ide-tape.c revision 8e7657ae0f56c14882e53ffdae8055c2b1624de1
1/* 2 * linux/drivers/ide/ide-tape.c Version 1.19 Nov, 2003 3 * 4 * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il> 5 * 6 * $Header$ 7 * 8 * This driver was constructed as a student project in the software laboratory 9 * of the faculty of electrical engineering in the Technion - Israel's 10 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. 11 * 12 * It is hereby placed under the terms of the GNU general public license. 13 * (See linux/COPYING). 14 */ 15 16/* 17 * IDE ATAPI streaming tape driver. 18 * 19 * This driver is a part of the Linux ide driver and works in co-operation 20 * with linux/drivers/block/ide.c. 21 * 22 * The driver, in co-operation with ide.c, basically traverses the 23 * request-list for the block device interface. The character device 24 * interface, on the other hand, creates new requests, adds them 25 * to the request-list of the block device, and waits for their completion. 26 * 27 * Pipelined operation mode is now supported on both reads and writes. 28 * 29 * The block device major and minor numbers are determined from the 30 * tape's relative position in the ide interfaces, as explained in ide.c. 31 * 32 * The character device interface consists of the following devices: 33 * 34 * ht0 major 37, minor 0 first IDE tape, rewind on close. 35 * ht1 major 37, minor 1 second IDE tape, rewind on close. 36 * ... 37 * nht0 major 37, minor 128 first IDE tape, no rewind on close. 38 * nht1 major 37, minor 129 second IDE tape, no rewind on close. 39 * ... 40 * 41 * Run linux/scripts/MAKEDEV.ide to create the above entries. 42 * 43 * The general magnetic tape commands compatible interface, as defined by 44 * include/linux/mtio.h, is accessible through the character device. 45 * 46 * General ide driver configuration options, such as the interrupt-unmask 47 * flag, can be configured by issuing an ioctl to the block device interface, 48 * as any other ide device. 49 * 50 * Our own ide-tape ioctl's can be issued to either the block device or 51 * the character device interface. 52 * 53 * Maximal throughput with minimal bus load will usually be achieved in the 54 * following scenario: 55 * 56 * 1. ide-tape is operating in the pipelined operation mode. 57 * 2. No buffering is performed by the user backup program. 58 * 59 * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive. 60 * 61 * Ver 0.1 Nov 1 95 Pre-working code :-) 62 * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure 63 * was successful ! (Using tar cvf ... on the block 64 * device interface). 65 * A longer backup resulted in major swapping, bad 66 * overall Linux performance and eventually failed as 67 * we received non serial read-ahead requests from the 68 * buffer cache. 69 * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the 70 * character device interface. Linux's responsiveness 71 * and performance doesn't seem to be much affected 72 * from the background backup procedure. 73 * Some general mtio.h magnetic tape operations are 74 * now supported by our character device. As a result, 75 * popular tape utilities are starting to work with 76 * ide tapes :-) 77 * The following configurations were tested: 78 * 1. An IDE ATAPI TAPE shares the same interface 79 * and irq with an IDE ATAPI CDROM. 80 * 2. An IDE ATAPI TAPE shares the same interface 81 * and irq with a normal IDE disk. 82 * Both configurations seemed to work just fine ! 83 * However, to be on the safe side, it is meanwhile 84 * recommended to give the IDE TAPE its own interface 85 * and irq. 86 * The one thing which needs to be done here is to 87 * add a "request postpone" feature to ide.c, 88 * so that we won't have to wait for the tape to finish 89 * performing a long media access (DSC) request (such 90 * as a rewind) before we can access the other device 91 * on the same interface. This effect doesn't disturb 92 * normal operation most of the time because read/write 93 * requests are relatively fast, and once we are 94 * performing one tape r/w request, a lot of requests 95 * from the other device can be queued and ide.c will 96 * service all of them after this single tape request. 97 * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree. 98 * On each read / write request, we now ask the drive 99 * if we can transfer a constant number of bytes 100 * (a parameter of the drive) only to its buffers, 101 * without causing actual media access. If we can't, 102 * we just wait until we can by polling the DSC bit. 103 * This ensures that while we are not transferring 104 * more bytes than the constant referred to above, the 105 * interrupt latency will not become too high and 106 * we won't cause an interrupt timeout, as happened 107 * occasionally in the previous version. 108 * While polling for DSC, the current request is 109 * postponed and ide.c is free to handle requests from 110 * the other device. This is handled transparently to 111 * ide.c. The hwgroup locking method which was used 112 * in the previous version was removed. 113 * Use of new general features which are provided by 114 * ide.c for use with atapi devices. 115 * (Programming done by Mark Lord) 116 * Few potential bug fixes (Again, suggested by Mark) 117 * Single character device data transfers are now 118 * not limited in size, as they were before. 119 * We are asking the tape about its recommended 120 * transfer unit and send a larger data transfer 121 * as several transfers of the above size. 122 * For best results, use an integral number of this 123 * basic unit (which is shown during driver 124 * initialization). I will soon add an ioctl to get 125 * this important parameter. 126 * Our data transfer buffer is allocated on startup, 127 * rather than before each data transfer. This should 128 * ensure that we will indeed have a data buffer. 129 * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape 130 * shared an interface with another device. 131 * (poll_for_dsc was a complete mess). 132 * Removed some old (non-active) code which had 133 * to do with supporting buffer cache originated 134 * requests. 135 * The block device interface can now be opened, so 136 * that general ide driver features like the unmask 137 * interrupts flag can be selected with an ioctl. 138 * This is the only use of the block device interface. 139 * New fast pipelined operation mode (currently only on 140 * writes). When using the pipelined mode, the 141 * throughput can potentially reach the maximum 142 * tape supported throughput, regardless of the 143 * user backup program. On my tape drive, it sometimes 144 * boosted performance by a factor of 2. Pipelined 145 * mode is enabled by default, but since it has a few 146 * downfalls as well, you may want to disable it. 147 * A short explanation of the pipelined operation mode 148 * is available below. 149 * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition. 150 * Added pipeline read mode. As a result, restores 151 * are now as fast as backups. 152 * Optimized shared interface behavior. The new behavior 153 * typically results in better IDE bus efficiency and 154 * higher tape throughput. 155 * Pre-calculation of the expected read/write request 156 * service time, based on the tape's parameters. In 157 * the pipelined operation mode, this allows us to 158 * adjust our polling frequency to a much lower value, 159 * and thus to dramatically reduce our load on Linux, 160 * without any decrease in performance. 161 * Implemented additional mtio.h operations. 162 * The recommended user block size is returned by 163 * the MTIOCGET ioctl. 164 * Additional minor changes. 165 * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the 166 * use of some block sizes during a restore procedure. 167 * The character device interface will now present a 168 * continuous view of the media - any mix of block sizes 169 * during a backup/restore procedure is supported. The 170 * driver will buffer the requests internally and 171 * convert them to the tape's recommended transfer 172 * unit, making performance almost independent of the 173 * chosen user block size. 174 * Some improvements in error recovery. 175 * By cooperating with ide-dma.c, bus mastering DMA can 176 * now sometimes be used with IDE tape drives as well. 177 * Bus mastering DMA has the potential to dramatically 178 * reduce the CPU's overhead when accessing the device, 179 * and can be enabled by using hdparm -d1 on the tape's 180 * block device interface. For more info, read the 181 * comments in ide-dma.c. 182 * Ver 1.4 Mar 13 96 Fixed serialize support. 183 * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85. 184 * Fixed pipelined read mode inefficiency. 185 * Fixed nasty null dereferencing bug. 186 * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver. 187 * Fixed end of media bug. 188 * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model. 189 * Ver 1.8 Sep 26 96 Attempt to find a better balance between good 190 * interactive response and high system throughput. 191 * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather 192 * than requiring an explicit FSF command. 193 * Abort pending requests at end of media. 194 * MTTELL was sometimes returning incorrect results. 195 * Return the real block size in the MTIOCGET ioctl. 196 * Some error recovery bug fixes. 197 * Ver 1.10 Nov 5 96 Major reorganization. 198 * Reduced CPU overhead a bit by eliminating internal 199 * bounce buffers. 200 * Added module support. 201 * Added multiple tape drives support. 202 * Added partition support. 203 * Rewrote DSC handling. 204 * Some portability fixes. 205 * Removed ide-tape.h. 206 * Additional minor changes. 207 * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling. 208 * Use ide_stall_queue() for DSC overlap. 209 * Use the maximum speed rather than the current speed 210 * to compute the request service time. 211 * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data 212 * corruption, which could occur if the total number 213 * of bytes written to the tape was not an integral 214 * number of tape blocks. 215 * Add support for INTERRUPT DRQ devices. 216 * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB 217 * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives. 218 * Replace cli()/sti() with hwgroup spinlocks. 219 * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup 220 * spinlock with private per-tape spinlock. 221 * Ver 1.16 Sep 1 99 Add OnStream tape support. 222 * Abort read pipeline on EOD. 223 * Wait for the tape to become ready in case it returns 224 * "in the process of becoming ready" on open(). 225 * Fix zero padding of the last written block in 226 * case the tape block size is larger than PAGE_SIZE. 227 * Decrease the default disconnection time to tn. 228 * Ver 1.16e Oct 3 99 Minor fixes. 229 * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen, 230 * niessen@iae.nl / arnold.niessen@philips.com 231 * GO-1) Undefined code in idetape_read_position 232 * according to Gadi's email 233 * AJN-1) Minor fix asc == 11 should be asc == 0x11 234 * in idetape_issue_packet_command (did effect 235 * debugging output only) 236 * AJN-2) Added more debugging output, and 237 * added ide-tape: where missing. I would also 238 * like to add tape->name where possible 239 * AJN-3) Added different debug_level's 240 * via /proc/ide/hdc/settings 241 * "debug_level" determines amount of debugging output; 242 * can be changed using /proc/ide/hdx/settings 243 * 0 : almost no debugging output 244 * 1 : 0+output errors only 245 * 2 : 1+output all sensekey/asc 246 * 3 : 2+follow all chrdev related procedures 247 * 4 : 3+follow all procedures 248 * 5 : 4+include pc_stack rq_stack info 249 * 6 : 5+USE_COUNT updates 250 * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail 251 * from 5 to 10 minutes 252 * AJN-5) Changed maximum number of blocks to skip when 253 * reading tapes with multiple consecutive write 254 * errors from 100 to 1000 in idetape_get_logical_blk 255 * Proposed changes to code: 256 * 1) output "logical_blk_num" via /proc 257 * 2) output "current_operation" via /proc 258 * 3) Either solve or document the fact that `mt rewind' is 259 * required after reading from /dev/nhtx to be 260 * able to rmmod the idetape module; 261 * Also, sometimes an application finishes but the 262 * device remains `busy' for some time. Same cause ? 263 * Proposed changes to release-notes: 264 * 4) write a simple `quickstart' section in the 265 * release notes; I volunteer if you don't want to 266 * 5) include a pointer to video4linux in the doc 267 * to stimulate video applications 268 * 6) release notes lines 331 and 362: explain what happens 269 * if the application data rate is higher than 1100 KB/s; 270 * similar approach to lower-than-500 kB/s ? 271 * 7) 6.6 Comparison; wouldn't it be better to allow different 272 * strategies for read and write ? 273 * Wouldn't it be better to control the tape buffer 274 * contents instead of the bandwidth ? 275 * 8) line 536: replace will by would (if I understand 276 * this section correctly, a hypothetical and unwanted situation 277 * is being described) 278 * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames. 279 * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl 280 * - Add idetape_onstream_mode_sense_tape_parameter_page 281 * function to get tape capacity in frames: tape->capacity. 282 * - Add support for DI-50 drives( or any DI- drive). 283 * - 'workaround' for read error/blank block around block 3000. 284 * - Implement Early warning for end of media for Onstream. 285 * - Cosmetic code changes for readability. 286 * - Idetape_position_tape should not use SKIP bit during 287 * Onstream read recovery. 288 * - Add capacity, logical_blk_num and first/last_frame_position 289 * to /proc/ide/hd?/settings. 290 * - Module use count was gone in the Linux 2.4 driver. 291 * Ver 1.17a Apr 2001 Willem Riede osst@riede.org 292 * - Get drive's actual block size from mode sense block descriptor 293 * - Limit size of pipeline 294 * Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu> 295 * Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used 296 * it in the code! 297 * Actually removed aborted stages in idetape_abort_pipeline 298 * instead of just changing the command code. 299 * Made the transfer byte count for Request Sense equal to the 300 * actual length of the data transfer. 301 * Changed handling of partial data transfers: they do not 302 * cause DMA errors. 303 * Moved initiation of DMA transfers to the correct place. 304 * Removed reference to unallocated memory. 305 * Made __idetape_discard_read_pipeline return the number of 306 * sectors skipped, not the number of stages. 307 * Replaced errant kfree() calls with __idetape_kfree_stage(). 308 * Fixed off-by-one error in testing the pipeline length. 309 * Fixed handling of filemarks in the read pipeline. 310 * Small code optimization for MTBSF and MTBSFM ioctls. 311 * Don't try to unlock the door during device close if is 312 * already unlocked! 313 * Cosmetic fixes to miscellaneous debugging output messages. 314 * Set the minimum /proc/ide/hd?/settings values for "pipeline", 315 * "pipeline_min", and "pipeline_max" to 1. 316 * 317 * Here are some words from the first releases of hd.c, which are quoted 318 * in ide.c and apply here as well: 319 * 320 * | Special care is recommended. Have Fun! 321 * 322 */ 323 324/* 325 * An overview of the pipelined operation mode. 326 * 327 * In the pipelined write mode, we will usually just add requests to our 328 * pipeline and return immediately, before we even start to service them. The 329 * user program will then have enough time to prepare the next request while 330 * we are still busy servicing previous requests. In the pipelined read mode, 331 * the situation is similar - we add read-ahead requests into the pipeline, 332 * before the user even requested them. 333 * 334 * The pipeline can be viewed as a "safety net" which will be activated when 335 * the system load is high and prevents the user backup program from keeping up 336 * with the current tape speed. At this point, the pipeline will get 337 * shorter and shorter but the tape will still be streaming at the same speed. 338 * Assuming we have enough pipeline stages, the system load will hopefully 339 * decrease before the pipeline is completely empty, and the backup program 340 * will be able to "catch up" and refill the pipeline again. 341 * 342 * When using the pipelined mode, it would be best to disable any type of 343 * buffering done by the user program, as ide-tape already provides all the 344 * benefits in the kernel, where it can be done in a more efficient way. 345 * As we will usually not block the user program on a request, the most 346 * efficient user code will then be a simple read-write-read-... cycle. 347 * Any additional logic will usually just slow down the backup process. 348 * 349 * Using the pipelined mode, I get a constant over 400 KBps throughput, 350 * which seems to be the maximum throughput supported by my tape. 351 * 352 * However, there are some downfalls: 353 * 354 * 1. We use memory (for data buffers) in proportional to the number 355 * of pipeline stages (each stage is about 26 KB with my tape). 356 * 2. In the pipelined write mode, we cheat and postpone error codes 357 * to the user task. In read mode, the actual tape position 358 * will be a bit further than the last requested block. 359 * 360 * Concerning (1): 361 * 362 * 1. We allocate stages dynamically only when we need them. When 363 * we don't need them, we don't consume additional memory. In 364 * case we can't allocate stages, we just manage without them 365 * (at the expense of decreased throughput) so when Linux is 366 * tight in memory, we will not pose additional difficulties. 367 * 368 * 2. The maximum number of stages (which is, in fact, the maximum 369 * amount of memory) which we allocate is limited by the compile 370 * time parameter IDETAPE_MAX_PIPELINE_STAGES. 371 * 372 * 3. The maximum number of stages is a controlled parameter - We 373 * don't start from the user defined maximum number of stages 374 * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we 375 * will not even allocate this amount of stages if the user 376 * program can't handle the speed). We then implement a feedback 377 * loop which checks if the pipeline is empty, and if it is, we 378 * increase the maximum number of stages as necessary until we 379 * reach the optimum value which just manages to keep the tape 380 * busy with minimum allocated memory or until we reach 381 * IDETAPE_MAX_PIPELINE_STAGES. 382 * 383 * Concerning (2): 384 * 385 * In pipelined write mode, ide-tape can not return accurate error codes 386 * to the user program since we usually just add the request to the 387 * pipeline without waiting for it to be serviced. In case an error 388 * occurs, I will report it on the next user request. 389 * 390 * In the pipelined read mode, subsequent read requests or forward 391 * filemark spacing will perform correctly, as we preserve all blocks 392 * and filemarks which we encountered during our excess read-ahead. 393 * 394 * For accurate tape positioning and error reporting, disabling 395 * pipelined mode might be the best option. 396 * 397 * You can enable/disable/tune the pipelined operation mode by adjusting 398 * the compile time parameters below. 399 */ 400 401/* 402 * Possible improvements. 403 * 404 * 1. Support for the ATAPI overlap protocol. 405 * 406 * In order to maximize bus throughput, we currently use the DSC 407 * overlap method which enables ide.c to service requests from the 408 * other device while the tape is busy executing a command. The 409 * DSC overlap method involves polling the tape's status register 410 * for the DSC bit, and servicing the other device while the tape 411 * isn't ready. 412 * 413 * In the current QIC development standard (December 1995), 414 * it is recommended that new tape drives will *in addition* 415 * implement the ATAPI overlap protocol, which is used for the 416 * same purpose - efficient use of the IDE bus, but is interrupt 417 * driven and thus has much less CPU overhead. 418 * 419 * ATAPI overlap is likely to be supported in most new ATAPI 420 * devices, including new ATAPI cdroms, and thus provides us 421 * a method by which we can achieve higher throughput when 422 * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. 423 */ 424 425#define IDETAPE_VERSION "1.19" 426 427#include <linux/module.h> 428#include <linux/types.h> 429#include <linux/string.h> 430#include <linux/kernel.h> 431#include <linux/delay.h> 432#include <linux/timer.h> 433#include <linux/mm.h> 434#include <linux/interrupt.h> 435#include <linux/jiffies.h> 436#include <linux/major.h> 437#include <linux/errno.h> 438#include <linux/genhd.h> 439#include <linux/slab.h> 440#include <linux/pci.h> 441#include <linux/ide.h> 442#include <linux/smp_lock.h> 443#include <linux/completion.h> 444#include <linux/bitops.h> 445#include <linux/mutex.h> 446 447#include <asm/byteorder.h> 448#include <asm/irq.h> 449#include <asm/uaccess.h> 450#include <asm/io.h> 451#include <asm/unaligned.h> 452 453/* 454 * partition 455 */ 456typedef struct os_partition_s { 457 __u8 partition_num; 458 __u8 par_desc_ver; 459 __u16 wrt_pass_cntr; 460 __u32 first_frame_addr; 461 __u32 last_frame_addr; 462 __u32 eod_frame_addr; 463} os_partition_t; 464 465/* 466 * DAT entry 467 */ 468typedef struct os_dat_entry_s { 469 __u32 blk_sz; 470 __u16 blk_cnt; 471 __u8 flags; 472 __u8 reserved; 473} os_dat_entry_t; 474 475/* 476 * DAT 477 */ 478#define OS_DAT_FLAGS_DATA (0xc) 479#define OS_DAT_FLAGS_MARK (0x1) 480 481typedef struct os_dat_s { 482 __u8 dat_sz; 483 __u8 reserved1; 484 __u8 entry_cnt; 485 __u8 reserved3; 486 os_dat_entry_t dat_list[16]; 487} os_dat_t; 488 489#include <linux/mtio.h> 490 491/**************************** Tunable parameters *****************************/ 492 493 494/* 495 * Pipelined mode parameters. 496 * 497 * We try to use the minimum number of stages which is enough to 498 * keep the tape constantly streaming. To accomplish that, we implement 499 * a feedback loop around the maximum number of stages: 500 * 501 * We start from MIN maximum stages (we will not even use MIN stages 502 * if we don't need them), increment it by RATE*(MAX-MIN) 503 * whenever we sense that the pipeline is empty, until we reach 504 * the optimum value or until we reach MAX. 505 * 506 * Setting the following parameter to 0 is illegal: the pipelined mode 507 * cannot be disabled (calculate_speeds() divides by tape->max_stages.) 508 */ 509#define IDETAPE_MIN_PIPELINE_STAGES 1 510#define IDETAPE_MAX_PIPELINE_STAGES 400 511#define IDETAPE_INCREASE_STAGES_RATE 20 512 513/* 514 * The following are used to debug the driver: 515 * 516 * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. 517 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. 518 * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in 519 * some places. 520 * 521 * Setting them to 0 will restore normal operation mode: 522 * 523 * 1. Disable logging normal successful operations. 524 * 2. Disable self-sanity checks. 525 * 3. Errors will still be logged, of course. 526 * 527 * All the #if DEBUG code will be removed some day, when the driver 528 * is verified to be stable enough. This will make it much more 529 * esthetic. 530 */ 531#define IDETAPE_DEBUG_INFO 0 532#define IDETAPE_DEBUG_LOG 0 533#define IDETAPE_DEBUG_BUGS 1 534 535/* 536 * After each failed packet command we issue a request sense command 537 * and retry the packet command IDETAPE_MAX_PC_RETRIES times. 538 * 539 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. 540 */ 541#define IDETAPE_MAX_PC_RETRIES 3 542 543/* 544 * With each packet command, we allocate a buffer of 545 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet 546 * commands (Not for READ/WRITE commands). 547 */ 548#define IDETAPE_PC_BUFFER_SIZE 256 549 550/* 551 * In various places in the driver, we need to allocate storage 552 * for packet commands and requests, which will remain valid while 553 * we leave the driver to wait for an interrupt or a timeout event. 554 */ 555#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) 556 557/* 558 * Some drives (for example, Seagate STT3401A Travan) require a very long 559 * timeout, because they don't return an interrupt or clear their busy bit 560 * until after the command completes (even retension commands). 561 */ 562#define IDETAPE_WAIT_CMD (900*HZ) 563 564/* 565 * The following parameter is used to select the point in the internal 566 * tape fifo in which we will start to refill the buffer. Decreasing 567 * the following parameter will improve the system's latency and 568 * interactive response, while using a high value might improve system 569 * throughput. 570 */ 571#define IDETAPE_FIFO_THRESHOLD 2 572 573/* 574 * DSC polling parameters. 575 * 576 * Polling for DSC (a single bit in the status register) is a very 577 * important function in ide-tape. There are two cases in which we 578 * poll for DSC: 579 * 580 * 1. Before a read/write packet command, to ensure that we 581 * can transfer data from/to the tape's data buffers, without 582 * causing an actual media access. In case the tape is not 583 * ready yet, we take out our request from the device 584 * request queue, so that ide.c will service requests from 585 * the other device on the same interface meanwhile. 586 * 587 * 2. After the successful initialization of a "media access 588 * packet command", which is a command which can take a long 589 * time to complete (it can be several seconds or even an hour). 590 * 591 * Again, we postpone our request in the middle to free the bus 592 * for the other device. The polling frequency here should be 593 * lower than the read/write frequency since those media access 594 * commands are slow. We start from a "fast" frequency - 595 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC 596 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a 597 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). 598 * 599 * We also set a timeout for the timer, in case something goes wrong. 600 * The timeout should be longer then the maximum execution time of a 601 * tape operation. 602 */ 603 604/* 605 * DSC timings. 606 */ 607#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ 608#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ 609#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ 610#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ 611#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ 612#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ 613#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ 614 615/*************************** End of tunable parameters ***********************/ 616 617/* 618 * Read/Write error simulation 619 */ 620#define SIMULATE_ERRORS 0 621 622/* 623 * For general magnetic tape device compatibility. 624 */ 625typedef enum { 626 idetape_direction_none, 627 idetape_direction_read, 628 idetape_direction_write 629} idetape_chrdev_direction_t; 630 631struct idetape_bh { 632 u32 b_size; 633 atomic_t b_count; 634 struct idetape_bh *b_reqnext; 635 char *b_data; 636}; 637 638/* 639 * Our view of a packet command. 640 */ 641typedef struct idetape_packet_command_s { 642 u8 c[12]; /* Actual packet bytes */ 643 int retries; /* On each retry, we increment retries */ 644 int error; /* Error code */ 645 int request_transfer; /* Bytes to transfer */ 646 int actually_transferred; /* Bytes actually transferred */ 647 int buffer_size; /* Size of our data buffer */ 648 struct idetape_bh *bh; 649 char *b_data; 650 int b_count; 651 u8 *buffer; /* Data buffer */ 652 u8 *current_position; /* Pointer into the above buffer */ 653 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ 654 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ 655 unsigned long flags; /* Status/Action bit flags: long for set_bit */ 656} idetape_pc_t; 657 658/* 659 * Packet command flag bits. 660 */ 661/* Set when an error is considered normal - We won't retry */ 662#define PC_ABORT 0 663/* 1 When polling for DSC on a media access command */ 664#define PC_WAIT_FOR_DSC 1 665/* 1 when we prefer to use DMA if possible */ 666#define PC_DMA_RECOMMENDED 2 667/* 1 while DMA in progress */ 668#define PC_DMA_IN_PROGRESS 3 669/* 1 when encountered problem during DMA */ 670#define PC_DMA_ERROR 4 671/* Data direction */ 672#define PC_WRITING 5 673 674/* 675 * Capabilities and Mechanical Status Page 676 */ 677typedef struct { 678 unsigned page_code :6; /* Page code - Should be 0x2a */ 679 __u8 reserved0_6 :1; 680 __u8 ps :1; /* parameters saveable */ 681 __u8 page_length; /* Page Length - Should be 0x12 */ 682 __u8 reserved2, reserved3; 683 unsigned ro :1; /* Read Only Mode */ 684 unsigned reserved4_1234 :4; 685 unsigned sprev :1; /* Supports SPACE in the reverse direction */ 686 unsigned reserved4_67 :2; 687 unsigned reserved5_012 :3; 688 unsigned efmt :1; /* Supports ERASE command initiated formatting */ 689 unsigned reserved5_4 :1; 690 unsigned qfa :1; /* Supports the QFA two partition formats */ 691 unsigned reserved5_67 :2; 692 unsigned lock :1; /* Supports locking the volume */ 693 unsigned locked :1; /* The volume is locked */ 694 unsigned prevent :1; /* The device defaults in the prevent state after power up */ 695 unsigned eject :1; /* The device can eject the volume */ 696 __u8 disconnect :1; /* The device can break request > ctl */ 697 __u8 reserved6_5 :1; 698 unsigned ecc :1; /* Supports error correction */ 699 unsigned cmprs :1; /* Supports data compression */ 700 unsigned reserved7_0 :1; 701 unsigned blk512 :1; /* Supports 512 bytes block size */ 702 unsigned blk1024 :1; /* Supports 1024 bytes block size */ 703 unsigned reserved7_3_6 :4; 704 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ 705 /* transfers for slow buffer memory ??? */ 706 /* Also 32768 block size in some cases */ 707 __u16 max_speed; /* Maximum speed supported in KBps */ 708 __u8 reserved10, reserved11; 709 __u16 ctl; /* Continuous Transfer Limit in blocks */ 710 __u16 speed; /* Current Speed, in KBps */ 711 __u16 buffer_size; /* Buffer Size, in 512 bytes */ 712 __u8 reserved18, reserved19; 713} idetape_capabilities_page_t; 714 715/* 716 * Block Size Page 717 */ 718typedef struct { 719 unsigned page_code :6; /* Page code - Should be 0x30 */ 720 unsigned reserved1_6 :1; 721 unsigned ps :1; 722 __u8 page_length; /* Page Length - Should be 2 */ 723 __u8 reserved2; 724 unsigned play32 :1; 725 unsigned play32_5 :1; 726 unsigned reserved2_23 :2; 727 unsigned record32 :1; 728 unsigned record32_5 :1; 729 unsigned reserved2_6 :1; 730 unsigned one :1; 731} idetape_block_size_page_t; 732 733/* 734 * A pipeline stage. 735 */ 736typedef struct idetape_stage_s { 737 struct request rq; /* The corresponding request */ 738 struct idetape_bh *bh; /* The data buffers */ 739 struct idetape_stage_s *next; /* Pointer to the next stage */ 740} idetape_stage_t; 741 742/* 743 * REQUEST SENSE packet command result - Data Format. 744 */ 745typedef struct { 746 unsigned error_code :7; /* Current of deferred errors */ 747 unsigned valid :1; /* The information field conforms to QIC-157C */ 748 __u8 reserved1 :8; /* Segment Number - Reserved */ 749 unsigned sense_key :4; /* Sense Key */ 750 unsigned reserved2_4 :1; /* Reserved */ 751 unsigned ili :1; /* Incorrect Length Indicator */ 752 unsigned eom :1; /* End Of Medium */ 753 unsigned filemark :1; /* Filemark */ 754 __u32 information __attribute__ ((packed)); 755 __u8 asl; /* Additional sense length (n-7) */ 756 __u32 command_specific; /* Additional command specific information */ 757 __u8 asc; /* Additional Sense Code */ 758 __u8 ascq; /* Additional Sense Code Qualifier */ 759 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ 760 unsigned sk_specific1 :7; /* Sense Key Specific */ 761 unsigned sksv :1; /* Sense Key Specific information is valid */ 762 __u8 sk_specific2; /* Sense Key Specific */ 763 __u8 sk_specific3; /* Sense Key Specific */ 764 __u8 pad[2]; /* Padding to 20 bytes */ 765} idetape_request_sense_result_t; 766 767 768/* 769 * Most of our global data which we need to save even as we leave the 770 * driver due to an interrupt or a timer event is stored in a variable 771 * of type idetape_tape_t, defined below. 772 */ 773typedef struct ide_tape_obj { 774 ide_drive_t *drive; 775 ide_driver_t *driver; 776 struct gendisk *disk; 777 struct kref kref; 778 779 /* 780 * Since a typical character device operation requires more 781 * than one packet command, we provide here enough memory 782 * for the maximum of interconnected packet commands. 783 * The packet commands are stored in the circular array pc_stack. 784 * pc_stack_index points to the last used entry, and warps around 785 * to the start when we get to the last array entry. 786 * 787 * pc points to the current processed packet command. 788 * 789 * failed_pc points to the last failed packet command, or contains 790 * NULL if we do not need to retry any packet command. This is 791 * required since an additional packet command is needed before the 792 * retry, to get detailed information on what went wrong. 793 */ 794 /* Current packet command */ 795 idetape_pc_t *pc; 796 /* Last failed packet command */ 797 idetape_pc_t *failed_pc; 798 /* Packet command stack */ 799 idetape_pc_t pc_stack[IDETAPE_PC_STACK]; 800 /* Next free packet command storage space */ 801 int pc_stack_index; 802 struct request rq_stack[IDETAPE_PC_STACK]; 803 /* We implement a circular array */ 804 int rq_stack_index; 805 806 /* 807 * DSC polling variables. 808 * 809 * While polling for DSC we use postponed_rq to postpone the 810 * current request so that ide.c will be able to service 811 * pending requests on the other device. Note that at most 812 * we will have only one DSC (usually data transfer) request 813 * in the device request queue. Additional requests can be 814 * queued in our internal pipeline, but they will be visible 815 * to ide.c only one at a time. 816 */ 817 struct request *postponed_rq; 818 /* The time in which we started polling for DSC */ 819 unsigned long dsc_polling_start; 820 /* Timer used to poll for dsc */ 821 struct timer_list dsc_timer; 822 /* Read/Write dsc polling frequency */ 823 unsigned long best_dsc_rw_frequency; 824 /* The current polling frequency */ 825 unsigned long dsc_polling_frequency; 826 /* Maximum waiting time */ 827 unsigned long dsc_timeout; 828 829 /* 830 * Read position information 831 */ 832 u8 partition; 833 /* Current block */ 834 unsigned int first_frame_position; 835 unsigned int last_frame_position; 836 unsigned int blocks_in_buffer; 837 838 /* 839 * Last error information 840 */ 841 u8 sense_key, asc, ascq; 842 843 /* 844 * Character device operation 845 */ 846 unsigned int minor; 847 /* device name */ 848 char name[4]; 849 /* Current character device data transfer direction */ 850 idetape_chrdev_direction_t chrdev_direction; 851 852 /* 853 * Device information 854 */ 855 /* Usually 512 or 1024 bytes */ 856 unsigned short tape_block_size; 857 int user_bs_factor; 858 /* Copy of the tape's Capabilities and Mechanical Page */ 859 idetape_capabilities_page_t capabilities; 860 861 /* 862 * Active data transfer request parameters. 863 * 864 * At most, there is only one ide-tape originated data transfer 865 * request in the device request queue. This allows ide.c to 866 * easily service requests from the other device when we 867 * postpone our active request. In the pipelined operation 868 * mode, we use our internal pipeline structure to hold 869 * more data requests. 870 * 871 * The data buffer size is chosen based on the tape's 872 * recommendation. 873 */ 874 /* Pointer to the request which is waiting in the device request queue */ 875 struct request *active_data_request; 876 /* Data buffer size (chosen based on the tape's recommendation */ 877 int stage_size; 878 idetape_stage_t *merge_stage; 879 int merge_stage_size; 880 struct idetape_bh *bh; 881 char *b_data; 882 int b_count; 883 884 /* 885 * Pipeline parameters. 886 * 887 * To accomplish non-pipelined mode, we simply set the following 888 * variables to zero (or NULL, where appropriate). 889 */ 890 /* Number of currently used stages */ 891 int nr_stages; 892 /* Number of pending stages */ 893 int nr_pending_stages; 894 /* We will not allocate more than this number of stages */ 895 int max_stages, min_pipeline, max_pipeline; 896 /* The first stage which will be removed from the pipeline */ 897 idetape_stage_t *first_stage; 898 /* The currently active stage */ 899 idetape_stage_t *active_stage; 900 /* Will be serviced after the currently active request */ 901 idetape_stage_t *next_stage; 902 /* New requests will be added to the pipeline here */ 903 idetape_stage_t *last_stage; 904 /* Optional free stage which we can use */ 905 idetape_stage_t *cache_stage; 906 int pages_per_stage; 907 /* Wasted space in each stage */ 908 int excess_bh_size; 909 910 /* Status/Action flags: long for set_bit */ 911 unsigned long flags; 912 /* protects the ide-tape queue */ 913 spinlock_t spinlock; 914 915 /* 916 * Measures average tape speed 917 */ 918 unsigned long avg_time; 919 int avg_size; 920 int avg_speed; 921 922 /* last sense information */ 923 idetape_request_sense_result_t sense; 924 925 char vendor_id[10]; 926 char product_id[18]; 927 char firmware_revision[6]; 928 int firmware_revision_num; 929 930 /* the door is currently locked */ 931 int door_locked; 932 /* the tape hardware is write protected */ 933 char drv_write_prot; 934 /* the tape is write protected (hardware or opened as read-only) */ 935 char write_prot; 936 937 /* 938 * Limit the number of times a request can 939 * be postponed, to avoid an infinite postpone 940 * deadlock. 941 */ 942 /* request postpone count limit */ 943 int postpone_cnt; 944 945 /* 946 * Measures number of frames: 947 * 948 * 1. written/read to/from the driver pipeline (pipeline_head). 949 * 2. written/read to/from the tape buffers (idetape_bh). 950 * 3. written/read by the tape to/from the media (tape_head). 951 */ 952 int pipeline_head; 953 int buffer_head; 954 int tape_head; 955 int last_tape_head; 956 957 /* 958 * Speed control at the tape buffers input/output 959 */ 960 unsigned long insert_time; 961 int insert_size; 962 int insert_speed; 963 int max_insert_speed; 964 int measure_insert_time; 965 966 /* 967 * Measure tape still time, in milliseconds 968 */ 969 unsigned long tape_still_time_begin; 970 int tape_still_time; 971 972 /* 973 * Speed regulation negative feedback loop 974 */ 975 int speed_control; 976 int pipeline_head_speed; 977 int controlled_pipeline_head_speed; 978 int uncontrolled_pipeline_head_speed; 979 int controlled_last_pipeline_head; 980 int uncontrolled_last_pipeline_head; 981 unsigned long uncontrolled_pipeline_head_time; 982 unsigned long controlled_pipeline_head_time; 983 int controlled_previous_pipeline_head; 984 int uncontrolled_previous_pipeline_head; 985 unsigned long controlled_previous_head_time; 986 unsigned long uncontrolled_previous_head_time; 987 int restart_speed_control_req; 988 989 /* 990 * Debug_level determines amount of debugging output; 991 * can be changed using /proc/ide/hdx/settings 992 * 0 : almost no debugging output 993 * 1 : 0+output errors only 994 * 2 : 1+output all sensekey/asc 995 * 3 : 2+follow all chrdev related procedures 996 * 4 : 3+follow all procedures 997 * 5 : 4+include pc_stack rq_stack info 998 * 6 : 5+USE_COUNT updates 999 */ 1000 int debug_level; 1001} idetape_tape_t; 1002 1003static DEFINE_MUTEX(idetape_ref_mutex); 1004 1005static struct class *idetape_sysfs_class; 1006 1007#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) 1008 1009#define ide_tape_g(disk) \ 1010 container_of((disk)->private_data, struct ide_tape_obj, driver) 1011 1012static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) 1013{ 1014 struct ide_tape_obj *tape = NULL; 1015 1016 mutex_lock(&idetape_ref_mutex); 1017 tape = ide_tape_g(disk); 1018 if (tape) 1019 kref_get(&tape->kref); 1020 mutex_unlock(&idetape_ref_mutex); 1021 return tape; 1022} 1023 1024static void ide_tape_release(struct kref *); 1025 1026static void ide_tape_put(struct ide_tape_obj *tape) 1027{ 1028 mutex_lock(&idetape_ref_mutex); 1029 kref_put(&tape->kref, ide_tape_release); 1030 mutex_unlock(&idetape_ref_mutex); 1031} 1032 1033/* 1034 * Tape door status 1035 */ 1036#define DOOR_UNLOCKED 0 1037#define DOOR_LOCKED 1 1038#define DOOR_EXPLICITLY_LOCKED 2 1039 1040/* 1041 * Tape flag bits values. 1042 */ 1043#define IDETAPE_IGNORE_DSC 0 1044#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ 1045#define IDETAPE_BUSY 2 /* Device already opened */ 1046#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ 1047#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ 1048#define IDETAPE_FILEMARK 5 /* Currently on a filemark */ 1049#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ 1050#define IDETAPE_READ_ERROR 7 1051#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ 1052/* 0 = no tape is loaded, so we don't rewind after ejecting */ 1053#define IDETAPE_MEDIUM_PRESENT 9 1054 1055/* 1056 * Supported ATAPI tape drives packet commands 1057 */ 1058#define IDETAPE_TEST_UNIT_READY_CMD 0x00 1059#define IDETAPE_REWIND_CMD 0x01 1060#define IDETAPE_REQUEST_SENSE_CMD 0x03 1061#define IDETAPE_READ_CMD 0x08 1062#define IDETAPE_WRITE_CMD 0x0a 1063#define IDETAPE_WRITE_FILEMARK_CMD 0x10 1064#define IDETAPE_SPACE_CMD 0x11 1065#define IDETAPE_INQUIRY_CMD 0x12 1066#define IDETAPE_ERASE_CMD 0x19 1067#define IDETAPE_MODE_SENSE_CMD 0x1a 1068#define IDETAPE_MODE_SELECT_CMD 0x15 1069#define IDETAPE_LOAD_UNLOAD_CMD 0x1b 1070#define IDETAPE_PREVENT_CMD 0x1e 1071#define IDETAPE_LOCATE_CMD 0x2b 1072#define IDETAPE_READ_POSITION_CMD 0x34 1073#define IDETAPE_READ_BUFFER_CMD 0x3c 1074#define IDETAPE_SET_SPEED_CMD 0xbb 1075 1076/* 1077 * Some defines for the READ BUFFER command 1078 */ 1079#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 1080 1081/* 1082 * Some defines for the SPACE command 1083 */ 1084#define IDETAPE_SPACE_OVER_FILEMARK 1 1085#define IDETAPE_SPACE_TO_EOD 3 1086 1087/* 1088 * Some defines for the LOAD UNLOAD command 1089 */ 1090#define IDETAPE_LU_LOAD_MASK 1 1091#define IDETAPE_LU_RETENSION_MASK 2 1092#define IDETAPE_LU_EOT_MASK 4 1093 1094/* 1095 * Special requests for our block device strategy routine. 1096 * 1097 * In order to service a character device command, we add special 1098 * requests to the tail of our block device request queue and wait 1099 * for their completion. 1100 */ 1101 1102enum { 1103 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ 1104 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ 1105 REQ_IDETAPE_READ = (1 << 2), 1106 REQ_IDETAPE_WRITE = (1 << 3), 1107 REQ_IDETAPE_READ_BUFFER = (1 << 4), 1108}; 1109 1110/* 1111 * Error codes which are returned in rq->errors to the higher part 1112 * of the driver. 1113 */ 1114#define IDETAPE_ERROR_GENERAL 101 1115#define IDETAPE_ERROR_FILEMARK 102 1116#define IDETAPE_ERROR_EOD 103 1117 1118/* 1119 * The following is used to format the general configuration word of 1120 * the ATAPI IDENTIFY DEVICE command. 1121 */ 1122struct idetape_id_gcw { 1123 unsigned packet_size :2; /* Packet Size */ 1124 unsigned reserved234 :3; /* Reserved */ 1125 unsigned drq_type :2; /* Command packet DRQ type */ 1126 unsigned removable :1; /* Removable media */ 1127 unsigned device_type :5; /* Device type */ 1128 unsigned reserved13 :1; /* Reserved */ 1129 unsigned protocol :2; /* Protocol type */ 1130}; 1131 1132/* 1133 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) 1134 */ 1135typedef struct { 1136 unsigned device_type :5; /* Peripheral Device Type */ 1137 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ 1138 unsigned reserved1_6t0 :7; /* Reserved */ 1139 unsigned rmb :1; /* Removable Medium Bit */ 1140 unsigned ansi_version :3; /* ANSI Version */ 1141 unsigned ecma_version :3; /* ECMA Version */ 1142 unsigned iso_version :2; /* ISO Version */ 1143 unsigned response_format :4; /* Response Data Format */ 1144 unsigned reserved3_45 :2; /* Reserved */ 1145 unsigned reserved3_6 :1; /* TrmIOP - Reserved */ 1146 unsigned reserved3_7 :1; /* AENC - Reserved */ 1147 __u8 additional_length; /* Additional Length (total_length-4) */ 1148 __u8 rsv5, rsv6, rsv7; /* Reserved */ 1149 __u8 vendor_id[8]; /* Vendor Identification */ 1150 __u8 product_id[16]; /* Product Identification */ 1151 __u8 revision_level[4]; /* Revision Level */ 1152 __u8 vendor_specific[20]; /* Vendor Specific - Optional */ 1153 __u8 reserved56t95[40]; /* Reserved - Optional */ 1154 /* Additional information may be returned */ 1155} idetape_inquiry_result_t; 1156 1157/* 1158 * READ POSITION packet command - Data Format (From Table 6-57) 1159 */ 1160typedef struct { 1161 unsigned reserved0_10 :2; /* Reserved */ 1162 unsigned bpu :1; /* Block Position Unknown */ 1163 unsigned reserved0_543 :3; /* Reserved */ 1164 unsigned eop :1; /* End Of Partition */ 1165 unsigned bop :1; /* Beginning Of Partition */ 1166 u8 partition; /* Partition Number */ 1167 u8 reserved2, reserved3; /* Reserved */ 1168 u32 first_block; /* First Block Location */ 1169 u32 last_block; /* Last Block Location (Optional) */ 1170 u8 reserved12; /* Reserved */ 1171 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ 1172 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ 1173} idetape_read_position_result_t; 1174 1175/* 1176 * Follows structures which are related to the SELECT SENSE / MODE SENSE 1177 * packet commands. Those packet commands are still not supported 1178 * by ide-tape. 1179 */ 1180#define IDETAPE_BLOCK_DESCRIPTOR 0 1181#define IDETAPE_CAPABILITIES_PAGE 0x2a 1182#define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ 1183#define IDETAPE_BLOCK_SIZE_PAGE 0x30 1184#define IDETAPE_BUFFER_FILLING_PAGE 0x33 1185 1186/* 1187 * Mode Parameter Header for the MODE SENSE packet command 1188 */ 1189typedef struct { 1190 __u8 mode_data_length; /* Length of the following data transfer */ 1191 __u8 medium_type; /* Medium Type */ 1192 __u8 dsp; /* Device Specific Parameter */ 1193 __u8 bdl; /* Block Descriptor Length */ 1194#if 0 1195 /* data transfer page */ 1196 __u8 page_code :6; 1197 __u8 reserved0_6 :1; 1198 __u8 ps :1; /* parameters saveable */ 1199 __u8 page_length; /* page Length == 0x02 */ 1200 __u8 reserved2; 1201 __u8 read32k :1; /* 32k blk size (data only) */ 1202 __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */ 1203 __u8 reserved3_23 :2; 1204 __u8 write32k :1; /* 32k blk size (data only) */ 1205 __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */ 1206 __u8 reserved3_6 :1; 1207 __u8 streaming :1; /* streaming mode enable */ 1208#endif 1209} idetape_mode_parameter_header_t; 1210 1211/* 1212 * Mode Parameter Block Descriptor the MODE SENSE packet command 1213 * 1214 * Support for block descriptors is optional. 1215 */ 1216typedef struct { 1217 __u8 density_code; /* Medium density code */ 1218 __u8 blocks[3]; /* Number of blocks */ 1219 __u8 reserved4; /* Reserved */ 1220 __u8 length[3]; /* Block Length */ 1221} idetape_parameter_block_descriptor_t; 1222 1223/* 1224 * The Data Compression Page, as returned by the MODE SENSE packet command. 1225 */ 1226typedef struct { 1227 unsigned page_code :6; /* Page Code - Should be 0xf */ 1228 unsigned reserved0 :1; /* Reserved */ 1229 unsigned ps :1; 1230 __u8 page_length; /* Page Length - Should be 14 */ 1231 unsigned reserved2 :6; /* Reserved */ 1232 unsigned dcc :1; /* Data Compression Capable */ 1233 unsigned dce :1; /* Data Compression Enable */ 1234 unsigned reserved3 :5; /* Reserved */ 1235 unsigned red :2; /* Report Exception on Decompression */ 1236 unsigned dde :1; /* Data Decompression Enable */ 1237 __u32 ca; /* Compression Algorithm */ 1238 __u32 da; /* Decompression Algorithm */ 1239 __u8 reserved[4]; /* Reserved */ 1240} idetape_data_compression_page_t; 1241 1242/* 1243 * The Medium Partition Page, as returned by the MODE SENSE packet command. 1244 */ 1245typedef struct { 1246 unsigned page_code :6; /* Page Code - Should be 0x11 */ 1247 unsigned reserved1_6 :1; /* Reserved */ 1248 unsigned ps :1; 1249 __u8 page_length; /* Page Length - Should be 6 */ 1250 __u8 map; /* Maximum Additional Partitions - Should be 0 */ 1251 __u8 apd; /* Additional Partitions Defined - Should be 0 */ 1252 unsigned reserved4_012 :3; /* Reserved */ 1253 unsigned psum :2; /* Should be 0 */ 1254 unsigned idp :1; /* Should be 0 */ 1255 unsigned sdp :1; /* Should be 0 */ 1256 unsigned fdp :1; /* Fixed Data Partitions */ 1257 __u8 mfr; /* Medium Format Recognition */ 1258 __u8 reserved[2]; /* Reserved */ 1259} idetape_medium_partition_page_t; 1260 1261/* 1262 * Run time configurable parameters. 1263 */ 1264typedef struct { 1265 int dsc_rw_frequency; 1266 int dsc_media_access_frequency; 1267 int nr_stages; 1268} idetape_config_t; 1269 1270/* 1271 * The variables below are used for the character device interface. 1272 * Additional state variables are defined in our ide_drive_t structure. 1273 */ 1274static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; 1275 1276#define ide_tape_f(file) ((file)->private_data) 1277 1278static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) 1279{ 1280 struct ide_tape_obj *tape = NULL; 1281 1282 mutex_lock(&idetape_ref_mutex); 1283 tape = idetape_devs[i]; 1284 if (tape) 1285 kref_get(&tape->kref); 1286 mutex_unlock(&idetape_ref_mutex); 1287 return tape; 1288} 1289 1290/* 1291 * Function declarations 1292 * 1293 */ 1294static int idetape_chrdev_release (struct inode *inode, struct file *filp); 1295static void idetape_write_release (ide_drive_t *drive, unsigned int minor); 1296 1297/* 1298 * Too bad. The drive wants to send us data which we are not ready to accept. 1299 * Just throw it away. 1300 */ 1301static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) 1302{ 1303 while (bcount--) 1304 (void) HWIF(drive)->INB(IDE_DATA_REG); 1305} 1306 1307static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 1308{ 1309 struct idetape_bh *bh = pc->bh; 1310 int count; 1311 1312 while (bcount) { 1313#if IDETAPE_DEBUG_BUGS 1314 if (bh == NULL) { 1315 printk(KERN_ERR "ide-tape: bh == NULL in " 1316 "idetape_input_buffers\n"); 1317 idetape_discard_data(drive, bcount); 1318 return; 1319 } 1320#endif /* IDETAPE_DEBUG_BUGS */ 1321 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); 1322 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); 1323 bcount -= count; 1324 atomic_add(count, &bh->b_count); 1325 if (atomic_read(&bh->b_count) == bh->b_size) { 1326 bh = bh->b_reqnext; 1327 if (bh) 1328 atomic_set(&bh->b_count, 0); 1329 } 1330 } 1331 pc->bh = bh; 1332} 1333 1334static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) 1335{ 1336 struct idetape_bh *bh = pc->bh; 1337 int count; 1338 1339 while (bcount) { 1340#if IDETAPE_DEBUG_BUGS 1341 if (bh == NULL) { 1342 printk(KERN_ERR "ide-tape: bh == NULL in " 1343 "idetape_output_buffers\n"); 1344 return; 1345 } 1346#endif /* IDETAPE_DEBUG_BUGS */ 1347 count = min((unsigned int)pc->b_count, (unsigned int)bcount); 1348 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); 1349 bcount -= count; 1350 pc->b_data += count; 1351 pc->b_count -= count; 1352 if (!pc->b_count) { 1353 pc->bh = bh = bh->b_reqnext; 1354 if (bh) { 1355 pc->b_data = bh->b_data; 1356 pc->b_count = atomic_read(&bh->b_count); 1357 } 1358 } 1359 } 1360} 1361 1362static void idetape_update_buffers (idetape_pc_t *pc) 1363{ 1364 struct idetape_bh *bh = pc->bh; 1365 int count; 1366 unsigned int bcount = pc->actually_transferred; 1367 1368 if (test_bit(PC_WRITING, &pc->flags)) 1369 return; 1370 while (bcount) { 1371#if IDETAPE_DEBUG_BUGS 1372 if (bh == NULL) { 1373 printk(KERN_ERR "ide-tape: bh == NULL in " 1374 "idetape_update_buffers\n"); 1375 return; 1376 } 1377#endif /* IDETAPE_DEBUG_BUGS */ 1378 count = min((unsigned int)bh->b_size, (unsigned int)bcount); 1379 atomic_set(&bh->b_count, count); 1380 if (atomic_read(&bh->b_count) == bh->b_size) 1381 bh = bh->b_reqnext; 1382 bcount -= count; 1383 } 1384 pc->bh = bh; 1385} 1386 1387/* 1388 * idetape_next_pc_storage returns a pointer to a place in which we can 1389 * safely store a packet command, even though we intend to leave the 1390 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet 1391 * commands is allocated at initialization time. 1392 */ 1393static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) 1394{ 1395 idetape_tape_t *tape = drive->driver_data; 1396 1397#if IDETAPE_DEBUG_LOG 1398 if (tape->debug_level >= 5) 1399 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", 1400 tape->pc_stack_index); 1401#endif /* IDETAPE_DEBUG_LOG */ 1402 if (tape->pc_stack_index == IDETAPE_PC_STACK) 1403 tape->pc_stack_index=0; 1404 return (&tape->pc_stack[tape->pc_stack_index++]); 1405} 1406 1407/* 1408 * idetape_next_rq_storage is used along with idetape_next_pc_storage. 1409 * Since we queue packet commands in the request queue, we need to 1410 * allocate a request, along with the allocation of a packet command. 1411 */ 1412 1413/************************************************************** 1414 * * 1415 * This should get fixed to use kmalloc(.., GFP_ATOMIC) * 1416 * followed later on by kfree(). -ml * 1417 * * 1418 **************************************************************/ 1419 1420static struct request *idetape_next_rq_storage (ide_drive_t *drive) 1421{ 1422 idetape_tape_t *tape = drive->driver_data; 1423 1424#if IDETAPE_DEBUG_LOG 1425 if (tape->debug_level >= 5) 1426 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", 1427 tape->rq_stack_index); 1428#endif /* IDETAPE_DEBUG_LOG */ 1429 if (tape->rq_stack_index == IDETAPE_PC_STACK) 1430 tape->rq_stack_index=0; 1431 return (&tape->rq_stack[tape->rq_stack_index++]); 1432} 1433 1434/* 1435 * idetape_init_pc initializes a packet command. 1436 */ 1437static void idetape_init_pc (idetape_pc_t *pc) 1438{ 1439 memset(pc->c, 0, 12); 1440 pc->retries = 0; 1441 pc->flags = 0; 1442 pc->request_transfer = 0; 1443 pc->buffer = pc->pc_buffer; 1444 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; 1445 pc->bh = NULL; 1446 pc->b_data = NULL; 1447} 1448 1449/* 1450 * idetape_analyze_error is called on each failed packet command retry 1451 * to analyze the request sense. We currently do not utilize this 1452 * information. 1453 */ 1454static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) 1455{ 1456 idetape_tape_t *tape = drive->driver_data; 1457 idetape_pc_t *pc = tape->failed_pc; 1458 1459 tape->sense = *result; 1460 tape->sense_key = result->sense_key; 1461 tape->asc = result->asc; 1462 tape->ascq = result->ascq; 1463#if IDETAPE_DEBUG_LOG 1464 /* 1465 * Without debugging, we only log an error if we decided to 1466 * give up retrying. 1467 */ 1468 if (tape->debug_level >= 1) 1469 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " 1470 "asc = %x, ascq = %x\n", 1471 pc->c[0], result->sense_key, 1472 result->asc, result->ascq); 1473#endif /* IDETAPE_DEBUG_LOG */ 1474 1475 /* 1476 * Correct pc->actually_transferred by asking the tape. 1477 */ 1478 if (test_bit(PC_DMA_ERROR, &pc->flags)) { 1479 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information)); 1480 idetape_update_buffers(pc); 1481 } 1482 1483 /* 1484 * If error was the result of a zero-length read or write command, 1485 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives 1486 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. 1487 */ 1488 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) 1489 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */ 1490 if (result->sense_key == 5) { 1491 /* don't report an error, everything's ok */ 1492 pc->error = 0; 1493 /* don't retry read/write */ 1494 set_bit(PC_ABORT, &pc->flags); 1495 } 1496 } 1497 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { 1498 pc->error = IDETAPE_ERROR_FILEMARK; 1499 set_bit(PC_ABORT, &pc->flags); 1500 } 1501 if (pc->c[0] == IDETAPE_WRITE_CMD) { 1502 if (result->eom || 1503 (result->sense_key == 0xd && result->asc == 0x0 && 1504 result->ascq == 0x2)) { 1505 pc->error = IDETAPE_ERROR_EOD; 1506 set_bit(PC_ABORT, &pc->flags); 1507 } 1508 } 1509 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { 1510 if (result->sense_key == 8) { 1511 pc->error = IDETAPE_ERROR_EOD; 1512 set_bit(PC_ABORT, &pc->flags); 1513 } 1514 if (!test_bit(PC_ABORT, &pc->flags) && 1515 pc->actually_transferred) 1516 pc->retries = IDETAPE_MAX_PC_RETRIES + 1; 1517 } 1518} 1519 1520/* 1521 * idetape_active_next_stage will declare the next stage as "active". 1522 */ 1523static void idetape_active_next_stage (ide_drive_t *drive) 1524{ 1525 idetape_tape_t *tape = drive->driver_data; 1526 idetape_stage_t *stage = tape->next_stage; 1527 struct request *rq = &stage->rq; 1528 1529#if IDETAPE_DEBUG_LOG 1530 if (tape->debug_level >= 4) 1531 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); 1532#endif /* IDETAPE_DEBUG_LOG */ 1533#if IDETAPE_DEBUG_BUGS 1534 if (stage == NULL) { 1535 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); 1536 return; 1537 } 1538#endif /* IDETAPE_DEBUG_BUGS */ 1539 1540 rq->rq_disk = tape->disk; 1541 rq->buffer = NULL; 1542 rq->special = (void *)stage->bh; 1543 tape->active_data_request = rq; 1544 tape->active_stage = stage; 1545 tape->next_stage = stage->next; 1546} 1547 1548/* 1549 * idetape_increase_max_pipeline_stages is a part of the feedback 1550 * loop which tries to find the optimum number of stages. In the 1551 * feedback loop, we are starting from a minimum maximum number of 1552 * stages, and if we sense that the pipeline is empty, we try to 1553 * increase it, until we reach the user compile time memory limit. 1554 */ 1555static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) 1556{ 1557 idetape_tape_t *tape = drive->driver_data; 1558 int increase = (tape->max_pipeline - tape->min_pipeline) / 10; 1559 1560#if IDETAPE_DEBUG_LOG 1561 if (tape->debug_level >= 4) 1562 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); 1563#endif /* IDETAPE_DEBUG_LOG */ 1564 1565 tape->max_stages += max(increase, 1); 1566 tape->max_stages = max(tape->max_stages, tape->min_pipeline); 1567 tape->max_stages = min(tape->max_stages, tape->max_pipeline); 1568} 1569 1570/* 1571 * idetape_kfree_stage calls kfree to completely free a stage, along with 1572 * its related buffers. 1573 */ 1574static void __idetape_kfree_stage (idetape_stage_t *stage) 1575{ 1576 struct idetape_bh *prev_bh, *bh = stage->bh; 1577 int size; 1578 1579 while (bh != NULL) { 1580 if (bh->b_data != NULL) { 1581 size = (int) bh->b_size; 1582 while (size > 0) { 1583 free_page((unsigned long) bh->b_data); 1584 size -= PAGE_SIZE; 1585 bh->b_data += PAGE_SIZE; 1586 } 1587 } 1588 prev_bh = bh; 1589 bh = bh->b_reqnext; 1590 kfree(prev_bh); 1591 } 1592 kfree(stage); 1593} 1594 1595static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) 1596{ 1597 __idetape_kfree_stage(stage); 1598} 1599 1600/* 1601 * idetape_remove_stage_head removes tape->first_stage from the pipeline. 1602 * The caller should avoid race conditions. 1603 */ 1604static void idetape_remove_stage_head (ide_drive_t *drive) 1605{ 1606 idetape_tape_t *tape = drive->driver_data; 1607 idetape_stage_t *stage; 1608 1609#if IDETAPE_DEBUG_LOG 1610 if (tape->debug_level >= 4) 1611 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); 1612#endif /* IDETAPE_DEBUG_LOG */ 1613#if IDETAPE_DEBUG_BUGS 1614 if (tape->first_stage == NULL) { 1615 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); 1616 return; 1617 } 1618 if (tape->active_stage == tape->first_stage) { 1619 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); 1620 return; 1621 } 1622#endif /* IDETAPE_DEBUG_BUGS */ 1623 stage = tape->first_stage; 1624 tape->first_stage = stage->next; 1625 idetape_kfree_stage(tape, stage); 1626 tape->nr_stages--; 1627 if (tape->first_stage == NULL) { 1628 tape->last_stage = NULL; 1629#if IDETAPE_DEBUG_BUGS 1630 if (tape->next_stage != NULL) 1631 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); 1632 if (tape->nr_stages) 1633 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); 1634#endif /* IDETAPE_DEBUG_BUGS */ 1635 } 1636} 1637 1638/* 1639 * This will free all the pipeline stages starting from new_last_stage->next 1640 * to the end of the list, and point tape->last_stage to new_last_stage. 1641 */ 1642static void idetape_abort_pipeline(ide_drive_t *drive, 1643 idetape_stage_t *new_last_stage) 1644{ 1645 idetape_tape_t *tape = drive->driver_data; 1646 idetape_stage_t *stage = new_last_stage->next; 1647 idetape_stage_t *nstage; 1648 1649#if IDETAPE_DEBUG_LOG 1650 if (tape->debug_level >= 4) 1651 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); 1652#endif 1653 while (stage) { 1654 nstage = stage->next; 1655 idetape_kfree_stage(tape, stage); 1656 --tape->nr_stages; 1657 --tape->nr_pending_stages; 1658 stage = nstage; 1659 } 1660 if (new_last_stage) 1661 new_last_stage->next = NULL; 1662 tape->last_stage = new_last_stage; 1663 tape->next_stage = NULL; 1664} 1665 1666/* 1667 * idetape_end_request is used to finish servicing a request, and to 1668 * insert a pending pipeline request into the main device queue. 1669 */ 1670static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) 1671{ 1672 struct request *rq = HWGROUP(drive)->rq; 1673 idetape_tape_t *tape = drive->driver_data; 1674 unsigned long flags; 1675 int error; 1676 int remove_stage = 0; 1677 idetape_stage_t *active_stage; 1678 1679#if IDETAPE_DEBUG_LOG 1680 if (tape->debug_level >= 4) 1681 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); 1682#endif /* IDETAPE_DEBUG_LOG */ 1683 1684 switch (uptodate) { 1685 case 0: error = IDETAPE_ERROR_GENERAL; break; 1686 case 1: error = 0; break; 1687 default: error = uptodate; 1688 } 1689 rq->errors = error; 1690 if (error) 1691 tape->failed_pc = NULL; 1692 1693 spin_lock_irqsave(&tape->spinlock, flags); 1694 1695 /* The request was a pipelined data transfer request */ 1696 if (tape->active_data_request == rq) { 1697 active_stage = tape->active_stage; 1698 tape->active_stage = NULL; 1699 tape->active_data_request = NULL; 1700 tape->nr_pending_stages--; 1701 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 1702 remove_stage = 1; 1703 if (error) { 1704 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1705 if (error == IDETAPE_ERROR_EOD) 1706 idetape_abort_pipeline(drive, active_stage); 1707 } 1708 } else if (rq->cmd[0] & REQ_IDETAPE_READ) { 1709 if (error == IDETAPE_ERROR_EOD) { 1710 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 1711 idetape_abort_pipeline(drive, active_stage); 1712 } 1713 } 1714 if (tape->next_stage != NULL) { 1715 idetape_active_next_stage(drive); 1716 1717 /* 1718 * Insert the next request into the request queue. 1719 */ 1720 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 1721 } else if (!error) { 1722 idetape_increase_max_pipeline_stages(drive); 1723 } 1724 } 1725 ide_end_drive_cmd(drive, 0, 0); 1726// blkdev_dequeue_request(rq); 1727// drive->rq = NULL; 1728// end_that_request_last(rq); 1729 1730 if (remove_stage) 1731 idetape_remove_stage_head(drive); 1732 if (tape->active_data_request == NULL) 1733 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 1734 spin_unlock_irqrestore(&tape->spinlock, flags); 1735 return 0; 1736} 1737 1738static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) 1739{ 1740 idetape_tape_t *tape = drive->driver_data; 1741 1742#if IDETAPE_DEBUG_LOG 1743 if (tape->debug_level >= 4) 1744 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); 1745#endif /* IDETAPE_DEBUG_LOG */ 1746 if (!tape->pc->error) { 1747 idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer); 1748 idetape_end_request(drive, 1, 0); 1749 } else { 1750 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); 1751 idetape_end_request(drive, 0, 0); 1752 } 1753 return ide_stopped; 1754} 1755 1756static void idetape_create_request_sense_cmd (idetape_pc_t *pc) 1757{ 1758 idetape_init_pc(pc); 1759 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; 1760 pc->c[4] = 20; 1761 pc->request_transfer = 20; 1762 pc->callback = &idetape_request_sense_callback; 1763} 1764 1765static void idetape_init_rq(struct request *rq, u8 cmd) 1766{ 1767 memset(rq, 0, sizeof(*rq)); 1768 rq->cmd_type = REQ_TYPE_SPECIAL; 1769 rq->cmd[0] = cmd; 1770} 1771 1772/* 1773 * idetape_queue_pc_head generates a new packet command request in front 1774 * of the request queue, before the current request, so that it will be 1775 * processed immediately, on the next pass through the driver. 1776 * 1777 * idetape_queue_pc_head is called from the request handling part of 1778 * the driver (the "bottom" part). Safe storage for the request should 1779 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage 1780 * before calling idetape_queue_pc_head. 1781 * 1782 * Memory for those requests is pre-allocated at initialization time, and 1783 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough 1784 * space for the maximum possible number of inter-dependent packet commands. 1785 * 1786 * The higher level of the driver - The ioctl handler and the character 1787 * device handling functions should queue request to the lower level part 1788 * and wait for their completion using idetape_queue_pc_tail or 1789 * idetape_queue_rw_tail. 1790 */ 1791static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) 1792{ 1793 struct ide_tape_obj *tape = drive->driver_data; 1794 1795 idetape_init_rq(rq, REQ_IDETAPE_PC1); 1796 rq->buffer = (char *) pc; 1797 rq->rq_disk = tape->disk; 1798 (void) ide_do_drive_cmd(drive, rq, ide_preempt); 1799} 1800 1801/* 1802 * idetape_retry_pc is called when an error was detected during the 1803 * last packet command. We queue a request sense packet command in 1804 * the head of the request list. 1805 */ 1806static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) 1807{ 1808 idetape_tape_t *tape = drive->driver_data; 1809 idetape_pc_t *pc; 1810 struct request *rq; 1811 1812 (void)drive->hwif->INB(IDE_ERROR_REG); 1813 pc = idetape_next_pc_storage(drive); 1814 rq = idetape_next_rq_storage(drive); 1815 idetape_create_request_sense_cmd(pc); 1816 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 1817 idetape_queue_pc_head(drive, pc, rq); 1818 return ide_stopped; 1819} 1820 1821/* 1822 * idetape_postpone_request postpones the current request so that 1823 * ide.c will be able to service requests from another device on 1824 * the same hwgroup while we are polling for DSC. 1825 */ 1826static void idetape_postpone_request (ide_drive_t *drive) 1827{ 1828 idetape_tape_t *tape = drive->driver_data; 1829 1830#if IDETAPE_DEBUG_LOG 1831 if (tape->debug_level >= 4) 1832 printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); 1833#endif 1834 tape->postponed_rq = HWGROUP(drive)->rq; 1835 ide_stall_queue(drive, tape->dsc_polling_frequency); 1836} 1837 1838/* 1839 * idetape_pc_intr is the usual interrupt handler which will be called 1840 * during a packet command. We will transfer some of the data (as 1841 * requested by the drive) and will re-point interrupt handler to us. 1842 * When data transfer is finished, we will act according to the 1843 * algorithm described before idetape_issue_packet_command. 1844 * 1845 */ 1846static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) 1847{ 1848 ide_hwif_t *hwif = drive->hwif; 1849 idetape_tape_t *tape = drive->driver_data; 1850 idetape_pc_t *pc = tape->pc; 1851 unsigned int temp; 1852#if SIMULATE_ERRORS 1853 static int error_sim_count = 0; 1854#endif 1855 u16 bcount; 1856 u8 stat, ireason; 1857 1858#if IDETAPE_DEBUG_LOG 1859 if (tape->debug_level >= 4) 1860 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " 1861 "interrupt handler\n"); 1862#endif /* IDETAPE_DEBUG_LOG */ 1863 1864 /* Clear the interrupt */ 1865 stat = hwif->INB(IDE_STATUS_REG); 1866 1867 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1868 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) { 1869 /* 1870 * A DMA error is sometimes expected. For example, 1871 * if the tape is crossing a filemark during a 1872 * READ command, it will issue an irq and position 1873 * itself before the filemark, so that only a partial 1874 * data transfer will occur (which causes the DMA 1875 * error). In that case, we will later ask the tape 1876 * how much bytes of the original request were 1877 * actually transferred (we can't receive that 1878 * information from the DMA engine on most chipsets). 1879 */ 1880 1881 /* 1882 * On the contrary, a DMA error is never expected; 1883 * it usually indicates a hardware error or abort. 1884 * If the tape crosses a filemark during a READ 1885 * command, it will issue an irq and position itself 1886 * after the filemark (not before). Only a partial 1887 * data transfer will occur, but no DMA error. 1888 * (AS, 19 Apr 2001) 1889 */ 1890 set_bit(PC_DMA_ERROR, &pc->flags); 1891 } else { 1892 pc->actually_transferred = pc->request_transfer; 1893 idetape_update_buffers(pc); 1894 } 1895#if IDETAPE_DEBUG_LOG 1896 if (tape->debug_level >= 4) 1897 printk(KERN_INFO "ide-tape: DMA finished\n"); 1898#endif /* IDETAPE_DEBUG_LOG */ 1899 } 1900 1901 /* No more interrupts */ 1902 if ((stat & DRQ_STAT) == 0) { 1903#if IDETAPE_DEBUG_LOG 1904 if (tape->debug_level >= 2) 1905 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); 1906#endif /* IDETAPE_DEBUG_LOG */ 1907 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); 1908 1909 local_irq_enable(); 1910 1911#if SIMULATE_ERRORS 1912 if ((pc->c[0] == IDETAPE_WRITE_CMD || 1913 pc->c[0] == IDETAPE_READ_CMD) && 1914 (++error_sim_count % 100) == 0) { 1915 printk(KERN_INFO "ide-tape: %s: simulating error\n", 1916 tape->name); 1917 stat |= ERR_STAT; 1918 } 1919#endif 1920 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) 1921 stat &= ~ERR_STAT; 1922 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) { 1923 /* Error detected */ 1924#if IDETAPE_DEBUG_LOG 1925 if (tape->debug_level >= 1) 1926 printk(KERN_INFO "ide-tape: %s: I/O error\n", 1927 tape->name); 1928#endif /* IDETAPE_DEBUG_LOG */ 1929 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 1930 printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); 1931 return ide_do_reset(drive); 1932 } 1933#if IDETAPE_DEBUG_LOG 1934 if (tape->debug_level >= 1) 1935 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); 1936#endif 1937 /* Retry operation */ 1938 return idetape_retry_pc(drive); 1939 } 1940 pc->error = 0; 1941 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && 1942 (stat & SEEK_STAT) == 0) { 1943 /* Media access command */ 1944 tape->dsc_polling_start = jiffies; 1945 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; 1946 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; 1947 /* Allow ide.c to handle other requests */ 1948 idetape_postpone_request(drive); 1949 return ide_stopped; 1950 } 1951 if (tape->failed_pc == pc) 1952 tape->failed_pc = NULL; 1953 /* Command finished - Call the callback function */ 1954 return pc->callback(drive); 1955 } 1956 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { 1957 printk(KERN_ERR "ide-tape: The tape wants to issue more " 1958 "interrupts in DMA mode\n"); 1959 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); 1960 ide_dma_off(drive); 1961 return ide_do_reset(drive); 1962 } 1963 /* Get the number of bytes to transfer on this interrupt. */ 1964 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) | 1965 hwif->INB(IDE_BCOUNTL_REG); 1966 1967 ireason = hwif->INB(IDE_IREASON_REG); 1968 1969 if (ireason & CD) { 1970 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); 1971 return ide_do_reset(drive); 1972 } 1973 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) { 1974 /* Hopefully, we will never get here */ 1975 printk(KERN_ERR "ide-tape: We wanted to %s, ", 1976 (ireason & IO) ? "Write" : "Read"); 1977 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", 1978 (ireason & IO) ? "Read" : "Write"); 1979 return ide_do_reset(drive); 1980 } 1981 if (!test_bit(PC_WRITING, &pc->flags)) { 1982 /* Reading - Check that we have enough space */ 1983 temp = pc->actually_transferred + bcount; 1984 if (temp > pc->request_transfer) { 1985 if (temp > pc->buffer_size) { 1986 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); 1987 idetape_discard_data(drive, bcount); 1988 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 1989 return ide_started; 1990 } 1991#if IDETAPE_DEBUG_LOG 1992 if (tape->debug_level >= 2) 1993 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); 1994#endif /* IDETAPE_DEBUG_LOG */ 1995 } 1996 } 1997 if (test_bit(PC_WRITING, &pc->flags)) { 1998 if (pc->bh != NULL) 1999 idetape_output_buffers(drive, pc, bcount); 2000 else 2001 /* Write the current buffer */ 2002 hwif->atapi_output_bytes(drive, pc->current_position, 2003 bcount); 2004 } else { 2005 if (pc->bh != NULL) 2006 idetape_input_buffers(drive, pc, bcount); 2007 else 2008 /* Read the current buffer */ 2009 hwif->atapi_input_bytes(drive, pc->current_position, 2010 bcount); 2011 } 2012 /* Update the current position */ 2013 pc->actually_transferred += bcount; 2014 pc->current_position += bcount; 2015#if IDETAPE_DEBUG_LOG 2016 if (tape->debug_level >= 2) 2017 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes " 2018 "on that interrupt\n", pc->c[0], bcount); 2019#endif 2020 /* And set the interrupt handler again */ 2021 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 2022 return ide_started; 2023} 2024 2025/* 2026 * Packet Command Interface 2027 * 2028 * The current Packet Command is available in tape->pc, and will not 2029 * change until we finish handling it. Each packet command is associated 2030 * with a callback function that will be called when the command is 2031 * finished. 2032 * 2033 * The handling will be done in three stages: 2034 * 2035 * 1. idetape_issue_packet_command will send the packet command to the 2036 * drive, and will set the interrupt handler to idetape_pc_intr. 2037 * 2038 * 2. On each interrupt, idetape_pc_intr will be called. This step 2039 * will be repeated until the device signals us that no more 2040 * interrupts will be issued. 2041 * 2042 * 3. ATAPI Tape media access commands have immediate status with a 2043 * delayed process. In case of a successful initiation of a 2044 * media access packet command, the DSC bit will be set when the 2045 * actual execution of the command is finished. 2046 * Since the tape drive will not issue an interrupt, we have to 2047 * poll for this event. In this case, we define the request as 2048 * "low priority request" by setting rq_status to 2049 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit 2050 * the driver. 2051 * 2052 * ide.c will then give higher priority to requests which 2053 * originate from the other device, until will change rq_status 2054 * to RQ_ACTIVE. 2055 * 2056 * 4. When the packet command is finished, it will be checked for errors. 2057 * 2058 * 5. In case an error was found, we queue a request sense packet 2059 * command in front of the request queue and retry the operation 2060 * up to IDETAPE_MAX_PC_RETRIES times. 2061 * 2062 * 6. In case no error was found, or we decided to give up and not 2063 * to retry again, the callback function will be called and then 2064 * we will handle the next request. 2065 * 2066 */ 2067static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) 2068{ 2069 ide_hwif_t *hwif = drive->hwif; 2070 idetape_tape_t *tape = drive->driver_data; 2071 idetape_pc_t *pc = tape->pc; 2072 int retries = 100; 2073 ide_startstop_t startstop; 2074 u8 ireason; 2075 2076 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { 2077 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); 2078 return startstop; 2079 } 2080 ireason = hwif->INB(IDE_IREASON_REG); 2081 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) { 2082 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " 2083 "a packet command, retrying\n"); 2084 udelay(100); 2085 ireason = hwif->INB(IDE_IREASON_REG); 2086 if (retries == 0) { 2087 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " 2088 "issuing a packet command, ignoring\n"); 2089 ireason |= CD; 2090 ireason &= ~IO; 2091 } 2092 } 2093 if ((ireason & CD) == 0 || (ireason & IO)) { 2094 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " 2095 "a packet command\n"); 2096 return ide_do_reset(drive); 2097 } 2098 /* Set the interrupt routine */ 2099 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); 2100#ifdef CONFIG_BLK_DEV_IDEDMA 2101 /* Begin DMA, if necessary */ 2102 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) 2103 hwif->dma_start(drive); 2104#endif 2105 /* Send the actual packet */ 2106 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); 2107 return ide_started; 2108} 2109 2110static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) 2111{ 2112 ide_hwif_t *hwif = drive->hwif; 2113 idetape_tape_t *tape = drive->driver_data; 2114 int dma_ok = 0; 2115 u16 bcount; 2116 2117#if IDETAPE_DEBUG_BUGS 2118 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && 2119 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 2120 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " 2121 "Two request sense in serial were issued\n"); 2122 } 2123#endif /* IDETAPE_DEBUG_BUGS */ 2124 2125 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) 2126 tape->failed_pc = pc; 2127 /* Set the current packet command */ 2128 tape->pc = pc; 2129 2130 if (pc->retries > IDETAPE_MAX_PC_RETRIES || 2131 test_bit(PC_ABORT, &pc->flags)) { 2132 /* 2133 * We will "abort" retrying a packet command in case 2134 * a legitimate error code was received (crossing a 2135 * filemark, or end of the media, for example). 2136 */ 2137 if (!test_bit(PC_ABORT, &pc->flags)) { 2138 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && 2139 tape->sense_key == 2 && tape->asc == 4 && 2140 (tape->ascq == 1 || tape->ascq == 8))) { 2141 printk(KERN_ERR "ide-tape: %s: I/O error, " 2142 "pc = %2x, key = %2x, " 2143 "asc = %2x, ascq = %2x\n", 2144 tape->name, pc->c[0], 2145 tape->sense_key, tape->asc, 2146 tape->ascq); 2147 } 2148 /* Giving up */ 2149 pc->error = IDETAPE_ERROR_GENERAL; 2150 } 2151 tape->failed_pc = NULL; 2152 return pc->callback(drive); 2153 } 2154#if IDETAPE_DEBUG_LOG 2155 if (tape->debug_level >= 2) 2156 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); 2157#endif /* IDETAPE_DEBUG_LOG */ 2158 2159 pc->retries++; 2160 /* We haven't transferred any data yet */ 2161 pc->actually_transferred = 0; 2162 pc->current_position = pc->buffer; 2163 /* Request to transfer the entire buffer at once */ 2164 bcount = pc->request_transfer; 2165 2166 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { 2167 printk(KERN_WARNING "ide-tape: DMA disabled, " 2168 "reverting to PIO\n"); 2169 ide_dma_off(drive); 2170 } 2171 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) 2172 dma_ok = !hwif->dma_setup(drive); 2173 2174 if (IDE_CONTROL_REG) 2175 hwif->OUTB(drive->ctl, IDE_CONTROL_REG); 2176 hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */ 2177 hwif->OUTB((bcount >> 8) & 0xff, IDE_BCOUNTH_REG); 2178 hwif->OUTB(bcount & 0xff, IDE_BCOUNTL_REG); 2179 hwif->OUTB(drive->select.all, IDE_SELECT_REG); 2180 if (dma_ok) /* Will begin DMA later */ 2181 set_bit(PC_DMA_IN_PROGRESS, &pc->flags); 2182 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { 2183 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); 2184 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); 2185 return ide_started; 2186 } else { 2187 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); 2188 return idetape_transfer_pc(drive); 2189 } 2190} 2191 2192/* 2193 * General packet command callback function. 2194 */ 2195static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) 2196{ 2197 idetape_tape_t *tape = drive->driver_data; 2198 2199#if IDETAPE_DEBUG_LOG 2200 if (tape->debug_level >= 4) 2201 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); 2202#endif /* IDETAPE_DEBUG_LOG */ 2203 2204 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); 2205 return ide_stopped; 2206} 2207 2208/* 2209 * A mode sense command is used to "sense" tape parameters. 2210 */ 2211static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) 2212{ 2213 idetape_init_pc(pc); 2214 pc->c[0] = IDETAPE_MODE_SENSE_CMD; 2215 if (page_code != IDETAPE_BLOCK_DESCRIPTOR) 2216 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ 2217 pc->c[2] = page_code; 2218 /* 2219 * Changed pc->c[3] to 0 (255 will at best return unused info). 2220 * 2221 * For SCSI this byte is defined as subpage instead of high byte 2222 * of length and some IDE drives seem to interpret it this way 2223 * and return an error when 255 is used. 2224 */ 2225 pc->c[3] = 0; 2226 pc->c[4] = 255; /* (We will just discard data in that case) */ 2227 if (page_code == IDETAPE_BLOCK_DESCRIPTOR) 2228 pc->request_transfer = 12; 2229 else if (page_code == IDETAPE_CAPABILITIES_PAGE) 2230 pc->request_transfer = 24; 2231 else 2232 pc->request_transfer = 50; 2233 pc->callback = &idetape_pc_callback; 2234} 2235 2236static void calculate_speeds(ide_drive_t *drive) 2237{ 2238 idetape_tape_t *tape = drive->driver_data; 2239 int full = 125, empty = 75; 2240 2241 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { 2242 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; 2243 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; 2244 tape->controlled_last_pipeline_head = tape->pipeline_head; 2245 tape->controlled_pipeline_head_time = jiffies; 2246 } 2247 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) 2248 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); 2249 else if (time_after(jiffies, tape->controlled_previous_head_time)) 2250 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); 2251 2252 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { 2253 /* -1 for read mode error recovery */ 2254 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { 2255 tape->uncontrolled_pipeline_head_time = jiffies; 2256 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); 2257 } 2258 } else { 2259 tape->uncontrolled_previous_head_time = jiffies; 2260 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; 2261 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { 2262 tape->uncontrolled_pipeline_head_time = jiffies; 2263 } 2264 } 2265 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); 2266 if (tape->speed_control == 0) { 2267 tape->max_insert_speed = 5000; 2268 } else if (tape->speed_control == 1) { 2269 if (tape->nr_pending_stages >= tape->max_stages / 2) 2270 tape->max_insert_speed = tape->pipeline_head_speed + 2271 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; 2272 else 2273 tape->max_insert_speed = 500 + 2274 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; 2275 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) 2276 tape->max_insert_speed = 5000; 2277 } else if (tape->speed_control == 2) { 2278 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + 2279 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; 2280 } else 2281 tape->max_insert_speed = tape->speed_control; 2282 tape->max_insert_speed = max(tape->max_insert_speed, 500); 2283} 2284 2285static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) 2286{ 2287 idetape_tape_t *tape = drive->driver_data; 2288 idetape_pc_t *pc = tape->pc; 2289 u8 stat; 2290 2291 stat = drive->hwif->INB(IDE_STATUS_REG); 2292 if (stat & SEEK_STAT) { 2293 if (stat & ERR_STAT) { 2294 /* Error detected */ 2295 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) 2296 printk(KERN_ERR "ide-tape: %s: I/O error, ", 2297 tape->name); 2298 /* Retry operation */ 2299 return idetape_retry_pc(drive); 2300 } 2301 pc->error = 0; 2302 if (tape->failed_pc == pc) 2303 tape->failed_pc = NULL; 2304 } else { 2305 pc->error = IDETAPE_ERROR_GENERAL; 2306 tape->failed_pc = NULL; 2307 } 2308 return pc->callback(drive); 2309} 2310 2311static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) 2312{ 2313 idetape_tape_t *tape = drive->driver_data; 2314 struct request *rq = HWGROUP(drive)->rq; 2315 int blocks = tape->pc->actually_transferred / tape->tape_block_size; 2316 2317 tape->avg_size += blocks * tape->tape_block_size; 2318 tape->insert_size += blocks * tape->tape_block_size; 2319 if (tape->insert_size > 1024 * 1024) 2320 tape->measure_insert_time = 1; 2321 if (tape->measure_insert_time) { 2322 tape->measure_insert_time = 0; 2323 tape->insert_time = jiffies; 2324 tape->insert_size = 0; 2325 } 2326 if (time_after(jiffies, tape->insert_time)) 2327 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2328 if (time_after_eq(jiffies, tape->avg_time + HZ)) { 2329 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; 2330 tape->avg_size = 0; 2331 tape->avg_time = jiffies; 2332 } 2333 2334#if IDETAPE_DEBUG_LOG 2335 if (tape->debug_level >= 4) 2336 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); 2337#endif /* IDETAPE_DEBUG_LOG */ 2338 2339 tape->first_frame_position += blocks; 2340 rq->current_nr_sectors -= blocks; 2341 2342 if (!tape->pc->error) 2343 idetape_end_request(drive, 1, 0); 2344 else 2345 idetape_end_request(drive, tape->pc->error, 0); 2346 return ide_stopped; 2347} 2348 2349static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 2350{ 2351 idetape_init_pc(pc); 2352 pc->c[0] = IDETAPE_READ_CMD; 2353 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 2354 pc->c[1] = 1; 2355 pc->callback = &idetape_rw_callback; 2356 pc->bh = bh; 2357 atomic_set(&bh->b_count, 0); 2358 pc->buffer = NULL; 2359 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 2360 if (pc->request_transfer == tape->stage_size) 2361 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 2362} 2363 2364static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 2365{ 2366 int size = 32768; 2367 struct idetape_bh *p = bh; 2368 2369 idetape_init_pc(pc); 2370 pc->c[0] = IDETAPE_READ_BUFFER_CMD; 2371 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; 2372 pc->c[7] = size >> 8; 2373 pc->c[8] = size & 0xff; 2374 pc->callback = &idetape_pc_callback; 2375 pc->bh = bh; 2376 atomic_set(&bh->b_count, 0); 2377 pc->buffer = NULL; 2378 while (p) { 2379 atomic_set(&p->b_count, 0); 2380 p = p->b_reqnext; 2381 } 2382 pc->request_transfer = pc->buffer_size = size; 2383} 2384 2385static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) 2386{ 2387 idetape_init_pc(pc); 2388 pc->c[0] = IDETAPE_WRITE_CMD; 2389 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); 2390 pc->c[1] = 1; 2391 pc->callback = &idetape_rw_callback; 2392 set_bit(PC_WRITING, &pc->flags); 2393 pc->bh = bh; 2394 pc->b_data = bh->b_data; 2395 pc->b_count = atomic_read(&bh->b_count); 2396 pc->buffer = NULL; 2397 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; 2398 if (pc->request_transfer == tape->stage_size) 2399 set_bit(PC_DMA_RECOMMENDED, &pc->flags); 2400} 2401 2402/* 2403 * idetape_do_request is our request handling function. 2404 */ 2405static ide_startstop_t idetape_do_request(ide_drive_t *drive, 2406 struct request *rq, sector_t block) 2407{ 2408 idetape_tape_t *tape = drive->driver_data; 2409 idetape_pc_t *pc = NULL; 2410 struct request *postponed_rq = tape->postponed_rq; 2411 u8 stat; 2412 2413#if IDETAPE_DEBUG_LOG 2414#if 0 2415 if (tape->debug_level >= 5) 2416 printk(KERN_INFO "ide-tape: %d, " 2417 "dev: %s, cmd: %ld, errors: %d\n", 2418 rq->rq_disk->disk_name, rq->cmd[0], rq->errors); 2419#endif 2420 if (tape->debug_level >= 2) 2421 printk(KERN_INFO "ide-tape: sector: %ld, " 2422 "nr_sectors: %ld, current_nr_sectors: %d\n", 2423 rq->sector, rq->nr_sectors, rq->current_nr_sectors); 2424#endif /* IDETAPE_DEBUG_LOG */ 2425 2426 if (!blk_special_request(rq)) { 2427 /* 2428 * We do not support buffer cache originated requests. 2429 */ 2430 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " 2431 "request queue (%d)\n", drive->name, rq->cmd_type); 2432 ide_end_request(drive, 0, 0); 2433 return ide_stopped; 2434 } 2435 2436 /* 2437 * Retry a failed packet command 2438 */ 2439 if (tape->failed_pc != NULL && 2440 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { 2441 return idetape_issue_packet_command(drive, tape->failed_pc); 2442 } 2443#if IDETAPE_DEBUG_BUGS 2444 if (postponed_rq != NULL) 2445 if (rq != postponed_rq) { 2446 printk(KERN_ERR "ide-tape: ide-tape.c bug - " 2447 "Two DSC requests were queued\n"); 2448 idetape_end_request(drive, 0, 0); 2449 return ide_stopped; 2450 } 2451#endif /* IDETAPE_DEBUG_BUGS */ 2452 2453 tape->postponed_rq = NULL; 2454 2455 /* 2456 * If the tape is still busy, postpone our request and service 2457 * the other device meanwhile. 2458 */ 2459 stat = drive->hwif->INB(IDE_STATUS_REG); 2460 2461 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) 2462 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 2463 2464 if (drive->post_reset == 1) { 2465 set_bit(IDETAPE_IGNORE_DSC, &tape->flags); 2466 drive->post_reset = 0; 2467 } 2468 2469 if (tape->tape_still_time > 100 && tape->tape_still_time < 200) 2470 tape->measure_insert_time = 1; 2471 if (time_after(jiffies, tape->insert_time)) 2472 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); 2473 calculate_speeds(drive); 2474 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && 2475 (stat & SEEK_STAT) == 0) { 2476 if (postponed_rq == NULL) { 2477 tape->dsc_polling_start = jiffies; 2478 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; 2479 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; 2480 } else if (time_after(jiffies, tape->dsc_timeout)) { 2481 printk(KERN_ERR "ide-tape: %s: DSC timeout\n", 2482 tape->name); 2483 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 2484 idetape_media_access_finished(drive); 2485 return ide_stopped; 2486 } else { 2487 return ide_do_reset(drive); 2488 } 2489 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD)) 2490 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; 2491 idetape_postpone_request(drive); 2492 return ide_stopped; 2493 } 2494 if (rq->cmd[0] & REQ_IDETAPE_READ) { 2495 tape->buffer_head++; 2496 tape->postpone_cnt = 0; 2497 pc = idetape_next_pc_storage(drive); 2498 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2499 goto out; 2500 } 2501 if (rq->cmd[0] & REQ_IDETAPE_WRITE) { 2502 tape->buffer_head++; 2503 tape->postpone_cnt = 0; 2504 pc = idetape_next_pc_storage(drive); 2505 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2506 goto out; 2507 } 2508 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { 2509 tape->postpone_cnt = 0; 2510 pc = idetape_next_pc_storage(drive); 2511 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); 2512 goto out; 2513 } 2514 if (rq->cmd[0] & REQ_IDETAPE_PC1) { 2515 pc = (idetape_pc_t *) rq->buffer; 2516 rq->cmd[0] &= ~(REQ_IDETAPE_PC1); 2517 rq->cmd[0] |= REQ_IDETAPE_PC2; 2518 goto out; 2519 } 2520 if (rq->cmd[0] & REQ_IDETAPE_PC2) { 2521 idetape_media_access_finished(drive); 2522 return ide_stopped; 2523 } 2524 BUG(); 2525out: 2526 return idetape_issue_packet_command(drive, pc); 2527} 2528 2529/* 2530 * Pipeline related functions 2531 */ 2532static inline int idetape_pipeline_active (idetape_tape_t *tape) 2533{ 2534 int rc1, rc2; 2535 2536 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 2537 rc2 = (tape->active_data_request != NULL); 2538 return rc1; 2539} 2540 2541/* 2542 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline 2543 * stage, along with all the necessary small buffers which together make 2544 * a buffer of size tape->stage_size (or a bit more). We attempt to 2545 * combine sequential pages as much as possible. 2546 * 2547 * Returns a pointer to the new allocated stage, or NULL if we 2548 * can't (or don't want to) allocate a stage. 2549 * 2550 * Pipeline stages are optional and are used to increase performance. 2551 * If we can't allocate them, we'll manage without them. 2552 */ 2553static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) 2554{ 2555 idetape_stage_t *stage; 2556 struct idetape_bh *prev_bh, *bh; 2557 int pages = tape->pages_per_stage; 2558 char *b_data = NULL; 2559 2560 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) 2561 return NULL; 2562 stage->next = NULL; 2563 2564 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); 2565 if (bh == NULL) 2566 goto abort; 2567 bh->b_reqnext = NULL; 2568 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2569 goto abort; 2570 if (clear) 2571 memset(bh->b_data, 0, PAGE_SIZE); 2572 bh->b_size = PAGE_SIZE; 2573 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2574 2575 while (--pages) { 2576 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) 2577 goto abort; 2578 if (clear) 2579 memset(b_data, 0, PAGE_SIZE); 2580 if (bh->b_data == b_data + PAGE_SIZE) { 2581 bh->b_size += PAGE_SIZE; 2582 bh->b_data -= PAGE_SIZE; 2583 if (full) 2584 atomic_add(PAGE_SIZE, &bh->b_count); 2585 continue; 2586 } 2587 if (b_data == bh->b_data + bh->b_size) { 2588 bh->b_size += PAGE_SIZE; 2589 if (full) 2590 atomic_add(PAGE_SIZE, &bh->b_count); 2591 continue; 2592 } 2593 prev_bh = bh; 2594 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { 2595 free_page((unsigned long) b_data); 2596 goto abort; 2597 } 2598 bh->b_reqnext = NULL; 2599 bh->b_data = b_data; 2600 bh->b_size = PAGE_SIZE; 2601 atomic_set(&bh->b_count, full ? bh->b_size : 0); 2602 prev_bh->b_reqnext = bh; 2603 } 2604 bh->b_size -= tape->excess_bh_size; 2605 if (full) 2606 atomic_sub(tape->excess_bh_size, &bh->b_count); 2607 return stage; 2608abort: 2609 __idetape_kfree_stage(stage); 2610 return NULL; 2611} 2612 2613static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) 2614{ 2615 idetape_stage_t *cache_stage = tape->cache_stage; 2616 2617#if IDETAPE_DEBUG_LOG 2618 if (tape->debug_level >= 4) 2619 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); 2620#endif /* IDETAPE_DEBUG_LOG */ 2621 2622 if (tape->nr_stages >= tape->max_stages) 2623 return NULL; 2624 if (cache_stage != NULL) { 2625 tape->cache_stage = NULL; 2626 return cache_stage; 2627 } 2628 return __idetape_kmalloc_stage(tape, 0, 0); 2629} 2630 2631static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) 2632{ 2633 struct idetape_bh *bh = tape->bh; 2634 int count; 2635 int ret = 0; 2636 2637 while (n) { 2638#if IDETAPE_DEBUG_BUGS 2639 if (bh == NULL) { 2640 printk(KERN_ERR "ide-tape: bh == NULL in " 2641 "idetape_copy_stage_from_user\n"); 2642 return 1; 2643 } 2644#endif /* IDETAPE_DEBUG_BUGS */ 2645 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); 2646 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count)) 2647 ret = 1; 2648 n -= count; 2649 atomic_add(count, &bh->b_count); 2650 buf += count; 2651 if (atomic_read(&bh->b_count) == bh->b_size) { 2652 bh = bh->b_reqnext; 2653 if (bh) 2654 atomic_set(&bh->b_count, 0); 2655 } 2656 } 2657 tape->bh = bh; 2658 return ret; 2659} 2660 2661static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) 2662{ 2663 struct idetape_bh *bh = tape->bh; 2664 int count; 2665 int ret = 0; 2666 2667 while (n) { 2668#if IDETAPE_DEBUG_BUGS 2669 if (bh == NULL) { 2670 printk(KERN_ERR "ide-tape: bh == NULL in " 2671 "idetape_copy_stage_to_user\n"); 2672 return 1; 2673 } 2674#endif /* IDETAPE_DEBUG_BUGS */ 2675 count = min(tape->b_count, n); 2676 if (copy_to_user(buf, tape->b_data, count)) 2677 ret = 1; 2678 n -= count; 2679 tape->b_data += count; 2680 tape->b_count -= count; 2681 buf += count; 2682 if (!tape->b_count) { 2683 tape->bh = bh = bh->b_reqnext; 2684 if (bh) { 2685 tape->b_data = bh->b_data; 2686 tape->b_count = atomic_read(&bh->b_count); 2687 } 2688 } 2689 } 2690 return ret; 2691} 2692 2693static void idetape_init_merge_stage (idetape_tape_t *tape) 2694{ 2695 struct idetape_bh *bh = tape->merge_stage->bh; 2696 2697 tape->bh = bh; 2698 if (tape->chrdev_direction == idetape_direction_write) 2699 atomic_set(&bh->b_count, 0); 2700 else { 2701 tape->b_data = bh->b_data; 2702 tape->b_count = atomic_read(&bh->b_count); 2703 } 2704} 2705 2706static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) 2707{ 2708 struct idetape_bh *tmp; 2709 2710 tmp = stage->bh; 2711 stage->bh = tape->merge_stage->bh; 2712 tape->merge_stage->bh = tmp; 2713 idetape_init_merge_stage(tape); 2714} 2715 2716/* 2717 * idetape_add_stage_tail adds a new stage at the end of the pipeline. 2718 */ 2719static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) 2720{ 2721 idetape_tape_t *tape = drive->driver_data; 2722 unsigned long flags; 2723 2724#if IDETAPE_DEBUG_LOG 2725 if (tape->debug_level >= 4) 2726 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); 2727#endif /* IDETAPE_DEBUG_LOG */ 2728 spin_lock_irqsave(&tape->spinlock, flags); 2729 stage->next = NULL; 2730 if (tape->last_stage != NULL) 2731 tape->last_stage->next=stage; 2732 else 2733 tape->first_stage = tape->next_stage=stage; 2734 tape->last_stage = stage; 2735 if (tape->next_stage == NULL) 2736 tape->next_stage = tape->last_stage; 2737 tape->nr_stages++; 2738 tape->nr_pending_stages++; 2739 spin_unlock_irqrestore(&tape->spinlock, flags); 2740} 2741 2742/* 2743 * idetape_wait_for_request installs a completion in a pending request 2744 * and sleeps until it is serviced. 2745 * 2746 * The caller should ensure that the request will not be serviced 2747 * before we install the completion (usually by disabling interrupts). 2748 */ 2749static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) 2750{ 2751 DECLARE_COMPLETION_ONSTACK(wait); 2752 idetape_tape_t *tape = drive->driver_data; 2753 2754#if IDETAPE_DEBUG_BUGS 2755 if (rq == NULL || !blk_special_request(rq)) { 2756 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); 2757 return; 2758 } 2759#endif /* IDETAPE_DEBUG_BUGS */ 2760 rq->end_io_data = &wait; 2761 rq->end_io = blk_end_sync_rq; 2762 spin_unlock_irq(&tape->spinlock); 2763 wait_for_completion(&wait); 2764 /* The stage and its struct request have been deallocated */ 2765 spin_lock_irq(&tape->spinlock); 2766} 2767 2768static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) 2769{ 2770 idetape_tape_t *tape = drive->driver_data; 2771 idetape_read_position_result_t *result; 2772 2773#if IDETAPE_DEBUG_LOG 2774 if (tape->debug_level >= 4) 2775 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); 2776#endif /* IDETAPE_DEBUG_LOG */ 2777 2778 if (!tape->pc->error) { 2779 result = (idetape_read_position_result_t *) tape->pc->buffer; 2780#if IDETAPE_DEBUG_LOG 2781 if (tape->debug_level >= 2) 2782 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); 2783 if (tape->debug_level >= 2) 2784 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); 2785#endif /* IDETAPE_DEBUG_LOG */ 2786 if (result->bpu) { 2787 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); 2788 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2789 idetape_end_request(drive, 0, 0); 2790 } else { 2791#if IDETAPE_DEBUG_LOG 2792 if (tape->debug_level >= 2) 2793 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); 2794#endif /* IDETAPE_DEBUG_LOG */ 2795 tape->partition = result->partition; 2796 tape->first_frame_position = ntohl(result->first_block); 2797 tape->last_frame_position = ntohl(result->last_block); 2798 tape->blocks_in_buffer = result->blocks_in_buffer[2]; 2799 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); 2800 idetape_end_request(drive, 1, 0); 2801 } 2802 } else { 2803 idetape_end_request(drive, 0, 0); 2804 } 2805 return ide_stopped; 2806} 2807 2808/* 2809 * idetape_create_write_filemark_cmd will: 2810 * 2811 * 1. Write a filemark if write_filemark=1. 2812 * 2. Flush the device buffers without writing a filemark 2813 * if write_filemark=0. 2814 * 2815 */ 2816static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) 2817{ 2818 idetape_init_pc(pc); 2819 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; 2820 pc->c[4] = write_filemark; 2821 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2822 pc->callback = &idetape_pc_callback; 2823} 2824 2825static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) 2826{ 2827 idetape_init_pc(pc); 2828 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; 2829 pc->callback = &idetape_pc_callback; 2830} 2831 2832/* 2833 * idetape_queue_pc_tail is based on the following functions: 2834 * 2835 * ide_do_drive_cmd from ide.c 2836 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c 2837 * 2838 * We add a special packet command request to the tail of the request 2839 * queue, and wait for it to be serviced. 2840 * 2841 * This is not to be called from within the request handling part 2842 * of the driver ! We allocate here data in the stack, and it is valid 2843 * until the request is finished. This is not the case for the bottom 2844 * part of the driver, where we are always leaving the functions to wait 2845 * for an interrupt or a timer event. 2846 * 2847 * From the bottom part of the driver, we should allocate safe memory 2848 * using idetape_next_pc_storage and idetape_next_rq_storage, and add 2849 * the request to the request list without waiting for it to be serviced ! 2850 * In that case, we usually use idetape_queue_pc_head. 2851 */ 2852static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) 2853{ 2854 struct ide_tape_obj *tape = drive->driver_data; 2855 struct request rq; 2856 2857 idetape_init_rq(&rq, REQ_IDETAPE_PC1); 2858 rq.buffer = (char *) pc; 2859 rq.rq_disk = tape->disk; 2860 return ide_do_drive_cmd(drive, &rq, ide_wait); 2861} 2862 2863static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) 2864{ 2865 idetape_init_pc(pc); 2866 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; 2867 pc->c[4] = cmd; 2868 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2869 pc->callback = &idetape_pc_callback; 2870} 2871 2872static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) 2873{ 2874 idetape_tape_t *tape = drive->driver_data; 2875 idetape_pc_t pc; 2876 int load_attempted = 0; 2877 2878 /* 2879 * Wait for the tape to become ready 2880 */ 2881 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 2882 timeout += jiffies; 2883 while (time_before(jiffies, timeout)) { 2884 idetape_create_test_unit_ready_cmd(&pc); 2885 if (!__idetape_queue_pc_tail(drive, &pc)) 2886 return 0; 2887 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) 2888 || (tape->asc == 0x3A)) { /* no media */ 2889 if (load_attempted) 2890 return -ENOMEDIUM; 2891 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 2892 __idetape_queue_pc_tail(drive, &pc); 2893 load_attempted = 1; 2894 /* not about to be ready */ 2895 } else if (!(tape->sense_key == 2 && tape->asc == 4 && 2896 (tape->ascq == 1 || tape->ascq == 8))) 2897 return -EIO; 2898 msleep(100); 2899 } 2900 return -EIO; 2901} 2902 2903static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) 2904{ 2905 return __idetape_queue_pc_tail(drive, pc); 2906} 2907 2908static int idetape_flush_tape_buffers (ide_drive_t *drive) 2909{ 2910 idetape_pc_t pc; 2911 int rc; 2912 2913 idetape_create_write_filemark_cmd(drive, &pc, 0); 2914 if ((rc = idetape_queue_pc_tail(drive, &pc))) 2915 return rc; 2916 idetape_wait_ready(drive, 60 * 5 * HZ); 2917 return 0; 2918} 2919 2920static void idetape_create_read_position_cmd (idetape_pc_t *pc) 2921{ 2922 idetape_init_pc(pc); 2923 pc->c[0] = IDETAPE_READ_POSITION_CMD; 2924 pc->request_transfer = 20; 2925 pc->callback = &idetape_read_position_callback; 2926} 2927 2928static int idetape_read_position (ide_drive_t *drive) 2929{ 2930 idetape_tape_t *tape = drive->driver_data; 2931 idetape_pc_t pc; 2932 int position; 2933 2934#if IDETAPE_DEBUG_LOG 2935 if (tape->debug_level >= 4) 2936 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); 2937#endif /* IDETAPE_DEBUG_LOG */ 2938 2939 idetape_create_read_position_cmd(&pc); 2940 if (idetape_queue_pc_tail(drive, &pc)) 2941 return -1; 2942 position = tape->first_frame_position; 2943 return position; 2944} 2945 2946static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) 2947{ 2948 idetape_init_pc(pc); 2949 pc->c[0] = IDETAPE_LOCATE_CMD; 2950 pc->c[1] = 2; 2951 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); 2952 pc->c[8] = partition; 2953 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 2954 pc->callback = &idetape_pc_callback; 2955} 2956 2957static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) 2958{ 2959 idetape_tape_t *tape = drive->driver_data; 2960 2961 if (!tape->capabilities.lock) 2962 return 0; 2963 2964 idetape_init_pc(pc); 2965 pc->c[0] = IDETAPE_PREVENT_CMD; 2966 pc->c[4] = prevent; 2967 pc->callback = &idetape_pc_callback; 2968 return 1; 2969} 2970 2971static int __idetape_discard_read_pipeline (ide_drive_t *drive) 2972{ 2973 idetape_tape_t *tape = drive->driver_data; 2974 unsigned long flags; 2975 int cnt; 2976 2977 if (tape->chrdev_direction != idetape_direction_read) 2978 return 0; 2979 2980 /* Remove merge stage. */ 2981 cnt = tape->merge_stage_size / tape->tape_block_size; 2982 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 2983 ++cnt; /* Filemarks count as 1 sector */ 2984 tape->merge_stage_size = 0; 2985 if (tape->merge_stage != NULL) { 2986 __idetape_kfree_stage(tape->merge_stage); 2987 tape->merge_stage = NULL; 2988 } 2989 2990 /* Clear pipeline flags. */ 2991 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 2992 tape->chrdev_direction = idetape_direction_none; 2993 2994 /* Remove pipeline stages. */ 2995 if (tape->first_stage == NULL) 2996 return 0; 2997 2998 spin_lock_irqsave(&tape->spinlock, flags); 2999 tape->next_stage = NULL; 3000 if (idetape_pipeline_active(tape)) 3001 idetape_wait_for_request(drive, tape->active_data_request); 3002 spin_unlock_irqrestore(&tape->spinlock, flags); 3003 3004 while (tape->first_stage != NULL) { 3005 struct request *rq_ptr = &tape->first_stage->rq; 3006 3007 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; 3008 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 3009 ++cnt; 3010 idetape_remove_stage_head(drive); 3011 } 3012 tape->nr_pending_stages = 0; 3013 tape->max_stages = tape->min_pipeline; 3014 return cnt; 3015} 3016 3017/* 3018 * idetape_position_tape positions the tape to the requested block 3019 * using the LOCATE packet command. A READ POSITION command is then 3020 * issued to check where we are positioned. 3021 * 3022 * Like all higher level operations, we queue the commands at the tail 3023 * of the request queue and wait for their completion. 3024 * 3025 */ 3026static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) 3027{ 3028 idetape_tape_t *tape = drive->driver_data; 3029 int retval; 3030 idetape_pc_t pc; 3031 3032 if (tape->chrdev_direction == idetape_direction_read) 3033 __idetape_discard_read_pipeline(drive); 3034 idetape_wait_ready(drive, 60 * 5 * HZ); 3035 idetape_create_locate_cmd(drive, &pc, block, partition, skip); 3036 retval = idetape_queue_pc_tail(drive, &pc); 3037 if (retval) 3038 return (retval); 3039 3040 idetape_create_read_position_cmd(&pc); 3041 return (idetape_queue_pc_tail(drive, &pc)); 3042} 3043 3044static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) 3045{ 3046 idetape_tape_t *tape = drive->driver_data; 3047 int cnt; 3048 int seek, position; 3049 3050 cnt = __idetape_discard_read_pipeline(drive); 3051 if (restore_position) { 3052 position = idetape_read_position(drive); 3053 seek = position > cnt ? position - cnt : 0; 3054 if (idetape_position_tape(drive, seek, 0, 0)) { 3055 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); 3056 return; 3057 } 3058 } 3059} 3060 3061/* 3062 * idetape_queue_rw_tail generates a read/write request for the block 3063 * device interface and wait for it to be serviced. 3064 */ 3065static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) 3066{ 3067 idetape_tape_t *tape = drive->driver_data; 3068 struct request rq; 3069 3070#if IDETAPE_DEBUG_LOG 3071 if (tape->debug_level >= 2) 3072 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); 3073#endif /* IDETAPE_DEBUG_LOG */ 3074#if IDETAPE_DEBUG_BUGS 3075 if (idetape_pipeline_active(tape)) { 3076 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); 3077 return (0); 3078 } 3079#endif /* IDETAPE_DEBUG_BUGS */ 3080 3081 idetape_init_rq(&rq, cmd); 3082 rq.rq_disk = tape->disk; 3083 rq.special = (void *)bh; 3084 rq.sector = tape->first_frame_position; 3085 rq.nr_sectors = rq.current_nr_sectors = blocks; 3086 (void) ide_do_drive_cmd(drive, &rq, ide_wait); 3087 3088 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) 3089 return 0; 3090 3091 if (tape->merge_stage) 3092 idetape_init_merge_stage(tape); 3093 if (rq.errors == IDETAPE_ERROR_GENERAL) 3094 return -EIO; 3095 return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); 3096} 3097 3098/* 3099 * idetape_insert_pipeline_into_queue is used to start servicing the 3100 * pipeline stages, starting from tape->next_stage. 3101 */ 3102static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) 3103{ 3104 idetape_tape_t *tape = drive->driver_data; 3105 3106 if (tape->next_stage == NULL) 3107 return; 3108 if (!idetape_pipeline_active(tape)) { 3109 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); 3110 idetape_active_next_stage(drive); 3111 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); 3112 } 3113} 3114 3115static void idetape_create_inquiry_cmd (idetape_pc_t *pc) 3116{ 3117 idetape_init_pc(pc); 3118 pc->c[0] = IDETAPE_INQUIRY_CMD; 3119 pc->c[4] = pc->request_transfer = 254; 3120 pc->callback = &idetape_pc_callback; 3121} 3122 3123static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) 3124{ 3125 idetape_init_pc(pc); 3126 pc->c[0] = IDETAPE_REWIND_CMD; 3127 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 3128 pc->callback = &idetape_pc_callback; 3129} 3130 3131#if 0 3132static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) 3133{ 3134 idetape_init_pc(pc); 3135 set_bit(PC_WRITING, &pc->flags); 3136 pc->c[0] = IDETAPE_MODE_SELECT_CMD; 3137 pc->c[1] = 0x10; 3138 put_unaligned(htons(length), (unsigned short *) &pc->c[3]); 3139 pc->request_transfer = 255; 3140 pc->callback = &idetape_pc_callback; 3141} 3142#endif 3143 3144static void idetape_create_erase_cmd (idetape_pc_t *pc) 3145{ 3146 idetape_init_pc(pc); 3147 pc->c[0] = IDETAPE_ERASE_CMD; 3148 pc->c[1] = 1; 3149 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 3150 pc->callback = &idetape_pc_callback; 3151} 3152 3153static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) 3154{ 3155 idetape_init_pc(pc); 3156 pc->c[0] = IDETAPE_SPACE_CMD; 3157 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); 3158 pc->c[1] = cmd; 3159 set_bit(PC_WAIT_FOR_DSC, &pc->flags); 3160 pc->callback = &idetape_pc_callback; 3161} 3162 3163static void idetape_wait_first_stage (ide_drive_t *drive) 3164{ 3165 idetape_tape_t *tape = drive->driver_data; 3166 unsigned long flags; 3167 3168 if (tape->first_stage == NULL) 3169 return; 3170 spin_lock_irqsave(&tape->spinlock, flags); 3171 if (tape->active_stage == tape->first_stage) 3172 idetape_wait_for_request(drive, tape->active_data_request); 3173 spin_unlock_irqrestore(&tape->spinlock, flags); 3174} 3175 3176/* 3177 * idetape_add_chrdev_write_request tries to add a character device 3178 * originated write request to our pipeline. In case we don't succeed, 3179 * we revert to non-pipelined operation mode for this request. 3180 * 3181 * 1. Try to allocate a new pipeline stage. 3182 * 2. If we can't, wait for more and more requests to be serviced 3183 * and try again each time. 3184 * 3. If we still can't allocate a stage, fallback to 3185 * non-pipelined operation mode for this request. 3186 */ 3187static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) 3188{ 3189 idetape_tape_t *tape = drive->driver_data; 3190 idetape_stage_t *new_stage; 3191 unsigned long flags; 3192 struct request *rq; 3193 3194#if IDETAPE_DEBUG_LOG 3195 if (tape->debug_level >= 3) 3196 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); 3197#endif /* IDETAPE_DEBUG_LOG */ 3198 3199 /* 3200 * Attempt to allocate a new stage. 3201 * Pay special attention to possible race conditions. 3202 */ 3203 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { 3204 spin_lock_irqsave(&tape->spinlock, flags); 3205 if (idetape_pipeline_active(tape)) { 3206 idetape_wait_for_request(drive, tape->active_data_request); 3207 spin_unlock_irqrestore(&tape->spinlock, flags); 3208 } else { 3209 spin_unlock_irqrestore(&tape->spinlock, flags); 3210 idetape_insert_pipeline_into_queue(drive); 3211 if (idetape_pipeline_active(tape)) 3212 continue; 3213 /* 3214 * Linux is short on memory. Fallback to 3215 * non-pipelined operation mode for this request. 3216 */ 3217 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 3218 } 3219 } 3220 rq = &new_stage->rq; 3221 idetape_init_rq(rq, REQ_IDETAPE_WRITE); 3222 /* Doesn't actually matter - We always assume sequential access */ 3223 rq->sector = tape->first_frame_position; 3224 rq->nr_sectors = rq->current_nr_sectors = blocks; 3225 3226 idetape_switch_buffers(tape, new_stage); 3227 idetape_add_stage_tail(drive, new_stage); 3228 tape->pipeline_head++; 3229 calculate_speeds(drive); 3230 3231 /* 3232 * Estimate whether the tape has stopped writing by checking 3233 * if our write pipeline is currently empty. If we are not 3234 * writing anymore, wait for the pipeline to be full enough 3235 * (90%) before starting to service requests, so that we will 3236 * be able to keep up with the higher speeds of the tape. 3237 */ 3238 if (!idetape_pipeline_active(tape)) { 3239 if (tape->nr_stages >= tape->max_stages * 9 / 10 || 3240 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { 3241 tape->measure_insert_time = 1; 3242 tape->insert_time = jiffies; 3243 tape->insert_size = 0; 3244 tape->insert_speed = 0; 3245 idetape_insert_pipeline_into_queue(drive); 3246 } 3247 } 3248 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 3249 /* Return a deferred error */ 3250 return -EIO; 3251 return blocks; 3252} 3253 3254/* 3255 * idetape_wait_for_pipeline will wait until all pending pipeline 3256 * requests are serviced. Typically called on device close. 3257 */ 3258static void idetape_wait_for_pipeline (ide_drive_t *drive) 3259{ 3260 idetape_tape_t *tape = drive->driver_data; 3261 unsigned long flags; 3262 3263 while (tape->next_stage || idetape_pipeline_active(tape)) { 3264 idetape_insert_pipeline_into_queue(drive); 3265 spin_lock_irqsave(&tape->spinlock, flags); 3266 if (idetape_pipeline_active(tape)) 3267 idetape_wait_for_request(drive, tape->active_data_request); 3268 spin_unlock_irqrestore(&tape->spinlock, flags); 3269 } 3270} 3271 3272static void idetape_empty_write_pipeline (ide_drive_t *drive) 3273{ 3274 idetape_tape_t *tape = drive->driver_data; 3275 int blocks, min; 3276 struct idetape_bh *bh; 3277 3278#if IDETAPE_DEBUG_BUGS 3279 if (tape->chrdev_direction != idetape_direction_write) { 3280 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); 3281 return; 3282 } 3283 if (tape->merge_stage_size > tape->stage_size) { 3284 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); 3285 tape->merge_stage_size = tape->stage_size; 3286 } 3287#endif /* IDETAPE_DEBUG_BUGS */ 3288 if (tape->merge_stage_size) { 3289 blocks = tape->merge_stage_size / tape->tape_block_size; 3290 if (tape->merge_stage_size % tape->tape_block_size) { 3291 unsigned int i; 3292 3293 blocks++; 3294 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; 3295 bh = tape->bh->b_reqnext; 3296 while (bh) { 3297 atomic_set(&bh->b_count, 0); 3298 bh = bh->b_reqnext; 3299 } 3300 bh = tape->bh; 3301 while (i) { 3302 if (bh == NULL) { 3303 3304 printk(KERN_INFO "ide-tape: bug, bh NULL\n"); 3305 break; 3306 } 3307 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); 3308 memset(bh->b_data + atomic_read(&bh->b_count), 0, min); 3309 atomic_add(min, &bh->b_count); 3310 i -= min; 3311 bh = bh->b_reqnext; 3312 } 3313 } 3314 (void) idetape_add_chrdev_write_request(drive, blocks); 3315 tape->merge_stage_size = 0; 3316 } 3317 idetape_wait_for_pipeline(drive); 3318 if (tape->merge_stage != NULL) { 3319 __idetape_kfree_stage(tape->merge_stage); 3320 tape->merge_stage = NULL; 3321 } 3322 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 3323 tape->chrdev_direction = idetape_direction_none; 3324 3325 /* 3326 * On the next backup, perform the feedback loop again. 3327 * (I don't want to keep sense information between backups, 3328 * as some systems are constantly on, and the system load 3329 * can be totally different on the next backup). 3330 */ 3331 tape->max_stages = tape->min_pipeline; 3332#if IDETAPE_DEBUG_BUGS 3333 if (tape->first_stage != NULL || 3334 tape->next_stage != NULL || 3335 tape->last_stage != NULL || 3336 tape->nr_stages != 0) { 3337 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " 3338 "first_stage %p, next_stage %p, " 3339 "last_stage %p, nr_stages %d\n", 3340 tape->first_stage, tape->next_stage, 3341 tape->last_stage, tape->nr_stages); 3342 } 3343#endif /* IDETAPE_DEBUG_BUGS */ 3344} 3345 3346static void idetape_restart_speed_control (ide_drive_t *drive) 3347{ 3348 idetape_tape_t *tape = drive->driver_data; 3349 3350 tape->restart_speed_control_req = 0; 3351 tape->pipeline_head = 0; 3352 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; 3353 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; 3354 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; 3355 tape->uncontrolled_pipeline_head_speed = 0; 3356 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; 3357 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; 3358} 3359 3360static int idetape_initiate_read (ide_drive_t *drive, int max_stages) 3361{ 3362 idetape_tape_t *tape = drive->driver_data; 3363 idetape_stage_t *new_stage; 3364 struct request rq; 3365 int bytes_read; 3366 int blocks = tape->capabilities.ctl; 3367 3368 /* Initialize read operation */ 3369 if (tape->chrdev_direction != idetape_direction_read) { 3370 if (tape->chrdev_direction == idetape_direction_write) { 3371 idetape_empty_write_pipeline(drive); 3372 idetape_flush_tape_buffers(drive); 3373 } 3374#if IDETAPE_DEBUG_BUGS 3375 if (tape->merge_stage || tape->merge_stage_size) { 3376 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); 3377 tape->merge_stage_size = 0; 3378 } 3379#endif /* IDETAPE_DEBUG_BUGS */ 3380 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 3381 return -ENOMEM; 3382 tape->chrdev_direction = idetape_direction_read; 3383 3384 /* 3385 * Issue a read 0 command to ensure that DSC handshake 3386 * is switched from completion mode to buffer available 3387 * mode. 3388 * No point in issuing this if DSC overlap isn't supported, 3389 * some drives (Seagate STT3401A) will return an error. 3390 */ 3391 if (drive->dsc_overlap) { 3392 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); 3393 if (bytes_read < 0) { 3394 __idetape_kfree_stage(tape->merge_stage); 3395 tape->merge_stage = NULL; 3396 tape->chrdev_direction = idetape_direction_none; 3397 return bytes_read; 3398 } 3399 } 3400 } 3401 if (tape->restart_speed_control_req) 3402 idetape_restart_speed_control(drive); 3403 idetape_init_rq(&rq, REQ_IDETAPE_READ); 3404 rq.sector = tape->first_frame_position; 3405 rq.nr_sectors = rq.current_nr_sectors = blocks; 3406 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && 3407 tape->nr_stages < max_stages) { 3408 new_stage = idetape_kmalloc_stage(tape); 3409 while (new_stage != NULL) { 3410 new_stage->rq = rq; 3411 idetape_add_stage_tail(drive, new_stage); 3412 if (tape->nr_stages >= max_stages) 3413 break; 3414 new_stage = idetape_kmalloc_stage(tape); 3415 } 3416 } 3417 if (!idetape_pipeline_active(tape)) { 3418 if (tape->nr_pending_stages >= 3 * max_stages / 4) { 3419 tape->measure_insert_time = 1; 3420 tape->insert_time = jiffies; 3421 tape->insert_size = 0; 3422 tape->insert_speed = 0; 3423 idetape_insert_pipeline_into_queue(drive); 3424 } 3425 } 3426 return 0; 3427} 3428 3429/* 3430 * idetape_add_chrdev_read_request is called from idetape_chrdev_read 3431 * to service a character device read request and add read-ahead 3432 * requests to our pipeline. 3433 */ 3434static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) 3435{ 3436 idetape_tape_t *tape = drive->driver_data; 3437 unsigned long flags; 3438 struct request *rq_ptr; 3439 int bytes_read; 3440 3441#if IDETAPE_DEBUG_LOG 3442 if (tape->debug_level >= 4) 3443 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); 3444#endif /* IDETAPE_DEBUG_LOG */ 3445 3446 /* 3447 * If we are at a filemark, return a read length of 0 3448 */ 3449 if (test_bit(IDETAPE_FILEMARK, &tape->flags)) 3450 return 0; 3451 3452 /* 3453 * Wait for the next block to be available at the head 3454 * of the pipeline 3455 */ 3456 idetape_initiate_read(drive, tape->max_stages); 3457 if (tape->first_stage == NULL) { 3458 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) 3459 return 0; 3460 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); 3461 } 3462 idetape_wait_first_stage(drive); 3463 rq_ptr = &tape->first_stage->rq; 3464 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); 3465 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; 3466 3467 3468 if (rq_ptr->errors == IDETAPE_ERROR_EOD) 3469 return 0; 3470 else { 3471 idetape_switch_buffers(tape, tape->first_stage); 3472 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) 3473 set_bit(IDETAPE_FILEMARK, &tape->flags); 3474 spin_lock_irqsave(&tape->spinlock, flags); 3475 idetape_remove_stage_head(drive); 3476 spin_unlock_irqrestore(&tape->spinlock, flags); 3477 tape->pipeline_head++; 3478 calculate_speeds(drive); 3479 } 3480#if IDETAPE_DEBUG_BUGS 3481 if (bytes_read > blocks * tape->tape_block_size) { 3482 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); 3483 bytes_read = blocks * tape->tape_block_size; 3484 } 3485#endif /* IDETAPE_DEBUG_BUGS */ 3486 return (bytes_read); 3487} 3488 3489static void idetape_pad_zeros (ide_drive_t *drive, int bcount) 3490{ 3491 idetape_tape_t *tape = drive->driver_data; 3492 struct idetape_bh *bh; 3493 int blocks; 3494 3495 while (bcount) { 3496 unsigned int count; 3497 3498 bh = tape->merge_stage->bh; 3499 count = min(tape->stage_size, bcount); 3500 bcount -= count; 3501 blocks = count / tape->tape_block_size; 3502 while (count) { 3503 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); 3504 memset(bh->b_data, 0, atomic_read(&bh->b_count)); 3505 count -= atomic_read(&bh->b_count); 3506 bh = bh->b_reqnext; 3507 } 3508 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); 3509 } 3510} 3511 3512static int idetape_pipeline_size (ide_drive_t *drive) 3513{ 3514 idetape_tape_t *tape = drive->driver_data; 3515 idetape_stage_t *stage; 3516 struct request *rq; 3517 int size = 0; 3518 3519 idetape_wait_for_pipeline(drive); 3520 stage = tape->first_stage; 3521 while (stage != NULL) { 3522 rq = &stage->rq; 3523 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); 3524 if (rq->errors == IDETAPE_ERROR_FILEMARK) 3525 size += tape->tape_block_size; 3526 stage = stage->next; 3527 } 3528 size += tape->merge_stage_size; 3529 return size; 3530} 3531 3532/* 3533 * Rewinds the tape to the Beginning Of the current Partition (BOP). 3534 * 3535 * We currently support only one partition. 3536 */ 3537static int idetape_rewind_tape (ide_drive_t *drive) 3538{ 3539 int retval; 3540 idetape_pc_t pc; 3541#if IDETAPE_DEBUG_LOG 3542 idetape_tape_t *tape = drive->driver_data; 3543 if (tape->debug_level >= 2) 3544 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); 3545#endif /* IDETAPE_DEBUG_LOG */ 3546 3547 idetape_create_rewind_cmd(drive, &pc); 3548 retval = idetape_queue_pc_tail(drive, &pc); 3549 if (retval) 3550 return retval; 3551 3552 idetape_create_read_position_cmd(&pc); 3553 retval = idetape_queue_pc_tail(drive, &pc); 3554 if (retval) 3555 return retval; 3556 return 0; 3557} 3558 3559/* 3560 * Our special ide-tape ioctl's. 3561 * 3562 * Currently there aren't any ioctl's. 3563 * mtio.h compatible commands should be issued to the character device 3564 * interface. 3565 */ 3566static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) 3567{ 3568 idetape_tape_t *tape = drive->driver_data; 3569 idetape_config_t config; 3570 void __user *argp = (void __user *)arg; 3571 3572#if IDETAPE_DEBUG_LOG 3573 if (tape->debug_level >= 4) 3574 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); 3575#endif /* IDETAPE_DEBUG_LOG */ 3576 switch (cmd) { 3577 case 0x0340: 3578 if (copy_from_user(&config, argp, sizeof (idetape_config_t))) 3579 return -EFAULT; 3580 tape->best_dsc_rw_frequency = config.dsc_rw_frequency; 3581 tape->max_stages = config.nr_stages; 3582 break; 3583 case 0x0350: 3584 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; 3585 config.nr_stages = tape->max_stages; 3586 if (copy_to_user(argp, &config, sizeof (idetape_config_t))) 3587 return -EFAULT; 3588 break; 3589 default: 3590 return -EIO; 3591 } 3592 return 0; 3593} 3594 3595/* 3596 * idetape_space_over_filemarks is now a bit more complicated than just 3597 * passing the command to the tape since we may have crossed some 3598 * filemarks during our pipelined read-ahead mode. 3599 * 3600 * As a minor side effect, the pipeline enables us to support MTFSFM when 3601 * the filemark is in our internal pipeline even if the tape doesn't 3602 * support spacing over filemarks in the reverse direction. 3603 */ 3604static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) 3605{ 3606 idetape_tape_t *tape = drive->driver_data; 3607 idetape_pc_t pc; 3608 unsigned long flags; 3609 int retval,count=0; 3610 3611 if (mt_count == 0) 3612 return 0; 3613 if (MTBSF == mt_op || MTBSFM == mt_op) { 3614 if (!tape->capabilities.sprev) 3615 return -EIO; 3616 mt_count = - mt_count; 3617 } 3618 3619 if (tape->chrdev_direction == idetape_direction_read) { 3620 /* 3621 * We have a read-ahead buffer. Scan it for crossed 3622 * filemarks. 3623 */ 3624 tape->merge_stage_size = 0; 3625 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) 3626 ++count; 3627 while (tape->first_stage != NULL) { 3628 if (count == mt_count) { 3629 if (mt_op == MTFSFM) 3630 set_bit(IDETAPE_FILEMARK, &tape->flags); 3631 return 0; 3632 } 3633 spin_lock_irqsave(&tape->spinlock, flags); 3634 if (tape->first_stage == tape->active_stage) { 3635 /* 3636 * We have reached the active stage in the read pipeline. 3637 * There is no point in allowing the drive to continue 3638 * reading any farther, so we stop the pipeline. 3639 * 3640 * This section should be moved to a separate subroutine, 3641 * because a similar function is performed in 3642 * __idetape_discard_read_pipeline(), for example. 3643 */ 3644 tape->next_stage = NULL; 3645 spin_unlock_irqrestore(&tape->spinlock, flags); 3646 idetape_wait_first_stage(drive); 3647 tape->next_stage = tape->first_stage->next; 3648 } else 3649 spin_unlock_irqrestore(&tape->spinlock, flags); 3650 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) 3651 ++count; 3652 idetape_remove_stage_head(drive); 3653 } 3654 idetape_discard_read_pipeline(drive, 0); 3655 } 3656 3657 /* 3658 * The filemark was not found in our internal pipeline. 3659 * Now we can issue the space command. 3660 */ 3661 switch (mt_op) { 3662 case MTFSF: 3663 case MTBSF: 3664 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); 3665 return (idetape_queue_pc_tail(drive, &pc)); 3666 case MTFSFM: 3667 case MTBSFM: 3668 if (!tape->capabilities.sprev) 3669 return (-EIO); 3670 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); 3671 if (retval) return (retval); 3672 count = (MTBSFM == mt_op ? 1 : -1); 3673 return (idetape_space_over_filemarks(drive, MTFSF, count)); 3674 default: 3675 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); 3676 return (-EIO); 3677 } 3678} 3679 3680 3681/* 3682 * Our character device read / write functions. 3683 * 3684 * The tape is optimized to maximize throughput when it is transferring 3685 * an integral number of the "continuous transfer limit", which is 3686 * a parameter of the specific tape (26 KB on my particular tape). 3687 * (32 kB for Onstream) 3688 * 3689 * As of version 1.3 of the driver, the character device provides an 3690 * abstract continuous view of the media - any mix of block sizes (even 1 3691 * byte) on the same backup/restore procedure is supported. The driver 3692 * will internally convert the requests to the recommended transfer unit, 3693 * so that an unmatch between the user's block size to the recommended 3694 * size will only result in a (slightly) increased driver overhead, but 3695 * will no longer hit performance. 3696 * This is not applicable to Onstream. 3697 */ 3698static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, 3699 size_t count, loff_t *ppos) 3700{ 3701 struct ide_tape_obj *tape = ide_tape_f(file); 3702 ide_drive_t *drive = tape->drive; 3703 ssize_t bytes_read,temp, actually_read = 0, rc; 3704 ssize_t ret = 0; 3705 3706#if IDETAPE_DEBUG_LOG 3707 if (tape->debug_level >= 3) 3708 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); 3709#endif /* IDETAPE_DEBUG_LOG */ 3710 3711 if (tape->chrdev_direction != idetape_direction_read) { 3712 if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) 3713 if (count > tape->tape_block_size && 3714 (count % tape->tape_block_size) == 0) 3715 tape->user_bs_factor = count / tape->tape_block_size; 3716 } 3717 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) 3718 return rc; 3719 if (count == 0) 3720 return (0); 3721 if (tape->merge_stage_size) { 3722 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); 3723 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read)) 3724 ret = -EFAULT; 3725 buf += actually_read; 3726 tape->merge_stage_size -= actually_read; 3727 count -= actually_read; 3728 } 3729 while (count >= tape->stage_size) { 3730 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); 3731 if (bytes_read <= 0) 3732 goto finish; 3733 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read)) 3734 ret = -EFAULT; 3735 buf += bytes_read; 3736 count -= bytes_read; 3737 actually_read += bytes_read; 3738 } 3739 if (count) { 3740 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); 3741 if (bytes_read <= 0) 3742 goto finish; 3743 temp = min((unsigned long)count, (unsigned long)bytes_read); 3744 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp)) 3745 ret = -EFAULT; 3746 actually_read += temp; 3747 tape->merge_stage_size = bytes_read-temp; 3748 } 3749finish: 3750 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { 3751#if IDETAPE_DEBUG_LOG 3752 if (tape->debug_level >= 2) 3753 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); 3754#endif 3755 idetape_space_over_filemarks(drive, MTFSF, 1); 3756 return 0; 3757 } 3758 3759 return (ret) ? ret : actually_read; 3760} 3761 3762static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, 3763 size_t count, loff_t *ppos) 3764{ 3765 struct ide_tape_obj *tape = ide_tape_f(file); 3766 ide_drive_t *drive = tape->drive; 3767 ssize_t actually_written = 0; 3768 ssize_t ret = 0; 3769 3770 /* The drive is write protected. */ 3771 if (tape->write_prot) 3772 return -EACCES; 3773 3774#if IDETAPE_DEBUG_LOG 3775 if (tape->debug_level >= 3) 3776 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " 3777 "count %Zd\n", count); 3778#endif /* IDETAPE_DEBUG_LOG */ 3779 3780 /* Initialize write operation */ 3781 if (tape->chrdev_direction != idetape_direction_write) { 3782 if (tape->chrdev_direction == idetape_direction_read) 3783 idetape_discard_read_pipeline(drive, 1); 3784#if IDETAPE_DEBUG_BUGS 3785 if (tape->merge_stage || tape->merge_stage_size) { 3786 printk(KERN_ERR "ide-tape: merge_stage_size " 3787 "should be 0 now\n"); 3788 tape->merge_stage_size = 0; 3789 } 3790#endif /* IDETAPE_DEBUG_BUGS */ 3791 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) 3792 return -ENOMEM; 3793 tape->chrdev_direction = idetape_direction_write; 3794 idetape_init_merge_stage(tape); 3795 3796 /* 3797 * Issue a write 0 command to ensure that DSC handshake 3798 * is switched from completion mode to buffer available 3799 * mode. 3800 * No point in issuing this if DSC overlap isn't supported, 3801 * some drives (Seagate STT3401A) will return an error. 3802 */ 3803 if (drive->dsc_overlap) { 3804 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); 3805 if (retval < 0) { 3806 __idetape_kfree_stage(tape->merge_stage); 3807 tape->merge_stage = NULL; 3808 tape->chrdev_direction = idetape_direction_none; 3809 return retval; 3810 } 3811 } 3812 } 3813 if (count == 0) 3814 return (0); 3815 if (tape->restart_speed_control_req) 3816 idetape_restart_speed_control(drive); 3817 if (tape->merge_stage_size) { 3818#if IDETAPE_DEBUG_BUGS 3819 if (tape->merge_stage_size >= tape->stage_size) { 3820 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); 3821 tape->merge_stage_size = 0; 3822 } 3823#endif /* IDETAPE_DEBUG_BUGS */ 3824 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); 3825 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written)) 3826 ret = -EFAULT; 3827 buf += actually_written; 3828 tape->merge_stage_size += actually_written; 3829 count -= actually_written; 3830 3831 if (tape->merge_stage_size == tape->stage_size) { 3832 ssize_t retval; 3833 tape->merge_stage_size = 0; 3834 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); 3835 if (retval <= 0) 3836 return (retval); 3837 } 3838 } 3839 while (count >= tape->stage_size) { 3840 ssize_t retval; 3841 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size)) 3842 ret = -EFAULT; 3843 buf += tape->stage_size; 3844 count -= tape->stage_size; 3845 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); 3846 actually_written += tape->stage_size; 3847 if (retval <= 0) 3848 return (retval); 3849 } 3850 if (count) { 3851 actually_written += count; 3852 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count)) 3853 ret = -EFAULT; 3854 tape->merge_stage_size += count; 3855 } 3856 return (ret) ? ret : actually_written; 3857} 3858 3859static int idetape_write_filemark (ide_drive_t *drive) 3860{ 3861 idetape_pc_t pc; 3862 3863 /* Write a filemark */ 3864 idetape_create_write_filemark_cmd(drive, &pc, 1); 3865 if (idetape_queue_pc_tail(drive, &pc)) { 3866 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); 3867 return -EIO; 3868 } 3869 return 0; 3870} 3871 3872/* 3873 * idetape_mtioctop is called from idetape_chrdev_ioctl when 3874 * the general mtio MTIOCTOP ioctl is requested. 3875 * 3876 * We currently support the following mtio.h operations: 3877 * 3878 * MTFSF - Space over mt_count filemarks in the positive direction. 3879 * The tape is positioned after the last spaced filemark. 3880 * 3881 * MTFSFM - Same as MTFSF, but the tape is positioned before the 3882 * last filemark. 3883 * 3884 * MTBSF - Steps background over mt_count filemarks, tape is 3885 * positioned before the last filemark. 3886 * 3887 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. 3888 * 3889 * Note: 3890 * 3891 * MTBSF and MTBSFM are not supported when the tape doesn't 3892 * support spacing over filemarks in the reverse direction. 3893 * In this case, MTFSFM is also usually not supported (it is 3894 * supported in the rare case in which we crossed the filemark 3895 * during our read-ahead pipelined operation mode). 3896 * 3897 * MTWEOF - Writes mt_count filemarks. Tape is positioned after 3898 * the last written filemark. 3899 * 3900 * MTREW - Rewinds tape. 3901 * 3902 * MTLOAD - Loads the tape. 3903 * 3904 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and 3905 * MTUNLOAD prevents further access until the media is replaced. 3906 * 3907 * MTNOP - Flushes tape buffers. 3908 * 3909 * MTRETEN - Retension media. This typically consists of one end 3910 * to end pass on the media. 3911 * 3912 * MTEOM - Moves to the end of recorded data. 3913 * 3914 * MTERASE - Erases tape. 3915 * 3916 * MTSETBLK - Sets the user block size to mt_count bytes. If 3917 * mt_count is 0, we will attempt to autodetect 3918 * the block size. 3919 * 3920 * MTSEEK - Positions the tape in a specific block number, where 3921 * each block is assumed to contain which user_block_size 3922 * bytes. 3923 * 3924 * MTSETPART - Switches to another tape partition. 3925 * 3926 * MTLOCK - Locks the tape door. 3927 * 3928 * MTUNLOCK - Unlocks the tape door. 3929 * 3930 * The following commands are currently not supported: 3931 * 3932 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, 3933 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. 3934 */ 3935static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) 3936{ 3937 idetape_tape_t *tape = drive->driver_data; 3938 idetape_pc_t pc; 3939 int i,retval; 3940 3941#if IDETAPE_DEBUG_LOG 3942 if (tape->debug_level >= 1) 3943 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " 3944 "mt_op=%d, mt_count=%d\n", mt_op, mt_count); 3945#endif /* IDETAPE_DEBUG_LOG */ 3946 /* 3947 * Commands which need our pipelined read-ahead stages. 3948 */ 3949 switch (mt_op) { 3950 case MTFSF: 3951 case MTFSFM: 3952 case MTBSF: 3953 case MTBSFM: 3954 if (!mt_count) 3955 return (0); 3956 return (idetape_space_over_filemarks(drive,mt_op,mt_count)); 3957 default: 3958 break; 3959 } 3960 switch (mt_op) { 3961 case MTWEOF: 3962 if (tape->write_prot) 3963 return -EACCES; 3964 idetape_discard_read_pipeline(drive, 1); 3965 for (i = 0; i < mt_count; i++) { 3966 retval = idetape_write_filemark(drive); 3967 if (retval) 3968 return retval; 3969 } 3970 return (0); 3971 case MTREW: 3972 idetape_discard_read_pipeline(drive, 0); 3973 if (idetape_rewind_tape(drive)) 3974 return -EIO; 3975 return 0; 3976 case MTLOAD: 3977 idetape_discard_read_pipeline(drive, 0); 3978 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); 3979 return (idetape_queue_pc_tail(drive, &pc)); 3980 case MTUNLOAD: 3981 case MTOFFL: 3982 /* 3983 * If door is locked, attempt to unlock before 3984 * attempting to eject. 3985 */ 3986 if (tape->door_locked) { 3987 if (idetape_create_prevent_cmd(drive, &pc, 0)) 3988 if (!idetape_queue_pc_tail(drive, &pc)) 3989 tape->door_locked = DOOR_UNLOCKED; 3990 } 3991 idetape_discard_read_pipeline(drive, 0); 3992 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); 3993 retval = idetape_queue_pc_tail(drive, &pc); 3994 if (!retval) 3995 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); 3996 return retval; 3997 case MTNOP: 3998 idetape_discard_read_pipeline(drive, 0); 3999 return (idetape_flush_tape_buffers(drive)); 4000 case MTRETEN: 4001 idetape_discard_read_pipeline(drive, 0); 4002 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); 4003 return (idetape_queue_pc_tail(drive, &pc)); 4004 case MTEOM: 4005 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); 4006 return (idetape_queue_pc_tail(drive, &pc)); 4007 case MTERASE: 4008 (void) idetape_rewind_tape(drive); 4009 idetape_create_erase_cmd(&pc); 4010 return (idetape_queue_pc_tail(drive, &pc)); 4011 case MTSETBLK: 4012 if (mt_count) { 4013 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) 4014 return -EIO; 4015 tape->user_bs_factor = mt_count / tape->tape_block_size; 4016 clear_bit(IDETAPE_DETECT_BS, &tape->flags); 4017 } else 4018 set_bit(IDETAPE_DETECT_BS, &tape->flags); 4019 return 0; 4020 case MTSEEK: 4021 idetape_discard_read_pipeline(drive, 0); 4022 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); 4023 case MTSETPART: 4024 idetape_discard_read_pipeline(drive, 0); 4025 return (idetape_position_tape(drive, 0, mt_count, 0)); 4026 case MTFSR: 4027 case MTBSR: 4028 case MTLOCK: 4029 if (!idetape_create_prevent_cmd(drive, &pc, 1)) 4030 return 0; 4031 retval = idetape_queue_pc_tail(drive, &pc); 4032 if (retval) return retval; 4033 tape->door_locked = DOOR_EXPLICITLY_LOCKED; 4034 return 0; 4035 case MTUNLOCK: 4036 if (!idetape_create_prevent_cmd(drive, &pc, 0)) 4037 return 0; 4038 retval = idetape_queue_pc_tail(drive, &pc); 4039 if (retval) return retval; 4040 tape->door_locked = DOOR_UNLOCKED; 4041 return 0; 4042 default: 4043 printk(KERN_ERR "ide-tape: MTIO operation %d not " 4044 "supported\n", mt_op); 4045 return (-EIO); 4046 } 4047} 4048 4049/* 4050 * Our character device ioctls. 4051 * 4052 * General mtio.h magnetic io commands are supported here, and not in 4053 * the corresponding block interface. 4054 * 4055 * The following ioctls are supported: 4056 * 4057 * MTIOCTOP - Refer to idetape_mtioctop for detailed description. 4058 * 4059 * MTIOCGET - The mt_dsreg field in the returned mtget structure 4060 * will be set to (user block size in bytes << 4061 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. 4062 * 4063 * The mt_blkno is set to the current user block number. 4064 * The other mtget fields are not supported. 4065 * 4066 * MTIOCPOS - The current tape "block position" is returned. We 4067 * assume that each block contains user_block_size 4068 * bytes. 4069 * 4070 * Our own ide-tape ioctls are supported on both interfaces. 4071 */ 4072static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 4073{ 4074 struct ide_tape_obj *tape = ide_tape_f(file); 4075 ide_drive_t *drive = tape->drive; 4076 struct mtop mtop; 4077 struct mtget mtget; 4078 struct mtpos mtpos; 4079 int block_offset = 0, position = tape->first_frame_position; 4080 void __user *argp = (void __user *)arg; 4081 4082#if IDETAPE_DEBUG_LOG 4083 if (tape->debug_level >= 3) 4084 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " 4085 "cmd=%u\n", cmd); 4086#endif /* IDETAPE_DEBUG_LOG */ 4087 4088 tape->restart_speed_control_req = 1; 4089 if (tape->chrdev_direction == idetape_direction_write) { 4090 idetape_empty_write_pipeline(drive); 4091 idetape_flush_tape_buffers(drive); 4092 } 4093 if (cmd == MTIOCGET || cmd == MTIOCPOS) { 4094 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); 4095 if ((position = idetape_read_position(drive)) < 0) 4096 return -EIO; 4097 } 4098 switch (cmd) { 4099 case MTIOCTOP: 4100 if (copy_from_user(&mtop, argp, sizeof (struct mtop))) 4101 return -EFAULT; 4102 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); 4103 case MTIOCGET: 4104 memset(&mtget, 0, sizeof (struct mtget)); 4105 mtget.mt_type = MT_ISSCSI2; 4106 mtget.mt_blkno = position / tape->user_bs_factor - block_offset; 4107 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; 4108 if (tape->drv_write_prot) { 4109 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); 4110 } 4111 if (copy_to_user(argp, &mtget, sizeof(struct mtget))) 4112 return -EFAULT; 4113 return 0; 4114 case MTIOCPOS: 4115 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; 4116 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) 4117 return -EFAULT; 4118 return 0; 4119 default: 4120 if (tape->chrdev_direction == idetape_direction_read) 4121 idetape_discard_read_pipeline(drive, 1); 4122 return idetape_blkdev_ioctl(drive, cmd, arg); 4123 } 4124} 4125 4126static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); 4127 4128/* 4129 * Our character device open function. 4130 */ 4131static int idetape_chrdev_open (struct inode *inode, struct file *filp) 4132{ 4133 unsigned int minor = iminor(inode), i = minor & ~0xc0; 4134 ide_drive_t *drive; 4135 idetape_tape_t *tape; 4136 idetape_pc_t pc; 4137 int retval; 4138 4139 /* 4140 * We really want to do nonseekable_open(inode, filp); here, but some 4141 * versions of tar incorrectly call lseek on tapes and bail out if that 4142 * fails. So we disallow pread() and pwrite(), but permit lseeks. 4143 */ 4144 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 4145 4146#if IDETAPE_DEBUG_LOG 4147 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); 4148#endif /* IDETAPE_DEBUG_LOG */ 4149 4150 if (i >= MAX_HWIFS * MAX_DRIVES) 4151 return -ENXIO; 4152 4153 if (!(tape = ide_tape_chrdev_get(i))) 4154 return -ENXIO; 4155 4156 drive = tape->drive; 4157 4158 filp->private_data = tape; 4159 4160 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { 4161 retval = -EBUSY; 4162 goto out_put_tape; 4163 } 4164 4165 retval = idetape_wait_ready(drive, 60 * HZ); 4166 if (retval) { 4167 clear_bit(IDETAPE_BUSY, &tape->flags); 4168 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); 4169 goto out_put_tape; 4170 } 4171 4172 idetape_read_position(drive); 4173 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) 4174 (void)idetape_rewind_tape(drive); 4175 4176 if (tape->chrdev_direction != idetape_direction_read) 4177 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); 4178 4179 /* Read block size and write protect status from drive. */ 4180 idetape_get_blocksize_from_block_descriptor(drive); 4181 4182 /* Set write protect flag if device is opened as read-only. */ 4183 if ((filp->f_flags & O_ACCMODE) == O_RDONLY) 4184 tape->write_prot = 1; 4185 else 4186 tape->write_prot = tape->drv_write_prot; 4187 4188 /* Make sure drive isn't write protected if user wants to write. */ 4189 if (tape->write_prot) { 4190 if ((filp->f_flags & O_ACCMODE) == O_WRONLY || 4191 (filp->f_flags & O_ACCMODE) == O_RDWR) { 4192 clear_bit(IDETAPE_BUSY, &tape->flags); 4193 retval = -EROFS; 4194 goto out_put_tape; 4195 } 4196 } 4197 4198 /* 4199 * Lock the tape drive door so user can't eject. 4200 */ 4201 if (tape->chrdev_direction == idetape_direction_none) { 4202 if (idetape_create_prevent_cmd(drive, &pc, 1)) { 4203 if (!idetape_queue_pc_tail(drive, &pc)) { 4204 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) 4205 tape->door_locked = DOOR_LOCKED; 4206 } 4207 } 4208 } 4209 idetape_restart_speed_control(drive); 4210 tape->restart_speed_control_req = 0; 4211 return 0; 4212 4213out_put_tape: 4214 ide_tape_put(tape); 4215 return retval; 4216} 4217 4218static void idetape_write_release (ide_drive_t *drive, unsigned int minor) 4219{ 4220 idetape_tape_t *tape = drive->driver_data; 4221 4222 idetape_empty_write_pipeline(drive); 4223 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); 4224 if (tape->merge_stage != NULL) { 4225 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); 4226 __idetape_kfree_stage(tape->merge_stage); 4227 tape->merge_stage = NULL; 4228 } 4229 idetape_write_filemark(drive); 4230 idetape_flush_tape_buffers(drive); 4231 idetape_flush_tape_buffers(drive); 4232} 4233 4234/* 4235 * Our character device release function. 4236 */ 4237static int idetape_chrdev_release (struct inode *inode, struct file *filp) 4238{ 4239 struct ide_tape_obj *tape = ide_tape_f(filp); 4240 ide_drive_t *drive = tape->drive; 4241 idetape_pc_t pc; 4242 unsigned int minor = iminor(inode); 4243 4244 lock_kernel(); 4245 tape = drive->driver_data; 4246#if IDETAPE_DEBUG_LOG 4247 if (tape->debug_level >= 3) 4248 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); 4249#endif /* IDETAPE_DEBUG_LOG */ 4250 4251 if (tape->chrdev_direction == idetape_direction_write) 4252 idetape_write_release(drive, minor); 4253 if (tape->chrdev_direction == idetape_direction_read) { 4254 if (minor < 128) 4255 idetape_discard_read_pipeline(drive, 1); 4256 else 4257 idetape_wait_for_pipeline(drive); 4258 } 4259 if (tape->cache_stage != NULL) { 4260 __idetape_kfree_stage(tape->cache_stage); 4261 tape->cache_stage = NULL; 4262 } 4263 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) 4264 (void) idetape_rewind_tape(drive); 4265 if (tape->chrdev_direction == idetape_direction_none) { 4266 if (tape->door_locked == DOOR_LOCKED) { 4267 if (idetape_create_prevent_cmd(drive, &pc, 0)) { 4268 if (!idetape_queue_pc_tail(drive, &pc)) 4269 tape->door_locked = DOOR_UNLOCKED; 4270 } 4271 } 4272 } 4273 clear_bit(IDETAPE_BUSY, &tape->flags); 4274 ide_tape_put(tape); 4275 unlock_kernel(); 4276 return 0; 4277} 4278 4279/* 4280 * idetape_identify_device is called to check the contents of the 4281 * ATAPI IDENTIFY command results. We return: 4282 * 4283 * 1 If the tape can be supported by us, based on the information 4284 * we have so far. 4285 * 4286 * 0 If this tape driver is not currently supported by us. 4287 */ 4288static int idetape_identify_device (ide_drive_t *drive) 4289{ 4290 struct idetape_id_gcw gcw; 4291 struct hd_driveid *id = drive->id; 4292#if IDETAPE_DEBUG_INFO 4293 unsigned short mask,i; 4294#endif /* IDETAPE_DEBUG_INFO */ 4295 4296 if (drive->id_read == 0) 4297 return 1; 4298 4299 *((unsigned short *) &gcw) = id->config; 4300 4301#if IDETAPE_DEBUG_INFO 4302 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); 4303 printk(KERN_INFO "ide-tape: Protocol Type: "); 4304 switch (gcw.protocol) { 4305 case 0: case 1: printk("ATA\n");break; 4306 case 2: printk("ATAPI\n");break; 4307 case 3: printk("Reserved (Unknown to ide-tape)\n");break; 4308 } 4309 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); 4310 switch (gcw.device_type) { 4311 case 0: printk("Direct-access Device\n");break; 4312 case 1: printk("Streaming Tape Device\n");break; 4313 case 2: case 3: case 4: printk("Reserved\n");break; 4314 case 5: printk("CD-ROM Device\n");break; 4315 case 6: printk("Reserved\n"); 4316 case 7: printk("Optical memory Device\n");break; 4317 case 0x1f: printk("Unknown or no Device type\n");break; 4318 default: printk("Reserved\n"); 4319 } 4320 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); 4321 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); 4322 switch (gcw.drq_type) { 4323 case 0: printk("Microprocessor DRQ\n");break; 4324 case 1: printk("Interrupt DRQ\n");break; 4325 case 2: printk("Accelerated DRQ\n");break; 4326 case 3: printk("Reserved\n");break; 4327 } 4328 printk(KERN_INFO "ide-tape: Command Packet Size: "); 4329 switch (gcw.packet_size) { 4330 case 0: printk("12 bytes\n");break; 4331 case 1: printk("16 bytes\n");break; 4332 default: printk("Reserved\n");break; 4333 } 4334 printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model); 4335 printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); 4336 printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); 4337 printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); 4338 printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); 4339 printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); 4340 printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); 4341 printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); 4342 printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); 4343 printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); 4344 printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); 4345 printk(KERN_INFO "ide-tape: Single Word DMA supported modes: "); 4346 for (i=0,mask=1;i<8;i++,mask=mask << 1) { 4347 if (id->dma_1word & mask) 4348 printk("%d ",i); 4349 if (id->dma_1word & (mask << 8)) 4350 printk("(active) "); 4351 } 4352 printk("\n"); 4353 printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: "); 4354 for (i=0,mask=1;i<8;i++,mask=mask << 1) { 4355 if (id->dma_mword & mask) 4356 printk("%d ",i); 4357 if (id->dma_mword & (mask << 8)) 4358 printk("(active) "); 4359 } 4360 printk("\n"); 4361 if (id->field_valid & 0x0002) { 4362 printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n", 4363 id->eide_pio_modes & 1 ? "Mode 3":"None"); 4364 printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); 4365 if (id->eide_dma_min == 0) 4366 printk("Not supported\n"); 4367 else 4368 printk("%d ns\n",id->eide_dma_min); 4369 4370 printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); 4371 if (id->eide_dma_time == 0) 4372 printk("Not supported\n"); 4373 else 4374 printk("%d ns\n",id->eide_dma_time); 4375 4376 printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); 4377 if (id->eide_pio == 0) 4378 printk("Not supported\n"); 4379 else 4380 printk("%d ns\n",id->eide_pio); 4381 4382 printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); 4383 if (id->eide_pio_iordy == 0) 4384 printk("Not supported\n"); 4385 else 4386 printk("%d ns\n",id->eide_pio_iordy); 4387 4388 } else 4389 printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); 4390#endif /* IDETAPE_DEBUG_INFO */ 4391 4392 /* Check that we can support this device */ 4393 4394 if (gcw.protocol !=2 ) 4395 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); 4396 else if (gcw.device_type != 1) 4397 printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); 4398 else if (!gcw.removable) 4399 printk(KERN_ERR "ide-tape: The removable flag is not set\n"); 4400 else if (gcw.packet_size != 0) { 4401 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); 4402 if (gcw.packet_size == 1) 4403 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); 4404 } else 4405 return 1; 4406 return 0; 4407} 4408 4409/* 4410 * Use INQUIRY to get the firmware revision 4411 */ 4412static void idetape_get_inquiry_results (ide_drive_t *drive) 4413{ 4414 char *r; 4415 idetape_tape_t *tape = drive->driver_data; 4416 idetape_pc_t pc; 4417 idetape_inquiry_result_t *inquiry; 4418 4419 idetape_create_inquiry_cmd(&pc); 4420 if (idetape_queue_pc_tail(drive, &pc)) { 4421 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); 4422 return; 4423 } 4424 inquiry = (idetape_inquiry_result_t *) pc.buffer; 4425 memcpy(tape->vendor_id, inquiry->vendor_id, 8); 4426 memcpy(tape->product_id, inquiry->product_id, 16); 4427 memcpy(tape->firmware_revision, inquiry->revision_level, 4); 4428 ide_fixstring(tape->vendor_id, 10, 0); 4429 ide_fixstring(tape->product_id, 18, 0); 4430 ide_fixstring(tape->firmware_revision, 6, 0); 4431 r = tape->firmware_revision; 4432 if (*(r + 1) == '.') 4433 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; 4434 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); 4435} 4436 4437/* 4438 * idetape_get_mode_sense_results asks the tape about its various 4439 * parameters. In particular, we will adjust our data transfer buffer 4440 * size to the recommended value as returned by the tape. 4441 */ 4442static void idetape_get_mode_sense_results (ide_drive_t *drive) 4443{ 4444 idetape_tape_t *tape = drive->driver_data; 4445 idetape_pc_t pc; 4446 idetape_mode_parameter_header_t *header; 4447 idetape_capabilities_page_t *capabilities; 4448 4449 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); 4450 if (idetape_queue_pc_tail(drive, &pc)) { 4451 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); 4452 tape->tape_block_size = 512; 4453 tape->capabilities.ctl = 52; 4454 tape->capabilities.speed = 450; 4455 tape->capabilities.buffer_size = 6 * 52; 4456 return; 4457 } 4458 header = (idetape_mode_parameter_header_t *) pc.buffer; 4459 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); 4460 4461 capabilities->max_speed = ntohs(capabilities->max_speed); 4462 capabilities->ctl = ntohs(capabilities->ctl); 4463 capabilities->speed = ntohs(capabilities->speed); 4464 capabilities->buffer_size = ntohs(capabilities->buffer_size); 4465 4466 if (!capabilities->speed) { 4467 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); 4468 capabilities->speed = 650; 4469 } 4470 if (!capabilities->max_speed) { 4471 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); 4472 capabilities->max_speed = 650; 4473 } 4474 4475 tape->capabilities = *capabilities; /* Save us a copy */ 4476 if (capabilities->blk512) 4477 tape->tape_block_size = 512; 4478 else if (capabilities->blk1024) 4479 tape->tape_block_size = 1024; 4480 4481#if IDETAPE_DEBUG_INFO 4482 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); 4483 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); 4484 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); 4485 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); 4486 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); 4487 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); 4488 4489 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); 4490 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); 4491 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); 4492 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); 4493 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); 4494 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); 4495 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); 4496 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); 4497 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); 4498 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); 4499 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); 4500 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); 4501 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); 4502 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); 4503 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); 4504 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); 4505 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); 4506 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); 4507 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); 4508 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); 4509#endif /* IDETAPE_DEBUG_INFO */ 4510} 4511 4512/* 4513 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor 4514 * and if it succeeds sets the tape block size with the reported value 4515 */ 4516static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) 4517{ 4518 4519 idetape_tape_t *tape = drive->driver_data; 4520 idetape_pc_t pc; 4521 idetape_mode_parameter_header_t *header; 4522 idetape_parameter_block_descriptor_t *block_descrp; 4523 4524 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); 4525 if (idetape_queue_pc_tail(drive, &pc)) { 4526 printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); 4527 if (tape->tape_block_size == 0) { 4528 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); 4529 tape->tape_block_size = 32768; 4530 } 4531 return; 4532 } 4533 header = (idetape_mode_parameter_header_t *) pc.buffer; 4534 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); 4535 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; 4536 tape->drv_write_prot = (header->dsp & 0x80) >> 7; 4537 4538#if IDETAPE_DEBUG_INFO 4539 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); 4540#endif /* IDETAPE_DEBUG_INFO */ 4541} 4542 4543#ifdef CONFIG_IDE_PROC_FS 4544static void idetape_add_settings (ide_drive_t *drive) 4545{ 4546 idetape_tape_t *tape = drive->driver_data; 4547 4548/* 4549 * drive setting name read/write data type min max mul_factor div_factor data pointer set function 4550 */ 4551 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); 4552 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); 4553 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); 4554 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); 4555 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); 4556 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); 4557 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); 4558 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); 4559 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); 4560 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); 4561 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); 4562 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL); 4563 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); 4564 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); 4565} 4566#else 4567static inline void idetape_add_settings(ide_drive_t *drive) { ; } 4568#endif 4569 4570/* 4571 * ide_setup is called to: 4572 * 4573 * 1. Initialize our various state variables. 4574 * 2. Ask the tape for its capabilities. 4575 * 3. Allocate a buffer which will be used for data 4576 * transfer. The buffer size is chosen based on 4577 * the recommendation which we received in step (2). 4578 * 4579 * Note that at this point ide.c already assigned us an irq, so that 4580 * we can queue requests here and wait for their completion. 4581 */ 4582static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) 4583{ 4584 unsigned long t1, tmid, tn, t; 4585 int speed; 4586 struct idetape_id_gcw gcw; 4587 int stage_size; 4588 struct sysinfo si; 4589 4590 spin_lock_init(&tape->spinlock); 4591 drive->dsc_overlap = 1; 4592#ifdef CONFIG_BLK_DEV_IDEPCI 4593 if (HWIF(drive)->pci_dev != NULL) { 4594 /* 4595 * These two ide-pci host adapters appear to need DSC overlap disabled. 4596 * This probably needs further analysis. 4597 */ 4598 if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || 4599 (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { 4600 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); 4601 drive->dsc_overlap = 0; 4602 } 4603 } 4604#endif /* CONFIG_BLK_DEV_IDEPCI */ 4605 /* Seagate Travan drives do not support DSC overlap. */ 4606 if (strstr(drive->id->model, "Seagate STT3401")) 4607 drive->dsc_overlap = 0; 4608 tape->minor = minor; 4609 tape->name[0] = 'h'; 4610 tape->name[1] = 't'; 4611 tape->name[2] = '0' + minor; 4612 tape->chrdev_direction = idetape_direction_none; 4613 tape->pc = tape->pc_stack; 4614 tape->max_insert_speed = 10000; 4615 tape->speed_control = 1; 4616 *((unsigned short *) &gcw) = drive->id->config; 4617 if (gcw.drq_type == 1) 4618 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); 4619 4620 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; 4621 4622 idetape_get_inquiry_results(drive); 4623 idetape_get_mode_sense_results(drive); 4624 idetape_get_blocksize_from_block_descriptor(drive); 4625 tape->user_bs_factor = 1; 4626 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 4627 while (tape->stage_size > 0xffff) { 4628 printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); 4629 tape->capabilities.ctl /= 2; 4630 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; 4631 } 4632 stage_size = tape->stage_size; 4633 tape->pages_per_stage = stage_size / PAGE_SIZE; 4634 if (stage_size % PAGE_SIZE) { 4635 tape->pages_per_stage++; 4636 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; 4637 } 4638 4639 /* 4640 * Select the "best" DSC read/write polling frequency 4641 * and pipeline size. 4642 */ 4643 speed = max(tape->capabilities.speed, tape->capabilities.max_speed); 4644 4645 tape->max_stages = speed * 1000 * 10 / tape->stage_size; 4646 4647 /* 4648 * Limit memory use for pipeline to 10% of physical memory 4649 */ 4650 si_meminfo(&si); 4651 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) 4652 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); 4653 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); 4654 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); 4655 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); 4656 if (tape->max_stages == 0) 4657 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; 4658 4659 t1 = (tape->stage_size * HZ) / (speed * 1000); 4660 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); 4661 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); 4662 4663 if (tape->max_stages) 4664 t = tn; 4665 else 4666 t = t1; 4667 4668 /* 4669 * Ensure that the number we got makes sense; limit 4670 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. 4671 */ 4672 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); 4673 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " 4674 "%dkB pipeline, %lums tDSC%s\n", 4675 drive->name, tape->name, tape->capabilities.speed, 4676 (tape->capabilities.buffer_size * 512) / tape->stage_size, 4677 tape->stage_size / 1024, 4678 tape->max_stages * tape->stage_size / 1024, 4679 tape->best_dsc_rw_frequency * 1000 / HZ, 4680 drive->using_dma ? ", DMA":""); 4681 4682 idetape_add_settings(drive); 4683} 4684 4685static void ide_tape_remove(ide_drive_t *drive) 4686{ 4687 idetape_tape_t *tape = drive->driver_data; 4688 4689 ide_proc_unregister_driver(drive, tape->driver); 4690 4691 ide_unregister_region(tape->disk); 4692 4693 ide_tape_put(tape); 4694} 4695 4696static void ide_tape_release(struct kref *kref) 4697{ 4698 struct ide_tape_obj *tape = to_ide_tape(kref); 4699 ide_drive_t *drive = tape->drive; 4700 struct gendisk *g = tape->disk; 4701 4702 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); 4703 4704 drive->dsc_overlap = 0; 4705 drive->driver_data = NULL; 4706 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); 4707 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128)); 4708 idetape_devs[tape->minor] = NULL; 4709 g->private_data = NULL; 4710 put_disk(g); 4711 kfree(tape); 4712} 4713 4714#ifdef CONFIG_IDE_PROC_FS 4715static int proc_idetape_read_name 4716 (char *page, char **start, off_t off, int count, int *eof, void *data) 4717{ 4718 ide_drive_t *drive = (ide_drive_t *) data; 4719 idetape_tape_t *tape = drive->driver_data; 4720 char *out = page; 4721 int len; 4722 4723 len = sprintf(out, "%s\n", tape->name); 4724 PROC_IDE_READ_RETURN(page, start, off, count, eof, len); 4725} 4726 4727static ide_proc_entry_t idetape_proc[] = { 4728 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, 4729 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, 4730 { NULL, 0, NULL, NULL } 4731}; 4732#endif 4733 4734static int ide_tape_probe(ide_drive_t *); 4735 4736static ide_driver_t idetape_driver = { 4737 .gen_driver = { 4738 .owner = THIS_MODULE, 4739 .name = "ide-tape", 4740 .bus = &ide_bus_type, 4741 }, 4742 .probe = ide_tape_probe, 4743 .remove = ide_tape_remove, 4744 .version = IDETAPE_VERSION, 4745 .media = ide_tape, 4746 .supports_dsc_overlap = 1, 4747 .do_request = idetape_do_request, 4748 .end_request = idetape_end_request, 4749 .error = __ide_error, 4750 .abort = __ide_abort, 4751#ifdef CONFIG_IDE_PROC_FS 4752 .proc = idetape_proc, 4753#endif 4754}; 4755 4756/* 4757 * Our character device supporting functions, passed to register_chrdev. 4758 */ 4759static const struct file_operations idetape_fops = { 4760 .owner = THIS_MODULE, 4761 .read = idetape_chrdev_read, 4762 .write = idetape_chrdev_write, 4763 .ioctl = idetape_chrdev_ioctl, 4764 .open = idetape_chrdev_open, 4765 .release = idetape_chrdev_release, 4766}; 4767 4768static int idetape_open(struct inode *inode, struct file *filp) 4769{ 4770 struct gendisk *disk = inode->i_bdev->bd_disk; 4771 struct ide_tape_obj *tape; 4772 4773 if (!(tape = ide_tape_get(disk))) 4774 return -ENXIO; 4775 4776 return 0; 4777} 4778 4779static int idetape_release(struct inode *inode, struct file *filp) 4780{ 4781 struct gendisk *disk = inode->i_bdev->bd_disk; 4782 struct ide_tape_obj *tape = ide_tape_g(disk); 4783 4784 ide_tape_put(tape); 4785 4786 return 0; 4787} 4788 4789static int idetape_ioctl(struct inode *inode, struct file *file, 4790 unsigned int cmd, unsigned long arg) 4791{ 4792 struct block_device *bdev = inode->i_bdev; 4793 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); 4794 ide_drive_t *drive = tape->drive; 4795 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 4796 if (err == -EINVAL) 4797 err = idetape_blkdev_ioctl(drive, cmd, arg); 4798 return err; 4799} 4800 4801static struct block_device_operations idetape_block_ops = { 4802 .owner = THIS_MODULE, 4803 .open = idetape_open, 4804 .release = idetape_release, 4805 .ioctl = idetape_ioctl, 4806}; 4807 4808static int ide_tape_probe(ide_drive_t *drive) 4809{ 4810 idetape_tape_t *tape; 4811 struct gendisk *g; 4812 int minor; 4813 4814 if (!strstr("ide-tape", drive->driver_req)) 4815 goto failed; 4816 if (!drive->present) 4817 goto failed; 4818 if (drive->media != ide_tape) 4819 goto failed; 4820 if (!idetape_identify_device (drive)) { 4821 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); 4822 goto failed; 4823 } 4824 if (drive->scsi) { 4825 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); 4826 goto failed; 4827 } 4828 if (strstr(drive->id->model, "OnStream DI-")) { 4829 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); 4830 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); 4831 } 4832 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL); 4833 if (tape == NULL) { 4834 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); 4835 goto failed; 4836 } 4837 4838 g = alloc_disk(1 << PARTN_BITS); 4839 if (!g) 4840 goto out_free_tape; 4841 4842 ide_init_disk(g, drive); 4843 4844 ide_proc_register_driver(drive, &idetape_driver); 4845 4846 kref_init(&tape->kref); 4847 4848 tape->drive = drive; 4849 tape->driver = &idetape_driver; 4850 tape->disk = g; 4851 4852 g->private_data = &tape->driver; 4853 4854 drive->driver_data = tape; 4855 4856 mutex_lock(&idetape_ref_mutex); 4857 for (minor = 0; idetape_devs[minor]; minor++) 4858 ; 4859 idetape_devs[minor] = tape; 4860 mutex_unlock(&idetape_ref_mutex); 4861 4862 idetape_setup(drive, tape, minor); 4863 4864 device_create(idetape_sysfs_class, &drive->gendev, 4865 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name); 4866 device_create(idetape_sysfs_class, &drive->gendev, 4867 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name); 4868 4869 g->fops = &idetape_block_ops; 4870 ide_register_region(g); 4871 4872 return 0; 4873 4874out_free_tape: 4875 kfree(tape); 4876failed: 4877 return -ENODEV; 4878} 4879 4880MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); 4881MODULE_LICENSE("GPL"); 4882 4883static void __exit idetape_exit (void) 4884{ 4885 driver_unregister(&idetape_driver.gen_driver); 4886 class_destroy(idetape_sysfs_class); 4887 unregister_chrdev(IDETAPE_MAJOR, "ht"); 4888} 4889 4890static int __init idetape_init(void) 4891{ 4892 int error = 1; 4893 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); 4894 if (IS_ERR(idetape_sysfs_class)) { 4895 idetape_sysfs_class = NULL; 4896 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); 4897 error = -EBUSY; 4898 goto out; 4899 } 4900 4901 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { 4902 printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); 4903 error = -EBUSY; 4904 goto out_free_class; 4905 } 4906 4907 error = driver_register(&idetape_driver.gen_driver); 4908 if (error) 4909 goto out_free_driver; 4910 4911 return 0; 4912 4913out_free_driver: 4914 driver_unregister(&idetape_driver.gen_driver); 4915out_free_class: 4916 class_destroy(idetape_sysfs_class); 4917out: 4918 return error; 4919} 4920 4921MODULE_ALIAS("ide:*m-tape*"); 4922module_init(idetape_init); 4923module_exit(idetape_exit); 4924MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); 4925