2 * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il>
6 * This driver was constructed as a student project in the software laboratory
7 * of the faculty of electrical engineering in the Technion - Israel's
8 * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
10 * It is hereby placed under the terms of the GNU general public license.
11 * (See linux/COPYING).
15 * IDE ATAPI streaming tape driver.
17 * This driver is a part of the Linux ide driver and works in co-operation
18 * with linux/drivers/block/ide.c.
20 * The driver, in co-operation with ide.c, basically traverses the
21 * request-list for the block device interface. The character device
22 * interface, on the other hand, creates new requests, adds them
23 * to the request-list of the block device, and waits for their completion.
25 * Pipelined operation mode is now supported on both reads and writes.
27 * The block device major and minor numbers are determined from the
28 * tape's relative position in the ide interfaces, as explained in ide.c.
30 * The character device interface consists of the following devices:
32 * ht0 major 37, minor 0 first IDE tape, rewind on close.
33 * ht1 major 37, minor 1 second IDE tape, rewind on close.
35 * nht0 major 37, minor 128 first IDE tape, no rewind on close.
36 * nht1 major 37, minor 129 second IDE tape, no rewind on close.
39 * Run linux/scripts/MAKEDEV.ide to create the above entries.
41 * The general magnetic tape commands compatible interface, as defined by
42 * include/linux/mtio.h, is accessible through the character device.
44 * General ide driver configuration options, such as the interrupt-unmask
45 * flag, can be configured by issuing an ioctl to the block device interface,
46 * as any other ide device.
48 * Our own ide-tape ioctl's can be issued to either the block device or
49 * the character device interface.
51 * Maximal throughput with minimal bus load will usually be achieved in the
54 * 1. ide-tape is operating in the pipelined operation mode.
55 * 2. No buffering is performed by the user backup program.
57 * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive.
59 * Ver 0.1 Nov 1 95 Pre-working code :-)
60 * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure
61 * was successful ! (Using tar cvf ... on the block
63 * A longer backup resulted in major swapping, bad
64 * overall Linux performance and eventually failed as
65 * we received non serial read-ahead requests from the
67 * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the
68 * character device interface. Linux's responsiveness
69 * and performance doesn't seem to be much affected
70 * from the background backup procedure.
71 * Some general mtio.h magnetic tape operations are
72 * now supported by our character device. As a result,
73 * popular tape utilities are starting to work with
75 * The following configurations were tested:
76 * 1. An IDE ATAPI TAPE shares the same interface
77 * and irq with an IDE ATAPI CDROM.
78 * 2. An IDE ATAPI TAPE shares the same interface
79 * and irq with a normal IDE disk.
80 * Both configurations seemed to work just fine !
81 * However, to be on the safe side, it is meanwhile
82 * recommended to give the IDE TAPE its own interface
84 * The one thing which needs to be done here is to
85 * add a "request postpone" feature to ide.c,
86 * so that we won't have to wait for the tape to finish
87 * performing a long media access (DSC) request (such
88 * as a rewind) before we can access the other device
89 * on the same interface. This effect doesn't disturb
90 * normal operation most of the time because read/write
91 * requests are relatively fast, and once we are
92 * performing one tape r/w request, a lot of requests
93 * from the other device can be queued and ide.c will
94 * service all of them after this single tape request.
95 * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree.
96 * On each read / write request, we now ask the drive
97 * if we can transfer a constant number of bytes
98 * (a parameter of the drive) only to its buffers,
99 * without causing actual media access. If we can't,
100 * we just wait until we can by polling the DSC bit.
101 * This ensures that while we are not transferring
102 * more bytes than the constant referred to above, the
103 * interrupt latency will not become too high and
104 * we won't cause an interrupt timeout, as happened
105 * occasionally in the previous version.
106 * While polling for DSC, the current request is
107 * postponed and ide.c is free to handle requests from
108 * the other device. This is handled transparently to
109 * ide.c. The hwgroup locking method which was used
110 * in the previous version was removed.
111 * Use of new general features which are provided by
112 * ide.c for use with atapi devices.
113 * (Programming done by Mark Lord)
114 * Few potential bug fixes (Again, suggested by Mark)
115 * Single character device data transfers are now
116 * not limited in size, as they were before.
117 * We are asking the tape about its recommended
118 * transfer unit and send a larger data transfer
119 * as several transfers of the above size.
120 * For best results, use an integral number of this
121 * basic unit (which is shown during driver
122 * initialization). I will soon add an ioctl to get
123 * this important parameter.
124 * Our data transfer buffer is allocated on startup,
125 * rather than before each data transfer. This should
126 * ensure that we will indeed have a data buffer.
127 * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape
128 * shared an interface with another device.
129 * (poll_for_dsc was a complete mess).
130 * Removed some old (non-active) code which had
131 * to do with supporting buffer cache originated
133 * The block device interface can now be opened, so
134 * that general ide driver features like the unmask
135 * interrupts flag can be selected with an ioctl.
136 * This is the only use of the block device interface.
137 * New fast pipelined operation mode (currently only on
138 * writes). When using the pipelined mode, the
139 * throughput can potentially reach the maximum
140 * tape supported throughput, regardless of the
141 * user backup program. On my tape drive, it sometimes
142 * boosted performance by a factor of 2. Pipelined
143 * mode is enabled by default, but since it has a few
144 * downfalls as well, you may want to disable it.
145 * A short explanation of the pipelined operation mode
146 * is available below.
147 * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition.
148 * Added pipeline read mode. As a result, restores
149 * are now as fast as backups.
150 * Optimized shared interface behavior. The new behavior
151 * typically results in better IDE bus efficiency and
152 * higher tape throughput.
153 * Pre-calculation of the expected read/write request
154 * service time, based on the tape's parameters. In
155 * the pipelined operation mode, this allows us to
156 * adjust our polling frequency to a much lower value,
157 * and thus to dramatically reduce our load on Linux,
158 * without any decrease in performance.
159 * Implemented additional mtio.h operations.
160 * The recommended user block size is returned by
161 * the MTIOCGET ioctl.
162 * Additional minor changes.
163 * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the
164 * use of some block sizes during a restore procedure.
165 * The character device interface will now present a
166 * continuous view of the media - any mix of block sizes
167 * during a backup/restore procedure is supported. The
168 * driver will buffer the requests internally and
169 * convert them to the tape's recommended transfer
170 * unit, making performance almost independent of the
171 * chosen user block size.
172 * Some improvements in error recovery.
173 * By cooperating with ide-dma.c, bus mastering DMA can
174 * now sometimes be used with IDE tape drives as well.
175 * Bus mastering DMA has the potential to dramatically
176 * reduce the CPU's overhead when accessing the device,
177 * and can be enabled by using hdparm -d1 on the tape's
178 * block device interface. For more info, read the
179 * comments in ide-dma.c.
180 * Ver 1.4 Mar 13 96 Fixed serialize support.
181 * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85.
182 * Fixed pipelined read mode inefficiency.
183 * Fixed nasty null dereferencing bug.
184 * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver.
185 * Fixed end of media bug.
186 * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model.
187 * Ver 1.8 Sep 26 96 Attempt to find a better balance between good
188 * interactive response and high system throughput.
189 * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather
190 * than requiring an explicit FSF command.
191 * Abort pending requests at end of media.
192 * MTTELL was sometimes returning incorrect results.
193 * Return the real block size in the MTIOCGET ioctl.
194 * Some error recovery bug fixes.
195 * Ver 1.10 Nov 5 96 Major reorganization.
196 * Reduced CPU overhead a bit by eliminating internal
198 * Added module support.
199 * Added multiple tape drives support.
200 * Added partition support.
201 * Rewrote DSC handling.
202 * Some portability fixes.
203 * Removed ide-tape.h.
204 * Additional minor changes.
205 * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling.
206 * Use ide_stall_queue() for DSC overlap.
207 * Use the maximum speed rather than the current speed
208 * to compute the request service time.
209 * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data
210 * corruption, which could occur if the total number
211 * of bytes written to the tape was not an integral
212 * number of tape blocks.
213 * Add support for INTERRUPT DRQ devices.
214 * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB
215 * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives.
216 * Replace cli()/sti() with hwgroup spinlocks.
217 * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup
218 * spinlock with private per-tape spinlock.
219 * Ver 1.16 Sep 1 99 Add OnStream tape support.
220 * Abort read pipeline on EOD.
221 * Wait for the tape to become ready in case it returns
222 * "in the process of becoming ready" on open().
223 * Fix zero padding of the last written block in
224 * case the tape block size is larger than PAGE_SIZE.
225 * Decrease the default disconnection time to tn.
226 * Ver 1.16e Oct 3 99 Minor fixes.
227 * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen,
228 * niessen@iae.nl / arnold.niessen@philips.com
229 * GO-1) Undefined code in idetape_read_position
230 * according to Gadi's email
231 * AJN-1) Minor fix asc == 11 should be asc == 0x11
232 * in idetape_issue_packet_command (did effect
233 * debugging output only)
234 * AJN-2) Added more debugging output, and
235 * added ide-tape: where missing. I would also
236 * like to add tape->name where possible
237 * AJN-3) Added different debug_level's
238 * via /proc/ide/hdc/settings
239 * "debug_level" determines amount of debugging output;
240 * can be changed using /proc/ide/hdx/settings
241 * 0 : almost no debugging output
242 * 1 : 0+output errors only
243 * 2 : 1+output all sensekey/asc
244 * 3 : 2+follow all chrdev related procedures
245 * 4 : 3+follow all procedures
246 * 5 : 4+include pc_stack rq_stack info
247 * 6 : 5+USE_COUNT updates
248 * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail
249 * from 5 to 10 minutes
250 * AJN-5) Changed maximum number of blocks to skip when
251 * reading tapes with multiple consecutive write
252 * errors from 100 to 1000 in idetape_get_logical_blk
253 * Proposed changes to code:
254 * 1) output "logical_blk_num" via /proc
255 * 2) output "current_operation" via /proc
256 * 3) Either solve or document the fact that `mt rewind' is
257 * required after reading from /dev/nhtx to be
258 * able to rmmod the idetape module;
259 * Also, sometimes an application finishes but the
260 * device remains `busy' for some time. Same cause ?
261 * Proposed changes to release-notes:
262 * 4) write a simple `quickstart' section in the
263 * release notes; I volunteer if you don't want to
264 * 5) include a pointer to video4linux in the doc
265 * to stimulate video applications
266 * 6) release notes lines 331 and 362: explain what happens
267 * if the application data rate is higher than 1100 KB/s;
268 * similar approach to lower-than-500 kB/s ?
269 * 7) 6.6 Comparison; wouldn't it be better to allow different
270 * strategies for read and write ?
271 * Wouldn't it be better to control the tape buffer
272 * contents instead of the bandwidth ?
273 * 8) line 536: replace will by would (if I understand
274 * this section correctly, a hypothetical and unwanted situation
275 * is being described)
276 * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames.
277 * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl
278 * - Add idetape_onstream_mode_sense_tape_parameter_page
279 * function to get tape capacity in frames: tape->capacity.
280 * - Add support for DI-50 drives( or any DI- drive).
281 * - 'workaround' for read error/blank block around block 3000.
282 * - Implement Early warning for end of media for Onstream.
283 * - Cosmetic code changes for readability.
284 * - Idetape_position_tape should not use SKIP bit during
285 * Onstream read recovery.
286 * - Add capacity, logical_blk_num and first/last_frame_position
287 * to /proc/ide/hd?/settings.
288 * - Module use count was gone in the Linux 2.4 driver.
289 * Ver 1.17a Apr 2001 Willem Riede osst@riede.org
290 * - Get drive's actual block size from mode sense block descriptor
291 * - Limit size of pipeline
292 * Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu>
293 * Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used
295 * Actually removed aborted stages in idetape_abort_pipeline
296 * instead of just changing the command code.
297 * Made the transfer byte count for Request Sense equal to the
298 * actual length of the data transfer.
299 * Changed handling of partial data transfers: they do not
301 * Moved initiation of DMA transfers to the correct place.
302 * Removed reference to unallocated memory.
303 * Made __idetape_discard_read_pipeline return the number of
304 * sectors skipped, not the number of stages.
305 * Replaced errant kfree() calls with __idetape_kfree_stage().
306 * Fixed off-by-one error in testing the pipeline length.
307 * Fixed handling of filemarks in the read pipeline.
308 * Small code optimization for MTBSF and MTBSFM ioctls.
309 * Don't try to unlock the door during device close if is
311 * Cosmetic fixes to miscellaneous debugging output messages.
312 * Set the minimum /proc/ide/hd?/settings values for "pipeline",
313 * "pipeline_min", and "pipeline_max" to 1.
315 * Here are some words from the first releases of hd.c, which are quoted
316 * in ide.c and apply here as well:
318 * | Special care is recommended. Have Fun!
323 * An overview of the pipelined operation mode.
325 * In the pipelined write mode, we will usually just add requests to our
326 * pipeline and return immediately, before we even start to service them. The
327 * user program will then have enough time to prepare the next request while
328 * we are still busy servicing previous requests. In the pipelined read mode,
329 * the situation is similar - we add read-ahead requests into the pipeline,
330 * before the user even requested them.
332 * The pipeline can be viewed as a "safety net" which will be activated when
333 * the system load is high and prevents the user backup program from keeping up
334 * with the current tape speed. At this point, the pipeline will get
335 * shorter and shorter but the tape will still be streaming at the same speed.
336 * Assuming we have enough pipeline stages, the system load will hopefully
337 * decrease before the pipeline is completely empty, and the backup program
338 * will be able to "catch up" and refill the pipeline again.
340 * When using the pipelined mode, it would be best to disable any type of
341 * buffering done by the user program, as ide-tape already provides all the
342 * benefits in the kernel, where it can be done in a more efficient way.
343 * As we will usually not block the user program on a request, the most
344 * efficient user code will then be a simple read-write-read-... cycle.
345 * Any additional logic will usually just slow down the backup process.
347 * Using the pipelined mode, I get a constant over 400 KBps throughput,
348 * which seems to be the maximum throughput supported by my tape.
350 * However, there are some downfalls:
352 * 1. We use memory (for data buffers) in proportional to the number
353 * of pipeline stages (each stage is about 26 KB with my tape).
354 * 2. In the pipelined write mode, we cheat and postpone error codes
355 * to the user task. In read mode, the actual tape position
356 * will be a bit further than the last requested block.
360 * 1. We allocate stages dynamically only when we need them. When
361 * we don't need them, we don't consume additional memory. In
362 * case we can't allocate stages, we just manage without them
363 * (at the expense of decreased throughput) so when Linux is
364 * tight in memory, we will not pose additional difficulties.
366 * 2. The maximum number of stages (which is, in fact, the maximum
367 * amount of memory) which we allocate is limited by the compile
368 * time parameter IDETAPE_MAX_PIPELINE_STAGES.
370 * 3. The maximum number of stages is a controlled parameter - We
371 * don't start from the user defined maximum number of stages
372 * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we
373 * will not even allocate this amount of stages if the user
374 * program can't handle the speed). We then implement a feedback
375 * loop which checks if the pipeline is empty, and if it is, we
376 * increase the maximum number of stages as necessary until we
377 * reach the optimum value which just manages to keep the tape
378 * busy with minimum allocated memory or until we reach
379 * IDETAPE_MAX_PIPELINE_STAGES.
383 * In pipelined write mode, ide-tape can not return accurate error codes
384 * to the user program since we usually just add the request to the
385 * pipeline without waiting for it to be serviced. In case an error
386 * occurs, I will report it on the next user request.
388 * In the pipelined read mode, subsequent read requests or forward
389 * filemark spacing will perform correctly, as we preserve all blocks
390 * and filemarks which we encountered during our excess read-ahead.
392 * For accurate tape positioning and error reporting, disabling
393 * pipelined mode might be the best option.
395 * You can enable/disable/tune the pipelined operation mode by adjusting
396 * the compile time parameters below.
400 * Possible improvements.
402 * 1. Support for the ATAPI overlap protocol.
404 * In order to maximize bus throughput, we currently use the DSC
405 * overlap method which enables ide.c to service requests from the
406 * other device while the tape is busy executing a command. The
407 * DSC overlap method involves polling the tape's status register
408 * for the DSC bit, and servicing the other device while the tape
411 * In the current QIC development standard (December 1995),
412 * it is recommended that new tape drives will *in addition*
413 * implement the ATAPI overlap protocol, which is used for the
414 * same purpose - efficient use of the IDE bus, but is interrupt
415 * driven and thus has much less CPU overhead.
417 * ATAPI overlap is likely to be supported in most new ATAPI
418 * devices, including new ATAPI cdroms, and thus provides us
419 * a method by which we can achieve higher throughput when
420 * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device.
423 #define IDETAPE_VERSION "1.19"
425 #include <linux/module.h>
426 #include <linux/types.h>
427 #include <linux/string.h>
428 #include <linux/kernel.h>
429 #include <linux/delay.h>
430 #include <linux/timer.h>
431 #include <linux/mm.h>
432 #include <linux/interrupt.h>
433 #include <linux/jiffies.h>
434 #include <linux/major.h>
435 #include <linux/errno.h>
436 #include <linux/genhd.h>
437 #include <linux/slab.h>
438 #include <linux/pci.h>
439 #include <linux/ide.h>
440 #include <linux/smp_lock.h>
441 #include <linux/completion.h>
442 #include <linux/bitops.h>
443 #include <linux/mutex.h>
445 #include <asm/byteorder.h>
447 #include <asm/uaccess.h>
449 #include <asm/unaligned.h>
454 typedef struct os_partition_s
{
458 __u32 first_frame_addr
;
459 __u32 last_frame_addr
;
460 __u32 eod_frame_addr
;
466 typedef struct os_dat_entry_s
{
476 #define OS_DAT_FLAGS_DATA (0xc)
477 #define OS_DAT_FLAGS_MARK (0x1)
479 typedef struct os_dat_s
{
484 os_dat_entry_t dat_list
[16];
487 #include <linux/mtio.h>
489 /**************************** Tunable parameters *****************************/
493 * Pipelined mode parameters.
495 * We try to use the minimum number of stages which is enough to
496 * keep the tape constantly streaming. To accomplish that, we implement
497 * a feedback loop around the maximum number of stages:
499 * We start from MIN maximum stages (we will not even use MIN stages
500 * if we don't need them), increment it by RATE*(MAX-MIN)
501 * whenever we sense that the pipeline is empty, until we reach
502 * the optimum value or until we reach MAX.
504 * Setting the following parameter to 0 is illegal: the pipelined mode
505 * cannot be disabled (calculate_speeds() divides by tape->max_stages.)
507 #define IDETAPE_MIN_PIPELINE_STAGES 1
508 #define IDETAPE_MAX_PIPELINE_STAGES 400
509 #define IDETAPE_INCREASE_STAGES_RATE 20
512 * The following are used to debug the driver:
514 * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities.
515 * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control.
516 * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in
519 * Setting them to 0 will restore normal operation mode:
521 * 1. Disable logging normal successful operations.
522 * 2. Disable self-sanity checks.
523 * 3. Errors will still be logged, of course.
525 * All the #if DEBUG code will be removed some day, when the driver
526 * is verified to be stable enough. This will make it much more
529 #define IDETAPE_DEBUG_INFO 0
530 #define IDETAPE_DEBUG_LOG 0
531 #define IDETAPE_DEBUG_BUGS 1
534 * After each failed packet command we issue a request sense command
535 * and retry the packet command IDETAPE_MAX_PC_RETRIES times.
537 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
539 #define IDETAPE_MAX_PC_RETRIES 3
542 * With each packet command, we allocate a buffer of
543 * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
544 * commands (Not for READ/WRITE commands).
546 #define IDETAPE_PC_BUFFER_SIZE 256
549 * In various places in the driver, we need to allocate storage
550 * for packet commands and requests, which will remain valid while
551 * we leave the driver to wait for an interrupt or a timeout event.
553 #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
556 * Some drives (for example, Seagate STT3401A Travan) require a very long
557 * timeout, because they don't return an interrupt or clear their busy bit
558 * until after the command completes (even retension commands).
560 #define IDETAPE_WAIT_CMD (900*HZ)
563 * The following parameter is used to select the point in the internal
564 * tape fifo in which we will start to refill the buffer. Decreasing
565 * the following parameter will improve the system's latency and
566 * interactive response, while using a high value might improve system
569 #define IDETAPE_FIFO_THRESHOLD 2
572 * DSC polling parameters.
574 * Polling for DSC (a single bit in the status register) is a very
575 * important function in ide-tape. There are two cases in which we
578 * 1. Before a read/write packet command, to ensure that we
579 * can transfer data from/to the tape's data buffers, without
580 * causing an actual media access. In case the tape is not
581 * ready yet, we take out our request from the device
582 * request queue, so that ide.c will service requests from
583 * the other device on the same interface meanwhile.
585 * 2. After the successful initialization of a "media access
586 * packet command", which is a command which can take a long
587 * time to complete (it can be several seconds or even an hour).
589 * Again, we postpone our request in the middle to free the bus
590 * for the other device. The polling frequency here should be
591 * lower than the read/write frequency since those media access
592 * commands are slow. We start from a "fast" frequency -
593 * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
594 * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
595 * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
597 * We also set a timeout for the timer, in case something goes wrong.
598 * The timeout should be longer then the maximum execution time of a
605 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
606 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
607 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
608 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
609 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
610 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
611 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
613 /*************************** End of tunable parameters ***********************/
616 * Read/Write error simulation
618 #define SIMULATE_ERRORS 0
621 * For general magnetic tape device compatibility.
624 idetape_direction_none
,
625 idetape_direction_read
,
626 idetape_direction_write
627 } idetape_chrdev_direction_t
;
632 struct idetape_bh
*b_reqnext
;
637 * Our view of a packet command.
639 typedef struct idetape_packet_command_s
{
640 u8 c
[12]; /* Actual packet bytes */
641 int retries
; /* On each retry, we increment retries */
642 int error
; /* Error code */
643 int request_transfer
; /* Bytes to transfer */
644 int actually_transferred
; /* Bytes actually transferred */
645 int buffer_size
; /* Size of our data buffer */
646 struct idetape_bh
*bh
;
649 u8
*buffer
; /* Data buffer */
650 u8
*current_position
; /* Pointer into the above buffer */
651 ide_startstop_t (*callback
) (ide_drive_t
*); /* Called when this packet command is completed */
652 u8 pc_buffer
[IDETAPE_PC_BUFFER_SIZE
]; /* Temporary buffer */
653 unsigned long flags
; /* Status/Action bit flags: long for set_bit */
657 * Packet command flag bits.
659 /* Set when an error is considered normal - We won't retry */
661 /* 1 When polling for DSC on a media access command */
662 #define PC_WAIT_FOR_DSC 1
663 /* 1 when we prefer to use DMA if possible */
664 #define PC_DMA_RECOMMENDED 2
665 /* 1 while DMA in progress */
666 #define PC_DMA_IN_PROGRESS 3
667 /* 1 when encountered problem during DMA */
668 #define PC_DMA_ERROR 4
673 * Capabilities and Mechanical Status Page
676 unsigned page_code
:6; /* Page code - Should be 0x2a */
678 __u8 ps
:1; /* parameters saveable */
679 __u8 page_length
; /* Page Length - Should be 0x12 */
680 __u8 reserved2
, reserved3
;
681 unsigned ro
:1; /* Read Only Mode */
682 unsigned reserved4_1234
:4;
683 unsigned sprev
:1; /* Supports SPACE in the reverse direction */
684 unsigned reserved4_67
:2;
685 unsigned reserved5_012
:3;
686 unsigned efmt
:1; /* Supports ERASE command initiated formatting */
687 unsigned reserved5_4
:1;
688 unsigned qfa
:1; /* Supports the QFA two partition formats */
689 unsigned reserved5_67
:2;
690 unsigned lock
:1; /* Supports locking the volume */
691 unsigned locked
:1; /* The volume is locked */
692 unsigned prevent
:1; /* The device defaults in the prevent state after power up */
693 unsigned eject
:1; /* The device can eject the volume */
694 __u8 disconnect
:1; /* The device can break request > ctl */
696 unsigned ecc
:1; /* Supports error correction */
697 unsigned cmprs
:1; /* Supports data compression */
698 unsigned reserved7_0
:1;
699 unsigned blk512
:1; /* Supports 512 bytes block size */
700 unsigned blk1024
:1; /* Supports 1024 bytes block size */
701 unsigned reserved7_3_6
:4;
702 unsigned blk32768
:1; /* slowb - the device restricts the byte count for PIO */
703 /* transfers for slow buffer memory ??? */
704 /* Also 32768 block size in some cases */
705 __u16 max_speed
; /* Maximum speed supported in KBps */
706 __u8 reserved10
, reserved11
;
707 __u16 ctl
; /* Continuous Transfer Limit in blocks */
708 __u16 speed
; /* Current Speed, in KBps */
709 __u16 buffer_size
; /* Buffer Size, in 512 bytes */
710 __u8 reserved18
, reserved19
;
711 } idetape_capabilities_page_t
;
717 unsigned page_code
:6; /* Page code - Should be 0x30 */
718 unsigned reserved1_6
:1;
720 __u8 page_length
; /* Page Length - Should be 2 */
723 unsigned play32_5
:1;
724 unsigned reserved2_23
:2;
725 unsigned record32
:1;
726 unsigned record32_5
:1;
727 unsigned reserved2_6
:1;
729 } idetape_block_size_page_t
;
734 typedef struct idetape_stage_s
{
735 struct request rq
; /* The corresponding request */
736 struct idetape_bh
*bh
; /* The data buffers */
737 struct idetape_stage_s
*next
; /* Pointer to the next stage */
741 * REQUEST SENSE packet command result - Data Format.
744 unsigned error_code
:7; /* Current of deferred errors */
745 unsigned valid
:1; /* The information field conforms to QIC-157C */
746 __u8 reserved1
:8; /* Segment Number - Reserved */
747 unsigned sense_key
:4; /* Sense Key */
748 unsigned reserved2_4
:1; /* Reserved */
749 unsigned ili
:1; /* Incorrect Length Indicator */
750 unsigned eom
:1; /* End Of Medium */
751 unsigned filemark
:1; /* Filemark */
752 __u32 information
__attribute__ ((packed
));
753 __u8 asl
; /* Additional sense length (n-7) */
754 __u32 command_specific
; /* Additional command specific information */
755 __u8 asc
; /* Additional Sense Code */
756 __u8 ascq
; /* Additional Sense Code Qualifier */
757 __u8 replaceable_unit_code
; /* Field Replaceable Unit Code */
758 unsigned sk_specific1
:7; /* Sense Key Specific */
759 unsigned sksv
:1; /* Sense Key Specific information is valid */
760 __u8 sk_specific2
; /* Sense Key Specific */
761 __u8 sk_specific3
; /* Sense Key Specific */
762 __u8 pad
[2]; /* Padding to 20 bytes */
763 } idetape_request_sense_result_t
;
767 * Most of our global data which we need to save even as we leave the
768 * driver due to an interrupt or a timer event is stored in a variable
769 * of type idetape_tape_t, defined below.
771 typedef struct ide_tape_obj
{
773 ide_driver_t
*driver
;
774 struct gendisk
*disk
;
778 * Since a typical character device operation requires more
779 * than one packet command, we provide here enough memory
780 * for the maximum of interconnected packet commands.
781 * The packet commands are stored in the circular array pc_stack.
782 * pc_stack_index points to the last used entry, and warps around
783 * to the start when we get to the last array entry.
785 * pc points to the current processed packet command.
787 * failed_pc points to the last failed packet command, or contains
788 * NULL if we do not need to retry any packet command. This is
789 * required since an additional packet command is needed before the
790 * retry, to get detailed information on what went wrong.
792 /* Current packet command */
794 /* Last failed packet command */
795 idetape_pc_t
*failed_pc
;
796 /* Packet command stack */
797 idetape_pc_t pc_stack
[IDETAPE_PC_STACK
];
798 /* Next free packet command storage space */
800 struct request rq_stack
[IDETAPE_PC_STACK
];
801 /* We implement a circular array */
805 * DSC polling variables.
807 * While polling for DSC we use postponed_rq to postpone the
808 * current request so that ide.c will be able to service
809 * pending requests on the other device. Note that at most
810 * we will have only one DSC (usually data transfer) request
811 * in the device request queue. Additional requests can be
812 * queued in our internal pipeline, but they will be visible
813 * to ide.c only one at a time.
815 struct request
*postponed_rq
;
816 /* The time in which we started polling for DSC */
817 unsigned long dsc_polling_start
;
818 /* Timer used to poll for dsc */
819 struct timer_list dsc_timer
;
820 /* Read/Write dsc polling frequency */
821 unsigned long best_dsc_rw_frequency
;
822 /* The current polling frequency */
823 unsigned long dsc_polling_frequency
;
824 /* Maximum waiting time */
825 unsigned long dsc_timeout
;
828 * Read position information
832 unsigned int first_frame_position
;
833 unsigned int last_frame_position
;
834 unsigned int blocks_in_buffer
;
837 * Last error information
839 u8 sense_key
, asc
, ascq
;
842 * Character device operation
847 /* Current character device data transfer direction */
848 idetape_chrdev_direction_t chrdev_direction
;
853 /* Usually 512 or 1024 bytes */
854 unsigned short tape_block_size
;
856 /* Copy of the tape's Capabilities and Mechanical Page */
857 idetape_capabilities_page_t capabilities
;
860 * Active data transfer request parameters.
862 * At most, there is only one ide-tape originated data transfer
863 * request in the device request queue. This allows ide.c to
864 * easily service requests from the other device when we
865 * postpone our active request. In the pipelined operation
866 * mode, we use our internal pipeline structure to hold
867 * more data requests.
869 * The data buffer size is chosen based on the tape's
872 /* Pointer to the request which is waiting in the device request queue */
873 struct request
*active_data_request
;
874 /* Data buffer size (chosen based on the tape's recommendation */
876 idetape_stage_t
*merge_stage
;
877 int merge_stage_size
;
878 struct idetape_bh
*bh
;
883 * Pipeline parameters.
885 * To accomplish non-pipelined mode, we simply set the following
886 * variables to zero (or NULL, where appropriate).
888 /* Number of currently used stages */
890 /* Number of pending stages */
891 int nr_pending_stages
;
892 /* We will not allocate more than this number of stages */
893 int max_stages
, min_pipeline
, max_pipeline
;
894 /* The first stage which will be removed from the pipeline */
895 idetape_stage_t
*first_stage
;
896 /* The currently active stage */
897 idetape_stage_t
*active_stage
;
898 /* Will be serviced after the currently active request */
899 idetape_stage_t
*next_stage
;
900 /* New requests will be added to the pipeline here */
901 idetape_stage_t
*last_stage
;
902 /* Optional free stage which we can use */
903 idetape_stage_t
*cache_stage
;
905 /* Wasted space in each stage */
908 /* Status/Action flags: long for set_bit */
910 /* protects the ide-tape queue */
914 * Measures average tape speed
916 unsigned long avg_time
;
920 /* last sense information */
921 idetape_request_sense_result_t sense
;
925 char firmware_revision
[6];
926 int firmware_revision_num
;
928 /* the door is currently locked */
930 /* the tape hardware is write protected */
932 /* the tape is write protected (hardware or opened as read-only) */
936 * Limit the number of times a request can
937 * be postponed, to avoid an infinite postpone
940 /* request postpone count limit */
944 * Measures number of frames:
946 * 1. written/read to/from the driver pipeline (pipeline_head).
947 * 2. written/read to/from the tape buffers (idetape_bh).
948 * 3. written/read by the tape to/from the media (tape_head).
956 * Speed control at the tape buffers input/output
958 unsigned long insert_time
;
961 int max_insert_speed
;
962 int measure_insert_time
;
965 * Measure tape still time, in milliseconds
967 unsigned long tape_still_time_begin
;
971 * Speed regulation negative feedback loop
974 int pipeline_head_speed
;
975 int controlled_pipeline_head_speed
;
976 int uncontrolled_pipeline_head_speed
;
977 int controlled_last_pipeline_head
;
978 int uncontrolled_last_pipeline_head
;
979 unsigned long uncontrolled_pipeline_head_time
;
980 unsigned long controlled_pipeline_head_time
;
981 int controlled_previous_pipeline_head
;
982 int uncontrolled_previous_pipeline_head
;
983 unsigned long controlled_previous_head_time
;
984 unsigned long uncontrolled_previous_head_time
;
985 int restart_speed_control_req
;
988 * Debug_level determines amount of debugging output;
989 * can be changed using /proc/ide/hdx/settings
990 * 0 : almost no debugging output
991 * 1 : 0+output errors only
992 * 2 : 1+output all sensekey/asc
993 * 3 : 2+follow all chrdev related procedures
994 * 4 : 3+follow all procedures
995 * 5 : 4+include pc_stack rq_stack info
996 * 6 : 5+USE_COUNT updates
1001 static DEFINE_MUTEX(idetape_ref_mutex
);
1003 static struct class *idetape_sysfs_class
;
1005 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
1007 #define ide_tape_g(disk) \
1008 container_of((disk)->private_data, struct ide_tape_obj, driver)
1010 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
1012 struct ide_tape_obj
*tape
= NULL
;
1014 mutex_lock(&idetape_ref_mutex
);
1015 tape
= ide_tape_g(disk
);
1017 kref_get(&tape
->kref
);
1018 mutex_unlock(&idetape_ref_mutex
);
1022 static void ide_tape_release(struct kref
*);
1024 static void ide_tape_put(struct ide_tape_obj
*tape
)
1026 mutex_lock(&idetape_ref_mutex
);
1027 kref_put(&tape
->kref
, ide_tape_release
);
1028 mutex_unlock(&idetape_ref_mutex
);
1034 #define DOOR_UNLOCKED 0
1035 #define DOOR_LOCKED 1
1036 #define DOOR_EXPLICITLY_LOCKED 2
1039 * Tape flag bits values.
1041 #define IDETAPE_IGNORE_DSC 0
1042 #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
1043 #define IDETAPE_BUSY 2 /* Device already opened */
1044 #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
1045 #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
1046 #define IDETAPE_FILEMARK 5 /* Currently on a filemark */
1047 #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
1048 #define IDETAPE_READ_ERROR 7
1049 #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
1050 /* 0 = no tape is loaded, so we don't rewind after ejecting */
1051 #define IDETAPE_MEDIUM_PRESENT 9
1054 * Supported ATAPI tape drives packet commands
1056 #define IDETAPE_TEST_UNIT_READY_CMD 0x00
1057 #define IDETAPE_REWIND_CMD 0x01
1058 #define IDETAPE_REQUEST_SENSE_CMD 0x03
1059 #define IDETAPE_READ_CMD 0x08
1060 #define IDETAPE_WRITE_CMD 0x0a
1061 #define IDETAPE_WRITE_FILEMARK_CMD 0x10
1062 #define IDETAPE_SPACE_CMD 0x11
1063 #define IDETAPE_INQUIRY_CMD 0x12
1064 #define IDETAPE_ERASE_CMD 0x19
1065 #define IDETAPE_MODE_SENSE_CMD 0x1a
1066 #define IDETAPE_MODE_SELECT_CMD 0x15
1067 #define IDETAPE_LOAD_UNLOAD_CMD 0x1b
1068 #define IDETAPE_PREVENT_CMD 0x1e
1069 #define IDETAPE_LOCATE_CMD 0x2b
1070 #define IDETAPE_READ_POSITION_CMD 0x34
1071 #define IDETAPE_READ_BUFFER_CMD 0x3c
1072 #define IDETAPE_SET_SPEED_CMD 0xbb
1075 * Some defines for the READ BUFFER command
1077 #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
1080 * Some defines for the SPACE command
1082 #define IDETAPE_SPACE_OVER_FILEMARK 1
1083 #define IDETAPE_SPACE_TO_EOD 3
1086 * Some defines for the LOAD UNLOAD command
1088 #define IDETAPE_LU_LOAD_MASK 1
1089 #define IDETAPE_LU_RETENSION_MASK 2
1090 #define IDETAPE_LU_EOT_MASK 4
1093 * Special requests for our block device strategy routine.
1095 * In order to service a character device command, we add special
1096 * requests to the tail of our block device request queue and wait
1097 * for their completion.
1101 REQ_IDETAPE_PC1
= (1 << 0), /* packet command (first stage) */
1102 REQ_IDETAPE_PC2
= (1 << 1), /* packet command (second stage) */
1103 REQ_IDETAPE_READ
= (1 << 2),
1104 REQ_IDETAPE_WRITE
= (1 << 3),
1105 REQ_IDETAPE_READ_BUFFER
= (1 << 4),
1109 * Error codes which are returned in rq->errors to the higher part
1112 #define IDETAPE_ERROR_GENERAL 101
1113 #define IDETAPE_ERROR_FILEMARK 102
1114 #define IDETAPE_ERROR_EOD 103
1117 * The following is used to format the general configuration word of
1118 * the ATAPI IDENTIFY DEVICE command.
1120 struct idetape_id_gcw
{
1121 unsigned packet_size
:2; /* Packet Size */
1122 unsigned reserved234
:3; /* Reserved */
1123 unsigned drq_type
:2; /* Command packet DRQ type */
1124 unsigned removable
:1; /* Removable media */
1125 unsigned device_type
:5; /* Device type */
1126 unsigned reserved13
:1; /* Reserved */
1127 unsigned protocol
:2; /* Protocol type */
1131 * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C)
1134 unsigned device_type
:5; /* Peripheral Device Type */
1135 unsigned reserved0_765
:3; /* Peripheral Qualifier - Reserved */
1136 unsigned reserved1_6t0
:7; /* Reserved */
1137 unsigned rmb
:1; /* Removable Medium Bit */
1138 unsigned ansi_version
:3; /* ANSI Version */
1139 unsigned ecma_version
:3; /* ECMA Version */
1140 unsigned iso_version
:2; /* ISO Version */
1141 unsigned response_format
:4; /* Response Data Format */
1142 unsigned reserved3_45
:2; /* Reserved */
1143 unsigned reserved3_6
:1; /* TrmIOP - Reserved */
1144 unsigned reserved3_7
:1; /* AENC - Reserved */
1145 __u8 additional_length
; /* Additional Length (total_length-4) */
1146 __u8 rsv5
, rsv6
, rsv7
; /* Reserved */
1147 __u8 vendor_id
[8]; /* Vendor Identification */
1148 __u8 product_id
[16]; /* Product Identification */
1149 __u8 revision_level
[4]; /* Revision Level */
1150 __u8 vendor_specific
[20]; /* Vendor Specific - Optional */
1151 __u8 reserved56t95
[40]; /* Reserved - Optional */
1152 /* Additional information may be returned */
1153 } idetape_inquiry_result_t
;
1156 * READ POSITION packet command - Data Format (From Table 6-57)
1159 unsigned reserved0_10
:2; /* Reserved */
1160 unsigned bpu
:1; /* Block Position Unknown */
1161 unsigned reserved0_543
:3; /* Reserved */
1162 unsigned eop
:1; /* End Of Partition */
1163 unsigned bop
:1; /* Beginning Of Partition */
1164 u8 partition
; /* Partition Number */
1165 u8 reserved2
, reserved3
; /* Reserved */
1166 u32 first_block
; /* First Block Location */
1167 u32 last_block
; /* Last Block Location (Optional) */
1168 u8 reserved12
; /* Reserved */
1169 u8 blocks_in_buffer
[3]; /* Blocks In Buffer - (Optional) */
1170 u32 bytes_in_buffer
; /* Bytes In Buffer (Optional) */
1171 } idetape_read_position_result_t
;
1174 * Follows structures which are related to the SELECT SENSE / MODE SENSE
1175 * packet commands. Those packet commands are still not supported
1178 #define IDETAPE_BLOCK_DESCRIPTOR 0
1179 #define IDETAPE_CAPABILITIES_PAGE 0x2a
1180 #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */
1181 #define IDETAPE_BLOCK_SIZE_PAGE 0x30
1182 #define IDETAPE_BUFFER_FILLING_PAGE 0x33
1185 * Mode Parameter Header for the MODE SENSE packet command
1188 __u8 mode_data_length
; /* Length of the following data transfer */
1189 __u8 medium_type
; /* Medium Type */
1190 __u8 dsp
; /* Device Specific Parameter */
1191 __u8 bdl
; /* Block Descriptor Length */
1193 /* data transfer page */
1195 __u8 reserved0_6
:1;
1196 __u8 ps
:1; /* parameters saveable */
1197 __u8 page_length
; /* page Length == 0x02 */
1199 __u8 read32k
:1; /* 32k blk size (data only) */
1200 __u8 read32k5
:1; /* 32.5k blk size (data&AUX) */
1201 __u8 reserved3_23
:2;
1202 __u8 write32k
:1; /* 32k blk size (data only) */
1203 __u8 write32k5
:1; /* 32.5k blk size (data&AUX) */
1204 __u8 reserved3_6
:1;
1205 __u8 streaming
:1; /* streaming mode enable */
1207 } idetape_mode_parameter_header_t
;
1210 * Mode Parameter Block Descriptor the MODE SENSE packet command
1212 * Support for block descriptors is optional.
1215 __u8 density_code
; /* Medium density code */
1216 __u8 blocks
[3]; /* Number of blocks */
1217 __u8 reserved4
; /* Reserved */
1218 __u8 length
[3]; /* Block Length */
1219 } idetape_parameter_block_descriptor_t
;
1222 * The Data Compression Page, as returned by the MODE SENSE packet command.
1225 unsigned page_code
:6; /* Page Code - Should be 0xf */
1226 unsigned reserved0
:1; /* Reserved */
1228 __u8 page_length
; /* Page Length - Should be 14 */
1229 unsigned reserved2
:6; /* Reserved */
1230 unsigned dcc
:1; /* Data Compression Capable */
1231 unsigned dce
:1; /* Data Compression Enable */
1232 unsigned reserved3
:5; /* Reserved */
1233 unsigned red
:2; /* Report Exception on Decompression */
1234 unsigned dde
:1; /* Data Decompression Enable */
1235 __u32 ca
; /* Compression Algorithm */
1236 __u32 da
; /* Decompression Algorithm */
1237 __u8 reserved
[4]; /* Reserved */
1238 } idetape_data_compression_page_t
;
1241 * The Medium Partition Page, as returned by the MODE SENSE packet command.
1244 unsigned page_code
:6; /* Page Code - Should be 0x11 */
1245 unsigned reserved1_6
:1; /* Reserved */
1247 __u8 page_length
; /* Page Length - Should be 6 */
1248 __u8 map
; /* Maximum Additional Partitions - Should be 0 */
1249 __u8 apd
; /* Additional Partitions Defined - Should be 0 */
1250 unsigned reserved4_012
:3; /* Reserved */
1251 unsigned psum
:2; /* Should be 0 */
1252 unsigned idp
:1; /* Should be 0 */
1253 unsigned sdp
:1; /* Should be 0 */
1254 unsigned fdp
:1; /* Fixed Data Partitions */
1255 __u8 mfr
; /* Medium Format Recognition */
1256 __u8 reserved
[2]; /* Reserved */
1257 } idetape_medium_partition_page_t
;
1260 * Run time configurable parameters.
1263 int dsc_rw_frequency
;
1264 int dsc_media_access_frequency
;
1269 * The variables below are used for the character device interface.
1270 * Additional state variables are defined in our ide_drive_t structure.
1272 static struct ide_tape_obj
* idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
1274 #define ide_tape_f(file) ((file)->private_data)
1276 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
1278 struct ide_tape_obj
*tape
= NULL
;
1280 mutex_lock(&idetape_ref_mutex
);
1281 tape
= idetape_devs
[i
];
1283 kref_get(&tape
->kref
);
1284 mutex_unlock(&idetape_ref_mutex
);
1289 * Function declarations
1292 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
);
1293 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
);
1296 * Too bad. The drive wants to send us data which we are not ready to accept.
1297 * Just throw it away.
1299 static void idetape_discard_data (ide_drive_t
*drive
, unsigned int bcount
)
1302 (void) HWIF(drive
)->INB(IDE_DATA_REG
);
1305 static void idetape_input_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
1307 struct idetape_bh
*bh
= pc
->bh
;
1311 #if IDETAPE_DEBUG_BUGS
1313 printk(KERN_ERR
"ide-tape: bh == NULL in "
1314 "idetape_input_buffers\n");
1315 idetape_discard_data(drive
, bcount
);
1318 #endif /* IDETAPE_DEBUG_BUGS */
1319 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), bcount
);
1320 HWIF(drive
)->atapi_input_bytes(drive
, bh
->b_data
+ atomic_read(&bh
->b_count
), count
);
1322 atomic_add(count
, &bh
->b_count
);
1323 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
1326 atomic_set(&bh
->b_count
, 0);
1332 static void idetape_output_buffers (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int bcount
)
1334 struct idetape_bh
*bh
= pc
->bh
;
1338 #if IDETAPE_DEBUG_BUGS
1340 printk(KERN_ERR
"ide-tape: bh == NULL in "
1341 "idetape_output_buffers\n");
1344 #endif /* IDETAPE_DEBUG_BUGS */
1345 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
1346 HWIF(drive
)->atapi_output_bytes(drive
, pc
->b_data
, count
);
1348 pc
->b_data
+= count
;
1349 pc
->b_count
-= count
;
1351 pc
->bh
= bh
= bh
->b_reqnext
;
1353 pc
->b_data
= bh
->b_data
;
1354 pc
->b_count
= atomic_read(&bh
->b_count
);
1360 static void idetape_update_buffers (idetape_pc_t
*pc
)
1362 struct idetape_bh
*bh
= pc
->bh
;
1364 unsigned int bcount
= pc
->actually_transferred
;
1366 if (test_bit(PC_WRITING
, &pc
->flags
))
1369 #if IDETAPE_DEBUG_BUGS
1371 printk(KERN_ERR
"ide-tape: bh == NULL in "
1372 "idetape_update_buffers\n");
1375 #endif /* IDETAPE_DEBUG_BUGS */
1376 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
1377 atomic_set(&bh
->b_count
, count
);
1378 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
1386 * idetape_next_pc_storage returns a pointer to a place in which we can
1387 * safely store a packet command, even though we intend to leave the
1388 * driver. A storage space for a maximum of IDETAPE_PC_STACK packet
1389 * commands is allocated at initialization time.
1391 static idetape_pc_t
*idetape_next_pc_storage (ide_drive_t
*drive
)
1393 idetape_tape_t
*tape
= drive
->driver_data
;
1395 #if IDETAPE_DEBUG_LOG
1396 if (tape
->debug_level
>= 5)
1397 printk(KERN_INFO
"ide-tape: pc_stack_index=%d\n",
1398 tape
->pc_stack_index
);
1399 #endif /* IDETAPE_DEBUG_LOG */
1400 if (tape
->pc_stack_index
== IDETAPE_PC_STACK
)
1401 tape
->pc_stack_index
=0;
1402 return (&tape
->pc_stack
[tape
->pc_stack_index
++]);
1406 * idetape_next_rq_storage is used along with idetape_next_pc_storage.
1407 * Since we queue packet commands in the request queue, we need to
1408 * allocate a request, along with the allocation of a packet command.
1411 /**************************************************************
1413 * This should get fixed to use kmalloc(.., GFP_ATOMIC) *
1414 * followed later on by kfree(). -ml *
1416 **************************************************************/
1418 static struct request
*idetape_next_rq_storage (ide_drive_t
*drive
)
1420 idetape_tape_t
*tape
= drive
->driver_data
;
1422 #if IDETAPE_DEBUG_LOG
1423 if (tape
->debug_level
>= 5)
1424 printk(KERN_INFO
"ide-tape: rq_stack_index=%d\n",
1425 tape
->rq_stack_index
);
1426 #endif /* IDETAPE_DEBUG_LOG */
1427 if (tape
->rq_stack_index
== IDETAPE_PC_STACK
)
1428 tape
->rq_stack_index
=0;
1429 return (&tape
->rq_stack
[tape
->rq_stack_index
++]);
1433 * idetape_init_pc initializes a packet command.
1435 static void idetape_init_pc (idetape_pc_t
*pc
)
1437 memset(pc
->c
, 0, 12);
1440 pc
->request_transfer
= 0;
1441 pc
->buffer
= pc
->pc_buffer
;
1442 pc
->buffer_size
= IDETAPE_PC_BUFFER_SIZE
;
1448 * idetape_analyze_error is called on each failed packet command retry
1449 * to analyze the request sense. We currently do not utilize this
1452 static void idetape_analyze_error (ide_drive_t
*drive
, idetape_request_sense_result_t
*result
)
1454 idetape_tape_t
*tape
= drive
->driver_data
;
1455 idetape_pc_t
*pc
= tape
->failed_pc
;
1457 tape
->sense
= *result
;
1458 tape
->sense_key
= result
->sense_key
;
1459 tape
->asc
= result
->asc
;
1460 tape
->ascq
= result
->ascq
;
1461 #if IDETAPE_DEBUG_LOG
1463 * Without debugging, we only log an error if we decided to
1466 if (tape
->debug_level
>= 1)
1467 printk(KERN_INFO
"ide-tape: pc = %x, sense key = %x, "
1468 "asc = %x, ascq = %x\n",
1469 pc
->c
[0], result
->sense_key
,
1470 result
->asc
, result
->ascq
);
1471 #endif /* IDETAPE_DEBUG_LOG */
1474 * Correct pc->actually_transferred by asking the tape.
1476 if (test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1477 pc
->actually_transferred
= pc
->request_transfer
- tape
->tape_block_size
* ntohl(get_unaligned(&result
->information
));
1478 idetape_update_buffers(pc
);
1482 * If error was the result of a zero-length read or write command,
1483 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
1484 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
1486 if ((pc
->c
[0] == IDETAPE_READ_CMD
|| pc
->c
[0] == IDETAPE_WRITE_CMD
)
1487 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) { /* length==0 */
1488 if (result
->sense_key
== 5) {
1489 /* don't report an error, everything's ok */
1491 /* don't retry read/write */
1492 set_bit(PC_ABORT
, &pc
->flags
);
1495 if (pc
->c
[0] == IDETAPE_READ_CMD
&& result
->filemark
) {
1496 pc
->error
= IDETAPE_ERROR_FILEMARK
;
1497 set_bit(PC_ABORT
, &pc
->flags
);
1499 if (pc
->c
[0] == IDETAPE_WRITE_CMD
) {
1501 (result
->sense_key
== 0xd && result
->asc
== 0x0 &&
1502 result
->ascq
== 0x2)) {
1503 pc
->error
= IDETAPE_ERROR_EOD
;
1504 set_bit(PC_ABORT
, &pc
->flags
);
1507 if (pc
->c
[0] == IDETAPE_READ_CMD
|| pc
->c
[0] == IDETAPE_WRITE_CMD
) {
1508 if (result
->sense_key
== 8) {
1509 pc
->error
= IDETAPE_ERROR_EOD
;
1510 set_bit(PC_ABORT
, &pc
->flags
);
1512 if (!test_bit(PC_ABORT
, &pc
->flags
) &&
1513 pc
->actually_transferred
)
1514 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
1519 * idetape_active_next_stage will declare the next stage as "active".
1521 static void idetape_active_next_stage (ide_drive_t
*drive
)
1523 idetape_tape_t
*tape
= drive
->driver_data
;
1524 idetape_stage_t
*stage
= tape
->next_stage
;
1525 struct request
*rq
= &stage
->rq
;
1527 #if IDETAPE_DEBUG_LOG
1528 if (tape
->debug_level
>= 4)
1529 printk(KERN_INFO
"ide-tape: Reached idetape_active_next_stage\n");
1530 #endif /* IDETAPE_DEBUG_LOG */
1531 #if IDETAPE_DEBUG_BUGS
1532 if (stage
== NULL
) {
1533 printk(KERN_ERR
"ide-tape: bug: Trying to activate a non existing stage\n");
1536 #endif /* IDETAPE_DEBUG_BUGS */
1538 rq
->rq_disk
= tape
->disk
;
1540 rq
->special
= (void *)stage
->bh
;
1541 tape
->active_data_request
= rq
;
1542 tape
->active_stage
= stage
;
1543 tape
->next_stage
= stage
->next
;
1547 * idetape_increase_max_pipeline_stages is a part of the feedback
1548 * loop which tries to find the optimum number of stages. In the
1549 * feedback loop, we are starting from a minimum maximum number of
1550 * stages, and if we sense that the pipeline is empty, we try to
1551 * increase it, until we reach the user compile time memory limit.
1553 static void idetape_increase_max_pipeline_stages (ide_drive_t
*drive
)
1555 idetape_tape_t
*tape
= drive
->driver_data
;
1556 int increase
= (tape
->max_pipeline
- tape
->min_pipeline
) / 10;
1558 #if IDETAPE_DEBUG_LOG
1559 if (tape
->debug_level
>= 4)
1560 printk (KERN_INFO
"ide-tape: Reached idetape_increase_max_pipeline_stages\n");
1561 #endif /* IDETAPE_DEBUG_LOG */
1563 tape
->max_stages
+= max(increase
, 1);
1564 tape
->max_stages
= max(tape
->max_stages
, tape
->min_pipeline
);
1565 tape
->max_stages
= min(tape
->max_stages
, tape
->max_pipeline
);
1569 * idetape_kfree_stage calls kfree to completely free a stage, along with
1570 * its related buffers.
1572 static void __idetape_kfree_stage (idetape_stage_t
*stage
)
1574 struct idetape_bh
*prev_bh
, *bh
= stage
->bh
;
1577 while (bh
!= NULL
) {
1578 if (bh
->b_data
!= NULL
) {
1579 size
= (int) bh
->b_size
;
1581 free_page((unsigned long) bh
->b_data
);
1583 bh
->b_data
+= PAGE_SIZE
;
1593 static void idetape_kfree_stage (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
1595 __idetape_kfree_stage(stage
);
1599 * idetape_remove_stage_head removes tape->first_stage from the pipeline.
1600 * The caller should avoid race conditions.
1602 static void idetape_remove_stage_head (ide_drive_t
*drive
)
1604 idetape_tape_t
*tape
= drive
->driver_data
;
1605 idetape_stage_t
*stage
;
1607 #if IDETAPE_DEBUG_LOG
1608 if (tape
->debug_level
>= 4)
1609 printk(KERN_INFO
"ide-tape: Reached idetape_remove_stage_head\n");
1610 #endif /* IDETAPE_DEBUG_LOG */
1611 #if IDETAPE_DEBUG_BUGS
1612 if (tape
->first_stage
== NULL
) {
1613 printk(KERN_ERR
"ide-tape: bug: tape->first_stage is NULL\n");
1616 if (tape
->active_stage
== tape
->first_stage
) {
1617 printk(KERN_ERR
"ide-tape: bug: Trying to free our active pipeline stage\n");
1620 #endif /* IDETAPE_DEBUG_BUGS */
1621 stage
= tape
->first_stage
;
1622 tape
->first_stage
= stage
->next
;
1623 idetape_kfree_stage(tape
, stage
);
1625 if (tape
->first_stage
== NULL
) {
1626 tape
->last_stage
= NULL
;
1627 #if IDETAPE_DEBUG_BUGS
1628 if (tape
->next_stage
!= NULL
)
1629 printk(KERN_ERR
"ide-tape: bug: tape->next_stage != NULL\n");
1630 if (tape
->nr_stages
)
1631 printk(KERN_ERR
"ide-tape: bug: nr_stages should be 0 now\n");
1632 #endif /* IDETAPE_DEBUG_BUGS */
1637 * This will free all the pipeline stages starting from new_last_stage->next
1638 * to the end of the list, and point tape->last_stage to new_last_stage.
1640 static void idetape_abort_pipeline(ide_drive_t
*drive
,
1641 idetape_stage_t
*new_last_stage
)
1643 idetape_tape_t
*tape
= drive
->driver_data
;
1644 idetape_stage_t
*stage
= new_last_stage
->next
;
1645 idetape_stage_t
*nstage
;
1647 #if IDETAPE_DEBUG_LOG
1648 if (tape
->debug_level
>= 4)
1649 printk(KERN_INFO
"ide-tape: %s: idetape_abort_pipeline called\n", tape
->name
);
1652 nstage
= stage
->next
;
1653 idetape_kfree_stage(tape
, stage
);
1655 --tape
->nr_pending_stages
;
1659 new_last_stage
->next
= NULL
;
1660 tape
->last_stage
= new_last_stage
;
1661 tape
->next_stage
= NULL
;
1665 * idetape_end_request is used to finish servicing a request, and to
1666 * insert a pending pipeline request into the main device queue.
1668 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
1670 struct request
*rq
= HWGROUP(drive
)->rq
;
1671 idetape_tape_t
*tape
= drive
->driver_data
;
1672 unsigned long flags
;
1674 int remove_stage
= 0;
1675 idetape_stage_t
*active_stage
;
1677 #if IDETAPE_DEBUG_LOG
1678 if (tape
->debug_level
>= 4)
1679 printk(KERN_INFO
"ide-tape: Reached idetape_end_request\n");
1680 #endif /* IDETAPE_DEBUG_LOG */
1683 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
1684 case 1: error
= 0; break;
1685 default: error
= uptodate
;
1689 tape
->failed_pc
= NULL
;
1691 if (!blk_special_request(rq
)) {
1692 ide_end_request(drive
, uptodate
, nr_sects
);
1696 spin_lock_irqsave(&tape
->spinlock
, flags
);
1698 /* The request was a pipelined data transfer request */
1699 if (tape
->active_data_request
== rq
) {
1700 active_stage
= tape
->active_stage
;
1701 tape
->active_stage
= NULL
;
1702 tape
->active_data_request
= NULL
;
1703 tape
->nr_pending_stages
--;
1704 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
1707 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1708 if (error
== IDETAPE_ERROR_EOD
)
1709 idetape_abort_pipeline(drive
, active_stage
);
1711 } else if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
1712 if (error
== IDETAPE_ERROR_EOD
) {
1713 set_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
1714 idetape_abort_pipeline(drive
, active_stage
);
1717 if (tape
->next_stage
!= NULL
) {
1718 idetape_active_next_stage(drive
);
1721 * Insert the next request into the request queue.
1723 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
1724 } else if (!error
) {
1725 idetape_increase_max_pipeline_stages(drive
);
1728 ide_end_drive_cmd(drive
, 0, 0);
1729 // blkdev_dequeue_request(rq);
1730 // drive->rq = NULL;
1731 // end_that_request_last(rq);
1734 idetape_remove_stage_head(drive
);
1735 if (tape
->active_data_request
== NULL
)
1736 clear_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
1737 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
1741 static ide_startstop_t
idetape_request_sense_callback (ide_drive_t
*drive
)
1743 idetape_tape_t
*tape
= drive
->driver_data
;
1745 #if IDETAPE_DEBUG_LOG
1746 if (tape
->debug_level
>= 4)
1747 printk(KERN_INFO
"ide-tape: Reached idetape_request_sense_callback\n");
1748 #endif /* IDETAPE_DEBUG_LOG */
1749 if (!tape
->pc
->error
) {
1750 idetape_analyze_error(drive
, (idetape_request_sense_result_t
*) tape
->pc
->buffer
);
1751 idetape_end_request(drive
, 1, 0);
1753 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
1754 idetape_end_request(drive
, 0, 0);
1759 static void idetape_create_request_sense_cmd (idetape_pc_t
*pc
)
1761 idetape_init_pc(pc
);
1762 pc
->c
[0] = IDETAPE_REQUEST_SENSE_CMD
;
1764 pc
->request_transfer
= 20;
1765 pc
->callback
= &idetape_request_sense_callback
;
1768 static void idetape_init_rq(struct request
*rq
, u8 cmd
)
1770 memset(rq
, 0, sizeof(*rq
));
1771 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1776 * idetape_queue_pc_head generates a new packet command request in front
1777 * of the request queue, before the current request, so that it will be
1778 * processed immediately, on the next pass through the driver.
1780 * idetape_queue_pc_head is called from the request handling part of
1781 * the driver (the "bottom" part). Safe storage for the request should
1782 * be allocated with idetape_next_pc_storage and idetape_next_rq_storage
1783 * before calling idetape_queue_pc_head.
1785 * Memory for those requests is pre-allocated at initialization time, and
1786 * is limited to IDETAPE_PC_STACK requests. We assume that we have enough
1787 * space for the maximum possible number of inter-dependent packet commands.
1789 * The higher level of the driver - The ioctl handler and the character
1790 * device handling functions should queue request to the lower level part
1791 * and wait for their completion using idetape_queue_pc_tail or
1792 * idetape_queue_rw_tail.
1794 static void idetape_queue_pc_head (ide_drive_t
*drive
, idetape_pc_t
*pc
,struct request
*rq
)
1796 struct ide_tape_obj
*tape
= drive
->driver_data
;
1798 idetape_init_rq(rq
, REQ_IDETAPE_PC1
);
1799 rq
->buffer
= (char *) pc
;
1800 rq
->rq_disk
= tape
->disk
;
1801 (void) ide_do_drive_cmd(drive
, rq
, ide_preempt
);
1805 * idetape_retry_pc is called when an error was detected during the
1806 * last packet command. We queue a request sense packet command in
1807 * the head of the request list.
1809 static ide_startstop_t
idetape_retry_pc (ide_drive_t
*drive
)
1811 idetape_tape_t
*tape
= drive
->driver_data
;
1815 (void)drive
->hwif
->INB(IDE_ERROR_REG
);
1816 pc
= idetape_next_pc_storage(drive
);
1817 rq
= idetape_next_rq_storage(drive
);
1818 idetape_create_request_sense_cmd(pc
);
1819 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
1820 idetape_queue_pc_head(drive
, pc
, rq
);
1825 * idetape_postpone_request postpones the current request so that
1826 * ide.c will be able to service requests from another device on
1827 * the same hwgroup while we are polling for DSC.
1829 static void idetape_postpone_request (ide_drive_t
*drive
)
1831 idetape_tape_t
*tape
= drive
->driver_data
;
1833 #if IDETAPE_DEBUG_LOG
1834 if (tape
->debug_level
>= 4)
1835 printk(KERN_INFO
"ide-tape: idetape_postpone_request\n");
1837 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
1838 ide_stall_queue(drive
, tape
->dsc_polling_frequency
);
1842 * idetape_pc_intr is the usual interrupt handler which will be called
1843 * during a packet command. We will transfer some of the data (as
1844 * requested by the drive) and will re-point interrupt handler to us.
1845 * When data transfer is finished, we will act according to the
1846 * algorithm described before idetape_issue_packet_command.
1849 static ide_startstop_t
idetape_pc_intr (ide_drive_t
*drive
)
1851 ide_hwif_t
*hwif
= drive
->hwif
;
1852 idetape_tape_t
*tape
= drive
->driver_data
;
1853 idetape_pc_t
*pc
= tape
->pc
;
1856 static int error_sim_count
= 0;
1861 #if IDETAPE_DEBUG_LOG
1862 if (tape
->debug_level
>= 4)
1863 printk(KERN_INFO
"ide-tape: Reached idetape_pc_intr "
1864 "interrupt handler\n");
1865 #endif /* IDETAPE_DEBUG_LOG */
1867 /* Clear the interrupt */
1868 stat
= hwif
->INB(IDE_STATUS_REG
);
1870 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1871 if (hwif
->ide_dma_end(drive
) || (stat
& ERR_STAT
)) {
1873 * A DMA error is sometimes expected. For example,
1874 * if the tape is crossing a filemark during a
1875 * READ command, it will issue an irq and position
1876 * itself before the filemark, so that only a partial
1877 * data transfer will occur (which causes the DMA
1878 * error). In that case, we will later ask the tape
1879 * how much bytes of the original request were
1880 * actually transferred (we can't receive that
1881 * information from the DMA engine on most chipsets).
1885 * On the contrary, a DMA error is never expected;
1886 * it usually indicates a hardware error or abort.
1887 * If the tape crosses a filemark during a READ
1888 * command, it will issue an irq and position itself
1889 * after the filemark (not before). Only a partial
1890 * data transfer will occur, but no DMA error.
1893 set_bit(PC_DMA_ERROR
, &pc
->flags
);
1895 pc
->actually_transferred
= pc
->request_transfer
;
1896 idetape_update_buffers(pc
);
1898 #if IDETAPE_DEBUG_LOG
1899 if (tape
->debug_level
>= 4)
1900 printk(KERN_INFO
"ide-tape: DMA finished\n");
1901 #endif /* IDETAPE_DEBUG_LOG */
1904 /* No more interrupts */
1905 if ((stat
& DRQ_STAT
) == 0) {
1906 #if IDETAPE_DEBUG_LOG
1907 if (tape
->debug_level
>= 2)
1908 printk(KERN_INFO
"ide-tape: Packet command completed, %d bytes transferred\n", pc
->actually_transferred
);
1909 #endif /* IDETAPE_DEBUG_LOG */
1910 clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
1915 if ((pc
->c
[0] == IDETAPE_WRITE_CMD
||
1916 pc
->c
[0] == IDETAPE_READ_CMD
) &&
1917 (++error_sim_count
% 100) == 0) {
1918 printk(KERN_INFO
"ide-tape: %s: simulating error\n",
1923 if ((stat
& ERR_STAT
) && pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
)
1925 if ((stat
& ERR_STAT
) || test_bit(PC_DMA_ERROR
, &pc
->flags
)) {
1926 /* Error detected */
1927 #if IDETAPE_DEBUG_LOG
1928 if (tape
->debug_level
>= 1)
1929 printk(KERN_INFO
"ide-tape: %s: I/O error\n",
1931 #endif /* IDETAPE_DEBUG_LOG */
1932 if (pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
1933 printk(KERN_ERR
"ide-tape: I/O error in request sense command\n");
1934 return ide_do_reset(drive
);
1936 #if IDETAPE_DEBUG_LOG
1937 if (tape
->debug_level
>= 1)
1938 printk(KERN_INFO
"ide-tape: [cmd %x]: check condition\n", pc
->c
[0]);
1940 /* Retry operation */
1941 return idetape_retry_pc(drive
);
1944 if (test_bit(PC_WAIT_FOR_DSC
, &pc
->flags
) &&
1945 (stat
& SEEK_STAT
) == 0) {
1946 /* Media access command */
1947 tape
->dsc_polling_start
= jiffies
;
1948 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_FAST
;
1949 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
1950 /* Allow ide.c to handle other requests */
1951 idetape_postpone_request(drive
);
1954 if (tape
->failed_pc
== pc
)
1955 tape
->failed_pc
= NULL
;
1956 /* Command finished - Call the callback function */
1957 return pc
->callback(drive
);
1959 if (test_and_clear_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
)) {
1960 printk(KERN_ERR
"ide-tape: The tape wants to issue more "
1961 "interrupts in DMA mode\n");
1962 printk(KERN_ERR
"ide-tape: DMA disabled, reverting to PIO\n");
1964 return ide_do_reset(drive
);
1966 /* Get the number of bytes to transfer on this interrupt. */
1967 bcount
= (hwif
->INB(IDE_BCOUNTH_REG
) << 8) |
1968 hwif
->INB(IDE_BCOUNTL_REG
);
1970 ireason
= hwif
->INB(IDE_IREASON_REG
);
1973 printk(KERN_ERR
"ide-tape: CoD != 0 in idetape_pc_intr\n");
1974 return ide_do_reset(drive
);
1976 if (((ireason
& IO
) == IO
) == test_bit(PC_WRITING
, &pc
->flags
)) {
1977 /* Hopefully, we will never get here */
1978 printk(KERN_ERR
"ide-tape: We wanted to %s, ",
1979 (ireason
& IO
) ? "Write" : "Read");
1980 printk(KERN_ERR
"ide-tape: but the tape wants us to %s !\n",
1981 (ireason
& IO
) ? "Read" : "Write");
1982 return ide_do_reset(drive
);
1984 if (!test_bit(PC_WRITING
, &pc
->flags
)) {
1985 /* Reading - Check that we have enough space */
1986 temp
= pc
->actually_transferred
+ bcount
;
1987 if (temp
> pc
->request_transfer
) {
1988 if (temp
> pc
->buffer_size
) {
1989 printk(KERN_ERR
"ide-tape: The tape wants to send us more data than expected - discarding data\n");
1990 idetape_discard_data(drive
, bcount
);
1991 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
1994 #if IDETAPE_DEBUG_LOG
1995 if (tape
->debug_level
>= 2)
1996 printk(KERN_NOTICE
"ide-tape: The tape wants to send us more data than expected - allowing transfer\n");
1997 #endif /* IDETAPE_DEBUG_LOG */
2000 if (test_bit(PC_WRITING
, &pc
->flags
)) {
2002 idetape_output_buffers(drive
, pc
, bcount
);
2004 /* Write the current buffer */
2005 hwif
->atapi_output_bytes(drive
, pc
->current_position
,
2009 idetape_input_buffers(drive
, pc
, bcount
);
2011 /* Read the current buffer */
2012 hwif
->atapi_input_bytes(drive
, pc
->current_position
,
2015 /* Update the current position */
2016 pc
->actually_transferred
+= bcount
;
2017 pc
->current_position
+= bcount
;
2018 #if IDETAPE_DEBUG_LOG
2019 if (tape
->debug_level
>= 2)
2020 printk(KERN_INFO
"ide-tape: [cmd %x] transferred %d bytes "
2021 "on that interrupt\n", pc
->c
[0], bcount
);
2023 /* And set the interrupt handler again */
2024 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
2029 * Packet Command Interface
2031 * The current Packet Command is available in tape->pc, and will not
2032 * change until we finish handling it. Each packet command is associated
2033 * with a callback function that will be called when the command is
2036 * The handling will be done in three stages:
2038 * 1. idetape_issue_packet_command will send the packet command to the
2039 * drive, and will set the interrupt handler to idetape_pc_intr.
2041 * 2. On each interrupt, idetape_pc_intr will be called. This step
2042 * will be repeated until the device signals us that no more
2043 * interrupts will be issued.
2045 * 3. ATAPI Tape media access commands have immediate status with a
2046 * delayed process. In case of a successful initiation of a
2047 * media access packet command, the DSC bit will be set when the
2048 * actual execution of the command is finished.
2049 * Since the tape drive will not issue an interrupt, we have to
2050 * poll for this event. In this case, we define the request as
2051 * "low priority request" by setting rq_status to
2052 * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
2055 * ide.c will then give higher priority to requests which
2056 * originate from the other device, until will change rq_status
2059 * 4. When the packet command is finished, it will be checked for errors.
2061 * 5. In case an error was found, we queue a request sense packet
2062 * command in front of the request queue and retry the operation
2063 * up to IDETAPE_MAX_PC_RETRIES times.
2065 * 6. In case no error was found, or we decided to give up and not
2066 * to retry again, the callback function will be called and then
2067 * we will handle the next request.
2070 static ide_startstop_t
idetape_transfer_pc(ide_drive_t
*drive
)
2072 ide_hwif_t
*hwif
= drive
->hwif
;
2073 idetape_tape_t
*tape
= drive
->driver_data
;
2074 idetape_pc_t
*pc
= tape
->pc
;
2076 ide_startstop_t startstop
;
2079 if (ide_wait_stat(&startstop
,drive
,DRQ_STAT
,BUSY_STAT
,WAIT_READY
)) {
2080 printk(KERN_ERR
"ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
2083 ireason
= hwif
->INB(IDE_IREASON_REG
);
2084 while (retries
-- && ((ireason
& CD
) == 0 || (ireason
& IO
))) {
2085 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while issuing "
2086 "a packet command, retrying\n");
2088 ireason
= hwif
->INB(IDE_IREASON_REG
);
2090 printk(KERN_ERR
"ide-tape: (IO,CoD != (0,1) while "
2091 "issuing a packet command, ignoring\n");
2096 if ((ireason
& CD
) == 0 || (ireason
& IO
)) {
2097 printk(KERN_ERR
"ide-tape: (IO,CoD) != (0,1) while issuing "
2098 "a packet command\n");
2099 return ide_do_reset(drive
);
2101 /* Set the interrupt routine */
2102 ide_set_handler(drive
, &idetape_pc_intr
, IDETAPE_WAIT_CMD
, NULL
);
2103 #ifdef CONFIG_BLK_DEV_IDEDMA
2104 /* Begin DMA, if necessary */
2105 if (test_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
))
2106 hwif
->dma_start(drive
);
2108 /* Send the actual packet */
2109 HWIF(drive
)->atapi_output_bytes(drive
, pc
->c
, 12);
2113 static ide_startstop_t
idetape_issue_packet_command (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2115 ide_hwif_t
*hwif
= drive
->hwif
;
2116 idetape_tape_t
*tape
= drive
->driver_data
;
2120 #if IDETAPE_DEBUG_BUGS
2121 if (tape
->pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
&&
2122 pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
2123 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
2124 "Two request sense in serial were issued\n");
2126 #endif /* IDETAPE_DEBUG_BUGS */
2128 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != IDETAPE_REQUEST_SENSE_CMD
)
2129 tape
->failed_pc
= pc
;
2130 /* Set the current packet command */
2133 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
2134 test_bit(PC_ABORT
, &pc
->flags
)) {
2136 * We will "abort" retrying a packet command in case
2137 * a legitimate error code was received (crossing a
2138 * filemark, or end of the media, for example).
2140 if (!test_bit(PC_ABORT
, &pc
->flags
)) {
2141 if (!(pc
->c
[0] == IDETAPE_TEST_UNIT_READY_CMD
&&
2142 tape
->sense_key
== 2 && tape
->asc
== 4 &&
2143 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
2144 printk(KERN_ERR
"ide-tape: %s: I/O error, "
2145 "pc = %2x, key = %2x, "
2146 "asc = %2x, ascq = %2x\n",
2147 tape
->name
, pc
->c
[0],
2148 tape
->sense_key
, tape
->asc
,
2152 pc
->error
= IDETAPE_ERROR_GENERAL
;
2154 tape
->failed_pc
= NULL
;
2155 return pc
->callback(drive
);
2157 #if IDETAPE_DEBUG_LOG
2158 if (tape
->debug_level
>= 2)
2159 printk(KERN_INFO
"ide-tape: Retry number - %d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
2160 #endif /* IDETAPE_DEBUG_LOG */
2163 /* We haven't transferred any data yet */
2164 pc
->actually_transferred
= 0;
2165 pc
->current_position
= pc
->buffer
;
2166 /* Request to transfer the entire buffer at once */
2167 bcount
= pc
->request_transfer
;
2169 if (test_and_clear_bit(PC_DMA_ERROR
, &pc
->flags
)) {
2170 printk(KERN_WARNING
"ide-tape: DMA disabled, "
2171 "reverting to PIO\n");
2174 if (test_bit(PC_DMA_RECOMMENDED
, &pc
->flags
) && drive
->using_dma
)
2175 dma_ok
= !hwif
->dma_setup(drive
);
2177 ide_pktcmd_tf_load(drive
, IDE_TFLAG_NO_SELECT_MASK
|
2178 IDE_TFLAG_OUT_DEVICE
, bcount
, dma_ok
);
2180 if (dma_ok
) /* Will begin DMA later */
2181 set_bit(PC_DMA_IN_PROGRESS
, &pc
->flags
);
2182 if (test_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
)) {
2183 ide_set_handler(drive
, &idetape_transfer_pc
, IDETAPE_WAIT_CMD
, NULL
);
2184 hwif
->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
2187 hwif
->OUTB(WIN_PACKETCMD
, IDE_COMMAND_REG
);
2188 return idetape_transfer_pc(drive
);
2193 * General packet command callback function.
2195 static ide_startstop_t
idetape_pc_callback (ide_drive_t
*drive
)
2197 idetape_tape_t
*tape
= drive
->driver_data
;
2199 #if IDETAPE_DEBUG_LOG
2200 if (tape
->debug_level
>= 4)
2201 printk(KERN_INFO
"ide-tape: Reached idetape_pc_callback\n");
2202 #endif /* IDETAPE_DEBUG_LOG */
2204 idetape_end_request(drive
, tape
->pc
->error
? 0 : 1, 0);
2209 * A mode sense command is used to "sense" tape parameters.
2211 static void idetape_create_mode_sense_cmd (idetape_pc_t
*pc
, u8 page_code
)
2213 idetape_init_pc(pc
);
2214 pc
->c
[0] = IDETAPE_MODE_SENSE_CMD
;
2215 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
2216 pc
->c
[1] = 8; /* DBD = 1 - Don't return block descriptors */
2217 pc
->c
[2] = page_code
;
2219 * Changed pc->c[3] to 0 (255 will at best return unused info).
2221 * For SCSI this byte is defined as subpage instead of high byte
2222 * of length and some IDE drives seem to interpret it this way
2223 * and return an error when 255 is used.
2226 pc
->c
[4] = 255; /* (We will just discard data in that case) */
2227 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
2228 pc
->request_transfer
= 12;
2229 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
2230 pc
->request_transfer
= 24;
2232 pc
->request_transfer
= 50;
2233 pc
->callback
= &idetape_pc_callback
;
2236 static void calculate_speeds(ide_drive_t
*drive
)
2238 idetape_tape_t
*tape
= drive
->driver_data
;
2239 int full
= 125, empty
= 75;
2241 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 120 * HZ
)) {
2242 tape
->controlled_previous_pipeline_head
= tape
->controlled_last_pipeline_head
;
2243 tape
->controlled_previous_head_time
= tape
->controlled_pipeline_head_time
;
2244 tape
->controlled_last_pipeline_head
= tape
->pipeline_head
;
2245 tape
->controlled_pipeline_head_time
= jiffies
;
2247 if (time_after(jiffies
, tape
->controlled_pipeline_head_time
+ 60 * HZ
))
2248 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_last_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_pipeline_head_time
);
2249 else if (time_after(jiffies
, tape
->controlled_previous_head_time
))
2250 tape
->controlled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->controlled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->controlled_previous_head_time
);
2252 if (tape
->nr_pending_stages
< tape
->max_stages
/*- 1 */) {
2253 /* -1 for read mode error recovery */
2254 if (time_after(jiffies
, tape
->uncontrolled_previous_head_time
+ 10 * HZ
)) {
2255 tape
->uncontrolled_pipeline_head_time
= jiffies
;
2256 tape
->uncontrolled_pipeline_head_speed
= (tape
->pipeline_head
- tape
->uncontrolled_previous_pipeline_head
) * 32 * HZ
/ (jiffies
- tape
->uncontrolled_previous_head_time
);
2259 tape
->uncontrolled_previous_head_time
= jiffies
;
2260 tape
->uncontrolled_previous_pipeline_head
= tape
->pipeline_head
;
2261 if (time_after(jiffies
, tape
->uncontrolled_pipeline_head_time
+ 30 * HZ
)) {
2262 tape
->uncontrolled_pipeline_head_time
= jiffies
;
2265 tape
->pipeline_head_speed
= max(tape
->uncontrolled_pipeline_head_speed
, tape
->controlled_pipeline_head_speed
);
2266 if (tape
->speed_control
== 0) {
2267 tape
->max_insert_speed
= 5000;
2268 } else if (tape
->speed_control
== 1) {
2269 if (tape
->nr_pending_stages
>= tape
->max_stages
/ 2)
2270 tape
->max_insert_speed
= tape
->pipeline_head_speed
+
2271 (1100 - tape
->pipeline_head_speed
) * 2 * (tape
->nr_pending_stages
- tape
->max_stages
/ 2) / tape
->max_stages
;
2273 tape
->max_insert_speed
= 500 +
2274 (tape
->pipeline_head_speed
- 500) * 2 * tape
->nr_pending_stages
/ tape
->max_stages
;
2275 if (tape
->nr_pending_stages
>= tape
->max_stages
* 99 / 100)
2276 tape
->max_insert_speed
= 5000;
2277 } else if (tape
->speed_control
== 2) {
2278 tape
->max_insert_speed
= tape
->pipeline_head_speed
* empty
/ 100 +
2279 (tape
->pipeline_head_speed
* full
/ 100 - tape
->pipeline_head_speed
* empty
/ 100) * tape
->nr_pending_stages
/ tape
->max_stages
;
2281 tape
->max_insert_speed
= tape
->speed_control
;
2282 tape
->max_insert_speed
= max(tape
->max_insert_speed
, 500);
2285 static ide_startstop_t
idetape_media_access_finished (ide_drive_t
*drive
)
2287 idetape_tape_t
*tape
= drive
->driver_data
;
2288 idetape_pc_t
*pc
= tape
->pc
;
2291 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
2292 if (stat
& SEEK_STAT
) {
2293 if (stat
& ERR_STAT
) {
2294 /* Error detected */
2295 if (pc
->c
[0] != IDETAPE_TEST_UNIT_READY_CMD
)
2296 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
2298 /* Retry operation */
2299 return idetape_retry_pc(drive
);
2302 if (tape
->failed_pc
== pc
)
2303 tape
->failed_pc
= NULL
;
2305 pc
->error
= IDETAPE_ERROR_GENERAL
;
2306 tape
->failed_pc
= NULL
;
2308 return pc
->callback(drive
);
2311 static ide_startstop_t
idetape_rw_callback (ide_drive_t
*drive
)
2313 idetape_tape_t
*tape
= drive
->driver_data
;
2314 struct request
*rq
= HWGROUP(drive
)->rq
;
2315 int blocks
= tape
->pc
->actually_transferred
/ tape
->tape_block_size
;
2317 tape
->avg_size
+= blocks
* tape
->tape_block_size
;
2318 tape
->insert_size
+= blocks
* tape
->tape_block_size
;
2319 if (tape
->insert_size
> 1024 * 1024)
2320 tape
->measure_insert_time
= 1;
2321 if (tape
->measure_insert_time
) {
2322 tape
->measure_insert_time
= 0;
2323 tape
->insert_time
= jiffies
;
2324 tape
->insert_size
= 0;
2326 if (time_after(jiffies
, tape
->insert_time
))
2327 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
2328 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
2329 tape
->avg_speed
= tape
->avg_size
* HZ
/ (jiffies
- tape
->avg_time
) / 1024;
2331 tape
->avg_time
= jiffies
;
2334 #if IDETAPE_DEBUG_LOG
2335 if (tape
->debug_level
>= 4)
2336 printk(KERN_INFO
"ide-tape: Reached idetape_rw_callback\n");
2337 #endif /* IDETAPE_DEBUG_LOG */
2339 tape
->first_frame_position
+= blocks
;
2340 rq
->current_nr_sectors
-= blocks
;
2342 if (!tape
->pc
->error
)
2343 idetape_end_request(drive
, 1, 0);
2345 idetape_end_request(drive
, tape
->pc
->error
, 0);
2349 static void idetape_create_read_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
2351 idetape_init_pc(pc
);
2352 pc
->c
[0] = IDETAPE_READ_CMD
;
2353 put_unaligned(htonl(length
), (unsigned int *) &pc
->c
[1]);
2355 pc
->callback
= &idetape_rw_callback
;
2357 atomic_set(&bh
->b_count
, 0);
2359 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
2360 if (pc
->request_transfer
== tape
->stage_size
)
2361 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
2364 static void idetape_create_read_buffer_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
2367 struct idetape_bh
*p
= bh
;
2369 idetape_init_pc(pc
);
2370 pc
->c
[0] = IDETAPE_READ_BUFFER_CMD
;
2371 pc
->c
[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK
;
2372 pc
->c
[7] = size
>> 8;
2373 pc
->c
[8] = size
& 0xff;
2374 pc
->callback
= &idetape_pc_callback
;
2376 atomic_set(&bh
->b_count
, 0);
2379 atomic_set(&p
->b_count
, 0);
2382 pc
->request_transfer
= pc
->buffer_size
= size
;
2385 static void idetape_create_write_cmd(idetape_tape_t
*tape
, idetape_pc_t
*pc
, unsigned int length
, struct idetape_bh
*bh
)
2387 idetape_init_pc(pc
);
2388 pc
->c
[0] = IDETAPE_WRITE_CMD
;
2389 put_unaligned(htonl(length
), (unsigned int *) &pc
->c
[1]);
2391 pc
->callback
= &idetape_rw_callback
;
2392 set_bit(PC_WRITING
, &pc
->flags
);
2394 pc
->b_data
= bh
->b_data
;
2395 pc
->b_count
= atomic_read(&bh
->b_count
);
2397 pc
->request_transfer
= pc
->buffer_size
= length
* tape
->tape_block_size
;
2398 if (pc
->request_transfer
== tape
->stage_size
)
2399 set_bit(PC_DMA_RECOMMENDED
, &pc
->flags
);
2403 * idetape_do_request is our request handling function.
2405 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
2406 struct request
*rq
, sector_t block
)
2408 idetape_tape_t
*tape
= drive
->driver_data
;
2409 idetape_pc_t
*pc
= NULL
;
2410 struct request
*postponed_rq
= tape
->postponed_rq
;
2413 #if IDETAPE_DEBUG_LOG
2415 if (tape
->debug_level
>= 5)
2416 printk(KERN_INFO
"ide-tape: %d, "
2417 "dev: %s, cmd: %ld, errors: %d\n",
2418 rq
->rq_disk
->disk_name
, rq
->cmd
[0], rq
->errors
);
2420 if (tape
->debug_level
>= 2)
2421 printk(KERN_INFO
"ide-tape: sector: %ld, "
2422 "nr_sectors: %ld, current_nr_sectors: %d\n",
2423 rq
->sector
, rq
->nr_sectors
, rq
->current_nr_sectors
);
2424 #endif /* IDETAPE_DEBUG_LOG */
2426 if (!blk_special_request(rq
)) {
2428 * We do not support buffer cache originated requests.
2430 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
2431 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
2432 ide_end_request(drive
, 0, 0);
2437 * Retry a failed packet command
2439 if (tape
->failed_pc
!= NULL
&&
2440 tape
->pc
->c
[0] == IDETAPE_REQUEST_SENSE_CMD
) {
2441 return idetape_issue_packet_command(drive
, tape
->failed_pc
);
2443 #if IDETAPE_DEBUG_BUGS
2444 if (postponed_rq
!= NULL
)
2445 if (rq
!= postponed_rq
) {
2446 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
2447 "Two DSC requests were queued\n");
2448 idetape_end_request(drive
, 0, 0);
2451 #endif /* IDETAPE_DEBUG_BUGS */
2453 tape
->postponed_rq
= NULL
;
2456 * If the tape is still busy, postpone our request and service
2457 * the other device meanwhile.
2459 stat
= drive
->hwif
->INB(IDE_STATUS_REG
);
2461 if (!drive
->dsc_overlap
&& !(rq
->cmd
[0] & REQ_IDETAPE_PC2
))
2462 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
2464 if (drive
->post_reset
== 1) {
2465 set_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
);
2466 drive
->post_reset
= 0;
2469 if (tape
->tape_still_time
> 100 && tape
->tape_still_time
< 200)
2470 tape
->measure_insert_time
= 1;
2471 if (time_after(jiffies
, tape
->insert_time
))
2472 tape
->insert_speed
= tape
->insert_size
/ 1024 * HZ
/ (jiffies
- tape
->insert_time
);
2473 calculate_speeds(drive
);
2474 if (!test_and_clear_bit(IDETAPE_IGNORE_DSC
, &tape
->flags
) &&
2475 (stat
& SEEK_STAT
) == 0) {
2476 if (postponed_rq
== NULL
) {
2477 tape
->dsc_polling_start
= jiffies
;
2478 tape
->dsc_polling_frequency
= tape
->best_dsc_rw_frequency
;
2479 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
2480 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
2481 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
2483 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
2484 idetape_media_access_finished(drive
);
2487 return ide_do_reset(drive
);
2489 } else if (time_after(jiffies
, tape
->dsc_polling_start
+ IDETAPE_DSC_MA_THRESHOLD
))
2490 tape
->dsc_polling_frequency
= IDETAPE_DSC_MA_SLOW
;
2491 idetape_postpone_request(drive
);
2494 if (rq
->cmd
[0] & REQ_IDETAPE_READ
) {
2495 tape
->buffer_head
++;
2496 tape
->postpone_cnt
= 0;
2497 pc
= idetape_next_pc_storage(drive
);
2498 idetape_create_read_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
2501 if (rq
->cmd
[0] & REQ_IDETAPE_WRITE
) {
2502 tape
->buffer_head
++;
2503 tape
->postpone_cnt
= 0;
2504 pc
= idetape_next_pc_storage(drive
);
2505 idetape_create_write_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
2508 if (rq
->cmd
[0] & REQ_IDETAPE_READ_BUFFER
) {
2509 tape
->postpone_cnt
= 0;
2510 pc
= idetape_next_pc_storage(drive
);
2511 idetape_create_read_buffer_cmd(tape
, pc
, rq
->current_nr_sectors
, (struct idetape_bh
*)rq
->special
);
2514 if (rq
->cmd
[0] & REQ_IDETAPE_PC1
) {
2515 pc
= (idetape_pc_t
*) rq
->buffer
;
2516 rq
->cmd
[0] &= ~(REQ_IDETAPE_PC1
);
2517 rq
->cmd
[0] |= REQ_IDETAPE_PC2
;
2520 if (rq
->cmd
[0] & REQ_IDETAPE_PC2
) {
2521 idetape_media_access_finished(drive
);
2526 return idetape_issue_packet_command(drive
, pc
);
2530 * Pipeline related functions
2532 static inline int idetape_pipeline_active (idetape_tape_t
*tape
)
2536 rc1
= test_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
2537 rc2
= (tape
->active_data_request
!= NULL
);
2542 * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
2543 * stage, along with all the necessary small buffers which together make
2544 * a buffer of size tape->stage_size (or a bit more). We attempt to
2545 * combine sequential pages as much as possible.
2547 * Returns a pointer to the new allocated stage, or NULL if we
2548 * can't (or don't want to) allocate a stage.
2550 * Pipeline stages are optional and are used to increase performance.
2551 * If we can't allocate them, we'll manage without them.
2553 static idetape_stage_t
*__idetape_kmalloc_stage (idetape_tape_t
*tape
, int full
, int clear
)
2555 idetape_stage_t
*stage
;
2556 struct idetape_bh
*prev_bh
, *bh
;
2557 int pages
= tape
->pages_per_stage
;
2558 char *b_data
= NULL
;
2560 if ((stage
= kmalloc(sizeof (idetape_stage_t
),GFP_KERNEL
)) == NULL
)
2564 bh
= stage
->bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
2567 bh
->b_reqnext
= NULL
;
2568 if ((bh
->b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
2571 memset(bh
->b_data
, 0, PAGE_SIZE
);
2572 bh
->b_size
= PAGE_SIZE
;
2573 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
2576 if ((b_data
= (char *) __get_free_page (GFP_KERNEL
)) == NULL
)
2579 memset(b_data
, 0, PAGE_SIZE
);
2580 if (bh
->b_data
== b_data
+ PAGE_SIZE
) {
2581 bh
->b_size
+= PAGE_SIZE
;
2582 bh
->b_data
-= PAGE_SIZE
;
2584 atomic_add(PAGE_SIZE
, &bh
->b_count
);
2587 if (b_data
== bh
->b_data
+ bh
->b_size
) {
2588 bh
->b_size
+= PAGE_SIZE
;
2590 atomic_add(PAGE_SIZE
, &bh
->b_count
);
2594 if ((bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
)) == NULL
) {
2595 free_page((unsigned long) b_data
);
2598 bh
->b_reqnext
= NULL
;
2599 bh
->b_data
= b_data
;
2600 bh
->b_size
= PAGE_SIZE
;
2601 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
2602 prev_bh
->b_reqnext
= bh
;
2604 bh
->b_size
-= tape
->excess_bh_size
;
2606 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
2609 __idetape_kfree_stage(stage
);
2613 static idetape_stage_t
*idetape_kmalloc_stage (idetape_tape_t
*tape
)
2615 idetape_stage_t
*cache_stage
= tape
->cache_stage
;
2617 #if IDETAPE_DEBUG_LOG
2618 if (tape
->debug_level
>= 4)
2619 printk(KERN_INFO
"ide-tape: Reached idetape_kmalloc_stage\n");
2620 #endif /* IDETAPE_DEBUG_LOG */
2622 if (tape
->nr_stages
>= tape
->max_stages
)
2624 if (cache_stage
!= NULL
) {
2625 tape
->cache_stage
= NULL
;
2628 return __idetape_kmalloc_stage(tape
, 0, 0);
2631 static int idetape_copy_stage_from_user (idetape_tape_t
*tape
, idetape_stage_t
*stage
, const char __user
*buf
, int n
)
2633 struct idetape_bh
*bh
= tape
->bh
;
2638 #if IDETAPE_DEBUG_BUGS
2640 printk(KERN_ERR
"ide-tape: bh == NULL in "
2641 "idetape_copy_stage_from_user\n");
2644 #endif /* IDETAPE_DEBUG_BUGS */
2645 count
= min((unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)), (unsigned int)n
);
2646 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
, count
))
2649 atomic_add(count
, &bh
->b_count
);
2651 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
2654 atomic_set(&bh
->b_count
, 0);
2661 static int idetape_copy_stage_to_user (idetape_tape_t
*tape
, char __user
*buf
, idetape_stage_t
*stage
, int n
)
2663 struct idetape_bh
*bh
= tape
->bh
;
2668 #if IDETAPE_DEBUG_BUGS
2670 printk(KERN_ERR
"ide-tape: bh == NULL in "
2671 "idetape_copy_stage_to_user\n");
2674 #endif /* IDETAPE_DEBUG_BUGS */
2675 count
= min(tape
->b_count
, n
);
2676 if (copy_to_user(buf
, tape
->b_data
, count
))
2679 tape
->b_data
+= count
;
2680 tape
->b_count
-= count
;
2682 if (!tape
->b_count
) {
2683 tape
->bh
= bh
= bh
->b_reqnext
;
2685 tape
->b_data
= bh
->b_data
;
2686 tape
->b_count
= atomic_read(&bh
->b_count
);
2693 static void idetape_init_merge_stage (idetape_tape_t
*tape
)
2695 struct idetape_bh
*bh
= tape
->merge_stage
->bh
;
2698 if (tape
->chrdev_direction
== idetape_direction_write
)
2699 atomic_set(&bh
->b_count
, 0);
2701 tape
->b_data
= bh
->b_data
;
2702 tape
->b_count
= atomic_read(&bh
->b_count
);
2706 static void idetape_switch_buffers (idetape_tape_t
*tape
, idetape_stage_t
*stage
)
2708 struct idetape_bh
*tmp
;
2711 stage
->bh
= tape
->merge_stage
->bh
;
2712 tape
->merge_stage
->bh
= tmp
;
2713 idetape_init_merge_stage(tape
);
2717 * idetape_add_stage_tail adds a new stage at the end of the pipeline.
2719 static void idetape_add_stage_tail (ide_drive_t
*drive
,idetape_stage_t
*stage
)
2721 idetape_tape_t
*tape
= drive
->driver_data
;
2722 unsigned long flags
;
2724 #if IDETAPE_DEBUG_LOG
2725 if (tape
->debug_level
>= 4)
2726 printk (KERN_INFO
"ide-tape: Reached idetape_add_stage_tail\n");
2727 #endif /* IDETAPE_DEBUG_LOG */
2728 spin_lock_irqsave(&tape
->spinlock
, flags
);
2730 if (tape
->last_stage
!= NULL
)
2731 tape
->last_stage
->next
=stage
;
2733 tape
->first_stage
= tape
->next_stage
=stage
;
2734 tape
->last_stage
= stage
;
2735 if (tape
->next_stage
== NULL
)
2736 tape
->next_stage
= tape
->last_stage
;
2738 tape
->nr_pending_stages
++;
2739 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
2743 * idetape_wait_for_request installs a completion in a pending request
2744 * and sleeps until it is serviced.
2746 * The caller should ensure that the request will not be serviced
2747 * before we install the completion (usually by disabling interrupts).
2749 static void idetape_wait_for_request (ide_drive_t
*drive
, struct request
*rq
)
2751 DECLARE_COMPLETION_ONSTACK(wait
);
2752 idetape_tape_t
*tape
= drive
->driver_data
;
2754 #if IDETAPE_DEBUG_BUGS
2755 if (rq
== NULL
|| !blk_special_request(rq
)) {
2756 printk (KERN_ERR
"ide-tape: bug: Trying to sleep on non-valid request\n");
2759 #endif /* IDETAPE_DEBUG_BUGS */
2760 rq
->end_io_data
= &wait
;
2761 rq
->end_io
= blk_end_sync_rq
;
2762 spin_unlock_irq(&tape
->spinlock
);
2763 wait_for_completion(&wait
);
2764 /* The stage and its struct request have been deallocated */
2765 spin_lock_irq(&tape
->spinlock
);
2768 static ide_startstop_t
idetape_read_position_callback (ide_drive_t
*drive
)
2770 idetape_tape_t
*tape
= drive
->driver_data
;
2771 idetape_read_position_result_t
*result
;
2773 #if IDETAPE_DEBUG_LOG
2774 if (tape
->debug_level
>= 4)
2775 printk(KERN_INFO
"ide-tape: Reached idetape_read_position_callback\n");
2776 #endif /* IDETAPE_DEBUG_LOG */
2778 if (!tape
->pc
->error
) {
2779 result
= (idetape_read_position_result_t
*) tape
->pc
->buffer
;
2780 #if IDETAPE_DEBUG_LOG
2781 if (tape
->debug_level
>= 2)
2782 printk(KERN_INFO
"ide-tape: BOP - %s\n",result
->bop
? "Yes":"No");
2783 if (tape
->debug_level
>= 2)
2784 printk(KERN_INFO
"ide-tape: EOP - %s\n",result
->eop
? "Yes":"No");
2785 #endif /* IDETAPE_DEBUG_LOG */
2787 printk(KERN_INFO
"ide-tape: Block location is unknown to the tape\n");
2788 clear_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2789 idetape_end_request(drive
, 0, 0);
2791 #if IDETAPE_DEBUG_LOG
2792 if (tape
->debug_level
>= 2)
2793 printk(KERN_INFO
"ide-tape: Block Location - %u\n", ntohl(result
->first_block
));
2794 #endif /* IDETAPE_DEBUG_LOG */
2795 tape
->partition
= result
->partition
;
2796 tape
->first_frame_position
= ntohl(result
->first_block
);
2797 tape
->last_frame_position
= ntohl(result
->last_block
);
2798 tape
->blocks_in_buffer
= result
->blocks_in_buffer
[2];
2799 set_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
);
2800 idetape_end_request(drive
, 1, 0);
2803 idetape_end_request(drive
, 0, 0);
2809 * idetape_create_write_filemark_cmd will:
2811 * 1. Write a filemark if write_filemark=1.
2812 * 2. Flush the device buffers without writing a filemark
2813 * if write_filemark=0.
2816 static void idetape_create_write_filemark_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int write_filemark
)
2818 idetape_init_pc(pc
);
2819 pc
->c
[0] = IDETAPE_WRITE_FILEMARK_CMD
;
2820 pc
->c
[4] = write_filemark
;
2821 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2822 pc
->callback
= &idetape_pc_callback
;
2825 static void idetape_create_test_unit_ready_cmd(idetape_pc_t
*pc
)
2827 idetape_init_pc(pc
);
2828 pc
->c
[0] = IDETAPE_TEST_UNIT_READY_CMD
;
2829 pc
->callback
= &idetape_pc_callback
;
2833 * idetape_queue_pc_tail is based on the following functions:
2835 * ide_do_drive_cmd from ide.c
2836 * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
2838 * We add a special packet command request to the tail of the request
2839 * queue, and wait for it to be serviced.
2841 * This is not to be called from within the request handling part
2842 * of the driver ! We allocate here data in the stack, and it is valid
2843 * until the request is finished. This is not the case for the bottom
2844 * part of the driver, where we are always leaving the functions to wait
2845 * for an interrupt or a timer event.
2847 * From the bottom part of the driver, we should allocate safe memory
2848 * using idetape_next_pc_storage and idetape_next_rq_storage, and add
2849 * the request to the request list without waiting for it to be serviced !
2850 * In that case, we usually use idetape_queue_pc_head.
2852 static int __idetape_queue_pc_tail (ide_drive_t
*drive
, idetape_pc_t
*pc
)
2854 struct ide_tape_obj
*tape
= drive
->driver_data
;
2857 idetape_init_rq(&rq
, REQ_IDETAPE_PC1
);
2858 rq
.buffer
= (char *) pc
;
2859 rq
.rq_disk
= tape
->disk
;
2860 return ide_do_drive_cmd(drive
, &rq
, ide_wait
);
2863 static void idetape_create_load_unload_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
,int cmd
)
2865 idetape_init_pc(pc
);
2866 pc
->c
[0] = IDETAPE_LOAD_UNLOAD_CMD
;
2868 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2869 pc
->callback
= &idetape_pc_callback
;
2872 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
2874 idetape_tape_t
*tape
= drive
->driver_data
;
2876 int load_attempted
= 0;
2879 * Wait for the tape to become ready
2881 set_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
2883 while (time_before(jiffies
, timeout
)) {
2884 idetape_create_test_unit_ready_cmd(&pc
);
2885 if (!__idetape_queue_pc_tail(drive
, &pc
))
2887 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
2888 || (tape
->asc
== 0x3A)) { /* no media */
2891 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
2892 __idetape_queue_pc_tail(drive
, &pc
);
2894 /* not about to be ready */
2895 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
2896 (tape
->ascq
== 1 || tape
->ascq
== 8)))
2903 static int idetape_queue_pc_tail (ide_drive_t
*drive
,idetape_pc_t
*pc
)
2905 return __idetape_queue_pc_tail(drive
, pc
);
2908 static int idetape_flush_tape_buffers (ide_drive_t
*drive
)
2913 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
2914 if ((rc
= idetape_queue_pc_tail(drive
, &pc
)))
2916 idetape_wait_ready(drive
, 60 * 5 * HZ
);
2920 static void idetape_create_read_position_cmd (idetape_pc_t
*pc
)
2922 idetape_init_pc(pc
);
2923 pc
->c
[0] = IDETAPE_READ_POSITION_CMD
;
2924 pc
->request_transfer
= 20;
2925 pc
->callback
= &idetape_read_position_callback
;
2928 static int idetape_read_position (ide_drive_t
*drive
)
2930 idetape_tape_t
*tape
= drive
->driver_data
;
2934 #if IDETAPE_DEBUG_LOG
2935 if (tape
->debug_level
>= 4)
2936 printk(KERN_INFO
"ide-tape: Reached idetape_read_position\n");
2937 #endif /* IDETAPE_DEBUG_LOG */
2939 idetape_create_read_position_cmd(&pc
);
2940 if (idetape_queue_pc_tail(drive
, &pc
))
2942 position
= tape
->first_frame_position
;
2946 static void idetape_create_locate_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, unsigned int block
, u8 partition
, int skip
)
2948 idetape_init_pc(pc
);
2949 pc
->c
[0] = IDETAPE_LOCATE_CMD
;
2951 put_unaligned(htonl(block
), (unsigned int *) &pc
->c
[3]);
2952 pc
->c
[8] = partition
;
2953 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
2954 pc
->callback
= &idetape_pc_callback
;
2957 static int idetape_create_prevent_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
, int prevent
)
2959 idetape_tape_t
*tape
= drive
->driver_data
;
2961 if (!tape
->capabilities
.lock
)
2964 idetape_init_pc(pc
);
2965 pc
->c
[0] = IDETAPE_PREVENT_CMD
;
2967 pc
->callback
= &idetape_pc_callback
;
2971 static int __idetape_discard_read_pipeline (ide_drive_t
*drive
)
2973 idetape_tape_t
*tape
= drive
->driver_data
;
2974 unsigned long flags
;
2977 if (tape
->chrdev_direction
!= idetape_direction_read
)
2980 /* Remove merge stage. */
2981 cnt
= tape
->merge_stage_size
/ tape
->tape_block_size
;
2982 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
2983 ++cnt
; /* Filemarks count as 1 sector */
2984 tape
->merge_stage_size
= 0;
2985 if (tape
->merge_stage
!= NULL
) {
2986 __idetape_kfree_stage(tape
->merge_stage
);
2987 tape
->merge_stage
= NULL
;
2990 /* Clear pipeline flags. */
2991 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
2992 tape
->chrdev_direction
= idetape_direction_none
;
2994 /* Remove pipeline stages. */
2995 if (tape
->first_stage
== NULL
)
2998 spin_lock_irqsave(&tape
->spinlock
, flags
);
2999 tape
->next_stage
= NULL
;
3000 if (idetape_pipeline_active(tape
))
3001 idetape_wait_for_request(drive
, tape
->active_data_request
);
3002 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3004 while (tape
->first_stage
!= NULL
) {
3005 struct request
*rq_ptr
= &tape
->first_stage
->rq
;
3007 cnt
+= rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
;
3008 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
3010 idetape_remove_stage_head(drive
);
3012 tape
->nr_pending_stages
= 0;
3013 tape
->max_stages
= tape
->min_pipeline
;
3018 * idetape_position_tape positions the tape to the requested block
3019 * using the LOCATE packet command. A READ POSITION command is then
3020 * issued to check where we are positioned.
3022 * Like all higher level operations, we queue the commands at the tail
3023 * of the request queue and wait for their completion.
3026 static int idetape_position_tape (ide_drive_t
*drive
, unsigned int block
, u8 partition
, int skip
)
3028 idetape_tape_t
*tape
= drive
->driver_data
;
3032 if (tape
->chrdev_direction
== idetape_direction_read
)
3033 __idetape_discard_read_pipeline(drive
);
3034 idetape_wait_ready(drive
, 60 * 5 * HZ
);
3035 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
3036 retval
= idetape_queue_pc_tail(drive
, &pc
);
3040 idetape_create_read_position_cmd(&pc
);
3041 return (idetape_queue_pc_tail(drive
, &pc
));
3044 static void idetape_discard_read_pipeline (ide_drive_t
*drive
, int restore_position
)
3046 idetape_tape_t
*tape
= drive
->driver_data
;
3050 cnt
= __idetape_discard_read_pipeline(drive
);
3051 if (restore_position
) {
3052 position
= idetape_read_position(drive
);
3053 seek
= position
> cnt
? position
- cnt
: 0;
3054 if (idetape_position_tape(drive
, seek
, 0, 0)) {
3055 printk(KERN_INFO
"ide-tape: %s: position_tape failed in discard_pipeline()\n", tape
->name
);
3062 * idetape_queue_rw_tail generates a read/write request for the block
3063 * device interface and wait for it to be serviced.
3065 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
, struct idetape_bh
*bh
)
3067 idetape_tape_t
*tape
= drive
->driver_data
;
3070 #if IDETAPE_DEBUG_LOG
3071 if (tape
->debug_level
>= 2)
3072 printk(KERN_INFO
"ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd
);
3073 #endif /* IDETAPE_DEBUG_LOG */
3074 #if IDETAPE_DEBUG_BUGS
3075 if (idetape_pipeline_active(tape
)) {
3076 printk(KERN_ERR
"ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n");
3079 #endif /* IDETAPE_DEBUG_BUGS */
3081 idetape_init_rq(&rq
, cmd
);
3082 rq
.rq_disk
= tape
->disk
;
3083 rq
.special
= (void *)bh
;
3084 rq
.sector
= tape
->first_frame_position
;
3085 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
3086 (void) ide_do_drive_cmd(drive
, &rq
, ide_wait
);
3088 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
3091 if (tape
->merge_stage
)
3092 idetape_init_merge_stage(tape
);
3093 if (rq
.errors
== IDETAPE_ERROR_GENERAL
)
3095 return (tape
->tape_block_size
* (blocks
-rq
.current_nr_sectors
));
3099 * idetape_insert_pipeline_into_queue is used to start servicing the
3100 * pipeline stages, starting from tape->next_stage.
3102 static void idetape_insert_pipeline_into_queue (ide_drive_t
*drive
)
3104 idetape_tape_t
*tape
= drive
->driver_data
;
3106 if (tape
->next_stage
== NULL
)
3108 if (!idetape_pipeline_active(tape
)) {
3109 set_bit(IDETAPE_PIPELINE_ACTIVE
, &tape
->flags
);
3110 idetape_active_next_stage(drive
);
3111 (void) ide_do_drive_cmd(drive
, tape
->active_data_request
, ide_end
);
3115 static void idetape_create_inquiry_cmd (idetape_pc_t
*pc
)
3117 idetape_init_pc(pc
);
3118 pc
->c
[0] = IDETAPE_INQUIRY_CMD
;
3119 pc
->c
[4] = pc
->request_transfer
= 254;
3120 pc
->callback
= &idetape_pc_callback
;
3123 static void idetape_create_rewind_cmd (ide_drive_t
*drive
, idetape_pc_t
*pc
)
3125 idetape_init_pc(pc
);
3126 pc
->c
[0] = IDETAPE_REWIND_CMD
;
3127 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
3128 pc
->callback
= &idetape_pc_callback
;
3132 static void idetape_create_mode_select_cmd (idetape_pc_t
*pc
, int length
)
3134 idetape_init_pc(pc
);
3135 set_bit(PC_WRITING
, &pc
->flags
);
3136 pc
->c
[0] = IDETAPE_MODE_SELECT_CMD
;
3138 put_unaligned(htons(length
), (unsigned short *) &pc
->c
[3]);
3139 pc
->request_transfer
= 255;
3140 pc
->callback
= &idetape_pc_callback
;
3144 static void idetape_create_erase_cmd (idetape_pc_t
*pc
)
3146 idetape_init_pc(pc
);
3147 pc
->c
[0] = IDETAPE_ERASE_CMD
;
3149 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
3150 pc
->callback
= &idetape_pc_callback
;
3153 static void idetape_create_space_cmd (idetape_pc_t
*pc
,int count
, u8 cmd
)
3155 idetape_init_pc(pc
);
3156 pc
->c
[0] = IDETAPE_SPACE_CMD
;
3157 put_unaligned(htonl(count
), (unsigned int *) &pc
->c
[1]);
3159 set_bit(PC_WAIT_FOR_DSC
, &pc
->flags
);
3160 pc
->callback
= &idetape_pc_callback
;
3163 static void idetape_wait_first_stage (ide_drive_t
*drive
)
3165 idetape_tape_t
*tape
= drive
->driver_data
;
3166 unsigned long flags
;
3168 if (tape
->first_stage
== NULL
)
3170 spin_lock_irqsave(&tape
->spinlock
, flags
);
3171 if (tape
->active_stage
== tape
->first_stage
)
3172 idetape_wait_for_request(drive
, tape
->active_data_request
);
3173 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3177 * idetape_add_chrdev_write_request tries to add a character device
3178 * originated write request to our pipeline. In case we don't succeed,
3179 * we revert to non-pipelined operation mode for this request.
3181 * 1. Try to allocate a new pipeline stage.
3182 * 2. If we can't, wait for more and more requests to be serviced
3183 * and try again each time.
3184 * 3. If we still can't allocate a stage, fallback to
3185 * non-pipelined operation mode for this request.
3187 static int idetape_add_chrdev_write_request (ide_drive_t
*drive
, int blocks
)
3189 idetape_tape_t
*tape
= drive
->driver_data
;
3190 idetape_stage_t
*new_stage
;
3191 unsigned long flags
;
3194 #if IDETAPE_DEBUG_LOG
3195 if (tape
->debug_level
>= 3)
3196 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_write_request\n");
3197 #endif /* IDETAPE_DEBUG_LOG */
3200 * Attempt to allocate a new stage.
3201 * Pay special attention to possible race conditions.
3203 while ((new_stage
= idetape_kmalloc_stage(tape
)) == NULL
) {
3204 spin_lock_irqsave(&tape
->spinlock
, flags
);
3205 if (idetape_pipeline_active(tape
)) {
3206 idetape_wait_for_request(drive
, tape
->active_data_request
);
3207 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3209 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3210 idetape_insert_pipeline_into_queue(drive
);
3211 if (idetape_pipeline_active(tape
))
3214 * Linux is short on memory. Fallback to
3215 * non-pipelined operation mode for this request.
3217 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
3220 rq
= &new_stage
->rq
;
3221 idetape_init_rq(rq
, REQ_IDETAPE_WRITE
);
3222 /* Doesn't actually matter - We always assume sequential access */
3223 rq
->sector
= tape
->first_frame_position
;
3224 rq
->nr_sectors
= rq
->current_nr_sectors
= blocks
;
3226 idetape_switch_buffers(tape
, new_stage
);
3227 idetape_add_stage_tail(drive
, new_stage
);
3228 tape
->pipeline_head
++;
3229 calculate_speeds(drive
);
3232 * Estimate whether the tape has stopped writing by checking
3233 * if our write pipeline is currently empty. If we are not
3234 * writing anymore, wait for the pipeline to be full enough
3235 * (90%) before starting to service requests, so that we will
3236 * be able to keep up with the higher speeds of the tape.
3238 if (!idetape_pipeline_active(tape
)) {
3239 if (tape
->nr_stages
>= tape
->max_stages
* 9 / 10 ||
3240 tape
->nr_stages
>= tape
->max_stages
- tape
->uncontrolled_pipeline_head_speed
* 3 * 1024 / tape
->tape_block_size
) {
3241 tape
->measure_insert_time
= 1;
3242 tape
->insert_time
= jiffies
;
3243 tape
->insert_size
= 0;
3244 tape
->insert_speed
= 0;
3245 idetape_insert_pipeline_into_queue(drive
);
3248 if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
3249 /* Return a deferred error */
3255 * idetape_wait_for_pipeline will wait until all pending pipeline
3256 * requests are serviced. Typically called on device close.
3258 static void idetape_wait_for_pipeline (ide_drive_t
*drive
)
3260 idetape_tape_t
*tape
= drive
->driver_data
;
3261 unsigned long flags
;
3263 while (tape
->next_stage
|| idetape_pipeline_active(tape
)) {
3264 idetape_insert_pipeline_into_queue(drive
);
3265 spin_lock_irqsave(&tape
->spinlock
, flags
);
3266 if (idetape_pipeline_active(tape
))
3267 idetape_wait_for_request(drive
, tape
->active_data_request
);
3268 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3272 static void idetape_empty_write_pipeline (ide_drive_t
*drive
)
3274 idetape_tape_t
*tape
= drive
->driver_data
;
3276 struct idetape_bh
*bh
;
3278 #if IDETAPE_DEBUG_BUGS
3279 if (tape
->chrdev_direction
!= idetape_direction_write
) {
3280 printk(KERN_ERR
"ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
3283 if (tape
->merge_stage_size
> tape
->stage_size
) {
3284 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
3285 tape
->merge_stage_size
= tape
->stage_size
;
3287 #endif /* IDETAPE_DEBUG_BUGS */
3288 if (tape
->merge_stage_size
) {
3289 blocks
= tape
->merge_stage_size
/ tape
->tape_block_size
;
3290 if (tape
->merge_stage_size
% tape
->tape_block_size
) {
3294 i
= tape
->tape_block_size
- tape
->merge_stage_size
% tape
->tape_block_size
;
3295 bh
= tape
->bh
->b_reqnext
;
3297 atomic_set(&bh
->b_count
, 0);
3304 printk(KERN_INFO
"ide-tape: bug, bh NULL\n");
3307 min
= min(i
, (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)));
3308 memset(bh
->b_data
+ atomic_read(&bh
->b_count
), 0, min
);
3309 atomic_add(min
, &bh
->b_count
);
3314 (void) idetape_add_chrdev_write_request(drive
, blocks
);
3315 tape
->merge_stage_size
= 0;
3317 idetape_wait_for_pipeline(drive
);
3318 if (tape
->merge_stage
!= NULL
) {
3319 __idetape_kfree_stage(tape
->merge_stage
);
3320 tape
->merge_stage
= NULL
;
3322 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
3323 tape
->chrdev_direction
= idetape_direction_none
;
3326 * On the next backup, perform the feedback loop again.
3327 * (I don't want to keep sense information between backups,
3328 * as some systems are constantly on, and the system load
3329 * can be totally different on the next backup).
3331 tape
->max_stages
= tape
->min_pipeline
;
3332 #if IDETAPE_DEBUG_BUGS
3333 if (tape
->first_stage
!= NULL
||
3334 tape
->next_stage
!= NULL
||
3335 tape
->last_stage
!= NULL
||
3336 tape
->nr_stages
!= 0) {
3337 printk(KERN_ERR
"ide-tape: ide-tape pipeline bug, "
3338 "first_stage %p, next_stage %p, "
3339 "last_stage %p, nr_stages %d\n",
3340 tape
->first_stage
, tape
->next_stage
,
3341 tape
->last_stage
, tape
->nr_stages
);
3343 #endif /* IDETAPE_DEBUG_BUGS */
3346 static void idetape_restart_speed_control (ide_drive_t
*drive
)
3348 idetape_tape_t
*tape
= drive
->driver_data
;
3350 tape
->restart_speed_control_req
= 0;
3351 tape
->pipeline_head
= 0;
3352 tape
->controlled_last_pipeline_head
= tape
->uncontrolled_last_pipeline_head
= 0;
3353 tape
->controlled_previous_pipeline_head
= tape
->uncontrolled_previous_pipeline_head
= 0;
3354 tape
->pipeline_head_speed
= tape
->controlled_pipeline_head_speed
= 5000;
3355 tape
->uncontrolled_pipeline_head_speed
= 0;
3356 tape
->controlled_pipeline_head_time
= tape
->uncontrolled_pipeline_head_time
= jiffies
;
3357 tape
->controlled_previous_head_time
= tape
->uncontrolled_previous_head_time
= jiffies
;
3360 static int idetape_initiate_read (ide_drive_t
*drive
, int max_stages
)
3362 idetape_tape_t
*tape
= drive
->driver_data
;
3363 idetape_stage_t
*new_stage
;
3366 int blocks
= tape
->capabilities
.ctl
;
3368 /* Initialize read operation */
3369 if (tape
->chrdev_direction
!= idetape_direction_read
) {
3370 if (tape
->chrdev_direction
== idetape_direction_write
) {
3371 idetape_empty_write_pipeline(drive
);
3372 idetape_flush_tape_buffers(drive
);
3374 #if IDETAPE_DEBUG_BUGS
3375 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
3376 printk (KERN_ERR
"ide-tape: merge_stage_size should be 0 now\n");
3377 tape
->merge_stage_size
= 0;
3379 #endif /* IDETAPE_DEBUG_BUGS */
3380 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
3382 tape
->chrdev_direction
= idetape_direction_read
;
3385 * Issue a read 0 command to ensure that DSC handshake
3386 * is switched from completion mode to buffer available
3388 * No point in issuing this if DSC overlap isn't supported,
3389 * some drives (Seagate STT3401A) will return an error.
3391 if (drive
->dsc_overlap
) {
3392 bytes_read
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, 0, tape
->merge_stage
->bh
);
3393 if (bytes_read
< 0) {
3394 __idetape_kfree_stage(tape
->merge_stage
);
3395 tape
->merge_stage
= NULL
;
3396 tape
->chrdev_direction
= idetape_direction_none
;
3401 if (tape
->restart_speed_control_req
)
3402 idetape_restart_speed_control(drive
);
3403 idetape_init_rq(&rq
, REQ_IDETAPE_READ
);
3404 rq
.sector
= tape
->first_frame_position
;
3405 rq
.nr_sectors
= rq
.current_nr_sectors
= blocks
;
3406 if (!test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
) &&
3407 tape
->nr_stages
< max_stages
) {
3408 new_stage
= idetape_kmalloc_stage(tape
);
3409 while (new_stage
!= NULL
) {
3411 idetape_add_stage_tail(drive
, new_stage
);
3412 if (tape
->nr_stages
>= max_stages
)
3414 new_stage
= idetape_kmalloc_stage(tape
);
3417 if (!idetape_pipeline_active(tape
)) {
3418 if (tape
->nr_pending_stages
>= 3 * max_stages
/ 4) {
3419 tape
->measure_insert_time
= 1;
3420 tape
->insert_time
= jiffies
;
3421 tape
->insert_size
= 0;
3422 tape
->insert_speed
= 0;
3423 idetape_insert_pipeline_into_queue(drive
);
3430 * idetape_add_chrdev_read_request is called from idetape_chrdev_read
3431 * to service a character device read request and add read-ahead
3432 * requests to our pipeline.
3434 static int idetape_add_chrdev_read_request (ide_drive_t
*drive
,int blocks
)
3436 idetape_tape_t
*tape
= drive
->driver_data
;
3437 unsigned long flags
;
3438 struct request
*rq_ptr
;
3441 #if IDETAPE_DEBUG_LOG
3442 if (tape
->debug_level
>= 4)
3443 printk(KERN_INFO
"ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks
);
3444 #endif /* IDETAPE_DEBUG_LOG */
3447 * If we are at a filemark, return a read length of 0
3449 if (test_bit(IDETAPE_FILEMARK
, &tape
->flags
))
3453 * Wait for the next block to be available at the head
3456 idetape_initiate_read(drive
, tape
->max_stages
);
3457 if (tape
->first_stage
== NULL
) {
3458 if (test_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
))
3460 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
, tape
->merge_stage
->bh
);
3462 idetape_wait_first_stage(drive
);
3463 rq_ptr
= &tape
->first_stage
->rq
;
3464 bytes_read
= tape
->tape_block_size
* (rq_ptr
->nr_sectors
- rq_ptr
->current_nr_sectors
);
3465 rq_ptr
->nr_sectors
= rq_ptr
->current_nr_sectors
= 0;
3468 if (rq_ptr
->errors
== IDETAPE_ERROR_EOD
)
3471 idetape_switch_buffers(tape
, tape
->first_stage
);
3472 if (rq_ptr
->errors
== IDETAPE_ERROR_FILEMARK
)
3473 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
3474 spin_lock_irqsave(&tape
->spinlock
, flags
);
3475 idetape_remove_stage_head(drive
);
3476 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3477 tape
->pipeline_head
++;
3478 calculate_speeds(drive
);
3480 #if IDETAPE_DEBUG_BUGS
3481 if (bytes_read
> blocks
* tape
->tape_block_size
) {
3482 printk(KERN_ERR
"ide-tape: bug: trying to return more bytes than requested\n");
3483 bytes_read
= blocks
* tape
->tape_block_size
;
3485 #endif /* IDETAPE_DEBUG_BUGS */
3486 return (bytes_read
);
3489 static void idetape_pad_zeros (ide_drive_t
*drive
, int bcount
)
3491 idetape_tape_t
*tape
= drive
->driver_data
;
3492 struct idetape_bh
*bh
;
3498 bh
= tape
->merge_stage
->bh
;
3499 count
= min(tape
->stage_size
, bcount
);
3501 blocks
= count
/ tape
->tape_block_size
;
3503 atomic_set(&bh
->b_count
, min(count
, (unsigned int)bh
->b_size
));
3504 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
3505 count
-= atomic_read(&bh
->b_count
);
3508 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
, tape
->merge_stage
->bh
);
3512 static int idetape_pipeline_size (ide_drive_t
*drive
)
3514 idetape_tape_t
*tape
= drive
->driver_data
;
3515 idetape_stage_t
*stage
;
3519 idetape_wait_for_pipeline(drive
);
3520 stage
= tape
->first_stage
;
3521 while (stage
!= NULL
) {
3523 size
+= tape
->tape_block_size
* (rq
->nr_sectors
-rq
->current_nr_sectors
);
3524 if (rq
->errors
== IDETAPE_ERROR_FILEMARK
)
3525 size
+= tape
->tape_block_size
;
3526 stage
= stage
->next
;
3528 size
+= tape
->merge_stage_size
;
3533 * Rewinds the tape to the Beginning Of the current Partition (BOP).
3535 * We currently support only one partition.
3537 static int idetape_rewind_tape (ide_drive_t
*drive
)
3541 #if IDETAPE_DEBUG_LOG
3542 idetape_tape_t
*tape
= drive
->driver_data
;
3543 if (tape
->debug_level
>= 2)
3544 printk(KERN_INFO
"ide-tape: Reached idetape_rewind_tape\n");
3545 #endif /* IDETAPE_DEBUG_LOG */
3547 idetape_create_rewind_cmd(drive
, &pc
);
3548 retval
= idetape_queue_pc_tail(drive
, &pc
);
3552 idetape_create_read_position_cmd(&pc
);
3553 retval
= idetape_queue_pc_tail(drive
, &pc
);
3560 * Our special ide-tape ioctl's.
3562 * Currently there aren't any ioctl's.
3563 * mtio.h compatible commands should be issued to the character device
3566 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
, unsigned long arg
)
3568 idetape_tape_t
*tape
= drive
->driver_data
;
3569 idetape_config_t config
;
3570 void __user
*argp
= (void __user
*)arg
;
3572 #if IDETAPE_DEBUG_LOG
3573 if (tape
->debug_level
>= 4)
3574 printk(KERN_INFO
"ide-tape: Reached idetape_blkdev_ioctl\n");
3575 #endif /* IDETAPE_DEBUG_LOG */
3578 if (copy_from_user(&config
, argp
, sizeof (idetape_config_t
)))
3580 tape
->best_dsc_rw_frequency
= config
.dsc_rw_frequency
;
3581 tape
->max_stages
= config
.nr_stages
;
3584 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_frequency
;
3585 config
.nr_stages
= tape
->max_stages
;
3586 if (copy_to_user(argp
, &config
, sizeof (idetape_config_t
)))
3596 * idetape_space_over_filemarks is now a bit more complicated than just
3597 * passing the command to the tape since we may have crossed some
3598 * filemarks during our pipelined read-ahead mode.
3600 * As a minor side effect, the pipeline enables us to support MTFSFM when
3601 * the filemark is in our internal pipeline even if the tape doesn't
3602 * support spacing over filemarks in the reverse direction.
3604 static int idetape_space_over_filemarks (ide_drive_t
*drive
,short mt_op
,int mt_count
)
3606 idetape_tape_t
*tape
= drive
->driver_data
;
3608 unsigned long flags
;
3613 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
3614 if (!tape
->capabilities
.sprev
)
3616 mt_count
= - mt_count
;
3619 if (tape
->chrdev_direction
== idetape_direction_read
) {
3621 * We have a read-ahead buffer. Scan it for crossed
3624 tape
->merge_stage_size
= 0;
3625 if (test_and_clear_bit(IDETAPE_FILEMARK
, &tape
->flags
))
3627 while (tape
->first_stage
!= NULL
) {
3628 if (count
== mt_count
) {
3629 if (mt_op
== MTFSFM
)
3630 set_bit(IDETAPE_FILEMARK
, &tape
->flags
);
3633 spin_lock_irqsave(&tape
->spinlock
, flags
);
3634 if (tape
->first_stage
== tape
->active_stage
) {
3636 * We have reached the active stage in the read pipeline.
3637 * There is no point in allowing the drive to continue
3638 * reading any farther, so we stop the pipeline.
3640 * This section should be moved to a separate subroutine,
3641 * because a similar function is performed in
3642 * __idetape_discard_read_pipeline(), for example.
3644 tape
->next_stage
= NULL
;
3645 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3646 idetape_wait_first_stage(drive
);
3647 tape
->next_stage
= tape
->first_stage
->next
;
3649 spin_unlock_irqrestore(&tape
->spinlock
, flags
);
3650 if (tape
->first_stage
->rq
.errors
== IDETAPE_ERROR_FILEMARK
)
3652 idetape_remove_stage_head(drive
);
3654 idetape_discard_read_pipeline(drive
, 0);
3658 * The filemark was not found in our internal pipeline.
3659 * Now we can issue the space command.
3664 idetape_create_space_cmd(&pc
,mt_count
-count
,IDETAPE_SPACE_OVER_FILEMARK
);
3665 return (idetape_queue_pc_tail(drive
, &pc
));
3668 if (!tape
->capabilities
.sprev
)
3670 retval
= idetape_space_over_filemarks(drive
, MTFSF
, mt_count
-count
);
3671 if (retval
) return (retval
);
3672 count
= (MTBSFM
== mt_op
? 1 : -1);
3673 return (idetape_space_over_filemarks(drive
, MTFSF
, count
));
3675 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",mt_op
);
3682 * Our character device read / write functions.
3684 * The tape is optimized to maximize throughput when it is transferring
3685 * an integral number of the "continuous transfer limit", which is
3686 * a parameter of the specific tape (26 KB on my particular tape).
3687 * (32 kB for Onstream)
3689 * As of version 1.3 of the driver, the character device provides an
3690 * abstract continuous view of the media - any mix of block sizes (even 1
3691 * byte) on the same backup/restore procedure is supported. The driver
3692 * will internally convert the requests to the recommended transfer unit,
3693 * so that an unmatch between the user's block size to the recommended
3694 * size will only result in a (slightly) increased driver overhead, but
3695 * will no longer hit performance.
3696 * This is not applicable to Onstream.
3698 static ssize_t
idetape_chrdev_read (struct file
*file
, char __user
*buf
,
3699 size_t count
, loff_t
*ppos
)
3701 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3702 ide_drive_t
*drive
= tape
->drive
;
3703 ssize_t bytes_read
,temp
, actually_read
= 0, rc
;
3706 #if IDETAPE_DEBUG_LOG
3707 if (tape
->debug_level
>= 3)
3708 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_read, count %Zd\n", count
);
3709 #endif /* IDETAPE_DEBUG_LOG */
3711 if (tape
->chrdev_direction
!= idetape_direction_read
) {
3712 if (test_bit(IDETAPE_DETECT_BS
, &tape
->flags
))
3713 if (count
> tape
->tape_block_size
&&
3714 (count
% tape
->tape_block_size
) == 0)
3715 tape
->user_bs_factor
= count
/ tape
->tape_block_size
;
3717 if ((rc
= idetape_initiate_read(drive
, tape
->max_stages
)) < 0)
3721 if (tape
->merge_stage_size
) {
3722 actually_read
= min((unsigned int)(tape
->merge_stage_size
), (unsigned int)count
);
3723 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, actually_read
))
3725 buf
+= actually_read
;
3726 tape
->merge_stage_size
-= actually_read
;
3727 count
-= actually_read
;
3729 while (count
>= tape
->stage_size
) {
3730 bytes_read
= idetape_add_chrdev_read_request(drive
, tape
->capabilities
.ctl
);
3731 if (bytes_read
<= 0)
3733 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, bytes_read
))
3736 count
-= bytes_read
;
3737 actually_read
+= bytes_read
;
3740 bytes_read
= idetape_add_chrdev_read_request(drive
, tape
->capabilities
.ctl
);
3741 if (bytes_read
<= 0)
3743 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
3744 if (idetape_copy_stage_to_user(tape
, buf
, tape
->merge_stage
, temp
))
3746 actually_read
+= temp
;
3747 tape
->merge_stage_size
= bytes_read
-temp
;
3750 if (!actually_read
&& test_bit(IDETAPE_FILEMARK
, &tape
->flags
)) {
3751 #if IDETAPE_DEBUG_LOG
3752 if (tape
->debug_level
>= 2)
3753 printk(KERN_INFO
"ide-tape: %s: spacing over filemark\n", tape
->name
);
3755 idetape_space_over_filemarks(drive
, MTFSF
, 1);
3759 return (ret
) ? ret
: actually_read
;
3762 static ssize_t
idetape_chrdev_write (struct file
*file
, const char __user
*buf
,
3763 size_t count
, loff_t
*ppos
)
3765 struct ide_tape_obj
*tape
= ide_tape_f(file
);
3766 ide_drive_t
*drive
= tape
->drive
;
3767 ssize_t actually_written
= 0;
3770 /* The drive is write protected. */
3771 if (tape
->write_prot
)
3774 #if IDETAPE_DEBUG_LOG
3775 if (tape
->debug_level
>= 3)
3776 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_write, "
3777 "count %Zd\n", count
);
3778 #endif /* IDETAPE_DEBUG_LOG */
3780 /* Initialize write operation */
3781 if (tape
->chrdev_direction
!= idetape_direction_write
) {
3782 if (tape
->chrdev_direction
== idetape_direction_read
)
3783 idetape_discard_read_pipeline(drive
, 1);
3784 #if IDETAPE_DEBUG_BUGS
3785 if (tape
->merge_stage
|| tape
->merge_stage_size
) {
3786 printk(KERN_ERR
"ide-tape: merge_stage_size "
3787 "should be 0 now\n");
3788 tape
->merge_stage_size
= 0;
3790 #endif /* IDETAPE_DEBUG_BUGS */
3791 if ((tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 0, 0)) == NULL
)
3793 tape
->chrdev_direction
= idetape_direction_write
;
3794 idetape_init_merge_stage(tape
);
3797 * Issue a write 0 command to ensure that DSC handshake
3798 * is switched from completion mode to buffer available
3800 * No point in issuing this if DSC overlap isn't supported,
3801 * some drives (Seagate STT3401A) will return an error.
3803 if (drive
->dsc_overlap
) {
3804 ssize_t retval
= idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, 0, tape
->merge_stage
->bh
);
3806 __idetape_kfree_stage(tape
->merge_stage
);
3807 tape
->merge_stage
= NULL
;
3808 tape
->chrdev_direction
= idetape_direction_none
;
3815 if (tape
->restart_speed_control_req
)
3816 idetape_restart_speed_control(drive
);
3817 if (tape
->merge_stage_size
) {
3818 #if IDETAPE_DEBUG_BUGS
3819 if (tape
->merge_stage_size
>= tape
->stage_size
) {
3820 printk(KERN_ERR
"ide-tape: bug: merge buffer too big\n");
3821 tape
->merge_stage_size
= 0;
3823 #endif /* IDETAPE_DEBUG_BUGS */
3824 actually_written
= min((unsigned int)(tape
->stage_size
- tape
->merge_stage_size
), (unsigned int)count
);
3825 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, actually_written
))
3827 buf
+= actually_written
;
3828 tape
->merge_stage_size
+= actually_written
;
3829 count
-= actually_written
;
3831 if (tape
->merge_stage_size
== tape
->stage_size
) {
3833 tape
->merge_stage_size
= 0;
3834 retval
= idetape_add_chrdev_write_request(drive
, tape
->capabilities
.ctl
);
3839 while (count
>= tape
->stage_size
) {
3841 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, tape
->stage_size
))
3843 buf
+= tape
->stage_size
;
3844 count
-= tape
->stage_size
;
3845 retval
= idetape_add_chrdev_write_request(drive
, tape
->capabilities
.ctl
);
3846 actually_written
+= tape
->stage_size
;
3851 actually_written
+= count
;
3852 if (idetape_copy_stage_from_user(tape
, tape
->merge_stage
, buf
, count
))
3854 tape
->merge_stage_size
+= count
;
3856 return (ret
) ? ret
: actually_written
;
3859 static int idetape_write_filemark (ide_drive_t
*drive
)
3863 /* Write a filemark */
3864 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
3865 if (idetape_queue_pc_tail(drive
, &pc
)) {
3866 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
3873 * idetape_mtioctop is called from idetape_chrdev_ioctl when
3874 * the general mtio MTIOCTOP ioctl is requested.
3876 * We currently support the following mtio.h operations:
3878 * MTFSF - Space over mt_count filemarks in the positive direction.
3879 * The tape is positioned after the last spaced filemark.
3881 * MTFSFM - Same as MTFSF, but the tape is positioned before the
3884 * MTBSF - Steps background over mt_count filemarks, tape is
3885 * positioned before the last filemark.
3887 * MTBSFM - Like MTBSF, only tape is positioned after the last filemark.
3891 * MTBSF and MTBSFM are not supported when the tape doesn't
3892 * support spacing over filemarks in the reverse direction.
3893 * In this case, MTFSFM is also usually not supported (it is
3894 * supported in the rare case in which we crossed the filemark
3895 * during our read-ahead pipelined operation mode).
3897 * MTWEOF - Writes mt_count filemarks. Tape is positioned after
3898 * the last written filemark.
3900 * MTREW - Rewinds tape.
3902 * MTLOAD - Loads the tape.
3904 * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and
3905 * MTUNLOAD prevents further access until the media is replaced.
3907 * MTNOP - Flushes tape buffers.
3909 * MTRETEN - Retension media. This typically consists of one end
3910 * to end pass on the media.
3912 * MTEOM - Moves to the end of recorded data.
3914 * MTERASE - Erases tape.
3916 * MTSETBLK - Sets the user block size to mt_count bytes. If
3917 * mt_count is 0, we will attempt to autodetect
3920 * MTSEEK - Positions the tape in a specific block number, where
3921 * each block is assumed to contain which user_block_size
3924 * MTSETPART - Switches to another tape partition.
3926 * MTLOCK - Locks the tape door.
3928 * MTUNLOCK - Unlocks the tape door.
3930 * The following commands are currently not supported:
3932 * MTFSS, MTBSS, MTWSM, MTSETDENSITY,
3933 * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD.
3935 static int idetape_mtioctop (ide_drive_t
*drive
,short mt_op
,int mt_count
)
3937 idetape_tape_t
*tape
= drive
->driver_data
;
3941 #if IDETAPE_DEBUG_LOG
3942 if (tape
->debug_level
>= 1)
3943 printk(KERN_INFO
"ide-tape: Handling MTIOCTOP ioctl: "
3944 "mt_op=%d, mt_count=%d\n", mt_op
, mt_count
);
3945 #endif /* IDETAPE_DEBUG_LOG */
3947 * Commands which need our pipelined read-ahead stages.
3956 return (idetape_space_over_filemarks(drive
,mt_op
,mt_count
));
3962 if (tape
->write_prot
)
3964 idetape_discard_read_pipeline(drive
, 1);
3965 for (i
= 0; i
< mt_count
; i
++) {
3966 retval
= idetape_write_filemark(drive
);
3972 idetape_discard_read_pipeline(drive
, 0);
3973 if (idetape_rewind_tape(drive
))
3977 idetape_discard_read_pipeline(drive
, 0);
3978 idetape_create_load_unload_cmd(drive
, &pc
, IDETAPE_LU_LOAD_MASK
);
3979 return (idetape_queue_pc_tail(drive
, &pc
));
3983 * If door is locked, attempt to unlock before
3984 * attempting to eject.
3986 if (tape
->door_locked
) {
3987 if (idetape_create_prevent_cmd(drive
, &pc
, 0))
3988 if (!idetape_queue_pc_tail(drive
, &pc
))
3989 tape
->door_locked
= DOOR_UNLOCKED
;
3991 idetape_discard_read_pipeline(drive
, 0);
3992 idetape_create_load_unload_cmd(drive
, &pc
,!IDETAPE_LU_LOAD_MASK
);
3993 retval
= idetape_queue_pc_tail(drive
, &pc
);
3995 clear_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
);
3998 idetape_discard_read_pipeline(drive
, 0);
3999 return (idetape_flush_tape_buffers(drive
));
4001 idetape_discard_read_pipeline(drive
, 0);
4002 idetape_create_load_unload_cmd(drive
, &pc
,IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
4003 return (idetape_queue_pc_tail(drive
, &pc
));
4005 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
4006 return (idetape_queue_pc_tail(drive
, &pc
));
4008 (void) idetape_rewind_tape(drive
);
4009 idetape_create_erase_cmd(&pc
);
4010 return (idetape_queue_pc_tail(drive
, &pc
));
4013 if (mt_count
< tape
->tape_block_size
|| mt_count
% tape
->tape_block_size
)
4015 tape
->user_bs_factor
= mt_count
/ tape
->tape_block_size
;
4016 clear_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
4018 set_bit(IDETAPE_DETECT_BS
, &tape
->flags
);
4021 idetape_discard_read_pipeline(drive
, 0);
4022 return idetape_position_tape(drive
, mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
4024 idetape_discard_read_pipeline(drive
, 0);
4025 return (idetape_position_tape(drive
, 0, mt_count
, 0));
4029 if (!idetape_create_prevent_cmd(drive
, &pc
, 1))
4031 retval
= idetape_queue_pc_tail(drive
, &pc
);
4032 if (retval
) return retval
;
4033 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
4036 if (!idetape_create_prevent_cmd(drive
, &pc
, 0))
4038 retval
= idetape_queue_pc_tail(drive
, &pc
);
4039 if (retval
) return retval
;
4040 tape
->door_locked
= DOOR_UNLOCKED
;
4043 printk(KERN_ERR
"ide-tape: MTIO operation %d not "
4044 "supported\n", mt_op
);
4050 * Our character device ioctls.
4052 * General mtio.h magnetic io commands are supported here, and not in
4053 * the corresponding block interface.
4055 * The following ioctls are supported:
4057 * MTIOCTOP - Refer to idetape_mtioctop for detailed description.
4059 * MTIOCGET - The mt_dsreg field in the returned mtget structure
4060 * will be set to (user block size in bytes <<
4061 * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK.
4063 * The mt_blkno is set to the current user block number.
4064 * The other mtget fields are not supported.
4066 * MTIOCPOS - The current tape "block position" is returned. We
4067 * assume that each block contains user_block_size
4070 * Our own ide-tape ioctls are supported on both interfaces.
4072 static int idetape_chrdev_ioctl (struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
4074 struct ide_tape_obj
*tape
= ide_tape_f(file
);
4075 ide_drive_t
*drive
= tape
->drive
;
4079 int block_offset
= 0, position
= tape
->first_frame_position
;
4080 void __user
*argp
= (void __user
*)arg
;
4082 #if IDETAPE_DEBUG_LOG
4083 if (tape
->debug_level
>= 3)
4084 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_ioctl, "
4086 #endif /* IDETAPE_DEBUG_LOG */
4088 tape
->restart_speed_control_req
= 1;
4089 if (tape
->chrdev_direction
== idetape_direction_write
) {
4090 idetape_empty_write_pipeline(drive
);
4091 idetape_flush_tape_buffers(drive
);
4093 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
4094 block_offset
= idetape_pipeline_size(drive
) / (tape
->tape_block_size
* tape
->user_bs_factor
);
4095 if ((position
= idetape_read_position(drive
)) < 0)
4100 if (copy_from_user(&mtop
, argp
, sizeof (struct mtop
)))
4102 return (idetape_mtioctop(drive
,mtop
.mt_op
,mtop
.mt_count
));
4104 memset(&mtget
, 0, sizeof (struct mtget
));
4105 mtget
.mt_type
= MT_ISSCSI2
;
4106 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
4107 mtget
.mt_dsreg
= ((tape
->tape_block_size
* tape
->user_bs_factor
) << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
4108 if (tape
->drv_write_prot
) {
4109 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
4111 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
4115 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
4116 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
4120 if (tape
->chrdev_direction
== idetape_direction_read
)
4121 idetape_discard_read_pipeline(drive
, 1);
4122 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
4126 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t
*drive
);
4129 * Our character device open function.
4131 static int idetape_chrdev_open (struct inode
*inode
, struct file
*filp
)
4133 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
4135 idetape_tape_t
*tape
;
4140 * We really want to do nonseekable_open(inode, filp); here, but some
4141 * versions of tar incorrectly call lseek on tapes and bail out if that
4142 * fails. So we disallow pread() and pwrite(), but permit lseeks.
4144 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
4146 #if IDETAPE_DEBUG_LOG
4147 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_open\n");
4148 #endif /* IDETAPE_DEBUG_LOG */
4150 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
4153 if (!(tape
= ide_tape_chrdev_get(i
)))
4156 drive
= tape
->drive
;
4158 filp
->private_data
= tape
;
4160 if (test_and_set_bit(IDETAPE_BUSY
, &tape
->flags
)) {
4165 retval
= idetape_wait_ready(drive
, 60 * HZ
);
4167 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
4168 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
4172 idetape_read_position(drive
);
4173 if (!test_bit(IDETAPE_ADDRESS_VALID
, &tape
->flags
))
4174 (void)idetape_rewind_tape(drive
);
4176 if (tape
->chrdev_direction
!= idetape_direction_read
)
4177 clear_bit(IDETAPE_PIPELINE_ERROR
, &tape
->flags
);
4179 /* Read block size and write protect status from drive. */
4180 idetape_get_blocksize_from_block_descriptor(drive
);
4182 /* Set write protect flag if device is opened as read-only. */
4183 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
4184 tape
->write_prot
= 1;
4186 tape
->write_prot
= tape
->drv_write_prot
;
4188 /* Make sure drive isn't write protected if user wants to write. */
4189 if (tape
->write_prot
) {
4190 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
4191 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
4192 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
4199 * Lock the tape drive door so user can't eject.
4201 if (tape
->chrdev_direction
== idetape_direction_none
) {
4202 if (idetape_create_prevent_cmd(drive
, &pc
, 1)) {
4203 if (!idetape_queue_pc_tail(drive
, &pc
)) {
4204 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
4205 tape
->door_locked
= DOOR_LOCKED
;
4209 idetape_restart_speed_control(drive
);
4210 tape
->restart_speed_control_req
= 0;
4218 static void idetape_write_release (ide_drive_t
*drive
, unsigned int minor
)
4220 idetape_tape_t
*tape
= drive
->driver_data
;
4222 idetape_empty_write_pipeline(drive
);
4223 tape
->merge_stage
= __idetape_kmalloc_stage(tape
, 1, 0);
4224 if (tape
->merge_stage
!= NULL
) {
4225 idetape_pad_zeros(drive
, tape
->tape_block_size
* (tape
->user_bs_factor
- 1));
4226 __idetape_kfree_stage(tape
->merge_stage
);
4227 tape
->merge_stage
= NULL
;
4229 idetape_write_filemark(drive
);
4230 idetape_flush_tape_buffers(drive
);
4231 idetape_flush_tape_buffers(drive
);
4235 * Our character device release function.
4237 static int idetape_chrdev_release (struct inode
*inode
, struct file
*filp
)
4239 struct ide_tape_obj
*tape
= ide_tape_f(filp
);
4240 ide_drive_t
*drive
= tape
->drive
;
4242 unsigned int minor
= iminor(inode
);
4245 tape
= drive
->driver_data
;
4246 #if IDETAPE_DEBUG_LOG
4247 if (tape
->debug_level
>= 3)
4248 printk(KERN_INFO
"ide-tape: Reached idetape_chrdev_release\n");
4249 #endif /* IDETAPE_DEBUG_LOG */
4251 if (tape
->chrdev_direction
== idetape_direction_write
)
4252 idetape_write_release(drive
, minor
);
4253 if (tape
->chrdev_direction
== idetape_direction_read
) {
4255 idetape_discard_read_pipeline(drive
, 1);
4257 idetape_wait_for_pipeline(drive
);
4259 if (tape
->cache_stage
!= NULL
) {
4260 __idetape_kfree_stage(tape
->cache_stage
);
4261 tape
->cache_stage
= NULL
;
4263 if (minor
< 128 && test_bit(IDETAPE_MEDIUM_PRESENT
, &tape
->flags
))
4264 (void) idetape_rewind_tape(drive
);
4265 if (tape
->chrdev_direction
== idetape_direction_none
) {
4266 if (tape
->door_locked
== DOOR_LOCKED
) {
4267 if (idetape_create_prevent_cmd(drive
, &pc
, 0)) {
4268 if (!idetape_queue_pc_tail(drive
, &pc
))
4269 tape
->door_locked
= DOOR_UNLOCKED
;
4273 clear_bit(IDETAPE_BUSY
, &tape
->flags
);
4280 * idetape_identify_device is called to check the contents of the
4281 * ATAPI IDENTIFY command results. We return:
4283 * 1 If the tape can be supported by us, based on the information
4286 * 0 If this tape driver is not currently supported by us.
4288 static int idetape_identify_device (ide_drive_t
*drive
)
4290 struct idetape_id_gcw gcw
;
4291 struct hd_driveid
*id
= drive
->id
;
4293 if (drive
->id_read
== 0)
4296 *((unsigned short *) &gcw
) = id
->config
;
4298 #if IDETAPE_DEBUG_INFO
4299 printk(KERN_INFO
"ide-tape: Dumping ATAPI Identify Device tape parameters\n");
4300 printk(KERN_INFO
"ide-tape: Protocol Type: ");
4301 switch (gcw
.protocol
) {
4302 case 0: case 1: printk("ATA\n");break;
4303 case 2: printk("ATAPI\n");break;
4304 case 3: printk("Reserved (Unknown to ide-tape)\n");break;
4306 printk(KERN_INFO
"ide-tape: Device Type: %x - ",gcw
.device_type
);
4307 switch (gcw
.device_type
) {
4308 case 0: printk("Direct-access Device\n");break;
4309 case 1: printk("Streaming Tape Device\n");break;
4310 case 2: case 3: case 4: printk("Reserved\n");break;
4311 case 5: printk("CD-ROM Device\n");break;
4312 case 6: printk("Reserved\n");
4313 case 7: printk("Optical memory Device\n");break;
4314 case 0x1f: printk("Unknown or no Device type\n");break;
4315 default: printk("Reserved\n");
4317 printk(KERN_INFO
"ide-tape: Removable: %s",gcw
.removable
? "Yes\n":"No\n");
4318 printk(KERN_INFO
"ide-tape: Command Packet DRQ Type: ");
4319 switch (gcw
.drq_type
) {
4320 case 0: printk("Microprocessor DRQ\n");break;
4321 case 1: printk("Interrupt DRQ\n");break;
4322 case 2: printk("Accelerated DRQ\n");break;
4323 case 3: printk("Reserved\n");break;
4325 printk(KERN_INFO
"ide-tape: Command Packet Size: ");
4326 switch (gcw
.packet_size
) {
4327 case 0: printk("12 bytes\n");break;
4328 case 1: printk("16 bytes\n");break;
4329 default: printk("Reserved\n");break;
4331 #endif /* IDETAPE_DEBUG_INFO */
4333 /* Check that we can support this device */
4335 if (gcw
.protocol
!=2 )
4336 printk(KERN_ERR
"ide-tape: Protocol is not ATAPI\n");
4337 else if (gcw
.device_type
!= 1)
4338 printk(KERN_ERR
"ide-tape: Device type is not set to tape\n");
4339 else if (!gcw
.removable
)
4340 printk(KERN_ERR
"ide-tape: The removable flag is not set\n");
4341 else if (gcw
.packet_size
!= 0) {
4342 printk(KERN_ERR
"ide-tape: Packet size is not 12 bytes long\n");
4343 if (gcw
.packet_size
== 1)
4344 printk(KERN_ERR
"ide-tape: Sorry, padding to 16 bytes is still not supported\n");
4351 * Use INQUIRY to get the firmware revision
4353 static void idetape_get_inquiry_results (ide_drive_t
*drive
)
4356 idetape_tape_t
*tape
= drive
->driver_data
;
4358 idetape_inquiry_result_t
*inquiry
;
4360 idetape_create_inquiry_cmd(&pc
);
4361 if (idetape_queue_pc_tail(drive
, &pc
)) {
4362 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n", tape
->name
);
4365 inquiry
= (idetape_inquiry_result_t
*) pc
.buffer
;
4366 memcpy(tape
->vendor_id
, inquiry
->vendor_id
, 8);
4367 memcpy(tape
->product_id
, inquiry
->product_id
, 16);
4368 memcpy(tape
->firmware_revision
, inquiry
->revision_level
, 4);
4369 ide_fixstring(tape
->vendor_id
, 10, 0);
4370 ide_fixstring(tape
->product_id
, 18, 0);
4371 ide_fixstring(tape
->firmware_revision
, 6, 0);
4372 r
= tape
->firmware_revision
;
4373 if (*(r
+ 1) == '.')
4374 tape
->firmware_revision_num
= (*r
- '0') * 100 + (*(r
+ 2) - '0') * 10 + *(r
+ 3) - '0';
4375 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
);
4379 * idetape_get_mode_sense_results asks the tape about its various
4380 * parameters. In particular, we will adjust our data transfer buffer
4381 * size to the recommended value as returned by the tape.
4383 static void idetape_get_mode_sense_results (ide_drive_t
*drive
)
4385 idetape_tape_t
*tape
= drive
->driver_data
;
4387 idetape_mode_parameter_header_t
*header
;
4388 idetape_capabilities_page_t
*capabilities
;
4390 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
4391 if (idetape_queue_pc_tail(drive
, &pc
)) {
4392 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming some default values\n");
4393 tape
->tape_block_size
= 512;
4394 tape
->capabilities
.ctl
= 52;
4395 tape
->capabilities
.speed
= 450;
4396 tape
->capabilities
.buffer_size
= 6 * 52;
4399 header
= (idetape_mode_parameter_header_t
*) pc
.buffer
;
4400 capabilities
= (idetape_capabilities_page_t
*) (pc
.buffer
+ sizeof(idetape_mode_parameter_header_t
) + header
->bdl
);
4402 capabilities
->max_speed
= ntohs(capabilities
->max_speed
);
4403 capabilities
->ctl
= ntohs(capabilities
->ctl
);
4404 capabilities
->speed
= ntohs(capabilities
->speed
);
4405 capabilities
->buffer_size
= ntohs(capabilities
->buffer_size
);
4407 if (!capabilities
->speed
) {
4408 printk(KERN_INFO
"ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive
->name
);
4409 capabilities
->speed
= 650;
4411 if (!capabilities
->max_speed
) {
4412 printk(KERN_INFO
"ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive
->name
);
4413 capabilities
->max_speed
= 650;
4416 tape
->capabilities
= *capabilities
; /* Save us a copy */
4417 if (capabilities
->blk512
)
4418 tape
->tape_block_size
= 512;
4419 else if (capabilities
->blk1024
)
4420 tape
->tape_block_size
= 1024;
4422 #if IDETAPE_DEBUG_INFO
4423 printk(KERN_INFO
"ide-tape: Dumping the results of the MODE SENSE packet command\n");
4424 printk(KERN_INFO
"ide-tape: Mode Parameter Header:\n");
4425 printk(KERN_INFO
"ide-tape: Mode Data Length - %d\n",header
->mode_data_length
);
4426 printk(KERN_INFO
"ide-tape: Medium Type - %d\n",header
->medium_type
);
4427 printk(KERN_INFO
"ide-tape: Device Specific Parameter - %d\n",header
->dsp
);
4428 printk(KERN_INFO
"ide-tape: Block Descriptor Length - %d\n",header
->bdl
);
4430 printk(KERN_INFO
"ide-tape: Capabilities and Mechanical Status Page:\n");
4431 printk(KERN_INFO
"ide-tape: Page code - %d\n",capabilities
->page_code
);
4432 printk(KERN_INFO
"ide-tape: Page length - %d\n",capabilities
->page_length
);
4433 printk(KERN_INFO
"ide-tape: Read only - %s\n",capabilities
->ro
? "Yes":"No");
4434 printk(KERN_INFO
"ide-tape: Supports reverse space - %s\n",capabilities
->sprev
? "Yes":"No");
4435 printk(KERN_INFO
"ide-tape: Supports erase initiated formatting - %s\n",capabilities
->efmt
? "Yes":"No");
4436 printk(KERN_INFO
"ide-tape: Supports QFA two Partition format - %s\n",capabilities
->qfa
? "Yes":"No");
4437 printk(KERN_INFO
"ide-tape: Supports locking the medium - %s\n",capabilities
->lock
? "Yes":"No");
4438 printk(KERN_INFO
"ide-tape: The volume is currently locked - %s\n",capabilities
->locked
? "Yes":"No");
4439 printk(KERN_INFO
"ide-tape: The device defaults in the prevent state - %s\n",capabilities
->prevent
? "Yes":"No");
4440 printk(KERN_INFO
"ide-tape: Supports ejecting the medium - %s\n",capabilities
->eject
? "Yes":"No");
4441 printk(KERN_INFO
"ide-tape: Supports error correction - %s\n",capabilities
->ecc
? "Yes":"No");
4442 printk(KERN_INFO
"ide-tape: Supports data compression - %s\n",capabilities
->cmprs
? "Yes":"No");
4443 printk(KERN_INFO
"ide-tape: Supports 512 bytes block size - %s\n",capabilities
->blk512
? "Yes":"No");
4444 printk(KERN_INFO
"ide-tape: Supports 1024 bytes block size - %s\n",capabilities
->blk1024
? "Yes":"No");
4445 printk(KERN_INFO
"ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities
->blk32768
? "Yes":"No");
4446 printk(KERN_INFO
"ide-tape: Maximum supported speed in KBps - %d\n",capabilities
->max_speed
);
4447 printk(KERN_INFO
"ide-tape: Continuous transfer limits in blocks - %d\n",capabilities
->ctl
);
4448 printk(KERN_INFO
"ide-tape: Current speed in KBps - %d\n",capabilities
->speed
);
4449 printk(KERN_INFO
"ide-tape: Buffer size - %d\n",capabilities
->buffer_size
*512);
4450 #endif /* IDETAPE_DEBUG_INFO */
4454 * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor
4455 * and if it succeeds sets the tape block size with the reported value
4457 static void idetape_get_blocksize_from_block_descriptor(ide_drive_t
*drive
)
4460 idetape_tape_t
*tape
= drive
->driver_data
;
4462 idetape_mode_parameter_header_t
*header
;
4463 idetape_parameter_block_descriptor_t
*block_descrp
;
4465 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
4466 if (idetape_queue_pc_tail(drive
, &pc
)) {
4467 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
4468 if (tape
->tape_block_size
== 0) {
4469 printk(KERN_WARNING
"ide-tape: Cannot deal with zero block size, assume 32k\n");
4470 tape
->tape_block_size
= 32768;
4474 header
= (idetape_mode_parameter_header_t
*) pc
.buffer
;
4475 block_descrp
= (idetape_parameter_block_descriptor_t
*) (pc
.buffer
+ sizeof(idetape_mode_parameter_header_t
));
4476 tape
->tape_block_size
=( block_descrp
->length
[0]<<16) + (block_descrp
->length
[1]<<8) + block_descrp
->length
[2];
4477 tape
->drv_write_prot
= (header
->dsp
& 0x80) >> 7;
4479 #if IDETAPE_DEBUG_INFO
4480 printk(KERN_INFO
"ide-tape: Adjusted block size - %d\n", tape
->tape_block_size
);
4481 #endif /* IDETAPE_DEBUG_INFO */
4484 #ifdef CONFIG_IDE_PROC_FS
4485 static void idetape_add_settings (ide_drive_t
*drive
)
4487 idetape_tape_t
*tape
= drive
->driver_data
;
4490 * drive setting name read/write data type min max mul_factor div_factor data pointer set function
4492 ide_add_setting(drive
, "buffer", SETTING_READ
, TYPE_SHORT
, 0, 0xffff, 1, 2, &tape
->capabilities
.buffer_size
, NULL
);
4493 ide_add_setting(drive
, "pipeline_min", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->min_pipeline
, NULL
);
4494 ide_add_setting(drive
, "pipeline", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_stages
, NULL
);
4495 ide_add_setting(drive
, "pipeline_max", SETTING_RW
, TYPE_INT
, 1, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->max_pipeline
, NULL
);
4496 ide_add_setting(drive
, "pipeline_used", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_stages
, NULL
);
4497 ide_add_setting(drive
, "pipeline_pending", SETTING_READ
, TYPE_INT
, 0, 0xffff, tape
->stage_size
/ 1024, 1, &tape
->nr_pending_stages
, NULL
);
4498 ide_add_setting(drive
, "speed", SETTING_READ
, TYPE_SHORT
, 0, 0xffff, 1, 1, &tape
->capabilities
.speed
, NULL
);
4499 ide_add_setting(drive
, "stage", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1024, &tape
->stage_size
, NULL
);
4500 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
);
4501 ide_add_setting(drive
, "dsc_overlap", SETTING_RW
, TYPE_BYTE
, 0, 1, 1, 1, &drive
->dsc_overlap
, NULL
);
4502 ide_add_setting(drive
, "pipeline_head_speed_c",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->controlled_pipeline_head_speed
, NULL
);
4503 ide_add_setting(drive
, "pipeline_head_speed_u",SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->uncontrolled_pipeline_head_speed
,NULL
);
4504 ide_add_setting(drive
, "avg_speed", SETTING_READ
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->avg_speed
, NULL
);
4505 ide_add_setting(drive
, "debug_level", SETTING_RW
, TYPE_INT
, 0, 0xffff, 1, 1, &tape
->debug_level
, NULL
);
4508 static inline void idetape_add_settings(ide_drive_t
*drive
) { ; }
4512 * ide_setup is called to:
4514 * 1. Initialize our various state variables.
4515 * 2. Ask the tape for its capabilities.
4516 * 3. Allocate a buffer which will be used for data
4517 * transfer. The buffer size is chosen based on
4518 * the recommendation which we received in step (2).
4520 * Note that at this point ide.c already assigned us an irq, so that
4521 * we can queue requests here and wait for their completion.
4523 static void idetape_setup (ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
4525 unsigned long t1
, tmid
, tn
, t
;
4527 struct idetape_id_gcw gcw
;
4531 spin_lock_init(&tape
->spinlock
);
4532 drive
->dsc_overlap
= 1;
4533 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
4534 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
4536 drive
->dsc_overlap
= 0;
4538 /* Seagate Travan drives do not support DSC overlap. */
4539 if (strstr(drive
->id
->model
, "Seagate STT3401"))
4540 drive
->dsc_overlap
= 0;
4541 tape
->minor
= minor
;
4542 tape
->name
[0] = 'h';
4543 tape
->name
[1] = 't';
4544 tape
->name
[2] = '0' + minor
;
4545 tape
->chrdev_direction
= idetape_direction_none
;
4546 tape
->pc
= tape
->pc_stack
;
4547 tape
->max_insert_speed
= 10000;
4548 tape
->speed_control
= 1;
4549 *((unsigned short *) &gcw
) = drive
->id
->config
;
4550 if (gcw
.drq_type
== 1)
4551 set_bit(IDETAPE_DRQ_INTERRUPT
, &tape
->flags
);
4553 tape
->min_pipeline
= tape
->max_pipeline
= tape
->max_stages
= 10;
4555 idetape_get_inquiry_results(drive
);
4556 idetape_get_mode_sense_results(drive
);
4557 idetape_get_blocksize_from_block_descriptor(drive
);
4558 tape
->user_bs_factor
= 1;
4559 tape
->stage_size
= tape
->capabilities
.ctl
* tape
->tape_block_size
;
4560 while (tape
->stage_size
> 0xffff) {
4561 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
4562 tape
->capabilities
.ctl
/= 2;
4563 tape
->stage_size
= tape
->capabilities
.ctl
* tape
->tape_block_size
;
4565 stage_size
= tape
->stage_size
;
4566 tape
->pages_per_stage
= stage_size
/ PAGE_SIZE
;
4567 if (stage_size
% PAGE_SIZE
) {
4568 tape
->pages_per_stage
++;
4569 tape
->excess_bh_size
= PAGE_SIZE
- stage_size
% PAGE_SIZE
;
4573 * Select the "best" DSC read/write polling frequency
4574 * and pipeline size.
4576 speed
= max(tape
->capabilities
.speed
, tape
->capabilities
.max_speed
);
4578 tape
->max_stages
= speed
* 1000 * 10 / tape
->stage_size
;
4581 * Limit memory use for pipeline to 10% of physical memory
4584 if (tape
->max_stages
* tape
->stage_size
> si
.totalram
* si
.mem_unit
/ 10)
4585 tape
->max_stages
= si
.totalram
* si
.mem_unit
/ (10 * tape
->stage_size
);
4586 tape
->max_stages
= min(tape
->max_stages
, IDETAPE_MAX_PIPELINE_STAGES
);
4587 tape
->min_pipeline
= min(tape
->max_stages
, IDETAPE_MIN_PIPELINE_STAGES
);
4588 tape
->max_pipeline
= min(tape
->max_stages
* 2, IDETAPE_MAX_PIPELINE_STAGES
);
4589 if (tape
->max_stages
== 0)
4590 tape
->max_stages
= tape
->min_pipeline
= tape
->max_pipeline
= 1;
4592 t1
= (tape
->stage_size
* HZ
) / (speed
* 1000);
4593 tmid
= (tape
->capabilities
.buffer_size
* 32 * HZ
) / (speed
* 125);
4594 tn
= (IDETAPE_FIFO_THRESHOLD
* tape
->stage_size
* HZ
) / (speed
* 1000);
4596 if (tape
->max_stages
)
4602 * Ensure that the number we got makes sense; limit
4603 * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
4605 tape
->best_dsc_rw_frequency
= max_t(unsigned long, min_t(unsigned long, t
, IDETAPE_DSC_RW_MAX
), IDETAPE_DSC_RW_MIN
);
4606 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
4607 "%dkB pipeline, %lums tDSC%s\n",
4608 drive
->name
, tape
->name
, tape
->capabilities
.speed
,
4609 (tape
->capabilities
.buffer_size
* 512) / tape
->stage_size
,
4610 tape
->stage_size
/ 1024,
4611 tape
->max_stages
* tape
->stage_size
/ 1024,
4612 tape
->best_dsc_rw_frequency
* 1000 / HZ
,
4613 drive
->using_dma
? ", DMA":"");
4615 idetape_add_settings(drive
);
4618 static void ide_tape_remove(ide_drive_t
*drive
)
4620 idetape_tape_t
*tape
= drive
->driver_data
;
4622 ide_proc_unregister_driver(drive
, tape
->driver
);
4624 ide_unregister_region(tape
->disk
);
4629 static void ide_tape_release(struct kref
*kref
)
4631 struct ide_tape_obj
*tape
= to_ide_tape(kref
);
4632 ide_drive_t
*drive
= tape
->drive
;
4633 struct gendisk
*g
= tape
->disk
;
4635 BUG_ON(tape
->first_stage
!= NULL
|| tape
->merge_stage_size
);
4637 drive
->dsc_overlap
= 0;
4638 drive
->driver_data
= NULL
;
4639 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
4640 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
4641 idetape_devs
[tape
->minor
] = NULL
;
4642 g
->private_data
= NULL
;
4647 #ifdef CONFIG_IDE_PROC_FS
4648 static int proc_idetape_read_name
4649 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
4651 ide_drive_t
*drive
= (ide_drive_t
*) data
;
4652 idetape_tape_t
*tape
= drive
->driver_data
;
4656 len
= sprintf(out
, "%s\n", tape
->name
);
4657 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
4660 static ide_proc_entry_t idetape_proc
[] = {
4661 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
4662 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
4663 { NULL
, 0, NULL
, NULL
}
4667 static int ide_tape_probe(ide_drive_t
*);
4669 static ide_driver_t idetape_driver
= {
4671 .owner
= THIS_MODULE
,
4673 .bus
= &ide_bus_type
,
4675 .probe
= ide_tape_probe
,
4676 .remove
= ide_tape_remove
,
4677 .version
= IDETAPE_VERSION
,
4679 .supports_dsc_overlap
= 1,
4680 .do_request
= idetape_do_request
,
4681 .end_request
= idetape_end_request
,
4682 .error
= __ide_error
,
4683 .abort
= __ide_abort
,
4684 #ifdef CONFIG_IDE_PROC_FS
4685 .proc
= idetape_proc
,
4690 * Our character device supporting functions, passed to register_chrdev.
4692 static const struct file_operations idetape_fops
= {
4693 .owner
= THIS_MODULE
,
4694 .read
= idetape_chrdev_read
,
4695 .write
= idetape_chrdev_write
,
4696 .ioctl
= idetape_chrdev_ioctl
,
4697 .open
= idetape_chrdev_open
,
4698 .release
= idetape_chrdev_release
,
4701 static int idetape_open(struct inode
*inode
, struct file
*filp
)
4703 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
4704 struct ide_tape_obj
*tape
;
4706 if (!(tape
= ide_tape_get(disk
)))
4712 static int idetape_release(struct inode
*inode
, struct file
*filp
)
4714 struct gendisk
*disk
= inode
->i_bdev
->bd_disk
;
4715 struct ide_tape_obj
*tape
= ide_tape_g(disk
);
4722 static int idetape_ioctl(struct inode
*inode
, struct file
*file
,
4723 unsigned int cmd
, unsigned long arg
)
4725 struct block_device
*bdev
= inode
->i_bdev
;
4726 struct ide_tape_obj
*tape
= ide_tape_g(bdev
->bd_disk
);
4727 ide_drive_t
*drive
= tape
->drive
;
4728 int err
= generic_ide_ioctl(drive
, file
, bdev
, cmd
, arg
);
4730 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
4734 static struct block_device_operations idetape_block_ops
= {
4735 .owner
= THIS_MODULE
,
4736 .open
= idetape_open
,
4737 .release
= idetape_release
,
4738 .ioctl
= idetape_ioctl
,
4741 static int ide_tape_probe(ide_drive_t
*drive
)
4743 idetape_tape_t
*tape
;
4747 if (!strstr("ide-tape", drive
->driver_req
))
4749 if (!drive
->present
)
4751 if (drive
->media
!= ide_tape
)
4753 if (!idetape_identify_device (drive
)) {
4754 printk(KERN_ERR
"ide-tape: %s: not supported by this version of ide-tape\n", drive
->name
);
4758 printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive
->name
);
4761 if (strstr(drive
->id
->model
, "OnStream DI-")) {
4762 printk(KERN_WARNING
"ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive
->name
);
4763 printk(KERN_WARNING
"ide-tape: OnStream support will be removed soon from ide-tape!\n");
4765 tape
= kzalloc(sizeof (idetape_tape_t
), GFP_KERNEL
);
4767 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape structure\n", drive
->name
);
4771 g
= alloc_disk(1 << PARTN_BITS
);
4775 ide_init_disk(g
, drive
);
4777 ide_proc_register_driver(drive
, &idetape_driver
);
4779 kref_init(&tape
->kref
);
4781 tape
->drive
= drive
;
4782 tape
->driver
= &idetape_driver
;
4785 g
->private_data
= &tape
->driver
;
4787 drive
->driver_data
= tape
;
4789 mutex_lock(&idetape_ref_mutex
);
4790 for (minor
= 0; idetape_devs
[minor
]; minor
++)
4792 idetape_devs
[minor
] = tape
;
4793 mutex_unlock(&idetape_ref_mutex
);
4795 idetape_setup(drive
, tape
, minor
);
4797 device_create(idetape_sysfs_class
, &drive
->gendev
,
4798 MKDEV(IDETAPE_MAJOR
, minor
), "%s", tape
->name
);
4799 device_create(idetape_sysfs_class
, &drive
->gendev
,
4800 MKDEV(IDETAPE_MAJOR
, minor
+ 128), "n%s", tape
->name
);
4802 g
->fops
= &idetape_block_ops
;
4803 ide_register_region(g
);
4813 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
4814 MODULE_LICENSE("GPL");
4816 static void __exit
idetape_exit (void)
4818 driver_unregister(&idetape_driver
.gen_driver
);
4819 class_destroy(idetape_sysfs_class
);
4820 unregister_chrdev(IDETAPE_MAJOR
, "ht");
4823 static int __init
idetape_init(void)
4826 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
4827 if (IS_ERR(idetape_sysfs_class
)) {
4828 idetape_sysfs_class
= NULL
;
4829 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
4834 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
4835 printk(KERN_ERR
"ide-tape: Failed to register character device interface\n");
4837 goto out_free_class
;
4840 error
= driver_register(&idetape_driver
.gen_driver
);
4842 goto out_free_driver
;
4847 driver_unregister(&idetape_driver
.gen_driver
);
4849 class_destroy(idetape_sysfs_class
);
4854 MODULE_ALIAS("ide:*m-tape*");
4855 module_init(idetape_init
);
4856 module_exit(idetape_exit
);
4857 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);