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),
137 struct idetape_bh
*b_reqnext
;
141 /* Tape door status */
142 #define DOOR_UNLOCKED 0
143 #define DOOR_LOCKED 1
144 #define DOOR_EXPLICITLY_LOCKED 2
146 /* Some defines for the SPACE command */
147 #define IDETAPE_SPACE_OVER_FILEMARK 1
148 #define IDETAPE_SPACE_TO_EOD 3
150 /* Some defines for the LOAD UNLOAD command */
151 #define IDETAPE_LU_LOAD_MASK 1
152 #define IDETAPE_LU_RETENSION_MASK 2
153 #define IDETAPE_LU_EOT_MASK 4
155 /* Error codes returned in rq->errors to the higher part of the driver. */
156 #define IDETAPE_ERROR_GENERAL 101
157 #define IDETAPE_ERROR_FILEMARK 102
158 #define IDETAPE_ERROR_EOD 103
160 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
161 #define IDETAPE_BLOCK_DESCRIPTOR 0
162 #define IDETAPE_CAPABILITIES_PAGE 0x2a
165 * Most of our global data which we need to save even as we leave the driver due
166 * to an interrupt or a timer event is stored in the struct defined below.
168 typedef struct ide_tape_obj
{
170 ide_driver_t
*driver
;
171 struct gendisk
*disk
;
175 * failed_pc points to the last failed packet command, or contains
176 * NULL if we do not need to retry any packet command. This is
177 * required since an additional packet command is needed before the
178 * retry, to get detailed information on what went wrong.
180 /* Last failed packet command */
181 struct ide_atapi_pc
*failed_pc
;
182 /* used by REQ_IDETAPE_{READ,WRITE} requests */
183 struct ide_atapi_pc queued_pc
;
186 * DSC polling variables.
188 * While polling for DSC we use postponed_rq to postpone the current
189 * request so that ide.c will be able to service pending requests on the
190 * other device. Note that at most we will have only one DSC (usually
191 * data transfer) request in the device request queue.
193 struct request
*postponed_rq
;
194 /* The time in which we started polling for DSC */
195 unsigned long dsc_polling_start
;
196 /* Timer used to poll for dsc */
197 struct timer_list dsc_timer
;
198 /* Read/Write dsc polling frequency */
199 unsigned long best_dsc_rw_freq
;
200 unsigned long dsc_poll_freq
;
201 unsigned long dsc_timeout
;
203 /* Read position information */
206 unsigned int first_frame
;
208 /* Last error information */
209 u8 sense_key
, asc
, ascq
;
211 /* Character device operation */
215 /* Current character device data transfer direction */
218 /* tape block size, usually 512 or 1024 bytes */
219 unsigned short blk_size
;
222 /* Copy of the tape's Capabilities and Mechanical Page */
226 * Active data transfer request parameters.
228 * At most, there is only one ide-tape originated data transfer request
229 * in the device request queue. This allows ide.c to easily service
230 * requests from the other device when we postpone our active request.
233 /* Data buffer size chosen based on the tape's recommendation */
236 struct idetape_bh
*merge_bh
;
237 /* size of the merge buffer */
239 /* pointer to current buffer head within the merge buffer */
240 struct idetape_bh
*bh
;
244 int pages_per_buffer
;
245 /* Wasted space in each stage */
248 /* protects the ide-tape queue */
251 /* Measures average tape speed */
252 unsigned long avg_time
;
256 /* the door is currently locked */
258 /* the tape hardware is write protected */
260 /* the tape is write protected (hardware or opened as read-only) */
266 static DEFINE_MUTEX(idetape_ref_mutex
);
268 static struct class *idetape_sysfs_class
;
270 static void ide_tape_release(struct kref
*);
272 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
274 struct ide_tape_obj
*tape
= NULL
;
276 mutex_lock(&idetape_ref_mutex
);
277 tape
= ide_drv_g(disk
, ide_tape_obj
);
279 if (ide_device_get(tape
->drive
))
282 kref_get(&tape
->kref
);
284 mutex_unlock(&idetape_ref_mutex
);
288 static void ide_tape_put(struct ide_tape_obj
*tape
)
290 ide_drive_t
*drive
= tape
->drive
;
292 mutex_lock(&idetape_ref_mutex
);
293 kref_put(&tape
->kref
, ide_tape_release
);
294 ide_device_put(drive
);
295 mutex_unlock(&idetape_ref_mutex
);
299 * The variables below are used for the character device interface. Additional
300 * state variables are defined in our ide_drive_t structure.
302 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
304 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
306 struct ide_tape_obj
*tape
= NULL
;
308 mutex_lock(&idetape_ref_mutex
);
309 tape
= idetape_devs
[i
];
311 kref_get(&tape
->kref
);
312 mutex_unlock(&idetape_ref_mutex
);
316 static void idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
319 struct idetape_bh
*bh
= pc
->bh
;
324 printk(KERN_ERR
"ide-tape: bh == NULL in "
325 "idetape_input_buffers\n");
326 ide_pad_transfer(drive
, 0, bcount
);
330 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
332 drive
->hwif
->tp_ops
->input_data(drive
, NULL
, bh
->b_data
+
333 atomic_read(&bh
->b_count
), count
);
335 atomic_add(count
, &bh
->b_count
);
336 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
339 atomic_set(&bh
->b_count
, 0);
345 static void idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
348 struct idetape_bh
*bh
= pc
->bh
;
353 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
357 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
358 drive
->hwif
->tp_ops
->output_data(drive
, NULL
, pc
->b_data
, count
);
361 pc
->b_count
-= count
;
366 pc
->b_data
= bh
->b_data
;
367 pc
->b_count
= atomic_read(&bh
->b_count
);
373 static void idetape_update_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
375 struct idetape_bh
*bh
= pc
->bh
;
377 unsigned int bcount
= pc
->xferred
;
379 if (pc
->flags
& PC_FLAG_WRITING
)
383 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
387 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
388 atomic_set(&bh
->b_count
, count
);
389 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
397 * called on each failed packet command retry to analyze the request sense. We
398 * currently do not utilize this information.
400 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
402 idetape_tape_t
*tape
= drive
->driver_data
;
403 struct ide_atapi_pc
*pc
= tape
->failed_pc
;
405 tape
->sense_key
= sense
[2] & 0xF;
406 tape
->asc
= sense
[12];
407 tape
->ascq
= sense
[13];
409 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
410 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
412 /* Correct pc->xferred by asking the tape. */
413 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
414 pc
->xferred
= pc
->req_xfer
-
416 get_unaligned_be32(&sense
[3]);
417 idetape_update_buffers(drive
, pc
);
421 * If error was the result of a zero-length read or write command,
422 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
423 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
425 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
427 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
428 if (tape
->sense_key
== 5) {
429 /* don't report an error, everything's ok */
431 /* don't retry read/write */
432 pc
->flags
|= PC_FLAG_ABORT
;
435 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
436 pc
->error
= IDETAPE_ERROR_FILEMARK
;
437 pc
->flags
|= PC_FLAG_ABORT
;
439 if (pc
->c
[0] == WRITE_6
) {
440 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
441 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
442 pc
->error
= IDETAPE_ERROR_EOD
;
443 pc
->flags
|= PC_FLAG_ABORT
;
446 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
447 if (tape
->sense_key
== 8) {
448 pc
->error
= IDETAPE_ERROR_EOD
;
449 pc
->flags
|= PC_FLAG_ABORT
;
451 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
453 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
457 /* Free data buffers completely. */
458 static void ide_tape_kfree_buffer(idetape_tape_t
*tape
)
460 struct idetape_bh
*prev_bh
, *bh
= tape
->merge_bh
;
463 u32 size
= bh
->b_size
;
466 unsigned int order
= fls(size
>> PAGE_SHIFT
)-1;
469 free_pages((unsigned long)bh
->b_data
, order
);
472 bh
->b_data
+= (1 << order
) * PAGE_SIZE
;
480 static int idetape_end_request(ide_drive_t
*drive
, int uptodate
, int nr_sects
)
482 struct request
*rq
= HWGROUP(drive
)->rq
;
483 idetape_tape_t
*tape
= drive
->driver_data
;
487 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
490 case 0: error
= IDETAPE_ERROR_GENERAL
; break;
491 case 1: error
= 0; break;
492 default: error
= uptodate
;
496 tape
->failed_pc
= NULL
;
498 if (!blk_special_request(rq
)) {
499 ide_end_request(drive
, uptodate
, nr_sects
);
503 spin_lock_irqsave(&tape
->lock
, flags
);
505 ide_end_drive_cmd(drive
, 0, 0);
507 spin_unlock_irqrestore(&tape
->lock
, flags
);
511 static void ide_tape_handle_dsc(ide_drive_t
*);
513 static void ide_tape_callback(ide_drive_t
*drive
, int dsc
)
515 idetape_tape_t
*tape
= drive
->driver_data
;
516 struct ide_atapi_pc
*pc
= drive
->pc
;
517 int uptodate
= pc
->error
? 0 : 1;
519 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
522 ide_tape_handle_dsc(drive
);
524 if (tape
->failed_pc
== pc
)
525 tape
->failed_pc
= NULL
;
527 if (pc
->c
[0] == REQUEST_SENSE
) {
529 idetape_analyze_error(drive
, pc
->buf
);
531 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE "
532 "itself - Aborting request!\n");
533 } else if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
534 struct request
*rq
= drive
->hwif
->hwgroup
->rq
;
535 int blocks
= pc
->xferred
/ tape
->blk_size
;
537 tape
->avg_size
+= blocks
* tape
->blk_size
;
539 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
540 tape
->avg_speed
= tape
->avg_size
* HZ
/
541 (jiffies
- tape
->avg_time
) / 1024;
543 tape
->avg_time
= jiffies
;
546 tape
->first_frame
+= blocks
;
547 rq
->current_nr_sectors
-= blocks
;
550 uptodate
= pc
->error
;
551 } else if (pc
->c
[0] == READ_POSITION
&& uptodate
) {
552 u8
*readpos
= pc
->buf
;
554 debug_log(DBG_SENSE
, "BOP - %s\n",
555 (readpos
[0] & 0x80) ? "Yes" : "No");
556 debug_log(DBG_SENSE
, "EOP - %s\n",
557 (readpos
[0] & 0x40) ? "Yes" : "No");
559 if (readpos
[0] & 0x4) {
560 printk(KERN_INFO
"ide-tape: Block location is unknown"
562 clear_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
565 debug_log(DBG_SENSE
, "Block Location - %u\n",
566 be32_to_cpup((__be32
*)&readpos
[4]));
568 tape
->partition
= readpos
[1];
569 tape
->first_frame
= be32_to_cpup((__be32
*)&readpos
[4]);
570 set_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
574 idetape_end_request(drive
, uptodate
, 0);
578 * Postpone the current request so that ide.c will be able to service requests
579 * from another device on the same hwgroup while we are polling for DSC.
581 static void idetape_postpone_request(ide_drive_t
*drive
)
583 idetape_tape_t
*tape
= drive
->driver_data
;
585 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
587 tape
->postponed_rq
= HWGROUP(drive
)->rq
;
588 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
591 static void ide_tape_handle_dsc(ide_drive_t
*drive
)
593 idetape_tape_t
*tape
= drive
->driver_data
;
595 /* Media access command */
596 tape
->dsc_polling_start
= jiffies
;
597 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
598 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
599 /* Allow ide.c to handle other requests */
600 idetape_postpone_request(drive
);
603 static int ide_tape_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
604 unsigned int bcount
, int write
)
607 idetape_output_buffers(drive
, pc
, bcount
);
609 idetape_input_buffers(drive
, pc
, bcount
);
615 * Packet Command Interface
617 * The current Packet Command is available in drive->pc, and will not change
618 * until we finish handling it. Each packet command is associated with a
619 * callback function that will be called when the command is finished.
621 * The handling will be done in three stages:
623 * 1. idetape_issue_pc will send the packet command to the drive, and will set
624 * the interrupt handler to ide_pc_intr.
626 * 2. On each interrupt, ide_pc_intr will be called. This step will be
627 * repeated until the device signals us that no more interrupts will be issued.
629 * 3. ATAPI Tape media access commands have immediate status with a delayed
630 * process. In case of a successful initiation of a media access packet command,
631 * the DSC bit will be set when the actual execution of the command is finished.
632 * Since the tape drive will not issue an interrupt, we have to poll for this
633 * event. In this case, we define the request as "low priority request" by
634 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
637 * ide.c will then give higher priority to requests which originate from the
638 * other device, until will change rq_status to RQ_ACTIVE.
640 * 4. When the packet command is finished, it will be checked for errors.
642 * 5. In case an error was found, we queue a request sense packet command in
643 * front of the request queue and retry the operation up to
644 * IDETAPE_MAX_PC_RETRIES times.
646 * 6. In case no error was found, or we decided to give up and not to retry
647 * again, the callback function will be called and then we will handle the next
651 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
652 struct ide_atapi_pc
*pc
)
654 idetape_tape_t
*tape
= drive
->driver_data
;
656 if (drive
->pc
->c
[0] == REQUEST_SENSE
&&
657 pc
->c
[0] == REQUEST_SENSE
) {
658 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
659 "Two request sense in serial were issued\n");
662 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
663 tape
->failed_pc
= pc
;
665 /* Set the current packet command */
668 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
669 (pc
->flags
& PC_FLAG_ABORT
)) {
671 * We will "abort" retrying a packet command in case legitimate
672 * error code was received (crossing a filemark, or end of the
673 * media, for example).
675 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
676 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
677 tape
->sense_key
== 2 && tape
->asc
== 4 &&
678 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
679 printk(KERN_ERR
"ide-tape: %s: I/O error, "
680 "pc = %2x, key = %2x, "
681 "asc = %2x, ascq = %2x\n",
682 tape
->name
, pc
->c
[0],
683 tape
->sense_key
, tape
->asc
,
687 pc
->error
= IDETAPE_ERROR_GENERAL
;
689 tape
->failed_pc
= NULL
;
690 drive
->pc_callback(drive
, 0);
693 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
697 return ide_issue_pc(drive
);
700 /* A mode sense command is used to "sense" tape parameters. */
701 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
704 pc
->c
[0] = MODE_SENSE
;
705 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
706 /* DBD = 1 - Don't return block descriptors */
708 pc
->c
[2] = page_code
;
710 * Changed pc->c[3] to 0 (255 will at best return unused info).
712 * For SCSI this byte is defined as subpage instead of high byte
713 * of length and some IDE drives seem to interpret it this way
714 * and return an error when 255 is used.
717 /* We will just discard data in that case */
719 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
721 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
727 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
729 ide_hwif_t
*hwif
= drive
->hwif
;
730 idetape_tape_t
*tape
= drive
->driver_data
;
731 struct ide_atapi_pc
*pc
= drive
->pc
;
734 stat
= hwif
->tp_ops
->read_status(hwif
);
736 if (stat
& ATA_DSC
) {
737 if (stat
& ATA_ERR
) {
739 if (pc
->c
[0] != TEST_UNIT_READY
)
740 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
742 /* Retry operation */
743 ide_retry_pc(drive
, tape
->disk
);
748 pc
->error
= IDETAPE_ERROR_GENERAL
;
749 tape
->failed_pc
= NULL
;
751 drive
->pc_callback(drive
, 0);
755 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
756 struct ide_atapi_pc
*pc
, struct request
*rq
,
759 struct idetape_bh
*bh
= (struct idetape_bh
*)rq
->special
;
760 unsigned int length
= rq
->current_nr_sectors
;
763 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
767 pc
->buf_size
= length
* tape
->blk_size
;
768 pc
->req_xfer
= pc
->buf_size
;
769 if (pc
->req_xfer
== tape
->buffer_size
)
770 pc
->flags
|= PC_FLAG_DMA_OK
;
772 if (opcode
== READ_6
) {
774 atomic_set(&bh
->b_count
, 0);
775 } else if (opcode
== WRITE_6
) {
777 pc
->flags
|= PC_FLAG_WRITING
;
778 pc
->b_data
= bh
->b_data
;
779 pc
->b_count
= atomic_read(&bh
->b_count
);
782 memcpy(rq
->cmd
, pc
->c
, 12);
785 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
786 struct request
*rq
, sector_t block
)
788 ide_hwif_t
*hwif
= drive
->hwif
;
789 idetape_tape_t
*tape
= drive
->driver_data
;
790 struct ide_atapi_pc
*pc
= NULL
;
791 struct request
*postponed_rq
= tape
->postponed_rq
;
794 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %lu,"
795 " current_nr_sectors: %u\n",
796 (unsigned long long)rq
->sector
, rq
->nr_sectors
,
797 rq
->current_nr_sectors
);
799 if (!blk_special_request(rq
)) {
800 /* We do not support buffer cache originated requests. */
801 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
802 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
803 ide_end_request(drive
, 0, 0);
807 /* Retry a failed packet command */
808 if (tape
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
809 pc
= tape
->failed_pc
;
813 if (postponed_rq
!= NULL
)
814 if (rq
!= postponed_rq
) {
815 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
816 "Two DSC requests were queued\n");
817 idetape_end_request(drive
, 0, 0);
821 tape
->postponed_rq
= NULL
;
824 * If the tape is still busy, postpone our request and service
825 * the other device meanwhile.
827 stat
= hwif
->tp_ops
->read_status(hwif
);
829 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
830 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
831 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
833 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
834 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
835 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
838 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
839 (stat
& ATA_DSC
) == 0) {
840 if (postponed_rq
== NULL
) {
841 tape
->dsc_polling_start
= jiffies
;
842 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
843 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
844 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
845 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
847 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
848 idetape_media_access_finished(drive
);
851 return ide_do_reset(drive
);
853 } else if (time_after(jiffies
,
854 tape
->dsc_polling_start
+
855 IDETAPE_DSC_MA_THRESHOLD
))
856 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
857 idetape_postpone_request(drive
);
860 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
861 pc
= &tape
->queued_pc
;
862 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
865 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
866 pc
= &tape
->queued_pc
;
867 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
870 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
871 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
872 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
873 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
876 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
877 idetape_media_access_finished(drive
);
883 return idetape_issue_pc(drive
, pc
);
887 * The function below uses __get_free_pages to allocate a data buffer of size
888 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
891 * It returns a pointer to the newly allocated buffer, or NULL in case of
894 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
897 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
898 int pages
= tape
->pages_per_buffer
;
899 unsigned int order
, b_allocd
;
902 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
907 order
= fls(pages
) - 1;
908 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
911 b_allocd
= (1 << order
) * PAGE_SIZE
;
915 memset(bh
->b_data
, 0, b_allocd
);
916 bh
->b_reqnext
= NULL
;
917 bh
->b_size
= b_allocd
;
918 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
921 order
= fls(pages
) - 1;
922 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
925 b_allocd
= (1 << order
) * PAGE_SIZE
;
928 memset(b_data
, 0, b_allocd
);
930 /* newly allocated page frames below buffer header or ...*/
931 if (bh
->b_data
== b_data
+ b_allocd
) {
932 bh
->b_size
+= b_allocd
;
933 bh
->b_data
-= b_allocd
;
935 atomic_add(b_allocd
, &bh
->b_count
);
938 /* they are above the header */
939 if (b_data
== bh
->b_data
+ bh
->b_size
) {
940 bh
->b_size
+= b_allocd
;
942 atomic_add(b_allocd
, &bh
->b_count
);
946 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
948 free_pages((unsigned long) b_data
, order
);
951 bh
->b_reqnext
= NULL
;
953 bh
->b_size
= b_allocd
;
954 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
955 prev_bh
->b_reqnext
= bh
;
960 bh
->b_size
-= tape
->excess_bh_size
;
962 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
965 ide_tape_kfree_buffer(tape
);
969 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
970 const char __user
*buf
, int n
)
972 struct idetape_bh
*bh
= tape
->bh
;
978 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
982 count
= min((unsigned int)
983 (bh
->b_size
- atomic_read(&bh
->b_count
)),
985 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
989 atomic_add(count
, &bh
->b_count
);
991 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
994 atomic_set(&bh
->b_count
, 0);
1001 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1004 struct idetape_bh
*bh
= tape
->bh
;
1010 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1014 count
= min(tape
->b_count
, n
);
1015 if (copy_to_user(buf
, tape
->b_data
, count
))
1018 tape
->b_data
+= count
;
1019 tape
->b_count
-= count
;
1021 if (!tape
->b_count
) {
1025 tape
->b_data
= bh
->b_data
;
1026 tape
->b_count
= atomic_read(&bh
->b_count
);
1033 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
1035 struct idetape_bh
*bh
= tape
->merge_bh
;
1036 tape
->bh
= tape
->merge_bh
;
1038 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1039 atomic_set(&bh
->b_count
, 0);
1041 tape
->b_data
= bh
->b_data
;
1042 tape
->b_count
= atomic_read(&bh
->b_count
);
1047 * Write a filemark if write_filemark=1. Flush the device buffers without
1048 * writing a filemark otherwise.
1050 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1051 struct ide_atapi_pc
*pc
, int write_filemark
)
1054 pc
->c
[0] = WRITE_FILEMARKS
;
1055 pc
->c
[4] = write_filemark
;
1056 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1059 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1061 idetape_tape_t
*tape
= drive
->driver_data
;
1062 struct gendisk
*disk
= tape
->disk
;
1063 int load_attempted
= 0;
1065 /* Wait for the tape to become ready */
1066 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1068 while (time_before(jiffies
, timeout
)) {
1069 if (ide_do_test_unit_ready(drive
, disk
) == 0)
1071 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1072 || (tape
->asc
== 0x3A)) {
1076 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1078 /* not about to be ready */
1079 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1080 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1087 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1089 struct ide_tape_obj
*tape
= drive
->driver_data
;
1090 struct ide_atapi_pc pc
;
1093 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1094 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
1097 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1101 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1104 pc
->c
[0] = READ_POSITION
;
1108 static int idetape_read_position(ide_drive_t
*drive
)
1110 idetape_tape_t
*tape
= drive
->driver_data
;
1111 struct ide_atapi_pc pc
;
1114 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1116 idetape_create_read_position_cmd(&pc
);
1117 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
1119 position
= tape
->first_frame
;
1123 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1124 struct ide_atapi_pc
*pc
,
1125 unsigned int block
, u8 partition
, int skip
)
1128 pc
->c
[0] = POSITION_TO_ELEMENT
;
1130 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1131 pc
->c
[8] = partition
;
1132 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1135 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1137 idetape_tape_t
*tape
= drive
->driver_data
;
1139 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1142 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
1143 tape
->merge_bh_size
= 0;
1144 if (tape
->merge_bh
!= NULL
) {
1145 ide_tape_kfree_buffer(tape
);
1146 tape
->merge_bh
= NULL
;
1149 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1153 * Position the tape to the requested block using the LOCATE packet command.
1154 * A READ POSITION command is then issued to check where we are positioned. Like
1155 * all higher level operations, we queue the commands at the tail of the request
1156 * queue and wait for their completion.
1158 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1159 u8 partition
, int skip
)
1161 idetape_tape_t
*tape
= drive
->driver_data
;
1162 struct gendisk
*disk
= tape
->disk
;
1164 struct ide_atapi_pc pc
;
1166 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1167 __ide_tape_discard_merge_buffer(drive
);
1168 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1169 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1170 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1174 idetape_create_read_position_cmd(&pc
);
1175 return ide_queue_pc_tail(drive
, disk
, &pc
);
1178 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1179 int restore_position
)
1181 idetape_tape_t
*tape
= drive
->driver_data
;
1184 __ide_tape_discard_merge_buffer(drive
);
1185 if (restore_position
) {
1186 position
= idetape_read_position(drive
);
1187 seek
= position
> 0 ? position
: 0;
1188 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1189 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1190 " %s\n", tape
->name
, __func__
);
1197 * Generate a read/write request for the block device interface and wait for it
1200 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1201 struct idetape_bh
*bh
)
1203 idetape_tape_t
*tape
= drive
->driver_data
;
1207 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1209 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1210 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1212 rq
->rq_disk
= tape
->disk
;
1213 rq
->special
= (void *)bh
;
1214 rq
->sector
= tape
->first_frame
;
1215 rq
->nr_sectors
= blocks
;
1216 rq
->current_nr_sectors
= blocks
;
1217 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1219 errors
= rq
->errors
;
1220 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1221 blk_put_request(rq
);
1223 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1227 idetape_init_merge_buffer(tape
);
1228 if (errors
== IDETAPE_ERROR_GENERAL
)
1233 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1241 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1242 struct ide_atapi_pc
*pc
)
1245 pc
->c
[0] = REZERO_UNIT
;
1246 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1249 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1254 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1257 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1261 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1263 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1266 /* Queue up a character device originated write request. */
1267 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1269 idetape_tape_t
*tape
= drive
->driver_data
;
1271 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1273 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1274 blocks
, tape
->merge_bh
);
1277 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1279 idetape_tape_t
*tape
= drive
->driver_data
;
1281 struct idetape_bh
*bh
;
1283 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1284 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1285 " but we are not writing.\n");
1288 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1289 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1290 tape
->merge_bh_size
= tape
->buffer_size
;
1292 if (tape
->merge_bh_size
) {
1293 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1294 if (tape
->merge_bh_size
% tape
->blk_size
) {
1298 i
= tape
->blk_size
- tape
->merge_bh_size
%
1300 bh
= tape
->bh
->b_reqnext
;
1302 atomic_set(&bh
->b_count
, 0);
1308 printk(KERN_INFO
"ide-tape: bug,"
1312 min
= min(i
, (unsigned int)(bh
->b_size
-
1313 atomic_read(&bh
->b_count
)));
1314 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1316 atomic_add(min
, &bh
->b_count
);
1321 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1322 tape
->merge_bh_size
= 0;
1324 if (tape
->merge_bh
!= NULL
) {
1325 ide_tape_kfree_buffer(tape
);
1326 tape
->merge_bh
= NULL
;
1328 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1331 static int idetape_init_read(ide_drive_t
*drive
)
1333 idetape_tape_t
*tape
= drive
->driver_data
;
1336 /* Initialize read operation */
1337 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1338 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1339 ide_tape_flush_merge_buffer(drive
);
1340 idetape_flush_tape_buffers(drive
);
1342 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1343 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1345 tape
->merge_bh_size
= 0;
1347 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1348 if (!tape
->merge_bh
)
1350 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1353 * Issue a read 0 command to ensure that DSC handshake is
1354 * switched from completion mode to buffer available mode.
1355 * No point in issuing this if DSC overlap isn't supported, some
1356 * drives (Seagate STT3401A) will return an error.
1358 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1359 bytes_read
= idetape_queue_rw_tail(drive
,
1360 REQ_IDETAPE_READ
, 0,
1362 if (bytes_read
< 0) {
1363 ide_tape_kfree_buffer(tape
);
1364 tape
->merge_bh
= NULL
;
1365 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1374 /* called from idetape_chrdev_read() to service a chrdev read request. */
1375 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1377 idetape_tape_t
*tape
= drive
->driver_data
;
1379 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1381 /* If we are at a filemark, return a read length of 0 */
1382 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1385 idetape_init_read(drive
);
1387 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1391 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1393 idetape_tape_t
*tape
= drive
->driver_data
;
1394 struct idetape_bh
*bh
;
1400 bh
= tape
->merge_bh
;
1401 count
= min(tape
->buffer_size
, bcount
);
1403 blocks
= count
/ tape
->blk_size
;
1405 atomic_set(&bh
->b_count
,
1406 min(count
, (unsigned int)bh
->b_size
));
1407 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1408 count
-= atomic_read(&bh
->b_count
);
1411 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1417 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1418 * currently support only one partition.
1420 static int idetape_rewind_tape(ide_drive_t
*drive
)
1422 struct ide_tape_obj
*tape
= drive
->driver_data
;
1423 struct gendisk
*disk
= tape
->disk
;
1425 struct ide_atapi_pc pc
;
1427 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1429 idetape_create_rewind_cmd(drive
, &pc
);
1430 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1434 idetape_create_read_position_cmd(&pc
);
1435 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1441 /* mtio.h compatible commands should be issued to the chrdev interface. */
1442 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1445 idetape_tape_t
*tape
= drive
->driver_data
;
1446 void __user
*argp
= (void __user
*)arg
;
1448 struct idetape_config
{
1449 int dsc_rw_frequency
;
1450 int dsc_media_access_frequency
;
1454 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1458 if (copy_from_user(&config
, argp
, sizeof(config
)))
1460 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1463 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1464 config
.nr_stages
= 1;
1465 if (copy_to_user(argp
, &config
, sizeof(config
)))
1474 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1477 idetape_tape_t
*tape
= drive
->driver_data
;
1478 struct gendisk
*disk
= tape
->disk
;
1479 struct ide_atapi_pc pc
;
1480 int retval
, count
= 0;
1481 int sprev
= !!(tape
->caps
[4] & 0x20);
1485 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1488 mt_count
= -mt_count
;
1491 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1492 tape
->merge_bh_size
= 0;
1493 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1495 ide_tape_discard_merge_buffer(drive
, 0);
1501 idetape_create_space_cmd(&pc
, mt_count
- count
,
1502 IDETAPE_SPACE_OVER_FILEMARK
);
1503 return ide_queue_pc_tail(drive
, disk
, &pc
);
1508 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1512 count
= (MTBSFM
== mt_op
? 1 : -1);
1513 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1515 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1522 * Our character device read / write functions.
1524 * The tape is optimized to maximize throughput when it is transferring an
1525 * integral number of the "continuous transfer limit", which is a parameter of
1526 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1528 * As of version 1.3 of the driver, the character device provides an abstract
1529 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1530 * same backup/restore procedure is supported. The driver will internally
1531 * convert the requests to the recommended transfer unit, so that an unmatch
1532 * between the user's block size to the recommended size will only result in a
1533 * (slightly) increased driver overhead, but will no longer hit performance.
1534 * This is not applicable to Onstream.
1536 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1537 size_t count
, loff_t
*ppos
)
1539 struct ide_tape_obj
*tape
= file
->private_data
;
1540 ide_drive_t
*drive
= tape
->drive
;
1541 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
1543 u16 ctl
= *(u16
*)&tape
->caps
[12];
1545 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1547 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1548 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1549 if (count
> tape
->blk_size
&&
1550 (count
% tape
->blk_size
) == 0)
1551 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1553 rc
= idetape_init_read(drive
);
1558 if (tape
->merge_bh_size
) {
1559 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
1560 (unsigned int)count
);
1561 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
1563 buf
+= actually_read
;
1564 tape
->merge_bh_size
-= actually_read
;
1565 count
-= actually_read
;
1567 while (count
>= tape
->buffer_size
) {
1568 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1569 if (bytes_read
<= 0)
1571 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
1574 count
-= bytes_read
;
1575 actually_read
+= bytes_read
;
1578 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1579 if (bytes_read
<= 0)
1581 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
1582 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
1584 actually_read
+= temp
;
1585 tape
->merge_bh_size
= bytes_read
-temp
;
1588 if (!actually_read
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1589 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1591 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1595 return ret
? ret
: actually_read
;
1598 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1599 size_t count
, loff_t
*ppos
)
1601 struct ide_tape_obj
*tape
= file
->private_data
;
1602 ide_drive_t
*drive
= tape
->drive
;
1603 ssize_t actually_written
= 0;
1605 u16 ctl
= *(u16
*)&tape
->caps
[12];
1607 /* The drive is write protected. */
1608 if (tape
->write_prot
)
1611 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1613 /* Initialize write operation */
1614 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1615 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1616 ide_tape_discard_merge_buffer(drive
, 1);
1617 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1618 printk(KERN_ERR
"ide-tape: merge_bh_size "
1619 "should be 0 now\n");
1620 tape
->merge_bh_size
= 0;
1622 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1623 if (!tape
->merge_bh
)
1625 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
1626 idetape_init_merge_buffer(tape
);
1629 * Issue a write 0 command to ensure that DSC handshake is
1630 * switched from completion mode to buffer available mode. No
1631 * point in issuing this if DSC overlap isn't supported, some
1632 * drives (Seagate STT3401A) will return an error.
1634 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1635 ssize_t retval
= idetape_queue_rw_tail(drive
,
1636 REQ_IDETAPE_WRITE
, 0,
1639 ide_tape_kfree_buffer(tape
);
1640 tape
->merge_bh
= NULL
;
1641 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1648 if (tape
->merge_bh_size
) {
1649 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
1650 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
1651 tape
->merge_bh_size
= 0;
1653 actually_written
= min((unsigned int)
1654 (tape
->buffer_size
- tape
->merge_bh_size
),
1655 (unsigned int)count
);
1656 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
1658 buf
+= actually_written
;
1659 tape
->merge_bh_size
+= actually_written
;
1660 count
-= actually_written
;
1662 if (tape
->merge_bh_size
== tape
->buffer_size
) {
1664 tape
->merge_bh_size
= 0;
1665 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1670 while (count
>= tape
->buffer_size
) {
1672 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
1674 buf
+= tape
->buffer_size
;
1675 count
-= tape
->buffer_size
;
1676 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1677 actually_written
+= tape
->buffer_size
;
1682 actually_written
+= count
;
1683 if (idetape_copy_stage_from_user(tape
, buf
, count
))
1685 tape
->merge_bh_size
+= count
;
1687 return ret
? ret
: actually_written
;
1690 static int idetape_write_filemark(ide_drive_t
*drive
)
1692 struct ide_tape_obj
*tape
= drive
->driver_data
;
1693 struct ide_atapi_pc pc
;
1695 /* Write a filemark */
1696 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1697 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1698 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1705 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1708 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1709 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1710 * usually not supported.
1712 * The following commands are currently not supported:
1714 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1715 * MT_ST_WRITE_THRESHOLD.
1717 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1719 idetape_tape_t
*tape
= drive
->driver_data
;
1720 struct gendisk
*disk
= tape
->disk
;
1721 struct ide_atapi_pc pc
;
1724 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1734 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1741 if (tape
->write_prot
)
1743 ide_tape_discard_merge_buffer(drive
, 1);
1744 for (i
= 0; i
< mt_count
; i
++) {
1745 retval
= idetape_write_filemark(drive
);
1751 ide_tape_discard_merge_buffer(drive
, 0);
1752 if (idetape_rewind_tape(drive
))
1756 ide_tape_discard_merge_buffer(drive
, 0);
1757 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1761 * If door is locked, attempt to unlock before
1762 * attempting to eject.
1764 if (tape
->door_locked
) {
1765 if (!ide_set_media_lock(drive
, disk
, 0))
1766 tape
->door_locked
= DOOR_UNLOCKED
;
1768 ide_tape_discard_merge_buffer(drive
, 0);
1769 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1771 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1774 ide_tape_discard_merge_buffer(drive
, 0);
1775 return idetape_flush_tape_buffers(drive
);
1777 ide_tape_discard_merge_buffer(drive
, 0);
1778 return ide_do_start_stop(drive
, disk
,
1779 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1781 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1782 return ide_queue_pc_tail(drive
, disk
, &pc
);
1784 (void)idetape_rewind_tape(drive
);
1785 idetape_create_erase_cmd(&pc
);
1786 return ide_queue_pc_tail(drive
, disk
, &pc
);
1789 if (mt_count
< tape
->blk_size
||
1790 mt_count
% tape
->blk_size
)
1792 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1793 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1795 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1798 ide_tape_discard_merge_buffer(drive
, 0);
1799 return idetape_position_tape(drive
,
1800 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1802 ide_tape_discard_merge_buffer(drive
, 0);
1803 return idetape_position_tape(drive
, 0, mt_count
, 0);
1807 retval
= ide_set_media_lock(drive
, disk
, 1);
1810 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1813 retval
= ide_set_media_lock(drive
, disk
, 0);
1816 tape
->door_locked
= DOOR_UNLOCKED
;
1819 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1826 * Our character device ioctls. General mtio.h magnetic io commands are
1827 * supported here, and not in the corresponding block interface. Our own
1828 * ide-tape ioctls are supported on both interfaces.
1830 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1831 unsigned int cmd
, unsigned long arg
)
1833 struct ide_tape_obj
*tape
= file
->private_data
;
1834 ide_drive_t
*drive
= tape
->drive
;
1838 int block_offset
= 0, position
= tape
->first_frame
;
1839 void __user
*argp
= (void __user
*)arg
;
1841 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1843 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1844 ide_tape_flush_merge_buffer(drive
);
1845 idetape_flush_tape_buffers(drive
);
1847 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1848 block_offset
= tape
->merge_bh_size
/
1849 (tape
->blk_size
* tape
->user_bs_factor
);
1850 position
= idetape_read_position(drive
);
1856 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1858 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1860 memset(&mtget
, 0, sizeof(struct mtget
));
1861 mtget
.mt_type
= MT_ISSCSI2
;
1862 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1864 ((tape
->blk_size
* tape
->user_bs_factor
)
1865 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1867 if (tape
->drv_write_prot
)
1868 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1870 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1874 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1875 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1879 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1880 ide_tape_discard_merge_buffer(drive
, 1);
1881 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1886 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1887 * block size with the reported value.
1889 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1891 idetape_tape_t
*tape
= drive
->driver_data
;
1892 struct ide_atapi_pc pc
;
1894 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1895 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1896 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1897 if (tape
->blk_size
== 0) {
1898 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1899 "block size, assuming 32k\n");
1900 tape
->blk_size
= 32768;
1904 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1905 (pc
.buf
[4 + 6] << 8) +
1907 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1910 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1912 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1914 idetape_tape_t
*tape
;
1917 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1921 tape
= ide_tape_chrdev_get(i
);
1927 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1930 * We really want to do nonseekable_open(inode, filp); here, but some
1931 * versions of tar incorrectly call lseek on tapes and bail out if that
1932 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1934 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1936 drive
= tape
->drive
;
1938 filp
->private_data
= tape
;
1940 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1945 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1947 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1948 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1952 idetape_read_position(drive
);
1953 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1954 (void)idetape_rewind_tape(drive
);
1956 /* Read block size and write protect status from drive. */
1957 ide_tape_get_bsize_from_bdesc(drive
);
1959 /* Set write protect flag if device is opened as read-only. */
1960 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1961 tape
->write_prot
= 1;
1963 tape
->write_prot
= tape
->drv_write_prot
;
1965 /* Make sure drive isn't write protected if user wants to write. */
1966 if (tape
->write_prot
) {
1967 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1968 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1969 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1975 /* Lock the tape drive door so user can't eject. */
1976 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1977 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1978 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1979 tape
->door_locked
= DOOR_LOCKED
;
1991 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1993 idetape_tape_t
*tape
= drive
->driver_data
;
1995 ide_tape_flush_merge_buffer(drive
);
1996 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
1997 if (tape
->merge_bh
!= NULL
) {
1998 idetape_pad_zeros(drive
, tape
->blk_size
*
1999 (tape
->user_bs_factor
- 1));
2000 ide_tape_kfree_buffer(tape
);
2001 tape
->merge_bh
= NULL
;
2003 idetape_write_filemark(drive
);
2004 idetape_flush_tape_buffers(drive
);
2005 idetape_flush_tape_buffers(drive
);
2008 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2010 struct ide_tape_obj
*tape
= filp
->private_data
;
2011 ide_drive_t
*drive
= tape
->drive
;
2012 unsigned int minor
= iminor(inode
);
2015 tape
= drive
->driver_data
;
2017 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2019 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2020 idetape_write_release(drive
, minor
);
2021 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2023 ide_tape_discard_merge_buffer(drive
, 1);
2026 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
2027 (void) idetape_rewind_tape(drive
);
2028 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2029 if (tape
->door_locked
== DOOR_LOCKED
) {
2030 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
2031 tape
->door_locked
= DOOR_UNLOCKED
;
2034 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
2040 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2042 idetape_tape_t
*tape
= drive
->driver_data
;
2043 struct ide_atapi_pc pc
;
2044 char fw_rev
[4], vendor_id
[8], product_id
[16];
2046 idetape_create_inquiry_cmd(&pc
);
2047 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2048 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2052 memcpy(vendor_id
, &pc
.buf
[8], 8);
2053 memcpy(product_id
, &pc
.buf
[16], 16);
2054 memcpy(fw_rev
, &pc
.buf
[32], 4);
2056 ide_fixstring(vendor_id
, 8, 0);
2057 ide_fixstring(product_id
, 16, 0);
2058 ide_fixstring(fw_rev
, 4, 0);
2060 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2061 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2065 * Ask the tape about its various parameters. In particular, we will adjust our
2066 * data transfer buffer size to the recommended value as returned by the tape.
2068 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2070 idetape_tape_t
*tape
= drive
->driver_data
;
2071 struct ide_atapi_pc pc
;
2073 u8 speed
, max_speed
;
2075 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2076 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2077 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2078 " some default values\n");
2079 tape
->blk_size
= 512;
2080 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2081 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2082 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2085 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2087 /* convert to host order and save for later use */
2088 speed
= be16_to_cpup((__be16
*)&caps
[14]);
2089 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
2091 *(u16
*)&caps
[8] = max_speed
;
2092 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
2093 *(u16
*)&caps
[14] = speed
;
2094 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
2097 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2098 "(assuming 650KB/sec)\n", drive
->name
);
2099 *(u16
*)&caps
[14] = 650;
2102 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2103 "(assuming 650KB/sec)\n", drive
->name
);
2104 *(u16
*)&caps
[8] = 650;
2107 memcpy(&tape
->caps
, caps
, 20);
2109 /* device lacks locking support according to capabilities page */
2110 if ((caps
[6] & 1) == 0)
2111 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
2114 tape
->blk_size
= 512;
2115 else if (caps
[7] & 0x04)
2116 tape
->blk_size
= 1024;
2119 #ifdef CONFIG_IDE_PROC_FS
2120 #define ide_tape_devset_get(name, field) \
2121 static int get_##name(ide_drive_t *drive) \
2123 idetape_tape_t *tape = drive->driver_data; \
2124 return tape->field; \
2127 #define ide_tape_devset_set(name, field) \
2128 static int set_##name(ide_drive_t *drive, int arg) \
2130 idetape_tape_t *tape = drive->driver_data; \
2131 tape->field = arg; \
2135 #define ide_tape_devset_rw_field(_name, _field) \
2136 ide_tape_devset_get(_name, _field) \
2137 ide_tape_devset_set(_name, _field) \
2138 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2140 #define ide_tape_devset_r_field(_name, _field) \
2141 ide_tape_devset_get(_name, _field) \
2142 IDE_DEVSET(_name, 0, get_##_name, NULL)
2144 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
2145 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
2146 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
2147 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
2149 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
2151 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
2152 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
2154 ide_tape_devset_r_field(avg_speed
, avg_speed
);
2155 ide_tape_devset_r_field(speed
, caps
[14]);
2156 ide_tape_devset_r_field(buffer
, caps
[16]);
2157 ide_tape_devset_r_field(buffer_size
, buffer_size
);
2159 static const struct ide_proc_devset idetape_settings
[] = {
2160 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
2161 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
2162 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
2163 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
2164 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
2165 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
2166 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
2167 mulf_tdsc
, divf_tdsc
),
2173 * The function below is called to:
2175 * 1. Initialize our various state variables.
2176 * 2. Ask the tape for its capabilities.
2177 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2178 * is chosen based on the recommendation which we received in step 2.
2180 * Note that at this point ide.c already assigned us an irq, so that we can
2181 * queue requests here and wait for their completion.
2183 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2188 u16
*ctl
= (u16
*)&tape
->caps
[12];
2190 drive
->pc_callback
= ide_tape_callback
;
2191 drive
->pc_update_buffers
= idetape_update_buffers
;
2192 drive
->pc_io_buffers
= ide_tape_io_buffers
;
2194 spin_lock_init(&tape
->lock
);
2196 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
2198 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2199 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2201 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2204 /* Seagate Travan drives do not support DSC overlap. */
2205 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
2206 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2208 tape
->minor
= minor
;
2209 tape
->name
[0] = 'h';
2210 tape
->name
[1] = 't';
2211 tape
->name
[2] = '0' + minor
;
2212 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2214 idetape_get_inquiry_results(drive
);
2215 idetape_get_mode_sense_results(drive
);
2216 ide_tape_get_bsize_from_bdesc(drive
);
2217 tape
->user_bs_factor
= 1;
2218 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2219 while (tape
->buffer_size
> 0xffff) {
2220 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2222 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2224 buffer_size
= tape
->buffer_size
;
2225 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2226 if (buffer_size
% PAGE_SIZE
) {
2227 tape
->pages_per_buffer
++;
2228 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2231 /* select the "best" DSC read/write polling freq */
2232 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2234 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2237 * Ensure that the number we got makes sense; limit it within
2238 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2240 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2241 IDETAPE_DSC_RW_MAX
);
2242 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2244 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2245 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2246 tape
->buffer_size
/ 1024,
2247 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2248 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
2250 ide_proc_register_driver(drive
, tape
->driver
);
2253 static void ide_tape_remove(ide_drive_t
*drive
)
2255 idetape_tape_t
*tape
= drive
->driver_data
;
2257 ide_proc_unregister_driver(drive
, tape
->driver
);
2259 ide_unregister_region(tape
->disk
);
2264 static void ide_tape_release(struct kref
*kref
)
2266 struct ide_tape_obj
*tape
= to_ide_drv(kref
, ide_tape_obj
);
2267 ide_drive_t
*drive
= tape
->drive
;
2268 struct gendisk
*g
= tape
->disk
;
2270 BUG_ON(tape
->merge_bh_size
);
2272 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2273 drive
->driver_data
= NULL
;
2274 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2275 device_destroy(idetape_sysfs_class
,
2276 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2277 idetape_devs
[tape
->minor
] = NULL
;
2278 g
->private_data
= NULL
;
2283 #ifdef CONFIG_IDE_PROC_FS
2284 static int proc_idetape_read_name
2285 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2287 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2288 idetape_tape_t
*tape
= drive
->driver_data
;
2292 len
= sprintf(out
, "%s\n", tape
->name
);
2293 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2296 static ide_proc_entry_t idetape_proc
[] = {
2297 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2298 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2299 { NULL
, 0, NULL
, NULL
}
2302 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
2304 return idetape_proc
;
2307 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
2309 return idetape_settings
;
2313 static int ide_tape_probe(ide_drive_t
*);
2315 static ide_driver_t idetape_driver
= {
2317 .owner
= THIS_MODULE
,
2319 .bus
= &ide_bus_type
,
2321 .probe
= ide_tape_probe
,
2322 .remove
= ide_tape_remove
,
2323 .version
= IDETAPE_VERSION
,
2324 .do_request
= idetape_do_request
,
2325 .end_request
= idetape_end_request
,
2326 .error
= __ide_error
,
2327 #ifdef CONFIG_IDE_PROC_FS
2328 .proc_entries
= ide_tape_proc_entries
,
2329 .proc_devsets
= ide_tape_proc_devsets
,
2333 /* Our character device supporting functions, passed to register_chrdev. */
2334 static const struct file_operations idetape_fops
= {
2335 .owner
= THIS_MODULE
,
2336 .read
= idetape_chrdev_read
,
2337 .write
= idetape_chrdev_write
,
2338 .ioctl
= idetape_chrdev_ioctl
,
2339 .open
= idetape_chrdev_open
,
2340 .release
= idetape_chrdev_release
,
2343 static int idetape_open(struct block_device
*bdev
, fmode_t mode
)
2345 struct ide_tape_obj
*tape
= ide_tape_get(bdev
->bd_disk
);
2353 static int idetape_release(struct gendisk
*disk
, fmode_t mode
)
2355 struct ide_tape_obj
*tape
= ide_drv_g(disk
, ide_tape_obj
);
2361 static int idetape_ioctl(struct block_device
*bdev
, fmode_t mode
,
2362 unsigned int cmd
, unsigned long arg
)
2364 struct ide_tape_obj
*tape
= ide_drv_g(bdev
->bd_disk
, ide_tape_obj
);
2365 ide_drive_t
*drive
= tape
->drive
;
2366 int err
= generic_ide_ioctl(drive
, bdev
, cmd
, arg
);
2368 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2372 static struct block_device_operations idetape_block_ops
= {
2373 .owner
= THIS_MODULE
,
2374 .open
= idetape_open
,
2375 .release
= idetape_release
,
2376 .locked_ioctl
= idetape_ioctl
,
2379 static int ide_tape_probe(ide_drive_t
*drive
)
2381 idetape_tape_t
*tape
;
2385 if (!strstr("ide-tape", drive
->driver_req
))
2388 if (drive
->media
!= ide_tape
)
2391 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) &&
2392 ide_check_atapi_device(drive
, DRV_NAME
) == 0) {
2393 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2394 " the driver\n", drive
->name
);
2397 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2399 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2404 g
= alloc_disk(1 << PARTN_BITS
);
2408 ide_init_disk(g
, drive
);
2410 kref_init(&tape
->kref
);
2412 tape
->drive
= drive
;
2413 tape
->driver
= &idetape_driver
;
2416 g
->private_data
= &tape
->driver
;
2418 drive
->driver_data
= tape
;
2420 mutex_lock(&idetape_ref_mutex
);
2421 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2423 idetape_devs
[minor
] = tape
;
2424 mutex_unlock(&idetape_ref_mutex
);
2426 idetape_setup(drive
, tape
, minor
);
2428 device_create(idetape_sysfs_class
, &drive
->gendev
,
2429 MKDEV(IDETAPE_MAJOR
, minor
), NULL
, "%s", tape
->name
);
2430 device_create(idetape_sysfs_class
, &drive
->gendev
,
2431 MKDEV(IDETAPE_MAJOR
, minor
+ 128), NULL
,
2434 g
->fops
= &idetape_block_ops
;
2435 ide_register_region(g
);
2445 static void __exit
idetape_exit(void)
2447 driver_unregister(&idetape_driver
.gen_driver
);
2448 class_destroy(idetape_sysfs_class
);
2449 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2452 static int __init
idetape_init(void)
2455 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2456 if (IS_ERR(idetape_sysfs_class
)) {
2457 idetape_sysfs_class
= NULL
;
2458 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2463 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2464 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2467 goto out_free_class
;
2470 error
= driver_register(&idetape_driver
.gen_driver
);
2472 goto out_free_driver
;
2477 driver_unregister(&idetape_driver
.gen_driver
);
2479 class_destroy(idetape_sysfs_class
);
2484 MODULE_ALIAS("ide:*m-tape*");
2485 module_init(idetape_init
);
2486 module_exit(idetape_exit
);
2487 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
2488 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2489 MODULE_LICENSE("GPL");