drivers/s390/scsi/zfcp_dbf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * zfcp device driver
   4  * debug feature declarations
   5  *
   6  * Copyright IBM Corp. 2008, 2017
   7  */
   8
   9 #ifndef ZFCP_DBF_H
  10 #define ZFCP_DBF_H
  11
  12 #include <scsi/fc/fc_fcp.h>
  13 #include "zfcp_ext.h"
  14 #include "zfcp_fsf.h"
  15 #include "zfcp_def.h"
  16
  17 #define ZFCP_DBF_TAG_LEN       7
  18
  19 #define ZFCP_DBF_INVALID_LUN    0xFFFFFFFFFFFFFFFFull
  20
  21 enum zfcp_dbf_pseudo_erp_act_type {
  22         ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD = 0xff,
  23         ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL = 0xfe,
  24 };
  25
  26 /**
  27  * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
  28  * @ready: number of ready recovery actions
  29  * @running: number of running recovery actions
  30  * @want: wanted recovery action
  31  * @need: needed recovery action
  32  */
  33 struct zfcp_dbf_rec_trigger {
  34         u32 ready;
  35         u32 running;
  36         u8 want;
  37         u8 need;
  38 } __packed;
  39
  40 /**
  41  * struct zfcp_dbf_rec_running - trace record for running recovery
  42  * @fsf_req_id: request id for fsf requests
  43  * @rec_status: status of the fsf request
  44  * @rec_step: current step of the recovery action
  45  * rec_count: recovery counter
  46  */
  47 struct zfcp_dbf_rec_running {
  48         u64 fsf_req_id;
  49         u32 rec_status;
  50         u16 rec_step;
  51         u8 rec_action;
  52         u8 rec_count;
  53 } __packed;
  54
  55 /**
  56  * enum zfcp_dbf_rec_id - recovery trace record id
  57  * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
  58  * @ZFCP_DBF_REC_RUN: running recovery identifier
  59  */
  60 enum zfcp_dbf_rec_id {
  61         ZFCP_DBF_REC_TRIG       = 1,
  62         ZFCP_DBF_REC_RUN        = 2,
  63 };
  64
  65 /**
  66  * struct zfcp_dbf_rec - trace record for error recovery actions
  67  * @id: unique number of recovery record type
  68  * @tag: identifier string specifying the location of initiation
  69  * @lun: logical unit number
  70  * @wwpn: word wide port number
  71  * @d_id: destination ID
  72  * @adapter_status: current status of the adapter
  73  * @port_status: current status of the port
  74  * @lun_status: current status of the lun
  75  * @u.trig: structure zfcp_dbf_rec_trigger
  76  * @u.run: structure zfcp_dbf_rec_running
  77  */
  78 struct zfcp_dbf_rec {
  79         u8 id;
  80         char tag[ZFCP_DBF_TAG_LEN];
  81         u64 lun;
  82         u64 wwpn;
  83         u32 d_id;
  84         u32 adapter_status;
  85         u32 port_status;
  86         u32 lun_status;
  87         union {
  88                 struct zfcp_dbf_rec_trigger trig;
  89                 struct zfcp_dbf_rec_running run;
  90         } u;
  91 } __packed;
  92
  93 /**
  94  * enum zfcp_dbf_san_id - SAN trace record identifier
  95  * @ZFCP_DBF_SAN_REQ: request trace record id
  96  * @ZFCP_DBF_SAN_RES: response trace record id
  97  * @ZFCP_DBF_SAN_ELS: extended link service record id
  98  */
  99 enum zfcp_dbf_san_id {
 100         ZFCP_DBF_SAN_REQ        = 1,
 101         ZFCP_DBF_SAN_RES        = 2,
 102         ZFCP_DBF_SAN_ELS        = 3,
 103 };
 104
 105 /** struct zfcp_dbf_san - trace record for SAN requests and responses
 106  * @id: unique number of recovery record type
 107  * @tag: identifier string specifying the location of initiation
 108  * @fsf_req_id: request id for fsf requests
 109  * @payload: unformatted information related to request/response
 110  * @d_id: destination id
 111  */
 112 struct zfcp_dbf_san {
 113         u8 id;
 114         char tag[ZFCP_DBF_TAG_LEN];
 115         u64 fsf_req_id;
 116         u32 d_id;
 117 #define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
 118         char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
 119         u16 pl_len;
 120 } __packed;
 121
 122 /**
 123  * struct zfcp_dbf_hba_res - trace record for hba responses
 124  * @req_issued: timestamp when request was issued
 125  * @prot_status: protocol status
 126  * @prot_status_qual: protocol status qualifier
 127  * @fsf_status: fsf status
 128  * @fsf_status_qual: fsf status qualifier
 129  */
 130 struct zfcp_dbf_hba_res {
 131         u64 req_issued;
 132         u32 prot_status;
 133         u8  prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
 134         u32 fsf_status;
 135         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 136         u32 port_handle;
 137         u32 lun_handle;
 138 } __packed;
 139
 140 /**
 141  * struct zfcp_dbf_hba_uss - trace record for unsolicited status
 142  * @status_type: type of unsolicited status
 143  * @status_subtype: subtype of unsolicited status
 144  * @d_id: destination ID
 145  * @lun: logical unit number
 146  * @queue_designator: queue designator
 147  */
 148 struct zfcp_dbf_hba_uss {
 149         u32 status_type;
 150         u32 status_subtype;
 151         u32 d_id;
 152         u64 lun;
 153         u64 queue_designator;
 154 } __packed;
 155
 156 /**
 157  * enum zfcp_dbf_hba_id - HBA trace record identifier
 158  * @ZFCP_DBF_HBA_RES: response trace record
 159  * @ZFCP_DBF_HBA_USS: unsolicited status trace record
 160  * @ZFCP_DBF_HBA_BIT: bit error trace record
 161  */
 162 enum zfcp_dbf_hba_id {
 163         ZFCP_DBF_HBA_RES        = 1,
 164         ZFCP_DBF_HBA_USS        = 2,
 165         ZFCP_DBF_HBA_BIT        = 3,
 166         ZFCP_DBF_HBA_BASIC      = 4,
 167 };
 168
 169 /**
 170  * struct zfcp_dbf_hba - common trace record for HBA records
 171  * @id: unique number of recovery record type
 172  * @tag: identifier string specifying the location of initiation
 173  * @fsf_req_id: request id for fsf requests
 174  * @fsf_req_status: status of fsf request
 175  * @fsf_cmd: fsf command
 176  * @fsf_seq_no: fsf sequence number
 177  * @pl_len: length of payload stored as zfcp_dbf_pay
 178  * @u: record type specific data
 179  */
 180 struct zfcp_dbf_hba {
 181         u8 id;
 182         char tag[ZFCP_DBF_TAG_LEN];
 183         u64 fsf_req_id;
 184         u32 fsf_req_status;
 185         u32 fsf_cmd;
 186         u32 fsf_seq_no;
 187         u16 pl_len;
 188         union {
 189                 struct zfcp_dbf_hba_res res;
 190                 struct zfcp_dbf_hba_uss uss;
 191                 struct fsf_bit_error_payload be;
 192         } u;
 193 } __packed;
 194
 195 /**
 196  * enum zfcp_dbf_scsi_id - scsi trace record identifier
 197  * @ZFCP_DBF_SCSI_CMND: scsi command trace record
 198  */
 199 enum zfcp_dbf_scsi_id {
 200         ZFCP_DBF_SCSI_CMND      = 1,
 201 };
 202
 203 /**
 204  * struct zfcp_dbf_scsi - common trace record for SCSI records
 205  * @id: unique number of recovery record type
 206  * @tag: identifier string specifying the location of initiation
 207  * @scsi_id: scsi device id
 208  * @scsi_lun: scsi device logical unit number, low part of 64 bit, old 32 bit
 209  * @scsi_result: scsi result
 210  * @scsi_retries: current retry number of scsi request
 211  * @scsi_allowed: allowed retries
 212  * @fcp_rsp_info: FCP response info code
 213  * @scsi_opcode: scsi opcode
 214  * @fsf_req_id: request id of fsf request
 215  * @host_scribble: LLD specific data attached to SCSI request
 216  * @pl_len: length of payload stored as zfcp_dbf_pay
 217  * @fcp_rsp: response for FCP request
 218  * @scsi_lun_64_hi: scsi device logical unit number, high part of 64 bit
 219  */
 220 struct zfcp_dbf_scsi {
 221         u8 id;
 222         char tag[ZFCP_DBF_TAG_LEN];
 223         u32 scsi_id;
 224         u32 scsi_lun;
 225         u32 scsi_result;
 226         u8 scsi_retries;
 227         u8 scsi_allowed;
 228         u8 fcp_rsp_info;
 229 #define ZFCP_DBF_SCSI_OPCODE    16
 230         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
 231         u64 fsf_req_id;
 232         u64 host_scribble;
 233         u16 pl_len;
 234         struct fcp_resp_with_ext fcp_rsp;
 235         u32 scsi_lun_64_hi;
 236 } __packed;
 237
 238 /**
 239  * struct zfcp_dbf_pay - trace record for unformatted payload information
 240  * @area: area this record is originated from
 241  * @counter: ascending record number
 242  * @fsf_req_id: request id of fsf request
 243  * @data: unformatted data
 244  */
 245 struct zfcp_dbf_pay {
 246         u8 counter;
 247         char area[ZFCP_DBF_TAG_LEN];
 248         u64 fsf_req_id;
 249 #define ZFCP_DBF_PAY_MAX_REC 0x100
 250         char data[ZFCP_DBF_PAY_MAX_REC];
 251 } __packed;
 252
 253 /**
 254  * struct zfcp_dbf - main dbf trace structure
 255  * @pay: reference to payload trace area
 256  * @rec: reference to recovery trace area
 257  * @hba: reference to hba trace area
 258  * @san: reference to san trace area
 259  * @scsi: reference to scsi trace area
 260  * @pay_lock: lock protecting payload trace buffer
 261  * @rec_lock: lock protecting recovery trace buffer
 262  * @hba_lock: lock protecting hba trace buffer
 263  * @san_lock: lock protecting san trace buffer
 264  * @scsi_lock: lock protecting scsi trace buffer
 265  * @pay_buf: pre-allocated buffer for payload
 266  * @rec_buf: pre-allocated buffer for recovery
 267  * @hba_buf: pre-allocated buffer for hba
 268  * @san_buf: pre-allocated buffer for san
 269  * @scsi_buf: pre-allocated buffer for scsi
 270  */
 271 struct zfcp_dbf {
 272         debug_info_t                    *pay;
 273         debug_info_t                    *rec;
 274         debug_info_t                    *hba;
 275         debug_info_t                    *san;
 276         debug_info_t                    *scsi;
 277         spinlock_t                      pay_lock;
 278         spinlock_t                      rec_lock;
 279         spinlock_t                      hba_lock;
 280         spinlock_t                      san_lock;
 281         spinlock_t                      scsi_lock;
 282         struct zfcp_dbf_pay             pay_buf;
 283         struct zfcp_dbf_rec             rec_buf;
 284         struct zfcp_dbf_hba             hba_buf;
 285         struct zfcp_dbf_san             san_buf;
 286         struct zfcp_dbf_scsi            scsi_buf;
 287 };
 288
 289 /**
 290  * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
 291  * @req: request that has been completed
 292  *
 293  * Returns true if FCP response with only benign residual under count.
 294  */
 295 static inline
 296 bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
 297 {
 298         struct fsf_qtcb *qtcb = req->qtcb;
 299         u32 fsf_stat = qtcb->header.fsf_status;
 300         struct fcp_resp *fcp_rsp;
 301         u8 rsp_flags, fr_status;
 302
 303         if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
 304                 return false; /* not an FCP response */
 305         fcp_rsp = &qtcb->bottom.io.fcp_rsp.iu.resp;
 306         rsp_flags = fcp_rsp->fr_flags;
 307         fr_status = fcp_rsp->fr_status;
 308         return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
 309                 (rsp_flags == FCP_RESID_UNDER) &&
 310                 (fr_status == SAM_STAT_GOOD);
 311 }
 312
 313 static inline
 314 void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
 315 {
 316         if (debug_level_enabled(req->adapter->dbf->hba, level))
 317                 zfcp_dbf_hba_fsf_res(tag, level, req);
 318 }
 319
 320 /**
 321  * zfcp_dbf_hba_fsf_response - trace event for request completion
 322  * @req: request that has been completed
 323  */
 324 static inline
 325 void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
 326 {
 327         struct fsf_qtcb *qtcb = req->qtcb;
 328
 329         if (unlikely(req->status & (ZFCP_STATUS_FSFREQ_DISMISSED |
 330                                     ZFCP_STATUS_FSFREQ_ERROR))) {
 331                 zfcp_dbf_hba_fsf_resp("fs_rerr", 3, req);
 332
 333         } else if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 334             (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 335                 zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);
 336
 337         } else if (qtcb->header.fsf_status != FSF_GOOD) {
 338                 zfcp_dbf_hba_fsf_resp("fs_ferr",
 339                                       zfcp_dbf_hba_fsf_resp_suppress(req)
 340                                       ? 5 : 1, req);
 341
 342         } else if ((req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
 343                    (req->fsf_command == FSF_QTCB_OPEN_LUN)) {
 344                 zfcp_dbf_hba_fsf_resp("fs_open", 4, req);
 345
 346         } else if (qtcb->header.log_length) {
 347                 zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);
 348
 349         } else {
 350                 zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
 351         }
 352 }
 353
 354 static inline
 355 void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
 356                    struct zfcp_fsf_req *req)
 357 {
 358         struct zfcp_adapter *adapter = (struct zfcp_adapter *)
 359                                         scmd->device->host->hostdata[0];
 360
 361         if (debug_level_enabled(adapter->dbf->scsi, level))
 362                 zfcp_dbf_scsi(tag, level, scmd, req);
 363 }
 364
 365 /**
 366  * zfcp_dbf_scsi_result - trace event for SCSI command completion
 367  * @scmd: SCSI command pointer
 368  * @req: FSF request used to issue SCSI command
 369  */
 370 static inline
 371 void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
 372 {
 373         if (scmd->result != 0)
 374                 _zfcp_dbf_scsi("rsl_err", 3, scmd, req);
 375         else if (scmd->retries > 0)
 376                 _zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
 377         else
 378                 _zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
 379 }
 380
 381 /**
 382  * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
 383  * @scmd: SCSI command pointer
 384  */
 385 static inline
 386 void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
 387 {
 388         _zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
 389 }
 390
 391 /**
 392  * zfcp_dbf_scsi_abort - trace event for SCSI command abort
 393  * @tag: tag indicating success or failure of abort operation
 394  * @scmd: SCSI command to be aborted
 395  * @fsf_req: request containing abort (might be NULL)
 396  */
 397 static inline
 398 void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
 399                          struct zfcp_fsf_req *fsf_req)
 400 {
 401         _zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
 402 }
 403
 404 /**
 405  * zfcp_dbf_scsi_devreset - trace event for Logical Unit or Target Reset
 406  * @tag: tag indicating success or failure of reset operation
 407  * @scmnd: SCSI command which caused this error recovery
 408  * @flag: indicates type of reset (Target Reset, Logical Unit Reset)
 409  */
 410 static inline
 411 void zfcp_dbf_scsi_devreset(char *tag, struct scsi_cmnd *scmnd, u8 flag,
 412                             struct zfcp_fsf_req *fsf_req)
 413 {
 414         char tmp_tag[ZFCP_DBF_TAG_LEN];
 415
 416         if (flag == FCP_TMF_TGT_RESET)
 417                 memcpy(tmp_tag, "tr_", 3);
 418         else
 419                 memcpy(tmp_tag, "lr_", 3);
 420
 421         memcpy(&tmp_tag[3], tag, 4);
 422         _zfcp_dbf_scsi(tmp_tag, 1, scmnd, fsf_req);
 423 }
 424
 425 /**
 426  * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
 427  * @scmnd: SCSI command that was NULLified.
 428  * @fsf_req: request that owned @scmnd.
 429  */
 430 static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
 431                                           struct zfcp_fsf_req *fsf_req)
 432 {
 433         _zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
 434 }
 435
 436 #endif /* ZFCP_DBF_H */