Version:  2.0.40 2.2.26 2.4.37 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 3.18 3.19 4.0

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         int rc;
1619 
1620         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1621             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1622                 cmnd->result = rc;
1623                 done(cmnd);
1624                 return 0;
1625         }
1626 
1627         cmnd->result = (DID_OK << 16);
1628         evt = ibmvfc_get_event(vhost);
1629         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1630         evt->cmnd = cmnd;
1631         cmnd->scsi_done = done;
1632         vfc_cmd = &evt->iu.cmd;
1633         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1634         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1635         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1636         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1637         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1638         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1639         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1640         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1641         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1642         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1643         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1644 
1645         if (cmnd->flags & SCMD_TAGGED) {
1646                 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1647                 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1648         }
1649 
1650         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1651                 return ibmvfc_send_event(evt, vhost, 0);
1652 
1653         ibmvfc_free_event(evt);
1654         if (rc == -ENOMEM)
1655                 return SCSI_MLQUEUE_HOST_BUSY;
1656 
1657         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1658                 scmd_printk(KERN_ERR, cmnd,
1659                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1660 
1661         cmnd->result = DID_ERROR << 16;
1662         done(cmnd);
1663         return 0;
1664 }
1665 
1666 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1667 
1668 /**
1669  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1670  * @evt:        ibmvfc event struct
1671  *
1672  **/
1673 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1674 {
1675         /* copy the response back */
1676         if (evt->sync_iu)
1677                 *evt->sync_iu = *evt->xfer_iu;
1678 
1679         complete(&evt->comp);
1680 }
1681 
1682 /**
1683  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1684  * @evt:        struct ibmvfc_event
1685  *
1686  **/
1687 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1688 {
1689         struct ibmvfc_host *vhost = evt->vhost;
1690 
1691         ibmvfc_free_event(evt);
1692         vhost->aborting_passthru = 0;
1693         dev_info(vhost->dev, "Passthru command cancelled\n");
1694 }
1695 
1696 /**
1697  * ibmvfc_bsg_timeout - Handle a BSG timeout
1698  * @job:        struct fc_bsg_job that timed out
1699  *
1700  * Returns:
1701  *      0 on success / other on failure
1702  **/
1703 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1704 {
1705         struct ibmvfc_host *vhost = shost_priv(job->shost);
1706         unsigned long port_id = (unsigned long)job->dd_data;
1707         struct ibmvfc_event *evt;
1708         struct ibmvfc_tmf *tmf;
1709         unsigned long flags;
1710         int rc;
1711 
1712         ENTER;
1713         spin_lock_irqsave(vhost->host->host_lock, flags);
1714         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1715                 __ibmvfc_reset_host(vhost);
1716                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1717                 return 0;
1718         }
1719 
1720         vhost->aborting_passthru = 1;
1721         evt = ibmvfc_get_event(vhost);
1722         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1723 
1724         tmf = &evt->iu.tmf;
1725         memset(tmf, 0, sizeof(*tmf));
1726         tmf->common.version = cpu_to_be32(1);
1727         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1728         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1729         tmf->scsi_id = cpu_to_be64(port_id);
1730         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1731         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1732         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1733 
1734         if (rc != 0) {
1735                 vhost->aborting_passthru = 0;
1736                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1737                 rc = -EIO;
1738         } else
1739                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1740                          port_id);
1741 
1742         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1743 
1744         LEAVE;
1745         return rc;
1746 }
1747 
1748 /**
1749  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1750  * @vhost:              struct ibmvfc_host to send command
1751  * @port_id:    port ID to send command
1752  *
1753  * Returns:
1754  *      0 on success / other on failure
1755  **/
1756 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1757 {
1758         struct ibmvfc_port_login *plogi;
1759         struct ibmvfc_target *tgt;
1760         struct ibmvfc_event *evt;
1761         union ibmvfc_iu rsp_iu;
1762         unsigned long flags;
1763         int rc = 0, issue_login = 1;
1764 
1765         ENTER;
1766         spin_lock_irqsave(vhost->host->host_lock, flags);
1767         list_for_each_entry(tgt, &vhost->targets, queue) {
1768                 if (tgt->scsi_id == port_id) {
1769                         issue_login = 0;
1770                         break;
1771                 }
1772         }
1773 
1774         if (!issue_login)
1775                 goto unlock_out;
1776         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1777                 goto unlock_out;
1778 
1779         evt = ibmvfc_get_event(vhost);
1780         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1781         plogi = &evt->iu.plogi;
1782         memset(plogi, 0, sizeof(*plogi));
1783         plogi->common.version = cpu_to_be32(1);
1784         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1785         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1786         plogi->scsi_id = cpu_to_be64(port_id);
1787         evt->sync_iu = &rsp_iu;
1788         init_completion(&evt->comp);
1789 
1790         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1791         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1792 
1793         if (rc)
1794                 return -EIO;
1795 
1796         wait_for_completion(&evt->comp);
1797 
1798         if (rsp_iu.plogi.common.status)
1799                 rc = -EIO;
1800 
1801         spin_lock_irqsave(vhost->host->host_lock, flags);
1802         ibmvfc_free_event(evt);
1803 unlock_out:
1804         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1805         LEAVE;
1806         return rc;
1807 }
1808 
1809 /**
1810  * ibmvfc_bsg_request - Handle a BSG request
1811  * @job:        struct fc_bsg_job to be executed
1812  *
1813  * Returns:
1814  *      0 on success / other on failure
1815  **/
1816 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1817 {
1818         struct ibmvfc_host *vhost = shost_priv(job->shost);
1819         struct fc_rport *rport = job->rport;
1820         struct ibmvfc_passthru_mad *mad;
1821         struct ibmvfc_event *evt;
1822         union ibmvfc_iu rsp_iu;
1823         unsigned long flags, port_id = -1;
1824         unsigned int code = job->request->msgcode;
1825         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1826         u32 fc_flags, rsp_len;
1827 
1828         ENTER;
1829         job->reply->reply_payload_rcv_len = 0;
1830         if (rport)
1831                 port_id = rport->port_id;
1832 
1833         switch (code) {
1834         case FC_BSG_HST_ELS_NOLOGIN:
1835                 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1836                         (job->request->rqst_data.h_els.port_id[1] << 8) |
1837                         job->request->rqst_data.h_els.port_id[2];
1838         case FC_BSG_RPT_ELS:
1839                 fc_flags = IBMVFC_FC_ELS;
1840                 break;
1841         case FC_BSG_HST_CT:
1842                 issue_login = 1;
1843                 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1844                         (job->request->rqst_data.h_ct.port_id[1] << 8) |
1845                         job->request->rqst_data.h_ct.port_id[2];
1846         case FC_BSG_RPT_CT:
1847                 fc_flags = IBMVFC_FC_CT_IU;
1848                 break;
1849         default:
1850                 return -ENOTSUPP;
1851         };
1852 
1853         if (port_id == -1)
1854                 return -EINVAL;
1855         if (!mutex_trylock(&vhost->passthru_mutex))
1856                 return -EBUSY;
1857 
1858         job->dd_data = (void *)port_id;
1859         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1860                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1861 
1862         if (!req_seg) {
1863                 mutex_unlock(&vhost->passthru_mutex);
1864                 return -ENOMEM;
1865         }
1866 
1867         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1868                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1869 
1870         if (!rsp_seg) {
1871                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1872                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1873                 mutex_unlock(&vhost->passthru_mutex);
1874                 return -ENOMEM;
1875         }
1876 
1877         if (req_seg > 1 || rsp_seg > 1) {
1878                 rc = -EINVAL;
1879                 goto out;
1880         }
1881 
1882         if (issue_login)
1883                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1884 
1885         spin_lock_irqsave(vhost->host->host_lock, flags);
1886 
1887         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1888             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1889                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1890                 goto out;
1891         }
1892 
1893         evt = ibmvfc_get_event(vhost);
1894         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1895         mad = &evt->iu.passthru;
1896 
1897         memset(mad, 0, sizeof(*mad));
1898         mad->common.version = cpu_to_be32(1);
1899         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1900         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1901 
1902         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1903                 offsetof(struct ibmvfc_passthru_mad, iu));
1904         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1905 
1906         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1907         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1908         mad->iu.flags = cpu_to_be32(fc_flags);
1909         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1910 
1911         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1912         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1913         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1914         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1915         mad->iu.scsi_id = cpu_to_be64(port_id);
1916         mad->iu.tag = cpu_to_be64((u64)evt);
1917         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1918 
1919         evt->sync_iu = &rsp_iu;
1920         init_completion(&evt->comp);
1921         rc = ibmvfc_send_event(evt, vhost, 0);
1922         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1923 
1924         if (rc) {
1925                 rc = -EIO;
1926                 goto out;
1927         }
1928 
1929         wait_for_completion(&evt->comp);
1930 
1931         if (rsp_iu.passthru.common.status)
1932                 rc = -EIO;
1933         else
1934                 job->reply->reply_payload_rcv_len = rsp_len;
1935 
1936         spin_lock_irqsave(vhost->host->host_lock, flags);
1937         ibmvfc_free_event(evt);
1938         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1939         job->reply->result = rc;
1940         job->job_done(job);
1941         rc = 0;
1942 out:
1943         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1944                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1945         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1946                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1947         mutex_unlock(&vhost->passthru_mutex);
1948         LEAVE;
1949         return rc;
1950 }
1951 
1952 /**
1953  * ibmvfc_reset_device - Reset the device with the specified reset type
1954  * @sdev:       scsi device to reset
1955  * @type:       reset type
1956  * @desc:       reset type description for log messages
1957  *
1958  * Returns:
1959  *      0 on success / other on failure
1960  **/
1961 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1962 {
1963         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1964         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1965         struct ibmvfc_cmd *tmf;
1966         struct ibmvfc_event *evt = NULL;
1967         union ibmvfc_iu rsp_iu;
1968         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1969         int rsp_rc = -EBUSY;
1970         unsigned long flags;
1971         int rsp_code = 0;
1972 
1973         spin_lock_irqsave(vhost->host->host_lock, flags);
1974         if (vhost->state == IBMVFC_ACTIVE) {
1975                 evt = ibmvfc_get_event(vhost);
1976                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1977 
1978                 tmf = &evt->iu.cmd;
1979                 memset(tmf, 0, sizeof(*tmf));
1980                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1981                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1982                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1983                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1984                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1985                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1986                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1987                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1988                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1989                 tmf->iu.tmf_flags = type;
1990                 evt->sync_iu = &rsp_iu;
1991 
1992                 init_completion(&evt->comp);
1993                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
1994         }
1995         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1996 
1997         if (rsp_rc != 0) {
1998                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
1999                             desc, rsp_rc);
2000                 return -EIO;
2001         }
2002 
2003         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2004         wait_for_completion(&evt->comp);
2005 
2006         if (rsp_iu.cmd.status)
2007                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2008 
2009         if (rsp_code) {
2010                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2011                         rsp_code = fc_rsp->data.info.rsp_code;
2012 
2013                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2014                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2015                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2016                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2017                             fc_rsp->scsi_status);
2018                 rsp_rc = -EIO;
2019         } else
2020                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2021 
2022         spin_lock_irqsave(vhost->host->host_lock, flags);
2023         ibmvfc_free_event(evt);
2024         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2025         return rsp_rc;
2026 }
2027 
2028 /**
2029  * ibmvfc_match_rport - Match function for specified remote port
2030  * @evt:        ibmvfc event struct
2031  * @device:     device to match (rport)
2032  *
2033  * Returns:
2034  *      1 if event matches rport / 0 if event does not match rport
2035  **/
2036 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2037 {
2038         struct fc_rport *cmd_rport;
2039 
2040         if (evt->cmnd) {
2041                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2042                 if (cmd_rport == rport)
2043                         return 1;
2044         }
2045         return 0;
2046 }
2047 
2048 /**
2049  * ibmvfc_match_target - Match function for specified target
2050  * @evt:        ibmvfc event struct
2051  * @device:     device to match (starget)
2052  *
2053  * Returns:
2054  *      1 if event matches starget / 0 if event does not match starget
2055  **/
2056 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2057 {
2058         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2059                 return 1;
2060         return 0;
2061 }
2062 
2063 /**
2064  * ibmvfc_match_lun - Match function for specified LUN
2065  * @evt:        ibmvfc event struct
2066  * @device:     device to match (sdev)
2067  *
2068  * Returns:
2069  *      1 if event matches sdev / 0 if event does not match sdev
2070  **/
2071 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2072 {
2073         if (evt->cmnd && evt->cmnd->device == device)
2074                 return 1;
2075         return 0;
2076 }
2077 
2078 /**
2079  * ibmvfc_wait_for_ops - Wait for ops to complete
2080  * @vhost:      ibmvfc host struct
2081  * @device:     device to match (starget or sdev)
2082  * @match:      match function
2083  *
2084  * Returns:
2085  *      SUCCESS / FAILED
2086  **/
2087 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2088                                int (*match) (struct ibmvfc_event *, void *))
2089 {
2090         struct ibmvfc_event *evt;
2091         DECLARE_COMPLETION_ONSTACK(comp);
2092         int wait;
2093         unsigned long flags;
2094         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2095 
2096         ENTER;
2097         do {
2098                 wait = 0;
2099                 spin_lock_irqsave(vhost->host->host_lock, flags);
2100                 list_for_each_entry(evt, &vhost->sent, queue) {
2101                         if (match(evt, device)) {
2102                                 evt->eh_comp = &comp;
2103                                 wait++;
2104                         }
2105                 }
2106                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2107 
2108                 if (wait) {
2109                         timeout = wait_for_completion_timeout(&comp, timeout);
2110 
2111                         if (!timeout) {
2112                                 wait = 0;
2113                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2114                                 list_for_each_entry(evt, &vhost->sent, queue) {
2115                                         if (match(evt, device)) {
2116                                                 evt->eh_comp = NULL;
2117                                                 wait++;
2118                                         }
2119                                 }
2120                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2121                                 if (wait)
2122                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2123                                 LEAVE;
2124                                 return wait ? FAILED : SUCCESS;
2125                         }
2126                 }
2127         } while (wait);
2128 
2129         LEAVE;
2130         return SUCCESS;
2131 }
2132 
2133 /**
2134  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2135  * @sdev:       scsi device to cancel commands
2136  * @type:       type of error recovery being performed
2137  *
2138  * This sends a cancel to the VIOS for the specified device. This does
2139  * NOT send any abort to the actual device. That must be done separately.
2140  *
2141  * Returns:
2142  *      0 on success / other on failure
2143  **/
2144 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2145 {
2146         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2147         struct scsi_target *starget = scsi_target(sdev);
2148         struct fc_rport *rport = starget_to_rport(starget);
2149         struct ibmvfc_tmf *tmf;
2150         struct ibmvfc_event *evt, *found_evt;
2151         union ibmvfc_iu rsp;
2152         int rsp_rc = -EBUSY;
2153         unsigned long flags;
2154         u16 status;
2155 
2156         ENTER;
2157         spin_lock_irqsave(vhost->host->host_lock, flags);
2158         found_evt = NULL;
2159         list_for_each_entry(evt, &vhost->sent, queue) {
2160                 if (evt->cmnd && evt->cmnd->device == sdev) {
2161                         found_evt = evt;
2162                         break;
2163                 }
2164         }
2165 
2166         if (!found_evt) {
2167                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2168                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2169                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2170                 return 0;
2171         }
2172 
2173         if (vhost->logged_in) {
2174                 evt = ibmvfc_get_event(vhost);
2175                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2176 
2177                 tmf = &evt->iu.tmf;
2178                 memset(tmf, 0, sizeof(*tmf));
2179                 tmf->common.version = cpu_to_be32(1);
2180                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2181                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2182                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2183                 int_to_scsilun(sdev->lun, &tmf->lun);
2184                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2185                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2186                 if (vhost->state == IBMVFC_ACTIVE)
2187                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2188                 else
2189                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2190                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2191                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2192 
2193                 evt->sync_iu = &rsp;
2194                 init_completion(&evt->comp);
2195                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2196         }
2197 
2198         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2199 
2200         if (rsp_rc != 0) {
2201                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2202                 /* If failure is received, the host adapter is most likely going
2203                  through reset, return success so the caller will wait for the command
2204                  being cancelled to get returned */
2205                 return 0;
2206         }
2207 
2208         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2209 
2210         wait_for_completion(&evt->comp);
2211         status = be16_to_cpu(rsp.mad_common.status);
2212         spin_lock_irqsave(vhost->host->host_lock, flags);
2213         ibmvfc_free_event(evt);
2214         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2215 
2216         if (status != IBMVFC_MAD_SUCCESS) {
2217                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2218                 switch (status) {
2219                 case IBMVFC_MAD_DRIVER_FAILED:
2220                 case IBMVFC_MAD_CRQ_ERROR:
2221                         /* Host adapter most likely going through reset, return success to
2222                          the caller will wait for the command being cancelled to get returned */
2223                         return 0;
2224                 default:
2225                         return -EIO;
2226                 };
2227         }
2228 
2229         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2230         return 0;
2231 }
2232 
2233 /**
2234  * ibmvfc_match_key - Match function for specified cancel key
2235  * @evt:        ibmvfc event struct
2236  * @key:        cancel key to match
2237  *
2238  * Returns:
2239  *      1 if event matches key / 0 if event does not match key
2240  **/
2241 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2242 {
2243         unsigned long cancel_key = (unsigned long)key;
2244 
2245         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2246             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2247                 return 1;
2248         return 0;
2249 }
2250 
2251 /**
2252  * ibmvfc_match_evt - Match function for specified event
2253  * @evt:        ibmvfc event struct
2254  * @match:      event to match
2255  *
2256  * Returns:
2257  *      1 if event matches key / 0 if event does not match key
2258  **/
2259 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2260 {
2261         if (evt == match)
2262                 return 1;
2263         return 0;
2264 }
2265 
2266 /**
2267  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2268  * @sdev:       scsi device to abort commands
2269  *
2270  * This sends an Abort Task Set to the VIOS for the specified device. This does
2271  * NOT send any cancel to the VIOS. That must be done separately.
2272  *
2273  * Returns:
2274  *      0 on success / other on failure
2275  **/
2276 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2277 {
2278         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2279         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2280         struct ibmvfc_cmd *tmf;
2281         struct ibmvfc_event *evt, *found_evt;
2282         union ibmvfc_iu rsp_iu;
2283         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2284         int rc, rsp_rc = -EBUSY;
2285         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2286         int rsp_code = 0;
2287 
2288         spin_lock_irqsave(vhost->host->host_lock, flags);
2289         found_evt = NULL;
2290         list_for_each_entry(evt, &vhost->sent, queue) {
2291                 if (evt->cmnd && evt->cmnd->device == sdev) {
2292                         found_evt = evt;
2293                         break;
2294                 }
2295         }
2296 
2297         if (!found_evt) {
2298                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2299                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2300                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2301                 return 0;
2302         }
2303 
2304         if (vhost->state == IBMVFC_ACTIVE) {
2305                 evt = ibmvfc_get_event(vhost);
2306                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2307 
2308                 tmf = &evt->iu.cmd;
2309                 memset(tmf, 0, sizeof(*tmf));
2310                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2311                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2312                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2313                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2314                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2315                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2316                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2317                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2318                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2319                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2320                 evt->sync_iu = &rsp_iu;
2321 
2322                 init_completion(&evt->comp);
2323                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2324         }
2325 
2326         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2327 
2328         if (rsp_rc != 0) {
2329                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2330                 return -EIO;
2331         }
2332 
2333         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2334         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2335 
2336         if (!timeout) {
2337                 rc = ibmvfc_cancel_all(sdev, 0);
2338                 if (!rc) {
2339                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2340                         if (rc == SUCCESS)
2341                                 rc = 0;
2342                 }
2343 
2344                 if (rc) {
2345                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2346                         ibmvfc_reset_host(vhost);
2347                         rsp_rc = -EIO;
2348                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2349 
2350                         if (rc == SUCCESS)
2351                                 rsp_rc = 0;
2352 
2353                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2354                         if (rc != SUCCESS) {
2355                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2356                                 ibmvfc_hard_reset_host(vhost);
2357                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2358                                 rsp_rc = 0;
2359                         }
2360 
2361                         goto out;
2362                 }
2363         }
2364 
2365         if (rsp_iu.cmd.status)
2366                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2367 
2368         if (rsp_code) {
2369                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2370                         rsp_code = fc_rsp->data.info.rsp_code;
2371 
2372                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2373                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2374                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2375                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2376                             fc_rsp->scsi_status);
2377                 rsp_rc = -EIO;
2378         } else
2379                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2380 
2381 out:
2382         spin_lock_irqsave(vhost->host->host_lock, flags);
2383         ibmvfc_free_event(evt);
2384         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2385         return rsp_rc;
2386 }
2387 
2388 /**
2389  * ibmvfc_eh_abort_handler - Abort a command
2390  * @cmd:        scsi command to abort
2391  *
2392  * Returns:
2393  *      SUCCESS / FAST_IO_FAIL / FAILED
2394  **/
2395 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2396 {
2397         struct scsi_device *sdev = cmd->device;
2398         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2399         int cancel_rc, block_rc;
2400         int rc = FAILED;
2401 
2402         ENTER;
2403         block_rc = fc_block_scsi_eh(cmd);
2404         ibmvfc_wait_while_resetting(vhost);
2405         if (block_rc != FAST_IO_FAIL) {
2406                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2407                 ibmvfc_abort_task_set(sdev);
2408         } else
2409                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2410 
2411         if (!cancel_rc)
2412                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2413 
2414         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2415                 rc = FAST_IO_FAIL;
2416 
2417         LEAVE;
2418         return rc;
2419 }
2420 
2421 /**
2422  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2423  * @cmd:        scsi command struct
2424  *
2425  * Returns:
2426  *      SUCCESS / FAST_IO_FAIL / FAILED
2427  **/
2428 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2429 {
2430         struct scsi_device *sdev = cmd->device;
2431         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2432         int cancel_rc, block_rc, reset_rc = 0;
2433         int rc = FAILED;
2434 
2435         ENTER;
2436         block_rc = fc_block_scsi_eh(cmd);
2437         ibmvfc_wait_while_resetting(vhost);
2438         if (block_rc != FAST_IO_FAIL) {
2439                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2440                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2441         } else
2442                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2443 
2444         if (!cancel_rc && !reset_rc)
2445                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2446 
2447         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2448                 rc = FAST_IO_FAIL;
2449 
2450         LEAVE;
2451         return rc;
2452 }
2453 
2454 /**
2455  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2456  * @sdev:       scsi device struct
2457  * @data:       return code
2458  *
2459  **/
2460 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2461 {
2462         unsigned long *rc = data;
2463         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2464 }
2465 
2466 /**
2467  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2468  * @sdev:       scsi device struct
2469  * @data:       return code
2470  *
2471  **/
2472 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2473 {
2474         unsigned long *rc = data;
2475         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2476 }
2477 
2478 /**
2479  * ibmvfc_eh_target_reset_handler - Reset the target
2480  * @cmd:        scsi command struct
2481  *
2482  * Returns:
2483  *      SUCCESS / FAST_IO_FAIL / FAILED
2484  **/
2485 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2486 {
2487         struct scsi_device *sdev = cmd->device;
2488         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2489         struct scsi_target *starget = scsi_target(sdev);
2490         int block_rc;
2491         int reset_rc = 0;
2492         int rc = FAILED;
2493         unsigned long cancel_rc = 0;
2494 
2495         ENTER;
2496         block_rc = fc_block_scsi_eh(cmd);
2497         ibmvfc_wait_while_resetting(vhost);
2498         if (block_rc != FAST_IO_FAIL) {
2499                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2500                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2501         } else
2502                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2503 
2504         if (!cancel_rc && !reset_rc)
2505                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2506 
2507         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2508                 rc = FAST_IO_FAIL;
2509 
2510         LEAVE;
2511         return rc;
2512 }
2513 
2514 /**
2515  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2516  * @cmd:        struct scsi_cmnd having problems
2517  *
2518  **/
2519 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2520 {
2521         int rc, block_rc;
2522         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2523 
2524         block_rc = fc_block_scsi_eh(cmd);
2525         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2526         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2527 
2528         if (block_rc == FAST_IO_FAIL)
2529                 return FAST_IO_FAIL;
2530 
2531         return rc ? FAILED : SUCCESS;
2532 }
2533 
2534 /**
2535  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2536  * @rport:              rport struct
2537  *
2538  * Return value:
2539  *      none
2540  **/
2541 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2542 {
2543         struct Scsi_Host *shost = rport_to_shost(rport);
2544         struct ibmvfc_host *vhost = shost_priv(shost);
2545         struct fc_rport *dev_rport;
2546         struct scsi_device *sdev;
2547         unsigned long rc;
2548 
2549         ENTER;
2550         shost_for_each_device(sdev, shost) {
2551                 dev_rport = starget_to_rport(scsi_target(sdev));
2552                 if (dev_rport != rport)
2553                         continue;
2554                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2555         }
2556 
2557         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2558 
2559         if (rc == FAILED)
2560                 ibmvfc_issue_fc_host_lip(shost);
2561         LEAVE;
2562 }
2563 
2564 static const struct ibmvfc_async_desc ae_desc [] = {
2565         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2566         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2567         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2568         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2569         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2570         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2571         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2572         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2573         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2574         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2575         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2576         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2577         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2578 };
2579 
2580 static const struct ibmvfc_async_desc unknown_ae = {
2581         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2582 };
2583 
2584 /**
2585  * ibmvfc_get_ae_desc - Get text description for async event
2586  * @ae: async event
2587  *
2588  **/
2589 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2590 {
2591         int i;
2592 
2593         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2594                 if (ae_desc[i].ae == ae)
2595                         return &ae_desc[i];
2596 
2597         return &unknown_ae;
2598 }
2599 
2600 static const struct {
2601         enum ibmvfc_ae_link_state state;
2602         const char *desc;
2603 } link_desc [] = {
2604         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2605         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2606         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2607         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2608 };
2609 
2610 /**
2611  * ibmvfc_get_link_state - Get text description for link state
2612  * @state:      link state
2613  *
2614  **/
2615 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2616 {
2617         int i;
2618 
2619         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2620                 if (link_desc[i].state == state)
2621                         return link_desc[i].desc;
2622 
2623         return "";
2624 }
2625 
2626 /**
2627  * ibmvfc_handle_async - Handle an async event from the adapter
2628  * @crq:        crq to process
2629  * @vhost:      ibmvfc host struct
2630  *
2631  **/
2632 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2633                                 struct ibmvfc_host *vhost)
2634 {
2635         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2636         struct ibmvfc_target *tgt;
2637 
2638         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2639                    " node_name: %llx%s\n", desc->desc, crq->scsi_id, crq->wwpn, crq->node_name,
2640                    ibmvfc_get_link_state(crq->link_state));
2641 
2642         switch (be64_to_cpu(crq->event)) {
2643         case IBMVFC_AE_RESUME:
2644                 switch (crq->link_state) {
2645                 case IBMVFC_AE_LS_LINK_DOWN:
2646                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2647                         break;
2648                 case IBMVFC_AE_LS_LINK_DEAD:
2649                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2650                         break;
2651                 case IBMVFC_AE_LS_LINK_UP:
2652                 case IBMVFC_AE_LS_LINK_BOUNCED:
2653                 default:
2654                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2655                         vhost->delay_init = 1;
2656                         __ibmvfc_reset_host(vhost);
2657                         break;
2658                 };
2659 
2660                 break;
2661         case IBMVFC_AE_LINK_UP:
2662                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2663                 vhost->delay_init = 1;
2664                 __ibmvfc_reset_host(vhost);
2665                 break;
2666         case IBMVFC_AE_SCN_FABRIC:
2667         case IBMVFC_AE_SCN_DOMAIN:
2668                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2669                 if (vhost->state < IBMVFC_HALTED) {
2670                         vhost->delay_init = 1;
2671                         __ibmvfc_reset_host(vhost);
2672                 }
2673                 break;
2674         case IBMVFC_AE_SCN_NPORT:
2675         case IBMVFC_AE_SCN_GROUP:
2676                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2677                 ibmvfc_reinit_host(vhost);
2678                 break;
2679         case IBMVFC_AE_ELS_LOGO:
2680         case IBMVFC_AE_ELS_PRLO:
2681         case IBMVFC_AE_ELS_PLOGI:
2682                 list_for_each_entry(tgt, &vhost->targets, queue) {
2683                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2684                                 break;
2685                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2686                                 continue;
2687                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2688                                 continue;
2689                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2690                                 continue;
2691                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2692                                 tgt->logo_rcvd = 1;
2693                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2694                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2695                                 ibmvfc_reinit_host(vhost);
2696                         }
2697                 }
2698                 break;
2699         case IBMVFC_AE_LINK_DOWN:
2700         case IBMVFC_AE_ADAPTER_FAILED:
2701                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2702                 break;
2703         case IBMVFC_AE_LINK_DEAD:
2704                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2705                 break;
2706         case IBMVFC_AE_HALT:
2707                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2708                 break;
2709         default:
2710                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2711                 break;
2712         };
2713 }
2714 
2715 /**
2716  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2717  * @crq:        Command/Response queue
2718  * @vhost:      ibmvfc host struct
2719  *
2720  **/
2721 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2722 {
2723         long rc;
2724         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2725 
2726         switch (crq->valid) {
2727         case IBMVFC_CRQ_INIT_RSP:
2728                 switch (crq->format) {
2729                 case IBMVFC_CRQ_INIT:
2730                         dev_info(vhost->dev, "Partner initialized\n");
2731                         /* Send back a response */
2732                         rc = ibmvfc_send_crq_init_complete(vhost);
2733                         if (rc == 0)
2734                                 ibmvfc_init_host(vhost);
2735                         else
2736                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2737                         break;
2738                 case IBMVFC_CRQ_INIT_COMPLETE:
2739                         dev_info(vhost->dev, "Partner initialization complete\n");
2740                         ibmvfc_init_host(vhost);
2741                         break;
2742                 default:
2743                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2744                 }
2745                 return;
2746         case IBMVFC_CRQ_XPORT_EVENT:
2747                 vhost->state = IBMVFC_NO_CRQ;
2748                 vhost->logged_in = 0;
2749                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2750                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2751                         /* We need to re-setup the interpartition connection */
2752                         dev_info(vhost->dev, "Re-enabling adapter\n");
2753                         vhost->client_migrated = 1;
2754                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2755                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2756                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2757                 } else {
2758                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2759                         ibmvfc_purge_requests(vhost, DID_ERROR);
2760                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2761                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2762                 }
2763                 return;
2764         case IBMVFC_CRQ_CMD_RSP:
2765                 break;
2766         default:
2767                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2768                 return;
2769         }
2770 
2771         if (crq->format == IBMVFC_ASYNC_EVENT)
2772                 return;
2773 
2774         /* The only kind of payload CRQs we should get are responses to
2775          * things we send. Make sure this response is to something we
2776          * actually sent
2777          */
2778         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2779                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2780                         crq->ioba);
2781                 return;
2782         }
2783 
2784         if (unlikely(atomic_read(&evt->free))) {
2785                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2786                         crq->ioba);
2787                 return;
2788         }
2789 
2790         del_timer(&evt->timer);
2791         list_del(&evt->queue);
2792         ibmvfc_trc_end(evt);
2793         evt->done(evt);
2794 }
2795 
2796 /**
2797  * ibmvfc_scan_finished - Check if the device scan is done.
2798  * @shost:      scsi host struct
2799  * @time:       current elapsed time
2800  *
2801  * Returns:
2802  *      0 if scan is not done / 1 if scan is done
2803  **/
2804 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2805 {
2806         unsigned long flags;
2807         struct ibmvfc_host *vhost = shost_priv(shost);
2808         int done = 0;
2809 
2810         spin_lock_irqsave(shost->host_lock, flags);
2811         if (time >= (init_timeout * HZ)) {
2812                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2813                          "continuing initialization\n", init_timeout);
2814                 done = 1;
2815         }
2816 
2817         if (vhost->scan_complete)
2818                 done = 1;
2819         spin_unlock_irqrestore(shost->host_lock, flags);
2820         return done;
2821 }
2822 
2823 /**
2824  * ibmvfc_slave_alloc - Setup the device's task set value
2825  * @sdev:       struct scsi_device device to configure
2826  *
2827  * Set the device's task set value so that error handling works as
2828  * expected.
2829  *
2830  * Returns:
2831  *      0 on success / -ENXIO if device does not exist
2832  **/
2833 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2834 {
2835         struct Scsi_Host *shost = sdev->host;
2836         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2837         struct ibmvfc_host *vhost = shost_priv(shost);
2838         unsigned long flags = 0;
2839 
2840         if (!rport || fc_remote_port_chkready(rport))
2841                 return -ENXIO;
2842 
2843         spin_lock_irqsave(shost->host_lock, flags);
2844         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2845         spin_unlock_irqrestore(shost->host_lock, flags);
2846         return 0;
2847 }
2848 
2849 /**
2850  * ibmvfc_target_alloc - Setup the target's task set value
2851  * @starget:    struct scsi_target
2852  *
2853  * Set the target's task set value so that error handling works as
2854  * expected.
2855  *
2856  * Returns:
2857  *      0 on success / -ENXIO if device does not exist
2858  **/
2859 static int ibmvfc_target_alloc(struct scsi_target *starget)
2860 {
2861         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2862         struct ibmvfc_host *vhost = shost_priv(shost);
2863         unsigned long flags = 0;
2864 
2865         spin_lock_irqsave(shost->host_lock, flags);
2866         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2867         spin_unlock_irqrestore(shost->host_lock, flags);
2868         return 0;
2869 }
2870 
2871 /**
2872  * ibmvfc_slave_configure - Configure the device
2873  * @sdev:       struct scsi_device device to configure
2874  *
2875  * Enable allow_restart for a device if it is a disk. Adjust the
2876  * queue_depth here also.
2877  *
2878  * Returns:
2879  *      0
2880  **/
2881 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2882 {
2883         struct Scsi_Host *shost = sdev->host;
2884         unsigned long flags = 0;
2885 
2886         spin_lock_irqsave(shost->host_lock, flags);
2887         if (sdev->type == TYPE_DISK)
2888                 sdev->allow_restart = 1;
2889         spin_unlock_irqrestore(shost->host_lock, flags);
2890         return 0;
2891 }
2892 
2893 /**
2894  * ibmvfc_change_queue_depth - Change the device's queue depth
2895  * @sdev:       scsi device struct
2896  * @qdepth:     depth to set
2897  * @reason:     calling context
2898  *
2899  * Return value:
2900  *      actual depth set
2901  **/
2902 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2903 {
2904         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2905                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2906 
2907         return scsi_change_queue_depth(sdev, qdepth);
2908 }
2909 
2910 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2911                                                  struct device_attribute *attr, char *buf)
2912 {
2913         struct Scsi_Host *shost = class_to_shost(dev);
2914         struct ibmvfc_host *vhost = shost_priv(shost);
2915 
2916         return snprintf(buf, PAGE_SIZE, "%s\n",
2917                         vhost->login_buf->resp.partition_name);
2918 }
2919 
2920 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2921                                             struct device_attribute *attr, char *buf)
2922 {
2923         struct Scsi_Host *shost = class_to_shost(dev);
2924         struct ibmvfc_host *vhost = shost_priv(shost);
2925 
2926         return snprintf(buf, PAGE_SIZE, "%s\n",
2927                         vhost->login_buf->resp.device_name);
2928 }
2929 
2930 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2931                                          struct device_attribute *attr, char *buf)
2932 {
2933         struct Scsi_Host *shost = class_to_shost(dev);
2934         struct ibmvfc_host *vhost = shost_priv(shost);
2935 
2936         return snprintf(buf, PAGE_SIZE, "%s\n",
2937                         vhost->login_buf->resp.port_loc_code);
2938 }
2939 
2940 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2941                                          struct device_attribute *attr, char *buf)
2942 {
2943         struct Scsi_Host *shost = class_to_shost(dev);
2944         struct ibmvfc_host *vhost = shost_priv(shost);
2945 
2946         return snprintf(buf, PAGE_SIZE, "%s\n",
2947                         vhost->login_buf->resp.drc_name);
2948 }
2949 
2950 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2951                                              struct device_attribute *attr, char *buf)
2952 {
2953         struct Scsi_Host *shost = class_to_shost(dev);
2954         struct ibmvfc_host *vhost = shost_priv(shost);
2955         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2956 }
2957 
2958 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2959                                              struct device_attribute *attr, char *buf)
2960 {
2961         struct Scsi_Host *shost = class_to_shost(dev);
2962         struct ibmvfc_host *vhost = shost_priv(shost);
2963         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2964 }
2965 
2966 /**
2967  * ibmvfc_show_log_level - Show the adapter's error logging level
2968  * @dev:        class device struct
2969  * @buf:        buffer
2970  *
2971  * Return value:
2972  *      number of bytes printed to buffer
2973  **/
2974 static ssize_t ibmvfc_show_log_level(struct device *dev,
2975                                      struct device_attribute *attr, char *buf)
2976 {
2977         struct Scsi_Host *shost = class_to_shost(dev);
2978         struct ibmvfc_host *vhost = shost_priv(shost);
2979         unsigned long flags = 0;
2980         int len;
2981 
2982         spin_lock_irqsave(shost->host_lock, flags);
2983         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2984         spin_unlock_irqrestore(shost->host_lock, flags);
2985         return len;
2986 }
2987 
2988 /**
2989  * ibmvfc_store_log_level - Change the adapter's error logging level
2990  * @dev:        class device struct
2991  * @buf:        buffer
2992  *
2993  * Return value:
2994  *      number of bytes printed to buffer
2995  **/
2996 static ssize_t ibmvfc_store_log_level(struct device *dev,
2997                                       struct device_attribute *attr,
2998                                       const char *buf, size_t count)
2999 {
3000         struct Scsi_Host *shost = class_to_shost(dev);
3001         struct ibmvfc_host *vhost = shost_priv(shost);
3002         unsigned long flags = 0;
3003 
3004         spin_lock_irqsave(shost->host_lock, flags);
3005         vhost->log_level = simple_strtoul(buf, NULL, 10);
3006         spin_unlock_irqrestore(shost->host_lock, flags);
3007         return strlen(buf);
3008 }
3009 
3010 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3011 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3012 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3013 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3014 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3015 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3016 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3017                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3018 
3019 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3020 /**
3021  * ibmvfc_read_trace - Dump the adapter trace
3022  * @filp:               open sysfs file
3023  * @kobj:               kobject struct
3024  * @bin_attr:   bin_attribute struct
3025  * @buf:                buffer
3026  * @off:                offset
3027  * @count:              buffer size
3028  *
3029  * Return value:
3030  *      number of bytes printed to buffer
3031  **/
3032 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3033                                  struct bin_attribute *bin_attr,
3034                                  char *buf, loff_t off, size_t count)
3035 {
3036         struct device *dev = container_of(kobj, struct device, kobj);
3037         struct Scsi_Host *shost = class_to_shost(dev);
3038         struct ibmvfc_host *vhost = shost_priv(shost);
3039         unsigned long flags = 0;
3040         int size = IBMVFC_TRACE_SIZE;
3041         char *src = (char *)vhost->trace;
3042 
3043         if (off > size)
3044                 return 0;
3045         if (off + count > size) {
3046                 size -= off;
3047                 count = size;
3048         }
3049 
3050         spin_lock_irqsave(shost->host_lock, flags);
3051         memcpy(buf, &src[off], count);
3052         spin_unlock_irqrestore(shost->host_lock, flags);
3053         return count;
3054 }
3055 
3056 static struct bin_attribute ibmvfc_trace_attr = {
3057         .attr = {
3058                 .name = "trace",
3059                 .mode = S_IRUGO,
3060         },
3061         .size = 0,
3062         .read = ibmvfc_read_trace,
3063 };
3064 #endif
3065 
3066 static struct device_attribute *ibmvfc_attrs[] = {
3067         &dev_attr_partition_name,
3068         &dev_attr_device_name,
3069         &dev_attr_port_loc_code,
3070         &dev_attr_drc_name,
3071         &dev_attr_npiv_version,
3072         &dev_attr_capabilities,
3073         &dev_attr_log_level,
3074         NULL
3075 };
3076 
3077 static struct scsi_host_template driver_template = {
3078         .module = THIS_MODULE,
3079         .name = "IBM POWER Virtual FC Adapter",
3080         .proc_name = IBMVFC_NAME,
3081         .queuecommand = ibmvfc_queuecommand,
3082         .eh_abort_handler = ibmvfc_eh_abort_handler,
3083         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3084         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3085         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3086         .slave_alloc = ibmvfc_slave_alloc,
3087         .slave_configure = ibmvfc_slave_configure,
3088         .target_alloc = ibmvfc_target_alloc,
3089         .scan_finished = ibmvfc_scan_finished,
3090         .change_queue_depth = ibmvfc_change_queue_depth,
3091         .cmd_per_lun = 16,
3092         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3093         .this_id = -1,
3094         .sg_tablesize = SG_ALL,
3095         .max_sectors = IBMVFC_MAX_SECTORS,
3096         .use_clustering = ENABLE_CLUSTERING,
3097         .shost_attrs = ibmvfc_attrs,
3098         .use_blk_tags = 1,
3099         .track_queue_depth = 1,
3100 };
3101 
3102 /**
3103  * ibmvfc_next_async_crq - Returns the next entry in async queue
3104  * @vhost:      ibmvfc host struct
3105  *
3106  * Returns:
3107  *      Pointer to next entry in queue / NULL if empty
3108  **/
3109 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3110 {
3111         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3112         struct ibmvfc_async_crq *crq;
3113 
3114         crq = &async_crq->msgs[async_crq->cur];
3115         if (crq->valid & 0x80) {
3116                 if (++async_crq->cur == async_crq->size)
3117                         async_crq->cur = 0;
3118                 rmb();
3119         } else
3120                 crq = NULL;
3121 
3122         return crq;
3123 }
3124 
3125 /**
3126  * ibmvfc_next_crq - Returns the next entry in message queue
3127  * @vhost:      ibmvfc host struct
3128  *
3129  * Returns:
3130  *      Pointer to next entry in queue / NULL if empty
3131  **/
3132 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3133 {
3134         struct ibmvfc_crq_queue *queue = &vhost->crq;
3135         struct ibmvfc_crq *crq;
3136 
3137         crq = &queue->msgs[queue->cur];
3138         if (crq->valid & 0x80) {
3139                 if (++queue->cur == queue->size)
3140                         queue->cur = 0;
3141                 rmb();
3142         } else
3143                 crq = NULL;
3144 
3145         return crq;
3146 }
3147 
3148 /**
3149  * ibmvfc_interrupt - Interrupt handler
3150  * @irq:                number of irq to handle, not used
3151  * @dev_instance: ibmvfc_host that received interrupt
3152  *
3153  * Returns:
3154  *      IRQ_HANDLED
3155  **/
3156 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3157 {
3158         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3159         unsigned long flags;
3160 
3161         spin_lock_irqsave(vhost->host->host_lock, flags);
3162         vio_disable_interrupts(to_vio_dev(vhost->dev));
3163         tasklet_schedule(&vhost->tasklet);
3164         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3165         return IRQ_HANDLED;
3166 }
3167 
3168 /**
3169  * ibmvfc_tasklet - Interrupt handler tasklet
3170  * @data:               ibmvfc host struct
3171  *
3172  * Returns:
3173  *      Nothing
3174  **/
3175 static void ibmvfc_tasklet(void *data)
3176 {
3177         struct ibmvfc_host *vhost = data;
3178         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3179         struct ibmvfc_crq *crq;
3180         struct ibmvfc_async_crq *async;
3181         unsigned long flags;
3182         int done = 0;
3183 
3184         spin_lock_irqsave(vhost->host->host_lock, flags);
3185         while (!done) {
3186                 /* Pull all the valid messages off the async CRQ */
3187                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3188                         ibmvfc_handle_async(async, vhost);
3189                         async->valid = 0;
3190                         wmb();
3191                 }
3192 
3193                 /* Pull all the valid messages off the CRQ */
3194                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3195                         ibmvfc_handle_crq(crq, vhost);
3196                         crq->valid = 0;
3197                         wmb();
3198                 }
3199 
3200                 vio_enable_interrupts(vdev);
3201                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3202                         vio_disable_interrupts(vdev);
3203                         ibmvfc_handle_async(async, vhost);
3204                         async->valid = 0;
3205                         wmb();
3206                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3207                         vio_disable_interrupts(vdev);
3208                         ibmvfc_handle_crq(crq, vhost);
3209                         crq->valid = 0;
3210                         wmb();
3211                 } else
3212                         done = 1;
3213         }
3214 
3215         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3216 }
3217 
3218 /**
3219  * ibmvfc_init_tgt - Set the next init job step for the target
3220  * @tgt:                ibmvfc target struct
3221  * @job_step:   job step to perform
3222  *
3223  **/
3224 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3225                             void (*job_step) (struct ibmvfc_target *))
3226 {
3227         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3228         tgt->job_step = job_step;
3229         wake_up(&tgt->vhost->work_wait_q);
3230 }
3231 
3232 /**
3233  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3234  * @tgt:                ibmvfc target struct
3235  * @job_step:   initialization job step
3236  *
3237  * Returns: 1 if step will be retried / 0 if not
3238  *
3239  **/
3240 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3241                                   void (*job_step) (struct ibmvfc_target *))
3242 {
3243         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3244                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3245                 wake_up(&tgt->vhost->work_wait_q);
3246                 return 0;
3247         } else
3248                 ibmvfc_init_tgt(tgt, job_step);
3249         return 1;
3250 }
3251 
3252 /* Defined in FC-LS */
3253 static const struct {
3254         int code;
3255         int retry;
3256         int logged_in;
3257 } prli_rsp [] = {
3258         { 0, 1, 0 },
3259         { 1, 0, 1 },
3260         { 2, 1, 0 },
3261         { 3, 1, 0 },
3262         { 4, 0, 0 },
3263         { 5, 0, 0 },
3264         { 6, 0, 1 },
3265         { 7, 0, 0 },
3266         { 8, 1, 0 },
3267 };
3268 
3269 /**
3270  * ibmvfc_get_prli_rsp - Find PRLI response index
3271  * @flags:      PRLI response flags
3272  *
3273  **/
3274 static int ibmvfc_get_prli_rsp(u16 flags)
3275 {
3276         int i;
3277         int code = (flags & 0x0f00) >> 8;
3278 
3279         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3280                 if (prli_rsp[i].code == code)
3281                         return i;
3282 
3283         return 0;
3284 }
3285 
3286 /**
3287  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3288  * @evt:        ibmvfc event struct
3289  *
3290  **/
3291 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3292 {
3293         struct ibmvfc_target *tgt = evt->tgt;
3294         struct ibmvfc_host *vhost = evt->vhost;
3295         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3296         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3297         u32 status = be16_to_cpu(rsp->common.status);
3298         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3299 
3300         vhost->discovery_threads--;
3301         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3302         switch (status) {
3303         case IBMVFC_MAD_SUCCESS:
3304                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3305                         parms->type, parms->flags, parms->service_parms);
3306 
3307                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3308                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3309                         if (prli_rsp[index].logged_in) {
3310                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3311                                         tgt->need_login = 0;
3312                                         tgt->ids.roles = 0;
3313                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3314                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3315                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3316                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3317                                         tgt->add_rport = 1;
3318                                 } else
3319                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3320                         } else if (prli_rsp[index].retry)
3321                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3322                         else
3323                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3324                 } else
3325                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3326                 break;
3327         case IBMVFC_MAD_DRIVER_FAILED:
3328                 break;
3329         case IBMVFC_MAD_CRQ_ERROR:
3330                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3331                 break;
3332         case IBMVFC_MAD_FAILED:
3333         default:
3334                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3335                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3336                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3337                 else if (tgt->logo_rcvd)
3338                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3339                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3340                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3341                 else
3342                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3343 
3344                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3345                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3346                         rsp->status, rsp->error, status);
3347                 break;
3348         };
3349 
3350         kref_put(&tgt->kref, ibmvfc_release_tgt);
3351         ibmvfc_free_event(evt);
3352         wake_up(&vhost->work_wait_q);
3353 }
3354 
3355 /**
3356  * ibmvfc_tgt_send_prli - Send a process login
3357  * @tgt:        ibmvfc target struct
3358  *
3359  **/
3360 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3361 {
3362         struct ibmvfc_process_login *prli;
3363         struct ibmvfc_host *vhost = tgt->vhost;
3364         struct ibmvfc_event *evt;
3365 
3366         if (vhost->discovery_threads >= disc_threads)
3367                 return;
3368 
3369         kref_get(&tgt->kref);
3370         evt = ibmvfc_get_event(vhost);
3371         vhost->discovery_threads++;
3372         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3373         evt->tgt = tgt;
3374         prli = &evt->iu.prli;
3375         memset(prli, 0, sizeof(*prli));
3376         prli->common.version = cpu_to_be32(1);
3377         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3378         prli->common.length = cpu_to_be16(sizeof(*prli));
3379         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3380 
3381         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3382         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3383         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3384 
3385         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3386         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3387                 vhost->discovery_threads--;
3388                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3389                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3390         } else
3391                 tgt_dbg(tgt, "Sent process login\n");
3392 }
3393 
3394 /**
3395  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3396  * @evt:        ibmvfc event struct
3397  *
3398  **/
3399 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3400 {
3401         struct ibmvfc_target *tgt = evt->tgt;
3402         struct ibmvfc_host *vhost = evt->vhost;
3403         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3404         u32 status = be16_to_cpu(rsp->common.status);
3405         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3406 
3407         vhost->discovery_threads--;
3408         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3409         switch (status) {
3410         case IBMVFC_MAD_SUCCESS:
3411                 tgt_dbg(tgt, "Port Login succeeded\n");
3412                 if (tgt->ids.port_name &&
3413                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3414                         vhost->reinit = 1;
3415                         tgt_dbg(tgt, "Port re-init required\n");
3416                         break;
3417                 }
3418                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3419                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3420                 tgt->ids.port_id = tgt->scsi_id;
3421                 memcpy(&tgt->service_parms, &rsp->service_parms,
3422                        sizeof(tgt->service_parms));
3423                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3424                        sizeof(tgt->service_parms_change));
3425                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3426                 break;
3427         case IBMVFC_MAD_DRIVER_FAILED:
3428                 break;
3429         case IBMVFC_MAD_CRQ_ERROR:
3430                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3431                 break;
3432         case IBMVFC_MAD_FAILED:
3433         default:
3434                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3435                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3436                 else
3437                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3438 
3439                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3440                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3441                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3442                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3443                 break;
3444         };
3445 
3446         kref_put(&tgt->kref, ibmvfc_release_tgt);
3447         ibmvfc_free_event(evt);
3448         wake_up(&vhost->work_wait_q);
3449 }
3450 
3451 /**
3452  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3453  * @tgt:        ibmvfc target struct
3454  *
3455  **/
3456 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3457 {
3458         struct ibmvfc_port_login *plogi;
3459         struct ibmvfc_host *vhost = tgt->vhost;
3460         struct ibmvfc_event *evt;
3461 
3462         if (vhost->discovery_threads >= disc_threads)
3463                 return;
3464 
3465         kref_get(&tgt->kref);
3466         tgt->logo_rcvd = 0;
3467         evt = ibmvfc_get_event(vhost);
3468         vhost->discovery_threads++;
3469         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3470         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3471         evt->tgt = tgt;
3472         plogi = &evt->iu.plogi;
3473         memset(plogi, 0, sizeof(*plogi));
3474         plogi->common.version = cpu_to_be32(1);
3475         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3476         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3477         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3478 
3479         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3480                 vhost->discovery_threads--;
3481                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3482                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3483         } else
3484                 tgt_dbg(tgt, "Sent port login\n");
3485 }
3486 
3487 /**
3488  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3489  * @evt:        ibmvfc event struct
3490  *
3491  **/
3492 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3493 {
3494         struct ibmvfc_target *tgt = evt->tgt;
3495         struct ibmvfc_host *vhost = evt->vhost;
3496         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3497         u32 status = be16_to_cpu(rsp->common.status);
3498 
3499         vhost->discovery_threads--;
3500         ibmvfc_free_event(evt);
3501         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3502 
3503         switch (status) {
3504         case IBMVFC_MAD_SUCCESS:
3505                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3506                 break;
3507         case IBMVFC_MAD_DRIVER_FAILED:
3508                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3509                 wake_up(&vhost->work_wait_q);
3510                 return;
3511         case IBMVFC_MAD_FAILED:
3512         default:
3513                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3514                 break;
3515         };
3516 
3517         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3518                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3519         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3520                  tgt->scsi_id != tgt->new_scsi_id)
3521                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3522         kref_put(&tgt->kref, ibmvfc_release_tgt);
3523         wake_up(&vhost->work_wait_q);
3524 }
3525 
3526 /**
3527  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3528  * @tgt:                ibmvfc target struct
3529  *
3530  **/
3531 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3532 {
3533         struct ibmvfc_implicit_logout *mad;
3534         struct ibmvfc_host *vhost = tgt->vhost;
3535         struct ibmvfc_event *evt;
3536 
3537         if (vhost->discovery_threads >= disc_threads)
3538                 return;
3539 
3540         kref_get(&tgt->kref);
3541         evt = ibmvfc_get_event(vhost);
3542         vhost->discovery_threads++;
3543         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3544         evt->tgt = tgt;
3545         mad = &evt->iu.implicit_logout;
3546         memset(mad, 0, sizeof(*mad));
3547         mad->common.version = cpu_to_be32(1);
3548         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3549         mad->common.length = cpu_to_be16(sizeof(*mad));
3550         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3551 
3552         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3553         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3554                 vhost->discovery_threads--;
3555                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3556                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3557         } else
3558                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3559 }
3560 
3561 /**
3562  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3563  * @mad:        ibmvfc passthru mad struct
3564  * @tgt:        ibmvfc target struct
3565  *
3566  * Returns:
3567  *      1 if PLOGI needed / 0 if PLOGI not needed
3568  **/
3569 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3570                                     struct ibmvfc_target *tgt)
3571 {
3572         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3573                    sizeof(tgt->ids.port_name)))
3574                 return 1;
3575         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3576                    sizeof(tgt->ids.node_name)))
3577                 return 1;
3578         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3579                 return 1;
3580         return 0;
3581 }
3582 
3583 /**
3584  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3585  * @evt:        ibmvfc event struct
3586  *
3587  **/
3588 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3589 {
3590         struct ibmvfc_target *tgt = evt->tgt;
3591         struct ibmvfc_host *vhost = evt->vhost;
3592         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3593         u32 status = be16_to_cpu(mad->common.status);
3594         u8 fc_reason, fc_explain;
3595 
3596         vhost->discovery_threads--;
3597         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3598         del_timer(&tgt->timer);
3599 
3600         switch (status) {
3601         case IBMVFC_MAD_SUCCESS:
3602                 tgt_dbg(tgt, "ADISC succeeded\n");
3603                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3604                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3605                 break;
3606         case IBMVFC_MAD_DRIVER_FAILED:
3607                 break;
3608         case IBMVFC_MAD_FAILED:
3609         default:
3610                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3611                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3612                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3613                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3614                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3615                          mad->iu.status, mad->iu.error,
3616                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3617                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3618                 break;
3619         };
3620 
3621         kref_put(&tgt->kref, ibmvfc_release_tgt);
3622         ibmvfc_free_event(evt);
3623         wake_up(&vhost->work_wait_q);
3624 }
3625 
3626 /**
3627  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3628  * @evt:                ibmvfc event struct
3629  *
3630  **/
3631 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3632 {
3633         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3634 
3635         memset(mad, 0, sizeof(*mad));
3636         mad->common.version = cpu_to_be32(1);
3637         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3638         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3639         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3640                 offsetof(struct ibmvfc_passthru_mad, iu));
3641         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3642         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3643         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3644         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3645                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3646                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3647         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3648         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3649                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3650                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3651         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3652 }
3653 
3654 /**
3655  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3656  * @evt:                ibmvfc event struct
3657  *
3658  * Just cleanup this event struct. Everything else is handled by
3659  * the ADISC completion handler. If the ADISC never actually comes
3660  * back, we still have the timer running on the ADISC event struct
3661  * which will fire and cause the CRQ to get reset.
3662  *
3663  **/
3664 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3665 {
3666         struct ibmvfc_host *vhost = evt->vhost;
3667         struct ibmvfc_target *tgt = evt->tgt;
3668 
3669         tgt_dbg(tgt, "ADISC cancel complete\n");
3670         vhost->abort_threads--;
3671         ibmvfc_free_event(evt);
3672         kref_put(&tgt->kref, ibmvfc_release_tgt);
3673         wake_up(&vhost->work_wait_q);
3674 }
3675 
3676 /**
3677  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3678  * @tgt:                ibmvfc target struct
3679  *
3680  * If an ADISC times out, send a cancel. If the cancel times
3681  * out, reset the CRQ. When the ADISC comes back as cancelled,
3682  * log back into the target.
3683  **/
3684 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3685 {
3686         struct ibmvfc_host *vhost = tgt->vhost;
3687         struct ibmvfc_event *evt;
3688         struct ibmvfc_tmf *tmf;
3689         unsigned long flags;
3690         int rc;
3691 
3692         tgt_dbg(tgt, "ADISC timeout\n");
3693         spin_lock_irqsave(vhost->host->host_lock, flags);
3694         if (vhost->abort_threads >= disc_threads ||
3695             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3696             vhost->state != IBMVFC_INITIALIZING ||
3697             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3698                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3699                 return;
3700         }
3701 
3702         vhost->abort_threads++;
3703         kref_get(&tgt->kref);
3704         evt = ibmvfc_get_event(vhost);
3705         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3706 
3707         evt->tgt = tgt;
3708         tmf = &evt->iu.tmf;
3709         memset(tmf, 0, sizeof(*tmf));
3710         tmf->common.version = cpu_to_be32(1);
3711         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3712         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3713         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3714         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3715 
3716         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3717 
3718         if (rc) {
3719                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3720                 vhost->abort_threads--;
3721                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3722                 __ibmvfc_reset_host(vhost);
3723         } else
3724                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3725         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3726 }
3727 
3728 /**
3729  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3730  * @tgt:                ibmvfc target struct
3731  *
3732  * When sending an ADISC we end up with two timers running. The
3733  * first timer is the timer in the ibmvfc target struct. If this
3734  * fires, we send a cancel to the target. The second timer is the
3735  * timer on the ibmvfc event for the ADISC, which is longer. If that
3736  * fires, it means the ADISC timed out and our attempt to cancel it
3737  * also failed, so we need to reset the CRQ.
3738  **/
3739 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3740 {
3741         struct ibmvfc_passthru_mad *mad;
3742         struct ibmvfc_host *vhost = tgt->vhost;
3743         struct ibmvfc_event *evt;
3744 
3745         if (vhost->discovery_threads >= disc_threads)
3746                 return;
3747 
3748         kref_get(&tgt->kref);
3749         evt = ibmvfc_get_event(vhost);
3750         vhost->discovery_threads++;
3751         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3752         evt->tgt = tgt;
3753 
3754         ibmvfc_init_passthru(evt);
3755         mad = &evt->iu.passthru;
3756         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3757         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3758         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3759 
3760         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3761         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3762                sizeof(vhost->login_buf->resp.port_name));
3763         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3764                sizeof(vhost->login_buf->resp.node_name));
3765         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3766 
3767         if (timer_pending(&tgt->timer))
3768                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3769         else {
3770                 tgt->timer.data = (unsigned long) tgt;
3771                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3772                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3773                 add_timer(&tgt->timer);
3774         }
3775 
3776         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3777         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3778                 vhost->discovery_threads--;
3779                 del_timer(&tgt->timer);
3780                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3781                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3782         } else
3783                 tgt_dbg(tgt, "Sent ADISC\n");
3784 }
3785 
3786 /**
3787  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3788  * @evt:        ibmvfc event struct
3789  *
3790  **/
3791 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3792 {
3793         struct ibmvfc_target *tgt = evt->tgt;
3794         struct ibmvfc_host *vhost = evt->vhost;
3795         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3796         u32 status = be16_to_cpu(rsp->common.status);
3797         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3798 
3799         vhost->discovery_threads--;
3800         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3801         switch (status) {
3802         case IBMVFC_MAD_SUCCESS:
3803                 tgt_dbg(tgt, "Query Target succeeded\n");
3804                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3805                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3806                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3807                 else
3808                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3809                 break;
3810         case IBMVFC_MAD_DRIVER_FAILED:
3811                 break;
3812         case IBMVFC_MAD_CRQ_ERROR:
3813                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3814                 break;
3815         case IBMVFC_MAD_FAILED:
3816         default:
3817                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3818                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3819                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3820                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3821                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3822                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3823                 else
3824                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3825 
3826                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3827                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3828                         rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3829                         rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3830                         rsp->fc_explain, status);
3831                 break;
3832         };
3833 
3834         kref_put(&tgt->kref, ibmvfc_release_tgt);
3835         ibmvfc_free_event(evt);
3836         wake_up(&vhost->work_wait_q);
3837 }
3838 
3839 /**
3840  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3841  * @tgt:        ibmvfc target struct
3842  *
3843  **/
3844 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3845 {
3846         struct ibmvfc_query_tgt *query_tgt;
3847         struct ibmvfc_host *vhost = tgt->vhost;
3848         struct ibmvfc_event *evt;
3849 
3850         if (vhost->discovery_threads >= disc_threads)
3851                 return;
3852 
3853         kref_get(&tgt->kref);
3854         evt = ibmvfc_get_event(vhost);
3855         vhost->discovery_threads++;
3856         evt->tgt = tgt;
3857         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3858         query_tgt = &evt->iu.query_tgt;
3859         memset(query_tgt, 0, sizeof(*query_tgt));
3860         query_tgt->common.version = cpu_to_be32(1);
3861         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3862         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3863         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3864 
3865         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3866         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3867                 vhost->discovery_threads--;
3868                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3869                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3870         } else
3871                 tgt_dbg(tgt, "Sent Query Target\n");
3872 }
3873 
3874 /**
3875  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3876  * @vhost:              ibmvfc host struct
3877  * @scsi_id:    SCSI ID to allocate target for
3878  *
3879  * Returns:
3880  *      0 on success / other on failure
3881  **/
3882 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3883 {
3884         struct ibmvfc_target *tgt;
3885         unsigned long flags;
3886 
3887         spin_lock_irqsave(vhost->host->host_lock, flags);
3888         list_for_each_entry(tgt, &vhost->targets, queue) {
3889                 if (tgt->scsi_id == scsi_id) {
3890                         if (tgt->need_login)
3891                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3892                         goto unlock_out;
3893                 }
3894         }
3895         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3896 
3897         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3898         if (!tgt) {
3899                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3900                         scsi_id);
3901                 return -ENOMEM;
3902         }
3903 
3904         memset(tgt, 0, sizeof(*tgt));
3905         tgt->scsi_id = scsi_id;
3906         tgt->new_scsi_id = scsi_id;
3907         tgt->vhost = vhost;
3908         tgt->need_login = 1;
3909         tgt->cancel_key = vhost->task_set++;
3910         init_timer(&tgt->timer);
3911         kref_init(&tgt->kref);
3912         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3913         spin_lock_irqsave(vhost->host->host_lock, flags);
3914         list_add_tail(&tgt->queue, &vhost->targets);
3915 
3916 unlock_out:
3917         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3918         return 0;
3919 }
3920 
3921 /**
3922  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3923  * @vhost:              ibmvfc host struct
3924  *
3925  * Returns:
3926  *      0 on success / other on failure
3927  **/
3928 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3929 {
3930         int i, rc;
3931 
3932         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3933                 rc = ibmvfc_alloc_target(vhost,
3934                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3935                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3936 
3937         return rc;
3938 }
3939 
3940 /**
3941  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3942  * @evt:        ibmvfc event struct
3943  *
3944  **/
3945 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3946 {
3947         struct ibmvfc_host *vhost = evt->vhost;
3948         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3949         u32 mad_status = be16_to_cpu(rsp->common.status);
3950         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3951 
3952         switch (mad_status) {
3953         case IBMVFC_MAD_SUCCESS:
3954                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3955                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3956                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3957                 break;
3958         case IBMVFC_MAD_FAILED:
3959                 level += ibmvfc_retry_host_init(vhost);
3960                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3961                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3962                            rsp->status, rsp->error);
3963                 break;
3964         case IBMVFC_MAD_DRIVER_FAILED:
3965                 break;
3966         default:
3967                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3968                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3969                 break;
3970         }
3971 
3972         ibmvfc_free_event(evt);
3973         wake_up(&vhost->work_wait_q);
3974 }
3975 
3976 /**
3977  * ibmvfc_discover_targets - Send Discover Targets MAD
3978  * @vhost:      ibmvfc host struct
3979  *
3980  **/
3981 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3982 {
3983         struct ibmvfc_discover_targets *mad;
3984         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3985 
3986         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3987         mad = &evt->iu.discover_targets;
3988         memset(mad, 0, sizeof(*mad));
3989         mad->common.version = cpu_to_be32(1);
3990         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
3991         mad->common.length = cpu_to_be16(sizeof(*mad));
3992         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
3993         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
3994         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
3995         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
3996 
3997         if (!ibmvfc_send_event(evt, vhost, default_timeout))
3998                 ibmvfc_dbg(vhost, "Sent discover targets\n");
3999         else
4000                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4001 }
4002 
4003 /**
4004  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4005  * @evt:        ibmvfc event struct
4006  *
4007  **/
4008 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4009 {
4010         struct ibmvfc_host *vhost = evt->vhost;
4011         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4012         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4013         unsigned int npiv_max_sectors;
4014         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4015 
4016         switch (mad_status) {
4017         case IBMVFC_MAD_SUCCESS:
4018                 ibmvfc_free_event(evt);
4019                 break;
4020         case IBMVFC_MAD_FAILED:
4021                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4022                         level += ibmvfc_retry_host_init(vhost);
4023                 else
4024                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4025                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4026                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4027                                                 rsp->status, rsp->error);
4028                 ibmvfc_free_event(evt);
4029                 return;
4030         case IBMVFC_MAD_CRQ_ERROR:
4031                 ibmvfc_retry_host_init(vhost);
4032         case IBMVFC_MAD_DRIVER_FAILED:
4033                 ibmvfc_free_event(evt);
4034                 return;
4035         default:
4036                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4037                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4038                 ibmvfc_free_event(evt);
4039                 return;
4040         }
4041 
4042         vhost->client_migrated = 0;
4043 
4044         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4045                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4046                         rsp->flags);
4047                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4048                 wake_up(&vhost->work_wait_q);
4049                 return;
4050         }
4051 
4052         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4053                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4054                         rsp->max_cmds);
4055                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4056                 wake_up(&vhost->work_wait_q);
4057                 return;
4058         }
4059 
4060         vhost->logged_in = 1;
4061         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4062         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4063                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4064                  rsp->drc_name, npiv_max_sectors);
4065 
4066         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4067         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4068         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4069         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4070         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4071         fc_host_supported_classes(vhost->host) = 0;
4072         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4073                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4074         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4075                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4076         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4077                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4078         fc_host_maxframe_size(vhost->host) =
4079                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4080 
4081         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4082         vhost->host->max_sectors = npiv_max_sectors;
4083         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4084         wake_up(&vhost->work_wait_q);
4085 }
4086 
4087 /**
4088  * ibmvfc_npiv_login - Sends NPIV login
4089  * @vhost:      ibmvfc host struct
4090  *
4091  **/
4092 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4093 {
4094         struct ibmvfc_npiv_login_mad *mad;
4095         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4096 
4097         ibmvfc_gather_partition_info(vhost);
4098         ibmvfc_set_login_info(vhost);
4099         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4100 
4101         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4102         mad = &evt->iu.npiv_login;
4103         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4104         mad->common.version = cpu_to_be32(1);
4105         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4106         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4107         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4108         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4109 
4110         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4111 
4112         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4113                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4114         else
4115                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4116 };
4117 
4118 /**
4119  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4120  * @vhost:              ibmvfc host struct
4121  *
4122  **/
4123 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4124 {
4125         struct ibmvfc_host *vhost = evt->vhost;
4126         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4127 
4128         ibmvfc_free_event(evt);
4129 
4130         switch (mad_status) {
4131         case IBMVFC_MAD_SUCCESS:
4132                 if (list_empty(&vhost->sent) &&
4133                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4134                         ibmvfc_init_host(vhost);
4135                         return;
4136                 }
4137                 break;
4138         case IBMVFC_MAD_FAILED:
4139         case IBMVFC_MAD_NOT_SUPPORTED:
4140         case IBMVFC_MAD_CRQ_ERROR:
4141         case IBMVFC_MAD_DRIVER_FAILED:
4142         default:
4143                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4144                 break;
4145         }
4146 
4147         ibmvfc_hard_reset_host(vhost);
4148 }
4149 
4150 /**
4151  * ibmvfc_npiv_logout - Issue an NPIV Logout
4152  * @vhost:              ibmvfc host struct
4153  *
4154  **/
4155 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4156 {
4157         struct ibmvfc_npiv_logout_mad *mad;
4158         struct ibmvfc_event *evt;
4159 
4160         evt = ibmvfc_get_event(vhost);
4161         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4162 
4163         mad = &evt->iu.npiv_logout;
4164         memset(mad, 0, sizeof(*mad));
4165         mad->common.version = cpu_to_be32(1);
4166         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4167         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4168 
4169         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4170 
4171         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4172                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4173         else
4174                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4175 }
4176 
4177 /**
4178  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4179  * @vhost:              ibmvfc host struct
4180  *
4181  * Returns:
4182  *      1 if work to do / 0 if not
4183  **/
4184 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4185 {
4186         struct ibmvfc_target *tgt;
4187 
4188         list_for_each_entry(tgt, &vhost->targets, queue) {
4189                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4190                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4191                         return 1;
4192         }
4193 
4194         return 0;
4195 }
4196 
4197 /**
4198  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4199  * @vhost:              ibmvfc host struct
4200  *
4201  * Returns:
4202  *      1 if work to do / 0 if not
4203  **/
4204 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4205 {
4206         struct ibmvfc_target *tgt;
4207 
4208         if (kthread_should_stop())
4209                 return 1;
4210         switch (vhost->action) {
4211         case IBMVFC_HOST_ACTION_NONE:
4212         case IBMVFC_HOST_ACTION_INIT_WAIT:
4213         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4214                 return 0;
4215         case IBMVFC_HOST_ACTION_TGT_INIT:
4216         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4217                 if (vhost->discovery_threads == disc_threads)
4218                         return 0;
4219                 list_for_each_entry(tgt, &vhost->targets, queue)
4220                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4221                                 return 1;
4222                 list_for_each_entry(tgt, &vhost->targets, queue)
4223                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4224                                 return 0;
4225                 return 1;
4226         case IBMVFC_HOST_ACTION_LOGO:
4227         case IBMVFC_HOST_ACTION_INIT:
4228         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4229         case IBMVFC_HOST_ACTION_TGT_DEL:
4230         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4231         case IBMVFC_HOST_ACTION_QUERY:
4232         case IBMVFC_HOST_ACTION_RESET:
4233         case IBMVFC_HOST_ACTION_REENABLE:
4234         default:
4235                 break;
4236         };
4237 
4238         return 1;
4239 }
4240 
4241 /**
4242  * ibmvfc_work_to_do - Is there task level work to do?
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         unsigned long flags;
4251         int rc;
4252 
4253         spin_lock_irqsave(vhost->host->host_lock, flags);
4254         rc = __ibmvfc_work_to_do(vhost);
4255         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4256         return rc;
4257 }
4258 
4259 /**
4260  * ibmvfc_log_ae - Log async events if necessary
4261  * @vhost:              ibmvfc host struct
4262  * @events:             events to log
4263  *
4264  **/
4265 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4266 {
4267         if (events & IBMVFC_AE_RSCN)
4268                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4269         if ((events & IBMVFC_AE_LINKDOWN) &&
4270             vhost->state >= IBMVFC_HALTED)
4271                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4272         if ((events & IBMVFC_AE_LINKUP) &&
4273             vhost->state == IBMVFC_INITIALIZING)
4274                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4275 }
4276 
4277 /**
4278  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4279  * @tgt:                ibmvfc target struct
4280  *
4281  **/
4282 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4283 {
4284         struct ibmvfc_host *vhost = tgt->vhost;
4285         struct fc_rport *rport;
4286         unsigned long flags;
4287 
4288         tgt_dbg(tgt, "Adding rport\n");
4289         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4290         spin_lock_irqsave(vhost->host->host_lock, flags);
4291 
4292         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4293                 tgt_dbg(tgt, "Deleting rport\n");
4294                 list_del(&tgt->queue);
4295                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4296                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4297                 fc_remote_port_delete(rport);
4298                 del_timer_sync(&tgt->timer);
4299                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4300                 return;
4301         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4302                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4303                 return;
4304         }
4305 
4306         if (rport) {
4307                 tgt_dbg(tgt, "rport add succeeded\n");
4308                 tgt->rport = rport;
4309                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4310                 rport->supported_classes = 0;
4311                 tgt->target_id = rport->scsi_target_id;
4312                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4313                         rport->supported_classes |= FC_COS_CLASS1;
4314                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4315                         rport->supported_classes |= FC_COS_CLASS2;
4316                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4317                         rport->supported_classes |= FC_COS_CLASS3;
4318                 if (rport->rqst_q)
4319                         blk_queue_max_segments(rport->rqst_q, 1);
4320         } else
4321                 tgt_dbg(tgt, "rport add failed\n");
4322         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4323 }
4324 
4325 /**
4326  * ibmvfc_do_work - Do task level work
4327  * @vhost:              ibmvfc host struct
4328  *
4329  **/
4330 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4331 {
4332         struct ibmvfc_target *tgt;
4333         unsigned long flags;
4334         struct fc_rport *rport;
4335         int rc;
4336 
4337         ibmvfc_log_ae(vhost, vhost->events_to_log);
4338         spin_lock_irqsave(vhost->host->host_lock, flags);
4339         vhost->events_to_log = 0;
4340         switch (vhost->action) {
4341         case IBMVFC_HOST_ACTION_NONE:
4342         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4343         case IBMVFC_HOST_ACTION_INIT_WAIT:
4344                 break;
4345         case IBMVFC_HOST_ACTION_RESET:
4346                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4347                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4348                 rc = ibmvfc_reset_crq(vhost);
4349                 spin_lock_irqsave(vhost->host->host_lock, flags);
4350                 if (rc == H_CLOSED)
4351                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4352                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4353                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4354                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4355                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4356                 }
4357                 break;
4358         case IBMVFC_HOST_ACTION_REENABLE:
4359                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4360                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4361                 rc = ibmvfc_reenable_crq_queue(vhost);
4362                 spin_lock_irqsave(vhost->host->host_lock, flags);
4363                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4364                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4365                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4366                 }
4367                 break;
4368         case IBMVFC_HOST_ACTION_LOGO:
4369                 vhost->job_step(vhost);
4370                 break;
4371         case IBMVFC_HOST_ACTION_INIT:
4372                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4373                 if (vhost->delay_init) {
4374                         vhost->delay_init = 0;
4375                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4376                         ssleep(15);
4377                         return;
4378                 } else
4379                         vhost->job_step(vhost);
4380                 break;
4381         case IBMVFC_HOST_ACTION_QUERY:
4382                 list_for_each_entry(tgt, &vhost->targets, queue)
4383                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4384                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4385                 break;
4386         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4387                 list_for_each_entry(tgt, &vhost->targets, queue) {
4388                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4389                                 tgt->job_step(tgt);
4390                                 break;
4391                         }
4392                 }
4393 
4394                 if (!ibmvfc_dev_init_to_do(vhost))
4395                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4396                 break;
4397         case IBMVFC_HOST_ACTION_TGT_DEL:
4398         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4399                 list_for_each_entry(tgt, &vhost->targets, queue) {
4400                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4401                                 tgt_dbg(tgt, "Deleting rport\n");
4402                                 rport = tgt->rport;
4403                                 tgt->rport = NULL;
4404                                 list_del(&tgt->queue);
4405                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4406                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4407                                 if (rport)
4408                                         fc_remote_port_delete(rport);
4409                                 del_timer_sync(&tgt->timer);
4410                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4411                                 return;
4412                         }
4413                 }
4414 
4415                 if (vhost->state == IBMVFC_INITIALIZING) {
4416                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4417                                 if (vhost->reinit) {
4418                                         vhost->reinit = 0;
4419                                         scsi_block_requests(vhost->host);
4420                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4421                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4422                                 } else {
4423                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4424                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4425                                         wake_up(&vhost->init_wait_q);
4426                                         schedule_work(&vhost->rport_add_work_q);
4427                                         vhost->init_retries = 0;
4428                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4429                                         scsi_unblock_requests(vhost->host);
4430                                 }
4431 
4432                                 return;
4433                         } else {
4434                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4435                                 vhost->job_step = ibmvfc_discover_targets;
4436                         }
4437                 } else {
4438                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4439                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4440                         scsi_unblock_requests(vhost->host);
4441                         wake_up(&vhost->init_wait_q);
4442                         return;
4443                 }
4444                 break;
4445         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4446                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4447                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4448                 ibmvfc_alloc_targets(vhost);
4449                 spin_lock_irqsave(vhost->host->host_lock, flags);
4450                 break;
4451         case IBMVFC_HOST_ACTION_TGT_INIT:
4452                 list_for_each_entry(tgt, &vhost->targets, queue) {
4453                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4454                                 tgt->job_step(tgt);
4455                                 break;
4456                         }
4457                 }
4458 
4459                 if (!ibmvfc_dev_init_to_do(vhost))
4460                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4461                 break;
4462         default:
4463                 break;
4464         };
4465 
4466         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4467 }
4468 
4469 /**
4470  * ibmvfc_work - Do task level work
4471  * @data:               ibmvfc host struct
4472  *
4473  * Returns:
4474  *      zero
4475  **/
4476 static int ibmvfc_work(void *data)
4477 {
4478         struct ibmvfc_host *vhost = data;
4479         int rc;
4480 
4481         set_user_nice(current, MIN_NICE);
4482 
4483         while (1) {
4484                 rc = wait_event_interruptible(vhost->work_wait_q,
4485                                               ibmvfc_work_to_do(vhost));
4486 
4487                 BUG_ON(rc);
4488 
4489                 if (kthread_should_stop())
4490                         break;
4491 
4492                 ibmvfc_do_work(vhost);
4493         }
4494 
4495         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4496         return 0;
4497 }
4498 
4499 /**
4500  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4501  * @vhost:      ibmvfc host struct
4502  *
4503  * Allocates a page for messages, maps it for dma, and registers
4504  * the crq with the hypervisor.
4505  *
4506  * Return value:
4507  *      zero on success / other on failure
4508  **/
4509 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4510 {
4511         int rc, retrc = -ENOMEM;
4512         struct device *dev = vhost->dev;
4513         struct vio_dev *vdev = to_vio_dev(dev);
4514         struct ibmvfc_crq_queue *crq = &vhost->crq;
4515 
4516         ENTER;
4517         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4518 
4519         if (!crq->msgs)
4520                 return -ENOMEM;
4521 
4522         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4523         crq->msg_token = dma_map_single(dev, crq->msgs,
4524                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4525 
4526         if (dma_mapping_error(dev, crq->msg_token))
4527                 goto map_failed;
4528 
4529         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4530                                         crq->msg_token, PAGE_SIZE);
4531 
4532         if (rc == H_RESOURCE)
4533                 /* maybe kexecing and resource is busy. try a reset */
4534                 retrc = rc = ibmvfc_reset_crq(vhost);
4535 
4536         if (rc == H_CLOSED)
4537                 dev_warn(dev, "Partner adapter not ready\n");
4538         else if (rc) {
4539                 dev_warn(dev, "Error %d opening adapter\n", rc);
4540                 goto reg_crq_failed;
4541         }
4542 
4543         retrc = 0;
4544 
4545         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4546 
4547         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4548                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4549                 goto req_irq_failed;
4550         }
4551 
4552         if ((rc = vio_enable_interrupts(vdev))) {
4553                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4554                 goto req_irq_failed;
4555         }
4556 
4557         crq->cur = 0;
4558         LEAVE;
4559         return retrc;
4560 
4561 req_irq_failed:
4562         tasklet_kill(&vhost->tasklet);
4563         do {
4564                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4565         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4566 reg_crq_failed:
4567         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4568 map_failed:
4569         free_page((unsigned long)crq->msgs);
4570         return retrc;
4571 }
4572 
4573 /**
4574  * ibmvfc_free_mem - Free memory for vhost
4575  * @vhost:      ibmvfc host struct
4576  *
4577  * Return value:
4578  *      none
4579  **/
4580 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4581 {
4582         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4583 
4584         ENTER;
4585         mempool_destroy(vhost->tgt_pool);
4586         kfree(vhost->trace);
4587         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4588                           vhost->disc_buf_dma);
4589         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4590                           vhost->login_buf, vhost->login_buf_dma);
4591         dma_pool_destroy(vhost->sg_pool);
4592         dma_unmap_single(vhost->dev, async_q->msg_token,
4593                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4594         free_page((unsigned long)async_q->msgs);
4595         LEAVE;
4596 }
4597 
4598 /**
4599  * ibmvfc_alloc_mem - Allocate memory for vhost
4600  * @vhost:      ibmvfc host struct
4601  *
4602  * Return value:
4603  *      0 on success / non-zero on failure
4604  **/
4605 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4606 {
4607         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4608         struct device *dev = vhost->dev;
4609 
4610         ENTER;
4611         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4612         if (!async_q->msgs) {
4613                 dev_err(dev, "Couldn't allocate async queue.\n");
4614                 goto nomem;
4615         }
4616 
4617         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4618         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4619                                             async_q->size * sizeof(*async_q->msgs),
4620                                             DMA_BIDIRECTIONAL);
4621 
4622         if (dma_mapping_error(dev, async_q->msg_token)) {
4623                 dev_err(dev, "Failed to map async queue\n");
4624                 goto free_async_crq;
4625         }
4626 
4627         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4628                                          SG_ALL * sizeof(struct srp_direct_buf),
4629                                          sizeof(struct srp_direct_buf), 0);
4630 
4631         if (!vhost->sg_pool) {
4632                 dev_err(dev, "Failed to allocate sg pool\n");
4633                 goto unmap_async_crq;
4634         }
4635 
4636         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4637                                               &vhost->login_buf_dma, GFP_KERNEL);
4638 
4639         if (!vhost->login_buf) {
4640                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4641                 goto free_sg_pool;
4642         }
4643 
4644         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4645         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4646                                              &vhost->disc_buf_dma, GFP_KERNEL);
4647 
4648         if (!vhost->disc_buf) {
4649                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4650                 goto free_login_buffer;
4651         }
4652 
4653         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4654                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4655 
4656         if (!vhost->trace)
4657                 goto free_disc_buffer;
4658 
4659         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4660                                                       sizeof(struct ibmvfc_target));
4661 
4662         if (!vhost->tgt_pool) {
4663                 dev_err(dev, "Couldn't allocate target memory pool\n");
4664                 goto free_trace;
4665         }
4666 
4667         LEAVE;
4668         return 0;
4669 
4670 free_trace:
4671         kfree(vhost->trace);
4672 free_disc_buffer:
4673         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4674                           vhost->disc_buf_dma);
4675 free_login_buffer:
4676         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4677                           vhost->login_buf, vhost->login_buf_dma);
4678 free_sg_pool:
4679         dma_pool_destroy(vhost->sg_pool);
4680 unmap_async_crq:
4681         dma_unmap_single(dev, async_q->msg_token,
4682                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4683 free_async_crq:
4684         free_page((unsigned long)async_q->msgs);
4685 nomem:
4686         LEAVE;
4687         return -ENOMEM;
4688 }
4689 
4690 /**
4691  * ibmvfc_rport_add_thread - Worker thread for rport adds
4692  * @work:       work struct
4693  *
4694  **/
4695 static void ibmvfc_rport_add_thread(struct work_struct *work)
4696 {
4697         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4698                                                  rport_add_work_q);
4699         struct ibmvfc_target *tgt;
4700         struct fc_rport *rport;
4701         unsigned long flags;
4702         int did_work;
4703 
4704         ENTER;
4705         spin_lock_irqsave(vhost->host->host_lock, flags);
4706         do {
4707                 did_work = 0;
4708                 if (vhost->state != IBMVFC_ACTIVE)
4709                         break;
4710 
4711                 list_for_each_entry(tgt, &vhost->targets, queue) {
4712                         if (tgt->add_rport) {
4713                                 did_work = 1;
4714                                 tgt->add_rport = 0;
4715                                 kref_get(&tgt->kref);
4716                                 rport = tgt->rport;
4717                                 if (!rport) {
4718                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4719                                         ibmvfc_tgt_add_rport(tgt);
4720                                 } else if (get_device(&rport->dev)) {
4721                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4722                                         tgt_dbg(tgt, "Setting rport roles\n");
4723                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4724                                         put_device(&rport->dev);
4725                                 }
4726 
4727                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4728                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4729                                 break;
4730                         }
4731                 }
4732         } while(did_work);
4733 
4734         if (vhost->state == IBMVFC_ACTIVE)
4735                 vhost->scan_complete = 1;
4736         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4737         LEAVE;
4738 }
4739 
4740 /**
4741  * ibmvfc_probe - Adapter hot plug add entry point
4742  * @vdev:       vio device struct
4743  * @id: vio device id struct
4744  *
4745  * Return value:
4746  *      0 on success / non-zero on failure
4747  **/
4748 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4749 {
4750         struct ibmvfc_host *vhost;
4751         struct Scsi_Host *shost;
4752         struct device *dev = &vdev->dev;
4753         int rc = -ENOMEM;
4754 
4755         ENTER;
4756         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4757         if (!shost) {
4758                 dev_err(dev, "Couldn't allocate host data\n");
4759                 goto out;
4760         }
4761 
4762         shost->transportt = ibmvfc_transport_template;
4763         shost->can_queue = max_requests;
4764         shost->max_lun = max_lun;
4765         shost->max_id = max_targets;
4766         shost->max_sectors = IBMVFC_MAX_SECTORS;
4767         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4768         shost->unique_id = shost->host_no;
4769 
4770         vhost = shost_priv(shost);
4771         INIT_LIST_HEAD(&vhost->sent);
4772         INIT_LIST_HEAD(&vhost->free);
4773         INIT_LIST_HEAD(&vhost->targets);
4774         sprintf(vhost->name, IBMVFC_NAME);
4775         vhost->host = shost;
4776         vhost->dev = dev;
4777         vhost->partition_number = -1;
4778         vhost->log_level = log_level;
4779         vhost->task_set = 1;
4780         strcpy(vhost->partition_name, "UNKNOWN");
4781         init_waitqueue_head(&vhost->work_wait_q);
4782         init_waitqueue_head(&vhost->init_wait_q);
4783         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4784         mutex_init(&vhost->passthru_mutex);
4785 
4786         if ((rc = ibmvfc_alloc_mem(vhost)))
4787                 goto free_scsi_host;
4788 
4789         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4790                                          shost->host_no);
4791 
4792         if (IS_ERR(vhost->work_thread)) {
4793                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4794                         PTR_ERR(vhost->work_thread));
4795                 goto free_host_mem;
4796         }
4797 
4798         if ((rc = ibmvfc_init_crq(vhost))) {
4799                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4800                 goto kill_kthread;
4801         }
4802 
4803         if ((rc = ibmvfc_init_event_pool(vhost))) {
4804                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4805                 goto release_crq;
4806         }
4807 
4808         if ((rc = scsi_add_host(shost, dev)))
4809                 goto release_event_pool;
4810 
4811         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4812 
4813         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4814                                            &ibmvfc_trace_attr))) {
4815                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4816                 goto remove_shost;
4817         }
4818 
4819         if (shost_to_fc_host(shost)->rqst_q)
4820                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4821         dev_set_drvdata(dev, vhost);
4822         spin_lock(&ibmvfc_driver_lock);
4823         list_add_tail(&vhost->queue, &ibmvfc_head);
4824         spin_unlock(&ibmvfc_driver_lock);
4825 
4826         ibmvfc_send_crq_init(vhost);
4827         scsi_scan_host(shost);
4828         return 0;
4829 
4830 remove_shost:
4831         scsi_remove_host(shost);
4832 release_event_pool:
4833         ibmvfc_free_event_pool(vhost);
4834 release_crq:
4835         ibmvfc_release_crq_queue(vhost);
4836 kill_kthread:
4837         kthread_stop(vhost->work_thread);
4838 free_host_mem:
4839         ibmvfc_free_mem(vhost);
4840 free_scsi_host:
4841         scsi_host_put(shost);
4842 out:
4843         LEAVE;
4844         return rc;
4845 }
4846 
4847 /**
4848  * ibmvfc_remove - Adapter hot plug remove entry point
4849  * @vdev:       vio device struct
4850  *
4851  * Return value:
4852  *      0
4853  **/
4854 static int ibmvfc_remove(struct vio_dev *vdev)
4855 {
4856         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4857         unsigned long flags;
4858 
4859         ENTER;
4860         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4861 
4862         spin_lock_irqsave(vhost->host->host_lock, flags);
4863         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4864         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4865 
4866         ibmvfc_wait_while_resetting(vhost);
4867         ibmvfc_release_crq_queue(vhost);
4868         kthread_stop(vhost->work_thread);
4869         fc_remove_host(vhost->host);
4870         scsi_remove_host(vhost->host);
4871 
4872         spin_lock_irqsave(vhost->host->host_lock, flags);
4873         ibmvfc_purge_requests(vhost, DID_ERROR);
4874         ibmvfc_free_event_pool(vhost);
4875         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4876 
4877         ibmvfc_free_mem(vhost);
4878         spin_lock(&ibmvfc_driver_lock);
4879         list_del(&vhost->queue);
4880         spin_unlock(&ibmvfc_driver_lock);
4881         scsi_host_put(vhost->host);
4882         LEAVE;
4883         return 0;
4884 }
4885 
4886 /**
4887  * ibmvfc_resume - Resume from suspend
4888  * @dev:        device struct
4889  *
4890  * We may have lost an interrupt across suspend/resume, so kick the
4891  * interrupt handler
4892  *
4893  */
4894 static int ibmvfc_resume(struct device *dev)
4895 {
4896         unsigned long flags;
4897         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4898         struct vio_dev *vdev = to_vio_dev(dev);
4899 
4900         spin_lock_irqsave(vhost->host->host_lock, flags);
4901         vio_disable_interrupts(vdev);
4902         tasklet_schedule(&vhost->tasklet);
4903         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4904         return 0;
4905 }
4906 
4907 /**
4908  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4909  * @vdev:       vio device struct
4910  *
4911  * Return value:
4912  *      Number of bytes the driver will need to DMA map at the same time in
4913  *      order to perform well.
4914  */
4915 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4916 {
4917         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4918         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4919 }
4920 
4921 static struct vio_device_id ibmvfc_device_table[] = {
4922         {"fcp", "IBM,vfc-client"},
4923         { "", "" }
4924 };
4925 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4926 
4927 static struct dev_pm_ops ibmvfc_pm_ops = {
4928         .resume = ibmvfc_resume
4929 };
4930 
4931 static struct vio_driver ibmvfc_driver = {
4932         .id_table = ibmvfc_device_table,
4933         .probe = ibmvfc_probe,
4934         .remove = ibmvfc_remove,
4935         .get_desired_dma = ibmvfc_get_desired_dma,
4936         .name = IBMVFC_NAME,
4937         .pm = &ibmvfc_pm_ops,
4938 };
4939 
4940 static struct fc_function_template ibmvfc_transport_functions = {
4941         .show_host_fabric_name = 1,
4942         .show_host_node_name = 1,
4943         .show_host_port_name = 1,
4944         .show_host_supported_classes = 1,
4945         .show_host_port_type = 1,
4946         .show_host_port_id = 1,
4947         .show_host_maxframe_size = 1,
4948 
4949         .get_host_port_state = ibmvfc_get_host_port_state,
4950         .show_host_port_state = 1,
4951 
4952         .get_host_speed = ibmvfc_get_host_speed,
4953         .show_host_speed = 1,
4954 
4955         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4956         .terminate_rport_io = ibmvfc_terminate_rport_io,
4957 
4958         .show_rport_maxframe_size = 1,
4959         .show_rport_supported_classes = 1,
4960 
4961         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4962         .show_rport_dev_loss_tmo = 1,
4963 
4964         .get_starget_node_name = ibmvfc_get_starget_node_name,
4965         .show_starget_node_name = 1,
4966 
4967         .get_starget_port_name = ibmvfc_get_starget_port_name,
4968         .show_starget_port_name = 1,
4969 
4970         .get_starget_port_id = ibmvfc_get_starget_port_id,
4971         .show_starget_port_id = 1,
4972 
4973         .bsg_request = ibmvfc_bsg_request,
4974         .bsg_timeout = ibmvfc_bsg_timeout,
4975 };
4976 
4977 /**
4978  * ibmvfc_module_init - Initialize the ibmvfc module
4979  *
4980  * Return value:
4981  *      0 on success / other on failure
4982  **/
4983 static int __init ibmvfc_module_init(void)
4984 {
4985         int rc;
4986 
4987         if (!firmware_has_feature(FW_FEATURE_VIO))
4988                 return -ENODEV;
4989 
4990         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
4991                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
4992 
4993         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
4994         if (!ibmvfc_transport_template)
4995                 return -ENOMEM;
4996 
4997         rc = vio_register_driver(&ibmvfc_driver);
4998         if (rc)
4999                 fc_release_transport(ibmvfc_transport_template);
5000         return rc;
5001 }
5002 
5003 /**
5004  * ibmvfc_module_exit - Teardown the ibmvfc module
5005  *
5006  * Return value:
5007  *      nothing
5008  **/
5009 static void __exit ibmvfc_module_exit(void)
5010 {
5011         vio_unregister_driver(&ibmvfc_driver);
5012         fc_release_transport(ibmvfc_transport_template);
5013 }
5014 
5015 module_init(ibmvfc_module_init);
5016 module_exit(ibmvfc_module_exit);
5017 

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