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 struct ide_driver
*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
= drive
->hwif
->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
->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 port 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
= drive
->hwif
->rq
;
589 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
592 static void ide_tape_handle_dsc(ide_drive_t
*drive
)
594 idetape_tape_t
*tape
= drive
->driver_data
;
596 /* Media access command */
597 tape
->dsc_polling_start
= jiffies
;
598 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
599 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
600 /* Allow ide.c to handle other requests */
601 idetape_postpone_request(drive
);
604 static int ide_tape_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
605 unsigned int bcount
, int write
)
608 idetape_output_buffers(drive
, pc
, bcount
);
610 idetape_input_buffers(drive
, pc
, bcount
);
616 * Packet Command Interface
618 * The current Packet Command is available in drive->pc, and will not change
619 * until we finish handling it. Each packet command is associated with a
620 * callback function that will be called when the command is finished.
622 * The handling will be done in three stages:
624 * 1. idetape_issue_pc will send the packet command to the drive, and will set
625 * the interrupt handler to ide_pc_intr.
627 * 2. On each interrupt, ide_pc_intr will be called. This step will be
628 * repeated until the device signals us that no more interrupts will be issued.
630 * 3. ATAPI Tape media access commands have immediate status with a delayed
631 * process. In case of a successful initiation of a media access packet command,
632 * the DSC bit will be set when the actual execution of the command is finished.
633 * Since the tape drive will not issue an interrupt, we have to poll for this
634 * event. In this case, we define the request as "low priority request" by
635 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
638 * ide.c will then give higher priority to requests which originate from the
639 * other device, until will change rq_status to RQ_ACTIVE.
641 * 4. When the packet command is finished, it will be checked for errors.
643 * 5. In case an error was found, we queue a request sense packet command in
644 * front of the request queue and retry the operation up to
645 * IDETAPE_MAX_PC_RETRIES times.
647 * 6. In case no error was found, or we decided to give up and not to retry
648 * again, the callback function will be called and then we will handle the next
652 static ide_startstop_t
idetape_issue_pc(ide_drive_t
*drive
,
653 struct ide_atapi_pc
*pc
)
655 idetape_tape_t
*tape
= drive
->driver_data
;
657 if (drive
->pc
->c
[0] == REQUEST_SENSE
&&
658 pc
->c
[0] == REQUEST_SENSE
) {
659 printk(KERN_ERR
"ide-tape: possible ide-tape.c bug - "
660 "Two request sense in serial were issued\n");
663 if (tape
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
664 tape
->failed_pc
= pc
;
666 /* Set the current packet command */
669 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
670 (pc
->flags
& PC_FLAG_ABORT
)) {
672 * We will "abort" retrying a packet command in case legitimate
673 * error code was received (crossing a filemark, or end of the
674 * media, for example).
676 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
677 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
678 tape
->sense_key
== 2 && tape
->asc
== 4 &&
679 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
680 printk(KERN_ERR
"ide-tape: %s: I/O error, "
681 "pc = %2x, key = %2x, "
682 "asc = %2x, ascq = %2x\n",
683 tape
->name
, pc
->c
[0],
684 tape
->sense_key
, tape
->asc
,
688 pc
->error
= IDETAPE_ERROR_GENERAL
;
690 tape
->failed_pc
= NULL
;
691 drive
->pc_callback(drive
, 0);
694 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
698 return ide_issue_pc(drive
);
701 /* A mode sense command is used to "sense" tape parameters. */
702 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
705 pc
->c
[0] = MODE_SENSE
;
706 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
707 /* DBD = 1 - Don't return block descriptors */
709 pc
->c
[2] = page_code
;
711 * Changed pc->c[3] to 0 (255 will at best return unused info).
713 * For SCSI this byte is defined as subpage instead of high byte
714 * of length and some IDE drives seem to interpret it this way
715 * and return an error when 255 is used.
718 /* We will just discard data in that case */
720 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
722 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
728 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
730 ide_hwif_t
*hwif
= drive
->hwif
;
731 idetape_tape_t
*tape
= drive
->driver_data
;
732 struct ide_atapi_pc
*pc
= drive
->pc
;
735 stat
= hwif
->tp_ops
->read_status(hwif
);
737 if (stat
& ATA_DSC
) {
738 if (stat
& ATA_ERR
) {
740 if (pc
->c
[0] != TEST_UNIT_READY
)
741 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
743 /* Retry operation */
744 ide_retry_pc(drive
, tape
->disk
);
749 pc
->error
= IDETAPE_ERROR_GENERAL
;
750 tape
->failed_pc
= NULL
;
752 drive
->pc_callback(drive
, 0);
756 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
757 struct ide_atapi_pc
*pc
, struct request
*rq
,
760 struct idetape_bh
*bh
= (struct idetape_bh
*)rq
->special
;
761 unsigned int length
= rq
->current_nr_sectors
;
764 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
768 pc
->buf_size
= length
* tape
->blk_size
;
769 pc
->req_xfer
= pc
->buf_size
;
770 if (pc
->req_xfer
== tape
->buffer_size
)
771 pc
->flags
|= PC_FLAG_DMA_OK
;
773 if (opcode
== READ_6
) {
775 atomic_set(&bh
->b_count
, 0);
776 } else if (opcode
== WRITE_6
) {
778 pc
->flags
|= PC_FLAG_WRITING
;
779 pc
->b_data
= bh
->b_data
;
780 pc
->b_count
= atomic_read(&bh
->b_count
);
783 memcpy(rq
->cmd
, pc
->c
, 12);
786 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
787 struct request
*rq
, sector_t block
)
789 ide_hwif_t
*hwif
= drive
->hwif
;
790 idetape_tape_t
*tape
= drive
->driver_data
;
791 struct ide_atapi_pc
*pc
= NULL
;
792 struct request
*postponed_rq
= tape
->postponed_rq
;
795 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %lu,"
796 " current_nr_sectors: %u\n",
797 (unsigned long long)rq
->sector
, rq
->nr_sectors
,
798 rq
->current_nr_sectors
);
800 if (!blk_special_request(rq
)) {
801 /* We do not support buffer cache originated requests. */
802 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
803 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
804 ide_end_request(drive
, 0, 0);
808 /* Retry a failed packet command */
809 if (tape
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
810 pc
= tape
->failed_pc
;
814 if (postponed_rq
!= NULL
)
815 if (rq
!= postponed_rq
) {
816 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
817 "Two DSC requests were queued\n");
818 idetape_end_request(drive
, 0, 0);
822 tape
->postponed_rq
= NULL
;
825 * If the tape is still busy, postpone our request and service
826 * the other device meanwhile.
828 stat
= hwif
->tp_ops
->read_status(hwif
);
830 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
831 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
832 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
834 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
835 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
836 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
839 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
840 (stat
& ATA_DSC
) == 0) {
841 if (postponed_rq
== NULL
) {
842 tape
->dsc_polling_start
= jiffies
;
843 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
844 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
845 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
846 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
848 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
849 idetape_media_access_finished(drive
);
852 return ide_do_reset(drive
);
854 } else if (time_after(jiffies
,
855 tape
->dsc_polling_start
+
856 IDETAPE_DSC_MA_THRESHOLD
))
857 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
858 idetape_postpone_request(drive
);
861 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
862 pc
= &tape
->queued_pc
;
863 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
866 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
867 pc
= &tape
->queued_pc
;
868 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
871 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
872 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
873 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
874 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
877 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
878 idetape_media_access_finished(drive
);
884 return idetape_issue_pc(drive
, pc
);
888 * The function below uses __get_free_pages to allocate a data buffer of size
889 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
892 * It returns a pointer to the newly allocated buffer, or NULL in case of
895 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
898 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
899 int pages
= tape
->pages_per_buffer
;
900 unsigned int order
, b_allocd
;
903 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
908 order
= fls(pages
) - 1;
909 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
912 b_allocd
= (1 << order
) * PAGE_SIZE
;
916 memset(bh
->b_data
, 0, b_allocd
);
917 bh
->b_reqnext
= NULL
;
918 bh
->b_size
= b_allocd
;
919 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
922 order
= fls(pages
) - 1;
923 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
926 b_allocd
= (1 << order
) * PAGE_SIZE
;
929 memset(b_data
, 0, b_allocd
);
931 /* newly allocated page frames below buffer header or ...*/
932 if (bh
->b_data
== b_data
+ b_allocd
) {
933 bh
->b_size
+= b_allocd
;
934 bh
->b_data
-= b_allocd
;
936 atomic_add(b_allocd
, &bh
->b_count
);
939 /* they are above the header */
940 if (b_data
== bh
->b_data
+ bh
->b_size
) {
941 bh
->b_size
+= b_allocd
;
943 atomic_add(b_allocd
, &bh
->b_count
);
947 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
949 free_pages((unsigned long) b_data
, order
);
952 bh
->b_reqnext
= NULL
;
954 bh
->b_size
= b_allocd
;
955 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
956 prev_bh
->b_reqnext
= bh
;
961 bh
->b_size
-= tape
->excess_bh_size
;
963 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
966 ide_tape_kfree_buffer(tape
);
970 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
971 const char __user
*buf
, int n
)
973 struct idetape_bh
*bh
= tape
->bh
;
979 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
983 count
= min((unsigned int)
984 (bh
->b_size
- atomic_read(&bh
->b_count
)),
986 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
990 atomic_add(count
, &bh
->b_count
);
992 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
995 atomic_set(&bh
->b_count
, 0);
1002 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
1005 struct idetape_bh
*bh
= tape
->bh
;
1011 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
1015 count
= min(tape
->b_count
, n
);
1016 if (copy_to_user(buf
, tape
->b_data
, count
))
1019 tape
->b_data
+= count
;
1020 tape
->b_count
-= count
;
1022 if (!tape
->b_count
) {
1026 tape
->b_data
= bh
->b_data
;
1027 tape
->b_count
= atomic_read(&bh
->b_count
);
1034 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
1036 struct idetape_bh
*bh
= tape
->merge_bh
;
1037 tape
->bh
= tape
->merge_bh
;
1039 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1040 atomic_set(&bh
->b_count
, 0);
1042 tape
->b_data
= bh
->b_data
;
1043 tape
->b_count
= atomic_read(&bh
->b_count
);
1048 * Write a filemark if write_filemark=1. Flush the device buffers without
1049 * writing a filemark otherwise.
1051 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1052 struct ide_atapi_pc
*pc
, int write_filemark
)
1055 pc
->c
[0] = WRITE_FILEMARKS
;
1056 pc
->c
[4] = write_filemark
;
1057 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1060 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1062 idetape_tape_t
*tape
= drive
->driver_data
;
1063 struct gendisk
*disk
= tape
->disk
;
1064 int load_attempted
= 0;
1066 /* Wait for the tape to become ready */
1067 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1069 while (time_before(jiffies
, timeout
)) {
1070 if (ide_do_test_unit_ready(drive
, disk
) == 0)
1072 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1073 || (tape
->asc
== 0x3A)) {
1077 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1079 /* not about to be ready */
1080 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1081 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1088 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1090 struct ide_tape_obj
*tape
= drive
->driver_data
;
1091 struct ide_atapi_pc pc
;
1094 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1095 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
1098 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1102 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1105 pc
->c
[0] = READ_POSITION
;
1109 static int idetape_read_position(ide_drive_t
*drive
)
1111 idetape_tape_t
*tape
= drive
->driver_data
;
1112 struct ide_atapi_pc pc
;
1115 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1117 idetape_create_read_position_cmd(&pc
);
1118 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
1120 position
= tape
->first_frame
;
1124 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1125 struct ide_atapi_pc
*pc
,
1126 unsigned int block
, u8 partition
, int skip
)
1129 pc
->c
[0] = POSITION_TO_ELEMENT
;
1131 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1132 pc
->c
[8] = partition
;
1133 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1136 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1138 idetape_tape_t
*tape
= drive
->driver_data
;
1140 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1143 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
1144 tape
->merge_bh_size
= 0;
1145 if (tape
->merge_bh
!= NULL
) {
1146 ide_tape_kfree_buffer(tape
);
1147 tape
->merge_bh
= NULL
;
1150 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1154 * Position the tape to the requested block using the LOCATE packet command.
1155 * A READ POSITION command is then issued to check where we are positioned. Like
1156 * all higher level operations, we queue the commands at the tail of the request
1157 * queue and wait for their completion.
1159 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1160 u8 partition
, int skip
)
1162 idetape_tape_t
*tape
= drive
->driver_data
;
1163 struct gendisk
*disk
= tape
->disk
;
1165 struct ide_atapi_pc pc
;
1167 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1168 __ide_tape_discard_merge_buffer(drive
);
1169 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1170 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1171 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1175 idetape_create_read_position_cmd(&pc
);
1176 return ide_queue_pc_tail(drive
, disk
, &pc
);
1179 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1180 int restore_position
)
1182 idetape_tape_t
*tape
= drive
->driver_data
;
1185 __ide_tape_discard_merge_buffer(drive
);
1186 if (restore_position
) {
1187 position
= idetape_read_position(drive
);
1188 seek
= position
> 0 ? position
: 0;
1189 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1190 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1191 " %s\n", tape
->name
, __func__
);
1198 * Generate a read/write request for the block device interface and wait for it
1201 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1202 struct idetape_bh
*bh
)
1204 idetape_tape_t
*tape
= drive
->driver_data
;
1208 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1210 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1211 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1213 rq
->rq_disk
= tape
->disk
;
1214 rq
->special
= (void *)bh
;
1215 rq
->sector
= tape
->first_frame
;
1216 rq
->nr_sectors
= blocks
;
1217 rq
->current_nr_sectors
= blocks
;
1218 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1220 errors
= rq
->errors
;
1221 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1222 blk_put_request(rq
);
1224 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1228 idetape_init_merge_buffer(tape
);
1229 if (errors
== IDETAPE_ERROR_GENERAL
)
1234 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1242 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1243 struct ide_atapi_pc
*pc
)
1246 pc
->c
[0] = REZERO_UNIT
;
1247 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1250 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1255 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1258 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1262 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1264 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1267 /* Queue up a character device originated write request. */
1268 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1270 idetape_tape_t
*tape
= drive
->driver_data
;
1272 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1274 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1275 blocks
, tape
->merge_bh
);
1278 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1280 idetape_tape_t
*tape
= drive
->driver_data
;
1282 struct idetape_bh
*bh
;
1284 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1285 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1286 " but we are not writing.\n");
1289 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1290 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1291 tape
->merge_bh_size
= tape
->buffer_size
;
1293 if (tape
->merge_bh_size
) {
1294 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1295 if (tape
->merge_bh_size
% tape
->blk_size
) {
1299 i
= tape
->blk_size
- tape
->merge_bh_size
%
1301 bh
= tape
->bh
->b_reqnext
;
1303 atomic_set(&bh
->b_count
, 0);
1309 printk(KERN_INFO
"ide-tape: bug,"
1313 min
= min(i
, (unsigned int)(bh
->b_size
-
1314 atomic_read(&bh
->b_count
)));
1315 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1317 atomic_add(min
, &bh
->b_count
);
1322 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1323 tape
->merge_bh_size
= 0;
1325 if (tape
->merge_bh
!= NULL
) {
1326 ide_tape_kfree_buffer(tape
);
1327 tape
->merge_bh
= NULL
;
1329 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1332 static int idetape_init_read(ide_drive_t
*drive
)
1334 idetape_tape_t
*tape
= drive
->driver_data
;
1337 /* Initialize read operation */
1338 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1339 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1340 ide_tape_flush_merge_buffer(drive
);
1341 idetape_flush_tape_buffers(drive
);
1343 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1344 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1346 tape
->merge_bh_size
= 0;
1348 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1349 if (!tape
->merge_bh
)
1351 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1354 * Issue a read 0 command to ensure that DSC handshake is
1355 * switched from completion mode to buffer available mode.
1356 * No point in issuing this if DSC overlap isn't supported, some
1357 * drives (Seagate STT3401A) will return an error.
1359 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1360 bytes_read
= idetape_queue_rw_tail(drive
,
1361 REQ_IDETAPE_READ
, 0,
1363 if (bytes_read
< 0) {
1364 ide_tape_kfree_buffer(tape
);
1365 tape
->merge_bh
= NULL
;
1366 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1375 /* called from idetape_chrdev_read() to service a chrdev read request. */
1376 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1378 idetape_tape_t
*tape
= drive
->driver_data
;
1380 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1382 /* If we are at a filemark, return a read length of 0 */
1383 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1386 idetape_init_read(drive
);
1388 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1392 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1394 idetape_tape_t
*tape
= drive
->driver_data
;
1395 struct idetape_bh
*bh
;
1401 bh
= tape
->merge_bh
;
1402 count
= min(tape
->buffer_size
, bcount
);
1404 blocks
= count
/ tape
->blk_size
;
1406 atomic_set(&bh
->b_count
,
1407 min(count
, (unsigned int)bh
->b_size
));
1408 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1409 count
-= atomic_read(&bh
->b_count
);
1412 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1418 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1419 * currently support only one partition.
1421 static int idetape_rewind_tape(ide_drive_t
*drive
)
1423 struct ide_tape_obj
*tape
= drive
->driver_data
;
1424 struct gendisk
*disk
= tape
->disk
;
1426 struct ide_atapi_pc pc
;
1428 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1430 idetape_create_rewind_cmd(drive
, &pc
);
1431 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1435 idetape_create_read_position_cmd(&pc
);
1436 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1442 /* mtio.h compatible commands should be issued to the chrdev interface. */
1443 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1446 idetape_tape_t
*tape
= drive
->driver_data
;
1447 void __user
*argp
= (void __user
*)arg
;
1449 struct idetape_config
{
1450 int dsc_rw_frequency
;
1451 int dsc_media_access_frequency
;
1455 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1459 if (copy_from_user(&config
, argp
, sizeof(config
)))
1461 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1464 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1465 config
.nr_stages
= 1;
1466 if (copy_to_user(argp
, &config
, sizeof(config
)))
1475 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1478 idetape_tape_t
*tape
= drive
->driver_data
;
1479 struct gendisk
*disk
= tape
->disk
;
1480 struct ide_atapi_pc pc
;
1481 int retval
, count
= 0;
1482 int sprev
= !!(tape
->caps
[4] & 0x20);
1486 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1489 mt_count
= -mt_count
;
1492 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1493 tape
->merge_bh_size
= 0;
1494 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1496 ide_tape_discard_merge_buffer(drive
, 0);
1502 idetape_create_space_cmd(&pc
, mt_count
- count
,
1503 IDETAPE_SPACE_OVER_FILEMARK
);
1504 return ide_queue_pc_tail(drive
, disk
, &pc
);
1509 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1513 count
= (MTBSFM
== mt_op
? 1 : -1);
1514 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1516 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1523 * Our character device read / write functions.
1525 * The tape is optimized to maximize throughput when it is transferring an
1526 * integral number of the "continuous transfer limit", which is a parameter of
1527 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1529 * As of version 1.3 of the driver, the character device provides an abstract
1530 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1531 * same backup/restore procedure is supported. The driver will internally
1532 * convert the requests to the recommended transfer unit, so that an unmatch
1533 * between the user's block size to the recommended size will only result in a
1534 * (slightly) increased driver overhead, but will no longer hit performance.
1535 * This is not applicable to Onstream.
1537 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1538 size_t count
, loff_t
*ppos
)
1540 struct ide_tape_obj
*tape
= file
->private_data
;
1541 ide_drive_t
*drive
= tape
->drive
;
1542 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
1544 u16 ctl
= *(u16
*)&tape
->caps
[12];
1546 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1548 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1549 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1550 if (count
> tape
->blk_size
&&
1551 (count
% tape
->blk_size
) == 0)
1552 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1554 rc
= idetape_init_read(drive
);
1559 if (tape
->merge_bh_size
) {
1560 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
1561 (unsigned int)count
);
1562 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
1564 buf
+= actually_read
;
1565 tape
->merge_bh_size
-= actually_read
;
1566 count
-= actually_read
;
1568 while (count
>= tape
->buffer_size
) {
1569 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1570 if (bytes_read
<= 0)
1572 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
1575 count
-= bytes_read
;
1576 actually_read
+= bytes_read
;
1579 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1580 if (bytes_read
<= 0)
1582 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
1583 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
1585 actually_read
+= temp
;
1586 tape
->merge_bh_size
= bytes_read
-temp
;
1589 if (!actually_read
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1590 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1592 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1596 return ret
? ret
: actually_read
;
1599 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1600 size_t count
, loff_t
*ppos
)
1602 struct ide_tape_obj
*tape
= file
->private_data
;
1603 ide_drive_t
*drive
= tape
->drive
;
1604 ssize_t actually_written
= 0;
1606 u16 ctl
= *(u16
*)&tape
->caps
[12];
1608 /* The drive is write protected. */
1609 if (tape
->write_prot
)
1612 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1614 /* Initialize write operation */
1615 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1616 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1617 ide_tape_discard_merge_buffer(drive
, 1);
1618 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1619 printk(KERN_ERR
"ide-tape: merge_bh_size "
1620 "should be 0 now\n");
1621 tape
->merge_bh_size
= 0;
1623 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1624 if (!tape
->merge_bh
)
1626 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
1627 idetape_init_merge_buffer(tape
);
1630 * Issue a write 0 command to ensure that DSC handshake is
1631 * switched from completion mode to buffer available mode. No
1632 * point in issuing this if DSC overlap isn't supported, some
1633 * drives (Seagate STT3401A) will return an error.
1635 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1636 ssize_t retval
= idetape_queue_rw_tail(drive
,
1637 REQ_IDETAPE_WRITE
, 0,
1640 ide_tape_kfree_buffer(tape
);
1641 tape
->merge_bh
= NULL
;
1642 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1649 if (tape
->merge_bh_size
) {
1650 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
1651 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
1652 tape
->merge_bh_size
= 0;
1654 actually_written
= min((unsigned int)
1655 (tape
->buffer_size
- tape
->merge_bh_size
),
1656 (unsigned int)count
);
1657 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
1659 buf
+= actually_written
;
1660 tape
->merge_bh_size
+= actually_written
;
1661 count
-= actually_written
;
1663 if (tape
->merge_bh_size
== tape
->buffer_size
) {
1665 tape
->merge_bh_size
= 0;
1666 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1671 while (count
>= tape
->buffer_size
) {
1673 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
1675 buf
+= tape
->buffer_size
;
1676 count
-= tape
->buffer_size
;
1677 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1678 actually_written
+= tape
->buffer_size
;
1683 actually_written
+= count
;
1684 if (idetape_copy_stage_from_user(tape
, buf
, count
))
1686 tape
->merge_bh_size
+= count
;
1688 return ret
? ret
: actually_written
;
1691 static int idetape_write_filemark(ide_drive_t
*drive
)
1693 struct ide_tape_obj
*tape
= drive
->driver_data
;
1694 struct ide_atapi_pc pc
;
1696 /* Write a filemark */
1697 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1698 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1699 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1706 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1709 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1710 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1711 * usually not supported.
1713 * The following commands are currently not supported:
1715 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1716 * MT_ST_WRITE_THRESHOLD.
1718 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1720 idetape_tape_t
*tape
= drive
->driver_data
;
1721 struct gendisk
*disk
= tape
->disk
;
1722 struct ide_atapi_pc pc
;
1725 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1735 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1742 if (tape
->write_prot
)
1744 ide_tape_discard_merge_buffer(drive
, 1);
1745 for (i
= 0; i
< mt_count
; i
++) {
1746 retval
= idetape_write_filemark(drive
);
1752 ide_tape_discard_merge_buffer(drive
, 0);
1753 if (idetape_rewind_tape(drive
))
1757 ide_tape_discard_merge_buffer(drive
, 0);
1758 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1762 * If door is locked, attempt to unlock before
1763 * attempting to eject.
1765 if (tape
->door_locked
) {
1766 if (!ide_set_media_lock(drive
, disk
, 0))
1767 tape
->door_locked
= DOOR_UNLOCKED
;
1769 ide_tape_discard_merge_buffer(drive
, 0);
1770 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1772 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1775 ide_tape_discard_merge_buffer(drive
, 0);
1776 return idetape_flush_tape_buffers(drive
);
1778 ide_tape_discard_merge_buffer(drive
, 0);
1779 return ide_do_start_stop(drive
, disk
,
1780 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1782 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1783 return ide_queue_pc_tail(drive
, disk
, &pc
);
1785 (void)idetape_rewind_tape(drive
);
1786 idetape_create_erase_cmd(&pc
);
1787 return ide_queue_pc_tail(drive
, disk
, &pc
);
1790 if (mt_count
< tape
->blk_size
||
1791 mt_count
% tape
->blk_size
)
1793 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1794 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1796 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1799 ide_tape_discard_merge_buffer(drive
, 0);
1800 return idetape_position_tape(drive
,
1801 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1803 ide_tape_discard_merge_buffer(drive
, 0);
1804 return idetape_position_tape(drive
, 0, mt_count
, 0);
1808 retval
= ide_set_media_lock(drive
, disk
, 1);
1811 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1814 retval
= ide_set_media_lock(drive
, disk
, 0);
1817 tape
->door_locked
= DOOR_UNLOCKED
;
1820 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1827 * Our character device ioctls. General mtio.h magnetic io commands are
1828 * supported here, and not in the corresponding block interface. Our own
1829 * ide-tape ioctls are supported on both interfaces.
1831 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1832 unsigned int cmd
, unsigned long arg
)
1834 struct ide_tape_obj
*tape
= file
->private_data
;
1835 ide_drive_t
*drive
= tape
->drive
;
1839 int block_offset
= 0, position
= tape
->first_frame
;
1840 void __user
*argp
= (void __user
*)arg
;
1842 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1844 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1845 ide_tape_flush_merge_buffer(drive
);
1846 idetape_flush_tape_buffers(drive
);
1848 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1849 block_offset
= tape
->merge_bh_size
/
1850 (tape
->blk_size
* tape
->user_bs_factor
);
1851 position
= idetape_read_position(drive
);
1857 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1859 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1861 memset(&mtget
, 0, sizeof(struct mtget
));
1862 mtget
.mt_type
= MT_ISSCSI2
;
1863 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1865 ((tape
->blk_size
* tape
->user_bs_factor
)
1866 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1868 if (tape
->drv_write_prot
)
1869 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1871 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1875 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1876 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1880 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1881 ide_tape_discard_merge_buffer(drive
, 1);
1882 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1887 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1888 * block size with the reported value.
1890 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1892 idetape_tape_t
*tape
= drive
->driver_data
;
1893 struct ide_atapi_pc pc
;
1895 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1896 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1897 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1898 if (tape
->blk_size
== 0) {
1899 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1900 "block size, assuming 32k\n");
1901 tape
->blk_size
= 32768;
1905 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1906 (pc
.buf
[4 + 6] << 8) +
1908 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1911 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1913 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1915 idetape_tape_t
*tape
;
1918 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1922 tape
= ide_tape_chrdev_get(i
);
1928 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1931 * We really want to do nonseekable_open(inode, filp); here, but some
1932 * versions of tar incorrectly call lseek on tapes and bail out if that
1933 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1935 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1937 drive
= tape
->drive
;
1939 filp
->private_data
= tape
;
1941 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1946 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1948 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1949 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1953 idetape_read_position(drive
);
1954 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1955 (void)idetape_rewind_tape(drive
);
1957 /* Read block size and write protect status from drive. */
1958 ide_tape_get_bsize_from_bdesc(drive
);
1960 /* Set write protect flag if device is opened as read-only. */
1961 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1962 tape
->write_prot
= 1;
1964 tape
->write_prot
= tape
->drv_write_prot
;
1966 /* Make sure drive isn't write protected if user wants to write. */
1967 if (tape
->write_prot
) {
1968 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1969 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1970 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1976 /* Lock the tape drive door so user can't eject. */
1977 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1978 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1979 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1980 tape
->door_locked
= DOOR_LOCKED
;
1992 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1994 idetape_tape_t
*tape
= drive
->driver_data
;
1996 ide_tape_flush_merge_buffer(drive
);
1997 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
1998 if (tape
->merge_bh
!= NULL
) {
1999 idetape_pad_zeros(drive
, tape
->blk_size
*
2000 (tape
->user_bs_factor
- 1));
2001 ide_tape_kfree_buffer(tape
);
2002 tape
->merge_bh
= NULL
;
2004 idetape_write_filemark(drive
);
2005 idetape_flush_tape_buffers(drive
);
2006 idetape_flush_tape_buffers(drive
);
2009 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
2011 struct ide_tape_obj
*tape
= filp
->private_data
;
2012 ide_drive_t
*drive
= tape
->drive
;
2013 unsigned int minor
= iminor(inode
);
2016 tape
= drive
->driver_data
;
2018 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
2020 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
2021 idetape_write_release(drive
, minor
);
2022 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2024 ide_tape_discard_merge_buffer(drive
, 1);
2027 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
2028 (void) idetape_rewind_tape(drive
);
2029 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2030 if (tape
->door_locked
== DOOR_LOCKED
) {
2031 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
2032 tape
->door_locked
= DOOR_UNLOCKED
;
2035 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
2041 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2043 idetape_tape_t
*tape
= drive
->driver_data
;
2044 struct ide_atapi_pc pc
;
2045 char fw_rev
[4], vendor_id
[8], product_id
[16];
2047 idetape_create_inquiry_cmd(&pc
);
2048 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2049 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2053 memcpy(vendor_id
, &pc
.buf
[8], 8);
2054 memcpy(product_id
, &pc
.buf
[16], 16);
2055 memcpy(fw_rev
, &pc
.buf
[32], 4);
2057 ide_fixstring(vendor_id
, 8, 0);
2058 ide_fixstring(product_id
, 16, 0);
2059 ide_fixstring(fw_rev
, 4, 0);
2061 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2062 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2066 * Ask the tape about its various parameters. In particular, we will adjust our
2067 * data transfer buffer size to the recommended value as returned by the tape.
2069 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2071 idetape_tape_t
*tape
= drive
->driver_data
;
2072 struct ide_atapi_pc pc
;
2074 u8 speed
, max_speed
;
2076 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2077 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2078 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2079 " some default values\n");
2080 tape
->blk_size
= 512;
2081 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2082 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2083 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2086 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2088 /* convert to host order and save for later use */
2089 speed
= be16_to_cpup((__be16
*)&caps
[14]);
2090 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
2092 *(u16
*)&caps
[8] = max_speed
;
2093 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
2094 *(u16
*)&caps
[14] = speed
;
2095 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
2098 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2099 "(assuming 650KB/sec)\n", drive
->name
);
2100 *(u16
*)&caps
[14] = 650;
2103 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2104 "(assuming 650KB/sec)\n", drive
->name
);
2105 *(u16
*)&caps
[8] = 650;
2108 memcpy(&tape
->caps
, caps
, 20);
2110 /* device lacks locking support according to capabilities page */
2111 if ((caps
[6] & 1) == 0)
2112 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
2115 tape
->blk_size
= 512;
2116 else if (caps
[7] & 0x04)
2117 tape
->blk_size
= 1024;
2120 #ifdef CONFIG_IDE_PROC_FS
2121 #define ide_tape_devset_get(name, field) \
2122 static int get_##name(ide_drive_t *drive) \
2124 idetape_tape_t *tape = drive->driver_data; \
2125 return tape->field; \
2128 #define ide_tape_devset_set(name, field) \
2129 static int set_##name(ide_drive_t *drive, int arg) \
2131 idetape_tape_t *tape = drive->driver_data; \
2132 tape->field = arg; \
2136 #define ide_tape_devset_rw_field(_name, _field) \
2137 ide_tape_devset_get(_name, _field) \
2138 ide_tape_devset_set(_name, _field) \
2139 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2141 #define ide_tape_devset_r_field(_name, _field) \
2142 ide_tape_devset_get(_name, _field) \
2143 IDE_DEVSET(_name, 0, get_##_name, NULL)
2145 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
2146 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
2147 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
2148 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
2150 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
2152 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
2153 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
2155 ide_tape_devset_r_field(avg_speed
, avg_speed
);
2156 ide_tape_devset_r_field(speed
, caps
[14]);
2157 ide_tape_devset_r_field(buffer
, caps
[16]);
2158 ide_tape_devset_r_field(buffer_size
, buffer_size
);
2160 static const struct ide_proc_devset idetape_settings
[] = {
2161 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
2162 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
2163 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
2164 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
2165 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
2166 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
2167 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
2168 mulf_tdsc
, divf_tdsc
),
2174 * The function below is called to:
2176 * 1. Initialize our various state variables.
2177 * 2. Ask the tape for its capabilities.
2178 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2179 * is chosen based on the recommendation which we received in step 2.
2181 * Note that at this point ide.c already assigned us an irq, so that we can
2182 * queue requests here and wait for their completion.
2184 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2189 u16
*ctl
= (u16
*)&tape
->caps
[12];
2191 drive
->pc_callback
= ide_tape_callback
;
2192 drive
->pc_update_buffers
= idetape_update_buffers
;
2193 drive
->pc_io_buffers
= ide_tape_io_buffers
;
2195 spin_lock_init(&tape
->lock
);
2197 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
2199 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2200 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2202 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2205 /* Seagate Travan drives do not support DSC overlap. */
2206 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
2207 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2209 tape
->minor
= minor
;
2210 tape
->name
[0] = 'h';
2211 tape
->name
[1] = 't';
2212 tape
->name
[2] = '0' + minor
;
2213 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2215 idetape_get_inquiry_results(drive
);
2216 idetape_get_mode_sense_results(drive
);
2217 ide_tape_get_bsize_from_bdesc(drive
);
2218 tape
->user_bs_factor
= 1;
2219 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2220 while (tape
->buffer_size
> 0xffff) {
2221 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2223 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2225 buffer_size
= tape
->buffer_size
;
2226 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2227 if (buffer_size
% PAGE_SIZE
) {
2228 tape
->pages_per_buffer
++;
2229 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2232 /* select the "best" DSC read/write polling freq */
2233 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2235 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2238 * Ensure that the number we got makes sense; limit it within
2239 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2241 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2242 IDETAPE_DSC_RW_MAX
);
2243 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2245 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2246 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2247 tape
->buffer_size
/ 1024,
2248 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2249 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
2251 ide_proc_register_driver(drive
, tape
->driver
);
2254 static void ide_tape_remove(ide_drive_t
*drive
)
2256 idetape_tape_t
*tape
= drive
->driver_data
;
2258 ide_proc_unregister_driver(drive
, tape
->driver
);
2260 ide_unregister_region(tape
->disk
);
2265 static void ide_tape_release(struct kref
*kref
)
2267 struct ide_tape_obj
*tape
= to_ide_drv(kref
, ide_tape_obj
);
2268 ide_drive_t
*drive
= tape
->drive
;
2269 struct gendisk
*g
= tape
->disk
;
2271 BUG_ON(tape
->merge_bh_size
);
2273 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2274 drive
->driver_data
= NULL
;
2275 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2276 device_destroy(idetape_sysfs_class
,
2277 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2278 idetape_devs
[tape
->minor
] = NULL
;
2279 g
->private_data
= NULL
;
2284 #ifdef CONFIG_IDE_PROC_FS
2285 static int proc_idetape_read_name
2286 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2288 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2289 idetape_tape_t
*tape
= drive
->driver_data
;
2293 len
= sprintf(out
, "%s\n", tape
->name
);
2294 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2297 static ide_proc_entry_t idetape_proc
[] = {
2298 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2299 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2300 { NULL
, 0, NULL
, NULL
}
2303 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
2305 return idetape_proc
;
2308 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
2310 return idetape_settings
;
2314 static int ide_tape_probe(ide_drive_t
*);
2316 static struct ide_driver idetape_driver
= {
2318 .owner
= THIS_MODULE
,
2320 .bus
= &ide_bus_type
,
2322 .probe
= ide_tape_probe
,
2323 .remove
= ide_tape_remove
,
2324 .version
= IDETAPE_VERSION
,
2325 .do_request
= idetape_do_request
,
2326 .end_request
= idetape_end_request
,
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");