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 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
156 #define IDETAPE_BLOCK_DESCRIPTOR 0
157 #define IDETAPE_CAPABILITIES_PAGE 0x2a
160 * Most of our global data which we need to save even as we leave the driver due
161 * to an interrupt or a timer event is stored in the struct defined below.
163 typedef struct ide_tape_obj
{
165 struct ide_driver
*driver
;
166 struct gendisk
*disk
;
169 /* used by REQ_IDETAPE_{READ,WRITE} requests */
170 struct ide_atapi_pc queued_pc
;
173 * DSC polling variables.
175 * While polling for DSC we use postponed_rq to postpone the current
176 * request so that ide.c will be able to service pending requests on the
177 * other device. Note that at most we will have only one DSC (usually
178 * data transfer) request in the device request queue.
180 struct request
*postponed_rq
;
181 /* The time in which we started polling for DSC */
182 unsigned long dsc_polling_start
;
183 /* Timer used to poll for dsc */
184 struct timer_list dsc_timer
;
185 /* Read/Write dsc polling frequency */
186 unsigned long best_dsc_rw_freq
;
187 unsigned long dsc_poll_freq
;
188 unsigned long dsc_timeout
;
190 /* Read position information */
193 unsigned int first_frame
;
195 /* Last error information */
196 u8 sense_key
, asc
, ascq
;
198 /* Character device operation */
202 /* Current character device data transfer direction */
205 /* tape block size, usually 512 or 1024 bytes */
206 unsigned short blk_size
;
209 /* Copy of the tape's Capabilities and Mechanical Page */
213 * Active data transfer request parameters.
215 * At most, there is only one ide-tape originated data transfer request
216 * in the device request queue. This allows ide.c to easily service
217 * requests from the other device when we postpone our active request.
220 /* Data buffer size chosen based on the tape's recommendation */
223 struct idetape_bh
*merge_bh
;
224 /* size of the merge buffer */
226 /* pointer to current buffer head within the merge buffer */
227 struct idetape_bh
*bh
;
231 int pages_per_buffer
;
232 /* Wasted space in each stage */
235 /* Measures average tape speed */
236 unsigned long avg_time
;
240 /* the door is currently locked */
242 /* the tape hardware is write protected */
244 /* the tape is write protected (hardware or opened as read-only) */
250 static DEFINE_MUTEX(idetape_ref_mutex
);
252 static struct class *idetape_sysfs_class
;
254 static void ide_tape_release(struct device
*);
256 static struct ide_tape_obj
*ide_tape_get(struct gendisk
*disk
)
258 struct ide_tape_obj
*tape
= NULL
;
260 mutex_lock(&idetape_ref_mutex
);
261 tape
= ide_drv_g(disk
, ide_tape_obj
);
263 if (ide_device_get(tape
->drive
))
266 get_device(&tape
->dev
);
268 mutex_unlock(&idetape_ref_mutex
);
272 static void ide_tape_put(struct ide_tape_obj
*tape
)
274 ide_drive_t
*drive
= tape
->drive
;
276 mutex_lock(&idetape_ref_mutex
);
277 put_device(&tape
->dev
);
278 ide_device_put(drive
);
279 mutex_unlock(&idetape_ref_mutex
);
283 * The variables below are used for the character device interface. Additional
284 * state variables are defined in our ide_drive_t structure.
286 static struct ide_tape_obj
*idetape_devs
[MAX_HWIFS
* MAX_DRIVES
];
288 static struct ide_tape_obj
*ide_tape_chrdev_get(unsigned int i
)
290 struct ide_tape_obj
*tape
= NULL
;
292 mutex_lock(&idetape_ref_mutex
);
293 tape
= idetape_devs
[i
];
295 get_device(&tape
->dev
);
296 mutex_unlock(&idetape_ref_mutex
);
300 static int idetape_input_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
303 struct idetape_bh
*bh
= pc
->bh
;
310 (unsigned int)(bh
->b_size
- atomic_read(&bh
->b_count
)),
312 drive
->hwif
->tp_ops
->input_data(drive
, NULL
, bh
->b_data
+
313 atomic_read(&bh
->b_count
), count
);
315 atomic_add(count
, &bh
->b_count
);
316 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
319 atomic_set(&bh
->b_count
, 0);
328 static int idetape_output_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
331 struct idetape_bh
*bh
= pc
->bh
;
337 count
= min((unsigned int)pc
->b_count
, (unsigned int)bcount
);
338 drive
->hwif
->tp_ops
->output_data(drive
, NULL
, pc
->b_data
, count
);
341 pc
->b_count
-= count
;
346 pc
->b_data
= bh
->b_data
;
347 pc
->b_count
= atomic_read(&bh
->b_count
);
355 static void idetape_update_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
)
357 struct idetape_bh
*bh
= pc
->bh
;
359 unsigned int bcount
= pc
->xferred
;
361 if (pc
->flags
& PC_FLAG_WRITING
)
365 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
369 count
= min((unsigned int)bh
->b_size
, (unsigned int)bcount
);
370 atomic_set(&bh
->b_count
, count
);
371 if (atomic_read(&bh
->b_count
) == bh
->b_size
)
379 * called on each failed packet command retry to analyze the request sense. We
380 * currently do not utilize this information.
382 static void idetape_analyze_error(ide_drive_t
*drive
, u8
*sense
)
384 idetape_tape_t
*tape
= drive
->driver_data
;
385 struct ide_atapi_pc
*pc
= drive
->failed_pc
;
387 tape
->sense_key
= sense
[2] & 0xF;
388 tape
->asc
= sense
[12];
389 tape
->ascq
= sense
[13];
391 debug_log(DBG_ERR
, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
392 pc
->c
[0], tape
->sense_key
, tape
->asc
, tape
->ascq
);
394 /* Correct pc->xferred by asking the tape. */
395 if (pc
->flags
& PC_FLAG_DMA_ERROR
) {
396 pc
->xferred
= pc
->req_xfer
-
398 get_unaligned_be32(&sense
[3]);
399 idetape_update_buffers(drive
, pc
);
403 * If error was the result of a zero-length read or write command,
404 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
405 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
407 if ((pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
)
409 && pc
->c
[4] == 0 && pc
->c
[3] == 0 && pc
->c
[2] == 0) {
410 if (tape
->sense_key
== 5) {
411 /* don't report an error, everything's ok */
413 /* don't retry read/write */
414 pc
->flags
|= PC_FLAG_ABORT
;
417 if (pc
->c
[0] == READ_6
&& (sense
[2] & 0x80)) {
418 pc
->error
= IDE_DRV_ERROR_FILEMARK
;
419 pc
->flags
|= PC_FLAG_ABORT
;
421 if (pc
->c
[0] == WRITE_6
) {
422 if ((sense
[2] & 0x40) || (tape
->sense_key
== 0xd
423 && tape
->asc
== 0x0 && tape
->ascq
== 0x2)) {
424 pc
->error
= IDE_DRV_ERROR_EOD
;
425 pc
->flags
|= PC_FLAG_ABORT
;
428 if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
429 if (tape
->sense_key
== 8) {
430 pc
->error
= IDE_DRV_ERROR_EOD
;
431 pc
->flags
|= PC_FLAG_ABORT
;
433 if (!(pc
->flags
& PC_FLAG_ABORT
) &&
435 pc
->retries
= IDETAPE_MAX_PC_RETRIES
+ 1;
439 /* Free data buffers completely. */
440 static void ide_tape_kfree_buffer(idetape_tape_t
*tape
)
442 struct idetape_bh
*prev_bh
, *bh
= tape
->merge_bh
;
445 u32 size
= bh
->b_size
;
448 unsigned int order
= fls(size
>> PAGE_SHIFT
)-1;
451 free_pages((unsigned long)bh
->b_data
, order
);
454 bh
->b_data
+= (1 << order
) * PAGE_SIZE
;
462 static void ide_tape_handle_dsc(ide_drive_t
*);
464 static int ide_tape_callback(ide_drive_t
*drive
, int dsc
)
466 idetape_tape_t
*tape
= drive
->driver_data
;
467 struct ide_atapi_pc
*pc
= drive
->pc
;
468 struct request
*rq
= drive
->hwif
->rq
;
469 int uptodate
= pc
->error
? 0 : 1;
470 int err
= uptodate
? 0 : IDE_DRV_ERROR_GENERAL
;
472 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
475 ide_tape_handle_dsc(drive
);
477 if (drive
->failed_pc
== pc
)
478 drive
->failed_pc
= NULL
;
480 if (pc
->c
[0] == REQUEST_SENSE
) {
482 idetape_analyze_error(drive
, pc
->buf
);
484 printk(KERN_ERR
"ide-tape: Error in REQUEST SENSE "
485 "itself - Aborting request!\n");
486 } else if (pc
->c
[0] == READ_6
|| pc
->c
[0] == WRITE_6
) {
487 int blocks
= pc
->xferred
/ tape
->blk_size
;
489 tape
->avg_size
+= blocks
* tape
->blk_size
;
491 if (time_after_eq(jiffies
, tape
->avg_time
+ HZ
)) {
492 tape
->avg_speed
= tape
->avg_size
* HZ
/
493 (jiffies
- tape
->avg_time
) / 1024;
495 tape
->avg_time
= jiffies
;
498 tape
->first_frame
+= blocks
;
499 rq
->current_nr_sectors
-= blocks
;
505 } else if (pc
->c
[0] == READ_POSITION
&& uptodate
) {
506 u8
*readpos
= pc
->buf
;
508 debug_log(DBG_SENSE
, "BOP - %s\n",
509 (readpos
[0] & 0x80) ? "Yes" : "No");
510 debug_log(DBG_SENSE
, "EOP - %s\n",
511 (readpos
[0] & 0x40) ? "Yes" : "No");
513 if (readpos
[0] & 0x4) {
514 printk(KERN_INFO
"ide-tape: Block location is unknown"
516 clear_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
518 err
= IDE_DRV_ERROR_GENERAL
;
520 debug_log(DBG_SENSE
, "Block Location - %u\n",
521 be32_to_cpup((__be32
*)&readpos
[4]));
523 tape
->partition
= readpos
[1];
524 tape
->first_frame
= be32_to_cpup((__be32
*)&readpos
[4]);
525 set_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
);
535 * Postpone the current request so that ide.c will be able to service requests
536 * from another device on the same port while we are polling for DSC.
538 static void idetape_postpone_request(ide_drive_t
*drive
)
540 idetape_tape_t
*tape
= drive
->driver_data
;
542 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
544 tape
->postponed_rq
= drive
->hwif
->rq
;
546 ide_stall_queue(drive
, tape
->dsc_poll_freq
);
549 static void ide_tape_handle_dsc(ide_drive_t
*drive
)
551 idetape_tape_t
*tape
= drive
->driver_data
;
553 /* Media access command */
554 tape
->dsc_polling_start
= jiffies
;
555 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_FAST
;
556 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_MA_TIMEOUT
;
557 /* Allow ide.c to handle other requests */
558 idetape_postpone_request(drive
);
561 static int ide_tape_io_buffers(ide_drive_t
*drive
, struct ide_atapi_pc
*pc
,
562 unsigned int bcount
, int write
)
567 bleft
= idetape_output_buffers(drive
, pc
, bcount
);
569 bleft
= idetape_input_buffers(drive
, pc
, bcount
);
571 return bcount
- bleft
;
575 * Packet Command Interface
577 * The current Packet Command is available in drive->pc, and will not change
578 * until we finish handling it. Each packet command is associated with a
579 * callback function that will be called when the command is finished.
581 * The handling will be done in three stages:
583 * 1. ide_tape_issue_pc will send the packet command to the drive, and will set
584 * the interrupt handler to ide_pc_intr.
586 * 2. On each interrupt, ide_pc_intr will be called. This step will be
587 * repeated until the device signals us that no more interrupts will be issued.
589 * 3. ATAPI Tape media access commands have immediate status with a delayed
590 * process. In case of a successful initiation of a media access packet command,
591 * the DSC bit will be set when the actual execution of the command is finished.
592 * Since the tape drive will not issue an interrupt, we have to poll for this
593 * event. In this case, we define the request as "low priority request" by
594 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
597 * ide.c will then give higher priority to requests which originate from the
598 * other device, until will change rq_status to RQ_ACTIVE.
600 * 4. When the packet command is finished, it will be checked for errors.
602 * 5. In case an error was found, we queue a request sense packet command in
603 * front of the request queue and retry the operation up to
604 * IDETAPE_MAX_PC_RETRIES times.
606 * 6. In case no error was found, or we decided to give up and not to retry
607 * again, the callback function will be called and then we will handle the next
611 static ide_startstop_t
ide_tape_issue_pc(ide_drive_t
*drive
,
613 struct ide_atapi_pc
*pc
)
615 idetape_tape_t
*tape
= drive
->driver_data
;
617 if (drive
->failed_pc
== NULL
&& pc
->c
[0] != REQUEST_SENSE
)
618 drive
->failed_pc
= pc
;
620 /* Set the current packet command */
623 if (pc
->retries
> IDETAPE_MAX_PC_RETRIES
||
624 (pc
->flags
& PC_FLAG_ABORT
)) {
626 * We will "abort" retrying a packet command in case legitimate
627 * error code was received (crossing a filemark, or end of the
628 * media, for example).
630 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
631 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
632 tape
->sense_key
== 2 && tape
->asc
== 4 &&
633 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
634 printk(KERN_ERR
"ide-tape: %s: I/O error, "
635 "pc = %2x, key = %2x, "
636 "asc = %2x, ascq = %2x\n",
637 tape
->name
, pc
->c
[0],
638 tape
->sense_key
, tape
->asc
,
642 pc
->error
= IDE_DRV_ERROR_GENERAL
;
644 drive
->failed_pc
= NULL
;
645 drive
->pc_callback(drive
, 0);
648 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
652 return ide_issue_pc(drive
, cmd
);
655 /* A mode sense command is used to "sense" tape parameters. */
656 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
659 pc
->c
[0] = MODE_SENSE
;
660 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
661 /* DBD = 1 - Don't return block descriptors */
663 pc
->c
[2] = page_code
;
665 * Changed pc->c[3] to 0 (255 will at best return unused info).
667 * For SCSI this byte is defined as subpage instead of high byte
668 * of length and some IDE drives seem to interpret it this way
669 * and return an error when 255 is used.
672 /* We will just discard data in that case */
674 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
676 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
682 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
684 ide_hwif_t
*hwif
= drive
->hwif
;
685 idetape_tape_t
*tape
= drive
->driver_data
;
686 struct ide_atapi_pc
*pc
= drive
->pc
;
689 stat
= hwif
->tp_ops
->read_status(hwif
);
691 if (stat
& ATA_DSC
) {
692 if (stat
& ATA_ERR
) {
694 if (pc
->c
[0] != TEST_UNIT_READY
)
695 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
697 /* Retry operation */
698 ide_retry_pc(drive
, tape
->disk
);
703 pc
->error
= IDE_DRV_ERROR_GENERAL
;
704 drive
->failed_pc
= NULL
;
706 drive
->pc_callback(drive
, 0);
710 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
711 struct ide_atapi_pc
*pc
, struct request
*rq
,
714 struct idetape_bh
*bh
= (struct idetape_bh
*)rq
->special
;
715 unsigned int length
= rq
->current_nr_sectors
;
718 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
722 pc
->buf_size
= length
* tape
->blk_size
;
723 pc
->req_xfer
= pc
->buf_size
;
724 if (pc
->req_xfer
== tape
->buffer_size
)
725 pc
->flags
|= PC_FLAG_DMA_OK
;
727 if (opcode
== READ_6
) {
729 atomic_set(&bh
->b_count
, 0);
730 } else if (opcode
== WRITE_6
) {
732 pc
->flags
|= PC_FLAG_WRITING
;
733 pc
->b_data
= bh
->b_data
;
734 pc
->b_count
= atomic_read(&bh
->b_count
);
737 memcpy(rq
->cmd
, pc
->c
, 12);
740 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
741 struct request
*rq
, sector_t block
)
743 ide_hwif_t
*hwif
= drive
->hwif
;
744 idetape_tape_t
*tape
= drive
->driver_data
;
745 struct ide_atapi_pc
*pc
= NULL
;
746 struct request
*postponed_rq
= tape
->postponed_rq
;
750 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %lu,"
751 " current_nr_sectors: %u\n",
752 (unsigned long long)rq
->sector
, rq
->nr_sectors
,
753 rq
->current_nr_sectors
);
755 if (!blk_special_request(rq
)) {
756 /* We do not support buffer cache originated requests. */
757 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
758 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
759 if (blk_fs_request(rq
) == 0 && rq
->errors
== 0)
761 ide_complete_rq(drive
, -EIO
, ide_rq_bytes(rq
));
765 /* Retry a failed packet command */
766 if (drive
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
767 pc
= drive
->failed_pc
;
771 if (postponed_rq
!= NULL
)
772 if (rq
!= postponed_rq
) {
773 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
774 "Two DSC requests were queued\n");
775 drive
->failed_pc
= NULL
;
777 ide_complete_rq(drive
, 0, blk_rq_bytes(rq
));
781 tape
->postponed_rq
= NULL
;
784 * If the tape is still busy, postpone our request and service
785 * the other device meanwhile.
787 stat
= hwif
->tp_ops
->read_status(hwif
);
789 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
790 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
791 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
793 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
794 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
795 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
798 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
799 (stat
& ATA_DSC
) == 0) {
800 if (postponed_rq
== NULL
) {
801 tape
->dsc_polling_start
= jiffies
;
802 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
803 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
804 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
805 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
807 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
808 idetape_media_access_finished(drive
);
811 return ide_do_reset(drive
);
813 } else if (time_after(jiffies
,
814 tape
->dsc_polling_start
+
815 IDETAPE_DSC_MA_THRESHOLD
))
816 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
817 idetape_postpone_request(drive
);
820 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
821 pc
= &tape
->queued_pc
;
822 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
825 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
826 pc
= &tape
->queued_pc
;
827 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
830 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
831 pc
= (struct ide_atapi_pc
*) rq
->buffer
;
832 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
833 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
836 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
837 idetape_media_access_finished(drive
);
843 memset(&cmd
, 0, sizeof(cmd
));
846 cmd
.tf_flags
|= IDE_TFLAG_WRITE
;
850 return ide_tape_issue_pc(drive
, &cmd
, pc
);
854 * The function below uses __get_free_pages to allocate a data buffer of size
855 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
858 * It returns a pointer to the newly allocated buffer, or NULL in case of
861 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
864 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
865 int pages
= tape
->pages_per_buffer
;
866 unsigned int order
, b_allocd
;
869 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
874 order
= fls(pages
) - 1;
875 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
878 b_allocd
= (1 << order
) * PAGE_SIZE
;
882 memset(bh
->b_data
, 0, b_allocd
);
883 bh
->b_reqnext
= NULL
;
884 bh
->b_size
= b_allocd
;
885 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
888 order
= fls(pages
) - 1;
889 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
892 b_allocd
= (1 << order
) * PAGE_SIZE
;
895 memset(b_data
, 0, b_allocd
);
897 /* newly allocated page frames below buffer header or ...*/
898 if (bh
->b_data
== b_data
+ b_allocd
) {
899 bh
->b_size
+= b_allocd
;
900 bh
->b_data
-= b_allocd
;
902 atomic_add(b_allocd
, &bh
->b_count
);
905 /* they are above the header */
906 if (b_data
== bh
->b_data
+ bh
->b_size
) {
907 bh
->b_size
+= b_allocd
;
909 atomic_add(b_allocd
, &bh
->b_count
);
913 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
915 free_pages((unsigned long) b_data
, order
);
918 bh
->b_reqnext
= NULL
;
920 bh
->b_size
= b_allocd
;
921 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
922 prev_bh
->b_reqnext
= bh
;
927 bh
->b_size
-= tape
->excess_bh_size
;
929 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
932 ide_tape_kfree_buffer(tape
);
936 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
937 const char __user
*buf
, int n
)
939 struct idetape_bh
*bh
= tape
->bh
;
945 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
949 count
= min((unsigned int)
950 (bh
->b_size
- atomic_read(&bh
->b_count
)),
952 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
956 atomic_add(count
, &bh
->b_count
);
958 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
961 atomic_set(&bh
->b_count
, 0);
968 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
971 struct idetape_bh
*bh
= tape
->bh
;
977 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
981 count
= min(tape
->b_count
, n
);
982 if (copy_to_user(buf
, tape
->b_data
, count
))
985 tape
->b_data
+= count
;
986 tape
->b_count
-= count
;
988 if (!tape
->b_count
) {
992 tape
->b_data
= bh
->b_data
;
993 tape
->b_count
= atomic_read(&bh
->b_count
);
1000 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
1002 struct idetape_bh
*bh
= tape
->merge_bh
;
1003 tape
->bh
= tape
->merge_bh
;
1005 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1006 atomic_set(&bh
->b_count
, 0);
1008 tape
->b_data
= bh
->b_data
;
1009 tape
->b_count
= atomic_read(&bh
->b_count
);
1014 * Write a filemark if write_filemark=1. Flush the device buffers without
1015 * writing a filemark otherwise.
1017 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1018 struct ide_atapi_pc
*pc
, int write_filemark
)
1021 pc
->c
[0] = WRITE_FILEMARKS
;
1022 pc
->c
[4] = write_filemark
;
1023 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1026 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1028 idetape_tape_t
*tape
= drive
->driver_data
;
1029 struct gendisk
*disk
= tape
->disk
;
1030 int load_attempted
= 0;
1032 /* Wait for the tape to become ready */
1033 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1035 while (time_before(jiffies
, timeout
)) {
1036 if (ide_do_test_unit_ready(drive
, disk
) == 0)
1038 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1039 || (tape
->asc
== 0x3A)) {
1043 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1045 /* not about to be ready */
1046 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1047 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1054 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1056 struct ide_tape_obj
*tape
= drive
->driver_data
;
1057 struct ide_atapi_pc pc
;
1060 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1061 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
1064 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1068 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1071 pc
->c
[0] = READ_POSITION
;
1075 static int idetape_read_position(ide_drive_t
*drive
)
1077 idetape_tape_t
*tape
= drive
->driver_data
;
1078 struct ide_atapi_pc pc
;
1081 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1083 idetape_create_read_position_cmd(&pc
);
1084 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
1086 position
= tape
->first_frame
;
1090 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1091 struct ide_atapi_pc
*pc
,
1092 unsigned int block
, u8 partition
, int skip
)
1095 pc
->c
[0] = POSITION_TO_ELEMENT
;
1097 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1098 pc
->c
[8] = partition
;
1099 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1102 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1104 idetape_tape_t
*tape
= drive
->driver_data
;
1106 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1109 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
1110 tape
->merge_bh_size
= 0;
1111 if (tape
->merge_bh
!= NULL
) {
1112 ide_tape_kfree_buffer(tape
);
1113 tape
->merge_bh
= NULL
;
1116 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1120 * Position the tape to the requested block using the LOCATE packet command.
1121 * A READ POSITION command is then issued to check where we are positioned. Like
1122 * all higher level operations, we queue the commands at the tail of the request
1123 * queue and wait for their completion.
1125 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1126 u8 partition
, int skip
)
1128 idetape_tape_t
*tape
= drive
->driver_data
;
1129 struct gendisk
*disk
= tape
->disk
;
1131 struct ide_atapi_pc pc
;
1133 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1134 __ide_tape_discard_merge_buffer(drive
);
1135 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1136 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1137 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1141 idetape_create_read_position_cmd(&pc
);
1142 return ide_queue_pc_tail(drive
, disk
, &pc
);
1145 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1146 int restore_position
)
1148 idetape_tape_t
*tape
= drive
->driver_data
;
1151 __ide_tape_discard_merge_buffer(drive
);
1152 if (restore_position
) {
1153 position
= idetape_read_position(drive
);
1154 seek
= position
> 0 ? position
: 0;
1155 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1156 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1157 " %s\n", tape
->name
, __func__
);
1164 * Generate a read/write request for the block device interface and wait for it
1167 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1168 struct idetape_bh
*bh
)
1170 idetape_tape_t
*tape
= drive
->driver_data
;
1174 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1176 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1177 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1179 rq
->rq_disk
= tape
->disk
;
1180 rq
->special
= (void *)bh
;
1181 rq
->sector
= tape
->first_frame
;
1182 rq
->nr_sectors
= blocks
;
1183 rq
->current_nr_sectors
= blocks
;
1184 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1186 errors
= rq
->errors
;
1187 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1188 blk_put_request(rq
);
1190 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1194 idetape_init_merge_buffer(tape
);
1195 if (errors
== IDE_DRV_ERROR_GENERAL
)
1200 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1208 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1209 struct ide_atapi_pc
*pc
)
1212 pc
->c
[0] = REZERO_UNIT
;
1213 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1216 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1221 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1224 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1228 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1230 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1233 /* Queue up a character device originated write request. */
1234 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1236 idetape_tape_t
*tape
= drive
->driver_data
;
1238 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1240 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1241 blocks
, tape
->merge_bh
);
1244 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1246 idetape_tape_t
*tape
= drive
->driver_data
;
1248 struct idetape_bh
*bh
;
1250 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1251 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1252 " but we are not writing.\n");
1255 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1256 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1257 tape
->merge_bh_size
= tape
->buffer_size
;
1259 if (tape
->merge_bh_size
) {
1260 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1261 if (tape
->merge_bh_size
% tape
->blk_size
) {
1265 i
= tape
->blk_size
- tape
->merge_bh_size
%
1267 bh
= tape
->bh
->b_reqnext
;
1269 atomic_set(&bh
->b_count
, 0);
1275 printk(KERN_INFO
"ide-tape: bug,"
1279 min
= min(i
, (unsigned int)(bh
->b_size
-
1280 atomic_read(&bh
->b_count
)));
1281 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1283 atomic_add(min
, &bh
->b_count
);
1288 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1289 tape
->merge_bh_size
= 0;
1291 if (tape
->merge_bh
!= NULL
) {
1292 ide_tape_kfree_buffer(tape
);
1293 tape
->merge_bh
= NULL
;
1295 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1298 static int idetape_init_read(ide_drive_t
*drive
)
1300 idetape_tape_t
*tape
= drive
->driver_data
;
1303 /* Initialize read operation */
1304 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1305 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1306 ide_tape_flush_merge_buffer(drive
);
1307 idetape_flush_tape_buffers(drive
);
1309 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1310 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1312 tape
->merge_bh_size
= 0;
1314 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1315 if (!tape
->merge_bh
)
1317 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1320 * Issue a read 0 command to ensure that DSC handshake is
1321 * switched from completion mode to buffer available mode.
1322 * No point in issuing this if DSC overlap isn't supported, some
1323 * drives (Seagate STT3401A) will return an error.
1325 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1326 bytes_read
= idetape_queue_rw_tail(drive
,
1327 REQ_IDETAPE_READ
, 0,
1329 if (bytes_read
< 0) {
1330 ide_tape_kfree_buffer(tape
);
1331 tape
->merge_bh
= NULL
;
1332 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1341 /* called from idetape_chrdev_read() to service a chrdev read request. */
1342 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1344 idetape_tape_t
*tape
= drive
->driver_data
;
1346 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1348 /* If we are at a filemark, return a read length of 0 */
1349 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1352 idetape_init_read(drive
);
1354 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1358 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1360 idetape_tape_t
*tape
= drive
->driver_data
;
1361 struct idetape_bh
*bh
;
1367 bh
= tape
->merge_bh
;
1368 count
= min(tape
->buffer_size
, bcount
);
1370 blocks
= count
/ tape
->blk_size
;
1372 atomic_set(&bh
->b_count
,
1373 min(count
, (unsigned int)bh
->b_size
));
1374 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1375 count
-= atomic_read(&bh
->b_count
);
1378 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1384 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1385 * currently support only one partition.
1387 static int idetape_rewind_tape(ide_drive_t
*drive
)
1389 struct ide_tape_obj
*tape
= drive
->driver_data
;
1390 struct gendisk
*disk
= tape
->disk
;
1392 struct ide_atapi_pc pc
;
1394 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1396 idetape_create_rewind_cmd(drive
, &pc
);
1397 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1401 idetape_create_read_position_cmd(&pc
);
1402 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1408 /* mtio.h compatible commands should be issued to the chrdev interface. */
1409 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1412 idetape_tape_t
*tape
= drive
->driver_data
;
1413 void __user
*argp
= (void __user
*)arg
;
1415 struct idetape_config
{
1416 int dsc_rw_frequency
;
1417 int dsc_media_access_frequency
;
1421 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1425 if (copy_from_user(&config
, argp
, sizeof(config
)))
1427 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1430 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1431 config
.nr_stages
= 1;
1432 if (copy_to_user(argp
, &config
, sizeof(config
)))
1441 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1444 idetape_tape_t
*tape
= drive
->driver_data
;
1445 struct gendisk
*disk
= tape
->disk
;
1446 struct ide_atapi_pc pc
;
1447 int retval
, count
= 0;
1448 int sprev
= !!(tape
->caps
[4] & 0x20);
1452 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1455 mt_count
= -mt_count
;
1458 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1459 tape
->merge_bh_size
= 0;
1460 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1462 ide_tape_discard_merge_buffer(drive
, 0);
1468 idetape_create_space_cmd(&pc
, mt_count
- count
,
1469 IDETAPE_SPACE_OVER_FILEMARK
);
1470 return ide_queue_pc_tail(drive
, disk
, &pc
);
1475 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1479 count
= (MTBSFM
== mt_op
? 1 : -1);
1480 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1482 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1489 * Our character device read / write functions.
1491 * The tape is optimized to maximize throughput when it is transferring an
1492 * integral number of the "continuous transfer limit", which is a parameter of
1493 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1495 * As of version 1.3 of the driver, the character device provides an abstract
1496 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1497 * same backup/restore procedure is supported. The driver will internally
1498 * convert the requests to the recommended transfer unit, so that an unmatch
1499 * between the user's block size to the recommended size will only result in a
1500 * (slightly) increased driver overhead, but will no longer hit performance.
1501 * This is not applicable to Onstream.
1503 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1504 size_t count
, loff_t
*ppos
)
1506 struct ide_tape_obj
*tape
= file
->private_data
;
1507 ide_drive_t
*drive
= tape
->drive
;
1508 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
1510 u16 ctl
= *(u16
*)&tape
->caps
[12];
1512 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1514 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1515 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1516 if (count
> tape
->blk_size
&&
1517 (count
% tape
->blk_size
) == 0)
1518 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1520 rc
= idetape_init_read(drive
);
1525 if (tape
->merge_bh_size
) {
1526 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
1527 (unsigned int)count
);
1528 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
1530 buf
+= actually_read
;
1531 tape
->merge_bh_size
-= actually_read
;
1532 count
-= actually_read
;
1534 while (count
>= tape
->buffer_size
) {
1535 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1536 if (bytes_read
<= 0)
1538 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
1541 count
-= bytes_read
;
1542 actually_read
+= bytes_read
;
1545 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1546 if (bytes_read
<= 0)
1548 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
1549 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
1551 actually_read
+= temp
;
1552 tape
->merge_bh_size
= bytes_read
-temp
;
1555 if (!actually_read
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1556 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1558 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1562 return ret
? ret
: actually_read
;
1565 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1566 size_t count
, loff_t
*ppos
)
1568 struct ide_tape_obj
*tape
= file
->private_data
;
1569 ide_drive_t
*drive
= tape
->drive
;
1570 ssize_t actually_written
= 0;
1572 u16 ctl
= *(u16
*)&tape
->caps
[12];
1574 /* The drive is write protected. */
1575 if (tape
->write_prot
)
1578 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1580 /* Initialize write operation */
1581 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1582 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1583 ide_tape_discard_merge_buffer(drive
, 1);
1584 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1585 printk(KERN_ERR
"ide-tape: merge_bh_size "
1586 "should be 0 now\n");
1587 tape
->merge_bh_size
= 0;
1589 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1590 if (!tape
->merge_bh
)
1592 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
1593 idetape_init_merge_buffer(tape
);
1596 * Issue a write 0 command to ensure that DSC handshake is
1597 * switched from completion mode to buffer available mode. No
1598 * point in issuing this if DSC overlap isn't supported, some
1599 * drives (Seagate STT3401A) will return an error.
1601 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1602 ssize_t retval
= idetape_queue_rw_tail(drive
,
1603 REQ_IDETAPE_WRITE
, 0,
1606 ide_tape_kfree_buffer(tape
);
1607 tape
->merge_bh
= NULL
;
1608 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1615 if (tape
->merge_bh_size
) {
1616 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
1617 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
1618 tape
->merge_bh_size
= 0;
1620 actually_written
= min((unsigned int)
1621 (tape
->buffer_size
- tape
->merge_bh_size
),
1622 (unsigned int)count
);
1623 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
1625 buf
+= actually_written
;
1626 tape
->merge_bh_size
+= actually_written
;
1627 count
-= actually_written
;
1629 if (tape
->merge_bh_size
== tape
->buffer_size
) {
1631 tape
->merge_bh_size
= 0;
1632 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1637 while (count
>= tape
->buffer_size
) {
1639 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
1641 buf
+= tape
->buffer_size
;
1642 count
-= tape
->buffer_size
;
1643 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1644 actually_written
+= tape
->buffer_size
;
1649 actually_written
+= count
;
1650 if (idetape_copy_stage_from_user(tape
, buf
, count
))
1652 tape
->merge_bh_size
+= count
;
1654 return ret
? ret
: actually_written
;
1657 static int idetape_write_filemark(ide_drive_t
*drive
)
1659 struct ide_tape_obj
*tape
= drive
->driver_data
;
1660 struct ide_atapi_pc pc
;
1662 /* Write a filemark */
1663 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1664 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1665 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1672 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1675 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1676 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1677 * usually not supported.
1679 * The following commands are currently not supported:
1681 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1682 * MT_ST_WRITE_THRESHOLD.
1684 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1686 idetape_tape_t
*tape
= drive
->driver_data
;
1687 struct gendisk
*disk
= tape
->disk
;
1688 struct ide_atapi_pc pc
;
1691 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1701 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1708 if (tape
->write_prot
)
1710 ide_tape_discard_merge_buffer(drive
, 1);
1711 for (i
= 0; i
< mt_count
; i
++) {
1712 retval
= idetape_write_filemark(drive
);
1718 ide_tape_discard_merge_buffer(drive
, 0);
1719 if (idetape_rewind_tape(drive
))
1723 ide_tape_discard_merge_buffer(drive
, 0);
1724 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1728 * If door is locked, attempt to unlock before
1729 * attempting to eject.
1731 if (tape
->door_locked
) {
1732 if (!ide_set_media_lock(drive
, disk
, 0))
1733 tape
->door_locked
= DOOR_UNLOCKED
;
1735 ide_tape_discard_merge_buffer(drive
, 0);
1736 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1738 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1741 ide_tape_discard_merge_buffer(drive
, 0);
1742 return idetape_flush_tape_buffers(drive
);
1744 ide_tape_discard_merge_buffer(drive
, 0);
1745 return ide_do_start_stop(drive
, disk
,
1746 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1748 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1749 return ide_queue_pc_tail(drive
, disk
, &pc
);
1751 (void)idetape_rewind_tape(drive
);
1752 idetape_create_erase_cmd(&pc
);
1753 return ide_queue_pc_tail(drive
, disk
, &pc
);
1756 if (mt_count
< tape
->blk_size
||
1757 mt_count
% tape
->blk_size
)
1759 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1760 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1762 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1765 ide_tape_discard_merge_buffer(drive
, 0);
1766 return idetape_position_tape(drive
,
1767 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1769 ide_tape_discard_merge_buffer(drive
, 0);
1770 return idetape_position_tape(drive
, 0, mt_count
, 0);
1774 retval
= ide_set_media_lock(drive
, disk
, 1);
1777 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1780 retval
= ide_set_media_lock(drive
, disk
, 0);
1783 tape
->door_locked
= DOOR_UNLOCKED
;
1786 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1793 * Our character device ioctls. General mtio.h magnetic io commands are
1794 * supported here, and not in the corresponding block interface. Our own
1795 * ide-tape ioctls are supported on both interfaces.
1797 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1798 unsigned int cmd
, unsigned long arg
)
1800 struct ide_tape_obj
*tape
= file
->private_data
;
1801 ide_drive_t
*drive
= tape
->drive
;
1805 int block_offset
= 0, position
= tape
->first_frame
;
1806 void __user
*argp
= (void __user
*)arg
;
1808 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1810 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1811 ide_tape_flush_merge_buffer(drive
);
1812 idetape_flush_tape_buffers(drive
);
1814 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1815 block_offset
= tape
->merge_bh_size
/
1816 (tape
->blk_size
* tape
->user_bs_factor
);
1817 position
= idetape_read_position(drive
);
1823 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1825 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1827 memset(&mtget
, 0, sizeof(struct mtget
));
1828 mtget
.mt_type
= MT_ISSCSI2
;
1829 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1831 ((tape
->blk_size
* tape
->user_bs_factor
)
1832 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1834 if (tape
->drv_write_prot
)
1835 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1837 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1841 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1842 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1846 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1847 ide_tape_discard_merge_buffer(drive
, 1);
1848 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1853 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1854 * block size with the reported value.
1856 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1858 idetape_tape_t
*tape
= drive
->driver_data
;
1859 struct ide_atapi_pc pc
;
1861 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1862 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1863 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1864 if (tape
->blk_size
== 0) {
1865 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1866 "block size, assuming 32k\n");
1867 tape
->blk_size
= 32768;
1871 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1872 (pc
.buf
[4 + 6] << 8) +
1874 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1877 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1879 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1881 idetape_tape_t
*tape
;
1884 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1888 tape
= ide_tape_chrdev_get(i
);
1894 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1897 * We really want to do nonseekable_open(inode, filp); here, but some
1898 * versions of tar incorrectly call lseek on tapes and bail out if that
1899 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1901 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1903 drive
= tape
->drive
;
1905 filp
->private_data
= tape
;
1907 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1912 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1914 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1915 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1919 idetape_read_position(drive
);
1920 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1921 (void)idetape_rewind_tape(drive
);
1923 /* Read block size and write protect status from drive. */
1924 ide_tape_get_bsize_from_bdesc(drive
);
1926 /* Set write protect flag if device is opened as read-only. */
1927 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1928 tape
->write_prot
= 1;
1930 tape
->write_prot
= tape
->drv_write_prot
;
1932 /* Make sure drive isn't write protected if user wants to write. */
1933 if (tape
->write_prot
) {
1934 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1935 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1936 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1942 /* Lock the tape drive door so user can't eject. */
1943 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1944 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1945 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1946 tape
->door_locked
= DOOR_LOCKED
;
1958 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1960 idetape_tape_t
*tape
= drive
->driver_data
;
1962 ide_tape_flush_merge_buffer(drive
);
1963 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
1964 if (tape
->merge_bh
!= NULL
) {
1965 idetape_pad_zeros(drive
, tape
->blk_size
*
1966 (tape
->user_bs_factor
- 1));
1967 ide_tape_kfree_buffer(tape
);
1968 tape
->merge_bh
= NULL
;
1970 idetape_write_filemark(drive
);
1971 idetape_flush_tape_buffers(drive
);
1972 idetape_flush_tape_buffers(drive
);
1975 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
1977 struct ide_tape_obj
*tape
= filp
->private_data
;
1978 ide_drive_t
*drive
= tape
->drive
;
1979 unsigned int minor
= iminor(inode
);
1982 tape
= drive
->driver_data
;
1984 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1986 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1987 idetape_write_release(drive
, minor
);
1988 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1990 ide_tape_discard_merge_buffer(drive
, 1);
1993 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
1994 (void) idetape_rewind_tape(drive
);
1995 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1996 if (tape
->door_locked
== DOOR_LOCKED
) {
1997 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
1998 tape
->door_locked
= DOOR_UNLOCKED
;
2001 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
2007 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2009 idetape_tape_t
*tape
= drive
->driver_data
;
2010 struct ide_atapi_pc pc
;
2012 char fw_rev
[4], vendor_id
[8], product_id
[16];
2014 idetape_create_inquiry_cmd(&pc
);
2015 pc
.buf
= &pc_buf
[0];
2016 pc
.buf_size
= sizeof(pc_buf
);
2018 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2019 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2023 memcpy(vendor_id
, &pc
.buf
[8], 8);
2024 memcpy(product_id
, &pc
.buf
[16], 16);
2025 memcpy(fw_rev
, &pc
.buf
[32], 4);
2027 ide_fixstring(vendor_id
, 8, 0);
2028 ide_fixstring(product_id
, 16, 0);
2029 ide_fixstring(fw_rev
, 4, 0);
2031 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2032 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2036 * Ask the tape about its various parameters. In particular, we will adjust our
2037 * data transfer buffer size to the recommended value as returned by the tape.
2039 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2041 idetape_tape_t
*tape
= drive
->driver_data
;
2042 struct ide_atapi_pc pc
;
2044 u8 speed
, max_speed
;
2046 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2047 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2048 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2049 " some default values\n");
2050 tape
->blk_size
= 512;
2051 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2052 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2053 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2056 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2058 /* convert to host order and save for later use */
2059 speed
= be16_to_cpup((__be16
*)&caps
[14]);
2060 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
2062 *(u16
*)&caps
[8] = max_speed
;
2063 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
2064 *(u16
*)&caps
[14] = speed
;
2065 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
2068 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2069 "(assuming 650KB/sec)\n", drive
->name
);
2070 *(u16
*)&caps
[14] = 650;
2073 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2074 "(assuming 650KB/sec)\n", drive
->name
);
2075 *(u16
*)&caps
[8] = 650;
2078 memcpy(&tape
->caps
, caps
, 20);
2080 /* device lacks locking support according to capabilities page */
2081 if ((caps
[6] & 1) == 0)
2082 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
2085 tape
->blk_size
= 512;
2086 else if (caps
[7] & 0x04)
2087 tape
->blk_size
= 1024;
2090 #ifdef CONFIG_IDE_PROC_FS
2091 #define ide_tape_devset_get(name, field) \
2092 static int get_##name(ide_drive_t *drive) \
2094 idetape_tape_t *tape = drive->driver_data; \
2095 return tape->field; \
2098 #define ide_tape_devset_set(name, field) \
2099 static int set_##name(ide_drive_t *drive, int arg) \
2101 idetape_tape_t *tape = drive->driver_data; \
2102 tape->field = arg; \
2106 #define ide_tape_devset_rw_field(_name, _field) \
2107 ide_tape_devset_get(_name, _field) \
2108 ide_tape_devset_set(_name, _field) \
2109 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2111 #define ide_tape_devset_r_field(_name, _field) \
2112 ide_tape_devset_get(_name, _field) \
2113 IDE_DEVSET(_name, 0, get_##_name, NULL)
2115 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
2116 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
2117 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
2118 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
2120 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
2122 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
2123 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
2125 ide_tape_devset_r_field(avg_speed
, avg_speed
);
2126 ide_tape_devset_r_field(speed
, caps
[14]);
2127 ide_tape_devset_r_field(buffer
, caps
[16]);
2128 ide_tape_devset_r_field(buffer_size
, buffer_size
);
2130 static const struct ide_proc_devset idetape_settings
[] = {
2131 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
2132 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
2133 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
2134 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
2135 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
2136 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
2137 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
2138 mulf_tdsc
, divf_tdsc
),
2144 * The function below is called to:
2146 * 1. Initialize our various state variables.
2147 * 2. Ask the tape for its capabilities.
2148 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2149 * is chosen based on the recommendation which we received in step 2.
2151 * Note that at this point ide.c already assigned us an irq, so that we can
2152 * queue requests here and wait for their completion.
2154 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2159 u16
*ctl
= (u16
*)&tape
->caps
[12];
2161 drive
->pc_callback
= ide_tape_callback
;
2162 drive
->pc_update_buffers
= idetape_update_buffers
;
2163 drive
->pc_io_buffers
= ide_tape_io_buffers
;
2165 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
2167 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2168 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2170 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2173 /* Seagate Travan drives do not support DSC overlap. */
2174 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
2175 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2177 tape
->minor
= minor
;
2178 tape
->name
[0] = 'h';
2179 tape
->name
[1] = 't';
2180 tape
->name
[2] = '0' + minor
;
2181 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2183 idetape_get_inquiry_results(drive
);
2184 idetape_get_mode_sense_results(drive
);
2185 ide_tape_get_bsize_from_bdesc(drive
);
2186 tape
->user_bs_factor
= 1;
2187 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2188 while (tape
->buffer_size
> 0xffff) {
2189 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2191 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2193 buffer_size
= tape
->buffer_size
;
2194 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2195 if (buffer_size
% PAGE_SIZE
) {
2196 tape
->pages_per_buffer
++;
2197 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2200 /* select the "best" DSC read/write polling freq */
2201 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2203 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2206 * Ensure that the number we got makes sense; limit it within
2207 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2209 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2210 IDETAPE_DSC_RW_MAX
);
2211 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2213 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2214 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2215 tape
->buffer_size
/ 1024,
2216 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2217 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
2219 ide_proc_register_driver(drive
, tape
->driver
);
2222 static void ide_tape_remove(ide_drive_t
*drive
)
2224 idetape_tape_t
*tape
= drive
->driver_data
;
2226 ide_proc_unregister_driver(drive
, tape
->driver
);
2227 device_del(&tape
->dev
);
2228 ide_unregister_region(tape
->disk
);
2230 mutex_lock(&idetape_ref_mutex
);
2231 put_device(&tape
->dev
);
2232 mutex_unlock(&idetape_ref_mutex
);
2235 static void ide_tape_release(struct device
*dev
)
2237 struct ide_tape_obj
*tape
= to_ide_drv(dev
, ide_tape_obj
);
2238 ide_drive_t
*drive
= tape
->drive
;
2239 struct gendisk
*g
= tape
->disk
;
2241 BUG_ON(tape
->merge_bh_size
);
2243 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2244 drive
->driver_data
= NULL
;
2245 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2246 device_destroy(idetape_sysfs_class
,
2247 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2248 idetape_devs
[tape
->minor
] = NULL
;
2249 g
->private_data
= NULL
;
2254 #ifdef CONFIG_IDE_PROC_FS
2255 static int proc_idetape_read_name
2256 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2258 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2259 idetape_tape_t
*tape
= drive
->driver_data
;
2263 len
= sprintf(out
, "%s\n", tape
->name
);
2264 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2267 static ide_proc_entry_t idetape_proc
[] = {
2268 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2269 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2270 { NULL
, 0, NULL
, NULL
}
2273 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
2275 return idetape_proc
;
2278 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
2280 return idetape_settings
;
2284 static int ide_tape_probe(ide_drive_t
*);
2286 static struct ide_driver idetape_driver
= {
2288 .owner
= THIS_MODULE
,
2290 .bus
= &ide_bus_type
,
2292 .probe
= ide_tape_probe
,
2293 .remove
= ide_tape_remove
,
2294 .version
= IDETAPE_VERSION
,
2295 .do_request
= idetape_do_request
,
2296 #ifdef CONFIG_IDE_PROC_FS
2297 .proc_entries
= ide_tape_proc_entries
,
2298 .proc_devsets
= ide_tape_proc_devsets
,
2302 /* Our character device supporting functions, passed to register_chrdev. */
2303 static const struct file_operations idetape_fops
= {
2304 .owner
= THIS_MODULE
,
2305 .read
= idetape_chrdev_read
,
2306 .write
= idetape_chrdev_write
,
2307 .ioctl
= idetape_chrdev_ioctl
,
2308 .open
= idetape_chrdev_open
,
2309 .release
= idetape_chrdev_release
,
2312 static int idetape_open(struct block_device
*bdev
, fmode_t mode
)
2314 struct ide_tape_obj
*tape
= ide_tape_get(bdev
->bd_disk
);
2322 static int idetape_release(struct gendisk
*disk
, fmode_t mode
)
2324 struct ide_tape_obj
*tape
= ide_drv_g(disk
, ide_tape_obj
);
2330 static int idetape_ioctl(struct block_device
*bdev
, fmode_t mode
,
2331 unsigned int cmd
, unsigned long arg
)
2333 struct ide_tape_obj
*tape
= ide_drv_g(bdev
->bd_disk
, ide_tape_obj
);
2334 ide_drive_t
*drive
= tape
->drive
;
2335 int err
= generic_ide_ioctl(drive
, bdev
, cmd
, arg
);
2337 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2341 static struct block_device_operations idetape_block_ops
= {
2342 .owner
= THIS_MODULE
,
2343 .open
= idetape_open
,
2344 .release
= idetape_release
,
2345 .locked_ioctl
= idetape_ioctl
,
2348 static int ide_tape_probe(ide_drive_t
*drive
)
2350 idetape_tape_t
*tape
;
2354 if (!strstr("ide-tape", drive
->driver_req
))
2357 if (drive
->media
!= ide_tape
)
2360 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) &&
2361 ide_check_atapi_device(drive
, DRV_NAME
) == 0) {
2362 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2363 " the driver\n", drive
->name
);
2366 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2368 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2373 g
= alloc_disk(1 << PARTN_BITS
);
2377 ide_init_disk(g
, drive
);
2379 tape
->dev
.parent
= &drive
->gendev
;
2380 tape
->dev
.release
= ide_tape_release
;
2381 dev_set_name(&tape
->dev
, dev_name(&drive
->gendev
));
2383 if (device_register(&tape
->dev
))
2386 tape
->drive
= drive
;
2387 tape
->driver
= &idetape_driver
;
2390 g
->private_data
= &tape
->driver
;
2392 drive
->driver_data
= tape
;
2394 mutex_lock(&idetape_ref_mutex
);
2395 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2397 idetape_devs
[minor
] = tape
;
2398 mutex_unlock(&idetape_ref_mutex
);
2400 idetape_setup(drive
, tape
, minor
);
2402 device_create(idetape_sysfs_class
, &drive
->gendev
,
2403 MKDEV(IDETAPE_MAJOR
, minor
), NULL
, "%s", tape
->name
);
2404 device_create(idetape_sysfs_class
, &drive
->gendev
,
2405 MKDEV(IDETAPE_MAJOR
, minor
+ 128), NULL
,
2408 g
->fops
= &idetape_block_ops
;
2409 ide_register_region(g
);
2421 static void __exit
idetape_exit(void)
2423 driver_unregister(&idetape_driver
.gen_driver
);
2424 class_destroy(idetape_sysfs_class
);
2425 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2428 static int __init
idetape_init(void)
2431 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2432 if (IS_ERR(idetape_sysfs_class
)) {
2433 idetape_sysfs_class
= NULL
;
2434 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2439 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2440 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2443 goto out_free_class
;
2446 error
= driver_register(&idetape_driver
.gen_driver
);
2448 goto out_free_driver
;
2453 driver_unregister(&idetape_driver
.gen_driver
);
2455 class_destroy(idetape_sysfs_class
);
2460 MODULE_ALIAS("ide:*m-tape*");
2461 module_init(idetape_init
);
2462 module_exit(idetape_exit
);
2463 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
2464 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2465 MODULE_LICENSE("GPL");