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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427#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>
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -0800435#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436#include <linux/major.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437#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>
Arjan van de Vencf8b8972006-03-23 03:00:45 -0800445#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
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
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200568 * interactive response, while using a high value might improve system
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 * 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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 * 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 {
Stephen Rothwellab057962007-08-01 23:46:44 +0200632 u32 b_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 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
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001003static DEFINE_MUTEX(idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
Will Dysond5dee802005-09-16 02:55:07 -07001005static struct class *idetape_sysfs_class;
1006
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007#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
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001016 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 tape = ide_tape_g(disk);
1018 if (tape)
1019 kref_get(&tape->kref);
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001020 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 return tape;
1022}
1023
1024static void ide_tape_release(struct kref *);
1025
1026static void ide_tape_put(struct ide_tape_obj *tape)
1027{
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001028 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 kref_put(&tape->kref, ide_tape_release);
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001030 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031}
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
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001282 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 tape = idetape_devs[i];
1284 if (tape)
1285 kref_get(&tape->kref);
Arjan van de Vencf8b8972006-03-23 03:00:45 -08001286 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 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));
Jens Axboe4aff5e22006-08-10 08:44:47 +02001768 rq->cmd_type = REQ_TYPE_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811
Bartlomiej Zolnierkiewicz0e38a662008-01-25 22:17:12 +01001812 (void)drive->hwif->INB(IDE_ERROR_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 atapi_ireason_t ireason;
1851 idetape_pc_t *pc = tape->pc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 unsigned int temp;
1853#if SIMULATE_ERRORS
1854 static int error_sim_count = 0;
1855#endif
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001856 u16 bcount;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001857 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858
1859#if IDETAPE_DEBUG_LOG
1860 if (tape->debug_level >= 4)
1861 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
1862 "interrupt handler\n");
1863#endif /* IDETAPE_DEBUG_LOG */
1864
1865 /* Clear the interrupt */
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001866 stat = hwif->INB(IDE_STATUS_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867
1868 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001869 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 /*
1871 * A DMA error is sometimes expected. For example,
1872 * if the tape is crossing a filemark during a
1873 * READ command, it will issue an irq and position
1874 * itself before the filemark, so that only a partial
1875 * data transfer will occur (which causes the DMA
1876 * error). In that case, we will later ask the tape
1877 * how much bytes of the original request were
1878 * actually transferred (we can't receive that
1879 * information from the DMA engine on most chipsets).
1880 */
1881
1882 /*
1883 * On the contrary, a DMA error is never expected;
1884 * it usually indicates a hardware error or abort.
1885 * If the tape crosses a filemark during a READ
1886 * command, it will issue an irq and position itself
1887 * after the filemark (not before). Only a partial
1888 * data transfer will occur, but no DMA error.
1889 * (AS, 19 Apr 2001)
1890 */
1891 set_bit(PC_DMA_ERROR, &pc->flags);
1892 } else {
1893 pc->actually_transferred = pc->request_transfer;
1894 idetape_update_buffers(pc);
1895 }
1896#if IDETAPE_DEBUG_LOG
1897 if (tape->debug_level >= 4)
1898 printk(KERN_INFO "ide-tape: DMA finished\n");
1899#endif /* IDETAPE_DEBUG_LOG */
1900 }
1901
1902 /* No more interrupts */
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001903 if ((stat & DRQ_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904#if IDETAPE_DEBUG_LOG
1905 if (tape->debug_level >= 2)
1906 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
1907#endif /* IDETAPE_DEBUG_LOG */
1908 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1909
1910 local_irq_enable();
1911
1912#if SIMULATE_ERRORS
1913 if ((pc->c[0] == IDETAPE_WRITE_CMD ||
1914 pc->c[0] == IDETAPE_READ_CMD) &&
1915 (++error_sim_count % 100) == 0) {
1916 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1917 tape->name);
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001918 stat |= ERR_STAT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 }
1920#endif
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001921 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
1922 stat &= ~ERR_STAT;
1923 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
1924 /* Error detected */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925#if IDETAPE_DEBUG_LOG
1926 if (tape->debug_level >= 1)
1927 printk(KERN_INFO "ide-tape: %s: I/O error\n",
1928 tape->name);
1929#endif /* IDETAPE_DEBUG_LOG */
1930 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1931 printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
1932 return ide_do_reset(drive);
1933 }
1934#if IDETAPE_DEBUG_LOG
1935 if (tape->debug_level >= 1)
1936 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
1937#endif
1938 /* Retry operation */
1939 return idetape_retry_pc(drive);
1940 }
1941 pc->error = 0;
1942 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01001943 (stat & SEEK_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 /* Media access command */
1945 tape->dsc_polling_start = jiffies;
1946 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
1947 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1948 /* Allow ide.c to handle other requests */
1949 idetape_postpone_request(drive);
1950 return ide_stopped;
1951 }
1952 if (tape->failed_pc == pc)
1953 tape->failed_pc = NULL;
1954 /* Command finished - Call the callback function */
1955 return pc->callback(drive);
1956 }
1957 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1958 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1959 "interrupts in DMA mode\n");
1960 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +01001961 ide_dma_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 return ide_do_reset(drive);
1963 }
1964 /* Get the number of bytes to transfer on this interrupt. */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001965 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
1966 hwif->INB(IDE_BCOUNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967
1968 ireason.all = hwif->INB(IDE_IREASON_REG);
1969
1970 if (ireason.b.cod) {
1971 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
1972 return ide_do_reset(drive);
1973 }
1974 if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
1975 /* Hopefully, we will never get here */
1976 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1977 ireason.b.io ? "Write":"Read");
1978 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1979 ireason.b.io ? "Read":"Write");
1980 return ide_do_reset(drive);
1981 }
1982 if (!test_bit(PC_WRITING, &pc->flags)) {
1983 /* Reading - Check that we have enough space */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001984 temp = pc->actually_transferred + bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 if (temp > pc->request_transfer) {
1986 if (temp > pc->buffer_size) {
1987 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01001988 idetape_discard_data(drive, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1990 return ide_started;
1991 }
1992#if IDETAPE_DEBUG_LOG
1993 if (tape->debug_level >= 2)
1994 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1995#endif /* IDETAPE_DEBUG_LOG */
1996 }
1997 }
1998 if (test_bit(PC_WRITING, &pc->flags)) {
1999 if (pc->bh != NULL)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002000 idetape_output_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 else
2002 /* Write the current buffer */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002003 hwif->atapi_output_bytes(drive, pc->current_position,
2004 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 } else {
2006 if (pc->bh != NULL)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002007 idetape_input_buffers(drive, pc, bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 else
2009 /* Read the current buffer */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002010 hwif->atapi_input_bytes(drive, pc->current_position,
2011 bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 }
2013 /* Update the current position */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002014 pc->actually_transferred += bcount;
2015 pc->current_position += bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016#if IDETAPE_DEBUG_LOG
2017 if (tape->debug_level >= 2)
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002018 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes "
2019 "on that interrupt\n", pc->c[0], bcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020#endif
2021 /* And set the interrupt handler again */
2022 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2023 return ide_started;
2024}
2025
2026/*
2027 * Packet Command Interface
2028 *
2029 * The current Packet Command is available in tape->pc, and will not
2030 * change until we finish handling it. Each packet command is associated
2031 * with a callback function that will be called when the command is
2032 * finished.
2033 *
2034 * The handling will be done in three stages:
2035 *
2036 * 1. idetape_issue_packet_command will send the packet command to the
2037 * drive, and will set the interrupt handler to idetape_pc_intr.
2038 *
2039 * 2. On each interrupt, idetape_pc_intr will be called. This step
2040 * will be repeated until the device signals us that no more
2041 * interrupts will be issued.
2042 *
2043 * 3. ATAPI Tape media access commands have immediate status with a
2044 * delayed process. In case of a successful initiation of a
2045 * media access packet command, the DSC bit will be set when the
2046 * actual execution of the command is finished.
2047 * Since the tape drive will not issue an interrupt, we have to
2048 * poll for this event. In this case, we define the request as
2049 * "low priority request" by setting rq_status to
2050 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
2051 * the driver.
2052 *
2053 * ide.c will then give higher priority to requests which
2054 * originate from the other device, until will change rq_status
2055 * to RQ_ACTIVE.
2056 *
2057 * 4. When the packet command is finished, it will be checked for errors.
2058 *
2059 * 5. In case an error was found, we queue a request sense packet
2060 * command in front of the request queue and retry the operation
2061 * up to IDETAPE_MAX_PC_RETRIES times.
2062 *
2063 * 6. In case no error was found, or we decided to give up and not
2064 * to retry again, the callback function will be called and then
2065 * we will handle the next request.
2066 *
2067 */
2068static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
2069{
2070 ide_hwif_t *hwif = drive->hwif;
2071 idetape_tape_t *tape = drive->driver_data;
2072 idetape_pc_t *pc = tape->pc;
2073 atapi_ireason_t ireason;
2074 int retries = 100;
2075 ide_startstop_t startstop;
2076
2077 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
2078 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
2079 return startstop;
2080 }
2081 ireason.all = hwif->INB(IDE_IREASON_REG);
2082 while (retries-- && (!ireason.b.cod || ireason.b.io)) {
2083 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
2084 "a packet command, retrying\n");
2085 udelay(100);
2086 ireason.all = hwif->INB(IDE_IREASON_REG);
2087 if (retries == 0) {
2088 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
2089 "issuing a packet command, ignoring\n");
2090 ireason.b.cod = 1;
2091 ireason.b.io = 0;
2092 }
2093 }
2094 if (!ireason.b.cod || ireason.b.io) {
2095 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
2096 "a packet command\n");
2097 return ide_do_reset(drive);
2098 }
2099 /* Set the interrupt routine */
2100 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2101#ifdef CONFIG_BLK_DEV_IDEDMA
2102 /* Begin DMA, if necessary */
2103 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
2104 hwif->dma_start(drive);
2105#endif
2106 /* Send the actual packet */
2107 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
2108 return ide_started;
2109}
2110
2111static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
2112{
2113 ide_hwif_t *hwif = drive->hwif;
2114 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115 int dma_ok = 0;
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002116 u16 bcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117
2118#if IDETAPE_DEBUG_BUGS
2119 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD &&
2120 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2121 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
2122 "Two request sense in serial were issued\n");
2123 }
2124#endif /* IDETAPE_DEBUG_BUGS */
2125
2126 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
2127 tape->failed_pc = pc;
2128 /* Set the current packet command */
2129 tape->pc = pc;
2130
2131 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
2132 test_bit(PC_ABORT, &pc->flags)) {
2133 /*
2134 * We will "abort" retrying a packet command in case
2135 * a legitimate error code was received (crossing a
2136 * filemark, or end of the media, for example).
2137 */
2138 if (!test_bit(PC_ABORT, &pc->flags)) {
2139 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD &&
2140 tape->sense_key == 2 && tape->asc == 4 &&
2141 (tape->ascq == 1 || tape->ascq == 8))) {
2142 printk(KERN_ERR "ide-tape: %s: I/O error, "
2143 "pc = %2x, key = %2x, "
2144 "asc = %2x, ascq = %2x\n",
2145 tape->name, pc->c[0],
2146 tape->sense_key, tape->asc,
2147 tape->ascq);
2148 }
2149 /* Giving up */
2150 pc->error = IDETAPE_ERROR_GENERAL;
2151 }
2152 tape->failed_pc = NULL;
2153 return pc->callback(drive);
2154 }
2155#if IDETAPE_DEBUG_LOG
2156 if (tape->debug_level >= 2)
2157 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
2158#endif /* IDETAPE_DEBUG_LOG */
2159
2160 pc->retries++;
2161 /* We haven't transferred any data yet */
2162 pc->actually_transferred = 0;
2163 pc->current_position = pc->buffer;
2164 /* Request to transfer the entire buffer at once */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002165 bcount = pc->request_transfer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166
2167 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
2168 printk(KERN_WARNING "ide-tape: DMA disabled, "
2169 "reverting to PIO\n");
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +01002170 ide_dma_off(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 }
2172 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
2173 dma_ok = !hwif->dma_setup(drive);
2174
2175 if (IDE_CONTROL_REG)
2176 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
2177 hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */
Bartlomiej Zolnierkiewicz790d1232008-01-25 22:17:12 +01002178 hwif->OUTB((bcount >> 8) & 0xff, IDE_BCOUNTH_REG);
2179 hwif->OUTB(bcount & 0xff, IDE_BCOUNTL_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
2181 if (dma_ok) /* Will begin DMA later */
2182 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
2183 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
2184 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL);
2185 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2186 return ide_started;
2187 } else {
2188 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2189 return idetape_transfer_pc(drive);
2190 }
2191}
2192
2193/*
2194 * General packet command callback function.
2195 */
2196static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
2197{
2198 idetape_tape_t *tape = drive->driver_data;
2199
2200#if IDETAPE_DEBUG_LOG
2201 if (tape->debug_level >= 4)
2202 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
2203#endif /* IDETAPE_DEBUG_LOG */
2204
2205 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
2206 return ide_stopped;
2207}
2208
2209/*
2210 * A mode sense command is used to "sense" tape parameters.
2211 */
2212static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
2213{
2214 idetape_init_pc(pc);
2215 pc->c[0] = IDETAPE_MODE_SENSE_CMD;
2216 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
2217 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
2218 pc->c[2] = page_code;
2219 /*
2220 * Changed pc->c[3] to 0 (255 will at best return unused info).
2221 *
2222 * For SCSI this byte is defined as subpage instead of high byte
2223 * of length and some IDE drives seem to interpret it this way
2224 * and return an error when 255 is used.
2225 */
2226 pc->c[3] = 0;
2227 pc->c[4] = 255; /* (We will just discard data in that case) */
2228 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
2229 pc->request_transfer = 12;
2230 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
2231 pc->request_transfer = 24;
2232 else
2233 pc->request_transfer = 50;
2234 pc->callback = &idetape_pc_callback;
2235}
2236
2237static void calculate_speeds(ide_drive_t *drive)
2238{
2239 idetape_tape_t *tape = drive->driver_data;
2240 int full = 125, empty = 75;
2241
2242 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
2243 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
2244 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
2245 tape->controlled_last_pipeline_head = tape->pipeline_head;
2246 tape->controlled_pipeline_head_time = jiffies;
2247 }
2248 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
2249 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
2250 else if (time_after(jiffies, tape->controlled_previous_head_time))
2251 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
2252
2253 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
2254 /* -1 for read mode error recovery */
2255 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
2256 tape->uncontrolled_pipeline_head_time = jiffies;
2257 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
2258 }
2259 } else {
2260 tape->uncontrolled_previous_head_time = jiffies;
2261 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
2262 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
2263 tape->uncontrolled_pipeline_head_time = jiffies;
2264 }
2265 }
2266 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
2267 if (tape->speed_control == 0) {
2268 tape->max_insert_speed = 5000;
2269 } else if (tape->speed_control == 1) {
2270 if (tape->nr_pending_stages >= tape->max_stages / 2)
2271 tape->max_insert_speed = tape->pipeline_head_speed +
2272 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
2273 else
2274 tape->max_insert_speed = 500 +
2275 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
2276 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
2277 tape->max_insert_speed = 5000;
2278 } else if (tape->speed_control == 2) {
2279 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
2280 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
2281 } else
2282 tape->max_insert_speed = tape->speed_control;
2283 tape->max_insert_speed = max(tape->max_insert_speed, 500);
2284}
2285
2286static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
2287{
2288 idetape_tape_t *tape = drive->driver_data;
2289 idetape_pc_t *pc = tape->pc;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01002290 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01002292 stat = drive->hwif->INB(IDE_STATUS_REG);
2293 if (stat & SEEK_STAT) {
2294 if (stat & ERR_STAT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295 /* Error detected */
2296 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
2297 printk(KERN_ERR "ide-tape: %s: I/O error, ",
2298 tape->name);
2299 /* Retry operation */
2300 return idetape_retry_pc(drive);
2301 }
2302 pc->error = 0;
2303 if (tape->failed_pc == pc)
2304 tape->failed_pc = NULL;
2305 } else {
2306 pc->error = IDETAPE_ERROR_GENERAL;
2307 tape->failed_pc = NULL;
2308 }
2309 return pc->callback(drive);
2310}
2311
2312static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
2313{
2314 idetape_tape_t *tape = drive->driver_data;
2315 struct request *rq = HWGROUP(drive)->rq;
2316 int blocks = tape->pc->actually_transferred / tape->tape_block_size;
2317
2318 tape->avg_size += blocks * tape->tape_block_size;
2319 tape->insert_size += blocks * tape->tape_block_size;
2320 if (tape->insert_size > 1024 * 1024)
2321 tape->measure_insert_time = 1;
2322 if (tape->measure_insert_time) {
2323 tape->measure_insert_time = 0;
2324 tape->insert_time = jiffies;
2325 tape->insert_size = 0;
2326 }
2327 if (time_after(jiffies, tape->insert_time))
2328 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -08002329 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
2331 tape->avg_size = 0;
2332 tape->avg_time = jiffies;
2333 }
2334
2335#if IDETAPE_DEBUG_LOG
2336 if (tape->debug_level >= 4)
2337 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
2338#endif /* IDETAPE_DEBUG_LOG */
2339
2340 tape->first_frame_position += blocks;
2341 rq->current_nr_sectors -= blocks;
2342
2343 if (!tape->pc->error)
2344 idetape_end_request(drive, 1, 0);
2345 else
2346 idetape_end_request(drive, tape->pc->error, 0);
2347 return ide_stopped;
2348}
2349
2350static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2351{
2352 idetape_init_pc(pc);
2353 pc->c[0] = IDETAPE_READ_CMD;
2354 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2355 pc->c[1] = 1;
2356 pc->callback = &idetape_rw_callback;
2357 pc->bh = bh;
2358 atomic_set(&bh->b_count, 0);
2359 pc->buffer = NULL;
2360 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2361 if (pc->request_transfer == tape->stage_size)
2362 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2363}
2364
2365static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2366{
2367 int size = 32768;
2368 struct idetape_bh *p = bh;
2369
2370 idetape_init_pc(pc);
2371 pc->c[0] = IDETAPE_READ_BUFFER_CMD;
2372 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
2373 pc->c[7] = size >> 8;
2374 pc->c[8] = size & 0xff;
2375 pc->callback = &idetape_pc_callback;
2376 pc->bh = bh;
2377 atomic_set(&bh->b_count, 0);
2378 pc->buffer = NULL;
2379 while (p) {
2380 atomic_set(&p->b_count, 0);
2381 p = p->b_reqnext;
2382 }
2383 pc->request_transfer = pc->buffer_size = size;
2384}
2385
2386static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2387{
2388 idetape_init_pc(pc);
2389 pc->c[0] = IDETAPE_WRITE_CMD;
2390 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2391 pc->c[1] = 1;
2392 pc->callback = &idetape_rw_callback;
2393 set_bit(PC_WRITING, &pc->flags);
2394 pc->bh = bh;
2395 pc->b_data = bh->b_data;
2396 pc->b_count = atomic_read(&bh->b_count);
2397 pc->buffer = NULL;
2398 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2399 if (pc->request_transfer == tape->stage_size)
2400 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2401}
2402
2403/*
2404 * idetape_do_request is our request handling function.
2405 */
2406static ide_startstop_t idetape_do_request(ide_drive_t *drive,
2407 struct request *rq, sector_t block)
2408{
2409 idetape_tape_t *tape = drive->driver_data;
2410 idetape_pc_t *pc = NULL;
2411 struct request *postponed_rq = tape->postponed_rq;
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01002412 u8 stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002413
2414#if IDETAPE_DEBUG_LOG
2415#if 0
2416 if (tape->debug_level >= 5)
Jens Axboecdd60262006-07-28 09:32:07 +02002417 printk(KERN_INFO "ide-tape: %d, "
2418 "dev: %s, cmd: %ld, errors: %d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 rq->rq_disk->disk_name, rq->cmd[0], rq->errors);
2420#endif
2421 if (tape->debug_level >= 2)
2422 printk(KERN_INFO "ide-tape: sector: %ld, "
2423 "nr_sectors: %ld, current_nr_sectors: %d\n",
2424 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
2425#endif /* IDETAPE_DEBUG_LOG */
2426
Jens Axboe4aff5e22006-08-10 08:44:47 +02002427 if (!blk_special_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002428 /*
2429 * We do not support buffer cache originated requests.
2430 */
2431 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
Jens Axboe4aff5e22006-08-10 08:44:47 +02002432 "request queue (%d)\n", drive->name, rq->cmd_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 ide_end_request(drive, 0, 0);
2434 return ide_stopped;
2435 }
2436
2437 /*
2438 * Retry a failed packet command
2439 */
2440 if (tape->failed_pc != NULL &&
2441 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2442 return idetape_issue_packet_command(drive, tape->failed_pc);
2443 }
2444#if IDETAPE_DEBUG_BUGS
2445 if (postponed_rq != NULL)
2446 if (rq != postponed_rq) {
2447 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
2448 "Two DSC requests were queued\n");
2449 idetape_end_request(drive, 0, 0);
2450 return ide_stopped;
2451 }
2452#endif /* IDETAPE_DEBUG_BUGS */
2453
2454 tape->postponed_rq = NULL;
2455
2456 /*
2457 * If the tape is still busy, postpone our request and service
2458 * the other device meanwhile.
2459 */
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01002460 stat = drive->hwif->INB(IDE_STATUS_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002461
2462 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
2463 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
2464
2465 if (drive->post_reset == 1) {
2466 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
2467 drive->post_reset = 0;
2468 }
2469
2470 if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
2471 tape->measure_insert_time = 1;
2472 if (time_after(jiffies, tape->insert_time))
2473 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2474 calculate_speeds(drive);
2475 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
Bartlomiej Zolnierkiewicz22c525b2008-01-25 22:17:11 +01002476 (stat & SEEK_STAT) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477 if (postponed_rq == NULL) {
2478 tape->dsc_polling_start = jiffies;
2479 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
2480 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
2481 } else if (time_after(jiffies, tape->dsc_timeout)) {
2482 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
2483 tape->name);
2484 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2485 idetape_media_access_finished(drive);
2486 return ide_stopped;
2487 } else {
2488 return ide_do_reset(drive);
2489 }
Marcelo Feitoza Parisi9bae1ff2006-03-28 01:56:46 -08002490 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002491 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
2492 idetape_postpone_request(drive);
2493 return ide_stopped;
2494 }
2495 if (rq->cmd[0] & REQ_IDETAPE_READ) {
2496 tape->buffer_head++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497 tape->postpone_cnt = 0;
2498 pc = idetape_next_pc_storage(drive);
2499 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2500 goto out;
2501 }
2502 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
2503 tape->buffer_head++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002504 tape->postpone_cnt = 0;
2505 pc = idetape_next_pc_storage(drive);
2506 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2507 goto out;
2508 }
2509 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
2510 tape->postpone_cnt = 0;
2511 pc = idetape_next_pc_storage(drive);
2512 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2513 goto out;
2514 }
2515 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
2516 pc = (idetape_pc_t *) rq->buffer;
2517 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
2518 rq->cmd[0] |= REQ_IDETAPE_PC2;
2519 goto out;
2520 }
2521 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2522 idetape_media_access_finished(drive);
2523 return ide_stopped;
2524 }
2525 BUG();
2526out:
2527 return idetape_issue_packet_command(drive, pc);
2528}
2529
2530/*
2531 * Pipeline related functions
2532 */
2533static inline int idetape_pipeline_active (idetape_tape_t *tape)
2534{
2535 int rc1, rc2;
2536
2537 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2538 rc2 = (tape->active_data_request != NULL);
2539 return rc1;
2540}
2541
2542/*
2543 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
2544 * stage, along with all the necessary small buffers which together make
2545 * a buffer of size tape->stage_size (or a bit more). We attempt to
2546 * combine sequential pages as much as possible.
2547 *
2548 * Returns a pointer to the new allocated stage, or NULL if we
2549 * can't (or don't want to) allocate a stage.
2550 *
2551 * Pipeline stages are optional and are used to increase performance.
2552 * If we can't allocate them, we'll manage without them.
2553 */
2554static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
2555{
2556 idetape_stage_t *stage;
2557 struct idetape_bh *prev_bh, *bh;
2558 int pages = tape->pages_per_stage;
2559 char *b_data = NULL;
2560
Robert P. J. Day5cbded52006-12-13 00:35:56 -08002561 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002562 return NULL;
2563 stage->next = NULL;
2564
Robert P. J. Day5cbded52006-12-13 00:35:56 -08002565 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002566 if (bh == NULL)
2567 goto abort;
2568 bh->b_reqnext = NULL;
2569 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2570 goto abort;
2571 if (clear)
2572 memset(bh->b_data, 0, PAGE_SIZE);
2573 bh->b_size = PAGE_SIZE;
2574 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2575
2576 while (--pages) {
2577 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2578 goto abort;
2579 if (clear)
2580 memset(b_data, 0, PAGE_SIZE);
2581 if (bh->b_data == b_data + PAGE_SIZE) {
2582 bh->b_size += PAGE_SIZE;
2583 bh->b_data -= PAGE_SIZE;
2584 if (full)
2585 atomic_add(PAGE_SIZE, &bh->b_count);
2586 continue;
2587 }
2588 if (b_data == bh->b_data + bh->b_size) {
2589 bh->b_size += PAGE_SIZE;
2590 if (full)
2591 atomic_add(PAGE_SIZE, &bh->b_count);
2592 continue;
2593 }
2594 prev_bh = bh;
Robert P. J. Day5cbded52006-12-13 00:35:56 -08002595 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596 free_page((unsigned long) b_data);
2597 goto abort;
2598 }
2599 bh->b_reqnext = NULL;
2600 bh->b_data = b_data;
2601 bh->b_size = PAGE_SIZE;
2602 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2603 prev_bh->b_reqnext = bh;
2604 }
2605 bh->b_size -= tape->excess_bh_size;
2606 if (full)
2607 atomic_sub(tape->excess_bh_size, &bh->b_count);
2608 return stage;
2609abort:
2610 __idetape_kfree_stage(stage);
2611 return NULL;
2612}
2613
2614static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
2615{
2616 idetape_stage_t *cache_stage = tape->cache_stage;
2617
2618#if IDETAPE_DEBUG_LOG
2619 if (tape->debug_level >= 4)
2620 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
2621#endif /* IDETAPE_DEBUG_LOG */
2622
2623 if (tape->nr_stages >= tape->max_stages)
2624 return NULL;
2625 if (cache_stage != NULL) {
2626 tape->cache_stage = NULL;
2627 return cache_stage;
2628 }
2629 return __idetape_kmalloc_stage(tape, 0, 0);
2630}
2631
Daniel Walkerdcd96372006-06-25 05:47:37 -07002632static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002633{
2634 struct idetape_bh *bh = tape->bh;
2635 int count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07002636 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637
2638 while (n) {
2639#if IDETAPE_DEBUG_BUGS
2640 if (bh == NULL) {
2641 printk(KERN_ERR "ide-tape: bh == NULL in "
2642 "idetape_copy_stage_from_user\n");
Daniel Walkerdcd96372006-06-25 05:47:37 -07002643 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002644 }
2645#endif /* IDETAPE_DEBUG_BUGS */
2646 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
Daniel Walkerdcd96372006-06-25 05:47:37 -07002647 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
2648 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002649 n -= count;
2650 atomic_add(count, &bh->b_count);
2651 buf += count;
2652 if (atomic_read(&bh->b_count) == bh->b_size) {
2653 bh = bh->b_reqnext;
2654 if (bh)
2655 atomic_set(&bh->b_count, 0);
2656 }
2657 }
2658 tape->bh = bh;
Daniel Walkerdcd96372006-06-25 05:47:37 -07002659 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660}
2661
Daniel Walkerdcd96372006-06-25 05:47:37 -07002662static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663{
2664 struct idetape_bh *bh = tape->bh;
2665 int count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07002666 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667
2668 while (n) {
2669#if IDETAPE_DEBUG_BUGS
2670 if (bh == NULL) {
2671 printk(KERN_ERR "ide-tape: bh == NULL in "
2672 "idetape_copy_stage_to_user\n");
Daniel Walkerdcd96372006-06-25 05:47:37 -07002673 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 }
2675#endif /* IDETAPE_DEBUG_BUGS */
2676 count = min(tape->b_count, n);
Daniel Walkerdcd96372006-06-25 05:47:37 -07002677 if (copy_to_user(buf, tape->b_data, count))
2678 ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679 n -= count;
2680 tape->b_data += count;
2681 tape->b_count -= count;
2682 buf += count;
2683 if (!tape->b_count) {
2684 tape->bh = bh = bh->b_reqnext;
2685 if (bh) {
2686 tape->b_data = bh->b_data;
2687 tape->b_count = atomic_read(&bh->b_count);
2688 }
2689 }
2690 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07002691 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692}
2693
2694static void idetape_init_merge_stage (idetape_tape_t *tape)
2695{
2696 struct idetape_bh *bh = tape->merge_stage->bh;
2697
2698 tape->bh = bh;
2699 if (tape->chrdev_direction == idetape_direction_write)
2700 atomic_set(&bh->b_count, 0);
2701 else {
2702 tape->b_data = bh->b_data;
2703 tape->b_count = atomic_read(&bh->b_count);
2704 }
2705}
2706
2707static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
2708{
2709 struct idetape_bh *tmp;
2710
2711 tmp = stage->bh;
2712 stage->bh = tape->merge_stage->bh;
2713 tape->merge_stage->bh = tmp;
2714 idetape_init_merge_stage(tape);
2715}
2716
2717/*
2718 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2719 */
2720static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
2721{
2722 idetape_tape_t *tape = drive->driver_data;
2723 unsigned long flags;
2724
2725#if IDETAPE_DEBUG_LOG
2726 if (tape->debug_level >= 4)
2727 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
2728#endif /* IDETAPE_DEBUG_LOG */
2729 spin_lock_irqsave(&tape->spinlock, flags);
2730 stage->next = NULL;
2731 if (tape->last_stage != NULL)
2732 tape->last_stage->next=stage;
2733 else
2734 tape->first_stage = tape->next_stage=stage;
2735 tape->last_stage = stage;
2736 if (tape->next_stage == NULL)
2737 tape->next_stage = tape->last_stage;
2738 tape->nr_stages++;
2739 tape->nr_pending_stages++;
2740 spin_unlock_irqrestore(&tape->spinlock, flags);
2741}
2742
2743/*
2744 * idetape_wait_for_request installs a completion in a pending request
2745 * and sleeps until it is serviced.
2746 *
2747 * The caller should ensure that the request will not be serviced
2748 * before we install the completion (usually by disabling interrupts).
2749 */
2750static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
2751{
Peter Zijlstra6e9a4732006-09-30 23:28:10 -07002752 DECLARE_COMPLETION_ONSTACK(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753 idetape_tape_t *tape = drive->driver_data;
2754
2755#if IDETAPE_DEBUG_BUGS
Jens Axboe4aff5e22006-08-10 08:44:47 +02002756 if (rq == NULL || !blk_special_request(rq)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002757 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
2758 return;
2759 }
2760#endif /* IDETAPE_DEBUG_BUGS */
Jens Axboec00895a2006-09-30 20:29:12 +02002761 rq->end_io_data = &wait;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762 rq->end_io = blk_end_sync_rq;
2763 spin_unlock_irq(&tape->spinlock);
2764 wait_for_completion(&wait);
2765 /* The stage and its struct request have been deallocated */
2766 spin_lock_irq(&tape->spinlock);
2767}
2768
2769static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
2770{
2771 idetape_tape_t *tape = drive->driver_data;
2772 idetape_read_position_result_t *result;
2773
2774#if IDETAPE_DEBUG_LOG
2775 if (tape->debug_level >= 4)
2776 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
2777#endif /* IDETAPE_DEBUG_LOG */
2778
2779 if (!tape->pc->error) {
2780 result = (idetape_read_position_result_t *) tape->pc->buffer;
2781#if IDETAPE_DEBUG_LOG
2782 if (tape->debug_level >= 2)
2783 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
2784 if (tape->debug_level >= 2)
2785 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
2786#endif /* IDETAPE_DEBUG_LOG */
2787 if (result->bpu) {
2788 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
2789 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2790 idetape_end_request(drive, 0, 0);
2791 } else {
2792#if IDETAPE_DEBUG_LOG
2793 if (tape->debug_level >= 2)
2794 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
2795#endif /* IDETAPE_DEBUG_LOG */
2796 tape->partition = result->partition;
2797 tape->first_frame_position = ntohl(result->first_block);
2798 tape->last_frame_position = ntohl(result->last_block);
2799 tape->blocks_in_buffer = result->blocks_in_buffer[2];
2800 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2801 idetape_end_request(drive, 1, 0);
2802 }
2803 } else {
2804 idetape_end_request(drive, 0, 0);
2805 }
2806 return ide_stopped;
2807}
2808
2809/*
2810 * idetape_create_write_filemark_cmd will:
2811 *
2812 * 1. Write a filemark if write_filemark=1.
2813 * 2. Flush the device buffers without writing a filemark
2814 * if write_filemark=0.
2815 *
2816 */
2817static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2818{
2819 idetape_init_pc(pc);
2820 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
2821 pc->c[4] = write_filemark;
2822 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2823 pc->callback = &idetape_pc_callback;
2824}
2825
2826static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2827{
2828 idetape_init_pc(pc);
2829 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
2830 pc->callback = &idetape_pc_callback;
2831}
2832
2833/*
2834 * idetape_queue_pc_tail is based on the following functions:
2835 *
2836 * ide_do_drive_cmd from ide.c
2837 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2838 *
2839 * We add a special packet command request to the tail of the request
2840 * queue, and wait for it to be serviced.
2841 *
2842 * This is not to be called from within the request handling part
2843 * of the driver ! We allocate here data in the stack, and it is valid
2844 * until the request is finished. This is not the case for the bottom
2845 * part of the driver, where we are always leaving the functions to wait
2846 * for an interrupt or a timer event.
2847 *
2848 * From the bottom part of the driver, we should allocate safe memory
2849 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2850 * the request to the request list without waiting for it to be serviced !
2851 * In that case, we usually use idetape_queue_pc_head.
2852 */
2853static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2854{
2855 struct ide_tape_obj *tape = drive->driver_data;
2856 struct request rq;
2857
2858 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2859 rq.buffer = (char *) pc;
2860 rq.rq_disk = tape->disk;
2861 return ide_do_drive_cmd(drive, &rq, ide_wait);
2862}
2863
2864static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2865{
2866 idetape_init_pc(pc);
2867 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
2868 pc->c[4] = cmd;
2869 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2870 pc->callback = &idetape_pc_callback;
2871}
2872
2873static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2874{
2875 idetape_tape_t *tape = drive->driver_data;
2876 idetape_pc_t pc;
2877 int load_attempted = 0;
2878
2879 /*
2880 * Wait for the tape to become ready
2881 */
2882 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2883 timeout += jiffies;
2884 while (time_before(jiffies, timeout)) {
2885 idetape_create_test_unit_ready_cmd(&pc);
2886 if (!__idetape_queue_pc_tail(drive, &pc))
2887 return 0;
2888 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2889 || (tape->asc == 0x3A)) { /* no media */
2890 if (load_attempted)
2891 return -ENOMEDIUM;
2892 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2893 __idetape_queue_pc_tail(drive, &pc);
2894 load_attempted = 1;
2895 /* not about to be ready */
2896 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2897 (tape->ascq == 1 || tape->ascq == 8)))
2898 return -EIO;
Nishanth Aravamudan80ce45f2005-09-10 00:27:08 -07002899 msleep(100);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 }
2901 return -EIO;
2902}
2903
2904static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2905{
2906 return __idetape_queue_pc_tail(drive, pc);
2907}
2908
2909static int idetape_flush_tape_buffers (ide_drive_t *drive)
2910{
2911 idetape_pc_t pc;
2912 int rc;
2913
2914 idetape_create_write_filemark_cmd(drive, &pc, 0);
2915 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2916 return rc;
2917 idetape_wait_ready(drive, 60 * 5 * HZ);
2918 return 0;
2919}
2920
2921static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2922{
2923 idetape_init_pc(pc);
2924 pc->c[0] = IDETAPE_READ_POSITION_CMD;
2925 pc->request_transfer = 20;
2926 pc->callback = &idetape_read_position_callback;
2927}
2928
2929static int idetape_read_position (ide_drive_t *drive)
2930{
2931 idetape_tape_t *tape = drive->driver_data;
2932 idetape_pc_t pc;
2933 int position;
2934
2935#if IDETAPE_DEBUG_LOG
2936 if (tape->debug_level >= 4)
2937 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
2938#endif /* IDETAPE_DEBUG_LOG */
2939
2940 idetape_create_read_position_cmd(&pc);
2941 if (idetape_queue_pc_tail(drive, &pc))
2942 return -1;
2943 position = tape->first_frame_position;
2944 return position;
2945}
2946
2947static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2948{
2949 idetape_init_pc(pc);
2950 pc->c[0] = IDETAPE_LOCATE_CMD;
2951 pc->c[1] = 2;
2952 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]);
2953 pc->c[8] = partition;
2954 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2955 pc->callback = &idetape_pc_callback;
2956}
2957
2958static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2959{
2960 idetape_tape_t *tape = drive->driver_data;
2961
2962 if (!tape->capabilities.lock)
2963 return 0;
2964
2965 idetape_init_pc(pc);
2966 pc->c[0] = IDETAPE_PREVENT_CMD;
2967 pc->c[4] = prevent;
2968 pc->callback = &idetape_pc_callback;
2969 return 1;
2970}
2971
2972static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2973{
2974 idetape_tape_t *tape = drive->driver_data;
2975 unsigned long flags;
2976 int cnt;
2977
2978 if (tape->chrdev_direction != idetape_direction_read)
2979 return 0;
2980
2981 /* Remove merge stage. */
2982 cnt = tape->merge_stage_size / tape->tape_block_size;
2983 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2984 ++cnt; /* Filemarks count as 1 sector */
2985 tape->merge_stage_size = 0;
2986 if (tape->merge_stage != NULL) {
2987 __idetape_kfree_stage(tape->merge_stage);
2988 tape->merge_stage = NULL;
2989 }
2990
2991 /* Clear pipeline flags. */
2992 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2993 tape->chrdev_direction = idetape_direction_none;
2994
2995 /* Remove pipeline stages. */
2996 if (tape->first_stage == NULL)
2997 return 0;
2998
2999 spin_lock_irqsave(&tape->spinlock, flags);
3000 tape->next_stage = NULL;
3001 if (idetape_pipeline_active(tape))
3002 idetape_wait_for_request(drive, tape->active_data_request);
3003 spin_unlock_irqrestore(&tape->spinlock, flags);
3004
3005 while (tape->first_stage != NULL) {
3006 struct request *rq_ptr = &tape->first_stage->rq;
3007
3008 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
3009 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3010 ++cnt;
3011 idetape_remove_stage_head(drive);
3012 }
3013 tape->nr_pending_stages = 0;
3014 tape->max_stages = tape->min_pipeline;
3015 return cnt;
3016}
3017
3018/*
3019 * idetape_position_tape positions the tape to the requested block
3020 * using the LOCATE packet command. A READ POSITION command is then
3021 * issued to check where we are positioned.
3022 *
3023 * Like all higher level operations, we queue the commands at the tail
3024 * of the request queue and wait for their completion.
3025 *
3026 */
3027static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
3028{
3029 idetape_tape_t *tape = drive->driver_data;
3030 int retval;
3031 idetape_pc_t pc;
3032
3033 if (tape->chrdev_direction == idetape_direction_read)
3034 __idetape_discard_read_pipeline(drive);
3035 idetape_wait_ready(drive, 60 * 5 * HZ);
3036 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
3037 retval = idetape_queue_pc_tail(drive, &pc);
3038 if (retval)
3039 return (retval);
3040
3041 idetape_create_read_position_cmd(&pc);
3042 return (idetape_queue_pc_tail(drive, &pc));
3043}
3044
3045static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
3046{
3047 idetape_tape_t *tape = drive->driver_data;
3048 int cnt;
3049 int seek, position;
3050
3051 cnt = __idetape_discard_read_pipeline(drive);
3052 if (restore_position) {
3053 position = idetape_read_position(drive);
3054 seek = position > cnt ? position - cnt : 0;
3055 if (idetape_position_tape(drive, seek, 0, 0)) {
3056 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
3057 return;
3058 }
3059 }
3060}
3061
3062/*
3063 * idetape_queue_rw_tail generates a read/write request for the block
3064 * device interface and wait for it to be serviced.
3065 */
3066static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
3067{
3068 idetape_tape_t *tape = drive->driver_data;
3069 struct request rq;
3070
3071#if IDETAPE_DEBUG_LOG
3072 if (tape->debug_level >= 2)
3073 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
3074#endif /* IDETAPE_DEBUG_LOG */
3075#if IDETAPE_DEBUG_BUGS
3076 if (idetape_pipeline_active(tape)) {
3077 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
3078 return (0);
3079 }
3080#endif /* IDETAPE_DEBUG_BUGS */
3081
3082 idetape_init_rq(&rq, cmd);
3083 rq.rq_disk = tape->disk;
3084 rq.special = (void *)bh;
3085 rq.sector = tape->first_frame_position;
3086 rq.nr_sectors = rq.current_nr_sectors = blocks;
3087 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
3088
3089 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
3090 return 0;
3091
3092 if (tape->merge_stage)
3093 idetape_init_merge_stage(tape);
3094 if (rq.errors == IDETAPE_ERROR_GENERAL)
3095 return -EIO;
3096 return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
3097}
3098
3099/*
3100 * idetape_insert_pipeline_into_queue is used to start servicing the
3101 * pipeline stages, starting from tape->next_stage.
3102 */
3103static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
3104{
3105 idetape_tape_t *tape = drive->driver_data;
3106
3107 if (tape->next_stage == NULL)
3108 return;
3109 if (!idetape_pipeline_active(tape)) {
3110 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
3111 idetape_active_next_stage(drive);
3112 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
3113 }
3114}
3115
3116static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
3117{
3118 idetape_init_pc(pc);
3119 pc->c[0] = IDETAPE_INQUIRY_CMD;
3120 pc->c[4] = pc->request_transfer = 254;
3121 pc->callback = &idetape_pc_callback;
3122}
3123
3124static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
3125{
3126 idetape_init_pc(pc);
3127 pc->c[0] = IDETAPE_REWIND_CMD;
3128 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3129 pc->callback = &idetape_pc_callback;
3130}
3131
3132#if 0
3133static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length)
3134{
3135 idetape_init_pc(pc);
3136 set_bit(PC_WRITING, &pc->flags);
3137 pc->c[0] = IDETAPE_MODE_SELECT_CMD;
3138 pc->c[1] = 0x10;
3139 put_unaligned(htons(length), (unsigned short *) &pc->c[3]);
3140 pc->request_transfer = 255;
3141 pc->callback = &idetape_pc_callback;
3142}
3143#endif
3144
3145static void idetape_create_erase_cmd (idetape_pc_t *pc)
3146{
3147 idetape_init_pc(pc);
3148 pc->c[0] = IDETAPE_ERASE_CMD;
3149 pc->c[1] = 1;
3150 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3151 pc->callback = &idetape_pc_callback;
3152}
3153
3154static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
3155{
3156 idetape_init_pc(pc);
3157 pc->c[0] = IDETAPE_SPACE_CMD;
3158 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]);
3159 pc->c[1] = cmd;
3160 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3161 pc->callback = &idetape_pc_callback;
3162}
3163
3164static void idetape_wait_first_stage (ide_drive_t *drive)
3165{
3166 idetape_tape_t *tape = drive->driver_data;
3167 unsigned long flags;
3168
3169 if (tape->first_stage == NULL)
3170 return;
3171 spin_lock_irqsave(&tape->spinlock, flags);
3172 if (tape->active_stage == tape->first_stage)
3173 idetape_wait_for_request(drive, tape->active_data_request);
3174 spin_unlock_irqrestore(&tape->spinlock, flags);
3175}
3176
3177/*
3178 * idetape_add_chrdev_write_request tries to add a character device
3179 * originated write request to our pipeline. In case we don't succeed,
3180 * we revert to non-pipelined operation mode for this request.
3181 *
3182 * 1. Try to allocate a new pipeline stage.
3183 * 2. If we can't, wait for more and more requests to be serviced
3184 * and try again each time.
3185 * 3. If we still can't allocate a stage, fallback to
3186 * non-pipelined operation mode for this request.
3187 */
3188static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
3189{
3190 idetape_tape_t *tape = drive->driver_data;
3191 idetape_stage_t *new_stage;
3192 unsigned long flags;
3193 struct request *rq;
3194
3195#if IDETAPE_DEBUG_LOG
3196 if (tape->debug_level >= 3)
3197 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
3198#endif /* IDETAPE_DEBUG_LOG */
3199
3200 /*
3201 * Attempt to allocate a new stage.
3202 * Pay special attention to possible race conditions.
3203 */
3204 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
3205 spin_lock_irqsave(&tape->spinlock, flags);
3206 if (idetape_pipeline_active(tape)) {
3207 idetape_wait_for_request(drive, tape->active_data_request);
3208 spin_unlock_irqrestore(&tape->spinlock, flags);
3209 } else {
3210 spin_unlock_irqrestore(&tape->spinlock, flags);
3211 idetape_insert_pipeline_into_queue(drive);
3212 if (idetape_pipeline_active(tape))
3213 continue;
3214 /*
3215 * Linux is short on memory. Fallback to
3216 * non-pipelined operation mode for this request.
3217 */
3218 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3219 }
3220 }
3221 rq = &new_stage->rq;
3222 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
3223 /* Doesn't actually matter - We always assume sequential access */
3224 rq->sector = tape->first_frame_position;
3225 rq->nr_sectors = rq->current_nr_sectors = blocks;
3226
3227 idetape_switch_buffers(tape, new_stage);
3228 idetape_add_stage_tail(drive, new_stage);
3229 tape->pipeline_head++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003230 calculate_speeds(drive);
3231
3232 /*
3233 * Estimate whether the tape has stopped writing by checking
3234 * if our write pipeline is currently empty. If we are not
3235 * writing anymore, wait for the pipeline to be full enough
3236 * (90%) before starting to service requests, so that we will
3237 * be able to keep up with the higher speeds of the tape.
3238 */
3239 if (!idetape_pipeline_active(tape)) {
3240 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
3241 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
3242 tape->measure_insert_time = 1;
3243 tape->insert_time = jiffies;
3244 tape->insert_size = 0;
3245 tape->insert_speed = 0;
3246 idetape_insert_pipeline_into_queue(drive);
3247 }
3248 }
3249 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3250 /* Return a deferred error */
3251 return -EIO;
3252 return blocks;
3253}
3254
3255/*
3256 * idetape_wait_for_pipeline will wait until all pending pipeline
3257 * requests are serviced. Typically called on device close.
3258 */
3259static void idetape_wait_for_pipeline (ide_drive_t *drive)
3260{
3261 idetape_tape_t *tape = drive->driver_data;
3262 unsigned long flags;
3263
3264 while (tape->next_stage || idetape_pipeline_active(tape)) {
3265 idetape_insert_pipeline_into_queue(drive);
3266 spin_lock_irqsave(&tape->spinlock, flags);
3267 if (idetape_pipeline_active(tape))
3268 idetape_wait_for_request(drive, tape->active_data_request);
3269 spin_unlock_irqrestore(&tape->spinlock, flags);
3270 }
3271}
3272
3273static void idetape_empty_write_pipeline (ide_drive_t *drive)
3274{
3275 idetape_tape_t *tape = drive->driver_data;
3276 int blocks, min;
3277 struct idetape_bh *bh;
3278
3279#if IDETAPE_DEBUG_BUGS
3280 if (tape->chrdev_direction != idetape_direction_write) {
3281 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
3282 return;
3283 }
3284 if (tape->merge_stage_size > tape->stage_size) {
3285 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
3286 tape->merge_stage_size = tape->stage_size;
3287 }
3288#endif /* IDETAPE_DEBUG_BUGS */
3289 if (tape->merge_stage_size) {
3290 blocks = tape->merge_stage_size / tape->tape_block_size;
3291 if (tape->merge_stage_size % tape->tape_block_size) {
3292 unsigned int i;
3293
3294 blocks++;
3295 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
3296 bh = tape->bh->b_reqnext;
3297 while (bh) {
3298 atomic_set(&bh->b_count, 0);
3299 bh = bh->b_reqnext;
3300 }
3301 bh = tape->bh;
3302 while (i) {
3303 if (bh == NULL) {
3304
3305 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
3306 break;
3307 }
3308 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
3309 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
3310 atomic_add(min, &bh->b_count);
3311 i -= min;
3312 bh = bh->b_reqnext;
3313 }
3314 }
3315 (void) idetape_add_chrdev_write_request(drive, blocks);
3316 tape->merge_stage_size = 0;
3317 }
3318 idetape_wait_for_pipeline(drive);
3319 if (tape->merge_stage != NULL) {
3320 __idetape_kfree_stage(tape->merge_stage);
3321 tape->merge_stage = NULL;
3322 }
3323 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3324 tape->chrdev_direction = idetape_direction_none;
3325
3326 /*
3327 * On the next backup, perform the feedback loop again.
3328 * (I don't want to keep sense information between backups,
3329 * as some systems are constantly on, and the system load
3330 * can be totally different on the next backup).
3331 */
3332 tape->max_stages = tape->min_pipeline;
3333#if IDETAPE_DEBUG_BUGS
3334 if (tape->first_stage != NULL ||
3335 tape->next_stage != NULL ||
3336 tape->last_stage != NULL ||
3337 tape->nr_stages != 0) {
3338 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
3339 "first_stage %p, next_stage %p, "
3340 "last_stage %p, nr_stages %d\n",
3341 tape->first_stage, tape->next_stage,
3342 tape->last_stage, tape->nr_stages);
3343 }
3344#endif /* IDETAPE_DEBUG_BUGS */
3345}
3346
3347static void idetape_restart_speed_control (ide_drive_t *drive)
3348{
3349 idetape_tape_t *tape = drive->driver_data;
3350
3351 tape->restart_speed_control_req = 0;
3352 tape->pipeline_head = 0;
3353 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
3354 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
3355 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
3356 tape->uncontrolled_pipeline_head_speed = 0;
3357 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
3358 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
3359}
3360
3361static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
3362{
3363 idetape_tape_t *tape = drive->driver_data;
3364 idetape_stage_t *new_stage;
3365 struct request rq;
3366 int bytes_read;
3367 int blocks = tape->capabilities.ctl;
3368
3369 /* Initialize read operation */
3370 if (tape->chrdev_direction != idetape_direction_read) {
3371 if (tape->chrdev_direction == idetape_direction_write) {
3372 idetape_empty_write_pipeline(drive);
3373 idetape_flush_tape_buffers(drive);
3374 }
3375#if IDETAPE_DEBUG_BUGS
3376 if (tape->merge_stage || tape->merge_stage_size) {
3377 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
3378 tape->merge_stage_size = 0;
3379 }
3380#endif /* IDETAPE_DEBUG_BUGS */
3381 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3382 return -ENOMEM;
3383 tape->chrdev_direction = idetape_direction_read;
3384
3385 /*
3386 * Issue a read 0 command to ensure that DSC handshake
3387 * is switched from completion mode to buffer available
3388 * mode.
3389 * No point in issuing this if DSC overlap isn't supported,
3390 * some drives (Seagate STT3401A) will return an error.
3391 */
3392 if (drive->dsc_overlap) {
3393 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
3394 if (bytes_read < 0) {
3395 __idetape_kfree_stage(tape->merge_stage);
3396 tape->merge_stage = NULL;
3397 tape->chrdev_direction = idetape_direction_none;
3398 return bytes_read;
3399 }
3400 }
3401 }
3402 if (tape->restart_speed_control_req)
3403 idetape_restart_speed_control(drive);
3404 idetape_init_rq(&rq, REQ_IDETAPE_READ);
3405 rq.sector = tape->first_frame_position;
3406 rq.nr_sectors = rq.current_nr_sectors = blocks;
3407 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
3408 tape->nr_stages < max_stages) {
3409 new_stage = idetape_kmalloc_stage(tape);
3410 while (new_stage != NULL) {
3411 new_stage->rq = rq;
3412 idetape_add_stage_tail(drive, new_stage);
3413 if (tape->nr_stages >= max_stages)
3414 break;
3415 new_stage = idetape_kmalloc_stage(tape);
3416 }
3417 }
3418 if (!idetape_pipeline_active(tape)) {
3419 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
3420 tape->measure_insert_time = 1;
3421 tape->insert_time = jiffies;
3422 tape->insert_size = 0;
3423 tape->insert_speed = 0;
3424 idetape_insert_pipeline_into_queue(drive);
3425 }
3426 }
3427 return 0;
3428}
3429
3430/*
3431 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
3432 * to service a character device read request and add read-ahead
3433 * requests to our pipeline.
3434 */
3435static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
3436{
3437 idetape_tape_t *tape = drive->driver_data;
3438 unsigned long flags;
3439 struct request *rq_ptr;
3440 int bytes_read;
3441
3442#if IDETAPE_DEBUG_LOG
3443 if (tape->debug_level >= 4)
3444 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
3445#endif /* IDETAPE_DEBUG_LOG */
3446
3447 /*
3448 * If we are at a filemark, return a read length of 0
3449 */
3450 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
3451 return 0;
3452
3453 /*
3454 * Wait for the next block to be available at the head
3455 * of the pipeline
3456 */
3457 idetape_initiate_read(drive, tape->max_stages);
3458 if (tape->first_stage == NULL) {
3459 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3460 return 0;
3461 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
3462 }
3463 idetape_wait_first_stage(drive);
3464 rq_ptr = &tape->first_stage->rq;
3465 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
3466 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
3467
3468
3469 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
3470 return 0;
3471 else {
3472 idetape_switch_buffers(tape, tape->first_stage);
3473 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3474 set_bit(IDETAPE_FILEMARK, &tape->flags);
3475 spin_lock_irqsave(&tape->spinlock, flags);
3476 idetape_remove_stage_head(drive);
3477 spin_unlock_irqrestore(&tape->spinlock, flags);
3478 tape->pipeline_head++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003479 calculate_speeds(drive);
3480 }
3481#if IDETAPE_DEBUG_BUGS
3482 if (bytes_read > blocks * tape->tape_block_size) {
3483 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
3484 bytes_read = blocks * tape->tape_block_size;
3485 }
3486#endif /* IDETAPE_DEBUG_BUGS */
3487 return (bytes_read);
3488}
3489
3490static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
3491{
3492 idetape_tape_t *tape = drive->driver_data;
3493 struct idetape_bh *bh;
3494 int blocks;
3495
3496 while (bcount) {
3497 unsigned int count;
3498
3499 bh = tape->merge_stage->bh;
3500 count = min(tape->stage_size, bcount);
3501 bcount -= count;
3502 blocks = count / tape->tape_block_size;
3503 while (count) {
3504 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
3505 memset(bh->b_data, 0, atomic_read(&bh->b_count));
3506 count -= atomic_read(&bh->b_count);
3507 bh = bh->b_reqnext;
3508 }
3509 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3510 }
3511}
3512
3513static int idetape_pipeline_size (ide_drive_t *drive)
3514{
3515 idetape_tape_t *tape = drive->driver_data;
3516 idetape_stage_t *stage;
3517 struct request *rq;
3518 int size = 0;
3519
3520 idetape_wait_for_pipeline(drive);
3521 stage = tape->first_stage;
3522 while (stage != NULL) {
3523 rq = &stage->rq;
3524 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
3525 if (rq->errors == IDETAPE_ERROR_FILEMARK)
3526 size += tape->tape_block_size;
3527 stage = stage->next;
3528 }
3529 size += tape->merge_stage_size;
3530 return size;
3531}
3532
3533/*
3534 * Rewinds the tape to the Beginning Of the current Partition (BOP).
3535 *
3536 * We currently support only one partition.
3537 */
3538static int idetape_rewind_tape (ide_drive_t *drive)
3539{
3540 int retval;
3541 idetape_pc_t pc;
3542#if IDETAPE_DEBUG_LOG
3543 idetape_tape_t *tape = drive->driver_data;
3544 if (tape->debug_level >= 2)
3545 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
3546#endif /* IDETAPE_DEBUG_LOG */
3547
3548 idetape_create_rewind_cmd(drive, &pc);
3549 retval = idetape_queue_pc_tail(drive, &pc);
3550 if (retval)
3551 return retval;
3552
3553 idetape_create_read_position_cmd(&pc);
3554 retval = idetape_queue_pc_tail(drive, &pc);
3555 if (retval)
3556 return retval;
3557 return 0;
3558}
3559
3560/*
3561 * Our special ide-tape ioctl's.
3562 *
3563 * Currently there aren't any ioctl's.
3564 * mtio.h compatible commands should be issued to the character device
3565 * interface.
3566 */
3567static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
3568{
3569 idetape_tape_t *tape = drive->driver_data;
3570 idetape_config_t config;
3571 void __user *argp = (void __user *)arg;
3572
3573#if IDETAPE_DEBUG_LOG
3574 if (tape->debug_level >= 4)
3575 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
3576#endif /* IDETAPE_DEBUG_LOG */
3577 switch (cmd) {
3578 case 0x0340:
3579 if (copy_from_user(&config, argp, sizeof (idetape_config_t)))
3580 return -EFAULT;
3581 tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
3582 tape->max_stages = config.nr_stages;
3583 break;
3584 case 0x0350:
3585 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
3586 config.nr_stages = tape->max_stages;
3587 if (copy_to_user(argp, &config, sizeof (idetape_config_t)))
3588 return -EFAULT;
3589 break;
3590 default:
3591 return -EIO;
3592 }
3593 return 0;
3594}
3595
3596/*
3597 * idetape_space_over_filemarks is now a bit more complicated than just
3598 * passing the command to the tape since we may have crossed some
3599 * filemarks during our pipelined read-ahead mode.
3600 *
3601 * As a minor side effect, the pipeline enables us to support MTFSFM when
3602 * the filemark is in our internal pipeline even if the tape doesn't
3603 * support spacing over filemarks in the reverse direction.
3604 */
3605static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
3606{
3607 idetape_tape_t *tape = drive->driver_data;
3608 idetape_pc_t pc;
3609 unsigned long flags;
3610 int retval,count=0;
3611
3612 if (mt_count == 0)
3613 return 0;
3614 if (MTBSF == mt_op || MTBSFM == mt_op) {
3615 if (!tape->capabilities.sprev)
3616 return -EIO;
3617 mt_count = - mt_count;
3618 }
3619
3620 if (tape->chrdev_direction == idetape_direction_read) {
3621 /*
3622 * We have a read-ahead buffer. Scan it for crossed
3623 * filemarks.
3624 */
3625 tape->merge_stage_size = 0;
3626 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
3627 ++count;
3628 while (tape->first_stage != NULL) {
3629 if (count == mt_count) {
3630 if (mt_op == MTFSFM)
3631 set_bit(IDETAPE_FILEMARK, &tape->flags);
3632 return 0;
3633 }
3634 spin_lock_irqsave(&tape->spinlock, flags);
3635 if (tape->first_stage == tape->active_stage) {
3636 /*
3637 * We have reached the active stage in the read pipeline.
3638 * There is no point in allowing the drive to continue
3639 * reading any farther, so we stop the pipeline.
3640 *
3641 * This section should be moved to a separate subroutine,
3642 * because a similar function is performed in
3643 * __idetape_discard_read_pipeline(), for example.
3644 */
3645 tape->next_stage = NULL;
3646 spin_unlock_irqrestore(&tape->spinlock, flags);
3647 idetape_wait_first_stage(drive);
3648 tape->next_stage = tape->first_stage->next;
3649 } else
3650 spin_unlock_irqrestore(&tape->spinlock, flags);
3651 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
3652 ++count;
3653 idetape_remove_stage_head(drive);
3654 }
3655 idetape_discard_read_pipeline(drive, 0);
3656 }
3657
3658 /*
3659 * The filemark was not found in our internal pipeline.
3660 * Now we can issue the space command.
3661 */
3662 switch (mt_op) {
3663 case MTFSF:
3664 case MTBSF:
3665 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
3666 return (idetape_queue_pc_tail(drive, &pc));
3667 case MTFSFM:
3668 case MTBSFM:
3669 if (!tape->capabilities.sprev)
3670 return (-EIO);
3671 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
3672 if (retval) return (retval);
3673 count = (MTBSFM == mt_op ? 1 : -1);
3674 return (idetape_space_over_filemarks(drive, MTFSF, count));
3675 default:
3676 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
3677 return (-EIO);
3678 }
3679}
3680
3681
3682/*
3683 * Our character device read / write functions.
3684 *
3685 * The tape is optimized to maximize throughput when it is transferring
3686 * an integral number of the "continuous transfer limit", which is
3687 * a parameter of the specific tape (26 KB on my particular tape).
3688 * (32 kB for Onstream)
3689 *
3690 * As of version 1.3 of the driver, the character device provides an
3691 * abstract continuous view of the media - any mix of block sizes (even 1
3692 * byte) on the same backup/restore procedure is supported. The driver
3693 * will internally convert the requests to the recommended transfer unit,
3694 * so that an unmatch between the user's block size to the recommended
3695 * size will only result in a (slightly) increased driver overhead, but
3696 * will no longer hit performance.
3697 * This is not applicable to Onstream.
3698 */
3699static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
3700 size_t count, loff_t *ppos)
3701{
3702 struct ide_tape_obj *tape = ide_tape_f(file);
3703 ide_drive_t *drive = tape->drive;
3704 ssize_t bytes_read,temp, actually_read = 0, rc;
Daniel Walkerdcd96372006-06-25 05:47:37 -07003705 ssize_t ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003706
3707#if IDETAPE_DEBUG_LOG
3708 if (tape->debug_level >= 3)
3709 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
3710#endif /* IDETAPE_DEBUG_LOG */
3711
3712 if (tape->chrdev_direction != idetape_direction_read) {
3713 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
3714 if (count > tape->tape_block_size &&
3715 (count % tape->tape_block_size) == 0)
3716 tape->user_bs_factor = count / tape->tape_block_size;
3717 }
3718 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
3719 return rc;
3720 if (count == 0)
3721 return (0);
3722 if (tape->merge_stage_size) {
3723 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
Daniel Walkerdcd96372006-06-25 05:47:37 -07003724 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
3725 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003726 buf += actually_read;
3727 tape->merge_stage_size -= actually_read;
3728 count -= actually_read;
3729 }
3730 while (count >= tape->stage_size) {
3731 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3732 if (bytes_read <= 0)
3733 goto finish;
Daniel Walkerdcd96372006-06-25 05:47:37 -07003734 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
3735 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003736 buf += bytes_read;
3737 count -= bytes_read;
3738 actually_read += bytes_read;
3739 }
3740 if (count) {
3741 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3742 if (bytes_read <= 0)
3743 goto finish;
3744 temp = min((unsigned long)count, (unsigned long)bytes_read);
Daniel Walkerdcd96372006-06-25 05:47:37 -07003745 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
3746 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003747 actually_read += temp;
3748 tape->merge_stage_size = bytes_read-temp;
3749 }
3750finish:
3751 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
3752#if IDETAPE_DEBUG_LOG
3753 if (tape->debug_level >= 2)
3754 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
3755#endif
3756 idetape_space_over_filemarks(drive, MTFSF, 1);
3757 return 0;
3758 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07003759
3760 return (ret) ? ret : actually_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003761}
3762
3763static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
3764 size_t count, loff_t *ppos)
3765{
3766 struct ide_tape_obj *tape = ide_tape_f(file);
3767 ide_drive_t *drive = tape->drive;
Daniel Walkerdcd96372006-06-25 05:47:37 -07003768 ssize_t actually_written = 0;
3769 ssize_t ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003770
3771 /* The drive is write protected. */
3772 if (tape->write_prot)
3773 return -EACCES;
3774
3775#if IDETAPE_DEBUG_LOG
3776 if (tape->debug_level >= 3)
3777 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
3778 "count %Zd\n", count);
3779#endif /* IDETAPE_DEBUG_LOG */
3780
3781 /* Initialize write operation */
3782 if (tape->chrdev_direction != idetape_direction_write) {
3783 if (tape->chrdev_direction == idetape_direction_read)
3784 idetape_discard_read_pipeline(drive, 1);
3785#if IDETAPE_DEBUG_BUGS
3786 if (tape->merge_stage || tape->merge_stage_size) {
3787 printk(KERN_ERR "ide-tape: merge_stage_size "
3788 "should be 0 now\n");
3789 tape->merge_stage_size = 0;
3790 }
3791#endif /* IDETAPE_DEBUG_BUGS */
3792 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3793 return -ENOMEM;
3794 tape->chrdev_direction = idetape_direction_write;
3795 idetape_init_merge_stage(tape);
3796
3797 /*
3798 * Issue a write 0 command to ensure that DSC handshake
3799 * is switched from completion mode to buffer available
3800 * mode.
3801 * No point in issuing this if DSC overlap isn't supported,
3802 * some drives (Seagate STT3401A) will return an error.
3803 */
3804 if (drive->dsc_overlap) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07003805 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003806 if (retval < 0) {
3807 __idetape_kfree_stage(tape->merge_stage);
3808 tape->merge_stage = NULL;
3809 tape->chrdev_direction = idetape_direction_none;
3810 return retval;
3811 }
3812 }
3813 }
3814 if (count == 0)
3815 return (0);
3816 if (tape->restart_speed_control_req)
3817 idetape_restart_speed_control(drive);
3818 if (tape->merge_stage_size) {
3819#if IDETAPE_DEBUG_BUGS
3820 if (tape->merge_stage_size >= tape->stage_size) {
3821 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
3822 tape->merge_stage_size = 0;
3823 }
3824#endif /* IDETAPE_DEBUG_BUGS */
3825 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
Daniel Walkerdcd96372006-06-25 05:47:37 -07003826 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
3827 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003828 buf += actually_written;
3829 tape->merge_stage_size += actually_written;
3830 count -= actually_written;
3831
3832 if (tape->merge_stage_size == tape->stage_size) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07003833 ssize_t retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003834 tape->merge_stage_size = 0;
3835 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3836 if (retval <= 0)
3837 return (retval);
3838 }
3839 }
3840 while (count >= tape->stage_size) {
Daniel Walkerdcd96372006-06-25 05:47:37 -07003841 ssize_t retval;
3842 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
3843 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003844 buf += tape->stage_size;
3845 count -= tape->stage_size;
3846 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3847 actually_written += tape->stage_size;
3848 if (retval <= 0)
3849 return (retval);
3850 }
3851 if (count) {
3852 actually_written += count;
Daniel Walkerdcd96372006-06-25 05:47:37 -07003853 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
3854 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003855 tape->merge_stage_size += count;
3856 }
Daniel Walkerdcd96372006-06-25 05:47:37 -07003857 return (ret) ? ret : actually_written;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003858}
3859
3860static int idetape_write_filemark (ide_drive_t *drive)
3861{
3862 idetape_pc_t pc;
3863
3864 /* Write a filemark */
3865 idetape_create_write_filemark_cmd(drive, &pc, 1);
3866 if (idetape_queue_pc_tail(drive, &pc)) {
3867 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3868 return -EIO;
3869 }
3870 return 0;
3871}
3872
3873/*
3874 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3875 * the general mtio MTIOCTOP ioctl is requested.
3876 *
3877 * We currently support the following mtio.h operations:
3878 *
3879 * MTFSF - Space over mt_count filemarks in the positive direction.
3880 * The tape is positioned after the last spaced filemark.
3881 *
3882 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3883 * last filemark.
3884 *
3885 * MTBSF - Steps background over mt_count filemarks, tape is
3886 * positioned before the last filemark.
3887 *
3888 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3889 *
3890 * Note:
3891 *
3892 * MTBSF and MTBSFM are not supported when the tape doesn't
3893 * support spacing over filemarks in the reverse direction.
3894 * In this case, MTFSFM is also usually not supported (it is
3895 * supported in the rare case in which we crossed the filemark
3896 * during our read-ahead pipelined operation mode).
3897 *
3898 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3899 * the last written filemark.
3900 *
3901 * MTREW - Rewinds tape.
3902 *
3903 * MTLOAD - Loads the tape.
3904 *
3905 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3906 * MTUNLOAD prevents further access until the media is replaced.
3907 *
3908 * MTNOP - Flushes tape buffers.
3909 *
3910 * MTRETEN - Retension media. This typically consists of one end
3911 * to end pass on the media.
3912 *
3913 * MTEOM - Moves to the end of recorded data.
3914 *
3915 * MTERASE - Erases tape.
3916 *
3917 * MTSETBLK - Sets the user block size to mt_count bytes. If
3918 * mt_count is 0, we will attempt to autodetect
3919 * the block size.
3920 *
3921 * MTSEEK - Positions the tape in a specific block number, where
3922 * each block is assumed to contain which user_block_size
3923 * bytes.
3924 *
3925 * MTSETPART - Switches to another tape partition.
3926 *
3927 * MTLOCK - Locks the tape door.
3928 *
3929 * MTUNLOCK - Unlocks the tape door.
3930 *
3931 * The following commands are currently not supported:
3932 *
3933 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3934 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3935 */
3936static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
3937{
3938 idetape_tape_t *tape = drive->driver_data;
3939 idetape_pc_t pc;
3940 int i,retval;
3941
3942#if IDETAPE_DEBUG_LOG
3943 if (tape->debug_level >= 1)
3944 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
3945 "mt_op=%d, mt_count=%d\n", mt_op, mt_count);
3946#endif /* IDETAPE_DEBUG_LOG */
3947 /*
3948 * Commands which need our pipelined read-ahead stages.
3949 */
3950 switch (mt_op) {
3951 case MTFSF:
3952 case MTFSFM:
3953 case MTBSF:
3954 case MTBSFM:
3955 if (!mt_count)
3956 return (0);
3957 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
3958 default:
3959 break;
3960 }
3961 switch (mt_op) {
3962 case MTWEOF:
3963 if (tape->write_prot)
3964 return -EACCES;
3965 idetape_discard_read_pipeline(drive, 1);
3966 for (i = 0; i < mt_count; i++) {
3967 retval = idetape_write_filemark(drive);
3968 if (retval)
3969 return retval;
3970 }
3971 return (0);
3972 case MTREW:
3973 idetape_discard_read_pipeline(drive, 0);
3974 if (idetape_rewind_tape(drive))
3975 return -EIO;
3976 return 0;
3977 case MTLOAD:
3978 idetape_discard_read_pipeline(drive, 0);
3979 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
3980 return (idetape_queue_pc_tail(drive, &pc));
3981 case MTUNLOAD:
3982 case MTOFFL:
3983 /*
3984 * If door is locked, attempt to unlock before
3985 * attempting to eject.
3986 */
3987 if (tape->door_locked) {
3988 if (idetape_create_prevent_cmd(drive, &pc, 0))
3989 if (!idetape_queue_pc_tail(drive, &pc))
3990 tape->door_locked = DOOR_UNLOCKED;
3991 }
3992 idetape_discard_read_pipeline(drive, 0);
3993 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
3994 retval = idetape_queue_pc_tail(drive, &pc);
3995 if (!retval)
3996 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
3997 return retval;
3998 case MTNOP:
3999 idetape_discard_read_pipeline(drive, 0);
4000 return (idetape_flush_tape_buffers(drive));
4001 case MTRETEN:
4002 idetape_discard_read_pipeline(drive, 0);
4003 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
4004 return (idetape_queue_pc_tail(drive, &pc));
4005 case MTEOM:
4006 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
4007 return (idetape_queue_pc_tail(drive, &pc));
4008 case MTERASE:
4009 (void) idetape_rewind_tape(drive);
4010 idetape_create_erase_cmd(&pc);
4011 return (idetape_queue_pc_tail(drive, &pc));
4012 case MTSETBLK:
4013 if (mt_count) {
4014 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
4015 return -EIO;
4016 tape->user_bs_factor = mt_count / tape->tape_block_size;
4017 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
4018 } else
4019 set_bit(IDETAPE_DETECT_BS, &tape->flags);
4020 return 0;
4021 case MTSEEK:
4022 idetape_discard_read_pipeline(drive, 0);
4023 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
4024 case MTSETPART:
4025 idetape_discard_read_pipeline(drive, 0);
4026 return (idetape_position_tape(drive, 0, mt_count, 0));
4027 case MTFSR:
4028 case MTBSR:
4029 case MTLOCK:
4030 if (!idetape_create_prevent_cmd(drive, &pc, 1))
4031 return 0;
4032 retval = idetape_queue_pc_tail(drive, &pc);
4033 if (retval) return retval;
4034 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
4035 return 0;
4036 case MTUNLOCK:
4037 if (!idetape_create_prevent_cmd(drive, &pc, 0))
4038 return 0;
4039 retval = idetape_queue_pc_tail(drive, &pc);
4040 if (retval) return retval;
4041 tape->door_locked = DOOR_UNLOCKED;
4042 return 0;
4043 default:
4044 printk(KERN_ERR "ide-tape: MTIO operation %d not "
4045 "supported\n", mt_op);
4046 return (-EIO);
4047 }
4048}
4049
4050/*
4051 * Our character device ioctls.
4052 *
4053 * General mtio.h magnetic io commands are supported here, and not in
4054 * the corresponding block interface.
4055 *
4056 * The following ioctls are supported:
4057 *
4058 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
4059 *
4060 * MTIOCGET - The mt_dsreg field in the returned mtget structure
4061 * will be set to (user block size in bytes <<
4062 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
4063 *
4064 * The mt_blkno is set to the current user block number.
4065 * The other mtget fields are not supported.
4066 *
4067 * MTIOCPOS - The current tape "block position" is returned. We
4068 * assume that each block contains user_block_size
4069 * bytes.
4070 *
4071 * Our own ide-tape ioctls are supported on both interfaces.
4072 */
4073static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
4074{
4075 struct ide_tape_obj *tape = ide_tape_f(file);
4076 ide_drive_t *drive = tape->drive;
4077 struct mtop mtop;
4078 struct mtget mtget;
4079 struct mtpos mtpos;
4080 int block_offset = 0, position = tape->first_frame_position;
4081 void __user *argp = (void __user *)arg;
4082
4083#if IDETAPE_DEBUG_LOG
4084 if (tape->debug_level >= 3)
4085 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
4086 "cmd=%u\n", cmd);
4087#endif /* IDETAPE_DEBUG_LOG */
4088
4089 tape->restart_speed_control_req = 1;
4090 if (tape->chrdev_direction == idetape_direction_write) {
4091 idetape_empty_write_pipeline(drive);
4092 idetape_flush_tape_buffers(drive);
4093 }
4094 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
4095 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
4096 if ((position = idetape_read_position(drive)) < 0)
4097 return -EIO;
4098 }
4099 switch (cmd) {
4100 case MTIOCTOP:
4101 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
4102 return -EFAULT;
4103 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
4104 case MTIOCGET:
4105 memset(&mtget, 0, sizeof (struct mtget));
4106 mtget.mt_type = MT_ISSCSI2;
4107 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
4108 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
4109 if (tape->drv_write_prot) {
4110 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
4111 }
4112 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
4113 return -EFAULT;
4114 return 0;
4115 case MTIOCPOS:
4116 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
4117 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
4118 return -EFAULT;
4119 return 0;
4120 default:
4121 if (tape->chrdev_direction == idetape_direction_read)
4122 idetape_discard_read_pipeline(drive, 1);
4123 return idetape_blkdev_ioctl(drive, cmd, arg);
4124 }
4125}
4126
4127static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
4128
4129/*
4130 * Our character device open function.
4131 */
4132static int idetape_chrdev_open (struct inode *inode, struct file *filp)
4133{
4134 unsigned int minor = iminor(inode), i = minor & ~0xc0;
4135 ide_drive_t *drive;
4136 idetape_tape_t *tape;
4137 idetape_pc_t pc;
4138 int retval;
4139
4140 /*
4141 * We really want to do nonseekable_open(inode, filp); here, but some
4142 * versions of tar incorrectly call lseek on tapes and bail out if that
4143 * fails. So we disallow pread() and pwrite(), but permit lseeks.
4144 */
4145 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
4146
4147#if IDETAPE_DEBUG_LOG
4148 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
4149#endif /* IDETAPE_DEBUG_LOG */
4150
4151 if (i >= MAX_HWIFS * MAX_DRIVES)
4152 return -ENXIO;
4153
4154 if (!(tape = ide_tape_chrdev_get(i)))
4155 return -ENXIO;
4156
4157 drive = tape->drive;
4158
4159 filp->private_data = tape;
4160
4161 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
4162 retval = -EBUSY;
4163 goto out_put_tape;
4164 }
4165
4166 retval = idetape_wait_ready(drive, 60 * HZ);
4167 if (retval) {
4168 clear_bit(IDETAPE_BUSY, &tape->flags);
4169 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
4170 goto out_put_tape;
4171 }
4172
4173 idetape_read_position(drive);
4174 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
4175 (void)idetape_rewind_tape(drive);
4176
4177 if (tape->chrdev_direction != idetape_direction_read)
4178 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
4179
4180 /* Read block size and write protect status from drive. */
4181 idetape_get_blocksize_from_block_descriptor(drive);
4182
4183 /* Set write protect flag if device is opened as read-only. */
4184 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
4185 tape->write_prot = 1;
4186 else
4187 tape->write_prot = tape->drv_write_prot;
4188
4189 /* Make sure drive isn't write protected if user wants to write. */
4190 if (tape->write_prot) {
4191 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
4192 (filp->f_flags & O_ACCMODE) == O_RDWR) {
4193 clear_bit(IDETAPE_BUSY, &tape->flags);
4194 retval = -EROFS;
4195 goto out_put_tape;
4196 }
4197 }
4198
4199 /*
4200 * Lock the tape drive door so user can't eject.
4201 */
4202 if (tape->chrdev_direction == idetape_direction_none) {
4203 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
4204 if (!idetape_queue_pc_tail(drive, &pc)) {
4205 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
4206 tape->door_locked = DOOR_LOCKED;
4207 }
4208 }
4209 }
4210 idetape_restart_speed_control(drive);
4211 tape->restart_speed_control_req = 0;
4212 return 0;
4213
4214out_put_tape:
4215 ide_tape_put(tape);
4216 return retval;
4217}
4218
4219static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
4220{
4221 idetape_tape_t *tape = drive->driver_data;
4222
4223 idetape_empty_write_pipeline(drive);
4224 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
4225 if (tape->merge_stage != NULL) {
4226 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
4227 __idetape_kfree_stage(tape->merge_stage);
4228 tape->merge_stage = NULL;
4229 }
4230 idetape_write_filemark(drive);
4231 idetape_flush_tape_buffers(drive);
4232 idetape_flush_tape_buffers(drive);
4233}
4234
4235/*
4236 * Our character device release function.
4237 */
4238static int idetape_chrdev_release (struct inode *inode, struct file *filp)
4239{
4240 struct ide_tape_obj *tape = ide_tape_f(filp);
4241 ide_drive_t *drive = tape->drive;
4242 idetape_pc_t pc;
4243 unsigned int minor = iminor(inode);
4244
4245 lock_kernel();
4246 tape = drive->driver_data;
4247#if IDETAPE_DEBUG_LOG
4248 if (tape->debug_level >= 3)
4249 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
4250#endif /* IDETAPE_DEBUG_LOG */
4251
4252 if (tape->chrdev_direction == idetape_direction_write)
4253 idetape_write_release(drive, minor);
4254 if (tape->chrdev_direction == idetape_direction_read) {
4255 if (minor < 128)
4256 idetape_discard_read_pipeline(drive, 1);
4257 else
4258 idetape_wait_for_pipeline(drive);
4259 }
4260 if (tape->cache_stage != NULL) {
4261 __idetape_kfree_stage(tape->cache_stage);
4262 tape->cache_stage = NULL;
4263 }
4264 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
4265 (void) idetape_rewind_tape(drive);
4266 if (tape->chrdev_direction == idetape_direction_none) {
4267 if (tape->door_locked == DOOR_LOCKED) {
4268 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
4269 if (!idetape_queue_pc_tail(drive, &pc))
4270 tape->door_locked = DOOR_UNLOCKED;
4271 }
4272 }
4273 }
4274 clear_bit(IDETAPE_BUSY, &tape->flags);
4275 ide_tape_put(tape);
4276 unlock_kernel();
4277 return 0;
4278}
4279
4280/*
4281 * idetape_identify_device is called to check the contents of the
4282 * ATAPI IDENTIFY command results. We return:
4283 *
4284 * 1 If the tape can be supported by us, based on the information
4285 * we have so far.
4286 *
4287 * 0 If this tape driver is not currently supported by us.
4288 */
4289static int idetape_identify_device (ide_drive_t *drive)
4290{
4291 struct idetape_id_gcw gcw;
4292 struct hd_driveid *id = drive->id;
4293#if IDETAPE_DEBUG_INFO
4294 unsigned short mask,i;
4295#endif /* IDETAPE_DEBUG_INFO */
4296
4297 if (drive->id_read == 0)
4298 return 1;
4299
4300 *((unsigned short *) &gcw) = id->config;
4301
4302#if IDETAPE_DEBUG_INFO
4303 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n");
4304 printk(KERN_INFO "ide-tape: Protocol Type: ");
4305 switch (gcw.protocol) {
4306 case 0: case 1: printk("ATA\n");break;
4307 case 2: printk("ATAPI\n");break;
4308 case 3: printk("Reserved (Unknown to ide-tape)\n");break;
4309 }
4310 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type);
4311 switch (gcw.device_type) {
4312 case 0: printk("Direct-access Device\n");break;
4313 case 1: printk("Streaming Tape Device\n");break;
4314 case 2: case 3: case 4: printk("Reserved\n");break;
4315 case 5: printk("CD-ROM Device\n");break;
4316 case 6: printk("Reserved\n");
4317 case 7: printk("Optical memory Device\n");break;
4318 case 0x1f: printk("Unknown or no Device type\n");break;
4319 default: printk("Reserved\n");
4320 }
4321 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n");
4322 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: ");
4323 switch (gcw.drq_type) {
4324 case 0: printk("Microprocessor DRQ\n");break;
4325 case 1: printk("Interrupt DRQ\n");break;
4326 case 2: printk("Accelerated DRQ\n");break;
4327 case 3: printk("Reserved\n");break;
4328 }
4329 printk(KERN_INFO "ide-tape: Command Packet Size: ");
4330 switch (gcw.packet_size) {
4331 case 0: printk("12 bytes\n");break;
4332 case 1: printk("16 bytes\n");break;
4333 default: printk("Reserved\n");break;
4334 }
4335 printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model);
4336 printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev);
4337 printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no);
4338 printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512);
4339 printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
4340 printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
4341 printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
4342 printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
4343 printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
4344 printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO);
4345 printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA);
4346 printk(KERN_INFO "ide-tape: Single Word DMA supported modes: ");
4347 for (i=0,mask=1;i<8;i++,mask=mask << 1) {
4348 if (id->dma_1word & mask)
4349 printk("%d ",i);
4350 if (id->dma_1word & (mask << 8))
4351 printk("(active) ");
4352 }
4353 printk("\n");
4354 printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: ");
4355 for (i=0,mask=1;i<8;i++,mask=mask << 1) {
4356 if (id->dma_mword & mask)
4357 printk("%d ",i);
4358 if (id->dma_mword & (mask << 8))
4359 printk("(active) ");
4360 }
4361 printk("\n");
4362 if (id->field_valid & 0x0002) {
4363 printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",
4364 id->eide_pio_modes & 1 ? "Mode 3":"None");
4365 printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: ");
4366 if (id->eide_dma_min == 0)
4367 printk("Not supported\n");
4368 else
4369 printk("%d ns\n",id->eide_dma_min);
4370
4371 printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: ");
4372 if (id->eide_dma_time == 0)
4373 printk("Not supported\n");
4374 else
4375 printk("%d ns\n",id->eide_dma_time);
4376
4377 printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: ");
4378 if (id->eide_pio == 0)
4379 printk("Not supported\n");
4380 else
4381 printk("%d ns\n",id->eide_pio);
4382
4383 printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: ");
4384 if (id->eide_pio_iordy == 0)
4385 printk("Not supported\n");
4386 else
4387 printk("%d ns\n",id->eide_pio_iordy);
4388
4389 } else
4390 printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n");
4391#endif /* IDETAPE_DEBUG_INFO */
4392
4393 /* Check that we can support this device */
4394
4395 if (gcw.protocol !=2 )
4396 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n");
4397 else if (gcw.device_type != 1)
4398 printk(KERN_ERR "ide-tape: Device type is not set to tape\n");
4399 else if (!gcw.removable)
4400 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
4401 else if (gcw.packet_size != 0) {
4402 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
4403 if (gcw.packet_size == 1)
4404 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
4405 } else
4406 return 1;
4407 return 0;
4408}
4409
4410/*
4411 * Use INQUIRY to get the firmware revision
4412 */
4413static void idetape_get_inquiry_results (ide_drive_t *drive)
4414{
4415 char *r;
4416 idetape_tape_t *tape = drive->driver_data;
4417 idetape_pc_t pc;
4418 idetape_inquiry_result_t *inquiry;
4419
4420 idetape_create_inquiry_cmd(&pc);
4421 if (idetape_queue_pc_tail(drive, &pc)) {
4422 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
4423 return;
4424 }
4425 inquiry = (idetape_inquiry_result_t *) pc.buffer;
4426 memcpy(tape->vendor_id, inquiry->vendor_id, 8);
4427 memcpy(tape->product_id, inquiry->product_id, 16);
4428 memcpy(tape->firmware_revision, inquiry->revision_level, 4);
4429 ide_fixstring(tape->vendor_id, 10, 0);
4430 ide_fixstring(tape->product_id, 18, 0);
4431 ide_fixstring(tape->firmware_revision, 6, 0);
4432 r = tape->firmware_revision;
4433 if (*(r + 1) == '.')
4434 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
4435 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);
4436}
4437
4438/*
4439 * idetape_get_mode_sense_results asks the tape about its various
4440 * parameters. In particular, we will adjust our data transfer buffer
4441 * size to the recommended value as returned by the tape.
4442 */
4443static void idetape_get_mode_sense_results (ide_drive_t *drive)
4444{
4445 idetape_tape_t *tape = drive->driver_data;
4446 idetape_pc_t pc;
4447 idetape_mode_parameter_header_t *header;
4448 idetape_capabilities_page_t *capabilities;
4449
4450 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
4451 if (idetape_queue_pc_tail(drive, &pc)) {
4452 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
4453 tape->tape_block_size = 512;
4454 tape->capabilities.ctl = 52;
4455 tape->capabilities.speed = 450;
4456 tape->capabilities.buffer_size = 6 * 52;
4457 return;
4458 }
4459 header = (idetape_mode_parameter_header_t *) pc.buffer;
4460 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
4461
4462 capabilities->max_speed = ntohs(capabilities->max_speed);
4463 capabilities->ctl = ntohs(capabilities->ctl);
4464 capabilities->speed = ntohs(capabilities->speed);
4465 capabilities->buffer_size = ntohs(capabilities->buffer_size);
4466
4467 if (!capabilities->speed) {
4468 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
4469 capabilities->speed = 650;
4470 }
4471 if (!capabilities->max_speed) {
4472 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
4473 capabilities->max_speed = 650;
4474 }
4475
4476 tape->capabilities = *capabilities; /* Save us a copy */
4477 if (capabilities->blk512)
4478 tape->tape_block_size = 512;
4479 else if (capabilities->blk1024)
4480 tape->tape_block_size = 1024;
4481
4482#if IDETAPE_DEBUG_INFO
4483 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n");
4484 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n");
4485 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length);
4486 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type);
4487 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp);
4488 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl);
4489
4490 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n");
4491 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code);
4492 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length);
4493 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No");
4494 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
4495 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
4496 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
4497 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
4498 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
4499 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
4500 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
4501 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
4502 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
4503 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
4504 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
4505 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No");
4506 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed);
4507 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl);
4508 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed);
4509 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512);
4510#endif /* IDETAPE_DEBUG_INFO */
4511}
4512
4513/*
4514 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
4515 * and if it succeeds sets the tape block size with the reported value
4516 */
4517static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive)
4518{
4519
4520 idetape_tape_t *tape = drive->driver_data;
4521 idetape_pc_t pc;
4522 idetape_mode_parameter_header_t *header;
4523 idetape_parameter_block_descriptor_t *block_descrp;
4524
4525 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
4526 if (idetape_queue_pc_tail(drive, &pc)) {
4527 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
4528 if (tape->tape_block_size == 0) {
4529 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n");
4530 tape->tape_block_size = 32768;
4531 }
4532 return;
4533 }
4534 header = (idetape_mode_parameter_header_t *) pc.buffer;
4535 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t));
4536 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
4537 tape->drv_write_prot = (header->dsp & 0x80) >> 7;
4538
4539#if IDETAPE_DEBUG_INFO
4540 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size);
4541#endif /* IDETAPE_DEBUG_INFO */
4542}
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02004543
4544#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07004545static void idetape_add_settings (ide_drive_t *drive)
4546{
4547 idetape_tape_t *tape = drive->driver_data;
4548
4549/*
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +02004550 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
Linus Torvalds1da177e2005-04-16 15:20:36 -07004551 */
Bartlomiej Zolnierkiewicz14979432007-05-10 00:01:10 +02004552 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
4553 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
4554 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
4555 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
4556 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
4557 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
4558 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL);
4559 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
4560 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);
4561 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
4562 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
4563 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
4564 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
4565 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004566}
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02004567#else
4568static inline void idetape_add_settings(ide_drive_t *drive) { ; }
4569#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07004570
4571/*
4572 * ide_setup is called to:
4573 *
4574 * 1. Initialize our various state variables.
4575 * 2. Ask the tape for its capabilities.
4576 * 3. Allocate a buffer which will be used for data
4577 * transfer. The buffer size is chosen based on
4578 * the recommendation which we received in step (2).
4579 *
4580 * Note that at this point ide.c already assigned us an irq, so that
4581 * we can queue requests here and wait for their completion.
4582 */
4583static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
4584{
4585 unsigned long t1, tmid, tn, t;
4586 int speed;
4587 struct idetape_id_gcw gcw;
4588 int stage_size;
4589 struct sysinfo si;
4590
4591 spin_lock_init(&tape->spinlock);
4592 drive->dsc_overlap = 1;
4593#ifdef CONFIG_BLK_DEV_IDEPCI
4594 if (HWIF(drive)->pci_dev != NULL) {
4595 /*
4596 * These two ide-pci host adapters appear to need DSC overlap disabled.
4597 * This probably needs further analysis.
4598 */
4599 if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) ||
4600 (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) {
4601 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name);
4602 drive->dsc_overlap = 0;
4603 }
4604 }
4605#endif /* CONFIG_BLK_DEV_IDEPCI */
4606 /* Seagate Travan drives do not support DSC overlap. */
4607 if (strstr(drive->id->model, "Seagate STT3401"))
4608 drive->dsc_overlap = 0;
4609 tape->minor = minor;
4610 tape->name[0] = 'h';
4611 tape->name[1] = 't';
4612 tape->name[2] = '0' + minor;
4613 tape->chrdev_direction = idetape_direction_none;
4614 tape->pc = tape->pc_stack;
4615 tape->max_insert_speed = 10000;
4616 tape->speed_control = 1;
4617 *((unsigned short *) &gcw) = drive->id->config;
4618 if (gcw.drq_type == 1)
4619 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
4620
4621 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
4622
4623 idetape_get_inquiry_results(drive);
4624 idetape_get_mode_sense_results(drive);
4625 idetape_get_blocksize_from_block_descriptor(drive);
4626 tape->user_bs_factor = 1;
4627 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4628 while (tape->stage_size > 0xffff) {
4629 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
4630 tape->capabilities.ctl /= 2;
4631 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4632 }
4633 stage_size = tape->stage_size;
4634 tape->pages_per_stage = stage_size / PAGE_SIZE;
4635 if (stage_size % PAGE_SIZE) {
4636 tape->pages_per_stage++;
4637 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
4638 }
4639
4640 /*
4641 * Select the "best" DSC read/write polling frequency
4642 * and pipeline size.
4643 */
4644 speed = max(tape->capabilities.speed, tape->capabilities.max_speed);
4645
4646 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
4647
4648 /*
4649 * Limit memory use for pipeline to 10% of physical memory
4650 */
4651 si_meminfo(&si);
4652 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
4653 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
4654 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
4655 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
4656 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
4657 if (tape->max_stages == 0)
4658 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
4659
4660 t1 = (tape->stage_size * HZ) / (speed * 1000);
4661 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
4662 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
4663
4664 if (tape->max_stages)
4665 t = tn;
4666 else
4667 t = t1;
4668
4669 /*
4670 * Ensure that the number we got makes sense; limit
4671 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
4672 */
4673 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
4674 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
4675 "%dkB pipeline, %lums tDSC%s\n",
4676 drive->name, tape->name, tape->capabilities.speed,
4677 (tape->capabilities.buffer_size * 512) / tape->stage_size,
4678 tape->stage_size / 1024,
4679 tape->max_stages * tape->stage_size / 1024,
4680 tape->best_dsc_rw_frequency * 1000 / HZ,
4681 drive->using_dma ? ", DMA":"");
4682
4683 idetape_add_settings(drive);
4684}
4685
Russell King4031bbe2006-01-06 11:41:00 +00004686static void ide_tape_remove(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004687{
4688 idetape_tape_t *tape = drive->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004689
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02004690 ide_proc_unregister_driver(drive, tape->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004691
4692 ide_unregister_region(tape->disk);
4693
4694 ide_tape_put(tape);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004695}
4696
4697static void ide_tape_release(struct kref *kref)
4698{
4699 struct ide_tape_obj *tape = to_ide_tape(kref);
4700 ide_drive_t *drive = tape->drive;
4701 struct gendisk *g = tape->disk;
4702
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004703 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
4704
Linus Torvalds1da177e2005-04-16 15:20:36 -07004705 drive->dsc_overlap = 0;
4706 drive->driver_data = NULL;
Tony Jonesdbc12722007-09-25 02:03:03 +02004707 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
4708 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
Linus Torvalds1da177e2005-04-16 15:20:36 -07004709 idetape_devs[tape->minor] = NULL;
4710 g->private_data = NULL;
4711 put_disk(g);
4712 kfree(tape);
4713}
4714
Bartlomiej Zolnierkiewiczecfd80e2007-05-10 00:01:09 +02004715#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07004716static int proc_idetape_read_name
4717 (char *page, char **start, off_t off, int count, int *eof, void *data)
4718{
4719 ide_drive_t *drive = (ide_drive_t *) data;
4720 idetape_tape_t *tape = drive->driver_data;
4721 char *out = page;
4722 int len;
4723
4724 len = sprintf(out, "%s\n", tape->name);
4725 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
4726}
4727
4728static ide_proc_entry_t idetape_proc[] = {
4729 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
4730 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
4731 { NULL, 0, NULL, NULL }
4732};
Linus Torvalds1da177e2005-04-16 15:20:36 -07004733#endif
4734
Russell King4031bbe2006-01-06 11:41:00 +00004735static int ide_tape_probe(ide_drive_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004736
Linus Torvalds1da177e2005-04-16 15:20:36 -07004737static ide_driver_t idetape_driver = {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004738 .gen_driver = {
Laurent Riffard4ef3b8f2005-11-18 22:15:40 +01004739 .owner = THIS_MODULE,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004740 .name = "ide-tape",
4741 .bus = &ide_bus_type,
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004742 },
Russell King4031bbe2006-01-06 11:41:00 +00004743 .probe = ide_tape_probe,
4744 .remove = ide_tape_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004745 .version = IDETAPE_VERSION,
4746 .media = ide_tape,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004747 .supports_dsc_overlap = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004748 .do_request = idetape_do_request,
4749 .end_request = idetape_end_request,
4750 .error = __ide_error,
4751 .abort = __ide_abort,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02004752#ifdef CONFIG_IDE_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07004753 .proc = idetape_proc,
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02004754#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07004755};
4756
4757/*
4758 * Our character device supporting functions, passed to register_chrdev.
4759 */
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08004760static const struct file_operations idetape_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004761 .owner = THIS_MODULE,
4762 .read = idetape_chrdev_read,
4763 .write = idetape_chrdev_write,
4764 .ioctl = idetape_chrdev_ioctl,
4765 .open = idetape_chrdev_open,
4766 .release = idetape_chrdev_release,
4767};
4768
4769static int idetape_open(struct inode *inode, struct file *filp)
4770{
4771 struct gendisk *disk = inode->i_bdev->bd_disk;
4772 struct ide_tape_obj *tape;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004773
4774 if (!(tape = ide_tape_get(disk)))
4775 return -ENXIO;
4776
Linus Torvalds1da177e2005-04-16 15:20:36 -07004777 return 0;
4778}
4779
4780static int idetape_release(struct inode *inode, struct file *filp)
4781{
4782 struct gendisk *disk = inode->i_bdev->bd_disk;
4783 struct ide_tape_obj *tape = ide_tape_g(disk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004784
4785 ide_tape_put(tape);
4786
4787 return 0;
4788}
4789
4790static int idetape_ioctl(struct inode *inode, struct file *file,
4791 unsigned int cmd, unsigned long arg)
4792{
4793 struct block_device *bdev = inode->i_bdev;
4794 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
4795 ide_drive_t *drive = tape->drive;
4796 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
4797 if (err == -EINVAL)
4798 err = idetape_blkdev_ioctl(drive, cmd, arg);
4799 return err;
4800}
4801
4802static struct block_device_operations idetape_block_ops = {
4803 .owner = THIS_MODULE,
4804 .open = idetape_open,
4805 .release = idetape_release,
4806 .ioctl = idetape_ioctl,
4807};
4808
Russell King4031bbe2006-01-06 11:41:00 +00004809static int ide_tape_probe(ide_drive_t *drive)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004810{
4811 idetape_tape_t *tape;
4812 struct gendisk *g;
4813 int minor;
4814
4815 if (!strstr("ide-tape", drive->driver_req))
4816 goto failed;
4817 if (!drive->present)
4818 goto failed;
4819 if (drive->media != ide_tape)
4820 goto failed;
4821 if (!idetape_identify_device (drive)) {
4822 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
4823 goto failed;
4824 }
4825 if (drive->scsi) {
4826 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
4827 goto failed;
4828 }
4829 if (strstr(drive->id->model, "OnStream DI-")) {
4830 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
4831 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
4832 }
Robert P. J. Day5cbded52006-12-13 00:35:56 -08004833 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004834 if (tape == NULL) {
4835 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
4836 goto failed;
4837 }
4838
4839 g = alloc_disk(1 << PARTN_BITS);
4840 if (!g)
4841 goto out_free_tape;
4842
4843 ide_init_disk(g, drive);
4844
Bartlomiej Zolnierkiewicz7662d042007-05-10 00:01:10 +02004845 ide_proc_register_driver(drive, &idetape_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004846
Linus Torvalds1da177e2005-04-16 15:20:36 -07004847 kref_init(&tape->kref);
4848
4849 tape->drive = drive;
4850 tape->driver = &idetape_driver;
4851 tape->disk = g;
4852
4853 g->private_data = &tape->driver;
4854
4855 drive->driver_data = tape;
4856
Arjan van de Vencf8b8972006-03-23 03:00:45 -08004857 mutex_lock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004858 for (minor = 0; idetape_devs[minor]; minor++)
4859 ;
4860 idetape_devs[minor] = tape;
Arjan van de Vencf8b8972006-03-23 03:00:45 -08004861 mutex_unlock(&idetape_ref_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004862
4863 idetape_setup(drive, tape, minor);
4864
Tony Jonesdbc12722007-09-25 02:03:03 +02004865 device_create(idetape_sysfs_class, &drive->gendev,
4866 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
4867 device_create(idetape_sysfs_class, &drive->gendev,
4868 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
Will Dysond5dee802005-09-16 02:55:07 -07004869
Linus Torvalds1da177e2005-04-16 15:20:36 -07004870 g->fops = &idetape_block_ops;
4871 ide_register_region(g);
4872
4873 return 0;
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004874
Linus Torvalds1da177e2005-04-16 15:20:36 -07004875out_free_tape:
4876 kfree(tape);
4877failed:
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004878 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004879}
4880
4881MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4882MODULE_LICENSE("GPL");
4883
4884static void __exit idetape_exit (void)
4885{
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02004886 driver_unregister(&idetape_driver.gen_driver);
Will Dysond5dee802005-09-16 02:55:07 -07004887 class_destroy(idetape_sysfs_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004888 unregister_chrdev(IDETAPE_MAJOR, "ht");
4889}
4890
Bartlomiej Zolnierkiewicz17514e82005-11-19 22:24:35 +01004891static int __init idetape_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004892{
Will Dysond5dee802005-09-16 02:55:07 -07004893 int error = 1;
4894 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
4895 if (IS_ERR(idetape_sysfs_class)) {
4896 idetape_sysfs_class = NULL;
4897 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
4898 error = -EBUSY;
4899 goto out;
4900 }
4901
Linus Torvalds1da177e2005-04-16 15:20:36 -07004902 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
4903 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
Will Dysond5dee802005-09-16 02:55:07 -07004904 error = -EBUSY;
4905 goto out_free_class;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004906 }
Will Dysond5dee802005-09-16 02:55:07 -07004907
4908 error = driver_register(&idetape_driver.gen_driver);
4909 if (error)
4910 goto out_free_driver;
4911
4912 return 0;
4913
4914out_free_driver:
4915 driver_unregister(&idetape_driver.gen_driver);
4916out_free_class:
4917 class_destroy(idetape_sysfs_class);
4918out:
4919 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004920}
4921
Kay Sievers263756e2005-12-12 18:03:44 +01004922MODULE_ALIAS("ide:*m-tape*");
Linus Torvalds1da177e2005-04-16 15:20:36 -07004923module_init(idetape_init);
4924module_exit(idetape_exit);
4925MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);