2 * linux/drivers/ide/ide-tape.c Version 1.19 Nov, 2003
4 * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il>
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.
12 * It is hereby placed under the terms of the GNU general public license.
13 * (See linux/COPYING).
17 * IDE ATAPI streaming tape driver.
19 * This driver is a part of the Linux ide driver and works in co-operation
20 * with linux/drivers/block/ide.c.
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.
27 * Pipelined operation mode is now supported on both reads and writes.
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.
32 * The character device interface consists of the following devices:
34 * ht0 major 37, minor 0 first IDE tape, rewind on close.
35 * ht1 major 37, minor 1 second IDE tape, rewind on close.
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.
41 * Run linux/scripts/MAKEDEV.ide to create the above entries.
43 * The general magnetic tape commands compatible interface, as defined by
44 * include/linux/mtio.h, is accessible through the character device.
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.
50 * Our own ide-tape ioctl's can be issued to either the block device or
51 * the character device interface.
53 * Maximal throughput with minimal bus load will usually be achieved in the
56 * 1. ide-tape is operating in the pipelined operation mode.
57 * 2. No buffering is performed by the user backup program.
59 * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive.
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
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
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
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
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
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
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
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
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
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.
317 * Here are some words from the first releases of hd.c, which are quoted
318 * in ide.c and apply here as well:
320 * | Special care is recommended. Have Fun!
325 * An overview of the pipelined operation mode.
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.
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.
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.
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.
352 * However, there are some downfalls:
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.
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.
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.
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.
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.
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.
394 * For accurate tape positioning and error reporting, disabling
395 * pipelined mode might be the best option.
397 * You can enable/disable/tune the pipelined operation mode by adjusting
398 * the compile time parameters below.
402 * Possible improvements.
404 * 1. Support for the ATAPI overlap protocol.
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
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.
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.
425 #define IDETAPE_VERSION "1.19"
427 #include <linux/config.h>
428 #include <linux/module.h>
429 #include <linux/types.h>
430 #include <linux/string.h>
431 #include <linux/kernel.h>
432 #include <linux/delay.h>
433 #include <linux/timer.h>
434 #include <linux/mm.h>
435 #include <linux/interrupt.h>
436 #include <linux/major.h>
437 #include <linux/devfs_fs_kernel.h>
438 #include <linux/errno.h>
439 #include <linux/genhd.h>
440 #include <linux/slab.h>
441 #include <linux/pci.h>
442 #include <linux/ide.h>
443 #include <linux/smp_lock.h>
444 #include <linux/completion.h>
446 #include <asm/byteorder.h>
448 #include <asm/uaccess.h>
450 #include <asm/unaligned.h>
451 #include <asm/bitops.h>
456 typedef struct os_partition_s {
460 __u32 first_frame_addr;
461 __u32 last_frame_addr;
462 __u32 eod_frame_addr;
468 typedef struct os_dat_entry_s {
478 #define OS_DAT_FLAGS_DATA (0xc)
479 #define OS_DAT_FLAGS_MARK (0x1)
481 typedef struct os_dat_s {
486 os_dat_entry_t dat_list[16];
489 #include <linux/mtio.h>
491 /**************************** Tunable parameters *****************************/
495 * Pipelined mode parameters.
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:
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.
506 * Setting the following parameter to 0 is illegal: the pipelined mode
507 * cannot be disabled (calculate_speeds() divides by tape->max_stages.)
509 #define IDETAPE_MIN_PIPELINE_STAGES 1
510 #define IDETAPE_MAX_PIPELINE_STAGES 400
511 #define IDETAPE_INCREASE_STAGES_RATE 20
514 * The following are used to debug the driver:
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
521 * Setting them to 0 will restore normal operation mode:
523 * 1. Disable logging normal successful operations.
524 * 2. Disable self-sanity checks.
525 * 3. Errors will still be logged, of course.
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
531 #define IDETAPE_DEBUG_INFO 0
532 #define IDETAPE_DEBUG_LOG 0
533 #define IDETAPE_DEBUG_LOG_VERBOSE 0
534 #define IDETAPE_DEBUG_BUGS 1
537 * After each failed packet command we issue a request sense command
538 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
540 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
542 #define IDETAPE_MAX_PC_RETRIES 3
545 * With each packet command, we allocate a buffer of
546 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
547 * commands (Not for READ/WRITE commands).
549 #define IDETAPE_PC_BUFFER_SIZE 256
552 * In various places in the driver, we need to allocate storage
553 * for packet commands and requests, which will remain valid while
554 * we leave the driver to wait for an interrupt or a timeout event.
556 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
559 * Some drives (for example, Seagate STT3401A Travan) require a very long
560 * timeout, because they don't return an interrupt or clear their busy bit
561 * until after the command completes (even retension commands).
563 #define IDETAPE_WAIT_CMD (900*HZ)
566 * The following parameter is used to select the point in the internal
567 * tape fifo in which we will start to refill the buffer. Decreasing
568 * the following parameter will improve the system's latency and
569 * interactive response, while using a high value might improve sytem
572 #define IDETAPE_FIFO_THRESHOLD 2
575 * DSC polling parameters.
577 * Polling for DSC (a single bit in the status register) is a very
578 * important function in ide-tape. There are two cases in which we
581 * 1. Before a read/write packet command, to ensure that we
582 * can transfer data from/to the tape's data buffers, without
583 * causing an actual media access. In case the tape is not
584 * ready yet, we take out our request from the device
585 * request queue, so that ide.c will service requests from
586 * the other device on the same interface meanwhile.
588 * 2. After the successful initialization of a "media access
589 * packet command", which is a command which can take a long
590 * time to complete (it can be several seconds or even an hour).
592 * Again, we postpone our request in the middle to free the bus
593 * for the other device. The polling frequency here should be
594 * lower than the read/write frequency since those media access
595 * commands are slow. We start from a "fast" frequency -
596 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
597 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
598 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
600 * We also set a timeout for the timer, in case something goes wrong.
601 * The timeout should be longer then the maximum execution time of a
608 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
609 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
610 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
611 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
612 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
613 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
614 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
616 /*************************** End of tunable parameters ***********************/
619 * Debugging/Performance analysis
623 #define USE_IOTRACE 0
625 #include <linux/io_trace.h>
626 #define IO_IDETAPE_FIFO 500
630 * Read/Write error simulation
632 #define SIMULATE_ERRORS 0
635 * For general magnetic tape device compatibility.
638 idetape_direction_none,
639 idetape_direction_read,
640 idetape_direction_write
641 } idetape_chrdev_direction_t;
644 unsigned short b_size;
646 struct idetape_bh *b_reqnext;
651 * Our view of a packet command.
653 typedef struct idetape_packet_command_s {
654 u8 c[12]; /* Actual packet bytes */
655 int retries; /* On each retry, we increment retries */
656 int error; /* Error code */
657 int request_transfer; /* Bytes to transfer */
658 int actually_transferred; /* Bytes actually transferred */
659 int buffer_size; /* Size of our data buffer */
660 struct idetape_bh *bh;
663 u8 *buffer; /* Data buffer */
664 u8 *current_position; /* Pointer into the above buffer */
665 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
666 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
667 unsigned long flags; /* Status/Action bit flags: long for set_bit */
671 * Packet command flag bits.
673 /* Set when an error is considered normal - We won't retry */
675 /* 1 When polling for DSC on a media access command */
676 #define PC_WAIT_FOR_DSC 1
677 /* 1 when we prefer to use DMA if possible */
678 #define PC_DMA_RECOMMENDED 2
679 /* 1 while DMA in progress */
680 #define PC_DMA_IN_PROGRESS 3
681 /* 1 when encountered problem during DMA */
682 #define PC_DMA_ERROR 4
687 * Capabilities and Mechanical Status Page
690 unsigned page_code :6; /* Page code - Should be 0x2a */
692 __u8 ps :1; /* parameters saveable */
693 __u8 page_length; /* Page Length - Should be 0x12 */
694 __u8 reserved2, reserved3;
695 unsigned ro :1; /* Read Only Mode */
696 unsigned reserved4_1234 :4;
697 unsigned sprev :1; /* Supports SPACE in the reverse direction */
698 unsigned reserved4_67 :2;
699 unsigned reserved5_012 :3;
700 unsigned efmt :1; /* Supports ERASE command initiated formatting */
701 unsigned reserved5_4 :1;
702 unsigned qfa :1; /* Supports the QFA two partition formats */
703 unsigned reserved5_67 :2;
704 unsigned lock :1; /* Supports locking the volume */
705 unsigned locked :1; /* The volume is locked */
706 unsigned prevent :1; /* The device defaults in the prevent state after power up */
707 unsigned eject :1; /* The device can eject the volume */
708 __u8 disconnect :1; /* The device can break request > ctl */
710 unsigned ecc :1; /* Supports error correction */
711 unsigned cmprs :1; /* Supports data compression */
712 unsigned reserved7_0 :1;
713 unsigned blk512 :1; /* Supports 512 bytes block size */
714 unsigned blk1024 :1; /* Supports 1024 bytes block size */
715 unsigned reserved7_3_6 :4;
716 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
717 /* transfers for slow buffer memory ??? */
718 /* Also 32768 block size in some cases */
719 __u16 max_speed; /* Maximum speed supported in KBps */
720 __u8 reserved10, reserved11;
721 __u16 ctl; /* Continuous Transfer Limit in blocks */
722 __u16 speed; /* Current Speed, in KBps */
723 __u16 buffer_size; /* Buffer Size, in 512 bytes */
724 __u8 reserved18, reserved19;
725 } idetape_capabilities_page_t;
731 unsigned page_code :6; /* Page code - Should be 0x30 */
732 unsigned reserved1_6 :1;
734 __u8 page_length; /* Page Length - Should be 2 */
737 unsigned play32_5 :1;
738 unsigned reserved2_23 :2;
739 unsigned record32 :1;
740 unsigned record32_5 :1;
741 unsigned reserved2_6 :1;
743 } idetape_block_size_page_t;
748 typedef struct idetape_stage_s {
749 struct request rq; /* The corresponding request */
750 struct idetape_bh *bh; /* The data buffers */
751 struct idetape_stage_s *next; /* Pointer to the next stage */
755 * REQUEST SENSE packet command result - Data Format.
758 unsigned error_code :7; /* Current of deferred errors */
759 unsigned valid :1; /* The information field conforms to QIC-157C */
760 __u8 reserved1 :8; /* Segment Number - Reserved */
761 unsigned sense_key :4; /* Sense Key */
762 unsigned reserved2_4 :1; /* Reserved */
763 unsigned ili :1; /* Incorrect Length Indicator */
764 unsigned eom :1; /* End Of Medium */
765 unsigned filemark :1; /* Filemark */
766 __u32 information __attribute__ ((packed));
767 __u8 asl; /* Additional sense length (n-7) */
768 __u32 command_specific; /* Additional command specific information */
769 __u8 asc; /* Additional Sense Code */
770 __u8 ascq; /* Additional Sense Code Qualifier */
771 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */
772 unsigned sk_specific1 :7; /* Sense Key Specific */
773 unsigned sksv :1; /* Sense Key Specific information is valid */
774 __u8 sk_specific2; /* Sense Key Specific */
775 __u8 sk_specific3; /* Sense Key Specific */
776 __u8 pad[2]; /* Padding to 20 bytes */
777 } idetape_request_sense_result_t;
781 * Most of our global data which we need to save even as we leave the
782 * driver due to an interrupt or a timer event is stored in a variable
783 * of type idetape_tape_t, defined below.
788 * Since a typical character device operation requires more
789 * than one packet command, we provide here enough memory
790 * for the maximum of interconnected packet commands.
791 * The packet commands are stored in the circular array pc_stack.
792 * pc_stack_index points to the last used entry, and warps around
793 * to the start when we get to the last array entry.
795 * pc points to the current processed packet command.
797 * failed_pc points to the last failed packet command, or contains
798 * NULL if we do not need to retry any packet command. This is
799 * required since an additional packet command is needed before the
800 * retry, to get detailed information on what went wrong.
802 /* Current packet command */
804 /* Last failed packet command */
805 idetape_pc_t *failed_pc;
806 /* Packet command stack */
807 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
808 /* Next free packet command storage space */
810 struct request rq_stack[IDETAPE_PC_STACK];
811 /* We implement a circular array */
815 * DSC polling variables.
817 * While polling for DSC we use postponed_rq to postpone the
818 * current request so that ide.c will be able to service
819 * pending requests on the other device. Note that at most
820 * we will have only one DSC (usually data transfer) request
821 * in the device request queue. Additional requests can be
822 * queued in our internal pipeline, but they will be visible
823 * to ide.c only one at a time.
825 struct request *postponed_rq;
826 /* The time in which we started polling for DSC */
827 unsigned long dsc_polling_start;
828 /* Timer used to poll for dsc */
829 struct timer_list dsc_timer;
830 /* Read/Write dsc polling frequency */
831 unsigned long best_dsc_rw_frequency;
832 /* The current polling frequency */
833 unsigned long dsc_polling_frequency;
834 /* Maximum waiting time */
835 unsigned long dsc_timeout;
838 * Read position information
842 unsigned int first_frame_position;
843 unsigned int last_frame_position;
844 unsigned int blocks_in_buffer;
847 * Last error information
849 u8 sense_key, asc, ascq;
852 * Character device operation
857 /* Current character device data transfer direction */
858 idetape_chrdev_direction_t chrdev_direction;
863 /* Usually 512 or 1024 bytes */
864 unsigned short tape_block_size;
866 /* Copy of the tape's Capabilities and Mechanical Page */
867 idetape_capabilities_page_t capabilities;
870 * Active data transfer request parameters.
872 * At most, there is only one ide-tape originated data transfer
873 * request in the device request queue. This allows ide.c to
874 * easily service requests from the other device when we
875 * postpone our active request. In the pipelined operation
876 * mode, we use our internal pipeline structure to hold
877 * more data requests.
879 * The data buffer size is chosen based on the tape's
882 /* Pointer to the request which is waiting in the device request queue */
883 struct request *active_data_request;
884 /* Data buffer size (chosen based on the tape's recommendation */
886 idetape_stage_t *merge_stage;
887 int merge_stage_size;
888 struct idetape_bh *bh;
893 * Pipeline parameters.
895 * To accomplish non-pipelined mode, we simply set the following
896 * variables to zero (or NULL, where appropriate).
898 /* Number of currently used stages */
900 /* Number of pending stages */
901 int nr_pending_stages;
902 /* We will not allocate more than this number of stages */
903 int max_stages, min_pipeline, max_pipeline;
904 /* The first stage which will be removed from the pipeline */
905 idetape_stage_t *first_stage;
906 /* The currently active stage */
907 idetape_stage_t *active_stage;
908 /* Will be serviced after the currently active request */
909 idetape_stage_t *next_stage;
910 /* New requests will be added to the pipeline here */
911 idetape_stage_t *last_stage;
912 /* Optional free stage which we can use */
913 idetape_stage_t *cache_stage;
915 /* Wasted space in each stage */
918 /* Status/Action flags: long for set_bit */
920 /* protects the ide-tape queue */
924 * Measures average tape speed
926 unsigned long avg_time;
930 /* last sense information */
931 idetape_request_sense_result_t sense;
935 char firmware_revision[6];
936 int firmware_revision_num;
938 /* the door is currently locked */
940 /* the tape hardware is write protected */
942 /* the tape is write protected (hardware or opened as read-only) */
946 * Limit the number of times a request can
947 * be postponed, to avoid an infinite postpone
950 /* request postpone count limit */
954 * Measures number of frames:
956 * 1. written/read to/from the driver pipeline (pipeline_head).
957 * 2. written/read to/from the tape buffers (idetape_bh).
958 * 3. written/read by the tape to/from the media (tape_head).
966 * Speed control at the tape buffers input/output
968 unsigned long insert_time;
971 int max_insert_speed;
972 int measure_insert_time;
975 * Measure tape still time, in milliseconds
977 unsigned long tape_still_time_begin;
981 * Speed regulation negative feedback loop
984 int pipeline_head_speed;
985 int controlled_pipeline_head_speed;
986 int uncontrolled_pipeline_head_speed;
987 int controlled_last_pipeline_head;
988 int uncontrolled_last_pipeline_head;
989 unsigned long uncontrolled_pipeline_head_time;
990 unsigned long controlled_pipeline_head_time;
991 int controlled_previous_pipeline_head;
992 int uncontrolled_previous_pipeline_head;
993 unsigned long controlled_previous_head_time;
994 unsigned long uncontrolled_previous_head_time;
995 int restart_speed_control_req;
998 * Debug_level determines amount of debugging output;
999 * can be changed using /proc/ide/hdx/settings
1000 * 0 : almost no debugging output
1001 * 1 : 0+output errors only
1002 * 2 : 1+output all sensekey/asc
1003 * 3 : 2+follow all chrdev related procedures
1004 * 4 : 3+follow all procedures
1005 * 5 : 4+include pc_stack rq_stack info
1006 * 6 : 5+USE_COUNT updates
1014 #define DOOR_UNLOCKED 0
1015 #define DOOR_LOCKED 1
1016 #define DOOR_EXPLICITLY_LOCKED 2
1019 * Tape flag bits values.
1021 #define IDETAPE_IGNORE_DSC 0
1022 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
1023 #define IDETAPE_BUSY 2 /* Device already opened */
1024 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
1025 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
1026 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
1027 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
1028 #define IDETAPE_READ_ERROR 7
1029 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
1030 /* 0 = no tape is loaded, so we don't rewind after ejecting */
1031 #define IDETAPE_MEDIUM_PRESENT 9
1034 * Supported ATAPI tape drives packet commands
1036 #define IDETAPE_TEST_UNIT_READY_CMD 0x00
1037 #define IDETAPE_REWIND_CMD 0x01
1038 #define IDETAPE_REQUEST_SENSE_CMD 0x03
1039 #define IDETAPE_READ_CMD 0x08
1040 #define IDETAPE_WRITE_CMD 0x0a
1041 #define IDETAPE_WRITE_FILEMARK_CMD 0x10
1042 #define IDETAPE_SPACE_CMD 0x11
1043 #define IDETAPE_INQUIRY_CMD 0x12
1044 #define IDETAPE_ERASE_CMD 0x19
1045 #define IDETAPE_MODE_SENSE_CMD 0x1a
1046 #define IDETAPE_MODE_SELECT_CMD 0x15
1047 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b
1048 #define IDETAPE_PREVENT_CMD 0x1e
1049 #define IDETAPE_LOCATE_CMD 0x2b
1050 #define IDETAPE_READ_POSITION_CMD 0x34
1051 #define IDETAPE_READ_BUFFER_CMD 0x3c
1052 #define IDETAPE_SET_SPEED_CMD 0xbb
1055 * Some defines for the READ BUFFER command
1057 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
1060 * Some defines for the SPACE command
1062 #define IDETAPE_SPACE_OVER_FILEMARK 1
1063 #define IDETAPE_SPACE_TO_EOD 3
1066 * Some defines for the LOAD UNLOAD command
1068 #define IDETAPE_LU_LOAD_MASK 1
1069 #define IDETAPE_LU_RETENSION_MASK 2
1070 #define IDETAPE_LU_EOT_MASK 4
1073 * Special requests for our block device strategy routine.
1075 * In order to service a character device command, we add special
1076 * requests to the tail of our block device request queue and wait
1077 * for their completion.
1081 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
1082 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
1083 REQ_IDETAPE_READ = (1 << 2),
1084 REQ_IDETAPE_WRITE = (1 << 3),
1085 REQ_IDETAPE_READ_BUFFER = (1 << 4),
1089 * Error codes which are returned in rq->errors to the higher part
1092 #define IDETAPE_ERROR_GENERAL 101
1093 #define IDETAPE_ERROR_FILEMARK 102
1094 #define IDETAPE_ERROR_EOD 103
1097 * idetape_chrdev_t provides the link between out character device
1098 * interface and our block device interface and the corresponding
1099 * ide_drive_t structure.
1106 * The following is used to format the general configuration word of
1107 * the ATAPI IDENTIFY DEVICE command.
1109 struct idetape_id_gcw {
1110 unsigned packet_size :2; /* Packet Size */
1111 unsigned reserved234 :3; /* Reserved */
1112 unsigned drq_type :2; /* Command packet DRQ type */
1113 unsigned removable :1; /* Removable media */
1114 unsigned device_type :5; /* Device type */
1115 unsigned reserved13 :1; /* Reserved */
1116 unsigned protocol :2; /* Protocol type */
1120 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
1123 unsigned device_type :5; /* Peripheral Device Type */
1124 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
1125 unsigned reserved1_6t0 :7; /* Reserved */
1126 unsigned rmb :1; /* Removable Medium Bit */
1127 unsigned ansi_version :3; /* ANSI Version */
1128 unsigned ecma_version :3; /* ECMA Version */
1129 unsigned iso_version :2; /* ISO Version */
1130 unsigned response_format :4; /* Response Data Format */
1131 unsigned reserved3_45 :2; /* Reserved */
1132 unsigned reserved3_6 :1; /* TrmIOP - Reserved */
1133 unsigned reserved3_7 :1; /* AENC - Reserved */
1134 __u8 additional_length; /* Additional Length (total_length-4) */
1135 __u8 rsv5, rsv6, rsv7; /* Reserved */
1136 __u8 vendor_id[8]; /* Vendor Identification */
1137 __u8 product_id[16]; /* Product Identification */
1138 __u8 revision_level[4]; /* Revision Level */
1139 __u8 vendor_specific[20]; /* Vendor Specific - Optional */
1140 __u8 reserved56t95[40]; /* Reserved - Optional */
1141 /* Additional information may be returned */
1142 } idetape_inquiry_result_t;
1145 * READ POSITION packet command - Data Format (From Table 6-57)
1148 unsigned reserved0_10 :2; /* Reserved */
1149 unsigned bpu :1; /* Block Position Unknown */
1150 unsigned reserved0_543 :3; /* Reserved */
1151 unsigned eop :1; /* End Of Partition */
1152 unsigned bop :1; /* Beginning Of Partition */
1153 u8 partition; /* Partition Number */
1154 u8 reserved2, reserved3; /* Reserved */
1155 u32 first_block; /* First Block Location */
1156 u32 last_block; /* Last Block Location (Optional) */
1157 u8 reserved12; /* Reserved */
1158 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
1159 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
1160 } idetape_read_position_result_t;
1163 * Follows structures which are related to the SELECT SENSE / MODE SENSE
1164 * packet commands. Those packet commands are still not supported
1167 #define IDETAPE_BLOCK_DESCRIPTOR 0
1168 #define IDETAPE_CAPABILITIES_PAGE 0x2a
1169 #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
1170 #define IDETAPE_BLOCK_SIZE_PAGE 0x30
1171 #define IDETAPE_BUFFER_FILLING_PAGE 0x33
1174 * Mode Parameter Header for the MODE SENSE packet command
1177 __u8 mode_data_length; /* Length of the following data transfer */
1178 __u8 medium_type; /* Medium Type */
1179 __u8 dsp; /* Device Specific Parameter */
1180 __u8 bdl; /* Block Descriptor Length */
1182 /* data transfer page */
1184 __u8 reserved0_6 :1;
1185 __u8 ps :1; /* parameters saveable */
1186 __u8 page_length; /* page Length == 0x02 */
1188 __u8 read32k :1; /* 32k blk size (data only) */
1189 __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */
1190 __u8 reserved3_23 :2;
1191 __u8 write32k :1; /* 32k blk size (data only) */
1192 __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */
1193 __u8 reserved3_6 :1;
1194 __u8 streaming :1; /* streaming mode enable */
1196 } idetape_mode_parameter_header_t;
1199 * Mode Parameter Block Descriptor the MODE SENSE packet command
1201 * Support for block descriptors is optional.
1204 __u8 density_code; /* Medium density code */
1205 __u8 blocks[3]; /* Number of blocks */
1206 __u8 reserved4; /* Reserved */
1207 __u8 length[3]; /* Block Length */
1208 } idetape_parameter_block_descriptor_t;
1211 * The Data Compression Page, as returned by the MODE SENSE packet command.
1214 unsigned page_code :6; /* Page Code - Should be 0xf */
1215 unsigned reserved0 :1; /* Reserved */
1217 __u8 page_length; /* Page Length - Should be 14 */
1218 unsigned reserved2 :6; /* Reserved */
1219 unsigned dcc :1; /* Data Compression Capable */
1220 unsigned dce :1; /* Data Compression Enable */
1221 unsigned reserved3 :5; /* Reserved */
1222 unsigned red :2; /* Report Exception on Decompression */
1223 unsigned dde :1; /* Data Decompression Enable */
1224 __u32 ca; /* Compression Algorithm */
1225 __u32 da; /* Decompression Algorithm */
1226 __u8 reserved[4]; /* Reserved */
1227 } idetape_data_compression_page_t;
1230 * The Medium Partition Page, as returned by the MODE SENSE packet command.
1233 unsigned page_code :6; /* Page Code - Should be 0x11 */
1234 unsigned reserved1_6 :1; /* Reserved */
1236 __u8 page_length; /* Page Length - Should be 6 */
1237 __u8 map; /* Maximum Additional Partitions - Should be 0 */
1238 __u8 apd; /* Additional Partitions Defined - Should be 0 */
1239 unsigned reserved4_012 :3; /* Reserved */
1240 unsigned psum :2; /* Should be 0 */
1241 unsigned idp :1; /* Should be 0 */
1242 unsigned sdp :1; /* Should be 0 */
1243 unsigned fdp :1; /* Fixed Data Partitions */
1244 __u8 mfr; /* Medium Format Recognition */
1245 __u8 reserved[2]; /* Reserved */
1246 } idetape_medium_partition_page_t;
1249 * Run time configurable parameters.
1252 int dsc_rw_frequency;
1253 int dsc_media_access_frequency;
1258 * The variables below are used for the character device interface.
1259 * Additional state variables are defined in our ide_drive_t structure.
1261 static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES];
1263 #if IDETAPE_DEBUG_LOG_VERBOSE
1266 * DO NOT REMOVE, BUILDING A VERBOSE DEBUG SCHEME FOR ATAPI
1269 char *idetape_sense_key_verbose(u8 idetape_sense_key)
1271 switch (idetape_sense_key) {
1274 sprintf(buf, "IDETAPE_SENSE (0x%02x)", idetape_sense_key);
1281 char *idetape_command_key_verbose(u8 idetape_command_key)
1283 switch (idetape_command_key) {
1284 case IDETAPE_TEST_UNIT_READY_CMD:
1285 return("TEST_UNIT_READY_CMD");
1286 case IDETAPE_REWIND_CMD:
1287 return("REWIND_CMD");
1288 case IDETAPE_REQUEST_SENSE_CMD:
1289 return("REQUEST_SENSE_CMD");
1290 case IDETAPE_READ_CMD:
1292 case IDETAPE_WRITE_CMD:
1293 return("WRITE_CMD");
1294 case IDETAPE_WRITE_FILEMARK_CMD:
1295 return("WRITE_FILEMARK_CMD");
1296 case IDETAPE_SPACE_CMD:
1297 return("SPACE_CMD");
1298 case IDETAPE_INQUIRY_CMD:
1299 return("INQUIRY_CMD");
1300 case IDETAPE_ERASE_CMD:
1301 return("ERASE_CMD");
1302 case IDETAPE_MODE_SENSE_CMD:
1303 return("MODE_SENSE_CMD");
1304 case IDETAPE_MODE_SELECT_CMD:
1305 return("MODE_SELECT_CMD");
1306 case IDETAPE_LOAD_UNLOAD_CMD:
1307 return("LOAD_UNLOAD_CMD");
1308 case IDETAPE_PREVENT_CMD:
1309 return("PREVENT_CMD");
1310 case IDETAPE_LOCATE_CMD:
1311 return("LOCATE_CMD");
1312 case IDETAPE_READ_POSITION_CMD:
1313 return("READ_POSITION_CMD");
1314 case IDETAPE_READ_BUFFER_CMD:
1315 return("READ_BUFFER_CMD");
1316 case IDETAPE_SET_SPEED_CMD:
1317 return("SET_SPEED_CMD");
1320 sprintf(buf, "CMD (0x%02x)", idetape_command_key);
1325 #endif /* IDETAPE_DEBUG_LOG_VERBOSE */
1328 * Function declarations
1331 static int idetape_chrdev_release (struct inode *inode, struct file *filp);
1332 static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
1335 * Too bad. The drive wants to send us data which we are not ready to accept.
1336 * Just throw it away.
1338 static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
1341 (void) HWIF(drive)->INB(IDE_DATA_REG);
1344 static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
1346 struct idetape_bh *bh = pc->bh;
1350 #if IDETAPE_DEBUG_BUGS
1352 printk(KERN_ERR "ide-tape: bh == NULL in "
1353 "idetape_input_buffers\n");
1354 idetape_discard_data(drive, bcount);
1357 #endif /* IDETAPE_DEBUG_BUGS */
1358 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
1359 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
1361 atomic_add(count, &bh->b_count);
1362 if (atomic_read(&bh->b_count) == bh->b_size) {
1365 atomic_set(&bh->b_count, 0);
1371 static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
1373 struct idetape_bh *bh = pc->bh;
1377 #if IDETAPE_DEBUG_BUGS
1379 printk(KERN_ERR "ide-tape: bh == NULL in "
1380 "idetape_output_buffers\n");
1383 #endif /* IDETAPE_DEBUG_BUGS */
1384 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
1385 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
1387 pc->b_data += count;
1388 pc->b_count -= count;
1390 pc->bh = bh = bh->b_reqnext;
1392 pc->b_data = bh->b_data;
1393 pc->b_count = atomic_read(&bh->b_count);
1399 static void idetape_update_buffers (idetape_pc_t *pc)
1401 struct idetape_bh *bh = pc->bh;
1403 unsigned int bcount = pc->actually_transferred;
1405 if (test_bit(PC_WRITING, &pc->flags))
1408 #if IDETAPE_DEBUG_BUGS
1410 printk(KERN_ERR "ide-tape: bh == NULL in "
1411 "idetape_update_buffers\n");
1414 #endif /* IDETAPE_DEBUG_BUGS */
1415 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
1416 atomic_set(&bh->b_count, count);
1417 if (atomic_read(&bh->b_count) == bh->b_size)
1425 * idetape_next_pc_storage returns a pointer to a place in which we can
1426 * safely store a packet command, even though we intend to leave the
1427 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
1428 * commands is allocated at initialization time.
1430 static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
1432 idetape_tape_t *tape = drive->driver_data;
1434 #if IDETAPE_DEBUG_LOG
1435 if (tape->debug_level >= 5)
1436 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n",
1437 tape->pc_stack_index);
1438 #endif /* IDETAPE_DEBUG_LOG */
1439 if (tape->pc_stack_index == IDETAPE_PC_STACK)
1440 tape->pc_stack_index=0;
1441 return (&tape->pc_stack[tape->pc_stack_index++]);
1445 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
1446 * Since we queue packet commands in the request queue, we need to
1447 * allocate a request, along with the allocation of a packet command.
1450 /**************************************************************
1452 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
1453 * followed later on by kfree(). -ml *
1455 **************************************************************/
1457 static struct request *idetape_next_rq_storage (ide_drive_t *drive)
1459 idetape_tape_t *tape = drive->driver_data;
1461 #if IDETAPE_DEBUG_LOG
1462 if (tape->debug_level >= 5)
1463 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n",
1464 tape->rq_stack_index);
1465 #endif /* IDETAPE_DEBUG_LOG */
1466 if (tape->rq_stack_index == IDETAPE_PC_STACK)
1467 tape->rq_stack_index=0;
1468 return (&tape->rq_stack[tape->rq_stack_index++]);
1472 * idetape_init_pc initializes a packet command.
1474 static void idetape_init_pc (idetape_pc_t *pc)
1476 memset(pc->c, 0, 12);
1479 pc->request_transfer = 0;
1480 pc->buffer = pc->pc_buffer;
1481 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
1487 * idetape_analyze_error is called on each failed packet command retry
1488 * to analyze the request sense. We currently do not utilize this
1491 static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result)
1493 idetape_tape_t *tape = drive->driver_data;
1494 idetape_pc_t *pc = tape->failed_pc;
1496 tape->sense = *result;
1497 tape->sense_key = result->sense_key;
1498 tape->asc = result->asc;
1499 tape->ascq = result->ascq;
1500 #if IDETAPE_DEBUG_LOG
1502 * Without debugging, we only log an error if we decided to
1505 if (tape->debug_level >= 1)
1506 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, "
1507 "asc = %x, ascq = %x\n",
1508 pc->c[0], result->sense_key,
1509 result->asc, result->ascq);
1510 #if IDETAPE_DEBUG_LOG_VERBOSE
1511 if (tape->debug_level >= 1)
1512 printk(KERN_INFO "ide-tape: pc = %s, sense key = %x, "
1513 "asc = %x, ascq = %x\n",
1514 idetape_command_key_verbose((byte) pc->c[0]),
1518 #endif /* IDETAPE_DEBUG_LOG_VERBOSE */
1519 #endif /* IDETAPE_DEBUG_LOG */
1522 * Correct pc->actually_transferred by asking the tape.
1524 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
1525 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information));
1526 idetape_update_buffers(pc);
1530 * If error was the result of a zero-length read or write command,
1531 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
1532 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
1534 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD)
1535 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */
1536 if (result->sense_key == 5) {
1537 /* don't report an error, everything's ok */
1539 /* don't retry read/write */
1540 set_bit(PC_ABORT, &pc->flags);
1543 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
1544 pc->error = IDETAPE_ERROR_FILEMARK;
1545 set_bit(PC_ABORT, &pc->flags);
1547 if (pc->c[0] == IDETAPE_WRITE_CMD) {
1549 (result->sense_key == 0xd && result->asc == 0x0 &&
1550 result->ascq == 0x2)) {
1551 pc->error = IDETAPE_ERROR_EOD;
1552 set_bit(PC_ABORT, &pc->flags);
1555 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
1556 if (result->sense_key == 8) {
1557 pc->error = IDETAPE_ERROR_EOD;
1558 set_bit(PC_ABORT, &pc->flags);
1560 if (!test_bit(PC_ABORT, &pc->flags) &&
1561 pc->actually_transferred)
1562 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
1567 * idetape_active_next_stage will declare the next stage as "active".
1569 static void idetape_active_next_stage (ide_drive_t *drive)
1571 idetape_tape_t *tape = drive->driver_data;
1572 idetape_stage_t *stage = tape->next_stage;
1573 struct request *rq = &stage->rq;
1575 #if IDETAPE_DEBUG_LOG
1576 if (tape->debug_level >= 4)
1577 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
1578 #endif /* IDETAPE_DEBUG_LOG */
1579 #if IDETAPE_DEBUG_BUGS
1580 if (stage == NULL) {
1581 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
1584 #endif /* IDETAPE_DEBUG_BUGS */
1587 rq->special = (void *)stage->bh;
1588 tape->active_data_request = rq;
1589 tape->active_stage = stage;
1590 tape->next_stage = stage->next;
1594 * idetape_increase_max_pipeline_stages is a part of the feedback
1595 * loop which tries to find the optimum number of stages. In the
1596 * feedback loop, we are starting from a minimum maximum number of
1597 * stages, and if we sense that the pipeline is empty, we try to
1598 * increase it, until we reach the user compile time memory limit.
1600 static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
1602 idetape_tape_t *tape = drive->driver_data;
1603 int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
1605 #if IDETAPE_DEBUG_LOG
1606 if (tape->debug_level >= 4)
1607 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
1608 #endif /* IDETAPE_DEBUG_LOG */
1610 tape->max_stages += max(increase, 1);
1611 tape->max_stages = max(tape->max_stages, tape->min_pipeline);
1612 tape->max_stages = min(tape->max_stages, tape->max_pipeline);
1616 * idetape_kfree_stage calls kfree to completely free a stage, along with
1617 * its related buffers.
1619 static void __idetape_kfree_stage (idetape_stage_t *stage)
1621 struct idetape_bh *prev_bh, *bh = stage->bh;
1624 while (bh != NULL) {
1625 if (bh->b_data != NULL) {
1626 size = (int) bh->b_size;
1628 free_page((unsigned long) bh->b_data);
1630 bh->b_data += PAGE_SIZE;
1640 static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
1642 __idetape_kfree_stage(stage);
1646 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1647 * The caller should avoid race conditions.
1649 static void idetape_remove_stage_head (ide_drive_t *drive)
1651 idetape_tape_t *tape = drive->driver_data;
1652 idetape_stage_t *stage;
1654 #if IDETAPE_DEBUG_LOG
1655 if (tape->debug_level >= 4)
1656 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
1657 #endif /* IDETAPE_DEBUG_LOG */
1658 #if IDETAPE_DEBUG_BUGS
1659 if (tape->first_stage == NULL) {
1660 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
1663 if (tape->active_stage == tape->first_stage) {
1664 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
1667 #endif /* IDETAPE_DEBUG_BUGS */
1668 stage = tape->first_stage;
1669 tape->first_stage = stage->next;
1670 idetape_kfree_stage(tape, stage);
1672 if (tape->first_stage == NULL) {
1673 tape->last_stage = NULL;
1674 #if IDETAPE_DEBUG_BUGS
1675 if (tape->next_stage != NULL)
1676 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
1677 if (tape->nr_stages)
1678 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
1679 #endif /* IDETAPE_DEBUG_BUGS */
1684 * This will free all the pipeline stages starting from new_last_stage->next
1685 * to the end of the list, and point tape->last_stage to new_last_stage.
1687 static void idetape_abort_pipeline(ide_drive_t *drive,
1688 idetape_stage_t *new_last_stage)
1690 idetape_tape_t *tape = drive->driver_data;
1691 idetape_stage_t *stage = new_last_stage->next;
1692 idetape_stage_t *nstage;
1694 #if IDETAPE_DEBUG_LOG
1695 if (tape->debug_level >= 4)
1696 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
1699 nstage = stage->next;
1700 idetape_kfree_stage(tape, stage);
1702 --tape->nr_pending_stages;
1706 new_last_stage->next = NULL;
1707 tape->last_stage = new_last_stage;
1708 tape->next_stage = NULL;
1712 * idetape_end_request is used to finish servicing a request, and to
1713 * insert a pending pipeline request into the main device queue.
1715 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
1717 struct request *rq = HWGROUP(drive)->rq;
1718 idetape_tape_t *tape = drive->driver_data;
1719 unsigned long flags;
1721 int remove_stage = 0;
1722 idetape_stage_t *active_stage;
1724 #if IDETAPE_DEBUG_LOG
1725 if (tape->debug_level >= 4)
1726 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n");
1727 #endif /* IDETAPE_DEBUG_LOG */
1730 case 0: error = IDETAPE_ERROR_GENERAL; break;
1731 case 1: error = 0; break;
1732 default: error = uptodate;
1736 tape->failed_pc = NULL;
1738 spin_lock_irqsave(&tape->spinlock, flags);
1740 /* The request was a pipelined data transfer request */
1741 if (tape->active_data_request == rq) {
1742 active_stage = tape->active_stage;
1743 tape->active_stage = NULL;
1744 tape->active_data_request = NULL;
1745 tape->nr_pending_stages--;
1746 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1749 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1750 if (error == IDETAPE_ERROR_EOD)
1751 idetape_abort_pipeline(drive, active_stage);
1753 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
1754 if (error == IDETAPE_ERROR_EOD) {
1755 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1756 idetape_abort_pipeline(drive, active_stage);
1759 if (tape->next_stage != NULL) {
1760 idetape_active_next_stage(drive);
1763 * Insert the next request into the request queue.
1765 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
1766 } else if (!error) {
1767 idetape_increase_max_pipeline_stages(drive);
1770 ide_end_drive_cmd(drive, 0, 0);
1771 // blkdev_dequeue_request(rq);
1772 // drive->rq = NULL;
1773 // end_that_request_last(rq);
1776 idetape_remove_stage_head(drive);
1777 if (tape->active_data_request == NULL)
1778 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1779 spin_unlock_irqrestore(&tape->spinlock, flags);
1783 static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
1785 idetape_tape_t *tape = drive->driver_data;
1787 #if IDETAPE_DEBUG_LOG
1788 if (tape->debug_level >= 4)
1789 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
1790 #endif /* IDETAPE_DEBUG_LOG */
1791 if (!tape->pc->error) {
1792 idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer);
1793 idetape_end_request(drive, 1, 0);
1795 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1796 idetape_end_request(drive, 0, 0);
1801 static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
1803 idetape_init_pc(pc);
1804 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
1806 pc->request_transfer = 20;
1807 pc->callback = &idetape_request_sense_callback;
1810 static void idetape_init_rq(struct request *rq, u8 cmd)
1812 memset(rq, 0, sizeof(*rq));
1813 rq->flags = REQ_SPECIAL;
1818 * idetape_queue_pc_head generates a new packet command request in front
1819 * of the request queue, before the current request, so that it will be
1820 * processed immediately, on the next pass through the driver.
1822 * idetape_queue_pc_head is called from the request handling part of
1823 * the driver (the "bottom" part). Safe storage for the request should
1824 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1825 * before calling idetape_queue_pc_head.
1827 * Memory for those requests is pre-allocated at initialization time, and
1828 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1829 * space for the maximum possible number of inter-dependent packet commands.
1831 * The higher level of the driver - The ioctl handler and the character
1832 * device handling functions should queue request to the lower level part
1833 * and wait for their completion using idetape_queue_pc_tail or
1834 * idetape_queue_rw_tail.
1836 static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
1838 idetape_init_rq(rq, REQ_IDETAPE_PC1);
1839 rq->buffer = (char *) pc;
1840 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
1844 * idetape_retry_pc is called when an error was detected during the
1845 * last packet command. We queue a request sense packet command in
1846 * the head of the request list.
1848 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
1850 idetape_tape_t *tape = drive->driver_data;
1853 atapi_error_t error;
1855 error.all = HWIF(drive)->INB(IDE_ERROR_REG);
1856 pc = idetape_next_pc_storage(drive);
1857 rq = idetape_next_rq_storage(drive);
1858 idetape_create_request_sense_cmd(pc);
1859 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1860 idetape_queue_pc_head(drive, pc, rq);
1865 * idetape_postpone_request postpones the current request so that
1866 * ide.c will be able to service requests from another device on
1867 * the same hwgroup while we are polling for DSC.
1869 static void idetape_postpone_request (ide_drive_t *drive)
1871 idetape_tape_t *tape = drive->driver_data;
1873 #if IDETAPE_DEBUG_LOG
1874 if (tape->debug_level >= 4)
1875 printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
1877 tape->postponed_rq = HWGROUP(drive)->rq;
1878 ide_stall_queue(drive, tape->dsc_polling_frequency);
1882 * idetape_pc_intr is the usual interrupt handler which will be called
1883 * during a packet command. We will transfer some of the data (as
1884 * requested by the drive) and will re-point interrupt handler to us.
1885 * When data transfer is finished, we will act according to the
1886 * algorithm described before idetape_issue_packet_command.
1889 static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
1891 ide_hwif_t *hwif = drive->hwif;
1892 idetape_tape_t *tape = drive->driver_data;
1893 atapi_status_t status;
1894 atapi_bcount_t bcount;
1895 atapi_ireason_t ireason;
1896 idetape_pc_t *pc = tape->pc;
1900 static int error_sim_count = 0;
1903 #if IDETAPE_DEBUG_LOG
1904 if (tape->debug_level >= 4)
1905 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
1906 "interrupt handler\n");
1907 #endif /* IDETAPE_DEBUG_LOG */
1909 /* Clear the interrupt */
1910 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
1912 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1913 if (HWIF(drive)->ide_dma_end(drive) || status.b.check) {
1915 * A DMA error is sometimes expected. For example,
1916 * if the tape is crossing a filemark during a
1917 * READ command, it will issue an irq and position
1918 * itself before the filemark, so that only a partial
1919 * data transfer will occur (which causes the DMA
1920 * error). In that case, we will later ask the tape
1921 * how much bytes of the original request were
1922 * actually transferred (we can't receive that
1923 * information from the DMA engine on most chipsets).
1927 * On the contrary, a DMA error is never expected;
1928 * it usually indicates a hardware error or abort.
1929 * If the tape crosses a filemark during a READ
1930 * command, it will issue an irq and position itself
1931 * after the filemark (not before). Only a partial
1932 * data transfer will occur, but no DMA error.
1935 set_bit(PC_DMA_ERROR, &pc->flags);
1937 pc->actually_transferred = pc->request_transfer;
1938 idetape_update_buffers(pc);
1940 #if IDETAPE_DEBUG_LOG
1941 if (tape->debug_level >= 4)
1942 printk(KERN_INFO "ide-tape: DMA finished\n");
1943 #endif /* IDETAPE_DEBUG_LOG */
1946 /* No more interrupts */
1947 if (!status.b.drq) {
1948 #if IDETAPE_DEBUG_LOG
1949 if (tape->debug_level >= 2)
1950 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
1951 #endif /* IDETAPE_DEBUG_LOG */
1952 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1957 if ((pc->c[0] == IDETAPE_WRITE_CMD ||
1958 pc->c[0] == IDETAPE_READ_CMD) &&
1959 (++error_sim_count % 100) == 0) {
1960 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1965 if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
1967 if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) { /* Error detected */
1968 #if IDETAPE_DEBUG_LOG
1969 if (tape->debug_level >= 1)
1970 printk(KERN_INFO "ide-tape: %s: I/O error\n",
1972 #endif /* IDETAPE_DEBUG_LOG */
1973 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1974 printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
1975 return ide_do_reset(drive);
1977 #if IDETAPE_DEBUG_LOG
1978 if (tape->debug_level >= 1)
1979 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
1981 /* Retry operation */
1982 return idetape_retry_pc(drive);
1985 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
1987 /* Media access command */
1988 tape->dsc_polling_start = jiffies;
1989 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
1990 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1991 /* Allow ide.c to handle other requests */
1992 idetape_postpone_request(drive);
1995 if (tape->failed_pc == pc)
1996 tape->failed_pc = NULL;
1997 /* Command finished - Call the callback function */
1998 return pc->callback(drive);
2000 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
2001 printk(KERN_ERR "ide-tape: The tape wants to issue more "
2002 "interrupts in DMA mode\n");
2003 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
2004 (void)__ide_dma_off(drive);
2005 return ide_do_reset(drive);
2007 /* Get the number of bytes to transfer on this interrupt. */
2008 bcount.b.high = hwif->INB(IDE_BCOUNTH_REG);
2009 bcount.b.low = hwif->INB(IDE_BCOUNTL_REG);
2011 ireason.all = hwif->INB(IDE_IREASON_REG);
2013 if (ireason.b.cod) {
2014 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
2015 return ide_do_reset(drive);
2017 if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
2018 /* Hopefully, we will never get here */
2019 printk(KERN_ERR "ide-tape: We wanted to %s, ",
2020 ireason.b.io ? "Write":"Read");
2021 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
2022 ireason.b.io ? "Read":"Write");
2023 return ide_do_reset(drive);
2025 if (!test_bit(PC_WRITING, &pc->flags)) {
2026 /* Reading - Check that we have enough space */
2027 temp = pc->actually_transferred + bcount.all;
2028 if (temp > pc->request_transfer) {
2029 if (temp > pc->buffer_size) {
2030 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
2031 idetape_discard_data(drive, bcount.all);
2032 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2035 #if IDETAPE_DEBUG_LOG
2036 if (tape->debug_level >= 2)
2037 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
2038 #endif /* IDETAPE_DEBUG_LOG */
2041 if (test_bit(PC_WRITING, &pc->flags)) {
2043 idetape_output_buffers(drive, pc, bcount.all);
2045 /* Write the current buffer */
2046 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
2049 idetape_input_buffers(drive, pc, bcount.all);
2051 /* Read the current buffer */
2052 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
2054 /* Update the current position */
2055 pc->actually_transferred += bcount.all;
2056 pc->current_position += bcount.all;
2057 #if IDETAPE_DEBUG_LOG
2058 if (tape->debug_level >= 2)
2059 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all);
2061 /* And set the interrupt handler again */
2062 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2067 * Packet Command Interface
2069 * The current Packet Command is available in tape->pc, and will not
2070 * change until we finish handling it. Each packet command is associated
2071 * with a callback function that will be called when the command is
2074 * The handling will be done in three stages:
2076 * 1. idetape_issue_packet_command will send the packet command to the
2077 * drive, and will set the interrupt handler to idetape_pc_intr.
2079 * 2. On each interrupt, idetape_pc_intr will be called. This step
2080 * will be repeated until the device signals us that no more
2081 * interrupts will be issued.
2083 * 3. ATAPI Tape media access commands have immediate status with a
2084 * delayed process. In case of a successful initiation of a
2085 * media access packet command, the DSC bit will be set when the
2086 * actual execution of the command is finished.
2087 * Since the tape drive will not issue an interrupt, we have to
2088 * poll for this event. In this case, we define the request as
2089 * "low priority request" by setting rq_status to
2090 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
2093 * ide.c will then give higher priority to requests which
2094 * originate from the other device, until will change rq_status
2097 * 4. When the packet command is finished, it will be checked for errors.
2099 * 5. In case an error was found, we queue a request sense packet
2100 * command in front of the request queue and retry the operation
2101 * up to IDETAPE_MAX_PC_RETRIES times.
2103 * 6. In case no error was found, or we decided to give up and not
2104 * to retry again, the callback function will be called and then
2105 * we will handle the next request.
2108 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
2110 ide_hwif_t *hwif = drive->hwif;
2111 idetape_tape_t *tape = drive->driver_data;
2112 idetape_pc_t *pc = tape->pc;
2113 atapi_ireason_t ireason;
2115 ide_startstop_t startstop;
2117 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
2118 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
2121 ireason.all = hwif->INB(IDE_IREASON_REG);
2122 while (retries-- && (!ireason.b.cod || ireason.b.io)) {
2123 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
2124 "a packet command, retrying\n");
2126 ireason.all = hwif->INB(IDE_IREASON_REG);
2128 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
2129 "issuing a packet command, ignoring\n");
2134 if (!ireason.b.cod || ireason.b.io) {
2135 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
2136 "a packet command\n");
2137 return ide_do_reset(drive);
2139 /* Set the interrupt routine */
2140 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2141 #ifdef CONFIG_BLK_DEV_IDEDMA
2142 /* Begin DMA, if necessary */
2143 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
2144 (void) (HWIF(drive)->ide_dma_begin(drive));
2146 /* Send the actual packet */
2147 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
2151 static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
2153 ide_hwif_t *hwif = drive->hwif;
2154 idetape_tape_t *tape = drive->driver_data;
2155 atapi_bcount_t bcount;
2158 #if IDETAPE_DEBUG_BUGS
2159 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD &&
2160 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2161 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
2162 "Two request sense in serial were issued\n");
2164 #endif /* IDETAPE_DEBUG_BUGS */
2166 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
2167 tape->failed_pc = pc;
2168 /* Set the current packet command */
2171 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
2172 test_bit(PC_ABORT, &pc->flags)) {
2174 * We will "abort" retrying a packet command in case
2175 * a legitimate error code was received (crossing a
2176 * filemark, or end of the media, for example).
2178 if (!test_bit(PC_ABORT, &pc->flags)) {
2179 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD &&
2180 tape->sense_key == 2 && tape->asc == 4 &&
2181 (tape->ascq == 1 || tape->ascq == 8))) {
2182 printk(KERN_ERR "ide-tape: %s: I/O error, "
2183 "pc = %2x, key = %2x, "
2184 "asc = %2x, ascq = %2x\n",
2185 tape->name, pc->c[0],
2186 tape->sense_key, tape->asc,
2190 pc->error = IDETAPE_ERROR_GENERAL;
2192 tape->failed_pc = NULL;
2193 return pc->callback(drive);
2195 #if IDETAPE_DEBUG_LOG
2196 if (tape->debug_level >= 2)
2197 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
2198 #endif /* IDETAPE_DEBUG_LOG */
2201 /* We haven't transferred any data yet */
2202 pc->actually_transferred = 0;
2203 pc->current_position = pc->buffer;
2204 /* Request to transfer the entire buffer at once */
2205 bcount.all = pc->request_transfer;
2207 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
2208 printk(KERN_WARNING "ide-tape: DMA disabled, "
2209 "reverting to PIO\n");
2210 (void)__ide_dma_off(drive);
2212 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) {
2213 if (test_bit(PC_WRITING, &pc->flags))
2214 dma_ok = !HWIF(drive)->ide_dma_write(drive);
2216 dma_ok = !HWIF(drive)->ide_dma_read(drive);
2219 if (IDE_CONTROL_REG)
2220 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
2221 hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */
2222 hwif->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
2223 hwif->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
2224 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
2225 if (dma_ok) /* Will begin DMA later */
2226 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
2227 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
2228 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL);
2229 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2232 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2233 return idetape_transfer_pc(drive);
2238 * General packet command callback function.
2240 static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
2242 idetape_tape_t *tape = drive->driver_data;
2244 #if IDETAPE_DEBUG_LOG
2245 if (tape->debug_level >= 4)
2246 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
2247 #endif /* IDETAPE_DEBUG_LOG */
2249 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
2254 * A mode sense command is used to "sense" tape parameters.
2256 static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
2258 idetape_init_pc(pc);
2259 pc->c[0] = IDETAPE_MODE_SENSE_CMD;
2260 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
2261 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
2262 pc->c[2] = page_code;
2264 * Changed pc->c[3] to 0 (255 will at best return unused info).
2266 * For SCSI this byte is defined as subpage instead of high byte
2267 * of length and some IDE drives seem to interpret it this way
2268 * and return an error when 255 is used.
2271 pc->c[4] = 255; /* (We will just discard data in that case) */
2272 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
2273 pc->request_transfer = 12;
2274 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
2275 pc->request_transfer = 24;
2277 pc->request_transfer = 50;
2278 pc->callback = &idetape_pc_callback;
2281 static void calculate_speeds(ide_drive_t *drive)
2283 idetape_tape_t *tape = drive->driver_data;
2284 int full = 125, empty = 75;
2286 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
2287 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
2288 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
2289 tape->controlled_last_pipeline_head = tape->pipeline_head;
2290 tape->controlled_pipeline_head_time = jiffies;
2292 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
2293 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
2294 else if (time_after(jiffies, tape->controlled_previous_head_time))
2295 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
2297 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
2298 /* -1 for read mode error recovery */
2299 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
2300 tape->uncontrolled_pipeline_head_time = jiffies;
2301 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
2304 tape->uncontrolled_previous_head_time = jiffies;
2305 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
2306 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
2307 tape->uncontrolled_pipeline_head_time = jiffies;
2310 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
2311 if (tape->speed_control == 0) {
2312 tape->max_insert_speed = 5000;
2313 } else if (tape->speed_control == 1) {
2314 if (tape->nr_pending_stages >= tape->max_stages / 2)
2315 tape->max_insert_speed = tape->pipeline_head_speed +
2316 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
2318 tape->max_insert_speed = 500 +
2319 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
2320 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
2321 tape->max_insert_speed = 5000;
2322 } else if (tape->speed_control == 2) {
2323 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
2324 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
2326 tape->max_insert_speed = tape->speed_control;
2327 tape->max_insert_speed = max(tape->max_insert_speed, 500);
2330 static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
2332 idetape_tape_t *tape = drive->driver_data;
2333 idetape_pc_t *pc = tape->pc;
2334 atapi_status_t status;
2336 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
2338 if (status.b.check) {
2339 /* Error detected */
2340 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
2341 printk(KERN_ERR "ide-tape: %s: I/O error, ",
2343 /* Retry operation */
2344 return idetape_retry_pc(drive);
2347 if (tape->failed_pc == pc)
2348 tape->failed_pc = NULL;
2350 pc->error = IDETAPE_ERROR_GENERAL;
2351 tape->failed_pc = NULL;
2353 return pc->callback(drive);
2356 static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
2358 idetape_tape_t *tape = drive->driver_data;
2359 struct request *rq = HWGROUP(drive)->rq;
2360 int blocks = tape->pc->actually_transferred / tape->tape_block_size;
2362 tape->avg_size += blocks * tape->tape_block_size;
2363 tape->insert_size += blocks * tape->tape_block_size;
2364 if (tape->insert_size > 1024 * 1024)
2365 tape->measure_insert_time = 1;
2366 if (tape->measure_insert_time) {
2367 tape->measure_insert_time = 0;
2368 tape->insert_time = jiffies;
2369 tape->insert_size = 0;
2371 if (time_after(jiffies, tape->insert_time))
2372 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2373 if (jiffies - tape->avg_time >= HZ) {
2374 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
2376 tape->avg_time = jiffies;
2379 #if IDETAPE_DEBUG_LOG
2380 if (tape->debug_level >= 4)
2381 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
2382 #endif /* IDETAPE_DEBUG_LOG */
2384 tape->first_frame_position += blocks;
2385 rq->current_nr_sectors -= blocks;
2387 if (!tape->pc->error)
2388 idetape_end_request(drive, 1, 0);
2390 idetape_end_request(drive, tape->pc->error, 0);
2394 static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2396 idetape_init_pc(pc);
2397 pc->c[0] = IDETAPE_READ_CMD;
2398 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2400 pc->callback = &idetape_rw_callback;
2402 atomic_set(&bh->b_count, 0);
2404 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2405 if (pc->request_transfer == tape->stage_size)
2406 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2409 static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2412 struct idetape_bh *p = bh;
2414 idetape_init_pc(pc);
2415 pc->c[0] = IDETAPE_READ_BUFFER_CMD;
2416 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
2417 pc->c[7] = size >> 8;
2418 pc->c[8] = size & 0xff;
2419 pc->callback = &idetape_pc_callback;
2421 atomic_set(&bh->b_count, 0);
2424 atomic_set(&p->b_count, 0);
2427 pc->request_transfer = pc->buffer_size = size;
2430 static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2432 idetape_init_pc(pc);
2433 pc->c[0] = IDETAPE_WRITE_CMD;
2434 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2436 pc->callback = &idetape_rw_callback;
2437 set_bit(PC_WRITING, &pc->flags);
2439 pc->b_data = bh->b_data;
2440 pc->b_count = atomic_read(&bh->b_count);
2442 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2443 if (pc->request_transfer == tape->stage_size)
2444 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2448 * idetape_do_request is our request handling function.
2450 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
2451 struct request *rq, sector_t block)
2453 idetape_tape_t *tape = drive->driver_data;
2454 idetape_pc_t *pc = NULL;
2455 struct request *postponed_rq = tape->postponed_rq;
2456 atapi_status_t status;
2458 #if IDETAPE_DEBUG_LOG
2460 if (tape->debug_level >= 5)
2461 printk(KERN_INFO "ide-tape: rq_status: %d, "
2462 "dev: %s, cmd: %ld, errors: %d\n", rq->rq_status,
2463 rq->rq_disk->disk_name, rq->cmd[0], rq->errors);
2465 if (tape->debug_level >= 2)
2466 printk(KERN_INFO "ide-tape: sector: %ld, "
2467 "nr_sectors: %ld, current_nr_sectors: %d\n",
2468 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
2469 #endif /* IDETAPE_DEBUG_LOG */
2471 if ((rq->flags & REQ_SPECIAL) == 0) {
2473 * We do not support buffer cache originated requests.
2475 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
2476 "request queue (%ld)\n", drive->name, rq->flags);
2477 ide_end_request(drive, 0, 0);
2482 * Retry a failed packet command
2484 if (tape->failed_pc != NULL &&
2485 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2486 return idetape_issue_packet_command(drive, tape->failed_pc);
2488 #if IDETAPE_DEBUG_BUGS
2489 if (postponed_rq != NULL)
2490 if (rq != postponed_rq) {
2491 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
2492 "Two DSC requests were queued\n");
2493 idetape_end_request(drive, 0, 0);
2496 #endif /* IDETAPE_DEBUG_BUGS */
2498 tape->postponed_rq = NULL;
2501 * If the tape is still busy, postpone our request and service
2502 * the other device meanwhile.
2504 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
2506 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
2507 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
2509 if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
2510 tape->measure_insert_time = 1;
2511 if (time_after(jiffies, tape->insert_time))
2512 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2513 calculate_speeds(drive);
2514 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
2516 if (postponed_rq == NULL) {
2517 tape->dsc_polling_start = jiffies;
2518 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
2519 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
2520 } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) {
2521 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
2523 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2524 idetape_media_access_finished(drive);
2527 return ide_do_reset(drive);
2529 } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD)
2530 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
2531 idetape_postpone_request(drive);
2534 if (rq->cmd[0] & REQ_IDETAPE_READ) {
2535 tape->buffer_head++;
2537 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
2539 tape->postpone_cnt = 0;
2540 pc = idetape_next_pc_storage(drive);
2541 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2544 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
2545 tape->buffer_head++;
2547 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
2549 tape->postpone_cnt = 0;
2550 pc = idetape_next_pc_storage(drive);
2551 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2554 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
2555 tape->postpone_cnt = 0;
2556 pc = idetape_next_pc_storage(drive);
2557 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2560 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
2561 pc = (idetape_pc_t *) rq->buffer;
2562 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
2563 rq->cmd[0] |= REQ_IDETAPE_PC2;
2566 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2567 idetape_media_access_finished(drive);
2572 return idetape_issue_packet_command(drive, pc);
2576 * Pipeline related functions
2578 static inline int idetape_pipeline_active (idetape_tape_t *tape)
2582 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2583 rc2 = (tape->active_data_request != NULL);
2588 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
2589 * stage, along with all the necessary small buffers which together make
2590 * a buffer of size tape->stage_size (or a bit more). We attempt to
2591 * combine sequential pages as much as possible.
2593 * Returns a pointer to the new allocated stage, or NULL if we
2594 * can't (or don't want to) allocate a stage.
2596 * Pipeline stages are optional and are used to increase performance.
2597 * If we can't allocate them, we'll manage without them.
2599 static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
2601 idetape_stage_t *stage;
2602 struct idetape_bh *prev_bh, *bh;
2603 int pages = tape->pages_per_stage;
2604 char *b_data = NULL;
2606 if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
2610 bh = stage->bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
2613 bh->b_reqnext = NULL;
2614 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2617 memset(bh->b_data, 0, PAGE_SIZE);
2618 bh->b_size = PAGE_SIZE;
2619 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2622 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2625 memset(b_data, 0, PAGE_SIZE);
2626 if (bh->b_data == b_data + PAGE_SIZE) {
2627 bh->b_size += PAGE_SIZE;
2628 bh->b_data -= PAGE_SIZE;
2630 atomic_add(PAGE_SIZE, &bh->b_count);
2633 if (b_data == bh->b_data + bh->b_size) {
2634 bh->b_size += PAGE_SIZE;
2636 atomic_add(PAGE_SIZE, &bh->b_count);
2640 if ((bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
2641 free_page((unsigned long) b_data);
2644 bh->b_reqnext = NULL;
2645 bh->b_data = b_data;
2646 bh->b_size = PAGE_SIZE;
2647 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2648 prev_bh->b_reqnext = bh;
2650 bh->b_size -= tape->excess_bh_size;
2652 atomic_sub(tape->excess_bh_size, &bh->b_count);
2655 __idetape_kfree_stage(stage);
2659 static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
2661 idetape_stage_t *cache_stage = tape->cache_stage;
2663 #if IDETAPE_DEBUG_LOG
2664 if (tape->debug_level >= 4)
2665 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
2666 #endif /* IDETAPE_DEBUG_LOG */
2668 if (tape->nr_stages >= tape->max_stages)
2670 if (cache_stage != NULL) {
2671 tape->cache_stage = NULL;
2674 return __idetape_kmalloc_stage(tape, 0, 0);
2677 static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
2679 struct idetape_bh *bh = tape->bh;
2683 #if IDETAPE_DEBUG_BUGS
2685 printk(KERN_ERR "ide-tape: bh == NULL in "
2686 "idetape_copy_stage_from_user\n");
2689 #endif /* IDETAPE_DEBUG_BUGS */
2690 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
2691 copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count);
2693 atomic_add(count, &bh->b_count);
2695 if (atomic_read(&bh->b_count) == bh->b_size) {
2698 atomic_set(&bh->b_count, 0);
2704 static void idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
2706 struct idetape_bh *bh = tape->bh;
2710 #if IDETAPE_DEBUG_BUGS
2712 printk(KERN_ERR "ide-tape: bh == NULL in "
2713 "idetape_copy_stage_to_user\n");
2716 #endif /* IDETAPE_DEBUG_BUGS */
2717 count = min(tape->b_count, n);
2718 copy_to_user(buf, tape->b_data, count);
2720 tape->b_data += count;
2721 tape->b_count -= count;
2723 if (!tape->b_count) {
2724 tape->bh = bh = bh->b_reqnext;
2726 tape->b_data = bh->b_data;
2727 tape->b_count = atomic_read(&bh->b_count);
2733 static void idetape_init_merge_stage (idetape_tape_t *tape)
2735 struct idetape_bh *bh = tape->merge_stage->bh;
2738 if (tape->chrdev_direction == idetape_direction_write)
2739 atomic_set(&bh->b_count, 0);
2741 tape->b_data = bh->b_data;
2742 tape->b_count = atomic_read(&bh->b_count);
2746 static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
2748 struct idetape_bh *tmp;
2751 stage->bh = tape->merge_stage->bh;
2752 tape->merge_stage->bh = tmp;
2753 idetape_init_merge_stage(tape);
2757 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2759 static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
2761 idetape_tape_t *tape = drive->driver_data;
2762 unsigned long flags;
2764 #if IDETAPE_DEBUG_LOG
2765 if (tape->debug_level >= 4)
2766 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
2767 #endif /* IDETAPE_DEBUG_LOG */
2768 spin_lock_irqsave(&tape->spinlock, flags);
2770 if (tape->last_stage != NULL)
2771 tape->last_stage->next=stage;
2773 tape->first_stage = tape->next_stage=stage;
2774 tape->last_stage = stage;
2775 if (tape->next_stage == NULL)
2776 tape->next_stage = tape->last_stage;
2778 tape->nr_pending_stages++;
2779 spin_unlock_irqrestore(&tape->spinlock, flags);
2783 * idetape_wait_for_request installs a completion in a pending request
2784 * and sleeps until it is serviced.
2786 * The caller should ensure that the request will not be serviced
2787 * before we install the completion (usually by disabling interrupts).
2789 static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
2791 DECLARE_COMPLETION(wait);
2792 idetape_tape_t *tape = drive->driver_data;
2794 #if IDETAPE_DEBUG_BUGS
2795 if (rq == NULL || (rq->flags & REQ_SPECIAL) == 0) {
2796 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
2799 #endif /* IDETAPE_DEBUG_BUGS */
2800 rq->waiting = &wait;
2801 spin_unlock_irq(&tape->spinlock);
2802 wait_for_completion(&wait);
2803 /* The stage and its struct request have been deallocated */
2804 spin_lock_irq(&tape->spinlock);
2807 static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
2809 idetape_tape_t *tape = drive->driver_data;
2810 idetape_read_position_result_t *result;
2812 #if IDETAPE_DEBUG_LOG
2813 if (tape->debug_level >= 4)
2814 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
2815 #endif /* IDETAPE_DEBUG_LOG */
2817 if (!tape->pc->error) {
2818 result = (idetape_read_position_result_t *) tape->pc->buffer;
2819 #if IDETAPE_DEBUG_LOG
2820 if (tape->debug_level >= 2)
2821 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
2822 if (tape->debug_level >= 2)
2823 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
2824 #endif /* IDETAPE_DEBUG_LOG */
2826 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
2827 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2828 idetape_end_request(drive, 0, 0);
2830 #if IDETAPE_DEBUG_LOG
2831 if (tape->debug_level >= 2)
2832 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
2833 #endif /* IDETAPE_DEBUG_LOG */
2834 tape->partition = result->partition;
2835 tape->first_frame_position = ntohl(result->first_block);
2836 tape->last_frame_position = ntohl(result->last_block);
2837 tape->blocks_in_buffer = result->blocks_in_buffer[2];
2838 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2839 idetape_end_request(drive, 1, 0);
2842 idetape_end_request(drive, 0, 0);
2848 * idetape_create_write_filemark_cmd will:
2850 * 1. Write a filemark if write_filemark=1.
2851 * 2. Flush the device buffers without writing a filemark
2852 * if write_filemark=0.
2855 static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2857 idetape_init_pc(pc);
2858 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
2859 pc->c[4] = write_filemark;
2860 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2861 pc->callback = &idetape_pc_callback;
2864 static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2866 idetape_init_pc(pc);
2867 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
2868 pc->callback = &idetape_pc_callback;
2872 * idetape_queue_pc_tail is based on the following functions:
2874 * ide_do_drive_cmd from ide.c
2875 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2877 * We add a special packet command request to the tail of the request
2878 * queue, and wait for it to be serviced.
2880 * This is not to be called from within the request handling part
2881 * of the driver ! We allocate here data in the stack, and it is valid
2882 * until the request is finished. This is not the case for the bottom
2883 * part of the driver, where we are always leaving the functions to wait
2884 * for an interrupt or a timer event.
2886 * From the bottom part of the driver, we should allocate safe memory
2887 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2888 * the request to the request list without waiting for it to be serviced !
2889 * In that case, we usually use idetape_queue_pc_head.
2891 static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2895 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2896 rq.buffer = (char *) pc;
2897 return ide_do_drive_cmd(drive, &rq, ide_wait);
2900 static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2902 idetape_init_pc(pc);
2903 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
2905 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2906 pc->callback = &idetape_pc_callback;
2909 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2911 idetape_tape_t *tape = drive->driver_data;
2913 int load_attempted = 0;
2916 * Wait for the tape to become ready
2918 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2920 while (time_before(jiffies, timeout)) {
2921 idetape_create_test_unit_ready_cmd(&pc);
2922 if (!__idetape_queue_pc_tail(drive, &pc))
2924 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2925 || (tape->asc == 0x3A)) { /* no media */
2928 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2929 __idetape_queue_pc_tail(drive, &pc);
2931 /* not about to be ready */
2932 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2933 (tape->ascq == 1 || tape->ascq == 8)))
2935 current->state = TASK_INTERRUPTIBLE;
2936 schedule_timeout(HZ / 10);
2941 static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2943 return __idetape_queue_pc_tail(drive, pc);
2946 static int idetape_flush_tape_buffers (ide_drive_t *drive)
2951 idetape_create_write_filemark_cmd(drive, &pc, 0);
2952 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2954 idetape_wait_ready(drive, 60 * 5 * HZ);
2958 static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2960 idetape_init_pc(pc);
2961 pc->c[0] = IDETAPE_READ_POSITION_CMD;
2962 pc->request_transfer = 20;
2963 pc->callback = &idetape_read_position_callback;
2966 static int idetape_read_position (ide_drive_t *drive)
2968 idetape_tape_t *tape = drive->driver_data;
2972 #if IDETAPE_DEBUG_LOG
2973 if (tape->debug_level >= 4)
2974 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
2975 #endif /* IDETAPE_DEBUG_LOG */
2977 idetape_create_read_position_cmd(&pc);
2978 if (idetape_queue_pc_tail(drive, &pc))
2980 position = tape->first_frame_position;
2984 static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2986 idetape_init_pc(pc);
2987 pc->c[0] = IDETAPE_LOCATE_CMD;
2989 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]);
2990 pc->c[8] = partition;
2991 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2992 pc->callback = &idetape_pc_callback;
2995 static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2997 idetape_tape_t *tape = drive->driver_data;
2999 if (!tape->capabilities.lock)
3002 idetape_init_pc(pc);
3003 pc->c[0] = IDETAPE_PREVENT_CMD;
3005 pc->callback = &idetape_pc_callback;
3009 static int __idetape_discard_read_pipeline (ide_drive_t *drive)
3011 idetape_tape_t *tape = drive->driver_data;
3012 unsigned long flags;
3015 if (tape->chrdev_direction != idetape_direction_read)
3018 /* Remove merge stage. */
3019 cnt = tape->merge_stage_size / tape->tape_block_size;
3020 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
3021 ++cnt; /* Filemarks count as 1 sector */
3022 tape->merge_stage_size = 0;
3023 if (tape->merge_stage != NULL) {
3024 __idetape_kfree_stage(tape->merge_stage);
3025 tape->merge_stage = NULL;
3028 /* Clear pipeline flags. */
3029 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3030 tape->chrdev_direction = idetape_direction_none;
3032 /* Remove pipeline stages. */
3033 if (tape->first_stage == NULL)
3036 spin_lock_irqsave(&tape->spinlock, flags);
3037 tape->next_stage = NULL;
3038 if (idetape_pipeline_active(tape))
3039 idetape_wait_for_request(drive, tape->active_data_request);
3040 spin_unlock_irqrestore(&tape->spinlock, flags);
3042 while (tape->first_stage != NULL) {
3043 struct request *rq_ptr = &tape->first_stage->rq;
3045 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
3046 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3048 idetape_remove_stage_head(drive);
3050 tape->nr_pending_stages = 0;
3051 tape->max_stages = tape->min_pipeline;
3056 * idetape_position_tape positions the tape to the requested block
3057 * using the LOCATE packet command. A READ POSITION command is then
3058 * issued to check where we are positioned.
3060 * Like all higher level operations, we queue the commands at the tail
3061 * of the request queue and wait for their completion.
3064 static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
3066 idetape_tape_t *tape = drive->driver_data;
3070 if (tape->chrdev_direction == idetape_direction_read)
3071 __idetape_discard_read_pipeline(drive);
3072 idetape_wait_ready(drive, 60 * 5 * HZ);
3073 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
3074 retval = idetape_queue_pc_tail(drive, &pc);
3078 idetape_create_read_position_cmd(&pc);
3079 return (idetape_queue_pc_tail(drive, &pc));
3082 static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
3084 idetape_tape_t *tape = drive->driver_data;
3088 cnt = __idetape_discard_read_pipeline(drive);
3089 if (restore_position) {
3090 position = idetape_read_position(drive);
3091 seek = position > cnt ? position - cnt : 0;
3092 if (idetape_position_tape(drive, seek, 0, 0)) {
3093 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
3100 * idetape_queue_rw_tail generates a read/write request for the block
3101 * device interface and wait for it to be serviced.
3103 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
3105 idetape_tape_t *tape = drive->driver_data;
3108 #if IDETAPE_DEBUG_LOG
3109 if (tape->debug_level >= 2)
3110 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
3111 #endif /* IDETAPE_DEBUG_LOG */
3112 #if IDETAPE_DEBUG_BUGS
3113 if (idetape_pipeline_active(tape)) {
3114 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
3117 #endif /* IDETAPE_DEBUG_BUGS */
3119 idetape_init_rq(&rq, cmd);
3120 rq.special = (void *)bh;
3121 rq.sector = tape->first_frame_position;
3122 rq.nr_sectors = rq.current_nr_sectors = blocks;
3123 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
3125 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
3128 if (tape->merge_stage)
3129 idetape_init_merge_stage(tape);
3130 if (rq.errors == IDETAPE_ERROR_GENERAL)
3132 return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
3136 * idetape_insert_pipeline_into_queue is used to start servicing the
3137 * pipeline stages, starting from tape->next_stage.
3139 static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
3141 idetape_tape_t *tape = drive->driver_data;
3143 if (tape->next_stage == NULL)
3145 if (!idetape_pipeline_active(tape)) {
3146 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
3147 idetape_active_next_stage(drive);
3148 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
3152 static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
3154 idetape_init_pc(pc);
3155 pc->c[0] = IDETAPE_INQUIRY_CMD;
3156 pc->c[4] = pc->request_transfer = 254;
3157 pc->callback = &idetape_pc_callback;
3160 static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
3162 idetape_init_pc(pc);
3163 pc->c[0] = IDETAPE_REWIND_CMD;
3164 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3165 pc->callback = &idetape_pc_callback;
3169 static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length)
3171 idetape_init_pc(pc);
3172 set_bit(PC_WRITING, &pc->flags);
3173 pc->c[0] = IDETAPE_MODE_SELECT_CMD;
3175 put_unaligned(htons(length), (unsigned short *) &pc->c[3]);
3176 pc->request_transfer = 255;
3177 pc->callback = &idetape_pc_callback;
3181 static void idetape_create_erase_cmd (idetape_pc_t *pc)
3183 idetape_init_pc(pc);
3184 pc->c[0] = IDETAPE_ERASE_CMD;
3186 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3187 pc->callback = &idetape_pc_callback;
3190 static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
3192 idetape_init_pc(pc);
3193 pc->c[0] = IDETAPE_SPACE_CMD;
3194 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]);
3196 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3197 pc->callback = &idetape_pc_callback;
3200 static void idetape_wait_first_stage (ide_drive_t *drive)
3202 idetape_tape_t *tape = drive->driver_data;
3203 unsigned long flags;
3205 if (tape->first_stage == NULL)
3207 spin_lock_irqsave(&tape->spinlock, flags);
3208 if (tape->active_stage == tape->first_stage)
3209 idetape_wait_for_request(drive, tape->active_data_request);
3210 spin_unlock_irqrestore(&tape->spinlock, flags);
3214 * idetape_add_chrdev_write_request tries to add a character device
3215 * originated write request to our pipeline. In case we don't succeed,
3216 * we revert to non-pipelined operation mode for this request.
3218 * 1. Try to allocate a new pipeline stage.
3219 * 2. If we can't, wait for more and more requests to be serviced
3220 * and try again each time.
3221 * 3. If we still can't allocate a stage, fallback to
3222 * non-pipelined operation mode for this request.
3224 static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
3226 idetape_tape_t *tape = drive->driver_data;
3227 idetape_stage_t *new_stage;
3228 unsigned long flags;
3231 #if IDETAPE_DEBUG_LOG
3232 if (tape->debug_level >= 3)
3233 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
3234 #endif /* IDETAPE_DEBUG_LOG */
3237 * Attempt to allocate a new stage.
3238 * Pay special attention to possible race conditions.
3240 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
3241 spin_lock_irqsave(&tape->spinlock, flags);
3242 if (idetape_pipeline_active(tape)) {
3243 idetape_wait_for_request(drive, tape->active_data_request);
3244 spin_unlock_irqrestore(&tape->spinlock, flags);
3246 spin_unlock_irqrestore(&tape->spinlock, flags);
3247 idetape_insert_pipeline_into_queue(drive);
3248 if (idetape_pipeline_active(tape))
3251 * Linux is short on memory. Fallback to
3252 * non-pipelined operation mode for this request.
3254 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3257 rq = &new_stage->rq;
3258 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
3259 /* Doesn't actually matter - We always assume sequential access */
3260 rq->sector = tape->first_frame_position;
3261 rq->nr_sectors = rq->current_nr_sectors = blocks;
3263 idetape_switch_buffers(tape, new_stage);
3264 idetape_add_stage_tail(drive, new_stage);
3265 tape->pipeline_head++;
3267 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
3269 calculate_speeds(drive);
3272 * Estimate whether the tape has stopped writing by checking
3273 * if our write pipeline is currently empty. If we are not
3274 * writing anymore, wait for the pipeline to be full enough
3275 * (90%) before starting to service requests, so that we will
3276 * be able to keep up with the higher speeds of the tape.
3278 if (!idetape_pipeline_active(tape)) {
3279 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
3280 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
3281 tape->measure_insert_time = 1;
3282 tape->insert_time = jiffies;
3283 tape->insert_size = 0;
3284 tape->insert_speed = 0;
3285 idetape_insert_pipeline_into_queue(drive);
3288 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3289 /* Return a deferred error */
3295 * idetape_wait_for_pipeline will wait until all pending pipeline
3296 * requests are serviced. Typically called on device close.
3298 static void idetape_wait_for_pipeline (ide_drive_t *drive)
3300 idetape_tape_t *tape = drive->driver_data;
3301 unsigned long flags;
3303 while (tape->next_stage || idetape_pipeline_active(tape)) {
3304 idetape_insert_pipeline_into_queue(drive);
3305 spin_lock_irqsave(&tape->spinlock, flags);
3306 if (idetape_pipeline_active(tape))
3307 idetape_wait_for_request(drive, tape->active_data_request);
3308 spin_unlock_irqrestore(&tape->spinlock, flags);
3312 static void idetape_empty_write_pipeline (ide_drive_t *drive)
3314 idetape_tape_t *tape = drive->driver_data;
3316 struct idetape_bh *bh;
3318 #if IDETAPE_DEBUG_BUGS
3319 if (tape->chrdev_direction != idetape_direction_write) {
3320 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
3323 if (tape->merge_stage_size > tape->stage_size) {
3324 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
3325 tape->merge_stage_size = tape->stage_size;
3327 #endif /* IDETAPE_DEBUG_BUGS */
3328 if (tape->merge_stage_size) {
3329 blocks = tape->merge_stage_size / tape->tape_block_size;
3330 if (tape->merge_stage_size % tape->tape_block_size) {
3334 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
3335 bh = tape->bh->b_reqnext;
3337 atomic_set(&bh->b_count, 0);
3344 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
3347 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
3348 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
3349 atomic_add(min, &bh->b_count);
3354 (void) idetape_add_chrdev_write_request(drive, blocks);
3355 tape->merge_stage_size = 0;
3357 idetape_wait_for_pipeline(drive);
3358 if (tape->merge_stage != NULL) {
3359 __idetape_kfree_stage(tape->merge_stage);
3360 tape->merge_stage = NULL;
3362 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3363 tape->chrdev_direction = idetape_direction_none;
3366 * On the next backup, perform the feedback loop again.
3367 * (I don't want to keep sense information between backups,
3368 * as some systems are constantly on, and the system load
3369 * can be totally different on the next backup).
3371 tape->max_stages = tape->min_pipeline;
3372 #if IDETAPE_DEBUG_BUGS
3373 if (tape->first_stage != NULL ||
3374 tape->next_stage != NULL ||
3375 tape->last_stage != NULL ||
3376 tape->nr_stages != 0) {
3377 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
3378 "first_stage %p, next_stage %p, "
3379 "last_stage %p, nr_stages %d\n",
3380 tape->first_stage, tape->next_stage,
3381 tape->last_stage, tape->nr_stages);
3383 #endif /* IDETAPE_DEBUG_BUGS */
3386 static void idetape_restart_speed_control (ide_drive_t *drive)
3388 idetape_tape_t *tape = drive->driver_data;
3390 tape->restart_speed_control_req = 0;
3391 tape->pipeline_head = 0;
3392 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
3393 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
3394 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
3395 tape->uncontrolled_pipeline_head_speed = 0;
3396 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
3397 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
3400 static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
3402 idetape_tape_t *tape = drive->driver_data;
3403 idetape_stage_t *new_stage;
3406 int blocks = tape->capabilities.ctl;
3408 /* Initialize read operation */
3409 if (tape->chrdev_direction != idetape_direction_read) {
3410 if (tape->chrdev_direction == idetape_direction_write) {
3411 idetape_empty_write_pipeline(drive);
3412 idetape_flush_tape_buffers(drive);
3414 #if IDETAPE_DEBUG_BUGS
3415 if (tape->merge_stage || tape->merge_stage_size) {
3416 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
3417 tape->merge_stage_size = 0;
3419 #endif /* IDETAPE_DEBUG_BUGS */
3420 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3422 tape->chrdev_direction = idetape_direction_read;
3425 * Issue a read 0 command to ensure that DSC handshake
3426 * is switched from completion mode to buffer available
3428 * No point in issuing this if DSC overlap isn't supported,
3429 * some drives (Seagate STT3401A) will return an error.
3431 if (drive->dsc_overlap) {
3432 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
3433 if (bytes_read < 0) {
3434 __idetape_kfree_stage(tape->merge_stage);
3435 tape->merge_stage = NULL;
3436 tape->chrdev_direction = idetape_direction_none;
3441 if (tape->restart_speed_control_req)
3442 idetape_restart_speed_control(drive);
3443 idetape_init_rq(&rq, REQ_IDETAPE_READ);
3444 rq.sector = tape->first_frame_position;
3445 rq.nr_sectors = rq.current_nr_sectors = blocks;
3446 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
3447 tape->nr_stages < max_stages) {
3448 new_stage = idetape_kmalloc_stage(tape);
3449 while (new_stage != NULL) {
3451 idetape_add_stage_tail(drive, new_stage);
3452 if (tape->nr_stages >= max_stages)
3454 new_stage = idetape_kmalloc_stage(tape);
3457 if (!idetape_pipeline_active(tape)) {
3458 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
3459 tape->measure_insert_time = 1;
3460 tape->insert_time = jiffies;
3461 tape->insert_size = 0;
3462 tape->insert_speed = 0;
3463 idetape_insert_pipeline_into_queue(drive);
3470 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
3471 * to service a character device read request and add read-ahead
3472 * requests to our pipeline.
3474 static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
3476 idetape_tape_t *tape = drive->driver_data;
3477 unsigned long flags;
3478 struct request *rq_ptr;
3481 #if IDETAPE_DEBUG_LOG
3482 if (tape->debug_level >= 4)
3483 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
3484 #endif /* IDETAPE_DEBUG_LOG */
3487 * If we are at a filemark, return a read length of 0
3489 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
3493 * Wait for the next block to be available at the head
3496 idetape_initiate_read(drive, tape->max_stages);
3497 if (tape->first_stage == NULL) {
3498 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3500 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
3502 idetape_wait_first_stage(drive);
3503 rq_ptr = &tape->first_stage->rq;
3504 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
3505 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
3508 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
3511 idetape_switch_buffers(tape, tape->first_stage);
3512 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3513 set_bit(IDETAPE_FILEMARK, &tape->flags);
3514 spin_lock_irqsave(&tape->spinlock, flags);
3515 idetape_remove_stage_head(drive);
3516 spin_unlock_irqrestore(&tape->spinlock, flags);
3517 tape->pipeline_head++;
3519 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
3521 calculate_speeds(drive);
3523 #if IDETAPE_DEBUG_BUGS
3524 if (bytes_read > blocks * tape->tape_block_size) {
3525 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
3526 bytes_read = blocks * tape->tape_block_size;
3528 #endif /* IDETAPE_DEBUG_BUGS */
3529 return (bytes_read);
3532 static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
3534 idetape_tape_t *tape = drive->driver_data;
3535 struct idetape_bh *bh;
3541 bh = tape->merge_stage->bh;
3542 count = min(tape->stage_size, bcount);
3544 blocks = count / tape->tape_block_size;
3546 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
3547 memset(bh->b_data, 0, atomic_read(&bh->b_count));
3548 count -= atomic_read(&bh->b_count);
3551 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3555 static int idetape_pipeline_size (ide_drive_t *drive)
3557 idetape_tape_t *tape = drive->driver_data;
3558 idetape_stage_t *stage;
3562 idetape_wait_for_pipeline(drive);
3563 stage = tape->first_stage;
3564 while (stage != NULL) {
3566 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
3567 if (rq->errors == IDETAPE_ERROR_FILEMARK)
3568 size += tape->tape_block_size;
3569 stage = stage->next;
3571 size += tape->merge_stage_size;
3576 * Rewinds the tape to the Beginning Of the current Partition (BOP).
3578 * We currently support only one partition.
3580 static int idetape_rewind_tape (ide_drive_t *drive)
3584 #if IDETAPE_DEBUG_LOG
3585 idetape_tape_t *tape = drive->driver_data;
3586 if (tape->debug_level >= 2)
3587 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
3588 #endif /* IDETAPE_DEBUG_LOG */
3590 idetape_create_rewind_cmd(drive, &pc);
3591 retval = idetape_queue_pc_tail(drive, &pc);
3595 idetape_create_read_position_cmd(&pc);
3596 retval = idetape_queue_pc_tail(drive, &pc);
3603 * Our special ide-tape ioctl's.
3605 * Currently there aren't any ioctl's.
3606 * mtio.h compatible commands should be issued to the character device
3609 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
3611 idetape_tape_t *tape = drive->driver_data;
3612 idetape_config_t config;
3613 void __user *argp = (void __user *)arg;
3615 #if IDETAPE_DEBUG_LOG
3616 if (tape->debug_level >= 4)
3617 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
3618 #endif /* IDETAPE_DEBUG_LOG */
3621 if (copy_from_user(&config, argp, sizeof (idetape_config_t)))
3623 tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
3624 tape->max_stages = config.nr_stages;
3627 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
3628 config.nr_stages = tape->max_stages;
3629 if (copy_to_user(argp, &config, sizeof (idetape_config_t)))
3639 * idetape_pre_reset is called before an ATAPI/ATA software reset.
3641 static void idetape_pre_reset (ide_drive_t *drive)
3643 idetape_tape_t *tape = drive->driver_data;
3645 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
3649 * idetape_space_over_filemarks is now a bit more complicated than just
3650 * passing the command to the tape since we may have crossed some
3651 * filemarks during our pipelined read-ahead mode.
3653 * As a minor side effect, the pipeline enables us to support MTFSFM when
3654 * the filemark is in our internal pipeline even if the tape doesn't
3655 * support spacing over filemarks in the reverse direction.
3657 static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
3659 idetape_tape_t *tape = drive->driver_data;
3661 unsigned long flags;
3666 if (MTBSF == mt_op || MTBSFM == mt_op) {
3667 if (!tape->capabilities.sprev)
3669 mt_count = - mt_count;
3672 if (tape->chrdev_direction == idetape_direction_read) {
3674 * We have a read-ahead buffer. Scan it for crossed
3677 tape->merge_stage_size = 0;
3678 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
3680 while (tape->first_stage != NULL) {
3681 if (count == mt_count) {
3682 if (mt_op == MTFSFM)
3683 set_bit(IDETAPE_FILEMARK, &tape->flags);
3686 spin_lock_irqsave(&tape->spinlock, flags);
3687 if (tape->first_stage == tape->active_stage) {
3689 * We have reached the active stage in the read pipeline.
3690 * There is no point in allowing the drive to continue
3691 * reading any farther, so we stop the pipeline.
3693 * This section should be moved to a separate subroutine,
3694 * because a similar function is performed in
3695 * __idetape_discard_read_pipeline(), for example.
3697 tape->next_stage = NULL;
3698 spin_unlock_irqrestore(&tape->spinlock, flags);
3699 idetape_wait_first_stage(drive);
3700 tape->next_stage = tape->first_stage->next;
3702 spin_unlock_irqrestore(&tape->spinlock, flags);
3703 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
3705 idetape_remove_stage_head(drive);
3707 idetape_discard_read_pipeline(drive, 0);
3711 * The filemark was not found in our internal pipeline.
3712 * Now we can issue the space command.
3717 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
3718 return (idetape_queue_pc_tail(drive, &pc));
3721 if (!tape->capabilities.sprev)
3723 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
3724 if (retval) return (retval);
3725 count = (MTBSFM == mt_op ? 1 : -1);
3726 return (idetape_space_over_filemarks(drive, MTFSF, count));
3728 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
3735 * Our character device read / write functions.
3737 * The tape is optimized to maximize throughput when it is transferring
3738 * an integral number of the "continuous transfer limit", which is
3739 * a parameter of the specific tape (26 KB on my particular tape).
3740 * (32 kB for Onstream)
3742 * As of version 1.3 of the driver, the character device provides an
3743 * abstract continuous view of the media - any mix of block sizes (even 1
3744 * byte) on the same backup/restore procedure is supported. The driver
3745 * will internally convert the requests to the recommended transfer unit,
3746 * so that an unmatch between the user's block size to the recommended
3747 * size will only result in a (slightly) increased driver overhead, but
3748 * will no longer hit performance.
3749 * This is not applicable to Onstream.
3751 static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
3752 size_t count, loff_t *ppos)
3754 ide_drive_t *drive = file->private_data;
3755 idetape_tape_t *tape = drive->driver_data;
3756 ssize_t bytes_read,temp, actually_read = 0, rc;
3758 if (ppos != &file->f_pos) {
3759 /* "A request was outside the capabilities of the device." */
3762 #if IDETAPE_DEBUG_LOG
3763 if (tape->debug_level >= 3)
3764 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
3765 #endif /* IDETAPE_DEBUG_LOG */
3767 if (tape->chrdev_direction != idetape_direction_read) {
3768 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
3769 if (count > tape->tape_block_size &&
3770 (count % tape->tape_block_size) == 0)
3771 tape->user_bs_factor = count / tape->tape_block_size;
3773 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
3777 if (tape->merge_stage_size) {
3778 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
3779 idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read);
3780 buf += actually_read;
3781 tape->merge_stage_size -= actually_read;
3782 count -= actually_read;
3784 while (count >= tape->stage_size) {
3785 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3786 if (bytes_read <= 0)
3788 idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read);
3790 count -= bytes_read;
3791 actually_read += bytes_read;
3794 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3795 if (bytes_read <= 0)
3797 temp = min((unsigned long)count, (unsigned long)bytes_read);
3798 idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp);
3799 actually_read += temp;
3800 tape->merge_stage_size = bytes_read-temp;
3803 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
3804 #if IDETAPE_DEBUG_LOG
3805 if (tape->debug_level >= 2)
3806 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
3808 idetape_space_over_filemarks(drive, MTFSF, 1);
3811 return actually_read;
3814 static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
3815 size_t count, loff_t *ppos)
3817 ide_drive_t *drive = file->private_data;
3818 idetape_tape_t *tape = drive->driver_data;
3819 ssize_t retval, actually_written = 0;
3821 if (ppos != &file->f_pos) {
3822 /* "A request was outside the capabilities of the device." */
3826 /* The drive is write protected. */
3827 if (tape->write_prot)
3830 #if IDETAPE_DEBUG_LOG
3831 if (tape->debug_level >= 3)
3832 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
3833 "count %Zd\n", count);
3834 #endif /* IDETAPE_DEBUG_LOG */
3836 /* Initialize write operation */
3837 if (tape->chrdev_direction != idetape_direction_write) {
3838 if (tape->chrdev_direction == idetape_direction_read)
3839 idetape_discard_read_pipeline(drive, 1);
3840 #if IDETAPE_DEBUG_BUGS
3841 if (tape->merge_stage || tape->merge_stage_size) {
3842 printk(KERN_ERR "ide-tape: merge_stage_size "
3843 "should be 0 now\n");
3844 tape->merge_stage_size = 0;
3846 #endif /* IDETAPE_DEBUG_BUGS */
3847 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3849 tape->chrdev_direction = idetape_direction_write;
3850 idetape_init_merge_stage(tape);
3853 * Issue a write 0 command to ensure that DSC handshake
3854 * is switched from completion mode to buffer available
3856 * No point in issuing this if DSC overlap isn't supported,
3857 * some drives (Seagate STT3401A) will return an error.
3859 if (drive->dsc_overlap) {
3860 retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
3862 __idetape_kfree_stage(tape->merge_stage);
3863 tape->merge_stage = NULL;
3864 tape->chrdev_direction = idetape_direction_none;
3871 if (tape->restart_speed_control_req)
3872 idetape_restart_speed_control(drive);
3873 if (tape->merge_stage_size) {
3874 #if IDETAPE_DEBUG_BUGS
3875 if (tape->merge_stage_size >= tape->stage_size) {
3876 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
3877 tape->merge_stage_size = 0;
3879 #endif /* IDETAPE_DEBUG_BUGS */
3880 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
3881 idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written);
3882 buf += actually_written;
3883 tape->merge_stage_size += actually_written;
3884 count -= actually_written;
3886 if (tape->merge_stage_size == tape->stage_size) {
3887 tape->merge_stage_size = 0;
3888 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3893 while (count >= tape->stage_size) {
3894 idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size);
3895 buf += tape->stage_size;
3896 count -= tape->stage_size;
3897 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3898 actually_written += tape->stage_size;
3903 actually_written += count;
3904 idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count);
3905 tape->merge_stage_size += count;
3907 return (actually_written);
3910 static int idetape_write_filemark (ide_drive_t *drive)
3914 /* Write a filemark */
3915 idetape_create_write_filemark_cmd(drive, &pc, 1);
3916 if (idetape_queue_pc_tail(drive, &pc)) {
3917 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3924 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3925 * the general mtio MTIOCTOP ioctl is requested.
3927 * We currently support the following mtio.h operations:
3929 * MTFSF - Space over mt_count filemarks in the positive direction.
3930 * The tape is positioned after the last spaced filemark.
3932 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3935 * MTBSF - Steps background over mt_count filemarks, tape is
3936 * positioned before the last filemark.
3938 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3942 * MTBSF and MTBSFM are not supported when the tape doesn't
3943 * support spacing over filemarks in the reverse direction.
3944 * In this case, MTFSFM is also usually not supported (it is
3945 * supported in the rare case in which we crossed the filemark
3946 * during our read-ahead pipelined operation mode).
3948 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3949 * the last written filemark.
3951 * MTREW - Rewinds tape.
3953 * MTLOAD - Loads the tape.
3955 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3956 * MTUNLOAD prevents further access until the media is replaced.
3958 * MTNOP - Flushes tape buffers.
3960 * MTRETEN - Retension media. This typically consists of one end
3961 * to end pass on the media.
3963 * MTEOM - Moves to the end of recorded data.
3965 * MTERASE - Erases tape.
3967 * MTSETBLK - Sets the user block size to mt_count bytes. If
3968 * mt_count is 0, we will attempt to autodetect
3971 * MTSEEK - Positions the tape in a specific block number, where
3972 * each block is assumed to contain which user_block_size
3975 * MTSETPART - Switches to another tape partition.
3977 * MTLOCK - Locks the tape door.
3979 * MTUNLOCK - Unlocks the tape door.
3981 * The following commands are currently not supported:
3983 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3984 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3986 static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
3988 idetape_tape_t *tape = drive->driver_data;
3992 #if IDETAPE_DEBUG_LOG
3993 if (tape->debug_level >= 1)
3994 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
3995 "mt_op=%d, mt_count=%d\n", mt_op, mt_count);
3996 #endif /* IDETAPE_DEBUG_LOG */
3998 * Commands which need our pipelined read-ahead stages.
4007 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
4013 if (tape->write_prot)
4015 idetape_discard_read_pipeline(drive, 1);
4016 for (i = 0; i < mt_count; i++) {
4017 retval = idetape_write_filemark(drive);
4023 idetape_discard_read_pipeline(drive, 0);
4024 if (idetape_rewind_tape(drive))
4028 idetape_discard_read_pipeline(drive, 0);
4029 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
4030 return (idetape_queue_pc_tail(drive, &pc));
4034 * If door is locked, attempt to unlock before
4035 * attempting to eject.
4037 if (tape->door_locked) {
4038 if (idetape_create_prevent_cmd(drive, &pc, 0))
4039 if (!idetape_queue_pc_tail(drive, &pc))
4040 tape->door_locked = DOOR_UNLOCKED;
4042 idetape_discard_read_pipeline(drive, 0);
4043 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
4044 retval = idetape_queue_pc_tail(drive, &pc);
4046 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
4049 idetape_discard_read_pipeline(drive, 0);
4050 return (idetape_flush_tape_buffers(drive));
4052 idetape_discard_read_pipeline(drive, 0);
4053 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
4054 return (idetape_queue_pc_tail(drive, &pc));
4056 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
4057 return (idetape_queue_pc_tail(drive, &pc));
4059 (void) idetape_rewind_tape(drive);
4060 idetape_create_erase_cmd(&pc);
4061 return (idetape_queue_pc_tail(drive, &pc));
4064 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
4066 tape->user_bs_factor = mt_count / tape->tape_block_size;
4067 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
4069 set_bit(IDETAPE_DETECT_BS, &tape->flags);
4072 idetape_discard_read_pipeline(drive, 0);
4073 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
4075 idetape_discard_read_pipeline(drive, 0);
4076 return (idetape_position_tape(drive, 0, mt_count, 0));
4080 if (!idetape_create_prevent_cmd(drive, &pc, 1))
4082 retval = idetape_queue_pc_tail(drive, &pc);
4083 if (retval) return retval;
4084 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
4087 if (!idetape_create_prevent_cmd(drive, &pc, 0))
4089 retval = idetape_queue_pc_tail(drive, &pc);
4090 if (retval) return retval;
4091 tape->door_locked = DOOR_UNLOCKED;
4094 printk(KERN_ERR "ide-tape: MTIO operation %d not "
4095 "supported\n", mt_op);
4101 * Our character device ioctls.
4103 * General mtio.h magnetic io commands are supported here, and not in
4104 * the corresponding block interface.
4106 * The following ioctls are supported:
4108 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
4110 * MTIOCGET - The mt_dsreg field in the returned mtget structure
4111 * will be set to (user block size in bytes <<
4112 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
4114 * The mt_blkno is set to the current user block number.
4115 * The other mtget fields are not supported.
4117 * MTIOCPOS - The current tape "block position" is returned. We
4118 * assume that each block contains user_block_size
4121 * Our own ide-tape ioctls are supported on both interfaces.
4123 static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
4125 ide_drive_t *drive = file->private_data;
4126 idetape_tape_t *tape = drive->driver_data;
4130 int block_offset = 0, position = tape->first_frame_position;
4131 void __user *argp = (void __user *)arg;
4133 #if IDETAPE_DEBUG_LOG
4134 if (tape->debug_level >= 3)
4135 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
4137 #endif /* IDETAPE_DEBUG_LOG */
4139 tape->restart_speed_control_req = 1;
4140 if (tape->chrdev_direction == idetape_direction_write) {
4141 idetape_empty_write_pipeline(drive);
4142 idetape_flush_tape_buffers(drive);
4144 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
4145 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
4146 if ((position = idetape_read_position(drive)) < 0)
4151 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
4153 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
4155 memset(&mtget, 0, sizeof (struct mtget));
4156 mtget.mt_type = MT_ISSCSI2;
4157 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
4158 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
4159 if (tape->drv_write_prot) {
4160 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
4162 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
4166 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
4167 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
4171 if (tape->chrdev_direction == idetape_direction_read)
4172 idetape_discard_read_pipeline(drive, 1);
4173 return idetape_blkdev_ioctl(drive, cmd, arg);
4177 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
4180 * Our character device open function.
4182 static int idetape_chrdev_open (struct inode *inode, struct file *filp)
4184 unsigned int minor = iminor(inode), i = minor & ~0xc0;
4186 idetape_tape_t *tape;
4190 #if IDETAPE_DEBUG_LOG
4191 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
4192 #endif /* IDETAPE_DEBUG_LOG */
4194 if (i >= MAX_HWIFS * MAX_DRIVES)
4196 drive = idetape_chrdevs[i].drive;
4197 tape = drive->driver_data;
4198 filp->private_data = drive;
4200 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags))
4202 retval = idetape_wait_ready(drive, 60 * HZ);
4204 clear_bit(IDETAPE_BUSY, &tape->flags);
4205 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
4209 idetape_read_position(drive);
4210 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
4211 (void)idetape_rewind_tape(drive);
4213 if (tape->chrdev_direction != idetape_direction_read)
4214 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
4216 /* Read block size and write protect status from drive. */
4217 idetape_get_blocksize_from_block_descriptor(drive);
4219 /* Set write protect flag if device is opened as read-only. */
4220 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
4221 tape->write_prot = 1;
4223 tape->write_prot = tape->drv_write_prot;
4225 /* Make sure drive isn't write protected if user wants to write. */
4226 if (tape->write_prot) {
4227 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
4228 (filp->f_flags & O_ACCMODE) == O_RDWR) {
4229 clear_bit(IDETAPE_BUSY, &tape->flags);
4235 * Lock the tape drive door so user can't eject.
4237 if (tape->chrdev_direction == idetape_direction_none) {
4238 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
4239 if (!idetape_queue_pc_tail(drive, &pc)) {
4240 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
4241 tape->door_locked = DOOR_LOCKED;
4245 idetape_restart_speed_control(drive);
4246 tape->restart_speed_control_req = 0;
4250 static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
4252 idetape_tape_t *tape = drive->driver_data;
4254 idetape_empty_write_pipeline(drive);
4255 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
4256 if (tape->merge_stage != NULL) {
4257 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
4258 __idetape_kfree_stage(tape->merge_stage);
4259 tape->merge_stage = NULL;
4261 idetape_write_filemark(drive);
4262 idetape_flush_tape_buffers(drive);
4263 idetape_flush_tape_buffers(drive);
4267 * Our character device release function.
4269 static int idetape_chrdev_release (struct inode *inode, struct file *filp)
4271 ide_drive_t *drive = filp->private_data;
4272 idetape_tape_t *tape;
4274 unsigned int minor = iminor(inode);
4277 tape = drive->driver_data;
4278 #if IDETAPE_DEBUG_LOG
4279 if (tape->debug_level >= 3)
4280 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
4281 #endif /* IDETAPE_DEBUG_LOG */
4283 if (tape->chrdev_direction == idetape_direction_write)
4284 idetape_write_release(drive, minor);
4285 if (tape->chrdev_direction == idetape_direction_read) {
4287 idetape_discard_read_pipeline(drive, 1);
4289 idetape_wait_for_pipeline(drive);
4291 if (tape->cache_stage != NULL) {
4292 __idetape_kfree_stage(tape->cache_stage);
4293 tape->cache_stage = NULL;
4295 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
4296 (void) idetape_rewind_tape(drive);
4297 if (tape->chrdev_direction == idetape_direction_none) {
4298 if (tape->door_locked == DOOR_LOCKED) {
4299 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
4300 if (!idetape_queue_pc_tail(drive, &pc))
4301 tape->door_locked = DOOR_UNLOCKED;
4305 clear_bit(IDETAPE_BUSY, &tape->flags);
4311 * idetape_identify_device is called to check the contents of the
4312 * ATAPI IDENTIFY command results. We return:
4314 * 1 If the tape can be supported by us, based on the information
4317 * 0 If this tape driver is not currently supported by us.
4319 static int idetape_identify_device (ide_drive_t *drive)
4321 struct idetape_id_gcw gcw;
4322 struct hd_driveid *id = drive->id;
4323 #if IDETAPE_DEBUG_INFO
4324 unsigned short mask,i;
4325 #endif /* IDETAPE_DEBUG_INFO */
4327 if (drive->id_read == 0)
4330 *((unsigned short *) &gcw) = id->config;
4332 #if IDETAPE_DEBUG_INFO
4333 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n");
4334 printk(KERN_INFO "ide-tape: Protocol Type: ");
4335 switch (gcw.protocol) {
4336 case 0: case 1: printk("ATA\n");break;
4337 case 2: printk("ATAPI\n");break;
4338 case 3: printk("Reserved (Unknown to ide-tape)\n");break;
4340 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type);
4341 switch (gcw.device_type) {
4342 case 0: printk("Direct-access Device\n");break;
4343 case 1: printk("Streaming Tape Device\n");break;
4344 case 2: case 3: case 4: printk("Reserved\n");break;
4345 case 5: printk("CD-ROM Device\n");break;
4346 case 6: printk("Reserved\n");
4347 case 7: printk("Optical memory Device\n");break;
4348 case 0x1f: printk("Unknown or no Device type\n");break;
4349 default: printk("Reserved\n");
4351 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n");
4352 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: ");
4353 switch (gcw.drq_type) {
4354 case 0: printk("Microprocessor DRQ\n");break;
4355 case 1: printk("Interrupt DRQ\n");break;
4356 case 2: printk("Accelerated DRQ\n");break;
4357 case 3: printk("Reserved\n");break;
4359 printk(KERN_INFO "ide-tape: Command Packet Size: ");
4360 switch (gcw.packet_size) {
4361 case 0: printk("12 bytes\n");break;
4362 case 1: printk("16 bytes\n");break;
4363 default: printk("Reserved\n");break;
4365 printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model);
4366 printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev);
4367 printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no);
4368 printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512);
4369 printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
4370 printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
4371 printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
4372 printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
4373 printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
4374 printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO);
4375 printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA);
4376 printk(KERN_INFO "ide-tape: Single Word DMA supported modes: ");
4377 for (i=0,mask=1;i<8;i++,mask=mask << 1) {
4378 if (id->dma_1word & mask)
4380 if (id->dma_1word & (mask << 8))
4381 printk("(active) ");
4384 printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: ");
4385 for (i=0,mask=1;i<8;i++,mask=mask << 1) {
4386 if (id->dma_mword & mask)
4388 if (id->dma_mword & (mask << 8))
4389 printk("(active) ");
4392 if (id->field_valid & 0x0002) {
4393 printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",
4394 id->eide_pio_modes & 1 ? "Mode 3":"None");
4395 printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: ");
4396 if (id->eide_dma_min == 0)
4397 printk("Not supported\n");
4399 printk("%d ns\n",id->eide_dma_min);
4401 printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: ");
4402 if (id->eide_dma_time == 0)
4403 printk("Not supported\n");
4405 printk("%d ns\n",id->eide_dma_time);
4407 printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: ");
4408 if (id->eide_pio == 0)
4409 printk("Not supported\n");
4411 printk("%d ns\n",id->eide_pio);
4413 printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: ");
4414 if (id->eide_pio_iordy == 0)
4415 printk("Not supported\n");
4417 printk("%d ns\n",id->eide_pio_iordy);
4420 printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n");
4421 #endif /* IDETAPE_DEBUG_INFO */
4423 /* Check that we can support this device */
4425 if (gcw.protocol !=2 )
4426 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n");
4427 else if (gcw.device_type != 1)
4428 printk(KERN_ERR "ide-tape: Device type is not set to tape\n");
4429 else if (!gcw.removable)
4430 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
4431 else if (gcw.packet_size != 0) {
4432 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
4433 if (gcw.packet_size == 1)
4434 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
4441 * Use INQUIRY to get the firmware revision
4443 static void idetape_get_inquiry_results (ide_drive_t *drive)
4446 idetape_tape_t *tape = drive->driver_data;
4448 idetape_inquiry_result_t *inquiry;
4450 idetape_create_inquiry_cmd(&pc);
4451 if (idetape_queue_pc_tail(drive, &pc)) {
4452 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
4455 inquiry = (idetape_inquiry_result_t *) pc.buffer;
4456 memcpy(tape->vendor_id, inquiry->vendor_id, 8);
4457 memcpy(tape->product_id, inquiry->product_id, 16);
4458 memcpy(tape->firmware_revision, inquiry->revision_level, 4);
4459 ide_fixstring(tape->vendor_id, 10, 0);
4460 ide_fixstring(tape->product_id, 18, 0);
4461 ide_fixstring(tape->firmware_revision, 6, 0);
4462 r = tape->firmware_revision;
4463 if (*(r + 1) == '.')
4464 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
4465 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);
4469 * idetape_get_mode_sense_results asks the tape about its various
4470 * parameters. In particular, we will adjust our data transfer buffer
4471 * size to the recommended value as returned by the tape.
4473 static void idetape_get_mode_sense_results (ide_drive_t *drive)
4475 idetape_tape_t *tape = drive->driver_data;
4477 idetape_mode_parameter_header_t *header;
4478 idetape_capabilities_page_t *capabilities;
4480 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
4481 if (idetape_queue_pc_tail(drive, &pc)) {
4482 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
4483 tape->tape_block_size = 512;
4484 tape->capabilities.ctl = 52;
4485 tape->capabilities.speed = 450;
4486 tape->capabilities.buffer_size = 6 * 52;
4489 header = (idetape_mode_parameter_header_t *) pc.buffer;
4490 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
4492 capabilities->max_speed = ntohs(capabilities->max_speed);
4493 capabilities->ctl = ntohs(capabilities->ctl);
4494 capabilities->speed = ntohs(capabilities->speed);
4495 capabilities->buffer_size = ntohs(capabilities->buffer_size);
4497 if (!capabilities->speed) {
4498 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
4499 capabilities->speed = 650;
4501 if (!capabilities->max_speed) {
4502 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
4503 capabilities->max_speed = 650;
4506 tape->capabilities = *capabilities; /* Save us a copy */
4507 if (capabilities->blk512)
4508 tape->tape_block_size = 512;
4509 else if (capabilities->blk1024)
4510 tape->tape_block_size = 1024;
4512 #if IDETAPE_DEBUG_INFO
4513 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n");
4514 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n");
4515 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length);
4516 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type);
4517 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp);
4518 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl);
4520 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n");
4521 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code);
4522 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length);
4523 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No");
4524 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
4525 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
4526 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
4527 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
4528 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
4529 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
4530 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
4531 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
4532 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
4533 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
4534 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
4535 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No");
4536 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed);
4537 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl);
4538 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed);
4539 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512);
4540 #endif /* IDETAPE_DEBUG_INFO */
4544 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
4545 * and if it succeeds sets the tape block size with the reported value
4547 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive)
4550 idetape_tape_t *tape = drive->driver_data;
4552 idetape_mode_parameter_header_t *header;
4553 idetape_parameter_block_descriptor_t *block_descrp;
4555 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
4556 if (idetape_queue_pc_tail(drive, &pc)) {
4557 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
4558 if (tape->tape_block_size == 0) {
4559 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n");
4560 tape->tape_block_size = 32768;
4564 header = (idetape_mode_parameter_header_t *) pc.buffer;
4565 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t));
4566 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
4567 tape->drv_write_prot = (header->dsp & 0x80) >> 7;
4569 #if IDETAPE_DEBUG_INFO
4570 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size);
4571 #endif /* IDETAPE_DEBUG_INFO */
4573 static void idetape_add_settings (ide_drive_t *drive)
4575 idetape_tape_t *tape = drive->driver_data;
4578 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
4580 ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
4581 ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
4582 ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
4583 ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
4584 ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
4585 ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
4586 ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL);
4587 ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
4588 ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
4589 ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
4590 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
4591 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL);
4592 ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
4593 ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
4597 * ide_setup is called to:
4599 * 1. Initialize our various state variables.
4600 * 2. Ask the tape for its capabilities.
4601 * 3. Allocate a buffer which will be used for data
4602 * transfer. The buffer size is chosen based on
4603 * the recommendation which we received in step (2).
4605 * Note that at this point ide.c already assigned us an irq, so that
4606 * we can queue requests here and wait for their completion.
4608 static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
4610 unsigned long t1, tmid, tn, t;
4612 struct idetape_id_gcw gcw;
4616 memset(tape, 0, sizeof (idetape_tape_t));
4617 spin_lock_init(&tape->spinlock);
4618 drive->driver_data = tape;
4619 /* An ATAPI device ignores DRDY */
4620 drive->ready_stat = 0;
4621 drive->dsc_overlap = 1;
4622 #ifdef CONFIG_BLK_DEV_IDEPCI
4623 if (HWIF(drive)->pci_dev != NULL) {
4625 * These two ide-pci host adapters appear to need DSC overlap disabled.
4626 * This probably needs further analysis.
4628 if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) ||
4629 (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) {
4630 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name);
4631 drive->dsc_overlap = 0;
4634 #endif /* CONFIG_BLK_DEV_IDEPCI */
4635 /* Seagate Travan drives do not support DSC overlap. */
4636 if (strstr(drive->id->model, "Seagate STT3401"))
4637 drive->dsc_overlap = 0;
4638 tape->drive = drive;
4639 tape->minor = minor;
4640 tape->name[0] = 'h';
4641 tape->name[1] = 't';
4642 tape->name[2] = '0' + minor;
4643 tape->chrdev_direction = idetape_direction_none;
4644 tape->pc = tape->pc_stack;
4645 tape->max_insert_speed = 10000;
4646 tape->speed_control = 1;
4647 *((unsigned short *) &gcw) = drive->id->config;
4648 if (gcw.drq_type == 1)
4649 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
4651 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
4653 idetape_get_inquiry_results(drive);
4654 idetape_get_mode_sense_results(drive);
4655 idetape_get_blocksize_from_block_descriptor(drive);
4656 tape->user_bs_factor = 1;
4657 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4658 while (tape->stage_size > 0xffff) {
4659 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
4660 tape->capabilities.ctl /= 2;
4661 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4663 stage_size = tape->stage_size;
4664 tape->pages_per_stage = stage_size / PAGE_SIZE;
4665 if (stage_size % PAGE_SIZE) {
4666 tape->pages_per_stage++;
4667 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
4671 * Select the "best" DSC read/write polling frequency
4672 * and pipeline size.
4674 speed = max(tape->capabilities.speed, tape->capabilities.max_speed);
4676 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
4679 * Limit memory use for pipeline to 10% of physical memory
4682 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
4683 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
4684 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
4685 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
4686 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
4687 if (tape->max_stages == 0)
4688 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
4690 t1 = (tape->stage_size * HZ) / (speed * 1000);
4691 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
4692 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
4694 if (tape->max_stages)
4700 * Ensure that the number we got makes sense; limit
4701 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
4703 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
4704 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
4705 "%dkB pipeline, %lums tDSC%s\n",
4706 drive->name, tape->name, tape->capabilities.speed,
4707 (tape->capabilities.buffer_size * 512) / tape->stage_size,
4708 tape->stage_size / 1024,
4709 tape->max_stages * tape->stage_size / 1024,
4710 tape->best_dsc_rw_frequency * 1000 / HZ,
4711 drive->using_dma ? ", DMA":"");
4713 idetape_add_settings(drive);
4716 static int idetape_cleanup (ide_drive_t *drive)
4718 idetape_tape_t *tape = drive->driver_data;
4719 int minor = tape->minor;
4720 unsigned long flags;
4722 spin_lock_irqsave(&ide_lock, flags);
4723 if (test_bit(IDETAPE_BUSY, &tape->flags) || drive->usage ||
4724 tape->first_stage != NULL || tape->merge_stage_size) {
4725 spin_unlock_irqrestore(&ide_lock, flags);
4728 idetape_chrdevs[minor].drive = NULL;
4729 spin_unlock_irqrestore(&ide_lock, flags);
4730 DRIVER(drive)->busy = 0;
4731 (void) ide_unregister_subdriver(drive);
4732 drive->driver_data = NULL;
4733 devfs_remove("%s/mt", drive->devfs_name);
4734 devfs_remove("%s/mtn", drive->devfs_name);
4735 devfs_unregister_tape(drive->disk->number);
4737 drive->disk->fops = ide_fops;
4741 #ifdef CONFIG_PROC_FS
4743 static int proc_idetape_read_name
4744 (char *page, char **start, off_t off, int count, int *eof, void *data)
4746 ide_drive_t *drive = (ide_drive_t *) data;
4747 idetape_tape_t *tape = drive->driver_data;
4751 len = sprintf(out, "%s\n", tape->name);
4752 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
4755 static ide_proc_entry_t idetape_proc[] = {
4756 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
4757 { NULL, 0, NULL, NULL }
4762 #define idetape_proc NULL
4766 static int idetape_attach(ide_drive_t *drive);
4769 * IDE subdriver functions, registered with ide.c
4771 static ide_driver_t idetape_driver = {
4772 .owner = THIS_MODULE,
4774 .version = IDETAPE_VERSION,
4777 .supports_dsc_overlap = 1,
4778 .cleanup = idetape_cleanup,
4779 .do_request = idetape_do_request,
4780 .end_request = idetape_end_request,
4781 .pre_reset = idetape_pre_reset,
4782 .proc = idetape_proc,
4783 .attach = idetape_attach,
4784 .drives = LIST_HEAD_INIT(idetape_driver.drives),
4788 * Our character device supporting functions, passed to register_chrdev.
4790 static struct file_operations idetape_fops = {
4791 .owner = THIS_MODULE,
4792 .read = idetape_chrdev_read,
4793 .write = idetape_chrdev_write,
4794 .ioctl = idetape_chrdev_ioctl,
4795 .open = idetape_chrdev_open,
4796 .release = idetape_chrdev_release,
4799 static int idetape_open(struct inode *inode, struct file *filp)
4801 ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
4806 static int idetape_release(struct inode *inode, struct file *filp)
4808 ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
4813 static int idetape_ioctl(struct inode *inode, struct file *file,
4814 unsigned int cmd, unsigned long arg)
4816 struct block_device *bdev = inode->i_bdev;
4817 ide_drive_t *drive = bdev->bd_disk->private_data;
4818 int err = generic_ide_ioctl(bdev, cmd, arg);
4820 err = idetape_blkdev_ioctl(drive, cmd, arg);
4824 static struct block_device_operations idetape_block_ops = {
4825 .owner = THIS_MODULE,
4826 .open = idetape_open,
4827 .release = idetape_release,
4828 .ioctl = idetape_ioctl,
4831 static int idetape_attach (ide_drive_t *drive)
4833 idetape_tape_t *tape;
4836 if (!strstr("ide-tape", drive->driver_req))
4838 if (!drive->present)
4840 if (drive->media != ide_tape)
4842 if (!idetape_identify_device (drive)) {
4843 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
4847 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
4850 if (strstr(drive->id->model, "OnStream DI-")) {
4851 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
4852 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
4854 tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL);
4856 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
4859 if (ide_register_subdriver(drive, &idetape_driver)) {
4860 printk(KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name);
4864 for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++)
4866 idetape_setup(drive, tape, minor);
4867 idetape_chrdevs[minor].drive = drive;
4869 devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor),
4870 S_IFCHR | S_IRUGO | S_IWUGO,
4871 "%s/mt", drive->devfs_name);
4872 devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor + 128),
4873 S_IFCHR | S_IRUGO | S_IWUGO,
4874 "%s/mtn", drive->devfs_name);
4876 drive->disk->number = devfs_register_tape(drive->devfs_name);
4877 drive->disk->fops = &idetape_block_ops;
4883 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4884 MODULE_LICENSE("GPL");
4886 static void __exit idetape_exit (void)
4888 ide_unregister_driver(&idetape_driver);
4889 unregister_chrdev(IDETAPE_MAJOR, "ht");
4893 * idetape_init will register the driver for each tape.
4895 static int idetape_init (void)
4897 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
4898 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
4901 ide_register_driver(&idetape_driver);
4905 module_init(idetape_init);
4906 module_exit(idetape_exit);
4907 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);