2 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
3 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
7 * This driver was constructed as a student project in the software laboratory
8 * of the faculty of electrical engineering in the Technion - Israel's
9 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
16 * IDE ATAPI streaming tape driver.
18 * This driver is a part of the Linux ide driver and works in co-operation
19 * with linux/drivers/block/ide.c.
21 * The driver, in co-operation with ide.c, basically traverses the
22 * request-list for the block device interface. The character device
23 * interface, on the other hand, creates new requests, adds them
24 * to the request-list of the block device, and waits for their completion.
26 * Pipelined operation mode is now supported on both reads and writes.
28 * The block device major and minor numbers are determined from the
29 * tape's relative position in the ide interfaces, as explained in ide.c.
31 * The character device interface consists of the following devices:
33 * ht0 major 37, minor 0 first IDE tape, rewind on close.
34 * ht1 major 37, minor 1 second IDE tape, rewind on close.
36 * nht0 major 37, minor 128 first IDE tape, no rewind on close.
37 * nht1 major 37, minor 129 second IDE tape, no rewind on close.
40 * Run linux/scripts/MAKEDEV.ide to create the above entries.
42 * The general magnetic tape commands compatible interface, as defined by
43 * include/linux/mtio.h, is accessible through the character device.
45 * General ide driver configuration options, such as the interrupt-unmask
46 * flag, can be configured by issuing an ioctl to the block device interface,
47 * as any other ide device.
49 * Our own ide-tape ioctl's can be issued to either the block device or
50 * the character device interface.
52 * Maximal throughput with minimal bus load will usually be achieved in the
55 * 1. ide-tape is operating in the pipelined operation mode.
56 * 2. No buffering is performed by the user backup program.
58 * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive.
60 * Ver 0.1 Nov 1 95 Pre-working code :-)
61 * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure
62 * was successful ! (Using tar cvf ... on the block
64 * A longer backup resulted in major swapping, bad
65 * overall Linux performance and eventually failed as
66 * we received non serial read-ahead requests from the
68 * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the
69 * character device interface. Linux's responsiveness
70 * and performance doesn't seem to be much affected
71 * from the background backup procedure.
72 * Some general mtio.h magnetic tape operations are
73 * now supported by our character device. As a result,
74 * popular tape utilities are starting to work with
76 * The following configurations were tested:
77 * 1. An IDE ATAPI TAPE shares the same interface
78 * and irq with an IDE ATAPI CDROM.
79 * 2. An IDE ATAPI TAPE shares the same interface
80 * and irq with a normal IDE disk.
81 * Both configurations seemed to work just fine !
82 * However, to be on the safe side, it is meanwhile
83 * recommended to give the IDE TAPE its own interface
85 * The one thing which needs to be done here is to
86 * add a "request postpone" feature to ide.c,
87 * so that we won't have to wait for the tape to finish
88 * performing a long media access (DSC) request (such
89 * as a rewind) before we can access the other device
90 * on the same interface. This effect doesn't disturb
91 * normal operation most of the time because read/write
92 * requests are relatively fast, and once we are
93 * performing one tape r/w request, a lot of requests
94 * from the other device can be queued and ide.c will
95 * service all of them after this single tape request.
96 * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree.
97 * On each read / write request, we now ask the drive
98 * if we can transfer a constant number of bytes
99 * (a parameter of the drive) only to its buffers,
100 * without causing actual media access. If we can't,
101 * we just wait until we can by polling the DSC bit.
102 * This ensures that while we are not transferring
103 * more bytes than the constant referred to above, the
104 * interrupt latency will not become too high and
105 * we won't cause an interrupt timeout, as happened
106 * occasionally in the previous version.
107 * While polling for DSC, the current request is
108 * postponed and ide.c is free to handle requests from
109 * the other device. This is handled transparently to
110 * ide.c. The hwgroup locking method which was used
111 * in the previous version was removed.
112 * Use of new general features which are provided by
113 * ide.c for use with atapi devices.
114 * (Programming done by Mark Lord)
115 * Few potential bug fixes (Again, suggested by Mark)
116 * Single character device data transfers are now
117 * not limited in size, as they were before.
118 * We are asking the tape about its recommended
119 * transfer unit and send a larger data transfer
120 * as several transfers of the above size.
121 * For best results, use an integral number of this
122 * basic unit (which is shown during driver
123 * initialization). I will soon add an ioctl to get
124 * this important parameter.
125 * Our data transfer buffer is allocated on startup,
126 * rather than before each data transfer. This should
127 * ensure that we will indeed have a data buffer.
128 * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape
129 * shared an interface with another device.
130 * (poll_for_dsc was a complete mess).
131 * Removed some old (non-active) code which had
132 * to do with supporting buffer cache originated
134 * The block device interface can now be opened, so
135 * that general ide driver features like the unmask
136 * interrupts flag can be selected with an ioctl.
137 * This is the only use of the block device interface.
138 * New fast pipelined operation mode (currently only on
139 * writes). When using the pipelined mode, the
140 * throughput can potentially reach the maximum
141 * tape supported throughput, regardless of the
142 * user backup program. On my tape drive, it sometimes
143 * boosted performance by a factor of 2. Pipelined
144 * mode is enabled by default, but since it has a few
145 * downfalls as well, you may want to disable it.
146 * A short explanation of the pipelined operation mode
147 * is available below.
148 * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition.
149 * Added pipeline read mode. As a result, restores
150 * are now as fast as backups.
151 * Optimized shared interface behavior. The new behavior
152 * typically results in better IDE bus efficiency and
153 * higher tape throughput.
154 * Pre-calculation of the expected read/write request
155 * service time, based on the tape's parameters. In
156 * the pipelined operation mode, this allows us to
157 * adjust our polling frequency to a much lower value,
158 * and thus to dramatically reduce our load on Linux,
159 * without any decrease in performance.
160 * Implemented additional mtio.h operations.
161 * The recommended user block size is returned by
162 * the MTIOCGET ioctl.
163 * Additional minor changes.
164 * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the
165 * use of some block sizes during a restore procedure.
166 * The character device interface will now present a
167 * continuous view of the media - any mix of block sizes
168 * during a backup/restore procedure is supported. The
169 * driver will buffer the requests internally and
170 * convert them to the tape's recommended transfer
171 * unit, making performance almost independent of the
172 * chosen user block size.
173 * Some improvements in error recovery.
174 * By cooperating with ide-dma.c, bus mastering DMA can
175 * now sometimes be used with IDE tape drives as well.
176 * Bus mastering DMA has the potential to dramatically
177 * reduce the CPU's overhead when accessing the device,
178 * and can be enabled by using hdparm -d1 on the tape's
179 * block device interface. For more info, read the
180 * comments in ide-dma.c.
181 * Ver 1.4 Mar 13 96 Fixed serialize support.
182 * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85.
183 * Fixed pipelined read mode inefficiency.
184 * Fixed nasty null dereferencing bug.
185 * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver.
186 * Fixed end of media bug.
187 * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model.
188 * Ver 1.8 Sep 26 96 Attempt to find a better balance between good
189 * interactive response and high system throughput.
190 * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather
191 * than requiring an explicit FSF command.
192 * Abort pending requests at end of media.
193 * MTTELL was sometimes returning incorrect results.
194 * Return the real block size in the MTIOCGET ioctl.
195 * Some error recovery bug fixes.
196 * Ver 1.10 Nov 5 96 Major reorganization.
197 * Reduced CPU overhead a bit by eliminating internal
199 * Added module support.
200 * Added multiple tape drives support.
201 * Added partition support.
202 * Rewrote DSC handling.
203 * Some portability fixes.
204 * Removed ide-tape.h.
205 * Additional minor changes.
206 * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling.
207 * Use ide_stall_queue() for DSC overlap.
208 * Use the maximum speed rather than the current speed
209 * to compute the request service time.
210 * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data
211 * corruption, which could occur if the total number
212 * of bytes written to the tape was not an integral
213 * number of tape blocks.
214 * Add support for INTERRUPT DRQ devices.
215 * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB
216 * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives.
217 * Replace cli()/sti() with hwgroup spinlocks.
218 * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup
219 * spinlock with private per-tape spinlock.
220 * Ver 1.16 Sep 1 99 Add OnStream tape support.
221 * Abort read pipeline on EOD.
222 * Wait for the tape to become ready in case it returns
223 * "in the process of becoming ready" on open().
224 * Fix zero padding of the last written block in
225 * case the tape block size is larger than PAGE_SIZE.
226 * Decrease the default disconnection time to tn.
227 * Ver 1.16e Oct 3 99 Minor fixes.
228 * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen,
229 * niessen@iae.nl / arnold.niessen@philips.com
230 * GO-1) Undefined code in idetape_read_position
231 * according to Gadi's email
232 * AJN-1) Minor fix asc == 11 should be asc == 0x11
233 * in idetape_issue_packet_command (did effect
234 * debugging output only)
235 * AJN-2) Added more debugging output, and
236 * added ide-tape: where missing. I would also
237 * like to add tape->name where possible
238 * AJN-3) Added different debug_level's
239 * via /proc/ide/hdc/settings
240 * "debug_level" determines amount of debugging output;
241 * can be changed using /proc/ide/hdx/settings
242 * 0 : almost no debugging output
243 * 1 : 0+output errors only
244 * 2 : 1+output all sensekey/asc
245 * 3 : 2+follow all chrdev related procedures
246 * 4 : 3+follow all procedures
247 * 5 : 4+include pc_stack rq_stack info
248 * 6 : 5+USE_COUNT updates
249 * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail
250 * from 5 to 10 minutes
251 * AJN-5) Changed maximum number of blocks to skip when
252 * reading tapes with multiple consecutive write
253 * errors from 100 to 1000 in idetape_get_logical_blk
254 * Proposed changes to code:
255 * 1) output "logical_blk_num" via /proc
256 * 2) output "current_operation" via /proc
257 * 3) Either solve or document the fact that `mt rewind' is
258 * required after reading from /dev/nhtx to be
259 * able to rmmod the idetape module;
260 * Also, sometimes an application finishes but the
261 * device remains `busy' for some time. Same cause ?
262 * Proposed changes to release-notes:
263 * 4) write a simple `quickstart' section in the
264 * release notes; I volunteer if you don't want to
265 * 5) include a pointer to video4linux in the doc
266 * to stimulate video applications
267 * 6) release notes lines 331 and 362: explain what happens
268 * if the application data rate is higher than 1100 KB/s;
269 * similar approach to lower-than-500 kB/s ?
270 * 7) 6.6 Comparison; wouldn't it be better to allow different
271 * strategies for read and write ?
272 * Wouldn't it be better to control the tape buffer
273 * contents instead of the bandwidth ?
274 * 8) line 536: replace will by would (if I understand
275 * this section correctly, a hypothetical and unwanted situation
276 * is being described)
277 * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames.
278 * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl
279 * - Add idetape_onstream_mode_sense_tape_parameter_page
280 * function to get tape capacity in frames: tape->capacity.
281 * - Add support for DI-50 drives( or any DI- drive).
282 * - 'workaround' for read error/blank block around block 3000.
283 * - Implement Early warning for end of media for Onstream.
284 * - Cosmetic code changes for readability.
285 * - Idetape_position_tape should not use SKIP bit during
286 * Onstream read recovery.
287 * - Add capacity, logical_blk_num and first/last_frame_position
288 * to /proc/ide/hd?/settings.
289 * - Module use count was gone in the Linux 2.4 driver.
290 * Ver 1.17a Apr 2001 Willem Riede osst@riede.org
291 * - Get drive's actual block size from mode sense block descriptor
292 * - Limit size of pipeline
293 * Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu>
294 * Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used
296 * Actually removed aborted stages in idetape_abort_pipeline
297 * instead of just changing the command code.
298 * Made the transfer byte count for Request Sense equal to the
299 * actual length of the data transfer.
300 * Changed handling of partial data transfers: they do not
302 * Moved initiation of DMA transfers to the correct place.
303 * Removed reference to unallocated memory.
304 * Made __idetape_discard_read_pipeline return the number of
305 * sectors skipped, not the number of stages.
306 * Replaced errant kfree() calls with __idetape_kfree_stage().
307 * Fixed off-by-one error in testing the pipeline length.
308 * Fixed handling of filemarks in the read pipeline.
309 * Small code optimization for MTBSF and MTBSFM ioctls.
310 * Don't try to unlock the door during device close if is
312 * Cosmetic fixes to miscellaneous debugging output messages.
313 * Set the minimum /proc/ide/hd?/settings values for "pipeline",
314 * "pipeline_min", and "pipeline_max" to 1.
316 * Here are some words from the first releases of hd.c, which are quoted
317 * in ide.c and apply here as well:
319 * | Special care is recommended. Have Fun!
324 * An overview of the pipelined operation mode.
326 * In the pipelined write mode, we will usually just add requests to our
327 * pipeline and return immediately, before we even start to service them. The
328 * user program will then have enough time to prepare the next request while
329 * we are still busy servicing previous requests. In the pipelined read mode,
330 * the situation is similar - we add read-ahead requests into the pipeline,
331 * before the user even requested them.
333 * The pipeline can be viewed as a "safety net" which will be activated when
334 * the system load is high and prevents the user backup program from keeping up
335 * with the current tape speed. At this point, the pipeline will get
336 * shorter and shorter but the tape will still be streaming at the same speed.
337 * Assuming we have enough pipeline stages, the system load will hopefully
338 * decrease before the pipeline is completely empty, and the backup program
339 * will be able to "catch up" and refill the pipeline again.
341 * When using the pipelined mode, it would be best to disable any type of
342 * buffering done by the user program, as ide-tape already provides all the
343 * benefits in the kernel, where it can be done in a more efficient way.
344 * As we will usually not block the user program on a request, the most
345 * efficient user code will then be a simple read-write-read-... cycle.
346 * Any additional logic will usually just slow down the backup process.
348 * Using the pipelined mode, I get a constant over 400 KBps throughput,
349 * which seems to be the maximum throughput supported by my tape.
351 * However, there are some downfalls:
353 * 1. We use memory (for data buffers) in proportional to the number
354 * of pipeline stages (each stage is about 26 KB with my tape).
355 * 2. In the pipelined write mode, we cheat and postpone error codes
356 * to the user task. In read mode, the actual tape position
357 * will be a bit further than the last requested block.
361 * 1. We allocate stages dynamically only when we need them. When
362 * we don't need them, we don't consume additional memory. In
363 * case we can't allocate stages, we just manage without them
364 * (at the expense of decreased throughput) so when Linux is
365 * tight in memory, we will not pose additional difficulties.
367 * 2. The maximum number of stages (which is, in fact, the maximum
368 * amount of memory) which we allocate is limited by the compile
369 * time parameter IDETAPE_MAX_PIPELINE_STAGES.
371 * 3. The maximum number of stages is a controlled parameter - We
372 * don't start from the user defined maximum number of stages
373 * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we
374 * will not even allocate this amount of stages if the user
375 * program can't handle the speed). We then implement a feedback
376 * loop which checks if the pipeline is empty, and if it is, we
377 * increase the maximum number of stages as necessary until we
378 * reach the optimum value which just manages to keep the tape
379 * busy with minimum allocated memory or until we reach
380 * IDETAPE_MAX_PIPELINE_STAGES.
384 * In pipelined write mode, ide-tape can not return accurate error codes
385 * to the user program since we usually just add the request to the
386 * pipeline without waiting for it to be serviced. In case an error
387 * occurs, I will report it on the next user request.
389 * In the pipelined read mode, subsequent read requests or forward
390 * filemark spacing will perform correctly, as we preserve all blocks
391 * and filemarks which we encountered during our excess read-ahead.
393 * For accurate tape positioning and error reporting, disabling
394 * pipelined mode might be the best option.
396 * You can enable/disable/tune the pipelined operation mode by adjusting
397 * the compile time parameters below.
401 * Possible improvements.
403 * 1. Support for the ATAPI overlap protocol.
405 * In order to maximize bus throughput, we currently use the DSC
406 * overlap method which enables ide.c to service requests from the
407 * other device while the tape is busy executing a command. The
408 * DSC overlap method involves polling the tape's status register
409 * for the DSC bit, and servicing the other device while the tape
412 * In the current QIC development standard (December 1995),
413 * it is recommended that new tape drives will *in addition*
414 * implement the ATAPI overlap protocol, which is used for the
415 * same purpose - efficient use of the IDE bus, but is interrupt
416 * driven and thus has much less CPU overhead.
418 * ATAPI overlap is likely to be supported in most new ATAPI
419 * devices, including new ATAPI cdroms, and thus provides us
420 * a method by which we can achieve higher throughput when
421 * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device.
424 #define IDETAPE_VERSION "1.19"
426 #include <linux/module.h>
427 #include <linux/types.h>
428 #include <linux/string.h>
429 #include <linux/kernel.h>
430 #include <linux/delay.h>
431 #include <linux/timer.h>
432 #include <linux/mm.h>
433 #include <linux/interrupt.h>
434 #include <linux/jiffies.h>
435 #include <linux/major.h>
436 #include <linux/errno.h>
437 #include <linux/genhd.h>
438 #include <linux/slab.h>
439 #include <linux/pci.h>
440 #include <linux/ide.h>
441 #include <linux/smp_lock.h>
442 #include <linux/completion.h>
443 #include <linux/bitops.h>
444 #include <linux/mutex.h>
446 #include <asm/byteorder.h>
448 #include <asm/uaccess.h>
450 #include <asm/unaligned.h>
455 typedef struct os_partition_s {
459 __u32 first_frame_addr;
460 __u32 last_frame_addr;
461 __u32 eod_frame_addr;
467 typedef struct os_dat_entry_s {
477 #define OS_DAT_FLAGS_DATA (0xc)
478 #define OS_DAT_FLAGS_MARK (0x1)
480 typedef struct os_dat_s {
485 os_dat_entry_t dat_list[16];
488 #include <linux/mtio.h>
490 /**************************** Tunable parameters *****************************/
494 * Pipelined mode parameters.
496 * We try to use the minimum number of stages which is enough to
497 * keep the tape constantly streaming. To accomplish that, we implement
498 * a feedback loop around the maximum number of stages:
500 * We start from MIN maximum stages (we will not even use MIN stages
501 * if we don't need them), increment it by RATE*(MAX-MIN)
502 * whenever we sense that the pipeline is empty, until we reach
503 * the optimum value or until we reach MAX.
505 * Setting the following parameter to 0 is illegal: the pipelined mode
506 * cannot be disabled (calculate_speeds() divides by tape->max_stages.)
508 #define IDETAPE_MIN_PIPELINE_STAGES 1
509 #define IDETAPE_MAX_PIPELINE_STAGES 400
510 #define IDETAPE_INCREASE_STAGES_RATE 20
513 * The following are used to debug the driver:
515 * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities.
516 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
517 * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in
520 * Setting them to 0 will restore normal operation mode:
522 * 1. Disable logging normal successful operations.
523 * 2. Disable self-sanity checks.
524 * 3. Errors will still be logged, of course.
526 * All the #if DEBUG code will be removed some day, when the driver
527 * is verified to be stable enough. This will make it much more
530 #define IDETAPE_DEBUG_INFO 0
531 #define IDETAPE_DEBUG_LOG 0
532 #define IDETAPE_DEBUG_BUGS 1
535 * After each failed packet command we issue a request sense command
536 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
538 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
540 #define IDETAPE_MAX_PC_RETRIES 3
543 * With each packet command, we allocate a buffer of
544 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
545 * commands (Not for READ/WRITE commands).
547 #define IDETAPE_PC_BUFFER_SIZE 256
550 * In various places in the driver, we need to allocate storage
551 * for packet commands and requests, which will remain valid while
552 * we leave the driver to wait for an interrupt or a timeout event.
554 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
557 * Some drives (for example, Seagate STT3401A Travan) require a very long
558 * timeout, because they don't return an interrupt or clear their busy bit
559 * until after the command completes (even retension commands).
561 #define IDETAPE_WAIT_CMD (900*HZ)
564 * The following parameter is used to select the point in the internal
565 * tape fifo in which we will start to refill the buffer. Decreasing
566 * the following parameter will improve the system's latency and
567 * interactive response, while using a high value might improve system
570 #define IDETAPE_FIFO_THRESHOLD 2
573 * DSC polling parameters.
575 * Polling for DSC (a single bit in the status register) is a very
576 * important function in ide-tape. There are two cases in which we
579 * 1. Before a read/write packet command, to ensure that we
580 * can transfer data from/to the tape's data buffers, without
581 * causing an actual media access. In case the tape is not
582 * ready yet, we take out our request from the device
583 * request queue, so that ide.c will service requests from
584 * the other device on the same interface meanwhile.
586 * 2. After the successful initialization of a "media access
587 * packet command", which is a command which can take a long
588 * time to complete (it can be several seconds or even an hour).
590 * Again, we postpone our request in the middle to free the bus
591 * for the other device. The polling frequency here should be
592 * lower than the read/write frequency since those media access
593 * commands are slow. We start from a "fast" frequency -
594 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
595 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
596 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
598 * We also set a timeout for the timer, in case something goes wrong.
599 * The timeout should be longer then the maximum execution time of a
606 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
607 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
608 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
609 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
610 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
611 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
612 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
614 /*************************** End of tunable parameters ***********************/
617 * Read/Write error simulation
619 #define SIMULATE_ERRORS 0
622 * For general magnetic tape device compatibility.
625 idetape_direction_none,
626 idetape_direction_read,
627 idetape_direction_write
628 } idetape_chrdev_direction_t;
633 struct idetape_bh *b_reqnext;
638 * Our view of a packet command.
640 typedef struct idetape_packet_command_s {
641 u8 c[12]; /* Actual packet bytes */
642 int retries; /* On each retry, we increment retries */
643 int error; /* Error code */
644 int request_transfer; /* Bytes to transfer */
645 int actually_transferred; /* Bytes actually transferred */
646 int buffer_size; /* Size of our data buffer */
647 struct idetape_bh *bh;
650 u8 *buffer; /* Data buffer */
651 u8 *current_position; /* Pointer into the above buffer */
652 ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
653 u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
654 unsigned long flags; /* Status/Action bit flags: long for set_bit */
658 * Packet command flag bits.
660 /* Set when an error is considered normal - We won't retry */
662 /* 1 When polling for DSC on a media access command */
663 #define PC_WAIT_FOR_DSC 1
664 /* 1 when we prefer to use DMA if possible */
665 #define PC_DMA_RECOMMENDED 2
666 /* 1 while DMA in progress */
667 #define PC_DMA_IN_PROGRESS 3
668 /* 1 when encountered problem during DMA */
669 #define PC_DMA_ERROR 4
674 * Capabilities and Mechanical Status Page
677 unsigned page_code :6; /* Page code - Should be 0x2a */
679 __u8 ps :1; /* parameters saveable */
680 __u8 page_length; /* Page Length - Should be 0x12 */
681 __u8 reserved2, reserved3;
682 unsigned ro :1; /* Read Only Mode */
683 unsigned reserved4_1234 :4;
684 unsigned sprev :1; /* Supports SPACE in the reverse direction */
685 unsigned reserved4_67 :2;
686 unsigned reserved5_012 :3;
687 unsigned efmt :1; /* Supports ERASE command initiated formatting */
688 unsigned reserved5_4 :1;
689 unsigned qfa :1; /* Supports the QFA two partition formats */
690 unsigned reserved5_67 :2;
691 unsigned lock :1; /* Supports locking the volume */
692 unsigned locked :1; /* The volume is locked */
693 unsigned prevent :1; /* The device defaults in the prevent state after power up */
694 unsigned eject :1; /* The device can eject the volume */
695 __u8 disconnect :1; /* The device can break request > ctl */
697 unsigned ecc :1; /* Supports error correction */
698 unsigned cmprs :1; /* Supports data compression */
699 unsigned reserved7_0 :1;
700 unsigned blk512 :1; /* Supports 512 bytes block size */
701 unsigned blk1024 :1; /* Supports 1024 bytes block size */
702 unsigned reserved7_3_6 :4;
703 unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
704 /* transfers for slow buffer memory ??? */
705 /* Also 32768 block size in some cases */
706 __u16 max_speed; /* Maximum speed supported in KBps */
707 __u8 reserved10, reserved11;
708 __u16 ctl; /* Continuous Transfer Limit in blocks */
709 __u16 speed; /* Current Speed, in KBps */
710 __u16 buffer_size; /* Buffer Size, in 512 bytes */
711 __u8 reserved18, reserved19;
712 } idetape_capabilities_page_t;
718 unsigned page_code :6; /* Page code - Should be 0x30 */
719 unsigned reserved1_6 :1;
721 __u8 page_length; /* Page Length - Should be 2 */
724 unsigned play32_5 :1;
725 unsigned reserved2_23 :2;
726 unsigned record32 :1;
727 unsigned record32_5 :1;
728 unsigned reserved2_6 :1;
730 } idetape_block_size_page_t;
735 typedef struct idetape_stage_s {
736 struct request rq; /* The corresponding request */
737 struct idetape_bh *bh; /* The data buffers */
738 struct idetape_stage_s *next; /* Pointer to the next stage */
742 * REQUEST SENSE packet command result - Data Format.
745 unsigned error_code :7; /* Current of deferred errors */
746 unsigned valid :1; /* The information field conforms to QIC-157C */
747 __u8 reserved1 :8; /* Segment Number - Reserved */
748 unsigned sense_key :4; /* Sense Key */
749 unsigned reserved2_4 :1; /* Reserved */
750 unsigned ili :1; /* Incorrect Length Indicator */
751 unsigned eom :1; /* End Of Medium */
752 unsigned filemark :1; /* Filemark */
753 __u32 information __attribute__ ((packed));
754 __u8 asl; /* Additional sense length (n-7) */
755 __u32 command_specific; /* Additional command specific information */
756 __u8 asc; /* Additional Sense Code */
757 __u8 ascq; /* Additional Sense Code Qualifier */
758 __u8 replaceable_unit_code; /* Field Replaceable Unit Code */
759 unsigned sk_specific1 :7; /* Sense Key Specific */
760 unsigned sksv :1; /* Sense Key Specific information is valid */
761 __u8 sk_specific2; /* Sense Key Specific */
762 __u8 sk_specific3; /* Sense Key Specific */
763 __u8 pad[2]; /* Padding to 20 bytes */
764 } idetape_request_sense_result_t;
768 * Most of our global data which we need to save even as we leave the
769 * driver due to an interrupt or a timer event is stored in a variable
770 * of type idetape_tape_t, defined below.
772 typedef struct ide_tape_obj {
774 ide_driver_t *driver;
775 struct gendisk *disk;
779 * Since a typical character device operation requires more
780 * than one packet command, we provide here enough memory
781 * for the maximum of interconnected packet commands.
782 * The packet commands are stored in the circular array pc_stack.
783 * pc_stack_index points to the last used entry, and warps around
784 * to the start when we get to the last array entry.
786 * pc points to the current processed packet command.
788 * failed_pc points to the last failed packet command, or contains
789 * NULL if we do not need to retry any packet command. This is
790 * required since an additional packet command is needed before the
791 * retry, to get detailed information on what went wrong.
793 /* Current packet command */
795 /* Last failed packet command */
796 idetape_pc_t *failed_pc;
797 /* Packet command stack */
798 idetape_pc_t pc_stack[IDETAPE_PC_STACK];
799 /* Next free packet command storage space */
801 struct request rq_stack[IDETAPE_PC_STACK];
802 /* We implement a circular array */
806 * DSC polling variables.
808 * While polling for DSC we use postponed_rq to postpone the
809 * current request so that ide.c will be able to service
810 * pending requests on the other device. Note that at most
811 * we will have only one DSC (usually data transfer) request
812 * in the device request queue. Additional requests can be
813 * queued in our internal pipeline, but they will be visible
814 * to ide.c only one at a time.
816 struct request *postponed_rq;
817 /* The time in which we started polling for DSC */
818 unsigned long dsc_polling_start;
819 /* Timer used to poll for dsc */
820 struct timer_list dsc_timer;
821 /* Read/Write dsc polling frequency */
822 unsigned long best_dsc_rw_frequency;
823 /* The current polling frequency */
824 unsigned long dsc_polling_frequency;
825 /* Maximum waiting time */
826 unsigned long dsc_timeout;
829 * Read position information
833 unsigned int first_frame_position;
834 unsigned int last_frame_position;
835 unsigned int blocks_in_buffer;
838 * Last error information
840 u8 sense_key, asc, ascq;
843 * Character device operation
848 /* Current character device data transfer direction */
849 idetape_chrdev_direction_t chrdev_direction;
854 /* Usually 512 or 1024 bytes */
855 unsigned short tape_block_size;
857 /* Copy of the tape's Capabilities and Mechanical Page */
858 idetape_capabilities_page_t capabilities;
861 * Active data transfer request parameters.
863 * At most, there is only one ide-tape originated data transfer
864 * request in the device request queue. This allows ide.c to
865 * easily service requests from the other device when we
866 * postpone our active request. In the pipelined operation
867 * mode, we use our internal pipeline structure to hold
868 * more data requests.
870 * The data buffer size is chosen based on the tape's
873 /* Pointer to the request which is waiting in the device request queue */
874 struct request *active_data_request;
875 /* Data buffer size (chosen based on the tape's recommendation */
877 idetape_stage_t *merge_stage;
878 int merge_stage_size;
879 struct idetape_bh *bh;
884 * Pipeline parameters.
886 * To accomplish non-pipelined mode, we simply set the following
887 * variables to zero (or NULL, where appropriate).
889 /* Number of currently used stages */
891 /* Number of pending stages */
892 int nr_pending_stages;
893 /* We will not allocate more than this number of stages */
894 int max_stages, min_pipeline, max_pipeline;
895 /* The first stage which will be removed from the pipeline */
896 idetape_stage_t *first_stage;
897 /* The currently active stage */
898 idetape_stage_t *active_stage;
899 /* Will be serviced after the currently active request */
900 idetape_stage_t *next_stage;
901 /* New requests will be added to the pipeline here */
902 idetape_stage_t *last_stage;
903 /* Optional free stage which we can use */
904 idetape_stage_t *cache_stage;
906 /* Wasted space in each stage */
909 /* Status/Action flags: long for set_bit */
911 /* protects the ide-tape queue */
915 * Measures average tape speed
917 unsigned long avg_time;
921 /* last sense information */
922 idetape_request_sense_result_t sense;
926 char firmware_revision[6];
927 int firmware_revision_num;
929 /* the door is currently locked */
931 /* the tape hardware is write protected */
933 /* the tape is write protected (hardware or opened as read-only) */
937 * Limit the number of times a request can
938 * be postponed, to avoid an infinite postpone
941 /* request postpone count limit */
945 * Measures number of frames:
947 * 1. written/read to/from the driver pipeline (pipeline_head).
948 * 2. written/read to/from the tape buffers (idetape_bh).
949 * 3. written/read by the tape to/from the media (tape_head).
957 * Speed control at the tape buffers input/output
959 unsigned long insert_time;
962 int max_insert_speed;
963 int measure_insert_time;
966 * Measure tape still time, in milliseconds
968 unsigned long tape_still_time_begin;
972 * Speed regulation negative feedback loop
975 int pipeline_head_speed;
976 int controlled_pipeline_head_speed;
977 int uncontrolled_pipeline_head_speed;
978 int controlled_last_pipeline_head;
979 int uncontrolled_last_pipeline_head;
980 unsigned long uncontrolled_pipeline_head_time;
981 unsigned long controlled_pipeline_head_time;
982 int controlled_previous_pipeline_head;
983 int uncontrolled_previous_pipeline_head;
984 unsigned long controlled_previous_head_time;
985 unsigned long uncontrolled_previous_head_time;
986 int restart_speed_control_req;
989 * Debug_level determines amount of debugging output;
990 * can be changed using /proc/ide/hdx/settings
991 * 0 : almost no debugging output
992 * 1 : 0+output errors only
993 * 2 : 1+output all sensekey/asc
994 * 3 : 2+follow all chrdev related procedures
995 * 4 : 3+follow all procedures
996 * 5 : 4+include pc_stack rq_stack info
997 * 6 : 5+USE_COUNT updates
1002 static DEFINE_MUTEX(idetape_ref_mutex);
1004 static struct class *idetape_sysfs_class;
1006 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
1008 #define ide_tape_g(disk) \
1009 container_of((disk)->private_data, struct ide_tape_obj, driver)
1011 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
1013 struct ide_tape_obj *tape = NULL;
1015 mutex_lock(&idetape_ref_mutex);
1016 tape = ide_tape_g(disk);
1018 kref_get(&tape->kref);
1019 mutex_unlock(&idetape_ref_mutex);
1023 static void ide_tape_release(struct kref *);
1025 static void ide_tape_put(struct ide_tape_obj *tape)
1027 mutex_lock(&idetape_ref_mutex);
1028 kref_put(&tape->kref, ide_tape_release);
1029 mutex_unlock(&idetape_ref_mutex);
1035 #define DOOR_UNLOCKED 0
1036 #define DOOR_LOCKED 1
1037 #define DOOR_EXPLICITLY_LOCKED 2
1040 * Tape flag bits values.
1042 #define IDETAPE_IGNORE_DSC 0
1043 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
1044 #define IDETAPE_BUSY 2 /* Device already opened */
1045 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
1046 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
1047 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
1048 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
1049 #define IDETAPE_READ_ERROR 7
1050 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
1051 /* 0 = no tape is loaded, so we don't rewind after ejecting */
1052 #define IDETAPE_MEDIUM_PRESENT 9
1055 * Supported ATAPI tape drives packet commands
1057 #define IDETAPE_TEST_UNIT_READY_CMD 0x00
1058 #define IDETAPE_REWIND_CMD 0x01
1059 #define IDETAPE_REQUEST_SENSE_CMD 0x03
1060 #define IDETAPE_READ_CMD 0x08
1061 #define IDETAPE_WRITE_CMD 0x0a
1062 #define IDETAPE_WRITE_FILEMARK_CMD 0x10
1063 #define IDETAPE_SPACE_CMD 0x11
1064 #define IDETAPE_INQUIRY_CMD 0x12
1065 #define IDETAPE_ERASE_CMD 0x19
1066 #define IDETAPE_MODE_SENSE_CMD 0x1a
1067 #define IDETAPE_MODE_SELECT_CMD 0x15
1068 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b
1069 #define IDETAPE_PREVENT_CMD 0x1e
1070 #define IDETAPE_LOCATE_CMD 0x2b
1071 #define IDETAPE_READ_POSITION_CMD 0x34
1072 #define IDETAPE_READ_BUFFER_CMD 0x3c
1073 #define IDETAPE_SET_SPEED_CMD 0xbb
1076 * Some defines for the READ BUFFER command
1078 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
1081 * Some defines for the SPACE command
1083 #define IDETAPE_SPACE_OVER_FILEMARK 1
1084 #define IDETAPE_SPACE_TO_EOD 3
1087 * Some defines for the LOAD UNLOAD command
1089 #define IDETAPE_LU_LOAD_MASK 1
1090 #define IDETAPE_LU_RETENSION_MASK 2
1091 #define IDETAPE_LU_EOT_MASK 4
1094 * Special requests for our block device strategy routine.
1096 * In order to service a character device command, we add special
1097 * requests to the tail of our block device request queue and wait
1098 * for their completion.
1102 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
1103 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
1104 REQ_IDETAPE_READ = (1 << 2),
1105 REQ_IDETAPE_WRITE = (1 << 3),
1106 REQ_IDETAPE_READ_BUFFER = (1 << 4),
1110 * Error codes which are returned in rq->errors to the higher part
1113 #define IDETAPE_ERROR_GENERAL 101
1114 #define IDETAPE_ERROR_FILEMARK 102
1115 #define IDETAPE_ERROR_EOD 103
1118 * The following is used to format the general configuration word of
1119 * the ATAPI IDENTIFY DEVICE command.
1121 struct idetape_id_gcw {
1122 unsigned packet_size :2; /* Packet Size */
1123 unsigned reserved234 :3; /* Reserved */
1124 unsigned drq_type :2; /* Command packet DRQ type */
1125 unsigned removable :1; /* Removable media */
1126 unsigned device_type :5; /* Device type */
1127 unsigned reserved13 :1; /* Reserved */
1128 unsigned protocol :2; /* Protocol type */
1132 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
1135 unsigned device_type :5; /* Peripheral Device Type */
1136 unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */
1137 unsigned reserved1_6t0 :7; /* Reserved */
1138 unsigned rmb :1; /* Removable Medium Bit */
1139 unsigned ansi_version :3; /* ANSI Version */
1140 unsigned ecma_version :3; /* ECMA Version */
1141 unsigned iso_version :2; /* ISO Version */
1142 unsigned response_format :4; /* Response Data Format */
1143 unsigned reserved3_45 :2; /* Reserved */
1144 unsigned reserved3_6 :1; /* TrmIOP - Reserved */
1145 unsigned reserved3_7 :1; /* AENC - Reserved */
1146 __u8 additional_length; /* Additional Length (total_length-4) */
1147 __u8 rsv5, rsv6, rsv7; /* Reserved */
1148 __u8 vendor_id[8]; /* Vendor Identification */
1149 __u8 product_id[16]; /* Product Identification */
1150 __u8 revision_level[4]; /* Revision Level */
1151 __u8 vendor_specific[20]; /* Vendor Specific - Optional */
1152 __u8 reserved56t95[40]; /* Reserved - Optional */
1153 /* Additional information may be returned */
1154 } idetape_inquiry_result_t;
1157 * READ POSITION packet command - Data Format (From Table 6-57)
1160 unsigned reserved0_10 :2; /* Reserved */
1161 unsigned bpu :1; /* Block Position Unknown */
1162 unsigned reserved0_543 :3; /* Reserved */
1163 unsigned eop :1; /* End Of Partition */
1164 unsigned bop :1; /* Beginning Of Partition */
1165 u8 partition; /* Partition Number */
1166 u8 reserved2, reserved3; /* Reserved */
1167 u32 first_block; /* First Block Location */
1168 u32 last_block; /* Last Block Location (Optional) */
1169 u8 reserved12; /* Reserved */
1170 u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */
1171 u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */
1172 } idetape_read_position_result_t;
1175 * Follows structures which are related to the SELECT SENSE / MODE SENSE
1176 * packet commands. Those packet commands are still not supported
1179 #define IDETAPE_BLOCK_DESCRIPTOR 0
1180 #define IDETAPE_CAPABILITIES_PAGE 0x2a
1181 #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
1182 #define IDETAPE_BLOCK_SIZE_PAGE 0x30
1183 #define IDETAPE_BUFFER_FILLING_PAGE 0x33
1186 * Mode Parameter Header for the MODE SENSE packet command
1189 __u8 mode_data_length; /* Length of the following data transfer */
1190 __u8 medium_type; /* Medium Type */
1191 __u8 dsp; /* Device Specific Parameter */
1192 __u8 bdl; /* Block Descriptor Length */
1194 /* data transfer page */
1196 __u8 reserved0_6 :1;
1197 __u8 ps :1; /* parameters saveable */
1198 __u8 page_length; /* page Length == 0x02 */
1200 __u8 read32k :1; /* 32k blk size (data only) */
1201 __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */
1202 __u8 reserved3_23 :2;
1203 __u8 write32k :1; /* 32k blk size (data only) */
1204 __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */
1205 __u8 reserved3_6 :1;
1206 __u8 streaming :1; /* streaming mode enable */
1208 } idetape_mode_parameter_header_t;
1211 * Mode Parameter Block Descriptor the MODE SENSE packet command
1213 * Support for block descriptors is optional.
1216 __u8 density_code; /* Medium density code */
1217 __u8 blocks[3]; /* Number of blocks */
1218 __u8 reserved4; /* Reserved */
1219 __u8 length[3]; /* Block Length */
1220 } idetape_parameter_block_descriptor_t;
1223 * The Data Compression Page, as returned by the MODE SENSE packet command.
1226 unsigned page_code :6; /* Page Code - Should be 0xf */
1227 unsigned reserved0 :1; /* Reserved */
1229 __u8 page_length; /* Page Length - Should be 14 */
1230 unsigned reserved2 :6; /* Reserved */
1231 unsigned dcc :1; /* Data Compression Capable */
1232 unsigned dce :1; /* Data Compression Enable */
1233 unsigned reserved3 :5; /* Reserved */
1234 unsigned red :2; /* Report Exception on Decompression */
1235 unsigned dde :1; /* Data Decompression Enable */
1236 __u32 ca; /* Compression Algorithm */
1237 __u32 da; /* Decompression Algorithm */
1238 __u8 reserved[4]; /* Reserved */
1239 } idetape_data_compression_page_t;
1242 * The Medium Partition Page, as returned by the MODE SENSE packet command.
1245 unsigned page_code :6; /* Page Code - Should be 0x11 */
1246 unsigned reserved1_6 :1; /* Reserved */
1248 __u8 page_length; /* Page Length - Should be 6 */
1249 __u8 map; /* Maximum Additional Partitions - Should be 0 */
1250 __u8 apd; /* Additional Partitions Defined - Should be 0 */
1251 unsigned reserved4_012 :3; /* Reserved */
1252 unsigned psum :2; /* Should be 0 */
1253 unsigned idp :1; /* Should be 0 */
1254 unsigned sdp :1; /* Should be 0 */
1255 unsigned fdp :1; /* Fixed Data Partitions */
1256 __u8 mfr; /* Medium Format Recognition */
1257 __u8 reserved[2]; /* Reserved */
1258 } idetape_medium_partition_page_t;
1261 * Run time configurable parameters.
1264 int dsc_rw_frequency;
1265 int dsc_media_access_frequency;
1270 * The variables below are used for the character device interface.
1271 * Additional state variables are defined in our ide_drive_t structure.
1273 static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
1275 #define ide_tape_f(file) ((file)->private_data)
1277 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
1279 struct ide_tape_obj *tape = NULL;
1281 mutex_lock(&idetape_ref_mutex);
1282 tape = idetape_devs[i];
1284 kref_get(&tape->kref);
1285 mutex_unlock(&idetape_ref_mutex);
1290 * Function declarations
1293 static int idetape_chrdev_release (struct inode *inode, struct file *filp);
1294 static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
1297 * Too bad. The drive wants to send us data which we are not ready to accept.
1298 * Just throw it away.
1300 static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
1303 (void) HWIF(drive)->INB(IDE_DATA_REG);
1306 static void idetape_input_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_input_buffers\n");
1316 idetape_discard_data(drive, bcount);
1319 #endif /* IDETAPE_DEBUG_BUGS */
1320 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
1321 HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
1323 atomic_add(count, &bh->b_count);
1324 if (atomic_read(&bh->b_count) == bh->b_size) {
1327 atomic_set(&bh->b_count, 0);
1333 static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
1335 struct idetape_bh *bh = pc->bh;
1339 #if IDETAPE_DEBUG_BUGS
1341 printk(KERN_ERR "ide-tape: bh == NULL in "
1342 "idetape_output_buffers\n");
1345 #endif /* IDETAPE_DEBUG_BUGS */
1346 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
1347 HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
1349 pc->b_data += count;
1350 pc->b_count -= count;
1352 pc->bh = bh = bh->b_reqnext;
1354 pc->b_data = bh->b_data;
1355 pc->b_count = atomic_read(&bh->b_count);
1361 static void idetape_update_buffers (idetape_pc_t *pc)
1363 struct idetape_bh *bh = pc->bh;
1365 unsigned int bcount = pc->actually_transferred;
1367 if (test_bit(PC_WRITING, &pc->flags))
1370 #if IDETAPE_DEBUG_BUGS
1372 printk(KERN_ERR "ide-tape: bh == NULL in "
1373 "idetape_update_buffers\n");
1376 #endif /* IDETAPE_DEBUG_BUGS */
1377 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
1378 atomic_set(&bh->b_count, count);
1379 if (atomic_read(&bh->b_count) == bh->b_size)
1387 * idetape_next_pc_storage returns a pointer to a place in which we can
1388 * safely store a packet command, even though we intend to leave the
1389 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
1390 * commands is allocated at initialization time.
1392 static idetape_pc_t *idetape_next_pc_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: pc_stack_index=%d\n",
1399 tape->pc_stack_index);
1400 #endif /* IDETAPE_DEBUG_LOG */
1401 if (tape->pc_stack_index == IDETAPE_PC_STACK)
1402 tape->pc_stack_index=0;
1403 return (&tape->pc_stack[tape->pc_stack_index++]);
1407 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
1408 * Since we queue packet commands in the request queue, we need to
1409 * allocate a request, along with the allocation of a packet command.
1412 /**************************************************************
1414 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
1415 * followed later on by kfree(). -ml *
1417 **************************************************************/
1419 static struct request *idetape_next_rq_storage (ide_drive_t *drive)
1421 idetape_tape_t *tape = drive->driver_data;
1423 #if IDETAPE_DEBUG_LOG
1424 if (tape->debug_level >= 5)
1425 printk(KERN_INFO "ide-tape: rq_stack_index=%d\n",
1426 tape->rq_stack_index);
1427 #endif /* IDETAPE_DEBUG_LOG */
1428 if (tape->rq_stack_index == IDETAPE_PC_STACK)
1429 tape->rq_stack_index=0;
1430 return (&tape->rq_stack[tape->rq_stack_index++]);
1434 * idetape_init_pc initializes a packet command.
1436 static void idetape_init_pc (idetape_pc_t *pc)
1438 memset(pc->c, 0, 12);
1441 pc->request_transfer = 0;
1442 pc->buffer = pc->pc_buffer;
1443 pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
1449 * idetape_analyze_error is called on each failed packet command retry
1450 * to analyze the request sense. We currently do not utilize this
1453 static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result)
1455 idetape_tape_t *tape = drive->driver_data;
1456 idetape_pc_t *pc = tape->failed_pc;
1458 tape->sense = *result;
1459 tape->sense_key = result->sense_key;
1460 tape->asc = result->asc;
1461 tape->ascq = result->ascq;
1462 #if IDETAPE_DEBUG_LOG
1464 * Without debugging, we only log an error if we decided to
1467 if (tape->debug_level >= 1)
1468 printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, "
1469 "asc = %x, ascq = %x\n",
1470 pc->c[0], result->sense_key,
1471 result->asc, result->ascq);
1472 #endif /* IDETAPE_DEBUG_LOG */
1475 * Correct pc->actually_transferred by asking the tape.
1477 if (test_bit(PC_DMA_ERROR, &pc->flags)) {
1478 pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information));
1479 idetape_update_buffers(pc);
1483 * If error was the result of a zero-length read or write command,
1484 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
1485 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
1487 if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD)
1488 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */
1489 if (result->sense_key == 5) {
1490 /* don't report an error, everything's ok */
1492 /* don't retry read/write */
1493 set_bit(PC_ABORT, &pc->flags);
1496 if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) {
1497 pc->error = IDETAPE_ERROR_FILEMARK;
1498 set_bit(PC_ABORT, &pc->flags);
1500 if (pc->c[0] == IDETAPE_WRITE_CMD) {
1502 (result->sense_key == 0xd && result->asc == 0x0 &&
1503 result->ascq == 0x2)) {
1504 pc->error = IDETAPE_ERROR_EOD;
1505 set_bit(PC_ABORT, &pc->flags);
1508 if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) {
1509 if (result->sense_key == 8) {
1510 pc->error = IDETAPE_ERROR_EOD;
1511 set_bit(PC_ABORT, &pc->flags);
1513 if (!test_bit(PC_ABORT, &pc->flags) &&
1514 pc->actually_transferred)
1515 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
1520 * idetape_active_next_stage will declare the next stage as "active".
1522 static void idetape_active_next_stage (ide_drive_t *drive)
1524 idetape_tape_t *tape = drive->driver_data;
1525 idetape_stage_t *stage = tape->next_stage;
1526 struct request *rq = &stage->rq;
1528 #if IDETAPE_DEBUG_LOG
1529 if (tape->debug_level >= 4)
1530 printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n");
1531 #endif /* IDETAPE_DEBUG_LOG */
1532 #if IDETAPE_DEBUG_BUGS
1533 if (stage == NULL) {
1534 printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n");
1537 #endif /* IDETAPE_DEBUG_BUGS */
1539 rq->rq_disk = tape->disk;
1541 rq->special = (void *)stage->bh;
1542 tape->active_data_request = rq;
1543 tape->active_stage = stage;
1544 tape->next_stage = stage->next;
1548 * idetape_increase_max_pipeline_stages is a part of the feedback
1549 * loop which tries to find the optimum number of stages. In the
1550 * feedback loop, we are starting from a minimum maximum number of
1551 * stages, and if we sense that the pipeline is empty, we try to
1552 * increase it, until we reach the user compile time memory limit.
1554 static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
1556 idetape_tape_t *tape = drive->driver_data;
1557 int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
1559 #if IDETAPE_DEBUG_LOG
1560 if (tape->debug_level >= 4)
1561 printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n");
1562 #endif /* IDETAPE_DEBUG_LOG */
1564 tape->max_stages += max(increase, 1);
1565 tape->max_stages = max(tape->max_stages, tape->min_pipeline);
1566 tape->max_stages = min(tape->max_stages, tape->max_pipeline);
1570 * idetape_kfree_stage calls kfree to completely free a stage, along with
1571 * its related buffers.
1573 static void __idetape_kfree_stage (idetape_stage_t *stage)
1575 struct idetape_bh *prev_bh, *bh = stage->bh;
1578 while (bh != NULL) {
1579 if (bh->b_data != NULL) {
1580 size = (int) bh->b_size;
1582 free_page((unsigned long) bh->b_data);
1584 bh->b_data += PAGE_SIZE;
1594 static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
1596 __idetape_kfree_stage(stage);
1600 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1601 * The caller should avoid race conditions.
1603 static void idetape_remove_stage_head (ide_drive_t *drive)
1605 idetape_tape_t *tape = drive->driver_data;
1606 idetape_stage_t *stage;
1608 #if IDETAPE_DEBUG_LOG
1609 if (tape->debug_level >= 4)
1610 printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n");
1611 #endif /* IDETAPE_DEBUG_LOG */
1612 #if IDETAPE_DEBUG_BUGS
1613 if (tape->first_stage == NULL) {
1614 printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
1617 if (tape->active_stage == tape->first_stage) {
1618 printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n");
1621 #endif /* IDETAPE_DEBUG_BUGS */
1622 stage = tape->first_stage;
1623 tape->first_stage = stage->next;
1624 idetape_kfree_stage(tape, stage);
1626 if (tape->first_stage == NULL) {
1627 tape->last_stage = NULL;
1628 #if IDETAPE_DEBUG_BUGS
1629 if (tape->next_stage != NULL)
1630 printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
1631 if (tape->nr_stages)
1632 printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
1633 #endif /* IDETAPE_DEBUG_BUGS */
1638 * This will free all the pipeline stages starting from new_last_stage->next
1639 * to the end of the list, and point tape->last_stage to new_last_stage.
1641 static void idetape_abort_pipeline(ide_drive_t *drive,
1642 idetape_stage_t *new_last_stage)
1644 idetape_tape_t *tape = drive->driver_data;
1645 idetape_stage_t *stage = new_last_stage->next;
1646 idetape_stage_t *nstage;
1648 #if IDETAPE_DEBUG_LOG
1649 if (tape->debug_level >= 4)
1650 printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name);
1653 nstage = stage->next;
1654 idetape_kfree_stage(tape, stage);
1656 --tape->nr_pending_stages;
1660 new_last_stage->next = NULL;
1661 tape->last_stage = new_last_stage;
1662 tape->next_stage = NULL;
1666 * idetape_end_request is used to finish servicing a request, and to
1667 * insert a pending pipeline request into the main device queue.
1669 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
1671 struct request *rq = HWGROUP(drive)->rq;
1672 idetape_tape_t *tape = drive->driver_data;
1673 unsigned long flags;
1675 int remove_stage = 0;
1676 idetape_stage_t *active_stage;
1678 #if IDETAPE_DEBUG_LOG
1679 if (tape->debug_level >= 4)
1680 printk(KERN_INFO "ide-tape: Reached idetape_end_request\n");
1681 #endif /* IDETAPE_DEBUG_LOG */
1684 case 0: error = IDETAPE_ERROR_GENERAL; break;
1685 case 1: error = 0; break;
1686 default: error = uptodate;
1690 tape->failed_pc = NULL;
1692 if (!blk_special_request(rq)) {
1693 ide_end_request(drive, uptodate, nr_sects);
1697 spin_lock_irqsave(&tape->spinlock, flags);
1699 /* The request was a pipelined data transfer request */
1700 if (tape->active_data_request == rq) {
1701 active_stage = tape->active_stage;
1702 tape->active_stage = NULL;
1703 tape->active_data_request = NULL;
1704 tape->nr_pending_stages--;
1705 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
1708 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1709 if (error == IDETAPE_ERROR_EOD)
1710 idetape_abort_pipeline(drive, active_stage);
1712 } else if (rq->cmd[0] & REQ_IDETAPE_READ) {
1713 if (error == IDETAPE_ERROR_EOD) {
1714 set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
1715 idetape_abort_pipeline(drive, active_stage);
1718 if (tape->next_stage != NULL) {
1719 idetape_active_next_stage(drive);
1722 * Insert the next request into the request queue.
1724 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
1725 } else if (!error) {
1726 idetape_increase_max_pipeline_stages(drive);
1729 ide_end_drive_cmd(drive, 0, 0);
1730 // blkdev_dequeue_request(rq);
1731 // drive->rq = NULL;
1732 // end_that_request_last(rq);
1735 idetape_remove_stage_head(drive);
1736 if (tape->active_data_request == NULL)
1737 clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
1738 spin_unlock_irqrestore(&tape->spinlock, flags);
1742 static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
1744 idetape_tape_t *tape = drive->driver_data;
1746 #if IDETAPE_DEBUG_LOG
1747 if (tape->debug_level >= 4)
1748 printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n");
1749 #endif /* IDETAPE_DEBUG_LOG */
1750 if (!tape->pc->error) {
1751 idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer);
1752 idetape_end_request(drive, 1, 0);
1754 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1755 idetape_end_request(drive, 0, 0);
1760 static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
1762 idetape_init_pc(pc);
1763 pc->c[0] = IDETAPE_REQUEST_SENSE_CMD;
1765 pc->request_transfer = 20;
1766 pc->callback = &idetape_request_sense_callback;
1769 static void idetape_init_rq(struct request *rq, u8 cmd)
1771 memset(rq, 0, sizeof(*rq));
1772 rq->cmd_type = REQ_TYPE_SPECIAL;
1777 * idetape_queue_pc_head generates a new packet command request in front
1778 * of the request queue, before the current request, so that it will be
1779 * processed immediately, on the next pass through the driver.
1781 * idetape_queue_pc_head is called from the request handling part of
1782 * the driver (the "bottom" part). Safe storage for the request should
1783 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1784 * before calling idetape_queue_pc_head.
1786 * Memory for those requests is pre-allocated at initialization time, and
1787 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1788 * space for the maximum possible number of inter-dependent packet commands.
1790 * The higher level of the driver - The ioctl handler and the character
1791 * device handling functions should queue request to the lower level part
1792 * and wait for their completion using idetape_queue_pc_tail or
1793 * idetape_queue_rw_tail.
1795 static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
1797 struct ide_tape_obj *tape = drive->driver_data;
1799 idetape_init_rq(rq, REQ_IDETAPE_PC1);
1800 rq->buffer = (char *) pc;
1801 rq->rq_disk = tape->disk;
1802 (void) ide_do_drive_cmd(drive, rq, ide_preempt);
1806 * idetape_retry_pc is called when an error was detected during the
1807 * last packet command. We queue a request sense packet command in
1808 * the head of the request list.
1810 static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
1812 idetape_tape_t *tape = drive->driver_data;
1816 (void)drive->hwif->INB(IDE_ERROR_REG);
1817 pc = idetape_next_pc_storage(drive);
1818 rq = idetape_next_rq_storage(drive);
1819 idetape_create_request_sense_cmd(pc);
1820 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
1821 idetape_queue_pc_head(drive, pc, rq);
1826 * idetape_postpone_request postpones the current request so that
1827 * ide.c will be able to service requests from another device on
1828 * the same hwgroup while we are polling for DSC.
1830 static void idetape_postpone_request (ide_drive_t *drive)
1832 idetape_tape_t *tape = drive->driver_data;
1834 #if IDETAPE_DEBUG_LOG
1835 if (tape->debug_level >= 4)
1836 printk(KERN_INFO "ide-tape: idetape_postpone_request\n");
1838 tape->postponed_rq = HWGROUP(drive)->rq;
1839 ide_stall_queue(drive, tape->dsc_polling_frequency);
1843 * idetape_pc_intr is the usual interrupt handler which will be called
1844 * during a packet command. We will transfer some of the data (as
1845 * requested by the drive) and will re-point interrupt handler to us.
1846 * When data transfer is finished, we will act according to the
1847 * algorithm described before idetape_issue_packet_command.
1850 static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
1852 ide_hwif_t *hwif = drive->hwif;
1853 idetape_tape_t *tape = drive->driver_data;
1854 idetape_pc_t *pc = tape->pc;
1857 static int error_sim_count = 0;
1862 #if IDETAPE_DEBUG_LOG
1863 if (tape->debug_level >= 4)
1864 printk(KERN_INFO "ide-tape: Reached idetape_pc_intr "
1865 "interrupt handler\n");
1866 #endif /* IDETAPE_DEBUG_LOG */
1868 /* Clear the interrupt */
1869 stat = hwif->INB(IDE_STATUS_REG);
1871 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1872 if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
1874 * A DMA error is sometimes expected. For example,
1875 * if the tape is crossing a filemark during a
1876 * READ command, it will issue an irq and position
1877 * itself before the filemark, so that only a partial
1878 * data transfer will occur (which causes the DMA
1879 * error). In that case, we will later ask the tape
1880 * how much bytes of the original request were
1881 * actually transferred (we can't receive that
1882 * information from the DMA engine on most chipsets).
1886 * On the contrary, a DMA error is never expected;
1887 * it usually indicates a hardware error or abort.
1888 * If the tape crosses a filemark during a READ
1889 * command, it will issue an irq and position itself
1890 * after the filemark (not before). Only a partial
1891 * data transfer will occur, but no DMA error.
1894 set_bit(PC_DMA_ERROR, &pc->flags);
1896 pc->actually_transferred = pc->request_transfer;
1897 idetape_update_buffers(pc);
1899 #if IDETAPE_DEBUG_LOG
1900 if (tape->debug_level >= 4)
1901 printk(KERN_INFO "ide-tape: DMA finished\n");
1902 #endif /* IDETAPE_DEBUG_LOG */
1905 /* No more interrupts */
1906 if ((stat & DRQ_STAT) == 0) {
1907 #if IDETAPE_DEBUG_LOG
1908 if (tape->debug_level >= 2)
1909 printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred);
1910 #endif /* IDETAPE_DEBUG_LOG */
1911 clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1916 if ((pc->c[0] == IDETAPE_WRITE_CMD ||
1917 pc->c[0] == IDETAPE_READ_CMD) &&
1918 (++error_sim_count % 100) == 0) {
1919 printk(KERN_INFO "ide-tape: %s: simulating error\n",
1924 if ((stat & ERR_STAT) && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD)
1926 if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
1927 /* Error detected */
1928 #if IDETAPE_DEBUG_LOG
1929 if (tape->debug_level >= 1)
1930 printk(KERN_INFO "ide-tape: %s: I/O error\n",
1932 #endif /* IDETAPE_DEBUG_LOG */
1933 if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
1934 printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
1935 return ide_do_reset(drive);
1937 #if IDETAPE_DEBUG_LOG
1938 if (tape->debug_level >= 1)
1939 printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]);
1941 /* Retry operation */
1942 return idetape_retry_pc(drive);
1945 if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
1946 (stat & SEEK_STAT) == 0) {
1947 /* Media access command */
1948 tape->dsc_polling_start = jiffies;
1949 tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
1950 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
1951 /* Allow ide.c to handle other requests */
1952 idetape_postpone_request(drive);
1955 if (tape->failed_pc == pc)
1956 tape->failed_pc = NULL;
1957 /* Command finished - Call the callback function */
1958 return pc->callback(drive);
1960 if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
1961 printk(KERN_ERR "ide-tape: The tape wants to issue more "
1962 "interrupts in DMA mode\n");
1963 printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
1965 return ide_do_reset(drive);
1967 /* Get the number of bytes to transfer on this interrupt. */
1968 bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
1969 hwif->INB(IDE_BCOUNTL_REG);
1971 ireason = hwif->INB(IDE_IREASON_REG);
1974 printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
1975 return ide_do_reset(drive);
1977 if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
1978 /* Hopefully, we will never get here */
1979 printk(KERN_ERR "ide-tape: We wanted to %s, ",
1980 (ireason & IO) ? "Write" : "Read");
1981 printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
1982 (ireason & IO) ? "Read" : "Write");
1983 return ide_do_reset(drive);
1985 if (!test_bit(PC_WRITING, &pc->flags)) {
1986 /* Reading - Check that we have enough space */
1987 temp = pc->actually_transferred + bcount;
1988 if (temp > pc->request_transfer) {
1989 if (temp > pc->buffer_size) {
1990 printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
1991 idetape_discard_data(drive, bcount);
1992 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
1995 #if IDETAPE_DEBUG_LOG
1996 if (tape->debug_level >= 2)
1997 printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1998 #endif /* IDETAPE_DEBUG_LOG */
2001 if (test_bit(PC_WRITING, &pc->flags)) {
2003 idetape_output_buffers(drive, pc, bcount);
2005 /* Write the current buffer */
2006 hwif->atapi_output_bytes(drive, pc->current_position,
2010 idetape_input_buffers(drive, pc, bcount);
2012 /* Read the current buffer */
2013 hwif->atapi_input_bytes(drive, pc->current_position,
2016 /* Update the current position */
2017 pc->actually_transferred += bcount;
2018 pc->current_position += bcount;
2019 #if IDETAPE_DEBUG_LOG
2020 if (tape->debug_level >= 2)
2021 printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes "
2022 "on that interrupt\n", pc->c[0], bcount);
2024 /* And set the interrupt handler again */
2025 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2030 * Packet Command Interface
2032 * The current Packet Command is available in tape->pc, and will not
2033 * change until we finish handling it. Each packet command is associated
2034 * with a callback function that will be called when the command is
2037 * The handling will be done in three stages:
2039 * 1. idetape_issue_packet_command will send the packet command to the
2040 * drive, and will set the interrupt handler to idetape_pc_intr.
2042 * 2. On each interrupt, idetape_pc_intr will be called. This step
2043 * will be repeated until the device signals us that no more
2044 * interrupts will be issued.
2046 * 3. ATAPI Tape media access commands have immediate status with a
2047 * delayed process. In case of a successful initiation of a
2048 * media access packet command, the DSC bit will be set when the
2049 * actual execution of the command is finished.
2050 * Since the tape drive will not issue an interrupt, we have to
2051 * poll for this event. In this case, we define the request as
2052 * "low priority request" by setting rq_status to
2053 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
2056 * ide.c will then give higher priority to requests which
2057 * originate from the other device, until will change rq_status
2060 * 4. When the packet command is finished, it will be checked for errors.
2062 * 5. In case an error was found, we queue a request sense packet
2063 * command in front of the request queue and retry the operation
2064 * up to IDETAPE_MAX_PC_RETRIES times.
2066 * 6. In case no error was found, or we decided to give up and not
2067 * to retry again, the callback function will be called and then
2068 * we will handle the next request.
2071 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
2073 ide_hwif_t *hwif = drive->hwif;
2074 idetape_tape_t *tape = drive->driver_data;
2075 idetape_pc_t *pc = tape->pc;
2077 ide_startstop_t startstop;
2080 if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
2081 printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
2084 ireason = hwif->INB(IDE_IREASON_REG);
2085 while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
2086 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
2087 "a packet command, retrying\n");
2089 ireason = hwif->INB(IDE_IREASON_REG);
2091 printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
2092 "issuing a packet command, ignoring\n");
2097 if ((ireason & CD) == 0 || (ireason & IO)) {
2098 printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
2099 "a packet command\n");
2100 return ide_do_reset(drive);
2102 /* Set the interrupt routine */
2103 ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
2104 #ifdef CONFIG_BLK_DEV_IDEDMA
2105 /* Begin DMA, if necessary */
2106 if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
2107 hwif->dma_start(drive);
2109 /* Send the actual packet */
2110 HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
2114 static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
2116 ide_hwif_t *hwif = drive->hwif;
2117 idetape_tape_t *tape = drive->driver_data;
2121 #if IDETAPE_DEBUG_BUGS
2122 if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD &&
2123 pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2124 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
2125 "Two request sense in serial were issued\n");
2127 #endif /* IDETAPE_DEBUG_BUGS */
2129 if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD)
2130 tape->failed_pc = pc;
2131 /* Set the current packet command */
2134 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
2135 test_bit(PC_ABORT, &pc->flags)) {
2137 * We will "abort" retrying a packet command in case
2138 * a legitimate error code was received (crossing a
2139 * filemark, or end of the media, for example).
2141 if (!test_bit(PC_ABORT, &pc->flags)) {
2142 if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD &&
2143 tape->sense_key == 2 && tape->asc == 4 &&
2144 (tape->ascq == 1 || tape->ascq == 8))) {
2145 printk(KERN_ERR "ide-tape: %s: I/O error, "
2146 "pc = %2x, key = %2x, "
2147 "asc = %2x, ascq = %2x\n",
2148 tape->name, pc->c[0],
2149 tape->sense_key, tape->asc,
2153 pc->error = IDETAPE_ERROR_GENERAL;
2155 tape->failed_pc = NULL;
2156 return pc->callback(drive);
2158 #if IDETAPE_DEBUG_LOG
2159 if (tape->debug_level >= 2)
2160 printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]);
2161 #endif /* IDETAPE_DEBUG_LOG */
2164 /* We haven't transferred any data yet */
2165 pc->actually_transferred = 0;
2166 pc->current_position = pc->buffer;
2167 /* Request to transfer the entire buffer at once */
2168 bcount = pc->request_transfer;
2170 if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
2171 printk(KERN_WARNING "ide-tape: DMA disabled, "
2172 "reverting to PIO\n");
2175 if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
2176 dma_ok = !hwif->dma_setup(drive);
2178 ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
2179 IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
2181 if (dma_ok) /* Will begin DMA later */
2182 set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
2183 if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
2184 ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL);
2185 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2188 hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
2189 return idetape_transfer_pc(drive);
2194 * General packet command callback function.
2196 static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
2198 idetape_tape_t *tape = drive->driver_data;
2200 #if IDETAPE_DEBUG_LOG
2201 if (tape->debug_level >= 4)
2202 printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n");
2203 #endif /* IDETAPE_DEBUG_LOG */
2205 idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
2210 * A mode sense command is used to "sense" tape parameters.
2212 static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
2214 idetape_init_pc(pc);
2215 pc->c[0] = IDETAPE_MODE_SENSE_CMD;
2216 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
2217 pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
2218 pc->c[2] = page_code;
2220 * Changed pc->c[3] to 0 (255 will at best return unused info).
2222 * For SCSI this byte is defined as subpage instead of high byte
2223 * of length and some IDE drives seem to interpret it this way
2224 * and return an error when 255 is used.
2227 pc->c[4] = 255; /* (We will just discard data in that case) */
2228 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
2229 pc->request_transfer = 12;
2230 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
2231 pc->request_transfer = 24;
2233 pc->request_transfer = 50;
2234 pc->callback = &idetape_pc_callback;
2237 static void calculate_speeds(ide_drive_t *drive)
2239 idetape_tape_t *tape = drive->driver_data;
2240 int full = 125, empty = 75;
2242 if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
2243 tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
2244 tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
2245 tape->controlled_last_pipeline_head = tape->pipeline_head;
2246 tape->controlled_pipeline_head_time = jiffies;
2248 if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
2249 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
2250 else if (time_after(jiffies, tape->controlled_previous_head_time))
2251 tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
2253 if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
2254 /* -1 for read mode error recovery */
2255 if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
2256 tape->uncontrolled_pipeline_head_time = jiffies;
2257 tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
2260 tape->uncontrolled_previous_head_time = jiffies;
2261 tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
2262 if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
2263 tape->uncontrolled_pipeline_head_time = jiffies;
2266 tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
2267 if (tape->speed_control == 0) {
2268 tape->max_insert_speed = 5000;
2269 } else if (tape->speed_control == 1) {
2270 if (tape->nr_pending_stages >= tape->max_stages / 2)
2271 tape->max_insert_speed = tape->pipeline_head_speed +
2272 (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
2274 tape->max_insert_speed = 500 +
2275 (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
2276 if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
2277 tape->max_insert_speed = 5000;
2278 } else if (tape->speed_control == 2) {
2279 tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
2280 (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
2282 tape->max_insert_speed = tape->speed_control;
2283 tape->max_insert_speed = max(tape->max_insert_speed, 500);
2286 static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
2288 idetape_tape_t *tape = drive->driver_data;
2289 idetape_pc_t *pc = tape->pc;
2292 stat = drive->hwif->INB(IDE_STATUS_REG);
2293 if (stat & SEEK_STAT) {
2294 if (stat & ERR_STAT) {
2295 /* Error detected */
2296 if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD)
2297 printk(KERN_ERR "ide-tape: %s: I/O error, ",
2299 /* Retry operation */
2300 return idetape_retry_pc(drive);
2303 if (tape->failed_pc == pc)
2304 tape->failed_pc = NULL;
2306 pc->error = IDETAPE_ERROR_GENERAL;
2307 tape->failed_pc = NULL;
2309 return pc->callback(drive);
2312 static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
2314 idetape_tape_t *tape = drive->driver_data;
2315 struct request *rq = HWGROUP(drive)->rq;
2316 int blocks = tape->pc->actually_transferred / tape->tape_block_size;
2318 tape->avg_size += blocks * tape->tape_block_size;
2319 tape->insert_size += blocks * tape->tape_block_size;
2320 if (tape->insert_size > 1024 * 1024)
2321 tape->measure_insert_time = 1;
2322 if (tape->measure_insert_time) {
2323 tape->measure_insert_time = 0;
2324 tape->insert_time = jiffies;
2325 tape->insert_size = 0;
2327 if (time_after(jiffies, tape->insert_time))
2328 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2329 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
2330 tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
2332 tape->avg_time = jiffies;
2335 #if IDETAPE_DEBUG_LOG
2336 if (tape->debug_level >= 4)
2337 printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n");
2338 #endif /* IDETAPE_DEBUG_LOG */
2340 tape->first_frame_position += blocks;
2341 rq->current_nr_sectors -= blocks;
2343 if (!tape->pc->error)
2344 idetape_end_request(drive, 1, 0);
2346 idetape_end_request(drive, tape->pc->error, 0);
2350 static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2352 idetape_init_pc(pc);
2353 pc->c[0] = IDETAPE_READ_CMD;
2354 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2356 pc->callback = &idetape_rw_callback;
2358 atomic_set(&bh->b_count, 0);
2360 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2361 if (pc->request_transfer == tape->stage_size)
2362 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2365 static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2368 struct idetape_bh *p = bh;
2370 idetape_init_pc(pc);
2371 pc->c[0] = IDETAPE_READ_BUFFER_CMD;
2372 pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
2373 pc->c[7] = size >> 8;
2374 pc->c[8] = size & 0xff;
2375 pc->callback = &idetape_pc_callback;
2377 atomic_set(&bh->b_count, 0);
2380 atomic_set(&p->b_count, 0);
2383 pc->request_transfer = pc->buffer_size = size;
2386 static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
2388 idetape_init_pc(pc);
2389 pc->c[0] = IDETAPE_WRITE_CMD;
2390 put_unaligned(htonl(length), (unsigned int *) &pc->c[1]);
2392 pc->callback = &idetape_rw_callback;
2393 set_bit(PC_WRITING, &pc->flags);
2395 pc->b_data = bh->b_data;
2396 pc->b_count = atomic_read(&bh->b_count);
2398 pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
2399 if (pc->request_transfer == tape->stage_size)
2400 set_bit(PC_DMA_RECOMMENDED, &pc->flags);
2404 * idetape_do_request is our request handling function.
2406 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
2407 struct request *rq, sector_t block)
2409 idetape_tape_t *tape = drive->driver_data;
2410 idetape_pc_t *pc = NULL;
2411 struct request *postponed_rq = tape->postponed_rq;
2414 #if IDETAPE_DEBUG_LOG
2416 if (tape->debug_level >= 5)
2417 printk(KERN_INFO "ide-tape: %d, "
2418 "dev: %s, cmd: %ld, errors: %d\n",
2419 rq->rq_disk->disk_name, rq->cmd[0], rq->errors);
2421 if (tape->debug_level >= 2)
2422 printk(KERN_INFO "ide-tape: sector: %ld, "
2423 "nr_sectors: %ld, current_nr_sectors: %d\n",
2424 rq->sector, rq->nr_sectors, rq->current_nr_sectors);
2425 #endif /* IDETAPE_DEBUG_LOG */
2427 if (!blk_special_request(rq)) {
2429 * We do not support buffer cache originated requests.
2431 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
2432 "request queue (%d)\n", drive->name, rq->cmd_type);
2433 ide_end_request(drive, 0, 0);
2438 * Retry a failed packet command
2440 if (tape->failed_pc != NULL &&
2441 tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) {
2442 return idetape_issue_packet_command(drive, tape->failed_pc);
2444 #if IDETAPE_DEBUG_BUGS
2445 if (postponed_rq != NULL)
2446 if (rq != postponed_rq) {
2447 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
2448 "Two DSC requests were queued\n");
2449 idetape_end_request(drive, 0, 0);
2452 #endif /* IDETAPE_DEBUG_BUGS */
2454 tape->postponed_rq = NULL;
2457 * If the tape is still busy, postpone our request and service
2458 * the other device meanwhile.
2460 stat = drive->hwif->INB(IDE_STATUS_REG);
2462 if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
2463 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
2465 if (drive->post_reset == 1) {
2466 set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
2467 drive->post_reset = 0;
2470 if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
2471 tape->measure_insert_time = 1;
2472 if (time_after(jiffies, tape->insert_time))
2473 tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
2474 calculate_speeds(drive);
2475 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
2476 (stat & SEEK_STAT) == 0) {
2477 if (postponed_rq == NULL) {
2478 tape->dsc_polling_start = jiffies;
2479 tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
2480 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
2481 } else if (time_after(jiffies, tape->dsc_timeout)) {
2482 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
2484 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2485 idetape_media_access_finished(drive);
2488 return ide_do_reset(drive);
2490 } else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
2491 tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
2492 idetape_postpone_request(drive);
2495 if (rq->cmd[0] & REQ_IDETAPE_READ) {
2496 tape->buffer_head++;
2497 tape->postpone_cnt = 0;
2498 pc = idetape_next_pc_storage(drive);
2499 idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2502 if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
2503 tape->buffer_head++;
2504 tape->postpone_cnt = 0;
2505 pc = idetape_next_pc_storage(drive);
2506 idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2509 if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
2510 tape->postpone_cnt = 0;
2511 pc = idetape_next_pc_storage(drive);
2512 idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
2515 if (rq->cmd[0] & REQ_IDETAPE_PC1) {
2516 pc = (idetape_pc_t *) rq->buffer;
2517 rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
2518 rq->cmd[0] |= REQ_IDETAPE_PC2;
2521 if (rq->cmd[0] & REQ_IDETAPE_PC2) {
2522 idetape_media_access_finished(drive);
2527 return idetape_issue_packet_command(drive, pc);
2531 * Pipeline related functions
2533 static inline int idetape_pipeline_active (idetape_tape_t *tape)
2537 rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
2538 rc2 = (tape->active_data_request != NULL);
2543 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
2544 * stage, along with all the necessary small buffers which together make
2545 * a buffer of size tape->stage_size (or a bit more). We attempt to
2546 * combine sequential pages as much as possible.
2548 * Returns a pointer to the new allocated stage, or NULL if we
2549 * can't (or don't want to) allocate a stage.
2551 * Pipeline stages are optional and are used to increase performance.
2552 * If we can't allocate them, we'll manage without them.
2554 static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
2556 idetape_stage_t *stage;
2557 struct idetape_bh *prev_bh, *bh;
2558 int pages = tape->pages_per_stage;
2559 char *b_data = NULL;
2561 if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
2565 bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
2568 bh->b_reqnext = NULL;
2569 if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2572 memset(bh->b_data, 0, PAGE_SIZE);
2573 bh->b_size = PAGE_SIZE;
2574 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2577 if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
2580 memset(b_data, 0, PAGE_SIZE);
2581 if (bh->b_data == b_data + PAGE_SIZE) {
2582 bh->b_size += PAGE_SIZE;
2583 bh->b_data -= PAGE_SIZE;
2585 atomic_add(PAGE_SIZE, &bh->b_count);
2588 if (b_data == bh->b_data + bh->b_size) {
2589 bh->b_size += PAGE_SIZE;
2591 atomic_add(PAGE_SIZE, &bh->b_count);
2595 if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
2596 free_page((unsigned long) b_data);
2599 bh->b_reqnext = NULL;
2600 bh->b_data = b_data;
2601 bh->b_size = PAGE_SIZE;
2602 atomic_set(&bh->b_count, full ? bh->b_size : 0);
2603 prev_bh->b_reqnext = bh;
2605 bh->b_size -= tape->excess_bh_size;
2607 atomic_sub(tape->excess_bh_size, &bh->b_count);
2610 __idetape_kfree_stage(stage);
2614 static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
2616 idetape_stage_t *cache_stage = tape->cache_stage;
2618 #if IDETAPE_DEBUG_LOG
2619 if (tape->debug_level >= 4)
2620 printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n");
2621 #endif /* IDETAPE_DEBUG_LOG */
2623 if (tape->nr_stages >= tape->max_stages)
2625 if (cache_stage != NULL) {
2626 tape->cache_stage = NULL;
2629 return __idetape_kmalloc_stage(tape, 0, 0);
2632 static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
2634 struct idetape_bh *bh = tape->bh;
2639 #if IDETAPE_DEBUG_BUGS
2641 printk(KERN_ERR "ide-tape: bh == NULL in "
2642 "idetape_copy_stage_from_user\n");
2645 #endif /* IDETAPE_DEBUG_BUGS */
2646 count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
2647 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
2650 atomic_add(count, &bh->b_count);
2652 if (atomic_read(&bh->b_count) == bh->b_size) {
2655 atomic_set(&bh->b_count, 0);
2662 static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
2664 struct idetape_bh *bh = tape->bh;
2669 #if IDETAPE_DEBUG_BUGS
2671 printk(KERN_ERR "ide-tape: bh == NULL in "
2672 "idetape_copy_stage_to_user\n");
2675 #endif /* IDETAPE_DEBUG_BUGS */
2676 count = min(tape->b_count, n);
2677 if (copy_to_user(buf, tape->b_data, count))
2680 tape->b_data += count;
2681 tape->b_count -= count;
2683 if (!tape->b_count) {
2684 tape->bh = bh = bh->b_reqnext;
2686 tape->b_data = bh->b_data;
2687 tape->b_count = atomic_read(&bh->b_count);
2694 static void idetape_init_merge_stage (idetape_tape_t *tape)
2696 struct idetape_bh *bh = tape->merge_stage->bh;
2699 if (tape->chrdev_direction == idetape_direction_write)
2700 atomic_set(&bh->b_count, 0);
2702 tape->b_data = bh->b_data;
2703 tape->b_count = atomic_read(&bh->b_count);
2707 static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
2709 struct idetape_bh *tmp;
2712 stage->bh = tape->merge_stage->bh;
2713 tape->merge_stage->bh = tmp;
2714 idetape_init_merge_stage(tape);
2718 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2720 static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
2722 idetape_tape_t *tape = drive->driver_data;
2723 unsigned long flags;
2725 #if IDETAPE_DEBUG_LOG
2726 if (tape->debug_level >= 4)
2727 printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n");
2728 #endif /* IDETAPE_DEBUG_LOG */
2729 spin_lock_irqsave(&tape->spinlock, flags);
2731 if (tape->last_stage != NULL)
2732 tape->last_stage->next=stage;
2734 tape->first_stage = tape->next_stage=stage;
2735 tape->last_stage = stage;
2736 if (tape->next_stage == NULL)
2737 tape->next_stage = tape->last_stage;
2739 tape->nr_pending_stages++;
2740 spin_unlock_irqrestore(&tape->spinlock, flags);
2744 * idetape_wait_for_request installs a completion in a pending request
2745 * and sleeps until it is serviced.
2747 * The caller should ensure that the request will not be serviced
2748 * before we install the completion (usually by disabling interrupts).
2750 static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
2752 DECLARE_COMPLETION_ONSTACK(wait);
2753 idetape_tape_t *tape = drive->driver_data;
2755 #if IDETAPE_DEBUG_BUGS
2756 if (rq == NULL || !blk_special_request(rq)) {
2757 printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
2760 #endif /* IDETAPE_DEBUG_BUGS */
2761 rq->end_io_data = &wait;
2762 rq->end_io = blk_end_sync_rq;
2763 spin_unlock_irq(&tape->spinlock);
2764 wait_for_completion(&wait);
2765 /* The stage and its struct request have been deallocated */
2766 spin_lock_irq(&tape->spinlock);
2769 static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive)
2771 idetape_tape_t *tape = drive->driver_data;
2772 idetape_read_position_result_t *result;
2774 #if IDETAPE_DEBUG_LOG
2775 if (tape->debug_level >= 4)
2776 printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n");
2777 #endif /* IDETAPE_DEBUG_LOG */
2779 if (!tape->pc->error) {
2780 result = (idetape_read_position_result_t *) tape->pc->buffer;
2781 #if IDETAPE_DEBUG_LOG
2782 if (tape->debug_level >= 2)
2783 printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No");
2784 if (tape->debug_level >= 2)
2785 printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No");
2786 #endif /* IDETAPE_DEBUG_LOG */
2788 printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n");
2789 clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2790 idetape_end_request(drive, 0, 0);
2792 #if IDETAPE_DEBUG_LOG
2793 if (tape->debug_level >= 2)
2794 printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block));
2795 #endif /* IDETAPE_DEBUG_LOG */
2796 tape->partition = result->partition;
2797 tape->first_frame_position = ntohl(result->first_block);
2798 tape->last_frame_position = ntohl(result->last_block);
2799 tape->blocks_in_buffer = result->blocks_in_buffer[2];
2800 set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
2801 idetape_end_request(drive, 1, 0);
2804 idetape_end_request(drive, 0, 0);
2810 * idetape_create_write_filemark_cmd will:
2812 * 1. Write a filemark if write_filemark=1.
2813 * 2. Flush the device buffers without writing a filemark
2814 * if write_filemark=0.
2817 static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
2819 idetape_init_pc(pc);
2820 pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD;
2821 pc->c[4] = write_filemark;
2822 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2823 pc->callback = &idetape_pc_callback;
2826 static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
2828 idetape_init_pc(pc);
2829 pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD;
2830 pc->callback = &idetape_pc_callback;
2834 * idetape_queue_pc_tail is based on the following functions:
2836 * ide_do_drive_cmd from ide.c
2837 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2839 * We add a special packet command request to the tail of the request
2840 * queue, and wait for it to be serviced.
2842 * This is not to be called from within the request handling part
2843 * of the driver ! We allocate here data in the stack, and it is valid
2844 * until the request is finished. This is not the case for the bottom
2845 * part of the driver, where we are always leaving the functions to wait
2846 * for an interrupt or a timer event.
2848 * From the bottom part of the driver, we should allocate safe memory
2849 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2850 * the request to the request list without waiting for it to be serviced !
2851 * In that case, we usually use idetape_queue_pc_head.
2853 static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
2855 struct ide_tape_obj *tape = drive->driver_data;
2858 idetape_init_rq(&rq, REQ_IDETAPE_PC1);
2859 rq.buffer = (char *) pc;
2860 rq.rq_disk = tape->disk;
2861 return ide_do_drive_cmd(drive, &rq, ide_wait);
2864 static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
2866 idetape_init_pc(pc);
2867 pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD;
2869 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2870 pc->callback = &idetape_pc_callback;
2873 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
2875 idetape_tape_t *tape = drive->driver_data;
2877 int load_attempted = 0;
2880 * Wait for the tape to become ready
2882 set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
2884 while (time_before(jiffies, timeout)) {
2885 idetape_create_test_unit_ready_cmd(&pc);
2886 if (!__idetape_queue_pc_tail(drive, &pc))
2888 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
2889 || (tape->asc == 0x3A)) { /* no media */
2892 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
2893 __idetape_queue_pc_tail(drive, &pc);
2895 /* not about to be ready */
2896 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
2897 (tape->ascq == 1 || tape->ascq == 8)))
2904 static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
2906 return __idetape_queue_pc_tail(drive, pc);
2909 static int idetape_flush_tape_buffers (ide_drive_t *drive)
2914 idetape_create_write_filemark_cmd(drive, &pc, 0);
2915 if ((rc = idetape_queue_pc_tail(drive, &pc)))
2917 idetape_wait_ready(drive, 60 * 5 * HZ);
2921 static void idetape_create_read_position_cmd (idetape_pc_t *pc)
2923 idetape_init_pc(pc);
2924 pc->c[0] = IDETAPE_READ_POSITION_CMD;
2925 pc->request_transfer = 20;
2926 pc->callback = &idetape_read_position_callback;
2929 static int idetape_read_position (ide_drive_t *drive)
2931 idetape_tape_t *tape = drive->driver_data;
2935 #if IDETAPE_DEBUG_LOG
2936 if (tape->debug_level >= 4)
2937 printk(KERN_INFO "ide-tape: Reached idetape_read_position\n");
2938 #endif /* IDETAPE_DEBUG_LOG */
2940 idetape_create_read_position_cmd(&pc);
2941 if (idetape_queue_pc_tail(drive, &pc))
2943 position = tape->first_frame_position;
2947 static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
2949 idetape_init_pc(pc);
2950 pc->c[0] = IDETAPE_LOCATE_CMD;
2952 put_unaligned(htonl(block), (unsigned int *) &pc->c[3]);
2953 pc->c[8] = partition;
2954 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
2955 pc->callback = &idetape_pc_callback;
2958 static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
2960 idetape_tape_t *tape = drive->driver_data;
2962 if (!tape->capabilities.lock)
2965 idetape_init_pc(pc);
2966 pc->c[0] = IDETAPE_PREVENT_CMD;
2968 pc->callback = &idetape_pc_callback;
2972 static int __idetape_discard_read_pipeline (ide_drive_t *drive)
2974 idetape_tape_t *tape = drive->driver_data;
2975 unsigned long flags;
2978 if (tape->chrdev_direction != idetape_direction_read)
2981 /* Remove merge stage. */
2982 cnt = tape->merge_stage_size / tape->tape_block_size;
2983 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
2984 ++cnt; /* Filemarks count as 1 sector */
2985 tape->merge_stage_size = 0;
2986 if (tape->merge_stage != NULL) {
2987 __idetape_kfree_stage(tape->merge_stage);
2988 tape->merge_stage = NULL;
2991 /* Clear pipeline flags. */
2992 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
2993 tape->chrdev_direction = idetape_direction_none;
2995 /* Remove pipeline stages. */
2996 if (tape->first_stage == NULL)
2999 spin_lock_irqsave(&tape->spinlock, flags);
3000 tape->next_stage = NULL;
3001 if (idetape_pipeline_active(tape))
3002 idetape_wait_for_request(drive, tape->active_data_request);
3003 spin_unlock_irqrestore(&tape->spinlock, flags);
3005 while (tape->first_stage != NULL) {
3006 struct request *rq_ptr = &tape->first_stage->rq;
3008 cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
3009 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3011 idetape_remove_stage_head(drive);
3013 tape->nr_pending_stages = 0;
3014 tape->max_stages = tape->min_pipeline;
3019 * idetape_position_tape positions the tape to the requested block
3020 * using the LOCATE packet command. A READ POSITION command is then
3021 * issued to check where we are positioned.
3023 * Like all higher level operations, we queue the commands at the tail
3024 * of the request queue and wait for their completion.
3027 static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
3029 idetape_tape_t *tape = drive->driver_data;
3033 if (tape->chrdev_direction == idetape_direction_read)
3034 __idetape_discard_read_pipeline(drive);
3035 idetape_wait_ready(drive, 60 * 5 * HZ);
3036 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
3037 retval = idetape_queue_pc_tail(drive, &pc);
3041 idetape_create_read_position_cmd(&pc);
3042 return (idetape_queue_pc_tail(drive, &pc));
3045 static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
3047 idetape_tape_t *tape = drive->driver_data;
3051 cnt = __idetape_discard_read_pipeline(drive);
3052 if (restore_position) {
3053 position = idetape_read_position(drive);
3054 seek = position > cnt ? position - cnt : 0;
3055 if (idetape_position_tape(drive, seek, 0, 0)) {
3056 printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
3063 * idetape_queue_rw_tail generates a read/write request for the block
3064 * device interface and wait for it to be serviced.
3066 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
3068 idetape_tape_t *tape = drive->driver_data;
3071 #if IDETAPE_DEBUG_LOG
3072 if (tape->debug_level >= 2)
3073 printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd);
3074 #endif /* IDETAPE_DEBUG_LOG */
3075 #if IDETAPE_DEBUG_BUGS
3076 if (idetape_pipeline_active(tape)) {
3077 printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
3080 #endif /* IDETAPE_DEBUG_BUGS */
3082 idetape_init_rq(&rq, cmd);
3083 rq.rq_disk = tape->disk;
3084 rq.special = (void *)bh;
3085 rq.sector = tape->first_frame_position;
3086 rq.nr_sectors = rq.current_nr_sectors = blocks;
3087 (void) ide_do_drive_cmd(drive, &rq, ide_wait);
3089 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
3092 if (tape->merge_stage)
3093 idetape_init_merge_stage(tape);
3094 if (rq.errors == IDETAPE_ERROR_GENERAL)
3096 return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
3100 * idetape_insert_pipeline_into_queue is used to start servicing the
3101 * pipeline stages, starting from tape->next_stage.
3103 static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
3105 idetape_tape_t *tape = drive->driver_data;
3107 if (tape->next_stage == NULL)
3109 if (!idetape_pipeline_active(tape)) {
3110 set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
3111 idetape_active_next_stage(drive);
3112 (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
3116 static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
3118 idetape_init_pc(pc);
3119 pc->c[0] = IDETAPE_INQUIRY_CMD;
3120 pc->c[4] = pc->request_transfer = 254;
3121 pc->callback = &idetape_pc_callback;
3124 static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
3126 idetape_init_pc(pc);
3127 pc->c[0] = IDETAPE_REWIND_CMD;
3128 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3129 pc->callback = &idetape_pc_callback;
3133 static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length)
3135 idetape_init_pc(pc);
3136 set_bit(PC_WRITING, &pc->flags);
3137 pc->c[0] = IDETAPE_MODE_SELECT_CMD;
3139 put_unaligned(htons(length), (unsigned short *) &pc->c[3]);
3140 pc->request_transfer = 255;
3141 pc->callback = &idetape_pc_callback;
3145 static void idetape_create_erase_cmd (idetape_pc_t *pc)
3147 idetape_init_pc(pc);
3148 pc->c[0] = IDETAPE_ERASE_CMD;
3150 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3151 pc->callback = &idetape_pc_callback;
3154 static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
3156 idetape_init_pc(pc);
3157 pc->c[0] = IDETAPE_SPACE_CMD;
3158 put_unaligned(htonl(count), (unsigned int *) &pc->c[1]);
3160 set_bit(PC_WAIT_FOR_DSC, &pc->flags);
3161 pc->callback = &idetape_pc_callback;
3164 static void idetape_wait_first_stage (ide_drive_t *drive)
3166 idetape_tape_t *tape = drive->driver_data;
3167 unsigned long flags;
3169 if (tape->first_stage == NULL)
3171 spin_lock_irqsave(&tape->spinlock, flags);
3172 if (tape->active_stage == tape->first_stage)
3173 idetape_wait_for_request(drive, tape->active_data_request);
3174 spin_unlock_irqrestore(&tape->spinlock, flags);
3178 * idetape_add_chrdev_write_request tries to add a character device
3179 * originated write request to our pipeline. In case we don't succeed,
3180 * we revert to non-pipelined operation mode for this request.
3182 * 1. Try to allocate a new pipeline stage.
3183 * 2. If we can't, wait for more and more requests to be serviced
3184 * and try again each time.
3185 * 3. If we still can't allocate a stage, fallback to
3186 * non-pipelined operation mode for this request.
3188 static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
3190 idetape_tape_t *tape = drive->driver_data;
3191 idetape_stage_t *new_stage;
3192 unsigned long flags;
3195 #if IDETAPE_DEBUG_LOG
3196 if (tape->debug_level >= 3)
3197 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n");
3198 #endif /* IDETAPE_DEBUG_LOG */
3201 * Attempt to allocate a new stage.
3202 * Pay special attention to possible race conditions.
3204 while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
3205 spin_lock_irqsave(&tape->spinlock, flags);
3206 if (idetape_pipeline_active(tape)) {
3207 idetape_wait_for_request(drive, tape->active_data_request);
3208 spin_unlock_irqrestore(&tape->spinlock, flags);
3210 spin_unlock_irqrestore(&tape->spinlock, flags);
3211 idetape_insert_pipeline_into_queue(drive);
3212 if (idetape_pipeline_active(tape))
3215 * Linux is short on memory. Fallback to
3216 * non-pipelined operation mode for this request.
3218 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3221 rq = &new_stage->rq;
3222 idetape_init_rq(rq, REQ_IDETAPE_WRITE);
3223 /* Doesn't actually matter - We always assume sequential access */
3224 rq->sector = tape->first_frame_position;
3225 rq->nr_sectors = rq->current_nr_sectors = blocks;
3227 idetape_switch_buffers(tape, new_stage);
3228 idetape_add_stage_tail(drive, new_stage);
3229 tape->pipeline_head++;
3230 calculate_speeds(drive);
3233 * Estimate whether the tape has stopped writing by checking
3234 * if our write pipeline is currently empty. If we are not
3235 * writing anymore, wait for the pipeline to be full enough
3236 * (90%) before starting to service requests, so that we will
3237 * be able to keep up with the higher speeds of the tape.
3239 if (!idetape_pipeline_active(tape)) {
3240 if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
3241 tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
3242 tape->measure_insert_time = 1;
3243 tape->insert_time = jiffies;
3244 tape->insert_size = 0;
3245 tape->insert_speed = 0;
3246 idetape_insert_pipeline_into_queue(drive);
3249 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3250 /* Return a deferred error */
3256 * idetape_wait_for_pipeline will wait until all pending pipeline
3257 * requests are serviced. Typically called on device close.
3259 static void idetape_wait_for_pipeline (ide_drive_t *drive)
3261 idetape_tape_t *tape = drive->driver_data;
3262 unsigned long flags;
3264 while (tape->next_stage || idetape_pipeline_active(tape)) {
3265 idetape_insert_pipeline_into_queue(drive);
3266 spin_lock_irqsave(&tape->spinlock, flags);
3267 if (idetape_pipeline_active(tape))
3268 idetape_wait_for_request(drive, tape->active_data_request);
3269 spin_unlock_irqrestore(&tape->spinlock, flags);
3273 static void idetape_empty_write_pipeline (ide_drive_t *drive)
3275 idetape_tape_t *tape = drive->driver_data;
3277 struct idetape_bh *bh;
3279 #if IDETAPE_DEBUG_BUGS
3280 if (tape->chrdev_direction != idetape_direction_write) {
3281 printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
3284 if (tape->merge_stage_size > tape->stage_size) {
3285 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
3286 tape->merge_stage_size = tape->stage_size;
3288 #endif /* IDETAPE_DEBUG_BUGS */
3289 if (tape->merge_stage_size) {
3290 blocks = tape->merge_stage_size / tape->tape_block_size;
3291 if (tape->merge_stage_size % tape->tape_block_size) {
3295 i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
3296 bh = tape->bh->b_reqnext;
3298 atomic_set(&bh->b_count, 0);
3305 printk(KERN_INFO "ide-tape: bug, bh NULL\n");
3308 min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
3309 memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
3310 atomic_add(min, &bh->b_count);
3315 (void) idetape_add_chrdev_write_request(drive, blocks);
3316 tape->merge_stage_size = 0;
3318 idetape_wait_for_pipeline(drive);
3319 if (tape->merge_stage != NULL) {
3320 __idetape_kfree_stage(tape->merge_stage);
3321 tape->merge_stage = NULL;
3323 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
3324 tape->chrdev_direction = idetape_direction_none;
3327 * On the next backup, perform the feedback loop again.
3328 * (I don't want to keep sense information between backups,
3329 * as some systems are constantly on, and the system load
3330 * can be totally different on the next backup).
3332 tape->max_stages = tape->min_pipeline;
3333 #if IDETAPE_DEBUG_BUGS
3334 if (tape->first_stage != NULL ||
3335 tape->next_stage != NULL ||
3336 tape->last_stage != NULL ||
3337 tape->nr_stages != 0) {
3338 printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
3339 "first_stage %p, next_stage %p, "
3340 "last_stage %p, nr_stages %d\n",
3341 tape->first_stage, tape->next_stage,
3342 tape->last_stage, tape->nr_stages);
3344 #endif /* IDETAPE_DEBUG_BUGS */
3347 static void idetape_restart_speed_control (ide_drive_t *drive)
3349 idetape_tape_t *tape = drive->driver_data;
3351 tape->restart_speed_control_req = 0;
3352 tape->pipeline_head = 0;
3353 tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
3354 tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
3355 tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
3356 tape->uncontrolled_pipeline_head_speed = 0;
3357 tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
3358 tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
3361 static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
3363 idetape_tape_t *tape = drive->driver_data;
3364 idetape_stage_t *new_stage;
3367 int blocks = tape->capabilities.ctl;
3369 /* Initialize read operation */
3370 if (tape->chrdev_direction != idetape_direction_read) {
3371 if (tape->chrdev_direction == idetape_direction_write) {
3372 idetape_empty_write_pipeline(drive);
3373 idetape_flush_tape_buffers(drive);
3375 #if IDETAPE_DEBUG_BUGS
3376 if (tape->merge_stage || tape->merge_stage_size) {
3377 printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
3378 tape->merge_stage_size = 0;
3380 #endif /* IDETAPE_DEBUG_BUGS */
3381 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3383 tape->chrdev_direction = idetape_direction_read;
3386 * Issue a read 0 command to ensure that DSC handshake
3387 * is switched from completion mode to buffer available
3389 * No point in issuing this if DSC overlap isn't supported,
3390 * some drives (Seagate STT3401A) will return an error.
3392 if (drive->dsc_overlap) {
3393 bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
3394 if (bytes_read < 0) {
3395 __idetape_kfree_stage(tape->merge_stage);
3396 tape->merge_stage = NULL;
3397 tape->chrdev_direction = idetape_direction_none;
3402 if (tape->restart_speed_control_req)
3403 idetape_restart_speed_control(drive);
3404 idetape_init_rq(&rq, REQ_IDETAPE_READ);
3405 rq.sector = tape->first_frame_position;
3406 rq.nr_sectors = rq.current_nr_sectors = blocks;
3407 if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
3408 tape->nr_stages < max_stages) {
3409 new_stage = idetape_kmalloc_stage(tape);
3410 while (new_stage != NULL) {
3412 idetape_add_stage_tail(drive, new_stage);
3413 if (tape->nr_stages >= max_stages)
3415 new_stage = idetape_kmalloc_stage(tape);
3418 if (!idetape_pipeline_active(tape)) {
3419 if (tape->nr_pending_stages >= 3 * max_stages / 4) {
3420 tape->measure_insert_time = 1;
3421 tape->insert_time = jiffies;
3422 tape->insert_size = 0;
3423 tape->insert_speed = 0;
3424 idetape_insert_pipeline_into_queue(drive);
3431 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
3432 * to service a character device read request and add read-ahead
3433 * requests to our pipeline.
3435 static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
3437 idetape_tape_t *tape = drive->driver_data;
3438 unsigned long flags;
3439 struct request *rq_ptr;
3442 #if IDETAPE_DEBUG_LOG
3443 if (tape->debug_level >= 4)
3444 printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks);
3445 #endif /* IDETAPE_DEBUG_LOG */
3448 * If we are at a filemark, return a read length of 0
3450 if (test_bit(IDETAPE_FILEMARK, &tape->flags))
3454 * Wait for the next block to be available at the head
3457 idetape_initiate_read(drive, tape->max_stages);
3458 if (tape->first_stage == NULL) {
3459 if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
3461 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
3463 idetape_wait_first_stage(drive);
3464 rq_ptr = &tape->first_stage->rq;
3465 bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
3466 rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
3469 if (rq_ptr->errors == IDETAPE_ERROR_EOD)
3472 idetape_switch_buffers(tape, tape->first_stage);
3473 if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
3474 set_bit(IDETAPE_FILEMARK, &tape->flags);
3475 spin_lock_irqsave(&tape->spinlock, flags);
3476 idetape_remove_stage_head(drive);
3477 spin_unlock_irqrestore(&tape->spinlock, flags);
3478 tape->pipeline_head++;
3479 calculate_speeds(drive);
3481 #if IDETAPE_DEBUG_BUGS
3482 if (bytes_read > blocks * tape->tape_block_size) {
3483 printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
3484 bytes_read = blocks * tape->tape_block_size;
3486 #endif /* IDETAPE_DEBUG_BUGS */
3487 return (bytes_read);
3490 static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
3492 idetape_tape_t *tape = drive->driver_data;
3493 struct idetape_bh *bh;
3499 bh = tape->merge_stage->bh;
3500 count = min(tape->stage_size, bcount);
3502 blocks = count / tape->tape_block_size;
3504 atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
3505 memset(bh->b_data, 0, atomic_read(&bh->b_count));
3506 count -= atomic_read(&bh->b_count);
3509 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
3513 static int idetape_pipeline_size (ide_drive_t *drive)
3515 idetape_tape_t *tape = drive->driver_data;
3516 idetape_stage_t *stage;
3520 idetape_wait_for_pipeline(drive);
3521 stage = tape->first_stage;
3522 while (stage != NULL) {
3524 size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
3525 if (rq->errors == IDETAPE_ERROR_FILEMARK)
3526 size += tape->tape_block_size;
3527 stage = stage->next;
3529 size += tape->merge_stage_size;
3534 * Rewinds the tape to the Beginning Of the current Partition (BOP).
3536 * We currently support only one partition.
3538 static int idetape_rewind_tape (ide_drive_t *drive)
3542 #if IDETAPE_DEBUG_LOG
3543 idetape_tape_t *tape = drive->driver_data;
3544 if (tape->debug_level >= 2)
3545 printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n");
3546 #endif /* IDETAPE_DEBUG_LOG */
3548 idetape_create_rewind_cmd(drive, &pc);
3549 retval = idetape_queue_pc_tail(drive, &pc);
3553 idetape_create_read_position_cmd(&pc);
3554 retval = idetape_queue_pc_tail(drive, &pc);
3561 * Our special ide-tape ioctl's.
3563 * Currently there aren't any ioctl's.
3564 * mtio.h compatible commands should be issued to the character device
3567 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
3569 idetape_tape_t *tape = drive->driver_data;
3570 idetape_config_t config;
3571 void __user *argp = (void __user *)arg;
3573 #if IDETAPE_DEBUG_LOG
3574 if (tape->debug_level >= 4)
3575 printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n");
3576 #endif /* IDETAPE_DEBUG_LOG */
3579 if (copy_from_user(&config, argp, sizeof (idetape_config_t)))
3581 tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
3582 tape->max_stages = config.nr_stages;
3585 config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
3586 config.nr_stages = tape->max_stages;
3587 if (copy_to_user(argp, &config, sizeof (idetape_config_t)))
3597 * idetape_space_over_filemarks is now a bit more complicated than just
3598 * passing the command to the tape since we may have crossed some
3599 * filemarks during our pipelined read-ahead mode.
3601 * As a minor side effect, the pipeline enables us to support MTFSFM when
3602 * the filemark is in our internal pipeline even if the tape doesn't
3603 * support spacing over filemarks in the reverse direction.
3605 static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
3607 idetape_tape_t *tape = drive->driver_data;
3609 unsigned long flags;
3614 if (MTBSF == mt_op || MTBSFM == mt_op) {
3615 if (!tape->capabilities.sprev)
3617 mt_count = - mt_count;
3620 if (tape->chrdev_direction == idetape_direction_read) {
3622 * We have a read-ahead buffer. Scan it for crossed
3625 tape->merge_stage_size = 0;
3626 if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
3628 while (tape->first_stage != NULL) {
3629 if (count == mt_count) {
3630 if (mt_op == MTFSFM)
3631 set_bit(IDETAPE_FILEMARK, &tape->flags);
3634 spin_lock_irqsave(&tape->spinlock, flags);
3635 if (tape->first_stage == tape->active_stage) {
3637 * We have reached the active stage in the read pipeline.
3638 * There is no point in allowing the drive to continue
3639 * reading any farther, so we stop the pipeline.
3641 * This section should be moved to a separate subroutine,
3642 * because a similar function is performed in
3643 * __idetape_discard_read_pipeline(), for example.
3645 tape->next_stage = NULL;
3646 spin_unlock_irqrestore(&tape->spinlock, flags);
3647 idetape_wait_first_stage(drive);
3648 tape->next_stage = tape->first_stage->next;
3650 spin_unlock_irqrestore(&tape->spinlock, flags);
3651 if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
3653 idetape_remove_stage_head(drive);
3655 idetape_discard_read_pipeline(drive, 0);
3659 * The filemark was not found in our internal pipeline.
3660 * Now we can issue the space command.
3665 idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
3666 return (idetape_queue_pc_tail(drive, &pc));
3669 if (!tape->capabilities.sprev)
3671 retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
3672 if (retval) return (retval);
3673 count = (MTBSFM == mt_op ? 1 : -1);
3674 return (idetape_space_over_filemarks(drive, MTFSF, count));
3676 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
3683 * Our character device read / write functions.
3685 * The tape is optimized to maximize throughput when it is transferring
3686 * an integral number of the "continuous transfer limit", which is
3687 * a parameter of the specific tape (26 KB on my particular tape).
3688 * (32 kB for Onstream)
3690 * As of version 1.3 of the driver, the character device provides an
3691 * abstract continuous view of the media - any mix of block sizes (even 1
3692 * byte) on the same backup/restore procedure is supported. The driver
3693 * will internally convert the requests to the recommended transfer unit,
3694 * so that an unmatch between the user's block size to the recommended
3695 * size will only result in a (slightly) increased driver overhead, but
3696 * will no longer hit performance.
3697 * This is not applicable to Onstream.
3699 static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
3700 size_t count, loff_t *ppos)
3702 struct ide_tape_obj *tape = ide_tape_f(file);
3703 ide_drive_t *drive = tape->drive;
3704 ssize_t bytes_read,temp, actually_read = 0, rc;
3707 #if IDETAPE_DEBUG_LOG
3708 if (tape->debug_level >= 3)
3709 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count);
3710 #endif /* IDETAPE_DEBUG_LOG */
3712 if (tape->chrdev_direction != idetape_direction_read) {
3713 if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
3714 if (count > tape->tape_block_size &&
3715 (count % tape->tape_block_size) == 0)
3716 tape->user_bs_factor = count / tape->tape_block_size;
3718 if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
3722 if (tape->merge_stage_size) {
3723 actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
3724 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
3726 buf += actually_read;
3727 tape->merge_stage_size -= actually_read;
3728 count -= actually_read;
3730 while (count >= tape->stage_size) {
3731 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3732 if (bytes_read <= 0)
3734 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
3737 count -= bytes_read;
3738 actually_read += bytes_read;
3741 bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
3742 if (bytes_read <= 0)
3744 temp = min((unsigned long)count, (unsigned long)bytes_read);
3745 if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
3747 actually_read += temp;
3748 tape->merge_stage_size = bytes_read-temp;
3751 if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
3752 #if IDETAPE_DEBUG_LOG
3753 if (tape->debug_level >= 2)
3754 printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name);
3756 idetape_space_over_filemarks(drive, MTFSF, 1);
3760 return (ret) ? ret : actually_read;
3763 static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
3764 size_t count, loff_t *ppos)
3766 struct ide_tape_obj *tape = ide_tape_f(file);
3767 ide_drive_t *drive = tape->drive;
3768 ssize_t actually_written = 0;
3771 /* The drive is write protected. */
3772 if (tape->write_prot)
3775 #if IDETAPE_DEBUG_LOG
3776 if (tape->debug_level >= 3)
3777 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, "
3778 "count %Zd\n", count);
3779 #endif /* IDETAPE_DEBUG_LOG */
3781 /* Initialize write operation */
3782 if (tape->chrdev_direction != idetape_direction_write) {
3783 if (tape->chrdev_direction == idetape_direction_read)
3784 idetape_discard_read_pipeline(drive, 1);
3785 #if IDETAPE_DEBUG_BUGS
3786 if (tape->merge_stage || tape->merge_stage_size) {
3787 printk(KERN_ERR "ide-tape: merge_stage_size "
3788 "should be 0 now\n");
3789 tape->merge_stage_size = 0;
3791 #endif /* IDETAPE_DEBUG_BUGS */
3792 if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
3794 tape->chrdev_direction = idetape_direction_write;
3795 idetape_init_merge_stage(tape);
3798 * Issue a write 0 command to ensure that DSC handshake
3799 * is switched from completion mode to buffer available
3801 * No point in issuing this if DSC overlap isn't supported,
3802 * some drives (Seagate STT3401A) will return an error.
3804 if (drive->dsc_overlap) {
3805 ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
3807 __idetape_kfree_stage(tape->merge_stage);
3808 tape->merge_stage = NULL;
3809 tape->chrdev_direction = idetape_direction_none;
3816 if (tape->restart_speed_control_req)
3817 idetape_restart_speed_control(drive);
3818 if (tape->merge_stage_size) {
3819 #if IDETAPE_DEBUG_BUGS
3820 if (tape->merge_stage_size >= tape->stage_size) {
3821 printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
3822 tape->merge_stage_size = 0;
3824 #endif /* IDETAPE_DEBUG_BUGS */
3825 actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
3826 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
3828 buf += actually_written;
3829 tape->merge_stage_size += actually_written;
3830 count -= actually_written;
3832 if (tape->merge_stage_size == tape->stage_size) {
3834 tape->merge_stage_size = 0;
3835 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3840 while (count >= tape->stage_size) {
3842 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
3844 buf += tape->stage_size;
3845 count -= tape->stage_size;
3846 retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
3847 actually_written += tape->stage_size;
3852 actually_written += count;
3853 if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
3855 tape->merge_stage_size += count;
3857 return (ret) ? ret : actually_written;
3860 static int idetape_write_filemark (ide_drive_t *drive)
3864 /* Write a filemark */
3865 idetape_create_write_filemark_cmd(drive, &pc, 1);
3866 if (idetape_queue_pc_tail(drive, &pc)) {
3867 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
3874 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3875 * the general mtio MTIOCTOP ioctl is requested.
3877 * We currently support the following mtio.h operations:
3879 * MTFSF - Space over mt_count filemarks in the positive direction.
3880 * The tape is positioned after the last spaced filemark.
3882 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3885 * MTBSF - Steps background over mt_count filemarks, tape is
3886 * positioned before the last filemark.
3888 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3892 * MTBSF and MTBSFM are not supported when the tape doesn't
3893 * support spacing over filemarks in the reverse direction.
3894 * In this case, MTFSFM is also usually not supported (it is
3895 * supported in the rare case in which we crossed the filemark
3896 * during our read-ahead pipelined operation mode).
3898 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3899 * the last written filemark.
3901 * MTREW - Rewinds tape.
3903 * MTLOAD - Loads the tape.
3905 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3906 * MTUNLOAD prevents further access until the media is replaced.
3908 * MTNOP - Flushes tape buffers.
3910 * MTRETEN - Retension media. This typically consists of one end
3911 * to end pass on the media.
3913 * MTEOM - Moves to the end of recorded data.
3915 * MTERASE - Erases tape.
3917 * MTSETBLK - Sets the user block size to mt_count bytes. If
3918 * mt_count is 0, we will attempt to autodetect
3921 * MTSEEK - Positions the tape in a specific block number, where
3922 * each block is assumed to contain which user_block_size
3925 * MTSETPART - Switches to another tape partition.
3927 * MTLOCK - Locks the tape door.
3929 * MTUNLOCK - Unlocks the tape door.
3931 * The following commands are currently not supported:
3933 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3934 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3936 static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count)
3938 idetape_tape_t *tape = drive->driver_data;
3942 #if IDETAPE_DEBUG_LOG
3943 if (tape->debug_level >= 1)
3944 printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: "
3945 "mt_op=%d, mt_count=%d\n", mt_op, mt_count);
3946 #endif /* IDETAPE_DEBUG_LOG */
3948 * Commands which need our pipelined read-ahead stages.
3957 return (idetape_space_over_filemarks(drive,mt_op,mt_count));
3963 if (tape->write_prot)
3965 idetape_discard_read_pipeline(drive, 1);
3966 for (i = 0; i < mt_count; i++) {
3967 retval = idetape_write_filemark(drive);
3973 idetape_discard_read_pipeline(drive, 0);
3974 if (idetape_rewind_tape(drive))
3978 idetape_discard_read_pipeline(drive, 0);
3979 idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
3980 return (idetape_queue_pc_tail(drive, &pc));
3984 * If door is locked, attempt to unlock before
3985 * attempting to eject.
3987 if (tape->door_locked) {
3988 if (idetape_create_prevent_cmd(drive, &pc, 0))
3989 if (!idetape_queue_pc_tail(drive, &pc))
3990 tape->door_locked = DOOR_UNLOCKED;
3992 idetape_discard_read_pipeline(drive, 0);
3993 idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
3994 retval = idetape_queue_pc_tail(drive, &pc);
3996 clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
3999 idetape_discard_read_pipeline(drive, 0);
4000 return (idetape_flush_tape_buffers(drive));
4002 idetape_discard_read_pipeline(drive, 0);
4003 idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
4004 return (idetape_queue_pc_tail(drive, &pc));
4006 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
4007 return (idetape_queue_pc_tail(drive, &pc));
4009 (void) idetape_rewind_tape(drive);
4010 idetape_create_erase_cmd(&pc);
4011 return (idetape_queue_pc_tail(drive, &pc));
4014 if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
4016 tape->user_bs_factor = mt_count / tape->tape_block_size;
4017 clear_bit(IDETAPE_DETECT_BS, &tape->flags);
4019 set_bit(IDETAPE_DETECT_BS, &tape->flags);
4022 idetape_discard_read_pipeline(drive, 0);
4023 return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
4025 idetape_discard_read_pipeline(drive, 0);
4026 return (idetape_position_tape(drive, 0, mt_count, 0));
4030 if (!idetape_create_prevent_cmd(drive, &pc, 1))
4032 retval = idetape_queue_pc_tail(drive, &pc);
4033 if (retval) return retval;
4034 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
4037 if (!idetape_create_prevent_cmd(drive, &pc, 0))
4039 retval = idetape_queue_pc_tail(drive, &pc);
4040 if (retval) return retval;
4041 tape->door_locked = DOOR_UNLOCKED;
4044 printk(KERN_ERR "ide-tape: MTIO operation %d not "
4045 "supported\n", mt_op);
4051 * Our character device ioctls.
4053 * General mtio.h magnetic io commands are supported here, and not in
4054 * the corresponding block interface.
4056 * The following ioctls are supported:
4058 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
4060 * MTIOCGET - The mt_dsreg field in the returned mtget structure
4061 * will be set to (user block size in bytes <<
4062 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
4064 * The mt_blkno is set to the current user block number.
4065 * The other mtget fields are not supported.
4067 * MTIOCPOS - The current tape "block position" is returned. We
4068 * assume that each block contains user_block_size
4071 * Our own ide-tape ioctls are supported on both interfaces.
4073 static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
4075 struct ide_tape_obj *tape = ide_tape_f(file);
4076 ide_drive_t *drive = tape->drive;
4080 int block_offset = 0, position = tape->first_frame_position;
4081 void __user *argp = (void __user *)arg;
4083 #if IDETAPE_DEBUG_LOG
4084 if (tape->debug_level >= 3)
4085 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, "
4087 #endif /* IDETAPE_DEBUG_LOG */
4089 tape->restart_speed_control_req = 1;
4090 if (tape->chrdev_direction == idetape_direction_write) {
4091 idetape_empty_write_pipeline(drive);
4092 idetape_flush_tape_buffers(drive);
4094 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
4095 block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
4096 if ((position = idetape_read_position(drive)) < 0)
4101 if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
4103 return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
4105 memset(&mtget, 0, sizeof (struct mtget));
4106 mtget.mt_type = MT_ISSCSI2;
4107 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
4108 mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
4109 if (tape->drv_write_prot) {
4110 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
4112 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
4116 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
4117 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
4121 if (tape->chrdev_direction == idetape_direction_read)
4122 idetape_discard_read_pipeline(drive, 1);
4123 return idetape_blkdev_ioctl(drive, cmd, arg);
4127 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive);
4130 * Our character device open function.
4132 static int idetape_chrdev_open (struct inode *inode, struct file *filp)
4134 unsigned int minor = iminor(inode), i = minor & ~0xc0;
4136 idetape_tape_t *tape;
4141 * We really want to do nonseekable_open(inode, filp); here, but some
4142 * versions of tar incorrectly call lseek on tapes and bail out if that
4143 * fails. So we disallow pread() and pwrite(), but permit lseeks.
4145 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
4147 #if IDETAPE_DEBUG_LOG
4148 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n");
4149 #endif /* IDETAPE_DEBUG_LOG */
4151 if (i >= MAX_HWIFS * MAX_DRIVES)
4154 if (!(tape = ide_tape_chrdev_get(i)))
4157 drive = tape->drive;
4159 filp->private_data = tape;
4161 if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
4166 retval = idetape_wait_ready(drive, 60 * HZ);
4168 clear_bit(IDETAPE_BUSY, &tape->flags);
4169 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
4173 idetape_read_position(drive);
4174 if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
4175 (void)idetape_rewind_tape(drive);
4177 if (tape->chrdev_direction != idetape_direction_read)
4178 clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
4180 /* Read block size and write protect status from drive. */
4181 idetape_get_blocksize_from_block_descriptor(drive);
4183 /* Set write protect flag if device is opened as read-only. */
4184 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
4185 tape->write_prot = 1;
4187 tape->write_prot = tape->drv_write_prot;
4189 /* Make sure drive isn't write protected if user wants to write. */
4190 if (tape->write_prot) {
4191 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
4192 (filp->f_flags & O_ACCMODE) == O_RDWR) {
4193 clear_bit(IDETAPE_BUSY, &tape->flags);
4200 * Lock the tape drive door so user can't eject.
4202 if (tape->chrdev_direction == idetape_direction_none) {
4203 if (idetape_create_prevent_cmd(drive, &pc, 1)) {
4204 if (!idetape_queue_pc_tail(drive, &pc)) {
4205 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
4206 tape->door_locked = DOOR_LOCKED;
4210 idetape_restart_speed_control(drive);
4211 tape->restart_speed_control_req = 0;
4219 static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
4221 idetape_tape_t *tape = drive->driver_data;
4223 idetape_empty_write_pipeline(drive);
4224 tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
4225 if (tape->merge_stage != NULL) {
4226 idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
4227 __idetape_kfree_stage(tape->merge_stage);
4228 tape->merge_stage = NULL;
4230 idetape_write_filemark(drive);
4231 idetape_flush_tape_buffers(drive);
4232 idetape_flush_tape_buffers(drive);
4236 * Our character device release function.
4238 static int idetape_chrdev_release (struct inode *inode, struct file *filp)
4240 struct ide_tape_obj *tape = ide_tape_f(filp);
4241 ide_drive_t *drive = tape->drive;
4243 unsigned int minor = iminor(inode);
4246 tape = drive->driver_data;
4247 #if IDETAPE_DEBUG_LOG
4248 if (tape->debug_level >= 3)
4249 printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n");
4250 #endif /* IDETAPE_DEBUG_LOG */
4252 if (tape->chrdev_direction == idetape_direction_write)
4253 idetape_write_release(drive, minor);
4254 if (tape->chrdev_direction == idetape_direction_read) {
4256 idetape_discard_read_pipeline(drive, 1);
4258 idetape_wait_for_pipeline(drive);
4260 if (tape->cache_stage != NULL) {
4261 __idetape_kfree_stage(tape->cache_stage);
4262 tape->cache_stage = NULL;
4264 if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
4265 (void) idetape_rewind_tape(drive);
4266 if (tape->chrdev_direction == idetape_direction_none) {
4267 if (tape->door_locked == DOOR_LOCKED) {
4268 if (idetape_create_prevent_cmd(drive, &pc, 0)) {
4269 if (!idetape_queue_pc_tail(drive, &pc))
4270 tape->door_locked = DOOR_UNLOCKED;
4274 clear_bit(IDETAPE_BUSY, &tape->flags);
4281 * idetape_identify_device is called to check the contents of the
4282 * ATAPI IDENTIFY command results. We return:
4284 * 1 If the tape can be supported by us, based on the information
4287 * 0 If this tape driver is not currently supported by us.
4289 static int idetape_identify_device (ide_drive_t *drive)
4291 struct idetape_id_gcw gcw;
4292 struct hd_driveid *id = drive->id;
4294 if (drive->id_read == 0)
4297 *((unsigned short *) &gcw) = id->config;
4299 #if IDETAPE_DEBUG_INFO
4300 printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n");
4301 printk(KERN_INFO "ide-tape: Protocol Type: ");
4302 switch (gcw.protocol) {
4303 case 0: case 1: printk("ATA\n");break;
4304 case 2: printk("ATAPI\n");break;
4305 case 3: printk("Reserved (Unknown to ide-tape)\n");break;
4307 printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type);
4308 switch (gcw.device_type) {
4309 case 0: printk("Direct-access Device\n");break;
4310 case 1: printk("Streaming Tape Device\n");break;
4311 case 2: case 3: case 4: printk("Reserved\n");break;
4312 case 5: printk("CD-ROM Device\n");break;
4313 case 6: printk("Reserved\n");
4314 case 7: printk("Optical memory Device\n");break;
4315 case 0x1f: printk("Unknown or no Device type\n");break;
4316 default: printk("Reserved\n");
4318 printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n");
4319 printk(KERN_INFO "ide-tape: Command Packet DRQ Type: ");
4320 switch (gcw.drq_type) {
4321 case 0: printk("Microprocessor DRQ\n");break;
4322 case 1: printk("Interrupt DRQ\n");break;
4323 case 2: printk("Accelerated DRQ\n");break;
4324 case 3: printk("Reserved\n");break;
4326 printk(KERN_INFO "ide-tape: Command Packet Size: ");
4327 switch (gcw.packet_size) {
4328 case 0: printk("12 bytes\n");break;
4329 case 1: printk("16 bytes\n");break;
4330 default: printk("Reserved\n");break;
4332 #endif /* IDETAPE_DEBUG_INFO */
4334 /* Check that we can support this device */
4336 if (gcw.protocol !=2 )
4337 printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n");
4338 else if (gcw.device_type != 1)
4339 printk(KERN_ERR "ide-tape: Device type is not set to tape\n");
4340 else if (!gcw.removable)
4341 printk(KERN_ERR "ide-tape: The removable flag is not set\n");
4342 else if (gcw.packet_size != 0) {
4343 printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n");
4344 if (gcw.packet_size == 1)
4345 printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n");
4352 * Use INQUIRY to get the firmware revision
4354 static void idetape_get_inquiry_results (ide_drive_t *drive)
4357 idetape_tape_t *tape = drive->driver_data;
4359 idetape_inquiry_result_t *inquiry;
4361 idetape_create_inquiry_cmd(&pc);
4362 if (idetape_queue_pc_tail(drive, &pc)) {
4363 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name);
4366 inquiry = (idetape_inquiry_result_t *) pc.buffer;
4367 memcpy(tape->vendor_id, inquiry->vendor_id, 8);
4368 memcpy(tape->product_id, inquiry->product_id, 16);
4369 memcpy(tape->firmware_revision, inquiry->revision_level, 4);
4370 ide_fixstring(tape->vendor_id, 10, 0);
4371 ide_fixstring(tape->product_id, 18, 0);
4372 ide_fixstring(tape->firmware_revision, 6, 0);
4373 r = tape->firmware_revision;
4374 if (*(r + 1) == '.')
4375 tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0';
4376 printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision);
4380 * idetape_get_mode_sense_results asks the tape about its various
4381 * parameters. In particular, we will adjust our data transfer buffer
4382 * size to the recommended value as returned by the tape.
4384 static void idetape_get_mode_sense_results (ide_drive_t *drive)
4386 idetape_tape_t *tape = drive->driver_data;
4388 idetape_mode_parameter_header_t *header;
4389 idetape_capabilities_page_t *capabilities;
4391 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
4392 if (idetape_queue_pc_tail(drive, &pc)) {
4393 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
4394 tape->tape_block_size = 512;
4395 tape->capabilities.ctl = 52;
4396 tape->capabilities.speed = 450;
4397 tape->capabilities.buffer_size = 6 * 52;
4400 header = (idetape_mode_parameter_header_t *) pc.buffer;
4401 capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl);
4403 capabilities->max_speed = ntohs(capabilities->max_speed);
4404 capabilities->ctl = ntohs(capabilities->ctl);
4405 capabilities->speed = ntohs(capabilities->speed);
4406 capabilities->buffer_size = ntohs(capabilities->buffer_size);
4408 if (!capabilities->speed) {
4409 printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
4410 capabilities->speed = 650;
4412 if (!capabilities->max_speed) {
4413 printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
4414 capabilities->max_speed = 650;
4417 tape->capabilities = *capabilities; /* Save us a copy */
4418 if (capabilities->blk512)
4419 tape->tape_block_size = 512;
4420 else if (capabilities->blk1024)
4421 tape->tape_block_size = 1024;
4423 #if IDETAPE_DEBUG_INFO
4424 printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n");
4425 printk(KERN_INFO "ide-tape: Mode Parameter Header:\n");
4426 printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length);
4427 printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type);
4428 printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp);
4429 printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl);
4431 printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n");
4432 printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code);
4433 printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length);
4434 printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No");
4435 printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No");
4436 printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No");
4437 printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No");
4438 printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No");
4439 printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No");
4440 printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No");
4441 printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No");
4442 printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No");
4443 printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No");
4444 printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No");
4445 printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No");
4446 printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No");
4447 printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed);
4448 printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl);
4449 printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed);
4450 printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512);
4451 #endif /* IDETAPE_DEBUG_INFO */
4455 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
4456 * and if it succeeds sets the tape block size with the reported value
4458 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive)
4461 idetape_tape_t *tape = drive->driver_data;
4463 idetape_mode_parameter_header_t *header;
4464 idetape_parameter_block_descriptor_t *block_descrp;
4466 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
4467 if (idetape_queue_pc_tail(drive, &pc)) {
4468 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
4469 if (tape->tape_block_size == 0) {
4470 printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n");
4471 tape->tape_block_size = 32768;
4475 header = (idetape_mode_parameter_header_t *) pc.buffer;
4476 block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t));
4477 tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2];
4478 tape->drv_write_prot = (header->dsp & 0x80) >> 7;
4480 #if IDETAPE_DEBUG_INFO
4481 printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size);
4482 #endif /* IDETAPE_DEBUG_INFO */
4485 #ifdef CONFIG_IDE_PROC_FS
4486 static void idetape_add_settings (ide_drive_t *drive)
4488 idetape_tape_t *tape = drive->driver_data;
4491 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
4493 ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
4494 ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
4495 ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
4496 ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
4497 ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
4498 ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
4499 ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL);
4500 ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
4501 ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
4502 ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
4503 ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
4504 ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
4505 ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
4506 ide_add_setting(drive, "debug_level", SETTING_RW, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL);
4509 static inline void idetape_add_settings(ide_drive_t *drive) { ; }
4513 * ide_setup is called to:
4515 * 1. Initialize our various state variables.
4516 * 2. Ask the tape for its capabilities.
4517 * 3. Allocate a buffer which will be used for data
4518 * transfer. The buffer size is chosen based on
4519 * the recommendation which we received in step (2).
4521 * Note that at this point ide.c already assigned us an irq, so that
4522 * we can queue requests here and wait for their completion.
4524 static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
4526 unsigned long t1, tmid, tn, t;
4528 struct idetape_id_gcw gcw;
4532 spin_lock_init(&tape->spinlock);
4533 drive->dsc_overlap = 1;
4534 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
4535 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
4537 drive->dsc_overlap = 0;
4539 /* Seagate Travan drives do not support DSC overlap. */
4540 if (strstr(drive->id->model, "Seagate STT3401"))
4541 drive->dsc_overlap = 0;
4542 tape->minor = minor;
4543 tape->name[0] = 'h';
4544 tape->name[1] = 't';
4545 tape->name[2] = '0' + minor;
4546 tape->chrdev_direction = idetape_direction_none;
4547 tape->pc = tape->pc_stack;
4548 tape->max_insert_speed = 10000;
4549 tape->speed_control = 1;
4550 *((unsigned short *) &gcw) = drive->id->config;
4551 if (gcw.drq_type == 1)
4552 set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
4554 tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
4556 idetape_get_inquiry_results(drive);
4557 idetape_get_mode_sense_results(drive);
4558 idetape_get_blocksize_from_block_descriptor(drive);
4559 tape->user_bs_factor = 1;
4560 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4561 while (tape->stage_size > 0xffff) {
4562 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
4563 tape->capabilities.ctl /= 2;
4564 tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
4566 stage_size = tape->stage_size;
4567 tape->pages_per_stage = stage_size / PAGE_SIZE;
4568 if (stage_size % PAGE_SIZE) {
4569 tape->pages_per_stage++;
4570 tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
4574 * Select the "best" DSC read/write polling frequency
4575 * and pipeline size.
4577 speed = max(tape->capabilities.speed, tape->capabilities.max_speed);
4579 tape->max_stages = speed * 1000 * 10 / tape->stage_size;
4582 * Limit memory use for pipeline to 10% of physical memory
4585 if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
4586 tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
4587 tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
4588 tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
4589 tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
4590 if (tape->max_stages == 0)
4591 tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
4593 t1 = (tape->stage_size * HZ) / (speed * 1000);
4594 tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
4595 tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
4597 if (tape->max_stages)
4603 * Ensure that the number we got makes sense; limit
4604 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
4606 tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
4607 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
4608 "%dkB pipeline, %lums tDSC%s\n",
4609 drive->name, tape->name, tape->capabilities.speed,
4610 (tape->capabilities.buffer_size * 512) / tape->stage_size,
4611 tape->stage_size / 1024,
4612 tape->max_stages * tape->stage_size / 1024,
4613 tape->best_dsc_rw_frequency * 1000 / HZ,
4614 drive->using_dma ? ", DMA":"");
4616 idetape_add_settings(drive);
4619 static void ide_tape_remove(ide_drive_t *drive)
4621 idetape_tape_t *tape = drive->driver_data;
4623 ide_proc_unregister_driver(drive, tape->driver);
4625 ide_unregister_region(tape->disk);
4630 static void ide_tape_release(struct kref *kref)
4632 struct ide_tape_obj *tape = to_ide_tape(kref);
4633 ide_drive_t *drive = tape->drive;
4634 struct gendisk *g = tape->disk;
4636 BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
4638 drive->dsc_overlap = 0;
4639 drive->driver_data = NULL;
4640 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
4641 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
4642 idetape_devs[tape->minor] = NULL;
4643 g->private_data = NULL;
4648 #ifdef CONFIG_IDE_PROC_FS
4649 static int proc_idetape_read_name
4650 (char *page, char **start, off_t off, int count, int *eof, void *data)
4652 ide_drive_t *drive = (ide_drive_t *) data;
4653 idetape_tape_t *tape = drive->driver_data;
4657 len = sprintf(out, "%s\n", tape->name);
4658 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
4661 static ide_proc_entry_t idetape_proc[] = {
4662 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
4663 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
4664 { NULL, 0, NULL, NULL }
4668 static int ide_tape_probe(ide_drive_t *);
4670 static ide_driver_t idetape_driver = {
4672 .owner = THIS_MODULE,
4674 .bus = &ide_bus_type,
4676 .probe = ide_tape_probe,
4677 .remove = ide_tape_remove,
4678 .version = IDETAPE_VERSION,
4680 .supports_dsc_overlap = 1,
4681 .do_request = idetape_do_request,
4682 .end_request = idetape_end_request,
4683 .error = __ide_error,
4684 .abort = __ide_abort,
4685 #ifdef CONFIG_IDE_PROC_FS
4686 .proc = idetape_proc,
4691 * Our character device supporting functions, passed to register_chrdev.
4693 static const struct file_operations idetape_fops = {
4694 .owner = THIS_MODULE,
4695 .read = idetape_chrdev_read,
4696 .write = idetape_chrdev_write,
4697 .ioctl = idetape_chrdev_ioctl,
4698 .open = idetape_chrdev_open,
4699 .release = idetape_chrdev_release,
4702 static int idetape_open(struct inode *inode, struct file *filp)
4704 struct gendisk *disk = inode->i_bdev->bd_disk;
4705 struct ide_tape_obj *tape;
4707 if (!(tape = ide_tape_get(disk)))
4713 static int idetape_release(struct inode *inode, struct file *filp)
4715 struct gendisk *disk = inode->i_bdev->bd_disk;
4716 struct ide_tape_obj *tape = ide_tape_g(disk);
4723 static int idetape_ioctl(struct inode *inode, struct file *file,
4724 unsigned int cmd, unsigned long arg)
4726 struct block_device *bdev = inode->i_bdev;
4727 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
4728 ide_drive_t *drive = tape->drive;
4729 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
4731 err = idetape_blkdev_ioctl(drive, cmd, arg);
4735 static struct block_device_operations idetape_block_ops = {
4736 .owner = THIS_MODULE,
4737 .open = idetape_open,
4738 .release = idetape_release,
4739 .ioctl = idetape_ioctl,
4742 static int ide_tape_probe(ide_drive_t *drive)
4744 idetape_tape_t *tape;
4748 if (!strstr("ide-tape", drive->driver_req))
4750 if (!drive->present)
4752 if (drive->media != ide_tape)
4754 if (!idetape_identify_device (drive)) {
4755 printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
4759 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
4762 if (strstr(drive->id->model, "OnStream DI-")) {
4763 printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
4764 printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
4766 tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
4768 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
4772 g = alloc_disk(1 << PARTN_BITS);
4776 ide_init_disk(g, drive);
4778 ide_proc_register_driver(drive, &idetape_driver);
4780 kref_init(&tape->kref);
4782 tape->drive = drive;
4783 tape->driver = &idetape_driver;
4786 g->private_data = &tape->driver;
4788 drive->driver_data = tape;
4790 mutex_lock(&idetape_ref_mutex);
4791 for (minor = 0; idetape_devs[minor]; minor++)
4793 idetape_devs[minor] = tape;
4794 mutex_unlock(&idetape_ref_mutex);
4796 idetape_setup(drive, tape, minor);
4798 device_create(idetape_sysfs_class, &drive->gendev,
4799 MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
4800 device_create(idetape_sysfs_class, &drive->gendev,
4801 MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
4803 g->fops = &idetape_block_ops;
4804 ide_register_region(g);
4814 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4815 MODULE_LICENSE("GPL");
4817 static void __exit idetape_exit (void)
4819 driver_unregister(&idetape_driver.gen_driver);
4820 class_destroy(idetape_sysfs_class);
4821 unregister_chrdev(IDETAPE_MAJOR, "ht");
4824 static int __init idetape_init(void)
4827 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
4828 if (IS_ERR(idetape_sysfs_class)) {
4829 idetape_sysfs_class = NULL;
4830 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
4835 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
4836 printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
4838 goto out_free_class;
4841 error = driver_register(&idetape_driver.gen_driver);
4843 goto out_free_driver;
4848 driver_unregister(&idetape_driver.gen_driver);
4850 class_destroy(idetape_sysfs_class);
4855 MODULE_ALIAS("ide:*m-tape*");
4856 module_init(idetape_init);
4857 module_exit(idetape_exit);
4858 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);