drivers/s390/scsi/zfcp_dbf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Debug traces for zfcp.
   5  *
   6  * Copyright IBM Corp. 2002, 2015
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/ctype.h>
  14 #include <linux/slab.h>
  15 #include <asm/debug.h>
  16 #include "zfcp_dbf.h"
  17 #include "zfcp_ext.h"
  18 #include "zfcp_fc.h"
  19
  20 static u32 dbfsize = 4;
  21
  22 module_param(dbfsize, uint, 0400);
  23 MODULE_PARM_DESC(dbfsize,
  24                  "number of pages for each debug feature area (default 4)");
  25
  26 static inline unsigned int zfcp_dbf_plen(unsigned int offset)
  27 {
  28         return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
  29 }
  30
  31 static inline
  32 void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
  33                        u64 req_id)
  34 {
  35         struct zfcp_dbf_pay *pl = &dbf->pay_buf;
  36         u16 offset = 0, rec_length;
  37
  38         spin_lock(&dbf->pay_lock);
  39         memset(pl, 0, sizeof(*pl));
  40         pl->fsf_req_id = req_id;
  41         memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
  42
  43         while (offset < length) {
  44                 rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
  45                                  (u16) (length - offset));
  46                 memcpy(pl->data, data + offset, rec_length);
  47                 debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
  48
  49                 offset += rec_length;
  50                 pl->counter++;
  51         }
  52
  53         spin_unlock(&dbf->pay_lock);
  54 }
  55
  56 /**
  57  * zfcp_dbf_hba_fsf_res - trace event for fsf responses
  58  * @tag: tag indicating which kind of unsolicited status has been received
  59  * @req: request for which a response was received
  60  */
  61 void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
  62 {
  63         struct zfcp_dbf *dbf = req->adapter->dbf;
  64         struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
  65         struct fsf_qtcb_header *q_head = &req->qtcb->header;
  66         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
  67         unsigned long flags;
  68
  69         spin_lock_irqsave(&dbf->hba_lock, flags);
  70         memset(rec, 0, sizeof(*rec));
  71
  72         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
  73         rec->id = ZFCP_DBF_HBA_RES;
  74         rec->fsf_req_id = req->req_id;
  75         rec->fsf_req_status = req->status;
  76         rec->fsf_cmd = req->fsf_command;
  77         rec->fsf_seq_no = req->seq_no;
  78         rec->u.res.req_issued = req->issued;
  79         rec->u.res.prot_status = q_pref->prot_status;
  80         rec->u.res.fsf_status = q_head->fsf_status;
  81         rec->u.res.port_handle = q_head->port_handle;
  82         rec->u.res.lun_handle = q_head->lun_handle;
  83
  84         memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
  85                FSF_PROT_STATUS_QUAL_SIZE);
  86         memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
  87                FSF_STATUS_QUALIFIER_SIZE);
  88
  89         if (req->fsf_command != FSF_QTCB_FCP_CMND) {
  90                 rec->pl_len = q_head->log_length;
  91                 zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
  92                                   rec->pl_len, "fsf_res", req->req_id);
  93         }
  94
  95         debug_event(dbf->hba, level, rec, sizeof(*rec));
  96         spin_unlock_irqrestore(&dbf->hba_lock, flags);
  97 }
  98
  99 /**
 100  * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
 101  * @tag: tag indicating which kind of unsolicited status has been received
 102  * @req: request providing the unsolicited status
 103  */
 104 void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 105 {
 106         struct zfcp_dbf *dbf = req->adapter->dbf;
 107         struct fsf_status_read_buffer *srb = req->data;
 108         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 109         unsigned long flags;
 110
 111         spin_lock_irqsave(&dbf->hba_lock, flags);
 112         memset(rec, 0, sizeof(*rec));
 113
 114         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 115         rec->id = ZFCP_DBF_HBA_USS;
 116         rec->fsf_req_id = req->req_id;
 117         rec->fsf_req_status = req->status;
 118         rec->fsf_cmd = req->fsf_command;
 119
 120         if (!srb)
 121                 goto log;
 122
 123         rec->u.uss.status_type = srb->status_type;
 124         rec->u.uss.status_subtype = srb->status_subtype;
 125         rec->u.uss.d_id = ntoh24(srb->d_id);
 126         rec->u.uss.lun = srb->fcp_lun;
 127         memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
 128                sizeof(rec->u.uss.queue_designator));
 129
 130         /* status read buffer payload length */
 131         rec->pl_len = (!srb->length) ? 0 : srb->length -
 132                         offsetof(struct fsf_status_read_buffer, payload);
 133
 134         if (rec->pl_len)
 135                 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
 136                                   "fsf_uss", req->req_id);
 137 log:
 138         debug_event(dbf->hba, 2, rec, sizeof(*rec));
 139         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 140 }
 141
 142 /**
 143  * zfcp_dbf_hba_bit_err - trace event for bit error conditions
 144  * @tag: tag indicating which kind of unsolicited status has been received
 145  * @req: request which caused the bit_error condition
 146  */
 147 void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
 148 {
 149         struct zfcp_dbf *dbf = req->adapter->dbf;
 150         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 151         struct fsf_status_read_buffer *sr_buf = req->data;
 152         unsigned long flags;
 153
 154         spin_lock_irqsave(&dbf->hba_lock, flags);
 155         memset(rec, 0, sizeof(*rec));
 156
 157         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 158         rec->id = ZFCP_DBF_HBA_BIT;
 159         rec->fsf_req_id = req->req_id;
 160         rec->fsf_req_status = req->status;
 161         rec->fsf_cmd = req->fsf_command;
 162         memcpy(&rec->u.be, &sr_buf->payload.bit_error,
 163                sizeof(struct fsf_bit_error_payload));
 164
 165         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 166         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 167 }
 168
 169 /**
 170  * zfcp_dbf_hba_def_err - trace event for deferred error messages
 171  * @adapter: pointer to struct zfcp_adapter
 172  * @req_id: request id which caused the deferred error message
 173  * @scount: number of sbals incl. the signaling sbal
 174  * @pl: array of all involved sbals
 175  */
 176 void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
 177                           void **pl)
 178 {
 179         struct zfcp_dbf *dbf = adapter->dbf;
 180         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 181         unsigned long flags;
 182         u16 length;
 183
 184         if (!pl)
 185                 return;
 186
 187         spin_lock_irqsave(&dbf->pay_lock, flags);
 188         memset(payload, 0, sizeof(*payload));
 189
 190         memcpy(payload->area, "def_err", 7);
 191         payload->fsf_req_id = req_id;
 192         payload->counter = 0;
 193         length = min((u16)sizeof(struct qdio_buffer),
 194                      (u16)ZFCP_DBF_PAY_MAX_REC);
 195
 196         while (payload->counter < scount && (char *)pl[payload->counter]) {
 197                 memcpy(payload->data, (char *)pl[payload->counter], length);
 198                 debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
 199                 payload->counter++;
 200         }
 201
 202         spin_unlock_irqrestore(&dbf->pay_lock, flags);
 203 }
 204
 205 /**
 206  * zfcp_dbf_hba_basic - trace event for basic adapter events
 207  * @adapter: pointer to struct zfcp_adapter
 208  */
 209 void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
 210 {
 211         struct zfcp_dbf *dbf = adapter->dbf;
 212         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 213         unsigned long flags;
 214
 215         spin_lock_irqsave(&dbf->hba_lock, flags);
 216         memset(rec, 0, sizeof(*rec));
 217
 218         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 219         rec->id = ZFCP_DBF_HBA_BASIC;
 220
 221         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 222         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 223 }
 224
 225 static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
 226                                 struct zfcp_adapter *adapter,
 227                                 struct zfcp_port *port,
 228                                 struct scsi_device *sdev)
 229 {
 230         rec->adapter_status = atomic_read(&adapter->status);
 231         if (port) {
 232                 rec->port_status = atomic_read(&port->status);
 233                 rec->wwpn = port->wwpn;
 234                 rec->d_id = port->d_id;
 235         }
 236         if (sdev) {
 237                 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
 238                 rec->lun = zfcp_scsi_dev_lun(sdev);
 239         } else
 240                 rec->lun = ZFCP_DBF_INVALID_LUN;
 241 }
 242
 243 /**
 244  * zfcp_dbf_rec_trig - trace event related to triggered recovery
 245  * @tag: identifier for event
 246  * @adapter: adapter on which the erp_action should run
 247  * @port: remote port involved in the erp_action
 248  * @sdev: scsi device involved in the erp_action
 249  * @want: wanted erp_action
 250  * @need: required erp_action
 251  *
 252  * The adapter->erp_lock has to be held.
 253  */
 254 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
 255                        struct zfcp_port *port, struct scsi_device *sdev,
 256                        u8 want, u8 need)
 257 {
 258         struct zfcp_dbf *dbf = adapter->dbf;
 259         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 260         struct list_head *entry;
 261         unsigned long flags;
 262
 263         spin_lock_irqsave(&dbf->rec_lock, flags);
 264         memset(rec, 0, sizeof(*rec));
 265
 266         rec->id = ZFCP_DBF_REC_TRIG;
 267         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 268         zfcp_dbf_set_common(rec, adapter, port, sdev);
 269
 270         list_for_each(entry, &adapter->erp_ready_head)
 271                 rec->u.trig.ready++;
 272
 273         list_for_each(entry, &adapter->erp_running_head)
 274                 rec->u.trig.running++;
 275
 276         rec->u.trig.want = want;
 277         rec->u.trig.need = need;
 278
 279         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 280         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 281 }
 282
 283
 284 /**
 285  * zfcp_dbf_rec_run - trace event related to running recovery
 286  * @tag: identifier for event
 287  * @erp: erp_action running
 288  */
 289 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
 290 {
 291         struct zfcp_dbf *dbf = erp->adapter->dbf;
 292         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 293         unsigned long flags;
 294
 295         spin_lock_irqsave(&dbf->rec_lock, flags);
 296         memset(rec, 0, sizeof(*rec));
 297
 298         rec->id = ZFCP_DBF_REC_RUN;
 299         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 300         zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
 301
 302         rec->u.run.fsf_req_id = erp->fsf_req_id;
 303         rec->u.run.rec_status = erp->status;
 304         rec->u.run.rec_step = erp->step;
 305         rec->u.run.rec_action = erp->action;
 306
 307         if (erp->sdev)
 308                 rec->u.run.rec_count =
 309                         atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
 310         else if (erp->port)
 311                 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
 312         else
 313                 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
 314
 315         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 316         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 317 }
 318
 319 /**
 320  * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
 321  * @tag: identifier for event
 322  * @wka_port: well known address port
 323  * @req_id: request ID to correlate with potential HBA trace record
 324  */
 325 void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
 326                           u64 req_id)
 327 {
 328         struct zfcp_dbf *dbf = wka_port->adapter->dbf;
 329         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 330         unsigned long flags;
 331
 332         spin_lock_irqsave(&dbf->rec_lock, flags);
 333         memset(rec, 0, sizeof(*rec));
 334
 335         rec->id = ZFCP_DBF_REC_RUN;
 336         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 337         rec->port_status = wka_port->status;
 338         rec->d_id = wka_port->d_id;
 339         rec->lun = ZFCP_DBF_INVALID_LUN;
 340
 341         rec->u.run.fsf_req_id = req_id;
 342         rec->u.run.rec_status = ~0;
 343         rec->u.run.rec_step = ~0;
 344         rec->u.run.rec_action = ~0;
 345         rec->u.run.rec_count = ~0;
 346
 347         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 348         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 349 }
 350
 351 static inline
 352 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
 353                   u64 req_id, u32 d_id)
 354 {
 355         struct zfcp_dbf_san *rec = &dbf->san_buf;
 356         u16 rec_len;
 357         unsigned long flags;
 358
 359         spin_lock_irqsave(&dbf->san_lock, flags);
 360         memset(rec, 0, sizeof(*rec));
 361
 362         rec->id = id;
 363         rec->fsf_req_id = req_id;
 364         rec->d_id = d_id;
 365         rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
 366         memcpy(rec->payload, data, rec_len);
 367         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 368
 369         debug_event(dbf->san, 1, rec, sizeof(*rec));
 370         spin_unlock_irqrestore(&dbf->san_lock, flags);
 371 }
 372
 373 /**
 374  * zfcp_dbf_san_req - trace event for issued SAN request
 375  * @tag: indentifier for event
 376  * @fsf_req: request containing issued CT data
 377  * d_id: destination ID
 378  */
 379 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
 380 {
 381         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 382         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 383         u16 length;
 384
 385         length = (u16)(ct_els->req->length);
 386         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
 387                      fsf->req_id, d_id);
 388 }
 389
 390 /**
 391  * zfcp_dbf_san_res - trace event for received SAN request
 392  * @tag: indentifier for event
 393  * @fsf_req: request containing issued CT data
 394  */
 395 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 396 {
 397         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 398         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 399         u16 length;
 400
 401         length = (u16)(ct_els->resp->length);
 402         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
 403                      fsf->req_id, ct_els->d_id);
 404 }
 405
 406 /**
 407  * zfcp_dbf_san_in_els - trace event for incoming ELS
 408  * @tag: indentifier for event
 409  * @fsf_req: request containing issued CT data
 410  */
 411 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 412 {
 413         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 414         struct fsf_status_read_buffer *srb =
 415                 (struct fsf_status_read_buffer *) fsf->data;
 416         u16 length;
 417
 418         length = (u16)(srb->length -
 419                         offsetof(struct fsf_status_read_buffer, payload));
 420         zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
 421                      fsf->req_id, ntoh24(srb->d_id));
 422 }
 423
 424 /**
 425  * zfcp_dbf_scsi - trace event for scsi commands
 426  * @tag: identifier for event
 427  * @sc: pointer to struct scsi_cmnd
 428  * @fsf: pointer to struct zfcp_fsf_req
 429  */
 430 void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
 431                    struct zfcp_fsf_req *fsf)
 432 {
 433         struct zfcp_adapter *adapter =
 434                 (struct zfcp_adapter *) sc->device->host->hostdata[0];
 435         struct zfcp_dbf *dbf = adapter->dbf;
 436         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 437         struct fcp_resp_with_ext *fcp_rsp;
 438         struct fcp_resp_rsp_info *fcp_rsp_info;
 439         unsigned long flags;
 440
 441         spin_lock_irqsave(&dbf->scsi_lock, flags);
 442         memset(rec, 0, sizeof(*rec));
 443
 444         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 445         rec->id = ZFCP_DBF_SCSI_CMND;
 446         rec->scsi_result = sc->result;
 447         rec->scsi_retries = sc->retries;
 448         rec->scsi_allowed = sc->allowed;
 449         rec->scsi_id = sc->device->id;
 450         rec->scsi_lun = sc->device->lun;
 451         rec->host_scribble = (unsigned long)sc->host_scribble;
 452
 453         memcpy(rec->scsi_opcode, sc->cmnd,
 454                min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
 455
 456         if (fsf) {
 457                 rec->fsf_req_id = fsf->req_id;
 458                 fcp_rsp = (struct fcp_resp_with_ext *)
 459                                 &(fsf->qtcb->bottom.io.fcp_rsp);
 460                 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
 461                 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
 462                         fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 463                         rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
 464                 }
 465                 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
 466                         rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
 467                                           (u16)ZFCP_DBF_PAY_MAX_REC);
 468                         zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
 469                                           "fcp_sns", fsf->req_id);
 470                 }
 471         }
 472
 473         debug_event(dbf->scsi, level, rec, sizeof(*rec));
 474         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 475 }
 476
 477 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
 478 {
 479         struct debug_info *d;
 480
 481         d = debug_register(name, size, 1, rec_size);
 482         if (!d)
 483                 return NULL;
 484
 485         debug_register_view(d, &debug_hex_ascii_view);
 486         debug_set_level(d, 3);
 487
 488         return d;
 489 }
 490
 491 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
 492 {
 493         if (!dbf)
 494                 return;
 495
 496         debug_unregister(dbf->scsi);
 497         debug_unregister(dbf->san);
 498         debug_unregister(dbf->hba);
 499         debug_unregister(dbf->pay);
 500         debug_unregister(dbf->rec);
 501         kfree(dbf);
 502 }
 503
 504 /**
 505  * zfcp_adapter_debug_register - registers debug feature for an adapter
 506  * @adapter: pointer to adapter for which debug features should be registered
 507  * return: -ENOMEM on error, 0 otherwise
 508  */
 509 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
 510 {
 511         char name[DEBUG_MAX_NAME_LEN];
 512         struct zfcp_dbf *dbf;
 513
 514         dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
 515         if (!dbf)
 516                 return -ENOMEM;
 517
 518         spin_lock_init(&dbf->pay_lock);
 519         spin_lock_init(&dbf->hba_lock);
 520         spin_lock_init(&dbf->san_lock);
 521         spin_lock_init(&dbf->scsi_lock);
 522         spin_lock_init(&dbf->rec_lock);
 523
 524         /* debug feature area which records recovery activity */
 525         sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
 526         dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
 527         if (!dbf->rec)
 528                 goto err_out;
 529
 530         /* debug feature area which records HBA (FSF and QDIO) conditions */
 531         sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
 532         dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
 533         if (!dbf->hba)
 534                 goto err_out;
 535
 536         /* debug feature area which records payload info */
 537         sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
 538         dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
 539         if (!dbf->pay)
 540                 goto err_out;
 541
 542         /* debug feature area which records SAN command failures and recovery */
 543         sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
 544         dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
 545         if (!dbf->san)
 546                 goto err_out;
 547
 548         /* debug feature area which records SCSI command failures and recovery */
 549         sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
 550         dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
 551         if (!dbf->scsi)
 552                 goto err_out;
 553
 554         adapter->dbf = dbf;
 555
 556         return 0;
 557 err_out:
 558         zfcp_dbf_unregister(dbf);
 559         return -ENOMEM;
 560 }
 561
 562 /**
 563  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 564  * @adapter: pointer to adapter for which debug features should be unregistered
 565  */
 566 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
 567 {
 568         struct zfcp_dbf *dbf = adapter->dbf;
 569
 570         adapter->dbf = NULL;
 571         zfcp_dbf_unregister(dbf);
 572 }
 573