ide-tape.c revision 59bca8cc995428c34d8cdfadfa87c8e3f01c4340
1/* 2 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> 3 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz 4 * 5 * $Header$ 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 15/* 16 * IDE ATAPI streaming tape driver. 17 * 18 * This driver is a part of the Linux ide driver and works in co-operation 19 * with linux/drivers/block/ide.c. 20 * 21 * The driver, in co-operation with ide.c, basically traverses the 22 * request-list for the block device interface. The character device 23 * interface, on the other hand, creates new requests, adds them 24 * to the request-list of the block device, and waits for their completion. 25 * 26 * Pipelined operation mode is now supported on both reads and writes. 27 * 28 * The block device major and minor numbers are determined from the 29 * tape's relative position in the ide interfaces, as explained in ide.c. 30 * 31 * The character device interface consists of the following devices: 32 * 33 * ht0 major 37, minor 0 first IDE tape, rewind on close. 34 * ht1 major 37, minor 1 second IDE tape, rewind on close. 35 * ... 36 * nht0 major 37, minor 128 first IDE tape, no rewind on close. 37 * nht1 major 37, minor 129 second IDE tape, no rewind on close. 38 * ... 39 * 40 * Run linux/scripts/MAKEDEV.ide to create the above entries. 41 * 42 * The general magnetic tape commands compatible interface, as defined by 43 * include/linux/mtio.h, is accessible through the character device. 44 * 45 * General ide driver configuration options, such as the interrupt-unmask 46 * flag, can be configured by issuing an ioctl to the block device interface, 47 * as any other ide device. 48 * 49 * Our own ide-tape ioctl's can be issued to either the block device or 50 * the character device interface. 51 * 52 * Maximal throughput with minimal bus load will usually be achieved in the 53 * following scenario: 54 * 55 * 1. ide-tape is operating in the pipelined operation mode. 56 * 2. No buffering is performed by the user backup program. 57 * 58 * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive. 59 * 60 * Ver 0.1 Nov 1 95 Pre-working code :-) 61 * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure 62 * was successful ! (Using tar cvf ... on the block 63 * device interface). 64 * A longer backup resulted in major swapping, bad 65 * overall Linux performance and eventually failed as 66 * we received non serial read-ahead requests from the 67 * buffer cache. 68 * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the 69 * character device interface. Linux's responsiveness 70 * and performance doesn't seem to be much affected 71 * from the background backup procedure. 72 * Some general mtio.h magnetic tape operations are 73 * now supported by our character device. As a result, 74 * popular tape utilities are starting to work with 75 * ide tapes :-) 76 * The following configurations were tested: 77 * 1. An IDE ATAPI TAPE shares the same interface 78 * and irq with an IDE ATAPI CDROM. 79 * 2. An IDE ATAPI TAPE shares the same interface 80 * and irq with a normal IDE disk. 81 * Both configurations seemed to work just fine ! 82 * However, to be on the safe side, it is meanwhile 83 * recommended to give the IDE TAPE its own interface 84 * and irq. 85 * The one thing which needs to be done here is to 86 * add a "request postpone" feature to ide.c, 87 * so that we won't have to wait for the tape to finish 88 * performing a long media access (DSC) request (such 89 * as a rewind) before we can access the other device 90 * on the same interface. This effect doesn't disturb 91 * normal operation most of the time because read/write 92 * requests are relatively fast, and once we are 93 * performing one tape r/w request, a lot of requests 94 * from the other device can be queued and ide.c will 95 * service all of them after this single tape request. 96 * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree. 97 * On each read / write request, we now ask the drive 98 * if we can transfer a constant number of bytes 99 * (a parameter of the drive) only to its buffers, 100 * without causing actual media access. If we can't, 101 * we just wait until we can by polling the DSC bit. 102 * This ensures that while we are not transferring 103 * more bytes than the constant referred to above, the 104 * interrupt latency will not become too high and 105 * we won't cause an interrupt timeout, as happened 106 * occasionally in the previous version. 107 * While polling for DSC, the current request is 108 * postponed and ide.c is free to handle requests from 109 * the other device. This is handled transparently to 110 * ide.c. The hwgroup locking method which was used 111 * in the previous version was removed. 112 * Use of new general features which are provided by 113 * ide.c for use with atapi devices. 114 * (Programming done by Mark Lord) 115 * Few potential bug fixes (Again, suggested by Mark) 116 * Single character device data transfers are now 117 * not limited in size, as they were before. 118 * We are asking the tape about its recommended 119 * transfer unit and send a larger data transfer 120 * as several transfers of the above size. 121 * For best results, use an integral number of this 122 * basic unit (which is shown during driver 123 * initialization). I will soon add an ioctl to get 124 * this important parameter. 125 * Our data transfer buffer is allocated on startup, 126 * rather than before each data transfer. This should 127 * ensure that we will indeed have a data buffer. 128 * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape 129 * shared an interface with another device. 130 * (poll_for_dsc was a complete mess). 131 * Removed some old (non-active) code which had 132 * to do with supporting buffer cache originated 133 * requests. 134 * The block device interface can now be opened, so 135 * that general ide driver features like the unmask 136 * interrupts flag can be selected with an ioctl. 137 * This is the only use of the block device interface. 138 * New fast pipelined operation mode (currently only on 139 * writes). When using the pipelined mode, the 140 * throughput can potentially reach the maximum 141 * tape supported throughput, regardless of the 142 * user backup program. On my tape drive, it sometimes 143 * boosted performance by a factor of 2. Pipelined 144 * mode is enabled by default, but since it has a few 145 * downfalls as well, you may want to disable it. 146 * A short explanation of the pipelined operation mode 147 * is available below. 148 * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition. 149 * Added pipeline read mode. As a result, restores 150 * are now as fast as backups. 151 * Optimized shared interface behavior. The new behavior 152 * typically results in better IDE bus efficiency and 153 * higher tape throughput. 154 * Pre-calculation of the expected read/write request 155 * service time, based on the tape's parameters. In 156 * the pipelined operation mode, this allows us to 157 * adjust our polling frequency to a much lower value, 158 * and thus to dramatically reduce our load on Linux, 159 * without any decrease in performance. 160 * Implemented additional mtio.h operations. 161 * The recommended user block size is returned by 162 * the MTIOCGET ioctl. 163 * Additional minor changes. 164 * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the 165 * use of some block sizes during a restore procedure. 166 * The character device interface will now present a 167 * continuous view of the media - any mix of block sizes 168 * during a backup/restore procedure is supported. The 169 * driver will buffer the requests internally and 170 * convert them to the tape's recommended transfer 171 * unit, making performance almost independent of the 172 * chosen user block size. 173 * Some improvements in error recovery. 174 * By cooperating with ide-dma.c, bus mastering DMA can 175 * now sometimes be used with IDE tape drives as well. 176 * Bus mastering DMA has the potential to dramatically 177 * reduce the CPU's overhead when accessing the device, 178 * and can be enabled by using hdparm -d1 on the tape's 179 * block device interface. For more info, read the 180 * comments in ide-dma.c. 181 * Ver 1.4 Mar 13 96 Fixed serialize support. 182 * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85. 183 * Fixed pipelined read mode inefficiency. 184 * Fixed nasty null dereferencing bug. 185 * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver. 186 * Fixed end of media bug. 187 * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model. 188 * Ver 1.8 Sep 26 96 Attempt to find a better balance between good 189 * interactive response and high system throughput. 190 * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather 191 * than requiring an explicit FSF command. 192 * Abort pending requests at end of media. 193 * MTTELL was sometimes returning incorrect results. 194 * Return the real block size in the MTIOCGET ioctl. 195 * Some error recovery bug fixes. 196 * Ver 1.10 Nov 5 96 Major reorganization. 197 * Reduced CPU overhead a bit by eliminating internal 198 * bounce buffers. 199 * Added module support. 200 * Added multiple tape drives support. 201 * Added partition support. 202 * Rewrote DSC handling. 203 * Some portability fixes. 204 * Removed ide-tape.h. 205 * Additional minor changes. 206 * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling. 207 * Use ide_stall_queue() for DSC overlap. 208 * Use the maximum speed rather than the current speed 209 * to compute the request service time. 210 * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data 211 * corruption, which could occur if the total number 212 * of bytes written to the tape was not an integral 213 * number of tape blocks. 214 * Add support for INTERRUPT DRQ devices. 215 * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB 216 * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives. 217 * Replace cli()/sti() with hwgroup spinlocks. 218 * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup 219 * spinlock with private per-tape spinlock. 220 * Ver 1.16 Sep 1 99 Add OnStream tape support. 221 * Abort read pipeline on EOD. 222 * Wait for the tape to become ready in case it returns 223 * "in the process of becoming ready" on open(). 224 * Fix zero padding of the last written block in 225 * case the tape block size is larger than PAGE_SIZE. 226 * Decrease the default disconnection time to tn. 227 * Ver 1.16e Oct 3 99 Minor fixes. 228 * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen, 229 * niessen@iae.nl / arnold.niessen@philips.com 230 * GO-1) Undefined code in idetape_read_position 231 * according to Gadi's email 232 * AJN-1) Minor fix asc == 11 should be asc == 0x11 233 * in idetape_issue_packet_command (did effect 234 * debugging output only) 235 * AJN-2) Added more debugging output, and 236 * added ide-tape: where missing. I would also 237 * like to add tape->name where possible 238 * AJN-3) Added different debug_level's 239 * via /proc/ide/hdc/settings 240 * "debug_level" determines amount of debugging output; 241 * can be changed using /proc/ide/hdx/settings 242 * 0 : almost no debugging output 243 * 1 : 0+output errors only 244 * 2 : 1+output all sensekey/asc 245 * 3 : 2+follow all chrdev related procedures 246 * 4 : 3+follow all procedures 247 * 5 : 4+include pc_stack rq_stack info 248 * 6 : 5+USE_COUNT updates 249 * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail 250 * from 5 to 10 minutes 251 * AJN-5) Changed maximum number of blocks to skip when 252 * reading tapes with multiple consecutive write 253 * errors from 100 to 1000 in idetape_get_logical_blk 254 * Proposed changes to code: 255 * 1) output "logical_blk_num" via /proc 256 * 2) output "current_operation" via /proc 257 * 3) Either solve or document the fact that `mt rewind' is 258 * required after reading from /dev/nhtx to be 259 * able to rmmod the idetape module; 260 * Also, sometimes an application finishes but the 261 * device remains `busy' for some time. Same cause ? 262 * Proposed changes to release-notes: 263 * 4) write a simple `quickstart' section in the 264 * release notes; I volunteer if you don't want to 265 * 5) include a pointer to video4linux in the doc 266 * to stimulate video applications 267 * 6) release notes lines 331 and 362: explain what happens 268 * if the application data rate is higher than 1100 KB/s; 269 * similar approach to lower-than-500 kB/s ? 270 * 7) 6.6 Comparison; wouldn't it be better to allow different 271 * strategies for read and write ? 272 * Wouldn't it be better to control the tape buffer 273 * contents instead of the bandwidth ? 274 * 8) line 536: replace will by would (if I understand 275 * this section correctly, a hypothetical and unwanted situation 276 * is being described) 277 * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames. 278 * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl 279 * - Add idetape_onstream_mode_sense_tape_parameter_page 280 * function to get tape capacity in frames: tape->capacity. 281 * - Add support for DI-50 drives( or any DI- drive). 282 * - 'workaround' for read error/blank block around block 3000. 283 * - Implement Early warning for end of media for Onstream. 284 * - Cosmetic code changes for readability. 285 * - Idetape_position_tape should not use SKIP bit during 286 * Onstream read recovery. 287 * - Add capacity, logical_blk_num and first/last_frame_position 288 * to /proc/ide/hd?/settings. 289 * - Module use count was gone in the Linux 2.4 driver. 290 * Ver 1.17a Apr 2001 Willem Riede osst@riede.org 291 * - Get drive's actual block size from mode sense block descriptor 292 * - Limit size of pipeline 293 * Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu> 294 * Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used 295 * it in the code! 296 * Actually removed aborted stages in idetape_abort_pipeline 297 * instead of just changing the command code. 298 * Made the transfer byte count for Request Sense equal to the 299 * actual length of the data transfer. 300 * Changed handling of partial data transfers: they do not 301 * cause DMA errors. 302 * Moved initiation of DMA transfers to the correct place. 303 * Removed reference to unallocated memory. 304 * Made __idetape_discard_read_pipeline return the number of 305 * sectors skipped, not the number of stages. 306 * Replaced errant kfree() calls with __idetape_kfree_stage(). 307 * Fixed off-by-one error in testing the pipeline length. 308 * Fixed handling of filemarks in the read pipeline. 309 * Small code optimization for MTBSF and MTBSFM ioctls. 310 * Don't try to unlock the door during device close if is 311 * already unlocked! 312 * Cosmetic fixes to miscellaneous debugging output messages. 313 * Set the minimum /proc/ide/hd?/settings values for "pipeline", 314 * "pipeline_min", and "pipeline_max" to 1. 315 * 316 * Here are some words from the first releases of hd.c, which are quoted 317 * in ide.c and apply here as well: 318 * 319 * | Special care is recommended. Have Fun! 320 * 321 */ 322 323/* 324 * An overview of the pipelined operation mode. 325 * 326 * In the pipelined write mode, we will usually just add requests to our 327 * pipeline and return immediately, before we even start to service them. The 328 * user program will then have enough time to prepare the next request while 329 * we are still busy servicing previous requests. In the pipelined read mode, 330 * the situation is similar - we add read-ahead requests into the pipeline, 331 * before the user even requested them. 332 * 333 * The pipeline can be viewed as a "safety net" which will be activated when 334 * the system load is high and prevents the user backup program from keeping up 335 * with the current tape speed. At this point, the pipeline will get 336 * shorter and shorter but the tape will still be streaming at the same speed. 337 * Assuming we have enough pipeline stages, the system load will hopefully 338 * decrease before the pipeline is completely empty, and the backup program 339 * will be able to "catch up" and refill the pipeline again. 340 * 341 * When using the pipelined mode, it would be best to disable any type of 342 * buffering done by the user program, as ide-tape already provides all the 343 * benefits in the kernel, where it can be done in a more efficient way. 344 * As we will usually not block the user program on a request, the most 345 * efficient user code will then be a simple read-write-read-... cycle. 346 * Any additional logic will usually just slow down the backup process. 347 * 348 * Using the pipelined mode, I get a constant over 400 KBps throughput, 349 * which seems to be the maximum throughput supported by my tape. 350 * 351 * However, there are some downfalls: 352 * 353 * 1. We use memory (for data buffers) in proportional to the number 354 * of pipeline stages (each stage is about 26 KB with my tape). 355 * 2. In the pipelined write mode, we cheat and postpone error codes 356 * to the user task. In read mode, the actual tape position 357 * will be a bit further than the last requested block. 358 * 359 * Concerning (1): 360 * 361 * 1. We allocate stages dynamically only when we need them. When 362 * we don't need them, we don't consume additional memory. In 363 * case we can't allocate stages, we just manage without them 364 * (at the expense of decreased throughput) so when Linux is 365 * tight in memory, we will not pose additional difficulties. 366 * 367 * 2. The maximum number of stages (which is, in fact, the maximum 368 * amount of memory) which we allocate is limited by the compile 369 * time parameter IDETAPE_MAX_PIPELINE_STAGES. 370 * 371 * 3. The maximum number of stages is a controlled parameter - We 372 * don't start from the user defined maximum number of stages 373 * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we 374 * will not even allocate this amount of stages if the user 375 * program can't handle the speed). We then implement a feedback 376 * loop which checks if the pipeline is empty, and if it is, we 377 * increase the maximum number of stages as necessary until we 378 * reach the optimum value which just manages to keep the tape 379 * busy with minimum allocated memory or until we reach 380 * IDETAPE_MAX_PIPELINE_STAGES. 381 * 382 * Concerning (2): 383 * 384 * In pipelined write mode, ide-tape can not return accurate error codes 385 * to the user program since we usually just add the request to the 386 * pipeline without waiting for it to be serviced. In case an error 387 * occurs, I will report it on the next user request. 388 * 389 * In the pipelined read mode, subsequent read requests or forward 390 * filemark spacing will perform correctly, as we preserve all blocks 391 * and filemarks which we encountered during our excess read-ahead. 392 * 393 * For accurate tape positioning and error reporting, disabling 394 * pipelined mode might be the best option. 395 * 396 * You can enable/disable/tune the pipelined operation mode by adjusting 397 * the compile time parameters below. 398 */ 399 400/* 401 * Possible improvements. 402 * 403 * 1. Support for the ATAPI overlap protocol. 404 * 405 * In order to maximize bus throughput, we currently use the DSC 406 * overlap method which enables ide.c to service requests from the 407 * other device while the tape is busy executing a command. The 408 * DSC overlap method involves polling the tape's status register 409 * for the DSC bit, and servicing the other device while the tape 410 * isn't ready. 411 * 412 * In the current QIC development standard (December 1995), 413 * it is recommended that new tape drives will *in addition* 414 * implement the ATAPI overlap protocol, which is used for the 415 * same purpose - efficient use of the IDE bus, but is interrupt 416 * driven and thus has much less CPU overhead. 417 * 418 * ATAPI overlap is likely to be supported in most new ATAPI 419 * devices, including new ATAPI cdroms, and thus provides us 420 * a method by which we can achieve higher throughput when 421 * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. 422 */ 423 424#define IDETAPE_VERSION "1.19" 425 426#include <linux/module.h> 427#include <linux/types.h> 428#include <linux/string.h> 429#include <linux/kernel.h> 430#include <linux/delay.h> 431#include <linux/timer.h> 432#include <linux/mm.h> 433#include <linux/interrupt.h> 434#include <linux/jiffies.h> 435#include <linux/major.h> 436#include <linux/errno.h> 437#include <linux/genhd.h> 438#include <linux/slab.h> 439#include <linux/pci.h> 440#include <linux/ide.h> 441#include <linux/smp_lock.h> 442#include <linux/completion.h> 443#include <linux/bitops.h> 444#include <linux/mutex.h> 445 446#include <asm/byteorder.h> 447#include <asm/irq.h> 448#include <asm/uaccess.h> 449#include <asm/io.h> 450#include <asm/unaligned.h> 451 452/* 453 * partition 454 */ 455typedef struct os_partition_s { 456 __u8 partition_num; 457 __u8 par_desc_ver; 458 __u16 wrt_pass_cntr; 459 __u32 first_frame_addr; 460 __u32 last_frame_addr; 461 __u32 eod_frame_addr; 462} os_partition_t; 463 464/* 465 * DAT entry 466 */ 467typedef struct os_dat_entry_s { 468 __u32 blk_sz; 469 __u16 blk_cnt; 470 __u8 flags; 471 __u8 reserved; 472} os_dat_entry_t; 473 474/* 475 * DAT 476 */ 477#define OS_DAT_FLAGS_DATA (0xc) 478#define OS_DAT_FLAGS_MARK (0x1) 479 480typedef struct os_dat_s { 481 __u8 dat_sz; 482 __u8 reserved1; 483 __u8 entry_cnt; 484 __u8 reserved3; 485 os_dat_entry_t dat_list[16]; 486} os_dat_t; 487 488#include <linux/mtio.h> 489 490/**************************** Tunable parameters *****************************/ 491 492 493/* 494 * Pipelined mode parameters. 495 * 496 * We try to use the minimum number of stages which is enough to 497 * keep the tape constantly streaming. To accomplish that, we implement 498 * a feedback loop around the maximum number of stages: 499 * 500 * We start from MIN maximum stages (we will not even use MIN stages 501 * if we don't need them), increment it by RATE*(MAX-MIN) 502 * whenever we sense that the pipeline is empty, until we reach 503 * the optimum value or until we reach MAX. 504 * 505 * Setting the following parameter to 0 is illegal: the pipelined mode 506 * cannot be disabled (calculate_speeds() divides by tape->max_stages.) 507 */ 508#define IDETAPE_MIN_PIPELINE_STAGES 1 509#define IDETAPE_MAX_PIPELINE_STAGES 400 510#define IDETAPE_INCREASE_STAGES_RATE 20 511 512/* 513 * The following are used to debug the driver: 514 * 515 * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. 516 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. 517 * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in 518 * some places. 519 * 520 * Setting them to 0 will restore normal operation mode: 521 * 522 * 1. Disable logging normal successful operations. 523 * 2. Disable self-sanity checks. 524 * 3. Errors will still be logged, of course. 525 * 526 * All the #if DEBUG code will be removed some day, when the driver 527 * is verified to be stable enough. This will make it much more 528 * esthetic. 529 */ 530#define IDETAPE_DEBUG_INFO 0 531#define IDETAPE_DEBUG_LOG 0 532#define IDETAPE_DEBUG_BUGS 1 533 534/* 535 * After each failed packet command we issue a request sense command 536 * and retry the packet command IDETAPE_MAX_PC_RETRIES times. 537 * 538 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 539 */ 540#define IDETAPE_MAX_PC_RETRIES 3 541 542/* 543 * With each packet command, we allocate a buffer of 544 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet 545 * commands (Not for READ/WRITE commands). 546 */ 547#define IDETAPE_PC_BUFFER_SIZE 256 548 549/* 550 * In various places in the driver, we need to allocate storage 551 * for packet commands and requests, which will remain valid while 552 * we leave the driver to wait for an interrupt or a timeout event. 553 */ 554#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) 555 556/* 557 * Some drives (for example, Seagate STT3401A Travan) require a very long 558 * timeout, because they don't return an interrupt or clear their busy bit 559 * until after the command completes (even retension commands). 560 */ 561#define IDETAPE_WAIT_CMD (900*HZ) 562 563/* 564 * The following parameter is used to select the point in the internal 565 * tape fifo in which we will start to refill the buffer. Decreasing 566 * the following parameter will improve the system's latency and 567 * interactive response, while using a high value might improve system 568 * throughput. 569 */ 570#define IDETAPE_FIFO_THRESHOLD 2 571 572/* 573 * DSC polling parameters. 574 * 575 * Polling for DSC (a single bit in the status register) is a very 576 * important function in ide-tape. There are two cases in which we 577 * poll for DSC: 578 * 579 * 1. Before a read/write packet command, to ensure that we 580 * can transfer data from/to the tape's data buffers, without 581 * causing an actual media access. In case the tape is not 582 * ready yet, we take out our request from the device 583 * request queue, so that ide.c will service requests from 584 * the other device on the same interface meanwhile. 585 * 586 * 2. After the successful initialization of a "media access 587 * packet command", which is a command which can take a long 588 * time to complete (it can be several seconds or even an hour). 589 * 590 * Again, we postpone our request in the middle to free the bus 591 * for the other device. The polling frequency here should be 592 * lower than the read/write frequency since those media access 593 * commands are slow. We start from a "fast" frequency - 594 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC 595 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a 596 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). 597 * 598 * We also set a timeout for the timer, in case something goes wrong. 599 * The timeout should be longer then the maximum execution time of a 600 * tape operation. 601 */ 602 603/* 604 * DSC timings. 605 */ 606#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 607#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 608#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 609#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 610#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 611#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 612#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 613 614/*************************** End of tunable parameters ***********************/ 615 616/* 617 * Read/Write error simulation 618 */ 619#define SIMULATE_ERRORS 0 620 621/* 622 * For general magnetic tape device compatibility. 623 */ 624typedef enum { 625 idetape_direction_none, 626 idetape_direction_read, 627 idetape_direction_write 628} idetape_chrdev_direction_t; 629 630struct idetape_bh { 631 u32 b_size; 632 atomic_t b_count; 633 struct idetape_bh *b_reqnext; 634 char *b_data; 635}; 636 637/* 638 * Our view of a packet command. 639 */ 640typedef struct idetape_packet_command_s { 641 u8 c[12]; /* Actual packet bytes */ 642 int retries; /* On each retry, we increment retries */ 643 int error; /* Error code */ 644 int request_transfer; /* Bytes to transfer */ 645 int actually_transferred; /* Bytes actually transferred */ 646 int buffer_size; /* Size of our data buffer */ 647 struct idetape_bh *bh; 648 char *b_data; 649 int b_count; 650 u8 *buffer; /* Data buffer */ 651 u8 *current_position; /* Pointer into the above buffer */ 652 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ 653 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ 654 unsigned long flags; /* Status/Action bit flags: long for set_bit */ 655} idetape_pc_t; 656 657/* 658 * Packet command flag bits. 659 */ 660/* Set when an error is considered normal - We won't retry */ 661#define PC_ABORT 0 662/* 1 When polling for DSC on a media access command */ 663#define PC_WAIT_FOR_DSC 1 664/* 1 when we prefer to use DMA if possible */ 665#define PC_DMA_RECOMMENDED 2 666/* 1 while DMA in progress */ 667#define PC_DMA_IN_PROGRESS 3 668/* 1 when encountered problem during DMA */ 669#define PC_DMA_ERROR 4 670/* Data direction */ 671#define PC_WRITING 5 672 673/* 674 * Capabilities and Mechanical Status Page 675 */ 676typedef struct { 677 unsigned page_code :6; /* Page code - Should be 0x2a */ 678 __u8 reserved0_6 :1; 679 __u8 ps :1; /* parameters saveable */ 680 __u8 page_length; /* Page Length - Should be 0x12 */ 681 __u8 reserved2, reserved3; 682 unsigned ro :1; /* Read Only Mode */ 683 unsigned reserved4_1234 :4; 684 unsigned sprev :1; /* Supports SPACE in the reverse direction */ 685 unsigned reserved4_67 :2; 686 unsigned reserved5_012 :3; 687 unsigned efmt :1; /* Supports ERASE command initiated formatting */ 688 unsigned reserved5_4 :1; 689 unsigned qfa :1; /* Supports the QFA two partition formats */ 690 unsigned reserved5_67 :2; 691 unsigned lock :1; /* Supports locking the volume */ 692 unsigned locked :1; /* The volume is locked */ 693 unsigned prevent :1; /* The device defaults in the prevent state after power up */ 694 unsigned eject :1; /* The device can eject the volume */ 695 __u8 disconnect :1; /* The device can break request > ctl */ 696 __u8 reserved6_5 :1; 697 unsigned ecc :1; /* Supports error correction */ 698 unsigned cmprs :1; /* Supports data compression */ 699 unsigned reserved7_0 :1; 700 unsigned blk512 :1; /* Supports 512 bytes block size */ 701 unsigned blk1024 :1; /* Supports 1024 bytes block size */ 702 unsigned reserved7_3_6 :4; 703 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ 704 /* transfers for slow buffer memory ??? */ 705 /* Also 32768 block size in some cases */ 706 __u16 max_speed; /* Maximum speed supported in KBps */ 707 __u8 reserved10, reserved11; 708 __u16 ctl; /* Continuous Transfer Limit in blocks */ 709 __u16 speed; /* Current Speed, in KBps */ 710 __u16 buffer_size; /* Buffer Size, in 512 bytes */ 711 __u8 reserved18, reserved19; 712} idetape_capabilities_page_t; 713 714/* 715 * Block Size Page 716 */ 717typedef struct { 718 unsigned page_code :6; /* Page code - Should be 0x30 */ 719 unsigned reserved1_6 :1; 720 unsigned ps :1; 721 __u8 page_length; /* Page Length - Should be 2 */ 722 __u8 reserved2; 723 unsigned play32 :1; 724 unsigned play32_5 :1; 725 unsigned reserved2_23 :2; 726 unsigned record32 :1; 727 unsigned record32_5 :1; 728 unsigned reserved2_6 :1; 729 unsigned one :1; 730} idetape_block_size_page_t; 731 732/* 733 * A pipeline stage. 734 */ 735typedef struct idetape_stage_s { 736 struct request rq; /* The corresponding request */ 737 struct idetape_bh *bh; /* The data buffers */ 738 struct idetape_stage_s *next; /* Pointer to the next stage */ 739} idetape_stage_t; 740 741/* 742 * REQUEST SENSE packet command result - Data Format. 743 */ 744typedef struct { 745 unsigned error_code :7; /* Current of deferred errors */ 746 unsigned valid :1; /* The information field conforms to QIC-157C */ 747 __u8 reserved1 :8; /* Segment Number - Reserved */ 748 unsigned sense_key :4; /* Sense Key */ 749 unsigned reserved2_4 :1; /* Reserved */ 750 unsigned ili :1; /* Incorrect Length Indicator */ 751 unsigned eom :1; /* End Of Medium */ 752 unsigned filemark :1; /* Filemark */ 753 __u32 information __attribute__ ((packed)); 754 __u8 asl; /* Additional sense length (n-7) */ 755 __u32 command_specific; /* Additional command specific information */ 756 __u8 asc; /* Additional Sense Code */ 757 __u8 ascq; /* Additional Sense Code Qualifier */ 758 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ 759 unsigned sk_specific1 :7; /* Sense Key Specific */ 760 unsigned sksv :1; /* Sense Key Specific information is valid */ 761 __u8 sk_specific2; /* Sense Key Specific */ 762 __u8 sk_specific3; /* Sense Key Specific */ 763 __u8 pad[2]; /* Padding to 20 bytes */ 764} idetape_request_sense_result_t; 765 766 767/* 768 * Most of our global data which we need to save even as we leave the 769 * driver due to an interrupt or a timer event is stored in a variable 770 * of type idetape_tape_t, defined below. 771 */ 772typedef struct ide_tape_obj { 773 ide_drive_t *drive; 774 ide_driver_t *driver; 775 struct gendisk *disk; 776 struct kref kref; 777 778 /* 779 * Since a typical character device operation requires more 780 * than one packet command, we provide here enough memory 781 * for the maximum of interconnected packet commands. 782 * The packet commands are stored in the circular array pc_stack. 783 * pc_stack_index points to the last used entry, and warps around 784 * to the start when we get to the last array entry. 785 * 786 * pc points to the current processed packet command. 787 * 788 * failed_pc points to the last failed packet command, or contains 789 * NULL if we do not need to retry any packet command. This is 790 * required since an additional packet command is needed before the 791 * retry, to get detailed information on what went wrong. 792 */ 793 /* Current packet command */ 794 idetape_pc_t *pc; 795 /* Last failed packet command */ 796 idetape_pc_t *failed_pc; 797 /* Packet command stack */ 798 idetape_pc_t pc_stack[IDETAPE_PC_STACK]; 799 /* Next free packet command storage space */ 800 int pc_stack_index; 801 struct request rq_stack[IDETAPE_PC_STACK]; 802 /* We implement a circular array */ 803 int rq_stack_index; 804 805 /* 806 * DSC polling variables. 807 * 808 * While polling for DSC we use postponed_rq to postpone the 809 * current request so that ide.c will be able to service 810 * pending requests on the other device. Note that at most 811 * we will have only one DSC (usually data transfer) request 812 * in the device request queue. Additional requests can be 813 * queued in our internal pipeline, but they will be visible 814 * to ide.c only one at a time. 815 */ 816 struct request *postponed_rq; 817 /* The time in which we started polling for DSC */ 818 unsigned long dsc_polling_start; 819 /* Timer used to poll for dsc */ 820 struct timer_list dsc_timer; 821 /* Read/Write dsc polling frequency */ 822 unsigned long best_dsc_rw_frequency; 823 /* The current polling frequency */ 824 unsigned long dsc_polling_frequency; 825 /* Maximum waiting time */ 826 unsigned long dsc_timeout; 827 828 /* 829 * Read position information 830 */ 831 u8 partition; 832 /* Current block */ 833 unsigned int first_frame_position; 834 unsigned int last_frame_position; 835 unsigned int blocks_in_buffer; 836 837 /* 838 * Last error information 839 */ 840 u8 sense_key, asc, ascq; 841 842 /* 843 * Character device operation 844 */ 845 unsigned int minor; 846 /* device name */ 847 char name[4]; 848 /* Current character device data transfer direction */ 849 idetape_chrdev_direction_t chrdev_direction; 850 851 /* 852 * Device information 853 */ 854 /* Usually 512 or 1024 bytes */ 855 unsigned short tape_block_size; 856 int user_bs_factor; 857 /* Copy of the tape's Capabilities and Mechanical Page */ 858 idetape_capabilities_page_t capabilities; 859 860 /* 861 * Active data transfer request parameters. 862 * 863 * At most, there is only one ide-tape originated data transfer 864 * request in the device request queue. This allows ide.c to 865 * easily service requests from the other device when we 866 * postpone our active request. In the pipelined operation 867 * mode, we use our internal pipeline structure to hold 868 * more data requests. 869 * 870 * The data buffer size is chosen based on the tape's 871 * recommendation. 872 */ 873 /* Pointer to the request which is waiting in the device request queue */ 874 struct request *active_data_request; 875 /* Data buffer size (chosen based on the tape's recommendation */ 876 int stage_size; 877 idetape_stage_t *merge_stage; 878 int merge_stage_size; 879 struct idetape_bh *bh; 880 char *b_data; 881 int b_count; 882 883 /* 884 * Pipeline parameters. 885 * 886 * To accomplish non-pipelined mode, we simply set the following 887 * variables to zero (or NULL, where appropriate). 888 */ 889 /* Number of currently used stages */ 890 int nr_stages; 891 /* Number of pending stages */ 892 int nr_pending_stages; 893 /* We will not allocate more than this number of stages */ 894 int max_stages, min_pipeline, max_pipeline; 895 /* The first stage which will be removed from the pipeline */ 896 idetape_stage_t *first_stage; 897 /* The currently active stage */ 898 idetape_stage_t *active_stage; 899 /* Will be serviced after the currently active request */ 900 idetape_stage_t *next_stage; 901 /* New requests will be added to the pipeline here */ 902 idetape_stage_t *last_stage; 903 /* Optional free stage which we can use */ 904 idetape_stage_t *cache_stage; 905 int pages_per_stage; 906 /* Wasted space in each stage */ 907 int excess_bh_size; 908 909 /* Status/Action flags: long for set_bit */ 910 unsigned long flags; 911 /* protects the ide-tape queue */ 912 spinlock_t spinlock; 913 914 /* 915 * Measures average tape speed 916 */ 917 unsigned long avg_time; 918 int avg_size; 919 int avg_speed; 920 921 /* last sense information */ 922 idetape_request_sense_result_t sense; 923 924 char vendor_id[10]; 925 char product_id[18]; 926 char firmware_revision[6]; 927 int firmware_revision_num; 928 929 /* the door is currently locked */ 930 int door_locked; 931 /* the tape hardware is write protected */ 932 char drv_write_prot; 933 /* the tape is write protected (hardware or opened as read-only) */ 934 char write_prot; 935 936 /* 937 * Limit the number of times a request can 938 * be postponed, to avoid an infinite postpone 939 * deadlock. 940 */ 941 /* request postpone count limit */ 942 int postpone_cnt; 943 944 /* 945 * Measures number of frames: 946 * 947 * 1. written/read to/from the driver pipeline (pipeline_head). 948 * 2. written/read to/from the tape buffers (idetape_bh). 949 * 3. written/read by the tape to/from the media (tape_head). 950 */ 951 int pipeline_head; 952 int buffer_head; 953 int tape_head; 954 int last_tape_head; 955 956 /* 957 * Speed control at the tape buffers input/output 958 */ 959 unsigned long insert_time; 960 int insert_size; 961 int insert_speed; 962 int max_insert_speed; 963 int measure_insert_time; 964 965 /* 966 * Measure tape still time, in milliseconds 967 */ 968 unsigned long tape_still_time_begin; 969 int tape_still_time; 970 971 /* 972 * Speed regulation negative feedback loop 973 */ 974 int speed_control; 975 int pipeline_head_speed; 976 int controlled_pipeline_head_speed; 977 int uncontrolled_pipeline_head_speed; 978 int controlled_last_pipeline_head; 979 int uncontrolled_last_pipeline_head; 980 unsigned long uncontrolled_pipeline_head_time; 981 unsigned long controlled_pipeline_head_time; 982 int controlled_previous_pipeline_head; 983 int uncontrolled_previous_pipeline_head; 984 unsigned long controlled_previous_head_time; 985 unsigned long uncontrolled_previous_head_time; 986 int restart_speed_control_req; 987 988 /* 989 * Debug_level determines amount of debugging output; 990 * can be changed using /proc/ide/hdx/settings 991 * 0 : almost no debugging output 992 * 1 : 0+output errors only 993 * 2 : 1+output all sensekey/asc 994 * 3 : 2+follow all chrdev related procedures 995 * 4 : 3+follow all procedures 996 * 5 : 4+include pc_stack rq_stack info 997 * 6 : 5+USE_COUNT updates 998 */ 999 int debug_level; 1000} idetape_tape_t; 1001 1002static DEFINE_MUTEX(idetape_ref_mutex); 1003 1004static struct class *idetape_sysfs_class; 1005 1006#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) 1007 1008#define ide_tape_g(disk) \ 1009 container_of((disk)->private_data, struct ide_tape_obj, driver) 1010 1011static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 1012{ 1013 struct ide_tape_obj *tape = NULL; 1014 1015 mutex_lock(&idetape_ref_mutex); 1016 tape = ide_tape_g(disk); 1017 if (tape) 1018 kref_get(&tape->kref); 1019 mutex_unlock(&idetape_ref_mutex); 1020 return tape; 1021} 1022 1023static void ide_tape_release(struct kref *); 1024 1025static void ide_tape_put(struct ide_tape_obj *tape) 1026{ 1027 mutex_lock(&idetape_ref_mutex); 1028 kref_put(&tape->kref, ide_tape_release); 1029 mutex_unlock(&idetape_ref_mutex); 1030} 1031 1032/* 1033 * Tape door status 1034 */ 1035#define DOOR_UNLOCKED 0 1036#define DOOR_LOCKED 1 1037#define DOOR_EXPLICITLY_LOCKED 2 1038 1039/* 1040 * Tape flag bits values. 1041 */ 1042#define IDETAPE_IGNORE_DSC 0 1043#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ 1044#define IDETAPE_BUSY 2 /* Device already opened */ 1045#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ 1046#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ 1047#define IDETAPE_FILEMARK 5 /* Currently on a filemark */ 1048#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ 1049#define IDETAPE_READ_ERROR 7 1050#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ 1051/* 0 = no tape is loaded, so we don't rewind after ejecting */ 1052#define IDETAPE_MEDIUM_PRESENT 9 1053 1054/* 1055 * Supported ATAPI tape drives packet commands 1056 */ 1057#define IDETAPE_TEST_UNIT_READY_CMD 0x00 1058#define IDETAPE_REWIND_CMD 0x01 1059#define IDETAPE_REQUEST_SENSE_CMD 0x03 1060#define IDETAPE_READ_CMD 0x08 1061#define IDETAPE_WRITE_CMD 0x0a 1062#define IDETAPE_WRITE_FILEMARK_CMD 0x10 1063#define IDETAPE_SPACE_CMD 0x11 1064#define IDETAPE_INQUIRY_CMD 0x12 1065#define IDETAPE_ERASE_CMD 0x19 1066#define IDETAPE_MODE_SENSE_CMD 0x1a 1067#define IDETAPE_MODE_SELECT_CMD 0x15 1068#define IDETAPE_LOAD_UNLOAD_CMD 0x1b 1069#define IDETAPE_PREVENT_CMD 0x1e 1070#define IDETAPE_LOCATE_CMD 0x2b 1071#define IDETAPE_READ_POSITION_CMD 0x34 1072#define IDETAPE_READ_BUFFER_CMD 0x3c 1073#define IDETAPE_SET_SPEED_CMD 0xbb 1074 1075/* 1076 * Some defines for the READ BUFFER command 1077 */ 1078#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 1079 1080/* 1081 * Some defines for the SPACE command 1082 */ 1083#define IDETAPE_SPACE_OVER_FILEMARK 1 1084#define IDETAPE_SPACE_TO_EOD 3 1085 1086/* 1087 * Some defines for the LOAD UNLOAD command 1088 */ 1089#define IDETAPE_LU_LOAD_MASK 1 1090#define IDETAPE_LU_RETENSION_MASK 2 1091#define IDETAPE_LU_EOT_MASK 4 1092 1093/* 1094 * Special requests for our block device strategy routine. 1095 * 1096 * In order to service a character device command, we add special 1097 * requests to the tail of our block device request queue and wait 1098 * for their completion. 1099 */ 1100 1101enum { 1102 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ 1103 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ 1104 REQ_IDETAPE_READ = (1 << 2), 1105 REQ_IDETAPE_WRITE = (1 << 3), 1106 REQ_IDETAPE_READ_BUFFER = (1 << 4), 1107}; 1108 1109/* 1110 * Error codes which are returned in rq->errors to the higher part 1111 * of the driver. 1112 */ 1113#define IDETAPE_ERROR_GENERAL 101 1114#define IDETAPE_ERROR_FILEMARK 102 1115#define IDETAPE_ERROR_EOD 103 1116 1117/* 1118 * The following is used to format the general configuration word of 1119 * the ATAPI IDENTIFY DEVICE command. 1120 */ 1121struct idetape_id_gcw { 1122 unsigned packet_size :2; /* Packet Size */ 1123 unsigned reserved234 :3; /* Reserved */ 1124 unsigned drq_type :2; /* Command packet DRQ type */ 1125 unsigned removable :1; /* Removable media */ 1126 unsigned device_type :5; /* Device type */ 1127 unsigned reserved13 :1; /* Reserved */ 1128 unsigned protocol :2; /* Protocol type */ 1129}; 1130 1131/* 1132 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) 1133 */ 1134typedef struct { 1135 unsigned device_type :5; /* Peripheral Device Type */ 1136 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ 1137 unsigned reserved1_6t0 :7; /* Reserved */ 1138 unsigned rmb :1; /* Removable Medium Bit */ 1139 unsigned ansi_version :3; /* ANSI Version */ 1140 unsigned ecma_version :3; /* ECMA Version */ 1141 unsigned iso_version :2; /* ISO Version */ 1142 unsigned response_format :4; /* Response Data Format */ 1143 unsigned reserved3_45 :2; /* Reserved */ 1144 unsigned reserved3_6 :1; /* TrmIOP - Reserved */ 1145 unsigned reserved3_7 :1; /* AENC - Reserved */ 1146 __u8 additional_length; /* Additional Length (total_length-4) */ 1147 __u8 rsv5, rsv6, rsv7; /* Reserved */ 1148 __u8 vendor_id[8]; /* Vendor Identification */ 1149 __u8 product_id[16]; /* Product Identification */ 1150 __u8 revision_level[4]; /* Revision Level */ 1151 __u8 vendor_specific[20]; /* Vendor Specific - Optional */ 1152 __u8 reserved56t95[40]; /* Reserved - Optional */ 1153 /* Additional information may be returned */ 1154} idetape_inquiry_result_t; 1155 1156/* 1157 * READ POSITION packet command - Data Format (From Table 6-57) 1158 */ 1159typedef struct { 1160 unsigned reserved0_10 :2; /* Reserved */ 1161 unsigned bpu :1; /* Block Position Unknown */ 1162 unsigned reserved0_543 :3; /* Reserved */ 1163 unsigned eop :1; /* End Of Partition */ 1164 unsigned bop :1; /* Beginning Of Partition */ 1165 u8 partition; /* Partition Number */ 1166 u8 reserved2, reserved3; /* Reserved */ 1167 u32 first_block; /* First Block Location */ 1168 u32 last_block; /* Last Block Location (Optional) */ 1169 u8 reserved12; /* Reserved */ 1170 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ 1171 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ 1172} idetape_read_position_result_t; 1173 1174/* 1175 * Follows structures which are related to the SELECT SENSE / MODE SENSE 1176 * packet commands. Those packet commands are still not supported 1177 * by ide-tape. 1178 */ 1179#define IDETAPE_BLOCK_DESCRIPTOR 0 1180#define IDETAPE_CAPABILITIES_PAGE 0x2a 1181#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ 1182#define IDETAPE_BLOCK_SIZE_PAGE 0x30 1183#define IDETAPE_BUFFER_FILLING_PAGE 0x33 1184 1185/* 1186 * Mode Parameter Header for the MODE SENSE packet command 1187 */ 1188typedef struct { 1189 __u8 mode_data_length; /* Length of the following data transfer */ 1190 __u8 medium_type; /* Medium Type */ 1191 __u8 dsp; /* Device Specific Parameter */ 1192 __u8 bdl; /* Block Descriptor Length */ 1193#if 0 1194 /* data transfer page */ 1195 __u8 page_code :6; 1196 __u8 reserved0_6 :1; 1197 __u8 ps :1; /* parameters saveable */ 1198 __u8 page_length; /* page Length == 0x02 */ 1199 __u8 reserved2; 1200 __u8 read32k :1; /* 32k blk size (data only) */ 1201 __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */ 1202 __u8 reserved3_23 :2; 1203 __u8 write32k :1; /* 32k blk size (data only) */ 1204 __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */ 1205 __u8 reserved3_6 :1; 1206 __u8 streaming :1; /* streaming mode enable */ 1207#endif 1208} idetape_mode_parameter_header_t; 1209 1210/* 1211 * Mode Parameter Block Descriptor the MODE SENSE packet command 1212 * 1213 * Support for block descriptors is optional. 1214 */ 1215typedef struct { 1216 __u8 density_code; /* Medium density code */ 1217 __u8 blocks[3]; /* Number of blocks */ 1218 __u8 reserved4; /* Reserved */ 1219 __u8 length[3]; /* Block Length */ 1220} idetape_parameter_block_descriptor_t; 1221 1222/* 1223 * The Data Compression Page, as returned by the MODE SENSE packet command. 1224 */ 1225typedef struct { 1226 unsigned page_code :6; /* Page Code - Should be 0xf */ 1227 unsigned reserved0 :1; /* Reserved */ 1228 unsigned ps :1; 1229 __u8 page_length; /* Page Length - Should be 14 */ 1230 unsigned reserved2 :6; /* Reserved */ 1231 unsigned dcc :1; /* Data Compression Capable */ 1232 unsigned dce :1; /* Data Compression Enable */ 1233 unsigned reserved3 :5; /* Reserved */ 1234 unsigned red :2; /* Report Exception on Decompression */ 1235 unsigned dde :1; /* Data Decompression Enable */ 1236 __u32 ca; /* Compression Algorithm */ 1237 __u32 da; /* Decompression Algorithm */ 1238 __u8 reserved[4]; /* Reserved */ 1239} idetape_data_compression_page_t; 1240 1241/* 1242 * The Medium Partition Page, as returned by the MODE SENSE packet command. 1243 */ 1244typedef struct { 1245 unsigned page_code :6; /* Page Code - Should be 0x11 */ 1246 unsigned reserved1_6 :1; /* Reserved */ 1247 unsigned ps :1; 1248 __u8 page_length; /* Page Length - Should be 6 */ 1249 __u8 map; /* Maximum Additional Partitions - Should be 0 */ 1250 __u8 apd; /* Additional Partitions Defined - Should be 0 */ 1251 unsigned reserved4_012 :3; /* Reserved */ 1252 unsigned psum :2; /* Should be 0 */ 1253 unsigned idp :1; /* Should be 0 */ 1254 unsigned sdp :1; /* Should be 0 */ 1255 unsigned fdp :1; /* Fixed Data Partitions */ 1256 __u8 mfr; /* Medium Format Recognition */ 1257 __u8 reserved[2]; /* Reserved */ 1258} idetape_medium_partition_page_t; 1259 1260/* 1261 * Run time configurable parameters. 1262 */ 1263typedef struct { 1264 int dsc_rw_frequency; 1265 int dsc_media_access_frequency; 1266 int nr_stages; 1267} idetape_config_t; 1268 1269/* 1270 * The variables below are used for the character device interface. 1271 * Additional state variables are defined in our ide_drive_t structure. 1272 */ 1273static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; 1274 1275#define ide_tape_f(file) ((file)->private_data) 1276 1277static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 1278{ 1279 struct ide_tape_obj *tape = NULL; 1280 1281 mutex_lock(&idetape_ref_mutex); 1282 tape = idetape_devs[i]; 1283 if (tape) 1284 kref_get(&tape->kref); 1285 mutex_unlock(&idetape_ref_mutex); 1286 return tape; 1287} 1288 1289/* 1290 * Function declarations 1291 * 1292 */ 1293static int idetape_chrdev_release (struct inode *inode, struct file *filp); 1294static void idetape_write_release (ide_drive_t *drive, unsigned int minor); 1295 1296/* 1297 * Too bad. The drive wants to send us data which we are not ready to accept. 1298 * Just throw it away. 1299 */ 1300static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) 1301{ 1302 while (bcount--) 1303 (void) HWIF(drive)->INB(IDE_DATA_REG); 1304} 1305 1306static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 1307{ 1308 struct idetape_bh *bh = pc->bh; 1309 int count; 1310 1311 while (bcount) { 1312#if IDETAPE_DEBUG_BUGS 1313 if (bh == NULL) { 1314 printk(KERN_ERR "ide-tape: bh == NULL in " 1315 "idetape_input_buffers\n"); 1316 idetape_discard_data(drive, bcount); 1317 return; 1318 } 1319#endif /* IDETAPE_DEBUG_BUGS */ 1320 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); 1321 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); 1322 bcount -= count; 1323 atomic_add(count, &bh->b_count); 1324 if (atomic_read(&bh->b_count) == bh->b_size) { 1325 bh = bh->b_reqnext; 1326 if (bh) 1327 atomic_set(&bh->b_count, 0); 1328 } 1329 } 1330 pc->bh = bh; 1331} 1332 1333static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 1334{ 1335 struct idetape_bh *bh = pc->bh; 1336 int count; 1337 1338 while (bcount) { 1339#if IDETAPE_DEBUG_BUGS 1340 if (bh == NULL) { 1341 printk(KERN_ERR "ide-tape: bh == NULL in " 1342 "idetape_output_buffers\n"); 1343 return; 1344 } 1345#endif /* IDETAPE_DEBUG_BUGS */ 1346 count = min((unsigned int)pc->b_count, (unsigned int)bcount); 1347 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); 1348 bcount -= count; 1349 pc->b_data += count; 1350 pc->b_count -= count; 1351 if (!pc->b_count) { 1352 pc->bh = bh = bh->b_reqnext; 1353 if (bh) { 1354 pc->b_data = bh->b_data; 1355 pc->b_count = atomic_read(&bh->b_count); 1356 } 1357 } 1358 } 1359} 1360 1361static void idetape_update_buffers (idetape_pc_t *pc) 1362{ 1363 struct idetape_bh *bh = pc->bh; 1364 int count; 1365 unsigned int bcount = pc->actually_transferred; 1366 1367 if (test_bit(PC_WRITING, &pc->flags)) 1368 return; 1369 while (bcount) { 1370#if IDETAPE_DEBUG_BUGS 1371 if (bh == NULL) { 1372 printk(KERN_ERR "ide-tape: bh == NULL in " 1373 "idetape_update_buffers\n"); 1374 return; 1375 } 1376#endif /* IDETAPE_DEBUG_BUGS */ 1377 count = min((unsigned int)bh->b_size, (unsigned int)bcount); 1378 atomic_set(&bh->b_count, count); 1379 if (atomic_read(&bh->b_count) == bh->b_size) 1380 bh = bh->b_reqnext; 1381 bcount -= count; 1382 } 1383 pc->bh = bh; 1384} 1385 1386/* 1387 * idetape_next_pc_storage returns a pointer to a place in which we can 1388 * safely store a packet command, even though we intend to leave the 1389 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet 1390 * commands is allocated at initialization time. 1391 */ 1392static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) 1393{ 1394 idetape_tape_t *tape = drive->driver_data; 1395 1396#if IDETAPE_DEBUG_LOG 1397 if (tape->debug_level >= 5) 1398 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", 1399 tape->pc_stack_index); 1400#endif /* IDETAPE_DEBUG_LOG */ 1401 if (tape->pc_stack_index == IDETAPE_PC_STACK) 1402 tape->pc_stack_index=0; 1403 return (&tape->pc_stack[tape->pc_stack_index++]); 1404} 1405 1406/* 1407 * idetape_next_rq_storage is used along with idetape_next_pc_storage. 1408 * Since we queue packet commands in the request queue, we need to 1409 * allocate a request, along with the allocation of a packet command. 1410 */ 1411 1412/************************************************************** 1413 * * 1414 * This should get fixed to use kmalloc(.., GFP_ATOMIC) * 1415 * followed later on by kfree(). -ml * 1416 * * 1417 **************************************************************/ 1418 1419static struct request *idetape_next_rq_storage (ide_drive_t *drive) 1420{ 1421 idetape_tape_t *tape = drive->driver_data; 1422 1423#if IDETAPE_DEBUG_LOG 1424 if (tape->debug_level >= 5) 1425 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", 1426 tape->rq_stack_index); 1427#endif /* IDETAPE_DEBUG_LOG */ 1428 if (tape->rq_stack_index == IDETAPE_PC_STACK) 1429 tape->rq_stack_index=0; 1430 return (&tape->rq_stack[tape->rq_stack_index++]); 1431} 1432 1433/* 1434 * idetape_init_pc initializes a packet command. 1435 */ 1436static void idetape_init_pc (idetape_pc_t *pc) 1437{ 1438 memset(pc->c, 0, 12); 1439 pc->retries = 0; 1440 pc->flags = 0; 1441 pc->request_transfer = 0; 1442 pc->buffer = pc->pc_buffer; 1443 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; 1444 pc->bh = NULL; 1445 pc->b_data = NULL; 1446} 1447 1448/* 1449 * idetape_analyze_error is called on each failed packet command retry 1450 * to analyze the request sense. We currently do not utilize this 1451 * information. 1452 */ 1453static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) 1454{ 1455 idetape_tape_t *tape = drive->driver_data; 1456 idetape_pc_t *pc = tape->failed_pc; 1457 1458 tape->sense = *result; 1459 tape->sense_key = result->sense_key; 1460 tape->asc = result->asc; 1461 tape->ascq = result->ascq; 1462#if IDETAPE_DEBUG_LOG 1463 /* 1464 * Without debugging, we only log an error if we decided to 1465 * give up retrying. 1466 */ 1467 if (tape->debug_level >= 1) 1468 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " 1469 "asc = %x, ascq = %x\n", 1470 pc->c[0], result->sense_key, 1471 result->asc, result->ascq); 1472#endif /* IDETAPE_DEBUG_LOG */ 1473 1474 /* 1475 * Correct pc->actually_transferred by asking the tape. 1476 */ 1477 if (test_bit(PC_DMA_ERROR, &pc->flags)) { 1478 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information)); 1479 idetape_update_buffers(pc); 1480 } 1481 1482 /* 1483 * If error was the result of a zero-length read or write command, 1484 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 1485 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 1486 */ 1487 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) 1488 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */ 1489 if (result->sense_key == 5) { 1490 /* don't report an error, everything's ok */ 1491 pc->error = 0; 1492 /* don't retry read/write */ 1493 set_bit(PC_ABORT, &pc->flags); 1494 } 1495 } 1496 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { 1497 pc->error = IDETAPE_ERROR_FILEMARK; 1498 set_bit(PC_ABORT, &pc->flags); 1499 } 1500 if (pc->c[0] == IDETAPE_WRITE_CMD) { 1501 if (result->eom || 1502 (result->sense_key == 0xd && result->asc == 0x0 && 1503 result->ascq == 0x2)) { 1504 pc->error = IDETAPE_ERROR_EOD; 1505 set_bit(PC_ABORT, &pc->flags); 1506 } 1507 } 1508 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { 1509 if (result->sense_key == 8) { 1510 pc->error = IDETAPE_ERROR_EOD; 1511 set_bit(PC_ABORT, &pc->flags); 1512 } 1513 if (!test_bit(PC_ABORT, &pc->flags) && 1514 pc->actually_transferred) 1515 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 1516 } 1517} 1518 1519/* 1520 * idetape_active_next_stage will declare the next stage as "active". 1521 */ 1522static void idetape_active_next_stage (ide_drive_t *drive) 1523{ 1524 idetape_tape_t *tape = drive->driver_data; 1525 idetape_stage_t *stage = tape->next_stage; 1526 struct request *rq = &stage->rq; 1527 1528#if IDETAPE_DEBUG_LOG 1529 if (tape->debug_level >= 4) 1530 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); 1531#endif /* IDETAPE_DEBUG_LOG */ 1532#if IDETAPE_DEBUG_BUGS 1533 if (stage == NULL) { 1534 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); 1535 return; 1536 } 1537#endif /* IDETAPE_DEBUG_BUGS */ 1538 1539 rq->rq_disk = tape->disk; 1540 rq->buffer = NULL; 1541 rq->special = (void *)stage->bh; 1542 tape->active_data_request = rq; 1543 tape->active_stage = stage; 1544 tape->next_stage = stage->next; 1545} 1546 1547/* 1548 * idetape_increase_max_pipeline_stages is a part of the feedback 1549 * loop which tries to find the optimum number of stages. In the 1550 * feedback loop, we are starting from a minimum maximum number of 1551 * stages, and if we sense that the pipeline is empty, we try to 1552 * increase it, until we reach the user compile time memory limit. 1553 */ 1554static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) 1555{ 1556 idetape_tape_t *tape = drive->driver_data; 1557 int increase = (tape->max_pipeline - tape->min_pipeline) / 10; 1558 1559#if IDETAPE_DEBUG_LOG 1560 if (tape->debug_level >= 4) 1561 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); 1562#endif /* IDETAPE_DEBUG_LOG */ 1563 1564 tape->max_stages += max(increase, 1); 1565 tape->max_stages = max(tape->max_stages, tape->min_pipeline); 1566 tape->max_stages = min(tape->max_stages, tape->max_pipeline); 1567} 1568 1569/* 1570 * idetape_kfree_stage calls kfree to completely free a stage, along with 1571 * its related buffers. 1572 */ 1573static void __idetape_kfree_stage (idetape_stage_t *stage) 1574{ 1575 struct idetape_bh *prev_bh, *bh = stage->bh; 1576 int size; 1577 1578 while (bh != NULL) { 1579 if (bh->b_data != NULL) { 1580 size = (int) bh->b_size; 1581 while (size > 0) { 1582 free_page((unsigned long) bh->b_data); 1583 size -= PAGE_SIZE; 1584 bh->b_data += PAGE_SIZE; 1585 } 1586 } 1587 prev_bh = bh; 1588 bh = bh->b_reqnext; 1589 kfree(prev_bh); 1590 } 1591 kfree(stage); 1592} 1593 1594static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) 1595{ 1596 __idetape_kfree_stage(stage); 1597} 1598 1599/* 1600 * idetape_remove_stage_head removes tape->first_stage from the pipeline. 1601 * The caller should avoid race conditions. 1602 */ 1603static void idetape_remove_stage_head (ide_drive_t *drive) 1604{ 1605 idetape_tape_t *tape = drive->driver_data; 1606 idetape_stage_t *stage; 1607 1608#if IDETAPE_DEBUG_LOG 1609 if (tape->debug_level >= 4) 1610 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); 1611#endif /* IDETAPE_DEBUG_LOG */ 1612#if IDETAPE_DEBUG_BUGS 1613 if (tape->first_stage == NULL) { 1614 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); 1615 return; 1616 } 1617 if (tape->active_stage == tape->first_stage) { 1618 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); 1619 return; 1620 } 1621#endif /* IDETAPE_DEBUG_BUGS */ 1622 stage = tape->first_stage; 1623 tape->first_stage = stage->next; 1624 idetape_kfree_stage(tape, stage); 1625 tape->nr_stages--; 1626 if (tape->first_stage == NULL) { 1627 tape->last_stage = NULL; 1628#if IDETAPE_DEBUG_BUGS 1629 if (tape->next_stage != NULL) 1630 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); 1631 if (tape->nr_stages) 1632 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); 1633#endif /* IDETAPE_DEBUG_BUGS */ 1634 } 1635} 1636 1637/* 1638 * This will free all the pipeline stages starting from new_last_stage->next 1639 * to the end of the list, and point tape->last_stage to new_last_stage. 1640 */ 1641static void idetape_abort_pipeline(ide_drive_t *drive, 1642 idetape_stage_t *new_last_stage) 1643{ 1644 idetape_tape_t *tape = drive->driver_data; 1645 idetape_stage_t *stage = new_last_stage->next; 1646 idetape_stage_t *nstage; 1647 1648#if IDETAPE_DEBUG_LOG 1649 if (tape->debug_level >= 4) 1650 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); 1651#endif 1652 while (stage) { 1653 nstage = stage->next; 1654 idetape_kfree_stage(tape, stage); 1655 --tape->nr_stages; 1656 --tape->nr_pending_stages; 1657 stage = nstage; 1658 } 1659 if (new_last_stage) 1660 new_last_stage->next = NULL; 1661 tape->last_stage = new_last_stage; 1662 tape->next_stage = NULL; 1663} 1664 1665/* 1666 * idetape_end_request is used to finish servicing a request, and to 1667 * insert a pending pipeline request into the main device queue. 1668 */ 1669static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) 1670{ 1671 struct request *rq = HWGROUP(drive)->rq; 1672 idetape_tape_t *tape = drive->driver_data; 1673 unsigned long flags; 1674 int error; 1675 int remove_stage = 0; 1676 idetape_stage_t *active_stage; 1677 1678#if IDETAPE_DEBUG_LOG 1679 if (tape->debug_level >= 4) 1680 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); 1681#endif /* IDETAPE_DEBUG_LOG */ 1682 1683 switch (uptodate) { 1684 case 0: error = IDETAPE_ERROR_GENERAL; break; 1685 case 1: error = 0; break; 1686 default: error = uptodate; 1687 } 1688 rq->errors = error; 1689 if (error) 1690 tape->failed_pc = NULL; 1691 1692 if (!blk_special_request(rq)) { 1693 ide_end_request(drive, uptodate, nr_sects); 1694 return 0; 1695 } 1696 1697 spin_lock_irqsave(&tape->spinlock, flags); 1698 1699 /* The request was a pipelined data transfer request */ 1700 if (tape->active_data_request == rq) { 1701 active_stage = tape->active_stage; 1702 tape->active_stage = NULL; 1703 tape->active_data_request = NULL; 1704 tape->nr_pending_stages--; 1705 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 1706 remove_stage = 1; 1707 if (error) { 1708 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1709 if (error == IDETAPE_ERROR_EOD) 1710 idetape_abort_pipeline(drive, active_stage); 1711 } 1712 } else if (rq->cmd[0] & REQ_IDETAPE_READ) { 1713 if (error == IDETAPE_ERROR_EOD) { 1714 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1715 idetape_abort_pipeline(drive, active_stage); 1716 } 1717 } 1718 if (tape->next_stage != NULL) { 1719 idetape_active_next_stage(drive); 1720 1721 /* 1722 * Insert the next request into the request queue. 1723 */ 1724 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 1725 } else if (!error) { 1726 idetape_increase_max_pipeline_stages(drive); 1727 } 1728 } 1729 ide_end_drive_cmd(drive, 0, 0); 1730// blkdev_dequeue_request(rq); 1731// drive->rq = NULL; 1732// end_that_request_last(rq); 1733 1734 if (remove_stage) 1735 idetape_remove_stage_head(drive); 1736 if (tape->active_data_request == NULL) 1737 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 1738 spin_unlock_irqrestore(&tape->spinlock, flags); 1739 return 0; 1740} 1741 1742static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) 1743{ 1744 idetape_tape_t *tape = drive->driver_data; 1745 1746#if IDETAPE_DEBUG_LOG 1747 if (tape->debug_level >= 4) 1748 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); 1749#endif /* IDETAPE_DEBUG_LOG */ 1750 if (!tape->pc->error) { 1751 idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer); 1752 idetape_end_request(drive, 1, 0); 1753 } else { 1754 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); 1755 idetape_end_request(drive, 0, 0); 1756 } 1757 return ide_stopped; 1758} 1759 1760static void idetape_create_request_sense_cmd (idetape_pc_t *pc) 1761{ 1762 idetape_init_pc(pc); 1763 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; 1764 pc->c[4] = 20; 1765 pc->request_transfer = 20; 1766 pc->callback = &idetape_request_sense_callback; 1767} 1768 1769static void idetape_init_rq(struct request *rq, u8 cmd) 1770{ 1771 memset(rq, 0, sizeof(*rq)); 1772 rq->cmd_type = REQ_TYPE_SPECIAL; 1773 rq->cmd[0] = cmd; 1774} 1775 1776/* 1777 * idetape_queue_pc_head generates a new packet command request in front 1778 * of the request queue, before the current request, so that it will be 1779 * processed immediately, on the next pass through the driver. 1780 * 1781 * idetape_queue_pc_head is called from the request handling part of 1782 * the driver (the "bottom" part). Safe storage for the request should 1783 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage 1784 * before calling idetape_queue_pc_head. 1785 * 1786 * Memory for those requests is pre-allocated at initialization time, and 1787 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough 1788 * space for the maximum possible number of inter-dependent packet commands. 1789 * 1790 * The higher level of the driver - The ioctl handler and the character 1791 * device handling functions should queue request to the lower level part 1792 * and wait for their completion using idetape_queue_pc_tail or 1793 * idetape_queue_rw_tail. 1794 */ 1795static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) 1796{ 1797 struct ide_tape_obj *tape = drive->driver_data; 1798 1799 idetape_init_rq(rq, REQ_IDETAPE_PC1); 1800 rq->buffer = (char *) pc; 1801 rq->rq_disk = tape->disk; 1802 (void) ide_do_drive_cmd(drive, rq, ide_preempt); 1803} 1804 1805/* 1806 * idetape_retry_pc is called when an error was detected during the 1807 * last packet command. We queue a request sense packet command in 1808 * the head of the request list. 1809 */ 1810static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) 1811{ 1812 idetape_tape_t *tape = drive->driver_data; 1813 idetape_pc_t *pc; 1814 struct request *rq; 1815 1816 (void)drive->hwif->INB(IDE_ERROR_REG); 1817 pc = idetape_next_pc_storage(drive); 1818 rq = idetape_next_rq_storage(drive); 1819 idetape_create_request_sense_cmd(pc); 1820 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 1821 idetape_queue_pc_head(drive, pc, rq); 1822 return ide_stopped; 1823} 1824 1825/* 1826 * idetape_postpone_request postpones the current request so that 1827 * ide.c will be able to service requests from another device on 1828 * the same hwgroup while we are polling for DSC. 1829 */ 1830static void idetape_postpone_request (ide_drive_t *drive) 1831{ 1832 idetape_tape_t *tape = drive->driver_data; 1833 1834#if IDETAPE_DEBUG_LOG 1835 if (tape->debug_level >= 4) 1836 printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); 1837#endif 1838 tape->postponed_rq = HWGROUP(drive)->rq; 1839 ide_stall_queue(drive, tape->dsc_polling_frequency); 1840} 1841 1842/* 1843 * idetape_pc_intr is the usual interrupt handler which will be called 1844 * during a packet command. We will transfer some of the data (as 1845 * requested by the drive) and will re-point interrupt handler to us. 1846 * When data transfer is finished, we will act according to the 1847 * algorithm described before idetape_issue_packet_command. 1848 * 1849 */ 1850static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) 1851{ 1852 ide_hwif_t *hwif = drive->hwif; 1853 idetape_tape_t *tape = drive->driver_data; 1854 idetape_pc_t *pc = tape->pc; 1855 unsigned int temp; 1856#if SIMULATE_ERRORS 1857 static int error_sim_count = 0; 1858#endif 1859 u16 bcount; 1860 u8 stat, ireason; 1861 1862#if IDETAPE_DEBUG_LOG 1863 if (tape->debug_level >= 4) 1864 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " 1865 "interrupt handler\n"); 1866#endif /* IDETAPE_DEBUG_LOG */ 1867 1868 /* Clear the interrupt */ 1869 stat = hwif->INB(IDE_STATUS_REG); 1870 1871 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1872 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) { 1873 /* 1874 * A DMA error is sometimes expected. For example, 1875 * if the tape is crossing a filemark during a 1876 * READ command, it will issue an irq and position 1877 * itself before the filemark, so that only a partial 1878 * data transfer will occur (which causes the DMA 1879 * error). In that case, we will later ask the tape 1880 * how much bytes of the original request were 1881 * actually transferred (we can't receive that 1882 * information from the DMA engine on most chipsets). 1883 */ 1884 1885 /* 1886 * On the contrary, a DMA error is never expected; 1887 * it usually indicates a hardware error or abort. 1888 * If the tape crosses a filemark during a READ 1889 * command, it will issue an irq and position itself 1890 * after the filemark (not before). Only a partial 1891 * data transfer will occur, but no DMA error. 1892 * (AS, 19 Apr 2001) 1893 */ 1894 set_bit(PC_DMA_ERROR, &pc->flags); 1895 } else { 1896 pc->actually_transferred = pc->request_transfer; 1897 idetape_update_buffers(pc); 1898 } 1899#if IDETAPE_DEBUG_LOG 1900 if (tape->debug_level >= 4) 1901 printk(KERN_INFO "ide-tape: DMA finished\n"); 1902#endif /* IDETAPE_DEBUG_LOG */ 1903 } 1904 1905 /* No more interrupts */ 1906 if ((stat & DRQ_STAT) == 0) { 1907#if IDETAPE_DEBUG_LOG 1908 if (tape->debug_level >= 2) 1909 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); 1910#endif /* IDETAPE_DEBUG_LOG */ 1911 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); 1912 1913 local_irq_enable(); 1914 1915#if SIMULATE_ERRORS 1916 if ((pc->c[0] == IDETAPE_WRITE_CMD || 1917 pc->c[0] == IDETAPE_READ_CMD) && 1918 (++error_sim_count % 100) == 0) { 1919 printk(KERN_INFO "ide-tape: %s: simulating error\n", 1920 tape->name); 1921 stat |= ERR_STAT; 1922 } 1923#endif 1924 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) 1925 stat &= ~ERR_STAT; 1926 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) { 1927 /* Error detected */ 1928#if IDETAPE_DEBUG_LOG 1929 if (tape->debug_level >= 1) 1930 printk(KERN_INFO "ide-tape: %s: I/O error\n", 1931 tape->name); 1932#endif /* IDETAPE_DEBUG_LOG */ 1933 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1934 printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); 1935 return ide_do_reset(drive); 1936 } 1937#if IDETAPE_DEBUG_LOG 1938 if (tape->debug_level >= 1) 1939 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); 1940#endif 1941 /* Retry operation */ 1942 return idetape_retry_pc(drive); 1943 } 1944 pc->error = 0; 1945 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && 1946 (stat & SEEK_STAT) == 0) { 1947 /* Media access command */ 1948 tape->dsc_polling_start = jiffies; 1949 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; 1950 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 1951 /* Allow ide.c to handle other requests */ 1952 idetape_postpone_request(drive); 1953 return ide_stopped; 1954 } 1955 if (tape->failed_pc == pc) 1956 tape->failed_pc = NULL; 1957 /* Command finished - Call the callback function */ 1958 return pc->callback(drive); 1959 } 1960 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1961 printk(KERN_ERR "ide-tape: The tape wants to issue more " 1962 "interrupts in DMA mode\n"); 1963 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); 1964 ide_dma_off(drive); 1965 return ide_do_reset(drive); 1966 } 1967 /* Get the number of bytes to transfer on this interrupt. */ 1968 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | 1969 hwif->INB(IDE_BCOUNTL_REG); 1970 1971 ireason = hwif->INB(IDE_IREASON_REG); 1972 1973 if (ireason & CD) { 1974 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); 1975 return ide_do_reset(drive); 1976 } 1977 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) { 1978 /* Hopefully, we will never get here */ 1979 printk(KERN_ERR "ide-tape: We wanted to %s, ", 1980 (ireason & IO) ? "Write" : "Read"); 1981 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", 1982 (ireason & IO) ? "Read" : "Write"); 1983 return ide_do_reset(drive); 1984 } 1985 if (!test_bit(PC_WRITING, &pc->flags)) { 1986 /* Reading - Check that we have enough space */ 1987 temp = pc->actually_transferred + bcount; 1988 if (temp > pc->request_transfer) { 1989 if (temp > pc->buffer_size) { 1990 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); 1991 idetape_discard_data(drive, bcount); 1992 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1993 return ide_started; 1994 } 1995#if IDETAPE_DEBUG_LOG 1996 if (tape->debug_level >= 2) 1997 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); 1998#endif /* IDETAPE_DEBUG_LOG */ 1999 } 2000 } 2001 if (test_bit(PC_WRITING, &pc->flags)) { 2002 if (pc->bh != NULL) 2003 idetape_output_buffers(drive, pc, bcount); 2004 else 2005 /* Write the current buffer */ 2006 hwif->atapi_output_bytes(drive, pc->current_position, 2007 bcount); 2008 } else { 2009 if (pc->bh != NULL) 2010 idetape_input_buffers(drive, pc, bcount); 2011 else 2012 /* Read the current buffer */ 2013 hwif->atapi_input_bytes(drive, pc->current_position, 2014 bcount); 2015 } 2016 /* Update the current position */ 2017 pc->actually_transferred += bcount; 2018 pc->current_position += bcount; 2019#if IDETAPE_DEBUG_LOG 2020 if (tape->debug_level >= 2) 2021 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes " 2022 "on that interrupt\n", pc->c[0], bcount); 2023#endif 2024 /* And set the interrupt handler again */ 2025 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 2026 return ide_started; 2027} 2028 2029/* 2030 * Packet Command Interface 2031 * 2032 * The current Packet Command is available in tape->pc, and will not 2033 * change until we finish handling it. Each packet command is associated 2034 * with a callback function that will be called when the command is 2035 * finished. 2036 * 2037 * The handling will be done in three stages: 2038 * 2039 * 1. idetape_issue_packet_command will send the packet command to the 2040 * drive, and will set the interrupt handler to idetape_pc_intr. 2041 * 2042 * 2. On each interrupt, idetape_pc_intr will be called. This step 2043 * will be repeated until the device signals us that no more 2044 * interrupts will be issued. 2045 * 2046 * 3. ATAPI Tape media access commands have immediate status with a 2047 * delayed process. In case of a successful initiation of a 2048 * media access packet command, the DSC bit will be set when the 2049 * actual execution of the command is finished. 2050 * Since the tape drive will not issue an interrupt, we have to 2051 * poll for this event. In this case, we define the request as 2052 * "low priority request" by setting rq_status to 2053 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit 2054 * the driver. 2055 * 2056 * ide.c will then give higher priority to requests which 2057 * originate from the other device, until will change rq_status 2058 * to RQ_ACTIVE. 2059 * 2060 * 4. When the packet command is finished, it will be checked for errors. 2061 * 2062 * 5. In case an error was found, we queue a request sense packet 2063 * command in front of the request queue and retry the operation 2064 * up to IDETAPE_MAX_PC_RETRIES times. 2065 * 2066 * 6. In case no error was found, or we decided to give up and not 2067 * to retry again, the callback function will be called and then 2068 * we will handle the next request. 2069 * 2070 */ 2071static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 2072{ 2073 ide_hwif_t *hwif = drive->hwif; 2074 idetape_tape_t *tape = drive->driver_data; 2075 idetape_pc_t *pc = tape->pc; 2076 int retries = 100; 2077 ide_startstop_t startstop; 2078 u8 ireason; 2079 2080 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { 2081 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); 2082 return startstop; 2083 } 2084 ireason = hwif->INB(IDE_IREASON_REG); 2085 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { 2086 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " 2087 "a packet command, retrying\n"); 2088 udelay(100); 2089 ireason = hwif->INB(IDE_IREASON_REG); 2090 if (retries == 0) { 2091 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " 2092 "issuing a packet command, ignoring\n"); 2093 ireason |= CD; 2094 ireason &= ~IO; 2095 } 2096 } 2097 if ((ireason & CD) == 0 || (ireason & IO)) { 2098 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " 2099 "a packet command\n"); 2100 return ide_do_reset(drive); 2101 } 2102 /* Set the interrupt routine */ 2103 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 2104#ifdef CONFIG_BLK_DEV_IDEDMA 2105 /* Begin DMA, if necessary */ 2106 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) 2107 hwif->dma_start(drive); 2108#endif 2109 /* Send the actual packet */ 2110 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); 2111 return ide_started; 2112} 2113 2114static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) 2115{ 2116 ide_hwif_t *hwif = drive->hwif; 2117 idetape_tape_t *tape = drive->driver_data; 2118 int dma_ok = 0; 2119 u16 bcount; 2120 2121#if IDETAPE_DEBUG_BUGS 2122 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && 2123 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 2124 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " 2125 "Two request sense in serial were issued\n"); 2126 } 2127#endif /* IDETAPE_DEBUG_BUGS */ 2128 2129 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) 2130 tape->failed_pc = pc; 2131 /* Set the current packet command */ 2132 tape->pc = pc; 2133 2134 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 2135 test_bit(PC_ABORT, &pc->flags)) { 2136 /* 2137 * We will "abort" retrying a packet command in case 2138 * a legitimate error code was received (crossing a 2139 * filemark, or end of the media, for example). 2140 */ 2141 if (!test_bit(PC_ABORT, &pc->flags)) { 2142 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && 2143 tape->sense_key == 2 && tape->asc == 4 && 2144 (tape->ascq == 1 || tape->ascq == 8))) { 2145 printk(KERN_ERR "ide-tape: %s: I/O error, " 2146 "pc = %2x, key = %2x, " 2147 "asc = %2x, ascq = %2x\n", 2148 tape->name, pc->c[0], 2149 tape->sense_key, tape->asc, 2150 tape->ascq); 2151 } 2152 /* Giving up */ 2153 pc->error = IDETAPE_ERROR_GENERAL; 2154 } 2155 tape->failed_pc = NULL; 2156 return pc->callback(drive); 2157 } 2158#if IDETAPE_DEBUG_LOG 2159 if (tape->debug_level >= 2) 2160 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); 2161#endif /* IDETAPE_DEBUG_LOG */ 2162 2163 pc->retries++; 2164 /* We haven't transferred any data yet */ 2165 pc->actually_transferred = 0; 2166 pc->current_position = pc->buffer; 2167 /* Request to transfer the entire buffer at once */ 2168 bcount = pc->request_transfer; 2169 2170 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { 2171 printk(KERN_WARNING "ide-tape: DMA disabled, " 2172 "reverting to PIO\n"); 2173 ide_dma_off(drive); 2174 } 2175 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) 2176 dma_ok = !hwif->dma_setup(drive); 2177 2178 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK | 2179 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok); 2180 2181 if (dma_ok) /* Will begin DMA later */ 2182 set_bit(PC_DMA_IN_PROGRESS, &pc->flags); 2183 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { 2184 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); 2185 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); 2186 return ide_started; 2187 } else { 2188 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); 2189 return idetape_transfer_pc(drive); 2190 } 2191} 2192 2193/* 2194 * General packet command callback function. 2195 */ 2196static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) 2197{ 2198 idetape_tape_t *tape = drive->driver_data; 2199 2200#if IDETAPE_DEBUG_LOG 2201 if (tape->debug_level >= 4) 2202 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); 2203#endif /* IDETAPE_DEBUG_LOG */ 2204 2205 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); 2206 return ide_stopped; 2207} 2208 2209/* 2210 * A mode sense command is used to "sense" tape parameters. 2211 */ 2212static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) 2213{ 2214 idetape_init_pc(pc); 2215 pc->c[0] = IDETAPE_MODE_SENSE_CMD; 2216 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 2217 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ 2218 pc->c[2] = page_code; 2219 /* 2220 * Changed pc->c[3] to 0 (255 will at best return unused info). 2221 * 2222 * For SCSI this byte is defined as subpage instead of high byte 2223 * of length and some IDE drives seem to interpret it this way 2224 * and return an error when 255 is used. 2225 */ 2226 pc->c[3] = 0; 2227 pc->c[4] = 255; /* (We will just discard data in that case) */ 2228 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 2229 pc->request_transfer = 12; 2230 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 2231 pc->request_transfer = 24; 2232 else 2233 pc->request_transfer = 50; 2234 pc->callback = &idetape_pc_callback; 2235} 2236 2237static void calculate_speeds(ide_drive_t *drive) 2238{ 2239 idetape_tape_t *tape = drive->driver_data; 2240 int full = 125, empty = 75; 2241 2242 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { 2243 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; 2244 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; 2245 tape->controlled_last_pipeline_head = tape->pipeline_head; 2246 tape->controlled_pipeline_head_time = jiffies; 2247 } 2248 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) 2249 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); 2250 else if (time_after(jiffies, tape->controlled_previous_head_time)) 2251 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); 2252 2253 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { 2254 /* -1 for read mode error recovery */ 2255 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { 2256 tape->uncontrolled_pipeline_head_time = jiffies; 2257 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); 2258 } 2259 } else { 2260 tape->uncontrolled_previous_head_time = jiffies; 2261 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; 2262 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { 2263 tape->uncontrolled_pipeline_head_time = jiffies; 2264 } 2265 } 2266 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); 2267 if (tape->speed_control == 0) { 2268 tape->max_insert_speed = 5000; 2269 } else if (tape->speed_control == 1) { 2270 if (tape->nr_pending_stages >= tape->max_stages / 2) 2271 tape->max_insert_speed = tape->pipeline_head_speed + 2272 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; 2273 else 2274 tape->max_insert_speed = 500 + 2275 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; 2276 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) 2277 tape->max_insert_speed = 5000; 2278 } else if (tape->speed_control == 2) { 2279 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + 2280 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; 2281 } else 2282 tape->max_insert_speed = tape->speed_control; 2283 tape->max_insert_speed = max(tape->max_insert_speed, 500); 2284} 2285 2286static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) 2287{ 2288 idetape_tape_t *tape = drive->driver_data; 2289 idetape_pc_t *pc = tape->pc; 2290 u8 stat; 2291 2292 stat = drive->hwif->INB(IDE_STATUS_REG); 2293 if (stat & SEEK_STAT) { 2294 if (stat & ERR_STAT) { 2295 /* Error detected */ 2296 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) 2297 printk(KERN_ERR "ide-tape: %s: I/O error, ", 2298 tape->name); 2299 /* Retry operation */ 2300 return idetape_retry_pc(drive); 2301 } 2302 pc->error = 0; 2303 if (tape->failed_pc == pc) 2304 tape->failed_pc = NULL; 2305 } else { 2306 pc->error = IDETAPE_ERROR_GENERAL; 2307 tape->failed_pc = NULL; 2308 } 2309 return pc->callback(drive); 2310} 2311 2312static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) 2313{ 2314 idetape_tape_t *tape = drive->driver_data; 2315 struct request *rq = HWGROUP(drive)->rq; 2316 int blocks = tape->pc->actually_transferred / tape->tape_block_size; 2317 2318 tape->avg_size += blocks * tape->tape_block_size; 2319 tape->insert_size += blocks * tape->tape_block_size; 2320 if (tape->insert_size > 1024 * 1024) 2321 tape->measure_insert_time = 1; 2322 if (tape->measure_insert_time) { 2323 tape->measure_insert_time = 0; 2324 tape->insert_time = jiffies; 2325 tape->insert_size = 0; 2326 } 2327 if (time_after(jiffies, tape->insert_time)) 2328 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2329 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 2330 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; 2331 tape->avg_size = 0; 2332 tape->avg_time = jiffies; 2333 } 2334 2335#if IDETAPE_DEBUG_LOG 2336 if (tape->debug_level >= 4) 2337 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); 2338#endif /* IDETAPE_DEBUG_LOG */ 2339 2340 tape->first_frame_position += blocks; 2341 rq->current_nr_sectors -= blocks; 2342 2343 if (!tape->pc->error) 2344 idetape_end_request(drive, 1, 0); 2345 else 2346 idetape_end_request(drive, tape->pc->error, 0); 2347 return ide_stopped; 2348} 2349 2350static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 2351{ 2352 idetape_init_pc(pc); 2353 pc->c[0] = IDETAPE_READ_CMD; 2354 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 2355 pc->c[1] = 1; 2356 pc->callback = &idetape_rw_callback; 2357 pc->bh = bh; 2358 atomic_set(&bh->b_count, 0); 2359 pc->buffer = NULL; 2360 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 2361 if (pc->request_transfer == tape->stage_size) 2362 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 2363} 2364 2365static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 2366{ 2367 int size = 32768; 2368 struct idetape_bh *p = bh; 2369 2370 idetape_init_pc(pc); 2371 pc->c[0] = IDETAPE_READ_BUFFER_CMD; 2372 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; 2373 pc->c[7] = size >> 8; 2374 pc->c[8] = size & 0xff; 2375 pc->callback = &idetape_pc_callback; 2376 pc->bh = bh; 2377 atomic_set(&bh->b_count, 0); 2378 pc->buffer = NULL; 2379 while (p) { 2380 atomic_set(&p->b_count, 0); 2381 p = p->b_reqnext; 2382 } 2383 pc->request_transfer = pc->buffer_size = size; 2384} 2385 2386static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 2387{ 2388 idetape_init_pc(pc); 2389 pc->c[0] = IDETAPE_WRITE_CMD; 2390 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 2391 pc->c[1] = 1; 2392 pc->callback = &idetape_rw_callback; 2393 set_bit(PC_WRITING, &pc->flags); 2394 pc->bh = bh; 2395 pc->b_data = bh->b_data; 2396 pc->b_count = atomic_read(&bh->b_count); 2397 pc->buffer = NULL; 2398 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 2399 if (pc->request_transfer == tape->stage_size) 2400 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 2401} 2402 2403/* 2404 * idetape_do_request is our request handling function. 2405 */ 2406static ide_startstop_t idetape_do_request(ide_drive_t *drive, 2407 struct request *rq, sector_t block) 2408{ 2409 idetape_tape_t *tape = drive->driver_data; 2410 idetape_pc_t *pc = NULL; 2411 struct request *postponed_rq = tape->postponed_rq; 2412 u8 stat; 2413 2414#if IDETAPE_DEBUG_LOG 2415#if 0 2416 if (tape->debug_level >= 5) 2417 printk(KERN_INFO "ide-tape: %d, " 2418 "dev: %s, cmd: %ld, errors: %d\n", 2419 rq->rq_disk->disk_name, rq->cmd[0], rq->errors); 2420#endif 2421 if (tape->debug_level >= 2) 2422 printk(KERN_INFO "ide-tape: sector: %ld, " 2423 "nr_sectors: %ld, current_nr_sectors: %d\n", 2424 rq->sector, rq->nr_sectors, rq->current_nr_sectors); 2425#endif /* IDETAPE_DEBUG_LOG */ 2426 2427 if (!blk_special_request(rq)) { 2428 /* 2429 * We do not support buffer cache originated requests. 2430 */ 2431 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 2432 "request queue (%d)\n", drive->name, rq->cmd_type); 2433 ide_end_request(drive, 0, 0); 2434 return ide_stopped; 2435 } 2436 2437 /* 2438 * Retry a failed packet command 2439 */ 2440 if (tape->failed_pc != NULL && 2441 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 2442 return idetape_issue_packet_command(drive, tape->failed_pc); 2443 } 2444#if IDETAPE_DEBUG_BUGS 2445 if (postponed_rq != NULL) 2446 if (rq != postponed_rq) { 2447 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 2448 "Two DSC requests were queued\n"); 2449 idetape_end_request(drive, 0, 0); 2450 return ide_stopped; 2451 } 2452#endif /* IDETAPE_DEBUG_BUGS */ 2453 2454 tape->postponed_rq = NULL; 2455 2456 /* 2457 * If the tape is still busy, postpone our request and service 2458 * the other device meanwhile. 2459 */ 2460 stat = drive->hwif->INB(IDE_STATUS_REG); 2461 2462 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) 2463 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 2464 2465 if (drive->post_reset == 1) { 2466 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 2467 drive->post_reset = 0; 2468 } 2469 2470 if (tape->tape_still_time > 100 && tape->tape_still_time < 200) 2471 tape->measure_insert_time = 1; 2472 if (time_after(jiffies, tape->insert_time)) 2473 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2474 calculate_speeds(drive); 2475 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && 2476 (stat & SEEK_STAT) == 0) { 2477 if (postponed_rq == NULL) { 2478 tape->dsc_polling_start = jiffies; 2479 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; 2480 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 2481 } else if (time_after(jiffies, tape->dsc_timeout)) { 2482 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 2483 tape->name); 2484 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 2485 idetape_media_access_finished(drive); 2486 return ide_stopped; 2487 } else { 2488 return ide_do_reset(drive); 2489 } 2490 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD)) 2491 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; 2492 idetape_postpone_request(drive); 2493 return ide_stopped; 2494 } 2495 if (rq->cmd[0] & REQ_IDETAPE_READ) { 2496 tape->buffer_head++; 2497 tape->postpone_cnt = 0; 2498 pc = idetape_next_pc_storage(drive); 2499 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2500 goto out; 2501 } 2502 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 2503 tape->buffer_head++; 2504 tape->postpone_cnt = 0; 2505 pc = idetape_next_pc_storage(drive); 2506 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2507 goto out; 2508 } 2509 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { 2510 tape->postpone_cnt = 0; 2511 pc = idetape_next_pc_storage(drive); 2512 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2513 goto out; 2514 } 2515 if (rq->cmd[0] & REQ_IDETAPE_PC1) { 2516 pc = (idetape_pc_t *) rq->buffer; 2517 rq->cmd[0] &= ~(REQ_IDETAPE_PC1); 2518 rq->cmd[0] |= REQ_IDETAPE_PC2; 2519 goto out; 2520 } 2521 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 2522 idetape_media_access_finished(drive); 2523 return ide_stopped; 2524 } 2525 BUG(); 2526out: 2527 return idetape_issue_packet_command(drive, pc); 2528} 2529 2530/* 2531 * Pipeline related functions 2532 */ 2533static inline int idetape_pipeline_active (idetape_tape_t *tape) 2534{ 2535 int rc1, rc2; 2536 2537 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2538 rc2 = (tape->active_data_request != NULL); 2539 return rc1; 2540} 2541 2542/* 2543 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline 2544 * stage, along with all the necessary small buffers which together make 2545 * a buffer of size tape->stage_size (or a bit more). We attempt to 2546 * combine sequential pages as much as possible. 2547 * 2548 * Returns a pointer to the new allocated stage, or NULL if we 2549 * can't (or don't want to) allocate a stage. 2550 * 2551 * Pipeline stages are optional and are used to increase performance. 2552 * If we can't allocate them, we'll manage without them. 2553 */ 2554static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) 2555{ 2556 idetape_stage_t *stage; 2557 struct idetape_bh *prev_bh, *bh; 2558 int pages = tape->pages_per_stage; 2559 char *b_data = NULL; 2560 2561 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) 2562 return NULL; 2563 stage->next = NULL; 2564 2565 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 2566 if (bh == NULL) 2567 goto abort; 2568 bh->b_reqnext = NULL; 2569 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2570 goto abort; 2571 if (clear) 2572 memset(bh->b_data, 0, PAGE_SIZE); 2573 bh->b_size = PAGE_SIZE; 2574 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2575 2576 while (--pages) { 2577 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2578 goto abort; 2579 if (clear) 2580 memset(b_data, 0, PAGE_SIZE); 2581 if (bh->b_data == b_data + PAGE_SIZE) { 2582 bh->b_size += PAGE_SIZE; 2583 bh->b_data -= PAGE_SIZE; 2584 if (full) 2585 atomic_add(PAGE_SIZE, &bh->b_count); 2586 continue; 2587 } 2588 if (b_data == bh->b_data + bh->b_size) { 2589 bh->b_size += PAGE_SIZE; 2590 if (full) 2591 atomic_add(PAGE_SIZE, &bh->b_count); 2592 continue; 2593 } 2594 prev_bh = bh; 2595 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { 2596 free_page((unsigned long) b_data); 2597 goto abort; 2598 } 2599 bh->b_reqnext = NULL; 2600 bh->b_data = b_data; 2601 bh->b_size = PAGE_SIZE; 2602 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2603 prev_bh->b_reqnext = bh; 2604 } 2605 bh->b_size -= tape->excess_bh_size; 2606 if (full) 2607 atomic_sub(tape->excess_bh_size, &bh->b_count); 2608 return stage; 2609abort: 2610 __idetape_kfree_stage(stage); 2611 return NULL; 2612} 2613 2614static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) 2615{ 2616 idetape_stage_t *cache_stage = tape->cache_stage; 2617 2618#if IDETAPE_DEBUG_LOG 2619 if (tape->debug_level >= 4) 2620 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); 2621#endif /* IDETAPE_DEBUG_LOG */ 2622 2623 if (tape->nr_stages >= tape->max_stages) 2624 return NULL; 2625 if (cache_stage != NULL) { 2626 tape->cache_stage = NULL; 2627 return cache_stage; 2628 } 2629 return __idetape_kmalloc_stage(tape, 0, 0); 2630} 2631 2632static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) 2633{ 2634 struct idetape_bh *bh = tape->bh; 2635 int count; 2636 int ret = 0; 2637 2638 while (n) { 2639#if IDETAPE_DEBUG_BUGS 2640 if (bh == NULL) { 2641 printk(KERN_ERR "ide-tape: bh == NULL in " 2642 "idetape_copy_stage_from_user\n"); 2643 return 1; 2644 } 2645#endif /* IDETAPE_DEBUG_BUGS */ 2646 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); 2647 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count)) 2648 ret = 1; 2649 n -= count; 2650 atomic_add(count, &bh->b_count); 2651 buf += count; 2652 if (atomic_read(&bh->b_count) == bh->b_size) { 2653 bh = bh->b_reqnext; 2654 if (bh) 2655 atomic_set(&bh->b_count, 0); 2656 } 2657 } 2658 tape->bh = bh; 2659 return ret; 2660} 2661 2662static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) 2663{ 2664 struct idetape_bh *bh = tape->bh; 2665 int count; 2666 int ret = 0; 2667 2668 while (n) { 2669#if IDETAPE_DEBUG_BUGS 2670 if (bh == NULL) { 2671 printk(KERN_ERR "ide-tape: bh == NULL in " 2672 "idetape_copy_stage_to_user\n"); 2673 return 1; 2674 } 2675#endif /* IDETAPE_DEBUG_BUGS */ 2676 count = min(tape->b_count, n); 2677 if (copy_to_user(buf, tape->b_data, count)) 2678 ret = 1; 2679 n -= count; 2680 tape->b_data += count; 2681 tape->b_count -= count; 2682 buf += count; 2683 if (!tape->b_count) { 2684 tape->bh = bh = bh->b_reqnext; 2685 if (bh) { 2686 tape->b_data = bh->b_data; 2687 tape->b_count = atomic_read(&bh->b_count); 2688 } 2689 } 2690 } 2691 return ret; 2692} 2693 2694static void idetape_init_merge_stage (idetape_tape_t *tape) 2695{ 2696 struct idetape_bh *bh = tape->merge_stage->bh; 2697 2698 tape->bh = bh; 2699 if (tape->chrdev_direction == idetape_direction_write) 2700 atomic_set(&bh->b_count, 0); 2701 else { 2702 tape->b_data = bh->b_data; 2703 tape->b_count = atomic_read(&bh->b_count); 2704 } 2705} 2706 2707static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) 2708{ 2709 struct idetape_bh *tmp; 2710 2711 tmp = stage->bh; 2712 stage->bh = tape->merge_stage->bh; 2713 tape->merge_stage->bh = tmp; 2714 idetape_init_merge_stage(tape); 2715} 2716 2717/* 2718 * idetape_add_stage_tail adds a new stage at the end of the pipeline. 2719 */ 2720static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) 2721{ 2722 idetape_tape_t *tape = drive->driver_data; 2723 unsigned long flags; 2724 2725#if IDETAPE_DEBUG_LOG 2726 if (tape->debug_level >= 4) 2727 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); 2728#endif /* IDETAPE_DEBUG_LOG */ 2729 spin_lock_irqsave(&tape->spinlock, flags); 2730 stage->next = NULL; 2731 if (tape->last_stage != NULL) 2732 tape->last_stage->next=stage; 2733 else 2734 tape->first_stage = tape->next_stage=stage; 2735 tape->last_stage = stage; 2736 if (tape->next_stage == NULL) 2737 tape->next_stage = tape->last_stage; 2738 tape->nr_stages++; 2739 tape->nr_pending_stages++; 2740 spin_unlock_irqrestore(&tape->spinlock, flags); 2741} 2742 2743/* 2744 * idetape_wait_for_request installs a completion in a pending request 2745 * and sleeps until it is serviced. 2746 * 2747 * The caller should ensure that the request will not be serviced 2748 * before we install the completion (usually by disabling interrupts). 2749 */ 2750static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) 2751{ 2752 DECLARE_COMPLETION_ONSTACK(wait); 2753 idetape_tape_t *tape = drive->driver_data; 2754 2755#if IDETAPE_DEBUG_BUGS 2756 if (rq == NULL || !blk_special_request(rq)) { 2757 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); 2758 return; 2759 } 2760#endif /* IDETAPE_DEBUG_BUGS */ 2761 rq->end_io_data = &wait; 2762 rq->end_io = blk_end_sync_rq; 2763 spin_unlock_irq(&tape->spinlock); 2764 wait_for_completion(&wait); 2765 /* The stage and its struct request have been deallocated */ 2766 spin_lock_irq(&tape->spinlock); 2767} 2768 2769static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) 2770{ 2771 idetape_tape_t *tape = drive->driver_data; 2772 idetape_read_position_result_t *result; 2773 2774#if IDETAPE_DEBUG_LOG 2775 if (tape->debug_level >= 4) 2776 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); 2777#endif /* IDETAPE_DEBUG_LOG */ 2778 2779 if (!tape->pc->error) { 2780 result = (idetape_read_position_result_t *) tape->pc->buffer; 2781#if IDETAPE_DEBUG_LOG 2782 if (tape->debug_level >= 2) 2783 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); 2784 if (tape->debug_level >= 2) 2785 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); 2786#endif /* IDETAPE_DEBUG_LOG */ 2787 if (result->bpu) { 2788 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); 2789 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2790 idetape_end_request(drive, 0, 0); 2791 } else { 2792#if IDETAPE_DEBUG_LOG 2793 if (tape->debug_level >= 2) 2794 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); 2795#endif /* IDETAPE_DEBUG_LOG */ 2796 tape->partition = result->partition; 2797 tape->first_frame_position = ntohl(result->first_block); 2798 tape->last_frame_position = ntohl(result->last_block); 2799 tape->blocks_in_buffer = result->blocks_in_buffer[2]; 2800 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2801 idetape_end_request(drive, 1, 0); 2802 } 2803 } else { 2804 idetape_end_request(drive, 0, 0); 2805 } 2806 return ide_stopped; 2807} 2808 2809/* 2810 * idetape_create_write_filemark_cmd will: 2811 * 2812 * 1. Write a filemark if write_filemark=1. 2813 * 2. Flush the device buffers without writing a filemark 2814 * if write_filemark=0. 2815 * 2816 */ 2817static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) 2818{ 2819 idetape_init_pc(pc); 2820 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; 2821 pc->c[4] = write_filemark; 2822 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2823 pc->callback = &idetape_pc_callback; 2824} 2825 2826static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) 2827{ 2828 idetape_init_pc(pc); 2829 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; 2830 pc->callback = &idetape_pc_callback; 2831} 2832 2833/* 2834 * idetape_queue_pc_tail is based on the following functions: 2835 * 2836 * ide_do_drive_cmd from ide.c 2837 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c 2838 * 2839 * We add a special packet command request to the tail of the request 2840 * queue, and wait for it to be serviced. 2841 * 2842 * This is not to be called from within the request handling part 2843 * of the driver ! We allocate here data in the stack, and it is valid 2844 * until the request is finished. This is not the case for the bottom 2845 * part of the driver, where we are always leaving the functions to wait 2846 * for an interrupt or a timer event. 2847 * 2848 * From the bottom part of the driver, we should allocate safe memory 2849 * using idetape_next_pc_storage and idetape_next_rq_storage, and add 2850 * the request to the request list without waiting for it to be serviced ! 2851 * In that case, we usually use idetape_queue_pc_head. 2852 */ 2853static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) 2854{ 2855 struct ide_tape_obj *tape = drive->driver_data; 2856 struct request rq; 2857 2858 idetape_init_rq(&rq, REQ_IDETAPE_PC1); 2859 rq.buffer = (char *) pc; 2860 rq.rq_disk = tape->disk; 2861 return ide_do_drive_cmd(drive, &rq, ide_wait); 2862} 2863 2864static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) 2865{ 2866 idetape_init_pc(pc); 2867 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; 2868 pc->c[4] = cmd; 2869 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2870 pc->callback = &idetape_pc_callback; 2871} 2872 2873static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 2874{ 2875 idetape_tape_t *tape = drive->driver_data; 2876 idetape_pc_t pc; 2877 int load_attempted = 0; 2878 2879 /* 2880 * Wait for the tape to become ready 2881 */ 2882 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 2883 timeout += jiffies; 2884 while (time_before(jiffies, timeout)) { 2885 idetape_create_test_unit_ready_cmd(&pc); 2886 if (!__idetape_queue_pc_tail(drive, &pc)) 2887 return 0; 2888 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 2889 || (tape->asc == 0x3A)) { /* no media */ 2890 if (load_attempted) 2891 return -ENOMEDIUM; 2892 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 2893 __idetape_queue_pc_tail(drive, &pc); 2894 load_attempted = 1; 2895 /* not about to be ready */ 2896 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 2897 (tape->ascq == 1 || tape->ascq == 8))) 2898 return -EIO; 2899 msleep(100); 2900 } 2901 return -EIO; 2902} 2903 2904static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) 2905{ 2906 return __idetape_queue_pc_tail(drive, pc); 2907} 2908 2909static int idetape_flush_tape_buffers (ide_drive_t *drive) 2910{ 2911 idetape_pc_t pc; 2912 int rc; 2913 2914 idetape_create_write_filemark_cmd(drive, &pc, 0); 2915 if ((rc = idetape_queue_pc_tail(drive, &pc))) 2916 return rc; 2917 idetape_wait_ready(drive, 60 * 5 * HZ); 2918 return 0; 2919} 2920 2921static void idetape_create_read_position_cmd (idetape_pc_t *pc) 2922{ 2923 idetape_init_pc(pc); 2924 pc->c[0] = IDETAPE_READ_POSITION_CMD; 2925 pc->request_transfer = 20; 2926 pc->callback = &idetape_read_position_callback; 2927} 2928 2929static int idetape_read_position (ide_drive_t *drive) 2930{ 2931 idetape_tape_t *tape = drive->driver_data; 2932 idetape_pc_t pc; 2933 int position; 2934 2935#if IDETAPE_DEBUG_LOG 2936 if (tape->debug_level >= 4) 2937 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); 2938#endif /* IDETAPE_DEBUG_LOG */ 2939 2940 idetape_create_read_position_cmd(&pc); 2941 if (idetape_queue_pc_tail(drive, &pc)) 2942 return -1; 2943 position = tape->first_frame_position; 2944 return position; 2945} 2946 2947static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) 2948{ 2949 idetape_init_pc(pc); 2950 pc->c[0] = IDETAPE_LOCATE_CMD; 2951 pc->c[1] = 2; 2952 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); 2953 pc->c[8] = partition; 2954 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2955 pc->callback = &idetape_pc_callback; 2956} 2957 2958static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) 2959{ 2960 idetape_tape_t *tape = drive->driver_data; 2961 2962 if (!tape->capabilities.lock) 2963 return 0; 2964 2965 idetape_init_pc(pc); 2966 pc->c[0] = IDETAPE_PREVENT_CMD; 2967 pc->c[4] = prevent; 2968 pc->callback = &idetape_pc_callback; 2969 return 1; 2970} 2971 2972static int __idetape_discard_read_pipeline (ide_drive_t *drive) 2973{ 2974 idetape_tape_t *tape = drive->driver_data; 2975 unsigned long flags; 2976 int cnt; 2977 2978 if (tape->chrdev_direction != idetape_direction_read) 2979 return 0; 2980 2981 /* Remove merge stage. */ 2982 cnt = tape->merge_stage_size / tape->tape_block_size; 2983 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 2984 ++cnt; /* Filemarks count as 1 sector */ 2985 tape->merge_stage_size = 0; 2986 if (tape->merge_stage != NULL) { 2987 __idetape_kfree_stage(tape->merge_stage); 2988 tape->merge_stage = NULL; 2989 } 2990 2991 /* Clear pipeline flags. */ 2992 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 2993 tape->chrdev_direction = idetape_direction_none; 2994 2995 /* Remove pipeline stages. */ 2996 if (tape->first_stage == NULL) 2997 return 0; 2998 2999 spin_lock_irqsave(&tape->spinlock, flags); 3000 tape->next_stage = NULL; 3001 if (idetape_pipeline_active(tape)) 3002 idetape_wait_for_request(drive, tape->active_data_request); 3003 spin_unlock_irqrestore(&tape->spinlock, flags); 3004 3005 while (tape->first_stage != NULL) { 3006 struct request *rq_ptr = &tape->first_stage->rq; 3007 3008 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; 3009 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 3010 ++cnt; 3011 idetape_remove_stage_head(drive); 3012 } 3013 tape->nr_pending_stages = 0; 3014 tape->max_stages = tape->min_pipeline; 3015 return cnt; 3016} 3017 3018/* 3019 * idetape_position_tape positions the tape to the requested block 3020 * using the LOCATE packet command. A READ POSITION command is then 3021 * issued to check where we are positioned. 3022 * 3023 * Like all higher level operations, we queue the commands at the tail 3024 * of the request queue and wait for their completion. 3025 * 3026 */ 3027static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) 3028{ 3029 idetape_tape_t *tape = drive->driver_data; 3030 int retval; 3031 idetape_pc_t pc; 3032 3033 if (tape->chrdev_direction == idetape_direction_read) 3034 __idetape_discard_read_pipeline(drive); 3035 idetape_wait_ready(drive, 60 * 5 * HZ); 3036 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 3037 retval = idetape_queue_pc_tail(drive, &pc); 3038 if (retval) 3039 return (retval); 3040 3041 idetape_create_read_position_cmd(&pc); 3042 return (idetape_queue_pc_tail(drive, &pc)); 3043} 3044 3045static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) 3046{ 3047 idetape_tape_t *tape = drive->driver_data; 3048 int cnt; 3049 int seek, position; 3050 3051 cnt = __idetape_discard_read_pipeline(drive); 3052 if (restore_position) { 3053 position = idetape_read_position(drive); 3054 seek = position > cnt ? position - cnt : 0; 3055 if (idetape_position_tape(drive, seek, 0, 0)) { 3056 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); 3057 return; 3058 } 3059 } 3060} 3061 3062/* 3063 * idetape_queue_rw_tail generates a read/write request for the block 3064 * device interface and wait for it to be serviced. 3065 */ 3066static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) 3067{ 3068 idetape_tape_t *tape = drive->driver_data; 3069 struct request rq; 3070 3071#if IDETAPE_DEBUG_LOG 3072 if (tape->debug_level >= 2) 3073 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); 3074#endif /* IDETAPE_DEBUG_LOG */ 3075#if IDETAPE_DEBUG_BUGS 3076 if (idetape_pipeline_active(tape)) { 3077 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); 3078 return (0); 3079 } 3080#endif /* IDETAPE_DEBUG_BUGS */ 3081 3082 idetape_init_rq(&rq, cmd); 3083 rq.rq_disk = tape->disk; 3084 rq.special = (void *)bh; 3085 rq.sector = tape->first_frame_position; 3086 rq.nr_sectors = rq.current_nr_sectors = blocks; 3087 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 3088 3089 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) 3090 return 0; 3091 3092 if (tape->merge_stage) 3093 idetape_init_merge_stage(tape); 3094 if (rq.errors == IDETAPE_ERROR_GENERAL) 3095 return -EIO; 3096 return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); 3097} 3098 3099/* 3100 * idetape_insert_pipeline_into_queue is used to start servicing the 3101 * pipeline stages, starting from tape->next_stage. 3102 */ 3103static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) 3104{ 3105 idetape_tape_t *tape = drive->driver_data; 3106 3107 if (tape->next_stage == NULL) 3108 return; 3109 if (!idetape_pipeline_active(tape)) { 3110 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 3111 idetape_active_next_stage(drive); 3112 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 3113 } 3114} 3115 3116static void idetape_create_inquiry_cmd (idetape_pc_t *pc) 3117{ 3118 idetape_init_pc(pc); 3119 pc->c[0] = IDETAPE_INQUIRY_CMD; 3120 pc->c[4] = pc->request_transfer = 254; 3121 pc->callback = &idetape_pc_callback; 3122} 3123 3124static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) 3125{ 3126 idetape_init_pc(pc); 3127 pc->c[0] = IDETAPE_REWIND_CMD; 3128 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 3129 pc->callback = &idetape_pc_callback; 3130} 3131 3132#if 0 3133static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) 3134{ 3135 idetape_init_pc(pc); 3136 set_bit(PC_WRITING, &pc->flags); 3137 pc->c[0] = IDETAPE_MODE_SELECT_CMD; 3138 pc->c[1] = 0x10; 3139 put_unaligned(htons(length), (unsigned short *) &pc->c[3]); 3140 pc->request_transfer = 255; 3141 pc->callback = &idetape_pc_callback; 3142} 3143#endif 3144 3145static void idetape_create_erase_cmd (idetape_pc_t *pc) 3146{ 3147 idetape_init_pc(pc); 3148 pc->c[0] = IDETAPE_ERASE_CMD; 3149 pc->c[1] = 1; 3150 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 3151 pc->callback = &idetape_pc_callback; 3152} 3153 3154static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) 3155{ 3156 idetape_init_pc(pc); 3157 pc->c[0] = IDETAPE_SPACE_CMD; 3158 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); 3159 pc->c[1] = cmd; 3160 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 3161 pc->callback = &idetape_pc_callback; 3162} 3163 3164static void idetape_wait_first_stage (ide_drive_t *drive) 3165{ 3166 idetape_tape_t *tape = drive->driver_data; 3167 unsigned long flags; 3168 3169 if (tape->first_stage == NULL) 3170 return; 3171 spin_lock_irqsave(&tape->spinlock, flags); 3172 if (tape->active_stage == tape->first_stage) 3173 idetape_wait_for_request(drive, tape->active_data_request); 3174 spin_unlock_irqrestore(&tape->spinlock, flags); 3175} 3176 3177/* 3178 * idetape_add_chrdev_write_request tries to add a character device 3179 * originated write request to our pipeline. In case we don't succeed, 3180 * we revert to non-pipelined operation mode for this request. 3181 * 3182 * 1. Try to allocate a new pipeline stage. 3183 * 2. If we can't, wait for more and more requests to be serviced 3184 * and try again each time. 3185 * 3. If we still can't allocate a stage, fallback to 3186 * non-pipelined operation mode for this request. 3187 */ 3188static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) 3189{ 3190 idetape_tape_t *tape = drive->driver_data; 3191 idetape_stage_t *new_stage; 3192 unsigned long flags; 3193 struct request *rq; 3194 3195#if IDETAPE_DEBUG_LOG 3196 if (tape->debug_level >= 3) 3197 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); 3198#endif /* IDETAPE_DEBUG_LOG */ 3199 3200 /* 3201 * Attempt to allocate a new stage. 3202 * Pay special attention to possible race conditions. 3203 */ 3204 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { 3205 spin_lock_irqsave(&tape->spinlock, flags); 3206 if (idetape_pipeline_active(tape)) { 3207 idetape_wait_for_request(drive, tape->active_data_request); 3208 spin_unlock_irqrestore(&tape->spinlock, flags); 3209 } else { 3210 spin_unlock_irqrestore(&tape->spinlock, flags); 3211 idetape_insert_pipeline_into_queue(drive); 3212 if (idetape_pipeline_active(tape)) 3213 continue; 3214 /* 3215 * Linux is short on memory. Fallback to 3216 * non-pipelined operation mode for this request. 3217 */ 3218 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 3219 } 3220 } 3221 rq = &new_stage->rq; 3222 idetape_init_rq(rq, REQ_IDETAPE_WRITE); 3223 /* Doesn't actually matter - We always assume sequential access */ 3224 rq->sector = tape->first_frame_position; 3225 rq->nr_sectors = rq->current_nr_sectors = blocks; 3226 3227 idetape_switch_buffers(tape, new_stage); 3228 idetape_add_stage_tail(drive, new_stage); 3229 tape->pipeline_head++; 3230 calculate_speeds(drive); 3231 3232 /* 3233 * Estimate whether the tape has stopped writing by checking 3234 * if our write pipeline is currently empty. If we are not 3235 * writing anymore, wait for the pipeline to be full enough 3236 * (90%) before starting to service requests, so that we will 3237 * be able to keep up with the higher speeds of the tape. 3238 */ 3239 if (!idetape_pipeline_active(tape)) { 3240 if (tape->nr_stages >= tape->max_stages * 9 / 10 || 3241 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { 3242 tape->measure_insert_time = 1; 3243 tape->insert_time = jiffies; 3244 tape->insert_size = 0; 3245 tape->insert_speed = 0; 3246 idetape_insert_pipeline_into_queue(drive); 3247 } 3248 } 3249 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 3250 /* Return a deferred error */ 3251 return -EIO; 3252 return blocks; 3253} 3254 3255/* 3256 * idetape_wait_for_pipeline will wait until all pending pipeline 3257 * requests are serviced. Typically called on device close. 3258 */ 3259static void idetape_wait_for_pipeline (ide_drive_t *drive) 3260{ 3261 idetape_tape_t *tape = drive->driver_data; 3262 unsigned long flags; 3263 3264 while (tape->next_stage || idetape_pipeline_active(tape)) { 3265 idetape_insert_pipeline_into_queue(drive); 3266 spin_lock_irqsave(&tape->spinlock, flags); 3267 if (idetape_pipeline_active(tape)) 3268 idetape_wait_for_request(drive, tape->active_data_request); 3269 spin_unlock_irqrestore(&tape->spinlock, flags); 3270 } 3271} 3272 3273static void idetape_empty_write_pipeline (ide_drive_t *drive) 3274{ 3275 idetape_tape_t *tape = drive->driver_data; 3276 int blocks, min; 3277 struct idetape_bh *bh; 3278 3279#if IDETAPE_DEBUG_BUGS 3280 if (tape->chrdev_direction != idetape_direction_write) { 3281 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); 3282 return; 3283 } 3284 if (tape->merge_stage_size > tape->stage_size) { 3285 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 3286 tape->merge_stage_size = tape->stage_size; 3287 } 3288#endif /* IDETAPE_DEBUG_BUGS */ 3289 if (tape->merge_stage_size) { 3290 blocks = tape->merge_stage_size / tape->tape_block_size; 3291 if (tape->merge_stage_size % tape->tape_block_size) { 3292 unsigned int i; 3293 3294 blocks++; 3295 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; 3296 bh = tape->bh->b_reqnext; 3297 while (bh) { 3298 atomic_set(&bh->b_count, 0); 3299 bh = bh->b_reqnext; 3300 } 3301 bh = tape->bh; 3302 while (i) { 3303 if (bh == NULL) { 3304 3305 printk(KERN_INFO "ide-tape: bug, bh NULL\n"); 3306 break; 3307 } 3308 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); 3309 memset(bh->b_data + atomic_read(&bh->b_count), 0, min); 3310 atomic_add(min, &bh->b_count); 3311 i -= min; 3312 bh = bh->b_reqnext; 3313 } 3314 } 3315 (void) idetape_add_chrdev_write_request(drive, blocks); 3316 tape->merge_stage_size = 0; 3317 } 3318 idetape_wait_for_pipeline(drive); 3319 if (tape->merge_stage != NULL) { 3320 __idetape_kfree_stage(tape->merge_stage); 3321 tape->merge_stage = NULL; 3322 } 3323 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 3324 tape->chrdev_direction = idetape_direction_none; 3325 3326 /* 3327 * On the next backup, perform the feedback loop again. 3328 * (I don't want to keep sense information between backups, 3329 * as some systems are constantly on, and the system load 3330 * can be totally different on the next backup). 3331 */ 3332 tape->max_stages = tape->min_pipeline; 3333#if IDETAPE_DEBUG_BUGS 3334 if (tape->first_stage != NULL || 3335 tape->next_stage != NULL || 3336 tape->last_stage != NULL || 3337 tape->nr_stages != 0) { 3338 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " 3339 "first_stage %p, next_stage %p, " 3340 "last_stage %p, nr_stages %d\n", 3341 tape->first_stage, tape->next_stage, 3342 tape->last_stage, tape->nr_stages); 3343 } 3344#endif /* IDETAPE_DEBUG_BUGS */ 3345} 3346 3347static void idetape_restart_speed_control (ide_drive_t *drive) 3348{ 3349 idetape_tape_t *tape = drive->driver_data; 3350 3351 tape->restart_speed_control_req = 0; 3352 tape->pipeline_head = 0; 3353 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; 3354 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; 3355 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; 3356 tape->uncontrolled_pipeline_head_speed = 0; 3357 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; 3358 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; 3359} 3360 3361static int idetape_initiate_read (ide_drive_t *drive, int max_stages) 3362{ 3363 idetape_tape_t *tape = drive->driver_data; 3364 idetape_stage_t *new_stage; 3365 struct request rq; 3366 int bytes_read; 3367 int blocks = tape->capabilities.ctl; 3368 3369 /* Initialize read operation */ 3370 if (tape->chrdev_direction != idetape_direction_read) { 3371 if (tape->chrdev_direction == idetape_direction_write) { 3372 idetape_empty_write_pipeline(drive); 3373 idetape_flush_tape_buffers(drive); 3374 } 3375#if IDETAPE_DEBUG_BUGS 3376 if (tape->merge_stage || tape->merge_stage_size) { 3377 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); 3378 tape->merge_stage_size = 0; 3379 } 3380#endif /* IDETAPE_DEBUG_BUGS */ 3381 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 3382 return -ENOMEM; 3383 tape->chrdev_direction = idetape_direction_read; 3384 3385 /* 3386 * Issue a read 0 command to ensure that DSC handshake 3387 * is switched from completion mode to buffer available 3388 * mode. 3389 * No point in issuing this if DSC overlap isn't supported, 3390 * some drives (Seagate STT3401A) will return an error. 3391 */ 3392 if (drive->dsc_overlap) { 3393 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); 3394 if (bytes_read < 0) { 3395 __idetape_kfree_stage(tape->merge_stage); 3396 tape->merge_stage = NULL; 3397 tape->chrdev_direction = idetape_direction_none; 3398 return bytes_read; 3399 } 3400 } 3401 } 3402 if (tape->restart_speed_control_req) 3403 idetape_restart_speed_control(drive); 3404 idetape_init_rq(&rq, REQ_IDETAPE_READ); 3405 rq.sector = tape->first_frame_position; 3406 rq.nr_sectors = rq.current_nr_sectors = blocks; 3407 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && 3408 tape->nr_stages < max_stages) { 3409 new_stage = idetape_kmalloc_stage(tape); 3410 while (new_stage != NULL) { 3411 new_stage->rq = rq; 3412 idetape_add_stage_tail(drive, new_stage); 3413 if (tape->nr_stages >= max_stages) 3414 break; 3415 new_stage = idetape_kmalloc_stage(tape); 3416 } 3417 } 3418 if (!idetape_pipeline_active(tape)) { 3419 if (tape->nr_pending_stages >= 3 * max_stages / 4) { 3420 tape->measure_insert_time = 1; 3421 tape->insert_time = jiffies; 3422 tape->insert_size = 0; 3423 tape->insert_speed = 0; 3424 idetape_insert_pipeline_into_queue(drive); 3425 } 3426 } 3427 return 0; 3428} 3429 3430/* 3431 * idetape_add_chrdev_read_request is called from idetape_chrdev_read 3432 * to service a character device read request and add read-ahead 3433 * requests to our pipeline. 3434 */ 3435static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) 3436{ 3437 idetape_tape_t *tape = drive->driver_data; 3438 unsigned long flags; 3439 struct request *rq_ptr; 3440 int bytes_read; 3441 3442#if IDETAPE_DEBUG_LOG 3443 if (tape->debug_level >= 4) 3444 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); 3445#endif /* IDETAPE_DEBUG_LOG */ 3446 3447 /* 3448 * If we are at a filemark, return a read length of 0 3449 */ 3450 if (test_bit(IDETAPE_FILEMARK, &tape->flags)) 3451 return 0; 3452 3453 /* 3454 * Wait for the next block to be available at the head 3455 * of the pipeline 3456 */ 3457 idetape_initiate_read(drive, tape->max_stages); 3458 if (tape->first_stage == NULL) { 3459 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 3460 return 0; 3461 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); 3462 } 3463 idetape_wait_first_stage(drive); 3464 rq_ptr = &tape->first_stage->rq; 3465 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); 3466 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; 3467 3468 3469 if (rq_ptr->errors == IDETAPE_ERROR_EOD) 3470 return 0; 3471 else { 3472 idetape_switch_buffers(tape, tape->first_stage); 3473 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 3474 set_bit(IDETAPE_FILEMARK, &tape->flags); 3475 spin_lock_irqsave(&tape->spinlock, flags); 3476 idetape_remove_stage_head(drive); 3477 spin_unlock_irqrestore(&tape->spinlock, flags); 3478 tape->pipeline_head++; 3479 calculate_speeds(drive); 3480 } 3481#if IDETAPE_DEBUG_BUGS 3482 if (bytes_read > blocks * tape->tape_block_size) { 3483 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); 3484 bytes_read = blocks * tape->tape_block_size; 3485 } 3486#endif /* IDETAPE_DEBUG_BUGS */ 3487 return (bytes_read); 3488} 3489 3490static void idetape_pad_zeros (ide_drive_t *drive, int bcount) 3491{ 3492 idetape_tape_t *tape = drive->driver_data; 3493 struct idetape_bh *bh; 3494 int blocks; 3495 3496 while (bcount) { 3497 unsigned int count; 3498 3499 bh = tape->merge_stage->bh; 3500 count = min(tape->stage_size, bcount); 3501 bcount -= count; 3502 blocks = count / tape->tape_block_size; 3503 while (count) { 3504 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); 3505 memset(bh->b_data, 0, atomic_read(&bh->b_count)); 3506 count -= atomic_read(&bh->b_count); 3507 bh = bh->b_reqnext; 3508 } 3509 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 3510 } 3511} 3512 3513static int idetape_pipeline_size (ide_drive_t *drive) 3514{ 3515 idetape_tape_t *tape = drive->driver_data; 3516 idetape_stage_t *stage; 3517 struct request *rq; 3518 int size = 0; 3519 3520 idetape_wait_for_pipeline(drive); 3521 stage = tape->first_stage; 3522 while (stage != NULL) { 3523 rq = &stage->rq; 3524 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); 3525 if (rq->errors == IDETAPE_ERROR_FILEMARK) 3526 size += tape->tape_block_size; 3527 stage = stage->next; 3528 } 3529 size += tape->merge_stage_size; 3530 return size; 3531} 3532 3533/* 3534 * Rewinds the tape to the Beginning Of the current Partition (BOP). 3535 * 3536 * We currently support only one partition. 3537 */ 3538static int idetape_rewind_tape (ide_drive_t *drive) 3539{ 3540 int retval; 3541 idetape_pc_t pc; 3542#if IDETAPE_DEBUG_LOG 3543 idetape_tape_t *tape = drive->driver_data; 3544 if (tape->debug_level >= 2) 3545 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); 3546#endif /* IDETAPE_DEBUG_LOG */ 3547 3548 idetape_create_rewind_cmd(drive, &pc); 3549 retval = idetape_queue_pc_tail(drive, &pc); 3550 if (retval) 3551 return retval; 3552 3553 idetape_create_read_position_cmd(&pc); 3554 retval = idetape_queue_pc_tail(drive, &pc); 3555 if (retval) 3556 return retval; 3557 return 0; 3558} 3559 3560/* 3561 * Our special ide-tape ioctl's. 3562 * 3563 * Currently there aren't any ioctl's. 3564 * mtio.h compatible commands should be issued to the character device 3565 * interface. 3566 */ 3567static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) 3568{ 3569 idetape_tape_t *tape = drive->driver_data; 3570 idetape_config_t config; 3571 void __user *argp = (void __user *)arg; 3572 3573#if IDETAPE_DEBUG_LOG 3574 if (tape->debug_level >= 4) 3575 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); 3576#endif /* IDETAPE_DEBUG_LOG */ 3577 switch (cmd) { 3578 case 0x0340: 3579 if (copy_from_user(&config, argp, sizeof (idetape_config_t))) 3580 return -EFAULT; 3581 tape->best_dsc_rw_frequency = config.dsc_rw_frequency; 3582 tape->max_stages = config.nr_stages; 3583 break; 3584 case 0x0350: 3585 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; 3586 config.nr_stages = tape->max_stages; 3587 if (copy_to_user(argp, &config, sizeof (idetape_config_t))) 3588 return -EFAULT; 3589 break; 3590 default: 3591 return -EIO; 3592 } 3593 return 0; 3594} 3595 3596/* 3597 * idetape_space_over_filemarks is now a bit more complicated than just 3598 * passing the command to the tape since we may have crossed some 3599 * filemarks during our pipelined read-ahead mode. 3600 * 3601 * As a minor side effect, the pipeline enables us to support MTFSFM when 3602 * the filemark is in our internal pipeline even if the tape doesn't 3603 * support spacing over filemarks in the reverse direction. 3604 */ 3605static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) 3606{ 3607 idetape_tape_t *tape = drive->driver_data; 3608 idetape_pc_t pc; 3609 unsigned long flags; 3610 int retval,count=0; 3611 3612 if (mt_count == 0) 3613 return 0; 3614 if (MTBSF == mt_op || MTBSFM == mt_op) { 3615 if (!tape->capabilities.sprev) 3616 return -EIO; 3617 mt_count = - mt_count; 3618 } 3619 3620 if (tape->chrdev_direction == idetape_direction_read) { 3621 /* 3622 * We have a read-ahead buffer. Scan it for crossed 3623 * filemarks. 3624 */ 3625 tape->merge_stage_size = 0; 3626 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 3627 ++count; 3628 while (tape->first_stage != NULL) { 3629 if (count == mt_count) { 3630 if (mt_op == MTFSFM) 3631 set_bit(IDETAPE_FILEMARK, &tape->flags); 3632 return 0; 3633 } 3634 spin_lock_irqsave(&tape->spinlock, flags); 3635 if (tape->first_stage == tape->active_stage) { 3636 /* 3637 * We have reached the active stage in the read pipeline. 3638 * There is no point in allowing the drive to continue 3639 * reading any farther, so we stop the pipeline. 3640 * 3641 * This section should be moved to a separate subroutine, 3642 * because a similar function is performed in 3643 * __idetape_discard_read_pipeline(), for example. 3644 */ 3645 tape->next_stage = NULL; 3646 spin_unlock_irqrestore(&tape->spinlock, flags); 3647 idetape_wait_first_stage(drive); 3648 tape->next_stage = tape->first_stage->next; 3649 } else 3650 spin_unlock_irqrestore(&tape->spinlock, flags); 3651 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) 3652 ++count; 3653 idetape_remove_stage_head(drive); 3654 } 3655 idetape_discard_read_pipeline(drive, 0); 3656 } 3657 3658 /* 3659 * The filemark was not found in our internal pipeline. 3660 * Now we can issue the space command. 3661 */ 3662 switch (mt_op) { 3663 case MTFSF: 3664 case MTBSF: 3665 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); 3666 return (idetape_queue_pc_tail(drive, &pc)); 3667 case MTFSFM: 3668 case MTBSFM: 3669 if (!tape->capabilities.sprev) 3670 return (-EIO); 3671 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); 3672 if (retval) return (retval); 3673 count = (MTBSFM == mt_op ? 1 : -1); 3674 return (idetape_space_over_filemarks(drive, MTFSF, count)); 3675 default: 3676 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); 3677 return (-EIO); 3678 } 3679} 3680 3681 3682/* 3683 * Our character device read / write functions. 3684 * 3685 * The tape is optimized to maximize throughput when it is transferring 3686 * an integral number of the "continuous transfer limit", which is 3687 * a parameter of the specific tape (26 KB on my particular tape). 3688 * (32 kB for Onstream) 3689 * 3690 * As of version 1.3 of the driver, the character device provides an 3691 * abstract continuous view of the media - any mix of block sizes (even 1 3692 * byte) on the same backup/restore procedure is supported. The driver 3693 * will internally convert the requests to the recommended transfer unit, 3694 * so that an unmatch between the user's block size to the recommended 3695 * size will only result in a (slightly) increased driver overhead, but 3696 * will no longer hit performance. 3697 * This is not applicable to Onstream. 3698 */ 3699static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, 3700 size_t count, loff_t *ppos) 3701{ 3702 struct ide_tape_obj *tape = ide_tape_f(file); 3703 ide_drive_t *drive = tape->drive; 3704 ssize_t bytes_read,temp, actually_read = 0, rc; 3705 ssize_t ret = 0; 3706 3707#if IDETAPE_DEBUG_LOG 3708 if (tape->debug_level >= 3) 3709 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); 3710#endif /* IDETAPE_DEBUG_LOG */ 3711 3712 if (tape->chrdev_direction != idetape_direction_read) { 3713 if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) 3714 if (count > tape->tape_block_size && 3715 (count % tape->tape_block_size) == 0) 3716 tape->user_bs_factor = count / tape->tape_block_size; 3717 } 3718 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) 3719 return rc; 3720 if (count == 0) 3721 return (0); 3722 if (tape->merge_stage_size) { 3723 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); 3724 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read)) 3725 ret = -EFAULT; 3726 buf += actually_read; 3727 tape->merge_stage_size -= actually_read; 3728 count -= actually_read; 3729 } 3730 while (count >= tape->stage_size) { 3731 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); 3732 if (bytes_read <= 0) 3733 goto finish; 3734 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read)) 3735 ret = -EFAULT; 3736 buf += bytes_read; 3737 count -= bytes_read; 3738 actually_read += bytes_read; 3739 } 3740 if (count) { 3741 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); 3742 if (bytes_read <= 0) 3743 goto finish; 3744 temp = min((unsigned long)count, (unsigned long)bytes_read); 3745 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp)) 3746 ret = -EFAULT; 3747 actually_read += temp; 3748 tape->merge_stage_size = bytes_read-temp; 3749 } 3750finish: 3751 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { 3752#if IDETAPE_DEBUG_LOG 3753 if (tape->debug_level >= 2) 3754 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); 3755#endif 3756 idetape_space_over_filemarks(drive, MTFSF, 1); 3757 return 0; 3758 } 3759 3760 return (ret) ? ret : actually_read; 3761} 3762 3763static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, 3764 size_t count, loff_t *ppos) 3765{ 3766 struct ide_tape_obj *tape = ide_tape_f(file); 3767 ide_drive_t *drive = tape->drive; 3768 ssize_t actually_written = 0; 3769 ssize_t ret = 0; 3770 3771 /* The drive is write protected. */ 3772 if (tape->write_prot) 3773 return -EACCES; 3774 3775#if IDETAPE_DEBUG_LOG 3776 if (tape->debug_level >= 3) 3777 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " 3778 "count %Zd\n", count); 3779#endif /* IDETAPE_DEBUG_LOG */ 3780 3781 /* Initialize write operation */ 3782 if (tape->chrdev_direction != idetape_direction_write) { 3783 if (tape->chrdev_direction == idetape_direction_read) 3784 idetape_discard_read_pipeline(drive, 1); 3785#if IDETAPE_DEBUG_BUGS 3786 if (tape->merge_stage || tape->merge_stage_size) { 3787 printk(KERN_ERR "ide-tape: merge_stage_size " 3788 "should be 0 now\n"); 3789 tape->merge_stage_size = 0; 3790 } 3791#endif /* IDETAPE_DEBUG_BUGS */ 3792 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 3793 return -ENOMEM; 3794 tape->chrdev_direction = idetape_direction_write; 3795 idetape_init_merge_stage(tape); 3796 3797 /* 3798 * Issue a write 0 command to ensure that DSC handshake 3799 * is switched from completion mode to buffer available 3800 * mode. 3801 * No point in issuing this if DSC overlap isn't supported, 3802 * some drives (Seagate STT3401A) will return an error. 3803 */ 3804 if (drive->dsc_overlap) { 3805 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); 3806 if (retval < 0) { 3807 __idetape_kfree_stage(tape->merge_stage); 3808 tape->merge_stage = NULL; 3809 tape->chrdev_direction = idetape_direction_none; 3810 return retval; 3811 } 3812 } 3813 } 3814 if (count == 0) 3815 return (0); 3816 if (tape->restart_speed_control_req) 3817 idetape_restart_speed_control(drive); 3818 if (tape->merge_stage_size) { 3819#if IDETAPE_DEBUG_BUGS 3820 if (tape->merge_stage_size >= tape->stage_size) { 3821 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); 3822 tape->merge_stage_size = 0; 3823 } 3824#endif /* IDETAPE_DEBUG_BUGS */ 3825 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); 3826 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written)) 3827 ret = -EFAULT; 3828 buf += actually_written; 3829 tape->merge_stage_size += actually_written; 3830 count -= actually_written; 3831 3832 if (tape->merge_stage_size == tape->stage_size) { 3833 ssize_t retval; 3834 tape->merge_stage_size = 0; 3835 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); 3836 if (retval <= 0) 3837 return (retval); 3838 } 3839 } 3840 while (count >= tape->stage_size) { 3841 ssize_t retval; 3842 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size)) 3843 ret = -EFAULT; 3844 buf += tape->stage_size; 3845 count -= tape->stage_size; 3846 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); 3847 actually_written += tape->stage_size; 3848 if (retval <= 0) 3849 return (retval); 3850 } 3851 if (count) { 3852 actually_written += count; 3853 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count)) 3854 ret = -EFAULT; 3855 tape->merge_stage_size += count; 3856 } 3857 return (ret) ? ret : actually_written; 3858} 3859 3860static int idetape_write_filemark (ide_drive_t *drive) 3861{ 3862 idetape_pc_t pc; 3863 3864 /* Write a filemark */ 3865 idetape_create_write_filemark_cmd(drive, &pc, 1); 3866 if (idetape_queue_pc_tail(drive, &pc)) { 3867 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 3868 return -EIO; 3869 } 3870 return 0; 3871} 3872 3873/* 3874 * idetape_mtioctop is called from idetape_chrdev_ioctl when 3875 * the general mtio MTIOCTOP ioctl is requested. 3876 * 3877 * We currently support the following mtio.h operations: 3878 * 3879 * MTFSF - Space over mt_count filemarks in the positive direction. 3880 * The tape is positioned after the last spaced filemark. 3881 * 3882 * MTFSFM - Same as MTFSF, but the tape is positioned before the 3883 * last filemark. 3884 * 3885 * MTBSF - Steps background over mt_count filemarks, tape is 3886 * positioned before the last filemark. 3887 * 3888 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. 3889 * 3890 * Note: 3891 * 3892 * MTBSF and MTBSFM are not supported when the tape doesn't 3893 * support spacing over filemarks in the reverse direction. 3894 * In this case, MTFSFM is also usually not supported (it is 3895 * supported in the rare case in which we crossed the filemark 3896 * during our read-ahead pipelined operation mode). 3897 * 3898 * MTWEOF - Writes mt_count filemarks. Tape is positioned after 3899 * the last written filemark. 3900 * 3901 * MTREW - Rewinds tape. 3902 * 3903 * MTLOAD - Loads the tape. 3904 * 3905 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and 3906 * MTUNLOAD prevents further access until the media is replaced. 3907 * 3908 * MTNOP - Flushes tape buffers. 3909 * 3910 * MTRETEN - Retension media. This typically consists of one end 3911 * to end pass on the media. 3912 * 3913 * MTEOM - Moves to the end of recorded data. 3914 * 3915 * MTERASE - Erases tape. 3916 * 3917 * MTSETBLK - Sets the user block size to mt_count bytes. If 3918 * mt_count is 0, we will attempt to autodetect 3919 * the block size. 3920 * 3921 * MTSEEK - Positions the tape in a specific block number, where 3922 * each block is assumed to contain which user_block_size 3923 * bytes. 3924 * 3925 * MTSETPART - Switches to another tape partition. 3926 * 3927 * MTLOCK - Locks the tape door. 3928 * 3929 * MTUNLOCK - Unlocks the tape door. 3930 * 3931 * The following commands are currently not supported: 3932 * 3933 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, 3934 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. 3935 */ 3936static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) 3937{ 3938 idetape_tape_t *tape = drive->driver_data; 3939 idetape_pc_t pc; 3940 int i,retval; 3941 3942#if IDETAPE_DEBUG_LOG 3943 if (tape->debug_level >= 1) 3944 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " 3945 "mt_op=%d, mt_count=%d\n", mt_op, mt_count); 3946#endif /* IDETAPE_DEBUG_LOG */ 3947 /* 3948 * Commands which need our pipelined read-ahead stages. 3949 */ 3950 switch (mt_op) { 3951 case MTFSF: 3952 case MTFSFM: 3953 case MTBSF: 3954 case MTBSFM: 3955 if (!mt_count) 3956 return (0); 3957 return (idetape_space_over_filemarks(drive,mt_op,mt_count)); 3958 default: 3959 break; 3960 } 3961 switch (mt_op) { 3962 case MTWEOF: 3963 if (tape->write_prot) 3964 return -EACCES; 3965 idetape_discard_read_pipeline(drive, 1); 3966 for (i = 0; i < mt_count; i++) { 3967 retval = idetape_write_filemark(drive); 3968 if (retval) 3969 return retval; 3970 } 3971 return (0); 3972 case MTREW: 3973 idetape_discard_read_pipeline(drive, 0); 3974 if (idetape_rewind_tape(drive)) 3975 return -EIO; 3976 return 0; 3977 case MTLOAD: 3978 idetape_discard_read_pipeline(drive, 0); 3979 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 3980 return (idetape_queue_pc_tail(drive, &pc)); 3981 case MTUNLOAD: 3982 case MTOFFL: 3983 /* 3984 * If door is locked, attempt to unlock before 3985 * attempting to eject. 3986 */ 3987 if (tape->door_locked) { 3988 if (idetape_create_prevent_cmd(drive, &pc, 0)) 3989 if (!idetape_queue_pc_tail(drive, &pc)) 3990 tape->door_locked = DOOR_UNLOCKED; 3991 } 3992 idetape_discard_read_pipeline(drive, 0); 3993 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); 3994 retval = idetape_queue_pc_tail(drive, &pc); 3995 if (!retval) 3996 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 3997 return retval; 3998 case MTNOP: 3999 idetape_discard_read_pipeline(drive, 0); 4000 return (idetape_flush_tape_buffers(drive)); 4001 case MTRETEN: 4002 idetape_discard_read_pipeline(drive, 0); 4003 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 4004 return (idetape_queue_pc_tail(drive, &pc)); 4005 case MTEOM: 4006 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 4007 return (idetape_queue_pc_tail(drive, &pc)); 4008 case MTERASE: 4009 (void) idetape_rewind_tape(drive); 4010 idetape_create_erase_cmd(&pc); 4011 return (idetape_queue_pc_tail(drive, &pc)); 4012 case MTSETBLK: 4013 if (mt_count) { 4014 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) 4015 return -EIO; 4016 tape->user_bs_factor = mt_count / tape->tape_block_size; 4017 clear_bit(IDETAPE_DETECT_BS, &tape->flags); 4018 } else 4019 set_bit(IDETAPE_DETECT_BS, &tape->flags); 4020 return 0; 4021 case MTSEEK: 4022 idetape_discard_read_pipeline(drive, 0); 4023 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); 4024 case MTSETPART: 4025 idetape_discard_read_pipeline(drive, 0); 4026 return (idetape_position_tape(drive, 0, mt_count, 0)); 4027 case MTFSR: 4028 case MTBSR: 4029 case MTLOCK: 4030 if (!idetape_create_prevent_cmd(drive, &pc, 1)) 4031 return 0; 4032 retval = idetape_queue_pc_tail(drive, &pc); 4033 if (retval) return retval; 4034 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 4035 return 0; 4036 case MTUNLOCK: 4037 if (!idetape_create_prevent_cmd(drive, &pc, 0)) 4038 return 0; 4039 retval = idetape_queue_pc_tail(drive, &pc); 4040 if (retval) return retval; 4041 tape->door_locked = DOOR_UNLOCKED; 4042 return 0; 4043 default: 4044 printk(KERN_ERR "ide-tape: MTIO operation %d not " 4045 "supported\n", mt_op); 4046 return (-EIO); 4047 } 4048} 4049 4050/* 4051 * Our character device ioctls. 4052 * 4053 * General mtio.h magnetic io commands are supported here, and not in 4054 * the corresponding block interface. 4055 * 4056 * The following ioctls are supported: 4057 * 4058 * MTIOCTOP - Refer to idetape_mtioctop for detailed description. 4059 * 4060 * MTIOCGET - The mt_dsreg field in the returned mtget structure 4061 * will be set to (user block size in bytes << 4062 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. 4063 * 4064 * The mt_blkno is set to the current user block number. 4065 * The other mtget fields are not supported. 4066 * 4067 * MTIOCPOS - The current tape "block position" is returned. We 4068 * assume that each block contains user_block_size 4069 * bytes. 4070 * 4071 * Our own ide-tape ioctls are supported on both interfaces. 4072 */ 4073static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 4074{ 4075 struct ide_tape_obj *tape = ide_tape_f(file); 4076 ide_drive_t *drive = tape->drive; 4077 struct mtop mtop; 4078 struct mtget mtget; 4079 struct mtpos mtpos; 4080 int block_offset = 0, position = tape->first_frame_position; 4081 void __user *argp = (void __user *)arg; 4082 4083#if IDETAPE_DEBUG_LOG 4084 if (tape->debug_level >= 3) 4085 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " 4086 "cmd=%u\n", cmd); 4087#endif /* IDETAPE_DEBUG_LOG */ 4088 4089 tape->restart_speed_control_req = 1; 4090 if (tape->chrdev_direction == idetape_direction_write) { 4091 idetape_empty_write_pipeline(drive); 4092 idetape_flush_tape_buffers(drive); 4093 } 4094 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 4095 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); 4096 if ((position = idetape_read_position(drive)) < 0) 4097 return -EIO; 4098 } 4099 switch (cmd) { 4100 case MTIOCTOP: 4101 if (copy_from_user(&mtop, argp, sizeof (struct mtop))) 4102 return -EFAULT; 4103 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); 4104 case MTIOCGET: 4105 memset(&mtget, 0, sizeof (struct mtget)); 4106 mtget.mt_type = MT_ISSCSI2; 4107 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 4108 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 4109 if (tape->drv_write_prot) { 4110 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 4111 } 4112 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 4113 return -EFAULT; 4114 return 0; 4115 case MTIOCPOS: 4116 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 4117 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 4118 return -EFAULT; 4119 return 0; 4120 default: 4121 if (tape->chrdev_direction == idetape_direction_read) 4122 idetape_discard_read_pipeline(drive, 1); 4123 return idetape_blkdev_ioctl(drive, cmd, arg); 4124 } 4125} 4126 4127static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); 4128 4129/* 4130 * Our character device open function. 4131 */ 4132static int idetape_chrdev_open (struct inode *inode, struct file *filp) 4133{ 4134 unsigned int minor = iminor(inode), i = minor & ~0xc0; 4135 ide_drive_t *drive; 4136 idetape_tape_t *tape; 4137 idetape_pc_t pc; 4138 int retval; 4139 4140 /* 4141 * We really want to do nonseekable_open(inode, filp); here, but some 4142 * versions of tar incorrectly call lseek on tapes and bail out if that 4143 * fails. So we disallow pread() and pwrite(), but permit lseeks. 4144 */ 4145 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 4146 4147#if IDETAPE_DEBUG_LOG 4148 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); 4149#endif /* IDETAPE_DEBUG_LOG */ 4150 4151 if (i >= MAX_HWIFS * MAX_DRIVES) 4152 return -ENXIO; 4153 4154 if (!(tape = ide_tape_chrdev_get(i))) 4155 return -ENXIO; 4156 4157 drive = tape->drive; 4158 4159 filp->private_data = tape; 4160 4161 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { 4162 retval = -EBUSY; 4163 goto out_put_tape; 4164 } 4165 4166 retval = idetape_wait_ready(drive, 60 * HZ); 4167 if (retval) { 4168 clear_bit(IDETAPE_BUSY, &tape->flags); 4169 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 4170 goto out_put_tape; 4171 } 4172 4173 idetape_read_position(drive); 4174 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) 4175 (void)idetape_rewind_tape(drive); 4176 4177 if (tape->chrdev_direction != idetape_direction_read) 4178 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 4179 4180 /* Read block size and write protect status from drive. */ 4181 idetape_get_blocksize_from_block_descriptor(drive); 4182 4183 /* Set write protect flag if device is opened as read-only. */ 4184 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 4185 tape->write_prot = 1; 4186 else 4187 tape->write_prot = tape->drv_write_prot; 4188 4189 /* Make sure drive isn't write protected if user wants to write. */ 4190 if (tape->write_prot) { 4191 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 4192 (filp->f_flags & O_ACCMODE) == O_RDWR) { 4193 clear_bit(IDETAPE_BUSY, &tape->flags); 4194 retval = -EROFS; 4195 goto out_put_tape; 4196 } 4197 } 4198 4199 /* 4200 * Lock the tape drive door so user can't eject. 4201 */ 4202 if (tape->chrdev_direction == idetape_direction_none) { 4203 if (idetape_create_prevent_cmd(drive, &pc, 1)) { 4204 if (!idetape_queue_pc_tail(drive, &pc)) { 4205 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 4206 tape->door_locked = DOOR_LOCKED; 4207 } 4208 } 4209 } 4210 idetape_restart_speed_control(drive); 4211 tape->restart_speed_control_req = 0; 4212 return 0; 4213 4214out_put_tape: 4215 ide_tape_put(tape); 4216 return retval; 4217} 4218 4219static void idetape_write_release (ide_drive_t *drive, unsigned int minor) 4220{ 4221 idetape_tape_t *tape = drive->driver_data; 4222 4223 idetape_empty_write_pipeline(drive); 4224 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); 4225 if (tape->merge_stage != NULL) { 4226 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); 4227 __idetape_kfree_stage(tape->merge_stage); 4228 tape->merge_stage = NULL; 4229 } 4230 idetape_write_filemark(drive); 4231 idetape_flush_tape_buffers(drive); 4232 idetape_flush_tape_buffers(drive); 4233} 4234 4235/* 4236 * Our character device release function. 4237 */ 4238static int idetape_chrdev_release (struct inode *inode, struct file *filp) 4239{ 4240 struct ide_tape_obj *tape = ide_tape_f(filp); 4241 ide_drive_t *drive = tape->drive; 4242 idetape_pc_t pc; 4243 unsigned int minor = iminor(inode); 4244 4245 lock_kernel(); 4246 tape = drive->driver_data; 4247#if IDETAPE_DEBUG_LOG 4248 if (tape->debug_level >= 3) 4249 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); 4250#endif /* IDETAPE_DEBUG_LOG */ 4251 4252 if (tape->chrdev_direction == idetape_direction_write) 4253 idetape_write_release(drive, minor); 4254 if (tape->chrdev_direction == idetape_direction_read) { 4255 if (minor < 128) 4256 idetape_discard_read_pipeline(drive, 1); 4257 else 4258 idetape_wait_for_pipeline(drive); 4259 } 4260 if (tape->cache_stage != NULL) { 4261 __idetape_kfree_stage(tape->cache_stage); 4262 tape->cache_stage = NULL; 4263 } 4264 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) 4265 (void) idetape_rewind_tape(drive); 4266 if (tape->chrdev_direction == idetape_direction_none) { 4267 if (tape->door_locked == DOOR_LOCKED) { 4268 if (idetape_create_prevent_cmd(drive, &pc, 0)) { 4269 if (!idetape_queue_pc_tail(drive, &pc)) 4270 tape->door_locked = DOOR_UNLOCKED; 4271 } 4272 } 4273 } 4274 clear_bit(IDETAPE_BUSY, &tape->flags); 4275 ide_tape_put(tape); 4276 unlock_kernel(); 4277 return 0; 4278} 4279 4280/* 4281 * idetape_identify_device is called to check the contents of the 4282 * ATAPI IDENTIFY command results. We return: 4283 * 4284 * 1 If the tape can be supported by us, based on the information 4285 * we have so far. 4286 * 4287 * 0 If this tape driver is not currently supported by us. 4288 */ 4289static int idetape_identify_device (ide_drive_t *drive) 4290{ 4291 struct idetape_id_gcw gcw; 4292 struct hd_driveid *id = drive->id; 4293 4294 if (drive->id_read == 0) 4295 return 1; 4296 4297 *((unsigned short *) &gcw) = id->config; 4298 4299#if IDETAPE_DEBUG_INFO 4300 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); 4301 printk(KERN_INFO "ide-tape: Protocol Type: "); 4302 switch (gcw.protocol) { 4303 case 0: case 1: printk("ATA\n");break; 4304 case 2: printk("ATAPI\n");break; 4305 case 3: printk("Reserved (Unknown to ide-tape)\n");break; 4306 } 4307 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); 4308 switch (gcw.device_type) { 4309 case 0: printk("Direct-access Device\n");break; 4310 case 1: printk("Streaming Tape Device\n");break; 4311 case 2: case 3: case 4: printk("Reserved\n");break; 4312 case 5: printk("CD-ROM Device\n");break; 4313 case 6: printk("Reserved\n"); 4314 case 7: printk("Optical memory Device\n");break; 4315 case 0x1f: printk("Unknown or no Device type\n");break; 4316 default: printk("Reserved\n"); 4317 } 4318 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); 4319 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); 4320 switch (gcw.drq_type) { 4321 case 0: printk("Microprocessor DRQ\n");break; 4322 case 1: printk("Interrupt DRQ\n");break; 4323 case 2: printk("Accelerated DRQ\n");break; 4324 case 3: printk("Reserved\n");break; 4325 } 4326 printk(KERN_INFO "ide-tape: Command Packet Size: "); 4327 switch (gcw.packet_size) { 4328 case 0: printk("12 bytes\n");break; 4329 case 1: printk("16 bytes\n");break; 4330 default: printk("Reserved\n");break; 4331 } 4332#endif /* IDETAPE_DEBUG_INFO */ 4333 4334 /* Check that we can support this device */ 4335 4336 if (gcw.protocol !=2 ) 4337 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); 4338 else if (gcw.device_type != 1) 4339 printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); 4340 else if (!gcw.removable) 4341 printk(KERN_ERR "ide-tape: The removable flag is not set\n"); 4342 else if (gcw.packet_size != 0) { 4343 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); 4344 if (gcw.packet_size == 1) 4345 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); 4346 } else 4347 return 1; 4348 return 0; 4349} 4350 4351/* 4352 * Use INQUIRY to get the firmware revision 4353 */ 4354static void idetape_get_inquiry_results (ide_drive_t *drive) 4355{ 4356 char *r; 4357 idetape_tape_t *tape = drive->driver_data; 4358 idetape_pc_t pc; 4359 idetape_inquiry_result_t *inquiry; 4360 4361 idetape_create_inquiry_cmd(&pc); 4362 if (idetape_queue_pc_tail(drive, &pc)) { 4363 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); 4364 return; 4365 } 4366 inquiry = (idetape_inquiry_result_t *) pc.buffer; 4367 memcpy(tape->vendor_id, inquiry->vendor_id, 8); 4368 memcpy(tape->product_id, inquiry->product_id, 16); 4369 memcpy(tape->firmware_revision, inquiry->revision_level, 4); 4370 ide_fixstring(tape->vendor_id, 10, 0); 4371 ide_fixstring(tape->product_id, 18, 0); 4372 ide_fixstring(tape->firmware_revision, 6, 0); 4373 r = tape->firmware_revision; 4374 if (*(r + 1) == '.') 4375 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; 4376 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision); 4377} 4378 4379/* 4380 * idetape_get_mode_sense_results asks the tape about its various 4381 * parameters. In particular, we will adjust our data transfer buffer 4382 * size to the recommended value as returned by the tape. 4383 */ 4384static void idetape_get_mode_sense_results (ide_drive_t *drive) 4385{ 4386 idetape_tape_t *tape = drive->driver_data; 4387 idetape_pc_t pc; 4388 idetape_mode_parameter_header_t *header; 4389 idetape_capabilities_page_t *capabilities; 4390 4391 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 4392 if (idetape_queue_pc_tail(drive, &pc)) { 4393 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); 4394 tape->tape_block_size = 512; 4395 tape->capabilities.ctl = 52; 4396 tape->capabilities.speed = 450; 4397 tape->capabilities.buffer_size = 6 * 52; 4398 return; 4399 } 4400 header = (idetape_mode_parameter_header_t *) pc.buffer; 4401 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); 4402 4403 capabilities->max_speed = ntohs(capabilities->max_speed); 4404 capabilities->ctl = ntohs(capabilities->ctl); 4405 capabilities->speed = ntohs(capabilities->speed); 4406 capabilities->buffer_size = ntohs(capabilities->buffer_size); 4407 4408 if (!capabilities->speed) { 4409 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); 4410 capabilities->speed = 650; 4411 } 4412 if (!capabilities->max_speed) { 4413 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); 4414 capabilities->max_speed = 650; 4415 } 4416 4417 tape->capabilities = *capabilities; /* Save us a copy */ 4418 if (capabilities->blk512) 4419 tape->tape_block_size = 512; 4420 else if (capabilities->blk1024) 4421 tape->tape_block_size = 1024; 4422 4423#if IDETAPE_DEBUG_INFO 4424 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); 4425 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); 4426 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); 4427 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); 4428 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); 4429 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); 4430 4431 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); 4432 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); 4433 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); 4434 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); 4435 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); 4436 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); 4437 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); 4438 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); 4439 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); 4440 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); 4441 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); 4442 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); 4443 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); 4444 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); 4445 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); 4446 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); 4447 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); 4448 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); 4449 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); 4450 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); 4451#endif /* IDETAPE_DEBUG_INFO */ 4452} 4453 4454/* 4455 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor 4456 * and if it succeeds sets the tape block size with the reported value 4457 */ 4458static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) 4459{ 4460 4461 idetape_tape_t *tape = drive->driver_data; 4462 idetape_pc_t pc; 4463 idetape_mode_parameter_header_t *header; 4464 idetape_parameter_block_descriptor_t *block_descrp; 4465 4466 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 4467 if (idetape_queue_pc_tail(drive, &pc)) { 4468 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 4469 if (tape->tape_block_size == 0) { 4470 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); 4471 tape->tape_block_size = 32768; 4472 } 4473 return; 4474 } 4475 header = (idetape_mode_parameter_header_t *) pc.buffer; 4476 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); 4477 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; 4478 tape->drv_write_prot = (header->dsp & 0x80) >> 7; 4479 4480#if IDETAPE_DEBUG_INFO 4481 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); 4482#endif /* IDETAPE_DEBUG_INFO */ 4483} 4484 4485#ifdef CONFIG_IDE_PROC_FS 4486static void idetape_add_settings (ide_drive_t *drive) 4487{ 4488 idetape_tape_t *tape = drive->driver_data; 4489 4490/* 4491 * drive setting name read/write data type min max mul_factor div_factor data pointer set function 4492 */ 4493 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); 4494 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); 4495 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); 4496 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); 4497 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); 4498 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); 4499 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); 4500 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); 4501 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); 4502 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); 4503 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); 4504 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL); 4505 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); 4506 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); 4507} 4508#else 4509static inline void idetape_add_settings(ide_drive_t *drive) { ; } 4510#endif 4511 4512/* 4513 * ide_setup is called to: 4514 * 4515 * 1. Initialize our various state variables. 4516 * 2. Ask the tape for its capabilities. 4517 * 3. Allocate a buffer which will be used for data 4518 * transfer. The buffer size is chosen based on 4519 * the recommendation which we received in step (2). 4520 * 4521 * Note that at this point ide.c already assigned us an irq, so that 4522 * we can queue requests here and wait for their completion. 4523 */ 4524static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) 4525{ 4526 unsigned long t1, tmid, tn, t; 4527 int speed; 4528 struct idetape_id_gcw gcw; 4529 int stage_size; 4530 struct sysinfo si; 4531 4532 spin_lock_init(&tape->spinlock); 4533 drive->dsc_overlap = 1; 4534 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { 4535 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", 4536 tape->name); 4537 drive->dsc_overlap = 0; 4538 } 4539 /* Seagate Travan drives do not support DSC overlap. */ 4540 if (strstr(drive->id->model, "Seagate STT3401")) 4541 drive->dsc_overlap = 0; 4542 tape->minor = minor; 4543 tape->name[0] = 'h'; 4544 tape->name[1] = 't'; 4545 tape->name[2] = '0' + minor; 4546 tape->chrdev_direction = idetape_direction_none; 4547 tape->pc = tape->pc_stack; 4548 tape->max_insert_speed = 10000; 4549 tape->speed_control = 1; 4550 *((unsigned short *) &gcw) = drive->id->config; 4551 if (gcw.drq_type == 1) 4552 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); 4553 4554 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; 4555 4556 idetape_get_inquiry_results(drive); 4557 idetape_get_mode_sense_results(drive); 4558 idetape_get_blocksize_from_block_descriptor(drive); 4559 tape->user_bs_factor = 1; 4560 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 4561 while (tape->stage_size > 0xffff) { 4562 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 4563 tape->capabilities.ctl /= 2; 4564 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 4565 } 4566 stage_size = tape->stage_size; 4567 tape->pages_per_stage = stage_size / PAGE_SIZE; 4568 if (stage_size % PAGE_SIZE) { 4569 tape->pages_per_stage++; 4570 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; 4571 } 4572 4573 /* 4574 * Select the "best" DSC read/write polling frequency 4575 * and pipeline size. 4576 */ 4577 speed = max(tape->capabilities.speed, tape->capabilities.max_speed); 4578 4579 tape->max_stages = speed * 1000 * 10 / tape->stage_size; 4580 4581 /* 4582 * Limit memory use for pipeline to 10% of physical memory 4583 */ 4584 si_meminfo(&si); 4585 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) 4586 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); 4587 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); 4588 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); 4589 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); 4590 if (tape->max_stages == 0) 4591 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; 4592 4593 t1 = (tape->stage_size * HZ) / (speed * 1000); 4594 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); 4595 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); 4596 4597 if (tape->max_stages) 4598 t = tn; 4599 else 4600 t = t1; 4601 4602 /* 4603 * Ensure that the number we got makes sense; limit 4604 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 4605 */ 4606 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); 4607 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 4608 "%dkB pipeline, %lums tDSC%s\n", 4609 drive->name, tape->name, tape->capabilities.speed, 4610 (tape->capabilities.buffer_size * 512) / tape->stage_size, 4611 tape->stage_size / 1024, 4612 tape->max_stages * tape->stage_size / 1024, 4613 tape->best_dsc_rw_frequency * 1000 / HZ, 4614 drive->using_dma ? ", DMA":""); 4615 4616 idetape_add_settings(drive); 4617} 4618 4619static void ide_tape_remove(ide_drive_t *drive) 4620{ 4621 idetape_tape_t *tape = drive->driver_data; 4622 4623 ide_proc_unregister_driver(drive, tape->driver); 4624 4625 ide_unregister_region(tape->disk); 4626 4627 ide_tape_put(tape); 4628} 4629 4630static void ide_tape_release(struct kref *kref) 4631{ 4632 struct ide_tape_obj *tape = to_ide_tape(kref); 4633 ide_drive_t *drive = tape->drive; 4634 struct gendisk *g = tape->disk; 4635 4636 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); 4637 4638 drive->dsc_overlap = 0; 4639 drive->driver_data = NULL; 4640 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 4641 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 4642 idetape_devs[tape->minor] = NULL; 4643 g->private_data = NULL; 4644 put_disk(g); 4645 kfree(tape); 4646} 4647 4648#ifdef CONFIG_IDE_PROC_FS 4649static int proc_idetape_read_name 4650 (char *page, char **start, off_t off, int count, int *eof, void *data) 4651{ 4652 ide_drive_t *drive = (ide_drive_t *) data; 4653 idetape_tape_t *tape = drive->driver_data; 4654 char *out = page; 4655 int len; 4656 4657 len = sprintf(out, "%s\n", tape->name); 4658 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 4659} 4660 4661static ide_proc_entry_t idetape_proc[] = { 4662 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 4663 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 4664 { NULL, 0, NULL, NULL } 4665}; 4666#endif 4667 4668static int ide_tape_probe(ide_drive_t *); 4669 4670static ide_driver_t idetape_driver = { 4671 .gen_driver = { 4672 .owner = THIS_MODULE, 4673 .name = "ide-tape", 4674 .bus = &ide_bus_type, 4675 }, 4676 .probe = ide_tape_probe, 4677 .remove = ide_tape_remove, 4678 .version = IDETAPE_VERSION, 4679 .media = ide_tape, 4680 .supports_dsc_overlap = 1, 4681 .do_request = idetape_do_request, 4682 .end_request = idetape_end_request, 4683 .error = __ide_error, 4684 .abort = __ide_abort, 4685#ifdef CONFIG_IDE_PROC_FS 4686 .proc = idetape_proc, 4687#endif 4688}; 4689 4690/* 4691 * Our character device supporting functions, passed to register_chrdev. 4692 */ 4693static const struct file_operations idetape_fops = { 4694 .owner = THIS_MODULE, 4695 .read = idetape_chrdev_read, 4696 .write = idetape_chrdev_write, 4697 .ioctl = idetape_chrdev_ioctl, 4698 .open = idetape_chrdev_open, 4699 .release = idetape_chrdev_release, 4700}; 4701 4702static int idetape_open(struct inode *inode, struct file *filp) 4703{ 4704 struct gendisk *disk = inode->i_bdev->bd_disk; 4705 struct ide_tape_obj *tape; 4706 4707 if (!(tape = ide_tape_get(disk))) 4708 return -ENXIO; 4709 4710 return 0; 4711} 4712 4713static int idetape_release(struct inode *inode, struct file *filp) 4714{ 4715 struct gendisk *disk = inode->i_bdev->bd_disk; 4716 struct ide_tape_obj *tape = ide_tape_g(disk); 4717 4718 ide_tape_put(tape); 4719 4720 return 0; 4721} 4722 4723static int idetape_ioctl(struct inode *inode, struct file *file, 4724 unsigned int cmd, unsigned long arg) 4725{ 4726 struct block_device *bdev = inode->i_bdev; 4727 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); 4728 ide_drive_t *drive = tape->drive; 4729 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 4730 if (err == -EINVAL) 4731 err = idetape_blkdev_ioctl(drive, cmd, arg); 4732 return err; 4733} 4734 4735static struct block_device_operations idetape_block_ops = { 4736 .owner = THIS_MODULE, 4737 .open = idetape_open, 4738 .release = idetape_release, 4739 .ioctl = idetape_ioctl, 4740}; 4741 4742static int ide_tape_probe(ide_drive_t *drive) 4743{ 4744 idetape_tape_t *tape; 4745 struct gendisk *g; 4746 int minor; 4747 4748 if (!strstr("ide-tape", drive->driver_req)) 4749 goto failed; 4750 if (!drive->present) 4751 goto failed; 4752 if (drive->media != ide_tape) 4753 goto failed; 4754 if (!idetape_identify_device (drive)) { 4755 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); 4756 goto failed; 4757 } 4758 if (drive->scsi) { 4759 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); 4760 goto failed; 4761 } 4762 if (strstr(drive->id->model, "OnStream DI-")) { 4763 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); 4764 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); 4765 } 4766 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL); 4767 if (tape == NULL) { 4768 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); 4769 goto failed; 4770 } 4771 4772 g = alloc_disk(1 << PARTN_BITS); 4773 if (!g) 4774 goto out_free_tape; 4775 4776 ide_init_disk(g, drive); 4777 4778 ide_proc_register_driver(drive, &idetape_driver); 4779 4780 kref_init(&tape->kref); 4781 4782 tape->drive = drive; 4783 tape->driver = &idetape_driver; 4784 tape->disk = g; 4785 4786 g->private_data = &tape->driver; 4787 4788 drive->driver_data = tape; 4789 4790 mutex_lock(&idetape_ref_mutex); 4791 for (minor = 0; idetape_devs[minor]; minor++) 4792 ; 4793 idetape_devs[minor] = tape; 4794 mutex_unlock(&idetape_ref_mutex); 4795 4796 idetape_setup(drive, tape, minor); 4797 4798 device_create(idetape_sysfs_class, &drive->gendev, 4799 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); 4800 device_create(idetape_sysfs_class, &drive->gendev, 4801 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); 4802 4803 g->fops = &idetape_block_ops; 4804 ide_register_region(g); 4805 4806 return 0; 4807 4808out_free_tape: 4809 kfree(tape); 4810failed: 4811 return -ENODEV; 4812} 4813 4814MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 4815MODULE_LICENSE("GPL"); 4816 4817static void __exit idetape_exit (void) 4818{ 4819 driver_unregister(&idetape_driver.gen_driver); 4820 class_destroy(idetape_sysfs_class); 4821 unregister_chrdev(IDETAPE_MAJOR, "ht"); 4822} 4823 4824static int __init idetape_init(void) 4825{ 4826 int error = 1; 4827 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 4828 if (IS_ERR(idetape_sysfs_class)) { 4829 idetape_sysfs_class = NULL; 4830 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 4831 error = -EBUSY; 4832 goto out; 4833 } 4834 4835 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 4836 printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); 4837 error = -EBUSY; 4838 goto out_free_class; 4839 } 4840 4841 error = driver_register(&idetape_driver.gen_driver); 4842 if (error) 4843 goto out_free_driver; 4844 4845 return 0; 4846 4847out_free_driver: 4848 driver_unregister(&idetape_driver.gen_driver); 4849out_free_class: 4850 class_destroy(idetape_sysfs_class); 4851out: 4852 return error; 4853} 4854 4855MODULE_ALIAS("ide:*m-tape*"); 4856module_init(idetape_init); 4857module_exit(idetape_exit); 4858MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 4859