1 /* 2 * Author(s)......: Horst Hummel <Horst.Hummel@de.ibm.com> 3 * Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Bugreports.to..: <Linux390@de.ibm.com> 5 * Copyright IBM Corp. 2000, 2001 6 * 7 */ 8 9 #define KMSG_COMPONENT "dasd-eckd" 10 11 #include <linux/timer.h> 12 #include <asm/idals.h> 13 14 #define PRINTK_HEADER "dasd_erp(3990): " 15 16 #include "dasd_int.h" 17 #include "dasd_eckd.h" 18 19 20 struct DCTL_data { 21 unsigned char subcommand; /* e.g Inhibit Write, Enable Write,... */ 22 unsigned char modifier; /* Subcommand modifier */ 23 unsigned short res; /* reserved */ 24 } __attribute__ ((packed)); 25 26 /* 27 ***************************************************************************** 28 * SECTION ERP HANDLING 29 ***************************************************************************** 30 */ 31 /* 32 ***************************************************************************** 33 * 24 and 32 byte sense ERP functions 34 ***************************************************************************** 35 */ 36 37 /* 38 * DASD_3990_ERP_CLEANUP 39 * 40 * DESCRIPTION 41 * Removes the already build but not necessary ERP request and sets 42 * the status of the original cqr / erp to the given (final) status 43 * 44 * PARAMETER 45 * erp request to be blocked 46 * final_status either DASD_CQR_DONE or DASD_CQR_FAILED 47 * 48 * RETURN VALUES 49 * cqr original cqr 50 */ 51 static struct dasd_ccw_req * 52 dasd_3990_erp_cleanup(struct dasd_ccw_req * erp, char final_status) 53 { 54 struct dasd_ccw_req *cqr = erp->refers; 55 56 dasd_free_erp_request(erp, erp->memdev); 57 cqr->status = final_status; 58 return cqr; 59 60 } /* end dasd_3990_erp_cleanup */ 61 62 /* 63 * DASD_3990_ERP_BLOCK_QUEUE 64 * 65 * DESCRIPTION 66 * Block the given device request queue to prevent from further 67 * processing until the started timer has expired or an related 68 * interrupt was received. 69 */ 70 static void dasd_3990_erp_block_queue(struct dasd_ccw_req *erp, int expires) 71 { 72 73 struct dasd_device *device = erp->startdev; 74 unsigned long flags; 75 76 DBF_DEV_EVENT(DBF_INFO, device, 77 "blocking request queue for %is", expires/HZ); 78 79 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 80 dasd_device_set_stop_bits(device, DASD_STOPPED_PENDING); 81 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 82 erp->status = DASD_CQR_FILLED; 83 if (erp->block) 84 dasd_block_set_timer(erp->block, expires); 85 else 86 dasd_device_set_timer(device, expires); 87 } 88 89 /* 90 * DASD_3990_ERP_INT_REQ 91 * 92 * DESCRIPTION 93 * Handles 'Intervention Required' error. 94 * This means either device offline or not installed. 95 * 96 * PARAMETER 97 * erp current erp 98 * RETURN VALUES 99 * erp modified erp 100 */ 101 static struct dasd_ccw_req * 102 dasd_3990_erp_int_req(struct dasd_ccw_req * erp) 103 { 104 105 struct dasd_device *device = erp->startdev; 106 107 /* first time set initial retry counter and erp_function */ 108 /* and retry once without blocking queue */ 109 /* (this enables easier enqueing of the cqr) */ 110 if (erp->function != dasd_3990_erp_int_req) { 111 112 erp->retries = 256; 113 erp->function = dasd_3990_erp_int_req; 114 115 } else { 116 117 /* issue a message and wait for 'device ready' interrupt */ 118 dev_err(&device->cdev->dev, 119 "is offline or not installed - " 120 "INTERVENTION REQUIRED!!\n"); 121 122 dasd_3990_erp_block_queue(erp, 60*HZ); 123 } 124 125 return erp; 126 127 } /* end dasd_3990_erp_int_req */ 128 129 /* 130 * DASD_3990_ERP_ALTERNATE_PATH 131 * 132 * DESCRIPTION 133 * Repeat the operation on a different channel path. 134 * If all alternate paths have been tried, the request is posted with a 135 * permanent error. 136 * 137 * PARAMETER 138 * erp pointer to the current ERP 139 * 140 * RETURN VALUES 141 * erp modified pointer to the ERP 142 */ 143 static void 144 dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp) 145 { 146 struct dasd_device *device = erp->startdev; 147 __u8 opm; 148 unsigned long flags; 149 150 /* try alternate valid path */ 151 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 152 opm = ccw_device_get_path_mask(device->cdev); 153 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 154 if (erp->lpm == 0) 155 erp->lpm = dasd_path_get_opm(device) & 156 ~(erp->irb.esw.esw0.sublog.lpum); 157 else 158 erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum); 159 160 if ((erp->lpm & opm) != 0x00) { 161 162 DBF_DEV_EVENT(DBF_WARNING, device, 163 "try alternate lpm=%x (lpum=%x / opm=%x)", 164 erp->lpm, erp->irb.esw.esw0.sublog.lpum, opm); 165 166 /* reset status to submit the request again... */ 167 erp->status = DASD_CQR_FILLED; 168 erp->retries = 10; 169 } else { 170 dev_err(&device->cdev->dev, 171 "The DASD cannot be reached on any path (lpum=%x" 172 "/opm=%x)\n", erp->irb.esw.esw0.sublog.lpum, opm); 173 174 /* post request with permanent error */ 175 erp->status = DASD_CQR_FAILED; 176 } 177 } /* end dasd_3990_erp_alternate_path */ 178 179 /* 180 * DASD_3990_ERP_DCTL 181 * 182 * DESCRIPTION 183 * Setup cqr to do the Diagnostic Control (DCTL) command with an 184 * Inhibit Write subcommand (0x20) and the given modifier. 185 * 186 * PARAMETER 187 * erp pointer to the current (failed) ERP 188 * modifier subcommand modifier 189 * 190 * RETURN VALUES 191 * dctl_cqr pointer to NEW dctl_cqr 192 * 193 */ 194 static struct dasd_ccw_req * 195 dasd_3990_erp_DCTL(struct dasd_ccw_req * erp, char modifier) 196 { 197 198 struct dasd_device *device = erp->startdev; 199 struct DCTL_data *DCTL_data; 200 struct ccw1 *ccw; 201 struct dasd_ccw_req *dctl_cqr; 202 203 dctl_cqr = dasd_alloc_erp_request((char *) &erp->magic, 1, 204 sizeof(struct DCTL_data), 205 device); 206 if (IS_ERR(dctl_cqr)) { 207 dev_err(&device->cdev->dev, 208 "Unable to allocate DCTL-CQR\n"); 209 erp->status = DASD_CQR_FAILED; 210 return erp; 211 } 212 213 DCTL_data = dctl_cqr->data; 214 215 DCTL_data->subcommand = 0x02; /* Inhibit Write */ 216 DCTL_data->modifier = modifier; 217 218 ccw = dctl_cqr->cpaddr; 219 memset(ccw, 0, sizeof(struct ccw1)); 220 ccw->cmd_code = CCW_CMD_DCTL; 221 ccw->count = 4; 222 ccw->cda = (__u32)(addr_t) DCTL_data; 223 dctl_cqr->flags = erp->flags; 224 dctl_cqr->function = dasd_3990_erp_DCTL; 225 dctl_cqr->refers = erp; 226 dctl_cqr->startdev = device; 227 dctl_cqr->memdev = device; 228 dctl_cqr->magic = erp->magic; 229 dctl_cqr->expires = 5 * 60 * HZ; 230 dctl_cqr->retries = 2; 231 232 dctl_cqr->buildclk = get_tod_clock(); 233 234 dctl_cqr->status = DASD_CQR_FILLED; 235 236 return dctl_cqr; 237 238 } /* end dasd_3990_erp_DCTL */ 239 240 /* 241 * DASD_3990_ERP_ACTION_1 242 * 243 * DESCRIPTION 244 * Setup ERP to do the ERP action 1 (see Reference manual). 245 * Repeat the operation on a different channel path. 246 * As deviation from the recommended recovery action, we reset the path mask 247 * after we have tried each path and go through all paths a second time. 248 * This will cover situations where only one path at a time is actually down, 249 * but all paths fail and recover just with the same sequence and timing as 250 * we try to use them (flapping links). 251 * If all alternate paths have been tried twice, the request is posted with 252 * a permanent error. 253 * 254 * PARAMETER 255 * erp pointer to the current ERP 256 * 257 * RETURN VALUES 258 * erp pointer to the ERP 259 * 260 */ 261 static struct dasd_ccw_req *dasd_3990_erp_action_1_sec(struct dasd_ccw_req *erp) 262 { 263 erp->function = dasd_3990_erp_action_1_sec; 264 dasd_3990_erp_alternate_path(erp); 265 return erp; 266 } 267 268 static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp) 269 { 270 erp->function = dasd_3990_erp_action_1; 271 dasd_3990_erp_alternate_path(erp); 272 if (erp->status == DASD_CQR_FAILED && 273 !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) { 274 erp->status = DASD_CQR_FILLED; 275 erp->retries = 10; 276 erp->lpm = dasd_path_get_opm(erp->startdev); 277 erp->function = dasd_3990_erp_action_1_sec; 278 } 279 return erp; 280 } /* end dasd_3990_erp_action_1(b) */ 281 282 /* 283 * DASD_3990_ERP_ACTION_4 284 * 285 * DESCRIPTION 286 * Setup ERP to do the ERP action 4 (see Reference manual). 287 * Set the current request to PENDING to block the CQR queue for that device 288 * until the state change interrupt appears. 289 * Use a timer (20 seconds) to retry the cqr if the interrupt is still 290 * missing. 291 * 292 * PARAMETER 293 * sense sense data of the actual error 294 * erp pointer to the current ERP 295 * 296 * RETURN VALUES 297 * erp pointer to the ERP 298 * 299 */ 300 static struct dasd_ccw_req * 301 dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense) 302 { 303 304 struct dasd_device *device = erp->startdev; 305 306 /* first time set initial retry counter and erp_function */ 307 /* and retry once without waiting for state change pending */ 308 /* interrupt (this enables easier enqueing of the cqr) */ 309 if (erp->function != dasd_3990_erp_action_4) { 310 311 DBF_DEV_EVENT(DBF_INFO, device, "%s", 312 "dasd_3990_erp_action_4: first time retry"); 313 314 erp->retries = 256; 315 erp->function = dasd_3990_erp_action_4; 316 317 } else { 318 if (sense && (sense[25] == 0x1D)) { /* state change pending */ 319 320 DBF_DEV_EVENT(DBF_INFO, device, 321 "waiting for state change pending " 322 "interrupt, %d retries left", 323 erp->retries); 324 325 dasd_3990_erp_block_queue(erp, 30*HZ); 326 327 } else if (sense && (sense[25] == 0x1E)) { /* busy */ 328 DBF_DEV_EVENT(DBF_INFO, device, 329 "busy - redriving request later, " 330 "%d retries left", 331 erp->retries); 332 dasd_3990_erp_block_queue(erp, HZ); 333 } else { 334 /* no state change pending - retry */ 335 DBF_DEV_EVENT(DBF_INFO, device, 336 "redriving request immediately, " 337 "%d retries left", 338 erp->retries); 339 erp->status = DASD_CQR_FILLED; 340 } 341 } 342 343 return erp; 344 345 } /* end dasd_3990_erp_action_4 */ 346 347 /* 348 ***************************************************************************** 349 * 24 byte sense ERP functions (only) 350 ***************************************************************************** 351 */ 352 353 /* 354 * DASD_3990_ERP_ACTION_5 355 * 356 * DESCRIPTION 357 * Setup ERP to do the ERP action 5 (see Reference manual). 358 * NOTE: Further handling is done in xxx_further_erp after the retries. 359 * 360 * PARAMETER 361 * erp pointer to the current ERP 362 * 363 * RETURN VALUES 364 * erp pointer to the ERP 365 * 366 */ 367 static struct dasd_ccw_req * 368 dasd_3990_erp_action_5(struct dasd_ccw_req * erp) 369 { 370 371 /* first of all retry */ 372 erp->retries = 10; 373 erp->function = dasd_3990_erp_action_5; 374 375 return erp; 376 377 } /* end dasd_3990_erp_action_5 */ 378 379 /* 380 * DASD_3990_HANDLE_ENV_DATA 381 * 382 * DESCRIPTION 383 * Handles 24 byte 'Environmental data present'. 384 * Does a analysis of the sense data (message Format) 385 * and prints the error messages. 386 * 387 * PARAMETER 388 * sense current sense data 389 * 390 * RETURN VALUES 391 * void 392 */ 393 static void 394 dasd_3990_handle_env_data(struct dasd_ccw_req * erp, char *sense) 395 { 396 397 struct dasd_device *device = erp->startdev; 398 char msg_format = (sense[7] & 0xF0); 399 char msg_no = (sense[7] & 0x0F); 400 char errorstring[ERRORLENGTH]; 401 402 switch (msg_format) { 403 case 0x00: /* Format 0 - Program or System Checks */ 404 405 if (sense[1] & 0x10) { /* check message to operator bit */ 406 407 switch (msg_no) { 408 case 0x00: /* No Message */ 409 break; 410 case 0x01: 411 dev_warn(&device->cdev->dev, 412 "FORMAT 0 - Invalid Command\n"); 413 break; 414 case 0x02: 415 dev_warn(&device->cdev->dev, 416 "FORMAT 0 - Invalid Command " 417 "Sequence\n"); 418 break; 419 case 0x03: 420 dev_warn(&device->cdev->dev, 421 "FORMAT 0 - CCW Count less than " 422 "required\n"); 423 break; 424 case 0x04: 425 dev_warn(&device->cdev->dev, 426 "FORMAT 0 - Invalid Parameter\n"); 427 break; 428 case 0x05: 429 dev_warn(&device->cdev->dev, 430 "FORMAT 0 - Diagnostic of Special" 431 " Command Violates File Mask\n"); 432 break; 433 case 0x07: 434 dev_warn(&device->cdev->dev, 435 "FORMAT 0 - Channel Returned with " 436 "Incorrect retry CCW\n"); 437 break; 438 case 0x08: 439 dev_warn(&device->cdev->dev, 440 "FORMAT 0 - Reset Notification\n"); 441 break; 442 case 0x09: 443 dev_warn(&device->cdev->dev, 444 "FORMAT 0 - Storage Path Restart\n"); 445 break; 446 case 0x0A: 447 dev_warn(&device->cdev->dev, 448 "FORMAT 0 - Channel requested " 449 "... %02x\n", sense[8]); 450 break; 451 case 0x0B: 452 dev_warn(&device->cdev->dev, 453 "FORMAT 0 - Invalid Defective/" 454 "Alternate Track Pointer\n"); 455 break; 456 case 0x0C: 457 dev_warn(&device->cdev->dev, 458 "FORMAT 0 - DPS Installation " 459 "Check\n"); 460 break; 461 case 0x0E: 462 dev_warn(&device->cdev->dev, 463 "FORMAT 0 - Command Invalid on " 464 "Secondary Address\n"); 465 break; 466 case 0x0F: 467 dev_warn(&device->cdev->dev, 468 "FORMAT 0 - Status Not As " 469 "Required: reason %02x\n", 470 sense[8]); 471 break; 472 default: 473 dev_warn(&device->cdev->dev, 474 "FORMAT 0 - Reserved\n"); 475 } 476 } else { 477 switch (msg_no) { 478 case 0x00: /* No Message */ 479 break; 480 case 0x01: 481 dev_warn(&device->cdev->dev, 482 "FORMAT 0 - Device Error " 483 "Source\n"); 484 break; 485 case 0x02: 486 dev_warn(&device->cdev->dev, 487 "FORMAT 0 - Reserved\n"); 488 break; 489 case 0x03: 490 dev_warn(&device->cdev->dev, 491 "FORMAT 0 - Device Fenced - " 492 "device = %02x\n", sense[4]); 493 break; 494 case 0x04: 495 dev_warn(&device->cdev->dev, 496 "FORMAT 0 - Data Pinned for " 497 "Device\n"); 498 break; 499 default: 500 dev_warn(&device->cdev->dev, 501 "FORMAT 0 - Reserved\n"); 502 } 503 } 504 break; 505 506 case 0x10: /* Format 1 - Device Equipment Checks */ 507 switch (msg_no) { 508 case 0x00: /* No Message */ 509 break; 510 case 0x01: 511 dev_warn(&device->cdev->dev, 512 "FORMAT 1 - Device Status 1 not as " 513 "expected\n"); 514 break; 515 case 0x03: 516 dev_warn(&device->cdev->dev, 517 "FORMAT 1 - Index missing\n"); 518 break; 519 case 0x04: 520 dev_warn(&device->cdev->dev, 521 "FORMAT 1 - Interruption cannot be " 522 "reset\n"); 523 break; 524 case 0x05: 525 dev_warn(&device->cdev->dev, 526 "FORMAT 1 - Device did not respond to " 527 "selection\n"); 528 break; 529 case 0x06: 530 dev_warn(&device->cdev->dev, 531 "FORMAT 1 - Device check-2 error or Set " 532 "Sector is not complete\n"); 533 break; 534 case 0x07: 535 dev_warn(&device->cdev->dev, 536 "FORMAT 1 - Head address does not " 537 "compare\n"); 538 break; 539 case 0x08: 540 dev_warn(&device->cdev->dev, 541 "FORMAT 1 - Device status 1 not valid\n"); 542 break; 543 case 0x09: 544 dev_warn(&device->cdev->dev, 545 "FORMAT 1 - Device not ready\n"); 546 break; 547 case 0x0A: 548 dev_warn(&device->cdev->dev, 549 "FORMAT 1 - Track physical address did " 550 "not compare\n"); 551 break; 552 case 0x0B: 553 dev_warn(&device->cdev->dev, 554 "FORMAT 1 - Missing device address bit\n"); 555 break; 556 case 0x0C: 557 dev_warn(&device->cdev->dev, 558 "FORMAT 1 - Drive motor switch is off\n"); 559 break; 560 case 0x0D: 561 dev_warn(&device->cdev->dev, 562 "FORMAT 1 - Seek incomplete\n"); 563 break; 564 case 0x0E: 565 dev_warn(&device->cdev->dev, 566 "FORMAT 1 - Cylinder address did not " 567 "compare\n"); 568 break; 569 case 0x0F: 570 dev_warn(&device->cdev->dev, 571 "FORMAT 1 - Offset active cannot be " 572 "reset\n"); 573 break; 574 default: 575 dev_warn(&device->cdev->dev, 576 "FORMAT 1 - Reserved\n"); 577 } 578 break; 579 580 case 0x20: /* Format 2 - 3990 Equipment Checks */ 581 switch (msg_no) { 582 case 0x08: 583 dev_warn(&device->cdev->dev, 584 "FORMAT 2 - 3990 check-2 error\n"); 585 break; 586 case 0x0E: 587 dev_warn(&device->cdev->dev, 588 "FORMAT 2 - Support facility errors\n"); 589 break; 590 case 0x0F: 591 dev_warn(&device->cdev->dev, 592 "FORMAT 2 - Microcode detected error " 593 "%02x\n", 594 sense[8]); 595 break; 596 default: 597 dev_warn(&device->cdev->dev, 598 "FORMAT 2 - Reserved\n"); 599 } 600 break; 601 602 case 0x30: /* Format 3 - 3990 Control Checks */ 603 switch (msg_no) { 604 case 0x0F: 605 dev_warn(&device->cdev->dev, 606 "FORMAT 3 - Allegiance terminated\n"); 607 break; 608 default: 609 dev_warn(&device->cdev->dev, 610 "FORMAT 3 - Reserved\n"); 611 } 612 break; 613 614 case 0x40: /* Format 4 - Data Checks */ 615 switch (msg_no) { 616 case 0x00: 617 dev_warn(&device->cdev->dev, 618 "FORMAT 4 - Home address area error\n"); 619 break; 620 case 0x01: 621 dev_warn(&device->cdev->dev, 622 "FORMAT 4 - Count area error\n"); 623 break; 624 case 0x02: 625 dev_warn(&device->cdev->dev, 626 "FORMAT 4 - Key area error\n"); 627 break; 628 case 0x03: 629 dev_warn(&device->cdev->dev, 630 "FORMAT 4 - Data area error\n"); 631 break; 632 case 0x04: 633 dev_warn(&device->cdev->dev, 634 "FORMAT 4 - No sync byte in home address " 635 "area\n"); 636 break; 637 case 0x05: 638 dev_warn(&device->cdev->dev, 639 "FORMAT 4 - No sync byte in count address " 640 "area\n"); 641 break; 642 case 0x06: 643 dev_warn(&device->cdev->dev, 644 "FORMAT 4 - No sync byte in key area\n"); 645 break; 646 case 0x07: 647 dev_warn(&device->cdev->dev, 648 "FORMAT 4 - No sync byte in data area\n"); 649 break; 650 case 0x08: 651 dev_warn(&device->cdev->dev, 652 "FORMAT 4 - Home address area error; " 653 "offset active\n"); 654 break; 655 case 0x09: 656 dev_warn(&device->cdev->dev, 657 "FORMAT 4 - Count area error; offset " 658 "active\n"); 659 break; 660 case 0x0A: 661 dev_warn(&device->cdev->dev, 662 "FORMAT 4 - Key area error; offset " 663 "active\n"); 664 break; 665 case 0x0B: 666 dev_warn(&device->cdev->dev, 667 "FORMAT 4 - Data area error; " 668 "offset active\n"); 669 break; 670 case 0x0C: 671 dev_warn(&device->cdev->dev, 672 "FORMAT 4 - No sync byte in home " 673 "address area; offset active\n"); 674 break; 675 case 0x0D: 676 dev_warn(&device->cdev->dev, 677 "FORMAT 4 - No sync byte in count " 678 "address area; offset active\n"); 679 break; 680 case 0x0E: 681 dev_warn(&device->cdev->dev, 682 "FORMAT 4 - No sync byte in key area; " 683 "offset active\n"); 684 break; 685 case 0x0F: 686 dev_warn(&device->cdev->dev, 687 "FORMAT 4 - No sync byte in data area; " 688 "offset active\n"); 689 break; 690 default: 691 dev_warn(&device->cdev->dev, 692 "FORMAT 4 - Reserved\n"); 693 } 694 break; 695 696 case 0x50: /* Format 5 - Data Check with displacement information */ 697 switch (msg_no) { 698 case 0x00: 699 dev_warn(&device->cdev->dev, 700 "FORMAT 5 - Data Check in the " 701 "home address area\n"); 702 break; 703 case 0x01: 704 dev_warn(&device->cdev->dev, 705 "FORMAT 5 - Data Check in the count " 706 "area\n"); 707 break; 708 case 0x02: 709 dev_warn(&device->cdev->dev, 710 "FORMAT 5 - Data Check in the key area\n"); 711 break; 712 case 0x03: 713 dev_warn(&device->cdev->dev, 714 "FORMAT 5 - Data Check in the data " 715 "area\n"); 716 break; 717 case 0x08: 718 dev_warn(&device->cdev->dev, 719 "FORMAT 5 - Data Check in the " 720 "home address area; offset active\n"); 721 break; 722 case 0x09: 723 dev_warn(&device->cdev->dev, 724 "FORMAT 5 - Data Check in the count area; " 725 "offset active\n"); 726 break; 727 case 0x0A: 728 dev_warn(&device->cdev->dev, 729 "FORMAT 5 - Data Check in the key area; " 730 "offset active\n"); 731 break; 732 case 0x0B: 733 dev_warn(&device->cdev->dev, 734 "FORMAT 5 - Data Check in the data area; " 735 "offset active\n"); 736 break; 737 default: 738 dev_warn(&device->cdev->dev, 739 "FORMAT 5 - Reserved\n"); 740 } 741 break; 742 743 case 0x60: /* Format 6 - Usage Statistics/Overrun Errors */ 744 switch (msg_no) { 745 case 0x00: 746 dev_warn(&device->cdev->dev, 747 "FORMAT 6 - Overrun on channel A\n"); 748 break; 749 case 0x01: 750 dev_warn(&device->cdev->dev, 751 "FORMAT 6 - Overrun on channel B\n"); 752 break; 753 case 0x02: 754 dev_warn(&device->cdev->dev, 755 "FORMAT 6 - Overrun on channel C\n"); 756 break; 757 case 0x03: 758 dev_warn(&device->cdev->dev, 759 "FORMAT 6 - Overrun on channel D\n"); 760 break; 761 case 0x04: 762 dev_warn(&device->cdev->dev, 763 "FORMAT 6 - Overrun on channel E\n"); 764 break; 765 case 0x05: 766 dev_warn(&device->cdev->dev, 767 "FORMAT 6 - Overrun on channel F\n"); 768 break; 769 case 0x06: 770 dev_warn(&device->cdev->dev, 771 "FORMAT 6 - Overrun on channel G\n"); 772 break; 773 case 0x07: 774 dev_warn(&device->cdev->dev, 775 "FORMAT 6 - Overrun on channel H\n"); 776 break; 777 default: 778 dev_warn(&device->cdev->dev, 779 "FORMAT 6 - Reserved\n"); 780 } 781 break; 782 783 case 0x70: /* Format 7 - Device Connection Control Checks */ 784 switch (msg_no) { 785 case 0x00: 786 dev_warn(&device->cdev->dev, 787 "FORMAT 7 - RCC initiated by a connection " 788 "check alert\n"); 789 break; 790 case 0x01: 791 dev_warn(&device->cdev->dev, 792 "FORMAT 7 - RCC 1 sequence not " 793 "successful\n"); 794 break; 795 case 0x02: 796 dev_warn(&device->cdev->dev, 797 "FORMAT 7 - RCC 1 and RCC 2 sequences not " 798 "successful\n"); 799 break; 800 case 0x03: 801 dev_warn(&device->cdev->dev, 802 "FORMAT 7 - Invalid tag-in during " 803 "selection sequence\n"); 804 break; 805 case 0x04: 806 dev_warn(&device->cdev->dev, 807 "FORMAT 7 - extra RCC required\n"); 808 break; 809 case 0x05: 810 dev_warn(&device->cdev->dev, 811 "FORMAT 7 - Invalid DCC selection " 812 "response or timeout\n"); 813 break; 814 case 0x06: 815 dev_warn(&device->cdev->dev, 816 "FORMAT 7 - Missing end operation; device " 817 "transfer complete\n"); 818 break; 819 case 0x07: 820 dev_warn(&device->cdev->dev, 821 "FORMAT 7 - Missing end operation; device " 822 "transfer incomplete\n"); 823 break; 824 case 0x08: 825 dev_warn(&device->cdev->dev, 826 "FORMAT 7 - Invalid tag-in for an " 827 "immediate command sequence\n"); 828 break; 829 case 0x09: 830 dev_warn(&device->cdev->dev, 831 "FORMAT 7 - Invalid tag-in for an " 832 "extended command sequence\n"); 833 break; 834 case 0x0A: 835 dev_warn(&device->cdev->dev, 836 "FORMAT 7 - 3990 microcode time out when " 837 "stopping selection\n"); 838 break; 839 case 0x0B: 840 dev_warn(&device->cdev->dev, 841 "FORMAT 7 - No response to selection " 842 "after a poll interruption\n"); 843 break; 844 case 0x0C: 845 dev_warn(&device->cdev->dev, 846 "FORMAT 7 - Permanent path error (DASD " 847 "controller not available)\n"); 848 break; 849 case 0x0D: 850 dev_warn(&device->cdev->dev, 851 "FORMAT 7 - DASD controller not available" 852 " on disconnected command chain\n"); 853 break; 854 default: 855 dev_warn(&device->cdev->dev, 856 "FORMAT 7 - Reserved\n"); 857 } 858 break; 859 860 case 0x80: /* Format 8 - Additional Device Equipment Checks */ 861 switch (msg_no) { 862 case 0x00: /* No Message */ 863 case 0x01: 864 dev_warn(&device->cdev->dev, 865 "FORMAT 8 - Error correction code " 866 "hardware fault\n"); 867 break; 868 case 0x03: 869 dev_warn(&device->cdev->dev, 870 "FORMAT 8 - Unexpected end operation " 871 "response code\n"); 872 break; 873 case 0x04: 874 dev_warn(&device->cdev->dev, 875 "FORMAT 8 - End operation with transfer " 876 "count not zero\n"); 877 break; 878 case 0x05: 879 dev_warn(&device->cdev->dev, 880 "FORMAT 8 - End operation with transfer " 881 "count zero\n"); 882 break; 883 case 0x06: 884 dev_warn(&device->cdev->dev, 885 "FORMAT 8 - DPS checks after a system " 886 "reset or selective reset\n"); 887 break; 888 case 0x07: 889 dev_warn(&device->cdev->dev, 890 "FORMAT 8 - DPS cannot be filled\n"); 891 break; 892 case 0x08: 893 dev_warn(&device->cdev->dev, 894 "FORMAT 8 - Short busy time-out during " 895 "device selection\n"); 896 break; 897 case 0x09: 898 dev_warn(&device->cdev->dev, 899 "FORMAT 8 - DASD controller failed to " 900 "set or reset the long busy latch\n"); 901 break; 902 case 0x0A: 903 dev_warn(&device->cdev->dev, 904 "FORMAT 8 - No interruption from device " 905 "during a command chain\n"); 906 break; 907 default: 908 dev_warn(&device->cdev->dev, 909 "FORMAT 8 - Reserved\n"); 910 } 911 break; 912 913 case 0x90: /* Format 9 - Device Read, Write, and Seek Checks */ 914 switch (msg_no) { 915 case 0x00: 916 break; /* No Message */ 917 case 0x06: 918 dev_warn(&device->cdev->dev, 919 "FORMAT 9 - Device check-2 error\n"); 920 break; 921 case 0x07: 922 dev_warn(&device->cdev->dev, 923 "FORMAT 9 - Head address did not " 924 "compare\n"); 925 break; 926 case 0x0A: 927 dev_warn(&device->cdev->dev, 928 "FORMAT 9 - Track physical address did " 929 "not compare while oriented\n"); 930 break; 931 case 0x0E: 932 dev_warn(&device->cdev->dev, 933 "FORMAT 9 - Cylinder address did not " 934 "compare\n"); 935 break; 936 default: 937 dev_warn(&device->cdev->dev, 938 "FORMAT 9 - Reserved\n"); 939 } 940 break; 941 942 case 0xF0: /* Format F - Cache Storage Checks */ 943 switch (msg_no) { 944 case 0x00: 945 dev_warn(&device->cdev->dev, 946 "FORMAT F - Operation Terminated\n"); 947 break; 948 case 0x01: 949 dev_warn(&device->cdev->dev, 950 "FORMAT F - Subsystem Processing Error\n"); 951 break; 952 case 0x02: 953 dev_warn(&device->cdev->dev, 954 "FORMAT F - Cache or nonvolatile storage " 955 "equipment failure\n"); 956 break; 957 case 0x04: 958 dev_warn(&device->cdev->dev, 959 "FORMAT F - Caching terminated\n"); 960 break; 961 case 0x06: 962 dev_warn(&device->cdev->dev, 963 "FORMAT F - Cache fast write access not " 964 "authorized\n"); 965 break; 966 case 0x07: 967 dev_warn(&device->cdev->dev, 968 "FORMAT F - Track format incorrect\n"); 969 break; 970 case 0x09: 971 dev_warn(&device->cdev->dev, 972 "FORMAT F - Caching reinitiated\n"); 973 break; 974 case 0x0A: 975 dev_warn(&device->cdev->dev, 976 "FORMAT F - Nonvolatile storage " 977 "terminated\n"); 978 break; 979 case 0x0B: 980 dev_warn(&device->cdev->dev, 981 "FORMAT F - Volume is suspended duplex\n"); 982 /* call extended error reporting (EER) */ 983 dasd_eer_write(device, erp->refers, 984 DASD_EER_PPRCSUSPEND); 985 break; 986 case 0x0C: 987 dev_warn(&device->cdev->dev, 988 "FORMAT F - Subsystem status cannot be " 989 "determined\n"); 990 break; 991 case 0x0D: 992 dev_warn(&device->cdev->dev, 993 "FORMAT F - Caching status reset to " 994 "default\n"); 995 break; 996 case 0x0E: 997 dev_warn(&device->cdev->dev, 998 "FORMAT F - DASD Fast Write inhibited\n"); 999 break; 1000 default: 1001 dev_warn(&device->cdev->dev, 1002 "FORMAT F - Reserved\n"); 1003 } 1004 break; 1005 1006 default: /* unknown message format - should not happen 1007 internal error 03 - unknown message format */ 1008 snprintf(errorstring, ERRORLENGTH, "03 %x02", msg_format); 1009 dev_err(&device->cdev->dev, 1010 "An error occurred in the DASD device driver, " 1011 "reason=%s\n", errorstring); 1012 break; 1013 } /* end switch message format */ 1014 1015 } /* end dasd_3990_handle_env_data */ 1016 1017 /* 1018 * DASD_3990_ERP_COM_REJ 1019 * 1020 * DESCRIPTION 1021 * Handles 24 byte 'Command Reject' error. 1022 * 1023 * PARAMETER 1024 * erp current erp_head 1025 * sense current sense data 1026 * 1027 * RETURN VALUES 1028 * erp 'new' erp_head - pointer to new ERP 1029 */ 1030 static struct dasd_ccw_req * 1031 dasd_3990_erp_com_rej(struct dasd_ccw_req * erp, char *sense) 1032 { 1033 1034 struct dasd_device *device = erp->startdev; 1035 1036 erp->function = dasd_3990_erp_com_rej; 1037 1038 /* env data present (ACTION 10 - retry should work) */ 1039 if (sense[2] & SNS2_ENV_DATA_PRESENT) { 1040 1041 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1042 "Command Reject - environmental data present"); 1043 1044 dasd_3990_handle_env_data(erp, sense); 1045 1046 erp->retries = 5; 1047 1048 } else if (sense[1] & SNS1_WRITE_INHIBITED) { 1049 dev_err(&device->cdev->dev, "An I/O request was rejected" 1050 " because writing is inhibited\n"); 1051 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 1052 } else { 1053 /* fatal error - set status to FAILED 1054 internal error 09 - Command Reject */ 1055 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1056 "device driver, reason=%s\n", "09"); 1057 1058 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 1059 } 1060 1061 return erp; 1062 1063 } /* end dasd_3990_erp_com_rej */ 1064 1065 /* 1066 * DASD_3990_ERP_BUS_OUT 1067 * 1068 * DESCRIPTION 1069 * Handles 24 byte 'Bus Out Parity Check' error. 1070 * 1071 * PARAMETER 1072 * erp current erp_head 1073 * RETURN VALUES 1074 * erp new erp_head - pointer to new ERP 1075 */ 1076 static struct dasd_ccw_req * 1077 dasd_3990_erp_bus_out(struct dasd_ccw_req * erp) 1078 { 1079 1080 struct dasd_device *device = erp->startdev; 1081 1082 /* first time set initial retry counter and erp_function */ 1083 /* and retry once without blocking queue */ 1084 /* (this enables easier enqueing of the cqr) */ 1085 if (erp->function != dasd_3990_erp_bus_out) { 1086 erp->retries = 256; 1087 erp->function = dasd_3990_erp_bus_out; 1088 1089 } else { 1090 1091 /* issue a message and wait for 'device ready' interrupt */ 1092 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1093 "bus out parity error or BOPC requested by " 1094 "channel"); 1095 1096 dasd_3990_erp_block_queue(erp, 60*HZ); 1097 1098 } 1099 1100 return erp; 1101 1102 } /* end dasd_3990_erp_bus_out */ 1103 1104 /* 1105 * DASD_3990_ERP_EQUIP_CHECK 1106 * 1107 * DESCRIPTION 1108 * Handles 24 byte 'Equipment Check' error. 1109 * 1110 * PARAMETER 1111 * erp current erp_head 1112 * RETURN VALUES 1113 * erp new erp_head - pointer to new ERP 1114 */ 1115 static struct dasd_ccw_req * 1116 dasd_3990_erp_equip_check(struct dasd_ccw_req * erp, char *sense) 1117 { 1118 1119 struct dasd_device *device = erp->startdev; 1120 1121 erp->function = dasd_3990_erp_equip_check; 1122 1123 if (sense[1] & SNS1_WRITE_INHIBITED) { 1124 dev_info(&device->cdev->dev, 1125 "Write inhibited path encountered\n"); 1126 1127 /* vary path offline 1128 internal error 04 - Path should be varied off-line.*/ 1129 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1130 "device driver, reason=%s\n", "04"); 1131 1132 erp = dasd_3990_erp_action_1(erp); 1133 1134 } else if (sense[2] & SNS2_ENV_DATA_PRESENT) { 1135 1136 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1137 "Equipment Check - " "environmental data present"); 1138 1139 dasd_3990_handle_env_data(erp, sense); 1140 1141 erp = dasd_3990_erp_action_4(erp, sense); 1142 1143 } else if (sense[1] & SNS1_PERM_ERR) { 1144 1145 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1146 "Equipment Check - retry exhausted or " 1147 "undesirable"); 1148 1149 erp = dasd_3990_erp_action_1(erp); 1150 1151 } else { 1152 /* all other equipment checks - Action 5 */ 1153 /* rest is done when retries == 0 */ 1154 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1155 "Equipment check or processing error"); 1156 1157 erp = dasd_3990_erp_action_5(erp); 1158 } 1159 return erp; 1160 1161 } /* end dasd_3990_erp_equip_check */ 1162 1163 /* 1164 * DASD_3990_ERP_DATA_CHECK 1165 * 1166 * DESCRIPTION 1167 * Handles 24 byte 'Data Check' error. 1168 * 1169 * PARAMETER 1170 * erp current erp_head 1171 * RETURN VALUES 1172 * erp new erp_head - pointer to new ERP 1173 */ 1174 static struct dasd_ccw_req * 1175 dasd_3990_erp_data_check(struct dasd_ccw_req * erp, char *sense) 1176 { 1177 1178 struct dasd_device *device = erp->startdev; 1179 1180 erp->function = dasd_3990_erp_data_check; 1181 1182 if (sense[2] & SNS2_CORRECTABLE) { /* correctable data check */ 1183 1184 /* issue message that the data has been corrected */ 1185 dev_emerg(&device->cdev->dev, 1186 "Data recovered during retry with PCI " 1187 "fetch mode active\n"); 1188 1189 /* not possible to handle this situation in Linux */ 1190 panic("No way to inform application about the possibly " 1191 "incorrect data"); 1192 1193 } else if (sense[2] & SNS2_ENV_DATA_PRESENT) { 1194 1195 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1196 "Uncorrectable data check recovered secondary " 1197 "addr of duplex pair"); 1198 1199 erp = dasd_3990_erp_action_4(erp, sense); 1200 1201 } else if (sense[1] & SNS1_PERM_ERR) { 1202 1203 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1204 "Uncorrectable data check with internal " 1205 "retry exhausted"); 1206 1207 erp = dasd_3990_erp_action_1(erp); 1208 1209 } else { 1210 /* all other data checks */ 1211 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1212 "Uncorrectable data check with retry count " 1213 "exhausted..."); 1214 1215 erp = dasd_3990_erp_action_5(erp); 1216 } 1217 1218 return erp; 1219 1220 } /* end dasd_3990_erp_data_check */ 1221 1222 /* 1223 * DASD_3990_ERP_OVERRUN 1224 * 1225 * DESCRIPTION 1226 * Handles 24 byte 'Overrun' error. 1227 * 1228 * PARAMETER 1229 * erp current erp_head 1230 * RETURN VALUES 1231 * erp new erp_head - pointer to new ERP 1232 */ 1233 static struct dasd_ccw_req * 1234 dasd_3990_erp_overrun(struct dasd_ccw_req * erp, char *sense) 1235 { 1236 1237 struct dasd_device *device = erp->startdev; 1238 1239 erp->function = dasd_3990_erp_overrun; 1240 1241 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1242 "Overrun - service overrun or overrun" 1243 " error requested by channel"); 1244 1245 erp = dasd_3990_erp_action_5(erp); 1246 1247 return erp; 1248 1249 } /* end dasd_3990_erp_overrun */ 1250 1251 /* 1252 * DASD_3990_ERP_INV_FORMAT 1253 * 1254 * DESCRIPTION 1255 * Handles 24 byte 'Invalid Track Format' error. 1256 * 1257 * PARAMETER 1258 * erp current erp_head 1259 * RETURN VALUES 1260 * erp new erp_head - pointer to new ERP 1261 */ 1262 static struct dasd_ccw_req * 1263 dasd_3990_erp_inv_format(struct dasd_ccw_req * erp, char *sense) 1264 { 1265 1266 struct dasd_device *device = erp->startdev; 1267 1268 erp->function = dasd_3990_erp_inv_format; 1269 1270 if (sense[2] & SNS2_ENV_DATA_PRESENT) { 1271 1272 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1273 "Track format error when destaging or " 1274 "staging data"); 1275 1276 dasd_3990_handle_env_data(erp, sense); 1277 1278 erp = dasd_3990_erp_action_4(erp, sense); 1279 1280 } else { 1281 /* internal error 06 - The track format is not valid*/ 1282 dev_err(&device->cdev->dev, 1283 "An error occurred in the DASD device driver, " 1284 "reason=%s\n", "06"); 1285 1286 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 1287 } 1288 1289 return erp; 1290 1291 } /* end dasd_3990_erp_inv_format */ 1292 1293 /* 1294 * DASD_3990_ERP_EOC 1295 * 1296 * DESCRIPTION 1297 * Handles 24 byte 'End-of-Cylinder' error. 1298 * 1299 * PARAMETER 1300 * erp already added default erp 1301 * RETURN VALUES 1302 * erp pointer to original (failed) cqr. 1303 */ 1304 static struct dasd_ccw_req * 1305 dasd_3990_erp_EOC(struct dasd_ccw_req * default_erp, char *sense) 1306 { 1307 1308 struct dasd_device *device = default_erp->startdev; 1309 1310 dev_err(&device->cdev->dev, 1311 "The cylinder data for accessing the DASD is inconsistent\n"); 1312 1313 /* implement action 7 - BUG */ 1314 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); 1315 1316 } /* end dasd_3990_erp_EOC */ 1317 1318 /* 1319 * DASD_3990_ERP_ENV_DATA 1320 * 1321 * DESCRIPTION 1322 * Handles 24 byte 'Environmental-Data Present' error. 1323 * 1324 * PARAMETER 1325 * erp current erp_head 1326 * RETURN VALUES 1327 * erp new erp_head - pointer to new ERP 1328 */ 1329 static struct dasd_ccw_req * 1330 dasd_3990_erp_env_data(struct dasd_ccw_req * erp, char *sense) 1331 { 1332 1333 struct dasd_device *device = erp->startdev; 1334 1335 erp->function = dasd_3990_erp_env_data; 1336 1337 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Environmental data present"); 1338 1339 dasd_3990_handle_env_data(erp, sense); 1340 1341 /* don't retry on disabled interface */ 1342 if (sense[7] != 0x0F) { 1343 erp = dasd_3990_erp_action_4(erp, sense); 1344 } else { 1345 erp->status = DASD_CQR_FILLED; 1346 } 1347 1348 return erp; 1349 1350 } /* end dasd_3990_erp_env_data */ 1351 1352 /* 1353 * DASD_3990_ERP_NO_REC 1354 * 1355 * DESCRIPTION 1356 * Handles 24 byte 'No Record Found' error. 1357 * 1358 * PARAMETER 1359 * erp already added default ERP 1360 * 1361 * RETURN VALUES 1362 * erp new erp_head - pointer to new ERP 1363 */ 1364 static struct dasd_ccw_req * 1365 dasd_3990_erp_no_rec(struct dasd_ccw_req * default_erp, char *sense) 1366 { 1367 1368 struct dasd_device *device = default_erp->startdev; 1369 1370 /* 1371 * In some cases the 'No Record Found' error might be expected and 1372 * log messages shouldn't be written then. 1373 * Check if the according suppress bit is set. 1374 */ 1375 if (!test_bit(DASD_CQR_SUPPRESS_NRF, &default_erp->flags)) 1376 dev_err(&device->cdev->dev, 1377 "The specified record was not found\n"); 1378 1379 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); 1380 1381 } /* end dasd_3990_erp_no_rec */ 1382 1383 /* 1384 * DASD_3990_ERP_FILE_PROT 1385 * 1386 * DESCRIPTION 1387 * Handles 24 byte 'File Protected' error. 1388 * Note: Seek related recovery is not implemented because 1389 * wee don't use the seek command yet. 1390 * 1391 * PARAMETER 1392 * erp current erp_head 1393 * RETURN VALUES 1394 * erp new erp_head - pointer to new ERP 1395 */ 1396 static struct dasd_ccw_req * 1397 dasd_3990_erp_file_prot(struct dasd_ccw_req * erp) 1398 { 1399 1400 struct dasd_device *device = erp->startdev; 1401 1402 /* 1403 * In some cases the 'File Protected' error might be expected and 1404 * log messages shouldn't be written then. 1405 * Check if the according suppress bit is set. 1406 */ 1407 if (!test_bit(DASD_CQR_SUPPRESS_FP, &erp->flags)) 1408 dev_err(&device->cdev->dev, 1409 "Accessing the DASD failed because of a hardware error\n"); 1410 1411 return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 1412 1413 } /* end dasd_3990_erp_file_prot */ 1414 1415 /* 1416 * DASD_3990_ERP_INSPECT_ALIAS 1417 * 1418 * DESCRIPTION 1419 * Checks if the original request was started on an alias device. 1420 * If yes, it modifies the original and the erp request so that 1421 * the erp request can be started on a base device. 1422 * 1423 * PARAMETER 1424 * erp pointer to the currently created default ERP 1425 * 1426 * RETURN VALUES 1427 * erp pointer to the modified ERP, or NULL 1428 */ 1429 1430 static struct dasd_ccw_req *dasd_3990_erp_inspect_alias( 1431 struct dasd_ccw_req *erp) 1432 { 1433 struct dasd_ccw_req *cqr = erp->refers; 1434 char *sense; 1435 1436 if (cqr->block && 1437 (cqr->block->base != cqr->startdev)) { 1438 1439 sense = dasd_get_sense(&erp->refers->irb); 1440 /* 1441 * dynamic pav may have changed base alias mapping 1442 */ 1443 if (!test_bit(DASD_FLAG_OFFLINE, &cqr->startdev->flags) && sense 1444 && (sense[0] == 0x10) && (sense[7] == 0x0F) 1445 && (sense[8] == 0x67)) { 1446 /* 1447 * remove device from alias handling to prevent new 1448 * requests from being scheduled on the 1449 * wrong alias device 1450 */ 1451 dasd_alias_remove_device(cqr->startdev); 1452 1453 /* schedule worker to reload device */ 1454 dasd_reload_device(cqr->startdev); 1455 } 1456 1457 if (cqr->startdev->features & DASD_FEATURE_ERPLOG) { 1458 DBF_DEV_EVENT(DBF_ERR, cqr->startdev, 1459 "ERP on alias device for request %p," 1460 " recover on base device %s", cqr, 1461 dev_name(&cqr->block->base->cdev->dev)); 1462 } 1463 dasd_eckd_reset_ccw_to_base_io(cqr); 1464 erp->startdev = cqr->block->base; 1465 erp->function = dasd_3990_erp_inspect_alias; 1466 return erp; 1467 } else 1468 return NULL; 1469 } 1470 1471 1472 /* 1473 * DASD_3990_ERP_INSPECT_24 1474 * 1475 * DESCRIPTION 1476 * Does a detailed inspection of the 24 byte sense data 1477 * and sets up a related error recovery action. 1478 * 1479 * PARAMETER 1480 * sense sense data of the actual error 1481 * erp pointer to the currently created default ERP 1482 * 1483 * RETURN VALUES 1484 * erp pointer to the (addtitional) ERP 1485 */ 1486 static struct dasd_ccw_req * 1487 dasd_3990_erp_inspect_24(struct dasd_ccw_req * erp, char *sense) 1488 { 1489 1490 struct dasd_ccw_req *erp_filled = NULL; 1491 1492 /* Check sense for .... */ 1493 /* 'Command Reject' */ 1494 if ((erp_filled == NULL) && (sense[0] & SNS0_CMD_REJECT)) { 1495 erp_filled = dasd_3990_erp_com_rej(erp, sense); 1496 } 1497 /* 'Intervention Required' */ 1498 if ((erp_filled == NULL) && (sense[0] & SNS0_INTERVENTION_REQ)) { 1499 erp_filled = dasd_3990_erp_int_req(erp); 1500 } 1501 /* 'Bus Out Parity Check' */ 1502 if ((erp_filled == NULL) && (sense[0] & SNS0_BUS_OUT_CHECK)) { 1503 erp_filled = dasd_3990_erp_bus_out(erp); 1504 } 1505 /* 'Equipment Check' */ 1506 if ((erp_filled == NULL) && (sense[0] & SNS0_EQUIPMENT_CHECK)) { 1507 erp_filled = dasd_3990_erp_equip_check(erp, sense); 1508 } 1509 /* 'Data Check' */ 1510 if ((erp_filled == NULL) && (sense[0] & SNS0_DATA_CHECK)) { 1511 erp_filled = dasd_3990_erp_data_check(erp, sense); 1512 } 1513 /* 'Overrun' */ 1514 if ((erp_filled == NULL) && (sense[0] & SNS0_OVERRUN)) { 1515 erp_filled = dasd_3990_erp_overrun(erp, sense); 1516 } 1517 /* 'Invalid Track Format' */ 1518 if ((erp_filled == NULL) && (sense[1] & SNS1_INV_TRACK_FORMAT)) { 1519 erp_filled = dasd_3990_erp_inv_format(erp, sense); 1520 } 1521 /* 'End-of-Cylinder' */ 1522 if ((erp_filled == NULL) && (sense[1] & SNS1_EOC)) { 1523 erp_filled = dasd_3990_erp_EOC(erp, sense); 1524 } 1525 /* 'Environmental Data' */ 1526 if ((erp_filled == NULL) && (sense[2] & SNS2_ENV_DATA_PRESENT)) { 1527 erp_filled = dasd_3990_erp_env_data(erp, sense); 1528 } 1529 /* 'No Record Found' */ 1530 if ((erp_filled == NULL) && (sense[1] & SNS1_NO_REC_FOUND)) { 1531 erp_filled = dasd_3990_erp_no_rec(erp, sense); 1532 } 1533 /* 'File Protected' */ 1534 if ((erp_filled == NULL) && (sense[1] & SNS1_FILE_PROTECTED)) { 1535 erp_filled = dasd_3990_erp_file_prot(erp); 1536 } 1537 /* other (unknown) error - do default ERP */ 1538 if (erp_filled == NULL) { 1539 1540 erp_filled = erp; 1541 } 1542 1543 return erp_filled; 1544 1545 } /* END dasd_3990_erp_inspect_24 */ 1546 1547 /* 1548 ***************************************************************************** 1549 * 32 byte sense ERP functions (only) 1550 ***************************************************************************** 1551 */ 1552 1553 /* 1554 * DASD_3990_ERPACTION_10_32 1555 * 1556 * DESCRIPTION 1557 * Handles 32 byte 'Action 10' of Single Program Action Codes. 1558 * Just retry and if retry doesn't work, return with error. 1559 * 1560 * PARAMETER 1561 * erp current erp_head 1562 * sense current sense data 1563 * RETURN VALUES 1564 * erp modified erp_head 1565 */ 1566 static struct dasd_ccw_req * 1567 dasd_3990_erp_action_10_32(struct dasd_ccw_req * erp, char *sense) 1568 { 1569 1570 struct dasd_device *device = erp->startdev; 1571 1572 erp->retries = 256; 1573 erp->function = dasd_3990_erp_action_10_32; 1574 1575 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "Perform logging requested"); 1576 1577 return erp; 1578 1579 } /* end dasd_3990_erp_action_10_32 */ 1580 1581 /* 1582 * DASD_3990_ERP_ACTION_1B_32 1583 * 1584 * DESCRIPTION 1585 * Handles 32 byte 'Action 1B' of Single Program Action Codes. 1586 * A write operation could not be finished because of an unexpected 1587 * condition. 1588 * The already created 'default erp' is used to get the link to 1589 * the erp chain, but it can not be used for this recovery 1590 * action because it contains no DE/LO data space. 1591 * 1592 * PARAMETER 1593 * default_erp already added default erp. 1594 * sense current sense data 1595 * 1596 * RETURN VALUES 1597 * erp new erp or 1598 * default_erp in case of imprecise ending or error 1599 */ 1600 static struct dasd_ccw_req * 1601 dasd_3990_erp_action_1B_32(struct dasd_ccw_req * default_erp, char *sense) 1602 { 1603 1604 struct dasd_device *device = default_erp->startdev; 1605 __u32 cpa = 0; 1606 struct dasd_ccw_req *cqr; 1607 struct dasd_ccw_req *erp; 1608 struct DE_eckd_data *DE_data; 1609 struct PFX_eckd_data *PFX_data; 1610 char *LO_data; /* LO_eckd_data_t */ 1611 struct ccw1 *ccw, *oldccw; 1612 1613 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1614 "Write not finished because of unexpected condition"); 1615 1616 default_erp->function = dasd_3990_erp_action_1B_32; 1617 1618 /* determine the original cqr */ 1619 cqr = default_erp; 1620 1621 while (cqr->refers != NULL) { 1622 cqr = cqr->refers; 1623 } 1624 1625 if (scsw_is_tm(&cqr->irb.scsw)) { 1626 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1627 "32 bit sense, action 1B is not defined" 1628 " in transport mode - just retry"); 1629 return default_erp; 1630 } 1631 1632 /* for imprecise ending just do default erp */ 1633 if (sense[1] & 0x01) { 1634 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1635 "Imprecise ending is set - just retry"); 1636 1637 return default_erp; 1638 } 1639 1640 /* determine the address of the CCW to be restarted */ 1641 /* Imprecise ending is not set -> addr from IRB-SCSW */ 1642 cpa = default_erp->refers->irb.scsw.cmd.cpa; 1643 1644 if (cpa == 0) { 1645 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1646 "Unable to determine address of the CCW " 1647 "to be restarted"); 1648 1649 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); 1650 } 1651 1652 /* Build new ERP request including DE/LO */ 1653 erp = dasd_alloc_erp_request((char *) &cqr->magic, 1654 2 + 1,/* DE/LO + TIC */ 1655 sizeof(struct DE_eckd_data) + 1656 sizeof(struct LO_eckd_data), device); 1657 1658 if (IS_ERR(erp)) { 1659 /* internal error 01 - Unable to allocate ERP */ 1660 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1661 "device driver, reason=%s\n", "01"); 1662 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); 1663 } 1664 1665 /* use original DE */ 1666 DE_data = erp->data; 1667 oldccw = cqr->cpaddr; 1668 if (oldccw->cmd_code == DASD_ECKD_CCW_PFX) { 1669 PFX_data = cqr->data; 1670 memcpy(DE_data, &PFX_data->define_extent, 1671 sizeof(struct DE_eckd_data)); 1672 } else 1673 memcpy(DE_data, cqr->data, sizeof(struct DE_eckd_data)); 1674 1675 /* create LO */ 1676 LO_data = erp->data + sizeof(struct DE_eckd_data); 1677 1678 if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) { 1679 /* should not */ 1680 return dasd_3990_erp_cleanup(default_erp, DASD_CQR_FAILED); 1681 } 1682 1683 if ((sense[7] & 0x3F) == 0x01) { 1684 /* operation code is WRITE DATA -> data area orientation */ 1685 LO_data[0] = 0x81; 1686 1687 } else if ((sense[7] & 0x3F) == 0x03) { 1688 /* operation code is FORMAT WRITE -> index orientation */ 1689 LO_data[0] = 0xC3; 1690 1691 } else { 1692 LO_data[0] = sense[7]; /* operation */ 1693 } 1694 1695 LO_data[1] = sense[8]; /* auxiliary */ 1696 LO_data[2] = sense[9]; 1697 LO_data[3] = sense[3]; /* count */ 1698 LO_data[4] = sense[29]; /* seek_addr.cyl */ 1699 LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */ 1700 LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */ 1701 1702 memcpy(&(LO_data[8]), &(sense[11]), 8); 1703 1704 /* create DE ccw */ 1705 ccw = erp->cpaddr; 1706 memset(ccw, 0, sizeof(struct ccw1)); 1707 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT; 1708 ccw->flags = CCW_FLAG_CC; 1709 ccw->count = 16; 1710 ccw->cda = (__u32)(addr_t) DE_data; 1711 1712 /* create LO ccw */ 1713 ccw++; 1714 memset(ccw, 0, sizeof(struct ccw1)); 1715 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD; 1716 ccw->flags = CCW_FLAG_CC; 1717 ccw->count = 16; 1718 ccw->cda = (__u32)(addr_t) LO_data; 1719 1720 /* TIC to the failed ccw */ 1721 ccw++; 1722 ccw->cmd_code = CCW_CMD_TIC; 1723 ccw->cda = cpa; 1724 1725 /* fill erp related fields */ 1726 erp->flags = default_erp->flags; 1727 erp->function = dasd_3990_erp_action_1B_32; 1728 erp->refers = default_erp->refers; 1729 erp->startdev = device; 1730 erp->memdev = device; 1731 erp->magic = default_erp->magic; 1732 erp->expires = default_erp->expires; 1733 erp->retries = 256; 1734 erp->buildclk = get_tod_clock(); 1735 erp->status = DASD_CQR_FILLED; 1736 1737 /* remove the default erp */ 1738 dasd_free_erp_request(default_erp, device); 1739 1740 return erp; 1741 1742 } /* end dasd_3990_erp_action_1B_32 */ 1743 1744 /* 1745 * DASD_3990_UPDATE_1B 1746 * 1747 * DESCRIPTION 1748 * Handles the update to the 32 byte 'Action 1B' of Single Program 1749 * Action Codes in case the first action was not successful. 1750 * The already created 'previous_erp' is the currently not successful 1751 * ERP. 1752 * 1753 * PARAMETER 1754 * previous_erp already created previous erp. 1755 * sense current sense data 1756 * RETURN VALUES 1757 * erp modified erp 1758 */ 1759 static struct dasd_ccw_req * 1760 dasd_3990_update_1B(struct dasd_ccw_req * previous_erp, char *sense) 1761 { 1762 1763 struct dasd_device *device = previous_erp->startdev; 1764 __u32 cpa = 0; 1765 struct dasd_ccw_req *cqr; 1766 struct dasd_ccw_req *erp; 1767 char *LO_data; /* struct LO_eckd_data */ 1768 struct ccw1 *ccw; 1769 1770 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1771 "Write not finished because of unexpected condition" 1772 " - follow on"); 1773 1774 /* determine the original cqr */ 1775 cqr = previous_erp; 1776 1777 while (cqr->refers != NULL) { 1778 cqr = cqr->refers; 1779 } 1780 1781 if (scsw_is_tm(&cqr->irb.scsw)) { 1782 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1783 "32 bit sense, action 1B, update," 1784 " in transport mode - just retry"); 1785 return previous_erp; 1786 } 1787 1788 /* for imprecise ending just do default erp */ 1789 if (sense[1] & 0x01) { 1790 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 1791 "Imprecise ending is set - just retry"); 1792 1793 previous_erp->status = DASD_CQR_FILLED; 1794 1795 return previous_erp; 1796 } 1797 1798 /* determine the address of the CCW to be restarted */ 1799 /* Imprecise ending is not set -> addr from IRB-SCSW */ 1800 cpa = previous_erp->irb.scsw.cmd.cpa; 1801 1802 if (cpa == 0) { 1803 /* internal error 02 - 1804 Unable to determine address of the CCW to be restarted */ 1805 dev_err(&device->cdev->dev, "An error occurred in the DASD " 1806 "device driver, reason=%s\n", "02"); 1807 1808 previous_erp->status = DASD_CQR_FAILED; 1809 1810 return previous_erp; 1811 } 1812 1813 erp = previous_erp; 1814 1815 /* update the LO with the new returned sense data */ 1816 LO_data = erp->data + sizeof(struct DE_eckd_data); 1817 1818 if ((sense[3] == 0x01) && (LO_data[1] & 0x01)) { 1819 /* should not happen */ 1820 previous_erp->status = DASD_CQR_FAILED; 1821 1822 return previous_erp; 1823 } 1824 1825 if ((sense[7] & 0x3F) == 0x01) { 1826 /* operation code is WRITE DATA -> data area orientation */ 1827 LO_data[0] = 0x81; 1828 1829 } else if ((sense[7] & 0x3F) == 0x03) { 1830 /* operation code is FORMAT WRITE -> index orientation */ 1831 LO_data[0] = 0xC3; 1832 1833 } else { 1834 LO_data[0] = sense[7]; /* operation */ 1835 } 1836 1837 LO_data[1] = sense[8]; /* auxiliary */ 1838 LO_data[2] = sense[9]; 1839 LO_data[3] = sense[3]; /* count */ 1840 LO_data[4] = sense[29]; /* seek_addr.cyl */ 1841 LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */ 1842 LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */ 1843 1844 memcpy(&(LO_data[8]), &(sense[11]), 8); 1845 1846 /* TIC to the failed ccw */ 1847 ccw = erp->cpaddr; /* addr of DE ccw */ 1848 ccw++; /* addr of LE ccw */ 1849 ccw++; /* addr of TIC ccw */ 1850 ccw->cda = cpa; 1851 1852 erp->status = DASD_CQR_FILLED; 1853 1854 return erp; 1855 1856 } /* end dasd_3990_update_1B */ 1857 1858 /* 1859 * DASD_3990_ERP_COMPOUND_RETRY 1860 * 1861 * DESCRIPTION 1862 * Handles the compound ERP action retry code. 1863 * NOTE: At least one retry is done even if zero is specified 1864 * by the sense data. This makes enqueueing of the request 1865 * easier. 1866 * 1867 * PARAMETER 1868 * sense sense data of the actual error 1869 * erp pointer to the currently created ERP 1870 * 1871 * RETURN VALUES 1872 * erp modified ERP pointer 1873 * 1874 */ 1875 static void 1876 dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense) 1877 { 1878 1879 switch (sense[25] & 0x03) { 1880 case 0x00: /* no not retry */ 1881 erp->retries = 1; 1882 break; 1883 1884 case 0x01: /* retry 2 times */ 1885 erp->retries = 2; 1886 break; 1887 1888 case 0x02: /* retry 10 times */ 1889 erp->retries = 10; 1890 break; 1891 1892 case 0x03: /* retry 256 times */ 1893 erp->retries = 256; 1894 break; 1895 1896 default: 1897 BUG(); 1898 } 1899 1900 erp->function = dasd_3990_erp_compound_retry; 1901 1902 } /* end dasd_3990_erp_compound_retry */ 1903 1904 /* 1905 * DASD_3990_ERP_COMPOUND_PATH 1906 * 1907 * DESCRIPTION 1908 * Handles the compound ERP action for retry on alternate 1909 * channel path. 1910 * 1911 * PARAMETER 1912 * sense sense data of the actual error 1913 * erp pointer to the currently created ERP 1914 * 1915 * RETURN VALUES 1916 * erp modified ERP pointer 1917 * 1918 */ 1919 static void 1920 dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense) 1921 { 1922 if (sense[25] & DASD_SENSE_BIT_3) { 1923 dasd_3990_erp_alternate_path(erp); 1924 1925 if (erp->status == DASD_CQR_FAILED && 1926 !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) { 1927 /* reset the lpm and the status to be able to 1928 * try further actions. */ 1929 erp->lpm = dasd_path_get_opm(erp->startdev); 1930 erp->status = DASD_CQR_NEED_ERP; 1931 } 1932 } 1933 1934 erp->function = dasd_3990_erp_compound_path; 1935 1936 } /* end dasd_3990_erp_compound_path */ 1937 1938 /* 1939 * DASD_3990_ERP_COMPOUND_CODE 1940 * 1941 * DESCRIPTION 1942 * Handles the compound ERP action for retry code. 1943 * 1944 * PARAMETER 1945 * sense sense data of the actual error 1946 * erp pointer to the currently created ERP 1947 * 1948 * RETURN VALUES 1949 * erp NEW ERP pointer 1950 * 1951 */ 1952 static struct dasd_ccw_req * 1953 dasd_3990_erp_compound_code(struct dasd_ccw_req * erp, char *sense) 1954 { 1955 1956 if (sense[25] & DASD_SENSE_BIT_2) { 1957 1958 switch (sense[28]) { 1959 case 0x17: 1960 /* issue a Diagnostic Control command with an 1961 * Inhibit Write subcommand and controller modifier */ 1962 erp = dasd_3990_erp_DCTL(erp, 0x20); 1963 break; 1964 1965 case 0x25: 1966 /* wait for 5 seconds and retry again */ 1967 erp->retries = 1; 1968 1969 dasd_3990_erp_block_queue (erp, 5*HZ); 1970 break; 1971 1972 default: 1973 /* should not happen - continue */ 1974 break; 1975 } 1976 } 1977 1978 erp->function = dasd_3990_erp_compound_code; 1979 1980 return erp; 1981 1982 } /* end dasd_3990_erp_compound_code */ 1983 1984 /* 1985 * DASD_3990_ERP_COMPOUND_CONFIG 1986 * 1987 * DESCRIPTION 1988 * Handles the compound ERP action for configruation 1989 * dependent error. 1990 * Note: duplex handling is not implemented (yet). 1991 * 1992 * PARAMETER 1993 * sense sense data of the actual error 1994 * erp pointer to the currently created ERP 1995 * 1996 * RETURN VALUES 1997 * erp modified ERP pointer 1998 * 1999 */ 2000 static void 2001 dasd_3990_erp_compound_config(struct dasd_ccw_req * erp, char *sense) 2002 { 2003 2004 if ((sense[25] & DASD_SENSE_BIT_1) && (sense[26] & DASD_SENSE_BIT_2)) { 2005 2006 /* set to suspended duplex state then restart 2007 internal error 05 - Set device to suspended duplex state 2008 should be done */ 2009 struct dasd_device *device = erp->startdev; 2010 dev_err(&device->cdev->dev, 2011 "An error occurred in the DASD device driver, " 2012 "reason=%s\n", "05"); 2013 2014 } 2015 2016 erp->function = dasd_3990_erp_compound_config; 2017 2018 } /* end dasd_3990_erp_compound_config */ 2019 2020 /* 2021 * DASD_3990_ERP_COMPOUND 2022 * 2023 * DESCRIPTION 2024 * Does the further compound program action if 2025 * compound retry was not successful. 2026 * 2027 * PARAMETER 2028 * sense sense data of the actual error 2029 * erp pointer to the current (failed) ERP 2030 * 2031 * RETURN VALUES 2032 * erp (additional) ERP pointer 2033 * 2034 */ 2035 static struct dasd_ccw_req * 2036 dasd_3990_erp_compound(struct dasd_ccw_req * erp, char *sense) 2037 { 2038 2039 if ((erp->function == dasd_3990_erp_compound_retry) && 2040 (erp->status == DASD_CQR_NEED_ERP)) { 2041 2042 dasd_3990_erp_compound_path(erp, sense); 2043 } 2044 2045 if ((erp->function == dasd_3990_erp_compound_path) && 2046 (erp->status == DASD_CQR_NEED_ERP)) { 2047 2048 erp = dasd_3990_erp_compound_code(erp, sense); 2049 } 2050 2051 if ((erp->function == dasd_3990_erp_compound_code) && 2052 (erp->status == DASD_CQR_NEED_ERP)) { 2053 2054 dasd_3990_erp_compound_config(erp, sense); 2055 } 2056 2057 /* if no compound action ERP specified, the request failed */ 2058 if (erp->status == DASD_CQR_NEED_ERP) 2059 erp->status = DASD_CQR_FAILED; 2060 2061 return erp; 2062 2063 } /* end dasd_3990_erp_compound */ 2064 2065 /* 2066 *DASD_3990_ERP_HANDLE_SIM 2067 * 2068 *DESCRIPTION 2069 * inspects the SIM SENSE data and starts an appropriate action 2070 * 2071 * PARAMETER 2072 * sense sense data of the actual error 2073 * 2074 * RETURN VALUES 2075 * none 2076 */ 2077 void 2078 dasd_3990_erp_handle_sim(struct dasd_device *device, char *sense) 2079 { 2080 /* print message according to log or message to operator mode */ 2081 if ((sense[24] & DASD_SIM_MSG_TO_OP) || (sense[1] & 0x10)) { 2082 /* print SIM SRC from RefCode */ 2083 dev_err(&device->cdev->dev, "SIM - SRC: " 2084 "%02x%02x%02x%02x\n", sense[22], 2085 sense[23], sense[11], sense[12]); 2086 } else if (sense[24] & DASD_SIM_LOG) { 2087 /* print SIM SRC Refcode */ 2088 dev_warn(&device->cdev->dev, "log SIM - SRC: " 2089 "%02x%02x%02x%02x\n", sense[22], 2090 sense[23], sense[11], sense[12]); 2091 } 2092 } 2093 2094 /* 2095 * DASD_3990_ERP_INSPECT_32 2096 * 2097 * DESCRIPTION 2098 * Does a detailed inspection of the 32 byte sense data 2099 * and sets up a related error recovery action. 2100 * 2101 * PARAMETER 2102 * sense sense data of the actual error 2103 * erp pointer to the currently created default ERP 2104 * 2105 * RETURN VALUES 2106 * erp_filled pointer to the ERP 2107 * 2108 */ 2109 static struct dasd_ccw_req * 2110 dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense) 2111 { 2112 2113 struct dasd_device *device = erp->startdev; 2114 2115 erp->function = dasd_3990_erp_inspect_32; 2116 2117 /* check for SIM sense data */ 2118 if ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE) 2119 dasd_3990_erp_handle_sim(device, sense); 2120 2121 if (sense[25] & DASD_SENSE_BIT_0) { 2122 2123 /* compound program action codes (byte25 bit 0 == '1') */ 2124 dasd_3990_erp_compound_retry(erp, sense); 2125 2126 } else { 2127 2128 /* single program action codes (byte25 bit 0 == '0') */ 2129 switch (sense[25]) { 2130 2131 case 0x00: /* success - use default ERP for retries */ 2132 DBF_DEV_EVENT(DBF_DEBUG, device, "%s", 2133 "ERP called for successful request" 2134 " - just retry"); 2135 break; 2136 2137 case 0x01: /* fatal error */ 2138 dev_err(&device->cdev->dev, 2139 "ERP failed for the DASD\n"); 2140 2141 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 2142 break; 2143 2144 case 0x02: /* intervention required */ 2145 case 0x03: /* intervention required during dual copy */ 2146 erp = dasd_3990_erp_int_req(erp); 2147 break; 2148 2149 case 0x0F: /* length mismatch during update write command 2150 internal error 08 - update write command error*/ 2151 dev_err(&device->cdev->dev, "An error occurred in the " 2152 "DASD device driver, reason=%s\n", "08"); 2153 2154 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 2155 break; 2156 2157 case 0x10: /* logging required for other channel program */ 2158 erp = dasd_3990_erp_action_10_32(erp, sense); 2159 break; 2160 2161 case 0x15: /* next track outside defined extend 2162 internal error 07 - The next track is not 2163 within the defined storage extent */ 2164 dev_err(&device->cdev->dev, 2165 "An error occurred in the DASD device driver, " 2166 "reason=%s\n", "07"); 2167 2168 erp = dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED); 2169 break; 2170 2171 case 0x1B: /* unexpected condition during write */ 2172 2173 erp = dasd_3990_erp_action_1B_32(erp, sense); 2174 break; 2175 2176 case 0x1C: /* invalid data */ 2177 dev_emerg(&device->cdev->dev, 2178 "Data recovered during retry with PCI " 2179 "fetch mode active\n"); 2180 2181 /* not possible to handle this situation in Linux */ 2182 panic 2183 ("Invalid data - No way to inform application " 2184 "about the possibly incorrect data"); 2185 break; 2186 2187 case 0x1D: /* state-change pending */ 2188 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 2189 "A State change pending condition exists " 2190 "for the subsystem or device"); 2191 2192 erp = dasd_3990_erp_action_4(erp, sense); 2193 break; 2194 2195 case 0x1E: /* busy */ 2196 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 2197 "Busy condition exists " 2198 "for the subsystem or device"); 2199 erp = dasd_3990_erp_action_4(erp, sense); 2200 break; 2201 2202 default: /* all others errors - default erp */ 2203 break; 2204 } 2205 } 2206 2207 return erp; 2208 2209 } /* end dasd_3990_erp_inspect_32 */ 2210 2211 static void dasd_3990_erp_disable_path(struct dasd_device *device, __u8 lpum) 2212 { 2213 int pos = pathmask_to_pos(lpum); 2214 2215 /* no remaining path, cannot disable */ 2216 if (!(dasd_path_get_opm(device) & ~lpum)) 2217 return; 2218 2219 dev_err(&device->cdev->dev, 2220 "Path %x.%02x (pathmask %02x) is disabled - IFCC threshold exceeded\n", 2221 device->path[pos].cssid, device->path[pos].chpid, lpum); 2222 dasd_path_remove_opm(device, lpum); 2223 dasd_path_add_ifccpm(device, lpum); 2224 device->path[pos].errorclk = 0; 2225 atomic_set(&device->path[pos].error_count, 0); 2226 } 2227 2228 static void dasd_3990_erp_account_error(struct dasd_ccw_req *erp) 2229 { 2230 struct dasd_device *device = erp->startdev; 2231 __u8 lpum = erp->refers->irb.esw.esw1.lpum; 2232 int pos = pathmask_to_pos(lpum); 2233 unsigned long long clk; 2234 2235 if (!device->path_thrhld) 2236 return; 2237 2238 clk = get_tod_clock(); 2239 /* 2240 * check if the last error is longer ago than the timeout, 2241 * if so reset error state 2242 */ 2243 if ((tod_to_ns(clk - device->path[pos].errorclk) / NSEC_PER_SEC) 2244 >= device->path_interval) { 2245 atomic_set(&device->path[pos].error_count, 0); 2246 device->path[pos].errorclk = 0; 2247 } 2248 atomic_inc(&device->path[pos].error_count); 2249 device->path[pos].errorclk = clk; 2250 /* threshold exceeded disable path if possible */ 2251 if (atomic_read(&device->path[pos].error_count) >= 2252 device->path_thrhld) 2253 dasd_3990_erp_disable_path(device, lpum); 2254 } 2255 2256 /* 2257 ***************************************************************************** 2258 * main ERP control functions (24 and 32 byte sense) 2259 ***************************************************************************** 2260 */ 2261 2262 /* 2263 * DASD_3990_ERP_CONTROL_CHECK 2264 * 2265 * DESCRIPTION 2266 * Does a generic inspection if a control check occurred and sets up 2267 * the related error recovery procedure 2268 * 2269 * PARAMETER 2270 * erp pointer to the currently created default ERP 2271 * 2272 * RETURN VALUES 2273 * erp_filled pointer to the erp 2274 */ 2275 2276 static struct dasd_ccw_req * 2277 dasd_3990_erp_control_check(struct dasd_ccw_req *erp) 2278 { 2279 struct dasd_device *device = erp->startdev; 2280 2281 if (scsw_cstat(&erp->refers->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK 2282 | SCHN_STAT_CHN_CTRL_CHK)) { 2283 DBF_DEV_EVENT(DBF_WARNING, device, "%s", 2284 "channel or interface control check"); 2285 dasd_3990_erp_account_error(erp); 2286 erp = dasd_3990_erp_action_4(erp, NULL); 2287 } 2288 return erp; 2289 } 2290 2291 /* 2292 * DASD_3990_ERP_INSPECT 2293 * 2294 * DESCRIPTION 2295 * Does a detailed inspection for sense data by calling either 2296 * the 24-byte or the 32-byte inspection routine. 2297 * 2298 * PARAMETER 2299 * erp pointer to the currently created default ERP 2300 * RETURN VALUES 2301 * erp_new contens was possibly modified 2302 */ 2303 static struct dasd_ccw_req * 2304 dasd_3990_erp_inspect(struct dasd_ccw_req *erp) 2305 { 2306 2307 struct dasd_ccw_req *erp_new = NULL; 2308 char *sense; 2309 2310 /* if this problem occurred on an alias retry on base */ 2311 erp_new = dasd_3990_erp_inspect_alias(erp); 2312 if (erp_new) 2313 return erp_new; 2314 2315 /* sense data are located in the refers record of the 2316 * already set up new ERP ! 2317 * check if concurrent sens is available 2318 */ 2319 sense = dasd_get_sense(&erp->refers->irb); 2320 if (!sense) 2321 erp_new = dasd_3990_erp_control_check(erp); 2322 /* distinguish between 24 and 32 byte sense data */ 2323 else if (sense[27] & DASD_SENSE_BIT_0) { 2324 2325 /* inspect the 24 byte sense data */ 2326 erp_new = dasd_3990_erp_inspect_24(erp, sense); 2327 2328 } else { 2329 2330 /* inspect the 32 byte sense data */ 2331 erp_new = dasd_3990_erp_inspect_32(erp, sense); 2332 2333 } /* end distinguish between 24 and 32 byte sense data */ 2334 2335 return erp_new; 2336 } 2337 2338 /* 2339 * DASD_3990_ERP_ADD_ERP 2340 * 2341 * DESCRIPTION 2342 * This function adds an additional request block (ERP) to the head of 2343 * the given cqr (or erp). 2344 * For a command mode cqr the erp is initialized as an default erp 2345 * (retry TIC). 2346 * For transport mode we make a copy of the original TCW (points to 2347 * the original TCCB, TIDALs, etc.) but give it a fresh 2348 * TSB so the original sense data will not be changed. 2349 * 2350 * PARAMETER 2351 * cqr head of the current ERP-chain (or single cqr if 2352 * first error) 2353 * RETURN VALUES 2354 * erp pointer to new ERP-chain head 2355 */ 2356 static struct dasd_ccw_req *dasd_3990_erp_add_erp(struct dasd_ccw_req *cqr) 2357 { 2358 2359 struct dasd_device *device = cqr->startdev; 2360 struct ccw1 *ccw; 2361 struct dasd_ccw_req *erp; 2362 int cplength, datasize; 2363 struct tcw *tcw; 2364 struct tsb *tsb; 2365 2366 if (cqr->cpmode == 1) { 2367 cplength = 0; 2368 /* TCW needs to be 64 byte aligned, so leave enough room */ 2369 datasize = 64 + sizeof(struct tcw) + sizeof(struct tsb); 2370 } else { 2371 cplength = 2; 2372 datasize = 0; 2373 } 2374 2375 /* allocate additional request block */ 2376 erp = dasd_alloc_erp_request((char *) &cqr->magic, 2377 cplength, datasize, device); 2378 if (IS_ERR(erp)) { 2379 if (cqr->retries <= 0) { 2380 DBF_DEV_EVENT(DBF_ERR, device, "%s", 2381 "Unable to allocate ERP request"); 2382 cqr->status = DASD_CQR_FAILED; 2383 cqr->stopclk = get_tod_clock(); 2384 } else { 2385 DBF_DEV_EVENT(DBF_ERR, device, 2386 "Unable to allocate ERP request " 2387 "(%i retries left)", 2388 cqr->retries); 2389 dasd_block_set_timer(device->block, (HZ << 3)); 2390 } 2391 return erp; 2392 } 2393 2394 ccw = cqr->cpaddr; 2395 if (cqr->cpmode == 1) { 2396 /* make a shallow copy of the original tcw but set new tsb */ 2397 erp->cpmode = 1; 2398 erp->cpaddr = PTR_ALIGN(erp->data, 64); 2399 tcw = erp->cpaddr; 2400 tsb = (struct tsb *) &tcw[1]; 2401 *tcw = *((struct tcw *)cqr->cpaddr); 2402 tcw->tsb = (long)tsb; 2403 } else if (ccw->cmd_code == DASD_ECKD_CCW_PSF) { 2404 /* PSF cannot be chained from NOOP/TIC */ 2405 erp->cpaddr = cqr->cpaddr; 2406 } else { 2407 /* initialize request with default TIC to current ERP/CQR */ 2408 ccw = erp->cpaddr; 2409 ccw->cmd_code = CCW_CMD_NOOP; 2410 ccw->flags = CCW_FLAG_CC; 2411 ccw++; 2412 ccw->cmd_code = CCW_CMD_TIC; 2413 ccw->cda = (long)(cqr->cpaddr); 2414 } 2415 2416 erp->flags = cqr->flags; 2417 erp->function = dasd_3990_erp_add_erp; 2418 erp->refers = cqr; 2419 erp->startdev = device; 2420 erp->memdev = device; 2421 erp->block = cqr->block; 2422 erp->magic = cqr->magic; 2423 erp->expires = cqr->expires; 2424 erp->retries = 256; 2425 erp->buildclk = get_tod_clock(); 2426 erp->status = DASD_CQR_FILLED; 2427 2428 return erp; 2429 } 2430 2431 /* 2432 * DASD_3990_ERP_ADDITIONAL_ERP 2433 * 2434 * DESCRIPTION 2435 * An additional ERP is needed to handle the current error. 2436 * Add ERP to the head of the ERP-chain containing the ERP processing 2437 * determined based on the sense data. 2438 * 2439 * PARAMETER 2440 * cqr head of the current ERP-chain (or single cqr if 2441 * first error) 2442 * 2443 * RETURN VALUES 2444 * erp pointer to new ERP-chain head 2445 */ 2446 static struct dasd_ccw_req * 2447 dasd_3990_erp_additional_erp(struct dasd_ccw_req * cqr) 2448 { 2449 2450 struct dasd_ccw_req *erp = NULL; 2451 2452 /* add erp and initialize with default TIC */ 2453 erp = dasd_3990_erp_add_erp(cqr); 2454 2455 if (IS_ERR(erp)) 2456 return erp; 2457 2458 /* inspect sense, determine specific ERP if possible */ 2459 if (erp != cqr) { 2460 2461 erp = dasd_3990_erp_inspect(erp); 2462 } 2463 2464 return erp; 2465 2466 } /* end dasd_3990_erp_additional_erp */ 2467 2468 /* 2469 * DASD_3990_ERP_ERROR_MATCH 2470 * 2471 * DESCRIPTION 2472 * Check if the device status of the given cqr is the same. 2473 * This means that the failed CCW and the relevant sense data 2474 * must match. 2475 * I don't distinguish between 24 and 32 byte sense because in case of 2476 * 24 byte sense byte 25 and 27 is set as well. 2477 * 2478 * PARAMETER 2479 * cqr1 first cqr, which will be compared with the 2480 * cqr2 second cqr. 2481 * 2482 * RETURN VALUES 2483 * match 'boolean' for match found 2484 * returns 1 if match found, otherwise 0. 2485 */ 2486 static int dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1, 2487 struct dasd_ccw_req *cqr2) 2488 { 2489 char *sense1, *sense2; 2490 2491 if (cqr1->startdev != cqr2->startdev) 2492 return 0; 2493 2494 sense1 = dasd_get_sense(&cqr1->irb); 2495 sense2 = dasd_get_sense(&cqr2->irb); 2496 2497 /* one request has sense data, the other not -> no match, return 0 */ 2498 if (!sense1 != !sense2) 2499 return 0; 2500 /* no sense data in both cases -> check cstat for IFCC */ 2501 if (!sense1 && !sense2) { 2502 if ((scsw_cstat(&cqr1->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK | 2503 SCHN_STAT_CHN_CTRL_CHK)) == 2504 (scsw_cstat(&cqr2->irb.scsw) & (SCHN_STAT_INTF_CTRL_CHK | 2505 SCHN_STAT_CHN_CTRL_CHK))) 2506 return 1; /* match with ifcc*/ 2507 } 2508 /* check sense data; byte 0-2,25,27 */ 2509 if (!(sense1 && sense2 && 2510 (memcmp(sense1, sense2, 3) == 0) && 2511 (sense1[27] == sense2[27]) && 2512 (sense1[25] == sense2[25]))) { 2513 2514 return 0; /* sense doesn't match */ 2515 } 2516 2517 return 1; /* match */ 2518 2519 } /* end dasd_3990_erp_error_match */ 2520 2521 /* 2522 * DASD_3990_ERP_IN_ERP 2523 * 2524 * DESCRIPTION 2525 * check if the current error already happened before. 2526 * quick exit if current cqr is not an ERP (cqr->refers=NULL) 2527 * 2528 * PARAMETER 2529 * cqr failed cqr (either original cqr or already an erp) 2530 * 2531 * RETURN VALUES 2532 * erp erp-pointer to the already defined error 2533 * recovery procedure OR 2534 * NULL if a 'new' error occurred. 2535 */ 2536 static struct dasd_ccw_req * 2537 dasd_3990_erp_in_erp(struct dasd_ccw_req *cqr) 2538 { 2539 2540 struct dasd_ccw_req *erp_head = cqr, /* save erp chain head */ 2541 *erp_match = NULL; /* save erp chain head */ 2542 int match = 0; /* 'boolean' for matching error found */ 2543 2544 if (cqr->refers == NULL) { /* return if not in erp */ 2545 return NULL; 2546 } 2547 2548 /* check the erp/cqr chain for current error */ 2549 do { 2550 match = dasd_3990_erp_error_match(erp_head, cqr->refers); 2551 erp_match = cqr; /* save possible matching erp */ 2552 cqr = cqr->refers; /* check next erp/cqr in queue */ 2553 2554 } while ((cqr->refers != NULL) && (!match)); 2555 2556 if (!match) { 2557 return NULL; /* no match was found */ 2558 } 2559 2560 return erp_match; /* return address of matching erp */ 2561 2562 } /* END dasd_3990_erp_in_erp */ 2563 2564 /* 2565 * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense) 2566 * 2567 * DESCRIPTION 2568 * No retry is left for the current ERP. Check what has to be done 2569 * with the ERP. 2570 * - do further defined ERP action or 2571 * - wait for interrupt or 2572 * - exit with permanent error 2573 * 2574 * PARAMETER 2575 * erp ERP which is in progress with no retry left 2576 * 2577 * RETURN VALUES 2578 * erp modified/additional ERP 2579 */ 2580 static struct dasd_ccw_req * 2581 dasd_3990_erp_further_erp(struct dasd_ccw_req *erp) 2582 { 2583 2584 struct dasd_device *device = erp->startdev; 2585 char *sense = dasd_get_sense(&erp->irb); 2586 2587 /* check for 24 byte sense ERP */ 2588 if ((erp->function == dasd_3990_erp_bus_out) || 2589 (erp->function == dasd_3990_erp_action_1) || 2590 (erp->function == dasd_3990_erp_action_4)) { 2591 2592 erp = dasd_3990_erp_action_1(erp); 2593 2594 } else if (erp->function == dasd_3990_erp_action_1_sec) { 2595 erp = dasd_3990_erp_action_1_sec(erp); 2596 } else if (erp->function == dasd_3990_erp_action_5) { 2597 2598 /* retries have not been successful */ 2599 /* prepare erp for retry on different channel path */ 2600 erp = dasd_3990_erp_action_1(erp); 2601 2602 if (sense && !(sense[2] & DASD_SENSE_BIT_0)) { 2603 2604 /* issue a Diagnostic Control command with an 2605 * Inhibit Write subcommand */ 2606 2607 switch (sense[25]) { 2608 case 0x17: 2609 case 0x57:{ /* controller */ 2610 erp = dasd_3990_erp_DCTL(erp, 0x20); 2611 break; 2612 } 2613 case 0x18: 2614 case 0x58:{ /* channel path */ 2615 erp = dasd_3990_erp_DCTL(erp, 0x40); 2616 break; 2617 } 2618 case 0x19: 2619 case 0x59:{ /* storage director */ 2620 erp = dasd_3990_erp_DCTL(erp, 0x80); 2621 break; 2622 } 2623 default: 2624 DBF_DEV_EVENT(DBF_WARNING, device, 2625 "invalid subcommand modifier 0x%x " 2626 "for Diagnostic Control Command", 2627 sense[25]); 2628 } 2629 } 2630 2631 /* check for 32 byte sense ERP */ 2632 } else if (sense && 2633 ((erp->function == dasd_3990_erp_compound_retry) || 2634 (erp->function == dasd_3990_erp_compound_path) || 2635 (erp->function == dasd_3990_erp_compound_code) || 2636 (erp->function == dasd_3990_erp_compound_config))) { 2637 2638 erp = dasd_3990_erp_compound(erp, sense); 2639 2640 } else { 2641 /* 2642 * No retry left and no additional special handling 2643 * necessary 2644 */ 2645 dev_err(&device->cdev->dev, 2646 "ERP %p has run out of retries and failed\n", erp); 2647 2648 erp->status = DASD_CQR_FAILED; 2649 } 2650 2651 return erp; 2652 2653 } /* end dasd_3990_erp_further_erp */ 2654 2655 /* 2656 * DASD_3990_ERP_HANDLE_MATCH_ERP 2657 * 2658 * DESCRIPTION 2659 * An error occurred again and an ERP has been detected which is already 2660 * used to handle this error (e.g. retries). 2661 * All prior ERP's are asumed to be successful and therefore removed 2662 * from queue. 2663 * If retry counter of matching erp is already 0, it is checked if further 2664 * action is needed (besides retry) or if the ERP has failed. 2665 * 2666 * PARAMETER 2667 * erp_head first ERP in ERP-chain 2668 * erp ERP that handles the actual error. 2669 * (matching erp) 2670 * 2671 * RETURN VALUES 2672 * erp modified/additional ERP 2673 */ 2674 static struct dasd_ccw_req * 2675 dasd_3990_erp_handle_match_erp(struct dasd_ccw_req *erp_head, 2676 struct dasd_ccw_req *erp) 2677 { 2678 2679 struct dasd_device *device = erp_head->startdev; 2680 struct dasd_ccw_req *erp_done = erp_head; /* finished req */ 2681 struct dasd_ccw_req *erp_free = NULL; /* req to be freed */ 2682 2683 /* loop over successful ERPs and remove them from chanq */ 2684 while (erp_done != erp) { 2685 2686 if (erp_done == NULL) /* end of chain reached */ 2687 panic(PRINTK_HEADER "Programming error in ERP! The " 2688 "original request was lost\n"); 2689 2690 /* remove the request from the device queue */ 2691 list_del(&erp_done->blocklist); 2692 2693 erp_free = erp_done; 2694 erp_done = erp_done->refers; 2695 2696 /* free the finished erp request */ 2697 dasd_free_erp_request(erp_free, erp_free->memdev); 2698 2699 } /* end while */ 2700 2701 if (erp->retries > 0) { 2702 2703 char *sense = dasd_get_sense(&erp->refers->irb); 2704 2705 /* check for special retries */ 2706 if (sense && erp->function == dasd_3990_erp_action_4) { 2707 2708 erp = dasd_3990_erp_action_4(erp, sense); 2709 2710 } else if (sense && 2711 erp->function == dasd_3990_erp_action_1B_32) { 2712 2713 erp = dasd_3990_update_1B(erp, sense); 2714 2715 } else if (sense && erp->function == dasd_3990_erp_int_req) { 2716 2717 erp = dasd_3990_erp_int_req(erp); 2718 2719 } else { 2720 /* simple retry */ 2721 DBF_DEV_EVENT(DBF_DEBUG, device, 2722 "%i retries left for erp %p", 2723 erp->retries, erp); 2724 2725 /* handle the request again... */ 2726 erp->status = DASD_CQR_FILLED; 2727 } 2728 2729 } else { 2730 /* no retry left - check for further necessary action */ 2731 /* if no further actions, handle rest as permanent error */ 2732 erp = dasd_3990_erp_further_erp(erp); 2733 } 2734 2735 return erp; 2736 2737 } /* end dasd_3990_erp_handle_match_erp */ 2738 2739 /* 2740 * DASD_3990_ERP_ACTION 2741 * 2742 * DESCRIPTION 2743 * control routine for 3990 erp actions. 2744 * Has to be called with the queue lock (namely the s390_irq_lock) acquired. 2745 * 2746 * PARAMETER 2747 * cqr failed cqr (either original cqr or already an erp) 2748 * 2749 * RETURN VALUES 2750 * erp erp-pointer to the head of the ERP action chain. 2751 * This means: 2752 * - either a ptr to an additional ERP cqr or 2753 * - the original given cqr (which's status might 2754 * be modified) 2755 */ 2756 struct dasd_ccw_req * 2757 dasd_3990_erp_action(struct dasd_ccw_req * cqr) 2758 { 2759 struct dasd_ccw_req *erp = NULL; 2760 struct dasd_device *device = cqr->startdev; 2761 struct dasd_ccw_req *temp_erp = NULL; 2762 2763 if (device->features & DASD_FEATURE_ERPLOG) { 2764 /* print current erp_chain */ 2765 dev_err(&device->cdev->dev, 2766 "ERP chain at BEGINNING of ERP-ACTION\n"); 2767 for (temp_erp = cqr; 2768 temp_erp != NULL; temp_erp = temp_erp->refers) { 2769 2770 dev_err(&device->cdev->dev, 2771 "ERP %p (%02x) refers to %p\n", 2772 temp_erp, temp_erp->status, 2773 temp_erp->refers); 2774 } 2775 } 2776 2777 /* double-check if current erp/cqr was successful */ 2778 if ((scsw_cstat(&cqr->irb.scsw) == 0x00) && 2779 (scsw_dstat(&cqr->irb.scsw) == 2780 (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) { 2781 2782 DBF_DEV_EVENT(DBF_DEBUG, device, 2783 "ERP called for successful request %p" 2784 " - NO ERP necessary", cqr); 2785 2786 cqr->status = DASD_CQR_DONE; 2787 2788 return cqr; 2789 } 2790 2791 /* check if error happened before */ 2792 erp = dasd_3990_erp_in_erp(cqr); 2793 2794 if (erp == NULL) { 2795 /* no matching erp found - set up erp */ 2796 erp = dasd_3990_erp_additional_erp(cqr); 2797 if (IS_ERR(erp)) 2798 return erp; 2799 } else { 2800 /* matching erp found - set all leading erp's to DONE */ 2801 erp = dasd_3990_erp_handle_match_erp(cqr, erp); 2802 } 2803 2804 if (device->features & DASD_FEATURE_ERPLOG) { 2805 /* print current erp_chain */ 2806 dev_err(&device->cdev->dev, 2807 "ERP chain at END of ERP-ACTION\n"); 2808 for (temp_erp = erp; 2809 temp_erp != NULL; temp_erp = temp_erp->refers) { 2810 2811 dev_err(&device->cdev->dev, 2812 "ERP %p (%02x) refers to %p\n", 2813 temp_erp, temp_erp->status, 2814 temp_erp->refers); 2815 } 2816 } 2817 2818 /* enqueue ERP request if it's a new one */ 2819 if (list_empty(&erp->blocklist)) { 2820 cqr->status = DASD_CQR_IN_ERP; 2821 /* add erp request before the cqr */ 2822 list_add_tail(&erp->blocklist, &cqr->blocklist); 2823 } 2824 2825 2826 2827 return erp; 2828 2829 } /* end dasd_3990_erp_action */ 2830