ide-tape.c revision b64220132640001438e4e9812e5f26a27993bf4d
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_LOG to 1 will log driver flow control. 110 * 111 * Setting them to 0 will restore normal operation mode: 112 * 113 * 1. Disable logging normal successful operations. 114 * 2. Disable self-sanity checks. 115 * 3. Errors will still be logged, of course. 116 * 117 * All the #if DEBUG code will be removed some day, when the driver 118 * is verified to be stable enough. This will make it much more 119 * esthetic. 120 */ 121#define IDETAPE_DEBUG_LOG 0 122 123/* 124 * After each failed packet command we issue a request sense command 125 * and retry the packet command IDETAPE_MAX_PC_RETRIES times. 126 * 127 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 128 */ 129#define IDETAPE_MAX_PC_RETRIES 3 130 131/* 132 * With each packet command, we allocate a buffer of 133 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet 134 * commands (Not for READ/WRITE commands). 135 */ 136#define IDETAPE_PC_BUFFER_SIZE 256 137 138/* 139 * In various places in the driver, we need to allocate storage 140 * for packet commands and requests, which will remain valid while 141 * we leave the driver to wait for an interrupt or a timeout event. 142 */ 143#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) 144 145/* 146 * Some drives (for example, Seagate STT3401A Travan) require a very long 147 * timeout, because they don't return an interrupt or clear their busy bit 148 * until after the command completes (even retension commands). 149 */ 150#define IDETAPE_WAIT_CMD (900*HZ) 151 152/* 153 * The following parameter is used to select the point in the internal 154 * tape fifo in which we will start to refill the buffer. Decreasing 155 * the following parameter will improve the system's latency and 156 * interactive response, while using a high value might improve system 157 * throughput. 158 */ 159#define IDETAPE_FIFO_THRESHOLD 2 160 161/* 162 * DSC polling parameters. 163 * 164 * Polling for DSC (a single bit in the status register) is a very 165 * important function in ide-tape. There are two cases in which we 166 * poll for DSC: 167 * 168 * 1. Before a read/write packet command, to ensure that we 169 * can transfer data from/to the tape's data buffers, without 170 * causing an actual media access. In case the tape is not 171 * ready yet, we take out our request from the device 172 * request queue, so that ide.c will service requests from 173 * the other device on the same interface meanwhile. 174 * 175 * 2. After the successful initialization of a "media access 176 * packet command", which is a command which can take a long 177 * time to complete (it can be several seconds or even an hour). 178 * 179 * Again, we postpone our request in the middle to free the bus 180 * for the other device. The polling frequency here should be 181 * lower than the read/write frequency since those media access 182 * commands are slow. We start from a "fast" frequency - 183 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC 184 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a 185 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). 186 * 187 * We also set a timeout for the timer, in case something goes wrong. 188 * The timeout should be longer then the maximum execution time of a 189 * tape operation. 190 */ 191 192/* 193 * DSC timings. 194 */ 195#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 196#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 197#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 198#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 199#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 200#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 201#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 202 203/*************************** End of tunable parameters ***********************/ 204 205/* 206 * Read/Write error simulation 207 */ 208#define SIMULATE_ERRORS 0 209 210/* 211 * For general magnetic tape device compatibility. 212 */ 213typedef enum { 214 idetape_direction_none, 215 idetape_direction_read, 216 idetape_direction_write 217} idetape_chrdev_direction_t; 218 219struct idetape_bh { 220 u32 b_size; 221 atomic_t b_count; 222 struct idetape_bh *b_reqnext; 223 char *b_data; 224}; 225 226/* 227 * Our view of a packet command. 228 */ 229typedef struct idetape_packet_command_s { 230 u8 c[12]; /* Actual packet bytes */ 231 int retries; /* On each retry, we increment retries */ 232 int error; /* Error code */ 233 int request_transfer; /* Bytes to transfer */ 234 int actually_transferred; /* Bytes actually transferred */ 235 int buffer_size; /* Size of our data buffer */ 236 struct idetape_bh *bh; 237 char *b_data; 238 int b_count; 239 u8 *buffer; /* Data buffer */ 240 u8 *current_position; /* Pointer into the above buffer */ 241 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ 242 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ 243 unsigned long flags; /* Status/Action bit flags: long for set_bit */ 244} idetape_pc_t; 245 246/* 247 * Packet command flag bits. 248 */ 249/* Set when an error is considered normal - We won't retry */ 250#define PC_ABORT 0 251/* 1 When polling for DSC on a media access command */ 252#define PC_WAIT_FOR_DSC 1 253/* 1 when we prefer to use DMA if possible */ 254#define PC_DMA_RECOMMENDED 2 255/* 1 while DMA in progress */ 256#define PC_DMA_IN_PROGRESS 3 257/* 1 when encountered problem during DMA */ 258#define PC_DMA_ERROR 4 259/* Data direction */ 260#define PC_WRITING 5 261 262/* 263 * Block Size Page 264 */ 265typedef struct { 266 unsigned page_code :6; /* Page code - Should be 0x30 */ 267 unsigned reserved1_6 :1; 268 unsigned ps :1; 269 __u8 page_length; /* Page Length - Should be 2 */ 270 __u8 reserved2; 271 unsigned play32 :1; 272 unsigned play32_5 :1; 273 unsigned reserved2_23 :2; 274 unsigned record32 :1; 275 unsigned record32_5 :1; 276 unsigned reserved2_6 :1; 277 unsigned one :1; 278} idetape_block_size_page_t; 279 280/* 281 * A pipeline stage. 282 */ 283typedef struct idetape_stage_s { 284 struct request rq; /* The corresponding request */ 285 struct idetape_bh *bh; /* The data buffers */ 286 struct idetape_stage_s *next; /* Pointer to the next stage */ 287} idetape_stage_t; 288 289/* 290 * Most of our global data which we need to save even as we leave the 291 * driver due to an interrupt or a timer event is stored in a variable 292 * of type idetape_tape_t, defined below. 293 */ 294typedef struct ide_tape_obj { 295 ide_drive_t *drive; 296 ide_driver_t *driver; 297 struct gendisk *disk; 298 struct kref kref; 299 300 /* 301 * Since a typical character device operation requires more 302 * than one packet command, we provide here enough memory 303 * for the maximum of interconnected packet commands. 304 * The packet commands are stored in the circular array pc_stack. 305 * pc_stack_index points to the last used entry, and warps around 306 * to the start when we get to the last array entry. 307 * 308 * pc points to the current processed packet command. 309 * 310 * failed_pc points to the last failed packet command, or contains 311 * NULL if we do not need to retry any packet command. This is 312 * required since an additional packet command is needed before the 313 * retry, to get detailed information on what went wrong. 314 */ 315 /* Current packet command */ 316 idetape_pc_t *pc; 317 /* Last failed packet command */ 318 idetape_pc_t *failed_pc; 319 /* Packet command stack */ 320 idetape_pc_t pc_stack[IDETAPE_PC_STACK]; 321 /* Next free packet command storage space */ 322 int pc_stack_index; 323 struct request rq_stack[IDETAPE_PC_STACK]; 324 /* We implement a circular array */ 325 int rq_stack_index; 326 327 /* 328 * DSC polling variables. 329 * 330 * While polling for DSC we use postponed_rq to postpone the 331 * current request so that ide.c will be able to service 332 * pending requests on the other device. Note that at most 333 * we will have only one DSC (usually data transfer) request 334 * in the device request queue. Additional requests can be 335 * queued in our internal pipeline, but they will be visible 336 * to ide.c only one at a time. 337 */ 338 struct request *postponed_rq; 339 /* The time in which we started polling for DSC */ 340 unsigned long dsc_polling_start; 341 /* Timer used to poll for dsc */ 342 struct timer_list dsc_timer; 343 /* Read/Write dsc polling frequency */ 344 unsigned long best_dsc_rw_frequency; 345 /* The current polling frequency */ 346 unsigned long dsc_polling_frequency; 347 /* Maximum waiting time */ 348 unsigned long dsc_timeout; 349 350 /* 351 * Read position information 352 */ 353 u8 partition; 354 /* Current block */ 355 unsigned int first_frame_position; 356 unsigned int last_frame_position; 357 unsigned int blocks_in_buffer; 358 359 /* 360 * Last error information 361 */ 362 u8 sense_key, asc, ascq; 363 364 /* 365 * Character device operation 366 */ 367 unsigned int minor; 368 /* device name */ 369 char name[4]; 370 /* Current character device data transfer direction */ 371 idetape_chrdev_direction_t chrdev_direction; 372 373 /* 374 * Device information 375 */ 376 /* Usually 512 or 1024 bytes */ 377 unsigned short tape_block_size; 378 int user_bs_factor; 379 380 /* Copy of the tape's Capabilities and Mechanical Page */ 381 u8 caps[20]; 382 383 /* 384 * Active data transfer request parameters. 385 * 386 * At most, there is only one ide-tape originated data transfer 387 * request in the device request queue. This allows ide.c to 388 * easily service requests from the other device when we 389 * postpone our active request. In the pipelined operation 390 * mode, we use our internal pipeline structure to hold 391 * more data requests. 392 * 393 * The data buffer size is chosen based on the tape's 394 * recommendation. 395 */ 396 /* Pointer to the request which is waiting in the device request queue */ 397 struct request *active_data_request; 398 /* Data buffer size (chosen based on the tape's recommendation */ 399 int stage_size; 400 idetape_stage_t *merge_stage; 401 int merge_stage_size; 402 struct idetape_bh *bh; 403 char *b_data; 404 int b_count; 405 406 /* 407 * Pipeline parameters. 408 * 409 * To accomplish non-pipelined mode, we simply set the following 410 * variables to zero (or NULL, where appropriate). 411 */ 412 /* Number of currently used stages */ 413 int nr_stages; 414 /* Number of pending stages */ 415 int nr_pending_stages; 416 /* We will not allocate more than this number of stages */ 417 int max_stages, min_pipeline, max_pipeline; 418 /* The first stage which will be removed from the pipeline */ 419 idetape_stage_t *first_stage; 420 /* The currently active stage */ 421 idetape_stage_t *active_stage; 422 /* Will be serviced after the currently active request */ 423 idetape_stage_t *next_stage; 424 /* New requests will be added to the pipeline here */ 425 idetape_stage_t *last_stage; 426 /* Optional free stage which we can use */ 427 idetape_stage_t *cache_stage; 428 int pages_per_stage; 429 /* Wasted space in each stage */ 430 int excess_bh_size; 431 432 /* Status/Action flags: long for set_bit */ 433 unsigned long flags; 434 /* protects the ide-tape queue */ 435 spinlock_t spinlock; 436 437 /* 438 * Measures average tape speed 439 */ 440 unsigned long avg_time; 441 int avg_size; 442 int avg_speed; 443 444 char vendor_id[10]; 445 char product_id[18]; 446 char firmware_revision[6]; 447 int firmware_revision_num; 448 449 /* the door is currently locked */ 450 int door_locked; 451 /* the tape hardware is write protected */ 452 char drv_write_prot; 453 /* the tape is write protected (hardware or opened as read-only) */ 454 char write_prot; 455 456 /* 457 * Limit the number of times a request can 458 * be postponed, to avoid an infinite postpone 459 * deadlock. 460 */ 461 /* request postpone count limit */ 462 int postpone_cnt; 463 464 /* 465 * Measures number of frames: 466 * 467 * 1. written/read to/from the driver pipeline (pipeline_head). 468 * 2. written/read to/from the tape buffers (idetape_bh). 469 * 3. written/read by the tape to/from the media (tape_head). 470 */ 471 int pipeline_head; 472 int buffer_head; 473 int tape_head; 474 int last_tape_head; 475 476 /* 477 * Speed control at the tape buffers input/output 478 */ 479 unsigned long insert_time; 480 int insert_size; 481 int insert_speed; 482 int max_insert_speed; 483 int measure_insert_time; 484 485 /* 486 * Measure tape still time, in milliseconds 487 */ 488 unsigned long tape_still_time_begin; 489 int tape_still_time; 490 491 /* 492 * Speed regulation negative feedback loop 493 */ 494 int speed_control; 495 int pipeline_head_speed; 496 int controlled_pipeline_head_speed; 497 int uncontrolled_pipeline_head_speed; 498 int controlled_last_pipeline_head; 499 int uncontrolled_last_pipeline_head; 500 unsigned long uncontrolled_pipeline_head_time; 501 unsigned long controlled_pipeline_head_time; 502 int controlled_previous_pipeline_head; 503 int uncontrolled_previous_pipeline_head; 504 unsigned long controlled_previous_head_time; 505 unsigned long uncontrolled_previous_head_time; 506 int restart_speed_control_req; 507 508 /* 509 * Debug_level determines amount of debugging output; 510 * can be changed using /proc/ide/hdx/settings 511 * 0 : almost no debugging output 512 * 1 : 0+output errors only 513 * 2 : 1+output all sensekey/asc 514 * 3 : 2+follow all chrdev related procedures 515 * 4 : 3+follow all procedures 516 * 5 : 4+include pc_stack rq_stack info 517 * 6 : 5+USE_COUNT updates 518 */ 519 int debug_level; 520} idetape_tape_t; 521 522static DEFINE_MUTEX(idetape_ref_mutex); 523 524static struct class *idetape_sysfs_class; 525 526#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) 527 528#define ide_tape_g(disk) \ 529 container_of((disk)->private_data, struct ide_tape_obj, driver) 530 531static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 532{ 533 struct ide_tape_obj *tape = NULL; 534 535 mutex_lock(&idetape_ref_mutex); 536 tape = ide_tape_g(disk); 537 if (tape) 538 kref_get(&tape->kref); 539 mutex_unlock(&idetape_ref_mutex); 540 return tape; 541} 542 543static void ide_tape_release(struct kref *); 544 545static void ide_tape_put(struct ide_tape_obj *tape) 546{ 547 mutex_lock(&idetape_ref_mutex); 548 kref_put(&tape->kref, ide_tape_release); 549 mutex_unlock(&idetape_ref_mutex); 550} 551 552/* 553 * Tape door status 554 */ 555#define DOOR_UNLOCKED 0 556#define DOOR_LOCKED 1 557#define DOOR_EXPLICITLY_LOCKED 2 558 559/* 560 * Tape flag bits values. 561 */ 562#define IDETAPE_IGNORE_DSC 0 563#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ 564#define IDETAPE_BUSY 2 /* Device already opened */ 565#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ 566#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ 567#define IDETAPE_FILEMARK 5 /* Currently on a filemark */ 568#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ 569#define IDETAPE_READ_ERROR 7 570#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ 571/* 0 = no tape is loaded, so we don't rewind after ejecting */ 572#define IDETAPE_MEDIUM_PRESENT 9 573 574/* 575 * Supported ATAPI tape drives packet commands 576 */ 577#define IDETAPE_TEST_UNIT_READY_CMD 0x00 578#define IDETAPE_REWIND_CMD 0x01 579#define IDETAPE_REQUEST_SENSE_CMD 0x03 580#define IDETAPE_READ_CMD 0x08 581#define IDETAPE_WRITE_CMD 0x0a 582#define IDETAPE_WRITE_FILEMARK_CMD 0x10 583#define IDETAPE_SPACE_CMD 0x11 584#define IDETAPE_INQUIRY_CMD 0x12 585#define IDETAPE_ERASE_CMD 0x19 586#define IDETAPE_MODE_SENSE_CMD 0x1a 587#define IDETAPE_MODE_SELECT_CMD 0x15 588#define IDETAPE_LOAD_UNLOAD_CMD 0x1b 589#define IDETAPE_PREVENT_CMD 0x1e 590#define IDETAPE_LOCATE_CMD 0x2b 591#define IDETAPE_READ_POSITION_CMD 0x34 592#define IDETAPE_READ_BUFFER_CMD 0x3c 593#define IDETAPE_SET_SPEED_CMD 0xbb 594 595/* 596 * Some defines for the READ BUFFER command 597 */ 598#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 599 600/* 601 * Some defines for the SPACE command 602 */ 603#define IDETAPE_SPACE_OVER_FILEMARK 1 604#define IDETAPE_SPACE_TO_EOD 3 605 606/* 607 * Some defines for the LOAD UNLOAD command 608 */ 609#define IDETAPE_LU_LOAD_MASK 1 610#define IDETAPE_LU_RETENSION_MASK 2 611#define IDETAPE_LU_EOT_MASK 4 612 613/* 614 * Special requests for our block device strategy routine. 615 * 616 * In order to service a character device command, we add special 617 * requests to the tail of our block device request queue and wait 618 * for their completion. 619 */ 620 621enum { 622 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ 623 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ 624 REQ_IDETAPE_READ = (1 << 2), 625 REQ_IDETAPE_WRITE = (1 << 3), 626 REQ_IDETAPE_READ_BUFFER = (1 << 4), 627}; 628 629/* 630 * Error codes which are returned in rq->errors to the higher part 631 * of the driver. 632 */ 633#define IDETAPE_ERROR_GENERAL 101 634#define IDETAPE_ERROR_FILEMARK 102 635#define IDETAPE_ERROR_EOD 103 636 637/* 638 * The following is used to format the general configuration word of 639 * the ATAPI IDENTIFY DEVICE command. 640 */ 641struct idetape_id_gcw { 642 unsigned packet_size :2; /* Packet Size */ 643 unsigned reserved234 :3; /* Reserved */ 644 unsigned drq_type :2; /* Command packet DRQ type */ 645 unsigned removable :1; /* Removable media */ 646 unsigned device_type :5; /* Device type */ 647 unsigned reserved13 :1; /* Reserved */ 648 unsigned protocol :2; /* Protocol type */ 649}; 650 651/* 652 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) 653 */ 654typedef struct { 655 unsigned device_type :5; /* Peripheral Device Type */ 656 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ 657 unsigned reserved1_6t0 :7; /* Reserved */ 658 unsigned rmb :1; /* Removable Medium Bit */ 659 unsigned ansi_version :3; /* ANSI Version */ 660 unsigned ecma_version :3; /* ECMA Version */ 661 unsigned iso_version :2; /* ISO Version */ 662 unsigned response_format :4; /* Response Data Format */ 663 unsigned reserved3_45 :2; /* Reserved */ 664 unsigned reserved3_6 :1; /* TrmIOP - Reserved */ 665 unsigned reserved3_7 :1; /* AENC - Reserved */ 666 __u8 additional_length; /* Additional Length (total_length-4) */ 667 __u8 rsv5, rsv6, rsv7; /* Reserved */ 668 __u8 vendor_id[8]; /* Vendor Identification */ 669 __u8 product_id[16]; /* Product Identification */ 670 __u8 revision_level[4]; /* Revision Level */ 671 __u8 vendor_specific[20]; /* Vendor Specific - Optional */ 672 __u8 reserved56t95[40]; /* Reserved - Optional */ 673 /* Additional information may be returned */ 674} idetape_inquiry_result_t; 675 676/* 677 * READ POSITION packet command - Data Format (From Table 6-57) 678 */ 679typedef struct { 680 unsigned reserved0_10 :2; /* Reserved */ 681 unsigned bpu :1; /* Block Position Unknown */ 682 unsigned reserved0_543 :3; /* Reserved */ 683 unsigned eop :1; /* End Of Partition */ 684 unsigned bop :1; /* Beginning Of Partition */ 685 u8 partition; /* Partition Number */ 686 u8 reserved2, reserved3; /* Reserved */ 687 u32 first_block; /* First Block Location */ 688 u32 last_block; /* Last Block Location (Optional) */ 689 u8 reserved12; /* Reserved */ 690 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ 691 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ 692} idetape_read_position_result_t; 693 694/* 695 * Follows structures which are related to the SELECT SENSE / MODE SENSE 696 * packet commands. Those packet commands are still not supported 697 * by ide-tape. 698 */ 699#define IDETAPE_BLOCK_DESCRIPTOR 0 700#define IDETAPE_CAPABILITIES_PAGE 0x2a 701#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ 702#define IDETAPE_BLOCK_SIZE_PAGE 0x30 703#define IDETAPE_BUFFER_FILLING_PAGE 0x33 704 705/* 706 * Mode Parameter Block Descriptor the MODE SENSE packet command 707 * 708 * Support for block descriptors is optional. 709 */ 710typedef struct { 711 __u8 density_code; /* Medium density code */ 712 __u8 blocks[3]; /* Number of blocks */ 713 __u8 reserved4; /* Reserved */ 714 __u8 length[3]; /* Block Length */ 715} idetape_parameter_block_descriptor_t; 716 717/* 718 * The Data Compression Page, as returned by the MODE SENSE packet command. 719 */ 720typedef struct { 721 unsigned page_code :6; /* Page Code - Should be 0xf */ 722 unsigned reserved0 :1; /* Reserved */ 723 unsigned ps :1; 724 __u8 page_length; /* Page Length - Should be 14 */ 725 unsigned reserved2 :6; /* Reserved */ 726 unsigned dcc :1; /* Data Compression Capable */ 727 unsigned dce :1; /* Data Compression Enable */ 728 unsigned reserved3 :5; /* Reserved */ 729 unsigned red :2; /* Report Exception on Decompression */ 730 unsigned dde :1; /* Data Decompression Enable */ 731 __u32 ca; /* Compression Algorithm */ 732 __u32 da; /* Decompression Algorithm */ 733 __u8 reserved[4]; /* Reserved */ 734} idetape_data_compression_page_t; 735 736/* 737 * The Medium Partition Page, as returned by the MODE SENSE packet command. 738 */ 739typedef struct { 740 unsigned page_code :6; /* Page Code - Should be 0x11 */ 741 unsigned reserved1_6 :1; /* Reserved */ 742 unsigned ps :1; 743 __u8 page_length; /* Page Length - Should be 6 */ 744 __u8 map; /* Maximum Additional Partitions - Should be 0 */ 745 __u8 apd; /* Additional Partitions Defined - Should be 0 */ 746 unsigned reserved4_012 :3; /* Reserved */ 747 unsigned psum :2; /* Should be 0 */ 748 unsigned idp :1; /* Should be 0 */ 749 unsigned sdp :1; /* Should be 0 */ 750 unsigned fdp :1; /* Fixed Data Partitions */ 751 __u8 mfr; /* Medium Format Recognition */ 752 __u8 reserved[2]; /* Reserved */ 753} idetape_medium_partition_page_t; 754 755/* 756 * Run time configurable parameters. 757 */ 758typedef struct { 759 int dsc_rw_frequency; 760 int dsc_media_access_frequency; 761 int nr_stages; 762} idetape_config_t; 763 764/* 765 * The variables below are used for the character device interface. 766 * Additional state variables are defined in our ide_drive_t structure. 767 */ 768static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; 769 770#define ide_tape_f(file) ((file)->private_data) 771 772static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 773{ 774 struct ide_tape_obj *tape = NULL; 775 776 mutex_lock(&idetape_ref_mutex); 777 tape = idetape_devs[i]; 778 if (tape) 779 kref_get(&tape->kref); 780 mutex_unlock(&idetape_ref_mutex); 781 return tape; 782} 783 784/* 785 * Function declarations 786 * 787 */ 788static int idetape_chrdev_release (struct inode *inode, struct file *filp); 789static void idetape_write_release (ide_drive_t *drive, unsigned int minor); 790 791/* 792 * Too bad. The drive wants to send us data which we are not ready to accept. 793 * Just throw it away. 794 */ 795static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) 796{ 797 while (bcount--) 798 (void) HWIF(drive)->INB(IDE_DATA_REG); 799} 800 801static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 802{ 803 struct idetape_bh *bh = pc->bh; 804 int count; 805 806 while (bcount) { 807 if (bh == NULL) { 808 printk(KERN_ERR "ide-tape: bh == NULL in " 809 "idetape_input_buffers\n"); 810 idetape_discard_data(drive, bcount); 811 return; 812 } 813 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); 814 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); 815 bcount -= count; 816 atomic_add(count, &bh->b_count); 817 if (atomic_read(&bh->b_count) == bh->b_size) { 818 bh = bh->b_reqnext; 819 if (bh) 820 atomic_set(&bh->b_count, 0); 821 } 822 } 823 pc->bh = bh; 824} 825 826static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 827{ 828 struct idetape_bh *bh = pc->bh; 829 int count; 830 831 while (bcount) { 832 if (bh == NULL) { 833 printk(KERN_ERR "ide-tape: bh == NULL in " 834 "idetape_output_buffers\n"); 835 return; 836 } 837 count = min((unsigned int)pc->b_count, (unsigned int)bcount); 838 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); 839 bcount -= count; 840 pc->b_data += count; 841 pc->b_count -= count; 842 if (!pc->b_count) { 843 pc->bh = bh = bh->b_reqnext; 844 if (bh) { 845 pc->b_data = bh->b_data; 846 pc->b_count = atomic_read(&bh->b_count); 847 } 848 } 849 } 850} 851 852static void idetape_update_buffers (idetape_pc_t *pc) 853{ 854 struct idetape_bh *bh = pc->bh; 855 int count; 856 unsigned int bcount = pc->actually_transferred; 857 858 if (test_bit(PC_WRITING, &pc->flags)) 859 return; 860 while (bcount) { 861 if (bh == NULL) { 862 printk(KERN_ERR "ide-tape: bh == NULL in " 863 "idetape_update_buffers\n"); 864 return; 865 } 866 count = min((unsigned int)bh->b_size, (unsigned int)bcount); 867 atomic_set(&bh->b_count, count); 868 if (atomic_read(&bh->b_count) == bh->b_size) 869 bh = bh->b_reqnext; 870 bcount -= count; 871 } 872 pc->bh = bh; 873} 874 875/* 876 * idetape_next_pc_storage returns a pointer to a place in which we can 877 * safely store a packet command, even though we intend to leave the 878 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet 879 * commands is allocated at initialization time. 880 */ 881static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) 882{ 883 idetape_tape_t *tape = drive->driver_data; 884 885#if IDETAPE_DEBUG_LOG 886 if (tape->debug_level >= 5) 887 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", 888 tape->pc_stack_index); 889#endif /* IDETAPE_DEBUG_LOG */ 890 if (tape->pc_stack_index == IDETAPE_PC_STACK) 891 tape->pc_stack_index=0; 892 return (&tape->pc_stack[tape->pc_stack_index++]); 893} 894 895/* 896 * idetape_next_rq_storage is used along with idetape_next_pc_storage. 897 * Since we queue packet commands in the request queue, we need to 898 * allocate a request, along with the allocation of a packet command. 899 */ 900 901/************************************************************** 902 * * 903 * This should get fixed to use kmalloc(.., GFP_ATOMIC) * 904 * followed later on by kfree(). -ml * 905 * * 906 **************************************************************/ 907 908static struct request *idetape_next_rq_storage (ide_drive_t *drive) 909{ 910 idetape_tape_t *tape = drive->driver_data; 911 912#if IDETAPE_DEBUG_LOG 913 if (tape->debug_level >= 5) 914 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", 915 tape->rq_stack_index); 916#endif /* IDETAPE_DEBUG_LOG */ 917 if (tape->rq_stack_index == IDETAPE_PC_STACK) 918 tape->rq_stack_index=0; 919 return (&tape->rq_stack[tape->rq_stack_index++]); 920} 921 922/* 923 * idetape_init_pc initializes a packet command. 924 */ 925static void idetape_init_pc (idetape_pc_t *pc) 926{ 927 memset(pc->c, 0, 12); 928 pc->retries = 0; 929 pc->flags = 0; 930 pc->request_transfer = 0; 931 pc->buffer = pc->pc_buffer; 932 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; 933 pc->bh = NULL; 934 pc->b_data = NULL; 935} 936 937/* 938 * called on each failed packet command retry to analyze the request sense. We 939 * currently do not utilize this information. 940 */ 941static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) 942{ 943 idetape_tape_t *tape = drive->driver_data; 944 idetape_pc_t *pc = tape->failed_pc; 945 946 tape->sense_key = sense[2] & 0xF; 947 tape->asc = sense[12]; 948 tape->ascq = sense[13]; 949#if IDETAPE_DEBUG_LOG 950 /* 951 * Without debugging, we only log an error if we decided to give up 952 * retrying. 953 */ 954 if (tape->debug_level >= 1) 955 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " 956 "asc = %x, ascq = %x\n", 957 pc->c[0], tape->sense_key, 958 tape->asc, tape->ascq); 959#endif /* IDETAPE_DEBUG_LOG */ 960 961 /* Correct pc->actually_transferred by asking the tape. */ 962 if (test_bit(PC_DMA_ERROR, &pc->flags)) { 963 pc->actually_transferred = pc->request_transfer - 964 tape->tape_block_size * 965 ntohl(get_unaligned((u32 *)&sense[3])); 966 idetape_update_buffers(pc); 967 } 968 969 /* 970 * If error was the result of a zero-length read or write command, 971 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 972 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 973 */ 974 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) 975 /* length == 0 */ 976 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 977 if (tape->sense_key == 5) { 978 /* don't report an error, everything's ok */ 979 pc->error = 0; 980 /* don't retry read/write */ 981 set_bit(PC_ABORT, &pc->flags); 982 } 983 } 984 if (pc->c[0] == IDETAPE_READ_CMD && (sense[2] & 0x80)) { 985 pc->error = IDETAPE_ERROR_FILEMARK; 986 set_bit(PC_ABORT, &pc->flags); 987 } 988 if (pc->c[0] == IDETAPE_WRITE_CMD) { 989 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 990 && tape->asc == 0x0 && tape->ascq == 0x2)) { 991 pc->error = IDETAPE_ERROR_EOD; 992 set_bit(PC_ABORT, &pc->flags); 993 } 994 } 995 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { 996 if (tape->sense_key == 8) { 997 pc->error = IDETAPE_ERROR_EOD; 998 set_bit(PC_ABORT, &pc->flags); 999 } 1000 if (!test_bit(PC_ABORT, &pc->flags) && 1001 pc->actually_transferred) 1002 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 1003 } 1004} 1005 1006/* 1007 * idetape_active_next_stage will declare the next stage as "active". 1008 */ 1009static void idetape_active_next_stage (ide_drive_t *drive) 1010{ 1011 idetape_tape_t *tape = drive->driver_data; 1012 idetape_stage_t *stage = tape->next_stage; 1013 struct request *rq = &stage->rq; 1014 1015#if IDETAPE_DEBUG_LOG 1016 if (tape->debug_level >= 4) 1017 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); 1018#endif /* IDETAPE_DEBUG_LOG */ 1019 if (stage == NULL) { 1020 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); 1021 return; 1022 } 1023 1024 rq->rq_disk = tape->disk; 1025 rq->buffer = NULL; 1026 rq->special = (void *)stage->bh; 1027 tape->active_data_request = rq; 1028 tape->active_stage = stage; 1029 tape->next_stage = stage->next; 1030} 1031 1032/* 1033 * idetape_increase_max_pipeline_stages is a part of the feedback 1034 * loop which tries to find the optimum number of stages. In the 1035 * feedback loop, we are starting from a minimum maximum number of 1036 * stages, and if we sense that the pipeline is empty, we try to 1037 * increase it, until we reach the user compile time memory limit. 1038 */ 1039static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) 1040{ 1041 idetape_tape_t *tape = drive->driver_data; 1042 int increase = (tape->max_pipeline - tape->min_pipeline) / 10; 1043 1044#if IDETAPE_DEBUG_LOG 1045 if (tape->debug_level >= 4) 1046 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); 1047#endif /* IDETAPE_DEBUG_LOG */ 1048 1049 tape->max_stages += max(increase, 1); 1050 tape->max_stages = max(tape->max_stages, tape->min_pipeline); 1051 tape->max_stages = min(tape->max_stages, tape->max_pipeline); 1052} 1053 1054/* 1055 * idetape_kfree_stage calls kfree to completely free a stage, along with 1056 * its related buffers. 1057 */ 1058static void __idetape_kfree_stage (idetape_stage_t *stage) 1059{ 1060 struct idetape_bh *prev_bh, *bh = stage->bh; 1061 int size; 1062 1063 while (bh != NULL) { 1064 if (bh->b_data != NULL) { 1065 size = (int) bh->b_size; 1066 while (size > 0) { 1067 free_page((unsigned long) bh->b_data); 1068 size -= PAGE_SIZE; 1069 bh->b_data += PAGE_SIZE; 1070 } 1071 } 1072 prev_bh = bh; 1073 bh = bh->b_reqnext; 1074 kfree(prev_bh); 1075 } 1076 kfree(stage); 1077} 1078 1079static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) 1080{ 1081 __idetape_kfree_stage(stage); 1082} 1083 1084/* 1085 * idetape_remove_stage_head removes tape->first_stage from the pipeline. 1086 * The caller should avoid race conditions. 1087 */ 1088static void idetape_remove_stage_head (ide_drive_t *drive) 1089{ 1090 idetape_tape_t *tape = drive->driver_data; 1091 idetape_stage_t *stage; 1092 1093#if IDETAPE_DEBUG_LOG 1094 if (tape->debug_level >= 4) 1095 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); 1096#endif /* IDETAPE_DEBUG_LOG */ 1097 if (tape->first_stage == NULL) { 1098 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); 1099 return; 1100 } 1101 if (tape->active_stage == tape->first_stage) { 1102 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); 1103 return; 1104 } 1105 stage = tape->first_stage; 1106 tape->first_stage = stage->next; 1107 idetape_kfree_stage(tape, stage); 1108 tape->nr_stages--; 1109 if (tape->first_stage == NULL) { 1110 tape->last_stage = NULL; 1111 if (tape->next_stage != NULL) 1112 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); 1113 if (tape->nr_stages) 1114 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); 1115 } 1116} 1117 1118/* 1119 * This will free all the pipeline stages starting from new_last_stage->next 1120 * to the end of the list, and point tape->last_stage to new_last_stage. 1121 */ 1122static void idetape_abort_pipeline(ide_drive_t *drive, 1123 idetape_stage_t *new_last_stage) 1124{ 1125 idetape_tape_t *tape = drive->driver_data; 1126 idetape_stage_t *stage = new_last_stage->next; 1127 idetape_stage_t *nstage; 1128 1129#if IDETAPE_DEBUG_LOG 1130 if (tape->debug_level >= 4) 1131 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); 1132#endif 1133 while (stage) { 1134 nstage = stage->next; 1135 idetape_kfree_stage(tape, stage); 1136 --tape->nr_stages; 1137 --tape->nr_pending_stages; 1138 stage = nstage; 1139 } 1140 if (new_last_stage) 1141 new_last_stage->next = NULL; 1142 tape->last_stage = new_last_stage; 1143 tape->next_stage = NULL; 1144} 1145 1146/* 1147 * idetape_end_request is used to finish servicing a request, and to 1148 * insert a pending pipeline request into the main device queue. 1149 */ 1150static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) 1151{ 1152 struct request *rq = HWGROUP(drive)->rq; 1153 idetape_tape_t *tape = drive->driver_data; 1154 unsigned long flags; 1155 int error; 1156 int remove_stage = 0; 1157 idetape_stage_t *active_stage; 1158 1159#if IDETAPE_DEBUG_LOG 1160 if (tape->debug_level >= 4) 1161 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); 1162#endif /* IDETAPE_DEBUG_LOG */ 1163 1164 switch (uptodate) { 1165 case 0: error = IDETAPE_ERROR_GENERAL; break; 1166 case 1: error = 0; break; 1167 default: error = uptodate; 1168 } 1169 rq->errors = error; 1170 if (error) 1171 tape->failed_pc = NULL; 1172 1173 if (!blk_special_request(rq)) { 1174 ide_end_request(drive, uptodate, nr_sects); 1175 return 0; 1176 } 1177 1178 spin_lock_irqsave(&tape->spinlock, flags); 1179 1180 /* The request was a pipelined data transfer request */ 1181 if (tape->active_data_request == rq) { 1182 active_stage = tape->active_stage; 1183 tape->active_stage = NULL; 1184 tape->active_data_request = NULL; 1185 tape->nr_pending_stages--; 1186 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 1187 remove_stage = 1; 1188 if (error) { 1189 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1190 if (error == IDETAPE_ERROR_EOD) 1191 idetape_abort_pipeline(drive, active_stage); 1192 } 1193 } else if (rq->cmd[0] & REQ_IDETAPE_READ) { 1194 if (error == IDETAPE_ERROR_EOD) { 1195 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1196 idetape_abort_pipeline(drive, active_stage); 1197 } 1198 } 1199 if (tape->next_stage != NULL) { 1200 idetape_active_next_stage(drive); 1201 1202 /* 1203 * Insert the next request into the request queue. 1204 */ 1205 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 1206 } else if (!error) { 1207 idetape_increase_max_pipeline_stages(drive); 1208 } 1209 } 1210 ide_end_drive_cmd(drive, 0, 0); 1211// blkdev_dequeue_request(rq); 1212// drive->rq = NULL; 1213// end_that_request_last(rq); 1214 1215 if (remove_stage) 1216 idetape_remove_stage_head(drive); 1217 if (tape->active_data_request == NULL) 1218 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 1219 spin_unlock_irqrestore(&tape->spinlock, flags); 1220 return 0; 1221} 1222 1223static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) 1224{ 1225 idetape_tape_t *tape = drive->driver_data; 1226 1227#if IDETAPE_DEBUG_LOG 1228 if (tape->debug_level >= 4) 1229 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); 1230#endif /* IDETAPE_DEBUG_LOG */ 1231 if (!tape->pc->error) { 1232 idetape_analyze_error(drive, tape->pc->buffer); 1233 idetape_end_request(drive, 1, 0); 1234 } else { 1235 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); 1236 idetape_end_request(drive, 0, 0); 1237 } 1238 return ide_stopped; 1239} 1240 1241static void idetape_create_request_sense_cmd (idetape_pc_t *pc) 1242{ 1243 idetape_init_pc(pc); 1244 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; 1245 pc->c[4] = 20; 1246 pc->request_transfer = 20; 1247 pc->callback = &idetape_request_sense_callback; 1248} 1249 1250static void idetape_init_rq(struct request *rq, u8 cmd) 1251{ 1252 memset(rq, 0, sizeof(*rq)); 1253 rq->cmd_type = REQ_TYPE_SPECIAL; 1254 rq->cmd[0] = cmd; 1255} 1256 1257/* 1258 * idetape_queue_pc_head generates a new packet command request in front 1259 * of the request queue, before the current request, so that it will be 1260 * processed immediately, on the next pass through the driver. 1261 * 1262 * idetape_queue_pc_head is called from the request handling part of 1263 * the driver (the "bottom" part). Safe storage for the request should 1264 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage 1265 * before calling idetape_queue_pc_head. 1266 * 1267 * Memory for those requests is pre-allocated at initialization time, and 1268 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough 1269 * space for the maximum possible number of inter-dependent packet commands. 1270 * 1271 * The higher level of the driver - The ioctl handler and the character 1272 * device handling functions should queue request to the lower level part 1273 * and wait for their completion using idetape_queue_pc_tail or 1274 * idetape_queue_rw_tail. 1275 */ 1276static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) 1277{ 1278 struct ide_tape_obj *tape = drive->driver_data; 1279 1280 idetape_init_rq(rq, REQ_IDETAPE_PC1); 1281 rq->buffer = (char *) pc; 1282 rq->rq_disk = tape->disk; 1283 (void) ide_do_drive_cmd(drive, rq, ide_preempt); 1284} 1285 1286/* 1287 * idetape_retry_pc is called when an error was detected during the 1288 * last packet command. We queue a request sense packet command in 1289 * the head of the request list. 1290 */ 1291static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) 1292{ 1293 idetape_tape_t *tape = drive->driver_data; 1294 idetape_pc_t *pc; 1295 struct request *rq; 1296 1297 (void)drive->hwif->INB(IDE_ERROR_REG); 1298 pc = idetape_next_pc_storage(drive); 1299 rq = idetape_next_rq_storage(drive); 1300 idetape_create_request_sense_cmd(pc); 1301 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 1302 idetape_queue_pc_head(drive, pc, rq); 1303 return ide_stopped; 1304} 1305 1306/* 1307 * idetape_postpone_request postpones the current request so that 1308 * ide.c will be able to service requests from another device on 1309 * the same hwgroup while we are polling for DSC. 1310 */ 1311static void idetape_postpone_request (ide_drive_t *drive) 1312{ 1313 idetape_tape_t *tape = drive->driver_data; 1314 1315#if IDETAPE_DEBUG_LOG 1316 if (tape->debug_level >= 4) 1317 printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); 1318#endif 1319 tape->postponed_rq = HWGROUP(drive)->rq; 1320 ide_stall_queue(drive, tape->dsc_polling_frequency); 1321} 1322 1323/* 1324 * idetape_pc_intr is the usual interrupt handler which will be called 1325 * during a packet command. We will transfer some of the data (as 1326 * requested by the drive) and will re-point interrupt handler to us. 1327 * When data transfer is finished, we will act according to the 1328 * algorithm described before idetape_issue_packet_command. 1329 * 1330 */ 1331static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) 1332{ 1333 ide_hwif_t *hwif = drive->hwif; 1334 idetape_tape_t *tape = drive->driver_data; 1335 idetape_pc_t *pc = tape->pc; 1336 unsigned int temp; 1337#if SIMULATE_ERRORS 1338 static int error_sim_count = 0; 1339#endif 1340 u16 bcount; 1341 u8 stat, ireason; 1342 1343#if IDETAPE_DEBUG_LOG 1344 if (tape->debug_level >= 4) 1345 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " 1346 "interrupt handler\n"); 1347#endif /* IDETAPE_DEBUG_LOG */ 1348 1349 /* Clear the interrupt */ 1350 stat = hwif->INB(IDE_STATUS_REG); 1351 1352 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1353 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) { 1354 /* 1355 * A DMA error is sometimes expected. For example, 1356 * if the tape is crossing a filemark during a 1357 * READ command, it will issue an irq and position 1358 * itself before the filemark, so that only a partial 1359 * data transfer will occur (which causes the DMA 1360 * error). In that case, we will later ask the tape 1361 * how much bytes of the original request were 1362 * actually transferred (we can't receive that 1363 * information from the DMA engine on most chipsets). 1364 */ 1365 1366 /* 1367 * On the contrary, a DMA error is never expected; 1368 * it usually indicates a hardware error or abort. 1369 * If the tape crosses a filemark during a READ 1370 * command, it will issue an irq and position itself 1371 * after the filemark (not before). Only a partial 1372 * data transfer will occur, but no DMA error. 1373 * (AS, 19 Apr 2001) 1374 */ 1375 set_bit(PC_DMA_ERROR, &pc->flags); 1376 } else { 1377 pc->actually_transferred = pc->request_transfer; 1378 idetape_update_buffers(pc); 1379 } 1380#if IDETAPE_DEBUG_LOG 1381 if (tape->debug_level >= 4) 1382 printk(KERN_INFO "ide-tape: DMA finished\n"); 1383#endif /* IDETAPE_DEBUG_LOG */ 1384 } 1385 1386 /* No more interrupts */ 1387 if ((stat & DRQ_STAT) == 0) { 1388#if IDETAPE_DEBUG_LOG 1389 if (tape->debug_level >= 2) 1390 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); 1391#endif /* IDETAPE_DEBUG_LOG */ 1392 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); 1393 1394 local_irq_enable(); 1395 1396#if SIMULATE_ERRORS 1397 if ((pc->c[0] == IDETAPE_WRITE_CMD || 1398 pc->c[0] == IDETAPE_READ_CMD) && 1399 (++error_sim_count % 100) == 0) { 1400 printk(KERN_INFO "ide-tape: %s: simulating error\n", 1401 tape->name); 1402 stat |= ERR_STAT; 1403 } 1404#endif 1405 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) 1406 stat &= ~ERR_STAT; 1407 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) { 1408 /* Error detected */ 1409#if IDETAPE_DEBUG_LOG 1410 if (tape->debug_level >= 1) 1411 printk(KERN_INFO "ide-tape: %s: I/O error\n", 1412 tape->name); 1413#endif /* IDETAPE_DEBUG_LOG */ 1414 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1415 printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); 1416 return ide_do_reset(drive); 1417 } 1418#if IDETAPE_DEBUG_LOG 1419 if (tape->debug_level >= 1) 1420 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); 1421#endif 1422 /* Retry operation */ 1423 return idetape_retry_pc(drive); 1424 } 1425 pc->error = 0; 1426 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && 1427 (stat & SEEK_STAT) == 0) { 1428 /* Media access command */ 1429 tape->dsc_polling_start = jiffies; 1430 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; 1431 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 1432 /* Allow ide.c to handle other requests */ 1433 idetape_postpone_request(drive); 1434 return ide_stopped; 1435 } 1436 if (tape->failed_pc == pc) 1437 tape->failed_pc = NULL; 1438 /* Command finished - Call the callback function */ 1439 return pc->callback(drive); 1440 } 1441 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1442 printk(KERN_ERR "ide-tape: The tape wants to issue more " 1443 "interrupts in DMA mode\n"); 1444 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); 1445 ide_dma_off(drive); 1446 return ide_do_reset(drive); 1447 } 1448 /* Get the number of bytes to transfer on this interrupt. */ 1449 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | 1450 hwif->INB(IDE_BCOUNTL_REG); 1451 1452 ireason = hwif->INB(IDE_IREASON_REG); 1453 1454 if (ireason & CD) { 1455 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); 1456 return ide_do_reset(drive); 1457 } 1458 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) { 1459 /* Hopefully, we will never get here */ 1460 printk(KERN_ERR "ide-tape: We wanted to %s, ", 1461 (ireason & IO) ? "Write" : "Read"); 1462 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", 1463 (ireason & IO) ? "Read" : "Write"); 1464 return ide_do_reset(drive); 1465 } 1466 if (!test_bit(PC_WRITING, &pc->flags)) { 1467 /* Reading - Check that we have enough space */ 1468 temp = pc->actually_transferred + bcount; 1469 if (temp > pc->request_transfer) { 1470 if (temp > pc->buffer_size) { 1471 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); 1472 idetape_discard_data(drive, bcount); 1473 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1474 return ide_started; 1475 } 1476#if IDETAPE_DEBUG_LOG 1477 if (tape->debug_level >= 2) 1478 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); 1479#endif /* IDETAPE_DEBUG_LOG */ 1480 } 1481 } 1482 if (test_bit(PC_WRITING, &pc->flags)) { 1483 if (pc->bh != NULL) 1484 idetape_output_buffers(drive, pc, bcount); 1485 else 1486 /* Write the current buffer */ 1487 hwif->atapi_output_bytes(drive, pc->current_position, 1488 bcount); 1489 } else { 1490 if (pc->bh != NULL) 1491 idetape_input_buffers(drive, pc, bcount); 1492 else 1493 /* Read the current buffer */ 1494 hwif->atapi_input_bytes(drive, pc->current_position, 1495 bcount); 1496 } 1497 /* Update the current position */ 1498 pc->actually_transferred += bcount; 1499 pc->current_position += bcount; 1500#if IDETAPE_DEBUG_LOG 1501 if (tape->debug_level >= 2) 1502 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes " 1503 "on that interrupt\n", pc->c[0], bcount); 1504#endif 1505 /* And set the interrupt handler again */ 1506 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1507 return ide_started; 1508} 1509 1510/* 1511 * Packet Command Interface 1512 * 1513 * The current Packet Command is available in tape->pc, and will not 1514 * change until we finish handling it. Each packet command is associated 1515 * with a callback function that will be called when the command is 1516 * finished. 1517 * 1518 * The handling will be done in three stages: 1519 * 1520 * 1. idetape_issue_packet_command will send the packet command to the 1521 * drive, and will set the interrupt handler to idetape_pc_intr. 1522 * 1523 * 2. On each interrupt, idetape_pc_intr will be called. This step 1524 * will be repeated until the device signals us that no more 1525 * interrupts will be issued. 1526 * 1527 * 3. ATAPI Tape media access commands have immediate status with a 1528 * delayed process. In case of a successful initiation of a 1529 * media access packet command, the DSC bit will be set when the 1530 * actual execution of the command is finished. 1531 * Since the tape drive will not issue an interrupt, we have to 1532 * poll for this event. In this case, we define the request as 1533 * "low priority request" by setting rq_status to 1534 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit 1535 * the driver. 1536 * 1537 * ide.c will then give higher priority to requests which 1538 * originate from the other device, until will change rq_status 1539 * to RQ_ACTIVE. 1540 * 1541 * 4. When the packet command is finished, it will be checked for errors. 1542 * 1543 * 5. In case an error was found, we queue a request sense packet 1544 * command in front of the request queue and retry the operation 1545 * up to IDETAPE_MAX_PC_RETRIES times. 1546 * 1547 * 6. In case no error was found, or we decided to give up and not 1548 * to retry again, the callback function will be called and then 1549 * we will handle the next request. 1550 * 1551 */ 1552static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 1553{ 1554 ide_hwif_t *hwif = drive->hwif; 1555 idetape_tape_t *tape = drive->driver_data; 1556 idetape_pc_t *pc = tape->pc; 1557 int retries = 100; 1558 ide_startstop_t startstop; 1559 u8 ireason; 1560 1561 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { 1562 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); 1563 return startstop; 1564 } 1565 ireason = hwif->INB(IDE_IREASON_REG); 1566 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { 1567 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " 1568 "a packet command, retrying\n"); 1569 udelay(100); 1570 ireason = hwif->INB(IDE_IREASON_REG); 1571 if (retries == 0) { 1572 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " 1573 "issuing a packet command, ignoring\n"); 1574 ireason |= CD; 1575 ireason &= ~IO; 1576 } 1577 } 1578 if ((ireason & CD) == 0 || (ireason & IO)) { 1579 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " 1580 "a packet command\n"); 1581 return ide_do_reset(drive); 1582 } 1583 /* Set the interrupt routine */ 1584 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1585#ifdef CONFIG_BLK_DEV_IDEDMA 1586 /* Begin DMA, if necessary */ 1587 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) 1588 hwif->dma_start(drive); 1589#endif 1590 /* Send the actual packet */ 1591 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); 1592 return ide_started; 1593} 1594 1595static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) 1596{ 1597 ide_hwif_t *hwif = drive->hwif; 1598 idetape_tape_t *tape = drive->driver_data; 1599 int dma_ok = 0; 1600 u16 bcount; 1601 1602 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && 1603 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1604 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " 1605 "Two request sense in serial were issued\n"); 1606 } 1607 1608 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) 1609 tape->failed_pc = pc; 1610 /* Set the current packet command */ 1611 tape->pc = pc; 1612 1613 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 1614 test_bit(PC_ABORT, &pc->flags)) { 1615 /* 1616 * We will "abort" retrying a packet command in case 1617 * a legitimate error code was received (crossing a 1618 * filemark, or end of the media, for example). 1619 */ 1620 if (!test_bit(PC_ABORT, &pc->flags)) { 1621 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && 1622 tape->sense_key == 2 && tape->asc == 4 && 1623 (tape->ascq == 1 || tape->ascq == 8))) { 1624 printk(KERN_ERR "ide-tape: %s: I/O error, " 1625 "pc = %2x, key = %2x, " 1626 "asc = %2x, ascq = %2x\n", 1627 tape->name, pc->c[0], 1628 tape->sense_key, tape->asc, 1629 tape->ascq); 1630 } 1631 /* Giving up */ 1632 pc->error = IDETAPE_ERROR_GENERAL; 1633 } 1634 tape->failed_pc = NULL; 1635 return pc->callback(drive); 1636 } 1637#if IDETAPE_DEBUG_LOG 1638 if (tape->debug_level >= 2) 1639 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); 1640#endif /* IDETAPE_DEBUG_LOG */ 1641 1642 pc->retries++; 1643 /* We haven't transferred any data yet */ 1644 pc->actually_transferred = 0; 1645 pc->current_position = pc->buffer; 1646 /* Request to transfer the entire buffer at once */ 1647 bcount = pc->request_transfer; 1648 1649 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { 1650 printk(KERN_WARNING "ide-tape: DMA disabled, " 1651 "reverting to PIO\n"); 1652 ide_dma_off(drive); 1653 } 1654 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) 1655 dma_ok = !hwif->dma_setup(drive); 1656 1657 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | 1658 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); 1659 1660 if (dma_ok) /* Will begin DMA later */ 1661 set_bit(PC_DMA_IN_PROGRESS, &pc->flags); 1662 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { 1663 ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc, 1664 IDETAPE_WAIT_CMD, NULL); 1665 return ide_started; 1666 } else { 1667 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); 1668 return idetape_transfer_pc(drive); 1669 } 1670} 1671 1672/* 1673 * General packet command callback function. 1674 */ 1675static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) 1676{ 1677 idetape_tape_t *tape = drive->driver_data; 1678 1679#if IDETAPE_DEBUG_LOG 1680 if (tape->debug_level >= 4) 1681 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); 1682#endif /* IDETAPE_DEBUG_LOG */ 1683 1684 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); 1685 return ide_stopped; 1686} 1687 1688/* 1689 * A mode sense command is used to "sense" tape parameters. 1690 */ 1691static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) 1692{ 1693 idetape_init_pc(pc); 1694 pc->c[0] = IDETAPE_MODE_SENSE_CMD; 1695 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 1696 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ 1697 pc->c[2] = page_code; 1698 /* 1699 * Changed pc->c[3] to 0 (255 will at best return unused info). 1700 * 1701 * For SCSI this byte is defined as subpage instead of high byte 1702 * of length and some IDE drives seem to interpret it this way 1703 * and return an error when 255 is used. 1704 */ 1705 pc->c[3] = 0; 1706 pc->c[4] = 255; /* (We will just discard data in that case) */ 1707 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 1708 pc->request_transfer = 12; 1709 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 1710 pc->request_transfer = 24; 1711 else 1712 pc->request_transfer = 50; 1713 pc->callback = &idetape_pc_callback; 1714} 1715 1716static void calculate_speeds(ide_drive_t *drive) 1717{ 1718 idetape_tape_t *tape = drive->driver_data; 1719 int full = 125, empty = 75; 1720 1721 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { 1722 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; 1723 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; 1724 tape->controlled_last_pipeline_head = tape->pipeline_head; 1725 tape->controlled_pipeline_head_time = jiffies; 1726 } 1727 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) 1728 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); 1729 else if (time_after(jiffies, tape->controlled_previous_head_time)) 1730 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); 1731 1732 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { 1733 /* -1 for read mode error recovery */ 1734 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { 1735 tape->uncontrolled_pipeline_head_time = jiffies; 1736 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); 1737 } 1738 } else { 1739 tape->uncontrolled_previous_head_time = jiffies; 1740 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; 1741 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { 1742 tape->uncontrolled_pipeline_head_time = jiffies; 1743 } 1744 } 1745 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); 1746 if (tape->speed_control == 0) { 1747 tape->max_insert_speed = 5000; 1748 } else if (tape->speed_control == 1) { 1749 if (tape->nr_pending_stages >= tape->max_stages / 2) 1750 tape->max_insert_speed = tape->pipeline_head_speed + 1751 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; 1752 else 1753 tape->max_insert_speed = 500 + 1754 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; 1755 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) 1756 tape->max_insert_speed = 5000; 1757 } else if (tape->speed_control == 2) { 1758 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + 1759 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; 1760 } else 1761 tape->max_insert_speed = tape->speed_control; 1762 tape->max_insert_speed = max(tape->max_insert_speed, 500); 1763} 1764 1765static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) 1766{ 1767 idetape_tape_t *tape = drive->driver_data; 1768 idetape_pc_t *pc = tape->pc; 1769 u8 stat; 1770 1771 stat = drive->hwif->INB(IDE_STATUS_REG); 1772 if (stat & SEEK_STAT) { 1773 if (stat & ERR_STAT) { 1774 /* Error detected */ 1775 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) 1776 printk(KERN_ERR "ide-tape: %s: I/O error, ", 1777 tape->name); 1778 /* Retry operation */ 1779 return idetape_retry_pc(drive); 1780 } 1781 pc->error = 0; 1782 if (tape->failed_pc == pc) 1783 tape->failed_pc = NULL; 1784 } else { 1785 pc->error = IDETAPE_ERROR_GENERAL; 1786 tape->failed_pc = NULL; 1787 } 1788 return pc->callback(drive); 1789} 1790 1791static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) 1792{ 1793 idetape_tape_t *tape = drive->driver_data; 1794 struct request *rq = HWGROUP(drive)->rq; 1795 int blocks = tape->pc->actually_transferred / tape->tape_block_size; 1796 1797 tape->avg_size += blocks * tape->tape_block_size; 1798 tape->insert_size += blocks * tape->tape_block_size; 1799 if (tape->insert_size > 1024 * 1024) 1800 tape->measure_insert_time = 1; 1801 if (tape->measure_insert_time) { 1802 tape->measure_insert_time = 0; 1803 tape->insert_time = jiffies; 1804 tape->insert_size = 0; 1805 } 1806 if (time_after(jiffies, tape->insert_time)) 1807 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 1808 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 1809 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; 1810 tape->avg_size = 0; 1811 tape->avg_time = jiffies; 1812 } 1813 1814#if IDETAPE_DEBUG_LOG 1815 if (tape->debug_level >= 4) 1816 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); 1817#endif /* IDETAPE_DEBUG_LOG */ 1818 1819 tape->first_frame_position += blocks; 1820 rq->current_nr_sectors -= blocks; 1821 1822 if (!tape->pc->error) 1823 idetape_end_request(drive, 1, 0); 1824 else 1825 idetape_end_request(drive, tape->pc->error, 0); 1826 return ide_stopped; 1827} 1828 1829static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 1830{ 1831 idetape_init_pc(pc); 1832 pc->c[0] = IDETAPE_READ_CMD; 1833 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 1834 pc->c[1] = 1; 1835 pc->callback = &idetape_rw_callback; 1836 pc->bh = bh; 1837 atomic_set(&bh->b_count, 0); 1838 pc->buffer = NULL; 1839 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 1840 if (pc->request_transfer == tape->stage_size) 1841 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 1842} 1843 1844static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 1845{ 1846 int size = 32768; 1847 struct idetape_bh *p = bh; 1848 1849 idetape_init_pc(pc); 1850 pc->c[0] = IDETAPE_READ_BUFFER_CMD; 1851 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; 1852 pc->c[7] = size >> 8; 1853 pc->c[8] = size & 0xff; 1854 pc->callback = &idetape_pc_callback; 1855 pc->bh = bh; 1856 atomic_set(&bh->b_count, 0); 1857 pc->buffer = NULL; 1858 while (p) { 1859 atomic_set(&p->b_count, 0); 1860 p = p->b_reqnext; 1861 } 1862 pc->request_transfer = pc->buffer_size = size; 1863} 1864 1865static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 1866{ 1867 idetape_init_pc(pc); 1868 pc->c[0] = IDETAPE_WRITE_CMD; 1869 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 1870 pc->c[1] = 1; 1871 pc->callback = &idetape_rw_callback; 1872 set_bit(PC_WRITING, &pc->flags); 1873 pc->bh = bh; 1874 pc->b_data = bh->b_data; 1875 pc->b_count = atomic_read(&bh->b_count); 1876 pc->buffer = NULL; 1877 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 1878 if (pc->request_transfer == tape->stage_size) 1879 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 1880} 1881 1882/* 1883 * idetape_do_request is our request handling function. 1884 */ 1885static ide_startstop_t idetape_do_request(ide_drive_t *drive, 1886 struct request *rq, sector_t block) 1887{ 1888 idetape_tape_t *tape = drive->driver_data; 1889 idetape_pc_t *pc = NULL; 1890 struct request *postponed_rq = tape->postponed_rq; 1891 u8 stat; 1892 1893#if IDETAPE_DEBUG_LOG 1894 if (tape->debug_level >= 2) 1895 printk(KERN_INFO "ide-tape: sector: %ld, " 1896 "nr_sectors: %ld, current_nr_sectors: %d\n", 1897 rq->sector, rq->nr_sectors, rq->current_nr_sectors); 1898#endif /* IDETAPE_DEBUG_LOG */ 1899 1900 if (!blk_special_request(rq)) { 1901 /* 1902 * We do not support buffer cache originated requests. 1903 */ 1904 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 1905 "request queue (%d)\n", drive->name, rq->cmd_type); 1906 ide_end_request(drive, 0, 0); 1907 return ide_stopped; 1908 } 1909 1910 /* 1911 * Retry a failed packet command 1912 */ 1913 if (tape->failed_pc != NULL && 1914 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1915 return idetape_issue_packet_command(drive, tape->failed_pc); 1916 } 1917 if (postponed_rq != NULL) 1918 if (rq != postponed_rq) { 1919 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 1920 "Two DSC requests were queued\n"); 1921 idetape_end_request(drive, 0, 0); 1922 return ide_stopped; 1923 } 1924 1925 tape->postponed_rq = NULL; 1926 1927 /* 1928 * If the tape is still busy, postpone our request and service 1929 * the other device meanwhile. 1930 */ 1931 stat = drive->hwif->INB(IDE_STATUS_REG); 1932 1933 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) 1934 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 1935 1936 if (drive->post_reset == 1) { 1937 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 1938 drive->post_reset = 0; 1939 } 1940 1941 if (tape->tape_still_time > 100 && tape->tape_still_time < 200) 1942 tape->measure_insert_time = 1; 1943 if (time_after(jiffies, tape->insert_time)) 1944 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 1945 calculate_speeds(drive); 1946 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && 1947 (stat & SEEK_STAT) == 0) { 1948 if (postponed_rq == NULL) { 1949 tape->dsc_polling_start = jiffies; 1950 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; 1951 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 1952 } else if (time_after(jiffies, tape->dsc_timeout)) { 1953 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 1954 tape->name); 1955 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 1956 idetape_media_access_finished(drive); 1957 return ide_stopped; 1958 } else { 1959 return ide_do_reset(drive); 1960 } 1961 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD)) 1962 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; 1963 idetape_postpone_request(drive); 1964 return ide_stopped; 1965 } 1966 if (rq->cmd[0] & REQ_IDETAPE_READ) { 1967 tape->buffer_head++; 1968 tape->postpone_cnt = 0; 1969 pc = idetape_next_pc_storage(drive); 1970 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 1971 goto out; 1972 } 1973 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 1974 tape->buffer_head++; 1975 tape->postpone_cnt = 0; 1976 pc = idetape_next_pc_storage(drive); 1977 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 1978 goto out; 1979 } 1980 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { 1981 tape->postpone_cnt = 0; 1982 pc = idetape_next_pc_storage(drive); 1983 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 1984 goto out; 1985 } 1986 if (rq->cmd[0] & REQ_IDETAPE_PC1) { 1987 pc = (idetape_pc_t *) rq->buffer; 1988 rq->cmd[0] &= ~(REQ_IDETAPE_PC1); 1989 rq->cmd[0] |= REQ_IDETAPE_PC2; 1990 goto out; 1991 } 1992 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 1993 idetape_media_access_finished(drive); 1994 return ide_stopped; 1995 } 1996 BUG(); 1997out: 1998 return idetape_issue_packet_command(drive, pc); 1999} 2000 2001/* 2002 * Pipeline related functions 2003 */ 2004static inline int idetape_pipeline_active (idetape_tape_t *tape) 2005{ 2006 int rc1, rc2; 2007 2008 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2009 rc2 = (tape->active_data_request != NULL); 2010 return rc1; 2011} 2012 2013/* 2014 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline 2015 * stage, along with all the necessary small buffers which together make 2016 * a buffer of size tape->stage_size (or a bit more). We attempt to 2017 * combine sequential pages as much as possible. 2018 * 2019 * Returns a pointer to the new allocated stage, or NULL if we 2020 * can't (or don't want to) allocate a stage. 2021 * 2022 * Pipeline stages are optional and are used to increase performance. 2023 * If we can't allocate them, we'll manage without them. 2024 */ 2025static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) 2026{ 2027 idetape_stage_t *stage; 2028 struct idetape_bh *prev_bh, *bh; 2029 int pages = tape->pages_per_stage; 2030 char *b_data = NULL; 2031 2032 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) 2033 return NULL; 2034 stage->next = NULL; 2035 2036 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 2037 if (bh == NULL) 2038 goto abort; 2039 bh->b_reqnext = NULL; 2040 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2041 goto abort; 2042 if (clear) 2043 memset(bh->b_data, 0, PAGE_SIZE); 2044 bh->b_size = PAGE_SIZE; 2045 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2046 2047 while (--pages) { 2048 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2049 goto abort; 2050 if (clear) 2051 memset(b_data, 0, PAGE_SIZE); 2052 if (bh->b_data == b_data + PAGE_SIZE) { 2053 bh->b_size += PAGE_SIZE; 2054 bh->b_data -= PAGE_SIZE; 2055 if (full) 2056 atomic_add(PAGE_SIZE, &bh->b_count); 2057 continue; 2058 } 2059 if (b_data == bh->b_data + bh->b_size) { 2060 bh->b_size += PAGE_SIZE; 2061 if (full) 2062 atomic_add(PAGE_SIZE, &bh->b_count); 2063 continue; 2064 } 2065 prev_bh = bh; 2066 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { 2067 free_page((unsigned long) b_data); 2068 goto abort; 2069 } 2070 bh->b_reqnext = NULL; 2071 bh->b_data = b_data; 2072 bh->b_size = PAGE_SIZE; 2073 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2074 prev_bh->b_reqnext = bh; 2075 } 2076 bh->b_size -= tape->excess_bh_size; 2077 if (full) 2078 atomic_sub(tape->excess_bh_size, &bh->b_count); 2079 return stage; 2080abort: 2081 __idetape_kfree_stage(stage); 2082 return NULL; 2083} 2084 2085static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) 2086{ 2087 idetape_stage_t *cache_stage = tape->cache_stage; 2088 2089#if IDETAPE_DEBUG_LOG 2090 if (tape->debug_level >= 4) 2091 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); 2092#endif /* IDETAPE_DEBUG_LOG */ 2093 2094 if (tape->nr_stages >= tape->max_stages) 2095 return NULL; 2096 if (cache_stage != NULL) { 2097 tape->cache_stage = NULL; 2098 return cache_stage; 2099 } 2100 return __idetape_kmalloc_stage(tape, 0, 0); 2101} 2102 2103static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) 2104{ 2105 struct idetape_bh *bh = tape->bh; 2106 int count; 2107 int ret = 0; 2108 2109 while (n) { 2110 if (bh == NULL) { 2111 printk(KERN_ERR "ide-tape: bh == NULL in " 2112 "idetape_copy_stage_from_user\n"); 2113 return 1; 2114 } 2115 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); 2116 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count)) 2117 ret = 1; 2118 n -= count; 2119 atomic_add(count, &bh->b_count); 2120 buf += count; 2121 if (atomic_read(&bh->b_count) == bh->b_size) { 2122 bh = bh->b_reqnext; 2123 if (bh) 2124 atomic_set(&bh->b_count, 0); 2125 } 2126 } 2127 tape->bh = bh; 2128 return ret; 2129} 2130 2131static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) 2132{ 2133 struct idetape_bh *bh = tape->bh; 2134 int count; 2135 int ret = 0; 2136 2137 while (n) { 2138 if (bh == NULL) { 2139 printk(KERN_ERR "ide-tape: bh == NULL in " 2140 "idetape_copy_stage_to_user\n"); 2141 return 1; 2142 } 2143 count = min(tape->b_count, n); 2144 if (copy_to_user(buf, tape->b_data, count)) 2145 ret = 1; 2146 n -= count; 2147 tape->b_data += count; 2148 tape->b_count -= count; 2149 buf += count; 2150 if (!tape->b_count) { 2151 tape->bh = bh = bh->b_reqnext; 2152 if (bh) { 2153 tape->b_data = bh->b_data; 2154 tape->b_count = atomic_read(&bh->b_count); 2155 } 2156 } 2157 } 2158 return ret; 2159} 2160 2161static void idetape_init_merge_stage (idetape_tape_t *tape) 2162{ 2163 struct idetape_bh *bh = tape->merge_stage->bh; 2164 2165 tape->bh = bh; 2166 if (tape->chrdev_direction == idetape_direction_write) 2167 atomic_set(&bh->b_count, 0); 2168 else { 2169 tape->b_data = bh->b_data; 2170 tape->b_count = atomic_read(&bh->b_count); 2171 } 2172} 2173 2174static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) 2175{ 2176 struct idetape_bh *tmp; 2177 2178 tmp = stage->bh; 2179 stage->bh = tape->merge_stage->bh; 2180 tape->merge_stage->bh = tmp; 2181 idetape_init_merge_stage(tape); 2182} 2183 2184/* 2185 * idetape_add_stage_tail adds a new stage at the end of the pipeline. 2186 */ 2187static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) 2188{ 2189 idetape_tape_t *tape = drive->driver_data; 2190 unsigned long flags; 2191 2192#if IDETAPE_DEBUG_LOG 2193 if (tape->debug_level >= 4) 2194 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); 2195#endif /* IDETAPE_DEBUG_LOG */ 2196 spin_lock_irqsave(&tape->spinlock, flags); 2197 stage->next = NULL; 2198 if (tape->last_stage != NULL) 2199 tape->last_stage->next=stage; 2200 else 2201 tape->first_stage = tape->next_stage=stage; 2202 tape->last_stage = stage; 2203 if (tape->next_stage == NULL) 2204 tape->next_stage = tape->last_stage; 2205 tape->nr_stages++; 2206 tape->nr_pending_stages++; 2207 spin_unlock_irqrestore(&tape->spinlock, flags); 2208} 2209 2210/* 2211 * idetape_wait_for_request installs a completion in a pending request 2212 * and sleeps until it is serviced. 2213 * 2214 * The caller should ensure that the request will not be serviced 2215 * before we install the completion (usually by disabling interrupts). 2216 */ 2217static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) 2218{ 2219 DECLARE_COMPLETION_ONSTACK(wait); 2220 idetape_tape_t *tape = drive->driver_data; 2221 2222 if (rq == NULL || !blk_special_request(rq)) { 2223 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); 2224 return; 2225 } 2226 rq->end_io_data = &wait; 2227 rq->end_io = blk_end_sync_rq; 2228 spin_unlock_irq(&tape->spinlock); 2229 wait_for_completion(&wait); 2230 /* The stage and its struct request have been deallocated */ 2231 spin_lock_irq(&tape->spinlock); 2232} 2233 2234static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) 2235{ 2236 idetape_tape_t *tape = drive->driver_data; 2237 idetape_read_position_result_t *result; 2238 2239#if IDETAPE_DEBUG_LOG 2240 if (tape->debug_level >= 4) 2241 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); 2242#endif /* IDETAPE_DEBUG_LOG */ 2243 2244 if (!tape->pc->error) { 2245 result = (idetape_read_position_result_t *) tape->pc->buffer; 2246#if IDETAPE_DEBUG_LOG 2247 if (tape->debug_level >= 2) 2248 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); 2249 if (tape->debug_level >= 2) 2250 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); 2251#endif /* IDETAPE_DEBUG_LOG */ 2252 if (result->bpu) { 2253 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); 2254 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2255 idetape_end_request(drive, 0, 0); 2256 } else { 2257#if IDETAPE_DEBUG_LOG 2258 if (tape->debug_level >= 2) 2259 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); 2260#endif /* IDETAPE_DEBUG_LOG */ 2261 tape->partition = result->partition; 2262 tape->first_frame_position = ntohl(result->first_block); 2263 tape->last_frame_position = ntohl(result->last_block); 2264 tape->blocks_in_buffer = result->blocks_in_buffer[2]; 2265 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2266 idetape_end_request(drive, 1, 0); 2267 } 2268 } else { 2269 idetape_end_request(drive, 0, 0); 2270 } 2271 return ide_stopped; 2272} 2273 2274/* 2275 * idetape_create_write_filemark_cmd will: 2276 * 2277 * 1. Write a filemark if write_filemark=1. 2278 * 2. Flush the device buffers without writing a filemark 2279 * if write_filemark=0. 2280 * 2281 */ 2282static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) 2283{ 2284 idetape_init_pc(pc); 2285 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; 2286 pc->c[4] = write_filemark; 2287 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2288 pc->callback = &idetape_pc_callback; 2289} 2290 2291static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) 2292{ 2293 idetape_init_pc(pc); 2294 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; 2295 pc->callback = &idetape_pc_callback; 2296} 2297 2298/* 2299 * idetape_queue_pc_tail is based on the following functions: 2300 * 2301 * ide_do_drive_cmd from ide.c 2302 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c 2303 * 2304 * We add a special packet command request to the tail of the request 2305 * queue, and wait for it to be serviced. 2306 * 2307 * This is not to be called from within the request handling part 2308 * of the driver ! We allocate here data in the stack, and it is valid 2309 * until the request is finished. This is not the case for the bottom 2310 * part of the driver, where we are always leaving the functions to wait 2311 * for an interrupt or a timer event. 2312 * 2313 * From the bottom part of the driver, we should allocate safe memory 2314 * using idetape_next_pc_storage and idetape_next_rq_storage, and add 2315 * the request to the request list without waiting for it to be serviced ! 2316 * In that case, we usually use idetape_queue_pc_head. 2317 */ 2318static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) 2319{ 2320 struct ide_tape_obj *tape = drive->driver_data; 2321 struct request rq; 2322 2323 idetape_init_rq(&rq, REQ_IDETAPE_PC1); 2324 rq.buffer = (char *) pc; 2325 rq.rq_disk = tape->disk; 2326 return ide_do_drive_cmd(drive, &rq, ide_wait); 2327} 2328 2329static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) 2330{ 2331 idetape_init_pc(pc); 2332 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; 2333 pc->c[4] = cmd; 2334 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2335 pc->callback = &idetape_pc_callback; 2336} 2337 2338static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 2339{ 2340 idetape_tape_t *tape = drive->driver_data; 2341 idetape_pc_t pc; 2342 int load_attempted = 0; 2343 2344 /* 2345 * Wait for the tape to become ready 2346 */ 2347 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 2348 timeout += jiffies; 2349 while (time_before(jiffies, timeout)) { 2350 idetape_create_test_unit_ready_cmd(&pc); 2351 if (!__idetape_queue_pc_tail(drive, &pc)) 2352 return 0; 2353 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 2354 || (tape->asc == 0x3A)) { /* no media */ 2355 if (load_attempted) 2356 return -ENOMEDIUM; 2357 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 2358 __idetape_queue_pc_tail(drive, &pc); 2359 load_attempted = 1; 2360 /* not about to be ready */ 2361 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 2362 (tape->ascq == 1 || tape->ascq == 8))) 2363 return -EIO; 2364 msleep(100); 2365 } 2366 return -EIO; 2367} 2368 2369static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) 2370{ 2371 return __idetape_queue_pc_tail(drive, pc); 2372} 2373 2374static int idetape_flush_tape_buffers (ide_drive_t *drive) 2375{ 2376 idetape_pc_t pc; 2377 int rc; 2378 2379 idetape_create_write_filemark_cmd(drive, &pc, 0); 2380 if ((rc = idetape_queue_pc_tail(drive, &pc))) 2381 return rc; 2382 idetape_wait_ready(drive, 60 * 5 * HZ); 2383 return 0; 2384} 2385 2386static void idetape_create_read_position_cmd (idetape_pc_t *pc) 2387{ 2388 idetape_init_pc(pc); 2389 pc->c[0] = IDETAPE_READ_POSITION_CMD; 2390 pc->request_transfer = 20; 2391 pc->callback = &idetape_read_position_callback; 2392} 2393 2394static int idetape_read_position (ide_drive_t *drive) 2395{ 2396 idetape_tape_t *tape = drive->driver_data; 2397 idetape_pc_t pc; 2398 int position; 2399 2400#if IDETAPE_DEBUG_LOG 2401 if (tape->debug_level >= 4) 2402 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); 2403#endif /* IDETAPE_DEBUG_LOG */ 2404 2405 idetape_create_read_position_cmd(&pc); 2406 if (idetape_queue_pc_tail(drive, &pc)) 2407 return -1; 2408 position = tape->first_frame_position; 2409 return position; 2410} 2411 2412static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) 2413{ 2414 idetape_init_pc(pc); 2415 pc->c[0] = IDETAPE_LOCATE_CMD; 2416 pc->c[1] = 2; 2417 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); 2418 pc->c[8] = partition; 2419 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2420 pc->callback = &idetape_pc_callback; 2421} 2422 2423static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) 2424{ 2425 idetape_tape_t *tape = drive->driver_data; 2426 2427 /* device supports locking according to capabilities page */ 2428 if (!(tape->caps[6] & 0x01)) 2429 return 0; 2430 2431 idetape_init_pc(pc); 2432 pc->c[0] = IDETAPE_PREVENT_CMD; 2433 pc->c[4] = prevent; 2434 pc->callback = &idetape_pc_callback; 2435 return 1; 2436} 2437 2438static int __idetape_discard_read_pipeline (ide_drive_t *drive) 2439{ 2440 idetape_tape_t *tape = drive->driver_data; 2441 unsigned long flags; 2442 int cnt; 2443 2444 if (tape->chrdev_direction != idetape_direction_read) 2445 return 0; 2446 2447 /* Remove merge stage. */ 2448 cnt = tape->merge_stage_size / tape->tape_block_size; 2449 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 2450 ++cnt; /* Filemarks count as 1 sector */ 2451 tape->merge_stage_size = 0; 2452 if (tape->merge_stage != NULL) { 2453 __idetape_kfree_stage(tape->merge_stage); 2454 tape->merge_stage = NULL; 2455 } 2456 2457 /* Clear pipeline flags. */ 2458 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 2459 tape->chrdev_direction = idetape_direction_none; 2460 2461 /* Remove pipeline stages. */ 2462 if (tape->first_stage == NULL) 2463 return 0; 2464 2465 spin_lock_irqsave(&tape->spinlock, flags); 2466 tape->next_stage = NULL; 2467 if (idetape_pipeline_active(tape)) 2468 idetape_wait_for_request(drive, tape->active_data_request); 2469 spin_unlock_irqrestore(&tape->spinlock, flags); 2470 2471 while (tape->first_stage != NULL) { 2472 struct request *rq_ptr = &tape->first_stage->rq; 2473 2474 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; 2475 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 2476 ++cnt; 2477 idetape_remove_stage_head(drive); 2478 } 2479 tape->nr_pending_stages = 0; 2480 tape->max_stages = tape->min_pipeline; 2481 return cnt; 2482} 2483 2484/* 2485 * idetape_position_tape positions the tape to the requested block 2486 * using the LOCATE packet command. A READ POSITION command is then 2487 * issued to check where we are positioned. 2488 * 2489 * Like all higher level operations, we queue the commands at the tail 2490 * of the request queue and wait for their completion. 2491 * 2492 */ 2493static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) 2494{ 2495 idetape_tape_t *tape = drive->driver_data; 2496 int retval; 2497 idetape_pc_t pc; 2498 2499 if (tape->chrdev_direction == idetape_direction_read) 2500 __idetape_discard_read_pipeline(drive); 2501 idetape_wait_ready(drive, 60 * 5 * HZ); 2502 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 2503 retval = idetape_queue_pc_tail(drive, &pc); 2504 if (retval) 2505 return (retval); 2506 2507 idetape_create_read_position_cmd(&pc); 2508 return (idetape_queue_pc_tail(drive, &pc)); 2509} 2510 2511static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) 2512{ 2513 idetape_tape_t *tape = drive->driver_data; 2514 int cnt; 2515 int seek, position; 2516 2517 cnt = __idetape_discard_read_pipeline(drive); 2518 if (restore_position) { 2519 position = idetape_read_position(drive); 2520 seek = position > cnt ? position - cnt : 0; 2521 if (idetape_position_tape(drive, seek, 0, 0)) { 2522 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); 2523 return; 2524 } 2525 } 2526} 2527 2528/* 2529 * idetape_queue_rw_tail generates a read/write request for the block 2530 * device interface and wait for it to be serviced. 2531 */ 2532static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) 2533{ 2534 idetape_tape_t *tape = drive->driver_data; 2535 struct request rq; 2536 2537#if IDETAPE_DEBUG_LOG 2538 if (tape->debug_level >= 2) 2539 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); 2540#endif /* IDETAPE_DEBUG_LOG */ 2541 if (idetape_pipeline_active(tape)) { 2542 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); 2543 return (0); 2544 } 2545 2546 idetape_init_rq(&rq, cmd); 2547 rq.rq_disk = tape->disk; 2548 rq.special = (void *)bh; 2549 rq.sector = tape->first_frame_position; 2550 rq.nr_sectors = rq.current_nr_sectors = blocks; 2551 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 2552 2553 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) 2554 return 0; 2555 2556 if (tape->merge_stage) 2557 idetape_init_merge_stage(tape); 2558 if (rq.errors == IDETAPE_ERROR_GENERAL) 2559 return -EIO; 2560 return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); 2561} 2562 2563/* 2564 * idetape_insert_pipeline_into_queue is used to start servicing the 2565 * pipeline stages, starting from tape->next_stage. 2566 */ 2567static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) 2568{ 2569 idetape_tape_t *tape = drive->driver_data; 2570 2571 if (tape->next_stage == NULL) 2572 return; 2573 if (!idetape_pipeline_active(tape)) { 2574 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2575 idetape_active_next_stage(drive); 2576 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 2577 } 2578} 2579 2580static void idetape_create_inquiry_cmd (idetape_pc_t *pc) 2581{ 2582 idetape_init_pc(pc); 2583 pc->c[0] = IDETAPE_INQUIRY_CMD; 2584 pc->c[4] = pc->request_transfer = 254; 2585 pc->callback = &idetape_pc_callback; 2586} 2587 2588static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) 2589{ 2590 idetape_init_pc(pc); 2591 pc->c[0] = IDETAPE_REWIND_CMD; 2592 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2593 pc->callback = &idetape_pc_callback; 2594} 2595 2596static void idetape_create_erase_cmd (idetape_pc_t *pc) 2597{ 2598 idetape_init_pc(pc); 2599 pc->c[0] = IDETAPE_ERASE_CMD; 2600 pc->c[1] = 1; 2601 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2602 pc->callback = &idetape_pc_callback; 2603} 2604 2605static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) 2606{ 2607 idetape_init_pc(pc); 2608 pc->c[0] = IDETAPE_SPACE_CMD; 2609 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); 2610 pc->c[1] = cmd; 2611 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2612 pc->callback = &idetape_pc_callback; 2613} 2614 2615static void idetape_wait_first_stage (ide_drive_t *drive) 2616{ 2617 idetape_tape_t *tape = drive->driver_data; 2618 unsigned long flags; 2619 2620 if (tape->first_stage == NULL) 2621 return; 2622 spin_lock_irqsave(&tape->spinlock, flags); 2623 if (tape->active_stage == tape->first_stage) 2624 idetape_wait_for_request(drive, tape->active_data_request); 2625 spin_unlock_irqrestore(&tape->spinlock, flags); 2626} 2627 2628/* 2629 * idetape_add_chrdev_write_request tries to add a character device 2630 * originated write request to our pipeline. In case we don't succeed, 2631 * we revert to non-pipelined operation mode for this request. 2632 * 2633 * 1. Try to allocate a new pipeline stage. 2634 * 2. If we can't, wait for more and more requests to be serviced 2635 * and try again each time. 2636 * 3. If we still can't allocate a stage, fallback to 2637 * non-pipelined operation mode for this request. 2638 */ 2639static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) 2640{ 2641 idetape_tape_t *tape = drive->driver_data; 2642 idetape_stage_t *new_stage; 2643 unsigned long flags; 2644 struct request *rq; 2645 2646#if IDETAPE_DEBUG_LOG 2647 if (tape->debug_level >= 3) 2648 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); 2649#endif /* IDETAPE_DEBUG_LOG */ 2650 2651 /* 2652 * Attempt to allocate a new stage. 2653 * Pay special attention to possible race conditions. 2654 */ 2655 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { 2656 spin_lock_irqsave(&tape->spinlock, flags); 2657 if (idetape_pipeline_active(tape)) { 2658 idetape_wait_for_request(drive, tape->active_data_request); 2659 spin_unlock_irqrestore(&tape->spinlock, flags); 2660 } else { 2661 spin_unlock_irqrestore(&tape->spinlock, flags); 2662 idetape_insert_pipeline_into_queue(drive); 2663 if (idetape_pipeline_active(tape)) 2664 continue; 2665 /* 2666 * Linux is short on memory. Fallback to 2667 * non-pipelined operation mode for this request. 2668 */ 2669 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 2670 } 2671 } 2672 rq = &new_stage->rq; 2673 idetape_init_rq(rq, REQ_IDETAPE_WRITE); 2674 /* Doesn't actually matter - We always assume sequential access */ 2675 rq->sector = tape->first_frame_position; 2676 rq->nr_sectors = rq->current_nr_sectors = blocks; 2677 2678 idetape_switch_buffers(tape, new_stage); 2679 idetape_add_stage_tail(drive, new_stage); 2680 tape->pipeline_head++; 2681 calculate_speeds(drive); 2682 2683 /* 2684 * Estimate whether the tape has stopped writing by checking 2685 * if our write pipeline is currently empty. If we are not 2686 * writing anymore, wait for the pipeline to be full enough 2687 * (90%) before starting to service requests, so that we will 2688 * be able to keep up with the higher speeds of the tape. 2689 */ 2690 if (!idetape_pipeline_active(tape)) { 2691 if (tape->nr_stages >= tape->max_stages * 9 / 10 || 2692 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { 2693 tape->measure_insert_time = 1; 2694 tape->insert_time = jiffies; 2695 tape->insert_size = 0; 2696 tape->insert_speed = 0; 2697 idetape_insert_pipeline_into_queue(drive); 2698 } 2699 } 2700 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 2701 /* Return a deferred error */ 2702 return -EIO; 2703 return blocks; 2704} 2705 2706/* 2707 * idetape_wait_for_pipeline will wait until all pending pipeline 2708 * requests are serviced. Typically called on device close. 2709 */ 2710static void idetape_wait_for_pipeline (ide_drive_t *drive) 2711{ 2712 idetape_tape_t *tape = drive->driver_data; 2713 unsigned long flags; 2714 2715 while (tape->next_stage || idetape_pipeline_active(tape)) { 2716 idetape_insert_pipeline_into_queue(drive); 2717 spin_lock_irqsave(&tape->spinlock, flags); 2718 if (idetape_pipeline_active(tape)) 2719 idetape_wait_for_request(drive, tape->active_data_request); 2720 spin_unlock_irqrestore(&tape->spinlock, flags); 2721 } 2722} 2723 2724static void idetape_empty_write_pipeline (ide_drive_t *drive) 2725{ 2726 idetape_tape_t *tape = drive->driver_data; 2727 int blocks, min; 2728 struct idetape_bh *bh; 2729 2730 if (tape->chrdev_direction != idetape_direction_write) { 2731 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); 2732 return; 2733 } 2734 if (tape->merge_stage_size > tape->stage_size) { 2735 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 2736 tape->merge_stage_size = tape->stage_size; 2737 } 2738 if (tape->merge_stage_size) { 2739 blocks = tape->merge_stage_size / tape->tape_block_size; 2740 if (tape->merge_stage_size % tape->tape_block_size) { 2741 unsigned int i; 2742 2743 blocks++; 2744 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; 2745 bh = tape->bh->b_reqnext; 2746 while (bh) { 2747 atomic_set(&bh->b_count, 0); 2748 bh = bh->b_reqnext; 2749 } 2750 bh = tape->bh; 2751 while (i) { 2752 if (bh == NULL) { 2753 2754 printk(KERN_INFO "ide-tape: bug, bh NULL\n"); 2755 break; 2756 } 2757 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); 2758 memset(bh->b_data + atomic_read(&bh->b_count), 0, min); 2759 atomic_add(min, &bh->b_count); 2760 i -= min; 2761 bh = bh->b_reqnext; 2762 } 2763 } 2764 (void) idetape_add_chrdev_write_request(drive, blocks); 2765 tape->merge_stage_size = 0; 2766 } 2767 idetape_wait_for_pipeline(drive); 2768 if (tape->merge_stage != NULL) { 2769 __idetape_kfree_stage(tape->merge_stage); 2770 tape->merge_stage = NULL; 2771 } 2772 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 2773 tape->chrdev_direction = idetape_direction_none; 2774 2775 /* 2776 * On the next backup, perform the feedback loop again. 2777 * (I don't want to keep sense information between backups, 2778 * as some systems are constantly on, and the system load 2779 * can be totally different on the next backup). 2780 */ 2781 tape->max_stages = tape->min_pipeline; 2782 if (tape->first_stage != NULL || 2783 tape->next_stage != NULL || 2784 tape->last_stage != NULL || 2785 tape->nr_stages != 0) { 2786 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " 2787 "first_stage %p, next_stage %p, " 2788 "last_stage %p, nr_stages %d\n", 2789 tape->first_stage, tape->next_stage, 2790 tape->last_stage, tape->nr_stages); 2791 } 2792} 2793 2794static void idetape_restart_speed_control (ide_drive_t *drive) 2795{ 2796 idetape_tape_t *tape = drive->driver_data; 2797 2798 tape->restart_speed_control_req = 0; 2799 tape->pipeline_head = 0; 2800 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; 2801 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; 2802 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; 2803 tape->uncontrolled_pipeline_head_speed = 0; 2804 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; 2805 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; 2806} 2807 2808static int idetape_initiate_read (ide_drive_t *drive, int max_stages) 2809{ 2810 idetape_tape_t *tape = drive->driver_data; 2811 idetape_stage_t *new_stage; 2812 struct request rq; 2813 int bytes_read; 2814 u16 blocks = *(u16 *)&tape->caps[12]; 2815 2816 /* Initialize read operation */ 2817 if (tape->chrdev_direction != idetape_direction_read) { 2818 if (tape->chrdev_direction == idetape_direction_write) { 2819 idetape_empty_write_pipeline(drive); 2820 idetape_flush_tape_buffers(drive); 2821 } 2822 if (tape->merge_stage || tape->merge_stage_size) { 2823 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); 2824 tape->merge_stage_size = 0; 2825 } 2826 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 2827 return -ENOMEM; 2828 tape->chrdev_direction = idetape_direction_read; 2829 2830 /* 2831 * Issue a read 0 command to ensure that DSC handshake 2832 * is switched from completion mode to buffer available 2833 * mode. 2834 * No point in issuing this if DSC overlap isn't supported, 2835 * some drives (Seagate STT3401A) will return an error. 2836 */ 2837 if (drive->dsc_overlap) { 2838 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); 2839 if (bytes_read < 0) { 2840 __idetape_kfree_stage(tape->merge_stage); 2841 tape->merge_stage = NULL; 2842 tape->chrdev_direction = idetape_direction_none; 2843 return bytes_read; 2844 } 2845 } 2846 } 2847 if (tape->restart_speed_control_req) 2848 idetape_restart_speed_control(drive); 2849 idetape_init_rq(&rq, REQ_IDETAPE_READ); 2850 rq.sector = tape->first_frame_position; 2851 rq.nr_sectors = rq.current_nr_sectors = blocks; 2852 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && 2853 tape->nr_stages < max_stages) { 2854 new_stage = idetape_kmalloc_stage(tape); 2855 while (new_stage != NULL) { 2856 new_stage->rq = rq; 2857 idetape_add_stage_tail(drive, new_stage); 2858 if (tape->nr_stages >= max_stages) 2859 break; 2860 new_stage = idetape_kmalloc_stage(tape); 2861 } 2862 } 2863 if (!idetape_pipeline_active(tape)) { 2864 if (tape->nr_pending_stages >= 3 * max_stages / 4) { 2865 tape->measure_insert_time = 1; 2866 tape->insert_time = jiffies; 2867 tape->insert_size = 0; 2868 tape->insert_speed = 0; 2869 idetape_insert_pipeline_into_queue(drive); 2870 } 2871 } 2872 return 0; 2873} 2874 2875/* 2876 * idetape_add_chrdev_read_request is called from idetape_chrdev_read 2877 * to service a character device read request and add read-ahead 2878 * requests to our pipeline. 2879 */ 2880static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) 2881{ 2882 idetape_tape_t *tape = drive->driver_data; 2883 unsigned long flags; 2884 struct request *rq_ptr; 2885 int bytes_read; 2886 2887#if IDETAPE_DEBUG_LOG 2888 if (tape->debug_level >= 4) 2889 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); 2890#endif /* IDETAPE_DEBUG_LOG */ 2891 2892 /* 2893 * If we are at a filemark, return a read length of 0 2894 */ 2895 if (test_bit(IDETAPE_FILEMARK, &tape->flags)) 2896 return 0; 2897 2898 /* 2899 * Wait for the next block to be available at the head 2900 * of the pipeline 2901 */ 2902 idetape_initiate_read(drive, tape->max_stages); 2903 if (tape->first_stage == NULL) { 2904 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 2905 return 0; 2906 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); 2907 } 2908 idetape_wait_first_stage(drive); 2909 rq_ptr = &tape->first_stage->rq; 2910 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); 2911 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; 2912 2913 2914 if (rq_ptr->errors == IDETAPE_ERROR_EOD) 2915 return 0; 2916 else { 2917 idetape_switch_buffers(tape, tape->first_stage); 2918 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 2919 set_bit(IDETAPE_FILEMARK, &tape->flags); 2920 spin_lock_irqsave(&tape->spinlock, flags); 2921 idetape_remove_stage_head(drive); 2922 spin_unlock_irqrestore(&tape->spinlock, flags); 2923 tape->pipeline_head++; 2924 calculate_speeds(drive); 2925 } 2926 if (bytes_read > blocks * tape->tape_block_size) { 2927 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); 2928 bytes_read = blocks * tape->tape_block_size; 2929 } 2930 return (bytes_read); 2931} 2932 2933static void idetape_pad_zeros (ide_drive_t *drive, int bcount) 2934{ 2935 idetape_tape_t *tape = drive->driver_data; 2936 struct idetape_bh *bh; 2937 int blocks; 2938 2939 while (bcount) { 2940 unsigned int count; 2941 2942 bh = tape->merge_stage->bh; 2943 count = min(tape->stage_size, bcount); 2944 bcount -= count; 2945 blocks = count / tape->tape_block_size; 2946 while (count) { 2947 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); 2948 memset(bh->b_data, 0, atomic_read(&bh->b_count)); 2949 count -= atomic_read(&bh->b_count); 2950 bh = bh->b_reqnext; 2951 } 2952 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 2953 } 2954} 2955 2956static int idetape_pipeline_size (ide_drive_t *drive) 2957{ 2958 idetape_tape_t *tape = drive->driver_data; 2959 idetape_stage_t *stage; 2960 struct request *rq; 2961 int size = 0; 2962 2963 idetape_wait_for_pipeline(drive); 2964 stage = tape->first_stage; 2965 while (stage != NULL) { 2966 rq = &stage->rq; 2967 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); 2968 if (rq->errors == IDETAPE_ERROR_FILEMARK) 2969 size += tape->tape_block_size; 2970 stage = stage->next; 2971 } 2972 size += tape->merge_stage_size; 2973 return size; 2974} 2975 2976/* 2977 * Rewinds the tape to the Beginning Of the current Partition (BOP). 2978 * 2979 * We currently support only one partition. 2980 */ 2981static int idetape_rewind_tape (ide_drive_t *drive) 2982{ 2983 int retval; 2984 idetape_pc_t pc; 2985#if IDETAPE_DEBUG_LOG 2986 idetape_tape_t *tape = drive->driver_data; 2987 if (tape->debug_level >= 2) 2988 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); 2989#endif /* IDETAPE_DEBUG_LOG */ 2990 2991 idetape_create_rewind_cmd(drive, &pc); 2992 retval = idetape_queue_pc_tail(drive, &pc); 2993 if (retval) 2994 return retval; 2995 2996 idetape_create_read_position_cmd(&pc); 2997 retval = idetape_queue_pc_tail(drive, &pc); 2998 if (retval) 2999 return retval; 3000 return 0; 3001} 3002 3003/* 3004 * Our special ide-tape ioctl's. 3005 * 3006 * Currently there aren't any ioctl's. 3007 * mtio.h compatible commands should be issued to the character device 3008 * interface. 3009 */ 3010static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) 3011{ 3012 idetape_tape_t *tape = drive->driver_data; 3013 idetape_config_t config; 3014 void __user *argp = (void __user *)arg; 3015 3016#if IDETAPE_DEBUG_LOG 3017 if (tape->debug_level >= 4) 3018 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); 3019#endif /* IDETAPE_DEBUG_LOG */ 3020 switch (cmd) { 3021 case 0x0340: 3022 if (copy_from_user(&config, argp, sizeof (idetape_config_t))) 3023 return -EFAULT; 3024 tape->best_dsc_rw_frequency = config.dsc_rw_frequency; 3025 tape->max_stages = config.nr_stages; 3026 break; 3027 case 0x0350: 3028 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; 3029 config.nr_stages = tape->max_stages; 3030 if (copy_to_user(argp, &config, sizeof (idetape_config_t))) 3031 return -EFAULT; 3032 break; 3033 default: 3034 return -EIO; 3035 } 3036 return 0; 3037} 3038 3039/* 3040 * idetape_space_over_filemarks is now a bit more complicated than just 3041 * passing the command to the tape since we may have crossed some 3042 * filemarks during our pipelined read-ahead mode. 3043 * 3044 * As a minor side effect, the pipeline enables us to support MTFSFM when 3045 * the filemark is in our internal pipeline even if the tape doesn't 3046 * support spacing over filemarks in the reverse direction. 3047 */ 3048static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) 3049{ 3050 idetape_tape_t *tape = drive->driver_data; 3051 idetape_pc_t pc; 3052 unsigned long flags; 3053 int retval,count=0; 3054 int sprev = !!(tape->caps[4] & 0x20); 3055 3056 if (mt_count == 0) 3057 return 0; 3058 if (MTBSF == mt_op || MTBSFM == mt_op) { 3059 if (!sprev) 3060 return -EIO; 3061 mt_count = - mt_count; 3062 } 3063 3064 if (tape->chrdev_direction == idetape_direction_read) { 3065 /* 3066 * We have a read-ahead buffer. Scan it for crossed 3067 * filemarks. 3068 */ 3069 tape->merge_stage_size = 0; 3070 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 3071 ++count; 3072 while (tape->first_stage != NULL) { 3073 if (count == mt_count) { 3074 if (mt_op == MTFSFM) 3075 set_bit(IDETAPE_FILEMARK, &tape->flags); 3076 return 0; 3077 } 3078 spin_lock_irqsave(&tape->spinlock, flags); 3079 if (tape->first_stage == tape->active_stage) { 3080 /* 3081 * We have reached the active stage in the read pipeline. 3082 * There is no point in allowing the drive to continue 3083 * reading any farther, so we stop the pipeline. 3084 * 3085 * This section should be moved to a separate subroutine, 3086 * because a similar function is performed in 3087 * __idetape_discard_read_pipeline(), for example. 3088 */ 3089 tape->next_stage = NULL; 3090 spin_unlock_irqrestore(&tape->spinlock, flags); 3091 idetape_wait_first_stage(drive); 3092 tape->next_stage = tape->first_stage->next; 3093 } else 3094 spin_unlock_irqrestore(&tape->spinlock, flags); 3095 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) 3096 ++count; 3097 idetape_remove_stage_head(drive); 3098 } 3099 idetape_discard_read_pipeline(drive, 0); 3100 } 3101 3102 /* 3103 * The filemark was not found in our internal pipeline. 3104 * Now we can issue the space command. 3105 */ 3106 switch (mt_op) { 3107 case MTFSF: 3108 case MTBSF: 3109 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); 3110 return (idetape_queue_pc_tail(drive, &pc)); 3111 case MTFSFM: 3112 case MTBSFM: 3113 if (!sprev) 3114 return (-EIO); 3115 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); 3116 if (retval) return (retval); 3117 count = (MTBSFM == mt_op ? 1 : -1); 3118 return (idetape_space_over_filemarks(drive, MTFSF, count)); 3119 default: 3120 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); 3121 return (-EIO); 3122 } 3123} 3124 3125 3126/* 3127 * Our character device read / write functions. 3128 * 3129 * The tape is optimized to maximize throughput when it is transferring 3130 * an integral number of the "continuous transfer limit", which is 3131 * a parameter of the specific tape (26 KB on my particular tape). 3132 * (32 kB for Onstream) 3133 * 3134 * As of version 1.3 of the driver, the character device provides an 3135 * abstract continuous view of the media - any mix of block sizes (even 1 3136 * byte) on the same backup/restore procedure is supported. The driver 3137 * will internally convert the requests to the recommended transfer unit, 3138 * so that an unmatch between the user's block size to the recommended 3139 * size will only result in a (slightly) increased driver overhead, but 3140 * will no longer hit performance. 3141 * This is not applicable to Onstream. 3142 */ 3143static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, 3144 size_t count, loff_t *ppos) 3145{ 3146 struct ide_tape_obj *tape = ide_tape_f(file); 3147 ide_drive_t *drive = tape->drive; 3148 ssize_t bytes_read,temp, actually_read = 0, rc; 3149 ssize_t ret = 0; 3150 u16 ctl = *(u16 *)&tape->caps[12]; 3151 3152#if IDETAPE_DEBUG_LOG 3153 if (tape->debug_level >= 3) 3154 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); 3155#endif /* IDETAPE_DEBUG_LOG */ 3156 3157 if (tape->chrdev_direction != idetape_direction_read) { 3158 if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) 3159 if (count > tape->tape_block_size && 3160 (count % tape->tape_block_size) == 0) 3161 tape->user_bs_factor = count / tape->tape_block_size; 3162 } 3163 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) 3164 return rc; 3165 if (count == 0) 3166 return (0); 3167 if (tape->merge_stage_size) { 3168 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); 3169 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read)) 3170 ret = -EFAULT; 3171 buf += actually_read; 3172 tape->merge_stage_size -= actually_read; 3173 count -= actually_read; 3174 } 3175 while (count >= tape->stage_size) { 3176 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 3177 if (bytes_read <= 0) 3178 goto finish; 3179 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read)) 3180 ret = -EFAULT; 3181 buf += bytes_read; 3182 count -= bytes_read; 3183 actually_read += bytes_read; 3184 } 3185 if (count) { 3186 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 3187 if (bytes_read <= 0) 3188 goto finish; 3189 temp = min((unsigned long)count, (unsigned long)bytes_read); 3190 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp)) 3191 ret = -EFAULT; 3192 actually_read += temp; 3193 tape->merge_stage_size = bytes_read-temp; 3194 } 3195finish: 3196 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { 3197#if IDETAPE_DEBUG_LOG 3198 if (tape->debug_level >= 2) 3199 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); 3200#endif 3201 idetape_space_over_filemarks(drive, MTFSF, 1); 3202 return 0; 3203 } 3204 3205 return (ret) ? ret : actually_read; 3206} 3207 3208static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, 3209 size_t count, loff_t *ppos) 3210{ 3211 struct ide_tape_obj *tape = ide_tape_f(file); 3212 ide_drive_t *drive = tape->drive; 3213 ssize_t actually_written = 0; 3214 ssize_t ret = 0; 3215 u16 ctl = *(u16 *)&tape->caps[12]; 3216 3217 /* The drive is write protected. */ 3218 if (tape->write_prot) 3219 return -EACCES; 3220 3221#if IDETAPE_DEBUG_LOG 3222 if (tape->debug_level >= 3) 3223 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " 3224 "count %Zd\n", count); 3225#endif /* IDETAPE_DEBUG_LOG */ 3226 3227 /* Initialize write operation */ 3228 if (tape->chrdev_direction != idetape_direction_write) { 3229 if (tape->chrdev_direction == idetape_direction_read) 3230 idetape_discard_read_pipeline(drive, 1); 3231 if (tape->merge_stage || tape->merge_stage_size) { 3232 printk(KERN_ERR "ide-tape: merge_stage_size " 3233 "should be 0 now\n"); 3234 tape->merge_stage_size = 0; 3235 } 3236 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 3237 return -ENOMEM; 3238 tape->chrdev_direction = idetape_direction_write; 3239 idetape_init_merge_stage(tape); 3240 3241 /* 3242 * Issue a write 0 command to ensure that DSC handshake 3243 * is switched from completion mode to buffer available 3244 * mode. 3245 * No point in issuing this if DSC overlap isn't supported, 3246 * some drives (Seagate STT3401A) will return an error. 3247 */ 3248 if (drive->dsc_overlap) { 3249 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); 3250 if (retval < 0) { 3251 __idetape_kfree_stage(tape->merge_stage); 3252 tape->merge_stage = NULL; 3253 tape->chrdev_direction = idetape_direction_none; 3254 return retval; 3255 } 3256 } 3257 } 3258 if (count == 0) 3259 return (0); 3260 if (tape->restart_speed_control_req) 3261 idetape_restart_speed_control(drive); 3262 if (tape->merge_stage_size) { 3263 if (tape->merge_stage_size >= tape->stage_size) { 3264 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); 3265 tape->merge_stage_size = 0; 3266 } 3267 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); 3268 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written)) 3269 ret = -EFAULT; 3270 buf += actually_written; 3271 tape->merge_stage_size += actually_written; 3272 count -= actually_written; 3273 3274 if (tape->merge_stage_size == tape->stage_size) { 3275 ssize_t retval; 3276 tape->merge_stage_size = 0; 3277 retval = idetape_add_chrdev_write_request(drive, ctl); 3278 if (retval <= 0) 3279 return (retval); 3280 } 3281 } 3282 while (count >= tape->stage_size) { 3283 ssize_t retval; 3284 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size)) 3285 ret = -EFAULT; 3286 buf += tape->stage_size; 3287 count -= tape->stage_size; 3288 retval = idetape_add_chrdev_write_request(drive, ctl); 3289 actually_written += tape->stage_size; 3290 if (retval <= 0) 3291 return (retval); 3292 } 3293 if (count) { 3294 actually_written += count; 3295 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count)) 3296 ret = -EFAULT; 3297 tape->merge_stage_size += count; 3298 } 3299 return (ret) ? ret : actually_written; 3300} 3301 3302static int idetape_write_filemark (ide_drive_t *drive) 3303{ 3304 idetape_pc_t pc; 3305 3306 /* Write a filemark */ 3307 idetape_create_write_filemark_cmd(drive, &pc, 1); 3308 if (idetape_queue_pc_tail(drive, &pc)) { 3309 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 3310 return -EIO; 3311 } 3312 return 0; 3313} 3314 3315/* 3316 * idetape_mtioctop is called from idetape_chrdev_ioctl when 3317 * the general mtio MTIOCTOP ioctl is requested. 3318 * 3319 * We currently support the following mtio.h operations: 3320 * 3321 * MTFSF - Space over mt_count filemarks in the positive direction. 3322 * The tape is positioned after the last spaced filemark. 3323 * 3324 * MTFSFM - Same as MTFSF, but the tape is positioned before the 3325 * last filemark. 3326 * 3327 * MTBSF - Steps background over mt_count filemarks, tape is 3328 * positioned before the last filemark. 3329 * 3330 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. 3331 * 3332 * Note: 3333 * 3334 * MTBSF and MTBSFM are not supported when the tape doesn't 3335 * support spacing over filemarks in the reverse direction. 3336 * In this case, MTFSFM is also usually not supported (it is 3337 * supported in the rare case in which we crossed the filemark 3338 * during our read-ahead pipelined operation mode). 3339 * 3340 * MTWEOF - Writes mt_count filemarks. Tape is positioned after 3341 * the last written filemark. 3342 * 3343 * MTREW - Rewinds tape. 3344 * 3345 * MTLOAD - Loads the tape. 3346 * 3347 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and 3348 * MTUNLOAD prevents further access until the media is replaced. 3349 * 3350 * MTNOP - Flushes tape buffers. 3351 * 3352 * MTRETEN - Retension media. This typically consists of one end 3353 * to end pass on the media. 3354 * 3355 * MTEOM - Moves to the end of recorded data. 3356 * 3357 * MTERASE - Erases tape. 3358 * 3359 * MTSETBLK - Sets the user block size to mt_count bytes. If 3360 * mt_count is 0, we will attempt to autodetect 3361 * the block size. 3362 * 3363 * MTSEEK - Positions the tape in a specific block number, where 3364 * each block is assumed to contain which user_block_size 3365 * bytes. 3366 * 3367 * MTSETPART - Switches to another tape partition. 3368 * 3369 * MTLOCK - Locks the tape door. 3370 * 3371 * MTUNLOCK - Unlocks the tape door. 3372 * 3373 * The following commands are currently not supported: 3374 * 3375 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, 3376 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. 3377 */ 3378static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) 3379{ 3380 idetape_tape_t *tape = drive->driver_data; 3381 idetape_pc_t pc; 3382 int i,retval; 3383 3384#if IDETAPE_DEBUG_LOG 3385 if (tape->debug_level >= 1) 3386 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " 3387 "mt_op=%d, mt_count=%d\n", mt_op, mt_count); 3388#endif /* IDETAPE_DEBUG_LOG */ 3389 /* 3390 * Commands which need our pipelined read-ahead stages. 3391 */ 3392 switch (mt_op) { 3393 case MTFSF: 3394 case MTFSFM: 3395 case MTBSF: 3396 case MTBSFM: 3397 if (!mt_count) 3398 return (0); 3399 return (idetape_space_over_filemarks(drive,mt_op,mt_count)); 3400 default: 3401 break; 3402 } 3403 switch (mt_op) { 3404 case MTWEOF: 3405 if (tape->write_prot) 3406 return -EACCES; 3407 idetape_discard_read_pipeline(drive, 1); 3408 for (i = 0; i < mt_count; i++) { 3409 retval = idetape_write_filemark(drive); 3410 if (retval) 3411 return retval; 3412 } 3413 return (0); 3414 case MTREW: 3415 idetape_discard_read_pipeline(drive, 0); 3416 if (idetape_rewind_tape(drive)) 3417 return -EIO; 3418 return 0; 3419 case MTLOAD: 3420 idetape_discard_read_pipeline(drive, 0); 3421 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 3422 return (idetape_queue_pc_tail(drive, &pc)); 3423 case MTUNLOAD: 3424 case MTOFFL: 3425 /* 3426 * If door is locked, attempt to unlock before 3427 * attempting to eject. 3428 */ 3429 if (tape->door_locked) { 3430 if (idetape_create_prevent_cmd(drive, &pc, 0)) 3431 if (!idetape_queue_pc_tail(drive, &pc)) 3432 tape->door_locked = DOOR_UNLOCKED; 3433 } 3434 idetape_discard_read_pipeline(drive, 0); 3435 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); 3436 retval = idetape_queue_pc_tail(drive, &pc); 3437 if (!retval) 3438 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 3439 return retval; 3440 case MTNOP: 3441 idetape_discard_read_pipeline(drive, 0); 3442 return (idetape_flush_tape_buffers(drive)); 3443 case MTRETEN: 3444 idetape_discard_read_pipeline(drive, 0); 3445 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 3446 return (idetape_queue_pc_tail(drive, &pc)); 3447 case MTEOM: 3448 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 3449 return (idetape_queue_pc_tail(drive, &pc)); 3450 case MTERASE: 3451 (void) idetape_rewind_tape(drive); 3452 idetape_create_erase_cmd(&pc); 3453 return (idetape_queue_pc_tail(drive, &pc)); 3454 case MTSETBLK: 3455 if (mt_count) { 3456 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) 3457 return -EIO; 3458 tape->user_bs_factor = mt_count / tape->tape_block_size; 3459 clear_bit(IDETAPE_DETECT_BS, &tape->flags); 3460 } else 3461 set_bit(IDETAPE_DETECT_BS, &tape->flags); 3462 return 0; 3463 case MTSEEK: 3464 idetape_discard_read_pipeline(drive, 0); 3465 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); 3466 case MTSETPART: 3467 idetape_discard_read_pipeline(drive, 0); 3468 return (idetape_position_tape(drive, 0, mt_count, 0)); 3469 case MTFSR: 3470 case MTBSR: 3471 case MTLOCK: 3472 if (!idetape_create_prevent_cmd(drive, &pc, 1)) 3473 return 0; 3474 retval = idetape_queue_pc_tail(drive, &pc); 3475 if (retval) return retval; 3476 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 3477 return 0; 3478 case MTUNLOCK: 3479 if (!idetape_create_prevent_cmd(drive, &pc, 0)) 3480 return 0; 3481 retval = idetape_queue_pc_tail(drive, &pc); 3482 if (retval) return retval; 3483 tape->door_locked = DOOR_UNLOCKED; 3484 return 0; 3485 default: 3486 printk(KERN_ERR "ide-tape: MTIO operation %d not " 3487 "supported\n", mt_op); 3488 return (-EIO); 3489 } 3490} 3491 3492/* 3493 * Our character device ioctls. 3494 * 3495 * General mtio.h magnetic io commands are supported here, and not in 3496 * the corresponding block interface. 3497 * 3498 * The following ioctls are supported: 3499 * 3500 * MTIOCTOP - Refer to idetape_mtioctop for detailed description. 3501 * 3502 * MTIOCGET - The mt_dsreg field in the returned mtget structure 3503 * will be set to (user block size in bytes << 3504 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. 3505 * 3506 * The mt_blkno is set to the current user block number. 3507 * The other mtget fields are not supported. 3508 * 3509 * MTIOCPOS - The current tape "block position" is returned. We 3510 * assume that each block contains user_block_size 3511 * bytes. 3512 * 3513 * Our own ide-tape ioctls are supported on both interfaces. 3514 */ 3515static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 3516{ 3517 struct ide_tape_obj *tape = ide_tape_f(file); 3518 ide_drive_t *drive = tape->drive; 3519 struct mtop mtop; 3520 struct mtget mtget; 3521 struct mtpos mtpos; 3522 int block_offset = 0, position = tape->first_frame_position; 3523 void __user *argp = (void __user *)arg; 3524 3525#if IDETAPE_DEBUG_LOG 3526 if (tape->debug_level >= 3) 3527 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " 3528 "cmd=%u\n", cmd); 3529#endif /* IDETAPE_DEBUG_LOG */ 3530 3531 tape->restart_speed_control_req = 1; 3532 if (tape->chrdev_direction == idetape_direction_write) { 3533 idetape_empty_write_pipeline(drive); 3534 idetape_flush_tape_buffers(drive); 3535 } 3536 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 3537 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); 3538 if ((position = idetape_read_position(drive)) < 0) 3539 return -EIO; 3540 } 3541 switch (cmd) { 3542 case MTIOCTOP: 3543 if (copy_from_user(&mtop, argp, sizeof (struct mtop))) 3544 return -EFAULT; 3545 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); 3546 case MTIOCGET: 3547 memset(&mtget, 0, sizeof (struct mtget)); 3548 mtget.mt_type = MT_ISSCSI2; 3549 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 3550 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 3551 if (tape->drv_write_prot) { 3552 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 3553 } 3554 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 3555 return -EFAULT; 3556 return 0; 3557 case MTIOCPOS: 3558 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 3559 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 3560 return -EFAULT; 3561 return 0; 3562 default: 3563 if (tape->chrdev_direction == idetape_direction_read) 3564 idetape_discard_read_pipeline(drive, 1); 3565 return idetape_blkdev_ioctl(drive, cmd, arg); 3566 } 3567} 3568 3569static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); 3570 3571/* 3572 * Our character device open function. 3573 */ 3574static int idetape_chrdev_open (struct inode *inode, struct file *filp) 3575{ 3576 unsigned int minor = iminor(inode), i = minor & ~0xc0; 3577 ide_drive_t *drive; 3578 idetape_tape_t *tape; 3579 idetape_pc_t pc; 3580 int retval; 3581 3582 /* 3583 * We really want to do nonseekable_open(inode, filp); here, but some 3584 * versions of tar incorrectly call lseek on tapes and bail out if that 3585 * fails. So we disallow pread() and pwrite(), but permit lseeks. 3586 */ 3587 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 3588 3589#if IDETAPE_DEBUG_LOG 3590 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); 3591#endif /* IDETAPE_DEBUG_LOG */ 3592 3593 if (i >= MAX_HWIFS * MAX_DRIVES) 3594 return -ENXIO; 3595 3596 if (!(tape = ide_tape_chrdev_get(i))) 3597 return -ENXIO; 3598 3599 drive = tape->drive; 3600 3601 filp->private_data = tape; 3602 3603 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { 3604 retval = -EBUSY; 3605 goto out_put_tape; 3606 } 3607 3608 retval = idetape_wait_ready(drive, 60 * HZ); 3609 if (retval) { 3610 clear_bit(IDETAPE_BUSY, &tape->flags); 3611 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 3612 goto out_put_tape; 3613 } 3614 3615 idetape_read_position(drive); 3616 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) 3617 (void)idetape_rewind_tape(drive); 3618 3619 if (tape->chrdev_direction != idetape_direction_read) 3620 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 3621 3622 /* Read block size and write protect status from drive. */ 3623 idetape_get_blocksize_from_block_descriptor(drive); 3624 3625 /* Set write protect flag if device is opened as read-only. */ 3626 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 3627 tape->write_prot = 1; 3628 else 3629 tape->write_prot = tape->drv_write_prot; 3630 3631 /* Make sure drive isn't write protected if user wants to write. */ 3632 if (tape->write_prot) { 3633 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 3634 (filp->f_flags & O_ACCMODE) == O_RDWR) { 3635 clear_bit(IDETAPE_BUSY, &tape->flags); 3636 retval = -EROFS; 3637 goto out_put_tape; 3638 } 3639 } 3640 3641 /* 3642 * Lock the tape drive door so user can't eject. 3643 */ 3644 if (tape->chrdev_direction == idetape_direction_none) { 3645 if (idetape_create_prevent_cmd(drive, &pc, 1)) { 3646 if (!idetape_queue_pc_tail(drive, &pc)) { 3647 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 3648 tape->door_locked = DOOR_LOCKED; 3649 } 3650 } 3651 } 3652 idetape_restart_speed_control(drive); 3653 tape->restart_speed_control_req = 0; 3654 return 0; 3655 3656out_put_tape: 3657 ide_tape_put(tape); 3658 return retval; 3659} 3660 3661static void idetape_write_release (ide_drive_t *drive, unsigned int minor) 3662{ 3663 idetape_tape_t *tape = drive->driver_data; 3664 3665 idetape_empty_write_pipeline(drive); 3666 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); 3667 if (tape->merge_stage != NULL) { 3668 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); 3669 __idetape_kfree_stage(tape->merge_stage); 3670 tape->merge_stage = NULL; 3671 } 3672 idetape_write_filemark(drive); 3673 idetape_flush_tape_buffers(drive); 3674 idetape_flush_tape_buffers(drive); 3675} 3676 3677/* 3678 * Our character device release function. 3679 */ 3680static int idetape_chrdev_release (struct inode *inode, struct file *filp) 3681{ 3682 struct ide_tape_obj *tape = ide_tape_f(filp); 3683 ide_drive_t *drive = tape->drive; 3684 idetape_pc_t pc; 3685 unsigned int minor = iminor(inode); 3686 3687 lock_kernel(); 3688 tape = drive->driver_data; 3689#if IDETAPE_DEBUG_LOG 3690 if (tape->debug_level >= 3) 3691 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); 3692#endif /* IDETAPE_DEBUG_LOG */ 3693 3694 if (tape->chrdev_direction == idetape_direction_write) 3695 idetape_write_release(drive, minor); 3696 if (tape->chrdev_direction == idetape_direction_read) { 3697 if (minor < 128) 3698 idetape_discard_read_pipeline(drive, 1); 3699 else 3700 idetape_wait_for_pipeline(drive); 3701 } 3702 if (tape->cache_stage != NULL) { 3703 __idetape_kfree_stage(tape->cache_stage); 3704 tape->cache_stage = NULL; 3705 } 3706 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) 3707 (void) idetape_rewind_tape(drive); 3708 if (tape->chrdev_direction == idetape_direction_none) { 3709 if (tape->door_locked == DOOR_LOCKED) { 3710 if (idetape_create_prevent_cmd(drive, &pc, 0)) { 3711 if (!idetape_queue_pc_tail(drive, &pc)) 3712 tape->door_locked = DOOR_UNLOCKED; 3713 } 3714 } 3715 } 3716 clear_bit(IDETAPE_BUSY, &tape->flags); 3717 ide_tape_put(tape); 3718 unlock_kernel(); 3719 return 0; 3720} 3721 3722/* 3723 * idetape_identify_device is called to check the contents of the 3724 * ATAPI IDENTIFY command results. We return: 3725 * 3726 * 1 If the tape can be supported by us, based on the information 3727 * we have so far. 3728 * 3729 * 0 If this tape driver is not currently supported by us. 3730 */ 3731static int idetape_identify_device (ide_drive_t *drive) 3732{ 3733 struct idetape_id_gcw gcw; 3734 struct hd_driveid *id = drive->id; 3735 3736 if (drive->id_read == 0) 3737 return 1; 3738 3739 *((unsigned short *) &gcw) = id->config; 3740 3741 /* Check that we can support this device */ 3742 3743 if (gcw.protocol != 2) 3744 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", 3745 gcw.protocol); 3746 else if (gcw.device_type != 1) 3747 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " 3748 "to tape\n", gcw.device_type); 3749 else if (!gcw.removable) 3750 printk(KERN_ERR "ide-tape: The removable flag is not set\n"); 3751 else if (gcw.packet_size != 0) { 3752 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 " 3753 "bytes long\n", gcw.packet_size); 3754 } else 3755 return 1; 3756 return 0; 3757} 3758 3759/* 3760 * Use INQUIRY to get the firmware revision 3761 */ 3762static void idetape_get_inquiry_results (ide_drive_t *drive) 3763{ 3764 char *r; 3765 idetape_tape_t *tape = drive->driver_data; 3766 idetape_pc_t pc; 3767 idetape_inquiry_result_t *inquiry; 3768 3769 idetape_create_inquiry_cmd(&pc); 3770 if (idetape_queue_pc_tail(drive, &pc)) { 3771 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); 3772 return; 3773 } 3774 inquiry = (idetape_inquiry_result_t *) pc.buffer; 3775 memcpy(tape->vendor_id, inquiry->vendor_id, 8); 3776 memcpy(tape->product_id, inquiry->product_id, 16); 3777 memcpy(tape->firmware_revision, inquiry->revision_level, 4); 3778 ide_fixstring(tape->vendor_id, 10, 0); 3779 ide_fixstring(tape->product_id, 18, 0); 3780 ide_fixstring(tape->firmware_revision, 6, 0); 3781 r = tape->firmware_revision; 3782 if (*(r + 1) == '.') 3783 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; 3784 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); 3785} 3786 3787/* 3788 * Ask the tape about its various parameters. In particular, we will adjust our 3789 * data transfer buffer size to the recommended value as returned by the tape. 3790 */ 3791static void idetape_get_mode_sense_results (ide_drive_t *drive) 3792{ 3793 idetape_tape_t *tape = drive->driver_data; 3794 idetape_pc_t pc; 3795 u8 *caps; 3796 u8 speed, max_speed; 3797 3798 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 3799 if (idetape_queue_pc_tail(drive, &pc)) { 3800 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 3801 " some default values\n"); 3802 tape->tape_block_size = 512; 3803 put_unaligned(52, (u16 *)&tape->caps[12]); 3804 put_unaligned(540, (u16 *)&tape->caps[14]); 3805 put_unaligned(6*52, (u16 *)&tape->caps[16]); 3806 return; 3807 } 3808 caps = pc.buffer + 4 + pc.buffer[3]; 3809 3810 /* convert to host order and save for later use */ 3811 speed = be16_to_cpu(*(u16 *)&caps[14]); 3812 max_speed = be16_to_cpu(*(u16 *)&caps[8]); 3813 3814 put_unaligned(max_speed, (u16 *)&caps[8]); 3815 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); 3816 put_unaligned(speed, (u16 *)&caps[14]); 3817 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); 3818 3819 if (!speed) { 3820 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 3821 "(assuming 650KB/sec)\n", drive->name); 3822 put_unaligned(650, (u16 *)&caps[14]); 3823 } 3824 if (!max_speed) { 3825 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 3826 "(assuming 650KB/sec)\n", drive->name); 3827 put_unaligned(650, (u16 *)&caps[8]); 3828 } 3829 3830 memcpy(&tape->caps, caps, 20); 3831 if (caps[7] & 0x02) 3832 tape->tape_block_size = 512; 3833 else if (caps[7] & 0x04) 3834 tape->tape_block_size = 1024; 3835} 3836 3837/* 3838 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor 3839 * and if it succeeds sets the tape block size with the reported value 3840 */ 3841static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) 3842{ 3843 3844 idetape_tape_t *tape = drive->driver_data; 3845 idetape_pc_t pc; 3846 idetape_parameter_block_descriptor_t *block_descrp; 3847 3848 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 3849 if (idetape_queue_pc_tail(drive, &pc)) { 3850 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 3851 if (tape->tape_block_size == 0) { 3852 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); 3853 tape->tape_block_size = 32768; 3854 } 3855 return; 3856 } 3857 block_descrp = (idetape_parameter_block_descriptor_t *)(pc.buffer + 4); 3858 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; 3859 tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7; 3860} 3861 3862#ifdef CONFIG_IDE_PROC_FS 3863static void idetape_add_settings (ide_drive_t *drive) 3864{ 3865 idetape_tape_t *tape = drive->driver_data; 3866 3867/* 3868 * drive setting name read/write data type min max mul_factor div_factor data pointer set function 3869 */ 3870 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 3871 1, 2, (u16 *)&tape->caps[16], NULL); 3872 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); 3873 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); 3874 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); 3875 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); 3876 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); 3877 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 3878 1, 1, (u16 *)&tape->caps[14], NULL); 3879 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); 3880 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); 3881 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); 3882 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); 3883 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL); 3884 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); 3885 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); 3886} 3887#else 3888static inline void idetape_add_settings(ide_drive_t *drive) { ; } 3889#endif 3890 3891/* 3892 * ide_setup is called to: 3893 * 3894 * 1. Initialize our various state variables. 3895 * 2. Ask the tape for its capabilities. 3896 * 3. Allocate a buffer which will be used for data 3897 * transfer. The buffer size is chosen based on 3898 * the recommendation which we received in step (2). 3899 * 3900 * Note that at this point ide.c already assigned us an irq, so that 3901 * we can queue requests here and wait for their completion. 3902 */ 3903static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) 3904{ 3905 unsigned long t1, tmid, tn, t; 3906 int speed; 3907 struct idetape_id_gcw gcw; 3908 int stage_size; 3909 struct sysinfo si; 3910 u16 *ctl = (u16 *)&tape->caps[12]; 3911 3912 spin_lock_init(&tape->spinlock); 3913 drive->dsc_overlap = 1; 3914 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 3915 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 3916 tape->name); 3917 drive->dsc_overlap = 0; 3918 } 3919 /* Seagate Travan drives do not support DSC overlap. */ 3920 if (strstr(drive->id->model, "Seagate STT3401")) 3921 drive->dsc_overlap = 0; 3922 tape->minor = minor; 3923 tape->name[0] = 'h'; 3924 tape->name[1] = 't'; 3925 tape->name[2] = '0' + minor; 3926 tape->chrdev_direction = idetape_direction_none; 3927 tape->pc = tape->pc_stack; 3928 tape->max_insert_speed = 10000; 3929 tape->speed_control = 1; 3930 *((unsigned short *) &gcw) = drive->id->config; 3931 if (gcw.drq_type == 1) 3932 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); 3933 3934 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; 3935 3936 idetape_get_inquiry_results(drive); 3937 idetape_get_mode_sense_results(drive); 3938 idetape_get_blocksize_from_block_descriptor(drive); 3939 tape->user_bs_factor = 1; 3940 tape->stage_size = *ctl * tape->tape_block_size; 3941 while (tape->stage_size > 0xffff) { 3942 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 3943 *ctl /= 2; 3944 tape->stage_size = *ctl * tape->tape_block_size; 3945 } 3946 stage_size = tape->stage_size; 3947 tape->pages_per_stage = stage_size / PAGE_SIZE; 3948 if (stage_size % PAGE_SIZE) { 3949 tape->pages_per_stage++; 3950 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; 3951 } 3952 3953 /* Select the "best" DSC read/write polling freq and pipeline size. */ 3954 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 3955 3956 tape->max_stages = speed * 1000 * 10 / tape->stage_size; 3957 3958 /* 3959 * Limit memory use for pipeline to 10% of physical memory 3960 */ 3961 si_meminfo(&si); 3962 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) 3963 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); 3964 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); 3965 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); 3966 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); 3967 if (tape->max_stages == 0) 3968 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; 3969 3970 t1 = (tape->stage_size * HZ) / (speed * 1000); 3971 tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125); 3972 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); 3973 3974 if (tape->max_stages) 3975 t = tn; 3976 else 3977 t = t1; 3978 3979 /* 3980 * Ensure that the number we got makes sense; limit 3981 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 3982 */ 3983 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); 3984 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 3985 "%dkB pipeline, %lums tDSC%s\n", 3986 drive->name, tape->name, *(u16 *)&tape->caps[14], 3987 (*(u16 *)&tape->caps[16] * 512) / tape->stage_size, 3988 tape->stage_size / 1024, 3989 tape->max_stages * tape->stage_size / 1024, 3990 tape->best_dsc_rw_frequency * 1000 / HZ, 3991 drive->using_dma ? ", DMA":""); 3992 3993 idetape_add_settings(drive); 3994} 3995 3996static void ide_tape_remove(ide_drive_t *drive) 3997{ 3998 idetape_tape_t *tape = drive->driver_data; 3999 4000 ide_proc_unregister_driver(drive, tape->driver); 4001 4002 ide_unregister_region(tape->disk); 4003 4004 ide_tape_put(tape); 4005} 4006 4007static void ide_tape_release(struct kref *kref) 4008{ 4009 struct ide_tape_obj *tape = to_ide_tape(kref); 4010 ide_drive_t *drive = tape->drive; 4011 struct gendisk *g = tape->disk; 4012 4013 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); 4014 4015 drive->dsc_overlap = 0; 4016 drive->driver_data = NULL; 4017 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 4018 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 4019 idetape_devs[tape->minor] = NULL; 4020 g->private_data = NULL; 4021 put_disk(g); 4022 kfree(tape); 4023} 4024 4025#ifdef CONFIG_IDE_PROC_FS 4026static int proc_idetape_read_name 4027 (char *page, char **start, off_t off, int count, int *eof, void *data) 4028{ 4029 ide_drive_t *drive = (ide_drive_t *) data; 4030 idetape_tape_t *tape = drive->driver_data; 4031 char *out = page; 4032 int len; 4033 4034 len = sprintf(out, "%s\n", tape->name); 4035 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 4036} 4037 4038static ide_proc_entry_t idetape_proc[] = { 4039 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 4040 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 4041 { NULL, 0, NULL, NULL } 4042}; 4043#endif 4044 4045static int ide_tape_probe(ide_drive_t *); 4046 4047static ide_driver_t idetape_driver = { 4048 .gen_driver = { 4049 .owner = THIS_MODULE, 4050 .name = "ide-tape", 4051 .bus = &ide_bus_type, 4052 }, 4053 .probe = ide_tape_probe, 4054 .remove = ide_tape_remove, 4055 .version = IDETAPE_VERSION, 4056 .media = ide_tape, 4057 .supports_dsc_overlap = 1, 4058 .do_request = idetape_do_request, 4059 .end_request = idetape_end_request, 4060 .error = __ide_error, 4061 .abort = __ide_abort, 4062#ifdef CONFIG_IDE_PROC_FS 4063 .proc = idetape_proc, 4064#endif 4065}; 4066 4067/* 4068 * Our character device supporting functions, passed to register_chrdev. 4069 */ 4070static const struct file_operations idetape_fops = { 4071 .owner = THIS_MODULE, 4072 .read = idetape_chrdev_read, 4073 .write = idetape_chrdev_write, 4074 .ioctl = idetape_chrdev_ioctl, 4075 .open = idetape_chrdev_open, 4076 .release = idetape_chrdev_release, 4077}; 4078 4079static int idetape_open(struct inode *inode, struct file *filp) 4080{ 4081 struct gendisk *disk = inode->i_bdev->bd_disk; 4082 struct ide_tape_obj *tape; 4083 4084 if (!(tape = ide_tape_get(disk))) 4085 return -ENXIO; 4086 4087 return 0; 4088} 4089 4090static int idetape_release(struct inode *inode, struct file *filp) 4091{ 4092 struct gendisk *disk = inode->i_bdev->bd_disk; 4093 struct ide_tape_obj *tape = ide_tape_g(disk); 4094 4095 ide_tape_put(tape); 4096 4097 return 0; 4098} 4099 4100static int idetape_ioctl(struct inode *inode, struct file *file, 4101 unsigned int cmd, unsigned long arg) 4102{ 4103 struct block_device *bdev = inode->i_bdev; 4104 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); 4105 ide_drive_t *drive = tape->drive; 4106 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 4107 if (err == -EINVAL) 4108 err = idetape_blkdev_ioctl(drive, cmd, arg); 4109 return err; 4110} 4111 4112static struct block_device_operations idetape_block_ops = { 4113 .owner = THIS_MODULE, 4114 .open = idetape_open, 4115 .release = idetape_release, 4116 .ioctl = idetape_ioctl, 4117}; 4118 4119static int ide_tape_probe(ide_drive_t *drive) 4120{ 4121 idetape_tape_t *tape; 4122 struct gendisk *g; 4123 int minor; 4124 4125 if (!strstr("ide-tape", drive->driver_req)) 4126 goto failed; 4127 if (!drive->present) 4128 goto failed; 4129 if (drive->media != ide_tape) 4130 goto failed; 4131 if (!idetape_identify_device (drive)) { 4132 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); 4133 goto failed; 4134 } 4135 if (drive->scsi) { 4136 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); 4137 goto failed; 4138 } 4139 if (strstr(drive->id->model, "OnStream DI-")) { 4140 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); 4141 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); 4142 } 4143 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL); 4144 if (tape == NULL) { 4145 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); 4146 goto failed; 4147 } 4148 4149 g = alloc_disk(1 << PARTN_BITS); 4150 if (!g) 4151 goto out_free_tape; 4152 4153 ide_init_disk(g, drive); 4154 4155 ide_proc_register_driver(drive, &idetape_driver); 4156 4157 kref_init(&tape->kref); 4158 4159 tape->drive = drive; 4160 tape->driver = &idetape_driver; 4161 tape->disk = g; 4162 4163 g->private_data = &tape->driver; 4164 4165 drive->driver_data = tape; 4166 4167 mutex_lock(&idetape_ref_mutex); 4168 for (minor = 0; idetape_devs[minor]; minor++) 4169 ; 4170 idetape_devs[minor] = tape; 4171 mutex_unlock(&idetape_ref_mutex); 4172 4173 idetape_setup(drive, tape, minor); 4174 4175 device_create(idetape_sysfs_class, &drive->gendev, 4176 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); 4177 device_create(idetape_sysfs_class, &drive->gendev, 4178 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); 4179 4180 g->fops = &idetape_block_ops; 4181 ide_register_region(g); 4182 4183 return 0; 4184 4185out_free_tape: 4186 kfree(tape); 4187failed: 4188 return -ENODEV; 4189} 4190 4191MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 4192MODULE_LICENSE("GPL"); 4193 4194static void __exit idetape_exit (void) 4195{ 4196 driver_unregister(&idetape_driver.gen_driver); 4197 class_destroy(idetape_sysfs_class); 4198 unregister_chrdev(IDETAPE_MAJOR, "ht"); 4199} 4200 4201static int __init idetape_init(void) 4202{ 4203 int error = 1; 4204 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 4205 if (IS_ERR(idetape_sysfs_class)) { 4206 idetape_sysfs_class = NULL; 4207 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 4208 error = -EBUSY; 4209 goto out; 4210 } 4211 4212 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 4213 printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); 4214 error = -EBUSY; 4215 goto out_free_class; 4216 } 4217 4218 error = driver_register(&idetape_driver.gen_driver); 4219 if (error) 4220 goto out_free_driver; 4221 4222 return 0; 4223 4224out_free_driver: 4225 driver_unregister(&idetape_driver.gen_driver); 4226out_free_class: 4227 class_destroy(idetape_sysfs_class); 4228out: 4229 return error; 4230} 4231 4232MODULE_ALIAS("ide:*m-tape*"); 4233module_init(idetape_init); 4234module_exit(idetape_exit); 4235MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 4236