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Diffstat (limited to 'drivers/ide/ide-tape.c')
-rw-r--r-- | drivers/ide/ide-tape.c | 4937 |
1 files changed, 4937 insertions, 0 deletions
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c new file mode 100644 index 000000000000..482544854985 --- /dev/null +++ b/drivers/ide/ide-tape.c | |||
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1 | /* | ||
2 | * linux/drivers/ide/ide-tape.c Version 1.19 Nov, 2003 | ||
3 | * | ||
4 | * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il> | ||
5 | * | ||
6 | * $Header$ | ||
7 | * | ||
8 | * This driver was constructed as a student project in the software laboratory | ||
9 | * of the faculty of electrical engineering in the Technion - Israel's | ||
10 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | ||
11 | * | ||
12 | * It is hereby placed under the terms of the GNU general public license. | ||
13 | * (See linux/COPYING). | ||
14 | */ | ||
15 | |||
16 | /* | ||
17 | * IDE ATAPI streaming tape driver. | ||
18 | * | ||
19 | * This driver is a part of the Linux ide driver and works in co-operation | ||
20 | * with linux/drivers/block/ide.c. | ||
21 | * | ||
22 | * The driver, in co-operation with ide.c, basically traverses the | ||
23 | * request-list for the block device interface. The character device | ||
24 | * interface, on the other hand, creates new requests, adds them | ||
25 | * to the request-list of the block device, and waits for their completion. | ||
26 | * | ||
27 | * Pipelined operation mode is now supported on both reads and writes. | ||
28 | * | ||
29 | * The block device major and minor numbers are determined from the | ||
30 | * tape's relative position in the ide interfaces, as explained in ide.c. | ||
31 | * | ||
32 | * The character device interface consists of the following devices: | ||
33 | * | ||
34 | * ht0 major 37, minor 0 first IDE tape, rewind on close. | ||
35 | * ht1 major 37, minor 1 second IDE tape, rewind on close. | ||
36 | * ... | ||
37 | * nht0 major 37, minor 128 first IDE tape, no rewind on close. | ||
38 | * nht1 major 37, minor 129 second IDE tape, no rewind on close. | ||
39 | * ... | ||
40 | * | ||
41 | * Run linux/scripts/MAKEDEV.ide to create the above entries. | ||
42 | * | ||
43 | * The general magnetic tape commands compatible interface, as defined by | ||
44 | * include/linux/mtio.h, is accessible through the character device. | ||
45 | * | ||
46 | * General ide driver configuration options, such as the interrupt-unmask | ||
47 | * flag, can be configured by issuing an ioctl to the block device interface, | ||
48 | * as any other ide device. | ||
49 | * | ||
50 | * Our own ide-tape ioctl's can be issued to either the block device or | ||
51 | * the character device interface. | ||
52 | * | ||
53 | * Maximal throughput with minimal bus load will usually be achieved in the | ||
54 | * following scenario: | ||
55 | * | ||
56 | * 1. ide-tape is operating in the pipelined operation mode. | ||
57 | * 2. No buffering is performed by the user backup program. | ||
58 | * | ||
59 | * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive. | ||
60 | * | ||
61 | * Ver 0.1 Nov 1 95 Pre-working code :-) | ||
62 | * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure | ||
63 | * was successful ! (Using tar cvf ... on the block | ||
64 | * device interface). | ||
65 | * A longer backup resulted in major swapping, bad | ||
66 | * overall Linux performance and eventually failed as | ||
67 | * we received non serial read-ahead requests from the | ||
68 | * buffer cache. | ||
69 | * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the | ||
70 | * character device interface. Linux's responsiveness | ||
71 | * and performance doesn't seem to be much affected | ||
72 | * from the background backup procedure. | ||
73 | * Some general mtio.h magnetic tape operations are | ||
74 | * now supported by our character device. As a result, | ||
75 | * popular tape utilities are starting to work with | ||
76 | * ide tapes :-) | ||
77 | * The following configurations were tested: | ||
78 | * 1. An IDE ATAPI TAPE shares the same interface | ||
79 | * and irq with an IDE ATAPI CDROM. | ||
80 | * 2. An IDE ATAPI TAPE shares the same interface | ||
81 | * and irq with a normal IDE disk. | ||
82 | * Both configurations seemed to work just fine ! | ||
83 | * However, to be on the safe side, it is meanwhile | ||
84 | * recommended to give the IDE TAPE its own interface | ||
85 | * and irq. | ||
86 | * The one thing which needs to be done here is to | ||
87 | * add a "request postpone" feature to ide.c, | ||
88 | * so that we won't have to wait for the tape to finish | ||
89 | * performing a long media access (DSC) request (such | ||
90 | * as a rewind) before we can access the other device | ||
91 | * on the same interface. This effect doesn't disturb | ||
92 | * normal operation most of the time because read/write | ||
93 | * requests are relatively fast, and once we are | ||
94 | * performing one tape r/w request, a lot of requests | ||
95 | * from the other device can be queued and ide.c will | ||
96 | * service all of them after this single tape request. | ||
97 | * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree. | ||
98 | * On each read / write request, we now ask the drive | ||
99 | * if we can transfer a constant number of bytes | ||
100 | * (a parameter of the drive) only to its buffers, | ||
101 | * without causing actual media access. If we can't, | ||
102 | * we just wait until we can by polling the DSC bit. | ||
103 | * This ensures that while we are not transferring | ||
104 | * more bytes than the constant referred to above, the | ||
105 | * interrupt latency will not become too high and | ||
106 | * we won't cause an interrupt timeout, as happened | ||
107 | * occasionally in the previous version. | ||
108 | * While polling for DSC, the current request is | ||
109 | * postponed and ide.c is free to handle requests from | ||
110 | * the other device. This is handled transparently to | ||
111 | * ide.c. The hwgroup locking method which was used | ||
112 | * in the previous version was removed. | ||
113 | * Use of new general features which are provided by | ||
114 | * ide.c for use with atapi devices. | ||
115 | * (Programming done by Mark Lord) | ||
116 | * Few potential bug fixes (Again, suggested by Mark) | ||
117 | * Single character device data transfers are now | ||
118 | * not limited in size, as they were before. | ||
119 | * We are asking the tape about its recommended | ||
120 | * transfer unit and send a larger data transfer | ||
121 | * as several transfers of the above size. | ||
122 | * For best results, use an integral number of this | ||
123 | * basic unit (which is shown during driver | ||
124 | * initialization). I will soon add an ioctl to get | ||
125 | * this important parameter. | ||
126 | * Our data transfer buffer is allocated on startup, | ||
127 | * rather than before each data transfer. This should | ||
128 | * ensure that we will indeed have a data buffer. | ||
129 | * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape | ||
130 | * shared an interface with another device. | ||
131 | * (poll_for_dsc was a complete mess). | ||
132 | * Removed some old (non-active) code which had | ||
133 | * to do with supporting buffer cache originated | ||
134 | * requests. | ||
135 | * The block device interface can now be opened, so | ||
136 | * that general ide driver features like the unmask | ||
137 | * interrupts flag can be selected with an ioctl. | ||
138 | * This is the only use of the block device interface. | ||
139 | * New fast pipelined operation mode (currently only on | ||
140 | * writes). When using the pipelined mode, the | ||
141 | * throughput can potentially reach the maximum | ||
142 | * tape supported throughput, regardless of the | ||
143 | * user backup program. On my tape drive, it sometimes | ||
144 | * boosted performance by a factor of 2. Pipelined | ||
145 | * mode is enabled by default, but since it has a few | ||
146 | * downfalls as well, you may want to disable it. | ||
147 | * A short explanation of the pipelined operation mode | ||
148 | * is available below. | ||
149 | * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition. | ||
150 | * Added pipeline read mode. As a result, restores | ||
151 | * are now as fast as backups. | ||
152 | * Optimized shared interface behavior. The new behavior | ||
153 | * typically results in better IDE bus efficiency and | ||
154 | * higher tape throughput. | ||
155 | * Pre-calculation of the expected read/write request | ||
156 | * service time, based on the tape's parameters. In | ||
157 | * the pipelined operation mode, this allows us to | ||
158 | * adjust our polling frequency to a much lower value, | ||
159 | * and thus to dramatically reduce our load on Linux, | ||
160 | * without any decrease in performance. | ||
161 | * Implemented additional mtio.h operations. | ||
162 | * The recommended user block size is returned by | ||
163 | * the MTIOCGET ioctl. | ||
164 | * Additional minor changes. | ||
165 | * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the | ||
166 | * use of some block sizes during a restore procedure. | ||
167 | * The character device interface will now present a | ||
168 | * continuous view of the media - any mix of block sizes | ||
169 | * during a backup/restore procedure is supported. The | ||
170 | * driver will buffer the requests internally and | ||
171 | * convert them to the tape's recommended transfer | ||
172 | * unit, making performance almost independent of the | ||
173 | * chosen user block size. | ||
174 | * Some improvements in error recovery. | ||
175 | * By cooperating with ide-dma.c, bus mastering DMA can | ||
176 | * now sometimes be used with IDE tape drives as well. | ||
177 | * Bus mastering DMA has the potential to dramatically | ||
178 | * reduce the CPU's overhead when accessing the device, | ||
179 | * and can be enabled by using hdparm -d1 on the tape's | ||
180 | * block device interface. For more info, read the | ||
181 | * comments in ide-dma.c. | ||
182 | * Ver 1.4 Mar 13 96 Fixed serialize support. | ||
183 | * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85. | ||
184 | * Fixed pipelined read mode inefficiency. | ||
185 | * Fixed nasty null dereferencing bug. | ||
186 | * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver. | ||
187 | * Fixed end of media bug. | ||
188 | * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model. | ||
189 | * Ver 1.8 Sep 26 96 Attempt to find a better balance between good | ||
190 | * interactive response and high system throughput. | ||
191 | * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather | ||
192 | * than requiring an explicit FSF command. | ||
193 | * Abort pending requests at end of media. | ||
194 | * MTTELL was sometimes returning incorrect results. | ||
195 | * Return the real block size in the MTIOCGET ioctl. | ||
196 | * Some error recovery bug fixes. | ||
197 | * Ver 1.10 Nov 5 96 Major reorganization. | ||
198 | * Reduced CPU overhead a bit by eliminating internal | ||
199 | * bounce buffers. | ||
200 | * Added module support. | ||
201 | * Added multiple tape drives support. | ||
202 | * Added partition support. | ||
203 | * Rewrote DSC handling. | ||
204 | * Some portability fixes. | ||
205 | * Removed ide-tape.h. | ||
206 | * Additional minor changes. | ||
207 | * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling. | ||
208 | * Use ide_stall_queue() for DSC overlap. | ||
209 | * Use the maximum speed rather than the current speed | ||
210 | * to compute the request service time. | ||
211 | * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data | ||
212 | * corruption, which could occur if the total number | ||
213 | * of bytes written to the tape was not an integral | ||
214 | * number of tape blocks. | ||
215 | * Add support for INTERRUPT DRQ devices. | ||
216 | * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB | ||
217 | * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives. | ||
218 | * Replace cli()/sti() with hwgroup spinlocks. | ||
219 | * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup | ||
220 | * spinlock with private per-tape spinlock. | ||
221 | * Ver 1.16 Sep 1 99 Add OnStream tape support. | ||
222 | * Abort read pipeline on EOD. | ||
223 | * Wait for the tape to become ready in case it returns | ||
224 | * "in the process of becoming ready" on open(). | ||
225 | * Fix zero padding of the last written block in | ||
226 | * case the tape block size is larger than PAGE_SIZE. | ||
227 | * Decrease the default disconnection time to tn. | ||
228 | * Ver 1.16e Oct 3 99 Minor fixes. | ||
229 | * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen, | ||
230 | * niessen@iae.nl / arnold.niessen@philips.com | ||
231 | * GO-1) Undefined code in idetape_read_position | ||
232 | * according to Gadi's email | ||
233 | * AJN-1) Minor fix asc == 11 should be asc == 0x11 | ||
234 | * in idetape_issue_packet_command (did effect | ||
235 | * debugging output only) | ||
236 | * AJN-2) Added more debugging output, and | ||
237 | * added ide-tape: where missing. I would also | ||
238 | * like to add tape->name where possible | ||
239 | * AJN-3) Added different debug_level's | ||
240 | * via /proc/ide/hdc/settings | ||
241 | * "debug_level" determines amount of debugging output; | ||
242 | * can be changed using /proc/ide/hdx/settings | ||
243 | * 0 : almost no debugging output | ||
244 | * 1 : 0+output errors only | ||
245 | * 2 : 1+output all sensekey/asc | ||
246 | * 3 : 2+follow all chrdev related procedures | ||
247 | * 4 : 3+follow all procedures | ||
248 | * 5 : 4+include pc_stack rq_stack info | ||
249 | * 6 : 5+USE_COUNT updates | ||
250 | * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail | ||
251 | * from 5 to 10 minutes | ||
252 | * AJN-5) Changed maximum number of blocks to skip when | ||
253 | * reading tapes with multiple consecutive write | ||
254 | * errors from 100 to 1000 in idetape_get_logical_blk | ||
255 | * Proposed changes to code: | ||
256 | * 1) output "logical_blk_num" via /proc | ||
257 | * 2) output "current_operation" via /proc | ||
258 | * 3) Either solve or document the fact that `mt rewind' is | ||
259 | * required after reading from /dev/nhtx to be | ||
260 | * able to rmmod the idetape module; | ||
261 | * Also, sometimes an application finishes but the | ||
262 | * device remains `busy' for some time. Same cause ? | ||
263 | * Proposed changes to release-notes: | ||
264 | * 4) write a simple `quickstart' section in the | ||
265 | * release notes; I volunteer if you don't want to | ||
266 | * 5) include a pointer to video4linux in the doc | ||
267 | * to stimulate video applications | ||
268 | * 6) release notes lines 331 and 362: explain what happens | ||
269 | * if the application data rate is higher than 1100 KB/s; | ||
270 | * similar approach to lower-than-500 kB/s ? | ||
271 | * 7) 6.6 Comparison; wouldn't it be better to allow different | ||
272 | * strategies for read and write ? | ||
273 | * Wouldn't it be better to control the tape buffer | ||
274 | * contents instead of the bandwidth ? | ||
275 | * 8) line 536: replace will by would (if I understand | ||
276 | * this section correctly, a hypothetical and unwanted situation | ||
277 | * is being described) | ||
278 | * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames. | ||
279 | * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl | ||
280 | * - Add idetape_onstream_mode_sense_tape_parameter_page | ||
281 | * function to get tape capacity in frames: tape->capacity. | ||
282 | * - Add support for DI-50 drives( or any DI- drive). | ||
283 | * - 'workaround' for read error/blank block around block 3000. | ||
284 | * - Implement Early warning for end of media for Onstream. | ||
285 | * - Cosmetic code changes for readability. | ||
286 | * - Idetape_position_tape should not use SKIP bit during | ||
287 | * Onstream read recovery. | ||
288 | * - Add capacity, logical_blk_num and first/last_frame_position | ||
289 | * to /proc/ide/hd?/settings. | ||
290 | * - Module use count was gone in the Linux 2.4 driver. | ||
291 | * Ver 1.17a Apr 2001 Willem Riede osst@riede.org | ||
292 | * - Get drive's actual block size from mode sense block descriptor | ||
293 | * - Limit size of pipeline | ||
294 | * Ver 1.17b Oct 2002 Alan Stern <stern@rowland.harvard.edu> | ||
295 | * Changed IDETAPE_MIN_PIPELINE_STAGES to 1 and actually used | ||
296 | * it in the code! | ||
297 | * Actually removed aborted stages in idetape_abort_pipeline | ||
298 | * instead of just changing the command code. | ||
299 | * Made the transfer byte count for Request Sense equal to the | ||
300 | * actual length of the data transfer. | ||
301 | * Changed handling of partial data transfers: they do not | ||
302 | * cause DMA errors. | ||
303 | * Moved initiation of DMA transfers to the correct place. | ||
304 | * Removed reference to unallocated memory. | ||
305 | * Made __idetape_discard_read_pipeline return the number of | ||
306 | * sectors skipped, not the number of stages. | ||
307 | * Replaced errant kfree() calls with __idetape_kfree_stage(). | ||
308 | * Fixed off-by-one error in testing the pipeline length. | ||
309 | * Fixed handling of filemarks in the read pipeline. | ||
310 | * Small code optimization for MTBSF and MTBSFM ioctls. | ||
311 | * Don't try to unlock the door during device close if is | ||
312 | * already unlocked! | ||
313 | * Cosmetic fixes to miscellaneous debugging output messages. | ||
314 | * Set the minimum /proc/ide/hd?/settings values for "pipeline", | ||
315 | * "pipeline_min", and "pipeline_max" to 1. | ||
316 | * | ||
317 | * Here are some words from the first releases of hd.c, which are quoted | ||
318 | * in ide.c and apply here as well: | ||
319 | * | ||
320 | * | Special care is recommended. Have Fun! | ||
321 | * | ||
322 | */ | ||
323 | |||
324 | /* | ||
325 | * An overview of the pipelined operation mode. | ||
326 | * | ||
327 | * In the pipelined write mode, we will usually just add requests to our | ||
328 | * pipeline and return immediately, before we even start to service them. The | ||
329 | * user program will then have enough time to prepare the next request while | ||
330 | * we are still busy servicing previous requests. In the pipelined read mode, | ||
331 | * the situation is similar - we add read-ahead requests into the pipeline, | ||
332 | * before the user even requested them. | ||
333 | * | ||
334 | * The pipeline can be viewed as a "safety net" which will be activated when | ||
335 | * the system load is high and prevents the user backup program from keeping up | ||
336 | * with the current tape speed. At this point, the pipeline will get | ||
337 | * shorter and shorter but the tape will still be streaming at the same speed. | ||
338 | * Assuming we have enough pipeline stages, the system load will hopefully | ||
339 | * decrease before the pipeline is completely empty, and the backup program | ||
340 | * will be able to "catch up" and refill the pipeline again. | ||
341 | * | ||
342 | * When using the pipelined mode, it would be best to disable any type of | ||
343 | * buffering done by the user program, as ide-tape already provides all the | ||
344 | * benefits in the kernel, where it can be done in a more efficient way. | ||
345 | * As we will usually not block the user program on a request, the most | ||
346 | * efficient user code will then be a simple read-write-read-... cycle. | ||
347 | * Any additional logic will usually just slow down the backup process. | ||
348 | * | ||
349 | * Using the pipelined mode, I get a constant over 400 KBps throughput, | ||
350 | * which seems to be the maximum throughput supported by my tape. | ||
351 | * | ||
352 | * However, there are some downfalls: | ||
353 | * | ||
354 | * 1. We use memory (for data buffers) in proportional to the number | ||
355 | * of pipeline stages (each stage is about 26 KB with my tape). | ||
356 | * 2. In the pipelined write mode, we cheat and postpone error codes | ||
357 | * to the user task. In read mode, the actual tape position | ||
358 | * will be a bit further than the last requested block. | ||
359 | * | ||
360 | * Concerning (1): | ||
361 | * | ||
362 | * 1. We allocate stages dynamically only when we need them. When | ||
363 | * we don't need them, we don't consume additional memory. In | ||
364 | * case we can't allocate stages, we just manage without them | ||
365 | * (at the expense of decreased throughput) so when Linux is | ||
366 | * tight in memory, we will not pose additional difficulties. | ||
367 | * | ||
368 | * 2. The maximum number of stages (which is, in fact, the maximum | ||
369 | * amount of memory) which we allocate is limited by the compile | ||
370 | * time parameter IDETAPE_MAX_PIPELINE_STAGES. | ||
371 | * | ||
372 | * 3. The maximum number of stages is a controlled parameter - We | ||
373 | * don't start from the user defined maximum number of stages | ||
374 | * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we | ||
375 | * will not even allocate this amount of stages if the user | ||
376 | * program can't handle the speed). We then implement a feedback | ||
377 | * loop which checks if the pipeline is empty, and if it is, we | ||
378 | * increase the maximum number of stages as necessary until we | ||
379 | * reach the optimum value which just manages to keep the tape | ||
380 | * busy with minimum allocated memory or until we reach | ||
381 | * IDETAPE_MAX_PIPELINE_STAGES. | ||
382 | * | ||
383 | * Concerning (2): | ||
384 | * | ||
385 | * In pipelined write mode, ide-tape can not return accurate error codes | ||
386 | * to the user program since we usually just add the request to the | ||
387 | * pipeline without waiting for it to be serviced. In case an error | ||
388 | * occurs, I will report it on the next user request. | ||
389 | * | ||
390 | * In the pipelined read mode, subsequent read requests or forward | ||
391 | * filemark spacing will perform correctly, as we preserve all blocks | ||
392 | * and filemarks which we encountered during our excess read-ahead. | ||
393 | * | ||
394 | * For accurate tape positioning and error reporting, disabling | ||
395 | * pipelined mode might be the best option. | ||
396 | * | ||
397 | * You can enable/disable/tune the pipelined operation mode by adjusting | ||
398 | * the compile time parameters below. | ||
399 | */ | ||
400 | |||
401 | /* | ||
402 | * Possible improvements. | ||
403 | * | ||
404 | * 1. Support for the ATAPI overlap protocol. | ||
405 | * | ||
406 | * In order to maximize bus throughput, we currently use the DSC | ||
407 | * overlap method which enables ide.c to service requests from the | ||
408 | * other device while the tape is busy executing a command. The | ||
409 | * DSC overlap method involves polling the tape's status register | ||
410 | * for the DSC bit, and servicing the other device while the tape | ||
411 | * isn't ready. | ||
412 | * | ||
413 | * In the current QIC development standard (December 1995), | ||
414 | * it is recommended that new tape drives will *in addition* | ||
415 | * implement the ATAPI overlap protocol, which is used for the | ||
416 | * same purpose - efficient use of the IDE bus, but is interrupt | ||
417 | * driven and thus has much less CPU overhead. | ||
418 | * | ||
419 | * ATAPI overlap is likely to be supported in most new ATAPI | ||
420 | * devices, including new ATAPI cdroms, and thus provides us | ||
421 | * a method by which we can achieve higher throughput when | ||
422 | * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. | ||
423 | */ | ||
424 | |||
425 | #define IDETAPE_VERSION "1.19" | ||
426 | |||
427 | #include <linux/config.h> | ||
428 | #include <linux/module.h> | ||
429 | #include <linux/types.h> | ||
430 | #include <linux/string.h> | ||
431 | #include <linux/kernel.h> | ||
432 | #include <linux/delay.h> | ||
433 | #include <linux/timer.h> | ||
434 | #include <linux/mm.h> | ||
435 | #include <linux/interrupt.h> | ||
436 | #include <linux/major.h> | ||
437 | #include <linux/devfs_fs_kernel.h> | ||
438 | #include <linux/errno.h> | ||
439 | #include <linux/genhd.h> | ||
440 | #include <linux/slab.h> | ||
441 | #include <linux/pci.h> | ||
442 | #include <linux/ide.h> | ||
443 | #include <linux/smp_lock.h> | ||
444 | #include <linux/completion.h> | ||
445 | #include <linux/bitops.h> | ||
446 | |||
447 | #include <asm/byteorder.h> | ||
448 | #include <asm/irq.h> | ||
449 | #include <asm/uaccess.h> | ||
450 | #include <asm/io.h> | ||
451 | #include <asm/unaligned.h> | ||
452 | |||
453 | /* | ||
454 | * partition | ||
455 | */ | ||
456 | typedef struct os_partition_s { | ||
457 | __u8 partition_num; | ||
458 | __u8 par_desc_ver; | ||
459 | __u16 wrt_pass_cntr; | ||
460 | __u32 first_frame_addr; | ||
461 | __u32 last_frame_addr; | ||
462 | __u32 eod_frame_addr; | ||
463 | } os_partition_t; | ||
464 | |||
465 | /* | ||
466 | * DAT entry | ||
467 | */ | ||
468 | typedef struct os_dat_entry_s { | ||
469 | __u32 blk_sz; | ||
470 | __u16 blk_cnt; | ||
471 | __u8 flags; | ||
472 | __u8 reserved; | ||
473 | } os_dat_entry_t; | ||
474 | |||
475 | /* | ||
476 | * DAT | ||
477 | */ | ||
478 | #define OS_DAT_FLAGS_DATA (0xc) | ||
479 | #define OS_DAT_FLAGS_MARK (0x1) | ||
480 | |||
481 | typedef struct os_dat_s { | ||
482 | __u8 dat_sz; | ||
483 | __u8 reserved1; | ||
484 | __u8 entry_cnt; | ||
485 | __u8 reserved3; | ||
486 | os_dat_entry_t dat_list[16]; | ||
487 | } os_dat_t; | ||
488 | |||
489 | #include <linux/mtio.h> | ||
490 | |||
491 | /**************************** Tunable parameters *****************************/ | ||
492 | |||
493 | |||
494 | /* | ||
495 | * Pipelined mode parameters. | ||
496 | * | ||
497 | * We try to use the minimum number of stages which is enough to | ||
498 | * keep the tape constantly streaming. To accomplish that, we implement | ||
499 | * a feedback loop around the maximum number of stages: | ||
500 | * | ||
501 | * We start from MIN maximum stages (we will not even use MIN stages | ||
502 | * if we don't need them), increment it by RATE*(MAX-MIN) | ||
503 | * whenever we sense that the pipeline is empty, until we reach | ||
504 | * the optimum value or until we reach MAX. | ||
505 | * | ||
506 | * Setting the following parameter to 0 is illegal: the pipelined mode | ||
507 | * cannot be disabled (calculate_speeds() divides by tape->max_stages.) | ||
508 | */ | ||
509 | #define IDETAPE_MIN_PIPELINE_STAGES 1 | ||
510 | #define IDETAPE_MAX_PIPELINE_STAGES 400 | ||
511 | #define IDETAPE_INCREASE_STAGES_RATE 20 | ||
512 | |||
513 | /* | ||
514 | * The following are used to debug the driver: | ||
515 | * | ||
516 | * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. | ||
517 | * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. | ||
518 | * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in | ||
519 | * some places. | ||
520 | * | ||
521 | * Setting them to 0 will restore normal operation mode: | ||
522 | * | ||
523 | * 1. Disable logging normal successful operations. | ||
524 | * 2. Disable self-sanity checks. | ||
525 | * 3. Errors will still be logged, of course. | ||
526 | * | ||
527 | * All the #if DEBUG code will be removed some day, when the driver | ||
528 | * is verified to be stable enough. This will make it much more | ||
529 | * esthetic. | ||
530 | */ | ||
531 | #define IDETAPE_DEBUG_INFO 0 | ||
532 | #define IDETAPE_DEBUG_LOG 0 | ||
533 | #define IDETAPE_DEBUG_BUGS 1 | ||
534 | |||
535 | /* | ||
536 | * After each failed packet command we issue a request sense command | ||
537 | * and retry the packet command IDETAPE_MAX_PC_RETRIES times. | ||
538 | * | ||
539 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. | ||
540 | */ | ||
541 | #define IDETAPE_MAX_PC_RETRIES 3 | ||
542 | |||
543 | /* | ||
544 | * With each packet command, we allocate a buffer of | ||
545 | * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet | ||
546 | * commands (Not for READ/WRITE commands). | ||
547 | */ | ||
548 | #define IDETAPE_PC_BUFFER_SIZE 256 | ||
549 | |||
550 | /* | ||
551 | * In various places in the driver, we need to allocate storage | ||
552 | * for packet commands and requests, which will remain valid while | ||
553 | * we leave the driver to wait for an interrupt or a timeout event. | ||
554 | */ | ||
555 | #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) | ||
556 | |||
557 | /* | ||
558 | * Some drives (for example, Seagate STT3401A Travan) require a very long | ||
559 | * timeout, because they don't return an interrupt or clear their busy bit | ||
560 | * until after the command completes (even retension commands). | ||
561 | */ | ||
562 | #define IDETAPE_WAIT_CMD (900*HZ) | ||
563 | |||
564 | /* | ||
565 | * The following parameter is used to select the point in the internal | ||
566 | * tape fifo in which we will start to refill the buffer. Decreasing | ||
567 | * the following parameter will improve the system's latency and | ||
568 | * interactive response, while using a high value might improve sytem | ||
569 | * throughput. | ||
570 | */ | ||
571 | #define IDETAPE_FIFO_THRESHOLD 2 | ||
572 | |||
573 | /* | ||
574 | * DSC polling parameters. | ||
575 | * | ||
576 | * Polling for DSC (a single bit in the status register) is a very | ||
577 | * important function in ide-tape. There are two cases in which we | ||
578 | * poll for DSC: | ||
579 | * | ||
580 | * 1. Before a read/write packet command, to ensure that we | ||
581 | * can transfer data from/to the tape's data buffers, without | ||
582 | * causing an actual media access. In case the tape is not | ||
583 | * ready yet, we take out our request from the device | ||
584 | * request queue, so that ide.c will service requests from | ||
585 | * the other device on the same interface meanwhile. | ||
586 | * | ||
587 | * 2. After the successful initialization of a "media access | ||
588 | * packet command", which is a command which can take a long | ||
589 | * time to complete (it can be several seconds or even an hour). | ||
590 | * | ||
591 | * Again, we postpone our request in the middle to free the bus | ||
592 | * for the other device. The polling frequency here should be | ||
593 | * lower than the read/write frequency since those media access | ||
594 | * commands are slow. We start from a "fast" frequency - | ||
595 | * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC | ||
596 | * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a | ||
597 | * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). | ||
598 | * | ||
599 | * We also set a timeout for the timer, in case something goes wrong. | ||
600 | * The timeout should be longer then the maximum execution time of a | ||
601 | * tape operation. | ||
602 | */ | ||
603 | |||
604 | /* | ||
605 | * DSC timings. | ||
606 | */ | ||
607 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ | ||
608 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | ||
609 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | ||
610 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | ||
611 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | ||
612 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | ||
613 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | ||
614 | |||
615 | /*************************** End of tunable parameters ***********************/ | ||
616 | |||
617 | /* | ||
618 | * Debugging/Performance analysis | ||
619 | * | ||
620 | * I/O trace support | ||
621 | */ | ||
622 | #define USE_IOTRACE 0 | ||
623 | #if USE_IOTRACE | ||
624 | #include <linux/io_trace.h> | ||
625 | #define IO_IDETAPE_FIFO 500 | ||
626 | #endif | ||
627 | |||
628 | /* | ||
629 | * Read/Write error simulation | ||
630 | */ | ||
631 | #define SIMULATE_ERRORS 0 | ||
632 | |||
633 | /* | ||
634 | * For general magnetic tape device compatibility. | ||
635 | */ | ||
636 | typedef enum { | ||
637 | idetape_direction_none, | ||
638 | idetape_direction_read, | ||
639 | idetape_direction_write | ||
640 | } idetape_chrdev_direction_t; | ||
641 | |||
642 | struct idetape_bh { | ||
643 | unsigned short b_size; | ||
644 | atomic_t b_count; | ||
645 | struct idetape_bh *b_reqnext; | ||
646 | char *b_data; | ||
647 | }; | ||
648 | |||
649 | /* | ||
650 | * Our view of a packet command. | ||
651 | */ | ||
652 | typedef struct idetape_packet_command_s { | ||
653 | u8 c[12]; /* Actual packet bytes */ | ||
654 | int retries; /* On each retry, we increment retries */ | ||
655 | int error; /* Error code */ | ||
656 | int request_transfer; /* Bytes to transfer */ | ||
657 | int actually_transferred; /* Bytes actually transferred */ | ||
658 | int buffer_size; /* Size of our data buffer */ | ||
659 | struct idetape_bh *bh; | ||
660 | char *b_data; | ||
661 | int b_count; | ||
662 | u8 *buffer; /* Data buffer */ | ||
663 | u8 *current_position; /* Pointer into the above buffer */ | ||
664 | ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ | ||
665 | u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ | ||
666 | unsigned long flags; /* Status/Action bit flags: long for set_bit */ | ||
667 | } idetape_pc_t; | ||
668 | |||
669 | /* | ||
670 | * Packet command flag bits. | ||
671 | */ | ||
672 | /* Set when an error is considered normal - We won't retry */ | ||
673 | #define PC_ABORT 0 | ||
674 | /* 1 When polling for DSC on a media access command */ | ||
675 | #define PC_WAIT_FOR_DSC 1 | ||
676 | /* 1 when we prefer to use DMA if possible */ | ||
677 | #define PC_DMA_RECOMMENDED 2 | ||
678 | /* 1 while DMA in progress */ | ||
679 | #define PC_DMA_IN_PROGRESS 3 | ||
680 | /* 1 when encountered problem during DMA */ | ||
681 | #define PC_DMA_ERROR 4 | ||
682 | /* Data direction */ | ||
683 | #define PC_WRITING 5 | ||
684 | |||
685 | /* | ||
686 | * Capabilities and Mechanical Status Page | ||
687 | */ | ||
688 | typedef struct { | ||
689 | unsigned page_code :6; /* Page code - Should be 0x2a */ | ||
690 | __u8 reserved0_6 :1; | ||
691 | __u8 ps :1; /* parameters saveable */ | ||
692 | __u8 page_length; /* Page Length - Should be 0x12 */ | ||
693 | __u8 reserved2, reserved3; | ||
694 | unsigned ro :1; /* Read Only Mode */ | ||
695 | unsigned reserved4_1234 :4; | ||
696 | unsigned sprev :1; /* Supports SPACE in the reverse direction */ | ||
697 | unsigned reserved4_67 :2; | ||
698 | unsigned reserved5_012 :3; | ||
699 | unsigned efmt :1; /* Supports ERASE command initiated formatting */ | ||
700 | unsigned reserved5_4 :1; | ||
701 | unsigned qfa :1; /* Supports the QFA two partition formats */ | ||
702 | unsigned reserved5_67 :2; | ||
703 | unsigned lock :1; /* Supports locking the volume */ | ||
704 | unsigned locked :1; /* The volume is locked */ | ||
705 | unsigned prevent :1; /* The device defaults in the prevent state after power up */ | ||
706 | unsigned eject :1; /* The device can eject the volume */ | ||
707 | __u8 disconnect :1; /* The device can break request > ctl */ | ||
708 | __u8 reserved6_5 :1; | ||
709 | unsigned ecc :1; /* Supports error correction */ | ||
710 | unsigned cmprs :1; /* Supports data compression */ | ||
711 | unsigned reserved7_0 :1; | ||
712 | unsigned blk512 :1; /* Supports 512 bytes block size */ | ||
713 | unsigned blk1024 :1; /* Supports 1024 bytes block size */ | ||
714 | unsigned reserved7_3_6 :4; | ||
715 | unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ | ||
716 | /* transfers for slow buffer memory ??? */ | ||
717 | /* Also 32768 block size in some cases */ | ||
718 | __u16 max_speed; /* Maximum speed supported in KBps */ | ||
719 | __u8 reserved10, reserved11; | ||
720 | __u16 ctl; /* Continuous Transfer Limit in blocks */ | ||
721 | __u16 speed; /* Current Speed, in KBps */ | ||
722 | __u16 buffer_size; /* Buffer Size, in 512 bytes */ | ||
723 | __u8 reserved18, reserved19; | ||
724 | } idetape_capabilities_page_t; | ||
725 | |||
726 | /* | ||
727 | * Block Size Page | ||
728 | */ | ||
729 | typedef struct { | ||
730 | unsigned page_code :6; /* Page code - Should be 0x30 */ | ||
731 | unsigned reserved1_6 :1; | ||
732 | unsigned ps :1; | ||
733 | __u8 page_length; /* Page Length - Should be 2 */ | ||
734 | __u8 reserved2; | ||
735 | unsigned play32 :1; | ||
736 | unsigned play32_5 :1; | ||
737 | unsigned reserved2_23 :2; | ||
738 | unsigned record32 :1; | ||
739 | unsigned record32_5 :1; | ||
740 | unsigned reserved2_6 :1; | ||
741 | unsigned one :1; | ||
742 | } idetape_block_size_page_t; | ||
743 | |||
744 | /* | ||
745 | * A pipeline stage. | ||
746 | */ | ||
747 | typedef struct idetape_stage_s { | ||
748 | struct request rq; /* The corresponding request */ | ||
749 | struct idetape_bh *bh; /* The data buffers */ | ||
750 | struct idetape_stage_s *next; /* Pointer to the next stage */ | ||
751 | } idetape_stage_t; | ||
752 | |||
753 | /* | ||
754 | * REQUEST SENSE packet command result - Data Format. | ||
755 | */ | ||
756 | typedef struct { | ||
757 | unsigned error_code :7; /* Current of deferred errors */ | ||
758 | unsigned valid :1; /* The information field conforms to QIC-157C */ | ||
759 | __u8 reserved1 :8; /* Segment Number - Reserved */ | ||
760 | unsigned sense_key :4; /* Sense Key */ | ||
761 | unsigned reserved2_4 :1; /* Reserved */ | ||
762 | unsigned ili :1; /* Incorrect Length Indicator */ | ||
763 | unsigned eom :1; /* End Of Medium */ | ||
764 | unsigned filemark :1; /* Filemark */ | ||
765 | __u32 information __attribute__ ((packed)); | ||
766 | __u8 asl; /* Additional sense length (n-7) */ | ||
767 | __u32 command_specific; /* Additional command specific information */ | ||
768 | __u8 asc; /* Additional Sense Code */ | ||
769 | __u8 ascq; /* Additional Sense Code Qualifier */ | ||
770 | __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ | ||
771 | unsigned sk_specific1 :7; /* Sense Key Specific */ | ||
772 | unsigned sksv :1; /* Sense Key Specific information is valid */ | ||
773 | __u8 sk_specific2; /* Sense Key Specific */ | ||
774 | __u8 sk_specific3; /* Sense Key Specific */ | ||
775 | __u8 pad[2]; /* Padding to 20 bytes */ | ||
776 | } idetape_request_sense_result_t; | ||
777 | |||
778 | |||
779 | /* | ||
780 | * Most of our global data which we need to save even as we leave the | ||
781 | * driver due to an interrupt or a timer event is stored in a variable | ||
782 | * of type idetape_tape_t, defined below. | ||
783 | */ | ||
784 | typedef struct ide_tape_obj { | ||
785 | ide_drive_t *drive; | ||
786 | ide_driver_t *driver; | ||
787 | struct gendisk *disk; | ||
788 | struct kref kref; | ||
789 | |||
790 | /* | ||
791 | * Since a typical character device operation requires more | ||
792 | * than one packet command, we provide here enough memory | ||
793 | * for the maximum of interconnected packet commands. | ||
794 | * The packet commands are stored in the circular array pc_stack. | ||
795 | * pc_stack_index points to the last used entry, and warps around | ||
796 | * to the start when we get to the last array entry. | ||
797 | * | ||
798 | * pc points to the current processed packet command. | ||
799 | * | ||
800 | * failed_pc points to the last failed packet command, or contains | ||
801 | * NULL if we do not need to retry any packet command. This is | ||
802 | * required since an additional packet command is needed before the | ||
803 | * retry, to get detailed information on what went wrong. | ||
804 | */ | ||
805 | /* Current packet command */ | ||
806 | idetape_pc_t *pc; | ||
807 | /* Last failed packet command */ | ||
808 | idetape_pc_t *failed_pc; | ||
809 | /* Packet command stack */ | ||
810 | idetape_pc_t pc_stack[IDETAPE_PC_STACK]; | ||
811 | /* Next free packet command storage space */ | ||
812 | int pc_stack_index; | ||
813 | struct request rq_stack[IDETAPE_PC_STACK]; | ||
814 | /* We implement a circular array */ | ||
815 | int rq_stack_index; | ||
816 | |||
817 | /* | ||
818 | * DSC polling variables. | ||
819 | * | ||
820 | * While polling for DSC we use postponed_rq to postpone the | ||
821 | * current request so that ide.c will be able to service | ||
822 | * pending requests on the other device. Note that at most | ||
823 | * we will have only one DSC (usually data transfer) request | ||
824 | * in the device request queue. Additional requests can be | ||
825 | * queued in our internal pipeline, but they will be visible | ||
826 | * to ide.c only one at a time. | ||
827 | */ | ||
828 | struct request *postponed_rq; | ||
829 | /* The time in which we started polling for DSC */ | ||
830 | unsigned long dsc_polling_start; | ||
831 | /* Timer used to poll for dsc */ | ||
832 | struct timer_list dsc_timer; | ||
833 | /* Read/Write dsc polling frequency */ | ||
834 | unsigned long best_dsc_rw_frequency; | ||
835 | /* The current polling frequency */ | ||
836 | unsigned long dsc_polling_frequency; | ||
837 | /* Maximum waiting time */ | ||
838 | unsigned long dsc_timeout; | ||
839 | |||
840 | /* | ||
841 | * Read position information | ||
842 | */ | ||
843 | u8 partition; | ||
844 | /* Current block */ | ||
845 | unsigned int first_frame_position; | ||
846 | unsigned int last_frame_position; | ||
847 | unsigned int blocks_in_buffer; | ||
848 | |||
849 | /* | ||
850 | * Last error information | ||
851 | */ | ||
852 | u8 sense_key, asc, ascq; | ||
853 | |||
854 | /* | ||
855 | * Character device operation | ||
856 | */ | ||
857 | unsigned int minor; | ||
858 | /* device name */ | ||
859 | char name[4]; | ||
860 | /* Current character device data transfer direction */ | ||
861 | idetape_chrdev_direction_t chrdev_direction; | ||
862 | |||
863 | /* | ||
864 | * Device information | ||
865 | */ | ||
866 | /* Usually 512 or 1024 bytes */ | ||
867 | unsigned short tape_block_size; | ||
868 | int user_bs_factor; | ||
869 | /* Copy of the tape's Capabilities and Mechanical Page */ | ||
870 | idetape_capabilities_page_t capabilities; | ||
871 | |||
872 | /* | ||
873 | * Active data transfer request parameters. | ||
874 | * | ||
875 | * At most, there is only one ide-tape originated data transfer | ||
876 | * request in the device request queue. This allows ide.c to | ||
877 | * easily service requests from the other device when we | ||
878 | * postpone our active request. In the pipelined operation | ||
879 | * mode, we use our internal pipeline structure to hold | ||
880 | * more data requests. | ||
881 | * | ||
882 | * The data buffer size is chosen based on the tape's | ||
883 | * recommendation. | ||
884 | */ | ||
885 | /* Pointer to the request which is waiting in the device request queue */ | ||
886 | struct request *active_data_request; | ||
887 | /* Data buffer size (chosen based on the tape's recommendation */ | ||
888 | int stage_size; | ||
889 | idetape_stage_t *merge_stage; | ||
890 | int merge_stage_size; | ||
891 | struct idetape_bh *bh; | ||
892 | char *b_data; | ||
893 | int b_count; | ||
894 | |||
895 | /* | ||
896 | * Pipeline parameters. | ||
897 | * | ||
898 | * To accomplish non-pipelined mode, we simply set the following | ||
899 | * variables to zero (or NULL, where appropriate). | ||
900 | */ | ||
901 | /* Number of currently used stages */ | ||
902 | int nr_stages; | ||
903 | /* Number of pending stages */ | ||
904 | int nr_pending_stages; | ||
905 | /* We will not allocate more than this number of stages */ | ||
906 | int max_stages, min_pipeline, max_pipeline; | ||
907 | /* The first stage which will be removed from the pipeline */ | ||
908 | idetape_stage_t *first_stage; | ||
909 | /* The currently active stage */ | ||
910 | idetape_stage_t *active_stage; | ||
911 | /* Will be serviced after the currently active request */ | ||
912 | idetape_stage_t *next_stage; | ||
913 | /* New requests will be added to the pipeline here */ | ||
914 | idetape_stage_t *last_stage; | ||
915 | /* Optional free stage which we can use */ | ||
916 | idetape_stage_t *cache_stage; | ||
917 | int pages_per_stage; | ||
918 | /* Wasted space in each stage */ | ||
919 | int excess_bh_size; | ||
920 | |||
921 | /* Status/Action flags: long for set_bit */ | ||
922 | unsigned long flags; | ||
923 | /* protects the ide-tape queue */ | ||
924 | spinlock_t spinlock; | ||
925 | |||
926 | /* | ||
927 | * Measures average tape speed | ||
928 | */ | ||
929 | unsigned long avg_time; | ||
930 | int avg_size; | ||
931 | int avg_speed; | ||
932 | |||
933 | /* last sense information */ | ||
934 | idetape_request_sense_result_t sense; | ||
935 | |||
936 | char vendor_id[10]; | ||
937 | char product_id[18]; | ||
938 | char firmware_revision[6]; | ||
939 | int firmware_revision_num; | ||
940 | |||
941 | /* the door is currently locked */ | ||
942 | int door_locked; | ||
943 | /* the tape hardware is write protected */ | ||
944 | char drv_write_prot; | ||
945 | /* the tape is write protected (hardware or opened as read-only) */ | ||
946 | char write_prot; | ||
947 | |||
948 | /* | ||
949 | * Limit the number of times a request can | ||
950 | * be postponed, to avoid an infinite postpone | ||
951 | * deadlock. | ||
952 | */ | ||
953 | /* request postpone count limit */ | ||
954 | int postpone_cnt; | ||
955 | |||
956 | /* | ||
957 | * Measures number of frames: | ||
958 | * | ||
959 | * 1. written/read to/from the driver pipeline (pipeline_head). | ||
960 | * 2. written/read to/from the tape buffers (idetape_bh). | ||
961 | * 3. written/read by the tape to/from the media (tape_head). | ||
962 | */ | ||
963 | int pipeline_head; | ||
964 | int buffer_head; | ||
965 | int tape_head; | ||
966 | int last_tape_head; | ||
967 | |||
968 | /* | ||
969 | * Speed control at the tape buffers input/output | ||
970 | */ | ||
971 | unsigned long insert_time; | ||
972 | int insert_size; | ||
973 | int insert_speed; | ||
974 | int max_insert_speed; | ||
975 | int measure_insert_time; | ||
976 | |||
977 | /* | ||
978 | * Measure tape still time, in milliseconds | ||
979 | */ | ||
980 | unsigned long tape_still_time_begin; | ||
981 | int tape_still_time; | ||
982 | |||
983 | /* | ||
984 | * Speed regulation negative feedback loop | ||
985 | */ | ||
986 | int speed_control; | ||
987 | int pipeline_head_speed; | ||
988 | int controlled_pipeline_head_speed; | ||
989 | int uncontrolled_pipeline_head_speed; | ||
990 | int controlled_last_pipeline_head; | ||
991 | int uncontrolled_last_pipeline_head; | ||
992 | unsigned long uncontrolled_pipeline_head_time; | ||
993 | unsigned long controlled_pipeline_head_time; | ||
994 | int controlled_previous_pipeline_head; | ||
995 | int uncontrolled_previous_pipeline_head; | ||
996 | unsigned long controlled_previous_head_time; | ||
997 | unsigned long uncontrolled_previous_head_time; | ||
998 | int restart_speed_control_req; | ||
999 | |||
1000 | /* | ||
1001 | * Debug_level determines amount of debugging output; | ||
1002 | * can be changed using /proc/ide/hdx/settings | ||
1003 | * 0 : almost no debugging output | ||
1004 | * 1 : 0+output errors only | ||
1005 | * 2 : 1+output all sensekey/asc | ||
1006 | * 3 : 2+follow all chrdev related procedures | ||
1007 | * 4 : 3+follow all procedures | ||
1008 | * 5 : 4+include pc_stack rq_stack info | ||
1009 | * 6 : 5+USE_COUNT updates | ||
1010 | */ | ||
1011 | int debug_level; | ||
1012 | } idetape_tape_t; | ||
1013 | |||
1014 | static DECLARE_MUTEX(idetape_ref_sem); | ||
1015 | |||
1016 | #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref) | ||
1017 | |||
1018 | #define ide_tape_g(disk) \ | ||
1019 | container_of((disk)->private_data, struct ide_tape_obj, driver) | ||
1020 | |||
1021 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) | ||
1022 | { | ||
1023 | struct ide_tape_obj *tape = NULL; | ||
1024 | |||
1025 | down(&idetape_ref_sem); | ||
1026 | tape = ide_tape_g(disk); | ||
1027 | if (tape) | ||
1028 | kref_get(&tape->kref); | ||
1029 | up(&idetape_ref_sem); | ||
1030 | return tape; | ||
1031 | } | ||
1032 | |||
1033 | static void ide_tape_release(struct kref *); | ||
1034 | |||
1035 | static void ide_tape_put(struct ide_tape_obj *tape) | ||
1036 | { | ||
1037 | down(&idetape_ref_sem); | ||
1038 | kref_put(&tape->kref, ide_tape_release); | ||
1039 | up(&idetape_ref_sem); | ||
1040 | } | ||
1041 | |||
1042 | /* | ||
1043 | * Tape door status | ||
1044 | */ | ||
1045 | #define DOOR_UNLOCKED 0 | ||
1046 | #define DOOR_LOCKED 1 | ||
1047 | #define DOOR_EXPLICITLY_LOCKED 2 | ||
1048 | |||
1049 | /* | ||
1050 | * Tape flag bits values. | ||
1051 | */ | ||
1052 | #define IDETAPE_IGNORE_DSC 0 | ||
1053 | #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ | ||
1054 | #define IDETAPE_BUSY 2 /* Device already opened */ | ||
1055 | #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ | ||
1056 | #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ | ||
1057 | #define IDETAPE_FILEMARK 5 /* Currently on a filemark */ | ||
1058 | #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ | ||
1059 | #define IDETAPE_READ_ERROR 7 | ||
1060 | #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ | ||
1061 | /* 0 = no tape is loaded, so we don't rewind after ejecting */ | ||
1062 | #define IDETAPE_MEDIUM_PRESENT 9 | ||
1063 | |||
1064 | /* | ||
1065 | * Supported ATAPI tape drives packet commands | ||
1066 | */ | ||
1067 | #define IDETAPE_TEST_UNIT_READY_CMD 0x00 | ||
1068 | #define IDETAPE_REWIND_CMD 0x01 | ||
1069 | #define IDETAPE_REQUEST_SENSE_CMD 0x03 | ||
1070 | #define IDETAPE_READ_CMD 0x08 | ||
1071 | #define IDETAPE_WRITE_CMD 0x0a | ||
1072 | #define IDETAPE_WRITE_FILEMARK_CMD 0x10 | ||
1073 | #define IDETAPE_SPACE_CMD 0x11 | ||
1074 | #define IDETAPE_INQUIRY_CMD 0x12 | ||
1075 | #define IDETAPE_ERASE_CMD 0x19 | ||
1076 | #define IDETAPE_MODE_SENSE_CMD 0x1a | ||
1077 | #define IDETAPE_MODE_SELECT_CMD 0x15 | ||
1078 | #define IDETAPE_LOAD_UNLOAD_CMD 0x1b | ||
1079 | #define IDETAPE_PREVENT_CMD 0x1e | ||
1080 | #define IDETAPE_LOCATE_CMD 0x2b | ||
1081 | #define IDETAPE_READ_POSITION_CMD 0x34 | ||
1082 | #define IDETAPE_READ_BUFFER_CMD 0x3c | ||
1083 | #define IDETAPE_SET_SPEED_CMD 0xbb | ||
1084 | |||
1085 | /* | ||
1086 | * Some defines for the READ BUFFER command | ||
1087 | */ | ||
1088 | #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 | ||
1089 | |||
1090 | /* | ||
1091 | * Some defines for the SPACE command | ||
1092 | */ | ||
1093 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | ||
1094 | #define IDETAPE_SPACE_TO_EOD 3 | ||
1095 | |||
1096 | /* | ||
1097 | * Some defines for the LOAD UNLOAD command | ||
1098 | */ | ||
1099 | #define IDETAPE_LU_LOAD_MASK 1 | ||
1100 | #define IDETAPE_LU_RETENSION_MASK 2 | ||
1101 | #define IDETAPE_LU_EOT_MASK 4 | ||
1102 | |||
1103 | /* | ||
1104 | * Special requests for our block device strategy routine. | ||
1105 | * | ||
1106 | * In order to service a character device command, we add special | ||
1107 | * requests to the tail of our block device request queue and wait | ||
1108 | * for their completion. | ||
1109 | */ | ||
1110 | |||
1111 | enum { | ||
1112 | REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */ | ||
1113 | REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */ | ||
1114 | REQ_IDETAPE_READ = (1 << 2), | ||
1115 | REQ_IDETAPE_WRITE = (1 << 3), | ||
1116 | REQ_IDETAPE_READ_BUFFER = (1 << 4), | ||
1117 | }; | ||
1118 | |||
1119 | /* | ||
1120 | * Error codes which are returned in rq->errors to the higher part | ||
1121 | * of the driver. | ||
1122 | */ | ||
1123 | #define IDETAPE_ERROR_GENERAL 101 | ||
1124 | #define IDETAPE_ERROR_FILEMARK 102 | ||
1125 | #define IDETAPE_ERROR_EOD 103 | ||
1126 | |||
1127 | /* | ||
1128 | * The following is used to format the general configuration word of | ||
1129 | * the ATAPI IDENTIFY DEVICE command. | ||
1130 | */ | ||
1131 | struct idetape_id_gcw { | ||
1132 | unsigned packet_size :2; /* Packet Size */ | ||
1133 | unsigned reserved234 :3; /* Reserved */ | ||
1134 | unsigned drq_type :2; /* Command packet DRQ type */ | ||
1135 | unsigned removable :1; /* Removable media */ | ||
1136 | unsigned device_type :5; /* Device type */ | ||
1137 | unsigned reserved13 :1; /* Reserved */ | ||
1138 | unsigned protocol :2; /* Protocol type */ | ||
1139 | }; | ||
1140 | |||
1141 | /* | ||
1142 | * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) | ||
1143 | */ | ||
1144 | typedef struct { | ||
1145 | unsigned device_type :5; /* Peripheral Device Type */ | ||
1146 | unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ | ||
1147 | unsigned reserved1_6t0 :7; /* Reserved */ | ||
1148 | unsigned rmb :1; /* Removable Medium Bit */ | ||
1149 | unsigned ansi_version :3; /* ANSI Version */ | ||
1150 | unsigned ecma_version :3; /* ECMA Version */ | ||
1151 | unsigned iso_version :2; /* ISO Version */ | ||
1152 | unsigned response_format :4; /* Response Data Format */ | ||
1153 | unsigned reserved3_45 :2; /* Reserved */ | ||
1154 | unsigned reserved3_6 :1; /* TrmIOP - Reserved */ | ||
1155 | unsigned reserved3_7 :1; /* AENC - Reserved */ | ||
1156 | __u8 additional_length; /* Additional Length (total_length-4) */ | ||
1157 | __u8 rsv5, rsv6, rsv7; /* Reserved */ | ||
1158 | __u8 vendor_id[8]; /* Vendor Identification */ | ||
1159 | __u8 product_id[16]; /* Product Identification */ | ||
1160 | __u8 revision_level[4]; /* Revision Level */ | ||
1161 | __u8 vendor_specific[20]; /* Vendor Specific - Optional */ | ||
1162 | __u8 reserved56t95[40]; /* Reserved - Optional */ | ||
1163 | /* Additional information may be returned */ | ||
1164 | } idetape_inquiry_result_t; | ||
1165 | |||
1166 | /* | ||
1167 | * READ POSITION packet command - Data Format (From Table 6-57) | ||
1168 | */ | ||
1169 | typedef struct { | ||
1170 | unsigned reserved0_10 :2; /* Reserved */ | ||
1171 | unsigned bpu :1; /* Block Position Unknown */ | ||
1172 | unsigned reserved0_543 :3; /* Reserved */ | ||
1173 | unsigned eop :1; /* End Of Partition */ | ||
1174 | unsigned bop :1; /* Beginning Of Partition */ | ||
1175 | u8 partition; /* Partition Number */ | ||
1176 | u8 reserved2, reserved3; /* Reserved */ | ||
1177 | u32 first_block; /* First Block Location */ | ||
1178 | u32 last_block; /* Last Block Location (Optional) */ | ||
1179 | u8 reserved12; /* Reserved */ | ||
1180 | u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ | ||
1181 | u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ | ||
1182 | } idetape_read_position_result_t; | ||
1183 | |||
1184 | /* | ||
1185 | * Follows structures which are related to the SELECT SENSE / MODE SENSE | ||
1186 | * packet commands. Those packet commands are still not supported | ||
1187 | * by ide-tape. | ||
1188 | */ | ||
1189 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | ||
1190 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | ||
1191 | #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ | ||
1192 | #define IDETAPE_BLOCK_SIZE_PAGE 0x30 | ||
1193 | #define IDETAPE_BUFFER_FILLING_PAGE 0x33 | ||
1194 | |||
1195 | /* | ||
1196 | * Mode Parameter Header for the MODE SENSE packet command | ||
1197 | */ | ||
1198 | typedef struct { | ||
1199 | __u8 mode_data_length; /* Length of the following data transfer */ | ||
1200 | __u8 medium_type; /* Medium Type */ | ||
1201 | __u8 dsp; /* Device Specific Parameter */ | ||
1202 | __u8 bdl; /* Block Descriptor Length */ | ||
1203 | #if 0 | ||
1204 | /* data transfer page */ | ||
1205 | __u8 page_code :6; | ||
1206 | __u8 reserved0_6 :1; | ||
1207 | __u8 ps :1; /* parameters saveable */ | ||
1208 | __u8 page_length; /* page Length == 0x02 */ | ||
1209 | __u8 reserved2; | ||
1210 | __u8 read32k :1; /* 32k blk size (data only) */ | ||
1211 | __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */ | ||
1212 | __u8 reserved3_23 :2; | ||
1213 | __u8 write32k :1; /* 32k blk size (data only) */ | ||
1214 | __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */ | ||
1215 | __u8 reserved3_6 :1; | ||
1216 | __u8 streaming :1; /* streaming mode enable */ | ||
1217 | #endif | ||
1218 | } idetape_mode_parameter_header_t; | ||
1219 | |||
1220 | /* | ||
1221 | * Mode Parameter Block Descriptor the MODE SENSE packet command | ||
1222 | * | ||
1223 | * Support for block descriptors is optional. | ||
1224 | */ | ||
1225 | typedef struct { | ||
1226 | __u8 density_code; /* Medium density code */ | ||
1227 | __u8 blocks[3]; /* Number of blocks */ | ||
1228 | __u8 reserved4; /* Reserved */ | ||
1229 | __u8 length[3]; /* Block Length */ | ||
1230 | } idetape_parameter_block_descriptor_t; | ||
1231 | |||
1232 | /* | ||
1233 | * The Data Compression Page, as returned by the MODE SENSE packet command. | ||
1234 | */ | ||
1235 | typedef struct { | ||
1236 | unsigned page_code :6; /* Page Code - Should be 0xf */ | ||
1237 | unsigned reserved0 :1; /* Reserved */ | ||
1238 | unsigned ps :1; | ||
1239 | __u8 page_length; /* Page Length - Should be 14 */ | ||
1240 | unsigned reserved2 :6; /* Reserved */ | ||
1241 | unsigned dcc :1; /* Data Compression Capable */ | ||
1242 | unsigned dce :1; /* Data Compression Enable */ | ||
1243 | unsigned reserved3 :5; /* Reserved */ | ||
1244 | unsigned red :2; /* Report Exception on Decompression */ | ||
1245 | unsigned dde :1; /* Data Decompression Enable */ | ||
1246 | __u32 ca; /* Compression Algorithm */ | ||
1247 | __u32 da; /* Decompression Algorithm */ | ||
1248 | __u8 reserved[4]; /* Reserved */ | ||
1249 | } idetape_data_compression_page_t; | ||
1250 | |||
1251 | /* | ||
1252 | * The Medium Partition Page, as returned by the MODE SENSE packet command. | ||
1253 | */ | ||
1254 | typedef struct { | ||
1255 | unsigned page_code :6; /* Page Code - Should be 0x11 */ | ||
1256 | unsigned reserved1_6 :1; /* Reserved */ | ||
1257 | unsigned ps :1; | ||
1258 | __u8 page_length; /* Page Length - Should be 6 */ | ||
1259 | __u8 map; /* Maximum Additional Partitions - Should be 0 */ | ||
1260 | __u8 apd; /* Additional Partitions Defined - Should be 0 */ | ||
1261 | unsigned reserved4_012 :3; /* Reserved */ | ||
1262 | unsigned psum :2; /* Should be 0 */ | ||
1263 | unsigned idp :1; /* Should be 0 */ | ||
1264 | unsigned sdp :1; /* Should be 0 */ | ||
1265 | unsigned fdp :1; /* Fixed Data Partitions */ | ||
1266 | __u8 mfr; /* Medium Format Recognition */ | ||
1267 | __u8 reserved[2]; /* Reserved */ | ||
1268 | } idetape_medium_partition_page_t; | ||
1269 | |||
1270 | /* | ||
1271 | * Run time configurable parameters. | ||
1272 | */ | ||
1273 | typedef struct { | ||
1274 | int dsc_rw_frequency; | ||
1275 | int dsc_media_access_frequency; | ||
1276 | int nr_stages; | ||
1277 | } idetape_config_t; | ||
1278 | |||
1279 | /* | ||
1280 | * The variables below are used for the character device interface. | ||
1281 | * Additional state variables are defined in our ide_drive_t structure. | ||
1282 | */ | ||
1283 | static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES]; | ||
1284 | |||
1285 | #define ide_tape_f(file) ((file)->private_data) | ||
1286 | |||
1287 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | ||
1288 | { | ||
1289 | struct ide_tape_obj *tape = NULL; | ||
1290 | |||
1291 | down(&idetape_ref_sem); | ||
1292 | tape = idetape_devs[i]; | ||
1293 | if (tape) | ||
1294 | kref_get(&tape->kref); | ||
1295 | up(&idetape_ref_sem); | ||
1296 | return tape; | ||
1297 | } | ||
1298 | |||
1299 | /* | ||
1300 | * Function declarations | ||
1301 | * | ||
1302 | */ | ||
1303 | static int idetape_chrdev_release (struct inode *inode, struct file *filp); | ||
1304 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor); | ||
1305 | |||
1306 | /* | ||
1307 | * Too bad. The drive wants to send us data which we are not ready to accept. | ||
1308 | * Just throw it away. | ||
1309 | */ | ||
1310 | static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) | ||
1311 | { | ||
1312 | while (bcount--) | ||
1313 | (void) HWIF(drive)->INB(IDE_DATA_REG); | ||
1314 | } | ||
1315 | |||
1316 | static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) | ||
1317 | { | ||
1318 | struct idetape_bh *bh = pc->bh; | ||
1319 | int count; | ||
1320 | |||
1321 | while (bcount) { | ||
1322 | #if IDETAPE_DEBUG_BUGS | ||
1323 | if (bh == NULL) { | ||
1324 | printk(KERN_ERR "ide-tape: bh == NULL in " | ||
1325 | "idetape_input_buffers\n"); | ||
1326 | idetape_discard_data(drive, bcount); | ||
1327 | return; | ||
1328 | } | ||
1329 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
1330 | count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount); | ||
1331 | HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count); | ||
1332 | bcount -= count; | ||
1333 | atomic_add(count, &bh->b_count); | ||
1334 | if (atomic_read(&bh->b_count) == bh->b_size) { | ||
1335 | bh = bh->b_reqnext; | ||
1336 | if (bh) | ||
1337 | atomic_set(&bh->b_count, 0); | ||
1338 | } | ||
1339 | } | ||
1340 | pc->bh = bh; | ||
1341 | } | ||
1342 | |||
1343 | static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) | ||
1344 | { | ||
1345 | struct idetape_bh *bh = pc->bh; | ||
1346 | int count; | ||
1347 | |||
1348 | while (bcount) { | ||
1349 | #if IDETAPE_DEBUG_BUGS | ||
1350 | if (bh == NULL) { | ||
1351 | printk(KERN_ERR "ide-tape: bh == NULL in " | ||
1352 | "idetape_output_buffers\n"); | ||
1353 | return; | ||
1354 | } | ||
1355 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
1356 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); | ||
1357 | HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count); | ||
1358 | bcount -= count; | ||
1359 | pc->b_data += count; | ||
1360 | pc->b_count -= count; | ||
1361 | if (!pc->b_count) { | ||
1362 | pc->bh = bh = bh->b_reqnext; | ||
1363 | if (bh) { | ||
1364 | pc->b_data = bh->b_data; | ||
1365 | pc->b_count = atomic_read(&bh->b_count); | ||
1366 | } | ||
1367 | } | ||
1368 | } | ||
1369 | } | ||
1370 | |||
1371 | static void idetape_update_buffers (idetape_pc_t *pc) | ||
1372 | { | ||
1373 | struct idetape_bh *bh = pc->bh; | ||
1374 | int count; | ||
1375 | unsigned int bcount = pc->actually_transferred; | ||
1376 | |||
1377 | if (test_bit(PC_WRITING, &pc->flags)) | ||
1378 | return; | ||
1379 | while (bcount) { | ||
1380 | #if IDETAPE_DEBUG_BUGS | ||
1381 | if (bh == NULL) { | ||
1382 | printk(KERN_ERR "ide-tape: bh == NULL in " | ||
1383 | "idetape_update_buffers\n"); | ||
1384 | return; | ||
1385 | } | ||
1386 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
1387 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); | ||
1388 | atomic_set(&bh->b_count, count); | ||
1389 | if (atomic_read(&bh->b_count) == bh->b_size) | ||
1390 | bh = bh->b_reqnext; | ||
1391 | bcount -= count; | ||
1392 | } | ||
1393 | pc->bh = bh; | ||
1394 | } | ||
1395 | |||
1396 | /* | ||
1397 | * idetape_next_pc_storage returns a pointer to a place in which we can | ||
1398 | * safely store a packet command, even though we intend to leave the | ||
1399 | * driver. A storage space for a maximum of IDETAPE_PC_STACK packet | ||
1400 | * commands is allocated at initialization time. | ||
1401 | */ | ||
1402 | static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) | ||
1403 | { | ||
1404 | idetape_tape_t *tape = drive->driver_data; | ||
1405 | |||
1406 | #if IDETAPE_DEBUG_LOG | ||
1407 | if (tape->debug_level >= 5) | ||
1408 | printk(KERN_INFO "ide-tape: pc_stack_index=%d\n", | ||
1409 | tape->pc_stack_index); | ||
1410 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1411 | if (tape->pc_stack_index == IDETAPE_PC_STACK) | ||
1412 | tape->pc_stack_index=0; | ||
1413 | return (&tape->pc_stack[tape->pc_stack_index++]); | ||
1414 | } | ||
1415 | |||
1416 | /* | ||
1417 | * idetape_next_rq_storage is used along with idetape_next_pc_storage. | ||
1418 | * Since we queue packet commands in the request queue, we need to | ||
1419 | * allocate a request, along with the allocation of a packet command. | ||
1420 | */ | ||
1421 | |||
1422 | /************************************************************** | ||
1423 | * * | ||
1424 | * This should get fixed to use kmalloc(.., GFP_ATOMIC) * | ||
1425 | * followed later on by kfree(). -ml * | ||
1426 | * * | ||
1427 | **************************************************************/ | ||
1428 | |||
1429 | static struct request *idetape_next_rq_storage (ide_drive_t *drive) | ||
1430 | { | ||
1431 | idetape_tape_t *tape = drive->driver_data; | ||
1432 | |||
1433 | #if IDETAPE_DEBUG_LOG | ||
1434 | if (tape->debug_level >= 5) | ||
1435 | printk(KERN_INFO "ide-tape: rq_stack_index=%d\n", | ||
1436 | tape->rq_stack_index); | ||
1437 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1438 | if (tape->rq_stack_index == IDETAPE_PC_STACK) | ||
1439 | tape->rq_stack_index=0; | ||
1440 | return (&tape->rq_stack[tape->rq_stack_index++]); | ||
1441 | } | ||
1442 | |||
1443 | /* | ||
1444 | * idetape_init_pc initializes a packet command. | ||
1445 | */ | ||
1446 | static void idetape_init_pc (idetape_pc_t *pc) | ||
1447 | { | ||
1448 | memset(pc->c, 0, 12); | ||
1449 | pc->retries = 0; | ||
1450 | pc->flags = 0; | ||
1451 | pc->request_transfer = 0; | ||
1452 | pc->buffer = pc->pc_buffer; | ||
1453 | pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; | ||
1454 | pc->bh = NULL; | ||
1455 | pc->b_data = NULL; | ||
1456 | } | ||
1457 | |||
1458 | /* | ||
1459 | * idetape_analyze_error is called on each failed packet command retry | ||
1460 | * to analyze the request sense. We currently do not utilize this | ||
1461 | * information. | ||
1462 | */ | ||
1463 | static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) | ||
1464 | { | ||
1465 | idetape_tape_t *tape = drive->driver_data; | ||
1466 | idetape_pc_t *pc = tape->failed_pc; | ||
1467 | |||
1468 | tape->sense = *result; | ||
1469 | tape->sense_key = result->sense_key; | ||
1470 | tape->asc = result->asc; | ||
1471 | tape->ascq = result->ascq; | ||
1472 | #if IDETAPE_DEBUG_LOG | ||
1473 | /* | ||
1474 | * Without debugging, we only log an error if we decided to | ||
1475 | * give up retrying. | ||
1476 | */ | ||
1477 | if (tape->debug_level >= 1) | ||
1478 | printk(KERN_INFO "ide-tape: pc = %x, sense key = %x, " | ||
1479 | "asc = %x, ascq = %x\n", | ||
1480 | pc->c[0], result->sense_key, | ||
1481 | result->asc, result->ascq); | ||
1482 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1483 | |||
1484 | /* | ||
1485 | * Correct pc->actually_transferred by asking the tape. | ||
1486 | */ | ||
1487 | if (test_bit(PC_DMA_ERROR, &pc->flags)) { | ||
1488 | pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl(get_unaligned(&result->information)); | ||
1489 | idetape_update_buffers(pc); | ||
1490 | } | ||
1491 | |||
1492 | /* | ||
1493 | * If error was the result of a zero-length read or write command, | ||
1494 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | ||
1495 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | ||
1496 | */ | ||
1497 | if ((pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) | ||
1498 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { /* length==0 */ | ||
1499 | if (result->sense_key == 5) { | ||
1500 | /* don't report an error, everything's ok */ | ||
1501 | pc->error = 0; | ||
1502 | /* don't retry read/write */ | ||
1503 | set_bit(PC_ABORT, &pc->flags); | ||
1504 | } | ||
1505 | } | ||
1506 | if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { | ||
1507 | pc->error = IDETAPE_ERROR_FILEMARK; | ||
1508 | set_bit(PC_ABORT, &pc->flags); | ||
1509 | } | ||
1510 | if (pc->c[0] == IDETAPE_WRITE_CMD) { | ||
1511 | if (result->eom || | ||
1512 | (result->sense_key == 0xd && result->asc == 0x0 && | ||
1513 | result->ascq == 0x2)) { | ||
1514 | pc->error = IDETAPE_ERROR_EOD; | ||
1515 | set_bit(PC_ABORT, &pc->flags); | ||
1516 | } | ||
1517 | } | ||
1518 | if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { | ||
1519 | if (result->sense_key == 8) { | ||
1520 | pc->error = IDETAPE_ERROR_EOD; | ||
1521 | set_bit(PC_ABORT, &pc->flags); | ||
1522 | } | ||
1523 | if (!test_bit(PC_ABORT, &pc->flags) && | ||
1524 | pc->actually_transferred) | ||
1525 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; | ||
1526 | } | ||
1527 | } | ||
1528 | |||
1529 | /* | ||
1530 | * idetape_active_next_stage will declare the next stage as "active". | ||
1531 | */ | ||
1532 | static void idetape_active_next_stage (ide_drive_t *drive) | ||
1533 | { | ||
1534 | idetape_tape_t *tape = drive->driver_data; | ||
1535 | idetape_stage_t *stage = tape->next_stage; | ||
1536 | struct request *rq = &stage->rq; | ||
1537 | |||
1538 | #if IDETAPE_DEBUG_LOG | ||
1539 | if (tape->debug_level >= 4) | ||
1540 | printk(KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); | ||
1541 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1542 | #if IDETAPE_DEBUG_BUGS | ||
1543 | if (stage == NULL) { | ||
1544 | printk(KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); | ||
1545 | return; | ||
1546 | } | ||
1547 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
1548 | |||
1549 | rq->rq_disk = tape->disk; | ||
1550 | rq->buffer = NULL; | ||
1551 | rq->special = (void *)stage->bh; | ||
1552 | tape->active_data_request = rq; | ||
1553 | tape->active_stage = stage; | ||
1554 | tape->next_stage = stage->next; | ||
1555 | } | ||
1556 | |||
1557 | /* | ||
1558 | * idetape_increase_max_pipeline_stages is a part of the feedback | ||
1559 | * loop which tries to find the optimum number of stages. In the | ||
1560 | * feedback loop, we are starting from a minimum maximum number of | ||
1561 | * stages, and if we sense that the pipeline is empty, we try to | ||
1562 | * increase it, until we reach the user compile time memory limit. | ||
1563 | */ | ||
1564 | static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) | ||
1565 | { | ||
1566 | idetape_tape_t *tape = drive->driver_data; | ||
1567 | int increase = (tape->max_pipeline - tape->min_pipeline) / 10; | ||
1568 | |||
1569 | #if IDETAPE_DEBUG_LOG | ||
1570 | if (tape->debug_level >= 4) | ||
1571 | printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); | ||
1572 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1573 | |||
1574 | tape->max_stages += max(increase, 1); | ||
1575 | tape->max_stages = max(tape->max_stages, tape->min_pipeline); | ||
1576 | tape->max_stages = min(tape->max_stages, tape->max_pipeline); | ||
1577 | } | ||
1578 | |||
1579 | /* | ||
1580 | * idetape_kfree_stage calls kfree to completely free a stage, along with | ||
1581 | * its related buffers. | ||
1582 | */ | ||
1583 | static void __idetape_kfree_stage (idetape_stage_t *stage) | ||
1584 | { | ||
1585 | struct idetape_bh *prev_bh, *bh = stage->bh; | ||
1586 | int size; | ||
1587 | |||
1588 | while (bh != NULL) { | ||
1589 | if (bh->b_data != NULL) { | ||
1590 | size = (int) bh->b_size; | ||
1591 | while (size > 0) { | ||
1592 | free_page((unsigned long) bh->b_data); | ||
1593 | size -= PAGE_SIZE; | ||
1594 | bh->b_data += PAGE_SIZE; | ||
1595 | } | ||
1596 | } | ||
1597 | prev_bh = bh; | ||
1598 | bh = bh->b_reqnext; | ||
1599 | kfree(prev_bh); | ||
1600 | } | ||
1601 | kfree(stage); | ||
1602 | } | ||
1603 | |||
1604 | static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) | ||
1605 | { | ||
1606 | __idetape_kfree_stage(stage); | ||
1607 | } | ||
1608 | |||
1609 | /* | ||
1610 | * idetape_remove_stage_head removes tape->first_stage from the pipeline. | ||
1611 | * The caller should avoid race conditions. | ||
1612 | */ | ||
1613 | static void idetape_remove_stage_head (ide_drive_t *drive) | ||
1614 | { | ||
1615 | idetape_tape_t *tape = drive->driver_data; | ||
1616 | idetape_stage_t *stage; | ||
1617 | |||
1618 | #if IDETAPE_DEBUG_LOG | ||
1619 | if (tape->debug_level >= 4) | ||
1620 | printk(KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); | ||
1621 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1622 | #if IDETAPE_DEBUG_BUGS | ||
1623 | if (tape->first_stage == NULL) { | ||
1624 | printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); | ||
1625 | return; | ||
1626 | } | ||
1627 | if (tape->active_stage == tape->first_stage) { | ||
1628 | printk(KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); | ||
1629 | return; | ||
1630 | } | ||
1631 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
1632 | stage = tape->first_stage; | ||
1633 | tape->first_stage = stage->next; | ||
1634 | idetape_kfree_stage(tape, stage); | ||
1635 | tape->nr_stages--; | ||
1636 | if (tape->first_stage == NULL) { | ||
1637 | tape->last_stage = NULL; | ||
1638 | #if IDETAPE_DEBUG_BUGS | ||
1639 | if (tape->next_stage != NULL) | ||
1640 | printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); | ||
1641 | if (tape->nr_stages) | ||
1642 | printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); | ||
1643 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
1644 | } | ||
1645 | } | ||
1646 | |||
1647 | /* | ||
1648 | * This will free all the pipeline stages starting from new_last_stage->next | ||
1649 | * to the end of the list, and point tape->last_stage to new_last_stage. | ||
1650 | */ | ||
1651 | static void idetape_abort_pipeline(ide_drive_t *drive, | ||
1652 | idetape_stage_t *new_last_stage) | ||
1653 | { | ||
1654 | idetape_tape_t *tape = drive->driver_data; | ||
1655 | idetape_stage_t *stage = new_last_stage->next; | ||
1656 | idetape_stage_t *nstage; | ||
1657 | |||
1658 | #if IDETAPE_DEBUG_LOG | ||
1659 | if (tape->debug_level >= 4) | ||
1660 | printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); | ||
1661 | #endif | ||
1662 | while (stage) { | ||
1663 | nstage = stage->next; | ||
1664 | idetape_kfree_stage(tape, stage); | ||
1665 | --tape->nr_stages; | ||
1666 | --tape->nr_pending_stages; | ||
1667 | stage = nstage; | ||
1668 | } | ||
1669 | if (new_last_stage) | ||
1670 | new_last_stage->next = NULL; | ||
1671 | tape->last_stage = new_last_stage; | ||
1672 | tape->next_stage = NULL; | ||
1673 | } | ||
1674 | |||
1675 | /* | ||
1676 | * idetape_end_request is used to finish servicing a request, and to | ||
1677 | * insert a pending pipeline request into the main device queue. | ||
1678 | */ | ||
1679 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) | ||
1680 | { | ||
1681 | struct request *rq = HWGROUP(drive)->rq; | ||
1682 | idetape_tape_t *tape = drive->driver_data; | ||
1683 | unsigned long flags; | ||
1684 | int error; | ||
1685 | int remove_stage = 0; | ||
1686 | idetape_stage_t *active_stage; | ||
1687 | |||
1688 | #if IDETAPE_DEBUG_LOG | ||
1689 | if (tape->debug_level >= 4) | ||
1690 | printk(KERN_INFO "ide-tape: Reached idetape_end_request\n"); | ||
1691 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1692 | |||
1693 | switch (uptodate) { | ||
1694 | case 0: error = IDETAPE_ERROR_GENERAL; break; | ||
1695 | case 1: error = 0; break; | ||
1696 | default: error = uptodate; | ||
1697 | } | ||
1698 | rq->errors = error; | ||
1699 | if (error) | ||
1700 | tape->failed_pc = NULL; | ||
1701 | |||
1702 | spin_lock_irqsave(&tape->spinlock, flags); | ||
1703 | |||
1704 | /* The request was a pipelined data transfer request */ | ||
1705 | if (tape->active_data_request == rq) { | ||
1706 | active_stage = tape->active_stage; | ||
1707 | tape->active_stage = NULL; | ||
1708 | tape->active_data_request = NULL; | ||
1709 | tape->nr_pending_stages--; | ||
1710 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { | ||
1711 | remove_stage = 1; | ||
1712 | if (error) { | ||
1713 | set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | ||
1714 | if (error == IDETAPE_ERROR_EOD) | ||
1715 | idetape_abort_pipeline(drive, active_stage); | ||
1716 | } | ||
1717 | } else if (rq->cmd[0] & REQ_IDETAPE_READ) { | ||
1718 | if (error == IDETAPE_ERROR_EOD) { | ||
1719 | set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | ||
1720 | idetape_abort_pipeline(drive, active_stage); | ||
1721 | } | ||
1722 | } | ||
1723 | if (tape->next_stage != NULL) { | ||
1724 | idetape_active_next_stage(drive); | ||
1725 | |||
1726 | /* | ||
1727 | * Insert the next request into the request queue. | ||
1728 | */ | ||
1729 | (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); | ||
1730 | } else if (!error) { | ||
1731 | idetape_increase_max_pipeline_stages(drive); | ||
1732 | } | ||
1733 | } | ||
1734 | ide_end_drive_cmd(drive, 0, 0); | ||
1735 | // blkdev_dequeue_request(rq); | ||
1736 | // drive->rq = NULL; | ||
1737 | // end_that_request_last(rq); | ||
1738 | |||
1739 | if (remove_stage) | ||
1740 | idetape_remove_stage_head(drive); | ||
1741 | if (tape->active_data_request == NULL) | ||
1742 | clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); | ||
1743 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
1744 | return 0; | ||
1745 | } | ||
1746 | |||
1747 | static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) | ||
1748 | { | ||
1749 | idetape_tape_t *tape = drive->driver_data; | ||
1750 | |||
1751 | #if IDETAPE_DEBUG_LOG | ||
1752 | if (tape->debug_level >= 4) | ||
1753 | printk(KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); | ||
1754 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1755 | if (!tape->pc->error) { | ||
1756 | idetape_analyze_error(drive, (idetape_request_sense_result_t *) tape->pc->buffer); | ||
1757 | idetape_end_request(drive, 1, 0); | ||
1758 | } else { | ||
1759 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); | ||
1760 | idetape_end_request(drive, 0, 0); | ||
1761 | } | ||
1762 | return ide_stopped; | ||
1763 | } | ||
1764 | |||
1765 | static void idetape_create_request_sense_cmd (idetape_pc_t *pc) | ||
1766 | { | ||
1767 | idetape_init_pc(pc); | ||
1768 | pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; | ||
1769 | pc->c[4] = 20; | ||
1770 | pc->request_transfer = 20; | ||
1771 | pc->callback = &idetape_request_sense_callback; | ||
1772 | } | ||
1773 | |||
1774 | static void idetape_init_rq(struct request *rq, u8 cmd) | ||
1775 | { | ||
1776 | memset(rq, 0, sizeof(*rq)); | ||
1777 | rq->flags = REQ_SPECIAL; | ||
1778 | rq->cmd[0] = cmd; | ||
1779 | } | ||
1780 | |||
1781 | /* | ||
1782 | * idetape_queue_pc_head generates a new packet command request in front | ||
1783 | * of the request queue, before the current request, so that it will be | ||
1784 | * processed immediately, on the next pass through the driver. | ||
1785 | * | ||
1786 | * idetape_queue_pc_head is called from the request handling part of | ||
1787 | * the driver (the "bottom" part). Safe storage for the request should | ||
1788 | * be allocated with idetape_next_pc_storage and idetape_next_rq_storage | ||
1789 | * before calling idetape_queue_pc_head. | ||
1790 | * | ||
1791 | * Memory for those requests is pre-allocated at initialization time, and | ||
1792 | * is limited to IDETAPE_PC_STACK requests. We assume that we have enough | ||
1793 | * space for the maximum possible number of inter-dependent packet commands. | ||
1794 | * | ||
1795 | * The higher level of the driver - The ioctl handler and the character | ||
1796 | * device handling functions should queue request to the lower level part | ||
1797 | * and wait for their completion using idetape_queue_pc_tail or | ||
1798 | * idetape_queue_rw_tail. | ||
1799 | */ | ||
1800 | static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq) | ||
1801 | { | ||
1802 | struct ide_tape_obj *tape = drive->driver_data; | ||
1803 | |||
1804 | idetape_init_rq(rq, REQ_IDETAPE_PC1); | ||
1805 | rq->buffer = (char *) pc; | ||
1806 | rq->rq_disk = tape->disk; | ||
1807 | (void) ide_do_drive_cmd(drive, rq, ide_preempt); | ||
1808 | } | ||
1809 | |||
1810 | /* | ||
1811 | * idetape_retry_pc is called when an error was detected during the | ||
1812 | * last packet command. We queue a request sense packet command in | ||
1813 | * the head of the request list. | ||
1814 | */ | ||
1815 | static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) | ||
1816 | { | ||
1817 | idetape_tape_t *tape = drive->driver_data; | ||
1818 | idetape_pc_t *pc; | ||
1819 | struct request *rq; | ||
1820 | atapi_error_t error; | ||
1821 | |||
1822 | error.all = HWIF(drive)->INB(IDE_ERROR_REG); | ||
1823 | pc = idetape_next_pc_storage(drive); | ||
1824 | rq = idetape_next_rq_storage(drive); | ||
1825 | idetape_create_request_sense_cmd(pc); | ||
1826 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); | ||
1827 | idetape_queue_pc_head(drive, pc, rq); | ||
1828 | return ide_stopped; | ||
1829 | } | ||
1830 | |||
1831 | /* | ||
1832 | * idetape_postpone_request postpones the current request so that | ||
1833 | * ide.c will be able to service requests from another device on | ||
1834 | * the same hwgroup while we are polling for DSC. | ||
1835 | */ | ||
1836 | static void idetape_postpone_request (ide_drive_t *drive) | ||
1837 | { | ||
1838 | idetape_tape_t *tape = drive->driver_data; | ||
1839 | |||
1840 | #if IDETAPE_DEBUG_LOG | ||
1841 | if (tape->debug_level >= 4) | ||
1842 | printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); | ||
1843 | #endif | ||
1844 | tape->postponed_rq = HWGROUP(drive)->rq; | ||
1845 | ide_stall_queue(drive, tape->dsc_polling_frequency); | ||
1846 | } | ||
1847 | |||
1848 | /* | ||
1849 | * idetape_pc_intr is the usual interrupt handler which will be called | ||
1850 | * during a packet command. We will transfer some of the data (as | ||
1851 | * requested by the drive) and will re-point interrupt handler to us. | ||
1852 | * When data transfer is finished, we will act according to the | ||
1853 | * algorithm described before idetape_issue_packet_command. | ||
1854 | * | ||
1855 | */ | ||
1856 | static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) | ||
1857 | { | ||
1858 | ide_hwif_t *hwif = drive->hwif; | ||
1859 | idetape_tape_t *tape = drive->driver_data; | ||
1860 | atapi_status_t status; | ||
1861 | atapi_bcount_t bcount; | ||
1862 | atapi_ireason_t ireason; | ||
1863 | idetape_pc_t *pc = tape->pc; | ||
1864 | |||
1865 | unsigned int temp; | ||
1866 | #if SIMULATE_ERRORS | ||
1867 | static int error_sim_count = 0; | ||
1868 | #endif | ||
1869 | |||
1870 | #if IDETAPE_DEBUG_LOG | ||
1871 | if (tape->debug_level >= 4) | ||
1872 | printk(KERN_INFO "ide-tape: Reached idetape_pc_intr " | ||
1873 | "interrupt handler\n"); | ||
1874 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1875 | |||
1876 | /* Clear the interrupt */ | ||
1877 | status.all = HWIF(drive)->INB(IDE_STATUS_REG); | ||
1878 | |||
1879 | if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { | ||
1880 | if (HWIF(drive)->ide_dma_end(drive) || status.b.check) { | ||
1881 | /* | ||
1882 | * A DMA error is sometimes expected. For example, | ||
1883 | * if the tape is crossing a filemark during a | ||
1884 | * READ command, it will issue an irq and position | ||
1885 | * itself before the filemark, so that only a partial | ||
1886 | * data transfer will occur (which causes the DMA | ||
1887 | * error). In that case, we will later ask the tape | ||
1888 | * how much bytes of the original request were | ||
1889 | * actually transferred (we can't receive that | ||
1890 | * information from the DMA engine on most chipsets). | ||
1891 | */ | ||
1892 | |||
1893 | /* | ||
1894 | * On the contrary, a DMA error is never expected; | ||
1895 | * it usually indicates a hardware error or abort. | ||
1896 | * If the tape crosses a filemark during a READ | ||
1897 | * command, it will issue an irq and position itself | ||
1898 | * after the filemark (not before). Only a partial | ||
1899 | * data transfer will occur, but no DMA error. | ||
1900 | * (AS, 19 Apr 2001) | ||
1901 | */ | ||
1902 | set_bit(PC_DMA_ERROR, &pc->flags); | ||
1903 | } else { | ||
1904 | pc->actually_transferred = pc->request_transfer; | ||
1905 | idetape_update_buffers(pc); | ||
1906 | } | ||
1907 | #if IDETAPE_DEBUG_LOG | ||
1908 | if (tape->debug_level >= 4) | ||
1909 | printk(KERN_INFO "ide-tape: DMA finished\n"); | ||
1910 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1911 | } | ||
1912 | |||
1913 | /* No more interrupts */ | ||
1914 | if (!status.b.drq) { | ||
1915 | #if IDETAPE_DEBUG_LOG | ||
1916 | if (tape->debug_level >= 2) | ||
1917 | printk(KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); | ||
1918 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1919 | clear_bit(PC_DMA_IN_PROGRESS, &pc->flags); | ||
1920 | |||
1921 | local_irq_enable(); | ||
1922 | |||
1923 | #if SIMULATE_ERRORS | ||
1924 | if ((pc->c[0] == IDETAPE_WRITE_CMD || | ||
1925 | pc->c[0] == IDETAPE_READ_CMD) && | ||
1926 | (++error_sim_count % 100) == 0) { | ||
1927 | printk(KERN_INFO "ide-tape: %s: simulating error\n", | ||
1928 | tape->name); | ||
1929 | status.b.check = 1; | ||
1930 | } | ||
1931 | #endif | ||
1932 | if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) | ||
1933 | status.b.check = 0; | ||
1934 | if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) { /* Error detected */ | ||
1935 | #if IDETAPE_DEBUG_LOG | ||
1936 | if (tape->debug_level >= 1) | ||
1937 | printk(KERN_INFO "ide-tape: %s: I/O error\n", | ||
1938 | tape->name); | ||
1939 | #endif /* IDETAPE_DEBUG_LOG */ | ||
1940 | if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { | ||
1941 | printk(KERN_ERR "ide-tape: I/O error in request sense command\n"); | ||
1942 | return ide_do_reset(drive); | ||
1943 | } | ||
1944 | #if IDETAPE_DEBUG_LOG | ||
1945 | if (tape->debug_level >= 1) | ||
1946 | printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); | ||
1947 | #endif | ||
1948 | /* Retry operation */ | ||
1949 | return idetape_retry_pc(drive); | ||
1950 | } | ||
1951 | pc->error = 0; | ||
1952 | if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) && | ||
1953 | !status.b.dsc) { | ||
1954 | /* Media access command */ | ||
1955 | tape->dsc_polling_start = jiffies; | ||
1956 | tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; | ||
1957 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | ||
1958 | /* Allow ide.c to handle other requests */ | ||
1959 | idetape_postpone_request(drive); | ||
1960 | return ide_stopped; | ||
1961 | } | ||
1962 | if (tape->failed_pc == pc) | ||
1963 | tape->failed_pc = NULL; | ||
1964 | /* Command finished - Call the callback function */ | ||
1965 | return pc->callback(drive); | ||
1966 | } | ||
1967 | if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) { | ||
1968 | printk(KERN_ERR "ide-tape: The tape wants to issue more " | ||
1969 | "interrupts in DMA mode\n"); | ||
1970 | printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); | ||
1971 | (void)__ide_dma_off(drive); | ||
1972 | return ide_do_reset(drive); | ||
1973 | } | ||
1974 | /* Get the number of bytes to transfer on this interrupt. */ | ||
1975 | bcount.b.high = hwif->INB(IDE_BCOUNTH_REG); | ||
1976 | bcount.b.low = hwif->INB(IDE_BCOUNTL_REG); | ||
1977 | |||
1978 | ireason.all = hwif->INB(IDE_IREASON_REG); | ||
1979 | |||
1980 | if (ireason.b.cod) { | ||
1981 | printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); | ||
1982 | return ide_do_reset(drive); | ||
1983 | } | ||
1984 | if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) { | ||
1985 | /* Hopefully, we will never get here */ | ||
1986 | printk(KERN_ERR "ide-tape: We wanted to %s, ", | ||
1987 | ireason.b.io ? "Write":"Read"); | ||
1988 | printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n", | ||
1989 | ireason.b.io ? "Read":"Write"); | ||
1990 | return ide_do_reset(drive); | ||
1991 | } | ||
1992 | if (!test_bit(PC_WRITING, &pc->flags)) { | ||
1993 | /* Reading - Check that we have enough space */ | ||
1994 | temp = pc->actually_transferred + bcount.all; | ||
1995 | if (temp > pc->request_transfer) { | ||
1996 | if (temp > pc->buffer_size) { | ||
1997 | printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); | ||
1998 | idetape_discard_data(drive, bcount.all); | ||
1999 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | ||
2000 | return ide_started; | ||
2001 | } | ||
2002 | #if IDETAPE_DEBUG_LOG | ||
2003 | if (tape->debug_level >= 2) | ||
2004 | printk(KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); | ||
2005 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2006 | } | ||
2007 | } | ||
2008 | if (test_bit(PC_WRITING, &pc->flags)) { | ||
2009 | if (pc->bh != NULL) | ||
2010 | idetape_output_buffers(drive, pc, bcount.all); | ||
2011 | else | ||
2012 | /* Write the current buffer */ | ||
2013 | HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all); | ||
2014 | } else { | ||
2015 | if (pc->bh != NULL) | ||
2016 | idetape_input_buffers(drive, pc, bcount.all); | ||
2017 | else | ||
2018 | /* Read the current buffer */ | ||
2019 | HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all); | ||
2020 | } | ||
2021 | /* Update the current position */ | ||
2022 | pc->actually_transferred += bcount.all; | ||
2023 | pc->current_position += bcount.all; | ||
2024 | #if IDETAPE_DEBUG_LOG | ||
2025 | if (tape->debug_level >= 2) | ||
2026 | printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all); | ||
2027 | #endif | ||
2028 | /* And set the interrupt handler again */ | ||
2029 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | ||
2030 | return ide_started; | ||
2031 | } | ||
2032 | |||
2033 | /* | ||
2034 | * Packet Command Interface | ||
2035 | * | ||
2036 | * The current Packet Command is available in tape->pc, and will not | ||
2037 | * change until we finish handling it. Each packet command is associated | ||
2038 | * with a callback function that will be called when the command is | ||
2039 | * finished. | ||
2040 | * | ||
2041 | * The handling will be done in three stages: | ||
2042 | * | ||
2043 | * 1. idetape_issue_packet_command will send the packet command to the | ||
2044 | * drive, and will set the interrupt handler to idetape_pc_intr. | ||
2045 | * | ||
2046 | * 2. On each interrupt, idetape_pc_intr will be called. This step | ||
2047 | * will be repeated until the device signals us that no more | ||
2048 | * interrupts will be issued. | ||
2049 | * | ||
2050 | * 3. ATAPI Tape media access commands have immediate status with a | ||
2051 | * delayed process. In case of a successful initiation of a | ||
2052 | * media access packet command, the DSC bit will be set when the | ||
2053 | * actual execution of the command is finished. | ||
2054 | * Since the tape drive will not issue an interrupt, we have to | ||
2055 | * poll for this event. In this case, we define the request as | ||
2056 | * "low priority request" by setting rq_status to | ||
2057 | * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit | ||
2058 | * the driver. | ||
2059 | * | ||
2060 | * ide.c will then give higher priority to requests which | ||
2061 | * originate from the other device, until will change rq_status | ||
2062 | * to RQ_ACTIVE. | ||
2063 | * | ||
2064 | * 4. When the packet command is finished, it will be checked for errors. | ||
2065 | * | ||
2066 | * 5. In case an error was found, we queue a request sense packet | ||
2067 | * command in front of the request queue and retry the operation | ||
2068 | * up to IDETAPE_MAX_PC_RETRIES times. | ||
2069 | * | ||
2070 | * 6. In case no error was found, or we decided to give up and not | ||
2071 | * to retry again, the callback function will be called and then | ||
2072 | * we will handle the next request. | ||
2073 | * | ||
2074 | */ | ||
2075 | static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) | ||
2076 | { | ||
2077 | ide_hwif_t *hwif = drive->hwif; | ||
2078 | idetape_tape_t *tape = drive->driver_data; | ||
2079 | idetape_pc_t *pc = tape->pc; | ||
2080 | atapi_ireason_t ireason; | ||
2081 | int retries = 100; | ||
2082 | ide_startstop_t startstop; | ||
2083 | |||
2084 | if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { | ||
2085 | printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); | ||
2086 | return startstop; | ||
2087 | } | ||
2088 | ireason.all = hwif->INB(IDE_IREASON_REG); | ||
2089 | while (retries-- && (!ireason.b.cod || ireason.b.io)) { | ||
2090 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing " | ||
2091 | "a packet command, retrying\n"); | ||
2092 | udelay(100); | ||
2093 | ireason.all = hwif->INB(IDE_IREASON_REG); | ||
2094 | if (retries == 0) { | ||
2095 | printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while " | ||
2096 | "issuing a packet command, ignoring\n"); | ||
2097 | ireason.b.cod = 1; | ||
2098 | ireason.b.io = 0; | ||
2099 | } | ||
2100 | } | ||
2101 | if (!ireason.b.cod || ireason.b.io) { | ||
2102 | printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing " | ||
2103 | "a packet command\n"); | ||
2104 | return ide_do_reset(drive); | ||
2105 | } | ||
2106 | /* Set the interrupt routine */ | ||
2107 | ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); | ||
2108 | #ifdef CONFIG_BLK_DEV_IDEDMA | ||
2109 | /* Begin DMA, if necessary */ | ||
2110 | if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) | ||
2111 | hwif->dma_start(drive); | ||
2112 | #endif | ||
2113 | /* Send the actual packet */ | ||
2114 | HWIF(drive)->atapi_output_bytes(drive, pc->c, 12); | ||
2115 | return ide_started; | ||
2116 | } | ||
2117 | |||
2118 | static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) | ||
2119 | { | ||
2120 | ide_hwif_t *hwif = drive->hwif; | ||
2121 | idetape_tape_t *tape = drive->driver_data; | ||
2122 | atapi_bcount_t bcount; | ||
2123 | int dma_ok = 0; | ||
2124 | |||
2125 | #if IDETAPE_DEBUG_BUGS | ||
2126 | if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && | ||
2127 | pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { | ||
2128 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " | ||
2129 | "Two request sense in serial were issued\n"); | ||
2130 | } | ||
2131 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
2132 | |||
2133 | if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) | ||
2134 | tape->failed_pc = pc; | ||
2135 | /* Set the current packet command */ | ||
2136 | tape->pc = pc; | ||
2137 | |||
2138 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | ||
2139 | test_bit(PC_ABORT, &pc->flags)) { | ||
2140 | /* | ||
2141 | * We will "abort" retrying a packet command in case | ||
2142 | * a legitimate error code was received (crossing a | ||
2143 | * filemark, or end of the media, for example). | ||
2144 | */ | ||
2145 | if (!test_bit(PC_ABORT, &pc->flags)) { | ||
2146 | if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && | ||
2147 | tape->sense_key == 2 && tape->asc == 4 && | ||
2148 | (tape->ascq == 1 || tape->ascq == 8))) { | ||
2149 | printk(KERN_ERR "ide-tape: %s: I/O error, " | ||
2150 | "pc = %2x, key = %2x, " | ||
2151 | "asc = %2x, ascq = %2x\n", | ||
2152 | tape->name, pc->c[0], | ||
2153 | tape->sense_key, tape->asc, | ||
2154 | tape->ascq); | ||
2155 | } | ||
2156 | /* Giving up */ | ||
2157 | pc->error = IDETAPE_ERROR_GENERAL; | ||
2158 | } | ||
2159 | tape->failed_pc = NULL; | ||
2160 | return pc->callback(drive); | ||
2161 | } | ||
2162 | #if IDETAPE_DEBUG_LOG | ||
2163 | if (tape->debug_level >= 2) | ||
2164 | printk(KERN_INFO "ide-tape: Retry number - %d, cmd = %02X\n", pc->retries, pc->c[0]); | ||
2165 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2166 | |||
2167 | pc->retries++; | ||
2168 | /* We haven't transferred any data yet */ | ||
2169 | pc->actually_transferred = 0; | ||
2170 | pc->current_position = pc->buffer; | ||
2171 | /* Request to transfer the entire buffer at once */ | ||
2172 | bcount.all = pc->request_transfer; | ||
2173 | |||
2174 | if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) { | ||
2175 | printk(KERN_WARNING "ide-tape: DMA disabled, " | ||
2176 | "reverting to PIO\n"); | ||
2177 | (void)__ide_dma_off(drive); | ||
2178 | } | ||
2179 | if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) | ||
2180 | dma_ok = !hwif->dma_setup(drive); | ||
2181 | |||
2182 | if (IDE_CONTROL_REG) | ||
2183 | hwif->OUTB(drive->ctl, IDE_CONTROL_REG); | ||
2184 | hwif->OUTB(dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */ | ||
2185 | hwif->OUTB(bcount.b.high, IDE_BCOUNTH_REG); | ||
2186 | hwif->OUTB(bcount.b.low, IDE_BCOUNTL_REG); | ||
2187 | hwif->OUTB(drive->select.all, IDE_SELECT_REG); | ||
2188 | if (dma_ok) /* Will begin DMA later */ | ||
2189 | set_bit(PC_DMA_IN_PROGRESS, &pc->flags); | ||
2190 | if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { | ||
2191 | ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); | ||
2192 | hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); | ||
2193 | return ide_started; | ||
2194 | } else { | ||
2195 | hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG); | ||
2196 | return idetape_transfer_pc(drive); | ||
2197 | } | ||
2198 | } | ||
2199 | |||
2200 | /* | ||
2201 | * General packet command callback function. | ||
2202 | */ | ||
2203 | static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) | ||
2204 | { | ||
2205 | idetape_tape_t *tape = drive->driver_data; | ||
2206 | |||
2207 | #if IDETAPE_DEBUG_LOG | ||
2208 | if (tape->debug_level >= 4) | ||
2209 | printk(KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); | ||
2210 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2211 | |||
2212 | idetape_end_request(drive, tape->pc->error ? 0 : 1, 0); | ||
2213 | return ide_stopped; | ||
2214 | } | ||
2215 | |||
2216 | /* | ||
2217 | * A mode sense command is used to "sense" tape parameters. | ||
2218 | */ | ||
2219 | static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code) | ||
2220 | { | ||
2221 | idetape_init_pc(pc); | ||
2222 | pc->c[0] = IDETAPE_MODE_SENSE_CMD; | ||
2223 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) | ||
2224 | pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ | ||
2225 | pc->c[2] = page_code; | ||
2226 | /* | ||
2227 | * Changed pc->c[3] to 0 (255 will at best return unused info). | ||
2228 | * | ||
2229 | * For SCSI this byte is defined as subpage instead of high byte | ||
2230 | * of length and some IDE drives seem to interpret it this way | ||
2231 | * and return an error when 255 is used. | ||
2232 | */ | ||
2233 | pc->c[3] = 0; | ||
2234 | pc->c[4] = 255; /* (We will just discard data in that case) */ | ||
2235 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) | ||
2236 | pc->request_transfer = 12; | ||
2237 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) | ||
2238 | pc->request_transfer = 24; | ||
2239 | else | ||
2240 | pc->request_transfer = 50; | ||
2241 | pc->callback = &idetape_pc_callback; | ||
2242 | } | ||
2243 | |||
2244 | static void calculate_speeds(ide_drive_t *drive) | ||
2245 | { | ||
2246 | idetape_tape_t *tape = drive->driver_data; | ||
2247 | int full = 125, empty = 75; | ||
2248 | |||
2249 | if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) { | ||
2250 | tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; | ||
2251 | tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; | ||
2252 | tape->controlled_last_pipeline_head = tape->pipeline_head; | ||
2253 | tape->controlled_pipeline_head_time = jiffies; | ||
2254 | } | ||
2255 | if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ)) | ||
2256 | tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); | ||
2257 | else if (time_after(jiffies, tape->controlled_previous_head_time)) | ||
2258 | tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); | ||
2259 | |||
2260 | if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { | ||
2261 | /* -1 for read mode error recovery */ | ||
2262 | if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) { | ||
2263 | tape->uncontrolled_pipeline_head_time = jiffies; | ||
2264 | tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); | ||
2265 | } | ||
2266 | } else { | ||
2267 | tape->uncontrolled_previous_head_time = jiffies; | ||
2268 | tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; | ||
2269 | if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) { | ||
2270 | tape->uncontrolled_pipeline_head_time = jiffies; | ||
2271 | } | ||
2272 | } | ||
2273 | tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); | ||
2274 | if (tape->speed_control == 0) { | ||
2275 | tape->max_insert_speed = 5000; | ||
2276 | } else if (tape->speed_control == 1) { | ||
2277 | if (tape->nr_pending_stages >= tape->max_stages / 2) | ||
2278 | tape->max_insert_speed = tape->pipeline_head_speed + | ||
2279 | (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; | ||
2280 | else | ||
2281 | tape->max_insert_speed = 500 + | ||
2282 | (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; | ||
2283 | if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) | ||
2284 | tape->max_insert_speed = 5000; | ||
2285 | } else if (tape->speed_control == 2) { | ||
2286 | tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + | ||
2287 | (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; | ||
2288 | } else | ||
2289 | tape->max_insert_speed = tape->speed_control; | ||
2290 | tape->max_insert_speed = max(tape->max_insert_speed, 500); | ||
2291 | } | ||
2292 | |||
2293 | static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) | ||
2294 | { | ||
2295 | idetape_tape_t *tape = drive->driver_data; | ||
2296 | idetape_pc_t *pc = tape->pc; | ||
2297 | atapi_status_t status; | ||
2298 | |||
2299 | status.all = HWIF(drive)->INB(IDE_STATUS_REG); | ||
2300 | if (status.b.dsc) { | ||
2301 | if (status.b.check) { | ||
2302 | /* Error detected */ | ||
2303 | if (pc->c[0] != IDETAPE_TEST_UNIT_READY_CMD) | ||
2304 | printk(KERN_ERR "ide-tape: %s: I/O error, ", | ||
2305 | tape->name); | ||
2306 | /* Retry operation */ | ||
2307 | return idetape_retry_pc(drive); | ||
2308 | } | ||
2309 | pc->error = 0; | ||
2310 | if (tape->failed_pc == pc) | ||
2311 | tape->failed_pc = NULL; | ||
2312 | } else { | ||
2313 | pc->error = IDETAPE_ERROR_GENERAL; | ||
2314 | tape->failed_pc = NULL; | ||
2315 | } | ||
2316 | return pc->callback(drive); | ||
2317 | } | ||
2318 | |||
2319 | static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) | ||
2320 | { | ||
2321 | idetape_tape_t *tape = drive->driver_data; | ||
2322 | struct request *rq = HWGROUP(drive)->rq; | ||
2323 | int blocks = tape->pc->actually_transferred / tape->tape_block_size; | ||
2324 | |||
2325 | tape->avg_size += blocks * tape->tape_block_size; | ||
2326 | tape->insert_size += blocks * tape->tape_block_size; | ||
2327 | if (tape->insert_size > 1024 * 1024) | ||
2328 | tape->measure_insert_time = 1; | ||
2329 | if (tape->measure_insert_time) { | ||
2330 | tape->measure_insert_time = 0; | ||
2331 | tape->insert_time = jiffies; | ||
2332 | tape->insert_size = 0; | ||
2333 | } | ||
2334 | if (time_after(jiffies, tape->insert_time)) | ||
2335 | tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); | ||
2336 | if (jiffies - tape->avg_time >= HZ) { | ||
2337 | tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; | ||
2338 | tape->avg_size = 0; | ||
2339 | tape->avg_time = jiffies; | ||
2340 | } | ||
2341 | |||
2342 | #if IDETAPE_DEBUG_LOG | ||
2343 | if (tape->debug_level >= 4) | ||
2344 | printk(KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); | ||
2345 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2346 | |||
2347 | tape->first_frame_position += blocks; | ||
2348 | rq->current_nr_sectors -= blocks; | ||
2349 | |||
2350 | if (!tape->pc->error) | ||
2351 | idetape_end_request(drive, 1, 0); | ||
2352 | else | ||
2353 | idetape_end_request(drive, tape->pc->error, 0); | ||
2354 | return ide_stopped; | ||
2355 | } | ||
2356 | |||
2357 | static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) | ||
2358 | { | ||
2359 | idetape_init_pc(pc); | ||
2360 | pc->c[0] = IDETAPE_READ_CMD; | ||
2361 | put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); | ||
2362 | pc->c[1] = 1; | ||
2363 | pc->callback = &idetape_rw_callback; | ||
2364 | pc->bh = bh; | ||
2365 | atomic_set(&bh->b_count, 0); | ||
2366 | pc->buffer = NULL; | ||
2367 | pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; | ||
2368 | if (pc->request_transfer == tape->stage_size) | ||
2369 | set_bit(PC_DMA_RECOMMENDED, &pc->flags); | ||
2370 | } | ||
2371 | |||
2372 | static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) | ||
2373 | { | ||
2374 | int size = 32768; | ||
2375 | struct idetape_bh *p = bh; | ||
2376 | |||
2377 | idetape_init_pc(pc); | ||
2378 | pc->c[0] = IDETAPE_READ_BUFFER_CMD; | ||
2379 | pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; | ||
2380 | pc->c[7] = size >> 8; | ||
2381 | pc->c[8] = size & 0xff; | ||
2382 | pc->callback = &idetape_pc_callback; | ||
2383 | pc->bh = bh; | ||
2384 | atomic_set(&bh->b_count, 0); | ||
2385 | pc->buffer = NULL; | ||
2386 | while (p) { | ||
2387 | atomic_set(&p->b_count, 0); | ||
2388 | p = p->b_reqnext; | ||
2389 | } | ||
2390 | pc->request_transfer = pc->buffer_size = size; | ||
2391 | } | ||
2392 | |||
2393 | static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh) | ||
2394 | { | ||
2395 | idetape_init_pc(pc); | ||
2396 | pc->c[0] = IDETAPE_WRITE_CMD; | ||
2397 | put_unaligned(htonl(length), (unsigned int *) &pc->c[1]); | ||
2398 | pc->c[1] = 1; | ||
2399 | pc->callback = &idetape_rw_callback; | ||
2400 | set_bit(PC_WRITING, &pc->flags); | ||
2401 | pc->bh = bh; | ||
2402 | pc->b_data = bh->b_data; | ||
2403 | pc->b_count = atomic_read(&bh->b_count); | ||
2404 | pc->buffer = NULL; | ||
2405 | pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; | ||
2406 | if (pc->request_transfer == tape->stage_size) | ||
2407 | set_bit(PC_DMA_RECOMMENDED, &pc->flags); | ||
2408 | } | ||
2409 | |||
2410 | /* | ||
2411 | * idetape_do_request is our request handling function. | ||
2412 | */ | ||
2413 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, | ||
2414 | struct request *rq, sector_t block) | ||
2415 | { | ||
2416 | idetape_tape_t *tape = drive->driver_data; | ||
2417 | idetape_pc_t *pc = NULL; | ||
2418 | struct request *postponed_rq = tape->postponed_rq; | ||
2419 | atapi_status_t status; | ||
2420 | |||
2421 | #if IDETAPE_DEBUG_LOG | ||
2422 | #if 0 | ||
2423 | if (tape->debug_level >= 5) | ||
2424 | printk(KERN_INFO "ide-tape: rq_status: %d, " | ||
2425 | "dev: %s, cmd: %ld, errors: %d\n", rq->rq_status, | ||
2426 | rq->rq_disk->disk_name, rq->cmd[0], rq->errors); | ||
2427 | #endif | ||
2428 | if (tape->debug_level >= 2) | ||
2429 | printk(KERN_INFO "ide-tape: sector: %ld, " | ||
2430 | "nr_sectors: %ld, current_nr_sectors: %d\n", | ||
2431 | rq->sector, rq->nr_sectors, rq->current_nr_sectors); | ||
2432 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2433 | |||
2434 | if ((rq->flags & REQ_SPECIAL) == 0) { | ||
2435 | /* | ||
2436 | * We do not support buffer cache originated requests. | ||
2437 | */ | ||
2438 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " | ||
2439 | "request queue (%ld)\n", drive->name, rq->flags); | ||
2440 | ide_end_request(drive, 0, 0); | ||
2441 | return ide_stopped; | ||
2442 | } | ||
2443 | |||
2444 | /* | ||
2445 | * Retry a failed packet command | ||
2446 | */ | ||
2447 | if (tape->failed_pc != NULL && | ||
2448 | tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { | ||
2449 | return idetape_issue_packet_command(drive, tape->failed_pc); | ||
2450 | } | ||
2451 | #if IDETAPE_DEBUG_BUGS | ||
2452 | if (postponed_rq != NULL) | ||
2453 | if (rq != postponed_rq) { | ||
2454 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | ||
2455 | "Two DSC requests were queued\n"); | ||
2456 | idetape_end_request(drive, 0, 0); | ||
2457 | return ide_stopped; | ||
2458 | } | ||
2459 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
2460 | |||
2461 | tape->postponed_rq = NULL; | ||
2462 | |||
2463 | /* | ||
2464 | * If the tape is still busy, postpone our request and service | ||
2465 | * the other device meanwhile. | ||
2466 | */ | ||
2467 | status.all = HWIF(drive)->INB(IDE_STATUS_REG); | ||
2468 | |||
2469 | if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2)) | ||
2470 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); | ||
2471 | |||
2472 | if (drive->post_reset == 1) { | ||
2473 | set_bit(IDETAPE_IGNORE_DSC, &tape->flags); | ||
2474 | drive->post_reset = 0; | ||
2475 | } | ||
2476 | |||
2477 | if (tape->tape_still_time > 100 && tape->tape_still_time < 200) | ||
2478 | tape->measure_insert_time = 1; | ||
2479 | if (time_after(jiffies, tape->insert_time)) | ||
2480 | tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); | ||
2481 | calculate_speeds(drive); | ||
2482 | if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) && | ||
2483 | !status.b.dsc) { | ||
2484 | if (postponed_rq == NULL) { | ||
2485 | tape->dsc_polling_start = jiffies; | ||
2486 | tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; | ||
2487 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; | ||
2488 | } else if (time_after(jiffies, tape->dsc_timeout)) { | ||
2489 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | ||
2490 | tape->name); | ||
2491 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | ||
2492 | idetape_media_access_finished(drive); | ||
2493 | return ide_stopped; | ||
2494 | } else { | ||
2495 | return ide_do_reset(drive); | ||
2496 | } | ||
2497 | } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD) | ||
2498 | tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; | ||
2499 | idetape_postpone_request(drive); | ||
2500 | return ide_stopped; | ||
2501 | } | ||
2502 | if (rq->cmd[0] & REQ_IDETAPE_READ) { | ||
2503 | tape->buffer_head++; | ||
2504 | #if USE_IOTRACE | ||
2505 | IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); | ||
2506 | #endif | ||
2507 | tape->postpone_cnt = 0; | ||
2508 | pc = idetape_next_pc_storage(drive); | ||
2509 | idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); | ||
2510 | goto out; | ||
2511 | } | ||
2512 | if (rq->cmd[0] & REQ_IDETAPE_WRITE) { | ||
2513 | tape->buffer_head++; | ||
2514 | #if USE_IOTRACE | ||
2515 | IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); | ||
2516 | #endif | ||
2517 | tape->postpone_cnt = 0; | ||
2518 | pc = idetape_next_pc_storage(drive); | ||
2519 | idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); | ||
2520 | goto out; | ||
2521 | } | ||
2522 | if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) { | ||
2523 | tape->postpone_cnt = 0; | ||
2524 | pc = idetape_next_pc_storage(drive); | ||
2525 | idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special); | ||
2526 | goto out; | ||
2527 | } | ||
2528 | if (rq->cmd[0] & REQ_IDETAPE_PC1) { | ||
2529 | pc = (idetape_pc_t *) rq->buffer; | ||
2530 | rq->cmd[0] &= ~(REQ_IDETAPE_PC1); | ||
2531 | rq->cmd[0] |= REQ_IDETAPE_PC2; | ||
2532 | goto out; | ||
2533 | } | ||
2534 | if (rq->cmd[0] & REQ_IDETAPE_PC2) { | ||
2535 | idetape_media_access_finished(drive); | ||
2536 | return ide_stopped; | ||
2537 | } | ||
2538 | BUG(); | ||
2539 | out: | ||
2540 | return idetape_issue_packet_command(drive, pc); | ||
2541 | } | ||
2542 | |||
2543 | /* | ||
2544 | * Pipeline related functions | ||
2545 | */ | ||
2546 | static inline int idetape_pipeline_active (idetape_tape_t *tape) | ||
2547 | { | ||
2548 | int rc1, rc2; | ||
2549 | |||
2550 | rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); | ||
2551 | rc2 = (tape->active_data_request != NULL); | ||
2552 | return rc1; | ||
2553 | } | ||
2554 | |||
2555 | /* | ||
2556 | * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline | ||
2557 | * stage, along with all the necessary small buffers which together make | ||
2558 | * a buffer of size tape->stage_size (or a bit more). We attempt to | ||
2559 | * combine sequential pages as much as possible. | ||
2560 | * | ||
2561 | * Returns a pointer to the new allocated stage, or NULL if we | ||
2562 | * can't (or don't want to) allocate a stage. | ||
2563 | * | ||
2564 | * Pipeline stages are optional and are used to increase performance. | ||
2565 | * If we can't allocate them, we'll manage without them. | ||
2566 | */ | ||
2567 | static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) | ||
2568 | { | ||
2569 | idetape_stage_t *stage; | ||
2570 | struct idetape_bh *prev_bh, *bh; | ||
2571 | int pages = tape->pages_per_stage; | ||
2572 | char *b_data = NULL; | ||
2573 | |||
2574 | if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) | ||
2575 | return NULL; | ||
2576 | stage->next = NULL; | ||
2577 | |||
2578 | bh = stage->bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); | ||
2579 | if (bh == NULL) | ||
2580 | goto abort; | ||
2581 | bh->b_reqnext = NULL; | ||
2582 | if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) | ||
2583 | goto abort; | ||
2584 | if (clear) | ||
2585 | memset(bh->b_data, 0, PAGE_SIZE); | ||
2586 | bh->b_size = PAGE_SIZE; | ||
2587 | atomic_set(&bh->b_count, full ? bh->b_size : 0); | ||
2588 | |||
2589 | while (--pages) { | ||
2590 | if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL) | ||
2591 | goto abort; | ||
2592 | if (clear) | ||
2593 | memset(b_data, 0, PAGE_SIZE); | ||
2594 | if (bh->b_data == b_data + PAGE_SIZE) { | ||
2595 | bh->b_size += PAGE_SIZE; | ||
2596 | bh->b_data -= PAGE_SIZE; | ||
2597 | if (full) | ||
2598 | atomic_add(PAGE_SIZE, &bh->b_count); | ||
2599 | continue; | ||
2600 | } | ||
2601 | if (b_data == bh->b_data + bh->b_size) { | ||
2602 | bh->b_size += PAGE_SIZE; | ||
2603 | if (full) | ||
2604 | atomic_add(PAGE_SIZE, &bh->b_count); | ||
2605 | continue; | ||
2606 | } | ||
2607 | prev_bh = bh; | ||
2608 | if ((bh = (struct idetape_bh *)kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) { | ||
2609 | free_page((unsigned long) b_data); | ||
2610 | goto abort; | ||
2611 | } | ||
2612 | bh->b_reqnext = NULL; | ||
2613 | bh->b_data = b_data; | ||
2614 | bh->b_size = PAGE_SIZE; | ||
2615 | atomic_set(&bh->b_count, full ? bh->b_size : 0); | ||
2616 | prev_bh->b_reqnext = bh; | ||
2617 | } | ||
2618 | bh->b_size -= tape->excess_bh_size; | ||
2619 | if (full) | ||
2620 | atomic_sub(tape->excess_bh_size, &bh->b_count); | ||
2621 | return stage; | ||
2622 | abort: | ||
2623 | __idetape_kfree_stage(stage); | ||
2624 | return NULL; | ||
2625 | } | ||
2626 | |||
2627 | static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) | ||
2628 | { | ||
2629 | idetape_stage_t *cache_stage = tape->cache_stage; | ||
2630 | |||
2631 | #if IDETAPE_DEBUG_LOG | ||
2632 | if (tape->debug_level >= 4) | ||
2633 | printk(KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); | ||
2634 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2635 | |||
2636 | if (tape->nr_stages >= tape->max_stages) | ||
2637 | return NULL; | ||
2638 | if (cache_stage != NULL) { | ||
2639 | tape->cache_stage = NULL; | ||
2640 | return cache_stage; | ||
2641 | } | ||
2642 | return __idetape_kmalloc_stage(tape, 0, 0); | ||
2643 | } | ||
2644 | |||
2645 | static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n) | ||
2646 | { | ||
2647 | struct idetape_bh *bh = tape->bh; | ||
2648 | int count; | ||
2649 | |||
2650 | while (n) { | ||
2651 | #if IDETAPE_DEBUG_BUGS | ||
2652 | if (bh == NULL) { | ||
2653 | printk(KERN_ERR "ide-tape: bh == NULL in " | ||
2654 | "idetape_copy_stage_from_user\n"); | ||
2655 | return; | ||
2656 | } | ||
2657 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
2658 | count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n); | ||
2659 | copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count); | ||
2660 | n -= count; | ||
2661 | atomic_add(count, &bh->b_count); | ||
2662 | buf += count; | ||
2663 | if (atomic_read(&bh->b_count) == bh->b_size) { | ||
2664 | bh = bh->b_reqnext; | ||
2665 | if (bh) | ||
2666 | atomic_set(&bh->b_count, 0); | ||
2667 | } | ||
2668 | } | ||
2669 | tape->bh = bh; | ||
2670 | } | ||
2671 | |||
2672 | static void idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n) | ||
2673 | { | ||
2674 | struct idetape_bh *bh = tape->bh; | ||
2675 | int count; | ||
2676 | |||
2677 | while (n) { | ||
2678 | #if IDETAPE_DEBUG_BUGS | ||
2679 | if (bh == NULL) { | ||
2680 | printk(KERN_ERR "ide-tape: bh == NULL in " | ||
2681 | "idetape_copy_stage_to_user\n"); | ||
2682 | return; | ||
2683 | } | ||
2684 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
2685 | count = min(tape->b_count, n); | ||
2686 | copy_to_user(buf, tape->b_data, count); | ||
2687 | n -= count; | ||
2688 | tape->b_data += count; | ||
2689 | tape->b_count -= count; | ||
2690 | buf += count; | ||
2691 | if (!tape->b_count) { | ||
2692 | tape->bh = bh = bh->b_reqnext; | ||
2693 | if (bh) { | ||
2694 | tape->b_data = bh->b_data; | ||
2695 | tape->b_count = atomic_read(&bh->b_count); | ||
2696 | } | ||
2697 | } | ||
2698 | } | ||
2699 | } | ||
2700 | |||
2701 | static void idetape_init_merge_stage (idetape_tape_t *tape) | ||
2702 | { | ||
2703 | struct idetape_bh *bh = tape->merge_stage->bh; | ||
2704 | |||
2705 | tape->bh = bh; | ||
2706 | if (tape->chrdev_direction == idetape_direction_write) | ||
2707 | atomic_set(&bh->b_count, 0); | ||
2708 | else { | ||
2709 | tape->b_data = bh->b_data; | ||
2710 | tape->b_count = atomic_read(&bh->b_count); | ||
2711 | } | ||
2712 | } | ||
2713 | |||
2714 | static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) | ||
2715 | { | ||
2716 | struct idetape_bh *tmp; | ||
2717 | |||
2718 | tmp = stage->bh; | ||
2719 | stage->bh = tape->merge_stage->bh; | ||
2720 | tape->merge_stage->bh = tmp; | ||
2721 | idetape_init_merge_stage(tape); | ||
2722 | } | ||
2723 | |||
2724 | /* | ||
2725 | * idetape_add_stage_tail adds a new stage at the end of the pipeline. | ||
2726 | */ | ||
2727 | static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) | ||
2728 | { | ||
2729 | idetape_tape_t *tape = drive->driver_data; | ||
2730 | unsigned long flags; | ||
2731 | |||
2732 | #if IDETAPE_DEBUG_LOG | ||
2733 | if (tape->debug_level >= 4) | ||
2734 | printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); | ||
2735 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2736 | spin_lock_irqsave(&tape->spinlock, flags); | ||
2737 | stage->next = NULL; | ||
2738 | if (tape->last_stage != NULL) | ||
2739 | tape->last_stage->next=stage; | ||
2740 | else | ||
2741 | tape->first_stage = tape->next_stage=stage; | ||
2742 | tape->last_stage = stage; | ||
2743 | if (tape->next_stage == NULL) | ||
2744 | tape->next_stage = tape->last_stage; | ||
2745 | tape->nr_stages++; | ||
2746 | tape->nr_pending_stages++; | ||
2747 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
2748 | } | ||
2749 | |||
2750 | /* | ||
2751 | * idetape_wait_for_request installs a completion in a pending request | ||
2752 | * and sleeps until it is serviced. | ||
2753 | * | ||
2754 | * The caller should ensure that the request will not be serviced | ||
2755 | * before we install the completion (usually by disabling interrupts). | ||
2756 | */ | ||
2757 | static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) | ||
2758 | { | ||
2759 | DECLARE_COMPLETION(wait); | ||
2760 | idetape_tape_t *tape = drive->driver_data; | ||
2761 | |||
2762 | #if IDETAPE_DEBUG_BUGS | ||
2763 | if (rq == NULL || (rq->flags & REQ_SPECIAL) == 0) { | ||
2764 | printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); | ||
2765 | return; | ||
2766 | } | ||
2767 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
2768 | rq->waiting = &wait; | ||
2769 | rq->end_io = blk_end_sync_rq; | ||
2770 | spin_unlock_irq(&tape->spinlock); | ||
2771 | wait_for_completion(&wait); | ||
2772 | /* The stage and its struct request have been deallocated */ | ||
2773 | spin_lock_irq(&tape->spinlock); | ||
2774 | } | ||
2775 | |||
2776 | static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) | ||
2777 | { | ||
2778 | idetape_tape_t *tape = drive->driver_data; | ||
2779 | idetape_read_position_result_t *result; | ||
2780 | |||
2781 | #if IDETAPE_DEBUG_LOG | ||
2782 | if (tape->debug_level >= 4) | ||
2783 | printk(KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); | ||
2784 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2785 | |||
2786 | if (!tape->pc->error) { | ||
2787 | result = (idetape_read_position_result_t *) tape->pc->buffer; | ||
2788 | #if IDETAPE_DEBUG_LOG | ||
2789 | if (tape->debug_level >= 2) | ||
2790 | printk(KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); | ||
2791 | if (tape->debug_level >= 2) | ||
2792 | printk(KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); | ||
2793 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2794 | if (result->bpu) { | ||
2795 | printk(KERN_INFO "ide-tape: Block location is unknown to the tape\n"); | ||
2796 | clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags); | ||
2797 | idetape_end_request(drive, 0, 0); | ||
2798 | } else { | ||
2799 | #if IDETAPE_DEBUG_LOG | ||
2800 | if (tape->debug_level >= 2) | ||
2801 | printk(KERN_INFO "ide-tape: Block Location - %u\n", ntohl(result->first_block)); | ||
2802 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2803 | tape->partition = result->partition; | ||
2804 | tape->first_frame_position = ntohl(result->first_block); | ||
2805 | tape->last_frame_position = ntohl(result->last_block); | ||
2806 | tape->blocks_in_buffer = result->blocks_in_buffer[2]; | ||
2807 | set_bit(IDETAPE_ADDRESS_VALID, &tape->flags); | ||
2808 | idetape_end_request(drive, 1, 0); | ||
2809 | } | ||
2810 | } else { | ||
2811 | idetape_end_request(drive, 0, 0); | ||
2812 | } | ||
2813 | return ide_stopped; | ||
2814 | } | ||
2815 | |||
2816 | /* | ||
2817 | * idetape_create_write_filemark_cmd will: | ||
2818 | * | ||
2819 | * 1. Write a filemark if write_filemark=1. | ||
2820 | * 2. Flush the device buffers without writing a filemark | ||
2821 | * if write_filemark=0. | ||
2822 | * | ||
2823 | */ | ||
2824 | static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) | ||
2825 | { | ||
2826 | idetape_init_pc(pc); | ||
2827 | pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; | ||
2828 | pc->c[4] = write_filemark; | ||
2829 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | ||
2830 | pc->callback = &idetape_pc_callback; | ||
2831 | } | ||
2832 | |||
2833 | static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) | ||
2834 | { | ||
2835 | idetape_init_pc(pc); | ||
2836 | pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; | ||
2837 | pc->callback = &idetape_pc_callback; | ||
2838 | } | ||
2839 | |||
2840 | /* | ||
2841 | * idetape_queue_pc_tail is based on the following functions: | ||
2842 | * | ||
2843 | * ide_do_drive_cmd from ide.c | ||
2844 | * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c | ||
2845 | * | ||
2846 | * We add a special packet command request to the tail of the request | ||
2847 | * queue, and wait for it to be serviced. | ||
2848 | * | ||
2849 | * This is not to be called from within the request handling part | ||
2850 | * of the driver ! We allocate here data in the stack, and it is valid | ||
2851 | * until the request is finished. This is not the case for the bottom | ||
2852 | * part of the driver, where we are always leaving the functions to wait | ||
2853 | * for an interrupt or a timer event. | ||
2854 | * | ||
2855 | * From the bottom part of the driver, we should allocate safe memory | ||
2856 | * using idetape_next_pc_storage and idetape_next_rq_storage, and add | ||
2857 | * the request to the request list without waiting for it to be serviced ! | ||
2858 | * In that case, we usually use idetape_queue_pc_head. | ||
2859 | */ | ||
2860 | static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) | ||
2861 | { | ||
2862 | struct ide_tape_obj *tape = drive->driver_data; | ||
2863 | struct request rq; | ||
2864 | |||
2865 | idetape_init_rq(&rq, REQ_IDETAPE_PC1); | ||
2866 | rq.buffer = (char *) pc; | ||
2867 | rq.rq_disk = tape->disk; | ||
2868 | return ide_do_drive_cmd(drive, &rq, ide_wait); | ||
2869 | } | ||
2870 | |||
2871 | static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) | ||
2872 | { | ||
2873 | idetape_init_pc(pc); | ||
2874 | pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; | ||
2875 | pc->c[4] = cmd; | ||
2876 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | ||
2877 | pc->callback = &idetape_pc_callback; | ||
2878 | } | ||
2879 | |||
2880 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | ||
2881 | { | ||
2882 | idetape_tape_t *tape = drive->driver_data; | ||
2883 | idetape_pc_t pc; | ||
2884 | int load_attempted = 0; | ||
2885 | |||
2886 | /* | ||
2887 | * Wait for the tape to become ready | ||
2888 | */ | ||
2889 | set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); | ||
2890 | timeout += jiffies; | ||
2891 | while (time_before(jiffies, timeout)) { | ||
2892 | idetape_create_test_unit_ready_cmd(&pc); | ||
2893 | if (!__idetape_queue_pc_tail(drive, &pc)) | ||
2894 | return 0; | ||
2895 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | ||
2896 | || (tape->asc == 0x3A)) { /* no media */ | ||
2897 | if (load_attempted) | ||
2898 | return -ENOMEDIUM; | ||
2899 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); | ||
2900 | __idetape_queue_pc_tail(drive, &pc); | ||
2901 | load_attempted = 1; | ||
2902 | /* not about to be ready */ | ||
2903 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | ||
2904 | (tape->ascq == 1 || tape->ascq == 8))) | ||
2905 | return -EIO; | ||
2906 | current->state = TASK_INTERRUPTIBLE; | ||
2907 | schedule_timeout(HZ / 10); | ||
2908 | } | ||
2909 | return -EIO; | ||
2910 | } | ||
2911 | |||
2912 | static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) | ||
2913 | { | ||
2914 | return __idetape_queue_pc_tail(drive, pc); | ||
2915 | } | ||
2916 | |||
2917 | static int idetape_flush_tape_buffers (ide_drive_t *drive) | ||
2918 | { | ||
2919 | idetape_pc_t pc; | ||
2920 | int rc; | ||
2921 | |||
2922 | idetape_create_write_filemark_cmd(drive, &pc, 0); | ||
2923 | if ((rc = idetape_queue_pc_tail(drive, &pc))) | ||
2924 | return rc; | ||
2925 | idetape_wait_ready(drive, 60 * 5 * HZ); | ||
2926 | return 0; | ||
2927 | } | ||
2928 | |||
2929 | static void idetape_create_read_position_cmd (idetape_pc_t *pc) | ||
2930 | { | ||
2931 | idetape_init_pc(pc); | ||
2932 | pc->c[0] = IDETAPE_READ_POSITION_CMD; | ||
2933 | pc->request_transfer = 20; | ||
2934 | pc->callback = &idetape_read_position_callback; | ||
2935 | } | ||
2936 | |||
2937 | static int idetape_read_position (ide_drive_t *drive) | ||
2938 | { | ||
2939 | idetape_tape_t *tape = drive->driver_data; | ||
2940 | idetape_pc_t pc; | ||
2941 | int position; | ||
2942 | |||
2943 | #if IDETAPE_DEBUG_LOG | ||
2944 | if (tape->debug_level >= 4) | ||
2945 | printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); | ||
2946 | #endif /* IDETAPE_DEBUG_LOG */ | ||
2947 | |||
2948 | idetape_create_read_position_cmd(&pc); | ||
2949 | if (idetape_queue_pc_tail(drive, &pc)) | ||
2950 | return -1; | ||
2951 | position = tape->first_frame_position; | ||
2952 | return position; | ||
2953 | } | ||
2954 | |||
2955 | static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) | ||
2956 | { | ||
2957 | idetape_init_pc(pc); | ||
2958 | pc->c[0] = IDETAPE_LOCATE_CMD; | ||
2959 | pc->c[1] = 2; | ||
2960 | put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); | ||
2961 | pc->c[8] = partition; | ||
2962 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | ||
2963 | pc->callback = &idetape_pc_callback; | ||
2964 | } | ||
2965 | |||
2966 | static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) | ||
2967 | { | ||
2968 | idetape_tape_t *tape = drive->driver_data; | ||
2969 | |||
2970 | if (!tape->capabilities.lock) | ||
2971 | return 0; | ||
2972 | |||
2973 | idetape_init_pc(pc); | ||
2974 | pc->c[0] = IDETAPE_PREVENT_CMD; | ||
2975 | pc->c[4] = prevent; | ||
2976 | pc->callback = &idetape_pc_callback; | ||
2977 | return 1; | ||
2978 | } | ||
2979 | |||
2980 | static int __idetape_discard_read_pipeline (ide_drive_t *drive) | ||
2981 | { | ||
2982 | idetape_tape_t *tape = drive->driver_data; | ||
2983 | unsigned long flags; | ||
2984 | int cnt; | ||
2985 | |||
2986 | if (tape->chrdev_direction != idetape_direction_read) | ||
2987 | return 0; | ||
2988 | |||
2989 | /* Remove merge stage. */ | ||
2990 | cnt = tape->merge_stage_size / tape->tape_block_size; | ||
2991 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) | ||
2992 | ++cnt; /* Filemarks count as 1 sector */ | ||
2993 | tape->merge_stage_size = 0; | ||
2994 | if (tape->merge_stage != NULL) { | ||
2995 | __idetape_kfree_stage(tape->merge_stage); | ||
2996 | tape->merge_stage = NULL; | ||
2997 | } | ||
2998 | |||
2999 | /* Clear pipeline flags. */ | ||
3000 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | ||
3001 | tape->chrdev_direction = idetape_direction_none; | ||
3002 | |||
3003 | /* Remove pipeline stages. */ | ||
3004 | if (tape->first_stage == NULL) | ||
3005 | return 0; | ||
3006 | |||
3007 | spin_lock_irqsave(&tape->spinlock, flags); | ||
3008 | tape->next_stage = NULL; | ||
3009 | if (idetape_pipeline_active(tape)) | ||
3010 | idetape_wait_for_request(drive, tape->active_data_request); | ||
3011 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3012 | |||
3013 | while (tape->first_stage != NULL) { | ||
3014 | struct request *rq_ptr = &tape->first_stage->rq; | ||
3015 | |||
3016 | cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; | ||
3017 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) | ||
3018 | ++cnt; | ||
3019 | idetape_remove_stage_head(drive); | ||
3020 | } | ||
3021 | tape->nr_pending_stages = 0; | ||
3022 | tape->max_stages = tape->min_pipeline; | ||
3023 | return cnt; | ||
3024 | } | ||
3025 | |||
3026 | /* | ||
3027 | * idetape_position_tape positions the tape to the requested block | ||
3028 | * using the LOCATE packet command. A READ POSITION command is then | ||
3029 | * issued to check where we are positioned. | ||
3030 | * | ||
3031 | * Like all higher level operations, we queue the commands at the tail | ||
3032 | * of the request queue and wait for their completion. | ||
3033 | * | ||
3034 | */ | ||
3035 | static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) | ||
3036 | { | ||
3037 | idetape_tape_t *tape = drive->driver_data; | ||
3038 | int retval; | ||
3039 | idetape_pc_t pc; | ||
3040 | |||
3041 | if (tape->chrdev_direction == idetape_direction_read) | ||
3042 | __idetape_discard_read_pipeline(drive); | ||
3043 | idetape_wait_ready(drive, 60 * 5 * HZ); | ||
3044 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | ||
3045 | retval = idetape_queue_pc_tail(drive, &pc); | ||
3046 | if (retval) | ||
3047 | return (retval); | ||
3048 | |||
3049 | idetape_create_read_position_cmd(&pc); | ||
3050 | return (idetape_queue_pc_tail(drive, &pc)); | ||
3051 | } | ||
3052 | |||
3053 | static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) | ||
3054 | { | ||
3055 | idetape_tape_t *tape = drive->driver_data; | ||
3056 | int cnt; | ||
3057 | int seek, position; | ||
3058 | |||
3059 | cnt = __idetape_discard_read_pipeline(drive); | ||
3060 | if (restore_position) { | ||
3061 | position = idetape_read_position(drive); | ||
3062 | seek = position > cnt ? position - cnt : 0; | ||
3063 | if (idetape_position_tape(drive, seek, 0, 0)) { | ||
3064 | printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); | ||
3065 | return; | ||
3066 | } | ||
3067 | } | ||
3068 | } | ||
3069 | |||
3070 | /* | ||
3071 | * idetape_queue_rw_tail generates a read/write request for the block | ||
3072 | * device interface and wait for it to be serviced. | ||
3073 | */ | ||
3074 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) | ||
3075 | { | ||
3076 | idetape_tape_t *tape = drive->driver_data; | ||
3077 | struct request rq; | ||
3078 | |||
3079 | #if IDETAPE_DEBUG_LOG | ||
3080 | if (tape->debug_level >= 2) | ||
3081 | printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); | ||
3082 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3083 | #if IDETAPE_DEBUG_BUGS | ||
3084 | if (idetape_pipeline_active(tape)) { | ||
3085 | printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); | ||
3086 | return (0); | ||
3087 | } | ||
3088 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3089 | |||
3090 | idetape_init_rq(&rq, cmd); | ||
3091 | rq.rq_disk = tape->disk; | ||
3092 | rq.special = (void *)bh; | ||
3093 | rq.sector = tape->first_frame_position; | ||
3094 | rq.nr_sectors = rq.current_nr_sectors = blocks; | ||
3095 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); | ||
3096 | |||
3097 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | ||
3098 | return 0; | ||
3099 | |||
3100 | if (tape->merge_stage) | ||
3101 | idetape_init_merge_stage(tape); | ||
3102 | if (rq.errors == IDETAPE_ERROR_GENERAL) | ||
3103 | return -EIO; | ||
3104 | return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); | ||
3105 | } | ||
3106 | |||
3107 | /* | ||
3108 | * idetape_insert_pipeline_into_queue is used to start servicing the | ||
3109 | * pipeline stages, starting from tape->next_stage. | ||
3110 | */ | ||
3111 | static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) | ||
3112 | { | ||
3113 | idetape_tape_t *tape = drive->driver_data; | ||
3114 | |||
3115 | if (tape->next_stage == NULL) | ||
3116 | return; | ||
3117 | if (!idetape_pipeline_active(tape)) { | ||
3118 | set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); | ||
3119 | idetape_active_next_stage(drive); | ||
3120 | (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); | ||
3121 | } | ||
3122 | } | ||
3123 | |||
3124 | static void idetape_create_inquiry_cmd (idetape_pc_t *pc) | ||
3125 | { | ||
3126 | idetape_init_pc(pc); | ||
3127 | pc->c[0] = IDETAPE_INQUIRY_CMD; | ||
3128 | pc->c[4] = pc->request_transfer = 254; | ||
3129 | pc->callback = &idetape_pc_callback; | ||
3130 | } | ||
3131 | |||
3132 | static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) | ||
3133 | { | ||
3134 | idetape_init_pc(pc); | ||
3135 | pc->c[0] = IDETAPE_REWIND_CMD; | ||
3136 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | ||
3137 | pc->callback = &idetape_pc_callback; | ||
3138 | } | ||
3139 | |||
3140 | #if 0 | ||
3141 | static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) | ||
3142 | { | ||
3143 | idetape_init_pc(pc); | ||
3144 | set_bit(PC_WRITING, &pc->flags); | ||
3145 | pc->c[0] = IDETAPE_MODE_SELECT_CMD; | ||
3146 | pc->c[1] = 0x10; | ||
3147 | put_unaligned(htons(length), (unsigned short *) &pc->c[3]); | ||
3148 | pc->request_transfer = 255; | ||
3149 | pc->callback = &idetape_pc_callback; | ||
3150 | } | ||
3151 | #endif | ||
3152 | |||
3153 | static void idetape_create_erase_cmd (idetape_pc_t *pc) | ||
3154 | { | ||
3155 | idetape_init_pc(pc); | ||
3156 | pc->c[0] = IDETAPE_ERASE_CMD; | ||
3157 | pc->c[1] = 1; | ||
3158 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | ||
3159 | pc->callback = &idetape_pc_callback; | ||
3160 | } | ||
3161 | |||
3162 | static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) | ||
3163 | { | ||
3164 | idetape_init_pc(pc); | ||
3165 | pc->c[0] = IDETAPE_SPACE_CMD; | ||
3166 | put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); | ||
3167 | pc->c[1] = cmd; | ||
3168 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | ||
3169 | pc->callback = &idetape_pc_callback; | ||
3170 | } | ||
3171 | |||
3172 | static void idetape_wait_first_stage (ide_drive_t *drive) | ||
3173 | { | ||
3174 | idetape_tape_t *tape = drive->driver_data; | ||
3175 | unsigned long flags; | ||
3176 | |||
3177 | if (tape->first_stage == NULL) | ||
3178 | return; | ||
3179 | spin_lock_irqsave(&tape->spinlock, flags); | ||
3180 | if (tape->active_stage == tape->first_stage) | ||
3181 | idetape_wait_for_request(drive, tape->active_data_request); | ||
3182 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3183 | } | ||
3184 | |||
3185 | /* | ||
3186 | * idetape_add_chrdev_write_request tries to add a character device | ||
3187 | * originated write request to our pipeline. In case we don't succeed, | ||
3188 | * we revert to non-pipelined operation mode for this request. | ||
3189 | * | ||
3190 | * 1. Try to allocate a new pipeline stage. | ||
3191 | * 2. If we can't, wait for more and more requests to be serviced | ||
3192 | * and try again each time. | ||
3193 | * 3. If we still can't allocate a stage, fallback to | ||
3194 | * non-pipelined operation mode for this request. | ||
3195 | */ | ||
3196 | static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) | ||
3197 | { | ||
3198 | idetape_tape_t *tape = drive->driver_data; | ||
3199 | idetape_stage_t *new_stage; | ||
3200 | unsigned long flags; | ||
3201 | struct request *rq; | ||
3202 | |||
3203 | #if IDETAPE_DEBUG_LOG | ||
3204 | if (tape->debug_level >= 3) | ||
3205 | printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); | ||
3206 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3207 | |||
3208 | /* | ||
3209 | * Attempt to allocate a new stage. | ||
3210 | * Pay special attention to possible race conditions. | ||
3211 | */ | ||
3212 | while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { | ||
3213 | spin_lock_irqsave(&tape->spinlock, flags); | ||
3214 | if (idetape_pipeline_active(tape)) { | ||
3215 | idetape_wait_for_request(drive, tape->active_data_request); | ||
3216 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3217 | } else { | ||
3218 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3219 | idetape_insert_pipeline_into_queue(drive); | ||
3220 | if (idetape_pipeline_active(tape)) | ||
3221 | continue; | ||
3222 | /* | ||
3223 | * Linux is short on memory. Fallback to | ||
3224 | * non-pipelined operation mode for this request. | ||
3225 | */ | ||
3226 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); | ||
3227 | } | ||
3228 | } | ||
3229 | rq = &new_stage->rq; | ||
3230 | idetape_init_rq(rq, REQ_IDETAPE_WRITE); | ||
3231 | /* Doesn't actually matter - We always assume sequential access */ | ||
3232 | rq->sector = tape->first_frame_position; | ||
3233 | rq->nr_sectors = rq->current_nr_sectors = blocks; | ||
3234 | |||
3235 | idetape_switch_buffers(tape, new_stage); | ||
3236 | idetape_add_stage_tail(drive, new_stage); | ||
3237 | tape->pipeline_head++; | ||
3238 | #if USE_IOTRACE | ||
3239 | IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); | ||
3240 | #endif | ||
3241 | calculate_speeds(drive); | ||
3242 | |||
3243 | /* | ||
3244 | * Estimate whether the tape has stopped writing by checking | ||
3245 | * if our write pipeline is currently empty. If we are not | ||
3246 | * writing anymore, wait for the pipeline to be full enough | ||
3247 | * (90%) before starting to service requests, so that we will | ||
3248 | * be able to keep up with the higher speeds of the tape. | ||
3249 | */ | ||
3250 | if (!idetape_pipeline_active(tape)) { | ||
3251 | if (tape->nr_stages >= tape->max_stages * 9 / 10 || | ||
3252 | tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { | ||
3253 | tape->measure_insert_time = 1; | ||
3254 | tape->insert_time = jiffies; | ||
3255 | tape->insert_size = 0; | ||
3256 | tape->insert_speed = 0; | ||
3257 | idetape_insert_pipeline_into_queue(drive); | ||
3258 | } | ||
3259 | } | ||
3260 | if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) | ||
3261 | /* Return a deferred error */ | ||
3262 | return -EIO; | ||
3263 | return blocks; | ||
3264 | } | ||
3265 | |||
3266 | /* | ||
3267 | * idetape_wait_for_pipeline will wait until all pending pipeline | ||
3268 | * requests are serviced. Typically called on device close. | ||
3269 | */ | ||
3270 | static void idetape_wait_for_pipeline (ide_drive_t *drive) | ||
3271 | { | ||
3272 | idetape_tape_t *tape = drive->driver_data; | ||
3273 | unsigned long flags; | ||
3274 | |||
3275 | while (tape->next_stage || idetape_pipeline_active(tape)) { | ||
3276 | idetape_insert_pipeline_into_queue(drive); | ||
3277 | spin_lock_irqsave(&tape->spinlock, flags); | ||
3278 | if (idetape_pipeline_active(tape)) | ||
3279 | idetape_wait_for_request(drive, tape->active_data_request); | ||
3280 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3281 | } | ||
3282 | } | ||
3283 | |||
3284 | static void idetape_empty_write_pipeline (ide_drive_t *drive) | ||
3285 | { | ||
3286 | idetape_tape_t *tape = drive->driver_data; | ||
3287 | int blocks, min; | ||
3288 | struct idetape_bh *bh; | ||
3289 | |||
3290 | #if IDETAPE_DEBUG_BUGS | ||
3291 | if (tape->chrdev_direction != idetape_direction_write) { | ||
3292 | printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); | ||
3293 | return; | ||
3294 | } | ||
3295 | if (tape->merge_stage_size > tape->stage_size) { | ||
3296 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); | ||
3297 | tape->merge_stage_size = tape->stage_size; | ||
3298 | } | ||
3299 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3300 | if (tape->merge_stage_size) { | ||
3301 | blocks = tape->merge_stage_size / tape->tape_block_size; | ||
3302 | if (tape->merge_stage_size % tape->tape_block_size) { | ||
3303 | unsigned int i; | ||
3304 | |||
3305 | blocks++; | ||
3306 | i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; | ||
3307 | bh = tape->bh->b_reqnext; | ||
3308 | while (bh) { | ||
3309 | atomic_set(&bh->b_count, 0); | ||
3310 | bh = bh->b_reqnext; | ||
3311 | } | ||
3312 | bh = tape->bh; | ||
3313 | while (i) { | ||
3314 | if (bh == NULL) { | ||
3315 | |||
3316 | printk(KERN_INFO "ide-tape: bug, bh NULL\n"); | ||
3317 | break; | ||
3318 | } | ||
3319 | min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); | ||
3320 | memset(bh->b_data + atomic_read(&bh->b_count), 0, min); | ||
3321 | atomic_add(min, &bh->b_count); | ||
3322 | i -= min; | ||
3323 | bh = bh->b_reqnext; | ||
3324 | } | ||
3325 | } | ||
3326 | (void) idetape_add_chrdev_write_request(drive, blocks); | ||
3327 | tape->merge_stage_size = 0; | ||
3328 | } | ||
3329 | idetape_wait_for_pipeline(drive); | ||
3330 | if (tape->merge_stage != NULL) { | ||
3331 | __idetape_kfree_stage(tape->merge_stage); | ||
3332 | tape->merge_stage = NULL; | ||
3333 | } | ||
3334 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | ||
3335 | tape->chrdev_direction = idetape_direction_none; | ||
3336 | |||
3337 | /* | ||
3338 | * On the next backup, perform the feedback loop again. | ||
3339 | * (I don't want to keep sense information between backups, | ||
3340 | * as some systems are constantly on, and the system load | ||
3341 | * can be totally different on the next backup). | ||
3342 | */ | ||
3343 | tape->max_stages = tape->min_pipeline; | ||
3344 | #if IDETAPE_DEBUG_BUGS | ||
3345 | if (tape->first_stage != NULL || | ||
3346 | tape->next_stage != NULL || | ||
3347 | tape->last_stage != NULL || | ||
3348 | tape->nr_stages != 0) { | ||
3349 | printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " | ||
3350 | "first_stage %p, next_stage %p, " | ||
3351 | "last_stage %p, nr_stages %d\n", | ||
3352 | tape->first_stage, tape->next_stage, | ||
3353 | tape->last_stage, tape->nr_stages); | ||
3354 | } | ||
3355 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3356 | } | ||
3357 | |||
3358 | static void idetape_restart_speed_control (ide_drive_t *drive) | ||
3359 | { | ||
3360 | idetape_tape_t *tape = drive->driver_data; | ||
3361 | |||
3362 | tape->restart_speed_control_req = 0; | ||
3363 | tape->pipeline_head = 0; | ||
3364 | tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; | ||
3365 | tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; | ||
3366 | tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; | ||
3367 | tape->uncontrolled_pipeline_head_speed = 0; | ||
3368 | tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; | ||
3369 | tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; | ||
3370 | } | ||
3371 | |||
3372 | static int idetape_initiate_read (ide_drive_t *drive, int max_stages) | ||
3373 | { | ||
3374 | idetape_tape_t *tape = drive->driver_data; | ||
3375 | idetape_stage_t *new_stage; | ||
3376 | struct request rq; | ||
3377 | int bytes_read; | ||
3378 | int blocks = tape->capabilities.ctl; | ||
3379 | |||
3380 | /* Initialize read operation */ | ||
3381 | if (tape->chrdev_direction != idetape_direction_read) { | ||
3382 | if (tape->chrdev_direction == idetape_direction_write) { | ||
3383 | idetape_empty_write_pipeline(drive); | ||
3384 | idetape_flush_tape_buffers(drive); | ||
3385 | } | ||
3386 | #if IDETAPE_DEBUG_BUGS | ||
3387 | if (tape->merge_stage || tape->merge_stage_size) { | ||
3388 | printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); | ||
3389 | tape->merge_stage_size = 0; | ||
3390 | } | ||
3391 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3392 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) | ||
3393 | return -ENOMEM; | ||
3394 | tape->chrdev_direction = idetape_direction_read; | ||
3395 | |||
3396 | /* | ||
3397 | * Issue a read 0 command to ensure that DSC handshake | ||
3398 | * is switched from completion mode to buffer available | ||
3399 | * mode. | ||
3400 | * No point in issuing this if DSC overlap isn't supported, | ||
3401 | * some drives (Seagate STT3401A) will return an error. | ||
3402 | */ | ||
3403 | if (drive->dsc_overlap) { | ||
3404 | bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); | ||
3405 | if (bytes_read < 0) { | ||
3406 | __idetape_kfree_stage(tape->merge_stage); | ||
3407 | tape->merge_stage = NULL; | ||
3408 | tape->chrdev_direction = idetape_direction_none; | ||
3409 | return bytes_read; | ||
3410 | } | ||
3411 | } | ||
3412 | } | ||
3413 | if (tape->restart_speed_control_req) | ||
3414 | idetape_restart_speed_control(drive); | ||
3415 | idetape_init_rq(&rq, REQ_IDETAPE_READ); | ||
3416 | rq.sector = tape->first_frame_position; | ||
3417 | rq.nr_sectors = rq.current_nr_sectors = blocks; | ||
3418 | if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && | ||
3419 | tape->nr_stages < max_stages) { | ||
3420 | new_stage = idetape_kmalloc_stage(tape); | ||
3421 | while (new_stage != NULL) { | ||
3422 | new_stage->rq = rq; | ||
3423 | idetape_add_stage_tail(drive, new_stage); | ||
3424 | if (tape->nr_stages >= max_stages) | ||
3425 | break; | ||
3426 | new_stage = idetape_kmalloc_stage(tape); | ||
3427 | } | ||
3428 | } | ||
3429 | if (!idetape_pipeline_active(tape)) { | ||
3430 | if (tape->nr_pending_stages >= 3 * max_stages / 4) { | ||
3431 | tape->measure_insert_time = 1; | ||
3432 | tape->insert_time = jiffies; | ||
3433 | tape->insert_size = 0; | ||
3434 | tape->insert_speed = 0; | ||
3435 | idetape_insert_pipeline_into_queue(drive); | ||
3436 | } | ||
3437 | } | ||
3438 | return 0; | ||
3439 | } | ||
3440 | |||
3441 | /* | ||
3442 | * idetape_add_chrdev_read_request is called from idetape_chrdev_read | ||
3443 | * to service a character device read request and add read-ahead | ||
3444 | * requests to our pipeline. | ||
3445 | */ | ||
3446 | static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) | ||
3447 | { | ||
3448 | idetape_tape_t *tape = drive->driver_data; | ||
3449 | unsigned long flags; | ||
3450 | struct request *rq_ptr; | ||
3451 | int bytes_read; | ||
3452 | |||
3453 | #if IDETAPE_DEBUG_LOG | ||
3454 | if (tape->debug_level >= 4) | ||
3455 | printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); | ||
3456 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3457 | |||
3458 | /* | ||
3459 | * If we are at a filemark, return a read length of 0 | ||
3460 | */ | ||
3461 | if (test_bit(IDETAPE_FILEMARK, &tape->flags)) | ||
3462 | return 0; | ||
3463 | |||
3464 | /* | ||
3465 | * Wait for the next block to be available at the head | ||
3466 | * of the pipeline | ||
3467 | */ | ||
3468 | idetape_initiate_read(drive, tape->max_stages); | ||
3469 | if (tape->first_stage == NULL) { | ||
3470 | if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) | ||
3471 | return 0; | ||
3472 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); | ||
3473 | } | ||
3474 | idetape_wait_first_stage(drive); | ||
3475 | rq_ptr = &tape->first_stage->rq; | ||
3476 | bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); | ||
3477 | rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; | ||
3478 | |||
3479 | |||
3480 | if (rq_ptr->errors == IDETAPE_ERROR_EOD) | ||
3481 | return 0; | ||
3482 | else { | ||
3483 | idetape_switch_buffers(tape, tape->first_stage); | ||
3484 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) | ||
3485 | set_bit(IDETAPE_FILEMARK, &tape->flags); | ||
3486 | spin_lock_irqsave(&tape->spinlock, flags); | ||
3487 | idetape_remove_stage_head(drive); | ||
3488 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3489 | tape->pipeline_head++; | ||
3490 | #if USE_IOTRACE | ||
3491 | IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); | ||
3492 | #endif | ||
3493 | calculate_speeds(drive); | ||
3494 | } | ||
3495 | #if IDETAPE_DEBUG_BUGS | ||
3496 | if (bytes_read > blocks * tape->tape_block_size) { | ||
3497 | printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); | ||
3498 | bytes_read = blocks * tape->tape_block_size; | ||
3499 | } | ||
3500 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3501 | return (bytes_read); | ||
3502 | } | ||
3503 | |||
3504 | static void idetape_pad_zeros (ide_drive_t *drive, int bcount) | ||
3505 | { | ||
3506 | idetape_tape_t *tape = drive->driver_data; | ||
3507 | struct idetape_bh *bh; | ||
3508 | int blocks; | ||
3509 | |||
3510 | while (bcount) { | ||
3511 | unsigned int count; | ||
3512 | |||
3513 | bh = tape->merge_stage->bh; | ||
3514 | count = min(tape->stage_size, bcount); | ||
3515 | bcount -= count; | ||
3516 | blocks = count / tape->tape_block_size; | ||
3517 | while (count) { | ||
3518 | atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); | ||
3519 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); | ||
3520 | count -= atomic_read(&bh->b_count); | ||
3521 | bh = bh->b_reqnext; | ||
3522 | } | ||
3523 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); | ||
3524 | } | ||
3525 | } | ||
3526 | |||
3527 | static int idetape_pipeline_size (ide_drive_t *drive) | ||
3528 | { | ||
3529 | idetape_tape_t *tape = drive->driver_data; | ||
3530 | idetape_stage_t *stage; | ||
3531 | struct request *rq; | ||
3532 | int size = 0; | ||
3533 | |||
3534 | idetape_wait_for_pipeline(drive); | ||
3535 | stage = tape->first_stage; | ||
3536 | while (stage != NULL) { | ||
3537 | rq = &stage->rq; | ||
3538 | size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); | ||
3539 | if (rq->errors == IDETAPE_ERROR_FILEMARK) | ||
3540 | size += tape->tape_block_size; | ||
3541 | stage = stage->next; | ||
3542 | } | ||
3543 | size += tape->merge_stage_size; | ||
3544 | return size; | ||
3545 | } | ||
3546 | |||
3547 | /* | ||
3548 | * Rewinds the tape to the Beginning Of the current Partition (BOP). | ||
3549 | * | ||
3550 | * We currently support only one partition. | ||
3551 | */ | ||
3552 | static int idetape_rewind_tape (ide_drive_t *drive) | ||
3553 | { | ||
3554 | int retval; | ||
3555 | idetape_pc_t pc; | ||
3556 | #if IDETAPE_DEBUG_LOG | ||
3557 | idetape_tape_t *tape = drive->driver_data; | ||
3558 | if (tape->debug_level >= 2) | ||
3559 | printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); | ||
3560 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3561 | |||
3562 | idetape_create_rewind_cmd(drive, &pc); | ||
3563 | retval = idetape_queue_pc_tail(drive, &pc); | ||
3564 | if (retval) | ||
3565 | return retval; | ||
3566 | |||
3567 | idetape_create_read_position_cmd(&pc); | ||
3568 | retval = idetape_queue_pc_tail(drive, &pc); | ||
3569 | if (retval) | ||
3570 | return retval; | ||
3571 | return 0; | ||
3572 | } | ||
3573 | |||
3574 | /* | ||
3575 | * Our special ide-tape ioctl's. | ||
3576 | * | ||
3577 | * Currently there aren't any ioctl's. | ||
3578 | * mtio.h compatible commands should be issued to the character device | ||
3579 | * interface. | ||
3580 | */ | ||
3581 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) | ||
3582 | { | ||
3583 | idetape_tape_t *tape = drive->driver_data; | ||
3584 | idetape_config_t config; | ||
3585 | void __user *argp = (void __user *)arg; | ||
3586 | |||
3587 | #if IDETAPE_DEBUG_LOG | ||
3588 | if (tape->debug_level >= 4) | ||
3589 | printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); | ||
3590 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3591 | switch (cmd) { | ||
3592 | case 0x0340: | ||
3593 | if (copy_from_user(&config, argp, sizeof (idetape_config_t))) | ||
3594 | return -EFAULT; | ||
3595 | tape->best_dsc_rw_frequency = config.dsc_rw_frequency; | ||
3596 | tape->max_stages = config.nr_stages; | ||
3597 | break; | ||
3598 | case 0x0350: | ||
3599 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; | ||
3600 | config.nr_stages = tape->max_stages; | ||
3601 | if (copy_to_user(argp, &config, sizeof (idetape_config_t))) | ||
3602 | return -EFAULT; | ||
3603 | break; | ||
3604 | default: | ||
3605 | return -EIO; | ||
3606 | } | ||
3607 | return 0; | ||
3608 | } | ||
3609 | |||
3610 | /* | ||
3611 | * idetape_space_over_filemarks is now a bit more complicated than just | ||
3612 | * passing the command to the tape since we may have crossed some | ||
3613 | * filemarks during our pipelined read-ahead mode. | ||
3614 | * | ||
3615 | * As a minor side effect, the pipeline enables us to support MTFSFM when | ||
3616 | * the filemark is in our internal pipeline even if the tape doesn't | ||
3617 | * support spacing over filemarks in the reverse direction. | ||
3618 | */ | ||
3619 | static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) | ||
3620 | { | ||
3621 | idetape_tape_t *tape = drive->driver_data; | ||
3622 | idetape_pc_t pc; | ||
3623 | unsigned long flags; | ||
3624 | int retval,count=0; | ||
3625 | |||
3626 | if (mt_count == 0) | ||
3627 | return 0; | ||
3628 | if (MTBSF == mt_op || MTBSFM == mt_op) { | ||
3629 | if (!tape->capabilities.sprev) | ||
3630 | return -EIO; | ||
3631 | mt_count = - mt_count; | ||
3632 | } | ||
3633 | |||
3634 | if (tape->chrdev_direction == idetape_direction_read) { | ||
3635 | /* | ||
3636 | * We have a read-ahead buffer. Scan it for crossed | ||
3637 | * filemarks. | ||
3638 | */ | ||
3639 | tape->merge_stage_size = 0; | ||
3640 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) | ||
3641 | ++count; | ||
3642 | while (tape->first_stage != NULL) { | ||
3643 | if (count == mt_count) { | ||
3644 | if (mt_op == MTFSFM) | ||
3645 | set_bit(IDETAPE_FILEMARK, &tape->flags); | ||
3646 | return 0; | ||
3647 | } | ||
3648 | spin_lock_irqsave(&tape->spinlock, flags); | ||
3649 | if (tape->first_stage == tape->active_stage) { | ||
3650 | /* | ||
3651 | * We have reached the active stage in the read pipeline. | ||
3652 | * There is no point in allowing the drive to continue | ||
3653 | * reading any farther, so we stop the pipeline. | ||
3654 | * | ||
3655 | * This section should be moved to a separate subroutine, | ||
3656 | * because a similar function is performed in | ||
3657 | * __idetape_discard_read_pipeline(), for example. | ||
3658 | */ | ||
3659 | tape->next_stage = NULL; | ||
3660 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3661 | idetape_wait_first_stage(drive); | ||
3662 | tape->next_stage = tape->first_stage->next; | ||
3663 | } else | ||
3664 | spin_unlock_irqrestore(&tape->spinlock, flags); | ||
3665 | if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) | ||
3666 | ++count; | ||
3667 | idetape_remove_stage_head(drive); | ||
3668 | } | ||
3669 | idetape_discard_read_pipeline(drive, 0); | ||
3670 | } | ||
3671 | |||
3672 | /* | ||
3673 | * The filemark was not found in our internal pipeline. | ||
3674 | * Now we can issue the space command. | ||
3675 | */ | ||
3676 | switch (mt_op) { | ||
3677 | case MTFSF: | ||
3678 | case MTBSF: | ||
3679 | idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); | ||
3680 | return (idetape_queue_pc_tail(drive, &pc)); | ||
3681 | case MTFSFM: | ||
3682 | case MTBSFM: | ||
3683 | if (!tape->capabilities.sprev) | ||
3684 | return (-EIO); | ||
3685 | retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); | ||
3686 | if (retval) return (retval); | ||
3687 | count = (MTBSFM == mt_op ? 1 : -1); | ||
3688 | return (idetape_space_over_filemarks(drive, MTFSF, count)); | ||
3689 | default: | ||
3690 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); | ||
3691 | return (-EIO); | ||
3692 | } | ||
3693 | } | ||
3694 | |||
3695 | |||
3696 | /* | ||
3697 | * Our character device read / write functions. | ||
3698 | * | ||
3699 | * The tape is optimized to maximize throughput when it is transferring | ||
3700 | * an integral number of the "continuous transfer limit", which is | ||
3701 | * a parameter of the specific tape (26 KB on my particular tape). | ||
3702 | * (32 kB for Onstream) | ||
3703 | * | ||
3704 | * As of version 1.3 of the driver, the character device provides an | ||
3705 | * abstract continuous view of the media - any mix of block sizes (even 1 | ||
3706 | * byte) on the same backup/restore procedure is supported. The driver | ||
3707 | * will internally convert the requests to the recommended transfer unit, | ||
3708 | * so that an unmatch between the user's block size to the recommended | ||
3709 | * size will only result in a (slightly) increased driver overhead, but | ||
3710 | * will no longer hit performance. | ||
3711 | * This is not applicable to Onstream. | ||
3712 | */ | ||
3713 | static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, | ||
3714 | size_t count, loff_t *ppos) | ||
3715 | { | ||
3716 | struct ide_tape_obj *tape = ide_tape_f(file); | ||
3717 | ide_drive_t *drive = tape->drive; | ||
3718 | ssize_t bytes_read,temp, actually_read = 0, rc; | ||
3719 | |||
3720 | #if IDETAPE_DEBUG_LOG | ||
3721 | if (tape->debug_level >= 3) | ||
3722 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); | ||
3723 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3724 | |||
3725 | if (tape->chrdev_direction != idetape_direction_read) { | ||
3726 | if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) | ||
3727 | if (count > tape->tape_block_size && | ||
3728 | (count % tape->tape_block_size) == 0) | ||
3729 | tape->user_bs_factor = count / tape->tape_block_size; | ||
3730 | } | ||
3731 | if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) | ||
3732 | return rc; | ||
3733 | if (count == 0) | ||
3734 | return (0); | ||
3735 | if (tape->merge_stage_size) { | ||
3736 | actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); | ||
3737 | idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read); | ||
3738 | buf += actually_read; | ||
3739 | tape->merge_stage_size -= actually_read; | ||
3740 | count -= actually_read; | ||
3741 | } | ||
3742 | while (count >= tape->stage_size) { | ||
3743 | bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); | ||
3744 | if (bytes_read <= 0) | ||
3745 | goto finish; | ||
3746 | idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read); | ||
3747 | buf += bytes_read; | ||
3748 | count -= bytes_read; | ||
3749 | actually_read += bytes_read; | ||
3750 | } | ||
3751 | if (count) { | ||
3752 | bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); | ||
3753 | if (bytes_read <= 0) | ||
3754 | goto finish; | ||
3755 | temp = min((unsigned long)count, (unsigned long)bytes_read); | ||
3756 | idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp); | ||
3757 | actually_read += temp; | ||
3758 | tape->merge_stage_size = bytes_read-temp; | ||
3759 | } | ||
3760 | finish: | ||
3761 | if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { | ||
3762 | #if IDETAPE_DEBUG_LOG | ||
3763 | if (tape->debug_level >= 2) | ||
3764 | printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); | ||
3765 | #endif | ||
3766 | idetape_space_over_filemarks(drive, MTFSF, 1); | ||
3767 | return 0; | ||
3768 | } | ||
3769 | return actually_read; | ||
3770 | } | ||
3771 | |||
3772 | static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, | ||
3773 | size_t count, loff_t *ppos) | ||
3774 | { | ||
3775 | struct ide_tape_obj *tape = ide_tape_f(file); | ||
3776 | ide_drive_t *drive = tape->drive; | ||
3777 | ssize_t retval, actually_written = 0; | ||
3778 | |||
3779 | /* The drive is write protected. */ | ||
3780 | if (tape->write_prot) | ||
3781 | return -EACCES; | ||
3782 | |||
3783 | #if IDETAPE_DEBUG_LOG | ||
3784 | if (tape->debug_level >= 3) | ||
3785 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " | ||
3786 | "count %Zd\n", count); | ||
3787 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3788 | |||
3789 | /* Initialize write operation */ | ||
3790 | if (tape->chrdev_direction != idetape_direction_write) { | ||
3791 | if (tape->chrdev_direction == idetape_direction_read) | ||
3792 | idetape_discard_read_pipeline(drive, 1); | ||
3793 | #if IDETAPE_DEBUG_BUGS | ||
3794 | if (tape->merge_stage || tape->merge_stage_size) { | ||
3795 | printk(KERN_ERR "ide-tape: merge_stage_size " | ||
3796 | "should be 0 now\n"); | ||
3797 | tape->merge_stage_size = 0; | ||
3798 | } | ||
3799 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3800 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) | ||
3801 | return -ENOMEM; | ||
3802 | tape->chrdev_direction = idetape_direction_write; | ||
3803 | idetape_init_merge_stage(tape); | ||
3804 | |||
3805 | /* | ||
3806 | * Issue a write 0 command to ensure that DSC handshake | ||
3807 | * is switched from completion mode to buffer available | ||
3808 | * mode. | ||
3809 | * No point in issuing this if DSC overlap isn't supported, | ||
3810 | * some drives (Seagate STT3401A) will return an error. | ||
3811 | */ | ||
3812 | if (drive->dsc_overlap) { | ||
3813 | retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); | ||
3814 | if (retval < 0) { | ||
3815 | __idetape_kfree_stage(tape->merge_stage); | ||
3816 | tape->merge_stage = NULL; | ||
3817 | tape->chrdev_direction = idetape_direction_none; | ||
3818 | return retval; | ||
3819 | } | ||
3820 | } | ||
3821 | } | ||
3822 | if (count == 0) | ||
3823 | return (0); | ||
3824 | if (tape->restart_speed_control_req) | ||
3825 | idetape_restart_speed_control(drive); | ||
3826 | if (tape->merge_stage_size) { | ||
3827 | #if IDETAPE_DEBUG_BUGS | ||
3828 | if (tape->merge_stage_size >= tape->stage_size) { | ||
3829 | printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); | ||
3830 | tape->merge_stage_size = 0; | ||
3831 | } | ||
3832 | #endif /* IDETAPE_DEBUG_BUGS */ | ||
3833 | actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); | ||
3834 | idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written); | ||
3835 | buf += actually_written; | ||
3836 | tape->merge_stage_size += actually_written; | ||
3837 | count -= actually_written; | ||
3838 | |||
3839 | if (tape->merge_stage_size == tape->stage_size) { | ||
3840 | tape->merge_stage_size = 0; | ||
3841 | retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); | ||
3842 | if (retval <= 0) | ||
3843 | return (retval); | ||
3844 | } | ||
3845 | } | ||
3846 | while (count >= tape->stage_size) { | ||
3847 | idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size); | ||
3848 | buf += tape->stage_size; | ||
3849 | count -= tape->stage_size; | ||
3850 | retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); | ||
3851 | actually_written += tape->stage_size; | ||
3852 | if (retval <= 0) | ||
3853 | return (retval); | ||
3854 | } | ||
3855 | if (count) { | ||
3856 | actually_written += count; | ||
3857 | idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count); | ||
3858 | tape->merge_stage_size += count; | ||
3859 | } | ||
3860 | return (actually_written); | ||
3861 | } | ||
3862 | |||
3863 | static int idetape_write_filemark (ide_drive_t *drive) | ||
3864 | { | ||
3865 | idetape_pc_t pc; | ||
3866 | |||
3867 | /* Write a filemark */ | ||
3868 | idetape_create_write_filemark_cmd(drive, &pc, 1); | ||
3869 | if (idetape_queue_pc_tail(drive, &pc)) { | ||
3870 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | ||
3871 | return -EIO; | ||
3872 | } | ||
3873 | return 0; | ||
3874 | } | ||
3875 | |||
3876 | /* | ||
3877 | * idetape_mtioctop is called from idetape_chrdev_ioctl when | ||
3878 | * the general mtio MTIOCTOP ioctl is requested. | ||
3879 | * | ||
3880 | * We currently support the following mtio.h operations: | ||
3881 | * | ||
3882 | * MTFSF - Space over mt_count filemarks in the positive direction. | ||
3883 | * The tape is positioned after the last spaced filemark. | ||
3884 | * | ||
3885 | * MTFSFM - Same as MTFSF, but the tape is positioned before the | ||
3886 | * last filemark. | ||
3887 | * | ||
3888 | * MTBSF - Steps background over mt_count filemarks, tape is | ||
3889 | * positioned before the last filemark. | ||
3890 | * | ||
3891 | * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. | ||
3892 | * | ||
3893 | * Note: | ||
3894 | * | ||
3895 | * MTBSF and MTBSFM are not supported when the tape doesn't | ||
3896 | * support spacing over filemarks in the reverse direction. | ||
3897 | * In this case, MTFSFM is also usually not supported (it is | ||
3898 | * supported in the rare case in which we crossed the filemark | ||
3899 | * during our read-ahead pipelined operation mode). | ||
3900 | * | ||
3901 | * MTWEOF - Writes mt_count filemarks. Tape is positioned after | ||
3902 | * the last written filemark. | ||
3903 | * | ||
3904 | * MTREW - Rewinds tape. | ||
3905 | * | ||
3906 | * MTLOAD - Loads the tape. | ||
3907 | * | ||
3908 | * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and | ||
3909 | * MTUNLOAD prevents further access until the media is replaced. | ||
3910 | * | ||
3911 | * MTNOP - Flushes tape buffers. | ||
3912 | * | ||
3913 | * MTRETEN - Retension media. This typically consists of one end | ||
3914 | * to end pass on the media. | ||
3915 | * | ||
3916 | * MTEOM - Moves to the end of recorded data. | ||
3917 | * | ||
3918 | * MTERASE - Erases tape. | ||
3919 | * | ||
3920 | * MTSETBLK - Sets the user block size to mt_count bytes. If | ||
3921 | * mt_count is 0, we will attempt to autodetect | ||
3922 | * the block size. | ||
3923 | * | ||
3924 | * MTSEEK - Positions the tape in a specific block number, where | ||
3925 | * each block is assumed to contain which user_block_size | ||
3926 | * bytes. | ||
3927 | * | ||
3928 | * MTSETPART - Switches to another tape partition. | ||
3929 | * | ||
3930 | * MTLOCK - Locks the tape door. | ||
3931 | * | ||
3932 | * MTUNLOCK - Unlocks the tape door. | ||
3933 | * | ||
3934 | * The following commands are currently not supported: | ||
3935 | * | ||
3936 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, | ||
3937 | * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. | ||
3938 | */ | ||
3939 | static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) | ||
3940 | { | ||
3941 | idetape_tape_t *tape = drive->driver_data; | ||
3942 | idetape_pc_t pc; | ||
3943 | int i,retval; | ||
3944 | |||
3945 | #if IDETAPE_DEBUG_LOG | ||
3946 | if (tape->debug_level >= 1) | ||
3947 | printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " | ||
3948 | "mt_op=%d, mt_count=%d\n", mt_op, mt_count); | ||
3949 | #endif /* IDETAPE_DEBUG_LOG */ | ||
3950 | /* | ||
3951 | * Commands which need our pipelined read-ahead stages. | ||
3952 | */ | ||
3953 | switch (mt_op) { | ||
3954 | case MTFSF: | ||
3955 | case MTFSFM: | ||
3956 | case MTBSF: | ||
3957 | case MTBSFM: | ||
3958 | if (!mt_count) | ||
3959 | return (0); | ||
3960 | return (idetape_space_over_filemarks(drive,mt_op,mt_count)); | ||
3961 | default: | ||
3962 | break; | ||
3963 | } | ||
3964 | switch (mt_op) { | ||
3965 | case MTWEOF: | ||
3966 | if (tape->write_prot) | ||
3967 | return -EACCES; | ||
3968 | idetape_discard_read_pipeline(drive, 1); | ||
3969 | for (i = 0; i < mt_count; i++) { | ||
3970 | retval = idetape_write_filemark(drive); | ||
3971 | if (retval) | ||
3972 | return retval; | ||
3973 | } | ||
3974 | return (0); | ||
3975 | case MTREW: | ||
3976 | idetape_discard_read_pipeline(drive, 0); | ||
3977 | if (idetape_rewind_tape(drive)) | ||
3978 | return -EIO; | ||
3979 | return 0; | ||
3980 | case MTLOAD: | ||
3981 | idetape_discard_read_pipeline(drive, 0); | ||
3982 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); | ||
3983 | return (idetape_queue_pc_tail(drive, &pc)); | ||
3984 | case MTUNLOAD: | ||
3985 | case MTOFFL: | ||
3986 | /* | ||
3987 | * If door is locked, attempt to unlock before | ||
3988 | * attempting to eject. | ||
3989 | */ | ||
3990 | if (tape->door_locked) { | ||
3991 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | ||
3992 | if (!idetape_queue_pc_tail(drive, &pc)) | ||
3993 | tape->door_locked = DOOR_UNLOCKED; | ||
3994 | } | ||
3995 | idetape_discard_read_pipeline(drive, 0); | ||
3996 | idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); | ||
3997 | retval = idetape_queue_pc_tail(drive, &pc); | ||
3998 | if (!retval) | ||
3999 | clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); | ||
4000 | return retval; | ||
4001 | case MTNOP: | ||
4002 | idetape_discard_read_pipeline(drive, 0); | ||
4003 | return (idetape_flush_tape_buffers(drive)); | ||
4004 | case MTRETEN: | ||
4005 | idetape_discard_read_pipeline(drive, 0); | ||
4006 | idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | ||
4007 | return (idetape_queue_pc_tail(drive, &pc)); | ||
4008 | case MTEOM: | ||
4009 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | ||
4010 | return (idetape_queue_pc_tail(drive, &pc)); | ||
4011 | case MTERASE: | ||
4012 | (void) idetape_rewind_tape(drive); | ||
4013 | idetape_create_erase_cmd(&pc); | ||
4014 | return (idetape_queue_pc_tail(drive, &pc)); | ||
4015 | case MTSETBLK: | ||
4016 | if (mt_count) { | ||
4017 | if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) | ||
4018 | return -EIO; | ||
4019 | tape->user_bs_factor = mt_count / tape->tape_block_size; | ||
4020 | clear_bit(IDETAPE_DETECT_BS, &tape->flags); | ||
4021 | } else | ||
4022 | set_bit(IDETAPE_DETECT_BS, &tape->flags); | ||
4023 | return 0; | ||
4024 | case MTSEEK: | ||
4025 | idetape_discard_read_pipeline(drive, 0); | ||
4026 | return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); | ||
4027 | case MTSETPART: | ||
4028 | idetape_discard_read_pipeline(drive, 0); | ||
4029 | return (idetape_position_tape(drive, 0, mt_count, 0)); | ||
4030 | case MTFSR: | ||
4031 | case MTBSR: | ||
4032 | case MTLOCK: | ||
4033 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | ||
4034 | return 0; | ||
4035 | retval = idetape_queue_pc_tail(drive, &pc); | ||
4036 | if (retval) return retval; | ||
4037 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; | ||
4038 | return 0; | ||
4039 | case MTUNLOCK: | ||
4040 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | ||
4041 | return 0; | ||
4042 | retval = idetape_queue_pc_tail(drive, &pc); | ||
4043 | if (retval) return retval; | ||
4044 | tape->door_locked = DOOR_UNLOCKED; | ||
4045 | return 0; | ||
4046 | default: | ||
4047 | printk(KERN_ERR "ide-tape: MTIO operation %d not " | ||
4048 | "supported\n", mt_op); | ||
4049 | return (-EIO); | ||
4050 | } | ||
4051 | } | ||
4052 | |||
4053 | /* | ||
4054 | * Our character device ioctls. | ||
4055 | * | ||
4056 | * General mtio.h magnetic io commands are supported here, and not in | ||
4057 | * the corresponding block interface. | ||
4058 | * | ||
4059 | * The following ioctls are supported: | ||
4060 | * | ||
4061 | * MTIOCTOP - Refer to idetape_mtioctop for detailed description. | ||
4062 | * | ||
4063 | * MTIOCGET - The mt_dsreg field in the returned mtget structure | ||
4064 | * will be set to (user block size in bytes << | ||
4065 | * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. | ||
4066 | * | ||
4067 | * The mt_blkno is set to the current user block number. | ||
4068 | * The other mtget fields are not supported. | ||
4069 | * | ||
4070 | * MTIOCPOS - The current tape "block position" is returned. We | ||
4071 | * assume that each block contains user_block_size | ||
4072 | * bytes. | ||
4073 | * | ||
4074 | * Our own ide-tape ioctls are supported on both interfaces. | ||
4075 | */ | ||
4076 | static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | ||
4077 | { | ||
4078 | struct ide_tape_obj *tape = ide_tape_f(file); | ||
4079 | ide_drive_t *drive = tape->drive; | ||
4080 | struct mtop mtop; | ||
4081 | struct mtget mtget; | ||
4082 | struct mtpos mtpos; | ||
4083 | int block_offset = 0, position = tape->first_frame_position; | ||
4084 | void __user *argp = (void __user *)arg; | ||
4085 | |||
4086 | #if IDETAPE_DEBUG_LOG | ||
4087 | if (tape->debug_level >= 3) | ||
4088 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " | ||
4089 | "cmd=%u\n", cmd); | ||
4090 | #endif /* IDETAPE_DEBUG_LOG */ | ||
4091 | |||
4092 | tape->restart_speed_control_req = 1; | ||
4093 | if (tape->chrdev_direction == idetape_direction_write) { | ||
4094 | idetape_empty_write_pipeline(drive); | ||
4095 | idetape_flush_tape_buffers(drive); | ||
4096 | } | ||
4097 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | ||
4098 | block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); | ||
4099 | if ((position = idetape_read_position(drive)) < 0) | ||
4100 | return -EIO; | ||
4101 | } | ||
4102 | switch (cmd) { | ||
4103 | case MTIOCTOP: | ||
4104 | if (copy_from_user(&mtop, argp, sizeof (struct mtop))) | ||
4105 | return -EFAULT; | ||
4106 | return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); | ||
4107 | case MTIOCGET: | ||
4108 | memset(&mtget, 0, sizeof (struct mtget)); | ||
4109 | mtget.mt_type = MT_ISSCSI2; | ||
4110 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | ||
4111 | mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | ||
4112 | if (tape->drv_write_prot) { | ||
4113 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | ||
4114 | } | ||
4115 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | ||
4116 | return -EFAULT; | ||
4117 | return 0; | ||
4118 | case MTIOCPOS: | ||
4119 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | ||
4120 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | ||
4121 | return -EFAULT; | ||
4122 | return 0; | ||
4123 | default: | ||
4124 | if (tape->chrdev_direction == idetape_direction_read) | ||
4125 | idetape_discard_read_pipeline(drive, 1); | ||
4126 | return idetape_blkdev_ioctl(drive, cmd, arg); | ||
4127 | } | ||
4128 | } | ||
4129 | |||
4130 | static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); | ||
4131 | |||
4132 | /* | ||
4133 | * Our character device open function. | ||
4134 | */ | ||
4135 | static int idetape_chrdev_open (struct inode *inode, struct file *filp) | ||
4136 | { | ||
4137 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | ||
4138 | ide_drive_t *drive; | ||
4139 | idetape_tape_t *tape; | ||
4140 | idetape_pc_t pc; | ||
4141 | int retval; | ||
4142 | |||
4143 | /* | ||
4144 | * We really want to do nonseekable_open(inode, filp); here, but some | ||
4145 | * versions of tar incorrectly call lseek on tapes and bail out if that | ||
4146 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | ||
4147 | */ | ||
4148 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | ||
4149 | |||
4150 | #if IDETAPE_DEBUG_LOG | ||
4151 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); | ||
4152 | #endif /* IDETAPE_DEBUG_LOG */ | ||
4153 | |||
4154 | if (i >= MAX_HWIFS * MAX_DRIVES) | ||
4155 | return -ENXIO; | ||
4156 | |||
4157 | if (!(tape = ide_tape_chrdev_get(i))) | ||
4158 | return -ENXIO; | ||
4159 | |||
4160 | drive = tape->drive; | ||
4161 | |||
4162 | filp->private_data = tape; | ||
4163 | |||
4164 | if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { | ||
4165 | retval = -EBUSY; | ||
4166 | goto out_put_tape; | ||
4167 | } | ||
4168 | |||
4169 | retval = idetape_wait_ready(drive, 60 * HZ); | ||
4170 | if (retval) { | ||
4171 | clear_bit(IDETAPE_BUSY, &tape->flags); | ||
4172 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); | ||
4173 | goto out_put_tape; | ||
4174 | } | ||
4175 | |||
4176 | idetape_read_position(drive); | ||
4177 | if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) | ||
4178 | (void)idetape_rewind_tape(drive); | ||
4179 | |||
4180 | if (tape->chrdev_direction != idetape_direction_read) | ||
4181 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | ||
4182 | |||
4183 | /* Read block size and write protect status from drive. */ | ||
4184 | idetape_get_blocksize_from_block_descriptor(drive); | ||
4185 | |||
4186 | /* Set write protect flag if device is opened as read-only. */ | ||
4187 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | ||
4188 | tape->write_prot = 1; | ||
4189 | else | ||
4190 | tape->write_prot = tape->drv_write_prot; | ||
4191 | |||
4192 | /* Make sure drive isn't write protected if user wants to write. */ | ||
4193 | if (tape->write_prot) { | ||
4194 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | ||
4195 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | ||
4196 | clear_bit(IDETAPE_BUSY, &tape->flags); | ||
4197 | retval = -EROFS; | ||
4198 | goto out_put_tape; | ||
4199 | } | ||
4200 | } | ||
4201 | |||
4202 | /* | ||
4203 | * Lock the tape drive door so user can't eject. | ||
4204 | */ | ||
4205 | if (tape->chrdev_direction == idetape_direction_none) { | ||
4206 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { | ||
4207 | if (!idetape_queue_pc_tail(drive, &pc)) { | ||
4208 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | ||
4209 | tape->door_locked = DOOR_LOCKED; | ||
4210 | } | ||
4211 | } | ||
4212 | } | ||
4213 | idetape_restart_speed_control(drive); | ||
4214 | tape->restart_speed_control_req = 0; | ||
4215 | return 0; | ||
4216 | |||
4217 | out_put_tape: | ||
4218 | ide_tape_put(tape); | ||
4219 | return retval; | ||
4220 | } | ||
4221 | |||
4222 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor) | ||
4223 | { | ||
4224 | idetape_tape_t *tape = drive->driver_data; | ||
4225 | |||
4226 | idetape_empty_write_pipeline(drive); | ||
4227 | tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); | ||
4228 | if (tape->merge_stage != NULL) { | ||
4229 | idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); | ||
4230 | __idetape_kfree_stage(tape->merge_stage); | ||
4231 | tape->merge_stage = NULL; | ||
4232 | } | ||
4233 | idetape_write_filemark(drive); | ||
4234 | idetape_flush_tape_buffers(drive); | ||
4235 | idetape_flush_tape_buffers(drive); | ||
4236 | } | ||
4237 | |||
4238 | /* | ||
4239 | * Our character device release function. | ||
4240 | */ | ||
4241 | static int idetape_chrdev_release (struct inode *inode, struct file *filp) | ||
4242 | { | ||
4243 | struct ide_tape_obj *tape = ide_tape_f(filp); | ||
4244 | ide_drive_t *drive = tape->drive; | ||
4245 | idetape_pc_t pc; | ||
4246 | unsigned int minor = iminor(inode); | ||
4247 | |||
4248 | lock_kernel(); | ||
4249 | tape = drive->driver_data; | ||
4250 | #if IDETAPE_DEBUG_LOG | ||
4251 | if (tape->debug_level >= 3) | ||
4252 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); | ||
4253 | #endif /* IDETAPE_DEBUG_LOG */ | ||
4254 | |||
4255 | if (tape->chrdev_direction == idetape_direction_write) | ||
4256 | idetape_write_release(drive, minor); | ||
4257 | if (tape->chrdev_direction == idetape_direction_read) { | ||
4258 | if (minor < 128) | ||
4259 | idetape_discard_read_pipeline(drive, 1); | ||
4260 | else | ||
4261 | idetape_wait_for_pipeline(drive); | ||
4262 | } | ||
4263 | if (tape->cache_stage != NULL) { | ||
4264 | __idetape_kfree_stage(tape->cache_stage); | ||
4265 | tape->cache_stage = NULL; | ||
4266 | } | ||
4267 | if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) | ||
4268 | (void) idetape_rewind_tape(drive); | ||
4269 | if (tape->chrdev_direction == idetape_direction_none) { | ||
4270 | if (tape->door_locked == DOOR_LOCKED) { | ||
4271 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | ||
4272 | if (!idetape_queue_pc_tail(drive, &pc)) | ||
4273 | tape->door_locked = DOOR_UNLOCKED; | ||
4274 | } | ||
4275 | } | ||
4276 | } | ||
4277 | clear_bit(IDETAPE_BUSY, &tape->flags); | ||
4278 | ide_tape_put(tape); | ||
4279 | unlock_kernel(); | ||
4280 | return 0; | ||
4281 | } | ||
4282 | |||
4283 | /* | ||
4284 | * idetape_identify_device is called to check the contents of the | ||
4285 | * ATAPI IDENTIFY command results. We return: | ||
4286 | * | ||
4287 | * 1 If the tape can be supported by us, based on the information | ||
4288 | * we have so far. | ||
4289 | * | ||
4290 | * 0 If this tape driver is not currently supported by us. | ||
4291 | */ | ||
4292 | static int idetape_identify_device (ide_drive_t *drive) | ||
4293 | { | ||
4294 | struct idetape_id_gcw gcw; | ||
4295 | struct hd_driveid *id = drive->id; | ||
4296 | #if IDETAPE_DEBUG_INFO | ||
4297 | unsigned short mask,i; | ||
4298 | #endif /* IDETAPE_DEBUG_INFO */ | ||
4299 | |||
4300 | if (drive->id_read == 0) | ||
4301 | return 1; | ||
4302 | |||
4303 | *((unsigned short *) &gcw) = id->config; | ||
4304 | |||
4305 | #if IDETAPE_DEBUG_INFO | ||
4306 | printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); | ||
4307 | printk(KERN_INFO "ide-tape: Protocol Type: "); | ||
4308 | switch (gcw.protocol) { | ||
4309 | case 0: case 1: printk("ATA\n");break; | ||
4310 | case 2: printk("ATAPI\n");break; | ||
4311 | case 3: printk("Reserved (Unknown to ide-tape)\n");break; | ||
4312 | } | ||
4313 | printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); | ||
4314 | switch (gcw.device_type) { | ||
4315 | case 0: printk("Direct-access Device\n");break; | ||
4316 | case 1: printk("Streaming Tape Device\n");break; | ||
4317 | case 2: case 3: case 4: printk("Reserved\n");break; | ||
4318 | case 5: printk("CD-ROM Device\n");break; | ||
4319 | case 6: printk("Reserved\n"); | ||
4320 | case 7: printk("Optical memory Device\n");break; | ||
4321 | case 0x1f: printk("Unknown or no Device type\n");break; | ||
4322 | default: printk("Reserved\n"); | ||
4323 | } | ||
4324 | printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); | ||
4325 | printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); | ||
4326 | switch (gcw.drq_type) { | ||
4327 | case 0: printk("Microprocessor DRQ\n");break; | ||
4328 | case 1: printk("Interrupt DRQ\n");break; | ||
4329 | case 2: printk("Accelerated DRQ\n");break; | ||
4330 | case 3: printk("Reserved\n");break; | ||
4331 | } | ||
4332 | printk(KERN_INFO "ide-tape: Command Packet Size: "); | ||
4333 | switch (gcw.packet_size) { | ||
4334 | case 0: printk("12 bytes\n");break; | ||
4335 | case 1: printk("16 bytes\n");break; | ||
4336 | default: printk("Reserved\n");break; | ||
4337 | } | ||
4338 | printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model); | ||
4339 | printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); | ||
4340 | printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); | ||
4341 | printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); | ||
4342 | printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); | ||
4343 | printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); | ||
4344 | printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); | ||
4345 | printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); | ||
4346 | printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); | ||
4347 | printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); | ||
4348 | printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); | ||
4349 | printk(KERN_INFO "ide-tape: Single Word DMA supported modes: "); | ||
4350 | for (i=0,mask=1;i<8;i++,mask=mask << 1) { | ||
4351 | if (id->dma_1word & mask) | ||
4352 | printk("%d ",i); | ||
4353 | if (id->dma_1word & (mask << 8)) | ||
4354 | printk("(active) "); | ||
4355 | } | ||
4356 | printk("\n"); | ||
4357 | printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: "); | ||
4358 | for (i=0,mask=1;i<8;i++,mask=mask << 1) { | ||
4359 | if (id->dma_mword & mask) | ||
4360 | printk("%d ",i); | ||
4361 | if (id->dma_mword & (mask << 8)) | ||
4362 | printk("(active) "); | ||
4363 | } | ||
4364 | printk("\n"); | ||
4365 | if (id->field_valid & 0x0002) { | ||
4366 | printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n", | ||
4367 | id->eide_pio_modes & 1 ? "Mode 3":"None"); | ||
4368 | printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); | ||
4369 | if (id->eide_dma_min == 0) | ||
4370 | printk("Not supported\n"); | ||
4371 | else | ||
4372 | printk("%d ns\n",id->eide_dma_min); | ||
4373 | |||
4374 | printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); | ||
4375 | if (id->eide_dma_time == 0) | ||
4376 | printk("Not supported\n"); | ||
4377 | else | ||
4378 | printk("%d ns\n",id->eide_dma_time); | ||
4379 | |||
4380 | printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); | ||
4381 | if (id->eide_pio == 0) | ||
4382 | printk("Not supported\n"); | ||
4383 | else | ||
4384 | printk("%d ns\n",id->eide_pio); | ||
4385 | |||
4386 | printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); | ||
4387 | if (id->eide_pio_iordy == 0) | ||
4388 | printk("Not supported\n"); | ||
4389 | else | ||
4390 | printk("%d ns\n",id->eide_pio_iordy); | ||
4391 | |||
4392 | } else | ||
4393 | printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); | ||
4394 | #endif /* IDETAPE_DEBUG_INFO */ | ||
4395 | |||
4396 | /* Check that we can support this device */ | ||
4397 | |||
4398 | if (gcw.protocol !=2 ) | ||
4399 | printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); | ||
4400 | else if (gcw.device_type != 1) | ||
4401 | printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); | ||
4402 | else if (!gcw.removable) | ||
4403 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); | ||
4404 | else if (gcw.packet_size != 0) { | ||
4405 | printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); | ||
4406 | if (gcw.packet_size == 1) | ||
4407 | printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); | ||
4408 | } else | ||
4409 | return 1; | ||
4410 | return 0; | ||
4411 | } | ||
4412 | |||
4413 | /* | ||
4414 | * Use INQUIRY to get the firmware revision | ||
4415 | */ | ||
4416 | static void idetape_get_inquiry_results (ide_drive_t *drive) | ||
4417 | { | ||
4418 | char *r; | ||
4419 | idetape_tape_t *tape = drive->driver_data; | ||
4420 | idetape_pc_t pc; | ||
4421 | idetape_inquiry_result_t *inquiry; | ||
4422 | |||
4423 | idetape_create_inquiry_cmd(&pc); | ||
4424 | if (idetape_queue_pc_tail(drive, &pc)) { | ||
4425 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); | ||
4426 | return; | ||
4427 | } | ||
4428 | inquiry = (idetape_inquiry_result_t *) pc.buffer; | ||
4429 | memcpy(tape->vendor_id, inquiry->vendor_id, 8); | ||
4430 | memcpy(tape->product_id, inquiry->product_id, 16); | ||
4431 | memcpy(tape->firmware_revision, inquiry->revision_level, 4); | ||
4432 | ide_fixstring(tape->vendor_id, 10, 0); | ||
4433 | ide_fixstring(tape->product_id, 18, 0); | ||
4434 | ide_fixstring(tape->firmware_revision, 6, 0); | ||
4435 | r = tape->firmware_revision; | ||
4436 | if (*(r + 1) == '.') | ||
4437 | tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; | ||
4438 | 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); | ||
4439 | } | ||
4440 | |||
4441 | /* | ||
4442 | * idetape_get_mode_sense_results asks the tape about its various | ||
4443 | * parameters. In particular, we will adjust our data transfer buffer | ||
4444 | * size to the recommended value as returned by the tape. | ||
4445 | */ | ||
4446 | static void idetape_get_mode_sense_results (ide_drive_t *drive) | ||
4447 | { | ||
4448 | idetape_tape_t *tape = drive->driver_data; | ||
4449 | idetape_pc_t pc; | ||
4450 | idetape_mode_parameter_header_t *header; | ||
4451 | idetape_capabilities_page_t *capabilities; | ||
4452 | |||
4453 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); | ||
4454 | if (idetape_queue_pc_tail(drive, &pc)) { | ||
4455 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); | ||
4456 | tape->tape_block_size = 512; | ||
4457 | tape->capabilities.ctl = 52; | ||
4458 | tape->capabilities.speed = 450; | ||
4459 | tape->capabilities.buffer_size = 6 * 52; | ||
4460 | return; | ||
4461 | } | ||
4462 | header = (idetape_mode_parameter_header_t *) pc.buffer; | ||
4463 | capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); | ||
4464 | |||
4465 | capabilities->max_speed = ntohs(capabilities->max_speed); | ||
4466 | capabilities->ctl = ntohs(capabilities->ctl); | ||
4467 | capabilities->speed = ntohs(capabilities->speed); | ||
4468 | capabilities->buffer_size = ntohs(capabilities->buffer_size); | ||
4469 | |||
4470 | if (!capabilities->speed) { | ||
4471 | printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); | ||
4472 | capabilities->speed = 650; | ||
4473 | } | ||
4474 | if (!capabilities->max_speed) { | ||
4475 | printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); | ||
4476 | capabilities->max_speed = 650; | ||
4477 | } | ||
4478 | |||
4479 | tape->capabilities = *capabilities; /* Save us a copy */ | ||
4480 | if (capabilities->blk512) | ||
4481 | tape->tape_block_size = 512; | ||
4482 | else if (capabilities->blk1024) | ||
4483 | tape->tape_block_size = 1024; | ||
4484 | |||
4485 | #if IDETAPE_DEBUG_INFO | ||
4486 | printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); | ||
4487 | printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); | ||
4488 | printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); | ||
4489 | printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); | ||
4490 | printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); | ||
4491 | printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); | ||
4492 | |||
4493 | printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); | ||
4494 | printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); | ||
4495 | printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); | ||
4496 | printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); | ||
4497 | printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); | ||
4498 | printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); | ||
4499 | printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); | ||
4500 | printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); | ||
4501 | printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); | ||
4502 | printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); | ||
4503 | printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); | ||
4504 | printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); | ||
4505 | printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); | ||
4506 | printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); | ||
4507 | printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); | ||
4508 | printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); | ||
4509 | printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); | ||
4510 | printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); | ||
4511 | printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); | ||
4512 | printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); | ||
4513 | #endif /* IDETAPE_DEBUG_INFO */ | ||
4514 | } | ||
4515 | |||
4516 | /* | ||
4517 | * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor | ||
4518 | * and if it succeeds sets the tape block size with the reported value | ||
4519 | */ | ||
4520 | static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) | ||
4521 | { | ||
4522 | |||
4523 | idetape_tape_t *tape = drive->driver_data; | ||
4524 | idetape_pc_t pc; | ||
4525 | idetape_mode_parameter_header_t *header; | ||
4526 | idetape_parameter_block_descriptor_t *block_descrp; | ||
4527 | |||
4528 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | ||
4529 | if (idetape_queue_pc_tail(drive, &pc)) { | ||
4530 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | ||
4531 | if (tape->tape_block_size == 0) { | ||
4532 | printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); | ||
4533 | tape->tape_block_size = 32768; | ||
4534 | } | ||
4535 | return; | ||
4536 | } | ||
4537 | header = (idetape_mode_parameter_header_t *) pc.buffer; | ||
4538 | block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); | ||
4539 | tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; | ||
4540 | tape->drv_write_prot = (header->dsp & 0x80) >> 7; | ||
4541 | |||
4542 | #if IDETAPE_DEBUG_INFO | ||
4543 | printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); | ||
4544 | #endif /* IDETAPE_DEBUG_INFO */ | ||
4545 | } | ||
4546 | static void idetape_add_settings (ide_drive_t *drive) | ||
4547 | { | ||
4548 | idetape_tape_t *tape = drive->driver_data; | ||
4549 | |||
4550 | /* | ||
4551 | * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function | ||
4552 | */ | ||
4553 | ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); | ||
4554 | ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); | ||
4555 | ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); | ||
4556 | ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); | ||
4557 | ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); | ||
4558 | ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); | ||
4559 | ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); | ||
4560 | ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); | ||
4561 | ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); | ||
4562 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); | ||
4563 | ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); | ||
4564 | ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL); | ||
4565 | ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); | ||
4566 | ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); | ||
4567 | } | ||
4568 | |||
4569 | /* | ||
4570 | * ide_setup is called to: | ||
4571 | * | ||
4572 | * 1. Initialize our various state variables. | ||
4573 | * 2. Ask the tape for its capabilities. | ||
4574 | * 3. Allocate a buffer which will be used for data | ||
4575 | * transfer. The buffer size is chosen based on | ||
4576 | * the recommendation which we received in step (2). | ||
4577 | * | ||
4578 | * Note that at this point ide.c already assigned us an irq, so that | ||
4579 | * we can queue requests here and wait for their completion. | ||
4580 | */ | ||
4581 | static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) | ||
4582 | { | ||
4583 | unsigned long t1, tmid, tn, t; | ||
4584 | int speed; | ||
4585 | struct idetape_id_gcw gcw; | ||
4586 | int stage_size; | ||
4587 | struct sysinfo si; | ||
4588 | |||
4589 | spin_lock_init(&tape->spinlock); | ||
4590 | drive->dsc_overlap = 1; | ||
4591 | #ifdef CONFIG_BLK_DEV_IDEPCI | ||
4592 | if (HWIF(drive)->pci_dev != NULL) { | ||
4593 | /* | ||
4594 | * These two ide-pci host adapters appear to need DSC overlap disabled. | ||
4595 | * This probably needs further analysis. | ||
4596 | */ | ||
4597 | if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || | ||
4598 | (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { | ||
4599 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); | ||
4600 | drive->dsc_overlap = 0; | ||
4601 | } | ||
4602 | } | ||
4603 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | ||
4604 | /* Seagate Travan drives do not support DSC overlap. */ | ||
4605 | if (strstr(drive->id->model, "Seagate STT3401")) | ||
4606 | drive->dsc_overlap = 0; | ||
4607 | tape->minor = minor; | ||
4608 | tape->name[0] = 'h'; | ||
4609 | tape->name[1] = 't'; | ||
4610 | tape->name[2] = '0' + minor; | ||
4611 | tape->chrdev_direction = idetape_direction_none; | ||
4612 | tape->pc = tape->pc_stack; | ||
4613 | tape->max_insert_speed = 10000; | ||
4614 | tape->speed_control = 1; | ||
4615 | *((unsigned short *) &gcw) = drive->id->config; | ||
4616 | if (gcw.drq_type == 1) | ||
4617 | set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); | ||
4618 | |||
4619 | tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; | ||
4620 | |||
4621 | idetape_get_inquiry_results(drive); | ||
4622 | idetape_get_mode_sense_results(drive); | ||
4623 | idetape_get_blocksize_from_block_descriptor(drive); | ||
4624 | tape->user_bs_factor = 1; | ||
4625 | tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; | ||
4626 | while (tape->stage_size > 0xffff) { | ||
4627 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); | ||
4628 | tape->capabilities.ctl /= 2; | ||
4629 | tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; | ||
4630 | } | ||
4631 | stage_size = tape->stage_size; | ||
4632 | tape->pages_per_stage = stage_size / PAGE_SIZE; | ||
4633 | if (stage_size % PAGE_SIZE) { | ||
4634 | tape->pages_per_stage++; | ||
4635 | tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; | ||
4636 | } | ||
4637 | |||
4638 | /* | ||
4639 | * Select the "best" DSC read/write polling frequency | ||
4640 | * and pipeline size. | ||
4641 | */ | ||
4642 | speed = max(tape->capabilities.speed, tape->capabilities.max_speed); | ||
4643 | |||
4644 | tape->max_stages = speed * 1000 * 10 / tape->stage_size; | ||
4645 | |||
4646 | /* | ||
4647 | * Limit memory use for pipeline to 10% of physical memory | ||
4648 | */ | ||
4649 | si_meminfo(&si); | ||
4650 | if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) | ||
4651 | tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); | ||
4652 | tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); | ||
4653 | tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); | ||
4654 | tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); | ||
4655 | if (tape->max_stages == 0) | ||
4656 | tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; | ||
4657 | |||
4658 | t1 = (tape->stage_size * HZ) / (speed * 1000); | ||
4659 | tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); | ||
4660 | tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); | ||
4661 | |||
4662 | if (tape->max_stages) | ||
4663 | t = tn; | ||
4664 | else | ||
4665 | t = t1; | ||
4666 | |||
4667 | /* | ||
4668 | * Ensure that the number we got makes sense; limit | ||
4669 | * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | ||
4670 | */ | ||
4671 | tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); | ||
4672 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " | ||
4673 | "%dkB pipeline, %lums tDSC%s\n", | ||
4674 | drive->name, tape->name, tape->capabilities.speed, | ||
4675 | (tape->capabilities.buffer_size * 512) / tape->stage_size, | ||
4676 | tape->stage_size / 1024, | ||
4677 | tape->max_stages * tape->stage_size / 1024, | ||
4678 | tape->best_dsc_rw_frequency * 1000 / HZ, | ||
4679 | drive->using_dma ? ", DMA":""); | ||
4680 | |||
4681 | idetape_add_settings(drive); | ||
4682 | } | ||
4683 | |||
4684 | static int idetape_cleanup (ide_drive_t *drive) | ||
4685 | { | ||
4686 | idetape_tape_t *tape = drive->driver_data; | ||
4687 | unsigned long flags; | ||
4688 | |||
4689 | spin_lock_irqsave(&ide_lock, flags); | ||
4690 | if (test_bit(IDETAPE_BUSY, &tape->flags) || drive->usage || | ||
4691 | tape->first_stage != NULL || tape->merge_stage_size) { | ||
4692 | spin_unlock_irqrestore(&ide_lock, flags); | ||
4693 | return 1; | ||
4694 | } | ||
4695 | |||
4696 | spin_unlock_irqrestore(&ide_lock, flags); | ||
4697 | DRIVER(drive)->busy = 0; | ||
4698 | (void) ide_unregister_subdriver(drive); | ||
4699 | |||
4700 | ide_unregister_region(tape->disk); | ||
4701 | |||
4702 | ide_tape_put(tape); | ||
4703 | |||
4704 | return 0; | ||
4705 | } | ||
4706 | |||
4707 | static void ide_tape_release(struct kref *kref) | ||
4708 | { | ||
4709 | struct ide_tape_obj *tape = to_ide_tape(kref); | ||
4710 | ide_drive_t *drive = tape->drive; | ||
4711 | struct gendisk *g = tape->disk; | ||
4712 | |||
4713 | drive->dsc_overlap = 0; | ||
4714 | drive->driver_data = NULL; | ||
4715 | devfs_remove("%s/mt", drive->devfs_name); | ||
4716 | devfs_remove("%s/mtn", drive->devfs_name); | ||
4717 | devfs_unregister_tape(g->number); | ||
4718 | idetape_devs[tape->minor] = NULL; | ||
4719 | g->private_data = NULL; | ||
4720 | put_disk(g); | ||
4721 | kfree(tape); | ||
4722 | } | ||
4723 | |||
4724 | #ifdef CONFIG_PROC_FS | ||
4725 | |||
4726 | static int proc_idetape_read_name | ||
4727 | (char *page, char **start, off_t off, int count, int *eof, void *data) | ||
4728 | { | ||
4729 | ide_drive_t *drive = (ide_drive_t *) data; | ||
4730 | idetape_tape_t *tape = drive->driver_data; | ||
4731 | char *out = page; | ||
4732 | int len; | ||
4733 | |||
4734 | len = sprintf(out, "%s\n", tape->name); | ||
4735 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | ||
4736 | } | ||
4737 | |||
4738 | static ide_proc_entry_t idetape_proc[] = { | ||
4739 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | ||
4740 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | ||
4741 | { NULL, 0, NULL, NULL } | ||
4742 | }; | ||
4743 | |||
4744 | #else | ||
4745 | |||
4746 | #define idetape_proc NULL | ||
4747 | |||
4748 | #endif | ||
4749 | |||
4750 | static int idetape_attach(ide_drive_t *drive); | ||
4751 | |||
4752 | /* | ||
4753 | * IDE subdriver functions, registered with ide.c | ||
4754 | */ | ||
4755 | static ide_driver_t idetape_driver = { | ||
4756 | .owner = THIS_MODULE, | ||
4757 | .name = "ide-tape", | ||
4758 | .version = IDETAPE_VERSION, | ||
4759 | .media = ide_tape, | ||
4760 | .busy = 1, | ||
4761 | .supports_dsc_overlap = 1, | ||
4762 | .cleanup = idetape_cleanup, | ||
4763 | .do_request = idetape_do_request, | ||
4764 | .end_request = idetape_end_request, | ||
4765 | .error = __ide_error, | ||
4766 | .abort = __ide_abort, | ||
4767 | .proc = idetape_proc, | ||
4768 | .attach = idetape_attach, | ||
4769 | .drives = LIST_HEAD_INIT(idetape_driver.drives), | ||
4770 | }; | ||
4771 | |||
4772 | /* | ||
4773 | * Our character device supporting functions, passed to register_chrdev. | ||
4774 | */ | ||
4775 | static struct file_operations idetape_fops = { | ||
4776 | .owner = THIS_MODULE, | ||
4777 | .read = idetape_chrdev_read, | ||
4778 | .write = idetape_chrdev_write, | ||
4779 | .ioctl = idetape_chrdev_ioctl, | ||
4780 | .open = idetape_chrdev_open, | ||
4781 | .release = idetape_chrdev_release, | ||
4782 | }; | ||
4783 | |||
4784 | static int idetape_open(struct inode *inode, struct file *filp) | ||
4785 | { | ||
4786 | struct gendisk *disk = inode->i_bdev->bd_disk; | ||
4787 | struct ide_tape_obj *tape; | ||
4788 | ide_drive_t *drive; | ||
4789 | |||
4790 | if (!(tape = ide_tape_get(disk))) | ||
4791 | return -ENXIO; | ||
4792 | |||
4793 | drive = tape->drive; | ||
4794 | |||
4795 | drive->usage++; | ||
4796 | |||
4797 | return 0; | ||
4798 | } | ||
4799 | |||
4800 | static int idetape_release(struct inode *inode, struct file *filp) | ||
4801 | { | ||
4802 | struct gendisk *disk = inode->i_bdev->bd_disk; | ||
4803 | struct ide_tape_obj *tape = ide_tape_g(disk); | ||
4804 | ide_drive_t *drive = tape->drive; | ||
4805 | |||
4806 | drive->usage--; | ||
4807 | |||
4808 | ide_tape_put(tape); | ||
4809 | |||
4810 | return 0; | ||
4811 | } | ||
4812 | |||
4813 | static int idetape_ioctl(struct inode *inode, struct file *file, | ||
4814 | unsigned int cmd, unsigned long arg) | ||
4815 | { | ||
4816 | struct block_device *bdev = inode->i_bdev; | ||
4817 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | ||
4818 | ide_drive_t *drive = tape->drive; | ||
4819 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | ||
4820 | if (err == -EINVAL) | ||
4821 | err = idetape_blkdev_ioctl(drive, cmd, arg); | ||
4822 | return err; | ||
4823 | } | ||
4824 | |||
4825 | static struct block_device_operations idetape_block_ops = { | ||
4826 | .owner = THIS_MODULE, | ||
4827 | .open = idetape_open, | ||
4828 | .release = idetape_release, | ||
4829 | .ioctl = idetape_ioctl, | ||
4830 | }; | ||
4831 | |||
4832 | static int idetape_attach (ide_drive_t *drive) | ||
4833 | { | ||
4834 | idetape_tape_t *tape; | ||
4835 | struct gendisk *g; | ||
4836 | int minor; | ||
4837 | |||
4838 | if (!strstr("ide-tape", drive->driver_req)) | ||
4839 | goto failed; | ||
4840 | if (!drive->present) | ||
4841 | goto failed; | ||
4842 | if (drive->media != ide_tape) | ||
4843 | goto failed; | ||
4844 | if (!idetape_identify_device (drive)) { | ||
4845 | printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); | ||
4846 | goto failed; | ||
4847 | } | ||
4848 | if (drive->scsi) { | ||
4849 | printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); | ||
4850 | goto failed; | ||
4851 | } | ||
4852 | if (strstr(drive->id->model, "OnStream DI-")) { | ||
4853 | printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); | ||
4854 | printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); | ||
4855 | } | ||
4856 | tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL); | ||
4857 | if (tape == NULL) { | ||
4858 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); | ||
4859 | goto failed; | ||
4860 | } | ||
4861 | |||
4862 | g = alloc_disk(1 << PARTN_BITS); | ||
4863 | if (!g) | ||
4864 | goto out_free_tape; | ||
4865 | |||
4866 | ide_init_disk(g, drive); | ||
4867 | |||
4868 | if (ide_register_subdriver(drive, &idetape_driver)) { | ||
4869 | printk(KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name); | ||
4870 | goto out_put_disk; | ||
4871 | } | ||
4872 | |||
4873 | memset(tape, 0, sizeof(*tape)); | ||
4874 | |||
4875 | kref_init(&tape->kref); | ||
4876 | |||
4877 | tape->drive = drive; | ||
4878 | tape->driver = &idetape_driver; | ||
4879 | tape->disk = g; | ||
4880 | |||
4881 | g->private_data = &tape->driver; | ||
4882 | |||
4883 | drive->driver_data = tape; | ||
4884 | |||
4885 | down(&idetape_ref_sem); | ||
4886 | for (minor = 0; idetape_devs[minor]; minor++) | ||
4887 | ; | ||
4888 | idetape_devs[minor] = tape; | ||
4889 | up(&idetape_ref_sem); | ||
4890 | |||
4891 | idetape_setup(drive, tape, minor); | ||
4892 | |||
4893 | devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor), | ||
4894 | S_IFCHR | S_IRUGO | S_IWUGO, | ||
4895 | "%s/mt", drive->devfs_name); | ||
4896 | devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor + 128), | ||
4897 | S_IFCHR | S_IRUGO | S_IWUGO, | ||
4898 | "%s/mtn", drive->devfs_name); | ||
4899 | |||
4900 | g->number = devfs_register_tape(drive->devfs_name); | ||
4901 | g->fops = &idetape_block_ops; | ||
4902 | ide_register_region(g); | ||
4903 | |||
4904 | return 0; | ||
4905 | out_put_disk: | ||
4906 | put_disk(g); | ||
4907 | out_free_tape: | ||
4908 | kfree(tape); | ||
4909 | failed: | ||
4910 | return 1; | ||
4911 | } | ||
4912 | |||
4913 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); | ||
4914 | MODULE_LICENSE("GPL"); | ||
4915 | |||
4916 | static void __exit idetape_exit (void) | ||
4917 | { | ||
4918 | ide_unregister_driver(&idetape_driver); | ||
4919 | unregister_chrdev(IDETAPE_MAJOR, "ht"); | ||
4920 | } | ||
4921 | |||
4922 | /* | ||
4923 | * idetape_init will register the driver for each tape. | ||
4924 | */ | ||
4925 | static int idetape_init (void) | ||
4926 | { | ||
4927 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { | ||
4928 | printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); | ||
4929 | return -EBUSY; | ||
4930 | } | ||
4931 | ide_register_driver(&idetape_driver); | ||
4932 | return 0; | ||
4933 | } | ||
4934 | |||
4935 | module_init(idetape_init); | ||
4936 | module_exit(idetape_exit); | ||
4937 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | ||