ide-tape.c revision c7ea8a1b36487cb3002c2a626261c99a9f30790c
1/* 2 * IDE ATAPI streaming tape driver. 3 * 4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> 5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz 6 * 7 * This driver was constructed as a student project in the software laboratory 8 * of the faculty of electrical engineering in the Technion - Israel's 9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. 10 * 11 * It is hereby placed under the terms of the GNU general public license. 12 * (See linux/COPYING). 13 * 14 * For a historical changelog see 15 * Documentation/ide/ChangeLog.ide-tape.1995-2002 16 */ 17 18#define IDETAPE_VERSION "1.19" 19 20#include <linux/module.h> 21#include <linux/types.h> 22#include <linux/string.h> 23#include <linux/kernel.h> 24#include <linux/delay.h> 25#include <linux/timer.h> 26#include <linux/mm.h> 27#include <linux/interrupt.h> 28#include <linux/jiffies.h> 29#include <linux/major.h> 30#include <linux/errno.h> 31#include <linux/genhd.h> 32#include <linux/slab.h> 33#include <linux/pci.h> 34#include <linux/ide.h> 35#include <linux/smp_lock.h> 36#include <linux/completion.h> 37#include <linux/bitops.h> 38#include <linux/mutex.h> 39 40#include <asm/byteorder.h> 41#include <asm/irq.h> 42#include <asm/uaccess.h> 43#include <asm/io.h> 44#include <asm/unaligned.h> 45 46/* 47 * partition 48 */ 49typedef struct os_partition_s { 50 __u8 partition_num; 51 __u8 par_desc_ver; 52 __u16 wrt_pass_cntr; 53 __u32 first_frame_addr; 54 __u32 last_frame_addr; 55 __u32 eod_frame_addr; 56} os_partition_t; 57 58/* 59 * DAT entry 60 */ 61typedef struct os_dat_entry_s { 62 __u32 blk_sz; 63 __u16 blk_cnt; 64 __u8 flags; 65 __u8 reserved; 66} os_dat_entry_t; 67 68/* 69 * DAT 70 */ 71#define OS_DAT_FLAGS_DATA (0xc) 72#define OS_DAT_FLAGS_MARK (0x1) 73 74typedef struct os_dat_s { 75 __u8 dat_sz; 76 __u8 reserved1; 77 __u8 entry_cnt; 78 __u8 reserved3; 79 os_dat_entry_t dat_list[16]; 80} os_dat_t; 81 82#include <linux/mtio.h> 83 84/**************************** Tunable parameters *****************************/ 85 86 87/* 88 * Pipelined mode parameters. 89 * 90 * We try to use the minimum number of stages which is enough to 91 * keep the tape constantly streaming. To accomplish that, we implement 92 * a feedback loop around the maximum number of stages: 93 * 94 * We start from MIN maximum stages (we will not even use MIN stages 95 * if we don't need them), increment it by RATE*(MAX-MIN) 96 * whenever we sense that the pipeline is empty, until we reach 97 * the optimum value or until we reach MAX. 98 * 99 * Setting the following parameter to 0 is illegal: the pipelined mode 100 * cannot be disabled (calculate_speeds() divides by tape->max_stages.) 101 */ 102#define IDETAPE_MIN_PIPELINE_STAGES 1 103#define IDETAPE_MAX_PIPELINE_STAGES 400 104#define IDETAPE_INCREASE_STAGES_RATE 20 105 106/* 107 * The following are used to debug the driver: 108 * 109 * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. 110 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. 111 * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in 112 * some places. 113 * 114 * Setting them to 0 will restore normal operation mode: 115 * 116 * 1. Disable logging normal successful operations. 117 * 2. Disable self-sanity checks. 118 * 3. Errors will still be logged, of course. 119 * 120 * All the #if DEBUG code will be removed some day, when the driver 121 * is verified to be stable enough. This will make it much more 122 * esthetic. 123 */ 124#define IDETAPE_DEBUG_INFO 0 125#define IDETAPE_DEBUG_LOG 0 126#define IDETAPE_DEBUG_BUGS 1 127 128/* 129 * After each failed packet command we issue a request sense command 130 * and retry the packet command IDETAPE_MAX_PC_RETRIES times. 131 * 132 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 133 */ 134#define IDETAPE_MAX_PC_RETRIES 3 135 136/* 137 * With each packet command, we allocate a buffer of 138 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet 139 * commands (Not for READ/WRITE commands). 140 */ 141#define IDETAPE_PC_BUFFER_SIZE 256 142 143/* 144 * In various places in the driver, we need to allocate storage 145 * for packet commands and requests, which will remain valid while 146 * we leave the driver to wait for an interrupt or a timeout event. 147 */ 148#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) 149 150/* 151 * Some drives (for example, Seagate STT3401A Travan) require a very long 152 * timeout, because they don't return an interrupt or clear their busy bit 153 * until after the command completes (even retension commands). 154 */ 155#define IDETAPE_WAIT_CMD (900*HZ) 156 157/* 158 * The following parameter is used to select the point in the internal 159 * tape fifo in which we will start to refill the buffer. Decreasing 160 * the following parameter will improve the system's latency and 161 * interactive response, while using a high value might improve system 162 * throughput. 163 */ 164#define IDETAPE_FIFO_THRESHOLD 2 165 166/* 167 * DSC polling parameters. 168 * 169 * Polling for DSC (a single bit in the status register) is a very 170 * important function in ide-tape. There are two cases in which we 171 * poll for DSC: 172 * 173 * 1. Before a read/write packet command, to ensure that we 174 * can transfer data from/to the tape's data buffers, without 175 * causing an actual media access. In case the tape is not 176 * ready yet, we take out our request from the device 177 * request queue, so that ide.c will service requests from 178 * the other device on the same interface meanwhile. 179 * 180 * 2. After the successful initialization of a "media access 181 * packet command", which is a command which can take a long 182 * time to complete (it can be several seconds or even an hour). 183 * 184 * Again, we postpone our request in the middle to free the bus 185 * for the other device. The polling frequency here should be 186 * lower than the read/write frequency since those media access 187 * commands are slow. We start from a "fast" frequency - 188 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC 189 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a 190 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). 191 * 192 * We also set a timeout for the timer, in case something goes wrong. 193 * The timeout should be longer then the maximum execution time of a 194 * tape operation. 195 */ 196 197/* 198 * DSC timings. 199 */ 200#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 201#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 202#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 203#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 204#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 205#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 206#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 207 208/*************************** End of tunable parameters ***********************/ 209 210/* 211 * Read/Write error simulation 212 */ 213#define SIMULATE_ERRORS 0 214 215/* 216 * For general magnetic tape device compatibility. 217 */ 218typedef enum { 219 idetape_direction_none, 220 idetape_direction_read, 221 idetape_direction_write 222} idetape_chrdev_direction_t; 223 224struct idetape_bh { 225 u32 b_size; 226 atomic_t b_count; 227 struct idetape_bh *b_reqnext; 228 char *b_data; 229}; 230 231/* 232 * Our view of a packet command. 233 */ 234typedef struct idetape_packet_command_s { 235 u8 c[12]; /* Actual packet bytes */ 236 int retries; /* On each retry, we increment retries */ 237 int error; /* Error code */ 238 int request_transfer; /* Bytes to transfer */ 239 int actually_transferred; /* Bytes actually transferred */ 240 int buffer_size; /* Size of our data buffer */ 241 struct idetape_bh *bh; 242 char *b_data; 243 int b_count; 244 u8 *buffer; /* Data buffer */ 245 u8 *current_position; /* Pointer into the above buffer */ 246 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ 247 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ 248 unsigned long flags; /* Status/Action bit flags: long for set_bit */ 249} idetape_pc_t; 250 251/* 252 * Packet command flag bits. 253 */ 254/* Set when an error is considered normal - We won't retry */ 255#define PC_ABORT 0 256/* 1 When polling for DSC on a media access command */ 257#define PC_WAIT_FOR_DSC 1 258/* 1 when we prefer to use DMA if possible */ 259#define PC_DMA_RECOMMENDED 2 260/* 1 while DMA in progress */ 261#define PC_DMA_IN_PROGRESS 3 262/* 1 when encountered problem during DMA */ 263#define PC_DMA_ERROR 4 264/* Data direction */ 265#define PC_WRITING 5 266 267/* 268 * Capabilities and Mechanical Status Page 269 */ 270typedef struct { 271 unsigned page_code :6; /* Page code - Should be 0x2a */ 272 __u8 reserved0_6 :1; 273 __u8 ps :1; /* parameters saveable */ 274 __u8 page_length; /* Page Length - Should be 0x12 */ 275 __u8 reserved2, reserved3; 276 unsigned ro :1; /* Read Only Mode */ 277 unsigned reserved4_1234 :4; 278 unsigned sprev :1; /* Supports SPACE in the reverse direction */ 279 unsigned reserved4_67 :2; 280 unsigned reserved5_012 :3; 281 unsigned efmt :1; /* Supports ERASE command initiated formatting */ 282 unsigned reserved5_4 :1; 283 unsigned qfa :1; /* Supports the QFA two partition formats */ 284 unsigned reserved5_67 :2; 285 unsigned lock :1; /* Supports locking the volume */ 286 unsigned locked :1; /* The volume is locked */ 287 unsigned prevent :1; /* The device defaults in the prevent state after power up */ 288 unsigned eject :1; /* The device can eject the volume */ 289 __u8 disconnect :1; /* The device can break request > ctl */ 290 __u8 reserved6_5 :1; 291 unsigned ecc :1; /* Supports error correction */ 292 unsigned cmprs :1; /* Supports data compression */ 293 unsigned reserved7_0 :1; 294 unsigned blk512 :1; /* Supports 512 bytes block size */ 295 unsigned blk1024 :1; /* Supports 1024 bytes block size */ 296 unsigned reserved7_3_6 :4; 297 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ 298 /* transfers for slow buffer memory ??? */ 299 /* Also 32768 block size in some cases */ 300 __u16 max_speed; /* Maximum speed supported in KBps */ 301 __u8 reserved10, reserved11; 302 __u16 ctl; /* Continuous Transfer Limit in blocks */ 303 __u16 speed; /* Current Speed, in KBps */ 304 __u16 buffer_size; /* Buffer Size, in 512 bytes */ 305 __u8 reserved18, reserved19; 306} idetape_capabilities_page_t; 307 308/* 309 * Block Size Page 310 */ 311typedef struct { 312 unsigned page_code :6; /* Page code - Should be 0x30 */ 313 unsigned reserved1_6 :1; 314 unsigned ps :1; 315 __u8 page_length; /* Page Length - Should be 2 */ 316 __u8 reserved2; 317 unsigned play32 :1; 318 unsigned play32_5 :1; 319 unsigned reserved2_23 :2; 320 unsigned record32 :1; 321 unsigned record32_5 :1; 322 unsigned reserved2_6 :1; 323 unsigned one :1; 324} idetape_block_size_page_t; 325 326/* 327 * A pipeline stage. 328 */ 329typedef struct idetape_stage_s { 330 struct request rq; /* The corresponding request */ 331 struct idetape_bh *bh; /* The data buffers */ 332 struct idetape_stage_s *next; /* Pointer to the next stage */ 333} idetape_stage_t; 334 335/* 336 * REQUEST SENSE packet command result - Data Format. 337 */ 338typedef struct { 339 unsigned error_code :7; /* Current of deferred errors */ 340 unsigned valid :1; /* The information field conforms to QIC-157C */ 341 __u8 reserved1 :8; /* Segment Number - Reserved */ 342 unsigned sense_key :4; /* Sense Key */ 343 unsigned reserved2_4 :1; /* Reserved */ 344 unsigned ili :1; /* Incorrect Length Indicator */ 345 unsigned eom :1; /* End Of Medium */ 346 unsigned filemark :1; /* Filemark */ 347 __u32 information __attribute__ ((packed)); 348 __u8 asl; /* Additional sense length (n-7) */ 349 __u32 command_specific; /* Additional command specific information */ 350 __u8 asc; /* Additional Sense Code */ 351 __u8 ascq; /* Additional Sense Code Qualifier */ 352 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ 353 unsigned sk_specific1 :7; /* Sense Key Specific */ 354 unsigned sksv :1; /* Sense Key Specific information is valid */ 355 __u8 sk_specific2; /* Sense Key Specific */ 356 __u8 sk_specific3; /* Sense Key Specific */ 357 __u8 pad[2]; /* Padding to 20 bytes */ 358} idetape_request_sense_result_t; 359 360 361/* 362 * Most of our global data which we need to save even as we leave the 363 * driver due to an interrupt or a timer event is stored in a variable 364 * of type idetape_tape_t, defined below. 365 */ 366typedef struct ide_tape_obj { 367 ide_drive_t *drive; 368 ide_driver_t *driver; 369 struct gendisk *disk; 370 struct kref kref; 371 372 /* 373 * Since a typical character device operation requires more 374 * than one packet command, we provide here enough memory 375 * for the maximum of interconnected packet commands. 376 * The packet commands are stored in the circular array pc_stack. 377 * pc_stack_index points to the last used entry, and warps around 378 * to the start when we get to the last array entry. 379 * 380 * pc points to the current processed packet command. 381 * 382 * failed_pc points to the last failed packet command, or contains 383 * NULL if we do not need to retry any packet command. This is 384 * required since an additional packet command is needed before the 385 * retry, to get detailed information on what went wrong. 386 */ 387 /* Current packet command */ 388 idetape_pc_t *pc; 389 /* Last failed packet command */ 390 idetape_pc_t *failed_pc; 391 /* Packet command stack */ 392 idetape_pc_t pc_stack[IDETAPE_PC_STACK]; 393 /* Next free packet command storage space */ 394 int pc_stack_index; 395 struct request rq_stack[IDETAPE_PC_STACK]; 396 /* We implement a circular array */ 397 int rq_stack_index; 398 399 /* 400 * DSC polling variables. 401 * 402 * While polling for DSC we use postponed_rq to postpone the 403 * current request so that ide.c will be able to service 404 * pending requests on the other device. Note that at most 405 * we will have only one DSC (usually data transfer) request 406 * in the device request queue. Additional requests can be 407 * queued in our internal pipeline, but they will be visible 408 * to ide.c only one at a time. 409 */ 410 struct request *postponed_rq; 411 /* The time in which we started polling for DSC */ 412 unsigned long dsc_polling_start; 413 /* Timer used to poll for dsc */ 414 struct timer_list dsc_timer; 415 /* Read/Write dsc polling frequency */ 416 unsigned long best_dsc_rw_frequency; 417 /* The current polling frequency */ 418 unsigned long dsc_polling_frequency; 419 /* Maximum waiting time */ 420 unsigned long dsc_timeout; 421 422 /* 423 * Read position information 424 */ 425 u8 partition; 426 /* Current block */ 427 unsigned int first_frame_position; 428 unsigned int last_frame_position; 429 unsigned int blocks_in_buffer; 430 431 /* 432 * Last error information 433 */ 434 u8 sense_key, asc, ascq; 435 436 /* 437 * Character device operation 438 */ 439 unsigned int minor; 440 /* device name */ 441 char name[4]; 442 /* Current character device data transfer direction */ 443 idetape_chrdev_direction_t chrdev_direction; 444 445 /* 446 * Device information 447 */ 448 /* Usually 512 or 1024 bytes */ 449 unsigned short tape_block_size; 450 int user_bs_factor; 451 /* Copy of the tape's Capabilities and Mechanical Page */ 452 idetape_capabilities_page_t capabilities; 453 454 /* 455 * Active data transfer request parameters. 456 * 457 * At most, there is only one ide-tape originated data transfer 458 * request in the device request queue. This allows ide.c to 459 * easily service requests from the other device when we 460 * postpone our active request. In the pipelined operation 461 * mode, we use our internal pipeline structure to hold 462 * more data requests. 463 * 464 * The data buffer size is chosen based on the tape's 465 * recommendation. 466 */ 467 /* Pointer to the request which is waiting in the device request queue */ 468 struct request *active_data_request; 469 /* Data buffer size (chosen based on the tape's recommendation */ 470 int stage_size; 471 idetape_stage_t *merge_stage; 472 int merge_stage_size; 473 struct idetape_bh *bh; 474 char *b_data; 475 int b_count; 476 477 /* 478 * Pipeline parameters. 479 * 480 * To accomplish non-pipelined mode, we simply set the following 481 * variables to zero (or NULL, where appropriate). 482 */ 483 /* Number of currently used stages */ 484 int nr_stages; 485 /* Number of pending stages */ 486 int nr_pending_stages; 487 /* We will not allocate more than this number of stages */ 488 int max_stages, min_pipeline, max_pipeline; 489 /* The first stage which will be removed from the pipeline */ 490 idetape_stage_t *first_stage; 491 /* The currently active stage */ 492 idetape_stage_t *active_stage; 493 /* Will be serviced after the currently active request */ 494 idetape_stage_t *next_stage; 495 /* New requests will be added to the pipeline here */ 496 idetape_stage_t *last_stage; 497 /* Optional free stage which we can use */ 498 idetape_stage_t *cache_stage; 499 int pages_per_stage; 500 /* Wasted space in each stage */ 501 int excess_bh_size; 502 503 /* Status/Action flags: long for set_bit */ 504 unsigned long flags; 505 /* protects the ide-tape queue */ 506 spinlock_t spinlock; 507 508 /* 509 * Measures average tape speed 510 */ 511 unsigned long avg_time; 512 int avg_size; 513 int avg_speed; 514 515 /* last sense information */ 516 idetape_request_sense_result_t sense; 517 518 char vendor_id[10]; 519 char product_id[18]; 520 char firmware_revision[6]; 521 int firmware_revision_num; 522 523 /* the door is currently locked */ 524 int door_locked; 525 /* the tape hardware is write protected */ 526 char drv_write_prot; 527 /* the tape is write protected (hardware or opened as read-only) */ 528 char write_prot; 529 530 /* 531 * Limit the number of times a request can 532 * be postponed, to avoid an infinite postpone 533 * deadlock. 534 */ 535 /* request postpone count limit */ 536 int postpone_cnt; 537 538 /* 539 * Measures number of frames: 540 * 541 * 1. written/read to/from the driver pipeline (pipeline_head). 542 * 2. written/read to/from the tape buffers (idetape_bh). 543 * 3. written/read by the tape to/from the media (tape_head). 544 */ 545 int pipeline_head; 546 int buffer_head; 547 int tape_head; 548 int last_tape_head; 549 550 /* 551 * Speed control at the tape buffers input/output 552 */ 553 unsigned long insert_time; 554 int insert_size; 555 int insert_speed; 556 int max_insert_speed; 557 int measure_insert_time; 558 559 /* 560 * Measure tape still time, in milliseconds 561 */ 562 unsigned long tape_still_time_begin; 563 int tape_still_time; 564 565 /* 566 * Speed regulation negative feedback loop 567 */ 568 int speed_control; 569 int pipeline_head_speed; 570 int controlled_pipeline_head_speed; 571 int uncontrolled_pipeline_head_speed; 572 int controlled_last_pipeline_head; 573 int uncontrolled_last_pipeline_head; 574 unsigned long uncontrolled_pipeline_head_time; 575 unsigned long controlled_pipeline_head_time; 576 int controlled_previous_pipeline_head; 577 int uncontrolled_previous_pipeline_head; 578 unsigned long controlled_previous_head_time; 579 unsigned long uncontrolled_previous_head_time; 580 int restart_speed_control_req; 581 582 /* 583 * Debug_level determines amount of debugging output; 584 * can be changed using /proc/ide/hdx/settings 585 * 0 : almost no debugging output 586 * 1 : 0+output errors only 587 * 2 : 1+output all sensekey/asc 588 * 3 : 2+follow all chrdev related procedures 589 * 4 : 3+follow all procedures 590 * 5 : 4+include pc_stack rq_stack info 591 * 6 : 5+USE_COUNT updates 592 */ 593 int debug_level; 594} idetape_tape_t; 595 596static DEFINE_MUTEX(idetape_ref_mutex); 597 598static struct class *idetape_sysfs_class; 599 600#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) 601 602#define ide_tape_g(disk) \ 603 container_of((disk)->private_data, struct ide_tape_obj, driver) 604 605static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 606{ 607 struct ide_tape_obj *tape = NULL; 608 609 mutex_lock(&idetape_ref_mutex); 610 tape = ide_tape_g(disk); 611 if (tape) 612 kref_get(&tape->kref); 613 mutex_unlock(&idetape_ref_mutex); 614 return tape; 615} 616 617static void ide_tape_release(struct kref *); 618 619static void ide_tape_put(struct ide_tape_obj *tape) 620{ 621 mutex_lock(&idetape_ref_mutex); 622 kref_put(&tape->kref, ide_tape_release); 623 mutex_unlock(&idetape_ref_mutex); 624} 625 626/* 627 * Tape door status 628 */ 629#define DOOR_UNLOCKED 0 630#define DOOR_LOCKED 1 631#define DOOR_EXPLICITLY_LOCKED 2 632 633/* 634 * Tape flag bits values. 635 */ 636#define IDETAPE_IGNORE_DSC 0 637#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ 638#define IDETAPE_BUSY 2 /* Device already opened */ 639#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ 640#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ 641#define IDETAPE_FILEMARK 5 /* Currently on a filemark */ 642#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ 643#define IDETAPE_READ_ERROR 7 644#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ 645/* 0 = no tape is loaded, so we don't rewind after ejecting */ 646#define IDETAPE_MEDIUM_PRESENT 9 647 648/* 649 * Supported ATAPI tape drives packet commands 650 */ 651#define IDETAPE_TEST_UNIT_READY_CMD 0x00 652#define IDETAPE_REWIND_CMD 0x01 653#define IDETAPE_REQUEST_SENSE_CMD 0x03 654#define IDETAPE_READ_CMD 0x08 655#define IDETAPE_WRITE_CMD 0x0a 656#define IDETAPE_WRITE_FILEMARK_CMD 0x10 657#define IDETAPE_SPACE_CMD 0x11 658#define IDETAPE_INQUIRY_CMD 0x12 659#define IDETAPE_ERASE_CMD 0x19 660#define IDETAPE_MODE_SENSE_CMD 0x1a 661#define IDETAPE_MODE_SELECT_CMD 0x15 662#define IDETAPE_LOAD_UNLOAD_CMD 0x1b 663#define IDETAPE_PREVENT_CMD 0x1e 664#define IDETAPE_LOCATE_CMD 0x2b 665#define IDETAPE_READ_POSITION_CMD 0x34 666#define IDETAPE_READ_BUFFER_CMD 0x3c 667#define IDETAPE_SET_SPEED_CMD 0xbb 668 669/* 670 * Some defines for the READ BUFFER command 671 */ 672#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 673 674/* 675 * Some defines for the SPACE command 676 */ 677#define IDETAPE_SPACE_OVER_FILEMARK 1 678#define IDETAPE_SPACE_TO_EOD 3 679 680/* 681 * Some defines for the LOAD UNLOAD command 682 */ 683#define IDETAPE_LU_LOAD_MASK 1 684#define IDETAPE_LU_RETENSION_MASK 2 685#define IDETAPE_LU_EOT_MASK 4 686 687/* 688 * Special requests for our block device strategy routine. 689 * 690 * In order to service a character device command, we add special 691 * requests to the tail of our block device request queue and wait 692 * for their completion. 693 */ 694 695enum { 696 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ 697 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ 698 REQ_IDETAPE_READ = (1 << 2), 699 REQ_IDETAPE_WRITE = (1 << 3), 700 REQ_IDETAPE_READ_BUFFER = (1 << 4), 701}; 702 703/* 704 * Error codes which are returned in rq->errors to the higher part 705 * of the driver. 706 */ 707#define IDETAPE_ERROR_GENERAL 101 708#define IDETAPE_ERROR_FILEMARK 102 709#define IDETAPE_ERROR_EOD 103 710 711/* 712 * The following is used to format the general configuration word of 713 * the ATAPI IDENTIFY DEVICE command. 714 */ 715struct idetape_id_gcw { 716 unsigned packet_size :2; /* Packet Size */ 717 unsigned reserved234 :3; /* Reserved */ 718 unsigned drq_type :2; /* Command packet DRQ type */ 719 unsigned removable :1; /* Removable media */ 720 unsigned device_type :5; /* Device type */ 721 unsigned reserved13 :1; /* Reserved */ 722 unsigned protocol :2; /* Protocol type */ 723}; 724 725/* 726 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) 727 */ 728typedef struct { 729 unsigned device_type :5; /* Peripheral Device Type */ 730 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ 731 unsigned reserved1_6t0 :7; /* Reserved */ 732 unsigned rmb :1; /* Removable Medium Bit */ 733 unsigned ansi_version :3; /* ANSI Version */ 734 unsigned ecma_version :3; /* ECMA Version */ 735 unsigned iso_version :2; /* ISO Version */ 736 unsigned response_format :4; /* Response Data Format */ 737 unsigned reserved3_45 :2; /* Reserved */ 738 unsigned reserved3_6 :1; /* TrmIOP - Reserved */ 739 unsigned reserved3_7 :1; /* AENC - Reserved */ 740 __u8 additional_length; /* Additional Length (total_length-4) */ 741 __u8 rsv5, rsv6, rsv7; /* Reserved */ 742 __u8 vendor_id[8]; /* Vendor Identification */ 743 __u8 product_id[16]; /* Product Identification */ 744 __u8 revision_level[4]; /* Revision Level */ 745 __u8 vendor_specific[20]; /* Vendor Specific - Optional */ 746 __u8 reserved56t95[40]; /* Reserved - Optional */ 747 /* Additional information may be returned */ 748} idetape_inquiry_result_t; 749 750/* 751 * READ POSITION packet command - Data Format (From Table 6-57) 752 */ 753typedef struct { 754 unsigned reserved0_10 :2; /* Reserved */ 755 unsigned bpu :1; /* Block Position Unknown */ 756 unsigned reserved0_543 :3; /* Reserved */ 757 unsigned eop :1; /* End Of Partition */ 758 unsigned bop :1; /* Beginning Of Partition */ 759 u8 partition; /* Partition Number */ 760 u8 reserved2, reserved3; /* Reserved */ 761 u32 first_block; /* First Block Location */ 762 u32 last_block; /* Last Block Location (Optional) */ 763 u8 reserved12; /* Reserved */ 764 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ 765 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ 766} idetape_read_position_result_t; 767 768/* 769 * Follows structures which are related to the SELECT SENSE / MODE SENSE 770 * packet commands. Those packet commands are still not supported 771 * by ide-tape. 772 */ 773#define IDETAPE_BLOCK_DESCRIPTOR 0 774#define IDETAPE_CAPABILITIES_PAGE 0x2a 775#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ 776#define IDETAPE_BLOCK_SIZE_PAGE 0x30 777#define IDETAPE_BUFFER_FILLING_PAGE 0x33 778 779/* 780 * Mode Parameter Header for the MODE SENSE packet command 781 */ 782typedef struct { 783 __u8 mode_data_length; /* Length of the following data transfer */ 784 __u8 medium_type; /* Medium Type */ 785 __u8 dsp; /* Device Specific Parameter */ 786 __u8 bdl; /* Block Descriptor Length */ 787} idetape_mode_parameter_header_t; 788 789/* 790 * Mode Parameter Block Descriptor the MODE SENSE packet command 791 * 792 * Support for block descriptors is optional. 793 */ 794typedef struct { 795 __u8 density_code; /* Medium density code */ 796 __u8 blocks[3]; /* Number of blocks */ 797 __u8 reserved4; /* Reserved */ 798 __u8 length[3]; /* Block Length */ 799} idetape_parameter_block_descriptor_t; 800 801/* 802 * The Data Compression Page, as returned by the MODE SENSE packet command. 803 */ 804typedef struct { 805 unsigned page_code :6; /* Page Code - Should be 0xf */ 806 unsigned reserved0 :1; /* Reserved */ 807 unsigned ps :1; 808 __u8 page_length; /* Page Length - Should be 14 */ 809 unsigned reserved2 :6; /* Reserved */ 810 unsigned dcc :1; /* Data Compression Capable */ 811 unsigned dce :1; /* Data Compression Enable */ 812 unsigned reserved3 :5; /* Reserved */ 813 unsigned red :2; /* Report Exception on Decompression */ 814 unsigned dde :1; /* Data Decompression Enable */ 815 __u32 ca; /* Compression Algorithm */ 816 __u32 da; /* Decompression Algorithm */ 817 __u8 reserved[4]; /* Reserved */ 818} idetape_data_compression_page_t; 819 820/* 821 * The Medium Partition Page, as returned by the MODE SENSE packet command. 822 */ 823typedef struct { 824 unsigned page_code :6; /* Page Code - Should be 0x11 */ 825 unsigned reserved1_6 :1; /* Reserved */ 826 unsigned ps :1; 827 __u8 page_length; /* Page Length - Should be 6 */ 828 __u8 map; /* Maximum Additional Partitions - Should be 0 */ 829 __u8 apd; /* Additional Partitions Defined - Should be 0 */ 830 unsigned reserved4_012 :3; /* Reserved */ 831 unsigned psum :2; /* Should be 0 */ 832 unsigned idp :1; /* Should be 0 */ 833 unsigned sdp :1; /* Should be 0 */ 834 unsigned fdp :1; /* Fixed Data Partitions */ 835 __u8 mfr; /* Medium Format Recognition */ 836 __u8 reserved[2]; /* Reserved */ 837} idetape_medium_partition_page_t; 838 839/* 840 * Run time configurable parameters. 841 */ 842typedef struct { 843 int dsc_rw_frequency; 844 int dsc_media_access_frequency; 845 int nr_stages; 846} idetape_config_t; 847 848/* 849 * The variables below are used for the character device interface. 850 * Additional state variables are defined in our ide_drive_t structure. 851 */ 852static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; 853 854#define ide_tape_f(file) ((file)->private_data) 855 856static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 857{ 858 struct ide_tape_obj *tape = NULL; 859 860 mutex_lock(&idetape_ref_mutex); 861 tape = idetape_devs[i]; 862 if (tape) 863 kref_get(&tape->kref); 864 mutex_unlock(&idetape_ref_mutex); 865 return tape; 866} 867 868/* 869 * Function declarations 870 * 871 */ 872static int idetape_chrdev_release (struct inode *inode, struct file *filp); 873static void idetape_write_release (ide_drive_t *drive, unsigned int minor); 874 875/* 876 * Too bad. The drive wants to send us data which we are not ready to accept. 877 * Just throw it away. 878 */ 879static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) 880{ 881 while (bcount--) 882 (void) HWIF(drive)->INB(IDE_DATA_REG); 883} 884 885static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 886{ 887 struct idetape_bh *bh = pc->bh; 888 int count; 889 890 while (bcount) { 891#if IDETAPE_DEBUG_BUGS 892 if (bh == NULL) { 893 printk(KERN_ERR "ide-tape: bh == NULL in " 894 "idetape_input_buffers\n"); 895 idetape_discard_data(drive, bcount); 896 return; 897 } 898#endif /* IDETAPE_DEBUG_BUGS */ 899 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); 900 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); 901 bcount -= count; 902 atomic_add(count, &bh->b_count); 903 if (atomic_read(&bh->b_count) == bh->b_size) { 904 bh = bh->b_reqnext; 905 if (bh) 906 atomic_set(&bh->b_count, 0); 907 } 908 } 909 pc->bh = bh; 910} 911 912static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 913{ 914 struct idetape_bh *bh = pc->bh; 915 int count; 916 917 while (bcount) { 918#if IDETAPE_DEBUG_BUGS 919 if (bh == NULL) { 920 printk(KERN_ERR "ide-tape: bh == NULL in " 921 "idetape_output_buffers\n"); 922 return; 923 } 924#endif /* IDETAPE_DEBUG_BUGS */ 925 count = min((unsigned int)pc->b_count, (unsigned int)bcount); 926 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); 927 bcount -= count; 928 pc->b_data += count; 929 pc->b_count -= count; 930 if (!pc->b_count) { 931 pc->bh = bh = bh->b_reqnext; 932 if (bh) { 933 pc->b_data = bh->b_data; 934 pc->b_count = atomic_read(&bh->b_count); 935 } 936 } 937 } 938} 939 940static void idetape_update_buffers (idetape_pc_t *pc) 941{ 942 struct idetape_bh *bh = pc->bh; 943 int count; 944 unsigned int bcount = pc->actually_transferred; 945 946 if (test_bit(PC_WRITING, &pc->flags)) 947 return; 948 while (bcount) { 949#if IDETAPE_DEBUG_BUGS 950 if (bh == NULL) { 951 printk(KERN_ERR "ide-tape: bh == NULL in " 952 "idetape_update_buffers\n"); 953 return; 954 } 955#endif /* IDETAPE_DEBUG_BUGS */ 956 count = min((unsigned int)bh->b_size, (unsigned int)bcount); 957 atomic_set(&bh->b_count, count); 958 if (atomic_read(&bh->b_count) == bh->b_size) 959 bh = bh->b_reqnext; 960 bcount -= count; 961 } 962 pc->bh = bh; 963} 964 965/* 966 * idetape_next_pc_storage returns a pointer to a place in which we can 967 * safely store a packet command, even though we intend to leave the 968 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet 969 * commands is allocated at initialization time. 970 */ 971static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) 972{ 973 idetape_tape_t *tape = drive->driver_data; 974 975#if IDETAPE_DEBUG_LOG 976 if (tape->debug_level >= 5) 977 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", 978 tape->pc_stack_index); 979#endif /* IDETAPE_DEBUG_LOG */ 980 if (tape->pc_stack_index == IDETAPE_PC_STACK) 981 tape->pc_stack_index=0; 982 return (&tape->pc_stack[tape->pc_stack_index++]); 983} 984 985/* 986 * idetape_next_rq_storage is used along with idetape_next_pc_storage. 987 * Since we queue packet commands in the request queue, we need to 988 * allocate a request, along with the allocation of a packet command. 989 */ 990 991/************************************************************** 992 * * 993 * This should get fixed to use kmalloc(.., GFP_ATOMIC) * 994 * followed later on by kfree(). -ml * 995 * * 996 **************************************************************/ 997 998static struct request *idetape_next_rq_storage (ide_drive_t *drive) 999{ 1000 idetape_tape_t *tape = drive->driver_data; 1001 1002#if IDETAPE_DEBUG_LOG 1003 if (tape->debug_level >= 5) 1004 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", 1005 tape->rq_stack_index); 1006#endif /* IDETAPE_DEBUG_LOG */ 1007 if (tape->rq_stack_index == IDETAPE_PC_STACK) 1008 tape->rq_stack_index=0; 1009 return (&tape->rq_stack[tape->rq_stack_index++]); 1010} 1011 1012/* 1013 * idetape_init_pc initializes a packet command. 1014 */ 1015static void idetape_init_pc (idetape_pc_t *pc) 1016{ 1017 memset(pc->c, 0, 12); 1018 pc->retries = 0; 1019 pc->flags = 0; 1020 pc->request_transfer = 0; 1021 pc->buffer = pc->pc_buffer; 1022 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; 1023 pc->bh = NULL; 1024 pc->b_data = NULL; 1025} 1026 1027/* 1028 * idetape_analyze_error is called on each failed packet command retry 1029 * to analyze the request sense. We currently do not utilize this 1030 * information. 1031 */ 1032static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) 1033{ 1034 idetape_tape_t *tape = drive->driver_data; 1035 idetape_pc_t *pc = tape->failed_pc; 1036 1037 tape->sense = *result; 1038 tape->sense_key = result->sense_key; 1039 tape->asc = result->asc; 1040 tape->ascq = result->ascq; 1041#if IDETAPE_DEBUG_LOG 1042 /* 1043 * Without debugging, we only log an error if we decided to 1044 * give up retrying. 1045 */ 1046 if (tape->debug_level >= 1) 1047 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " 1048 "asc = %x, ascq = %x\n", 1049 pc->c[0], result->sense_key, 1050 result->asc, result->ascq); 1051#endif /* IDETAPE_DEBUG_LOG */ 1052 1053 /* 1054 * Correct pc->actually_transferred by asking the tape. 1055 */ 1056 if (test_bit(PC_DMA_ERROR, &pc->flags)) { 1057 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information)); 1058 idetape_update_buffers(pc); 1059 } 1060 1061 /* 1062 * If error was the result of a zero-length read or write command, 1063 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 1064 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 1065 */ 1066 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) 1067 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */ 1068 if (result->sense_key == 5) { 1069 /* don't report an error, everything's ok */ 1070 pc->error = 0; 1071 /* don't retry read/write */ 1072 set_bit(PC_ABORT, &pc->flags); 1073 } 1074 } 1075 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { 1076 pc->error = IDETAPE_ERROR_FILEMARK; 1077 set_bit(PC_ABORT, &pc->flags); 1078 } 1079 if (pc->c[0] == IDETAPE_WRITE_CMD) { 1080 if (result->eom || 1081 (result->sense_key == 0xd && result->asc == 0x0 && 1082 result->ascq == 0x2)) { 1083 pc->error = IDETAPE_ERROR_EOD; 1084 set_bit(PC_ABORT, &pc->flags); 1085 } 1086 } 1087 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { 1088 if (result->sense_key == 8) { 1089 pc->error = IDETAPE_ERROR_EOD; 1090 set_bit(PC_ABORT, &pc->flags); 1091 } 1092 if (!test_bit(PC_ABORT, &pc->flags) && 1093 pc->actually_transferred) 1094 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 1095 } 1096} 1097 1098/* 1099 * idetape_active_next_stage will declare the next stage as "active". 1100 */ 1101static void idetape_active_next_stage (ide_drive_t *drive) 1102{ 1103 idetape_tape_t *tape = drive->driver_data; 1104 idetape_stage_t *stage = tape->next_stage; 1105 struct request *rq = &stage->rq; 1106 1107#if IDETAPE_DEBUG_LOG 1108 if (tape->debug_level >= 4) 1109 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); 1110#endif /* IDETAPE_DEBUG_LOG */ 1111#if IDETAPE_DEBUG_BUGS 1112 if (stage == NULL) { 1113 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); 1114 return; 1115 } 1116#endif /* IDETAPE_DEBUG_BUGS */ 1117 1118 rq->rq_disk = tape->disk; 1119 rq->buffer = NULL; 1120 rq->special = (void *)stage->bh; 1121 tape->active_data_request = rq; 1122 tape->active_stage = stage; 1123 tape->next_stage = stage->next; 1124} 1125 1126/* 1127 * idetape_increase_max_pipeline_stages is a part of the feedback 1128 * loop which tries to find the optimum number of stages. In the 1129 * feedback loop, we are starting from a minimum maximum number of 1130 * stages, and if we sense that the pipeline is empty, we try to 1131 * increase it, until we reach the user compile time memory limit. 1132 */ 1133static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) 1134{ 1135 idetape_tape_t *tape = drive->driver_data; 1136 int increase = (tape->max_pipeline - tape->min_pipeline) / 10; 1137 1138#if IDETAPE_DEBUG_LOG 1139 if (tape->debug_level >= 4) 1140 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); 1141#endif /* IDETAPE_DEBUG_LOG */ 1142 1143 tape->max_stages += max(increase, 1); 1144 tape->max_stages = max(tape->max_stages, tape->min_pipeline); 1145 tape->max_stages = min(tape->max_stages, tape->max_pipeline); 1146} 1147 1148/* 1149 * idetape_kfree_stage calls kfree to completely free a stage, along with 1150 * its related buffers. 1151 */ 1152static void __idetape_kfree_stage (idetape_stage_t *stage) 1153{ 1154 struct idetape_bh *prev_bh, *bh = stage->bh; 1155 int size; 1156 1157 while (bh != NULL) { 1158 if (bh->b_data != NULL) { 1159 size = (int) bh->b_size; 1160 while (size > 0) { 1161 free_page((unsigned long) bh->b_data); 1162 size -= PAGE_SIZE; 1163 bh->b_data += PAGE_SIZE; 1164 } 1165 } 1166 prev_bh = bh; 1167 bh = bh->b_reqnext; 1168 kfree(prev_bh); 1169 } 1170 kfree(stage); 1171} 1172 1173static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) 1174{ 1175 __idetape_kfree_stage(stage); 1176} 1177 1178/* 1179 * idetape_remove_stage_head removes tape->first_stage from the pipeline. 1180 * The caller should avoid race conditions. 1181 */ 1182static void idetape_remove_stage_head (ide_drive_t *drive) 1183{ 1184 idetape_tape_t *tape = drive->driver_data; 1185 idetape_stage_t *stage; 1186 1187#if IDETAPE_DEBUG_LOG 1188 if (tape->debug_level >= 4) 1189 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); 1190#endif /* IDETAPE_DEBUG_LOG */ 1191#if IDETAPE_DEBUG_BUGS 1192 if (tape->first_stage == NULL) { 1193 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); 1194 return; 1195 } 1196 if (tape->active_stage == tape->first_stage) { 1197 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); 1198 return; 1199 } 1200#endif /* IDETAPE_DEBUG_BUGS */ 1201 stage = tape->first_stage; 1202 tape->first_stage = stage->next; 1203 idetape_kfree_stage(tape, stage); 1204 tape->nr_stages--; 1205 if (tape->first_stage == NULL) { 1206 tape->last_stage = NULL; 1207#if IDETAPE_DEBUG_BUGS 1208 if (tape->next_stage != NULL) 1209 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); 1210 if (tape->nr_stages) 1211 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); 1212#endif /* IDETAPE_DEBUG_BUGS */ 1213 } 1214} 1215 1216/* 1217 * This will free all the pipeline stages starting from new_last_stage->next 1218 * to the end of the list, and point tape->last_stage to new_last_stage. 1219 */ 1220static void idetape_abort_pipeline(ide_drive_t *drive, 1221 idetape_stage_t *new_last_stage) 1222{ 1223 idetape_tape_t *tape = drive->driver_data; 1224 idetape_stage_t *stage = new_last_stage->next; 1225 idetape_stage_t *nstage; 1226 1227#if IDETAPE_DEBUG_LOG 1228 if (tape->debug_level >= 4) 1229 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); 1230#endif 1231 while (stage) { 1232 nstage = stage->next; 1233 idetape_kfree_stage(tape, stage); 1234 --tape->nr_stages; 1235 --tape->nr_pending_stages; 1236 stage = nstage; 1237 } 1238 if (new_last_stage) 1239 new_last_stage->next = NULL; 1240 tape->last_stage = new_last_stage; 1241 tape->next_stage = NULL; 1242} 1243 1244/* 1245 * idetape_end_request is used to finish servicing a request, and to 1246 * insert a pending pipeline request into the main device queue. 1247 */ 1248static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) 1249{ 1250 struct request *rq = HWGROUP(drive)->rq; 1251 idetape_tape_t *tape = drive->driver_data; 1252 unsigned long flags; 1253 int error; 1254 int remove_stage = 0; 1255 idetape_stage_t *active_stage; 1256 1257#if IDETAPE_DEBUG_LOG 1258 if (tape->debug_level >= 4) 1259 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); 1260#endif /* IDETAPE_DEBUG_LOG */ 1261 1262 switch (uptodate) { 1263 case 0: error = IDETAPE_ERROR_GENERAL; break; 1264 case 1: error = 0; break; 1265 default: error = uptodate; 1266 } 1267 rq->errors = error; 1268 if (error) 1269 tape->failed_pc = NULL; 1270 1271 if (!blk_special_request(rq)) { 1272 ide_end_request(drive, uptodate, nr_sects); 1273 return 0; 1274 } 1275 1276 spin_lock_irqsave(&tape->spinlock, flags); 1277 1278 /* The request was a pipelined data transfer request */ 1279 if (tape->active_data_request == rq) { 1280 active_stage = tape->active_stage; 1281 tape->active_stage = NULL; 1282 tape->active_data_request = NULL; 1283 tape->nr_pending_stages--; 1284 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 1285 remove_stage = 1; 1286 if (error) { 1287 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1288 if (error == IDETAPE_ERROR_EOD) 1289 idetape_abort_pipeline(drive, active_stage); 1290 } 1291 } else if (rq->cmd[0] & REQ_IDETAPE_READ) { 1292 if (error == IDETAPE_ERROR_EOD) { 1293 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1294 idetape_abort_pipeline(drive, active_stage); 1295 } 1296 } 1297 if (tape->next_stage != NULL) { 1298 idetape_active_next_stage(drive); 1299 1300 /* 1301 * Insert the next request into the request queue. 1302 */ 1303 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 1304 } else if (!error) { 1305 idetape_increase_max_pipeline_stages(drive); 1306 } 1307 } 1308 ide_end_drive_cmd(drive, 0, 0); 1309// blkdev_dequeue_request(rq); 1310// drive->rq = NULL; 1311// end_that_request_last(rq); 1312 1313 if (remove_stage) 1314 idetape_remove_stage_head(drive); 1315 if (tape->active_data_request == NULL) 1316 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 1317 spin_unlock_irqrestore(&tape->spinlock, flags); 1318 return 0; 1319} 1320 1321static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) 1322{ 1323 idetape_tape_t *tape = drive->driver_data; 1324 1325#if IDETAPE_DEBUG_LOG 1326 if (tape->debug_level >= 4) 1327 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); 1328#endif /* IDETAPE_DEBUG_LOG */ 1329 if (!tape->pc->error) { 1330 idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer); 1331 idetape_end_request(drive, 1, 0); 1332 } else { 1333 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); 1334 idetape_end_request(drive, 0, 0); 1335 } 1336 return ide_stopped; 1337} 1338 1339static void idetape_create_request_sense_cmd (idetape_pc_t *pc) 1340{ 1341 idetape_init_pc(pc); 1342 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; 1343 pc->c[4] = 20; 1344 pc->request_transfer = 20; 1345 pc->callback = &idetape_request_sense_callback; 1346} 1347 1348static void idetape_init_rq(struct request *rq, u8 cmd) 1349{ 1350 memset(rq, 0, sizeof(*rq)); 1351 rq->cmd_type = REQ_TYPE_SPECIAL; 1352 rq->cmd[0] = cmd; 1353} 1354 1355/* 1356 * idetape_queue_pc_head generates a new packet command request in front 1357 * of the request queue, before the current request, so that it will be 1358 * processed immediately, on the next pass through the driver. 1359 * 1360 * idetape_queue_pc_head is called from the request handling part of 1361 * the driver (the "bottom" part). Safe storage for the request should 1362 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage 1363 * before calling idetape_queue_pc_head. 1364 * 1365 * Memory for those requests is pre-allocated at initialization time, and 1366 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough 1367 * space for the maximum possible number of inter-dependent packet commands. 1368 * 1369 * The higher level of the driver - The ioctl handler and the character 1370 * device handling functions should queue request to the lower level part 1371 * and wait for their completion using idetape_queue_pc_tail or 1372 * idetape_queue_rw_tail. 1373 */ 1374static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) 1375{ 1376 struct ide_tape_obj *tape = drive->driver_data; 1377 1378 idetape_init_rq(rq, REQ_IDETAPE_PC1); 1379 rq->buffer = (char *) pc; 1380 rq->rq_disk = tape->disk; 1381 (void) ide_do_drive_cmd(drive, rq, ide_preempt); 1382} 1383 1384/* 1385 * idetape_retry_pc is called when an error was detected during the 1386 * last packet command. We queue a request sense packet command in 1387 * the head of the request list. 1388 */ 1389static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) 1390{ 1391 idetape_tape_t *tape = drive->driver_data; 1392 idetape_pc_t *pc; 1393 struct request *rq; 1394 1395 (void)drive->hwif->INB(IDE_ERROR_REG); 1396 pc = idetape_next_pc_storage(drive); 1397 rq = idetape_next_rq_storage(drive); 1398 idetape_create_request_sense_cmd(pc); 1399 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 1400 idetape_queue_pc_head(drive, pc, rq); 1401 return ide_stopped; 1402} 1403 1404/* 1405 * idetape_postpone_request postpones the current request so that 1406 * ide.c will be able to service requests from another device on 1407 * the same hwgroup while we are polling for DSC. 1408 */ 1409static void idetape_postpone_request (ide_drive_t *drive) 1410{ 1411 idetape_tape_t *tape = drive->driver_data; 1412 1413#if IDETAPE_DEBUG_LOG 1414 if (tape->debug_level >= 4) 1415 printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); 1416#endif 1417 tape->postponed_rq = HWGROUP(drive)->rq; 1418 ide_stall_queue(drive, tape->dsc_polling_frequency); 1419} 1420 1421/* 1422 * idetape_pc_intr is the usual interrupt handler which will be called 1423 * during a packet command. We will transfer some of the data (as 1424 * requested by the drive) and will re-point interrupt handler to us. 1425 * When data transfer is finished, we will act according to the 1426 * algorithm described before idetape_issue_packet_command. 1427 * 1428 */ 1429static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) 1430{ 1431 ide_hwif_t *hwif = drive->hwif; 1432 idetape_tape_t *tape = drive->driver_data; 1433 idetape_pc_t *pc = tape->pc; 1434 unsigned int temp; 1435#if SIMULATE_ERRORS 1436 static int error_sim_count = 0; 1437#endif 1438 u16 bcount; 1439 u8 stat, ireason; 1440 1441#if IDETAPE_DEBUG_LOG 1442 if (tape->debug_level >= 4) 1443 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " 1444 "interrupt handler\n"); 1445#endif /* IDETAPE_DEBUG_LOG */ 1446 1447 /* Clear the interrupt */ 1448 stat = hwif->INB(IDE_STATUS_REG); 1449 1450 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1451 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) { 1452 /* 1453 * A DMA error is sometimes expected. For example, 1454 * if the tape is crossing a filemark during a 1455 * READ command, it will issue an irq and position 1456 * itself before the filemark, so that only a partial 1457 * data transfer will occur (which causes the DMA 1458 * error). In that case, we will later ask the tape 1459 * how much bytes of the original request were 1460 * actually transferred (we can't receive that 1461 * information from the DMA engine on most chipsets). 1462 */ 1463 1464 /* 1465 * On the contrary, a DMA error is never expected; 1466 * it usually indicates a hardware error or abort. 1467 * If the tape crosses a filemark during a READ 1468 * command, it will issue an irq and position itself 1469 * after the filemark (not before). Only a partial 1470 * data transfer will occur, but no DMA error. 1471 * (AS, 19 Apr 2001) 1472 */ 1473 set_bit(PC_DMA_ERROR, &pc->flags); 1474 } else { 1475 pc->actually_transferred = pc->request_transfer; 1476 idetape_update_buffers(pc); 1477 } 1478#if IDETAPE_DEBUG_LOG 1479 if (tape->debug_level >= 4) 1480 printk(KERN_INFO "ide-tape: DMA finished\n"); 1481#endif /* IDETAPE_DEBUG_LOG */ 1482 } 1483 1484 /* No more interrupts */ 1485 if ((stat & DRQ_STAT) == 0) { 1486#if IDETAPE_DEBUG_LOG 1487 if (tape->debug_level >= 2) 1488 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); 1489#endif /* IDETAPE_DEBUG_LOG */ 1490 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); 1491 1492 local_irq_enable(); 1493 1494#if SIMULATE_ERRORS 1495 if ((pc->c[0] == IDETAPE_WRITE_CMD || 1496 pc->c[0] == IDETAPE_READ_CMD) && 1497 (++error_sim_count % 100) == 0) { 1498 printk(KERN_INFO "ide-tape: %s: simulating error\n", 1499 tape->name); 1500 stat |= ERR_STAT; 1501 } 1502#endif 1503 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) 1504 stat &= ~ERR_STAT; 1505 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) { 1506 /* Error detected */ 1507#if IDETAPE_DEBUG_LOG 1508 if (tape->debug_level >= 1) 1509 printk(KERN_INFO "ide-tape: %s: I/O error\n", 1510 tape->name); 1511#endif /* IDETAPE_DEBUG_LOG */ 1512 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1513 printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); 1514 return ide_do_reset(drive); 1515 } 1516#if IDETAPE_DEBUG_LOG 1517 if (tape->debug_level >= 1) 1518 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); 1519#endif 1520 /* Retry operation */ 1521 return idetape_retry_pc(drive); 1522 } 1523 pc->error = 0; 1524 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && 1525 (stat & SEEK_STAT) == 0) { 1526 /* Media access command */ 1527 tape->dsc_polling_start = jiffies; 1528 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; 1529 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 1530 /* Allow ide.c to handle other requests */ 1531 idetape_postpone_request(drive); 1532 return ide_stopped; 1533 } 1534 if (tape->failed_pc == pc) 1535 tape->failed_pc = NULL; 1536 /* Command finished - Call the callback function */ 1537 return pc->callback(drive); 1538 } 1539 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1540 printk(KERN_ERR "ide-tape: The tape wants to issue more " 1541 "interrupts in DMA mode\n"); 1542 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); 1543 ide_dma_off(drive); 1544 return ide_do_reset(drive); 1545 } 1546 /* Get the number of bytes to transfer on this interrupt. */ 1547 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | 1548 hwif->INB(IDE_BCOUNTL_REG); 1549 1550 ireason = hwif->INB(IDE_IREASON_REG); 1551 1552 if (ireason & CD) { 1553 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); 1554 return ide_do_reset(drive); 1555 } 1556 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) { 1557 /* Hopefully, we will never get here */ 1558 printk(KERN_ERR "ide-tape: We wanted to %s, ", 1559 (ireason & IO) ? "Write" : "Read"); 1560 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", 1561 (ireason & IO) ? "Read" : "Write"); 1562 return ide_do_reset(drive); 1563 } 1564 if (!test_bit(PC_WRITING, &pc->flags)) { 1565 /* Reading - Check that we have enough space */ 1566 temp = pc->actually_transferred + bcount; 1567 if (temp > pc->request_transfer) { 1568 if (temp > pc->buffer_size) { 1569 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); 1570 idetape_discard_data(drive, bcount); 1571 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1572 return ide_started; 1573 } 1574#if IDETAPE_DEBUG_LOG 1575 if (tape->debug_level >= 2) 1576 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); 1577#endif /* IDETAPE_DEBUG_LOG */ 1578 } 1579 } 1580 if (test_bit(PC_WRITING, &pc->flags)) { 1581 if (pc->bh != NULL) 1582 idetape_output_buffers(drive, pc, bcount); 1583 else 1584 /* Write the current buffer */ 1585 hwif->atapi_output_bytes(drive, pc->current_position, 1586 bcount); 1587 } else { 1588 if (pc->bh != NULL) 1589 idetape_input_buffers(drive, pc, bcount); 1590 else 1591 /* Read the current buffer */ 1592 hwif->atapi_input_bytes(drive, pc->current_position, 1593 bcount); 1594 } 1595 /* Update the current position */ 1596 pc->actually_transferred += bcount; 1597 pc->current_position += bcount; 1598#if IDETAPE_DEBUG_LOG 1599 if (tape->debug_level >= 2) 1600 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes " 1601 "on that interrupt\n", pc->c[0], bcount); 1602#endif 1603 /* And set the interrupt handler again */ 1604 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1605 return ide_started; 1606} 1607 1608/* 1609 * Packet Command Interface 1610 * 1611 * The current Packet Command is available in tape->pc, and will not 1612 * change until we finish handling it. Each packet command is associated 1613 * with a callback function that will be called when the command is 1614 * finished. 1615 * 1616 * The handling will be done in three stages: 1617 * 1618 * 1. idetape_issue_packet_command will send the packet command to the 1619 * drive, and will set the interrupt handler to idetape_pc_intr. 1620 * 1621 * 2. On each interrupt, idetape_pc_intr will be called. This step 1622 * will be repeated until the device signals us that no more 1623 * interrupts will be issued. 1624 * 1625 * 3. ATAPI Tape media access commands have immediate status with a 1626 * delayed process. In case of a successful initiation of a 1627 * media access packet command, the DSC bit will be set when the 1628 * actual execution of the command is finished. 1629 * Since the tape drive will not issue an interrupt, we have to 1630 * poll for this event. In this case, we define the request as 1631 * "low priority request" by setting rq_status to 1632 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit 1633 * the driver. 1634 * 1635 * ide.c will then give higher priority to requests which 1636 * originate from the other device, until will change rq_status 1637 * to RQ_ACTIVE. 1638 * 1639 * 4. When the packet command is finished, it will be checked for errors. 1640 * 1641 * 5. In case an error was found, we queue a request sense packet 1642 * command in front of the request queue and retry the operation 1643 * up to IDETAPE_MAX_PC_RETRIES times. 1644 * 1645 * 6. In case no error was found, or we decided to give up and not 1646 * to retry again, the callback function will be called and then 1647 * we will handle the next request. 1648 * 1649 */ 1650static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 1651{ 1652 ide_hwif_t *hwif = drive->hwif; 1653 idetape_tape_t *tape = drive->driver_data; 1654 idetape_pc_t *pc = tape->pc; 1655 int retries = 100; 1656 ide_startstop_t startstop; 1657 u8 ireason; 1658 1659 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { 1660 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); 1661 return startstop; 1662 } 1663 ireason = hwif->INB(IDE_IREASON_REG); 1664 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { 1665 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " 1666 "a packet command, retrying\n"); 1667 udelay(100); 1668 ireason = hwif->INB(IDE_IREASON_REG); 1669 if (retries == 0) { 1670 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " 1671 "issuing a packet command, ignoring\n"); 1672 ireason |= CD; 1673 ireason &= ~IO; 1674 } 1675 } 1676 if ((ireason & CD) == 0 || (ireason & IO)) { 1677 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " 1678 "a packet command\n"); 1679 return ide_do_reset(drive); 1680 } 1681 /* Set the interrupt routine */ 1682 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1683#ifdef CONFIG_BLK_DEV_IDEDMA 1684 /* Begin DMA, if necessary */ 1685 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) 1686 hwif->dma_start(drive); 1687#endif 1688 /* Send the actual packet */ 1689 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); 1690 return ide_started; 1691} 1692 1693static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) 1694{ 1695 ide_hwif_t *hwif = drive->hwif; 1696 idetape_tape_t *tape = drive->driver_data; 1697 int dma_ok = 0; 1698 u16 bcount; 1699 1700#if IDETAPE_DEBUG_BUGS 1701 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && 1702 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1703 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " 1704 "Two request sense in serial were issued\n"); 1705 } 1706#endif /* IDETAPE_DEBUG_BUGS */ 1707 1708 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) 1709 tape->failed_pc = pc; 1710 /* Set the current packet command */ 1711 tape->pc = pc; 1712 1713 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 1714 test_bit(PC_ABORT, &pc->flags)) { 1715 /* 1716 * We will "abort" retrying a packet command in case 1717 * a legitimate error code was received (crossing a 1718 * filemark, or end of the media, for example). 1719 */ 1720 if (!test_bit(PC_ABORT, &pc->flags)) { 1721 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && 1722 tape->sense_key == 2 && tape->asc == 4 && 1723 (tape->ascq == 1 || tape->ascq == 8))) { 1724 printk(KERN_ERR "ide-tape: %s: I/O error, " 1725 "pc = %2x, key = %2x, " 1726 "asc = %2x, ascq = %2x\n", 1727 tape->name, pc->c[0], 1728 tape->sense_key, tape->asc, 1729 tape->ascq); 1730 } 1731 /* Giving up */ 1732 pc->error = IDETAPE_ERROR_GENERAL; 1733 } 1734 tape->failed_pc = NULL; 1735 return pc->callback(drive); 1736 } 1737#if IDETAPE_DEBUG_LOG 1738 if (tape->debug_level >= 2) 1739 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); 1740#endif /* IDETAPE_DEBUG_LOG */ 1741 1742 pc->retries++; 1743 /* We haven't transferred any data yet */ 1744 pc->actually_transferred = 0; 1745 pc->current_position = pc->buffer; 1746 /* Request to transfer the entire buffer at once */ 1747 bcount = pc->request_transfer; 1748 1749 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { 1750 printk(KERN_WARNING "ide-tape: DMA disabled, " 1751 "reverting to PIO\n"); 1752 ide_dma_off(drive); 1753 } 1754 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) 1755 dma_ok = !hwif->dma_setup(drive); 1756 1757 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | 1758 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); 1759 1760 if (dma_ok) /* Will begin DMA later */ 1761 set_bit(PC_DMA_IN_PROGRESS, &pc->flags); 1762 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { 1763 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, 1764 IDETAPE_WAIT_CMD, NULL); 1765 return ide_started; 1766 } else { 1767 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); 1768 return idetape_transfer_pc(drive); 1769 } 1770} 1771 1772/* 1773 * General packet command callback function. 1774 */ 1775static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) 1776{ 1777 idetape_tape_t *tape = drive->driver_data; 1778 1779#if IDETAPE_DEBUG_LOG 1780 if (tape->debug_level >= 4) 1781 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); 1782#endif /* IDETAPE_DEBUG_LOG */ 1783 1784 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); 1785 return ide_stopped; 1786} 1787 1788/* 1789 * A mode sense command is used to "sense" tape parameters. 1790 */ 1791static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) 1792{ 1793 idetape_init_pc(pc); 1794 pc->c[0] = IDETAPE_MODE_SENSE_CMD; 1795 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 1796 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ 1797 pc->c[2] = page_code; 1798 /* 1799 * Changed pc->c[3] to 0 (255 will at best return unused info). 1800 * 1801 * For SCSI this byte is defined as subpage instead of high byte 1802 * of length and some IDE drives seem to interpret it this way 1803 * and return an error when 255 is used. 1804 */ 1805 pc->c[3] = 0; 1806 pc->c[4] = 255; /* (We will just discard data in that case) */ 1807 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 1808 pc->request_transfer = 12; 1809 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 1810 pc->request_transfer = 24; 1811 else 1812 pc->request_transfer = 50; 1813 pc->callback = &idetape_pc_callback; 1814} 1815 1816static void calculate_speeds(ide_drive_t *drive) 1817{ 1818 idetape_tape_t *tape = drive->driver_data; 1819 int full = 125, empty = 75; 1820 1821 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { 1822 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; 1823 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; 1824 tape->controlled_last_pipeline_head = tape->pipeline_head; 1825 tape->controlled_pipeline_head_time = jiffies; 1826 } 1827 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) 1828 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); 1829 else if (time_after(jiffies, tape->controlled_previous_head_time)) 1830 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); 1831 1832 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { 1833 /* -1 for read mode error recovery */ 1834 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { 1835 tape->uncontrolled_pipeline_head_time = jiffies; 1836 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); 1837 } 1838 } else { 1839 tape->uncontrolled_previous_head_time = jiffies; 1840 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; 1841 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { 1842 tape->uncontrolled_pipeline_head_time = jiffies; 1843 } 1844 } 1845 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); 1846 if (tape->speed_control == 0) { 1847 tape->max_insert_speed = 5000; 1848 } else if (tape->speed_control == 1) { 1849 if (tape->nr_pending_stages >= tape->max_stages / 2) 1850 tape->max_insert_speed = tape->pipeline_head_speed + 1851 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; 1852 else 1853 tape->max_insert_speed = 500 + 1854 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; 1855 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) 1856 tape->max_insert_speed = 5000; 1857 } else if (tape->speed_control == 2) { 1858 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + 1859 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; 1860 } else 1861 tape->max_insert_speed = tape->speed_control; 1862 tape->max_insert_speed = max(tape->max_insert_speed, 500); 1863} 1864 1865static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) 1866{ 1867 idetape_tape_t *tape = drive->driver_data; 1868 idetape_pc_t *pc = tape->pc; 1869 u8 stat; 1870 1871 stat = drive->hwif->INB(IDE_STATUS_REG); 1872 if (stat & SEEK_STAT) { 1873 if (stat & ERR_STAT) { 1874 /* Error detected */ 1875 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) 1876 printk(KERN_ERR "ide-tape: %s: I/O error, ", 1877 tape->name); 1878 /* Retry operation */ 1879 return idetape_retry_pc(drive); 1880 } 1881 pc->error = 0; 1882 if (tape->failed_pc == pc) 1883 tape->failed_pc = NULL; 1884 } else { 1885 pc->error = IDETAPE_ERROR_GENERAL; 1886 tape->failed_pc = NULL; 1887 } 1888 return pc->callback(drive); 1889} 1890 1891static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) 1892{ 1893 idetape_tape_t *tape = drive->driver_data; 1894 struct request *rq = HWGROUP(drive)->rq; 1895 int blocks = tape->pc->actually_transferred / tape->tape_block_size; 1896 1897 tape->avg_size += blocks * tape->tape_block_size; 1898 tape->insert_size += blocks * tape->tape_block_size; 1899 if (tape->insert_size > 1024 * 1024) 1900 tape->measure_insert_time = 1; 1901 if (tape->measure_insert_time) { 1902 tape->measure_insert_time = 0; 1903 tape->insert_time = jiffies; 1904 tape->insert_size = 0; 1905 } 1906 if (time_after(jiffies, tape->insert_time)) 1907 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 1908 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 1909 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; 1910 tape->avg_size = 0; 1911 tape->avg_time = jiffies; 1912 } 1913 1914#if IDETAPE_DEBUG_LOG 1915 if (tape->debug_level >= 4) 1916 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); 1917#endif /* IDETAPE_DEBUG_LOG */ 1918 1919 tape->first_frame_position += blocks; 1920 rq->current_nr_sectors -= blocks; 1921 1922 if (!tape->pc->error) 1923 idetape_end_request(drive, 1, 0); 1924 else 1925 idetape_end_request(drive, tape->pc->error, 0); 1926 return ide_stopped; 1927} 1928 1929static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 1930{ 1931 idetape_init_pc(pc); 1932 pc->c[0] = IDETAPE_READ_CMD; 1933 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 1934 pc->c[1] = 1; 1935 pc->callback = &idetape_rw_callback; 1936 pc->bh = bh; 1937 atomic_set(&bh->b_count, 0); 1938 pc->buffer = NULL; 1939 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 1940 if (pc->request_transfer == tape->stage_size) 1941 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 1942} 1943 1944static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 1945{ 1946 int size = 32768; 1947 struct idetape_bh *p = bh; 1948 1949 idetape_init_pc(pc); 1950 pc->c[0] = IDETAPE_READ_BUFFER_CMD; 1951 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; 1952 pc->c[7] = size >> 8; 1953 pc->c[8] = size & 0xff; 1954 pc->callback = &idetape_pc_callback; 1955 pc->bh = bh; 1956 atomic_set(&bh->b_count, 0); 1957 pc->buffer = NULL; 1958 while (p) { 1959 atomic_set(&p->b_count, 0); 1960 p = p->b_reqnext; 1961 } 1962 pc->request_transfer = pc->buffer_size = size; 1963} 1964 1965static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 1966{ 1967 idetape_init_pc(pc); 1968 pc->c[0] = IDETAPE_WRITE_CMD; 1969 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 1970 pc->c[1] = 1; 1971 pc->callback = &idetape_rw_callback; 1972 set_bit(PC_WRITING, &pc->flags); 1973 pc->bh = bh; 1974 pc->b_data = bh->b_data; 1975 pc->b_count = atomic_read(&bh->b_count); 1976 pc->buffer = NULL; 1977 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 1978 if (pc->request_transfer == tape->stage_size) 1979 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 1980} 1981 1982/* 1983 * idetape_do_request is our request handling function. 1984 */ 1985static ide_startstop_t idetape_do_request(ide_drive_t *drive, 1986 struct request *rq, sector_t block) 1987{ 1988 idetape_tape_t *tape = drive->driver_data; 1989 idetape_pc_t *pc = NULL; 1990 struct request *postponed_rq = tape->postponed_rq; 1991 u8 stat; 1992 1993#if IDETAPE_DEBUG_LOG 1994 if (tape->debug_level >= 2) 1995 printk(KERN_INFO "ide-tape: sector: %ld, " 1996 "nr_sectors: %ld, current_nr_sectors: %d\n", 1997 rq->sector, rq->nr_sectors, rq->current_nr_sectors); 1998#endif /* IDETAPE_DEBUG_LOG */ 1999 2000 if (!blk_special_request(rq)) { 2001 /* 2002 * We do not support buffer cache originated requests. 2003 */ 2004 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 2005 "request queue (%d)\n", drive->name, rq->cmd_type); 2006 ide_end_request(drive, 0, 0); 2007 return ide_stopped; 2008 } 2009 2010 /* 2011 * Retry a failed packet command 2012 */ 2013 if (tape->failed_pc != NULL && 2014 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 2015 return idetape_issue_packet_command(drive, tape->failed_pc); 2016 } 2017#if IDETAPE_DEBUG_BUGS 2018 if (postponed_rq != NULL) 2019 if (rq != postponed_rq) { 2020 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 2021 "Two DSC requests were queued\n"); 2022 idetape_end_request(drive, 0, 0); 2023 return ide_stopped; 2024 } 2025#endif /* IDETAPE_DEBUG_BUGS */ 2026 2027 tape->postponed_rq = NULL; 2028 2029 /* 2030 * If the tape is still busy, postpone our request and service 2031 * the other device meanwhile. 2032 */ 2033 stat = drive->hwif->INB(IDE_STATUS_REG); 2034 2035 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) 2036 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 2037 2038 if (drive->post_reset == 1) { 2039 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 2040 drive->post_reset = 0; 2041 } 2042 2043 if (tape->tape_still_time > 100 && tape->tape_still_time < 200) 2044 tape->measure_insert_time = 1; 2045 if (time_after(jiffies, tape->insert_time)) 2046 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2047 calculate_speeds(drive); 2048 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && 2049 (stat & SEEK_STAT) == 0) { 2050 if (postponed_rq == NULL) { 2051 tape->dsc_polling_start = jiffies; 2052 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; 2053 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 2054 } else if (time_after(jiffies, tape->dsc_timeout)) { 2055 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 2056 tape->name); 2057 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 2058 idetape_media_access_finished(drive); 2059 return ide_stopped; 2060 } else { 2061 return ide_do_reset(drive); 2062 } 2063 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD)) 2064 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; 2065 idetape_postpone_request(drive); 2066 return ide_stopped; 2067 } 2068 if (rq->cmd[0] & REQ_IDETAPE_READ) { 2069 tape->buffer_head++; 2070 tape->postpone_cnt = 0; 2071 pc = idetape_next_pc_storage(drive); 2072 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2073 goto out; 2074 } 2075 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 2076 tape->buffer_head++; 2077 tape->postpone_cnt = 0; 2078 pc = idetape_next_pc_storage(drive); 2079 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2080 goto out; 2081 } 2082 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { 2083 tape->postpone_cnt = 0; 2084 pc = idetape_next_pc_storage(drive); 2085 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2086 goto out; 2087 } 2088 if (rq->cmd[0] & REQ_IDETAPE_PC1) { 2089 pc = (idetape_pc_t *) rq->buffer; 2090 rq->cmd[0] &= ~(REQ_IDETAPE_PC1); 2091 rq->cmd[0] |= REQ_IDETAPE_PC2; 2092 goto out; 2093 } 2094 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 2095 idetape_media_access_finished(drive); 2096 return ide_stopped; 2097 } 2098 BUG(); 2099out: 2100 return idetape_issue_packet_command(drive, pc); 2101} 2102 2103/* 2104 * Pipeline related functions 2105 */ 2106static inline int idetape_pipeline_active (idetape_tape_t *tape) 2107{ 2108 int rc1, rc2; 2109 2110 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2111 rc2 = (tape->active_data_request != NULL); 2112 return rc1; 2113} 2114 2115/* 2116 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline 2117 * stage, along with all the necessary small buffers which together make 2118 * a buffer of size tape->stage_size (or a bit more). We attempt to 2119 * combine sequential pages as much as possible. 2120 * 2121 * Returns a pointer to the new allocated stage, or NULL if we 2122 * can't (or don't want to) allocate a stage. 2123 * 2124 * Pipeline stages are optional and are used to increase performance. 2125 * If we can't allocate them, we'll manage without them. 2126 */ 2127static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) 2128{ 2129 idetape_stage_t *stage; 2130 struct idetape_bh *prev_bh, *bh; 2131 int pages = tape->pages_per_stage; 2132 char *b_data = NULL; 2133 2134 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) 2135 return NULL; 2136 stage->next = NULL; 2137 2138 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 2139 if (bh == NULL) 2140 goto abort; 2141 bh->b_reqnext = NULL; 2142 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2143 goto abort; 2144 if (clear) 2145 memset(bh->b_data, 0, PAGE_SIZE); 2146 bh->b_size = PAGE_SIZE; 2147 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2148 2149 while (--pages) { 2150 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2151 goto abort; 2152 if (clear) 2153 memset(b_data, 0, PAGE_SIZE); 2154 if (bh->b_data == b_data + PAGE_SIZE) { 2155 bh->b_size += PAGE_SIZE; 2156 bh->b_data -= PAGE_SIZE; 2157 if (full) 2158 atomic_add(PAGE_SIZE, &bh->b_count); 2159 continue; 2160 } 2161 if (b_data == bh->b_data + bh->b_size) { 2162 bh->b_size += PAGE_SIZE; 2163 if (full) 2164 atomic_add(PAGE_SIZE, &bh->b_count); 2165 continue; 2166 } 2167 prev_bh = bh; 2168 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { 2169 free_page((unsigned long) b_data); 2170 goto abort; 2171 } 2172 bh->b_reqnext = NULL; 2173 bh->b_data = b_data; 2174 bh->b_size = PAGE_SIZE; 2175 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2176 prev_bh->b_reqnext = bh; 2177 } 2178 bh->b_size -= tape->excess_bh_size; 2179 if (full) 2180 atomic_sub(tape->excess_bh_size, &bh->b_count); 2181 return stage; 2182abort: 2183 __idetape_kfree_stage(stage); 2184 return NULL; 2185} 2186 2187static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) 2188{ 2189 idetape_stage_t *cache_stage = tape->cache_stage; 2190 2191#if IDETAPE_DEBUG_LOG 2192 if (tape->debug_level >= 4) 2193 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); 2194#endif /* IDETAPE_DEBUG_LOG */ 2195 2196 if (tape->nr_stages >= tape->max_stages) 2197 return NULL; 2198 if (cache_stage != NULL) { 2199 tape->cache_stage = NULL; 2200 return cache_stage; 2201 } 2202 return __idetape_kmalloc_stage(tape, 0, 0); 2203} 2204 2205static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) 2206{ 2207 struct idetape_bh *bh = tape->bh; 2208 int count; 2209 int ret = 0; 2210 2211 while (n) { 2212#if IDETAPE_DEBUG_BUGS 2213 if (bh == NULL) { 2214 printk(KERN_ERR "ide-tape: bh == NULL in " 2215 "idetape_copy_stage_from_user\n"); 2216 return 1; 2217 } 2218#endif /* IDETAPE_DEBUG_BUGS */ 2219 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); 2220 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count)) 2221 ret = 1; 2222 n -= count; 2223 atomic_add(count, &bh->b_count); 2224 buf += count; 2225 if (atomic_read(&bh->b_count) == bh->b_size) { 2226 bh = bh->b_reqnext; 2227 if (bh) 2228 atomic_set(&bh->b_count, 0); 2229 } 2230 } 2231 tape->bh = bh; 2232 return ret; 2233} 2234 2235static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) 2236{ 2237 struct idetape_bh *bh = tape->bh; 2238 int count; 2239 int ret = 0; 2240 2241 while (n) { 2242#if IDETAPE_DEBUG_BUGS 2243 if (bh == NULL) { 2244 printk(KERN_ERR "ide-tape: bh == NULL in " 2245 "idetape_copy_stage_to_user\n"); 2246 return 1; 2247 } 2248#endif /* IDETAPE_DEBUG_BUGS */ 2249 count = min(tape->b_count, n); 2250 if (copy_to_user(buf, tape->b_data, count)) 2251 ret = 1; 2252 n -= count; 2253 tape->b_data += count; 2254 tape->b_count -= count; 2255 buf += count; 2256 if (!tape->b_count) { 2257 tape->bh = bh = bh->b_reqnext; 2258 if (bh) { 2259 tape->b_data = bh->b_data; 2260 tape->b_count = atomic_read(&bh->b_count); 2261 } 2262 } 2263 } 2264 return ret; 2265} 2266 2267static void idetape_init_merge_stage (idetape_tape_t *tape) 2268{ 2269 struct idetape_bh *bh = tape->merge_stage->bh; 2270 2271 tape->bh = bh; 2272 if (tape->chrdev_direction == idetape_direction_write) 2273 atomic_set(&bh->b_count, 0); 2274 else { 2275 tape->b_data = bh->b_data; 2276 tape->b_count = atomic_read(&bh->b_count); 2277 } 2278} 2279 2280static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) 2281{ 2282 struct idetape_bh *tmp; 2283 2284 tmp = stage->bh; 2285 stage->bh = tape->merge_stage->bh; 2286 tape->merge_stage->bh = tmp; 2287 idetape_init_merge_stage(tape); 2288} 2289 2290/* 2291 * idetape_add_stage_tail adds a new stage at the end of the pipeline. 2292 */ 2293static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) 2294{ 2295 idetape_tape_t *tape = drive->driver_data; 2296 unsigned long flags; 2297 2298#if IDETAPE_DEBUG_LOG 2299 if (tape->debug_level >= 4) 2300 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); 2301#endif /* IDETAPE_DEBUG_LOG */ 2302 spin_lock_irqsave(&tape->spinlock, flags); 2303 stage->next = NULL; 2304 if (tape->last_stage != NULL) 2305 tape->last_stage->next=stage; 2306 else 2307 tape->first_stage = tape->next_stage=stage; 2308 tape->last_stage = stage; 2309 if (tape->next_stage == NULL) 2310 tape->next_stage = tape->last_stage; 2311 tape->nr_stages++; 2312 tape->nr_pending_stages++; 2313 spin_unlock_irqrestore(&tape->spinlock, flags); 2314} 2315 2316/* 2317 * idetape_wait_for_request installs a completion in a pending request 2318 * and sleeps until it is serviced. 2319 * 2320 * The caller should ensure that the request will not be serviced 2321 * before we install the completion (usually by disabling interrupts). 2322 */ 2323static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) 2324{ 2325 DECLARE_COMPLETION_ONSTACK(wait); 2326 idetape_tape_t *tape = drive->driver_data; 2327 2328#if IDETAPE_DEBUG_BUGS 2329 if (rq == NULL || !blk_special_request(rq)) { 2330 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); 2331 return; 2332 } 2333#endif /* IDETAPE_DEBUG_BUGS */ 2334 rq->end_io_data = &wait; 2335 rq->end_io = blk_end_sync_rq; 2336 spin_unlock_irq(&tape->spinlock); 2337 wait_for_completion(&wait); 2338 /* The stage and its struct request have been deallocated */ 2339 spin_lock_irq(&tape->spinlock); 2340} 2341 2342static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) 2343{ 2344 idetape_tape_t *tape = drive->driver_data; 2345 idetape_read_position_result_t *result; 2346 2347#if IDETAPE_DEBUG_LOG 2348 if (tape->debug_level >= 4) 2349 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); 2350#endif /* IDETAPE_DEBUG_LOG */ 2351 2352 if (!tape->pc->error) { 2353 result = (idetape_read_position_result_t *) tape->pc->buffer; 2354#if IDETAPE_DEBUG_LOG 2355 if (tape->debug_level >= 2) 2356 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); 2357 if (tape->debug_level >= 2) 2358 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); 2359#endif /* IDETAPE_DEBUG_LOG */ 2360 if (result->bpu) { 2361 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); 2362 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2363 idetape_end_request(drive, 0, 0); 2364 } else { 2365#if IDETAPE_DEBUG_LOG 2366 if (tape->debug_level >= 2) 2367 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); 2368#endif /* IDETAPE_DEBUG_LOG */ 2369 tape->partition = result->partition; 2370 tape->first_frame_position = ntohl(result->first_block); 2371 tape->last_frame_position = ntohl(result->last_block); 2372 tape->blocks_in_buffer = result->blocks_in_buffer[2]; 2373 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2374 idetape_end_request(drive, 1, 0); 2375 } 2376 } else { 2377 idetape_end_request(drive, 0, 0); 2378 } 2379 return ide_stopped; 2380} 2381 2382/* 2383 * idetape_create_write_filemark_cmd will: 2384 * 2385 * 1. Write a filemark if write_filemark=1. 2386 * 2. Flush the device buffers without writing a filemark 2387 * if write_filemark=0. 2388 * 2389 */ 2390static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) 2391{ 2392 idetape_init_pc(pc); 2393 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; 2394 pc->c[4] = write_filemark; 2395 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2396 pc->callback = &idetape_pc_callback; 2397} 2398 2399static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) 2400{ 2401 idetape_init_pc(pc); 2402 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; 2403 pc->callback = &idetape_pc_callback; 2404} 2405 2406/* 2407 * idetape_queue_pc_tail is based on the following functions: 2408 * 2409 * ide_do_drive_cmd from ide.c 2410 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c 2411 * 2412 * We add a special packet command request to the tail of the request 2413 * queue, and wait for it to be serviced. 2414 * 2415 * This is not to be called from within the request handling part 2416 * of the driver ! We allocate here data in the stack, and it is valid 2417 * until the request is finished. This is not the case for the bottom 2418 * part of the driver, where we are always leaving the functions to wait 2419 * for an interrupt or a timer event. 2420 * 2421 * From the bottom part of the driver, we should allocate safe memory 2422 * using idetape_next_pc_storage and idetape_next_rq_storage, and add 2423 * the request to the request list without waiting for it to be serviced ! 2424 * In that case, we usually use idetape_queue_pc_head. 2425 */ 2426static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) 2427{ 2428 struct ide_tape_obj *tape = drive->driver_data; 2429 struct request rq; 2430 2431 idetape_init_rq(&rq, REQ_IDETAPE_PC1); 2432 rq.buffer = (char *) pc; 2433 rq.rq_disk = tape->disk; 2434 return ide_do_drive_cmd(drive, &rq, ide_wait); 2435} 2436 2437static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) 2438{ 2439 idetape_init_pc(pc); 2440 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; 2441 pc->c[4] = cmd; 2442 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2443 pc->callback = &idetape_pc_callback; 2444} 2445 2446static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 2447{ 2448 idetape_tape_t *tape = drive->driver_data; 2449 idetape_pc_t pc; 2450 int load_attempted = 0; 2451 2452 /* 2453 * Wait for the tape to become ready 2454 */ 2455 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 2456 timeout += jiffies; 2457 while (time_before(jiffies, timeout)) { 2458 idetape_create_test_unit_ready_cmd(&pc); 2459 if (!__idetape_queue_pc_tail(drive, &pc)) 2460 return 0; 2461 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 2462 || (tape->asc == 0x3A)) { /* no media */ 2463 if (load_attempted) 2464 return -ENOMEDIUM; 2465 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 2466 __idetape_queue_pc_tail(drive, &pc); 2467 load_attempted = 1; 2468 /* not about to be ready */ 2469 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 2470 (tape->ascq == 1 || tape->ascq == 8))) 2471 return -EIO; 2472 msleep(100); 2473 } 2474 return -EIO; 2475} 2476 2477static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) 2478{ 2479 return __idetape_queue_pc_tail(drive, pc); 2480} 2481 2482static int idetape_flush_tape_buffers (ide_drive_t *drive) 2483{ 2484 idetape_pc_t pc; 2485 int rc; 2486 2487 idetape_create_write_filemark_cmd(drive, &pc, 0); 2488 if ((rc = idetape_queue_pc_tail(drive, &pc))) 2489 return rc; 2490 idetape_wait_ready(drive, 60 * 5 * HZ); 2491 return 0; 2492} 2493 2494static void idetape_create_read_position_cmd (idetape_pc_t *pc) 2495{ 2496 idetape_init_pc(pc); 2497 pc->c[0] = IDETAPE_READ_POSITION_CMD; 2498 pc->request_transfer = 20; 2499 pc->callback = &idetape_read_position_callback; 2500} 2501 2502static int idetape_read_position (ide_drive_t *drive) 2503{ 2504 idetape_tape_t *tape = drive->driver_data; 2505 idetape_pc_t pc; 2506 int position; 2507 2508#if IDETAPE_DEBUG_LOG 2509 if (tape->debug_level >= 4) 2510 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); 2511#endif /* IDETAPE_DEBUG_LOG */ 2512 2513 idetape_create_read_position_cmd(&pc); 2514 if (idetape_queue_pc_tail(drive, &pc)) 2515 return -1; 2516 position = tape->first_frame_position; 2517 return position; 2518} 2519 2520static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) 2521{ 2522 idetape_init_pc(pc); 2523 pc->c[0] = IDETAPE_LOCATE_CMD; 2524 pc->c[1] = 2; 2525 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); 2526 pc->c[8] = partition; 2527 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2528 pc->callback = &idetape_pc_callback; 2529} 2530 2531static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) 2532{ 2533 idetape_tape_t *tape = drive->driver_data; 2534 2535 if (!tape->capabilities.lock) 2536 return 0; 2537 2538 idetape_init_pc(pc); 2539 pc->c[0] = IDETAPE_PREVENT_CMD; 2540 pc->c[4] = prevent; 2541 pc->callback = &idetape_pc_callback; 2542 return 1; 2543} 2544 2545static int __idetape_discard_read_pipeline (ide_drive_t *drive) 2546{ 2547 idetape_tape_t *tape = drive->driver_data; 2548 unsigned long flags; 2549 int cnt; 2550 2551 if (tape->chrdev_direction != idetape_direction_read) 2552 return 0; 2553 2554 /* Remove merge stage. */ 2555 cnt = tape->merge_stage_size / tape->tape_block_size; 2556 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 2557 ++cnt; /* Filemarks count as 1 sector */ 2558 tape->merge_stage_size = 0; 2559 if (tape->merge_stage != NULL) { 2560 __idetape_kfree_stage(tape->merge_stage); 2561 tape->merge_stage = NULL; 2562 } 2563 2564 /* Clear pipeline flags. */ 2565 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 2566 tape->chrdev_direction = idetape_direction_none; 2567 2568 /* Remove pipeline stages. */ 2569 if (tape->first_stage == NULL) 2570 return 0; 2571 2572 spin_lock_irqsave(&tape->spinlock, flags); 2573 tape->next_stage = NULL; 2574 if (idetape_pipeline_active(tape)) 2575 idetape_wait_for_request(drive, tape->active_data_request); 2576 spin_unlock_irqrestore(&tape->spinlock, flags); 2577 2578 while (tape->first_stage != NULL) { 2579 struct request *rq_ptr = &tape->first_stage->rq; 2580 2581 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; 2582 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 2583 ++cnt; 2584 idetape_remove_stage_head(drive); 2585 } 2586 tape->nr_pending_stages = 0; 2587 tape->max_stages = tape->min_pipeline; 2588 return cnt; 2589} 2590 2591/* 2592 * idetape_position_tape positions the tape to the requested block 2593 * using the LOCATE packet command. A READ POSITION command is then 2594 * issued to check where we are positioned. 2595 * 2596 * Like all higher level operations, we queue the commands at the tail 2597 * of the request queue and wait for their completion. 2598 * 2599 */ 2600static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) 2601{ 2602 idetape_tape_t *tape = drive->driver_data; 2603 int retval; 2604 idetape_pc_t pc; 2605 2606 if (tape->chrdev_direction == idetape_direction_read) 2607 __idetape_discard_read_pipeline(drive); 2608 idetape_wait_ready(drive, 60 * 5 * HZ); 2609 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 2610 retval = idetape_queue_pc_tail(drive, &pc); 2611 if (retval) 2612 return (retval); 2613 2614 idetape_create_read_position_cmd(&pc); 2615 return (idetape_queue_pc_tail(drive, &pc)); 2616} 2617 2618static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) 2619{ 2620 idetape_tape_t *tape = drive->driver_data; 2621 int cnt; 2622 int seek, position; 2623 2624 cnt = __idetape_discard_read_pipeline(drive); 2625 if (restore_position) { 2626 position = idetape_read_position(drive); 2627 seek = position > cnt ? position - cnt : 0; 2628 if (idetape_position_tape(drive, seek, 0, 0)) { 2629 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); 2630 return; 2631 } 2632 } 2633} 2634 2635/* 2636 * idetape_queue_rw_tail generates a read/write request for the block 2637 * device interface and wait for it to be serviced. 2638 */ 2639static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) 2640{ 2641 idetape_tape_t *tape = drive->driver_data; 2642 struct request rq; 2643 2644#if IDETAPE_DEBUG_LOG 2645 if (tape->debug_level >= 2) 2646 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); 2647#endif /* IDETAPE_DEBUG_LOG */ 2648#if IDETAPE_DEBUG_BUGS 2649 if (idetape_pipeline_active(tape)) { 2650 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); 2651 return (0); 2652 } 2653#endif /* IDETAPE_DEBUG_BUGS */ 2654 2655 idetape_init_rq(&rq, cmd); 2656 rq.rq_disk = tape->disk; 2657 rq.special = (void *)bh; 2658 rq.sector = tape->first_frame_position; 2659 rq.nr_sectors = rq.current_nr_sectors = blocks; 2660 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 2661 2662 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) 2663 return 0; 2664 2665 if (tape->merge_stage) 2666 idetape_init_merge_stage(tape); 2667 if (rq.errors == IDETAPE_ERROR_GENERAL) 2668 return -EIO; 2669 return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); 2670} 2671 2672/* 2673 * idetape_insert_pipeline_into_queue is used to start servicing the 2674 * pipeline stages, starting from tape->next_stage. 2675 */ 2676static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) 2677{ 2678 idetape_tape_t *tape = drive->driver_data; 2679 2680 if (tape->next_stage == NULL) 2681 return; 2682 if (!idetape_pipeline_active(tape)) { 2683 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2684 idetape_active_next_stage(drive); 2685 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 2686 } 2687} 2688 2689static void idetape_create_inquiry_cmd (idetape_pc_t *pc) 2690{ 2691 idetape_init_pc(pc); 2692 pc->c[0] = IDETAPE_INQUIRY_CMD; 2693 pc->c[4] = pc->request_transfer = 254; 2694 pc->callback = &idetape_pc_callback; 2695} 2696 2697static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) 2698{ 2699 idetape_init_pc(pc); 2700 pc->c[0] = IDETAPE_REWIND_CMD; 2701 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2702 pc->callback = &idetape_pc_callback; 2703} 2704 2705static void idetape_create_erase_cmd (idetape_pc_t *pc) 2706{ 2707 idetape_init_pc(pc); 2708 pc->c[0] = IDETAPE_ERASE_CMD; 2709 pc->c[1] = 1; 2710 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2711 pc->callback = &idetape_pc_callback; 2712} 2713 2714static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) 2715{ 2716 idetape_init_pc(pc); 2717 pc->c[0] = IDETAPE_SPACE_CMD; 2718 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); 2719 pc->c[1] = cmd; 2720 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2721 pc->callback = &idetape_pc_callback; 2722} 2723 2724static void idetape_wait_first_stage (ide_drive_t *drive) 2725{ 2726 idetape_tape_t *tape = drive->driver_data; 2727 unsigned long flags; 2728 2729 if (tape->first_stage == NULL) 2730 return; 2731 spin_lock_irqsave(&tape->spinlock, flags); 2732 if (tape->active_stage == tape->first_stage) 2733 idetape_wait_for_request(drive, tape->active_data_request); 2734 spin_unlock_irqrestore(&tape->spinlock, flags); 2735} 2736 2737/* 2738 * idetape_add_chrdev_write_request tries to add a character device 2739 * originated write request to our pipeline. In case we don't succeed, 2740 * we revert to non-pipelined operation mode for this request. 2741 * 2742 * 1. Try to allocate a new pipeline stage. 2743 * 2. If we can't, wait for more and more requests to be serviced 2744 * and try again each time. 2745 * 3. If we still can't allocate a stage, fallback to 2746 * non-pipelined operation mode for this request. 2747 */ 2748static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) 2749{ 2750 idetape_tape_t *tape = drive->driver_data; 2751 idetape_stage_t *new_stage; 2752 unsigned long flags; 2753 struct request *rq; 2754 2755#if IDETAPE_DEBUG_LOG 2756 if (tape->debug_level >= 3) 2757 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); 2758#endif /* IDETAPE_DEBUG_LOG */ 2759 2760 /* 2761 * Attempt to allocate a new stage. 2762 * Pay special attention to possible race conditions. 2763 */ 2764 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { 2765 spin_lock_irqsave(&tape->spinlock, flags); 2766 if (idetape_pipeline_active(tape)) { 2767 idetape_wait_for_request(drive, tape->active_data_request); 2768 spin_unlock_irqrestore(&tape->spinlock, flags); 2769 } else { 2770 spin_unlock_irqrestore(&tape->spinlock, flags); 2771 idetape_insert_pipeline_into_queue(drive); 2772 if (idetape_pipeline_active(tape)) 2773 continue; 2774 /* 2775 * Linux is short on memory. Fallback to 2776 * non-pipelined operation mode for this request. 2777 */ 2778 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 2779 } 2780 } 2781 rq = &new_stage->rq; 2782 idetape_init_rq(rq, REQ_IDETAPE_WRITE); 2783 /* Doesn't actually matter - We always assume sequential access */ 2784 rq->sector = tape->first_frame_position; 2785 rq->nr_sectors = rq->current_nr_sectors = blocks; 2786 2787 idetape_switch_buffers(tape, new_stage); 2788 idetape_add_stage_tail(drive, new_stage); 2789 tape->pipeline_head++; 2790 calculate_speeds(drive); 2791 2792 /* 2793 * Estimate whether the tape has stopped writing by checking 2794 * if our write pipeline is currently empty. If we are not 2795 * writing anymore, wait for the pipeline to be full enough 2796 * (90%) before starting to service requests, so that we will 2797 * be able to keep up with the higher speeds of the tape. 2798 */ 2799 if (!idetape_pipeline_active(tape)) { 2800 if (tape->nr_stages >= tape->max_stages * 9 / 10 || 2801 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { 2802 tape->measure_insert_time = 1; 2803 tape->insert_time = jiffies; 2804 tape->insert_size = 0; 2805 tape->insert_speed = 0; 2806 idetape_insert_pipeline_into_queue(drive); 2807 } 2808 } 2809 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 2810 /* Return a deferred error */ 2811 return -EIO; 2812 return blocks; 2813} 2814 2815/* 2816 * idetape_wait_for_pipeline will wait until all pending pipeline 2817 * requests are serviced. Typically called on device close. 2818 */ 2819static void idetape_wait_for_pipeline (ide_drive_t *drive) 2820{ 2821 idetape_tape_t *tape = drive->driver_data; 2822 unsigned long flags; 2823 2824 while (tape->next_stage || idetape_pipeline_active(tape)) { 2825 idetape_insert_pipeline_into_queue(drive); 2826 spin_lock_irqsave(&tape->spinlock, flags); 2827 if (idetape_pipeline_active(tape)) 2828 idetape_wait_for_request(drive, tape->active_data_request); 2829 spin_unlock_irqrestore(&tape->spinlock, flags); 2830 } 2831} 2832 2833static void idetape_empty_write_pipeline (ide_drive_t *drive) 2834{ 2835 idetape_tape_t *tape = drive->driver_data; 2836 int blocks, min; 2837 struct idetape_bh *bh; 2838 2839#if IDETAPE_DEBUG_BUGS 2840 if (tape->chrdev_direction != idetape_direction_write) { 2841 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); 2842 return; 2843 } 2844 if (tape->merge_stage_size > tape->stage_size) { 2845 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 2846 tape->merge_stage_size = tape->stage_size; 2847 } 2848#endif /* IDETAPE_DEBUG_BUGS */ 2849 if (tape->merge_stage_size) { 2850 blocks = tape->merge_stage_size / tape->tape_block_size; 2851 if (tape->merge_stage_size % tape->tape_block_size) { 2852 unsigned int i; 2853 2854 blocks++; 2855 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; 2856 bh = tape->bh->b_reqnext; 2857 while (bh) { 2858 atomic_set(&bh->b_count, 0); 2859 bh = bh->b_reqnext; 2860 } 2861 bh = tape->bh; 2862 while (i) { 2863 if (bh == NULL) { 2864 2865 printk(KERN_INFO "ide-tape: bug, bh NULL\n"); 2866 break; 2867 } 2868 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); 2869 memset(bh->b_data + atomic_read(&bh->b_count), 0, min); 2870 atomic_add(min, &bh->b_count); 2871 i -= min; 2872 bh = bh->b_reqnext; 2873 } 2874 } 2875 (void) idetape_add_chrdev_write_request(drive, blocks); 2876 tape->merge_stage_size = 0; 2877 } 2878 idetape_wait_for_pipeline(drive); 2879 if (tape->merge_stage != NULL) { 2880 __idetape_kfree_stage(tape->merge_stage); 2881 tape->merge_stage = NULL; 2882 } 2883 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 2884 tape->chrdev_direction = idetape_direction_none; 2885 2886 /* 2887 * On the next backup, perform the feedback loop again. 2888 * (I don't want to keep sense information between backups, 2889 * as some systems are constantly on, and the system load 2890 * can be totally different on the next backup). 2891 */ 2892 tape->max_stages = tape->min_pipeline; 2893#if IDETAPE_DEBUG_BUGS 2894 if (tape->first_stage != NULL || 2895 tape->next_stage != NULL || 2896 tape->last_stage != NULL || 2897 tape->nr_stages != 0) { 2898 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " 2899 "first_stage %p, next_stage %p, " 2900 "last_stage %p, nr_stages %d\n", 2901 tape->first_stage, tape->next_stage, 2902 tape->last_stage, tape->nr_stages); 2903 } 2904#endif /* IDETAPE_DEBUG_BUGS */ 2905} 2906 2907static void idetape_restart_speed_control (ide_drive_t *drive) 2908{ 2909 idetape_tape_t *tape = drive->driver_data; 2910 2911 tape->restart_speed_control_req = 0; 2912 tape->pipeline_head = 0; 2913 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; 2914 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; 2915 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; 2916 tape->uncontrolled_pipeline_head_speed = 0; 2917 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; 2918 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; 2919} 2920 2921static int idetape_initiate_read (ide_drive_t *drive, int max_stages) 2922{ 2923 idetape_tape_t *tape = drive->driver_data; 2924 idetape_stage_t *new_stage; 2925 struct request rq; 2926 int bytes_read; 2927 int blocks = tape->capabilities.ctl; 2928 2929 /* Initialize read operation */ 2930 if (tape->chrdev_direction != idetape_direction_read) { 2931 if (tape->chrdev_direction == idetape_direction_write) { 2932 idetape_empty_write_pipeline(drive); 2933 idetape_flush_tape_buffers(drive); 2934 } 2935#if IDETAPE_DEBUG_BUGS 2936 if (tape->merge_stage || tape->merge_stage_size) { 2937 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); 2938 tape->merge_stage_size = 0; 2939 } 2940#endif /* IDETAPE_DEBUG_BUGS */ 2941 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 2942 return -ENOMEM; 2943 tape->chrdev_direction = idetape_direction_read; 2944 2945 /* 2946 * Issue a read 0 command to ensure that DSC handshake 2947 * is switched from completion mode to buffer available 2948 * mode. 2949 * No point in issuing this if DSC overlap isn't supported, 2950 * some drives (Seagate STT3401A) will return an error. 2951 */ 2952 if (drive->dsc_overlap) { 2953 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); 2954 if (bytes_read < 0) { 2955 __idetape_kfree_stage(tape->merge_stage); 2956 tape->merge_stage = NULL; 2957 tape->chrdev_direction = idetape_direction_none; 2958 return bytes_read; 2959 } 2960 } 2961 } 2962 if (tape->restart_speed_control_req) 2963 idetape_restart_speed_control(drive); 2964 idetape_init_rq(&rq, REQ_IDETAPE_READ); 2965 rq.sector = tape->first_frame_position; 2966 rq.nr_sectors = rq.current_nr_sectors = blocks; 2967 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && 2968 tape->nr_stages < max_stages) { 2969 new_stage = idetape_kmalloc_stage(tape); 2970 while (new_stage != NULL) { 2971 new_stage->rq = rq; 2972 idetape_add_stage_tail(drive, new_stage); 2973 if (tape->nr_stages >= max_stages) 2974 break; 2975 new_stage = idetape_kmalloc_stage(tape); 2976 } 2977 } 2978 if (!idetape_pipeline_active(tape)) { 2979 if (tape->nr_pending_stages >= 3 * max_stages / 4) { 2980 tape->measure_insert_time = 1; 2981 tape->insert_time = jiffies; 2982 tape->insert_size = 0; 2983 tape->insert_speed = 0; 2984 idetape_insert_pipeline_into_queue(drive); 2985 } 2986 } 2987 return 0; 2988} 2989 2990/* 2991 * idetape_add_chrdev_read_request is called from idetape_chrdev_read 2992 * to service a character device read request and add read-ahead 2993 * requests to our pipeline. 2994 */ 2995static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) 2996{ 2997 idetape_tape_t *tape = drive->driver_data; 2998 unsigned long flags; 2999 struct request *rq_ptr; 3000 int bytes_read; 3001 3002#if IDETAPE_DEBUG_LOG 3003 if (tape->debug_level >= 4) 3004 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); 3005#endif /* IDETAPE_DEBUG_LOG */ 3006 3007 /* 3008 * If we are at a filemark, return a read length of 0 3009 */ 3010 if (test_bit(IDETAPE_FILEMARK, &tape->flags)) 3011 return 0; 3012 3013 /* 3014 * Wait for the next block to be available at the head 3015 * of the pipeline 3016 */ 3017 idetape_initiate_read(drive, tape->max_stages); 3018 if (tape->first_stage == NULL) { 3019 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 3020 return 0; 3021 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); 3022 } 3023 idetape_wait_first_stage(drive); 3024 rq_ptr = &tape->first_stage->rq; 3025 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); 3026 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; 3027 3028 3029 if (rq_ptr->errors == IDETAPE_ERROR_EOD) 3030 return 0; 3031 else { 3032 idetape_switch_buffers(tape, tape->first_stage); 3033 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 3034 set_bit(IDETAPE_FILEMARK, &tape->flags); 3035 spin_lock_irqsave(&tape->spinlock, flags); 3036 idetape_remove_stage_head(drive); 3037 spin_unlock_irqrestore(&tape->spinlock, flags); 3038 tape->pipeline_head++; 3039 calculate_speeds(drive); 3040 } 3041#if IDETAPE_DEBUG_BUGS 3042 if (bytes_read > blocks * tape->tape_block_size) { 3043 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); 3044 bytes_read = blocks * tape->tape_block_size; 3045 } 3046#endif /* IDETAPE_DEBUG_BUGS */ 3047 return (bytes_read); 3048} 3049 3050static void idetape_pad_zeros (ide_drive_t *drive, int bcount) 3051{ 3052 idetape_tape_t *tape = drive->driver_data; 3053 struct idetape_bh *bh; 3054 int blocks; 3055 3056 while (bcount) { 3057 unsigned int count; 3058 3059 bh = tape->merge_stage->bh; 3060 count = min(tape->stage_size, bcount); 3061 bcount -= count; 3062 blocks = count / tape->tape_block_size; 3063 while (count) { 3064 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); 3065 memset(bh->b_data, 0, atomic_read(&bh->b_count)); 3066 count -= atomic_read(&bh->b_count); 3067 bh = bh->b_reqnext; 3068 } 3069 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 3070 } 3071} 3072 3073static int idetape_pipeline_size (ide_drive_t *drive) 3074{ 3075 idetape_tape_t *tape = drive->driver_data; 3076 idetape_stage_t *stage; 3077 struct request *rq; 3078 int size = 0; 3079 3080 idetape_wait_for_pipeline(drive); 3081 stage = tape->first_stage; 3082 while (stage != NULL) { 3083 rq = &stage->rq; 3084 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); 3085 if (rq->errors == IDETAPE_ERROR_FILEMARK) 3086 size += tape->tape_block_size; 3087 stage = stage->next; 3088 } 3089 size += tape->merge_stage_size; 3090 return size; 3091} 3092 3093/* 3094 * Rewinds the tape to the Beginning Of the current Partition (BOP). 3095 * 3096 * We currently support only one partition. 3097 */ 3098static int idetape_rewind_tape (ide_drive_t *drive) 3099{ 3100 int retval; 3101 idetape_pc_t pc; 3102#if IDETAPE_DEBUG_LOG 3103 idetape_tape_t *tape = drive->driver_data; 3104 if (tape->debug_level >= 2) 3105 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); 3106#endif /* IDETAPE_DEBUG_LOG */ 3107 3108 idetape_create_rewind_cmd(drive, &pc); 3109 retval = idetape_queue_pc_tail(drive, &pc); 3110 if (retval) 3111 return retval; 3112 3113 idetape_create_read_position_cmd(&pc); 3114 retval = idetape_queue_pc_tail(drive, &pc); 3115 if (retval) 3116 return retval; 3117 return 0; 3118} 3119 3120/* 3121 * Our special ide-tape ioctl's. 3122 * 3123 * Currently there aren't any ioctl's. 3124 * mtio.h compatible commands should be issued to the character device 3125 * interface. 3126 */ 3127static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) 3128{ 3129 idetape_tape_t *tape = drive->driver_data; 3130 idetape_config_t config; 3131 void __user *argp = (void __user *)arg; 3132 3133#if IDETAPE_DEBUG_LOG 3134 if (tape->debug_level >= 4) 3135 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); 3136#endif /* IDETAPE_DEBUG_LOG */ 3137 switch (cmd) { 3138 case 0x0340: 3139 if (copy_from_user(&config, argp, sizeof (idetape_config_t))) 3140 return -EFAULT; 3141 tape->best_dsc_rw_frequency = config.dsc_rw_frequency; 3142 tape->max_stages = config.nr_stages; 3143 break; 3144 case 0x0350: 3145 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; 3146 config.nr_stages = tape->max_stages; 3147 if (copy_to_user(argp, &config, sizeof (idetape_config_t))) 3148 return -EFAULT; 3149 break; 3150 default: 3151 return -EIO; 3152 } 3153 return 0; 3154} 3155 3156/* 3157 * idetape_space_over_filemarks is now a bit more complicated than just 3158 * passing the command to the tape since we may have crossed some 3159 * filemarks during our pipelined read-ahead mode. 3160 * 3161 * As a minor side effect, the pipeline enables us to support MTFSFM when 3162 * the filemark is in our internal pipeline even if the tape doesn't 3163 * support spacing over filemarks in the reverse direction. 3164 */ 3165static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) 3166{ 3167 idetape_tape_t *tape = drive->driver_data; 3168 idetape_pc_t pc; 3169 unsigned long flags; 3170 int retval,count=0; 3171 3172 if (mt_count == 0) 3173 return 0; 3174 if (MTBSF == mt_op || MTBSFM == mt_op) { 3175 if (!tape->capabilities.sprev) 3176 return -EIO; 3177 mt_count = - mt_count; 3178 } 3179 3180 if (tape->chrdev_direction == idetape_direction_read) { 3181 /* 3182 * We have a read-ahead buffer. Scan it for crossed 3183 * filemarks. 3184 */ 3185 tape->merge_stage_size = 0; 3186 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 3187 ++count; 3188 while (tape->first_stage != NULL) { 3189 if (count == mt_count) { 3190 if (mt_op == MTFSFM) 3191 set_bit(IDETAPE_FILEMARK, &tape->flags); 3192 return 0; 3193 } 3194 spin_lock_irqsave(&tape->spinlock, flags); 3195 if (tape->first_stage == tape->active_stage) { 3196 /* 3197 * We have reached the active stage in the read pipeline. 3198 * There is no point in allowing the drive to continue 3199 * reading any farther, so we stop the pipeline. 3200 * 3201 * This section should be moved to a separate subroutine, 3202 * because a similar function is performed in 3203 * __idetape_discard_read_pipeline(), for example. 3204 */ 3205 tape->next_stage = NULL; 3206 spin_unlock_irqrestore(&tape->spinlock, flags); 3207 idetape_wait_first_stage(drive); 3208 tape->next_stage = tape->first_stage->next; 3209 } else 3210 spin_unlock_irqrestore(&tape->spinlock, flags); 3211 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) 3212 ++count; 3213 idetape_remove_stage_head(drive); 3214 } 3215 idetape_discard_read_pipeline(drive, 0); 3216 } 3217 3218 /* 3219 * The filemark was not found in our internal pipeline. 3220 * Now we can issue the space command. 3221 */ 3222 switch (mt_op) { 3223 case MTFSF: 3224 case MTBSF: 3225 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); 3226 return (idetape_queue_pc_tail(drive, &pc)); 3227 case MTFSFM: 3228 case MTBSFM: 3229 if (!tape->capabilities.sprev) 3230 return (-EIO); 3231 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); 3232 if (retval) return (retval); 3233 count = (MTBSFM == mt_op ? 1 : -1); 3234 return (idetape_space_over_filemarks(drive, MTFSF, count)); 3235 default: 3236 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); 3237 return (-EIO); 3238 } 3239} 3240 3241 3242/* 3243 * Our character device read / write functions. 3244 * 3245 * The tape is optimized to maximize throughput when it is transferring 3246 * an integral number of the "continuous transfer limit", which is 3247 * a parameter of the specific tape (26 KB on my particular tape). 3248 * (32 kB for Onstream) 3249 * 3250 * As of version 1.3 of the driver, the character device provides an 3251 * abstract continuous view of the media - any mix of block sizes (even 1 3252 * byte) on the same backup/restore procedure is supported. The driver 3253 * will internally convert the requests to the recommended transfer unit, 3254 * so that an unmatch between the user's block size to the recommended 3255 * size will only result in a (slightly) increased driver overhead, but 3256 * will no longer hit performance. 3257 * This is not applicable to Onstream. 3258 */ 3259static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, 3260 size_t count, loff_t *ppos) 3261{ 3262 struct ide_tape_obj *tape = ide_tape_f(file); 3263 ide_drive_t *drive = tape->drive; 3264 ssize_t bytes_read,temp, actually_read = 0, rc; 3265 ssize_t ret = 0; 3266 3267#if IDETAPE_DEBUG_LOG 3268 if (tape->debug_level >= 3) 3269 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); 3270#endif /* IDETAPE_DEBUG_LOG */ 3271 3272 if (tape->chrdev_direction != idetape_direction_read) { 3273 if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) 3274 if (count > tape->tape_block_size && 3275 (count % tape->tape_block_size) == 0) 3276 tape->user_bs_factor = count / tape->tape_block_size; 3277 } 3278 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) 3279 return rc; 3280 if (count == 0) 3281 return (0); 3282 if (tape->merge_stage_size) { 3283 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); 3284 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read)) 3285 ret = -EFAULT; 3286 buf += actually_read; 3287 tape->merge_stage_size -= actually_read; 3288 count -= actually_read; 3289 } 3290 while (count >= tape->stage_size) { 3291 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); 3292 if (bytes_read <= 0) 3293 goto finish; 3294 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read)) 3295 ret = -EFAULT; 3296 buf += bytes_read; 3297 count -= bytes_read; 3298 actually_read += bytes_read; 3299 } 3300 if (count) { 3301 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); 3302 if (bytes_read <= 0) 3303 goto finish; 3304 temp = min((unsigned long)count, (unsigned long)bytes_read); 3305 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp)) 3306 ret = -EFAULT; 3307 actually_read += temp; 3308 tape->merge_stage_size = bytes_read-temp; 3309 } 3310finish: 3311 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { 3312#if IDETAPE_DEBUG_LOG 3313 if (tape->debug_level >= 2) 3314 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); 3315#endif 3316 idetape_space_over_filemarks(drive, MTFSF, 1); 3317 return 0; 3318 } 3319 3320 return (ret) ? ret : actually_read; 3321} 3322 3323static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, 3324 size_t count, loff_t *ppos) 3325{ 3326 struct ide_tape_obj *tape = ide_tape_f(file); 3327 ide_drive_t *drive = tape->drive; 3328 ssize_t actually_written = 0; 3329 ssize_t ret = 0; 3330 3331 /* The drive is write protected. */ 3332 if (tape->write_prot) 3333 return -EACCES; 3334 3335#if IDETAPE_DEBUG_LOG 3336 if (tape->debug_level >= 3) 3337 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " 3338 "count %Zd\n", count); 3339#endif /* IDETAPE_DEBUG_LOG */ 3340 3341 /* Initialize write operation */ 3342 if (tape->chrdev_direction != idetape_direction_write) { 3343 if (tape->chrdev_direction == idetape_direction_read) 3344 idetape_discard_read_pipeline(drive, 1); 3345#if IDETAPE_DEBUG_BUGS 3346 if (tape->merge_stage || tape->merge_stage_size) { 3347 printk(KERN_ERR "ide-tape: merge_stage_size " 3348 "should be 0 now\n"); 3349 tape->merge_stage_size = 0; 3350 } 3351#endif /* IDETAPE_DEBUG_BUGS */ 3352 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 3353 return -ENOMEM; 3354 tape->chrdev_direction = idetape_direction_write; 3355 idetape_init_merge_stage(tape); 3356 3357 /* 3358 * Issue a write 0 command to ensure that DSC handshake 3359 * is switched from completion mode to buffer available 3360 * mode. 3361 * No point in issuing this if DSC overlap isn't supported, 3362 * some drives (Seagate STT3401A) will return an error. 3363 */ 3364 if (drive->dsc_overlap) { 3365 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); 3366 if (retval < 0) { 3367 __idetape_kfree_stage(tape->merge_stage); 3368 tape->merge_stage = NULL; 3369 tape->chrdev_direction = idetape_direction_none; 3370 return retval; 3371 } 3372 } 3373 } 3374 if (count == 0) 3375 return (0); 3376 if (tape->restart_speed_control_req) 3377 idetape_restart_speed_control(drive); 3378 if (tape->merge_stage_size) { 3379#if IDETAPE_DEBUG_BUGS 3380 if (tape->merge_stage_size >= tape->stage_size) { 3381 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); 3382 tape->merge_stage_size = 0; 3383 } 3384#endif /* IDETAPE_DEBUG_BUGS */ 3385 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); 3386 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written)) 3387 ret = -EFAULT; 3388 buf += actually_written; 3389 tape->merge_stage_size += actually_written; 3390 count -= actually_written; 3391 3392 if (tape->merge_stage_size == tape->stage_size) { 3393 ssize_t retval; 3394 tape->merge_stage_size = 0; 3395 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); 3396 if (retval <= 0) 3397 return (retval); 3398 } 3399 } 3400 while (count >= tape->stage_size) { 3401 ssize_t retval; 3402 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size)) 3403 ret = -EFAULT; 3404 buf += tape->stage_size; 3405 count -= tape->stage_size; 3406 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); 3407 actually_written += tape->stage_size; 3408 if (retval <= 0) 3409 return (retval); 3410 } 3411 if (count) { 3412 actually_written += count; 3413 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count)) 3414 ret = -EFAULT; 3415 tape->merge_stage_size += count; 3416 } 3417 return (ret) ? ret : actually_written; 3418} 3419 3420static int idetape_write_filemark (ide_drive_t *drive) 3421{ 3422 idetape_pc_t pc; 3423 3424 /* Write a filemark */ 3425 idetape_create_write_filemark_cmd(drive, &pc, 1); 3426 if (idetape_queue_pc_tail(drive, &pc)) { 3427 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 3428 return -EIO; 3429 } 3430 return 0; 3431} 3432 3433/* 3434 * idetape_mtioctop is called from idetape_chrdev_ioctl when 3435 * the general mtio MTIOCTOP ioctl is requested. 3436 * 3437 * We currently support the following mtio.h operations: 3438 * 3439 * MTFSF - Space over mt_count filemarks in the positive direction. 3440 * The tape is positioned after the last spaced filemark. 3441 * 3442 * MTFSFM - Same as MTFSF, but the tape is positioned before the 3443 * last filemark. 3444 * 3445 * MTBSF - Steps background over mt_count filemarks, tape is 3446 * positioned before the last filemark. 3447 * 3448 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. 3449 * 3450 * Note: 3451 * 3452 * MTBSF and MTBSFM are not supported when the tape doesn't 3453 * support spacing over filemarks in the reverse direction. 3454 * In this case, MTFSFM is also usually not supported (it is 3455 * supported in the rare case in which we crossed the filemark 3456 * during our read-ahead pipelined operation mode). 3457 * 3458 * MTWEOF - Writes mt_count filemarks. Tape is positioned after 3459 * the last written filemark. 3460 * 3461 * MTREW - Rewinds tape. 3462 * 3463 * MTLOAD - Loads the tape. 3464 * 3465 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and 3466 * MTUNLOAD prevents further access until the media is replaced. 3467 * 3468 * MTNOP - Flushes tape buffers. 3469 * 3470 * MTRETEN - Retension media. This typically consists of one end 3471 * to end pass on the media. 3472 * 3473 * MTEOM - Moves to the end of recorded data. 3474 * 3475 * MTERASE - Erases tape. 3476 * 3477 * MTSETBLK - Sets the user block size to mt_count bytes. If 3478 * mt_count is 0, we will attempt to autodetect 3479 * the block size. 3480 * 3481 * MTSEEK - Positions the tape in a specific block number, where 3482 * each block is assumed to contain which user_block_size 3483 * bytes. 3484 * 3485 * MTSETPART - Switches to another tape partition. 3486 * 3487 * MTLOCK - Locks the tape door. 3488 * 3489 * MTUNLOCK - Unlocks the tape door. 3490 * 3491 * The following commands are currently not supported: 3492 * 3493 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, 3494 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. 3495 */ 3496static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) 3497{ 3498 idetape_tape_t *tape = drive->driver_data; 3499 idetape_pc_t pc; 3500 int i,retval; 3501 3502#if IDETAPE_DEBUG_LOG 3503 if (tape->debug_level >= 1) 3504 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " 3505 "mt_op=%d, mt_count=%d\n", mt_op, mt_count); 3506#endif /* IDETAPE_DEBUG_LOG */ 3507 /* 3508 * Commands which need our pipelined read-ahead stages. 3509 */ 3510 switch (mt_op) { 3511 case MTFSF: 3512 case MTFSFM: 3513 case MTBSF: 3514 case MTBSFM: 3515 if (!mt_count) 3516 return (0); 3517 return (idetape_space_over_filemarks(drive,mt_op,mt_count)); 3518 default: 3519 break; 3520 } 3521 switch (mt_op) { 3522 case MTWEOF: 3523 if (tape->write_prot) 3524 return -EACCES; 3525 idetape_discard_read_pipeline(drive, 1); 3526 for (i = 0; i < mt_count; i++) { 3527 retval = idetape_write_filemark(drive); 3528 if (retval) 3529 return retval; 3530 } 3531 return (0); 3532 case MTREW: 3533 idetape_discard_read_pipeline(drive, 0); 3534 if (idetape_rewind_tape(drive)) 3535 return -EIO; 3536 return 0; 3537 case MTLOAD: 3538 idetape_discard_read_pipeline(drive, 0); 3539 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 3540 return (idetape_queue_pc_tail(drive, &pc)); 3541 case MTUNLOAD: 3542 case MTOFFL: 3543 /* 3544 * If door is locked, attempt to unlock before 3545 * attempting to eject. 3546 */ 3547 if (tape->door_locked) { 3548 if (idetape_create_prevent_cmd(drive, &pc, 0)) 3549 if (!idetape_queue_pc_tail(drive, &pc)) 3550 tape->door_locked = DOOR_UNLOCKED; 3551 } 3552 idetape_discard_read_pipeline(drive, 0); 3553 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); 3554 retval = idetape_queue_pc_tail(drive, &pc); 3555 if (!retval) 3556 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 3557 return retval; 3558 case MTNOP: 3559 idetape_discard_read_pipeline(drive, 0); 3560 return (idetape_flush_tape_buffers(drive)); 3561 case MTRETEN: 3562 idetape_discard_read_pipeline(drive, 0); 3563 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 3564 return (idetape_queue_pc_tail(drive, &pc)); 3565 case MTEOM: 3566 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 3567 return (idetape_queue_pc_tail(drive, &pc)); 3568 case MTERASE: 3569 (void) idetape_rewind_tape(drive); 3570 idetape_create_erase_cmd(&pc); 3571 return (idetape_queue_pc_tail(drive, &pc)); 3572 case MTSETBLK: 3573 if (mt_count) { 3574 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) 3575 return -EIO; 3576 tape->user_bs_factor = mt_count / tape->tape_block_size; 3577 clear_bit(IDETAPE_DETECT_BS, &tape->flags); 3578 } else 3579 set_bit(IDETAPE_DETECT_BS, &tape->flags); 3580 return 0; 3581 case MTSEEK: 3582 idetape_discard_read_pipeline(drive, 0); 3583 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); 3584 case MTSETPART: 3585 idetape_discard_read_pipeline(drive, 0); 3586 return (idetape_position_tape(drive, 0, mt_count, 0)); 3587 case MTFSR: 3588 case MTBSR: 3589 case MTLOCK: 3590 if (!idetape_create_prevent_cmd(drive, &pc, 1)) 3591 return 0; 3592 retval = idetape_queue_pc_tail(drive, &pc); 3593 if (retval) return retval; 3594 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 3595 return 0; 3596 case MTUNLOCK: 3597 if (!idetape_create_prevent_cmd(drive, &pc, 0)) 3598 return 0; 3599 retval = idetape_queue_pc_tail(drive, &pc); 3600 if (retval) return retval; 3601 tape->door_locked = DOOR_UNLOCKED; 3602 return 0; 3603 default: 3604 printk(KERN_ERR "ide-tape: MTIO operation %d not " 3605 "supported\n", mt_op); 3606 return (-EIO); 3607 } 3608} 3609 3610/* 3611 * Our character device ioctls. 3612 * 3613 * General mtio.h magnetic io commands are supported here, and not in 3614 * the corresponding block interface. 3615 * 3616 * The following ioctls are supported: 3617 * 3618 * MTIOCTOP - Refer to idetape_mtioctop for detailed description. 3619 * 3620 * MTIOCGET - The mt_dsreg field in the returned mtget structure 3621 * will be set to (user block size in bytes << 3622 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. 3623 * 3624 * The mt_blkno is set to the current user block number. 3625 * The other mtget fields are not supported. 3626 * 3627 * MTIOCPOS - The current tape "block position" is returned. We 3628 * assume that each block contains user_block_size 3629 * bytes. 3630 * 3631 * Our own ide-tape ioctls are supported on both interfaces. 3632 */ 3633static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 3634{ 3635 struct ide_tape_obj *tape = ide_tape_f(file); 3636 ide_drive_t *drive = tape->drive; 3637 struct mtop mtop; 3638 struct mtget mtget; 3639 struct mtpos mtpos; 3640 int block_offset = 0, position = tape->first_frame_position; 3641 void __user *argp = (void __user *)arg; 3642 3643#if IDETAPE_DEBUG_LOG 3644 if (tape->debug_level >= 3) 3645 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " 3646 "cmd=%u\n", cmd); 3647#endif /* IDETAPE_DEBUG_LOG */ 3648 3649 tape->restart_speed_control_req = 1; 3650 if (tape->chrdev_direction == idetape_direction_write) { 3651 idetape_empty_write_pipeline(drive); 3652 idetape_flush_tape_buffers(drive); 3653 } 3654 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 3655 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); 3656 if ((position = idetape_read_position(drive)) < 0) 3657 return -EIO; 3658 } 3659 switch (cmd) { 3660 case MTIOCTOP: 3661 if (copy_from_user(&mtop, argp, sizeof (struct mtop))) 3662 return -EFAULT; 3663 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); 3664 case MTIOCGET: 3665 memset(&mtget, 0, sizeof (struct mtget)); 3666 mtget.mt_type = MT_ISSCSI2; 3667 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 3668 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 3669 if (tape->drv_write_prot) { 3670 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 3671 } 3672 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 3673 return -EFAULT; 3674 return 0; 3675 case MTIOCPOS: 3676 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 3677 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 3678 return -EFAULT; 3679 return 0; 3680 default: 3681 if (tape->chrdev_direction == idetape_direction_read) 3682 idetape_discard_read_pipeline(drive, 1); 3683 return idetape_blkdev_ioctl(drive, cmd, arg); 3684 } 3685} 3686 3687static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); 3688 3689/* 3690 * Our character device open function. 3691 */ 3692static int idetape_chrdev_open (struct inode *inode, struct file *filp) 3693{ 3694 unsigned int minor = iminor(inode), i = minor & ~0xc0; 3695 ide_drive_t *drive; 3696 idetape_tape_t *tape; 3697 idetape_pc_t pc; 3698 int retval; 3699 3700 /* 3701 * We really want to do nonseekable_open(inode, filp); here, but some 3702 * versions of tar incorrectly call lseek on tapes and bail out if that 3703 * fails. So we disallow pread() and pwrite(), but permit lseeks. 3704 */ 3705 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 3706 3707#if IDETAPE_DEBUG_LOG 3708 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); 3709#endif /* IDETAPE_DEBUG_LOG */ 3710 3711 if (i >= MAX_HWIFS * MAX_DRIVES) 3712 return -ENXIO; 3713 3714 if (!(tape = ide_tape_chrdev_get(i))) 3715 return -ENXIO; 3716 3717 drive = tape->drive; 3718 3719 filp->private_data = tape; 3720 3721 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { 3722 retval = -EBUSY; 3723 goto out_put_tape; 3724 } 3725 3726 retval = idetape_wait_ready(drive, 60 * HZ); 3727 if (retval) { 3728 clear_bit(IDETAPE_BUSY, &tape->flags); 3729 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 3730 goto out_put_tape; 3731 } 3732 3733 idetape_read_position(drive); 3734 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) 3735 (void)idetape_rewind_tape(drive); 3736 3737 if (tape->chrdev_direction != idetape_direction_read) 3738 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 3739 3740 /* Read block size and write protect status from drive. */ 3741 idetape_get_blocksize_from_block_descriptor(drive); 3742 3743 /* Set write protect flag if device is opened as read-only. */ 3744 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 3745 tape->write_prot = 1; 3746 else 3747 tape->write_prot = tape->drv_write_prot; 3748 3749 /* Make sure drive isn't write protected if user wants to write. */ 3750 if (tape->write_prot) { 3751 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 3752 (filp->f_flags & O_ACCMODE) == O_RDWR) { 3753 clear_bit(IDETAPE_BUSY, &tape->flags); 3754 retval = -EROFS; 3755 goto out_put_tape; 3756 } 3757 } 3758 3759 /* 3760 * Lock the tape drive door so user can't eject. 3761 */ 3762 if (tape->chrdev_direction == idetape_direction_none) { 3763 if (idetape_create_prevent_cmd(drive, &pc, 1)) { 3764 if (!idetape_queue_pc_tail(drive, &pc)) { 3765 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 3766 tape->door_locked = DOOR_LOCKED; 3767 } 3768 } 3769 } 3770 idetape_restart_speed_control(drive); 3771 tape->restart_speed_control_req = 0; 3772 return 0; 3773 3774out_put_tape: 3775 ide_tape_put(tape); 3776 return retval; 3777} 3778 3779static void idetape_write_release (ide_drive_t *drive, unsigned int minor) 3780{ 3781 idetape_tape_t *tape = drive->driver_data; 3782 3783 idetape_empty_write_pipeline(drive); 3784 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); 3785 if (tape->merge_stage != NULL) { 3786 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); 3787 __idetape_kfree_stage(tape->merge_stage); 3788 tape->merge_stage = NULL; 3789 } 3790 idetape_write_filemark(drive); 3791 idetape_flush_tape_buffers(drive); 3792 idetape_flush_tape_buffers(drive); 3793} 3794 3795/* 3796 * Our character device release function. 3797 */ 3798static int idetape_chrdev_release (struct inode *inode, struct file *filp) 3799{ 3800 struct ide_tape_obj *tape = ide_tape_f(filp); 3801 ide_drive_t *drive = tape->drive; 3802 idetape_pc_t pc; 3803 unsigned int minor = iminor(inode); 3804 3805 lock_kernel(); 3806 tape = drive->driver_data; 3807#if IDETAPE_DEBUG_LOG 3808 if (tape->debug_level >= 3) 3809 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); 3810#endif /* IDETAPE_DEBUG_LOG */ 3811 3812 if (tape->chrdev_direction == idetape_direction_write) 3813 idetape_write_release(drive, minor); 3814 if (tape->chrdev_direction == idetape_direction_read) { 3815 if (minor < 128) 3816 idetape_discard_read_pipeline(drive, 1); 3817 else 3818 idetape_wait_for_pipeline(drive); 3819 } 3820 if (tape->cache_stage != NULL) { 3821 __idetape_kfree_stage(tape->cache_stage); 3822 tape->cache_stage = NULL; 3823 } 3824 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) 3825 (void) idetape_rewind_tape(drive); 3826 if (tape->chrdev_direction == idetape_direction_none) { 3827 if (tape->door_locked == DOOR_LOCKED) { 3828 if (idetape_create_prevent_cmd(drive, &pc, 0)) { 3829 if (!idetape_queue_pc_tail(drive, &pc)) 3830 tape->door_locked = DOOR_UNLOCKED; 3831 } 3832 } 3833 } 3834 clear_bit(IDETAPE_BUSY, &tape->flags); 3835 ide_tape_put(tape); 3836 unlock_kernel(); 3837 return 0; 3838} 3839 3840/* 3841 * idetape_identify_device is called to check the contents of the 3842 * ATAPI IDENTIFY command results. We return: 3843 * 3844 * 1 If the tape can be supported by us, based on the information 3845 * we have so far. 3846 * 3847 * 0 If this tape driver is not currently supported by us. 3848 */ 3849static int idetape_identify_device (ide_drive_t *drive) 3850{ 3851 struct idetape_id_gcw gcw; 3852 struct hd_driveid *id = drive->id; 3853 3854 if (drive->id_read == 0) 3855 return 1; 3856 3857 *((unsigned short *) &gcw) = id->config; 3858 3859#if IDETAPE_DEBUG_INFO 3860 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); 3861 printk(KERN_INFO "ide-tape: Protocol Type: "); 3862 switch (gcw.protocol) { 3863 case 0: case 1: printk("ATA\n");break; 3864 case 2: printk("ATAPI\n");break; 3865 case 3: printk("Reserved (Unknown to ide-tape)\n");break; 3866 } 3867 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); 3868 switch (gcw.device_type) { 3869 case 0: printk("Direct-access Device\n");break; 3870 case 1: printk("Streaming Tape Device\n");break; 3871 case 2: case 3: case 4: printk("Reserved\n");break; 3872 case 5: printk("CD-ROM Device\n");break; 3873 case 6: printk("Reserved\n"); 3874 case 7: printk("Optical memory Device\n");break; 3875 case 0x1f: printk("Unknown or no Device type\n");break; 3876 default: printk("Reserved\n"); 3877 } 3878 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); 3879 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); 3880 switch (gcw.drq_type) { 3881 case 0: printk("Microprocessor DRQ\n");break; 3882 case 1: printk("Interrupt DRQ\n");break; 3883 case 2: printk("Accelerated DRQ\n");break; 3884 case 3: printk("Reserved\n");break; 3885 } 3886 printk(KERN_INFO "ide-tape: Command Packet Size: "); 3887 switch (gcw.packet_size) { 3888 case 0: printk("12 bytes\n");break; 3889 case 1: printk("16 bytes\n");break; 3890 default: printk("Reserved\n");break; 3891 } 3892#endif /* IDETAPE_DEBUG_INFO */ 3893 3894 /* Check that we can support this device */ 3895 3896 if (gcw.protocol !=2 ) 3897 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); 3898 else if (gcw.device_type != 1) 3899 printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); 3900 else if (!gcw.removable) 3901 printk(KERN_ERR "ide-tape: The removable flag is not set\n"); 3902 else if (gcw.packet_size != 0) { 3903 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); 3904 if (gcw.packet_size == 1) 3905 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); 3906 } else 3907 return 1; 3908 return 0; 3909} 3910 3911/* 3912 * Use INQUIRY to get the firmware revision 3913 */ 3914static void idetape_get_inquiry_results (ide_drive_t *drive) 3915{ 3916 char *r; 3917 idetape_tape_t *tape = drive->driver_data; 3918 idetape_pc_t pc; 3919 idetape_inquiry_result_t *inquiry; 3920 3921 idetape_create_inquiry_cmd(&pc); 3922 if (idetape_queue_pc_tail(drive, &pc)) { 3923 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); 3924 return; 3925 } 3926 inquiry = (idetape_inquiry_result_t *) pc.buffer; 3927 memcpy(tape->vendor_id, inquiry->vendor_id, 8); 3928 memcpy(tape->product_id, inquiry->product_id, 16); 3929 memcpy(tape->firmware_revision, inquiry->revision_level, 4); 3930 ide_fixstring(tape->vendor_id, 10, 0); 3931 ide_fixstring(tape->product_id, 18, 0); 3932 ide_fixstring(tape->firmware_revision, 6, 0); 3933 r = tape->firmware_revision; 3934 if (*(r + 1) == '.') 3935 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; 3936 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); 3937} 3938 3939/* 3940 * idetape_get_mode_sense_results asks the tape about its various 3941 * parameters. In particular, we will adjust our data transfer buffer 3942 * size to the recommended value as returned by the tape. 3943 */ 3944static void idetape_get_mode_sense_results (ide_drive_t *drive) 3945{ 3946 idetape_tape_t *tape = drive->driver_data; 3947 idetape_pc_t pc; 3948 idetape_mode_parameter_header_t *header; 3949 idetape_capabilities_page_t *capabilities; 3950 3951 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 3952 if (idetape_queue_pc_tail(drive, &pc)) { 3953 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); 3954 tape->tape_block_size = 512; 3955 tape->capabilities.ctl = 52; 3956 tape->capabilities.speed = 450; 3957 tape->capabilities.buffer_size = 6 * 52; 3958 return; 3959 } 3960 header = (idetape_mode_parameter_header_t *) pc.buffer; 3961 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); 3962 3963 capabilities->max_speed = ntohs(capabilities->max_speed); 3964 capabilities->ctl = ntohs(capabilities->ctl); 3965 capabilities->speed = ntohs(capabilities->speed); 3966 capabilities->buffer_size = ntohs(capabilities->buffer_size); 3967 3968 if (!capabilities->speed) { 3969 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); 3970 capabilities->speed = 650; 3971 } 3972 if (!capabilities->max_speed) { 3973 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); 3974 capabilities->max_speed = 650; 3975 } 3976 3977 tape->capabilities = *capabilities; /* Save us a copy */ 3978 if (capabilities->blk512) 3979 tape->tape_block_size = 512; 3980 else if (capabilities->blk1024) 3981 tape->tape_block_size = 1024; 3982 3983#if IDETAPE_DEBUG_INFO 3984 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); 3985 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); 3986 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); 3987 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); 3988 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); 3989 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); 3990 3991 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); 3992 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); 3993 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); 3994 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); 3995 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); 3996 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); 3997 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); 3998 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); 3999 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); 4000 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); 4001 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); 4002 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); 4003 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); 4004 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); 4005 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); 4006 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); 4007 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); 4008 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); 4009 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); 4010 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); 4011#endif /* IDETAPE_DEBUG_INFO */ 4012} 4013 4014/* 4015 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor 4016 * and if it succeeds sets the tape block size with the reported value 4017 */ 4018static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) 4019{ 4020 4021 idetape_tape_t *tape = drive->driver_data; 4022 idetape_pc_t pc; 4023 idetape_mode_parameter_header_t *header; 4024 idetape_parameter_block_descriptor_t *block_descrp; 4025 4026 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 4027 if (idetape_queue_pc_tail(drive, &pc)) { 4028 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 4029 if (tape->tape_block_size == 0) { 4030 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); 4031 tape->tape_block_size = 32768; 4032 } 4033 return; 4034 } 4035 header = (idetape_mode_parameter_header_t *) pc.buffer; 4036 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); 4037 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; 4038 tape->drv_write_prot = (header->dsp & 0x80) >> 7; 4039 4040#if IDETAPE_DEBUG_INFO 4041 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); 4042#endif /* IDETAPE_DEBUG_INFO */ 4043} 4044 4045#ifdef CONFIG_IDE_PROC_FS 4046static void idetape_add_settings (ide_drive_t *drive) 4047{ 4048 idetape_tape_t *tape = drive->driver_data; 4049 4050/* 4051 * drive setting name read/write data type min max mul_factor div_factor data pointer set function 4052 */ 4053 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); 4054 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); 4055 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); 4056 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); 4057 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); 4058 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); 4059 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); 4060 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); 4061 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); 4062 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); 4063 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); 4064 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL); 4065 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); 4066 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); 4067} 4068#else 4069static inline void idetape_add_settings(ide_drive_t *drive) { ; } 4070#endif 4071 4072/* 4073 * ide_setup is called to: 4074 * 4075 * 1. Initialize our various state variables. 4076 * 2. Ask the tape for its capabilities. 4077 * 3. Allocate a buffer which will be used for data 4078 * transfer. The buffer size is chosen based on 4079 * the recommendation which we received in step (2). 4080 * 4081 * Note that at this point ide.c already assigned us an irq, so that 4082 * we can queue requests here and wait for their completion. 4083 */ 4084static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) 4085{ 4086 unsigned long t1, tmid, tn, t; 4087 int speed; 4088 struct idetape_id_gcw gcw; 4089 int stage_size; 4090 struct sysinfo si; 4091 4092 spin_lock_init(&tape->spinlock); 4093 drive->dsc_overlap = 1; 4094 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 4095 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 4096 tape->name); 4097 drive->dsc_overlap = 0; 4098 } 4099 /* Seagate Travan drives do not support DSC overlap. */ 4100 if (strstr(drive->id->model, "Seagate STT3401")) 4101 drive->dsc_overlap = 0; 4102 tape->minor = minor; 4103 tape->name[0] = 'h'; 4104 tape->name[1] = 't'; 4105 tape->name[2] = '0' + minor; 4106 tape->chrdev_direction = idetape_direction_none; 4107 tape->pc = tape->pc_stack; 4108 tape->max_insert_speed = 10000; 4109 tape->speed_control = 1; 4110 *((unsigned short *) &gcw) = drive->id->config; 4111 if (gcw.drq_type == 1) 4112 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); 4113 4114 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; 4115 4116 idetape_get_inquiry_results(drive); 4117 idetape_get_mode_sense_results(drive); 4118 idetape_get_blocksize_from_block_descriptor(drive); 4119 tape->user_bs_factor = 1; 4120 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 4121 while (tape->stage_size > 0xffff) { 4122 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 4123 tape->capabilities.ctl /= 2; 4124 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 4125 } 4126 stage_size = tape->stage_size; 4127 tape->pages_per_stage = stage_size / PAGE_SIZE; 4128 if (stage_size % PAGE_SIZE) { 4129 tape->pages_per_stage++; 4130 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; 4131 } 4132 4133 /* 4134 * Select the "best" DSC read/write polling frequency 4135 * and pipeline size. 4136 */ 4137 speed = max(tape->capabilities.speed, tape->capabilities.max_speed); 4138 4139 tape->max_stages = speed * 1000 * 10 / tape->stage_size; 4140 4141 /* 4142 * Limit memory use for pipeline to 10% of physical memory 4143 */ 4144 si_meminfo(&si); 4145 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) 4146 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); 4147 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); 4148 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); 4149 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); 4150 if (tape->max_stages == 0) 4151 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; 4152 4153 t1 = (tape->stage_size * HZ) / (speed * 1000); 4154 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); 4155 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); 4156 4157 if (tape->max_stages) 4158 t = tn; 4159 else 4160 t = t1; 4161 4162 /* 4163 * Ensure that the number we got makes sense; limit 4164 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 4165 */ 4166 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); 4167 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 4168 "%dkB pipeline, %lums tDSC%s\n", 4169 drive->name, tape->name, tape->capabilities.speed, 4170 (tape->capabilities.buffer_size * 512) / tape->stage_size, 4171 tape->stage_size / 1024, 4172 tape->max_stages * tape->stage_size / 1024, 4173 tape->best_dsc_rw_frequency * 1000 / HZ, 4174 drive->using_dma ? ", DMA":""); 4175 4176 idetape_add_settings(drive); 4177} 4178 4179static void ide_tape_remove(ide_drive_t *drive) 4180{ 4181 idetape_tape_t *tape = drive->driver_data; 4182 4183 ide_proc_unregister_driver(drive, tape->driver); 4184 4185 ide_unregister_region(tape->disk); 4186 4187 ide_tape_put(tape); 4188} 4189 4190static void ide_tape_release(struct kref *kref) 4191{ 4192 struct ide_tape_obj *tape = to_ide_tape(kref); 4193 ide_drive_t *drive = tape->drive; 4194 struct gendisk *g = tape->disk; 4195 4196 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); 4197 4198 drive->dsc_overlap = 0; 4199 drive->driver_data = NULL; 4200 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 4201 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 4202 idetape_devs[tape->minor] = NULL; 4203 g->private_data = NULL; 4204 put_disk(g); 4205 kfree(tape); 4206} 4207 4208#ifdef CONFIG_IDE_PROC_FS 4209static int proc_idetape_read_name 4210 (char *page, char **start, off_t off, int count, int *eof, void *data) 4211{ 4212 ide_drive_t *drive = (ide_drive_t *) data; 4213 idetape_tape_t *tape = drive->driver_data; 4214 char *out = page; 4215 int len; 4216 4217 len = sprintf(out, "%s\n", tape->name); 4218 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 4219} 4220 4221static ide_proc_entry_t idetape_proc[] = { 4222 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 4223 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 4224 { NULL, 0, NULL, NULL } 4225}; 4226#endif 4227 4228static int ide_tape_probe(ide_drive_t *); 4229 4230static ide_driver_t idetape_driver = { 4231 .gen_driver = { 4232 .owner = THIS_MODULE, 4233 .name = "ide-tape", 4234 .bus = &ide_bus_type, 4235 }, 4236 .probe = ide_tape_probe, 4237 .remove = ide_tape_remove, 4238 .version = IDETAPE_VERSION, 4239 .media = ide_tape, 4240 .supports_dsc_overlap = 1, 4241 .do_request = idetape_do_request, 4242 .end_request = idetape_end_request, 4243 .error = __ide_error, 4244 .abort = __ide_abort, 4245#ifdef CONFIG_IDE_PROC_FS 4246 .proc = idetape_proc, 4247#endif 4248}; 4249 4250/* 4251 * Our character device supporting functions, passed to register_chrdev. 4252 */ 4253static const struct file_operations idetape_fops = { 4254 .owner = THIS_MODULE, 4255 .read = idetape_chrdev_read, 4256 .write = idetape_chrdev_write, 4257 .ioctl = idetape_chrdev_ioctl, 4258 .open = idetape_chrdev_open, 4259 .release = idetape_chrdev_release, 4260}; 4261 4262static int idetape_open(struct inode *inode, struct file *filp) 4263{ 4264 struct gendisk *disk = inode->i_bdev->bd_disk; 4265 struct ide_tape_obj *tape; 4266 4267 if (!(tape = ide_tape_get(disk))) 4268 return -ENXIO; 4269 4270 return 0; 4271} 4272 4273static int idetape_release(struct inode *inode, struct file *filp) 4274{ 4275 struct gendisk *disk = inode->i_bdev->bd_disk; 4276 struct ide_tape_obj *tape = ide_tape_g(disk); 4277 4278 ide_tape_put(tape); 4279 4280 return 0; 4281} 4282 4283static int idetape_ioctl(struct inode *inode, struct file *file, 4284 unsigned int cmd, unsigned long arg) 4285{ 4286 struct block_device *bdev = inode->i_bdev; 4287 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); 4288 ide_drive_t *drive = tape->drive; 4289 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 4290 if (err == -EINVAL) 4291 err = idetape_blkdev_ioctl(drive, cmd, arg); 4292 return err; 4293} 4294 4295static struct block_device_operations idetape_block_ops = { 4296 .owner = THIS_MODULE, 4297 .open = idetape_open, 4298 .release = idetape_release, 4299 .ioctl = idetape_ioctl, 4300}; 4301 4302static int ide_tape_probe(ide_drive_t *drive) 4303{ 4304 idetape_tape_t *tape; 4305 struct gendisk *g; 4306 int minor; 4307 4308 if (!strstr("ide-tape", drive->driver_req)) 4309 goto failed; 4310 if (!drive->present) 4311 goto failed; 4312 if (drive->media != ide_tape) 4313 goto failed; 4314 if (!idetape_identify_device (drive)) { 4315 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); 4316 goto failed; 4317 } 4318 if (drive->scsi) { 4319 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); 4320 goto failed; 4321 } 4322 if (strstr(drive->id->model, "OnStream DI-")) { 4323 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); 4324 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); 4325 } 4326 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL); 4327 if (tape == NULL) { 4328 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); 4329 goto failed; 4330 } 4331 4332 g = alloc_disk(1 << PARTN_BITS); 4333 if (!g) 4334 goto out_free_tape; 4335 4336 ide_init_disk(g, drive); 4337 4338 ide_proc_register_driver(drive, &idetape_driver); 4339 4340 kref_init(&tape->kref); 4341 4342 tape->drive = drive; 4343 tape->driver = &idetape_driver; 4344 tape->disk = g; 4345 4346 g->private_data = &tape->driver; 4347 4348 drive->driver_data = tape; 4349 4350 mutex_lock(&idetape_ref_mutex); 4351 for (minor = 0; idetape_devs[minor]; minor++) 4352 ; 4353 idetape_devs[minor] = tape; 4354 mutex_unlock(&idetape_ref_mutex); 4355 4356 idetape_setup(drive, tape, minor); 4357 4358 device_create(idetape_sysfs_class, &drive->gendev, 4359 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); 4360 device_create(idetape_sysfs_class, &drive->gendev, 4361 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); 4362 4363 g->fops = &idetape_block_ops; 4364 ide_register_region(g); 4365 4366 return 0; 4367 4368out_free_tape: 4369 kfree(tape); 4370failed: 4371 return -ENODEV; 4372} 4373 4374MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 4375MODULE_LICENSE("GPL"); 4376 4377static void __exit idetape_exit (void) 4378{ 4379 driver_unregister(&idetape_driver.gen_driver); 4380 class_destroy(idetape_sysfs_class); 4381 unregister_chrdev(IDETAPE_MAJOR, "ht"); 4382} 4383 4384static int __init idetape_init(void) 4385{ 4386 int error = 1; 4387 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 4388 if (IS_ERR(idetape_sysfs_class)) { 4389 idetape_sysfs_class = NULL; 4390 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 4391 error = -EBUSY; 4392 goto out; 4393 } 4394 4395 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 4396 printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); 4397 error = -EBUSY; 4398 goto out_free_class; 4399 } 4400 4401 error = driver_register(&idetape_driver.gen_driver); 4402 if (error) 4403 goto out_free_driver; 4404 4405 return 0; 4406 4407out_free_driver: 4408 driver_unregister(&idetape_driver.gen_driver); 4409out_free_class: 4410 class_destroy(idetape_sysfs_class); 4411out: 4412 return error; 4413} 4414 4415MODULE_ALIAS("ide:*m-tape*"); 4416module_init(idetape_init); 4417module_exit(idetape_exit); 4418MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 4419