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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/seq_file.h> |
35 | #include <linux/slab.h> |
36 | #include <linux/pci.h> |
37 | #include <linux/ide.h> |
38 | #include <linux/smp_lock.h> |
39 | #include <linux/completion.h> |
40 | #include <linux/bitops.h> |
41 | #include <linux/mutex.h> |
42 | #include <scsi/scsi.h> |
43 | |
44 | #include <asm/byteorder.h> |
45 | #include <linux/irq.h> |
46 | #include <linux/uaccess.h> |
47 | #include <linux/io.h> |
48 | #include <asm/unaligned.h> |
49 | #include <linux/mtio.h> |
50 | |
51 | /* define to see debug info */ |
52 | #undef IDETAPE_DEBUG_LOG |
53 | |
54 | #ifdef IDETAPE_DEBUG_LOG |
55 | #define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, ## args) |
56 | #else |
57 | #define ide_debug_log(lvl, fmt, args...) do {} while (0) |
58 | #endif |
59 | |
60 | /**************************** Tunable parameters *****************************/ |
61 | /* |
62 | * After each failed packet command we issue a request sense command and retry |
63 | * the packet command IDETAPE_MAX_PC_RETRIES times. |
64 | * |
65 | * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
66 | */ |
67 | #define IDETAPE_MAX_PC_RETRIES 3 |
68 | |
69 | /* |
70 | * The following parameter is used to select the point in the internal tape fifo |
71 | * in which we will start to refill the buffer. Decreasing the following |
72 | * parameter will improve the system's latency and interactive response, while |
73 | * using a high value might improve system throughput. |
74 | */ |
75 | #define IDETAPE_FIFO_THRESHOLD 2 |
76 | |
77 | /* |
78 | * DSC polling parameters. |
79 | * |
80 | * Polling for DSC (a single bit in the status register) is a very important |
81 | * function in ide-tape. There are two cases in which we poll for DSC: |
82 | * |
83 | * 1. Before a read/write packet command, to ensure that we can transfer data |
84 | * from/to the tape's data buffers, without causing an actual media access. |
85 | * In case the tape is not ready yet, we take out our request from the device |
86 | * request queue, so that ide.c could service requests from the other device |
87 | * on the same interface in the meantime. |
88 | * |
89 | * 2. After the successful initialization of a "media access packet command", |
90 | * which is a command that can take a long time to complete (the interval can |
91 | * range from several seconds to even an hour). Again, we postpone our request |
92 | * in the middle to free the bus for the other device. The polling frequency |
93 | * here should be lower than the read/write frequency since those media access |
94 | * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST |
95 | * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD |
96 | * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min). |
97 | * |
98 | * We also set a timeout for the timer, in case something goes wrong. The |
99 | * timeout should be longer then the maximum execution time of a tape operation. |
100 | */ |
101 | |
102 | /* DSC timings. */ |
103 | #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
104 | #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
105 | #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
106 | #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
107 | #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
108 | #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
109 | #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
110 | |
111 | /*************************** End of tunable parameters ***********************/ |
112 | |
113 | /* tape directions */ |
114 | enum { |
115 | IDETAPE_DIR_NONE = (1 << 0), |
116 | IDETAPE_DIR_READ = (1 << 1), |
117 | IDETAPE_DIR_WRITE = (1 << 2), |
118 | }; |
119 | |
120 | /* Tape door status */ |
121 | #define DOOR_UNLOCKED 0 |
122 | #define DOOR_LOCKED 1 |
123 | #define DOOR_EXPLICITLY_LOCKED 2 |
124 | |
125 | /* Some defines for the SPACE command */ |
126 | #define IDETAPE_SPACE_OVER_FILEMARK 1 |
127 | #define IDETAPE_SPACE_TO_EOD 3 |
128 | |
129 | /* Some defines for the LOAD UNLOAD command */ |
130 | #define IDETAPE_LU_LOAD_MASK 1 |
131 | #define IDETAPE_LU_RETENSION_MASK 2 |
132 | #define IDETAPE_LU_EOT_MASK 4 |
133 | |
134 | /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */ |
135 | #define IDETAPE_BLOCK_DESCRIPTOR 0 |
136 | #define IDETAPE_CAPABILITIES_PAGE 0x2a |
137 | |
138 | /* |
139 | * Most of our global data which we need to save even as we leave the driver due |
140 | * to an interrupt or a timer event is stored in the struct defined below. |
141 | */ |
142 | typedef struct ide_tape_obj { |
143 | ide_drive_t *drive; |
144 | struct ide_driver *driver; |
145 | struct gendisk *disk; |
146 | struct device dev; |
147 | |
148 | /* used by REQ_IDETAPE_{READ,WRITE} requests */ |
149 | struct ide_atapi_pc queued_pc; |
150 | |
151 | /* |
152 | * DSC polling variables. |
153 | * |
154 | * While polling for DSC we use postponed_rq to postpone the current |
155 | * request so that ide.c will be able to service pending requests on the |
156 | * other device. Note that at most we will have only one DSC (usually |
157 | * data transfer) request in the device request queue. |
158 | */ |
159 | bool postponed_rq; |
160 | |
161 | /* The time in which we started polling for DSC */ |
162 | unsigned long dsc_polling_start; |
163 | /* Timer used to poll for dsc */ |
164 | struct timer_list dsc_timer; |
165 | /* Read/Write dsc polling frequency */ |
166 | unsigned long best_dsc_rw_freq; |
167 | unsigned long dsc_poll_freq; |
168 | unsigned long dsc_timeout; |
169 | |
170 | /* Read position information */ |
171 | u8 partition; |
172 | /* Current block */ |
173 | unsigned int first_frame; |
174 | |
175 | /* Last error information */ |
176 | u8 sense_key, asc, ascq; |
177 | |
178 | /* Character device operation */ |
179 | unsigned int minor; |
180 | /* device name */ |
181 | char name[4]; |
182 | /* Current character device data transfer direction */ |
183 | u8 chrdev_dir; |
184 | |
185 | /* tape block size, usually 512 or 1024 bytes */ |
186 | unsigned short blk_size; |
187 | int user_bs_factor; |
188 | |
189 | /* Copy of the tape's Capabilities and Mechanical Page */ |
190 | u8 caps[20]; |
191 | |
192 | /* |
193 | * Active data transfer request parameters. |
194 | * |
195 | * At most, there is only one ide-tape originated data transfer request |
196 | * in the device request queue. This allows ide.c to easily service |
197 | * requests from the other device when we postpone our active request. |
198 | */ |
199 | |
200 | /* Data buffer size chosen based on the tape's recommendation */ |
201 | int buffer_size; |
202 | /* Staging buffer of buffer_size bytes */ |
203 | void *buf; |
204 | /* The read/write cursor */ |
205 | void *cur; |
206 | /* The number of valid bytes in buf */ |
207 | size_t valid; |
208 | |
209 | /* Measures average tape speed */ |
210 | unsigned long avg_time; |
211 | int avg_size; |
212 | int avg_speed; |
213 | |
214 | /* the door is currently locked */ |
215 | int door_locked; |
216 | /* the tape hardware is write protected */ |
217 | char drv_write_prot; |
218 | /* the tape is write protected (hardware or opened as read-only) */ |
219 | char write_prot; |
220 | } idetape_tape_t; |
221 | |
222 | static DEFINE_MUTEX(idetape_ref_mutex); |
223 | |
224 | static DEFINE_MUTEX(idetape_chrdev_mutex); |
225 | |
226 | static struct class *idetape_sysfs_class; |
227 | |
228 | static void ide_tape_release(struct device *); |
229 | |
230 | static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES]; |
231 | |
232 | static struct ide_tape_obj *ide_tape_get(struct gendisk *disk, bool cdev, |
233 | unsigned int i) |
234 | { |
235 | struct ide_tape_obj *tape = NULL; |
236 | |
237 | mutex_lock(&idetape_ref_mutex); |
238 | |
239 | if (cdev) |
240 | tape = idetape_devs[i]; |
241 | else |
242 | tape = ide_drv_g(disk, ide_tape_obj); |
243 | |
244 | if (tape) { |
245 | if (ide_device_get(tape->drive)) |
246 | tape = NULL; |
247 | else |
248 | get_device(&tape->dev); |
249 | } |
250 | |
251 | mutex_unlock(&idetape_ref_mutex); |
252 | return tape; |
253 | } |
254 | |
255 | static void ide_tape_put(struct ide_tape_obj *tape) |
256 | { |
257 | ide_drive_t *drive = tape->drive; |
258 | |
259 | mutex_lock(&idetape_ref_mutex); |
260 | put_device(&tape->dev); |
261 | ide_device_put(drive); |
262 | mutex_unlock(&idetape_ref_mutex); |
263 | } |
264 | |
265 | /* |
266 | * called on each failed packet command retry to analyze the request sense. We |
267 | * currently do not utilize this information. |
268 | */ |
269 | static void idetape_analyze_error(ide_drive_t *drive) |
270 | { |
271 | idetape_tape_t *tape = drive->driver_data; |
272 | struct ide_atapi_pc *pc = drive->failed_pc; |
273 | struct request *rq = drive->hwif->rq; |
274 | u8 *sense = bio_data(rq->bio); |
275 | |
276 | tape->sense_key = sense[2] & 0xF; |
277 | tape->asc = sense[12]; |
278 | tape->ascq = sense[13]; |
279 | |
280 | ide_debug_log(IDE_DBG_FUNC, |
281 | "cmd: 0x%x, sense key = %x, asc = %x, ascq = %x", |
282 | rq->cmd[0], tape->sense_key, tape->asc, tape->ascq); |
283 | |
284 | /* correct remaining bytes to transfer */ |
285 | if (pc->flags & PC_FLAG_DMA_ERROR) |
286 | rq->resid_len = tape->blk_size * get_unaligned_be32(&sense[3]); |
287 | |
288 | /* |
289 | * If error was the result of a zero-length read or write command, |
290 | * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives |
291 | * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes. |
292 | */ |
293 | if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6) |
294 | /* length == 0 */ |
295 | && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) { |
296 | if (tape->sense_key == 5) { |
297 | /* don't report an error, everything's ok */ |
298 | pc->error = 0; |
299 | /* don't retry read/write */ |
300 | pc->flags |= PC_FLAG_ABORT; |
301 | } |
302 | } |
303 | if (pc->c[0] == READ_6 && (sense[2] & 0x80)) { |
304 | pc->error = IDE_DRV_ERROR_FILEMARK; |
305 | pc->flags |= PC_FLAG_ABORT; |
306 | } |
307 | if (pc->c[0] == WRITE_6) { |
308 | if ((sense[2] & 0x40) || (tape->sense_key == 0xd |
309 | && tape->asc == 0x0 && tape->ascq == 0x2)) { |
310 | pc->error = IDE_DRV_ERROR_EOD; |
311 | pc->flags |= PC_FLAG_ABORT; |
312 | } |
313 | } |
314 | if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
315 | if (tape->sense_key == 8) { |
316 | pc->error = IDE_DRV_ERROR_EOD; |
317 | pc->flags |= PC_FLAG_ABORT; |
318 | } |
319 | if (!(pc->flags & PC_FLAG_ABORT) && |
320 | (blk_rq_bytes(rq) - rq->resid_len)) |
321 | pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
322 | } |
323 | } |
324 | |
325 | static void ide_tape_handle_dsc(ide_drive_t *); |
326 | |
327 | static int ide_tape_callback(ide_drive_t *drive, int dsc) |
328 | { |
329 | idetape_tape_t *tape = drive->driver_data; |
330 | struct ide_atapi_pc *pc = drive->pc; |
331 | struct request *rq = drive->hwif->rq; |
332 | int uptodate = pc->error ? 0 : 1; |
333 | int err = uptodate ? 0 : IDE_DRV_ERROR_GENERAL; |
334 | |
335 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc: %d, err: %d", rq->cmd[0], |
336 | dsc, err); |
337 | |
338 | if (dsc) |
339 | ide_tape_handle_dsc(drive); |
340 | |
341 | if (drive->failed_pc == pc) |
342 | drive->failed_pc = NULL; |
343 | |
344 | if (pc->c[0] == REQUEST_SENSE) { |
345 | if (uptodate) |
346 | idetape_analyze_error(drive); |
347 | else |
348 | printk(KERN_ERR "ide-tape: Error in REQUEST SENSE " |
349 | "itself - Aborting request!\n"); |
350 | } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) { |
351 | unsigned int blocks = |
352 | (blk_rq_bytes(rq) - rq->resid_len) / tape->blk_size; |
353 | |
354 | tape->avg_size += blocks * tape->blk_size; |
355 | |
356 | if (time_after_eq(jiffies, tape->avg_time + HZ)) { |
357 | tape->avg_speed = tape->avg_size * HZ / |
358 | (jiffies - tape->avg_time) / 1024; |
359 | tape->avg_size = 0; |
360 | tape->avg_time = jiffies; |
361 | } |
362 | |
363 | tape->first_frame += blocks; |
364 | |
365 | if (pc->error) { |
366 | uptodate = 0; |
367 | err = pc->error; |
368 | } |
369 | } |
370 | rq->errors = err; |
371 | |
372 | return uptodate; |
373 | } |
374 | |
375 | /* |
376 | * Postpone the current request so that ide.c will be able to service requests |
377 | * from another device on the same port while we are polling for DSC. |
378 | */ |
379 | static void ide_tape_stall_queue(ide_drive_t *drive) |
380 | { |
381 | idetape_tape_t *tape = drive->driver_data; |
382 | |
383 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, dsc_poll_freq: %lu", |
384 | drive->hwif->rq->cmd[0], tape->dsc_poll_freq); |
385 | |
386 | tape->postponed_rq = true; |
387 | |
388 | ide_stall_queue(drive, tape->dsc_poll_freq); |
389 | } |
390 | |
391 | static void ide_tape_handle_dsc(ide_drive_t *drive) |
392 | { |
393 | idetape_tape_t *tape = drive->driver_data; |
394 | |
395 | /* Media access command */ |
396 | tape->dsc_polling_start = jiffies; |
397 | tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST; |
398 | tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
399 | /* Allow ide.c to handle other requests */ |
400 | ide_tape_stall_queue(drive); |
401 | } |
402 | |
403 | /* |
404 | * Packet Command Interface |
405 | * |
406 | * The current Packet Command is available in drive->pc, and will not change |
407 | * until we finish handling it. Each packet command is associated with a |
408 | * callback function that will be called when the command is finished. |
409 | * |
410 | * The handling will be done in three stages: |
411 | * |
412 | * 1. ide_tape_issue_pc will send the packet command to the drive, and will set |
413 | * the interrupt handler to ide_pc_intr. |
414 | * |
415 | * 2. On each interrupt, ide_pc_intr will be called. This step will be |
416 | * repeated until the device signals us that no more interrupts will be issued. |
417 | * |
418 | * 3. ATAPI Tape media access commands have immediate status with a delayed |
419 | * process. In case of a successful initiation of a media access packet command, |
420 | * the DSC bit will be set when the actual execution of the command is finished. |
421 | * Since the tape drive will not issue an interrupt, we have to poll for this |
422 | * event. In this case, we define the request as "low priority request" by |
423 | * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and |
424 | * exit the driver. |
425 | * |
426 | * ide.c will then give higher priority to requests which originate from the |
427 | * other device, until will change rq_status to RQ_ACTIVE. |
428 | * |
429 | * 4. When the packet command is finished, it will be checked for errors. |
430 | * |
431 | * 5. In case an error was found, we queue a request sense packet command in |
432 | * front of the request queue and retry the operation up to |
433 | * IDETAPE_MAX_PC_RETRIES times. |
434 | * |
435 | * 6. In case no error was found, or we decided to give up and not to retry |
436 | * again, the callback function will be called and then we will handle the next |
437 | * request. |
438 | */ |
439 | |
440 | static ide_startstop_t ide_tape_issue_pc(ide_drive_t *drive, |
441 | struct ide_cmd *cmd, |
442 | struct ide_atapi_pc *pc) |
443 | { |
444 | idetape_tape_t *tape = drive->driver_data; |
445 | struct request *rq = drive->hwif->rq; |
446 | |
447 | if (drive->failed_pc == NULL && pc->c[0] != REQUEST_SENSE) |
448 | drive->failed_pc = pc; |
449 | |
450 | /* Set the current packet command */ |
451 | drive->pc = pc; |
452 | |
453 | if (pc->retries > IDETAPE_MAX_PC_RETRIES || |
454 | (pc->flags & PC_FLAG_ABORT)) { |
455 | |
456 | /* |
457 | * We will "abort" retrying a packet command in case legitimate |
458 | * error code was received (crossing a filemark, or end of the |
459 | * media, for example). |
460 | */ |
461 | if (!(pc->flags & PC_FLAG_ABORT)) { |
462 | if (!(pc->c[0] == TEST_UNIT_READY && |
463 | tape->sense_key == 2 && tape->asc == 4 && |
464 | (tape->ascq == 1 || tape->ascq == 8))) { |
465 | printk(KERN_ERR "ide-tape: %s: I/O error, " |
466 | "pc = %2x, key = %2x, " |
467 | "asc = %2x, ascq = %2x\n", |
468 | tape->name, pc->c[0], |
469 | tape->sense_key, tape->asc, |
470 | tape->ascq); |
471 | } |
472 | /* Giving up */ |
473 | pc->error = IDE_DRV_ERROR_GENERAL; |
474 | } |
475 | |
476 | drive->failed_pc = NULL; |
477 | drive->pc_callback(drive, 0); |
478 | ide_complete_rq(drive, -EIO, blk_rq_bytes(rq)); |
479 | return ide_stopped; |
480 | } |
481 | ide_debug_log(IDE_DBG_SENSE, "retry #%d, cmd: 0x%02x", pc->retries, |
482 | pc->c[0]); |
483 | |
484 | pc->retries++; |
485 | |
486 | return ide_issue_pc(drive, cmd); |
487 | } |
488 | |
489 | /* A mode sense command is used to "sense" tape parameters. */ |
490 | static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code) |
491 | { |
492 | ide_init_pc(pc); |
493 | pc->c[0] = MODE_SENSE; |
494 | if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
495 | /* DBD = 1 - Don't return block descriptors */ |
496 | pc->c[1] = 8; |
497 | pc->c[2] = page_code; |
498 | /* |
499 | * Changed pc->c[3] to 0 (255 will at best return unused info). |
500 | * |
501 | * For SCSI this byte is defined as subpage instead of high byte |
502 | * of length and some IDE drives seem to interpret it this way |
503 | * and return an error when 255 is used. |
504 | */ |
505 | pc->c[3] = 0; |
506 | /* We will just discard data in that case */ |
507 | pc->c[4] = 255; |
508 | if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
509 | pc->req_xfer = 12; |
510 | else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
511 | pc->req_xfer = 24; |
512 | else |
513 | pc->req_xfer = 50; |
514 | } |
515 | |
516 | static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive) |
517 | { |
518 | ide_hwif_t *hwif = drive->hwif; |
519 | idetape_tape_t *tape = drive->driver_data; |
520 | struct ide_atapi_pc *pc = drive->pc; |
521 | u8 stat; |
522 | |
523 | stat = hwif->tp_ops->read_status(hwif); |
524 | |
525 | if (stat & ATA_DSC) { |
526 | if (stat & ATA_ERR) { |
527 | /* Error detected */ |
528 | if (pc->c[0] != TEST_UNIT_READY) |
529 | printk(KERN_ERR "ide-tape: %s: I/O error, ", |
530 | tape->name); |
531 | /* Retry operation */ |
532 | ide_retry_pc(drive); |
533 | return ide_stopped; |
534 | } |
535 | pc->error = 0; |
536 | } else { |
537 | pc->error = IDE_DRV_ERROR_GENERAL; |
538 | drive->failed_pc = NULL; |
539 | } |
540 | drive->pc_callback(drive, 0); |
541 | return ide_stopped; |
542 | } |
543 | |
544 | static void ide_tape_create_rw_cmd(idetape_tape_t *tape, |
545 | struct ide_atapi_pc *pc, struct request *rq, |
546 | u8 opcode) |
547 | { |
548 | unsigned int length = blk_rq_sectors(rq) / (tape->blk_size >> 9); |
549 | |
550 | ide_init_pc(pc); |
551 | put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]); |
552 | pc->c[1] = 1; |
553 | |
554 | if (blk_rq_bytes(rq) == tape->buffer_size) |
555 | pc->flags |= PC_FLAG_DMA_OK; |
556 | |
557 | if (opcode == READ_6) |
558 | pc->c[0] = READ_6; |
559 | else if (opcode == WRITE_6) { |
560 | pc->c[0] = WRITE_6; |
561 | pc->flags |= PC_FLAG_WRITING; |
562 | } |
563 | |
564 | memcpy(rq->cmd, pc->c, 12); |
565 | } |
566 | |
567 | static ide_startstop_t idetape_do_request(ide_drive_t *drive, |
568 | struct request *rq, sector_t block) |
569 | { |
570 | ide_hwif_t *hwif = drive->hwif; |
571 | idetape_tape_t *tape = drive->driver_data; |
572 | struct ide_atapi_pc *pc = NULL; |
573 | struct ide_cmd cmd; |
574 | u8 stat; |
575 | |
576 | ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, sector: %llu, nr_sectors: %u", |
577 | rq->cmd[0], (unsigned long long)blk_rq_pos(rq), |
578 | blk_rq_sectors(rq)); |
579 | |
580 | BUG_ON(!(blk_special_request(rq) || blk_sense_request(rq))); |
581 | |
582 | /* Retry a failed packet command */ |
583 | if (drive->failed_pc && drive->pc->c[0] == REQUEST_SENSE) { |
584 | pc = drive->failed_pc; |
585 | goto out; |
586 | } |
587 | |
588 | /* |
589 | * If the tape is still busy, postpone our request and service |
590 | * the other device meanwhile. |
591 | */ |
592 | stat = hwif->tp_ops->read_status(hwif); |
593 | |
594 | if ((drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) == 0 && |
595 | (rq->cmd[13] & REQ_IDETAPE_PC2) == 0) |
596 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
597 | |
598 | if (drive->dev_flags & IDE_DFLAG_POST_RESET) { |
599 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
600 | drive->dev_flags &= ~IDE_DFLAG_POST_RESET; |
601 | } |
602 | |
603 | if (!(drive->atapi_flags & IDE_AFLAG_IGNORE_DSC) && |
604 | !(stat & ATA_DSC)) { |
605 | if (!tape->postponed_rq) { |
606 | tape->dsc_polling_start = jiffies; |
607 | tape->dsc_poll_freq = tape->best_dsc_rw_freq; |
608 | tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
609 | } else if (time_after(jiffies, tape->dsc_timeout)) { |
610 | printk(KERN_ERR "ide-tape: %s: DSC timeout\n", |
611 | tape->name); |
612 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
613 | idetape_media_access_finished(drive); |
614 | return ide_stopped; |
615 | } else { |
616 | return ide_do_reset(drive); |
617 | } |
618 | } else if (time_after(jiffies, |
619 | tape->dsc_polling_start + |
620 | IDETAPE_DSC_MA_THRESHOLD)) |
621 | tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW; |
622 | ide_tape_stall_queue(drive); |
623 | return ide_stopped; |
624 | } else { |
625 | drive->atapi_flags &= ~IDE_AFLAG_IGNORE_DSC; |
626 | tape->postponed_rq = false; |
627 | } |
628 | |
629 | if (rq->cmd[13] & REQ_IDETAPE_READ) { |
630 | pc = &tape->queued_pc; |
631 | ide_tape_create_rw_cmd(tape, pc, rq, READ_6); |
632 | goto out; |
633 | } |
634 | if (rq->cmd[13] & REQ_IDETAPE_WRITE) { |
635 | pc = &tape->queued_pc; |
636 | ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6); |
637 | goto out; |
638 | } |
639 | if (rq->cmd[13] & REQ_IDETAPE_PC1) { |
640 | pc = (struct ide_atapi_pc *)rq->special; |
641 | rq->cmd[13] &= ~(REQ_IDETAPE_PC1); |
642 | rq->cmd[13] |= REQ_IDETAPE_PC2; |
643 | goto out; |
644 | } |
645 | if (rq->cmd[13] & REQ_IDETAPE_PC2) { |
646 | idetape_media_access_finished(drive); |
647 | return ide_stopped; |
648 | } |
649 | BUG(); |
650 | |
651 | out: |
652 | /* prepare sense request for this command */ |
653 | ide_prep_sense(drive, rq); |
654 | |
655 | memset(&cmd, 0, sizeof(cmd)); |
656 | |
657 | if (rq_data_dir(rq)) |
658 | cmd.tf_flags |= IDE_TFLAG_WRITE; |
659 | |
660 | cmd.rq = rq; |
661 | |
662 | ide_init_sg_cmd(&cmd, blk_rq_bytes(rq)); |
663 | ide_map_sg(drive, &cmd); |
664 | |
665 | return ide_tape_issue_pc(drive, &cmd, pc); |
666 | } |
667 | |
668 | /* |
669 | * Write a filemark if write_filemark=1. Flush the device buffers without |
670 | * writing a filemark otherwise. |
671 | */ |
672 | static void idetape_create_write_filemark_cmd(ide_drive_t *drive, |
673 | struct ide_atapi_pc *pc, int write_filemark) |
674 | { |
675 | ide_init_pc(pc); |
676 | pc->c[0] = WRITE_FILEMARKS; |
677 | pc->c[4] = write_filemark; |
678 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
679 | } |
680 | |
681 | static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout) |
682 | { |
683 | idetape_tape_t *tape = drive->driver_data; |
684 | struct gendisk *disk = tape->disk; |
685 | int load_attempted = 0; |
686 | |
687 | /* Wait for the tape to become ready */ |
688 | set_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), &drive->atapi_flags); |
689 | timeout += jiffies; |
690 | while (time_before(jiffies, timeout)) { |
691 | if (ide_do_test_unit_ready(drive, disk) == 0) |
692 | return 0; |
693 | if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) |
694 | || (tape->asc == 0x3A)) { |
695 | /* no media */ |
696 | if (load_attempted) |
697 | return -ENOMEDIUM; |
698 | ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
699 | load_attempted = 1; |
700 | /* not about to be ready */ |
701 | } else if (!(tape->sense_key == 2 && tape->asc == 4 && |
702 | (tape->ascq == 1 || tape->ascq == 8))) |
703 | return -EIO; |
704 | msleep(100); |
705 | } |
706 | return -EIO; |
707 | } |
708 | |
709 | static int idetape_flush_tape_buffers(ide_drive_t *drive) |
710 | { |
711 | struct ide_tape_obj *tape = drive->driver_data; |
712 | struct ide_atapi_pc pc; |
713 | int rc; |
714 | |
715 | idetape_create_write_filemark_cmd(drive, &pc, 0); |
716 | rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0); |
717 | if (rc) |
718 | return rc; |
719 | idetape_wait_ready(drive, 60 * 5 * HZ); |
720 | return 0; |
721 | } |
722 | |
723 | static int ide_tape_read_position(ide_drive_t *drive) |
724 | { |
725 | idetape_tape_t *tape = drive->driver_data; |
726 | struct ide_atapi_pc pc; |
727 | u8 buf[20]; |
728 | |
729 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
730 | |
731 | /* prep cmd */ |
732 | ide_init_pc(&pc); |
733 | pc.c[0] = READ_POSITION; |
734 | pc.req_xfer = 20; |
735 | |
736 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) |
737 | return -1; |
738 | |
739 | if (!pc.error) { |
740 | ide_debug_log(IDE_DBG_FUNC, "BOP - %s", |
741 | (buf[0] & 0x80) ? "Yes" : "No"); |
742 | ide_debug_log(IDE_DBG_FUNC, "EOP - %s", |
743 | (buf[0] & 0x40) ? "Yes" : "No"); |
744 | |
745 | if (buf[0] & 0x4) { |
746 | printk(KERN_INFO "ide-tape: Block location is unknown" |
747 | "to the tape\n"); |
748 | clear_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
749 | &drive->atapi_flags); |
750 | return -1; |
751 | } else { |
752 | ide_debug_log(IDE_DBG_FUNC, "Block Location: %u", |
753 | be32_to_cpup((__be32 *)&buf[4])); |
754 | |
755 | tape->partition = buf[1]; |
756 | tape->first_frame = be32_to_cpup((__be32 *)&buf[4]); |
757 | set_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), |
758 | &drive->atapi_flags); |
759 | } |
760 | } |
761 | |
762 | return tape->first_frame; |
763 | } |
764 | |
765 | static void idetape_create_locate_cmd(ide_drive_t *drive, |
766 | struct ide_atapi_pc *pc, |
767 | unsigned int block, u8 partition, int skip) |
768 | { |
769 | ide_init_pc(pc); |
770 | pc->c[0] = POSITION_TO_ELEMENT; |
771 | pc->c[1] = 2; |
772 | put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]); |
773 | pc->c[8] = partition; |
774 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
775 | } |
776 | |
777 | static void __ide_tape_discard_merge_buffer(ide_drive_t *drive) |
778 | { |
779 | idetape_tape_t *tape = drive->driver_data; |
780 | |
781 | if (tape->chrdev_dir != IDETAPE_DIR_READ) |
782 | return; |
783 | |
784 | clear_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags); |
785 | tape->valid = 0; |
786 | if (tape->buf != NULL) { |
787 | kfree(tape->buf); |
788 | tape->buf = NULL; |
789 | } |
790 | |
791 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
792 | } |
793 | |
794 | /* |
795 | * Position the tape to the requested block using the LOCATE packet command. |
796 | * A READ POSITION command is then issued to check where we are positioned. Like |
797 | * all higher level operations, we queue the commands at the tail of the request |
798 | * queue and wait for their completion. |
799 | */ |
800 | static int idetape_position_tape(ide_drive_t *drive, unsigned int block, |
801 | u8 partition, int skip) |
802 | { |
803 | idetape_tape_t *tape = drive->driver_data; |
804 | struct gendisk *disk = tape->disk; |
805 | int ret; |
806 | struct ide_atapi_pc pc; |
807 | |
808 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
809 | __ide_tape_discard_merge_buffer(drive); |
810 | idetape_wait_ready(drive, 60 * 5 * HZ); |
811 | idetape_create_locate_cmd(drive, &pc, block, partition, skip); |
812 | ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
813 | if (ret) |
814 | return ret; |
815 | |
816 | ret = ide_tape_read_position(drive); |
817 | if (ret < 0) |
818 | return ret; |
819 | return 0; |
820 | } |
821 | |
822 | static void ide_tape_discard_merge_buffer(ide_drive_t *drive, |
823 | int restore_position) |
824 | { |
825 | idetape_tape_t *tape = drive->driver_data; |
826 | int seek, position; |
827 | |
828 | __ide_tape_discard_merge_buffer(drive); |
829 | if (restore_position) { |
830 | position = ide_tape_read_position(drive); |
831 | seek = position > 0 ? position : 0; |
832 | if (idetape_position_tape(drive, seek, 0, 0)) { |
833 | printk(KERN_INFO "ide-tape: %s: position_tape failed in" |
834 | " %s\n", tape->name, __func__); |
835 | return; |
836 | } |
837 | } |
838 | } |
839 | |
840 | /* |
841 | * Generate a read/write request for the block device interface and wait for it |
842 | * to be serviced. |
843 | */ |
844 | static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) |
845 | { |
846 | idetape_tape_t *tape = drive->driver_data; |
847 | struct request *rq; |
848 | int ret; |
849 | |
850 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x, size: %d", cmd, size); |
851 | |
852 | BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); |
853 | BUG_ON(size < 0 || size % tape->blk_size); |
854 | |
855 | rq = blk_get_request(drive->queue, READ, __GFP_WAIT); |
856 | rq->cmd_type = REQ_TYPE_SPECIAL; |
857 | rq->cmd[13] = cmd; |
858 | rq->rq_disk = tape->disk; |
859 | rq->__sector = tape->first_frame; |
860 | |
861 | if (size) { |
862 | ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size, |
863 | __GFP_WAIT); |
864 | if (ret) |
865 | goto out_put; |
866 | } |
867 | |
868 | blk_execute_rq(drive->queue, tape->disk, rq, 0); |
869 | |
870 | /* calculate the number of transferred bytes and update buffer state */ |
871 | size -= rq->resid_len; |
872 | tape->cur = tape->buf; |
873 | if (cmd == REQ_IDETAPE_READ) |
874 | tape->valid = size; |
875 | else |
876 | tape->valid = 0; |
877 | |
878 | ret = size; |
879 | if (rq->errors == IDE_DRV_ERROR_GENERAL) |
880 | ret = -EIO; |
881 | out_put: |
882 | blk_put_request(rq); |
883 | return ret; |
884 | } |
885 | |
886 | static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc) |
887 | { |
888 | ide_init_pc(pc); |
889 | pc->c[0] = INQUIRY; |
890 | pc->c[4] = 254; |
891 | pc->req_xfer = 254; |
892 | } |
893 | |
894 | static void idetape_create_rewind_cmd(ide_drive_t *drive, |
895 | struct ide_atapi_pc *pc) |
896 | { |
897 | ide_init_pc(pc); |
898 | pc->c[0] = REZERO_UNIT; |
899 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
900 | } |
901 | |
902 | static void idetape_create_erase_cmd(struct ide_atapi_pc *pc) |
903 | { |
904 | ide_init_pc(pc); |
905 | pc->c[0] = ERASE; |
906 | pc->c[1] = 1; |
907 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
908 | } |
909 | |
910 | static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) |
911 | { |
912 | ide_init_pc(pc); |
913 | pc->c[0] = SPACE; |
914 | put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]); |
915 | pc->c[1] = cmd; |
916 | pc->flags |= PC_FLAG_WAIT_FOR_DSC; |
917 | } |
918 | |
919 | static void ide_tape_flush_merge_buffer(ide_drive_t *drive) |
920 | { |
921 | idetape_tape_t *tape = drive->driver_data; |
922 | |
923 | if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { |
924 | printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" |
925 | " but we are not writing.\n"); |
926 | return; |
927 | } |
928 | if (tape->buf) { |
929 | size_t aligned = roundup(tape->valid, tape->blk_size); |
930 | |
931 | memset(tape->cur, 0, aligned - tape->valid); |
932 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, aligned); |
933 | kfree(tape->buf); |
934 | tape->buf = NULL; |
935 | } |
936 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
937 | } |
938 | |
939 | static int idetape_init_rw(ide_drive_t *drive, int dir) |
940 | { |
941 | idetape_tape_t *tape = drive->driver_data; |
942 | int rc; |
943 | |
944 | BUG_ON(dir != IDETAPE_DIR_READ && dir != IDETAPE_DIR_WRITE); |
945 | |
946 | if (tape->chrdev_dir == dir) |
947 | return 0; |
948 | |
949 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
950 | ide_tape_discard_merge_buffer(drive, 1); |
951 | else if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
952 | ide_tape_flush_merge_buffer(drive); |
953 | idetape_flush_tape_buffers(drive); |
954 | } |
955 | |
956 | if (tape->buf || tape->valid) { |
957 | printk(KERN_ERR "ide-tape: valid should be 0 now\n"); |
958 | tape->valid = 0; |
959 | } |
960 | |
961 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
962 | if (!tape->buf) |
963 | return -ENOMEM; |
964 | tape->chrdev_dir = dir; |
965 | tape->cur = tape->buf; |
966 | |
967 | /* |
968 | * Issue a 0 rw command to ensure that DSC handshake is |
969 | * switched from completion mode to buffer available mode. No |
970 | * point in issuing this if DSC overlap isn't supported, some |
971 | * drives (Seagate STT3401A) will return an error. |
972 | */ |
973 | if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) { |
974 | int cmd = dir == IDETAPE_DIR_READ ? REQ_IDETAPE_READ |
975 | : REQ_IDETAPE_WRITE; |
976 | |
977 | rc = idetape_queue_rw_tail(drive, cmd, 0); |
978 | if (rc < 0) { |
979 | kfree(tape->buf); |
980 | tape->buf = NULL; |
981 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
982 | return rc; |
983 | } |
984 | } |
985 | |
986 | return 0; |
987 | } |
988 | |
989 | static void idetape_pad_zeros(ide_drive_t *drive, int bcount) |
990 | { |
991 | idetape_tape_t *tape = drive->driver_data; |
992 | |
993 | memset(tape->buf, 0, tape->buffer_size); |
994 | |
995 | while (bcount) { |
996 | unsigned int count = min(tape->buffer_size, bcount); |
997 | |
998 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); |
999 | bcount -= count; |
1000 | } |
1001 | } |
1002 | |
1003 | /* |
1004 | * Rewinds the tape to the Beginning Of the current Partition (BOP). We |
1005 | * currently support only one partition. |
1006 | */ |
1007 | static int idetape_rewind_tape(ide_drive_t *drive) |
1008 | { |
1009 | struct ide_tape_obj *tape = drive->driver_data; |
1010 | struct gendisk *disk = tape->disk; |
1011 | struct ide_atapi_pc pc; |
1012 | int ret; |
1013 | |
1014 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1015 | |
1016 | idetape_create_rewind_cmd(drive, &pc); |
1017 | ret = ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
1018 | if (ret) |
1019 | return ret; |
1020 | |
1021 | ret = ide_tape_read_position(drive); |
1022 | if (ret < 0) |
1023 | return ret; |
1024 | return 0; |
1025 | } |
1026 | |
1027 | /* mtio.h compatible commands should be issued to the chrdev interface. */ |
1028 | static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, |
1029 | unsigned long arg) |
1030 | { |
1031 | idetape_tape_t *tape = drive->driver_data; |
1032 | void __user *argp = (void __user *)arg; |
1033 | |
1034 | struct idetape_config { |
1035 | int dsc_rw_frequency; |
1036 | int dsc_media_access_frequency; |
1037 | int nr_stages; |
1038 | } config; |
1039 | |
1040 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%04x", cmd); |
1041 | |
1042 | switch (cmd) { |
1043 | case 0x0340: |
1044 | if (copy_from_user(&config, argp, sizeof(config))) |
1045 | return -EFAULT; |
1046 | tape->best_dsc_rw_freq = config.dsc_rw_frequency; |
1047 | break; |
1048 | case 0x0350: |
1049 | memset(&config, 0, sizeof(config)); |
1050 | config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq; |
1051 | config.nr_stages = 1; |
1052 | if (copy_to_user(argp, &config, sizeof(config))) |
1053 | return -EFAULT; |
1054 | break; |
1055 | default: |
1056 | return -EIO; |
1057 | } |
1058 | return 0; |
1059 | } |
1060 | |
1061 | static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op, |
1062 | int mt_count) |
1063 | { |
1064 | idetape_tape_t *tape = drive->driver_data; |
1065 | struct gendisk *disk = tape->disk; |
1066 | struct ide_atapi_pc pc; |
1067 | int retval, count = 0; |
1068 | int sprev = !!(tape->caps[4] & 0x20); |
1069 | |
1070 | |
1071 | ide_debug_log(IDE_DBG_FUNC, "mt_op: %d, mt_count: %d", mt_op, mt_count); |
1072 | |
1073 | if (mt_count == 0) |
1074 | return 0; |
1075 | if (MTBSF == mt_op || MTBSFM == mt_op) { |
1076 | if (!sprev) |
1077 | return -EIO; |
1078 | mt_count = -mt_count; |
1079 | } |
1080 | |
1081 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1082 | tape->valid = 0; |
1083 | if (test_and_clear_bit(ilog2(IDE_AFLAG_FILEMARK), |
1084 | &drive->atapi_flags)) |
1085 | ++count; |
1086 | ide_tape_discard_merge_buffer(drive, 0); |
1087 | } |
1088 | |
1089 | switch (mt_op) { |
1090 | case MTFSF: |
1091 | case MTBSF: |
1092 | idetape_create_space_cmd(&pc, mt_count - count, |
1093 | IDETAPE_SPACE_OVER_FILEMARK); |
1094 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
1095 | case MTFSFM: |
1096 | case MTBSFM: |
1097 | if (!sprev) |
1098 | return -EIO; |
1099 | retval = idetape_space_over_filemarks(drive, MTFSF, |
1100 | mt_count - count); |
1101 | if (retval) |
1102 | return retval; |
1103 | count = (MTBSFM == mt_op ? 1 : -1); |
1104 | return idetape_space_over_filemarks(drive, MTFSF, count); |
1105 | default: |
1106 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
1107 | mt_op); |
1108 | return -EIO; |
1109 | } |
1110 | } |
1111 | |
1112 | /* |
1113 | * Our character device read / write functions. |
1114 | * |
1115 | * The tape is optimized to maximize throughput when it is transferring an |
1116 | * integral number of the "continuous transfer limit", which is a parameter of |
1117 | * the specific tape (26kB on my particular tape, 32kB for Onstream). |
1118 | * |
1119 | * As of version 1.3 of the driver, the character device provides an abstract |
1120 | * continuous view of the media - any mix of block sizes (even 1 byte) on the |
1121 | * same backup/restore procedure is supported. The driver will internally |
1122 | * convert the requests to the recommended transfer unit, so that an unmatch |
1123 | * between the user's block size to the recommended size will only result in a |
1124 | * (slightly) increased driver overhead, but will no longer hit performance. |
1125 | * This is not applicable to Onstream. |
1126 | */ |
1127 | static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, |
1128 | size_t count, loff_t *ppos) |
1129 | { |
1130 | struct ide_tape_obj *tape = file->private_data; |
1131 | ide_drive_t *drive = tape->drive; |
1132 | size_t done = 0; |
1133 | ssize_t ret = 0; |
1134 | int rc; |
1135 | |
1136 | ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); |
1137 | |
1138 | if (tape->chrdev_dir != IDETAPE_DIR_READ) { |
1139 | if (test_bit(ilog2(IDE_AFLAG_DETECT_BS), &drive->atapi_flags)) |
1140 | if (count > tape->blk_size && |
1141 | (count % tape->blk_size) == 0) |
1142 | tape->user_bs_factor = count / tape->blk_size; |
1143 | } |
1144 | |
1145 | rc = idetape_init_rw(drive, IDETAPE_DIR_READ); |
1146 | if (rc < 0) |
1147 | return rc; |
1148 | |
1149 | while (done < count) { |
1150 | size_t todo; |
1151 | |
1152 | /* refill if staging buffer is empty */ |
1153 | if (!tape->valid) { |
1154 | /* If we are at a filemark, nothing more to read */ |
1155 | if (test_bit(ilog2(IDE_AFLAG_FILEMARK), |
1156 | &drive->atapi_flags)) |
1157 | break; |
1158 | /* read */ |
1159 | if (idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, |
1160 | tape->buffer_size) <= 0) |
1161 | break; |
1162 | } |
1163 | |
1164 | /* copy out */ |
1165 | todo = min_t(size_t, count - done, tape->valid); |
1166 | if (copy_to_user(buf + done, tape->cur, todo)) |
1167 | ret = -EFAULT; |
1168 | |
1169 | tape->cur += todo; |
1170 | tape->valid -= todo; |
1171 | done += todo; |
1172 | } |
1173 | |
1174 | if (!done && test_bit(ilog2(IDE_AFLAG_FILEMARK), &drive->atapi_flags)) { |
1175 | idetape_space_over_filemarks(drive, MTFSF, 1); |
1176 | return 0; |
1177 | } |
1178 | |
1179 | return ret ? ret : done; |
1180 | } |
1181 | |
1182 | static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, |
1183 | size_t count, loff_t *ppos) |
1184 | { |
1185 | struct ide_tape_obj *tape = file->private_data; |
1186 | ide_drive_t *drive = tape->drive; |
1187 | size_t done = 0; |
1188 | ssize_t ret = 0; |
1189 | int rc; |
1190 | |
1191 | /* The drive is write protected. */ |
1192 | if (tape->write_prot) |
1193 | return -EACCES; |
1194 | |
1195 | ide_debug_log(IDE_DBG_FUNC, "count %Zd", count); |
1196 | |
1197 | /* Initialize write operation */ |
1198 | rc = idetape_init_rw(drive, IDETAPE_DIR_WRITE); |
1199 | if (rc < 0) |
1200 | return rc; |
1201 | |
1202 | while (done < count) { |
1203 | size_t todo; |
1204 | |
1205 | /* flush if staging buffer is full */ |
1206 | if (tape->valid == tape->buffer_size && |
1207 | idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, |
1208 | tape->buffer_size) <= 0) |
1209 | return rc; |
1210 | |
1211 | /* copy in */ |
1212 | todo = min_t(size_t, count - done, |
1213 | tape->buffer_size - tape->valid); |
1214 | if (copy_from_user(tape->cur, buf + done, todo)) |
1215 | ret = -EFAULT; |
1216 | |
1217 | tape->cur += todo; |
1218 | tape->valid += todo; |
1219 | done += todo; |
1220 | } |
1221 | |
1222 | return ret ? ret : done; |
1223 | } |
1224 | |
1225 | static int idetape_write_filemark(ide_drive_t *drive) |
1226 | { |
1227 | struct ide_tape_obj *tape = drive->driver_data; |
1228 | struct ide_atapi_pc pc; |
1229 | |
1230 | /* Write a filemark */ |
1231 | idetape_create_write_filemark_cmd(drive, &pc, 1); |
1232 | if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) { |
1233 | printk(KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
1234 | return -EIO; |
1235 | } |
1236 | return 0; |
1237 | } |
1238 | |
1239 | /* |
1240 | * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is |
1241 | * requested. |
1242 | * |
1243 | * Note: MTBSF and MTBSFM are not supported when the tape doesn't support |
1244 | * spacing over filemarks in the reverse direction. In this case, MTFSFM is also |
1245 | * usually not supported. |
1246 | * |
1247 | * The following commands are currently not supported: |
1248 | * |
1249 | * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS, |
1250 | * MT_ST_WRITE_THRESHOLD. |
1251 | */ |
1252 | static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count) |
1253 | { |
1254 | idetape_tape_t *tape = drive->driver_data; |
1255 | struct gendisk *disk = tape->disk; |
1256 | struct ide_atapi_pc pc; |
1257 | int i, retval; |
1258 | |
1259 | ide_debug_log(IDE_DBG_FUNC, "MTIOCTOP ioctl: mt_op: %d, mt_count: %d", |
1260 | mt_op, mt_count); |
1261 | |
1262 | switch (mt_op) { |
1263 | case MTFSF: |
1264 | case MTFSFM: |
1265 | case MTBSF: |
1266 | case MTBSFM: |
1267 | if (!mt_count) |
1268 | return 0; |
1269 | return idetape_space_over_filemarks(drive, mt_op, mt_count); |
1270 | default: |
1271 | break; |
1272 | } |
1273 | |
1274 | switch (mt_op) { |
1275 | case MTWEOF: |
1276 | if (tape->write_prot) |
1277 | return -EACCES; |
1278 | ide_tape_discard_merge_buffer(drive, 1); |
1279 | for (i = 0; i < mt_count; i++) { |
1280 | retval = idetape_write_filemark(drive); |
1281 | if (retval) |
1282 | return retval; |
1283 | } |
1284 | return 0; |
1285 | case MTREW: |
1286 | ide_tape_discard_merge_buffer(drive, 0); |
1287 | if (idetape_rewind_tape(drive)) |
1288 | return -EIO; |
1289 | return 0; |
1290 | case MTLOAD: |
1291 | ide_tape_discard_merge_buffer(drive, 0); |
1292 | return ide_do_start_stop(drive, disk, IDETAPE_LU_LOAD_MASK); |
1293 | case MTUNLOAD: |
1294 | case MTOFFL: |
1295 | /* |
1296 | * If door is locked, attempt to unlock before |
1297 | * attempting to eject. |
1298 | */ |
1299 | if (tape->door_locked) { |
1300 | if (!ide_set_media_lock(drive, disk, 0)) |
1301 | tape->door_locked = DOOR_UNLOCKED; |
1302 | } |
1303 | ide_tape_discard_merge_buffer(drive, 0); |
1304 | retval = ide_do_start_stop(drive, disk, !IDETAPE_LU_LOAD_MASK); |
1305 | if (!retval) |
1306 | clear_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1307 | &drive->atapi_flags); |
1308 | return retval; |
1309 | case MTNOP: |
1310 | ide_tape_discard_merge_buffer(drive, 0); |
1311 | return idetape_flush_tape_buffers(drive); |
1312 | case MTRETEN: |
1313 | ide_tape_discard_merge_buffer(drive, 0); |
1314 | return ide_do_start_stop(drive, disk, |
1315 | IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
1316 | case MTEOM: |
1317 | idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD); |
1318 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
1319 | case MTERASE: |
1320 | (void)idetape_rewind_tape(drive); |
1321 | idetape_create_erase_cmd(&pc); |
1322 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
1323 | case MTSETBLK: |
1324 | if (mt_count) { |
1325 | if (mt_count < tape->blk_size || |
1326 | mt_count % tape->blk_size) |
1327 | return -EIO; |
1328 | tape->user_bs_factor = mt_count / tape->blk_size; |
1329 | clear_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1330 | &drive->atapi_flags); |
1331 | } else |
1332 | set_bit(ilog2(IDE_AFLAG_DETECT_BS), |
1333 | &drive->atapi_flags); |
1334 | return 0; |
1335 | case MTSEEK: |
1336 | ide_tape_discard_merge_buffer(drive, 0); |
1337 | return idetape_position_tape(drive, |
1338 | mt_count * tape->user_bs_factor, tape->partition, 0); |
1339 | case MTSETPART: |
1340 | ide_tape_discard_merge_buffer(drive, 0); |
1341 | return idetape_position_tape(drive, 0, mt_count, 0); |
1342 | case MTFSR: |
1343 | case MTBSR: |
1344 | case MTLOCK: |
1345 | retval = ide_set_media_lock(drive, disk, 1); |
1346 | if (retval) |
1347 | return retval; |
1348 | tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
1349 | return 0; |
1350 | case MTUNLOCK: |
1351 | retval = ide_set_media_lock(drive, disk, 0); |
1352 | if (retval) |
1353 | return retval; |
1354 | tape->door_locked = DOOR_UNLOCKED; |
1355 | return 0; |
1356 | default: |
1357 | printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n", |
1358 | mt_op); |
1359 | return -EIO; |
1360 | } |
1361 | } |
1362 | |
1363 | /* |
1364 | * Our character device ioctls. General mtio.h magnetic io commands are |
1365 | * supported here, and not in the corresponding block interface. Our own |
1366 | * ide-tape ioctls are supported on both interfaces. |
1367 | */ |
1368 | static long do_idetape_chrdev_ioctl(struct file *file, |
1369 | unsigned int cmd, unsigned long arg) |
1370 | { |
1371 | struct ide_tape_obj *tape = file->private_data; |
1372 | ide_drive_t *drive = tape->drive; |
1373 | struct mtop mtop; |
1374 | struct mtget mtget; |
1375 | struct mtpos mtpos; |
1376 | int block_offset = 0, position = tape->first_frame; |
1377 | void __user *argp = (void __user *)arg; |
1378 | |
1379 | ide_debug_log(IDE_DBG_FUNC, "cmd: 0x%x", cmd); |
1380 | |
1381 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) { |
1382 | ide_tape_flush_merge_buffer(drive); |
1383 | idetape_flush_tape_buffers(drive); |
1384 | } |
1385 | if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
1386 | block_offset = tape->valid / |
1387 | (tape->blk_size * tape->user_bs_factor); |
1388 | position = ide_tape_read_position(drive); |
1389 | if (position < 0) |
1390 | return -EIO; |
1391 | } |
1392 | switch (cmd) { |
1393 | case MTIOCTOP: |
1394 | if (copy_from_user(&mtop, argp, sizeof(struct mtop))) |
1395 | return -EFAULT; |
1396 | return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count); |
1397 | case MTIOCGET: |
1398 | memset(&mtget, 0, sizeof(struct mtget)); |
1399 | mtget.mt_type = MT_ISSCSI2; |
1400 | mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
1401 | mtget.mt_dsreg = |
1402 | ((tape->blk_size * tape->user_bs_factor) |
1403 | << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
1404 | |
1405 | if (tape->drv_write_prot) |
1406 | mtget.mt_gstat |= GMT_WR_PROT(0xffffffff); |
1407 | |
1408 | if (copy_to_user(argp, &mtget, sizeof(struct mtget))) |
1409 | return -EFAULT; |
1410 | return 0; |
1411 | case MTIOCPOS: |
1412 | mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
1413 | if (copy_to_user(argp, &mtpos, sizeof(struct mtpos))) |
1414 | return -EFAULT; |
1415 | return 0; |
1416 | default: |
1417 | if (tape->chrdev_dir == IDETAPE_DIR_READ) |
1418 | ide_tape_discard_merge_buffer(drive, 1); |
1419 | return idetape_blkdev_ioctl(drive, cmd, arg); |
1420 | } |
1421 | } |
1422 | |
1423 | static long idetape_chrdev_ioctl(struct file *file, |
1424 | unsigned int cmd, unsigned long arg) |
1425 | { |
1426 | long ret; |
1427 | lock_kernel(); |
1428 | ret = do_idetape_chrdev_ioctl(file, cmd, arg); |
1429 | unlock_kernel(); |
1430 | return ret; |
1431 | } |
1432 | |
1433 | /* |
1434 | * Do a mode sense page 0 with block descriptor and if it succeeds set the tape |
1435 | * block size with the reported value. |
1436 | */ |
1437 | static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive) |
1438 | { |
1439 | idetape_tape_t *tape = drive->driver_data; |
1440 | struct ide_atapi_pc pc; |
1441 | u8 buf[12]; |
1442 | |
1443 | idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR); |
1444 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { |
1445 | printk(KERN_ERR "ide-tape: Can't get block descriptor\n"); |
1446 | if (tape->blk_size == 0) { |
1447 | printk(KERN_WARNING "ide-tape: Cannot deal with zero " |
1448 | "block size, assuming 32k\n"); |
1449 | tape->blk_size = 32768; |
1450 | } |
1451 | return; |
1452 | } |
1453 | tape->blk_size = (buf[4 + 5] << 16) + |
1454 | (buf[4 + 6] << 8) + |
1455 | buf[4 + 7]; |
1456 | tape->drv_write_prot = (buf[2] & 0x80) >> 7; |
1457 | |
1458 | ide_debug_log(IDE_DBG_FUNC, "blk_size: %d, write_prot: %d", |
1459 | tape->blk_size, tape->drv_write_prot); |
1460 | } |
1461 | |
1462 | static int idetape_chrdev_open(struct inode *inode, struct file *filp) |
1463 | { |
1464 | unsigned int minor = iminor(inode), i = minor & ~0xc0; |
1465 | ide_drive_t *drive; |
1466 | idetape_tape_t *tape; |
1467 | int retval; |
1468 | |
1469 | if (i >= MAX_HWIFS * MAX_DRIVES) |
1470 | return -ENXIO; |
1471 | |
1472 | mutex_lock(&idetape_chrdev_mutex); |
1473 | |
1474 | tape = ide_tape_get(NULL, true, i); |
1475 | if (!tape) { |
1476 | mutex_unlock(&idetape_chrdev_mutex); |
1477 | return -ENXIO; |
1478 | } |
1479 | |
1480 | drive = tape->drive; |
1481 | filp->private_data = tape; |
1482 | |
1483 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1484 | |
1485 | /* |
1486 | * We really want to do nonseekable_open(inode, filp); here, but some |
1487 | * versions of tar incorrectly call lseek on tapes and bail out if that |
1488 | * fails. So we disallow pread() and pwrite(), but permit lseeks. |
1489 | */ |
1490 | filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); |
1491 | |
1492 | |
1493 | if (test_and_set_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags)) { |
1494 | retval = -EBUSY; |
1495 | goto out_put_tape; |
1496 | } |
1497 | |
1498 | retval = idetape_wait_ready(drive, 60 * HZ); |
1499 | if (retval) { |
1500 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1501 | printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
1502 | goto out_put_tape; |
1503 | } |
1504 | |
1505 | ide_tape_read_position(drive); |
1506 | if (!test_bit(ilog2(IDE_AFLAG_ADDRESS_VALID), &drive->atapi_flags)) |
1507 | (void)idetape_rewind_tape(drive); |
1508 | |
1509 | /* Read block size and write protect status from drive. */ |
1510 | ide_tape_get_bsize_from_bdesc(drive); |
1511 | |
1512 | /* Set write protect flag if device is opened as read-only. */ |
1513 | if ((filp->f_flags & O_ACCMODE) == O_RDONLY) |
1514 | tape->write_prot = 1; |
1515 | else |
1516 | tape->write_prot = tape->drv_write_prot; |
1517 | |
1518 | /* Make sure drive isn't write protected if user wants to write. */ |
1519 | if (tape->write_prot) { |
1520 | if ((filp->f_flags & O_ACCMODE) == O_WRONLY || |
1521 | (filp->f_flags & O_ACCMODE) == O_RDWR) { |
1522 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1523 | retval = -EROFS; |
1524 | goto out_put_tape; |
1525 | } |
1526 | } |
1527 | |
1528 | /* Lock the tape drive door so user can't eject. */ |
1529 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1530 | if (!ide_set_media_lock(drive, tape->disk, 1)) { |
1531 | if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
1532 | tape->door_locked = DOOR_LOCKED; |
1533 | } |
1534 | } |
1535 | mutex_unlock(&idetape_chrdev_mutex); |
1536 | |
1537 | return 0; |
1538 | |
1539 | out_put_tape: |
1540 | ide_tape_put(tape); |
1541 | |
1542 | mutex_unlock(&idetape_chrdev_mutex); |
1543 | |
1544 | return retval; |
1545 | } |
1546 | |
1547 | static void idetape_write_release(ide_drive_t *drive, unsigned int minor) |
1548 | { |
1549 | idetape_tape_t *tape = drive->driver_data; |
1550 | |
1551 | ide_tape_flush_merge_buffer(drive); |
1552 | tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL); |
1553 | if (tape->buf != NULL) { |
1554 | idetape_pad_zeros(drive, tape->blk_size * |
1555 | (tape->user_bs_factor - 1)); |
1556 | kfree(tape->buf); |
1557 | tape->buf = NULL; |
1558 | } |
1559 | idetape_write_filemark(drive); |
1560 | idetape_flush_tape_buffers(drive); |
1561 | idetape_flush_tape_buffers(drive); |
1562 | } |
1563 | |
1564 | static int idetape_chrdev_release(struct inode *inode, struct file *filp) |
1565 | { |
1566 | struct ide_tape_obj *tape = filp->private_data; |
1567 | ide_drive_t *drive = tape->drive; |
1568 | unsigned int minor = iminor(inode); |
1569 | |
1570 | mutex_lock(&idetape_chrdev_mutex); |
1571 | |
1572 | tape = drive->driver_data; |
1573 | |
1574 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1575 | |
1576 | if (tape->chrdev_dir == IDETAPE_DIR_WRITE) |
1577 | idetape_write_release(drive, minor); |
1578 | if (tape->chrdev_dir == IDETAPE_DIR_READ) { |
1579 | if (minor < 128) |
1580 | ide_tape_discard_merge_buffer(drive, 1); |
1581 | } |
1582 | |
1583 | if (minor < 128 && test_bit(ilog2(IDE_AFLAG_MEDIUM_PRESENT), |
1584 | &drive->atapi_flags)) |
1585 | (void) idetape_rewind_tape(drive); |
1586 | |
1587 | if (tape->chrdev_dir == IDETAPE_DIR_NONE) { |
1588 | if (tape->door_locked == DOOR_LOCKED) { |
1589 | if (!ide_set_media_lock(drive, tape->disk, 0)) |
1590 | tape->door_locked = DOOR_UNLOCKED; |
1591 | } |
1592 | } |
1593 | clear_bit(ilog2(IDE_AFLAG_BUSY), &drive->atapi_flags); |
1594 | ide_tape_put(tape); |
1595 | |
1596 | mutex_unlock(&idetape_chrdev_mutex); |
1597 | |
1598 | return 0; |
1599 | } |
1600 | |
1601 | static void idetape_get_inquiry_results(ide_drive_t *drive) |
1602 | { |
1603 | idetape_tape_t *tape = drive->driver_data; |
1604 | struct ide_atapi_pc pc; |
1605 | u8 pc_buf[256]; |
1606 | char fw_rev[4], vendor_id[8], product_id[16]; |
1607 | |
1608 | idetape_create_inquiry_cmd(&pc); |
1609 | if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) { |
1610 | printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", |
1611 | tape->name); |
1612 | return; |
1613 | } |
1614 | memcpy(vendor_id, &pc_buf[8], 8); |
1615 | memcpy(product_id, &pc_buf[16], 16); |
1616 | memcpy(fw_rev, &pc_buf[32], 4); |
1617 | |
1618 | ide_fixstring(vendor_id, 8, 0); |
1619 | ide_fixstring(product_id, 16, 0); |
1620 | ide_fixstring(fw_rev, 4, 0); |
1621 | |
1622 | printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n", |
1623 | drive->name, tape->name, vendor_id, product_id, fw_rev); |
1624 | } |
1625 | |
1626 | /* |
1627 | * Ask the tape about its various parameters. In particular, we will adjust our |
1628 | * data transfer buffer size to the recommended value as returned by the tape. |
1629 | */ |
1630 | static void idetape_get_mode_sense_results(ide_drive_t *drive) |
1631 | { |
1632 | idetape_tape_t *tape = drive->driver_data; |
1633 | struct ide_atapi_pc pc; |
1634 | u8 buf[24], *caps; |
1635 | u8 speed, max_speed; |
1636 | |
1637 | idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE); |
1638 | if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) { |
1639 | printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming" |
1640 | " some default values\n"); |
1641 | tape->blk_size = 512; |
1642 | put_unaligned(52, (u16 *)&tape->caps[12]); |
1643 | put_unaligned(540, (u16 *)&tape->caps[14]); |
1644 | put_unaligned(6*52, (u16 *)&tape->caps[16]); |
1645 | return; |
1646 | } |
1647 | caps = buf + 4 + buf[3]; |
1648 | |
1649 | /* convert to host order and save for later use */ |
1650 | speed = be16_to_cpup((__be16 *)&caps[14]); |
1651 | max_speed = be16_to_cpup((__be16 *)&caps[8]); |
1652 | |
1653 | *(u16 *)&caps[8] = max_speed; |
1654 | *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]); |
1655 | *(u16 *)&caps[14] = speed; |
1656 | *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]); |
1657 | |
1658 | if (!speed) { |
1659 | printk(KERN_INFO "ide-tape: %s: invalid tape speed " |
1660 | "(assuming 650KB/sec)\n", drive->name); |
1661 | *(u16 *)&caps[14] = 650; |
1662 | } |
1663 | if (!max_speed) { |
1664 | printk(KERN_INFO "ide-tape: %s: invalid max_speed " |
1665 | "(assuming 650KB/sec)\n", drive->name); |
1666 | *(u16 *)&caps[8] = 650; |
1667 | } |
1668 | |
1669 | memcpy(&tape->caps, caps, 20); |
1670 | |
1671 | /* device lacks locking support according to capabilities page */ |
1672 | if ((caps[6] & 1) == 0) |
1673 | drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING; |
1674 | |
1675 | if (caps[7] & 0x02) |
1676 | tape->blk_size = 512; |
1677 | else if (caps[7] & 0x04) |
1678 | tape->blk_size = 1024; |
1679 | } |
1680 | |
1681 | #ifdef CONFIG_IDE_PROC_FS |
1682 | #define ide_tape_devset_get(name, field) \ |
1683 | static int get_##name(ide_drive_t *drive) \ |
1684 | { \ |
1685 | idetape_tape_t *tape = drive->driver_data; \ |
1686 | return tape->field; \ |
1687 | } |
1688 | |
1689 | #define ide_tape_devset_set(name, field) \ |
1690 | static int set_##name(ide_drive_t *drive, int arg) \ |
1691 | { \ |
1692 | idetape_tape_t *tape = drive->driver_data; \ |
1693 | tape->field = arg; \ |
1694 | return 0; \ |
1695 | } |
1696 | |
1697 | #define ide_tape_devset_rw_field(_name, _field) \ |
1698 | ide_tape_devset_get(_name, _field) \ |
1699 | ide_tape_devset_set(_name, _field) \ |
1700 | IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name) |
1701 | |
1702 | #define ide_tape_devset_r_field(_name, _field) \ |
1703 | ide_tape_devset_get(_name, _field) \ |
1704 | IDE_DEVSET(_name, 0, get_##_name, NULL) |
1705 | |
1706 | static int mulf_tdsc(ide_drive_t *drive) { return 1000; } |
1707 | static int divf_tdsc(ide_drive_t *drive) { return HZ; } |
1708 | static int divf_buffer(ide_drive_t *drive) { return 2; } |
1709 | static int divf_buffer_size(ide_drive_t *drive) { return 1024; } |
1710 | |
1711 | ide_devset_rw_flag(dsc_overlap, IDE_DFLAG_DSC_OVERLAP); |
1712 | |
1713 | ide_tape_devset_rw_field(tdsc, best_dsc_rw_freq); |
1714 | |
1715 | ide_tape_devset_r_field(avg_speed, avg_speed); |
1716 | ide_tape_devset_r_field(speed, caps[14]); |
1717 | ide_tape_devset_r_field(buffer, caps[16]); |
1718 | ide_tape_devset_r_field(buffer_size, buffer_size); |
1719 | |
1720 | static const struct ide_proc_devset idetape_settings[] = { |
1721 | __IDE_PROC_DEVSET(avg_speed, 0, 0xffff, NULL, NULL), |
1722 | __IDE_PROC_DEVSET(buffer, 0, 0xffff, NULL, divf_buffer), |
1723 | __IDE_PROC_DEVSET(buffer_size, 0, 0xffff, NULL, divf_buffer_size), |
1724 | __IDE_PROC_DEVSET(dsc_overlap, 0, 1, NULL, NULL), |
1725 | __IDE_PROC_DEVSET(speed, 0, 0xffff, NULL, NULL), |
1726 | __IDE_PROC_DEVSET(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, |
1727 | mulf_tdsc, divf_tdsc), |
1728 | { NULL }, |
1729 | }; |
1730 | #endif |
1731 | |
1732 | /* |
1733 | * The function below is called to: |
1734 | * |
1735 | * 1. Initialize our various state variables. |
1736 | * 2. Ask the tape for its capabilities. |
1737 | * 3. Allocate a buffer which will be used for data transfer. The buffer size |
1738 | * is chosen based on the recommendation which we received in step 2. |
1739 | * |
1740 | * Note that at this point ide.c already assigned us an irq, so that we can |
1741 | * queue requests here and wait for their completion. |
1742 | */ |
1743 | static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor) |
1744 | { |
1745 | unsigned long t; |
1746 | int speed; |
1747 | int buffer_size; |
1748 | u16 *ctl = (u16 *)&tape->caps[12]; |
1749 | |
1750 | ide_debug_log(IDE_DBG_FUNC, "minor: %d", minor); |
1751 | |
1752 | drive->pc_callback = ide_tape_callback; |
1753 | |
1754 | drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; |
1755 | |
1756 | if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) { |
1757 | printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", |
1758 | tape->name); |
1759 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1760 | } |
1761 | |
1762 | /* Seagate Travan drives do not support DSC overlap. */ |
1763 | if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401")) |
1764 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1765 | |
1766 | tape->minor = minor; |
1767 | tape->name[0] = 'h'; |
1768 | tape->name[1] = 't'; |
1769 | tape->name[2] = '0' + minor; |
1770 | tape->chrdev_dir = IDETAPE_DIR_NONE; |
1771 | |
1772 | idetape_get_inquiry_results(drive); |
1773 | idetape_get_mode_sense_results(drive); |
1774 | ide_tape_get_bsize_from_bdesc(drive); |
1775 | tape->user_bs_factor = 1; |
1776 | tape->buffer_size = *ctl * tape->blk_size; |
1777 | while (tape->buffer_size > 0xffff) { |
1778 | printk(KERN_NOTICE "ide-tape: decreasing stage size\n"); |
1779 | *ctl /= 2; |
1780 | tape->buffer_size = *ctl * tape->blk_size; |
1781 | } |
1782 | buffer_size = tape->buffer_size; |
1783 | |
1784 | /* select the "best" DSC read/write polling freq */ |
1785 | speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]); |
1786 | |
1787 | t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000); |
1788 | |
1789 | /* |
1790 | * Ensure that the number we got makes sense; limit it within |
1791 | * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
1792 | */ |
1793 | tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN, |
1794 | IDETAPE_DSC_RW_MAX); |
1795 | printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, " |
1796 | "%lums tDSC%s\n", |
1797 | drive->name, tape->name, *(u16 *)&tape->caps[14], |
1798 | (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size, |
1799 | tape->buffer_size / 1024, |
1800 | tape->best_dsc_rw_freq * 1000 / HZ, |
1801 | (drive->dev_flags & IDE_DFLAG_USING_DMA) ? ", DMA" : ""); |
1802 | |
1803 | ide_proc_register_driver(drive, tape->driver); |
1804 | } |
1805 | |
1806 | static void ide_tape_remove(ide_drive_t *drive) |
1807 | { |
1808 | idetape_tape_t *tape = drive->driver_data; |
1809 | |
1810 | ide_proc_unregister_driver(drive, tape->driver); |
1811 | device_del(&tape->dev); |
1812 | ide_unregister_region(tape->disk); |
1813 | |
1814 | mutex_lock(&idetape_ref_mutex); |
1815 | put_device(&tape->dev); |
1816 | mutex_unlock(&idetape_ref_mutex); |
1817 | } |
1818 | |
1819 | static void ide_tape_release(struct device *dev) |
1820 | { |
1821 | struct ide_tape_obj *tape = to_ide_drv(dev, ide_tape_obj); |
1822 | ide_drive_t *drive = tape->drive; |
1823 | struct gendisk *g = tape->disk; |
1824 | |
1825 | BUG_ON(tape->valid); |
1826 | |
1827 | drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; |
1828 | drive->driver_data = NULL; |
1829 | device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor)); |
1830 | device_destroy(idetape_sysfs_class, |
1831 | MKDEV(IDETAPE_MAJOR, tape->minor + 128)); |
1832 | idetape_devs[tape->minor] = NULL; |
1833 | g->private_data = NULL; |
1834 | put_disk(g); |
1835 | kfree(tape); |
1836 | } |
1837 | |
1838 | #ifdef CONFIG_IDE_PROC_FS |
1839 | static int idetape_name_proc_show(struct seq_file *m, void *v) |
1840 | { |
1841 | ide_drive_t *drive = (ide_drive_t *) m->private; |
1842 | idetape_tape_t *tape = drive->driver_data; |
1843 | |
1844 | seq_printf(m, "%s\n", tape->name); |
1845 | return 0; |
1846 | } |
1847 | |
1848 | static int idetape_name_proc_open(struct inode *inode, struct file *file) |
1849 | { |
1850 | return single_open(file, idetape_name_proc_show, PDE(inode)->data); |
1851 | } |
1852 | |
1853 | static const struct file_operations idetape_name_proc_fops = { |
1854 | .owner = THIS_MODULE, |
1855 | .open = idetape_name_proc_open, |
1856 | .read = seq_read, |
1857 | .llseek = seq_lseek, |
1858 | .release = single_release, |
1859 | }; |
1860 | |
1861 | static ide_proc_entry_t idetape_proc[] = { |
1862 | { "capacity", S_IFREG|S_IRUGO, &ide_capacity_proc_fops }, |
1863 | { "name", S_IFREG|S_IRUGO, &idetape_name_proc_fops }, |
1864 | {} |
1865 | }; |
1866 | |
1867 | static ide_proc_entry_t *ide_tape_proc_entries(ide_drive_t *drive) |
1868 | { |
1869 | return idetape_proc; |
1870 | } |
1871 | |
1872 | static const struct ide_proc_devset *ide_tape_proc_devsets(ide_drive_t *drive) |
1873 | { |
1874 | return idetape_settings; |
1875 | } |
1876 | #endif |
1877 | |
1878 | static int ide_tape_probe(ide_drive_t *); |
1879 | |
1880 | static struct ide_driver idetape_driver = { |
1881 | .gen_driver = { |
1882 | .owner = THIS_MODULE, |
1883 | .name = "ide-tape", |
1884 | .bus = &ide_bus_type, |
1885 | }, |
1886 | .probe = ide_tape_probe, |
1887 | .remove = ide_tape_remove, |
1888 | .version = IDETAPE_VERSION, |
1889 | .do_request = idetape_do_request, |
1890 | #ifdef CONFIG_IDE_PROC_FS |
1891 | .proc_entries = ide_tape_proc_entries, |
1892 | .proc_devsets = ide_tape_proc_devsets, |
1893 | #endif |
1894 | }; |
1895 | |
1896 | /* Our character device supporting functions, passed to register_chrdev. */ |
1897 | static const struct file_operations idetape_fops = { |
1898 | .owner = THIS_MODULE, |
1899 | .read = idetape_chrdev_read, |
1900 | .write = idetape_chrdev_write, |
1901 | .unlocked_ioctl = idetape_chrdev_ioctl, |
1902 | .open = idetape_chrdev_open, |
1903 | .release = idetape_chrdev_release, |
1904 | }; |
1905 | |
1906 | static int idetape_open(struct block_device *bdev, fmode_t mode) |
1907 | { |
1908 | struct ide_tape_obj *tape = ide_tape_get(bdev->bd_disk, false, 0); |
1909 | |
1910 | if (!tape) |
1911 | return -ENXIO; |
1912 | |
1913 | return 0; |
1914 | } |
1915 | |
1916 | static int idetape_release(struct gendisk *disk, fmode_t mode) |
1917 | { |
1918 | struct ide_tape_obj *tape = ide_drv_g(disk, ide_tape_obj); |
1919 | |
1920 | ide_tape_put(tape); |
1921 | return 0; |
1922 | } |
1923 | |
1924 | static int idetape_ioctl(struct block_device *bdev, fmode_t mode, |
1925 | unsigned int cmd, unsigned long arg) |
1926 | { |
1927 | struct ide_tape_obj *tape = ide_drv_g(bdev->bd_disk, ide_tape_obj); |
1928 | ide_drive_t *drive = tape->drive; |
1929 | int err = generic_ide_ioctl(drive, bdev, cmd, arg); |
1930 | if (err == -EINVAL) |
1931 | err = idetape_blkdev_ioctl(drive, cmd, arg); |
1932 | return err; |
1933 | } |
1934 | |
1935 | static const struct block_device_operations idetape_block_ops = { |
1936 | .owner = THIS_MODULE, |
1937 | .open = idetape_open, |
1938 | .release = idetape_release, |
1939 | .locked_ioctl = idetape_ioctl, |
1940 | }; |
1941 | |
1942 | static int ide_tape_probe(ide_drive_t *drive) |
1943 | { |
1944 | idetape_tape_t *tape; |
1945 | struct gendisk *g; |
1946 | int minor; |
1947 | |
1948 | ide_debug_log(IDE_DBG_FUNC, "enter"); |
1949 | |
1950 | if (!strstr(DRV_NAME, drive->driver_req)) |
1951 | goto failed; |
1952 | |
1953 | if (drive->media != ide_tape) |
1954 | goto failed; |
1955 | |
1956 | if ((drive->dev_flags & IDE_DFLAG_ID_READ) && |
1957 | ide_check_atapi_device(drive, DRV_NAME) == 0) { |
1958 | printk(KERN_ERR "ide-tape: %s: not supported by this version of" |
1959 | " the driver\n", drive->name); |
1960 | goto failed; |
1961 | } |
1962 | tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL); |
1963 | if (tape == NULL) { |
1964 | printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n", |
1965 | drive->name); |
1966 | goto failed; |
1967 | } |
1968 | |
1969 | g = alloc_disk(1 << PARTN_BITS); |
1970 | if (!g) |
1971 | goto out_free_tape; |
1972 | |
1973 | ide_init_disk(g, drive); |
1974 | |
1975 | tape->dev.parent = &drive->gendev; |
1976 | tape->dev.release = ide_tape_release; |
1977 | dev_set_name(&tape->dev, dev_name(&drive->gendev)); |
1978 | |
1979 | if (device_register(&tape->dev)) |
1980 | goto out_free_disk; |
1981 | |
1982 | tape->drive = drive; |
1983 | tape->driver = &idetape_driver; |
1984 | tape->disk = g; |
1985 | |
1986 | g->private_data = &tape->driver; |
1987 | |
1988 | drive->driver_data = tape; |
1989 | |
1990 | mutex_lock(&idetape_ref_mutex); |
1991 | for (minor = 0; idetape_devs[minor]; minor++) |
1992 | ; |
1993 | idetape_devs[minor] = tape; |
1994 | mutex_unlock(&idetape_ref_mutex); |
1995 | |
1996 | idetape_setup(drive, tape, minor); |
1997 | |
1998 | device_create(idetape_sysfs_class, &drive->gendev, |
1999 | MKDEV(IDETAPE_MAJOR, minor), NULL, "%s", tape->name); |
2000 | device_create(idetape_sysfs_class, &drive->gendev, |
2001 | MKDEV(IDETAPE_MAJOR, minor + 128), NULL, |
2002 | "n%s", tape->name); |
2003 | |
2004 | g->fops = &idetape_block_ops; |
2005 | ide_register_region(g); |
2006 | |
2007 | return 0; |
2008 | |
2009 | out_free_disk: |
2010 | put_disk(g); |
2011 | out_free_tape: |
2012 | kfree(tape); |
2013 | failed: |
2014 | return -ENODEV; |
2015 | } |
2016 | |
2017 | static void __exit idetape_exit(void) |
2018 | { |
2019 | driver_unregister(&idetape_driver.gen_driver); |
2020 | class_destroy(idetape_sysfs_class); |
2021 | unregister_chrdev(IDETAPE_MAJOR, "ht"); |
2022 | } |
2023 | |
2024 | static int __init idetape_init(void) |
2025 | { |
2026 | int error = 1; |
2027 | idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape"); |
2028 | if (IS_ERR(idetape_sysfs_class)) { |
2029 | idetape_sysfs_class = NULL; |
2030 | printk(KERN_ERR "Unable to create sysfs class for ide tapes\n"); |
2031 | error = -EBUSY; |
2032 | goto out; |
2033 | } |
2034 | |
2035 | if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) { |
2036 | printk(KERN_ERR "ide-tape: Failed to register chrdev" |
2037 | " interface\n"); |
2038 | error = -EBUSY; |
2039 | goto out_free_class; |
2040 | } |
2041 | |
2042 | error = driver_register(&idetape_driver.gen_driver); |
2043 | if (error) |
2044 | goto out_free_driver; |
2045 | |
2046 | return 0; |
2047 | |
2048 | out_free_driver: |
2049 | driver_unregister(&idetape_driver.gen_driver); |
2050 | out_free_class: |
2051 | class_destroy(idetape_sysfs_class); |
2052 | out: |
2053 | return error; |
2054 | } |
2055 | |
2056 | MODULE_ALIAS("ide:*m-tape*"); |
2057 | module_init(idetape_init); |
2058 | module_exit(idetape_exit); |
2059 | MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR); |
2060 | MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
2061 | MODULE_LICENSE("GPL"); |
2062 |
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