ide-tape.c revision cd2abbfec84f43db740483daf4ea528d49d8858f
1/* 2 * IDE ATAPI streaming tape driver. 3 * 4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> 5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz 6 * 7 * This driver was constructed as a student project in the software laboratory 8 * of the faculty of electrical engineering in the Technion - Israel's 9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. 10 * 11 * It is hereby placed under the terms of the GNU general public license. 12 * (See linux/COPYING). 13 * 14 * For a historical changelog see 15 * Documentation/ide/ChangeLog.ide-tape.1995-2002 16 */ 17 18#define IDETAPE_VERSION "1.20" 19 20#include <linux/module.h> 21#include <linux/types.h> 22#include <linux/string.h> 23#include <linux/kernel.h> 24#include <linux/delay.h> 25#include <linux/timer.h> 26#include <linux/mm.h> 27#include <linux/interrupt.h> 28#include <linux/jiffies.h> 29#include <linux/major.h> 30#include <linux/errno.h> 31#include <linux/genhd.h> 32#include <linux/slab.h> 33#include <linux/pci.h> 34#include <linux/ide.h> 35#include <linux/smp_lock.h> 36#include <linux/completion.h> 37#include <linux/bitops.h> 38#include <linux/mutex.h> 39#include <scsi/scsi.h> 40 41#include <asm/byteorder.h> 42#include <linux/irq.h> 43#include <linux/uaccess.h> 44#include <linux/io.h> 45#include <asm/unaligned.h> 46#include <linux/mtio.h> 47 48enum { 49 /* output errors only */ 50 DBG_ERR = (1 << 0), 51 /* output all sense key/asc */ 52 DBG_SENSE = (1 << 1), 53 /* info regarding all chrdev-related procedures */ 54 DBG_CHRDEV = (1 << 2), 55 /* all remaining procedures */ 56 DBG_PROCS = (1 << 3), 57 /* buffer alloc info (pc_stack & rq_stack) */ 58 DBG_PCRQ_STACK = (1 << 4), 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 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE 85 * bytes. This is used for several packet commands (Not for READ/WRITE commands) 86 */ 87#define IDETAPE_PC_BUFFER_SIZE 256 88 89/* 90 * In various places in the driver, we need to allocate storage 91 * for packet commands and requests, which will remain valid while 92 * we leave the driver to wait for an interrupt or a timeout event. 93 */ 94#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) 95 96/* 97 * Some drives (for example, Seagate STT3401A Travan) require a very long 98 * timeout, because they don't return an interrupt or clear their busy bit 99 * until after the command completes (even retension commands). 100 */ 101#define IDETAPE_WAIT_CMD (900*HZ) 102 103/* 104 * The following parameter is used to select the point in the internal tape fifo 105 * in which we will start to refill the buffer. Decreasing the following 106 * parameter will improve the system's latency and interactive response, while 107 * using a high value might improve system throughput. 108 */ 109#define IDETAPE_FIFO_THRESHOLD 2 110 111/* 112 * DSC polling parameters. 113 * 114 * Polling for DSC (a single bit in the status register) is a very important 115 * function in ide-tape. There are two cases in which we poll for DSC: 116 * 117 * 1. Before a read/write packet command, to ensure that we can transfer data 118 * from/to the tape's data buffers, without causing an actual media access. 119 * In case the tape is not ready yet, we take out our request from the device 120 * request queue, so that ide.c could service requests from the other device 121 * on the same interface in the meantime. 122 * 123 * 2. After the successful initialization of a "media access packet command", 124 * which is a command that can take a long time to complete (the interval can 125 * range from several seconds to even an hour). Again, we postpone our request 126 * in the middle to free the bus for the other device. The polling frequency 127 * here should be lower than the read/write frequency since those media access 128 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST 129 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD 130 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). 131 * 132 * We also set a timeout for the timer, in case something goes wrong. The 133 * timeout should be longer then the maximum execution time of a tape operation. 134 */ 135 136/* DSC timings. */ 137#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 138#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 139#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 140#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 141#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 142#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 143#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 144 145/*************************** End of tunable parameters ***********************/ 146 147/* tape directions */ 148enum { 149 IDETAPE_DIR_NONE = (1 << 0), 150 IDETAPE_DIR_READ = (1 << 1), 151 IDETAPE_DIR_WRITE = (1 << 2), 152}; 153 154struct idetape_bh { 155 u32 b_size; 156 atomic_t b_count; 157 struct idetape_bh *b_reqnext; 158 char *b_data; 159}; 160 161/* Tape door status */ 162#define DOOR_UNLOCKED 0 163#define DOOR_LOCKED 1 164#define DOOR_EXPLICITLY_LOCKED 2 165 166/* Some defines for the SPACE command */ 167#define IDETAPE_SPACE_OVER_FILEMARK 1 168#define IDETAPE_SPACE_TO_EOD 3 169 170/* Some defines for the LOAD UNLOAD command */ 171#define IDETAPE_LU_LOAD_MASK 1 172#define IDETAPE_LU_RETENSION_MASK 2 173#define IDETAPE_LU_EOT_MASK 4 174 175/* 176 * Special requests for our block device strategy routine. 177 * 178 * In order to service a character device command, we add special requests to 179 * the tail of our block device request queue and wait for their completion. 180 */ 181 182enum { 183 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ 184 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ 185 REQ_IDETAPE_READ = (1 << 2), 186 REQ_IDETAPE_WRITE = (1 << 3), 187}; 188 189/* Error codes returned in rq->errors to the higher part of the driver. */ 190#define IDETAPE_ERROR_GENERAL 101 191#define IDETAPE_ERROR_FILEMARK 102 192#define IDETAPE_ERROR_EOD 103 193 194/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ 195#define IDETAPE_BLOCK_DESCRIPTOR 0 196#define IDETAPE_CAPABILITIES_PAGE 0x2a 197 198/* Tape flag bits values. */ 199enum { 200 IDETAPE_FLAG_IGNORE_DSC = (1 << 0), 201 /* 0 When the tape position is unknown */ 202 IDETAPE_FLAG_ADDRESS_VALID = (1 << 1), 203 /* Device already opened */ 204 IDETAPE_FLAG_BUSY = (1 << 2), 205 /* Attempt to auto-detect the current user block size */ 206 IDETAPE_FLAG_DETECT_BS = (1 << 3), 207 /* Currently on a filemark */ 208 IDETAPE_FLAG_FILEMARK = (1 << 4), 209 /* DRQ interrupt device */ 210 IDETAPE_FLAG_DRQ_INTERRUPT = (1 << 5), 211 /* 0 = no tape is loaded, so we don't rewind after ejecting */ 212 IDETAPE_FLAG_MEDIUM_PRESENT = (1 << 6), 213}; 214 215/* 216 * Most of our global data which we need to save even as we leave the driver due 217 * to an interrupt or a timer event is stored in the struct defined below. 218 */ 219typedef struct ide_tape_obj { 220 ide_drive_t *drive; 221 ide_driver_t *driver; 222 struct gendisk *disk; 223 struct kref kref; 224 225 /* 226 * Since a typical character device operation requires more 227 * than one packet command, we provide here enough memory 228 * for the maximum of interconnected packet commands. 229 * The packet commands are stored in the circular array pc_stack. 230 * pc_stack_index points to the last used entry, and warps around 231 * to the start when we get to the last array entry. 232 * 233 * pc points to the current processed packet command. 234 * 235 * failed_pc points to the last failed packet command, or contains 236 * NULL if we do not need to retry any packet command. This is 237 * required since an additional packet command is needed before the 238 * retry, to get detailed information on what went wrong. 239 */ 240 /* Current packet command */ 241 struct ide_atapi_pc *pc; 242 /* Last failed packet command */ 243 struct ide_atapi_pc *failed_pc; 244 /* Packet command stack */ 245 struct ide_atapi_pc pc_stack[IDETAPE_PC_STACK]; 246 /* Next free packet command storage space */ 247 int pc_stack_index; 248 struct request rq_stack[IDETAPE_PC_STACK]; 249 /* We implement a circular array */ 250 int rq_stack_index; 251 252 /* 253 * DSC polling variables. 254 * 255 * While polling for DSC we use postponed_rq to postpone the current 256 * request so that ide.c will be able to service pending requests on the 257 * other device. Note that at most we will have only one DSC (usually 258 * data transfer) request in the device request queue. 259 */ 260 struct request *postponed_rq; 261 /* The time in which we started polling for DSC */ 262 unsigned long dsc_polling_start; 263 /* Timer used to poll for dsc */ 264 struct timer_list dsc_timer; 265 /* Read/Write dsc polling frequency */ 266 unsigned long best_dsc_rw_freq; 267 unsigned long dsc_poll_freq; 268 unsigned long dsc_timeout; 269 270 /* Read position information */ 271 u8 partition; 272 /* Current block */ 273 unsigned int first_frame; 274 275 /* Last error information */ 276 u8 sense_key, asc, ascq; 277 278 /* Character device operation */ 279 unsigned int minor; 280 /* device name */ 281 char name[4]; 282 /* Current character device data transfer direction */ 283 u8 chrdev_dir; 284 285 /* tape block size, usually 512 or 1024 bytes */ 286 unsigned short blk_size; 287 int user_bs_factor; 288 289 /* Copy of the tape's Capabilities and Mechanical Page */ 290 u8 caps[20]; 291 292 /* 293 * Active data transfer request parameters. 294 * 295 * At most, there is only one ide-tape originated data transfer request 296 * in the device request queue. This allows ide.c to easily service 297 * requests from the other device when we postpone our active request. 298 */ 299 300 /* Data buffer size chosen based on the tape's recommendation */ 301 int buffer_size; 302 /* merge buffer */ 303 struct idetape_bh *merge_bh; 304 /* size of the merge buffer */ 305 int merge_bh_size; 306 /* pointer to current buffer head within the merge buffer */ 307 struct idetape_bh *bh; 308 char *b_data; 309 int b_count; 310 311 int pages_per_buffer; 312 /* Wasted space in each stage */ 313 int excess_bh_size; 314 315 /* Status/Action flags: long for set_bit */ 316 unsigned long flags; 317 /* protects the ide-tape queue */ 318 spinlock_t lock; 319 320 /* Measures average tape speed */ 321 unsigned long avg_time; 322 int avg_size; 323 int avg_speed; 324 325 /* the door is currently locked */ 326 int door_locked; 327 /* the tape hardware is write protected */ 328 char drv_write_prot; 329 /* the tape is write protected (hardware or opened as read-only) */ 330 char write_prot; 331 332 u32 debug_mask; 333} idetape_tape_t; 334 335static DEFINE_MUTEX(idetape_ref_mutex); 336 337static struct class *idetape_sysfs_class; 338 339#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) 340 341#define ide_tape_g(disk) \ 342 container_of((disk)->private_data, struct ide_tape_obj, driver) 343 344static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 345{ 346 struct ide_tape_obj *tape = NULL; 347 348 mutex_lock(&idetape_ref_mutex); 349 tape = ide_tape_g(disk); 350 if (tape) 351 kref_get(&tape->kref); 352 mutex_unlock(&idetape_ref_mutex); 353 return tape; 354} 355 356static void ide_tape_release(struct kref *); 357 358static void ide_tape_put(struct ide_tape_obj *tape) 359{ 360 mutex_lock(&idetape_ref_mutex); 361 kref_put(&tape->kref, ide_tape_release); 362 mutex_unlock(&idetape_ref_mutex); 363} 364 365/* 366 * The variables below are used for the character device interface. Additional 367 * state variables are defined in our ide_drive_t structure. 368 */ 369static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; 370 371#define ide_tape_f(file) ((file)->private_data) 372 373static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 374{ 375 struct ide_tape_obj *tape = NULL; 376 377 mutex_lock(&idetape_ref_mutex); 378 tape = idetape_devs[i]; 379 if (tape) 380 kref_get(&tape->kref); 381 mutex_unlock(&idetape_ref_mutex); 382 return tape; 383} 384 385static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, 386 unsigned int bcount) 387{ 388 struct idetape_bh *bh = pc->bh; 389 int count; 390 391 while (bcount) { 392 if (bh == NULL) { 393 printk(KERN_ERR "ide-tape: bh == NULL in " 394 "idetape_input_buffers\n"); 395 ide_pad_transfer(drive, 0, bcount); 396 return; 397 } 398 count = min( 399 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), 400 bcount); 401 drive->hwif->input_data(drive, NULL, bh->b_data + 402 atomic_read(&bh->b_count), count); 403 bcount -= count; 404 atomic_add(count, &bh->b_count); 405 if (atomic_read(&bh->b_count) == bh->b_size) { 406 bh = bh->b_reqnext; 407 if (bh) 408 atomic_set(&bh->b_count, 0); 409 } 410 } 411 pc->bh = bh; 412} 413 414static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, 415 unsigned int bcount) 416{ 417 struct idetape_bh *bh = pc->bh; 418 int count; 419 420 while (bcount) { 421 if (bh == NULL) { 422 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 423 __func__); 424 return; 425 } 426 count = min((unsigned int)pc->b_count, (unsigned int)bcount); 427 drive->hwif->output_data(drive, NULL, pc->b_data, count); 428 bcount -= count; 429 pc->b_data += count; 430 pc->b_count -= count; 431 if (!pc->b_count) { 432 bh = bh->b_reqnext; 433 pc->bh = bh; 434 if (bh) { 435 pc->b_data = bh->b_data; 436 pc->b_count = atomic_read(&bh->b_count); 437 } 438 } 439 } 440} 441 442static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) 443{ 444 struct idetape_bh *bh = pc->bh; 445 int count; 446 unsigned int bcount = pc->xferred; 447 448 if (pc->flags & PC_FLAG_WRITING) 449 return; 450 while (bcount) { 451 if (bh == NULL) { 452 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 453 __func__); 454 return; 455 } 456 count = min((unsigned int)bh->b_size, (unsigned int)bcount); 457 atomic_set(&bh->b_count, count); 458 if (atomic_read(&bh->b_count) == bh->b_size) 459 bh = bh->b_reqnext; 460 bcount -= count; 461 } 462 pc->bh = bh; 463} 464 465/* 466 * idetape_next_pc_storage returns a pointer to a place in which we can 467 * safely store a packet command, even though we intend to leave the 468 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet 469 * commands is allocated at initialization time. 470 */ 471static struct ide_atapi_pc *idetape_next_pc_storage(ide_drive_t *drive) 472{ 473 idetape_tape_t *tape = drive->driver_data; 474 475 debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index); 476 477 if (tape->pc_stack_index == IDETAPE_PC_STACK) 478 tape->pc_stack_index = 0; 479 return (&tape->pc_stack[tape->pc_stack_index++]); 480} 481 482/* 483 * idetape_next_rq_storage is used along with idetape_next_pc_storage. 484 * Since we queue packet commands in the request queue, we need to 485 * allocate a request, along with the allocation of a packet command. 486 */ 487 488/************************************************************** 489 * * 490 * This should get fixed to use kmalloc(.., GFP_ATOMIC) * 491 * followed later on by kfree(). -ml * 492 * * 493 **************************************************************/ 494 495static struct request *idetape_next_rq_storage(ide_drive_t *drive) 496{ 497 idetape_tape_t *tape = drive->driver_data; 498 499 debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index); 500 501 if (tape->rq_stack_index == IDETAPE_PC_STACK) 502 tape->rq_stack_index = 0; 503 return (&tape->rq_stack[tape->rq_stack_index++]); 504} 505 506/* 507 * called on each failed packet command retry to analyze the request sense. We 508 * currently do not utilize this information. 509 */ 510static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) 511{ 512 idetape_tape_t *tape = drive->driver_data; 513 struct ide_atapi_pc *pc = tape->failed_pc; 514 515 tape->sense_key = sense[2] & 0xF; 516 tape->asc = sense[12]; 517 tape->ascq = sense[13]; 518 519 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", 520 pc->c[0], tape->sense_key, tape->asc, tape->ascq); 521 522 /* Correct pc->xferred by asking the tape. */ 523 if (pc->flags & PC_FLAG_DMA_ERROR) { 524 pc->xferred = pc->req_xfer - 525 tape->blk_size * 526 get_unaligned_be32(&sense[3]); 527 idetape_update_buffers(drive, pc); 528 } 529 530 /* 531 * If error was the result of a zero-length read or write command, 532 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 533 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 534 */ 535 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) 536 /* length == 0 */ 537 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { 538 if (tape->sense_key == 5) { 539 /* don't report an error, everything's ok */ 540 pc->error = 0; 541 /* don't retry read/write */ 542 pc->flags |= PC_FLAG_ABORT; 543 } 544 } 545 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { 546 pc->error = IDETAPE_ERROR_FILEMARK; 547 pc->flags |= PC_FLAG_ABORT; 548 } 549 if (pc->c[0] == WRITE_6) { 550 if ((sense[2] & 0x40) || (tape->sense_key == 0xd 551 && tape->asc == 0x0 && tape->ascq == 0x2)) { 552 pc->error = IDETAPE_ERROR_EOD; 553 pc->flags |= PC_FLAG_ABORT; 554 } 555 } 556 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 557 if (tape->sense_key == 8) { 558 pc->error = IDETAPE_ERROR_EOD; 559 pc->flags |= PC_FLAG_ABORT; 560 } 561 if (!(pc->flags & PC_FLAG_ABORT) && 562 pc->xferred) 563 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 564 } 565} 566 567/* Free data buffers completely. */ 568static void ide_tape_kfree_buffer(idetape_tape_t *tape) 569{ 570 struct idetape_bh *prev_bh, *bh = tape->merge_bh; 571 572 while (bh) { 573 u32 size = bh->b_size; 574 575 while (size) { 576 unsigned int order = fls(size >> PAGE_SHIFT)-1; 577 578 if (bh->b_data) 579 free_pages((unsigned long)bh->b_data, order); 580 581 size &= (order-1); 582 bh->b_data += (1 << order) * PAGE_SIZE; 583 } 584 prev_bh = bh; 585 bh = bh->b_reqnext; 586 kfree(prev_bh); 587 } 588 kfree(tape->merge_bh); 589} 590 591static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) 592{ 593 struct request *rq = HWGROUP(drive)->rq; 594 idetape_tape_t *tape = drive->driver_data; 595 unsigned long flags; 596 int error; 597 598 debug_log(DBG_PROCS, "Enter %s\n", __func__); 599 600 switch (uptodate) { 601 case 0: error = IDETAPE_ERROR_GENERAL; break; 602 case 1: error = 0; break; 603 default: error = uptodate; 604 } 605 rq->errors = error; 606 if (error) 607 tape->failed_pc = NULL; 608 609 if (!blk_special_request(rq)) { 610 ide_end_request(drive, uptodate, nr_sects); 611 return 0; 612 } 613 614 spin_lock_irqsave(&tape->lock, flags); 615 616 ide_end_drive_cmd(drive, 0, 0); 617 618 spin_unlock_irqrestore(&tape->lock, flags); 619 return 0; 620} 621 622static void ide_tape_callback(ide_drive_t *drive) 623{ 624 idetape_tape_t *tape = drive->driver_data; 625 struct ide_atapi_pc *pc = tape->pc; 626 int uptodate = pc->error ? 0 : 1; 627 628 debug_log(DBG_PROCS, "Enter %s\n", __func__); 629 630 if (tape->failed_pc == pc) 631 tape->failed_pc = NULL; 632 633 if (pc->c[0] == REQUEST_SENSE) { 634 if (uptodate) 635 idetape_analyze_error(drive, pc->buf); 636 else 637 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " 638 "itself - Aborting request!\n"); 639 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { 640 struct request *rq = drive->hwif->hwgroup->rq; 641 int blocks = pc->xferred / tape->blk_size; 642 643 tape->avg_size += blocks * tape->blk_size; 644 645 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 646 tape->avg_speed = tape->avg_size * HZ / 647 (jiffies - tape->avg_time) / 1024; 648 tape->avg_size = 0; 649 tape->avg_time = jiffies; 650 } 651 652 tape->first_frame += blocks; 653 rq->current_nr_sectors -= blocks; 654 655 if (pc->error) 656 uptodate = pc->error; 657 } else if (pc->c[0] == READ_POSITION && uptodate) { 658 u8 *readpos = tape->pc->buf; 659 660 debug_log(DBG_SENSE, "BOP - %s\n", 661 (readpos[0] & 0x80) ? "Yes" : "No"); 662 debug_log(DBG_SENSE, "EOP - %s\n", 663 (readpos[0] & 0x40) ? "Yes" : "No"); 664 665 if (readpos[0] & 0x4) { 666 printk(KERN_INFO "ide-tape: Block location is unknown" 667 "to the tape\n"); 668 clear_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); 669 uptodate = 0; 670 } else { 671 debug_log(DBG_SENSE, "Block Location - %u\n", 672 be32_to_cpu(*(u32 *)&readpos[4])); 673 674 tape->partition = readpos[1]; 675 tape->first_frame = be32_to_cpu(*(u32 *)&readpos[4]); 676 set_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags); 677 } 678 } 679 680 idetape_end_request(drive, uptodate, 0); 681} 682 683static void idetape_init_pc(struct ide_atapi_pc *pc) 684{ 685 memset(pc->c, 0, 12); 686 pc->retries = 0; 687 pc->flags = 0; 688 pc->req_xfer = 0; 689 pc->buf = pc->pc_buf; 690 pc->buf_size = IDETAPE_PC_BUFFER_SIZE; 691 pc->bh = NULL; 692 pc->b_data = NULL; 693 pc->callback = ide_tape_callback; 694} 695 696static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc) 697{ 698 idetape_init_pc(pc); 699 pc->c[0] = REQUEST_SENSE; 700 pc->c[4] = 20; 701 pc->req_xfer = 20; 702} 703 704static void idetape_init_rq(struct request *rq, u8 cmd) 705{ 706 blk_rq_init(NULL, rq); 707 rq->cmd_type = REQ_TYPE_SPECIAL; 708 rq->cmd[0] = cmd; 709} 710 711/* 712 * Generate a new packet command request in front of the request queue, before 713 * the current request, so that it will be processed immediately, on the next 714 * pass through the driver. The function below is called from the request 715 * handling part of the driver (the "bottom" part). Safe storage for the request 716 * should be allocated with ide_tape_next_{pc,rq}_storage() prior to that. 717 * 718 * Memory for those requests is pre-allocated at initialization time, and is 719 * limited to IDETAPE_PC_STACK requests. We assume that we have enough space for 720 * the maximum possible number of inter-dependent packet commands. 721 * 722 * The higher level of the driver - The ioctl handler and the character device 723 * handling functions should queue request to the lower level part and wait for 724 * their completion using idetape_queue_pc_tail or idetape_queue_rw_tail. 725 */ 726static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc, 727 struct request *rq) 728{ 729 struct ide_tape_obj *tape = drive->driver_data; 730 731 idetape_init_rq(rq, REQ_IDETAPE_PC1); 732 rq->cmd_flags |= REQ_PREEMPT; 733 rq->buffer = (char *) pc; 734 rq->rq_disk = tape->disk; 735 ide_do_drive_cmd(drive, rq); 736} 737 738/* 739 * idetape_retry_pc is called when an error was detected during the 740 * last packet command. We queue a request sense packet command in 741 * the head of the request list. 742 */ 743static void idetape_retry_pc(ide_drive_t *drive) 744{ 745 idetape_tape_t *tape = drive->driver_data; 746 struct ide_atapi_pc *pc; 747 struct request *rq; 748 749 (void)ide_read_error(drive); 750 pc = idetape_next_pc_storage(drive); 751 rq = idetape_next_rq_storage(drive); 752 idetape_create_request_sense_cmd(pc); 753 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); 754 idetape_queue_pc_head(drive, pc, rq); 755} 756 757/* 758 * Postpone the current request so that ide.c will be able to service requests 759 * from another device on the same hwgroup while we are polling for DSC. 760 */ 761static void idetape_postpone_request(ide_drive_t *drive) 762{ 763 idetape_tape_t *tape = drive->driver_data; 764 765 debug_log(DBG_PROCS, "Enter %s\n", __func__); 766 767 tape->postponed_rq = HWGROUP(drive)->rq; 768 ide_stall_queue(drive, tape->dsc_poll_freq); 769} 770 771static void ide_tape_handle_dsc(ide_drive_t *drive) 772{ 773 idetape_tape_t *tape = drive->driver_data; 774 775 /* Media access command */ 776 tape->dsc_polling_start = jiffies; 777 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; 778 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 779 /* Allow ide.c to handle other requests */ 780 idetape_postpone_request(drive); 781} 782 783static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, 784 unsigned int bcount, int write) 785{ 786 if (write) 787 idetape_output_buffers(drive, pc, bcount); 788 else 789 idetape_input_buffers(drive, pc, bcount); 790} 791 792/* 793 * This is the usual interrupt handler which will be called during a packet 794 * command. We will transfer some of the data (as requested by the drive) and 795 * will re-point interrupt handler to us. When data transfer is finished, we 796 * will act according to the algorithm described before 797 * idetape_issue_pc. 798 */ 799static ide_startstop_t idetape_pc_intr(ide_drive_t *drive) 800{ 801 idetape_tape_t *tape = drive->driver_data; 802 803 return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD, 804 NULL, idetape_update_buffers, idetape_retry_pc, 805 ide_tape_handle_dsc, ide_tape_io_buffers); 806} 807 808/* 809 * Packet Command Interface 810 * 811 * The current Packet Command is available in tape->pc, and will not change 812 * until we finish handling it. Each packet command is associated with a 813 * callback function that will be called when the command is finished. 814 * 815 * The handling will be done in three stages: 816 * 817 * 1. idetape_issue_pc will send the packet command to the drive, and will set 818 * the interrupt handler to idetape_pc_intr. 819 * 820 * 2. On each interrupt, idetape_pc_intr will be called. This step will be 821 * repeated until the device signals us that no more interrupts will be issued. 822 * 823 * 3. ATAPI Tape media access commands have immediate status with a delayed 824 * process. In case of a successful initiation of a media access packet command, 825 * the DSC bit will be set when the actual execution of the command is finished. 826 * Since the tape drive will not issue an interrupt, we have to poll for this 827 * event. In this case, we define the request as "low priority request" by 828 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and 829 * exit the driver. 830 * 831 * ide.c will then give higher priority to requests which originate from the 832 * other device, until will change rq_status to RQ_ACTIVE. 833 * 834 * 4. When the packet command is finished, it will be checked for errors. 835 * 836 * 5. In case an error was found, we queue a request sense packet command in 837 * front of the request queue and retry the operation up to 838 * IDETAPE_MAX_PC_RETRIES times. 839 * 840 * 6. In case no error was found, or we decided to give up and not to retry 841 * again, the callback function will be called and then we will handle the next 842 * request. 843 */ 844static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 845{ 846 idetape_tape_t *tape = drive->driver_data; 847 848 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr, 849 IDETAPE_WAIT_CMD, NULL); 850} 851 852static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, 853 struct ide_atapi_pc *pc) 854{ 855 idetape_tape_t *tape = drive->driver_data; 856 857 if (tape->pc->c[0] == REQUEST_SENSE && 858 pc->c[0] == REQUEST_SENSE) { 859 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " 860 "Two request sense in serial were issued\n"); 861 } 862 863 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) 864 tape->failed_pc = pc; 865 /* Set the current packet command */ 866 tape->pc = pc; 867 868 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 869 (pc->flags & PC_FLAG_ABORT)) { 870 /* 871 * We will "abort" retrying a packet command in case legitimate 872 * error code was received (crossing a filemark, or end of the 873 * media, for example). 874 */ 875 if (!(pc->flags & PC_FLAG_ABORT)) { 876 if (!(pc->c[0] == TEST_UNIT_READY && 877 tape->sense_key == 2 && tape->asc == 4 && 878 (tape->ascq == 1 || tape->ascq == 8))) { 879 printk(KERN_ERR "ide-tape: %s: I/O error, " 880 "pc = %2x, key = %2x, " 881 "asc = %2x, ascq = %2x\n", 882 tape->name, pc->c[0], 883 tape->sense_key, tape->asc, 884 tape->ascq); 885 } 886 /* Giving up */ 887 pc->error = IDETAPE_ERROR_GENERAL; 888 } 889 tape->failed_pc = NULL; 890 pc->callback(drive); 891 return ide_stopped; 892 } 893 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); 894 895 pc->retries++; 896 897 return ide_issue_pc(drive, pc, idetape_transfer_pc, 898 IDETAPE_WAIT_CMD, NULL); 899} 900 901/* A mode sense command is used to "sense" tape parameters. */ 902static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) 903{ 904 idetape_init_pc(pc); 905 pc->c[0] = MODE_SENSE; 906 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 907 /* DBD = 1 - Don't return block descriptors */ 908 pc->c[1] = 8; 909 pc->c[2] = page_code; 910 /* 911 * Changed pc->c[3] to 0 (255 will at best return unused info). 912 * 913 * For SCSI this byte is defined as subpage instead of high byte 914 * of length and some IDE drives seem to interpret it this way 915 * and return an error when 255 is used. 916 */ 917 pc->c[3] = 0; 918 /* We will just discard data in that case */ 919 pc->c[4] = 255; 920 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 921 pc->req_xfer = 12; 922 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 923 pc->req_xfer = 24; 924 else 925 pc->req_xfer = 50; 926} 927 928static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) 929{ 930 idetape_tape_t *tape = drive->driver_data; 931 struct ide_atapi_pc *pc = tape->pc; 932 u8 stat; 933 934 stat = ide_read_status(drive); 935 936 if (stat & SEEK_STAT) { 937 if (stat & ERR_STAT) { 938 /* Error detected */ 939 if (pc->c[0] != TEST_UNIT_READY) 940 printk(KERN_ERR "ide-tape: %s: I/O error, ", 941 tape->name); 942 /* Retry operation */ 943 idetape_retry_pc(drive); 944 return ide_stopped; 945 } 946 pc->error = 0; 947 } else { 948 pc->error = IDETAPE_ERROR_GENERAL; 949 tape->failed_pc = NULL; 950 } 951 pc->callback(drive); 952 return ide_stopped; 953} 954 955static void ide_tape_create_rw_cmd(idetape_tape_t *tape, 956 struct ide_atapi_pc *pc, unsigned int length, 957 struct idetape_bh *bh, u8 opcode) 958{ 959 idetape_init_pc(pc); 960 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); 961 pc->c[1] = 1; 962 pc->bh = bh; 963 pc->buf = NULL; 964 pc->buf_size = length * tape->blk_size; 965 pc->req_xfer = pc->buf_size; 966 if (pc->req_xfer == tape->buffer_size) 967 pc->flags |= PC_FLAG_DMA_OK; 968 969 if (opcode == READ_6) { 970 pc->c[0] = READ_6; 971 atomic_set(&bh->b_count, 0); 972 } else if (opcode == WRITE_6) { 973 pc->c[0] = WRITE_6; 974 pc->flags |= PC_FLAG_WRITING; 975 pc->b_data = bh->b_data; 976 pc->b_count = atomic_read(&bh->b_count); 977 } 978} 979 980static ide_startstop_t idetape_do_request(ide_drive_t *drive, 981 struct request *rq, sector_t block) 982{ 983 idetape_tape_t *tape = drive->driver_data; 984 struct ide_atapi_pc *pc = NULL; 985 struct request *postponed_rq = tape->postponed_rq; 986 u8 stat; 987 988 debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld," 989 " current_nr_sectors: %d\n", 990 rq->sector, rq->nr_sectors, rq->current_nr_sectors); 991 992 if (!blk_special_request(rq)) { 993 /* We do not support buffer cache originated requests. */ 994 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 995 "request queue (%d)\n", drive->name, rq->cmd_type); 996 ide_end_request(drive, 0, 0); 997 return ide_stopped; 998 } 999 1000 /* Retry a failed packet command */ 1001 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) { 1002 pc = tape->failed_pc; 1003 goto out; 1004 } 1005 1006 if (postponed_rq != NULL) 1007 if (rq != postponed_rq) { 1008 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 1009 "Two DSC requests were queued\n"); 1010 idetape_end_request(drive, 0, 0); 1011 return ide_stopped; 1012 } 1013 1014 tape->postponed_rq = NULL; 1015 1016 /* 1017 * If the tape is still busy, postpone our request and service 1018 * the other device meanwhile. 1019 */ 1020 stat = ide_read_status(drive); 1021 1022 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) 1023 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); 1024 1025 if (drive->post_reset == 1) { 1026 set_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags); 1027 drive->post_reset = 0; 1028 } 1029 1030 if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) && 1031 (stat & SEEK_STAT) == 0) { 1032 if (postponed_rq == NULL) { 1033 tape->dsc_polling_start = jiffies; 1034 tape->dsc_poll_freq = tape->best_dsc_rw_freq; 1035 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 1036 } else if (time_after(jiffies, tape->dsc_timeout)) { 1037 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 1038 tape->name); 1039 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 1040 idetape_media_access_finished(drive); 1041 return ide_stopped; 1042 } else { 1043 return ide_do_reset(drive); 1044 } 1045 } else if (time_after(jiffies, 1046 tape->dsc_polling_start + 1047 IDETAPE_DSC_MA_THRESHOLD)) 1048 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; 1049 idetape_postpone_request(drive); 1050 return ide_stopped; 1051 } 1052 if (rq->cmd[0] & REQ_IDETAPE_READ) { 1053 pc = idetape_next_pc_storage(drive); 1054 ide_tape_create_rw_cmd(tape, pc, rq->current_nr_sectors, 1055 (struct idetape_bh *)rq->special, 1056 READ_6); 1057 goto out; 1058 } 1059 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 1060 pc = idetape_next_pc_storage(drive); 1061 ide_tape_create_rw_cmd(tape, pc, rq->current_nr_sectors, 1062 (struct idetape_bh *)rq->special, 1063 WRITE_6); 1064 goto out; 1065 } 1066 if (rq->cmd[0] & REQ_IDETAPE_PC1) { 1067 pc = (struct ide_atapi_pc *) rq->buffer; 1068 rq->cmd[0] &= ~(REQ_IDETAPE_PC1); 1069 rq->cmd[0] |= REQ_IDETAPE_PC2; 1070 goto out; 1071 } 1072 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 1073 idetape_media_access_finished(drive); 1074 return ide_stopped; 1075 } 1076 BUG(); 1077out: 1078 if (test_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags)) 1079 pc->flags |= PC_FLAG_DRQ_INTERRUPT; 1080 1081 return idetape_issue_pc(drive, pc); 1082} 1083 1084/* 1085 * The function below uses __get_free_pages to allocate a data buffer of size 1086 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as 1087 * much as possible. 1088 * 1089 * It returns a pointer to the newly allocated buffer, or NULL in case of 1090 * failure. 1091 */ 1092static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, 1093 int full, int clear) 1094{ 1095 struct idetape_bh *prev_bh, *bh, *merge_bh; 1096 int pages = tape->pages_per_buffer; 1097 unsigned int order, b_allocd; 1098 char *b_data = NULL; 1099 1100 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 1101 bh = merge_bh; 1102 if (bh == NULL) 1103 goto abort; 1104 1105 order = fls(pages) - 1; 1106 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); 1107 if (!bh->b_data) 1108 goto abort; 1109 b_allocd = (1 << order) * PAGE_SIZE; 1110 pages &= (order-1); 1111 1112 if (clear) 1113 memset(bh->b_data, 0, b_allocd); 1114 bh->b_reqnext = NULL; 1115 bh->b_size = b_allocd; 1116 atomic_set(&bh->b_count, full ? bh->b_size : 0); 1117 1118 while (pages) { 1119 order = fls(pages) - 1; 1120 b_data = (char *) __get_free_pages(GFP_KERNEL, order); 1121 if (!b_data) 1122 goto abort; 1123 b_allocd = (1 << order) * PAGE_SIZE; 1124 1125 if (clear) 1126 memset(b_data, 0, b_allocd); 1127 1128 /* newly allocated page frames below buffer header or ...*/ 1129 if (bh->b_data == b_data + b_allocd) { 1130 bh->b_size += b_allocd; 1131 bh->b_data -= b_allocd; 1132 if (full) 1133 atomic_add(b_allocd, &bh->b_count); 1134 continue; 1135 } 1136 /* they are above the header */ 1137 if (b_data == bh->b_data + bh->b_size) { 1138 bh->b_size += b_allocd; 1139 if (full) 1140 atomic_add(b_allocd, &bh->b_count); 1141 continue; 1142 } 1143 prev_bh = bh; 1144 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 1145 if (!bh) { 1146 free_pages((unsigned long) b_data, order); 1147 goto abort; 1148 } 1149 bh->b_reqnext = NULL; 1150 bh->b_data = b_data; 1151 bh->b_size = b_allocd; 1152 atomic_set(&bh->b_count, full ? bh->b_size : 0); 1153 prev_bh->b_reqnext = bh; 1154 1155 pages &= (order-1); 1156 } 1157 1158 bh->b_size -= tape->excess_bh_size; 1159 if (full) 1160 atomic_sub(tape->excess_bh_size, &bh->b_count); 1161 return merge_bh; 1162abort: 1163 ide_tape_kfree_buffer(tape); 1164 return NULL; 1165} 1166 1167static int idetape_copy_stage_from_user(idetape_tape_t *tape, 1168 const char __user *buf, int n) 1169{ 1170 struct idetape_bh *bh = tape->bh; 1171 int count; 1172 int ret = 0; 1173 1174 while (n) { 1175 if (bh == NULL) { 1176 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 1177 __func__); 1178 return 1; 1179 } 1180 count = min((unsigned int) 1181 (bh->b_size - atomic_read(&bh->b_count)), 1182 (unsigned int)n); 1183 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, 1184 count)) 1185 ret = 1; 1186 n -= count; 1187 atomic_add(count, &bh->b_count); 1188 buf += count; 1189 if (atomic_read(&bh->b_count) == bh->b_size) { 1190 bh = bh->b_reqnext; 1191 if (bh) 1192 atomic_set(&bh->b_count, 0); 1193 } 1194 } 1195 tape->bh = bh; 1196 return ret; 1197} 1198 1199static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, 1200 int n) 1201{ 1202 struct idetape_bh *bh = tape->bh; 1203 int count; 1204 int ret = 0; 1205 1206 while (n) { 1207 if (bh == NULL) { 1208 printk(KERN_ERR "ide-tape: bh == NULL in %s\n", 1209 __func__); 1210 return 1; 1211 } 1212 count = min(tape->b_count, n); 1213 if (copy_to_user(buf, tape->b_data, count)) 1214 ret = 1; 1215 n -= count; 1216 tape->b_data += count; 1217 tape->b_count -= count; 1218 buf += count; 1219 if (!tape->b_count) { 1220 bh = bh->b_reqnext; 1221 tape->bh = bh; 1222 if (bh) { 1223 tape->b_data = bh->b_data; 1224 tape->b_count = atomic_read(&bh->b_count); 1225 } 1226 } 1227 } 1228 return ret; 1229} 1230 1231static void idetape_init_merge_buffer(idetape_tape_t *tape) 1232{ 1233 struct idetape_bh *bh = tape->merge_bh; 1234 tape->bh = tape->merge_bh; 1235 1236 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 1237 atomic_set(&bh->b_count, 0); 1238 else { 1239 tape->b_data = bh->b_data; 1240 tape->b_count = atomic_read(&bh->b_count); 1241 } 1242} 1243 1244/* 1245 * Write a filemark if write_filemark=1. Flush the device buffers without 1246 * writing a filemark otherwise. 1247 */ 1248static void idetape_create_write_filemark_cmd(ide_drive_t *drive, 1249 struct ide_atapi_pc *pc, int write_filemark) 1250{ 1251 idetape_init_pc(pc); 1252 pc->c[0] = WRITE_FILEMARKS; 1253 pc->c[4] = write_filemark; 1254 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1255} 1256 1257static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc) 1258{ 1259 idetape_init_pc(pc); 1260 pc->c[0] = TEST_UNIT_READY; 1261} 1262 1263/* 1264 * We add a special packet command request to the tail of the request queue, and 1265 * wait for it to be serviced. This is not to be called from within the request 1266 * handling part of the driver! We allocate here data on the stack and it is 1267 * valid until the request is finished. This is not the case for the bottom part 1268 * of the driver, where we are always leaving the functions to wait for an 1269 * interrupt or a timer event. 1270 * 1271 * From the bottom part of the driver, we should allocate safe memory using 1272 * idetape_next_pc_storage() and ide_tape_next_rq_storage(), and add the request 1273 * to the request list without waiting for it to be serviced! In that case, we 1274 * usually use idetape_queue_pc_head(). 1275 */ 1276static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc) 1277{ 1278 struct ide_tape_obj *tape = drive->driver_data; 1279 struct request *rq; 1280 int error; 1281 1282 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 1283 rq->cmd_type = REQ_TYPE_SPECIAL; 1284 rq->cmd[0] = REQ_IDETAPE_PC1; 1285 rq->buffer = (char *)pc; 1286 error = blk_execute_rq(drive->queue, tape->disk, rq, 0); 1287 blk_put_request(rq); 1288 return error; 1289} 1290 1291static void idetape_create_load_unload_cmd(ide_drive_t *drive, 1292 struct ide_atapi_pc *pc, int cmd) 1293{ 1294 idetape_init_pc(pc); 1295 pc->c[0] = START_STOP; 1296 pc->c[4] = cmd; 1297 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1298} 1299 1300static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 1301{ 1302 idetape_tape_t *tape = drive->driver_data; 1303 struct ide_atapi_pc pc; 1304 int load_attempted = 0; 1305 1306 /* Wait for the tape to become ready */ 1307 set_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); 1308 timeout += jiffies; 1309 while (time_before(jiffies, timeout)) { 1310 idetape_create_test_unit_ready_cmd(&pc); 1311 if (!idetape_queue_pc_tail(drive, &pc)) 1312 return 0; 1313 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 1314 || (tape->asc == 0x3A)) { 1315 /* no media */ 1316 if (load_attempted) 1317 return -ENOMEDIUM; 1318 idetape_create_load_unload_cmd(drive, &pc, 1319 IDETAPE_LU_LOAD_MASK); 1320 idetape_queue_pc_tail(drive, &pc); 1321 load_attempted = 1; 1322 /* not about to be ready */ 1323 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 1324 (tape->ascq == 1 || tape->ascq == 8))) 1325 return -EIO; 1326 msleep(100); 1327 } 1328 return -EIO; 1329} 1330 1331static int idetape_flush_tape_buffers(ide_drive_t *drive) 1332{ 1333 struct ide_atapi_pc pc; 1334 int rc; 1335 1336 idetape_create_write_filemark_cmd(drive, &pc, 0); 1337 rc = idetape_queue_pc_tail(drive, &pc); 1338 if (rc) 1339 return rc; 1340 idetape_wait_ready(drive, 60 * 5 * HZ); 1341 return 0; 1342} 1343 1344static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) 1345{ 1346 idetape_init_pc(pc); 1347 pc->c[0] = READ_POSITION; 1348 pc->req_xfer = 20; 1349} 1350 1351static int idetape_read_position(ide_drive_t *drive) 1352{ 1353 idetape_tape_t *tape = drive->driver_data; 1354 struct ide_atapi_pc pc; 1355 int position; 1356 1357 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1358 1359 idetape_create_read_position_cmd(&pc); 1360 if (idetape_queue_pc_tail(drive, &pc)) 1361 return -1; 1362 position = tape->first_frame; 1363 return position; 1364} 1365 1366static void idetape_create_locate_cmd(ide_drive_t *drive, 1367 struct ide_atapi_pc *pc, 1368 unsigned int block, u8 partition, int skip) 1369{ 1370 idetape_init_pc(pc); 1371 pc->c[0] = POSITION_TO_ELEMENT; 1372 pc->c[1] = 2; 1373 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); 1374 pc->c[8] = partition; 1375 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1376} 1377 1378static int idetape_create_prevent_cmd(ide_drive_t *drive, 1379 struct ide_atapi_pc *pc, int prevent) 1380{ 1381 idetape_tape_t *tape = drive->driver_data; 1382 1383 /* device supports locking according to capabilities page */ 1384 if (!(tape->caps[6] & 0x01)) 1385 return 0; 1386 1387 idetape_init_pc(pc); 1388 pc->c[0] = ALLOW_MEDIUM_REMOVAL; 1389 pc->c[4] = prevent; 1390 return 1; 1391} 1392 1393static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) 1394{ 1395 idetape_tape_t *tape = drive->driver_data; 1396 1397 if (tape->chrdev_dir != IDETAPE_DIR_READ) 1398 return; 1399 1400 clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags); 1401 tape->merge_bh_size = 0; 1402 if (tape->merge_bh != NULL) { 1403 ide_tape_kfree_buffer(tape); 1404 tape->merge_bh = NULL; 1405 } 1406 1407 tape->chrdev_dir = IDETAPE_DIR_NONE; 1408} 1409 1410/* 1411 * Position the tape to the requested block using the LOCATE packet command. 1412 * A READ POSITION command is then issued to check where we are positioned. Like 1413 * all higher level operations, we queue the commands at the tail of the request 1414 * queue and wait for their completion. 1415 */ 1416static int idetape_position_tape(ide_drive_t *drive, unsigned int block, 1417 u8 partition, int skip) 1418{ 1419 idetape_tape_t *tape = drive->driver_data; 1420 int retval; 1421 struct ide_atapi_pc pc; 1422 1423 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1424 __ide_tape_discard_merge_buffer(drive); 1425 idetape_wait_ready(drive, 60 * 5 * HZ); 1426 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 1427 retval = idetape_queue_pc_tail(drive, &pc); 1428 if (retval) 1429 return (retval); 1430 1431 idetape_create_read_position_cmd(&pc); 1432 return (idetape_queue_pc_tail(drive, &pc)); 1433} 1434 1435static void ide_tape_discard_merge_buffer(ide_drive_t *drive, 1436 int restore_position) 1437{ 1438 idetape_tape_t *tape = drive->driver_data; 1439 int seek, position; 1440 1441 __ide_tape_discard_merge_buffer(drive); 1442 if (restore_position) { 1443 position = idetape_read_position(drive); 1444 seek = position > 0 ? position : 0; 1445 if (idetape_position_tape(drive, seek, 0, 0)) { 1446 printk(KERN_INFO "ide-tape: %s: position_tape failed in" 1447 " %s\n", tape->name, __func__); 1448 return; 1449 } 1450 } 1451} 1452 1453/* 1454 * Generate a read/write request for the block device interface and wait for it 1455 * to be serviced. 1456 */ 1457static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, 1458 struct idetape_bh *bh) 1459{ 1460 idetape_tape_t *tape = drive->driver_data; 1461 struct request *rq; 1462 int ret, errors; 1463 1464 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); 1465 1466 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 1467 rq->cmd_type = REQ_TYPE_SPECIAL; 1468 rq->cmd[0] = cmd; 1469 rq->rq_disk = tape->disk; 1470 rq->special = (void *)bh; 1471 rq->sector = tape->first_frame; 1472 rq->nr_sectors = blocks; 1473 rq->current_nr_sectors = blocks; 1474 blk_execute_rq(drive->queue, tape->disk, rq, 0); 1475 1476 errors = rq->errors; 1477 ret = tape->blk_size * (blocks - rq->current_nr_sectors); 1478 blk_put_request(rq); 1479 1480 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) 1481 return 0; 1482 1483 if (tape->merge_bh) 1484 idetape_init_merge_buffer(tape); 1485 if (errors == IDETAPE_ERROR_GENERAL) 1486 return -EIO; 1487 return ret; 1488} 1489 1490static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) 1491{ 1492 idetape_init_pc(pc); 1493 pc->c[0] = INQUIRY; 1494 pc->c[4] = 254; 1495 pc->req_xfer = 254; 1496} 1497 1498static void idetape_create_rewind_cmd(ide_drive_t *drive, 1499 struct ide_atapi_pc *pc) 1500{ 1501 idetape_init_pc(pc); 1502 pc->c[0] = REZERO_UNIT; 1503 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1504} 1505 1506static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) 1507{ 1508 idetape_init_pc(pc); 1509 pc->c[0] = ERASE; 1510 pc->c[1] = 1; 1511 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1512} 1513 1514static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) 1515{ 1516 idetape_init_pc(pc); 1517 pc->c[0] = SPACE; 1518 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); 1519 pc->c[1] = cmd; 1520 pc->flags |= PC_FLAG_WAIT_FOR_DSC; 1521} 1522 1523/* Queue up a character device originated write request. */ 1524static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) 1525{ 1526 idetape_tape_t *tape = drive->driver_data; 1527 1528 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 1529 1530 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 1531 blocks, tape->merge_bh); 1532} 1533 1534static void ide_tape_flush_merge_buffer(ide_drive_t *drive) 1535{ 1536 idetape_tape_t *tape = drive->driver_data; 1537 int blocks, min; 1538 struct idetape_bh *bh; 1539 1540 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 1541 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" 1542 " but we are not writing.\n"); 1543 return; 1544 } 1545 if (tape->merge_bh_size > tape->buffer_size) { 1546 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 1547 tape->merge_bh_size = tape->buffer_size; 1548 } 1549 if (tape->merge_bh_size) { 1550 blocks = tape->merge_bh_size / tape->blk_size; 1551 if (tape->merge_bh_size % tape->blk_size) { 1552 unsigned int i; 1553 1554 blocks++; 1555 i = tape->blk_size - tape->merge_bh_size % 1556 tape->blk_size; 1557 bh = tape->bh->b_reqnext; 1558 while (bh) { 1559 atomic_set(&bh->b_count, 0); 1560 bh = bh->b_reqnext; 1561 } 1562 bh = tape->bh; 1563 while (i) { 1564 if (bh == NULL) { 1565 printk(KERN_INFO "ide-tape: bug," 1566 " bh NULL\n"); 1567 break; 1568 } 1569 min = min(i, (unsigned int)(bh->b_size - 1570 atomic_read(&bh->b_count))); 1571 memset(bh->b_data + atomic_read(&bh->b_count), 1572 0, min); 1573 atomic_add(min, &bh->b_count); 1574 i -= min; 1575 bh = bh->b_reqnext; 1576 } 1577 } 1578 (void) idetape_add_chrdev_write_request(drive, blocks); 1579 tape->merge_bh_size = 0; 1580 } 1581 if (tape->merge_bh != NULL) { 1582 ide_tape_kfree_buffer(tape); 1583 tape->merge_bh = NULL; 1584 } 1585 tape->chrdev_dir = IDETAPE_DIR_NONE; 1586} 1587 1588static int idetape_init_read(ide_drive_t *drive) 1589{ 1590 idetape_tape_t *tape = drive->driver_data; 1591 int bytes_read; 1592 1593 /* Initialize read operation */ 1594 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1595 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 1596 ide_tape_flush_merge_buffer(drive); 1597 idetape_flush_tape_buffers(drive); 1598 } 1599 if (tape->merge_bh || tape->merge_bh_size) { 1600 printk(KERN_ERR "ide-tape: merge_bh_size should be" 1601 " 0 now\n"); 1602 tape->merge_bh_size = 0; 1603 } 1604 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); 1605 if (!tape->merge_bh) 1606 return -ENOMEM; 1607 tape->chrdev_dir = IDETAPE_DIR_READ; 1608 1609 /* 1610 * Issue a read 0 command to ensure that DSC handshake is 1611 * switched from completion mode to buffer available mode. 1612 * No point in issuing this if DSC overlap isn't supported, some 1613 * drives (Seagate STT3401A) will return an error. 1614 */ 1615 if (drive->dsc_overlap) { 1616 bytes_read = idetape_queue_rw_tail(drive, 1617 REQ_IDETAPE_READ, 0, 1618 tape->merge_bh); 1619 if (bytes_read < 0) { 1620 ide_tape_kfree_buffer(tape); 1621 tape->merge_bh = NULL; 1622 tape->chrdev_dir = IDETAPE_DIR_NONE; 1623 return bytes_read; 1624 } 1625 } 1626 } 1627 1628 return 0; 1629} 1630 1631/* called from idetape_chrdev_read() to service a chrdev read request. */ 1632static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) 1633{ 1634 idetape_tape_t *tape = drive->driver_data; 1635 1636 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); 1637 1638 /* If we are at a filemark, return a read length of 0 */ 1639 if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) 1640 return 0; 1641 1642 idetape_init_read(drive); 1643 1644 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, 1645 tape->merge_bh); 1646} 1647 1648static void idetape_pad_zeros(ide_drive_t *drive, int bcount) 1649{ 1650 idetape_tape_t *tape = drive->driver_data; 1651 struct idetape_bh *bh; 1652 int blocks; 1653 1654 while (bcount) { 1655 unsigned int count; 1656 1657 bh = tape->merge_bh; 1658 count = min(tape->buffer_size, bcount); 1659 bcount -= count; 1660 blocks = count / tape->blk_size; 1661 while (count) { 1662 atomic_set(&bh->b_count, 1663 min(count, (unsigned int)bh->b_size)); 1664 memset(bh->b_data, 0, atomic_read(&bh->b_count)); 1665 count -= atomic_read(&bh->b_count); 1666 bh = bh->b_reqnext; 1667 } 1668 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, 1669 tape->merge_bh); 1670 } 1671} 1672 1673/* 1674 * Rewinds the tape to the Beginning Of the current Partition (BOP). We 1675 * currently support only one partition. 1676 */ 1677static int idetape_rewind_tape(ide_drive_t *drive) 1678{ 1679 int retval; 1680 struct ide_atapi_pc pc; 1681 idetape_tape_t *tape; 1682 tape = drive->driver_data; 1683 1684 debug_log(DBG_SENSE, "Enter %s\n", __func__); 1685 1686 idetape_create_rewind_cmd(drive, &pc); 1687 retval = idetape_queue_pc_tail(drive, &pc); 1688 if (retval) 1689 return retval; 1690 1691 idetape_create_read_position_cmd(&pc); 1692 retval = idetape_queue_pc_tail(drive, &pc); 1693 if (retval) 1694 return retval; 1695 return 0; 1696} 1697 1698/* mtio.h compatible commands should be issued to the chrdev interface. */ 1699static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, 1700 unsigned long arg) 1701{ 1702 idetape_tape_t *tape = drive->driver_data; 1703 void __user *argp = (void __user *)arg; 1704 1705 struct idetape_config { 1706 int dsc_rw_frequency; 1707 int dsc_media_access_frequency; 1708 int nr_stages; 1709 } config; 1710 1711 debug_log(DBG_PROCS, "Enter %s\n", __func__); 1712 1713 switch (cmd) { 1714 case 0x0340: 1715 if (copy_from_user(&config, argp, sizeof(config))) 1716 return -EFAULT; 1717 tape->best_dsc_rw_freq = config.dsc_rw_frequency; 1718 break; 1719 case 0x0350: 1720 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; 1721 config.nr_stages = 1; 1722 if (copy_to_user(argp, &config, sizeof(config))) 1723 return -EFAULT; 1724 break; 1725 default: 1726 return -EIO; 1727 } 1728 return 0; 1729} 1730 1731static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, 1732 int mt_count) 1733{ 1734 idetape_tape_t *tape = drive->driver_data; 1735 struct ide_atapi_pc pc; 1736 int retval, count = 0; 1737 int sprev = !!(tape->caps[4] & 0x20); 1738 1739 if (mt_count == 0) 1740 return 0; 1741 if (MTBSF == mt_op || MTBSFM == mt_op) { 1742 if (!sprev) 1743 return -EIO; 1744 mt_count = -mt_count; 1745 } 1746 1747 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 1748 tape->merge_bh_size = 0; 1749 if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) 1750 ++count; 1751 ide_tape_discard_merge_buffer(drive, 0); 1752 } 1753 1754 switch (mt_op) { 1755 case MTFSF: 1756 case MTBSF: 1757 idetape_create_space_cmd(&pc, mt_count - count, 1758 IDETAPE_SPACE_OVER_FILEMARK); 1759 return idetape_queue_pc_tail(drive, &pc); 1760 case MTFSFM: 1761 case MTBSFM: 1762 if (!sprev) 1763 return -EIO; 1764 retval = idetape_space_over_filemarks(drive, MTFSF, 1765 mt_count - count); 1766 if (retval) 1767 return retval; 1768 count = (MTBSFM == mt_op ? 1 : -1); 1769 return idetape_space_over_filemarks(drive, MTFSF, count); 1770 default: 1771 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 1772 mt_op); 1773 return -EIO; 1774 } 1775} 1776 1777/* 1778 * Our character device read / write functions. 1779 * 1780 * The tape is optimized to maximize throughput when it is transferring an 1781 * integral number of the "continuous transfer limit", which is a parameter of 1782 * the specific tape (26kB on my particular tape, 32kB for Onstream). 1783 * 1784 * As of version 1.3 of the driver, the character device provides an abstract 1785 * continuous view of the media - any mix of block sizes (even 1 byte) on the 1786 * same backup/restore procedure is supported. The driver will internally 1787 * convert the requests to the recommended transfer unit, so that an unmatch 1788 * between the user's block size to the recommended size will only result in a 1789 * (slightly) increased driver overhead, but will no longer hit performance. 1790 * This is not applicable to Onstream. 1791 */ 1792static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, 1793 size_t count, loff_t *ppos) 1794{ 1795 struct ide_tape_obj *tape = ide_tape_f(file); 1796 ide_drive_t *drive = tape->drive; 1797 ssize_t bytes_read, temp, actually_read = 0, rc; 1798 ssize_t ret = 0; 1799 u16 ctl = *(u16 *)&tape->caps[12]; 1800 1801 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1802 1803 if (tape->chrdev_dir != IDETAPE_DIR_READ) { 1804 if (test_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags)) 1805 if (count > tape->blk_size && 1806 (count % tape->blk_size) == 0) 1807 tape->user_bs_factor = count / tape->blk_size; 1808 } 1809 rc = idetape_init_read(drive); 1810 if (rc < 0) 1811 return rc; 1812 if (count == 0) 1813 return (0); 1814 if (tape->merge_bh_size) { 1815 actually_read = min((unsigned int)(tape->merge_bh_size), 1816 (unsigned int)count); 1817 if (idetape_copy_stage_to_user(tape, buf, actually_read)) 1818 ret = -EFAULT; 1819 buf += actually_read; 1820 tape->merge_bh_size -= actually_read; 1821 count -= actually_read; 1822 } 1823 while (count >= tape->buffer_size) { 1824 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1825 if (bytes_read <= 0) 1826 goto finish; 1827 if (idetape_copy_stage_to_user(tape, buf, bytes_read)) 1828 ret = -EFAULT; 1829 buf += bytes_read; 1830 count -= bytes_read; 1831 actually_read += bytes_read; 1832 } 1833 if (count) { 1834 bytes_read = idetape_add_chrdev_read_request(drive, ctl); 1835 if (bytes_read <= 0) 1836 goto finish; 1837 temp = min((unsigned long)count, (unsigned long)bytes_read); 1838 if (idetape_copy_stage_to_user(tape, buf, temp)) 1839 ret = -EFAULT; 1840 actually_read += temp; 1841 tape->merge_bh_size = bytes_read-temp; 1842 } 1843finish: 1844 if (!actually_read && test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags)) { 1845 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); 1846 1847 idetape_space_over_filemarks(drive, MTFSF, 1); 1848 return 0; 1849 } 1850 1851 return ret ? ret : actually_read; 1852} 1853 1854static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, 1855 size_t count, loff_t *ppos) 1856{ 1857 struct ide_tape_obj *tape = ide_tape_f(file); 1858 ide_drive_t *drive = tape->drive; 1859 ssize_t actually_written = 0; 1860 ssize_t ret = 0; 1861 u16 ctl = *(u16 *)&tape->caps[12]; 1862 1863 /* The drive is write protected. */ 1864 if (tape->write_prot) 1865 return -EACCES; 1866 1867 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); 1868 1869 /* Initialize write operation */ 1870 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { 1871 if (tape->chrdev_dir == IDETAPE_DIR_READ) 1872 ide_tape_discard_merge_buffer(drive, 1); 1873 if (tape->merge_bh || tape->merge_bh_size) { 1874 printk(KERN_ERR "ide-tape: merge_bh_size " 1875 "should be 0 now\n"); 1876 tape->merge_bh_size = 0; 1877 } 1878 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); 1879 if (!tape->merge_bh) 1880 return -ENOMEM; 1881 tape->chrdev_dir = IDETAPE_DIR_WRITE; 1882 idetape_init_merge_buffer(tape); 1883 1884 /* 1885 * Issue a write 0 command to ensure that DSC handshake is 1886 * switched from completion mode to buffer available mode. No 1887 * point in issuing this if DSC overlap isn't supported, some 1888 * drives (Seagate STT3401A) will return an error. 1889 */ 1890 if (drive->dsc_overlap) { 1891 ssize_t retval = idetape_queue_rw_tail(drive, 1892 REQ_IDETAPE_WRITE, 0, 1893 tape->merge_bh); 1894 if (retval < 0) { 1895 ide_tape_kfree_buffer(tape); 1896 tape->merge_bh = NULL; 1897 tape->chrdev_dir = IDETAPE_DIR_NONE; 1898 return retval; 1899 } 1900 } 1901 } 1902 if (count == 0) 1903 return (0); 1904 if (tape->merge_bh_size) { 1905 if (tape->merge_bh_size >= tape->buffer_size) { 1906 printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); 1907 tape->merge_bh_size = 0; 1908 } 1909 actually_written = min((unsigned int) 1910 (tape->buffer_size - tape->merge_bh_size), 1911 (unsigned int)count); 1912 if (idetape_copy_stage_from_user(tape, buf, actually_written)) 1913 ret = -EFAULT; 1914 buf += actually_written; 1915 tape->merge_bh_size += actually_written; 1916 count -= actually_written; 1917 1918 if (tape->merge_bh_size == tape->buffer_size) { 1919 ssize_t retval; 1920 tape->merge_bh_size = 0; 1921 retval = idetape_add_chrdev_write_request(drive, ctl); 1922 if (retval <= 0) 1923 return (retval); 1924 } 1925 } 1926 while (count >= tape->buffer_size) { 1927 ssize_t retval; 1928 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) 1929 ret = -EFAULT; 1930 buf += tape->buffer_size; 1931 count -= tape->buffer_size; 1932 retval = idetape_add_chrdev_write_request(drive, ctl); 1933 actually_written += tape->buffer_size; 1934 if (retval <= 0) 1935 return (retval); 1936 } 1937 if (count) { 1938 actually_written += count; 1939 if (idetape_copy_stage_from_user(tape, buf, count)) 1940 ret = -EFAULT; 1941 tape->merge_bh_size += count; 1942 } 1943 return ret ? ret : actually_written; 1944} 1945 1946static int idetape_write_filemark(ide_drive_t *drive) 1947{ 1948 struct ide_atapi_pc pc; 1949 1950 /* Write a filemark */ 1951 idetape_create_write_filemark_cmd(drive, &pc, 1); 1952 if (idetape_queue_pc_tail(drive, &pc)) { 1953 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 1954 return -EIO; 1955 } 1956 return 0; 1957} 1958 1959/* 1960 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is 1961 * requested. 1962 * 1963 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support 1964 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also 1965 * usually not supported. 1966 * 1967 * The following commands are currently not supported: 1968 * 1969 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, 1970 * MT_ST_WRITE_THRESHOLD. 1971 */ 1972static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) 1973{ 1974 idetape_tape_t *tape = drive->driver_data; 1975 struct ide_atapi_pc pc; 1976 int i, retval; 1977 1978 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", 1979 mt_op, mt_count); 1980 1981 switch (mt_op) { 1982 case MTFSF: 1983 case MTFSFM: 1984 case MTBSF: 1985 case MTBSFM: 1986 if (!mt_count) 1987 return 0; 1988 return idetape_space_over_filemarks(drive, mt_op, mt_count); 1989 default: 1990 break; 1991 } 1992 1993 switch (mt_op) { 1994 case MTWEOF: 1995 if (tape->write_prot) 1996 return -EACCES; 1997 ide_tape_discard_merge_buffer(drive, 1); 1998 for (i = 0; i < mt_count; i++) { 1999 retval = idetape_write_filemark(drive); 2000 if (retval) 2001 return retval; 2002 } 2003 return 0; 2004 case MTREW: 2005 ide_tape_discard_merge_buffer(drive, 0); 2006 if (idetape_rewind_tape(drive)) 2007 return -EIO; 2008 return 0; 2009 case MTLOAD: 2010 ide_tape_discard_merge_buffer(drive, 0); 2011 idetape_create_load_unload_cmd(drive, &pc, 2012 IDETAPE_LU_LOAD_MASK); 2013 return idetape_queue_pc_tail(drive, &pc); 2014 case MTUNLOAD: 2015 case MTOFFL: 2016 /* 2017 * If door is locked, attempt to unlock before 2018 * attempting to eject. 2019 */ 2020 if (tape->door_locked) { 2021 if (idetape_create_prevent_cmd(drive, &pc, 0)) 2022 if (!idetape_queue_pc_tail(drive, &pc)) 2023 tape->door_locked = DOOR_UNLOCKED; 2024 } 2025 ide_tape_discard_merge_buffer(drive, 0); 2026 idetape_create_load_unload_cmd(drive, &pc, 2027 !IDETAPE_LU_LOAD_MASK); 2028 retval = idetape_queue_pc_tail(drive, &pc); 2029 if (!retval) 2030 clear_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags); 2031 return retval; 2032 case MTNOP: 2033 ide_tape_discard_merge_buffer(drive, 0); 2034 return idetape_flush_tape_buffers(drive); 2035 case MTRETEN: 2036 ide_tape_discard_merge_buffer(drive, 0); 2037 idetape_create_load_unload_cmd(drive, &pc, 2038 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 2039 return idetape_queue_pc_tail(drive, &pc); 2040 case MTEOM: 2041 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 2042 return idetape_queue_pc_tail(drive, &pc); 2043 case MTERASE: 2044 (void)idetape_rewind_tape(drive); 2045 idetape_create_erase_cmd(&pc); 2046 return idetape_queue_pc_tail(drive, &pc); 2047 case MTSETBLK: 2048 if (mt_count) { 2049 if (mt_count < tape->blk_size || 2050 mt_count % tape->blk_size) 2051 return -EIO; 2052 tape->user_bs_factor = mt_count / tape->blk_size; 2053 clear_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); 2054 } else 2055 set_bit(IDETAPE_FLAG_DETECT_BS, &tape->flags); 2056 return 0; 2057 case MTSEEK: 2058 ide_tape_discard_merge_buffer(drive, 0); 2059 return idetape_position_tape(drive, 2060 mt_count * tape->user_bs_factor, tape->partition, 0); 2061 case MTSETPART: 2062 ide_tape_discard_merge_buffer(drive, 0); 2063 return idetape_position_tape(drive, 0, mt_count, 0); 2064 case MTFSR: 2065 case MTBSR: 2066 case MTLOCK: 2067 if (!idetape_create_prevent_cmd(drive, &pc, 1)) 2068 return 0; 2069 retval = idetape_queue_pc_tail(drive, &pc); 2070 if (retval) 2071 return retval; 2072 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 2073 return 0; 2074 case MTUNLOCK: 2075 if (!idetape_create_prevent_cmd(drive, &pc, 0)) 2076 return 0; 2077 retval = idetape_queue_pc_tail(drive, &pc); 2078 if (retval) 2079 return retval; 2080 tape->door_locked = DOOR_UNLOCKED; 2081 return 0; 2082 default: 2083 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", 2084 mt_op); 2085 return -EIO; 2086 } 2087} 2088 2089/* 2090 * Our character device ioctls. General mtio.h magnetic io commands are 2091 * supported here, and not in the corresponding block interface. Our own 2092 * ide-tape ioctls are supported on both interfaces. 2093 */ 2094static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, 2095 unsigned int cmd, unsigned long arg) 2096{ 2097 struct ide_tape_obj *tape = ide_tape_f(file); 2098 ide_drive_t *drive = tape->drive; 2099 struct mtop mtop; 2100 struct mtget mtget; 2101 struct mtpos mtpos; 2102 int block_offset = 0, position = tape->first_frame; 2103 void __user *argp = (void __user *)arg; 2104 2105 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); 2106 2107 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { 2108 ide_tape_flush_merge_buffer(drive); 2109 idetape_flush_tape_buffers(drive); 2110 } 2111 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 2112 block_offset = tape->merge_bh_size / 2113 (tape->blk_size * tape->user_bs_factor); 2114 position = idetape_read_position(drive); 2115 if (position < 0) 2116 return -EIO; 2117 } 2118 switch (cmd) { 2119 case MTIOCTOP: 2120 if (copy_from_user(&mtop, argp, sizeof(struct mtop))) 2121 return -EFAULT; 2122 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); 2123 case MTIOCGET: 2124 memset(&mtget, 0, sizeof(struct mtget)); 2125 mtget.mt_type = MT_ISSCSI2; 2126 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 2127 mtget.mt_dsreg = 2128 ((tape->blk_size * tape->user_bs_factor) 2129 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 2130 2131 if (tape->drv_write_prot) 2132 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 2133 2134 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 2135 return -EFAULT; 2136 return 0; 2137 case MTIOCPOS: 2138 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 2139 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 2140 return -EFAULT; 2141 return 0; 2142 default: 2143 if (tape->chrdev_dir == IDETAPE_DIR_READ) 2144 ide_tape_discard_merge_buffer(drive, 1); 2145 return idetape_blkdev_ioctl(drive, cmd, arg); 2146 } 2147} 2148 2149/* 2150 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape 2151 * block size with the reported value. 2152 */ 2153static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) 2154{ 2155 idetape_tape_t *tape = drive->driver_data; 2156 struct ide_atapi_pc pc; 2157 2158 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 2159 if (idetape_queue_pc_tail(drive, &pc)) { 2160 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 2161 if (tape->blk_size == 0) { 2162 printk(KERN_WARNING "ide-tape: Cannot deal with zero " 2163 "block size, assuming 32k\n"); 2164 tape->blk_size = 32768; 2165 } 2166 return; 2167 } 2168 tape->blk_size = (pc.buf[4 + 5] << 16) + 2169 (pc.buf[4 + 6] << 8) + 2170 pc.buf[4 + 7]; 2171 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; 2172} 2173 2174static int idetape_chrdev_open(struct inode *inode, struct file *filp) 2175{ 2176 unsigned int minor = iminor(inode), i = minor & ~0xc0; 2177 ide_drive_t *drive; 2178 idetape_tape_t *tape; 2179 struct ide_atapi_pc pc; 2180 int retval; 2181 2182 if (i >= MAX_HWIFS * MAX_DRIVES) 2183 return -ENXIO; 2184 2185 tape = ide_tape_chrdev_get(i); 2186 if (!tape) 2187 return -ENXIO; 2188 2189 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 2190 2191 /* 2192 * We really want to do nonseekable_open(inode, filp); here, but some 2193 * versions of tar incorrectly call lseek on tapes and bail out if that 2194 * fails. So we disallow pread() and pwrite(), but permit lseeks. 2195 */ 2196 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 2197 2198 drive = tape->drive; 2199 2200 filp->private_data = tape; 2201 2202 if (test_and_set_bit(IDETAPE_FLAG_BUSY, &tape->flags)) { 2203 retval = -EBUSY; 2204 goto out_put_tape; 2205 } 2206 2207 retval = idetape_wait_ready(drive, 60 * HZ); 2208 if (retval) { 2209 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); 2210 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 2211 goto out_put_tape; 2212 } 2213 2214 idetape_read_position(drive); 2215 if (!test_bit(IDETAPE_FLAG_ADDRESS_VALID, &tape->flags)) 2216 (void)idetape_rewind_tape(drive); 2217 2218 /* Read block size and write protect status from drive. */ 2219 ide_tape_get_bsize_from_bdesc(drive); 2220 2221 /* Set write protect flag if device is opened as read-only. */ 2222 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 2223 tape->write_prot = 1; 2224 else 2225 tape->write_prot = tape->drv_write_prot; 2226 2227 /* Make sure drive isn't write protected if user wants to write. */ 2228 if (tape->write_prot) { 2229 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 2230 (filp->f_flags & O_ACCMODE) == O_RDWR) { 2231 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); 2232 retval = -EROFS; 2233 goto out_put_tape; 2234 } 2235 } 2236 2237 /* Lock the tape drive door so user can't eject. */ 2238 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 2239 if (idetape_create_prevent_cmd(drive, &pc, 1)) { 2240 if (!idetape_queue_pc_tail(drive, &pc)) { 2241 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 2242 tape->door_locked = DOOR_LOCKED; 2243 } 2244 } 2245 } 2246 return 0; 2247 2248out_put_tape: 2249 ide_tape_put(tape); 2250 return retval; 2251} 2252 2253static void idetape_write_release(ide_drive_t *drive, unsigned int minor) 2254{ 2255 idetape_tape_t *tape = drive->driver_data; 2256 2257 ide_tape_flush_merge_buffer(drive); 2258 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); 2259 if (tape->merge_bh != NULL) { 2260 idetape_pad_zeros(drive, tape->blk_size * 2261 (tape->user_bs_factor - 1)); 2262 ide_tape_kfree_buffer(tape); 2263 tape->merge_bh = NULL; 2264 } 2265 idetape_write_filemark(drive); 2266 idetape_flush_tape_buffers(drive); 2267 idetape_flush_tape_buffers(drive); 2268} 2269 2270static int idetape_chrdev_release(struct inode *inode, struct file *filp) 2271{ 2272 struct ide_tape_obj *tape = ide_tape_f(filp); 2273 ide_drive_t *drive = tape->drive; 2274 struct ide_atapi_pc pc; 2275 unsigned int minor = iminor(inode); 2276 2277 lock_kernel(); 2278 tape = drive->driver_data; 2279 2280 debug_log(DBG_CHRDEV, "Enter %s\n", __func__); 2281 2282 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) 2283 idetape_write_release(drive, minor); 2284 if (tape->chrdev_dir == IDETAPE_DIR_READ) { 2285 if (minor < 128) 2286 ide_tape_discard_merge_buffer(drive, 1); 2287 } 2288 2289 if (minor < 128 && test_bit(IDETAPE_FLAG_MEDIUM_PRESENT, &tape->flags)) 2290 (void) idetape_rewind_tape(drive); 2291 if (tape->chrdev_dir == IDETAPE_DIR_NONE) { 2292 if (tape->door_locked == DOOR_LOCKED) { 2293 if (idetape_create_prevent_cmd(drive, &pc, 0)) { 2294 if (!idetape_queue_pc_tail(drive, &pc)) 2295 tape->door_locked = DOOR_UNLOCKED; 2296 } 2297 } 2298 } 2299 clear_bit(IDETAPE_FLAG_BUSY, &tape->flags); 2300 ide_tape_put(tape); 2301 unlock_kernel(); 2302 return 0; 2303} 2304 2305/* 2306 * check the contents of the ATAPI IDENTIFY command results. We return: 2307 * 2308 * 1 - If the tape can be supported by us, based on the information we have so 2309 * far. 2310 * 2311 * 0 - If this tape driver is not currently supported by us. 2312 */ 2313static int idetape_identify_device(ide_drive_t *drive) 2314{ 2315 u8 gcw[2], protocol, device_type, removable, packet_size; 2316 2317 if (drive->id_read == 0) 2318 return 1; 2319 2320 *((unsigned short *) &gcw) = drive->id->config; 2321 2322 protocol = (gcw[1] & 0xC0) >> 6; 2323 device_type = gcw[1] & 0x1F; 2324 removable = !!(gcw[0] & 0x80); 2325 packet_size = gcw[0] & 0x3; 2326 2327 /* Check that we can support this device */ 2328 if (protocol != 2) 2329 printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n", 2330 protocol); 2331 else if (device_type != 1) 2332 printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set " 2333 "to tape\n", device_type); 2334 else if (!removable) 2335 printk(KERN_ERR "ide-tape: The removable flag is not set\n"); 2336 else if (packet_size != 0) { 2337 printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12" 2338 " bytes\n", packet_size); 2339 } else 2340 return 1; 2341 return 0; 2342} 2343 2344static void idetape_get_inquiry_results(ide_drive_t *drive) 2345{ 2346 idetape_tape_t *tape = drive->driver_data; 2347 struct ide_atapi_pc pc; 2348 char fw_rev[6], vendor_id[10], product_id[18]; 2349 2350 idetape_create_inquiry_cmd(&pc); 2351 if (idetape_queue_pc_tail(drive, &pc)) { 2352 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", 2353 tape->name); 2354 return; 2355 } 2356 memcpy(vendor_id, &pc.buf[8], 8); 2357 memcpy(product_id, &pc.buf[16], 16); 2358 memcpy(fw_rev, &pc.buf[32], 4); 2359 2360 ide_fixstring(vendor_id, 10, 0); 2361 ide_fixstring(product_id, 18, 0); 2362 ide_fixstring(fw_rev, 6, 0); 2363 2364 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", 2365 drive->name, tape->name, vendor_id, product_id, fw_rev); 2366} 2367 2368/* 2369 * Ask the tape about its various parameters. In particular, we will adjust our 2370 * data transfer buffer size to the recommended value as returned by the tape. 2371 */ 2372static void idetape_get_mode_sense_results(ide_drive_t *drive) 2373{ 2374 idetape_tape_t *tape = drive->driver_data; 2375 struct ide_atapi_pc pc; 2376 u8 *caps; 2377 u8 speed, max_speed; 2378 2379 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 2380 if (idetape_queue_pc_tail(drive, &pc)) { 2381 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" 2382 " some default values\n"); 2383 tape->blk_size = 512; 2384 put_unaligned(52, (u16 *)&tape->caps[12]); 2385 put_unaligned(540, (u16 *)&tape->caps[14]); 2386 put_unaligned(6*52, (u16 *)&tape->caps[16]); 2387 return; 2388 } 2389 caps = pc.buf + 4 + pc.buf[3]; 2390 2391 /* convert to host order and save for later use */ 2392 speed = be16_to_cpu(*(u16 *)&caps[14]); 2393 max_speed = be16_to_cpu(*(u16 *)&caps[8]); 2394 2395 put_unaligned(max_speed, (u16 *)&caps[8]); 2396 put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]); 2397 put_unaligned(speed, (u16 *)&caps[14]); 2398 put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]); 2399 2400 if (!speed) { 2401 printk(KERN_INFO "ide-tape: %s: invalid tape speed " 2402 "(assuming 650KB/sec)\n", drive->name); 2403 put_unaligned(650, (u16 *)&caps[14]); 2404 } 2405 if (!max_speed) { 2406 printk(KERN_INFO "ide-tape: %s: invalid max_speed " 2407 "(assuming 650KB/sec)\n", drive->name); 2408 put_unaligned(650, (u16 *)&caps[8]); 2409 } 2410 2411 memcpy(&tape->caps, caps, 20); 2412 if (caps[7] & 0x02) 2413 tape->blk_size = 512; 2414 else if (caps[7] & 0x04) 2415 tape->blk_size = 1024; 2416} 2417 2418#ifdef CONFIG_IDE_PROC_FS 2419static void idetape_add_settings(ide_drive_t *drive) 2420{ 2421 idetape_tape_t *tape = drive->driver_data; 2422 2423 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 2424 1, 2, (u16 *)&tape->caps[16], NULL); 2425 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 2426 1, 1, (u16 *)&tape->caps[14], NULL); 2427 ide_add_setting(drive, "buffer_size", SETTING_READ, TYPE_INT, 0, 0xffff, 2428 1, 1024, &tape->buffer_size, NULL); 2429 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, 2430 IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_freq, 2431 NULL); 2432 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 2433 1, &drive->dsc_overlap, NULL); 2434 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 2435 1, 1, &tape->avg_speed, NULL); 2436 ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 2437 1, &tape->debug_mask, NULL); 2438} 2439#else 2440static inline void idetape_add_settings(ide_drive_t *drive) { ; } 2441#endif 2442 2443/* 2444 * The function below is called to: 2445 * 2446 * 1. Initialize our various state variables. 2447 * 2. Ask the tape for its capabilities. 2448 * 3. Allocate a buffer which will be used for data transfer. The buffer size 2449 * is chosen based on the recommendation which we received in step 2. 2450 * 2451 * Note that at this point ide.c already assigned us an irq, so that we can 2452 * queue requests here and wait for their completion. 2453 */ 2454static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) 2455{ 2456 unsigned long t; 2457 int speed; 2458 int buffer_size; 2459 u8 gcw[2]; 2460 u16 *ctl = (u16 *)&tape->caps[12]; 2461 2462 spin_lock_init(&tape->lock); 2463 drive->dsc_overlap = 1; 2464 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 2465 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 2466 tape->name); 2467 drive->dsc_overlap = 0; 2468 } 2469 /* Seagate Travan drives do not support DSC overlap. */ 2470 if (strstr(drive->id->model, "Seagate STT3401")) 2471 drive->dsc_overlap = 0; 2472 tape->minor = minor; 2473 tape->name[0] = 'h'; 2474 tape->name[1] = 't'; 2475 tape->name[2] = '0' + minor; 2476 tape->chrdev_dir = IDETAPE_DIR_NONE; 2477 tape->pc = tape->pc_stack; 2478 *((unsigned short *) &gcw) = drive->id->config; 2479 2480 /* Command packet DRQ type */ 2481 if (((gcw[0] & 0x60) >> 5) == 1) 2482 set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags); 2483 2484 idetape_get_inquiry_results(drive); 2485 idetape_get_mode_sense_results(drive); 2486 ide_tape_get_bsize_from_bdesc(drive); 2487 tape->user_bs_factor = 1; 2488 tape->buffer_size = *ctl * tape->blk_size; 2489 while (tape->buffer_size > 0xffff) { 2490 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 2491 *ctl /= 2; 2492 tape->buffer_size = *ctl * tape->blk_size; 2493 } 2494 buffer_size = tape->buffer_size; 2495 tape->pages_per_buffer = buffer_size / PAGE_SIZE; 2496 if (buffer_size % PAGE_SIZE) { 2497 tape->pages_per_buffer++; 2498 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; 2499 } 2500 2501 /* select the "best" DSC read/write polling freq */ 2502 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); 2503 2504 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); 2505 2506 /* 2507 * Ensure that the number we got makes sense; limit it within 2508 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 2509 */ 2510 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, 2511 IDETAPE_DSC_RW_MAX); 2512 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 2513 "%lums tDSC%s\n", 2514 drive->name, tape->name, *(u16 *)&tape->caps[14], 2515 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, 2516 tape->buffer_size / 1024, 2517 tape->best_dsc_rw_freq * 1000 / HZ, 2518 drive->using_dma ? ", DMA":""); 2519 2520 idetape_add_settings(drive); 2521} 2522 2523static void ide_tape_remove(ide_drive_t *drive) 2524{ 2525 idetape_tape_t *tape = drive->driver_data; 2526 2527 ide_proc_unregister_driver(drive, tape->driver); 2528 2529 ide_unregister_region(tape->disk); 2530 2531 ide_tape_put(tape); 2532} 2533 2534static void ide_tape_release(struct kref *kref) 2535{ 2536 struct ide_tape_obj *tape = to_ide_tape(kref); 2537 ide_drive_t *drive = tape->drive; 2538 struct gendisk *g = tape->disk; 2539 2540 BUG_ON(tape->merge_bh_size); 2541 2542 drive->dsc_overlap = 0; 2543 drive->driver_data = NULL; 2544 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 2545 device_destroy(idetape_sysfs_class, 2546 MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 2547 idetape_devs[tape->minor] = NULL; 2548 g->private_data = NULL; 2549 put_disk(g); 2550 kfree(tape); 2551} 2552 2553#ifdef CONFIG_IDE_PROC_FS 2554static int proc_idetape_read_name 2555 (char *page, char **start, off_t off, int count, int *eof, void *data) 2556{ 2557 ide_drive_t *drive = (ide_drive_t *) data; 2558 idetape_tape_t *tape = drive->driver_data; 2559 char *out = page; 2560 int len; 2561 2562 len = sprintf(out, "%s\n", tape->name); 2563 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 2564} 2565 2566static ide_proc_entry_t idetape_proc[] = { 2567 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 2568 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 2569 { NULL, 0, NULL, NULL } 2570}; 2571#endif 2572 2573static int ide_tape_probe(ide_drive_t *); 2574 2575static ide_driver_t idetape_driver = { 2576 .gen_driver = { 2577 .owner = THIS_MODULE, 2578 .name = "ide-tape", 2579 .bus = &ide_bus_type, 2580 }, 2581 .probe = ide_tape_probe, 2582 .remove = ide_tape_remove, 2583 .version = IDETAPE_VERSION, 2584 .media = ide_tape, 2585 .supports_dsc_overlap = 1, 2586 .do_request = idetape_do_request, 2587 .end_request = idetape_end_request, 2588 .error = __ide_error, 2589 .abort = __ide_abort, 2590#ifdef CONFIG_IDE_PROC_FS 2591 .proc = idetape_proc, 2592#endif 2593}; 2594 2595/* Our character device supporting functions, passed to register_chrdev. */ 2596static const struct file_operations idetape_fops = { 2597 .owner = THIS_MODULE, 2598 .read = idetape_chrdev_read, 2599 .write = idetape_chrdev_write, 2600 .ioctl = idetape_chrdev_ioctl, 2601 .open = idetape_chrdev_open, 2602 .release = idetape_chrdev_release, 2603}; 2604 2605static int idetape_open(struct inode *inode, struct file *filp) 2606{ 2607 struct gendisk *disk = inode->i_bdev->bd_disk; 2608 struct ide_tape_obj *tape; 2609 2610 tape = ide_tape_get(disk); 2611 if (!tape) 2612 return -ENXIO; 2613 2614 return 0; 2615} 2616 2617static int idetape_release(struct inode *inode, struct file *filp) 2618{ 2619 struct gendisk *disk = inode->i_bdev->bd_disk; 2620 struct ide_tape_obj *tape = ide_tape_g(disk); 2621 2622 ide_tape_put(tape); 2623 2624 return 0; 2625} 2626 2627static int idetape_ioctl(struct inode *inode, struct file *file, 2628 unsigned int cmd, unsigned long arg) 2629{ 2630 struct block_device *bdev = inode->i_bdev; 2631 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); 2632 ide_drive_t *drive = tape->drive; 2633 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 2634 if (err == -EINVAL) 2635 err = idetape_blkdev_ioctl(drive, cmd, arg); 2636 return err; 2637} 2638 2639static struct block_device_operations idetape_block_ops = { 2640 .owner = THIS_MODULE, 2641 .open = idetape_open, 2642 .release = idetape_release, 2643 .ioctl = idetape_ioctl, 2644}; 2645 2646static int ide_tape_probe(ide_drive_t *drive) 2647{ 2648 idetape_tape_t *tape; 2649 struct gendisk *g; 2650 int minor; 2651 2652 if (!strstr("ide-tape", drive->driver_req)) 2653 goto failed; 2654 if (!drive->present) 2655 goto failed; 2656 if (drive->media != ide_tape) 2657 goto failed; 2658 if (!idetape_identify_device(drive)) { 2659 printk(KERN_ERR "ide-tape: %s: not supported by this version of" 2660 " the driver\n", drive->name); 2661 goto failed; 2662 } 2663 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); 2664 if (tape == NULL) { 2665 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", 2666 drive->name); 2667 goto failed; 2668 } 2669 2670 g = alloc_disk(1 << PARTN_BITS); 2671 if (!g) 2672 goto out_free_tape; 2673 2674 ide_init_disk(g, drive); 2675 2676 ide_proc_register_driver(drive, &idetape_driver); 2677 2678 kref_init(&tape->kref); 2679 2680 tape->drive = drive; 2681 tape->driver = &idetape_driver; 2682 tape->disk = g; 2683 2684 g->private_data = &tape->driver; 2685 2686 drive->driver_data = tape; 2687 2688 mutex_lock(&idetape_ref_mutex); 2689 for (minor = 0; idetape_devs[minor]; minor++) 2690 ; 2691 idetape_devs[minor] = tape; 2692 mutex_unlock(&idetape_ref_mutex); 2693 2694 idetape_setup(drive, tape, minor); 2695 2696 device_create(idetape_sysfs_class, &drive->gendev, 2697 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); 2698 device_create(idetape_sysfs_class, &drive->gendev, 2699 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); 2700 2701 g->fops = &idetape_block_ops; 2702 ide_register_region(g); 2703 2704 return 0; 2705 2706out_free_tape: 2707 kfree(tape); 2708failed: 2709 return -ENODEV; 2710} 2711 2712static void __exit idetape_exit(void) 2713{ 2714 driver_unregister(&idetape_driver.gen_driver); 2715 class_destroy(idetape_sysfs_class); 2716 unregister_chrdev(IDETAPE_MAJOR, "ht"); 2717} 2718 2719static int __init idetape_init(void) 2720{ 2721 int error = 1; 2722 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 2723 if (IS_ERR(idetape_sysfs_class)) { 2724 idetape_sysfs_class = NULL; 2725 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 2726 error = -EBUSY; 2727 goto out; 2728 } 2729 2730 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 2731 printk(KERN_ERR "ide-tape: Failed to register chrdev" 2732 " interface\n"); 2733 error = -EBUSY; 2734 goto out_free_class; 2735 } 2736 2737 error = driver_register(&idetape_driver.gen_driver); 2738 if (error) 2739 goto out_free_driver; 2740 2741 return 0; 2742 2743out_free_driver: 2744 driver_unregister(&idetape_driver.gen_driver); 2745out_free_class: 2746 class_destroy(idetape_sysfs_class); 2747out: 2748 return error; 2749} 2750 2751MODULE_ALIAS("ide:*m-tape*"); 2752module_init(idetape_init); 2753module_exit(idetape_exit); 2754MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 2755MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 2756MODULE_LICENSE("GPL"); 2757