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/seq_file.h> 35#include <linux/smp_lock.h> 36#include <linux/slab.h> 37#include <linux/pci.h> 38#include <linux/ide.h> 39#include <linux/smp_lock.h> 40#include <linux/completion.h> 41#include <linux/bitops.h> 42#include <linux/mutex.h> 43#include <scsi/scsi.h> 44 45#include <asm/byteorder.h> 46#include <linux/irq.h> 47#include <linux/uaccess.h> 48#include <linux/io.h> 49#include <asm/unaligned.h> 50#include <linux/mtio.h> 51 52/* define to see debug info */ 53#undef IDETAPE_DEBUG_LOG 54 55#ifdef IDETAPE_DEBUG_LOG 56#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args) 57#else 58#define ide_debug_log(lvl, fmt, args...) do {} while (0) 59#endif 60 61/**************************** Tunable parameters *****************************/ 62/* 63 * After each failed packet command we issue a request sense command and retry 64 * the packet command IDETAPE_MAX_PC_RETRIES times. 65 * 66 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 67 */ 68#define IDETAPE_MAX_PC_RETRIES 3 69 70/* 71 * The following parameter is used to select the point in the internal tape fifo 72 * in which we will start to refill the buffer. Decreasing the following 73 * parameter will improve the system's latency and interactive response, while 74 * using a high value might improve system throughput. 75 */ 76#define IDETAPE_FIFO_THRESHOLD 2 77 78/* 79 * DSC polling parameters. 80 * 81 * Polling for DSC (a single bit in the status register) is a very important 82 * function in ide-tape. There are two cases in which we poll for DSC: 83 * 84 * 1. Before a read/write packet command, to ensure that we can transfer data 85 * from/to the tape's data buffers, without causing an actual media access. 86 * In case the tape is not ready yet, we take out our request from the device 87 * request queue, so that ide.c could service requests from the other device 88 * on the same interface in the meantime. 89 * 90 * 2. After the successful initialization of a "media access packet command", 91 * which is a command that can take a long time to complete (the interval can 92 * range from several seconds to even an hour). Again, we postpone our request 93 * in the middle to free the bus for the other device. The polling frequency 94 * here should be lower than the read/write frequency since those media access 95 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 96 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 97 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 98 * 99 * We also set a timeout for the timer, in case something goes wrong. The 100 * timeout should be longer then the maximum execution time of a tape operation. 101 */ 102 103/* DSC timings. */ 104#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 105#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 106#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 107#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 108#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 109#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 110#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 111 112/*************************** End of tunable parameters ***********************/ 113 114/* tape directions */ 115enum { 116 IDETAPE_DIR_NONE = (1 << 0), 117 IDETAPE_DIR_READ = (1 << 1), 118 IDETAPE_DIR_WRITE = (1 << 2), 119}; 120 121/* Tape door status */ 122#define DOOR_UNLOCKED 0 123#define DOOR_LOCKED 1 124#define DOOR_EXPLICITLY_LOCKED 2 125 126/* Some defines for the SPACE command */ 127#define IDETAPE_SPACE_OVER_FILEMARK 1 128#define IDETAPE_SPACE_TO_EOD 3 129 130/* Some defines for the LOAD UNLOAD command */ 131#define IDETAPE_LU_LOAD_MASK 1 132#define IDETAPE_LU_RETENSION_MASK 2 133#define IDETAPE_LU_EOT_MASK 4 134 135/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 136#define IDETAPE_BLOCK_DESCRIPTOR 0 137#define IDETAPE_CAPABILITIES_PAGE 0x2a 138 139/* 140 * Most of our global data which we need to save even as we leave the driver due 141 * to an interrupt or a timer event is stored in the struct defined below. 142 */ 143typedef struct ide_tape_obj { 144 ide_drive_t *drive; 145 struct ide_driver *driver; 146 struct gendisk *disk; 147 struct device dev; 148 149 /* used by REQ_IDETAPE_{READ,WRITE} requests */ 150 struct ide_atapi_pc queued_pc; 151 152 /* 153 * DSC polling variables. 154 * 155 * While polling for DSC we use postponed_rq to postpone the current 156 * request so that ide.c will be able to service pending requests on the 157 * other device. Note that at most we will have only one DSC (usually 158 * data transfer) request in the device request queue. 159 */ 160 bool postponed_rq; 161 162 /* The time in which we started polling for DSC */ 163 unsigned long dsc_polling_start; 164 /* Timer used to poll for dsc */ 165 struct timer_list dsc_timer; 166 /* Read/Write dsc polling frequency */ 167 unsigned long best_dsc_rw_freq; 168 unsigned long dsc_poll_freq; 169 unsigned long dsc_timeout; 170 171 /* Read position information */ 172 u8 partition; 173 /* Current block */ 174 unsigned int first_frame; 175 176 /* Last error information */ 177 u8 sense_key, asc, ascq; 178 179 /* Character device operation */ 180 unsigned int minor; 181 /* device name */ 182 char name[4]; 183 /* Current character device data transfer direction */ 184 u8 chrdev_dir; 185 186 /* tape block size, usually 512 or 1024 bytes */ 187 unsigned short blk_size; 188 int user_bs_factor; 189 190 /* Copy of the tape's Capabilities and Mechanical Page */ 191 u8 caps[20]; 192 193 /* 194 * Active data transfer request parameters. 195 * 196 * At most, there is only one ide-tape originated data transfer request 197 * in the device request queue. This allows ide.c to easily service 198 * requests from the other device when we postpone our active request. 199 */ 200 201 /* Data buffer size chosen based on the tape's recommendation */ 202 int buffer_size; 203 /* Staging buffer of buffer_size bytes */ 204 void *buf; 205 /* The read/write cursor */ 206 void *cur; 207 /* The number of valid bytes in buf */ 208 size_t valid; 209 210 /* Measures average tape speed */ 211 unsigned long avg_time; 212 int avg_size; 213 int avg_speed; 214 215 /* the door is currently locked */ 216 int door_locked; 217 /* the tape hardware is write protected */ 218 char drv_write_prot; 219 /* the tape is write protected (hardware or opened as read-only) */ 220 char write_prot; 221} idetape_tape_t; 222 223static DEFINE_MUTEX(idetape_ref_mutex); 224 225static DEFINE_MUTEX(idetape_chrdev_mutex); 226 227static struct class *idetape_sysfs_class; 228 229static void ide_tape_release(struct device *); 230 231static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 232 233static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, 234 unsigned int i) 235{ 236 struct ide_tape_obj *tape = NULL; 237 238 mutex_lock(&idetape_ref_mutex); 239 240 if (cdev) 241 tape = idetape_devs[i]; 242 else 243 tape = ide_drv_g(disk, ide_tape_obj); 244 245 if (tape) { 246 if (ide_device_get(tape->drive)) 247 tape = NULL; 248 else 249 get_device(&tape->dev); 250 } 251 252 mutex_unlock(&idetape_ref_mutex); 253 return tape; 254} 255 256static void ide_tape_put(struct ide_tape_obj *tape) 257{ 258 ide_drive_t *drive = tape->drive; 259 260 mutex_lock(&idetape_ref_mutex); 261 put_device(&tape->dev); 262 ide_device_put(drive); 263 mutex_unlock(&idetape_ref_mutex); 264} 265 266/* 267 * called on each failed packet command retry to analyze the request sense. We 268 * currently do not utilize this information. 269 */ 270static void idetape_analyze_error(ide_drive_t *drive) 271{ 272 idetape_tape_t *tape = drive->driver_data; 273 struct ide_atapi_pc *pc = drive->failed_pc; 274 struct request *rq = drive->hwif->rq; 275 u8 *sense = bio_data(rq->bio); 276 277 tape->sense_key = sense[2] & 0xF; 278 tape->asc = sense[12]; 279 tape->ascq = sense[13]; 280 281 ide_debug_log(IDE_DBG_FUNC, 282 "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x", 283 rq->cmd[0], tape->sense_key, tape->asc, tape->ascq); 284 285 /* correct remaining bytes to transfer */ 286 if (pc->flags & PC_FLAG_DMA_ERROR) 287 rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); 288 289 /* 290 * If error was the result of a zero-length read or write command, 291 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 292 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 293 */ 294 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 295 /* length == 0 */ 296 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 297 if (tape->sense_key == 5) { 298 /* don't report an error, everything's ok */ 299 pc->error = 0; 300 /* don't retry read/write */ 301 pc->flags |= PC_FLAG_ABORT; 302 } 303 } 304 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 305 pc->error = IDE_DRV_ERROR_FILEMARK; 306 pc->flags |= PC_FLAG_ABORT; 307 } 308 if (pc->c[0] == WRITE_6) { 309 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 310 && tape->asc == 0x0 && tape->ascq == 0x2)) { 311 pc->error = IDE_DRV_ERROR_EOD; 312 pc->flags |= PC_FLAG_ABORT; 313 } 314 } 315 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 316 if (tape->sense_key == 8) { 317 pc->error = IDE_DRV_ERROR_EOD; 318 pc->flags |= PC_FLAG_ABORT; 319 } 320 if (!(pc->flags & PC_FLAG_ABORT) && 321 (blk_rq_bytes(rq) - rq->resid_len)) 322 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 323 } 324} 325 326static void ide_tape_handle_dsc(ide_drive_t *); 327 328static int ide_tape_callback(ide_drive_t *drive, int dsc) 329{ 330 idetape_tape_t *tape = drive->driver_data; 331 struct ide_atapi_pc *pc = drive->pc; 332 struct request *rq = drive->hwif->rq; 333 int uptodate = pc->error ? 0 : 1; 334 int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; 335 336 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0], 337 dsc, err); 338 339 if (dsc) 340 ide_tape_handle_dsc(drive); 341 342 if (drive->failed_pc == pc) 343 drive->failed_pc = NULL; 344 345 if (pc->c[0] == REQUEST_SENSE) { 346 if (uptodate) 347 idetape_analyze_error(drive); 348 else 349 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 350 "itself - Aborting request!\n"); 351 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 352 unsigned int blocks = 353 (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; 354 355 tape->avg_size += blocks * tape->blk_size; 356 357 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 358 tape->avg_speed = tape->avg_size * HZ / 359 (jiffies - tape->avg_time) / 1024; 360 tape->avg_size = 0; 361 tape->avg_time = jiffies; 362 } 363 364 tape->first_frame += blocks; 365 366 if (pc->error) { 367 uptodate = 0; 368 err = pc->error; 369 } 370 } 371 rq->errors = err; 372 373 return uptodate; 374} 375 376/* 377 * Postpone the current request so that ide.c will be able to service requests 378 * from another device on the same port while we are polling for DSC. 379 */ 380static void ide_tape_stall_queue(ide_drive_t *drive) 381{ 382 idetape_tape_t *tape = drive->driver_data; 383 384 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu", 385 drive->hwif->rq->cmd[0], tape->dsc_poll_freq); 386 387 tape->postponed_rq = true; 388 389 ide_stall_queue(drive, tape->dsc_poll_freq); 390} 391 392static void ide_tape_handle_dsc(ide_drive_t *drive) 393{ 394 idetape_tape_t *tape = drive->driver_data; 395 396 /* Media access command */ 397 tape->dsc_polling_start = jiffies; 398 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 399 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 400 /* Allow ide.c to handle other requests */ 401 ide_tape_stall_queue(drive); 402} 403 404/* 405 * Packet Command Interface 406 * 407 * The current Packet Command is available in drive->pc, and will not change 408 * until we finish handling it. Each packet command is associated with a 409 * callback function that will be called when the command is finished. 410 * 411 * The handling will be done in three stages: 412 * 413 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set 414 * the interrupt handler to ide_pc_intr. 415 * 416 * 2. On each interrupt, ide_pc_intr will be called. This step will be 417 * repeated until the device signals us that no more interrupts will be issued. 418 * 419 * 3. ATAPI Tape media access commands have immediate status with a delayed 420 * process. In case of a successful initiation of a media access packet command, 421 * the DSC bit will be set when the actual execution of the command is finished. 422 * Since the tape drive will not issue an interrupt, we have to poll for this 423 * event. In this case, we define the request as "low priority request" by 424 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 425 * exit the driver. 426 * 427 * ide.c will then give higher priority to requests which originate from the 428 * other device, until will change rq_status to RQ_ACTIVE. 429 * 430 * 4. When the packet command is finished, it will be checked for errors. 431 * 432 * 5. In case an error was found, we queue a request sense packet command in 433 * front of the request queue and retry the operation up to 434 * IDETAPE_MAX_PC_RETRIES times. 435 * 436 * 6. In case no error was found, or we decided to give up and not to retry 437 * again, the callback function will be called and then we will handle the next 438 * request. 439 */ 440 441static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, 442 struct ide_cmd *cmd, 443 struct ide_atapi_pc *pc) 444{ 445 idetape_tape_t *tape = drive->driver_data; 446 struct request *rq = drive->hwif->rq; 447 448 if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 449 drive->failed_pc = pc; 450 451 /* Set the current packet command */ 452 drive->pc = pc; 453 454 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 455 (pc->flags & PC_FLAG_ABORT)) { 456 457 /* 458 * We will "abort" retrying a packet command in case legitimate 459 * error code was received (crossing a filemark, or end of the 460 * media, for example). 461 */ 462 if (!(pc->flags & PC_FLAG_ABORT)) { 463 if (!(pc->c[0] == TEST_UNIT_READY && 464 tape->sense_key == 2 && tape->asc == 4 && 465 (tape->ascq == 1 || tape->ascq == 8))) { 466 printk(KERN_ERR "ide-tape: %s: I/O error, " 467 "pc = %2x, key = %2x, " 468 "asc = %2x, ascq = %2x\n", 469 tape->name, pc->c[0], 470 tape->sense_key, tape->asc, 471 tape->ascq); 472 } 473 /* Giving up */ 474 pc->error = IDE_DRV_ERROR_GENERAL; 475 } 476 477 drive->failed_pc = NULL; 478 drive->pc_callback(drive, 0); 479 ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); 480 return ide_stopped; 481 } 482 ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries, 483 pc->c[0]); 484 485 pc->retries++; 486 487 return ide_issue_pc(drive, cmd); 488} 489 490/* A mode sense command is used to "sense" tape parameters. */ 491static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 492{ 493 ide_init_pc(pc); 494 pc->c[0] = MODE_SENSE; 495 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 496 /* DBD = 1 - Don't return block descriptors */ 497 pc->c[1] = 8; 498 pc->c[2] = page_code; 499 /* 500 * Changed pc->c[3] to 0 (255 will at best return unused info). 501 * 502 * For SCSI this byte is defined as subpage instead of high byte 503 * of length and some IDE drives seem to interpret it this way 504 * and return an error when 255 is used. 505 */ 506 pc->c[3] = 0; 507 /* We will just discard data in that case */ 508 pc->c[4] = 255; 509 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 510 pc->req_xfer = 12; 511 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 512 pc->req_xfer = 24; 513 else 514 pc->req_xfer = 50; 515} 516 517static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 518{ 519 ide_hwif_t *hwif = drive->hwif; 520 idetape_tape_t *tape = drive->driver_data; 521 struct ide_atapi_pc *pc = drive->pc; 522 u8 stat; 523 524 stat = hwif->tp_ops->read_status(hwif); 525 526 if (stat & ATA_DSC) { 527 if (stat & ATA_ERR) { 528 /* Error detected */ 529 if (pc->c[0] != TEST_UNIT_READY) 530 printk(KERN_ERR "ide-tape: %s: I/O error, ", 531 tape->name); 532 /* Retry operation */ 533 ide_retry_pc(drive); 534 return ide_stopped; 535 } 536 pc->error = 0; 537 } else { 538 pc->error = IDE_DRV_ERROR_GENERAL; 539 drive->failed_pc = NULL; 540 } 541 drive->pc_callback(drive, 0); 542 return ide_stopped; 543} 544 545static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 546 struct ide_atapi_pc *pc, struct request *rq, 547 u8 opcode) 548{ 549 unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); 550 551 ide_init_pc(pc); 552 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 553 pc->c[1] = 1; 554 555 if (blk_rq_bytes(rq) == tape->buffer_size) 556 pc->flags |= PC_FLAG_DMA_OK; 557 558 if (opcode == READ_6) 559 pc->c[0] = READ_6; 560 else if (opcode == WRITE_6) { 561 pc->c[0] = WRITE_6; 562 pc->flags |= PC_FLAG_WRITING; 563 } 564 565 memcpy(rq->cmd, pc->c, 12); 566} 567 568static ide_startstop_t idetape_do_request(ide_drive_t *drive, 569 struct request *rq, sector_t block) 570{ 571 ide_hwif_t *hwif = drive->hwif; 572 idetape_tape_t *tape = drive->driver_data; 573 struct ide_atapi_pc *pc = NULL; 574 struct ide_cmd cmd; 575 u8 stat; 576 577 ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u", 578 rq->cmd[0], (unsigned long long)blk_rq_pos(rq), 579 blk_rq_sectors(rq)); 580 581 BUG_ON(!(rq->cmd_type == REQ_TYPE_SPECIAL || 582 rq->cmd_type == REQ_TYPE_SENSE)); 583 584 /* Retry a failed packet command */ 585 if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { 586 pc = drive->failed_pc; 587 goto out; 588 } 589 590 /* 591 * If the tape is still busy, postpone our request and service 592 * the other device meanwhile. 593 */ 594 stat = hwif->tp_ops->read_status(hwif); 595 596 if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && 597 (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) 598 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 599 600 if (drive->dev_flags & IDE_DFLAG_POST_RESET) { 601 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; 602 drive->dev_flags &= ~IDE_DFLAG_POST_RESET; 603 } 604 605 if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && 606 !(stat & ATA_DSC)) { 607 if (!tape->postponed_rq) { 608 tape->dsc_polling_start = jiffies; 609 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 610 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 611 } else if (time_after(jiffies, tape->dsc_timeout)) { 612 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 613 tape->name); 614 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 615 idetape_media_access_finished(drive); 616 return ide_stopped; 617 } else { 618 return ide_do_reset(drive); 619 } 620 } else if (time_after(jiffies, 621 tape->dsc_polling_start + 622 IDETAPE_DSC_MA_THRESHOLD)) 623 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 624 ide_tape_stall_queue(drive); 625 return ide_stopped; 626 } else { 627 drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; 628 tape->postponed_rq = false; 629 } 630 631 if (rq->cmd[13] & REQ_IDETAPE_READ) { 632 pc = &tape->queued_pc; 633 ide_tape_create_rw_cmd(tape, pc, rq, READ_6); 634 goto out; 635 } 636 if (rq->cmd[13] & REQ_IDETAPE_WRITE) { 637 pc = &tape->queued_pc; 638 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); 639 goto out; 640 } 641 if (rq->cmd[13] & REQ_IDETAPE_PC1) { 642 pc = (struct ide_atapi_pc *)rq->special; 643 rq->cmd[13] &= ~(REQ_IDETAPE_PC1); 644 rq->cmd[13] |= REQ_IDETAPE_PC2; 645 goto out; 646 } 647 if (rq->cmd[13] & REQ_IDETAPE_PC2) { 648 idetape_media_access_finished(drive); 649 return ide_stopped; 650 } 651 BUG(); 652 653out: 654 /* prepare sense request for this command */ 655 ide_prep_sense(drive, rq); 656 657 memset(&cmd, 0, sizeof(cmd)); 658 659 if (rq_data_dir(rq)) 660 cmd.tf_flags |= IDE_TFLAG_WRITE; 661 662 cmd.rq = rq; 663 664 ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); 665 ide_map_sg(drive, &cmd); 666 667 return ide_tape_issue_pc(drive, &cmd, pc); 668} 669 670/* 671 * Write a filemark if write_filemark=1. Flush the device buffers without 672 * writing a filemark otherwise. 673 */ 674static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 675 struct ide_atapi_pc *pc, int write_filemark) 676{ 677 ide_init_pc(pc); 678 pc->c[0] = WRITE_FILEMARKS; 679 pc->c[4] = write_filemark; 680 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 681} 682 683static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 684{ 685 idetape_tape_t *tape = drive->driver_data; 686 struct gendisk *disk = tape->disk; 687 int load_attempted = 0; 688 689 /* Wait for the tape to become ready */ 690 set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); 691 timeout += jiffies; 692 while (time_before(jiffies, timeout)) { 693 if (ide_do_test_unit_ready(drive, disk) == 0) 694 return 0; 695 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 696 || (tape->asc == 0x3A)) { 697 /* no media */ 698 if (load_attempted) 699 return -ENOMEDIUM; 700 ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 701 load_attempted = 1; 702 /* not about to be ready */ 703 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 704 (tape->ascq == 1 || tape->ascq == 8))) 705 return -EIO; 706 msleep(100); 707 } 708 return -EIO; 709} 710 711static int idetape_flush_tape_buffers(ide_drive_t *drive) 712{ 713 struct ide_tape_obj *tape = drive->driver_data; 714 struct ide_atapi_pc pc; 715 int rc; 716 717 idetape_create_write_filemark_cmd(drive, &pc, 0); 718 rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); 719 if (rc) 720 return rc; 721 idetape_wait_ready(drive, 60 * 5 * HZ); 722 return 0; 723} 724 725static int ide_tape_read_position(ide_drive_t *drive) 726{ 727 idetape_tape_t *tape = drive->driver_data; 728 struct ide_atapi_pc pc; 729 u8 buf[20]; 730 731 ide_debug_log(IDE_DBG_FUNC, "enter"); 732 733 /* prep cmd */ 734 ide_init_pc(&pc); 735 pc.c[0] = READ_POSITION; 736 pc.req_xfer = 20; 737 738 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) 739 return -1; 740 741 if (!pc.error) { 742 ide_debug_log(IDE_DBG_FUNC, "BOP - %s", 743 (buf[0] & 0x80) ? "Yes" : "No"); 744 ide_debug_log(IDE_DBG_FUNC, "EOP - %s", 745 (buf[0] & 0x40) ? "Yes" : "No"); 746 747 if (buf[0] & 0x4) { 748 printk(KERN_INFO "ide-tape: Block location is unknown" 749 "to the tape\n"); 750 clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), 751 &drive->atapi_flags); 752 return -1; 753 } else { 754 ide_debug_log(IDE_DBG_FUNC, "Block Location: %u", 755 be32_to_cpup((__be32 *)&buf[4])); 756 757 tape->partition = buf[1]; 758 tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); 759 set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), 760 &drive->atapi_flags); 761 } 762 } 763 764 return tape->first_frame; 765} 766 767static void idetape_create_locate_cmd(ide_drive_t *drive, 768 struct ide_atapi_pc *pc, 769 unsigned int block, u8 partition, int skip) 770{ 771 ide_init_pc(pc); 772 pc->c[0] = POSITION_TO_ELEMENT; 773 pc->c[1] = 2; 774 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 775 pc->c[8] = partition; 776 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 777} 778 779static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 780{ 781 idetape_tape_t *tape = drive->driver_data; 782 783 if (tape->chrdev_dir != IDETAPE_DIR_READ) 784 return; 785 786 clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); 787 tape->valid = 0; 788 if (tape->buf != NULL) { 789 kfree(tape->buf); 790 tape->buf = NULL; 791 } 792 793 tape->chrdev_dir = IDETAPE_DIR_NONE; 794} 795 796/* 797 * Position the tape to the requested block using the LOCATE packet command. 798 * A READ POSITION command is then issued to check where we are positioned. Like 799 * all higher level operations, we queue the commands at the tail of the request 800 * queue and wait for their completion. 801 */ 802static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 803 u8 partition, int skip) 804{ 805 idetape_tape_t *tape = drive->driver_data; 806 struct gendisk *disk = tape->disk; 807 int ret; 808 struct ide_atapi_pc pc; 809 810 if (tape->chrdev_dir == IDETAPE_DIR_READ) 811 __ide_tape_discard_merge_buffer(drive); 812 idetape_wait_ready(drive, 60 * 5 * HZ); 813 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 814 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 815 if (ret) 816 return ret; 817 818 ret = ide_tape_read_position(drive); 819 if (ret < 0) 820 return ret; 821 return 0; 822} 823 824static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 825 int restore_position) 826{ 827 idetape_tape_t *tape = drive->driver_data; 828 int seek, position; 829 830 __ide_tape_discard_merge_buffer(drive); 831 if (restore_position) { 832 position = ide_tape_read_position(drive); 833 seek = position > 0 ? position : 0; 834 if (idetape_position_tape(drive, seek, 0, 0)) { 835 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 836 " %s\n", tape->name, __func__); 837 return; 838 } 839 } 840} 841 842/* 843 * Generate a read/write request for the block device interface and wait for it 844 * to be serviced. 845 */ 846static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) 847{ 848 idetape_tape_t *tape = drive->driver_data; 849 struct request *rq; 850 int ret; 851 852 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size); 853 854 BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); 855 BUG_ON(size < 0 || size % tape->blk_size); 856 857 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 858 rq->cmd_type = REQ_TYPE_SPECIAL; 859 rq->cmd[13] = cmd; 860 rq->rq_disk = tape->disk; 861 rq->__sector = tape->first_frame; 862 863 if (size) { 864 ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, 865 __GFP_WAIT); 866 if (ret) 867 goto out_put; 868 } 869 870 blk_execute_rq(drive->queue, tape->disk, rq, 0); 871 872 /* calculate the number of transferred bytes and update buffer state */ 873 size -= rq->resid_len; 874 tape->cur = tape->buf; 875 if (cmd == REQ_IDETAPE_READ) 876 tape->valid = size; 877 else 878 tape->valid = 0; 879 880 ret = size; 881 if (rq->errors == IDE_DRV_ERROR_GENERAL) 882 ret = -EIO; 883out_put: 884 blk_put_request(rq); 885 return ret; 886} 887 888static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 889{ 890 ide_init_pc(pc); 891 pc->c[0] = INQUIRY; 892 pc->c[4] = 254; 893 pc->req_xfer = 254; 894} 895 896static void idetape_create_rewind_cmd(ide_drive_t *drive, 897 struct ide_atapi_pc *pc) 898{ 899 ide_init_pc(pc); 900 pc->c[0] = REZERO_UNIT; 901 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 902} 903 904static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 905{ 906 ide_init_pc(pc); 907 pc->c[0] = ERASE; 908 pc->c[1] = 1; 909 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 910} 911 912static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 913{ 914 ide_init_pc(pc); 915 pc->c[0] = SPACE; 916 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 917 pc->c[1] = cmd; 918 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 919} 920 921static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 922{ 923 idetape_tape_t *tape = drive->driver_data; 924 925 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 926 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 927 " but we are not writing.\n"); 928 return; 929 } 930 if (tape->buf) { 931 size_t aligned = roundup(tape->valid, tape->blk_size); 932 933 memset(tape->cur, 0, aligned - tape->valid); 934 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); 935 kfree(tape->buf); 936 tape->buf = NULL; 937 } 938 tape->chrdev_dir = IDETAPE_DIR_NONE; 939} 940 941static int idetape_init_rw(ide_drive_t *drive, int dir) 942{ 943 idetape_tape_t *tape = drive->driver_data; 944 int rc; 945 946 BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); 947 948 if (tape->chrdev_dir == dir) 949 return 0; 950 951 if (tape->chrdev_dir == IDETAPE_DIR_READ) 952 ide_tape_discard_merge_buffer(drive, 1); 953 else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 954 ide_tape_flush_merge_buffer(drive); 955 idetape_flush_tape_buffers(drive); 956 } 957 958 if (tape->buf || tape->valid) { 959 printk(KERN_ERR "ide-tape: valid should be 0 now\n"); 960 tape->valid = 0; 961 } 962 963 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 964 if (!tape->buf) 965 return -ENOMEM; 966 tape->chrdev_dir = dir; 967 tape->cur = tape->buf; 968 969 /* 970 * Issue a 0 rw command to ensure that DSC handshake is 971 * switched from completion mode to buffer available mode. No 972 * point in issuing this if DSC overlap isn't supported, some 973 * drives (Seagate STT3401A) will return an error. 974 */ 975 if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { 976 int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ 977 : REQ_IDETAPE_WRITE; 978 979 rc = idetape_queue_rw_tail(drive, cmd, 0); 980 if (rc < 0) { 981 kfree(tape->buf); 982 tape->buf = NULL; 983 tape->chrdev_dir = IDETAPE_DIR_NONE; 984 return rc; 985 } 986 } 987 988 return 0; 989} 990 991static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 992{ 993 idetape_tape_t *tape = drive->driver_data; 994 995 memset(tape->buf, 0, tape->buffer_size); 996 997 while (bcount) { 998 unsigned int count = min(tape->buffer_size, bcount); 999 1000 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); 1001 bcount -= count; 1002 } 1003} 1004 1005/* 1006 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1007 * currently support only one partition. 1008 */ 1009static int idetape_rewind_tape(ide_drive_t *drive) 1010{ 1011 struct ide_tape_obj *tape = drive->driver_data; 1012 struct gendisk *disk = tape->disk; 1013 struct ide_atapi_pc pc; 1014 int ret; 1015 1016 ide_debug_log(IDE_DBG_FUNC, "enter"); 1017 1018 idetape_create_rewind_cmd(drive, &pc); 1019 ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1020 if (ret) 1021 return ret; 1022 1023 ret = ide_tape_read_position(drive); 1024 if (ret < 0) 1025 return ret; 1026 return 0; 1027} 1028 1029/* mtio.h compatible commands should be issued to the chrdev interface. */ 1030static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1031 unsigned long arg) 1032{ 1033 idetape_tape_t *tape = drive->driver_data; 1034 void __user *argp = (void __user *)arg; 1035 1036 struct idetape_config { 1037 int dsc_rw_frequency; 1038 int dsc_media_access_frequency; 1039 int nr_stages; 1040 } config; 1041 1042 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd); 1043 1044 switch (cmd) { 1045 case 0x0340: 1046 if (copy_from_user(&config, argp, sizeof(config))) 1047 return -EFAULT; 1048 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1049 break; 1050 case 0x0350: 1051 memset(&config, 0, sizeof(config)); 1052 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1053 config.nr_stages = 1; 1054 if (copy_to_user(argp, &config, sizeof(config))) 1055 return -EFAULT; 1056 break; 1057 default: 1058 return -EIO; 1059 } 1060 return 0; 1061} 1062 1063static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1064 int mt_count) 1065{ 1066 idetape_tape_t *tape = drive->driver_data; 1067 struct gendisk *disk = tape->disk; 1068 struct ide_atapi_pc pc; 1069 int retval, count = 0; 1070 int sprev = !!(tape->caps[4] & 0x20); 1071 1072 1073 ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count); 1074 1075 if (mt_count == 0) 1076 return 0; 1077 if (MTBSF == mt_op || MTBSFM == mt_op) { 1078 if (!sprev) 1079 return -EIO; 1080 mt_count = -mt_count; 1081 } 1082 1083 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1084 tape->valid = 0; 1085 if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), 1086 &drive->atapi_flags)) 1087 ++count; 1088 ide_tape_discard_merge_buffer(drive, 0); 1089 } 1090 1091 switch (mt_op) { 1092 case MTFSF: 1093 case MTBSF: 1094 idetape_create_space_cmd(&pc, mt_count - count, 1095 IDETAPE_SPACE_OVER_FILEMARK); 1096 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1097 case MTFSFM: 1098 case MTBSFM: 1099 if (!sprev) 1100 return -EIO; 1101 retval = idetape_space_over_filemarks(drive, MTFSF, 1102 mt_count - count); 1103 if (retval) 1104 return retval; 1105 count = (MTBSFM == mt_op ? 1 : -1); 1106 return idetape_space_over_filemarks(drive, MTFSF, count); 1107 default: 1108 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1109 mt_op); 1110 return -EIO; 1111 } 1112} 1113 1114/* 1115 * Our character device read / write functions. 1116 * 1117 * The tape is optimized to maximize throughput when it is transferring an 1118 * integral number of the "continuous transfer limit", which is a parameter of 1119 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1120 * 1121 * As of version 1.3 of the driver, the character device provides an abstract 1122 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1123 * same backup/restore procedure is supported. The driver will internally 1124 * convert the requests to the recommended transfer unit, so that an unmatch 1125 * between the user's block size to the recommended size will only result in a 1126 * (slightly) increased driver overhead, but will no longer hit performance. 1127 * This is not applicable to Onstream. 1128 */ 1129static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1130 size_t count, loff_t *ppos) 1131{ 1132 struct ide_tape_obj *tape = file->private_data; 1133 ide_drive_t *drive = tape->drive; 1134 size_t done = 0; 1135 ssize_t ret = 0; 1136 int rc; 1137 1138 ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); 1139 1140 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1141 if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) 1142 if (count > tape->blk_size && 1143 (count % tape->blk_size) == 0) 1144 tape->user_bs_factor = count / tape->blk_size; 1145 } 1146 1147 rc = idetape_init_rw(drive, IDETAPE_DIR_READ); 1148 if (rc < 0) 1149 return rc; 1150 1151 while (done < count) { 1152 size_t todo; 1153 1154 /* refill if staging buffer is empty */ 1155 if (!tape->valid) { 1156 /* If we are at a filemark, nothing more to read */ 1157 if (test_bit(ilog2(IDE_AFLAG_FILEMARK), 1158 &drive->atapi_flags)) 1159 break; 1160 /* read */ 1161 if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 1162 tape->buffer_size) <= 0) 1163 break; 1164 } 1165 1166 /* copy out */ 1167 todo = min_t(size_t, count - done, tape->valid); 1168 if (copy_to_user(buf + done, tape->cur, todo)) 1169 ret = -EFAULT; 1170 1171 tape->cur += todo; 1172 tape->valid -= todo; 1173 done += todo; 1174 } 1175 1176 if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { 1177 idetape_space_over_filemarks(drive, MTFSF, 1); 1178 return 0; 1179 } 1180 1181 return ret ? ret : done; 1182} 1183 1184static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1185 size_t count, loff_t *ppos) 1186{ 1187 struct ide_tape_obj *tape = file->private_data; 1188 ide_drive_t *drive = tape->drive; 1189 size_t done = 0; 1190 ssize_t ret = 0; 1191 int rc; 1192 1193 /* The drive is write protected. */ 1194 if (tape->write_prot) 1195 return -EACCES; 1196 1197 ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); 1198 1199 /* Initialize write operation */ 1200 rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); 1201 if (rc < 0) 1202 return rc; 1203 1204 while (done < count) { 1205 size_t todo; 1206 1207 /* flush if staging buffer is full */ 1208 if (tape->valid == tape->buffer_size && 1209 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1210 tape->buffer_size) <= 0) 1211 return rc; 1212 1213 /* copy in */ 1214 todo = min_t(size_t, count - done, 1215 tape->buffer_size - tape->valid); 1216 if (copy_from_user(tape->cur, buf + done, todo)) 1217 ret = -EFAULT; 1218 1219 tape->cur += todo; 1220 tape->valid += todo; 1221 done += todo; 1222 } 1223 1224 return ret ? ret : done; 1225} 1226 1227static int idetape_write_filemark(ide_drive_t *drive) 1228{ 1229 struct ide_tape_obj *tape = drive->driver_data; 1230 struct ide_atapi_pc pc; 1231 1232 /* Write a filemark */ 1233 idetape_create_write_filemark_cmd(drive, &pc, 1); 1234 if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { 1235 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1236 return -EIO; 1237 } 1238 return 0; 1239} 1240 1241/* 1242 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1243 * requested. 1244 * 1245 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1246 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1247 * usually not supported. 1248 * 1249 * The following commands are currently not supported: 1250 * 1251 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1252 * MT_ST_WRITE_THRESHOLD. 1253 */ 1254static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1255{ 1256 idetape_tape_t *tape = drive->driver_data; 1257 struct gendisk *disk = tape->disk; 1258 struct ide_atapi_pc pc; 1259 int i, retval; 1260 1261 ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d", 1262 mt_op, mt_count); 1263 1264 switch (mt_op) { 1265 case MTFSF: 1266 case MTFSFM: 1267 case MTBSF: 1268 case MTBSFM: 1269 if (!mt_count) 1270 return 0; 1271 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1272 default: 1273 break; 1274 } 1275 1276 switch (mt_op) { 1277 case MTWEOF: 1278 if (tape->write_prot) 1279 return -EACCES; 1280 ide_tape_discard_merge_buffer(drive, 1); 1281 for (i = 0; i < mt_count; i++) { 1282 retval = idetape_write_filemark(drive); 1283 if (retval) 1284 return retval; 1285 } 1286 return 0; 1287 case MTREW: 1288 ide_tape_discard_merge_buffer(drive, 0); 1289 if (idetape_rewind_tape(drive)) 1290 return -EIO; 1291 return 0; 1292 case MTLOAD: 1293 ide_tape_discard_merge_buffer(drive, 0); 1294 return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); 1295 case MTUNLOAD: 1296 case MTOFFL: 1297 /* 1298 * If door is locked, attempt to unlock before 1299 * attempting to eject. 1300 */ 1301 if (tape->door_locked) { 1302 if (!ide_set_media_lock(drive, disk, 0)) 1303 tape->door_locked = DOOR_UNLOCKED; 1304 } 1305 ide_tape_discard_merge_buffer(drive, 0); 1306 retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); 1307 if (!retval) 1308 clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), 1309 &drive->atapi_flags); 1310 return retval; 1311 case MTNOP: 1312 ide_tape_discard_merge_buffer(drive, 0); 1313 return idetape_flush_tape_buffers(drive); 1314 case MTRETEN: 1315 ide_tape_discard_merge_buffer(drive, 0); 1316 return ide_do_start_stop(drive, disk, 1317 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 1318 case MTEOM: 1319 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 1320 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1321 case MTERASE: 1322 (void)idetape_rewind_tape(drive); 1323 idetape_create_erase_cmd(&pc); 1324 return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); 1325 case MTSETBLK: 1326 if (mt_count) { 1327 if (mt_count < tape->blk_size || 1328 mt_count % tape->blk_size) 1329 return -EIO; 1330 tape->user_bs_factor = mt_count / tape->blk_size; 1331 clear_bit(ilog2(IDE_AFLAG_DETECT_BS), 1332 &drive->atapi_flags); 1333 } else 1334 set_bit(ilog2(IDE_AFLAG_DETECT_BS), 1335 &drive->atapi_flags); 1336 return 0; 1337 case MTSEEK: 1338 ide_tape_discard_merge_buffer(drive, 0); 1339 return idetape_position_tape(drive, 1340 mt_count * tape->user_bs_factor, tape->partition, 0); 1341 case MTSETPART: 1342 ide_tape_discard_merge_buffer(drive, 0); 1343 return idetape_position_tape(drive, 0, mt_count, 0); 1344 case MTFSR: 1345 case MTBSR: 1346 case MTLOCK: 1347 retval = ide_set_media_lock(drive, disk, 1); 1348 if (retval) 1349 return retval; 1350 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 1351 return 0; 1352 case MTUNLOCK: 1353 retval = ide_set_media_lock(drive, disk, 0); 1354 if (retval) 1355 return retval; 1356 tape->door_locked = DOOR_UNLOCKED; 1357 return 0; 1358 default: 1359 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1360 mt_op); 1361 return -EIO; 1362 } 1363} 1364 1365/* 1366 * Our character device ioctls. General mtio.h magnetic io commands are 1367 * supported here, and not in the corresponding block interface. Our own 1368 * ide-tape ioctls are supported on both interfaces. 1369 */ 1370static long do_idetape_chrdev_ioctl(struct file *file, 1371 unsigned int cmd, unsigned long arg) 1372{ 1373 struct ide_tape_obj *tape = file->private_data; 1374 ide_drive_t *drive = tape->drive; 1375 struct mtop mtop; 1376 struct mtget mtget; 1377 struct mtpos mtpos; 1378 int block_offset = 0, position = tape->first_frame; 1379 void __user *argp = (void __user *)arg; 1380 1381 ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd); 1382 1383 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1384 ide_tape_flush_merge_buffer(drive); 1385 idetape_flush_tape_buffers(drive); 1386 } 1387 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 1388 block_offset = tape->valid / 1389 (tape->blk_size * tape->user_bs_factor); 1390 position = ide_tape_read_position(drive); 1391 if (position < 0) 1392 return -EIO; 1393 } 1394 switch (cmd) { 1395 case MTIOCTOP: 1396 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 1397 return -EFAULT; 1398 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 1399 case MTIOCGET: 1400 memset(&mtget, 0, sizeof(struct mtget)); 1401 mtget.mt_type = MT_ISSCSI2; 1402 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 1403 mtget.mt_dsreg = 1404 ((tape->blk_size * tape->user_bs_factor) 1405 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 1406 1407 if (tape->drv_write_prot) 1408 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 1409 1410 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 1411 return -EFAULT; 1412 return 0; 1413 case MTIOCPOS: 1414 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 1415 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 1416 return -EFAULT; 1417 return 0; 1418 default: 1419 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1420 ide_tape_discard_merge_buffer(drive, 1); 1421 return idetape_blkdev_ioctl(drive, cmd, arg); 1422 } 1423} 1424 1425static long idetape_chrdev_ioctl(struct file *file, 1426 unsigned int cmd, unsigned long arg) 1427{ 1428 long ret; 1429 lock_kernel(); 1430 ret = do_idetape_chrdev_ioctl(file, cmd, arg); 1431 unlock_kernel(); 1432 return ret; 1433} 1434 1435/* 1436 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 1437 * block size with the reported value. 1438 */ 1439static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 1440{ 1441 idetape_tape_t *tape = drive->driver_data; 1442 struct ide_atapi_pc pc; 1443 u8 buf[12]; 1444 1445 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 1446 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1447 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 1448 if (tape->blk_size == 0) { 1449 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 1450 "block size, assuming 32k\n"); 1451 tape->blk_size = 32768; 1452 } 1453 return; 1454 } 1455 tape->blk_size = (buf[4 + 5] << 16) + 1456 (buf[4 + 6] << 8) + 1457 buf[4 + 7]; 1458 tape->drv_write_prot = (buf[2] & 0x80) >> 7; 1459 1460 ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d", 1461 tape->blk_size, tape->drv_write_prot); 1462} 1463 1464static int idetape_chrdev_open(struct inode *inode, struct file *filp) 1465{ 1466 unsigned int minor = iminor(inode), i = minor & ~0xc0; 1467 ide_drive_t *drive; 1468 idetape_tape_t *tape; 1469 int retval; 1470 1471 if (i >= MAX_HWIFS * MAX_DRIVES) 1472 return -ENXIO; 1473 1474 mutex_lock(&idetape_chrdev_mutex); 1475 1476 tape = ide_tape_get(NULL, true, i); 1477 if (!tape) { 1478 mutex_unlock(&idetape_chrdev_mutex); 1479 return -ENXIO; 1480 } 1481 1482 drive = tape->drive; 1483 filp->private_data = tape; 1484 1485 ide_debug_log(IDE_DBG_FUNC, "enter"); 1486 1487 /* 1488 * We really want to do nonseekable_open(inode, filp); here, but some 1489 * versions of tar incorrectly call lseek on tapes and bail out if that 1490 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1491 */ 1492 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1493 1494 1495 if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { 1496 retval = -EBUSY; 1497 goto out_put_tape; 1498 } 1499 1500 retval = idetape_wait_ready(drive, 60 * HZ); 1501 if (retval) { 1502 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); 1503 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 1504 goto out_put_tape; 1505 } 1506 1507 ide_tape_read_position(drive); 1508 if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) 1509 (void)idetape_rewind_tape(drive); 1510 1511 /* Read block size and write protect status from drive. */ 1512 ide_tape_get_bsize_from_bdesc(drive); 1513 1514 /* Set write protect flag if device is opened as read-only. */ 1515 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 1516 tape->write_prot = 1; 1517 else 1518 tape->write_prot = tape->drv_write_prot; 1519 1520 /* Make sure drive isn't write protected if user wants to write. */ 1521 if (tape->write_prot) { 1522 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 1523 (filp->f_flags & O_ACCMODE) == O_RDWR) { 1524 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); 1525 retval = -EROFS; 1526 goto out_put_tape; 1527 } 1528 } 1529 1530 /* Lock the tape drive door so user can't eject. */ 1531 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1532 if (!ide_set_media_lock(drive, tape->disk, 1)) { 1533 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 1534 tape->door_locked = DOOR_LOCKED; 1535 } 1536 } 1537 mutex_unlock(&idetape_chrdev_mutex); 1538 1539 return 0; 1540 1541out_put_tape: 1542 ide_tape_put(tape); 1543 1544 mutex_unlock(&idetape_chrdev_mutex); 1545 1546 return retval; 1547} 1548 1549static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 1550{ 1551 idetape_tape_t *tape = drive->driver_data; 1552 1553 ide_tape_flush_merge_buffer(drive); 1554 tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); 1555 if (tape->buf != NULL) { 1556 idetape_pad_zeros(drive, tape->blk_size * 1557 (tape->user_bs_factor - 1)); 1558 kfree(tape->buf); 1559 tape->buf = NULL; 1560 } 1561 idetape_write_filemark(drive); 1562 idetape_flush_tape_buffers(drive); 1563 idetape_flush_tape_buffers(drive); 1564} 1565 1566static int idetape_chrdev_release(struct inode *inode, struct file *filp) 1567{ 1568 struct ide_tape_obj *tape = filp->private_data; 1569 ide_drive_t *drive = tape->drive; 1570 unsigned int minor = iminor(inode); 1571 1572 mutex_lock(&idetape_chrdev_mutex); 1573 1574 tape = drive->driver_data; 1575 1576 ide_debug_log(IDE_DBG_FUNC, "enter"); 1577 1578 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1579 idetape_write_release(drive, minor); 1580 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1581 if (minor < 128) 1582 ide_tape_discard_merge_buffer(drive, 1); 1583 } 1584 1585 if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), 1586 &drive->atapi_flags)) 1587 (void) idetape_rewind_tape(drive); 1588 1589 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 1590 if (tape->door_locked == DOOR_LOCKED) { 1591 if (!ide_set_media_lock(drive, tape->disk, 0)) 1592 tape->door_locked = DOOR_UNLOCKED; 1593 } 1594 } 1595 clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); 1596 ide_tape_put(tape); 1597 1598 mutex_unlock(&idetape_chrdev_mutex); 1599 1600 return 0; 1601} 1602 1603static void idetape_get_inquiry_results(ide_drive_t *drive) 1604{ 1605 idetape_tape_t *tape = drive->driver_data; 1606 struct ide_atapi_pc pc; 1607 u8 pc_buf[256]; 1608 char fw_rev[4], vendor_id[8], product_id[16]; 1609 1610 idetape_create_inquiry_cmd(&pc); 1611 if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { 1612 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 1613 tape->name); 1614 return; 1615 } 1616 memcpy(vendor_id, &pc_buf[8], 8); 1617 memcpy(product_id, &pc_buf[16], 16); 1618 memcpy(fw_rev, &pc_buf[32], 4); 1619 1620 ide_fixstring(vendor_id, 8, 0); 1621 ide_fixstring(product_id, 16, 0); 1622 ide_fixstring(fw_rev, 4, 0); 1623 1624 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", 1625 drive->name, tape->name, vendor_id, product_id, fw_rev); 1626} 1627 1628/* 1629 * Ask the tape about its various parameters. In particular, we will adjust our 1630 * data transfer buffer size to the recommended value as returned by the tape. 1631 */ 1632static void idetape_get_mode_sense_results(ide_drive_t *drive) 1633{ 1634 idetape_tape_t *tape = drive->driver_data; 1635 struct ide_atapi_pc pc; 1636 u8 buf[24], *caps; 1637 u8 speed, max_speed; 1638 1639 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 1640 if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { 1641 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 1642 " some default values\n"); 1643 tape->blk_size = 512; 1644 put_unaligned(52, (u16 *)&tape->caps[12]); 1645 put_unaligned(540, (u16 *)&tape->caps[14]); 1646 put_unaligned(6*52, (u16 *)&tape->caps[16]); 1647 return; 1648 } 1649 caps = buf + 4 + buf[3]; 1650 1651 /* convert to host order and save for later use */ 1652 speed = be16_to_cpup((__be16 *)&caps[14]); 1653 max_speed = be16_to_cpup((__be16 *)&caps[8]); 1654 1655 *(u16 *)&caps[8] = max_speed; 1656 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); 1657 *(u16 *)&caps[14] = speed; 1658 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); 1659 1660 if (!speed) { 1661 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 1662 "(assuming 650KB/sec)\n", drive->name); 1663 *(u16 *)&caps[14] = 650; 1664 } 1665 if (!max_speed) { 1666 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 1667 "(assuming 650KB/sec)\n", drive->name); 1668 *(u16 *)&caps[8] = 650; 1669 } 1670 1671 memcpy(&tape->caps, caps, 20); 1672 1673 /* device lacks locking support according to capabilities page */ 1674 if ((caps[6] & 1) == 0) 1675 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; 1676 1677 if (caps[7] & 0x02) 1678 tape->blk_size = 512; 1679 else if (caps[7] & 0x04) 1680 tape->blk_size = 1024; 1681} 1682 1683#ifdef CONFIG_IDE_PROC_FS 1684#define ide_tape_devset_get(name, field) \ 1685static int get_##name(ide_drive_t *drive) \ 1686{ \ 1687 idetape_tape_t *tape = drive->driver_data; \ 1688 return tape->field; \ 1689} 1690 1691#define ide_tape_devset_set(name, field) \ 1692static int set_##name(ide_drive_t *drive, int arg) \ 1693{ \ 1694 idetape_tape_t *tape = drive->driver_data; \ 1695 tape->field = arg; \ 1696 return 0; \ 1697} 1698 1699#define ide_tape_devset_rw_field(_name, _field) \ 1700ide_tape_devset_get(_name, _field) \ 1701ide_tape_devset_set(_name, _field) \ 1702IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) 1703 1704#define ide_tape_devset_r_field(_name, _field) \ 1705ide_tape_devset_get(_name, _field) \ 1706IDE_DEVSET(_name, 0, get_##_name, NULL) 1707 1708static int mulf_tdsc(ide_drive_t *drive) { return 1000; } 1709static int divf_tdsc(ide_drive_t *drive) { return HZ; } 1710static int divf_buffer(ide_drive_t *drive) { return 2; } 1711static int divf_buffer_size(ide_drive_t *drive) { return 1024; } 1712 1713ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); 1714 1715ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); 1716 1717ide_tape_devset_r_field(avg_speed, avg_speed); 1718ide_tape_devset_r_field(speed, caps[14]); 1719ide_tape_devset_r_field(buffer, caps[16]); 1720ide_tape_devset_r_field(buffer_size, buffer_size); 1721 1722static const struct ide_proc_devset idetape_settings[] = { 1723 __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), 1724 __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), 1725 __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), 1726 __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), 1727 __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), 1728 __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1729 mulf_tdsc, divf_tdsc), 1730 { NULL }, 1731}; 1732#endif 1733 1734/* 1735 * The function below is called to: 1736 * 1737 * 1. Initialize our various state variables. 1738 * 2. Ask the tape for its capabilities. 1739 * 3. Allocate a buffer which will be used for data transfer. The buffer size 1740 * is chosen based on the recommendation which we received in step 2. 1741 * 1742 * Note that at this point ide.c already assigned us an irq, so that we can 1743 * queue requests here and wait for their completion. 1744 */ 1745static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 1746{ 1747 unsigned long t; 1748 int speed; 1749 int buffer_size; 1750 u16 *ctl = (u16 *)&tape->caps[12]; 1751 1752 ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor); 1753 1754 drive->pc_callback = ide_tape_callback; 1755 1756 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 1757 1758 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 1759 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 1760 tape->name); 1761 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1762 } 1763 1764 /* Seagate Travan drives do not support DSC overlap. */ 1765 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) 1766 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1767 1768 tape->minor = minor; 1769 tape->name[0] = 'h'; 1770 tape->name[1] = 't'; 1771 tape->name[2] = '0' + minor; 1772 tape->chrdev_dir = IDETAPE_DIR_NONE; 1773 1774 idetape_get_inquiry_results(drive); 1775 idetape_get_mode_sense_results(drive); 1776 ide_tape_get_bsize_from_bdesc(drive); 1777 tape->user_bs_factor = 1; 1778 tape->buffer_size = *ctl * tape->blk_size; 1779 while (tape->buffer_size > 0xffff) { 1780 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 1781 *ctl /= 2; 1782 tape->buffer_size = *ctl * tape->blk_size; 1783 } 1784 buffer_size = tape->buffer_size; 1785 1786 /* select the "best" DSC read/write polling freq */ 1787 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 1788 1789 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 1790 1791 /* 1792 * Ensure that the number we got makes sense; limit it within 1793 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 1794 */ 1795 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 1796 IDETAPE_DSC_RW_MAX); 1797 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 1798 "%lums tDSC%s\n", 1799 drive->name, tape->name, *(u16 *)&tape->caps[14], 1800 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 1801 tape->buffer_size / 1024, 1802 tape->best_dsc_rw_freq * 1000 / HZ, 1803 (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); 1804 1805 ide_proc_register_driver(drive, tape->driver); 1806} 1807 1808static void ide_tape_remove(ide_drive_t *drive) 1809{ 1810 idetape_tape_t *tape = drive->driver_data; 1811 1812 ide_proc_unregister_driver(drive, tape->driver); 1813 device_del(&tape->dev); 1814 ide_unregister_region(tape->disk); 1815 1816 mutex_lock(&idetape_ref_mutex); 1817 put_device(&tape->dev); 1818 mutex_unlock(&idetape_ref_mutex); 1819} 1820 1821static void ide_tape_release(struct device *dev) 1822{ 1823 struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); 1824 ide_drive_t *drive = tape->drive; 1825 struct gendisk *g = tape->disk; 1826 1827 BUG_ON(tape->valid); 1828 1829 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 1830 drive->driver_data = NULL; 1831 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 1832 device_destroy(idetape_sysfs_class, 1833 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 1834 idetape_devs[tape->minor] = NULL; 1835 g->private_data = NULL; 1836 put_disk(g); 1837 kfree(tape); 1838} 1839 1840#ifdef CONFIG_IDE_PROC_FS 1841static int idetape_name_proc_show(struct seq_file *m, void *v) 1842{ 1843 ide_drive_t *drive = (ide_drive_t *) m->private; 1844 idetape_tape_t *tape = drive->driver_data; 1845 1846 seq_printf(m, "%s\n", tape->name); 1847 return 0; 1848} 1849 1850static int idetape_name_proc_open(struct inode *inode, struct file *file) 1851{ 1852 return single_open(file, idetape_name_proc_show, PDE(inode)->data); 1853} 1854 1855static const struct file_operations idetape_name_proc_fops = { 1856 .owner = THIS_MODULE, 1857 .open = idetape_name_proc_open, 1858 .read = seq_read, 1859 .llseek = seq_lseek, 1860 .release = single_release, 1861}; 1862 1863static ide_proc_entry_t idetape_proc[] = { 1864 { "capacity", S_IFREG|S_IRUGO, &ide_capacity_proc_fops }, 1865 { "name", S_IFREG|S_IRUGO, &idetape_name_proc_fops }, 1866 {} 1867}; 1868 1869static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) 1870{ 1871 return idetape_proc; 1872} 1873 1874static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) 1875{ 1876 return idetape_settings; 1877} 1878#endif 1879 1880static int ide_tape_probe(ide_drive_t *); 1881 1882static struct ide_driver idetape_driver = { 1883 .gen_driver = { 1884 .owner = THIS_MODULE, 1885 .name = "ide-tape", 1886 .bus = &ide_bus_type, 1887 }, 1888 .probe = ide_tape_probe, 1889 .remove = ide_tape_remove, 1890 .version = IDETAPE_VERSION, 1891 .do_request = idetape_do_request, 1892#ifdef CONFIG_IDE_PROC_FS 1893 .proc_entries = ide_tape_proc_entries, 1894 .proc_devsets = ide_tape_proc_devsets, 1895#endif 1896}; 1897 1898/* Our character device supporting functions, passed to register_chrdev. */ 1899static const struct file_operations idetape_fops = { 1900 .owner = THIS_MODULE, 1901 .read = idetape_chrdev_read, 1902 .write = idetape_chrdev_write, 1903 .unlocked_ioctl = idetape_chrdev_ioctl, 1904 .open = idetape_chrdev_open, 1905 .release = idetape_chrdev_release, 1906}; 1907 1908static int idetape_open(struct block_device *bdev, fmode_t mode) 1909{ 1910 struct ide_tape_obj *tape; 1911 1912 lock_kernel(); 1913 tape = ide_tape_get(bdev->bd_disk, false, 0); 1914 unlock_kernel(); 1915 1916 if (!tape) 1917 return -ENXIO; 1918 1919 return 0; 1920} 1921 1922static int idetape_release(struct gendisk *disk, fmode_t mode) 1923{ 1924 struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); 1925 1926 lock_kernel(); 1927 ide_tape_put(tape); 1928 unlock_kernel(); 1929 1930 return 0; 1931} 1932 1933static int idetape_ioctl(struct block_device *bdev, fmode_t mode, 1934 unsigned int cmd, unsigned long arg) 1935{ 1936 struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); 1937 ide_drive_t *drive = tape->drive; 1938 int err; 1939 1940 lock_kernel(); 1941 err = generic_ide_ioctl(drive, bdev, cmd, arg); 1942 if (err == -EINVAL) 1943 err = idetape_blkdev_ioctl(drive, cmd, arg); 1944 unlock_kernel(); 1945 1946 return err; 1947} 1948 1949static const struct block_device_operations idetape_block_ops = { 1950 .owner = THIS_MODULE, 1951 .open = idetape_open, 1952 .release = idetape_release, 1953 .ioctl = idetape_ioctl, 1954}; 1955 1956static int ide_tape_probe(ide_drive_t *drive) 1957{ 1958 idetape_tape_t *tape; 1959 struct gendisk *g; 1960 int minor; 1961 1962 ide_debug_log(IDE_DBG_FUNC, "enter"); 1963 1964 if (!strstr(DRV_NAME, drive->driver_req)) 1965 goto failed; 1966 1967 if (drive->media != ide_tape) 1968 goto failed; 1969 1970 if ((drive->dev_flags & IDE_DFLAG_ID_READ) && 1971 ide_check_atapi_device(drive, DRV_NAME) == 0) { 1972 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 1973 " the driver\n", drive->name); 1974 goto failed; 1975 } 1976 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 1977 if (tape == NULL) { 1978 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 1979 drive->name); 1980 goto failed; 1981 } 1982 1983 g = alloc_disk(1 << PARTN_BITS); 1984 if (!g) 1985 goto out_free_tape; 1986 1987 ide_init_disk(g, drive); 1988 1989 tape->dev.parent = &drive->gendev; 1990 tape->dev.release = ide_tape_release; 1991 dev_set_name(&tape->dev, dev_name(&drive->gendev)); 1992 1993 if (device_register(&tape->dev)) 1994 goto out_free_disk; 1995 1996 tape->drive = drive; 1997 tape->driver = &idetape_driver; 1998 tape->disk = g; 1999 2000 g->private_data = &tape->driver; 2001 2002 drive->driver_data = tape; 2003 2004 mutex_lock(&idetape_ref_mutex); 2005 for (minor = 0; idetape_devs[minor]; minor++) 2006 ; 2007 idetape_devs[minor] = tape; 2008 mutex_unlock(&idetape_ref_mutex); 2009 2010 idetape_setup(drive, tape, minor); 2011 2012 device_create(idetape_sysfs_class, &drive->gendev, 2013 MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); 2014 device_create(idetape_sysfs_class, &drive->gendev, 2015 MKDEV(IDETAPE_MAJOR, minor + 128), NULL, 2016 "n%s", tape->name); 2017 2018 g->fops = &idetape_block_ops; 2019 ide_register_region(g); 2020 2021 return 0; 2022 2023out_free_disk: 2024 put_disk(g); 2025out_free_tape: 2026 kfree(tape); 2027failed: 2028 return -ENODEV; 2029} 2030 2031static void __exit idetape_exit(void) 2032{ 2033 driver_unregister(&idetape_driver.gen_driver); 2034 class_destroy(idetape_sysfs_class); 2035 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2036} 2037 2038static int __init idetape_init(void) 2039{ 2040 int error = 1; 2041 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2042 if (IS_ERR(idetape_sysfs_class)) { 2043 idetape_sysfs_class = NULL; 2044 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2045 error = -EBUSY; 2046 goto out; 2047 } 2048 2049 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2050 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2051 " interface\n"); 2052 error = -EBUSY; 2053 goto out_free_class; 2054 } 2055 2056 error = driver_register(&idetape_driver.gen_driver); 2057 if (error) 2058 goto out_free_driver; 2059 2060 return 0; 2061 2062out_free_driver: 2063 driver_unregister(&idetape_driver.gen_driver); 2064out_free_class: 2065 class_destroy(idetape_sysfs_class); 2066out: 2067 return error; 2068} 2069 2070MODULE_ALIAS("ide:*m-tape*"); 2071module_init(idetape_init); 2072module_exit(idetape_exit); 2073MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2074MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2075MODULE_LICENSE("GPL"); 2076