Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

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 unsigned int cls3_error = IBMVFC_CLS3_ERROR;
 56 static LIST_HEAD(ibmvfc_head);
 57 static DEFINE_SPINLOCK(ibmvfc_driver_lock);
 58 static struct scsi_transport_template *ibmvfc_transport_template;
 59 
 60 MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
 61 MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
 62 MODULE_LICENSE("GPL");
 63 MODULE_VERSION(IBMVFC_DRIVER_VERSION);
 64 
 65 module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
 66 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
 67                  "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
 68 module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
 69 MODULE_PARM_DESC(default_timeout,
 70                  "Default timeout in seconds for initialization and EH commands. "
 71                  "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
 72 module_param_named(max_requests, max_requests, uint, S_IRUGO);
 73 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
 74                  "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
 75 module_param_named(max_lun, max_lun, ullong, S_IRUGO);
 76 MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
 77                  "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
 78 module_param_named(max_targets, max_targets, uint, S_IRUGO);
 79 MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
 80                  "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
 81 module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
 82 MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
 83                  "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
 84 module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
 85 MODULE_PARM_DESC(debug, "Enable driver debug information. "
 86                  "[Default=" __stringify(IBMVFC_DEBUG) "]");
 87 module_param_named(log_level, log_level, uint, 0);
 88 MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
 89                  "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
 90 module_param_named(cls3_error, cls3_error, uint, 0);
 91 MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
 92                  "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
 93 
 94 static const struct {
 95         u16 status;
 96         u16 error;
 97         u8 result;
 98         u8 retry;
 99         int log;
100         char *name;
101 } cmd_status [] = {
102         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
103         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
104         { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
105         { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
106         { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
107         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
108         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
109         { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
110         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
111         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
112         { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
113         { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
114         { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
115         { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
116 
117         { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
118         { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
119         { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
120         { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
121         { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
122         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
123         { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
124         { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
125         { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
126         { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
127 
128         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
129         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
130         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
131         { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
132         { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
133         { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
134         { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
135         { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
136         { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
137         { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
138         { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
139 
140         { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
141 };
142 
143 static void ibmvfc_npiv_login(struct ibmvfc_host *);
144 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
145 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
146 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
147 static void ibmvfc_npiv_logout(struct ibmvfc_host *);
148 
149 static const char *unknown_error = "unknown error";
150 
151 #ifdef CONFIG_SCSI_IBMVFC_TRACE
152 /**
153  * ibmvfc_trc_start - Log a start trace entry
154  * @evt:                ibmvfc event struct
155  *
156  **/
157 static void ibmvfc_trc_start(struct ibmvfc_event *evt)
158 {
159         struct ibmvfc_host *vhost = evt->vhost;
160         struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
161         struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
162         struct ibmvfc_trace_entry *entry;
163 
164         entry = &vhost->trace[vhost->trace_index++];
165         entry->evt = evt;
166         entry->time = jiffies;
167         entry->fmt = evt->crq.format;
168         entry->type = IBMVFC_TRC_START;
169 
170         switch (entry->fmt) {
171         case IBMVFC_CMD_FORMAT:
172                 entry->op_code = vfc_cmd->iu.cdb[0];
173                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
174                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
175                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
176                 entry->u.start.xfer_len = be32_to_cpu(vfc_cmd->iu.xfer_len);
177                 break;
178         case IBMVFC_MAD_FORMAT:
179                 entry->op_code = be32_to_cpu(mad->opcode);
180                 break;
181         default:
182                 break;
183         };
184 }
185 
186 /**
187  * ibmvfc_trc_end - Log an end trace entry
188  * @evt:                ibmvfc event struct
189  *
190  **/
191 static void ibmvfc_trc_end(struct ibmvfc_event *evt)
192 {
193         struct ibmvfc_host *vhost = evt->vhost;
194         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
195         struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
196         struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
197 
198         entry->evt = evt;
199         entry->time = jiffies;
200         entry->fmt = evt->crq.format;
201         entry->type = IBMVFC_TRC_END;
202 
203         switch (entry->fmt) {
204         case IBMVFC_CMD_FORMAT:
205                 entry->op_code = vfc_cmd->iu.cdb[0];
206                 entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
207                 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
208                 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
209                 entry->u.end.status = be16_to_cpu(vfc_cmd->status);
210                 entry->u.end.error = be16_to_cpu(vfc_cmd->error);
211                 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
212                 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
213                 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
214                 break;
215         case IBMVFC_MAD_FORMAT:
216                 entry->op_code = be32_to_cpu(mad->opcode);
217                 entry->u.end.status = be16_to_cpu(mad->status);
218                 break;
219         default:
220                 break;
221 
222         };
223 }
224 
225 #else
226 #define ibmvfc_trc_start(evt) do { } while (0)
227 #define ibmvfc_trc_end(evt) do { } while (0)
228 #endif
229 
230 /**
231  * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
232  * @status:             status / error class
233  * @error:              error
234  *
235  * Return value:
236  *      index into cmd_status / -EINVAL on failure
237  **/
238 static int ibmvfc_get_err_index(u16 status, u16 error)
239 {
240         int i;
241 
242         for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
243                 if ((cmd_status[i].status & status) == cmd_status[i].status &&
244                     cmd_status[i].error == error)
245                         return i;
246 
247         return -EINVAL;
248 }
249 
250 /**
251  * ibmvfc_get_cmd_error - Find the error description for the fcp response
252  * @status:             status / error class
253  * @error:              error
254  *
255  * Return value:
256  *      error description string
257  **/
258 static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
259 {
260         int rc = ibmvfc_get_err_index(status, error);
261         if (rc >= 0)
262                 return cmd_status[rc].name;
263         return unknown_error;
264 }
265 
266 /**
267  * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
268  * @vfc_cmd:    ibmvfc command struct
269  *
270  * Return value:
271  *      SCSI result value to return for completed command
272  **/
273 static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
274 {
275         int err;
276         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
277         int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
278 
279         if ((rsp->flags & FCP_RSP_LEN_VALID) &&
280             ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
281              rsp->data.info.rsp_code))
282                 return DID_ERROR << 16;
283 
284         err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
285         if (err >= 0)
286                 return rsp->scsi_status | (cmd_status[err].result << 16);
287         return rsp->scsi_status | (DID_ERROR << 16);
288 }
289 
290 /**
291  * ibmvfc_retry_cmd - Determine if error status is retryable
292  * @status:             status / error class
293  * @error:              error
294  *
295  * Return value:
296  *      1 if error should be retried / 0 if it should not
297  **/
298 static int ibmvfc_retry_cmd(u16 status, u16 error)
299 {
300         int rc = ibmvfc_get_err_index(status, error);
301 
302         if (rc >= 0)
303                 return cmd_status[rc].retry;
304         return 1;
305 }
306 
307 static const char *unknown_fc_explain = "unknown fc explain";
308 
309 static const struct {
310         u16 fc_explain;
311         char *name;
312 } ls_explain [] = {
313         { 0x00, "no additional explanation" },
314         { 0x01, "service parameter error - options" },
315         { 0x03, "service parameter error - initiator control" },
316         { 0x05, "service parameter error - recipient control" },
317         { 0x07, "service parameter error - received data field size" },
318         { 0x09, "service parameter error - concurrent seq" },
319         { 0x0B, "service parameter error - credit" },
320         { 0x0D, "invalid N_Port/F_Port_Name" },
321         { 0x0E, "invalid node/Fabric Name" },
322         { 0x0F, "invalid common service parameters" },
323         { 0x11, "invalid association header" },
324         { 0x13, "association header required" },
325         { 0x15, "invalid originator S_ID" },
326         { 0x17, "invalid OX_ID-RX-ID combination" },
327         { 0x19, "command (request) already in progress" },
328         { 0x1E, "N_Port Login requested" },
329         { 0x1F, "Invalid N_Port_ID" },
330 };
331 
332 static const struct {
333         u16 fc_explain;
334         char *name;
335 } gs_explain [] = {
336         { 0x00, "no additional explanation" },
337         { 0x01, "port identifier not registered" },
338         { 0x02, "port name not registered" },
339         { 0x03, "node name not registered" },
340         { 0x04, "class of service not registered" },
341         { 0x06, "initial process associator not registered" },
342         { 0x07, "FC-4 TYPEs not registered" },
343         { 0x08, "symbolic port name not registered" },
344         { 0x09, "symbolic node name not registered" },
345         { 0x0A, "port type not registered" },
346         { 0xF0, "authorization exception" },
347         { 0xF1, "authentication exception" },
348         { 0xF2, "data base full" },
349         { 0xF3, "data base empty" },
350         { 0xF4, "processing request" },
351         { 0xF5, "unable to verify connection" },
352         { 0xF6, "devices not in a common zone" },
353 };
354 
355 /**
356  * ibmvfc_get_ls_explain - Return the FC Explain description text
357  * @status:     FC Explain status
358  *
359  * Returns:
360  *      error string
361  **/
362 static const char *ibmvfc_get_ls_explain(u16 status)
363 {
364         int i;
365 
366         for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
367                 if (ls_explain[i].fc_explain == status)
368                         return ls_explain[i].name;
369 
370         return unknown_fc_explain;
371 }
372 
373 /**
374  * ibmvfc_get_gs_explain - Return the FC Explain description text
375  * @status:     FC Explain status
376  *
377  * Returns:
378  *      error string
379  **/
380 static const char *ibmvfc_get_gs_explain(u16 status)
381 {
382         int i;
383 
384         for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
385                 if (gs_explain[i].fc_explain == status)
386                         return gs_explain[i].name;
387 
388         return unknown_fc_explain;
389 }
390 
391 static const struct {
392         enum ibmvfc_fc_type fc_type;
393         char *name;
394 } fc_type [] = {
395         { IBMVFC_FABRIC_REJECT, "fabric reject" },
396         { IBMVFC_PORT_REJECT, "port reject" },
397         { IBMVFC_LS_REJECT, "ELS reject" },
398         { IBMVFC_FABRIC_BUSY, "fabric busy" },
399         { IBMVFC_PORT_BUSY, "port busy" },
400         { IBMVFC_BASIC_REJECT, "basic reject" },
401 };
402 
403 static const char *unknown_fc_type = "unknown fc type";
404 
405 /**
406  * ibmvfc_get_fc_type - Return the FC Type description text
407  * @status:     FC Type error status
408  *
409  * Returns:
410  *      error string
411  **/
412 static const char *ibmvfc_get_fc_type(u16 status)
413 {
414         int i;
415 
416         for (i = 0; i < ARRAY_SIZE(fc_type); i++)
417                 if (fc_type[i].fc_type == status)
418                         return fc_type[i].name;
419 
420         return unknown_fc_type;
421 }
422 
423 /**
424  * ibmvfc_set_tgt_action - Set the next init action for the target
425  * @tgt:                ibmvfc target struct
426  * @action:             action to perform
427  *
428  **/
429 static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
430                                   enum ibmvfc_target_action action)
431 {
432         switch (tgt->action) {
433         case IBMVFC_TGT_ACTION_DEL_RPORT:
434                 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
435                         tgt->action = action;
436         case IBMVFC_TGT_ACTION_DELETED_RPORT:
437                 break;
438         default:
439                 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
440                         tgt->add_rport = 0;
441                 tgt->action = action;
442                 break;
443         }
444 }
445 
446 /**
447  * ibmvfc_set_host_state - Set the state for the host
448  * @vhost:              ibmvfc host struct
449  * @state:              state to set host to
450  *
451  * Returns:
452  *      0 if state changed / non-zero if not changed
453  **/
454 static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
455                                   enum ibmvfc_host_state state)
456 {
457         int rc = 0;
458 
459         switch (vhost->state) {
460         case IBMVFC_HOST_OFFLINE:
461                 rc = -EINVAL;
462                 break;
463         default:
464                 vhost->state = state;
465                 break;
466         };
467 
468         return rc;
469 }
470 
471 /**
472  * ibmvfc_set_host_action - Set the next init action for the host
473  * @vhost:              ibmvfc host struct
474  * @action:             action to perform
475  *
476  **/
477 static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
478                                    enum ibmvfc_host_action action)
479 {
480         switch (action) {
481         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
482                 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
483                         vhost->action = action;
484                 break;
485         case IBMVFC_HOST_ACTION_LOGO_WAIT:
486                 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
487                         vhost->action = action;
488                 break;
489         case IBMVFC_HOST_ACTION_INIT_WAIT:
490                 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
491                         vhost->action = action;
492                 break;
493         case IBMVFC_HOST_ACTION_QUERY:
494                 switch (vhost->action) {
495                 case IBMVFC_HOST_ACTION_INIT_WAIT:
496                 case IBMVFC_HOST_ACTION_NONE:
497                 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
498                         vhost->action = action;
499                         break;
500                 default:
501                         break;
502                 };
503                 break;
504         case IBMVFC_HOST_ACTION_TGT_INIT:
505                 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
506                         vhost->action = action;
507                 break;
508         case IBMVFC_HOST_ACTION_INIT:
509         case IBMVFC_HOST_ACTION_TGT_DEL:
510                 switch (vhost->action) {
511                 case IBMVFC_HOST_ACTION_RESET:
512                 case IBMVFC_HOST_ACTION_REENABLE:
513                         break;
514                 default:
515                         vhost->action = action;
516                         break;
517                 };
518                 break;
519         case IBMVFC_HOST_ACTION_LOGO:
520         case IBMVFC_HOST_ACTION_QUERY_TGTS:
521         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
522         case IBMVFC_HOST_ACTION_NONE:
523         case IBMVFC_HOST_ACTION_RESET:
524         case IBMVFC_HOST_ACTION_REENABLE:
525         default:
526                 vhost->action = action;
527                 break;
528         };
529 }
530 
531 /**
532  * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
533  * @vhost:              ibmvfc host struct
534  *
535  * Return value:
536  *      nothing
537  **/
538 static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
539 {
540         if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
541                 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
542                         scsi_block_requests(vhost->host);
543                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
544                 }
545         } else
546                 vhost->reinit = 1;
547 
548         wake_up(&vhost->work_wait_q);
549 }
550 
551 /**
552  * ibmvfc_link_down - Handle a link down event from the adapter
553  * @vhost:      ibmvfc host struct
554  * @state:      ibmvfc host state to enter
555  *
556  **/
557 static void ibmvfc_link_down(struct ibmvfc_host *vhost,
558                              enum ibmvfc_host_state state)
559 {
560         struct ibmvfc_target *tgt;
561 
562         ENTER;
563         scsi_block_requests(vhost->host);
564         list_for_each_entry(tgt, &vhost->targets, queue)
565                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
566         ibmvfc_set_host_state(vhost, state);
567         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
568         vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
569         wake_up(&vhost->work_wait_q);
570         LEAVE;
571 }
572 
573 /**
574  * ibmvfc_init_host - Start host initialization
575  * @vhost:              ibmvfc host struct
576  *
577  * Return value:
578  *      nothing
579  **/
580 static void ibmvfc_init_host(struct ibmvfc_host *vhost)
581 {
582         struct ibmvfc_target *tgt;
583 
584         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
585                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
586                         dev_err(vhost->dev,
587                                 "Host initialization retries exceeded. Taking adapter offline\n");
588                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
589                         return;
590                 }
591         }
592 
593         if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
594                 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
595                 vhost->async_crq.cur = 0;
596 
597                 list_for_each_entry(tgt, &vhost->targets, queue)
598                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
599                 scsi_block_requests(vhost->host);
600                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
601                 vhost->job_step = ibmvfc_npiv_login;
602                 wake_up(&vhost->work_wait_q);
603         }
604 }
605 
606 /**
607  * ibmvfc_send_crq - Send a CRQ
608  * @vhost:      ibmvfc host struct
609  * @word1:      the first 64 bits of the data
610  * @word2:      the second 64 bits of the data
611  *
612  * Return value:
613  *      0 on success / other on failure
614  **/
615 static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
616 {
617         struct vio_dev *vdev = to_vio_dev(vhost->dev);
618         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
619 }
620 
621 /**
622  * ibmvfc_send_crq_init - Send a CRQ init message
623  * @vhost:      ibmvfc host struct
624  *
625  * Return value:
626  *      0 on success / other on failure
627  **/
628 static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
629 {
630         ibmvfc_dbg(vhost, "Sending CRQ init\n");
631         return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
632 }
633 
634 /**
635  * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
636  * @vhost:      ibmvfc host struct
637  *
638  * Return value:
639  *      0 on success / other on failure
640  **/
641 static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
642 {
643         ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
644         return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
645 }
646 
647 /**
648  * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
649  * @vhost:      ibmvfc host struct
650  *
651  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
652  * the crq with the hypervisor.
653  **/
654 static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
655 {
656         long rc = 0;
657         struct vio_dev *vdev = to_vio_dev(vhost->dev);
658         struct ibmvfc_crq_queue *crq = &vhost->crq;
659 
660         ibmvfc_dbg(vhost, "Releasing CRQ\n");
661         free_irq(vdev->irq, vhost);
662         tasklet_kill(&vhost->tasklet);
663         do {
664                 if (rc)
665                         msleep(100);
666                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
667         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
668 
669         vhost->state = IBMVFC_NO_CRQ;
670         vhost->logged_in = 0;
671         dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
672         free_page((unsigned long)crq->msgs);
673 }
674 
675 /**
676  * ibmvfc_reenable_crq_queue - reenables the CRQ
677  * @vhost:      ibmvfc host struct
678  *
679  * Return value:
680  *      0 on success / other on failure
681  **/
682 static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
683 {
684         int rc = 0;
685         struct vio_dev *vdev = to_vio_dev(vhost->dev);
686 
687         /* Re-enable the CRQ */
688         do {
689                 if (rc)
690                         msleep(100);
691                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
692         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
693 
694         if (rc)
695                 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
696 
697         return rc;
698 }
699 
700 /**
701  * ibmvfc_reset_crq - resets a crq after a failure
702  * @vhost:      ibmvfc host struct
703  *
704  * Return value:
705  *      0 on success / other on failure
706  **/
707 static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
708 {
709         int rc = 0;
710         unsigned long flags;
711         struct vio_dev *vdev = to_vio_dev(vhost->dev);
712         struct ibmvfc_crq_queue *crq = &vhost->crq;
713 
714         /* Close the CRQ */
715         do {
716                 if (rc)
717                         msleep(100);
718                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
719         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
720 
721         spin_lock_irqsave(vhost->host->host_lock, flags);
722         vhost->state = IBMVFC_NO_CRQ;
723         vhost->logged_in = 0;
724 
725         /* Clean out the queue */
726         memset(crq->msgs, 0, PAGE_SIZE);
727         crq->cur = 0;
728 
729         /* And re-open it again */
730         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
731                                 crq->msg_token, PAGE_SIZE);
732 
733         if (rc == H_CLOSED)
734                 /* Adapter is good, but other end is not ready */
735                 dev_warn(vhost->dev, "Partner adapter not ready\n");
736         else if (rc != 0)
737                 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
738         spin_unlock_irqrestore(vhost->host->host_lock, flags);
739 
740         return rc;
741 }
742 
743 /**
744  * ibmvfc_valid_event - Determines if event is valid.
745  * @pool:       event_pool that contains the event
746  * @evt:        ibmvfc event to be checked for validity
747  *
748  * Return value:
749  *      1 if event is valid / 0 if event is not valid
750  **/
751 static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
752                               struct ibmvfc_event *evt)
753 {
754         int index = evt - pool->events;
755         if (index < 0 || index >= pool->size)   /* outside of bounds */
756                 return 0;
757         if (evt != pool->events + index)        /* unaligned */
758                 return 0;
759         return 1;
760 }
761 
762 /**
763  * ibmvfc_free_event - Free the specified event
764  * @evt:        ibmvfc_event to be freed
765  *
766  **/
767 static void ibmvfc_free_event(struct ibmvfc_event *evt)
768 {
769         struct ibmvfc_host *vhost = evt->vhost;
770         struct ibmvfc_event_pool *pool = &vhost->pool;
771 
772         BUG_ON(!ibmvfc_valid_event(pool, evt));
773         BUG_ON(atomic_inc_return(&evt->free) != 1);
774         list_add_tail(&evt->queue, &vhost->free);
775 }
776 
777 /**
778  * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
779  * @evt:        ibmvfc event struct
780  *
781  * This function does not setup any error status, that must be done
782  * before this function gets called.
783  **/
784 static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
785 {
786         struct scsi_cmnd *cmnd = evt->cmnd;
787 
788         if (cmnd) {
789                 scsi_dma_unmap(cmnd);
790                 cmnd->scsi_done(cmnd);
791         }
792 
793         if (evt->eh_comp)
794                 complete(evt->eh_comp);
795 
796         ibmvfc_free_event(evt);
797 }
798 
799 /**
800  * ibmvfc_fail_request - Fail request with specified error code
801  * @evt:                ibmvfc event struct
802  * @error_code: error code to fail request with
803  *
804  * Return value:
805  *      none
806  **/
807 static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
808 {
809         if (evt->cmnd) {
810                 evt->cmnd->result = (error_code << 16);
811                 evt->done = ibmvfc_scsi_eh_done;
812         } else
813                 evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
814 
815         list_del(&evt->queue);
816         del_timer(&evt->timer);
817         ibmvfc_trc_end(evt);
818         evt->done(evt);
819 }
820 
821 /**
822  * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
823  * @vhost:              ibmvfc host struct
824  * @error_code: error code to fail requests with
825  *
826  * Return value:
827  *      none
828  **/
829 static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
830 {
831         struct ibmvfc_event *evt, *pos;
832 
833         ibmvfc_dbg(vhost, "Purging all requests\n");
834         list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
835                 ibmvfc_fail_request(evt, error_code);
836 }
837 
838 /**
839  * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
840  * @vhost:      struct ibmvfc host to reset
841  **/
842 static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
843 {
844         ibmvfc_purge_requests(vhost, DID_ERROR);
845         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
846         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
847 }
848 
849 /**
850  * __ibmvfc_reset_host - Reset the connection to the server (no locking)
851  * @vhost:      struct ibmvfc host to reset
852  **/
853 static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
854 {
855         if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
856             !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
857                 scsi_block_requests(vhost->host);
858                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
859                 vhost->job_step = ibmvfc_npiv_logout;
860                 wake_up(&vhost->work_wait_q);
861         } else
862                 ibmvfc_hard_reset_host(vhost);
863 }
864 
865 /**
866  * ibmvfc_reset_host - Reset the connection to the server
867  * @vhost:      ibmvfc host struct
868  **/
869 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
870 {
871         unsigned long flags;
872 
873         spin_lock_irqsave(vhost->host->host_lock, flags);
874         __ibmvfc_reset_host(vhost);
875         spin_unlock_irqrestore(vhost->host->host_lock, flags);
876 }
877 
878 /**
879  * ibmvfc_retry_host_init - Retry host initialization if allowed
880  * @vhost:      ibmvfc host struct
881  *
882  * Returns: 1 if init will be retried / 0 if not
883  *
884  **/
885 static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
886 {
887         int retry = 0;
888 
889         if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
890                 vhost->delay_init = 1;
891                 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
892                         dev_err(vhost->dev,
893                                 "Host initialization retries exceeded. Taking adapter offline\n");
894                         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
895                 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
896                         __ibmvfc_reset_host(vhost);
897                 else {
898                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
899                         retry = 1;
900                 }
901         }
902 
903         wake_up(&vhost->work_wait_q);
904         return retry;
905 }
906 
907 /**
908  * __ibmvfc_get_target - Find the specified scsi_target (no locking)
909  * @starget:    scsi target struct
910  *
911  * Return value:
912  *      ibmvfc_target struct / NULL if not found
913  **/
914 static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
915 {
916         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
917         struct ibmvfc_host *vhost = shost_priv(shost);
918         struct ibmvfc_target *tgt;
919 
920         list_for_each_entry(tgt, &vhost->targets, queue)
921                 if (tgt->target_id == starget->id) {
922                         kref_get(&tgt->kref);
923                         return tgt;
924                 }
925         return NULL;
926 }
927 
928 /**
929  * ibmvfc_get_target - Find the specified scsi_target
930  * @starget:    scsi target struct
931  *
932  * Return value:
933  *      ibmvfc_target struct / NULL if not found
934  **/
935 static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
936 {
937         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
938         struct ibmvfc_target *tgt;
939         unsigned long flags;
940 
941         spin_lock_irqsave(shost->host_lock, flags);
942         tgt = __ibmvfc_get_target(starget);
943         spin_unlock_irqrestore(shost->host_lock, flags);
944         return tgt;
945 }
946 
947 /**
948  * ibmvfc_get_host_speed - Get host port speed
949  * @shost:              scsi host struct
950  *
951  * Return value:
952  *      none
953  **/
954 static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
955 {
956         struct ibmvfc_host *vhost = shost_priv(shost);
957         unsigned long flags;
958 
959         spin_lock_irqsave(shost->host_lock, flags);
960         if (vhost->state == IBMVFC_ACTIVE) {
961                 switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
962                 case 1:
963                         fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
964                         break;
965                 case 2:
966                         fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
967                         break;
968                 case 4:
969                         fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
970                         break;
971                 case 8:
972                         fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
973                         break;
974                 case 10:
975                         fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
976                         break;
977                 case 16:
978                         fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
979                         break;
980                 default:
981                         ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
982                                    be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
983                         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
984                         break;
985                 }
986         } else
987                 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
988         spin_unlock_irqrestore(shost->host_lock, flags);
989 }
990 
991 /**
992  * ibmvfc_get_host_port_state - Get host port state
993  * @shost:              scsi host struct
994  *
995  * Return value:
996  *      none
997  **/
998 static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
999 {
1000         struct ibmvfc_host *vhost = shost_priv(shost);
1001         unsigned long flags;
1002 
1003         spin_lock_irqsave(shost->host_lock, flags);
1004         switch (vhost->state) {
1005         case IBMVFC_INITIALIZING:
1006         case IBMVFC_ACTIVE:
1007                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1008                 break;
1009         case IBMVFC_LINK_DOWN:
1010                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1011                 break;
1012         case IBMVFC_LINK_DEAD:
1013         case IBMVFC_HOST_OFFLINE:
1014                 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1015                 break;
1016         case IBMVFC_HALTED:
1017                 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1018                 break;
1019         case IBMVFC_NO_CRQ:
1020                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1021                 break;
1022         default:
1023                 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1024                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1025                 break;
1026         }
1027         spin_unlock_irqrestore(shost->host_lock, flags);
1028 }
1029 
1030 /**
1031  * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1032  * @rport:              rport struct
1033  * @timeout:    timeout value
1034  *
1035  * Return value:
1036  *      none
1037  **/
1038 static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1039 {
1040         if (timeout)
1041                 rport->dev_loss_tmo = timeout;
1042         else
1043                 rport->dev_loss_tmo = 1;
1044 }
1045 
1046 /**
1047  * ibmvfc_release_tgt - Free memory allocated for a target
1048  * @kref:               kref struct
1049  *
1050  **/
1051 static void ibmvfc_release_tgt(struct kref *kref)
1052 {
1053         struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1054         kfree(tgt);
1055 }
1056 
1057 /**
1058  * ibmvfc_get_starget_node_name - Get SCSI target's node name
1059  * @starget:    scsi target struct
1060  *
1061  * Return value:
1062  *      none
1063  **/
1064 static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1065 {
1066         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1067         fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1068         if (tgt)
1069                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1070 }
1071 
1072 /**
1073  * ibmvfc_get_starget_port_name - Get SCSI target's port name
1074  * @starget:    scsi target struct
1075  *
1076  * Return value:
1077  *      none
1078  **/
1079 static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1080 {
1081         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1082         fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1083         if (tgt)
1084                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1085 }
1086 
1087 /**
1088  * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1089  * @starget:    scsi target struct
1090  *
1091  * Return value:
1092  *      none
1093  **/
1094 static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1095 {
1096         struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1097         fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1098         if (tgt)
1099                 kref_put(&tgt->kref, ibmvfc_release_tgt);
1100 }
1101 
1102 /**
1103  * ibmvfc_wait_while_resetting - Wait while the host resets
1104  * @vhost:              ibmvfc host struct
1105  *
1106  * Return value:
1107  *      0 on success / other on failure
1108  **/
1109 static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1110 {
1111         long timeout = wait_event_timeout(vhost->init_wait_q,
1112                                           ((vhost->state == IBMVFC_ACTIVE ||
1113                                             vhost->state == IBMVFC_HOST_OFFLINE ||
1114                                             vhost->state == IBMVFC_LINK_DEAD) &&
1115                                            vhost->action == IBMVFC_HOST_ACTION_NONE),
1116                                           (init_timeout * HZ));
1117 
1118         return timeout ? 0 : -EIO;
1119 }
1120 
1121 /**
1122  * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1123  * @shost:              scsi host struct
1124  *
1125  * Return value:
1126  *      0 on success / other on failure
1127  **/
1128 static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1129 {
1130         struct ibmvfc_host *vhost = shost_priv(shost);
1131 
1132         dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1133         ibmvfc_reset_host(vhost);
1134         return ibmvfc_wait_while_resetting(vhost);
1135 }
1136 
1137 /**
1138  * ibmvfc_gather_partition_info - Gather info about the LPAR
1139  *
1140  * Return value:
1141  *      none
1142  **/
1143 static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1144 {
1145         struct device_node *rootdn;
1146         const char *name;
1147         const unsigned int *num;
1148 
1149         rootdn = of_find_node_by_path("/");
1150         if (!rootdn)
1151                 return;
1152 
1153         name = of_get_property(rootdn, "ibm,partition-name", NULL);
1154         if (name)
1155                 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1156         num = of_get_property(rootdn, "ibm,partition-no", NULL);
1157         if (num)
1158                 vhost->partition_number = *num;
1159         of_node_put(rootdn);
1160 }
1161 
1162 /**
1163  * ibmvfc_set_login_info - Setup info for NPIV login
1164  * @vhost:      ibmvfc host struct
1165  *
1166  * Return value:
1167  *      none
1168  **/
1169 static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1170 {
1171         struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1172         struct device_node *of_node = vhost->dev->of_node;
1173         const char *location;
1174 
1175         memset(login_info, 0, sizeof(*login_info));
1176 
1177         login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1178         login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1179         login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1180         login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1181         login_info->partition_num = cpu_to_be32(vhost->partition_number);
1182         login_info->vfc_frame_version = cpu_to_be32(1);
1183         login_info->fcp_version = cpu_to_be16(3);
1184         login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1185         if (vhost->client_migrated)
1186                 login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1187 
1188         login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
1189         login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE);
1190         login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1191         login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
1192         strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1193         strncpy(login_info->device_name,
1194                 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1195 
1196         location = of_get_property(of_node, "ibm,loc-code", NULL);
1197         location = location ? location : dev_name(vhost->dev);
1198         strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1199 }
1200 
1201 /**
1202  * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1203  * @vhost:      ibmvfc host who owns the event pool
1204  *
1205  * Returns zero on success.
1206  **/
1207 static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1208 {
1209         int i;
1210         struct ibmvfc_event_pool *pool = &vhost->pool;
1211 
1212         ENTER;
1213         pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1214         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1215         if (!pool->events)
1216                 return -ENOMEM;
1217 
1218         pool->iu_storage = dma_alloc_coherent(vhost->dev,
1219                                               pool->size * sizeof(*pool->iu_storage),
1220                                               &pool->iu_token, 0);
1221 
1222         if (!pool->iu_storage) {
1223                 kfree(pool->events);
1224                 return -ENOMEM;
1225         }
1226 
1227         for (i = 0; i < pool->size; ++i) {
1228                 struct ibmvfc_event *evt = &pool->events[i];
1229                 atomic_set(&evt->free, 1);
1230                 evt->crq.valid = 0x80;
1231                 evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
1232                 evt->xfer_iu = pool->iu_storage + i;
1233                 evt->vhost = vhost;
1234                 evt->ext_list = NULL;
1235                 list_add_tail(&evt->queue, &vhost->free);
1236         }
1237 
1238         LEAVE;
1239         return 0;
1240 }
1241 
1242 /**
1243  * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1244  * @vhost:      ibmvfc host who owns the event pool
1245  *
1246  **/
1247 static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1248 {
1249         int i;
1250         struct ibmvfc_event_pool *pool = &vhost->pool;
1251 
1252         ENTER;
1253         for (i = 0; i < pool->size; ++i) {
1254                 list_del(&pool->events[i].queue);
1255                 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1256                 if (pool->events[i].ext_list)
1257                         dma_pool_free(vhost->sg_pool,
1258                                       pool->events[i].ext_list,
1259                                       pool->events[i].ext_list_token);
1260         }
1261 
1262         kfree(pool->events);
1263         dma_free_coherent(vhost->dev,
1264                           pool->size * sizeof(*pool->iu_storage),
1265                           pool->iu_storage, pool->iu_token);
1266         LEAVE;
1267 }
1268 
1269 /**
1270  * ibmvfc_get_event - Gets the next free event in pool
1271  * @vhost:      ibmvfc host struct
1272  *
1273  * Returns a free event from the pool.
1274  **/
1275 static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1276 {
1277         struct ibmvfc_event *evt;
1278 
1279         BUG_ON(list_empty(&vhost->free));
1280         evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1281         atomic_set(&evt->free, 0);
1282         list_del(&evt->queue);
1283         return evt;
1284 }
1285 
1286 /**
1287  * ibmvfc_init_event - Initialize fields in an event struct that are always
1288  *                              required.
1289  * @evt:        The event
1290  * @done:       Routine to call when the event is responded to
1291  * @format:     SRP or MAD format
1292  **/
1293 static void ibmvfc_init_event(struct ibmvfc_event *evt,
1294                               void (*done) (struct ibmvfc_event *), u8 format)
1295 {
1296         evt->cmnd = NULL;
1297         evt->sync_iu = NULL;
1298         evt->crq.format = format;
1299         evt->done = done;
1300         evt->eh_comp = NULL;
1301 }
1302 
1303 /**
1304  * ibmvfc_map_sg_list - Initialize scatterlist
1305  * @scmd:       scsi command struct
1306  * @nseg:       number of scatterlist segments
1307  * @md: memory descriptor list to initialize
1308  **/
1309 static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1310                                struct srp_direct_buf *md)
1311 {
1312         int i;
1313         struct scatterlist *sg;
1314 
1315         scsi_for_each_sg(scmd, sg, nseg, i) {
1316                 md[i].va = cpu_to_be64(sg_dma_address(sg));
1317                 md[i].len = cpu_to_be32(sg_dma_len(sg));
1318                 md[i].key = 0;
1319         }
1320 }
1321 
1322 /**
1323  * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1324  * @scmd:               Scsi_Cmnd with the scatterlist
1325  * @evt:                ibmvfc event struct
1326  * @vfc_cmd:    vfc_cmd that contains the memory descriptor
1327  * @dev:                device for which to map dma memory
1328  *
1329  * Returns:
1330  *      0 on success / non-zero on failure
1331  **/
1332 static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1333                               struct ibmvfc_event *evt,
1334                               struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1335 {
1336 
1337         int sg_mapped;
1338         struct srp_direct_buf *data = &vfc_cmd->ioba;
1339         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1340 
1341         if (cls3_error)
1342                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1343 
1344         sg_mapped = scsi_dma_map(scmd);
1345         if (!sg_mapped) {
1346                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1347                 return 0;
1348         } else if (unlikely(sg_mapped < 0)) {
1349                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1350                         scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1351                 return sg_mapped;
1352         }
1353 
1354         if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1355                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1356                 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1357         } else {
1358                 vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1359                 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1360         }
1361 
1362         if (sg_mapped == 1) {
1363                 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1364                 return 0;
1365         }
1366 
1367         vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1368 
1369         if (!evt->ext_list) {
1370                 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1371                                                &evt->ext_list_token);
1372 
1373                 if (!evt->ext_list) {
1374                         scsi_dma_unmap(scmd);
1375                         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1376                                 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1377                         return -ENOMEM;
1378                 }
1379         }
1380 
1381         ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1382 
1383         data->va = cpu_to_be64(evt->ext_list_token);
1384         data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1385         data->key = 0;
1386         return 0;
1387 }
1388 
1389 /**
1390  * ibmvfc_timeout - Internal command timeout handler
1391  * @evt:        struct ibmvfc_event that timed out
1392  *
1393  * Called when an internally generated command times out
1394  **/
1395 static void ibmvfc_timeout(struct ibmvfc_event *evt)
1396 {
1397         struct ibmvfc_host *vhost = evt->vhost;
1398         dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1399         ibmvfc_reset_host(vhost);
1400 }
1401 
1402 /**
1403  * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1404  * @evt:                event to be sent
1405  * @vhost:              ibmvfc host struct
1406  * @timeout:    timeout in seconds - 0 means do not time command
1407  *
1408  * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1409  **/
1410 static int ibmvfc_send_event(struct ibmvfc_event *evt,
1411                              struct ibmvfc_host *vhost, unsigned long timeout)
1412 {
1413         __be64 *crq_as_u64 = (__be64 *) &evt->crq;
1414         int rc;
1415 
1416         /* Copy the IU into the transfer area */
1417         *evt->xfer_iu = evt->iu;
1418         if (evt->crq.format == IBMVFC_CMD_FORMAT)
1419                 evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1420         else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1421                 evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1422         else
1423                 BUG();
1424 
1425         list_add_tail(&evt->queue, &vhost->sent);
1426         init_timer(&evt->timer);
1427 
1428         if (timeout) {
1429                 evt->timer.data = (unsigned long) evt;
1430                 evt->timer.expires = jiffies + (timeout * HZ);
1431                 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1432                 add_timer(&evt->timer);
1433         }
1434 
1435         mb();
1436 
1437         if ((rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1438                                   be64_to_cpu(crq_as_u64[1])))) {
1439                 list_del(&evt->queue);
1440                 del_timer(&evt->timer);
1441 
1442                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1443                  * Firmware will send a CRQ with a transport event (0xFF) to
1444                  * tell this client what has happened to the transport. This
1445                  * will be handled in ibmvfc_handle_crq()
1446                  */
1447                 if (rc == H_CLOSED) {
1448                         if (printk_ratelimit())
1449                                 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1450                         if (evt->cmnd)
1451                                 scsi_dma_unmap(evt->cmnd);
1452                         ibmvfc_free_event(evt);
1453                         return SCSI_MLQUEUE_HOST_BUSY;
1454                 }
1455 
1456                 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1457                 if (evt->cmnd) {
1458                         evt->cmnd->result = DID_ERROR << 16;
1459                         evt->done = ibmvfc_scsi_eh_done;
1460                 } else
1461                         evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1462 
1463                 evt->done(evt);
1464         } else
1465                 ibmvfc_trc_start(evt);
1466 
1467         return 0;
1468 }
1469 
1470 /**
1471  * ibmvfc_log_error - Log an error for the failed command if appropriate
1472  * @evt:        ibmvfc event to log
1473  *
1474  **/
1475 static void ibmvfc_log_error(struct ibmvfc_event *evt)
1476 {
1477         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1478         struct ibmvfc_host *vhost = evt->vhost;
1479         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1480         struct scsi_cmnd *cmnd = evt->cmnd;
1481         const char *err = unknown_error;
1482         int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1483         int logerr = 0;
1484         int rsp_code = 0;
1485 
1486         if (index >= 0) {
1487                 logerr = cmd_status[index].log;
1488                 err = cmd_status[index].name;
1489         }
1490 
1491         if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1492                 return;
1493 
1494         if (rsp->flags & FCP_RSP_LEN_VALID)
1495                 rsp_code = rsp->data.info.rsp_code;
1496 
1497         scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1498                     "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1499                     cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1500                     rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1501 }
1502 
1503 /**
1504  * ibmvfc_relogin - Log back into the specified device
1505  * @sdev:       scsi device struct
1506  *
1507  **/
1508 static void ibmvfc_relogin(struct scsi_device *sdev)
1509 {
1510         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1511         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1512         struct ibmvfc_target *tgt;
1513 
1514         list_for_each_entry(tgt, &vhost->targets, queue) {
1515                 if (rport == tgt->rport) {
1516                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1517                         break;
1518                 }
1519         }
1520 
1521         ibmvfc_reinit_host(vhost);
1522 }
1523 
1524 /**
1525  * ibmvfc_scsi_done - Handle responses from commands
1526  * @evt:        ibmvfc event to be handled
1527  *
1528  * Used as a callback when sending scsi cmds.
1529  **/
1530 static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1531 {
1532         struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1533         struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1534         struct scsi_cmnd *cmnd = evt->cmnd;
1535         u32 rsp_len = 0;
1536         u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1537 
1538         if (cmnd) {
1539                 if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1540                         scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1541                 else if (rsp->flags & FCP_RESID_UNDER)
1542                         scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1543                 else
1544                         scsi_set_resid(cmnd, 0);
1545 
1546                 if (vfc_cmd->status) {
1547                         cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1548 
1549                         if (rsp->flags & FCP_RSP_LEN_VALID)
1550                                 rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1551                         if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1552                                 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1553                         if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1554                                 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1555                         if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1556                             (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1557                                 ibmvfc_relogin(cmnd->device);
1558 
1559                         if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1560                                 cmnd->result = (DID_ERROR << 16);
1561 
1562                         ibmvfc_log_error(evt);
1563                 }
1564 
1565                 if (!cmnd->result &&
1566                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1567                         cmnd->result = (DID_ERROR << 16);
1568 
1569                 scsi_dma_unmap(cmnd);
1570                 cmnd->scsi_done(cmnd);
1571         }
1572 
1573         if (evt->eh_comp)
1574                 complete(evt->eh_comp);
1575 
1576         ibmvfc_free_event(evt);
1577 }
1578 
1579 /**
1580  * ibmvfc_host_chkready - Check if the host can accept commands
1581  * @vhost:       struct ibmvfc host
1582  *
1583  * Returns:
1584  *      1 if host can accept command / 0 if not
1585  **/
1586 static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1587 {
1588         int result = 0;
1589 
1590         switch (vhost->state) {
1591         case IBMVFC_LINK_DEAD:
1592         case IBMVFC_HOST_OFFLINE:
1593                 result = DID_NO_CONNECT << 16;
1594                 break;
1595         case IBMVFC_NO_CRQ:
1596         case IBMVFC_INITIALIZING:
1597         case IBMVFC_HALTED:
1598         case IBMVFC_LINK_DOWN:
1599                 result = DID_REQUEUE << 16;
1600                 break;
1601         case IBMVFC_ACTIVE:
1602                 result = 0;
1603                 break;
1604         };
1605 
1606         return result;
1607 }
1608 
1609 /**
1610  * ibmvfc_queuecommand - The queuecommand function of the scsi template
1611  * @cmnd:       struct scsi_cmnd to be executed
1612  * @done:       Callback function to be called when cmnd is completed
1613  *
1614  * Returns:
1615  *      0 on success / other on failure
1616  **/
1617 static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1618                                void (*done) (struct scsi_cmnd *))
1619 {
1620         struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1621         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1622         struct ibmvfc_cmd *vfc_cmd;
1623         struct ibmvfc_event *evt;
1624         int rc;
1625 
1626         if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1627             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1628                 cmnd->result = rc;
1629                 done(cmnd);
1630                 return 0;
1631         }
1632 
1633         cmnd->result = (DID_OK << 16);
1634         evt = ibmvfc_get_event(vhost);
1635         ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1636         evt->cmnd = cmnd;
1637         cmnd->scsi_done = done;
1638         vfc_cmd = &evt->iu.cmd;
1639         memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1640         vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1641         vfc_cmd->resp.len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1642         vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1643         vfc_cmd->payload_len = cpu_to_be32(sizeof(vfc_cmd->iu));
1644         vfc_cmd->resp_len = cpu_to_be32(sizeof(vfc_cmd->rsp));
1645         vfc_cmd->cancel_key = cpu_to_be32((unsigned long)cmnd->device->hostdata);
1646         vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1647         vfc_cmd->iu.xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1648         int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1649         memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1650 
1651         if (cmnd->flags & SCMD_TAGGED) {
1652                 vfc_cmd->task_tag = cpu_to_be64(cmnd->tag);
1653                 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1654         }
1655 
1656         if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1657                 return ibmvfc_send_event(evt, vhost, 0);
1658 
1659         ibmvfc_free_event(evt);
1660         if (rc == -ENOMEM)
1661                 return SCSI_MLQUEUE_HOST_BUSY;
1662 
1663         if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1664                 scmd_printk(KERN_ERR, cmnd,
1665                             "Failed to map DMA buffer for command. rc=%d\n", rc);
1666 
1667         cmnd->result = DID_ERROR << 16;
1668         done(cmnd);
1669         return 0;
1670 }
1671 
1672 static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1673 
1674 /**
1675  * ibmvfc_sync_completion - Signal that a synchronous command has completed
1676  * @evt:        ibmvfc event struct
1677  *
1678  **/
1679 static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1680 {
1681         /* copy the response back */
1682         if (evt->sync_iu)
1683                 *evt->sync_iu = *evt->xfer_iu;
1684 
1685         complete(&evt->comp);
1686 }
1687 
1688 /**
1689  * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1690  * @evt:        struct ibmvfc_event
1691  *
1692  **/
1693 static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1694 {
1695         struct ibmvfc_host *vhost = evt->vhost;
1696 
1697         ibmvfc_free_event(evt);
1698         vhost->aborting_passthru = 0;
1699         dev_info(vhost->dev, "Passthru command cancelled\n");
1700 }
1701 
1702 /**
1703  * ibmvfc_bsg_timeout - Handle a BSG timeout
1704  * @job:        struct fc_bsg_job that timed out
1705  *
1706  * Returns:
1707  *      0 on success / other on failure
1708  **/
1709 static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1710 {
1711         struct ibmvfc_host *vhost = shost_priv(job->shost);
1712         unsigned long port_id = (unsigned long)job->dd_data;
1713         struct ibmvfc_event *evt;
1714         struct ibmvfc_tmf *tmf;
1715         unsigned long flags;
1716         int rc;
1717 
1718         ENTER;
1719         spin_lock_irqsave(vhost->host->host_lock, flags);
1720         if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1721                 __ibmvfc_reset_host(vhost);
1722                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1723                 return 0;
1724         }
1725 
1726         vhost->aborting_passthru = 1;
1727         evt = ibmvfc_get_event(vhost);
1728         ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1729 
1730         tmf = &evt->iu.tmf;
1731         memset(tmf, 0, sizeof(*tmf));
1732         tmf->common.version = cpu_to_be32(1);
1733         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
1734         tmf->common.length = cpu_to_be16(sizeof(*tmf));
1735         tmf->scsi_id = cpu_to_be64(port_id);
1736         tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1737         tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
1738         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1739 
1740         if (rc != 0) {
1741                 vhost->aborting_passthru = 0;
1742                 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1743                 rc = -EIO;
1744         } else
1745                 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1746                          port_id);
1747 
1748         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1749 
1750         LEAVE;
1751         return rc;
1752 }
1753 
1754 /**
1755  * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1756  * @vhost:              struct ibmvfc_host to send command
1757  * @port_id:    port ID to send command
1758  *
1759  * Returns:
1760  *      0 on success / other on failure
1761  **/
1762 static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1763 {
1764         struct ibmvfc_port_login *plogi;
1765         struct ibmvfc_target *tgt;
1766         struct ibmvfc_event *evt;
1767         union ibmvfc_iu rsp_iu;
1768         unsigned long flags;
1769         int rc = 0, issue_login = 1;
1770 
1771         ENTER;
1772         spin_lock_irqsave(vhost->host->host_lock, flags);
1773         list_for_each_entry(tgt, &vhost->targets, queue) {
1774                 if (tgt->scsi_id == port_id) {
1775                         issue_login = 0;
1776                         break;
1777                 }
1778         }
1779 
1780         if (!issue_login)
1781                 goto unlock_out;
1782         if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1783                 goto unlock_out;
1784 
1785         evt = ibmvfc_get_event(vhost);
1786         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1787         plogi = &evt->iu.plogi;
1788         memset(plogi, 0, sizeof(*plogi));
1789         plogi->common.version = cpu_to_be32(1);
1790         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
1791         plogi->common.length = cpu_to_be16(sizeof(*plogi));
1792         plogi->scsi_id = cpu_to_be64(port_id);
1793         evt->sync_iu = &rsp_iu;
1794         init_completion(&evt->comp);
1795 
1796         rc = ibmvfc_send_event(evt, vhost, default_timeout);
1797         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1798 
1799         if (rc)
1800                 return -EIO;
1801 
1802         wait_for_completion(&evt->comp);
1803 
1804         if (rsp_iu.plogi.common.status)
1805                 rc = -EIO;
1806 
1807         spin_lock_irqsave(vhost->host->host_lock, flags);
1808         ibmvfc_free_event(evt);
1809 unlock_out:
1810         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1811         LEAVE;
1812         return rc;
1813 }
1814 
1815 /**
1816  * ibmvfc_bsg_request - Handle a BSG request
1817  * @job:        struct fc_bsg_job to be executed
1818  *
1819  * Returns:
1820  *      0 on success / other on failure
1821  **/
1822 static int ibmvfc_bsg_request(struct fc_bsg_job *job)
1823 {
1824         struct ibmvfc_host *vhost = shost_priv(job->shost);
1825         struct fc_rport *rport = job->rport;
1826         struct ibmvfc_passthru_mad *mad;
1827         struct ibmvfc_event *evt;
1828         union ibmvfc_iu rsp_iu;
1829         unsigned long flags, port_id = -1;
1830         unsigned int code = job->request->msgcode;
1831         int rc = 0, req_seg, rsp_seg, issue_login = 0;
1832         u32 fc_flags, rsp_len;
1833 
1834         ENTER;
1835         job->reply->reply_payload_rcv_len = 0;
1836         if (rport)
1837                 port_id = rport->port_id;
1838 
1839         switch (code) {
1840         case FC_BSG_HST_ELS_NOLOGIN:
1841                 port_id = (job->request->rqst_data.h_els.port_id[0] << 16) |
1842                         (job->request->rqst_data.h_els.port_id[1] << 8) |
1843                         job->request->rqst_data.h_els.port_id[2];
1844         case FC_BSG_RPT_ELS:
1845                 fc_flags = IBMVFC_FC_ELS;
1846                 break;
1847         case FC_BSG_HST_CT:
1848                 issue_login = 1;
1849                 port_id = (job->request->rqst_data.h_ct.port_id[0] << 16) |
1850                         (job->request->rqst_data.h_ct.port_id[1] << 8) |
1851                         job->request->rqst_data.h_ct.port_id[2];
1852         case FC_BSG_RPT_CT:
1853                 fc_flags = IBMVFC_FC_CT_IU;
1854                 break;
1855         default:
1856                 return -ENOTSUPP;
1857         };
1858 
1859         if (port_id == -1)
1860                 return -EINVAL;
1861         if (!mutex_trylock(&vhost->passthru_mutex))
1862                 return -EBUSY;
1863 
1864         job->dd_data = (void *)port_id;
1865         req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
1866                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1867 
1868         if (!req_seg) {
1869                 mutex_unlock(&vhost->passthru_mutex);
1870                 return -ENOMEM;
1871         }
1872 
1873         rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
1874                              job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1875 
1876         if (!rsp_seg) {
1877                 dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1878                              job->request_payload.sg_cnt, DMA_TO_DEVICE);
1879                 mutex_unlock(&vhost->passthru_mutex);
1880                 return -ENOMEM;
1881         }
1882 
1883         if (req_seg > 1 || rsp_seg > 1) {
1884                 rc = -EINVAL;
1885                 goto out;
1886         }
1887 
1888         if (issue_login)
1889                 rc = ibmvfc_bsg_plogi(vhost, port_id);
1890 
1891         spin_lock_irqsave(vhost->host->host_lock, flags);
1892 
1893         if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
1894             unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1895                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1896                 goto out;
1897         }
1898 
1899         evt = ibmvfc_get_event(vhost);
1900         ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
1901         mad = &evt->iu.passthru;
1902 
1903         memset(mad, 0, sizeof(*mad));
1904         mad->common.version = cpu_to_be32(1);
1905         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
1906         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
1907 
1908         mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
1909                 offsetof(struct ibmvfc_passthru_mad, iu));
1910         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
1911 
1912         mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
1913         mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
1914         mad->iu.flags = cpu_to_be32(fc_flags);
1915         mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
1916 
1917         mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
1918         mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
1919         mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
1920         mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
1921         mad->iu.scsi_id = cpu_to_be64(port_id);
1922         mad->iu.tag = cpu_to_be64((u64)evt);
1923         rsp_len = be32_to_cpu(mad->iu.rsp.len);
1924 
1925         evt->sync_iu = &rsp_iu;
1926         init_completion(&evt->comp);
1927         rc = ibmvfc_send_event(evt, vhost, 0);
1928         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1929 
1930         if (rc) {
1931                 rc = -EIO;
1932                 goto out;
1933         }
1934 
1935         wait_for_completion(&evt->comp);
1936 
1937         if (rsp_iu.passthru.common.status)
1938                 rc = -EIO;
1939         else
1940                 job->reply->reply_payload_rcv_len = rsp_len;
1941 
1942         spin_lock_irqsave(vhost->host->host_lock, flags);
1943         ibmvfc_free_event(evt);
1944         spin_unlock_irqrestore(vhost->host->host_lock, flags);
1945         job->reply->result = rc;
1946         job->job_done(job);
1947         rc = 0;
1948 out:
1949         dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
1950                      job->request_payload.sg_cnt, DMA_TO_DEVICE);
1951         dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
1952                      job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
1953         mutex_unlock(&vhost->passthru_mutex);
1954         LEAVE;
1955         return rc;
1956 }
1957 
1958 /**
1959  * ibmvfc_reset_device - Reset the device with the specified reset type
1960  * @sdev:       scsi device to reset
1961  * @type:       reset type
1962  * @desc:       reset type description for log messages
1963  *
1964  * Returns:
1965  *      0 on success / other on failure
1966  **/
1967 static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
1968 {
1969         struct ibmvfc_host *vhost = shost_priv(sdev->host);
1970         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1971         struct ibmvfc_cmd *tmf;
1972         struct ibmvfc_event *evt = NULL;
1973         union ibmvfc_iu rsp_iu;
1974         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
1975         int rsp_rc = -EBUSY;
1976         unsigned long flags;
1977         int rsp_code = 0;
1978 
1979         spin_lock_irqsave(vhost->host->host_lock, flags);
1980         if (vhost->state == IBMVFC_ACTIVE) {
1981                 evt = ibmvfc_get_event(vhost);
1982                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
1983 
1984                 tmf = &evt->iu.cmd;
1985                 memset(tmf, 0, sizeof(*tmf));
1986                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
1987                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
1988                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1989                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
1990                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
1991                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1992                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
1993                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
1994                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
1995                 tmf->iu.tmf_flags = type;
1996                 evt->sync_iu = &rsp_iu;
1997 
1998                 init_completion(&evt->comp);
1999                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2000         }
2001         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2002 
2003         if (rsp_rc != 0) {
2004                 sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2005                             desc, rsp_rc);
2006                 return -EIO;
2007         }
2008 
2009         sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2010         wait_for_completion(&evt->comp);
2011 
2012         if (rsp_iu.cmd.status)
2013                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2014 
2015         if (rsp_code) {
2016                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2017                         rsp_code = fc_rsp->data.info.rsp_code;
2018 
2019                 sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2020                             "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2021                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2022                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2023                             fc_rsp->scsi_status);
2024                 rsp_rc = -EIO;
2025         } else
2026                 sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2027 
2028         spin_lock_irqsave(vhost->host->host_lock, flags);
2029         ibmvfc_free_event(evt);
2030         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2031         return rsp_rc;
2032 }
2033 
2034 /**
2035  * ibmvfc_match_rport - Match function for specified remote port
2036  * @evt:        ibmvfc event struct
2037  * @device:     device to match (rport)
2038  *
2039  * Returns:
2040  *      1 if event matches rport / 0 if event does not match rport
2041  **/
2042 static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2043 {
2044         struct fc_rport *cmd_rport;
2045 
2046         if (evt->cmnd) {
2047                 cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2048                 if (cmd_rport == rport)
2049                         return 1;
2050         }
2051         return 0;
2052 }
2053 
2054 /**
2055  * ibmvfc_match_target - Match function for specified target
2056  * @evt:        ibmvfc event struct
2057  * @device:     device to match (starget)
2058  *
2059  * Returns:
2060  *      1 if event matches starget / 0 if event does not match starget
2061  **/
2062 static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2063 {
2064         if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2065                 return 1;
2066         return 0;
2067 }
2068 
2069 /**
2070  * ibmvfc_match_lun - Match function for specified LUN
2071  * @evt:        ibmvfc event struct
2072  * @device:     device to match (sdev)
2073  *
2074  * Returns:
2075  *      1 if event matches sdev / 0 if event does not match sdev
2076  **/
2077 static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2078 {
2079         if (evt->cmnd && evt->cmnd->device == device)
2080                 return 1;
2081         return 0;
2082 }
2083 
2084 /**
2085  * ibmvfc_wait_for_ops - Wait for ops to complete
2086  * @vhost:      ibmvfc host struct
2087  * @device:     device to match (starget or sdev)
2088  * @match:      match function
2089  *
2090  * Returns:
2091  *      SUCCESS / FAILED
2092  **/
2093 static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2094                                int (*match) (struct ibmvfc_event *, void *))
2095 {
2096         struct ibmvfc_event *evt;
2097         DECLARE_COMPLETION_ONSTACK(comp);
2098         int wait;
2099         unsigned long flags;
2100         signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2101 
2102         ENTER;
2103         do {
2104                 wait = 0;
2105                 spin_lock_irqsave(vhost->host->host_lock, flags);
2106                 list_for_each_entry(evt, &vhost->sent, queue) {
2107                         if (match(evt, device)) {
2108                                 evt->eh_comp = &comp;
2109                                 wait++;
2110                         }
2111                 }
2112                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2113 
2114                 if (wait) {
2115                         timeout = wait_for_completion_timeout(&comp, timeout);
2116 
2117                         if (!timeout) {
2118                                 wait = 0;
2119                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2120                                 list_for_each_entry(evt, &vhost->sent, queue) {
2121                                         if (match(evt, device)) {
2122                                                 evt->eh_comp = NULL;
2123                                                 wait++;
2124                                         }
2125                                 }
2126                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2127                                 if (wait)
2128                                         dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2129                                 LEAVE;
2130                                 return wait ? FAILED : SUCCESS;
2131                         }
2132                 }
2133         } while (wait);
2134 
2135         LEAVE;
2136         return SUCCESS;
2137 }
2138 
2139 /**
2140  * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2141  * @sdev:       scsi device to cancel commands
2142  * @type:       type of error recovery being performed
2143  *
2144  * This sends a cancel to the VIOS for the specified device. This does
2145  * NOT send any abort to the actual device. That must be done separately.
2146  *
2147  * Returns:
2148  *      0 on success / other on failure
2149  **/
2150 static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2151 {
2152         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2153         struct scsi_target *starget = scsi_target(sdev);
2154         struct fc_rport *rport = starget_to_rport(starget);
2155         struct ibmvfc_tmf *tmf;
2156         struct ibmvfc_event *evt, *found_evt;
2157         union ibmvfc_iu rsp;
2158         int rsp_rc = -EBUSY;
2159         unsigned long flags;
2160         u16 status;
2161 
2162         ENTER;
2163         spin_lock_irqsave(vhost->host->host_lock, flags);
2164         found_evt = NULL;
2165         list_for_each_entry(evt, &vhost->sent, queue) {
2166                 if (evt->cmnd && evt->cmnd->device == sdev) {
2167                         found_evt = evt;
2168                         break;
2169                 }
2170         }
2171 
2172         if (!found_evt) {
2173                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2174                         sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2175                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2176                 return 0;
2177         }
2178 
2179         if (vhost->logged_in) {
2180                 evt = ibmvfc_get_event(vhost);
2181                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2182 
2183                 tmf = &evt->iu.tmf;
2184                 memset(tmf, 0, sizeof(*tmf));
2185                 tmf->common.version = cpu_to_be32(1);
2186                 tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2187                 tmf->common.length = cpu_to_be16(sizeof(*tmf));
2188                 tmf->scsi_id = cpu_to_be64(rport->port_id);
2189                 int_to_scsilun(sdev->lun, &tmf->lun);
2190                 if (!(be64_to_cpu(vhost->login_buf->resp.capabilities) & IBMVFC_CAN_SUPPRESS_ABTS))
2191                         type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2192                 if (vhost->state == IBMVFC_ACTIVE)
2193                         tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2194                 else
2195                         tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2196                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2197                 tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2198 
2199                 evt->sync_iu = &rsp;
2200                 init_completion(&evt->comp);
2201                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2202         }
2203 
2204         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2205 
2206         if (rsp_rc != 0) {
2207                 sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2208                 /* If failure is received, the host adapter is most likely going
2209                  through reset, return success so the caller will wait for the command
2210                  being cancelled to get returned */
2211                 return 0;
2212         }
2213 
2214         sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2215 
2216         wait_for_completion(&evt->comp);
2217         status = be16_to_cpu(rsp.mad_common.status);
2218         spin_lock_irqsave(vhost->host->host_lock, flags);
2219         ibmvfc_free_event(evt);
2220         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2221 
2222         if (status != IBMVFC_MAD_SUCCESS) {
2223                 sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2224                 switch (status) {
2225                 case IBMVFC_MAD_DRIVER_FAILED:
2226                 case IBMVFC_MAD_CRQ_ERROR:
2227                         /* Host adapter most likely going through reset, return success to
2228                          the caller will wait for the command being cancelled to get returned */
2229                         return 0;
2230                 default:
2231                         return -EIO;
2232                 };
2233         }
2234 
2235         sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2236         return 0;
2237 }
2238 
2239 /**
2240  * ibmvfc_match_key - Match function for specified cancel key
2241  * @evt:        ibmvfc event struct
2242  * @key:        cancel key to match
2243  *
2244  * Returns:
2245  *      1 if event matches key / 0 if event does not match key
2246  **/
2247 static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2248 {
2249         unsigned long cancel_key = (unsigned long)key;
2250 
2251         if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2252             be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2253                 return 1;
2254         return 0;
2255 }
2256 
2257 /**
2258  * ibmvfc_match_evt - Match function for specified event
2259  * @evt:        ibmvfc event struct
2260  * @match:      event to match
2261  *
2262  * Returns:
2263  *      1 if event matches key / 0 if event does not match key
2264  **/
2265 static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2266 {
2267         if (evt == match)
2268                 return 1;
2269         return 0;
2270 }
2271 
2272 /**
2273  * ibmvfc_abort_task_set - Abort outstanding commands to the device
2274  * @sdev:       scsi device to abort commands
2275  *
2276  * This sends an Abort Task Set to the VIOS for the specified device. This does
2277  * NOT send any cancel to the VIOS. That must be done separately.
2278  *
2279  * Returns:
2280  *      0 on success / other on failure
2281  **/
2282 static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2283 {
2284         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2285         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2286         struct ibmvfc_cmd *tmf;
2287         struct ibmvfc_event *evt, *found_evt;
2288         union ibmvfc_iu rsp_iu;
2289         struct ibmvfc_fcp_rsp *fc_rsp = &rsp_iu.cmd.rsp;
2290         int rc, rsp_rc = -EBUSY;
2291         unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2292         int rsp_code = 0;
2293 
2294         spin_lock_irqsave(vhost->host->host_lock, flags);
2295         found_evt = NULL;
2296         list_for_each_entry(evt, &vhost->sent, queue) {
2297                 if (evt->cmnd && evt->cmnd->device == sdev) {
2298                         found_evt = evt;
2299                         break;
2300                 }
2301         }
2302 
2303         if (!found_evt) {
2304                 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2305                         sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2306                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2307                 return 0;
2308         }
2309 
2310         if (vhost->state == IBMVFC_ACTIVE) {
2311                 evt = ibmvfc_get_event(vhost);
2312                 ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2313 
2314                 tmf = &evt->iu.cmd;
2315                 memset(tmf, 0, sizeof(*tmf));
2316                 tmf->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offsetof(struct ibmvfc_cmd, rsp));
2317                 tmf->resp.len = cpu_to_be32(sizeof(tmf->rsp));
2318                 tmf->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
2319                 tmf->payload_len = cpu_to_be32(sizeof(tmf->iu));
2320                 tmf->resp_len = cpu_to_be32(sizeof(tmf->rsp));
2321                 tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2322                 tmf->tgt_scsi_id = cpu_to_be64(rport->port_id);
2323                 int_to_scsilun(sdev->lun, &tmf->iu.lun);
2324                 tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2325                 tmf->iu.tmf_flags = IBMVFC_ABORT_TASK_SET;
2326                 evt->sync_iu = &rsp_iu;
2327 
2328                 init_completion(&evt->comp);
2329                 rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2330         }
2331 
2332         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2333 
2334         if (rsp_rc != 0) {
2335                 sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2336                 return -EIO;
2337         }
2338 
2339         sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2340         timeout = wait_for_completion_timeout(&evt->comp, timeout);
2341 
2342         if (!timeout) {
2343                 rc = ibmvfc_cancel_all(sdev, 0);
2344                 if (!rc) {
2345                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2346                         if (rc == SUCCESS)
2347                                 rc = 0;
2348                 }
2349 
2350                 if (rc) {
2351                         sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2352                         ibmvfc_reset_host(vhost);
2353                         rsp_rc = -EIO;
2354                         rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2355 
2356                         if (rc == SUCCESS)
2357                                 rsp_rc = 0;
2358 
2359                         rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2360                         if (rc != SUCCESS) {
2361                                 spin_lock_irqsave(vhost->host->host_lock, flags);
2362                                 ibmvfc_hard_reset_host(vhost);
2363                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
2364                                 rsp_rc = 0;
2365                         }
2366 
2367                         goto out;
2368                 }
2369         }
2370 
2371         if (rsp_iu.cmd.status)
2372                 rsp_code = ibmvfc_get_err_result(&rsp_iu.cmd);
2373 
2374         if (rsp_code) {
2375                 if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2376                         rsp_code = fc_rsp->data.info.rsp_code;
2377 
2378                 sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2379                             "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2380                             ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2381                             rsp_iu.cmd.status, rsp_iu.cmd.error, fc_rsp->flags, rsp_code,
2382                             fc_rsp->scsi_status);
2383                 rsp_rc = -EIO;
2384         } else
2385                 sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2386 
2387 out:
2388         spin_lock_irqsave(vhost->host->host_lock, flags);
2389         ibmvfc_free_event(evt);
2390         spin_unlock_irqrestore(vhost->host->host_lock, flags);
2391         return rsp_rc;
2392 }
2393 
2394 /**
2395  * ibmvfc_eh_abort_handler - Abort a command
2396  * @cmd:        scsi command to abort
2397  *
2398  * Returns:
2399  *      SUCCESS / FAST_IO_FAIL / FAILED
2400  **/
2401 static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2402 {
2403         struct scsi_device *sdev = cmd->device;
2404         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2405         int cancel_rc, block_rc;
2406         int rc = FAILED;
2407 
2408         ENTER;
2409         block_rc = fc_block_scsi_eh(cmd);
2410         ibmvfc_wait_while_resetting(vhost);
2411         if (block_rc != FAST_IO_FAIL) {
2412                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2413                 ibmvfc_abort_task_set(sdev);
2414         } else
2415                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2416 
2417         if (!cancel_rc)
2418                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2419 
2420         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2421                 rc = FAST_IO_FAIL;
2422 
2423         LEAVE;
2424         return rc;
2425 }
2426 
2427 /**
2428  * ibmvfc_eh_device_reset_handler - Reset a single LUN
2429  * @cmd:        scsi command struct
2430  *
2431  * Returns:
2432  *      SUCCESS / FAST_IO_FAIL / FAILED
2433  **/
2434 static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2435 {
2436         struct scsi_device *sdev = cmd->device;
2437         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2438         int cancel_rc, block_rc, reset_rc = 0;
2439         int rc = FAILED;
2440 
2441         ENTER;
2442         block_rc = fc_block_scsi_eh(cmd);
2443         ibmvfc_wait_while_resetting(vhost);
2444         if (block_rc != FAST_IO_FAIL) {
2445                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2446                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2447         } else
2448                 cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2449 
2450         if (!cancel_rc && !reset_rc)
2451                 rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2452 
2453         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2454                 rc = FAST_IO_FAIL;
2455 
2456         LEAVE;
2457         return rc;
2458 }
2459 
2460 /**
2461  * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2462  * @sdev:       scsi device struct
2463  * @data:       return code
2464  *
2465  **/
2466 static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2467 {
2468         unsigned long *rc = data;
2469         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2470 }
2471 
2472 /**
2473  * ibmvfc_dev_cancel_all_reset - Device iterated cancel all function
2474  * @sdev:       scsi device struct
2475  * @data:       return code
2476  *
2477  **/
2478 static void ibmvfc_dev_cancel_all_reset(struct scsi_device *sdev, void *data)
2479 {
2480         unsigned long *rc = data;
2481         *rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_TGT_RESET);
2482 }
2483 
2484 /**
2485  * ibmvfc_eh_target_reset_handler - Reset the target
2486  * @cmd:        scsi command struct
2487  *
2488  * Returns:
2489  *      SUCCESS / FAST_IO_FAIL / FAILED
2490  **/
2491 static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
2492 {
2493         struct scsi_device *sdev = cmd->device;
2494         struct ibmvfc_host *vhost = shost_priv(sdev->host);
2495         struct scsi_target *starget = scsi_target(sdev);
2496         int block_rc;
2497         int reset_rc = 0;
2498         int rc = FAILED;
2499         unsigned long cancel_rc = 0;
2500 
2501         ENTER;
2502         block_rc = fc_block_scsi_eh(cmd);
2503         ibmvfc_wait_while_resetting(vhost);
2504         if (block_rc != FAST_IO_FAIL) {
2505                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_reset);
2506                 reset_rc = ibmvfc_reset_device(sdev, IBMVFC_TARGET_RESET, "target");
2507         } else
2508                 starget_for_each_device(starget, &cancel_rc, ibmvfc_dev_cancel_all_noreset);
2509 
2510         if (!cancel_rc && !reset_rc)
2511                 rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
2512 
2513         if (block_rc == FAST_IO_FAIL && rc != FAILED)
2514                 rc = FAST_IO_FAIL;
2515 
2516         LEAVE;
2517         return rc;
2518 }
2519 
2520 /**
2521  * ibmvfc_eh_host_reset_handler - Reset the connection to the server
2522  * @cmd:        struct scsi_cmnd having problems
2523  *
2524  **/
2525 static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
2526 {
2527         int rc, block_rc;
2528         struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
2529 
2530         block_rc = fc_block_scsi_eh(cmd);
2531         dev_err(vhost->dev, "Resetting connection due to error recovery\n");
2532         rc = ibmvfc_issue_fc_host_lip(vhost->host);
2533 
2534         if (block_rc == FAST_IO_FAIL)
2535                 return FAST_IO_FAIL;
2536 
2537         return rc ? FAILED : SUCCESS;
2538 }
2539 
2540 /**
2541  * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
2542  * @rport:              rport struct
2543  *
2544  * Return value:
2545  *      none
2546  **/
2547 static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
2548 {
2549         struct Scsi_Host *shost = rport_to_shost(rport);
2550         struct ibmvfc_host *vhost = shost_priv(shost);
2551         struct fc_rport *dev_rport;
2552         struct scsi_device *sdev;
2553         unsigned long rc;
2554 
2555         ENTER;
2556         shost_for_each_device(sdev, shost) {
2557                 dev_rport = starget_to_rport(scsi_target(sdev));
2558                 if (dev_rport != rport)
2559                         continue;
2560                 ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2561         }
2562 
2563         rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
2564 
2565         if (rc == FAILED)
2566                 ibmvfc_issue_fc_host_lip(shost);
2567         LEAVE;
2568 }
2569 
2570 static const struct ibmvfc_async_desc ae_desc [] = {
2571         { "PLOGI",      IBMVFC_AE_ELS_PLOGI,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2572         { "LOGO",       IBMVFC_AE_ELS_LOGO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2573         { "PRLO",       IBMVFC_AE_ELS_PRLO,     IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2574         { "N-Port SCN", IBMVFC_AE_SCN_NPORT,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2575         { "Group SCN",  IBMVFC_AE_SCN_GROUP,    IBMVFC_DEFAULT_LOG_LEVEL + 1 },
2576         { "Domain SCN", IBMVFC_AE_SCN_DOMAIN,   IBMVFC_DEFAULT_LOG_LEVEL },
2577         { "Fabric SCN", IBMVFC_AE_SCN_FABRIC,   IBMVFC_DEFAULT_LOG_LEVEL },
2578         { "Link Up",    IBMVFC_AE_LINK_UP,      IBMVFC_DEFAULT_LOG_LEVEL },
2579         { "Link Down",  IBMVFC_AE_LINK_DOWN,    IBMVFC_DEFAULT_LOG_LEVEL },
2580         { "Link Dead",  IBMVFC_AE_LINK_DEAD,    IBMVFC_DEFAULT_LOG_LEVEL },
2581         { "Halt",       IBMVFC_AE_HALT,         IBMVFC_DEFAULT_LOG_LEVEL },
2582         { "Resume",     IBMVFC_AE_RESUME,       IBMVFC_DEFAULT_LOG_LEVEL },
2583         { "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
2584 };
2585 
2586 static const struct ibmvfc_async_desc unknown_ae = {
2587         "Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
2588 };
2589 
2590 /**
2591  * ibmvfc_get_ae_desc - Get text description for async event
2592  * @ae: async event
2593  *
2594  **/
2595 static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
2596 {
2597         int i;
2598 
2599         for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
2600                 if (ae_desc[i].ae == ae)
2601                         return &ae_desc[i];
2602 
2603         return &unknown_ae;
2604 }
2605 
2606 static const struct {
2607         enum ibmvfc_ae_link_state state;
2608         const char *desc;
2609 } link_desc [] = {
2610         { IBMVFC_AE_LS_LINK_UP,         " link up" },
2611         { IBMVFC_AE_LS_LINK_BOUNCED,    " link bounced" },
2612         { IBMVFC_AE_LS_LINK_DOWN,       " link down" },
2613         { IBMVFC_AE_LS_LINK_DEAD,       " link dead" },
2614 };
2615 
2616 /**
2617  * ibmvfc_get_link_state - Get text description for link state
2618  * @state:      link state
2619  *
2620  **/
2621 static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
2622 {
2623         int i;
2624 
2625         for (i = 0; i < ARRAY_SIZE(link_desc); i++)
2626                 if (link_desc[i].state == state)
2627                         return link_desc[i].desc;
2628 
2629         return "";
2630 }
2631 
2632 /**
2633  * ibmvfc_handle_async - Handle an async event from the adapter
2634  * @crq:        crq to process
2635  * @vhost:      ibmvfc host struct
2636  *
2637  **/
2638 static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
2639                                 struct ibmvfc_host *vhost)
2640 {
2641         const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
2642         struct ibmvfc_target *tgt;
2643 
2644         ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
2645                    " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
2646                    be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
2647                    ibmvfc_get_link_state(crq->link_state));
2648 
2649         switch (be64_to_cpu(crq->event)) {
2650         case IBMVFC_AE_RESUME:
2651                 switch (crq->link_state) {
2652                 case IBMVFC_AE_LS_LINK_DOWN:
2653                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2654                         break;
2655                 case IBMVFC_AE_LS_LINK_DEAD:
2656                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2657                         break;
2658                 case IBMVFC_AE_LS_LINK_UP:
2659                 case IBMVFC_AE_LS_LINK_BOUNCED:
2660                 default:
2661                         vhost->events_to_log |= IBMVFC_AE_LINKUP;
2662                         vhost->delay_init = 1;
2663                         __ibmvfc_reset_host(vhost);
2664                         break;
2665                 };
2666 
2667                 break;
2668         case IBMVFC_AE_LINK_UP:
2669                 vhost->events_to_log |= IBMVFC_AE_LINKUP;
2670                 vhost->delay_init = 1;
2671                 __ibmvfc_reset_host(vhost);
2672                 break;
2673         case IBMVFC_AE_SCN_FABRIC:
2674         case IBMVFC_AE_SCN_DOMAIN:
2675                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2676                 if (vhost->state < IBMVFC_HALTED) {
2677                         vhost->delay_init = 1;
2678                         __ibmvfc_reset_host(vhost);
2679                 }
2680                 break;
2681         case IBMVFC_AE_SCN_NPORT:
2682         case IBMVFC_AE_SCN_GROUP:
2683                 vhost->events_to_log |= IBMVFC_AE_RSCN;
2684                 ibmvfc_reinit_host(vhost);
2685                 break;
2686         case IBMVFC_AE_ELS_LOGO:
2687         case IBMVFC_AE_ELS_PRLO:
2688         case IBMVFC_AE_ELS_PLOGI:
2689                 list_for_each_entry(tgt, &vhost->targets, queue) {
2690                         if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
2691                                 break;
2692                         if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
2693                                 continue;
2694                         if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
2695                                 continue;
2696                         if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
2697                                 continue;
2698                         if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
2699                                 tgt->logo_rcvd = 1;
2700                         if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
2701                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
2702                                 ibmvfc_reinit_host(vhost);
2703                         }
2704                 }
2705                 break;
2706         case IBMVFC_AE_LINK_DOWN:
2707         case IBMVFC_AE_ADAPTER_FAILED:
2708                 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2709                 break;
2710         case IBMVFC_AE_LINK_DEAD:
2711                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
2712                 break;
2713         case IBMVFC_AE_HALT:
2714                 ibmvfc_link_down(vhost, IBMVFC_HALTED);
2715                 break;
2716         default:
2717                 dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
2718                 break;
2719         };
2720 }
2721 
2722 /**
2723  * ibmvfc_handle_crq - Handles and frees received events in the CRQ
2724  * @crq:        Command/Response queue
2725  * @vhost:      ibmvfc host struct
2726  *
2727  **/
2728 static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
2729 {
2730         long rc;
2731         struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
2732 
2733         switch (crq->valid) {
2734         case IBMVFC_CRQ_INIT_RSP:
2735                 switch (crq->format) {
2736                 case IBMVFC_CRQ_INIT:
2737                         dev_info(vhost->dev, "Partner initialized\n");
2738                         /* Send back a response */
2739                         rc = ibmvfc_send_crq_init_complete(vhost);
2740                         if (rc == 0)
2741                                 ibmvfc_init_host(vhost);
2742                         else
2743                                 dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
2744                         break;
2745                 case IBMVFC_CRQ_INIT_COMPLETE:
2746                         dev_info(vhost->dev, "Partner initialization complete\n");
2747                         ibmvfc_init_host(vhost);
2748                         break;
2749                 default:
2750                         dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
2751                 }
2752                 return;
2753         case IBMVFC_CRQ_XPORT_EVENT:
2754                 vhost->state = IBMVFC_NO_CRQ;
2755                 vhost->logged_in = 0;
2756                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
2757                 if (crq->format == IBMVFC_PARTITION_MIGRATED) {
2758                         /* We need to re-setup the interpartition connection */
2759                         dev_info(vhost->dev, "Re-enabling adapter\n");
2760                         vhost->client_migrated = 1;
2761                         ibmvfc_purge_requests(vhost, DID_REQUEUE);
2762                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2763                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
2764                 } else {
2765                         dev_err(vhost->dev, "Virtual adapter failed (rc=%d)\n", crq->format);
2766                         ibmvfc_purge_requests(vhost, DID_ERROR);
2767                         ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
2768                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
2769                 }
2770                 return;
2771         case IBMVFC_CRQ_CMD_RSP:
2772                 break;
2773         default:
2774                 dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
2775                 return;
2776         }
2777 
2778         if (crq->format == IBMVFC_ASYNC_EVENT)
2779                 return;
2780 
2781         /* The only kind of payload CRQs we should get are responses to
2782          * things we send. Make sure this response is to something we
2783          * actually sent
2784          */
2785         if (unlikely(!ibmvfc_valid_event(&vhost->pool, evt))) {
2786                 dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
2787                         crq->ioba);
2788                 return;
2789         }
2790 
2791         if (unlikely(atomic_read(&evt->free))) {
2792                 dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
2793                         crq->ioba);
2794                 return;
2795         }
2796 
2797         del_timer(&evt->timer);
2798         list_del(&evt->queue);
2799         ibmvfc_trc_end(evt);
2800         evt->done(evt);
2801 }
2802 
2803 /**
2804  * ibmvfc_scan_finished - Check if the device scan is done.
2805  * @shost:      scsi host struct
2806  * @time:       current elapsed time
2807  *
2808  * Returns:
2809  *      0 if scan is not done / 1 if scan is done
2810  **/
2811 static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
2812 {
2813         unsigned long flags;
2814         struct ibmvfc_host *vhost = shost_priv(shost);
2815         int done = 0;
2816 
2817         spin_lock_irqsave(shost->host_lock, flags);
2818         if (time >= (init_timeout * HZ)) {
2819                 dev_info(vhost->dev, "Scan taking longer than %d seconds, "
2820                          "continuing initialization\n", init_timeout);
2821                 done = 1;
2822         }
2823 
2824         if (vhost->scan_complete)
2825                 done = 1;
2826         spin_unlock_irqrestore(shost->host_lock, flags);
2827         return done;
2828 }
2829 
2830 /**
2831  * ibmvfc_slave_alloc - Setup the device's task set value
2832  * @sdev:       struct scsi_device device to configure
2833  *
2834  * Set the device's task set value so that error handling works as
2835  * expected.
2836  *
2837  * Returns:
2838  *      0 on success / -ENXIO if device does not exist
2839  **/
2840 static int ibmvfc_slave_alloc(struct scsi_device *sdev)
2841 {
2842         struct Scsi_Host *shost = sdev->host;
2843         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2844         struct ibmvfc_host *vhost = shost_priv(shost);
2845         unsigned long flags = 0;
2846 
2847         if (!rport || fc_remote_port_chkready(rport))
2848                 return -ENXIO;
2849 
2850         spin_lock_irqsave(shost->host_lock, flags);
2851         sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
2852         spin_unlock_irqrestore(shost->host_lock, flags);
2853         return 0;
2854 }
2855 
2856 /**
2857  * ibmvfc_target_alloc - Setup the target's task set value
2858  * @starget:    struct scsi_target
2859  *
2860  * Set the target's task set value so that error handling works as
2861  * expected.
2862  *
2863  * Returns:
2864  *      0 on success / -ENXIO if device does not exist
2865  **/
2866 static int ibmvfc_target_alloc(struct scsi_target *starget)
2867 {
2868         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2869         struct ibmvfc_host *vhost = shost_priv(shost);
2870         unsigned long flags = 0;
2871 
2872         spin_lock_irqsave(shost->host_lock, flags);
2873         starget->hostdata = (void *)(unsigned long)vhost->task_set++;
2874         spin_unlock_irqrestore(shost->host_lock, flags);
2875         return 0;
2876 }
2877 
2878 /**
2879  * ibmvfc_slave_configure - Configure the device
2880  * @sdev:       struct scsi_device device to configure
2881  *
2882  * Enable allow_restart for a device if it is a disk. Adjust the
2883  * queue_depth here also.
2884  *
2885  * Returns:
2886  *      0
2887  **/
2888 static int ibmvfc_slave_configure(struct scsi_device *sdev)
2889 {
2890         struct Scsi_Host *shost = sdev->host;
2891         unsigned long flags = 0;
2892 
2893         spin_lock_irqsave(shost->host_lock, flags);
2894         if (sdev->type == TYPE_DISK)
2895                 sdev->allow_restart = 1;
2896         spin_unlock_irqrestore(shost->host_lock, flags);
2897         return 0;
2898 }
2899 
2900 /**
2901  * ibmvfc_change_queue_depth - Change the device's queue depth
2902  * @sdev:       scsi device struct
2903  * @qdepth:     depth to set
2904  * @reason:     calling context
2905  *
2906  * Return value:
2907  *      actual depth set
2908  **/
2909 static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
2910 {
2911         if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
2912                 qdepth = IBMVFC_MAX_CMDS_PER_LUN;
2913 
2914         return scsi_change_queue_depth(sdev, qdepth);
2915 }
2916 
2917 static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
2918                                                  struct device_attribute *attr, char *buf)
2919 {
2920         struct Scsi_Host *shost = class_to_shost(dev);
2921         struct ibmvfc_host *vhost = shost_priv(shost);
2922 
2923         return snprintf(buf, PAGE_SIZE, "%s\n",
2924                         vhost->login_buf->resp.partition_name);
2925 }
2926 
2927 static ssize_t ibmvfc_show_host_device_name(struct device *dev,
2928                                             struct device_attribute *attr, char *buf)
2929 {
2930         struct Scsi_Host *shost = class_to_shost(dev);
2931         struct ibmvfc_host *vhost = shost_priv(shost);
2932 
2933         return snprintf(buf, PAGE_SIZE, "%s\n",
2934                         vhost->login_buf->resp.device_name);
2935 }
2936 
2937 static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
2938                                          struct device_attribute *attr, char *buf)
2939 {
2940         struct Scsi_Host *shost = class_to_shost(dev);
2941         struct ibmvfc_host *vhost = shost_priv(shost);
2942 
2943         return snprintf(buf, PAGE_SIZE, "%s\n",
2944                         vhost->login_buf->resp.port_loc_code);
2945 }
2946 
2947 static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
2948                                          struct device_attribute *attr, char *buf)
2949 {
2950         struct Scsi_Host *shost = class_to_shost(dev);
2951         struct ibmvfc_host *vhost = shost_priv(shost);
2952 
2953         return snprintf(buf, PAGE_SIZE, "%s\n",
2954                         vhost->login_buf->resp.drc_name);
2955 }
2956 
2957 static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
2958                                              struct device_attribute *attr, char *buf)
2959 {
2960         struct Scsi_Host *shost = class_to_shost(dev);
2961         struct ibmvfc_host *vhost = shost_priv(shost);
2962         return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
2963 }
2964 
2965 static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
2966                                              struct device_attribute *attr, char *buf)
2967 {
2968         struct Scsi_Host *shost = class_to_shost(dev);
2969         struct ibmvfc_host *vhost = shost_priv(shost);
2970         return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
2971 }
2972 
2973 /**
2974  * ibmvfc_show_log_level - Show the adapter's error logging level
2975  * @dev:        class device struct
2976  * @buf:        buffer
2977  *
2978  * Return value:
2979  *      number of bytes printed to buffer
2980  **/
2981 static ssize_t ibmvfc_show_log_level(struct device *dev,
2982                                      struct device_attribute *attr, char *buf)
2983 {
2984         struct Scsi_Host *shost = class_to_shost(dev);
2985         struct ibmvfc_host *vhost = shost_priv(shost);
2986         unsigned long flags = 0;
2987         int len;
2988 
2989         spin_lock_irqsave(shost->host_lock, flags);
2990         len = snprintf(buf, PAGE_SIZE, "%d\n", vhost->log_level);
2991         spin_unlock_irqrestore(shost->host_lock, flags);
2992         return len;
2993 }
2994 
2995 /**
2996  * ibmvfc_store_log_level - Change the adapter's error logging level
2997  * @dev:        class device struct
2998  * @buf:        buffer
2999  *
3000  * Return value:
3001  *      number of bytes printed to buffer
3002  **/
3003 static ssize_t ibmvfc_store_log_level(struct device *dev,
3004                                       struct device_attribute *attr,
3005                                       const char *buf, size_t count)
3006 {
3007         struct Scsi_Host *shost = class_to_shost(dev);
3008         struct ibmvfc_host *vhost = shost_priv(shost);
3009         unsigned long flags = 0;
3010 
3011         spin_lock_irqsave(shost->host_lock, flags);
3012         vhost->log_level = simple_strtoul(buf, NULL, 10);
3013         spin_unlock_irqrestore(shost->host_lock, flags);
3014         return strlen(buf);
3015 }
3016 
3017 static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3018 static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3019 static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3020 static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3021 static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3022 static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3023 static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3024                    ibmvfc_show_log_level, ibmvfc_store_log_level);
3025 
3026 #ifdef CONFIG_SCSI_IBMVFC_TRACE
3027 /**
3028  * ibmvfc_read_trace - Dump the adapter trace
3029  * @filp:               open sysfs file
3030  * @kobj:               kobject struct
3031  * @bin_attr:   bin_attribute struct
3032  * @buf:                buffer
3033  * @off:                offset
3034  * @count:              buffer size
3035  *
3036  * Return value:
3037  *      number of bytes printed to buffer
3038  **/
3039 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3040                                  struct bin_attribute *bin_attr,
3041                                  char *buf, loff_t off, size_t count)
3042 {
3043         struct device *dev = container_of(kobj, struct device, kobj);
3044         struct Scsi_Host *shost = class_to_shost(dev);
3045         struct ibmvfc_host *vhost = shost_priv(shost);
3046         unsigned long flags = 0;
3047         int size = IBMVFC_TRACE_SIZE;
3048         char *src = (char *)vhost->trace;
3049 
3050         if (off > size)
3051                 return 0;
3052         if (off + count > size) {
3053                 size -= off;
3054                 count = size;
3055         }
3056 
3057         spin_lock_irqsave(shost->host_lock, flags);
3058         memcpy(buf, &src[off], count);
3059         spin_unlock_irqrestore(shost->host_lock, flags);
3060         return count;
3061 }
3062 
3063 static struct bin_attribute ibmvfc_trace_attr = {
3064         .attr = {
3065                 .name = "trace",
3066                 .mode = S_IRUGO,
3067         },
3068         .size = 0,
3069         .read = ibmvfc_read_trace,
3070 };
3071 #endif
3072 
3073 static struct device_attribute *ibmvfc_attrs[] = {
3074         &dev_attr_partition_name,
3075         &dev_attr_device_name,
3076         &dev_attr_port_loc_code,
3077         &dev_attr_drc_name,
3078         &dev_attr_npiv_version,
3079         &dev_attr_capabilities,
3080         &dev_attr_log_level,
3081         NULL
3082 };
3083 
3084 static struct scsi_host_template driver_template = {
3085         .module = THIS_MODULE,
3086         .name = "IBM POWER Virtual FC Adapter",
3087         .proc_name = IBMVFC_NAME,
3088         .queuecommand = ibmvfc_queuecommand,
3089         .eh_abort_handler = ibmvfc_eh_abort_handler,
3090         .eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3091         .eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3092         .eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3093         .slave_alloc = ibmvfc_slave_alloc,
3094         .slave_configure = ibmvfc_slave_configure,
3095         .target_alloc = ibmvfc_target_alloc,
3096         .scan_finished = ibmvfc_scan_finished,
3097         .change_queue_depth = ibmvfc_change_queue_depth,
3098         .cmd_per_lun = 16,
3099         .can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3100         .this_id = -1,
3101         .sg_tablesize = SG_ALL,
3102         .max_sectors = IBMVFC_MAX_SECTORS,
3103         .use_clustering = ENABLE_CLUSTERING,
3104         .shost_attrs = ibmvfc_attrs,
3105         .track_queue_depth = 1,
3106 };
3107 
3108 /**
3109  * ibmvfc_next_async_crq - Returns the next entry in async queue
3110  * @vhost:      ibmvfc host struct
3111  *
3112  * Returns:
3113  *      Pointer to next entry in queue / NULL if empty
3114  **/
3115 static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3116 {
3117         struct ibmvfc_async_crq_queue *async_crq = &vhost->async_crq;
3118         struct ibmvfc_async_crq *crq;
3119 
3120         crq = &async_crq->msgs[async_crq->cur];
3121         if (crq->valid & 0x80) {
3122                 if (++async_crq->cur == async_crq->size)
3123                         async_crq->cur = 0;
3124                 rmb();
3125         } else
3126                 crq = NULL;
3127 
3128         return crq;
3129 }
3130 
3131 /**
3132  * ibmvfc_next_crq - Returns the next entry in message queue
3133  * @vhost:      ibmvfc host struct
3134  *
3135  * Returns:
3136  *      Pointer to next entry in queue / NULL if empty
3137  **/
3138 static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3139 {
3140         struct ibmvfc_crq_queue *queue = &vhost->crq;
3141         struct ibmvfc_crq *crq;
3142 
3143         crq = &queue->msgs[queue->cur];
3144         if (crq->valid & 0x80) {
3145                 if (++queue->cur == queue->size)
3146                         queue->cur = 0;
3147                 rmb();
3148         } else
3149                 crq = NULL;
3150 
3151         return crq;
3152 }
3153 
3154 /**
3155  * ibmvfc_interrupt - Interrupt handler
3156  * @irq:                number of irq to handle, not used
3157  * @dev_instance: ibmvfc_host that received interrupt
3158  *
3159  * Returns:
3160  *      IRQ_HANDLED
3161  **/
3162 static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3163 {
3164         struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3165         unsigned long flags;
3166 
3167         spin_lock_irqsave(vhost->host->host_lock, flags);
3168         vio_disable_interrupts(to_vio_dev(vhost->dev));
3169         tasklet_schedule(&vhost->tasklet);
3170         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3171         return IRQ_HANDLED;
3172 }
3173 
3174 /**
3175  * ibmvfc_tasklet - Interrupt handler tasklet
3176  * @data:               ibmvfc host struct
3177  *
3178  * Returns:
3179  *      Nothing
3180  **/
3181 static void ibmvfc_tasklet(void *data)
3182 {
3183         struct ibmvfc_host *vhost = data;
3184         struct vio_dev *vdev = to_vio_dev(vhost->dev);
3185         struct ibmvfc_crq *crq;
3186         struct ibmvfc_async_crq *async;
3187         unsigned long flags;
3188         int done = 0;
3189 
3190         spin_lock_irqsave(vhost->host->host_lock, flags);
3191         while (!done) {
3192                 /* Pull all the valid messages off the async CRQ */
3193                 while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3194                         ibmvfc_handle_async(async, vhost);
3195                         async->valid = 0;
3196                         wmb();
3197                 }
3198 
3199                 /* Pull all the valid messages off the CRQ */
3200                 while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3201                         ibmvfc_handle_crq(crq, vhost);
3202                         crq->valid = 0;
3203                         wmb();
3204                 }
3205 
3206                 vio_enable_interrupts(vdev);
3207                 if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3208                         vio_disable_interrupts(vdev);
3209                         ibmvfc_handle_async(async, vhost);
3210                         async->valid = 0;
3211                         wmb();
3212                 } else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3213                         vio_disable_interrupts(vdev);
3214                         ibmvfc_handle_crq(crq, vhost);
3215                         crq->valid = 0;
3216                         wmb();
3217                 } else
3218                         done = 1;
3219         }
3220 
3221         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3222 }
3223 
3224 /**
3225  * ibmvfc_init_tgt - Set the next init job step for the target
3226  * @tgt:                ibmvfc target struct
3227  * @job_step:   job step to perform
3228  *
3229  **/
3230 static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3231                             void (*job_step) (struct ibmvfc_target *))
3232 {
3233         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT);
3234         tgt->job_step = job_step;
3235         wake_up(&tgt->vhost->work_wait_q);
3236 }
3237 
3238 /**
3239  * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3240  * @tgt:                ibmvfc target struct
3241  * @job_step:   initialization job step
3242  *
3243  * Returns: 1 if step will be retried / 0 if not
3244  *
3245  **/
3246 static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3247                                   void (*job_step) (struct ibmvfc_target *))
3248 {
3249         if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3250                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3251                 wake_up(&tgt->vhost->work_wait_q);
3252                 return 0;
3253         } else
3254                 ibmvfc_init_tgt(tgt, job_step);
3255         return 1;
3256 }
3257 
3258 /* Defined in FC-LS */
3259 static const struct {
3260         int code;
3261         int retry;
3262         int logged_in;
3263 } prli_rsp [] = {
3264         { 0, 1, 0 },
3265         { 1, 0, 1 },
3266         { 2, 1, 0 },
3267         { 3, 1, 0 },
3268         { 4, 0, 0 },
3269         { 5, 0, 0 },
3270         { 6, 0, 1 },
3271         { 7, 0, 0 },
3272         { 8, 1, 0 },
3273 };
3274 
3275 /**
3276  * ibmvfc_get_prli_rsp - Find PRLI response index
3277  * @flags:      PRLI response flags
3278  *
3279  **/
3280 static int ibmvfc_get_prli_rsp(u16 flags)
3281 {
3282         int i;
3283         int code = (flags & 0x0f00) >> 8;
3284 
3285         for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
3286                 if (prli_rsp[i].code == code)
3287                         return i;
3288 
3289         return 0;
3290 }
3291 
3292 /**
3293  * ibmvfc_tgt_prli_done - Completion handler for Process Login
3294  * @evt:        ibmvfc event struct
3295  *
3296  **/
3297 static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
3298 {
3299         struct ibmvfc_target *tgt = evt->tgt;
3300         struct ibmvfc_host *vhost = evt->vhost;
3301         struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
3302         struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
3303         u32 status = be16_to_cpu(rsp->common.status);
3304         int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
3305 
3306         vhost->discovery_threads--;
3307         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3308         switch (status) {
3309         case IBMVFC_MAD_SUCCESS:
3310                 tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
3311                         parms->type, parms->flags, parms->service_parms);
3312 
3313                 if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
3314                         index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
3315                         if (prli_rsp[index].logged_in) {
3316                                 if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
3317                                         tgt->need_login = 0;
3318                                         tgt->ids.roles = 0;
3319                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
3320                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
3321                                         if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
3322                                                 tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
3323                                         tgt->add_rport = 1;
3324                                 } else
3325                                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3326                         } else if (prli_rsp[index].retry)
3327                                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3328                         else
3329                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3330                 } else
3331                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3332                 break;
3333         case IBMVFC_MAD_DRIVER_FAILED:
3334                 break;
3335         case IBMVFC_MAD_CRQ_ERROR:
3336                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3337                 break;
3338         case IBMVFC_MAD_FAILED:
3339         default:
3340                 if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
3341                      be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
3342                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3343                 else if (tgt->logo_rcvd)
3344                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3345                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3346                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
3347                 else
3348                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3349 
3350                 tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
3351                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3352                         rsp->status, rsp->error, status);
3353                 break;
3354         };
3355 
3356         kref_put(&tgt->kref, ibmvfc_release_tgt);
3357         ibmvfc_free_event(evt);
3358         wake_up(&vhost->work_wait_q);
3359 }
3360 
3361 /**
3362  * ibmvfc_tgt_send_prli - Send a process login
3363  * @tgt:        ibmvfc target struct
3364  *
3365  **/
3366 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
3367 {
3368         struct ibmvfc_process_login *prli;
3369         struct ibmvfc_host *vhost = tgt->vhost;
3370         struct ibmvfc_event *evt;
3371 
3372         if (vhost->discovery_threads >= disc_threads)
3373                 return;
3374 
3375         kref_get(&tgt->kref);
3376         evt = ibmvfc_get_event(vhost);
3377         vhost->discovery_threads++;
3378         ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
3379         evt->tgt = tgt;
3380         prli = &evt->iu.prli;
3381         memset(prli, 0, sizeof(*prli));
3382         prli->common.version = cpu_to_be32(1);
3383         prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
3384         prli->common.length = cpu_to_be16(sizeof(*prli));
3385         prli->scsi_id = cpu_to_be64(tgt->scsi_id);
3386 
3387         prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
3388         prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
3389         prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
3390         prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
3391 
3392         if (cls3_error)
3393                 prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
3394 
3395         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3396         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3397                 vhost->discovery_threads--;
3398                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3399                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3400         } else
3401                 tgt_dbg(tgt, "Sent process login\n");
3402 }
3403 
3404 /**
3405  * ibmvfc_tgt_plogi_done - Completion handler for Port Login
3406  * @evt:        ibmvfc event struct
3407  *
3408  **/
3409 static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
3410 {
3411         struct ibmvfc_target *tgt = evt->tgt;
3412         struct ibmvfc_host *vhost = evt->vhost;
3413         struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
3414         u32 status = be16_to_cpu(rsp->common.status);
3415         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3416 
3417         vhost->discovery_threads--;
3418         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3419         switch (status) {
3420         case IBMVFC_MAD_SUCCESS:
3421                 tgt_dbg(tgt, "Port Login succeeded\n");
3422                 if (tgt->ids.port_name &&
3423                     tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
3424                         vhost->reinit = 1;
3425                         tgt_dbg(tgt, "Port re-init required\n");
3426                         break;
3427                 }
3428                 tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
3429                 tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
3430                 tgt->ids.port_id = tgt->scsi_id;
3431                 memcpy(&tgt->service_parms, &rsp->service_parms,
3432                        sizeof(tgt->service_parms));
3433                 memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
3434                        sizeof(tgt->service_parms_change));
3435                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
3436                 break;
3437         case IBMVFC_MAD_DRIVER_FAILED:
3438                 break;
3439         case IBMVFC_MAD_CRQ_ERROR:
3440                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3441                 break;
3442         case IBMVFC_MAD_FAILED:
3443         default:
3444                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3445                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
3446                 else
3447                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3448 
3449                 tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3450                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)), rsp->status, rsp->error,
3451                         ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), rsp->fc_type,
3452                         ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), rsp->fc_explain, status);
3453                 break;
3454         };
3455 
3456         kref_put(&tgt->kref, ibmvfc_release_tgt);
3457         ibmvfc_free_event(evt);
3458         wake_up(&vhost->work_wait_q);
3459 }
3460 
3461 /**
3462  * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
3463  * @tgt:        ibmvfc target struct
3464  *
3465  **/
3466 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
3467 {
3468         struct ibmvfc_port_login *plogi;
3469         struct ibmvfc_host *vhost = tgt->vhost;
3470         struct ibmvfc_event *evt;
3471 
3472         if (vhost->discovery_threads >= disc_threads)
3473                 return;
3474 
3475         kref_get(&tgt->kref);
3476         tgt->logo_rcvd = 0;
3477         evt = ibmvfc_get_event(vhost);
3478         vhost->discovery_threads++;
3479         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3480         ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
3481         evt->tgt = tgt;
3482         plogi = &evt->iu.plogi;
3483         memset(plogi, 0, sizeof(*plogi));
3484         plogi->common.version = cpu_to_be32(1);
3485         plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
3486         plogi->common.length = cpu_to_be16(sizeof(*plogi));
3487         plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
3488 
3489         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3490                 vhost->discovery_threads--;
3491                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3492                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3493         } else
3494                 tgt_dbg(tgt, "Sent port login\n");
3495 }
3496 
3497 /**
3498  * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
3499  * @evt:        ibmvfc event struct
3500  *
3501  **/
3502 static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
3503 {
3504         struct ibmvfc_target *tgt = evt->tgt;
3505         struct ibmvfc_host *vhost = evt->vhost;
3506         struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
3507         u32 status = be16_to_cpu(rsp->common.status);
3508 
3509         vhost->discovery_threads--;
3510         ibmvfc_free_event(evt);
3511         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3512 
3513         switch (status) {
3514         case IBMVFC_MAD_SUCCESS:
3515                 tgt_dbg(tgt, "Implicit Logout succeeded\n");
3516                 break;
3517         case IBMVFC_MAD_DRIVER_FAILED:
3518                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3519                 wake_up(&vhost->work_wait_q);
3520                 return;
3521         case IBMVFC_MAD_FAILED:
3522         default:
3523                 tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
3524                 break;
3525         };
3526 
3527         if (vhost->action == IBMVFC_HOST_ACTION_TGT_INIT)
3528                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
3529         else if (vhost->action == IBMVFC_HOST_ACTION_QUERY_TGTS &&
3530                  tgt->scsi_id != tgt->new_scsi_id)
3531                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3532         kref_put(&tgt->kref, ibmvfc_release_tgt);
3533         wake_up(&vhost->work_wait_q);
3534 }
3535 
3536 /**
3537  * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
3538  * @tgt:                ibmvfc target struct
3539  *
3540  **/
3541 static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
3542 {
3543         struct ibmvfc_implicit_logout *mad;
3544         struct ibmvfc_host *vhost = tgt->vhost;
3545         struct ibmvfc_event *evt;
3546 
3547         if (vhost->discovery_threads >= disc_threads)
3548                 return;
3549 
3550         kref_get(&tgt->kref);
3551         evt = ibmvfc_get_event(vhost);
3552         vhost->discovery_threads++;
3553         ibmvfc_init_event(evt, ibmvfc_tgt_implicit_logout_done, IBMVFC_MAD_FORMAT);
3554         evt->tgt = tgt;
3555         mad = &evt->iu.implicit_logout;
3556         memset(mad, 0, sizeof(*mad));
3557         mad->common.version = cpu_to_be32(1);
3558         mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
3559         mad->common.length = cpu_to_be16(sizeof(*mad));
3560         mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
3561 
3562         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3563         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3564                 vhost->discovery_threads--;
3565                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3566                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3567         } else
3568                 tgt_dbg(tgt, "Sent Implicit Logout\n");
3569 }
3570 
3571 /**
3572  * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
3573  * @mad:        ibmvfc passthru mad struct
3574  * @tgt:        ibmvfc target struct
3575  *
3576  * Returns:
3577  *      1 if PLOGI needed / 0 if PLOGI not needed
3578  **/
3579 static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
3580                                     struct ibmvfc_target *tgt)
3581 {
3582         if (memcmp(&mad->fc_iu.response[2], &tgt->ids.port_name,
3583                    sizeof(tgt->ids.port_name)))
3584                 return 1;
3585         if (memcmp(&mad->fc_iu.response[4], &tgt->ids.node_name,
3586                    sizeof(tgt->ids.node_name)))
3587                 return 1;
3588         if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
3589                 return 1;
3590         return 0;
3591 }
3592 
3593 /**
3594  * ibmvfc_tgt_adisc_done - Completion handler for ADISC
3595  * @evt:        ibmvfc event struct
3596  *
3597  **/
3598 static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
3599 {
3600         struct ibmvfc_target *tgt = evt->tgt;
3601         struct ibmvfc_host *vhost = evt->vhost;
3602         struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
3603         u32 status = be16_to_cpu(mad->common.status);
3604         u8 fc_reason, fc_explain;
3605 
3606         vhost->discovery_threads--;
3607         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3608         del_timer(&tgt->timer);
3609 
3610         switch (status) {
3611         case IBMVFC_MAD_SUCCESS:
3612                 tgt_dbg(tgt, "ADISC succeeded\n");
3613                 if (ibmvfc_adisc_needs_plogi(mad, tgt))
3614                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3615                 break;
3616         case IBMVFC_MAD_DRIVER_FAILED:
3617                 break;
3618         case IBMVFC_MAD_FAILED:
3619         default:
3620                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3621                 fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
3622                 fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
3623                 tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3624                          ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
3625                          mad->iu.status, mad->iu.error,
3626                          ibmvfc_get_fc_type(fc_reason), fc_reason,
3627                          ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
3628                 break;
3629         };
3630 
3631         kref_put(&tgt->kref, ibmvfc_release_tgt);
3632         ibmvfc_free_event(evt);
3633         wake_up(&vhost->work_wait_q);
3634 }
3635 
3636 /**
3637  * ibmvfc_init_passthru - Initialize an event struct for FC passthru
3638  * @evt:                ibmvfc event struct
3639  *
3640  **/
3641 static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
3642 {
3643         struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
3644 
3645         memset(mad, 0, sizeof(*mad));
3646         mad->common.version = cpu_to_be32(1);
3647         mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
3648         mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
3649         mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3650                 offsetof(struct ibmvfc_passthru_mad, iu));
3651         mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
3652         mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3653         mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
3654         mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3655                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3656                 offsetof(struct ibmvfc_passthru_fc_iu, payload));
3657         mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
3658         mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
3659                 offsetof(struct ibmvfc_passthru_mad, fc_iu) +
3660                 offsetof(struct ibmvfc_passthru_fc_iu, response));
3661         mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
3662 }
3663 
3664 /**
3665  * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
3666  * @evt:                ibmvfc event struct
3667  *
3668  * Just cleanup this event struct. Everything else is handled by
3669  * the ADISC completion handler. If the ADISC never actually comes
3670  * back, we still have the timer running on the ADISC event struct
3671  * which will fire and cause the CRQ to get reset.
3672  *
3673  **/
3674 static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
3675 {
3676         struct ibmvfc_host *vhost = evt->vhost;
3677         struct ibmvfc_target *tgt = evt->tgt;
3678 
3679         tgt_dbg(tgt, "ADISC cancel complete\n");
3680         vhost->abort_threads--;
3681         ibmvfc_free_event(evt);
3682         kref_put(&tgt->kref, ibmvfc_release_tgt);
3683         wake_up(&vhost->work_wait_q);
3684 }
3685 
3686 /**
3687  * ibmvfc_adisc_timeout - Handle an ADISC timeout
3688  * @tgt:                ibmvfc target struct
3689  *
3690  * If an ADISC times out, send a cancel. If the cancel times
3691  * out, reset the CRQ. When the ADISC comes back as cancelled,
3692  * log back into the target.
3693  **/
3694 static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
3695 {
3696         struct ibmvfc_host *vhost = tgt->vhost;
3697         struct ibmvfc_event *evt;
3698         struct ibmvfc_tmf *tmf;
3699         unsigned long flags;
3700         int rc;
3701 
3702         tgt_dbg(tgt, "ADISC timeout\n");
3703         spin_lock_irqsave(vhost->host->host_lock, flags);
3704         if (vhost->abort_threads >= disc_threads ||
3705             tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
3706             vhost->state != IBMVFC_INITIALIZING ||
3707             vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
3708                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
3709                 return;
3710         }
3711 
3712         vhost->abort_threads++;
3713         kref_get(&tgt->kref);
3714         evt = ibmvfc_get_event(vhost);
3715         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
3716 
3717         evt->tgt = tgt;
3718         tmf = &evt->iu.tmf;
3719         memset(tmf, 0, sizeof(*tmf));
3720         tmf->common.version = cpu_to_be32(1);
3721         tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
3722         tmf->common.length = cpu_to_be16(sizeof(*tmf));
3723         tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
3724         tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
3725 
3726         rc = ibmvfc_send_event(evt, vhost, default_timeout);
3727 
3728         if (rc) {
3729                 tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
3730                 vhost->abort_threads--;
3731                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3732                 __ibmvfc_reset_host(vhost);
3733         } else
3734                 tgt_dbg(tgt, "Attempting to cancel ADISC\n");
3735         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3736 }
3737 
3738 /**
3739  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
3740  * @tgt:                ibmvfc target struct
3741  *
3742  * When sending an ADISC we end up with two timers running. The
3743  * first timer is the timer in the ibmvfc target struct. If this
3744  * fires, we send a cancel to the target. The second timer is the
3745  * timer on the ibmvfc event for the ADISC, which is longer. If that
3746  * fires, it means the ADISC timed out and our attempt to cancel it
3747  * also failed, so we need to reset the CRQ.
3748  **/
3749 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
3750 {
3751         struct ibmvfc_passthru_mad *mad;
3752         struct ibmvfc_host *vhost = tgt->vhost;
3753         struct ibmvfc_event *evt;
3754 
3755         if (vhost->discovery_threads >= disc_threads)
3756                 return;
3757 
3758         kref_get(&tgt->kref);
3759         evt = ibmvfc_get_event(vhost);
3760         vhost->discovery_threads++;
3761         ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
3762         evt->tgt = tgt;
3763 
3764         ibmvfc_init_passthru(evt);
3765         mad = &evt->iu.passthru;
3766         mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
3767         mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
3768         mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
3769 
3770         mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
3771         memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
3772                sizeof(vhost->login_buf->resp.port_name));
3773         memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
3774                sizeof(vhost->login_buf->resp.node_name));
3775         mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
3776 
3777         if (timer_pending(&tgt->timer))
3778                 mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
3779         else {
3780                 tgt->timer.data = (unsigned long) tgt;
3781                 tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
3782                 tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
3783                 add_timer(&tgt->timer);
3784         }
3785 
3786         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3787         if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
3788                 vhost->discovery_threads--;
3789                 del_timer(&tgt->timer);
3790                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3791                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3792         } else
3793                 tgt_dbg(tgt, "Sent ADISC\n");
3794 }
3795 
3796 /**
3797  * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
3798  * @evt:        ibmvfc event struct
3799  *
3800  **/
3801 static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
3802 {
3803         struct ibmvfc_target *tgt = evt->tgt;
3804         struct ibmvfc_host *vhost = evt->vhost;
3805         struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
3806         u32 status = be16_to_cpu(rsp->common.status);
3807         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3808 
3809         vhost->discovery_threads--;
3810         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3811         switch (status) {
3812         case IBMVFC_MAD_SUCCESS:
3813                 tgt_dbg(tgt, "Query Target succeeded\n");
3814                 tgt->new_scsi_id = be64_to_cpu(rsp->scsi_id);
3815                 if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
3816                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3817                 else
3818                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
3819                 break;
3820         case IBMVFC_MAD_DRIVER_FAILED:
3821                 break;
3822         case IBMVFC_MAD_CRQ_ERROR:
3823                 ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3824                 break;
3825         case IBMVFC_MAD_FAILED:
3826         default:
3827                 if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
3828                     be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
3829                     be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
3830                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3831                 else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
3832                         level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
3833                 else
3834                         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
3835 
3836                 tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
3837                         ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3838                         rsp->status, rsp->error, ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)),
3839                         rsp->fc_type, ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)),
3840                         rsp->fc_explain, status);
3841                 break;
3842         };
3843 
3844         kref_put(&tgt->kref, ibmvfc_release_tgt);
3845         ibmvfc_free_event(evt);
3846         wake_up(&vhost->work_wait_q);
3847 }
3848 
3849 /**
3850  * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
3851  * @tgt:        ibmvfc target struct
3852  *
3853  **/
3854 static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
3855 {
3856         struct ibmvfc_query_tgt *query_tgt;
3857         struct ibmvfc_host *vhost = tgt->vhost;
3858         struct ibmvfc_event *evt;
3859 
3860         if (vhost->discovery_threads >= disc_threads)
3861                 return;
3862 
3863         kref_get(&tgt->kref);
3864         evt = ibmvfc_get_event(vhost);
3865         vhost->discovery_threads++;
3866         evt->tgt = tgt;
3867         ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
3868         query_tgt = &evt->iu.query_tgt;
3869         memset(query_tgt, 0, sizeof(*query_tgt));
3870         query_tgt->common.version = cpu_to_be32(1);
3871         query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
3872         query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
3873         query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
3874 
3875         ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
3876         if (ibmvfc_send_event(evt, vhost, default_timeout)) {
3877                 vhost->discovery_threads--;
3878                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
3879                 kref_put(&tgt->kref, ibmvfc_release_tgt);
3880         } else
3881                 tgt_dbg(tgt, "Sent Query Target\n");
3882 }
3883 
3884 /**
3885  * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
3886  * @vhost:              ibmvfc host struct
3887  * @scsi_id:    SCSI ID to allocate target for
3888  *
3889  * Returns:
3890  *      0 on success / other on failure
3891  **/
3892 static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
3893 {
3894         struct ibmvfc_target *tgt;
3895         unsigned long flags;
3896 
3897         spin_lock_irqsave(vhost->host->host_lock, flags);
3898         list_for_each_entry(tgt, &vhost->targets, queue) {
3899                 if (tgt->scsi_id == scsi_id) {
3900                         if (tgt->need_login)
3901                                 ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3902                         goto unlock_out;
3903                 }
3904         }
3905         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3906 
3907         tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
3908         if (!tgt) {
3909                 dev_err(vhost->dev, "Target allocation failure for scsi id %08llx\n",
3910                         scsi_id);
3911                 return -ENOMEM;
3912         }
3913 
3914         memset(tgt, 0, sizeof(*tgt));
3915         tgt->scsi_id = scsi_id;
3916         tgt->new_scsi_id = scsi_id;
3917         tgt->vhost = vhost;
3918         tgt->need_login = 1;
3919         tgt->cancel_key = vhost->task_set++;
3920         init_timer(&tgt->timer);
3921         kref_init(&tgt->kref);
3922         ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
3923         spin_lock_irqsave(vhost->host->host_lock, flags);
3924         list_add_tail(&tgt->queue, &vhost->targets);
3925 
3926 unlock_out:
3927         spin_unlock_irqrestore(vhost->host->host_lock, flags);
3928         return 0;
3929 }
3930 
3931 /**
3932  * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
3933  * @vhost:              ibmvfc host struct
3934  *
3935  * Returns:
3936  *      0 on success / other on failure
3937  **/
3938 static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
3939 {
3940         int i, rc;
3941 
3942         for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
3943                 rc = ibmvfc_alloc_target(vhost,
3944                                          be32_to_cpu(vhost->disc_buf->scsi_id[i]) &
3945                                          IBMVFC_DISC_TGT_SCSI_ID_MASK);
3946 
3947         return rc;
3948 }
3949 
3950 /**
3951  * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
3952  * @evt:        ibmvfc event struct
3953  *
3954  **/
3955 static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
3956 {
3957         struct ibmvfc_host *vhost = evt->vhost;
3958         struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
3959         u32 mad_status = be16_to_cpu(rsp->common.status);
3960         int level = IBMVFC_DEFAULT_LOG_LEVEL;
3961 
3962         switch (mad_status) {
3963         case IBMVFC_MAD_SUCCESS:
3964                 ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
3965                 vhost->num_targets = be32_to_cpu(rsp->num_written);
3966                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
3967                 break;
3968         case IBMVFC_MAD_FAILED:
3969                 level += ibmvfc_retry_host_init(vhost);
3970                 ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
3971                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
3972                            rsp->status, rsp->error);
3973                 break;
3974         case IBMVFC_MAD_DRIVER_FAILED:
3975                 break;
3976         default:
3977                 dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
3978                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3979                 break;
3980         }
3981 
3982         ibmvfc_free_event(evt);
3983         wake_up(&vhost->work_wait_q);
3984 }
3985 
3986 /**
3987  * ibmvfc_discover_targets - Send Discover Targets MAD
3988  * @vhost:      ibmvfc host struct
3989  *
3990  **/
3991 static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
3992 {
3993         struct ibmvfc_discover_targets *mad;
3994         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
3995 
3996         ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
3997         mad = &evt->iu.discover_targets;
3998         memset(mad, 0, sizeof(*mad));
3999         mad->common.version = cpu_to_be32(1);
4000         mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
4001         mad->common.length = cpu_to_be16(sizeof(*mad));
4002         mad->bufflen = cpu_to_be32(vhost->disc_buf_sz);
4003         mad->buffer.va = cpu_to_be64(vhost->disc_buf_dma);
4004         mad->buffer.len = cpu_to_be32(vhost->disc_buf_sz);
4005         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4006 
4007         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4008                 ibmvfc_dbg(vhost, "Sent discover targets\n");
4009         else
4010                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4011 }
4012 
4013 /**
4014  * ibmvfc_npiv_login_done - Completion handler for NPIV Login
4015  * @evt:        ibmvfc event struct
4016  *
4017  **/
4018 static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
4019 {
4020         struct ibmvfc_host *vhost = evt->vhost;
4021         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
4022         struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
4023         unsigned int npiv_max_sectors;
4024         int level = IBMVFC_DEFAULT_LOG_LEVEL;
4025 
4026         switch (mad_status) {
4027         case IBMVFC_MAD_SUCCESS:
4028                 ibmvfc_free_event(evt);
4029                 break;
4030         case IBMVFC_MAD_FAILED:
4031                 if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4032                         level += ibmvfc_retry_host_init(vhost);
4033                 else
4034                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4035                 ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
4036                            ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4037                                                 rsp->status, rsp->error);
4038                 ibmvfc_free_event(evt);
4039                 return;
4040         case IBMVFC_MAD_CRQ_ERROR:
4041                 ibmvfc_retry_host_init(vhost);
4042         case IBMVFC_MAD_DRIVER_FAILED:
4043                 ibmvfc_free_event(evt);
4044                 return;
4045         default:
4046                 dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
4047                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4048                 ibmvfc_free_event(evt);
4049                 return;
4050         }
4051 
4052         vhost->client_migrated = 0;
4053 
4054         if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
4055                 dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
4056                         rsp->flags);
4057                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4058                 wake_up(&vhost->work_wait_q);
4059                 return;
4060         }
4061 
4062         if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
4063                 dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
4064                         rsp->max_cmds);
4065                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4066                 wake_up(&vhost->work_wait_q);
4067                 return;
4068         }
4069 
4070         vhost->logged_in = 1;
4071         npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
4072         dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
4073                  rsp->partition_name, rsp->device_name, rsp->port_loc_code,
4074                  rsp->drc_name, npiv_max_sectors);
4075 
4076         fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
4077         fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
4078         fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
4079         fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
4080         fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
4081         fc_host_supported_classes(vhost->host) = 0;
4082         if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
4083                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
4084         if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
4085                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
4086         if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
4087                 fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
4088         fc_host_maxframe_size(vhost->host) =
4089                 be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
4090 
4091         vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
4092         vhost->host->max_sectors = npiv_max_sectors;
4093         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4094         wake_up(&vhost->work_wait_q);
4095 }
4096 
4097 /**
4098  * ibmvfc_npiv_login - Sends NPIV login
4099  * @vhost:      ibmvfc host struct
4100  *
4101  **/
4102 static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
4103 {
4104         struct ibmvfc_npiv_login_mad *mad;
4105         struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
4106 
4107         ibmvfc_gather_partition_info(vhost);
4108         ibmvfc_set_login_info(vhost);
4109         ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
4110 
4111         memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
4112         mad = &evt->iu.npiv_login;
4113         memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
4114         mad->common.version = cpu_to_be32(1);
4115         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
4116         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
4117         mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
4118         mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
4119 
4120         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
4121 
4122         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4123                 ibmvfc_dbg(vhost, "Sent NPIV login\n");
4124         else
4125                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4126 };
4127 
4128 /**
4129  * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
4130  * @vhost:              ibmvfc host struct
4131  *
4132  **/
4133 static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
4134 {
4135         struct ibmvfc_host *vhost = evt->vhost;
4136         u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
4137 
4138         ibmvfc_free_event(evt);
4139 
4140         switch (mad_status) {
4141         case IBMVFC_MAD_SUCCESS:
4142                 if (list_empty(&vhost->sent) &&
4143                     vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
4144                         ibmvfc_init_host(vhost);
4145                         return;
4146                 }
4147                 break;
4148         case IBMVFC_MAD_FAILED:
4149         case IBMVFC_MAD_NOT_SUPPORTED:
4150         case IBMVFC_MAD_CRQ_ERROR:
4151         case IBMVFC_MAD_DRIVER_FAILED:
4152         default:
4153                 ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
4154                 break;
4155         }
4156 
4157         ibmvfc_hard_reset_host(vhost);
4158 }
4159 
4160 /**
4161  * ibmvfc_npiv_logout - Issue an NPIV Logout
4162  * @vhost:              ibmvfc host struct
4163  *
4164  **/
4165 static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
4166 {
4167         struct ibmvfc_npiv_logout_mad *mad;
4168         struct ibmvfc_event *evt;
4169 
4170         evt = ibmvfc_get_event(vhost);
4171         ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
4172 
4173         mad = &evt->iu.npiv_logout;
4174         memset(mad, 0, sizeof(*mad));
4175         mad->common.version = cpu_to_be32(1);
4176         mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
4177         mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
4178 
4179         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
4180 
4181         if (!ibmvfc_send_event(evt, vhost, default_timeout))
4182                 ibmvfc_dbg(vhost, "Sent NPIV logout\n");
4183         else
4184                 ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4185 }
4186 
4187 /**
4188  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
4189  * @vhost:              ibmvfc host struct
4190  *
4191  * Returns:
4192  *      1 if work to do / 0 if not
4193  **/
4194 static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
4195 {
4196         struct ibmvfc_target *tgt;
4197 
4198         list_for_each_entry(tgt, &vhost->targets, queue) {
4199                 if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
4200                     tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4201                         return 1;
4202         }
4203 
4204         return 0;
4205 }
4206 
4207 /**
4208  * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
4209  * @vhost:              ibmvfc host struct
4210  *
4211  * Returns:
4212  *      1 if work to do / 0 if not
4213  **/
4214 static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4215 {
4216         struct ibmvfc_target *tgt;
4217 
4218         if (kthread_should_stop())
4219                 return 1;
4220         switch (vhost->action) {
4221         case IBMVFC_HOST_ACTION_NONE:
4222         case IBMVFC_HOST_ACTION_INIT_WAIT:
4223         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4224                 return 0;
4225         case IBMVFC_HOST_ACTION_TGT_INIT:
4226         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4227                 if (vhost->discovery_threads == disc_threads)
4228                         return 0;
4229                 list_for_each_entry(tgt, &vhost->targets, queue)
4230                         if (tgt->action == IBMVFC_TGT_ACTION_INIT)
4231                                 return 1;
4232                 list_for_each_entry(tgt, &vhost->targets, queue)
4233                         if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
4234                                 return 0;
4235                 return 1;
4236         case IBMVFC_HOST_ACTION_LOGO:
4237         case IBMVFC_HOST_ACTION_INIT:
4238         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4239         case IBMVFC_HOST_ACTION_TGT_DEL:
4240         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4241         case IBMVFC_HOST_ACTION_QUERY:
4242         case IBMVFC_HOST_ACTION_RESET:
4243         case IBMVFC_HOST_ACTION_REENABLE:
4244         default:
4245                 break;
4246         };
4247 
4248         return 1;
4249 }
4250 
4251 /**
4252  * ibmvfc_work_to_do - Is there task level work to do?
4253  * @vhost:              ibmvfc host struct
4254  *
4255  * Returns:
4256  *      1 if work to do / 0 if not
4257  **/
4258 static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
4259 {
4260         unsigned long flags;
4261         int rc;
4262 
4263         spin_lock_irqsave(vhost->host->host_lock, flags);
4264         rc = __ibmvfc_work_to_do(vhost);
4265         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4266         return rc;
4267 }
4268 
4269 /**
4270  * ibmvfc_log_ae - Log async events if necessary
4271  * @vhost:              ibmvfc host struct
4272  * @events:             events to log
4273  *
4274  **/
4275 static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
4276 {
4277         if (events & IBMVFC_AE_RSCN)
4278                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
4279         if ((events & IBMVFC_AE_LINKDOWN) &&
4280             vhost->state >= IBMVFC_HALTED)
4281                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
4282         if ((events & IBMVFC_AE_LINKUP) &&
4283             vhost->state == IBMVFC_INITIALIZING)
4284                 fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
4285 }
4286 
4287 /**
4288  * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
4289  * @tgt:                ibmvfc target struct
4290  *
4291  **/
4292 static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
4293 {
4294         struct ibmvfc_host *vhost = tgt->vhost;
4295         struct fc_rport *rport;
4296         unsigned long flags;
4297 
4298         tgt_dbg(tgt, "Adding rport\n");
4299         rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
4300         spin_lock_irqsave(vhost->host->host_lock, flags);
4301 
4302         if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4303                 tgt_dbg(tgt, "Deleting rport\n");
4304                 list_del(&tgt->queue);
4305                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4306                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4307                 fc_remote_port_delete(rport);
4308                 del_timer_sync(&tgt->timer);
4309                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4310                 return;
4311         } else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
4312                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4313                 return;
4314         }
4315 
4316         if (rport) {
4317                 tgt_dbg(tgt, "rport add succeeded\n");
4318                 tgt->rport = rport;
4319                 rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
4320                 rport->supported_classes = 0;
4321                 tgt->target_id = rport->scsi_target_id;
4322                 if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
4323                         rport->supported_classes |= FC_COS_CLASS1;
4324                 if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
4325                         rport->supported_classes |= FC_COS_CLASS2;
4326                 if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
4327                         rport->supported_classes |= FC_COS_CLASS3;
4328                 if (rport->rqst_q)
4329                         blk_queue_max_segments(rport->rqst_q, 1);
4330         } else
4331                 tgt_dbg(tgt, "rport add failed\n");
4332         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4333 }
4334 
4335 /**
4336  * ibmvfc_do_work - Do task level work
4337  * @vhost:              ibmvfc host struct
4338  *
4339  **/
4340 static void ibmvfc_do_work(struct ibmvfc_host *vhost)
4341 {
4342         struct ibmvfc_target *tgt;
4343         unsigned long flags;
4344         struct fc_rport *rport;
4345         int rc;
4346 
4347         ibmvfc_log_ae(vhost, vhost->events_to_log);
4348         spin_lock_irqsave(vhost->host->host_lock, flags);
4349         vhost->events_to_log = 0;
4350         switch (vhost->action) {
4351         case IBMVFC_HOST_ACTION_NONE:
4352         case IBMVFC_HOST_ACTION_LOGO_WAIT:
4353         case IBMVFC_HOST_ACTION_INIT_WAIT:
4354                 break;
4355         case IBMVFC_HOST_ACTION_RESET:
4356                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4357                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4358                 rc = ibmvfc_reset_crq(vhost);
4359                 spin_lock_irqsave(vhost->host->host_lock, flags);
4360                 if (rc == H_CLOSED)
4361                         vio_enable_interrupts(to_vio_dev(vhost->dev));
4362                 if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
4363                     (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
4364                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4365                         dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
4366                 }
4367                 break;
4368         case IBMVFC_HOST_ACTION_REENABLE:
4369                 vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
4370                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4371                 rc = ibmvfc_reenable_crq_queue(vhost);
4372                 spin_lock_irqsave(vhost->host->host_lock, flags);
4373                 if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
4374                         ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4375                         dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
4376                 }
4377                 break;
4378         case IBMVFC_HOST_ACTION_LOGO:
4379                 vhost->job_step(vhost);
4380                 break;
4381         case IBMVFC_HOST_ACTION_INIT:
4382                 BUG_ON(vhost->state != IBMVFC_INITIALIZING);
4383                 if (vhost->delay_init) {
4384                         vhost->delay_init = 0;
4385                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4386                         ssleep(15);
4387                         return;
4388                 } else
4389                         vhost->job_step(vhost);
4390                 break;
4391         case IBMVFC_HOST_ACTION_QUERY:
4392                 list_for_each_entry(tgt, &vhost->targets, queue)
4393                         ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
4394                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
4395                 break;
4396         case IBMVFC_HOST_ACTION_QUERY_TGTS:
4397                 list_for_each_entry(tgt, &vhost->targets, queue) {
4398                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4399                                 tgt->job_step(tgt);
4400                                 break;
4401                         }
4402                 }
4403 
4404                 if (!ibmvfc_dev_init_to_do(vhost))
4405                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
4406                 break;
4407         case IBMVFC_HOST_ACTION_TGT_DEL:
4408         case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
4409                 list_for_each_entry(tgt, &vhost->targets, queue) {
4410                         if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
4411                                 tgt_dbg(tgt, "Deleting rport\n");
4412                                 rport = tgt->rport;
4413                                 tgt->rport = NULL;
4414                                 list_del(&tgt->queue);
4415                                 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
4416                                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4417                                 if (rport)
4418                                         fc_remote_port_delete(rport);
4419                                 del_timer_sync(&tgt->timer);
4420                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4421                                 return;
4422                         }
4423                 }
4424 
4425                 if (vhost->state == IBMVFC_INITIALIZING) {
4426                         if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
4427                                 if (vhost->reinit) {
4428                                         vhost->reinit = 0;
4429                                         scsi_block_requests(vhost->host);
4430                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
4431                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4432                                 } else {
4433                                         ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
4434                                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4435                                         wake_up(&vhost->init_wait_q);
4436                                         schedule_work(&vhost->rport_add_work_q);
4437                                         vhost->init_retries = 0;
4438                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4439                                         scsi_unblock_requests(vhost->host);
4440                                 }
4441 
4442                                 return;
4443                         } else {
4444                                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
4445                                 vhost->job_step = ibmvfc_discover_targets;
4446                         }
4447                 } else {
4448                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
4449                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4450                         scsi_unblock_requests(vhost->host);
4451                         wake_up(&vhost->init_wait_q);
4452                         return;
4453                 }
4454                 break;
4455         case IBMVFC_HOST_ACTION_ALLOC_TGTS:
4456                 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
4457                 spin_unlock_irqrestore(vhost->host->host_lock, flags);
4458                 ibmvfc_alloc_targets(vhost);
4459                 spin_lock_irqsave(vhost->host->host_lock, flags);
4460                 break;
4461         case IBMVFC_HOST_ACTION_TGT_INIT:
4462                 list_for_each_entry(tgt, &vhost->targets, queue) {
4463                         if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
4464                                 tgt->job_step(tgt);
4465                                 break;
4466                         }
4467                 }
4468 
4469                 if (!ibmvfc_dev_init_to_do(vhost))
4470                         ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
4471                 break;
4472         default:
4473                 break;
4474         };
4475 
4476         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4477 }
4478 
4479 /**
4480  * ibmvfc_work - Do task level work
4481  * @data:               ibmvfc host struct
4482  *
4483  * Returns:
4484  *      zero
4485  **/
4486 static int ibmvfc_work(void *data)
4487 {
4488         struct ibmvfc_host *vhost = data;
4489         int rc;
4490 
4491         set_user_nice(current, MIN_NICE);
4492 
4493         while (1) {
4494                 rc = wait_event_interruptible(vhost->work_wait_q,
4495                                               ibmvfc_work_to_do(vhost));
4496 
4497                 BUG_ON(rc);
4498 
4499                 if (kthread_should_stop())
4500                         break;
4501 
4502                 ibmvfc_do_work(vhost);
4503         }
4504 
4505         ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
4506         return 0;
4507 }
4508 
4509 /**
4510  * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
4511  * @vhost:      ibmvfc host struct
4512  *
4513  * Allocates a page for messages, maps it for dma, and registers
4514  * the crq with the hypervisor.
4515  *
4516  * Return value:
4517  *      zero on success / other on failure
4518  **/
4519 static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
4520 {
4521         int rc, retrc = -ENOMEM;
4522         struct device *dev = vhost->dev;
4523         struct vio_dev *vdev = to_vio_dev(dev);
4524         struct ibmvfc_crq_queue *crq = &vhost->crq;
4525 
4526         ENTER;
4527         crq->msgs = (struct ibmvfc_crq *)get_zeroed_page(GFP_KERNEL);
4528 
4529         if (!crq->msgs)
4530                 return -ENOMEM;
4531 
4532         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
4533         crq->msg_token = dma_map_single(dev, crq->msgs,
4534                                         PAGE_SIZE, DMA_BIDIRECTIONAL);
4535 
4536         if (dma_mapping_error(dev, crq->msg_token))
4537                 goto map_failed;
4538 
4539         retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
4540                                         crq->msg_token, PAGE_SIZE);
4541 
4542         if (rc == H_RESOURCE)
4543                 /* maybe kexecing and resource is busy. try a reset */
4544                 retrc = rc = ibmvfc_reset_crq(vhost);
4545 
4546         if (rc == H_CLOSED)
4547                 dev_warn(dev, "Partner adapter not ready\n");
4548         else if (rc) {
4549                 dev_warn(dev, "Error %d opening adapter\n", rc);
4550                 goto reg_crq_failed;
4551         }
4552 
4553         retrc = 0;
4554 
4555         tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
4556 
4557         if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
4558                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
4559                 goto req_irq_failed;
4560         }
4561 
4562         if ((rc = vio_enable_interrupts(vdev))) {
4563                 dev_err(dev, "Error %d enabling interrupts\n", rc);
4564                 goto req_irq_failed;
4565         }
4566 
4567         crq->cur = 0;
4568         LEAVE;
4569         return retrc;
4570 
4571 req_irq_failed:
4572         tasklet_kill(&vhost->tasklet);
4573         do {
4574                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
4575         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
4576 reg_crq_failed:
4577         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
4578 map_failed:
4579         free_page((unsigned long)crq->msgs);
4580         return retrc;
4581 }
4582 
4583 /**
4584  * ibmvfc_free_mem - Free memory for vhost
4585  * @vhost:      ibmvfc host struct
4586  *
4587  * Return value:
4588  *      none
4589  **/
4590 static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
4591 {
4592         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4593 
4594         ENTER;
4595         mempool_destroy(vhost->tgt_pool);
4596         kfree(vhost->trace);
4597         dma_free_coherent(vhost->dev, vhost->disc_buf_sz, vhost->disc_buf,
4598                           vhost->disc_buf_dma);
4599         dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
4600                           vhost->login_buf, vhost->login_buf_dma);
4601         dma_pool_destroy(vhost->sg_pool);
4602         dma_unmap_single(vhost->dev, async_q->msg_token,
4603                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4604         free_page((unsigned long)async_q->msgs);
4605         LEAVE;
4606 }
4607 
4608 /**
4609  * ibmvfc_alloc_mem - Allocate memory for vhost
4610  * @vhost:      ibmvfc host struct
4611  *
4612  * Return value:
4613  *      0 on success / non-zero on failure
4614  **/
4615 static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
4616 {
4617         struct ibmvfc_async_crq_queue *async_q = &vhost->async_crq;
4618         struct device *dev = vhost->dev;
4619 
4620         ENTER;
4621         async_q->msgs = (struct ibmvfc_async_crq *)get_zeroed_page(GFP_KERNEL);
4622         if (!async_q->msgs) {
4623                 dev_err(dev, "Couldn't allocate async queue.\n");
4624                 goto nomem;
4625         }
4626 
4627         async_q->size = PAGE_SIZE / sizeof(struct ibmvfc_async_crq);
4628         async_q->msg_token = dma_map_single(dev, async_q->msgs,
4629                                             async_q->size * sizeof(*async_q->msgs),
4630                                             DMA_BIDIRECTIONAL);
4631 
4632         if (dma_mapping_error(dev, async_q->msg_token)) {
4633                 dev_err(dev, "Failed to map async queue\n");
4634                 goto free_async_crq;
4635         }
4636 
4637         vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
4638                                          SG_ALL * sizeof(struct srp_direct_buf),
4639                                          sizeof(struct srp_direct_buf), 0);
4640 
4641         if (!vhost->sg_pool) {
4642                 dev_err(dev, "Failed to allocate sg pool\n");
4643                 goto unmap_async_crq;
4644         }
4645 
4646         vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
4647                                               &vhost->login_buf_dma, GFP_KERNEL);
4648 
4649         if (!vhost->login_buf) {
4650                 dev_err(dev, "Couldn't allocate NPIV login buffer\n");
4651                 goto free_sg_pool;
4652         }
4653 
4654         vhost->disc_buf_sz = sizeof(vhost->disc_buf->scsi_id[0]) * max_targets;
4655         vhost->disc_buf = dma_alloc_coherent(dev, vhost->disc_buf_sz,
4656                                              &vhost->disc_buf_dma, GFP_KERNEL);
4657 
4658         if (!vhost->disc_buf) {
4659                 dev_err(dev, "Couldn't allocate Discover Targets buffer\n");
4660                 goto free_login_buffer;
4661         }
4662 
4663         vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
4664                                sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
4665 
4666         if (!vhost->trace)
4667                 goto free_disc_buffer;
4668 
4669         vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
4670                                                       sizeof(struct ibmvfc_target));
4671 
4672         if (!vhost->tgt_pool) {
4673                 dev_err(dev, "Couldn't allocate target memory pool\n");
4674                 goto free_trace;
4675         }
4676 
4677         LEAVE;
4678         return 0;
4679 
4680 free_trace:
4681         kfree(vhost->trace);
4682 free_disc_buffer:
4683         dma_free_coherent(dev, vhost->disc_buf_sz, vhost->disc_buf,
4684                           vhost->disc_buf_dma);
4685 free_login_buffer:
4686         dma_free_coherent(dev, sizeof(*vhost->login_buf),
4687                           vhost->login_buf, vhost->login_buf_dma);
4688 free_sg_pool:
4689         dma_pool_destroy(vhost->sg_pool);
4690 unmap_async_crq:
4691         dma_unmap_single(dev, async_q->msg_token,
4692                          async_q->size * sizeof(*async_q->msgs), DMA_BIDIRECTIONAL);
4693 free_async_crq:
4694         free_page((unsigned long)async_q->msgs);
4695 nomem:
4696         LEAVE;
4697         return -ENOMEM;
4698 }
4699 
4700 /**
4701  * ibmvfc_rport_add_thread - Worker thread for rport adds
4702  * @work:       work struct
4703  *
4704  **/
4705 static void ibmvfc_rport_add_thread(struct work_struct *work)
4706 {
4707         struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
4708                                                  rport_add_work_q);
4709         struct ibmvfc_target *tgt;
4710         struct fc_rport *rport;
4711         unsigned long flags;
4712         int did_work;
4713 
4714         ENTER;
4715         spin_lock_irqsave(vhost->host->host_lock, flags);
4716         do {
4717                 did_work = 0;
4718                 if (vhost->state != IBMVFC_ACTIVE)
4719                         break;
4720 
4721                 list_for_each_entry(tgt, &vhost->targets, queue) {
4722                         if (tgt->add_rport) {
4723                                 did_work = 1;
4724                                 tgt->add_rport = 0;
4725                                 kref_get(&tgt->kref);
4726                                 rport = tgt->rport;
4727                                 if (!rport) {
4728                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4729                                         ibmvfc_tgt_add_rport(tgt);
4730                                 } else if (get_device(&rport->dev)) {
4731                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4732                                         tgt_dbg(tgt, "Setting rport roles\n");
4733                                         fc_remote_port_rolechg(rport, tgt->ids.roles);
4734                                         put_device(&rport->dev);
4735                                 } else {
4736                                         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4737                                 }
4738 
4739                                 kref_put(&tgt->kref, ibmvfc_release_tgt);
4740                                 spin_lock_irqsave(vhost->host->host_lock, flags);
4741                                 break;
4742                         }
4743                 }
4744         } while(did_work);
4745 
4746         if (vhost->state == IBMVFC_ACTIVE)
4747                 vhost->scan_complete = 1;
4748         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4749         LEAVE;
4750 }
4751 
4752 /**
4753  * ibmvfc_probe - Adapter hot plug add entry point
4754  * @vdev:       vio device struct
4755  * @id: vio device id struct
4756  *
4757  * Return value:
4758  *      0 on success / non-zero on failure
4759  **/
4760 static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
4761 {
4762         struct ibmvfc_host *vhost;
4763         struct Scsi_Host *shost;
4764         struct device *dev = &vdev->dev;
4765         int rc = -ENOMEM;
4766 
4767         ENTER;
4768         shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
4769         if (!shost) {
4770                 dev_err(dev, "Couldn't allocate host data\n");
4771                 goto out;
4772         }
4773 
4774         shost->transportt = ibmvfc_transport_template;
4775         shost->can_queue = max_requests;
4776         shost->max_lun = max_lun;
4777         shost->max_id = max_targets;
4778         shost->max_sectors = IBMVFC_MAX_SECTORS;
4779         shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
4780         shost->unique_id = shost->host_no;
4781 
4782         vhost = shost_priv(shost);
4783         INIT_LIST_HEAD(&vhost->sent);
4784         INIT_LIST_HEAD(&vhost->free);
4785         INIT_LIST_HEAD(&vhost->targets);
4786         sprintf(vhost->name, IBMVFC_NAME);
4787         vhost->host = shost;
4788         vhost->dev = dev;
4789         vhost->partition_number = -1;
4790         vhost->log_level = log_level;
4791         vhost->task_set = 1;
4792         strcpy(vhost->partition_name, "UNKNOWN");
4793         init_waitqueue_head(&vhost->work_wait_q);
4794         init_waitqueue_head(&vhost->init_wait_q);
4795         INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
4796         mutex_init(&vhost->passthru_mutex);
4797 
4798         if ((rc = ibmvfc_alloc_mem(vhost)))
4799                 goto free_scsi_host;
4800 
4801         vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
4802                                          shost->host_no);
4803 
4804         if (IS_ERR(vhost->work_thread)) {
4805                 dev_err(dev, "Couldn't create kernel thread: %ld\n",
4806                         PTR_ERR(vhost->work_thread));
4807                 goto free_host_mem;
4808         }
4809 
4810         if ((rc = ibmvfc_init_crq(vhost))) {
4811                 dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
4812                 goto kill_kthread;
4813         }
4814 
4815         if ((rc = ibmvfc_init_event_pool(vhost))) {
4816                 dev_err(dev, "Couldn't initialize event pool. rc=%d\n", rc);
4817                 goto release_crq;
4818         }
4819 
4820         if ((rc = scsi_add_host(shost, dev)))
4821                 goto release_event_pool;
4822 
4823         fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
4824 
4825         if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
4826                                            &ibmvfc_trace_attr))) {
4827                 dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
4828                 goto remove_shost;
4829         }
4830 
4831         if (shost_to_fc_host(shost)->rqst_q)
4832                 blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
4833         dev_set_drvdata(dev, vhost);
4834         spin_lock(&ibmvfc_driver_lock);
4835         list_add_tail(&vhost->queue, &ibmvfc_head);
4836         spin_unlock(&ibmvfc_driver_lock);
4837 
4838         ibmvfc_send_crq_init(vhost);
4839         scsi_scan_host(shost);
4840         return 0;
4841 
4842 remove_shost:
4843         scsi_remove_host(shost);
4844 release_event_pool:
4845         ibmvfc_free_event_pool(vhost);
4846 release_crq:
4847         ibmvfc_release_crq_queue(vhost);
4848 kill_kthread:
4849         kthread_stop(vhost->work_thread);
4850 free_host_mem:
4851         ibmvfc_free_mem(vhost);
4852 free_scsi_host:
4853         scsi_host_put(shost);
4854 out:
4855         LEAVE;
4856         return rc;
4857 }
4858 
4859 /**
4860  * ibmvfc_remove - Adapter hot plug remove entry point
4861  * @vdev:       vio device struct
4862  *
4863  * Return value:
4864  *      0
4865  **/
4866 static int ibmvfc_remove(struct vio_dev *vdev)
4867 {
4868         struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
4869         unsigned long flags;
4870 
4871         ENTER;
4872         ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
4873 
4874         spin_lock_irqsave(vhost->host->host_lock, flags);
4875         ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
4876         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4877 
4878         ibmvfc_wait_while_resetting(vhost);
4879         ibmvfc_release_crq_queue(vhost);
4880         kthread_stop(vhost->work_thread);
4881         fc_remove_host(vhost->host);
4882         scsi_remove_host(vhost->host);
4883 
4884         spin_lock_irqsave(vhost->host->host_lock, flags);
4885         ibmvfc_purge_requests(vhost, DID_ERROR);
4886         ibmvfc_free_event_pool(vhost);
4887         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4888 
4889         ibmvfc_free_mem(vhost);
4890         spin_lock(&ibmvfc_driver_lock);
4891         list_del(&vhost->queue);
4892         spin_unlock(&ibmvfc_driver_lock);
4893         scsi_host_put(vhost->host);
4894         LEAVE;
4895         return 0;
4896 }
4897 
4898 /**
4899  * ibmvfc_resume - Resume from suspend
4900  * @dev:        device struct
4901  *
4902  * We may have lost an interrupt across suspend/resume, so kick the
4903  * interrupt handler
4904  *
4905  */
4906 static int ibmvfc_resume(struct device *dev)
4907 {
4908         unsigned long flags;
4909         struct ibmvfc_host *vhost = dev_get_drvdata(dev);
4910         struct vio_dev *vdev = to_vio_dev(dev);
4911 
4912         spin_lock_irqsave(vhost->host->host_lock, flags);
4913         vio_disable_interrupts(vdev);
4914         tasklet_schedule(&vhost->tasklet);
4915         spin_unlock_irqrestore(vhost->host->host_lock, flags);
4916         return 0;
4917 }
4918 
4919 /**
4920  * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
4921  * @vdev:       vio device struct
4922  *
4923  * Return value:
4924  *      Number of bytes the driver will need to DMA map at the same time in
4925  *      order to perform well.
4926  */
4927 static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
4928 {
4929         unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu);
4930         return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
4931 }
4932 
4933 static struct vio_device_id ibmvfc_device_table[] = {
4934         {"fcp", "IBM,vfc-client"},
4935         { "", "" }
4936 };
4937 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
4938 
4939 static struct dev_pm_ops ibmvfc_pm_ops = {
4940         .resume = ibmvfc_resume
4941 };
4942 
4943 static struct vio_driver ibmvfc_driver = {
4944         .id_table = ibmvfc_device_table,
4945         .probe = ibmvfc_probe,
4946         .remove = ibmvfc_remove,
4947         .get_desired_dma = ibmvfc_get_desired_dma,
4948         .name = IBMVFC_NAME,
4949         .pm = &ibmvfc_pm_ops,
4950 };
4951 
4952 static struct fc_function_template ibmvfc_transport_functions = {
4953         .show_host_fabric_name = 1,
4954         .show_host_node_name = 1,
4955         .show_host_port_name = 1,
4956         .show_host_supported_classes = 1,
4957         .show_host_port_type = 1,
4958         .show_host_port_id = 1,
4959         .show_host_maxframe_size = 1,
4960 
4961         .get_host_port_state = ibmvfc_get_host_port_state,
4962         .show_host_port_state = 1,
4963 
4964         .get_host_speed = ibmvfc_get_host_speed,
4965         .show_host_speed = 1,
4966 
4967         .issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
4968         .terminate_rport_io = ibmvfc_terminate_rport_io,
4969 
4970         .show_rport_maxframe_size = 1,
4971         .show_rport_supported_classes = 1,
4972 
4973         .set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
4974         .show_rport_dev_loss_tmo = 1,
4975 
4976         .get_starget_node_name = ibmvfc_get_starget_node_name,
4977         .show_starget_node_name = 1,
4978 
4979         .get_starget_port_name = ibmvfc_get_starget_port_name,
4980         .show_starget_port_name = 1,
4981 
4982         .get_starget_port_id = ibmvfc_get_starget_port_id,
4983         .show_starget_port_id = 1,
4984 
4985         .bsg_request = ibmvfc_bsg_request,
4986         .bsg_timeout = ibmvfc_bsg_timeout,
4987 };
4988 
4989 /**
4990  * ibmvfc_module_init - Initialize the ibmvfc module
4991  *
4992  * Return value:
4993  *      0 on success / other on failure
4994  **/
4995 static int __init ibmvfc_module_init(void)
4996 {
4997         int rc;
4998 
4999         if (!firmware_has_feature(FW_FEATURE_VIO))
5000                 return -ENODEV;
5001 
5002         printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
5003                IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
5004 
5005         ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
5006         if (!ibmvfc_transport_template)
5007                 return -ENOMEM;
5008 
5009         rc = vio_register_driver(&ibmvfc_driver);
5010         if (rc)
5011                 fc_release_transport(ibmvfc_transport_template);
5012         return rc;
5013 }
5014 
5015 /**
5016  * ibmvfc_module_exit - Teardown the ibmvfc module
5017  *
5018  * Return value:
5019  *      nothing
5020  **/
5021 static void __exit ibmvfc_module_exit(void)
5022 {
5023         vio_unregister_driver(&ibmvfc_driver);
5024         fc_release_transport(ibmvfc_transport_template);
5025 }
5026 
5027 module_init(ibmvfc_module_init);
5028 module_exit(ibmvfc_module_exit);
5029 

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