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zfcp_dbf.c
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linux-6.19.14/drivers/s390/scsi/zfcp_dbf.c
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * zfcp device driver 4 * 5 * Debug traces for zfcp. 6 * 7 * Copyright IBM Corp. 2002, 2023 8 */ 9 10#define pr_fmt(fmt) "zfcp: " 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 20static u32 dbfsize = 4; 21 22module_param(dbfsize, uint, 0400); 23MODULE_PARM_DESC(dbfsize, 24 "number of pages for each debug feature area (default 4)"); 25 26static u32 dbflevel = 3; 27 28module_param(dbflevel, uint, 0400); 29MODULE_PARM_DESC(dbflevel, 30 "log level for each debug feature area " 31 "(default 3, range 0..6)"); 32 33static 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 38static inline 39void 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 FSF response has been received 66 * @level: trace level to be used for event 67 * @req: request for which a response was received 68 */ 69void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req) 70{ 71 struct zfcp_dbf *dbf = req->adapter->dbf; 72 struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix; 73 struct fsf_qtcb_header *q_head = &req->qtcb->header; 74 struct zfcp_dbf_hba *rec = &dbf->hba_buf; 75 unsigned long flags; 76 77 spin_lock_irqsave(&dbf->hba_lock, flags); 78 memset(rec, 0, sizeof(*rec)); 79 80 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 81 rec->id = ZFCP_DBF_HBA_RES; 82 rec->fsf_req_id = req->req_id; 83 rec->fsf_req_status = req->status; 84 rec->fsf_cmd = q_head->fsf_command; 85 rec->fsf_seq_no = q_pref->req_seq_no; 86 rec->u.res.req_issued = req->issued; 87 rec->u.res.prot_status = q_pref->prot_status; 88 rec->u.res.fsf_status = q_head->fsf_status; 89 rec->u.res.port_handle = q_head->port_handle; 90 rec->u.res.lun_handle = q_head->lun_handle; 91 92 memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual, 93 FSF_PROT_STATUS_QUAL_SIZE); 94 memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual, 95 FSF_STATUS_QUALIFIER_SIZE); 96 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 debug_event(dbf->hba, level, rec, sizeof(*rec)); 102 spin_unlock_irqrestore(&dbf->hba_lock, flags); 103} 104 105/** 106 * zfcp_dbf_hba_fsf_fces - trace event for fsf responses related to 107 * FC Endpoint Security (FCES) 108 * @tag: tag indicating which kind of FC Endpoint Security event has occurred 109 * @req: request for which a response was received 110 * @wwpn: remote port or ZFCP_DBF_INVALID_WWPN 111 * @fc_security_old: old FC Endpoint Security of FCP device or connection 112 * @fc_security_new: new FC Endpoint Security of FCP device or connection 113 */ 114void zfcp_dbf_hba_fsf_fces(char *tag, const struct zfcp_fsf_req *req, u64 wwpn, 115 u32 fc_security_old, u32 fc_security_new) 116{ 117 struct zfcp_dbf *dbf = req->adapter->dbf; 118 struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix; 119 struct fsf_qtcb_header *q_head = &req->qtcb->header; 120 struct zfcp_dbf_hba *rec = &dbf->hba_buf; 121 static int const level = 3; 122 unsigned long flags; 123 124 if (unlikely(!debug_level_enabled(dbf->hba, level))) 125 return; 126 127 spin_lock_irqsave(&dbf->hba_lock, flags); 128 memset(rec, 0, sizeof(*rec)); 129 130 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 131 rec->id = ZFCP_DBF_HBA_FCES; 132 rec->fsf_req_id = req->req_id; 133 rec->fsf_req_status = req->status; 134 rec->fsf_cmd = q_head->fsf_command; 135 rec->fsf_seq_no = q_pref->req_seq_no; 136 rec->u.fces.req_issued = req->issued; 137 rec->u.fces.fsf_status = q_head->fsf_status; 138 rec->u.fces.port_handle = q_head->port_handle; 139 rec->u.fces.wwpn = wwpn; 140 rec->u.fces.fc_security_old = fc_security_old; 141 rec->u.fces.fc_security_new = fc_security_new; 142 143 debug_event(dbf->hba, level, rec, sizeof(*rec)); 144 spin_unlock_irqrestore(&dbf->hba_lock, flags); 145} 146 147/** 148 * zfcp_dbf_hba_fsf_reqid - trace only the tag and a request ID 149 * @tag: tag documenting the source 150 * @level: trace level 151 * @adapter: adapter instance the request ID belongs to 152 * @req_id: the request ID to trace 153 */ 154void zfcp_dbf_hba_fsf_reqid(const char *const tag, const int level, 155 struct zfcp_adapter *const adapter, 156 const u64 req_id) 157{ 158 struct zfcp_dbf *const dbf = adapter->dbf; 159 struct zfcp_dbf_hba *const rec = &dbf->hba_buf; 160 struct zfcp_dbf_hba_res *const res = &rec->u.res; 161 unsigned long flags; 162 163 if (unlikely(!debug_level_enabled(dbf->hba, level))) 164 return; 165 166 spin_lock_irqsave(&dbf->hba_lock, flags); 167 memset(rec, 0, sizeof(*rec)); 168 169 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 170 171 rec->id = ZFCP_DBF_HBA_RES; 172 rec->fsf_req_id = req_id; 173 rec->fsf_req_status = ~0u; 174 rec->fsf_cmd = ~0u; 175 rec->fsf_seq_no = ~0u; 176 177 res->req_issued = ~0ull; 178 res->prot_status = ~0u; 179 memset(res->prot_status_qual, 0xff, sizeof(res->prot_status_qual)); 180 res->fsf_status = ~0u; 181 memset(res->fsf_status_qual, 0xff, sizeof(res->fsf_status_qual)); 182 res->port_handle = ~0u; 183 res->lun_handle = ~0u; 184 185 debug_event(dbf->hba, level, rec, sizeof(*rec)); 186 spin_unlock_irqrestore(&dbf->hba_lock, flags); 187} 188 189/** 190 * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer 191 * @tag: tag indicating which kind of unsolicited status has been received 192 * @req: request providing the unsolicited status 193 */ 194void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req) 195{ 196 struct zfcp_dbf *dbf = req->adapter->dbf; 197 struct fsf_status_read_buffer *srb = req->data; 198 struct zfcp_dbf_hba *rec = &dbf->hba_buf; 199 static int const level = 2; 200 unsigned long flags; 201 202 if (unlikely(!debug_level_enabled(dbf->hba, level))) 203 return; 204 205 spin_lock_irqsave(&dbf->hba_lock, flags); 206 memset(rec, 0, sizeof(*rec)); 207 208 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 209 rec->id = ZFCP_DBF_HBA_USS; 210 rec->fsf_req_id = req->req_id; 211 rec->fsf_req_status = req->status; 212 rec->fsf_cmd = FSF_QTCB_UNSOLICITED_STATUS; 213 214 if (!srb) 215 goto log; 216 217 rec->u.uss.status_type = srb->status_type; 218 rec->u.uss.status_subtype = srb->status_subtype; 219 rec->u.uss.d_id = ntoh24(srb->d_id); 220 rec->u.uss.lun = srb->fcp_lun; 221 memcpy(&rec->u.uss.queue_designator, &srb->queue_designator, 222 sizeof(rec->u.uss.queue_designator)); 223 224 /* status read buffer payload length */ 225 rec->pl_len = (!srb->length) ? 0 : srb->length - 226 offsetof(struct fsf_status_read_buffer, payload); 227 228 if (rec->pl_len) 229 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len, 230 "fsf_uss", req->req_id); 231log: 232 debug_event(dbf->hba, level, rec, sizeof(*rec)); 233 spin_unlock_irqrestore(&dbf->hba_lock, flags); 234} 235 236/** 237 * zfcp_dbf_hba_bit_err - trace event for bit error conditions 238 * @tag: tag indicating which kind of bit error unsolicited status was received 239 * @req: request which caused the bit_error condition 240 */ 241void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req) 242{ 243 struct zfcp_dbf *dbf = req->adapter->dbf; 244 struct zfcp_dbf_hba *rec = &dbf->hba_buf; 245 struct fsf_status_read_buffer *sr_buf = req->data; 246 static int const level = 1; 247 unsigned long flags; 248 249 if (unlikely(!debug_level_enabled(dbf->hba, level))) 250 return; 251 252 spin_lock_irqsave(&dbf->hba_lock, flags); 253 memset(rec, 0, sizeof(*rec)); 254 255 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 256 rec->id = ZFCP_DBF_HBA_BIT; 257 rec->fsf_req_id = req->req_id; 258 rec->fsf_req_status = req->status; 259 rec->fsf_cmd = FSF_QTCB_UNSOLICITED_STATUS; 260 memcpy(&rec->u.be, &sr_buf->payload.bit_error, 261 sizeof(struct fsf_bit_error_payload)); 262 263 debug_event(dbf->hba, level, rec, sizeof(*rec)); 264 spin_unlock_irqrestore(&dbf->hba_lock, flags); 265} 266 267/** 268 * zfcp_dbf_hba_def_err - trace event for deferred error messages 269 * @adapter: pointer to struct zfcp_adapter 270 * @req_id: request id which caused the deferred error message 271 * @scount: number of sbals incl. the signaling sbal 272 * @pl: array of all involved sbals 273 */ 274void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount, 275 void **pl) 276{ 277 struct zfcp_dbf *dbf = adapter->dbf; 278 struct zfcp_dbf_pay *payload = &dbf->pay_buf; 279 unsigned long flags; 280 static int const level = 1; 281 u16 length; 282 283 if (unlikely(!debug_level_enabled(dbf->pay, level))) 284 return; 285 286 if (!pl) 287 return; 288 289 spin_lock_irqsave(&dbf->pay_lock, flags); 290 memset(payload, 0, sizeof(*payload)); 291 292 memcpy(payload->area, "def_err", 7); 293 payload->fsf_req_id = req_id; 294 payload->counter = 0; 295 length = min((u16)sizeof(struct qdio_buffer), 296 (u16)ZFCP_DBF_PAY_MAX_REC); 297 298 while (payload->counter < scount && (char *)pl[payload->counter]) { 299 memcpy(payload->data, (char *)pl[payload->counter], length); 300 debug_event(dbf->pay, level, payload, zfcp_dbf_plen(length)); 301 payload->counter++; 302 } 303 304 spin_unlock_irqrestore(&dbf->pay_lock, flags); 305} 306 307static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec, 308 struct zfcp_adapter *adapter, 309 struct zfcp_port *port, 310 struct scsi_device *sdev) 311{ 312 rec->adapter_status = atomic_read(&adapter->status); 313 if (port) { 314 rec->port_status = atomic_read(&port->status); 315 rec->wwpn = port->wwpn; 316 rec->d_id = port->d_id; 317 } 318 if (sdev) { 319 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status); 320 rec->lun = zfcp_scsi_dev_lun(sdev); 321 } else 322 rec->lun = ZFCP_DBF_INVALID_LUN; 323} 324 325/** 326 * zfcp_dbf_rec_trig - trace event related to triggered recovery 327 * @tag: identifier for event 328 * @adapter: adapter on which the erp_action should run 329 * @port: remote port involved in the erp_action 330 * @sdev: scsi device involved in the erp_action 331 * @want: wanted erp_action 332 * @need: required erp_action 333 * 334 * The adapter->erp_lock has to be held. 335 */ 336void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter, 337 struct zfcp_port *port, struct scsi_device *sdev, 338 u8 want, u8 need) 339{ 340 struct zfcp_dbf *dbf = adapter->dbf; 341 struct zfcp_dbf_rec *rec = &dbf->rec_buf; 342 static int const level = 1; 343 struct list_head *entry; 344 unsigned long flags; 345 346 lockdep_assert_held(&adapter->erp_lock); 347 348 if (unlikely(!debug_level_enabled(dbf->rec, level))) 349 return; 350 351 spin_lock_irqsave(&dbf->rec_lock, flags); 352 memset(rec, 0, sizeof(*rec)); 353 354 rec->id = ZFCP_DBF_REC_TRIG; 355 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 356 zfcp_dbf_set_common(rec, adapter, port, sdev); 357 358 list_for_each(entry, &adapter->erp_ready_head) 359 rec->u.trig.ready++; 360 361 list_for_each(entry, &adapter->erp_running_head) 362 rec->u.trig.running++; 363 364 rec->u.trig.want = want; 365 rec->u.trig.need = need; 366 367 debug_event(dbf->rec, level, rec, sizeof(*rec)); 368 spin_unlock_irqrestore(&dbf->rec_lock, flags); 369} 370 371/** 372 * zfcp_dbf_rec_trig_lock - trace event related to triggered recovery with lock 373 * @tag: identifier for event 374 * @adapter: adapter on which the erp_action should run 375 * @port: remote port involved in the erp_action 376 * @sdev: scsi device involved in the erp_action 377 * @want: wanted erp_action 378 * @need: required erp_action 379 * 380 * The adapter->erp_lock must not be held. 381 */ 382void zfcp_dbf_rec_trig_lock(char *tag, struct zfcp_adapter *adapter, 383 struct zfcp_port *port, struct scsi_device *sdev, 384 u8 want, u8 need) 385{ 386 unsigned long flags; 387 388 read_lock_irqsave(&adapter->erp_lock, flags); 389 zfcp_dbf_rec_trig(tag, adapter, port, sdev, want, need); 390 read_unlock_irqrestore(&adapter->erp_lock, flags); 391} 392 393/** 394 * zfcp_dbf_rec_run_lvl - trace event related to running recovery 395 * @level: trace level to be used for event 396 * @tag: identifier for event 397 * @erp: erp_action running 398 */ 399void zfcp_dbf_rec_run_lvl(int level, char *tag, struct zfcp_erp_action *erp) 400{ 401 struct zfcp_dbf *dbf = erp->adapter->dbf; 402 struct zfcp_dbf_rec *rec = &dbf->rec_buf; 403 unsigned long flags; 404 405 if (!debug_level_enabled(dbf->rec, level)) 406 return; 407 408 spin_lock_irqsave(&dbf->rec_lock, flags); 409 memset(rec, 0, sizeof(*rec)); 410 411 rec->id = ZFCP_DBF_REC_RUN; 412 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 413 zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev); 414 415 rec->u.run.fsf_req_id = erp->fsf_req_id; 416 rec->u.run.rec_status = erp->status; 417 rec->u.run.rec_step = erp->step; 418 rec->u.run.rec_action = erp->type; 419 420 if (erp->sdev) 421 rec->u.run.rec_count = 422 atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter); 423 else if (erp->port) 424 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter); 425 else 426 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter); 427 428 debug_event(dbf->rec, level, rec, sizeof(*rec)); 429 spin_unlock_irqrestore(&dbf->rec_lock, flags); 430} 431 432/** 433 * zfcp_dbf_rec_run - trace event related to running recovery 434 * @tag: identifier for event 435 * @erp: erp_action running 436 */ 437void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp) 438{ 439 zfcp_dbf_rec_run_lvl(1, tag, erp); 440} 441 442/** 443 * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery 444 * @tag: identifier for event 445 * @wka_port: well known address port 446 * @req_id: request ID to correlate with potential HBA trace record 447 */ 448void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port, 449 u64 req_id) 450{ 451 struct zfcp_dbf *dbf = wka_port->adapter->dbf; 452 struct zfcp_dbf_rec *rec = &dbf->rec_buf; 453 static int const level = 1; 454 unsigned long flags; 455 456 if (unlikely(!debug_level_enabled(dbf->rec, level))) 457 return; 458 459 spin_lock_irqsave(&dbf->rec_lock, flags); 460 memset(rec, 0, sizeof(*rec)); 461 462 rec->id = ZFCP_DBF_REC_RUN; 463 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 464 rec->port_status = wka_port->status; 465 rec->d_id = wka_port->d_id; 466 rec->lun = ZFCP_DBF_INVALID_LUN; 467 468 rec->u.run.fsf_req_id = req_id; 469 rec->u.run.rec_status = ~0; 470 rec->u.run.rec_step = ~0; 471 rec->u.run.rec_action = ~0; 472 rec->u.run.rec_count = ~0; 473 474 debug_event(dbf->rec, level, rec, sizeof(*rec)); 475 spin_unlock_irqrestore(&dbf->rec_lock, flags); 476} 477 478#define ZFCP_DBF_SAN_LEVEL 1 479 480static inline 481void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, 482 char *paytag, struct scatterlist *sg, u8 id, u16 len, 483 u64 req_id, u32 d_id, u16 cap_len) 484{ 485 struct zfcp_dbf_san *rec = &dbf->san_buf; 486 u16 rec_len; 487 unsigned long flags; 488 struct zfcp_dbf_pay *payload = &dbf->pay_buf; 489 u16 pay_sum = 0; 490 491 spin_lock_irqsave(&dbf->san_lock, flags); 492 memset(rec, 0, sizeof(*rec)); 493 494 rec->id = id; 495 rec->fsf_req_id = req_id; 496 rec->d_id = d_id; 497 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 498 rec->pl_len = len; /* full length even if we cap pay below */ 499 if (!sg) 500 goto out; 501 rec_len = min_t(unsigned int, sg->length, ZFCP_DBF_SAN_MAX_PAYLOAD); 502 memcpy(rec->payload, sg_virt(sg), rec_len); /* part of 1st sg entry */ 503 if (len <= rec_len) 504 goto out; /* skip pay record if full content in rec->payload */ 505 506 /* if (len > rec_len): 507 * dump data up to cap_len ignoring small duplicate in rec->payload 508 */ 509 spin_lock(&dbf->pay_lock); 510 memset(payload, 0, sizeof(*payload)); 511 memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN); 512 payload->fsf_req_id = req_id; 513 payload->counter = 0; 514 for (; sg && pay_sum < cap_len; sg = sg_next(sg)) { 515 u16 pay_len, offset = 0; 516 517 while (offset < sg->length && pay_sum < cap_len) { 518 pay_len = min((u16)ZFCP_DBF_PAY_MAX_REC, 519 (u16)(sg->length - offset)); 520 /* cap_len <= pay_sum < cap_len+ZFCP_DBF_PAY_MAX_REC */ 521 memcpy(payload->data, sg_virt(sg) + offset, pay_len); 522 debug_event(dbf->pay, ZFCP_DBF_SAN_LEVEL, payload, 523 zfcp_dbf_plen(pay_len)); 524 payload->counter++; 525 offset += pay_len; 526 pay_sum += pay_len; 527 } 528 } 529 spin_unlock(&dbf->pay_lock); 530 531out: 532 debug_event(dbf->san, ZFCP_DBF_SAN_LEVEL, rec, sizeof(*rec)); 533 spin_unlock_irqrestore(&dbf->san_lock, flags); 534} 535 536/** 537 * zfcp_dbf_san_req - trace event for issued SAN request 538 * @tag: identifier for event 539 * @fsf: request containing issued CT or ELS data 540 * @d_id: N_Port_ID where SAN request is sent to 541 * d_id: destination ID 542 */ 543void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id) 544{ 545 struct zfcp_dbf *dbf = fsf->adapter->dbf; 546 struct zfcp_fsf_ct_els *ct_els = fsf->data; 547 u16 length; 548 549 if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL))) 550 return; 551 552 length = (u16)zfcp_qdio_real_bytes(ct_els->req); 553 zfcp_dbf_san(tag, dbf, "san_req", ct_els->req, ZFCP_DBF_SAN_REQ, 554 length, fsf->req_id, d_id, length); 555} 556 557static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag, 558 struct zfcp_fsf_req *fsf, 559 u16 len) 560{ 561 struct zfcp_fsf_ct_els *ct_els = fsf->data; 562 struct fc_ct_hdr *reqh = sg_virt(ct_els->req); 563 struct fc_ns_gid_ft *reqn = (struct fc_ns_gid_ft *)(reqh + 1); 564 struct scatterlist *resp_entry = ct_els->resp; 565 struct fc_ct_hdr *resph; 566 struct fc_gpn_ft_resp *acc; 567 int max_entries, x, last = 0; 568 569 if (!(memcmp(tag, "fsscth2", 7) == 0 570 && ct_els->d_id == FC_FID_DIR_SERV 571 && reqh->ct_rev == FC_CT_REV 572 && reqh->ct_in_id[0] == 0 573 && reqh->ct_in_id[1] == 0 574 && reqh->ct_in_id[2] == 0 575 && reqh->ct_fs_type == FC_FST_DIR 576 && reqh->ct_fs_subtype == FC_NS_SUBTYPE 577 && reqh->ct_options == 0 578 && reqh->_ct_resvd1 == 0 579 && reqh->ct_cmd == cpu_to_be16(FC_NS_GPN_FT) 580 /* reqh->ct_mr_size can vary so do not match but read below */ 581 && reqh->_ct_resvd2 == 0 582 && reqh->ct_reason == 0 583 && reqh->ct_explan == 0 584 && reqh->ct_vendor == 0 585 && reqn->fn_resvd == 0 586 && reqn->fn_domain_id_scope == 0 587 && reqn->fn_area_id_scope == 0 588 && reqn->fn_fc4_type == FC_TYPE_FCP)) 589 return len; /* not GPN_FT response so do not cap */ 590 591 acc = sg_virt(resp_entry); 592 593 /* cap all but accept CT responses to at least the CT header */ 594 resph = (struct fc_ct_hdr *)acc; 595 if ((ct_els->status) || 596 (resph->ct_cmd != cpu_to_be16(FC_FS_ACC))) 597 return max(FC_CT_HDR_LEN, ZFCP_DBF_SAN_MAX_PAYLOAD); 598 599 max_entries = (be16_to_cpu(reqh->ct_mr_size) * 4 / 600 sizeof(struct fc_gpn_ft_resp)) 601 + 1 /* zfcp_fc_scan_ports: bytes correct, entries off-by-one 602 * to account for header as 1st pseudo "entry" */; 603 604 /* the basic CT_IU preamble is the same size as one entry in the GPN_FT 605 * response, allowing us to skip special handling for it - just skip it 606 */ 607 for (x = 1; x < max_entries && !last; x++) { 608 if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1)) 609 acc++; 610 else 611 acc = sg_virt(++resp_entry); 612 613 last = acc->fp_flags & FC_NS_FID_LAST; 614 } 615 len = min(len, (u16)(x * sizeof(struct fc_gpn_ft_resp))); 616 return len; /* cap after last entry */ 617} 618 619/** 620 * zfcp_dbf_san_res - trace event for received SAN request 621 * @tag: identifier for event 622 * @fsf: request containing received CT or ELS data 623 */ 624void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf) 625{ 626 struct zfcp_dbf *dbf = fsf->adapter->dbf; 627 struct zfcp_fsf_ct_els *ct_els = fsf->data; 628 u16 length; 629 630 if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL))) 631 return; 632 633 length = (u16)zfcp_qdio_real_bytes(ct_els->resp); 634 zfcp_dbf_san(tag, dbf, "san_res", ct_els->resp, ZFCP_DBF_SAN_RES, 635 length, fsf->req_id, ct_els->d_id, 636 zfcp_dbf_san_res_cap_len_if_gpn_ft(tag, fsf, length)); 637} 638 639/** 640 * zfcp_dbf_san_in_els - trace event for incoming ELS 641 * @tag: identifier for event 642 * @fsf: request containing received ELS data 643 */ 644void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf) 645{ 646 struct zfcp_dbf *dbf = fsf->adapter->dbf; 647 struct fsf_status_read_buffer *srb = 648 (struct fsf_status_read_buffer *) fsf->data; 649 u16 length; 650 struct scatterlist sg; 651 652 if (unlikely(!debug_level_enabled(dbf->san, ZFCP_DBF_SAN_LEVEL))) 653 return; 654 655 length = (u16)(srb->length - 656 offsetof(struct fsf_status_read_buffer, payload)); 657 sg_init_one(&sg, srb->payload.data, length); 658 zfcp_dbf_san(tag, dbf, "san_els", &sg, ZFCP_DBF_SAN_ELS, length, 659 fsf->req_id, ntoh24(srb->d_id), length); 660} 661 662/** 663 * zfcp_dbf_scsi_common() - Common trace event helper for scsi. 664 * @tag: Identifier for event. 665 * @level: trace level of event. 666 * @sdev: Pointer to SCSI device as context for this event. 667 * @sc: Pointer to SCSI command, or NULL with task management function (TMF). 668 * @fsf: Pointer to FSF request, or NULL. 669 */ 670void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev, 671 struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf) 672{ 673 struct zfcp_adapter *adapter = 674 (struct zfcp_adapter *) sdev->host->hostdata[0]; 675 struct zfcp_dbf *dbf = adapter->dbf; 676 struct zfcp_dbf_scsi *rec = &dbf->scsi_buf; 677 struct fcp_resp_with_ext *fcp_rsp; 678 struct fcp_resp_rsp_info *fcp_rsp_info; 679 unsigned long flags; 680 681 spin_lock_irqsave(&dbf->scsi_lock, flags); 682 memset(rec, 0, sizeof(*rec)); 683 684 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 685 rec->id = ZFCP_DBF_SCSI_CMND; 686 if (sc) { 687 rec->scsi_result = sc->result; 688 rec->scsi_retries = sc->retries; 689 rec->scsi_allowed = sc->allowed; 690 rec->scsi_id = sc->device->id; 691 rec->scsi_lun = (u32)sc->device->lun; 692 rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32); 693 rec->host_scribble = (u64)sc->host_scribble; 694 695 memcpy(rec->scsi_opcode, sc->cmnd, 696 min_t(int, sc->cmd_len, ZFCP_DBF_SCSI_OPCODE)); 697 } else { 698 rec->scsi_result = ~0; 699 rec->scsi_retries = ~0; 700 rec->scsi_allowed = ~0; 701 rec->scsi_id = sdev->id; 702 rec->scsi_lun = (u32)sdev->lun; 703 rec->scsi_lun_64_hi = (u32)(sdev->lun >> 32); 704 rec->host_scribble = ~0; 705 706 memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE); 707 } 708 709 if (fsf) { 710 rec->fsf_req_id = fsf->req_id; 711 rec->pl_len = FCP_RESP_WITH_EXT; 712 fcp_rsp = &(fsf->qtcb->bottom.io.fcp_rsp.iu); 713 /* mandatory parts of FCP_RSP IU in this SCSI record */ 714 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT); 715 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) { 716 fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1]; 717 rec->fcp_rsp_info = fcp_rsp_info->rsp_code; 718 rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_rsp_len); 719 } 720 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) { 721 rec->pl_len += be32_to_cpu(fcp_rsp->ext.fr_sns_len); 722 } 723 /* complete FCP_RSP IU in associated PAYload record 724 * but only if there are optional parts 725 */ 726 if (fcp_rsp->resp.fr_flags != 0) 727 zfcp_dbf_pl_write( 728 dbf, fcp_rsp, 729 /* at least one full PAY record 730 * but not beyond hardware response field 731 */ 732 min_t(u16, max_t(u16, rec->pl_len, 733 ZFCP_DBF_PAY_MAX_REC), 734 FSF_FCP_RSP_SIZE), 735 "fcp_riu", fsf->req_id); 736 } 737 738 debug_event(dbf->scsi, level, rec, sizeof(*rec)); 739 spin_unlock_irqrestore(&dbf->scsi_lock, flags); 740} 741 742/** 743 * zfcp_dbf_scsi_eh() - Trace event for special cases of scsi_eh callbacks. 744 * @tag: Identifier for event. 745 * @adapter: Pointer to zfcp adapter as context for this event. 746 * @scsi_id: SCSI ID/target to indicate scope of task management function (TMF). 747 * @ret: Return value of calling function. 748 * 749 * This SCSI trace variant does not depend on any of: 750 * scsi_cmnd, zfcp_fsf_req, scsi_device. 751 */ 752void zfcp_dbf_scsi_eh(char *tag, struct zfcp_adapter *adapter, 753 unsigned int scsi_id, int ret) 754{ 755 struct zfcp_dbf *dbf = adapter->dbf; 756 struct zfcp_dbf_scsi *rec = &dbf->scsi_buf; 757 unsigned long flags; 758 static int const level = 1; 759 760 if (unlikely(!debug_level_enabled(adapter->dbf->scsi, level))) 761 return; 762 763 spin_lock_irqsave(&dbf->scsi_lock, flags); 764 memset(rec, 0, sizeof(*rec)); 765 766 memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN); 767 rec->id = ZFCP_DBF_SCSI_CMND; 768 rec->scsi_result = ret; /* re-use field, int is 4 bytes and fits */ 769 rec->scsi_retries = ~0; 770 rec->scsi_allowed = ~0; 771 rec->fcp_rsp_info = ~0; 772 rec->scsi_id = scsi_id; 773 rec->scsi_lun = (u32)ZFCP_DBF_INVALID_LUN; 774 rec->scsi_lun_64_hi = (u32)(ZFCP_DBF_INVALID_LUN >> 32); 775 rec->host_scribble = ~0; 776 memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE); 777 778 debug_event(dbf->scsi, level, rec, sizeof(*rec)); 779 spin_unlock_irqrestore(&dbf->scsi_lock, flags); 780} 781 782static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size) 783{ 784 struct debug_info *d; 785 786 d = debug_register(name, size, 1, rec_size); 787 if (!d) 788 return NULL; 789 790 debug_register_view(d, &debug_hex_ascii_view); 791 debug_set_level(d, dbflevel); 792 793 return d; 794} 795 796static void zfcp_dbf_unregister(struct zfcp_dbf *dbf) 797{ 798 if (!dbf) 799 return; 800 801 debug_unregister(dbf->scsi); 802 debug_unregister(dbf->san); 803 debug_unregister(dbf->hba); 804 debug_unregister(dbf->pay); 805 debug_unregister(dbf->rec); 806 kfree(dbf); 807} 808 809/** 810 * zfcp_dbf_adapter_register - registers debug feature for an adapter 811 * @adapter: pointer to adapter for which debug features should be registered 812 * return: -ENOMEM on error, 0 otherwise 813 */ 814int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter) 815{ 816 char name[DEBUG_MAX_NAME_LEN]; 817 struct zfcp_dbf *dbf; 818 819 dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL); 820 if (!dbf) 821 return -ENOMEM; 822 823 spin_lock_init(&dbf->pay_lock); 824 spin_lock_init(&dbf->hba_lock); 825 spin_lock_init(&dbf->san_lock); 826 spin_lock_init(&dbf->scsi_lock); 827 spin_lock_init(&dbf->rec_lock); 828 829 /* debug feature area which records recovery activity */ 830 sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev)); 831 dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec)); 832 if (!dbf->rec) 833 goto err_out; 834 835 /* debug feature area which records HBA (FSF and QDIO) conditions */ 836 sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev)); 837 dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba)); 838 if (!dbf->hba) 839 goto err_out; 840 841 /* debug feature area which records payload info */ 842 sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev)); 843 dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay)); 844 if (!dbf->pay) 845 goto err_out; 846 847 /* debug feature area which records SAN command failures and recovery */ 848 sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev)); 849 dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san)); 850 if (!dbf->san) 851 goto err_out; 852 853 /* debug feature area which records SCSI command failures and recovery */ 854 sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev)); 855 dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi)); 856 if (!dbf->scsi) 857 goto err_out; 858 859 adapter->dbf = dbf; 860 861 return 0; 862err_out: 863 zfcp_dbf_unregister(dbf); 864 return -ENOMEM; 865} 866 867/** 868 * zfcp_dbf_adapter_unregister - unregisters debug feature for an adapter 869 * @adapter: pointer to adapter for which debug features should be unregistered 870 */ 871void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter) 872{ 873 struct zfcp_dbf *dbf = adapter->dbf; 874 875 adapter->dbf = NULL; 876 zfcp_dbf_unregister(dbf); 877} 878
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