drivers/s390/scsi/zfcp_dbf.h

   1 /*
   2  * zfcp device driver
   3  * debug feature declarations
   4  *
   5  * Copyright IBM Corp. 2008, 2016
   6  */
   7
   8 #ifndef ZFCP_DBF_H
   9 #define ZFCP_DBF_H
  10
  11 #include <scsi/fc/fc_fcp.h>
  12 #include "zfcp_ext.h"
  13 #include "zfcp_fsf.h"
  14 #include "zfcp_def.h"
  15
  16 #define ZFCP_DBF_TAG_LEN       7
  17
  18 #define ZFCP_DBF_INVALID_LUN    0xFFFFFFFFFFFFFFFFull
  19
  20 enum zfcp_dbf_pseudo_erp_act_type {
  21         ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff,
  22         ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe,
  23 };
  24
  25 /**
  26  * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
  27  * @ready: number of ready recovery actions
  28  * @running: number of running recovery actions
  29  * @want: wanted recovery action
  30  * @need: needed recovery action
  31  */
  32 struct zfcp_dbf_rec_trigger {
  33         u32 ready;
  34         u32 running;
  35         u8 want;
  36         u8 need;
  37 } __packed;
  38
  39 /**
  40  * struct zfcp_dbf_rec_running - trace record for running recovery
  41  * @fsf_req_id: request id for fsf requests
  42  * @rec_status: status of the fsf request
  43  * @rec_step: current step of the recovery action
  44  * rec_count: recovery counter
  45  */
  46 struct zfcp_dbf_rec_running {
  47         u64 fsf_req_id;
  48         u32 rec_status;
  49         u16 rec_step;
  50         u8 rec_action;
  51         u8 rec_count;
  52 } __packed;
  53
  54 /**
  55  * enum zfcp_dbf_rec_id - recovery trace record id
  56  * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
  57  * @ZFCP_DBF_REC_RUN: running recovery identifier
  58  */
  59 enum zfcp_dbf_rec_id {
  60         ZFCP_DBF_REC_TRIG       = 1,
  61         ZFCP_DBF_REC_RUN        = 2,
  62 };
  63
  64 /**
  65  * struct zfcp_dbf_rec - trace record for error recovery actions
  66  * @id: unique number of recovery record type
  67  * @tag: identifier string specifying the location of initiation
  68  * @lun: logical unit number
  69  * @wwpn: word wide port number
  70  * @d_id: destination ID
  71  * @adapter_status: current status of the adapter
  72  * @port_status: current status of the port
  73  * @lun_status: current status of the lun
  74  * @u.trig: structure zfcp_dbf_rec_trigger
  75  * @u.run: structure zfcp_dbf_rec_running
  76  */
  77 struct zfcp_dbf_rec {
  78         u8 id;
  79         char tag[ZFCP_DBF_TAG_LEN];
  80         u64 lun;
  81         u64 wwpn;
  82         u32 d_id;
  83         u32 adapter_status;
  84         u32 port_status;
  85         u32 lun_status;
  86         union {
  87                 struct zfcp_dbf_rec_trigger trig;
  88                 struct zfcp_dbf_rec_running run;
  89         } u;
  90 } __packed;
  91
  92 /**
  93  * enum zfcp_dbf_san_id - SAN trace record identifier
  94  * @ZFCP_DBF_SAN_REQ: request trace record id
  95  * @ZFCP_DBF_SAN_RES: response trace record id
  96  * @ZFCP_DBF_SAN_ELS: extended link service record id
  97  */
  98 enum zfcp_dbf_san_id {
  99         ZFCP_DBF_SAN_REQ        = 1,
 100         ZFCP_DBF_SAN_RES        = 2,
 101         ZFCP_DBF_SAN_ELS        = 3,
 102 };
 103
 104 /** struct zfcp_dbf_san - trace record for SAN requests and responses
 105  * @id: unique number of recovery record type
 106  * @tag: identifier string specifying the location of initiation
 107  * @fsf_req_id: request id for fsf requests
 108  * @payload: unformatted information related to request/response
 109  * @d_id: destination id
 110  */
 111 struct zfcp_dbf_san {
 112         u8 id;
 113         char tag[ZFCP_DBF_TAG_LEN];
 114         u64 fsf_req_id;
 115         u32 d_id;
 116 #define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
 117         char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
 118         u16 pl_len;
 119 } __packed;
 120
 121 /**
 122  * struct zfcp_dbf_hba_res - trace record for hba responses
 123  * @req_issued: timestamp when request was issued
 124  * @prot_status: protocol status
 125  * @prot_status_qual: protocol status qualifier
 126  * @fsf_status: fsf status
 127  * @fsf_status_qual: fsf status qualifier
 128  */
 129 struct zfcp_dbf_hba_res {
 130         u64 req_issued;
 131         u32 prot_status;
 132         u8  prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
 133         u32 fsf_status;
 134         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 135         u32 port_handle;
 136         u32 lun_handle;
 137 } __packed;
 138
 139 /**
 140  * struct zfcp_dbf_hba_uss - trace record for unsolicited status
 141  * @status_type: type of unsolicited status
 142  * @status_subtype: subtype of unsolicited status
 143  * @d_id: destination ID
 144  * @lun: logical unit number
 145  * @queue_designator: queue designator
 146  */
 147 struct zfcp_dbf_hba_uss {
 148         u32 status_type;
 149         u32 status_subtype;
 150         u32 d_id;
 151         u64 lun;
 152         u64 queue_designator;
 153 } __packed;
 154
 155 /**
 156  * enum zfcp_dbf_hba_id - HBA trace record identifier
 157  * @ZFCP_DBF_HBA_RES: response trace record
 158  * @ZFCP_DBF_HBA_USS: unsolicited status trace record
 159  * @ZFCP_DBF_HBA_BIT: bit error trace record
 160  */
 161 enum zfcp_dbf_hba_id {
 162         ZFCP_DBF_HBA_RES        = 1,
 163         ZFCP_DBF_HBA_USS        = 2,
 164         ZFCP_DBF_HBA_BIT        = 3,
 165         ZFCP_DBF_HBA_BASIC      = 4,
 166 };
 167
 168 /**
 169  * struct zfcp_dbf_hba - common trace record for HBA records
 170  * @id: unique number of recovery record type
 171  * @tag: identifier string specifying the location of initiation
 172  * @fsf_req_id: request id for fsf requests
 173  * @fsf_req_status: status of fsf request
 174  * @fsf_cmd: fsf command
 175  * @fsf_seq_no: fsf sequence number
 176  * @pl_len: length of payload stored as zfcp_dbf_pay
 177  * @u: record type specific data
 178  */
 179 struct zfcp_dbf_hba {
 180         u8 id;
 181         char tag[ZFCP_DBF_TAG_LEN];
 182         u64 fsf_req_id;
 183         u32 fsf_req_status;
 184         u32 fsf_cmd;
 185         u32 fsf_seq_no;
 186         u16 pl_len;
 187         union {
 188                 struct zfcp_dbf_hba_res res;
 189                 struct zfcp_dbf_hba_uss uss;
 190                 struct fsf_bit_error_payload be;
 191         } u;
 192 } __packed;
 193
 194 /**
 195  * enum zfcp_dbf_scsi_id - scsi trace record identifier
 196  * @ZFCP_DBF_SCSI_CMND: scsi command trace record
 197  */
 198 enum zfcp_dbf_scsi_id {
 199         ZFCP_DBF_SCSI_CMND      = 1,
 200 };
 201
 202 /**
 203  * struct zfcp_dbf_scsi - common trace record for SCSI records
 204  * @id: unique number of recovery record type
 205  * @tag: identifier string specifying the location of initiation
 206  * @scsi_id: scsi device id
 207  * @scsi_lun: scsi device logical unit number
 208  * @scsi_result: scsi result
 209  * @scsi_retries: current retry number of scsi request
 210  * @scsi_allowed: allowed retries
 211  * @fcp_rsp_info: FCP response info
 212  * @scsi_opcode: scsi opcode
 213  * @fsf_req_id: request id of fsf request
 214  * @host_scribble: LLD specific data attached to SCSI request
 215  * @pl_len: length of paload stored as zfcp_dbf_pay
 216  * @fsf_rsp: response for fsf request
 217  */
 218 struct zfcp_dbf_scsi {
 219         u8 id;
 220         char tag[ZFCP_DBF_TAG_LEN];
 221         u32 scsi_id;
 222         u32 scsi_lun;
 223         u32 scsi_result;
 224         u8 scsi_retries;
 225         u8 scsi_allowed;
 226         u8 fcp_rsp_info;
 227 #define ZFCP_DBF_SCSI_OPCODE    16
 228         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
 229         u64 fsf_req_id;
 230         u64 host_scribble;
 231         u16 pl_len;
 232         struct fcp_resp_with_ext fcp_rsp;
 233 } __packed;
 234
 235 /**
 236  * struct zfcp_dbf_pay - trace record for unformatted payload information
 237  * @area: area this record is originated from
 238  * @counter: ascending record number
 239  * @fsf_req_id: request id of fsf request
 240  * @data: unformatted data
 241  */
 242 struct zfcp_dbf_pay {
 243         u8 counter;
 244         char area[ZFCP_DBF_TAG_LEN];
 245         u64 fsf_req_id;
 246 #define ZFCP_DBF_PAY_MAX_REC 0x100
 247         char data[ZFCP_DBF_PAY_MAX_REC];
 248 } __packed;
 249
 250 /**
 251  * struct zfcp_dbf - main dbf trace structure
 252  * @pay: reference to payload trace area
 253  * @rec: reference to recovery trace area
 254  * @hba: reference to hba trace area
 255  * @san: reference to san trace area
 256  * @scsi: reference to scsi trace area
 257  * @pay_lock: lock protecting payload trace buffer
 258  * @rec_lock: lock protecting recovery trace buffer
 259  * @hba_lock: lock protecting hba trace buffer
 260  * @san_lock: lock protecting san trace buffer
 261  * @scsi_lock: lock protecting scsi trace buffer
 262  * @pay_buf: pre-allocated buffer for payload
 263  * @rec_buf: pre-allocated buffer for recovery
 264  * @hba_buf: pre-allocated buffer for hba
 265  * @san_buf: pre-allocated buffer for san
 266  * @scsi_buf: pre-allocated buffer for scsi
 267  */
 268 struct zfcp_dbf {
 269         debug_info_t                    *pay;
 270         debug_info_t                    *rec;
 271         debug_info_t                    *hba;
 272         debug_info_t                    *san;
 273         debug_info_t                    *scsi;
 274         spinlock_t                      pay_lock;
 275         spinlock_t                      rec_lock;
 276         spinlock_t                      hba_lock;
 277         spinlock_t                      san_lock;
 278         spinlock_t                      scsi_lock;
 279         struct zfcp_dbf_pay             pay_buf;
 280         struct zfcp_dbf_rec             rec_buf;
 281         struct zfcp_dbf_hba             hba_buf;
 282         struct zfcp_dbf_san             san_buf;
 283         struct zfcp_dbf_scsi            scsi_buf;
 284 };
 285
 286 /**
 287  * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
 288  * @req: request that has been completed
 289  *
 290  * Returns true if FCP response with only benign residual under count.
 291  */
 292 static inline
 293 bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
 294 {
 295         struct fsf_qtcb *qtcb = req->qtcb;
 296         u32 fsf_stat = qtcb->header.fsf_status;
 297         struct fcp_resp *fcp_rsp;
 298         u8 rsp_flags, fr_status;
 299
 300         if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
 301                 return false; /* not an FCP response */
 302         fcp_rsp = (struct fcp_resp *)&qtcb->bottom.io.fcp_rsp;
 303         rsp_flags = fcp_rsp->fr_flags;
 304         fr_status = fcp_rsp->fr_status;
 305         return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
 306                 (rsp_flags == FCP_RESID_UNDER) &&
 307                 (fr_status == SAM_STAT_GOOD);
 308 }
 309
 310 static inline
 311 void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
 312 {
 313         if (level <= req->adapter->dbf->hba->level)
 314                 zfcp_dbf_hba_fsf_res(tag, level, req);
 315 }
 316
 317 /**
 318  * zfcp_dbf_hba_fsf_response - trace event for request completion
 319  * @req: request that has been completed
 320  */
 321 static inline
 322 void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
 323 {
 324         struct fsf_qtcb *qtcb = req->qtcb;
 325
 326         if (unlikely(req->status & (ZFCP_STATUS_FSFREQ_DISMISSED |
 327                                     ZFCP_STATUS_FSFREQ_ERROR))) {
 328                 zfcp_dbf_hba_fsf_resp("fs_rerr", 3, req);
 329
 330         } else if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 331             (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 332                 zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);
 333
 334         } else if (qtcb->header.fsf_status != FSF_GOOD) {
 335                 zfcp_dbf_hba_fsf_resp("fs_ferr",
 336                                       zfcp_dbf_hba_fsf_resp_suppress(req)
 337                                       ? 5 : 1, req);
 338
 339         } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
 340                    (req->fsf_command == FSF_QTCB_OPEN_LUN)) {
 341                 zfcp_dbf_hba_fsf_resp("fs_open", 4, req);
 342
 343         } else if (qtcb->header.log_length) {
 344                 zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);
 345
 346         } else {
 347                 zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
 348         }
 349 }
 350
 351 static inline
 352 void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
 353                    struct zfcp_fsf_req *req)
 354 {
 355         struct zfcp_adapter *adapter = (struct zfcp_adapter *)
 356                                         scmd->device->host->hostdata[0];
 357
 358         if (level <= adapter->dbf->scsi->level)
 359                 zfcp_dbf_scsi(tag, level, scmd, req);
 360 }
 361
 362 /**
 363  * zfcp_dbf_scsi_result - trace event for SCSI command completion
 364  * @scmd: SCSI command pointer
 365  * @req: FSF request used to issue SCSI command
 366  */
 367 static inline
 368 void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
 369 {
 370         if (scmd->result != 0)
 371                 _zfcp_dbf_scsi("rsl_err", 3, scmd, req);
 372         else if (scmd->retries > 0)
 373                 _zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
 374         else
 375                 _zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
 376 }
 377
 378 /**
 379  * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
 380  * @scmd: SCSI command pointer
 381  */
 382 static inline
 383 void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
 384 {
 385         _zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
 386 }
 387
 388 /**
 389  * zfcp_dbf_scsi_abort - trace event for SCSI command abort
 390  * @tag: tag indicating success or failure of abort operation
 391  * @scmd: SCSI command to be aborted
 392  * @fsf_req: request containing abort (might be NULL)
 393  */
 394 static inline
 395 void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
 396                          struct zfcp_fsf_req *fsf_req)
 397 {
 398         _zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
 399 }
 400
 401 /**
 402  * zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
 403  * @tag: tag indicating success or failure of reset operation
 404  * @scmnd: SCSI command which caused this error recovery
 405  * @flag: indicates type of reset (Target Reset, Logical Unit Reset)
 406  */
 407 static inline
 408 void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag)
 409 {
 410         char tmp_tag[ZFCP_DBF_TAG_LEN];
 411
 412         if (flag == FCP_TMF_TGT_RESET)
 413                 memcpy(tmp_tag, "tr_", 3);
 414         else
 415                 memcpy(tmp_tag, "lr_", 3);
 416
 417         memcpy(&tmp_tag[3], tag, 4);
 418         _zfcp_dbf_scsi(tmp_tag, 1, scmnd, NULL);
 419 }
 420
 421 /**
 422  * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
 423  * @scmnd: SCSI command that was NULLified.
 424  * @fsf_req: request that owned @scmnd.
 425  */
 426 static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
 427                                           struct zfcp_fsf_req *fsf_req)
 428 {
 429         _zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
 430 }
 431
 432 #endif /* ZFCP_DBF_H */