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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 | /* * scsi.h Copyright (C) 1992 Drew Eckhardt * Copyright (C) 1993, 1994, 1995 Eric Youngdale * generic SCSI package header file by * Initial versions: Drew Eckhardt * Subsequent revisions: Eric Youngdale * * <drew@colorado.edu> * * Modified by Eric Youngdale eric@aib.com to * add scatter-gather, multiple outstanding request, and other * enhancements. */ #ifndef _SCSI_H #define _SCSI_H #include <linux/config.h> /* for CONFIG_SCSI_LOGGING */ /* * Some of the public constants are being moved to this file. * We include it here so that what came from where is transparent. */ #include <scsi/scsi.h> #include <linux/random.h> #include <asm/hardirq.h> #include <asm/scatterlist.h> #include <asm/io.h> /* * Some defs, in case these are not defined elsewhere. */ #ifndef TRUE # define TRUE 1 #endif #ifndef FALSE # define FALSE 0 #endif #define MAX_SCSI_DEVICE_CODE 14 extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE]; extern spinlock_t scsi_malloc_lock; #ifdef DEBUG #define SCSI_TIMEOUT (5*HZ) #else #define SCSI_TIMEOUT (2*HZ) #endif /* * Use these to separate status msg and our bytes * * These are set by: * * status byte = set from target device * msg_byte = return status from host adapter itself. * host_byte = set by low-level driver to indicate status. * driver_byte = set by mid-level. */ #define status_byte(result) (((result) >> 1) & 0x1f) #define msg_byte(result) (((result) >> 8) & 0xff) #define host_byte(result) (((result) >> 16) & 0xff) #define driver_byte(result) (((result) >> 24) & 0xff) #define suggestion(result) (driver_byte(result) & SUGGEST_MASK) #define sense_class(sense) (((sense) >> 4) & 0x7) #define sense_error(sense) ((sense) & 0xf) #define sense_valid(sense) ((sense) & 0x80); #define NEEDS_RETRY 0x2001 #define SUCCESS 0x2002 #define FAILED 0x2003 #define QUEUED 0x2004 #define SOFT_ERROR 0x2005 #define ADD_TO_MLQUEUE 0x2006 /* * These are the values that scsi_cmd->state can take. */ #define SCSI_STATE_TIMEOUT 0x1000 #define SCSI_STATE_FINISHED 0x1001 #define SCSI_STATE_FAILED 0x1002 #define SCSI_STATE_QUEUED 0x1003 #define SCSI_STATE_UNUSED 0x1006 #define SCSI_STATE_DISCONNECTING 0x1008 #define SCSI_STATE_INITIALIZING 0x1009 #define SCSI_STATE_BHQUEUE 0x100a #define SCSI_STATE_MLQUEUE 0x100b /* * These are the values that the owner field can take. * They are used as an indication of who the command belongs to. */ #define SCSI_OWNER_HIGHLEVEL 0x100 #define SCSI_OWNER_MIDLEVEL 0x101 #define SCSI_OWNER_LOWLEVEL 0x102 #define SCSI_OWNER_ERROR_HANDLER 0x103 #define SCSI_OWNER_BH_HANDLER 0x104 #define SCSI_OWNER_NOBODY 0x105 #define COMMAND_SIZE(opcode) scsi_command_size[((opcode) >> 5) & 7] #define IDENTIFY_BASE 0x80 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\ ((can_disconnect) ? 0x40 : 0) |\ ((lun) & 0x07)) /* * This defines the scsi logging feature. It is a means by which the * user can select how much information they get about various goings on, * and it can be really useful for fault tracing. The logging word is divided * into 8 nibbles, each of which describes a loglevel. The division of things * is somewhat arbitrary, and the division of the word could be changed if it * were really needed for any reason. The numbers below are the only place where these * are specified. For a first go-around, 3 bits is more than enough, since this * gives 8 levels of logging (really 7, since 0 is always off). Cutting to 2 bits * might be wise at some point. */ #define SCSI_LOG_ERROR_SHIFT 0 #define SCSI_LOG_TIMEOUT_SHIFT 3 #define SCSI_LOG_SCAN_SHIFT 6 #define SCSI_LOG_MLQUEUE_SHIFT 9 #define SCSI_LOG_MLCOMPLETE_SHIFT 12 #define SCSI_LOG_LLQUEUE_SHIFT 15 #define SCSI_LOG_LLCOMPLETE_SHIFT 18 #define SCSI_LOG_HLQUEUE_SHIFT 21 #define SCSI_LOG_HLCOMPLETE_SHIFT 24 #define SCSI_LOG_IOCTL_SHIFT 27 #define SCSI_LOG_ERROR_BITS 3 #define SCSI_LOG_TIMEOUT_BITS 3 #define SCSI_LOG_SCAN_BITS 3 #define SCSI_LOG_MLQUEUE_BITS 3 #define SCSI_LOG_MLCOMPLETE_BITS 3 #define SCSI_LOG_LLQUEUE_BITS 3 #define SCSI_LOG_LLCOMPLETE_BITS 3 #define SCSI_LOG_HLQUEUE_BITS 3 #define SCSI_LOG_HLCOMPLETE_BITS 3 #define SCSI_LOG_IOCTL_BITS 3 #if CONFIG_SCSI_LOGGING #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) \ { \ unsigned int mask; \ \ mask = (1 << (BITS)) - 1; \ if( ((scsi_logging_level >> (SHIFT)) & mask) > (LEVEL) ) \ { \ (CMD); \ } \ } #define SCSI_SET_LOGGING(SHIFT, BITS, LEVEL) \ { \ unsigned int mask; \ \ mask = ((1 << (BITS)) - 1) << SHIFT; \ scsi_logging_level = ((scsi_logging_level & ~mask) \ | ((LEVEL << SHIFT) & mask)); \ } #else /* * With no logging enabled, stub these out so they don't do anything. */ #define SCSI_SET_LOGGING(SHIFT, BITS, LEVEL) #define SCSI_CHECK_LOGGING(SHIFT, BITS, LEVEL, CMD) #endif /* * These are the macros that are actually used throughout the code to * log events. If logging isn't enabled, they are no-ops and will be * completely absent from the user's code. * * The 'set' versions of the macros are really intended to only be called * from the /proc filesystem, and in production kernels this will be about * all that is ever used. It could be useful in a debugging environment to * bump the logging level when certain strange events are detected, however. */ #define SCSI_LOG_ERROR_RECOVERY(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL,CMD); #define SCSI_LOG_TIMEOUT(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_TIMEOUT_SHIFT, SCSI_LOG_TIMEOUT_BITS, LEVEL,CMD); #define SCSI_LOG_SCAN_BUS(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_SCAN_SHIFT, SCSI_LOG_SCAN_BITS, LEVEL,CMD); #define SCSI_LOG_MLQUEUE(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS, LEVEL,CMD); #define SCSI_LOG_MLCOMPLETE(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS, LEVEL,CMD); #define SCSI_LOG_LLQUEUE(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_LLQUEUE_SHIFT, SCSI_LOG_LLQUEUE_BITS, LEVEL,CMD); #define SCSI_LOG_LLCOMPLETE(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_LLCOMPLETE_SHIFT, SCSI_LOG_LLCOMPLETE_BITS, LEVEL,CMD); #define SCSI_LOG_HLQUEUE(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_HLQUEUE_SHIFT, SCSI_LOG_HLQUEUE_BITS, LEVEL,CMD); #define SCSI_LOG_HLCOMPLETE(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_HLCOMPLETE_SHIFT, SCSI_LOG_HLCOMPLETE_BITS, LEVEL,CMD); #define SCSI_LOG_IOCTL(LEVEL,CMD) \ SCSI_CHECK_LOGGING(SCSI_LOG_IOCTL_SHIFT, SCSI_LOG_IOCTL_BITS, LEVEL,CMD); #define SCSI_SET_ERROR_RECOVERY_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_ERROR_SHIFT, SCSI_LOG_ERROR_BITS, LEVEL); #define SCSI_SET_TIMEOUT_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_TIMEOUT_SHIFT, SCSI_LOG_TIMEOUT_BITS, LEVEL); #define SCSI_SET_SCAN_BUS_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_SCAN_SHIFT, SCSI_LOG_SCAN_BITS, LEVEL); #define SCSI_SET_MLQUEUE_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS, LEVEL); #define SCSI_SET_MLCOMPLETE_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS, LEVEL); #define SCSI_SET_LLQUEUE_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_LLQUEUE_SHIFT, SCSI_LOG_LLQUEUE_BITS, LEVEL); #define SCSI_SET_LLCOMPLETE_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_LLCOMPLETE_SHIFT, SCSI_LOG_LLCOMPLETE_BITS, LEVEL); #define SCSI_SET_HLQUEUE_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_HLQUEUE_SHIFT, SCSI_LOG_HLQUEUE_BITS, LEVEL); #define SCSI_SET_HLCOMPLETE_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_HLCOMPLETE_SHIFT, SCSI_LOG_HLCOMPLETE_BITS, LEVEL); #define SCSI_SET_IOCTL_LOGGING(LEVEL) \ SCSI_SET_LOGGING(SCSI_LOG_IOCTL_SHIFT, SCSI_LOG_IOCTL_BITS, LEVEL); /* * the return of the status word will be in the following format : * The low byte is the status returned by the SCSI command, * with vendor specific bits masked. * * The next byte is the message which followed the SCSI status. * This allows a stos to be used, since the Intel is a little * endian machine. * * The final byte is a host return code, which is one of the following. * * IE * lsb msb * status msg host code * * Our errors returned by OUR driver, NOT SCSI message. Or'd with * SCSI message passed back to driver <IF any>. */ #define DID_OK 0x00 /* NO error */ #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */ #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */ #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */ #define DID_BAD_TARGET 0x04 /* BAD target. */ #define DID_ABORT 0x05 /* Told to abort for some other reason */ #define DID_PARITY 0x06 /* Parity error */ #define DID_ERROR 0x07 /* Internal error */ #define DID_RESET 0x08 /* Reset by somebody. */ #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */ #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */ #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */ #define DRIVER_OK 0x00 /* Driver status */ /* * These indicate the error that occurred, and what is available. */ #define DRIVER_BUSY 0x01 #define DRIVER_SOFT 0x02 #define DRIVER_MEDIA 0x03 #define DRIVER_ERROR 0x04 #define DRIVER_INVALID 0x05 #define DRIVER_TIMEOUT 0x06 #define DRIVER_HARD 0x07 #define DRIVER_SENSE 0x08 #define SUGGEST_RETRY 0x10 #define SUGGEST_ABORT 0x20 #define SUGGEST_REMAP 0x30 #define SUGGEST_DIE 0x40 #define SUGGEST_SENSE 0x80 #define SUGGEST_IS_OK 0xff #define DRIVER_MASK 0x0f #define SUGGEST_MASK 0xf0 #define MAX_COMMAND_SIZE 12 /* * SCSI command sets */ #define SCSI_UNKNOWN 0 #define SCSI_1 1 #define SCSI_1_CCS 2 #define SCSI_2 3 #define SCSI_3 4 /* * Every SCSI command starts with a one byte OP-code. * The next byte's high three bits are the LUN of the * device. Any multi-byte quantities are stored high byte * first, and may have a 5 bit MSB in the same byte * as the LUN. */ /* * As the scsi do command functions are intelligent, and may need to * redo a command, we need to keep track of the last command * executed on each one. */ #define WAS_RESET 0x01 #define WAS_TIMEDOUT 0x02 #define WAS_SENSE 0x04 #define IS_RESETTING 0x08 #define IS_ABORTING 0x10 #define ASKED_FOR_SENSE 0x20 #define SYNC_RESET 0x40 #if defined(__mc68000__) || defined(CONFIG_APUS) #include <asm/pgtable.h> #define CONTIGUOUS_BUFFERS(X,Y) \ (virt_to_phys((X)->b_data+(X)->b_size-1)+1==virt_to_phys((Y)->b_data)) #else #define CONTIGUOUS_BUFFERS(X,Y) ((X->b_data+X->b_size) == Y->b_data) #endif /* * This is the crap from the old error handling code. We have it in a special * place so that we can more easily delete it later on. */ #include "scsi_obsolete.h" /* * Add some typedefs so that we can prototyope a bunch of the functions. */ typedef struct scsi_device Scsi_Device; typedef struct scsi_cmnd Scsi_Cmnd; /* * Here is where we prototype most of the mid-layer. */ /* * Initializes all SCSI devices. This scans all scsi busses. */ extern int scsi_dev_init (void); void * scsi_malloc(unsigned int); int scsi_free(void *, unsigned int); extern unsigned int scsi_logging_level; /* What do we log? */ extern unsigned int scsi_dma_free_sectors; /* How much room do we have left */ extern unsigned int scsi_need_isa_buffer; /* True if some devices need indirection * buffers */ extern void scsi_make_blocked_list(void); extern volatile int in_scan_scsis; extern const unsigned char scsi_command_size[8]; /* * These are the error handling functions defined in scsi_error.c */ extern void scsi_add_timer(Scsi_Cmnd * SCset, int timeout, void (*complete)(Scsi_Cmnd *)); extern void scsi_done (Scsi_Cmnd *SCpnt); extern int scsi_delete_timer(Scsi_Cmnd * SCset); extern void scsi_error_handler(void * host); extern int scsi_retry_command(Scsi_Cmnd *); extern void scsi_finish_command(Scsi_Cmnd *); extern int scsi_sense_valid(Scsi_Cmnd *); extern int scsi_decide_disposition (Scsi_Cmnd * SCpnt); extern int scsi_block_when_processing_errors(Scsi_Device *); extern void scsi_sleep(int); extern int scsi_partsize(struct buffer_head *bh, unsigned long capacity, unsigned int *cyls, unsigned int *hds, unsigned int *secs); /* * scsi_abort aborts the current command that is executing on host host. * The error code, if non zero is returned in the host byte, otherwise * DID_ABORT is returned in the hostbyte. */ extern void scsi_do_cmd (Scsi_Cmnd *, const void *cmnd , void *buffer, unsigned bufflen, void (*done)(struct scsi_cmnd *), int timeout, int retries); extern Scsi_Cmnd * scsi_allocate_device(struct request **, Scsi_Device *, int); extern Scsi_Cmnd * scsi_request_queueable(struct request *, Scsi_Device *); extern void scsi_release_command(Scsi_Cmnd *); extern int max_scsi_hosts; extern void proc_print_scsidevice(Scsi_Device *, char *, int *, int); extern void print_command(unsigned char *); extern void print_sense(const char *, Scsi_Cmnd *); extern void print_driverbyte(int scsiresult); extern void print_hostbyte(int scsiresult); /* * The scsi_device struct contains what we know about each given scsi * device. */ struct scsi_device { /* private: */ /* * This information is private to the scsi mid-layer. Wrapping it in a * struct private is a way of marking it in a sort of C++ type of way. */ struct scsi_device * next; /* Used for linked list */ struct scsi_device * prev; /* Used for linked list */ struct wait_queue * device_wait;/* Used to wait if device is busy */ struct Scsi_Host * host; volatile unsigned short device_busy; /* commands actually active on low-level */ void (* scsi_request_fn)(void); /* Used to jumpstart things after an * ioctl */ Scsi_Cmnd * device_queue; /* queue of SCSI Command structures */ /* public: */ unsigned char id, lun, channel; unsigned int manufacturer; /* Manufacturer of device, for using * vendor-specific cmd's */ int attached; /* # of high level drivers attached to * this */ int access_count; /* Count of open channels/mounts */ void *hostdata; /* available to low-level driver */ char type; char scsi_level; char vendor[8], model[16], rev[4]; unsigned char current_tag; /* current tag */ unsigned char sync_min_period; /* Not less than this period */ unsigned char sync_max_offset; /* Not greater than this offset */ unsigned char queue_depth; /* How deep a queue to use */ unsigned online:1; unsigned writeable:1; unsigned removable:1; unsigned random:1; unsigned has_cmdblocks:1; unsigned changed:1; /* Data invalid due to media change */ unsigned busy:1; /* Used to prevent races */ unsigned lockable:1; /* Able to prevent media removal */ unsigned borken:1; /* Tell the Seagate driver to be * painfully slow on this device */ unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ unsigned tagged_queue:1; /* SCSI-II tagged queuing enabled */ unsigned disconnect:1; /* can disconnect */ unsigned soft_reset:1; /* Uses soft reset option */ unsigned sync:1; /* Negotiate for sync transfers */ unsigned wide:1; /* Negotiate for WIDE transfers */ unsigned single_lun:1; /* Indicates we should only allow I/O to * one of the luns for the device at a * time. */ unsigned was_reset:1; /* There was a bus reset on the bus for * this device */ unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN * because we did a bus reset. */ unsigned device_blocked:1; /* Device returned QUEUE_FULL. */ }; /* * The Scsi_Cmnd structure is used by scsi.c internally, and for communication * with low level drivers that support multiple outstanding commands. */ typedef struct scsi_pointer { char * ptr; /* data pointer */ int this_residual; /* left in this buffer */ struct scatterlist *buffer; /* which buffer */ int buffers_residual; /* how many buffers left */ volatile int Status; volatile int Message; volatile int have_data_in; volatile int sent_command; volatile int phase; } Scsi_Pointer; struct scsi_cmnd { /* private: */ /* * This information is private to the scsi mid-layer. Wrapping it in a * struct private is a way of marking it in a sort of C++ type of way. */ struct Scsi_Host * host; unsigned short state; unsigned short owner; Scsi_Device * device; struct scsi_cmnd * next; struct scsi_cmnd * reset_chain; int eh_state; /* Used for state tracking in error handlr */ void (*done)(struct scsi_cmnd *); /* Mid-level done function */ /* A SCSI Command is assigned a nonzero serial_number when internal_cmnd passes it to the driver's queue command function. The serial_number is cleared when scsi_done is entered indicating that the command has been completed. If a timeout occurs, the serial number at the moment of timeout is copied into serial_number_at_timeout. By subsequently comparing the serial_number and serial_number_at_timeout fields during abort or reset processing, we can detect whether the command has already completed. This also detects cases where the command has completed and the SCSI Command structure has already being reused for another command, so that we can avoid incorrectly aborting or resetting the new command. */ unsigned long serial_number; unsigned long serial_number_at_timeout; int retries; int allowed; int timeout_per_command; int timeout_total; int timeout; /* * We handle the timeout differently if it happens when a reset, * abort, etc are in process. */ unsigned volatile char internal_timeout; struct scsi_cmnd * bh_next; /* To enumerate the commands waiting to be processed. */ /* public: */ unsigned char target; unsigned char lun; unsigned char channel; unsigned char cmd_len; unsigned char old_cmd_len; /* These elements define the operation we are about to perform */ unsigned char cmnd[12]; unsigned request_bufflen; /* Actual request size */ struct timer_list eh_timeout; /* Used to time out the command. */ void * request_buffer; /* Actual requested buffer */ /* These elements define the operation we ultimately want to perform */ unsigned char data_cmnd[12]; unsigned short old_use_sg; /* We save use_sg here when requesting * sense info */ unsigned short use_sg; /* Number of pieces of scatter-gather */ unsigned short sglist_len; /* size of malloc'd scatter-gather list */ unsigned short abort_reason; /* If the mid-level code requests an * abort, this is the reason. */ unsigned bufflen; /* Size of data buffer */ void * buffer; /* Data buffer */ unsigned underflow; /* Return error if less than this amount is transfered */ unsigned transfersize; /* How much we are guaranteed to transfer with each SCSI transfer (ie, between disconnect / reconnects. Probably == sector size */ struct request request; /* A copy of the command we are working on */ unsigned char sense_buffer[16]; /* Sense for this command, needed */ unsigned flags; /* * These two flags are used to track commands that are in the * mid-level queue. The idea is that a command can be there for * one of two reasons - either the host is busy or the device is * busy. Thus when a command on the host finishes, we only try * and requeue commands that we might expect to be queueable. */ unsigned host_wait:1; unsigned device_wait:1; /* These variables are for the cdrom only. Once we have variable size * buffers in the buffer cache, they will go away. */ int this_count; /* End of special cdrom variables */ /* Low-level done function - can be used by low-level driver to point * to completion function. Not used by mid/upper level code. */ void (*scsi_done)(struct scsi_cmnd *); /* * The following fields can be written to by the host specific code. * Everything else should be left alone. */ Scsi_Pointer SCp; /* Scratchpad used by some host adapters */ unsigned char * host_scribble; /* The host adapter is allowed to * call scsi_malloc and get some memory * and hang it here. The host adapter * is also expected to call scsi_free * to release this memory. (The memory * obtained by scsi_malloc is guaranteed * to be at an address < 16Mb). */ int result; /* Status code from lower level driver */ unsigned char tag; /* SCSI-II queued command tag */ unsigned long pid; /* Process ID, starts at 0 */ }; /* * Definitions and prototypes used for scsi mid-level queue. */ #define SCSI_MLQUEUE_HOST_BUSY 0x1055 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056 extern int scsi_mlqueue_insert(Scsi_Cmnd * cmd, int reason); extern int scsi_mlqueue_finish(struct Scsi_Host * host, Scsi_Device * device); #if defined(MAJOR_NR) && (MAJOR_NR != SCSI_TAPE_MAJOR) #include "hosts.h" static Scsi_Cmnd * end_scsi_request(Scsi_Cmnd * SCpnt, int uptodate, int sectors) { struct request * req; struct buffer_head * bh; req = &SCpnt->request; req->errors = 0; if (!uptodate) { printk(DEVICE_NAME " I/O error: dev %s, sector %lu\n", kdevname(req->rq_dev), req->sector); } do { if ((bh = req->bh) != NULL) { req->bh = bh->b_reqnext; req->nr_sectors -= bh->b_size >> 9; req->sector += bh->b_size >> 9; bh->b_reqnext = NULL; sectors -= bh->b_size >> 9; bh->b_end_io(bh, uptodate); if ((bh = req->bh) != NULL) { req->current_nr_sectors = bh->b_size >> 9; if (req->nr_sectors < req->current_nr_sectors) { req->nr_sectors = req->current_nr_sectors; printk("end_scsi_request: buffer-list destroyed\n"); } } } } while(sectors && bh); if (req->bh){ req->buffer = bh->b_data; return SCpnt; } DEVICE_OFF(req->rq_dev); if (req->sem != NULL) { up(req->sem); } add_blkdev_randomness(MAJOR(req->rq_dev)); if (SCpnt->host->block) { struct Scsi_Host * next; for (next = SCpnt->host->block; next != SCpnt->host; next = next->block) wake_up(&next->host_wait); } wake_up(&wait_for_request); wake_up(&SCpnt->device->device_wait); scsi_release_command(SCpnt); return NULL; } /* This is just like INIT_REQUEST, but we need to be aware of the fact * that an interrupt may start another request, so we run this with interrupts * turned off */ #if MAJOR_NR == SCSI_DISK0_MAJOR #define CHECK_INITREQ_SD_MAJOR(major) SCSI_DISK_MAJOR(major) #else #define CHECK_INITREQ_SD_MAJOR(major) ((major) == MAJOR_NR) #endif #define INIT_SCSI_REQUEST \ if (!CURRENT) { \ CLEAR_INTR; \ return; \ } \ if (!CHECK_INITREQ_SD_MAJOR(MAJOR(CURRENT->rq_dev)))\ panic(DEVICE_NAME ": request list destroyed"); \ if (CURRENT->bh) { \ if (!buffer_locked(CURRENT->bh)) \ panic(DEVICE_NAME ": block not locked"); \ } #endif #define SCSI_SLEEP(QUEUE, CONDITION) { \ if (CONDITION) { \ struct wait_queue wait = { current, NULL}; \ add_wait_queue(QUEUE, &wait); \ for(;;) { \ current->state = TASK_UNINTERRUPTIBLE; \ if (CONDITION) { \ if (in_interrupt()) \ panic("scsi: trying to call schedule() in interrupt" \ ", file %s, line %d.\n", __FILE__, __LINE__); \ schedule(); \ } \ else \ break; \ } \ remove_wait_queue(QUEUE, &wait);\ current->state = TASK_RUNNING; \ }; } #endif /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-indent-level: 4 * c-brace-imaginary-offset: 0 * c-brace-offset: -4 * c-argdecl-indent: 4 * c-label-offset: -4 * c-continued-statement-offset: 4 * c-continued-brace-offset: 0 * indent-tabs-mode: nil * tab-width: 8 * End: */ |