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1 | /* | |
2 | * IDE ATAPI streaming tape driver. | |
3 | * | |
4 | * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il> | |
5 | * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz | |
6 | * | |
7 | * This driver was constructed as a student project in the software laboratory | |
8 | * of the faculty of electrical engineering in the Technion - Israel's | |
9 | * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. | |
10 | * | |
11 | * It is hereby placed under the terms of the GNU general public license. | |
12 | * (See linux/COPYING). | |
13 | * | |
14 | * For a historical changelog see | |
15 | * Documentation/ide/ChangeLog.ide-tape.1995-2002 | |
16 | */ | |
17 | ||
18 | #define DRV_NAME "ide-tape" | |
19 | ||
20 | #define IDETAPE_VERSION "1.20" | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/timer.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/jiffies.h> | |
31 | #include <linux/major.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/genhd.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/pci.h> | |
36 | #include <linux/ide.h> | |
37 | #include <linux/smp_lock.h> | |
38 | #include <linux/completion.h> | |
39 | #include <linux/bitops.h> | |
40 | #include <linux/mutex.h> | |
41 | #include <scsi/scsi.h> | |
42 | ||
43 | #include <asm/byteorder.h> | |
44 | #include <linux/irq.h> | |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/io.h> | |
47 | #include <asm/unaligned.h> | |
48 | #include <linux/mtio.h> | |
49 | ||
50 | enum { | |
51 | /* output errors only */ | |
52 | DBG_ERR = (1 << 0), | |
53 | /* output all sense key/asc */ | |
54 | DBG_SENSE = (1 << 1), | |
55 | /* info regarding all chrdev-related procedures */ | |
56 | DBG_CHRDEV = (1 << 2), | |
57 | /* all remaining procedures */ | |
58 | DBG_PROCS = (1 << 3), | |
59 | }; | |
60 | ||
61 | /* define to see debug info */ | |
62 | #define IDETAPE_DEBUG_LOG 0 | |
63 | ||
64 | #if IDETAPE_DEBUG_LOG | |
65 | #define debug_log(lvl, fmt, args...) \ | |
66 | { \ | |
67 | if (tape->debug_mask & lvl) \ | |
68 | printk(KERN_INFO "ide-tape: " fmt, ## args); \ | |
69 | } | |
70 | #else | |
71 | #define debug_log(lvl, fmt, args...) do {} while (0) | |
72 | #endif | |
73 | ||
74 | /**************************** Tunable parameters *****************************/ | |
75 | /* | |
76 | * After each failed packet command we issue a request sense command and retry | |
77 | * the packet command IDETAPE_MAX_PC_RETRIES times. | |
78 | * | |
79 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. | |
80 | */ | |
81 | #define IDETAPE_MAX_PC_RETRIES 3 | |
82 | ||
83 | /* | |
84 | * The following parameter is used to select the point in the internal tape fifo | |
85 | * in which we will start to refill the buffer. Decreasing the following | |
86 | * parameter will improve the system's latency and interactive response, while | |
87 | * using a high value might improve system throughput. | |
88 | */ | |
89 | #define IDETAPE_FIFO_THRESHOLD 2 | |
90 | ||
91 | /* | |
92 | * DSC polling parameters. | |
93 | * | |
94 | * Polling for DSC (a single bit in the status register) is a very important | |
95 | * function in ide-tape. There are two cases in which we poll for DSC: | |
96 | * | |
97 | * 1. Before a read/write packet command, to ensure that we can transfer data | |
98 | * from/to the tape's data buffers, without causing an actual media access. | |
99 | * In case the tape is not ready yet, we take out our request from the device | |
100 | * request queue, so that ide.c could service requests from the other device | |
101 | * on the same interface in the meantime. | |
102 | * | |
103 | * 2. After the successful initialization of a "media access packet command", | |
104 | * which is a command that can take a long time to complete (the interval can | |
105 | * range from several seconds to even an hour). Again, we postpone our request | |
106 | * in the middle to free the bus for the other device. The polling frequency | |
107 | * here should be lower than the read/write frequency since those media access | |
108 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST | |
109 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD | |
110 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). | |
111 | * | |
112 | * We also set a timeout for the timer, in case something goes wrong. The | |
113 | * timeout should be longer then the maximum execution time of a tape operation. | |
114 | */ | |
115 | ||
116 | /* DSC timings. */ | |
117 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ | |
118 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ | |
119 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ | |
120 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ | |
121 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ | |
122 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ | |
123 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ | |
124 | ||
125 | /*************************** End of tunable parameters ***********************/ | |
126 | ||
127 | /* tape directions */ | |
128 | enum { | |
129 | IDETAPE_DIR_NONE = (1 << 0), | |
130 | IDETAPE_DIR_READ = (1 << 1), | |
131 | IDETAPE_DIR_WRITE = (1 << 2), | |
132 | }; | |
133 | ||
134 | struct idetape_bh { | |
135 | u32 b_size; | |
136 | atomic_t b_count; | |
137 | struct idetape_bh *b_reqnext; | |
138 | char *b_data; | |
139 | }; | |
140 | ||
141 | /* Tape door status */ | |
142 | #define DOOR_UNLOCKED 0 | |
143 | #define DOOR_LOCKED 1 | |
144 | #define DOOR_EXPLICITLY_LOCKED 2 | |
145 | ||
146 | /* Some defines for the SPACE command */ | |
147 | #define IDETAPE_SPACE_OVER_FILEMARK 1 | |
148 | #define IDETAPE_SPACE_TO_EOD 3 | |
149 | ||
150 | /* Some defines for the LOAD UNLOAD command */ | |
151 | #define IDETAPE_LU_LOAD_MASK 1 | |
152 | #define IDETAPE_LU_RETENSION_MASK 2 | |
153 | #define IDETAPE_LU_EOT_MASK 4 | |
154 | ||
155 | /* Error codes returned in rq->errors to the higher part of the driver. */ | |
156 | #define IDETAPE_ERROR_GENERAL 101 | |
157 | #define IDETAPE_ERROR_FILEMARK 102 | |
158 | #define IDETAPE_ERROR_EOD 103 | |
159 | ||
160 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ | |
161 | #define IDETAPE_BLOCK_DESCRIPTOR 0 | |
162 | #define IDETAPE_CAPABILITIES_PAGE 0x2a | |
163 | ||
164 | /* | |
165 | * Most of our global data which we need to save even as we leave the driver due | |
166 | * to an interrupt or a timer event is stored in the struct defined below. | |
167 | */ | |
168 | typedef struct ide_tape_obj { | |
169 | ide_drive_t *drive; | |
170 | struct ide_driver *driver; | |
171 | struct gendisk *disk; | |
172 | struct device dev; | |
173 | ||
174 | /* | |
175 | * failed_pc points to the last failed packet command, or contains | |
176 | * NULL if we do not need to retry any packet command. This is | |
177 | * required since an additional packet command is needed before the | |
178 | * retry, to get detailed information on what went wrong. | |
179 | */ | |
180 | /* Last failed packet command */ | |
181 | struct ide_atapi_pc *failed_pc; | |
182 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ | |
183 | struct ide_atapi_pc queued_pc; | |
184 | ||
185 | /* | |
186 | * DSC polling variables. | |
187 | * | |
188 | * While polling for DSC we use postponed_rq to postpone the current | |
189 | * request so that ide.c will be able to service pending requests on the | |
190 | * other device. Note that at most we will have only one DSC (usually | |
191 | * data transfer) request in the device request queue. | |
192 | */ | |
193 | struct request *postponed_rq; | |
194 | /* The time in which we started polling for DSC */ | |
195 | unsigned long dsc_polling_start; | |
196 | /* Timer used to poll for dsc */ | |
197 | struct timer_list dsc_timer; | |
198 | /* Read/Write dsc polling frequency */ | |
199 | unsigned long best_dsc_rw_freq; | |
200 | unsigned long dsc_poll_freq; | |
201 | unsigned long dsc_timeout; | |
202 | ||
203 | /* Read position information */ | |
204 | u8 partition; | |
205 | /* Current block */ | |
206 | unsigned int first_frame; | |
207 | ||
208 | /* Last error information */ | |
209 | u8 sense_key, asc, ascq; | |
210 | ||
211 | /* Character device operation */ | |
212 | unsigned int minor; | |
213 | /* device name */ | |
214 | char name[4]; | |
215 | /* Current character device data transfer direction */ | |
216 | u8 chrdev_dir; | |
217 | ||
218 | /* tape block size, usually 512 or 1024 bytes */ | |
219 | unsigned short blk_size; | |
220 | int user_bs_factor; | |
221 | ||
222 | /* Copy of the tape's Capabilities and Mechanical Page */ | |
223 | u8 caps[20]; | |
224 | ||
225 | /* | |
226 | * Active data transfer request parameters. | |
227 | * | |
228 | * At most, there is only one ide-tape originated data transfer request | |
229 | * in the device request queue. This allows ide.c to easily service | |
230 | * requests from the other device when we postpone our active request. | |
231 | */ | |
232 | ||
233 | /* Data buffer size chosen based on the tape's recommendation */ | |
234 | int buffer_size; | |
235 | /* merge buffer */ | |
236 | struct idetape_bh *merge_bh; | |
237 | /* size of the merge buffer */ | |
238 | int merge_bh_size; | |
239 | /* pointer to current buffer head within the merge buffer */ | |
240 | struct idetape_bh *bh; | |
241 | char *b_data; | |
242 | int b_count; | |
243 | ||
244 | int pages_per_buffer; | |
245 | /* Wasted space in each stage */ | |
246 | int excess_bh_size; | |
247 | ||
248 | /* protects the ide-tape queue */ | |
249 | spinlock_t lock; | |
250 | ||
251 | /* Measures average tape speed */ | |
252 | unsigned long avg_time; | |
253 | int avg_size; | |
254 | int avg_speed; | |
255 | ||
256 | /* the door is currently locked */ | |
257 | int door_locked; | |
258 | /* the tape hardware is write protected */ | |
259 | char drv_write_prot; | |
260 | /* the tape is write protected (hardware or opened as read-only) */ | |
261 | char write_prot; | |
262 | ||
263 | u32 debug_mask; | |
264 | } idetape_tape_t; | |
265 | ||
266 | static DEFINE_MUTEX(idetape_ref_mutex); | |
267 | ||
268 | static struct class *idetape_sysfs_class; | |
269 | ||
270 | static void ide_tape_release(struct device *); | |
271 | ||
272 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk) | |
273 | { | |
274 | struct ide_tape_obj *tape = NULL; | |
275 | ||
276 | mutex_lock(&idetape_ref_mutex); | |
277 | tape = ide_drv_g(disk, ide_tape_obj); | |
278 | if (tape) { | |
279 | if (ide_device_get(tape->drive)) | |
280 | tape = NULL; | |
281 | else | |
282 | get_device(&tape->dev); | |
283 | } | |
284 | mutex_unlock(&idetape_ref_mutex); | |
285 | return tape; | |
286 | } | |
287 | ||
288 | static void ide_tape_put(struct ide_tape_obj *tape) | |
289 | { | |
290 | ide_drive_t *drive = tape->drive; | |
291 | ||
292 | mutex_lock(&idetape_ref_mutex); | |
293 | put_device(&tape->dev); | |
294 | ide_device_put(drive); | |
295 | mutex_unlock(&idetape_ref_mutex); | |
296 | } | |
297 | ||
298 | /* | |
299 | * The variables below are used for the character device interface. Additional | |
300 | * state variables are defined in our ide_drive_t structure. | |
301 | */ | |
302 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; | |
303 | ||
304 | static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i) | |
305 | { | |
306 | struct ide_tape_obj *tape = NULL; | |
307 | ||
308 | mutex_lock(&idetape_ref_mutex); | |
309 | tape = idetape_devs[i]; | |
310 | if (tape) | |
311 | get_device(&tape->dev); | |
312 | mutex_unlock(&idetape_ref_mutex); | |
313 | return tape; | |
314 | } | |
315 | ||
316 | static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
317 | unsigned int bcount) | |
318 | { | |
319 | struct idetape_bh *bh = pc->bh; | |
320 | int count; | |
321 | ||
322 | while (bcount) { | |
323 | if (bh == NULL) { | |
324 | printk(KERN_ERR "ide-tape: bh == NULL in " | |
325 | "idetape_input_buffers\n"); | |
326 | ide_pad_transfer(drive, 0, bcount); | |
327 | return; | |
328 | } | |
329 | count = min( | |
330 | (unsigned int)(bh->b_size - atomic_read(&bh->b_count)), | |
331 | bcount); | |
332 | drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data + | |
333 | atomic_read(&bh->b_count), count); | |
334 | bcount -= count; | |
335 | atomic_add(count, &bh->b_count); | |
336 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
337 | bh = bh->b_reqnext; | |
338 | if (bh) | |
339 | atomic_set(&bh->b_count, 0); | |
340 | } | |
341 | } | |
342 | pc->bh = bh; | |
343 | } | |
344 | ||
345 | static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
346 | unsigned int bcount) | |
347 | { | |
348 | struct idetape_bh *bh = pc->bh; | |
349 | int count; | |
350 | ||
351 | while (bcount) { | |
352 | if (bh == NULL) { | |
353 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", | |
354 | __func__); | |
355 | return; | |
356 | } | |
357 | count = min((unsigned int)pc->b_count, (unsigned int)bcount); | |
358 | drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count); | |
359 | bcount -= count; | |
360 | pc->b_data += count; | |
361 | pc->b_count -= count; | |
362 | if (!pc->b_count) { | |
363 | bh = bh->b_reqnext; | |
364 | pc->bh = bh; | |
365 | if (bh) { | |
366 | pc->b_data = bh->b_data; | |
367 | pc->b_count = atomic_read(&bh->b_count); | |
368 | } | |
369 | } | |
370 | } | |
371 | } | |
372 | ||
373 | static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc) | |
374 | { | |
375 | struct idetape_bh *bh = pc->bh; | |
376 | int count; | |
377 | unsigned int bcount = pc->xferred; | |
378 | ||
379 | if (pc->flags & PC_FLAG_WRITING) | |
380 | return; | |
381 | while (bcount) { | |
382 | if (bh == NULL) { | |
383 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", | |
384 | __func__); | |
385 | return; | |
386 | } | |
387 | count = min((unsigned int)bh->b_size, (unsigned int)bcount); | |
388 | atomic_set(&bh->b_count, count); | |
389 | if (atomic_read(&bh->b_count) == bh->b_size) | |
390 | bh = bh->b_reqnext; | |
391 | bcount -= count; | |
392 | } | |
393 | pc->bh = bh; | |
394 | } | |
395 | ||
396 | /* | |
397 | * called on each failed packet command retry to analyze the request sense. We | |
398 | * currently do not utilize this information. | |
399 | */ | |
400 | static void idetape_analyze_error(ide_drive_t *drive, u8 *sense) | |
401 | { | |
402 | idetape_tape_t *tape = drive->driver_data; | |
403 | struct ide_atapi_pc *pc = tape->failed_pc; | |
404 | ||
405 | tape->sense_key = sense[2] & 0xF; | |
406 | tape->asc = sense[12]; | |
407 | tape->ascq = sense[13]; | |
408 | ||
409 | debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n", | |
410 | pc->c[0], tape->sense_key, tape->asc, tape->ascq); | |
411 | ||
412 | /* Correct pc->xferred by asking the tape. */ | |
413 | if (pc->flags & PC_FLAG_DMA_ERROR) { | |
414 | pc->xferred = pc->req_xfer - | |
415 | tape->blk_size * | |
416 | get_unaligned_be32(&sense[3]); | |
417 | idetape_update_buffers(drive, pc); | |
418 | } | |
419 | ||
420 | /* | |
421 | * If error was the result of a zero-length read or write command, | |
422 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives | |
423 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. | |
424 | */ | |
425 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) | |
426 | /* length == 0 */ | |
427 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { | |
428 | if (tape->sense_key == 5) { | |
429 | /* don't report an error, everything's ok */ | |
430 | pc->error = 0; | |
431 | /* don't retry read/write */ | |
432 | pc->flags |= PC_FLAG_ABORT; | |
433 | } | |
434 | } | |
435 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { | |
436 | pc->error = IDETAPE_ERROR_FILEMARK; | |
437 | pc->flags |= PC_FLAG_ABORT; | |
438 | } | |
439 | if (pc->c[0] == WRITE_6) { | |
440 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd | |
441 | && tape->asc == 0x0 && tape->ascq == 0x2)) { | |
442 | pc->error = IDETAPE_ERROR_EOD; | |
443 | pc->flags |= PC_FLAG_ABORT; | |
444 | } | |
445 | } | |
446 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
447 | if (tape->sense_key == 8) { | |
448 | pc->error = IDETAPE_ERROR_EOD; | |
449 | pc->flags |= PC_FLAG_ABORT; | |
450 | } | |
451 | if (!(pc->flags & PC_FLAG_ABORT) && | |
452 | pc->xferred) | |
453 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; | |
454 | } | |
455 | } | |
456 | ||
457 | /* Free data buffers completely. */ | |
458 | static void ide_tape_kfree_buffer(idetape_tape_t *tape) | |
459 | { | |
460 | struct idetape_bh *prev_bh, *bh = tape->merge_bh; | |
461 | ||
462 | while (bh) { | |
463 | u32 size = bh->b_size; | |
464 | ||
465 | while (size) { | |
466 | unsigned int order = fls(size >> PAGE_SHIFT)-1; | |
467 | ||
468 | if (bh->b_data) | |
469 | free_pages((unsigned long)bh->b_data, order); | |
470 | ||
471 | size &= (order-1); | |
472 | bh->b_data += (1 << order) * PAGE_SIZE; | |
473 | } | |
474 | prev_bh = bh; | |
475 | bh = bh->b_reqnext; | |
476 | kfree(prev_bh); | |
477 | } | |
478 | } | |
479 | ||
480 | static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects) | |
481 | { | |
482 | struct request *rq = drive->hwif->rq; | |
483 | idetape_tape_t *tape = drive->driver_data; | |
484 | unsigned long flags; | |
485 | int error; | |
486 | ||
487 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
488 | ||
489 | switch (uptodate) { | |
490 | case 0: error = IDETAPE_ERROR_GENERAL; break; | |
491 | case 1: error = 0; break; | |
492 | default: error = uptodate; | |
493 | } | |
494 | rq->errors = error; | |
495 | if (error) | |
496 | tape->failed_pc = NULL; | |
497 | ||
498 | if (!blk_special_request(rq)) { | |
499 | ide_end_request(drive, uptodate, nr_sects); | |
500 | return 0; | |
501 | } | |
502 | ||
503 | spin_lock_irqsave(&tape->lock, flags); | |
504 | ||
505 | ide_end_drive_cmd(drive, 0, 0); | |
506 | ||
507 | spin_unlock_irqrestore(&tape->lock, flags); | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static void ide_tape_handle_dsc(ide_drive_t *); | |
512 | ||
513 | static void ide_tape_callback(ide_drive_t *drive, int dsc) | |
514 | { | |
515 | idetape_tape_t *tape = drive->driver_data; | |
516 | struct ide_atapi_pc *pc = drive->pc; | |
517 | int uptodate = pc->error ? 0 : 1; | |
518 | ||
519 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
520 | ||
521 | if (dsc) | |
522 | ide_tape_handle_dsc(drive); | |
523 | ||
524 | if (tape->failed_pc == pc) | |
525 | tape->failed_pc = NULL; | |
526 | ||
527 | if (pc->c[0] == REQUEST_SENSE) { | |
528 | if (uptodate) | |
529 | idetape_analyze_error(drive, pc->buf); | |
530 | else | |
531 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " | |
532 | "itself - Aborting request!\n"); | |
533 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { | |
534 | struct request *rq = drive->hwif->rq; | |
535 | int blocks = pc->xferred / tape->blk_size; | |
536 | ||
537 | tape->avg_size += blocks * tape->blk_size; | |
538 | ||
539 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { | |
540 | tape->avg_speed = tape->avg_size * HZ / | |
541 | (jiffies - tape->avg_time) / 1024; | |
542 | tape->avg_size = 0; | |
543 | tape->avg_time = jiffies; | |
544 | } | |
545 | ||
546 | tape->first_frame += blocks; | |
547 | rq->current_nr_sectors -= blocks; | |
548 | ||
549 | if (pc->error) | |
550 | uptodate = pc->error; | |
551 | } else if (pc->c[0] == READ_POSITION && uptodate) { | |
552 | u8 *readpos = pc->buf; | |
553 | ||
554 | debug_log(DBG_SENSE, "BOP - %s\n", | |
555 | (readpos[0] & 0x80) ? "Yes" : "No"); | |
556 | debug_log(DBG_SENSE, "EOP - %s\n", | |
557 | (readpos[0] & 0x40) ? "Yes" : "No"); | |
558 | ||
559 | if (readpos[0] & 0x4) { | |
560 | printk(KERN_INFO "ide-tape: Block location is unknown" | |
561 | "to the tape\n"); | |
562 | clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); | |
563 | uptodate = 0; | |
564 | } else { | |
565 | debug_log(DBG_SENSE, "Block Location - %u\n", | |
566 | be32_to_cpup((__be32 *)&readpos[4])); | |
567 | ||
568 | tape->partition = readpos[1]; | |
569 | tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]); | |
570 | set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags); | |
571 | } | |
572 | } | |
573 | ||
574 | idetape_end_request(drive, uptodate, 0); | |
575 | } | |
576 | ||
577 | /* | |
578 | * Postpone the current request so that ide.c will be able to service requests | |
579 | * from another device on the same port while we are polling for DSC. | |
580 | */ | |
581 | static void idetape_postpone_request(ide_drive_t *drive) | |
582 | { | |
583 | idetape_tape_t *tape = drive->driver_data; | |
584 | ||
585 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
586 | ||
587 | tape->postponed_rq = drive->hwif->rq; | |
588 | ||
589 | ide_stall_queue(drive, tape->dsc_poll_freq); | |
590 | } | |
591 | ||
592 | static void ide_tape_handle_dsc(ide_drive_t *drive) | |
593 | { | |
594 | idetape_tape_t *tape = drive->driver_data; | |
595 | ||
596 | /* Media access command */ | |
597 | tape->dsc_polling_start = jiffies; | |
598 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; | |
599 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; | |
600 | /* Allow ide.c to handle other requests */ | |
601 | idetape_postpone_request(drive); | |
602 | } | |
603 | ||
604 | static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc, | |
605 | unsigned int bcount, int write) | |
606 | { | |
607 | if (write) | |
608 | idetape_output_buffers(drive, pc, bcount); | |
609 | else | |
610 | idetape_input_buffers(drive, pc, bcount); | |
611 | ||
612 | return bcount; | |
613 | } | |
614 | ||
615 | /* | |
616 | * Packet Command Interface | |
617 | * | |
618 | * The current Packet Command is available in drive->pc, and will not change | |
619 | * until we finish handling it. Each packet command is associated with a | |
620 | * callback function that will be called when the command is finished. | |
621 | * | |
622 | * The handling will be done in three stages: | |
623 | * | |
624 | * 1. idetape_issue_pc will send the packet command to the drive, and will set | |
625 | * the interrupt handler to ide_pc_intr. | |
626 | * | |
627 | * 2. On each interrupt, ide_pc_intr will be called. This step will be | |
628 | * repeated until the device signals us that no more interrupts will be issued. | |
629 | * | |
630 | * 3. ATAPI Tape media access commands have immediate status with a delayed | |
631 | * process. In case of a successful initiation of a media access packet command, | |
632 | * the DSC bit will be set when the actual execution of the command is finished. | |
633 | * Since the tape drive will not issue an interrupt, we have to poll for this | |
634 | * event. In this case, we define the request as "low priority request" by | |
635 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and | |
636 | * exit the driver. | |
637 | * | |
638 | * ide.c will then give higher priority to requests which originate from the | |
639 | * other device, until will change rq_status to RQ_ACTIVE. | |
640 | * | |
641 | * 4. When the packet command is finished, it will be checked for errors. | |
642 | * | |
643 | * 5. In case an error was found, we queue a request sense packet command in | |
644 | * front of the request queue and retry the operation up to | |
645 | * IDETAPE_MAX_PC_RETRIES times. | |
646 | * | |
647 | * 6. In case no error was found, or we decided to give up and not to retry | |
648 | * again, the callback function will be called and then we will handle the next | |
649 | * request. | |
650 | */ | |
651 | ||
652 | static ide_startstop_t idetape_issue_pc(ide_drive_t *drive, | |
653 | struct ide_atapi_pc *pc) | |
654 | { | |
655 | idetape_tape_t *tape = drive->driver_data; | |
656 | ||
657 | if (drive->pc->c[0] == REQUEST_SENSE && | |
658 | pc->c[0] == REQUEST_SENSE) { | |
659 | printk(KERN_ERR "ide-tape: possible ide-tape.c bug - " | |
660 | "Two request sense in serial were issued\n"); | |
661 | } | |
662 | ||
663 | if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) | |
664 | tape->failed_pc = pc; | |
665 | ||
666 | /* Set the current packet command */ | |
667 | drive->pc = pc; | |
668 | ||
669 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || | |
670 | (pc->flags & PC_FLAG_ABORT)) { | |
671 | /* | |
672 | * We will "abort" retrying a packet command in case legitimate | |
673 | * error code was received (crossing a filemark, or end of the | |
674 | * media, for example). | |
675 | */ | |
676 | if (!(pc->flags & PC_FLAG_ABORT)) { | |
677 | if (!(pc->c[0] == TEST_UNIT_READY && | |
678 | tape->sense_key == 2 && tape->asc == 4 && | |
679 | (tape->ascq == 1 || tape->ascq == 8))) { | |
680 | printk(KERN_ERR "ide-tape: %s: I/O error, " | |
681 | "pc = %2x, key = %2x, " | |
682 | "asc = %2x, ascq = %2x\n", | |
683 | tape->name, pc->c[0], | |
684 | tape->sense_key, tape->asc, | |
685 | tape->ascq); | |
686 | } | |
687 | /* Giving up */ | |
688 | pc->error = IDETAPE_ERROR_GENERAL; | |
689 | } | |
690 | tape->failed_pc = NULL; | |
691 | drive->pc_callback(drive, 0); | |
692 | return ide_stopped; | |
693 | } | |
694 | debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]); | |
695 | ||
696 | pc->retries++; | |
697 | ||
698 | return ide_issue_pc(drive); | |
699 | } | |
700 | ||
701 | /* A mode sense command is used to "sense" tape parameters. */ | |
702 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) | |
703 | { | |
704 | ide_init_pc(pc); | |
705 | pc->c[0] = MODE_SENSE; | |
706 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) | |
707 | /* DBD = 1 - Don't return block descriptors */ | |
708 | pc->c[1] = 8; | |
709 | pc->c[2] = page_code; | |
710 | /* | |
711 | * Changed pc->c[3] to 0 (255 will at best return unused info). | |
712 | * | |
713 | * For SCSI this byte is defined as subpage instead of high byte | |
714 | * of length and some IDE drives seem to interpret it this way | |
715 | * and return an error when 255 is used. | |
716 | */ | |
717 | pc->c[3] = 0; | |
718 | /* We will just discard data in that case */ | |
719 | pc->c[4] = 255; | |
720 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) | |
721 | pc->req_xfer = 12; | |
722 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) | |
723 | pc->req_xfer = 24; | |
724 | else | |
725 | pc->req_xfer = 50; | |
726 | } | |
727 | ||
728 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) | |
729 | { | |
730 | ide_hwif_t *hwif = drive->hwif; | |
731 | idetape_tape_t *tape = drive->driver_data; | |
732 | struct ide_atapi_pc *pc = drive->pc; | |
733 | u8 stat; | |
734 | ||
735 | stat = hwif->tp_ops->read_status(hwif); | |
736 | ||
737 | if (stat & ATA_DSC) { | |
738 | if (stat & ATA_ERR) { | |
739 | /* Error detected */ | |
740 | if (pc->c[0] != TEST_UNIT_READY) | |
741 | printk(KERN_ERR "ide-tape: %s: I/O error, ", | |
742 | tape->name); | |
743 | /* Retry operation */ | |
744 | ide_retry_pc(drive, tape->disk); | |
745 | return ide_stopped; | |
746 | } | |
747 | pc->error = 0; | |
748 | } else { | |
749 | pc->error = IDETAPE_ERROR_GENERAL; | |
750 | tape->failed_pc = NULL; | |
751 | } | |
752 | drive->pc_callback(drive, 0); | |
753 | return ide_stopped; | |
754 | } | |
755 | ||
756 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, | |
757 | struct ide_atapi_pc *pc, struct request *rq, | |
758 | u8 opcode) | |
759 | { | |
760 | struct idetape_bh *bh = (struct idetape_bh *)rq->special; | |
761 | unsigned int length = rq->current_nr_sectors; | |
762 | ||
763 | ide_init_pc(pc); | |
764 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); | |
765 | pc->c[1] = 1; | |
766 | pc->bh = bh; | |
767 | pc->buf = NULL; | |
768 | pc->buf_size = length * tape->blk_size; | |
769 | pc->req_xfer = pc->buf_size; | |
770 | if (pc->req_xfer == tape->buffer_size) | |
771 | pc->flags |= PC_FLAG_DMA_OK; | |
772 | ||
773 | if (opcode == READ_6) { | |
774 | pc->c[0] = READ_6; | |
775 | atomic_set(&bh->b_count, 0); | |
776 | } else if (opcode == WRITE_6) { | |
777 | pc->c[0] = WRITE_6; | |
778 | pc->flags |= PC_FLAG_WRITING; | |
779 | pc->b_data = bh->b_data; | |
780 | pc->b_count = atomic_read(&bh->b_count); | |
781 | } | |
782 | ||
783 | memcpy(rq->cmd, pc->c, 12); | |
784 | } | |
785 | ||
786 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, | |
787 | struct request *rq, sector_t block) | |
788 | { | |
789 | ide_hwif_t *hwif = drive->hwif; | |
790 | idetape_tape_t *tape = drive->driver_data; | |
791 | struct ide_atapi_pc *pc = NULL; | |
792 | struct request *postponed_rq = tape->postponed_rq; | |
793 | u8 stat; | |
794 | ||
795 | debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu," | |
796 | " current_nr_sectors: %u\n", | |
797 | (unsigned long long)rq->sector, rq->nr_sectors, | |
798 | rq->current_nr_sectors); | |
799 | ||
800 | if (!blk_special_request(rq)) { | |
801 | /* We do not support buffer cache originated requests. */ | |
802 | printk(KERN_NOTICE "ide-tape: %s: Unsupported request in " | |
803 | "request queue (%d)\n", drive->name, rq->cmd_type); | |
804 | ide_end_request(drive, 0, 0); | |
805 | return ide_stopped; | |
806 | } | |
807 | ||
808 | /* Retry a failed packet command */ | |
809 | if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { | |
810 | pc = tape->failed_pc; | |
811 | goto out; | |
812 | } | |
813 | ||
814 | if (postponed_rq != NULL) | |
815 | if (rq != postponed_rq) { | |
816 | printk(KERN_ERR "ide-tape: ide-tape.c bug - " | |
817 | "Two DSC requests were queued\n"); | |
818 | idetape_end_request(drive, 0, 0); | |
819 | return ide_stopped; | |
820 | } | |
821 | ||
822 | tape->postponed_rq = NULL; | |
823 | ||
824 | /* | |
825 | * If the tape is still busy, postpone our request and service | |
826 | * the other device meanwhile. | |
827 | */ | |
828 | stat = hwif->tp_ops->read_status(hwif); | |
829 | ||
830 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && | |
831 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) | |
832 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); | |
833 | ||
834 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { | |
835 | set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); | |
836 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; | |
837 | } | |
838 | ||
839 | if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) && | |
840 | (stat & ATA_DSC) == 0) { | |
841 | if (postponed_rq == NULL) { | |
842 | tape->dsc_polling_start = jiffies; | |
843 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; | |
844 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; | |
845 | } else if (time_after(jiffies, tape->dsc_timeout)) { | |
846 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", | |
847 | tape->name); | |
848 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { | |
849 | idetape_media_access_finished(drive); | |
850 | return ide_stopped; | |
851 | } else { | |
852 | return ide_do_reset(drive); | |
853 | } | |
854 | } else if (time_after(jiffies, | |
855 | tape->dsc_polling_start + | |
856 | IDETAPE_DSC_MA_THRESHOLD)) | |
857 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; | |
858 | idetape_postpone_request(drive); | |
859 | return ide_stopped; | |
860 | } | |
861 | if (rq->cmd[13] & REQ_IDETAPE_READ) { | |
862 | pc = &tape->queued_pc; | |
863 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); | |
864 | goto out; | |
865 | } | |
866 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { | |
867 | pc = &tape->queued_pc; | |
868 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); | |
869 | goto out; | |
870 | } | |
871 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { | |
872 | pc = (struct ide_atapi_pc *) rq->buffer; | |
873 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); | |
874 | rq->cmd[13] |= REQ_IDETAPE_PC2; | |
875 | goto out; | |
876 | } | |
877 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { | |
878 | idetape_media_access_finished(drive); | |
879 | return ide_stopped; | |
880 | } | |
881 | BUG(); | |
882 | ||
883 | out: | |
884 | return idetape_issue_pc(drive, pc); | |
885 | } | |
886 | ||
887 | /* | |
888 | * The function below uses __get_free_pages to allocate a data buffer of size | |
889 | * tape->buffer_size (or a bit more). We attempt to combine sequential pages as | |
890 | * much as possible. | |
891 | * | |
892 | * It returns a pointer to the newly allocated buffer, or NULL in case of | |
893 | * failure. | |
894 | */ | |
895 | static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape, | |
896 | int full, int clear) | |
897 | { | |
898 | struct idetape_bh *prev_bh, *bh, *merge_bh; | |
899 | int pages = tape->pages_per_buffer; | |
900 | unsigned int order, b_allocd; | |
901 | char *b_data = NULL; | |
902 | ||
903 | merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); | |
904 | bh = merge_bh; | |
905 | if (bh == NULL) | |
906 | goto abort; | |
907 | ||
908 | order = fls(pages) - 1; | |
909 | bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
910 | if (!bh->b_data) | |
911 | goto abort; | |
912 | b_allocd = (1 << order) * PAGE_SIZE; | |
913 | pages &= (order-1); | |
914 | ||
915 | if (clear) | |
916 | memset(bh->b_data, 0, b_allocd); | |
917 | bh->b_reqnext = NULL; | |
918 | bh->b_size = b_allocd; | |
919 | atomic_set(&bh->b_count, full ? bh->b_size : 0); | |
920 | ||
921 | while (pages) { | |
922 | order = fls(pages) - 1; | |
923 | b_data = (char *) __get_free_pages(GFP_KERNEL, order); | |
924 | if (!b_data) | |
925 | goto abort; | |
926 | b_allocd = (1 << order) * PAGE_SIZE; | |
927 | ||
928 | if (clear) | |
929 | memset(b_data, 0, b_allocd); | |
930 | ||
931 | /* newly allocated page frames below buffer header or ...*/ | |
932 | if (bh->b_data == b_data + b_allocd) { | |
933 | bh->b_size += b_allocd; | |
934 | bh->b_data -= b_allocd; | |
935 | if (full) | |
936 | atomic_add(b_allocd, &bh->b_count); | |
937 | continue; | |
938 | } | |
939 | /* they are above the header */ | |
940 | if (b_data == bh->b_data + bh->b_size) { | |
941 | bh->b_size += b_allocd; | |
942 | if (full) | |
943 | atomic_add(b_allocd, &bh->b_count); | |
944 | continue; | |
945 | } | |
946 | prev_bh = bh; | |
947 | bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL); | |
948 | if (!bh) { | |
949 | free_pages((unsigned long) b_data, order); | |
950 | goto abort; | |
951 | } | |
952 | bh->b_reqnext = NULL; | |
953 | bh->b_data = b_data; | |
954 | bh->b_size = b_allocd; | |
955 | atomic_set(&bh->b_count, full ? bh->b_size : 0); | |
956 | prev_bh->b_reqnext = bh; | |
957 | ||
958 | pages &= (order-1); | |
959 | } | |
960 | ||
961 | bh->b_size -= tape->excess_bh_size; | |
962 | if (full) | |
963 | atomic_sub(tape->excess_bh_size, &bh->b_count); | |
964 | return merge_bh; | |
965 | abort: | |
966 | ide_tape_kfree_buffer(tape); | |
967 | return NULL; | |
968 | } | |
969 | ||
970 | static int idetape_copy_stage_from_user(idetape_tape_t *tape, | |
971 | const char __user *buf, int n) | |
972 | { | |
973 | struct idetape_bh *bh = tape->bh; | |
974 | int count; | |
975 | int ret = 0; | |
976 | ||
977 | while (n) { | |
978 | if (bh == NULL) { | |
979 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", | |
980 | __func__); | |
981 | return 1; | |
982 | } | |
983 | count = min((unsigned int) | |
984 | (bh->b_size - atomic_read(&bh->b_count)), | |
985 | (unsigned int)n); | |
986 | if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, | |
987 | count)) | |
988 | ret = 1; | |
989 | n -= count; | |
990 | atomic_add(count, &bh->b_count); | |
991 | buf += count; | |
992 | if (atomic_read(&bh->b_count) == bh->b_size) { | |
993 | bh = bh->b_reqnext; | |
994 | if (bh) | |
995 | atomic_set(&bh->b_count, 0); | |
996 | } | |
997 | } | |
998 | tape->bh = bh; | |
999 | return ret; | |
1000 | } | |
1001 | ||
1002 | static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf, | |
1003 | int n) | |
1004 | { | |
1005 | struct idetape_bh *bh = tape->bh; | |
1006 | int count; | |
1007 | int ret = 0; | |
1008 | ||
1009 | while (n) { | |
1010 | if (bh == NULL) { | |
1011 | printk(KERN_ERR "ide-tape: bh == NULL in %s\n", | |
1012 | __func__); | |
1013 | return 1; | |
1014 | } | |
1015 | count = min(tape->b_count, n); | |
1016 | if (copy_to_user(buf, tape->b_data, count)) | |
1017 | ret = 1; | |
1018 | n -= count; | |
1019 | tape->b_data += count; | |
1020 | tape->b_count -= count; | |
1021 | buf += count; | |
1022 | if (!tape->b_count) { | |
1023 | bh = bh->b_reqnext; | |
1024 | tape->bh = bh; | |
1025 | if (bh) { | |
1026 | tape->b_data = bh->b_data; | |
1027 | tape->b_count = atomic_read(&bh->b_count); | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | return ret; | |
1032 | } | |
1033 | ||
1034 | static void idetape_init_merge_buffer(idetape_tape_t *tape) | |
1035 | { | |
1036 | struct idetape_bh *bh = tape->merge_bh; | |
1037 | tape->bh = tape->merge_bh; | |
1038 | ||
1039 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) | |
1040 | atomic_set(&bh->b_count, 0); | |
1041 | else { | |
1042 | tape->b_data = bh->b_data; | |
1043 | tape->b_count = atomic_read(&bh->b_count); | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Write a filemark if write_filemark=1. Flush the device buffers without | |
1049 | * writing a filemark otherwise. | |
1050 | */ | |
1051 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, | |
1052 | struct ide_atapi_pc *pc, int write_filemark) | |
1053 | { | |
1054 | ide_init_pc(pc); | |
1055 | pc->c[0] = WRITE_FILEMARKS; | |
1056 | pc->c[4] = write_filemark; | |
1057 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; | |
1058 | } | |
1059 | ||
1060 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) | |
1061 | { | |
1062 | idetape_tape_t *tape = drive->driver_data; | |
1063 | struct gendisk *disk = tape->disk; | |
1064 | int load_attempted = 0; | |
1065 | ||
1066 | /* Wait for the tape to become ready */ | |
1067 | set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); | |
1068 | timeout += jiffies; | |
1069 | while (time_before(jiffies, timeout)) { | |
1070 | if (ide_do_test_unit_ready(drive, disk) == 0) | |
1071 | return 0; | |
1072 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) | |
1073 | || (tape->asc == 0x3A)) { | |
1074 | /* no media */ | |
1075 | if (load_attempted) | |
1076 | return -ENOMEDIUM; | |
1077 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); | |
1078 | load_attempted = 1; | |
1079 | /* not about to be ready */ | |
1080 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && | |
1081 | (tape->ascq == 1 || tape->ascq == 8))) | |
1082 | return -EIO; | |
1083 | msleep(100); | |
1084 | } | |
1085 | return -EIO; | |
1086 | } | |
1087 | ||
1088 | static int idetape_flush_tape_buffers(ide_drive_t *drive) | |
1089 | { | |
1090 | struct ide_tape_obj *tape = drive->driver_data; | |
1091 | struct ide_atapi_pc pc; | |
1092 | int rc; | |
1093 | ||
1094 | idetape_create_write_filemark_cmd(drive, &pc, 0); | |
1095 | rc = ide_queue_pc_tail(drive, tape->disk, &pc); | |
1096 | if (rc) | |
1097 | return rc; | |
1098 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc) | |
1103 | { | |
1104 | ide_init_pc(pc); | |
1105 | pc->c[0] = READ_POSITION; | |
1106 | pc->req_xfer = 20; | |
1107 | } | |
1108 | ||
1109 | static int idetape_read_position(ide_drive_t *drive) | |
1110 | { | |
1111 | idetape_tape_t *tape = drive->driver_data; | |
1112 | struct ide_atapi_pc pc; | |
1113 | int position; | |
1114 | ||
1115 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
1116 | ||
1117 | idetape_create_read_position_cmd(&pc); | |
1118 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) | |
1119 | return -1; | |
1120 | position = tape->first_frame; | |
1121 | return position; | |
1122 | } | |
1123 | ||
1124 | static void idetape_create_locate_cmd(ide_drive_t *drive, | |
1125 | struct ide_atapi_pc *pc, | |
1126 | unsigned int block, u8 partition, int skip) | |
1127 | { | |
1128 | ide_init_pc(pc); | |
1129 | pc->c[0] = POSITION_TO_ELEMENT; | |
1130 | pc->c[1] = 2; | |
1131 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); | |
1132 | pc->c[8] = partition; | |
1133 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; | |
1134 | } | |
1135 | ||
1136 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) | |
1137 | { | |
1138 | idetape_tape_t *tape = drive->driver_data; | |
1139 | ||
1140 | if (tape->chrdev_dir != IDETAPE_DIR_READ) | |
1141 | return; | |
1142 | ||
1143 | clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags); | |
1144 | tape->merge_bh_size = 0; | |
1145 | if (tape->merge_bh != NULL) { | |
1146 | ide_tape_kfree_buffer(tape); | |
1147 | tape->merge_bh = NULL; | |
1148 | } | |
1149 | ||
1150 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Position the tape to the requested block using the LOCATE packet command. | |
1155 | * A READ POSITION command is then issued to check where we are positioned. Like | |
1156 | * all higher level operations, we queue the commands at the tail of the request | |
1157 | * queue and wait for their completion. | |
1158 | */ | |
1159 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, | |
1160 | u8 partition, int skip) | |
1161 | { | |
1162 | idetape_tape_t *tape = drive->driver_data; | |
1163 | struct gendisk *disk = tape->disk; | |
1164 | int retval; | |
1165 | struct ide_atapi_pc pc; | |
1166 | ||
1167 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
1168 | __ide_tape_discard_merge_buffer(drive); | |
1169 | idetape_wait_ready(drive, 60 * 5 * HZ); | |
1170 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); | |
1171 | retval = ide_queue_pc_tail(drive, disk, &pc); | |
1172 | if (retval) | |
1173 | return (retval); | |
1174 | ||
1175 | idetape_create_read_position_cmd(&pc); | |
1176 | return ide_queue_pc_tail(drive, disk, &pc); | |
1177 | } | |
1178 | ||
1179 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, | |
1180 | int restore_position) | |
1181 | { | |
1182 | idetape_tape_t *tape = drive->driver_data; | |
1183 | int seek, position; | |
1184 | ||
1185 | __ide_tape_discard_merge_buffer(drive); | |
1186 | if (restore_position) { | |
1187 | position = idetape_read_position(drive); | |
1188 | seek = position > 0 ? position : 0; | |
1189 | if (idetape_position_tape(drive, seek, 0, 0)) { | |
1190 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" | |
1191 | " %s\n", tape->name, __func__); | |
1192 | return; | |
1193 | } | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Generate a read/write request for the block device interface and wait for it | |
1199 | * to be serviced. | |
1200 | */ | |
1201 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, | |
1202 | struct idetape_bh *bh) | |
1203 | { | |
1204 | idetape_tape_t *tape = drive->driver_data; | |
1205 | struct request *rq; | |
1206 | int ret, errors; | |
1207 | ||
1208 | debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); | |
1209 | ||
1210 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); | |
1211 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
1212 | rq->cmd[13] = cmd; | |
1213 | rq->rq_disk = tape->disk; | |
1214 | rq->special = (void *)bh; | |
1215 | rq->sector = tape->first_frame; | |
1216 | rq->nr_sectors = blocks; | |
1217 | rq->current_nr_sectors = blocks; | |
1218 | blk_execute_rq(drive->queue, tape->disk, rq, 0); | |
1219 | ||
1220 | errors = rq->errors; | |
1221 | ret = tape->blk_size * (blocks - rq->current_nr_sectors); | |
1222 | blk_put_request(rq); | |
1223 | ||
1224 | if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0) | |
1225 | return 0; | |
1226 | ||
1227 | if (tape->merge_bh) | |
1228 | idetape_init_merge_buffer(tape); | |
1229 | if (errors == IDETAPE_ERROR_GENERAL) | |
1230 | return -EIO; | |
1231 | return ret; | |
1232 | } | |
1233 | ||
1234 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) | |
1235 | { | |
1236 | ide_init_pc(pc); | |
1237 | pc->c[0] = INQUIRY; | |
1238 | pc->c[4] = 254; | |
1239 | pc->req_xfer = 254; | |
1240 | } | |
1241 | ||
1242 | static void idetape_create_rewind_cmd(ide_drive_t *drive, | |
1243 | struct ide_atapi_pc *pc) | |
1244 | { | |
1245 | ide_init_pc(pc); | |
1246 | pc->c[0] = REZERO_UNIT; | |
1247 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; | |
1248 | } | |
1249 | ||
1250 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) | |
1251 | { | |
1252 | ide_init_pc(pc); | |
1253 | pc->c[0] = ERASE; | |
1254 | pc->c[1] = 1; | |
1255 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; | |
1256 | } | |
1257 | ||
1258 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) | |
1259 | { | |
1260 | ide_init_pc(pc); | |
1261 | pc->c[0] = SPACE; | |
1262 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); | |
1263 | pc->c[1] = cmd; | |
1264 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; | |
1265 | } | |
1266 | ||
1267 | /* Queue up a character device originated write request. */ | |
1268 | static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) | |
1269 | { | |
1270 | idetape_tape_t *tape = drive->driver_data; | |
1271 | ||
1272 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1273 | ||
1274 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, | |
1275 | blocks, tape->merge_bh); | |
1276 | } | |
1277 | ||
1278 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) | |
1279 | { | |
1280 | idetape_tape_t *tape = drive->driver_data; | |
1281 | int blocks, min; | |
1282 | struct idetape_bh *bh; | |
1283 | ||
1284 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { | |
1285 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" | |
1286 | " but we are not writing.\n"); | |
1287 | return; | |
1288 | } | |
1289 | if (tape->merge_bh_size > tape->buffer_size) { | |
1290 | printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n"); | |
1291 | tape->merge_bh_size = tape->buffer_size; | |
1292 | } | |
1293 | if (tape->merge_bh_size) { | |
1294 | blocks = tape->merge_bh_size / tape->blk_size; | |
1295 | if (tape->merge_bh_size % tape->blk_size) { | |
1296 | unsigned int i; | |
1297 | ||
1298 | blocks++; | |
1299 | i = tape->blk_size - tape->merge_bh_size % | |
1300 | tape->blk_size; | |
1301 | bh = tape->bh->b_reqnext; | |
1302 | while (bh) { | |
1303 | atomic_set(&bh->b_count, 0); | |
1304 | bh = bh->b_reqnext; | |
1305 | } | |
1306 | bh = tape->bh; | |
1307 | while (i) { | |
1308 | if (bh == NULL) { | |
1309 | printk(KERN_INFO "ide-tape: bug," | |
1310 | " bh NULL\n"); | |
1311 | break; | |
1312 | } | |
1313 | min = min(i, (unsigned int)(bh->b_size - | |
1314 | atomic_read(&bh->b_count))); | |
1315 | memset(bh->b_data + atomic_read(&bh->b_count), | |
1316 | 0, min); | |
1317 | atomic_add(min, &bh->b_count); | |
1318 | i -= min; | |
1319 | bh = bh->b_reqnext; | |
1320 | } | |
1321 | } | |
1322 | (void) idetape_add_chrdev_write_request(drive, blocks); | |
1323 | tape->merge_bh_size = 0; | |
1324 | } | |
1325 | if (tape->merge_bh != NULL) { | |
1326 | ide_tape_kfree_buffer(tape); | |
1327 | tape->merge_bh = NULL; | |
1328 | } | |
1329 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
1330 | } | |
1331 | ||
1332 | static int idetape_init_read(ide_drive_t *drive) | |
1333 | { | |
1334 | idetape_tape_t *tape = drive->driver_data; | |
1335 | int bytes_read; | |
1336 | ||
1337 | /* Initialize read operation */ | |
1338 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { | |
1339 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
1340 | ide_tape_flush_merge_buffer(drive); | |
1341 | idetape_flush_tape_buffers(drive); | |
1342 | } | |
1343 | if (tape->merge_bh || tape->merge_bh_size) { | |
1344 | printk(KERN_ERR "ide-tape: merge_bh_size should be" | |
1345 | " 0 now\n"); | |
1346 | tape->merge_bh_size = 0; | |
1347 | } | |
1348 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); | |
1349 | if (!tape->merge_bh) | |
1350 | return -ENOMEM; | |
1351 | tape->chrdev_dir = IDETAPE_DIR_READ; | |
1352 | ||
1353 | /* | |
1354 | * Issue a read 0 command to ensure that DSC handshake is | |
1355 | * switched from completion mode to buffer available mode. | |
1356 | * No point in issuing this if DSC overlap isn't supported, some | |
1357 | * drives (Seagate STT3401A) will return an error. | |
1358 | */ | |
1359 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { | |
1360 | bytes_read = idetape_queue_rw_tail(drive, | |
1361 | REQ_IDETAPE_READ, 0, | |
1362 | tape->merge_bh); | |
1363 | if (bytes_read < 0) { | |
1364 | ide_tape_kfree_buffer(tape); | |
1365 | tape->merge_bh = NULL; | |
1366 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
1367 | return bytes_read; | |
1368 | } | |
1369 | } | |
1370 | } | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | /* called from idetape_chrdev_read() to service a chrdev read request. */ | |
1376 | static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) | |
1377 | { | |
1378 | idetape_tape_t *tape = drive->driver_data; | |
1379 | ||
1380 | debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); | |
1381 | ||
1382 | /* If we are at a filemark, return a read length of 0 */ | |
1383 | if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) | |
1384 | return 0; | |
1385 | ||
1386 | idetape_init_read(drive); | |
1387 | ||
1388 | return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, | |
1389 | tape->merge_bh); | |
1390 | } | |
1391 | ||
1392 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) | |
1393 | { | |
1394 | idetape_tape_t *tape = drive->driver_data; | |
1395 | struct idetape_bh *bh; | |
1396 | int blocks; | |
1397 | ||
1398 | while (bcount) { | |
1399 | unsigned int count; | |
1400 | ||
1401 | bh = tape->merge_bh; | |
1402 | count = min(tape->buffer_size, bcount); | |
1403 | bcount -= count; | |
1404 | blocks = count / tape->blk_size; | |
1405 | while (count) { | |
1406 | atomic_set(&bh->b_count, | |
1407 | min(count, (unsigned int)bh->b_size)); | |
1408 | memset(bh->b_data, 0, atomic_read(&bh->b_count)); | |
1409 | count -= atomic_read(&bh->b_count); | |
1410 | bh = bh->b_reqnext; | |
1411 | } | |
1412 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, | |
1413 | tape->merge_bh); | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We | |
1419 | * currently support only one partition. | |
1420 | */ | |
1421 | static int idetape_rewind_tape(ide_drive_t *drive) | |
1422 | { | |
1423 | struct ide_tape_obj *tape = drive->driver_data; | |
1424 | struct gendisk *disk = tape->disk; | |
1425 | int retval; | |
1426 | struct ide_atapi_pc pc; | |
1427 | ||
1428 | debug_log(DBG_SENSE, "Enter %s\n", __func__); | |
1429 | ||
1430 | idetape_create_rewind_cmd(drive, &pc); | |
1431 | retval = ide_queue_pc_tail(drive, disk, &pc); | |
1432 | if (retval) | |
1433 | return retval; | |
1434 | ||
1435 | idetape_create_read_position_cmd(&pc); | |
1436 | retval = ide_queue_pc_tail(drive, disk, &pc); | |
1437 | if (retval) | |
1438 | return retval; | |
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | /* mtio.h compatible commands should be issued to the chrdev interface. */ | |
1443 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, | |
1444 | unsigned long arg) | |
1445 | { | |
1446 | idetape_tape_t *tape = drive->driver_data; | |
1447 | void __user *argp = (void __user *)arg; | |
1448 | ||
1449 | struct idetape_config { | |
1450 | int dsc_rw_frequency; | |
1451 | int dsc_media_access_frequency; | |
1452 | int nr_stages; | |
1453 | } config; | |
1454 | ||
1455 | debug_log(DBG_PROCS, "Enter %s\n", __func__); | |
1456 | ||
1457 | switch (cmd) { | |
1458 | case 0x0340: | |
1459 | if (copy_from_user(&config, argp, sizeof(config))) | |
1460 | return -EFAULT; | |
1461 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; | |
1462 | break; | |
1463 | case 0x0350: | |
1464 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; | |
1465 | config.nr_stages = 1; | |
1466 | if (copy_to_user(argp, &config, sizeof(config))) | |
1467 | return -EFAULT; | |
1468 | break; | |
1469 | default: | |
1470 | return -EIO; | |
1471 | } | |
1472 | return 0; | |
1473 | } | |
1474 | ||
1475 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, | |
1476 | int mt_count) | |
1477 | { | |
1478 | idetape_tape_t *tape = drive->driver_data; | |
1479 | struct gendisk *disk = tape->disk; | |
1480 | struct ide_atapi_pc pc; | |
1481 | int retval, count = 0; | |
1482 | int sprev = !!(tape->caps[4] & 0x20); | |
1483 | ||
1484 | if (mt_count == 0) | |
1485 | return 0; | |
1486 | if (MTBSF == mt_op || MTBSFM == mt_op) { | |
1487 | if (!sprev) | |
1488 | return -EIO; | |
1489 | mt_count = -mt_count; | |
1490 | } | |
1491 | ||
1492 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { | |
1493 | tape->merge_bh_size = 0; | |
1494 | if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) | |
1495 | ++count; | |
1496 | ide_tape_discard_merge_buffer(drive, 0); | |
1497 | } | |
1498 | ||
1499 | switch (mt_op) { | |
1500 | case MTFSF: | |
1501 | case MTBSF: | |
1502 | idetape_create_space_cmd(&pc, mt_count - count, | |
1503 | IDETAPE_SPACE_OVER_FILEMARK); | |
1504 | return ide_queue_pc_tail(drive, disk, &pc); | |
1505 | case MTFSFM: | |
1506 | case MTBSFM: | |
1507 | if (!sprev) | |
1508 | return -EIO; | |
1509 | retval = idetape_space_over_filemarks(drive, MTFSF, | |
1510 | mt_count - count); | |
1511 | if (retval) | |
1512 | return retval; | |
1513 | count = (MTBSFM == mt_op ? 1 : -1); | |
1514 | return idetape_space_over_filemarks(drive, MTFSF, count); | |
1515 | default: | |
1516 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1517 | mt_op); | |
1518 | return -EIO; | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * Our character device read / write functions. | |
1524 | * | |
1525 | * The tape is optimized to maximize throughput when it is transferring an | |
1526 | * integral number of the "continuous transfer limit", which is a parameter of | |
1527 | * the specific tape (26kB on my particular tape, 32kB for Onstream). | |
1528 | * | |
1529 | * As of version 1.3 of the driver, the character device provides an abstract | |
1530 | * continuous view of the media - any mix of block sizes (even 1 byte) on the | |
1531 | * same backup/restore procedure is supported. The driver will internally | |
1532 | * convert the requests to the recommended transfer unit, so that an unmatch | |
1533 | * between the user's block size to the recommended size will only result in a | |
1534 | * (slightly) increased driver overhead, but will no longer hit performance. | |
1535 | * This is not applicable to Onstream. | |
1536 | */ | |
1537 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, | |
1538 | size_t count, loff_t *ppos) | |
1539 | { | |
1540 | struct ide_tape_obj *tape = file->private_data; | |
1541 | ide_drive_t *drive = tape->drive; | |
1542 | ssize_t bytes_read, temp, actually_read = 0, rc; | |
1543 | ssize_t ret = 0; | |
1544 | u16 ctl = *(u16 *)&tape->caps[12]; | |
1545 | ||
1546 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); | |
1547 | ||
1548 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { | |
1549 | if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags)) | |
1550 | if (count > tape->blk_size && | |
1551 | (count % tape->blk_size) == 0) | |
1552 | tape->user_bs_factor = count / tape->blk_size; | |
1553 | } | |
1554 | rc = idetape_init_read(drive); | |
1555 | if (rc < 0) | |
1556 | return rc; | |
1557 | if (count == 0) | |
1558 | return (0); | |
1559 | if (tape->merge_bh_size) { | |
1560 | actually_read = min((unsigned int)(tape->merge_bh_size), | |
1561 | (unsigned int)count); | |
1562 | if (idetape_copy_stage_to_user(tape, buf, actually_read)) | |
1563 | ret = -EFAULT; | |
1564 | buf += actually_read; | |
1565 | tape->merge_bh_size -= actually_read; | |
1566 | count -= actually_read; | |
1567 | } | |
1568 | while (count >= tape->buffer_size) { | |
1569 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); | |
1570 | if (bytes_read <= 0) | |
1571 | goto finish; | |
1572 | if (idetape_copy_stage_to_user(tape, buf, bytes_read)) | |
1573 | ret = -EFAULT; | |
1574 | buf += bytes_read; | |
1575 | count -= bytes_read; | |
1576 | actually_read += bytes_read; | |
1577 | } | |
1578 | if (count) { | |
1579 | bytes_read = idetape_add_chrdev_read_request(drive, ctl); | |
1580 | if (bytes_read <= 0) | |
1581 | goto finish; | |
1582 | temp = min((unsigned long)count, (unsigned long)bytes_read); | |
1583 | if (idetape_copy_stage_to_user(tape, buf, temp)) | |
1584 | ret = -EFAULT; | |
1585 | actually_read += temp; | |
1586 | tape->merge_bh_size = bytes_read-temp; | |
1587 | } | |
1588 | finish: | |
1589 | if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) { | |
1590 | debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name); | |
1591 | ||
1592 | idetape_space_over_filemarks(drive, MTFSF, 1); | |
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | return ret ? ret : actually_read; | |
1597 | } | |
1598 | ||
1599 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, | |
1600 | size_t count, loff_t *ppos) | |
1601 | { | |
1602 | struct ide_tape_obj *tape = file->private_data; | |
1603 | ide_drive_t *drive = tape->drive; | |
1604 | ssize_t actually_written = 0; | |
1605 | ssize_t ret = 0; | |
1606 | u16 ctl = *(u16 *)&tape->caps[12]; | |
1607 | ||
1608 | /* The drive is write protected. */ | |
1609 | if (tape->write_prot) | |
1610 | return -EACCES; | |
1611 | ||
1612 | debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); | |
1613 | ||
1614 | /* Initialize write operation */ | |
1615 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { | |
1616 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
1617 | ide_tape_discard_merge_buffer(drive, 1); | |
1618 | if (tape->merge_bh || tape->merge_bh_size) { | |
1619 | printk(KERN_ERR "ide-tape: merge_bh_size " | |
1620 | "should be 0 now\n"); | |
1621 | tape->merge_bh_size = 0; | |
1622 | } | |
1623 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0); | |
1624 | if (!tape->merge_bh) | |
1625 | return -ENOMEM; | |
1626 | tape->chrdev_dir = IDETAPE_DIR_WRITE; | |
1627 | idetape_init_merge_buffer(tape); | |
1628 | ||
1629 | /* | |
1630 | * Issue a write 0 command to ensure that DSC handshake is | |
1631 | * switched from completion mode to buffer available mode. No | |
1632 | * point in issuing this if DSC overlap isn't supported, some | |
1633 | * drives (Seagate STT3401A) will return an error. | |
1634 | */ | |
1635 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { | |
1636 | ssize_t retval = idetape_queue_rw_tail(drive, | |
1637 | REQ_IDETAPE_WRITE, 0, | |
1638 | tape->merge_bh); | |
1639 | if (retval < 0) { | |
1640 | ide_tape_kfree_buffer(tape); | |
1641 | tape->merge_bh = NULL; | |
1642 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
1643 | return retval; | |
1644 | } | |
1645 | } | |
1646 | } | |
1647 | if (count == 0) | |
1648 | return (0); | |
1649 | if (tape->merge_bh_size) { | |
1650 | if (tape->merge_bh_size >= tape->buffer_size) { | |
1651 | printk(KERN_ERR "ide-tape: bug: merge buf too big\n"); | |
1652 | tape->merge_bh_size = 0; | |
1653 | } | |
1654 | actually_written = min((unsigned int) | |
1655 | (tape->buffer_size - tape->merge_bh_size), | |
1656 | (unsigned int)count); | |
1657 | if (idetape_copy_stage_from_user(tape, buf, actually_written)) | |
1658 | ret = -EFAULT; | |
1659 | buf += actually_written; | |
1660 | tape->merge_bh_size += actually_written; | |
1661 | count -= actually_written; | |
1662 | ||
1663 | if (tape->merge_bh_size == tape->buffer_size) { | |
1664 | ssize_t retval; | |
1665 | tape->merge_bh_size = 0; | |
1666 | retval = idetape_add_chrdev_write_request(drive, ctl); | |
1667 | if (retval <= 0) | |
1668 | return (retval); | |
1669 | } | |
1670 | } | |
1671 | while (count >= tape->buffer_size) { | |
1672 | ssize_t retval; | |
1673 | if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size)) | |
1674 | ret = -EFAULT; | |
1675 | buf += tape->buffer_size; | |
1676 | count -= tape->buffer_size; | |
1677 | retval = idetape_add_chrdev_write_request(drive, ctl); | |
1678 | actually_written += tape->buffer_size; | |
1679 | if (retval <= 0) | |
1680 | return (retval); | |
1681 | } | |
1682 | if (count) { | |
1683 | actually_written += count; | |
1684 | if (idetape_copy_stage_from_user(tape, buf, count)) | |
1685 | ret = -EFAULT; | |
1686 | tape->merge_bh_size += count; | |
1687 | } | |
1688 | return ret ? ret : actually_written; | |
1689 | } | |
1690 | ||
1691 | static int idetape_write_filemark(ide_drive_t *drive) | |
1692 | { | |
1693 | struct ide_tape_obj *tape = drive->driver_data; | |
1694 | struct ide_atapi_pc pc; | |
1695 | ||
1696 | /* Write a filemark */ | |
1697 | idetape_create_write_filemark_cmd(drive, &pc, 1); | |
1698 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { | |
1699 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); | |
1700 | return -EIO; | |
1701 | } | |
1702 | return 0; | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is | |
1707 | * requested. | |
1708 | * | |
1709 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support | |
1710 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also | |
1711 | * usually not supported. | |
1712 | * | |
1713 | * The following commands are currently not supported: | |
1714 | * | |
1715 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, | |
1716 | * MT_ST_WRITE_THRESHOLD. | |
1717 | */ | |
1718 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) | |
1719 | { | |
1720 | idetape_tape_t *tape = drive->driver_data; | |
1721 | struct gendisk *disk = tape->disk; | |
1722 | struct ide_atapi_pc pc; | |
1723 | int i, retval; | |
1724 | ||
1725 | debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n", | |
1726 | mt_op, mt_count); | |
1727 | ||
1728 | switch (mt_op) { | |
1729 | case MTFSF: | |
1730 | case MTFSFM: | |
1731 | case MTBSF: | |
1732 | case MTBSFM: | |
1733 | if (!mt_count) | |
1734 | return 0; | |
1735 | return idetape_space_over_filemarks(drive, mt_op, mt_count); | |
1736 | default: | |
1737 | break; | |
1738 | } | |
1739 | ||
1740 | switch (mt_op) { | |
1741 | case MTWEOF: | |
1742 | if (tape->write_prot) | |
1743 | return -EACCES; | |
1744 | ide_tape_discard_merge_buffer(drive, 1); | |
1745 | for (i = 0; i < mt_count; i++) { | |
1746 | retval = idetape_write_filemark(drive); | |
1747 | if (retval) | |
1748 | return retval; | |
1749 | } | |
1750 | return 0; | |
1751 | case MTREW: | |
1752 | ide_tape_discard_merge_buffer(drive, 0); | |
1753 | if (idetape_rewind_tape(drive)) | |
1754 | return -EIO; | |
1755 | return 0; | |
1756 | case MTLOAD: | |
1757 | ide_tape_discard_merge_buffer(drive, 0); | |
1758 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); | |
1759 | case MTUNLOAD: | |
1760 | case MTOFFL: | |
1761 | /* | |
1762 | * If door is locked, attempt to unlock before | |
1763 | * attempting to eject. | |
1764 | */ | |
1765 | if (tape->door_locked) { | |
1766 | if (!ide_set_media_lock(drive, disk, 0)) | |
1767 | tape->door_locked = DOOR_UNLOCKED; | |
1768 | } | |
1769 | ide_tape_discard_merge_buffer(drive, 0); | |
1770 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); | |
1771 | if (!retval) | |
1772 | clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags); | |
1773 | return retval; | |
1774 | case MTNOP: | |
1775 | ide_tape_discard_merge_buffer(drive, 0); | |
1776 | return idetape_flush_tape_buffers(drive); | |
1777 | case MTRETEN: | |
1778 | ide_tape_discard_merge_buffer(drive, 0); | |
1779 | return ide_do_start_stop(drive, disk, | |
1780 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); | |
1781 | case MTEOM: | |
1782 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); | |
1783 | return ide_queue_pc_tail(drive, disk, &pc); | |
1784 | case MTERASE: | |
1785 | (void)idetape_rewind_tape(drive); | |
1786 | idetape_create_erase_cmd(&pc); | |
1787 | return ide_queue_pc_tail(drive, disk, &pc); | |
1788 | case MTSETBLK: | |
1789 | if (mt_count) { | |
1790 | if (mt_count < tape->blk_size || | |
1791 | mt_count % tape->blk_size) | |
1792 | return -EIO; | |
1793 | tape->user_bs_factor = mt_count / tape->blk_size; | |
1794 | clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); | |
1795 | } else | |
1796 | set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags); | |
1797 | return 0; | |
1798 | case MTSEEK: | |
1799 | ide_tape_discard_merge_buffer(drive, 0); | |
1800 | return idetape_position_tape(drive, | |
1801 | mt_count * tape->user_bs_factor, tape->partition, 0); | |
1802 | case MTSETPART: | |
1803 | ide_tape_discard_merge_buffer(drive, 0); | |
1804 | return idetape_position_tape(drive, 0, mt_count, 0); | |
1805 | case MTFSR: | |
1806 | case MTBSR: | |
1807 | case MTLOCK: | |
1808 | retval = ide_set_media_lock(drive, disk, 1); | |
1809 | if (retval) | |
1810 | return retval; | |
1811 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; | |
1812 | return 0; | |
1813 | case MTUNLOCK: | |
1814 | retval = ide_set_media_lock(drive, disk, 0); | |
1815 | if (retval) | |
1816 | return retval; | |
1817 | tape->door_locked = DOOR_UNLOCKED; | |
1818 | return 0; | |
1819 | default: | |
1820 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", | |
1821 | mt_op); | |
1822 | return -EIO; | |
1823 | } | |
1824 | } | |
1825 | ||
1826 | /* | |
1827 | * Our character device ioctls. General mtio.h magnetic io commands are | |
1828 | * supported here, and not in the corresponding block interface. Our own | |
1829 | * ide-tape ioctls are supported on both interfaces. | |
1830 | */ | |
1831 | static int idetape_chrdev_ioctl(struct inode *inode, struct file *file, | |
1832 | unsigned int cmd, unsigned long arg) | |
1833 | { | |
1834 | struct ide_tape_obj *tape = file->private_data; | |
1835 | ide_drive_t *drive = tape->drive; | |
1836 | struct mtop mtop; | |
1837 | struct mtget mtget; | |
1838 | struct mtpos mtpos; | |
1839 | int block_offset = 0, position = tape->first_frame; | |
1840 | void __user *argp = (void __user *)arg; | |
1841 | ||
1842 | debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd); | |
1843 | ||
1844 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { | |
1845 | ide_tape_flush_merge_buffer(drive); | |
1846 | idetape_flush_tape_buffers(drive); | |
1847 | } | |
1848 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { | |
1849 | block_offset = tape->merge_bh_size / | |
1850 | (tape->blk_size * tape->user_bs_factor); | |
1851 | position = idetape_read_position(drive); | |
1852 | if (position < 0) | |
1853 | return -EIO; | |
1854 | } | |
1855 | switch (cmd) { | |
1856 | case MTIOCTOP: | |
1857 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) | |
1858 | return -EFAULT; | |
1859 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); | |
1860 | case MTIOCGET: | |
1861 | memset(&mtget, 0, sizeof(struct mtget)); | |
1862 | mtget.mt_type = MT_ISSCSI2; | |
1863 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1864 | mtget.mt_dsreg = | |
1865 | ((tape->blk_size * tape->user_bs_factor) | |
1866 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; | |
1867 | ||
1868 | if (tape->drv_write_prot) | |
1869 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); | |
1870 | ||
1871 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) | |
1872 | return -EFAULT; | |
1873 | return 0; | |
1874 | case MTIOCPOS: | |
1875 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; | |
1876 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) | |
1877 | return -EFAULT; | |
1878 | return 0; | |
1879 | default: | |
1880 | if (tape->chrdev_dir == IDETAPE_DIR_READ) | |
1881 | ide_tape_discard_merge_buffer(drive, 1); | |
1882 | return idetape_blkdev_ioctl(drive, cmd, arg); | |
1883 | } | |
1884 | } | |
1885 | ||
1886 | /* | |
1887 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape | |
1888 | * block size with the reported value. | |
1889 | */ | |
1890 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) | |
1891 | { | |
1892 | idetape_tape_t *tape = drive->driver_data; | |
1893 | struct ide_atapi_pc pc; | |
1894 | ||
1895 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); | |
1896 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { | |
1897 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); | |
1898 | if (tape->blk_size == 0) { | |
1899 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " | |
1900 | "block size, assuming 32k\n"); | |
1901 | tape->blk_size = 32768; | |
1902 | } | |
1903 | return; | |
1904 | } | |
1905 | tape->blk_size = (pc.buf[4 + 5] << 16) + | |
1906 | (pc.buf[4 + 6] << 8) + | |
1907 | pc.buf[4 + 7]; | |
1908 | tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7; | |
1909 | } | |
1910 | ||
1911 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) | |
1912 | { | |
1913 | unsigned int minor = iminor(inode), i = minor & ~0xc0; | |
1914 | ide_drive_t *drive; | |
1915 | idetape_tape_t *tape; | |
1916 | int retval; | |
1917 | ||
1918 | if (i >= MAX_HWIFS * MAX_DRIVES) | |
1919 | return -ENXIO; | |
1920 | ||
1921 | lock_kernel(); | |
1922 | tape = ide_tape_chrdev_get(i); | |
1923 | if (!tape) { | |
1924 | unlock_kernel(); | |
1925 | return -ENXIO; | |
1926 | } | |
1927 | ||
1928 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
1929 | ||
1930 | /* | |
1931 | * We really want to do nonseekable_open(inode, filp); here, but some | |
1932 | * versions of tar incorrectly call lseek on tapes and bail out if that | |
1933 | * fails. So we disallow pread() and pwrite(), but permit lseeks. | |
1934 | */ | |
1935 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); | |
1936 | ||
1937 | drive = tape->drive; | |
1938 | ||
1939 | filp->private_data = tape; | |
1940 | ||
1941 | if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) { | |
1942 | retval = -EBUSY; | |
1943 | goto out_put_tape; | |
1944 | } | |
1945 | ||
1946 | retval = idetape_wait_ready(drive, 60 * HZ); | |
1947 | if (retval) { | |
1948 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); | |
1949 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); | |
1950 | goto out_put_tape; | |
1951 | } | |
1952 | ||
1953 | idetape_read_position(drive); | |
1954 | if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags)) | |
1955 | (void)idetape_rewind_tape(drive); | |
1956 | ||
1957 | /* Read block size and write protect status from drive. */ | |
1958 | ide_tape_get_bsize_from_bdesc(drive); | |
1959 | ||
1960 | /* Set write protect flag if device is opened as read-only. */ | |
1961 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) | |
1962 | tape->write_prot = 1; | |
1963 | else | |
1964 | tape->write_prot = tape->drv_write_prot; | |
1965 | ||
1966 | /* Make sure drive isn't write protected if user wants to write. */ | |
1967 | if (tape->write_prot) { | |
1968 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || | |
1969 | (filp->f_flags & O_ACCMODE) == O_RDWR) { | |
1970 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); | |
1971 | retval = -EROFS; | |
1972 | goto out_put_tape; | |
1973 | } | |
1974 | } | |
1975 | ||
1976 | /* Lock the tape drive door so user can't eject. */ | |
1977 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { | |
1978 | if (!ide_set_media_lock(drive, tape->disk, 1)) { | |
1979 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) | |
1980 | tape->door_locked = DOOR_LOCKED; | |
1981 | } | |
1982 | } | |
1983 | unlock_kernel(); | |
1984 | return 0; | |
1985 | ||
1986 | out_put_tape: | |
1987 | ide_tape_put(tape); | |
1988 | unlock_kernel(); | |
1989 | return retval; | |
1990 | } | |
1991 | ||
1992 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) | |
1993 | { | |
1994 | idetape_tape_t *tape = drive->driver_data; | |
1995 | ||
1996 | ide_tape_flush_merge_buffer(drive); | |
1997 | tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0); | |
1998 | if (tape->merge_bh != NULL) { | |
1999 | idetape_pad_zeros(drive, tape->blk_size * | |
2000 | (tape->user_bs_factor - 1)); | |
2001 | ide_tape_kfree_buffer(tape); | |
2002 | tape->merge_bh = NULL; | |
2003 | } | |
2004 | idetape_write_filemark(drive); | |
2005 | idetape_flush_tape_buffers(drive); | |
2006 | idetape_flush_tape_buffers(drive); | |
2007 | } | |
2008 | ||
2009 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) | |
2010 | { | |
2011 | struct ide_tape_obj *tape = filp->private_data; | |
2012 | ide_drive_t *drive = tape->drive; | |
2013 | unsigned int minor = iminor(inode); | |
2014 | ||
2015 | lock_kernel(); | |
2016 | tape = drive->driver_data; | |
2017 | ||
2018 | debug_log(DBG_CHRDEV, "Enter %s\n", __func__); | |
2019 | ||
2020 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) | |
2021 | idetape_write_release(drive, minor); | |
2022 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { | |
2023 | if (minor < 128) | |
2024 | ide_tape_discard_merge_buffer(drive, 1); | |
2025 | } | |
2026 | ||
2027 | if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags)) | |
2028 | (void) idetape_rewind_tape(drive); | |
2029 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { | |
2030 | if (tape->door_locked == DOOR_LOCKED) { | |
2031 | if (!ide_set_media_lock(drive, tape->disk, 0)) | |
2032 | tape->door_locked = DOOR_UNLOCKED; | |
2033 | } | |
2034 | } | |
2035 | clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags); | |
2036 | ide_tape_put(tape); | |
2037 | unlock_kernel(); | |
2038 | return 0; | |
2039 | } | |
2040 | ||
2041 | static void idetape_get_inquiry_results(ide_drive_t *drive) | |
2042 | { | |
2043 | idetape_tape_t *tape = drive->driver_data; | |
2044 | struct ide_atapi_pc pc; | |
2045 | char fw_rev[4], vendor_id[8], product_id[16]; | |
2046 | ||
2047 | idetape_create_inquiry_cmd(&pc); | |
2048 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { | |
2049 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", | |
2050 | tape->name); | |
2051 | return; | |
2052 | } | |
2053 | memcpy(vendor_id, &pc.buf[8], 8); | |
2054 | memcpy(product_id, &pc.buf[16], 16); | |
2055 | memcpy(fw_rev, &pc.buf[32], 4); | |
2056 | ||
2057 | ide_fixstring(vendor_id, 8, 0); | |
2058 | ide_fixstring(product_id, 16, 0); | |
2059 | ide_fixstring(fw_rev, 4, 0); | |
2060 | ||
2061 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", | |
2062 | drive->name, tape->name, vendor_id, product_id, fw_rev); | |
2063 | } | |
2064 | ||
2065 | /* | |
2066 | * Ask the tape about its various parameters. In particular, we will adjust our | |
2067 | * data transfer buffer size to the recommended value as returned by the tape. | |
2068 | */ | |
2069 | static void idetape_get_mode_sense_results(ide_drive_t *drive) | |
2070 | { | |
2071 | idetape_tape_t *tape = drive->driver_data; | |
2072 | struct ide_atapi_pc pc; | |
2073 | u8 *caps; | |
2074 | u8 speed, max_speed; | |
2075 | ||
2076 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); | |
2077 | if (ide_queue_pc_tail(drive, tape->disk, &pc)) { | |
2078 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" | |
2079 | " some default values\n"); | |
2080 | tape->blk_size = 512; | |
2081 | put_unaligned(52, (u16 *)&tape->caps[12]); | |
2082 | put_unaligned(540, (u16 *)&tape->caps[14]); | |
2083 | put_unaligned(6*52, (u16 *)&tape->caps[16]); | |
2084 | return; | |
2085 | } | |
2086 | caps = pc.buf + 4 + pc.buf[3]; | |
2087 | ||
2088 | /* convert to host order and save for later use */ | |
2089 | speed = be16_to_cpup((__be16 *)&caps[14]); | |
2090 | max_speed = be16_to_cpup((__be16 *)&caps[8]); | |
2091 | ||
2092 | *(u16 *)&caps[8] = max_speed; | |
2093 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); | |
2094 | *(u16 *)&caps[14] = speed; | |
2095 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); | |
2096 | ||
2097 | if (!speed) { | |
2098 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " | |
2099 | "(assuming 650KB/sec)\n", drive->name); | |
2100 | *(u16 *)&caps[14] = 650; | |
2101 | } | |
2102 | if (!max_speed) { | |
2103 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " | |
2104 | "(assuming 650KB/sec)\n", drive->name); | |
2105 | *(u16 *)&caps[8] = 650; | |
2106 | } | |
2107 | ||
2108 | memcpy(&tape->caps, caps, 20); | |
2109 | ||
2110 | /* device lacks locking support according to capabilities page */ | |
2111 | if ((caps[6] & 1) == 0) | |
2112 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; | |
2113 | ||
2114 | if (caps[7] & 0x02) | |
2115 | tape->blk_size = 512; | |
2116 | else if (caps[7] & 0x04) | |
2117 | tape->blk_size = 1024; | |
2118 | } | |
2119 | ||
2120 | #ifdef CONFIG_IDE_PROC_FS | |
2121 | #define ide_tape_devset_get(name, field) \ | |
2122 | static int get_##name(ide_drive_t *drive) \ | |
2123 | { \ | |
2124 | idetape_tape_t *tape = drive->driver_data; \ | |
2125 | return tape->field; \ | |
2126 | } | |
2127 | ||
2128 | #define ide_tape_devset_set(name, field) \ | |
2129 | static int set_##name(ide_drive_t *drive, int arg) \ | |
2130 | { \ | |
2131 | idetape_tape_t *tape = drive->driver_data; \ | |
2132 | tape->field = arg; \ | |
2133 | return 0; \ | |
2134 | } | |
2135 | ||
2136 | #define ide_tape_devset_rw_field(_name, _field) \ | |
2137 | ide_tape_devset_get(_name, _field) \ | |
2138 | ide_tape_devset_set(_name, _field) \ | |
2139 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) | |
2140 | ||
2141 | #define ide_tape_devset_r_field(_name, _field) \ | |
2142 | ide_tape_devset_get(_name, _field) \ | |
2143 | IDE_DEVSET(_name, 0, get_##_name, NULL) | |
2144 | ||
2145 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } | |
2146 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } | |
2147 | static int divf_buffer(ide_drive_t *drive) { return 2; } | |
2148 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } | |
2149 | ||
2150 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); | |
2151 | ||
2152 | ide_tape_devset_rw_field(debug_mask, debug_mask); | |
2153 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); | |
2154 | ||
2155 | ide_tape_devset_r_field(avg_speed, avg_speed); | |
2156 | ide_tape_devset_r_field(speed, caps[14]); | |
2157 | ide_tape_devset_r_field(buffer, caps[16]); | |
2158 | ide_tape_devset_r_field(buffer_size, buffer_size); | |
2159 | ||
2160 | static const struct ide_proc_devset idetape_settings[] = { | |
2161 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), | |
2162 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), | |
2163 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), | |
2164 | __IDE_PROC_DEVSET(debug_mask, 0, 0xffff, NULL, NULL), | |
2165 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), | |
2166 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), | |
2167 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, | |
2168 | mulf_tdsc, divf_tdsc), | |
2169 | { 0 }, | |
2170 | }; | |
2171 | #endif | |
2172 | ||
2173 | /* | |
2174 | * The function below is called to: | |
2175 | * | |
2176 | * 1. Initialize our various state variables. | |
2177 | * 2. Ask the tape for its capabilities. | |
2178 | * 3. Allocate a buffer which will be used for data transfer. The buffer size | |
2179 | * is chosen based on the recommendation which we received in step 2. | |
2180 | * | |
2181 | * Note that at this point ide.c already assigned us an irq, so that we can | |
2182 | * queue requests here and wait for their completion. | |
2183 | */ | |
2184 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) | |
2185 | { | |
2186 | unsigned long t; | |
2187 | int speed; | |
2188 | int buffer_size; | |
2189 | u16 *ctl = (u16 *)&tape->caps[12]; | |
2190 | ||
2191 | drive->pc_callback = ide_tape_callback; | |
2192 | drive->pc_update_buffers = idetape_update_buffers; | |
2193 | drive->pc_io_buffers = ide_tape_io_buffers; | |
2194 | ||
2195 | spin_lock_init(&tape->lock); | |
2196 | ||
2197 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; | |
2198 | ||
2199 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { | |
2200 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", | |
2201 | tape->name); | |
2202 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; | |
2203 | } | |
2204 | ||
2205 | /* Seagate Travan drives do not support DSC overlap. */ | |
2206 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) | |
2207 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; | |
2208 | ||
2209 | tape->minor = minor; | |
2210 | tape->name[0] = 'h'; | |
2211 | tape->name[1] = 't'; | |
2212 | tape->name[2] = '0' + minor; | |
2213 | tape->chrdev_dir = IDETAPE_DIR_NONE; | |
2214 | ||
2215 | idetape_get_inquiry_results(drive); | |
2216 | idetape_get_mode_sense_results(drive); | |
2217 | ide_tape_get_bsize_from_bdesc(drive); | |
2218 | tape->user_bs_factor = 1; | |
2219 | tape->buffer_size = *ctl * tape->blk_size; | |
2220 | while (tape->buffer_size > 0xffff) { | |
2221 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); | |
2222 | *ctl /= 2; | |
2223 | tape->buffer_size = *ctl * tape->blk_size; | |
2224 | } | |
2225 | buffer_size = tape->buffer_size; | |
2226 | tape->pages_per_buffer = buffer_size / PAGE_SIZE; | |
2227 | if (buffer_size % PAGE_SIZE) { | |
2228 | tape->pages_per_buffer++; | |
2229 | tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE; | |
2230 | } | |
2231 | ||
2232 | /* select the "best" DSC read/write polling freq */ | |
2233 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); | |
2234 | ||
2235 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); | |
2236 | ||
2237 | /* | |
2238 | * Ensure that the number we got makes sense; limit it within | |
2239 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. | |
2240 | */ | |
2241 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, | |
2242 | IDETAPE_DSC_RW_MAX); | |
2243 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " | |
2244 | "%lums tDSC%s\n", | |
2245 | drive->name, tape->name, *(u16 *)&tape->caps[14], | |
2246 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, | |
2247 | tape->buffer_size / 1024, | |
2248 | tape->best_dsc_rw_freq * 1000 / HZ, | |
2249 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); | |
2250 | ||
2251 | ide_proc_register_driver(drive, tape->driver); | |
2252 | } | |
2253 | ||
2254 | static void ide_tape_remove(ide_drive_t *drive) | |
2255 | { | |
2256 | idetape_tape_t *tape = drive->driver_data; | |
2257 | ||
2258 | ide_proc_unregister_driver(drive, tape->driver); | |
2259 | device_del(&tape->dev); | |
2260 | ide_unregister_region(tape->disk); | |
2261 | ||
2262 | mutex_lock(&idetape_ref_mutex); | |
2263 | put_device(&tape->dev); | |
2264 | mutex_unlock(&idetape_ref_mutex); | |
2265 | } | |
2266 | ||
2267 | static void ide_tape_release(struct device *dev) | |
2268 | { | |
2269 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); | |
2270 | ide_drive_t *drive = tape->drive; | |
2271 | struct gendisk *g = tape->disk; | |
2272 | ||
2273 | BUG_ON(tape->merge_bh_size); | |
2274 | ||
2275 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; | |
2276 | drive->driver_data = NULL; | |
2277 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); | |
2278 | device_destroy(idetape_sysfs_class, | |
2279 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); | |
2280 | idetape_devs[tape->minor] = NULL; | |
2281 | g->private_data = NULL; | |
2282 | put_disk(g); | |
2283 | kfree(tape); | |
2284 | } | |
2285 | ||
2286 | #ifdef CONFIG_IDE_PROC_FS | |
2287 | static int proc_idetape_read_name | |
2288 | (char *page, char **start, off_t off, int count, int *eof, void *data) | |
2289 | { | |
2290 | ide_drive_t *drive = (ide_drive_t *) data; | |
2291 | idetape_tape_t *tape = drive->driver_data; | |
2292 | char *out = page; | |
2293 | int len; | |
2294 | ||
2295 | len = sprintf(out, "%s\n", tape->name); | |
2296 | PROC_IDE_READ_RETURN(page, start, off, count, eof, len); | |
2297 | } | |
2298 | ||
2299 | static ide_proc_entry_t idetape_proc[] = { | |
2300 | { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL }, | |
2301 | { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, | |
2302 | { NULL, 0, NULL, NULL } | |
2303 | }; | |
2304 | ||
2305 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) | |
2306 | { | |
2307 | return idetape_proc; | |
2308 | } | |
2309 | ||
2310 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) | |
2311 | { | |
2312 | return idetape_settings; | |
2313 | } | |
2314 | #endif | |
2315 | ||
2316 | static int ide_tape_probe(ide_drive_t *); | |
2317 | ||
2318 | static struct ide_driver idetape_driver = { | |
2319 | .gen_driver = { | |
2320 | .owner = THIS_MODULE, | |
2321 | .name = "ide-tape", | |
2322 | .bus = &ide_bus_type, | |
2323 | }, | |
2324 | .probe = ide_tape_probe, | |
2325 | .remove = ide_tape_remove, | |
2326 | .version = IDETAPE_VERSION, | |
2327 | .do_request = idetape_do_request, | |
2328 | .end_request = idetape_end_request, | |
2329 | #ifdef CONFIG_IDE_PROC_FS | |
2330 | .proc_entries = ide_tape_proc_entries, | |
2331 | .proc_devsets = ide_tape_proc_devsets, | |
2332 | #endif | |
2333 | }; | |
2334 | ||
2335 | /* Our character device supporting functions, passed to register_chrdev. */ | |
2336 | static const struct file_operations idetape_fops = { | |
2337 | .owner = THIS_MODULE, | |
2338 | .read = idetape_chrdev_read, | |
2339 | .write = idetape_chrdev_write, | |
2340 | .ioctl = idetape_chrdev_ioctl, | |
2341 | .open = idetape_chrdev_open, | |
2342 | .release = idetape_chrdev_release, | |
2343 | }; | |
2344 | ||
2345 | static int idetape_open(struct block_device *bdev, fmode_t mode) | |
2346 | { | |
2347 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk); | |
2348 | ||
2349 | if (!tape) | |
2350 | return -ENXIO; | |
2351 | ||
2352 | return 0; | |
2353 | } | |
2354 | ||
2355 | static int idetape_release(struct gendisk *disk, fmode_t mode) | |
2356 | { | |
2357 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); | |
2358 | ||
2359 | ide_tape_put(tape); | |
2360 | return 0; | |
2361 | } | |
2362 | ||
2363 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, | |
2364 | unsigned int cmd, unsigned long arg) | |
2365 | { | |
2366 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); | |
2367 | ide_drive_t *drive = tape->drive; | |
2368 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); | |
2369 | if (err == -EINVAL) | |
2370 | err = idetape_blkdev_ioctl(drive, cmd, arg); | |
2371 | return err; | |
2372 | } | |
2373 | ||
2374 | static struct block_device_operations idetape_block_ops = { | |
2375 | .owner = THIS_MODULE, | |
2376 | .open = idetape_open, | |
2377 | .release = idetape_release, | |
2378 | .locked_ioctl = idetape_ioctl, | |
2379 | }; | |
2380 | ||
2381 | static int ide_tape_probe(ide_drive_t *drive) | |
2382 | { | |
2383 | idetape_tape_t *tape; | |
2384 | struct gendisk *g; | |
2385 | int minor; | |
2386 | ||
2387 | if (!strstr("ide-tape", drive->driver_req)) | |
2388 | goto failed; | |
2389 | ||
2390 | if (drive->media != ide_tape) | |
2391 | goto failed; | |
2392 | ||
2393 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && | |
2394 | ide_check_atapi_device(drive, DRV_NAME) == 0) { | |
2395 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" | |
2396 | " the driver\n", drive->name); | |
2397 | goto failed; | |
2398 | } | |
2399 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); | |
2400 | if (tape == NULL) { | |
2401 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", | |
2402 | drive->name); | |
2403 | goto failed; | |
2404 | } | |
2405 | ||
2406 | g = alloc_disk(1 << PARTN_BITS); | |
2407 | if (!g) | |
2408 | goto out_free_tape; | |
2409 | ||
2410 | ide_init_disk(g, drive); | |
2411 | ||
2412 | tape->dev.parent = &drive->gendev; | |
2413 | tape->dev.release = ide_tape_release; | |
2414 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); | |
2415 | ||
2416 | if (device_register(&tape->dev)) | |
2417 | goto out_free_disk; | |
2418 | ||
2419 | tape->drive = drive; | |
2420 | tape->driver = &idetape_driver; | |
2421 | tape->disk = g; | |
2422 | ||
2423 | g->private_data = &tape->driver; | |
2424 | ||
2425 | drive->driver_data = tape; | |
2426 | ||
2427 | mutex_lock(&idetape_ref_mutex); | |
2428 | for (minor = 0; idetape_devs[minor]; minor++) | |
2429 | ; | |
2430 | idetape_devs[minor] = tape; | |
2431 | mutex_unlock(&idetape_ref_mutex); | |
2432 | ||
2433 | idetape_setup(drive, tape, minor); | |
2434 | ||
2435 | device_create(idetape_sysfs_class, &drive->gendev, | |
2436 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); | |
2437 | device_create(idetape_sysfs_class, &drive->gendev, | |
2438 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, | |
2439 | "n%s", tape->name); | |
2440 | ||
2441 | g->fops = &idetape_block_ops; | |
2442 | ide_register_region(g); | |
2443 | ||
2444 | return 0; | |
2445 | ||
2446 | out_free_disk: | |
2447 | put_disk(g); | |
2448 | out_free_tape: | |
2449 | kfree(tape); | |
2450 | failed: | |
2451 | return -ENODEV; | |
2452 | } | |
2453 | ||
2454 | static void __exit idetape_exit(void) | |
2455 | { | |
2456 | driver_unregister(&idetape_driver.gen_driver); | |
2457 | class_destroy(idetape_sysfs_class); | |
2458 | unregister_chrdev(IDETAPE_MAJOR, "ht"); | |
2459 | } | |
2460 | ||
2461 | static int __init idetape_init(void) | |
2462 | { | |
2463 | int error = 1; | |
2464 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); | |
2465 | if (IS_ERR(idetape_sysfs_class)) { | |
2466 | idetape_sysfs_class = NULL; | |
2467 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); | |
2468 | error = -EBUSY; | |
2469 | goto out; | |
2470 | } | |
2471 | ||
2472 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { | |
2473 | printk(KERN_ERR "ide-tape: Failed to register chrdev" | |
2474 | " interface\n"); | |
2475 | error = -EBUSY; | |
2476 | goto out_free_class; | |
2477 | } | |
2478 | ||
2479 | error = driver_register(&idetape_driver.gen_driver); | |
2480 | if (error) | |
2481 | goto out_free_driver; | |
2482 | ||
2483 | return 0; | |
2484 | ||
2485 | out_free_driver: | |
2486 | driver_unregister(&idetape_driver.gen_driver); | |
2487 | out_free_class: | |
2488 | class_destroy(idetape_sysfs_class); | |
2489 | out: | |
2490 | return error; | |
2491 | } | |
2492 | ||
2493 | MODULE_ALIAS("ide:*m-tape*"); | |
2494 | module_init(idetape_init); | |
2495 | module_exit(idetape_exit); | |
2496 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); | |
2497 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); | |
2498 | MODULE_LICENSE("GPL"); |