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>
445 #include <linux/bitops.h>
447 #include <asm/byteorder.h>
449 #include <asm/uaccess.h>
451 #include <asm/unaligned.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_BUGS 1
536 * After each failed packet command we issue a request sense command
537 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
539 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
541 #define IDETAPE_MAX_PC_RETRIES 3
544 * With each packet command, we allocate a buffer of
545 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
546 * commands (Not for READ/WRITE commands).
548 #define IDETAPE_PC_BUFFER_SIZE 256
551 * In various places in the driver, we need to allocate storage
552 * for packet commands and requests, which will remain valid while
553 * we leave the driver to wait for an interrupt or a timeout event.
555 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
558 * Some drives (for example, Seagate STT3401A Travan) require a very long
559 * timeout, because they don't return an interrupt or clear their busy bit
560 * until after the command completes (even retension commands).
562 #define IDETAPE_WAIT_CMD (900*HZ)
565 * The following parameter is used to select the point in the internal
566 * tape fifo in which we will start to refill the buffer. Decreasing
567 * the following parameter will improve the system's latency and
568 * interactive response, while using a high value might improve sytem
571 #define IDETAPE_FIFO_THRESHOLD 2
574 * DSC polling parameters.
576 * Polling for DSC (a single bit in the status register) is a very
577 * important function in ide-tape. There are two cases in which we
580 * 1. Before a read/write packet command, to ensure that we
581 * can transfer data from/to the tape's data buffers, without
582 * causing an actual media access. In case the tape is not
583 * ready yet, we take out our request from the device
584 * request queue, so that ide.c will service requests from
585 * the other device on the same interface meanwhile.
587 * 2. After the successful initialization of a "media access
588 * packet command", which is a command which can take a long
589 * time to complete (it can be several seconds or even an hour).
591 * Again, we postpone our request in the middle to free the bus
592 * for the other device. The polling frequency here should be
593 * lower than the read/write frequency since those media access
594 * commands are slow. We start from a "fast" frequency -
595 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
596 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
597 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
599 * We also set a timeout for the timer, in case something goes wrong.
600 * The timeout should be longer then the maximum execution time of a
607 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
608 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
609 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
610 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
611 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
612 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
613 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
615 /*************************** End of tunable parameters ***********************/
618 * Debugging/Performance analysis
622 #define USE_IOTRACE 0
624 #include <linux/io_trace.h>
625 #define IO_IDETAPE_FIFO 500
629 * Read/Write error simulation
631 #define SIMULATE_ERRORS 0
634 * For general magnetic tape device compatibility.
637 idetape_direction_none,
638 idetape_direction_read,
639 idetape_direction_write
640 } idetape_chrdev_direction_t;
643 unsigned short b_size;
645 struct idetape_bh *b_reqnext;
650 * Our view of a packet command.
652 typedef struct idetape_packet_command_s {
653 u8 c[12]; /* Actual packet bytes */
654 int retries; /* On each retry, we increment retries */
655 int error; /* Error code */
656 int request_transfer; /* Bytes to transfer */
657 int actually_transferred; /* Bytes actually transferred */
658 int buffer_size; /* Size of our data buffer */
659 struct idetape_bh *bh;
662 u8 *buffer; /* Data buffer */
663 u8 *current_position; /* Pointer into the above buffer */
664 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
665 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
666 unsigned long flags; /* Status/Action bit flags: long for set_bit */
670 * Packet command flag bits.
672 /* Set when an error is considered normal - We won't retry */
674 /* 1 When polling for DSC on a media access command */
675 #define PC_WAIT_FOR_DSC 1
676 /* 1 when we prefer to use DMA if possible */
677 #define PC_DMA_RECOMMENDED 2
678 /* 1 while DMA in progress */
679 #define PC_DMA_IN_PROGRESS 3
680 /* 1 when encountered problem during DMA */
681 #define PC_DMA_ERROR 4
686 * Capabilities and Mechanical Status Page
689 unsigned page_code :6; /* Page code - Should be 0x2a */
691 __u8 ps :1; /* parameters saveable */
692 __u8 page_length; /* Page Length - Should be 0x12 */
693 __u8 reserved2, reserved3;
694 unsigned ro :1; /* Read Only Mode */
695 unsigned reserved4_1234 :4;
696 unsigned sprev :1; /* Supports SPACE in the reverse direction */
697 unsigned reserved4_67 :2;
698 unsigned reserved5_012 :3;
699 unsigned efmt :1; /* Supports ERASE command initiated formatting */
700 unsigned reserved5_4 :1;
701 unsigned qfa :1; /* Supports the QFA two partition formats */
702 unsigned reserved5_67 :2;
703 unsigned lock :1; /* Supports locking the volume */
704 unsigned locked :1; /* The volume is locked */
705 unsigned prevent :1; /* The device defaults in the prevent state after power up */
706 unsigned eject :1; /* The device can eject the volume */
707 __u8 disconnect :1; /* The device can break request > ctl */
709 unsigned ecc :1; /* Supports error correction */
710 unsigned cmprs :1; /* Supports data compression */
711 unsigned reserved7_0 :1;
712 unsigned blk512 :1; /* Supports 512 bytes block size */
713 unsigned blk1024 :1; /* Supports 1024 bytes block size */
714 unsigned reserved7_3_6 :4;
715 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
716 /* transfers for slow buffer memory ??? */
717 /* Also 32768 block size in some cases */
718 __u16 max_speed; /* Maximum speed supported in KBps */
719 __u8 reserved10, reserved11;
720 __u16 ctl; /* Continuous Transfer Limit in blocks */
721 __u16 speed; /* Current Speed, in KBps */
722 __u16 buffer_size; /* Buffer Size, in 512 bytes */
723 __u8 reserved18, reserved19;
724 } idetape_capabilities_page_t;
730 unsigned page_code :6; /* Page code - Should be 0x30 */
731 unsigned reserved1_6 :1;
733 __u8 page_length; /* Page Length - Should be 2 */
736 unsigned play32_5 :1;
737 unsigned reserved2_23 :2;
738 unsigned record32 :1;
739 unsigned record32_5 :1;
740 unsigned reserved2_6 :1;
742 } idetape_block_size_page_t;
747 typedef struct idetape_stage_s {
748 struct request rq; /* The corresponding request */
749 struct idetape_bh *bh; /* The data buffers */
750 struct idetape_stage_s *next; /* Pointer to the next stage */
754 * REQUEST SENSE packet command result - Data Format.
757 unsigned error_code :7; /* Current of deferred errors */
758 unsigned valid :1; /* The information field conforms to QIC-157C */
759 __u8 reserved1 :8; /* Segment Number - Reserved */
760 unsigned sense_key :4; /* Sense Key */
761 unsigned reserved2_4 :1; /* Reserved */
762 unsigned ili :1; /* Incorrect Length Indicator */
763 unsigned eom :1; /* End Of Medium */
764 unsigned filemark :1; /* Filemark */
765 __u32 information __attribute__ ((packed));
766 __u8 asl; /* Additional sense length (n-7) */
767 __u32 command_specific; /* Additional command specific information */
768 __u8 asc; /* Additional Sense Code */
769 __u8 ascq; /* Additional Sense Code Qualifier */
770 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */
771 unsigned sk_specific1 :7; /* Sense Key Specific */
772 unsigned sksv :1; /* Sense Key Specific information is valid */
773 __u8 sk_specific2; /* Sense Key Specific */
774 __u8 sk_specific3; /* Sense Key Specific */
775 __u8 pad[2]; /* Padding to 20 bytes */
776 } idetape_request_sense_result_t;
780 * Most of our global data which we need to save even as we leave the
781 * driver due to an interrupt or a timer event is stored in a variable
782 * of type idetape_tape_t, defined below.
787 * Since a typical character device operation requires more
788 * than one packet command, we provide here enough memory
789 * for the maximum of interconnected packet commands.
790 * The packet commands are stored in the circular array pc_stack.
791 * pc_stack_index points to the last used entry, and warps around
792 * to the start when we get to the last array entry.
794 * pc points to the current processed packet command.
796 * failed_pc points to the last failed packet command, or contains
797 * NULL if we do not need to retry any packet command. This is
798 * required since an additional packet command is needed before the
799 * retry, to get detailed information on what went wrong.
801 /* Current packet command */
803 /* Last failed packet command */
804 idetape_pc_t *failed_pc;
805 /* Packet command stack */
806 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
807 /* Next free packet command storage space */
809 struct request rq_stack[IDETAPE_PC_STACK];
810 /* We implement a circular array */
814 * DSC polling variables.
816 * While polling for DSC we use postponed_rq to postpone the
817 * current request so that ide.c will be able to service
818 * pending requests on the other device. Note that at most
819 * we will have only one DSC (usually data transfer) request
820 * in the device request queue. Additional requests can be
821 * queued in our internal pipeline, but they will be visible
822 * to ide.c only one at a time.
824 struct request *postponed_rq;
825 /* The time in which we started polling for DSC */
826 unsigned long dsc_polling_start;
827 /* Timer used to poll for dsc */
828 struct timer_list dsc_timer;
829 /* Read/Write dsc polling frequency */
830 unsigned long best_dsc_rw_frequency;
831 /* The current polling frequency */
832 unsigned long dsc_polling_frequency;
833 /* Maximum waiting time */
834 unsigned long dsc_timeout;
837 * Read position information
841 unsigned int first_frame_position;
842 unsigned int last_frame_position;
843 unsigned int blocks_in_buffer;
846 * Last error information
848 u8 sense_key, asc, ascq;
851 * Character device operation
856 /* Current character device data transfer direction */
857 idetape_chrdev_direction_t chrdev_direction;
862 /* Usually 512 or 1024 bytes */
863 unsigned short tape_block_size;
865 /* Copy of the tape's Capabilities and Mechanical Page */
866 idetape_capabilities_page_t capabilities;
869 * Active data transfer request parameters.
871 * At most, there is only one ide-tape originated data transfer
872 * request in the device request queue. This allows ide.c to
873 * easily service requests from the other device when we
874 * postpone our active request. In the pipelined operation
875 * mode, we use our internal pipeline structure to hold
876 * more data requests.
878 * The data buffer size is chosen based on the tape's
881 /* Pointer to the request which is waiting in the device request queue */
882 struct request *active_data_request;
883 /* Data buffer size (chosen based on the tape's recommendation */
885 idetape_stage_t *merge_stage;
886 int merge_stage_size;
887 struct idetape_bh *bh;
892 * Pipeline parameters.
894 * To accomplish non-pipelined mode, we simply set the following
895 * variables to zero (or NULL, where appropriate).
897 /* Number of currently used stages */
899 /* Number of pending stages */
900 int nr_pending_stages;
901 /* We will not allocate more than this number of stages */
902 int max_stages, min_pipeline, max_pipeline;
903 /* The first stage which will be removed from the pipeline */
904 idetape_stage_t *first_stage;
905 /* The currently active stage */
906 idetape_stage_t *active_stage;
907 /* Will be serviced after the currently active request */
908 idetape_stage_t *next_stage;
909 /* New requests will be added to the pipeline here */
910 idetape_stage_t *last_stage;
911 /* Optional free stage which we can use */
912 idetape_stage_t *cache_stage;
914 /* Wasted space in each stage */
917 /* Status/Action flags: long for set_bit */
919 /* protects the ide-tape queue */
923 * Measures average tape speed
925 unsigned long avg_time;
929 /* last sense information */
930 idetape_request_sense_result_t sense;
934 char firmware_revision[6];
935 int firmware_revision_num;
937 /* the door is currently locked */
939 /* the tape hardware is write protected */
941 /* the tape is write protected (hardware or opened as read-only) */
945 * Limit the number of times a request can
946 * be postponed, to avoid an infinite postpone
949 /* request postpone count limit */
953 * Measures number of frames:
955 * 1. written/read to/from the driver pipeline (pipeline_head).
956 * 2. written/read to/from the tape buffers (idetape_bh).
957 * 3. written/read by the tape to/from the media (tape_head).
965 * Speed control at the tape buffers input/output
967 unsigned long insert_time;
970 int max_insert_speed;
971 int measure_insert_time;
974 * Measure tape still time, in milliseconds
976 unsigned long tape_still_time_begin;
980 * Speed regulation negative feedback loop
983 int pipeline_head_speed;
984 int controlled_pipeline_head_speed;
985 int uncontrolled_pipeline_head_speed;
986 int controlled_last_pipeline_head;
987 int uncontrolled_last_pipeline_head;
988 unsigned long uncontrolled_pipeline_head_time;
989 unsigned long controlled_pipeline_head_time;
990 int controlled_previous_pipeline_head;
991 int uncontrolled_previous_pipeline_head;
992 unsigned long controlled_previous_head_time;
993 unsigned long uncontrolled_previous_head_time;
994 int restart_speed_control_req;
997 * Debug_level determines amount of debugging output;
998 * can be changed using /proc/ide/hdx/settings
999 * 0 : almost no debugging output
1000 * 1 : 0+output errors only
1001 * 2 : 1+output all sensekey/asc
1002 * 3 : 2+follow all chrdev related procedures
1003 * 4 : 3+follow all procedures
1004 * 5 : 4+include pc_stack rq_stack info
1005 * 6 : 5+USE_COUNT updates
1013 #define DOOR_UNLOCKED 0
1014 #define DOOR_LOCKED 1
1015 #define DOOR_EXPLICITLY_LOCKED 2
1018 * Tape flag bits values.
1020 #define IDETAPE_IGNORE_DSC 0
1021 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
1022 #define IDETAPE_BUSY 2 /* Device already opened */
1023 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
1024 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
1025 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
1026 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
1027 #define IDETAPE_READ_ERROR 7
1028 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
1029 /* 0 = no tape is loaded, so we don't rewind after ejecting */
1030 #define IDETAPE_MEDIUM_PRESENT 9
1033 * Supported ATAPI tape drives packet commands
1035 #define IDETAPE_TEST_UNIT_READY_CMD 0x00
1036 #define IDETAPE_REWIND_CMD 0x01
1037 #define IDETAPE_REQUEST_SENSE_CMD 0x03
1038 #define IDETAPE_READ_CMD 0x08
1039 #define IDETAPE_WRITE_CMD 0x0a
1040 #define IDETAPE_WRITE_FILEMARK_CMD 0x10
1041 #define IDETAPE_SPACE_CMD 0x11
1042 #define IDETAPE_INQUIRY_CMD 0x12
1043 #define IDETAPE_ERASE_CMD 0x19
1044 #define IDETAPE_MODE_SENSE_CMD 0x1a
1045 #define IDETAPE_MODE_SELECT_CMD 0x15
1046 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b
1047 #define IDETAPE_PREVENT_CMD 0x1e
1048 #define IDETAPE_LOCATE_CMD 0x2b
1049 #define IDETAPE_READ_POSITION_CMD 0x34
1050 #define IDETAPE_READ_BUFFER_CMD 0x3c
1051 #define IDETAPE_SET_SPEED_CMD 0xbb
1054 * Some defines for the READ BUFFER command
1056 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
1059 * Some defines for the SPACE command
1061 #define IDETAPE_SPACE_OVER_FILEMARK 1
1062 #define IDETAPE_SPACE_TO_EOD 3
1065 * Some defines for the LOAD UNLOAD command
1067 #define IDETAPE_LU_LOAD_MASK 1
1068 #define IDETAPE_LU_RETENSION_MASK 2
1069 #define IDETAPE_LU_EOT_MASK 4
1072 * Special requests for our block device strategy routine.
1074 * In order to service a character device command, we add special
1075 * requests to the tail of our block device request queue and wait
1076 * for their completion.
1080 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
1081 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
1082 REQ_IDETAPE_READ = (1 << 2),
1083 REQ_IDETAPE_WRITE = (1 << 3),
1084 REQ_IDETAPE_READ_BUFFER = (1 << 4),
1088 * Error codes which are returned in rq->errors to the higher part
1091 #define IDETAPE_ERROR_GENERAL 101
1092 #define IDETAPE_ERROR_FILEMARK 102
1093 #define IDETAPE_ERROR_EOD 103
1096 * idetape_chrdev_t provides the link between out character device
1097 * interface and our block device interface and the corresponding
1098 * ide_drive_t structure.
1105 * The following is used to format the general configuration word of
1106 * the ATAPI IDENTIFY DEVICE command.
1108 struct idetape_id_gcw {
1109 unsigned packet_size :2; /* Packet Size */
1110 unsigned reserved234 :3; /* Reserved */
1111 unsigned drq_type :2; /* Command packet DRQ type */
1112 unsigned removable :1; /* Removable media */
1113 unsigned device_type :5; /* Device type */
1114 unsigned reserved13 :1; /* Reserved */
1115 unsigned protocol :2; /* Protocol type */
1119 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
1122 unsigned device_type :5; /* Peripheral Device Type */
1123 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
1124 unsigned reserved1_6t0 :7; /* Reserved */
1125 unsigned rmb :1; /* Removable Medium Bit */
1126 unsigned ansi_version :3; /* ANSI Version */
1127 unsigned ecma_version :3; /* ECMA Version */
1128 unsigned iso_version :2; /* ISO Version */
1129 unsigned response_format :4; /* Response Data Format */
1130 unsigned reserved3_45 :2; /* Reserved */
1131 unsigned reserved3_6 :1; /* TrmIOP - Reserved */
1132 unsigned reserved3_7 :1; /* AENC - Reserved */
1133 __u8 additional_length; /* Additional Length (total_length-4) */
1134 __u8 rsv5, rsv6, rsv7; /* Reserved */
1135 __u8 vendor_id[8]; /* Vendor Identification */
1136 __u8 product_id[16]; /* Product Identification */
1137 __u8 revision_level[4]; /* Revision Level */
1138 __u8 vendor_specific[20]; /* Vendor Specific - Optional */
1139 __u8 reserved56t95[40]; /* Reserved - Optional */
1140 /* Additional information may be returned */
1141 } idetape_inquiry_result_t;
1144 * READ POSITION packet command - Data Format (From Table 6-57)
1147 unsigned reserved0_10 :2; /* Reserved */
1148 unsigned bpu :1; /* Block Position Unknown */
1149 unsigned reserved0_543 :3; /* Reserved */
1150 unsigned eop :1; /* End Of Partition */
1151 unsigned bop :1; /* Beginning Of Partition */
1152 u8 partition; /* Partition Number */
1153 u8 reserved2, reserved3; /* Reserved */
1154 u32 first_block; /* First Block Location */
1155 u32 last_block; /* Last Block Location (Optional) */
1156 u8 reserved12; /* Reserved */
1157 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
1158 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
1159 } idetape_read_position_result_t;
1162 * Follows structures which are related to the SELECT SENSE / MODE SENSE
1163 * packet commands. Those packet commands are still not supported
1166 #define IDETAPE_BLOCK_DESCRIPTOR 0
1167 #define IDETAPE_CAPABILITIES_PAGE 0x2a
1168 #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
1169 #define IDETAPE_BLOCK_SIZE_PAGE 0x30
1170 #define IDETAPE_BUFFER_FILLING_PAGE 0x33
1173 * Mode Parameter Header for the MODE SENSE packet command
1176 __u8 mode_data_length; /* Length of the following data transfer */
1177 __u8 medium_type; /* Medium Type */
1178 __u8 dsp; /* Device Specific Parameter */
1179 __u8 bdl; /* Block Descriptor Length */
1181 /* data transfer page */
1183 __u8 reserved0_6 :1;
1184 __u8 ps :1; /* parameters saveable */
1185 __u8 page_length; /* page Length == 0x02 */
1187 __u8 read32k :1; /* 32k blk size (data only) */
1188 __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */
1189 __u8 reserved3_23 :2;
1190 __u8 write32k :1; /* 32k blk size (data only) */
1191 __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */
1192 __u8 reserved3_6 :1;
1193 __u8 streaming :1; /* streaming mode enable */
1195 } idetape_mode_parameter_header_t;
1198 * Mode Parameter Block Descriptor the MODE SENSE packet command
1200 * Support for block descriptors is optional.
1203 __u8 density_code; /* Medium density code */
1204 __u8 blocks[3]; /* Number of blocks */
1205 __u8 reserved4; /* Reserved */
1206 __u8 length[3]; /* Block Length */
1207 } idetape_parameter_block_descriptor_t;
1210 * The Data Compression Page, as returned by the MODE SENSE packet command.
1213 unsigned page_code :6; /* Page Code - Should be 0xf */
1214 unsigned reserved0 :1; /* Reserved */
1216 __u8 page_length; /* Page Length - Should be 14 */
1217 unsigned reserved2 :6; /* Reserved */
1218 unsigned dcc :1; /* Data Compression Capable */
1219 unsigned dce :1; /* Data Compression Enable */
1220 unsigned reserved3 :5; /* Reserved */
1221 unsigned red :2; /* Report Exception on Decompression */
1222 unsigned dde :1; /* Data Decompression Enable */
1223 __u32 ca; /* Compression Algorithm */
1224 __u32 da; /* Decompression Algorithm */
1225 __u8 reserved[4]; /* Reserved */
1226 } idetape_data_compression_page_t;
1229 * The Medium Partition Page, as returned by the MODE SENSE packet command.
1232 unsigned page_code :6; /* Page Code - Should be 0x11 */
1233 unsigned reserved1_6 :1; /* Reserved */
1235 __u8 page_length; /* Page Length - Should be 6 */
1236 __u8 map; /* Maximum Additional Partitions - Should be 0 */
1237 __u8 apd; /* Additional Partitions Defined - Should be 0 */
1238 unsigned reserved4_012 :3; /* Reserved */
1239 unsigned psum :2; /* Should be 0 */
1240 unsigned idp :1; /* Should be 0 */
1241 unsigned sdp :1; /* Should be 0 */
1242 unsigned fdp :1; /* Fixed Data Partitions */
1243 __u8 mfr; /* Medium Format Recognition */
1244 __u8 reserved[2]; /* Reserved */
1245 } idetape_medium_partition_page_t;
1248 * Run time configurable parameters.
1251 int dsc_rw_frequency;
1252 int dsc_media_access_frequency;
1257 * The variables below are used for the character device interface.
1258 * Additional state variables are defined in our ide_drive_t structure.
1260 static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES];
1263 * Function declarations
1266 static int idetape_chrdev_release (struct inode *inode, struct file *filp);
1267 static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
1270 * Too bad. The drive wants to send us data which we are not ready to accept.
1271 * Just throw it away.
1273 static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
1276 (void) HWIF(drive)->INB(IDE_DATA_REG);
1279 static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
1281 struct idetape_bh *bh = pc->bh;
1285 #if IDETAPE_DEBUG_BUGS
1287 printk(KERN_ERR "ide-tape: bh == NULL in "
1288 "idetape_input_buffers\n");
1289 idetape_discard_data(drive, bcount);
1292 #endif /* IDETAPE_DEBUG_BUGS */
1293 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
1294 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
1296 atomic_add(count, &bh->b_count);
1297 if (atomic_read(&bh->b_count) == bh->b_size) {
1300 atomic_set(&bh->b_count, 0);
1306 static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
1308 struct idetape_bh *bh = pc->bh;
1312 #if IDETAPE_DEBUG_BUGS
1314 printk(KERN_ERR "ide-tape: bh == NULL in "
1315 "idetape_output_buffers\n");
1318 #endif /* IDETAPE_DEBUG_BUGS */
1319 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
1320 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
1322 pc->b_data += count;
1323 pc->b_count -= count;
1325 pc->bh = bh = bh->b_reqnext;
1327 pc->b_data = bh->b_data;
1328 pc->b_count = atomic_read(&bh->b_count);
1334 static void idetape_update_buffers (idetape_pc_t *pc)
1336 struct idetape_bh *bh = pc->bh;
1338 unsigned int bcount = pc->actually_transferred;
1340 if (test_bit(PC_WRITING, &pc->flags))
1343 #if IDETAPE_DEBUG_BUGS
1345 printk(KERN_ERR "ide-tape: bh == NULL in "
1346 "idetape_update_buffers\n");
1349 #endif /* IDETAPE_DEBUG_BUGS */
1350 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
1351 atomic_set(&bh->b_count, count);
1352 if (atomic_read(&bh->b_count) == bh->b_size)
1360 * idetape_next_pc_storage returns a pointer to a place in which we can
1361 * safely store a packet command, even though we intend to leave the
1362 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
1363 * commands is allocated at initialization time.
1365 static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
1367 idetape_tape_t *tape = drive->driver_data;
1369 #if IDETAPE_DEBUG_LOG
1370 if (tape->debug_level >= 5)
1371 printk(KERN_INFO "ide-tape: pc_stack_index=%d\n",
1372 tape->pc_stack_index);
1373 #endif /* IDETAPE_DEBUG_LOG */
1374 if (tape->pc_stack_index == IDETAPE_PC_STACK)
1375 tape->pc_stack_index=0;
1376 return (&tape->pc_stack[tape->pc_stack_index++]);
1380 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
1381 * Since we queue packet commands in the request queue, we need to
1382 * allocate a request, along with the allocation of a packet command.
1385 /**************************************************************
1387 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
1388 * followed later on by kfree(). -ml *
1390 **************************************************************/
1392 static struct request *idetape_next_rq_storage (ide_drive_t *drive)
1394 idetape_tape_t *tape = drive->driver_data;
1396 #if IDETAPE_DEBUG_LOG
1397 if (tape->debug_level >= 5)
1398 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n",
1399 tape->rq_stack_index);
1400 #endif /* IDETAPE_DEBUG_LOG */
1401 if (tape->rq_stack_index == IDETAPE_PC_STACK)
1402 tape->rq_stack_index=0;
1403 return (&tape->rq_stack[tape->rq_stack_index++]);
1407 * idetape_init_pc initializes a packet command.
1409 static void idetape_init_pc (idetape_pc_t *pc)
1411 memset(pc->c, 0, 12);
1414 pc->request_transfer = 0;
1415 pc->buffer = pc->pc_buffer;
1416 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
1422 * idetape_analyze_error is called on each failed packet command retry
1423 * to analyze the request sense. We currently do not utilize this
1426 static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result)
1428 idetape_tape_t *tape = drive->driver_data;
1429 idetape_pc_t *pc = tape->failed_pc;
1431 tape->sense = *result;
1432 tape->sense_key = result->sense_key;
1433 tape->asc = result->asc;
1434 tape->ascq = result->ascq;
1435 #if IDETAPE_DEBUG_LOG
1437 * Without debugging, we only log an error if we decided to
1440 if (tape->debug_level >= 1)
1441 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, "
1442 "asc = %x, ascq = %x\n",
1443 pc->c[0], result->sense_key,
1444 result->asc, result->ascq);
1445 #endif /* IDETAPE_DEBUG_LOG */
1448 * Correct pc->actually_transferred by asking the tape.
1450 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
1451 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information));
1452 idetape_update_buffers(pc);
1456 * If error was the result of a zero-length read or write command,
1457 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
1458 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
1460 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD)
1461 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */
1462 if (result->sense_key == 5) {
1463 /* don't report an error, everything's ok */
1465 /* don't retry read/write */
1466 set_bit(PC_ABORT, &pc->flags);
1469 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
1470 pc->error = IDETAPE_ERROR_FILEMARK;
1471 set_bit(PC_ABORT, &pc->flags);
1473 if (pc->c[0] == IDETAPE_WRITE_CMD) {
1475 (result->sense_key == 0xd && result->asc == 0x0 &&
1476 result->ascq == 0x2)) {
1477 pc->error = IDETAPE_ERROR_EOD;
1478 set_bit(PC_ABORT, &pc->flags);
1481 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
1482 if (result->sense_key == 8) {
1483 pc->error = IDETAPE_ERROR_EOD;
1484 set_bit(PC_ABORT, &pc->flags);
1486 if (!test_bit(PC_ABORT, &pc->flags) &&
1487 pc->actually_transferred)
1488 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
1493 * idetape_active_next_stage will declare the next stage as "active".
1495 static void idetape_active_next_stage (ide_drive_t *drive)
1497 idetape_tape_t *tape = drive->driver_data;
1498 idetape_stage_t *stage = tape->next_stage;
1499 struct request *rq = &stage->rq;
1501 #if IDETAPE_DEBUG_LOG
1502 if (tape->debug_level >= 4)
1503 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
1504 #endif /* IDETAPE_DEBUG_LOG */
1505 #if IDETAPE_DEBUG_BUGS
1506 if (stage == NULL) {
1507 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
1510 #endif /* IDETAPE_DEBUG_BUGS */
1513 rq->special = (void *)stage->bh;
1514 tape->active_data_request = rq;
1515 tape->active_stage = stage;
1516 tape->next_stage = stage->next;
1520 * idetape_increase_max_pipeline_stages is a part of the feedback
1521 * loop which tries to find the optimum number of stages. In the
1522 * feedback loop, we are starting from a minimum maximum number of
1523 * stages, and if we sense that the pipeline is empty, we try to
1524 * increase it, until we reach the user compile time memory limit.
1526 static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
1528 idetape_tape_t *tape = drive->driver_data;
1529 int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
1531 #if IDETAPE_DEBUG_LOG
1532 if (tape->debug_level >= 4)
1533 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
1534 #endif /* IDETAPE_DEBUG_LOG */
1536 tape->max_stages += max(increase, 1);
1537 tape->max_stages = max(tape->max_stages, tape->min_pipeline);
1538 tape->max_stages = min(tape->max_stages, tape->max_pipeline);
1542 * idetape_kfree_stage calls kfree to completely free a stage, along with
1543 * its related buffers.
1545 static void __idetape_kfree_stage (idetape_stage_t *stage)
1547 struct idetape_bh *prev_bh, *bh = stage->bh;
1550 while (bh != NULL) {
1551 if (bh->b_data != NULL) {
1552 size = (int) bh->b_size;
1554 free_page((unsigned long) bh->b_data);
1556 bh->b_data += PAGE_SIZE;
1566 static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
1568 __idetape_kfree_stage(stage);
1572 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1573 * The caller should avoid race conditions.
1575 static void idetape_remove_stage_head (ide_drive_t *drive)
1577 idetape_tape_t *tape = drive->driver_data;
1578 idetape_stage_t *stage;
1580 #if IDETAPE_DEBUG_LOG
1581 if (tape->debug_level >= 4)
1582 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
1583 #endif /* IDETAPE_DEBUG_LOG */
1584 #if IDETAPE_DEBUG_BUGS
1585 if (tape->first_stage == NULL) {
1586 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
1589 if (tape->active_stage == tape->first_stage) {
1590 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
1593 #endif /* IDETAPE_DEBUG_BUGS */
1594 stage = tape->first_stage;
1595 tape->first_stage = stage->next;
1596 idetape_kfree_stage(tape, stage);
1598 if (tape->first_stage == NULL) {
1599 tape->last_stage = NULL;
1600 #if IDETAPE_DEBUG_BUGS
1601 if (tape->next_stage != NULL)
1602 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
1603 if (tape->nr_stages)
1604 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
1605 #endif /* IDETAPE_DEBUG_BUGS */
1610 * This will free all the pipeline stages starting from new_last_stage->next
1611 * to the end of the list, and point tape->last_stage to new_last_stage.
1613 static void idetape_abort_pipeline(ide_drive_t *drive,
1614 idetape_stage_t *new_last_stage)
1616 idetape_tape_t *tape = drive->driver_data;
1617 idetape_stage_t *stage = new_last_stage->next;
1618 idetape_stage_t *nstage;
1620 #if IDETAPE_DEBUG_LOG
1621 if (tape->debug_level >= 4)
1622 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
1625 nstage = stage->next;
1626 idetape_kfree_stage(tape, stage);
1628 --tape->nr_pending_stages;
1632 new_last_stage->next = NULL;
1633 tape->last_stage = new_last_stage;
1634 tape->next_stage = NULL;
1638 * idetape_end_request is used to finish servicing a request, and to
1639 * insert a pending pipeline request into the main device queue.
1641 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
1643 struct request *rq = HWGROUP(drive)->rq;
1644 idetape_tape_t *tape = drive->driver_data;
1645 unsigned long flags;
1647 int remove_stage = 0;
1648 idetape_stage_t *active_stage;
1650 #if IDETAPE_DEBUG_LOG
1651 if (tape->debug_level >= 4)
1652 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n");
1653 #endif /* IDETAPE_DEBUG_LOG */
1656 case 0: error = IDETAPE_ERROR_GENERAL; break;
1657 case 1: error = 0; break;
1658 default: error = uptodate;
1662 tape->failed_pc = NULL;
1664 spin_lock_irqsave(&tape->spinlock, flags);
1666 /* The request was a pipelined data transfer request */
1667 if (tape->active_data_request == rq) {
1668 active_stage = tape->active_stage;
1669 tape->active_stage = NULL;
1670 tape->active_data_request = NULL;
1671 tape->nr_pending_stages--;
1672 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1675 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1676 if (error == IDETAPE_ERROR_EOD)
1677 idetape_abort_pipeline(drive, active_stage);
1679 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
1680 if (error == IDETAPE_ERROR_EOD) {
1681 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1682 idetape_abort_pipeline(drive, active_stage);
1685 if (tape->next_stage != NULL) {
1686 idetape_active_next_stage(drive);
1689 * Insert the next request into the request queue.
1691 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
1692 } else if (!error) {
1693 idetape_increase_max_pipeline_stages(drive);
1696 ide_end_drive_cmd(drive, 0, 0);
1697 // blkdev_dequeue_request(rq);
1698 // drive->rq = NULL;
1699 // end_that_request_last(rq);
1702 idetape_remove_stage_head(drive);
1703 if (tape->active_data_request == NULL)
1704 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1705 spin_unlock_irqrestore(&tape->spinlock, flags);
1709 static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
1711 idetape_tape_t *tape = drive->driver_data;
1713 #if IDETAPE_DEBUG_LOG
1714 if (tape->debug_level >= 4)
1715 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
1716 #endif /* IDETAPE_DEBUG_LOG */
1717 if (!tape->pc->error) {
1718 idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer);
1719 idetape_end_request(drive, 1, 0);
1721 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1722 idetape_end_request(drive, 0, 0);
1727 static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
1729 idetape_init_pc(pc);
1730 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
1732 pc->request_transfer = 20;
1733 pc->callback = &idetape_request_sense_callback;
1736 static void idetape_init_rq(struct request *rq, u8 cmd)
1738 memset(rq, 0, sizeof(*rq));
1739 rq->flags = REQ_SPECIAL;
1744 * idetape_queue_pc_head generates a new packet command request in front
1745 * of the request queue, before the current request, so that it will be
1746 * processed immediately, on the next pass through the driver.
1748 * idetape_queue_pc_head is called from the request handling part of
1749 * the driver (the "bottom" part). Safe storage for the request should
1750 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1751 * before calling idetape_queue_pc_head.
1753 * Memory for those requests is pre-allocated at initialization time, and
1754 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1755 * space for the maximum possible number of inter-dependent packet commands.
1757 * The higher level of the driver - The ioctl handler and the character
1758 * device handling functions should queue request to the lower level part
1759 * and wait for their completion using idetape_queue_pc_tail or
1760 * idetape_queue_rw_tail.
1762 static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
1764 idetape_init_rq(rq, REQ_IDETAPE_PC1);
1765 rq->buffer = (char *) pc;
1766 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
1770 * idetape_retry_pc is called when an error was detected during the
1771 * last packet command. We queue a request sense packet command in
1772 * the head of the request list.
1774 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
1776 idetape_tape_t *tape = drive->driver_data;
1779 atapi_error_t error;
1781 error.all = HWIF(drive)->INB(IDE_ERROR_REG);
1782 pc = idetape_next_pc_storage(drive);
1783 rq = idetape_next_rq_storage(drive);
1784 idetape_create_request_sense_cmd(pc);
1785 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1786 idetape_queue_pc_head(drive, pc, rq);
1791 * idetape_postpone_request postpones the current request so that
1792 * ide.c will be able to service requests from another device on
1793 * the same hwgroup while we are polling for DSC.
1795 static void idetape_postpone_request (ide_drive_t *drive)
1797 idetape_tape_t *tape = drive->driver_data;
1799 #if IDETAPE_DEBUG_LOG
1800 if (tape->debug_level >= 4)
1801 printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
1803 tape->postponed_rq = HWGROUP(drive)->rq;
1804 ide_stall_queue(drive, tape->dsc_polling_frequency);
1808 * idetape_pc_intr is the usual interrupt handler which will be called
1809 * during a packet command. We will transfer some of the data (as
1810 * requested by the drive) and will re-point interrupt handler to us.
1811 * When data transfer is finished, we will act according to the
1812 * algorithm described before idetape_issue_packet_command.
1815 static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
1817 ide_hwif_t *hwif = drive->hwif;
1818 idetape_tape_t *tape = drive->driver_data;
1819 atapi_status_t status;
1820 atapi_bcount_t bcount;
1821 atapi_ireason_t ireason;
1822 idetape_pc_t *pc = tape->pc;
1826 static int error_sim_count = 0;
1829 #if IDETAPE_DEBUG_LOG
1830 if (tape->debug_level >= 4)
1831 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
1832 "interrupt handler\n");
1833 #endif /* IDETAPE_DEBUG_LOG */
1835 /* Clear the interrupt */
1836 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
1838 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1839 if (HWIF(drive)->ide_dma_end(drive) || status.b.check) {
1841 * A DMA error is sometimes expected. For example,
1842 * if the tape is crossing a filemark during a
1843 * READ command, it will issue an irq and position
1844 * itself before the filemark, so that only a partial
1845 * data transfer will occur (which causes the DMA
1846 * error). In that case, we will later ask the tape
1847 * how much bytes of the original request were
1848 * actually transferred (we can't receive that
1849 * information from the DMA engine on most chipsets).
1853 * On the contrary, a DMA error is never expected;
1854 * it usually indicates a hardware error or abort.
1855 * If the tape crosses a filemark during a READ
1856 * command, it will issue an irq and position itself
1857 * after the filemark (not before). Only a partial
1858 * data transfer will occur, but no DMA error.
1861 set_bit(PC_DMA_ERROR, &pc->flags);
1863 pc->actually_transferred = pc->request_transfer;
1864 idetape_update_buffers(pc);
1866 #if IDETAPE_DEBUG_LOG
1867 if (tape->debug_level >= 4)
1868 printk(KERN_INFO "ide-tape: DMA finished\n");
1869 #endif /* IDETAPE_DEBUG_LOG */
1872 /* No more interrupts */
1873 if (!status.b.drq) {
1874 #if IDETAPE_DEBUG_LOG
1875 if (tape->debug_level >= 2)
1876 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
1877 #endif /* IDETAPE_DEBUG_LOG */
1878 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1883 if ((pc->c[0] == IDETAPE_WRITE_CMD ||
1884 pc->c[0] == IDETAPE_READ_CMD) &&
1885 (++error_sim_count % 100) == 0) {
1886 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1891 if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
1893 if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) { /* Error detected */
1894 #if IDETAPE_DEBUG_LOG
1895 if (tape->debug_level >= 1)
1896 printk(KERN_INFO "ide-tape: %s: I/O error\n",
1898 #endif /* IDETAPE_DEBUG_LOG */
1899 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1900 printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
1901 return ide_do_reset(drive);
1903 #if IDETAPE_DEBUG_LOG
1904 if (tape->debug_level >= 1)
1905 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
1907 /* Retry operation */
1908 return idetape_retry_pc(drive);
1911 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
1913 /* Media access command */
1914 tape->dsc_polling_start = jiffies;
1915 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
1916 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1917 /* Allow ide.c to handle other requests */
1918 idetape_postpone_request(drive);
1921 if (tape->failed_pc == pc)
1922 tape->failed_pc = NULL;
1923 /* Command finished - Call the callback function */
1924 return pc->callback(drive);
1926 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1927 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1928 "interrupts in DMA mode\n");
1929 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
1930 (void)__ide_dma_off(drive);
1931 return ide_do_reset(drive);
1933 /* Get the number of bytes to transfer on this interrupt. */
1934 bcount.b.high = hwif->INB(IDE_BCOUNTH_REG);
1935 bcount.b.low = hwif->INB(IDE_BCOUNTL_REG);
1937 ireason.all = hwif->INB(IDE_IREASON_REG);
1939 if (ireason.b.cod) {
1940 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
1941 return ide_do_reset(drive);
1943 if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
1944 /* Hopefully, we will never get here */
1945 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1946 ireason.b.io ? "Write":"Read");
1947 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1948 ireason.b.io ? "Read":"Write");
1949 return ide_do_reset(drive);
1951 if (!test_bit(PC_WRITING, &pc->flags)) {
1952 /* Reading - Check that we have enough space */
1953 temp = pc->actually_transferred + bcount.all;
1954 if (temp > pc->request_transfer) {
1955 if (temp > pc->buffer_size) {
1956 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
1957 idetape_discard_data(drive, bcount.all);
1958 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1961 #if IDETAPE_DEBUG_LOG
1962 if (tape->debug_level >= 2)
1963 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1964 #endif /* IDETAPE_DEBUG_LOG */
1967 if (test_bit(PC_WRITING, &pc->flags)) {
1969 idetape_output_buffers(drive, pc, bcount.all);
1971 /* Write the current buffer */
1972 HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
1975 idetape_input_buffers(drive, pc, bcount.all);
1977 /* Read the current buffer */
1978 HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
1980 /* Update the current position */
1981 pc->actually_transferred += bcount.all;
1982 pc->current_position += bcount.all;
1983 #if IDETAPE_DEBUG_LOG
1984 if (tape->debug_level >= 2)
1985 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all);
1987 /* And set the interrupt handler again */
1988 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1993 * Packet Command Interface
1995 * The current Packet Command is available in tape->pc, and will not
1996 * change until we finish handling it. Each packet command is associated
1997 * with a callback function that will be called when the command is
2000 * The handling will be done in three stages:
2002 * 1. idetape_issue_packet_command will send the packet command to the
2003 * drive, and will set the interrupt handler to idetape_pc_intr.
2005 * 2. On each interrupt, idetape_pc_intr will be called. This step
2006 * will be repeated until the device signals us that no more
2007 * interrupts will be issued.
2009 * 3. ATAPI Tape media access commands have immediate status with a
2010 * delayed process. In case of a successful initiation of a
2011 * media access packet command, the DSC bit will be set when the
2012 * actual execution of the command is finished.
2013 * Since the tape drive will not issue an interrupt, we have to
2014 * poll for this event. In this case, we define the request as
2015 * "low priority request" by setting rq_status to
2016 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
2019 * ide.c will then give higher priority to requests which
2020 * originate from the other device, until will change rq_status
2023 * 4. When the packet command is finished, it will be checked for errors.
2025 * 5. In case an error was found, we queue a request sense packet
2026 * command in front of the request queue and retry the operation
2027 * up to IDETAPE_MAX_PC_RETRIES times.
2029 * 6. In case no error was found, or we decided to give up and not
2030 * to retry again, the callback function will be called and then
2031 * we will handle the next request.
2034 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
2036 ide_hwif_t *hwif = drive->hwif;
2037 idetape_tape_t *tape = drive->driver_data;
2038 idetape_pc_t *pc = tape->pc;
2039 atapi_ireason_t ireason;
2041 ide_startstop_t startstop;
2043 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
2044 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
2047 ireason.all = hwif->INB(IDE_IREASON_REG);
2048 while (retries-- && (!ireason.b.cod || ireason.b.io)) {
2049 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
2050 "a packet command, retrying\n");
2052 ireason.all = hwif->INB(IDE_IREASON_REG);
2054 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
2055 "issuing a packet command, ignoring\n");
2060 if (!ireason.b.cod || ireason.b.io) {
2061 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
2062 "a packet command\n");
2063 return ide_do_reset(drive);
2065 /* Set the interrupt routine */
2066 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2067 #ifdef CONFIG_BLK_DEV_IDEDMA
2068 /* Begin DMA, if necessary */
2069 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
2070 hwif->dma_start(drive);
2072 /* Send the actual packet */
2073 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
2077 static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
2079 ide_hwif_t *hwif = drive->hwif;
2080 idetape_tape_t *tape = drive->driver_data;
2081 atapi_bcount_t bcount;
2084 #if IDETAPE_DEBUG_BUGS
2085 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD &&
2086 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2087 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
2088 "Two request sense in serial were issued\n");
2090 #endif /* IDETAPE_DEBUG_BUGS */
2092 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
2093 tape->failed_pc = pc;
2094 /* Set the current packet command */
2097 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
2098 test_bit(PC_ABORT, &pc->flags)) {
2100 * We will "abort" retrying a packet command in case
2101 * a legitimate error code was received (crossing a
2102 * filemark, or end of the media, for example).
2104 if (!test_bit(PC_ABORT, &pc->flags)) {
2105 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD &&
2106 tape->sense_key == 2 && tape->asc == 4 &&
2107 (tape->ascq == 1 || tape->ascq == 8))) {
2108 printk(KERN_ERR "ide-tape: %s: I/O error, "
2109 "pc = %2x, key = %2x, "
2110 "asc = %2x, ascq = %2x\n",
2111 tape->name, pc->c[0],
2112 tape->sense_key, tape->asc,
2116 pc->error = IDETAPE_ERROR_GENERAL;
2118 tape->failed_pc = NULL;
2119 return pc->callback(drive);
2121 #if IDETAPE_DEBUG_LOG
2122 if (tape->debug_level >= 2)
2123 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
2124 #endif /* IDETAPE_DEBUG_LOG */
2127 /* We haven't transferred any data yet */
2128 pc->actually_transferred = 0;
2129 pc->current_position = pc->buffer;
2130 /* Request to transfer the entire buffer at once */
2131 bcount.all = pc->request_transfer;
2133 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
2134 printk(KERN_WARNING "ide-tape: DMA disabled, "
2135 "reverting to PIO\n");
2136 (void)__ide_dma_off(drive);
2138 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
2139 dma_ok = !hwif->dma_setup(drive);
2141 if (IDE_CONTROL_REG)
2142 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
2143 hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */
2144 hwif->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
2145 hwif->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
2146 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
2147 if (dma_ok) /* Will begin DMA later */
2148 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
2149 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
2150 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL);
2151 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2154 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2155 return idetape_transfer_pc(drive);
2160 * General packet command callback function.
2162 static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
2164 idetape_tape_t *tape = drive->driver_data;
2166 #if IDETAPE_DEBUG_LOG
2167 if (tape->debug_level >= 4)
2168 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
2169 #endif /* IDETAPE_DEBUG_LOG */
2171 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
2176 * A mode sense command is used to "sense" tape parameters.
2178 static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
2180 idetape_init_pc(pc);
2181 pc->c[0] = IDETAPE_MODE_SENSE_CMD;
2182 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
2183 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
2184 pc->c[2] = page_code;
2186 * Changed pc->c[3] to 0 (255 will at best return unused info).
2188 * For SCSI this byte is defined as subpage instead of high byte
2189 * of length and some IDE drives seem to interpret it this way
2190 * and return an error when 255 is used.
2193 pc->c[4] = 255; /* (We will just discard data in that case) */
2194 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
2195 pc->request_transfer = 12;
2196 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
2197 pc->request_transfer = 24;
2199 pc->request_transfer = 50;
2200 pc->callback = &idetape_pc_callback;
2203 static void calculate_speeds(ide_drive_t *drive)
2205 idetape_tape_t *tape = drive->driver_data;
2206 int full = 125, empty = 75;
2208 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
2209 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
2210 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
2211 tape->controlled_last_pipeline_head = tape->pipeline_head;
2212 tape->controlled_pipeline_head_time = jiffies;
2214 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
2215 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
2216 else if (time_after(jiffies, tape->controlled_previous_head_time))
2217 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
2219 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
2220 /* -1 for read mode error recovery */
2221 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
2222 tape->uncontrolled_pipeline_head_time = jiffies;
2223 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
2226 tape->uncontrolled_previous_head_time = jiffies;
2227 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
2228 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
2229 tape->uncontrolled_pipeline_head_time = jiffies;
2232 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
2233 if (tape->speed_control == 0) {
2234 tape->max_insert_speed = 5000;
2235 } else if (tape->speed_control == 1) {
2236 if (tape->nr_pending_stages >= tape->max_stages / 2)
2237 tape->max_insert_speed = tape->pipeline_head_speed +
2238 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
2240 tape->max_insert_speed = 500 +
2241 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
2242 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
2243 tape->max_insert_speed = 5000;
2244 } else if (tape->speed_control == 2) {
2245 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
2246 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
2248 tape->max_insert_speed = tape->speed_control;
2249 tape->max_insert_speed = max(tape->max_insert_speed, 500);
2252 static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
2254 idetape_tape_t *tape = drive->driver_data;
2255 idetape_pc_t *pc = tape->pc;
2256 atapi_status_t status;
2258 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
2260 if (status.b.check) {
2261 /* Error detected */
2262 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
2263 printk(KERN_ERR "ide-tape: %s: I/O error, ",
2265 /* Retry operation */
2266 return idetape_retry_pc(drive);
2269 if (tape->failed_pc == pc)
2270 tape->failed_pc = NULL;
2272 pc->error = IDETAPE_ERROR_GENERAL;
2273 tape->failed_pc = NULL;
2275 return pc->callback(drive);
2278 static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
2280 idetape_tape_t *tape = drive->driver_data;
2281 struct request *rq = HWGROUP(drive)->rq;
2282 int blocks = tape->pc->actually_transferred / tape->tape_block_size;
2284 tape->avg_size += blocks * tape->tape_block_size;
2285 tape->insert_size += blocks * tape->tape_block_size;
2286 if (tape->insert_size > 1024 * 1024)
2287 tape->measure_insert_time = 1;
2288 if (tape->measure_insert_time) {
2289 tape->measure_insert_time = 0;
2290 tape->insert_time = jiffies;
2291 tape->insert_size = 0;
2293 if (time_after(jiffies, tape->insert_time))
2294 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2295 if (jiffies - tape->avg_time >= HZ) {
2296 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
2298 tape->avg_time = jiffies;
2301 #if IDETAPE_DEBUG_LOG
2302 if (tape->debug_level >= 4)
2303 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
2304 #endif /* IDETAPE_DEBUG_LOG */
2306 tape->first_frame_position += blocks;
2307 rq->current_nr_sectors -= blocks;
2309 if (!tape->pc->error)
2310 idetape_end_request(drive, 1, 0);
2312 idetape_end_request(drive, tape->pc->error, 0);
2316 static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2318 idetape_init_pc(pc);
2319 pc->c[0] = IDETAPE_READ_CMD;
2320 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2322 pc->callback = &idetape_rw_callback;
2324 atomic_set(&bh->b_count, 0);
2326 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2327 if (pc->request_transfer == tape->stage_size)
2328 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2331 static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2334 struct idetape_bh *p = bh;
2336 idetape_init_pc(pc);
2337 pc->c[0] = IDETAPE_READ_BUFFER_CMD;
2338 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
2339 pc->c[7] = size >> 8;
2340 pc->c[8] = size & 0xff;
2341 pc->callback = &idetape_pc_callback;
2343 atomic_set(&bh->b_count, 0);
2346 atomic_set(&p->b_count, 0);
2349 pc->request_transfer = pc->buffer_size = size;
2352 static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2354 idetape_init_pc(pc);
2355 pc->c[0] = IDETAPE_WRITE_CMD;
2356 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2358 pc->callback = &idetape_rw_callback;
2359 set_bit(PC_WRITING, &pc->flags);
2361 pc->b_data = bh->b_data;
2362 pc->b_count = atomic_read(&bh->b_count);
2364 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2365 if (pc->request_transfer == tape->stage_size)
2366 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2370 * idetape_do_request is our request handling function.
2372 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
2373 struct request *rq, sector_t block)
2375 idetape_tape_t *tape = drive->driver_data;
2376 idetape_pc_t *pc = NULL;
2377 struct request *postponed_rq = tape->postponed_rq;
2378 atapi_status_t status;
2380 #if IDETAPE_DEBUG_LOG
2382 if (tape->debug_level >= 5)
2383 printk(KERN_INFO "ide-tape: rq_status: %d, "
2384 "dev: %s, cmd: %ld, errors: %d\n", rq->rq_status,
2385 rq->rq_disk->disk_name, rq->cmd[0], rq->errors);
2387 if (tape->debug_level >= 2)
2388 printk(KERN_INFO "ide-tape: sector: %ld, "
2389 "nr_sectors: %ld, current_nr_sectors: %d\n",
2390 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
2391 #endif /* IDETAPE_DEBUG_LOG */
2393 if ((rq->flags & REQ_SPECIAL) == 0) {
2395 * We do not support buffer cache originated requests.
2397 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
2398 "request queue (%ld)\n", drive->name, rq->flags);
2399 ide_end_request(drive, 0, 0);
2404 * Retry a failed packet command
2406 if (tape->failed_pc != NULL &&
2407 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2408 return idetape_issue_packet_command(drive, tape->failed_pc);
2410 #if IDETAPE_DEBUG_BUGS
2411 if (postponed_rq != NULL)
2412 if (rq != postponed_rq) {
2413 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
2414 "Two DSC requests were queued\n");
2415 idetape_end_request(drive, 0, 0);
2418 #endif /* IDETAPE_DEBUG_BUGS */
2420 tape->postponed_rq = NULL;
2423 * If the tape is still busy, postpone our request and service
2424 * the other device meanwhile.
2426 status.all = HWIF(drive)->INB(IDE_STATUS_REG);
2428 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
2429 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
2431 if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
2432 tape->measure_insert_time = 1;
2433 if (time_after(jiffies, tape->insert_time))
2434 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2435 calculate_speeds(drive);
2436 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
2438 if (postponed_rq == NULL) {
2439 tape->dsc_polling_start = jiffies;
2440 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
2441 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
2442 } else if (time_after(jiffies, tape->dsc_timeout)) {
2443 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
2445 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2446 idetape_media_access_finished(drive);
2449 return ide_do_reset(drive);
2451 } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD)
2452 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
2453 idetape_postpone_request(drive);
2456 if (rq->cmd[0] & REQ_IDETAPE_READ) {
2457 tape->buffer_head++;
2459 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
2461 tape->postpone_cnt = 0;
2462 pc = idetape_next_pc_storage(drive);
2463 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2466 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
2467 tape->buffer_head++;
2469 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
2471 tape->postpone_cnt = 0;
2472 pc = idetape_next_pc_storage(drive);
2473 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2476 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
2477 tape->postpone_cnt = 0;
2478 pc = idetape_next_pc_storage(drive);
2479 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2482 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
2483 pc = (idetape_pc_t *) rq->buffer;
2484 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
2485 rq->cmd[0] |= REQ_IDETAPE_PC2;
2488 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2489 idetape_media_access_finished(drive);
2494 return idetape_issue_packet_command(drive, pc);
2498 * Pipeline related functions
2500 static inline int idetape_pipeline_active (idetape_tape_t *tape)
2504 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2505 rc2 = (tape->active_data_request != NULL);
2510 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
2511 * stage, along with all the necessary small buffers which together make
2512 * a buffer of size tape->stage_size (or a bit more). We attempt to
2513 * combine sequential pages as much as possible.
2515 * Returns a pointer to the new allocated stage, or NULL if we
2516 * can't (or don't want to) allocate a stage.
2518 * Pipeline stages are optional and are used to increase performance.
2519 * If we can't allocate them, we'll manage without them.
2521 static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
2523 idetape_stage_t *stage;
2524 struct idetape_bh *prev_bh, *bh;
2525 int pages = tape->pages_per_stage;
2526 char *b_data = NULL;
2528 if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
2532 bh = stage->bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
2535 bh->b_reqnext = NULL;
2536 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2539 memset(bh->b_data, 0, PAGE_SIZE);
2540 bh->b_size = PAGE_SIZE;
2541 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2544 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2547 memset(b_data, 0, PAGE_SIZE);
2548 if (bh->b_data == b_data + PAGE_SIZE) {
2549 bh->b_size += PAGE_SIZE;
2550 bh->b_data -= PAGE_SIZE;
2552 atomic_add(PAGE_SIZE, &bh->b_count);
2555 if (b_data == bh->b_data + bh->b_size) {
2556 bh->b_size += PAGE_SIZE;
2558 atomic_add(PAGE_SIZE, &bh->b_count);
2562 if ((bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
2563 free_page((unsigned long) b_data);
2566 bh->b_reqnext = NULL;
2567 bh->b_data = b_data;
2568 bh->b_size = PAGE_SIZE;
2569 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2570 prev_bh->b_reqnext = bh;
2572 bh->b_size -= tape->excess_bh_size;
2574 atomic_sub(tape->excess_bh_size, &bh->b_count);
2577 __idetape_kfree_stage(stage);
2581 static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
2583 idetape_stage_t *cache_stage = tape->cache_stage;
2585 #if IDETAPE_DEBUG_LOG
2586 if (tape->debug_level >= 4)
2587 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
2588 #endif /* IDETAPE_DEBUG_LOG */
2590 if (tape->nr_stages >= tape->max_stages)
2592 if (cache_stage != NULL) {
2593 tape->cache_stage = NULL;
2596 return __idetape_kmalloc_stage(tape, 0, 0);
2599 static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
2601 struct idetape_bh *bh = tape->bh;
2605 #if IDETAPE_DEBUG_BUGS
2607 printk(KERN_ERR "ide-tape: bh == NULL in "
2608 "idetape_copy_stage_from_user\n");
2611 #endif /* IDETAPE_DEBUG_BUGS */
2612 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
2613 copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count);
2615 atomic_add(count, &bh->b_count);
2617 if (atomic_read(&bh->b_count) == bh->b_size) {
2620 atomic_set(&bh->b_count, 0);
2626 static void idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
2628 struct idetape_bh *bh = tape->bh;
2632 #if IDETAPE_DEBUG_BUGS
2634 printk(KERN_ERR "ide-tape: bh == NULL in "
2635 "idetape_copy_stage_to_user\n");
2638 #endif /* IDETAPE_DEBUG_BUGS */
2639 count = min(tape->b_count, n);
2640 copy_to_user(buf, tape->b_data, count);
2642 tape->b_data += count;
2643 tape->b_count -= count;
2645 if (!tape->b_count) {
2646 tape->bh = bh = bh->b_reqnext;
2648 tape->b_data = bh->b_data;
2649 tape->b_count = atomic_read(&bh->b_count);
2655 static void idetape_init_merge_stage (idetape_tape_t *tape)
2657 struct idetape_bh *bh = tape->merge_stage->bh;
2660 if (tape->chrdev_direction == idetape_direction_write)
2661 atomic_set(&bh->b_count, 0);
2663 tape->b_data = bh->b_data;
2664 tape->b_count = atomic_read(&bh->b_count);
2668 static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
2670 struct idetape_bh *tmp;
2673 stage->bh = tape->merge_stage->bh;
2674 tape->merge_stage->bh = tmp;
2675 idetape_init_merge_stage(tape);
2679 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2681 static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
2683 idetape_tape_t *tape = drive->driver_data;
2684 unsigned long flags;
2686 #if IDETAPE_DEBUG_LOG
2687 if (tape->debug_level >= 4)
2688 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
2689 #endif /* IDETAPE_DEBUG_LOG */
2690 spin_lock_irqsave(&tape->spinlock, flags);
2692 if (tape->last_stage != NULL)
2693 tape->last_stage->next=stage;
2695 tape->first_stage = tape->next_stage=stage;
2696 tape->last_stage = stage;
2697 if (tape->next_stage == NULL)
2698 tape->next_stage = tape->last_stage;
2700 tape->nr_pending_stages++;
2701 spin_unlock_irqrestore(&tape->spinlock, flags);
2705 * idetape_wait_for_request installs a completion in a pending request
2706 * and sleeps until it is serviced.
2708 * The caller should ensure that the request will not be serviced
2709 * before we install the completion (usually by disabling interrupts).
2711 static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
2713 DECLARE_COMPLETION(wait);
2714 idetape_tape_t *tape = drive->driver_data;
2716 #if IDETAPE_DEBUG_BUGS
2717 if (rq == NULL || (rq->flags & REQ_SPECIAL) == 0) {
2718 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
2721 #endif /* IDETAPE_DEBUG_BUGS */
2722 rq->waiting = &wait;
2723 spin_unlock_irq(&tape->spinlock);
2724 wait_for_completion(&wait);
2725 /* The stage and its struct request have been deallocated */
2726 spin_lock_irq(&tape->spinlock);
2729 static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
2731 idetape_tape_t *tape = drive->driver_data;
2732 idetape_read_position_result_t *result;
2734 #if IDETAPE_DEBUG_LOG
2735 if (tape->debug_level >= 4)
2736 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
2737 #endif /* IDETAPE_DEBUG_LOG */
2739 if (!tape->pc->error) {
2740 result = (idetape_read_position_result_t *) tape->pc->buffer;
2741 #if IDETAPE_DEBUG_LOG
2742 if (tape->debug_level >= 2)
2743 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
2744 if (tape->debug_level >= 2)
2745 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
2746 #endif /* IDETAPE_DEBUG_LOG */
2748 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
2749 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2750 idetape_end_request(drive, 0, 0);
2752 #if IDETAPE_DEBUG_LOG
2753 if (tape->debug_level >= 2)
2754 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
2755 #endif /* IDETAPE_DEBUG_LOG */
2756 tape->partition = result->partition;
2757 tape->first_frame_position = ntohl(result->first_block);
2758 tape->last_frame_position = ntohl(result->last_block);
2759 tape->blocks_in_buffer = result->blocks_in_buffer[2];
2760 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2761 idetape_end_request(drive, 1, 0);
2764 idetape_end_request(drive, 0, 0);
2770 * idetape_create_write_filemark_cmd will:
2772 * 1. Write a filemark if write_filemark=1.
2773 * 2. Flush the device buffers without writing a filemark
2774 * if write_filemark=0.
2777 static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2779 idetape_init_pc(pc);
2780 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
2781 pc->c[4] = write_filemark;
2782 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2783 pc->callback = &idetape_pc_callback;
2786 static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2788 idetape_init_pc(pc);
2789 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
2790 pc->callback = &idetape_pc_callback;
2794 * idetape_queue_pc_tail is based on the following functions:
2796 * ide_do_drive_cmd from ide.c
2797 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2799 * We add a special packet command request to the tail of the request
2800 * queue, and wait for it to be serviced.
2802 * This is not to be called from within the request handling part
2803 * of the driver ! We allocate here data in the stack, and it is valid
2804 * until the request is finished. This is not the case for the bottom
2805 * part of the driver, where we are always leaving the functions to wait
2806 * for an interrupt or a timer event.
2808 * From the bottom part of the driver, we should allocate safe memory
2809 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2810 * the request to the request list without waiting for it to be serviced !
2811 * In that case, we usually use idetape_queue_pc_head.
2813 static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2817 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2818 rq.buffer = (char *) pc;
2819 return ide_do_drive_cmd(drive, &rq, ide_wait);
2822 static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2824 idetape_init_pc(pc);
2825 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
2827 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2828 pc->callback = &idetape_pc_callback;
2831 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2833 idetape_tape_t *tape = drive->driver_data;
2835 int load_attempted = 0;
2838 * Wait for the tape to become ready
2840 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2842 while (time_before(jiffies, timeout)) {
2843 idetape_create_test_unit_ready_cmd(&pc);
2844 if (!__idetape_queue_pc_tail(drive, &pc))
2846 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2847 || (tape->asc == 0x3A)) { /* no media */
2850 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2851 __idetape_queue_pc_tail(drive, &pc);
2853 /* not about to be ready */
2854 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2855 (tape->ascq == 1 || tape->ascq == 8)))
2857 current->state = TASK_INTERRUPTIBLE;
2858 schedule_timeout(HZ / 10);
2863 static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2865 return __idetape_queue_pc_tail(drive, pc);
2868 static int idetape_flush_tape_buffers (ide_drive_t *drive)
2873 idetape_create_write_filemark_cmd(drive, &pc, 0);
2874 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2876 idetape_wait_ready(drive, 60 * 5 * HZ);
2880 static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2882 idetape_init_pc(pc);
2883 pc->c[0] = IDETAPE_READ_POSITION_CMD;
2884 pc->request_transfer = 20;
2885 pc->callback = &idetape_read_position_callback;
2888 static int idetape_read_position (ide_drive_t *drive)
2890 idetape_tape_t *tape = drive->driver_data;
2894 #if IDETAPE_DEBUG_LOG
2895 if (tape->debug_level >= 4)
2896 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
2897 #endif /* IDETAPE_DEBUG_LOG */
2899 idetape_create_read_position_cmd(&pc);
2900 if (idetape_queue_pc_tail(drive, &pc))
2902 position = tape->first_frame_position;
2906 static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2908 idetape_init_pc(pc);
2909 pc->c[0] = IDETAPE_LOCATE_CMD;
2911 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]);
2912 pc->c[8] = partition;
2913 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2914 pc->callback = &idetape_pc_callback;
2917 static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2919 idetape_tape_t *tape = drive->driver_data;
2921 if (!tape->capabilities.lock)
2924 idetape_init_pc(pc);
2925 pc->c[0] = IDETAPE_PREVENT_CMD;
2927 pc->callback = &idetape_pc_callback;
2931 static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2933 idetape_tape_t *tape = drive->driver_data;
2934 unsigned long flags;
2937 if (tape->chrdev_direction != idetape_direction_read)
2940 /* Remove merge stage. */
2941 cnt = tape->merge_stage_size / tape->tape_block_size;
2942 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2943 ++cnt; /* Filemarks count as 1 sector */
2944 tape->merge_stage_size = 0;
2945 if (tape->merge_stage != NULL) {
2946 __idetape_kfree_stage(tape->merge_stage);
2947 tape->merge_stage = NULL;
2950 /* Clear pipeline flags. */
2951 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2952 tape->chrdev_direction = idetape_direction_none;
2954 /* Remove pipeline stages. */
2955 if (tape->first_stage == NULL)
2958 spin_lock_irqsave(&tape->spinlock, flags);
2959 tape->next_stage = NULL;
2960 if (idetape_pipeline_active(tape))
2961 idetape_wait_for_request(drive, tape->active_data_request);
2962 spin_unlock_irqrestore(&tape->spinlock, flags);
2964 while (tape->first_stage != NULL) {
2965 struct request *rq_ptr = &tape->first_stage->rq;
2967 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
2968 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
2970 idetape_remove_stage_head(drive);
2972 tape->nr_pending_stages = 0;
2973 tape->max_stages = tape->min_pipeline;
2978 * idetape_position_tape positions the tape to the requested block
2979 * using the LOCATE packet command. A READ POSITION command is then
2980 * issued to check where we are positioned.
2982 * Like all higher level operations, we queue the commands at the tail
2983 * of the request queue and wait for their completion.
2986 static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
2988 idetape_tape_t *tape = drive->driver_data;
2992 if (tape->chrdev_direction == idetape_direction_read)
2993 __idetape_discard_read_pipeline(drive);
2994 idetape_wait_ready(drive, 60 * 5 * HZ);
2995 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
2996 retval = idetape_queue_pc_tail(drive, &pc);
3000 idetape_create_read_position_cmd(&pc);
3001 return (idetape_queue_pc_tail(drive, &pc));
3004 static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
3006 idetape_tape_t *tape = drive->driver_data;
3010 cnt = __idetape_discard_read_pipeline(drive);
3011 if (restore_position) {
3012 position = idetape_read_position(drive);
3013 seek = position > cnt ? position - cnt : 0;
3014 if (idetape_position_tape(drive, seek, 0, 0)) {
3015 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
3022 * idetape_queue_rw_tail generates a read/write request for the block
3023 * device interface and wait for it to be serviced.
3025 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
3027 idetape_tape_t *tape = drive->driver_data;
3030 #if IDETAPE_DEBUG_LOG
3031 if (tape->debug_level >= 2)
3032 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
3033 #endif /* IDETAPE_DEBUG_LOG */
3034 #if IDETAPE_DEBUG_BUGS
3035 if (idetape_pipeline_active(tape)) {
3036 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
3039 #endif /* IDETAPE_DEBUG_BUGS */
3041 idetape_init_rq(&rq, cmd);
3042 rq.special = (void *)bh;
3043 rq.sector = tape->first_frame_position;
3044 rq.nr_sectors = rq.current_nr_sectors = blocks;
3045 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
3047 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
3050 if (tape->merge_stage)
3051 idetape_init_merge_stage(tape);
3052 if (rq.errors == IDETAPE_ERROR_GENERAL)
3054 return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
3058 * idetape_insert_pipeline_into_queue is used to start servicing the
3059 * pipeline stages, starting from tape->next_stage.
3061 static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
3063 idetape_tape_t *tape = drive->driver_data;
3065 if (tape->next_stage == NULL)
3067 if (!idetape_pipeline_active(tape)) {
3068 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
3069 idetape_active_next_stage(drive);
3070 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
3074 static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
3076 idetape_init_pc(pc);
3077 pc->c[0] = IDETAPE_INQUIRY_CMD;
3078 pc->c[4] = pc->request_transfer = 254;
3079 pc->callback = &idetape_pc_callback;
3082 static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
3084 idetape_init_pc(pc);
3085 pc->c[0] = IDETAPE_REWIND_CMD;
3086 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3087 pc->callback = &idetape_pc_callback;
3091 static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length)
3093 idetape_init_pc(pc);
3094 set_bit(PC_WRITING, &pc->flags);
3095 pc->c[0] = IDETAPE_MODE_SELECT_CMD;
3097 put_unaligned(htons(length), (unsigned short *) &pc->c[3]);
3098 pc->request_transfer = 255;
3099 pc->callback = &idetape_pc_callback;
3103 static void idetape_create_erase_cmd (idetape_pc_t *pc)
3105 idetape_init_pc(pc);
3106 pc->c[0] = IDETAPE_ERASE_CMD;
3108 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3109 pc->callback = &idetape_pc_callback;
3112 static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
3114 idetape_init_pc(pc);
3115 pc->c[0] = IDETAPE_SPACE_CMD;
3116 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]);
3118 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3119 pc->callback = &idetape_pc_callback;
3122 static void idetape_wait_first_stage (ide_drive_t *drive)
3124 idetape_tape_t *tape = drive->driver_data;
3125 unsigned long flags;
3127 if (tape->first_stage == NULL)
3129 spin_lock_irqsave(&tape->spinlock, flags);
3130 if (tape->active_stage == tape->first_stage)
3131 idetape_wait_for_request(drive, tape->active_data_request);
3132 spin_unlock_irqrestore(&tape->spinlock, flags);
3136 * idetape_add_chrdev_write_request tries to add a character device
3137 * originated write request to our pipeline. In case we don't succeed,
3138 * we revert to non-pipelined operation mode for this request.
3140 * 1. Try to allocate a new pipeline stage.
3141 * 2. If we can't, wait for more and more requests to be serviced
3142 * and try again each time.
3143 * 3. If we still can't allocate a stage, fallback to
3144 * non-pipelined operation mode for this request.
3146 static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
3148 idetape_tape_t *tape = drive->driver_data;
3149 idetape_stage_t *new_stage;
3150 unsigned long flags;
3153 #if IDETAPE_DEBUG_LOG
3154 if (tape->debug_level >= 3)
3155 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
3156 #endif /* IDETAPE_DEBUG_LOG */
3159 * Attempt to allocate a new stage.
3160 * Pay special attention to possible race conditions.
3162 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
3163 spin_lock_irqsave(&tape->spinlock, flags);
3164 if (idetape_pipeline_active(tape)) {
3165 idetape_wait_for_request(drive, tape->active_data_request);
3166 spin_unlock_irqrestore(&tape->spinlock, flags);
3168 spin_unlock_irqrestore(&tape->spinlock, flags);
3169 idetape_insert_pipeline_into_queue(drive);
3170 if (idetape_pipeline_active(tape))
3173 * Linux is short on memory. Fallback to
3174 * non-pipelined operation mode for this request.
3176 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3179 rq = &new_stage->rq;
3180 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
3181 /* Doesn't actually matter - We always assume sequential access */
3182 rq->sector = tape->first_frame_position;
3183 rq->nr_sectors = rq->current_nr_sectors = blocks;
3185 idetape_switch_buffers(tape, new_stage);
3186 idetape_add_stage_tail(drive, new_stage);
3187 tape->pipeline_head++;
3189 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
3191 calculate_speeds(drive);
3194 * Estimate whether the tape has stopped writing by checking
3195 * if our write pipeline is currently empty. If we are not
3196 * writing anymore, wait for the pipeline to be full enough
3197 * (90%) before starting to service requests, so that we will
3198 * be able to keep up with the higher speeds of the tape.
3200 if (!idetape_pipeline_active(tape)) {
3201 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
3202 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
3203 tape->measure_insert_time = 1;
3204 tape->insert_time = jiffies;
3205 tape->insert_size = 0;
3206 tape->insert_speed = 0;
3207 idetape_insert_pipeline_into_queue(drive);
3210 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3211 /* Return a deferred error */
3217 * idetape_wait_for_pipeline will wait until all pending pipeline
3218 * requests are serviced. Typically called on device close.
3220 static void idetape_wait_for_pipeline (ide_drive_t *drive)
3222 idetape_tape_t *tape = drive->driver_data;
3223 unsigned long flags;
3225 while (tape->next_stage || idetape_pipeline_active(tape)) {
3226 idetape_insert_pipeline_into_queue(drive);
3227 spin_lock_irqsave(&tape->spinlock, flags);
3228 if (idetape_pipeline_active(tape))
3229 idetape_wait_for_request(drive, tape->active_data_request);
3230 spin_unlock_irqrestore(&tape->spinlock, flags);
3234 static void idetape_empty_write_pipeline (ide_drive_t *drive)
3236 idetape_tape_t *tape = drive->driver_data;
3238 struct idetape_bh *bh;
3240 #if IDETAPE_DEBUG_BUGS
3241 if (tape->chrdev_direction != idetape_direction_write) {
3242 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
3245 if (tape->merge_stage_size > tape->stage_size) {
3246 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
3247 tape->merge_stage_size = tape->stage_size;
3249 #endif /* IDETAPE_DEBUG_BUGS */
3250 if (tape->merge_stage_size) {
3251 blocks = tape->merge_stage_size / tape->tape_block_size;
3252 if (tape->merge_stage_size % tape->tape_block_size) {
3256 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
3257 bh = tape->bh->b_reqnext;
3259 atomic_set(&bh->b_count, 0);
3266 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
3269 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
3270 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
3271 atomic_add(min, &bh->b_count);
3276 (void) idetape_add_chrdev_write_request(drive, blocks);
3277 tape->merge_stage_size = 0;
3279 idetape_wait_for_pipeline(drive);
3280 if (tape->merge_stage != NULL) {
3281 __idetape_kfree_stage(tape->merge_stage);
3282 tape->merge_stage = NULL;
3284 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3285 tape->chrdev_direction = idetape_direction_none;
3288 * On the next backup, perform the feedback loop again.
3289 * (I don't want to keep sense information between backups,
3290 * as some systems are constantly on, and the system load
3291 * can be totally different on the next backup).
3293 tape->max_stages = tape->min_pipeline;
3294 #if IDETAPE_DEBUG_BUGS
3295 if (tape->first_stage != NULL ||
3296 tape->next_stage != NULL ||
3297 tape->last_stage != NULL ||
3298 tape->nr_stages != 0) {
3299 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
3300 "first_stage %p, next_stage %p, "
3301 "last_stage %p, nr_stages %d\n",
3302 tape->first_stage, tape->next_stage,
3303 tape->last_stage, tape->nr_stages);
3305 #endif /* IDETAPE_DEBUG_BUGS */
3308 static void idetape_restart_speed_control (ide_drive_t *drive)
3310 idetape_tape_t *tape = drive->driver_data;
3312 tape->restart_speed_control_req = 0;
3313 tape->pipeline_head = 0;
3314 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
3315 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
3316 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
3317 tape->uncontrolled_pipeline_head_speed = 0;
3318 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
3319 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
3322 static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
3324 idetape_tape_t *tape = drive->driver_data;
3325 idetape_stage_t *new_stage;
3328 int blocks = tape->capabilities.ctl;
3330 /* Initialize read operation */
3331 if (tape->chrdev_direction != idetape_direction_read) {
3332 if (tape->chrdev_direction == idetape_direction_write) {
3333 idetape_empty_write_pipeline(drive);
3334 idetape_flush_tape_buffers(drive);
3336 #if IDETAPE_DEBUG_BUGS
3337 if (tape->merge_stage || tape->merge_stage_size) {
3338 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
3339 tape->merge_stage_size = 0;
3341 #endif /* IDETAPE_DEBUG_BUGS */
3342 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3344 tape->chrdev_direction = idetape_direction_read;
3347 * Issue a read 0 command to ensure that DSC handshake
3348 * is switched from completion mode to buffer available
3350 * No point in issuing this if DSC overlap isn't supported,
3351 * some drives (Seagate STT3401A) will return an error.
3353 if (drive->dsc_overlap) {
3354 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
3355 if (bytes_read < 0) {
3356 __idetape_kfree_stage(tape->merge_stage);
3357 tape->merge_stage = NULL;
3358 tape->chrdev_direction = idetape_direction_none;
3363 if (tape->restart_speed_control_req)
3364 idetape_restart_speed_control(drive);
3365 idetape_init_rq(&rq, REQ_IDETAPE_READ);
3366 rq.sector = tape->first_frame_position;
3367 rq.nr_sectors = rq.current_nr_sectors = blocks;
3368 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
3369 tape->nr_stages < max_stages) {
3370 new_stage = idetape_kmalloc_stage(tape);
3371 while (new_stage != NULL) {
3373 idetape_add_stage_tail(drive, new_stage);
3374 if (tape->nr_stages >= max_stages)
3376 new_stage = idetape_kmalloc_stage(tape);
3379 if (!idetape_pipeline_active(tape)) {
3380 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
3381 tape->measure_insert_time = 1;
3382 tape->insert_time = jiffies;
3383 tape->insert_size = 0;
3384 tape->insert_speed = 0;
3385 idetape_insert_pipeline_into_queue(drive);
3392 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
3393 * to service a character device read request and add read-ahead
3394 * requests to our pipeline.
3396 static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
3398 idetape_tape_t *tape = drive->driver_data;
3399 unsigned long flags;
3400 struct request *rq_ptr;
3403 #if IDETAPE_DEBUG_LOG
3404 if (tape->debug_level >= 4)
3405 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
3406 #endif /* IDETAPE_DEBUG_LOG */
3409 * If we are at a filemark, return a read length of 0
3411 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
3415 * Wait for the next block to be available at the head
3418 idetape_initiate_read(drive, tape->max_stages);
3419 if (tape->first_stage == NULL) {
3420 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3422 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
3424 idetape_wait_first_stage(drive);
3425 rq_ptr = &tape->first_stage->rq;
3426 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
3427 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
3430 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
3433 idetape_switch_buffers(tape, tape->first_stage);
3434 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3435 set_bit(IDETAPE_FILEMARK, &tape->flags);
3436 spin_lock_irqsave(&tape->spinlock, flags);
3437 idetape_remove_stage_head(drive);
3438 spin_unlock_irqrestore(&tape->spinlock, flags);
3439 tape->pipeline_head++;
3441 IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor);
3443 calculate_speeds(drive);
3445 #if IDETAPE_DEBUG_BUGS
3446 if (bytes_read > blocks * tape->tape_block_size) {
3447 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
3448 bytes_read = blocks * tape->tape_block_size;
3450 #endif /* IDETAPE_DEBUG_BUGS */
3451 return (bytes_read);
3454 static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
3456 idetape_tape_t *tape = drive->driver_data;
3457 struct idetape_bh *bh;
3463 bh = tape->merge_stage->bh;
3464 count = min(tape->stage_size, bcount);
3466 blocks = count / tape->tape_block_size;
3468 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
3469 memset(bh->b_data, 0, atomic_read(&bh->b_count));
3470 count -= atomic_read(&bh->b_count);
3473 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3477 static int idetape_pipeline_size (ide_drive_t *drive)
3479 idetape_tape_t *tape = drive->driver_data;
3480 idetape_stage_t *stage;
3484 idetape_wait_for_pipeline(drive);
3485 stage = tape->first_stage;
3486 while (stage != NULL) {
3488 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
3489 if (rq->errors == IDETAPE_ERROR_FILEMARK)
3490 size += tape->tape_block_size;
3491 stage = stage->next;
3493 size += tape->merge_stage_size;
3498 * Rewinds the tape to the Beginning Of the current Partition (BOP).
3500 * We currently support only one partition.
3502 static int idetape_rewind_tape (ide_drive_t *drive)
3506 #if IDETAPE_DEBUG_LOG
3507 idetape_tape_t *tape = drive->driver_data;
3508 if (tape->debug_level >= 2)
3509 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
3510 #endif /* IDETAPE_DEBUG_LOG */
3512 idetape_create_rewind_cmd(drive, &pc);
3513 retval = idetape_queue_pc_tail(drive, &pc);
3517 idetape_create_read_position_cmd(&pc);
3518 retval = idetape_queue_pc_tail(drive, &pc);
3525 * Our special ide-tape ioctl's.
3527 * Currently there aren't any ioctl's.
3528 * mtio.h compatible commands should be issued to the character device
3531 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
3533 idetape_tape_t *tape = drive->driver_data;
3534 idetape_config_t config;
3535 void __user *argp = (void __user *)arg;
3537 #if IDETAPE_DEBUG_LOG
3538 if (tape->debug_level >= 4)
3539 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
3540 #endif /* IDETAPE_DEBUG_LOG */
3543 if (copy_from_user(&config, argp, sizeof (idetape_config_t)))
3545 tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
3546 tape->max_stages = config.nr_stages;
3549 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
3550 config.nr_stages = tape->max_stages;
3551 if (copy_to_user(argp, &config, sizeof (idetape_config_t)))
3561 * idetape_pre_reset is called before an ATAPI/ATA software reset.
3563 static void idetape_pre_reset (ide_drive_t *drive)
3565 idetape_tape_t *tape = drive->driver_data;
3567 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
3571 * idetape_space_over_filemarks is now a bit more complicated than just
3572 * passing the command to the tape since we may have crossed some
3573 * filemarks during our pipelined read-ahead mode.
3575 * As a minor side effect, the pipeline enables us to support MTFSFM when
3576 * the filemark is in our internal pipeline even if the tape doesn't
3577 * support spacing over filemarks in the reverse direction.
3579 static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
3581 idetape_tape_t *tape = drive->driver_data;
3583 unsigned long flags;
3588 if (MTBSF == mt_op || MTBSFM == mt_op) {
3589 if (!tape->capabilities.sprev)
3591 mt_count = - mt_count;
3594 if (tape->chrdev_direction == idetape_direction_read) {
3596 * We have a read-ahead buffer. Scan it for crossed
3599 tape->merge_stage_size = 0;
3600 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
3602 while (tape->first_stage != NULL) {
3603 if (count == mt_count) {
3604 if (mt_op == MTFSFM)
3605 set_bit(IDETAPE_FILEMARK, &tape->flags);
3608 spin_lock_irqsave(&tape->spinlock, flags);
3609 if (tape->first_stage == tape->active_stage) {
3611 * We have reached the active stage in the read pipeline.
3612 * There is no point in allowing the drive to continue
3613 * reading any farther, so we stop the pipeline.
3615 * This section should be moved to a separate subroutine,
3616 * because a similar function is performed in
3617 * __idetape_discard_read_pipeline(), for example.
3619 tape->next_stage = NULL;
3620 spin_unlock_irqrestore(&tape->spinlock, flags);
3621 idetape_wait_first_stage(drive);
3622 tape->next_stage = tape->first_stage->next;
3624 spin_unlock_irqrestore(&tape->spinlock, flags);
3625 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
3627 idetape_remove_stage_head(drive);
3629 idetape_discard_read_pipeline(drive, 0);
3633 * The filemark was not found in our internal pipeline.
3634 * Now we can issue the space command.
3639 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
3640 return (idetape_queue_pc_tail(drive, &pc));
3643 if (!tape->capabilities.sprev)
3645 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
3646 if (retval) return (retval);
3647 count = (MTBSFM == mt_op ? 1 : -1);
3648 return (idetape_space_over_filemarks(drive, MTFSF, count));
3650 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
3657 * Our character device read / write functions.
3659 * The tape is optimized to maximize throughput when it is transferring
3660 * an integral number of the "continuous transfer limit", which is
3661 * a parameter of the specific tape (26 KB on my particular tape).
3662 * (32 kB for Onstream)
3664 * As of version 1.3 of the driver, the character device provides an
3665 * abstract continuous view of the media - any mix of block sizes (even 1
3666 * byte) on the same backup/restore procedure is supported. The driver
3667 * will internally convert the requests to the recommended transfer unit,
3668 * so that an unmatch between the user's block size to the recommended
3669 * size will only result in a (slightly) increased driver overhead, but
3670 * will no longer hit performance.
3671 * This is not applicable to Onstream.
3673 static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
3674 size_t count, loff_t *ppos)
3676 ide_drive_t *drive = file->private_data;
3677 idetape_tape_t *tape = drive->driver_data;
3678 ssize_t bytes_read,temp, actually_read = 0, rc;
3680 #if IDETAPE_DEBUG_LOG
3681 if (tape->debug_level >= 3)
3682 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
3683 #endif /* IDETAPE_DEBUG_LOG */
3685 if (tape->chrdev_direction != idetape_direction_read) {
3686 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
3687 if (count > tape->tape_block_size &&
3688 (count % tape->tape_block_size) == 0)
3689 tape->user_bs_factor = count / tape->tape_block_size;
3691 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
3695 if (tape->merge_stage_size) {
3696 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
3697 idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read);
3698 buf += actually_read;
3699 tape->merge_stage_size -= actually_read;
3700 count -= actually_read;
3702 while (count >= tape->stage_size) {
3703 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3704 if (bytes_read <= 0)
3706 idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read);
3708 count -= bytes_read;
3709 actually_read += bytes_read;
3712 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3713 if (bytes_read <= 0)
3715 temp = min((unsigned long)count, (unsigned long)bytes_read);
3716 idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp);
3717 actually_read += temp;
3718 tape->merge_stage_size = bytes_read-temp;
3721 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
3722 #if IDETAPE_DEBUG_LOG
3723 if (tape->debug_level >= 2)
3724 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
3726 idetape_space_over_filemarks(drive, MTFSF, 1);
3729 return actually_read;
3732 static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
3733 size_t count, loff_t *ppos)
3735 ide_drive_t *drive = file->private_data;
3736 idetape_tape_t *tape = drive->driver_data;
3737 ssize_t retval, actually_written = 0;
3739 /* The drive is write protected. */
3740 if (tape->write_prot)
3743 #if IDETAPE_DEBUG_LOG
3744 if (tape->debug_level >= 3)
3745 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
3746 "count %Zd\n", count);
3747 #endif /* IDETAPE_DEBUG_LOG */
3749 /* Initialize write operation */
3750 if (tape->chrdev_direction != idetape_direction_write) {
3751 if (tape->chrdev_direction == idetape_direction_read)
3752 idetape_discard_read_pipeline(drive, 1);
3753 #if IDETAPE_DEBUG_BUGS
3754 if (tape->merge_stage || tape->merge_stage_size) {
3755 printk(KERN_ERR "ide-tape: merge_stage_size "
3756 "should be 0 now\n");
3757 tape->merge_stage_size = 0;
3759 #endif /* IDETAPE_DEBUG_BUGS */
3760 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3762 tape->chrdev_direction = idetape_direction_write;
3763 idetape_init_merge_stage(tape);
3766 * Issue a write 0 command to ensure that DSC handshake
3767 * is switched from completion mode to buffer available
3769 * No point in issuing this if DSC overlap isn't supported,
3770 * some drives (Seagate STT3401A) will return an error.
3772 if (drive->dsc_overlap) {
3773 retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
3775 __idetape_kfree_stage(tape->merge_stage);
3776 tape->merge_stage = NULL;
3777 tape->chrdev_direction = idetape_direction_none;
3784 if (tape->restart_speed_control_req)
3785 idetape_restart_speed_control(drive);
3786 if (tape->merge_stage_size) {
3787 #if IDETAPE_DEBUG_BUGS
3788 if (tape->merge_stage_size >= tape->stage_size) {
3789 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
3790 tape->merge_stage_size = 0;
3792 #endif /* IDETAPE_DEBUG_BUGS */
3793 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
3794 idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written);
3795 buf += actually_written;
3796 tape->merge_stage_size += actually_written;
3797 count -= actually_written;
3799 if (tape->merge_stage_size == tape->stage_size) {
3800 tape->merge_stage_size = 0;
3801 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3806 while (count >= tape->stage_size) {
3807 idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size);
3808 buf += tape->stage_size;
3809 count -= tape->stage_size;
3810 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3811 actually_written += tape->stage_size;
3816 actually_written += count;
3817 idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count);
3818 tape->merge_stage_size += count;
3820 return (actually_written);
3823 static int idetape_write_filemark (ide_drive_t *drive)
3827 /* Write a filemark */
3828 idetape_create_write_filemark_cmd(drive, &pc, 1);
3829 if (idetape_queue_pc_tail(drive, &pc)) {
3830 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3837 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3838 * the general mtio MTIOCTOP ioctl is requested.
3840 * We currently support the following mtio.h operations:
3842 * MTFSF - Space over mt_count filemarks in the positive direction.
3843 * The tape is positioned after the last spaced filemark.
3845 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3848 * MTBSF - Steps background over mt_count filemarks, tape is
3849 * positioned before the last filemark.
3851 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3855 * MTBSF and MTBSFM are not supported when the tape doesn't
3856 * support spacing over filemarks in the reverse direction.
3857 * In this case, MTFSFM is also usually not supported (it is
3858 * supported in the rare case in which we crossed the filemark
3859 * during our read-ahead pipelined operation mode).
3861 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3862 * the last written filemark.
3864 * MTREW - Rewinds tape.
3866 * MTLOAD - Loads the tape.
3868 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3869 * MTUNLOAD prevents further access until the media is replaced.
3871 * MTNOP - Flushes tape buffers.
3873 * MTRETEN - Retension media. This typically consists of one end
3874 * to end pass on the media.
3876 * MTEOM - Moves to the end of recorded data.
3878 * MTERASE - Erases tape.
3880 * MTSETBLK - Sets the user block size to mt_count bytes. If
3881 * mt_count is 0, we will attempt to autodetect
3884 * MTSEEK - Positions the tape in a specific block number, where
3885 * each block is assumed to contain which user_block_size
3888 * MTSETPART - Switches to another tape partition.
3890 * MTLOCK - Locks the tape door.
3892 * MTUNLOCK - Unlocks the tape door.
3894 * The following commands are currently not supported:
3896 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3897 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3899 static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
3901 idetape_tape_t *tape = drive->driver_data;
3905 #if IDETAPE_DEBUG_LOG
3906 if (tape->debug_level >= 1)
3907 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
3908 "mt_op=%d, mt_count=%d\n", mt_op, mt_count);
3909 #endif /* IDETAPE_DEBUG_LOG */
3911 * Commands which need our pipelined read-ahead stages.
3920 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
3926 if (tape->write_prot)
3928 idetape_discard_read_pipeline(drive, 1);
3929 for (i = 0; i < mt_count; i++) {
3930 retval = idetape_write_filemark(drive);
3936 idetape_discard_read_pipeline(drive, 0);
3937 if (idetape_rewind_tape(drive))
3941 idetape_discard_read_pipeline(drive, 0);
3942 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
3943 return (idetape_queue_pc_tail(drive, &pc));
3947 * If door is locked, attempt to unlock before
3948 * attempting to eject.
3950 if (tape->door_locked) {
3951 if (idetape_create_prevent_cmd(drive, &pc, 0))
3952 if (!idetape_queue_pc_tail(drive, &pc))
3953 tape->door_locked = DOOR_UNLOCKED;
3955 idetape_discard_read_pipeline(drive, 0);
3956 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
3957 retval = idetape_queue_pc_tail(drive, &pc);
3959 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
3962 idetape_discard_read_pipeline(drive, 0);
3963 return (idetape_flush_tape_buffers(drive));
3965 idetape_discard_read_pipeline(drive, 0);
3966 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
3967 return (idetape_queue_pc_tail(drive, &pc));
3969 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
3970 return (idetape_queue_pc_tail(drive, &pc));
3972 (void) idetape_rewind_tape(drive);
3973 idetape_create_erase_cmd(&pc);
3974 return (idetape_queue_pc_tail(drive, &pc));
3977 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
3979 tape->user_bs_factor = mt_count / tape->tape_block_size;
3980 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
3982 set_bit(IDETAPE_DETECT_BS, &tape->flags);
3985 idetape_discard_read_pipeline(drive, 0);
3986 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
3988 idetape_discard_read_pipeline(drive, 0);
3989 return (idetape_position_tape(drive, 0, mt_count, 0));
3993 if (!idetape_create_prevent_cmd(drive, &pc, 1))
3995 retval = idetape_queue_pc_tail(drive, &pc);
3996 if (retval) return retval;
3997 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
4000 if (!idetape_create_prevent_cmd(drive, &pc, 0))
4002 retval = idetape_queue_pc_tail(drive, &pc);
4003 if (retval) return retval;
4004 tape->door_locked = DOOR_UNLOCKED;
4007 printk(KERN_ERR "ide-tape: MTIO operation %d not "
4008 "supported\n", mt_op);
4014 * Our character device ioctls.
4016 * General mtio.h magnetic io commands are supported here, and not in
4017 * the corresponding block interface.
4019 * The following ioctls are supported:
4021 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
4023 * MTIOCGET - The mt_dsreg field in the returned mtget structure
4024 * will be set to (user block size in bytes <<
4025 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
4027 * The mt_blkno is set to the current user block number.
4028 * The other mtget fields are not supported.
4030 * MTIOCPOS - The current tape "block position" is returned. We
4031 * assume that each block contains user_block_size
4034 * Our own ide-tape ioctls are supported on both interfaces.
4036 static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
4038 ide_drive_t *drive = file->private_data;
4039 idetape_tape_t *tape = drive->driver_data;
4043 int block_offset = 0, position = tape->first_frame_position;
4044 void __user *argp = (void __user *)arg;
4046 #if IDETAPE_DEBUG_LOG
4047 if (tape->debug_level >= 3)
4048 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
4050 #endif /* IDETAPE_DEBUG_LOG */
4052 tape->restart_speed_control_req = 1;
4053 if (tape->chrdev_direction == idetape_direction_write) {
4054 idetape_empty_write_pipeline(drive);
4055 idetape_flush_tape_buffers(drive);
4057 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
4058 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
4059 if ((position = idetape_read_position(drive)) < 0)
4064 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
4066 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
4068 memset(&mtget, 0, sizeof (struct mtget));
4069 mtget.mt_type = MT_ISSCSI2;
4070 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
4071 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
4072 if (tape->drv_write_prot) {
4073 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
4075 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
4079 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
4080 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
4084 if (tape->chrdev_direction == idetape_direction_read)
4085 idetape_discard_read_pipeline(drive, 1);
4086 return idetape_blkdev_ioctl(drive, cmd, arg);
4090 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
4093 * Our character device open function.
4095 static int idetape_chrdev_open (struct inode *inode, struct file *filp)
4097 unsigned int minor = iminor(inode), i = minor & ~0xc0;
4099 idetape_tape_t *tape;
4103 nonseekable_open(inode, filp);
4104 #if IDETAPE_DEBUG_LOG
4105 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
4106 #endif /* IDETAPE_DEBUG_LOG */
4108 if (i >= MAX_HWIFS * MAX_DRIVES)
4110 drive = idetape_chrdevs[i].drive;
4111 tape = drive->driver_data;
4112 filp->private_data = drive;
4114 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags))
4116 retval = idetape_wait_ready(drive, 60 * HZ);
4118 clear_bit(IDETAPE_BUSY, &tape->flags);
4119 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
4123 idetape_read_position(drive);
4124 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
4125 (void)idetape_rewind_tape(drive);
4127 if (tape->chrdev_direction != idetape_direction_read)
4128 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
4130 /* Read block size and write protect status from drive. */
4131 idetape_get_blocksize_from_block_descriptor(drive);
4133 /* Set write protect flag if device is opened as read-only. */
4134 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
4135 tape->write_prot = 1;
4137 tape->write_prot = tape->drv_write_prot;
4139 /* Make sure drive isn't write protected if user wants to write. */
4140 if (tape->write_prot) {
4141 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
4142 (filp->f_flags & O_ACCMODE) == O_RDWR) {
4143 clear_bit(IDETAPE_BUSY, &tape->flags);
4149 * Lock the tape drive door so user can't eject.
4151 if (tape->chrdev_direction == idetape_direction_none) {
4152 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
4153 if (!idetape_queue_pc_tail(drive, &pc)) {
4154 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
4155 tape->door_locked = DOOR_LOCKED;
4159 idetape_restart_speed_control(drive);
4160 tape->restart_speed_control_req = 0;
4164 static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
4166 idetape_tape_t *tape = drive->driver_data;
4168 idetape_empty_write_pipeline(drive);
4169 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
4170 if (tape->merge_stage != NULL) {
4171 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
4172 __idetape_kfree_stage(tape->merge_stage);
4173 tape->merge_stage = NULL;
4175 idetape_write_filemark(drive);
4176 idetape_flush_tape_buffers(drive);
4177 idetape_flush_tape_buffers(drive);
4181 * Our character device release function.
4183 static int idetape_chrdev_release (struct inode *inode, struct file *filp)
4185 ide_drive_t *drive = filp->private_data;
4186 idetape_tape_t *tape;
4188 unsigned int minor = iminor(inode);
4191 tape = drive->driver_data;
4192 #if IDETAPE_DEBUG_LOG
4193 if (tape->debug_level >= 3)
4194 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
4195 #endif /* IDETAPE_DEBUG_LOG */
4197 if (tape->chrdev_direction == idetape_direction_write)
4198 idetape_write_release(drive, minor);
4199 if (tape->chrdev_direction == idetape_direction_read) {
4201 idetape_discard_read_pipeline(drive, 1);
4203 idetape_wait_for_pipeline(drive);
4205 if (tape->cache_stage != NULL) {
4206 __idetape_kfree_stage(tape->cache_stage);
4207 tape->cache_stage = NULL;
4209 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
4210 (void) idetape_rewind_tape(drive);
4211 if (tape->chrdev_direction == idetape_direction_none) {
4212 if (tape->door_locked == DOOR_LOCKED) {
4213 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
4214 if (!idetape_queue_pc_tail(drive, &pc))
4215 tape->door_locked = DOOR_UNLOCKED;
4219 clear_bit(IDETAPE_BUSY, &tape->flags);
4225 * idetape_identify_device is called to check the contents of the
4226 * ATAPI IDENTIFY command results. We return:
4228 * 1 If the tape can be supported by us, based on the information
4231 * 0 If this tape driver is not currently supported by us.
4233 static int idetape_identify_device (ide_drive_t *drive)
4235 struct idetape_id_gcw gcw;
4236 struct hd_driveid *id = drive->id;
4237 #if IDETAPE_DEBUG_INFO
4238 unsigned short mask,i;
4239 #endif /* IDETAPE_DEBUG_INFO */
4241 if (drive->id_read == 0)
4244 *((unsigned short *) &gcw) = id->config;
4246 #if IDETAPE_DEBUG_INFO
4247 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n");
4248 printk(KERN_INFO "ide-tape: Protocol Type: ");
4249 switch (gcw.protocol) {
4250 case 0: case 1: printk("ATA\n");break;
4251 case 2: printk("ATAPI\n");break;
4252 case 3: printk("Reserved (Unknown to ide-tape)\n");break;
4254 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type);
4255 switch (gcw.device_type) {
4256 case 0: printk("Direct-access Device\n");break;
4257 case 1: printk("Streaming Tape Device\n");break;
4258 case 2: case 3: case 4: printk("Reserved\n");break;
4259 case 5: printk("CD-ROM Device\n");break;
4260 case 6: printk("Reserved\n");
4261 case 7: printk("Optical memory Device\n");break;
4262 case 0x1f: printk("Unknown or no Device type\n");break;
4263 default: printk("Reserved\n");
4265 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n");
4266 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: ");
4267 switch (gcw.drq_type) {
4268 case 0: printk("Microprocessor DRQ\n");break;
4269 case 1: printk("Interrupt DRQ\n");break;
4270 case 2: printk("Accelerated DRQ\n");break;
4271 case 3: printk("Reserved\n");break;
4273 printk(KERN_INFO "ide-tape: Command Packet Size: ");
4274 switch (gcw.packet_size) {
4275 case 0: printk("12 bytes\n");break;
4276 case 1: printk("16 bytes\n");break;
4277 default: printk("Reserved\n");break;
4279 printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model);
4280 printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev);
4281 printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no);
4282 printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512);
4283 printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
4284 printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
4285 printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
4286 printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
4287 printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
4288 printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO);
4289 printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA);
4290 printk(KERN_INFO "ide-tape: Single Word DMA supported modes: ");
4291 for (i=0,mask=1;i<8;i++,mask=mask << 1) {
4292 if (id->dma_1word & mask)
4294 if (id->dma_1word & (mask << 8))
4295 printk("(active) ");
4298 printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: ");
4299 for (i=0,mask=1;i<8;i++,mask=mask << 1) {
4300 if (id->dma_mword & mask)
4302 if (id->dma_mword & (mask << 8))
4303 printk("(active) ");
4306 if (id->field_valid & 0x0002) {
4307 printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",
4308 id->eide_pio_modes & 1 ? "Mode 3":"None");
4309 printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: ");
4310 if (id->eide_dma_min == 0)
4311 printk("Not supported\n");
4313 printk("%d ns\n",id->eide_dma_min);
4315 printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: ");
4316 if (id->eide_dma_time == 0)
4317 printk("Not supported\n");
4319 printk("%d ns\n",id->eide_dma_time);
4321 printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: ");
4322 if (id->eide_pio == 0)
4323 printk("Not supported\n");
4325 printk("%d ns\n",id->eide_pio);
4327 printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: ");
4328 if (id->eide_pio_iordy == 0)
4329 printk("Not supported\n");
4331 printk("%d ns\n",id->eide_pio_iordy);
4334 printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n");
4335 #endif /* IDETAPE_DEBUG_INFO */
4337 /* Check that we can support this device */
4339 if (gcw.protocol !=2 )
4340 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n");
4341 else if (gcw.device_type != 1)
4342 printk(KERN_ERR "ide-tape: Device type is not set to tape\n");
4343 else if (!gcw.removable)
4344 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
4345 else if (gcw.packet_size != 0) {
4346 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
4347 if (gcw.packet_size == 1)
4348 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
4355 * Use INQUIRY to get the firmware revision
4357 static void idetape_get_inquiry_results (ide_drive_t *drive)
4360 idetape_tape_t *tape = drive->driver_data;
4362 idetape_inquiry_result_t *inquiry;
4364 idetape_create_inquiry_cmd(&pc);
4365 if (idetape_queue_pc_tail(drive, &pc)) {
4366 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
4369 inquiry = (idetape_inquiry_result_t *) pc.buffer;
4370 memcpy(tape->vendor_id, inquiry->vendor_id, 8);
4371 memcpy(tape->product_id, inquiry->product_id, 16);
4372 memcpy(tape->firmware_revision, inquiry->revision_level, 4);
4373 ide_fixstring(tape->vendor_id, 10, 0);
4374 ide_fixstring(tape->product_id, 18, 0);
4375 ide_fixstring(tape->firmware_revision, 6, 0);
4376 r = tape->firmware_revision;
4377 if (*(r + 1) == '.')
4378 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
4379 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);
4383 * idetape_get_mode_sense_results asks the tape about its various
4384 * parameters. In particular, we will adjust our data transfer buffer
4385 * size to the recommended value as returned by the tape.
4387 static void idetape_get_mode_sense_results (ide_drive_t *drive)
4389 idetape_tape_t *tape = drive->driver_data;
4391 idetape_mode_parameter_header_t *header;
4392 idetape_capabilities_page_t *capabilities;
4394 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
4395 if (idetape_queue_pc_tail(drive, &pc)) {
4396 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
4397 tape->tape_block_size = 512;
4398 tape->capabilities.ctl = 52;
4399 tape->capabilities.speed = 450;
4400 tape->capabilities.buffer_size = 6 * 52;
4403 header = (idetape_mode_parameter_header_t *) pc.buffer;
4404 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
4406 capabilities->max_speed = ntohs(capabilities->max_speed);
4407 capabilities->ctl = ntohs(capabilities->ctl);
4408 capabilities->speed = ntohs(capabilities->speed);
4409 capabilities->buffer_size = ntohs(capabilities->buffer_size);
4411 if (!capabilities->speed) {
4412 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
4413 capabilities->speed = 650;
4415 if (!capabilities->max_speed) {
4416 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
4417 capabilities->max_speed = 650;
4420 tape->capabilities = *capabilities; /* Save us a copy */
4421 if (capabilities->blk512)
4422 tape->tape_block_size = 512;
4423 else if (capabilities->blk1024)
4424 tape->tape_block_size = 1024;
4426 #if IDETAPE_DEBUG_INFO
4427 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n");
4428 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n");
4429 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length);
4430 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type);
4431 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp);
4432 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl);
4434 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n");
4435 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code);
4436 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length);
4437 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No");
4438 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
4439 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
4440 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
4441 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
4442 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
4443 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
4444 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
4445 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
4446 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
4447 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
4448 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
4449 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No");
4450 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed);
4451 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl);
4452 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed);
4453 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512);
4454 #endif /* IDETAPE_DEBUG_INFO */
4458 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
4459 * and if it succeeds sets the tape block size with the reported value
4461 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive)
4464 idetape_tape_t *tape = drive->driver_data;
4466 idetape_mode_parameter_header_t *header;
4467 idetape_parameter_block_descriptor_t *block_descrp;
4469 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
4470 if (idetape_queue_pc_tail(drive, &pc)) {
4471 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
4472 if (tape->tape_block_size == 0) {
4473 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n");
4474 tape->tape_block_size = 32768;
4478 header = (idetape_mode_parameter_header_t *) pc.buffer;
4479 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t));
4480 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
4481 tape->drv_write_prot = (header->dsp & 0x80) >> 7;
4483 #if IDETAPE_DEBUG_INFO
4484 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size);
4485 #endif /* IDETAPE_DEBUG_INFO */
4487 static void idetape_add_settings (ide_drive_t *drive)
4489 idetape_tape_t *tape = drive->driver_data;
4492 * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function
4494 ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
4495 ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
4496 ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
4497 ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
4498 ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
4499 ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
4500 ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL);
4501 ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
4502 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);
4503 ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
4504 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
4505 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL);
4506 ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
4507 ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
4511 * ide_setup is called to:
4513 * 1. Initialize our various state variables.
4514 * 2. Ask the tape for its capabilities.
4515 * 3. Allocate a buffer which will be used for data
4516 * transfer. The buffer size is chosen based on
4517 * the recommendation which we received in step (2).
4519 * Note that at this point ide.c already assigned us an irq, so that
4520 * we can queue requests here and wait for their completion.
4522 static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
4524 unsigned long t1, tmid, tn, t;
4526 struct idetape_id_gcw gcw;
4530 memset(tape, 0, sizeof (idetape_tape_t));
4531 spin_lock_init(&tape->spinlock);
4532 drive->driver_data = tape;
4533 /* An ATAPI device ignores DRDY */
4534 drive->ready_stat = 0;
4535 drive->dsc_overlap = 1;
4536 #ifdef CONFIG_BLK_DEV_IDEPCI
4537 if (HWIF(drive)->pci_dev != NULL) {
4539 * These two ide-pci host adapters appear to need DSC overlap disabled.
4540 * This probably needs further analysis.
4542 if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) ||
4543 (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) {
4544 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name);
4545 drive->dsc_overlap = 0;
4548 #endif /* CONFIG_BLK_DEV_IDEPCI */
4549 /* Seagate Travan drives do not support DSC overlap. */
4550 if (strstr(drive->id->model, "Seagate STT3401"))
4551 drive->dsc_overlap = 0;
4552 tape->drive = drive;
4553 tape->minor = minor;
4554 tape->name[0] = 'h';
4555 tape->name[1] = 't';
4556 tape->name[2] = '0' + minor;
4557 tape->chrdev_direction = idetape_direction_none;
4558 tape->pc = tape->pc_stack;
4559 tape->max_insert_speed = 10000;
4560 tape->speed_control = 1;
4561 *((unsigned short *) &gcw) = drive->id->config;
4562 if (gcw.drq_type == 1)
4563 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
4565 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
4567 idetape_get_inquiry_results(drive);
4568 idetape_get_mode_sense_results(drive);
4569 idetape_get_blocksize_from_block_descriptor(drive);
4570 tape->user_bs_factor = 1;
4571 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4572 while (tape->stage_size > 0xffff) {
4573 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
4574 tape->capabilities.ctl /= 2;
4575 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4577 stage_size = tape->stage_size;
4578 tape->pages_per_stage = stage_size / PAGE_SIZE;
4579 if (stage_size % PAGE_SIZE) {
4580 tape->pages_per_stage++;
4581 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
4585 * Select the "best" DSC read/write polling frequency
4586 * and pipeline size.
4588 speed = max(tape->capabilities.speed, tape->capabilities.max_speed);
4590 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
4593 * Limit memory use for pipeline to 10% of physical memory
4596 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
4597 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
4598 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
4599 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
4600 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
4601 if (tape->max_stages == 0)
4602 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
4604 t1 = (tape->stage_size * HZ) / (speed * 1000);
4605 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
4606 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
4608 if (tape->max_stages)
4614 * Ensure that the number we got makes sense; limit
4615 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
4617 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
4618 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
4619 "%dkB pipeline, %lums tDSC%s\n",
4620 drive->name, tape->name, tape->capabilities.speed,
4621 (tape->capabilities.buffer_size * 512) / tape->stage_size,
4622 tape->stage_size / 1024,
4623 tape->max_stages * tape->stage_size / 1024,
4624 tape->best_dsc_rw_frequency * 1000 / HZ,
4625 drive->using_dma ? ", DMA":"");
4627 idetape_add_settings(drive);
4630 static int idetape_cleanup (ide_drive_t *drive)
4632 idetape_tape_t *tape = drive->driver_data;
4633 int minor = tape->minor;
4634 unsigned long flags;
4636 spin_lock_irqsave(&ide_lock, flags);
4637 if (test_bit(IDETAPE_BUSY, &tape->flags) || drive->usage ||
4638 tape->first_stage != NULL || tape->merge_stage_size) {
4639 spin_unlock_irqrestore(&ide_lock, flags);
4642 idetape_chrdevs[minor].drive = NULL;
4643 spin_unlock_irqrestore(&ide_lock, flags);
4644 DRIVER(drive)->busy = 0;
4645 (void) ide_unregister_subdriver(drive);
4646 drive->driver_data = NULL;
4647 devfs_remove("%s/mt", drive->devfs_name);
4648 devfs_remove("%s/mtn", drive->devfs_name);
4649 devfs_unregister_tape(drive->disk->number);
4651 drive->disk->fops = ide_fops;
4655 #ifdef CONFIG_PROC_FS
4657 static int proc_idetape_read_name
4658 (char *page, char **start, off_t off, int count, int *eof, void *data)
4660 ide_drive_t *drive = (ide_drive_t *) data;
4661 idetape_tape_t *tape = drive->driver_data;
4665 len = sprintf(out, "%s\n", tape->name);
4666 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
4669 static ide_proc_entry_t idetape_proc[] = {
4670 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
4671 { NULL, 0, NULL, NULL }
4676 #define idetape_proc NULL
4680 static int idetape_attach(ide_drive_t *drive);
4683 * IDE subdriver functions, registered with ide.c
4685 static ide_driver_t idetape_driver = {
4686 .owner = THIS_MODULE,
4688 .version = IDETAPE_VERSION,
4691 .supports_dsc_overlap = 1,
4692 .cleanup = idetape_cleanup,
4693 .do_request = idetape_do_request,
4694 .end_request = idetape_end_request,
4695 .pre_reset = idetape_pre_reset,
4696 .proc = idetape_proc,
4697 .attach = idetape_attach,
4698 .drives = LIST_HEAD_INIT(idetape_driver.drives),
4702 * Our character device supporting functions, passed to register_chrdev.
4704 static struct file_operations idetape_fops = {
4705 .owner = THIS_MODULE,
4706 .read = idetape_chrdev_read,
4707 .write = idetape_chrdev_write,
4708 .ioctl = idetape_chrdev_ioctl,
4709 .open = idetape_chrdev_open,
4710 .release = idetape_chrdev_release,
4713 static int idetape_open(struct inode *inode, struct file *filp)
4715 ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
4720 static int idetape_release(struct inode *inode, struct file *filp)
4722 ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
4727 static int idetape_ioctl(struct inode *inode, struct file *file,
4728 unsigned int cmd, unsigned long arg)
4730 struct block_device *bdev = inode->i_bdev;
4731 ide_drive_t *drive = bdev->bd_disk->private_data;
4732 int err = generic_ide_ioctl(file, bdev, cmd, arg);
4734 err = idetape_blkdev_ioctl(drive, cmd, arg);
4738 static struct block_device_operations idetape_block_ops = {
4739 .owner = THIS_MODULE,
4740 .open = idetape_open,
4741 .release = idetape_release,
4742 .ioctl = idetape_ioctl,
4745 static int idetape_attach (ide_drive_t *drive)
4747 idetape_tape_t *tape;
4750 if (!strstr("ide-tape", drive->driver_req))
4752 if (!drive->present)
4754 if (drive->media != ide_tape)
4756 if (!idetape_identify_device (drive)) {
4757 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
4761 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
4764 if (strstr(drive->id->model, "OnStream DI-")) {
4765 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
4766 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
4768 tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL);
4770 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
4773 if (ide_register_subdriver(drive, &idetape_driver)) {
4774 printk(KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name);
4778 for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++)
4780 idetape_setup(drive, tape, minor);
4781 idetape_chrdevs[minor].drive = drive;
4783 devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor),
4784 S_IFCHR | S_IRUGO | S_IWUGO,
4785 "%s/mt", drive->devfs_name);
4786 devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor + 128),
4787 S_IFCHR | S_IRUGO | S_IWUGO,
4788 "%s/mtn", drive->devfs_name);
4790 drive->disk->number = devfs_register_tape(drive->devfs_name);
4791 drive->disk->fops = &idetape_block_ops;
4797 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4798 MODULE_LICENSE("GPL");
4800 static void __exit idetape_exit (void)
4802 ide_unregister_driver(&idetape_driver);
4803 unregister_chrdev(IDETAPE_MAJOR, "ht");
4807 * idetape_init will register the driver for each tape.
4809 static int idetape_init (void)
4811 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
4812 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
4815 ide_register_driver(&idetape_driver);
4819 module_init(idetape_init);
4820 module_exit(idetape_exit);
4821 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);