovery_threads--;
2734 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2735 kref_put(&tgt->kref, ibmvfc_release_tgt);
2736 } else
2737 tgt_dbg(tgt, "Sent process login\n");
2738}
2739
2740/**
2741 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
2742 * @evt: ibmvfc event struct
2743 *
2744 **/
2745static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
2746{
2747 struct ibmvfc_target *tgt = evt->tgt;
2748 struct ibmvfc_host *vhost = evt->vhost;
2749 struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
2750 u32 status = rsp->common.status;
2751
2752 vhost->discovery_threads--;
2753 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2754 switch (status) {
2755 case IBMVFC_MAD_SUCCESS:
2756 tgt_dbg(tgt, "Port Login succeeded\n");
2757 if (tgt->ids.port_name &&
2758 tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
2759 vhost->reinit = 1;
2760 tgt_dbg(tgt, "Port re-init required\n");
2761 break;
2762 }
2763 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
2764 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
2765 tgt->ids.port_id = tgt->scsi_id;
2766 tgt->ids.roles = FC_PORT_ROLE_FCP_TARGET;
2767 memcpy(&tgt->service_parms, &rsp->service_parms,
2768 sizeof(tgt->service_parms));
2769 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
2770 sizeof(tgt->service_parms_change));
2771 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
2772 break;
2773 case IBMVFC_MAD_DRIVER_FAILED:
2774 break;
2775 case IBMVFC_MAD_CRQ_ERROR:
2776 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2777 break;
2778 case IBMVFC_MAD_FAILED:
2779 default:
2780 tgt_err(tgt, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
2781 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
2782 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
2783 ibmvfc_get_ls_explain(rsp->fc_explain), rsp->fc_explain, status);
2784
2785 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2786 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
2787 break;
2788 };
2789
2790 kref_put(&tgt->kref, ibmvfc_release_tgt);
2791 ibmvfc_free_event(evt);
2792 wake_up(&vhost->work_wait_q);
2793}
2794
2795/**
2796 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
2797 * @tgt: ibmvfc target struct
2798 *
2799 **/
2800static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
2801{
2802 struct ibmvfc_port_login *plogi;
2803 struct ibmvfc_host *vhost = tgt->vhost;
2804 struct ibmvfc_event *evt;
2805
2806 if (vhost->discovery_threads >= disc_threads)
2807 return;
2808
2809 kref_get(&tgt->kref);
2810 evt = ibmvfc_get_event(vhost);
2811 vhost->discovery_threads++;
2812 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2813 ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
2814 evt->tgt = tgt;
2815 plogi = &evt->iu.plogi;
2816 memset(plogi, 0, sizeof(*plogi));
2817 plogi->common.version = 1;
2818 plogi->common.opcode = IBMVFC_PORT_LOGIN;
2819 plogi->common.length = sizeof(*plogi);
2820 plogi->scsi_id = tgt->scsi_id;
2821
2822 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2823 vhost->discovery_threads--;
2824 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2825 kref_put(&tgt->kref, ibmvfc_release_tgt);
2826 } else
2827 tgt_dbg(tgt, "Sent port login\n");
2828}
2829
2830/**
2831 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
2832 * @evt: ibmvfc event struct
2833 *
2834 **/
2835static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
2836{
2837 struct ibmvfc_target *tgt = evt->tgt;
2838 struct ibmvfc_host *vhost = evt->vhost;
2839 struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
2840 u32 status = rsp->common.status;
2841
2842 vhost->discovery_threads--;
2843 ibmvfc_free_event(evt);
2844 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2845
2846 switch (status) {
2847 case IBMVFC_MAD_SUCCESS:
2848 tgt_dbg(tgt, "Implicit Logout succeeded\n");
2849 break;
2850 case IBMVFC_MAD_DRIVER_FAILED:
2851 kref_put(&tgt->kref, ibmvfc_release_tgt);
2852 wake_up(&vhost->work_wait_q);
2853 return;
2854 case IBMVFC_MAD_FAILED:
2855 default:
2856 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
2857 break;
2858 };
2859
2860 if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
2861 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
2862 else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
2863 tgt->scsi_id != tgt->new_scsi_id)
2864 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2865 kref_put(&tgt->kref, ibmvfc_release_tgt);
2866 wake_up(&vhost->work_wait_q);
2867}
2868
2869/**
2870 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
2871 * @tgt: ibmvfc target struct
2872 *
2873 **/
2874static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
2875{
2876 struct ibmvfc_implicit_logout *mad;
2877 struct ibmvfc_host *vhost = tgt->vhost;
2878 struct ibmvfc_event *evt;
2879
2880 if (vhost->discovery_threads >= disc_threads)
2881 return;
2882
2883 kref_get(&tgt->kref);
2884 evt = ibmvfc_get_event(vhost);
2885 vhost->discovery_threads++;
2886 ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
2887 evt->tgt = tgt;
2888 mad = &evt->iu.implicit_logout;
2889 memset(mad, 0, sizeof(*mad));
2890 mad->common.version = 1;
2891 mad->common.opcode = IBMVFC_IMPLICIT_LOGOUT;
2892 mad->common.length = sizeof(*mad);
2893 mad->old_scsi_id = tgt->scsi_id;
2894
2895 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2896 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2897 vhost->discovery_threads--;
2898 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2899 kref_put(&tgt->kref, ibmvfc_release_tgt);
2900 } else
2901 tgt_dbg(tgt, "Sent Implicit Logout\n");
2902}
2903
2904/**
2905 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
2906 * @evt: ibmvfc event struct
2907 *
2908 **/
2909static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
2910{
2911 struct ibmvfc_target *tgt = evt->tgt;
2912 struct ibmvfc_host *vhost = evt->vhost;
2913 struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
2914 u32 status = rsp->common.status;
2915
2916 vhost->discovery_threads--;
2917 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2918 switch (status) {
2919 case IBMVFC_MAD_SUCCESS:
2920 tgt_dbg(tgt, "Query Target succeeded\n");
2921 tgt->new_scsi_id = rsp->scsi_id;
2922 if (rsp->scsi_id != tgt->scsi_id)
2923 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
2924 break;
2925 case IBMVFC_MAD_DRIVER_FAILED:
2926 break;
2927 case IBMVFC_MAD_CRQ_ERROR:
2928 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
2929 break;
2930 case IBMVFC_MAD_FAILED:
2931 default:
2932 tgt_err(tgt, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
2933 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error,
2934 ibmvfc_get_fc_type(rsp->fc_type), rsp->fc_type,
2935 ibmvfc_get_gs_explain(rsp->fc_explain), rsp->fc_explain, status);
2936
2937 if ((rsp->status & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
2938 rsp->error == IBMVFC_UNABLE_TO_PERFORM_REQ &&
2939 rsp->fc_explain == IBMVFC_PORT_NAME_NOT_REG)
2940 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2941 else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
2942 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
2943 break;
2944 };
2945
2946 kref_put(&tgt->kref, ibmvfc_release_tgt);
2947 ibmvfc_free_event(evt);
2948 wake_up(&vhost->work_wait_q);
2949}
2950
2951/**
2952 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
2953 * @tgt: ibmvfc target struct
2954 *
2955 **/
2956static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
2957{
2958 struct ibmvfc_query_tgt *query_tgt;
2959 struct ibmvfc_host *vhost = tgt->vhost;
2960 struct ibmvfc_event *evt;
2961
2962 if (vhost->discovery_threads >= disc_threads)
2963 return;
2964
2965 kref_get(&tgt->kref);
2966 evt = ibmvfc_get_event(vhost);
2967 vhost->discovery_threads++;
2968 evt->tgt = tgt;
2969 ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
2970 query_tgt = &evt->iu.query_tgt;
2971 memset(query_tgt, 0, sizeof(*query_tgt));
2972 query_tgt->common.version = 1;
2973 query_tgt->common.opcode = IBMVFC_QUERY_TARGET;
2974 query_tgt->common.length = sizeof(*query_tgt);
2975 query_tgt->wwpn = tgt->ids.port_name;
2976
2977 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
2978 if (ibmvfc_send_event(evt, vhost, default_timeout)) {
2979 vhost->discovery_threads--;
2980 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
2981 kref_put(&tgt->kref, ibmvfc_release_tgt);
2982 } else
2983 tgt_dbg(tgt, "Sent Query Target\n");
2984}
2985
2986/**
2987 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
2988 * @vhost: ibmvfc host struct
2989 * @scsi_id: SCSI ID to allocate target for
2990 *
2991 * Returns:
2992 * 0 on success / other on failure
2993 **/
2994static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
2995{
2996 struct ibmvfc_target *tgt;
2997 unsigned long flags;
2998
2999 spin_lock_irqsave(vhost->host->host_lock, flags);
3000 list_for_each_entry(tgt, &vhost->targets, queue) {
3001 if (tgt->scsi_id == scsi_id) {
3002 if (tgt->need_login)
3003 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3004 goto unlock_out;
3005 }
3006 }
3007 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3008
3009 tgt = mempool_alloc(vhost->tgt_pool, GFP_KERNEL);
3010 if (!tgt) {
3011 dev_err(vhost->dev, "Target allocation failure for scsi id %08lx\n",
3012 scsi_id);
3013 return -ENOMEM;
3014 }
3015
3016 tgt->scsi_id = scsi_id;
3017 tgt->new_scsi_id = scsi_id;
3018 tgt->vhost = vhost;
3019 tgt->need_login = 1;
3020 kref_init(&tgt->kref);
3021 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3022 spin_lock_irqsave(vhost->host->host_lock, flags);
3023 list_add_tail(&tgt->queue, &vhost->targets);
3024
3025unlock_out:
3026 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3027 return 0;
3028}
3029
3030/**
3031 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3032 * @vhost: ibmvfc host struct
3033 *
3034 * Returns:
3035 * 0 on success / other on failure
3036 **/
3037static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3038{
3039 int i, rc;
3040
3041 for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3042 rc = ibmvfc_alloc_target(vhost,
3043 vhost->disc_buf->scsi_id[i] & IBMVFC_DISC_TGT_SCSI_ID_MASK);
3044
3045 return rc;
3046}
3047
3048/**
3049 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3050 * @evt: ibmvfc event struct
3051 *
3052 **/
3053static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3054{
3055 struct ibmvfc_host *vhost = evt->vhost;
3056 struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3057 u32 mad_status = rsp->common.status;
3058
3059 switch (mad_status) {
3060 case IBMVFC_MAD_SUCCESS:
3061 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3062 vhost->num_targets = rsp->num_written;
3063 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3064 break;
3065 case IBMVFC_MAD_FAILED:
3066 dev_err(vhost->dev, "Discover Targets failed: %s (%x:%x)\n",
3067 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3068 ibmvfc_retry_host_init(vhost);
3069 break;
3070 case IBMVFC_MAD_DRIVER_FAILED:
3071 break;
3072 default:
3073 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3074 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3075 break;
3076 }
3077
3078 ibmvfc_free_event(evt);
3079 wake_up(&vhost->work_wait_q);
3080}
3081
3082/**
3083 * ibmvfc_discover_targets - Send Discover Targets MAD
3084 * @vhost: ibmvfc host struct
3085 *
3086 **/
3087static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3088{
3089 struct ibmvfc_discover_targets *mad;
3090 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3091
3092 ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3093 mad = &evt->iu.discover_targets;
3094 memset(mad, 0, sizeof(*mad));
3095 mad->common.version = 1;
3096 mad->common.opcode = IBMVFC_DISC_TARGETS;
3097 mad->common.length = sizeof(*mad);
3098 mad->bufflen = vhost->disc_buf_sz;
3099 mad->buffer.va = vhost->disc_buf_dma;
3100 mad->buffer.len = vhost->disc_buf_sz;
3101 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3102
3103 if (!ibmvfc_send_event(evt, vhost, default_timeout))
3104 ibmvfc_dbg(vhost, "Sent discover targets\n");
3105 else
3106 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3107}
3108
3109/**
3110 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
3111 * @evt: ibmvfc event struct
3112 *
3113 **/
3114static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
3115{
3116 struct ibmvfc_host *vhost = evt->vhost;
3117 u32 mad_status = evt->xfer_iu->npiv_login.common.status;
3118 struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
3119 unsigned int npiv_max_sectors;
3120
3121 switch (mad_status) {
3122 case IBMVFC_MAD_SUCCESS:
3123 ibmvfc_free_event(evt);
3124 break;
3125 case IBMVFC_MAD_FAILED:
3126 dev_err(vhost->dev, "NPIV Login failed: %s (%x:%x)\n",
3127 ibmvfc_get_cmd_error(rsp->status, rsp->error), rsp->status, rsp->error);
3128 if (ibmvfc_retry_cmd(rsp->status, rsp->error))
3129 ibmvfc_retry_host_init(vhost);
3130 else
3131 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3132 ibmvfc_free_event(evt);
3133 return;
3134 case IBMVFC_MAD_CRQ_ERROR:
3135 ibmvfc_retry_host_init(vhost);
3136 case IBMVFC_MAD_DRIVER_FAILED:
3137 ibmvfc_free_event(evt);
3138 return;
3139 default:
3140 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
3141 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3142 ibmvfc_free_event(evt);
3143 return;
3144 }
3145
3146 vhost->client_migrated = 0;
3147
3148 if (!(rsp->flags & IBMVFC_NATIVE_FC)) {
3149 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
3150 rsp->flags);
3151 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3152 wake_up(&vhost->work_wait_q);
3153 return;
3154 }
3155
3156 if (rsp->max_cmds <= IBMVFC_NUM_INTERNAL_REQ) {
3157 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
3158 rsp->max_cmds);
3159 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3160 wake_up(&vhost->work_wait_q);
3161 return;
3162 }
3163
3164 npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
3165 dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
3166 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
3167 rsp->drc_name, npiv_max_sectors);
3168
3169 fc_host_fabric_name(vhost->host) = rsp->node_name;
3170 fc_host_node_name(vhost->host) = rsp->node_name;
3171 fc_host_port_name(vhost->host) = rsp->port_name;
3172 fc_host_port_id(vhost->host) = rsp->scsi_id;
3173 fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
3174 fc_host_supported_classes(vhost->host) = 0;
3175 if (rsp->service_parms.class1_parms[0] & 0x80000000)
3176 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
3177 if (rsp->service_parms.class2_parms[0] & 0x80000000)
3178 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
3179 if (rsp->service_parms.class3_parms[0] & 0x80000000)
3180 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
3181 fc_host_maxframe_size(vhost->host) =
3182 rsp->service_parms.common.bb_rcv_sz & 0x0fff;
3183
3184 vhost->host->can_queue = rsp->max_cmds - IBMVFC_NUM_INTERNAL_REQ;
3185 vhost->host->max_sectors = npiv_max_sectors;
3186 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3187 wake_up(&vhost->work_wait_q);
3188}
3189
3190/**
3191 * ibmvfc_npiv_login - Sends NPIV login
3192 * @vhost: ibmvfc host struct
3193 *
3194 **/
3195static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
3196{
3197 struct ibmvfc_npiv_login_mad *mad;
3198 struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3199
3200 ibmvfc_gather_partition_info(vhost);
3201 ibmvfc_set_login_info(vhost);
3202 ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
3203
3204 memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
3205 mad = &evt->iu.npiv_login;
3206 memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
3207 mad->common.version = 1;
3208 mad->common.opcode = IBMVFC_NPIV_LOGIN;
3209 mad->common.length = sizeof(struct ibmvfc_npiv_login_mad);
3210 mad->buffer.va = vhost->login_buf_dma;
3211 mad->buffer.len = sizeof(*vhost->login_buf);
3212
3213 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
3214 vhost->async_crq.cur = 0;
3215 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3216
3217 if (!ibmvfc_send_event(evt, vhost, default_timeout))
3218 ibmvfc_dbg(vhost, "Sent NPIV login\n");
3219 else
3220 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3221};
3222
3223/**
3224 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
3225 * @vhost: ibmvfc host struct
3226 *
3227 * Returns:
3228 * 1 if work to do / 0 if not
3229 **/
3230static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
3231{
3232 struct ibmvfc_target *tgt;
3233
3234 list_for_each_entry(tgt, &vhost->targets, queue) {
3235 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
3236 tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3237 return 1;
3238 }
3239
3240 return 0;
3241}
3242
3243/**
3244 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
3245 * @vhost: ibmvfc host struct
3246 *
3247 * Returns:
3248 * 1 if work to do / 0 if not
3249 **/
3250static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3251{
3252 struct ibmvfc_target *tgt;
3253
3254 if (kthread_should_stop())
3255 return 1;
3256 switch (vhost->action) {
3257 case IBMVFC_HOST_ACTION_NONE:
3258 case IBMVFC_HOST_ACTION_INIT_WAIT:
3259 return 0;
3260 case IBMVFC_HOST_ACTION_TGT_INIT:
3261 case IBMVFC_HOST_ACTION_QUERY_TGTS:
3262 if (vhost->discovery_threads == disc_threads)
3263 return 0;
3264 list_for_each_entry(tgt, &vhost->targets, queue)
3265 if (tgt->action == IBMVFC_TGT_ACTION_INIT)
3266 return 1;
3267 list_for_each_entry(tgt, &vhost->targets, queue)
3268 if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
3269 return 0;
3270 return 1;
3271 case IBMVFC_HOST_ACTION_INIT:
3272 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3273 case IBMVFC_HOST_ACTION_TGT_ADD:
3274 case IBMVFC_HOST_ACTION_TGT_DEL:
3275 case IBMVFC_HOST_ACTION_QUERY:
3276 default:
3277 break;
3278 };
3279
3280 return 1;
3281}
3282
3283/**
3284 * ibmvfc_work_to_do - Is there task level work to do?
3285 * @vhost: ibmvfc host struct
3286 *
3287 * Returns:
3288 * 1 if work to do / 0 if not
3289 **/
3290static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
3291{
3292 unsigned long flags;
3293 int rc;
3294
3295 spin_lock_irqsave(vhost->host->host_lock, flags);
3296 rc = __ibmvfc_work_to_do(vhost);
3297 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3298 return rc;
3299}
3300
3301/**
3302 * ibmvfc_log_ae - Log async events if necessary
3303 * @vhost: ibmvfc host struct
3304 * @events: events to log
3305 *
3306 **/
3307static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
3308{
3309 if (events & IBMVFC_AE_RSCN)
3310 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
3311 if ((events & IBMVFC_AE_LINKDOWN) &&
3312 vhost->state >= IBMVFC_HALTED)
3313 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
3314 if ((events & IBMVFC_AE_LINKUP) &&
3315 vhost->state == IBMVFC_INITIALIZING)
3316 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
3317}
3318
3319/**
3320 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
3321 * @tgt: ibmvfc target struct
3322 *
3323 **/
3324static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
3325{
3326 struct ibmvfc_host *vhost = tgt->vhost;
3327 struct fc_rport *rport;
3328 unsigned long flags;
3329
3330 tgt_dbg(tgt, "Adding rport\n");
3331 rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
3332 spin_lock_irqsave(vhost->host->host_lock, flags);
3333 tgt->rport = rport;
3334 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3335 if (rport) {
3336 tgt_dbg(tgt, "rport add succeeded\n");
3337 rport->maxframe_size = tgt->service_parms.common.bb_rcv_sz & 0x0fff;
3338 rport->supported_classes = 0;
3339 if (tgt->service_parms.class1_parms[0] & 0x80000000)
3340 rport->supported_classes |= FC_COS_CLASS1;
3341 if (tgt->service_parms.class2_parms[0] & 0x80000000)
3342 rport->supported_classes |= FC_COS_CLASS2;
3343 if (tgt->service_parms.class3_parms[0] & 0x80000000)
3344 rport->supported_classes |= FC_COS_CLASS3;
3345 } else
3346 tgt_dbg(tgt, "rport add failed\n");
3347 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3348}
3349
3350/**
3351 * ibmvfc_do_work - Do task level work
3352 * @vhost: ibmvfc host struct
3353 *
3354 **/
3355static void ibmvfc_do_work(struct ibmvfc_host *vhost)
3356{
3357 struct ibmvfc_target *tgt;
3358 unsigned long flags;
3359 struct fc_rport *rport;
3360
3361 ibmvfc_log_ae(vhost, vhost->events_to_log);
3362 spin_lock_irqsave(vhost->host->host_lock, flags);
3363 vhost->events_to_log = 0;
3364 switch (vhost->action) {
3365 case IBMVFC_HOST_ACTION_NONE:
3366 case IBMVFC_HOST_ACTION_INIT_WAIT:
3367 break;
3368 case IBMVFC_HOST_ACTION_INIT:
3369 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
3370 vhost->job_step(vhost);
3371 break;
3372 case IBMVFC_HOST_ACTION_QUERY:
3373 list_for_each_entry(tgt, &vhost->targets, queue)
3374 ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
3375 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
3376 break;
3377 case IBMVFC_HOST_ACTION_QUERY_TGTS:
3378 list_for_each_entry(tgt, &vhost->targets, queue) {
3379 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3380 tgt->job_step(tgt);
3381 break;
3382 }
3383 }
3384
3385 if (!ibmvfc_dev_init_to_do(vhost))
3386 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
3387 break;
3388 case IBMVFC_HOST_ACTION_TGT_DEL:
3389 list_for_each_entry(tgt, &vhost->targets, queue) {
3390 if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3391 tgt_dbg(tgt, "Deleting rport\n");
3392 rport = tgt->rport;
3393 tgt->rport = NULL;
3394 list_del(&tgt->queue);
3395 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3396 if (rport)
3397 fc_remote_port_delete(rport);
3398 kref_put(&tgt->kref, ibmvfc_release_tgt);
3399 return;
3400 }
3401 }
3402
3403 if (vhost->state == IBMVFC_INITIALIZING) {
3404 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
3405 vhost->job_step = ibmvfc_discover_targets;
3406 } else {
3407 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3408 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3409 scsi_unblock_requests(vhost->host);
3410 wake_up(&vhost->init_wait_q);
3411 return;
3412 }
3413 break;
3414 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
3415 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
3416 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3417 ibmvfc_alloc_targets(vhost);
3418 spin_lock_irqsave(vhost->host->host_lock, flags);
3419 break;
3420 case IBMVFC_HOST_ACTION_TGT_INIT:
3421 list_for_each_entry(tgt, &vhost->targets, queue) {
3422 if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
3423 tgt->job_step(tgt);
3424 break;
3425 }
3426 }
3427
3428 if (!ibmvfc_dev_init_to_do(vhost)) {
3429 ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
3430 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_ADD);
3431 vhost->init_retries = 0;
3432 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3433 scsi_unblock_requests(vhost->host);
3434 return;
3435 }
3436 break;
3437 case IBMVFC_HOST_ACTION_TGT_ADD:
3438 list_for_each_entry(tgt, &vhost->targets, queue) {
3439 if (tgt->action == IBMVFC_TGT_ACTION_ADD_RPORT) {
3440 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3441 ibmvfc_tgt_add_rport(tgt);
3442 return;
3443 } else if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
3444 tgt_dbg(tgt, "Deleting rport\n");
3445 rport = tgt->rport;
3446 tgt->rport = NULL;
3447 list_del(&tgt->queue);
3448 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3449 if (rport)
3450 fc_remote_port_delete(rport);
3451 kref_put(&tgt->kref, ibmvfc_release_tgt);
3452 return;
3453 }
3454 }
3455
3456 if (vhost->reinit) {
3457 vhost->reinit = 0;
3458 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
3459 } else {
3460 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3461 wake_up(&vhost->init_wait_q);
3462 }
3463 break;
3464 default:
3465 break;
3466 };
3467
3468 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3469}
3470
3471/**
3472 * ibmvfc_work - Do task level work
3473 * @data: ibmvfc host struct
3474 *
3475 * Returns:
3476 * zero
3477 **/
3478static int ibmvfc_work(void *data)
3479{
3480 struct ibmvfc_host *vhost = data;
3481 int rc;
3482
3483 set_user_nice(current, -20);
3484
3485 while (1) {
3486 rc = wait_event_interruptible(vhost->work_wait_q,
3487 ibmvfc_work_to_do(vhost));
3488
3489 BUG_ON(rc);
3490
3491 if (kthread_should_stop())
3492 break;
3493
3494 ibmvfc_do_work(vhost);
3495 }
3496
3497 ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
3498 return 0;
3499}
3500
3501/**
3502 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
3503 * @vhost: ibmvfc host struct
3504 *
3505 * Allocates a page for messages, maps it for dma, and registers
3506 * the crq with the hypervisor.
3507 *
3508 * Return value:
3509 * zero on success / other on failure
3510 **/
3511static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
3512{
3513 int rc, retrc = -ENOMEM;
3514 struct device *dev = vhost->dev;
3515 struct vio_dev *vdev = to_vio_dev(dev);
3516 struct ibmvfc_crq_queue *crq = &vhost->crq;
3517
3518 ENTER;
3519 crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
3520
3521 if (!crq->msgs)
3522 return -ENOMEM;
3523
3524 crq->size = PAGE_SIZE / sizeof(*crq->msgs);
3525 crq->msg_token = dma_map_single(dev, crq->msgs,
3526 PAGE_SIZE, DMA_BIDIRECTIONAL);
3527
8d8bb39b 3528 if (dma_mapping_error(dev, crq->msg_token))
072b91f9
BK		 3529 goto map_failed;
3530
3531 retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
3532 crq->msg_token, PAGE_SIZE);
3533
3534 if (rc == H_RESOURCE)
3535 /* maybe kexecing and resource is busy. try a reset */
3536 retrc = rc = ibmvfc_reset_crq(vhost);
3537
3538 if (rc == H_CLOSED)
3539 dev_warn(dev, "Partner adapter not ready\n");
3540 else if (rc) {
3541 dev_warn(dev, "Error %d opening adapter\n", rc);
3542 goto reg_crq_failed;
3543 }
3544
3545 retrc = 0;
3546
3547 if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
3548 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
3549 goto req_irq_failed;
3550 }
3551
3552 if ((rc = vio_enable_interrupts(vdev))) {
3553 dev_err(dev, "Error %d enabling interrupts\n", rc);
3554 goto req_irq_failed;
3555 }
3556
3557 crq->cur = 0;
3558 LEAVE;
3559 return retrc;
3560
3561req_irq_failed:
3562 do {
3563 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
3564 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
3565reg_crq_failed:
3566 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
3567map_failed:
3568 free_page((unsigned long)crq->msgs);
3569 return retrc;
3570}
3571
3572/**
3573 * ibmvfc_free_mem - Free memory for vhost
3574 * @vhost: ibmvfc host struct
3575 *
3576 * Return value:
3577 * none
3578 **/
3579static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
3580{
3581 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
3582
3583 ENTER;
3584 mempool_destroy(vhost->tgt_pool);
3585 kfree(vhost->trace);
3586 dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
3587 vhost->disc_buf_dma);
3588 dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
3589 vhost->login_buf, vhost->login_buf_dma);
3590 dma_pool_destroy(vhost->sg_pool);
3591 dma_unmap_single(vhost->dev, async_q->msg_token,
3592 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
3593 free_page((unsigned long)async_q->msgs);
3594 LEAVE;
3595}
3596
3597/**
3598 * ibmvfc_alloc_mem - Allocate memory for vhost
3599 * @vhost: ibmvfc host struct
3600 *
3601 * Return value:
3602 * 0 on success / non-zero on failure
3603 **/
3604static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
3605{
3606 struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
3607 struct device *dev = vhost->dev;
3608
3609 ENTER;
3610 async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
3611 if (!async_q->msgs) {
3612 dev_err(dev, "Couldn't allocate async queue.\n");
3613 goto nomem;
3614 }
3615
3616 async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
3617 async_q->msg_token = dma_map_single(dev, async_q->msgs,
3618 async_q->size * sizeof(*async_q->msgs),
3619 DMA_BIDIRECTIONAL);
3620
8d8bb39b 3621 if (dma_mapping_error(dev, async_q->msg_token)) {
072b91f9
BK		 3622 dev_err(dev, "Failed to map async queue\n");
3623 goto free_async_crq;
3624 }
3625
3626 vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
3627 SG_ALL * sizeof(struct srp_direct_buf),
3628 sizeof(struct srp_direct_buf), 0);
3629
3630 if (!vhost->sg_pool) {
3631 dev_err(dev, "Failed to allocate sg pool\n");
3632 goto unmap_async_crq;
3633 }
3634
3635 vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
3636 &vhost->login_buf_dma, GFP_KERNEL);
3637
3638 if (!vhost->login_buf) {
3639 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
3640 goto free_sg_pool;
3641 }
3642
3643 vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
3644 vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
3645 &vhost->disc_buf_dma, GFP_KERNEL);
3646
3647 if (!vhost->disc_buf) {
3648 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
3649 goto free_login_buffer;
3650 }
3651
3652 vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
3653 sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
3654
3655 if (!vhost->trace)
3656 goto free_disc_buffer;
3657
3658 vhost->tgt_pool = mempool_create_kzalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
3659 sizeof(struct ibmvfc_target));
3660
3661 if (!vhost->tgt_pool) {
3662 dev_err(dev, "Couldn't allocate target memory pool\n");
3663 goto free_trace;
3664 }
3665
3666 LEAVE;
3667 return 0;
3668
3669free_trace:
3670 kfree(vhost->trace);
3671free_disc_buffer:
3672 dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
3673 vhost->disc_buf_dma);
3674free_login_buffer:
3675 dma_free_coherent(dev, sizeof(*vhost->login_buf),
3676 vhost->login_buf, vhost->login_buf_dma);
3677free_sg_pool:
3678 dma_pool_destroy(vhost->sg_pool);
3679unmap_async_crq:
3680 dma_unmap_single(dev, async_q->msg_token,
3681 async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
3682free_async_crq:
3683 free_page((unsigned long)async_q->msgs);
3684nomem:
3685 LEAVE;
3686 return -ENOMEM;
3687}
3688
3689/**
3690 * ibmvfc_probe - Adapter hot plug add entry point
3691 * @vdev: vio device struct
3692 * @id: vio device id struct
3693 *
3694 * Return value:
3695 * 0 on success / non-zero on failure
3696 **/
3697static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
3698{
3699 struct ibmvfc_host *vhost;
3700 struct Scsi_Host *shost;
3701 struct device *dev = &vdev->dev;
3702 int rc = -ENOMEM;
3703
3704 ENTER;
3705 shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
3706 if (!shost) {
3707 dev_err(dev, "Couldn't allocate host data\n");
3708 goto out;
3709 }
3710
3711 shost->transportt = ibmvfc_transport_template;
3712 shost->can_queue = max_requests;
3713 shost->max_lun = max_lun;
3714 shost->max_id = max_targets;
3715 shost->max_sectors = IBMVFC_MAX_SECTORS;
3716 shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
3717 shost->unique_id = shost->host_no;
3718
3719 vhost = shost_priv(shost);
3720 INIT_LIST_HEAD(&vhost->sent);
3721 INIT_LIST_HEAD(&vhost->free);
3722 INIT_LIST_HEAD(&vhost->targets);
3723 sprintf(vhost->name, IBMVFC_NAME);
3724 vhost->host = shost;
3725 vhost->dev = dev;
3726 vhost->partition_number = -1;
3727 vhost->log_level = log_level;
3728 strcpy(vhost->partition_name, "UNKNOWN");
3729 init_waitqueue_head(&vhost->work_wait_q);
3730 init_waitqueue_head(&vhost->init_wait_q);
3731
3732 if ((rc = ibmvfc_alloc_mem(vhost)))
3733 goto free_scsi_host;
3734
3735 vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
3736 shost->host_no);
3737
3738 if (IS_ERR(vhost->work_thread)) {
3739 dev_err(dev, "Couldn't create kernel thread: %ld\n",
3740 PTR_ERR(vhost->work_thread));
3741 goto free_host_mem;
3742 }
3743
3744 if ((rc = ibmvfc_init_crq(vhost))) {
3745 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
3746 goto kill_kthread;
3747 }
3748
3749 if ((rc = ibmvfc_init_event_pool(vhost))) {
3750 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
3751 goto release_crq;
3752 }
3753
3754 if ((rc = scsi_add_host(shost, dev)))
3755 goto release_event_pool;
3756
3757 if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
3758 &ibmvfc_trace_attr))) {
3759 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
3760 goto remove_shost;
3761 }
3762
3763 dev_set_drvdata(dev, vhost);
3764 spin_lock(&ibmvfc_driver_lock);
3765 list_add_tail(&vhost->queue, &ibmvfc_head);
3766 spin_unlock(&ibmvfc_driver_lock);
3767
3768 ibmvfc_send_crq_init(vhost);
3769 scsi_scan_host(shost);
3770 return 0;
3771
3772remove_shost:
3773 scsi_remove_host(shost);
3774release_event_pool:
3775 ibmvfc_free_event_pool(vhost);
3776release_crq:
3777 ibmvfc_release_crq_queue(vhost);
3778kill_kthread:
3779 kthread_stop(vhost->work_thread);
3780free_host_mem:
3781 ibmvfc_free_mem(vhost);
3782free_scsi_host:
3783 scsi_host_put(shost);
3784out:
3785 LEAVE;
3786 return rc;
3787}
3788
3789/**
3790 * ibmvfc_remove - Adapter hot plug remove entry point
3791 * @vdev: vio device struct
3792 *
3793 * Return value:
3794 * 0
3795 **/
3796static int ibmvfc_remove(struct vio_dev *vdev)
3797{
3798 struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
3799 unsigned long flags;
3800
3801 ENTER;
3802 ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
3803 kthread_stop(vhost->work_thread);
3804 fc_remove_host(vhost->host);
3805 scsi_remove_host(vhost->host);
3806 ibmvfc_release_crq_queue(vhost);
3807
3808 spin_lock_irqsave(vhost->host->host_lock, flags);
3809 ibmvfc_purge_requests(vhost, DID_ERROR);
3810 ibmvfc_free_event_pool(vhost);
3811 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3812
3813 ibmvfc_free_mem(vhost);
3814 spin_lock(&ibmvfc_driver_lock);
3815 list_del(&vhost->queue);
3816 spin_unlock(&ibmvfc_driver_lock);
3817 scsi_host_put(vhost->host);
3818 LEAVE;
3819 return 0;
3820}
3821
39c1ffec
BK		 3822/**
3823 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
3824 * @vdev: vio device struct
3825 *
3826 * Return value:
3827 * Number of bytes the driver will need to DMA map at the same time in
3828 * order to perform well.
3829 */
3830static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
3831{
3832 unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
3833 return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
3834}
3835
072b91f9
BK		 3836static struct vio_device_id ibmvfc_device_table[] __devinitdata = {
3837 {"fcp", "IBM,vfc-client"},
3838 { "", "" }
3839};
3840MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
3841
3842static struct vio_driver ibmvfc_driver = {
3843 .id_table = ibmvfc_device_table,
3844 .probe = ibmvfc_probe,
3845 .remove = ibmvfc_remove,
39c1ffec 3846 .get_desired_dma = ibmvfc_get_desired_dma,
072b91f9
BK		 3847 .driver = {
3848 .name = IBMVFC_NAME,
3849 .owner = THIS_MODULE,
3850 }
3851};
3852
3853static struct fc_function_template ibmvfc_transport_functions = {
3854 .show_host_fabric_name = 1,
3855 .show_host_node_name = 1,
3856 .show_host_port_name = 1,
3857 .show_host_supported_classes = 1,
3858 .show_host_port_type = 1,
3859 .show_host_port_id = 1,
3860
3861 .get_host_port_state = ibmvfc_get_host_port_state,
3862 .show_host_port_state = 1,
3863
3864 .get_host_speed = ibmvfc_get_host_speed,
3865 .show_host_speed = 1,
3866
3867 .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
3868 .terminate_rport_io = ibmvfc_terminate_rport_io,
3869
3870 .show_rport_maxframe_size = 1,
3871 .show_rport_supported_classes = 1,
3872
3873 .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
3874 .show_rport_dev_loss_tmo = 1,
3875
3876 .get_starget_node_name = ibmvfc_get_starget_node_name,
3877 .show_starget_node_name = 1,
3878
3879 .get_starget_port_name = ibmvfc_get_starget_port_name,
3880 .show_starget_port_name = 1,
3881
3882 .get_starget_port_id = ibmvfc_get_starget_port_id,
3883 .show_starget_port_id = 1,
3884};
3885
3886/**
3887 * ibmvfc_module_init - Initialize the ibmvfc module
3888 *
3889 * Return value:
3890 * 0 on success / other on failure
3891 **/
3892static int __init ibmvfc_module_init(void)
3893{
3894 int rc;
3895
3896 if (!firmware_has_feature(FW_FEATURE_VIO))
3897 return -ENODEV;
3898
3899 printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
3900 IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
3901
3902 ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
3903 if (!ibmvfc_transport_template)
3904 return -ENOMEM;
3905
3906 rc = vio_register_driver(&ibmvfc_driver);
3907 if (rc)
3908 fc_release_transport(ibmvfc_transport_template);
3909 return rc;
3910}
3911
3912/**
3913 * ibmvfc_module_exit - Teardown the ibmvfc module
3914 *
3915 * Return value:
3916 * nothing
3917 **/
3918static void __exit ibmvfc_module_exit(void)
3919{
3920 vio_unregister_driver(&ibmvfc_driver);
3921 fc_release_transport(ibmvfc_transport_template);
3922}
3923
3924module_init(ibmvfc_module_init);
3925module_exit(ibmvfc_module_exit);
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