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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; | |
80ce45fd | 2906 | msleep(100); |
1da177e4 LT |
2907 | } |
2908 | return -EIO; | |
2909 | } | |
2910 | ||
2911 | static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) | |
2912 | { | |
2913 | return __idetape_queue_pc_tail(drive, pc); | |
2914 | } | |
2915 | ||
2916 | static int idetape_flush_tape_buffers (ide_drive_t *drive) | |
2917 | { | |
2918 | idetape_pc_t pc; | |
2919 | int rc; | |
2920 | ||
2921 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
2922 | if ((rc = idetape_queue_pc_tail(drive, &pc))) | |
2923 | return rc; | |
2924 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
2925 | return 0; | |
2926 | } | |
2927 | ||
2928 | static void idetape_create_read_position_cmd (idetape_pc_t *pc) | |
2929 | { | |
2930 | idetape_init_pc(pc); | |
2931 | pc->c[0] = IDETAPE_READ_POSITION_CMD; | |
2932 | pc->request_transfer = 20; | |
2933 | pc->callback = &idetape_read_position_callback; | |
2934 | } | |
2935 | ||
2936 | static int idetape_read_position (ide_drive_t *drive) | |
2937 | { | |
2938 | idetape_tape_t *tape = drive->driver_data; | |
2939 | idetape_pc_t pc; | |
2940 | int position; | |
2941 | ||
2942 | #if IDETAPE_DEBUG_LOG | |
2943 | if (tape->debug_level >= 4) | |
2944 | printk(KERN_INFO "ide-tape: Reached idetape_read_position\n"); | |
2945 | #endif /* IDETAPE_DEBUG_LOG */ | |
2946 | ||
2947 | idetape_create_read_position_cmd(&pc); | |
2948 | if (idetape_queue_pc_tail(drive, &pc)) | |
2949 | return -1; | |
2950 | position = tape->first_frame_position; | |
2951 | return position; | |
2952 | } | |
2953 | ||
2954 | static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip) | |
2955 | { | |
2956 | idetape_init_pc(pc); | |
2957 | pc->c[0] = IDETAPE_LOCATE_CMD; | |
2958 | pc->c[1] = 2; | |
2959 | put_unaligned(htonl(block), (unsigned int *) &pc->c[3]); | |
2960 | pc->c[8] = partition; | |
2961 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | |
2962 | pc->callback = &idetape_pc_callback; | |
2963 | } | |
2964 | ||
2965 | static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) | |
2966 | { | |
2967 | idetape_tape_t *tape = drive->driver_data; | |
2968 | ||
2969 | if (!tape->capabilities.lock) | |
2970 | return 0; | |
2971 | ||
2972 | idetape_init_pc(pc); | |
2973 | pc->c[0] = IDETAPE_PREVENT_CMD; | |
2974 | pc->c[4] = prevent; | |
2975 | pc->callback = &idetape_pc_callback; | |
2976 | return 1; | |
2977 | } | |
2978 | ||
2979 | static int __idetape_discard_read_pipeline (ide_drive_t *drive) | |
2980 | { | |
2981 | idetape_tape_t *tape = drive->driver_data; | |
2982 | unsigned long flags; | |
2983 | int cnt; | |
2984 | ||
2985 | if (tape->chrdev_direction != idetape_direction_read) | |
2986 | return 0; | |
2987 | ||
2988 | /* Remove merge stage. */ | |
2989 | cnt = tape->merge_stage_size / tape->tape_block_size; | |
2990 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) | |
2991 | ++cnt; /* Filemarks count as 1 sector */ | |
2992 | tape->merge_stage_size = 0; | |
2993 | if (tape->merge_stage != NULL) { | |
2994 | __idetape_kfree_stage(tape->merge_stage); | |
2995 | tape->merge_stage = NULL; | |
2996 | } | |
2997 | ||
2998 | /* Clear pipeline flags. */ | |
2999 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | |
3000 | tape->chrdev_direction = idetape_direction_none; | |
3001 | ||
3002 | /* Remove pipeline stages. */ | |
3003 | if (tape->first_stage == NULL) | |
3004 | return 0; | |
3005 | ||
3006 | spin_lock_irqsave(&tape->spinlock, flags); | |
3007 | tape->next_stage = NULL; | |
3008 | if (idetape_pipeline_active(tape)) | |
3009 | idetape_wait_for_request(drive, tape->active_data_request); | |
3010 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3011 | ||
3012 | while (tape->first_stage != NULL) { | |
3013 | struct request *rq_ptr = &tape->first_stage->rq; | |
3014 | ||
3015 | cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors; | |
3016 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) | |
3017 | ++cnt; | |
3018 | idetape_remove_stage_head(drive); | |
3019 | } | |
3020 | tape->nr_pending_stages = 0; | |
3021 | tape->max_stages = tape->min_pipeline; | |
3022 | return cnt; | |
3023 | } | |
3024 | ||
3025 | /* | |
3026 | * idetape_position_tape positions the tape to the requested block | |
3027 | * using the LOCATE packet command. A READ POSITION command is then | |
3028 | * issued to check where we are positioned. | |
3029 | * | |
3030 | * Like all higher level operations, we queue the commands at the tail | |
3031 | * of the request queue and wait for their completion. | |
3032 | * | |
3033 | */ | |
3034 | static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip) | |
3035 | { | |
3036 | idetape_tape_t *tape = drive->driver_data; | |
3037 | int retval; | |
3038 | idetape_pc_t pc; | |
3039 | ||
3040 | if (tape->chrdev_direction == idetape_direction_read) | |
3041 | __idetape_discard_read_pipeline(drive); | |
3042 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
3043 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
3044 | retval = idetape_queue_pc_tail(drive, &pc); | |
3045 | if (retval) | |
3046 | return (retval); | |
3047 | ||
3048 | idetape_create_read_position_cmd(&pc); | |
3049 | return (idetape_queue_pc_tail(drive, &pc)); | |
3050 | } | |
3051 | ||
3052 | static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) | |
3053 | { | |
3054 | idetape_tape_t *tape = drive->driver_data; | |
3055 | int cnt; | |
3056 | int seek, position; | |
3057 | ||
3058 | cnt = __idetape_discard_read_pipeline(drive); | |
3059 | if (restore_position) { | |
3060 | position = idetape_read_position(drive); | |
3061 | seek = position > cnt ? position - cnt : 0; | |
3062 | if (idetape_position_tape(drive, seek, 0, 0)) { | |
3063 | printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); | |
3064 | return; | |
3065 | } | |
3066 | } | |
3067 | } | |
3068 | ||
3069 | /* | |
3070 | * idetape_queue_rw_tail generates a read/write request for the block | |
3071 | * device interface and wait for it to be serviced. | |
3072 | */ | |
3073 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh) | |
3074 | { | |
3075 | idetape_tape_t *tape = drive->driver_data; | |
3076 | struct request rq; | |
3077 | ||
3078 | #if IDETAPE_DEBUG_LOG | |
3079 | if (tape->debug_level >= 2) | |
3080 | printk(KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); | |
3081 | #endif /* IDETAPE_DEBUG_LOG */ | |
3082 | #if IDETAPE_DEBUG_BUGS | |
3083 | if (idetape_pipeline_active(tape)) { | |
3084 | printk(KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); | |
3085 | return (0); | |
3086 | } | |
3087 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3088 | ||
3089 | idetape_init_rq(&rq, cmd); | |
3090 | rq.rq_disk = tape->disk; | |
3091 | rq.special = (void *)bh; | |
3092 | rq.sector = tape->first_frame_position; | |
3093 | rq.nr_sectors = rq.current_nr_sectors = blocks; | |
3094 | (void) ide_do_drive_cmd(drive, &rq, ide_wait); | |
3095 | ||
3096 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
3097 | return 0; | |
3098 | ||
3099 | if (tape->merge_stage) | |
3100 | idetape_init_merge_stage(tape); | |
3101 | if (rq.errors == IDETAPE_ERROR_GENERAL) | |
3102 | return -EIO; | |
3103 | return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); | |
3104 | } | |
3105 | ||
3106 | /* | |
3107 | * idetape_insert_pipeline_into_queue is used to start servicing the | |
3108 | * pipeline stages, starting from tape->next_stage. | |
3109 | */ | |
3110 | static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) | |
3111 | { | |
3112 | idetape_tape_t *tape = drive->driver_data; | |
3113 | ||
3114 | if (tape->next_stage == NULL) | |
3115 | return; | |
3116 | if (!idetape_pipeline_active(tape)) { | |
3117 | set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); | |
3118 | idetape_active_next_stage(drive); | |
3119 | (void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end); | |
3120 | } | |
3121 | } | |
3122 | ||
3123 | static void idetape_create_inquiry_cmd (idetape_pc_t *pc) | |
3124 | { | |
3125 | idetape_init_pc(pc); | |
3126 | pc->c[0] = IDETAPE_INQUIRY_CMD; | |
3127 | pc->c[4] = pc->request_transfer = 254; | |
3128 | pc->callback = &idetape_pc_callback; | |
3129 | } | |
3130 | ||
3131 | static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) | |
3132 | { | |
3133 | idetape_init_pc(pc); | |
3134 | pc->c[0] = IDETAPE_REWIND_CMD; | |
3135 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | |
3136 | pc->callback = &idetape_pc_callback; | |
3137 | } | |
3138 | ||
3139 | #if 0 | |
3140 | static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) | |
3141 | { | |
3142 | idetape_init_pc(pc); | |
3143 | set_bit(PC_WRITING, &pc->flags); | |
3144 | pc->c[0] = IDETAPE_MODE_SELECT_CMD; | |
3145 | pc->c[1] = 0x10; | |
3146 | put_unaligned(htons(length), (unsigned short *) &pc->c[3]); | |
3147 | pc->request_transfer = 255; | |
3148 | pc->callback = &idetape_pc_callback; | |
3149 | } | |
3150 | #endif | |
3151 | ||
3152 | static void idetape_create_erase_cmd (idetape_pc_t *pc) | |
3153 | { | |
3154 | idetape_init_pc(pc); | |
3155 | pc->c[0] = IDETAPE_ERASE_CMD; | |
3156 | pc->c[1] = 1; | |
3157 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | |
3158 | pc->callback = &idetape_pc_callback; | |
3159 | } | |
3160 | ||
3161 | static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd) | |
3162 | { | |
3163 | idetape_init_pc(pc); | |
3164 | pc->c[0] = IDETAPE_SPACE_CMD; | |
3165 | put_unaligned(htonl(count), (unsigned int *) &pc->c[1]); | |
3166 | pc->c[1] = cmd; | |
3167 | set_bit(PC_WAIT_FOR_DSC, &pc->flags); | |
3168 | pc->callback = &idetape_pc_callback; | |
3169 | } | |
3170 | ||
3171 | static void idetape_wait_first_stage (ide_drive_t *drive) | |
3172 | { | |
3173 | idetape_tape_t *tape = drive->driver_data; | |
3174 | unsigned long flags; | |
3175 | ||
3176 | if (tape->first_stage == NULL) | |
3177 | return; | |
3178 | spin_lock_irqsave(&tape->spinlock, flags); | |
3179 | if (tape->active_stage == tape->first_stage) | |
3180 | idetape_wait_for_request(drive, tape->active_data_request); | |
3181 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3182 | } | |
3183 | ||
3184 | /* | |
3185 | * idetape_add_chrdev_write_request tries to add a character device | |
3186 | * originated write request to our pipeline. In case we don't succeed, | |
3187 | * we revert to non-pipelined operation mode for this request. | |
3188 | * | |
3189 | * 1. Try to allocate a new pipeline stage. | |
3190 | * 2. If we can't, wait for more and more requests to be serviced | |
3191 | * and try again each time. | |
3192 | * 3. If we still can't allocate a stage, fallback to | |
3193 | * non-pipelined operation mode for this request. | |
3194 | */ | |
3195 | static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) | |
3196 | { | |
3197 | idetape_tape_t *tape = drive->driver_data; | |
3198 | idetape_stage_t *new_stage; | |
3199 | unsigned long flags; | |
3200 | struct request *rq; | |
3201 | ||
3202 | #if IDETAPE_DEBUG_LOG | |
3203 | if (tape->debug_level >= 3) | |
3204 | printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); | |
3205 | #endif /* IDETAPE_DEBUG_LOG */ | |
3206 | ||
3207 | /* | |
3208 | * Attempt to allocate a new stage. | |
3209 | * Pay special attention to possible race conditions. | |
3210 | */ | |
3211 | while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) { | |
3212 | spin_lock_irqsave(&tape->spinlock, flags); | |
3213 | if (idetape_pipeline_active(tape)) { | |
3214 | idetape_wait_for_request(drive, tape->active_data_request); | |
3215 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3216 | } else { | |
3217 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3218 | idetape_insert_pipeline_into_queue(drive); | |
3219 | if (idetape_pipeline_active(tape)) | |
3220 | continue; | |
3221 | /* | |
3222 | * Linux is short on memory. Fallback to | |
3223 | * non-pipelined operation mode for this request. | |
3224 | */ | |
3225 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); | |
3226 | } | |
3227 | } | |
3228 | rq = &new_stage->rq; | |
3229 | idetape_init_rq(rq, REQ_IDETAPE_WRITE); | |
3230 | /* Doesn't actually matter - We always assume sequential access */ | |
3231 | rq->sector = tape->first_frame_position; | |
3232 | rq->nr_sectors = rq->current_nr_sectors = blocks; | |
3233 | ||
3234 | idetape_switch_buffers(tape, new_stage); | |
3235 | idetape_add_stage_tail(drive, new_stage); | |
3236 | tape->pipeline_head++; | |
3237 | #if USE_IOTRACE | |
3238 | IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); | |
3239 | #endif | |
3240 | calculate_speeds(drive); | |
3241 | ||
3242 | /* | |
3243 | * Estimate whether the tape has stopped writing by checking | |
3244 | * if our write pipeline is currently empty. If we are not | |
3245 | * writing anymore, wait for the pipeline to be full enough | |
3246 | * (90%) before starting to service requests, so that we will | |
3247 | * be able to keep up with the higher speeds of the tape. | |
3248 | */ | |
3249 | if (!idetape_pipeline_active(tape)) { | |
3250 | if (tape->nr_stages >= tape->max_stages * 9 / 10 || | |
3251 | tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { | |
3252 | tape->measure_insert_time = 1; | |
3253 | tape->insert_time = jiffies; | |
3254 | tape->insert_size = 0; | |
3255 | tape->insert_speed = 0; | |
3256 | idetape_insert_pipeline_into_queue(drive); | |
3257 | } | |
3258 | } | |
3259 | if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) | |
3260 | /* Return a deferred error */ | |
3261 | return -EIO; | |
3262 | return blocks; | |
3263 | } | |
3264 | ||
3265 | /* | |
3266 | * idetape_wait_for_pipeline will wait until all pending pipeline | |
3267 | * requests are serviced. Typically called on device close. | |
3268 | */ | |
3269 | static void idetape_wait_for_pipeline (ide_drive_t *drive) | |
3270 | { | |
3271 | idetape_tape_t *tape = drive->driver_data; | |
3272 | unsigned long flags; | |
3273 | ||
3274 | while (tape->next_stage || idetape_pipeline_active(tape)) { | |
3275 | idetape_insert_pipeline_into_queue(drive); | |
3276 | spin_lock_irqsave(&tape->spinlock, flags); | |
3277 | if (idetape_pipeline_active(tape)) | |
3278 | idetape_wait_for_request(drive, tape->active_data_request); | |
3279 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3280 | } | |
3281 | } | |
3282 | ||
3283 | static void idetape_empty_write_pipeline (ide_drive_t *drive) | |
3284 | { | |
3285 | idetape_tape_t *tape = drive->driver_data; | |
3286 | int blocks, min; | |
3287 | struct idetape_bh *bh; | |
3288 | ||
3289 | #if IDETAPE_DEBUG_BUGS | |
3290 | if (tape->chrdev_direction != idetape_direction_write) { | |
3291 | printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); | |
3292 | return; | |
3293 | } | |
3294 | if (tape->merge_stage_size > tape->stage_size) { | |
3295 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); | |
3296 | tape->merge_stage_size = tape->stage_size; | |
3297 | } | |
3298 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3299 | if (tape->merge_stage_size) { | |
3300 | blocks = tape->merge_stage_size / tape->tape_block_size; | |
3301 | if (tape->merge_stage_size % tape->tape_block_size) { | |
3302 | unsigned int i; | |
3303 | ||
3304 | blocks++; | |
3305 | i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; | |
3306 | bh = tape->bh->b_reqnext; | |
3307 | while (bh) { | |
3308 | atomic_set(&bh->b_count, 0); | |
3309 | bh = bh->b_reqnext; | |
3310 | } | |
3311 | bh = tape->bh; | |
3312 | while (i) { | |
3313 | if (bh == NULL) { | |
3314 | ||
3315 | printk(KERN_INFO "ide-tape: bug, bh NULL\n"); | |
3316 | break; | |
3317 | } | |
3318 | min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count))); | |
3319 | memset(bh->b_data + atomic_read(&bh->b_count), 0, min); | |
3320 | atomic_add(min, &bh->b_count); | |
3321 | i -= min; | |
3322 | bh = bh->b_reqnext; | |
3323 | } | |
3324 | } | |
3325 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
3326 | tape->merge_stage_size = 0; | |
3327 | } | |
3328 | idetape_wait_for_pipeline(drive); | |
3329 | if (tape->merge_stage != NULL) { | |
3330 | __idetape_kfree_stage(tape->merge_stage); | |
3331 | tape->merge_stage = NULL; | |
3332 | } | |
3333 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | |
3334 | tape->chrdev_direction = idetape_direction_none; | |
3335 | ||
3336 | /* | |
3337 | * On the next backup, perform the feedback loop again. | |
3338 | * (I don't want to keep sense information between backups, | |
3339 | * as some systems are constantly on, and the system load | |
3340 | * can be totally different on the next backup). | |
3341 | */ | |
3342 | tape->max_stages = tape->min_pipeline; | |
3343 | #if IDETAPE_DEBUG_BUGS | |
3344 | if (tape->first_stage != NULL || | |
3345 | tape->next_stage != NULL || | |
3346 | tape->last_stage != NULL || | |
3347 | tape->nr_stages != 0) { | |
3348 | printk(KERN_ERR "ide-tape: ide-tape pipeline bug, " | |
3349 | "first_stage %p, next_stage %p, " | |
3350 | "last_stage %p, nr_stages %d\n", | |
3351 | tape->first_stage, tape->next_stage, | |
3352 | tape->last_stage, tape->nr_stages); | |
3353 | } | |
3354 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3355 | } | |
3356 | ||
3357 | static void idetape_restart_speed_control (ide_drive_t *drive) | |
3358 | { | |
3359 | idetape_tape_t *tape = drive->driver_data; | |
3360 | ||
3361 | tape->restart_speed_control_req = 0; | |
3362 | tape->pipeline_head = 0; | |
3363 | tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; | |
3364 | tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; | |
3365 | tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; | |
3366 | tape->uncontrolled_pipeline_head_speed = 0; | |
3367 | tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; | |
3368 | tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; | |
3369 | } | |
3370 | ||
3371 | static int idetape_initiate_read (ide_drive_t *drive, int max_stages) | |
3372 | { | |
3373 | idetape_tape_t *tape = drive->driver_data; | |
3374 | idetape_stage_t *new_stage; | |
3375 | struct request rq; | |
3376 | int bytes_read; | |
3377 | int blocks = tape->capabilities.ctl; | |
3378 | ||
3379 | /* Initialize read operation */ | |
3380 | if (tape->chrdev_direction != idetape_direction_read) { | |
3381 | if (tape->chrdev_direction == idetape_direction_write) { | |
3382 | idetape_empty_write_pipeline(drive); | |
3383 | idetape_flush_tape_buffers(drive); | |
3384 | } | |
3385 | #if IDETAPE_DEBUG_BUGS | |
3386 | if (tape->merge_stage || tape->merge_stage_size) { | |
3387 | printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); | |
3388 | tape->merge_stage_size = 0; | |
3389 | } | |
3390 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3391 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) | |
3392 | return -ENOMEM; | |
3393 | tape->chrdev_direction = idetape_direction_read; | |
3394 | ||
3395 | /* | |
3396 | * Issue a read 0 command to ensure that DSC handshake | |
3397 | * is switched from completion mode to buffer available | |
3398 | * mode. | |
3399 | * No point in issuing this if DSC overlap isn't supported, | |
3400 | * some drives (Seagate STT3401A) will return an error. | |
3401 | */ | |
3402 | if (drive->dsc_overlap) { | |
3403 | bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh); | |
3404 | if (bytes_read < 0) { | |
3405 | __idetape_kfree_stage(tape->merge_stage); | |
3406 | tape->merge_stage = NULL; | |
3407 | tape->chrdev_direction = idetape_direction_none; | |
3408 | return bytes_read; | |
3409 | } | |
3410 | } | |
3411 | } | |
3412 | if (tape->restart_speed_control_req) | |
3413 | idetape_restart_speed_control(drive); | |
3414 | idetape_init_rq(&rq, REQ_IDETAPE_READ); | |
3415 | rq.sector = tape->first_frame_position; | |
3416 | rq.nr_sectors = rq.current_nr_sectors = blocks; | |
3417 | if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && | |
3418 | tape->nr_stages < max_stages) { | |
3419 | new_stage = idetape_kmalloc_stage(tape); | |
3420 | while (new_stage != NULL) { | |
3421 | new_stage->rq = rq; | |
3422 | idetape_add_stage_tail(drive, new_stage); | |
3423 | if (tape->nr_stages >= max_stages) | |
3424 | break; | |
3425 | new_stage = idetape_kmalloc_stage(tape); | |
3426 | } | |
3427 | } | |
3428 | if (!idetape_pipeline_active(tape)) { | |
3429 | if (tape->nr_pending_stages >= 3 * max_stages / 4) { | |
3430 | tape->measure_insert_time = 1; | |
3431 | tape->insert_time = jiffies; | |
3432 | tape->insert_size = 0; | |
3433 | tape->insert_speed = 0; | |
3434 | idetape_insert_pipeline_into_queue(drive); | |
3435 | } | |
3436 | } | |
3437 | return 0; | |
3438 | } | |
3439 | ||
3440 | /* | |
3441 | * idetape_add_chrdev_read_request is called from idetape_chrdev_read | |
3442 | * to service a character device read request and add read-ahead | |
3443 | * requests to our pipeline. | |
3444 | */ | |
3445 | static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) | |
3446 | { | |
3447 | idetape_tape_t *tape = drive->driver_data; | |
3448 | unsigned long flags; | |
3449 | struct request *rq_ptr; | |
3450 | int bytes_read; | |
3451 | ||
3452 | #if IDETAPE_DEBUG_LOG | |
3453 | if (tape->debug_level >= 4) | |
3454 | printk(KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); | |
3455 | #endif /* IDETAPE_DEBUG_LOG */ | |
3456 | ||
3457 | /* | |
3458 | * If we are at a filemark, return a read length of 0 | |
3459 | */ | |
3460 | if (test_bit(IDETAPE_FILEMARK, &tape->flags)) | |
3461 | return 0; | |
3462 | ||
3463 | /* | |
3464 | * Wait for the next block to be available at the head | |
3465 | * of the pipeline | |
3466 | */ | |
3467 | idetape_initiate_read(drive, tape->max_stages); | |
3468 | if (tape->first_stage == NULL) { | |
3469 | if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) | |
3470 | return 0; | |
3471 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh); | |
3472 | } | |
3473 | idetape_wait_first_stage(drive); | |
3474 | rq_ptr = &tape->first_stage->rq; | |
3475 | bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); | |
3476 | rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; | |
3477 | ||
3478 | ||
3479 | if (rq_ptr->errors == IDETAPE_ERROR_EOD) | |
3480 | return 0; | |
3481 | else { | |
3482 | idetape_switch_buffers(tape, tape->first_stage); | |
3483 | if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) | |
3484 | set_bit(IDETAPE_FILEMARK, &tape->flags); | |
3485 | spin_lock_irqsave(&tape->spinlock, flags); | |
3486 | idetape_remove_stage_head(drive); | |
3487 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3488 | tape->pipeline_head++; | |
3489 | #if USE_IOTRACE | |
3490 | IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); | |
3491 | #endif | |
3492 | calculate_speeds(drive); | |
3493 | } | |
3494 | #if IDETAPE_DEBUG_BUGS | |
3495 | if (bytes_read > blocks * tape->tape_block_size) { | |
3496 | printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); | |
3497 | bytes_read = blocks * tape->tape_block_size; | |
3498 | } | |
3499 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3500 | return (bytes_read); | |
3501 | } | |
3502 | ||
3503 | static void idetape_pad_zeros (ide_drive_t *drive, int bcount) | |
3504 | { | |
3505 | idetape_tape_t *tape = drive->driver_data; | |
3506 | struct idetape_bh *bh; | |
3507 | int blocks; | |
3508 | ||
3509 | while (bcount) { | |
3510 | unsigned int count; | |
3511 | ||
3512 | bh = tape->merge_stage->bh; | |
3513 | count = min(tape->stage_size, bcount); | |
3514 | bcount -= count; | |
3515 | blocks = count / tape->tape_block_size; | |
3516 | while (count) { | |
3517 | atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size)); | |
3518 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); | |
3519 | count -= atomic_read(&bh->b_count); | |
3520 | bh = bh->b_reqnext; | |
3521 | } | |
3522 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh); | |
3523 | } | |
3524 | } | |
3525 | ||
3526 | static int idetape_pipeline_size (ide_drive_t *drive) | |
3527 | { | |
3528 | idetape_tape_t *tape = drive->driver_data; | |
3529 | idetape_stage_t *stage; | |
3530 | struct request *rq; | |
3531 | int size = 0; | |
3532 | ||
3533 | idetape_wait_for_pipeline(drive); | |
3534 | stage = tape->first_stage; | |
3535 | while (stage != NULL) { | |
3536 | rq = &stage->rq; | |
3537 | size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); | |
3538 | if (rq->errors == IDETAPE_ERROR_FILEMARK) | |
3539 | size += tape->tape_block_size; | |
3540 | stage = stage->next; | |
3541 | } | |
3542 | size += tape->merge_stage_size; | |
3543 | return size; | |
3544 | } | |
3545 | ||
3546 | /* | |
3547 | * Rewinds the tape to the Beginning Of the current Partition (BOP). | |
3548 | * | |
3549 | * We currently support only one partition. | |
3550 | */ | |
3551 | static int idetape_rewind_tape (ide_drive_t *drive) | |
3552 | { | |
3553 | int retval; | |
3554 | idetape_pc_t pc; | |
3555 | #if IDETAPE_DEBUG_LOG | |
3556 | idetape_tape_t *tape = drive->driver_data; | |
3557 | if (tape->debug_level >= 2) | |
3558 | printk(KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); | |
3559 | #endif /* IDETAPE_DEBUG_LOG */ | |
3560 | ||
3561 | idetape_create_rewind_cmd(drive, &pc); | |
3562 | retval = idetape_queue_pc_tail(drive, &pc); | |
3563 | if (retval) | |
3564 | return retval; | |
3565 | ||
3566 | idetape_create_read_position_cmd(&pc); | |
3567 | retval = idetape_queue_pc_tail(drive, &pc); | |
3568 | if (retval) | |
3569 | return retval; | |
3570 | return 0; | |
3571 | } | |
3572 | ||
3573 | /* | |
3574 | * Our special ide-tape ioctl's. | |
3575 | * | |
3576 | * Currently there aren't any ioctl's. | |
3577 | * mtio.h compatible commands should be issued to the character device | |
3578 | * interface. | |
3579 | */ | |
3580 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg) | |
3581 | { | |
3582 | idetape_tape_t *tape = drive->driver_data; | |
3583 | idetape_config_t config; | |
3584 | void __user *argp = (void __user *)arg; | |
3585 | ||
3586 | #if IDETAPE_DEBUG_LOG | |
3587 | if (tape->debug_level >= 4) | |
3588 | printk(KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); | |
3589 | #endif /* IDETAPE_DEBUG_LOG */ | |
3590 | switch (cmd) { | |
3591 | case 0x0340: | |
3592 | if (copy_from_user(&config, argp, sizeof (idetape_config_t))) | |
3593 | return -EFAULT; | |
3594 | tape->best_dsc_rw_frequency = config.dsc_rw_frequency; | |
3595 | tape->max_stages = config.nr_stages; | |
3596 | break; | |
3597 | case 0x0350: | |
3598 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; | |
3599 | config.nr_stages = tape->max_stages; | |
3600 | if (copy_to_user(argp, &config, sizeof (idetape_config_t))) | |
3601 | return -EFAULT; | |
3602 | break; | |
3603 | default: | |
3604 | return -EIO; | |
3605 | } | |
3606 | return 0; | |
3607 | } | |
3608 | ||
3609 | /* | |
3610 | * idetape_space_over_filemarks is now a bit more complicated than just | |
3611 | * passing the command to the tape since we may have crossed some | |
3612 | * filemarks during our pipelined read-ahead mode. | |
3613 | * | |
3614 | * As a minor side effect, the pipeline enables us to support MTFSFM when | |
3615 | * the filemark is in our internal pipeline even if the tape doesn't | |
3616 | * support spacing over filemarks in the reverse direction. | |
3617 | */ | |
3618 | static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) | |
3619 | { | |
3620 | idetape_tape_t *tape = drive->driver_data; | |
3621 | idetape_pc_t pc; | |
3622 | unsigned long flags; | |
3623 | int retval,count=0; | |
3624 | ||
3625 | if (mt_count == 0) | |
3626 | return 0; | |
3627 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
3628 | if (!tape->capabilities.sprev) | |
3629 | return -EIO; | |
3630 | mt_count = - mt_count; | |
3631 | } | |
3632 | ||
3633 | if (tape->chrdev_direction == idetape_direction_read) { | |
3634 | /* | |
3635 | * We have a read-ahead buffer. Scan it for crossed | |
3636 | * filemarks. | |
3637 | */ | |
3638 | tape->merge_stage_size = 0; | |
3639 | if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags)) | |
3640 | ++count; | |
3641 | while (tape->first_stage != NULL) { | |
3642 | if (count == mt_count) { | |
3643 | if (mt_op == MTFSFM) | |
3644 | set_bit(IDETAPE_FILEMARK, &tape->flags); | |
3645 | return 0; | |
3646 | } | |
3647 | spin_lock_irqsave(&tape->spinlock, flags); | |
3648 | if (tape->first_stage == tape->active_stage) { | |
3649 | /* | |
3650 | * We have reached the active stage in the read pipeline. | |
3651 | * There is no point in allowing the drive to continue | |
3652 | * reading any farther, so we stop the pipeline. | |
3653 | * | |
3654 | * This section should be moved to a separate subroutine, | |
3655 | * because a similar function is performed in | |
3656 | * __idetape_discard_read_pipeline(), for example. | |
3657 | */ | |
3658 | tape->next_stage = NULL; | |
3659 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3660 | idetape_wait_first_stage(drive); | |
3661 | tape->next_stage = tape->first_stage->next; | |
3662 | } else | |
3663 | spin_unlock_irqrestore(&tape->spinlock, flags); | |
3664 | if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) | |
3665 | ++count; | |
3666 | idetape_remove_stage_head(drive); | |
3667 | } | |
3668 | idetape_discard_read_pipeline(drive, 0); | |
3669 | } | |
3670 | ||
3671 | /* | |
3672 | * The filemark was not found in our internal pipeline. | |
3673 | * Now we can issue the space command. | |
3674 | */ | |
3675 | switch (mt_op) { | |
3676 | case MTFSF: | |
3677 | case MTBSF: | |
3678 | idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); | |
3679 | return (idetape_queue_pc_tail(drive, &pc)); | |
3680 | case MTFSFM: | |
3681 | case MTBSFM: | |
3682 | if (!tape->capabilities.sprev) | |
3683 | return (-EIO); | |
3684 | retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count); | |
3685 | if (retval) return (retval); | |
3686 | count = (MTBSFM == mt_op ? 1 : -1); | |
3687 | return (idetape_space_over_filemarks(drive, MTFSF, count)); | |
3688 | default: | |
3689 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); | |
3690 | return (-EIO); | |
3691 | } | |
3692 | } | |
3693 | ||
3694 | ||
3695 | /* | |
3696 | * Our character device read / write functions. | |
3697 | * | |
3698 | * The tape is optimized to maximize throughput when it is transferring | |
3699 | * an integral number of the "continuous transfer limit", which is | |
3700 | * a parameter of the specific tape (26 KB on my particular tape). | |
3701 | * (32 kB for Onstream) | |
3702 | * | |
3703 | * As of version 1.3 of the driver, the character device provides an | |
3704 | * abstract continuous view of the media - any mix of block sizes (even 1 | |
3705 | * byte) on the same backup/restore procedure is supported. The driver | |
3706 | * will internally convert the requests to the recommended transfer unit, | |
3707 | * so that an unmatch between the user's block size to the recommended | |
3708 | * size will only result in a (slightly) increased driver overhead, but | |
3709 | * will no longer hit performance. | |
3710 | * This is not applicable to Onstream. | |
3711 | */ | |
3712 | static ssize_t idetape_chrdev_read (struct file *file, char __user *buf, | |
3713 | size_t count, loff_t *ppos) | |
3714 | { | |
3715 | struct ide_tape_obj *tape = ide_tape_f(file); | |
3716 | ide_drive_t *drive = tape->drive; | |
3717 | ssize_t bytes_read,temp, actually_read = 0, rc; | |
3718 | ||
3719 | #if IDETAPE_DEBUG_LOG | |
3720 | if (tape->debug_level >= 3) | |
3721 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); | |
3722 | #endif /* IDETAPE_DEBUG_LOG */ | |
3723 | ||
3724 | if (tape->chrdev_direction != idetape_direction_read) { | |
3725 | if (test_bit(IDETAPE_DETECT_BS, &tape->flags)) | |
3726 | if (count > tape->tape_block_size && | |
3727 | (count % tape->tape_block_size) == 0) | |
3728 | tape->user_bs_factor = count / tape->tape_block_size; | |
3729 | } | |
3730 | if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) | |
3731 | return rc; | |
3732 | if (count == 0) | |
3733 | return (0); | |
3734 | if (tape->merge_stage_size) { | |
3735 | actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count); | |
3736 | idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read); | |
3737 | buf += actually_read; | |
3738 | tape->merge_stage_size -= actually_read; | |
3739 | count -= actually_read; | |
3740 | } | |
3741 | while (count >= tape->stage_size) { | |
3742 | bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); | |
3743 | if (bytes_read <= 0) | |
3744 | goto finish; | |
3745 | idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read); | |
3746 | buf += bytes_read; | |
3747 | count -= bytes_read; | |
3748 | actually_read += bytes_read; | |
3749 | } | |
3750 | if (count) { | |
3751 | bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl); | |
3752 | if (bytes_read <= 0) | |
3753 | goto finish; | |
3754 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
3755 | idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp); | |
3756 | actually_read += temp; | |
3757 | tape->merge_stage_size = bytes_read-temp; | |
3758 | } | |
3759 | finish: | |
3760 | if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) { | |
3761 | #if IDETAPE_DEBUG_LOG | |
3762 | if (tape->debug_level >= 2) | |
3763 | printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); | |
3764 | #endif | |
3765 | idetape_space_over_filemarks(drive, MTFSF, 1); | |
3766 | return 0; | |
3767 | } | |
3768 | return actually_read; | |
3769 | } | |
3770 | ||
3771 | static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf, | |
3772 | size_t count, loff_t *ppos) | |
3773 | { | |
3774 | struct ide_tape_obj *tape = ide_tape_f(file); | |
3775 | ide_drive_t *drive = tape->drive; | |
3776 | ssize_t retval, actually_written = 0; | |
3777 | ||
3778 | /* The drive is write protected. */ | |
3779 | if (tape->write_prot) | |
3780 | return -EACCES; | |
3781 | ||
3782 | #if IDETAPE_DEBUG_LOG | |
3783 | if (tape->debug_level >= 3) | |
3784 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_write, " | |
3785 | "count %Zd\n", count); | |
3786 | #endif /* IDETAPE_DEBUG_LOG */ | |
3787 | ||
3788 | /* Initialize write operation */ | |
3789 | if (tape->chrdev_direction != idetape_direction_write) { | |
3790 | if (tape->chrdev_direction == idetape_direction_read) | |
3791 | idetape_discard_read_pipeline(drive, 1); | |
3792 | #if IDETAPE_DEBUG_BUGS | |
3793 | if (tape->merge_stage || tape->merge_stage_size) { | |
3794 | printk(KERN_ERR "ide-tape: merge_stage_size " | |
3795 | "should be 0 now\n"); | |
3796 | tape->merge_stage_size = 0; | |
3797 | } | |
3798 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3799 | if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL) | |
3800 | return -ENOMEM; | |
3801 | tape->chrdev_direction = idetape_direction_write; | |
3802 | idetape_init_merge_stage(tape); | |
3803 | ||
3804 | /* | |
3805 | * Issue a write 0 command to ensure that DSC handshake | |
3806 | * is switched from completion mode to buffer available | |
3807 | * mode. | |
3808 | * No point in issuing this if DSC overlap isn't supported, | |
3809 | * some drives (Seagate STT3401A) will return an error. | |
3810 | */ | |
3811 | if (drive->dsc_overlap) { | |
3812 | retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh); | |
3813 | if (retval < 0) { | |
3814 | __idetape_kfree_stage(tape->merge_stage); | |
3815 | tape->merge_stage = NULL; | |
3816 | tape->chrdev_direction = idetape_direction_none; | |
3817 | return retval; | |
3818 | } | |
3819 | } | |
3820 | } | |
3821 | if (count == 0) | |
3822 | return (0); | |
3823 | if (tape->restart_speed_control_req) | |
3824 | idetape_restart_speed_control(drive); | |
3825 | if (tape->merge_stage_size) { | |
3826 | #if IDETAPE_DEBUG_BUGS | |
3827 | if (tape->merge_stage_size >= tape->stage_size) { | |
3828 | printk(KERN_ERR "ide-tape: bug: merge buffer too big\n"); | |
3829 | tape->merge_stage_size = 0; | |
3830 | } | |
3831 | #endif /* IDETAPE_DEBUG_BUGS */ | |
3832 | actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count); | |
3833 | idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written); | |
3834 | buf += actually_written; | |
3835 | tape->merge_stage_size += actually_written; | |
3836 | count -= actually_written; | |
3837 | ||
3838 | if (tape->merge_stage_size == tape->stage_size) { | |
3839 | tape->merge_stage_size = 0; | |
3840 | retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); | |
3841 | if (retval <= 0) | |
3842 | return (retval); | |
3843 | } | |
3844 | } | |
3845 | while (count >= tape->stage_size) { | |
3846 | idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size); | |
3847 | buf += tape->stage_size; | |
3848 | count -= tape->stage_size; | |
3849 | retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl); | |
3850 | actually_written += tape->stage_size; | |
3851 | if (retval <= 0) | |
3852 | return (retval); | |
3853 | } | |
3854 | if (count) { | |
3855 | actually_written += count; | |
3856 | idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count); | |
3857 | tape->merge_stage_size += count; | |
3858 | } | |
3859 | return (actually_written); | |
3860 | } | |
3861 | ||
3862 | static int idetape_write_filemark (ide_drive_t *drive) | |
3863 | { | |
3864 | idetape_pc_t pc; | |
3865 | ||
3866 | /* Write a filemark */ | |
3867 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
3868 | if (idetape_queue_pc_tail(drive, &pc)) { | |
3869 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
3870 | return -EIO; | |
3871 | } | |
3872 | return 0; | |
3873 | } | |
3874 | ||
3875 | /* | |
3876 | * idetape_mtioctop is called from idetape_chrdev_ioctl when | |
3877 | * the general mtio MTIOCTOP ioctl is requested. | |
3878 | * | |
3879 | * We currently support the following mtio.h operations: | |
3880 | * | |
3881 | * MTFSF - Space over mt_count filemarks in the positive direction. | |
3882 | * The tape is positioned after the last spaced filemark. | |
3883 | * | |
3884 | * MTFSFM - Same as MTFSF, but the tape is positioned before the | |
3885 | * last filemark. | |
3886 | * | |
3887 | * MTBSF - Steps background over mt_count filemarks, tape is | |
3888 | * positioned before the last filemark. | |
3889 | * | |
3890 | * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. | |
3891 | * | |
3892 | * Note: | |
3893 | * | |
3894 | * MTBSF and MTBSFM are not supported when the tape doesn't | |
3895 | * support spacing over filemarks in the reverse direction. | |
3896 | * In this case, MTFSFM is also usually not supported (it is | |
3897 | * supported in the rare case in which we crossed the filemark | |
3898 | * during our read-ahead pipelined operation mode). | |
3899 | * | |
3900 | * MTWEOF - Writes mt_count filemarks. Tape is positioned after | |
3901 | * the last written filemark. | |
3902 | * | |
3903 | * MTREW - Rewinds tape. | |
3904 | * | |
3905 | * MTLOAD - Loads the tape. | |
3906 | * | |
3907 | * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and | |
3908 | * MTUNLOAD prevents further access until the media is replaced. | |
3909 | * | |
3910 | * MTNOP - Flushes tape buffers. | |
3911 | * | |
3912 | * MTRETEN - Retension media. This typically consists of one end | |
3913 | * to end pass on the media. | |
3914 | * | |
3915 | * MTEOM - Moves to the end of recorded data. | |
3916 | * | |
3917 | * MTERASE - Erases tape. | |
3918 | * | |
3919 | * MTSETBLK - Sets the user block size to mt_count bytes. If | |
3920 | * mt_count is 0, we will attempt to autodetect | |
3921 | * the block size. | |
3922 | * | |
3923 | * MTSEEK - Positions the tape in a specific block number, where | |
3924 | * each block is assumed to contain which user_block_size | |
3925 | * bytes. | |
3926 | * | |
3927 | * MTSETPART - Switches to another tape partition. | |
3928 | * | |
3929 | * MTLOCK - Locks the tape door. | |
3930 | * | |
3931 | * MTUNLOCK - Unlocks the tape door. | |
3932 | * | |
3933 | * The following commands are currently not supported: | |
3934 | * | |
3935 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, | |
3936 | * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. | |
3937 | */ | |
3938 | static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) | |
3939 | { | |
3940 | idetape_tape_t *tape = drive->driver_data; | |
3941 | idetape_pc_t pc; | |
3942 | int i,retval; | |
3943 | ||
3944 | #if IDETAPE_DEBUG_LOG | |
3945 | if (tape->debug_level >= 1) | |
3946 | printk(KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: " | |
3947 | "mt_op=%d, mt_count=%d\n", mt_op, mt_count); | |
3948 | #endif /* IDETAPE_DEBUG_LOG */ | |
3949 | /* | |
3950 | * Commands which need our pipelined read-ahead stages. | |
3951 | */ | |
3952 | switch (mt_op) { | |
3953 | case MTFSF: | |
3954 | case MTFSFM: | |
3955 | case MTBSF: | |
3956 | case MTBSFM: | |
3957 | if (!mt_count) | |
3958 | return (0); | |
3959 | return (idetape_space_over_filemarks(drive,mt_op,mt_count)); | |
3960 | default: | |
3961 | break; | |
3962 | } | |
3963 | switch (mt_op) { | |
3964 | case MTWEOF: | |
3965 | if (tape->write_prot) | |
3966 | return -EACCES; | |
3967 | idetape_discard_read_pipeline(drive, 1); | |
3968 | for (i = 0; i < mt_count; i++) { | |
3969 | retval = idetape_write_filemark(drive); | |
3970 | if (retval) | |
3971 | return retval; | |
3972 | } | |
3973 | return (0); | |
3974 | case MTREW: | |
3975 | idetape_discard_read_pipeline(drive, 0); | |
3976 | if (idetape_rewind_tape(drive)) | |
3977 | return -EIO; | |
3978 | return 0; | |
3979 | case MTLOAD: | |
3980 | idetape_discard_read_pipeline(drive, 0); | |
3981 | idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK); | |
3982 | return (idetape_queue_pc_tail(drive, &pc)); | |
3983 | case MTUNLOAD: | |
3984 | case MTOFFL: | |
3985 | /* | |
3986 | * If door is locked, attempt to unlock before | |
3987 | * attempting to eject. | |
3988 | */ | |
3989 | if (tape->door_locked) { | |
3990 | if (idetape_create_prevent_cmd(drive, &pc, 0)) | |
3991 | if (!idetape_queue_pc_tail(drive, &pc)) | |
3992 | tape->door_locked = DOOR_UNLOCKED; | |
3993 | } | |
3994 | idetape_discard_read_pipeline(drive, 0); | |
3995 | idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK); | |
3996 | retval = idetape_queue_pc_tail(drive, &pc); | |
3997 | if (!retval) | |
3998 | clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags); | |
3999 | return retval; | |
4000 | case MTNOP: | |
4001 | idetape_discard_read_pipeline(drive, 0); | |
4002 | return (idetape_flush_tape_buffers(drive)); | |
4003 | case MTRETEN: | |
4004 | idetape_discard_read_pipeline(drive, 0); | |
4005 | idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
4006 | return (idetape_queue_pc_tail(drive, &pc)); | |
4007 | case MTEOM: | |
4008 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
4009 | return (idetape_queue_pc_tail(drive, &pc)); | |
4010 | case MTERASE: | |
4011 | (void) idetape_rewind_tape(drive); | |
4012 | idetape_create_erase_cmd(&pc); | |
4013 | return (idetape_queue_pc_tail(drive, &pc)); | |
4014 | case MTSETBLK: | |
4015 | if (mt_count) { | |
4016 | if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) | |
4017 | return -EIO; | |
4018 | tape->user_bs_factor = mt_count / tape->tape_block_size; | |
4019 | clear_bit(IDETAPE_DETECT_BS, &tape->flags); | |
4020 | } else | |
4021 | set_bit(IDETAPE_DETECT_BS, &tape->flags); | |
4022 | return 0; | |
4023 | case MTSEEK: | |
4024 | idetape_discard_read_pipeline(drive, 0); | |
4025 | return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0); | |
4026 | case MTSETPART: | |
4027 | idetape_discard_read_pipeline(drive, 0); | |
4028 | return (idetape_position_tape(drive, 0, mt_count, 0)); | |
4029 | case MTFSR: | |
4030 | case MTBSR: | |
4031 | case MTLOCK: | |
4032 | if (!idetape_create_prevent_cmd(drive, &pc, 1)) | |
4033 | return 0; | |
4034 | retval = idetape_queue_pc_tail(drive, &pc); | |
4035 | if (retval) return retval; | |
4036 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; | |
4037 | return 0; | |
4038 | case MTUNLOCK: | |
4039 | if (!idetape_create_prevent_cmd(drive, &pc, 0)) | |
4040 | return 0; | |
4041 | retval = idetape_queue_pc_tail(drive, &pc); | |
4042 | if (retval) return retval; | |
4043 | tape->door_locked = DOOR_UNLOCKED; | |
4044 | return 0; | |
4045 | default: | |
4046 | printk(KERN_ERR "ide-tape: MTIO operation %d not " | |
4047 | "supported\n", mt_op); | |
4048 | return (-EIO); | |
4049 | } | |
4050 | } | |
4051 | ||
4052 | /* | |
4053 | * Our character device ioctls. | |
4054 | * | |
4055 | * General mtio.h magnetic io commands are supported here, and not in | |
4056 | * the corresponding block interface. | |
4057 | * | |
4058 | * The following ioctls are supported: | |
4059 | * | |
4060 | * MTIOCTOP - Refer to idetape_mtioctop for detailed description. | |
4061 | * | |
4062 | * MTIOCGET - The mt_dsreg field in the returned mtget structure | |
4063 | * will be set to (user block size in bytes << | |
4064 | * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. | |
4065 | * | |
4066 | * The mt_blkno is set to the current user block number. | |
4067 | * The other mtget fields are not supported. | |
4068 | * | |
4069 | * MTIOCPOS - The current tape "block position" is returned. We | |
4070 | * assume that each block contains user_block_size | |
4071 | * bytes. | |
4072 | * | |
4073 | * Our own ide-tape ioctls are supported on both interfaces. | |
4074 | */ | |
4075 | static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
4076 | { | |
4077 | struct ide_tape_obj *tape = ide_tape_f(file); | |
4078 | ide_drive_t *drive = tape->drive; | |
4079 | struct mtop mtop; | |
4080 | struct mtget mtget; | |
4081 | struct mtpos mtpos; | |
4082 | int block_offset = 0, position = tape->first_frame_position; | |
4083 | void __user *argp = (void __user *)arg; | |
4084 | ||
4085 | #if IDETAPE_DEBUG_LOG | |
4086 | if (tape->debug_level >= 3) | |
4087 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, " | |
4088 | "cmd=%u\n", cmd); | |
4089 | #endif /* IDETAPE_DEBUG_LOG */ | |
4090 | ||
4091 | tape->restart_speed_control_req = 1; | |
4092 | if (tape->chrdev_direction == idetape_direction_write) { | |
4093 | idetape_empty_write_pipeline(drive); | |
4094 | idetape_flush_tape_buffers(drive); | |
4095 | } | |
4096 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
4097 | block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor); | |
4098 | if ((position = idetape_read_position(drive)) < 0) | |
4099 | return -EIO; | |
4100 | } | |
4101 | switch (cmd) { | |
4102 | case MTIOCTOP: | |
4103 | if (copy_from_user(&mtop, argp, sizeof (struct mtop))) | |
4104 | return -EFAULT; | |
4105 | return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count)); | |
4106 | case MTIOCGET: | |
4107 | memset(&mtget, 0, sizeof (struct mtget)); | |
4108 | mtget.mt_type = MT_ISSCSI2; | |
4109 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
4110 | mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
4111 | if (tape->drv_write_prot) { | |
4112 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
4113 | } | |
4114 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
4115 | return -EFAULT; | |
4116 | return 0; | |
4117 | case MTIOCPOS: | |
4118 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
4119 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
4120 | return -EFAULT; | |
4121 | return 0; | |
4122 | default: | |
4123 | if (tape->chrdev_direction == idetape_direction_read) | |
4124 | idetape_discard_read_pipeline(drive, 1); | |
4125 | return idetape_blkdev_ioctl(drive, cmd, arg); | |
4126 | } | |
4127 | } | |
4128 | ||
4129 | static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive); | |
4130 | ||
4131 | /* | |
4132 | * Our character device open function. | |
4133 | */ | |
4134 | static int idetape_chrdev_open (struct inode *inode, struct file *filp) | |
4135 | { | |
4136 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
4137 | ide_drive_t *drive; | |
4138 | idetape_tape_t *tape; | |
4139 | idetape_pc_t pc; | |
4140 | int retval; | |
4141 | ||
4142 | /* | |
4143 | * We really want to do nonseekable_open(inode, filp); here, but some | |
4144 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
4145 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
4146 | */ | |
4147 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
4148 | ||
4149 | #if IDETAPE_DEBUG_LOG | |
4150 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); | |
4151 | #endif /* IDETAPE_DEBUG_LOG */ | |
4152 | ||
4153 | if (i >= MAX_HWIFS * MAX_DRIVES) | |
4154 | return -ENXIO; | |
4155 | ||
4156 | if (!(tape = ide_tape_chrdev_get(i))) | |
4157 | return -ENXIO; | |
4158 | ||
4159 | drive = tape->drive; | |
4160 | ||
4161 | filp->private_data = tape; | |
4162 | ||
4163 | if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) { | |
4164 | retval = -EBUSY; | |
4165 | goto out_put_tape; | |
4166 | } | |
4167 | ||
4168 | retval = idetape_wait_ready(drive, 60 * HZ); | |
4169 | if (retval) { | |
4170 | clear_bit(IDETAPE_BUSY, &tape->flags); | |
4171 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); | |
4172 | goto out_put_tape; | |
4173 | } | |
4174 | ||
4175 | idetape_read_position(drive); | |
4176 | if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags)) | |
4177 | (void)idetape_rewind_tape(drive); | |
4178 | ||
4179 | if (tape->chrdev_direction != idetape_direction_read) | |
4180 | clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); | |
4181 | ||
4182 | /* Read block size and write protect status from drive. */ | |
4183 | idetape_get_blocksize_from_block_descriptor(drive); | |
4184 | ||
4185 | /* Set write protect flag if device is opened as read-only. */ | |
4186 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
4187 | tape->write_prot = 1; | |
4188 | else | |
4189 | tape->write_prot = tape->drv_write_prot; | |
4190 | ||
4191 | /* Make sure drive isn't write protected if user wants to write. */ | |
4192 | if (tape->write_prot) { | |
4193 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
4194 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
4195 | clear_bit(IDETAPE_BUSY, &tape->flags); | |
4196 | retval = -EROFS; | |
4197 | goto out_put_tape; | |
4198 | } | |
4199 | } | |
4200 | ||
4201 | /* | |
4202 | * Lock the tape drive door so user can't eject. | |
4203 | */ | |
4204 | if (tape->chrdev_direction == idetape_direction_none) { | |
4205 | if (idetape_create_prevent_cmd(drive, &pc, 1)) { | |
4206 | if (!idetape_queue_pc_tail(drive, &pc)) { | |
4207 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
4208 | tape->door_locked = DOOR_LOCKED; | |
4209 | } | |
4210 | } | |
4211 | } | |
4212 | idetape_restart_speed_control(drive); | |
4213 | tape->restart_speed_control_req = 0; | |
4214 | return 0; | |
4215 | ||
4216 | out_put_tape: | |
4217 | ide_tape_put(tape); | |
4218 | return retval; | |
4219 | } | |
4220 | ||
4221 | static void idetape_write_release (ide_drive_t *drive, unsigned int minor) | |
4222 | { | |
4223 | idetape_tape_t *tape = drive->driver_data; | |
4224 | ||
4225 | idetape_empty_write_pipeline(drive); | |
4226 | tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0); | |
4227 | if (tape->merge_stage != NULL) { | |
4228 | idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1)); | |
4229 | __idetape_kfree_stage(tape->merge_stage); | |
4230 | tape->merge_stage = NULL; | |
4231 | } | |
4232 | idetape_write_filemark(drive); | |
4233 | idetape_flush_tape_buffers(drive); | |
4234 | idetape_flush_tape_buffers(drive); | |
4235 | } | |
4236 | ||
4237 | /* | |
4238 | * Our character device release function. | |
4239 | */ | |
4240 | static int idetape_chrdev_release (struct inode *inode, struct file *filp) | |
4241 | { | |
4242 | struct ide_tape_obj *tape = ide_tape_f(filp); | |
4243 | ide_drive_t *drive = tape->drive; | |
4244 | idetape_pc_t pc; | |
4245 | unsigned int minor = iminor(inode); | |
4246 | ||
4247 | lock_kernel(); | |
4248 | tape = drive->driver_data; | |
4249 | #if IDETAPE_DEBUG_LOG | |
4250 | if (tape->debug_level >= 3) | |
4251 | printk(KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); | |
4252 | #endif /* IDETAPE_DEBUG_LOG */ | |
4253 | ||
4254 | if (tape->chrdev_direction == idetape_direction_write) | |
4255 | idetape_write_release(drive, minor); | |
4256 | if (tape->chrdev_direction == idetape_direction_read) { | |
4257 | if (minor < 128) | |
4258 | idetape_discard_read_pipeline(drive, 1); | |
4259 | else | |
4260 | idetape_wait_for_pipeline(drive); | |
4261 | } | |
4262 | if (tape->cache_stage != NULL) { | |
4263 | __idetape_kfree_stage(tape->cache_stage); | |
4264 | tape->cache_stage = NULL; | |
4265 | } | |
4266 | if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags)) | |
4267 | (void) idetape_rewind_tape(drive); | |
4268 | if (tape->chrdev_direction == idetape_direction_none) { | |
4269 | if (tape->door_locked == DOOR_LOCKED) { | |
4270 | if (idetape_create_prevent_cmd(drive, &pc, 0)) { | |
4271 | if (!idetape_queue_pc_tail(drive, &pc)) | |
4272 | tape->door_locked = DOOR_UNLOCKED; | |
4273 | } | |
4274 | } | |
4275 | } | |
4276 | clear_bit(IDETAPE_BUSY, &tape->flags); | |
4277 | ide_tape_put(tape); | |
4278 | unlock_kernel(); | |
4279 | return 0; | |
4280 | } | |
4281 | ||
4282 | /* | |
4283 | * idetape_identify_device is called to check the contents of the | |
4284 | * ATAPI IDENTIFY command results. We return: | |
4285 | * | |
4286 | * 1 If the tape can be supported by us, based on the information | |
4287 | * we have so far. | |
4288 | * | |
4289 | * 0 If this tape driver is not currently supported by us. | |
4290 | */ | |
4291 | static int idetape_identify_device (ide_drive_t *drive) | |
4292 | { | |
4293 | struct idetape_id_gcw gcw; | |
4294 | struct hd_driveid *id = drive->id; | |
4295 | #if IDETAPE_DEBUG_INFO | |
4296 | unsigned short mask,i; | |
4297 | #endif /* IDETAPE_DEBUG_INFO */ | |
4298 | ||
4299 | if (drive->id_read == 0) | |
4300 | return 1; | |
4301 | ||
4302 | *((unsigned short *) &gcw) = id->config; | |
4303 | ||
4304 | #if IDETAPE_DEBUG_INFO | |
4305 | printk(KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); | |
4306 | printk(KERN_INFO "ide-tape: Protocol Type: "); | |
4307 | switch (gcw.protocol) { | |
4308 | case 0: case 1: printk("ATA\n");break; | |
4309 | case 2: printk("ATAPI\n");break; | |
4310 | case 3: printk("Reserved (Unknown to ide-tape)\n");break; | |
4311 | } | |
4312 | printk(KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); | |
4313 | switch (gcw.device_type) { | |
4314 | case 0: printk("Direct-access Device\n");break; | |
4315 | case 1: printk("Streaming Tape Device\n");break; | |
4316 | case 2: case 3: case 4: printk("Reserved\n");break; | |
4317 | case 5: printk("CD-ROM Device\n");break; | |
4318 | case 6: printk("Reserved\n"); | |
4319 | case 7: printk("Optical memory Device\n");break; | |
4320 | case 0x1f: printk("Unknown or no Device type\n");break; | |
4321 | default: printk("Reserved\n"); | |
4322 | } | |
4323 | printk(KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); | |
4324 | printk(KERN_INFO "ide-tape: Command Packet DRQ Type: "); | |
4325 | switch (gcw.drq_type) { | |
4326 | case 0: printk("Microprocessor DRQ\n");break; | |
4327 | case 1: printk("Interrupt DRQ\n");break; | |
4328 | case 2: printk("Accelerated DRQ\n");break; | |
4329 | case 3: printk("Reserved\n");break; | |
4330 | } | |
4331 | printk(KERN_INFO "ide-tape: Command Packet Size: "); | |
4332 | switch (gcw.packet_size) { | |
4333 | case 0: printk("12 bytes\n");break; | |
4334 | case 1: printk("16 bytes\n");break; | |
4335 | default: printk("Reserved\n");break; | |
4336 | } | |
4337 | printk(KERN_INFO "ide-tape: Model: %.40s\n",id->model); | |
4338 | printk(KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); | |
4339 | printk(KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); | |
4340 | printk(KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); | |
4341 | printk(KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); | |
4342 | printk(KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); | |
4343 | printk(KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); | |
4344 | printk(KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); | |
4345 | printk(KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); | |
4346 | printk(KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); | |
4347 | printk(KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); | |
4348 | printk(KERN_INFO "ide-tape: Single Word DMA supported modes: "); | |
4349 | for (i=0,mask=1;i<8;i++,mask=mask << 1) { | |
4350 | if (id->dma_1word & mask) | |
4351 | printk("%d ",i); | |
4352 | if (id->dma_1word & (mask << 8)) | |
4353 | printk("(active) "); | |
4354 | } | |
4355 | printk("\n"); | |
4356 | printk(KERN_INFO "ide-tape: Multi Word DMA supported modes: "); | |
4357 | for (i=0,mask=1;i<8;i++,mask=mask << 1) { | |
4358 | if (id->dma_mword & mask) | |
4359 | printk("%d ",i); | |
4360 | if (id->dma_mword & (mask << 8)) | |
4361 | printk("(active) "); | |
4362 | } | |
4363 | printk("\n"); | |
4364 | if (id->field_valid & 0x0002) { | |
4365 | printk(KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n", | |
4366 | id->eide_pio_modes & 1 ? "Mode 3":"None"); | |
4367 | printk(KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); | |
4368 | if (id->eide_dma_min == 0) | |
4369 | printk("Not supported\n"); | |
4370 | else | |
4371 | printk("%d ns\n",id->eide_dma_min); | |
4372 | ||
4373 | printk(KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); | |
4374 | if (id->eide_dma_time == 0) | |
4375 | printk("Not supported\n"); | |
4376 | else | |
4377 | printk("%d ns\n",id->eide_dma_time); | |
4378 | ||
4379 | printk(KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); | |
4380 | if (id->eide_pio == 0) | |
4381 | printk("Not supported\n"); | |
4382 | else | |
4383 | printk("%d ns\n",id->eide_pio); | |
4384 | ||
4385 | printk(KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); | |
4386 | if (id->eide_pio_iordy == 0) | |
4387 | printk("Not supported\n"); | |
4388 | else | |
4389 | printk("%d ns\n",id->eide_pio_iordy); | |
4390 | ||
4391 | } else | |
4392 | printk(KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); | |
4393 | #endif /* IDETAPE_DEBUG_INFO */ | |
4394 | ||
4395 | /* Check that we can support this device */ | |
4396 | ||
4397 | if (gcw.protocol !=2 ) | |
4398 | printk(KERN_ERR "ide-tape: Protocol is not ATAPI\n"); | |
4399 | else if (gcw.device_type != 1) | |
4400 | printk(KERN_ERR "ide-tape: Device type is not set to tape\n"); | |
4401 | else if (!gcw.removable) | |
4402 | printk(KERN_ERR "ide-tape: The removable flag is not set\n"); | |
4403 | else if (gcw.packet_size != 0) { | |
4404 | printk(KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); | |
4405 | if (gcw.packet_size == 1) | |
4406 | printk(KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); | |
4407 | } else | |
4408 | return 1; | |
4409 | return 0; | |
4410 | } | |
4411 | ||
4412 | /* | |
4413 | * Use INQUIRY to get the firmware revision | |
4414 | */ | |
4415 | static void idetape_get_inquiry_results (ide_drive_t *drive) | |
4416 | { | |
4417 | char *r; | |
4418 | idetape_tape_t *tape = drive->driver_data; | |
4419 | idetape_pc_t pc; | |
4420 | idetape_inquiry_result_t *inquiry; | |
4421 | ||
4422 | idetape_create_inquiry_cmd(&pc); | |
4423 | if (idetape_queue_pc_tail(drive, &pc)) { | |
4424 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); | |
4425 | return; | |
4426 | } | |
4427 | inquiry = (idetape_inquiry_result_t *) pc.buffer; | |
4428 | memcpy(tape->vendor_id, inquiry->vendor_id, 8); | |
4429 | memcpy(tape->product_id, inquiry->product_id, 16); | |
4430 | memcpy(tape->firmware_revision, inquiry->revision_level, 4); | |
4431 | ide_fixstring(tape->vendor_id, 10, 0); | |
4432 | ide_fixstring(tape->product_id, 18, 0); | |
4433 | ide_fixstring(tape->firmware_revision, 6, 0); | |
4434 | r = tape->firmware_revision; | |
4435 | if (*(r + 1) == '.') | |
4436 | tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; | |
4437 | 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); | |
4438 | } | |
4439 | ||
4440 | /* | |
4441 | * idetape_get_mode_sense_results asks the tape about its various | |
4442 | * parameters. In particular, we will adjust our data transfer buffer | |
4443 | * size to the recommended value as returned by the tape. | |
4444 | */ | |
4445 | static void idetape_get_mode_sense_results (ide_drive_t *drive) | |
4446 | { | |
4447 | idetape_tape_t *tape = drive->driver_data; | |
4448 | idetape_pc_t pc; | |
4449 | idetape_mode_parameter_header_t *header; | |
4450 | idetape_capabilities_page_t *capabilities; | |
4451 | ||
4452 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); | |
4453 | if (idetape_queue_pc_tail(drive, &pc)) { | |
4454 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); | |
4455 | tape->tape_block_size = 512; | |
4456 | tape->capabilities.ctl = 52; | |
4457 | tape->capabilities.speed = 450; | |
4458 | tape->capabilities.buffer_size = 6 * 52; | |
4459 | return; | |
4460 | } | |
4461 | header = (idetape_mode_parameter_header_t *) pc.buffer; | |
4462 | capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); | |
4463 | ||
4464 | capabilities->max_speed = ntohs(capabilities->max_speed); | |
4465 | capabilities->ctl = ntohs(capabilities->ctl); | |
4466 | capabilities->speed = ntohs(capabilities->speed); | |
4467 | capabilities->buffer_size = ntohs(capabilities->buffer_size); | |
4468 | ||
4469 | if (!capabilities->speed) { | |
4470 | printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); | |
4471 | capabilities->speed = 650; | |
4472 | } | |
4473 | if (!capabilities->max_speed) { | |
4474 | printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); | |
4475 | capabilities->max_speed = 650; | |
4476 | } | |
4477 | ||
4478 | tape->capabilities = *capabilities; /* Save us a copy */ | |
4479 | if (capabilities->blk512) | |
4480 | tape->tape_block_size = 512; | |
4481 | else if (capabilities->blk1024) | |
4482 | tape->tape_block_size = 1024; | |
4483 | ||
4484 | #if IDETAPE_DEBUG_INFO | |
4485 | printk(KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); | |
4486 | printk(KERN_INFO "ide-tape: Mode Parameter Header:\n"); | |
4487 | printk(KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); | |
4488 | printk(KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); | |
4489 | printk(KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); | |
4490 | printk(KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); | |
4491 | ||
4492 | printk(KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); | |
4493 | printk(KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); | |
4494 | printk(KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); | |
4495 | printk(KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); | |
4496 | printk(KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); | |
4497 | printk(KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); | |
4498 | printk(KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); | |
4499 | printk(KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); | |
4500 | printk(KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); | |
4501 | printk(KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); | |
4502 | printk(KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); | |
4503 | printk(KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); | |
4504 | printk(KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); | |
4505 | printk(KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); | |
4506 | printk(KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); | |
4507 | printk(KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); | |
4508 | printk(KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); | |
4509 | printk(KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); | |
4510 | printk(KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); | |
4511 | printk(KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); | |
4512 | #endif /* IDETAPE_DEBUG_INFO */ | |
4513 | } | |
4514 | ||
4515 | /* | |
4516 | * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor | |
4517 | * and if it succeeds sets the tape block size with the reported value | |
4518 | */ | |
4519 | static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) | |
4520 | { | |
4521 | ||
4522 | idetape_tape_t *tape = drive->driver_data; | |
4523 | idetape_pc_t pc; | |
4524 | idetape_mode_parameter_header_t *header; | |
4525 | idetape_parameter_block_descriptor_t *block_descrp; | |
4526 | ||
4527 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
4528 | if (idetape_queue_pc_tail(drive, &pc)) { | |
4529 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
4530 | if (tape->tape_block_size == 0) { | |
4531 | printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); | |
4532 | tape->tape_block_size = 32768; | |
4533 | } | |
4534 | return; | |
4535 | } | |
4536 | header = (idetape_mode_parameter_header_t *) pc.buffer; | |
4537 | block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); | |
4538 | tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; | |
4539 | tape->drv_write_prot = (header->dsp & 0x80) >> 7; | |
4540 | ||
4541 | #if IDETAPE_DEBUG_INFO | |
4542 | printk(KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); | |
4543 | #endif /* IDETAPE_DEBUG_INFO */ | |
4544 | } | |
4545 | static void idetape_add_settings (ide_drive_t *drive) | |
4546 | { | |
4547 | idetape_tape_t *tape = drive->driver_data; | |
4548 | ||
4549 | /* | |
4550 | * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function | |
4551 | */ | |
4552 | ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); | |
4553 | ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); | |
4554 | ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); | |
4555 | ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); | |
4556 | ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); | |
4557 | ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); | |
4558 | ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); | |
4559 | ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); | |
4560 | 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); | |
4561 | ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); | |
4562 | ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); | |
4563 | ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL); | |
4564 | ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); | |
4565 | ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); | |
4566 | } | |
4567 | ||
4568 | /* | |
4569 | * ide_setup is called to: | |
4570 | * | |
4571 | * 1. Initialize our various state variables. | |
4572 | * 2. Ask the tape for its capabilities. | |
4573 | * 3. Allocate a buffer which will be used for data | |
4574 | * transfer. The buffer size is chosen based on | |
4575 | * the recommendation which we received in step (2). | |
4576 | * | |
4577 | * Note that at this point ide.c already assigned us an irq, so that | |
4578 | * we can queue requests here and wait for their completion. | |
4579 | */ | |
4580 | static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) | |
4581 | { | |
4582 | unsigned long t1, tmid, tn, t; | |
4583 | int speed; | |
4584 | struct idetape_id_gcw gcw; | |
4585 | int stage_size; | |
4586 | struct sysinfo si; | |
4587 | ||
4588 | spin_lock_init(&tape->spinlock); | |
4589 | drive->dsc_overlap = 1; | |
4590 | #ifdef CONFIG_BLK_DEV_IDEPCI | |
4591 | if (HWIF(drive)->pci_dev != NULL) { | |
4592 | /* | |
4593 | * These two ide-pci host adapters appear to need DSC overlap disabled. | |
4594 | * This probably needs further analysis. | |
4595 | */ | |
4596 | if ((HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || | |
4597 | (HWIF(drive)->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { | |
4598 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); | |
4599 | drive->dsc_overlap = 0; | |
4600 | } | |
4601 | } | |
4602 | #endif /* CONFIG_BLK_DEV_IDEPCI */ | |
4603 | /* Seagate Travan drives do not support DSC overlap. */ | |
4604 | if (strstr(drive->id->model, "Seagate STT3401")) | |
4605 | drive->dsc_overlap = 0; | |
4606 | tape->minor = minor; | |
4607 | tape->name[0] = 'h'; | |
4608 | tape->name[1] = 't'; | |
4609 | tape->name[2] = '0' + minor; | |
4610 | tape->chrdev_direction = idetape_direction_none; | |
4611 | tape->pc = tape->pc_stack; | |
4612 | tape->max_insert_speed = 10000; | |
4613 | tape->speed_control = 1; | |
4614 | *((unsigned short *) &gcw) = drive->id->config; | |
4615 | if (gcw.drq_type == 1) | |
4616 | set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); | |
4617 | ||
4618 | tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; | |
4619 | ||
4620 | idetape_get_inquiry_results(drive); | |
4621 | idetape_get_mode_sense_results(drive); | |
4622 | idetape_get_blocksize_from_block_descriptor(drive); | |
4623 | tape->user_bs_factor = 1; | |
4624 | tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; | |
4625 | while (tape->stage_size > 0xffff) { | |
4626 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); | |
4627 | tape->capabilities.ctl /= 2; | |
4628 | tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; | |
4629 | } | |
4630 | stage_size = tape->stage_size; | |
4631 | tape->pages_per_stage = stage_size / PAGE_SIZE; | |
4632 | if (stage_size % PAGE_SIZE) { | |
4633 | tape->pages_per_stage++; | |
4634 | tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; | |
4635 | } | |
4636 | ||
4637 | /* | |
4638 | * Select the "best" DSC read/write polling frequency | |
4639 | * and pipeline size. | |
4640 | */ | |
4641 | speed = max(tape->capabilities.speed, tape->capabilities.max_speed); | |
4642 | ||
4643 | tape->max_stages = speed * 1000 * 10 / tape->stage_size; | |
4644 | ||
4645 | /* | |
4646 | * Limit memory use for pipeline to 10% of physical memory | |
4647 | */ | |
4648 | si_meminfo(&si); | |
4649 | if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) | |
4650 | tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); | |
4651 | tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES); | |
4652 | tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES); | |
4653 | tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES); | |
4654 | if (tape->max_stages == 0) | |
4655 | tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1; | |
4656 | ||
4657 | t1 = (tape->stage_size * HZ) / (speed * 1000); | |
4658 | tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); | |
4659 | tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); | |
4660 | ||
4661 | if (tape->max_stages) | |
4662 | t = tn; | |
4663 | else | |
4664 | t = t1; | |
4665 | ||
4666 | /* | |
4667 | * Ensure that the number we got makes sense; limit | |
4668 | * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
4669 | */ | |
4670 | tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); | |
4671 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " | |
4672 | "%dkB pipeline, %lums tDSC%s\n", | |
4673 | drive->name, tape->name, tape->capabilities.speed, | |
4674 | (tape->capabilities.buffer_size * 512) / tape->stage_size, | |
4675 | tape->stage_size / 1024, | |
4676 | tape->max_stages * tape->stage_size / 1024, | |
4677 | tape->best_dsc_rw_frequency * 1000 / HZ, | |
4678 | drive->using_dma ? ", DMA":""); | |
4679 | ||
4680 | idetape_add_settings(drive); | |
4681 | } | |
4682 | ||
8604affd | 4683 | static int ide_tape_remove(struct device *dev) |
1da177e4 | 4684 | { |
8604affd | 4685 | ide_drive_t *drive = to_ide_device(dev); |
1da177e4 | 4686 | idetape_tape_t *tape = drive->driver_data; |
1da177e4 | 4687 | |
8604affd | 4688 | ide_unregister_subdriver(drive, tape->driver); |
1da177e4 LT |
4689 | |
4690 | ide_unregister_region(tape->disk); | |
4691 | ||
4692 | ide_tape_put(tape); | |
4693 | ||
4694 | return 0; | |
4695 | } | |
4696 | ||
4697 | static void ide_tape_release(struct kref *kref) | |
4698 | { | |
4699 | struct ide_tape_obj *tape = to_ide_tape(kref); | |
4700 | ide_drive_t *drive = tape->drive; | |
4701 | struct gendisk *g = tape->disk; | |
4702 | ||
8604affd BZ |
4703 | BUG_ON(tape->first_stage != NULL || tape->merge_stage_size); |
4704 | ||
1da177e4 LT |
4705 | drive->dsc_overlap = 0; |
4706 | drive->driver_data = NULL; | |
4707 | devfs_remove("%s/mt", drive->devfs_name); | |
4708 | devfs_remove("%s/mtn", drive->devfs_name); | |
4709 | devfs_unregister_tape(g->number); | |
4710 | idetape_devs[tape->minor] = NULL; | |
4711 | g->private_data = NULL; | |
4712 | put_disk(g); | |
4713 | kfree(tape); | |
4714 | } | |
4715 | ||
4716 | #ifdef CONFIG_PROC_FS | |
4717 | ||
4718 | static int proc_idetape_read_name | |
4719 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
4720 | { | |
4721 | ide_drive_t *drive = (ide_drive_t *) data; | |
4722 | idetape_tape_t *tape = drive->driver_data; | |
4723 | char *out = page; | |
4724 | int len; | |
4725 | ||
4726 | len = sprintf(out, "%s\n", tape->name); | |
4727 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
4728 | } | |
4729 | ||
4730 | static ide_proc_entry_t idetape_proc[] = { | |
4731 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
4732 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
4733 | { NULL, 0, NULL, NULL } | |
4734 | }; | |
4735 | ||
4736 | #else | |
4737 | ||
4738 | #define idetape_proc NULL | |
4739 | ||
4740 | #endif | |
4741 | ||
8604affd | 4742 | static int ide_tape_probe(struct device *); |
1da177e4 | 4743 | |
1da177e4 LT |
4744 | static ide_driver_t idetape_driver = { |
4745 | .owner = THIS_MODULE, | |
8604affd BZ |
4746 | .gen_driver = { |
4747 | .name = "ide-tape", | |
4748 | .bus = &ide_bus_type, | |
4749 | .probe = ide_tape_probe, | |
4750 | .remove = ide_tape_remove, | |
4751 | }, | |
1da177e4 LT |
4752 | .version = IDETAPE_VERSION, |
4753 | .media = ide_tape, | |
1da177e4 | 4754 | .supports_dsc_overlap = 1, |
1da177e4 LT |
4755 | .do_request = idetape_do_request, |
4756 | .end_request = idetape_end_request, | |
4757 | .error = __ide_error, | |
4758 | .abort = __ide_abort, | |
4759 | .proc = idetape_proc, | |
1da177e4 LT |
4760 | }; |
4761 | ||
4762 | /* | |
4763 | * Our character device supporting functions, passed to register_chrdev. | |
4764 | */ | |
4765 | static struct file_operations idetape_fops = { | |
4766 | .owner = THIS_MODULE, | |
4767 | .read = idetape_chrdev_read, | |
4768 | .write = idetape_chrdev_write, | |
4769 | .ioctl = idetape_chrdev_ioctl, | |
4770 | .open = idetape_chrdev_open, | |
4771 | .release = idetape_chrdev_release, | |
4772 | }; | |
4773 | ||
4774 | static int idetape_open(struct inode *inode, struct file *filp) | |
4775 | { | |
4776 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
4777 | struct ide_tape_obj *tape; | |
4778 | ide_drive_t *drive; | |
4779 | ||
4780 | if (!(tape = ide_tape_get(disk))) | |
4781 | return -ENXIO; | |
4782 | ||
4783 | drive = tape->drive; | |
4784 | ||
4785 | drive->usage++; | |
4786 | ||
4787 | return 0; | |
4788 | } | |
4789 | ||
4790 | static int idetape_release(struct inode *inode, struct file *filp) | |
4791 | { | |
4792 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
4793 | struct ide_tape_obj *tape = ide_tape_g(disk); | |
4794 | ide_drive_t *drive = tape->drive; | |
4795 | ||
4796 | drive->usage--; | |
4797 | ||
4798 | ide_tape_put(tape); | |
4799 | ||
4800 | return 0; | |
4801 | } | |
4802 | ||
4803 | static int idetape_ioctl(struct inode *inode, struct file *file, | |
4804 | unsigned int cmd, unsigned long arg) | |
4805 | { | |
4806 | struct block_device *bdev = inode->i_bdev; | |
4807 | struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk); | |
4808 | ide_drive_t *drive = tape->drive; | |
4809 | int err = generic_ide_ioctl(drive, file, bdev, cmd, arg); | |
4810 | if (err == -EINVAL) | |
4811 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
4812 | return err; | |
4813 | } | |
4814 | ||
4815 | static struct block_device_operations idetape_block_ops = { | |
4816 | .owner = THIS_MODULE, | |
4817 | .open = idetape_open, | |
4818 | .release = idetape_release, | |
4819 | .ioctl = idetape_ioctl, | |
4820 | }; | |
4821 | ||
8604affd | 4822 | static int ide_tape_probe(struct device *dev) |
1da177e4 | 4823 | { |
8604affd | 4824 | ide_drive_t *drive = to_ide_device(dev); |
1da177e4 LT |
4825 | idetape_tape_t *tape; |
4826 | struct gendisk *g; | |
4827 | int minor; | |
4828 | ||
4829 | if (!strstr("ide-tape", drive->driver_req)) | |
4830 | goto failed; | |
4831 | if (!drive->present) | |
4832 | goto failed; | |
4833 | if (drive->media != ide_tape) | |
4834 | goto failed; | |
4835 | if (!idetape_identify_device (drive)) { | |
4836 | printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); | |
4837 | goto failed; | |
4838 | } | |
4839 | if (drive->scsi) { | |
4840 | printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); | |
4841 | goto failed; | |
4842 | } | |
4843 | if (strstr(drive->id->model, "OnStream DI-")) { | |
4844 | printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name); | |
4845 | printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n"); | |
4846 | } | |
4847 | tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL); | |
4848 | if (tape == NULL) { | |
4849 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); | |
4850 | goto failed; | |
4851 | } | |
4852 | ||
4853 | g = alloc_disk(1 << PARTN_BITS); | |
4854 | if (!g) | |
4855 | goto out_free_tape; | |
4856 | ||
4857 | ide_init_disk(g, drive); | |
4858 | ||
8604affd | 4859 | ide_register_subdriver(drive, &idetape_driver); |
1da177e4 LT |
4860 | |
4861 | memset(tape, 0, sizeof(*tape)); | |
4862 | ||
4863 | kref_init(&tape->kref); | |
4864 | ||
4865 | tape->drive = drive; | |
4866 | tape->driver = &idetape_driver; | |
4867 | tape->disk = g; | |
4868 | ||
4869 | g->private_data = &tape->driver; | |
4870 | ||
4871 | drive->driver_data = tape; | |
4872 | ||
4873 | down(&idetape_ref_sem); | |
4874 | for (minor = 0; idetape_devs[minor]; minor++) | |
4875 | ; | |
4876 | idetape_devs[minor] = tape; | |
4877 | up(&idetape_ref_sem); | |
4878 | ||
4879 | idetape_setup(drive, tape, minor); | |
4880 | ||
4881 | devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor), | |
4882 | S_IFCHR | S_IRUGO | S_IWUGO, | |
4883 | "%s/mt", drive->devfs_name); | |
4884 | devfs_mk_cdev(MKDEV(HWIF(drive)->major, minor + 128), | |
4885 | S_IFCHR | S_IRUGO | S_IWUGO, | |
4886 | "%s/mtn", drive->devfs_name); | |
4887 | ||
4888 | g->number = devfs_register_tape(drive->devfs_name); | |
4889 | g->fops = &idetape_block_ops; | |
4890 | ide_register_region(g); | |
4891 | ||
4892 | return 0; | |
8604affd | 4893 | |
1da177e4 LT |
4894 | out_free_tape: |
4895 | kfree(tape); | |
4896 | failed: | |
8604affd | 4897 | return -ENODEV; |
1da177e4 LT |
4898 | } |
4899 | ||
4900 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); | |
4901 | MODULE_LICENSE("GPL"); | |
4902 | ||
4903 | static void __exit idetape_exit (void) | |
4904 | { | |
8604affd | 4905 | driver_unregister(&idetape_driver.gen_driver); |
1da177e4 LT |
4906 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
4907 | } | |
4908 | ||
4909 | /* | |
4910 | * idetape_init will register the driver for each tape. | |
4911 | */ | |
4912 | static int idetape_init (void) | |
4913 | { | |
4914 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { | |
4915 | printk(KERN_ERR "ide-tape: Failed to register character device interface\n"); | |
4916 | return -EBUSY; | |
4917 | } | |
8604affd | 4918 | return driver_register(&idetape_driver.gen_driver); |
1da177e4 LT |
4919 | } |
4920 | ||
4921 | module_init(idetape_init); | |
4922 | module_exit(idetape_exit); | |
4923 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |