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_action: ERP action type
  46  * @rec_count: recoveries including retries for particular @rec_action
  47  */
  48 struct zfcp_dbf_rec_running {
  49         u64 fsf_req_id;
  50         u32 rec_status;
  51         u16 rec_step;
  52         u8 rec_action;
  53         u8 rec_count;
  54 } __packed;
  55
  56 /**
  57  * enum zfcp_dbf_rec_id - recovery trace record id
  58  * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
  59  * @ZFCP_DBF_REC_RUN: running recovery identifier
  60  */
  61 enum zfcp_dbf_rec_id {
  62         ZFCP_DBF_REC_TRIG       = 1,
  63         ZFCP_DBF_REC_RUN        = 2,
  64 };
  65
  66 /**
  67  * struct zfcp_dbf_rec - trace record for error recovery actions
  68  * @id: unique number of recovery record type
  69  * @tag: identifier string specifying the location of initiation
  70  * @lun: logical unit number
  71  * @wwpn: word wide port number
  72  * @d_id: destination ID
  73  * @adapter_status: current status of the adapter
  74  * @port_status: current status of the port
  75  * @lun_status: current status of the lun
  76  * @u: record type specific data
  77  * @u.trig: structure zfcp_dbf_rec_trigger
  78  * @u.run: structure zfcp_dbf_rec_running
  79  */
  80 struct zfcp_dbf_rec {
  81         u8 id;
  82         char tag[ZFCP_DBF_TAG_LEN];
  83         u64 lun;
  84         u64 wwpn;
  85         u32 d_id;
  86         u32 adapter_status;
  87         u32 port_status;
  88         u32 lun_status;
  89         union {
  90                 struct zfcp_dbf_rec_trigger trig;
  91                 struct zfcp_dbf_rec_running run;
  92         } u;
  93 } __packed;
  94
  95 /**
  96  * enum zfcp_dbf_san_id - SAN trace record identifier
  97  * @ZFCP_DBF_SAN_REQ: request trace record id
  98  * @ZFCP_DBF_SAN_RES: response trace record id
  99  * @ZFCP_DBF_SAN_ELS: extended link service record id
 100  */
 101 enum zfcp_dbf_san_id {
 102         ZFCP_DBF_SAN_REQ        = 1,
 103         ZFCP_DBF_SAN_RES        = 2,
 104         ZFCP_DBF_SAN_ELS        = 3,
 105 };
 106
 107 /** struct zfcp_dbf_san - trace record for SAN requests and responses
 108  * @id: unique number of recovery record type
 109  * @tag: identifier string specifying the location of initiation
 110  * @fsf_req_id: request id for fsf requests
 111  * @payload: unformatted information related to request/response
 112  * @d_id: destination id
 113  */
 114 struct zfcp_dbf_san {
 115         u8 id;
 116         char tag[ZFCP_DBF_TAG_LEN];
 117         u64 fsf_req_id;
 118         u32 d_id;
 119 #define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
 120         char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
 121         u16 pl_len;
 122 } __packed;
 123
 124 /**
 125  * struct zfcp_dbf_hba_res - trace record for hba responses
 126  * @req_issued: timestamp when request was issued
 127  * @prot_status: protocol status
 128  * @prot_status_qual: protocol status qualifier
 129  * @fsf_status: fsf status
 130  * @fsf_status_qual: fsf status qualifier
 131  * @port_handle: handle for port
 132  * @lun_handle: handle for LUN
 133  */
 134 struct zfcp_dbf_hba_res {
 135         u64 req_issued;
 136         u32 prot_status;
 137         u8  prot_status_qual[FSF_PROT_STATUS_QUAL_SIZE];
 138         u32 fsf_status;
 139         u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 140         u32 port_handle;
 141         u32 lun_handle;
 142 } __packed;
 143
 144 /**
 145  * struct zfcp_dbf_hba_uss - trace record for unsolicited status
 146  * @status_type: type of unsolicited status
 147  * @status_subtype: subtype of unsolicited status
 148  * @d_id: destination ID
 149  * @lun: logical unit number
 150  * @queue_designator: queue designator
 151  */
 152 struct zfcp_dbf_hba_uss {
 153         u32 status_type;
 154         u32 status_subtype;
 155         u32 d_id;
 156         u64 lun;
 157         u64 queue_designator;
 158 } __packed;
 159
 160 /**
 161  * enum zfcp_dbf_hba_id - HBA trace record identifier
 162  * @ZFCP_DBF_HBA_RES: response trace record
 163  * @ZFCP_DBF_HBA_USS: unsolicited status trace record
 164  * @ZFCP_DBF_HBA_BIT: bit error trace record
 165  * @ZFCP_DBF_HBA_BASIC: basic adapter event, only trace tag, no other data
 166  */
 167 enum zfcp_dbf_hba_id {
 168         ZFCP_DBF_HBA_RES        = 1,
 169         ZFCP_DBF_HBA_USS        = 2,
 170         ZFCP_DBF_HBA_BIT        = 3,
 171         ZFCP_DBF_HBA_BASIC      = 4,
 172 };
 173
 174 /**
 175  * struct zfcp_dbf_hba - common trace record for HBA records
 176  * @id: unique number of recovery record type
 177  * @tag: identifier string specifying the location of initiation
 178  * @fsf_req_id: request id for fsf requests
 179  * @fsf_req_status: status of fsf request
 180  * @fsf_cmd: fsf command
 181  * @fsf_seq_no: fsf sequence number
 182  * @pl_len: length of payload stored as zfcp_dbf_pay
 183  * @u: record type specific data
 184  * @u.res: data for fsf responses
 185  * @u.uss: data for unsolicited status buffer
 186  * @u.be:  data for bit error unsolicited status buffer
 187  */
 188 struct zfcp_dbf_hba {
 189         u8 id;
 190         char tag[ZFCP_DBF_TAG_LEN];
 191         u64 fsf_req_id;
 192         u32 fsf_req_status;
 193         u32 fsf_cmd;
 194         u32 fsf_seq_no;
 195         u16 pl_len;
 196         union {
 197                 struct zfcp_dbf_hba_res res;
 198                 struct zfcp_dbf_hba_uss uss;
 199                 struct fsf_bit_error_payload be;
 200         } u;
 201 } __packed;
 202
 203 /**
 204  * enum zfcp_dbf_scsi_id - scsi trace record identifier
 205  * @ZFCP_DBF_SCSI_CMND: scsi command trace record
 206  */
 207 enum zfcp_dbf_scsi_id {
 208         ZFCP_DBF_SCSI_CMND      = 1,
 209 };
 210
 211 /**
 212  * struct zfcp_dbf_scsi - common trace record for SCSI records
 213  * @id: unique number of recovery record type
 214  * @tag: identifier string specifying the location of initiation
 215  * @scsi_id: scsi device id
 216  * @scsi_lun: scsi device logical unit number, low part of 64 bit, old 32 bit
 217  * @scsi_result: scsi result
 218  * @scsi_retries: current retry number of scsi request
 219  * @scsi_allowed: allowed retries
 220  * @fcp_rsp_info: FCP response info code
 221  * @scsi_opcode: scsi opcode
 222  * @fsf_req_id: request id of fsf request
 223  * @host_scribble: LLD specific data attached to SCSI request
 224  * @pl_len: length of payload stored as zfcp_dbf_pay
 225  * @fcp_rsp: response for FCP request
 226  * @scsi_lun_64_hi: scsi device logical unit number, high part of 64 bit
 227  */
 228 struct zfcp_dbf_scsi {
 229         u8 id;
 230         char tag[ZFCP_DBF_TAG_LEN];
 231         u32 scsi_id;
 232         u32 scsi_lun;
 233         u32 scsi_result;
 234         u8 scsi_retries;
 235         u8 scsi_allowed;
 236         u8 fcp_rsp_info;
 237 #define ZFCP_DBF_SCSI_OPCODE    16
 238         u8 scsi_opcode[ZFCP_DBF_SCSI_OPCODE];
 239         u64 fsf_req_id;
 240         u64 host_scribble;
 241         u16 pl_len;
 242         struct fcp_resp_with_ext fcp_rsp;
 243         u32 scsi_lun_64_hi;
 244 } __packed;
 245
 246 /**
 247  * struct zfcp_dbf_pay - trace record for unformatted payload information
 248  * @area: area this record is originated from
 249  * @counter: ascending record number
 250  * @fsf_req_id: request id of fsf request
 251  * @data: unformatted data
 252  */
 253 struct zfcp_dbf_pay {
 254         u8 counter;
 255         char area[ZFCP_DBF_TAG_LEN];
 256         u64 fsf_req_id;
 257 #define ZFCP_DBF_PAY_MAX_REC 0x100
 258         char data[ZFCP_DBF_PAY_MAX_REC];
 259 } __packed;
 260
 261 /**
 262  * struct zfcp_dbf - main dbf trace structure
 263  * @pay: reference to payload trace area
 264  * @rec: reference to recovery trace area
 265  * @hba: reference to hba trace area
 266  * @san: reference to san trace area
 267  * @scsi: reference to scsi trace area
 268  * @pay_lock: lock protecting payload trace buffer
 269  * @rec_lock: lock protecting recovery trace buffer
 270  * @hba_lock: lock protecting hba trace buffer
 271  * @san_lock: lock protecting san trace buffer
 272  * @scsi_lock: lock protecting scsi trace buffer
 273  * @pay_buf: pre-allocated buffer for payload
 274  * @rec_buf: pre-allocated buffer for recovery
 275  * @hba_buf: pre-allocated buffer for hba
 276  * @san_buf: pre-allocated buffer for san
 277  * @scsi_buf: pre-allocated buffer for scsi
 278  */
 279 struct zfcp_dbf {
 280         debug_info_t                    *pay;
 281         debug_info_t                    *rec;
 282         debug_info_t                    *hba;
 283         debug_info_t                    *san;
 284         debug_info_t                    *scsi;
 285         spinlock_t                      pay_lock;
 286         spinlock_t                      rec_lock;
 287         spinlock_t                      hba_lock;
 288         spinlock_t                      san_lock;
 289         spinlock_t                      scsi_lock;
 290         struct zfcp_dbf_pay             pay_buf;
 291         struct zfcp_dbf_rec             rec_buf;
 292         struct zfcp_dbf_hba             hba_buf;
 293         struct zfcp_dbf_san             san_buf;
 294         struct zfcp_dbf_scsi            scsi_buf;
 295 };
 296
 297 /**
 298  * zfcp_dbf_hba_fsf_resp_suppress - true if we should not trace by default
 299  * @req: request that has been completed
 300  *
 301  * Returns true if FCP response with only benign residual under count.
 302  */
 303 static inline
 304 bool zfcp_dbf_hba_fsf_resp_suppress(struct zfcp_fsf_req *req)
 305 {
 306         struct fsf_qtcb *qtcb = req->qtcb;
 307         u32 fsf_stat = qtcb->header.fsf_status;
 308         struct fcp_resp *fcp_rsp;
 309         u8 rsp_flags, fr_status;
 310
 311         if (qtcb->prefix.qtcb_type != FSF_IO_COMMAND)
 312                 return false; /* not an FCP response */
 313         fcp_rsp = &qtcb->bottom.io.fcp_rsp.iu.resp;
 314         rsp_flags = fcp_rsp->fr_flags;
 315         fr_status = fcp_rsp->fr_status;
 316         return (fsf_stat == FSF_FCP_RSP_AVAILABLE) &&
 317                 (rsp_flags == FCP_RESID_UNDER) &&
 318                 (fr_status == SAM_STAT_GOOD);
 319 }
 320
 321 static inline
 322 void zfcp_dbf_hba_fsf_resp(char *tag, int level, struct zfcp_fsf_req *req)
 323 {
 324         if (debug_level_enabled(req->adapter->dbf->hba, level))
 325                 zfcp_dbf_hba_fsf_res(tag, level, req);
 326 }
 327
 328 /**
 329  * zfcp_dbf_hba_fsf_response - trace event for request completion
 330  * @req: request that has been completed
 331  */
 332 static inline
 333 void zfcp_dbf_hba_fsf_response(struct zfcp_fsf_req *req)
 334 {
 335         struct fsf_qtcb *qtcb = req->qtcb;
 336
 337         if (unlikely(req->status & (ZFCP_STATUS_FSFREQ_DISMISSED |
 338                                     ZFCP_STATUS_FSFREQ_ERROR))) {
 339                 zfcp_dbf_hba_fsf_resp("fs_rerr", 3, req);
 340
 341         } else if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
 342             (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
 343                 zfcp_dbf_hba_fsf_resp("fs_perr", 1, req);
 344
 345         } else if (qtcb->header.fsf_status != FSF_GOOD) {
 346                 zfcp_dbf_hba_fsf_resp("fs_ferr",
 347                                       zfcp_dbf_hba_fsf_resp_suppress(req)
 348                                       ? 5 : 1, req);
 349
 350         } else if ((qtcb->header.fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
 351                    (qtcb->header.fsf_command == FSF_QTCB_OPEN_LUN)) {
 352                 zfcp_dbf_hba_fsf_resp("fs_open", 4, req);
 353
 354         } else if (qtcb->header.log_length) {
 355                 zfcp_dbf_hba_fsf_resp("fs_qtcb", 5, req);
 356
 357         } else {
 358                 zfcp_dbf_hba_fsf_resp("fs_norm", 6, req);
 359         }
 360 }
 361
 362 static inline
 363 void _zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *scmd,
 364                    struct zfcp_fsf_req *req)
 365 {
 366         struct zfcp_adapter *adapter = (struct zfcp_adapter *)
 367                                         scmd->device->host->hostdata[0];
 368
 369         if (debug_level_enabled(adapter->dbf->scsi, level))
 370                 zfcp_dbf_scsi_common(tag, level, scmd->device, scmd, req);
 371 }
 372
 373 /**
 374  * zfcp_dbf_scsi_result - trace event for SCSI command completion
 375  * @scmd: SCSI command pointer
 376  * @req: FSF request used to issue SCSI command
 377  */
 378 static inline
 379 void zfcp_dbf_scsi_result(struct scsi_cmnd *scmd, struct zfcp_fsf_req *req)
 380 {
 381         if (scmd->result != 0)
 382                 _zfcp_dbf_scsi("rsl_err", 3, scmd, req);
 383         else if (scmd->retries > 0)
 384                 _zfcp_dbf_scsi("rsl_ret", 4, scmd, req);
 385         else
 386                 _zfcp_dbf_scsi("rsl_nor", 6, scmd, req);
 387 }
 388
 389 /**
 390  * zfcp_dbf_scsi_fail_send - trace event for failure to send SCSI command
 391  * @scmd: SCSI command pointer
 392  */
 393 static inline
 394 void zfcp_dbf_scsi_fail_send(struct scsi_cmnd *scmd)
 395 {
 396         _zfcp_dbf_scsi("rsl_fai", 4, scmd, NULL);
 397 }
 398
 399 /**
 400  * zfcp_dbf_scsi_abort - trace event for SCSI command abort
 401  * @tag: tag indicating success or failure of abort operation
 402  * @scmd: SCSI command to be aborted
 403  * @fsf_req: request containing abort (might be NULL)
 404  */
 405 static inline
 406 void zfcp_dbf_scsi_abort(char *tag, struct scsi_cmnd *scmd,
 407                          struct zfcp_fsf_req *fsf_req)
 408 {
 409         _zfcp_dbf_scsi(tag, 1, scmd, fsf_req);
 410 }
 411
 412 /**
 413  * zfcp_dbf_scsi_devreset() - Trace event for Logical Unit or Target Reset.
 414  * @tag: Tag indicating success or failure of reset operation.
 415  * @sdev: Pointer to SCSI device as context for this event.
 416  * @flag: Indicates type of reset (Target Reset, Logical Unit Reset).
 417  * @fsf_req: Pointer to FSF request representing the TMF, or NULL.
 418  */
 419 static inline
 420 void zfcp_dbf_scsi_devreset(char *tag, struct scsi_device *sdev, u8 flag,
 421                             struct zfcp_fsf_req *fsf_req)
 422 {
 423         struct zfcp_adapter *adapter = (struct zfcp_adapter *)
 424                                         sdev->host->hostdata[0];
 425         char tmp_tag[ZFCP_DBF_TAG_LEN];
 426         static int const level = 1;
 427
 428         if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level)))
 429                 return;
 430
 431         if (flag == FCP_TMF_TGT_RESET)
 432                 memcpy(tmp_tag, "tr_", 3);
 433         else
 434                 memcpy(tmp_tag, "lr_", 3);
 435
 436         memcpy(&tmp_tag[3], tag, 4);
 437         zfcp_dbf_scsi_common(tmp_tag, level, sdev, NULL, fsf_req);
 438 }
 439
 440 /**
 441  * zfcp_dbf_scsi_nullcmnd() - trace NULLify of SCSI command in dev/tgt-reset.
 442  * @scmnd: SCSI command that was NULLified.
 443  * @fsf_req: request that owned @scmnd.
 444  */
 445 static inline void zfcp_dbf_scsi_nullcmnd(struct scsi_cmnd *scmnd,
 446                                           struct zfcp_fsf_req *fsf_req)
 447 {
 448         _zfcp_dbf_scsi("scfc__1", 3, scmnd, fsf_req);
 449 }
 450
 451 #endif /* ZFCP_DBF_H */