1/* 2 * linux/drivers/ide/ide-tape.c Version 1.17a Jan, 2001 3 * 4 * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il> 5 * 6 * $Header: /home/user/PROJECT/WL-520gu-NewUI/src/linux/linux/drivers/ide/ide-tape.c,v 1.1.1.1 2008/10/15 03:26:33 james26_jang Exp $ 7 * 8 * This driver was constructed as a student project in the software laboratory 9 * of the faculty of electrical engineering in the Technion - Israel's 10 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. 11 * 12 * It is hereby placed under the terms of the GNU general public license. 13 * (See linux/COPYING). 14 */ 15 16 17/* 18 * An overview of the pipelined operation mode. 19 * 20 * In the pipelined write mode, we will usually just add requests to our 21 * pipeline and return immediately, before we even start to service them. The 22 * user program will then have enough time to prepare the next request while 23 * we are still busy servicing previous requests. In the pipelined read mode, 24 * the situation is similar - we add read-ahead requests into the pipeline, 25 * before the user even requested them. 26 * 27 * The pipeline can be viewed as a "safety net" which will be activated when 28 * the system load is high and prevents the user backup program from keeping up 29 * with the current tape speed. At this point, the pipeline will get 30 * shorter and shorter but the tape will still be streaming at the same speed. 31 * Assuming we have enough pipeline stages, the system load will hopefully 32 * decrease before the pipeline is completely empty, and the backup program 33 * will be able to "catch up" and refill the pipeline again. 34 * 35 * When using the pipelined mode, it would be best to disable any type of 36 * buffering done by the user program, as ide-tape already provides all the 37 * benefits in the kernel, where it can be done in a more efficient way. 38 * As we will usually not block the user program on a request, the most 39 * efficient user code will then be a simple read-write-read-... cycle. 40 * Any additional logic will usually just slow down the backup process. 41 * 42 * Using the pipelined mode, I get a constant over 400 KBps throughput, 43 * which seems to be the maximum throughput supported by my tape. 44 * 45 * However, there are some downfalls: 46 * 47 * 1. We use memory (for data buffers) in proportional to the number 48 * of pipeline stages (each stage is about 26 KB with my tape). 49 * 2. In the pipelined write mode, we cheat and postpone error codes 50 * to the user task. In read mode, the actual tape position 51 * will be a bit further than the last requested block. 52 * 53 * Concerning (1): 54 * 55 * 1. We allocate stages dynamically only when we need them. When 56 * we don't need them, we don't consume additional memory. In 57 * case we can't allocate stages, we just manage without them 58 * (at the expense of decreased throughput) so when Linux is 59 * tight in memory, we will not pose additional difficulties. 60 * 61 * 2. The maximum number of stages (which is, in fact, the maximum 62 * amount of memory) which we allocate is limited by the compile 63 * time parameter IDETAPE_MAX_PIPELINE_STAGES. 64 * 65 * 3. The maximum number of stages is a controlled parameter - We 66 * don't start from the user defined maximum number of stages 67 * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we 68 * will not even allocate this amount of stages if the user 69 * program can't handle the speed). We then implement a feedback 70 * loop which checks if the pipeline is empty, and if it is, we 71 * increase the maximum number of stages as necessary until we 72 * reach the optimum value which just manages to keep the tape 73 * busy with minimum allocated memory or until we reach 74 * IDETAPE_MAX_PIPELINE_STAGES. 75 * 76 * Concerning (2): 77 * 78 * In pipelined write mode, ide-tape can not return accurate error codes 79 * to the user program since we usually just add the request to the 80 * pipeline without waiting for it to be serviced. In case an error 81 * occurs, I will report it on the next user request. 82 * 83 * In the pipelined read mode, subsequent read requests or forward 84 * filemark spacing will perform correctly, as we preserve all blocks 85 * and filemarks which we encountered during our excess read-ahead. 86 * 87 * For accurate tape positioning and error reporting, disabling 88 * pipelined mode might be the best option. 89 * 90 * You can enable/disable/tune the pipelined operation mode by adjusting 91 * the compile time parameters below. 92 */ 93 94/* 95 * Possible improvements. 96 * 97 * 1. Support for the ATAPI overlap protocol. 98 * 99 * In order to maximize bus throughput, we currently use the DSC 100 * overlap method which enables ide.c to service requests from the 101 * other device while the tape is busy executing a command. The 102 * DSC overlap method involves polling the tape's status register 103 * for the DSC bit, and servicing the other device while the tape 104 * isn't ready. 105 * 106 * In the current QIC development standard (December 1995), 107 * it is recommended that new tape drives will *in addition* 108 * implement the ATAPI overlap protocol, which is used for the 109 * same purpose - efficient use of the IDE bus, but is interrupt 110 * driven and thus has much less CPU overhead. 111 * 112 * ATAPI overlap is likely to be supported in most new ATAPI 113 * devices, including new ATAPI cdroms, and thus provides us 114 * a method by which we can achieve higher throughput when 115 * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. 116 */ 117 118#define IDETAPE_VERSION "1.17a" 119 120#include <linux/config.h> 121#include <linux/module.h> 122#include <linux/types.h> 123#include <linux/string.h> 124#include <linux/kernel.h> 125#include <linux/delay.h> 126#include <linux/timer.h> 127#include <linux/mm.h> 128#include <linux/interrupt.h> 129#include <linux/major.h> 130#include <linux/devfs_fs_kernel.h> 131#include <linux/errno.h> 132#include <linux/genhd.h> 133#include <linux/slab.h> 134#include <linux/pci.h> 135#include <linux/ide.h> 136#include <linux/smp_lock.h> 137#include <linux/completion.h> 138 139#include <asm/byteorder.h> 140#include <asm/irq.h> 141#include <asm/uaccess.h> 142#include <asm/io.h> 143#include <asm/unaligned.h> 144#include <asm/bitops.h> 145 146 147#define NO_LONGER_REQUIRED (1) 148 149/* 150 * OnStream support 151 */ 152#define ONSTREAM_DEBUG (0) 153#define OS_CONFIG_PARTITION (0xff) 154#define OS_DATA_PARTITION (0) 155#define OS_PARTITION_VERSION (1) 156#define OS_EW 300 157#define OS_ADR_MINREV 2 158 159#define OS_DATA_STARTFRAME1 20 160#define OS_DATA_ENDFRAME1 2980 161/* 162 * partition 163 */ 164typedef struct os_partition_s { 165 __u8 partition_num; 166 __u8 par_desc_ver; 167 __u16 wrt_pass_cntr; 168 __u32 first_frame_addr; 169 __u32 last_frame_addr; 170 __u32 eod_frame_addr; 171} os_partition_t; 172 173/* 174 * DAT entry 175 */ 176typedef struct os_dat_entry_s { 177 __u32 blk_sz; 178 __u16 blk_cnt; 179 __u8 flags; 180 __u8 reserved; 181} os_dat_entry_t; 182 183/* 184 * DAT 185 */ 186#define OS_DAT_FLAGS_DATA (0xc) 187#define OS_DAT_FLAGS_MARK (0x1) 188 189typedef struct os_dat_s { 190 __u8 dat_sz; 191 __u8 reserved1; 192 __u8 entry_cnt; 193 __u8 reserved3; 194 os_dat_entry_t dat_list[16]; 195} os_dat_t; 196 197/* 198 * Frame types 199 */ 200#define OS_FRAME_TYPE_FILL (0) 201#define OS_FRAME_TYPE_EOD (1 << 0) 202#define OS_FRAME_TYPE_MARKER (1 << 1) 203#define OS_FRAME_TYPE_HEADER (1 << 3) 204#define OS_FRAME_TYPE_DATA (1 << 7) 205 206/* 207 * AUX 208 */ 209typedef struct os_aux_s { 210 __u32 format_id; /* hardware compability AUX is based on */ 211 char application_sig[4]; /* driver used to write this media */ 212 __u32 hdwr; /* reserved */ 213 __u32 update_frame_cntr; /* for configuration frame */ 214 __u8 frame_type; 215 __u8 frame_type_reserved; 216 __u8 reserved_18_19[2]; 217 os_partition_t partition; 218 __u8 reserved_36_43[8]; 219 __u32 frame_seq_num; 220 __u32 logical_blk_num_high; 221 __u32 logical_blk_num; 222 os_dat_t dat; 223 __u8 reserved188_191[4]; 224 __u32 filemark_cnt; 225 __u32 phys_fm; 226 __u32 last_mark_addr; 227 __u8 reserved204_223[20]; 228 229 /* 230 * __u8 app_specific[32]; 231 * 232 * Linux specific fields: 233 */ 234 __u32 next_mark_addr; /* when known, points to next marker */ 235 __u8 linux_specific[28]; 236 237 __u8 reserved_256_511[256]; 238} os_aux_t; 239 240typedef struct os_header_s { 241 char ident_str[8]; 242 __u8 major_rev; 243 __u8 minor_rev; 244 __u8 reserved10_15[6]; 245 __u8 par_num; 246 __u8 reserved1_3[3]; 247 os_partition_t partition; 248} os_header_t; 249 250/* 251 * OnStream Tape Parameters Page 252 */ 253typedef struct { 254 unsigned page_code :6; /* Page code - Should be 0x2b */ 255 unsigned reserved1_6 :1; 256 unsigned ps :1; 257 __u8 reserved2; 258 __u8 density; /* kbpi */ 259 __u8 reserved3,reserved4; 260 __u16 segtrk; /* segment of per track */ 261 __u16 trks; /* tracks per tape */ 262 __u8 reserved5,reserved6,reserved7,reserved8,reserved9,reserved10; 263} onstream_tape_paramtr_page_t; 264 265/* 266 * OnStream ADRL frame 267 */ 268#define OS_FRAME_SIZE (32 * 1024 + 512) 269#define OS_DATA_SIZE (32 * 1024) 270#define OS_AUX_SIZE (512) 271 272/* 273 * internal error codes for onstream 274 */ 275#define OS_PART_ERROR 2 276#define OS_WRITE_ERROR 1 277 278#include <linux/mtio.h> 279 280/**************************** Tunable parameters *****************************/ 281 282 283/* 284 * Pipelined mode parameters. 285 * 286 * We try to use the minimum number of stages which is enough to 287 * keep the tape constantly streaming. To accomplish that, we implement 288 * a feedback loop around the maximum number of stages: 289 * 290 * We start from MIN maximum stages (we will not even use MIN stages 291 * if we don't need them), increment it by RATE*(MAX-MIN) 292 * whenever we sense that the pipeline is empty, until we reach 293 * the optimum value or until we reach MAX. 294 * 295 * Setting the following parameter to 0 will disable the pipelined mode. 296 */ 297#define IDETAPE_MIN_PIPELINE_STAGES 200 298#define IDETAPE_MAX_PIPELINE_STAGES 400 299#define IDETAPE_INCREASE_STAGES_RATE 20 300 301/* 302 * The following are used to debug the driver: 303 * 304 * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. 305 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. 306 * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in 307 * some places. 308 * 309 * Setting them to 0 will restore normal operation mode: 310 * 311 * 1. Disable logging normal successful operations. 312 * 2. Disable self-sanity checks. 313 * 3. Errors will still be logged, of course. 314 * 315 * All the #if DEBUG code will be removed some day, when the driver 316 * is verified to be stable enough. This will make it much more 317 * esthetic. 318 */ 319#define IDETAPE_DEBUG_INFO 1 320#define IDETAPE_DEBUG_LOG 1 321#define IDETAPE_DEBUG_LOG_VERBOSE 0 322#define IDETAPE_DEBUG_BUGS 1 323 324/* 325 * After each failed packet command we issue a request sense command 326 * and retry the packet command IDETAPE_MAX_PC_RETRIES times. 327 * 328 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 329 */ 330#define IDETAPE_MAX_PC_RETRIES 3 331 332/* 333 * With each packet command, we allocate a buffer of 334 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet 335 * commands (Not for READ/WRITE commands). 336 */ 337#define IDETAPE_PC_BUFFER_SIZE 256 338 339/* 340 * In various places in the driver, we need to allocate storage 341 * for packet commands and requests, which will remain valid while 342 * we leave the driver to wait for an interrupt or a timeout event. 343 */ 344#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) 345 346/* 347 * Some tape drives require a long irq timeout 348 */ 349#define IDETAPE_WAIT_CMD (60*HZ) 350 351/* 352 * The following parameter is used to select the point in the internal 353 * tape fifo in which we will start to refill the buffer. Decreasing 354 * the following parameter will improve the system's latency and 355 * interactive response, while using a high value might improve sytem 356 * throughput. 357 */ 358#define IDETAPE_FIFO_THRESHOLD 2 359 360/* 361 * DSC polling parameters. 362 * 363 * Polling for DSC (a single bit in the status register) is a very 364 * important function in ide-tape. There are two cases in which we 365 * poll for DSC: 366 * 367 * 1. Before a read/write packet command, to ensure that we 368 * can transfer data from/to the tape's data buffers, without 369 * causing an actual media access. In case the tape is not 370 * ready yet, we take out our request from the device 371 * request queue, so that ide.c will service requests from 372 * the other device on the same interface meanwhile. 373 * 374 * 2. After the successful initialization of a "media access 375 * packet command", which is a command which can take a long 376 * time to complete (it can be several seconds or even an hour). 377 * 378 * Again, we postpone our request in the middle to free the bus 379 * for the other device. The polling frequency here should be 380 * lower than the read/write frequency since those media access 381 * commands are slow. We start from a "fast" frequency - 382 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC 383 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a 384 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). 385 * 386 * We also set a timeout for the timer, in case something goes wrong. 387 * The timeout should be longer then the maximum execution time of a 388 * tape operation. 389 */ 390 391/* 392 * DSC timings. 393 */ 394#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 395#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 396#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 397#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 398#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 399#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 400#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 401 402/*************************** End of tunable parameters ***********************/ 403 404/* 405 * Debugging/Performance analysis 406 * 407 * I/O trace support 408 */ 409#define USE_IOTRACE 0 410#if USE_IOTRACE 411#include <linux/io_trace.h> 412#define IO_IDETAPE_FIFO 500 413#endif 414 415/* 416 * Read/Write error simulation 417 */ 418#define SIMULATE_ERRORS 0 419 420/* 421 * For general magnetic tape device compatibility. 422 */ 423typedef enum { 424 idetape_direction_none, 425 idetape_direction_read, 426 idetape_direction_write 427} idetape_chrdev_direction_t; 428 429/* 430 * Our view of a packet command. 431 */ 432typedef struct idetape_packet_command_s { 433 u8 c[12]; /* Actual packet bytes */ 434 int retries; /* On each retry, we increment retries */ 435 int error; /* Error code */ 436 int request_transfer; /* Bytes to transfer */ 437 int actually_transferred; /* Bytes actually transferred */ 438 int buffer_size; /* Size of our data buffer */ 439 struct buffer_head *bh; 440 char *b_data; 441 int b_count; 442 byte *buffer; /* Data buffer */ 443 byte *current_position; /* Pointer into the above buffer */ 444 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ 445 byte pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ 446 unsigned long flags; /* Status/Action bit flags: long for set_bit */ 447} idetape_pc_t; 448 449/* 450 * Packet command flag bits. 451 */ 452#define PC_ABORT 0 /* Set when an error is considered normal - We won't retry */ 453#define PC_WAIT_FOR_DSC 1 /* 1 When polling for DSC on a media access command */ 454#define PC_DMA_RECOMMENDED 2 /* 1 when we prefer to use DMA if possible */ 455#define PC_DMA_IN_PROGRESS 3 /* 1 while DMA in progress */ 456#define PC_DMA_ERROR 4 /* 1 when encountered problem during DMA */ 457#define PC_WRITING 5 /* Data direction */ 458 459/* 460 * Capabilities and Mechanical Status Page 461 */ 462typedef struct { 463 unsigned page_code :6; /* Page code - Should be 0x2a */ 464 __u8 reserved0_6 :1; 465 __u8 ps :1; /* parameters saveable */ 466 __u8 page_length; /* Page Length - Should be 0x12 */ 467 __u8 reserved2, reserved3; 468 unsigned ro :1; /* Read Only Mode */ 469 unsigned reserved4_1234 :4; 470 unsigned sprev :1; /* Supports SPACE in the reverse direction */ 471 unsigned reserved4_67 :2; 472 unsigned reserved5_012 :3; 473 unsigned efmt :1; /* Supports ERASE command initiated formatting */ 474 unsigned reserved5_4 :1; 475 unsigned qfa :1; /* Supports the QFA two partition formats */ 476 unsigned reserved5_67 :2; 477 unsigned lock :1; /* Supports locking the volume */ 478 unsigned locked :1; /* The volume is locked */ 479 unsigned prevent :1; /* The device defaults in the prevent state after power up */ 480 unsigned eject :1; /* The device can eject the volume */ 481 __u8 disconnect :1; /* The device can break request > ctl */ 482 __u8 reserved6_5 :1; 483 unsigned ecc :1; /* Supports error correction */ 484 unsigned cmprs :1; /* Supports data compression */ 485 unsigned reserved7_0 :1; 486 unsigned blk512 :1; /* Supports 512 bytes block size */ 487 unsigned blk1024 :1; /* Supports 1024 bytes block size */ 488 unsigned reserved7_3_6 :4; 489 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ 490 /* transfers for slow buffer memory ??? */ 491 /* Also 32768 block size in some cases */ 492 __u16 max_speed; /* Maximum speed supported in KBps */ 493 __u8 reserved10, reserved11; 494 __u16 ctl; /* Continuous Transfer Limit in blocks */ 495 __u16 speed; /* Current Speed, in KBps */ 496 __u16 buffer_size; /* Buffer Size, in 512 bytes */ 497 __u8 reserved18, reserved19; 498} idetape_capabilities_page_t; 499 500/* 501 * Block Size Page 502 */ 503typedef struct { 504 unsigned page_code :6; /* Page code - Should be 0x30 */ 505 unsigned reserved1_6 :1; 506 unsigned ps :1; 507 __u8 page_length; /* Page Length - Should be 2 */ 508 __u8 reserved2; 509 unsigned play32 :1; 510 unsigned play32_5 :1; 511 unsigned reserved2_23 :2; 512 unsigned record32 :1; 513 unsigned record32_5 :1; 514 unsigned reserved2_6 :1; 515 unsigned one :1; 516} idetape_block_size_page_t; 517 518/* 519 * A pipeline stage. 520 */ 521typedef struct idetape_stage_s { 522 struct request rq; /* The corresponding request */ 523 struct buffer_head *bh; /* The data buffers */ 524 struct idetape_stage_s *next; /* Pointer to the next stage */ 525 os_aux_t *aux; /* OnStream aux ptr */ 526} idetape_stage_t; 527 528/* 529 * REQUEST SENSE packet command result - Data Format. 530 */ 531typedef struct { 532 unsigned error_code :7; /* Current of deferred errors */ 533 unsigned valid :1; /* The information field conforms to QIC-157C */ 534 __u8 reserved1 :8; /* Segment Number - Reserved */ 535 unsigned sense_key :4; /* Sense Key */ 536 unsigned reserved2_4 :1; /* Reserved */ 537 unsigned ili :1; /* Incorrect Length Indicator */ 538 unsigned eom :1; /* End Of Medium */ 539 unsigned filemark :1; /* Filemark */ 540 __u32 information __attribute__ ((packed)); 541 __u8 asl; /* Additional sense length (n-7) */ 542 __u32 command_specific; /* Additional command specific information */ 543 __u8 asc; /* Additional Sense Code */ 544 __u8 ascq; /* Additional Sense Code Qualifier */ 545 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ 546 unsigned sk_specific1 :7; /* Sense Key Specific */ 547 unsigned sksv :1; /* Sense Key Specific information is valid */ 548 __u8 sk_specific2; /* Sense Key Specific */ 549 __u8 sk_specific3; /* Sense Key Specific */ 550 __u8 pad[2]; /* Padding to 20 bytes */ 551} idetape_request_sense_result_t; 552 553 554/* 555 * Most of our global data which we need to save even as we leave the 556 * driver due to an interrupt or a timer event is stored in a variable 557 * of type idetape_tape_t, defined below. 558 */ 559typedef struct { 560 ide_drive_t *drive; 561 devfs_handle_t de_r, de_n; 562 563 /* 564 * Since a typical character device operation requires more 565 * than one packet command, we provide here enough memory 566 * for the maximum of interconnected packet commands. 567 * The packet commands are stored in the circular array pc_stack. 568 * pc_stack_index points to the last used entry, and warps around 569 * to the start when we get to the last array entry. 570 * 571 * pc points to the current processed packet command. 572 * 573 * failed_pc points to the last failed packet command, or contains 574 * NULL if we do not need to retry any packet command. This is 575 * required since an additional packet command is needed before the 576 * retry, to get detailed information on what went wrong. 577 */ 578 idetape_pc_t *pc; /* Current packet command */ 579 idetape_pc_t *failed_pc; /* Last failed packet command */ 580 idetape_pc_t pc_stack[IDETAPE_PC_STACK];/* Packet command stack */ 581 int pc_stack_index; /* Next free packet command storage space */ 582 struct request rq_stack[IDETAPE_PC_STACK]; 583 int rq_stack_index; /* We implement a circular array */ 584 585 /* 586 * DSC polling variables. 587 * 588 * While polling for DSC we use postponed_rq to postpone the 589 * current request so that ide.c will be able to service 590 * pending requests on the other device. Note that at most 591 * we will have only one DSC (usually data transfer) request 592 * in the device request queue. Additional requests can be 593 * queued in our internal pipeline, but they will be visible 594 * to ide.c only one at a time. 595 */ 596 struct request *postponed_rq; 597 unsigned long dsc_polling_start; /* The time in which we started polling for DSC */ 598 struct timer_list dsc_timer; /* Timer used to poll for dsc */ 599 unsigned long best_dsc_rw_frequency; /* Read/Write dsc polling frequency */ 600 unsigned long dsc_polling_frequency; /* The current polling frequency */ 601 unsigned long dsc_timeout; /* Maximum waiting time */ 602 603 /* 604 * Read position information 605 */ 606 byte partition; 607 unsigned int first_frame_position; /* Current block */ 608 unsigned int last_frame_position; 609 unsigned int blocks_in_buffer; 610 611 /* 612 * Last error information 613 */ 614 byte sense_key, asc, ascq; 615 616 /* 617 * Character device operation 618 */ 619 unsigned int minor; 620 char name[4]; /* device name */ 621 idetape_chrdev_direction_t chrdev_direction; /* Current character device data transfer direction */ 622 623 /* 624 * Device information 625 */ 626 unsigned short tape_block_size; /* Usually 512 or 1024 bytes */ 627 int user_bs_factor; 628 idetape_capabilities_page_t capabilities; /* Copy of the tape's Capabilities and Mechanical Page */ 629 630 /* 631 * Active data transfer request parameters. 632 * 633 * At most, there is only one ide-tape originated data transfer 634 * request in the device request queue. This allows ide.c to 635 * easily service requests from the other device when we 636 * postpone our active request. In the pipelined operation 637 * mode, we use our internal pipeline structure to hold 638 * more data requests. 639 * 640 * The data buffer size is chosen based on the tape's 641 * recommendation. 642 */ 643 struct request *active_data_request; /* Pointer to the request which is waiting in the device request queue */ 644 int stage_size; /* Data buffer size (chosen based on the tape's recommendation */ 645 idetape_stage_t *merge_stage; 646 int merge_stage_size; 647 struct buffer_head *bh; 648 char *b_data; 649 int b_count; 650 651 /* 652 * Pipeline parameters. 653 * 654 * To accomplish non-pipelined mode, we simply set the following 655 * variables to zero (or NULL, where appropriate). 656 */ 657 int nr_stages; /* Number of currently used stages */ 658 int nr_pending_stages; /* Number of pending stages */ 659 int max_stages, min_pipeline, max_pipeline; /* We will not allocate more than this number of stages */ 660 idetape_stage_t *first_stage; /* The first stage which will be removed from the pipeline */ 661 idetape_stage_t *active_stage; /* The currently active stage */ 662 idetape_stage_t *next_stage; /* Will be serviced after the currently active request */ 663 idetape_stage_t *last_stage; /* New requests will be added to the pipeline here */ 664 idetape_stage_t *cache_stage; /* Optional free stage which we can use */ 665 int pages_per_stage; 666 int excess_bh_size; /* Wasted space in each stage */ 667 668 unsigned long flags; /* Status/Action flags: long for set_bit */ 669 spinlock_t spinlock; /* protects the ide-tape queue */ 670 671 /* 672 * Measures average tape speed 673 */ 674 unsigned long avg_time; 675 int avg_size; 676 int avg_speed; 677 678 idetape_request_sense_result_t sense; /* last sense information */ 679 680 char vendor_id[10]; 681 char product_id[18]; 682 char firmware_revision[6]; 683 int firmware_revision_num; 684 685 int door_locked; /* the door is currently locked */ 686 687 /* 688 * OnStream flags 689 */ 690 int onstream; /* the tape is an OnStream tape */ 691 int raw; /* OnStream raw access (32.5KB block size) */ 692 int cur_frames; /* current number of frames in internal buffer */ 693 int max_frames; /* max number of frames in internal buffer */ 694 int logical_blk_num; /* logical block number */ 695 __u16 wrt_pass_cntr; /* write pass counter */ 696 __u32 update_frame_cntr; /* update frame counter */ 697 struct completion *waiting; 698 int onstream_write_error; /* write error recovery active */ 699 int header_ok; /* header frame verified ok */ 700 int linux_media; /* reading linux-specifc media */ 701 int linux_media_version; 702 char application_sig[5]; /* application signature */ 703 int filemark_cnt; 704 int first_mark_addr; 705 int last_mark_addr; 706 int eod_frame_addr; 707 unsigned long cmd_start_time; 708 unsigned long max_cmd_time; 709 unsigned capacity; 710 711 /* 712 * Optimize the number of "buffer filling" 713 * mode sense commands. 714 */ 715 unsigned long last_buffer_fill; /* last time in which we issued fill cmd */ 716 int req_buffer_fill; /* buffer fill command requested */ 717 int writes_since_buffer_fill; 718 int reads_since_buffer_fill; 719 720 /* 721 * Limit the number of times a request can 722 * be postponed, to avoid an infinite postpone 723 * deadlock. 724 */ 725 int postpone_cnt; /* request postpone count limit */ 726 727 /* 728 * Measures number of frames: 729 * 730 * 1. written/read to/from the driver pipeline (pipeline_head). 731 * 2. written/read to/from the tape buffers (buffer_head). 732 * 3. written/read by the tape to/from the media (tape_head). 733 */ 734 int pipeline_head; 735 int buffer_head; 736 int tape_head; 737 int last_tape_head; 738 739 /* 740 * Speed control at the tape buffers input/output 741 */ 742 unsigned long insert_time; 743 int insert_size; 744 int insert_speed; 745 int max_insert_speed; 746 int measure_insert_time; 747 748 /* 749 * Measure tape still time, in milliseconds 750 */ 751 unsigned long tape_still_time_begin; 752 int tape_still_time; 753 754 /* 755 * Speed regulation negative feedback loop 756 */ 757 int speed_control; 758 int pipeline_head_speed, controlled_pipeline_head_speed, uncontrolled_pipeline_head_speed; 759 int controlled_last_pipeline_head, uncontrolled_last_pipeline_head; 760 unsigned long uncontrolled_pipeline_head_time, controlled_pipeline_head_time; 761 int controlled_previous_pipeline_head, uncontrolled_previous_pipeline_head; 762 unsigned long controlled_previous_head_time, uncontrolled_previous_head_time; 763 int restart_speed_control_req; 764 765 /* 766 * Debug_level determines amount of debugging output; 767 * can be changed using /proc/ide/hdx/settings 768 * 0 : almost no debugging output 769 * 1 : 0+output errors only 770 * 2 : 1+output all sensekey/asc 771 * 3 : 2+follow all chrdev related procedures 772 * 4 : 3+follow all procedures 773 * 5 : 4+include pc_stack rq_stack info 774 * 6 : 5+USE_COUNT updates 775 */ 776 int debug_level; 777} idetape_tape_t; 778 779/* 780 * Tape door status 781 */ 782#define DOOR_UNLOCKED 0 783#define DOOR_LOCKED 1 784#define DOOR_EXPLICITLY_LOCKED 2 785 786/* 787 * Tape flag bits values. 788 */ 789#define IDETAPE_IGNORE_DSC 0 790#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ 791#define IDETAPE_BUSY 2 /* Device already opened */ 792#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ 793#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ 794#define IDETAPE_FILEMARK 5 /* Currently on a filemark */ 795#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ 796#define IDETAPE_READ_ERROR 7 797#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ 798 799/* 800 * Supported ATAPI tape drives packet commands 801 */ 802#define IDETAPE_TEST_UNIT_READY_CMD 0x00 803#define IDETAPE_REWIND_CMD 0x01 804#define IDETAPE_REQUEST_SENSE_CMD 0x03 805#define IDETAPE_READ_CMD 0x08 806#define IDETAPE_WRITE_CMD 0x0a 807#define IDETAPE_WRITE_FILEMARK_CMD 0x10 808#define IDETAPE_SPACE_CMD 0x11 809#define IDETAPE_INQUIRY_CMD 0x12 810#define IDETAPE_ERASE_CMD 0x19 811#define IDETAPE_MODE_SENSE_CMD 0x1a 812#define IDETAPE_MODE_SELECT_CMD 0x15 813#define IDETAPE_LOAD_UNLOAD_CMD 0x1b 814#define IDETAPE_PREVENT_CMD 0x1e 815#define IDETAPE_LOCATE_CMD 0x2b 816#define IDETAPE_READ_POSITION_CMD 0x34 817#define IDETAPE_READ_BUFFER_CMD 0x3c 818#define IDETAPE_SET_SPEED_CMD 0xbb 819 820/* 821 * Some defines for the READ BUFFER command 822 */ 823#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 824 825/* 826 * Some defines for the SPACE command 827 */ 828#define IDETAPE_SPACE_OVER_FILEMARK 1 829#define IDETAPE_SPACE_TO_EOD 3 830 831/* 832 * Some defines for the LOAD UNLOAD command 833 */ 834#define IDETAPE_LU_LOAD_MASK 1 835#define IDETAPE_LU_RETENSION_MASK 2 836#define IDETAPE_LU_EOT_MASK 4 837 838/* 839 * Special requests for our block device strategy routine. 840 * 841 * In order to service a character device command, we add special 842 * requests to the tail of our block device request queue and wait 843 * for their completion. 844 * 845 */ 846#define IDETAPE_FIRST_RQ 90 847 848/* 849 * IDETAPE_PC_RQ is used to queue a packet command in the request queue. 850 */ 851#define IDETAPE_PC_RQ1 90 852#define IDETAPE_PC_RQ2 91 853 854/* 855 * IDETAPE_READ_RQ and IDETAPE_WRITE_RQ are used by our 856 * character device interface to request read/write operations from 857 * our block device interface. 858 */ 859#define IDETAPE_READ_RQ 92 860#define IDETAPE_WRITE_RQ 93 861#define IDETAPE_ABORTED_WRITE_RQ 94 862#define IDETAPE_ABORTED_READ_RQ 95 863#define IDETAPE_READ_BUFFER_RQ 96 864 865#define IDETAPE_LAST_RQ 96 866 867/* 868 * A macro which can be used to check if a we support a given 869 * request command. 870 */ 871#define IDETAPE_RQ_CMD(cmd) ((cmd >= IDETAPE_FIRST_RQ) && (cmd <= IDETAPE_LAST_RQ)) 872 873/* 874 * Error codes which are returned in rq->errors to the higher part 875 * of the driver. 876 */ 877#define IDETAPE_ERROR_GENERAL 101 878#define IDETAPE_ERROR_FILEMARK 102 879#define IDETAPE_ERROR_EOD 103 880 881/* 882 * The ATAPI Status Register. 883 */ 884typedef union { 885 unsigned all :8; 886 struct { 887 unsigned check :1; /* Error occurred */ 888 unsigned idx :1; /* Reserved */ 889 unsigned corr :1; /* Correctable error occurred */ 890 unsigned drq :1; /* Data is request by the device */ 891 unsigned dsc :1; /* Buffer availability / Media access command finished */ 892 unsigned reserved5 :1; /* Reserved */ 893 unsigned drdy :1; /* Ignored for ATAPI commands (ready to accept ATA command) */ 894 unsigned bsy :1; /* The device has access to the command block */ 895 } b; 896} idetape_status_reg_t; 897 898/* 899 * The ATAPI error register. 900 */ 901typedef union { 902 unsigned all :8; 903 struct { 904 unsigned ili :1; /* Illegal Length Indication */ 905 unsigned eom :1; /* End Of Media Detected */ 906 unsigned abrt :1; /* Aborted command - As defined by ATA */ 907 unsigned mcr :1; /* Media Change Requested - As defined by ATA */ 908 unsigned sense_key :4; /* Sense key of the last failed packet command */ 909 } b; 910} idetape_error_reg_t; 911 912/* 913 * ATAPI Feature Register 914 */ 915typedef union { 916 unsigned all :8; 917 struct { 918 unsigned dma :1; /* Using DMA or PIO */ 919 unsigned reserved321 :3; /* Reserved */ 920 unsigned reserved654 :3; /* Reserved (Tag Type) */ 921 unsigned reserved7 :1; /* Reserved */ 922 } b; 923} idetape_feature_reg_t; 924 925/* 926 * ATAPI Byte Count Register. 927 */ 928typedef union { 929 unsigned all :16; 930 struct { 931 unsigned low :8; /* LSB */ 932 unsigned high :8; /* MSB */ 933 } b; 934} idetape_bcount_reg_t; 935 936/* 937 * ATAPI Interrupt Reason Register. 938 */ 939typedef union { 940 unsigned all :8; 941 struct { 942 unsigned cod :1; /* Information transferred is command (1) or data (0) */ 943 unsigned io :1; /* The device requests us to read (1) or write (0) */ 944 unsigned reserved :6; /* Reserved */ 945 } b; 946} idetape_ireason_reg_t; 947 948/* 949 * ATAPI Drive Select Register 950 */ 951typedef union { 952 unsigned all :8; 953 struct { 954 unsigned sam_lun :4; /* Should be zero with ATAPI (not used) */ 955 unsigned drv :1; /* The responding drive will be drive 0 (0) or drive 1 (1) */ 956 unsigned one5 :1; /* Should be set to 1 */ 957 unsigned reserved6 :1; /* Reserved */ 958 unsigned one7 :1; /* Should be set to 1 */ 959 } b; 960} idetape_drivesel_reg_t; 961 962/* 963 * ATAPI Device Control Register 964 */ 965typedef union { 966 unsigned all :8; 967 struct { 968 unsigned zero0 :1; /* Should be set to zero */ 969 unsigned nien :1; /* Device interrupt is disabled (1) or enabled (0) */ 970 unsigned srst :1; /* ATA software reset. ATAPI devices should use the new ATAPI srst. */ 971 unsigned one3 :1; /* Should be set to 1 */ 972 unsigned reserved4567 :4; /* Reserved */ 973 } b; 974} idetape_control_reg_t; 975 976/* 977 * idetape_chrdev_t provides the link between out character device 978 * interface and our block device interface and the corresponding 979 * ide_drive_t structure. 980 */ 981typedef struct { 982 ide_drive_t *drive; 983} idetape_chrdev_t; 984 985/* 986 * The following is used to format the general configuration word of 987 * the ATAPI IDENTIFY DEVICE command. 988 */ 989struct idetape_id_gcw { 990 unsigned packet_size :2; /* Packet Size */ 991 unsigned reserved234 :3; /* Reserved */ 992 unsigned drq_type :2; /* Command packet DRQ type */ 993 unsigned removable :1; /* Removable media */ 994 unsigned device_type :5; /* Device type */ 995 unsigned reserved13 :1; /* Reserved */ 996 unsigned protocol :2; /* Protocol type */ 997}; 998 999/* 1000 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) 1001 */ 1002typedef struct { 1003 unsigned device_type :5; /* Peripheral Device Type */ 1004 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ 1005 unsigned reserved1_6t0 :7; /* Reserved */ 1006 unsigned rmb :1; /* Removable Medium Bit */ 1007 unsigned ansi_version :3; /* ANSI Version */ 1008 unsigned ecma_version :3; /* ECMA Version */ 1009 unsigned iso_version :2; /* ISO Version */ 1010 unsigned response_format :4; /* Response Data Format */ 1011 unsigned reserved3_45 :2; /* Reserved */ 1012 unsigned reserved3_6 :1; /* TrmIOP - Reserved */ 1013 unsigned reserved3_7 :1; /* AENC - Reserved */ 1014 __u8 additional_length; /* Additional Length (total_length-4) */ 1015 __u8 rsv5, rsv6, rsv7; /* Reserved */ 1016 __u8 vendor_id[8]; /* Vendor Identification */ 1017 __u8 product_id[16]; /* Product Identification */ 1018 __u8 revision_level[4]; /* Revision Level */ 1019 __u8 vendor_specific[20]; /* Vendor Specific - Optional */ 1020 __u8 reserved56t95[40]; /* Reserved - Optional */ 1021 /* Additional information may be returned */ 1022} idetape_inquiry_result_t; 1023 1024/* 1025 * READ POSITION packet command - Data Format (From Table 6-57) 1026 */ 1027typedef struct { 1028 unsigned reserved0_10 :2; /* Reserved */ 1029 unsigned bpu :1; /* Block Position Unknown */ 1030 unsigned reserved0_543 :3; /* Reserved */ 1031 unsigned eop :1; /* End Of Partition */ 1032 unsigned bop :1; /* Beginning Of Partition */ 1033 u8 partition; /* Partition Number */ 1034 u8 reserved2, reserved3; /* Reserved */ 1035 u32 first_block; /* First Block Location */ 1036 u32 last_block; /* Last Block Location (Optional) */ 1037 u8 reserved12; /* Reserved */ 1038 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ 1039 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ 1040} idetape_read_position_result_t; 1041 1042/* 1043 * Follows structures which are related to the SELECT SENSE / MODE SENSE 1044 * packet commands. Those packet commands are still not supported 1045 * by ide-tape. 1046 */ 1047#define IDETAPE_BLOCK_DESCRIPTOR 0 1048#define IDETAPE_CAPABILITIES_PAGE 0x2a 1049#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ 1050#define IDETAPE_BLOCK_SIZE_PAGE 0x30 1051#define IDETAPE_BUFFER_FILLING_PAGE 0x33 1052 1053/* 1054 * Mode Parameter Header for the MODE SENSE packet command 1055 */ 1056typedef struct { 1057 __u8 mode_data_length; /* Length of the following data transfer */ 1058 __u8 medium_type; /* Medium Type */ 1059 __u8 dsp; /* Device Specific Parameter */ 1060 __u8 bdl; /* Block Descriptor Length */ 1061} idetape_mode_parameter_header_t; 1062 1063/* 1064 * Mode Parameter Block Descriptor the MODE SENSE packet command 1065 * 1066 * Support for block descriptors is optional. 1067 */ 1068typedef struct { 1069 __u8 density_code; /* Medium density code */ 1070 __u8 blocks[3]; /* Number of blocks */ 1071 __u8 reserved4; /* Reserved */ 1072 __u8 length[3]; /* Block Length */ 1073} idetape_parameter_block_descriptor_t; 1074 1075/* 1076 * The Data Compression Page, as returned by the MODE SENSE packet command. 1077 */ 1078typedef struct { 1079 unsigned page_code :6; /* Page Code - Should be 0xf */ 1080 unsigned reserved0 :1; /* Reserved */ 1081 unsigned ps :1; 1082 __u8 page_length; /* Page Length - Should be 14 */ 1083 unsigned reserved2 :6; /* Reserved */ 1084 unsigned dcc :1; /* Data Compression Capable */ 1085 unsigned dce :1; /* Data Compression Enable */ 1086 unsigned reserved3 :5; /* Reserved */ 1087 unsigned red :2; /* Report Exception on Decompression */ 1088 unsigned dde :1; /* Data Decompression Enable */ 1089 __u32 ca; /* Compression Algorithm */ 1090 __u32 da; /* Decompression Algorithm */ 1091 __u8 reserved[4]; /* Reserved */ 1092} idetape_data_compression_page_t; 1093 1094/* 1095 * The Medium Partition Page, as returned by the MODE SENSE packet command. 1096 */ 1097typedef struct { 1098 unsigned page_code :6; /* Page Code - Should be 0x11 */ 1099 unsigned reserved1_6 :1; /* Reserved */ 1100 unsigned ps :1; 1101 __u8 page_length; /* Page Length - Should be 6 */ 1102 __u8 map; /* Maximum Additional Partitions - Should be 0 */ 1103 __u8 apd; /* Additional Partitions Defined - Should be 0 */ 1104 unsigned reserved4_012 :3; /* Reserved */ 1105 unsigned psum :2; /* Should be 0 */ 1106 unsigned idp :1; /* Should be 0 */ 1107 unsigned sdp :1; /* Should be 0 */ 1108 unsigned fdp :1; /* Fixed Data Partitions */ 1109 __u8 mfr; /* Medium Format Recognition */ 1110 __u8 reserved[2]; /* Reserved */ 1111} idetape_medium_partition_page_t; 1112 1113/* 1114 * Run time configurable parameters. 1115 */ 1116typedef struct { 1117 int dsc_rw_frequency; 1118 int dsc_media_access_frequency; 1119 int nr_stages; 1120} idetape_config_t; 1121 1122/* 1123 * The variables below are used for the character device interface. 1124 * Additional state variables are defined in our ide_drive_t structure. 1125 */ 1126static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES]; 1127static int idetape_chrdev_present = 0; 1128 1129#if IDETAPE_DEBUG_LOG_VERBOSE 1130 1131/* 1132 * DO NOT REMOVE, BUILDING A VERBOSE DEBUG SCHEME FOR ATAPI 1133 */ 1134 1135char *idetape_sense_key_verbose (byte idetape_sense_key) 1136{ 1137 switch (idetape_sense_key) { 1138 default: { 1139 char buf[22]; 1140 sprintf(buf, "IDETAPE_SENSE (0x%02x)", idetape_sense_key); 1141 return(buf); 1142 } 1143 1144 } 1145} 1146 1147char *idetape_command_key_verbose (byte idetape_command_key) 1148{ 1149 switch (idetape_command_key) { 1150 case IDETAPE_TEST_UNIT_READY_CMD: return("TEST_UNIT_READY_CMD"); 1151 case IDETAPE_REWIND_CMD: return("REWIND_CMD"); 1152 case IDETAPE_REQUEST_SENSE_CMD: return("REQUEST_SENSE_CMD"); 1153 case IDETAPE_READ_CMD: return("READ_CMD"); 1154 case IDETAPE_WRITE_CMD: return("WRITE_CMD"); 1155 case IDETAPE_WRITE_FILEMARK_CMD: return("WRITE_FILEMARK_CMD"); 1156 case IDETAPE_SPACE_CMD: return("SPACE_CMD"); 1157 case IDETAPE_INQUIRY_CMD: return("INQUIRY_CMD"); 1158 case IDETAPE_ERASE_CMD: return("ERASE_CMD"); 1159 case IDETAPE_MODE_SENSE_CMD: return("MODE_SENSE_CMD"); 1160 case IDETAPE_MODE_SELECT_CMD: return("MODE_SELECT_CMD"); 1161 case IDETAPE_LOAD_UNLOAD_CMD: return("LOAD_UNLOAD_CMD"); 1162 case IDETAPE_PREVENT_CMD: return("PREVENT_CMD"); 1163 case IDETAPE_LOCATE_CMD: return("LOCATE_CMD"); 1164 case IDETAPE_READ_POSITION_CMD: return("READ_POSITION_CMD"); 1165 case IDETAPE_READ_BUFFER_CMD: return("READ_BUFFER_CMD"); 1166 case IDETAPE_SET_SPEED_CMD: return("SET_SPEED_CMD"); 1167 default: { 1168 char buf[20]; 1169 sprintf(buf, "CMD (0x%02x)", idetape_command_key); 1170 return(buf); 1171 } 1172 } 1173} 1174#endif /* IDETAPE_DEBUG_LOG_VERBOSE */ 1175 1176/* 1177 * Function declarations 1178 * 1179 */ 1180static void idetape_onstream_mode_sense_tape_parameter_page(ide_drive_t *drive, int debug); 1181static int idetape_chrdev_release (struct inode *inode, struct file *filp); 1182static void idetape_write_release (struct inode *inode); 1183 1184/* 1185 * Too bad. The drive wants to send us data which we are not ready to accept. 1186 * Just throw it away. 1187 */ 1188static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) 1189{ 1190 while (bcount--) 1191 IN_BYTE (IDE_DATA_REG); 1192} 1193 1194static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 1195{ 1196 struct buffer_head *bh = pc->bh; 1197 int count; 1198 1199 while (bcount) { 1200#if IDETAPE_DEBUG_BUGS 1201 if (bh == NULL) { 1202 printk (KERN_ERR "ide-tape: bh == NULL in idetape_input_buffers\n"); 1203 idetape_discard_data (drive, bcount); 1204 return; 1205 } 1206#endif /* IDETAPE_DEBUG_BUGS */ 1207 count = IDE_MIN (bh->b_size - atomic_read(&bh->b_count), bcount); 1208 atapi_input_bytes (drive, bh->b_data + atomic_read(&bh->b_count), count); 1209 bcount -= count; 1210 atomic_add(count, &bh->b_count); 1211 if (atomic_read(&bh->b_count) == bh->b_size) { 1212 bh = bh->b_reqnext; 1213 if (bh) 1214 atomic_set(&bh->b_count, 0); 1215 } 1216 } 1217 pc->bh = bh; 1218} 1219 1220static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 1221{ 1222 struct buffer_head *bh = pc->bh; 1223 int count; 1224 1225 while (bcount) { 1226#if IDETAPE_DEBUG_BUGS 1227 if (bh == NULL) { 1228 printk (KERN_ERR "ide-tape: bh == NULL in idetape_output_buffers\n"); 1229 return; 1230 } 1231#endif /* IDETAPE_DEBUG_BUGS */ 1232 count = IDE_MIN (pc->b_count, bcount); 1233 atapi_output_bytes (drive, pc->b_data, count); 1234 bcount -= count; 1235 pc->b_data += count; 1236 pc->b_count -= count; 1237 if (!pc->b_count) { 1238 pc->bh = bh = bh->b_reqnext; 1239 if (bh) { 1240 pc->b_data = bh->b_data; 1241 pc->b_count = atomic_read(&bh->b_count); 1242 } 1243 } 1244 } 1245} 1246 1247#ifdef CONFIG_BLK_DEV_IDEDMA 1248static void idetape_update_buffers (idetape_pc_t *pc) 1249{ 1250 struct buffer_head *bh = pc->bh; 1251 int count, bcount = pc->actually_transferred; 1252 1253 if (test_bit (PC_WRITING, &pc->flags)) 1254 return; 1255 while (bcount) { 1256#if IDETAPE_DEBUG_BUGS 1257 if (bh == NULL) { 1258 printk (KERN_ERR "ide-tape: bh == NULL in idetape_update_buffers\n"); 1259 return; 1260 } 1261#endif /* IDETAPE_DEBUG_BUGS */ 1262 count = IDE_MIN (bh->b_size, bcount); 1263 atomic_set(&bh->b_count, count); 1264 if (atomic_read(&bh->b_count) == bh->b_size) 1265 bh = bh->b_reqnext; 1266 bcount -= count; 1267 } 1268 pc->bh = bh; 1269} 1270#endif /* CONFIG_BLK_DEV_IDEDMA */ 1271 1272/* 1273 * idetape_next_pc_storage returns a pointer to a place in which we can 1274 * safely store a packet command, even though we intend to leave the 1275 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet 1276 * commands is allocated at initialization time. 1277 */ 1278static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) 1279{ 1280 idetape_tape_t *tape = drive->driver_data; 1281 1282#if IDETAPE_DEBUG_LOG 1283 if (tape->debug_level >= 5) 1284 printk (KERN_INFO "ide-tape: pc_stack_index=%d\n",tape->pc_stack_index); 1285#endif /* IDETAPE_DEBUG_LOG */ 1286 if (tape->pc_stack_index==IDETAPE_PC_STACK) 1287 tape->pc_stack_index=0; 1288 return (&tape->pc_stack[tape->pc_stack_index++]); 1289} 1290 1291/* 1292 * idetape_next_rq_storage is used along with idetape_next_pc_storage. 1293 * Since we queue packet commands in the request queue, we need to 1294 * allocate a request, along with the allocation of a packet command. 1295 */ 1296 1297/************************************************************** 1298 * * 1299 * This should get fixed to use kmalloc(.., GFP_ATOMIC) * 1300 * followed later on by kfree(). -ml * 1301 * * 1302 **************************************************************/ 1303 1304static struct request *idetape_next_rq_storage (ide_drive_t *drive) 1305{ 1306 idetape_tape_t *tape = drive->driver_data; 1307 1308#if IDETAPE_DEBUG_LOG 1309 if (tape->debug_level >= 5) 1310 printk (KERN_INFO "ide-tape: rq_stack_index=%d\n",tape->rq_stack_index); 1311#endif /* IDETAPE_DEBUG_LOG */ 1312 if (tape->rq_stack_index==IDETAPE_PC_STACK) 1313 tape->rq_stack_index=0; 1314 return (&tape->rq_stack[tape->rq_stack_index++]); 1315} 1316 1317/* 1318 * idetape_init_pc initializes a packet command. 1319 */ 1320static void idetape_init_pc (idetape_pc_t *pc) 1321{ 1322 memset (pc->c, 0, 12); 1323 pc->retries = 0; 1324 pc->flags = 0; 1325 pc->request_transfer = 0; 1326 pc->buffer = pc->pc_buffer; 1327 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; 1328 pc->bh = NULL; 1329 pc->b_data = NULL; 1330} 1331 1332/* 1333 * idetape_analyze_error is called on each failed packet command retry 1334 * to analyze the request sense. We currently do not utilize this 1335 * information. 1336 */ 1337static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) 1338{ 1339 idetape_tape_t *tape = drive->driver_data; 1340 idetape_pc_t *pc = tape->failed_pc; 1341 1342 tape->sense = *result; 1343 tape->sense_key = result->sense_key; 1344 tape->asc = result->asc; 1345 tape->ascq = result->ascq; 1346#if IDETAPE_DEBUG_LOG 1347 /* 1348 * Without debugging, we only log an error if we decided to 1349 * give up retrying. 1350 */ 1351 if (tape->debug_level >= 1) 1352 printk (KERN_INFO "ide-tape: pc = %x, sense key = %x, asc = %x, ascq = %x\n", 1353 pc->c[0], result->sense_key, result->asc, result->ascq); 1354#if IDETAPE_DEBUG_LOG_VERBOSE 1355 if (tape->debug_level >= 1) 1356 printk (KERN_INFO "ide-tape: pc = %s, sense key = %x, asc = %x, ascq = %x\n", 1357 idetape_command_key_verbose((byte) pc->c[0]), 1358 result->sense_key, 1359 result->asc, 1360 result->ascq); 1361#endif /* IDETAPE_DEBUG_LOG_VERBOSE */ 1362#endif /* IDETAPE_DEBUG_LOG */ 1363 1364 if (tape->onstream && result->sense_key == 2 && result->asc == 0x53 && result->ascq == 2) { 1365 clear_bit(PC_DMA_ERROR, &pc->flags); 1366 ide_stall_queue(drive, HZ / 2); 1367 return; 1368 } 1369#ifdef CONFIG_BLK_DEV_IDEDMA 1370 1371 /* 1372 * Correct pc->actually_transferred by asking the tape. 1373 */ 1374 if (test_bit (PC_DMA_ERROR, &pc->flags)) { 1375 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl (get_unaligned (&result->information)); 1376 idetape_update_buffers (pc); 1377 } 1378#endif /* CONFIG_BLK_DEV_IDEDMA */ 1379 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { 1380 pc->error = IDETAPE_ERROR_FILEMARK; 1381 set_bit (PC_ABORT, &pc->flags); 1382 } 1383 if (pc->c[0] == IDETAPE_WRITE_CMD) { 1384 if (result->eom || (result->sense_key == 0xd && result->asc == 0x0 && result->ascq == 0x2)) { 1385 pc->error = IDETAPE_ERROR_EOD; 1386 set_bit (PC_ABORT, &pc->flags); 1387 } 1388 } 1389 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { 1390 if (result->sense_key == 8) { 1391 pc->error = IDETAPE_ERROR_EOD; 1392 set_bit (PC_ABORT, &pc->flags); 1393 } 1394 if (!test_bit (PC_ABORT, &pc->flags) && (tape->onstream || pc->actually_transferred)) 1395 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 1396 } 1397} 1398 1399static void idetape_abort_pipeline (ide_drive_t *drive) 1400{ 1401 idetape_tape_t *tape = drive->driver_data; 1402 idetape_stage_t *stage = tape->next_stage; 1403 1404#if IDETAPE_DEBUG_LOG 1405 if (tape->debug_level >= 4) 1406 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); 1407#endif 1408 while (stage) { 1409 if (stage->rq.cmd == IDETAPE_WRITE_RQ) 1410 stage->rq.cmd = IDETAPE_ABORTED_WRITE_RQ; 1411 else if (stage->rq.cmd == IDETAPE_READ_RQ) 1412 stage->rq.cmd = IDETAPE_ABORTED_READ_RQ; 1413 stage = stage->next; 1414 } 1415} 1416 1417/* 1418 * idetape_active_next_stage will declare the next stage as "active". 1419 */ 1420static void idetape_active_next_stage (ide_drive_t *drive) 1421{ 1422 idetape_tape_t *tape = drive->driver_data; 1423 idetape_stage_t *stage = tape->next_stage; 1424 struct request *rq = &stage->rq; 1425 1426#if IDETAPE_DEBUG_LOG 1427 if (tape->debug_level >= 4) 1428 printk (KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); 1429#endif /* IDETAPE_DEBUG_LOG */ 1430#if IDETAPE_DEBUG_BUGS 1431 if (stage == NULL) { 1432 printk (KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); 1433 return; 1434 } 1435#endif /* IDETAPE_DEBUG_BUGS */ 1436 1437 rq->buffer = NULL; 1438 rq->bh = stage->bh; 1439 tape->active_data_request = rq; 1440 tape->active_stage = stage; 1441 tape->next_stage = stage->next; 1442} 1443 1444/* 1445 * idetape_increase_max_pipeline_stages is a part of the feedback 1446 * loop which tries to find the optimum number of stages. In the 1447 * feedback loop, we are starting from a minimum maximum number of 1448 * stages, and if we sense that the pipeline is empty, we try to 1449 * increase it, until we reach the user compile time memory limit. 1450 */ 1451static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) 1452{ 1453 idetape_tape_t *tape = drive->driver_data; 1454 int increase = (tape->max_pipeline - tape->min_pipeline) / 10; 1455 1456#if IDETAPE_DEBUG_LOG 1457 if (tape->debug_level >= 4) 1458 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); 1459#endif /* IDETAPE_DEBUG_LOG */ 1460 1461 tape->max_stages += increase; 1462 tape->max_stages = IDE_MAX(tape->max_stages, tape->min_pipeline); 1463 tape->max_stages = IDE_MIN(tape->max_stages, tape->max_pipeline); 1464} 1465 1466/* 1467 * idetape_kfree_stage calls kfree to completely free a stage, along with 1468 * its related buffers. 1469 */ 1470static void __idetape_kfree_stage (idetape_stage_t *stage) 1471{ 1472 struct buffer_head *prev_bh, *bh = stage->bh; 1473 int size; 1474 1475 while (bh != NULL) { 1476 if (bh->b_data != NULL) { 1477 size = (int) bh->b_size; 1478 while (size > 0) { 1479 free_page ((unsigned long) bh->b_data); 1480 size -= PAGE_SIZE; 1481 bh->b_data += PAGE_SIZE; 1482 } 1483 } 1484 prev_bh = bh; 1485 bh = bh->b_reqnext; 1486 kfree (prev_bh); 1487 } 1488 kfree (stage); 1489} 1490 1491static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) 1492{ 1493 __idetape_kfree_stage (stage); 1494} 1495 1496/* 1497 * idetape_remove_stage_head removes tape->first_stage from the pipeline. 1498 * The caller should avoid race conditions. 1499 */ 1500static void idetape_remove_stage_head (ide_drive_t *drive) 1501{ 1502 idetape_tape_t *tape = drive->driver_data; 1503 idetape_stage_t *stage; 1504 1505#if IDETAPE_DEBUG_LOG 1506 if (tape->debug_level >= 4) 1507 printk (KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); 1508#endif /* IDETAPE_DEBUG_LOG */ 1509#if IDETAPE_DEBUG_BUGS 1510 if (tape->first_stage == NULL) { 1511 printk (KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); 1512 return; 1513 } 1514 if (tape->active_stage == tape->first_stage) { 1515 printk (KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); 1516 return; 1517 } 1518#endif /* IDETAPE_DEBUG_BUGS */ 1519 stage = tape->first_stage; 1520 tape->first_stage = stage->next; 1521 idetape_kfree_stage (tape, stage); 1522 tape->nr_stages--; 1523 if (tape->first_stage == NULL) { 1524 tape->last_stage = NULL; 1525#if IDETAPE_DEBUG_BUGS 1526 if (tape->next_stage != NULL) 1527 printk (KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); 1528 if (tape->nr_stages) 1529 printk (KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); 1530#endif /* IDETAPE_DEBUG_BUGS */ 1531 } 1532} 1533 1534/* 1535 * idetape_end_request is used to finish servicing a request, and to 1536 * insert a pending pipeline request into the main device queue. 1537 */ 1538static void idetape_end_request (byte uptodate, ide_hwgroup_t *hwgroup) 1539{ 1540 ide_drive_t *drive = hwgroup->drive; 1541 struct request *rq = hwgroup->rq; 1542 idetape_tape_t *tape = drive->driver_data; 1543 unsigned long flags; 1544 int error; 1545 int remove_stage = 0; 1546#if ONSTREAM_DEBUG 1547 idetape_stage_t *stage; 1548 os_aux_t *aux; 1549 unsigned char *p; 1550#endif 1551 1552#if IDETAPE_DEBUG_LOG 1553 if (tape->debug_level >= 4) 1554 printk (KERN_INFO "ide-tape: Reached idetape_end_request\n"); 1555#endif /* IDETAPE_DEBUG_LOG */ 1556 1557 switch (uptodate) { 1558 case 0: error = IDETAPE_ERROR_GENERAL; break; 1559 case 1: error = 0; break; 1560 default: error = uptodate; 1561 } 1562 rq->errors = error; 1563 if (error) 1564 tape->failed_pc = NULL; 1565 1566 spin_lock_irqsave(&tape->spinlock, flags); 1567 if (tape->active_data_request == rq) { /* The request was a pipelined data transfer request */ 1568 tape->active_stage = NULL; 1569 tape->active_data_request = NULL; 1570 tape->nr_pending_stages--; 1571 if (rq->cmd == IDETAPE_WRITE_RQ) { 1572#if ONSTREAM_DEBUG 1573 if (tape->debug_level >= 2) { 1574 if (tape->onstream) { 1575 stage = tape->first_stage; 1576 aux = stage->aux; 1577 p = stage->bh->b_data; 1578 if (ntohl(aux->logical_blk_num) < 11300 && ntohl(aux->logical_blk_num) > 11100) 1579 printk(KERN_INFO "ide-tape: finished writing logical blk %u (data %x %x %x %x)\n", ntohl(aux->logical_blk_num), *p++, *p++, *p++, *p++); 1580 } 1581 } 1582#endif 1583 if (tape->onstream && !tape->raw) { 1584 if (tape->first_frame_position == OS_DATA_ENDFRAME1) { 1585#if ONSTREAM_DEBUG 1586 if (tape->debug_level >= 2) 1587 printk("ide-tape: %s: skipping over config parition..\n", tape->name); 1588#endif 1589 tape->onstream_write_error = OS_PART_ERROR; 1590 if (tape->waiting) 1591 complete(tape->waiting); 1592 } 1593 } 1594 remove_stage = 1; 1595 if (error) { 1596 set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); 1597 if (error == IDETAPE_ERROR_EOD) 1598 idetape_abort_pipeline (drive); 1599 if (tape->onstream && !tape->raw && error == IDETAPE_ERROR_GENERAL && tape->sense.sense_key == 3) { 1600 clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); 1601 printk(KERN_ERR "ide-tape: %s: write error, enabling error recovery\n", tape->name); 1602 tape->onstream_write_error = OS_WRITE_ERROR; 1603 remove_stage = 0; 1604 tape->nr_pending_stages++; 1605 tape->next_stage = tape->first_stage; 1606 rq->current_nr_sectors = rq->nr_sectors; 1607 if (tape->waiting) 1608 complete(tape->waiting); 1609 } 1610 } 1611 } else if (rq->cmd == IDETAPE_READ_RQ) { 1612 if (error == IDETAPE_ERROR_EOD) { 1613 set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); 1614 idetape_abort_pipeline(drive); 1615 } 1616 } 1617 if (tape->next_stage != NULL && !tape->onstream_write_error) { 1618 idetape_active_next_stage (drive); 1619 1620 /* 1621 * Insert the next request into the request queue. 1622 */ 1623 (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end); 1624 } else if (!error) { 1625 if (!tape->onstream) 1626 idetape_increase_max_pipeline_stages (drive); 1627 } 1628 } 1629 ide_end_drive_cmd (drive, 0, 0); 1630 if (remove_stage) 1631 idetape_remove_stage_head (drive); 1632 if (tape->active_data_request == NULL) 1633 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 1634 spin_unlock_irqrestore(&tape->spinlock, flags); 1635} 1636 1637static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) 1638{ 1639 idetape_tape_t *tape = drive->driver_data; 1640 1641#if IDETAPE_DEBUG_LOG 1642 if (tape->debug_level >= 4) 1643 printk (KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); 1644#endif /* IDETAPE_DEBUG_LOG */ 1645 if (!tape->pc->error) { 1646 idetape_analyze_error (drive, (idetape_request_sense_result_t *) tape->pc->buffer); 1647 idetape_end_request (1, HWGROUP (drive)); 1648 } else { 1649 printk (KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); 1650 idetape_end_request (0, HWGROUP (drive)); 1651 } 1652 return ide_stopped; 1653} 1654 1655static void idetape_create_request_sense_cmd (idetape_pc_t *pc) 1656{ 1657 idetape_init_pc (pc); 1658 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; 1659 pc->c[4] = 20; 1660 pc->request_transfer = 18; 1661 pc->callback = &idetape_request_sense_callback; 1662} 1663 1664/* 1665 * idetape_queue_pc_head generates a new packet command request in front 1666 * of the request queue, before the current request, so that it will be 1667 * processed immediately, on the next pass through the driver. 1668 * 1669 * idetape_queue_pc_head is called from the request handling part of 1670 * the driver (the "bottom" part). Safe storage for the request should 1671 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage 1672 * before calling idetape_queue_pc_head. 1673 * 1674 * Memory for those requests is pre-allocated at initialization time, and 1675 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough 1676 * space for the maximum possible number of inter-dependent packet commands. 1677 * 1678 * The higher level of the driver - The ioctl handler and the character 1679 * device handling functions should queue request to the lower level part 1680 * and wait for their completion using idetape_queue_pc_tail or 1681 * idetape_queue_rw_tail. 1682 */ 1683static void idetape_queue_pc_head (ide_drive_t *drive,idetape_pc_t *pc,struct request *rq) 1684{ 1685 ide_init_drive_cmd (rq); 1686 rq->buffer = (char *) pc; 1687 rq->cmd = IDETAPE_PC_RQ1; 1688 (void) ide_do_drive_cmd (drive, rq, ide_preempt); 1689} 1690 1691/* 1692 * idetape_retry_pc is called when an error was detected during the 1693 * last packet command. We queue a request sense packet command in 1694 * the head of the request list. 1695 */ 1696static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) 1697{ 1698 idetape_tape_t *tape = drive->driver_data; 1699 idetape_pc_t *pc; 1700 struct request *rq; 1701 idetape_error_reg_t error; 1702 1703 error.all = IN_BYTE (IDE_ERROR_REG); 1704 pc = idetape_next_pc_storage (drive); 1705 rq = idetape_next_rq_storage (drive); 1706 idetape_create_request_sense_cmd (pc); 1707 set_bit (IDETAPE_IGNORE_DSC, &tape->flags); 1708 idetape_queue_pc_head (drive, pc, rq); 1709 return ide_stopped; 1710} 1711 1712/* 1713 * idetape_postpone_request postpones the current request so that 1714 * ide.c will be able to service requests from another device on 1715 * the same hwgroup while we are polling for DSC. 1716 */ 1717static void idetape_postpone_request (ide_drive_t *drive) 1718{ 1719 idetape_tape_t *tape = drive->driver_data; 1720 1721#if IDETAPE_DEBUG_LOG 1722 if (tape->debug_level >= 4) 1723 printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); 1724#endif 1725 tape->postponed_rq = HWGROUP(drive)->rq; 1726 ide_stall_queue(drive, tape->dsc_polling_frequency); 1727} 1728 1729/* 1730 * idetape_pc_intr is the usual interrupt handler which will be called 1731 * during a packet command. We will transfer some of the data (as 1732 * requested by the drive) and will re-point interrupt handler to us. 1733 * When data transfer is finished, we will act according to the 1734 * algorithm described before idetape_issue_packet_command. 1735 * 1736 */ 1737static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) 1738{ 1739 idetape_tape_t *tape = drive->driver_data; 1740 idetape_status_reg_t status; 1741 idetape_bcount_reg_t bcount; 1742 idetape_ireason_reg_t ireason; 1743 idetape_pc_t *pc = tape->pc; 1744 1745 unsigned int temp; 1746 unsigned long cmd_time; 1747#if SIMULATE_ERRORS 1748 static int error_sim_count = 0; 1749#endif 1750 1751#if IDETAPE_DEBUG_LOG 1752 if (tape->debug_level >= 4) 1753 printk (KERN_INFO "ide-tape: Reached idetape_pc_intr interrupt handler\n"); 1754#endif /* IDETAPE_DEBUG_LOG */ 1755 1756 status.all = GET_STAT(); /* Clear the interrupt */ 1757 1758#ifdef CONFIG_BLK_DEV_IDEDMA 1759 if (test_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { 1760 if (HWIF(drive)->dmaproc(ide_dma_end, drive)) { 1761 /* 1762 * A DMA error is sometimes expected. For example, 1763 * if the tape is crossing a filemark during a 1764 * READ command, it will issue an irq and position 1765 * itself before the filemark, so that only a partial 1766 * data transfer will occur (which causes the DMA 1767 * error). In that case, we will later ask the tape 1768 * how much bytes of the original request were 1769 * actually transferred (we can't receive that 1770 * information from the DMA engine on most chipsets). 1771 */ 1772 set_bit (PC_DMA_ERROR, &pc->flags); 1773 } else if (!status.b.check) { 1774 pc->actually_transferred = pc->request_transfer; 1775 idetape_update_buffers (pc); 1776 } 1777#if IDETAPE_DEBUG_LOG 1778 if (tape->debug_level >= 4) 1779 printk (KERN_INFO "ide-tape: DMA finished\n"); 1780#endif /* IDETAPE_DEBUG_LOG */ 1781 } 1782#endif /* CONFIG_BLK_DEV_IDEDMA */ 1783 1784 if (!status.b.drq) { /* No more interrupts */ 1785 cmd_time = (jiffies - tape->cmd_start_time) * 1000 / HZ; 1786 tape->max_cmd_time = IDE_MAX(cmd_time, tape->max_cmd_time); 1787#if IDETAPE_DEBUG_LOG 1788 if (tape->debug_level >= 2) 1789 printk (KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); 1790#endif /* IDETAPE_DEBUG_LOG */ 1791 clear_bit (PC_DMA_IN_PROGRESS, &pc->flags); 1792 1793 ide__sti(); /* local CPU only */ 1794 1795#if SIMULATE_ERRORS 1796 if ((pc->c[0] == IDETAPE_WRITE_CMD || pc->c[0] == IDETAPE_READ_CMD) && (++error_sim_count % 100) == 0) { 1797 printk(KERN_INFO "ide-tape: %s: simulating error\n", tape->name); 1798 status.b.check = 1; 1799 } 1800#endif 1801 if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) 1802 status.b.check = 0; 1803 if (status.b.check || test_bit (PC_DMA_ERROR, &pc->flags)) { /* Error detected */ 1804#if IDETAPE_DEBUG_LOG 1805 if (tape->debug_level >= 1) 1806 printk (KERN_INFO "ide-tape: %s: I/O error, ",tape->name); 1807#endif /* IDETAPE_DEBUG_LOG */ 1808 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1809 printk (KERN_ERR "ide-tape: I/O error in request sense command\n"); 1810 return ide_do_reset (drive); 1811 } 1812#if IDETAPE_DEBUG_LOG 1813 if (tape->debug_level >= 1) 1814 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); 1815#endif 1816 return idetape_retry_pc (drive); /* Retry operation */ 1817 } 1818 pc->error = 0; 1819 if (!tape->onstream && test_bit (PC_WAIT_FOR_DSC, &pc->flags) && !status.b.dsc) { /* Media access command */ 1820 tape->dsc_polling_start = jiffies; 1821 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; 1822 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 1823 idetape_postpone_request (drive); /* Allow ide.c to handle other requests */ 1824 return ide_stopped; 1825 } 1826 if (tape->failed_pc == pc) 1827 tape->failed_pc = NULL; 1828 return pc->callback(drive); /* Command finished - Call the callback function */ 1829 } 1830#ifdef CONFIG_BLK_DEV_IDEDMA 1831 if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { 1832 printk (KERN_ERR "ide-tape: The tape wants to issue more interrupts in DMA mode\n"); 1833 printk (KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); 1834 (void) HWIF(drive)->dmaproc(ide_dma_off, drive); 1835 return ide_do_reset (drive); 1836 } 1837#endif /* CONFIG_BLK_DEV_IDEDMA */ 1838 bcount.b.high = IN_BYTE (IDE_BCOUNTH_REG); /* Get the number of bytes to transfer */ 1839 bcount.b.low = IN_BYTE (IDE_BCOUNTL_REG); /* on this interrupt */ 1840 ireason.all = IN_BYTE (IDE_IREASON_REG); 1841 1842 if (ireason.b.cod) { 1843 printk (KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); 1844 return ide_do_reset (drive); 1845 } 1846 if (ireason.b.io == test_bit (PC_WRITING, &pc->flags)) { /* Hopefully, we will never get here */ 1847 printk (KERN_ERR "ide-tape: We wanted to %s, ", ireason.b.io ? "Write":"Read"); 1848 printk (KERN_ERR "ide-tape: but the tape wants us to %s !\n",ireason.b.io ? "Read":"Write"); 1849 return ide_do_reset (drive); 1850 } 1851 if (!test_bit (PC_WRITING, &pc->flags)) { /* Reading - Check that we have enough space */ 1852 temp = pc->actually_transferred + bcount.all; 1853 if ( temp > pc->request_transfer) { 1854 if (temp > pc->buffer_size) { 1855 printk (KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); 1856 idetape_discard_data (drive, bcount.all); 1857 ide_set_handler (drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1858 return ide_started; 1859 } 1860#if IDETAPE_DEBUG_LOG 1861 if (tape->debug_level >= 2) 1862 printk (KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); 1863#endif /* IDETAPE_DEBUG_LOG */ 1864 } 1865 } 1866 if (test_bit (PC_WRITING, &pc->flags)) { 1867 if (pc->bh != NULL) 1868 idetape_output_buffers (drive, pc, bcount.all); 1869 else 1870 atapi_output_bytes (drive,pc->current_position,bcount.all); /* Write the current buffer */ 1871 } else { 1872 if (pc->bh != NULL) 1873 idetape_input_buffers (drive, pc, bcount.all); 1874 else 1875 atapi_input_bytes (drive,pc->current_position,bcount.all); /* Read the current buffer */ 1876 } 1877 pc->actually_transferred += bcount.all; /* Update the current position */ 1878 pc->current_position+=bcount.all; 1879#if IDETAPE_DEBUG_LOG 1880 if (tape->debug_level >= 2) 1881 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all); 1882#endif 1883 ide_set_handler (drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); /* And set the interrupt handler again */ 1884 return ide_started; 1885} 1886 1887/* 1888 * Packet Command Interface 1889 * 1890 * The current Packet Command is available in tape->pc, and will not 1891 * change until we finish handling it. Each packet command is associated 1892 * with a callback function that will be called when the command is 1893 * finished. 1894 * 1895 * The handling will be done in three stages: 1896 * 1897 * 1. idetape_issue_packet_command will send the packet command to the 1898 * drive, and will set the interrupt handler to idetape_pc_intr. 1899 * 1900 * 2. On each interrupt, idetape_pc_intr will be called. This step 1901 * will be repeated until the device signals us that no more 1902 * interrupts will be issued. 1903 * 1904 * 3. ATAPI Tape media access commands have immediate status with a 1905 * delayed process. In case of a successful initiation of a 1906 * media access packet command, the DSC bit will be set when the 1907 * actual execution of the command is finished. 1908 * Since the tape drive will not issue an interrupt, we have to 1909 * poll for this event. In this case, we define the request as 1910 * "low priority request" by setting rq_status to 1911 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit 1912 * the driver. 1913 * 1914 * ide.c will then give higher priority to requests which 1915 * originate from the other device, until will change rq_status 1916 * to RQ_ACTIVE. 1917 * 1918 * 4. When the packet command is finished, it will be checked for errors. 1919 * 1920 * 5. In case an error was found, we queue a request sense packet command 1921 * in front of the request queue and retry the operation up to 1922 * IDETAPE_MAX_PC_RETRIES times. 1923 * 1924 * 6. In case no error was found, or we decided to give up and not 1925 * to retry again, the callback function will be called and then 1926 * we will handle the next request. 1927 * 1928 */ 1929static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 1930{ 1931 idetape_tape_t *tape = drive->driver_data; 1932 idetape_pc_t *pc = tape->pc; 1933 idetape_ireason_reg_t ireason; 1934 int retries = 100; 1935 ide_startstop_t startstop; 1936 1937 if (ide_wait_stat (&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { 1938 printk (KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); 1939 return startstop; 1940 } 1941 ireason.all = IN_BYTE (IDE_IREASON_REG); 1942 while (retries-- && (!ireason.b.cod || ireason.b.io)) { 1943 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, retrying\n"); 1944 udelay(100); 1945 ireason.all = IN_BYTE(IDE_IREASON_REG); 1946 if (retries == 0) { 1947 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, ignoring\n"); 1948 ireason.b.cod = 1; 1949 ireason.b.io = 0; 1950 } 1951 } 1952 if (!ireason.b.cod || ireason.b.io) { 1953 printk (KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing a packet command\n"); 1954 return ide_do_reset (drive); 1955 } 1956 tape->cmd_start_time = jiffies; 1957 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); /* Set the interrupt routine */ 1958 atapi_output_bytes (drive,pc->c,12); /* Send the actual packet */ 1959 return ide_started; 1960} 1961 1962static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) 1963{ 1964 idetape_tape_t *tape = drive->driver_data; 1965 idetape_bcount_reg_t bcount; 1966 int dma_ok = 0; 1967 1968#if IDETAPE_DEBUG_BUGS 1969 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1970 printk (KERN_ERR "ide-tape: possible ide-tape.c bug - Two request sense in serial were issued\n"); 1971 } 1972#endif /* IDETAPE_DEBUG_BUGS */ 1973 1974 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) 1975 tape->failed_pc = pc; 1976 tape->pc = pc; /* Set the current packet command */ 1977 1978 if (pc->retries > IDETAPE_MAX_PC_RETRIES || test_bit (PC_ABORT, &pc->flags)) { 1979 /* 1980 * We will "abort" retrying a packet command in case 1981 * a legitimate error code was received (crossing a 1982 * filemark, or DMA error in the end of media, for 1983 * example). 1984 */ 1985 if (!test_bit (PC_ABORT, &pc->flags)) { 1986 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && tape->sense_key == 2 && 1987 tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) { 1988 printk (KERN_ERR "ide-tape: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n", 1989 tape->name, pc->c[0], tape->sense_key, tape->asc, tape->ascq); 1990 if (tape->onstream && pc->c[0] == IDETAPE_READ_CMD && tape->sense_key == 3 && tape->asc == 0x11) /* AJN-1: 11 should be 0x11 */ 1991 printk(KERN_ERR "ide-tape: %s: enabling read error recovery\n", tape->name); 1992 } 1993 pc->error = IDETAPE_ERROR_GENERAL; /* Giving up */ 1994 } 1995 tape->failed_pc = NULL; 1996 return pc->callback(drive); 1997 } 1998#if IDETAPE_DEBUG_LOG 1999 if (tape->debug_level >= 2) 2000 printk (KERN_INFO "ide-tape: Retry number - %d\n", pc->retries); 2001#endif /* IDETAPE_DEBUG_LOG */ 2002 2003 pc->retries++; 2004 pc->actually_transferred = 0; /* We haven't transferred any data yet */ 2005 pc->current_position=pc->buffer; 2006 bcount.all=pc->request_transfer; /* Request to transfer the entire buffer at once */ 2007 2008#ifdef CONFIG_BLK_DEV_IDEDMA 2009 if (test_and_clear_bit (PC_DMA_ERROR, &pc->flags)) { 2010 printk (KERN_WARNING "ide-tape: DMA disabled, reverting to PIO\n"); 2011 (void) HWIF(drive)->dmaproc(ide_dma_off, drive); 2012 } 2013 if (test_bit (PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) 2014 dma_ok = !HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive); 2015#endif /* CONFIG_BLK_DEV_IDEDMA */ 2016 2017 if (IDE_CONTROL_REG) 2018 OUT_BYTE (drive->ctl, IDE_CONTROL_REG); 2019 OUT_BYTE (dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */ 2020 OUT_BYTE (bcount.b.high, IDE_BCOUNTH_REG); 2021 OUT_BYTE (bcount.b.low, IDE_BCOUNTL_REG); 2022 OUT_BYTE (drive->select.all, IDE_SELECT_REG); 2023#ifdef CONFIG_BLK_DEV_IDEDMA 2024 if (dma_ok) { /* Begin DMA, if necessary */ 2025 set_bit (PC_DMA_IN_PROGRESS, &pc->flags); 2026 (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive)); 2027 } 2028#endif /* CONFIG_BLK_DEV_IDEDMA */ 2029 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { 2030 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); 2031 OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG); 2032 return ide_started; 2033 } else { 2034 OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG); 2035 return idetape_transfer_pc(drive); 2036 } 2037} 2038 2039/* 2040 * General packet command callback function. 2041 */ 2042static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) 2043{ 2044 idetape_tape_t *tape = drive->driver_data; 2045 2046#if IDETAPE_DEBUG_LOG 2047 if (tape->debug_level >= 4) 2048 printk (KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); 2049#endif /* IDETAPE_DEBUG_LOG */ 2050 2051 idetape_end_request (tape->pc->error ? 0 : 1, HWGROUP(drive)); 2052 return ide_stopped; 2053} 2054 2055/* 2056 * A mode sense command is used to "sense" tape parameters. 2057 */ 2058static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, byte page_code) 2059{ 2060 idetape_init_pc (pc); 2061 pc->c[0] = IDETAPE_MODE_SENSE_CMD; 2062 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 2063 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ 2064 pc->c[2] = page_code; 2065 pc->c[3] = 255; /* Don't limit the returned information */ 2066 pc->c[4] = 255; /* (We will just discard data in that case) */ 2067 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 2068 pc->request_transfer = 12; 2069 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 2070 pc->request_transfer = 24; 2071 else 2072 pc->request_transfer = 50; 2073 pc->callback = &idetape_pc_callback; 2074} 2075 2076static ide_startstop_t idetape_onstream_buffer_fill_callback (ide_drive_t *drive) 2077{ 2078 idetape_tape_t *tape = drive->driver_data; 2079 2080 tape->max_frames = tape->pc->buffer[4 + 2]; 2081 tape->cur_frames = tape->pc->buffer[4 + 3]; 2082 if (tape->chrdev_direction == idetape_direction_write) 2083 tape->tape_head = tape->buffer_head - tape->cur_frames; 2084 else 2085 tape->tape_head = tape->buffer_head + tape->cur_frames; 2086 if (tape->tape_head != tape->last_tape_head) { 2087 tape->last_tape_head = tape->tape_head; 2088 tape->tape_still_time_begin = jiffies; 2089 if (tape->tape_still_time > 200) 2090 tape->measure_insert_time = 1; 2091 } 2092 tape->tape_still_time = (jiffies - tape->tape_still_time_begin) * 1000 / HZ; 2093#if USE_IOTRACE 2094 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); 2095#endif 2096#if IDETAPE_DEBUG_LOG 2097 if (tape->debug_level >= 1) 2098 printk(KERN_INFO "ide-tape: buffer fill callback, %d/%d\n", tape->cur_frames, tape->max_frames); 2099#endif 2100 idetape_end_request (tape->pc->error ? 0 : 1, HWGROUP(drive)); 2101 return ide_stopped; 2102} 2103 2104static void idetape_queue_onstream_buffer_fill (ide_drive_t *drive) 2105{ 2106 idetape_pc_t *pc; 2107 struct request *rq; 2108 2109 pc = idetape_next_pc_storage (drive); 2110 rq = idetape_next_rq_storage (drive); 2111 idetape_create_mode_sense_cmd (pc, IDETAPE_BUFFER_FILLING_PAGE); 2112 pc->callback = idetape_onstream_buffer_fill_callback; 2113 idetape_queue_pc_head (drive, pc, rq); 2114} 2115 2116static void calculate_speeds(ide_drive_t *drive) 2117{ 2118 idetape_tape_t *tape = drive->driver_data; 2119 int full = 125, empty = 75; 2120 2121 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { 2122 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; 2123 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; 2124 tape->controlled_last_pipeline_head = tape->pipeline_head; 2125 tape->controlled_pipeline_head_time = jiffies; 2126 } 2127 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) 2128 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); 2129 else if (time_after(jiffies, tape->controlled_previous_head_time)) 2130 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); 2131 2132 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { /* -1 for read mode error recovery */ 2133 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { 2134 tape->uncontrolled_pipeline_head_time = jiffies; 2135 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); 2136 } 2137 } else { 2138 tape->uncontrolled_previous_head_time = jiffies; 2139 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; 2140 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { 2141 tape->uncontrolled_pipeline_head_time = jiffies; 2142 } 2143 } 2144 tape->pipeline_head_speed = IDE_MAX(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); 2145 if (tape->speed_control == 0) { 2146 tape->max_insert_speed = 5000; 2147 } else if (tape->speed_control == 1) { 2148 if (tape->nr_pending_stages >= tape->max_stages / 2) 2149 tape->max_insert_speed = tape->pipeline_head_speed + 2150 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; 2151 else 2152 tape->max_insert_speed = 500 + 2153 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; 2154 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) 2155 tape->max_insert_speed = 5000; 2156 } else if (tape->speed_control == 2) { 2157 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + 2158 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; 2159 } else 2160 tape->max_insert_speed = tape->speed_control; 2161 tape->max_insert_speed = IDE_MAX(tape->max_insert_speed, 500); 2162} 2163 2164static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) 2165{ 2166 idetape_tape_t *tape = drive->driver_data; 2167 idetape_pc_t *pc = tape->pc; 2168 idetape_status_reg_t status; 2169 2170 if (tape->onstream) 2171 printk(KERN_INFO "ide-tape: bug: onstream, media_access_finished\n"); 2172 status.all = GET_STAT(); 2173 if (status.b.dsc) { 2174 if (status.b.check) { /* Error detected */ 2175 printk (KERN_ERR "ide-tape: %s: I/O error, ",tape->name); 2176 return idetape_retry_pc (drive); /* Retry operation */ 2177 } 2178 pc->error = 0; 2179 if (tape->failed_pc == pc) 2180 tape->failed_pc = NULL; 2181 } else { 2182 pc->error = IDETAPE_ERROR_GENERAL; 2183 tape->failed_pc = NULL; 2184 } 2185 return pc->callback (drive); 2186} 2187 2188static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) 2189{ 2190 idetape_tape_t *tape = drive->driver_data; 2191 struct request *rq = HWGROUP(drive)->rq; 2192 int blocks = tape->pc->actually_transferred / tape->tape_block_size; 2193 2194 tape->avg_size += blocks * tape->tape_block_size; 2195 tape->insert_size += blocks * tape->tape_block_size; 2196 if (tape->insert_size > 1024 * 1024) 2197 tape->measure_insert_time = 1; 2198 if (tape->measure_insert_time) { 2199 tape->measure_insert_time = 0; 2200 tape->insert_time = jiffies; 2201 tape->insert_size = 0; 2202 } 2203 if (time_after(jiffies, tape->insert_time)) 2204 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2205 if (jiffies - tape->avg_time >= HZ) { 2206 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; 2207 tape->avg_size = 0; 2208 tape->avg_time = jiffies; 2209 } 2210 2211#if IDETAPE_DEBUG_LOG 2212 if (tape->debug_level >= 4) 2213 printk (KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); 2214#endif /* IDETAPE_DEBUG_LOG */ 2215 2216 tape->first_frame_position += blocks; 2217 rq->current_nr_sectors -= blocks; 2218 2219 if (!tape->pc->error) 2220 idetape_end_request (1, HWGROUP (drive)); 2221 else 2222 idetape_end_request (tape->pc->error, HWGROUP (drive)); 2223 return ide_stopped; 2224} 2225 2226static void idetape_create_read_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh) 2227{ 2228 struct buffer_head *p = bh; 2229 idetape_init_pc (pc); 2230 pc->c[0] = IDETAPE_READ_CMD; 2231 put_unaligned (htonl (length), (unsigned int *) &pc->c[1]); 2232 pc->c[1] = 1; 2233 pc->callback = &idetape_rw_callback; 2234 pc->bh = bh; 2235 atomic_set(&bh->b_count, 0); 2236 pc->buffer = NULL; 2237 if (tape->onstream) { 2238 while (p) { 2239 atomic_set(&p->b_count, 0); 2240 p = p->b_reqnext; 2241 } 2242 } 2243 if (!tape->onstream) { 2244 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 2245 if (pc->request_transfer == tape->stage_size) 2246 set_bit (PC_DMA_RECOMMENDED, &pc->flags); 2247 } else { 2248 if (length) { 2249 pc->request_transfer = pc->buffer_size = 32768 + 512; 2250 set_bit (PC_DMA_RECOMMENDED, &pc->flags); 2251 } else 2252 pc->request_transfer = 0; 2253 } 2254} 2255 2256static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh) 2257{ 2258 int size = 32768; 2259 2260 struct buffer_head *p = bh; 2261 idetape_init_pc (pc); 2262 pc->c[0] = IDETAPE_READ_BUFFER_CMD; 2263 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; 2264 pc->c[7] = size >> 8; 2265 pc->c[8] = size & 0xff; 2266 pc->callback = &idetape_pc_callback; 2267 pc->bh = bh; 2268 atomic_set(&bh->b_count, 0); 2269 pc->buffer = NULL; 2270 while (p) { 2271 atomic_set(&p->b_count, 0); 2272 p = p->b_reqnext; 2273 } 2274 pc->request_transfer = pc->buffer_size = size; 2275} 2276 2277static void idetape_create_write_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct buffer_head *bh) 2278{ 2279 struct buffer_head *p = bh; 2280 idetape_init_pc (pc); 2281 pc->c[0] = IDETAPE_WRITE_CMD; 2282 put_unaligned (htonl (length), (unsigned int *) &pc->c[1]); 2283 pc->c[1] = 1; 2284 pc->callback = &idetape_rw_callback; 2285 set_bit (PC_WRITING, &pc->flags); 2286 if (tape->onstream) { 2287 while (p) { 2288 atomic_set(&p->b_count, p->b_size); 2289 p = p->b_reqnext; 2290 } 2291 } 2292 pc->bh = bh; 2293 pc->b_data = bh->b_data; 2294 pc->b_count = atomic_read(&bh->b_count); 2295 pc->buffer = NULL; 2296 if (!tape->onstream) { 2297 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 2298 if (pc->request_transfer == tape->stage_size) 2299 set_bit (PC_DMA_RECOMMENDED, &pc->flags); 2300 } else { 2301 if (length) { 2302 pc->request_transfer = pc->buffer_size = 32768 + 512; 2303 set_bit (PC_DMA_RECOMMENDED, &pc->flags); 2304 } else 2305 pc->request_transfer = 0; 2306 } 2307} 2308 2309/* 2310 * idetape_do_request is our request handling function. 2311 */ 2312static ide_startstop_t idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block) 2313{ 2314 idetape_tape_t *tape = drive->driver_data; 2315 idetape_pc_t *pc; 2316 struct request *postponed_rq = tape->postponed_rq; 2317 idetape_status_reg_t status; 2318 2319#if IDETAPE_DEBUG_LOG 2320 if (tape->debug_level >= 5) 2321 printk (KERN_INFO "ide-tape: rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors); 2322 if (tape->debug_level >= 2) 2323 printk (KERN_INFO "ide-tape: sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); 2324#endif /* IDETAPE_DEBUG_LOG */ 2325 2326 if (!IDETAPE_RQ_CMD (rq->cmd)) { 2327 /* 2328 * We do not support buffer cache originated requests. 2329 */ 2330 printk (KERN_NOTICE "ide-tape: %s: Unsupported command in request queue (%d)\n", drive->name, rq->cmd); 2331 ide_end_request (0, HWGROUP (drive)); /* Let the common code handle it */ 2332 return ide_stopped; 2333 } 2334 2335 /* 2336 * Retry a failed packet command 2337 */ 2338 if (tape->failed_pc != NULL && tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 2339 return idetape_issue_packet_command (drive, tape->failed_pc); 2340 } 2341#if IDETAPE_DEBUG_BUGS 2342 if (postponed_rq != NULL) 2343 if (rq != postponed_rq) { 2344 printk (KERN_ERR "ide-tape: ide-tape.c bug - Two DSC requests were queued\n"); 2345 idetape_end_request (0, HWGROUP (drive)); 2346 return ide_stopped; 2347 } 2348#endif /* IDETAPE_DEBUG_BUGS */ 2349 2350 tape->postponed_rq = NULL; 2351 2352 /* 2353 * If the tape is still busy, postpone our request and service 2354 * the other device meanwhile. 2355 */ 2356 status.all = GET_STAT(); 2357 2358 /* 2359 * The OnStream tape drive doesn't support DSC. Assume 2360 * that DSC is always set. 2361 */ 2362 if (tape->onstream) 2363 status.b.dsc = 1; 2364 if (!drive->dsc_overlap && rq->cmd != IDETAPE_PC_RQ2) 2365 set_bit (IDETAPE_IGNORE_DSC, &tape->flags); 2366 2367 /* 2368 * For the OnStream tape, check the current status of the tape 2369 * internal buffer using data gathered from the buffer fill 2370 * mode page, and postpone our request, effectively "disconnecting" 2371 * from the IDE bus, in case the buffer is full (writing) or 2372 * empty (reading), and there is a danger that our request will 2373 * hold the IDE bus during actual media access. 2374 */ 2375 if (tape->tape_still_time > 100 && tape->tape_still_time < 200) 2376 tape->measure_insert_time = 1; 2377 if (tape->req_buffer_fill && (rq->cmd == IDETAPE_WRITE_RQ || rq->cmd == IDETAPE_READ_RQ)) { 2378 tape->req_buffer_fill = 0; 2379 tape->writes_since_buffer_fill = 0; 2380 tape->reads_since_buffer_fill = 0; 2381 tape->last_buffer_fill = jiffies; 2382 idetape_queue_onstream_buffer_fill(drive); 2383 if (time_after(jiffies, tape->insert_time)) 2384 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2385 return ide_stopped; 2386 } 2387 if (time_after(jiffies, tape->insert_time)) 2388 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2389 calculate_speeds(drive); 2390 if (tape->onstream && tape->max_frames && 2391 ((rq->cmd == IDETAPE_WRITE_RQ && 2392 ( tape->cur_frames == tape->max_frames || 2393 ( tape->speed_control && tape->cur_frames > 5 && 2394 (tape->insert_speed > tape->max_insert_speed || 2395 (0 /* tape->cur_frames > 30 && tape->tape_still_time > 200 */) ) ) ) ) || 2396 (rq->cmd == IDETAPE_READ_RQ && 2397 ( tape->cur_frames == 0 || 2398 ( tape->speed_control && (tape->cur_frames < tape->max_frames - 5) && 2399 tape->insert_speed > tape->max_insert_speed ) ) && rq->nr_sectors) ) ) { 2400#if IDETAPE_DEBUG_LOG 2401 if (tape->debug_level >= 4) 2402 printk(KERN_INFO "ide-tape: postponing request, cmd %d, cur %d, max %d\n", 2403 rq->cmd, tape->cur_frames, tape->max_frames); 2404#endif 2405 if (tape->postpone_cnt++ < 500) { 2406 status.b.dsc = 0; 2407 tape->req_buffer_fill = 1; 2408 } 2409#if ONSTREAM_DEBUG 2410 else if (tape->debug_level >= 4) 2411 printk(KERN_INFO "ide-tape: %s: postpone_cnt %d\n", tape->name, tape->postpone_cnt); 2412#endif 2413 } 2414 if (!test_and_clear_bit (IDETAPE_IGNORE_DSC, &tape->flags) && !status.b.dsc) { 2415 if (postponed_rq == NULL) { 2416 tape->dsc_polling_start = jiffies; 2417 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; 2418 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 2419 } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) { 2420 printk (KERN_ERR "ide-tape: %s: DSC timeout\n", tape->name); 2421 if (rq->cmd == IDETAPE_PC_RQ2) { 2422 idetape_media_access_finished (drive); 2423 return ide_stopped; 2424 } else { 2425 return ide_do_reset (drive); 2426 } 2427 } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD) 2428 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; 2429 idetape_postpone_request (drive); 2430 return ide_stopped; 2431 } 2432 switch (rq->cmd) { 2433 case IDETAPE_READ_RQ: 2434 tape->buffer_head++; 2435#if USE_IOTRACE 2436 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); 2437#endif 2438 tape->postpone_cnt = 0; 2439 tape->reads_since_buffer_fill++; 2440 if (tape->onstream) { 2441 if (tape->cur_frames - tape->reads_since_buffer_fill <= 0) 2442 tape->req_buffer_fill = 1; 2443 if (time_after(jiffies, tape->last_buffer_fill + 5 * HZ / 100)) 2444 tape->req_buffer_fill = 1; 2445 } 2446 pc = idetape_next_pc_storage (drive); 2447 idetape_create_read_cmd (tape, pc, rq->current_nr_sectors, rq->bh); 2448 break; 2449 case IDETAPE_WRITE_RQ: 2450 tape->buffer_head++; 2451#if USE_IOTRACE 2452 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); 2453#endif 2454 tape->postpone_cnt = 0; 2455 tape->writes_since_buffer_fill++; 2456 if (tape->onstream) { 2457 if (tape->cur_frames + tape->writes_since_buffer_fill >= tape->max_frames) 2458 tape->req_buffer_fill = 1; 2459 if (time_after(jiffies, tape->last_buffer_fill + 5 * HZ / 100)) 2460 tape->req_buffer_fill = 1; 2461 calculate_speeds(drive); 2462 } 2463 pc = idetape_next_pc_storage (drive); 2464 idetape_create_write_cmd (tape, pc, rq->current_nr_sectors, rq->bh); 2465 break; 2466 case IDETAPE_READ_BUFFER_RQ: 2467 tape->postpone_cnt = 0; 2468 pc = idetape_next_pc_storage (drive); 2469 idetape_create_read_buffer_cmd (tape, pc, rq->current_nr_sectors, rq->bh); 2470 break; 2471 case IDETAPE_ABORTED_WRITE_RQ: 2472 rq->cmd = IDETAPE_WRITE_RQ; 2473 idetape_end_request (IDETAPE_ERROR_EOD, HWGROUP(drive)); 2474 return ide_stopped; 2475 case IDETAPE_ABORTED_READ_RQ: 2476#if IDETAPE_DEBUG_LOG 2477 if (tape->debug_level >= 2) 2478 printk(KERN_INFO "ide-tape: %s: detected aborted read rq\n", tape->name); 2479#endif 2480 rq->cmd = IDETAPE_READ_RQ; 2481 idetape_end_request (IDETAPE_ERROR_EOD, HWGROUP(drive)); 2482 return ide_stopped; 2483 case IDETAPE_PC_RQ1: 2484 pc = (idetape_pc_t *) rq->buffer; 2485 rq->cmd = IDETAPE_PC_RQ2; 2486 break; 2487 case IDETAPE_PC_RQ2: 2488 idetape_media_access_finished (drive); 2489 return ide_stopped; 2490 default: 2491 printk (KERN_ERR "ide-tape: bug in IDETAPE_RQ_CMD macro\n"); 2492 idetape_end_request (0, HWGROUP (drive)); 2493 return ide_stopped; 2494 } 2495 return idetape_issue_packet_command (drive, pc); 2496} 2497 2498/* 2499 * Pipeline related functions 2500 */ 2501static inline int idetape_pipeline_active (idetape_tape_t *tape) 2502{ 2503 int rc1, rc2; 2504 2505 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2506 rc2 = (tape->active_data_request != NULL); 2507 return rc1; 2508} 2509 2510/* 2511 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline 2512 * stage, along with all the necessary small buffers which together make 2513 * a buffer of size tape->stage_size (or a bit more). We attempt to 2514 * combine sequential pages as much as possible. 2515 * 2516 * Returns a pointer to the new allocated stage, or NULL if we 2517 * can't (or don't want to) allocate a stage. 2518 * 2519 * Pipeline stages are optional and are used to increase performance. 2520 * If we can't allocate them, we'll manage without them. 2521 */ 2522static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) 2523{ 2524 idetape_stage_t *stage; 2525 struct buffer_head *prev_bh, *bh; 2526 int pages = tape->pages_per_stage; 2527 char *b_data; 2528 2529 if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) 2530 return NULL; 2531 stage->next = NULL; 2532 2533 bh = stage->bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL); 2534 if (bh == NULL) 2535 goto abort; 2536 bh->b_reqnext = NULL; 2537 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2538 goto abort; 2539 if (clear) 2540 memset(bh->b_data, 0, PAGE_SIZE); 2541 bh->b_size = PAGE_SIZE; 2542 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2543 set_bit (BH_Lock, &bh->b_state); 2544 2545 while (--pages) { 2546 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2547 goto abort; 2548 if (clear) 2549 memset(b_data, 0, PAGE_SIZE); 2550 if (bh->b_data == b_data + PAGE_SIZE) { 2551 bh->b_size += PAGE_SIZE; 2552 bh->b_data -= PAGE_SIZE; 2553 if (full) 2554 atomic_add(PAGE_SIZE, &bh->b_count); 2555 continue; 2556 } 2557 if (b_data == bh->b_data + bh->b_size) { 2558 bh->b_size += PAGE_SIZE; 2559 if (full) 2560 atomic_add(PAGE_SIZE, &bh->b_count); 2561 continue; 2562 } 2563 prev_bh = bh; 2564 if ((bh = (struct buffer_head *) kmalloc (sizeof (struct buffer_head), GFP_KERNEL)) == NULL) { 2565 free_page ((unsigned long) b_data); 2566 goto abort; 2567 } 2568 bh->b_reqnext = NULL; 2569 bh->b_data = b_data; 2570 bh->b_size = PAGE_SIZE; 2571 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2572 set_bit (BH_Lock, &bh->b_state); 2573 prev_bh->b_reqnext = bh; 2574 } 2575 bh->b_size -= tape->excess_bh_size; 2576 if (full) 2577 atomic_sub(tape->excess_bh_size, &bh->b_count); 2578 if (tape->onstream) 2579 stage->aux = (os_aux_t *) (bh->b_data + bh->b_size - OS_AUX_SIZE); 2580 return stage; 2581abort: 2582 __idetape_kfree_stage (stage); 2583 return NULL; 2584} 2585 2586static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) 2587{ 2588 idetape_stage_t *cache_stage = tape->cache_stage; 2589 2590#if IDETAPE_DEBUG_LOG 2591 if (tape->debug_level >= 4) 2592 printk (KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); 2593#endif /* IDETAPE_DEBUG_LOG */ 2594 2595 if (tape->nr_stages >= tape->max_stages) 2596 return NULL; 2597 if (cache_stage != NULL) { 2598 tape->cache_stage = NULL; 2599 return cache_stage; 2600 } 2601 return __idetape_kmalloc_stage (tape, 0, 0); 2602} 2603 2604static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char *buf, int n) 2605{ 2606 struct buffer_head *bh = tape->bh; 2607 int count; 2608 2609 while (n) { 2610#if IDETAPE_DEBUG_BUGS 2611 if (bh == NULL) { 2612 printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_from_user\n"); 2613 return; 2614 } 2615#endif /* IDETAPE_DEBUG_BUGS */ 2616 count = IDE_MIN (bh->b_size - atomic_read(&bh->b_count), n); 2617 copy_from_user (bh->b_data + atomic_read(&bh->b_count), buf, count); 2618 n -= count; 2619 atomic_add(count, &bh->b_count); 2620 buf += count; 2621 if (atomic_read(&bh->b_count) == bh->b_size) { 2622 bh = bh->b_reqnext; 2623 if (bh) 2624 atomic_set(&bh->b_count, 0); 2625 } 2626 } 2627 tape->bh = bh; 2628} 2629 2630static void idetape_copy_stage_to_user (idetape_tape_t *tape, char *buf, idetape_stage_t *stage, int n) 2631{ 2632 struct buffer_head *bh = tape->bh; 2633 int count; 2634 2635 while (n) { 2636#if IDETAPE_DEBUG_BUGS 2637 if (bh == NULL) { 2638 printk (KERN_ERR "ide-tape: bh == NULL in idetape_copy_stage_to_user\n"); 2639 return; 2640 } 2641#endif /* IDETAPE_DEBUG_BUGS */ 2642 count = IDE_MIN (tape->b_count, n); 2643 copy_to_user (buf, tape->b_data, count); 2644 n -= count; 2645 tape->b_data += count; 2646 tape->b_count -= count; 2647 buf += count; 2648 if (!tape->b_count) { 2649 tape->bh = bh = bh->b_reqnext; 2650 if (bh) { 2651 tape->b_data = bh->b_data; 2652 tape->b_count = atomic_read(&bh->b_count); 2653 } 2654 } 2655 } 2656} 2657 2658static void idetape_init_merge_stage (idetape_tape_t *tape) 2659{ 2660 struct buffer_head *bh = tape->merge_stage->bh; 2661 2662 tape->bh = bh; 2663 if (tape->chrdev_direction == idetape_direction_write) 2664 atomic_set(&bh->b_count, 0); 2665 else { 2666 tape->b_data = bh->b_data; 2667 tape->b_count = atomic_read(&bh->b_count); 2668 } 2669} 2670 2671static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) 2672{ 2673 struct buffer_head *tmp; 2674 os_aux_t *tmp_aux; 2675 2676 tmp = stage->bh; tmp_aux = stage->aux; 2677 stage->bh = tape->merge_stage->bh; stage->aux = tape->merge_stage->aux; 2678 tape->merge_stage->bh = tmp; tape->merge_stage->aux = tmp_aux; 2679 idetape_init_merge_stage (tape); 2680} 2681 2682/* 2683 * idetape_add_stage_tail adds a new stage at the end of the pipeline. 2684 */ 2685static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) 2686{ 2687 idetape_tape_t *tape = drive->driver_data; 2688 unsigned long flags; 2689 2690#if IDETAPE_DEBUG_LOG 2691 if (tape->debug_level >= 4) 2692 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); 2693#endif /* IDETAPE_DEBUG_LOG */ 2694 spin_lock_irqsave(&tape->spinlock, flags); 2695 stage->next=NULL; 2696 if (tape->last_stage != NULL) 2697 tape->last_stage->next=stage; 2698 else 2699 tape->first_stage = tape->next_stage=stage; 2700 tape->last_stage = stage; 2701 if (tape->next_stage == NULL) 2702 tape->next_stage = tape->last_stage; 2703 tape->nr_stages++; 2704 tape->nr_pending_stages++; 2705 spin_unlock_irqrestore(&tape->spinlock, flags); 2706} 2707 2708/* 2709 * Initialize the OnStream AUX 2710 */ 2711static void idetape_init_stage (ide_drive_t *drive, idetape_stage_t *stage, int frame_type, int logical_blk_num) 2712{ 2713 idetape_tape_t *tape = drive->driver_data; 2714 os_aux_t *aux = stage->aux; 2715 os_partition_t *par = &aux->partition; 2716 os_dat_t *dat = &aux->dat; 2717 2718 if (!tape->onstream || tape->raw) 2719 return; 2720 memset(aux, 0, sizeof(*aux)); 2721 aux->format_id = htonl(0); 2722 memcpy(aux->application_sig, "LIN3", 4); 2723 aux->hdwr = htonl(0); 2724 aux->frame_type = frame_type; 2725 2726 if (frame_type == OS_FRAME_TYPE_HEADER) { 2727 aux->update_frame_cntr = htonl(tape->update_frame_cntr); 2728 par->partition_num = OS_CONFIG_PARTITION; 2729 par->par_desc_ver = OS_PARTITION_VERSION; 2730 par->wrt_pass_cntr = htons(0xffff); 2731 par->first_frame_addr = htonl(0); 2732 par->last_frame_addr = htonl(0xbb7); /* 2999 */ 2733 aux->frame_seq_num = htonl(0); 2734 aux->logical_blk_num_high = htonl(0); 2735 aux->logical_blk_num = htonl(0); 2736 aux->next_mark_addr = htonl(tape->first_mark_addr); 2737 } else { 2738 aux->update_frame_cntr = htonl(0); 2739 par->partition_num = OS_DATA_PARTITION; 2740 par->par_desc_ver = OS_PARTITION_VERSION; 2741 par->wrt_pass_cntr = htons(tape->wrt_pass_cntr); 2742 par->first_frame_addr = htonl(OS_DATA_STARTFRAME1); 2743 par->last_frame_addr = htonl(tape->capacity); 2744 aux->frame_seq_num = htonl(logical_blk_num); 2745 aux->logical_blk_num_high = htonl(0); 2746 aux->logical_blk_num = htonl(logical_blk_num); 2747 dat->dat_sz = 8; 2748 dat->reserved1 = 0; 2749 dat->entry_cnt = 1; 2750 dat->reserved3 = 0; 2751 if (frame_type == OS_FRAME_TYPE_DATA) 2752 dat->dat_list[0].blk_sz = htonl(32 * 1024); 2753 else 2754 dat->dat_list[0].blk_sz = 0; 2755 dat->dat_list[0].blk_cnt = htons(1); 2756 if (frame_type == OS_FRAME_TYPE_MARKER) 2757 dat->dat_list[0].flags = OS_DAT_FLAGS_MARK; 2758 else 2759 dat->dat_list[0].flags = OS_DAT_FLAGS_DATA; 2760 dat->dat_list[0].reserved = 0; 2761 } 2762 aux->filemark_cnt = ntohl(tape->filemark_cnt); /* shouldn't this be htonl ?? */ 2763 aux->phys_fm = ntohl(0xffffffff); /* shouldn't this be htonl ?? */ 2764 aux->last_mark_addr = ntohl(tape->last_mark_addr); /* shouldn't this be htonl ?? */ 2765} 2766 2767/* 2768 * idetape_wait_for_request installs a completion in a pending request 2769 * and sleeps until it is serviced. 2770 * 2771 * The caller should ensure that the request will not be serviced 2772 * before we install the completion (usually by disabling interrupts). 2773 */ 2774static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) 2775{ 2776 DECLARE_COMPLETION(wait); 2777 idetape_tape_t *tape = drive->driver_data; 2778 2779#if IDETAPE_DEBUG_BUGS 2780 if (rq == NULL || !IDETAPE_RQ_CMD (rq->cmd)) { 2781 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); 2782 return; 2783 } 2784#endif /* IDETAPE_DEBUG_BUGS */ 2785 rq->waiting = &wait; 2786 tape->waiting = &wait; 2787 spin_unlock(&tape->spinlock); 2788 wait_for_completion(&wait); 2789 rq->waiting = NULL; 2790 tape->waiting = NULL; 2791 spin_lock_irq(&tape->spinlock); 2792} 2793 2794static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) 2795{ 2796 idetape_tape_t *tape = drive->driver_data; 2797 idetape_read_position_result_t *result; 2798 2799#if IDETAPE_DEBUG_LOG 2800 if (tape->debug_level >= 4) 2801 printk (KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); 2802#endif /* IDETAPE_DEBUG_LOG */ 2803 2804 if (!tape->pc->error) { 2805 result = (idetape_read_position_result_t *) tape->pc->buffer; 2806#if IDETAPE_DEBUG_LOG 2807 if (tape->debug_level >= 2) 2808 printk (KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); 2809 if (tape->debug_level >= 2) 2810 printk (KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); 2811#endif /* IDETAPE_DEBUG_LOG */ 2812 if (result->bpu) { 2813 printk (KERN_INFO "ide-tape: Block location is unknown to the tape\n"); 2814 clear_bit (IDETAPE_ADDRESS_VALID, &tape->flags); 2815 idetape_end_request (0, HWGROUP (drive)); 2816 } else { 2817#if IDETAPE_DEBUG_LOG 2818 if (tape->debug_level >= 2) 2819 printk (KERN_INFO "ide-tape: Block Location - %u\n", ntohl (result->first_block)); 2820#endif /* IDETAPE_DEBUG_LOG */ 2821 tape->partition = result->partition; 2822 tape->first_frame_position = ntohl (result->first_block); 2823 tape->last_frame_position = ntohl (result->last_block); 2824 tape->blocks_in_buffer = result->blocks_in_buffer[2]; 2825 set_bit (IDETAPE_ADDRESS_VALID, &tape->flags); 2826 idetape_end_request (1, HWGROUP (drive)); 2827 } 2828 } else { 2829 idetape_end_request (0, HWGROUP (drive)); 2830 } 2831 return ide_stopped; 2832} 2833 2834/* 2835 * idetape_create_write_filemark_cmd will: 2836 * 2837 * 1. Write a filemark if write_filemark=1. 2838 * 2. Flush the device buffers without writing a filemark 2839 * if write_filemark=0. 2840 * 2841 */ 2842static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) 2843{ 2844 idetape_tape_t *tape = drive->driver_data; 2845 2846 idetape_init_pc (pc); 2847 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; 2848 if (tape->onstream) 2849 pc->c[1] = 1; /* Immed bit */ 2850 pc->c[4] = write_filemark; /* not used for OnStream ?? */ 2851 set_bit (PC_WAIT_FOR_DSC, &pc->flags); 2852 pc->callback = &idetape_pc_callback; 2853} 2854 2855static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) 2856{ 2857 idetape_init_pc(pc); 2858 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; 2859 pc->callback = &idetape_pc_callback; 2860} 2861 2862/* 2863 * idetape_queue_pc_tail is based on the following functions: 2864 * 2865 * ide_do_drive_cmd from ide.c 2866 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c 2867 * 2868 * We add a special packet command request to the tail of the request queue, 2869 * and wait for it to be serviced. 2870 * 2871 * This is not to be called from within the request handling part 2872 * of the driver ! We allocate here data in the stack, and it is valid 2873 * until the request is finished. This is not the case for the bottom 2874 * part of the driver, where we are always leaving the functions to wait 2875 * for an interrupt or a timer event. 2876 * 2877 * From the bottom part of the driver, we should allocate safe memory 2878 * using idetape_next_pc_storage and idetape_next_rq_storage, and add 2879 * the request to the request list without waiting for it to be serviced ! 2880 * In that case, we usually use idetape_queue_pc_head. 2881 */ 2882static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) 2883{ 2884 struct request rq; 2885 2886 ide_init_drive_cmd (&rq); 2887 rq.buffer = (char *) pc; 2888 rq.cmd = IDETAPE_PC_RQ1; 2889 return ide_do_drive_cmd (drive, &rq, ide_wait); 2890} 2891 2892static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) 2893{ 2894 idetape_tape_t *tape = drive->driver_data; 2895 2896 idetape_init_pc (pc); 2897 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; 2898 pc->c[4] = cmd; 2899 if (tape->onstream) { 2900 pc->c[1] = 1; 2901 if (cmd == !IDETAPE_LU_LOAD_MASK) 2902 pc->c[4] = 4; 2903 } 2904 set_bit (PC_WAIT_FOR_DSC, &pc->flags); 2905 pc->callback = &idetape_pc_callback; 2906} 2907 2908static int idetape_wait_ready (ide_drive_t *drive, unsigned long long timeout) 2909{ 2910 idetape_tape_t *tape = drive->driver_data; 2911 idetape_pc_t pc; 2912 2913 /* 2914 * Wait for the tape to become ready 2915 */ 2916 timeout += jiffies; 2917 while (time_before(jiffies, timeout)) { 2918 idetape_create_test_unit_ready_cmd(&pc); 2919 if (!__idetape_queue_pc_tail(drive, &pc)) 2920 return 0; 2921 if (tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) { 2922 idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK); 2923 __idetape_queue_pc_tail(drive, &pc); 2924 idetape_create_test_unit_ready_cmd(&pc); 2925 if (!__idetape_queue_pc_tail(drive, &pc)) 2926 return 0; 2927 } 2928 if (!(tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) 2929 break; 2930 current->state = TASK_INTERRUPTIBLE; 2931 schedule_timeout(HZ / 10); 2932 } 2933 return -EIO; 2934} 2935 2936static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) 2937{ 2938 idetape_tape_t *tape = drive->driver_data; 2939 int rc; 2940 2941 rc = __idetape_queue_pc_tail(drive, pc); 2942 if (rc) 2943 return rc; 2944 if (tape->onstream && test_bit(PC_WAIT_FOR_DSC, &pc->flags)) 2945 rc = idetape_wait_ready(drive, 60 * 10 * HZ); /* AJN-4: Changed from 5 to 10 minutes; 2946 because retension takes approx. 8:20 with Onstream 30GB tape */ 2947 return rc; 2948} 2949 2950static int idetape_flush_tape_buffers (ide_drive_t *drive) 2951{ 2952 idetape_pc_t pc; 2953 int rc; 2954 2955 idetape_create_write_filemark_cmd(drive, &pc, 0); 2956 if ((rc = idetape_queue_pc_tail (drive, &pc))) 2957 return rc; 2958 idetape_wait_ready(drive, 60 * 5 * HZ); 2959 return 0; 2960} 2961 2962static void idetape_create_read_position_cmd (idetape_pc_t *pc) 2963{ 2964 idetape_init_pc (pc); 2965 pc->c[0] = IDETAPE_READ_POSITION_CMD; 2966 pc->request_transfer = 20; 2967 pc->callback = &idetape_read_position_callback; 2968} 2969 2970static int idetape_read_position (ide_drive_t *drive) 2971{ 2972 idetape_tape_t *tape = drive->driver_data; 2973 idetape_pc_t pc; 2974 int position; 2975 2976#if IDETAPE_DEBUG_LOG 2977 if (tape->debug_level >= 4) 2978 printk (KERN_INFO "ide-tape: Reached idetape_read_position\n"); 2979#endif /* IDETAPE_DEBUG_LOG */ 2980 2981#ifdef NO_LONGER_REQUIRED 2982 idetape_flush_tape_buffers(drive); 2983#endif 2984 idetape_create_read_position_cmd(&pc); 2985 if (idetape_queue_pc_tail (drive, &pc)) 2986 return -1; 2987 position = tape->first_frame_position; 2988#ifdef NO_LONGER_REQUIRED 2989 if (tape->onstream) { 2990 if ((position != tape->last_frame_position - tape->blocks_in_buffer) && 2991 (position != tape->last_frame_position + tape->blocks_in_buffer)) { 2992 if (tape->blocks_in_buffer == 0) { 2993 printk("ide-tape: %s: correcting read position %d, %d, %d\n", tape->name, position, tape->last_frame_position, tape->blocks_in_buffer); 2994 position = tape->last_frame_position; 2995 tape->first_frame_position = position; 2996 } 2997 } 2998 } 2999#endif 3000 return position; 3001} 3002 3003static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, byte partition, int skip) 3004{ 3005 idetape_tape_t *tape = drive->driver_data; 3006 3007 idetape_init_pc (pc); 3008 pc->c[0] = IDETAPE_LOCATE_CMD; 3009 if (tape->onstream) 3010 pc->c[1] = 1; /* Immediate bit */ 3011 else 3012 pc->c[1] = 2; 3013 put_unaligned (htonl (block), (unsigned int *) &pc->c[3]); 3014 pc->c[8] = partition; 3015 if (tape->onstream) 3016 /* 3017 * Set SKIP bit. 3018 * In case of write error this will write buffered 3019 * data in the drive to this new position! 3020 */ 3021 pc->c[9] = skip << 7; 3022 set_bit (PC_WAIT_FOR_DSC, &pc->flags); 3023 pc->callback = &idetape_pc_callback; 3024} 3025 3026static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) 3027{ 3028 idetape_tape_t *tape = drive->driver_data; 3029 3030 if (!tape->capabilities.lock) 3031 return 0; 3032 3033 idetape_init_pc(pc); 3034 pc->c[0] = IDETAPE_PREVENT_CMD; 3035 pc->c[4] = prevent; 3036 pc->callback = &idetape_pc_callback; 3037 return 1; 3038} 3039 3040static int __idetape_discard_read_pipeline (ide_drive_t *drive) 3041{ 3042 idetape_tape_t *tape = drive->driver_data; 3043 unsigned long flags; 3044 int cnt; 3045 3046 if (tape->chrdev_direction != idetape_direction_read) 3047 return 0; 3048 tape->merge_stage_size = 0; 3049 if (tape->merge_stage != NULL) { 3050 __idetape_kfree_stage (tape->merge_stage); 3051 tape->merge_stage = NULL; 3052 } 3053 tape->chrdev_direction = idetape_direction_none; 3054 3055 if (tape->first_stage == NULL) 3056 return 0; 3057 3058 spin_lock_irqsave(&tape->spinlock, flags); 3059 tape->next_stage = NULL; 3060 if (idetape_pipeline_active (tape)) 3061 idetape_wait_for_request(drive, tape->active_data_request); 3062 spin_unlock_irqrestore(&tape->spinlock, flags); 3063 3064 cnt = tape->nr_stages - tape->nr_pending_stages; 3065 while (tape->first_stage != NULL) 3066 idetape_remove_stage_head (drive); 3067 tape->nr_pending_stages = 0; 3068 tape->max_stages = tape->min_pipeline; 3069 return cnt; 3070} 3071 3072/* 3073 * idetape_position_tape positions the tape to the requested block 3074 * using the LOCATE packet command. A READ POSITION command is then 3075 * issued to check where we are positioned. 3076 * 3077 * Like all higher level operations, we queue the commands at the tail 3078 * of the request queue and wait for their completion. 3079 * 3080 */ 3081static int idetape_position_tape (ide_drive_t *drive, unsigned int block, byte partition, int skip) 3082{ 3083 idetape_tape_t *tape = drive->driver_data; 3084 int retval; 3085 idetape_pc_t pc; 3086 3087 if (tape->chrdev_direction == idetape_direction_read) 3088 __idetape_discard_read_pipeline(drive); 3089 idetape_wait_ready(drive, 60 * 5 * HZ); 3090 idetape_create_locate_cmd (drive, &pc, block, partition, skip); 3091 retval = idetape_queue_pc_tail (drive, &pc); 3092 if (retval) 3093 return (retval); 3094 3095 idetape_create_read_position_cmd (&pc); 3096 return (idetape_queue_pc_tail (drive, &pc)); 3097} 3098 3099static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) 3100{ 3101 idetape_tape_t *tape = drive->driver_data; 3102 int cnt; 3103 int seek, position; 3104 3105 cnt = __idetape_discard_read_pipeline(drive); 3106 if (restore_position) { 3107 position = idetape_read_position(drive); 3108#if ONSTREAM_DEBUG 3109 if (tape->debug_level >= 2) 3110 printk(KERN_INFO "ide-tape: address %u, nr_stages %d\n", position, cnt); 3111#endif 3112 seek = position > cnt ? position - cnt : 0; 3113 if (idetape_position_tape(drive, seek, 0, 0)) { 3114 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); 3115 return; 3116 } 3117 } 3118} 3119 3120static void idetape_update_stats (ide_drive_t *drive) 3121{ 3122 idetape_pc_t pc; 3123 3124 idetape_create_mode_sense_cmd (&pc, IDETAPE_BUFFER_FILLING_PAGE); 3125 pc.callback = idetape_onstream_buffer_fill_callback; 3126 (void) idetape_queue_pc_tail(drive, &pc); 3127} 3128 3129/* 3130 * idetape_queue_rw_tail generates a read/write request for the block 3131 * device interface and wait for it to be serviced. 3132 */ 3133static int idetape_queue_rw_tail (ide_drive_t *drive, int cmd, int blocks, struct buffer_head *bh) 3134{ 3135 idetape_tape_t *tape = drive->driver_data; 3136 struct request rq; 3137 3138#if IDETAPE_DEBUG_LOG 3139 if (tape->debug_level >= 2) 3140 printk (KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); 3141#endif /* IDETAPE_DEBUG_LOG */ 3142#if IDETAPE_DEBUG_BUGS 3143 if (idetape_pipeline_active (tape)) { 3144 printk (KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); 3145 return (0); 3146 } 3147#endif /* IDETAPE_DEBUG_BUGS */ 3148 3149 ide_init_drive_cmd (&rq); 3150 rq.bh = bh; 3151 rq.cmd = cmd; 3152 rq.sector = tape->first_frame_position; 3153 rq.nr_sectors = rq.current_nr_sectors = blocks; 3154 if (tape->onstream) 3155 tape->postpone_cnt = 600; 3156 (void) ide_do_drive_cmd (drive, &rq, ide_wait); 3157 3158 if (cmd != IDETAPE_READ_RQ && cmd != IDETAPE_WRITE_RQ) 3159 return 0; 3160 3161 if (tape->merge_stage) 3162 idetape_init_merge_stage (tape); 3163 if (rq.errors == IDETAPE_ERROR_GENERAL) 3164 return -EIO; 3165 return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); 3166} 3167 3168/* 3169 * Read back the drive's internal buffer contents, as a part 3170 * of the write error recovery mechanism for old OnStream 3171 * firmware revisions. 3172 */ 3173static void idetape_onstream_read_back_buffer (ide_drive_t *drive) 3174{ 3175 idetape_tape_t *tape = drive->driver_data; 3176 int frames, i, logical_blk_num; 3177 idetape_stage_t *stage, *first = NULL, *last = NULL; 3178 os_aux_t *aux; 3179 struct request *rq; 3180 unsigned char *p; 3181 unsigned long flags; 3182 3183 idetape_update_stats(drive); 3184 frames = tape->cur_frames; 3185 logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num) - frames; 3186 printk(KERN_INFO "ide-tape: %s: reading back %d frames from the drive's internal buffer\n", tape->name, frames); 3187 for (i = 0; i < frames; i++) { 3188 stage = __idetape_kmalloc_stage(tape, 0, 0); 3189 if (!first) 3190 first = stage; 3191 aux = stage->aux; 3192 p = stage->bh->b_data; 3193 idetape_queue_rw_tail(drive, IDETAPE_READ_BUFFER_RQ, tape->capabilities.ctl, stage->bh); 3194#if ONSTREAM_DEBUG 3195 if (tape->debug_level >= 2) 3196 printk(KERN_INFO "ide-tape: %s: read back logical block %d, data %x %x %x %x\n", tape->name, logical_blk_num, *p++, *p++, *p++, *p++); 3197#endif 3198 rq = &stage->rq; 3199 ide_init_drive_cmd (rq); 3200 rq->cmd = IDETAPE_WRITE_RQ; 3201 rq->sector = tape->first_frame_position; 3202 rq->nr_sectors = rq->current_nr_sectors = tape->capabilities.ctl; 3203 idetape_init_stage(drive, stage, OS_FRAME_TYPE_DATA, logical_blk_num++); 3204 stage->next = NULL; 3205 if (last) 3206 last->next = stage; 3207 last = stage; 3208 } 3209 if (frames) { 3210 spin_lock_irqsave(&tape->spinlock, flags); 3211 last->next = tape->first_stage; 3212 tape->next_stage = tape->first_stage = first; 3213 tape->nr_stages += frames; 3214 tape->nr_pending_stages += frames; 3215 spin_unlock_irqrestore(&tape->spinlock, flags); 3216 } 3217 idetape_update_stats(drive); 3218#if ONSTREAM_DEBUG 3219 if (tape->debug_level >= 2) 3220 printk(KERN_INFO "ide-tape: %s: frames left in buffer: %d\n", tape->name, tape->cur_frames); 3221#endif 3222} 3223 3224/* 3225 * Error recovery algorithm for the OnStream tape. 3226 */ 3227static void idetape_onstream_write_error_recovery (ide_drive_t *drive) 3228{ 3229 idetape_tape_t *tape = drive->driver_data; 3230 unsigned int block; 3231 3232 if (tape->onstream_write_error == OS_WRITE_ERROR) { 3233 printk(KERN_ERR "ide-tape: %s: onstream_write_error_recovery: detected physical bad block at %u, logical %u first frame %u last_frame %u bufblocks %u stages %u skipping %u frames\n", 3234 tape->name, ntohl(tape->sense.information), tape->logical_blk_num, 3235 tape->first_frame_position, tape->last_frame_position, 3236 tape->blocks_in_buffer, tape->nr_stages, 3237 (ntohl(tape->sense.command_specific) >> 16) & 0xff ); 3238 block = ntohl(tape->sense.information) + ((ntohl(tape->sense.command_specific) >> 16) & 0xff); 3239 idetape_update_stats(drive); 3240 printk(KERN_ERR "ide-tape: %s: relocating %d buffered logical blocks to physical block %u\n", tape->name, tape->cur_frames, block); 3241 if (tape->firmware_revision_num >= 106) 3242 idetape_position_tape(drive, block, 0, 1); 3243 else { 3244 idetape_onstream_read_back_buffer(drive); 3245 idetape_position_tape(drive, block, 0, 0); 3246 } 3247#if ONSTREAM_DEBUG 3248 if (tape->debug_level >= 1) 3249 printk(KERN_ERR "ide-tape: %s: positioning complete, cur_frames %d, pos %d, tape pos %d\n", tape->name, tape->cur_frames, tape->first_frame_position, tape->last_frame_position); 3250#endif 3251 } else if (tape->onstream_write_error == OS_PART_ERROR) { 3252#if ONSTREAM_DEBUG 3253 if (tape->debug_level >= 1) 3254 printk(KERN_INFO "ide-tape: %s: skipping over config partition\n", tape->name); 3255#endif 3256 idetape_flush_tape_buffers(drive); 3257 block = idetape_read_position(drive); 3258 if (block != OS_DATA_ENDFRAME1) 3259 printk(KERN_ERR "ide-tape: warning, current position %d, expected %d\n", block, OS_DATA_ENDFRAME1); 3260 idetape_position_tape(drive, 0xbb8, 0, 0); /* 3000 */ 3261 } 3262 tape->onstream_write_error = 0; 3263} 3264 3265/* 3266 * idetape_insert_pipeline_into_queue is used to start servicing the 3267 * pipeline stages, starting from tape->next_stage. 3268 */ 3269static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) 3270{ 3271 idetape_tape_t *tape = drive->driver_data; 3272 3273 if (tape->next_stage == NULL) 3274 return; 3275 if (!idetape_pipeline_active (tape)) { 3276 if (tape->onstream_write_error) 3277 idetape_onstream_write_error_recovery(drive); 3278 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 3279 idetape_active_next_stage (drive); 3280 (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end); 3281 } 3282} 3283 3284static void idetape_create_inquiry_cmd (idetape_pc_t *pc) 3285{ 3286 idetape_init_pc(pc); 3287 pc->c[0] = IDETAPE_INQUIRY_CMD; 3288 pc->c[4] = pc->request_transfer = 254; 3289 pc->callback = &idetape_pc_callback; 3290} 3291 3292static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) 3293{ 3294 idetape_tape_t *tape = drive->driver_data; 3295 3296 idetape_init_pc (pc); 3297 pc->c[0] = IDETAPE_REWIND_CMD; 3298 if (tape->onstream) 3299 pc->c[1] = 1; 3300 set_bit (PC_WAIT_FOR_DSC, &pc->flags); 3301 pc->callback = &idetape_pc_callback; 3302} 3303 3304static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) 3305{ 3306 idetape_init_pc (pc); 3307 set_bit (PC_WRITING, &pc->flags); 3308 pc->c[0] = IDETAPE_MODE_SELECT_CMD; 3309 pc->c[1] = 0x10; 3310 put_unaligned (htons(length), (unsigned short *) &pc->c[3]); 3311 pc->request_transfer = 255; 3312 pc->callback = &idetape_pc_callback; 3313} 3314 3315static void idetape_create_erase_cmd (idetape_pc_t *pc) 3316{ 3317 idetape_init_pc (pc); 3318 pc->c[0] = IDETAPE_ERASE_CMD; 3319 pc->c[1] = 1; 3320 set_bit (PC_WAIT_FOR_DSC, &pc->flags); 3321 pc->callback = &idetape_pc_callback; 3322} 3323 3324static void idetape_create_space_cmd (idetape_pc_t *pc,int count,byte cmd) 3325{ 3326 idetape_init_pc (pc); 3327 pc->c[0] = IDETAPE_SPACE_CMD; 3328 put_unaligned (htonl (count), (unsigned int *) &pc->c[1]); 3329 pc->c[1] = cmd; 3330 set_bit (PC_WAIT_FOR_DSC, &pc->flags); 3331 pc->callback = &idetape_pc_callback; 3332} 3333 3334/* 3335 * Verify that we have the correct tape frame 3336 */ 3337static int idetape_verify_stage (ide_drive_t *drive, idetape_stage_t *stage, int logical_blk_num, int quiet) 3338{ 3339 idetape_tape_t *tape = drive->driver_data; 3340 os_aux_t *aux = stage->aux; 3341 os_partition_t *par = &aux->partition; 3342 struct request *rq = &stage->rq; 3343 struct buffer_head *bh; 3344 3345 if (!tape->onstream) 3346 return 1; 3347 if (tape->raw) { 3348 if (rq->errors) { 3349 bh = stage->bh; 3350 while (bh) { 3351 memset(bh->b_data, 0, bh->b_size); 3352 bh = bh->b_reqnext; 3353 } 3354 strcpy(stage->bh->b_data, "READ ERROR ON FRAME"); 3355 } 3356 return 1; 3357 } 3358 if (rq->errors == IDETAPE_ERROR_GENERAL) { 3359 printk(KERN_INFO "ide-tape: %s: skipping frame %d, read error\n", tape->name, tape->first_frame_position); 3360 return 0; 3361 } 3362 if (rq->errors == IDETAPE_ERROR_EOD) { 3363 printk(KERN_INFO "ide-tape: %s: skipping frame %d, eod\n", tape->name, tape->first_frame_position); 3364 return 0; 3365 } 3366 if (ntohl(aux->format_id) != 0) { 3367 printk(KERN_INFO "ide-tape: %s: skipping frame %d, format_id %u\n", tape->name, tape->first_frame_position, ntohl(aux->format_id)); 3368 return 0; 3369 } 3370 if (memcmp(aux->application_sig, tape->application_sig, 4) != 0) { 3371 printk(KERN_INFO "ide-tape: %s: skipping frame %d, incorrect application signature\n", tape->name, tape->first_frame_position); 3372 return 0; 3373 } 3374 if (aux->frame_type != OS_FRAME_TYPE_DATA && 3375 aux->frame_type != OS_FRAME_TYPE_EOD && 3376 aux->frame_type != OS_FRAME_TYPE_MARKER) { 3377 printk(KERN_INFO "ide-tape: %s: skipping frame %d, frame type %x\n", tape->name, tape->first_frame_position, aux->frame_type); 3378 return 0; 3379 } 3380 if (par->partition_num != OS_DATA_PARTITION) { 3381 if (!tape->linux_media || tape->linux_media_version != 2) { 3382 printk(KERN_INFO "ide-tape: %s: skipping frame %d, partition num %d\n", tape->name, tape->first_frame_position, par->partition_num); 3383 return 0; 3384 } 3385 } 3386 if (par->par_desc_ver != OS_PARTITION_VERSION) { 3387 printk(KERN_INFO "ide-tape: %s: skipping frame %d, partition version %d\n", tape->name, tape->first_frame_position, par->par_desc_ver); 3388 return 0; 3389 } 3390 if (ntohs(par->wrt_pass_cntr) != tape->wrt_pass_cntr) { 3391 printk(KERN_INFO "ide-tape: %s: skipping frame %d, wrt_pass_cntr %d (expected %d)(logical_blk_num %u)\n", tape->name, tape->first_frame_position, ntohs(par->wrt_pass_cntr), tape->wrt_pass_cntr, ntohl(aux->logical_blk_num)); 3392 return 0; 3393 } 3394 if (aux->frame_seq_num != aux->logical_blk_num) { 3395 printk(KERN_INFO "ide-tape: %s: skipping frame %d, seq != logical\n", tape->name, tape->first_frame_position); 3396 return 0; 3397 } 3398 if (logical_blk_num != -1 && ntohl(aux->logical_blk_num) != logical_blk_num) { 3399 if (!quiet) 3400 printk(KERN_INFO "ide-tape: %s: skipping frame %d, logical_blk_num %u (expected %d)\n", tape->name, tape->first_frame_position, ntohl(aux->logical_blk_num), logical_blk_num); 3401 return 0; 3402 } 3403 if (aux->frame_type == OS_FRAME_TYPE_MARKER) { 3404 rq->errors = IDETAPE_ERROR_FILEMARK; 3405 rq->current_nr_sectors = rq->nr_sectors; 3406 } 3407 return 1; 3408} 3409 3410static void idetape_wait_first_stage (ide_drive_t *drive) 3411{ 3412 idetape_tape_t *tape = drive->driver_data; 3413 unsigned long flags; 3414 3415 if (tape->first_stage == NULL) 3416 return; 3417 spin_lock_irqsave(&tape->spinlock, flags); 3418 if (tape->active_stage == tape->first_stage) 3419 idetape_wait_for_request(drive, tape->active_data_request); 3420 spin_unlock_irqrestore(&tape->spinlock, flags); 3421} 3422 3423/* 3424 * idetape_add_chrdev_write_request tries to add a character device 3425 * originated write request to our pipeline. In case we don't succeed, 3426 * we revert to non-pipelined operation mode for this request. 3427 * 3428 * 1. Try to allocate a new pipeline stage. 3429 * 2. If we can't, wait for more and more requests to be serviced 3430 * and try again each time. 3431 * 3. If we still can't allocate a stage, fallback to 3432 * non-pipelined operation mode for this request. 3433 */ 3434static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) 3435{ 3436 idetape_tape_t *tape = drive->driver_data; 3437 idetape_stage_t *new_stage; 3438 unsigned long flags; 3439 struct request *rq; 3440 3441#if IDETAPE_DEBUG_LOG 3442 if (tape->debug_level >= 3) 3443 printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); 3444#endif /* IDETAPE_DEBUG_LOG */ 3445 3446 /* 3447 * Attempt to allocate a new stage. 3448 * Pay special attention to possible race conditions. 3449 */ 3450 while ((new_stage = idetape_kmalloc_stage (tape)) == NULL) { 3451 spin_lock_irqsave(&tape->spinlock, flags); 3452 if (idetape_pipeline_active (tape)) { 3453 idetape_wait_for_request(drive, tape->active_data_request); 3454 spin_unlock_irqrestore(&tape->spinlock, flags); 3455 } else { 3456 spin_unlock_irqrestore(&tape->spinlock, flags); 3457 idetape_insert_pipeline_into_queue (drive); 3458 if (idetape_pipeline_active (tape)) 3459 continue; 3460 /* 3461 * Linux is short on memory. Fallback to 3462 * non-pipelined operation mode for this request. 3463 */ 3464 return idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh); 3465 } 3466 } 3467 rq = &new_stage->rq; 3468 ide_init_drive_cmd (rq); 3469 rq->cmd = IDETAPE_WRITE_RQ; 3470 rq->sector = tape->first_frame_position; /* Doesn't actually matter - We always assume sequential access */ 3471 rq->nr_sectors = rq->current_nr_sectors = blocks; 3472 3473 idetape_switch_buffers (tape, new_stage); 3474 idetape_init_stage(drive, new_stage, OS_FRAME_TYPE_DATA, tape->logical_blk_num); 3475 tape->logical_blk_num++; 3476 idetape_add_stage_tail (drive, new_stage); 3477 tape->pipeline_head++; 3478#if USE_IOTRACE 3479 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); 3480#endif 3481 calculate_speeds(drive); 3482 3483 /* 3484 * Estimate whether the tape has stopped writing by checking 3485 * if our write pipeline is currently empty. If we are not 3486 * writing anymore, wait for the pipeline to be full enough 3487 * (90%) before starting to service requests, so that we will 3488 * be able to keep up with the higher speeds of the tape. 3489 * 3490 * For the OnStream drive, we can query the number of pending 3491 * frames in the drive's internal buffer. As long as the tape 3492 * is still writing, it is better to write frames immediately 3493 * rather than gather them in the pipeline. This will give the 3494 * tape's firmware the ability to sense the current incoming 3495 * data rate more accurately, and since the OnStream tape 3496 * supports variable speeds, it can try to adjust itself to the 3497 * incoming data rate. 3498 */ 3499 if (!idetape_pipeline_active(tape)) { 3500 if (tape->nr_stages >= tape->max_stages * 9 / 10 || 3501 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { 3502 tape->measure_insert_time = 1; 3503 tape->insert_time = jiffies; 3504 tape->insert_size = 0; 3505 tape->insert_speed = 0; 3506 idetape_insert_pipeline_into_queue (drive); 3507 } else if (tape->onstream) { 3508 idetape_update_stats(drive); 3509 if (tape->cur_frames > 5) 3510 idetape_insert_pipeline_into_queue (drive); 3511 } 3512 } 3513 if (test_and_clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags)) /* Return a deferred error */ 3514 return -EIO; 3515 return blocks; 3516} 3517 3518/* 3519 * idetape_wait_for_pipeline will wait until all pending pipeline 3520 * requests are serviced. Typically called on device close. 3521 */ 3522static void idetape_wait_for_pipeline (ide_drive_t *drive) 3523{ 3524 idetape_tape_t *tape = drive->driver_data; 3525 unsigned long flags; 3526 3527 while (tape->next_stage || idetape_pipeline_active(tape)) { 3528 idetape_insert_pipeline_into_queue (drive); 3529 spin_lock_irqsave(&tape->spinlock, flags); 3530 if (idetape_pipeline_active(tape)) 3531 idetape_wait_for_request(drive, tape->active_data_request); 3532 spin_unlock_irqrestore(&tape->spinlock, flags); 3533 } 3534} 3535 3536static void idetape_empty_write_pipeline (ide_drive_t *drive) 3537{ 3538 idetape_tape_t *tape = drive->driver_data; 3539 int blocks, i, min; 3540 struct buffer_head *bh; 3541 3542#if IDETAPE_DEBUG_BUGS 3543 if (tape->chrdev_direction != idetape_direction_write) { 3544 printk (KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); 3545 return; 3546 } 3547 if (tape->merge_stage_size > tape->stage_size) { 3548 printk (KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 3549 tape->merge_stage_size = tape->stage_size; 3550 } 3551#endif /* IDETAPE_DEBUG_BUGS */ 3552 if (tape->merge_stage_size) { 3553 blocks = tape->merge_stage_size / tape->tape_block_size; 3554 if (tape->merge_stage_size % tape->tape_block_size) { 3555 blocks++; 3556 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; 3557 bh = tape->bh->b_reqnext; 3558 while (bh) { 3559 atomic_set(&bh->b_count, 0); 3560 bh = bh->b_reqnext; 3561 } 3562 bh = tape->bh; 3563 while (i) { 3564 if (bh == NULL) { 3565 printk(KERN_INFO "ide-tape: bug, bh NULL\n"); 3566 break; 3567 } 3568 min = IDE_MIN(i, bh->b_size - atomic_read(&bh->b_count)); 3569 memset(bh->b_data + atomic_read(&bh->b_count), 0, min); 3570 atomic_add(min, &bh->b_count); 3571 i -= min; 3572 bh = bh->b_reqnext; 3573 } 3574 } 3575 (void) idetape_add_chrdev_write_request (drive, blocks); 3576 tape->merge_stage_size = 0; 3577 } 3578 idetape_wait_for_pipeline (drive); 3579 if (tape->merge_stage != NULL) { 3580 __idetape_kfree_stage (tape->merge_stage); 3581 tape->merge_stage = NULL; 3582 } 3583 clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); 3584 tape->chrdev_direction = idetape_direction_none; 3585 3586 /* 3587 * On the next backup, perform the feedback loop again. 3588 * (I don't want to keep sense information between backups, 3589 * as some systems are constantly on, and the system load 3590 * can be totally different on the next backup). 3591 */ 3592 tape->max_stages = tape->min_pipeline; 3593#if IDETAPE_DEBUG_BUGS 3594 if (tape->first_stage != NULL || tape->next_stage != NULL || tape->last_stage != NULL || tape->nr_stages != 0) { 3595 printk (KERN_ERR "ide-tape: ide-tape pipeline bug, " 3596 "first_stage %p, next_stage %p, last_stage %p, nr_stages %d\n", 3597 tape->first_stage, tape->next_stage, tape->last_stage, tape->nr_stages); 3598 } 3599#endif /* IDETAPE_DEBUG_BUGS */ 3600} 3601 3602static void idetape_restart_speed_control (ide_drive_t *drive) 3603{ 3604 idetape_tape_t *tape = drive->driver_data; 3605 3606 tape->restart_speed_control_req = 0; 3607 tape->pipeline_head = 0; 3608 tape->buffer_head = tape->tape_head = tape->cur_frames; 3609 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; 3610 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; 3611 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; 3612 tape->uncontrolled_pipeline_head_speed = 0; 3613 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; 3614 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; 3615} 3616 3617static int idetape_initiate_read (ide_drive_t *drive, int max_stages) 3618{ 3619 idetape_tape_t *tape = drive->driver_data; 3620 idetape_stage_t *new_stage; 3621 struct request rq; 3622 int bytes_read; 3623 int blocks = tape->capabilities.ctl; 3624 3625 if (tape->chrdev_direction != idetape_direction_read) { /* Initialize read operation */ 3626 if (tape->chrdev_direction == idetape_direction_write) { 3627 idetape_empty_write_pipeline (drive); 3628 idetape_flush_tape_buffers (drive); 3629 } 3630#if IDETAPE_DEBUG_BUGS 3631 if (tape->merge_stage || tape->merge_stage_size) { 3632 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); 3633 tape->merge_stage_size = 0; 3634 } 3635#endif /* IDETAPE_DEBUG_BUGS */ 3636 if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL) 3637 return -ENOMEM; 3638 tape->chrdev_direction = idetape_direction_read; 3639 tape->logical_blk_num = 0; 3640 3641 /* 3642 * Issue a read 0 command to ensure that DSC handshake 3643 * is switched from completion mode to buffer available 3644 * mode. 3645 */ 3646 bytes_read = idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 0, tape->merge_stage->bh); 3647 if (bytes_read < 0) { 3648 kfree (tape->merge_stage); 3649 tape->merge_stage = NULL; 3650 tape->chrdev_direction = idetape_direction_none; 3651 return bytes_read; 3652 } 3653 } 3654 if (tape->restart_speed_control_req) 3655 idetape_restart_speed_control(drive); 3656 ide_init_drive_cmd (&rq); 3657 rq.cmd = IDETAPE_READ_RQ; 3658 rq.sector = tape->first_frame_position; 3659 rq.nr_sectors = rq.current_nr_sectors = blocks; 3660 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && tape->nr_stages <= max_stages) { 3661 new_stage = idetape_kmalloc_stage (tape); 3662 while (new_stage != NULL) { 3663 new_stage->rq = rq; 3664 idetape_add_stage_tail (drive, new_stage); 3665 if (tape->nr_stages >= max_stages) 3666 break; 3667 new_stage = idetape_kmalloc_stage (tape); 3668 } 3669 } 3670 if (!idetape_pipeline_active(tape)) { 3671 if (tape->nr_pending_stages >= 3 * max_stages / 4) { 3672 tape->measure_insert_time = 1; 3673 tape->insert_time = jiffies; 3674 tape->insert_size = 0; 3675 tape->insert_speed = 0; 3676 idetape_insert_pipeline_into_queue (drive); 3677 } else if (tape->onstream) { 3678 idetape_update_stats(drive); 3679 if (tape->cur_frames < tape->max_frames - 5) 3680 idetape_insert_pipeline_into_queue (drive); 3681 } 3682 } 3683 return 0; 3684} 3685 3686static int idetape_get_logical_blk (ide_drive_t *drive, int logical_blk_num, int max_stages, int quiet) 3687{ 3688 idetape_tape_t *tape = drive->driver_data; 3689 unsigned long flags; 3690 int cnt = 0, x, position; 3691 3692 /* 3693 * Search and wait for the next logical tape block 3694 */ 3695 while (1) { 3696 if (cnt++ > 1000) { /* AJN: was 100 */ 3697 printk(KERN_INFO "ide-tape: %s: couldn't find logical block %d, aborting\n", tape->name, logical_blk_num); 3698 return 0; 3699 } 3700 idetape_initiate_read(drive, max_stages); 3701 if (tape->first_stage == NULL) { 3702 if (tape->onstream) { 3703#if ONSTREAM_DEBUG 3704 if (tape->debug_level >= 1) 3705 printk(KERN_INFO "ide-tape: %s: first_stage == NULL, pipeline error %ld\n", tape->name, (long)test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)); 3706#endif 3707 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 3708 position = idetape_read_position(drive); 3709 printk(KERN_INFO "ide-tape: %s: blank block detected at %d\n", tape->name, position); 3710 if (position >= 3000 && position < 3080) 3711 position += 32; /* Why is this check and number ??? MM */ 3712 if (position >= OS_DATA_ENDFRAME1 && position < 3000) 3713 position = 3000; 3714 else 3715 /* 3716 * compensate for write errors that generally skip 80 frames, 3717 * expect around 20 read errors in a row... 3718 */ 3719 position += 60; 3720 if (position >= OS_DATA_ENDFRAME1 && position < 3000) 3721 position = 3000; 3722 printk(KERN_INFO "ide-tape: %s: positioning tape to block %d\n", tape->name, position); 3723 if (position == 3000) /* seems to be needed to correctly position at block 3000 MM */ 3724 idetape_position_tape(drive, 0, 0, 0); 3725 idetape_position_tape(drive, position, 0, 0); 3726 cnt += 40; 3727 continue; 3728 } else 3729 return 0; 3730 } 3731 idetape_wait_first_stage(drive); 3732 if (idetape_verify_stage(drive, tape->first_stage, logical_blk_num, quiet)) 3733 break; 3734 if (tape->first_stage->rq.errors == IDETAPE_ERROR_EOD) 3735 cnt--; 3736 if (idetape_verify_stage(drive, tape->first_stage, -1, quiet)) { 3737 x = ntohl(tape->first_stage->aux->logical_blk_num); 3738 if (x > logical_blk_num) { 3739 printk(KERN_ERR "ide-tape: %s: couldn't find logical block %d, aborting (block %d found)\n", tape->name, logical_blk_num, x); 3740 return 0; 3741 } 3742 } 3743 spin_lock_irqsave(&tape->spinlock, flags); 3744 idetape_remove_stage_head(drive); 3745 spin_unlock_irqrestore(&tape->spinlock, flags); 3746 } 3747 if (tape->onstream) 3748 tape->logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num); 3749 return 1; 3750} 3751 3752/* 3753 * idetape_add_chrdev_read_request is called from idetape_chrdev_read 3754 * to service a character device read request and add read-ahead 3755 * requests to our pipeline. 3756 */ 3757static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) 3758{ 3759 idetape_tape_t *tape = drive->driver_data; 3760 unsigned long flags; 3761 struct request *rq_ptr; 3762 int bytes_read; 3763 3764#if IDETAPE_DEBUG_LOG 3765 if (tape->debug_level >= 4) 3766 printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); 3767#endif /* IDETAPE_DEBUG_LOG */ 3768 3769 /* 3770 * Wait for the next logical block to be available at the head 3771 * of the pipeline 3772 */ 3773 if (!idetape_get_logical_blk(drive, tape->logical_blk_num, tape->max_stages, 0)) { 3774 if (tape->onstream) { 3775 set_bit(IDETAPE_READ_ERROR, &tape->flags); 3776 return 0; 3777 } 3778 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 3779 return 0; 3780 return idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, blocks, tape->merge_stage->bh); 3781 } 3782 rq_ptr = &tape->first_stage->rq; 3783 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); 3784 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; 3785 3786 3787 if (tape->onstream && !tape->raw && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { 3788#if ONSTREAM_DEBUG 3789 if (tape->debug_level >= 2) 3790 printk(KERN_INFO "ide-tape: %s: EOD reached\n", tape->name); 3791#endif 3792 return 0; 3793 } 3794 if (rq_ptr->errors == IDETAPE_ERROR_EOD) 3795 return 0; 3796 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) { 3797 idetape_switch_buffers (tape, tape->first_stage); 3798 set_bit (IDETAPE_FILEMARK, &tape->flags); 3799#if USE_IOTRACE 3800 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); 3801#endif 3802 calculate_speeds(drive); 3803 } else { 3804 idetape_switch_buffers (tape, tape->first_stage); 3805 if (rq_ptr->errors == IDETAPE_ERROR_GENERAL) { 3806#if ONSTREAM_DEBUG 3807 if (tape->debug_level >= 1) 3808 printk(KERN_INFO "ide-tape: error detected, bytes_read %d\n", bytes_read); 3809#endif 3810 } 3811 clear_bit (IDETAPE_FILEMARK, &tape->flags); 3812 spin_lock_irqsave(&tape->spinlock, flags); 3813 idetape_remove_stage_head (drive); 3814 spin_unlock_irqrestore(&tape->spinlock, flags); 3815 tape->logical_blk_num++; 3816 tape->pipeline_head++; 3817#if USE_IOTRACE 3818 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); 3819#endif 3820 calculate_speeds(drive); 3821 } 3822#if IDETAPE_DEBUG_BUGS 3823 if (bytes_read > blocks*tape->tape_block_size) { 3824 printk (KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); 3825 bytes_read=blocks*tape->tape_block_size; 3826 } 3827#endif /* IDETAPE_DEBUG_BUGS */ 3828 return (bytes_read); 3829} 3830 3831static void idetape_pad_zeros (ide_drive_t *drive, int bcount) 3832{ 3833 idetape_tape_t *tape = drive->driver_data; 3834 struct buffer_head *bh; 3835 int count, blocks; 3836 3837 while (bcount) { 3838 bh = tape->merge_stage->bh; 3839 count = IDE_MIN (tape->stage_size, bcount); 3840 bcount -= count; 3841 blocks = count / tape->tape_block_size; 3842 while (count) { 3843 atomic_set(&bh->b_count, IDE_MIN (count, bh->b_size)); 3844 memset (bh->b_data, 0, atomic_read(&bh->b_count)); 3845 count -= atomic_read(&bh->b_count); 3846 bh = bh->b_reqnext; 3847 } 3848 idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bh); 3849 } 3850} 3851 3852static int idetape_pipeline_size (ide_drive_t *drive) 3853{ 3854 idetape_tape_t *tape = drive->driver_data; 3855 idetape_stage_t *stage; 3856 struct request *rq; 3857 int size = 0; 3858 3859 idetape_wait_for_pipeline (drive); 3860 stage = tape->first_stage; 3861 while (stage != NULL) { 3862 rq = &stage->rq; 3863 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); 3864 if (rq->errors == IDETAPE_ERROR_FILEMARK) 3865 size += tape->tape_block_size; 3866 stage = stage->next; 3867 } 3868 size += tape->merge_stage_size; 3869 return size; 3870} 3871 3872/* 3873 * Rewinds the tape to the Beginning Of the current Partition (BOP). 3874 * 3875 * We currently support only one partition. 3876 */ 3877static int idetape_rewind_tape (ide_drive_t *drive) 3878{ 3879 int retval; 3880 idetape_pc_t pc; 3881 idetape_tape_t *tape = drive->driver_data; 3882#if IDETAPE_DEBUG_LOG 3883 if (tape->debug_level >= 2) 3884 printk (KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); 3885#endif /* IDETAPE_DEBUG_LOG */ 3886 3887 idetape_create_rewind_cmd (drive, &pc); 3888 retval = idetape_queue_pc_tail (drive, &pc); 3889 if (retval) 3890 return retval; 3891 3892 idetape_create_read_position_cmd (&pc); 3893 retval = idetape_queue_pc_tail (drive, &pc); 3894 if (retval) 3895 return retval; 3896 tape->logical_blk_num = 0; 3897 return 0; 3898} 3899 3900/* 3901 * Our special ide-tape ioctl's. 3902 * 3903 * Currently there aren't any ioctl's. 3904 * mtio.h compatible commands should be issued to the character device 3905 * interface. 3906 */ 3907static int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, 3908 unsigned int cmd, unsigned long arg) 3909{ 3910 idetape_tape_t *tape = drive->driver_data; 3911 idetape_config_t config; 3912 3913#if IDETAPE_DEBUG_LOG 3914 if (tape->debug_level >= 4) 3915 printk (KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); 3916#endif /* IDETAPE_DEBUG_LOG */ 3917 switch (cmd) { 3918 case 0x0340: 3919 if (copy_from_user ((char *) &config, (char *) arg, sizeof (idetape_config_t))) 3920 return -EFAULT; 3921 tape->best_dsc_rw_frequency = config.dsc_rw_frequency; 3922 tape->max_stages = config.nr_stages; 3923 break; 3924 case 0x0350: 3925 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; 3926 config.nr_stages = tape->max_stages; 3927 if (copy_to_user ((char *) arg, (char *) &config, sizeof (idetape_config_t))) 3928 return -EFAULT; 3929 break; 3930 default: 3931 return -EIO; 3932 } 3933 return 0; 3934} 3935 3936/* 3937 * The block device interface should not be used for data transfers. 3938 * However, we still allow opening it so that we can issue general 3939 * ide driver configuration ioctl's, such as the interrupt unmask feature. 3940 */ 3941static int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive) 3942{ 3943 MOD_INC_USE_COUNT; 3944#if ONSTREAM_DEBUG 3945 printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_blkdev_open\n"); 3946#endif 3947 return 0; 3948} 3949 3950static void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive) 3951{ 3952 MOD_DEC_USE_COUNT; 3953#if ONSTREAM_DEBUG 3954 printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_blkdev_release\n"); 3955#endif 3956} 3957 3958/* 3959 * idetape_pre_reset is called before an ATAPI/ATA software reset. 3960 */ 3961static void idetape_pre_reset (ide_drive_t *drive) 3962{ 3963 idetape_tape_t *tape = drive->driver_data; 3964 if (tape != NULL) 3965 set_bit (IDETAPE_IGNORE_DSC, &tape->flags); 3966} 3967 3968/* 3969 * Character device interface functions 3970 */ 3971static ide_drive_t *get_drive_ptr (kdev_t i_rdev) 3972{ 3973 unsigned int i = MINOR(i_rdev) & ~0xc0; 3974 3975 if (i >= MAX_HWIFS * MAX_DRIVES) 3976 return NULL; 3977 return (idetape_chrdevs[i].drive); 3978} 3979 3980static int idetape_onstream_space_over_filemarks_backward (ide_drive_t *drive,short mt_op,int mt_count) 3981{ 3982 idetape_tape_t *tape = drive->driver_data; 3983 int cnt = 0; 3984 int last_mark_addr; 3985 unsigned long flags; 3986 3987 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 3988 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_bwd\n", tape->name); 3989 return -EIO; 3990 } 3991 while (cnt != mt_count) { 3992 last_mark_addr = ntohl(tape->first_stage->aux->last_mark_addr); 3993 if (last_mark_addr == -1) 3994 return -EIO; 3995#if ONSTREAM_DEBUG 3996 if (tape->debug_level >= 2) 3997 printk(KERN_INFO "ide-tape: positioning to last mark at %d\n", last_mark_addr); 3998#endif 3999 idetape_position_tape(drive, last_mark_addr, 0, 0); 4000 cnt++; 4001 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 4002 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); 4003 return -EIO; 4004 } 4005 if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { 4006 printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, last_mark_addr); 4007 return -EIO; 4008 } 4009 } 4010 if (mt_op == MTBSFM) { 4011 spin_lock_irqsave(&tape->spinlock, flags); 4012 idetape_remove_stage_head (drive); 4013 tape->logical_blk_num++; 4014 spin_unlock_irqrestore(&tape->spinlock, flags); 4015 } 4016 return 0; 4017} 4018 4019/* 4020 * ADRL 1.1 compatible "slow" space filemarks fwd version 4021 * 4022 * Just scans for the filemark sequentially. 4023 */ 4024static int idetape_onstream_space_over_filemarks_forward_slow (ide_drive_t *drive,short mt_op,int mt_count) 4025{ 4026 idetape_tape_t *tape = drive->driver_data; 4027 int cnt = 0; 4028 unsigned long flags; 4029 4030 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 4031 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name); 4032 return -EIO; 4033 } 4034 while (1) { 4035 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 4036 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); 4037 return -EIO; 4038 } 4039 if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER) 4040 cnt++; 4041 if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { 4042#if ONSTREAM_DEBUG 4043 if (tape->debug_level >= 2) 4044 printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name); 4045#endif 4046 return -EIO; 4047 } 4048 if (cnt == mt_count) 4049 break; 4050 spin_lock_irqsave(&tape->spinlock, flags); 4051 idetape_remove_stage_head (drive); 4052 spin_unlock_irqrestore(&tape->spinlock, flags); 4053 } 4054 if (mt_op == MTFSF) { 4055 spin_lock_irqsave(&tape->spinlock, flags); 4056 idetape_remove_stage_head (drive); 4057 tape->logical_blk_num++; 4058 spin_unlock_irqrestore(&tape->spinlock, flags); 4059 } 4060 return 0; 4061} 4062 4063 4064/* 4065 * Fast linux specific version of OnStream FSF 4066 */ 4067static int idetape_onstream_space_over_filemarks_forward_fast (ide_drive_t *drive,short mt_op,int mt_count) 4068{ 4069 idetape_tape_t *tape = drive->driver_data; 4070 int cnt = 0, next_mark_addr; 4071 unsigned long flags; 4072 4073 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 4074 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name); 4075 return -EIO; 4076 } 4077 4078 /* 4079 * Find nearest (usually previous) marker 4080 */ 4081 while (1) { 4082 if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER) 4083 break; 4084 if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { 4085#if ONSTREAM_DEBUG 4086 if (tape->debug_level >= 2) 4087 printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name); 4088#endif 4089 return -EIO; 4090 } 4091 if (ntohl(tape->first_stage->aux->filemark_cnt) == 0) { 4092 if (tape->first_mark_addr == -1) { 4093 printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name); 4094 return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count); 4095 } 4096 idetape_position_tape(drive, tape->first_mark_addr, 0, 0); 4097 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 4098 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd_fast\n", tape->name); 4099 return -EIO; 4100 } 4101 if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { 4102 printk(KERN_INFO "ide-tape: %s: expected to find filemark at %d\n", tape->name, tape->first_mark_addr); 4103 return -EIO; 4104 } 4105 } else { 4106 if (idetape_onstream_space_over_filemarks_backward(drive, MTBSF, 1) < 0) 4107 return -EIO; 4108 mt_count++; 4109 } 4110 } 4111 cnt++; 4112 while (cnt != mt_count) { 4113 next_mark_addr = ntohl(tape->first_stage->aux->next_mark_addr); 4114 if (!next_mark_addr || next_mark_addr > tape->eod_frame_addr) { 4115 printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name); 4116 return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count - cnt); 4117#if ONSTREAM_DEBUG 4118 } else if (tape->debug_level >= 2) { 4119 printk(KERN_INFO "ide-tape: positioning to next mark at %d\n", next_mark_addr); 4120#endif 4121 } 4122 idetape_position_tape(drive, next_mark_addr, 0, 0); 4123 cnt++; 4124 if (!idetape_get_logical_blk(drive, -1, 10, 0)) { 4125 printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); 4126 return -EIO; 4127 } 4128 if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { 4129 printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, next_mark_addr); 4130 return -EIO; 4131 } 4132 } 4133 if (mt_op == MTFSF) { 4134 spin_lock_irqsave(&tape->spinlock, flags); 4135 idetape_remove_stage_head (drive); 4136 tape->logical_blk_num++; 4137 spin_unlock_irqrestore(&tape->spinlock, flags); 4138 } 4139 return 0; 4140} 4141 4142/* 4143 * idetape_space_over_filemarks is now a bit more complicated than just 4144 * passing the command to the tape since we may have crossed some 4145 * filemarks during our pipelined read-ahead mode. 4146 * 4147 * As a minor side effect, the pipeline enables us to support MTFSFM when 4148 * the filemark is in our internal pipeline even if the tape doesn't 4149 * support spacing over filemarks in the reverse direction. 4150 */ 4151static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) 4152{ 4153 idetape_tape_t *tape = drive->driver_data; 4154 idetape_pc_t pc; 4155 unsigned long flags; 4156 int retval,count=0; 4157 int speed_control; 4158 4159 if (tape->onstream) { 4160 if (tape->raw) 4161 return -EIO; 4162 speed_control = tape->speed_control; 4163 tape->speed_control = 0; 4164 if (mt_op == MTFSF || mt_op == MTFSFM) { 4165 if (tape->linux_media) 4166 retval = idetape_onstream_space_over_filemarks_forward_fast(drive, mt_op, mt_count); 4167 else 4168 retval = idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count); 4169 } else 4170 retval = idetape_onstream_space_over_filemarks_backward(drive, mt_op, mt_count); 4171 tape->speed_control = speed_control; 4172 tape->restart_speed_control_req = 1; 4173 return retval; 4174 } 4175 4176 if (tape->chrdev_direction == idetape_direction_read) { 4177 /* 4178 * We have a read-ahead buffer. Scan it for crossed 4179 * filemarks. 4180 */ 4181 tape->merge_stage_size = 0; 4182 clear_bit (IDETAPE_FILEMARK, &tape->flags); 4183 while (tape->first_stage != NULL) { 4184 idetape_wait_first_stage(drive); 4185 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) 4186 count++; 4187 if (count == mt_count) { 4188 switch (mt_op) { 4189 case MTFSF: 4190 spin_lock_irqsave(&tape->spinlock, flags); 4191 idetape_remove_stage_head (drive); 4192 spin_unlock_irqrestore(&tape->spinlock, flags); 4193 case MTFSFM: 4194 return (0); 4195 default: 4196 break; 4197 } 4198 } 4199 spin_lock_irqsave(&tape->spinlock, flags); 4200 idetape_remove_stage_head (drive); 4201 spin_unlock_irqrestore(&tape->spinlock, flags); 4202 } 4203 idetape_discard_read_pipeline (drive, 1); 4204 } 4205 4206 /* 4207 * The filemark was not found in our internal pipeline. 4208 * Now we can issue the space command. 4209 */ 4210 switch (mt_op) { 4211 case MTFSF: 4212 idetape_create_space_cmd (&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); 4213 return (idetape_queue_pc_tail (drive, &pc)); 4214 case MTFSFM: 4215 if (!tape->capabilities.sprev) 4216 return (-EIO); 4217 retval = idetape_space_over_filemarks (drive, MTFSF, mt_count-count); 4218 if (retval) return (retval); 4219 return (idetape_space_over_filemarks (drive, MTBSF, 1)); 4220 case MTBSF: 4221 if (!tape->capabilities.sprev) 4222 return (-EIO); 4223 idetape_create_space_cmd (&pc,-(mt_count+count),IDETAPE_SPACE_OVER_FILEMARK); 4224 return (idetape_queue_pc_tail (drive, &pc)); 4225 case MTBSFM: 4226 if (!tape->capabilities.sprev) 4227 return (-EIO); 4228 retval = idetape_space_over_filemarks (drive, MTBSF, mt_count+count); 4229 if (retval) return (retval); 4230 return (idetape_space_over_filemarks (drive, MTFSF, 1)); 4231 default: 4232 printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); 4233 return (-EIO); 4234 } 4235} 4236 4237 4238/* 4239 * Our character device read / write functions. 4240 * 4241 * The tape is optimized to maximize throughput when it is transferring 4242 * an integral number of the "continuous transfer limit", which is 4243 * a parameter of the specific tape (26 KB on my particular tape). 4244 * (32 kB for Onstream) 4245 * 4246 * As of version 1.3 of the driver, the character device provides an 4247 * abstract continuous view of the media - any mix of block sizes (even 1 4248 * byte) on the same backup/restore procedure is supported. The driver 4249 * will internally convert the requests to the recommended transfer unit, 4250 * so that an unmatch between the user's block size to the recommended 4251 * size will only result in a (slightly) increased driver overhead, but 4252 * will no longer hit performance. 4253 * This is not applicable to Onstream. 4254 */ 4255static ssize_t idetape_chrdev_read (struct file *file, char *buf, 4256 size_t count, loff_t *ppos) 4257{ 4258 struct inode *inode = file->f_dentry->d_inode; 4259 ide_drive_t *drive = get_drive_ptr (inode->i_rdev); 4260 idetape_tape_t *tape = drive->driver_data; 4261 ssize_t bytes_read,temp, actually_read = 0, rc; 4262 4263 if (ppos != &file->f_pos) { 4264 /* "A request was outside the capabilities of the device." */ 4265 return -ENXIO; 4266 } 4267 if (tape->onstream && (count != tape->tape_block_size)) { 4268 printk(KERN_ERR "ide-tape: %s: use %d bytes as block size (%Zd used)\n", tape->name, tape->tape_block_size, count); 4269 return -EINVAL; 4270 } 4271#if IDETAPE_DEBUG_LOG 4272 if (tape->debug_level >= 3) 4273 printk (KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); 4274#endif /* IDETAPE_DEBUG_LOG */ 4275 4276 if (tape->chrdev_direction != idetape_direction_read) { 4277 if (test_bit (IDETAPE_DETECT_BS, &tape->flags)) 4278 if (count > tape->tape_block_size && (count % tape->tape_block_size) == 0) 4279 tape->user_bs_factor = count / tape->tape_block_size; 4280 } 4281 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) 4282 return rc; 4283 if (count == 0) 4284 return (0); 4285 if (tape->merge_stage_size) { 4286 actually_read = IDE_MIN (tape->merge_stage_size, count); 4287 idetape_copy_stage_to_user (tape, buf, tape->merge_stage, actually_read); 4288 buf += actually_read; 4289 tape->merge_stage_size -= actually_read; 4290 count -= actually_read; 4291 } 4292 while (count >= tape->stage_size) { 4293 bytes_read = idetape_add_chrdev_read_request (drive, tape->capabilities.ctl); 4294 if (bytes_read <= 0) 4295 goto finish; 4296 idetape_copy_stage_to_user (tape, buf, tape->merge_stage, bytes_read); 4297 buf += bytes_read; 4298 count -= bytes_read; 4299 actually_read += bytes_read; 4300 } 4301 if (count) { 4302 bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl); 4303 if (bytes_read <= 0) 4304 goto finish; 4305 temp = IDE_MIN (count, bytes_read); 4306 idetape_copy_stage_to_user (tape, buf, tape->merge_stage, temp); 4307 actually_read += temp; 4308 tape->merge_stage_size = bytes_read-temp; 4309 } 4310finish: 4311 if (!actually_read && test_bit (IDETAPE_FILEMARK, &tape->flags)) { 4312#if IDETAPE_DEBUG_LOG 4313 if (tape->debug_level >= 2) 4314 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); 4315#endif 4316 idetape_space_over_filemarks (drive, MTFSF, 1); 4317 return 0; 4318 } 4319 if (tape->onstream && !actually_read && test_and_clear_bit(IDETAPE_READ_ERROR, &tape->flags)) { 4320 printk(KERN_ERR "ide-tape: %s: unrecovered read error on logical block number %d, skipping\n", 4321 tape->name, tape->logical_blk_num); 4322 tape->logical_blk_num++; 4323 return -EIO; 4324 } 4325 return actually_read; 4326} 4327 4328static void idetape_update_last_marker (ide_drive_t *drive, int last_mark_addr, int next_mark_addr) 4329{ 4330 idetape_tape_t *tape = drive->driver_data; 4331 idetape_stage_t *stage; 4332 os_aux_t *aux; 4333 int position; 4334 4335 if (!tape->onstream || tape->raw) 4336 return; 4337 if (last_mark_addr == -1) 4338 return; 4339 stage = __idetape_kmalloc_stage(tape, 0, 0); 4340 if (stage == NULL) 4341 return; 4342 idetape_flush_tape_buffers(drive); 4343 position = idetape_read_position(drive); 4344#if ONSTREAM_DEBUG 4345 if (tape->debug_level >= 2) 4346 printk(KERN_INFO "ide-tape: current position (2) %d, lblk %d\n", position, tape->logical_blk_num); 4347 if (tape->debug_level >= 2) 4348 printk(KERN_INFO "ide-tape: current position (2) tape block %d\n", tape->last_frame_position); 4349#endif 4350 idetape_position_tape(drive, last_mark_addr, 0, 0); 4351 if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bh)) { 4352 printk(KERN_INFO "ide-tape: %s: couldn't read last marker\n", tape->name); 4353 __idetape_kfree_stage (stage); 4354 idetape_position_tape(drive, position, 0, 0); 4355 return; 4356 } 4357 aux = stage->aux; 4358 if (aux->frame_type != OS_FRAME_TYPE_MARKER) { 4359 printk(KERN_INFO "ide-tape: %s: expected to find marker at addr %d\n", tape->name, last_mark_addr); 4360 __idetape_kfree_stage (stage); 4361 idetape_position_tape(drive, position, 0, 0); 4362 return; 4363 } 4364#if ONSTREAM_DEBUG 4365 if (tape->debug_level >= 2) 4366 printk(KERN_INFO "ide-tape: writing back marker\n"); 4367#endif 4368 aux->next_mark_addr = htonl(next_mark_addr); 4369 idetape_position_tape(drive, last_mark_addr, 0, 0); 4370 if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) { 4371 printk(KERN_INFO "ide-tape: %s: couldn't write back marker frame at %d\n", tape->name, last_mark_addr); 4372 __idetape_kfree_stage (stage); 4373 idetape_position_tape(drive, position, 0, 0); 4374 return; 4375 } 4376 __idetape_kfree_stage (stage); 4377 idetape_flush_tape_buffers (drive); 4378 idetape_position_tape(drive, position, 0, 0); 4379 return; 4380} 4381 4382static void idetape_write_filler (ide_drive_t *drive, int block, int cnt) 4383{ 4384 idetape_tape_t *tape = drive->driver_data; 4385 idetape_stage_t *stage; 4386 int rc; 4387 4388 if (!tape->onstream || tape->raw) 4389 return; 4390 stage = __idetape_kmalloc_stage(tape, 1, 1); 4391 if (stage == NULL) 4392 return; 4393 idetape_init_stage(drive, stage, OS_FRAME_TYPE_FILL, 0); 4394 idetape_wait_ready(drive, 60 * 5 * HZ); 4395 rc = idetape_position_tape(drive, block, 0, 0); 4396#if ONSTREAM_DEBUG 4397 printk(KERN_INFO "write_filler: positioning failed it returned %d\n", rc); 4398#endif 4399 if (rc != 0) 4400 return; /* don't write fillers if we cannot position the tape. */ 4401 4402 strcpy(stage->bh->b_data, "Filler"); 4403 while (cnt--) { 4404 if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) { 4405 printk(KERN_INFO "ide-tape: %s: write_filler: couldn't write header frame\n", tape->name); 4406 __idetape_kfree_stage (stage); 4407 return; 4408 } 4409 } 4410 __idetape_kfree_stage (stage); 4411} 4412 4413static void __idetape_write_header (ide_drive_t *drive, int block, int cnt) 4414{ 4415 idetape_tape_t *tape = drive->driver_data; 4416 idetape_stage_t *stage; 4417 os_header_t header; 4418 4419 stage = __idetape_kmalloc_stage(tape, 1, 1); 4420 if (stage == NULL) 4421 return; 4422 idetape_init_stage(drive, stage, OS_FRAME_TYPE_HEADER, tape->logical_blk_num); 4423 idetape_wait_ready(drive, 60 * 5 * HZ); 4424 idetape_position_tape(drive, block, 0, 0); 4425 memset(&header, 0, sizeof(header)); 4426 strcpy(header.ident_str, "ADR_SEQ"); 4427 header.major_rev = 1; 4428 header.minor_rev = OS_ADR_MINREV; 4429 header.par_num = 1; 4430 header.partition.partition_num = OS_DATA_PARTITION; 4431 header.partition.par_desc_ver = OS_PARTITION_VERSION; 4432 header.partition.first_frame_addr = htonl(OS_DATA_STARTFRAME1); 4433 header.partition.last_frame_addr = htonl(tape->capacity); 4434 header.partition.wrt_pass_cntr = htons(tape->wrt_pass_cntr); 4435 header.partition.eod_frame_addr = htonl(tape->eod_frame_addr); 4436 memcpy(stage->bh->b_data, &header, sizeof(header)); 4437 while (cnt--) { 4438 if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bh)) { 4439 printk(KERN_INFO "ide-tape: %s: couldn't write header frame\n", tape->name); 4440 __idetape_kfree_stage (stage); 4441 return; 4442 } 4443 } 4444 __idetape_kfree_stage (stage); 4445 idetape_flush_tape_buffers (drive); 4446} 4447 4448static void idetape_write_header (ide_drive_t *drive, int locate_eod) 4449{ 4450 idetape_tape_t *tape = drive->driver_data; 4451 4452#if ONSTREAM_DEBUG 4453 if (tape->debug_level >= 2) 4454 printk(KERN_INFO "ide-tape: %s: writing tape header\n", tape->name); 4455#endif 4456 if (!tape->onstream || tape->raw) 4457 return; 4458 tape->update_frame_cntr++; 4459 __idetape_write_header(drive, 5, 5); 4460 __idetape_write_header(drive, 0xbae, 5); /* 2990 */ 4461 if (locate_eod) { 4462#if ONSTREAM_DEBUG 4463 if (tape->debug_level >= 2) 4464 printk(KERN_INFO "ide-tape: %s: locating back to eod frame addr %d\n", tape->name, tape->eod_frame_addr); 4465#endif 4466 idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); 4467 } 4468} 4469 4470static ssize_t idetape_chrdev_write (struct file *file, const char *buf, 4471 size_t count, loff_t *ppos) 4472{ 4473 struct inode *inode = file->f_dentry->d_inode; 4474 ide_drive_t *drive = get_drive_ptr (inode->i_rdev); 4475 idetape_tape_t *tape = drive->driver_data; 4476 ssize_t retval, actually_written = 0; 4477 int position; 4478 4479 if (ppos != &file->f_pos) { 4480 /* "A request was outside the capabilities of the device." */ 4481 return -ENXIO; 4482 } 4483 4484#if IDETAPE_DEBUG_LOG 4485 if (tape->debug_level >= 3) 4486 printk (KERN_INFO "ide-tape: Reached idetape_chrdev_write, count %Zd\n", count); 4487#endif /* IDETAPE_DEBUG_LOG */ 4488 4489 if (tape->onstream) { 4490 if (count != tape->tape_block_size) { 4491 printk(KERN_ERR "ide-tape: %s: chrdev_write: use %d bytes as block size (%Zd used)\n", 4492 tape->name, tape->tape_block_size, count); 4493 return -EINVAL; 4494 } 4495 /* 4496 * Check if we reach the end of the tape. Just assume the whole pipeline 4497 * is filled with write requests! 4498 */ 4499 if (tape->first_frame_position + tape->nr_stages >= tape->capacity - OS_EW) { 4500#if ONSTREAM_DEBUG 4501 printk(KERN_INFO, "chrdev_write: Write truncated at EOM early warning"); 4502#endif 4503 if (tape->chrdev_direction == idetape_direction_write) 4504 idetape_write_release(inode); 4505 return -ENOSPC; 4506 } 4507 } 4508 4509 if (tape->chrdev_direction != idetape_direction_write) { /* Initialize write operation */ 4510 if (tape->chrdev_direction == idetape_direction_read) 4511 idetape_discard_read_pipeline (drive, 1); 4512#if IDETAPE_DEBUG_BUGS 4513 if (tape->merge_stage || tape->merge_stage_size) { 4514 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); 4515 tape->merge_stage_size = 0; 4516 } 4517#endif /* IDETAPE_DEBUG_BUGS */ 4518 if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL) 4519 return -ENOMEM; 4520 tape->chrdev_direction = idetape_direction_write; 4521 idetape_init_merge_stage (tape); 4522 4523 if (tape->onstream) { 4524 position = idetape_read_position(drive); 4525 if (position <= OS_DATA_STARTFRAME1) { 4526 tape->logical_blk_num = 0; 4527 tape->wrt_pass_cntr++; 4528#if ONSTREAM_DEBUG 4529 if (tape->debug_level >= 2) 4530 printk(KERN_INFO "ide-tape: %s: logical block num 0, setting eod to %d\n", tape->name, OS_DATA_STARTFRAME1); 4531 if (tape->debug_level >= 2) 4532 printk(KERN_INFO "ide-tape: %s: allocating new write pass counter %d\n", tape->name, tape->wrt_pass_cntr); 4533#endif 4534 tape->filemark_cnt = 0; 4535 tape->eod_frame_addr = OS_DATA_STARTFRAME1; 4536 tape->first_mark_addr = tape->last_mark_addr = -1; 4537 idetape_write_header(drive, 1); 4538 } 4539#if ONSTREAM_DEBUG 4540 if (tape->debug_level >= 2) 4541 printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr); 4542#endif 4543 position = idetape_read_position(drive); 4544 if (position != tape->eod_frame_addr) 4545 idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); 4546#if ONSTREAM_DEBUG 4547 if (tape->debug_level >= 2) 4548 printk(KERN_INFO "ide-tape: %s: first_frame_position %d\n", tape->name, tape->first_frame_position); 4549#endif 4550 } 4551 4552 /* 4553 * Issue a write 0 command to ensure that DSC handshake 4554 * is switched from completion mode to buffer available 4555 * mode. 4556 */ 4557 retval = idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 0, tape->merge_stage->bh); 4558 if (retval < 0) { 4559 kfree (tape->merge_stage); 4560 tape->merge_stage = NULL; 4561 tape->chrdev_direction = idetape_direction_none; 4562 return retval; 4563 } 4564#if ONSTREAM_DEBUG 4565 if (tape->debug_level >= 2) 4566 printk("ide-tape: first_frame_position %d\n", tape->first_frame_position); 4567#endif 4568 } 4569 if (count == 0) 4570 return (0); 4571 if (tape->restart_speed_control_req) 4572 idetape_restart_speed_control(drive); 4573 if (tape->merge_stage_size) { 4574#if IDETAPE_DEBUG_BUGS 4575 if (tape->merge_stage_size >= tape->stage_size) { 4576 printk (KERN_ERR "ide-tape: bug: merge buffer too big\n"); 4577 tape->merge_stage_size = 0; 4578 } 4579#endif /* IDETAPE_DEBUG_BUGS */ 4580 actually_written = IDE_MIN (tape->stage_size - tape->merge_stage_size, count); 4581 idetape_copy_stage_from_user (tape, tape->merge_stage, buf, actually_written); 4582 buf += actually_written; 4583 tape->merge_stage_size += actually_written; 4584 count -= actually_written; 4585 4586 if (tape->merge_stage_size == tape->stage_size) { 4587 tape->merge_stage_size = 0; 4588 retval = idetape_add_chrdev_write_request (drive, tape->capabilities.ctl); 4589 if (retval <= 0) 4590 return (retval); 4591 } 4592 } 4593 while (count >= tape->stage_size) { 4594 idetape_copy_stage_from_user (tape, tape->merge_stage, buf, tape->stage_size); 4595 buf += tape->stage_size; 4596 count -= tape->stage_size; 4597 retval = idetape_add_chrdev_write_request (drive, tape->capabilities.ctl); 4598 actually_written += tape->stage_size; 4599 if (retval <= 0) 4600 return (retval); 4601 } 4602 if (count) { 4603 actually_written+=count; 4604 idetape_copy_stage_from_user (tape, tape->merge_stage, buf, count); 4605 tape->merge_stage_size += count; 4606 } 4607 return (actually_written); 4608} 4609 4610static int idetape_write_filemark (ide_drive_t *drive) 4611{ 4612 idetape_tape_t *tape = drive->driver_data; 4613 int last_mark_addr; 4614 idetape_pc_t pc; 4615 4616 if (!tape->onstream) { 4617 idetape_create_write_filemark_cmd(drive, &pc, 1); /* Write a filemark */ 4618 if (idetape_queue_pc_tail (drive, &pc)) { 4619 printk (KERN_ERR "ide-tape: Couldn't write a filemark\n"); 4620 return -EIO; 4621 } 4622 } else if (!tape->raw) { 4623 last_mark_addr = idetape_read_position(drive); 4624 tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); 4625 if (tape->merge_stage != NULL) { 4626 idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_MARKER, tape->logical_blk_num); 4627 idetape_pad_zeros (drive, tape->stage_size); 4628 tape->logical_blk_num++; 4629 __idetape_kfree_stage (tape->merge_stage); 4630 tape->merge_stage = NULL; 4631 } 4632 if (tape->filemark_cnt) 4633 idetape_update_last_marker(drive, tape->last_mark_addr, last_mark_addr); 4634 tape->last_mark_addr = last_mark_addr; 4635 if (tape->filemark_cnt++ == 0) 4636 tape->first_mark_addr = last_mark_addr; 4637 } 4638 return 0; 4639} 4640 4641static void idetape_write_eod (ide_drive_t *drive) 4642{ 4643 idetape_tape_t *tape = drive->driver_data; 4644 4645 if (!tape->onstream || tape->raw) 4646 return; 4647 tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); 4648 if (tape->merge_stage != NULL) { 4649 tape->eod_frame_addr = idetape_read_position(drive); 4650 idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_EOD, tape->logical_blk_num); 4651 idetape_pad_zeros (drive, tape->stage_size); 4652 __idetape_kfree_stage (tape->merge_stage); 4653 tape->merge_stage = NULL; 4654 } 4655 return; 4656} 4657 4658int idetape_seek_logical_blk (ide_drive_t *drive, int logical_blk_num) 4659{ 4660 idetape_tape_t *tape = drive->driver_data; 4661 int estimated_address = logical_blk_num + 20; 4662 int retries = 0; 4663 int speed_control; 4664 4665 speed_control = tape->speed_control; 4666 tape->speed_control = 0; 4667 if (logical_blk_num < 0) 4668 logical_blk_num = 0; 4669 if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1)) 4670 goto ok; 4671 while (++retries < 10) { 4672 idetape_discard_read_pipeline(drive, 0); 4673 idetape_position_tape(drive, estimated_address, 0, 0); 4674 if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1)) 4675 goto ok; 4676 if (!idetape_get_logical_blk(drive, -1, 10, 1)) 4677 goto error; 4678 if (tape->logical_blk_num < logical_blk_num) 4679 estimated_address += logical_blk_num - tape->logical_blk_num; 4680 else 4681 break; 4682 } 4683error: 4684 tape->speed_control = speed_control; 4685 tape->restart_speed_control_req = 1; 4686 printk(KERN_INFO "ide-tape: %s: couldn't seek to logical block %d (at %d), %d retries\n", tape->name, logical_blk_num, tape->logical_blk_num, retries); 4687 return -EIO; 4688ok: 4689 tape->speed_control = speed_control; 4690 tape->restart_speed_control_req = 1; 4691 return 0; 4692} 4693 4694/* 4695 * idetape_mtioctop is called from idetape_chrdev_ioctl when 4696 * the general mtio MTIOCTOP ioctl is requested. 4697 * 4698 * We currently support the following mtio.h operations: 4699 * 4700 * MTFSF - Space over mt_count filemarks in the positive direction. 4701 * The tape is positioned after the last spaced filemark. 4702 * 4703 * MTFSFM - Same as MTFSF, but the tape is positioned before the 4704 * last filemark. 4705 * 4706 * MTBSF - Steps background over mt_count filemarks, tape is 4707 * positioned before the last filemark. 4708 * 4709 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. 4710 * 4711 * Note: 4712 * 4713 * MTBSF and MTBSFM are not supported when the tape doesn't 4714 * supports spacing over filemarks in the reverse direction. 4715 * In this case, MTFSFM is also usually not supported (it is 4716 * supported in the rare case in which we crossed the filemark 4717 * during our read-ahead pipelined operation mode). 4718 * 4719 * MTWEOF - Writes mt_count filemarks. Tape is positioned after 4720 * the last written filemark. 4721 * 4722 * MTREW - Rewinds tape. 4723 * 4724 * MTLOAD - Loads the tape. 4725 * 4726 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and 4727 * MTUNLOAD prevents further access until the media is replaced. 4728 * 4729 * MTNOP - Flushes tape buffers. 4730 * 4731 * MTRETEN - Retension media. This typically consists of one end 4732 * to end pass on the media. 4733 * 4734 * MTEOM - Moves to the end of recorded data. 4735 * 4736 * MTERASE - Erases tape. 4737 * 4738 * MTSETBLK - Sets the user block size to mt_count bytes. If 4739 * mt_count is 0, we will attempt to autodetect 4740 * the block size. 4741 * 4742 * MTSEEK - Positions the tape in a specific block number, where 4743 * each block is assumed to contain which user_block_size 4744 * bytes. 4745 * 4746 * MTSETPART - Switches to another tape partition. 4747 * 4748 * MTLOCK - Locks the tape door. 4749 * 4750 * MTUNLOCK - Unlocks the tape door. 4751 * 4752 * The following commands are currently not supported: 4753 * 4754 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, 4755 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. 4756 */ 4757static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) 4758{ 4759 idetape_tape_t *tape = drive->driver_data; 4760 idetape_pc_t pc; 4761 int i,retval; 4762 4763#if IDETAPE_DEBUG_LOG 4764 if (tape->debug_level >= 1) 4765 printk (KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",mt_op,mt_count); 4766#endif /* IDETAPE_DEBUG_LOG */ 4767 /* 4768 * Commands which need our pipelined read-ahead stages. 4769 */ 4770 switch (mt_op) { 4771 case MTFSF: 4772 case MTFSFM: 4773 case MTBSF: 4774 case MTBSFM: 4775 if (!mt_count) 4776 return (0); 4777 return (idetape_space_over_filemarks (drive,mt_op,mt_count)); 4778 default: 4779 break; 4780 } 4781 switch (mt_op) { 4782 case MTWEOF: 4783 idetape_discard_read_pipeline (drive, 1); 4784 for (i = 0; i < mt_count; i++) { 4785 retval = idetape_write_filemark(drive); 4786 if (retval) return retval; 4787 } 4788 return (0); 4789 case MTREW: 4790 idetape_discard_read_pipeline (drive, 0); 4791 if (idetape_rewind_tape(drive)) 4792 return -EIO; 4793 if (tape->onstream && !tape->raw) 4794 return idetape_position_tape(drive, OS_DATA_STARTFRAME1, 0, 0); 4795 return 0; 4796 case MTLOAD: 4797 idetape_discard_read_pipeline (drive, 0); 4798 idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK); 4799 return (idetape_queue_pc_tail (drive, &pc)); 4800 case MTUNLOAD: 4801 case MTOFFL: 4802 idetape_discard_read_pipeline (drive, 0); 4803 idetape_create_load_unload_cmd (drive, &pc,!IDETAPE_LU_LOAD_MASK); 4804 return (idetape_queue_pc_tail (drive, &pc)); 4805 case MTNOP: 4806 idetape_discard_read_pipeline (drive, 0); 4807 return (idetape_flush_tape_buffers (drive)); 4808 case MTRETEN: 4809 idetape_discard_read_pipeline (drive, 0); 4810 idetape_create_load_unload_cmd (drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 4811 return (idetape_queue_pc_tail (drive, &pc)); 4812 case MTEOM: 4813 if (tape->onstream) { 4814#if ONSTREAM_DEBUG 4815 if (tape->debug_level >= 2) 4816 printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr); 4817#endif 4818 idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); 4819 if (!idetape_get_logical_blk(drive, -1, 10, 0)) 4820 return -EIO; 4821 if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_EOD) 4822 return -EIO; 4823 return 0; 4824 } 4825 idetape_create_space_cmd (&pc, 0, IDETAPE_SPACE_TO_EOD); 4826 return (idetape_queue_pc_tail (drive, &pc)); 4827 case MTERASE: 4828 if (tape->onstream) { 4829 tape->eod_frame_addr = OS_DATA_STARTFRAME1; 4830 tape->logical_blk_num = 0; 4831 tape->first_mark_addr = tape->last_mark_addr = -1; 4832 idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); 4833 idetape_write_eod(drive); 4834 idetape_flush_tape_buffers (drive); 4835 idetape_write_header(drive, 0); 4836 /* 4837 * write filler frames to the unused frames... 4838 * REMOVE WHEN going to LIN4 application type... 4839 */ 4840 idetape_write_filler(drive, OS_DATA_STARTFRAME1 - 10, 10); 4841 idetape_write_filler(drive, OS_DATA_ENDFRAME1, 10); 4842 idetape_flush_tape_buffers (drive); 4843 (void) idetape_rewind_tape (drive); 4844 return 0; 4845 } 4846 (void) idetape_rewind_tape (drive); 4847 idetape_create_erase_cmd (&pc); 4848 return (idetape_queue_pc_tail (drive, &pc)); 4849 case MTSETBLK: 4850 if (tape->onstream) { 4851 if (mt_count != tape->tape_block_size) { 4852 printk(KERN_INFO "ide-tape: %s: MTSETBLK %d -- only %d bytes block size supported\n", tape->name, mt_count, tape->tape_block_size); 4853 return -EINVAL; 4854 } 4855 return 0; 4856 } 4857 if (mt_count) { 4858 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) 4859 return -EIO; 4860 tape->user_bs_factor = mt_count / tape->tape_block_size; 4861 clear_bit (IDETAPE_DETECT_BS, &tape->flags); 4862 } else 4863 set_bit (IDETAPE_DETECT_BS, &tape->flags); 4864 return 0; 4865 case MTSEEK: 4866 if (!tape->onstream || tape->raw) { 4867 idetape_discard_read_pipeline (drive, 0); 4868 return idetape_position_tape (drive, mt_count * tape->user_bs_factor, tape->partition, 0); 4869 } 4870 return idetape_seek_logical_blk(drive, mt_count); 4871 case MTSETPART: 4872 idetape_discard_read_pipeline (drive, 0); 4873 if (tape->onstream) 4874 return -EIO; 4875 return (idetape_position_tape (drive, 0, mt_count, 0)); 4876 case MTFSR: 4877 case MTBSR: 4878 if (tape->onstream) { 4879 if (!idetape_get_logical_blk(drive, -1, 10, 0)) 4880 return -EIO; 4881 if (mt_op == MTFSR) 4882 return idetape_seek_logical_blk(drive, tape->logical_blk_num + mt_count); 4883 else { 4884 idetape_discard_read_pipeline (drive, 0); 4885 return idetape_seek_logical_blk(drive, tape->logical_blk_num - mt_count); 4886 } 4887 } 4888 case MTLOCK: 4889 if (!idetape_create_prevent_cmd(drive, &pc, 1)) 4890 return 0; 4891 retval = idetape_queue_pc_tail (drive, &pc); 4892 if (retval) return retval; 4893 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 4894 return 0; 4895 case MTUNLOCK: 4896 if (!idetape_create_prevent_cmd(drive, &pc, 0)) 4897 return 0; 4898 retval = idetape_queue_pc_tail (drive, &pc); 4899 if (retval) return retval; 4900 tape->door_locked = DOOR_UNLOCKED; 4901 return 0; 4902 default: 4903 printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); 4904 return (-EIO); 4905 } 4906} 4907 4908/* 4909 * Our character device ioctls. 4910 * 4911 * General mtio.h magnetic io commands are supported here, and not in 4912 * the corresponding block interface. 4913 * 4914 * The following ioctls are supported: 4915 * 4916 * MTIOCTOP - Refer to idetape_mtioctop for detailed description. 4917 * 4918 * MTIOCGET - The mt_dsreg field in the returned mtget structure 4919 * will be set to (user block size in bytes << 4920 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. 4921 * 4922 * The mt_blkno is set to the current user block number. 4923 * The other mtget fields are not supported. 4924 * 4925 * MTIOCPOS - The current tape "block position" is returned. We 4926 * assume that each block contains user_block_size 4927 * bytes. 4928 * 4929 * Our own ide-tape ioctls are supported on both interfaces. 4930 */ 4931static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 4932{ 4933 ide_drive_t *drive = get_drive_ptr (inode->i_rdev); 4934 idetape_tape_t *tape = drive->driver_data; 4935 struct mtop mtop; 4936 struct mtget mtget; 4937 struct mtpos mtpos; 4938 int block_offset = 0, position = tape->first_frame_position; 4939 4940#if IDETAPE_DEBUG_LOG 4941 if (tape->debug_level >= 3) 4942 printk (KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, cmd=%u\n",cmd); 4943#endif /* IDETAPE_DEBUG_LOG */ 4944 4945 tape->restart_speed_control_req = 1; 4946 if (tape->chrdev_direction == idetape_direction_write) { 4947 idetape_empty_write_pipeline (drive); 4948 idetape_flush_tape_buffers (drive); 4949 } 4950 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 4951 block_offset = idetape_pipeline_size (drive) / (tape->tape_block_size * tape->user_bs_factor); 4952 if ((position = idetape_read_position(drive)) < 0) 4953 return -EIO; 4954 } 4955 switch (cmd) { 4956 case MTIOCTOP: 4957 if (copy_from_user ((char *) &mtop, (char *) arg, sizeof (struct mtop))) 4958 return -EFAULT; 4959 return (idetape_mtioctop (drive,mtop.mt_op,mtop.mt_count)); 4960 case MTIOCGET: 4961 memset (&mtget, 0, sizeof (struct mtget)); 4962 mtget.mt_type = MT_ISSCSI2; 4963 if (!tape->onstream || tape->raw) 4964 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 4965 else { 4966 if (!idetape_get_logical_blk(drive, -1, 10, 0)) 4967 mtget.mt_blkno = -1; 4968 else 4969 mtget.mt_blkno = tape->logical_blk_num; 4970 } 4971 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 4972 if (tape->onstream) { 4973 mtget.mt_gstat |= GMT_ONLINE(0xffffffff); 4974 if (tape->first_stage && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) 4975 mtget.mt_gstat |= GMT_EOD(0xffffffff); 4976 if (position <= OS_DATA_STARTFRAME1) 4977 mtget.mt_gstat |= GMT_BOT(0xffffffff); 4978 } 4979 if (copy_to_user ((char *) arg,(char *) &mtget, sizeof (struct mtget))) 4980 return -EFAULT; 4981 return 0; 4982 case MTIOCPOS: 4983 if (tape->onstream && !tape->raw) { 4984 if (!idetape_get_logical_blk(drive, -1, 10, 0)) 4985 return -EIO; 4986 mtpos.mt_blkno = tape->logical_blk_num; 4987 } else 4988 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 4989 if (copy_to_user ((char *) arg,(char *) &mtpos, sizeof (struct mtpos))) 4990 return -EFAULT; 4991 return 0; 4992 default: 4993 if (tape->chrdev_direction == idetape_direction_read) 4994 idetape_discard_read_pipeline (drive, 1); 4995 return (idetape_blkdev_ioctl (drive,inode,file,cmd,arg)); 4996 } 4997} 4998 4999static int __idetape_analyze_headers (ide_drive_t *drive, int block) 5000{ 5001 idetape_tape_t *tape = drive->driver_data; 5002 idetape_stage_t *stage; 5003 os_header_t *header; 5004 os_aux_t *aux; 5005 5006 if (!tape->onstream || tape->raw) { 5007 tape->header_ok = tape->linux_media = 1; 5008 return 1; 5009 } 5010 tape->header_ok = tape->linux_media = 0; 5011 tape->update_frame_cntr = 0; 5012 tape->wrt_pass_cntr = 0; 5013 tape->eod_frame_addr = OS_DATA_STARTFRAME1; 5014 tape->first_mark_addr = tape->last_mark_addr = -1; 5015 stage = __idetape_kmalloc_stage (tape, 0, 0); 5016 if (stage == NULL) 5017 return 0; 5018#if ONSTREAM_DEBUG 5019 if (tape->debug_level >= 2) 5020 printk(KERN_INFO "ide-tape: %s: reading header\n", tape->name); 5021#endif 5022 idetape_position_tape(drive, block, 0, 0); 5023 if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bh)) { 5024 printk(KERN_INFO "ide-tape: %s: couldn't read header frame\n", tape->name); 5025 __idetape_kfree_stage (stage); 5026 return 0; 5027 } 5028 header = (os_header_t *) stage->bh->b_data; 5029 aux = stage->aux; 5030 if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0) { 5031 printk(KERN_INFO "ide-tape: %s: invalid header identification string\n", tape->name); 5032 __idetape_kfree_stage (stage); 5033 return 0; 5034 } 5035 if (header->major_rev != 1 || (header->minor_rev > OS_ADR_MINREV)) 5036 printk(KERN_INFO "ide-tape: warning: revision %d.%d detected (up to 1.%d supported)\n", header->major_rev, header->minor_rev, OS_ADR_MINREV); 5037 if (header->par_num != 1) 5038 printk(KERN_INFO "ide-tape: warning: %d partitions defined, only one supported\n", header->par_num); 5039 tape->wrt_pass_cntr = ntohs(header->partition.wrt_pass_cntr); 5040 tape->eod_frame_addr = ntohl(header->partition.eod_frame_addr); 5041 tape->filemark_cnt = ntohl(aux->filemark_cnt); 5042 tape->first_mark_addr = ntohl(aux->next_mark_addr); 5043 tape->last_mark_addr = ntohl(aux->last_mark_addr); 5044 tape->update_frame_cntr = ntohl(aux->update_frame_cntr); 5045 memcpy(tape->application_sig, aux->application_sig, 4); 5046 tape->application_sig[4] = 0; 5047 if (memcmp(tape->application_sig, "LIN", 3) == 0) { 5048 tape->linux_media = 1; 5049 tape->linux_media_version = tape->application_sig[3] - '0'; 5050 if (tape->linux_media_version != 3) 5051 printk(KERN_INFO "ide-tape: %s: Linux media version %d detected (current 3)\n", 5052 tape->name, tape->linux_media_version); 5053 } else { 5054 printk(KERN_INFO "ide-tape: %s: non Linux media detected (%s)\n", tape->name, tape->application_sig); 5055 tape->linux_media = 0; 5056 } 5057#if ONSTREAM_DEBUG 5058 if (tape->debug_level >= 2) 5059 printk(KERN_INFO "ide-tape: %s: detected write pass counter %d, eod frame addr %d\n", tape->name, tape->wrt_pass_cntr, tape->eod_frame_addr); 5060#endif 5061 __idetape_kfree_stage (stage); 5062 return 1; 5063} 5064 5065static int idetape_analyze_headers (ide_drive_t *drive) 5066{ 5067 idetape_tape_t *tape = drive->driver_data; 5068 int position, block; 5069 5070 if (!tape->onstream || tape->raw) { 5071 tape->header_ok = tape->linux_media = 1; 5072 return 1; 5073 } 5074 tape->header_ok = tape->linux_media = 0; 5075 position = idetape_read_position(drive); 5076 for (block = 5; block < 10; block++) 5077 if (__idetape_analyze_headers(drive, block)) 5078 goto ok; 5079 for (block = 0xbae; block < 0xbb3; block++) /* 2990 - 2994 */ 5080 if (__idetape_analyze_headers(drive, block)) 5081 goto ok; 5082 printk(KERN_ERR "ide-tape: %s: failed to find valid ADRL header\n", tape->name); 5083 return 0; 5084ok: 5085 if (position < OS_DATA_STARTFRAME1) 5086 position = OS_DATA_STARTFRAME1; 5087 idetape_position_tape(drive, position, 0, 0); 5088 tape->header_ok = 1; 5089 return 1; 5090} 5091 5092/* 5093 * Our character device open function. 5094 */ 5095static int idetape_chrdev_open (struct inode *inode, struct file *filp) 5096{ 5097 ide_drive_t *drive; 5098 idetape_tape_t *tape; 5099 idetape_pc_t pc; 5100 unsigned int minor=MINOR (inode->i_rdev); 5101 5102#if IDETAPE_DEBUG_LOG 5103 printk (KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); 5104#endif /* IDETAPE_DEBUG_LOG */ 5105 5106 if ((drive = get_drive_ptr (inode->i_rdev)) == NULL) 5107 return -ENXIO; 5108 tape = drive->driver_data; 5109 5110 if (test_and_set_bit (IDETAPE_BUSY, &tape->flags)) 5111 return -EBUSY; 5112 MOD_INC_USE_COUNT; 5113 if (!tape->onstream) { 5114 idetape_read_position(drive); 5115 if (!test_bit (IDETAPE_ADDRESS_VALID, &tape->flags)) 5116 (void) idetape_rewind_tape (drive); 5117 } else { 5118 if (minor & 64) { 5119 tape->tape_block_size = tape->stage_size = 32768 + 512; 5120 tape->raw = 1; 5121 } else { 5122 tape->tape_block_size = tape->stage_size = 32768; 5123 tape->raw = 0; 5124 } 5125 idetape_onstream_mode_sense_tape_parameter_page(drive, tape->debug_level); 5126 } 5127 if (idetape_wait_ready(drive, 60 * HZ)) { 5128 clear_bit(IDETAPE_BUSY, &tape->flags); 5129 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 5130 MOD_DEC_USE_COUNT; 5131 return -EBUSY; 5132 } 5133 idetape_read_position(drive); 5134 MOD_DEC_USE_COUNT; 5135 clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); 5136 5137 if (tape->chrdev_direction == idetape_direction_none) { 5138 MOD_INC_USE_COUNT; 5139 if (idetape_create_prevent_cmd(drive, &pc, 1)) { 5140 if (!idetape_queue_pc_tail (drive, &pc)) { 5141 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 5142 tape->door_locked = DOOR_LOCKED; 5143 } 5144 } 5145 idetape_analyze_headers(drive); 5146 } 5147 tape->max_frames = tape->cur_frames = tape->req_buffer_fill = 0; 5148 idetape_restart_speed_control(drive); 5149 tape->restart_speed_control_req = 0; 5150 return 0; 5151} 5152 5153static void idetape_write_release (struct inode *inode) 5154{ 5155 ide_drive_t *drive = get_drive_ptr (inode->i_rdev); 5156 idetape_tape_t *tape = drive->driver_data; 5157 unsigned int minor=MINOR (inode->i_rdev); 5158 5159 idetape_empty_write_pipeline (drive); 5160 tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); 5161 if (tape->merge_stage != NULL) { 5162 idetape_pad_zeros (drive, tape->tape_block_size * (tape->user_bs_factor - 1)); 5163 __idetape_kfree_stage (tape->merge_stage); 5164 tape->merge_stage = NULL; 5165 } 5166 idetape_write_filemark(drive); 5167 idetape_write_eod(drive); 5168 idetape_flush_tape_buffers (drive); 5169 idetape_write_header(drive, minor >= 128); 5170 idetape_flush_tape_buffers (drive); 5171 5172 return; 5173} 5174 5175/* 5176 * Our character device release function. 5177 */ 5178static int idetape_chrdev_release (struct inode *inode, struct file *filp) 5179{ 5180 ide_drive_t *drive = get_drive_ptr (inode->i_rdev); 5181 idetape_tape_t *tape; 5182 idetape_pc_t pc; 5183 unsigned int minor=MINOR (inode->i_rdev); 5184 5185 lock_kernel(); 5186 tape = drive->driver_data; 5187#if IDETAPE_DEBUG_LOG 5188 if (tape->debug_level >= 3) 5189 printk (KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); 5190#endif /* IDETAPE_DEBUG_LOG */ 5191 5192 if (tape->chrdev_direction == idetape_direction_write) { 5193 idetape_write_release(inode); 5194 } 5195 if (tape->chrdev_direction == idetape_direction_read) { 5196 if (minor < 128) 5197 idetape_discard_read_pipeline (drive, 1); 5198 else 5199 idetape_wait_for_pipeline (drive); 5200 } 5201 if (tape->cache_stage != NULL) { 5202 __idetape_kfree_stage (tape->cache_stage); 5203 tape->cache_stage = NULL; 5204 } 5205 if (minor < 128) 5206 (void) idetape_rewind_tape (drive); 5207 if (tape->chrdev_direction == idetape_direction_none) { 5208 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) { 5209 if (idetape_create_prevent_cmd(drive, &pc, 0)) 5210 if (!idetape_queue_pc_tail (drive, &pc)) 5211 tape->door_locked = DOOR_UNLOCKED; 5212 } 5213 MOD_DEC_USE_COUNT; 5214 } 5215 clear_bit (IDETAPE_BUSY, &tape->flags); 5216 unlock_kernel(); 5217 return 0; 5218} 5219 5220/* 5221 * idetape_identify_device is called to check the contents of the 5222 * ATAPI IDENTIFY command results. We return: 5223 * 5224 * 1 If the tape can be supported by us, based on the information 5225 * we have so far. 5226 * 5227 * 0 If this tape driver is not currently supported by us. 5228 */ 5229static int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id) 5230{ 5231 struct idetape_id_gcw gcw; 5232#if IDETAPE_DEBUG_INFO 5233 unsigned short mask,i; 5234#endif /* IDETAPE_DEBUG_INFO */ 5235 5236 if (!id) 5237 return 0; 5238 5239 *((unsigned short *) &gcw) = id->config; 5240 5241#if IDETAPE_DEBUG_INFO 5242 printk (KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); 5243 printk (KERN_INFO "ide-tape: Protocol Type: "); 5244 switch (gcw.protocol) { 5245 case 0: case 1: printk (KERN_INFO "ATA\n");break; 5246 case 2: printk (KERN_INFO "ATAPI\n");break; 5247 case 3: printk (KERN_INFO "Reserved (Unknown to ide-tape)\n");break; 5248 } 5249 printk (KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); 5250 switch (gcw.device_type) { 5251 case 0: printk (KERN_INFO "Direct-access Device\n");break; 5252 case 1: printk (KERN_INFO "Streaming Tape Device\n");break; 5253 case 2: case 3: case 4: printk (KERN_INFO "Reserved\n");break; 5254 case 5: printk (KERN_INFO "CD-ROM Device\n");break; 5255 case 6: printk (KERN_INFO "Reserved\n"); 5256 case 7: printk (KERN_INFO "Optical memory Device\n");break; 5257 case 0x1f: printk (KERN_INFO "Unknown or no Device type\n");break; 5258 default: printk (KERN_INFO "Reserved\n"); 5259 } 5260 printk (KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); 5261 printk (KERN_INFO "ide-tape: Command Packet DRQ Type: "); 5262 switch (gcw.drq_type) { 5263 case 0: printk (KERN_INFO "Microprocessor DRQ\n");break; 5264 case 1: printk (KERN_INFO "Interrupt DRQ\n");break; 5265 case 2: printk (KERN_INFO "Accelerated DRQ\n");break; 5266 case 3: printk (KERN_INFO "Reserved\n");break; 5267 } 5268 printk (KERN_INFO "ide-tape: Command Packet Size: "); 5269 switch (gcw.packet_size) { 5270 case 0: printk (KERN_INFO "12 bytes\n");break; 5271 case 1: printk (KERN_INFO "16 bytes\n");break; 5272 default: printk (KERN_INFO "Reserved\n");break; 5273 } 5274 printk (KERN_INFO "ide-tape: Model: %.40s\n",id->model); 5275 printk (KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); 5276 printk (KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); 5277 printk (KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); 5278 printk (KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); 5279 printk (KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); 5280 printk (KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); 5281 printk (KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); 5282 printk (KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); 5283 printk (KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); 5284 printk (KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); 5285 printk (KERN_INFO "ide-tape: Single Word DMA supported modes: "); 5286 for (i=0,mask=1;i<8;i++,mask=mask << 1) { 5287 if (id->dma_1word & mask) 5288 printk (KERN_INFO "%d ",i); 5289 if (id->dma_1word & (mask << 8)) 5290 printk (KERN_INFO "(active) "); 5291 } 5292 printk (KERN_INFO "\n"); 5293 printk (KERN_INFO "ide-tape: Multi Word DMA supported modes: "); 5294 for (i=0,mask=1;i<8;i++,mask=mask << 1) { 5295 if (id->dma_mword & mask) 5296 printk (KERN_INFO "%d ",i); 5297 if (id->dma_mword & (mask << 8)) 5298 printk (KERN_INFO "(active) "); 5299 } 5300 printk (KERN_INFO "\n"); 5301 if (id->field_valid & 0x0002) { 5302 printk (KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None"); 5303 printk (KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); 5304 if (id->eide_dma_min == 0) 5305 printk (KERN_INFO "Not supported\n"); 5306 else 5307 printk (KERN_INFO "%d ns\n",id->eide_dma_min); 5308 5309 printk (KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); 5310 if (id->eide_dma_time == 0) 5311 printk (KERN_INFO "Not supported\n"); 5312 else 5313 printk (KERN_INFO "%d ns\n",id->eide_dma_time); 5314 5315 printk (KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); 5316 if (id->eide_pio == 0) 5317 printk (KERN_INFO "Not supported\n"); 5318 else 5319 printk (KERN_INFO "%d ns\n",id->eide_pio); 5320 5321 printk (KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); 5322 if (id->eide_pio_iordy == 0) 5323 printk (KERN_INFO "Not supported\n"); 5324 else 5325 printk (KERN_INFO "%d ns\n",id->eide_pio_iordy); 5326 5327 } else 5328 printk (KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); 5329#endif /* IDETAPE_DEBUG_INFO */ 5330 5331 /* Check that we can support this device */ 5332 5333 if (gcw.protocol !=2 ) 5334 printk (KERN_ERR "ide-tape: Protocol is not ATAPI\n"); 5335 else if (gcw.device_type != 1) 5336 printk (KERN_ERR "ide-tape: Device type is not set to tape\n"); 5337 else if (!gcw.removable) 5338 printk (KERN_ERR "ide-tape: The removable flag is not set\n"); 5339 else if (gcw.packet_size != 0) { 5340 printk (KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); 5341 if (gcw.packet_size == 1) 5342 printk (KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); 5343 } else 5344 return 1; 5345 return 0; 5346} 5347 5348/* 5349 * Notify vendor ID to the OnStream tape drive 5350 */ 5351static void idetape_onstream_set_vendor (ide_drive_t *drive, char *vendor) 5352{ 5353 idetape_pc_t pc; 5354 idetape_mode_parameter_header_t *header; 5355 5356 idetape_create_mode_select_cmd(&pc, sizeof(*header) + 8); 5357 pc.buffer[0] = 3 + 8; /* Mode Data Length */ 5358 pc.buffer[1] = 0; /* Medium Type - ignoring */ 5359 pc.buffer[2] = 0; /* Reserved */ 5360 pc.buffer[3] = 0; /* Block Descriptor Length */ 5361 pc.buffer[4 + 0] = 0x36 | (1 << 7); 5362 pc.buffer[4 + 1] = 6; 5363 pc.buffer[4 + 2] = vendor[0]; 5364 pc.buffer[4 + 3] = vendor[1]; 5365 pc.buffer[4 + 4] = vendor[2]; 5366 pc.buffer[4 + 5] = vendor[3]; 5367 pc.buffer[4 + 6] = 0; 5368 pc.buffer[4 + 7] = 0; 5369 if (idetape_queue_pc_tail (drive, &pc)) 5370 printk (KERN_ERR "ide-tape: Couldn't set vendor name to %s\n", vendor); 5371 5372} 5373 5374/* 5375 * Various unused OnStream commands 5376 */ 5377#if ONSTREAM_DEBUG 5378static void idetape_onstream_set_retries (ide_drive_t *drive, int retries) 5379{ 5380 idetape_pc_t pc; 5381 5382 idetape_create_mode_select_cmd(&pc, sizeof(idetape_mode_parameter_header_t) + 4); 5383 pc.buffer[0] = 3 + 4; 5384 pc.buffer[1] = 0; /* Medium Type - ignoring */ 5385 pc.buffer[2] = 0; /* Reserved */ 5386 pc.buffer[3] = 0; /* Block Descriptor Length */ 5387 pc.buffer[4 + 0] = 0x2f | (1 << 7); 5388 pc.buffer[4 + 1] = 2; 5389 pc.buffer[4 + 2] = 4; 5390 pc.buffer[4 + 3] = retries; 5391 if (idetape_queue_pc_tail (drive, &pc)) 5392 printk (KERN_ERR "ide-tape: Couldn't set retries to %d\n", retries); 5393} 5394#endif 5395 5396/* 5397 * Configure 32.5KB block size. 5398 */ 5399static void idetape_onstream_configure_block_size (ide_drive_t *drive) 5400{ 5401 idetape_pc_t pc; 5402 idetape_mode_parameter_header_t *header; 5403 idetape_block_size_page_t *bs; 5404 5405 /* 5406 * Get the current block size from the block size mode page 5407 */ 5408 idetape_create_mode_sense_cmd (&pc, IDETAPE_BLOCK_SIZE_PAGE); 5409 if (idetape_queue_pc_tail (drive, &pc)) 5410 printk (KERN_ERR "ide-tape: can't get tape block size mode page\n"); 5411 header = (idetape_mode_parameter_header_t *) pc.buffer; 5412 bs = (idetape_block_size_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); 5413 5414#if IDETAPE_DEBUG_INFO 5415 printk(KERN_INFO "ide-tape: 32KB play back: %s\n", bs->play32 ? "Yes" : "No"); 5416 printk(KERN_INFO "ide-tape: 32.5KB play back: %s\n", bs->play32_5 ? "Yes" : "No"); 5417 printk(KERN_INFO "ide-tape: 32KB record: %s\n", bs->record32 ? "Yes" : "No"); 5418 printk(KERN_INFO "ide-tape: 32.5KB record: %s\n", bs->record32_5 ? "Yes" : "No"); 5419#endif /* IDETAPE_DEBUG_INFO */ 5420 5421 /* 5422 * Configure default auto columns mode, 32.5KB block size 5423 */ 5424 bs->one = 1; 5425 bs->play32 = 0; 5426 bs->play32_5 = 1; 5427 bs->record32 = 0; 5428 bs->record32_5 = 1; 5429 idetape_create_mode_select_cmd(&pc, sizeof(*header) + sizeof(*bs)); 5430 if (idetape_queue_pc_tail (drive, &pc)) 5431 printk (KERN_ERR "ide-tape: Couldn't set tape block size mode page\n"); 5432 5433#if ONSTREAM_DEBUG 5434 /* 5435 * In debug mode, we want to see as many errors as possible 5436 * to test the error recovery mechanism. 5437 */ 5438 idetape_onstream_set_retries(drive, 0); 5439#endif 5440} 5441 5442/* 5443 * Use INQUIRY to get the firmware revision 5444 */ 5445static void idetape_get_inquiry_results (ide_drive_t *drive) 5446{ 5447 char *r; 5448 idetape_tape_t *tape = drive->driver_data; 5449 idetape_pc_t pc; 5450 idetape_inquiry_result_t *inquiry; 5451 5452 idetape_create_inquiry_cmd(&pc); 5453 if (idetape_queue_pc_tail (drive, &pc)) { 5454 printk (KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); 5455 return; 5456 } 5457 inquiry = (idetape_inquiry_result_t *) pc.buffer; 5458 memcpy(tape->vendor_id, inquiry->vendor_id, 8); 5459 memcpy(tape->product_id, inquiry->product_id, 16); 5460 memcpy(tape->firmware_revision, inquiry->revision_level, 4); 5461 ide_fixstring(tape->vendor_id, 10, 0); 5462 ide_fixstring(tape->product_id, 18, 0); 5463 ide_fixstring(tape->firmware_revision, 6, 0); 5464 r = tape->firmware_revision; 5465 if (*(r + 1) == '.') 5466 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; 5467 else if (tape->onstream) 5468 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 1) - '0') * 10 + *(r + 2) - '0'; 5469 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision); 5470} 5471 5472/* 5473 * Configure the OnStream ATAPI tape drive for default operation 5474 */ 5475static void idetape_configure_onstream (ide_drive_t *drive) 5476{ 5477 idetape_tape_t *tape = drive->driver_data; 5478 5479 if (tape->firmware_revision_num < 105) { 5480 printk(KERN_INFO "ide-tape: %s: Old OnStream firmware revision detected (%s)\n", tape->name, tape->firmware_revision); 5481 printk(KERN_INFO "ide-tape: %s: An upgrade to version 1.05 or above is recommended\n", tape->name); 5482 } 5483 5484 /* 5485 * Configure 32.5KB (data+aux) block size. 5486 */ 5487 idetape_onstream_configure_block_size(drive); 5488 5489 /* 5490 * Set vendor name to 'LIN3' for "Linux support version 3". 5491 */ 5492 idetape_onstream_set_vendor(drive, "LIN3"); 5493} 5494 5495/* 5496 * idetape_get_mode_sense_parameters asks the tape about its various 5497 * parameters. This may work for other drives to??? 5498 */ 5499static void idetape_onstream_mode_sense_tape_parameter_page(ide_drive_t *drive, int debug) 5500{ 5501 idetape_tape_t *tape = drive->driver_data; 5502 idetape_pc_t pc; 5503 idetape_mode_parameter_header_t *header; 5504 onstream_tape_paramtr_page_t *prm; 5505 5506 idetape_create_mode_sense_cmd (&pc, IDETAPE_PARAMTR_PAGE); 5507 if (idetape_queue_pc_tail (drive, &pc)) { 5508 printk (KERN_ERR "ide-tape: Can't get tape parameters page - probably no tape inserted in onstream drive\n"); 5509 return; 5510 } 5511 header = (idetape_mode_parameter_header_t *) pc.buffer; 5512 prm = (onstream_tape_paramtr_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); 5513 5514 tape->capacity = ntohs(prm->segtrk) * ntohs(prm->trks); 5515 if (debug) { 5516 printk (KERN_INFO "ide-tape: %s <-> %s: Tape length %dMB (%d frames/track, %d tracks = %d blocks, density: %dKbpi)\n", 5517 drive->name, tape->name, tape->capacity/32, ntohs(prm->segtrk), ntohs(prm->trks), tape->capacity, prm->density); 5518 } 5519 5520 return; 5521} 5522 5523/* 5524 * idetape_get_mode_sense_results asks the tape about its various 5525 * parameters. In particular, we will adjust our data transfer buffer 5526 * size to the recommended value as returned by the tape. 5527 */ 5528static void idetape_get_mode_sense_results (ide_drive_t *drive) 5529{ 5530 idetape_tape_t *tape = drive->driver_data; 5531 idetape_pc_t pc; 5532 idetape_mode_parameter_header_t *header; 5533 idetape_capabilities_page_t *capabilities; 5534 5535 idetape_create_mode_sense_cmd (&pc, IDETAPE_CAPABILITIES_PAGE); 5536 if (idetape_queue_pc_tail (drive, &pc)) { 5537 printk (KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); 5538 tape->tape_block_size = 512; tape->capabilities.ctl = 52; 5539 tape->capabilities.speed = 450; tape->capabilities.buffer_size = 6 * 52; 5540 return; 5541 } 5542 header = (idetape_mode_parameter_header_t *) pc.buffer; 5543 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); 5544 5545 capabilities->max_speed = ntohs (capabilities->max_speed); 5546 capabilities->ctl = ntohs (capabilities->ctl); 5547 capabilities->speed = ntohs (capabilities->speed); 5548 capabilities->buffer_size = ntohs (capabilities->buffer_size); 5549 5550 if (!capabilities->speed) { 5551 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); 5552 capabilities->speed = 650; 5553 } 5554 if (!capabilities->max_speed) { 5555 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); 5556 capabilities->max_speed = 650; 5557 } 5558 5559 tape->capabilities = *capabilities; /* Save us a copy */ 5560 if (capabilities->blk512) 5561 tape->tape_block_size = 512; 5562 else if (capabilities->blk1024) 5563 tape->tape_block_size = 1024; 5564 else if (tape->onstream && capabilities->blk32768) 5565 tape->tape_block_size = 32768; 5566 5567#if IDETAPE_DEBUG_INFO 5568 printk (KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); 5569 printk (KERN_INFO "ide-tape: Mode Parameter Header:\n"); 5570 printk (KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); 5571 printk (KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); 5572 printk (KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); 5573 printk (KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); 5574 5575 printk (KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); 5576 printk (KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); 5577 printk (KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); 5578 printk (KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); 5579 printk (KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); 5580 printk (KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); 5581 printk (KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); 5582 printk (KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); 5583 printk (KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); 5584 printk (KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); 5585 printk (KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); 5586 printk (KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); 5587 printk (KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); 5588 printk (KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); 5589 printk (KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); 5590 printk (KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); 5591 printk (KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); 5592 printk (KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); 5593 printk (KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); 5594 printk (KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); 5595#endif /* IDETAPE_DEBUG_INFO */ 5596} 5597 5598/* 5599 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor 5600 * and if it succeeds sets the tape block size with the reported value 5601 */ 5602static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) 5603{ 5604 5605 idetape_tape_t *tape = drive->driver_data; 5606 idetape_pc_t pc; 5607 idetape_mode_parameter_header_t *header; 5608 idetape_parameter_block_descriptor_t *block_descrp; 5609 5610 idetape_create_mode_sense_cmd (&pc, IDETAPE_BLOCK_DESCRIPTOR); 5611 if (idetape_queue_pc_tail (drive, &pc)) { 5612 printk (KERN_ERR "ide-tape: Can't get block descriptor\n"); 5613 if (tape->tape_block_size == 0) { 5614 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); 5615 tape->tape_block_size = 32768; 5616 } 5617 return; 5618 } 5619 header = (idetape_mode_parameter_header_t *) pc.buffer; 5620 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); 5621 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; 5622#if IDETAPE_DEBUG_INFO 5623 printk (KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); 5624#endif /* IDETAPE_DEBUG_INFO */ 5625} 5626static void idetape_add_settings (ide_drive_t *drive) 5627{ 5628 idetape_tape_t *tape = drive->driver_data; 5629 5630/* 5631 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function 5632 */ 5633 ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); 5634 ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); 5635 ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); 5636 ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); 5637 ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); 5638 ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); 5639 ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); 5640 ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); 5641 ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); 5642 ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); 5643 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); 5644 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL); 5645 ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); 5646 ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); 5647 if (tape->onstream) { 5648 ide_add_setting(drive, "cur_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->cur_frames, NULL); 5649 ide_add_setting(drive, "max_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->max_frames, NULL); 5650 ide_add_setting(drive, "insert_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_speed, NULL); 5651 ide_add_setting(drive, "speed_control",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->speed_control, NULL); 5652 ide_add_setting(drive, "tape_still_time",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->tape_still_time, NULL); 5653 ide_add_setting(drive, "max_insert_speed",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->max_insert_speed, NULL); 5654 ide_add_setting(drive, "insert_size", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_size, NULL); 5655 ide_add_setting(drive, "capacity", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->capacity, NULL); 5656 ide_add_setting(drive, "first_frame", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->first_frame_position, NULL); 5657 ide_add_setting(drive, "logical_blk", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->logical_blk_num, NULL); 5658 } 5659} 5660 5661/* 5662 * ide_setup is called to: 5663 * 5664 * 1. Initialize our various state variables. 5665 * 2. Ask the tape for its capabilities. 5666 * 3. Allocate a buffer which will be used for data 5667 * transfer. The buffer size is chosen based on 5668 * the recommendation which we received in step (2). 5669 * 5670 * Note that at this point ide.c already assigned us an irq, so that 5671 * we can queue requests here and wait for their completion. 5672 */ 5673static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) 5674{ 5675 unsigned long t1, tmid, tn, t; 5676 int speed; 5677 struct idetape_id_gcw gcw; 5678 int stage_size; 5679 struct sysinfo si; 5680 5681 memset (tape, 0, sizeof (idetape_tape_t)); 5682 spin_lock_init(&tape->spinlock); 5683 drive->driver_data = tape; 5684 drive->ready_stat = 0; /* An ATAPI device ignores DRDY */ 5685 if (strstr(drive->id->model, "OnStream DI-")) 5686 tape->onstream = 1; 5687 drive->dsc_overlap = 1; 5688#ifdef CONFIG_BLK_DEV_IDEPCI 5689 if (!tape->onstream && HWIF(drive)->pci_dev != NULL) { 5690 /* 5691 * These two ide-pci host adapters appear to need DSC overlap disabled. 5692 * This probably needs further analysis. 5693 */ 5694 if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || 5695 (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { 5696 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); 5697 drive->dsc_overlap = 0; 5698 } 5699 } 5700#endif /* CONFIG_BLK_DEV_IDEPCI */ 5701 tape->drive = drive; 5702 tape->minor = minor; 5703 tape->name[0] = 'h'; tape->name[1] = 't'; tape->name[2] = '0' + minor; 5704 tape->chrdev_direction = idetape_direction_none; 5705 tape->pc = tape->pc_stack; 5706 tape->max_insert_speed = 10000; 5707 tape->speed_control = 1; 5708 *((unsigned short *) &gcw) = drive->id->config; 5709 if (gcw.drq_type == 1) 5710 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); 5711 5712 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; 5713 5714 idetape_get_inquiry_results(drive); 5715 idetape_get_mode_sense_results(drive); 5716 idetape_get_blocksize_from_block_descriptor(drive); 5717 if (tape->onstream) { 5718 idetape_onstream_mode_sense_tape_parameter_page(drive, 1); 5719 idetape_configure_onstream(drive); 5720 } 5721 tape->user_bs_factor = 1; 5722 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 5723 while (tape->stage_size > 0xffff) { 5724 printk (KERN_NOTICE "ide-tape: decreasing stage size\n"); 5725 tape->capabilities.ctl /= 2; 5726 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 5727 } 5728 stage_size = tape->stage_size; 5729 if (tape->onstream) 5730 stage_size = 32768 + 512; 5731 tape->pages_per_stage = stage_size / PAGE_SIZE; 5732 if (stage_size % PAGE_SIZE) { 5733 tape->pages_per_stage++; 5734 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; 5735 } 5736 5737 /* 5738 * Select the "best" DSC read/write polling frequency 5739 * and pipeline size. 5740 */ 5741 speed = IDE_MAX (tape->capabilities.speed, tape->capabilities.max_speed); 5742 5743 tape->max_stages = speed * 1000 * 10 / tape->stage_size; 5744 5745 /* 5746 * Limit memory use for pipeline to 10% of physical memory 5747 */ 5748 si_meminfo(&si); 5749 if ( tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) 5750 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); 5751 tape->min_pipeline = tape->max_stages; 5752 tape->max_pipeline = tape->max_stages * 2; 5753 5754 t1 = (tape->stage_size * HZ) / (speed * 1000); 5755 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); 5756 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); 5757 5758 if (tape->max_stages) 5759 t = tn; 5760 else 5761 t = t1; 5762 5763 /* 5764 * Ensure that the number we got makes sense; limit 5765 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 5766 */ 5767 tape->best_dsc_rw_frequency = IDE_MAX (IDE_MIN (t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); 5768 printk (KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, %dkB pipeline, %lums tDSC%s\n", 5769 drive->name, tape->name, tape->capabilities.speed, (tape->capabilities.buffer_size * 512) / tape->stage_size, 5770 tape->stage_size / 1024, tape->max_stages * tape->stage_size / 1024, 5771 tape->best_dsc_rw_frequency * 1000 / HZ, drive->using_dma ? ", DMA":""); 5772 5773 idetape_add_settings(drive); 5774} 5775 5776static int idetape_cleanup (ide_drive_t *drive) 5777{ 5778 idetape_tape_t *tape = drive->driver_data; 5779 int minor = tape->minor; 5780 unsigned long flags; 5781 5782 save_flags (flags); /* all CPUs (overkill?) */ 5783 cli(); /* all CPUs (overkill?) */ 5784 if (test_bit (IDETAPE_BUSY, &tape->flags) || tape->first_stage != NULL || tape->merge_stage_size || drive->usage) { 5785 restore_flags(flags); /* all CPUs (overkill?) */ 5786 return 1; 5787 } 5788 idetape_chrdevs[minor].drive = NULL; 5789 restore_flags (flags); /* all CPUs (overkill?) */ 5790 DRIVER(drive)->busy = 0; 5791 (void) ide_unregister_subdriver (drive); 5792 drive->driver_data = NULL; 5793 devfs_unregister (tape->de_r); 5794 devfs_unregister (tape->de_n); 5795 kfree (tape); 5796 for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) 5797 if (idetape_chrdevs[minor].drive != NULL) 5798 return 0; 5799 devfs_unregister_chrdev (IDETAPE_MAJOR, "ht"); 5800 idetape_chrdev_present = 0; 5801 return 0; 5802} 5803 5804#ifdef CONFIG_PROC_FS 5805 5806static int proc_idetape_read_name 5807 (char *page, char **start, off_t off, int count, int *eof, void *data) 5808{ 5809 ide_drive_t *drive = (ide_drive_t *) data; 5810 idetape_tape_t *tape = drive->driver_data; 5811 char *out = page; 5812 int len; 5813 5814 len = sprintf(out, "%s\n", tape->name); 5815 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 5816} 5817 5818static ide_proc_entry_t idetape_proc[] = { 5819 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 5820 { NULL, 0, NULL, NULL } 5821}; 5822 5823#else 5824 5825#define idetape_proc NULL 5826 5827#endif 5828 5829int idetape_reinit(ide_drive_t *drive); 5830 5831/* 5832 * IDE subdriver functions, registered with ide.c 5833 */ 5834static ide_driver_t idetape_driver = { 5835 name: "ide-tape", 5836 version: IDETAPE_VERSION, 5837 media: ide_tape, 5838 busy: 1, 5839 supports_dma: 1, 5840 supports_dsc_overlap: 1, 5841 cleanup: idetape_cleanup, 5842 standby: NULL, 5843 flushcache: NULL, 5844 do_request: idetape_do_request, 5845 end_request: idetape_end_request, 5846 ioctl: idetape_blkdev_ioctl, 5847 open: idetape_blkdev_open, 5848 release: idetape_blkdev_release, 5849 media_change: NULL, 5850 revalidate: NULL, 5851 pre_reset: idetape_pre_reset, 5852 capacity: NULL, 5853 proc: idetape_proc, 5854 reinit: idetape_reinit, 5855 ata_prebuilder: NULL, 5856 atapi_prebuilder: NULL, 5857}; 5858 5859int idetape_init (void); 5860static ide_module_t idetape_module = { 5861 IDE_DRIVER_MODULE, 5862 idetape_init, 5863 &idetape_driver, 5864 NULL 5865}; 5866 5867/* 5868 * Our character device supporting functions, passed to register_chrdev. 5869 */ 5870static struct file_operations idetape_fops = { 5871 owner: THIS_MODULE, 5872 read: idetape_chrdev_read, 5873 write: idetape_chrdev_write, 5874 ioctl: idetape_chrdev_ioctl, 5875 open: idetape_chrdev_open, 5876 release: idetape_chrdev_release, 5877}; 5878 5879int idetape_reinit (ide_drive_t *drive) 5880{ 5881 return 1; 5882} 5883 5884MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 5885MODULE_LICENSE("GPL"); 5886 5887static void __exit idetape_exit (void) 5888{ 5889 ide_drive_t *drive; 5890 int minor; 5891 5892 for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) { 5893 drive = idetape_chrdevs[minor].drive; 5894 if (drive != NULL && idetape_cleanup (drive)) 5895 printk (KERN_ERR "ide-tape: %s: cleanup_module() called while still busy\n", drive->name); 5896 } 5897 ide_unregister_module(&idetape_module); 5898} 5899 5900/* 5901 * idetape_init will register the driver for each tape. 5902 */ 5903int idetape_init (void) 5904{ 5905 ide_drive_t *drive; 5906 idetape_tape_t *tape; 5907 int minor, failed = 0, supported = 0; 5908/* DRIVER(drive)->busy++; */ 5909 MOD_INC_USE_COUNT; 5910#if ONSTREAM_DEBUG 5911 printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_init\n"); 5912#endif 5913 if (!idetape_chrdev_present) 5914 for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++ ) 5915 idetape_chrdevs[minor].drive = NULL; 5916 5917 if ((drive = ide_scan_devices (ide_tape, idetape_driver.name, NULL, failed++)) == NULL) { 5918 ide_register_module (&idetape_module); 5919 MOD_DEC_USE_COUNT; 5920#if ONSTREAM_DEBUG 5921 printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); 5922#endif 5923 return 0; 5924 } 5925 if (!idetape_chrdev_present && 5926 devfs_register_chrdev (IDETAPE_MAJOR, "ht", &idetape_fops)) { 5927 printk (KERN_ERR "ide-tape: Failed to register character device interface\n"); 5928 MOD_DEC_USE_COUNT; 5929#if ONSTREAM_DEBUG 5930 printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); 5931#endif 5932 return -EBUSY; 5933 } 5934 do { 5935 if (!idetape_identify_device (drive, drive->id)) { 5936 printk (KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); 5937 continue; 5938 } 5939 if (drive->scsi) { 5940 if (strstr(drive->id->model, "OnStream DI-")) { 5941 printk("ide-tape: ide-scsi emulation is not supported for %s.\n", drive->id->model); 5942 } else { 5943 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); 5944 continue; 5945 } 5946 } 5947 tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL); 5948 if (tape == NULL) { 5949 printk (KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); 5950 continue; 5951 } 5952 if (ide_register_subdriver (drive, &idetape_driver, IDE_SUBDRIVER_VERSION)) { 5953 printk (KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name); 5954 kfree (tape); 5955 continue; 5956 } 5957 for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++); 5958 idetape_setup (drive, tape, minor); 5959 idetape_chrdevs[minor].drive = drive; 5960 tape->de_r = 5961 devfs_register (drive->de, "mt", DEVFS_FL_DEFAULT, 5962 HWIF(drive)->major, minor, 5963 S_IFCHR | S_IRUGO | S_IWUGO, 5964 &idetape_fops, NULL); 5965 tape->de_n = 5966 devfs_register (drive->de, "mtn", DEVFS_FL_DEFAULT, 5967 HWIF(drive)->major, minor + 128, 5968 S_IFCHR | S_IRUGO | S_IWUGO, 5969 &idetape_fops, NULL); 5970 devfs_register_tape (tape->de_r); 5971 supported++; failed--; 5972 } while ((drive = ide_scan_devices (ide_tape, idetape_driver.name, NULL, failed++)) != NULL); 5973 if (!idetape_chrdev_present && !supported) { 5974 devfs_unregister_chrdev (IDETAPE_MAJOR, "ht"); 5975 } else 5976 idetape_chrdev_present = 1; 5977 ide_register_module (&idetape_module); 5978 MOD_DEC_USE_COUNT; 5979#if ONSTREAM_DEBUG 5980 printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); 5981#endif 5982 return 0; 5983} 5984 5985module_init(idetape_init); 5986module_exit(idetape_exit); 5987