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