kernel/drivers/s390/scsi/zfcp_dbf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Debug traces for zfcp.
   5  *
   6  * Copyright IBM Corp. 2002, 2013
   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, 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, 1, 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         }
 245 }
 246
 247 /**
 248  * zfcp_dbf_rec_trig - trace event related to triggered recovery
 249  * @tag: identifier for event
 250  * @adapter: adapter on which the erp_action should run
 251  * @port: remote port involved in the erp_action
 252  * @sdev: scsi device involved in the erp_action
 253  * @want: wanted erp_action
 254  * @need: required erp_action
 255  *
 256  * The adapter->erp_lock has to be held.
 257  */
 258 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
 259                        struct zfcp_port *port, struct scsi_device *sdev,
 260                        u8 want, u8 need)
 261 {
 262         struct zfcp_dbf *dbf = adapter->dbf;
 263         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 264         struct list_head *entry;
 265         unsigned long flags;
 266
 267         spin_lock_irqsave(&dbf->rec_lock, flags);
 268         memset(rec, 0, sizeof(*rec));
 269
 270         rec->id = ZFCP_DBF_REC_TRIG;
 271         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 272         zfcp_dbf_set_common(rec, adapter, port, sdev);
 273
 274         list_for_each(entry, &adapter->erp_ready_head)
 275                 rec->u.trig.ready++;
 276
 277         list_for_each(entry, &adapter->erp_running_head)
 278                 rec->u.trig.running++;
 279
 280         rec->u.trig.want = want;
 281         rec->u.trig.need = need;
 282
 283         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 284         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 285 }
 286
 287
 288 /**
 289  * zfcp_dbf_rec_run - trace event related to running recovery
 290  * @tag: identifier for event
 291  * @erp: erp_action running
 292  */
 293 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
 294 {
 295         struct zfcp_dbf *dbf = erp->adapter->dbf;
 296         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 297         unsigned long flags;
 298
 299         spin_lock_irqsave(&dbf->rec_lock, flags);
 300         memset(rec, 0, sizeof(*rec));
 301
 302         rec->id = ZFCP_DBF_REC_RUN;
 303         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 304         zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
 305
 306         rec->u.run.fsf_req_id = erp->fsf_req_id;
 307         rec->u.run.rec_status = erp->status;
 308         rec->u.run.rec_step = erp->step;
 309         rec->u.run.rec_action = erp->action;
 310
 311         if (erp->sdev)
 312                 rec->u.run.rec_count =
 313                         atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
 314         else if (erp->port)
 315                 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
 316         else
 317                 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
 318
 319         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 320         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 321 }
 322
 323 static inline
 324 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
 325                   u64 req_id, u32 d_id)
 326 {
 327         struct zfcp_dbf_san *rec = &dbf->san_buf;
 328         u16 rec_len;
 329         unsigned long flags;
 330
 331         spin_lock_irqsave(&dbf->san_lock, flags);
 332         memset(rec, 0, sizeof(*rec));
 333
 334         rec->id = id;
 335         rec->fsf_req_id = req_id;
 336         rec->d_id = d_id;
 337         rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
 338         memcpy(rec->payload, data, rec_len);
 339         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 340
 341         debug_event(dbf->san, 1, rec, sizeof(*rec));
 342         spin_unlock_irqrestore(&dbf->san_lock, flags);
 343 }
 344
 345 /**
 346  * zfcp_dbf_san_req - trace event for issued SAN request
 347  * @tag: identifier for event
 348  * @fsf_req: request containing issued CT data
 349  * d_id: destination ID
 350  */
 351 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
 352 {
 353         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 354         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 355         u16 length;
 356
 357         length = (u16)(ct_els->req->length + FC_CT_HDR_LEN);
 358         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
 359                      fsf->req_id, d_id);
 360 }
 361
 362 /**
 363  * zfcp_dbf_san_res - trace event for received SAN request
 364  * @tag: identifier for event
 365  * @fsf_req: request containing issued CT data
 366  */
 367 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 368 {
 369         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 370         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 371         u16 length;
 372
 373         length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
 374         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
 375                      fsf->req_id, 0);
 376 }
 377
 378 /**
 379  * zfcp_dbf_san_in_els - trace event for incoming ELS
 380  * @tag: identifier for event
 381  * @fsf_req: request containing issued CT data
 382  */
 383 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 384 {
 385         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 386         struct fsf_status_read_buffer *srb =
 387                 (struct fsf_status_read_buffer *) fsf->data;
 388         u16 length;
 389
 390         length = (u16)(srb->length -
 391                         offsetof(struct fsf_status_read_buffer, payload));
 392         zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
 393                      fsf->req_id, ntoh24(srb->d_id));
 394 }
 395
 396 /**
 397  * zfcp_dbf_scsi - trace event for scsi commands
 398  * @tag: identifier for event
 399  * @sc: pointer to struct scsi_cmnd
 400  * @fsf: pointer to struct zfcp_fsf_req
 401  */
 402 void zfcp_dbf_scsi(char *tag, struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
 403 {
 404         struct zfcp_adapter *adapter =
 405                 (struct zfcp_adapter *) sc->device->host->hostdata[0];
 406         struct zfcp_dbf *dbf = adapter->dbf;
 407         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 408         struct fcp_resp_with_ext *fcp_rsp;
 409         struct fcp_resp_rsp_info *fcp_rsp_info;
 410         unsigned long flags;
 411
 412         spin_lock_irqsave(&dbf->scsi_lock, flags);
 413         memset(rec, 0, sizeof(*rec));
 414
 415         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 416         rec->id = ZFCP_DBF_SCSI_CMND;
 417         rec->scsi_result = sc->result;
 418         rec->scsi_retries = sc->retries;
 419         rec->scsi_allowed = sc->allowed;
 420         rec->scsi_id = sc->device->id;
 421         /* struct zfcp_dbf_scsi needs to be updated to handle 64bit LUNs */
 422         rec->scsi_lun = (u32)sc->device->lun;
 423         rec->host_scribble = (unsigned long)sc->host_scribble;
 424
 425         memcpy(rec->scsi_opcode, sc->cmnd,
 426                min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
 427
 428         if (fsf) {
 429                 rec->fsf_req_id = fsf->req_id;
 430                 fcp_rsp = (struct fcp_resp_with_ext *)
 431                                 &(fsf->qtcb->bottom.io.fcp_rsp);
 432                 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
 433                 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
 434                         fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 435                         rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
 436                 }
 437                 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
 438                         rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
 439                                           (u16)ZFCP_DBF_PAY_MAX_REC);
 440                         zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
 441                                           "fcp_sns", fsf->req_id);
 442                 }
 443         }
 444
 445         debug_event(dbf->scsi, 1, rec, sizeof(*rec));
 446         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 447 }
 448
 449 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
 450 {
 451         struct debug_info *d;
 452
 453         d = debug_register(name, size, 1, rec_size);
 454         if (!d)
 455                 return NULL;
 456
 457         debug_register_view(d, &debug_hex_ascii_view);
 458         debug_set_level(d, dbflevel);
 459
 460         return d;
 461 }
 462
 463 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
 464 {
 465         if (!dbf)
 466                 return;
 467
 468         debug_unregister(dbf->scsi);
 469         debug_unregister(dbf->san);
 470         debug_unregister(dbf->hba);
 471         debug_unregister(dbf->pay);
 472         debug_unregister(dbf->rec);
 473         kfree(dbf);
 474 }
 475
 476 /**
 477  * zfcp_adapter_debug_register - registers debug feature for an adapter
 478  * @adapter: pointer to adapter for which debug features should be registered
 479  * return: -ENOMEM on error, 0 otherwise
 480  */
 481 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
 482 {
 483         char name[DEBUG_MAX_NAME_LEN];
 484         struct zfcp_dbf *dbf;
 485
 486         dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
 487         if (!dbf)
 488                 return -ENOMEM;
 489
 490         spin_lock_init(&dbf->pay_lock);
 491         spin_lock_init(&dbf->hba_lock);
 492         spin_lock_init(&dbf->san_lock);
 493         spin_lock_init(&dbf->scsi_lock);
 494         spin_lock_init(&dbf->rec_lock);
 495
 496         /* debug feature area which records recovery activity */
 497         sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
 498         dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
 499         if (!dbf->rec)
 500                 goto err_out;
 501
 502         /* debug feature area which records HBA (FSF and QDIO) conditions */
 503         sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
 504         dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
 505         if (!dbf->hba)
 506                 goto err_out;
 507
 508         /* debug feature area which records payload info */
 509         sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
 510         dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
 511         if (!dbf->pay)
 512                 goto err_out;
 513
 514         /* debug feature area which records SAN command failures and recovery */
 515         sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
 516         dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
 517         if (!dbf->san)
 518                 goto err_out;
 519
 520         /* debug feature area which records SCSI command failures and recovery */
 521         sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
 522         dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
 523         if (!dbf->scsi)
 524                 goto err_out;
 525
 526         adapter->dbf = dbf;
 527
 528         return 0;
 529 err_out:
 530         zfcp_dbf_unregister(dbf);
 531         return -ENOMEM;
 532 }
 533
 534 /**
 535  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 536  * @adapter: pointer to adapter for which debug features should be unregistered
 537  */
 538 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
 539 {
 540         struct zfcp_dbf *dbf = adapter->dbf;
 541
 542         adapter->dbf = NULL;
 543         zfcp_dbf_unregister(dbf);
 544 }
 545