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 * With each packet command, we allocate a buffer of IDETAPE_PC_BUFFER_SIZE
85 * bytes. This is used for several packet commands (Not for READ/WRITE commands)
87 #define IDETAPE_PC_BUFFER_SIZE 256
90 * Some drives (for example, Seagate STT3401A Travan) require a very long
91 * timeout, because they don't return an interrupt or clear their busy bit
92 * until after the command completes (even retension commands).
94 #define IDETAPE_WAIT_CMD (900*HZ)
97 * The following parameter is used to select the point in the internal tape fifo
98 * in which we will start to refill the buffer. Decreasing the following
99 * parameter will improve the system's latency and interactive response, while
100 * using a high value might improve system throughput.
102 #define IDETAPE_FIFO_THRESHOLD 2
105 * DSC polling parameters.
107 * Polling for DSC (a single bit in the status register) is a very important
108 * function in ide-tape. There are two cases in which we poll for DSC:
110 * 1. Before a read/write packet command, to ensure that we can transfer data
111 * from/to the tape's data buffers, without causing an actual media access.
112 * In case the tape is not ready yet, we take out our request from the device
113 * request queue, so that ide.c could service requests from the other device
114 * on the same interface in the meantime.
116 * 2. After the successful initialization of a "media access packet command",
117 * which is a command that can take a long time to complete (the interval can
118 * range from several seconds to even an hour). Again, we postpone our request
119 * in the middle to free the bus for the other device. The polling frequency
120 * here should be lower than the read/write frequency since those media access
121 * commands are slow. We start from a "fast" frequency - IDETAPE_DSC_MA_FAST
122 * (1 second), and if we don't receive DSC after IDETAPE_DSC_MA_THRESHOLD
123 * (5 min), we switch it to a lower frequency - IDETAPE_DSC_MA_SLOW (1 min).
125 * We also set a timeout for the timer, in case something goes wrong. The
126 * timeout should be longer then the maximum execution time of a tape operation.
130 #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
131 #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
132 #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
133 #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
134 #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
135 #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
136 #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
138 /*************************** End of tunable parameters ***********************/
140 /* tape directions */
142 IDETAPE_DIR_NONE = (1 << 0),
143 IDETAPE_DIR_READ = (1 << 1),
144 IDETAPE_DIR_WRITE = (1 << 2),
150 struct idetape_bh *b_reqnext;
154 /* Tape door status */
155 #define DOOR_UNLOCKED 0
156 #define DOOR_LOCKED 1
157 #define DOOR_EXPLICITLY_LOCKED 2
159 /* Some defines for the SPACE command */
160 #define IDETAPE_SPACE_OVER_FILEMARK 1
161 #define IDETAPE_SPACE_TO_EOD 3
163 /* Some defines for the LOAD UNLOAD command */
164 #define IDETAPE_LU_LOAD_MASK 1
165 #define IDETAPE_LU_RETENSION_MASK 2
166 #define IDETAPE_LU_EOT_MASK 4
169 * Special requests for our block device strategy routine.
171 * In order to service a character device command, we add special requests to
172 * the tail of our block device request queue and wait for their completion.
176 REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
177 REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
178 REQ_IDETAPE_READ = (1 << 2),
179 REQ_IDETAPE_WRITE = (1 << 3),
182 /* Error codes returned in rq->errors to the higher part of the driver. */
183 #define IDETAPE_ERROR_GENERAL 101
184 #define IDETAPE_ERROR_FILEMARK 102
185 #define IDETAPE_ERROR_EOD 103
187 /* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
188 #define IDETAPE_BLOCK_DESCRIPTOR 0
189 #define IDETAPE_CAPABILITIES_PAGE 0x2a
192 * Most of our global data which we need to save even as we leave the driver due
193 * to an interrupt or a timer event is stored in the struct defined below.
195 typedef struct ide_tape_obj {
197 ide_driver_t *driver;
198 struct gendisk *disk;
202 * pc points to the current processed packet command.
204 * failed_pc points to the last failed packet command, or contains
205 * NULL if we do not need to retry any packet command. This is
206 * required since an additional packet command is needed before the
207 * retry, to get detailed information on what went wrong.
209 /* Current packet command */
210 struct ide_atapi_pc *pc;
211 /* Last failed packet command */
212 struct ide_atapi_pc *failed_pc;
213 /* used by REQ_IDETAPE_{READ,WRITE} requests */
214 struct ide_atapi_pc queued_pc;
216 struct ide_atapi_pc request_sense_pc;
217 struct request request_sense_rq;
220 * DSC polling variables.
222 * While polling for DSC we use postponed_rq to postpone the current
223 * request so that ide.c will be able to service pending requests on the
224 * other device. Note that at most we will have only one DSC (usually
225 * data transfer) request in the device request queue.
227 struct request *postponed_rq;
228 /* The time in which we started polling for DSC */
229 unsigned long dsc_polling_start;
230 /* Timer used to poll for dsc */
231 struct timer_list dsc_timer;
232 /* Read/Write dsc polling frequency */
233 unsigned long best_dsc_rw_freq;
234 unsigned long dsc_poll_freq;
235 unsigned long dsc_timeout;
237 /* Read position information */
240 unsigned int first_frame;
242 /* Last error information */
243 u8 sense_key, asc, ascq;
245 /* Character device operation */
249 /* Current character device data transfer direction */
252 /* tape block size, usually 512 or 1024 bytes */
253 unsigned short blk_size;
256 /* Copy of the tape's Capabilities and Mechanical Page */
260 * Active data transfer request parameters.
262 * At most, there is only one ide-tape originated data transfer request
263 * in the device request queue. This allows ide.c to easily service
264 * requests from the other device when we postpone our active request.
267 /* Data buffer size chosen based on the tape's recommendation */
270 struct idetape_bh *merge_bh;
271 /* size of the merge buffer */
273 /* pointer to current buffer head within the merge buffer */
274 struct idetape_bh *bh;
278 int pages_per_buffer;
279 /* Wasted space in each stage */
282 /* protects the ide-tape queue */
285 /* Measures average tape speed */
286 unsigned long avg_time;
290 /* the door is currently locked */
292 /* the tape hardware is write protected */
294 /* the tape is write protected (hardware or opened as read-only) */
300 static DEFINE_MUTEX(idetape_ref_mutex);
302 static struct class *idetape_sysfs_class;
304 #define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
306 #define ide_tape_g(disk) \
307 container_of((disk)->private_data, struct ide_tape_obj, driver)
309 static void ide_tape_release(struct kref *);
311 static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
313 struct ide_tape_obj *tape = NULL;
315 mutex_lock(&idetape_ref_mutex);
316 tape = ide_tape_g(disk);
318 if (ide_device_get(tape->drive))
321 kref_get(&tape->kref);
323 mutex_unlock(&idetape_ref_mutex);
327 static void ide_tape_put(struct ide_tape_obj *tape)
329 ide_drive_t *drive = tape->drive;
331 mutex_lock(&idetape_ref_mutex);
332 kref_put(&tape->kref, ide_tape_release);
333 ide_device_put(drive);
334 mutex_unlock(&idetape_ref_mutex);
338 * The variables below are used for the character device interface. Additional
339 * state variables are defined in our ide_drive_t structure.
341 static struct ide_tape_obj *idetape_devs[MAX_HWIFS * MAX_DRIVES];
343 #define ide_tape_f(file) ((file)->private_data)
345 static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
347 struct ide_tape_obj *tape = NULL;
349 mutex_lock(&idetape_ref_mutex);
350 tape = idetape_devs[i];
352 kref_get(&tape->kref);
353 mutex_unlock(&idetape_ref_mutex);
357 static void idetape_input_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
360 struct idetape_bh *bh = pc->bh;
365 printk(KERN_ERR "ide-tape: bh == NULL in "
366 "idetape_input_buffers\n");
367 ide_pad_transfer(drive, 0, bcount);
371 (unsigned int)(bh->b_size - atomic_read(&bh->b_count)),
373 drive->hwif->tp_ops->input_data(drive, NULL, bh->b_data +
374 atomic_read(&bh->b_count), count);
376 atomic_add(count, &bh->b_count);
377 if (atomic_read(&bh->b_count) == bh->b_size) {
380 atomic_set(&bh->b_count, 0);
386 static void idetape_output_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
389 struct idetape_bh *bh = pc->bh;
394 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
398 count = min((unsigned int)pc->b_count, (unsigned int)bcount);
399 drive->hwif->tp_ops->output_data(drive, NULL, pc->b_data, count);
402 pc->b_count -= count;
407 pc->b_data = bh->b_data;
408 pc->b_count = atomic_read(&bh->b_count);
414 static void idetape_update_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc)
416 struct idetape_bh *bh = pc->bh;
418 unsigned int bcount = pc->xferred;
420 if (pc->flags & PC_FLAG_WRITING)
424 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
428 count = min((unsigned int)bh->b_size, (unsigned int)bcount);
429 atomic_set(&bh->b_count, count);
430 if (atomic_read(&bh->b_count) == bh->b_size)
438 * called on each failed packet command retry to analyze the request sense. We
439 * currently do not utilize this information.
441 static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
443 idetape_tape_t *tape = drive->driver_data;
444 struct ide_atapi_pc *pc = tape->failed_pc;
446 tape->sense_key = sense[2] & 0xF;
447 tape->asc = sense[12];
448 tape->ascq = sense[13];
450 debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
451 pc->c[0], tape->sense_key, tape->asc, tape->ascq);
453 /* Correct pc->xferred by asking the tape. */
454 if (pc->flags & PC_FLAG_DMA_ERROR) {
455 pc->xferred = pc->req_xfer -
457 get_unaligned_be32(&sense[3]);
458 idetape_update_buffers(drive, pc);
462 * If error was the result of a zero-length read or write command,
463 * with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
464 * (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
466 if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
468 && pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
469 if (tape->sense_key == 5) {
470 /* don't report an error, everything's ok */
472 /* don't retry read/write */
473 pc->flags |= PC_FLAG_ABORT;
476 if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
477 pc->error = IDETAPE_ERROR_FILEMARK;
478 pc->flags |= PC_FLAG_ABORT;
480 if (pc->c[0] == WRITE_6) {
481 if ((sense[2] & 0x40) || (tape->sense_key == 0xd
482 && tape->asc == 0x0 && tape->ascq == 0x2)) {
483 pc->error = IDETAPE_ERROR_EOD;
484 pc->flags |= PC_FLAG_ABORT;
487 if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
488 if (tape->sense_key == 8) {
489 pc->error = IDETAPE_ERROR_EOD;
490 pc->flags |= PC_FLAG_ABORT;
492 if (!(pc->flags & PC_FLAG_ABORT) &&
494 pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
498 /* Free data buffers completely. */
499 static void ide_tape_kfree_buffer(idetape_tape_t *tape)
501 struct idetape_bh *prev_bh, *bh = tape->merge_bh;
504 u32 size = bh->b_size;
507 unsigned int order = fls(size >> PAGE_SHIFT)-1;
510 free_pages((unsigned long)bh->b_data, order);
513 bh->b_data += (1 << order) * PAGE_SIZE;
521 static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
523 struct request *rq = HWGROUP(drive)->rq;
524 idetape_tape_t *tape = drive->driver_data;
528 debug_log(DBG_PROCS, "Enter %s\n", __func__);
531 case 0: error = IDETAPE_ERROR_GENERAL; break;
532 case 1: error = 0; break;
533 default: error = uptodate;
537 tape->failed_pc = NULL;
539 if (!blk_special_request(rq)) {
540 ide_end_request(drive, uptodate, nr_sects);
544 spin_lock_irqsave(&tape->lock, flags);
546 ide_end_drive_cmd(drive, 0, 0);
548 spin_unlock_irqrestore(&tape->lock, flags);
552 static void ide_tape_callback(ide_drive_t *drive)
554 idetape_tape_t *tape = drive->driver_data;
555 struct ide_atapi_pc *pc = tape->pc;
556 int uptodate = pc->error ? 0 : 1;
558 debug_log(DBG_PROCS, "Enter %s\n", __func__);
560 if (tape->failed_pc == pc)
561 tape->failed_pc = NULL;
563 if (pc->c[0] == REQUEST_SENSE) {
565 idetape_analyze_error(drive, pc->buf);
567 printk(KERN_ERR "ide-tape: Error in REQUEST SENSE "
568 "itself - Aborting request!\n");
569 } else if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
570 struct request *rq = drive->hwif->hwgroup->rq;
571 int blocks = pc->xferred / tape->blk_size;
573 tape->avg_size += blocks * tape->blk_size;
575 if (time_after_eq(jiffies, tape->avg_time + HZ)) {
576 tape->avg_speed = tape->avg_size * HZ /
577 (jiffies - tape->avg_time) / 1024;
579 tape->avg_time = jiffies;
582 tape->first_frame += blocks;
583 rq->current_nr_sectors -= blocks;
586 uptodate = pc->error;
587 } else if (pc->c[0] == READ_POSITION && uptodate) {
588 u8 *readpos = tape->pc->buf;
590 debug_log(DBG_SENSE, "BOP - %s\n",
591 (readpos[0] & 0x80) ? "Yes" : "No");
592 debug_log(DBG_SENSE, "EOP - %s\n",
593 (readpos[0] & 0x40) ? "Yes" : "No");
595 if (readpos[0] & 0x4) {
596 printk(KERN_INFO "ide-tape: Block location is unknown"
598 clear_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
601 debug_log(DBG_SENSE, "Block Location - %u\n",
602 be32_to_cpup((__be32 *)&readpos[4]));
604 tape->partition = readpos[1];
605 tape->first_frame = be32_to_cpup((__be32 *)&readpos[4]);
606 set_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags);
610 idetape_end_request(drive, uptodate, 0);
613 static void idetape_init_pc(struct ide_atapi_pc *pc)
615 memset(pc->c, 0, 12);
619 pc->buf = pc->pc_buf;
620 pc->buf_size = IDETAPE_PC_BUFFER_SIZE;
625 static void idetape_create_request_sense_cmd(struct ide_atapi_pc *pc)
628 pc->c[0] = REQUEST_SENSE;
634 * Generate a new packet command request in front of the request queue, before
635 * the current request, so that it will be processed immediately, on the next
636 * pass through the driver.
638 static void idetape_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
641 struct ide_tape_obj *tape = drive->driver_data;
643 blk_rq_init(NULL, rq);
644 rq->cmd_type = REQ_TYPE_SPECIAL;
645 rq->cmd_flags |= REQ_PREEMPT;
646 rq->buffer = (char *) pc;
647 rq->rq_disk = tape->disk;
648 memcpy(rq->cmd, pc->c, 12);
649 rq->cmd[13] = REQ_IDETAPE_PC1;
650 ide_do_drive_cmd(drive, rq);
654 * idetape_retry_pc is called when an error was detected during the
655 * last packet command. We queue a request sense packet command in
656 * the head of the request list.
658 static void idetape_retry_pc(ide_drive_t *drive)
660 struct ide_tape_obj *tape = drive->driver_data;
661 struct request *rq = &tape->request_sense_rq;
662 struct ide_atapi_pc *pc = &tape->request_sense_pc;
664 (void)ide_read_error(drive);
665 idetape_create_request_sense_cmd(pc);
666 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
667 idetape_queue_pc_head(drive, pc, rq);
671 * Postpone the current request so that ide.c will be able to service requests
672 * from another device on the same hwgroup while we are polling for DSC.
674 static void idetape_postpone_request(ide_drive_t *drive)
676 idetape_tape_t *tape = drive->driver_data;
678 debug_log(DBG_PROCS, "Enter %s\n", __func__);
680 tape->postponed_rq = HWGROUP(drive)->rq;
681 ide_stall_queue(drive, tape->dsc_poll_freq);
684 static void ide_tape_handle_dsc(ide_drive_t *drive)
686 idetape_tape_t *tape = drive->driver_data;
688 /* Media access command */
689 tape->dsc_polling_start = jiffies;
690 tape->dsc_poll_freq = IDETAPE_DSC_MA_FAST;
691 tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
692 /* Allow ide.c to handle other requests */
693 idetape_postpone_request(drive);
696 static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
697 unsigned int bcount, int write)
700 idetape_output_buffers(drive, pc, bcount);
702 idetape_input_buffers(drive, pc, bcount);
708 * This is the usual interrupt handler which will be called during a packet
709 * command. We will transfer some of the data (as requested by the drive) and
710 * will re-point interrupt handler to us. When data transfer is finished, we
711 * will act according to the algorithm described before
714 static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
716 idetape_tape_t *tape = drive->driver_data;
718 return ide_pc_intr(drive, tape->pc, idetape_pc_intr, IDETAPE_WAIT_CMD,
719 NULL, idetape_update_buffers, idetape_retry_pc,
720 ide_tape_handle_dsc, ide_tape_io_buffers);
724 * Packet Command Interface
726 * The current Packet Command is available in tape->pc, and will not change
727 * until we finish handling it. Each packet command is associated with a
728 * callback function that will be called when the command is finished.
730 * The handling will be done in three stages:
732 * 1. idetape_issue_pc will send the packet command to the drive, and will set
733 * the interrupt handler to idetape_pc_intr.
735 * 2. On each interrupt, idetape_pc_intr will be called. This step will be
736 * repeated until the device signals us that no more interrupts will be issued.
738 * 3. ATAPI Tape media access commands have immediate status with a delayed
739 * process. In case of a successful initiation of a media access packet command,
740 * the DSC bit will be set when the actual execution of the command is finished.
741 * Since the tape drive will not issue an interrupt, we have to poll for this
742 * event. In this case, we define the request as "low priority request" by
743 * setting rq_status to IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and
746 * ide.c will then give higher priority to requests which originate from the
747 * other device, until will change rq_status to RQ_ACTIVE.
749 * 4. When the packet command is finished, it will be checked for errors.
751 * 5. In case an error was found, we queue a request sense packet command in
752 * front of the request queue and retry the operation up to
753 * IDETAPE_MAX_PC_RETRIES times.
755 * 6. In case no error was found, or we decided to give up and not to retry
756 * again, the callback function will be called and then we will handle the next
759 static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
761 idetape_tape_t *tape = drive->driver_data;
763 return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
764 IDETAPE_WAIT_CMD, NULL);
767 static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
768 struct ide_atapi_pc *pc)
770 idetape_tape_t *tape = drive->driver_data;
772 if (tape->pc->c[0] == REQUEST_SENSE &&
773 pc->c[0] == REQUEST_SENSE) {
774 printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
775 "Two request sense in serial were issued\n");
778 if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
779 tape->failed_pc = pc;
780 /* Set the current packet command */
783 if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
784 (pc->flags & PC_FLAG_ABORT)) {
786 * We will "abort" retrying a packet command in case legitimate
787 * error code was received (crossing a filemark, or end of the
788 * media, for example).
790 if (!(pc->flags & PC_FLAG_ABORT)) {
791 if (!(pc->c[0] == TEST_UNIT_READY &&
792 tape->sense_key == 2 && tape->asc == 4 &&
793 (tape->ascq == 1 || tape->ascq == 8))) {
794 printk(KERN_ERR "ide-tape: %s: I/O error, "
795 "pc = %2x, key = %2x, "
796 "asc = %2x, ascq = %2x\n",
797 tape->name, pc->c[0],
798 tape->sense_key, tape->asc,
802 pc->error = IDETAPE_ERROR_GENERAL;
804 tape->failed_pc = NULL;
805 drive->pc_callback(drive);
808 debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
812 return ide_issue_pc(drive, pc, idetape_transfer_pc,
813 IDETAPE_WAIT_CMD, NULL);
816 /* A mode sense command is used to "sense" tape parameters. */
817 static void idetape_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
820 pc->c[0] = MODE_SENSE;
821 if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
822 /* DBD = 1 - Don't return block descriptors */
824 pc->c[2] = page_code;
826 * Changed pc->c[3] to 0 (255 will at best return unused info).
828 * For SCSI this byte is defined as subpage instead of high byte
829 * of length and some IDE drives seem to interpret it this way
830 * and return an error when 255 is used.
833 /* We will just discard data in that case */
835 if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
837 else if (page_code == IDETAPE_CAPABILITIES_PAGE)
843 static ide_startstop_t idetape_media_access_finished(ide_drive_t *drive)
845 ide_hwif_t *hwif = drive->hwif;
846 idetape_tape_t *tape = drive->driver_data;
847 struct ide_atapi_pc *pc = tape->pc;
850 stat = hwif->tp_ops->read_status(hwif);
852 if (stat & ATA_DSC) {
853 if (stat & ATA_ERR) {
855 if (pc->c[0] != TEST_UNIT_READY)
856 printk(KERN_ERR "ide-tape: %s: I/O error, ",
858 /* Retry operation */
859 idetape_retry_pc(drive);
864 pc->error = IDETAPE_ERROR_GENERAL;
865 tape->failed_pc = NULL;
867 drive->pc_callback(drive);
871 static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
872 struct ide_atapi_pc *pc, struct request *rq,
875 struct idetape_bh *bh = (struct idetape_bh *)rq->special;
876 unsigned int length = rq->current_nr_sectors;
879 put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
883 pc->buf_size = length * tape->blk_size;
884 pc->req_xfer = pc->buf_size;
885 if (pc->req_xfer == tape->buffer_size)
886 pc->flags |= PC_FLAG_DMA_OK;
888 if (opcode == READ_6) {
890 atomic_set(&bh->b_count, 0);
891 } else if (opcode == WRITE_6) {
893 pc->flags |= PC_FLAG_WRITING;
894 pc->b_data = bh->b_data;
895 pc->b_count = atomic_read(&bh->b_count);
898 memcpy(rq->cmd, pc->c, 12);
901 static ide_startstop_t idetape_do_request(ide_drive_t *drive,
902 struct request *rq, sector_t block)
904 ide_hwif_t *hwif = drive->hwif;
905 idetape_tape_t *tape = drive->driver_data;
906 struct ide_atapi_pc *pc = NULL;
907 struct request *postponed_rq = tape->postponed_rq;
910 debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
911 " current_nr_sectors: %u\n",
912 (unsigned long long)rq->sector, rq->nr_sectors,
913 rq->current_nr_sectors);
915 if (!blk_special_request(rq)) {
916 /* We do not support buffer cache originated requests. */
917 printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
918 "request queue (%d)\n", drive->name, rq->cmd_type);
919 ide_end_request(drive, 0, 0);
923 /* Retry a failed packet command */
924 if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
925 pc = tape->failed_pc;
929 if (postponed_rq != NULL)
930 if (rq != postponed_rq) {
931 printk(KERN_ERR "ide-tape: ide-tape.c bug - "
932 "Two DSC requests were queued\n");
933 idetape_end_request(drive, 0, 0);
937 tape->postponed_rq = NULL;
940 * If the tape is still busy, postpone our request and service
941 * the other device meanwhile.
943 stat = hwif->tp_ops->read_status(hwif);
945 if (!drive->dsc_overlap && !(rq->cmd[13] & REQ_IDETAPE_PC2))
946 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
948 if (drive->post_reset == 1) {
949 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
950 drive->post_reset = 0;
953 if (!test_and_clear_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags) &&
954 (stat & ATA_DSC) == 0) {
955 if (postponed_rq == NULL) {
956 tape->dsc_polling_start = jiffies;
957 tape->dsc_poll_freq = tape->best_dsc_rw_freq;
958 tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
959 } else if (time_after(jiffies, tape->dsc_timeout)) {
960 printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
962 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
963 idetape_media_access_finished(drive);
966 return ide_do_reset(drive);
968 } else if (time_after(jiffies,
969 tape->dsc_polling_start +
970 IDETAPE_DSC_MA_THRESHOLD))
971 tape->dsc_poll_freq = IDETAPE_DSC_MA_SLOW;
972 idetape_postpone_request(drive);
975 if (rq->cmd[13] & REQ_IDETAPE_READ) {
976 pc = &tape->queued_pc;
977 ide_tape_create_rw_cmd(tape, pc, rq, READ_6);
980 if (rq->cmd[13] & REQ_IDETAPE_WRITE) {
981 pc = &tape->queued_pc;
982 ide_tape_create_rw_cmd(tape, pc, rq, WRITE_6);
985 if (rq->cmd[13] & REQ_IDETAPE_PC1) {
986 pc = (struct ide_atapi_pc *) rq->buffer;
987 rq->cmd[13] &= ~(REQ_IDETAPE_PC1);
988 rq->cmd[13] |= REQ_IDETAPE_PC2;
991 if (rq->cmd[13] & REQ_IDETAPE_PC2) {
992 idetape_media_access_finished(drive);
998 return idetape_issue_pc(drive, pc);
1002 * The function below uses __get_free_pages to allocate a data buffer of size
1003 * tape->buffer_size (or a bit more). We attempt to combine sequential pages as
1006 * It returns a pointer to the newly allocated buffer, or NULL in case of
1009 static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
1010 int full, int clear)
1012 struct idetape_bh *prev_bh, *bh, *merge_bh;
1013 int pages = tape->pages_per_buffer;
1014 unsigned int order, b_allocd;
1015 char *b_data = NULL;
1017 merge_bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1022 order = fls(pages) - 1;
1023 bh->b_data = (char *) __get_free_pages(GFP_KERNEL, order);
1026 b_allocd = (1 << order) * PAGE_SIZE;
1030 memset(bh->b_data, 0, b_allocd);
1031 bh->b_reqnext = NULL;
1032 bh->b_size = b_allocd;
1033 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1036 order = fls(pages) - 1;
1037 b_data = (char *) __get_free_pages(GFP_KERNEL, order);
1040 b_allocd = (1 << order) * PAGE_SIZE;
1043 memset(b_data, 0, b_allocd);
1045 /* newly allocated page frames below buffer header or ...*/
1046 if (bh->b_data == b_data + b_allocd) {
1047 bh->b_size += b_allocd;
1048 bh->b_data -= b_allocd;
1050 atomic_add(b_allocd, &bh->b_count);
1053 /* they are above the header */
1054 if (b_data == bh->b_data + bh->b_size) {
1055 bh->b_size += b_allocd;
1057 atomic_add(b_allocd, &bh->b_count);
1061 bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
1063 free_pages((unsigned long) b_data, order);
1066 bh->b_reqnext = NULL;
1067 bh->b_data = b_data;
1068 bh->b_size = b_allocd;
1069 atomic_set(&bh->b_count, full ? bh->b_size : 0);
1070 prev_bh->b_reqnext = bh;
1075 bh->b_size -= tape->excess_bh_size;
1077 atomic_sub(tape->excess_bh_size, &bh->b_count);
1080 ide_tape_kfree_buffer(tape);
1084 static int idetape_copy_stage_from_user(idetape_tape_t *tape,
1085 const char __user *buf, int n)
1087 struct idetape_bh *bh = tape->bh;
1093 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1097 count = min((unsigned int)
1098 (bh->b_size - atomic_read(&bh->b_count)),
1100 if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
1104 atomic_add(count, &bh->b_count);
1106 if (atomic_read(&bh->b_count) == bh->b_size) {
1109 atomic_set(&bh->b_count, 0);
1116 static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
1119 struct idetape_bh *bh = tape->bh;
1125 printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
1129 count = min(tape->b_count, n);
1130 if (copy_to_user(buf, tape->b_data, count))
1133 tape->b_data += count;
1134 tape->b_count -= count;
1136 if (!tape->b_count) {
1140 tape->b_data = bh->b_data;
1141 tape->b_count = atomic_read(&bh->b_count);
1148 static void idetape_init_merge_buffer(idetape_tape_t *tape)
1150 struct idetape_bh *bh = tape->merge_bh;
1151 tape->bh = tape->merge_bh;
1153 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
1154 atomic_set(&bh->b_count, 0);
1156 tape->b_data = bh->b_data;
1157 tape->b_count = atomic_read(&bh->b_count);
1162 * Write a filemark if write_filemark=1. Flush the device buffers without
1163 * writing a filemark otherwise.
1165 static void idetape_create_write_filemark_cmd(ide_drive_t *drive,
1166 struct ide_atapi_pc *pc, int write_filemark)
1168 idetape_init_pc(pc);
1169 pc->c[0] = WRITE_FILEMARKS;
1170 pc->c[4] = write_filemark;
1171 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1174 static void idetape_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
1176 idetape_init_pc(pc);
1177 pc->c[0] = TEST_UNIT_READY;
1181 * We add a special packet command request to the tail of the request queue, and
1182 * wait for it to be serviced.
1184 static int idetape_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
1186 struct ide_tape_obj *tape = drive->driver_data;
1190 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1191 rq->cmd_type = REQ_TYPE_SPECIAL;
1192 rq->cmd[13] = REQ_IDETAPE_PC1;
1193 rq->buffer = (char *)pc;
1194 memcpy(rq->cmd, pc->c, 12);
1195 error = blk_execute_rq(drive->queue, tape->disk, rq, 0);
1196 blk_put_request(rq);
1200 static void idetape_create_load_unload_cmd(ide_drive_t *drive,
1201 struct ide_atapi_pc *pc, int cmd)
1203 idetape_init_pc(pc);
1204 pc->c[0] = START_STOP;
1206 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1209 static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
1211 idetape_tape_t *tape = drive->driver_data;
1212 struct ide_atapi_pc pc;
1213 int load_attempted = 0;
1215 /* Wait for the tape to become ready */
1216 set_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1218 while (time_before(jiffies, timeout)) {
1219 idetape_create_test_unit_ready_cmd(&pc);
1220 if (!idetape_queue_pc_tail(drive, &pc))
1222 if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
1223 || (tape->asc == 0x3A)) {
1227 idetape_create_load_unload_cmd(drive, &pc,
1228 IDETAPE_LU_LOAD_MASK);
1229 idetape_queue_pc_tail(drive, &pc);
1231 /* not about to be ready */
1232 } else if (!(tape->sense_key == 2 && tape->asc == 4 &&
1233 (tape->ascq == 1 || tape->ascq == 8)))
1240 static int idetape_flush_tape_buffers(ide_drive_t *drive)
1242 struct ide_atapi_pc pc;
1245 idetape_create_write_filemark_cmd(drive, &pc, 0);
1246 rc = idetape_queue_pc_tail(drive, &pc);
1249 idetape_wait_ready(drive, 60 * 5 * HZ);
1253 static void idetape_create_read_position_cmd(struct ide_atapi_pc *pc)
1255 idetape_init_pc(pc);
1256 pc->c[0] = READ_POSITION;
1260 static int idetape_read_position(ide_drive_t *drive)
1262 idetape_tape_t *tape = drive->driver_data;
1263 struct ide_atapi_pc pc;
1266 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1268 idetape_create_read_position_cmd(&pc);
1269 if (idetape_queue_pc_tail(drive, &pc))
1271 position = tape->first_frame;
1275 static void idetape_create_locate_cmd(ide_drive_t *drive,
1276 struct ide_atapi_pc *pc,
1277 unsigned int block, u8 partition, int skip)
1279 idetape_init_pc(pc);
1280 pc->c[0] = POSITION_TO_ELEMENT;
1282 put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
1283 pc->c[8] = partition;
1284 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1287 static int idetape_create_prevent_cmd(ide_drive_t *drive,
1288 struct ide_atapi_pc *pc, int prevent)
1290 idetape_tape_t *tape = drive->driver_data;
1292 /* device supports locking according to capabilities page */
1293 if (!(tape->caps[6] & 0x01))
1296 idetape_init_pc(pc);
1297 pc->c[0] = ALLOW_MEDIUM_REMOVAL;
1302 static int ide_tape_set_media_lock(ide_drive_t *drive, int on)
1304 struct ide_atapi_pc pc;
1306 if (!idetape_create_prevent_cmd(drive, &pc, on))
1309 return idetape_queue_pc_tail(drive, &pc);
1312 static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
1314 idetape_tape_t *tape = drive->driver_data;
1316 if (tape->chrdev_dir != IDETAPE_DIR_READ)
1319 clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
1320 tape->merge_bh_size = 0;
1321 if (tape->merge_bh != NULL) {
1322 ide_tape_kfree_buffer(tape);
1323 tape->merge_bh = NULL;
1326 tape->chrdev_dir = IDETAPE_DIR_NONE;
1330 * Position the tape to the requested block using the LOCATE packet command.
1331 * A READ POSITION command is then issued to check where we are positioned. Like
1332 * all higher level operations, we queue the commands at the tail of the request
1333 * queue and wait for their completion.
1335 static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
1336 u8 partition, int skip)
1338 idetape_tape_t *tape = drive->driver_data;
1340 struct ide_atapi_pc pc;
1342 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1343 __ide_tape_discard_merge_buffer(drive);
1344 idetape_wait_ready(drive, 60 * 5 * HZ);
1345 idetape_create_locate_cmd(drive, &pc, block, partition, skip);
1346 retval = idetape_queue_pc_tail(drive, &pc);
1350 idetape_create_read_position_cmd(&pc);
1351 return (idetape_queue_pc_tail(drive, &pc));
1354 static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
1355 int restore_position)
1357 idetape_tape_t *tape = drive->driver_data;
1360 __ide_tape_discard_merge_buffer(drive);
1361 if (restore_position) {
1362 position = idetape_read_position(drive);
1363 seek = position > 0 ? position : 0;
1364 if (idetape_position_tape(drive, seek, 0, 0)) {
1365 printk(KERN_INFO "ide-tape: %s: position_tape failed in"
1366 " %s\n", tape->name, __func__);
1373 * Generate a read/write request for the block device interface and wait for it
1376 static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
1377 struct idetape_bh *bh)
1379 idetape_tape_t *tape = drive->driver_data;
1383 debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
1385 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
1386 rq->cmd_type = REQ_TYPE_SPECIAL;
1388 rq->rq_disk = tape->disk;
1389 rq->special = (void *)bh;
1390 rq->sector = tape->first_frame;
1391 rq->nr_sectors = blocks;
1392 rq->current_nr_sectors = blocks;
1393 blk_execute_rq(drive->queue, tape->disk, rq, 0);
1395 errors = rq->errors;
1396 ret = tape->blk_size * (blocks - rq->current_nr_sectors);
1397 blk_put_request(rq);
1399 if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
1403 idetape_init_merge_buffer(tape);
1404 if (errors == IDETAPE_ERROR_GENERAL)
1409 static void idetape_create_inquiry_cmd(struct ide_atapi_pc *pc)
1411 idetape_init_pc(pc);
1417 static void idetape_create_rewind_cmd(ide_drive_t *drive,
1418 struct ide_atapi_pc *pc)
1420 idetape_init_pc(pc);
1421 pc->c[0] = REZERO_UNIT;
1422 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1425 static void idetape_create_erase_cmd(struct ide_atapi_pc *pc)
1427 idetape_init_pc(pc);
1430 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1433 static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
1435 idetape_init_pc(pc);
1437 put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
1439 pc->flags |= PC_FLAG_WAIT_FOR_DSC;
1442 /* Queue up a character device originated write request. */
1443 static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
1445 idetape_tape_t *tape = drive->driver_data;
1447 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
1449 return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
1450 blocks, tape->merge_bh);
1453 static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
1455 idetape_tape_t *tape = drive->driver_data;
1457 struct idetape_bh *bh;
1459 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1460 printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
1461 " but we are not writing.\n");
1464 if (tape->merge_bh_size > tape->buffer_size) {
1465 printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
1466 tape->merge_bh_size = tape->buffer_size;
1468 if (tape->merge_bh_size) {
1469 blocks = tape->merge_bh_size / tape->blk_size;
1470 if (tape->merge_bh_size % tape->blk_size) {
1474 i = tape->blk_size - tape->merge_bh_size %
1476 bh = tape->bh->b_reqnext;
1478 atomic_set(&bh->b_count, 0);
1484 printk(KERN_INFO "ide-tape: bug,"
1488 min = min(i, (unsigned int)(bh->b_size -
1489 atomic_read(&bh->b_count)));
1490 memset(bh->b_data + atomic_read(&bh->b_count),
1492 atomic_add(min, &bh->b_count);
1497 (void) idetape_add_chrdev_write_request(drive, blocks);
1498 tape->merge_bh_size = 0;
1500 if (tape->merge_bh != NULL) {
1501 ide_tape_kfree_buffer(tape);
1502 tape->merge_bh = NULL;
1504 tape->chrdev_dir = IDETAPE_DIR_NONE;
1507 static int idetape_init_read(ide_drive_t *drive)
1509 idetape_tape_t *tape = drive->driver_data;
1512 /* Initialize read operation */
1513 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1514 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
1515 ide_tape_flush_merge_buffer(drive);
1516 idetape_flush_tape_buffers(drive);
1518 if (tape->merge_bh || tape->merge_bh_size) {
1519 printk(KERN_ERR "ide-tape: merge_bh_size should be"
1521 tape->merge_bh_size = 0;
1523 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1524 if (!tape->merge_bh)
1526 tape->chrdev_dir = IDETAPE_DIR_READ;
1529 * Issue a read 0 command to ensure that DSC handshake is
1530 * switched from completion mode to buffer available mode.
1531 * No point in issuing this if DSC overlap isn't supported, some
1532 * drives (Seagate STT3401A) will return an error.
1534 if (drive->dsc_overlap) {
1535 bytes_read = idetape_queue_rw_tail(drive,
1536 REQ_IDETAPE_READ, 0,
1538 if (bytes_read < 0) {
1539 ide_tape_kfree_buffer(tape);
1540 tape->merge_bh = NULL;
1541 tape->chrdev_dir = IDETAPE_DIR_NONE;
1550 /* called from idetape_chrdev_read() to service a chrdev read request. */
1551 static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
1553 idetape_tape_t *tape = drive->driver_data;
1555 debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
1557 /* If we are at a filemark, return a read length of 0 */
1558 if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1561 idetape_init_read(drive);
1563 return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
1567 static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
1569 idetape_tape_t *tape = drive->driver_data;
1570 struct idetape_bh *bh;
1576 bh = tape->merge_bh;
1577 count = min(tape->buffer_size, bcount);
1579 blocks = count / tape->blk_size;
1581 atomic_set(&bh->b_count,
1582 min(count, (unsigned int)bh->b_size));
1583 memset(bh->b_data, 0, atomic_read(&bh->b_count));
1584 count -= atomic_read(&bh->b_count);
1587 idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
1593 * Rewinds the tape to the Beginning Of the current Partition (BOP). We
1594 * currently support only one partition.
1596 static int idetape_rewind_tape(ide_drive_t *drive)
1599 struct ide_atapi_pc pc;
1600 idetape_tape_t *tape;
1601 tape = drive->driver_data;
1603 debug_log(DBG_SENSE, "Enter %s\n", __func__);
1605 idetape_create_rewind_cmd(drive, &pc);
1606 retval = idetape_queue_pc_tail(drive, &pc);
1610 idetape_create_read_position_cmd(&pc);
1611 retval = idetape_queue_pc_tail(drive, &pc);
1617 /* mtio.h compatible commands should be issued to the chrdev interface. */
1618 static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd,
1621 idetape_tape_t *tape = drive->driver_data;
1622 void __user *argp = (void __user *)arg;
1624 struct idetape_config {
1625 int dsc_rw_frequency;
1626 int dsc_media_access_frequency;
1630 debug_log(DBG_PROCS, "Enter %s\n", __func__);
1634 if (copy_from_user(&config, argp, sizeof(config)))
1636 tape->best_dsc_rw_freq = config.dsc_rw_frequency;
1639 config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
1640 config.nr_stages = 1;
1641 if (copy_to_user(argp, &config, sizeof(config)))
1650 static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
1653 idetape_tape_t *tape = drive->driver_data;
1654 struct ide_atapi_pc pc;
1655 int retval, count = 0;
1656 int sprev = !!(tape->caps[4] & 0x20);
1660 if (MTBSF == mt_op || MTBSFM == mt_op) {
1663 mt_count = -mt_count;
1666 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
1667 tape->merge_bh_size = 0;
1668 if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
1670 ide_tape_discard_merge_buffer(drive, 0);
1676 idetape_create_space_cmd(&pc, mt_count - count,
1677 IDETAPE_SPACE_OVER_FILEMARK);
1678 return idetape_queue_pc_tail(drive, &pc);
1683 retval = idetape_space_over_filemarks(drive, MTFSF,
1687 count = (MTBSFM == mt_op ? 1 : -1);
1688 return idetape_space_over_filemarks(drive, MTFSF, count);
1690 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
1697 * Our character device read / write functions.
1699 * The tape is optimized to maximize throughput when it is transferring an
1700 * integral number of the "continuous transfer limit", which is a parameter of
1701 * the specific tape (26kB on my particular tape, 32kB for Onstream).
1703 * As of version 1.3 of the driver, the character device provides an abstract
1704 * continuous view of the media - any mix of block sizes (even 1 byte) on the
1705 * same backup/restore procedure is supported. The driver will internally
1706 * convert the requests to the recommended transfer unit, so that an unmatch
1707 * between the user's block size to the recommended size will only result in a
1708 * (slightly) increased driver overhead, but will no longer hit performance.
1709 * This is not applicable to Onstream.
1711 static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
1712 size_t count, loff_t *ppos)
1714 struct ide_tape_obj *tape = ide_tape_f(file);
1715 ide_drive_t *drive = tape->drive;
1716 ssize_t bytes_read, temp, actually_read = 0, rc;
1718 u16 ctl = *(u16 *)&tape->caps[12];
1720 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1722 if (tape->chrdev_dir != IDETAPE_DIR_READ) {
1723 if (test_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags))
1724 if (count > tape->blk_size &&
1725 (count % tape->blk_size) == 0)
1726 tape->user_bs_factor = count / tape->blk_size;
1728 rc = idetape_init_read(drive);
1733 if (tape->merge_bh_size) {
1734 actually_read = min((unsigned int)(tape->merge_bh_size),
1735 (unsigned int)count);
1736 if (idetape_copy_stage_to_user(tape, buf, actually_read))
1738 buf += actually_read;
1739 tape->merge_bh_size -= actually_read;
1740 count -= actually_read;
1742 while (count >= tape->buffer_size) {
1743 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1744 if (bytes_read <= 0)
1746 if (idetape_copy_stage_to_user(tape, buf, bytes_read))
1749 count -= bytes_read;
1750 actually_read += bytes_read;
1753 bytes_read = idetape_add_chrdev_read_request(drive, ctl);
1754 if (bytes_read <= 0)
1756 temp = min((unsigned long)count, (unsigned long)bytes_read);
1757 if (idetape_copy_stage_to_user(tape, buf, temp))
1759 actually_read += temp;
1760 tape->merge_bh_size = bytes_read-temp;
1763 if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
1764 debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
1766 idetape_space_over_filemarks(drive, MTFSF, 1);
1770 return ret ? ret : actually_read;
1773 static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
1774 size_t count, loff_t *ppos)
1776 struct ide_tape_obj *tape = ide_tape_f(file);
1777 ide_drive_t *drive = tape->drive;
1778 ssize_t actually_written = 0;
1780 u16 ctl = *(u16 *)&tape->caps[12];
1782 /* The drive is write protected. */
1783 if (tape->write_prot)
1786 debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
1788 /* Initialize write operation */
1789 if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
1790 if (tape->chrdev_dir == IDETAPE_DIR_READ)
1791 ide_tape_discard_merge_buffer(drive, 1);
1792 if (tape->merge_bh || tape->merge_bh_size) {
1793 printk(KERN_ERR "ide-tape: merge_bh_size "
1794 "should be 0 now\n");
1795 tape->merge_bh_size = 0;
1797 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0, 0);
1798 if (!tape->merge_bh)
1800 tape->chrdev_dir = IDETAPE_DIR_WRITE;
1801 idetape_init_merge_buffer(tape);
1804 * Issue a write 0 command to ensure that DSC handshake is
1805 * switched from completion mode to buffer available mode. No
1806 * point in issuing this if DSC overlap isn't supported, some
1807 * drives (Seagate STT3401A) will return an error.
1809 if (drive->dsc_overlap) {
1810 ssize_t retval = idetape_queue_rw_tail(drive,
1811 REQ_IDETAPE_WRITE, 0,
1814 ide_tape_kfree_buffer(tape);
1815 tape->merge_bh = NULL;
1816 tape->chrdev_dir = IDETAPE_DIR_NONE;
1823 if (tape->merge_bh_size) {
1824 if (tape->merge_bh_size >= tape->buffer_size) {
1825 printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
1826 tape->merge_bh_size = 0;
1828 actually_written = min((unsigned int)
1829 (tape->buffer_size - tape->merge_bh_size),
1830 (unsigned int)count);
1831 if (idetape_copy_stage_from_user(tape, buf, actually_written))
1833 buf += actually_written;
1834 tape->merge_bh_size += actually_written;
1835 count -= actually_written;
1837 if (tape->merge_bh_size == tape->buffer_size) {
1839 tape->merge_bh_size = 0;
1840 retval = idetape_add_chrdev_write_request(drive, ctl);
1845 while (count >= tape->buffer_size) {
1847 if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
1849 buf += tape->buffer_size;
1850 count -= tape->buffer_size;
1851 retval = idetape_add_chrdev_write_request(drive, ctl);
1852 actually_written += tape->buffer_size;
1857 actually_written += count;
1858 if (idetape_copy_stage_from_user(tape, buf, count))
1860 tape->merge_bh_size += count;
1862 return ret ? ret : actually_written;
1865 static int idetape_write_filemark(ide_drive_t *drive)
1867 struct ide_atapi_pc pc;
1869 /* Write a filemark */
1870 idetape_create_write_filemark_cmd(drive, &pc, 1);
1871 if (idetape_queue_pc_tail(drive, &pc)) {
1872 printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
1879 * Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
1882 * Note: MTBSF and MTBSFM are not supported when the tape doesn't support
1883 * spacing over filemarks in the reverse direction. In this case, MTFSFM is also
1884 * usually not supported.
1886 * The following commands are currently not supported:
1888 * MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
1889 * MT_ST_WRITE_THRESHOLD.
1891 static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
1893 idetape_tape_t *tape = drive->driver_data;
1894 struct ide_atapi_pc pc;
1897 debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
1907 return idetape_space_over_filemarks(drive, mt_op, mt_count);
1914 if (tape->write_prot)
1916 ide_tape_discard_merge_buffer(drive, 1);
1917 for (i = 0; i < mt_count; i++) {
1918 retval = idetape_write_filemark(drive);
1924 ide_tape_discard_merge_buffer(drive, 0);
1925 if (idetape_rewind_tape(drive))
1929 ide_tape_discard_merge_buffer(drive, 0);
1930 idetape_create_load_unload_cmd(drive, &pc,
1931 IDETAPE_LU_LOAD_MASK);
1932 return idetape_queue_pc_tail(drive, &pc);
1936 * If door is locked, attempt to unlock before
1937 * attempting to eject.
1939 if (tape->door_locked) {
1940 if (!ide_tape_set_media_lock(drive, 0))
1941 tape->door_locked = DOOR_UNLOCKED;
1943 ide_tape_discard_merge_buffer(drive, 0);
1944 idetape_create_load_unload_cmd(drive, &pc,
1945 !IDETAPE_LU_LOAD_MASK);
1946 retval = idetape_queue_pc_tail(drive, &pc);
1948 clear_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags);
1951 ide_tape_discard_merge_buffer(drive, 0);
1952 return idetape_flush_tape_buffers(drive);
1954 ide_tape_discard_merge_buffer(drive, 0);
1955 idetape_create_load_unload_cmd(drive, &pc,
1956 IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
1957 return idetape_queue_pc_tail(drive, &pc);
1959 idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
1960 return idetape_queue_pc_tail(drive, &pc);
1962 (void)idetape_rewind_tape(drive);
1963 idetape_create_erase_cmd(&pc);
1964 return idetape_queue_pc_tail(drive, &pc);
1967 if (mt_count < tape->blk_size ||
1968 mt_count % tape->blk_size)
1970 tape->user_bs_factor = mt_count / tape->blk_size;
1971 clear_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1973 set_bit(IDE_AFLAG_DETECT_BS, &drive->atapi_flags);
1976 ide_tape_discard_merge_buffer(drive, 0);
1977 return idetape_position_tape(drive,
1978 mt_count * tape->user_bs_factor, tape->partition, 0);
1980 ide_tape_discard_merge_buffer(drive, 0);
1981 return idetape_position_tape(drive, 0, mt_count, 0);
1985 retval = ide_tape_set_media_lock(drive, 1);
1988 tape->door_locked = DOOR_EXPLICITLY_LOCKED;
1991 retval = ide_tape_set_media_lock(drive, 0);
1994 tape->door_locked = DOOR_UNLOCKED;
1997 printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",
2004 * Our character device ioctls. General mtio.h magnetic io commands are
2005 * supported here, and not in the corresponding block interface. Our own
2006 * ide-tape ioctls are supported on both interfaces.
2008 static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
2009 unsigned int cmd, unsigned long arg)
2011 struct ide_tape_obj *tape = ide_tape_f(file);
2012 ide_drive_t *drive = tape->drive;
2016 int block_offset = 0, position = tape->first_frame;
2017 void __user *argp = (void __user *)arg;
2019 debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
2021 if (tape->chrdev_dir == IDETAPE_DIR_WRITE) {
2022 ide_tape_flush_merge_buffer(drive);
2023 idetape_flush_tape_buffers(drive);
2025 if (cmd == MTIOCGET || cmd == MTIOCPOS) {
2026 block_offset = tape->merge_bh_size /
2027 (tape->blk_size * tape->user_bs_factor);
2028 position = idetape_read_position(drive);
2034 if (copy_from_user(&mtop, argp, sizeof(struct mtop)))
2036 return idetape_mtioctop(drive, mtop.mt_op, mtop.mt_count);
2038 memset(&mtget, 0, sizeof(struct mtget));
2039 mtget.mt_type = MT_ISSCSI2;
2040 mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
2042 ((tape->blk_size * tape->user_bs_factor)
2043 << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
2045 if (tape->drv_write_prot)
2046 mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
2048 if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
2052 mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
2053 if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
2057 if (tape->chrdev_dir == IDETAPE_DIR_READ)
2058 ide_tape_discard_merge_buffer(drive, 1);
2059 return idetape_blkdev_ioctl(drive, cmd, arg);
2064 * Do a mode sense page 0 with block descriptor and if it succeeds set the tape
2065 * block size with the reported value.
2067 static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
2069 idetape_tape_t *tape = drive->driver_data;
2070 struct ide_atapi_pc pc;
2072 idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
2073 if (idetape_queue_pc_tail(drive, &pc)) {
2074 printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
2075 if (tape->blk_size == 0) {
2076 printk(KERN_WARNING "ide-tape: Cannot deal with zero "
2077 "block size, assuming 32k\n");
2078 tape->blk_size = 32768;
2082 tape->blk_size = (pc.buf[4 + 5] << 16) +
2083 (pc.buf[4 + 6] << 8) +
2085 tape->drv_write_prot = (pc.buf[2] & 0x80) >> 7;
2088 static int idetape_chrdev_open(struct inode *inode, struct file *filp)
2090 unsigned int minor = iminor(inode), i = minor & ~0xc0;
2092 idetape_tape_t *tape;
2095 if (i >= MAX_HWIFS * MAX_DRIVES)
2099 tape = ide_tape_chrdev_get(i);
2105 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2108 * We really want to do nonseekable_open(inode, filp); here, but some
2109 * versions of tar incorrectly call lseek on tapes and bail out if that
2110 * fails. So we disallow pread() and pwrite(), but permit lseeks.
2112 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
2114 drive = tape->drive;
2116 filp->private_data = tape;
2118 if (test_and_set_bit(IDE_AFLAG_BUSY, &drive->atapi_flags)) {
2123 retval = idetape_wait_ready(drive, 60 * HZ);
2125 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2126 printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
2130 idetape_read_position(drive);
2131 if (!test_bit(IDE_AFLAG_ADDRESS_VALID, &drive->atapi_flags))
2132 (void)idetape_rewind_tape(drive);
2134 /* Read block size and write protect status from drive. */
2135 ide_tape_get_bsize_from_bdesc(drive);
2137 /* Set write protect flag if device is opened as read-only. */
2138 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
2139 tape->write_prot = 1;
2141 tape->write_prot = tape->drv_write_prot;
2143 /* Make sure drive isn't write protected if user wants to write. */
2144 if (tape->write_prot) {
2145 if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
2146 (filp->f_flags & O_ACCMODE) == O_RDWR) {
2147 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2153 /* Lock the tape drive door so user can't eject. */
2154 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2155 if (!ide_tape_set_media_lock(drive, 1)) {
2156 if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
2157 tape->door_locked = DOOR_LOCKED;
2169 static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
2171 idetape_tape_t *tape = drive->driver_data;
2173 ide_tape_flush_merge_buffer(drive);
2174 tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1, 0);
2175 if (tape->merge_bh != NULL) {
2176 idetape_pad_zeros(drive, tape->blk_size *
2177 (tape->user_bs_factor - 1));
2178 ide_tape_kfree_buffer(tape);
2179 tape->merge_bh = NULL;
2181 idetape_write_filemark(drive);
2182 idetape_flush_tape_buffers(drive);
2183 idetape_flush_tape_buffers(drive);
2186 static int idetape_chrdev_release(struct inode *inode, struct file *filp)
2188 struct ide_tape_obj *tape = ide_tape_f(filp);
2189 ide_drive_t *drive = tape->drive;
2190 unsigned int minor = iminor(inode);
2193 tape = drive->driver_data;
2195 debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
2197 if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
2198 idetape_write_release(drive, minor);
2199 if (tape->chrdev_dir == IDETAPE_DIR_READ) {
2201 ide_tape_discard_merge_buffer(drive, 1);
2204 if (minor < 128 && test_bit(IDE_AFLAG_MEDIUM_PRESENT, &drive->atapi_flags))
2205 (void) idetape_rewind_tape(drive);
2206 if (tape->chrdev_dir == IDETAPE_DIR_NONE) {
2207 if (tape->door_locked == DOOR_LOCKED) {
2208 if (!ide_tape_set_media_lock(drive, 0))
2209 tape->door_locked = DOOR_UNLOCKED;
2212 clear_bit(IDE_AFLAG_BUSY, &drive->atapi_flags);
2218 static void idetape_get_inquiry_results(ide_drive_t *drive)
2220 idetape_tape_t *tape = drive->driver_data;
2221 struct ide_atapi_pc pc;
2222 char fw_rev[4], vendor_id[8], product_id[16];
2224 idetape_create_inquiry_cmd(&pc);
2225 if (idetape_queue_pc_tail(drive, &pc)) {
2226 printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
2230 memcpy(vendor_id, &pc.buf[8], 8);
2231 memcpy(product_id, &pc.buf[16], 16);
2232 memcpy(fw_rev, &pc.buf[32], 4);
2234 ide_fixstring(vendor_id, 8, 0);
2235 ide_fixstring(product_id, 16, 0);
2236 ide_fixstring(fw_rev, 4, 0);
2238 printk(KERN_INFO "ide-tape: %s <-> %s: %.8s %.16s rev %.4s\n",
2239 drive->name, tape->name, vendor_id, product_id, fw_rev);
2243 * Ask the tape about its various parameters. In particular, we will adjust our
2244 * data transfer buffer size to the recommended value as returned by the tape.
2246 static void idetape_get_mode_sense_results(ide_drive_t *drive)
2248 idetape_tape_t *tape = drive->driver_data;
2249 struct ide_atapi_pc pc;
2251 u8 speed, max_speed;
2253 idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
2254 if (idetape_queue_pc_tail(drive, &pc)) {
2255 printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
2256 " some default values\n");
2257 tape->blk_size = 512;
2258 put_unaligned(52, (u16 *)&tape->caps[12]);
2259 put_unaligned(540, (u16 *)&tape->caps[14]);
2260 put_unaligned(6*52, (u16 *)&tape->caps[16]);
2263 caps = pc.buf + 4 + pc.buf[3];
2265 /* convert to host order and save for later use */
2266 speed = be16_to_cpup((__be16 *)&caps[14]);
2267 max_speed = be16_to_cpup((__be16 *)&caps[8]);
2269 *(u16 *)&caps[8] = max_speed;
2270 *(u16 *)&caps[12] = be16_to_cpup((__be16 *)&caps[12]);
2271 *(u16 *)&caps[14] = speed;
2272 *(u16 *)&caps[16] = be16_to_cpup((__be16 *)&caps[16]);
2275 printk(KERN_INFO "ide-tape: %s: invalid tape speed "
2276 "(assuming 650KB/sec)\n", drive->name);
2277 *(u16 *)&caps[14] = 650;
2280 printk(KERN_INFO "ide-tape: %s: invalid max_speed "
2281 "(assuming 650KB/sec)\n", drive->name);
2282 *(u16 *)&caps[8] = 650;
2285 memcpy(&tape->caps, caps, 20);
2287 tape->blk_size = 512;
2288 else if (caps[7] & 0x04)
2289 tape->blk_size = 1024;
2292 #ifdef CONFIG_IDE_PROC_FS
2293 #define ide_tape_devset_get(name, field) \
2294 static int get_##name(ide_drive_t *drive) \
2296 idetape_tape_t *tape = drive->driver_data; \
2297 return tape->field; \
2300 #define ide_tape_devset_set(name, field) \
2301 static int set_##name(ide_drive_t *drive, int arg) \
2303 idetape_tape_t *tape = drive->driver_data; \
2304 tape->field = arg; \
2308 #define ide_tape_devset_rw(_name, _min, _max, _field, _mulf, _divf) \
2309 ide_tape_devset_get(_name, _field) \
2310 ide_tape_devset_set(_name, _field) \
2311 __IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name, _mulf, _divf)
2313 #define ide_tape_devset_r(_name, _min, _max, _field, _mulf, _divf) \
2314 ide_tape_devset_get(_name, _field) \
2315 __IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL, _mulf, _divf)
2317 static int mulf_tdsc(ide_drive_t *drive) { return 1000; }
2318 static int divf_tdsc(ide_drive_t *drive) { return HZ; }
2319 static int divf_buffer(ide_drive_t *drive) { return 2; }
2320 static int divf_buffer_size(ide_drive_t *drive) { return 1024; }
2322 ide_devset_rw(dsc_overlap, 0, 1, dsc_overlap);
2324 ide_tape_devset_rw(debug_mask, 0, 0xffff, debug_mask, NULL, NULL);
2325 ide_tape_devset_rw(tdsc, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX,
2326 best_dsc_rw_freq, mulf_tdsc, divf_tdsc);
2328 ide_tape_devset_r(avg_speed, 0, 0xffff, avg_speed, NULL, NULL);
2329 ide_tape_devset_r(speed, 0, 0xffff, caps[14], NULL, NULL);
2330 ide_tape_devset_r(buffer, 0, 0xffff, caps[16], NULL, divf_buffer);
2331 ide_tape_devset_r(buffer_size, 0, 0xffff, buffer_size, NULL, divf_buffer_size);
2333 static const struct ide_devset *idetape_settings[] = {
2334 &ide_devset_avg_speed,
2336 &ide_devset_buffer_size,
2337 &ide_devset_debug_mask,
2338 &ide_devset_dsc_overlap,
2346 * The function below is called to:
2348 * 1. Initialize our various state variables.
2349 * 2. Ask the tape for its capabilities.
2350 * 3. Allocate a buffer which will be used for data transfer. The buffer size
2351 * is chosen based on the recommendation which we received in step 2.
2353 * Note that at this point ide.c already assigned us an irq, so that we can
2354 * queue requests here and wait for their completion.
2356 static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
2362 u16 *ctl = (u16 *)&tape->caps[12];
2364 drive->pc_callback = ide_tape_callback;
2366 spin_lock_init(&tape->lock);
2367 drive->dsc_overlap = 1;
2368 if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
2369 printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
2371 drive->dsc_overlap = 0;
2373 /* Seagate Travan drives do not support DSC overlap. */
2374 if (strstr((char *)&drive->id[ATA_ID_PROD], "Seagate STT3401"))
2375 drive->dsc_overlap = 0;
2376 tape->minor = minor;
2377 tape->name[0] = 'h';
2378 tape->name[1] = 't';
2379 tape->name[2] = '0' + minor;
2380 tape->chrdev_dir = IDETAPE_DIR_NONE;
2382 *((u16 *)&gcw) = drive->id[ATA_ID_CONFIG];
2384 /* Command packet DRQ type */
2385 if (((gcw[0] & 0x60) >> 5) == 1)
2386 set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
2388 idetape_get_inquiry_results(drive);
2389 idetape_get_mode_sense_results(drive);
2390 ide_tape_get_bsize_from_bdesc(drive);
2391 tape->user_bs_factor = 1;
2392 tape->buffer_size = *ctl * tape->blk_size;
2393 while (tape->buffer_size > 0xffff) {
2394 printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
2396 tape->buffer_size = *ctl * tape->blk_size;
2398 buffer_size = tape->buffer_size;
2399 tape->pages_per_buffer = buffer_size / PAGE_SIZE;
2400 if (buffer_size % PAGE_SIZE) {
2401 tape->pages_per_buffer++;
2402 tape->excess_bh_size = PAGE_SIZE - buffer_size % PAGE_SIZE;
2405 /* select the "best" DSC read/write polling freq */
2406 speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
2408 t = (IDETAPE_FIFO_THRESHOLD * tape->buffer_size * HZ) / (speed * 1000);
2411 * Ensure that the number we got makes sense; limit it within
2412 * IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
2414 tape->best_dsc_rw_freq = clamp_t(unsigned long, t, IDETAPE_DSC_RW_MIN,
2415 IDETAPE_DSC_RW_MAX);
2416 printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
2418 drive->name, tape->name, *(u16 *)&tape->caps[14],
2419 (*(u16 *)&tape->caps[16] * 512) / tape->buffer_size,
2420 tape->buffer_size / 1024,
2421 tape->best_dsc_rw_freq * 1000 / HZ,
2422 drive->using_dma ? ", DMA":"");
2424 ide_proc_register_driver(drive, tape->driver);
2427 static void ide_tape_remove(ide_drive_t *drive)
2429 idetape_tape_t *tape = drive->driver_data;
2431 ide_proc_unregister_driver(drive, tape->driver);
2433 ide_unregister_region(tape->disk);
2438 static void ide_tape_release(struct kref *kref)
2440 struct ide_tape_obj *tape = to_ide_tape(kref);
2441 ide_drive_t *drive = tape->drive;
2442 struct gendisk *g = tape->disk;
2444 BUG_ON(tape->merge_bh_size);
2446 drive->dsc_overlap = 0;
2447 drive->driver_data = NULL;
2448 device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
2449 device_destroy(idetape_sysfs_class,
2450 MKDEV(IDETAPE_MAJOR, tape->minor + 128));
2451 idetape_devs[tape->minor] = NULL;
2452 g->private_data = NULL;
2457 #ifdef CONFIG_IDE_PROC_FS
2458 static int proc_idetape_read_name
2459 (char *page, char **start, off_t off, int count, int *eof, void *data)
2461 ide_drive_t *drive = (ide_drive_t *) data;
2462 idetape_tape_t *tape = drive->driver_data;
2466 len = sprintf(out, "%s\n", tape->name);
2467 PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
2470 static ide_proc_entry_t idetape_proc[] = {
2471 { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
2472 { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
2473 { NULL, 0, NULL, NULL }
2477 static int ide_tape_probe(ide_drive_t *);
2479 static ide_driver_t idetape_driver = {
2481 .owner = THIS_MODULE,
2483 .bus = &ide_bus_type,
2485 .probe = ide_tape_probe,
2486 .remove = ide_tape_remove,
2487 .version = IDETAPE_VERSION,
2489 .do_request = idetape_do_request,
2490 .end_request = idetape_end_request,
2491 .error = __ide_error,
2492 #ifdef CONFIG_IDE_PROC_FS
2493 .proc = idetape_proc,
2494 .settings = idetape_settings,
2498 /* Our character device supporting functions, passed to register_chrdev. */
2499 static const struct file_operations idetape_fops = {
2500 .owner = THIS_MODULE,
2501 .read = idetape_chrdev_read,
2502 .write = idetape_chrdev_write,
2503 .ioctl = idetape_chrdev_ioctl,
2504 .open = idetape_chrdev_open,
2505 .release = idetape_chrdev_release,
2508 static int idetape_open(struct inode *inode, struct file *filp)
2510 struct gendisk *disk = inode->i_bdev->bd_disk;
2511 struct ide_tape_obj *tape;
2513 tape = ide_tape_get(disk);
2520 static int idetape_release(struct inode *inode, struct file *filp)
2522 struct gendisk *disk = inode->i_bdev->bd_disk;
2523 struct ide_tape_obj *tape = ide_tape_g(disk);
2530 static int idetape_ioctl(struct inode *inode, struct file *file,
2531 unsigned int cmd, unsigned long arg)
2533 struct block_device *bdev = inode->i_bdev;
2534 struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
2535 ide_drive_t *drive = tape->drive;
2536 int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2538 err = idetape_blkdev_ioctl(drive, cmd, arg);
2542 static struct block_device_operations idetape_block_ops = {
2543 .owner = THIS_MODULE,
2544 .open = idetape_open,
2545 .release = idetape_release,
2546 .ioctl = idetape_ioctl,
2549 static int ide_tape_probe(ide_drive_t *drive)
2551 idetape_tape_t *tape;
2555 if (!strstr("ide-tape", drive->driver_req))
2558 if (drive->media != ide_tape)
2561 if (drive->id_read == 1 && !ide_check_atapi_device(drive, DRV_NAME)) {
2562 printk(KERN_ERR "ide-tape: %s: not supported by this version of"
2563 " the driver\n", drive->name);
2566 tape = kzalloc(sizeof(idetape_tape_t), GFP_KERNEL);
2568 printk(KERN_ERR "ide-tape: %s: Can't allocate a tape struct\n",
2573 g = alloc_disk(1 << PARTN_BITS);
2577 ide_init_disk(g, drive);
2579 kref_init(&tape->kref);
2581 tape->drive = drive;
2582 tape->driver = &idetape_driver;
2585 g->private_data = &tape->driver;
2587 drive->driver_data = tape;
2589 mutex_lock(&idetape_ref_mutex);
2590 for (minor = 0; idetape_devs[minor]; minor++)
2592 idetape_devs[minor] = tape;
2593 mutex_unlock(&idetape_ref_mutex);
2595 idetape_setup(drive, tape, minor);
2597 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2598 MKDEV(IDETAPE_MAJOR, minor), NULL,
2600 device_create_drvdata(idetape_sysfs_class, &drive->gendev,
2601 MKDEV(IDETAPE_MAJOR, minor + 128), NULL,
2604 g->fops = &idetape_block_ops;
2605 ide_register_region(g);
2615 static void __exit idetape_exit(void)
2617 driver_unregister(&idetape_driver.gen_driver);
2618 class_destroy(idetape_sysfs_class);
2619 unregister_chrdev(IDETAPE_MAJOR, "ht");
2622 static int __init idetape_init(void)
2625 idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
2626 if (IS_ERR(idetape_sysfs_class)) {
2627 idetape_sysfs_class = NULL;
2628 printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
2633 if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
2634 printk(KERN_ERR "ide-tape: Failed to register chrdev"
2637 goto out_free_class;
2640 error = driver_register(&idetape_driver.gen_driver);
2642 goto out_free_driver;
2647 driver_unregister(&idetape_driver.gen_driver);
2649 class_destroy(idetape_sysfs_class);
2654 MODULE_ALIAS("ide:*m-tape*");
2655 module_init(idetape_init);
2656 module_exit(idetape_exit);
2657 MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
2658 MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
2659 MODULE_LICENSE("GPL");