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
)) {
625 unsigned int done
= blk_rq_bytes(drive
->hwif
->rq
);
628 * We will "abort" retrying a packet command in case legitimate
629 * error code was received (crossing a filemark, or end of the
630 * media, for example).
632 if (!(pc
->flags
& PC_FLAG_ABORT
)) {
633 if (!(pc
->c
[0] == TEST_UNIT_READY
&&
634 tape
->sense_key
== 2 && tape
->asc
== 4 &&
635 (tape
->ascq
== 1 || tape
->ascq
== 8))) {
636 printk(KERN_ERR
"ide-tape: %s: I/O error, "
637 "pc = %2x, key = %2x, "
638 "asc = %2x, ascq = %2x\n",
639 tape
->name
, pc
->c
[0],
640 tape
->sense_key
, tape
->asc
,
644 pc
->error
= IDE_DRV_ERROR_GENERAL
;
647 drive
->failed_pc
= NULL
;
648 drive
->pc_callback(drive
, 0);
649 ide_complete_rq(drive
, -EIO
, done
);
652 debug_log(DBG_SENSE
, "Retry #%d, cmd = %02X\n", pc
->retries
, pc
->c
[0]);
656 return ide_issue_pc(drive
, cmd
);
659 /* A mode sense command is used to "sense" tape parameters. */
660 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc
*pc
, u8 page_code
)
663 pc
->c
[0] = MODE_SENSE
;
664 if (page_code
!= IDETAPE_BLOCK_DESCRIPTOR
)
665 /* DBD = 1 - Don't return block descriptors */
667 pc
->c
[2] = page_code
;
669 * Changed pc->c[3] to 0 (255 will at best return unused info).
671 * For SCSI this byte is defined as subpage instead of high byte
672 * of length and some IDE drives seem to interpret it this way
673 * and return an error when 255 is used.
676 /* We will just discard data in that case */
678 if (page_code
== IDETAPE_BLOCK_DESCRIPTOR
)
680 else if (page_code
== IDETAPE_CAPABILITIES_PAGE
)
686 static ide_startstop_t
idetape_media_access_finished(ide_drive_t
*drive
)
688 ide_hwif_t
*hwif
= drive
->hwif
;
689 idetape_tape_t
*tape
= drive
->driver_data
;
690 struct ide_atapi_pc
*pc
= drive
->pc
;
693 stat
= hwif
->tp_ops
->read_status(hwif
);
695 if (stat
& ATA_DSC
) {
696 if (stat
& ATA_ERR
) {
698 if (pc
->c
[0] != TEST_UNIT_READY
)
699 printk(KERN_ERR
"ide-tape: %s: I/O error, ",
701 /* Retry operation */
707 pc
->error
= IDE_DRV_ERROR_GENERAL
;
708 drive
->failed_pc
= NULL
;
710 drive
->pc_callback(drive
, 0);
714 static void ide_tape_create_rw_cmd(idetape_tape_t
*tape
,
715 struct ide_atapi_pc
*pc
, struct request
*rq
,
718 struct idetape_bh
*bh
= (struct idetape_bh
*)rq
->special
;
719 unsigned int length
= rq
->current_nr_sectors
;
722 put_unaligned(cpu_to_be32(length
), (unsigned int *) &pc
->c
[1]);
726 pc
->buf_size
= length
* tape
->blk_size
;
727 pc
->req_xfer
= pc
->buf_size
;
728 if (pc
->req_xfer
== tape
->buffer_size
)
729 pc
->flags
|= PC_FLAG_DMA_OK
;
731 if (opcode
== READ_6
) {
733 atomic_set(&bh
->b_count
, 0);
734 } else if (opcode
== WRITE_6
) {
736 pc
->flags
|= PC_FLAG_WRITING
;
737 pc
->b_data
= bh
->b_data
;
738 pc
->b_count
= atomic_read(&bh
->b_count
);
741 memcpy(rq
->cmd
, pc
->c
, 12);
744 static ide_startstop_t
idetape_do_request(ide_drive_t
*drive
,
745 struct request
*rq
, sector_t block
)
747 ide_hwif_t
*hwif
= drive
->hwif
;
748 idetape_tape_t
*tape
= drive
->driver_data
;
749 struct ide_atapi_pc
*pc
= NULL
;
750 struct request
*postponed_rq
= tape
->postponed_rq
;
754 debug_log(DBG_SENSE
, "sector: %llu, nr_sectors: %lu,"
755 " current_nr_sectors: %u\n",
756 (unsigned long long)rq
->sector
, rq
->nr_sectors
,
757 rq
->current_nr_sectors
);
759 if (!(blk_special_request(rq
) || blk_sense_request(rq
))) {
760 /* We do not support buffer cache originated requests. */
761 printk(KERN_NOTICE
"ide-tape: %s: Unsupported request in "
762 "request queue (%d)\n", drive
->name
, rq
->cmd_type
);
763 if (blk_fs_request(rq
) == 0 && rq
->errors
== 0)
765 ide_complete_rq(drive
, -EIO
, ide_rq_bytes(rq
));
769 /* Retry a failed packet command */
770 if (drive
->failed_pc
&& drive
->pc
->c
[0] == REQUEST_SENSE
) {
771 pc
= drive
->failed_pc
;
775 if (postponed_rq
!= NULL
)
776 if (rq
!= postponed_rq
) {
777 printk(KERN_ERR
"ide-tape: ide-tape.c bug - "
778 "Two DSC requests were queued\n");
779 drive
->failed_pc
= NULL
;
781 ide_complete_rq(drive
, 0, blk_rq_bytes(rq
));
785 tape
->postponed_rq
= NULL
;
788 * If the tape is still busy, postpone our request and service
789 * the other device meanwhile.
791 stat
= hwif
->tp_ops
->read_status(hwif
);
793 if ((drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) == 0 &&
794 (rq
->cmd
[13] & REQ_IDETAPE_PC2
) == 0)
795 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
797 if (drive
->dev_flags
& IDE_DFLAG_POST_RESET
) {
798 set_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
);
799 drive
->dev_flags
&= ~IDE_DFLAG_POST_RESET
;
802 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC
, &drive
->atapi_flags
) &&
803 (stat
& ATA_DSC
) == 0) {
804 if (postponed_rq
== NULL
) {
805 tape
->dsc_polling_start
= jiffies
;
806 tape
->dsc_poll_freq
= tape
->best_dsc_rw_freq
;
807 tape
->dsc_timeout
= jiffies
+ IDETAPE_DSC_RW_TIMEOUT
;
808 } else if (time_after(jiffies
, tape
->dsc_timeout
)) {
809 printk(KERN_ERR
"ide-tape: %s: DSC timeout\n",
811 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
812 idetape_media_access_finished(drive
);
815 return ide_do_reset(drive
);
817 } else if (time_after(jiffies
,
818 tape
->dsc_polling_start
+
819 IDETAPE_DSC_MA_THRESHOLD
))
820 tape
->dsc_poll_freq
= IDETAPE_DSC_MA_SLOW
;
821 idetape_postpone_request(drive
);
824 if (rq
->cmd
[13] & REQ_IDETAPE_READ
) {
825 pc
= &tape
->queued_pc
;
826 ide_tape_create_rw_cmd(tape
, pc
, rq
, READ_6
);
829 if (rq
->cmd
[13] & REQ_IDETAPE_WRITE
) {
830 pc
= &tape
->queued_pc
;
831 ide_tape_create_rw_cmd(tape
, pc
, rq
, WRITE_6
);
834 if (rq
->cmd
[13] & REQ_IDETAPE_PC1
) {
835 pc
= (struct ide_atapi_pc
*)rq
->special
;
836 rq
->cmd
[13] &= ~(REQ_IDETAPE_PC1
);
837 rq
->cmd
[13] |= REQ_IDETAPE_PC2
;
840 if (rq
->cmd
[13] & REQ_IDETAPE_PC2
) {
841 idetape_media_access_finished(drive
);
847 /* prepare sense request for this command */
848 ide_prep_sense(drive
, rq
);
850 memset(&cmd
, 0, sizeof(cmd
));
853 cmd
.tf_flags
|= IDE_TFLAG_WRITE
;
857 ide_init_sg_cmd(&cmd
, pc
->req_xfer
);
858 ide_map_sg(drive
, &cmd
);
860 return ide_tape_issue_pc(drive
, &cmd
, pc
);
864 * The function below uses __get_free_pages to allocate a data buffer of size
865 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
868 * It returns a pointer to the newly allocated buffer, or NULL in case of
871 static struct idetape_bh
*ide_tape_kmalloc_buffer(idetape_tape_t
*tape
,
874 struct idetape_bh
*prev_bh
, *bh
, *merge_bh
;
875 int pages
= tape
->pages_per_buffer
;
876 unsigned int order
, b_allocd
;
879 merge_bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
884 order
= fls(pages
) - 1;
885 bh
->b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
888 b_allocd
= (1 << order
) * PAGE_SIZE
;
892 memset(bh
->b_data
, 0, b_allocd
);
893 bh
->b_reqnext
= NULL
;
894 bh
->b_size
= b_allocd
;
895 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
898 order
= fls(pages
) - 1;
899 b_data
= (char *) __get_free_pages(GFP_KERNEL
, order
);
902 b_allocd
= (1 << order
) * PAGE_SIZE
;
905 memset(b_data
, 0, b_allocd
);
907 /* newly allocated page frames below buffer header or ...*/
908 if (bh
->b_data
== b_data
+ b_allocd
) {
909 bh
->b_size
+= b_allocd
;
910 bh
->b_data
-= b_allocd
;
912 atomic_add(b_allocd
, &bh
->b_count
);
915 /* they are above the header */
916 if (b_data
== bh
->b_data
+ bh
->b_size
) {
917 bh
->b_size
+= b_allocd
;
919 atomic_add(b_allocd
, &bh
->b_count
);
923 bh
= kmalloc(sizeof(struct idetape_bh
), GFP_KERNEL
);
925 free_pages((unsigned long) b_data
, order
);
928 bh
->b_reqnext
= NULL
;
930 bh
->b_size
= b_allocd
;
931 atomic_set(&bh
->b_count
, full
? bh
->b_size
: 0);
932 prev_bh
->b_reqnext
= bh
;
937 bh
->b_size
-= tape
->excess_bh_size
;
939 atomic_sub(tape
->excess_bh_size
, &bh
->b_count
);
942 ide_tape_kfree_buffer(tape
);
946 static int idetape_copy_stage_from_user(idetape_tape_t
*tape
,
947 const char __user
*buf
, int n
)
949 struct idetape_bh
*bh
= tape
->bh
;
955 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
959 count
= min((unsigned int)
960 (bh
->b_size
- atomic_read(&bh
->b_count
)),
962 if (copy_from_user(bh
->b_data
+ atomic_read(&bh
->b_count
), buf
,
966 atomic_add(count
, &bh
->b_count
);
968 if (atomic_read(&bh
->b_count
) == bh
->b_size
) {
971 atomic_set(&bh
->b_count
, 0);
978 static int idetape_copy_stage_to_user(idetape_tape_t
*tape
, char __user
*buf
,
981 struct idetape_bh
*bh
= tape
->bh
;
987 printk(KERN_ERR
"ide-tape: bh == NULL in %s\n",
991 count
= min(tape
->b_count
, n
);
992 if (copy_to_user(buf
, tape
->b_data
, count
))
995 tape
->b_data
+= count
;
996 tape
->b_count
-= count
;
998 if (!tape
->b_count
) {
1002 tape
->b_data
= bh
->b_data
;
1003 tape
->b_count
= atomic_read(&bh
->b_count
);
1010 static void idetape_init_merge_buffer(idetape_tape_t
*tape
)
1012 struct idetape_bh
*bh
= tape
->merge_bh
;
1013 tape
->bh
= tape
->merge_bh
;
1015 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1016 atomic_set(&bh
->b_count
, 0);
1018 tape
->b_data
= bh
->b_data
;
1019 tape
->b_count
= atomic_read(&bh
->b_count
);
1024 * Write a filemark if write_filemark=1. Flush the device buffers without
1025 * writing a filemark otherwise.
1027 static void idetape_create_write_filemark_cmd(ide_drive_t
*drive
,
1028 struct ide_atapi_pc
*pc
, int write_filemark
)
1031 pc
->c
[0] = WRITE_FILEMARKS
;
1032 pc
->c
[4] = write_filemark
;
1033 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1036 static int idetape_wait_ready(ide_drive_t
*drive
, unsigned long timeout
)
1038 idetape_tape_t
*tape
= drive
->driver_data
;
1039 struct gendisk
*disk
= tape
->disk
;
1040 int load_attempted
= 0;
1042 /* Wait for the tape to become ready */
1043 set_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1045 while (time_before(jiffies
, timeout
)) {
1046 if (ide_do_test_unit_ready(drive
, disk
) == 0)
1048 if ((tape
->sense_key
== 2 && tape
->asc
== 4 && tape
->ascq
== 2)
1049 || (tape
->asc
== 0x3A)) {
1053 ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1055 /* not about to be ready */
1056 } else if (!(tape
->sense_key
== 2 && tape
->asc
== 4 &&
1057 (tape
->ascq
== 1 || tape
->ascq
== 8)))
1064 static int idetape_flush_tape_buffers(ide_drive_t
*drive
)
1066 struct ide_tape_obj
*tape
= drive
->driver_data
;
1067 struct ide_atapi_pc pc
;
1070 idetape_create_write_filemark_cmd(drive
, &pc
, 0);
1071 rc
= ide_queue_pc_tail(drive
, tape
->disk
, &pc
);
1074 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1078 static void idetape_create_read_position_cmd(struct ide_atapi_pc
*pc
)
1081 pc
->c
[0] = READ_POSITION
;
1085 static int idetape_read_position(ide_drive_t
*drive
)
1087 idetape_tape_t
*tape
= drive
->driver_data
;
1088 struct ide_atapi_pc pc
;
1091 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1093 idetape_create_read_position_cmd(&pc
);
1094 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
))
1096 position
= tape
->first_frame
;
1100 static void idetape_create_locate_cmd(ide_drive_t
*drive
,
1101 struct ide_atapi_pc
*pc
,
1102 unsigned int block
, u8 partition
, int skip
)
1105 pc
->c
[0] = POSITION_TO_ELEMENT
;
1107 put_unaligned(cpu_to_be32(block
), (unsigned int *) &pc
->c
[3]);
1108 pc
->c
[8] = partition
;
1109 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1112 static void __ide_tape_discard_merge_buffer(ide_drive_t
*drive
)
1114 idetape_tape_t
*tape
= drive
->driver_data
;
1116 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
)
1119 clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
);
1120 tape
->merge_bh_size
= 0;
1121 if (tape
->merge_bh
!= NULL
) {
1122 ide_tape_kfree_buffer(tape
);
1123 tape
->merge_bh
= NULL
;
1126 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1130 * Position the tape to the requested block using the LOCATE packet command.
1131 * A READ POSITION command is then issued to check where we are positioned. Like
1132 * all higher level operations, we queue the commands at the tail of the request
1133 * queue and wait for their completion.
1135 static int idetape_position_tape(ide_drive_t
*drive
, unsigned int block
,
1136 u8 partition
, int skip
)
1138 idetape_tape_t
*tape
= drive
->driver_data
;
1139 struct gendisk
*disk
= tape
->disk
;
1141 struct ide_atapi_pc pc
;
1143 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1144 __ide_tape_discard_merge_buffer(drive
);
1145 idetape_wait_ready(drive
, 60 * 5 * HZ
);
1146 idetape_create_locate_cmd(drive
, &pc
, block
, partition
, skip
);
1147 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1151 idetape_create_read_position_cmd(&pc
);
1152 return ide_queue_pc_tail(drive
, disk
, &pc
);
1155 static void ide_tape_discard_merge_buffer(ide_drive_t
*drive
,
1156 int restore_position
)
1158 idetape_tape_t
*tape
= drive
->driver_data
;
1161 __ide_tape_discard_merge_buffer(drive
);
1162 if (restore_position
) {
1163 position
= idetape_read_position(drive
);
1164 seek
= position
> 0 ? position
: 0;
1165 if (idetape_position_tape(drive
, seek
, 0, 0)) {
1166 printk(KERN_INFO
"ide-tape: %s: position_tape failed in"
1167 " %s\n", tape
->name
, __func__
);
1174 * Generate a read/write request for the block device interface and wait for it
1177 static int idetape_queue_rw_tail(ide_drive_t
*drive
, int cmd
, int blocks
,
1178 struct idetape_bh
*bh
)
1180 idetape_tape_t
*tape
= drive
->driver_data
;
1184 debug_log(DBG_SENSE
, "%s: cmd=%d\n", __func__
, cmd
);
1186 rq
= blk_get_request(drive
->queue
, READ
, __GFP_WAIT
);
1187 rq
->cmd_type
= REQ_TYPE_SPECIAL
;
1189 rq
->rq_disk
= tape
->disk
;
1190 rq
->special
= (void *)bh
;
1191 rq
->sector
= tape
->first_frame
;
1192 rq
->nr_sectors
= blocks
;
1193 rq
->current_nr_sectors
= blocks
;
1194 blk_execute_rq(drive
->queue
, tape
->disk
, rq
, 0);
1196 errors
= rq
->errors
;
1197 ret
= tape
->blk_size
* (blocks
- rq
->current_nr_sectors
);
1198 blk_put_request(rq
);
1200 if ((cmd
& (REQ_IDETAPE_READ
| REQ_IDETAPE_WRITE
)) == 0)
1204 idetape_init_merge_buffer(tape
);
1205 if (errors
== IDE_DRV_ERROR_GENERAL
)
1210 static void idetape_create_inquiry_cmd(struct ide_atapi_pc
*pc
)
1218 static void idetape_create_rewind_cmd(ide_drive_t
*drive
,
1219 struct ide_atapi_pc
*pc
)
1222 pc
->c
[0] = REZERO_UNIT
;
1223 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1226 static void idetape_create_erase_cmd(struct ide_atapi_pc
*pc
)
1231 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1234 static void idetape_create_space_cmd(struct ide_atapi_pc
*pc
, int count
, u8 cmd
)
1238 put_unaligned(cpu_to_be32(count
), (unsigned int *) &pc
->c
[1]);
1240 pc
->flags
|= PC_FLAG_WAIT_FOR_DSC
;
1243 /* Queue up a character device originated write request. */
1244 static int idetape_add_chrdev_write_request(ide_drive_t
*drive
, int blocks
)
1246 idetape_tape_t
*tape
= drive
->driver_data
;
1248 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1250 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
,
1251 blocks
, tape
->merge_bh
);
1254 static void ide_tape_flush_merge_buffer(ide_drive_t
*drive
)
1256 idetape_tape_t
*tape
= drive
->driver_data
;
1258 struct idetape_bh
*bh
;
1260 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1261 printk(KERN_ERR
"ide-tape: bug: Trying to empty merge buffer"
1262 " but we are not writing.\n");
1265 if (tape
->merge_bh_size
> tape
->buffer_size
) {
1266 printk(KERN_ERR
"ide-tape: bug: merge_buffer too big\n");
1267 tape
->merge_bh_size
= tape
->buffer_size
;
1269 if (tape
->merge_bh_size
) {
1270 blocks
= tape
->merge_bh_size
/ tape
->blk_size
;
1271 if (tape
->merge_bh_size
% tape
->blk_size
) {
1275 i
= tape
->blk_size
- tape
->merge_bh_size
%
1277 bh
= tape
->bh
->b_reqnext
;
1279 atomic_set(&bh
->b_count
, 0);
1285 printk(KERN_INFO
"ide-tape: bug,"
1289 min
= min(i
, (unsigned int)(bh
->b_size
-
1290 atomic_read(&bh
->b_count
)));
1291 memset(bh
->b_data
+ atomic_read(&bh
->b_count
),
1293 atomic_add(min
, &bh
->b_count
);
1298 (void) idetape_add_chrdev_write_request(drive
, blocks
);
1299 tape
->merge_bh_size
= 0;
1301 if (tape
->merge_bh
!= NULL
) {
1302 ide_tape_kfree_buffer(tape
);
1303 tape
->merge_bh
= NULL
;
1305 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1308 static int idetape_init_read(ide_drive_t
*drive
)
1310 idetape_tape_t
*tape
= drive
->driver_data
;
1313 /* Initialize read operation */
1314 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1315 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1316 ide_tape_flush_merge_buffer(drive
);
1317 idetape_flush_tape_buffers(drive
);
1319 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1320 printk(KERN_ERR
"ide-tape: merge_bh_size should be"
1322 tape
->merge_bh_size
= 0;
1324 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1325 if (!tape
->merge_bh
)
1327 tape
->chrdev_dir
= IDETAPE_DIR_READ
;
1330 * Issue a read 0 command to ensure that DSC handshake is
1331 * switched from completion mode to buffer available mode.
1332 * No point in issuing this if DSC overlap isn't supported, some
1333 * drives (Seagate STT3401A) will return an error.
1335 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1336 bytes_read
= idetape_queue_rw_tail(drive
,
1337 REQ_IDETAPE_READ
, 0,
1339 if (bytes_read
< 0) {
1340 ide_tape_kfree_buffer(tape
);
1341 tape
->merge_bh
= NULL
;
1342 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1351 /* called from idetape_chrdev_read() to service a chrdev read request. */
1352 static int idetape_add_chrdev_read_request(ide_drive_t
*drive
, int blocks
)
1354 idetape_tape_t
*tape
= drive
->driver_data
;
1356 debug_log(DBG_PROCS
, "Enter %s, %d blocks\n", __func__
, blocks
);
1358 /* If we are at a filemark, return a read length of 0 */
1359 if (test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1362 idetape_init_read(drive
);
1364 return idetape_queue_rw_tail(drive
, REQ_IDETAPE_READ
, blocks
,
1368 static void idetape_pad_zeros(ide_drive_t
*drive
, int bcount
)
1370 idetape_tape_t
*tape
= drive
->driver_data
;
1371 struct idetape_bh
*bh
;
1377 bh
= tape
->merge_bh
;
1378 count
= min(tape
->buffer_size
, bcount
);
1380 blocks
= count
/ tape
->blk_size
;
1382 atomic_set(&bh
->b_count
,
1383 min(count
, (unsigned int)bh
->b_size
));
1384 memset(bh
->b_data
, 0, atomic_read(&bh
->b_count
));
1385 count
-= atomic_read(&bh
->b_count
);
1388 idetape_queue_rw_tail(drive
, REQ_IDETAPE_WRITE
, blocks
,
1394 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1395 * currently support only one partition.
1397 static int idetape_rewind_tape(ide_drive_t
*drive
)
1399 struct ide_tape_obj
*tape
= drive
->driver_data
;
1400 struct gendisk
*disk
= tape
->disk
;
1402 struct ide_atapi_pc pc
;
1404 debug_log(DBG_SENSE
, "Enter %s\n", __func__
);
1406 idetape_create_rewind_cmd(drive
, &pc
);
1407 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1411 idetape_create_read_position_cmd(&pc
);
1412 retval
= ide_queue_pc_tail(drive
, disk
, &pc
);
1418 /* mtio.h compatible commands should be issued to the chrdev interface. */
1419 static int idetape_blkdev_ioctl(ide_drive_t
*drive
, unsigned int cmd
,
1422 idetape_tape_t
*tape
= drive
->driver_data
;
1423 void __user
*argp
= (void __user
*)arg
;
1425 struct idetape_config
{
1426 int dsc_rw_frequency
;
1427 int dsc_media_access_frequency
;
1431 debug_log(DBG_PROCS
, "Enter %s\n", __func__
);
1435 if (copy_from_user(&config
, argp
, sizeof(config
)))
1437 tape
->best_dsc_rw_freq
= config
.dsc_rw_frequency
;
1440 config
.dsc_rw_frequency
= (int) tape
->best_dsc_rw_freq
;
1441 config
.nr_stages
= 1;
1442 if (copy_to_user(argp
, &config
, sizeof(config
)))
1451 static int idetape_space_over_filemarks(ide_drive_t
*drive
, short mt_op
,
1454 idetape_tape_t
*tape
= drive
->driver_data
;
1455 struct gendisk
*disk
= tape
->disk
;
1456 struct ide_atapi_pc pc
;
1457 int retval
, count
= 0;
1458 int sprev
= !!(tape
->caps
[4] & 0x20);
1462 if (MTBSF
== mt_op
|| MTBSFM
== mt_op
) {
1465 mt_count
= -mt_count
;
1468 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
1469 tape
->merge_bh_size
= 0;
1470 if (test_and_clear_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
))
1472 ide_tape_discard_merge_buffer(drive
, 0);
1478 idetape_create_space_cmd(&pc
, mt_count
- count
,
1479 IDETAPE_SPACE_OVER_FILEMARK
);
1480 return ide_queue_pc_tail(drive
, disk
, &pc
);
1485 retval
= idetape_space_over_filemarks(drive
, MTFSF
,
1489 count
= (MTBSFM
== mt_op
? 1 : -1);
1490 return idetape_space_over_filemarks(drive
, MTFSF
, count
);
1492 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1499 * Our character device read / write functions.
1501 * The tape is optimized to maximize throughput when it is transferring an
1502 * integral number of the "continuous transfer limit", which is a parameter of
1503 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1505 * As of version 1.3 of the driver, the character device provides an abstract
1506 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1507 * same backup/restore procedure is supported. The driver will internally
1508 * convert the requests to the recommended transfer unit, so that an unmatch
1509 * between the user's block size to the recommended size will only result in a
1510 * (slightly) increased driver overhead, but will no longer hit performance.
1511 * This is not applicable to Onstream.
1513 static ssize_t
idetape_chrdev_read(struct file
*file
, char __user
*buf
,
1514 size_t count
, loff_t
*ppos
)
1516 struct ide_tape_obj
*tape
= file
->private_data
;
1517 ide_drive_t
*drive
= tape
->drive
;
1518 ssize_t bytes_read
, temp
, actually_read
= 0, rc
;
1520 u16 ctl
= *(u16
*)&tape
->caps
[12];
1522 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1524 if (tape
->chrdev_dir
!= IDETAPE_DIR_READ
) {
1525 if (test_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
))
1526 if (count
> tape
->blk_size
&&
1527 (count
% tape
->blk_size
) == 0)
1528 tape
->user_bs_factor
= count
/ tape
->blk_size
;
1530 rc
= idetape_init_read(drive
);
1535 if (tape
->merge_bh_size
) {
1536 actually_read
= min((unsigned int)(tape
->merge_bh_size
),
1537 (unsigned int)count
);
1538 if (idetape_copy_stage_to_user(tape
, buf
, actually_read
))
1540 buf
+= actually_read
;
1541 tape
->merge_bh_size
-= actually_read
;
1542 count
-= actually_read
;
1544 while (count
>= tape
->buffer_size
) {
1545 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1546 if (bytes_read
<= 0)
1548 if (idetape_copy_stage_to_user(tape
, buf
, bytes_read
))
1551 count
-= bytes_read
;
1552 actually_read
+= bytes_read
;
1555 bytes_read
= idetape_add_chrdev_read_request(drive
, ctl
);
1556 if (bytes_read
<= 0)
1558 temp
= min((unsigned long)count
, (unsigned long)bytes_read
);
1559 if (idetape_copy_stage_to_user(tape
, buf
, temp
))
1561 actually_read
+= temp
;
1562 tape
->merge_bh_size
= bytes_read
-temp
;
1565 if (!actually_read
&& test_bit(IDE_AFLAG_FILEMARK
, &drive
->atapi_flags
)) {
1566 debug_log(DBG_SENSE
, "%s: spacing over filemark\n", tape
->name
);
1568 idetape_space_over_filemarks(drive
, MTFSF
, 1);
1572 return ret
? ret
: actually_read
;
1575 static ssize_t
idetape_chrdev_write(struct file
*file
, const char __user
*buf
,
1576 size_t count
, loff_t
*ppos
)
1578 struct ide_tape_obj
*tape
= file
->private_data
;
1579 ide_drive_t
*drive
= tape
->drive
;
1580 ssize_t actually_written
= 0;
1582 u16 ctl
= *(u16
*)&tape
->caps
[12];
1584 /* The drive is write protected. */
1585 if (tape
->write_prot
)
1588 debug_log(DBG_CHRDEV
, "Enter %s, count %Zd\n", __func__
, count
);
1590 /* Initialize write operation */
1591 if (tape
->chrdev_dir
!= IDETAPE_DIR_WRITE
) {
1592 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1593 ide_tape_discard_merge_buffer(drive
, 1);
1594 if (tape
->merge_bh
|| tape
->merge_bh_size
) {
1595 printk(KERN_ERR
"ide-tape: merge_bh_size "
1596 "should be 0 now\n");
1597 tape
->merge_bh_size
= 0;
1599 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 0, 0);
1600 if (!tape
->merge_bh
)
1602 tape
->chrdev_dir
= IDETAPE_DIR_WRITE
;
1603 idetape_init_merge_buffer(tape
);
1606 * Issue a write 0 command to ensure that DSC handshake is
1607 * switched from completion mode to buffer available mode. No
1608 * point in issuing this if DSC overlap isn't supported, some
1609 * drives (Seagate STT3401A) will return an error.
1611 if (drive
->dev_flags
& IDE_DFLAG_DSC_OVERLAP
) {
1612 ssize_t retval
= idetape_queue_rw_tail(drive
,
1613 REQ_IDETAPE_WRITE
, 0,
1616 ide_tape_kfree_buffer(tape
);
1617 tape
->merge_bh
= NULL
;
1618 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
1625 if (tape
->merge_bh_size
) {
1626 if (tape
->merge_bh_size
>= tape
->buffer_size
) {
1627 printk(KERN_ERR
"ide-tape: bug: merge buf too big\n");
1628 tape
->merge_bh_size
= 0;
1630 actually_written
= min((unsigned int)
1631 (tape
->buffer_size
- tape
->merge_bh_size
),
1632 (unsigned int)count
);
1633 if (idetape_copy_stage_from_user(tape
, buf
, actually_written
))
1635 buf
+= actually_written
;
1636 tape
->merge_bh_size
+= actually_written
;
1637 count
-= actually_written
;
1639 if (tape
->merge_bh_size
== tape
->buffer_size
) {
1641 tape
->merge_bh_size
= 0;
1642 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1647 while (count
>= tape
->buffer_size
) {
1649 if (idetape_copy_stage_from_user(tape
, buf
, tape
->buffer_size
))
1651 buf
+= tape
->buffer_size
;
1652 count
-= tape
->buffer_size
;
1653 retval
= idetape_add_chrdev_write_request(drive
, ctl
);
1654 actually_written
+= tape
->buffer_size
;
1659 actually_written
+= count
;
1660 if (idetape_copy_stage_from_user(tape
, buf
, count
))
1662 tape
->merge_bh_size
+= count
;
1664 return ret
? ret
: actually_written
;
1667 static int idetape_write_filemark(ide_drive_t
*drive
)
1669 struct ide_tape_obj
*tape
= drive
->driver_data
;
1670 struct ide_atapi_pc pc
;
1672 /* Write a filemark */
1673 idetape_create_write_filemark_cmd(drive
, &pc
, 1);
1674 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1675 printk(KERN_ERR
"ide-tape: Couldn't write a filemark\n");
1682 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1685 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1686 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1687 * usually not supported.
1689 * The following commands are currently not supported:
1691 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1692 * MT_ST_WRITE_THRESHOLD.
1694 static int idetape_mtioctop(ide_drive_t
*drive
, short mt_op
, int mt_count
)
1696 idetape_tape_t
*tape
= drive
->driver_data
;
1697 struct gendisk
*disk
= tape
->disk
;
1698 struct ide_atapi_pc pc
;
1701 debug_log(DBG_ERR
, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1711 return idetape_space_over_filemarks(drive
, mt_op
, mt_count
);
1718 if (tape
->write_prot
)
1720 ide_tape_discard_merge_buffer(drive
, 1);
1721 for (i
= 0; i
< mt_count
; i
++) {
1722 retval
= idetape_write_filemark(drive
);
1728 ide_tape_discard_merge_buffer(drive
, 0);
1729 if (idetape_rewind_tape(drive
))
1733 ide_tape_discard_merge_buffer(drive
, 0);
1734 return ide_do_start_stop(drive
, disk
, IDETAPE_LU_LOAD_MASK
);
1738 * If door is locked, attempt to unlock before
1739 * attempting to eject.
1741 if (tape
->door_locked
) {
1742 if (!ide_set_media_lock(drive
, disk
, 0))
1743 tape
->door_locked
= DOOR_UNLOCKED
;
1745 ide_tape_discard_merge_buffer(drive
, 0);
1746 retval
= ide_do_start_stop(drive
, disk
, !IDETAPE_LU_LOAD_MASK
);
1748 clear_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
);
1751 ide_tape_discard_merge_buffer(drive
, 0);
1752 return idetape_flush_tape_buffers(drive
);
1754 ide_tape_discard_merge_buffer(drive
, 0);
1755 return ide_do_start_stop(drive
, disk
,
1756 IDETAPE_LU_RETENSION_MASK
| IDETAPE_LU_LOAD_MASK
);
1758 idetape_create_space_cmd(&pc
, 0, IDETAPE_SPACE_TO_EOD
);
1759 return ide_queue_pc_tail(drive
, disk
, &pc
);
1761 (void)idetape_rewind_tape(drive
);
1762 idetape_create_erase_cmd(&pc
);
1763 return ide_queue_pc_tail(drive
, disk
, &pc
);
1766 if (mt_count
< tape
->blk_size
||
1767 mt_count
% tape
->blk_size
)
1769 tape
->user_bs_factor
= mt_count
/ tape
->blk_size
;
1770 clear_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1772 set_bit(IDE_AFLAG_DETECT_BS
, &drive
->atapi_flags
);
1775 ide_tape_discard_merge_buffer(drive
, 0);
1776 return idetape_position_tape(drive
,
1777 mt_count
* tape
->user_bs_factor
, tape
->partition
, 0);
1779 ide_tape_discard_merge_buffer(drive
, 0);
1780 return idetape_position_tape(drive
, 0, mt_count
, 0);
1784 retval
= ide_set_media_lock(drive
, disk
, 1);
1787 tape
->door_locked
= DOOR_EXPLICITLY_LOCKED
;
1790 retval
= ide_set_media_lock(drive
, disk
, 0);
1793 tape
->door_locked
= DOOR_UNLOCKED
;
1796 printk(KERN_ERR
"ide-tape: MTIO operation %d not supported\n",
1803 * Our character device ioctls. General mtio.h magnetic io commands are
1804 * supported here, and not in the corresponding block interface. Our own
1805 * ide-tape ioctls are supported on both interfaces.
1807 static int idetape_chrdev_ioctl(struct inode
*inode
, struct file
*file
,
1808 unsigned int cmd
, unsigned long arg
)
1810 struct ide_tape_obj
*tape
= file
->private_data
;
1811 ide_drive_t
*drive
= tape
->drive
;
1815 int block_offset
= 0, position
= tape
->first_frame
;
1816 void __user
*argp
= (void __user
*)arg
;
1818 debug_log(DBG_CHRDEV
, "Enter %s, cmd=%u\n", __func__
, cmd
);
1820 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
) {
1821 ide_tape_flush_merge_buffer(drive
);
1822 idetape_flush_tape_buffers(drive
);
1824 if (cmd
== MTIOCGET
|| cmd
== MTIOCPOS
) {
1825 block_offset
= tape
->merge_bh_size
/
1826 (tape
->blk_size
* tape
->user_bs_factor
);
1827 position
= idetape_read_position(drive
);
1833 if (copy_from_user(&mtop
, argp
, sizeof(struct mtop
)))
1835 return idetape_mtioctop(drive
, mtop
.mt_op
, mtop
.mt_count
);
1837 memset(&mtget
, 0, sizeof(struct mtget
));
1838 mtget
.mt_type
= MT_ISSCSI2
;
1839 mtget
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1841 ((tape
->blk_size
* tape
->user_bs_factor
)
1842 << MT_ST_BLKSIZE_SHIFT
) & MT_ST_BLKSIZE_MASK
;
1844 if (tape
->drv_write_prot
)
1845 mtget
.mt_gstat
|= GMT_WR_PROT(0xffffffff);
1847 if (copy_to_user(argp
, &mtget
, sizeof(struct mtget
)))
1851 mtpos
.mt_blkno
= position
/ tape
->user_bs_factor
- block_offset
;
1852 if (copy_to_user(argp
, &mtpos
, sizeof(struct mtpos
)))
1856 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
)
1857 ide_tape_discard_merge_buffer(drive
, 1);
1858 return idetape_blkdev_ioctl(drive
, cmd
, arg
);
1863 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
1864 * block size with the reported value.
1866 static void ide_tape_get_bsize_from_bdesc(ide_drive_t
*drive
)
1868 idetape_tape_t
*tape
= drive
->driver_data
;
1869 struct ide_atapi_pc pc
;
1871 idetape_create_mode_sense_cmd(&pc
, IDETAPE_BLOCK_DESCRIPTOR
);
1872 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
1873 printk(KERN_ERR
"ide-tape: Can't get block descriptor\n");
1874 if (tape
->blk_size
== 0) {
1875 printk(KERN_WARNING
"ide-tape: Cannot deal with zero "
1876 "block size, assuming 32k\n");
1877 tape
->blk_size
= 32768;
1881 tape
->blk_size
= (pc
.buf
[4 + 5] << 16) +
1882 (pc
.buf
[4 + 6] << 8) +
1884 tape
->drv_write_prot
= (pc
.buf
[2] & 0x80) >> 7;
1887 static int idetape_chrdev_open(struct inode
*inode
, struct file
*filp
)
1889 unsigned int minor
= iminor(inode
), i
= minor
& ~0xc0;
1891 idetape_tape_t
*tape
;
1894 if (i
>= MAX_HWIFS
* MAX_DRIVES
)
1898 tape
= ide_tape_chrdev_get(i
);
1904 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1907 * We really want to do nonseekable_open(inode, filp); here, but some
1908 * versions of tar incorrectly call lseek on tapes and bail out if that
1909 * fails. So we disallow pread() and pwrite(), but permit lseeks.
1911 filp
->f_mode
&= ~(FMODE_PREAD
| FMODE_PWRITE
);
1913 drive
= tape
->drive
;
1915 filp
->private_data
= tape
;
1917 if (test_and_set_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
)) {
1922 retval
= idetape_wait_ready(drive
, 60 * HZ
);
1924 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1925 printk(KERN_ERR
"ide-tape: %s: drive not ready\n", tape
->name
);
1929 idetape_read_position(drive
);
1930 if (!test_bit(IDE_AFLAG_ADDRESS_VALID
, &drive
->atapi_flags
))
1931 (void)idetape_rewind_tape(drive
);
1933 /* Read block size and write protect status from drive. */
1934 ide_tape_get_bsize_from_bdesc(drive
);
1936 /* Set write protect flag if device is opened as read-only. */
1937 if ((filp
->f_flags
& O_ACCMODE
) == O_RDONLY
)
1938 tape
->write_prot
= 1;
1940 tape
->write_prot
= tape
->drv_write_prot
;
1942 /* Make sure drive isn't write protected if user wants to write. */
1943 if (tape
->write_prot
) {
1944 if ((filp
->f_flags
& O_ACCMODE
) == O_WRONLY
||
1945 (filp
->f_flags
& O_ACCMODE
) == O_RDWR
) {
1946 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
1952 /* Lock the tape drive door so user can't eject. */
1953 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
1954 if (!ide_set_media_lock(drive
, tape
->disk
, 1)) {
1955 if (tape
->door_locked
!= DOOR_EXPLICITLY_LOCKED
)
1956 tape
->door_locked
= DOOR_LOCKED
;
1968 static void idetape_write_release(ide_drive_t
*drive
, unsigned int minor
)
1970 idetape_tape_t
*tape
= drive
->driver_data
;
1972 ide_tape_flush_merge_buffer(drive
);
1973 tape
->merge_bh
= ide_tape_kmalloc_buffer(tape
, 1, 0);
1974 if (tape
->merge_bh
!= NULL
) {
1975 idetape_pad_zeros(drive
, tape
->blk_size
*
1976 (tape
->user_bs_factor
- 1));
1977 ide_tape_kfree_buffer(tape
);
1978 tape
->merge_bh
= NULL
;
1980 idetape_write_filemark(drive
);
1981 idetape_flush_tape_buffers(drive
);
1982 idetape_flush_tape_buffers(drive
);
1985 static int idetape_chrdev_release(struct inode
*inode
, struct file
*filp
)
1987 struct ide_tape_obj
*tape
= filp
->private_data
;
1988 ide_drive_t
*drive
= tape
->drive
;
1989 unsigned int minor
= iminor(inode
);
1992 tape
= drive
->driver_data
;
1994 debug_log(DBG_CHRDEV
, "Enter %s\n", __func__
);
1996 if (tape
->chrdev_dir
== IDETAPE_DIR_WRITE
)
1997 idetape_write_release(drive
, minor
);
1998 if (tape
->chrdev_dir
== IDETAPE_DIR_READ
) {
2000 ide_tape_discard_merge_buffer(drive
, 1);
2003 if (minor
< 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT
, &drive
->atapi_flags
))
2004 (void) idetape_rewind_tape(drive
);
2005 if (tape
->chrdev_dir
== IDETAPE_DIR_NONE
) {
2006 if (tape
->door_locked
== DOOR_LOCKED
) {
2007 if (!ide_set_media_lock(drive
, tape
->disk
, 0))
2008 tape
->door_locked
= DOOR_UNLOCKED
;
2011 clear_bit(IDE_AFLAG_BUSY
, &drive
->atapi_flags
);
2017 static void idetape_get_inquiry_results(ide_drive_t
*drive
)
2019 idetape_tape_t
*tape
= drive
->driver_data
;
2020 struct ide_atapi_pc pc
;
2022 char fw_rev
[4], vendor_id
[8], product_id
[16];
2024 idetape_create_inquiry_cmd(&pc
);
2025 pc
.buf
= &pc_buf
[0];
2026 pc
.buf_size
= sizeof(pc_buf
);
2028 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2029 printk(KERN_ERR
"ide-tape: %s: can't get INQUIRY results\n",
2033 memcpy(vendor_id
, &pc
.buf
[8], 8);
2034 memcpy(product_id
, &pc
.buf
[16], 16);
2035 memcpy(fw_rev
, &pc
.buf
[32], 4);
2037 ide_fixstring(vendor_id
, 8, 0);
2038 ide_fixstring(product_id
, 16, 0);
2039 ide_fixstring(fw_rev
, 4, 0);
2041 printk(KERN_INFO
"ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2042 drive
->name
, tape
->name
, vendor_id
, product_id
, fw_rev
);
2046 * Ask the tape about its various parameters. In particular, we will adjust our
2047 * data transfer buffer size to the recommended value as returned by the tape.
2049 static void idetape_get_mode_sense_results(ide_drive_t
*drive
)
2051 idetape_tape_t
*tape
= drive
->driver_data
;
2052 struct ide_atapi_pc pc
;
2054 u8 speed
, max_speed
;
2056 idetape_create_mode_sense_cmd(&pc
, IDETAPE_CAPABILITIES_PAGE
);
2057 if (ide_queue_pc_tail(drive
, tape
->disk
, &pc
)) {
2058 printk(KERN_ERR
"ide-tape: Can't get tape parameters - assuming"
2059 " some default values\n");
2060 tape
->blk_size
= 512;
2061 put_unaligned(52, (u16
*)&tape
->caps
[12]);
2062 put_unaligned(540, (u16
*)&tape
->caps
[14]);
2063 put_unaligned(6*52, (u16
*)&tape
->caps
[16]);
2066 caps
= pc
.buf
+ 4 + pc
.buf
[3];
2068 /* convert to host order and save for later use */
2069 speed
= be16_to_cpup((__be16
*)&caps
[14]);
2070 max_speed
= be16_to_cpup((__be16
*)&caps
[8]);
2072 *(u16
*)&caps
[8] = max_speed
;
2073 *(u16
*)&caps
[12] = be16_to_cpup((__be16
*)&caps
[12]);
2074 *(u16
*)&caps
[14] = speed
;
2075 *(u16
*)&caps
[16] = be16_to_cpup((__be16
*)&caps
[16]);
2078 printk(KERN_INFO
"ide-tape: %s: invalid tape speed "
2079 "(assuming 650KB/sec)\n", drive
->name
);
2080 *(u16
*)&caps
[14] = 650;
2083 printk(KERN_INFO
"ide-tape: %s: invalid max_speed "
2084 "(assuming 650KB/sec)\n", drive
->name
);
2085 *(u16
*)&caps
[8] = 650;
2088 memcpy(&tape
->caps
, caps
, 20);
2090 /* device lacks locking support according to capabilities page */
2091 if ((caps
[6] & 1) == 0)
2092 drive
->dev_flags
&= ~IDE_DFLAG_DOORLOCKING
;
2095 tape
->blk_size
= 512;
2096 else if (caps
[7] & 0x04)
2097 tape
->blk_size
= 1024;
2100 #ifdef CONFIG_IDE_PROC_FS
2101 #define ide_tape_devset_get(name, field) \
2102 static int get_##name(ide_drive_t *drive) \
2104 idetape_tape_t *tape = drive->driver_data; \
2105 return tape->field; \
2108 #define ide_tape_devset_set(name, field) \
2109 static int set_##name(ide_drive_t *drive, int arg) \
2111 idetape_tape_t *tape = drive->driver_data; \
2112 tape->field = arg; \
2116 #define ide_tape_devset_rw_field(_name, _field) \
2117 ide_tape_devset_get(_name, _field) \
2118 ide_tape_devset_set(_name, _field) \
2119 IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)
2121 #define ide_tape_devset_r_field(_name, _field) \
2122 ide_tape_devset_get(_name, _field) \
2123 IDE_DEVSET(_name, 0, get_##_name, NULL)
2125 static int mulf_tdsc(ide_drive_t
*drive
) { return 1000; }
2126 static int divf_tdsc(ide_drive_t
*drive
) { return HZ
; }
2127 static int divf_buffer(ide_drive_t
*drive
) { return 2; }
2128 static int divf_buffer_size(ide_drive_t
*drive
) { return 1024; }
2130 ide_devset_rw_flag(dsc_overlap
, IDE_DFLAG_DSC_OVERLAP
);
2132 ide_tape_devset_rw_field(debug_mask
, debug_mask
);
2133 ide_tape_devset_rw_field(tdsc
, best_dsc_rw_freq
);
2135 ide_tape_devset_r_field(avg_speed
, avg_speed
);
2136 ide_tape_devset_r_field(speed
, caps
[14]);
2137 ide_tape_devset_r_field(buffer
, caps
[16]);
2138 ide_tape_devset_r_field(buffer_size
, buffer_size
);
2140 static const struct ide_proc_devset idetape_settings
[] = {
2141 __IDE_PROC_DEVSET(avg_speed
, 0, 0xffff, NULL
, NULL
),
2142 __IDE_PROC_DEVSET(buffer
, 0, 0xffff, NULL
, divf_buffer
),
2143 __IDE_PROC_DEVSET(buffer_size
, 0, 0xffff, NULL
, divf_buffer_size
),
2144 __IDE_PROC_DEVSET(debug_mask
, 0, 0xffff, NULL
, NULL
),
2145 __IDE_PROC_DEVSET(dsc_overlap
, 0, 1, NULL
, NULL
),
2146 __IDE_PROC_DEVSET(speed
, 0, 0xffff, NULL
, NULL
),
2147 __IDE_PROC_DEVSET(tdsc
, IDETAPE_DSC_RW_MIN
, IDETAPE_DSC_RW_MAX
,
2148 mulf_tdsc
, divf_tdsc
),
2154 * The function below is called to:
2156 * 1. Initialize our various state variables.
2157 * 2. Ask the tape for its capabilities.
2158 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2159 * is chosen based on the recommendation which we received in step 2.
2161 * Note that at this point ide.c already assigned us an irq, so that we can
2162 * queue requests here and wait for their completion.
2164 static void idetape_setup(ide_drive_t
*drive
, idetape_tape_t
*tape
, int minor
)
2169 u16
*ctl
= (u16
*)&tape
->caps
[12];
2171 drive
->pc_callback
= ide_tape_callback
;
2172 drive
->pc_update_buffers
= idetape_update_buffers
;
2173 drive
->pc_io_buffers
= ide_tape_io_buffers
;
2175 drive
->dev_flags
|= IDE_DFLAG_DSC_OVERLAP
;
2177 if (drive
->hwif
->host_flags
& IDE_HFLAG_NO_DSC
) {
2178 printk(KERN_INFO
"ide-tape: %s: disabling DSC overlap\n",
2180 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2183 /* Seagate Travan drives do not support DSC overlap. */
2184 if (strstr((char *)&drive
->id
[ATA_ID_PROD
], "Seagate STT3401"))
2185 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2187 tape
->minor
= minor
;
2188 tape
->name
[0] = 'h';
2189 tape
->name
[1] = 't';
2190 tape
->name
[2] = '0' + minor
;
2191 tape
->chrdev_dir
= IDETAPE_DIR_NONE
;
2193 idetape_get_inquiry_results(drive
);
2194 idetape_get_mode_sense_results(drive
);
2195 ide_tape_get_bsize_from_bdesc(drive
);
2196 tape
->user_bs_factor
= 1;
2197 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2198 while (tape
->buffer_size
> 0xffff) {
2199 printk(KERN_NOTICE
"ide-tape: decreasing stage size\n");
2201 tape
->buffer_size
= *ctl
* tape
->blk_size
;
2203 buffer_size
= tape
->buffer_size
;
2204 tape
->pages_per_buffer
= buffer_size
/ PAGE_SIZE
;
2205 if (buffer_size
% PAGE_SIZE
) {
2206 tape
->pages_per_buffer
++;
2207 tape
->excess_bh_size
= PAGE_SIZE
- buffer_size
% PAGE_SIZE
;
2210 /* select the "best" DSC read/write polling freq */
2211 speed
= max(*(u16
*)&tape
->caps
[14], *(u16
*)&tape
->caps
[8]);
2213 t
= (IDETAPE_FIFO_THRESHOLD
* tape
->buffer_size
* HZ
) / (speed
* 1000);
2216 * Ensure that the number we got makes sense; limit it within
2217 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2219 tape
->best_dsc_rw_freq
= clamp_t(unsigned long, t
, IDETAPE_DSC_RW_MIN
,
2220 IDETAPE_DSC_RW_MAX
);
2221 printk(KERN_INFO
"ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2223 drive
->name
, tape
->name
, *(u16
*)&tape
->caps
[14],
2224 (*(u16
*)&tape
->caps
[16] * 512) / tape
->buffer_size
,
2225 tape
->buffer_size
/ 1024,
2226 tape
->best_dsc_rw_freq
* 1000 / HZ
,
2227 (drive
->dev_flags
& IDE_DFLAG_USING_DMA
) ? ", DMA" : "");
2229 ide_proc_register_driver(drive
, tape
->driver
);
2232 static void ide_tape_remove(ide_drive_t
*drive
)
2234 idetape_tape_t
*tape
= drive
->driver_data
;
2236 ide_proc_unregister_driver(drive
, tape
->driver
);
2237 device_del(&tape
->dev
);
2238 ide_unregister_region(tape
->disk
);
2240 mutex_lock(&idetape_ref_mutex
);
2241 put_device(&tape
->dev
);
2242 mutex_unlock(&idetape_ref_mutex
);
2245 static void ide_tape_release(struct device
*dev
)
2247 struct ide_tape_obj
*tape
= to_ide_drv(dev
, ide_tape_obj
);
2248 ide_drive_t
*drive
= tape
->drive
;
2249 struct gendisk
*g
= tape
->disk
;
2251 BUG_ON(tape
->merge_bh_size
);
2253 drive
->dev_flags
&= ~IDE_DFLAG_DSC_OVERLAP
;
2254 drive
->driver_data
= NULL
;
2255 device_destroy(idetape_sysfs_class
, MKDEV(IDETAPE_MAJOR
, tape
->minor
));
2256 device_destroy(idetape_sysfs_class
,
2257 MKDEV(IDETAPE_MAJOR
, tape
->minor
+ 128));
2258 idetape_devs
[tape
->minor
] = NULL
;
2259 g
->private_data
= NULL
;
2264 #ifdef CONFIG_IDE_PROC_FS
2265 static int proc_idetape_read_name
2266 (char *page
, char **start
, off_t off
, int count
, int *eof
, void *data
)
2268 ide_drive_t
*drive
= (ide_drive_t
*) data
;
2269 idetape_tape_t
*tape
= drive
->driver_data
;
2273 len
= sprintf(out
, "%s\n", tape
->name
);
2274 PROC_IDE_READ_RETURN(page
, start
, off
, count
, eof
, len
);
2277 static ide_proc_entry_t idetape_proc
[] = {
2278 { "capacity", S_IFREG
|S_IRUGO
, proc_ide_read_capacity
, NULL
},
2279 { "name", S_IFREG
|S_IRUGO
, proc_idetape_read_name
, NULL
},
2280 { NULL
, 0, NULL
, NULL
}
2283 static ide_proc_entry_t
*ide_tape_proc_entries(ide_drive_t
*drive
)
2285 return idetape_proc
;
2288 static const struct ide_proc_devset
*ide_tape_proc_devsets(ide_drive_t
*drive
)
2290 return idetape_settings
;
2294 static int ide_tape_probe(ide_drive_t
*);
2296 static struct ide_driver idetape_driver
= {
2298 .owner
= THIS_MODULE
,
2300 .bus
= &ide_bus_type
,
2302 .probe
= ide_tape_probe
,
2303 .remove
= ide_tape_remove
,
2304 .version
= IDETAPE_VERSION
,
2305 .do_request
= idetape_do_request
,
2306 #ifdef CONFIG_IDE_PROC_FS
2307 .proc_entries
= ide_tape_proc_entries
,
2308 .proc_devsets
= ide_tape_proc_devsets
,
2312 /* Our character device supporting functions, passed to register_chrdev. */
2313 static const struct file_operations idetape_fops
= {
2314 .owner
= THIS_MODULE
,
2315 .read
= idetape_chrdev_read
,
2316 .write
= idetape_chrdev_write
,
2317 .ioctl
= idetape_chrdev_ioctl
,
2318 .open
= idetape_chrdev_open
,
2319 .release
= idetape_chrdev_release
,
2322 static int idetape_open(struct block_device
*bdev
, fmode_t mode
)
2324 struct ide_tape_obj
*tape
= ide_tape_get(bdev
->bd_disk
);
2332 static int idetape_release(struct gendisk
*disk
, fmode_t mode
)
2334 struct ide_tape_obj
*tape
= ide_drv_g(disk
, ide_tape_obj
);
2340 static int idetape_ioctl(struct block_device
*bdev
, fmode_t mode
,
2341 unsigned int cmd
, unsigned long arg
)
2343 struct ide_tape_obj
*tape
= ide_drv_g(bdev
->bd_disk
, ide_tape_obj
);
2344 ide_drive_t
*drive
= tape
->drive
;
2345 int err
= generic_ide_ioctl(drive
, bdev
, cmd
, arg
);
2347 err
= idetape_blkdev_ioctl(drive
, cmd
, arg
);
2351 static struct block_device_operations idetape_block_ops
= {
2352 .owner
= THIS_MODULE
,
2353 .open
= idetape_open
,
2354 .release
= idetape_release
,
2355 .locked_ioctl
= idetape_ioctl
,
2358 static int ide_tape_probe(ide_drive_t
*drive
)
2360 idetape_tape_t
*tape
;
2364 if (!strstr("ide-tape", drive
->driver_req
))
2367 if (drive
->media
!= ide_tape
)
2370 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) &&
2371 ide_check_atapi_device(drive
, DRV_NAME
) == 0) {
2372 printk(KERN_ERR
"ide-tape: %s: not supported by this version of"
2373 " the driver\n", drive
->name
);
2376 tape
= kzalloc(sizeof(idetape_tape_t
), GFP_KERNEL
);
2378 printk(KERN_ERR
"ide-tape: %s: Can't allocate a tape struct\n",
2383 g
= alloc_disk(1 << PARTN_BITS
);
2387 ide_init_disk(g
, drive
);
2389 tape
->dev
.parent
= &drive
->gendev
;
2390 tape
->dev
.release
= ide_tape_release
;
2391 dev_set_name(&tape
->dev
, dev_name(&drive
->gendev
));
2393 if (device_register(&tape
->dev
))
2396 tape
->drive
= drive
;
2397 tape
->driver
= &idetape_driver
;
2400 g
->private_data
= &tape
->driver
;
2402 drive
->driver_data
= tape
;
2404 mutex_lock(&idetape_ref_mutex
);
2405 for (minor
= 0; idetape_devs
[minor
]; minor
++)
2407 idetape_devs
[minor
] = tape
;
2408 mutex_unlock(&idetape_ref_mutex
);
2410 idetape_setup(drive
, tape
, minor
);
2412 device_create(idetape_sysfs_class
, &drive
->gendev
,
2413 MKDEV(IDETAPE_MAJOR
, minor
), NULL
, "%s", tape
->name
);
2414 device_create(idetape_sysfs_class
, &drive
->gendev
,
2415 MKDEV(IDETAPE_MAJOR
, minor
+ 128), NULL
,
2418 g
->fops
= &idetape_block_ops
;
2419 ide_register_region(g
);
2431 static void __exit
idetape_exit(void)
2433 driver_unregister(&idetape_driver
.gen_driver
);
2434 class_destroy(idetape_sysfs_class
);
2435 unregister_chrdev(IDETAPE_MAJOR
, "ht");
2438 static int __init
idetape_init(void)
2441 idetape_sysfs_class
= class_create(THIS_MODULE
, "ide_tape");
2442 if (IS_ERR(idetape_sysfs_class
)) {
2443 idetape_sysfs_class
= NULL
;
2444 printk(KERN_ERR
"Unable to create sysfs class for ide tapes\n");
2449 if (register_chrdev(IDETAPE_MAJOR
, "ht", &idetape_fops
)) {
2450 printk(KERN_ERR
"ide-tape: Failed to register chrdev"
2453 goto out_free_class
;
2456 error
= driver_register(&idetape_driver
.gen_driver
);
2458 goto out_free_driver
;
2463 driver_unregister(&idetape_driver
.gen_driver
);
2465 class_destroy(idetape_sysfs_class
);
2470 MODULE_ALIAS("ide:*m-tape*");
2471 module_init(idetape_init
);
2472 module_exit(idetape_exit
);
2473 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR
);
2474 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2475 MODULE_LICENSE("GPL");