drivers/s390/scsi/zfcp_dbf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Debug traces for zfcp.
   5  *
   6  * Copyright IBM Corp. 2002, 2016
   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         rec->u.res.port_handle = q_head->port_handle;
  89         rec->u.res.lun_handle = q_head->lun_handle;
  90
  91         memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
  92                FSF_PROT_STATUS_QUAL_SIZE);
  93         memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
  94                FSF_STATUS_QUALIFIER_SIZE);
  95
  96         if (req->fsf_command != FSF_QTCB_FCP_CMND) {
  97                 rec->pl_len = q_head->log_length;
  98                 zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
  99                                   rec->pl_len, "fsf_res", req->req_id);
 100         }
 101
 102         debug_event(dbf->hba, level, rec, sizeof(*rec));
 103         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 104 }
 105
 106 /**
 107  * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
 108  * @tag: tag indicating which kind of unsolicited status has been received
 109  * @req: request providing the unsolicited status
 110  */
 111 void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 112 {
 113         struct zfcp_dbf *dbf = req->adapter->dbf;
 114         struct fsf_status_read_buffer *srb = req->data;
 115         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 116         unsigned long flags;
 117
 118         spin_lock_irqsave(&dbf->hba_lock, flags);
 119         memset(rec, 0, sizeof(*rec));
 120
 121         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 122         rec->id = ZFCP_DBF_HBA_USS;
 123         rec->fsf_req_id = req->req_id;
 124         rec->fsf_req_status = req->status;
 125         rec->fsf_cmd = req->fsf_command;
 126
 127         if (!srb)
 128                 goto log;
 129
 130         rec->u.uss.status_type = srb->status_type;
 131         rec->u.uss.status_subtype = srb->status_subtype;
 132         rec->u.uss.d_id = ntoh24(srb->d_id);
 133         rec->u.uss.lun = srb->fcp_lun;
 134         memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
 135                sizeof(rec->u.uss.queue_designator));
 136
 137         /* status read buffer payload length */
 138         rec->pl_len = (!srb->length) ? 0 : srb->length -
 139                         offsetof(struct fsf_status_read_buffer, payload);
 140
 141         if (rec->pl_len)
 142                 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
 143                                   "fsf_uss", req->req_id);
 144 log:
 145         debug_event(dbf->hba, 2, rec, sizeof(*rec));
 146         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 147 }
 148
 149 /**
 150  * zfcp_dbf_hba_bit_err - trace event for bit error conditions
 151  * @tag: tag indicating which kind of unsolicited status has been received
 152  * @req: request which caused the bit_error condition
 153  */
 154 void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
 155 {
 156         struct zfcp_dbf *dbf = req->adapter->dbf;
 157         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 158         struct fsf_status_read_buffer *sr_buf = req->data;
 159         unsigned long flags;
 160
 161         spin_lock_irqsave(&dbf->hba_lock, flags);
 162         memset(rec, 0, sizeof(*rec));
 163
 164         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 165         rec->id = ZFCP_DBF_HBA_BIT;
 166         rec->fsf_req_id = req->req_id;
 167         rec->fsf_req_status = req->status;
 168         rec->fsf_cmd = req->fsf_command;
 169         memcpy(&rec->u.be, &sr_buf->payload.bit_error,
 170                sizeof(struct fsf_bit_error_payload));
 171
 172         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 173         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 174 }
 175
 176 /**
 177  * zfcp_dbf_hba_def_err - trace event for deferred error messages
 178  * @adapter: pointer to struct zfcp_adapter
 179  * @req_id: request id which caused the deferred error message
 180  * @scount: number of sbals incl. the signaling sbal
 181  * @pl: array of all involved sbals
 182  */
 183 void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
 184                           void **pl)
 185 {
 186         struct zfcp_dbf *dbf = adapter->dbf;
 187         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 188         unsigned long flags;
 189         u16 length;
 190
 191         if (!pl)
 192                 return;
 193
 194         spin_lock_irqsave(&dbf->pay_lock, flags);
 195         memset(payload, 0, sizeof(*payload));
 196
 197         memcpy(payload->area, "def_err", 7);
 198         payload->fsf_req_id = req_id;
 199         payload->counter = 0;
 200         length = min((u16)sizeof(struct qdio_buffer),
 201                      (u16)ZFCP_DBF_PAY_MAX_REC);
 202
 203         while (payload->counter < scount && (char *)pl[payload->counter]) {
 204                 memcpy(payload->data, (char *)pl[payload->counter], length);
 205                 debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
 206                 payload->counter++;
 207         }
 208
 209         spin_unlock_irqrestore(&dbf->pay_lock, flags);
 210 }
 211
 212 /**
 213  * zfcp_dbf_hba_basic - trace event for basic adapter events
 214  * @adapter: pointer to struct zfcp_adapter
 215  */
 216 void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
 217 {
 218         struct zfcp_dbf *dbf = adapter->dbf;
 219         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 220         unsigned long flags;
 221
 222         spin_lock_irqsave(&dbf->hba_lock, flags);
 223         memset(rec, 0, sizeof(*rec));
 224
 225         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 226         rec->id = ZFCP_DBF_HBA_BASIC;
 227
 228         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 229         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 230 }
 231
 232 static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
 233                                 struct zfcp_adapter *adapter,
 234                                 struct zfcp_port *port,
 235                                 struct scsi_device *sdev)
 236 {
 237         rec->adapter_status = atomic_read(&adapter->status);
 238         if (port) {
 239                 rec->port_status = atomic_read(&port->status);
 240                 rec->wwpn = port->wwpn;
 241                 rec->d_id = port->d_id;
 242         }
 243         if (sdev) {
 244                 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
 245                 rec->lun = zfcp_scsi_dev_lun(sdev);
 246         } else
 247                 rec->lun = ZFCP_DBF_INVALID_LUN;
 248 }
 249
 250 /**
 251  * zfcp_dbf_rec_trig - trace event related to triggered recovery
 252  * @tag: identifier for event
 253  * @adapter: adapter on which the erp_action should run
 254  * @port: remote port involved in the erp_action
 255  * @sdev: scsi device involved in the erp_action
 256  * @want: wanted erp_action
 257  * @need: required erp_action
 258  *
 259  * The adapter->erp_lock has to be held.
 260  */
 261 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
 262                        struct zfcp_port *port, struct scsi_device *sdev,
 263                        u8 want, u8 need)
 264 {
 265         struct zfcp_dbf *dbf = adapter->dbf;
 266         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 267         struct list_head *entry;
 268         unsigned long flags;
 269
 270         spin_lock_irqsave(&dbf->rec_lock, flags);
 271         memset(rec, 0, sizeof(*rec));
 272
 273         rec->id = ZFCP_DBF_REC_TRIG;
 274         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 275         zfcp_dbf_set_common(rec, adapter, port, sdev);
 276
 277         list_for_each(entry, &adapter->erp_ready_head)
 278                 rec->u.trig.ready++;
 279
 280         list_for_each(entry, &adapter->erp_running_head)
 281                 rec->u.trig.running++;
 282
 283         rec->u.trig.want = want;
 284         rec->u.trig.need = need;
 285
 286         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 287         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 288 }
 289
 290
 291 /**
 292  * zfcp_dbf_rec_run - trace event related to running recovery
 293  * @tag: identifier for event
 294  * @erp: erp_action running
 295  */
 296 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
 297 {
 298         struct zfcp_dbf *dbf = erp->adapter->dbf;
 299         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&dbf->rec_lock, flags);
 303         memset(rec, 0, sizeof(*rec));
 304
 305         rec->id = ZFCP_DBF_REC_RUN;
 306         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 307         zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
 308
 309         rec->u.run.fsf_req_id = erp->fsf_req_id;
 310         rec->u.run.rec_status = erp->status;
 311         rec->u.run.rec_step = erp->step;
 312         rec->u.run.rec_action = erp->action;
 313
 314         if (erp->sdev)
 315                 rec->u.run.rec_count =
 316                         atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
 317         else if (erp->port)
 318                 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
 319         else
 320                 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
 321
 322         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 323         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 324 }
 325
 326 /**
 327  * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
 328  * @tag: identifier for event
 329  * @wka_port: well known address port
 330  * @req_id: request ID to correlate with potential HBA trace record
 331  */
 332 void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
 333                           u64 req_id)
 334 {
 335         struct zfcp_dbf *dbf = wka_port->adapter->dbf;
 336         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 337         unsigned long flags;
 338
 339         spin_lock_irqsave(&dbf->rec_lock, flags);
 340         memset(rec, 0, sizeof(*rec));
 341
 342         rec->id = ZFCP_DBF_REC_RUN;
 343         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 344         rec->port_status = wka_port->status;
 345         rec->d_id = wka_port->d_id;
 346         rec->lun = ZFCP_DBF_INVALID_LUN;
 347
 348         rec->u.run.fsf_req_id = req_id;
 349         rec->u.run.rec_status = ~0;
 350         rec->u.run.rec_step = ~0;
 351         rec->u.run.rec_action = ~0;
 352         rec->u.run.rec_count = ~0;
 353
 354         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 355         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 356 }
 357
 358 static inline
 359 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf,
 360                   char *paytag, struct scatterlist *sg, u8 id, u16 len,
 361                   u64 req_id, u32 d_id, u16 cap_len)
 362 {
 363         struct zfcp_dbf_san *rec = &dbf->san_buf;
 364         u16 rec_len;
 365         unsigned long flags;
 366         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 367         u16 pay_sum = 0;
 368
 369         spin_lock_irqsave(&dbf->san_lock, flags);
 370         memset(rec, 0, sizeof(*rec));
 371
 372         rec->id = id;
 373         rec->fsf_req_id = req_id;
 374         rec->d_id = d_id;
 375         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 376         rec->pl_len = len; /* full length even if we cap pay below */
 377         if (!sg)
 378                 goto out;
 379         rec_len = min_t(unsigned int, sg->length, ZFCP_DBF_SAN_MAX_PAYLOAD);
 380         memcpy(rec->payload, sg_virt(sg), rec_len); /* part of 1st sg entry */
 381         if (len <= rec_len)
 382                 goto out; /* skip pay record if full content in rec->payload */
 383
 384         /* if (len > rec_len):
 385          * dump data up to cap_len ignoring small duplicate in rec->payload
 386          */
 387         spin_lock_irqsave(&dbf->pay_lock, flags);
 388         memset(payload, 0, sizeof(*payload));
 389         memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN);
 390         payload->fsf_req_id = req_id;
 391         payload->counter = 0;
 392         for (; sg && pay_sum < cap_len; sg = sg_next(sg)) {
 393                 u16 pay_len, offset = 0;
 394
 395                 while (offset < sg->length && pay_sum < cap_len) {
 396                         pay_len = min((u16)ZFCP_DBF_PAY_MAX_REC,
 397                                       (u16)(sg->length - offset));
 398                         /* cap_len <= pay_sum < cap_len+ZFCP_DBF_PAY_MAX_REC */
 399                         memcpy(payload->data, sg_virt(sg) + offset, pay_len);
 400                         debug_event(dbf->pay, 1, payload,
 401                                     zfcp_dbf_plen(pay_len));
 402                         payload->counter++;
 403                         offset += pay_len;
 404                         pay_sum += pay_len;
 405                 }
 406         }
 407         spin_unlock(&dbf->pay_lock);
 408
 409 out:
 410         debug_event(dbf->san, 1, rec, sizeof(*rec));
 411         spin_unlock_irqrestore(&dbf->san_lock, flags);
 412 }
 413
 414 /**
 415  * zfcp_dbf_san_req - trace event for issued SAN request
 416  * @tag: identifier for event
 417  * @fsf_req: request containing issued CT data
 418  * d_id: destination ID
 419  */
 420 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
 421 {
 422         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 423         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 424         u16 length;
 425
 426         length = (u16)zfcp_qdio_real_bytes(ct_els->req);
 427         zfcp_dbf_san(tag, dbf, "san_req", ct_els->req, ZFCP_DBF_SAN_REQ,
 428                      length, fsf->req_id, d_id, length);
 429 }
 430
 431 static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag,
 432                                               struct zfcp_fsf_req *fsf,
 433                                               u16 len)
 434 {
 435         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 436         struct fc_ct_hdr *reqh = sg_virt(ct_els->req);
 437         struct fc_ns_gid_ft *reqn = (struct fc_ns_gid_ft *)(reqh + 1);
 438         struct scatterlist *resp_entry = ct_els->resp;
 439         struct fc_gpn_ft_resp *acc;
 440         int max_entries, x, last = 0;
 441
 442         if (!(memcmp(tag, "fsscth2", 7) == 0
 443               && ct_els->d_id == FC_FID_DIR_SERV
 444               && reqh->ct_rev == FC_CT_REV
 445               && reqh->ct_in_id[0] == 0
 446               && reqh->ct_in_id[1] == 0
 447               && reqh->ct_in_id[2] == 0
 448               && reqh->ct_fs_type == FC_FST_DIR
 449               && reqh->ct_fs_subtype == FC_NS_SUBTYPE
 450               && reqh->ct_options == 0
 451               && reqh->_ct_resvd1 == 0
 452               && reqh->ct_cmd == FC_NS_GPN_FT
 453               /* reqh->ct_mr_size can vary so do not match but read below */
 454               && reqh->_ct_resvd2 == 0
 455               && reqh->ct_reason == 0
 456               && reqh->ct_explan == 0
 457               && reqh->ct_vendor == 0
 458               && reqn->fn_resvd == 0
 459               && reqn->fn_domain_id_scope == 0
 460               && reqn->fn_area_id_scope == 0
 461               && reqn->fn_fc4_type == FC_TYPE_FCP))
 462                 return len; /* not GPN_FT response so do not cap */
 463
 464         acc = sg_virt(resp_entry);
 465         max_entries = (reqh->ct_mr_size * 4 / sizeof(struct fc_gpn_ft_resp))
 466                 + 1 /* zfcp_fc_scan_ports: bytes correct, entries off-by-one
 467                      * to account for header as 1st pseudo "entry" */;
 468
 469         /* the basic CT_IU preamble is the same size as one entry in the GPN_FT
 470          * response, allowing us to skip special handling for it - just skip it
 471          */
 472         for (x = 1; x < max_entries && !last; x++) {
 473                 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
 474                         acc++;
 475                 else
 476                         acc = sg_virt(++resp_entry);
 477
 478                 last = acc->fp_flags & FC_NS_FID_LAST;
 479         }
 480         len = min(len, (u16)(x * sizeof(struct fc_gpn_ft_resp)));
 481         return len; /* cap after last entry */
 482 }
 483
 484 /**
 485  * zfcp_dbf_san_res - trace event for received SAN request
 486  * @tag: identifier for event
 487  * @fsf_req: request containing issued CT data
 488  */
 489 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 490 {
 491         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 492         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 493         u16 length;
 494
 495         length = (u16)zfcp_qdio_real_bytes(ct_els->resp);
 496         zfcp_dbf_san(tag, dbf, "san_res", ct_els->resp, ZFCP_DBF_SAN_RES,
 497                      length, fsf->req_id, ct_els->d_id,
 498                      zfcp_dbf_san_res_cap_len_if_gpn_ft(tag, fsf, length));
 499 }
 500
 501 /**
 502  * zfcp_dbf_san_in_els - trace event for incoming ELS
 503  * @tag: identifier for event
 504  * @fsf_req: request containing issued CT data
 505  */
 506 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 507 {
 508         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 509         struct fsf_status_read_buffer *srb =
 510                 (struct fsf_status_read_buffer *) fsf->data;
 511         u16 length;
 512         struct scatterlist sg;
 513
 514         length = (u16)(srb->length -
 515                         offsetof(struct fsf_status_read_buffer, payload));
 516         sg_init_one(&sg, srb->payload.data, length);
 517         zfcp_dbf_san(tag, dbf, "san_els", &sg, ZFCP_DBF_SAN_ELS, length,
 518                      fsf->req_id, ntoh24(srb->d_id), length);
 519 }
 520
 521 /**
 522  * zfcp_dbf_scsi - trace event for scsi commands
 523  * @tag: identifier for event
 524  * @sc: pointer to struct scsi_cmnd
 525  * @fsf: pointer to struct zfcp_fsf_req
 526  */
 527 void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
 528                    struct zfcp_fsf_req *fsf)
 529 {
 530         struct zfcp_adapter *adapter =
 531                 (struct zfcp_adapter *) sc->device->host->hostdata[0];
 532         struct zfcp_dbf *dbf = adapter->dbf;
 533         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 534         struct fcp_resp_with_ext *fcp_rsp;
 535         struct fcp_resp_rsp_info *fcp_rsp_info;
 536         unsigned long flags;
 537
 538         spin_lock_irqsave(&dbf->scsi_lock, flags);
 539         memset(rec, 0, sizeof(*rec));
 540
 541         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 542         rec->id = ZFCP_DBF_SCSI_CMND;
 543         rec->scsi_result = sc->result;
 544         rec->scsi_retries = sc->retries;
 545         rec->scsi_allowed = sc->allowed;
 546         rec->scsi_id = sc->device->id;
 547         /* struct zfcp_dbf_scsi needs to be updated to handle 64bit LUNs */
 548         rec->scsi_lun = (u32)sc->device->lun;
 549         rec->host_scribble = (unsigned long)sc->host_scribble;
 550
 551         memcpy(rec->scsi_opcode, sc->cmnd,
 552                min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
 553
 554         if (fsf) {
 555                 rec->fsf_req_id = fsf->req_id;
 556                 fcp_rsp = (struct fcp_resp_with_ext *)
 557                                 &(fsf->qtcb->bottom.io.fcp_rsp);
 558                 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
 559                 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
 560                         fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 561                         rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
 562                 }
 563                 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
 564                         rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
 565                                           (u16)ZFCP_DBF_PAY_MAX_REC);
 566                         zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
 567                                           "fcp_sns", fsf->req_id);
 568                 }
 569         }
 570
 571         debug_event(dbf->scsi, level, rec, sizeof(*rec));
 572         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 573 }
 574
 575 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
 576 {
 577         struct debug_info *d;
 578
 579         d = debug_register(name, size, 1, rec_size);
 580         if (!d)
 581                 return NULL;
 582
 583         debug_register_view(d, &debug_hex_ascii_view);
 584         debug_set_level(d, dbflevel);
 585
 586         return d;
 587 }
 588
 589 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
 590 {
 591         if (!dbf)
 592                 return;
 593
 594         debug_unregister(dbf->scsi);
 595         debug_unregister(dbf->san);
 596         debug_unregister(dbf->hba);
 597         debug_unregister(dbf->pay);
 598         debug_unregister(dbf->rec);
 599         kfree(dbf);
 600 }
 601
 602 /**
 603  * zfcp_adapter_debug_register - registers debug feature for an adapter
 604  * @adapter: pointer to adapter for which debug features should be registered
 605  * return: -ENOMEM on error, 0 otherwise
 606  */
 607 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
 608 {
 609         char name[DEBUG_MAX_NAME_LEN];
 610         struct zfcp_dbf *dbf;
 611
 612         dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
 613         if (!dbf)
 614                 return -ENOMEM;
 615
 616         spin_lock_init(&dbf->pay_lock);
 617         spin_lock_init(&dbf->hba_lock);
 618         spin_lock_init(&dbf->san_lock);
 619         spin_lock_init(&dbf->scsi_lock);
 620         spin_lock_init(&dbf->rec_lock);
 621
 622         /* debug feature area which records recovery activity */
 623         sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
 624         dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
 625         if (!dbf->rec)
 626                 goto err_out;
 627
 628         /* debug feature area which records HBA (FSF and QDIO) conditions */
 629         sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
 630         dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
 631         if (!dbf->hba)
 632                 goto err_out;
 633
 634         /* debug feature area which records payload info */
 635         sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
 636         dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
 637         if (!dbf->pay)
 638                 goto err_out;
 639
 640         /* debug feature area which records SAN command failures and recovery */
 641         sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
 642         dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
 643         if (!dbf->san)
 644                 goto err_out;
 645
 646         /* debug feature area which records SCSI command failures and recovery */
 647         sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
 648         dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
 649         if (!dbf->scsi)
 650                 goto err_out;
 651
 652         adapter->dbf = dbf;
 653
 654         return 0;
 655 err_out:
 656         zfcp_dbf_unregister(dbf);
 657         return -ENOMEM;
 658 }
 659
 660 /**
 661  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 662  * @adapter: pointer to adapter for which debug features should be unregistered
 663  */
 664 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
 665 {
 666         struct zfcp_dbf *dbf = adapter->dbf;
 667
 668         adapter->dbf = NULL;
 669         zfcp_dbf_unregister(dbf);
 670 }
 671