2 * IDE ATAPI streaming tape driver.
4 * Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
5 * Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
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.
11 * It is hereby placed under the terms of the GNU general public license.
12 * (See linux/COPYING).
14 * For a historical changelog see
15 * Documentation/ide/ChangeLog.ide-tape.1995-2002
18 #define DRV_NAME "ide-tape"
20 #define IDETAPE_VERSION "1.20"
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>
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>
43 #include <asm/byteorder.h>
44 #include <linux/irq.h>
45 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/mtio.h>
51 /* output errors only */
53 /* output all sense key/asc */
55 /* info regarding all chrdev-related procedures */
56 DBG_CHRDEV
= (1 << 2),
57 /* all remaining procedures */
61 /* define to see debug info */
62 #define IDETAPE_DEBUG_LOG 0
65 #define debug_log(lvl, fmt, args...) \
67 if (tape->debug_mask & lvl) \
68 printk(KERN_INFO "ide-tape: " fmt, ## args); \
71 #define debug_log(lvl, fmt, args...) do {} while (0)
74 /**************************** Tunable parameters *****************************/
76 * After each failed packet command we issue a request sense command and retry
77 * the packet command IDETAPE_MAX_PC_RETRIES times.
79 * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
81 #define IDETAPE_MAX_PC_RETRIES 3
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.
89 #define IDETAPE_FIFO_THRESHOLD 2
92 * DSC polling parameters.
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:
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.
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).
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.
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 */
125 /*************************** End of tunable parameters ***********************/
127 /* tape directions */
129 IDETAPE_DIR_NONE
= (1 << 0),
130 IDETAPE_DIR_READ
= (1 << 1),
131 IDETAPE_DIR_WRITE
= (1 << 2),
134 /* Tape door status */
135 #define DOOR_UNLOCKED 0
136 #define DOOR_LOCKED 1
137 #define DOOR_EXPLICITLY_LOCKED 2
139 /* Some defines for the SPACE command */
140 #define IDETAPE_SPACE_OVER_FILEMARK 1
141 #define IDETAPE_SPACE_TO_EOD 3
143 /* Some defines for the LOAD UNLOAD command */
144 #define IDETAPE_LU_LOAD_MASK 1
145 #define IDETAPE_LU_RETENSION_MASK 2
146 #define IDETAPE_LU_EOT_MASK 4
148 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
149 #define IDETAPE_BLOCK_DESCRIPTOR 0
150 #define IDETAPE_CAPABILITIES_PAGE 0x2a
153 * Most of our global data which we need to save even as we leave the driver due
154 * to an interrupt or a timer event is stored in the struct defined below.
156 typedef struct ide_tape_obj
{
158 struct ide_driver
*driver
;
159 struct gendisk
*disk
;
162 /* used by REQ_IDETAPE_{READ,WRITE} requests */
163 struct ide_atapi_pc queued_pc
;
166 * DSC polling variables.
168 * While polling for DSC we use postponed_rq to postpone the current
169 * request so that ide.c will be able to service pending requests on the
170 * other device. Note that at most we will have only one DSC (usually
171 * data transfer) request in the device request queue.
173 struct request
*postponed_rq
;
174 /* The time in which we started polling for DSC */
175 unsigned long dsc_polling_start
;
176 /* Timer used to poll for dsc */
177 struct timer_list dsc_timer
;
178 /* Read/Write dsc polling frequency */
179 unsigned long best_dsc_rw_freq
;
180 unsigned long dsc_poll_freq
;
181 unsigned long dsc_timeout
;
183 /* Read position information */
186 unsigned int first_frame
;
188 /* Last error information */
189 u8 sense_key
, asc
, ascq
;
191 /* Character device operation */
195 /* Current character device data transfer direction */
198 /* tape block size, usually 512 or 1024 bytes */
199 unsigned short blk_size
;
202 /* Copy of the tape's Capabilities and Mechanical Page */
206 * Active data transfer request parameters.
208 * At most, there is only one ide-tape originated data transfer request
209 * in the device request queue. This allows ide.c to easily service
210 * requests from the other device when we postpone our active request.
213 /* Data buffer size chosen based on the tape's recommendation */
215 /* Staging buffer of buffer_size bytes */
217 /* The read/write cursor */
219 /* The number of valid bytes in buf */
222 /* Measures average tape speed */
223 unsigned long avg_time
;
227 /* the door is currently locked */
229 /* the tape hardware is write protected */
231 /* the tape is write protected (hardware or opened as read-only) */
237 static DEFINE_MUTEX(idetape_ref_mutex
);
239 static struct class *idetape_sysfs_class
;
241 static void ide_tape_release(struct device
*);
243 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
245 struct ide_tape_obj
*tape
= NULL
;
247 mutex_lock(&idetape_ref_mutex
);
248 tape
= ide_drv_g(disk
, ide_tape_obj
);
250 if (ide_device_get(tape
->drive
))
253 get_device(&tape
->dev
);
255 mutex_unlock(&idetape_ref_mutex
);
259 static void ide_tape_put(struct ide_tape_obj
*tape
)
261 ide_drive_t
*drive
= tape
->drive
;
263 mutex_lock(&idetape_ref_mutex
);
264 put_device(&tape
->dev
);
265 ide_device_put(drive
);
266 mutex_unlock(&idetape_ref_mutex
);
270 * The variables below are used for the character device interface. Additional
271 * state variables are defined in our ide_drive_t structure.
273 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
275 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
277 struct ide_tape_obj
*tape
= NULL
;
279 mutex_lock(&idetape_ref_mutex
);
280 tape
= idetape_devs
[i
];
282 get_device(&tape
->dev
);
283 mutex_unlock(&idetape_ref_mutex
);
288 * called on each failed packet command retry to analyze the request sense. We
289 * currently do not utilize this information.
291 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
293 idetape_tape_t
*tape
= drive
->driver_data
;
294 struct ide_atapi_pc
*pc
= drive
->failed_pc
;
296 tape
->sense_key
= sense
[2] & 0xF;
297 tape
->asc
= sense
[12];
298 tape
->ascq
= sense
[13];
300 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
301 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
303 /* Correct pc->xferred by asking the tape. */
304 if (pc
->flags
& PC_FLAG_DMA_ERROR
)
305 pc
->xferred
= pc
->req_xfer
-
307 get_unaligned_be32(&sense
[3]);
310 * If error was the result of a zero-length read or write command,
311 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
312 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
314 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
316 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
317 if (tape
->sense_key
== 5) {
318 /* don't report an error, everything's ok */
320 /* don't retry read/write */
321 pc
->flags
|= PC_FLAG_ABORT
;
324 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
325 pc
->error
= IDE_DRV_ERROR_FILEMARK
;
326 pc
->flags
|= PC_FLAG_ABORT
;
328 if (pc
->c
[0] == WRITE_6
) {
329 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
330 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
331 pc
->error
= IDE_DRV_ERROR_EOD
;
332 pc
->flags
|= PC_FLAG_ABORT
;
335 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
336 if (tape
->sense_key
== 8) {
337 pc
->error
= IDE_DRV_ERROR_EOD
;
338 pc
->flags
|= PC_FLAG_ABORT
;
340 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
342 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
346 static void ide_tape_handle_dsc(ide_drive_t
*);
348 static int ide_tape_callback(ide_drive_t
*drive
, int dsc
)
350 idetape_tape_t
*tape
= drive
->driver_data
;
351 struct ide_atapi_pc
*pc
= drive
->pc
;
352 struct request
*rq
= drive
->hwif
->rq
;
353 int uptodate
= pc
->error
? 0 : 1;
354 int err
= uptodate
? 0 : IDE_DRV_ERROR_GENERAL
;
356 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
359 ide_tape_handle_dsc(drive
);
361 if (drive
->failed_pc
== pc
)
362 drive
->failed_pc
= NULL
;
364 if (pc
->c
[0] == REQUEST_SENSE
) {
366 idetape_analyze_error(drive
, pc
->buf
);
368 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE "
369 "itself - Aborting request!\n");
370 } else if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
371 int blocks
= pc
->xferred
/ tape
->blk_size
;
373 tape
->avg_size
+= blocks
* tape
->blk_size
;
375 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
376 tape
->avg_speed
= tape
->avg_size
* HZ
/
377 (jiffies
- tape
->avg_time
) / 1024;
379 tape
->avg_time
= jiffies
;
382 tape
->first_frame
+= blocks
;
383 rq
->resid_len
-= blocks
* tape
->blk_size
;
389 } else if (pc
->c
[0] == READ_POSITION
&& uptodate
) {
390 u8
*readpos
= pc
->buf
;
392 debug_log(DBG_SENSE
, "BOP - %s\n",
393 (readpos
[0] & 0x80) ? "Yes" : "No");
394 debug_log(DBG_SENSE
, "EOP - %s\n",
395 (readpos
[0] & 0x40) ? "Yes" : "No");
397 if (readpos
[0] & 0x4) {
398 printk(KERN_INFO
"ide-tape: Block location is unknown"
400 clear_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
402 err
= IDE_DRV_ERROR_GENERAL
;
404 debug_log(DBG_SENSE
, "Block Location - %u\n",
405 be32_to_cpup((__be32
*)&readpos
[4]));
407 tape
->partition
= readpos
[1];
408 tape
->first_frame
= be32_to_cpup((__be32
*)&readpos
[4]);
409 set_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
419 * Postpone the current request so that ide.c will be able to service requests
420 * from another device on the same port while we are polling for DSC.
422 static void idetape_postpone_request(ide_drive_t
*drive
)
424 idetape_tape_t
*tape
= drive
->driver_data
;
426 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
428 tape
->postponed_rq
= drive
->hwif
->rq
;
430 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
433 static void ide_tape_handle_dsc(ide_drive_t
*drive
)
435 idetape_tape_t
*tape
= drive
->driver_data
;
437 /* Media access command */
438 tape
->dsc_polling_start
= jiffies
;
439 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
440 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
441 /* Allow ide.c to handle other requests */
442 idetape_postpone_request(drive
);
446 * Packet Command Interface
448 * The current Packet Command is available in drive->pc, and will not change
449 * until we finish handling it. Each packet command is associated with a
450 * callback function that will be called when the command is finished.
452 * The handling will be done in three stages:
454 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
455 * the interrupt handler to ide_pc_intr.
457 * 2. On each interrupt, ide_pc_intr will be called. This step will be
458 * repeated until the device signals us that no more interrupts will be issued.
460 * 3. ATAPI Tape media access commands have immediate status with a delayed
461 * process. In case of a successful initiation of a media access packet command,
462 * the DSC bit will be set when the actual execution of the command is finished.
463 * Since the tape drive will not issue an interrupt, we have to poll for this
464 * event. In this case, we define the request as "low priority request" by
465 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
468 * ide.c will then give higher priority to requests which originate from the
469 * other device, until will change rq_status to RQ_ACTIVE.
471 * 4. When the packet command is finished, it will be checked for errors.
473 * 5. In case an error was found, we queue a request sense packet command in
474 * front of the request queue and retry the operation up to
475 * IDETAPE_MAX_PC_RETRIES times.
477 * 6. In case no error was found, or we decided to give up and not to retry
478 * again, the callback function will be called and then we will handle the next
482 static ide_startstop_t
ide_tape_issue_pc(ide_drive_t
*drive
,
484 struct ide_atapi_pc
*pc
)
486 idetape_tape_t
*tape
= drive
->driver_data
;
488 if (drive
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
489 drive
->failed_pc
= pc
;
491 /* Set the current packet command */
494 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
495 (pc
->flags
& PC_FLAG_ABORT
)) {
496 unsigned int done
= blk_rq_bytes(drive
->hwif
->rq
);
499 * We will "abort" retrying a packet command in case legitimate
500 * error code was received (crossing a filemark, or end of the
501 * media, for example).
503 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
504 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
505 tape
->sense_key
== 2 && tape
->asc
== 4 &&
506 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
507 printk(KERN_ERR
"ide-tape: %s: I/O error, "
508 "pc = %2x, key = %2x, "
509 "asc = %2x, ascq = %2x\n",
510 tape
->name
, pc
->c
[0],
511 tape
->sense_key
, tape
->asc
,
515 pc
->error
= IDE_DRV_ERROR_GENERAL
;
518 drive
->failed_pc
= NULL
;
519 drive
->pc_callback(drive
, 0);
520 ide_complete_rq(drive
, -EIO
, done
);
523 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
527 return ide_issue_pc(drive
, cmd
);
530 /* A mode sense command is used to "sense" tape parameters. */
531 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
534 pc
->c
[0] = MODE_SENSE
;
535 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
536 /* DBD = 1 - Don't return block descriptors */
538 pc
->c
[2] = page_code
;
540 * Changed pc->c[3] to 0 (255 will at best return unused info).
542 * For SCSI this byte is defined as subpage instead of high byte
543 * of length and some IDE drives seem to interpret it this way
544 * and return an error when 255 is used.
547 /* We will just discard data in that case */
549 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
551 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
557 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
559 ide_hwif_t
*hwif
= drive
->hwif
;
560 idetape_tape_t
*tape
= drive
->driver_data
;
561 struct ide_atapi_pc
*pc
= drive
->pc
;
564 stat
= hwif
->tp_ops
->read_status(hwif
);
566 if (stat
& ATA_DSC
) {
567 if (stat
& ATA_ERR
) {
569 if (pc
->c
[0] != TEST_UNIT_READY
)
570 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
572 /* Retry operation */
578 pc
->error
= IDE_DRV_ERROR_GENERAL
;
579 drive
->failed_pc
= NULL
;
581 drive
->pc_callback(drive
, 0);
585 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
586 struct ide_atapi_pc
*pc
, struct request
*rq
,
589 unsigned int length
= blk_rq_sectors(rq
);
592 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
595 pc
->buf_size
= length
* tape
->blk_size
;
596 pc
->req_xfer
= pc
->buf_size
;
597 if (pc
->req_xfer
== tape
->buffer_size
)
598 pc
->flags
|= PC_FLAG_DMA_OK
;
600 if (opcode
== READ_6
)
602 else if (opcode
== WRITE_6
) {
604 pc
->flags
|= PC_FLAG_WRITING
;
607 memcpy(rq
->cmd
, pc
->c
, 12);
610 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
611 struct request
*rq
, sector_t block
)
613 ide_hwif_t
*hwif
= drive
->hwif
;
614 idetape_tape_t
*tape
= drive
->driver_data
;
615 struct ide_atapi_pc
*pc
= NULL
;
616 struct request
*postponed_rq
= tape
->postponed_rq
;
620 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %u\n"
621 (unsigned long long)blk_rq_pos(rq
), blk_rq_sectors(rq
));
623 if (!(blk_special_request(rq
) || blk_sense_request(rq
))) {
624 /* We do not support buffer cache originated requests. */
625 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
626 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
627 if (blk_fs_request(rq
) == 0 && rq
->errors
== 0)
629 ide_complete_rq(drive
, -EIO
, ide_rq_bytes(rq
));
633 /* Retry a failed packet command */
634 if (drive
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
635 pc
= drive
->failed_pc
;
639 if (postponed_rq
!= NULL
)
640 if (rq
!= postponed_rq
) {
641 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
642 "Two DSC requests were queued\n");
643 drive
->failed_pc
= NULL
;
645 ide_complete_rq(drive
, 0, blk_rq_bytes(rq
));
649 tape
->postponed_rq
= NULL
;
652 * If the tape is still busy, postpone our request and service
653 * the other device meanwhile.
655 stat
= hwif
->tp_ops
->read_status(hwif
);
657 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
658 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
659 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
661 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
662 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
663 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
666 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
667 (stat
& ATA_DSC
) == 0) {
668 if (postponed_rq
== NULL
) {
669 tape
->dsc_polling_start
= jiffies
;
670 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
671 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
672 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
673 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
675 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
676 idetape_media_access_finished(drive
);
679 return ide_do_reset(drive
);
681 } else if (time_after(jiffies
,
682 tape
->dsc_polling_start
+
683 IDETAPE_DSC_MA_THRESHOLD
))
684 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
685 idetape_postpone_request(drive
);
688 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
689 pc
= &tape
->queued_pc
;
690 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
693 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
694 pc
= &tape
->queued_pc
;
695 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
698 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
699 pc
= (struct ide_atapi_pc
*)rq
->special
;
700 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
701 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
704 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
705 idetape_media_access_finished(drive
);
711 /* prepare sense request for this command */
712 ide_prep_sense(drive
, rq
);
714 memset(&cmd
, 0, sizeof(cmd
));
717 cmd
.tf_flags
|= IDE_TFLAG_WRITE
;
721 ide_init_sg_cmd(&cmd
, pc
->req_xfer
);
722 ide_map_sg(drive
, &cmd
);
724 return ide_tape_issue_pc(drive
, &cmd
, pc
);
728 * Write a filemark if write_filemark=1. Flush the device buffers without
729 * writing a filemark otherwise.
731 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
732 struct ide_atapi_pc
*pc
, int write_filemark
)
735 pc
->c
[0] = WRITE_FILEMARKS
;
736 pc
->c
[4] = write_filemark
;
737 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
740 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
742 idetape_tape_t
*tape
= drive
->driver_data
;
743 struct gendisk
*disk
= tape
->disk
;
744 int load_attempted
= 0;
746 /* Wait for the tape to become ready */
747 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
749 while (time_before(jiffies
, timeout
)) {
750 if (ide_do_test_unit_ready(drive
, disk
) == 0)
752 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
753 || (tape
->asc
== 0x3A)) {
757 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
759 /* not about to be ready */
760 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
761 (tape
->ascq
== 1 || tape
->ascq
== 8)))
768 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
770 struct ide_tape_obj
*tape
= drive
->driver_data
;
771 struct ide_atapi_pc pc
;
774 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
775 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
778 idetape_wait_ready(drive
, 60 * 5 * HZ
);
782 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
785 pc
->c
[0] = READ_POSITION
;
789 static int idetape_read_position(ide_drive_t
*drive
)
791 idetape_tape_t
*tape
= drive
->driver_data
;
792 struct ide_atapi_pc pc
;
795 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
797 idetape_create_read_position_cmd(&pc
);
798 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
800 position
= tape
->first_frame
;
804 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
805 struct ide_atapi_pc
*pc
,
806 unsigned int block
, u8 partition
, int skip
)
809 pc
->c
[0] = POSITION_TO_ELEMENT
;
811 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
812 pc
->c
[8] = partition
;
813 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
816 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
818 idetape_tape_t
*tape
= drive
->driver_data
;
820 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
823 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
825 if (tape
->buf
!= NULL
) {
830 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
834 * Position the tape to the requested block using the LOCATE packet command.
835 * A READ POSITION command is then issued to check where we are positioned. Like
836 * all higher level operations, we queue the commands at the tail of the request
837 * queue and wait for their completion.
839 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
840 u8 partition
, int skip
)
842 idetape_tape_t
*tape
= drive
->driver_data
;
843 struct gendisk
*disk
= tape
->disk
;
845 struct ide_atapi_pc pc
;
847 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
848 __ide_tape_discard_merge_buffer(drive
);
849 idetape_wait_ready(drive
, 60 * 5 * HZ
);
850 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
851 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
855 idetape_create_read_position_cmd(&pc
);
856 return ide_queue_pc_tail(drive
, disk
, &pc
);
859 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
860 int restore_position
)
862 idetape_tape_t
*tape
= drive
->driver_data
;
865 __ide_tape_discard_merge_buffer(drive
);
866 if (restore_position
) {
867 position
= idetape_read_position(drive
);
868 seek
= position
> 0 ? position
: 0;
869 if (idetape_position_tape(drive
, seek
, 0, 0)) {
870 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
871 " %s\n", tape
->name
, __func__
);
878 * Generate a read/write request for the block device interface and wait for it
881 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int size
)
883 idetape_tape_t
*tape
= drive
->driver_data
;
887 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
888 BUG_ON(cmd
!= REQ_IDETAPE_READ
&& cmd
!= REQ_IDETAPE_WRITE
);
889 BUG_ON(size
< 0 || size
% tape
->blk_size
);
891 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
892 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
894 rq
->rq_disk
= tape
->disk
;
895 rq
->__sector
= tape
->first_frame
;
898 ret
= blk_rq_map_kern(drive
->queue
, rq
, tape
->buf
, size
,
904 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
906 /* calculate the number of transferred bytes and update buffer state */
907 size
-= rq
->resid_len
;
908 tape
->cur
= tape
->buf
;
909 if (cmd
== REQ_IDETAPE_READ
)
915 if (rq
->errors
== IDE_DRV_ERROR_GENERAL
)
922 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
930 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
931 struct ide_atapi_pc
*pc
)
934 pc
->c
[0] = REZERO_UNIT
;
935 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
938 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
943 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
946 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
950 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
952 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
955 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
957 idetape_tape_t
*tape
= drive
->driver_data
;
959 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
960 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
961 " but we are not writing.\n");
965 size_t aligned
= roundup(tape
->valid
, tape
->blk_size
);
967 memset(tape
->cur
, 0, aligned
- tape
->valid
);
968 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, aligned
);
972 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
975 static int idetape_init_rw(ide_drive_t
*drive
, int dir
)
977 idetape_tape_t
*tape
= drive
->driver_data
;
980 BUG_ON(dir
!= IDETAPE_DIR_READ
&& dir
!= IDETAPE_DIR_WRITE
);
982 if (tape
->chrdev_dir
== dir
)
985 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
986 ide_tape_discard_merge_buffer(drive
, 1);
987 else if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
988 ide_tape_flush_merge_buffer(drive
);
989 idetape_flush_tape_buffers(drive
);
992 if (tape
->buf
|| tape
->valid
) {
993 printk(KERN_ERR
"ide-tape: valid should be 0 now\n");
997 tape
->buf
= kmalloc(tape
->buffer_size
, GFP_KERNEL
);
1000 tape
->chrdev_dir
= dir
;
1001 tape
->cur
= tape
->buf
;
1004 * Issue a 0 rw command to ensure that DSC handshake is
1005 * switched from completion mode to buffer available mode. No
1006 * point in issuing this if DSC overlap isn't supported, some
1007 * drives (Seagate STT3401A) will return an error.
1009 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1010 int cmd
= dir
== IDETAPE_DIR_READ
? REQ_IDETAPE_READ
1011 : REQ_IDETAPE_WRITE
;
1013 rc
= idetape_queue_rw_tail(drive
, cmd
, 0);
1017 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1025 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1027 idetape_tape_t
*tape
= drive
->driver_data
;
1029 memset(tape
->buf
, 0, tape
->buffer_size
);
1032 unsigned int count
= min(tape
->buffer_size
, bcount
);
1034 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, count
);
1040 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1041 * currently support only one partition.
1043 static int idetape_rewind_tape(ide_drive_t
*drive
)
1045 struct ide_tape_obj
*tape
= drive
->driver_data
;
1046 struct gendisk
*disk
= tape
->disk
;
1048 struct ide_atapi_pc pc
;
1050 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1052 idetape_create_rewind_cmd(drive
, &pc
);
1053 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1057 idetape_create_read_position_cmd(&pc
);
1058 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1064 /* mtio.h compatible commands should be issued to the chrdev interface. */
1065 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1068 idetape_tape_t
*tape
= drive
->driver_data
;
1069 void __user
*argp
= (void __user
*)arg
;
1071 struct idetape_config
{
1072 int dsc_rw_frequency
;
1073 int dsc_media_access_frequency
;
1077 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1081 if (copy_from_user(&config
, argp
, sizeof(config
)))
1083 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1086 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1087 config
.nr_stages
= 1;
1088 if (copy_to_user(argp
, &config
, sizeof(config
)))
1097 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1100 idetape_tape_t
*tape
= drive
->driver_data
;
1101 struct gendisk
*disk
= tape
->disk
;
1102 struct ide_atapi_pc pc
;
1103 int retval
, count
= 0;
1104 int sprev
= !!(tape
->caps
[4] & 0x20);
1108 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1111 mt_count
= -mt_count
;
1114 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1116 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1118 ide_tape_discard_merge_buffer(drive
, 0);
1124 idetape_create_space_cmd(&pc
, mt_count
- count
,
1125 IDETAPE_SPACE_OVER_FILEMARK
);
1126 return ide_queue_pc_tail(drive
, disk
, &pc
);
1131 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1135 count
= (MTBSFM
== mt_op
? 1 : -1);
1136 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1138 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1145 * Our character device read / write functions.
1147 * The tape is optimized to maximize throughput when it is transferring an
1148 * integral number of the "continuous transfer limit", which is a parameter of
1149 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1151 * As of version 1.3 of the driver, the character device provides an abstract
1152 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1153 * same backup/restore procedure is supported. The driver will internally
1154 * convert the requests to the recommended transfer unit, so that an unmatch
1155 * between the user's block size to the recommended size will only result in a
1156 * (slightly) increased driver overhead, but will no longer hit performance.
1157 * This is not applicable to Onstream.
1159 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1160 size_t count
, loff_t
*ppos
)
1162 struct ide_tape_obj
*tape
= file
->private_data
;
1163 ide_drive_t
*drive
= tape
->drive
;
1168 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1170 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1171 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1172 if (count
> tape
->blk_size
&&
1173 (count
% tape
->blk_size
) == 0)
1174 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1177 rc
= idetape_init_rw(drive
, IDETAPE_DIR_READ
);
1181 while (done
< count
) {
1184 /* refill if staging buffer is empty */
1186 /* If we are at a filemark, nothing more to read */
1187 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1190 if (idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
,
1191 tape
->buffer_size
) <= 0)
1196 todo
= min_t(size_t, count
- done
, tape
->valid
);
1197 if (copy_to_user(buf
+ done
, tape
->cur
, todo
))
1201 tape
->valid
-= todo
;
1205 if (!done
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1206 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1208 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1212 return ret
? ret
: done
;
1215 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1216 size_t count
, loff_t
*ppos
)
1218 struct ide_tape_obj
*tape
= file
->private_data
;
1219 ide_drive_t
*drive
= tape
->drive
;
1224 /* The drive is write protected. */
1225 if (tape
->write_prot
)
1228 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1230 /* Initialize write operation */
1231 rc
= idetape_init_rw(drive
, IDETAPE_DIR_WRITE
);
1235 while (done
< count
) {
1238 /* flush if staging buffer is full */
1239 if (tape
->valid
== tape
->buffer_size
&&
1240 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1241 tape
->buffer_size
) <= 0)
1245 todo
= min_t(size_t, count
- done
,
1246 tape
->buffer_size
- tape
->valid
);
1247 if (copy_from_user(tape
->cur
, buf
+ done
, todo
))
1251 tape
->valid
+= todo
;
1255 return ret
? ret
: done
;
1258 static int idetape_write_filemark(ide_drive_t
*drive
)
1260 struct ide_tape_obj
*tape
= drive
->driver_data
;
1261 struct ide_atapi_pc pc
;
1263 /* Write a filemark */
1264 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1265 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1266 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1273 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1276 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1277 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1278 * usually not supported.
1280 * The following commands are currently not supported:
1282 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1283 * MT_ST_WRITE_THRESHOLD.
1285 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1287 idetape_tape_t
*tape
= drive
->driver_data
;
1288 struct gendisk
*disk
= tape
->disk
;
1289 struct ide_atapi_pc pc
;
1292 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1302 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1309 if (tape
->write_prot
)
1311 ide_tape_discard_merge_buffer(drive
, 1);
1312 for (i
= 0; i
< mt_count
; i
++) {
1313 retval
= idetape_write_filemark(drive
);
1319 ide_tape_discard_merge_buffer(drive
, 0);
1320 if (idetape_rewind_tape(drive
))
1324 ide_tape_discard_merge_buffer(drive
, 0);
1325 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1329 * If door is locked, attempt to unlock before
1330 * attempting to eject.
1332 if (tape
->door_locked
) {
1333 if (!ide_set_media_lock(drive
, disk
, 0))
1334 tape
->door_locked
= DOOR_UNLOCKED
;
1336 ide_tape_discard_merge_buffer(drive
, 0);
1337 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1339 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1342 ide_tape_discard_merge_buffer(drive
, 0);
1343 return idetape_flush_tape_buffers(drive
);
1345 ide_tape_discard_merge_buffer(drive
, 0);
1346 return ide_do_start_stop(drive
, disk
,
1347 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1349 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1350 return ide_queue_pc_tail(drive
, disk
, &pc
);
1352 (void)idetape_rewind_tape(drive
);
1353 idetape_create_erase_cmd(&pc
);
1354 return ide_queue_pc_tail(drive
, disk
, &pc
);
1357 if (mt_count
< tape
->blk_size
||
1358 mt_count
% tape
->blk_size
)
1360 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1361 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1363 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1366 ide_tape_discard_merge_buffer(drive
, 0);
1367 return idetape_position_tape(drive
,
1368 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1370 ide_tape_discard_merge_buffer(drive
, 0);
1371 return idetape_position_tape(drive
, 0, mt_count
, 0);
1375 retval
= ide_set_media_lock(drive
, disk
, 1);
1378 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1381 retval
= ide_set_media_lock(drive
, disk
, 0);
1384 tape
->door_locked
= DOOR_UNLOCKED
;
1387 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1394 * Our character device ioctls. General mtio.h magnetic io commands are
1395 * supported here, and not in the corresponding block interface. Our own
1396 * ide-tape ioctls are supported on both interfaces.
1398 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1399 unsigned int cmd
, unsigned long arg
)
1401 struct ide_tape_obj
*tape
= file
->private_data
;
1402 ide_drive_t
*drive
= tape
->drive
;
1406 int block_offset
= 0, position
= tape
->first_frame
;
1407 void __user
*argp
= (void __user
*)arg
;
1409 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1411 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1412 ide_tape_flush_merge_buffer(drive
);
1413 idetape_flush_tape_buffers(drive
);
1415 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1416 block_offset
= tape
->valid
/
1417 (tape
->blk_size
* tape
->user_bs_factor
);
1418 position
= idetape_read_position(drive
);
1424 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1426 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1428 memset(&mtget
, 0, sizeof(struct mtget
));
1429 mtget
.mt_type
= MT_ISSCSI2
;
1430 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1432 ((tape
->blk_size
* tape
->user_bs_factor
)
1433 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1435 if (tape
->drv_write_prot
)
1436 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1438 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1442 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1443 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1447 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1448 ide_tape_discard_merge_buffer(drive
, 1);
1449 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1454 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1455 * block size with the reported value.
1457 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1459 idetape_tape_t
*tape
= drive
->driver_data
;
1460 struct ide_atapi_pc pc
;
1462 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1463 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1464 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1465 if (tape
->blk_size
== 0) {
1466 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1467 "block size, assuming 32k\n");
1468 tape
->blk_size
= 32768;
1472 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1473 (pc
.buf
[4 + 6] << 8) +
1475 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1478 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1480 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1482 idetape_tape_t
*tape
;
1485 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1489 tape
= ide_tape_chrdev_get(i
);
1495 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1498 * We really want to do nonseekable_open(inode, filp); here, but some
1499 * versions of tar incorrectly call lseek on tapes and bail out if that
1500 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1502 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1504 drive
= tape
->drive
;
1506 filp
->private_data
= tape
;
1508 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1513 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1515 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1516 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1520 idetape_read_position(drive
);
1521 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1522 (void)idetape_rewind_tape(drive
);
1524 /* Read block size and write protect status from drive. */
1525 ide_tape_get_bsize_from_bdesc(drive
);
1527 /* Set write protect flag if device is opened as read-only. */
1528 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1529 tape
->write_prot
= 1;
1531 tape
->write_prot
= tape
->drv_write_prot
;
1533 /* Make sure drive isn't write protected if user wants to write. */
1534 if (tape
->write_prot
) {
1535 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1536 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1537 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1543 /* Lock the tape drive door so user can't eject. */
1544 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1545 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1546 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1547 tape
->door_locked
= DOOR_LOCKED
;
1559 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1561 idetape_tape_t
*tape
= drive
->driver_data
;
1563 ide_tape_flush_merge_buffer(drive
);
1564 tape
->buf
= kmalloc(tape
->buffer_size
, GFP_KERNEL
);
1565 if (tape
->buf
!= NULL
) {
1566 idetape_pad_zeros(drive
, tape
->blk_size
*
1567 (tape
->user_bs_factor
- 1));
1571 idetape_write_filemark(drive
);
1572 idetape_flush_tape_buffers(drive
);
1573 idetape_flush_tape_buffers(drive
);
1576 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
1578 struct ide_tape_obj
*tape
= filp
->private_data
;
1579 ide_drive_t
*drive
= tape
->drive
;
1580 unsigned int minor
= iminor(inode
);
1583 tape
= drive
->driver_data
;
1585 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1587 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1588 idetape_write_release(drive
, minor
);
1589 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1591 ide_tape_discard_merge_buffer(drive
, 1);
1594 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
1595 (void) idetape_rewind_tape(drive
);
1596 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1597 if (tape
->door_locked
== DOOR_LOCKED
) {
1598 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
1599 tape
->door_locked
= DOOR_UNLOCKED
;
1602 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1608 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
1610 idetape_tape_t
*tape
= drive
->driver_data
;
1611 struct ide_atapi_pc pc
;
1613 char fw_rev
[4], vendor_id
[8], product_id
[16];
1615 idetape_create_inquiry_cmd(&pc
);
1616 pc
.buf
= &pc_buf
[0];
1617 pc
.buf_size
= sizeof(pc_buf
);
1619 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1620 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
1624 memcpy(vendor_id
, &pc
.buf
[8], 8);
1625 memcpy(product_id
, &pc
.buf
[16], 16);
1626 memcpy(fw_rev
, &pc
.buf
[32], 4);
1628 ide_fixstring(vendor_id
, 8, 0);
1629 ide_fixstring(product_id
, 16, 0);
1630 ide_fixstring(fw_rev
, 4, 0);
1632 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
1633 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
1637 * Ask the tape about its various parameters. In particular, we will adjust our
1638 * data transfer buffer size to the recommended value as returned by the tape.
1640 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
1642 idetape_tape_t
*tape
= drive
->driver_data
;
1643 struct ide_atapi_pc pc
;
1645 u8 speed
, max_speed
;
1647 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
1648 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1649 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
1650 " some default values\n");
1651 tape
->blk_size
= 512;
1652 put_unaligned(52, (u16
*)&tape
->caps
[12]);
1653 put_unaligned(540, (u16
*)&tape
->caps
[14]);
1654 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
1657 caps
= pc
.buf
+ 4 + pc
.buf
[3];
1659 /* convert to host order and save for later use */
1660 speed
= be16_to_cpup((__be16
*)&caps
[14]);
1661 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
1663 *(u16
*)&caps
[8] = max_speed
;
1664 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
1665 *(u16
*)&caps
[14] = speed
;
1666 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
1669 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
1670 "(assuming 650KB/sec)\n", drive
->name
);
1671 *(u16
*)&caps
[14] = 650;
1674 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
1675 "(assuming 650KB/sec)\n", drive
->name
);
1676 *(u16
*)&caps
[8] = 650;
1679 memcpy(&tape
->caps
, caps
, 20);
1681 /* device lacks locking support according to capabilities page */
1682 if ((caps
[6] & 1) == 0)
1683 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
1686 tape
->blk_size
= 512;
1687 else if (caps
[7] & 0x04)
1688 tape
->blk_size
= 1024;
1691 #ifdef CONFIG_IDE_PROC_FS
1692 #define ide_tape_devset_get(name, field) \
1693 static int get_##name(ide_drive_t *drive) \
1695 idetape_tape_t *tape = drive->driver_data; \
1696 return tape->field; \
1699 #define ide_tape_devset_set(name, field) \
1700 static int set_##name(ide_drive_t *drive, int arg) \
1702 idetape_tape_t *tape = drive->driver_data; \
1703 tape->field = arg; \
1707 #define ide_tape_devset_rw_field(_name, _field) \
1708 ide_tape_devset_get(_name, _field) \
1709 ide_tape_devset_set(_name, _field) \
1710 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
1712 #define ide_tape_devset_r_field(_name, _field) \
1713 ide_tape_devset_get(_name, _field) \
1714 IDE_DEVSET(_name, 0, get_##_name, NULL)
1716 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
1717 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
1718 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
1719 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
1721 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
1723 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
1724 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
1726 ide_tape_devset_r_field(avg_speed
, avg_speed
);
1727 ide_tape_devset_r_field(speed
, caps
[14]);
1728 ide_tape_devset_r_field(buffer
, caps
[16]);
1729 ide_tape_devset_r_field(buffer_size
, buffer_size
);
1731 static const struct ide_proc_devset idetape_settings
[] = {
1732 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
1733 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
1734 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
1735 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
1736 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
1737 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
1738 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
1739 mulf_tdsc
, divf_tdsc
),
1745 * The function below is called to:
1747 * 1. Initialize our various state variables.
1748 * 2. Ask the tape for its capabilities.
1749 * 3. Allocate a buffer which will be used for data transfer. The buffer size
1750 * is chosen based on the recommendation which we received in step 2.
1752 * Note that at this point ide.c already assigned us an irq, so that we can
1753 * queue requests here and wait for their completion.
1755 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
1760 u16
*ctl
= (u16
*)&tape
->caps
[12];
1762 drive
->pc_callback
= ide_tape_callback
;
1764 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
1766 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
1767 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
1769 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
1772 /* Seagate Travan drives do not support DSC overlap. */
1773 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
1774 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
1776 tape
->minor
= minor
;
1777 tape
->name
[0] = 'h';
1778 tape
->name
[1] = 't';
1779 tape
->name
[2] = '0' + minor
;
1780 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1782 idetape_get_inquiry_results(drive
);
1783 idetape_get_mode_sense_results(drive
);
1784 ide_tape_get_bsize_from_bdesc(drive
);
1785 tape
->user_bs_factor
= 1;
1786 tape
->buffer_size
= *ctl
* tape
->blk_size
;
1787 while (tape
->buffer_size
> 0xffff) {
1788 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
1790 tape
->buffer_size
= *ctl
* tape
->blk_size
;
1792 buffer_size
= tape
->buffer_size
;
1794 /* select the "best" DSC read/write polling freq */
1795 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
1797 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
1800 * Ensure that the number we got makes sense; limit it within
1801 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
1803 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
1804 IDETAPE_DSC_RW_MAX
);
1805 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
1807 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
1808 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
1809 tape
->buffer_size
/ 1024,
1810 tape
->best_dsc_rw_freq
* 1000 / HZ
,
1811 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
1813 ide_proc_register_driver(drive
, tape
->driver
);
1816 static void ide_tape_remove(ide_drive_t
*drive
)
1818 idetape_tape_t
*tape
= drive
->driver_data
;
1820 ide_proc_unregister_driver(drive
, tape
->driver
);
1821 device_del(&tape
->dev
);
1822 ide_unregister_region(tape
->disk
);
1824 mutex_lock(&idetape_ref_mutex
);
1825 put_device(&tape
->dev
);
1826 mutex_unlock(&idetape_ref_mutex
);
1829 static void ide_tape_release(struct device
*dev
)
1831 struct ide_tape_obj
*tape
= to_ide_drv(dev
, ide_tape_obj
);
1832 ide_drive_t
*drive
= tape
->drive
;
1833 struct gendisk
*g
= tape
->disk
;
1835 BUG_ON(tape
->valid
);
1837 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
1838 drive
->driver_data
= NULL
;
1839 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
1840 device_destroy(idetape_sysfs_class
,
1841 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
1842 idetape_devs
[tape
->minor
] = NULL
;
1843 g
->private_data
= NULL
;
1848 #ifdef CONFIG_IDE_PROC_FS
1849 static int proc_idetape_read_name
1850 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
1852 ide_drive_t
*drive
= (ide_drive_t
*) data
;
1853 idetape_tape_t
*tape
= drive
->driver_data
;
1857 len
= sprintf(out
, "%s\n", tape
->name
);
1858 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
1861 static ide_proc_entry_t idetape_proc
[] = {
1862 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
1863 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
1864 { NULL
, 0, NULL
, NULL
}
1867 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
1869 return idetape_proc
;
1872 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
1874 return idetape_settings
;
1878 static int ide_tape_probe(ide_drive_t
*);
1880 static struct ide_driver idetape_driver
= {
1882 .owner
= THIS_MODULE
,
1884 .bus
= &ide_bus_type
,
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
,
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 .ioctl
= idetape_chrdev_ioctl
,
1902 .open
= idetape_chrdev_open
,
1903 .release
= idetape_chrdev_release
,
1906 static int idetape_open(struct block_device
*bdev
, fmode_t mode
)
1908 struct ide_tape_obj
*tape
= ide_tape_get(bdev
->bd_disk
);
1916 static int idetape_release(struct gendisk
*disk
, fmode_t mode
)
1918 struct ide_tape_obj
*tape
= ide_drv_g(disk
, ide_tape_obj
);
1924 static int idetape_ioctl(struct block_device
*bdev
, fmode_t mode
,
1925 unsigned int cmd
, unsigned long arg
)
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
);
1931 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
1935 static struct block_device_operations idetape_block_ops
= {
1936 .owner
= THIS_MODULE
,
1937 .open
= idetape_open
,
1938 .release
= idetape_release
,
1939 .locked_ioctl
= idetape_ioctl
,
1942 static int ide_tape_probe(ide_drive_t
*drive
)
1944 idetape_tape_t
*tape
;
1948 if (!strstr("ide-tape", drive
->driver_req
))
1951 if (drive
->media
!= ide_tape
)
1954 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) &&
1955 ide_check_atapi_device(drive
, DRV_NAME
) == 0) {
1956 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
1957 " the driver\n", drive
->name
);
1960 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
1962 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
1967 g
= alloc_disk(1 << PARTN_BITS
);
1971 ide_init_disk(g
, drive
);
1973 tape
->dev
.parent
= &drive
->gendev
;
1974 tape
->dev
.release
= ide_tape_release
;
1975 dev_set_name(&tape
->dev
, dev_name(&drive
->gendev
));
1977 if (device_register(&tape
->dev
))
1980 tape
->drive
= drive
;
1981 tape
->driver
= &idetape_driver
;
1984 g
->private_data
= &tape
->driver
;
1986 drive
->driver_data
= tape
;
1988 mutex_lock(&idetape_ref_mutex
);
1989 for (minor
= 0; idetape_devs
[minor
]; minor
++)
1991 idetape_devs
[minor
] = tape
;
1992 mutex_unlock(&idetape_ref_mutex
);
1994 idetape_setup(drive
, tape
, minor
);
1996 device_create(idetape_sysfs_class
, &drive
->gendev
,
1997 MKDEV(IDETAPE_MAJOR
, minor
), NULL
, "%s", tape
->name
);
1998 device_create(idetape_sysfs_class
, &drive
->gendev
,
1999 MKDEV(IDETAPE_MAJOR
, minor
+ 128), NULL
,
2002 g
->fops
= &idetape_block_ops
;
2003 ide_register_region(g
);
2015 static void __exit
idetape_exit(void)
2017 driver_unregister(&idetape_driver
.gen_driver
);
2018 class_destroy(idetape_sysfs_class
);
2019 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2022 static int __init
idetape_init(void)
2025 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2026 if (IS_ERR(idetape_sysfs_class
)) {
2027 idetape_sysfs_class
= NULL
;
2028 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2033 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2034 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2037 goto out_free_class
;
2040 error
= driver_register(&idetape_driver
.gen_driver
);
2042 goto out_free_driver
;
2047 driver_unregister(&idetape_driver
.gen_driver
);
2049 class_destroy(idetape_sysfs_class
);
2054 MODULE_ALIAS("ide:*m-tape*");
2055 module_init(idetape_init
);
2056 module_exit(idetape_exit
);
2057 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
2058 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2059 MODULE_LICENSE("GPL");