ide-tape.c revision 963da55c4b9eeeb2085ca74ba927cf77bce966d4
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 DRV_NAME "ide-tape" 19 20#define IDETAPE_VERSION "1.20" 21 22#include <linux/module.h> 23#include <linux/types.h> 24#include <linux/string.h> 25#include <linux/kernel.h> 26#include <linux/delay.h> 27#include <linux/timer.h> 28#include <linux/mm.h> 29#include <linux/interrupt.h> 30#include <linux/jiffies.h> 31#include <linux/major.h> 32#include <linux/errno.h> 33#include <linux/genhd.h> 34#include <linux/slab.h> 35#include <linux/pci.h> 36#include <linux/ide.h> 37#include <linux/smp_lock.h> 38#include <linux/completion.h> 39#include <linux/bitops.h> 40#include <linux/mutex.h> 41#include <scsi/scsi.h> 42 43#include <asm/byteorder.h> 44#include <linux/irq.h> 45#include <linux/uaccess.h> 46#include <linux/io.h> 47#include <asm/unaligned.h> 48#include <linux/mtio.h> 49 50enum { 51 /* output errors only */ 52 DBG_ERR = (1 << 0), 53 /* output all sense key/asc */ 54 DBG_SENSE = (1 << 1), 55 /* info regarding all chrdev-related procedures */ 56 DBG_CHRDEV = (1 << 2), 57 /* all remaining procedures */ 58 DBG_PROCS = (1 << 3), 59}; 60 61/* define to see debug info */ 62#define IDETAPE_DEBUG_LOG 0 63 64#if IDETAPE_DEBUG_LOG 65#define debug_log(lvl, fmt, args...) \ 66{ \ 67 if (tape->debug_mask & lvl) \ 68 printk(KERN_INFO "ide-tape: " fmt, ## args); \ 69} 70#else 71#define debug_log(lvl, fmt, args...) do {} while (0) 72#endif 73 74/**************************** Tunable parameters *****************************/ 75/* 76 * After each failed packet command we issue a request sense command and retry 77 * the packet command IDETAPE_MAX_PC_RETRIES times. 78 * 79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 80 */ 81#define IDETAPE_MAX_PC_RETRIES 3 82 83/* 84 * The following parameter is used to select the point in the internal tape fifo 85 * in which we will start to refill the buffer. Decreasing the following 86 * parameter will improve the system's latency and interactive response, while 87 * using a high value might improve system throughput. 88 */ 89#define IDETAPE_FIFO_THRESHOLD 2 90 91/* 92 * DSC polling parameters. 93 * 94 * Polling for DSC (a single bit in the status register) is a very important 95 * function in ide-tape. There are two cases in which we poll for DSC: 96 * 97 * 1. Before a read/write packet command, to ensure that we can transfer data 98 * from/to the tape's data buffers, without causing an actual media access. 99 * In case the tape is not ready yet, we take out our request from the device 100 * request queue, so that ide.c could service requests from the other device 101 * on the same interface in the meantime. 102 * 103 * 2. After the successful initialization of a "media access packet command", 104 * which is a command that can take a long time to complete (the interval can 105 * range from several seconds to even an hour). Again, we postpone our request 106 * in the middle to free the bus for the other device. The polling frequency 107 * here should be lower than the read/write frequency since those media access 108 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 109 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 110 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 111 * 112 * We also set a timeout for the timer, in case something goes wrong. The 113 * timeout should be longer then the maximum execution time of a tape operation. 114 */ 115 116/* DSC timings. */ 117#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 118#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 119#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 120#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 121#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 122#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 123#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 124 125/*************************** End of tunable parameters ***********************/ 126 127/* tape directions */ 128enum { 129 IDETAPE_DIR_NONE = (1 << 0), 130 IDETAPE_DIR_READ = (1 << 1), 131 IDETAPE_DIR_WRITE = (1 << 2), 132}; 133 134/* Tape door status */ 135#define DOOR_UNLOCKED 0 136#define DOOR_LOCKED 1 137#define DOOR_EXPLICITLY_LOCKED 2 138 139/* Some defines for the SPACE command */ 140#define IDETAPE_SPACE_OVER_FILEMARK 1 141#define IDETAPE_SPACE_TO_EOD 3 142 143/* Some defines for the LOAD UNLOAD command */ 144#define IDETAPE_LU_LOAD_MASK 1 145#define IDETAPE_LU_RETENSION_MASK 2 146#define IDETAPE_LU_EOT_MASK 4 147 148/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 149#define IDETAPE_BLOCK_DESCRIPTOR 0 150#define IDETAPE_CAPABILITIES_PAGE 0x2a 151 152/* 153 * Most of our global data which we need to save even as we leave the driver due 154 * to an interrupt or a timer event is stored in the struct defined below. 155 */ 156typedef struct ide_tape_obj { 157 ide_drive_t *drive; 158 struct ide_driver *driver; 159 struct gendisk *disk; 160 struct device dev; 161 162 /* used by REQ_IDETAPE_{READ,WRITE} requests */ 163 struct ide_atapi_pc queued_pc; 164 165 /* 166 * DSC polling variables. 167 * 168 * While polling for DSC we use postponed_rq to postpone the current 169 * request so that ide.c will be able to service pending requests on the 170 * other device. Note that at most we will have only one DSC (usually 171 * data transfer) request in the device request queue. 172 */ 173 struct request *postponed_rq; 174 /* The time in which we started polling for DSC */ 175 unsigned long dsc_polling_start; 176 /* Timer used to poll for dsc */ 177 struct timer_list dsc_timer; 178 /* Read/Write dsc polling frequency */ 179 unsigned long best_dsc_rw_freq; 180 unsigned long dsc_poll_freq; 181 unsigned long dsc_timeout; 182 183 /* Read position information */ 184 u8 partition; 185 /* Current block */ 186 unsigned int first_frame; 187 188 /* Last error information */ 189 u8 sense_key, asc, ascq; 190 191 /* Character device operation */ 192 unsigned int minor; 193 /* device name */ 194 char name[4]; 195 /* Current character device data transfer direction */ 196 u8 chrdev_dir; 197 198 /* tape block size, usually 512 or 1024 bytes */ 199 unsigned short blk_size; 200 int user_bs_factor; 201 202 /* Copy of the tape's Capabilities and Mechanical Page */ 203 u8 caps[20]; 204 205 /* 206 * Active data transfer request parameters. 207 * 208 * At most, there is only one ide-tape originated data transfer request 209 * in the device request queue. This allows ide.c to easily service 210 * requests from the other device when we postpone our active request. 211 */ 212 213 /* Data buffer size chosen based on the tape's recommendation */ 214 int buffer_size; 215 /* Staging buffer of buffer_size bytes */ 216 void *buf; 217 /* The read/write cursor */ 218 void *cur; 219 /* The number of valid bytes in buf */ 220 size_t valid; 221 222 /* Measures average tape speed */ 223 unsigned long avg_time; 224 int avg_size; 225 int avg_speed; 226 227 /* the door is currently locked */ 228 int door_locked; 229 /* the tape hardware is write protected */ 230 char drv_write_prot; 231 /* the tape is write protected (hardware or opened as read-only) */ 232 char write_prot; 233 234 u32 debug_mask; 235} idetape_tape_t; 236 237static DEFINE_MUTEX(idetape_ref_mutex); 238 239static struct class *idetape_sysfs_class; 240 241static void ide_tape_release(struct device *); 242 243static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 244{ 245 struct ide_tape_obj *tape = NULL; 246 247 mutex_lock(&idetape_ref_mutex); 248 tape = ide_drv_g(disk, ide_tape_obj); 249 if (tape) { 250 if (ide_device_get(tape->drive)) 251 tape = NULL; 252 else 253 get_device(&tape->dev); 254 } 255 mutex_unlock(&idetape_ref_mutex); 256 return tape; 257} 258 259static void ide_tape_put(struct ide_tape_obj *tape) 260{ 261 ide_drive_t *drive = tape->drive; 262 263 mutex_lock(&idetape_ref_mutex); 264 put_device(&tape->dev); 265 ide_device_put(drive); 266 mutex_unlock(&idetape_ref_mutex); 267} 268 269/* 270 * The variables below are used for the character device interface. Additional 271 * state variables are defined in our ide_drive_t structure. 272 */ 273static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 274 275static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 276{ 277 struct ide_tape_obj *tape = NULL; 278 279 mutex_lock(&idetape_ref_mutex); 280 tape = idetape_devs[i]; 281 if (tape) 282 get_device(&tape->dev); 283 mutex_unlock(&idetape_ref_mutex); 284 return tape; 285} 286 287/* 288 * called on each failed packet command retry to analyze the request sense. We 289 * currently do not utilize this information. 290 */ 291static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) 292{ 293 idetape_tape_t *tape = drive->driver_data; 294 struct ide_atapi_pc *pc = drive->failed_pc; 295 296 tape->sense_key = sense[2] & 0xF; 297 tape->asc = sense[12]; 298 tape->ascq = sense[13]; 299 300 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", 301 pc->c[0], tape->sense_key, tape->asc, tape->ascq); 302 303 /* Correct pc->xferred by asking the tape. */ 304 if (pc->flags & PC_FLAG_DMA_ERROR) 305 pc->xferred = pc->req_xfer - 306 tape->blk_size * 307 get_unaligned_be32(&sense[3]); 308 309 /* 310 * If error was the result of a zero-length read or write command, 311 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 312 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 313 */ 314 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 315 /* length == 0 */ 316 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 317 if (tape->sense_key == 5) { 318 /* don't report an error, everything's ok */ 319 pc->error = 0; 320 /* don't retry read/write */ 321 pc->flags |= PC_FLAG_ABORT; 322 } 323 } 324 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 325 pc->error = IDE_DRV_ERROR_FILEMARK; 326 pc->flags |= PC_FLAG_ABORT; 327 } 328 if (pc->c[0] == WRITE_6) { 329 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 330 && tape->asc == 0x0 && tape->ascq == 0x2)) { 331 pc->error = IDE_DRV_ERROR_EOD; 332 pc->flags |= PC_FLAG_ABORT; 333 } 334 } 335 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 336 if (tape->sense_key == 8) { 337 pc->error = IDE_DRV_ERROR_EOD; 338 pc->flags |= PC_FLAG_ABORT; 339 } 340 if (!(pc->flags & PC_FLAG_ABORT) && 341 pc->xferred) 342 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 343 } 344} 345 346static void ide_tape_handle_dsc(ide_drive_t *); 347 348static int ide_tape_callback(ide_drive_t *drive, int dsc) 349{ 350 idetape_tape_t *tape = drive->driver_data; 351 struct ide_atapi_pc *pc = drive->pc; 352 struct request *rq = drive->hwif->rq; 353 int uptodate = pc->error ? 0 : 1; 354 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; 355 356 debug_log(DBG_PROCS, "Enter %s\n", __func__); 357 358 if (dsc) 359 ide_tape_handle_dsc(drive); 360 361 if (drive->failed_pc == pc) 362 drive->failed_pc = NULL; 363 364 if (pc->c[0] == REQUEST_SENSE) { 365 if (uptodate) 366 idetape_analyze_error(drive, pc->buf); 367 else 368 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 369 "itself - Aborting request!\n"); 370 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 371 int blocks = pc->xferred / tape->blk_size; 372 373 tape->avg_size += blocks * tape->blk_size; 374 375 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 376 tape->avg_speed = tape->avg_size * HZ / 377 (jiffies - tape->avg_time) / 1024; 378 tape->avg_size = 0; 379 tape->avg_time = jiffies; 380 } 381 382 tape->first_frame += blocks; 383 rq->data_len -= blocks * tape->blk_size; 384 385 if (pc->error) { 386 uptodate = 0; 387 err = pc->error; 388 } 389 } else if (pc->c[0] == READ_POSITION && uptodate) { 390 u8 *readpos = pc->buf; 391 392 debug_log(DBG_SENSE, "BOP - %s\n", 393 (readpos[0] & 0x80) ? "Yes" : "No"); 394 debug_log(DBG_SENSE, "EOP - %s\n", 395 (readpos[0] & 0x40) ? "Yes" : "No"); 396 397 if (readpos[0] & 0x4) { 398 printk(KERN_INFO "ide-tape: Block location is unknown" 399 "to the tape\n"); 400 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 401 uptodate = 0; 402 err = IDE_DRV_ERROR_GENERAL; 403 } else { 404 debug_log(DBG_SENSE, "Block Location - %u\n", 405 be32_to_cpup((__be32 *)&readpos[4])); 406 407 tape->partition = readpos[1]; 408 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); 409 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); 410 } 411 } 412 413 rq->errors = err; 414 415 return uptodate; 416} 417 418/* 419 * Postpone the current request so that ide.c will be able to service requests 420 * from another device on the same port while we are polling for DSC. 421 */ 422static void idetape_postpone_request(ide_drive_t *drive) 423{ 424 idetape_tape_t *tape = drive->driver_data; 425 426 debug_log(DBG_PROCS, "Enter %s\n", __func__); 427 428 tape->postponed_rq = drive->hwif->rq; 429 430 ide_stall_queue(drive, tape->dsc_poll_freq); 431} 432 433static void ide_tape_handle_dsc(ide_drive_t *drive) 434{ 435 idetape_tape_t *tape = drive->driver_data; 436 437 /* Media access command */ 438 tape->dsc_polling_start = jiffies; 439 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 440 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 441 /* Allow ide.c to handle other requests */ 442 idetape_postpone_request(drive); 443} 444 445/* 446 * Packet Command Interface 447 * 448 * The current Packet Command is available in drive->pc, and will not change 449 * until we finish handling it. Each packet command is associated with a 450 * callback function that will be called when the command is finished. 451 * 452 * The handling will be done in three stages: 453 * 454 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set 455 * the interrupt handler to ide_pc_intr. 456 * 457 * 2. On each interrupt, ide_pc_intr will be called. This step will be 458 * repeated until the device signals us that no more interrupts will be issued. 459 * 460 * 3. ATAPI Tape media access commands have immediate status with a delayed 461 * process. In case of a successful initiation of a media access packet command, 462 * the DSC bit will be set when the actual execution of the command is finished. 463 * Since the tape drive will not issue an interrupt, we have to poll for this 464 * event. In this case, we define the request as "low priority request" by 465 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 466 * exit the driver. 467 * 468 * ide.c will then give higher priority to requests which originate from the 469 * other device, until will change rq_status to RQ_ACTIVE. 470 * 471 * 4. When the packet command is finished, it will be checked for errors. 472 * 473 * 5. In case an error was found, we queue a request sense packet command in 474 * front of the request queue and retry the operation up to 475 * IDETAPE_MAX_PC_RETRIES times. 476 * 477 * 6. In case no error was found, or we decided to give up and not to retry 478 * again, the callback function will be called and then we will handle the next 479 * request. 480 */ 481 482static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, 483 struct ide_cmd *cmd, 484 struct ide_atapi_pc *pc) 485{ 486 idetape_tape_t *tape = drive->driver_data; 487 488 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 489 drive->failed_pc = pc; 490 491 /* Set the current packet command */ 492 drive->pc = pc; 493 494 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 495 (pc->flags & PC_FLAG_ABORT)) { 496 unsigned int done = blk_rq_bytes(drive->hwif->rq); 497 498 /* 499 * We will "abort" retrying a packet command in case legitimate 500 * error code was received (crossing a filemark, or end of the 501 * media, for example). 502 */ 503 if (!(pc->flags & PC_FLAG_ABORT)) { 504 if (!(pc->c[0] == TEST_UNIT_READY && 505 tape->sense_key == 2 && tape->asc == 4 && 506 (tape->ascq == 1 || tape->ascq == 8))) { 507 printk(KERN_ERR "ide-tape: %s: I/O error, " 508 "pc = %2x, key = %2x, " 509 "asc = %2x, ascq = %2x\n", 510 tape->name, pc->c[0], 511 tape->sense_key, tape->asc, 512 tape->ascq); 513 } 514 /* Giving up */ 515 pc->error = IDE_DRV_ERROR_GENERAL; 516 } 517 518 drive->failed_pc = NULL; 519 drive->pc_callback(drive, 0); 520 ide_complete_rq(drive, -EIO, done); 521 return ide_stopped; 522 } 523 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); 524 525 pc->retries++; 526 527 return ide_issue_pc(drive, cmd); 528} 529 530/* A mode sense command is used to "sense" tape parameters. */ 531static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 532{ 533 ide_init_pc(pc); 534 pc->c[0] = MODE_SENSE; 535 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 536 /* DBD = 1 - Don't return block descriptors */ 537 pc->c[1] = 8; 538 pc->c[2] = page_code; 539 /* 540 * Changed pc->c[3] to 0 (255 will at best return unused info). 541 * 542 * For SCSI this byte is defined as subpage instead of high byte 543 * of length and some IDE drives seem to interpret it this way 544 * and return an error when 255 is used. 545 */ 546 pc->c[3] = 0; 547 /* We will just discard data in that case */ 548 pc->c[4] = 255; 549 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 550 pc->req_xfer = 12; 551 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 552 pc->req_xfer = 24; 553 else 554 pc->req_xfer = 50; 555} 556 557static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 558{ 559 ide_hwif_t *hwif = drive->hwif; 560 idetape_tape_t *tape = drive->driver_data; 561 struct ide_atapi_pc *pc = drive->pc; 562 u8 stat; 563 564 stat = hwif->tp_ops->read_status(hwif); 565 566 if (stat & ATA_DSC) { 567 if (stat & ATA_ERR) { 568 /* Error detected */ 569 if (pc->c[0] != TEST_UNIT_READY) 570 printk(KERN_ERR "ide-tape: %s: I/O error, ", 571 tape->name); 572 /* Retry operation */ 573 ide_retry_pc(drive); 574 return ide_stopped; 575 } 576 pc->error = 0; 577 } else { 578 pc->error = IDE_DRV_ERROR_GENERAL; 579 drive->failed_pc = NULL; 580 } 581 drive->pc_callback(drive, 0); 582 return ide_stopped; 583} 584 585static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 586 struct ide_atapi_pc *pc, struct request *rq, 587 u8 opcode) 588{ 589 unsigned int length = rq->nr_sectors; 590 591 ide_init_pc(pc); 592 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 593 pc->c[1] = 1; 594 pc->bh = NULL; 595 pc->buf = NULL; 596 pc->buf_size = length * tape->blk_size; 597 pc->req_xfer = pc->buf_size; 598 if (pc->req_xfer == tape->buffer_size) 599 pc->flags |= PC_FLAG_DMA_OK; 600 601 if (opcode == READ_6) 602 pc->c[0] = READ_6; 603 else if (opcode == WRITE_6) { 604 pc->c[0] = WRITE_6; 605 pc->flags |= PC_FLAG_WRITING; 606 } 607 608 memcpy(rq->cmd, pc->c, 12); 609} 610 611static ide_startstop_t idetape_do_request(ide_drive_t *drive, 612 struct request *rq, sector_t block) 613{ 614 ide_hwif_t *hwif = drive->hwif; 615 idetape_tape_t *tape = drive->driver_data; 616 struct ide_atapi_pc *pc = NULL; 617 struct request *postponed_rq = tape->postponed_rq; 618 struct ide_cmd cmd; 619 u8 stat; 620 621 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n" 622 (unsigned long long)rq->sector, rq->nr_sectors); 623 624 if (!(blk_special_request(rq) || blk_sense_request(rq))) { 625 /* We do not support buffer cache originated requests. */ 626 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 627 "request queue (%d)\n", drive->name, rq->cmd_type); 628 if (blk_fs_request(rq) == 0 && rq->errors == 0) 629 rq->errors = -EIO; 630 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq)); 631 return ide_stopped; 632 } 633 634 /* Retry a failed packet command */ 635 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 636 pc = drive->failed_pc; 637 goto out; 638 } 639 640 if (postponed_rq != NULL) 641 if (rq != postponed_rq) { 642 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 643 "Two DSC requests were queued\n"); 644 drive->failed_pc = NULL; 645 rq->errors = 0; 646 ide_complete_rq(drive, 0, blk_rq_bytes(rq)); 647 return ide_stopped; 648 } 649 650 tape->postponed_rq = NULL; 651 652 /* 653 * If the tape is still busy, postpone our request and service 654 * the other device meanwhile. 655 */ 656 stat = hwif->tp_ops->read_status(hwif); 657 658 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 659 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 660 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 661 662 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 663 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 664 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 665 } 666 667 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && 668 (stat & ATA_DSC) == 0) { 669 if (postponed_rq == NULL) { 670 tape->dsc_polling_start = jiffies; 671 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 672 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 673 } else if (time_after(jiffies, tape->dsc_timeout)) { 674 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 675 tape->name); 676 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 677 idetape_media_access_finished(drive); 678 return ide_stopped; 679 } else { 680 return ide_do_reset(drive); 681 } 682 } else if (time_after(jiffies, 683 tape->dsc_polling_start + 684 IDETAPE_DSC_MA_THRESHOLD)) 685 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 686 idetape_postpone_request(drive); 687 return ide_stopped; 688 } 689 if (rq->cmd[13] & REQ_IDETAPE_READ) { 690 pc = &tape->queued_pc; 691 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 692 goto out; 693 } 694 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 695 pc = &tape->queued_pc; 696 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 697 goto out; 698 } 699 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 700 pc = (struct ide_atapi_pc *)rq->special; 701 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 702 rq->cmd[13] |= REQ_IDETAPE_PC2; 703 goto out; 704 } 705 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 706 idetape_media_access_finished(drive); 707 return ide_stopped; 708 } 709 BUG(); 710 711out: 712 /* prepare sense request for this command */ 713 ide_prep_sense(drive, rq); 714 715 memset(&cmd, 0, sizeof(cmd)); 716 717 if (rq_data_dir(rq)) 718 cmd.tf_flags |= IDE_TFLAG_WRITE; 719 720 cmd.rq = rq; 721 722 ide_init_sg_cmd(&cmd, pc->req_xfer); 723 ide_map_sg(drive, &cmd); 724 725 return ide_tape_issue_pc(drive, &cmd, pc); 726} 727 728/* 729 * Write a filemark if write_filemark=1. Flush the device buffers without 730 * writing a filemark otherwise. 731 */ 732static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 733 struct ide_atapi_pc *pc, int write_filemark) 734{ 735 ide_init_pc(pc); 736 pc->c[0] = WRITE_FILEMARKS; 737 pc->c[4] = write_filemark; 738 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 739} 740 741static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 742{ 743 idetape_tape_t *tape = drive->driver_data; 744 struct gendisk *disk = tape->disk; 745 int load_attempted = 0; 746 747 /* Wait for the tape to become ready */ 748 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 749 timeout += jiffies; 750 while (time_before(jiffies, timeout)) { 751 if (ide_do_test_unit_ready(drive, disk) == 0) 752 return 0; 753 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 754 || (tape->asc == 0x3A)) { 755 /* no media */ 756 if (load_attempted) 757 return -ENOMEDIUM; 758 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 759 load_attempted = 1; 760 /* not about to be ready */ 761 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 762 (tape->ascq == 1 || tape->ascq == 8))) 763 return -EIO; 764 msleep(100); 765 } 766 return -EIO; 767} 768 769static int idetape_flush_tape_buffers(ide_drive_t *drive) 770{ 771 struct ide_tape_obj *tape = drive->driver_data; 772 struct ide_atapi_pc pc; 773 int rc; 774 775 idetape_create_write_filemark_cmd(drive, &pc, 0); 776 rc = ide_queue_pc_tail(drive, tape->disk, &pc); 777 if (rc) 778 return rc; 779 idetape_wait_ready(drive, 60 * 5 * HZ); 780 return 0; 781} 782 783static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 784{ 785 ide_init_pc(pc); 786 pc->c[0] = READ_POSITION; 787 pc->req_xfer = 20; 788} 789 790static int idetape_read_position(ide_drive_t *drive) 791{ 792 idetape_tape_t *tape = drive->driver_data; 793 struct ide_atapi_pc pc; 794 int position; 795 796 debug_log(DBG_PROCS, "Enter %s\n", __func__); 797 798 idetape_create_read_position_cmd(&pc); 799 if (ide_queue_pc_tail(drive, tape->disk, &pc)) 800 return -1; 801 position = tape->first_frame; 802 return position; 803} 804 805static void idetape_create_locate_cmd(ide_drive_t *drive, 806 struct ide_atapi_pc *pc, 807 unsigned int block, u8 partition, int skip) 808{ 809 ide_init_pc(pc); 810 pc->c[0] = POSITION_TO_ELEMENT; 811 pc->c[1] = 2; 812 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 813 pc->c[8] = partition; 814 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 815} 816 817static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 818{ 819 idetape_tape_t *tape = drive->driver_data; 820 821 if (tape->chrdev_dir != IDETAPE_DIR_READ) 822 return; 823 824 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); 825 tape->valid = 0; 826 if (tape->buf != NULL) { 827 kfree(tape->buf); 828 tape->buf = NULL; 829 } 830 831 tape->chrdev_dir = IDETAPE_DIR_NONE; 832} 833 834/* 835 * Position the tape to the requested block using the LOCATE packet command. 836 * A READ POSITION command is then issued to check where we are positioned. Like 837 * all higher level operations, we queue the commands at the tail of the request 838 * queue and wait for their completion. 839 */ 840static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 841 u8 partition, int skip) 842{ 843 idetape_tape_t *tape = drive->driver_data; 844 struct gendisk *disk = tape->disk; 845 int retval; 846 struct ide_atapi_pc pc; 847 848 if (tape->chrdev_dir == IDETAPE_DIR_READ) 849 __ide_tape_discard_merge_buffer(drive); 850 idetape_wait_ready(drive, 60 * 5 * HZ); 851 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 852 retval = ide_queue_pc_tail(drive, disk, &pc); 853 if (retval) 854 return (retval); 855 856 idetape_create_read_position_cmd(&pc); 857 return ide_queue_pc_tail(drive, disk, &pc); 858} 859 860static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 861 int restore_position) 862{ 863 idetape_tape_t *tape = drive->driver_data; 864 int seek, position; 865 866 __ide_tape_discard_merge_buffer(drive); 867 if (restore_position) { 868 position = idetape_read_position(drive); 869 seek = position > 0 ? position : 0; 870 if (idetape_position_tape(drive, seek, 0, 0)) { 871 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 872 " %s\n", tape->name, __func__); 873 return; 874 } 875 } 876} 877 878/* 879 * Generate a read/write request for the block device interface and wait for it 880 * to be serviced. 881 */ 882static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks) 883{ 884 idetape_tape_t *tape = drive->driver_data; 885 size_t size = blocks * tape->blk_size; 886 struct request *rq; 887 int ret; 888 889 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 890 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 891 892 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 893 rq->cmd_type = REQ_TYPE_SPECIAL; 894 rq->cmd[13] = cmd; 895 rq->rq_disk = tape->disk; 896 rq->sector = tape->first_frame; 897 898 if (size) { 899 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 900 __GFP_WAIT); 901 if (ret) 902 goto out_put; 903 } 904 905 blk_execute_rq(drive->queue, tape->disk, rq, 0); 906 907 /* calculate the number of transferred bytes and update buffer state */ 908 size -= rq->data_len; 909 tape->cur = tape->buf; 910 if (cmd == REQ_IDETAPE_READ) 911 tape->valid = size; 912 else 913 tape->valid = 0; 914 915 ret = size; 916 if (rq->errors == IDE_DRV_ERROR_GENERAL) 917 ret = -EIO; 918out_put: 919 blk_put_request(rq); 920 return ret; 921} 922 923static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 924{ 925 ide_init_pc(pc); 926 pc->c[0] = INQUIRY; 927 pc->c[4] = 254; 928 pc->req_xfer = 254; 929} 930 931static void idetape_create_rewind_cmd(ide_drive_t *drive, 932 struct ide_atapi_pc *pc) 933{ 934 ide_init_pc(pc); 935 pc->c[0] = REZERO_UNIT; 936 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 937} 938 939static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 940{ 941 ide_init_pc(pc); 942 pc->c[0] = ERASE; 943 pc->c[1] = 1; 944 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 945} 946 947static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 948{ 949 ide_init_pc(pc); 950 pc->c[0] = SPACE; 951 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 952 pc->c[1] = cmd; 953 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 954} 955 956/* Queue up a character device originated write request. */ 957static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) 958{ 959 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 960 961 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks); 962} 963 964static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 965{ 966 idetape_tape_t *tape = drive->driver_data; 967 int blocks; 968 969 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 970 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 971 " but we are not writing.\n"); 972 return; 973 } 974 if (tape->buf) { 975 blocks = tape->valid / tape->blk_size; 976 if (tape->valid % tape->blk_size) { 977 blocks++; 978 memset(tape->buf + tape->valid, 0, 979 tape->blk_size - tape->valid % tape->blk_size); 980 } 981 (void) idetape_add_chrdev_write_request(drive, blocks); 982 } 983 if (tape->buf != NULL) { 984 kfree(tape->buf); 985 tape->buf = NULL; 986 } 987 tape->chrdev_dir = IDETAPE_DIR_NONE; 988} 989 990static int idetape_init_read(ide_drive_t *drive) 991{ 992 idetape_tape_t *tape = drive->driver_data; 993 int bytes_read; 994 995 /* Initialize read operation */ 996 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 997 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 998 ide_tape_flush_merge_buffer(drive); 999 idetape_flush_tape_buffers(drive); 1000 } 1001 if (tape->buf || tape->valid) { 1002 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 1003 tape->valid = 0; 1004 } 1005 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1006 if (!tape->buf) 1007 return -ENOMEM; 1008 tape->chrdev_dir = IDETAPE_DIR_READ; 1009 tape->cur = tape->buf; 1010 1011 /* 1012 * Issue a read 0 command to ensure that DSC handshake is 1013 * switched from completion mode to buffer available mode. 1014 * No point in issuing this if DSC overlap isn't supported, some 1015 * drives (Seagate STT3401A) will return an error. 1016 */ 1017 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1018 bytes_read = idetape_queue_rw_tail(drive, 1019 REQ_IDETAPE_READ, 0); 1020 if (bytes_read < 0) { 1021 kfree(tape->buf); 1022 tape->buf = NULL; 1023 tape->chrdev_dir = IDETAPE_DIR_NONE; 1024 return bytes_read; 1025 } 1026 } 1027 } 1028 1029 return 0; 1030} 1031 1032/* called from idetape_chrdev_read() to service a chrdev read request. */ 1033static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) 1034{ 1035 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); 1036 1037 /* If we are at a filemark, return a read length of 0 */ 1038 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1039 return 0; 1040 1041 idetape_init_read(drive); 1042 1043 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks); 1044} 1045 1046static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1047{ 1048 idetape_tape_t *tape = drive->driver_data; 1049 1050 memset(tape->buf, 0, tape->buffer_size); 1051 1052 while (bcount) { 1053 unsigned int count = min(tape->buffer_size, bcount); 1054 1055 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1056 count / tape->blk_size); 1057 bcount -= count; 1058 } 1059} 1060 1061/* 1062 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1063 * currently support only one partition. 1064 */ 1065static int idetape_rewind_tape(ide_drive_t *drive) 1066{ 1067 struct ide_tape_obj *tape = drive->driver_data; 1068 struct gendisk *disk = tape->disk; 1069 int retval; 1070 struct ide_atapi_pc pc; 1071 1072 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1073 1074 idetape_create_rewind_cmd(drive, &pc); 1075 retval = ide_queue_pc_tail(drive, disk, &pc); 1076 if (retval) 1077 return retval; 1078 1079 idetape_create_read_position_cmd(&pc); 1080 retval = ide_queue_pc_tail(drive, disk, &pc); 1081 if (retval) 1082 return retval; 1083 return 0; 1084} 1085 1086/* mtio.h compatible commands should be issued to the chrdev interface. */ 1087static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1088 unsigned long arg) 1089{ 1090 idetape_tape_t *tape = drive->driver_data; 1091 void __user *argp = (void __user *)arg; 1092 1093 struct idetape_config { 1094 int dsc_rw_frequency; 1095 int dsc_media_access_frequency; 1096 int nr_stages; 1097 } config; 1098 1099 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1100 1101 switch (cmd) { 1102 case 0x0340: 1103 if (copy_from_user(&config, argp, sizeof(config))) 1104 return -EFAULT; 1105 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1106 break; 1107 case 0x0350: 1108 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1109 config.nr_stages = 1; 1110 if (copy_to_user(argp, &config, sizeof(config))) 1111 return -EFAULT; 1112 break; 1113 default: 1114 return -EIO; 1115 } 1116 return 0; 1117} 1118 1119static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1120 int mt_count) 1121{ 1122 idetape_tape_t *tape = drive->driver_data; 1123 struct gendisk *disk = tape->disk; 1124 struct ide_atapi_pc pc; 1125 int retval, count = 0; 1126 int sprev = !!(tape->caps[4] & 0x20); 1127 1128 if (mt_count == 0) 1129 return 0; 1130 if (MTBSF == mt_op || MTBSFM == mt_op) { 1131 if (!sprev) 1132 return -EIO; 1133 mt_count = -mt_count; 1134 } 1135 1136 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1137 tape->valid = 0; 1138 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) 1139 ++count; 1140 ide_tape_discard_merge_buffer(drive, 0); 1141 } 1142 1143 switch (mt_op) { 1144 case MTFSF: 1145 case MTBSF: 1146 idetape_create_space_cmd(&pc, mt_count - count, 1147 IDETAPE_SPACE_OVER_FILEMARK); 1148 return ide_queue_pc_tail(drive, disk, &pc); 1149 case MTFSFM: 1150 case MTBSFM: 1151 if (!sprev) 1152 return -EIO; 1153 retval = idetape_space_over_filemarks(drive, MTFSF, 1154 mt_count - count); 1155 if (retval) 1156 return retval; 1157 count = (MTBSFM == mt_op ? 1 : -1); 1158 return idetape_space_over_filemarks(drive, MTFSF, count); 1159 default: 1160 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1161 mt_op); 1162 return -EIO; 1163 } 1164} 1165 1166/* 1167 * Our character device read / write functions. 1168 * 1169 * The tape is optimized to maximize throughput when it is transferring an 1170 * integral number of the "continuous transfer limit", which is a parameter of 1171 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1172 * 1173 * As of version 1.3 of the driver, the character device provides an abstract 1174 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1175 * same backup/restore procedure is supported. The driver will internally 1176 * convert the requests to the recommended transfer unit, so that an unmatch 1177 * between the user's block size to the recommended size will only result in a 1178 * (slightly) increased driver overhead, but will no longer hit performance. 1179 * This is not applicable to Onstream. 1180 */ 1181static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1182 size_t count, loff_t *ppos) 1183{ 1184 struct ide_tape_obj *tape = file->private_data; 1185 ide_drive_t *drive = tape->drive; 1186 ssize_t bytes_read, temp, actually_read = 0, rc; 1187 ssize_t ret = 0; 1188 u16 ctl = *(u16 *)&tape->caps[12]; 1189 1190 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1191 1192 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1193 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) 1194 if (count > tape->blk_size && 1195 (count % tape->blk_size) == 0) 1196 tape->user_bs_factor = count / tape->blk_size; 1197 } 1198 rc = idetape_init_read(drive); 1199 if (rc < 0) 1200 return rc; 1201 if (count == 0) 1202 return (0); 1203 if (tape->valid) { 1204 actually_read = min_t(unsigned int, tape->valid, count); 1205 if (copy_to_user(buf, tape->cur, actually_read)) 1206 ret = -EFAULT; 1207 buf += actually_read; 1208 count -= actually_read; 1209 tape->cur += actually_read; 1210 tape->valid -= actually_read; 1211 } 1212 while (count >= tape->buffer_size) { 1213 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1214 if (bytes_read <= 0) 1215 goto finish; 1216 if (copy_to_user(buf, tape->cur, bytes_read)) 1217 ret = -EFAULT; 1218 buf += bytes_read; 1219 count -= bytes_read; 1220 actually_read += bytes_read; 1221 } 1222 if (count) { 1223 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1224 if (bytes_read <= 0) 1225 goto finish; 1226 temp = min((unsigned long)count, (unsigned long)bytes_read); 1227 if (copy_to_user(buf, tape->cur, temp)) 1228 ret = -EFAULT; 1229 actually_read += temp; 1230 tape->cur += temp; 1231 tape->valid -= temp; 1232 } 1233finish: 1234 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { 1235 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1236 1237 idetape_space_over_filemarks(drive, MTFSF, 1); 1238 return 0; 1239 } 1240 1241 return ret ? ret : actually_read; 1242} 1243 1244static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1245 size_t count, loff_t *ppos) 1246{ 1247 struct ide_tape_obj *tape = file->private_data; 1248 ide_drive_t *drive = tape->drive; 1249 ssize_t actually_written = 0; 1250 ssize_t ret = 0; 1251 u16 ctl = *(u16 *)&tape->caps[12]; 1252 1253 /* The drive is write protected. */ 1254 if (tape->write_prot) 1255 return -EACCES; 1256 1257 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1258 1259 /* Initialize write operation */ 1260 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 1261 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1262 ide_tape_discard_merge_buffer(drive, 1); 1263 if (tape->buf || tape->valid) { 1264 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 1265 tape->valid = 0; 1266 } 1267 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1268 if (!tape->buf) 1269 return -ENOMEM; 1270 tape->chrdev_dir = IDETAPE_DIR_WRITE; 1271 tape->cur = tape->buf; 1272 1273 /* 1274 * Issue a write 0 command to ensure that DSC handshake is 1275 * switched from completion mode to buffer available mode. No 1276 * point in issuing this if DSC overlap isn't supported, some 1277 * drives (Seagate STT3401A) will return an error. 1278 */ 1279 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 1280 ssize_t retval = idetape_queue_rw_tail(drive, 1281 REQ_IDETAPE_WRITE, 0); 1282 if (retval < 0) { 1283 kfree(tape->buf); 1284 tape->buf = NULL; 1285 tape->chrdev_dir = IDETAPE_DIR_NONE; 1286 return retval; 1287 } 1288 } 1289 } 1290 if (count == 0) 1291 return (0); 1292 if (tape->valid < tape->buffer_size) { 1293 actually_written = min_t(unsigned int, 1294 tape->buffer_size - tape->valid, 1295 count); 1296 if (copy_from_user(tape->cur, buf, actually_written)) 1297 ret = -EFAULT; 1298 buf += actually_written; 1299 count -= actually_written; 1300 tape->cur += actually_written; 1301 tape->valid += actually_written; 1302 1303 if (tape->valid == tape->buffer_size) { 1304 ssize_t retval; 1305 retval = idetape_add_chrdev_write_request(drive, ctl); 1306 if (retval <= 0) 1307 return (retval); 1308 } 1309 } 1310 while (count >= tape->buffer_size) { 1311 ssize_t retval; 1312 if (copy_from_user(tape->cur, buf, tape->buffer_size)) 1313 ret = -EFAULT; 1314 buf += tape->buffer_size; 1315 count -= tape->buffer_size; 1316 retval = idetape_add_chrdev_write_request(drive, ctl); 1317 actually_written += tape->buffer_size; 1318 if (retval <= 0) 1319 return (retval); 1320 } 1321 if (count) { 1322 actually_written += count; 1323 if (copy_from_user(tape->cur, buf, count)) 1324 ret = -EFAULT; 1325 tape->cur += count; 1326 tape->valid += count; 1327 } 1328 return ret ? ret : actually_written; 1329} 1330 1331static int idetape_write_filemark(ide_drive_t *drive) 1332{ 1333 struct ide_tape_obj *tape = drive->driver_data; 1334 struct ide_atapi_pc pc; 1335 1336 /* Write a filemark */ 1337 idetape_create_write_filemark_cmd(drive, &pc, 1); 1338 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1339 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1340 return -EIO; 1341 } 1342 return 0; 1343} 1344 1345/* 1346 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1347 * requested. 1348 * 1349 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1350 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1351 * usually not supported. 1352 * 1353 * The following commands are currently not supported: 1354 * 1355 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1356 * MT_ST_WRITE_THRESHOLD. 1357 */ 1358static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1359{ 1360 idetape_tape_t *tape = drive->driver_data; 1361 struct gendisk *disk = tape->disk; 1362 struct ide_atapi_pc pc; 1363 int i, retval; 1364 1365 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1366 mt_op, mt_count); 1367 1368 switch (mt_op) { 1369 case MTFSF: 1370 case MTFSFM: 1371 case MTBSF: 1372 case MTBSFM: 1373 if (!mt_count) 1374 return 0; 1375 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1376 default: 1377 break; 1378 } 1379 1380 switch (mt_op) { 1381 case MTWEOF: 1382 if (tape->write_prot) 1383 return -EACCES; 1384 ide_tape_discard_merge_buffer(drive, 1); 1385 for (i = 0; i < mt_count; i++) { 1386 retval = idetape_write_filemark(drive); 1387 if (retval) 1388 return retval; 1389 } 1390 return 0; 1391 case MTREW: 1392 ide_tape_discard_merge_buffer(drive, 0); 1393 if (idetape_rewind_tape(drive)) 1394 return -EIO; 1395 return 0; 1396 case MTLOAD: 1397 ide_tape_discard_merge_buffer(drive, 0); 1398 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1399 case MTUNLOAD: 1400 case MTOFFL: 1401 /* 1402 * If door is locked, attempt to unlock before 1403 * attempting to eject. 1404 */ 1405 if (tape->door_locked) { 1406 if (!ide_set_media_lock(drive, disk, 0)) 1407 tape->door_locked = DOOR_UNLOCKED; 1408 } 1409 ide_tape_discard_merge_buffer(drive, 0); 1410 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1411 if (!retval) 1412 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); 1413 return retval; 1414 case MTNOP: 1415 ide_tape_discard_merge_buffer(drive, 0); 1416 return idetape_flush_tape_buffers(drive); 1417 case MTRETEN: 1418 ide_tape_discard_merge_buffer(drive, 0); 1419 return ide_do_start_stop(drive, disk, 1420 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1421 case MTEOM: 1422 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1423 return ide_queue_pc_tail(drive, disk, &pc); 1424 case MTERASE: 1425 (void)idetape_rewind_tape(drive); 1426 idetape_create_erase_cmd(&pc); 1427 return ide_queue_pc_tail(drive, disk, &pc); 1428 case MTSETBLK: 1429 if (mt_count) { 1430 if (mt_count < tape->blk_size || 1431 mt_count % tape->blk_size) 1432 return -EIO; 1433 tape->user_bs_factor = mt_count / tape->blk_size; 1434 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1435 } else 1436 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); 1437 return 0; 1438 case MTSEEK: 1439 ide_tape_discard_merge_buffer(drive, 0); 1440 return idetape_position_tape(drive, 1441 mt_count * tape->user_bs_factor, tape->partition, 0); 1442 case MTSETPART: 1443 ide_tape_discard_merge_buffer(drive, 0); 1444 return idetape_position_tape(drive, 0, mt_count, 0); 1445 case MTFSR: 1446 case MTBSR: 1447 case MTLOCK: 1448 retval = ide_set_media_lock(drive, disk, 1); 1449 if (retval) 1450 return retval; 1451 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1452 return 0; 1453 case MTUNLOCK: 1454 retval = ide_set_media_lock(drive, disk, 0); 1455 if (retval) 1456 return retval; 1457 tape->door_locked = DOOR_UNLOCKED; 1458 return 0; 1459 default: 1460 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1461 mt_op); 1462 return -EIO; 1463 } 1464} 1465 1466/* 1467 * Our character device ioctls. General mtio.h magnetic io commands are 1468 * supported here, and not in the corresponding block interface. Our own 1469 * ide-tape ioctls are supported on both interfaces. 1470 */ 1471static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 1472 unsigned int cmd, unsigned long arg) 1473{ 1474 struct ide_tape_obj *tape = file->private_data; 1475 ide_drive_t *drive = tape->drive; 1476 struct mtop mtop; 1477 struct mtget mtget; 1478 struct mtpos mtpos; 1479 int block_offset = 0, position = tape->first_frame; 1480 void __user *argp = (void __user *)arg; 1481 1482 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 1483 1484 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1485 ide_tape_flush_merge_buffer(drive); 1486 idetape_flush_tape_buffers(drive); 1487 } 1488 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1489 block_offset = tape->valid / 1490 (tape->blk_size * tape->user_bs_factor); 1491 position = idetape_read_position(drive); 1492 if (position < 0) 1493 return -EIO; 1494 } 1495 switch (cmd) { 1496 case MTIOCTOP: 1497 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1498 return -EFAULT; 1499 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1500 case MTIOCGET: 1501 memset(&mtget, 0, sizeof(struct mtget)); 1502 mtget.mt_type = MT_ISSCSI2; 1503 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1504 mtget.mt_dsreg = 1505 ((tape->blk_size * tape->user_bs_factor) 1506 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1507 1508 if (tape->drv_write_prot) 1509 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1510 1511 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1512 return -EFAULT; 1513 return 0; 1514 case MTIOCPOS: 1515 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1516 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1517 return -EFAULT; 1518 return 0; 1519 default: 1520 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1521 ide_tape_discard_merge_buffer(drive, 1); 1522 return idetape_blkdev_ioctl(drive, cmd, arg); 1523 } 1524} 1525 1526/* 1527 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1528 * block size with the reported value. 1529 */ 1530static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1531{ 1532 idetape_tape_t *tape = drive->driver_data; 1533 struct ide_atapi_pc pc; 1534 1535 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1536 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1537 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1538 if (tape->blk_size == 0) { 1539 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1540 "block size, assuming 32k\n"); 1541 tape->blk_size = 32768; 1542 } 1543 return; 1544 } 1545 tape->blk_size = (pc.buf[4 + 5] << 16) + 1546 (pc.buf[4 + 6] << 8) + 1547 pc.buf[4 + 7]; 1548 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 1549} 1550 1551static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1552{ 1553 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1554 ide_drive_t *drive; 1555 idetape_tape_t *tape; 1556 int retval; 1557 1558 if (i >= MAX_HWIFS * MAX_DRIVES) 1559 return -ENXIO; 1560 1561 lock_kernel(); 1562 tape = ide_tape_chrdev_get(i); 1563 if (!tape) { 1564 unlock_kernel(); 1565 return -ENXIO; 1566 } 1567 1568 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1569 1570 /* 1571 * We really want to do nonseekable_open(inode, filp); here, but some 1572 * versions of tar incorrectly call lseek on tapes and bail out if that 1573 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1574 */ 1575 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1576 1577 drive = tape->drive; 1578 1579 filp->private_data = tape; 1580 1581 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { 1582 retval = -EBUSY; 1583 goto out_put_tape; 1584 } 1585 1586 retval = idetape_wait_ready(drive, 60 * HZ); 1587 if (retval) { 1588 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1589 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1590 goto out_put_tape; 1591 } 1592 1593 idetape_read_position(drive); 1594 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) 1595 (void)idetape_rewind_tape(drive); 1596 1597 /* Read block size and write protect status from drive. */ 1598 ide_tape_get_bsize_from_bdesc(drive); 1599 1600 /* Set write protect flag if device is opened as read-only. */ 1601 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1602 tape->write_prot = 1; 1603 else 1604 tape->write_prot = tape->drv_write_prot; 1605 1606 /* Make sure drive isn't write protected if user wants to write. */ 1607 if (tape->write_prot) { 1608 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1609 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1610 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1611 retval = -EROFS; 1612 goto out_put_tape; 1613 } 1614 } 1615 1616 /* Lock the tape drive door so user can't eject. */ 1617 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1618 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1619 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1620 tape->door_locked = DOOR_LOCKED; 1621 } 1622 } 1623 unlock_kernel(); 1624 return 0; 1625 1626out_put_tape: 1627 ide_tape_put(tape); 1628 unlock_kernel(); 1629 return retval; 1630} 1631 1632static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1633{ 1634 idetape_tape_t *tape = drive->driver_data; 1635 1636 ide_tape_flush_merge_buffer(drive); 1637 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1638 if (tape->buf != NULL) { 1639 idetape_pad_zeros(drive, tape->blk_size * 1640 (tape->user_bs_factor - 1)); 1641 kfree(tape->buf); 1642 tape->buf = NULL; 1643 } 1644 idetape_write_filemark(drive); 1645 idetape_flush_tape_buffers(drive); 1646 idetape_flush_tape_buffers(drive); 1647} 1648 1649static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1650{ 1651 struct ide_tape_obj *tape = filp->private_data; 1652 ide_drive_t *drive = tape->drive; 1653 unsigned int minor = iminor(inode); 1654 1655 lock_kernel(); 1656 tape = drive->driver_data; 1657 1658 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1659 1660 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1661 idetape_write_release(drive, minor); 1662 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1663 if (minor < 128) 1664 ide_tape_discard_merge_buffer(drive, 1); 1665 } 1666 1667 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) 1668 (void) idetape_rewind_tape(drive); 1669 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1670 if (tape->door_locked == DOOR_LOCKED) { 1671 if (!ide_set_media_lock(drive, tape->disk, 0)) 1672 tape->door_locked = DOOR_UNLOCKED; 1673 } 1674 } 1675 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); 1676 ide_tape_put(tape); 1677 unlock_kernel(); 1678 return 0; 1679} 1680 1681static void idetape_get_inquiry_results(ide_drive_t *drive) 1682{ 1683 idetape_tape_t *tape = drive->driver_data; 1684 struct ide_atapi_pc pc; 1685 u8 pc_buf[256]; 1686 char fw_rev[4], vendor_id[8], product_id[16]; 1687 1688 idetape_create_inquiry_cmd(&pc); 1689 pc.buf = &pc_buf[0]; 1690 pc.buf_size = sizeof(pc_buf); 1691 1692 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1693 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1694 tape->name); 1695 return; 1696 } 1697 memcpy(vendor_id, &pc.buf[8], 8); 1698 memcpy(product_id, &pc.buf[16], 16); 1699 memcpy(fw_rev, &pc.buf[32], 4); 1700 1701 ide_fixstring(vendor_id, 8, 0); 1702 ide_fixstring(product_id, 16, 0); 1703 ide_fixstring(fw_rev, 4, 0); 1704 1705 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1706 drive->name, tape->name, vendor_id, product_id, fw_rev); 1707} 1708 1709/* 1710 * Ask the tape about its various parameters. In particular, we will adjust our 1711 * data transfer buffer size to the recommended value as returned by the tape. 1712 */ 1713static void idetape_get_mode_sense_results(ide_drive_t *drive) 1714{ 1715 idetape_tape_t *tape = drive->driver_data; 1716 struct ide_atapi_pc pc; 1717 u8 *caps; 1718 u8 speed, max_speed; 1719 1720 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1721 if (ide_queue_pc_tail(drive, tape->disk, &pc)) { 1722 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1723 " some default values\n"); 1724 tape->blk_size = 512; 1725 put_unaligned(52, (u16 *)&tape->caps[12]); 1726 put_unaligned(540, (u16 *)&tape->caps[14]); 1727 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1728 return; 1729 } 1730 caps = pc.buf + 4 + pc.buf[3]; 1731 1732 /* convert to host order and save for later use */ 1733 speed = be16_to_cpup((__be16 *)&caps[14]); 1734 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1735 1736 *(u16 *)&caps[8] = max_speed; 1737 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1738 *(u16 *)&caps[14] = speed; 1739 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1740 1741 if (!speed) { 1742 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1743 "(assuming 650KB/sec)\n", drive->name); 1744 *(u16 *)&caps[14] = 650; 1745 } 1746 if (!max_speed) { 1747 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1748 "(assuming 650KB/sec)\n", drive->name); 1749 *(u16 *)&caps[8] = 650; 1750 } 1751 1752 memcpy(&tape->caps, caps, 20); 1753 1754 /* device lacks locking support according to capabilities page */ 1755 if ((caps[6] & 1) == 0) 1756 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1757 1758 if (caps[7] & 0x02) 1759 tape->blk_size = 512; 1760 else if (caps[7] & 0x04) 1761 tape->blk_size = 1024; 1762} 1763 1764#ifdef CONFIG_IDE_PROC_FS 1765#define ide_tape_devset_get(name, field) \ 1766static int get_##name(ide_drive_t *drive) \ 1767{ \ 1768 idetape_tape_t *tape = drive->driver_data; \ 1769 return tape->field; \ 1770} 1771 1772#define ide_tape_devset_set(name, field) \ 1773static int set_##name(ide_drive_t *drive, int arg) \ 1774{ \ 1775 idetape_tape_t *tape = drive->driver_data; \ 1776 tape->field = arg; \ 1777 return 0; \ 1778} 1779 1780#define ide_tape_devset_rw_field(_name, _field) \ 1781ide_tape_devset_get(_name, _field) \ 1782ide_tape_devset_set(_name, _field) \ 1783IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1784 1785#define ide_tape_devset_r_field(_name, _field) \ 1786ide_tape_devset_get(_name, _field) \ 1787IDE_DEVSET(_name, 0, get_##_name, NULL) 1788 1789static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1790static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1791static int divf_buffer(ide_drive_t *drive) { return 2; } 1792static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1793 1794ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1795 1796ide_tape_devset_rw_field(debug_mask, debug_mask); 1797ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1798 1799ide_tape_devset_r_field(avg_speed, avg_speed); 1800ide_tape_devset_r_field(speed, caps[14]); 1801ide_tape_devset_r_field(buffer, caps[16]); 1802ide_tape_devset_r_field(buffer_size, buffer_size); 1803 1804static const struct ide_proc_devset idetape_settings[] = { 1805 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1806 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1807 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1808 __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), 1809 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1810 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1811 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1812 mulf_tdsc, divf_tdsc), 1813 { NULL }, 1814}; 1815#endif 1816 1817/* 1818 * The function below is called to: 1819 * 1820 * 1. Initialize our various state variables. 1821 * 2. Ask the tape for its capabilities. 1822 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1823 * is chosen based on the recommendation which we received in step 2. 1824 * 1825 * Note that at this point ide.c already assigned us an irq, so that we can 1826 * queue requests here and wait for their completion. 1827 */ 1828static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1829{ 1830 unsigned long t; 1831 int speed; 1832 int buffer_size; 1833 u16 *ctl = (u16 *)&tape->caps[12]; 1834 1835 drive->pc_callback = ide_tape_callback; 1836 1837 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1838 1839 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1840 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1841 tape->name); 1842 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1843 } 1844 1845 /* Seagate Travan drives do not support DSC overlap. */ 1846 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1847 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1848 1849 tape->minor = minor; 1850 tape->name[0] = 'h'; 1851 tape->name[1] = 't'; 1852 tape->name[2] = '0' + minor; 1853 tape->chrdev_dir = IDETAPE_DIR_NONE; 1854 1855 idetape_get_inquiry_results(drive); 1856 idetape_get_mode_sense_results(drive); 1857 ide_tape_get_bsize_from_bdesc(drive); 1858 tape->user_bs_factor = 1; 1859 tape->buffer_size = *ctl * tape->blk_size; 1860 while (tape->buffer_size > 0xffff) { 1861 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1862 *ctl /= 2; 1863 tape->buffer_size = *ctl * tape->blk_size; 1864 } 1865 buffer_size = tape->buffer_size; 1866 1867 /* select the "best" DSC read/write polling freq */ 1868 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1869 1870 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1871 1872 /* 1873 * Ensure that the number we got makes sense; limit it within 1874 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1875 */ 1876 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1877 IDETAPE_DSC_RW_MAX); 1878 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1879 "%lums tDSC%s\n", 1880 drive->name, tape->name, *(u16 *)&tape->caps[14], 1881 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1882 tape->buffer_size / 1024, 1883 tape->best_dsc_rw_freq * 1000 / HZ, 1884 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1885 1886 ide_proc_register_driver(drive, tape->driver); 1887} 1888 1889static void ide_tape_remove(ide_drive_t *drive) 1890{ 1891 idetape_tape_t *tape = drive->driver_data; 1892 1893 ide_proc_unregister_driver(drive, tape->driver); 1894 device_del(&tape->dev); 1895 ide_unregister_region(tape->disk); 1896 1897 mutex_lock(&idetape_ref_mutex); 1898 put_device(&tape->dev); 1899 mutex_unlock(&idetape_ref_mutex); 1900} 1901 1902static void ide_tape_release(struct device *dev) 1903{ 1904 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1905 ide_drive_t *drive = tape->drive; 1906 struct gendisk *g = tape->disk; 1907 1908 BUG_ON(tape->valid); 1909 1910 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1911 drive->driver_data = NULL; 1912 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1913 device_destroy(idetape_sysfs_class, 1914 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1915 idetape_devs[tape->minor] = NULL; 1916 g->private_data = NULL; 1917 put_disk(g); 1918 kfree(tape); 1919} 1920 1921#ifdef CONFIG_IDE_PROC_FS 1922static int proc_idetape_read_name 1923 (char *page, char **start, off_t off, int count, int *eof, void *data) 1924{ 1925 ide_drive_t *drive = (ide_drive_t *) data; 1926 idetape_tape_t *tape = drive->driver_data; 1927 char *out = page; 1928 int len; 1929 1930 len = sprintf(out, "%s\n", tape->name); 1931 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 1932} 1933 1934static ide_proc_entry_t idetape_proc[] = { 1935 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 1936 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 1937 { NULL, 0, NULL, NULL } 1938}; 1939 1940static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1941{ 1942 return idetape_proc; 1943} 1944 1945static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1946{ 1947 return idetape_settings; 1948} 1949#endif 1950 1951static int ide_tape_probe(ide_drive_t *); 1952 1953static struct ide_driver idetape_driver = { 1954 .gen_driver = { 1955 .owner = THIS_MODULE, 1956 .name = "ide-tape", 1957 .bus = &ide_bus_type, 1958 }, 1959 .probe = ide_tape_probe, 1960 .remove = ide_tape_remove, 1961 .version = IDETAPE_VERSION, 1962 .do_request = idetape_do_request, 1963#ifdef CONFIG_IDE_PROC_FS 1964 .proc_entries = ide_tape_proc_entries, 1965 .proc_devsets = ide_tape_proc_devsets, 1966#endif 1967}; 1968 1969/* Our character device supporting functions, passed to register_chrdev. */ 1970static const struct file_operations idetape_fops = { 1971 .owner = THIS_MODULE, 1972 .read = idetape_chrdev_read, 1973 .write = idetape_chrdev_write, 1974 .ioctl = idetape_chrdev_ioctl, 1975 .open = idetape_chrdev_open, 1976 .release = idetape_chrdev_release, 1977}; 1978 1979static int idetape_open(struct block_device *bdev, fmode_t mode) 1980{ 1981 struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); 1982 1983 if (!tape) 1984 return -ENXIO; 1985 1986 return 0; 1987} 1988 1989static int idetape_release(struct gendisk *disk, fmode_t mode) 1990{ 1991 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1992 1993 ide_tape_put(tape); 1994 return 0; 1995} 1996 1997static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1998 unsigned int cmd, unsigned long arg) 1999{ 2000 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 2001 ide_drive_t *drive = tape->drive; 2002 int err = generic_ide_ioctl(drive, bdev, cmd, arg); 2003 if (err == -EINVAL) 2004 err = idetape_blkdev_ioctl(drive, cmd, arg); 2005 return err; 2006} 2007 2008static struct block_device_operations idetape_block_ops = { 2009 .owner = THIS_MODULE, 2010 .open = idetape_open, 2011 .release = idetape_release, 2012 .locked_ioctl = idetape_ioctl, 2013}; 2014 2015static int ide_tape_probe(ide_drive_t *drive) 2016{ 2017 idetape_tape_t *tape; 2018 struct gendisk *g; 2019 int minor; 2020 2021 if (!strstr("ide-tape", drive->driver_req)) 2022 goto failed; 2023 2024 if (drive->media != ide_tape) 2025 goto failed; 2026 2027 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 2028 ide_check_atapi_device(drive, DRV_NAME) == 0) { 2029 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 2030 " the driver\n", drive->name); 2031 goto failed; 2032 } 2033 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 2034 if (tape == NULL) { 2035 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 2036 drive->name); 2037 goto failed; 2038 } 2039 2040 g = alloc_disk(1 << PARTN_BITS); 2041 if (!g) 2042 goto out_free_tape; 2043 2044 ide_init_disk(g, drive); 2045 2046 tape->dev.parent = &drive->gendev; 2047 tape->dev.release = ide_tape_release; 2048 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 2049 2050 if (device_register(&tape->dev)) 2051 goto out_free_disk; 2052 2053 tape->drive = drive; 2054 tape->driver = &idetape_driver; 2055 tape->disk = g; 2056 2057 g->private_data = &tape->driver; 2058 2059 drive->driver_data = tape; 2060 2061 mutex_lock(&idetape_ref_mutex); 2062 for (minor = 0; idetape_devs[minor]; minor++) 2063 ; 2064 idetape_devs[minor] = tape; 2065 mutex_unlock(&idetape_ref_mutex); 2066 2067 idetape_setup(drive, tape, minor); 2068 2069 device_create(idetape_sysfs_class, &drive->gendev, 2070 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 2071 device_create(idetape_sysfs_class, &drive->gendev, 2072 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2073 "n%s", tape->name); 2074 2075 g->fops = &idetape_block_ops; 2076 ide_register_region(g); 2077 2078 return 0; 2079 2080out_free_disk: 2081 put_disk(g); 2082out_free_tape: 2083 kfree(tape); 2084failed: 2085 return -ENODEV; 2086} 2087 2088static void __exit idetape_exit(void) 2089{ 2090 driver_unregister(&idetape_driver.gen_driver); 2091 class_destroy(idetape_sysfs_class); 2092 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2093} 2094 2095static int __init idetape_init(void) 2096{ 2097 int error = 1; 2098 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2099 if (IS_ERR(idetape_sysfs_class)) { 2100 idetape_sysfs_class = NULL; 2101 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2102 error = -EBUSY; 2103 goto out; 2104 } 2105 2106 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2107 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2108 " interface\n"); 2109 error = -EBUSY; 2110 goto out_free_class; 2111 } 2112 2113 error = driver_register(&idetape_driver.gen_driver); 2114 if (error) 2115 goto out_free_driver; 2116 2117 return 0; 2118 2119out_free_driver: 2120 driver_unregister(&idetape_driver.gen_driver); 2121out_free_class: 2122 class_destroy(idetape_sysfs_class); 2123out: 2124 return error; 2125} 2126 2127MODULE_ALIAS("ide:*m-tape*"); 2128module_init(idetape_init); 2129module_exit(idetape_exit); 2130MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2131MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2132MODULE_LICENSE("GPL"); 2133