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 u32 dbflevel = 3;
  27
  28 module_param(dbflevel, uint, 0400);
  29 MODULE_PARM_DESC(dbflevel,
  30                  "log level for each debug feature area "
  31                  "(default 3, range 0..6)");
  32
  33 static inline unsigned int zfcp_dbf_plen(unsigned int offset)
  34 {
  35         return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
  36 }
  37
  38 static inline
  39 void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
  40                        u64 req_id)
  41 {
  42         struct zfcp_dbf_pay *pl = &dbf->pay_buf;
  43         u16 offset = 0, rec_length;
  44
  45         spin_lock(&dbf->pay_lock);
  46         memset(pl, 0, sizeof(*pl));
  47         pl->fsf_req_id = req_id;
  48         memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
  49
  50         while (offset < length) {
  51                 rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
  52                                  (u16) (length - offset));
  53                 memcpy(pl->data, data + offset, rec_length);
  54                 debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
  55
  56                 offset += rec_length;
  57                 pl->counter++;
  58         }
  59
  60         spin_unlock(&dbf->pay_lock);
  61 }
  62
  63 /**
  64  * zfcp_dbf_hba_fsf_res - trace event for fsf responses
  65  * @tag: tag indicating which kind of unsolicited status has been received
  66  * @req: request for which a response was received
  67  */
  68 void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
  69 {
  70         struct zfcp_dbf *dbf = req->adapter->dbf;
  71         struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
  72         struct fsf_qtcb_header *q_head = &req->qtcb->header;
  73         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
  74         unsigned long flags;
  75
  76         spin_lock_irqsave(&dbf->hba_lock, flags);
  77         memset(rec, 0, sizeof(*rec));
  78
  79         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
  80         rec->id = ZFCP_DBF_HBA_RES;
  81         rec->fsf_req_id = req->req_id;
  82         rec->fsf_req_status = req->status;
  83         rec->fsf_cmd = req->fsf_command;
  84         rec->fsf_seq_no = req->seq_no;
  85         rec->u.res.req_issued = req->issued;
  86         rec->u.res.prot_status = q_pref->prot_status;
  87         rec->u.res.fsf_status = q_head->fsf_status;
  88
  89         memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
  90                FSF_PROT_STATUS_QUAL_SIZE);
  91         memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
  92                FSF_STATUS_QUALIFIER_SIZE);
  93
  94         if (req->fsf_command != FSF_QTCB_FCP_CMND) {
  95                 rec->pl_len = q_head->log_length;
  96                 zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
  97                                   rec->pl_len, "fsf_res", req->req_id);
  98         }
  99
 100         debug_event(dbf->hba, level, rec, sizeof(*rec));
 101         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 102 }
 103
 104 /**
 105  * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
 106  * @tag: tag indicating which kind of unsolicited status has been received
 107  * @req: request providing the unsolicited status
 108  */
 109 void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 110 {
 111         struct zfcp_dbf *dbf = req->adapter->dbf;
 112         struct fsf_status_read_buffer *srb = req->data;
 113         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 114         unsigned long flags;
 115
 116         spin_lock_irqsave(&dbf->hba_lock, flags);
 117         memset(rec, 0, sizeof(*rec));
 118
 119         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 120         rec->id = ZFCP_DBF_HBA_USS;
 121         rec->fsf_req_id = req->req_id;
 122         rec->fsf_req_status = req->status;
 123         rec->fsf_cmd = req->fsf_command;
 124
 125         if (!srb)
 126                 goto log;
 127
 128         rec->u.uss.status_type = srb->status_type;
 129         rec->u.uss.status_subtype = srb->status_subtype;
 130         rec->u.uss.d_id = ntoh24(srb->d_id);
 131         rec->u.uss.lun = srb->fcp_lun;
 132         memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
 133                sizeof(rec->u.uss.queue_designator));
 134
 135         /* status read buffer payload length */
 136         rec->pl_len = (!srb->length) ? 0 : srb->length -
 137                         offsetof(struct fsf_status_read_buffer, payload);
 138
 139         if (rec->pl_len)
 140                 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
 141                                   "fsf_uss", req->req_id);
 142 log:
 143         debug_event(dbf->hba, 2, rec, sizeof(*rec));
 144         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 145 }
 146
 147 /**
 148  * zfcp_dbf_hba_bit_err - trace event for bit error conditions
 149  * @tag: tag indicating which kind of unsolicited status has been received
 150  * @req: request which caused the bit_error condition
 151  */
 152 void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
 153 {
 154         struct zfcp_dbf *dbf = req->adapter->dbf;
 155         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 156         struct fsf_status_read_buffer *sr_buf = req->data;
 157         unsigned long flags;
 158
 159         spin_lock_irqsave(&dbf->hba_lock, flags);
 160         memset(rec, 0, sizeof(*rec));
 161
 162         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 163         rec->id = ZFCP_DBF_HBA_BIT;
 164         rec->fsf_req_id = req->req_id;
 165         rec->fsf_req_status = req->status;
 166         rec->fsf_cmd = req->fsf_command;
 167         memcpy(&rec->u.be, &sr_buf->payload.bit_error,
 168                sizeof(struct fsf_bit_error_payload));
 169
 170         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 171         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 172 }
 173
 174 /**
 175  * zfcp_dbf_hba_def_err - trace event for deferred error messages
 176  * @adapter: pointer to struct zfcp_adapter
 177  * @req_id: request id which caused the deferred error message
 178  * @scount: number of sbals incl. the signaling sbal
 179  * @pl: array of all involved sbals
 180  */
 181 void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
 182                           void **pl)
 183 {
 184         struct zfcp_dbf *dbf = adapter->dbf;
 185         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 186         unsigned long flags;
 187         u16 length;
 188
 189         if (!pl)
 190                 return;
 191
 192         spin_lock_irqsave(&dbf->pay_lock, flags);
 193         memset(payload, 0, sizeof(*payload));
 194
 195         memcpy(payload->area, "def_err", 7);
 196         payload->fsf_req_id = req_id;
 197         payload->counter = 0;
 198         length = min((u16)sizeof(struct qdio_buffer),
 199                      (u16)ZFCP_DBF_PAY_MAX_REC);
 200
 201         while (payload->counter < scount && (char *)pl[payload->counter]) {
 202                 memcpy(payload->data, (char *)pl[payload->counter], length);
 203                 debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
 204                 payload->counter++;
 205         }
 206
 207         spin_unlock_irqrestore(&dbf->pay_lock, flags);
 208 }
 209
 210 /**
 211  * zfcp_dbf_hba_basic - trace event for basic adapter events
 212  * @adapter: pointer to struct zfcp_adapter
 213  */
 214 void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
 215 {
 216         struct zfcp_dbf *dbf = adapter->dbf;
 217         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 218         unsigned long flags;
 219
 220         spin_lock_irqsave(&dbf->hba_lock, flags);
 221         memset(rec, 0, sizeof(*rec));
 222
 223         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 224         rec->id = ZFCP_DBF_HBA_BASIC;
 225
 226         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 227         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 228 }
 229
 230 static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
 231                                 struct zfcp_adapter *adapter,
 232                                 struct zfcp_port *port,
 233                                 struct scsi_device *sdev)
 234 {
 235         rec->adapter_status = atomic_read(&adapter->status);
 236         if (port) {
 237                 rec->port_status = atomic_read(&port->status);
 238                 rec->wwpn = port->wwpn;
 239                 rec->d_id = port->d_id;
 240         }
 241         if (sdev) {
 242                 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
 243                 rec->lun = zfcp_scsi_dev_lun(sdev);
 244         } else
 245                 rec->lun = ZFCP_DBF_INVALID_LUN;
 246 }
 247
 248 /**
 249  * zfcp_dbf_rec_trig - trace event related to triggered recovery
 250  * @tag: identifier for event
 251  * @adapter: adapter on which the erp_action should run
 252  * @port: remote port involved in the erp_action
 253  * @sdev: scsi device involved in the erp_action
 254  * @want: wanted erp_action
 255  * @need: required erp_action
 256  *
 257  * The adapter->erp_lock has to be held.
 258  */
 259 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
 260                        struct zfcp_port *port, struct scsi_device *sdev,
 261                        u8 want, u8 need)
 262 {
 263         struct zfcp_dbf *dbf = adapter->dbf;
 264         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 265         struct list_head *entry;
 266         unsigned long flags;
 267
 268         spin_lock_irqsave(&dbf->rec_lock, flags);
 269         memset(rec, 0, sizeof(*rec));
 270
 271         rec->id = ZFCP_DBF_REC_TRIG;
 272         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 273         zfcp_dbf_set_common(rec, adapter, port, sdev);
 274
 275         list_for_each(entry, &adapter->erp_ready_head)
 276                 rec->u.trig.ready++;
 277
 278         list_for_each(entry, &adapter->erp_running_head)
 279                 rec->u.trig.running++;
 280
 281         rec->u.trig.want = want;
 282         rec->u.trig.need = need;
 283
 284         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 285         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 286 }
 287
 288
 289 /**
 290  * zfcp_dbf_rec_run - trace event related to running recovery
 291  * @tag: identifier for event
 292  * @erp: erp_action running
 293  */
 294 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
 295 {
 296         struct zfcp_dbf *dbf = erp->adapter->dbf;
 297         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 298         unsigned long flags;
 299
 300         spin_lock_irqsave(&dbf->rec_lock, flags);
 301         memset(rec, 0, sizeof(*rec));
 302
 303         rec->id = ZFCP_DBF_REC_RUN;
 304         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 305         zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
 306
 307         rec->u.run.fsf_req_id = erp->fsf_req_id;
 308         rec->u.run.rec_status = erp->status;
 309         rec->u.run.rec_step = erp->step;
 310         rec->u.run.rec_action = erp->action;
 311
 312         if (erp->sdev)
 313                 rec->u.run.rec_count =
 314                         atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
 315         else if (erp->port)
 316                 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
 317         else
 318                 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
 319
 320         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 321         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 322 }
 323
 324 /**
 325  * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
 326  * @tag: identifier for event
 327  * @wka_port: well known address port
 328  * @req_id: request ID to correlate with potential HBA trace record
 329  */
 330 void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
 331                           u64 req_id)
 332 {
 333         struct zfcp_dbf *dbf = wka_port->adapter->dbf;
 334         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 335         unsigned long flags;
 336
 337         spin_lock_irqsave(&dbf->rec_lock, flags);
 338         memset(rec, 0, sizeof(*rec));
 339
 340         rec->id = ZFCP_DBF_REC_RUN;
 341         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 342         rec->port_status = wka_port->status;
 343         rec->d_id = wka_port->d_id;
 344         rec->lun = ZFCP_DBF_INVALID_LUN;
 345
 346         rec->u.run.fsf_req_id = req_id;
 347         rec->u.run.rec_status = ~0;
 348         rec->u.run.rec_step = ~0;
 349         rec->u.run.rec_action = ~0;
 350         rec->u.run.rec_count = ~0;
 351
 352         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 353         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 354 }
 355
 356 static inline
 357 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
 358                   u64 req_id, u32 d_id)
 359 {
 360         struct zfcp_dbf_san *rec = &dbf->san_buf;
 361         u16 rec_len;
 362         unsigned long flags;
 363
 364         spin_lock_irqsave(&dbf->san_lock, flags);
 365         memset(rec, 0, sizeof(*rec));
 366
 367         rec->id = id;
 368         rec->fsf_req_id = req_id;
 369         rec->d_id = d_id;
 370         rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
 371         memcpy(rec->payload, data, rec_len);
 372         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 373
 374         debug_event(dbf->san, 1, rec, sizeof(*rec));
 375         spin_unlock_irqrestore(&dbf->san_lock, flags);
 376 }
 377
 378 /**
 379  * zfcp_dbf_san_req - trace event for issued SAN request
 380  * @tag: identifier for event
 381  * @fsf_req: request containing issued CT data
 382  * d_id: destination ID
 383  */
 384 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
 385 {
 386         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 387         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 388         u16 length;
 389
 390         length = (u16)(ct_els->req->length + FC_CT_HDR_LEN);
 391         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
 392                      fsf->req_id, d_id);
 393 }
 394
 395 /**
 396  * zfcp_dbf_san_res - trace event for received SAN request
 397  * @tag: identifier for event
 398  * @fsf_req: request containing issued CT data
 399  */
 400 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 401 {
 402         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 403         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 404         u16 length;
 405
 406         length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
 407         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
 408                      fsf->req_id, 0);
 409 }
 410
 411 /**
 412  * zfcp_dbf_san_in_els - trace event for incoming ELS
 413  * @tag: identifier for event
 414  * @fsf_req: request containing issued CT data
 415  */
 416 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 417 {
 418         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 419         struct fsf_status_read_buffer *srb =
 420                 (struct fsf_status_read_buffer *) fsf->data;
 421         u16 length;
 422
 423         length = (u16)(srb->length -
 424                         offsetof(struct fsf_status_read_buffer, payload));
 425         zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
 426                      fsf->req_id, ntoh24(srb->d_id));
 427 }
 428
 429 /**
 430  * zfcp_dbf_scsi - trace event for scsi commands
 431  * @tag: identifier for event
 432  * @sc: pointer to struct scsi_cmnd
 433  * @fsf: pointer to struct zfcp_fsf_req
 434  */
 435 void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
 436                    struct zfcp_fsf_req *fsf)
 437 {
 438         struct zfcp_adapter *adapter =
 439                 (struct zfcp_adapter *) sc->device->host->hostdata[0];
 440         struct zfcp_dbf *dbf = adapter->dbf;
 441         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 442         struct fcp_resp_with_ext *fcp_rsp;
 443         struct fcp_resp_rsp_info *fcp_rsp_info;
 444         unsigned long flags;
 445
 446         spin_lock_irqsave(&dbf->scsi_lock, flags);
 447         memset(rec, 0, sizeof(*rec));
 448
 449         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 450         rec->id = ZFCP_DBF_SCSI_CMND;
 451         rec->scsi_result = sc->result;
 452         rec->scsi_retries = sc->retries;
 453         rec->scsi_allowed = sc->allowed;
 454         rec->scsi_id = sc->device->id;
 455         /* struct zfcp_dbf_scsi needs to be updated to handle 64bit LUNs */
 456         rec->scsi_lun = (u32)sc->device->lun;
 457         rec->host_scribble = (unsigned long)sc->host_scribble;
 458
 459         memcpy(rec->scsi_opcode, sc->cmnd,
 460                min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
 461
 462         if (fsf) {
 463                 rec->fsf_req_id = fsf->req_id;
 464                 fcp_rsp = (struct fcp_resp_with_ext *)
 465                                 &(fsf->qtcb->bottom.io.fcp_rsp);
 466                 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
 467                 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
 468                         fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 469                         rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
 470                 }
 471                 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
 472                         rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
 473                                           (u16)ZFCP_DBF_PAY_MAX_REC);
 474                         zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
 475                                           "fcp_sns", fsf->req_id);
 476                 }
 477         }
 478
 479         debug_event(dbf->scsi, level, rec, sizeof(*rec));
 480         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 481 }
 482
 483 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
 484 {
 485         struct debug_info *d;
 486
 487         d = debug_register(name, size, 1, rec_size);
 488         if (!d)
 489                 return NULL;
 490
 491         debug_register_view(d, &debug_hex_ascii_view);
 492         debug_set_level(d, dbflevel);
 493
 494         return d;
 495 }
 496
 497 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
 498 {
 499         if (!dbf)
 500                 return;
 501
 502         debug_unregister(dbf->scsi);
 503         debug_unregister(dbf->san);
 504         debug_unregister(dbf->hba);
 505         debug_unregister(dbf->pay);
 506         debug_unregister(dbf->rec);
 507         kfree(dbf);
 508 }
 509
 510 /**
 511  * zfcp_adapter_debug_register - registers debug feature for an adapter
 512  * @adapter: pointer to adapter for which debug features should be registered
 513  * return: -ENOMEM on error, 0 otherwise
 514  */
 515 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
 516 {
 517         char name[DEBUG_MAX_NAME_LEN];
 518         struct zfcp_dbf *dbf;
 519
 520         dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
 521         if (!dbf)
 522                 return -ENOMEM;
 523
 524         spin_lock_init(&dbf->pay_lock);
 525         spin_lock_init(&dbf->hba_lock);
 526         spin_lock_init(&dbf->san_lock);
 527         spin_lock_init(&dbf->scsi_lock);
 528         spin_lock_init(&dbf->rec_lock);
 529
 530         /* debug feature area which records recovery activity */
 531         sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
 532         dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
 533         if (!dbf->rec)
 534                 goto err_out;
 535
 536         /* debug feature area which records HBA (FSF and QDIO) conditions */
 537         sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
 538         dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
 539         if (!dbf->hba)
 540                 goto err_out;
 541
 542         /* debug feature area which records payload info */
 543         sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
 544         dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
 545         if (!dbf->pay)
 546                 goto err_out;
 547
 548         /* debug feature area which records SAN command failures and recovery */
 549         sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
 550         dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
 551         if (!dbf->san)
 552                 goto err_out;
 553
 554         /* debug feature area which records SCSI command failures and recovery */
 555         sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
 556         dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
 557         if (!dbf->scsi)
 558                 goto err_out;
 559
 560         adapter->dbf = dbf;
 561
 562         return 0;
 563 err_out:
 564         zfcp_dbf_unregister(dbf);
 565         return -ENOMEM;
 566 }
 567
 568 /**
 569  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 570  * @adapter: pointer to adapter for which debug features should be unregistered
 571  */
 572 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
 573 {
 574         struct zfcp_dbf *dbf = adapter->dbf;
 575
 576         adapter->dbf = NULL;
 577         zfcp_dbf_unregister(dbf);
 578 }
 579