Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/scsi/ibmvscsi/ibmvfc.c

  1 /*
  2  * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
  3  *
  4  * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
  5  *
  6  * Copyright (C) IBM Corporation, 2008
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  *
 22  */
 23 
 24 #include <linux/module.h>
 25 #include <linux/moduleparam.h>
 26 #include <linux/dma-mapping.h>
 27 #include <linux/dmapool.h>
 28 #include <linux/delay.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/kthread.h>
 31 #include <linux/slab.h>
 32 #include <linux/of.h>
 33 #include <linux/pm.h>
 34 #include <linux/stringify.h>
 35 #include <asm/firmware.h>
 36 #include <asm/irq.h>
 37 #include <asm/vio.h>
 38 #include <scsi/scsi.h>
 39 #include <scsi/scsi_cmnd.h>
 40 #include <scsi/scsi_host.h>
 41 #include <scsi/scsi_device.h>
 42 #include <scsi/scsi_tcq.h>
 43 #include <scsi/scsi_transport_fc.h>
 44 #include <scsi/scsi_bsg_fc.h>
 45 #include "ibmvfc.h"
 46 
 47 static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
 48 static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
 49 static u64 max_lun = IBMVFC_MAX_LUN;
 50 static unsigned int max_targets = IBMVFC_MAX_TARGETS;
 51 static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
 52 static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
 53 static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
 54 static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
 55 static LIST_HEAD(ibmvfc_head);
 56 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
 57 static struct scsi_transport_template *ibmvfc_transport_template;
 58 
 59 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
 60 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
 61 MODULE_LICENSE("GPL");
 62 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
 63 
 64 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
 65 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
 66                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
 67 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
 68 MODULE_PARM_DESC(default_timeout,
 69                  "Default timeout in seconds for initialization and EH commands. "
 70                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
 71 module_param_named(max_requests, max_requests, uint, S_IRUGO);
 72 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
 73                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
 74 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
 75 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
 76                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
 77 module_param_named(max_targets, max_targets, uint, S_IRUGO);
 78 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
 79                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
 80 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
 81 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
 82                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
 83 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
 84 MODULE_PARM_DESC(debug, "Enable driver debug information. "
 85                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
 86 module_param_named(log_level, log_level, uint, 0);
 87 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
 88                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
 89 
 90 static const struct {
 91         u16 status;
 92         u16 error;
 93         u8 result;
 94         u8 retry;
 95         int log;
 96         char *name;
 97 } cmd_status [] = {
 98         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 99         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
100         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
101         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
102         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
103         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
104         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
105         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
106         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
107         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
108         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
109         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
110         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
111         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
112 
113         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
114         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
115         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
116         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
117         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
118         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
119         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
120         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
121         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
122         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
123 
124         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
125         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
126         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
127         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
128         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
129         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
130         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
131         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
132         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
133         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
134         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
135 
136         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
137 };
138 
139 static void ibmvfc_npiv_login(struct ibmvfc_host *);
140 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
141 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
142 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
143 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
144 
145 static const char *unknown_error = "unknown error";
146 
147 #ifdef CONFIG_SCSI_IBMVFC_TRACE
148 /**
149  * ibmvfc_trc_start - Log a start trace entry
150  * @evt:                ibmvfc event struct
151  *
152  **/
153 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
154 {
155         struct ibmvfc_host *vhost = evt->vhost;
156         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
157         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
158         struct ibmvfc_trace_entry *entry;
159 
160         entry = &vhost->trace[vhost->trace_index++];
161         entry->evt = evt;
162         entry->time = jiffies;
163         entry->fmt = evt->crq.format;
164         entry->type = IBMVFC_TRC_START;
165 
166         switch (entry->fmt) {
167         case IBMVFC_CMD_FORMAT:
168                 entry->op_code = vfc_cmd->iu.cdb[0];
169                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
170                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
171                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
172                 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
173                 break;
174         case IBMVFC_MAD_FORMAT:
175                 entry->op_code = be32_to_cpu(mad->opcode);
176                 break;
177         default:
178                 break;
179         };
180 }
181 
182 /**
183  * ibmvfc_trc_end - Log an end trace entry
184  * @evt:                ibmvfc event struct
185  *
186  **/
187 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
188 {
189         struct ibmvfc_host *vhost = evt->vhost;
190         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
191         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
192         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
193 
194         entry->evt = evt;
195         entry->time = jiffies;
196         entry->fmt = evt->crq.format;
197         entry->type = IBMVFC_TRC_END;
198 
199         switch (entry->fmt) {
200         case IBMVFC_CMD_FORMAT:
201                 entry->op_code = vfc_cmd->iu.cdb[0];
202                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
203                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
204                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
205                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
206                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
207                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
208                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
209                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
210                 break;
211         case IBMVFC_MAD_FORMAT:
212                 entry->op_code = be32_to_cpu(mad->opcode);
213                 entry->u.end.status = be16_to_cpu(mad->status);
214                 break;
215         default:
216                 break;
217 
218         };
219 }
220 
221 #else
222 #define ibmvfc_trc_start(evt) do { } while (0)
223 #define ibmvfc_trc_end(evt) do { } while (0)
224 #endif
225 
226 /**
227  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
228  * @status:             status / error class
229  * @error:              error
230  *
231  * Return value:
232  *      index into cmd_status / -EINVAL on failure
233  **/
234 static int ibmvfc_get_err_index(u16 status, u16 error)
235 {
236         int i;
237 
238         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
239                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
240                     cmd_status[i].error == error)
241                         return i;
242 
243         return -EINVAL;
244 }
245 
246 /**
247  * ibmvfc_get_cmd_error - Find the error description for the fcp response
248  * @status:             status / error class
249  * @error:              error
250  *
251  * Return value:
252  *      error description string
253  **/
254 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
255 {
256         int rc = ibmvfc_get_err_index(status, error);
257         if (rc >= 0)
258                 return cmd_status[rc].name;
259         return unknown_error;
260 }
261 
262 /**
263  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
264  * @vfc_cmd:    ibmvfc command struct
265  *
266  * Return value:
267  *      SCSI result value to return for completed command
268  **/
269 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
270 {
271         int err;
272         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
273         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
274 
275         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
276             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
277              rsp->data.info.rsp_code))
278                 return DID_ERROR << 16;
279 
280         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
281         if (err >= 0)
282                 return rsp->scsi_status | (cmd_status[err].result << 16);
283         return rsp->scsi_status | (DID_ERROR << 16);
284 }
285 
286 /**
287  * ibmvfc_retry_cmd - Determine if error status is retryable
288  * @status:             status / error class
289  * @error:              error
290  *
291  * Return value:
292  *      1 if error should be retried / 0 if it should not
293  **/
294 static int ibmvfc_retry_cmd(u16 status, u16 error)
295 {
296         int rc = ibmvfc_get_err_index(status, error);
297 
298         if (rc >= 0)
299                 return cmd_status[rc].retry;
300         return 1;
301 }
302 
303 static const char *unknown_fc_explain = "unknown fc explain";
304 
305 static const struct {
306         u16 fc_explain;
307         char *name;
308 } ls_explain [] = {
309         { 0x00, "no additional explanation" },
310         { 0x01, "service parameter error - options" },
311         { 0x03, "service parameter error - initiator control" },
312         { 0x05, "service parameter error - recipient control" },
313         { 0x07, "service parameter error - received data field size" },
314         { 0x09, "service parameter error - concurrent seq" },
315         { 0x0B, "service parameter error - credit" },
316         { 0x0D, "invalid N_Port/F_Port_Name" },
317         { 0x0E, "invalid node/Fabric Name" },
318         { 0x0F, "invalid common service parameters" },
319         { 0x11, "invalid association header" },
320         { 0x13, "association header required" },
321         { 0x15, "invalid originator S_ID" },
322         { 0x17, "invalid OX_ID-RX-ID combination" },
323         { 0x19, "command (request) already in progress" },
324         { 0x1E, "N_Port Login requested" },
325         { 0x1F, "Invalid N_Port_ID" },
326 };
327 
328 static const struct {
329         u16 fc_explain;
330         char *name;
331 } gs_explain [] = {
332         { 0x00, "no additional explanation" },
333         { 0x01, "port identifier not registered" },
334         { 0x02, "port name not registered" },
335         { 0x03, "node name not registered" },
336         { 0x04, "class of service not registered" },
337         { 0x06, "initial process associator not registered" },
338         { 0x07, "FC-4 TYPEs not registered" },
339         { 0x08, "symbolic port name not registered" },
340         { 0x09, "symbolic node name not registered" },
341         { 0x0A, "port type not registered" },
342         { 0xF0, "authorization exception" },
343         { 0xF1, "authentication exception" },
344         { 0xF2, "data base full" },
345         { 0xF3, "data base empty" },
346         { 0xF4, "processing request" },
347         { 0xF5, "unable to verify connection" },
348         { 0xF6, "devices not in a common zone" },
349 };
350 
351 /**
352  * ibmvfc_get_ls_explain - Return the FC Explain description text
353  * @status:     FC Explain status
354  *
355  * Returns:
356  *      error string
357  **/
358 static const char *ibmvfc_get_ls_explain(u16 status)
359 {
360         int i;
361 
362         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
363                 if (ls_explain[i].fc_explain == status)
364                         return ls_explain[i].name;
365 
366         return unknown_fc_explain;
367 }
368 
369 /**
370  * ibmvfc_get_gs_explain - Return the FC Explain description text
371  * @status:     FC Explain status
372  *
373  * Returns:
374  *      error string
375  **/
376 static const char *ibmvfc_get_gs_explain(u16 status)
377 {
378         int i;
379 
380         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
381                 if (gs_explain[i].fc_explain == status)
382                         return gs_explain[i].name;
383 
384         return unknown_fc_explain;
385 }
386 
387 static const struct {
388         enum ibmvfc_fc_type fc_type;
389         char *name;
390 } fc_type [] = {
391         { IBMVFC_FABRIC_REJECT, "fabric reject" },
392         { IBMVFC_PORT_REJECT, "port reject" },
393         { IBMVFC_LS_REJECT, "ELS reject" },
394         { IBMVFC_FABRIC_BUSY, "fabric busy" },
395         { IBMVFC_PORT_BUSY, "port busy" },
396         { IBMVFC_BASIC_REJECT, "basic reject" },
397 };
398 
399 static const char *unknown_fc_type = "unknown fc type";
400 
401 /**
402  * ibmvfc_get_fc_type - Return the FC Type description text
403  * @status:     FC Type error status
404  *
405  * Returns:
406  *      error string
407  **/
408 static const char *ibmvfc_get_fc_type(u16 status)
409 {
410         int i;
411 
412         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
413                 if (fc_type[i].fc_type == status)
414                         return fc_type[i].name;
415 
416         return unknown_fc_type;
417 }
418 
419 /**
420  * ibmvfc_set_tgt_action - Set the next init action for the target
421  * @tgt:                ibmvfc target struct
422  * @action:             action to perform
423  *
424  **/
425 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
426                                   enum ibmvfc_target_action action)
427 {
428         switch (tgt->action) {
429         case IBMVFC_TGT_ACTION_DEL_RPORT:
430                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
431                         tgt->action = action;
432         case IBMVFC_TGT_ACTION_DELETED_RPORT:
433                 break;
434         default:
435                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
436                         tgt->add_rport = 0;
437                 tgt->action = action;
438                 break;
439         }
440 }
441 
442 /**
443  * ibmvfc_set_host_state - Set the state for the host
444  * @vhost:              ibmvfc host struct
445  * @state:              state to set host to
446  *
447  * Returns:
448  *      0 if state changed / non-zero if not changed
449  **/
450 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
451                                   enum ibmvfc_host_state state)
452 {
453         int rc = 0;
454 
455         switch (vhost->state) {
456         case IBMVFC_HOST_OFFLINE:
457                 rc = -EINVAL;
458                 break;
459         default:
460                 vhost->state = state;
461                 break;
462         };
463 
464         return rc;
465 }
466 
467 /**
468  * ibmvfc_set_host_action - Set the next init action for the host
469  * @vhost:              ibmvfc host struct
470  * @action:             action to perform
471  *
472  **/
473 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
474                                    enum ibmvfc_host_action action)
475 {
476         switch (action) {
477         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
478                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
479                         vhost->action = action;
480                 break;
481         case IBMVFC_HOST_ACTION_LOGO_WAIT:
482                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
483                         vhost->action = action;
484                 break;
485         case IBMVFC_HOST_ACTION_INIT_WAIT:
486                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
487                         vhost->action = action;
488                 break;
489         case IBMVFC_HOST_ACTION_QUERY:
490                 switch (vhost->action) {
491                 case IBMVFC_HOST_ACTION_INIT_WAIT:
492                 case IBMVFC_HOST_ACTION_NONE:
493                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
494                         vhost->action = action;
495                         break;
496                 default:
497                         break;
498                 };
499                 break;
500         case IBMVFC_HOST_ACTION_TGT_INIT:
501                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
502                         vhost->action = action;
503                 break;
504         case IBMVFC_HOST_ACTION_INIT:
505         case IBMVFC_HOST_ACTION_TGT_DEL:
506                 switch (vhost->action) {
507                 case IBMVFC_HOST_ACTION_RESET:
508                 case IBMVFC_HOST_ACTION_REENABLE:
509                         break;
510                 default:
511                         vhost->action = action;
512                         break;
513                 };
514                 break;
515         case IBMVFC_HOST_ACTION_LOGO:
516         case IBMVFC_HOST_ACTION_QUERY_TGTS:
517         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
518         case IBMVFC_HOST_ACTION_NONE:
519         case IBMVFC_HOST_ACTION_RESET:
520         case IBMVFC_HOST_ACTION_REENABLE:
521         default:
522                 vhost->action = action;
523                 break;
524         };
525 }
526 
527 /**
528  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
529  * @vhost:              ibmvfc host struct
530  *
531  * Return value:
532  *      nothing
533  **/
534 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
535 {
536         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
537                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
538                         scsi_block_requests(vhost->host);
539                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
540                 }
541         } else
542                 vhost->reinit = 1;
543 
544         wake_up(&vhost->work_wait_q);
545 }
546 
547 /**
548  * ibmvfc_link_down - Handle a link down event from the adapter
549  * @vhost:      ibmvfc host struct
550  * @state:      ibmvfc host state to enter
551  *
552  **/
553 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
554                              enum ibmvfc_host_state state)
555 {
556         struct ibmvfc_target *tgt;
557 
558         ENTER;
559         scsi_block_requests(vhost->host);
560         list_for_each_entry(tgt, &vhost->targets, queue)
561                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
562         ibmvfc_set_host_state(vhost, state);
563         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
564         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
565         wake_up(&vhost->work_wait_q);
566         LEAVE;
567 }
568 
569 /**
570  * ibmvfc_init_host - Start host initialization
571  * @vhost:              ibmvfc host struct
572  *
573  * Return value:
574  *      nothing
575  **/
576 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
577 {
578         struct ibmvfc_target *tgt;
579 
580         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
581                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
582                         dev_err(vhost->dev,
583                                 "Host initialization retries exceeded. Taking adapter offline\n");
584                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
585                         return;
586                 }
587         }
588 
589         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
590                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
591                 vhost->async_crq.cur = 0;
592 
593                 list_for_each_entry(tgt, &vhost->targets, queue)
594                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
595                 scsi_block_requests(vhost->host);
596                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
597                 vhost->job_step = ibmvfc_npiv_login;
598                 wake_up(&vhost->work_wait_q);
599         }
600 }
601 
602 /**
603  * ibmvfc_send_crq - Send a CRQ
604  * @vhost:      ibmvfc host struct
605  * @word1:      the first 64 bits of the data
606  * @word2:      the second 64 bits of the data
607  *
608  * Return value:
609  *      0 on success / other on failure
610  **/
611 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
612 {
613         struct vio_dev *vdev = to_vio_dev(vhost->dev);
614         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
615 }
616 
617 /**
618  * ibmvfc_send_crq_init - Send a CRQ init message
619  * @vhost:      ibmvfc host struct
620  *
621  * Return value:
622  *      0 on success / other on failure
623  **/
624 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
625 {
626         ibmvfc_dbg(vhost, "Sending CRQ init\n");
627         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
628 }
629 
630 /**
631  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
632  * @vhost:      ibmvfc host struct
633  *
634  * Return value:
635  *      0 on success / other on failure
636  **/
637 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
638 {
639         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
640         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
641 }
642 
643 /**
644  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
645  * @vhost:      ibmvfc host struct
646  *
647  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
648  * the crq with the hypervisor.
649  **/
650 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
651 {
652         long rc = 0;
653         struct vio_dev *vdev = to_vio_dev(vhost->dev);
654         struct ibmvfc_crq_queue *crq = &vhost->crq;
655 
656         ibmvfc_dbg(vhost, "Releasing CRQ\n");
657         free_irq(vdev->irq, vhost);
658         tasklet_kill(&vhost->tasklet);
659         do {
660                 if (rc)
661                         msleep(100);
662                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
663         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
664 
665         vhost->state = IBMVFC_NO_CRQ;
666         vhost->logged_in = 0;
667         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
668         free_page((unsigned long)crq->msgs);
669 }
670 
671 /**
672  * ibmvfc_reenable_crq_queue - reenables the CRQ
673  * @vhost:      ibmvfc host struct
674  *
675  * Return value:
676  *      0 on success / other on failure
677  **/
678 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
679 {
680         int rc = 0;
681         struct vio_dev *vdev = to_vio_dev(vhost->dev);
682 
683         /* Re-enable the CRQ */
684         do {
685                 if (rc)
686                         msleep(100);
687                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
688         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
689 
690         if (rc)
691                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
692 
693         return rc;
694 }
695 
696 /**
697  * ibmvfc_reset_crq - resets a crq after a failure
698  * @vhost:      ibmvfc host struct
699  *
700  * Return value:
701  *      0 on success / other on failure
702  **/
703 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
704 {
705         int rc = 0;
706         unsigned long flags;
707         struct vio_dev *vdev = to_vio_dev(vhost->dev);
708         struct ibmvfc_crq_queue *crq = &vhost->crq;
709 
710         /* Close the CRQ */
711         do {
712                 if (rc)
713                         msleep(100);
714                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
715         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
716 
717         spin_lock_irqsave(vhost->host->host_lock, flags);
718         vhost->state = IBMVFC_NO_CRQ;
719         vhost->logged_in = 0;
720         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
721 
722         /* Clean out the queue */
723         memset(crq->msgs, 0, PAGE_SIZE);
724         crq->cur = 0;
725 
726         /* And re-open it again */
727         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
728                                 crq->msg_token, PAGE_SIZE);
729 
730         if (rc == H_CLOSED)
731                 /* Adapter is good, but other end is not ready */
732                 dev_warn(vhost->dev, "Partner adapter not ready\n");
733         else if (rc != 0)
734                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
735         spin_unlock_irqrestore(vhost->host->host_lock, flags);
736 
737         return rc;
738 }
739 
740 /**
741  * ibmvfc_valid_event - Determines if event is valid.
742  * @pool:       event_pool that contains the event
743  * @evt:        ibmvfc event to be checked for validity
744  *
745  * Return value:
746  *      1 if event is valid / 0 if event is not valid
747  **/
748 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
749                               struct ibmvfc_event *evt)
750 {
751         int index = evt - pool->events;
752         if (index < 0 || index >= pool->size)   /* outside of bounds */
753                 return 0;
754         if (evt != pool->events + index)        /* unaligned */
755                 return 0;
756         return 1;
757 }
758 
759 /**
760  * ibmvfc_free_event - Free the specified event
761  * @evt:        ibmvfc_event to be freed
762  *
763  **/
764 static void ibmvfc_free_event(struct ibmvfc_event *evt)
765 {
766         struct ibmvfc_host *vhost = evt->vhost;
767         struct ibmvfc_event_pool *pool = &vhost->pool;
768 
769         BUG_ON(!ibmvfc_valid_event(pool, evt));
770         BUG_ON(atomic_inc_return(&evt->free) != 1);
771         list_add_tail(&evt->queue, &vhost->free);
772 }
773 
774 /**
775  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
776  * @evt:        ibmvfc event struct
777  *
778  * This function does not setup any error status, that must be done
779  * before this function gets called.
780  **/
781 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
782 {
783         struct scsi_cmnd *cmnd = evt->cmnd;
784 
785         if (cmnd) {
786                 scsi_dma_unmap(cmnd);
787                 cmnd->scsi_done(cmnd);
788         }
789 
790         if (evt->eh_comp)
791                 complete(evt->eh_comp);
792 
793         ibmvfc_free_event(evt);
794 }
795 
796 /**
797  * ibmvfc_fail_request - Fail request with specified error code
798  * @evt:                ibmvfc event struct
799  * @error_code: error code to fail request with
800  *
801  * Return value:
802  *      none
803  **/
804 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
805 {
806         if (evt->cmnd) {
807                 evt->cmnd->result = (error_code << 16);
808                 evt->done = ibmvfc_scsi_eh_done;
809         } else
810                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
811 
812         list_del(&evt->queue);
813         del_timer(&evt->timer);
814         ibmvfc_trc_end(evt);
815         evt->done(evt);
816 }
817 
818 /**
819  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
820  * @vhost:              ibmvfc host struct
821  * @error_code: error code to fail requests with
822  *
823  * Return value:
824  *      none
825  **/
826 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
827 {
828         struct ibmvfc_event *evt, *pos;
829 
830         ibmvfc_dbg(vhost, "Purging all requests\n");
831         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
832                 ibmvfc_fail_request(evt, error_code);
833 }
834 
835 /**
836  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
837  * @vhost:      struct ibmvfc host to reset
838  **/
839 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
840 {
841         ibmvfc_purge_requests(vhost, DID_ERROR);
842         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
843         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
844 }
845 
846 /**
847  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
848  * @vhost:      struct ibmvfc host to reset
849  **/
850 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
851 {
852         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
853             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
854                 scsi_block_requests(vhost->host);
855                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
856                 vhost->job_step = ibmvfc_npiv_logout;
857                 wake_up(&vhost->work_wait_q);
858         } else
859                 ibmvfc_hard_reset_host(vhost);
860 }
861 
862 /**
863  * ibmvfc_reset_host - Reset the connection to the server
864  * @vhost:      ibmvfc host struct
865  **/
866 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
867 {
868         unsigned long flags;
869 
870         spin_lock_irqsave(vhost->host->host_lock, flags);
871         __ibmvfc_reset_host(vhost);
872         spin_unlock_irqrestore(vhost->host->host_lock, flags);
873 }
874 
875 /**
876  * ibmvfc_retry_host_init - Retry host initialization if allowed
877  * @vhost:      ibmvfc host struct
878  *
879  * Returns: 1 if init will be retried / 0 if not
880  *
881  **/
882 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
883 {
884         int retry = 0;
885 
886         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
887                 vhost->delay_init = 1;
888                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
889                         dev_err(vhost->dev,
890                                 "Host initialization retries exceeded. Taking adapter offline\n");
891                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
892                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
893                         __ibmvfc_reset_host(vhost);
894                 else {
895                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
896                         retry = 1;
897                 }
898         }
899 
900         wake_up(&vhost->work_wait_q);
901         return retry;
902 }
903 
904 /**
905  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
906  * @starget:    scsi target struct
907  *
908  * Return value:
909  *      ibmvfc_target struct / NULL if not found
910  **/
911 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
912 {
913         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
914         struct ibmvfc_host *vhost = shost_priv(shost);
915         struct ibmvfc_target *tgt;
916 
917         list_for_each_entry(tgt, &vhost->targets, queue)
918                 if (tgt->target_id == starget->id) {
919                         kref_get(&tgt->kref);
920                         return tgt;
921                 }
922         return NULL;
923 }
924 
925 /**
926  * ibmvfc_get_target - Find the specified scsi_target
927  * @starget:    scsi target struct
928  *
929  * Return value:
930  *      ibmvfc_target struct / NULL if not found
931  **/
932 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
933 {
934         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
935         struct ibmvfc_target *tgt;
936         unsigned long flags;
937 
938         spin_lock_irqsave(shost->host_lock, flags);
939         tgt = __ibmvfc_get_target(starget);
940         spin_unlock_irqrestore(shost->host_lock, flags);
941         return tgt;
942 }
943 
944 /**
945  * ibmvfc_get_host_speed - Get host port speed
946  * @shost:              scsi host struct
947  *
948  * Return value:
949  *      none
950  **/
951 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
952 {
953         struct ibmvfc_host *vhost = shost_priv(shost);
954         unsigned long flags;
955 
956         spin_lock_irqsave(shost->host_lock, flags);
957         if (vhost->state == IBMVFC_ACTIVE) {
958                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
959                 case 1:
960                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
961                         break;
962                 case 2:
963                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
964                         break;
965                 case 4:
966                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
967                         break;
968                 case 8:
969                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
970                         break;
971                 case 10:
972                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
973                         break;
974                 case 16:
975                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
976                         break;
977                 default:
978                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
979                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
980                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
981                         break;
982                 }
983         } else
984                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
985         spin_unlock_irqrestore(shost->host_lock, flags);
986 }
987 
988 /**
989  * ibmvfc_get_host_port_state - Get host port state
990  * @shost:              scsi host struct
991  *
992  * Return value:
993  *      none
994  **/
995 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
996 {
997         struct ibmvfc_host *vhost = shost_priv(shost);
998         unsigned long flags;
999 
1000         spin_lock_irqsave(shost->host_lock, flags);
1001         switch (vhost->state) {
1002         case IBMVFC_INITIALIZING:
1003         case IBMVFC_ACTIVE:
1004                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1005                 break;
1006         case IBMVFC_LINK_DOWN:
1007                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1008                 break;
1009         case IBMVFC_LINK_DEAD:
1010         case IBMVFC_HOST_OFFLINE:
1011                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1012                 break;
1013         case IBMVFC_HALTED:
1014                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1015                 break;
1016         case IBMVFC_NO_CRQ:
1017                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1018                 break;
1019         default:
1020                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1021                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022                 break;
1023         }
1024         spin_unlock_irqrestore(shost->host_lock, flags);
1025 }
1026 
1027 /**
1028  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1029  * @rport:              rport struct
1030  * @timeout:    timeout value
1031  *
1032  * Return value:
1033  *      none
1034  **/
1035 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1036 {
1037         if (timeout)
1038                 rport->dev_loss_tmo = timeout;
1039         else
1040                 rport->dev_loss_tmo = 1;
1041 }
1042 
1043 /**
1044  * ibmvfc_release_tgt - Free memory allocated for a target
1045  * @kref:               kref struct
1046  *
1047  **/
1048 static void ibmvfc_release_tgt(struct kref *kref)
1049 {
1050         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1051         kfree(tgt);
1052 }
1053 
1054 /**
1055  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1056  * @starget:    scsi target struct
1057  *
1058  * Return value:
1059  *      none
1060  **/
1061 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1062 {
1063         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1064         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1065         if (tgt)
1066                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1067 }
1068 
1069 /**
1070  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1071  * @starget:    scsi target struct
1072  *
1073  * Return value:
1074  *      none
1075  **/
1076 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1077 {
1078         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1079         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1080         if (tgt)
1081                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1082 }
1083 
1084 /**
1085  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1086  * @starget:    scsi target struct
1087  *
1088  * Return value:
1089  *      none
1090  **/
1091 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1092 {
1093         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1094         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1095         if (tgt)
1096                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1097 }
1098 
1099 /**
1100  * ibmvfc_wait_while_resetting - Wait while the host resets
1101  * @vhost:              ibmvfc host struct
1102  *
1103  * Return value:
1104  *      0 on success / other on failure
1105  **/
1106 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1107 {
1108         long timeout = wait_event_timeout(vhost->init_wait_q,
1109                                           ((vhost->state == IBMVFC_ACTIVE ||
1110                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1111                                             vhost->state == IBMVFC_LINK_DEAD) &&
1112                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1113                                           (init_timeout * HZ));
1114 
1115         return timeout ? 0 : -EIO;
1116 }
1117 
1118 /**
1119  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1120  * @shost:              scsi host struct
1121  *
1122  * Return value:
1123  *      0 on success / other on failure
1124  **/
1125 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1126 {
1127         struct ibmvfc_host *vhost = shost_priv(shost);
1128 
1129         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1130         ibmvfc_reset_host(vhost);
1131         return ibmvfc_wait_while_resetting(vhost);
1132 }
1133 
1134 /**
1135  * ibmvfc_gather_partition_info - Gather info about the LPAR
1136  *
1137  * Return value:
1138  *      none
1139  **/
1140 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1141 {
1142         struct device_node *rootdn;
1143         const char *name;
1144         const unsigned int *num;
1145 
1146         rootdn = of_find_node_by_path("/");
1147         if (!rootdn)
1148                 return;
1149 
1150         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1151         if (name)
1152                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1153         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1154         if (num)
1155                 vhost->partition_number = *num;
1156         of_node_put(rootdn);
1157 }
1158 
1159 /**
1160  * ibmvfc_set_login_info - Setup info for NPIV login
1161  * @vhost:      ibmvfc host struct
1162  *
1163  * Return value:
1164  *      none
1165  **/
1166 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1167 {
1168         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1169         struct device_node *of_node = vhost->dev->of_node;
1170         const char *location;
1171 
1172         memset(login_info, 0, sizeof(*login_info));
1173 
1174         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1175         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1176         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1177         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1178         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1179         login_info->vfc_frame_version = cpu_to_be32(1);
1180         login_info->fcp_version = cpu_to_be16(3);
1181         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1182         if (vhost->client_migrated)
1183                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1184 
1185         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1186         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1187         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1188         login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1189         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1190         strncpy(login_info->device_name,
1191                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1192 
1193         location = of_get_property(of_node, "ibm,loc-code", NULL);
1194         location = location ? location : dev_name(vhost->dev);
1195         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1196 }
1197 
1198 /**
1199  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1200  * @vhost:      ibmvfc host who owns the event pool
1201  *
1202  * Returns zero on success.
1203  **/
1204 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1205 {
1206         int i;
1207         struct ibmvfc_event_pool *pool = &vhost->pool;
1208 
1209         ENTER;
1210         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1211         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1212         if (!pool->events)
1213                 return -ENOMEM;
1214 
1215         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1216                                               pool->size * sizeof(*pool->iu_storage),
1217                                               &pool->iu_token, 0);
1218 
1219         if (!pool->iu_storage) {
1220                 kfree(pool->events);
1221                 return -ENOMEM;
1222         }
1223 
1224         for (i = 0; i < pool->size; ++i) {
1225                 struct ibmvfc_event *evt = &pool->events[i];
1226                 atomic_set(&evt->free, 1);
1227                 evt->crq.valid = 0x80;
1228                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1229                 evt->xfer_iu = pool->iu_storage + i;
1230                 evt->vhost = vhost;
1231                 evt->ext_list = NULL;
1232                 list_add_tail(&evt->queue, &vhost->free);
1233         }
1234 
1235         LEAVE;
1236         return 0;
1237 }
1238 
1239 /**
1240  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1241  * @vhost:      ibmvfc host who owns the event pool
1242  *
1243  **/
1244 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1245 {
1246         int i;
1247         struct ibmvfc_event_pool *pool = &vhost->pool;
1248 
1249         ENTER;
1250         for (i = 0; i < pool->size; ++i) {
1251                 list_del(&pool->events[i].queue);
1252                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1253                 if (pool->events[i].ext_list)
1254                         dma_pool_free(vhost->sg_pool,
1255                                       pool->events[i].ext_list,
1256                                       pool->events[i].ext_list_token);
1257         }
1258 
1259         kfree(pool->events);
1260         dma_free_coherent(vhost->dev,
1261                           pool->size * sizeof(*pool->iu_storage),
1262                           pool->iu_storage, pool->iu_token);
1263         LEAVE;
1264 }
1265 
1266 /**
1267  * ibmvfc_get_event - Gets the next free event in pool
1268  * @vhost:      ibmvfc host struct
1269  *
1270  * Returns a free event from the pool.
1271  **/
1272 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1273 {
1274         struct ibmvfc_event *evt;
1275 
1276         BUG_ON(list_empty(&vhost->free));
1277         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1278         atomic_set(&evt->free, 0);
1279         list_del(&evt->queue);
1280         return evt;
1281 }
1282 
1283 /**
1284  * ibmvfc_init_event - Initialize fields in an event struct that are always
1285  *                              required.
1286  * @evt:        The event
1287  * @done:       Routine to call when the event is responded to
1288  * @format:     SRP or MAD format
1289  **/
1290 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1291                               void (*done) (struct ibmvfc_event *), u8 format)
1292 {
1293         evt->cmnd = NULL;
1294         evt->sync_iu = NULL;
1295         evt->crq.format = format;
1296         evt->done = done;
1297         evt->eh_comp = NULL;
1298 }
1299 
1300 /**
1301  * ibmvfc_map_sg_list - Initialize scatterlist
1302  * @scmd:       scsi command struct
1303  * @nseg:       number of scatterlist segments
1304  * @md: memory descriptor list to initialize
1305  **/
1306 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1307                                struct srp_direct_buf *md)
1308 {
1309         int i;
1310         struct scatterlist *sg;
1311 
1312         scsi_for_each_sg(scmd, sg, nseg, i) {
1313                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1314                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1315                 md[i].key = 0;
1316         }
1317 }
1318 
1319 /**
1320  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1321  * @scmd:               Scsi_Cmnd with the scatterlist
1322  * @evt:                ibmvfc event struct
1323  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1324  * @dev:                device for which to map dma memory
1325  *
1326  * Returns:
1327  *      0 on success / non-zero on failure
1328  **/
1329 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1330                               struct ibmvfc_event *evt,
1331                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1332 {
1333 
1334         int sg_mapped;
1335         struct srp_direct_buf *data = &vfc_cmd->ioba;
1336         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1337 
1338         sg_mapped = scsi_dma_map(scmd);
1339         if (!sg_mapped) {
1340                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1341                 return 0;
1342         } else if (unlikely(sg_mapped < 0)) {
1343                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1344                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1345                 return sg_mapped;
1346         }
1347 
1348         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1349                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1350                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1351         } else {
1352                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1353                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1354         }
1355 
1356         if (sg_mapped == 1) {
1357                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1358                 return 0;
1359         }
1360 
1361         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1362 
1363         if (!evt->ext_list) {
1364                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1365                                                &evt->ext_list_token);
1366 
1367                 if (!evt->ext_list) {
1368                         scsi_dma_unmap(scmd);
1369                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1370                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1371                         return -ENOMEM;
1372                 }
1373         }
1374 
1375         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1376 
1377         data->va = cpu_to_be64(evt->ext_list_token);
1378         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1379         data->key = 0;
1380         return 0;
1381 }
1382 
1383 /**
1384  * ibmvfc_timeout - Internal command timeout handler
1385  * @evt:        struct ibmvfc_event that timed out
1386  *
1387  * Called when an internally generated command times out
1388  **/
1389 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1390 {
1391         struct ibmvfc_host *vhost = evt->vhost;
1392         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1393         ibmvfc_reset_host(vhost);
1394 }
1395 
1396 /**
1397  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1398  * @evt:                event to be sent
1399  * @vhost:              ibmvfc host struct
1400  * @timeout:    timeout in seconds - 0 means do not time command
1401  *
1402  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1403  **/
1404 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1405                              struct ibmvfc_host *vhost, unsigned long timeout)
1406 {
1407         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1408         int rc;
1409 
1410         /* Copy the IU into the transfer area */
1411         *evt->xfer_iu = evt->iu;
1412         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1413                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1414         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1415                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1416         else
1417                 BUG();
1418 
1419         list_add_tail(&evt->queue, &vhost->sent);
1420         init_timer(&evt->timer);
1421 
1422         if (timeout) {
1423                 evt->timer.data = (unsigned long) evt;
1424                 evt->timer.expires = jiffies + (timeout * HZ);
1425                 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1426                 add_timer(&evt->timer);
1427         }
1428 
1429         mb();
1430 
1431         if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1432                                   be64_to_cpu(crq_as_u64[1])))) {
1433                 list_del(&evt->queue);
1434                 del_timer(&evt->timer);
1435 
1436                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1437                  * Firmware will send a CRQ with a transport event (0xFF) to
1438                  * tell this client what has happened to the transport. This
1439                  * will be handled in ibmvfc_handle_crq()
1440                  */
1441                 if (rc == H_CLOSED) {
1442                         if (printk_ratelimit())
1443                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1444                         if (evt->cmnd)
1445                                 scsi_dma_unmap(evt->cmnd);
1446                         ibmvfc_free_event(evt);
1447                         return SCSI_MLQUEUE_HOST_BUSY;
1448                 }
1449 
1450                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1451                 if (evt->cmnd) {
1452                         evt->cmnd->result = DID_ERROR << 16;
1453                         evt->done = ibmvfc_scsi_eh_done;
1454                 } else
1455                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1456 
1457                 evt->done(evt);
1458         } else
1459                 ibmvfc_trc_start(evt);
1460 
1461         return 0;
1462 }
1463 
1464 /**
1465  * ibmvfc_log_error - Log an error for the failed command if appropriate
1466  * @evt:        ibmvfc event to log
1467  *
1468  **/
1469 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1470 {
1471         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1472         struct ibmvfc_host *vhost = evt->vhost;
1473         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1474         struct scsi_cmnd *cmnd = evt->cmnd;
1475         const char *err = unknown_error;
1476         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1477         int logerr = 0;
1478         int rsp_code = 0;
1479 
1480         if (index >= 0) {
1481                 logerr = cmd_status[index].log;
1482                 err = cmd_status[index].name;
1483         }
1484 
1485         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1486                 return;
1487 
1488         if (rsp->flags & FCP_RSP_LEN_VALID)
1489                 rsp_code = rsp->data.info.rsp_code;
1490 
1491         scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1492                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1493                     cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1494                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1495 }
1496 
1497 /**
1498  * ibmvfc_relogin - Log back into the specified device
1499  * @sdev:       scsi device struct
1500  *
1501  **/
1502 static void ibmvfc_relogin(struct scsi_device *sdev)
1503 {
1504         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1505         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1506         struct ibmvfc_target *tgt;
1507 
1508         list_for_each_entry(tgt, &vhost->targets, queue) {
1509                 if (rport == tgt->rport) {
1510                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1511                         break;
1512                 }
1513         }
1514 
1515         ibmvfc_reinit_host(vhost);
1516 }
1517 
1518 /**
1519  * ibmvfc_scsi_done - Handle responses from commands
1520  * @evt:        ibmvfc event to be handled
1521  *
1522  * Used as a callback when sending scsi cmds.
1523  **/
1524 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1525 {
1526         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1527         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1528         struct scsi_cmnd *cmnd = evt->cmnd;
1529         u32 rsp_len = 0;
1530         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1531 
1532         if (cmnd) {
1533                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1534                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1535                 else if (rsp->flags & FCP_RESID_UNDER)
1536                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1537                 else
1538                         scsi_set_resid(cmnd, 0);
1539 
1540                 if (vfc_cmd->status) {
1541                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1542 
1543                         if (rsp->flags & FCP_RSP_LEN_VALID)
1544                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1545                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1546                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1547                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1548                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1549                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1550                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1551                                 ibmvfc_relogin(cmnd->device);
1552 
1553                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1554                                 cmnd->result = (DID_ERROR << 16);
1555 
1556                         ibmvfc_log_error(evt);
1557                 }
1558 
1559                 if (!cmnd->result &&
1560                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1561                         cmnd->result = (DID_ERROR << 16);
1562 
1563                 scsi_dma_unmap(cmnd);
1564                 cmnd->scsi_done(cmnd);
1565         }
1566 
1567         if (evt->eh_comp)
1568                 complete(evt->eh_comp);
1569 
1570         ibmvfc_free_event(evt);
1571 }
1572 
1573 /**
1574  * ibmvfc_host_chkready - Check if the host can accept commands
1575  * @vhost:       struct ibmvfc host
1576  *
1577  * Returns:
1578  *      1 if host can accept command / 0 if not
1579  **/
1580 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1581 {
1582         int result = 0;
1583 
1584         switch (vhost->state) {
1585         case IBMVFC_LINK_DEAD:
1586         case IBMVFC_HOST_OFFLINE:
1587                 result = DID_NO_CONNECT << 16;
1588                 break;
1589         case IBMVFC_NO_CRQ:
1590         case IBMVFC_INITIALIZING:
1591         case IBMVFC_HALTED:
1592         case IBMVFC_LINK_DOWN:
1593                 result = DID_REQUEUE << 16;
1594                 break;
1595         case IBMVFC_ACTIVE:
1596                 result = 0;
1597                 break;
1598         };
1599 
1600         return result;
1601 }
1602 
1603 /**
1604  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1605  * @cmnd:       struct scsi_cmnd to be executed
1606  * @done:       Callback function to be called when cmnd is completed
1607  *
1608  * Returns:
1609  *      0 on success / other on failure
1610  **/
1611 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1612                                void (*done) (struct scsi_cmnd *))
1613 {
1614         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1615         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1616         struct ibmvfc_cmd *vfc_cmd;
1617         struct ibmvfc_event *evt;
1618         u8 tag[2];
1619         int rc;
1620 
1621         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1622             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1623                 cmnd->result = rc;
1624                 done(cmnd);
1625                 return 0;
1626         }
1627 
1628         cmnd->result = (DID_OK << 16);
1629         evt = ibmvfc_get_event(vhost);
1630         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1631         evt->cmnd = cmnd;
1632         cmnd->scsi_done = done;
1633         vfc_cmd = &evt->iu.cmd;
1634         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1635         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1636         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1637         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1638         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1639         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1640         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1641         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1642         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1643         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1644         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1645 
1646         if (scsi_populate_tag_msg(cmnd, tag)) {
1647                 vfc_cmd->task_tag = cpu_to_be64(tag[1]);
1648                 switch (tag[0]) {
1649                 case MSG_SIMPLE_TAG:
1650                         vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1651                         break;
1652                 case MSG_HEAD_TAG:
1653                         vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1654                         break;
1655                 case MSG_ORDERED_TAG:
1656                         vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1657                         break;
1658                 };
1659         }
1660 
1661         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1662                 return ibmvfc_send_event(evt, vhost, 0);
1663 
1664         ibmvfc_free_event(evt);
1665         if (rc == -ENOMEM)
1666                 return SCSI_MLQUEUE_HOST_BUSY;
1667 
1668         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1669                 scmd_printk(KERN_ERR, cmnd,
1670                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1671 
1672         cmnd->result = DID_ERROR << 16;
1673         done(cmnd);
1674         return 0;
1675 }
1676 
1677 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1678 
1679 /**
1680  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1681  * @evt:        ibmvfc event struct
1682  *
1683  **/
1684 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1685 {
1686         /* copy the response back */
1687         if (evt->sync_iu)
1688                 *evt->sync_iu = *evt->xfer_iu;
1689 
1690         complete(&evt->comp);
1691 }
1692 
1693 /**
1694  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1695  * @evt:        struct ibmvfc_event
1696  *
1697  **/
1698 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1699 {
1700         struct ibmvfc_host *vhost = evt->vhost;
1701 
1702         ibmvfc_free_event(evt);
1703         vhost->aborting_passthru = 0;
1704         dev_info(vhost->dev, "Passthru command cancelled\n");
1705 }
1706 
1707 /**
1708  * ibmvfc_bsg_timeout - Handle a BSG timeout
1709  * @job:        struct fc_bsg_job that timed out
1710  *
1711  * Returns:
1712  *      0 on success / other on failure
1713  **/
1714 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1715 {
1716         struct ibmvfc_host *vhost = shost_priv(job->shost);
1717         unsigned long port_id = (unsigned long)job->dd_data;
1718         struct ibmvfc_event *evt;
1719         struct ibmvfc_tmf *tmf;
1720         unsigned long flags;
1721         int rc;
1722 
1723         ENTER;
1724         spin_lock_irqsave(vhost->host->host_lock, flags);
1725         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1726                 __ibmvfc_reset_host(vhost);
1727                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1728                 return 0;
1729         }
1730 
1731         vhost->aborting_passthru = 1;
1732         evt = ibmvfc_get_event(vhost);
1733         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1734 
1735         tmf = &evt->iu.tmf;
1736         memset(tmf, 0, sizeof(*tmf));
1737         tmf->common.version = cpu_to_be32(1);
1738         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1739         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1740         tmf->scsi_id = cpu_to_be64(port_id);
1741         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1742         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1743         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1744 
1745         if (rc != 0) {
1746                 vhost->aborting_passthru = 0;
1747                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1748                 rc = -EIO;
1749         } else
1750                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1751                          port_id);
1752 
1753         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1754 
1755         LEAVE;
1756         return rc;
1757 }
1758 
1759 /**
1760  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1761  * @vhost:              struct ibmvfc_host to send command
1762  * @port_id:    port ID to send command
1763  *
1764  * Returns:
1765  *      0 on success / other on failure
1766  **/
1767 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1768 {
1769         struct ibmvfc_port_login *plogi;
1770         struct ibmvfc_target *tgt;
1771         struct ibmvfc_event *evt;
1772         union ibmvfc_iu rsp_iu;
1773         unsigned long flags;
1774         int rc = 0, issue_login = 1;
1775 
1776         ENTER;
1777         spin_lock_irqsave(vhost->host->host_lock, flags);
1778         list_for_each_entry(tgt, &vhost->targets, queue) {
1779                 if (tgt->scsi_id == port_id) {
1780                         issue_login = 0;
1781                         break;
1782                 }
1783         }
1784 
1785         if (!issue_login)
1786                 goto unlock_out;
1787         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1788                 goto unlock_out;
1789 
1790         evt = ibmvfc_get_event(vhost);
1791         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1792         plogi = &evt->iu.plogi;
1793         memset(plogi, 0, sizeof(*plogi));
1794         plogi->common.version = cpu_to_be32(1);
1795         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1796         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1797         plogi->scsi_id = cpu_to_be64(port_id);
1798         evt->sync_iu = &rsp_iu;
1799         init_completion(&evt->comp);
1800 
1801         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1802         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1803 
1804         if (rc)
1805                 return -EIO;
1806 
1807         wait_for_completion(&evt->comp);
1808 
1809         if (rsp_iu.plogi.common.status)
1810                 rc = -EIO;
1811 
1812         spin_lock_irqsave(vhost->host->host_lock, flags);
1813         ibmvfc_free_event(evt);
1814 unlock_out:
1815         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1816         LEAVE;
1817         return rc;
1818 }
1819 
1820 /**
1821  * ibmvfc_bsg_request - Handle a BSG request
1822  * @job:        struct fc_bsg_job to be executed
1823  *
1824  * Returns:
1825  *      0 on success / other on failure
1826  **/
1827 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1828 {
1829         struct ibmvfc_host *vhost = shost_priv(job->shost);
1830         struct fc_rport *rport = job->rport;
1831         struct ibmvfc_passthru_mad *mad;
1832         struct ibmvfc_event *evt;
1833         union ibmvfc_iu rsp_iu;
1834         unsigned long flags, port_id = -1;
1835         unsigned int code = job->request->msgcode;
1836         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1837         u32 fc_flags, rsp_len;
1838 
1839         ENTER;
1840         job->reply->reply_payload_rcv_len = 0;
1841         if (rport)
1842                 port_id = rport->port_id;
1843 
1844         switch (code) {
1845         case FC_BSG_HST_ELS_NOLOGIN:
1846                 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1847                         (job->request->rqst_data.h_els.port_id[1] << 8) |
1848                         job->request->rqst_data.h_els.port_id[2];
1849         case FC_BSG_RPT_ELS:
1850                 fc_flags = IBMVFC_FC_ELS;
1851                 break;
1852         case FC_BSG_HST_CT:
1853                 issue_login = 1;
1854                 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1855                         (job->request->rqst_data.h_ct.port_id[1] << 8) |
1856                         job->request->rqst_data.h_ct.port_id[2];
1857         case FC_BSG_RPT_CT:
1858                 fc_flags = IBMVFC_FC_CT_IU;
1859                 break;
1860         default:
1861                 return -ENOTSUPP;
1862         };
1863 
1864         if (port_id == -1)
1865                 return -EINVAL;
1866         if (!mutex_trylock(&vhost->passthru_mutex))
1867                 return -EBUSY;
1868 
1869         job->dd_data = (void *)port_id;
1870         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1871                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1872 
1873         if (!req_seg) {
1874                 mutex_unlock(&vhost->passthru_mutex);
1875                 return -ENOMEM;
1876         }
1877 
1878         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1879                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1880 
1881         if (!rsp_seg) {
1882                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1883                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1884                 mutex_unlock(&vhost->passthru_mutex);
1885                 return -ENOMEM;
1886         }
1887 
1888         if (req_seg > 1 || rsp_seg > 1) {
1889                 rc = -EINVAL;
1890                 goto out;
1891         }
1892 
1893         if (issue_login)
1894                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1895 
1896         spin_lock_irqsave(vhost->host->host_lock, flags);
1897 
1898         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1899             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1900                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1901                 goto out;
1902         }
1903 
1904         evt = ibmvfc_get_event(vhost);
1905         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1906         mad = &evt->iu.passthru;
1907 
1908         memset(mad, 0, sizeof(*mad));
1909         mad->common.version = cpu_to_be32(1);
1910         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1911         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1912 
1913         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1914                 offsetof(struct ibmvfc_passthru_mad, iu));
1915         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1916 
1917         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1918         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1919         mad->iu.flags = cpu_to_be32(fc_flags);
1920         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1921 
1922         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1923         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1924         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1925         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1926         mad->iu.scsi_id = cpu_to_be64(port_id);
1927         mad->iu.tag = cpu_to_be64((u64)evt);
1928         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1929 
1930         evt->sync_iu = &rsp_iu;
1931         init_completion(&evt->comp);
1932         rc = ibmvfc_send_event(evt, vhost, 0);
1933         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1934 
1935         if (rc) {
1936                 rc = -EIO;
1937                 goto out;
1938         }
1939 
1940         wait_for_completion(&evt->comp);
1941 
1942         if (rsp_iu.passthru.common.status)
1943                 rc = -EIO;
1944         else
1945                 job->reply->reply_payload_rcv_len = rsp_len;
1946 
1947         spin_lock_irqsave(vhost->host->host_lock, flags);
1948         ibmvfc_free_event(evt);
1949         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1950         job->reply->result = rc;
1951         job->job_done(job);
1952         rc = 0;
1953 out:
1954         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1955                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1956         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1957                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1958         mutex_unlock(&vhost->passthru_mutex);
1959         LEAVE;
1960         return rc;
1961 }
1962 
1963 /**
1964  * ibmvfc_reset_device - Reset the device with the specified reset type
1965  * @sdev:       scsi device to reset
1966  * @type:       reset type
1967  * @desc:       reset type description for log messages
1968  *
1969  * Returns:
1970  *      0 on success / other on failure
1971  **/
1972 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1973 {
1974         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1975         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1976         struct ibmvfc_cmd *tmf;
1977         struct ibmvfc_event *evt = NULL;
1978         union ibmvfc_iu rsp_iu;
1979         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1980         int rsp_rc = -EBUSY;
1981         unsigned long flags;
1982         int rsp_code = 0;
1983 
1984         spin_lock_irqsave(vhost->host->host_lock, flags);
1985         if (vhost->state == IBMVFC_ACTIVE) {
1986                 evt = ibmvfc_get_event(vhost);
1987                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1988 
1989                 tmf = &evt->iu.cmd;
1990                 memset(tmf, 0, sizeof(*tmf));
1991                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1992                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1993                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1994                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1995                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1996                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1997                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1998                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1999                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2000                 tmf->iu.tmf_flags = type;
2001                 evt->sync_iu = &rsp_iu;
2002 
2003                 init_completion(&evt->comp);
2004                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2005         }
2006         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2007 
2008         if (rsp_rc != 0) {
2009                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2010                             desc, rsp_rc);
2011                 return -EIO;
2012         }
2013 
2014         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2015         wait_for_completion(&evt->comp);
2016 
2017         if (rsp_iu.cmd.status)
2018                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2019 
2020         if (rsp_code) {
2021                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2022                         rsp_code = fc_rsp->data.info.rsp_code;
2023 
2024                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2025                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2026                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2027                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2028                             fc_rsp->scsi_status);
2029                 rsp_rc = -EIO;
2030         } else
2031                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2032 
2033         spin_lock_irqsave(vhost->host->host_lock, flags);
2034         ibmvfc_free_event(evt);
2035         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2036         return rsp_rc;
2037 }
2038 
2039 /**
2040  * ibmvfc_match_rport - Match function for specified remote port
2041  * @evt:        ibmvfc event struct
2042  * @device:     device to match (rport)
2043  *
2044  * Returns:
2045  *      1 if event matches rport / 0 if event does not match rport
2046  **/
2047 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2048 {
2049         struct fc_rport *cmd_rport;
2050 
2051         if (evt->cmnd) {
2052                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2053                 if (cmd_rport == rport)
2054                         return 1;
2055         }
2056         return 0;
2057 }
2058 
2059 /**
2060  * ibmvfc_match_target - Match function for specified target
2061  * @evt:        ibmvfc event struct
2062  * @device:     device to match (starget)
2063  *
2064  * Returns:
2065  *      1 if event matches starget / 0 if event does not match starget
2066  **/
2067 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2068 {
2069         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2070                 return 1;
2071         return 0;
2072 }
2073 
2074 /**
2075  * ibmvfc_match_lun - Match function for specified LUN
2076  * @evt:        ibmvfc event struct
2077  * @device:     device to match (sdev)
2078  *
2079  * Returns:
2080  *      1 if event matches sdev / 0 if event does not match sdev
2081  **/
2082 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2083 {
2084         if (evt->cmnd && evt->cmnd->device == device)
2085                 return 1;
2086         return 0;
2087 }
2088 
2089 /**
2090  * ibmvfc_wait_for_ops - Wait for ops to complete
2091  * @vhost:      ibmvfc host struct
2092  * @device:     device to match (starget or sdev)
2093  * @match:      match function
2094  *
2095  * Returns:
2096  *      SUCCESS / FAILED
2097  **/
2098 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2099                                int (*match) (struct ibmvfc_event *, void *))
2100 {
2101         struct ibmvfc_event *evt;
2102         DECLARE_COMPLETION_ONSTACK(comp);
2103         int wait;
2104         unsigned long flags;
2105         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2106 
2107         ENTER;
2108         do {
2109                 wait = 0;
2110                 spin_lock_irqsave(vhost->host->host_lock, flags);
2111                 list_for_each_entry(evt, &vhost->sent, queue) {
2112                         if (match(evt, device)) {
2113                                 evt->eh_comp = &comp;
2114                                 wait++;
2115                         }
2116                 }
2117                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2118 
2119                 if (wait) {
2120                         timeout = wait_for_completion_timeout(&comp, timeout);
2121 
2122                         if (!timeout) {
2123                                 wait = 0;
2124                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2125                                 list_for_each_entry(evt, &vhost->sent, queue) {
2126                                         if (match(evt, device)) {
2127                                                 evt->eh_comp = NULL;
2128                                                 wait++;
2129                                         }
2130                                 }
2131                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2132                                 if (wait)
2133                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2134                                 LEAVE;
2135                                 return wait ? FAILED : SUCCESS;
2136                         }
2137                 }
2138         } while (wait);
2139 
2140         LEAVE;
2141         return SUCCESS;
2142 }
2143 
2144 /**
2145  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2146  * @sdev:       scsi device to cancel commands
2147  * @type:       type of error recovery being performed
2148  *
2149  * This sends a cancel to the VIOS for the specified device. This does
2150  * NOT send any abort to the actual device. That must be done separately.
2151  *
2152  * Returns:
2153  *      0 on success / other on failure
2154  **/
2155 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2156 {
2157         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2158         struct scsi_target *starget = scsi_target(sdev);
2159         struct fc_rport *rport = starget_to_rport(starget);
2160         struct ibmvfc_tmf *tmf;
2161         struct ibmvfc_event *evt, *found_evt;
2162         union ibmvfc_iu rsp;
2163         int rsp_rc = -EBUSY;
2164         unsigned long flags;
2165         u16 status;
2166 
2167         ENTER;
2168         spin_lock_irqsave(vhost->host->host_lock, flags);
2169         found_evt = NULL;
2170         list_for_each_entry(evt, &vhost->sent, queue) {
2171                 if (evt->cmnd && evt->cmnd->device == sdev) {
2172                         found_evt = evt;
2173                         break;
2174                 }
2175         }
2176 
2177         if (!found_evt) {
2178                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2179                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2180                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2181                 return 0;
2182         }
2183 
2184         if (vhost->logged_in) {
2185                 evt = ibmvfc_get_event(vhost);
2186                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2187 
2188                 tmf = &evt->iu.tmf;
2189                 memset(tmf, 0, sizeof(*tmf));
2190                 tmf->common.version = cpu_to_be32(1);
2191                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2192                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2193                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2194                 int_to_scsilun(sdev->lun, &tmf->lun);
2195                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2196                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2197                 if (vhost->state == IBMVFC_ACTIVE)
2198                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2199                 else
2200                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2201                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2202                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2203 
2204                 evt->sync_iu = &rsp;
2205                 init_completion(&evt->comp);
2206                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2207         }
2208 
2209         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2210 
2211         if (rsp_rc != 0) {
2212                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2213                 /* If failure is received, the host adapter is most likely going
2214                  through reset, return success so the caller will wait for the command
2215                  being cancelled to get returned */
2216                 return 0;
2217         }
2218 
2219         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2220 
2221         wait_for_completion(&evt->comp);
2222         status = be16_to_cpu(rsp.mad_common.status);
2223         spin_lock_irqsave(vhost->host->host_lock, flags);
2224         ibmvfc_free_event(evt);
2225         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2226 
2227         if (status != IBMVFC_MAD_SUCCESS) {
2228                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2229                 switch (status) {
2230                 case IBMVFC_MAD_DRIVER_FAILED:
2231                 case IBMVFC_MAD_CRQ_ERROR:
2232                         /* Host adapter most likely going through reset, return success to
2233                          the caller will wait for the command being cancelled to get returned */
2234                         return 0;
2235                 default:
2236                         return -EIO;
2237                 };
2238         }
2239 
2240         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2241         return 0;
2242 }
2243 
2244 /**
2245  * ibmvfc_match_key - Match function for specified cancel key
2246  * @evt:        ibmvfc event struct
2247  * @key:        cancel key to match
2248  *
2249  * Returns:
2250  *      1 if event matches key / 0 if event does not match key
2251  **/
2252 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2253 {
2254         unsigned long cancel_key = (unsigned long)key;
2255 
2256         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2257             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2258                 return 1;
2259         return 0;
2260 }
2261 
2262 /**
2263  * ibmvfc_match_evt - Match function for specified event
2264  * @evt:        ibmvfc event struct
2265  * @match:      event to match
2266  *
2267  * Returns:
2268  *      1 if event matches key / 0 if event does not match key
2269  **/
2270 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2271 {
2272         if (evt == match)
2273                 return 1;
2274         return 0;
2275 }
2276 
2277 /**
2278  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2279  * @sdev:       scsi device to abort commands
2280  *
2281  * This sends an Abort Task Set to the VIOS for the specified device. This does
2282  * NOT send any cancel to the VIOS. That must be done separately.
2283  *
2284  * Returns:
2285  *      0 on success / other on failure
2286  **/
2287 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2288 {
2289         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2290         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2291         struct ibmvfc_cmd *tmf;
2292         struct ibmvfc_event *evt, *found_evt;
2293         union ibmvfc_iu rsp_iu;
2294         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2295         int rc, rsp_rc = -EBUSY;
2296         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2297         int rsp_code = 0;
2298 
2299         spin_lock_irqsave(vhost->host->host_lock, flags);
2300         found_evt = NULL;
2301         list_for_each_entry(evt, &vhost->sent, queue) {
2302                 if (evt->cmnd && evt->cmnd->device == sdev) {
2303                         found_evt = evt;
2304                         break;
2305                 }
2306         }
2307 
2308         if (!found_evt) {
2309                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2310                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2311                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2312                 return 0;
2313         }
2314 
2315         if (vhost->state == IBMVFC_ACTIVE) {
2316                 evt = ibmvfc_get_event(vhost);
2317                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2318 
2319                 tmf = &evt->iu.cmd;
2320                 memset(tmf, 0, sizeof(*tmf));
2321                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2322                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2323                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2324                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2325                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2326                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2327                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2328                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2329                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2330                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2331                 evt->sync_iu = &rsp_iu;
2332 
2333                 init_completion(&evt->comp);
2334                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2335         }
2336 
2337         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2338 
2339         if (rsp_rc != 0) {
2340                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2341                 return -EIO;
2342         }
2343 
2344         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2345         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2346 
2347         if (!timeout) {
2348                 rc = ibmvfc_cancel_all(sdev, 0);
2349                 if (!rc) {
2350                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2351                         if (rc == SUCCESS)
2352                                 rc = 0;
2353                 }
2354 
2355                 if (rc) {
2356                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2357                         ibmvfc_reset_host(vhost);
2358                         rsp_rc = -EIO;
2359                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2360 
2361                         if (rc == SUCCESS)
2362                                 rsp_rc = 0;
2363 
2364                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2365                         if (rc != SUCCESS) {
2366                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2367                                 ibmvfc_hard_reset_host(vhost);
2368                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2369                                 rsp_rc = 0;
2370                         }
2371 
2372                         goto out;
2373                 }
2374         }
2375 
2376         if (rsp_iu.cmd.status)
2377                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2378 
2379         if (rsp_code) {
2380                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2381                         rsp_code = fc_rsp->data.info.rsp_code;
2382 
2383                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2384                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2385                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2386                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2387                             fc_rsp->scsi_status);
2388                 rsp_rc = -EIO;
2389         } else
2390                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2391 
2392 out:
2393         spin_lock_irqsave(vhost->host->host_lock, flags);
2394         ibmvfc_free_event(evt);
2395         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2396         return rsp_rc;
2397 }
2398 
2399 /**
2400  * ibmvfc_eh_abort_handler - Abort a command
2401  * @cmd:        scsi command to abort
2402  *
2403  * Returns:
2404  *      SUCCESS / FAST_IO_FAIL / FAILED
2405  **/
2406 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2407 {
2408         struct scsi_device *sdev = cmd->device;
2409         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2410         int cancel_rc, block_rc;
2411         int rc = FAILED;
2412 
2413         ENTER;
2414         block_rc = fc_block_scsi_eh(cmd);
2415         ibmvfc_wait_while_resetting(vhost);
2416         if (block_rc != FAST_IO_FAIL) {
2417                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2418                 ibmvfc_abort_task_set(sdev);
2419         } else
2420                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2421 
2422         if (!cancel_rc)
2423                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2424 
2425         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2426                 rc = FAST_IO_FAIL;
2427 
2428         LEAVE;
2429         return rc;
2430 }
2431 
2432 /**
2433  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2434  * @cmd:        scsi command struct
2435  *
2436  * Returns:
2437  *      SUCCESS / FAST_IO_FAIL / FAILED
2438  **/
2439 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2440 {
2441         struct scsi_device *sdev = cmd->device;
2442         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2443         int cancel_rc, block_rc, reset_rc = 0;
2444         int rc = FAILED;
2445 
2446         ENTER;
2447         block_rc = fc_block_scsi_eh(cmd);
2448         ibmvfc_wait_while_resetting(vhost);
2449         if (block_rc != FAST_IO_FAIL) {
2450                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2451                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2452         } else
2453                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2454 
2455         if (!cancel_rc && !reset_rc)
2456                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2457 
2458         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2459                 rc = FAST_IO_FAIL;
2460 
2461         LEAVE;
2462         return rc;
2463 }
2464 
2465 /**
2466  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2467  * @sdev:       scsi device struct
2468  * @data:       return code
2469  *
2470  **/
2471 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2472 {
2473         unsigned long *rc = data;
2474         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2475 }
2476 
2477 /**
2478  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2479  * @sdev:       scsi device struct
2480  * @data:       return code
2481  *
2482  **/
2483 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2484 {
2485         unsigned long *rc = data;
2486         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2487 }
2488 
2489 /**
2490  * ibmvfc_eh_target_reset_handler - Reset the target
2491  * @cmd:        scsi command struct
2492  *
2493  * Returns:
2494  *      SUCCESS / FAST_IO_FAIL / FAILED
2495  **/
2496 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2497 {
2498         struct scsi_device *sdev = cmd->device;
2499         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2500         struct scsi_target *starget = scsi_target(sdev);
2501         int block_rc;
2502         int reset_rc = 0;
2503         int rc = FAILED;
2504         unsigned long cancel_rc = 0;
2505 
2506         ENTER;
2507         block_rc = fc_block_scsi_eh(cmd);
2508         ibmvfc_wait_while_resetting(vhost);
2509         if (block_rc != FAST_IO_FAIL) {
2510                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2511                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2512         } else
2513                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2514 
2515         if (!cancel_rc && !reset_rc)
2516                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2517 
2518         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2519                 rc = FAST_IO_FAIL;
2520 
2521         LEAVE;
2522         return rc;
2523 }
2524 
2525 /**
2526  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2527  * @cmd:        struct scsi_cmnd having problems
2528  *
2529  **/
2530 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2531 {
2532         int rc, block_rc;
2533         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2534 
2535         block_rc = fc_block_scsi_eh(cmd);
2536         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2537         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2538 
2539         if (block_rc == FAST_IO_FAIL)
2540                 return FAST_IO_FAIL;
2541 
2542         return rc ? FAILED : SUCCESS;
2543 }
2544 
2545 /**
2546  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2547  * @rport:              rport struct
2548  *
2549  * Return value:
2550  *      none
2551  **/
2552 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2553 {
2554         struct Scsi_Host *shost = rport_to_shost(rport);
2555         struct ibmvfc_host *vhost = shost_priv(shost);
2556         struct fc_rport *dev_rport;
2557         struct scsi_device *sdev;
2558         unsigned long rc;
2559 
2560         ENTER;
2561         shost_for_each_device(sdev, shost) {
2562                 dev_rport = starget_to_rport(scsi_target(sdev));
2563                 if (dev_rport != rport)
2564                         continue;
2565                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2566         }
2567 
2568         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2569 
2570         if (rc == FAILED)
2571                 ibmvfc_issue_fc_host_lip(shost);
2572         LEAVE;
2573 }
2574 
2575 static const struct ibmvfc_async_desc ae_desc [] = {
2576         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2577         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2578         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2579         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2580         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2581         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2582         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2583         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2584         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2585         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2586         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2587         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2588         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2589 };
2590 
2591 static const struct ibmvfc_async_desc unknown_ae = {
2592         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2593 };
2594 
2595 /**
2596  * ibmvfc_get_ae_desc - Get text description for async event
2597  * @ae: async event
2598  *
2599  **/
2600 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2601 {
2602         int i;
2603 
2604         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2605                 if (ae_desc[i].ae == ae)
2606                         return &ae_desc[i];
2607 
2608         return &unknown_ae;
2609 }
2610 
2611 static const struct {
2612         enum ibmvfc_ae_link_state state;
2613         const char *desc;
2614 } link_desc [] = {
2615         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2616         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2617         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2618         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2619 };
2620 
2621 /**
2622  * ibmvfc_get_link_state - Get text description for link state
2623  * @state:      link state
2624  *
2625  **/
2626 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2627 {
2628         int i;
2629 
2630         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2631                 if (link_desc[i].state == state)
2632                         return link_desc[i].desc;
2633 
2634         return "";
2635 }
2636 
2637 /**
2638  * ibmvfc_handle_async - Handle an async event from the adapter
2639  * @crq:        crq to process
2640  * @vhost:      ibmvfc host struct
2641  *
2642  **/
2643 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2644                                 struct ibmvfc_host *vhost)
2645 {
2646         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2647         struct ibmvfc_target *tgt;
2648 
2649         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2650                    " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
2651                    ibmvfc_get_link_state(crq->link_state));
2652 
2653         switch (be64_to_cpu(crq->event)) {
2654         case IBMVFC_AE_RESUME:
2655                 switch (crq->link_state) {
2656                 case IBMVFC_AE_LS_LINK_DOWN:
2657                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2658                         break;
2659                 case IBMVFC_AE_LS_LINK_DEAD:
2660                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2661                         break;
2662                 case IBMVFC_AE_LS_LINK_UP:
2663                 case IBMVFC_AE_LS_LINK_BOUNCED:
2664                 default:
2665                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2666                         vhost->delay_init = 1;
2667                         __ibmvfc_reset_host(vhost);
2668                         break;
2669                 };
2670 
2671                 break;
2672         case IBMVFC_AE_LINK_UP:
2673                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2674                 vhost->delay_init = 1;
2675                 __ibmvfc_reset_host(vhost);
2676                 break;
2677         case IBMVFC_AE_SCN_FABRIC:
2678         case IBMVFC_AE_SCN_DOMAIN:
2679                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2680                 if (vhost->state < IBMVFC_HALTED) {
2681                         vhost->delay_init = 1;
2682                         __ibmvfc_reset_host(vhost);
2683                 }
2684                 break;
2685         case IBMVFC_AE_SCN_NPORT:
2686         case IBMVFC_AE_SCN_GROUP:
2687                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2688                 ibmvfc_reinit_host(vhost);
2689                 break;
2690         case IBMVFC_AE_ELS_LOGO:
2691         case IBMVFC_AE_ELS_PRLO:
2692         case IBMVFC_AE_ELS_PLOGI:
2693                 list_for_each_entry(tgt, &vhost->targets, queue) {
2694                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2695                                 break;
2696                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2697                                 continue;
2698                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2699                                 continue;
2700                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2701                                 continue;
2702                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2703                                 tgt->logo_rcvd = 1;
2704                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2705                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2706                                 ibmvfc_reinit_host(vhost);
2707                         }
2708                 }
2709                 break;
2710         case IBMVFC_AE_LINK_DOWN:
2711         case IBMVFC_AE_ADAPTER_FAILED:
2712                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2713                 break;
2714         case IBMVFC_AE_LINK_DEAD:
2715                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2716                 break;
2717         case IBMVFC_AE_HALT:
2718                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2719                 break;
2720         default:
2721                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2722                 break;
2723         };
2724 }
2725 
2726 /**
2727  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2728  * @crq:        Command/Response queue
2729  * @vhost:      ibmvfc host struct
2730  *
2731  **/
2732 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2733 {
2734         long rc;
2735         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2736 
2737         switch (crq->valid) {
2738         case IBMVFC_CRQ_INIT_RSP:
2739                 switch (crq->format) {
2740                 case IBMVFC_CRQ_INIT:
2741                         dev_info(vhost->dev, "Partner initialized\n");
2742                         /* Send back a response */
2743                         rc = ibmvfc_send_crq_init_complete(vhost);
2744                         if (rc == 0)
2745                                 ibmvfc_init_host(vhost);
2746                         else
2747                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2748                         break;
2749                 case IBMVFC_CRQ_INIT_COMPLETE:
2750                         dev_info(vhost->dev, "Partner initialization complete\n");
2751                         ibmvfc_init_host(vhost);
2752                         break;
2753                 default:
2754                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2755                 }
2756                 return;
2757         case IBMVFC_CRQ_XPORT_EVENT:
2758                 vhost->state = IBMVFC_NO_CRQ;
2759                 vhost->logged_in = 0;
2760                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2761                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2762                         /* We need to re-setup the interpartition connection */
2763                         dev_info(vhost->dev, "Re-enabling adapter\n");
2764                         vhost->client_migrated = 1;
2765                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2766                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2767                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2768                 } else {
2769                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2770                         ibmvfc_purge_requests(vhost, DID_ERROR);
2771                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2772                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2773                 }
2774                 return;
2775         case IBMVFC_CRQ_CMD_RSP:
2776                 break;
2777         default:
2778                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2779                 return;
2780         }
2781 
2782         if (crq->format == IBMVFC_ASYNC_EVENT)
2783                 return;
2784 
2785         /* The only kind of payload CRQs we should get are responses to
2786          * things we send. Make sure this response is to something we
2787          * actually sent
2788          */
2789         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2790                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2791                         crq->ioba);
2792                 return;
2793         }
2794 
2795         if (unlikely(atomic_read(&evt->free))) {
2796                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2797                         crq->ioba);
2798                 return;
2799         }
2800 
2801         del_timer(&evt->timer);
2802         list_del(&evt->queue);
2803         ibmvfc_trc_end(evt);
2804         evt->done(evt);
2805 }
2806 
2807 /**
2808  * ibmvfc_scan_finished - Check if the device scan is done.
2809  * @shost:      scsi host struct
2810  * @time:       current elapsed time
2811  *
2812  * Returns:
2813  *      0 if scan is not done / 1 if scan is done
2814  **/
2815 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2816 {
2817         unsigned long flags;
2818         struct ibmvfc_host *vhost = shost_priv(shost);
2819         int done = 0;
2820 
2821         spin_lock_irqsave(shost->host_lock, flags);
2822         if (time >= (init_timeout * HZ)) {
2823                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2824                          "continuing initialization\n", init_timeout);
2825                 done = 1;
2826         }
2827 
2828         if (vhost->scan_complete)
2829                 done = 1;
2830         spin_unlock_irqrestore(shost->host_lock, flags);
2831         return done;
2832 }
2833 
2834 /**
2835  * ibmvfc_slave_alloc - Setup the device's task set value
2836  * @sdev:       struct scsi_device device to configure
2837  *
2838  * Set the device's task set value so that error handling works as
2839  * expected.
2840  *
2841  * Returns:
2842  *      0 on success / -ENXIO if device does not exist
2843  **/
2844 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2845 {
2846         struct Scsi_Host *shost = sdev->host;
2847         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2848         struct ibmvfc_host *vhost = shost_priv(shost);
2849         unsigned long flags = 0;
2850 
2851         if (!rport || fc_remote_port_chkready(rport))
2852                 return -ENXIO;
2853 
2854         spin_lock_irqsave(shost->host_lock, flags);
2855         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2856         spin_unlock_irqrestore(shost->host_lock, flags);
2857         return 0;
2858 }
2859 
2860 /**
2861  * ibmvfc_target_alloc - Setup the target's task set value
2862  * @starget:    struct scsi_target
2863  *
2864  * Set the target's task set value so that error handling works as
2865  * expected.
2866  *
2867  * Returns:
2868  *      0 on success / -ENXIO if device does not exist
2869  **/
2870 static int ibmvfc_target_alloc(struct scsi_target *starget)
2871 {
2872         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2873         struct ibmvfc_host *vhost = shost_priv(shost);
2874         unsigned long flags = 0;
2875 
2876         spin_lock_irqsave(shost->host_lock, flags);
2877         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2878         spin_unlock_irqrestore(shost->host_lock, flags);
2879         return 0;
2880 }
2881 
2882 /**
2883  * ibmvfc_slave_configure - Configure the device
2884  * @sdev:       struct scsi_device device to configure
2885  *
2886  * Enable allow_restart for a device if it is a disk. Adjust the
2887  * queue_depth here also.
2888  *
2889  * Returns:
2890  *      0
2891  **/
2892 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2893 {
2894         struct Scsi_Host *shost = sdev->host;
2895         unsigned long flags = 0;
2896 
2897         spin_lock_irqsave(shost->host_lock, flags);
2898         if (sdev->type == TYPE_DISK)
2899                 sdev->allow_restart = 1;
2900 
2901         if (sdev->tagged_supported) {
2902                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
2903                 scsi_activate_tcq(sdev, sdev->queue_depth);
2904         } else
2905                 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2906         spin_unlock_irqrestore(shost->host_lock, flags);
2907         return 0;
2908 }
2909 
2910 /**
2911  * ibmvfc_change_queue_depth - Change the device's queue depth
2912  * @sdev:       scsi device struct
2913  * @qdepth:     depth to set
2914  * @reason:     calling context
2915  *
2916  * Return value:
2917  *      actual depth set
2918  **/
2919 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth,
2920                                      int reason)
2921 {
2922         if (reason != SCSI_QDEPTH_DEFAULT)
2923                 return -EOPNOTSUPP;
2924 
2925         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2926                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2927 
2928         scsi_adjust_queue_depth(sdev, 0, qdepth);
2929         return sdev->queue_depth;
2930 }
2931 
2932 /**
2933  * ibmvfc_change_queue_type - Change the device's queue type
2934  * @sdev:               scsi device struct
2935  * @tag_type:   type of tags to use
2936  *
2937  * Return value:
2938  *      actual queue type set
2939  **/
2940 static int ibmvfc_change_queue_type(struct scsi_device *sdev, int tag_type)
2941 {
2942         if (sdev->tagged_supported) {
2943                 scsi_set_tag_type(sdev, tag_type);
2944 
2945                 if (tag_type)
2946                         scsi_activate_tcq(sdev, sdev->queue_depth);
2947                 else
2948                         scsi_deactivate_tcq(sdev, sdev->queue_depth);
2949         } else
2950                 tag_type = 0;
2951 
2952         return tag_type;
2953 }
2954 
2955 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2956                                                  struct device_attribute *attr, char *buf)
2957 {
2958         struct Scsi_Host *shost = class_to_shost(dev);
2959         struct ibmvfc_host *vhost = shost_priv(shost);
2960 
2961         return snprintf(buf, PAGE_SIZE, "%s\n",
2962                         vhost->login_buf->resp.partition_name);
2963 }
2964 
2965 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2966                                             struct device_attribute *attr, char *buf)
2967 {
2968         struct Scsi_Host *shost = class_to_shost(dev);
2969         struct ibmvfc_host *vhost = shost_priv(shost);
2970 
2971         return snprintf(buf, PAGE_SIZE, "%s\n",
2972                         vhost->login_buf->resp.device_name);
2973 }
2974 
2975 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2976                                          struct device_attribute *attr, char *buf)
2977 {
2978         struct Scsi_Host *shost = class_to_shost(dev);
2979         struct ibmvfc_host *vhost = shost_priv(shost);
2980 
2981         return snprintf(buf, PAGE_SIZE, "%s\n",
2982                         vhost->login_buf->resp.port_loc_code);
2983 }
2984 
2985 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2986                                          struct device_attribute *attr, char *buf)
2987 {
2988         struct Scsi_Host *shost = class_to_shost(dev);
2989         struct ibmvfc_host *vhost = shost_priv(shost);
2990 
2991         return snprintf(buf, PAGE_SIZE, "%s\n",
2992                         vhost->login_buf->resp.drc_name);
2993 }
2994 
2995 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2996                                              struct device_attribute *attr, char *buf)
2997 {
2998         struct Scsi_Host *shost = class_to_shost(dev);
2999         struct ibmvfc_host *vhost = shost_priv(shost);
3000         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
3001 }
3002 
3003 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3004                                              struct device_attribute *attr, char *buf)
3005 {
3006         struct Scsi_Host *shost = class_to_shost(dev);
3007         struct ibmvfc_host *vhost = shost_priv(shost);
3008         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
3009 }
3010 
3011 /**
3012  * ibmvfc_show_log_level - Show the adapter's error logging level
3013  * @dev:        class device struct
3014  * @buf:        buffer
3015  *
3016  * Return value:
3017  *      number of bytes printed to buffer
3018  **/
3019 static ssize_t ibmvfc_show_log_level(struct device *dev,
3020                                      struct device_attribute *attr, char *buf)
3021 {
3022         struct Scsi_Host *shost = class_to_shost(dev);
3023         struct ibmvfc_host *vhost = shost_priv(shost);
3024         unsigned long flags = 0;
3025         int len;
3026 
3027         spin_lock_irqsave(shost->host_lock, flags);
3028         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
3029         spin_unlock_irqrestore(shost->host_lock, flags);
3030         return len;
3031 }
3032 
3033 /**
3034  * ibmvfc_store_log_level - Change the adapter's error logging level
3035  * @dev:        class device struct
3036  * @buf:        buffer
3037  *
3038  * Return value:
3039  *      number of bytes printed to buffer
3040  **/
3041 static ssize_t ibmvfc_store_log_level(struct device *dev,
3042                                       struct device_attribute *attr,
3043                                       const char *buf, size_t count)
3044 {
3045         struct Scsi_Host *shost = class_to_shost(dev);
3046         struct ibmvfc_host *vhost = shost_priv(shost);
3047         unsigned long flags = 0;
3048 
3049         spin_lock_irqsave(shost->host_lock, flags);
3050         vhost->log_level = simple_strtoul(buf, NULL, 10);
3051         spin_unlock_irqrestore(shost->host_lock, flags);
3052         return strlen(buf);
3053 }
3054 
3055 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3056 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3057 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3058 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3059 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3060 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3061 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3062                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3063 
3064 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3065 /**
3066  * ibmvfc_read_trace - Dump the adapter trace
3067  * @filp:               open sysfs file
3068  * @kobj:               kobject struct
3069  * @bin_attr:   bin_attribute struct
3070  * @buf:                buffer
3071  * @off:                offset
3072  * @count:              buffer size
3073  *
3074  * Return value:
3075  *      number of bytes printed to buffer
3076  **/
3077 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3078                                  struct bin_attribute *bin_attr,
3079                                  char *buf, loff_t off, size_t count)
3080 {
3081         struct device *dev = container_of(kobj, struct device, kobj);
3082         struct Scsi_Host *shost = class_to_shost(dev);
3083         struct ibmvfc_host *vhost = shost_priv(shost);
3084         unsigned long flags = 0;
3085         int size = IBMVFC_TRACE_SIZE;
3086         char *src = (char *)vhost->trace;
3087 
3088         if (off > size)
3089                 return 0;
3090         if (off + count > size) {
3091                 size -= off;
3092                 count = size;
3093         }
3094 
3095         spin_lock_irqsave(shost->host_lock, flags);
3096         memcpy(buf, &src[off], count);
3097         spin_unlock_irqrestore(shost->host_lock, flags);
3098         return count;
3099 }
3100 
3101 static struct bin_attribute ibmvfc_trace_attr = {
3102         .attr = {
3103                 .name = "trace",
3104                 .mode = S_IRUGO,
3105         },
3106         .size = 0,
3107         .read = ibmvfc_read_trace,
3108 };
3109 #endif
3110 
3111 static struct device_attribute *ibmvfc_attrs[] = {
3112         &dev_attr_partition_name,
3113         &dev_attr_device_name,
3114         &dev_attr_port_loc_code,
3115         &dev_attr_drc_name,
3116         &dev_attr_npiv_version,
3117         &dev_attr_capabilities,
3118         &dev_attr_log_level,
3119         NULL
3120 };
3121 
3122 static struct scsi_host_template driver_template = {
3123         .module = THIS_MODULE,
3124         .name = "IBM POWER Virtual FC Adapter",
3125         .proc_name = IBMVFC_NAME,
3126         .queuecommand = ibmvfc_queuecommand,
3127         .eh_abort_handler = ibmvfc_eh_abort_handler,
3128         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3129         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3130         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3131         .slave_alloc = ibmvfc_slave_alloc,
3132         .slave_configure = ibmvfc_slave_configure,
3133         .target_alloc = ibmvfc_target_alloc,
3134         .scan_finished = ibmvfc_scan_finished,
3135         .change_queue_depth = ibmvfc_change_queue_depth,
3136         .change_queue_type = ibmvfc_change_queue_type,
3137         .cmd_per_lun = 16,
3138         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3139         .this_id = -1,
3140         .sg_tablesize = SG_ALL,
3141         .max_sectors = IBMVFC_MAX_SECTORS,
3142         .use_clustering = ENABLE_CLUSTERING,
3143         .shost_attrs = ibmvfc_attrs,
3144 };
3145 
3146 /**
3147  * ibmvfc_next_async_crq - Returns the next entry in async queue
3148  * @vhost:      ibmvfc host struct
3149  *
3150  * Returns:
3151  *      Pointer to next entry in queue / NULL if empty
3152  **/
3153 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3154 {
3155         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3156         struct ibmvfc_async_crq *crq;
3157 
3158         crq = &async_crq->msgs[async_crq->cur];
3159         if (crq->valid & 0x80) {
3160                 if (++async_crq->cur == async_crq->size)
3161                         async_crq->cur = 0;
3162                 rmb();
3163         } else
3164                 crq = NULL;
3165 
3166         return crq;
3167 }
3168 
3169 /**
3170  * ibmvfc_next_crq - Returns the next entry in message queue
3171  * @vhost:      ibmvfc host struct
3172  *
3173  * Returns:
3174  *      Pointer to next entry in queue / NULL if empty
3175  **/
3176 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3177 {
3178         struct ibmvfc_crq_queue *queue = &vhost->crq;
3179         struct ibmvfc_crq *crq;
3180 
3181         crq = &queue->msgs[queue->cur];
3182         if (crq->valid & 0x80) {
3183                 if (++queue->cur == queue->size)
3184                         queue->cur = 0;
3185                 rmb();
3186         } else
3187                 crq = NULL;
3188 
3189         return crq;
3190 }
3191 
3192 /**
3193  * ibmvfc_interrupt - Interrupt handler
3194  * @irq:                number of irq to handle, not used
3195  * @dev_instance: ibmvfc_host that received interrupt
3196  *
3197  * Returns:
3198  *      IRQ_HANDLED
3199  **/
3200 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3201 {
3202         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3203         unsigned long flags;
3204 
3205         spin_lock_irqsave(vhost->host->host_lock, flags);
3206         vio_disable_interrupts(to_vio_dev(vhost->dev));
3207         tasklet_schedule(&vhost->tasklet);
3208         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3209         return IRQ_HANDLED;
3210 }
3211 
3212 /**
3213  * ibmvfc_tasklet - Interrupt handler tasklet
3214  * @data:               ibmvfc host struct
3215  *
3216  * Returns:
3217  *      Nothing
3218  **/
3219 static void ibmvfc_tasklet(void *data)
3220 {
3221         struct ibmvfc_host *vhost = data;
3222         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3223         struct ibmvfc_crq *crq;
3224         struct ibmvfc_async_crq *async;
3225         unsigned long flags;
3226         int done = 0;
3227 
3228         spin_lock_irqsave(vhost->host->host_lock, flags);
3229         while (!done) {
3230                 /* Pull all the valid messages off the async CRQ */
3231                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3232                         ibmvfc_handle_async(async, vhost);
3233                         async->valid = 0;
3234                         wmb();
3235                 }
3236 
3237                 /* Pull all the valid messages off the CRQ */
3238                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3239                         ibmvfc_handle_crq(crq, vhost);
3240                         crq->valid = 0;
3241                         wmb();
3242                 }
3243 
3244                 vio_enable_interrupts(vdev);
3245                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3246                         vio_disable_interrupts(vdev);
3247                         ibmvfc_handle_async(async, vhost);
3248                         async->valid = 0;
3249                         wmb();
3250                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3251                         vio_disable_interrupts(vdev);
3252                         ibmvfc_handle_crq(crq, vhost);
3253                         crq->valid = 0;
3254                         wmb();
3255                 } else
3256                         done = 1;
3257         }
3258 
3259         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3260 }
3261 
3262 /**
3263  * ibmvfc_init_tgt - Set the next init job step for the target
3264  * @tgt:                ibmvfc target struct
3265  * @job_step:   job step to perform
3266  *
3267  **/
3268 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3269                             void (*job_step) (struct ibmvfc_target *))
3270 {
3271         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3272         tgt->job_step = job_step;
3273         wake_up(&tgt->vhost->work_wait_q);
3274 }
3275 
3276 /**
3277  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3278  * @tgt:                ibmvfc target struct
3279  * @job_step:   initialization job step
3280  *
3281  * Returns: 1 if step will be retried / 0 if not
3282  *
3283  **/
3284 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3285                                   void (*job_step) (struct ibmvfc_target *))
3286 {
3287         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3288                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3289                 wake_up(&tgt->vhost->work_wait_q);
3290                 return 0;
3291         } else
3292                 ibmvfc_init_tgt(tgt, job_step);
3293         return 1;
3294 }
3295 
3296 /* Defined in FC-LS */
3297 static const struct {
3298         int code;
3299         int retry;
3300         int logged_in;
3301 } prli_rsp [] = {
3302         { 0, 1, 0 },
3303         { 1, 0, 1 },
3304         { 2, 1, 0 },
3305         { 3, 1, 0 },
3306         { 4, 0, 0 },
3307         { 5, 0, 0 },
3308         { 6, 0, 1 },
3309         { 7, 0, 0 },
3310         { 8, 1, 0 },
3311 };
3312 
3313 /**
3314  * ibmvfc_get_prli_rsp - Find PRLI response index
3315  * @flags:      PRLI response flags
3316  *
3317  **/
3318 static int ibmvfc_get_prli_rsp(u16 flags)
3319 {
3320         int i;
3321         int code = (flags & 0x0f00) >> 8;
3322 
3323         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3324                 if (prli_rsp[i].code == code)
3325                         return i;
3326 
3327         return 0;
3328 }
3329 
3330 /**
3331  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3332  * @evt:        ibmvfc event struct
3333  *
3334  **/
3335 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3336 {
3337         struct ibmvfc_target *tgt = evt->tgt;
3338         struct ibmvfc_host *vhost = evt->vhost;
3339         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3340         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3341         u32 status = be16_to_cpu(rsp->common.status);
3342         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3343 
3344         vhost->discovery_threads--;
3345         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3346         switch (status) {
3347         case IBMVFC_MAD_SUCCESS:
3348                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3349                         parms->type, parms->flags, parms->service_parms);
3350 
3351                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3352                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3353                         if (prli_rsp[index].logged_in) {
3354                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3355                                         tgt->need_login = 0;
3356                                         tgt->ids.roles = 0;
3357                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3358                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3359                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3360                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3361                                         tgt->add_rport = 1;
3362                                 } else
3363                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3364                         } else if (prli_rsp[index].retry)
3365                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3366                         else
3367                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3368                 } else
3369                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3370                 break;
3371         case IBMVFC_MAD_DRIVER_FAILED:
3372                 break;
3373         case IBMVFC_MAD_CRQ_ERROR:
3374                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3375                 break;
3376         case IBMVFC_MAD_FAILED:
3377         default:
3378                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3379                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3380                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3381                 else if (tgt->logo_rcvd)
3382                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3383                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3384                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3385                 else
3386                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3387 
3388                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3389                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3390                         rsp->status, rsp->error, status);
3391                 break;
3392         };
3393 
3394         kref_put(&tgt->kref, ibmvfc_release_tgt);
3395         ibmvfc_free_event(evt);
3396         wake_up(&vhost->work_wait_q);
3397 }
3398 
3399 /**
3400  * ibmvfc_tgt_send_prli - Send a process login
3401  * @tgt:        ibmvfc target struct
3402  *
3403  **/
3404 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3405 {
3406         struct ibmvfc_process_login *prli;
3407         struct ibmvfc_host *vhost = tgt->vhost;
3408         struct ibmvfc_event *evt;
3409 
3410         if (vhost->discovery_threads >= disc_threads)
3411                 return;
3412 
3413         kref_get(&tgt->kref);
3414         evt = ibmvfc_get_event(vhost);
3415         vhost->discovery_threads++;
3416         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3417         evt->tgt = tgt;
3418         prli = &evt->iu.prli;
3419         memset(prli, 0, sizeof(*prli));
3420         prli->common.version = cpu_to_be32(1);
3421         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3422         prli->common.length = cpu_to_be16(sizeof(*prli));
3423         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3424 
3425         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3426         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3427         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3428 
3429         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3430         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3431                 vhost->discovery_threads--;
3432                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3433                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3434         } else
3435                 tgt_dbg(tgt, "Sent process login\n");
3436 }
3437 
3438 /**
3439  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3440  * @evt:        ibmvfc event struct
3441  *
3442  **/
3443 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3444 {
3445         struct ibmvfc_target *tgt = evt->tgt;
3446         struct ibmvfc_host *vhost = evt->vhost;
3447         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3448         u32 status = be16_to_cpu(rsp->common.status);
3449         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3450 
3451         vhost->discovery_threads--;
3452         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3453         switch (status) {
3454         case IBMVFC_MAD_SUCCESS:
3455                 tgt_dbg(tgt, "Port Login succeeded\n");
3456                 if (tgt->ids.port_name &&
3457                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3458                         vhost->reinit = 1;
3459                         tgt_dbg(tgt, "Port re-init required\n");
3460                         break;
3461                 }
3462                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3463                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3464                 tgt->ids.port_id = tgt->scsi_id;
3465                 memcpy(&tgt->service_parms, &rsp->service_parms,
3466                        sizeof(tgt->service_parms));
3467                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3468                        sizeof(tgt->service_parms_change));
3469                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3470                 break;
3471         case IBMVFC_MAD_DRIVER_FAILED:
3472                 break;
3473         case IBMVFC_MAD_CRQ_ERROR:
3474                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3475                 break;
3476         case IBMVFC_MAD_FAILED:
3477         default:
3478                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3479                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3480                 else
3481                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3482 
3483                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3484                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3485                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3486                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3487                 break;
3488         };
3489 
3490         kref_put(&tgt->kref, ibmvfc_release_tgt);
3491         ibmvfc_free_event(evt);
3492         wake_up(&vhost->work_wait_q);
3493 }
3494 
3495 /**
3496  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3497  * @tgt:        ibmvfc target struct
3498  *
3499  **/
3500 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3501 {
3502         struct ibmvfc_port_login *plogi;
3503         struct ibmvfc_host *vhost = tgt->vhost;
3504         struct ibmvfc_event *evt;
3505 
3506         if (vhost->discovery_threads >= disc_threads)
3507                 return;
3508 
3509         kref_get(&tgt->kref);
3510         tgt->logo_rcvd = 0;
3511         evt = ibmvfc_get_event(vhost);
3512         vhost->discovery_threads++;
3513         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3514         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3515         evt->tgt = tgt;
3516         plogi = &evt->iu.plogi;
3517         memset(plogi, 0, sizeof(*plogi));
3518         plogi->common.version = cpu_to_be32(1);
3519         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3520         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3521         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3522 
3523         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3524                 vhost->discovery_threads--;
3525                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3526                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3527         } else
3528                 tgt_dbg(tgt, "Sent port login\n");
3529 }
3530 
3531 /**
3532  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3533  * @evt:        ibmvfc event struct
3534  *
3535  **/
3536 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3537 {
3538         struct ibmvfc_target *tgt = evt->tgt;
3539         struct ibmvfc_host *vhost = evt->vhost;
3540         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3541         u32 status = be16_to_cpu(rsp->common.status);
3542 
3543         vhost->discovery_threads--;
3544         ibmvfc_free_event(evt);
3545         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3546 
3547         switch (status) {
3548         case IBMVFC_MAD_SUCCESS:
3549                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3550                 break;
3551         case IBMVFC_MAD_DRIVER_FAILED:
3552                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3553                 wake_up(&vhost->work_wait_q);
3554                 return;
3555         case IBMVFC_MAD_FAILED:
3556         default:
3557                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3558                 break;
3559         };
3560 
3561         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3562                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3563         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3564                  tgt->scsi_id != tgt->new_scsi_id)
3565                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3566         kref_put(&tgt->kref, ibmvfc_release_tgt);
3567         wake_up(&vhost->work_wait_q);
3568 }
3569 
3570 /**
3571  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3572  * @tgt:                ibmvfc target struct
3573  *
3574  **/
3575 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3576 {
3577         struct ibmvfc_implicit_logout *mad;
3578         struct ibmvfc_host *vhost = tgt->vhost;
3579         struct ibmvfc_event *evt;
3580 
3581         if (vhost->discovery_threads >= disc_threads)
3582                 return;
3583 
3584         kref_get(&tgt->kref);
3585         evt = ibmvfc_get_event(vhost);
3586         vhost->discovery_threads++;
3587         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3588         evt->tgt = tgt;
3589         mad = &evt->iu.implicit_logout;
3590         memset(mad, 0, sizeof(*mad));
3591         mad->common.version = cpu_to_be32(1);
3592         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3593         mad->common.length = cpu_to_be16(sizeof(*mad));
3594         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3595 
3596         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3597         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3598                 vhost->discovery_threads--;
3599                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3600                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3601         } else
3602                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3603 }
3604 
3605 /**
3606  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3607  * @mad:        ibmvfc passthru mad struct
3608  * @tgt:        ibmvfc target struct
3609  *
3610  * Returns:
3611  *      1 if PLOGI needed / 0 if PLOGI not needed
3612  **/
3613 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3614                                     struct ibmvfc_target *tgt)
3615 {
3616         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3617                    sizeof(tgt->ids.port_name)))
3618                 return 1;
3619         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3620                    sizeof(tgt->ids.node_name)))
3621                 return 1;
3622         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3623                 return 1;
3624         return 0;
3625 }
3626 
3627 /**
3628  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3629  * @evt:        ibmvfc event struct
3630  *
3631  **/
3632 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3633 {
3634         struct ibmvfc_target *tgt = evt->tgt;
3635         struct ibmvfc_host *vhost = evt->vhost;
3636         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3637         u32 status = be16_to_cpu(mad->common.status);
3638         u8 fc_reason, fc_explain;
3639 
3640         vhost->discovery_threads--;
3641         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3642         del_timer(&tgt->timer);
3643 
3644         switch (status) {
3645         case IBMVFC_MAD_SUCCESS:
3646                 tgt_dbg(tgt, "ADISC succeeded\n");
3647                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3648                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3649                 break;
3650         case IBMVFC_MAD_DRIVER_FAILED:
3651                 break;
3652         case IBMVFC_MAD_FAILED:
3653         default:
3654                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3655                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3656                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3657                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3658                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3659                          mad->iu.status, mad->iu.error,
3660                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3661                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3662                 break;
3663         };
3664 
3665         kref_put(&tgt->kref, ibmvfc_release_tgt);
3666         ibmvfc_free_event(evt);
3667         wake_up(&vhost->work_wait_q);
3668 }
3669 
3670 /**
3671  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3672  * @evt:                ibmvfc event struct
3673  *
3674  **/
3675 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3676 {
3677         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3678 
3679         memset(mad, 0, sizeof(*mad));
3680         mad->common.version = cpu_to_be32(1);
3681         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3682         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3683         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3684                 offsetof(struct ibmvfc_passthru_mad, iu));
3685         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3686         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3687         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3688         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3689                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3690                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3691         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3692         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3693                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3694                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3695         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3696 }
3697 
3698 /**
3699  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3700  * @evt:                ibmvfc event struct
3701  *
3702  * Just cleanup this event struct. Everything else is handled by
3703  * the ADISC completion handler. If the ADISC never actually comes
3704  * back, we still have the timer running on the ADISC event struct
3705  * which will fire and cause the CRQ to get reset.
3706  *
3707  **/
3708 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3709 {
3710         struct ibmvfc_host *vhost = evt->vhost;
3711         struct ibmvfc_target *tgt = evt->tgt;
3712 
3713         tgt_dbg(tgt, "ADISC cancel complete\n");
3714         vhost->abort_threads--;
3715         ibmvfc_free_event(evt);
3716         kref_put(&tgt->kref, ibmvfc_release_tgt);
3717         wake_up(&vhost->work_wait_q);
3718 }
3719 
3720 /**
3721  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3722  * @tgt:                ibmvfc target struct
3723  *
3724  * If an ADISC times out, send a cancel. If the cancel times
3725  * out, reset the CRQ. When the ADISC comes back as cancelled,
3726  * log back into the target.
3727  **/
3728 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3729 {
3730         struct ibmvfc_host *vhost = tgt->vhost;
3731         struct ibmvfc_event *evt;
3732         struct ibmvfc_tmf *tmf;
3733         unsigned long flags;
3734         int rc;
3735 
3736         tgt_dbg(tgt, "ADISC timeout\n");
3737         spin_lock_irqsave(vhost->host->host_lock, flags);
3738         if (vhost->abort_threads >= disc_threads ||
3739             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3740             vhost->state != IBMVFC_INITIALIZING ||
3741             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3742                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3743                 return;
3744         }
3745 
3746         vhost->abort_threads++;
3747         kref_get(&tgt->kref);
3748         evt = ibmvfc_get_event(vhost);
3749         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3750 
3751         evt->tgt = tgt;
3752         tmf = &evt->iu.tmf;
3753         memset(tmf, 0, sizeof(*tmf));
3754         tmf->common.version = cpu_to_be32(1);
3755         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3756         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3757         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3758         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3759 
3760         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3761 
3762         if (rc) {
3763                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3764                 vhost->abort_threads--;
3765                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3766                 __ibmvfc_reset_host(vhost);
3767         } else
3768                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3769         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3770 }
3771 
3772 /**
3773  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3774  * @tgt:                ibmvfc target struct
3775  *
3776  * When sending an ADISC we end up with two timers running. The
3777  * first timer is the timer in the ibmvfc target struct. If this
3778  * fires, we send a cancel to the target. The second timer is the
3779  * timer on the ibmvfc event for the ADISC, which is longer. If that
3780  * fires, it means the ADISC timed out and our attempt to cancel it
3781  * also failed, so we need to reset the CRQ.
3782  **/
3783 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3784 {
3785         struct ibmvfc_passthru_mad *mad;
3786         struct ibmvfc_host *vhost = tgt->vhost;
3787         struct ibmvfc_event *evt;
3788 
3789         if (vhost->discovery_threads >= disc_threads)
3790                 return;
3791 
3792         kref_get(&tgt->kref);
3793         evt = ibmvfc_get_event(vhost);
3794         vhost->discovery_threads++;
3795         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3796         evt->tgt = tgt;
3797 
3798         ibmvfc_init_passthru(evt);
3799         mad = &evt->iu.passthru;
3800         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3801         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3802         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3803 
3804         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3805         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3806                sizeof(vhost->login_buf->resp.port_name));
3807         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3808                sizeof(vhost->login_buf->resp.node_name));
3809         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3810 
3811         if (timer_pending(&tgt->timer))
3812                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3813         else {
3814                 tgt->timer.data = (unsigned long) tgt;
3815                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3816                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3817                 add_timer(&tgt->timer);
3818         }
3819 
3820         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3821         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3822                 vhost->discovery_threads--;
3823                 del_timer(&tgt->timer);
3824                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3825                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3826         } else
3827                 tgt_dbg(tgt, "Sent ADISC\n");
3828 }
3829 
3830 /**
3831  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3832  * @evt:        ibmvfc event struct
3833  *
3834  **/
3835 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3836 {
3837         struct ibmvfc_target *tgt = evt->tgt;
3838         struct ibmvfc_host *vhost = evt->vhost;
3839         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3840         u32 status = be16_to_cpu(rsp->common.status);
3841         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3842 
3843         vhost->discovery_threads--;
3844         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3845         switch (status) {
3846         case IBMVFC_MAD_SUCCESS:
3847                 tgt_dbg(tgt, "Query Target succeeded\n");
3848                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3849                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3850                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3851                 else
3852                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3853                 break;
3854         case IBMVFC_MAD_DRIVER_FAILED:
3855                 break;
3856         case IBMVFC_MAD_CRQ_ERROR:
3857                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3858                 break;
3859         case IBMVFC_MAD_FAILED:
3860         default:
3861                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3862                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3863                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3864                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3865                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3866                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3867                 else
3868                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3869 
3870                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3871                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3872                         rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3873                         rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3874                         rsp->fc_explain, status);
3875                 break;
3876         };
3877 
3878         kref_put(&tgt->kref, ibmvfc_release_tgt);
3879         ibmvfc_free_event(evt);
3880         wake_up(&vhost->work_wait_q);
3881 }
3882 
3883 /**
3884  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3885  * @tgt:        ibmvfc target struct
3886  *
3887  **/
3888 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3889 {
3890         struct ibmvfc_query_tgt *query_tgt;
3891         struct ibmvfc_host *vhost = tgt->vhost;
3892         struct ibmvfc_event *evt;
3893 
3894         if (vhost->discovery_threads >= disc_threads)
3895                 return;
3896 
3897         kref_get(&tgt->kref);
3898         evt = ibmvfc_get_event(vhost);
3899         vhost->discovery_threads++;
3900         evt->tgt = tgt;
3901         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3902         query_tgt = &evt->iu.query_tgt;
3903         memset(query_tgt, 0, sizeof(*query_tgt));
3904         query_tgt->common.version = cpu_to_be32(1);
3905         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3906         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3907         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3908 
3909         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3910         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3911                 vhost->discovery_threads--;
3912                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3913                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3914         } else
3915                 tgt_dbg(tgt, "Sent Query Target\n");
3916 }
3917 
3918 /**
3919  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3920  * @vhost:              ibmvfc host struct
3921  * @scsi_id:    SCSI ID to allocate target for
3922  *
3923  * Returns:
3924  *      0 on success / other on failure
3925  **/
3926 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3927 {
3928         struct ibmvfc_target *tgt;
3929         unsigned long flags;
3930 
3931         spin_lock_irqsave(vhost->host->host_lock, flags);
3932         list_for_each_entry(tgt, &vhost->targets, queue) {
3933                 if (tgt->scsi_id == scsi_id) {
3934                         if (tgt->need_login)
3935                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3936                         goto unlock_out;
3937                 }
3938         }
3939         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3940 
3941         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3942         if (!tgt) {
3943                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3944                         scsi_id);
3945                 return -ENOMEM;
3946         }
3947 
3948         memset(tgt, 0, sizeof(*tgt));
3949         tgt->scsi_id = scsi_id;
3950         tgt->new_scsi_id = scsi_id;
3951         tgt->vhost = vhost;
3952         tgt->need_login = 1;
3953         tgt->cancel_key = vhost->task_set++;
3954         init_timer(&tgt->timer);
3955         kref_init(&tgt->kref);
3956         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3957         spin_lock_irqsave(vhost->host->host_lock, flags);
3958         list_add_tail(&tgt->queue, &vhost->targets);
3959 
3960 unlock_out:
3961         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3962         return 0;
3963 }
3964 
3965 /**
3966  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3967  * @vhost:              ibmvfc host struct
3968  *
3969  * Returns:
3970  *      0 on success / other on failure
3971  **/
3972 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3973 {
3974         int i, rc;
3975 
3976         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3977                 rc = ibmvfc_alloc_target(vhost,
3978                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3979                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3980 
3981         return rc;
3982 }
3983 
3984 /**
3985  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3986  * @evt:        ibmvfc event struct
3987  *
3988  **/
3989 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3990 {
3991         struct ibmvfc_host *vhost = evt->vhost;
3992         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3993         u32 mad_status = be16_to_cpu(rsp->common.status);
3994         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3995 
3996         switch (mad_status) {
3997         case IBMVFC_MAD_SUCCESS:
3998                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3999                 vhost->num_targets = be32_to_cpu(rsp->num_written);
4000                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4001                 break;
4002         case IBMVFC_MAD_FAILED:
4003                 level += ibmvfc_retry_host_init(vhost);
4004                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4005                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4006                            rsp->status, rsp->error);
4007                 break;
4008         case IBMVFC_MAD_DRIVER_FAILED:
4009                 break;
4010         default:
4011                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4012                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4013                 break;
4014         }
4015 
4016         ibmvfc_free_event(evt);
4017         wake_up(&vhost->work_wait_q);
4018 }
4019 
4020 /**
4021  * ibmvfc_discover_targets - Send Discover Targets MAD
4022  * @vhost:      ibmvfc host struct
4023  *
4024  **/
4025 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4026 {
4027         struct ibmvfc_discover_targets *mad;
4028         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4029 
4030         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
4031         mad = &evt->iu.discover_targets;
4032         memset(mad, 0, sizeof(*mad));
4033         mad->common.version = cpu_to_be32(1);
4034         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
4035         mad->common.length = cpu_to_be16(sizeof(*mad));
4036         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
4037         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
4038         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
4039         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4040 
4041         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4042                 ibmvfc_dbg(vhost, "Sent discover targets\n");
4043         else
4044                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4045 }
4046 
4047 /**
4048  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4049  * @evt:        ibmvfc event struct
4050  *
4051  **/
4052 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4053 {
4054         struct ibmvfc_host *vhost = evt->vhost;
4055         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4056         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4057         unsigned int npiv_max_sectors;
4058         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4059 
4060         switch (mad_status) {
4061         case IBMVFC_MAD_SUCCESS:
4062                 ibmvfc_free_event(evt);
4063                 break;
4064         case IBMVFC_MAD_FAILED:
4065                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4066                         level += ibmvfc_retry_host_init(vhost);
4067                 else
4068                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4069                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4070                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4071                                                 rsp->status, rsp->error);
4072                 ibmvfc_free_event(evt);
4073                 return;
4074         case IBMVFC_MAD_CRQ_ERROR:
4075                 ibmvfc_retry_host_init(vhost);
4076         case IBMVFC_MAD_DRIVER_FAILED:
4077                 ibmvfc_free_event(evt);
4078                 return;
4079         default:
4080                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4081                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4082                 ibmvfc_free_event(evt);
4083                 return;
4084         }
4085 
4086         vhost->client_migrated = 0;
4087 
4088         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4089                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4090                         rsp->flags);
4091                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4092                 wake_up(&vhost->work_wait_q);
4093                 return;
4094         }
4095 
4096         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4097                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4098                         rsp->max_cmds);
4099                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4100                 wake_up(&vhost->work_wait_q);
4101                 return;
4102         }
4103 
4104         vhost->logged_in = 1;
4105         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4106         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4107                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4108                  rsp->drc_name, npiv_max_sectors);
4109 
4110         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4111         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4112         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4113         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4114         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4115         fc_host_supported_classes(vhost->host) = 0;
4116         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4117                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4118         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4119                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4120         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4121                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4122         fc_host_maxframe_size(vhost->host) =
4123                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4124 
4125         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4126         vhost->host->max_sectors = npiv_max_sectors;
4127         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4128         wake_up(&vhost->work_wait_q);
4129 }
4130 
4131 /**
4132  * ibmvfc_npiv_login - Sends NPIV login
4133  * @vhost:      ibmvfc host struct
4134  *
4135  **/
4136 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4137 {
4138         struct ibmvfc_npiv_login_mad *mad;
4139         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4140 
4141         ibmvfc_gather_partition_info(vhost);
4142         ibmvfc_set_login_info(vhost);
4143         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4144 
4145         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4146         mad = &evt->iu.npiv_login;
4147         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4148         mad->common.version = cpu_to_be32(1);
4149         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4150         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4151         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4152         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4153 
4154         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4155 
4156         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4157                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4158         else
4159                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4160 };
4161 
4162 /**
4163  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4164  * @vhost:              ibmvfc host struct
4165  *
4166  **/
4167 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4168 {
4169         struct ibmvfc_host *vhost = evt->vhost;
4170         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4171 
4172         ibmvfc_free_event(evt);
4173 
4174         switch (mad_status) {
4175         case IBMVFC_MAD_SUCCESS:
4176                 if (list_empty(&vhost->sent) &&
4177                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4178                         ibmvfc_init_host(vhost);
4179                         return;
4180                 }
4181                 break;
4182         case IBMVFC_MAD_FAILED:
4183         case IBMVFC_MAD_NOT_SUPPORTED:
4184         case IBMVFC_MAD_CRQ_ERROR:
4185         case IBMVFC_MAD_DRIVER_FAILED:
4186         default:
4187                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4188                 break;
4189         }
4190 
4191         ibmvfc_hard_reset_host(vhost);
4192 }
4193 
4194 /**
4195  * ibmvfc_npiv_logout - Issue an NPIV Logout
4196  * @vhost:              ibmvfc host struct
4197  *
4198  **/
4199 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4200 {
4201         struct ibmvfc_npiv_logout_mad *mad;
4202         struct ibmvfc_event *evt;
4203 
4204         evt = ibmvfc_get_event(vhost);
4205         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4206 
4207         mad = &evt->iu.npiv_logout;
4208         memset(mad, 0, sizeof(*mad));
4209         mad->common.version = cpu_to_be32(1);
4210         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4211         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4212 
4213         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4214 
4215         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4216                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4217         else
4218                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4219 }
4220 
4221 /**
4222  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4223  * @vhost:              ibmvfc host struct
4224  *
4225  * Returns:
4226  *      1 if work to do / 0 if not
4227  **/
4228 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4229 {
4230         struct ibmvfc_target *tgt;
4231 
4232         list_for_each_entry(tgt, &vhost->targets, queue) {
4233                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4234                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4235                         return 1;
4236         }
4237 
4238         return 0;
4239 }
4240 
4241 /**
4242  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4243  * @vhost:              ibmvfc host struct
4244  *
4245  * Returns:
4246  *      1 if work to do / 0 if not
4247  **/
4248 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4249 {
4250         struct ibmvfc_target *tgt;
4251 
4252         if (kthread_should_stop())
4253                 return 1;
4254         switch (vhost->action) {
4255         case IBMVFC_HOST_ACTION_NONE:
4256         case IBMVFC_HOST_ACTION_INIT_WAIT:
4257         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4258                 return 0;
4259         case IBMVFC_HOST_ACTION_TGT_INIT:
4260         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4261                 if (vhost->discovery_threads == disc_threads)
4262                         return 0;
4263                 list_for_each_entry(tgt, &vhost->targets, queue)
4264                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4265                                 return 1;
4266                 list_for_each_entry(tgt, &vhost->targets, queue)
4267                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4268                                 return 0;
4269                 return 1;
4270         case IBMVFC_HOST_ACTION_LOGO:
4271         case IBMVFC_HOST_ACTION_INIT:
4272         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4273         case IBMVFC_HOST_ACTION_TGT_DEL:
4274         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4275         case IBMVFC_HOST_ACTION_QUERY:
4276         case IBMVFC_HOST_ACTION_RESET:
4277         case IBMVFC_HOST_ACTION_REENABLE:
4278         default:
4279                 break;
4280         };
4281 
4282         return 1;
4283 }
4284 
4285 /**
4286  * ibmvfc_work_to_do - Is there task level work to do?
4287  * @vhost:              ibmvfc host struct
4288  *
4289  * Returns:
4290  *      1 if work to do / 0 if not
4291  **/
4292 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4293 {
4294         unsigned long flags;
4295         int rc;
4296 
4297         spin_lock_irqsave(vhost->host->host_lock, flags);
4298         rc = __ibmvfc_work_to_do(vhost);
4299         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4300         return rc;
4301 }
4302 
4303 /**
4304  * ibmvfc_log_ae - Log async events if necessary
4305  * @vhost:              ibmvfc host struct
4306  * @events:             events to log
4307  *
4308  **/
4309 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4310 {
4311         if (events & IBMVFC_AE_RSCN)
4312                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4313         if ((events & IBMVFC_AE_LINKDOWN) &&
4314             vhost->state >= IBMVFC_HALTED)
4315                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4316         if ((events & IBMVFC_AE_LINKUP) &&
4317             vhost->state == IBMVFC_INITIALIZING)
4318                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4319 }
4320 
4321 /**
4322  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4323  * @tgt:                ibmvfc target struct
4324  *
4325  **/
4326 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4327 {
4328         struct ibmvfc_host *vhost = tgt->vhost;
4329         struct fc_rport *rport;
4330         unsigned long flags;
4331 
4332         tgt_dbg(tgt, "Adding rport\n");
4333         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4334         spin_lock_irqsave(vhost->host->host_lock, flags);
4335 
4336         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4337                 tgt_dbg(tgt, "Deleting rport\n");
4338                 list_del(&tgt->queue);
4339                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4340                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4341                 fc_remote_port_delete(rport);
4342                 del_timer_sync(&tgt->timer);
4343                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4344                 return;
4345         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4346                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4347                 return;
4348         }
4349 
4350         if (rport) {
4351                 tgt_dbg(tgt, "rport add succeeded\n");
4352                 tgt->rport = rport;
4353                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4354                 rport->supported_classes = 0;
4355                 tgt->target_id = rport->scsi_target_id;
4356                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4357                         rport->supported_classes |= FC_COS_CLASS1;
4358                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4359                         rport->supported_classes |= FC_COS_CLASS2;
4360                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4361                         rport->supported_classes |= FC_COS_CLASS3;
4362                 if (rport->rqst_q)
4363                         blk_queue_max_segments(rport->rqst_q, 1);
4364         } else
4365                 tgt_dbg(tgt, "rport add failed\n");
4366         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4367 }
4368 
4369 /**
4370  * ibmvfc_do_work - Do task level work
4371  * @vhost:              ibmvfc host struct
4372  *
4373  **/
4374 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4375 {
4376         struct ibmvfc_target *tgt;
4377         unsigned long flags;
4378         struct fc_rport *rport;
4379         int rc;
4380 
4381         ibmvfc_log_ae(vhost, vhost->events_to_log);
4382         spin_lock_irqsave(vhost->host->host_lock, flags);
4383         vhost->events_to_log = 0;
4384         switch (vhost->action) {
4385         case IBMVFC_HOST_ACTION_NONE:
4386         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4387         case IBMVFC_HOST_ACTION_INIT_WAIT:
4388                 break;
4389         case IBMVFC_HOST_ACTION_RESET:
4390                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4391                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4392                 rc = ibmvfc_reset_crq(vhost);
4393                 spin_lock_irqsave(vhost->host->host_lock, flags);
4394                 if (rc == H_CLOSED)
4395                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4396                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4397                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4398                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4399                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4400                 }
4401                 break;
4402         case IBMVFC_HOST_ACTION_REENABLE:
4403                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4404                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4405                 rc = ibmvfc_reenable_crq_queue(vhost);
4406                 spin_lock_irqsave(vhost->host->host_lock, flags);
4407                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4408                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4409                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4410                 }
4411                 break;
4412         case IBMVFC_HOST_ACTION_LOGO:
4413                 vhost->job_step(vhost);
4414                 break;
4415         case IBMVFC_HOST_ACTION_INIT:
4416                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4417                 if (vhost->delay_init) {
4418                         vhost->delay_init = 0;
4419                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4420                         ssleep(15);
4421                         return;
4422                 } else
4423                         vhost->job_step(vhost);
4424                 break;
4425         case IBMVFC_HOST_ACTION_QUERY:
4426                 list_for_each_entry(tgt, &vhost->targets, queue)
4427                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4428                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4429                 break;
4430         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4431                 list_for_each_entry(tgt, &vhost->targets, queue) {
4432                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4433                                 tgt->job_step(tgt);
4434                                 break;
4435                         }
4436                 }
4437 
4438                 if (!ibmvfc_dev_init_to_do(vhost))
4439                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4440                 break;
4441         case IBMVFC_HOST_ACTION_TGT_DEL:
4442         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4443                 list_for_each_entry(tgt, &vhost->targets, queue) {
4444                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4445                                 tgt_dbg(tgt, "Deleting rport\n");
4446                                 rport = tgt->rport;
4447                                 tgt->rport = NULL;
4448                                 list_del(&tgt->queue);
4449                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4450                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4451                                 if (rport)
4452                                         fc_remote_port_delete(rport);
4453                                 del_timer_sync(&tgt->timer);
4454                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4455                                 return;
4456                         }
4457                 }
4458 
4459                 if (vhost->state == IBMVFC_INITIALIZING) {
4460                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4461                                 if (vhost->reinit) {
4462                                         vhost->reinit = 0;
4463                                         scsi_block_requests(vhost->host);
4464                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4465                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4466                                 } else {
4467                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4468                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4469                                         wake_up(&vhost->init_wait_q);
4470                                         schedule_work(&vhost->rport_add_work_q);
4471                                         vhost->init_retries = 0;
4472                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4473                                         scsi_unblock_requests(vhost->host);
4474                                 }
4475 
4476                                 return;
4477                         } else {
4478                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4479                                 vhost->job_step = ibmvfc_discover_targets;
4480                         }
4481                 } else {
4482                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4483                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4484                         scsi_unblock_requests(vhost->host);
4485                         wake_up(&vhost->init_wait_q);
4486                         return;
4487                 }
4488                 break;
4489         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4490                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4491                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4492                 ibmvfc_alloc_targets(vhost);
4493                 spin_lock_irqsave(vhost->host->host_lock, flags);
4494                 break;
4495         case IBMVFC_HOST_ACTION_TGT_INIT:
4496                 list_for_each_entry(tgt, &vhost->targets, queue) {
4497                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4498                                 tgt->job_step(tgt);
4499                                 break;
4500                         }
4501                 }
4502 
4503                 if (!ibmvfc_dev_init_to_do(vhost))
4504                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4505                 break;
4506         default:
4507                 break;
4508         };
4509 
4510         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4511 }
4512 
4513 /**
4514  * ibmvfc_work - Do task level work
4515  * @data:               ibmvfc host struct
4516  *
4517  * Returns:
4518  *      zero
4519  **/
4520 static int ibmvfc_work(void *data)
4521 {
4522         struct ibmvfc_host *vhost = data;
4523         int rc;
4524 
4525         set_user_nice(current, MIN_NICE);
4526 
4527         while (1) {
4528                 rc = wait_event_interruptible(vhost->work_wait_q,
4529                                               ibmvfc_work_to_do(vhost));
4530 
4531                 BUG_ON(rc);
4532 
4533                 if (kthread_should_stop())
4534                         break;
4535 
4536                 ibmvfc_do_work(vhost);
4537         }
4538 
4539         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4540         return 0;
4541 }
4542 
4543 /**
4544  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4545  * @vhost:      ibmvfc host struct
4546  *
4547  * Allocates a page for messages, maps it for dma, and registers
4548  * the crq with the hypervisor.
4549  *
4550  * Return value:
4551  *      zero on success / other on failure
4552  **/
4553 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4554 {
4555         int rc, retrc = -ENOMEM;
4556         struct device *dev = vhost->dev;
4557         struct vio_dev *vdev = to_vio_dev(dev);
4558         struct ibmvfc_crq_queue *crq = &vhost->crq;
4559 
4560         ENTER;
4561         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4562 
4563         if (!crq->msgs)
4564                 return -ENOMEM;
4565 
4566         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4567         crq->msg_token = dma_map_single(dev, crq->msgs,
4568                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4569 
4570         if (dma_mapping_error(dev, crq->msg_token))
4571                 goto map_failed;
4572 
4573         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4574                                         crq->msg_token, PAGE_SIZE);
4575 
4576         if (rc == H_RESOURCE)
4577                 /* maybe kexecing and resource is busy. try a reset */
4578                 retrc = rc = ibmvfc_reset_crq(vhost);
4579 
4580         if (rc == H_CLOSED)
4581                 dev_warn(dev, "Partner adapter not ready\n");
4582         else if (rc) {
4583                 dev_warn(dev, "Error %d opening adapter\n", rc);
4584                 goto reg_crq_failed;
4585         }
4586 
4587         retrc = 0;
4588 
4589         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4590 
4591         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4592                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4593                 goto req_irq_failed;
4594         }
4595 
4596         if ((rc = vio_enable_interrupts(vdev))) {
4597                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4598                 goto req_irq_failed;
4599         }
4600 
4601         crq->cur = 0;
4602         LEAVE;
4603         return retrc;
4604 
4605 req_irq_failed:
4606         tasklet_kill(&vhost->tasklet);
4607         do {
4608                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4609         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4610 reg_crq_failed:
4611         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4612 map_failed:
4613         free_page((unsigned long)crq->msgs);
4614         return retrc;
4615 }
4616 
4617 /**
4618  * ibmvfc_free_mem - Free memory for vhost
4619  * @vhost:      ibmvfc host struct
4620  *
4621  * Return value:
4622  *      none
4623  **/
4624 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4625 {
4626         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4627 
4628         ENTER;
4629         mempool_destroy(vhost->tgt_pool);
4630         kfree(vhost->trace);
4631         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4632                           vhost->disc_buf_dma);
4633         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4634                           vhost->login_buf, vhost->login_buf_dma);
4635         dma_pool_destroy(vhost->sg_pool);
4636         dma_unmap_single(vhost->dev, async_q->msg_token,
4637                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4638         free_page((unsigned long)async_q->msgs);
4639         LEAVE;
4640 }
4641 
4642 /**
4643  * ibmvfc_alloc_mem - Allocate memory for vhost
4644  * @vhost:      ibmvfc host struct
4645  *
4646  * Return value:
4647  *      0 on success / non-zero on failure
4648  **/
4649 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4650 {
4651         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4652         struct device *dev = vhost->dev;
4653 
4654         ENTER;
4655         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4656         if (!async_q->msgs) {
4657                 dev_err(dev, "Couldn't allocate async queue.\n");
4658                 goto nomem;
4659         }
4660 
4661         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4662         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4663                                             async_q->size * sizeof(*async_q->msgs),
4664                                             DMA_BIDIRECTIONAL);
4665 
4666         if (dma_mapping_error(dev, async_q->msg_token)) {
4667                 dev_err(dev, "Failed to map async queue\n");
4668                 goto free_async_crq;
4669         }
4670 
4671         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4672                                          SG_ALL * sizeof(struct srp_direct_buf),
4673                                          sizeof(struct srp_direct_buf), 0);
4674 
4675         if (!vhost->sg_pool) {
4676                 dev_err(dev, "Failed to allocate sg pool\n");
4677                 goto unmap_async_crq;
4678         }
4679 
4680         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4681                                               &vhost->login_buf_dma, GFP_KERNEL);
4682 
4683         if (!vhost->login_buf) {
4684                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4685                 goto free_sg_pool;
4686         }
4687 
4688         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4689         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4690                                              &vhost->disc_buf_dma, GFP_KERNEL);
4691 
4692         if (!vhost->disc_buf) {
4693                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4694                 goto free_login_buffer;
4695         }
4696 
4697         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4698                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4699 
4700         if (!vhost->trace)
4701                 goto free_disc_buffer;
4702 
4703         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4704                                                       sizeof(struct ibmvfc_target));
4705 
4706         if (!vhost->tgt_pool) {
4707                 dev_err(dev, "Couldn't allocate target memory pool\n");
4708                 goto free_trace;
4709         }
4710 
4711         LEAVE;
4712         return 0;
4713 
4714 free_trace:
4715         kfree(vhost->trace);
4716 free_disc_buffer:
4717         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4718                           vhost->disc_buf_dma);
4719 free_login_buffer:
4720         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4721                           vhost->login_buf, vhost->login_buf_dma);
4722 free_sg_pool:
4723         dma_pool_destroy(vhost->sg_pool);
4724 unmap_async_crq:
4725         dma_unmap_single(dev, async_q->msg_token,
4726                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4727 free_async_crq:
4728         free_page((unsigned long)async_q->msgs);
4729 nomem:
4730         LEAVE;
4731         return -ENOMEM;
4732 }
4733 
4734 /**
4735  * ibmvfc_rport_add_thread - Worker thread for rport adds
4736  * @work:       work struct
4737  *
4738  **/
4739 static void ibmvfc_rport_add_thread(struct work_struct *work)
4740 {
4741         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4742                                                  rport_add_work_q);
4743         struct ibmvfc_target *tgt;
4744         struct fc_rport *rport;
4745         unsigned long flags;
4746         int did_work;
4747 
4748         ENTER;
4749         spin_lock_irqsave(vhost->host->host_lock, flags);
4750         do {
4751                 did_work = 0;
4752                 if (vhost->state != IBMVFC_ACTIVE)
4753                         break;
4754 
4755                 list_for_each_entry(tgt, &vhost->targets, queue) {
4756                         if (tgt->add_rport) {
4757                                 did_work = 1;
4758                                 tgt->add_rport = 0;
4759                                 kref_get(&tgt->kref);
4760                                 rport = tgt->rport;
4761                                 if (!rport) {
4762                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4763                                         ibmvfc_tgt_add_rport(tgt);
4764                                 } else if (get_device(&rport->dev)) {
4765                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4766                                         tgt_dbg(tgt, "Setting rport roles\n");
4767                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4768                                         put_device(&rport->dev);
4769                                 }
4770 
4771                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4772                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4773                                 break;
4774                         }
4775                 }
4776         } while(did_work);
4777 
4778         if (vhost->state == IBMVFC_ACTIVE)
4779                 vhost->scan_complete = 1;
4780         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4781         LEAVE;
4782 }
4783 
4784 /**
4785  * ibmvfc_probe - Adapter hot plug add entry point
4786  * @vdev:       vio device struct
4787  * @id: vio device id struct
4788  *
4789  * Return value:
4790  *      0 on success / non-zero on failure
4791  **/
4792 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4793 {
4794         struct ibmvfc_host *vhost;
4795         struct Scsi_Host *shost;
4796         struct device *dev = &vdev->dev;
4797         int rc = -ENOMEM;
4798 
4799         ENTER;
4800         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4801         if (!shost) {
4802                 dev_err(dev, "Couldn't allocate host data\n");
4803                 goto out;
4804         }
4805 
4806         shost->transportt = ibmvfc_transport_template;
4807         shost->can_queue = max_requests;
4808         shost->max_lun = max_lun;
4809         shost->max_id = max_targets;
4810         shost->max_sectors = IBMVFC_MAX_SECTORS;
4811         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4812         shost->unique_id = shost->host_no;
4813 
4814         vhost = shost_priv(shost);
4815         INIT_LIST_HEAD(&vhost->sent);
4816         INIT_LIST_HEAD(&vhost->free);
4817         INIT_LIST_HEAD(&vhost->targets);
4818         sprintf(vhost->name, IBMVFC_NAME);
4819         vhost->host = shost;
4820         vhost->dev = dev;
4821         vhost->partition_number = -1;
4822         vhost->log_level = log_level;
4823         vhost->task_set = 1;
4824         strcpy(vhost->partition_name, "UNKNOWN");
4825         init_waitqueue_head(&vhost->work_wait_q);
4826         init_waitqueue_head(&vhost->init_wait_q);
4827         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4828         mutex_init(&vhost->passthru_mutex);
4829 
4830         if ((rc = ibmvfc_alloc_mem(vhost)))
4831                 goto free_scsi_host;
4832 
4833         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4834                                          shost->host_no);
4835 
4836         if (IS_ERR(vhost->work_thread)) {
4837                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4838                         PTR_ERR(vhost->work_thread));
4839                 goto free_host_mem;
4840         }
4841 
4842         if ((rc = ibmvfc_init_crq(vhost))) {
4843                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4844                 goto kill_kthread;
4845         }
4846 
4847         if ((rc = ibmvfc_init_event_pool(vhost))) {
4848                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4849                 goto release_crq;
4850         }
4851 
4852         if ((rc = scsi_add_host(shost, dev)))
4853                 goto release_event_pool;
4854 
4855         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4856 
4857         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4858                                            &ibmvfc_trace_attr))) {
4859                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4860                 goto remove_shost;
4861         }
4862 
4863         if (shost_to_fc_host(shost)->rqst_q)
4864                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4865         dev_set_drvdata(dev, vhost);
4866         spin_lock(&ibmvfc_driver_lock);
4867         list_add_tail(&vhost->queue, &ibmvfc_head);
4868         spin_unlock(&ibmvfc_driver_lock);
4869 
4870         ibmvfc_send_crq_init(vhost);
4871         scsi_scan_host(shost);
4872         return 0;
4873 
4874 remove_shost:
4875         scsi_remove_host(shost);
4876 release_event_pool:
4877         ibmvfc_free_event_pool(vhost);
4878 release_crq:
4879         ibmvfc_release_crq_queue(vhost);
4880 kill_kthread:
4881         kthread_stop(vhost->work_thread);
4882 free_host_mem:
4883         ibmvfc_free_mem(vhost);
4884 free_scsi_host:
4885         scsi_host_put(shost);
4886 out:
4887         LEAVE;
4888         return rc;
4889 }
4890 
4891 /**
4892  * ibmvfc_remove - Adapter hot plug remove entry point
4893  * @vdev:       vio device struct
4894  *
4895  * Return value:
4896  *      0
4897  **/
4898 static int ibmvfc_remove(struct vio_dev *vdev)
4899 {
4900         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4901         unsigned long flags;
4902 
4903         ENTER;
4904         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4905 
4906         spin_lock_irqsave(vhost->host->host_lock, flags);
4907         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4908         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4909 
4910         ibmvfc_wait_while_resetting(vhost);
4911         ibmvfc_release_crq_queue(vhost);
4912         kthread_stop(vhost->work_thread);
4913         fc_remove_host(vhost->host);
4914         scsi_remove_host(vhost->host);
4915 
4916         spin_lock_irqsave(vhost->host->host_lock, flags);
4917         ibmvfc_purge_requests(vhost, DID_ERROR);
4918         ibmvfc_free_event_pool(vhost);
4919         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4920 
4921         ibmvfc_free_mem(vhost);
4922         spin_lock(&ibmvfc_driver_lock);
4923         list_del(&vhost->queue);
4924         spin_unlock(&ibmvfc_driver_lock);
4925         scsi_host_put(vhost->host);
4926         LEAVE;
4927         return 0;
4928 }
4929 
4930 /**
4931  * ibmvfc_resume - Resume from suspend
4932  * @dev:        device struct
4933  *
4934  * We may have lost an interrupt across suspend/resume, so kick the
4935  * interrupt handler
4936  *
4937  */
4938 static int ibmvfc_resume(struct device *dev)
4939 {
4940         unsigned long flags;
4941         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4942         struct vio_dev *vdev = to_vio_dev(dev);
4943 
4944         spin_lock_irqsave(vhost->host->host_lock, flags);
4945         vio_disable_interrupts(vdev);
4946         tasklet_schedule(&vhost->tasklet);
4947         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4948         return 0;
4949 }
4950 
4951 /**
4952  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4953  * @vdev:       vio device struct
4954  *
4955  * Return value:
4956  *      Number of bytes the driver will need to DMA map at the same time in
4957  *      order to perform well.
4958  */
4959 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4960 {
4961         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4962         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4963 }
4964 
4965 static struct vio_device_id ibmvfc_device_table[] = {
4966         {"fcp", "IBM,vfc-client"},
4967         { "", "" }
4968 };
4969 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4970 
4971 static struct dev_pm_ops ibmvfc_pm_ops = {
4972         .resume = ibmvfc_resume
4973 };
4974 
4975 static struct vio_driver ibmvfc_driver = {
4976         .id_table = ibmvfc_device_table,
4977         .probe = ibmvfc_probe,
4978         .remove = ibmvfc_remove,
4979         .get_desired_dma = ibmvfc_get_desired_dma,
4980         .name = IBMVFC_NAME,
4981         .pm = &ibmvfc_pm_ops,
4982 };
4983 
4984 static struct fc_function_template ibmvfc_transport_functions = {
4985         .show_host_fabric_name = 1,
4986         .show_host_node_name = 1,
4987         .show_host_port_name = 1,
4988         .show_host_supported_classes = 1,
4989         .show_host_port_type = 1,
4990         .show_host_port_id = 1,
4991         .show_host_maxframe_size = 1,
4992 
4993         .get_host_port_state = ibmvfc_get_host_port_state,
4994         .show_host_port_state = 1,
4995 
4996         .get_host_speed = ibmvfc_get_host_speed,
4997         .show_host_speed = 1,
4998 
4999         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
5000         .terminate_rport_io = ibmvfc_terminate_rport_io,
5001 
5002         .show_rport_maxframe_size = 1,
5003         .show_rport_supported_classes = 1,
5004 
5005         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
5006         .show_rport_dev_loss_tmo = 1,
5007 
5008         .get_starget_node_name = ibmvfc_get_starget_node_name,
5009         .show_starget_node_name = 1,
5010 
5011         .get_starget_port_name = ibmvfc_get_starget_port_name,
5012         .show_starget_port_name = 1,
5013 
5014         .get_starget_port_id = ibmvfc_get_starget_port_id,
5015         .show_starget_port_id = 1,
5016 
5017         .bsg_request = ibmvfc_bsg_request,
5018         .bsg_timeout = ibmvfc_bsg_timeout,
5019 };
5020 
5021 /**
5022  * ibmvfc_module_init - Initialize the ibmvfc module
5023  *
5024  * Return value:
5025  *      0 on success / other on failure
5026  **/
5027 static int __init ibmvfc_module_init(void)
5028 {
5029         int rc;
5030 
5031         if (!firmware_has_feature(FW_FEATURE_VIO))
5032                 return -ENODEV;
5033 
5034         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
5035                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
5036 
5037         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
5038         if (!ibmvfc_transport_template)
5039                 return -ENOMEM;
5040 
5041         rc = vio_register_driver(&ibmvfc_driver);
5042         if (rc)
5043                 fc_release_transport(ibmvfc_transport_template);
5044         return rc;
5045 }
5046 
5047 /**
5048  * ibmvfc_module_exit - Teardown the ibmvfc module
5049  *
5050  * Return value:
5051  *      nothing
5052  **/
5053 static void __exit ibmvfc_module_exit(void)
5054 {
5055         vio_unregister_driver(&ibmvfc_driver);
5056         fc_release_transport(ibmvfc_transport_template);
5057 }
5058 
5059 module_init(ibmvfc_module_init);
5060 module_exit(ibmvfc_module_exit);
5061 

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